* [PATCH v6 01/20] Docs: dt: add PCI IOMMU map bindings
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA, Mark Rutland
From: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>
The existing IOMMU bindings are able to specify the relationship between
masters and IOMMUs, but they are insufficient for describing the general
case of hotpluggable busses such as PCI where the set of masters is not
known until runtime, and the relationship between masters and IOMMUs is
a property of the integration of the system.
This patch adds a generic binding for mapping PCI devices to IOMMUs,
using a new iommu-map property (specific to PCI*) which may be used to
map devices (identified by their Requester ID) to sideband data for the
IOMMU which they master through.
Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Acked-by: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
Signed-off-by: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>
---
.../devicetree/bindings/pci/pci-iommu.txt | 171 +++++++++++++++++++++
1 file changed, 171 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/pci-iommu.txt
diff --git a/Documentation/devicetree/bindings/pci/pci-iommu.txt b/Documentation/devicetree/bindings/pci/pci-iommu.txt
new file mode 100644
index 000000000000..56c829621b9a
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/pci-iommu.txt
@@ -0,0 +1,171 @@
+This document describes the generic device tree binding for describing the
+relationship between PCI(e) devices and IOMMU(s).
+
+Each PCI(e) device under a root complex is uniquely identified by its Requester
+ID (AKA RID). A Requester ID is a triplet of a Bus number, Device number, and
+Function number.
+
+For the purpose of this document, when treated as a numeric value, a RID is
+formatted such that:
+
+* Bits [15:8] are the Bus number.
+* Bits [7:3] are the Device number.
+* Bits [2:0] are the Function number.
+* Any other bits required for padding must be zero.
+
+IOMMUs may distinguish PCI devices through sideband data derived from the
+Requester ID. While a given PCI device can only master through one IOMMU, a
+root complex may split masters across a set of IOMMUs (e.g. with one IOMMU per
+bus).
+
+The generic 'iommus' property is insufficient to describe this relationship,
+and a mechanism is required to map from a PCI device to its IOMMU and sideband
+data.
+
+For generic IOMMU bindings, see
+Documentation/devicetree/bindings/iommu/iommu.txt.
+
+
+PCI root complex
+================
+
+Optional properties
+-------------------
+
+- iommu-map: Maps a Requester ID to an IOMMU and associated iommu-specifier
+ data.
+
+ The property is an arbitrary number of tuples of
+ (rid-base,iommu,iommu-base,length).
+
+ Any RID r in the interval [rid-base, rid-base + length) is associated with
+ the listed IOMMU, with the iommu-specifier (r - rid-base + iommu-base).
+
+- iommu-map-mask: A mask to be applied to each Requester ID prior to being
+ mapped to an iommu-specifier per the iommu-map property.
+
+
+Example (1)
+===========
+
+/ {
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ iommu: iommu@a {
+ reg = <0xa 0x1>;
+ compatible = "vendor,some-iommu";
+ #iommu-cells = <1>;
+ };
+
+ pci: pci@f {
+ reg = <0xf 0x1>;
+ compatible = "vendor,pcie-root-complex";
+ device_type = "pci";
+
+ /*
+ * The sideband data provided to the IOMMU is the RID,
+ * identity-mapped.
+ */
+ iommu-map = <0x0 &iommu 0x0 0x10000>;
+ };
+};
+
+
+Example (2)
+===========
+
+/ {
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ iommu: iommu@a {
+ reg = <0xa 0x1>;
+ compatible = "vendor,some-iommu";
+ #iommu-cells = <1>;
+ };
+
+ pci: pci@f {
+ reg = <0xf 0x1>;
+ compatible = "vendor,pcie-root-complex";
+ device_type = "pci";
+
+ /*
+ * The sideband data provided to the IOMMU is the RID with the
+ * function bits masked out.
+ */
+ iommu-map = <0x0 &iommu 0x0 0x10000>;
+ iommu-map-mask = <0xfff8>;
+ };
+};
+
+
+Example (3)
+===========
+
+/ {
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ iommu: iommu@a {
+ reg = <0xa 0x1>;
+ compatible = "vendor,some-iommu";
+ #iommu-cells = <1>;
+ };
+
+ pci: pci@f {
+ reg = <0xf 0x1>;
+ compatible = "vendor,pcie-root-complex";
+ device_type = "pci";
+
+ /*
+ * The sideband data provided to the IOMMU is the RID,
+ * but the high bits of the bus number are flipped.
+ */
+ iommu-map = <0x0000 &iommu 0x8000 0x8000>,
+ <0x8000 &iommu 0x0000 0x8000>;
+ };
+};
+
+
+Example (4)
+===========
+
+/ {
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ iommu_a: iommu@a {
+ reg = <0xa 0x1>;
+ compatible = "vendor,some-iommu";
+ #iommu-cells = <1>;
+ };
+
+ iommu_b: iommu@b {
+ reg = <0xb 0x1>;
+ compatible = "vendor,some-iommu";
+ #iommu-cells = <1>;
+ };
+
+ iommu_c: iommu@c {
+ reg = <0xc 0x1>;
+ compatible = "vendor,some-iommu";
+ #iommu-cells = <1>;
+ };
+
+ pci: pci@f {
+ reg = <0xf 0x1>;
+ compatible = "vendor,pcie-root-complex";
+ device_type = "pci";
+
+ /*
+ * Devices with bus number 0-127 are mastered via IOMMU
+ * a, with sideband data being RID[14:0].
+ * Devices with bus number 128-255 are mastered via
+ * IOMMU b, with sideband data being RID[14:0].
+ * No devices master via IOMMU c.
+ */
+ iommu-map = <0x0000 &iommu_a 0x0000 0x8000>,
+ <0x8000 &iommu_b 0x0000 0x8000>;
+ };
+};
--
2.8.1.dirty
--
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^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 01/20] Docs: dt: add PCI IOMMU map bindings
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
From: Mark Rutland <mark.rutland@arm.com>
The existing IOMMU bindings are able to specify the relationship between
masters and IOMMUs, but they are insufficient for describing the general
case of hotpluggable busses such as PCI where the set of masters is not
known until runtime, and the relationship between masters and IOMMUs is
a property of the integration of the system.
This patch adds a generic binding for mapping PCI devices to IOMMUs,
using a new iommu-map property (specific to PCI*) which may be used to
map devices (identified by their Requester ID) to sideband data for the
IOMMU which they master through.
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
---
.../devicetree/bindings/pci/pci-iommu.txt | 171 +++++++++++++++++++++
1 file changed, 171 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/pci-iommu.txt
diff --git a/Documentation/devicetree/bindings/pci/pci-iommu.txt b/Documentation/devicetree/bindings/pci/pci-iommu.txt
new file mode 100644
index 000000000000..56c829621b9a
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/pci-iommu.txt
@@ -0,0 +1,171 @@
+This document describes the generic device tree binding for describing the
+relationship between PCI(e) devices and IOMMU(s).
+
+Each PCI(e) device under a root complex is uniquely identified by its Requester
+ID (AKA RID). A Requester ID is a triplet of a Bus number, Device number, and
+Function number.
+
+For the purpose of this document, when treated as a numeric value, a RID is
+formatted such that:
+
+* Bits [15:8] are the Bus number.
+* Bits [7:3] are the Device number.
+* Bits [2:0] are the Function number.
+* Any other bits required for padding must be zero.
+
+IOMMUs may distinguish PCI devices through sideband data derived from the
+Requester ID. While a given PCI device can only master through one IOMMU, a
+root complex may split masters across a set of IOMMUs (e.g. with one IOMMU per
+bus).
+
+The generic 'iommus' property is insufficient to describe this relationship,
+and a mechanism is required to map from a PCI device to its IOMMU and sideband
+data.
+
+For generic IOMMU bindings, see
+Documentation/devicetree/bindings/iommu/iommu.txt.
+
+
+PCI root complex
+================
+
+Optional properties
+-------------------
+
+- iommu-map: Maps a Requester ID to an IOMMU and associated iommu-specifier
+ data.
+
+ The property is an arbitrary number of tuples of
+ (rid-base,iommu,iommu-base,length).
+
+ Any RID r in the interval [rid-base, rid-base + length) is associated with
+ the listed IOMMU, with the iommu-specifier (r - rid-base + iommu-base).
+
+- iommu-map-mask: A mask to be applied to each Requester ID prior to being
+ mapped to an iommu-specifier per the iommu-map property.
+
+
+Example (1)
+===========
+
+/ {
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ iommu: iommu at a {
+ reg = <0xa 0x1>;
+ compatible = "vendor,some-iommu";
+ #iommu-cells = <1>;
+ };
+
+ pci: pci at f {
+ reg = <0xf 0x1>;
+ compatible = "vendor,pcie-root-complex";
+ device_type = "pci";
+
+ /*
+ * The sideband data provided to the IOMMU is the RID,
+ * identity-mapped.
+ */
+ iommu-map = <0x0 &iommu 0x0 0x10000>;
+ };
+};
+
+
+Example (2)
+===========
+
+/ {
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ iommu: iommu at a {
+ reg = <0xa 0x1>;
+ compatible = "vendor,some-iommu";
+ #iommu-cells = <1>;
+ };
+
+ pci: pci at f {
+ reg = <0xf 0x1>;
+ compatible = "vendor,pcie-root-complex";
+ device_type = "pci";
+
+ /*
+ * The sideband data provided to the IOMMU is the RID with the
+ * function bits masked out.
+ */
+ iommu-map = <0x0 &iommu 0x0 0x10000>;
+ iommu-map-mask = <0xfff8>;
+ };
+};
+
+
+Example (3)
+===========
+
+/ {
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ iommu: iommu at a {
+ reg = <0xa 0x1>;
+ compatible = "vendor,some-iommu";
+ #iommu-cells = <1>;
+ };
+
+ pci: pci at f {
+ reg = <0xf 0x1>;
+ compatible = "vendor,pcie-root-complex";
+ device_type = "pci";
+
+ /*
+ * The sideband data provided to the IOMMU is the RID,
+ * but the high bits of the bus number are flipped.
+ */
+ iommu-map = <0x0000 &iommu 0x8000 0x8000>,
+ <0x8000 &iommu 0x0000 0x8000>;
+ };
+};
+
+
+Example (4)
+===========
+
+/ {
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ iommu_a: iommu at a {
+ reg = <0xa 0x1>;
+ compatible = "vendor,some-iommu";
+ #iommu-cells = <1>;
+ };
+
+ iommu_b: iommu at b {
+ reg = <0xb 0x1>;
+ compatible = "vendor,some-iommu";
+ #iommu-cells = <1>;
+ };
+
+ iommu_c: iommu at c {
+ reg = <0xc 0x1>;
+ compatible = "vendor,some-iommu";
+ #iommu-cells = <1>;
+ };
+
+ pci: pci at f {
+ reg = <0xf 0x1>;
+ compatible = "vendor,pcie-root-complex";
+ device_type = "pci";
+
+ /*
+ * Devices with bus number 0-127 are mastered via IOMMU
+ * a, with sideband data being RID[14:0].
+ * Devices with bus number 128-255 are mastered via
+ * IOMMU b, with sideband data being RID[14:0].
+ * No devices master via IOMMU c.
+ */
+ iommu-map = <0x0000 &iommu_a 0x0000 0x8000>,
+ <0x8000 &iommu_b 0x0000 0x8000>;
+ };
+};
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 02/20] of/irq: Break out msi-map lookup (again)
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
The PCI msi-map code is already doing double-duty translating IDs and
retrieving MSI parents, which unsurprisingly is the same functionality
we need for the identically-formatted PCI iommu-map property. Drag the
core parsing routine up yet another layer into the general OF-PCI code,
and further generalise it for either kind of lookup in either flavour
of map property.
Acked-by: Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Acked-by: Marc Zyngier <marc.zyngier-5wv7dgnIgG8@public.gmane.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
drivers/of/irq.c | 78 ++-----------------------------------
drivers/of/of_pci.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/of_pci.h | 10 +++++
3 files changed, 116 insertions(+), 74 deletions(-)
diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index a2e68f740eda..393fea85eb4e 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -26,6 +26,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
+#include <linux/of_pci.h>
#include <linux/string.h>
#include <linux/slab.h>
@@ -592,87 +593,16 @@ static u32 __of_msi_map_rid(struct device *dev, struct device_node **np,
u32 rid_in)
{
struct device *parent_dev;
- struct device_node *msi_controller_node;
- struct device_node *msi_np = *np;
- u32 map_mask, masked_rid, rid_base, msi_base, rid_len, phandle;
- int msi_map_len;
- bool matched;
u32 rid_out = rid_in;
- const __be32 *msi_map = NULL;
/*
* Walk up the device parent links looking for one with a
* "msi-map" property.
*/
- for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent) {
- if (!parent_dev->of_node)
- continue;
-
- msi_map = of_get_property(parent_dev->of_node,
- "msi-map", &msi_map_len);
- if (!msi_map)
- continue;
-
- if (msi_map_len % (4 * sizeof(__be32))) {
- dev_err(parent_dev, "Error: Bad msi-map length: %d\n",
- msi_map_len);
- return rid_out;
- }
- /* We have a good parent_dev and msi_map, let's use them. */
- break;
- }
- if (!msi_map)
- return rid_out;
-
- /* The default is to select all bits. */
- map_mask = 0xffffffff;
-
- /*
- * Can be overridden by "msi-map-mask" property. If
- * of_property_read_u32() fails, the default is used.
- */
- of_property_read_u32(parent_dev->of_node, "msi-map-mask", &map_mask);
-
- masked_rid = map_mask & rid_in;
- matched = false;
- while (!matched && msi_map_len >= 4 * sizeof(__be32)) {
- rid_base = be32_to_cpup(msi_map + 0);
- phandle = be32_to_cpup(msi_map + 1);
- msi_base = be32_to_cpup(msi_map + 2);
- rid_len = be32_to_cpup(msi_map + 3);
-
- if (rid_base & ~map_mask) {
- dev_err(parent_dev,
- "Invalid msi-map translation - msi-map-mask (0x%x) ignores rid-base (0x%x)\n",
- map_mask, rid_base);
- return rid_out;
- }
-
- msi_controller_node = of_find_node_by_phandle(phandle);
-
- matched = (masked_rid >= rid_base &&
- masked_rid < rid_base + rid_len);
- if (msi_np)
- matched &= msi_np == msi_controller_node;
-
- if (matched && !msi_np) {
- *np = msi_np = msi_controller_node;
+ for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent)
+ if (!of_pci_map_rid(parent_dev->of_node, rid_in, "msi-map",
+ "msi-map-mask", np, &rid_out))
break;
- }
-
- of_node_put(msi_controller_node);
- msi_map_len -= 4 * sizeof(__be32);
- msi_map += 4;
- }
- if (!matched)
- return rid_out;
-
- rid_out = masked_rid - rid_base + msi_base;
- dev_dbg(dev,
- "msi-map at: %s, using mask %08x, rid-base: %08x, msi-base: %08x, length: %08x, rid: %08x -> %08x\n",
- dev_name(parent_dev), map_mask, rid_base, msi_base,
- rid_len, rid_in, rid_out);
-
return rid_out;
}
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 589b30c68e14..b58be12ab277 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -308,3 +308,105 @@ struct msi_controller *of_pci_find_msi_chip_by_node(struct device_node *of_node)
EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node);
#endif /* CONFIG_PCI_MSI */
+
+/**
+ * of_pci_map_rid - Translate a requester ID through a downstream mapping.
+ * @np: root complex device node.
+ * @rid: PCI requester ID to map.
+ * @map_name: property name of the map to use.
+ * @map_mask_name: optional property name of the mask to use.
+ * @target: optional pointer to a target device node.
+ * @id_out: optional pointer to receive the translated ID.
+ *
+ * Given a PCI requester ID, look up the appropriate implementation-defined
+ * platform ID and/or the target device which receives transactions on that
+ * ID, as per the "iommu-map" and "msi-map" bindings. Either of @target or
+ * @id_out may be NULL if only the other is required. If @target points to
+ * a non-NULL device node pointer, only entries targeting that node will be
+ * matched; if it points to a NULL value, it will receive the device node of
+ * the first matching target phandle, with a reference held.
+ *
+ * Return: 0 on success or a standard error code on failure.
+ */
+int of_pci_map_rid(struct device_node *np, u32 rid,
+ const char *map_name, const char *map_mask_name,
+ struct device_node **target, u32 *id_out)
+{
+ u32 map_mask, masked_rid;
+ int map_len;
+ const __be32 *map = NULL;
+
+ if (!np || !map_name || (!target && !id_out))
+ return -EINVAL;
+
+ map = of_get_property(np, map_name, &map_len);
+ if (!map) {
+ if (target)
+ return -ENODEV;
+ /* Otherwise, no map implies no translation */
+ *id_out = rid;
+ return 0;
+ }
+
+ if (!map_len || map_len % (4 * sizeof(*map))) {
+ pr_err("%s: Error: Bad %s length: %d\n", np->full_name,
+ map_name, map_len);
+ return -EINVAL;
+ }
+
+ /* The default is to select all bits. */
+ map_mask = 0xffffffff;
+
+ /*
+ * Can be overridden by "{iommu,msi}-map-mask" property.
+ * If of_property_read_u32() fails, the default is used.
+ */
+ if (map_mask_name)
+ of_property_read_u32(np, map_mask_name, &map_mask);
+
+ masked_rid = map_mask & rid;
+ for ( ; map_len > 0; map_len -= 4 * sizeof(*map), map += 4) {
+ struct device_node *phandle_node;
+ u32 rid_base = be32_to_cpup(map + 0);
+ u32 phandle = be32_to_cpup(map + 1);
+ u32 out_base = be32_to_cpup(map + 2);
+ u32 rid_len = be32_to_cpup(map + 3);
+
+ if (rid_base & ~map_mask) {
+ pr_err("%s: Invalid %s translation - %s-mask (0x%x) ignores rid-base (0x%x)\n",
+ np->full_name, map_name, map_name,
+ map_mask, rid_base);
+ return -EFAULT;
+ }
+
+ if (masked_rid < rid_base || masked_rid >= rid_base + rid_len)
+ continue;
+
+ phandle_node = of_find_node_by_phandle(phandle);
+ if (!phandle_node)
+ return -ENODEV;
+
+ if (target) {
+ if (*target)
+ of_node_put(phandle_node);
+ else
+ *target = phandle_node;
+
+ if (*target != phandle_node)
+ continue;
+ }
+
+ if (id_out)
+ *id_out = masked_rid - rid_base + out_base;
+
+ pr_debug("%s: %s, using mask %08x, rid-base: %08x, out-base: %08x, length: %08x, rid: %08x -> %08x\n",
+ np->full_name, map_name, map_mask, rid_base, out_base,
+ rid_len, rid, *id_out);
+ return 0;
+ }
+
+ pr_err("%s: Invalid %s translation - no match for rid 0x%x on %s\n",
+ np->full_name, map_name, rid,
+ target && *target ? (*target)->full_name : "any target");
+ return -EFAULT;
+}
diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
index b969e9443962..7fd5cfce9140 100644
--- a/include/linux/of_pci.h
+++ b/include/linux/of_pci.h
@@ -17,6 +17,9 @@ int of_irq_parse_and_map_pci(const struct pci_dev *dev, u8 slot, u8 pin);
int of_pci_parse_bus_range(struct device_node *node, struct resource *res);
int of_get_pci_domain_nr(struct device_node *node);
void of_pci_check_probe_only(void);
+int of_pci_map_rid(struct device_node *np, u32 rid,
+ const char *map_name, const char *map_mask_name,
+ struct device_node **target, u32 *id_out);
#else
static inline int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq)
{
@@ -52,6 +55,13 @@ of_get_pci_domain_nr(struct device_node *node)
return -1;
}
+static inline int of_pci_map_rid(struct device_node *np, u32 rid,
+ const char *map_name, const char *map_mask_name,
+ struct device_node **target, u32 *id_out)
+{
+ return -EINVAL;
+}
+
static inline void of_pci_check_probe_only(void) { }
#endif
--
2.8.1.dirty
--
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^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 02/20] of/irq: Break out msi-map lookup (again)
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
The PCI msi-map code is already doing double-duty translating IDs and
retrieving MSI parents, which unsurprisingly is the same functionality
we need for the identically-formatted PCI iommu-map property. Drag the
core parsing routine up yet another layer into the general OF-PCI code,
and further generalise it for either kind of lookup in either flavour
of map property.
Acked-by: Rob Herring <robh+dt@kernel.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/of/irq.c | 78 ++-----------------------------------
drivers/of/of_pci.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/of_pci.h | 10 +++++
3 files changed, 116 insertions(+), 74 deletions(-)
diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index a2e68f740eda..393fea85eb4e 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -26,6 +26,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
+#include <linux/of_pci.h>
#include <linux/string.h>
#include <linux/slab.h>
@@ -592,87 +593,16 @@ static u32 __of_msi_map_rid(struct device *dev, struct device_node **np,
u32 rid_in)
{
struct device *parent_dev;
- struct device_node *msi_controller_node;
- struct device_node *msi_np = *np;
- u32 map_mask, masked_rid, rid_base, msi_base, rid_len, phandle;
- int msi_map_len;
- bool matched;
u32 rid_out = rid_in;
- const __be32 *msi_map = NULL;
/*
* Walk up the device parent links looking for one with a
* "msi-map" property.
*/
- for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent) {
- if (!parent_dev->of_node)
- continue;
-
- msi_map = of_get_property(parent_dev->of_node,
- "msi-map", &msi_map_len);
- if (!msi_map)
- continue;
-
- if (msi_map_len % (4 * sizeof(__be32))) {
- dev_err(parent_dev, "Error: Bad msi-map length: %d\n",
- msi_map_len);
- return rid_out;
- }
- /* We have a good parent_dev and msi_map, let's use them. */
- break;
- }
- if (!msi_map)
- return rid_out;
-
- /* The default is to select all bits. */
- map_mask = 0xffffffff;
-
- /*
- * Can be overridden by "msi-map-mask" property. If
- * of_property_read_u32() fails, the default is used.
- */
- of_property_read_u32(parent_dev->of_node, "msi-map-mask", &map_mask);
-
- masked_rid = map_mask & rid_in;
- matched = false;
- while (!matched && msi_map_len >= 4 * sizeof(__be32)) {
- rid_base = be32_to_cpup(msi_map + 0);
- phandle = be32_to_cpup(msi_map + 1);
- msi_base = be32_to_cpup(msi_map + 2);
- rid_len = be32_to_cpup(msi_map + 3);
-
- if (rid_base & ~map_mask) {
- dev_err(parent_dev,
- "Invalid msi-map translation - msi-map-mask (0x%x) ignores rid-base (0x%x)\n",
- map_mask, rid_base);
- return rid_out;
- }
-
- msi_controller_node = of_find_node_by_phandle(phandle);
-
- matched = (masked_rid >= rid_base &&
- masked_rid < rid_base + rid_len);
- if (msi_np)
- matched &= msi_np == msi_controller_node;
-
- if (matched && !msi_np) {
- *np = msi_np = msi_controller_node;
+ for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent)
+ if (!of_pci_map_rid(parent_dev->of_node, rid_in, "msi-map",
+ "msi-map-mask", np, &rid_out))
break;
- }
-
- of_node_put(msi_controller_node);
- msi_map_len -= 4 * sizeof(__be32);
- msi_map += 4;
- }
- if (!matched)
- return rid_out;
-
- rid_out = masked_rid - rid_base + msi_base;
- dev_dbg(dev,
- "msi-map at: %s, using mask %08x, rid-base: %08x, msi-base: %08x, length: %08x, rid: %08x -> %08x\n",
- dev_name(parent_dev), map_mask, rid_base, msi_base,
- rid_len, rid_in, rid_out);
-
return rid_out;
}
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 589b30c68e14..b58be12ab277 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -308,3 +308,105 @@ struct msi_controller *of_pci_find_msi_chip_by_node(struct device_node *of_node)
EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node);
#endif /* CONFIG_PCI_MSI */
+
+/**
+ * of_pci_map_rid - Translate a requester ID through a downstream mapping.
+ * @np: root complex device node.
+ * @rid: PCI requester ID to map.
+ * @map_name: property name of the map to use.
+ * @map_mask_name: optional property name of the mask to use.
+ * @target: optional pointer to a target device node.
+ * @id_out: optional pointer to receive the translated ID.
+ *
+ * Given a PCI requester ID, look up the appropriate implementation-defined
+ * platform ID and/or the target device which receives transactions on that
+ * ID, as per the "iommu-map" and "msi-map" bindings. Either of @target or
+ * @id_out may be NULL if only the other is required. If @target points to
+ * a non-NULL device node pointer, only entries targeting that node will be
+ * matched; if it points to a NULL value, it will receive the device node of
+ * the first matching target phandle, with a reference held.
+ *
+ * Return: 0 on success or a standard error code on failure.
+ */
+int of_pci_map_rid(struct device_node *np, u32 rid,
+ const char *map_name, const char *map_mask_name,
+ struct device_node **target, u32 *id_out)
+{
+ u32 map_mask, masked_rid;
+ int map_len;
+ const __be32 *map = NULL;
+
+ if (!np || !map_name || (!target && !id_out))
+ return -EINVAL;
+
+ map = of_get_property(np, map_name, &map_len);
+ if (!map) {
+ if (target)
+ return -ENODEV;
+ /* Otherwise, no map implies no translation */
+ *id_out = rid;
+ return 0;
+ }
+
+ if (!map_len || map_len % (4 * sizeof(*map))) {
+ pr_err("%s: Error: Bad %s length: %d\n", np->full_name,
+ map_name, map_len);
+ return -EINVAL;
+ }
+
+ /* The default is to select all bits. */
+ map_mask = 0xffffffff;
+
+ /*
+ * Can be overridden by "{iommu,msi}-map-mask" property.
+ * If of_property_read_u32() fails, the default is used.
+ */
+ if (map_mask_name)
+ of_property_read_u32(np, map_mask_name, &map_mask);
+
+ masked_rid = map_mask & rid;
+ for ( ; map_len > 0; map_len -= 4 * sizeof(*map), map += 4) {
+ struct device_node *phandle_node;
+ u32 rid_base = be32_to_cpup(map + 0);
+ u32 phandle = be32_to_cpup(map + 1);
+ u32 out_base = be32_to_cpup(map + 2);
+ u32 rid_len = be32_to_cpup(map + 3);
+
+ if (rid_base & ~map_mask) {
+ pr_err("%s: Invalid %s translation - %s-mask (0x%x) ignores rid-base (0x%x)\n",
+ np->full_name, map_name, map_name,
+ map_mask, rid_base);
+ return -EFAULT;
+ }
+
+ if (masked_rid < rid_base || masked_rid >= rid_base + rid_len)
+ continue;
+
+ phandle_node = of_find_node_by_phandle(phandle);
+ if (!phandle_node)
+ return -ENODEV;
+
+ if (target) {
+ if (*target)
+ of_node_put(phandle_node);
+ else
+ *target = phandle_node;
+
+ if (*target != phandle_node)
+ continue;
+ }
+
+ if (id_out)
+ *id_out = masked_rid - rid_base + out_base;
+
+ pr_debug("%s: %s, using mask %08x, rid-base: %08x, out-base: %08x, length: %08x, rid: %08x -> %08x\n",
+ np->full_name, map_name, map_mask, rid_base, out_base,
+ rid_len, rid, *id_out);
+ return 0;
+ }
+
+ pr_err("%s: Invalid %s translation - no match for rid 0x%x on %s\n",
+ np->full_name, map_name, rid,
+ target && *target ? (*target)->full_name : "any target");
+ return -EFAULT;
+}
diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
index b969e9443962..7fd5cfce9140 100644
--- a/include/linux/of_pci.h
+++ b/include/linux/of_pci.h
@@ -17,6 +17,9 @@ int of_irq_parse_and_map_pci(const struct pci_dev *dev, u8 slot, u8 pin);
int of_pci_parse_bus_range(struct device_node *node, struct resource *res);
int of_get_pci_domain_nr(struct device_node *node);
void of_pci_check_probe_only(void);
+int of_pci_map_rid(struct device_node *np, u32 rid,
+ const char *map_name, const char *map_mask_name,
+ struct device_node **target, u32 *id_out);
#else
static inline int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq)
{
@@ -52,6 +55,13 @@ of_get_pci_domain_nr(struct device_node *node)
return -1;
}
+static inline int of_pci_map_rid(struct device_node *np, u32 rid,
+ const char *map_name, const char *map_mask_name,
+ struct device_node **target, u32 *id_out)
+{
+ return -EINVAL;
+}
+
static inline void of_pci_check_probe_only(void) { }
#endif
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 03/20] iommu/of: Handle iommu-map property for PCI
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA
Now that we have a way to pick up the RID translation and target IOMMU,
hook up of_iommu_configure() to bring PCI devices into the of_xlate
mechanism and allow them IOMMU-backed DMA ops without the need for
driver-specific handling.
Reviewed-by: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
- Split PCI handling into a separate function
---
drivers/iommu/of_iommu.c | 46 +++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 41 insertions(+), 5 deletions(-)
diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 57f23eaaa2f9..19e1e8f2f871 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -22,6 +22,7 @@
#include <linux/limits.h>
#include <linux/of.h>
#include <linux/of_iommu.h>
+#include <linux/of_pci.h>
#include <linux/slab.h>
static const struct of_device_id __iommu_of_table_sentinel
@@ -134,6 +135,45 @@ const struct iommu_ops *of_iommu_get_ops(struct device_node *np)
return ops;
}
+static int __get_pci_rid(struct pci_dev *pdev, u16 alias, void *data)
+{
+ struct of_phandle_args *iommu_spec = data;
+
+ iommu_spec->args[0] = alias;
+ return iommu_spec->np == pdev->bus->dev.of_node;
+}
+
+static const struct iommu_ops
+*of_pci_iommu_configure(struct pci_dev *pdev, struct device_node *bridge_np)
+{
+ const struct iommu_ops *ops;
+ struct of_phandle_args iommu_spec;
+
+ /*
+ * Start by tracing the RID alias down the PCI topology as
+ * far as the host bridge whose OF node we have...
+ * (we're not even attempting to handle multi-alias devices yet)
+ */
+ iommu_spec.args_count = 1;
+ iommu_spec.np = bridge_np;
+ pci_for_each_dma_alias(pdev, __get_pci_rid, &iommu_spec);
+ /*
+ * ...then find out what that becomes once it escapes the PCI
+ * bus into the system beyond, and which IOMMU it ends up at.
+ */
+ iommu_spec.np = NULL;
+ if (of_pci_map_rid(bridge_np, iommu_spec.args[0], "iommu-map",
+ "iommu-map-mask", &iommu_spec.np, iommu_spec.args))
+ return NULL;
+
+ ops = of_iommu_get_ops(iommu_spec.np);
+ if (!ops || !ops->of_xlate || ops->of_xlate(&pdev->dev, &iommu_spec))
+ ops = NULL;
+
+ of_node_put(iommu_spec.np);
+ return ops;
+}
+
const struct iommu_ops *of_iommu_configure(struct device *dev,
struct device_node *master_np)
{
@@ -142,12 +182,8 @@ const struct iommu_ops *of_iommu_configure(struct device *dev,
const struct iommu_ops *ops = NULL;
int idx = 0;
- /*
- * We can't do much for PCI devices without knowing how
- * device IDs are wired up from the PCI bus to the IOMMU.
- */
if (dev_is_pci(dev))
- return NULL;
+ return of_pci_iommu_configure(to_pci_dev(dev), master_np);
/*
* We don't currently walk up the tree looking for a parent IOMMU.
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 03/20] iommu/of: Handle iommu-map property for PCI
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
Now that we have a way to pick up the RID translation and target IOMMU,
hook up of_iommu_configure() to bring PCI devices into the of_xlate
mechanism and allow them IOMMU-backed DMA ops without the need for
driver-specific handling.
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
- Split PCI handling into a separate function
---
drivers/iommu/of_iommu.c | 46 +++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 41 insertions(+), 5 deletions(-)
diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 57f23eaaa2f9..19e1e8f2f871 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -22,6 +22,7 @@
#include <linux/limits.h>
#include <linux/of.h>
#include <linux/of_iommu.h>
+#include <linux/of_pci.h>
#include <linux/slab.h>
static const struct of_device_id __iommu_of_table_sentinel
@@ -134,6 +135,45 @@ const struct iommu_ops *of_iommu_get_ops(struct device_node *np)
return ops;
}
+static int __get_pci_rid(struct pci_dev *pdev, u16 alias, void *data)
+{
+ struct of_phandle_args *iommu_spec = data;
+
+ iommu_spec->args[0] = alias;
+ return iommu_spec->np == pdev->bus->dev.of_node;
+}
+
+static const struct iommu_ops
+*of_pci_iommu_configure(struct pci_dev *pdev, struct device_node *bridge_np)
+{
+ const struct iommu_ops *ops;
+ struct of_phandle_args iommu_spec;
+
+ /*
+ * Start by tracing the RID alias down the PCI topology as
+ * far as the host bridge whose OF node we have...
+ * (we're not even attempting to handle multi-alias devices yet)
+ */
+ iommu_spec.args_count = 1;
+ iommu_spec.np = bridge_np;
+ pci_for_each_dma_alias(pdev, __get_pci_rid, &iommu_spec);
+ /*
+ * ...then find out what that becomes once it escapes the PCI
+ * bus into the system beyond, and which IOMMU it ends up at.
+ */
+ iommu_spec.np = NULL;
+ if (of_pci_map_rid(bridge_np, iommu_spec.args[0], "iommu-map",
+ "iommu-map-mask", &iommu_spec.np, iommu_spec.args))
+ return NULL;
+
+ ops = of_iommu_get_ops(iommu_spec.np);
+ if (!ops || !ops->of_xlate || ops->of_xlate(&pdev->dev, &iommu_spec))
+ ops = NULL;
+
+ of_node_put(iommu_spec.np);
+ return ops;
+}
+
const struct iommu_ops *of_iommu_configure(struct device *dev,
struct device_node *master_np)
{
@@ -142,12 +182,8 @@ const struct iommu_ops *of_iommu_configure(struct device *dev,
const struct iommu_ops *ops = NULL;
int idx = 0;
- /*
- * We can't do much for PCI devices without knowing how
- * device IDs are wired up from the PCI bus to the IOMMU.
- */
if (dev_is_pci(dev))
- return NULL;
+ return of_pci_iommu_configure(to_pci_dev(dev), master_np);
/*
* We don't currently walk up the tree looking for a parent IOMMU.
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 04/20] iommu/of: Introduce iommu_fwspec
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
Introduce a common structure to hold the per-device firmware data that
non-architectural IOMMU drivers generally need to keep track of.
Initially this is DT-specific to complement the existing of_iommu
support code, but will generalise further once other firmware methods
(e.g. ACPI IORT) come along.
Ultimately the aim is to promote the fwspec to a first-class member of
struct device, and handle the init/free automatically in the firmware
code. That way we can have API calls look for dev->fwspec->iommu_ops
before falling back to dev->bus->iommu_ops, and thus gracefully handle
those troublesome multi-IOMMU systems which we currently cannot. To
start with, though, make use of the existing archdata field and delegate
the init/free to drivers to allow an incremental conversion rather than
the impractical pain of trying to attempt everything in one go.
Suggested-by: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
- Replace crazy while loop with sane code
---
drivers/iommu/of_iommu.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/of_iommu.h | 15 ++++++++++++++
2 files changed, 69 insertions(+)
diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 19e1e8f2f871..04d616daffa3 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -226,3 +226,57 @@ static int __init of_iommu_init(void)
return 0;
}
postcore_initcall_sync(of_iommu_init);
+
+int iommu_fwspec_init(struct device *dev, struct device_node *iommu_np)
+{
+ struct iommu_fwspec *fwspec = dev->archdata.iommu;
+
+ if (fwspec)
+ return 0;
+
+ fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL);
+ if (!fwspec)
+ return -ENOMEM;
+
+ fwspec->iommu_np = of_node_get(iommu_np);
+ fwspec->iommu_ops = of_iommu_get_ops(iommu_np);
+ dev->archdata.iommu = fwspec;
+ return 0;
+}
+
+void iommu_fwspec_free(struct device *dev)
+{
+ struct iommu_fwspec *fwspec = dev->archdata.iommu;
+
+ if (fwspec) {
+ of_node_put(fwspec->iommu_np);
+ kfree(fwspec);
+ }
+}
+
+int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids)
+{
+ struct iommu_fwspec *fwspec = dev->archdata.iommu;
+ size_t size;
+ int i;
+
+ if (!fwspec)
+ return -EINVAL;
+
+ size = offsetof(struct iommu_fwspec, ids[fwspec->num_ids + num_ids]);
+ fwspec = krealloc(dev->archdata.iommu, size, GFP_KERNEL);
+ if (!fwspec)
+ return -ENOMEM;
+
+ for (i = 0; i < num_ids; i++)
+ fwspec->ids[fwspec->num_ids + i] = ids[i];
+
+ fwspec->num_ids += num_ids;
+ dev->archdata.iommu = fwspec;
+ return 0;
+}
+
+inline struct iommu_fwspec *dev_iommu_fwspec(struct device *dev)
+{
+ return dev->archdata.iommu;
+}
diff --git a/include/linux/of_iommu.h b/include/linux/of_iommu.h
index e80b9c762a03..accdc0525f28 100644
--- a/include/linux/of_iommu.h
+++ b/include/linux/of_iommu.h
@@ -14,6 +14,14 @@ extern int of_get_dma_window(struct device_node *dn, const char *prefix,
extern const struct iommu_ops *of_iommu_configure(struct device *dev,
struct device_node *master_np);
+struct iommu_fwspec {
+ const struct iommu_ops *iommu_ops;
+ struct device_node *iommu_np;
+ void *iommu_priv;
+ unsigned int num_ids;
+ u32 ids[];
+};
+
#else
static inline int of_get_dma_window(struct device_node *dn, const char *prefix,
@@ -29,8 +37,15 @@ static inline const struct iommu_ops *of_iommu_configure(struct device *dev,
return NULL;
}
+struct iommu_fwspec;
+
#endif /* CONFIG_OF_IOMMU */
+int iommu_fwspec_init(struct device *dev, struct device_node *iommu_np);
+void iommu_fwspec_free(struct device *dev);
+int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
+struct iommu_fwspec *dev_iommu_fwspec(struct device *dev);
+
void of_iommu_set_ops(struct device_node *np, const struct iommu_ops *ops);
const struct iommu_ops *of_iommu_get_ops(struct device_node *np);
--
2.8.1.dirty
--
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^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 04/20] iommu/of: Introduce iommu_fwspec
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
Introduce a common structure to hold the per-device firmware data that
non-architectural IOMMU drivers generally need to keep track of.
Initially this is DT-specific to complement the existing of_iommu
support code, but will generalise further once other firmware methods
(e.g. ACPI IORT) come along.
Ultimately the aim is to promote the fwspec to a first-class member of
struct device, and handle the init/free automatically in the firmware
code. That way we can have API calls look for dev->fwspec->iommu_ops
before falling back to dev->bus->iommu_ops, and thus gracefully handle
those troublesome multi-IOMMU systems which we currently cannot. To
start with, though, make use of the existing archdata field and delegate
the init/free to drivers to allow an incremental conversion rather than
the impractical pain of trying to attempt everything in one go.
Suggested-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
- Replace crazy while loop with sane code
---
drivers/iommu/of_iommu.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/of_iommu.h | 15 ++++++++++++++
2 files changed, 69 insertions(+)
diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 19e1e8f2f871..04d616daffa3 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -226,3 +226,57 @@ static int __init of_iommu_init(void)
return 0;
}
postcore_initcall_sync(of_iommu_init);
+
+int iommu_fwspec_init(struct device *dev, struct device_node *iommu_np)
+{
+ struct iommu_fwspec *fwspec = dev->archdata.iommu;
+
+ if (fwspec)
+ return 0;
+
+ fwspec = kzalloc(sizeof(*fwspec), GFP_KERNEL);
+ if (!fwspec)
+ return -ENOMEM;
+
+ fwspec->iommu_np = of_node_get(iommu_np);
+ fwspec->iommu_ops = of_iommu_get_ops(iommu_np);
+ dev->archdata.iommu = fwspec;
+ return 0;
+}
+
+void iommu_fwspec_free(struct device *dev)
+{
+ struct iommu_fwspec *fwspec = dev->archdata.iommu;
+
+ if (fwspec) {
+ of_node_put(fwspec->iommu_np);
+ kfree(fwspec);
+ }
+}
+
+int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids)
+{
+ struct iommu_fwspec *fwspec = dev->archdata.iommu;
+ size_t size;
+ int i;
+
+ if (!fwspec)
+ return -EINVAL;
+
+ size = offsetof(struct iommu_fwspec, ids[fwspec->num_ids + num_ids]);
+ fwspec = krealloc(dev->archdata.iommu, size, GFP_KERNEL);
+ if (!fwspec)
+ return -ENOMEM;
+
+ for (i = 0; i < num_ids; i++)
+ fwspec->ids[fwspec->num_ids + i] = ids[i];
+
+ fwspec->num_ids += num_ids;
+ dev->archdata.iommu = fwspec;
+ return 0;
+}
+
+inline struct iommu_fwspec *dev_iommu_fwspec(struct device *dev)
+{
+ return dev->archdata.iommu;
+}
diff --git a/include/linux/of_iommu.h b/include/linux/of_iommu.h
index e80b9c762a03..accdc0525f28 100644
--- a/include/linux/of_iommu.h
+++ b/include/linux/of_iommu.h
@@ -14,6 +14,14 @@ extern int of_get_dma_window(struct device_node *dn, const char *prefix,
extern const struct iommu_ops *of_iommu_configure(struct device *dev,
struct device_node *master_np);
+struct iommu_fwspec {
+ const struct iommu_ops *iommu_ops;
+ struct device_node *iommu_np;
+ void *iommu_priv;
+ unsigned int num_ids;
+ u32 ids[];
+};
+
#else
static inline int of_get_dma_window(struct device_node *dn, const char *prefix,
@@ -29,8 +37,15 @@ static inline const struct iommu_ops *of_iommu_configure(struct device *dev,
return NULL;
}
+struct iommu_fwspec;
+
#endif /* CONFIG_OF_IOMMU */
+int iommu_fwspec_init(struct device *dev, struct device_node *iommu_np);
+void iommu_fwspec_free(struct device *dev);
+int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
+struct iommu_fwspec *dev_iommu_fwspec(struct device *dev);
+
void of_iommu_set_ops(struct device_node *np, const struct iommu_ops *ops);
const struct iommu_ops *of_iommu_get_ops(struct device_node *np);
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 05/20] iommu/arm-smmu: Implement of_xlate() for SMMUv3
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
Now that we can properly describe the mapping between PCI RIDs and
stream IDs via "iommu-map", and have it fed it to the driver
automatically via of_xlate(), rework the SMMUv3 driver to benefit from
that, and get rid of the current misuse of the "iommus" binding.
Since having of_xlate wired up means that masters will now be given the
appropriate DMA ops, we also need to make sure that default domains work
properly. This necessitates dispensing with the "whole group at a time"
notion for attaching to a domain, as devices which share a group get
attached to the group's default domain one by one as they are initially
probed.
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
drivers/iommu/arm-smmu-v3.c | 312 ++++++++++++++++++++------------------------
1 file changed, 139 insertions(+), 173 deletions(-)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index c040e246bc59..e460f46675b2 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -30,6 +30,7 @@
#include <linux/msi.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/of_iommu.h>
#include <linux/of_platform.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
@@ -606,12 +607,9 @@ struct arm_smmu_device {
struct arm_smmu_strtab_cfg strtab_cfg;
};
-/* SMMU private data for an IOMMU group */
-struct arm_smmu_group {
+/* SMMU private data for each master */
+struct arm_smmu_master_data {
struct arm_smmu_device *smmu;
- struct arm_smmu_domain *domain;
- int num_sids;
- u32 *sids;
struct arm_smmu_strtab_ent ste;
};
@@ -1550,20 +1548,6 @@ static int arm_smmu_domain_finalise(struct iommu_domain *domain)
return ret;
}
-static struct arm_smmu_group *arm_smmu_group_get(struct device *dev)
-{
- struct iommu_group *group;
- struct arm_smmu_group *smmu_group;
-
- group = iommu_group_get(dev);
- if (!group)
- return NULL;
-
- smmu_group = iommu_group_get_iommudata(group);
- iommu_group_put(group);
- return smmu_group;
-}
-
static __le64 *arm_smmu_get_step_for_sid(struct arm_smmu_device *smmu, u32 sid)
{
__le64 *step;
@@ -1586,27 +1570,17 @@ static __le64 *arm_smmu_get_step_for_sid(struct arm_smmu_device *smmu, u32 sid)
return step;
}
-static int arm_smmu_install_ste_for_group(struct arm_smmu_group *smmu_group)
+static int arm_smmu_install_ste_for_dev(struct iommu_fwspec *fwspec)
{
int i;
- struct arm_smmu_domain *smmu_domain = smmu_group->domain;
- struct arm_smmu_strtab_ent *ste = &smmu_group->ste;
- struct arm_smmu_device *smmu = smmu_group->smmu;
+ struct arm_smmu_master_data *master = fwspec->iommu_priv;
+ struct arm_smmu_device *smmu = master->smmu;
- if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
- ste->s1_cfg = &smmu_domain->s1_cfg;
- ste->s2_cfg = NULL;
- arm_smmu_write_ctx_desc(smmu, ste->s1_cfg);
- } else {
- ste->s1_cfg = NULL;
- ste->s2_cfg = &smmu_domain->s2_cfg;
- }
-
- for (i = 0; i < smmu_group->num_sids; ++i) {
- u32 sid = smmu_group->sids[i];
+ for (i = 0; i < fwspec->num_ids; ++i) {
+ u32 sid = fwspec->ids[i];
__le64 *step = arm_smmu_get_step_for_sid(smmu, sid);
- arm_smmu_write_strtab_ent(smmu, sid, step, ste);
+ arm_smmu_write_strtab_ent(smmu, sid, step, &master->ste);
}
return 0;
@@ -1614,13 +1588,12 @@ static int arm_smmu_install_ste_for_group(struct arm_smmu_group *smmu_group)
static void arm_smmu_detach_dev(struct device *dev)
{
- struct arm_smmu_group *smmu_group = arm_smmu_group_get(dev);
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
+ struct arm_smmu_master_data *master = fwspec->iommu_priv;
- smmu_group->ste.bypass = true;
- if (arm_smmu_install_ste_for_group(smmu_group) < 0)
+ master->ste.bypass = true;
+ if (arm_smmu_install_ste_for_dev(fwspec) < 0)
dev_warn(dev, "failed to install bypass STE\n");
-
- smmu_group->domain = NULL;
}
static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
@@ -1628,16 +1601,21 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
int ret = 0;
struct arm_smmu_device *smmu;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
- struct arm_smmu_group *smmu_group = arm_smmu_group_get(dev);
+ struct arm_smmu_master_data *master;
+ struct arm_smmu_strtab_ent *ste;
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
- if (!smmu_group)
+ if (!fwspec)
return -ENOENT;
+ master = fwspec->iommu_priv;
+ smmu = master->smmu;
+ ste = &master->ste;
+
/* Already attached to a different domain? */
- if (smmu_group->domain && smmu_group->domain != smmu_domain)
+ if (!ste->bypass)
arm_smmu_detach_dev(dev);
- smmu = smmu_group->smmu;
mutex_lock(&smmu_domain->init_mutex);
if (!smmu_domain->smmu) {
@@ -1656,21 +1634,21 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
goto out_unlock;
}
- /* Group already attached to this domain? */
- if (smmu_group->domain)
- goto out_unlock;
+ ste->bypass = false;
+ ste->valid = true;
- smmu_group->domain = smmu_domain;
+ if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
+ ste->s1_cfg = &smmu_domain->s1_cfg;
+ ste->s2_cfg = NULL;
+ arm_smmu_write_ctx_desc(smmu, ste->s1_cfg);
+ } else {
+ ste->s1_cfg = NULL;
+ ste->s2_cfg = &smmu_domain->s2_cfg;
+ }
- /*
- * FIXME: This should always be "false" once we have IOMMU-backed
- * DMA ops for all devices behind the SMMU.
- */
- smmu_group->ste.bypass = domain->type == IOMMU_DOMAIN_DMA;
-
- ret = arm_smmu_install_ste_for_group(smmu_group);
+ ret = arm_smmu_install_ste_for_dev(fwspec);
if (ret < 0)
- smmu_group->domain = NULL;
+ ste->valid = false;
out_unlock:
mutex_unlock(&smmu_domain->init_mutex);
@@ -1729,40 +1707,19 @@ arm_smmu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
return ret;
}
-static int __arm_smmu_get_pci_sid(struct pci_dev *pdev, u16 alias, void *sidp)
+static struct platform_driver arm_smmu_driver;
+
+static int arm_smmu_match_node(struct device *dev, void *data)
{
- *(u32 *)sidp = alias;
- return 0; /* Continue walking */
+ return dev->of_node == data;
}
-static void __arm_smmu_release_pci_iommudata(void *data)
+static struct arm_smmu_device *arm_smmu_get_by_node(struct device_node *np)
{
- kfree(data);
-}
-
-static struct arm_smmu_device *arm_smmu_get_for_pci_dev(struct pci_dev *pdev)
-{
- struct device_node *of_node;
- struct platform_device *smmu_pdev;
- struct arm_smmu_device *smmu = NULL;
- struct pci_bus *bus = pdev->bus;
-
- /* Walk up to the root bus */
- while (!pci_is_root_bus(bus))
- bus = bus->parent;
-
- /* Follow the "iommus" phandle from the host controller */
- of_node = of_parse_phandle(bus->bridge->parent->of_node, "iommus", 0);
- if (!of_node)
- return NULL;
-
- /* See if we can find an SMMU corresponding to the phandle */
- smmu_pdev = of_find_device_by_node(of_node);
- if (smmu_pdev)
- smmu = platform_get_drvdata(smmu_pdev);
-
- of_node_put(of_node);
- return smmu;
+ struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
+ np, arm_smmu_match_node);
+ put_device(dev);
+ return dev ? dev_get_drvdata(dev) : NULL;
}
static bool arm_smmu_sid_in_range(struct arm_smmu_device *smmu, u32 sid)
@@ -1775,94 +1732,74 @@ static bool arm_smmu_sid_in_range(struct arm_smmu_device *smmu, u32 sid)
return sid < limit;
}
+static struct iommu_ops arm_smmu_ops;
+
static int arm_smmu_add_device(struct device *dev)
{
int i, ret;
- u32 sid, *sids;
- struct pci_dev *pdev;
- struct iommu_group *group;
- struct arm_smmu_group *smmu_group;
struct arm_smmu_device *smmu;
+ struct arm_smmu_master_data *master;
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
+ struct iommu_group *group;
- /* We only support PCI, for now */
- if (!dev_is_pci(dev))
+ if (!fwspec || fwspec->iommu_ops != &arm_smmu_ops)
return -ENODEV;
-
- pdev = to_pci_dev(dev);
- group = iommu_group_get_for_dev(dev);
- if (IS_ERR(group))
- return PTR_ERR(group);
-
- smmu_group = iommu_group_get_iommudata(group);
- if (!smmu_group) {
- smmu = arm_smmu_get_for_pci_dev(pdev);
- if (!smmu) {
- ret = -ENOENT;
- goto out_remove_dev;
- }
-
- smmu_group = kzalloc(sizeof(*smmu_group), GFP_KERNEL);
- if (!smmu_group) {
- ret = -ENOMEM;
- goto out_remove_dev;
- }
-
- smmu_group->ste.valid = true;
- smmu_group->smmu = smmu;
- iommu_group_set_iommudata(group, smmu_group,
- __arm_smmu_release_pci_iommudata);
+ /*
+ * We _can_ actually withstand dodgy bus code re-calling add_device()
+ * without an intervening remove_device()/of_xlate() sequence, but
+ * we're not going to do so quietly...
+ */
+ if (WARN_ON_ONCE(fwspec->iommu_priv)) {
+ master = fwspec->iommu_priv;
+ smmu = master->smmu;
} else {
- smmu = smmu_group->smmu;
+ smmu = arm_smmu_get_by_node(fwspec->iommu_np);
+ if (!smmu)
+ return -ENODEV;
+ master = kzalloc(sizeof(*master), GFP_KERNEL);
+ if (!master)
+ return -ENOMEM;
+
+ master->smmu = smmu;
+ fwspec->iommu_priv = master;
}
- /* Assume SID == RID until firmware tells us otherwise */
- pci_for_each_dma_alias(pdev, __arm_smmu_get_pci_sid, &sid);
- for (i = 0; i < smmu_group->num_sids; ++i) {
- /* If we already know about this SID, then we're done */
- if (smmu_group->sids[i] == sid)
- goto out_put_group;
+ /* Check the SIDs are in range of the SMMU and our stream table */
+ for (i = 0; i < fwspec->num_ids; i++) {
+ u32 sid = fwspec->ids[i];
+
+ if (!arm_smmu_sid_in_range(smmu, sid))
+ return -ERANGE;
+
+ /* Ensure l2 strtab is initialised */
+ if (smmu->features & ARM_SMMU_FEAT_2_LVL_STRTAB) {
+ ret = arm_smmu_init_l2_strtab(smmu, sid);
+ if (ret)
+ return ret;
+ }
}
- /* Check the SID is in range of the SMMU and our stream table */
- if (!arm_smmu_sid_in_range(smmu, sid)) {
- ret = -ERANGE;
- goto out_remove_dev;
- }
+ group = iommu_group_get_for_dev(dev);
+ if (!IS_ERR(group))
+ iommu_group_put(group);
- /* Ensure l2 strtab is initialised */
- if (smmu->features & ARM_SMMU_FEAT_2_LVL_STRTAB) {
- ret = arm_smmu_init_l2_strtab(smmu, sid);
- if (ret)
- goto out_remove_dev;
- }
-
- /* Resize the SID array for the group */
- smmu_group->num_sids++;
- sids = krealloc(smmu_group->sids, smmu_group->num_sids * sizeof(*sids),
- GFP_KERNEL);
- if (!sids) {
- smmu_group->num_sids--;
- ret = -ENOMEM;
- goto out_remove_dev;
- }
-
- /* Add the new SID */
- sids[smmu_group->num_sids - 1] = sid;
- smmu_group->sids = sids;
-
-out_put_group:
- iommu_group_put(group);
- return 0;
-
-out_remove_dev:
- iommu_group_remove_device(dev);
- iommu_group_put(group);
- return ret;
+ return PTR_ERR_OR_ZERO(group);
}
static void arm_smmu_remove_device(struct device *dev)
{
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
+ struct arm_smmu_master_data *master;
+
+ if (!fwspec || fwspec->iommu_ops != &arm_smmu_ops)
+ return;
+
+ master = fwspec->iommu_priv;
+ if (master && master->ste.valid)
+ arm_smmu_detach_dev(dev);
iommu_group_remove_device(dev);
+ kfree(master);
+ iommu_fwspec_free(dev);
}
static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
@@ -1909,6 +1846,21 @@ out_unlock:
return ret;
}
+static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
+{
+ int ret;
+
+ /* We only support PCI, for now */
+ if (!dev_is_pci(dev))
+ return -ENODEV;
+
+ ret = iommu_fwspec_init(dev, args->np);
+ if (!ret)
+ ret = iommu_fwspec_add_ids(dev, &args->args[0], 1);
+
+ return ret;
+}
+
static struct iommu_ops arm_smmu_ops = {
.capable = arm_smmu_capable,
.domain_alloc = arm_smmu_domain_alloc,
@@ -1923,6 +1875,7 @@ static struct iommu_ops arm_smmu_ops = {
.device_group = pci_device_group,
.domain_get_attr = arm_smmu_domain_get_attr,
.domain_set_attr = arm_smmu_domain_set_attr,
+ .of_xlate = arm_smmu_of_xlate,
.pgsize_bitmap = -1UL, /* Restricted during device attach */
};
@@ -2621,7 +2574,14 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, smmu);
/* Reset the device */
- return arm_smmu_device_reset(smmu);
+ ret = arm_smmu_device_reset(smmu);
+ if (ret)
+ return ret;
+
+ /* And we're up. Go go go! */
+ of_iommu_set_ops(dev->of_node, &arm_smmu_ops);
+ pci_request_acs();
+ return bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
}
static int arm_smmu_device_remove(struct platform_device *pdev)
@@ -2649,22 +2609,14 @@ static struct platform_driver arm_smmu_driver = {
static int __init arm_smmu_init(void)
{
- struct device_node *np;
- int ret;
+ static bool registered;
+ int ret = 0;
- np = of_find_matching_node(NULL, arm_smmu_of_match);
- if (!np)
- return 0;
-
- of_node_put(np);
-
- ret = platform_driver_register(&arm_smmu_driver);
- if (ret)
- return ret;
-
- pci_request_acs();
-
- return bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
+ if (!registered) {
+ ret = platform_driver_register(&arm_smmu_driver);
+ registered = !ret;
+ }
+ return ret;
}
static void __exit arm_smmu_exit(void)
@@ -2675,6 +2627,20 @@ static void __exit arm_smmu_exit(void)
subsys_initcall(arm_smmu_init);
module_exit(arm_smmu_exit);
+static int __init arm_smmu_of_init(struct device_node *np)
+{
+ int ret = arm_smmu_init();
+
+ if (ret)
+ return ret;
+
+ if (!of_platform_device_create(np, NULL, platform_bus_type.dev_root))
+ return -ENODEV;
+
+ return 0;
+}
+IOMMU_OF_DECLARE(arm_smmuv3, "arm,smmu-v3", arm_smmu_of_init);
+
MODULE_DESCRIPTION("IOMMU API for ARM architected SMMUv3 implementations");
MODULE_AUTHOR("Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>");
MODULE_LICENSE("GPL v2");
--
2.8.1.dirty
--
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^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 05/20] iommu/arm-smmu: Implement of_xlate() for SMMUv3
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
Now that we can properly describe the mapping between PCI RIDs and
stream IDs via "iommu-map", and have it fed it to the driver
automatically via of_xlate(), rework the SMMUv3 driver to benefit from
that, and get rid of the current misuse of the "iommus" binding.
Since having of_xlate wired up means that masters will now be given the
appropriate DMA ops, we also need to make sure that default domains work
properly. This necessitates dispensing with the "whole group at a time"
notion for attaching to a domain, as devices which share a group get
attached to the group's default domain one by one as they are initially
probed.
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/iommu/arm-smmu-v3.c | 312 ++++++++++++++++++++------------------------
1 file changed, 139 insertions(+), 173 deletions(-)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index c040e246bc59..e460f46675b2 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -30,6 +30,7 @@
#include <linux/msi.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/of_iommu.h>
#include <linux/of_platform.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
@@ -606,12 +607,9 @@ struct arm_smmu_device {
struct arm_smmu_strtab_cfg strtab_cfg;
};
-/* SMMU private data for an IOMMU group */
-struct arm_smmu_group {
+/* SMMU private data for each master */
+struct arm_smmu_master_data {
struct arm_smmu_device *smmu;
- struct arm_smmu_domain *domain;
- int num_sids;
- u32 *sids;
struct arm_smmu_strtab_ent ste;
};
@@ -1550,20 +1548,6 @@ static int arm_smmu_domain_finalise(struct iommu_domain *domain)
return ret;
}
-static struct arm_smmu_group *arm_smmu_group_get(struct device *dev)
-{
- struct iommu_group *group;
- struct arm_smmu_group *smmu_group;
-
- group = iommu_group_get(dev);
- if (!group)
- return NULL;
-
- smmu_group = iommu_group_get_iommudata(group);
- iommu_group_put(group);
- return smmu_group;
-}
-
static __le64 *arm_smmu_get_step_for_sid(struct arm_smmu_device *smmu, u32 sid)
{
__le64 *step;
@@ -1586,27 +1570,17 @@ static __le64 *arm_smmu_get_step_for_sid(struct arm_smmu_device *smmu, u32 sid)
return step;
}
-static int arm_smmu_install_ste_for_group(struct arm_smmu_group *smmu_group)
+static int arm_smmu_install_ste_for_dev(struct iommu_fwspec *fwspec)
{
int i;
- struct arm_smmu_domain *smmu_domain = smmu_group->domain;
- struct arm_smmu_strtab_ent *ste = &smmu_group->ste;
- struct arm_smmu_device *smmu = smmu_group->smmu;
+ struct arm_smmu_master_data *master = fwspec->iommu_priv;
+ struct arm_smmu_device *smmu = master->smmu;
- if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
- ste->s1_cfg = &smmu_domain->s1_cfg;
- ste->s2_cfg = NULL;
- arm_smmu_write_ctx_desc(smmu, ste->s1_cfg);
- } else {
- ste->s1_cfg = NULL;
- ste->s2_cfg = &smmu_domain->s2_cfg;
- }
-
- for (i = 0; i < smmu_group->num_sids; ++i) {
- u32 sid = smmu_group->sids[i];
+ for (i = 0; i < fwspec->num_ids; ++i) {
+ u32 sid = fwspec->ids[i];
__le64 *step = arm_smmu_get_step_for_sid(smmu, sid);
- arm_smmu_write_strtab_ent(smmu, sid, step, ste);
+ arm_smmu_write_strtab_ent(smmu, sid, step, &master->ste);
}
return 0;
@@ -1614,13 +1588,12 @@ static int arm_smmu_install_ste_for_group(struct arm_smmu_group *smmu_group)
static void arm_smmu_detach_dev(struct device *dev)
{
- struct arm_smmu_group *smmu_group = arm_smmu_group_get(dev);
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
+ struct arm_smmu_master_data *master = fwspec->iommu_priv;
- smmu_group->ste.bypass = true;
- if (arm_smmu_install_ste_for_group(smmu_group) < 0)
+ master->ste.bypass = true;
+ if (arm_smmu_install_ste_for_dev(fwspec) < 0)
dev_warn(dev, "failed to install bypass STE\n");
-
- smmu_group->domain = NULL;
}
static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
@@ -1628,16 +1601,21 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
int ret = 0;
struct arm_smmu_device *smmu;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
- struct arm_smmu_group *smmu_group = arm_smmu_group_get(dev);
+ struct arm_smmu_master_data *master;
+ struct arm_smmu_strtab_ent *ste;
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
- if (!smmu_group)
+ if (!fwspec)
return -ENOENT;
+ master = fwspec->iommu_priv;
+ smmu = master->smmu;
+ ste = &master->ste;
+
/* Already attached to a different domain? */
- if (smmu_group->domain && smmu_group->domain != smmu_domain)
+ if (!ste->bypass)
arm_smmu_detach_dev(dev);
- smmu = smmu_group->smmu;
mutex_lock(&smmu_domain->init_mutex);
if (!smmu_domain->smmu) {
@@ -1656,21 +1634,21 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
goto out_unlock;
}
- /* Group already attached to this domain? */
- if (smmu_group->domain)
- goto out_unlock;
+ ste->bypass = false;
+ ste->valid = true;
- smmu_group->domain = smmu_domain;
+ if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
+ ste->s1_cfg = &smmu_domain->s1_cfg;
+ ste->s2_cfg = NULL;
+ arm_smmu_write_ctx_desc(smmu, ste->s1_cfg);
+ } else {
+ ste->s1_cfg = NULL;
+ ste->s2_cfg = &smmu_domain->s2_cfg;
+ }
- /*
- * FIXME: This should always be "false" once we have IOMMU-backed
- * DMA ops for all devices behind the SMMU.
- */
- smmu_group->ste.bypass = domain->type == IOMMU_DOMAIN_DMA;
-
- ret = arm_smmu_install_ste_for_group(smmu_group);
+ ret = arm_smmu_install_ste_for_dev(fwspec);
if (ret < 0)
- smmu_group->domain = NULL;
+ ste->valid = false;
out_unlock:
mutex_unlock(&smmu_domain->init_mutex);
@@ -1729,40 +1707,19 @@ arm_smmu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
return ret;
}
-static int __arm_smmu_get_pci_sid(struct pci_dev *pdev, u16 alias, void *sidp)
+static struct platform_driver arm_smmu_driver;
+
+static int arm_smmu_match_node(struct device *dev, void *data)
{
- *(u32 *)sidp = alias;
- return 0; /* Continue walking */
+ return dev->of_node == data;
}
-static void __arm_smmu_release_pci_iommudata(void *data)
+static struct arm_smmu_device *arm_smmu_get_by_node(struct device_node *np)
{
- kfree(data);
-}
-
-static struct arm_smmu_device *arm_smmu_get_for_pci_dev(struct pci_dev *pdev)
-{
- struct device_node *of_node;
- struct platform_device *smmu_pdev;
- struct arm_smmu_device *smmu = NULL;
- struct pci_bus *bus = pdev->bus;
-
- /* Walk up to the root bus */
- while (!pci_is_root_bus(bus))
- bus = bus->parent;
-
- /* Follow the "iommus" phandle from the host controller */
- of_node = of_parse_phandle(bus->bridge->parent->of_node, "iommus", 0);
- if (!of_node)
- return NULL;
-
- /* See if we can find an SMMU corresponding to the phandle */
- smmu_pdev = of_find_device_by_node(of_node);
- if (smmu_pdev)
- smmu = platform_get_drvdata(smmu_pdev);
-
- of_node_put(of_node);
- return smmu;
+ struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
+ np, arm_smmu_match_node);
+ put_device(dev);
+ return dev ? dev_get_drvdata(dev) : NULL;
}
static bool arm_smmu_sid_in_range(struct arm_smmu_device *smmu, u32 sid)
@@ -1775,94 +1732,74 @@ static bool arm_smmu_sid_in_range(struct arm_smmu_device *smmu, u32 sid)
return sid < limit;
}
+static struct iommu_ops arm_smmu_ops;
+
static int arm_smmu_add_device(struct device *dev)
{
int i, ret;
- u32 sid, *sids;
- struct pci_dev *pdev;
- struct iommu_group *group;
- struct arm_smmu_group *smmu_group;
struct arm_smmu_device *smmu;
+ struct arm_smmu_master_data *master;
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
+ struct iommu_group *group;
- /* We only support PCI, for now */
- if (!dev_is_pci(dev))
+ if (!fwspec || fwspec->iommu_ops != &arm_smmu_ops)
return -ENODEV;
-
- pdev = to_pci_dev(dev);
- group = iommu_group_get_for_dev(dev);
- if (IS_ERR(group))
- return PTR_ERR(group);
-
- smmu_group = iommu_group_get_iommudata(group);
- if (!smmu_group) {
- smmu = arm_smmu_get_for_pci_dev(pdev);
- if (!smmu) {
- ret = -ENOENT;
- goto out_remove_dev;
- }
-
- smmu_group = kzalloc(sizeof(*smmu_group), GFP_KERNEL);
- if (!smmu_group) {
- ret = -ENOMEM;
- goto out_remove_dev;
- }
-
- smmu_group->ste.valid = true;
- smmu_group->smmu = smmu;
- iommu_group_set_iommudata(group, smmu_group,
- __arm_smmu_release_pci_iommudata);
+ /*
+ * We _can_ actually withstand dodgy bus code re-calling add_device()
+ * without an intervening remove_device()/of_xlate() sequence, but
+ * we're not going to do so quietly...
+ */
+ if (WARN_ON_ONCE(fwspec->iommu_priv)) {
+ master = fwspec->iommu_priv;
+ smmu = master->smmu;
} else {
- smmu = smmu_group->smmu;
+ smmu = arm_smmu_get_by_node(fwspec->iommu_np);
+ if (!smmu)
+ return -ENODEV;
+ master = kzalloc(sizeof(*master), GFP_KERNEL);
+ if (!master)
+ return -ENOMEM;
+
+ master->smmu = smmu;
+ fwspec->iommu_priv = master;
}
- /* Assume SID == RID until firmware tells us otherwise */
- pci_for_each_dma_alias(pdev, __arm_smmu_get_pci_sid, &sid);
- for (i = 0; i < smmu_group->num_sids; ++i) {
- /* If we already know about this SID, then we're done */
- if (smmu_group->sids[i] == sid)
- goto out_put_group;
+ /* Check the SIDs are in range of the SMMU and our stream table */
+ for (i = 0; i < fwspec->num_ids; i++) {
+ u32 sid = fwspec->ids[i];
+
+ if (!arm_smmu_sid_in_range(smmu, sid))
+ return -ERANGE;
+
+ /* Ensure l2 strtab is initialised */
+ if (smmu->features & ARM_SMMU_FEAT_2_LVL_STRTAB) {
+ ret = arm_smmu_init_l2_strtab(smmu, sid);
+ if (ret)
+ return ret;
+ }
}
- /* Check the SID is in range of the SMMU and our stream table */
- if (!arm_smmu_sid_in_range(smmu, sid)) {
- ret = -ERANGE;
- goto out_remove_dev;
- }
+ group = iommu_group_get_for_dev(dev);
+ if (!IS_ERR(group))
+ iommu_group_put(group);
- /* Ensure l2 strtab is initialised */
- if (smmu->features & ARM_SMMU_FEAT_2_LVL_STRTAB) {
- ret = arm_smmu_init_l2_strtab(smmu, sid);
- if (ret)
- goto out_remove_dev;
- }
-
- /* Resize the SID array for the group */
- smmu_group->num_sids++;
- sids = krealloc(smmu_group->sids, smmu_group->num_sids * sizeof(*sids),
- GFP_KERNEL);
- if (!sids) {
- smmu_group->num_sids--;
- ret = -ENOMEM;
- goto out_remove_dev;
- }
-
- /* Add the new SID */
- sids[smmu_group->num_sids - 1] = sid;
- smmu_group->sids = sids;
-
-out_put_group:
- iommu_group_put(group);
- return 0;
-
-out_remove_dev:
- iommu_group_remove_device(dev);
- iommu_group_put(group);
- return ret;
+ return PTR_ERR_OR_ZERO(group);
}
static void arm_smmu_remove_device(struct device *dev)
{
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
+ struct arm_smmu_master_data *master;
+
+ if (!fwspec || fwspec->iommu_ops != &arm_smmu_ops)
+ return;
+
+ master = fwspec->iommu_priv;
+ if (master && master->ste.valid)
+ arm_smmu_detach_dev(dev);
iommu_group_remove_device(dev);
+ kfree(master);
+ iommu_fwspec_free(dev);
}
static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
@@ -1909,6 +1846,21 @@ out_unlock:
return ret;
}
+static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
+{
+ int ret;
+
+ /* We only support PCI, for now */
+ if (!dev_is_pci(dev))
+ return -ENODEV;
+
+ ret = iommu_fwspec_init(dev, args->np);
+ if (!ret)
+ ret = iommu_fwspec_add_ids(dev, &args->args[0], 1);
+
+ return ret;
+}
+
static struct iommu_ops arm_smmu_ops = {
.capable = arm_smmu_capable,
.domain_alloc = arm_smmu_domain_alloc,
@@ -1923,6 +1875,7 @@ static struct iommu_ops arm_smmu_ops = {
.device_group = pci_device_group,
.domain_get_attr = arm_smmu_domain_get_attr,
.domain_set_attr = arm_smmu_domain_set_attr,
+ .of_xlate = arm_smmu_of_xlate,
.pgsize_bitmap = -1UL, /* Restricted during device attach */
};
@@ -2621,7 +2574,14 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, smmu);
/* Reset the device */
- return arm_smmu_device_reset(smmu);
+ ret = arm_smmu_device_reset(smmu);
+ if (ret)
+ return ret;
+
+ /* And we're up. Go go go! */
+ of_iommu_set_ops(dev->of_node, &arm_smmu_ops);
+ pci_request_acs();
+ return bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
}
static int arm_smmu_device_remove(struct platform_device *pdev)
@@ -2649,22 +2609,14 @@ static struct platform_driver arm_smmu_driver = {
static int __init arm_smmu_init(void)
{
- struct device_node *np;
- int ret;
+ static bool registered;
+ int ret = 0;
- np = of_find_matching_node(NULL, arm_smmu_of_match);
- if (!np)
- return 0;
-
- of_node_put(np);
-
- ret = platform_driver_register(&arm_smmu_driver);
- if (ret)
- return ret;
-
- pci_request_acs();
-
- return bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
+ if (!registered) {
+ ret = platform_driver_register(&arm_smmu_driver);
+ registered = !ret;
+ }
+ return ret;
}
static void __exit arm_smmu_exit(void)
@@ -2675,6 +2627,20 @@ static void __exit arm_smmu_exit(void)
subsys_initcall(arm_smmu_init);
module_exit(arm_smmu_exit);
+static int __init arm_smmu_of_init(struct device_node *np)
+{
+ int ret = arm_smmu_init();
+
+ if (ret)
+ return ret;
+
+ if (!of_platform_device_create(np, NULL, platform_bus_type.dev_root))
+ return -ENODEV;
+
+ return 0;
+}
+IOMMU_OF_DECLARE(arm_smmuv3, "arm,smmu-v3", arm_smmu_of_init);
+
MODULE_DESCRIPTION("IOMMU API for ARM architected SMMUv3 implementations");
MODULE_AUTHOR("Will Deacon <will.deacon@arm.com>");
MODULE_LICENSE("GPL v2");
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 06/20] iommu/arm-smmu: Support non-PCI devices with SMMUv3
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA
With the device <-> stream ID relationship suitably abstracted and
of_xlate() hooked up, the PCI dependency now looks, and is, entirely
arbitrary. Any bus using the of_dma_configure() mechanism will work,
so extend support to the platform and AMBA buses which do just that.
Acked-by: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
drivers/iommu/Kconfig | 2 +-
drivers/iommu/arm-smmu-v3.c | 40 ++++++++++++++++++++++++++++++++--------
2 files changed, 33 insertions(+), 9 deletions(-)
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index d432ca828472..8ee54d71c7eb 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -309,7 +309,7 @@ config ARM_SMMU
config ARM_SMMU_V3
bool "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
- depends on ARM64 && PCI
+ depends on ARM64
select IOMMU_API
select IOMMU_IO_PGTABLE_LPAE
select GENERIC_MSI_IRQ_DOMAIN
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index e460f46675b2..d294a0aea253 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -35,6 +35,8 @@
#include <linux/pci.h>
#include <linux/platform_device.h>
+#include <linux/amba/bus.h>
+
#include "io-pgtable.h"
/* MMIO registers */
@@ -1802,6 +1804,23 @@ static void arm_smmu_remove_device(struct device *dev)
iommu_fwspec_free(dev);
}
+static struct iommu_group *arm_smmu_device_group(struct device *dev)
+{
+ struct iommu_group *group;
+
+ /*
+ * We don't support devices sharing stream IDs other than PCI RID
+ * aliases, since the necessary ID-to-device lookup becomes rather
+ * impractical given a potential sparse 32-bit stream ID space.
+ */
+ if (dev_is_pci(dev))
+ group = pci_device_group(dev);
+ else
+ group = generic_device_group(dev);
+
+ return group;
+}
+
static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
enum iommu_attr attr, void *data)
{
@@ -1848,13 +1867,8 @@ out_unlock:
static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
{
- int ret;
+ int ret = iommu_fwspec_init(dev, args->np);
- /* We only support PCI, for now */
- if (!dev_is_pci(dev))
- return -ENODEV;
-
- ret = iommu_fwspec_init(dev, args->np);
if (!ret)
ret = iommu_fwspec_add_ids(dev, &args->args[0], 1);
@@ -1872,7 +1886,7 @@ static struct iommu_ops arm_smmu_ops = {
.iova_to_phys = arm_smmu_iova_to_phys,
.add_device = arm_smmu_add_device,
.remove_device = arm_smmu_remove_device,
- .device_group = pci_device_group,
+ .device_group = arm_smmu_device_group,
.domain_get_attr = arm_smmu_domain_get_attr,
.domain_set_attr = arm_smmu_domain_set_attr,
.of_xlate = arm_smmu_of_xlate,
@@ -2580,8 +2594,18 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
/* And we're up. Go go go! */
of_iommu_set_ops(dev->of_node, &arm_smmu_ops);
+#ifdef CONFIG_PCI
pci_request_acs();
- return bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
+ ret = bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
+ if (ret)
+ return ret;
+#endif
+#ifdef CONFIG_ARM_AMBA
+ ret = bus_set_iommu(&amba_bustype, &arm_smmu_ops);
+ if (ret)
+ return ret;
+#endif
+ return bus_set_iommu(&platform_bus_type, &arm_smmu_ops);
}
static int arm_smmu_device_remove(struct platform_device *pdev)
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 06/20] iommu/arm-smmu: Support non-PCI devices with SMMUv3
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
With the device <-> stream ID relationship suitably abstracted and
of_xlate() hooked up, the PCI dependency now looks, and is, entirely
arbitrary. Any bus using the of_dma_configure() mechanism will work,
so extend support to the platform and AMBA buses which do just that.
Acked-by: Will Deacon <will.deacon@arm.com>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/iommu/Kconfig | 2 +-
drivers/iommu/arm-smmu-v3.c | 40 ++++++++++++++++++++++++++++++++--------
2 files changed, 33 insertions(+), 9 deletions(-)
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index d432ca828472..8ee54d71c7eb 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -309,7 +309,7 @@ config ARM_SMMU
config ARM_SMMU_V3
bool "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
- depends on ARM64 && PCI
+ depends on ARM64
select IOMMU_API
select IOMMU_IO_PGTABLE_LPAE
select GENERIC_MSI_IRQ_DOMAIN
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index e460f46675b2..d294a0aea253 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -35,6 +35,8 @@
#include <linux/pci.h>
#include <linux/platform_device.h>
+#include <linux/amba/bus.h>
+
#include "io-pgtable.h"
/* MMIO registers */
@@ -1802,6 +1804,23 @@ static void arm_smmu_remove_device(struct device *dev)
iommu_fwspec_free(dev);
}
+static struct iommu_group *arm_smmu_device_group(struct device *dev)
+{
+ struct iommu_group *group;
+
+ /*
+ * We don't support devices sharing stream IDs other than PCI RID
+ * aliases, since the necessary ID-to-device lookup becomes rather
+ * impractical given a potential sparse 32-bit stream ID space.
+ */
+ if (dev_is_pci(dev))
+ group = pci_device_group(dev);
+ else
+ group = generic_device_group(dev);
+
+ return group;
+}
+
static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
enum iommu_attr attr, void *data)
{
@@ -1848,13 +1867,8 @@ out_unlock:
static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
{
- int ret;
+ int ret = iommu_fwspec_init(dev, args->np);
- /* We only support PCI, for now */
- if (!dev_is_pci(dev))
- return -ENODEV;
-
- ret = iommu_fwspec_init(dev, args->np);
if (!ret)
ret = iommu_fwspec_add_ids(dev, &args->args[0], 1);
@@ -1872,7 +1886,7 @@ static struct iommu_ops arm_smmu_ops = {
.iova_to_phys = arm_smmu_iova_to_phys,
.add_device = arm_smmu_add_device,
.remove_device = arm_smmu_remove_device,
- .device_group = pci_device_group,
+ .device_group = arm_smmu_device_group,
.domain_get_attr = arm_smmu_domain_get_attr,
.domain_set_attr = arm_smmu_domain_set_attr,
.of_xlate = arm_smmu_of_xlate,
@@ -2580,8 +2594,18 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
/* And we're up. Go go go! */
of_iommu_set_ops(dev->of_node, &arm_smmu_ops);
+#ifdef CONFIG_PCI
pci_request_acs();
- return bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
+ ret = bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
+ if (ret)
+ return ret;
+#endif
+#ifdef CONFIG_ARM_AMBA
+ ret = bus_set_iommu(&amba_bustype, &arm_smmu_ops);
+ if (ret)
+ return ret;
+#endif
+ return bus_set_iommu(&platform_bus_type, &arm_smmu_ops);
}
static int arm_smmu_device_remove(struct platform_device *pdev)
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 07/20] iommu/arm-smmu: Set PRIVCFG in stage 1 STEs
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
Implement the SMMUv3 equivalent of d346180e70b9 ("iommu/arm-smmu: Treat
all device transactions as unprivileged"), so that once again those
pesky DMA controllers with their privileged instruction fetches don't
unexpectedly fault in stage 1 domains due to VMSAv8 rules.
Acked-by: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
drivers/iommu/arm-smmu-v3.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index d294a0aea253..1f350a50b35d 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -263,6 +263,9 @@
#define STRTAB_STE_1_SHCFG_INCOMING 1UL
#define STRTAB_STE_1_SHCFG_SHIFT 44
+#define STRTAB_STE_1_PRIVCFG_UNPRIV 2UL
+#define STRTAB_STE_1_PRIVCFG_SHIFT 48
+
#define STRTAB_STE_2_S2VMID_SHIFT 0
#define STRTAB_STE_2_S2VMID_MASK 0xffffUL
#define STRTAB_STE_2_VTCR_SHIFT 32
@@ -1063,7 +1066,9 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_device *smmu, u32 sid,
#ifdef CONFIG_PCI_ATS
STRTAB_STE_1_EATS_TRANS << STRTAB_STE_1_EATS_SHIFT |
#endif
- STRTAB_STE_1_STRW_NSEL1 << STRTAB_STE_1_STRW_SHIFT);
+ STRTAB_STE_1_STRW_NSEL1 << STRTAB_STE_1_STRW_SHIFT |
+ STRTAB_STE_1_PRIVCFG_UNPRIV <<
+ STRTAB_STE_1_PRIVCFG_SHIFT);
if (smmu->features & ARM_SMMU_FEAT_STALLS)
dst[1] |= cpu_to_le64(STRTAB_STE_1_S1STALLD);
--
2.8.1.dirty
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 07/20] iommu/arm-smmu: Set PRIVCFG in stage 1 STEs
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
Implement the SMMUv3 equivalent of d346180e70b9 ("iommu/arm-smmu: Treat
all device transactions as unprivileged"), so that once again those
pesky DMA controllers with their privileged instruction fetches don't
unexpectedly fault in stage 1 domains due to VMSAv8 rules.
Acked-by: Will Deacon <will.deacon@arm.com>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/iommu/arm-smmu-v3.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index d294a0aea253..1f350a50b35d 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -263,6 +263,9 @@
#define STRTAB_STE_1_SHCFG_INCOMING 1UL
#define STRTAB_STE_1_SHCFG_SHIFT 44
+#define STRTAB_STE_1_PRIVCFG_UNPRIV 2UL
+#define STRTAB_STE_1_PRIVCFG_SHIFT 48
+
#define STRTAB_STE_2_S2VMID_SHIFT 0
#define STRTAB_STE_2_S2VMID_MASK 0xffffUL
#define STRTAB_STE_2_VTCR_SHIFT 32
@@ -1063,7 +1066,9 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_device *smmu, u32 sid,
#ifdef CONFIG_PCI_ATS
STRTAB_STE_1_EATS_TRANS << STRTAB_STE_1_EATS_SHIFT |
#endif
- STRTAB_STE_1_STRW_NSEL1 << STRTAB_STE_1_STRW_SHIFT);
+ STRTAB_STE_1_STRW_NSEL1 << STRTAB_STE_1_STRW_SHIFT |
+ STRTAB_STE_1_PRIVCFG_UNPRIV <<
+ STRTAB_STE_1_PRIVCFG_SHIFT);
if (smmu->features & ARM_SMMU_FEAT_STALLS)
dst[1] |= cpu_to_le64(STRTAB_STE_1_S1STALLD);
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 08/20] iommu/arm-smmu: Handle stream IDs more dynamically
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
Rather than assuming fixed worst-case values for stream IDs and SMR
masks, keep track of whatever implemented bits the hardware actually
reports. This also obviates the slightly questionable validation of SMR
fields in isolation - rather than aborting the whole SMMU probe for a
hardware configuration which is still architecturally valid, we can
simply refuse masters later if they try to claim an unrepresentable ID
or mask (which almost certainly implies a DT error anyway).
Acked-by: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
drivers/iommu/arm-smmu.c | 43 ++++++++++++++++++++++---------------------
1 file changed, 22 insertions(+), 21 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 4b1c87e947fd..f86d7887f69a 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -165,9 +165,7 @@
#define ARM_SMMU_GR0_SMR(n) (0x800 + ((n) << 2))
#define SMR_VALID (1 << 31)
#define SMR_MASK_SHIFT 16
-#define SMR_MASK_MASK 0x7fff
#define SMR_ID_SHIFT 0
-#define SMR_ID_MASK 0x7fff
#define ARM_SMMU_GR0_S2CR(n) (0xc00 + ((n) << 2))
#define S2CR_CBNDX_SHIFT 0
@@ -346,6 +344,8 @@ struct arm_smmu_device {
atomic_t irptndx;
u32 num_mapping_groups;
+ u16 streamid_mask;
+ u16 smr_mask_mask;
DECLARE_BITMAP(smr_map, ARM_SMMU_MAX_SMRS);
unsigned long va_size;
@@ -1715,39 +1715,40 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
dev_notice(smmu->dev,
"\t(IDR0.CTTW overridden by dma-coherent property)\n");
+ /* Max. number of entries we have for stream matching/indexing */
+ size = 1 << ((id >> ID0_NUMSIDB_SHIFT) & ID0_NUMSIDB_MASK);
+ smmu->streamid_mask = size - 1;
if (id & ID0_SMS) {
- u32 smr, sid, mask;
+ u32 smr;
smmu->features |= ARM_SMMU_FEAT_STREAM_MATCH;
- smmu->num_mapping_groups = (id >> ID0_NUMSMRG_SHIFT) &
- ID0_NUMSMRG_MASK;
- if (smmu->num_mapping_groups == 0) {
+ size = (id >> ID0_NUMSMRG_SHIFT) & ID0_NUMSMRG_MASK;
+ if (size == 0) {
dev_err(smmu->dev,
"stream-matching supported, but no SMRs present!\n");
return -ENODEV;
}
- smr = SMR_MASK_MASK << SMR_MASK_SHIFT;
- smr |= (SMR_ID_MASK << SMR_ID_SHIFT);
+ /*
+ * SMR.ID bits may not be preserved if the corresponding MASK
+ * bits are set, so check each one separately. We can reject
+ * masters later if they try to claim IDs outside these masks.
+ */
+ smr = smmu->streamid_mask << SMR_ID_SHIFT;
writel_relaxed(smr, gr0_base + ARM_SMMU_GR0_SMR(0));
smr = readl_relaxed(gr0_base + ARM_SMMU_GR0_SMR(0));
+ smmu->streamid_mask = smr >> SMR_ID_SHIFT;
- mask = (smr >> SMR_MASK_SHIFT) & SMR_MASK_MASK;
- sid = (smr >> SMR_ID_SHIFT) & SMR_ID_MASK;
- if ((mask & sid) != sid) {
- dev_err(smmu->dev,
- "SMR mask bits (0x%x) insufficient for ID field (0x%x)\n",
- mask, sid);
- return -ENODEV;
- }
+ smr = smmu->streamid_mask << SMR_MASK_SHIFT;
+ writel_relaxed(smr, gr0_base + ARM_SMMU_GR0_SMR(0));
+ smr = readl_relaxed(gr0_base + ARM_SMMU_GR0_SMR(0));
+ smmu->smr_mask_mask = smr >> SMR_MASK_SHIFT;
dev_notice(smmu->dev,
- "\tstream matching with %u register groups, mask 0x%x",
- smmu->num_mapping_groups, mask);
- } else {
- smmu->num_mapping_groups = (id >> ID0_NUMSIDB_SHIFT) &
- ID0_NUMSIDB_MASK;
+ "\tstream matching with %lu register groups, mask 0x%x",
+ size, smmu->smr_mask_mask);
}
+ smmu->num_mapping_groups = size;
if (smmu->version < ARM_SMMU_V2 || !(id & ID0_PTFS_NO_AARCH32)) {
smmu->features |= ARM_SMMU_FEAT_FMT_AARCH32_L;
--
2.8.1.dirty
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
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^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 08/20] iommu/arm-smmu: Handle stream IDs more dynamically
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
Rather than assuming fixed worst-case values for stream IDs and SMR
masks, keep track of whatever implemented bits the hardware actually
reports. This also obviates the slightly questionable validation of SMR
fields in isolation - rather than aborting the whole SMMU probe for a
hardware configuration which is still architecturally valid, we can
simply refuse masters later if they try to claim an unrepresentable ID
or mask (which almost certainly implies a DT error anyway).
Acked-by: Will Deacon <will.deacon@arm.com>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/iommu/arm-smmu.c | 43 ++++++++++++++++++++++---------------------
1 file changed, 22 insertions(+), 21 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 4b1c87e947fd..f86d7887f69a 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -165,9 +165,7 @@
#define ARM_SMMU_GR0_SMR(n) (0x800 + ((n) << 2))
#define SMR_VALID (1 << 31)
#define SMR_MASK_SHIFT 16
-#define SMR_MASK_MASK 0x7fff
#define SMR_ID_SHIFT 0
-#define SMR_ID_MASK 0x7fff
#define ARM_SMMU_GR0_S2CR(n) (0xc00 + ((n) << 2))
#define S2CR_CBNDX_SHIFT 0
@@ -346,6 +344,8 @@ struct arm_smmu_device {
atomic_t irptndx;
u32 num_mapping_groups;
+ u16 streamid_mask;
+ u16 smr_mask_mask;
DECLARE_BITMAP(smr_map, ARM_SMMU_MAX_SMRS);
unsigned long va_size;
@@ -1715,39 +1715,40 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
dev_notice(smmu->dev,
"\t(IDR0.CTTW overridden by dma-coherent property)\n");
+ /* Max. number of entries we have for stream matching/indexing */
+ size = 1 << ((id >> ID0_NUMSIDB_SHIFT) & ID0_NUMSIDB_MASK);
+ smmu->streamid_mask = size - 1;
if (id & ID0_SMS) {
- u32 smr, sid, mask;
+ u32 smr;
smmu->features |= ARM_SMMU_FEAT_STREAM_MATCH;
- smmu->num_mapping_groups = (id >> ID0_NUMSMRG_SHIFT) &
- ID0_NUMSMRG_MASK;
- if (smmu->num_mapping_groups == 0) {
+ size = (id >> ID0_NUMSMRG_SHIFT) & ID0_NUMSMRG_MASK;
+ if (size == 0) {
dev_err(smmu->dev,
"stream-matching supported, but no SMRs present!\n");
return -ENODEV;
}
- smr = SMR_MASK_MASK << SMR_MASK_SHIFT;
- smr |= (SMR_ID_MASK << SMR_ID_SHIFT);
+ /*
+ * SMR.ID bits may not be preserved if the corresponding MASK
+ * bits are set, so check each one separately. We can reject
+ * masters later if they try to claim IDs outside these masks.
+ */
+ smr = smmu->streamid_mask << SMR_ID_SHIFT;
writel_relaxed(smr, gr0_base + ARM_SMMU_GR0_SMR(0));
smr = readl_relaxed(gr0_base + ARM_SMMU_GR0_SMR(0));
+ smmu->streamid_mask = smr >> SMR_ID_SHIFT;
- mask = (smr >> SMR_MASK_SHIFT) & SMR_MASK_MASK;
- sid = (smr >> SMR_ID_SHIFT) & SMR_ID_MASK;
- if ((mask & sid) != sid) {
- dev_err(smmu->dev,
- "SMR mask bits (0x%x) insufficient for ID field (0x%x)\n",
- mask, sid);
- return -ENODEV;
- }
+ smr = smmu->streamid_mask << SMR_MASK_SHIFT;
+ writel_relaxed(smr, gr0_base + ARM_SMMU_GR0_SMR(0));
+ smr = readl_relaxed(gr0_base + ARM_SMMU_GR0_SMR(0));
+ smmu->smr_mask_mask = smr >> SMR_MASK_SHIFT;
dev_notice(smmu->dev,
- "\tstream matching with %u register groups, mask 0x%x",
- smmu->num_mapping_groups, mask);
- } else {
- smmu->num_mapping_groups = (id >> ID0_NUMSIDB_SHIFT) &
- ID0_NUMSIDB_MASK;
+ "\tstream matching with %lu register groups, mask 0x%x",
+ size, smmu->smr_mask_mask);
}
+ smmu->num_mapping_groups = size;
if (smmu->version < ARM_SMMU_V2 || !(id & ID0_PTFS_NO_AARCH32)) {
smmu->features |= ARM_SMMU_FEAT_FMT_AARCH32_L;
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 09/20] iommu/arm-smmu: Consolidate stream map entry state
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
In order to consider SMR masking, we really want to be able to validate
ID/mask pairs against existing SMR contents to prevent stream match
conflicts, which at best would cause transactions to fault unexpectedly,
and at worst lead to silent unpredictable behaviour. With our SMMU
instance data holding only an allocator bitmap, and the SMR values
themselves scattered across master configs hanging off devices which we
may have no way of finding, there's essentially no way short of digging
everything back out of the hardware. Similarly, the thought of power
management ops to support suspend/resume faces the exact same problem.
By massaging the software state into a closer shape to the underlying
hardware, everything comes together quite nicely; the allocator and the
high-level view of the data become a single centralised state which we
can easily keep track of, and to which any updates can be validated in
full before being synchronised to the hardware itself.
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
- Make INVALID_SMENDX checks explicit
---
drivers/iommu/arm-smmu.c | 147 +++++++++++++++++++++++++++--------------------
1 file changed, 86 insertions(+), 61 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index f86d7887f69a..dfe13780ba54 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -28,6 +28,7 @@
#define pr_fmt(fmt) "arm-smmu: " fmt
+#include <linux/atomic.h>
#include <linux/delay.h>
#include <linux/dma-iommu.h>
#include <linux/dma-mapping.h>
@@ -55,9 +56,6 @@
/* Maximum number of context banks per SMMU */
#define ARM_SMMU_MAX_CBS 128
-/* Maximum number of mapping groups per SMMU */
-#define ARM_SMMU_MAX_SMRS 128
-
/* SMMU global address space */
#define ARM_SMMU_GR0(smmu) ((smmu)->base)
#define ARM_SMMU_GR1(smmu) ((smmu)->base + (1 << (smmu)->pgshift))
@@ -295,16 +293,17 @@ enum arm_smmu_implementation {
};
struct arm_smmu_smr {
- u8 idx;
u16 mask;
u16 id;
+ bool valid;
};
struct arm_smmu_master_cfg {
int num_streamids;
u16 streamids[MAX_MASTER_STREAMIDS];
- struct arm_smmu_smr *smrs;
+ s16 smendx[MAX_MASTER_STREAMIDS];
};
+#define INVALID_SMENDX -1
struct arm_smmu_master {
struct device_node *of_node;
@@ -346,7 +345,7 @@ struct arm_smmu_device {
u32 num_mapping_groups;
u16 streamid_mask;
u16 smr_mask_mask;
- DECLARE_BITMAP(smr_map, ARM_SMMU_MAX_SMRS);
+ struct arm_smmu_smr *smrs;
unsigned long va_size;
unsigned long ipa_size;
@@ -550,6 +549,7 @@ static int register_smmu_master(struct arm_smmu_device *smmu,
return -ERANGE;
}
master->cfg.streamids[i] = streamid;
+ master->cfg.smendx[i] = INVALID_SMENDX;
}
return insert_smmu_master(smmu, master);
}
@@ -1080,79 +1080,91 @@ static void arm_smmu_domain_free(struct iommu_domain *domain)
kfree(smmu_domain);
}
-static int arm_smmu_master_configure_smrs(struct arm_smmu_device *smmu,
- struct arm_smmu_master_cfg *cfg)
+static int arm_smmu_alloc_smr(struct arm_smmu_device *smmu)
{
int i;
- struct arm_smmu_smr *smrs;
- void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
- if (!(smmu->features & ARM_SMMU_FEAT_STREAM_MATCH))
- return 0;
+ for (i = 0; i < smmu->num_mapping_groups; i++)
+ if (!cmpxchg(&smmu->smrs[i].valid, false, true))
+ return i;
- if (cfg->smrs)
- return -EEXIST;
+ return INVALID_SMENDX;
+}
- smrs = kmalloc_array(cfg->num_streamids, sizeof(*smrs), GFP_KERNEL);
- if (!smrs) {
- dev_err(smmu->dev, "failed to allocate %d SMRs\n",
- cfg->num_streamids);
- return -ENOMEM;
- }
+static void arm_smmu_free_smr(struct arm_smmu_device *smmu, int idx)
+{
+ writel_relaxed(~SMR_VALID, ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_SMR(idx));
+ WRITE_ONCE(smmu->smrs[idx].valid, false);
+}
+
+static void arm_smmu_write_smr(struct arm_smmu_device *smmu, int idx)
+{
+ struct arm_smmu_smr *smr = smmu->smrs + idx;
+ u32 reg = (smr->id & smmu->streamid_mask) << SMR_ID_SHIFT |
+ (smr->mask & smmu->smr_mask_mask) << SMR_MASK_SHIFT;
+
+ if (smr->valid)
+ reg |= SMR_VALID;
+ writel_relaxed(reg, ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_SMR(idx));
+}
+
+static int arm_smmu_master_alloc_smes(struct arm_smmu_device *smmu,
+ struct arm_smmu_master_cfg *cfg)
+{
+ struct arm_smmu_smr *smrs = smmu->smrs;
+ int i, idx;
/* Allocate the SMRs on the SMMU */
for (i = 0; i < cfg->num_streamids; ++i) {
- int idx = __arm_smmu_alloc_bitmap(smmu->smr_map, 0,
- smmu->num_mapping_groups);
+ if (cfg->smendx[i] != INVALID_SMENDX)
+ return -EEXIST;
+
+ /* ...except on stream indexing hardware, of course */
+ if (!smrs) {
+ cfg->smendx[i] = cfg->streamids[i];
+ continue;
+ }
+
+ idx = arm_smmu_alloc_smr(smmu);
if (idx < 0) {
dev_err(smmu->dev, "failed to allocate free SMR\n");
goto err_free_smrs;
}
+ cfg->smendx[i] = idx;
- smrs[i] = (struct arm_smmu_smr) {
- .idx = idx,
- .mask = 0, /* We don't currently share SMRs */
- .id = cfg->streamids[i],
- };
+ smrs[idx].id = cfg->streamids[i];
+ smrs[idx].mask = 0; /* We don't currently share SMRs */
}
+ if (!smrs)
+ return 0;
+
/* It worked! Now, poke the actual hardware */
- for (i = 0; i < cfg->num_streamids; ++i) {
- u32 reg = SMR_VALID | smrs[i].id << SMR_ID_SHIFT |
- smrs[i].mask << SMR_MASK_SHIFT;
- writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_SMR(smrs[i].idx));
- }
+ for (i = 0; i < cfg->num_streamids; ++i)
+ arm_smmu_write_smr(smmu, cfg->smendx[i]);
- cfg->smrs = smrs;
return 0;
err_free_smrs:
- while (--i >= 0)
- __arm_smmu_free_bitmap(smmu->smr_map, smrs[i].idx);
- kfree(smrs);
+ while (i--) {
+ arm_smmu_free_smr(smmu, cfg->smendx[i]);
+ cfg->smendx[i] = INVALID_SMENDX;
+ }
return -ENOSPC;
}
-static void arm_smmu_master_free_smrs(struct arm_smmu_device *smmu,
+static void arm_smmu_master_free_smes(struct arm_smmu_device *smmu,
struct arm_smmu_master_cfg *cfg)
{
int i;
- void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
- struct arm_smmu_smr *smrs = cfg->smrs;
-
- if (!smrs)
- return;
/* Invalidate the SMRs before freeing back to the allocator */
for (i = 0; i < cfg->num_streamids; ++i) {
- u8 idx = smrs[i].idx;
+ if (smmu->smrs)
+ arm_smmu_free_smr(smmu, cfg->smendx[i]);
- writel_relaxed(~SMR_VALID, gr0_base + ARM_SMMU_GR0_SMR(idx));
- __arm_smmu_free_bitmap(smmu->smr_map, idx);
+ cfg->smendx[i] = INVALID_SMENDX;
}
-
- cfg->smrs = NULL;
- kfree(smrs);
}
static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
@@ -1172,14 +1184,14 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
return 0;
/* Devices in an IOMMU group may already be configured */
- ret = arm_smmu_master_configure_smrs(smmu, cfg);
+ ret = arm_smmu_master_alloc_smes(smmu, cfg);
if (ret)
return ret == -EEXIST ? 0 : ret;
for (i = 0; i < cfg->num_streamids; ++i) {
u32 idx, s2cr;
- idx = cfg->smrs ? cfg->smrs[i].idx : cfg->streamids[i];
+ idx = cfg->smendx[i];
s2cr = S2CR_TYPE_TRANS | S2CR_PRIVCFG_UNPRIV |
(smmu_domain->cfg.cbndx << S2CR_CBNDX_SHIFT);
writel_relaxed(s2cr, gr0_base + ARM_SMMU_GR0_S2CR(idx));
@@ -1195,22 +1207,22 @@ static void arm_smmu_domain_remove_master(struct arm_smmu_domain *smmu_domain,
struct arm_smmu_device *smmu = smmu_domain->smmu;
void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
- /* An IOMMU group is torn down by the first device to be removed */
- if ((smmu->features & ARM_SMMU_FEAT_STREAM_MATCH) && !cfg->smrs)
- return;
-
/*
* We *must* clear the S2CR first, because freeing the SMR means
* that it can be re-allocated immediately.
*/
for (i = 0; i < cfg->num_streamids; ++i) {
- u32 idx = cfg->smrs ? cfg->smrs[i].idx : cfg->streamids[i];
+ int idx = cfg->smendx[i];
u32 reg = disable_bypass ? S2CR_TYPE_FAULT : S2CR_TYPE_BYPASS;
+ /* An IOMMU group is torn down by the first device to be removed */
+ if (idx == INVALID_SMENDX)
+ return;
+
writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_S2CR(idx));
}
- arm_smmu_master_free_smrs(smmu, cfg);
+ arm_smmu_master_free_smes(smmu, cfg);
}
static void arm_smmu_detach_dev(struct device *dev,
@@ -1424,8 +1436,11 @@ static int arm_smmu_init_pci_device(struct pci_dev *pdev,
break;
/* Avoid duplicate SIDs, as this can lead to SMR conflicts */
- if (i == cfg->num_streamids)
- cfg->streamids[cfg->num_streamids++] = sid;
+ if (i == cfg->num_streamids) {
+ cfg->streamids[i] = sid;
+ cfg->smendx[i] = INVALID_SMENDX;
+ cfg->num_streamids++;
+ }
return 0;
}
@@ -1556,17 +1571,21 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
{
void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
void __iomem *cb_base;
- int i = 0;
+ int i;
u32 reg, major;
/* clear global FSR */
reg = readl_relaxed(ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sGFSR);
writel(reg, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sGFSR);
- /* Mark all SMRn as invalid and all S2CRn as bypass unless overridden */
+ /*
+ * Reset stream mapping groups: Initial values mark all SMRn as
+ * invalid and all S2CRn as bypass unless overridden.
+ */
reg = disable_bypass ? S2CR_TYPE_FAULT : S2CR_TYPE_BYPASS;
for (i = 0; i < smmu->num_mapping_groups; ++i) {
- writel_relaxed(0, gr0_base + ARM_SMMU_GR0_SMR(i));
+ if (smmu->smrs)
+ arm_smmu_write_smr(smmu, i);
writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_S2CR(i));
}
@@ -1744,6 +1763,12 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
smr = readl_relaxed(gr0_base + ARM_SMMU_GR0_SMR(0));
smmu->smr_mask_mask = smr >> SMR_MASK_SHIFT;
+ /* Zero-initialised to mark as invalid */
+ smmu->smrs = devm_kcalloc(smmu->dev, size, sizeof(*smmu->smrs),
+ GFP_KERNEL);
+ if (!smmu->smrs)
+ return -ENOMEM;
+
dev_notice(smmu->dev,
"\tstream matching with %lu register groups, mask 0x%x",
size, smmu->smr_mask_mask);
--
2.8.1.dirty
--
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^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 09/20] iommu/arm-smmu: Consolidate stream map entry state
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
In order to consider SMR masking, we really want to be able to validate
ID/mask pairs against existing SMR contents to prevent stream match
conflicts, which at best would cause transactions to fault unexpectedly,
and at worst lead to silent unpredictable behaviour. With our SMMU
instance data holding only an allocator bitmap, and the SMR values
themselves scattered across master configs hanging off devices which we
may have no way of finding, there's essentially no way short of digging
everything back out of the hardware. Similarly, the thought of power
management ops to support suspend/resume faces the exact same problem.
By massaging the software state into a closer shape to the underlying
hardware, everything comes together quite nicely; the allocator and the
high-level view of the data become a single centralised state which we
can easily keep track of, and to which any updates can be validated in
full before being synchronised to the hardware itself.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
- Make INVALID_SMENDX checks explicit
---
drivers/iommu/arm-smmu.c | 147 +++++++++++++++++++++++++++--------------------
1 file changed, 86 insertions(+), 61 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index f86d7887f69a..dfe13780ba54 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -28,6 +28,7 @@
#define pr_fmt(fmt) "arm-smmu: " fmt
+#include <linux/atomic.h>
#include <linux/delay.h>
#include <linux/dma-iommu.h>
#include <linux/dma-mapping.h>
@@ -55,9 +56,6 @@
/* Maximum number of context banks per SMMU */
#define ARM_SMMU_MAX_CBS 128
-/* Maximum number of mapping groups per SMMU */
-#define ARM_SMMU_MAX_SMRS 128
-
/* SMMU global address space */
#define ARM_SMMU_GR0(smmu) ((smmu)->base)
#define ARM_SMMU_GR1(smmu) ((smmu)->base + (1 << (smmu)->pgshift))
@@ -295,16 +293,17 @@ enum arm_smmu_implementation {
};
struct arm_smmu_smr {
- u8 idx;
u16 mask;
u16 id;
+ bool valid;
};
struct arm_smmu_master_cfg {
int num_streamids;
u16 streamids[MAX_MASTER_STREAMIDS];
- struct arm_smmu_smr *smrs;
+ s16 smendx[MAX_MASTER_STREAMIDS];
};
+#define INVALID_SMENDX -1
struct arm_smmu_master {
struct device_node *of_node;
@@ -346,7 +345,7 @@ struct arm_smmu_device {
u32 num_mapping_groups;
u16 streamid_mask;
u16 smr_mask_mask;
- DECLARE_BITMAP(smr_map, ARM_SMMU_MAX_SMRS);
+ struct arm_smmu_smr *smrs;
unsigned long va_size;
unsigned long ipa_size;
@@ -550,6 +549,7 @@ static int register_smmu_master(struct arm_smmu_device *smmu,
return -ERANGE;
}
master->cfg.streamids[i] = streamid;
+ master->cfg.smendx[i] = INVALID_SMENDX;
}
return insert_smmu_master(smmu, master);
}
@@ -1080,79 +1080,91 @@ static void arm_smmu_domain_free(struct iommu_domain *domain)
kfree(smmu_domain);
}
-static int arm_smmu_master_configure_smrs(struct arm_smmu_device *smmu,
- struct arm_smmu_master_cfg *cfg)
+static int arm_smmu_alloc_smr(struct arm_smmu_device *smmu)
{
int i;
- struct arm_smmu_smr *smrs;
- void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
- if (!(smmu->features & ARM_SMMU_FEAT_STREAM_MATCH))
- return 0;
+ for (i = 0; i < smmu->num_mapping_groups; i++)
+ if (!cmpxchg(&smmu->smrs[i].valid, false, true))
+ return i;
- if (cfg->smrs)
- return -EEXIST;
+ return INVALID_SMENDX;
+}
- smrs = kmalloc_array(cfg->num_streamids, sizeof(*smrs), GFP_KERNEL);
- if (!smrs) {
- dev_err(smmu->dev, "failed to allocate %d SMRs\n",
- cfg->num_streamids);
- return -ENOMEM;
- }
+static void arm_smmu_free_smr(struct arm_smmu_device *smmu, int idx)
+{
+ writel_relaxed(~SMR_VALID, ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_SMR(idx));
+ WRITE_ONCE(smmu->smrs[idx].valid, false);
+}
+
+static void arm_smmu_write_smr(struct arm_smmu_device *smmu, int idx)
+{
+ struct arm_smmu_smr *smr = smmu->smrs + idx;
+ u32 reg = (smr->id & smmu->streamid_mask) << SMR_ID_SHIFT |
+ (smr->mask & smmu->smr_mask_mask) << SMR_MASK_SHIFT;
+
+ if (smr->valid)
+ reg |= SMR_VALID;
+ writel_relaxed(reg, ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_SMR(idx));
+}
+
+static int arm_smmu_master_alloc_smes(struct arm_smmu_device *smmu,
+ struct arm_smmu_master_cfg *cfg)
+{
+ struct arm_smmu_smr *smrs = smmu->smrs;
+ int i, idx;
/* Allocate the SMRs on the SMMU */
for (i = 0; i < cfg->num_streamids; ++i) {
- int idx = __arm_smmu_alloc_bitmap(smmu->smr_map, 0,
- smmu->num_mapping_groups);
+ if (cfg->smendx[i] != INVALID_SMENDX)
+ return -EEXIST;
+
+ /* ...except on stream indexing hardware, of course */
+ if (!smrs) {
+ cfg->smendx[i] = cfg->streamids[i];
+ continue;
+ }
+
+ idx = arm_smmu_alloc_smr(smmu);
if (idx < 0) {
dev_err(smmu->dev, "failed to allocate free SMR\n");
goto err_free_smrs;
}
+ cfg->smendx[i] = idx;
- smrs[i] = (struct arm_smmu_smr) {
- .idx = idx,
- .mask = 0, /* We don't currently share SMRs */
- .id = cfg->streamids[i],
- };
+ smrs[idx].id = cfg->streamids[i];
+ smrs[idx].mask = 0; /* We don't currently share SMRs */
}
+ if (!smrs)
+ return 0;
+
/* It worked! Now, poke the actual hardware */
- for (i = 0; i < cfg->num_streamids; ++i) {
- u32 reg = SMR_VALID | smrs[i].id << SMR_ID_SHIFT |
- smrs[i].mask << SMR_MASK_SHIFT;
- writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_SMR(smrs[i].idx));
- }
+ for (i = 0; i < cfg->num_streamids; ++i)
+ arm_smmu_write_smr(smmu, cfg->smendx[i]);
- cfg->smrs = smrs;
return 0;
err_free_smrs:
- while (--i >= 0)
- __arm_smmu_free_bitmap(smmu->smr_map, smrs[i].idx);
- kfree(smrs);
+ while (i--) {
+ arm_smmu_free_smr(smmu, cfg->smendx[i]);
+ cfg->smendx[i] = INVALID_SMENDX;
+ }
return -ENOSPC;
}
-static void arm_smmu_master_free_smrs(struct arm_smmu_device *smmu,
+static void arm_smmu_master_free_smes(struct arm_smmu_device *smmu,
struct arm_smmu_master_cfg *cfg)
{
int i;
- void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
- struct arm_smmu_smr *smrs = cfg->smrs;
-
- if (!smrs)
- return;
/* Invalidate the SMRs before freeing back to the allocator */
for (i = 0; i < cfg->num_streamids; ++i) {
- u8 idx = smrs[i].idx;
+ if (smmu->smrs)
+ arm_smmu_free_smr(smmu, cfg->smendx[i]);
- writel_relaxed(~SMR_VALID, gr0_base + ARM_SMMU_GR0_SMR(idx));
- __arm_smmu_free_bitmap(smmu->smr_map, idx);
+ cfg->smendx[i] = INVALID_SMENDX;
}
-
- cfg->smrs = NULL;
- kfree(smrs);
}
static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
@@ -1172,14 +1184,14 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
return 0;
/* Devices in an IOMMU group may already be configured */
- ret = arm_smmu_master_configure_smrs(smmu, cfg);
+ ret = arm_smmu_master_alloc_smes(smmu, cfg);
if (ret)
return ret == -EEXIST ? 0 : ret;
for (i = 0; i < cfg->num_streamids; ++i) {
u32 idx, s2cr;
- idx = cfg->smrs ? cfg->smrs[i].idx : cfg->streamids[i];
+ idx = cfg->smendx[i];
s2cr = S2CR_TYPE_TRANS | S2CR_PRIVCFG_UNPRIV |
(smmu_domain->cfg.cbndx << S2CR_CBNDX_SHIFT);
writel_relaxed(s2cr, gr0_base + ARM_SMMU_GR0_S2CR(idx));
@@ -1195,22 +1207,22 @@ static void arm_smmu_domain_remove_master(struct arm_smmu_domain *smmu_domain,
struct arm_smmu_device *smmu = smmu_domain->smmu;
void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
- /* An IOMMU group is torn down by the first device to be removed */
- if ((smmu->features & ARM_SMMU_FEAT_STREAM_MATCH) && !cfg->smrs)
- return;
-
/*
* We *must* clear the S2CR first, because freeing the SMR means
* that it can be re-allocated immediately.
*/
for (i = 0; i < cfg->num_streamids; ++i) {
- u32 idx = cfg->smrs ? cfg->smrs[i].idx : cfg->streamids[i];
+ int idx = cfg->smendx[i];
u32 reg = disable_bypass ? S2CR_TYPE_FAULT : S2CR_TYPE_BYPASS;
+ /* An IOMMU group is torn down by the first device to be removed */
+ if (idx == INVALID_SMENDX)
+ return;
+
writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_S2CR(idx));
}
- arm_smmu_master_free_smrs(smmu, cfg);
+ arm_smmu_master_free_smes(smmu, cfg);
}
static void arm_smmu_detach_dev(struct device *dev,
@@ -1424,8 +1436,11 @@ static int arm_smmu_init_pci_device(struct pci_dev *pdev,
break;
/* Avoid duplicate SIDs, as this can lead to SMR conflicts */
- if (i == cfg->num_streamids)
- cfg->streamids[cfg->num_streamids++] = sid;
+ if (i == cfg->num_streamids) {
+ cfg->streamids[i] = sid;
+ cfg->smendx[i] = INVALID_SMENDX;
+ cfg->num_streamids++;
+ }
return 0;
}
@@ -1556,17 +1571,21 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
{
void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
void __iomem *cb_base;
- int i = 0;
+ int i;
u32 reg, major;
/* clear global FSR */
reg = readl_relaxed(ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sGFSR);
writel(reg, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sGFSR);
- /* Mark all SMRn as invalid and all S2CRn as bypass unless overridden */
+ /*
+ * Reset stream mapping groups: Initial values mark all SMRn as
+ * invalid and all S2CRn as bypass unless overridden.
+ */
reg = disable_bypass ? S2CR_TYPE_FAULT : S2CR_TYPE_BYPASS;
for (i = 0; i < smmu->num_mapping_groups; ++i) {
- writel_relaxed(0, gr0_base + ARM_SMMU_GR0_SMR(i));
+ if (smmu->smrs)
+ arm_smmu_write_smr(smmu, i);
writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_S2CR(i));
}
@@ -1744,6 +1763,12 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
smr = readl_relaxed(gr0_base + ARM_SMMU_GR0_SMR(0));
smmu->smr_mask_mask = smr >> SMR_MASK_SHIFT;
+ /* Zero-initialised to mark as invalid */
+ smmu->smrs = devm_kcalloc(smmu->dev, size, sizeof(*smmu->smrs),
+ GFP_KERNEL);
+ if (!smmu->smrs)
+ return -ENOMEM;
+
dev_notice(smmu->dev,
"\tstream matching with %lu register groups, mask 0x%x",
size, smmu->smr_mask_mask);
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 10/20] iommu/arm-smmu: Keep track of S2CR state
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
Making S2CRs first-class citizens within the driver with a high-level
representation of their state offers a neat solution to a few problems:
Firstly, the information about which context a device's stream IDs are
associated with is already present by necessity in the S2CR. With that
state easily accessible we can refer directly to it and obviate the need
to track an IOMMU domain in each device's archdata (its earlier purpose
of enforcing correct attachment of multi-device groups now being handled
by the IOMMU core itself).
Secondly, the core API now deprecates explicit domain detach and expects
domain attach to move devices smoothly from one domain to another; for
SMMUv2, this notion maps directly to simply rewriting the S2CRs assigned
to the device. By giving the driver a suitable abstraction of those
S2CRs to work with, we can massively reduce the overhead of the current
heavy-handed "detach, free resources, reallocate resources, attach"
approach.
Thirdly, making the software state hardware-shaped and attached to the
SMMU instance once again makes suspend/resume of this register group
that much simpler to implement in future.
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
- Make INVALID_SMENDX checks explicit
---
drivers/iommu/arm-smmu.c | 159 +++++++++++++++++++++++++++--------------------
1 file changed, 93 insertions(+), 66 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index dfe13780ba54..69b6cab65421 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -170,12 +170,20 @@
#define S2CR_CBNDX_MASK 0xff
#define S2CR_TYPE_SHIFT 16
#define S2CR_TYPE_MASK 0x3
-#define S2CR_TYPE_TRANS (0 << S2CR_TYPE_SHIFT)
-#define S2CR_TYPE_BYPASS (1 << S2CR_TYPE_SHIFT)
-#define S2CR_TYPE_FAULT (2 << S2CR_TYPE_SHIFT)
+enum arm_smmu_s2cr_type {
+ S2CR_TYPE_TRANS,
+ S2CR_TYPE_BYPASS,
+ S2CR_TYPE_FAULT,
+};
#define S2CR_PRIVCFG_SHIFT 24
-#define S2CR_PRIVCFG_UNPRIV (2 << S2CR_PRIVCFG_SHIFT)
+#define S2CR_PRIVCFG_MASK 0x3
+enum arm_smmu_s2cr_privcfg {
+ S2CR_PRIVCFG_DEFAULT,
+ S2CR_PRIVCFG_DIPAN,
+ S2CR_PRIVCFG_UNPRIV,
+ S2CR_PRIVCFG_PRIV,
+};
/* Context bank attribute registers */
#define ARM_SMMU_GR1_CBAR(n) (0x0 + ((n) << 2))
@@ -292,6 +300,16 @@ enum arm_smmu_implementation {
CAVIUM_SMMUV2,
};
+struct arm_smmu_s2cr {
+ enum arm_smmu_s2cr_type type;
+ enum arm_smmu_s2cr_privcfg privcfg;
+ u8 cbndx;
+};
+
+#define s2cr_init_val (struct arm_smmu_s2cr){ \
+ .type = disable_bypass ? S2CR_TYPE_FAULT : S2CR_TYPE_BYPASS, \
+}
+
struct arm_smmu_smr {
u16 mask;
u16 id;
@@ -346,6 +364,7 @@ struct arm_smmu_device {
u16 streamid_mask;
u16 smr_mask_mask;
struct arm_smmu_smr *smrs;
+ struct arm_smmu_s2cr *s2crs;
unsigned long va_size;
unsigned long ipa_size;
@@ -1108,6 +1127,23 @@ static void arm_smmu_write_smr(struct arm_smmu_device *smmu, int idx)
writel_relaxed(reg, ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_SMR(idx));
}
+static void arm_smmu_write_s2cr(struct arm_smmu_device *smmu, int idx)
+{
+ struct arm_smmu_s2cr *s2cr = smmu->s2crs + idx;
+ u32 reg = (s2cr->type & S2CR_TYPE_MASK) << S2CR_TYPE_SHIFT |
+ (s2cr->cbndx & S2CR_CBNDX_MASK) << S2CR_CBNDX_SHIFT |
+ (s2cr->privcfg & S2CR_PRIVCFG_MASK) << S2CR_PRIVCFG_SHIFT;
+
+ writel_relaxed(reg, ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_S2CR(idx));
+}
+
+static void arm_smmu_write_sme(struct arm_smmu_device *smmu, int idx)
+{
+ arm_smmu_write_s2cr(smmu, idx);
+ if (smmu->smrs)
+ arm_smmu_write_smr(smmu, idx);
+}
+
static int arm_smmu_master_alloc_smes(struct arm_smmu_device *smmu,
struct arm_smmu_master_cfg *cfg)
{
@@ -1158,6 +1194,23 @@ static void arm_smmu_master_free_smes(struct arm_smmu_device *smmu,
{
int i;
+ /*
+ * We *must* clear the S2CR first, because freeing the SMR means
+ * that it can be re-allocated immediately.
+ */
+ for (i = 0; i < cfg->num_streamids; ++i) {
+ int idx = cfg->smendx[i];
+
+ /* An IOMMU group is torn down by the first device to be removed */
+ if (idx == INVALID_SMENDX)
+ return;
+
+ smmu->s2crs[idx] = s2cr_init_val;
+ arm_smmu_write_s2cr(smmu, idx);
+ }
+ /* Sync S2CR updates before touching anything else */
+ __iowmb();
+
/* Invalidate the SMRs before freeing back to the allocator */
for (i = 0; i < cfg->num_streamids; ++i) {
if (smmu->smrs)
@@ -1170,9 +1223,16 @@ static void arm_smmu_master_free_smes(struct arm_smmu_device *smmu,
static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
struct arm_smmu_master_cfg *cfg)
{
- int i, ret;
+ int i, ret = 0;
struct arm_smmu_device *smmu = smmu_domain->smmu;
- void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
+ struct arm_smmu_s2cr *s2cr = smmu->s2crs;
+ enum arm_smmu_s2cr_type type = S2CR_TYPE_TRANS;
+ u8 cbndx = smmu_domain->cfg.cbndx;
+
+ if (cfg->smendx[0] == INVALID_SMENDX)
+ ret = arm_smmu_master_alloc_smes(smmu, cfg);
+ if (ret)
+ return ret;
/*
* FIXME: This won't be needed once we have IOMMU-backed DMA ops
@@ -1181,58 +1241,21 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
* and a PCI device (i.e. a PCI host controller)
*/
if (smmu_domain->domain.type == IOMMU_DOMAIN_DMA)
- return 0;
+ type = S2CR_TYPE_BYPASS;
- /* Devices in an IOMMU group may already be configured */
- ret = arm_smmu_master_alloc_smes(smmu, cfg);
- if (ret)
- return ret == -EEXIST ? 0 : ret;
-
- for (i = 0; i < cfg->num_streamids; ++i) {
- u32 idx, s2cr;
-
- idx = cfg->smendx[i];
- s2cr = S2CR_TYPE_TRANS | S2CR_PRIVCFG_UNPRIV |
- (smmu_domain->cfg.cbndx << S2CR_CBNDX_SHIFT);
- writel_relaxed(s2cr, gr0_base + ARM_SMMU_GR0_S2CR(idx));
- }
-
- return 0;
-}
-
-static void arm_smmu_domain_remove_master(struct arm_smmu_domain *smmu_domain,
- struct arm_smmu_master_cfg *cfg)
-{
- int i;
- struct arm_smmu_device *smmu = smmu_domain->smmu;
- void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
-
- /*
- * We *must* clear the S2CR first, because freeing the SMR means
- * that it can be re-allocated immediately.
- */
for (i = 0; i < cfg->num_streamids; ++i) {
int idx = cfg->smendx[i];
- u32 reg = disable_bypass ? S2CR_TYPE_FAULT : S2CR_TYPE_BYPASS;
- /* An IOMMU group is torn down by the first device to be removed */
- if (idx == INVALID_SMENDX)
- return;
+ /* Devices in an IOMMU group may already be configured */
+ if (type == s2cr[idx].type && cbndx == s2cr[idx].cbndx)
+ break;
- writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_S2CR(idx));
+ s2cr[idx].type = type;
+ s2cr[idx].privcfg = S2CR_PRIVCFG_UNPRIV;
+ s2cr[idx].cbndx = cbndx;
+ arm_smmu_write_s2cr(smmu, idx);
}
-
- arm_smmu_master_free_smes(smmu, cfg);
-}
-
-static void arm_smmu_detach_dev(struct device *dev,
- struct arm_smmu_master_cfg *cfg)
-{
- struct iommu_domain *domain = dev->archdata.iommu;
- struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
-
- dev->archdata.iommu = NULL;
- arm_smmu_domain_remove_master(smmu_domain, cfg);
+ return 0;
}
static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
@@ -1269,14 +1292,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
if (!cfg)
return -ENODEV;
- /* Detach the dev from its current domain */
- if (dev->archdata.iommu)
- arm_smmu_detach_dev(dev, cfg);
-
- ret = arm_smmu_domain_add_master(smmu_domain, cfg);
- if (!ret)
- dev->archdata.iommu = domain;
- return ret;
+ return arm_smmu_domain_add_master(smmu_domain, cfg);
}
static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
@@ -1477,6 +1493,12 @@ static int arm_smmu_add_device(struct device *dev)
static void arm_smmu_remove_device(struct device *dev)
{
+ struct arm_smmu_device *smmu = find_smmu_for_device(dev);
+ struct arm_smmu_master_cfg *cfg = find_smmu_master_cfg(dev);
+
+ if (smmu && cfg)
+ arm_smmu_master_free_smes(smmu, cfg);
+
iommu_group_remove_device(dev);
}
@@ -1582,12 +1604,8 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
* Reset stream mapping groups: Initial values mark all SMRn as
* invalid and all S2CRn as bypass unless overridden.
*/
- reg = disable_bypass ? S2CR_TYPE_FAULT : S2CR_TYPE_BYPASS;
- for (i = 0; i < smmu->num_mapping_groups; ++i) {
- if (smmu->smrs)
- arm_smmu_write_smr(smmu, i);
- writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_S2CR(i));
- }
+ for (i = 0; i < smmu->num_mapping_groups; ++i)
+ arm_smmu_write_sme(smmu, i);
/*
* Before clearing ARM_MMU500_ACTLR_CPRE, need to
@@ -1676,6 +1694,7 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
u32 id;
bool cttw_dt, cttw_reg;
+ int i;
dev_notice(smmu->dev, "probing hardware configuration...\n");
dev_notice(smmu->dev, "SMMUv%d with:\n",
@@ -1773,6 +1792,14 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
"\tstream matching with %lu register groups, mask 0x%x",
size, smmu->smr_mask_mask);
}
+ /* s2cr->type == 0 means translation, so initialise explicitly */
+ smmu->s2crs = devm_kmalloc_array(smmu->dev, size, sizeof(*smmu->s2crs),
+ GFP_KERNEL);
+ if (!smmu->s2crs)
+ return -ENOMEM;
+ for (i = 0; i < size; i++)
+ smmu->s2crs[i] = s2cr_init_val;
+
smmu->num_mapping_groups = size;
if (smmu->version < ARM_SMMU_V2 || !(id & ID0_PTFS_NO_AARCH32)) {
--
2.8.1.dirty
--
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^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 10/20] iommu/arm-smmu: Keep track of S2CR state
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
Making S2CRs first-class citizens within the driver with a high-level
representation of their state offers a neat solution to a few problems:
Firstly, the information about which context a device's stream IDs are
associated with is already present by necessity in the S2CR. With that
state easily accessible we can refer directly to it and obviate the need
to track an IOMMU domain in each device's archdata (its earlier purpose
of enforcing correct attachment of multi-device groups now being handled
by the IOMMU core itself).
Secondly, the core API now deprecates explicit domain detach and expects
domain attach to move devices smoothly from one domain to another; for
SMMUv2, this notion maps directly to simply rewriting the S2CRs assigned
to the device. By giving the driver a suitable abstraction of those
S2CRs to work with, we can massively reduce the overhead of the current
heavy-handed "detach, free resources, reallocate resources, attach"
approach.
Thirdly, making the software state hardware-shaped and attached to the
SMMU instance once again makes suspend/resume of this register group
that much simpler to implement in future.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
- Make INVALID_SMENDX checks explicit
---
drivers/iommu/arm-smmu.c | 159 +++++++++++++++++++++++++++--------------------
1 file changed, 93 insertions(+), 66 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index dfe13780ba54..69b6cab65421 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -170,12 +170,20 @@
#define S2CR_CBNDX_MASK 0xff
#define S2CR_TYPE_SHIFT 16
#define S2CR_TYPE_MASK 0x3
-#define S2CR_TYPE_TRANS (0 << S2CR_TYPE_SHIFT)
-#define S2CR_TYPE_BYPASS (1 << S2CR_TYPE_SHIFT)
-#define S2CR_TYPE_FAULT (2 << S2CR_TYPE_SHIFT)
+enum arm_smmu_s2cr_type {
+ S2CR_TYPE_TRANS,
+ S2CR_TYPE_BYPASS,
+ S2CR_TYPE_FAULT,
+};
#define S2CR_PRIVCFG_SHIFT 24
-#define S2CR_PRIVCFG_UNPRIV (2 << S2CR_PRIVCFG_SHIFT)
+#define S2CR_PRIVCFG_MASK 0x3
+enum arm_smmu_s2cr_privcfg {
+ S2CR_PRIVCFG_DEFAULT,
+ S2CR_PRIVCFG_DIPAN,
+ S2CR_PRIVCFG_UNPRIV,
+ S2CR_PRIVCFG_PRIV,
+};
/* Context bank attribute registers */
#define ARM_SMMU_GR1_CBAR(n) (0x0 + ((n) << 2))
@@ -292,6 +300,16 @@ enum arm_smmu_implementation {
CAVIUM_SMMUV2,
};
+struct arm_smmu_s2cr {
+ enum arm_smmu_s2cr_type type;
+ enum arm_smmu_s2cr_privcfg privcfg;
+ u8 cbndx;
+};
+
+#define s2cr_init_val (struct arm_smmu_s2cr){ \
+ .type = disable_bypass ? S2CR_TYPE_FAULT : S2CR_TYPE_BYPASS, \
+}
+
struct arm_smmu_smr {
u16 mask;
u16 id;
@@ -346,6 +364,7 @@ struct arm_smmu_device {
u16 streamid_mask;
u16 smr_mask_mask;
struct arm_smmu_smr *smrs;
+ struct arm_smmu_s2cr *s2crs;
unsigned long va_size;
unsigned long ipa_size;
@@ -1108,6 +1127,23 @@ static void arm_smmu_write_smr(struct arm_smmu_device *smmu, int idx)
writel_relaxed(reg, ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_SMR(idx));
}
+static void arm_smmu_write_s2cr(struct arm_smmu_device *smmu, int idx)
+{
+ struct arm_smmu_s2cr *s2cr = smmu->s2crs + idx;
+ u32 reg = (s2cr->type & S2CR_TYPE_MASK) << S2CR_TYPE_SHIFT |
+ (s2cr->cbndx & S2CR_CBNDX_MASK) << S2CR_CBNDX_SHIFT |
+ (s2cr->privcfg & S2CR_PRIVCFG_MASK) << S2CR_PRIVCFG_SHIFT;
+
+ writel_relaxed(reg, ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_S2CR(idx));
+}
+
+static void arm_smmu_write_sme(struct arm_smmu_device *smmu, int idx)
+{
+ arm_smmu_write_s2cr(smmu, idx);
+ if (smmu->smrs)
+ arm_smmu_write_smr(smmu, idx);
+}
+
static int arm_smmu_master_alloc_smes(struct arm_smmu_device *smmu,
struct arm_smmu_master_cfg *cfg)
{
@@ -1158,6 +1194,23 @@ static void arm_smmu_master_free_smes(struct arm_smmu_device *smmu,
{
int i;
+ /*
+ * We *must* clear the S2CR first, because freeing the SMR means
+ * that it can be re-allocated immediately.
+ */
+ for (i = 0; i < cfg->num_streamids; ++i) {
+ int idx = cfg->smendx[i];
+
+ /* An IOMMU group is torn down by the first device to be removed */
+ if (idx == INVALID_SMENDX)
+ return;
+
+ smmu->s2crs[idx] = s2cr_init_val;
+ arm_smmu_write_s2cr(smmu, idx);
+ }
+ /* Sync S2CR updates before touching anything else */
+ __iowmb();
+
/* Invalidate the SMRs before freeing back to the allocator */
for (i = 0; i < cfg->num_streamids; ++i) {
if (smmu->smrs)
@@ -1170,9 +1223,16 @@ static void arm_smmu_master_free_smes(struct arm_smmu_device *smmu,
static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
struct arm_smmu_master_cfg *cfg)
{
- int i, ret;
+ int i, ret = 0;
struct arm_smmu_device *smmu = smmu_domain->smmu;
- void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
+ struct arm_smmu_s2cr *s2cr = smmu->s2crs;
+ enum arm_smmu_s2cr_type type = S2CR_TYPE_TRANS;
+ u8 cbndx = smmu_domain->cfg.cbndx;
+
+ if (cfg->smendx[0] == INVALID_SMENDX)
+ ret = arm_smmu_master_alloc_smes(smmu, cfg);
+ if (ret)
+ return ret;
/*
* FIXME: This won't be needed once we have IOMMU-backed DMA ops
@@ -1181,58 +1241,21 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
* and a PCI device (i.e. a PCI host controller)
*/
if (smmu_domain->domain.type == IOMMU_DOMAIN_DMA)
- return 0;
+ type = S2CR_TYPE_BYPASS;
- /* Devices in an IOMMU group may already be configured */
- ret = arm_smmu_master_alloc_smes(smmu, cfg);
- if (ret)
- return ret == -EEXIST ? 0 : ret;
-
- for (i = 0; i < cfg->num_streamids; ++i) {
- u32 idx, s2cr;
-
- idx = cfg->smendx[i];
- s2cr = S2CR_TYPE_TRANS | S2CR_PRIVCFG_UNPRIV |
- (smmu_domain->cfg.cbndx << S2CR_CBNDX_SHIFT);
- writel_relaxed(s2cr, gr0_base + ARM_SMMU_GR0_S2CR(idx));
- }
-
- return 0;
-}
-
-static void arm_smmu_domain_remove_master(struct arm_smmu_domain *smmu_domain,
- struct arm_smmu_master_cfg *cfg)
-{
- int i;
- struct arm_smmu_device *smmu = smmu_domain->smmu;
- void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
-
- /*
- * We *must* clear the S2CR first, because freeing the SMR means
- * that it can be re-allocated immediately.
- */
for (i = 0; i < cfg->num_streamids; ++i) {
int idx = cfg->smendx[i];
- u32 reg = disable_bypass ? S2CR_TYPE_FAULT : S2CR_TYPE_BYPASS;
- /* An IOMMU group is torn down by the first device to be removed */
- if (idx == INVALID_SMENDX)
- return;
+ /* Devices in an IOMMU group may already be configured */
+ if (type == s2cr[idx].type && cbndx == s2cr[idx].cbndx)
+ break;
- writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_S2CR(idx));
+ s2cr[idx].type = type;
+ s2cr[idx].privcfg = S2CR_PRIVCFG_UNPRIV;
+ s2cr[idx].cbndx = cbndx;
+ arm_smmu_write_s2cr(smmu, idx);
}
-
- arm_smmu_master_free_smes(smmu, cfg);
-}
-
-static void arm_smmu_detach_dev(struct device *dev,
- struct arm_smmu_master_cfg *cfg)
-{
- struct iommu_domain *domain = dev->archdata.iommu;
- struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
-
- dev->archdata.iommu = NULL;
- arm_smmu_domain_remove_master(smmu_domain, cfg);
+ return 0;
}
static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
@@ -1269,14 +1292,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
if (!cfg)
return -ENODEV;
- /* Detach the dev from its current domain */
- if (dev->archdata.iommu)
- arm_smmu_detach_dev(dev, cfg);
-
- ret = arm_smmu_domain_add_master(smmu_domain, cfg);
- if (!ret)
- dev->archdata.iommu = domain;
- return ret;
+ return arm_smmu_domain_add_master(smmu_domain, cfg);
}
static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
@@ -1477,6 +1493,12 @@ static int arm_smmu_add_device(struct device *dev)
static void arm_smmu_remove_device(struct device *dev)
{
+ struct arm_smmu_device *smmu = find_smmu_for_device(dev);
+ struct arm_smmu_master_cfg *cfg = find_smmu_master_cfg(dev);
+
+ if (smmu && cfg)
+ arm_smmu_master_free_smes(smmu, cfg);
+
iommu_group_remove_device(dev);
}
@@ -1582,12 +1604,8 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
* Reset stream mapping groups: Initial values mark all SMRn as
* invalid and all S2CRn as bypass unless overridden.
*/
- reg = disable_bypass ? S2CR_TYPE_FAULT : S2CR_TYPE_BYPASS;
- for (i = 0; i < smmu->num_mapping_groups; ++i) {
- if (smmu->smrs)
- arm_smmu_write_smr(smmu, i);
- writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_S2CR(i));
- }
+ for (i = 0; i < smmu->num_mapping_groups; ++i)
+ arm_smmu_write_sme(smmu, i);
/*
* Before clearing ARM_MMU500_ACTLR_CPRE, need to
@@ -1676,6 +1694,7 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
u32 id;
bool cttw_dt, cttw_reg;
+ int i;
dev_notice(smmu->dev, "probing hardware configuration...\n");
dev_notice(smmu->dev, "SMMUv%d with:\n",
@@ -1773,6 +1792,14 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
"\tstream matching with %lu register groups, mask 0x%x",
size, smmu->smr_mask_mask);
}
+ /* s2cr->type == 0 means translation, so initialise explicitly */
+ smmu->s2crs = devm_kmalloc_array(smmu->dev, size, sizeof(*smmu->s2crs),
+ GFP_KERNEL);
+ if (!smmu->s2crs)
+ return -ENOMEM;
+ for (i = 0; i < size; i++)
+ smmu->s2crs[i] = s2cr_init_val;
+
smmu->num_mapping_groups = size;
if (smmu->version < ARM_SMMU_V2 || !(id & ID0_PTFS_NO_AARCH32)) {
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 11/20] iommu/arm-smmu: Refactor mmu-masters handling
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
To be able to support the generic bindings and handle of_xlate() calls,
we need to be able to associate SMMUs and stream IDs directly with
devices *before* allocating IOMMU groups. Furthermore, to support real
default domains with multi-device groups we also have to handle domain
attach on a per-device basis, as the "whole group at a time" assumption
fails to properly handle subsequent devices added to a group after the
first has already triggered default domain creation and attachment.
To that end, use the now-vacant dev->archdata.iommu field for easy
config and SMMU instance lookup, and unify config management by chopping
down the platform-device-specific tree and probing the "mmu-masters"
property on-demand instead. This may add a bit of one-off overhead to
initially adding a new device, but we're about to deprecate that binding
in favour of the inherently-more-efficient generic ones anyway.
For the sake of simplicity, this patch does temporarily regress the case
of aliasing PCI devices by losing the duplicate stream ID detection that
the previous per-group config had. Stay tuned, because we'll be back to
fix that in a better and more general way momentarily...
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
drivers/iommu/arm-smmu.c | 382 +++++++++++++----------------------------------
1 file changed, 107 insertions(+), 275 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 69b6cab65421..0a628f2c9297 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -317,18 +317,13 @@ struct arm_smmu_smr {
};
struct arm_smmu_master_cfg {
+ struct arm_smmu_device *smmu;
int num_streamids;
u16 streamids[MAX_MASTER_STREAMIDS];
s16 smendx[MAX_MASTER_STREAMIDS];
};
#define INVALID_SMENDX -1
-struct arm_smmu_master {
- struct device_node *of_node;
- struct rb_node node;
- struct arm_smmu_master_cfg cfg;
-};
-
struct arm_smmu_device {
struct device *dev;
@@ -376,7 +371,6 @@ struct arm_smmu_device {
unsigned int *irqs;
struct list_head list;
- struct rb_root masters;
u32 cavium_id_base; /* Specific to Cavium */
};
@@ -415,12 +409,6 @@ struct arm_smmu_domain {
struct iommu_domain domain;
};
-struct arm_smmu_phandle_args {
- struct device_node *np;
- int args_count;
- uint32_t args[MAX_MASTER_STREAMIDS];
-};
-
static DEFINE_SPINLOCK(arm_smmu_devices_lock);
static LIST_HEAD(arm_smmu_devices);
@@ -462,132 +450,89 @@ static struct device_node *dev_get_dev_node(struct device *dev)
while (!pci_is_root_bus(bus))
bus = bus->parent;
- return bus->bridge->parent->of_node;
+ return of_node_get(bus->bridge->parent->of_node);
}
- return dev->of_node;
+ return of_node_get(dev->of_node);
}
-static struct arm_smmu_master *find_smmu_master(struct arm_smmu_device *smmu,
- struct device_node *dev_node)
+static int __arm_smmu_get_pci_sid(struct pci_dev *pdev, u16 alias, void *data)
{
- struct rb_node *node = smmu->masters.rb_node;
-
- while (node) {
- struct arm_smmu_master *master;
-
- master = container_of(node, struct arm_smmu_master, node);
-
- if (dev_node < master->of_node)
- node = node->rb_left;
- else if (dev_node > master->of_node)
- node = node->rb_right;
- else
- return master;
- }
-
- return NULL;
+ *((__be32 *)data) = cpu_to_be32(alias);
+ return 0; /* Continue walking */
}
-static struct arm_smmu_master_cfg *
-find_smmu_master_cfg(struct device *dev)
+static int __find_legacy_master_phandle(struct device *dev, void *data)
{
- struct arm_smmu_master_cfg *cfg = NULL;
- struct iommu_group *group = iommu_group_get(dev);
+ struct of_phandle_iterator *it = *(void **)data;
+ struct device_node *np = it->node;
+ int err;
- if (group) {
- cfg = iommu_group_get_iommudata(group);
- iommu_group_put(group);
- }
-
- return cfg;
-}
-
-static int insert_smmu_master(struct arm_smmu_device *smmu,
- struct arm_smmu_master *master)
-{
- struct rb_node **new, *parent;
-
- new = &smmu->masters.rb_node;
- parent = NULL;
- while (*new) {
- struct arm_smmu_master *this
- = container_of(*new, struct arm_smmu_master, node);
-
- parent = *new;
- if (master->of_node < this->of_node)
- new = &((*new)->rb_left);
- else if (master->of_node > this->of_node)
- new = &((*new)->rb_right);
- else
- return -EEXIST;
- }
-
- rb_link_node(&master->node, parent, new);
- rb_insert_color(&master->node, &smmu->masters);
- return 0;
-}
-
-static int register_smmu_master(struct arm_smmu_device *smmu,
- struct device *dev,
- struct arm_smmu_phandle_args *masterspec)
-{
- int i;
- struct arm_smmu_master *master;
-
- master = find_smmu_master(smmu, masterspec->np);
- if (master) {
- dev_err(dev,
- "rejecting multiple registrations for master device %s\n",
- masterspec->np->name);
- return -EBUSY;
- }
-
- if (masterspec->args_count > MAX_MASTER_STREAMIDS) {
- dev_err(dev,
- "reached maximum number (%d) of stream IDs for master device %s\n",
- MAX_MASTER_STREAMIDS, masterspec->np->name);
- return -ENOSPC;
- }
-
- master = devm_kzalloc(dev, sizeof(*master), GFP_KERNEL);
- if (!master)
- return -ENOMEM;
-
- master->of_node = masterspec->np;
- master->cfg.num_streamids = masterspec->args_count;
-
- for (i = 0; i < master->cfg.num_streamids; ++i) {
- u16 streamid = masterspec->args[i];
-
- if (!(smmu->features & ARM_SMMU_FEAT_STREAM_MATCH) &&
- (streamid >= smmu->num_mapping_groups)) {
- dev_err(dev,
- "stream ID for master device %s greater than maximum allowed (%d)\n",
- masterspec->np->name, smmu->num_mapping_groups);
- return -ERANGE;
+ of_for_each_phandle(it, err, dev->of_node, "mmu-masters",
+ "#stream-id-cells", 0)
+ if (it->node == np) {
+ *(void **)data = dev;
+ return 1;
}
- master->cfg.streamids[i] = streamid;
- master->cfg.smendx[i] = INVALID_SMENDX;
- }
- return insert_smmu_master(smmu, master);
+ it->node = np;
+ return err;
}
-static struct arm_smmu_device *find_smmu_for_device(struct device *dev)
+static int arm_smmu_register_legacy_master(struct device *dev)
{
struct arm_smmu_device *smmu;
- struct arm_smmu_master *master = NULL;
- struct device_node *dev_node = dev_get_dev_node(dev);
+ struct arm_smmu_master_cfg *cfg;
+ struct device_node *np;
+ struct of_phandle_iterator it;
+ void *data = ⁢
+ __be32 pci_sid;
+ int err;
+ np = dev_get_dev_node(dev);
+ if (!np || !of_find_property(np, "#stream-id-cells", NULL)) {
+ of_node_put(np);
+ return -ENODEV;
+ }
+
+ it.node = np;
spin_lock(&arm_smmu_devices_lock);
list_for_each_entry(smmu, &arm_smmu_devices, list) {
- master = find_smmu_master(smmu, dev_node);
- if (master)
+ err = __find_legacy_master_phandle(smmu->dev, &data);
+ if (err)
break;
}
spin_unlock(&arm_smmu_devices_lock);
+ of_node_put(np);
+ if (err == 0)
+ return -ENODEV;
+ if (err < 0)
+ return err;
- return master ? smmu : NULL;
+ if (it.cur_count > MAX_MASTER_STREAMIDS) {
+ dev_err(smmu->dev,
+ "reached maximum number (%d) of stream IDs for master device %s\n",
+ MAX_MASTER_STREAMIDS, dev_name(dev));
+ return -ENOSPC;
+ }
+ if (dev_is_pci(dev)) {
+ /* "mmu-masters" assumes Stream ID == Requester ID */
+ pci_for_each_dma_alias(to_pci_dev(dev), __arm_smmu_get_pci_sid,
+ &pci_sid);
+ it.cur = &pci_sid;
+ it.cur_count = 1;
+ }
+
+ cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
+ if (!cfg)
+ return -ENOMEM;
+
+ cfg->smmu = smmu;
+ dev->archdata.iommu = cfg;
+
+ while (it.cur_count--)
+ cfg->streamids[cfg->num_streamids++] = be32_to_cpup(it.cur++);
+
+ return 0;
}
static int __arm_smmu_alloc_bitmap(unsigned long *map, int start, int end)
@@ -1119,8 +1064,7 @@ static void arm_smmu_free_smr(struct arm_smmu_device *smmu, int idx)
static void arm_smmu_write_smr(struct arm_smmu_device *smmu, int idx)
{
struct arm_smmu_smr *smr = smmu->smrs + idx;
- u32 reg = (smr->id & smmu->streamid_mask) << SMR_ID_SHIFT |
- (smr->mask & smmu->smr_mask_mask) << SMR_MASK_SHIFT;
+ u32 reg = smr->id << SMR_ID_SHIFT | smr->mask << SMR_MASK_SHIFT;
if (smr->valid)
reg |= SMR_VALID;
@@ -1189,9 +1133,9 @@ err_free_smrs:
return -ENOSPC;
}
-static void arm_smmu_master_free_smes(struct arm_smmu_device *smmu,
- struct arm_smmu_master_cfg *cfg)
+static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
{
+ struct arm_smmu_device *smmu = cfg->smmu;
int i;
/*
@@ -1262,17 +1206,15 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
{
int ret;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
- struct arm_smmu_device *smmu;
- struct arm_smmu_master_cfg *cfg;
+ struct arm_smmu_master_cfg *cfg = dev->archdata.iommu;
- smmu = find_smmu_for_device(dev);
- if (!smmu) {
+ if (!cfg) {
dev_err(dev, "cannot attach to SMMU, is it on the same bus?\n");
return -ENXIO;
}
/* Ensure that the domain is finalised */
- ret = arm_smmu_init_domain_context(domain, smmu);
+ ret = arm_smmu_init_domain_context(domain, cfg->smmu);
if (ret < 0)
return ret;
@@ -1280,18 +1222,14 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
* Sanity check the domain. We don't support domains across
* different SMMUs.
*/
- if (smmu_domain->smmu != smmu) {
+ if (smmu_domain->smmu != cfg->smmu) {
dev_err(dev,
"cannot attach to SMMU %s whilst already attached to domain on SMMU %s\n",
- dev_name(smmu_domain->smmu->dev), dev_name(smmu->dev));
+ dev_name(smmu_domain->smmu->dev), dev_name(cfg->smmu->dev));
return -EINVAL;
}
/* Looks ok, so add the device to the domain */
- cfg = find_smmu_master_cfg(dev);
- if (!cfg)
- return -ENODEV;
-
return arm_smmu_domain_add_master(smmu_domain, cfg);
}
@@ -1411,120 +1349,65 @@ static bool arm_smmu_capable(enum iommu_cap cap)
}
}
-static int __arm_smmu_get_pci_sid(struct pci_dev *pdev, u16 alias, void *data)
-{
- *((u16 *)data) = alias;
- return 0; /* Continue walking */
-}
-
-static void __arm_smmu_release_pci_iommudata(void *data)
-{
- kfree(data);
-}
-
-static int arm_smmu_init_pci_device(struct pci_dev *pdev,
- struct iommu_group *group)
-{
- struct arm_smmu_master_cfg *cfg;
- u16 sid;
- int i;
-
- cfg = iommu_group_get_iommudata(group);
- if (!cfg) {
- cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
- if (!cfg)
- return -ENOMEM;
-
- iommu_group_set_iommudata(group, cfg,
- __arm_smmu_release_pci_iommudata);
- }
-
- if (cfg->num_streamids >= MAX_MASTER_STREAMIDS)
- return -ENOSPC;
-
- /*
- * Assume Stream ID == Requester ID for now.
- * We need a way to describe the ID mappings in FDT.
- */
- pci_for_each_dma_alias(pdev, __arm_smmu_get_pci_sid, &sid);
- for (i = 0; i < cfg->num_streamids; ++i)
- if (cfg->streamids[i] == sid)
- break;
-
- /* Avoid duplicate SIDs, as this can lead to SMR conflicts */
- if (i == cfg->num_streamids) {
- cfg->streamids[i] = sid;
- cfg->smendx[i] = INVALID_SMENDX;
- cfg->num_streamids++;
- }
-
- return 0;
-}
-
-static int arm_smmu_init_platform_device(struct device *dev,
- struct iommu_group *group)
-{
- struct arm_smmu_device *smmu = find_smmu_for_device(dev);
- struct arm_smmu_master *master;
-
- if (!smmu)
- return -ENODEV;
-
- master = find_smmu_master(smmu, dev->of_node);
- if (!master)
- return -ENODEV;
-
- iommu_group_set_iommudata(group, &master->cfg, NULL);
-
- return 0;
-}
-
static int arm_smmu_add_device(struct device *dev)
{
+ struct arm_smmu_master_cfg *cfg;
struct iommu_group *group;
+ int i, ret;
+
+ ret = arm_smmu_register_legacy_master(dev);
+ cfg = dev->archdata.iommu;
+ if (ret)
+ goto out_free;
+
+ ret = -EINVAL;
+ for (i = 0; i < cfg->num_streamids; i++) {
+ u16 sid = cfg->streamids[i];
+
+ if (sid & ~cfg->smmu->streamid_mask) {
+ dev_err(dev, "stream ID 0x%x out of range for SMMU (0x%x)\n",
+ sid, cfg->smmu->streamid_mask);
+ goto out_free;
+ }
+ cfg->smendx[i] = INVALID_SMENDX;
+ }
group = iommu_group_get_for_dev(dev);
- if (IS_ERR(group))
- return PTR_ERR(group);
-
+ if (IS_ERR(group)) {
+ ret = PTR_ERR(group);
+ goto out_free;
+ }
iommu_group_put(group);
return 0;
+
+out_free:
+ kfree(cfg);
+ dev->archdata.iommu = NULL;
+ return ret;
}
static void arm_smmu_remove_device(struct device *dev)
{
- struct arm_smmu_device *smmu = find_smmu_for_device(dev);
- struct arm_smmu_master_cfg *cfg = find_smmu_master_cfg(dev);
+ struct arm_smmu_master_cfg *cfg = dev->archdata.iommu;
- if (smmu && cfg)
- arm_smmu_master_free_smes(smmu, cfg);
+ if (!cfg)
+ return;
+ arm_smmu_master_free_smes(cfg);
iommu_group_remove_device(dev);
+ kfree(cfg);
+ dev->archdata.iommu = NULL;
}
static struct iommu_group *arm_smmu_device_group(struct device *dev)
{
struct iommu_group *group;
- int ret;
if (dev_is_pci(dev))
group = pci_device_group(dev);
else
group = generic_device_group(dev);
- if (IS_ERR(group))
- return group;
-
- if (dev_is_pci(dev))
- ret = arm_smmu_init_pci_device(to_pci_dev(dev), group);
- else
- ret = arm_smmu_init_platform_device(dev, group);
-
- if (ret) {
- iommu_group_put(group);
- group = ERR_PTR(ret);
- }
-
return group;
}
@@ -1938,9 +1821,6 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
struct resource *res;
struct arm_smmu_device *smmu;
struct device *dev = &pdev->dev;
- struct rb_node *node;
- struct of_phandle_iterator it;
- struct arm_smmu_phandle_args *masterspec;
int num_irqs, i, err;
smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL);
@@ -2001,37 +1881,6 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
if (err)
return err;
- i = 0;
- smmu->masters = RB_ROOT;
-
- err = -ENOMEM;
- /* No need to zero the memory for masterspec */
- masterspec = kmalloc(sizeof(*masterspec), GFP_KERNEL);
- if (!masterspec)
- goto out_put_masters;
-
- of_for_each_phandle(&it, err, dev->of_node,
- "mmu-masters", "#stream-id-cells", 0) {
- int count = of_phandle_iterator_args(&it, masterspec->args,
- MAX_MASTER_STREAMIDS);
- masterspec->np = of_node_get(it.node);
- masterspec->args_count = count;
-
- err = register_smmu_master(smmu, dev, masterspec);
- if (err) {
- dev_err(dev, "failed to add master %s\n",
- masterspec->np->name);
- kfree(masterspec);
- goto out_put_masters;
- }
-
- i++;
- }
-
- dev_notice(dev, "registered %d master devices\n", i);
-
- kfree(masterspec);
-
parse_driver_options(smmu);
if (smmu->version == ARM_SMMU_V2 &&
@@ -2039,8 +1888,7 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
dev_err(dev,
"found only %d context interrupt(s) but %d required\n",
smmu->num_context_irqs, smmu->num_context_banks);
- err = -ENODEV;
- goto out_put_masters;
+ return -ENODEV;
}
for (i = 0; i < smmu->num_global_irqs; ++i) {
@@ -2052,7 +1900,7 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
if (err) {
dev_err(dev, "failed to request global IRQ %d (%u)\n",
i, smmu->irqs[i]);
- goto out_put_masters;
+ return err;
}
}
@@ -2063,22 +1911,12 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
arm_smmu_device_reset(smmu);
return 0;
-
-out_put_masters:
- for (node = rb_first(&smmu->masters); node; node = rb_next(node)) {
- struct arm_smmu_master *master
- = container_of(node, struct arm_smmu_master, node);
- of_node_put(master->of_node);
- }
-
- return err;
}
static int arm_smmu_device_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct arm_smmu_device *curr, *smmu = NULL;
- struct rb_node *node;
spin_lock(&arm_smmu_devices_lock);
list_for_each_entry(curr, &arm_smmu_devices, list) {
@@ -2093,12 +1931,6 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
if (!smmu)
return -ENODEV;
- for (node = rb_first(&smmu->masters); node; node = rb_next(node)) {
- struct arm_smmu_master *master
- = container_of(node, struct arm_smmu_master, node);
- of_node_put(master->of_node);
- }
-
if (!bitmap_empty(smmu->context_map, ARM_SMMU_MAX_CBS))
dev_err(dev, "removing device with active domains!\n");
--
2.8.1.dirty
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^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 11/20] iommu/arm-smmu: Refactor mmu-masters handling
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
To be able to support the generic bindings and handle of_xlate() calls,
we need to be able to associate SMMUs and stream IDs directly with
devices *before* allocating IOMMU groups. Furthermore, to support real
default domains with multi-device groups we also have to handle domain
attach on a per-device basis, as the "whole group at a time" assumption
fails to properly handle subsequent devices added to a group after the
first has already triggered default domain creation and attachment.
To that end, use the now-vacant dev->archdata.iommu field for easy
config and SMMU instance lookup, and unify config management by chopping
down the platform-device-specific tree and probing the "mmu-masters"
property on-demand instead. This may add a bit of one-off overhead to
initially adding a new device, but we're about to deprecate that binding
in favour of the inherently-more-efficient generic ones anyway.
For the sake of simplicity, this patch does temporarily regress the case
of aliasing PCI devices by losing the duplicate stream ID detection that
the previous per-group config had. Stay tuned, because we'll be back to
fix that in a better and more general way momentarily...
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/iommu/arm-smmu.c | 382 +++++++++++++----------------------------------
1 file changed, 107 insertions(+), 275 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 69b6cab65421..0a628f2c9297 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -317,18 +317,13 @@ struct arm_smmu_smr {
};
struct arm_smmu_master_cfg {
+ struct arm_smmu_device *smmu;
int num_streamids;
u16 streamids[MAX_MASTER_STREAMIDS];
s16 smendx[MAX_MASTER_STREAMIDS];
};
#define INVALID_SMENDX -1
-struct arm_smmu_master {
- struct device_node *of_node;
- struct rb_node node;
- struct arm_smmu_master_cfg cfg;
-};
-
struct arm_smmu_device {
struct device *dev;
@@ -376,7 +371,6 @@ struct arm_smmu_device {
unsigned int *irqs;
struct list_head list;
- struct rb_root masters;
u32 cavium_id_base; /* Specific to Cavium */
};
@@ -415,12 +409,6 @@ struct arm_smmu_domain {
struct iommu_domain domain;
};
-struct arm_smmu_phandle_args {
- struct device_node *np;
- int args_count;
- uint32_t args[MAX_MASTER_STREAMIDS];
-};
-
static DEFINE_SPINLOCK(arm_smmu_devices_lock);
static LIST_HEAD(arm_smmu_devices);
@@ -462,132 +450,89 @@ static struct device_node *dev_get_dev_node(struct device *dev)
while (!pci_is_root_bus(bus))
bus = bus->parent;
- return bus->bridge->parent->of_node;
+ return of_node_get(bus->bridge->parent->of_node);
}
- return dev->of_node;
+ return of_node_get(dev->of_node);
}
-static struct arm_smmu_master *find_smmu_master(struct arm_smmu_device *smmu,
- struct device_node *dev_node)
+static int __arm_smmu_get_pci_sid(struct pci_dev *pdev, u16 alias, void *data)
{
- struct rb_node *node = smmu->masters.rb_node;
-
- while (node) {
- struct arm_smmu_master *master;
-
- master = container_of(node, struct arm_smmu_master, node);
-
- if (dev_node < master->of_node)
- node = node->rb_left;
- else if (dev_node > master->of_node)
- node = node->rb_right;
- else
- return master;
- }
-
- return NULL;
+ *((__be32 *)data) = cpu_to_be32(alias);
+ return 0; /* Continue walking */
}
-static struct arm_smmu_master_cfg *
-find_smmu_master_cfg(struct device *dev)
+static int __find_legacy_master_phandle(struct device *dev, void *data)
{
- struct arm_smmu_master_cfg *cfg = NULL;
- struct iommu_group *group = iommu_group_get(dev);
+ struct of_phandle_iterator *it = *(void **)data;
+ struct device_node *np = it->node;
+ int err;
- if (group) {
- cfg = iommu_group_get_iommudata(group);
- iommu_group_put(group);
- }
-
- return cfg;
-}
-
-static int insert_smmu_master(struct arm_smmu_device *smmu,
- struct arm_smmu_master *master)
-{
- struct rb_node **new, *parent;
-
- new = &smmu->masters.rb_node;
- parent = NULL;
- while (*new) {
- struct arm_smmu_master *this
- = container_of(*new, struct arm_smmu_master, node);
-
- parent = *new;
- if (master->of_node < this->of_node)
- new = &((*new)->rb_left);
- else if (master->of_node > this->of_node)
- new = &((*new)->rb_right);
- else
- return -EEXIST;
- }
-
- rb_link_node(&master->node, parent, new);
- rb_insert_color(&master->node, &smmu->masters);
- return 0;
-}
-
-static int register_smmu_master(struct arm_smmu_device *smmu,
- struct device *dev,
- struct arm_smmu_phandle_args *masterspec)
-{
- int i;
- struct arm_smmu_master *master;
-
- master = find_smmu_master(smmu, masterspec->np);
- if (master) {
- dev_err(dev,
- "rejecting multiple registrations for master device %s\n",
- masterspec->np->name);
- return -EBUSY;
- }
-
- if (masterspec->args_count > MAX_MASTER_STREAMIDS) {
- dev_err(dev,
- "reached maximum number (%d) of stream IDs for master device %s\n",
- MAX_MASTER_STREAMIDS, masterspec->np->name);
- return -ENOSPC;
- }
-
- master = devm_kzalloc(dev, sizeof(*master), GFP_KERNEL);
- if (!master)
- return -ENOMEM;
-
- master->of_node = masterspec->np;
- master->cfg.num_streamids = masterspec->args_count;
-
- for (i = 0; i < master->cfg.num_streamids; ++i) {
- u16 streamid = masterspec->args[i];
-
- if (!(smmu->features & ARM_SMMU_FEAT_STREAM_MATCH) &&
- (streamid >= smmu->num_mapping_groups)) {
- dev_err(dev,
- "stream ID for master device %s greater than maximum allowed (%d)\n",
- masterspec->np->name, smmu->num_mapping_groups);
- return -ERANGE;
+ of_for_each_phandle(it, err, dev->of_node, "mmu-masters",
+ "#stream-id-cells", 0)
+ if (it->node == np) {
+ *(void **)data = dev;
+ return 1;
}
- master->cfg.streamids[i] = streamid;
- master->cfg.smendx[i] = INVALID_SMENDX;
- }
- return insert_smmu_master(smmu, master);
+ it->node = np;
+ return err;
}
-static struct arm_smmu_device *find_smmu_for_device(struct device *dev)
+static int arm_smmu_register_legacy_master(struct device *dev)
{
struct arm_smmu_device *smmu;
- struct arm_smmu_master *master = NULL;
- struct device_node *dev_node = dev_get_dev_node(dev);
+ struct arm_smmu_master_cfg *cfg;
+ struct device_node *np;
+ struct of_phandle_iterator it;
+ void *data = ⁢
+ __be32 pci_sid;
+ int err;
+ np = dev_get_dev_node(dev);
+ if (!np || !of_find_property(np, "#stream-id-cells", NULL)) {
+ of_node_put(np);
+ return -ENODEV;
+ }
+
+ it.node = np;
spin_lock(&arm_smmu_devices_lock);
list_for_each_entry(smmu, &arm_smmu_devices, list) {
- master = find_smmu_master(smmu, dev_node);
- if (master)
+ err = __find_legacy_master_phandle(smmu->dev, &data);
+ if (err)
break;
}
spin_unlock(&arm_smmu_devices_lock);
+ of_node_put(np);
+ if (err == 0)
+ return -ENODEV;
+ if (err < 0)
+ return err;
- return master ? smmu : NULL;
+ if (it.cur_count > MAX_MASTER_STREAMIDS) {
+ dev_err(smmu->dev,
+ "reached maximum number (%d) of stream IDs for master device %s\n",
+ MAX_MASTER_STREAMIDS, dev_name(dev));
+ return -ENOSPC;
+ }
+ if (dev_is_pci(dev)) {
+ /* "mmu-masters" assumes Stream ID == Requester ID */
+ pci_for_each_dma_alias(to_pci_dev(dev), __arm_smmu_get_pci_sid,
+ &pci_sid);
+ it.cur = &pci_sid;
+ it.cur_count = 1;
+ }
+
+ cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
+ if (!cfg)
+ return -ENOMEM;
+
+ cfg->smmu = smmu;
+ dev->archdata.iommu = cfg;
+
+ while (it.cur_count--)
+ cfg->streamids[cfg->num_streamids++] = be32_to_cpup(it.cur++);
+
+ return 0;
}
static int __arm_smmu_alloc_bitmap(unsigned long *map, int start, int end)
@@ -1119,8 +1064,7 @@ static void arm_smmu_free_smr(struct arm_smmu_device *smmu, int idx)
static void arm_smmu_write_smr(struct arm_smmu_device *smmu, int idx)
{
struct arm_smmu_smr *smr = smmu->smrs + idx;
- u32 reg = (smr->id & smmu->streamid_mask) << SMR_ID_SHIFT |
- (smr->mask & smmu->smr_mask_mask) << SMR_MASK_SHIFT;
+ u32 reg = smr->id << SMR_ID_SHIFT | smr->mask << SMR_MASK_SHIFT;
if (smr->valid)
reg |= SMR_VALID;
@@ -1189,9 +1133,9 @@ err_free_smrs:
return -ENOSPC;
}
-static void arm_smmu_master_free_smes(struct arm_smmu_device *smmu,
- struct arm_smmu_master_cfg *cfg)
+static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
{
+ struct arm_smmu_device *smmu = cfg->smmu;
int i;
/*
@@ -1262,17 +1206,15 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
{
int ret;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
- struct arm_smmu_device *smmu;
- struct arm_smmu_master_cfg *cfg;
+ struct arm_smmu_master_cfg *cfg = dev->archdata.iommu;
- smmu = find_smmu_for_device(dev);
- if (!smmu) {
+ if (!cfg) {
dev_err(dev, "cannot attach to SMMU, is it on the same bus?\n");
return -ENXIO;
}
/* Ensure that the domain is finalised */
- ret = arm_smmu_init_domain_context(domain, smmu);
+ ret = arm_smmu_init_domain_context(domain, cfg->smmu);
if (ret < 0)
return ret;
@@ -1280,18 +1222,14 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
* Sanity check the domain. We don't support domains across
* different SMMUs.
*/
- if (smmu_domain->smmu != smmu) {
+ if (smmu_domain->smmu != cfg->smmu) {
dev_err(dev,
"cannot attach to SMMU %s whilst already attached to domain on SMMU %s\n",
- dev_name(smmu_domain->smmu->dev), dev_name(smmu->dev));
+ dev_name(smmu_domain->smmu->dev), dev_name(cfg->smmu->dev));
return -EINVAL;
}
/* Looks ok, so add the device to the domain */
- cfg = find_smmu_master_cfg(dev);
- if (!cfg)
- return -ENODEV;
-
return arm_smmu_domain_add_master(smmu_domain, cfg);
}
@@ -1411,120 +1349,65 @@ static bool arm_smmu_capable(enum iommu_cap cap)
}
}
-static int __arm_smmu_get_pci_sid(struct pci_dev *pdev, u16 alias, void *data)
-{
- *((u16 *)data) = alias;
- return 0; /* Continue walking */
-}
-
-static void __arm_smmu_release_pci_iommudata(void *data)
-{
- kfree(data);
-}
-
-static int arm_smmu_init_pci_device(struct pci_dev *pdev,
- struct iommu_group *group)
-{
- struct arm_smmu_master_cfg *cfg;
- u16 sid;
- int i;
-
- cfg = iommu_group_get_iommudata(group);
- if (!cfg) {
- cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
- if (!cfg)
- return -ENOMEM;
-
- iommu_group_set_iommudata(group, cfg,
- __arm_smmu_release_pci_iommudata);
- }
-
- if (cfg->num_streamids >= MAX_MASTER_STREAMIDS)
- return -ENOSPC;
-
- /*
- * Assume Stream ID == Requester ID for now.
- * We need a way to describe the ID mappings in FDT.
- */
- pci_for_each_dma_alias(pdev, __arm_smmu_get_pci_sid, &sid);
- for (i = 0; i < cfg->num_streamids; ++i)
- if (cfg->streamids[i] == sid)
- break;
-
- /* Avoid duplicate SIDs, as this can lead to SMR conflicts */
- if (i == cfg->num_streamids) {
- cfg->streamids[i] = sid;
- cfg->smendx[i] = INVALID_SMENDX;
- cfg->num_streamids++;
- }
-
- return 0;
-}
-
-static int arm_smmu_init_platform_device(struct device *dev,
- struct iommu_group *group)
-{
- struct arm_smmu_device *smmu = find_smmu_for_device(dev);
- struct arm_smmu_master *master;
-
- if (!smmu)
- return -ENODEV;
-
- master = find_smmu_master(smmu, dev->of_node);
- if (!master)
- return -ENODEV;
-
- iommu_group_set_iommudata(group, &master->cfg, NULL);
-
- return 0;
-}
-
static int arm_smmu_add_device(struct device *dev)
{
+ struct arm_smmu_master_cfg *cfg;
struct iommu_group *group;
+ int i, ret;
+
+ ret = arm_smmu_register_legacy_master(dev);
+ cfg = dev->archdata.iommu;
+ if (ret)
+ goto out_free;
+
+ ret = -EINVAL;
+ for (i = 0; i < cfg->num_streamids; i++) {
+ u16 sid = cfg->streamids[i];
+
+ if (sid & ~cfg->smmu->streamid_mask) {
+ dev_err(dev, "stream ID 0x%x out of range for SMMU (0x%x)\n",
+ sid, cfg->smmu->streamid_mask);
+ goto out_free;
+ }
+ cfg->smendx[i] = INVALID_SMENDX;
+ }
group = iommu_group_get_for_dev(dev);
- if (IS_ERR(group))
- return PTR_ERR(group);
-
+ if (IS_ERR(group)) {
+ ret = PTR_ERR(group);
+ goto out_free;
+ }
iommu_group_put(group);
return 0;
+
+out_free:
+ kfree(cfg);
+ dev->archdata.iommu = NULL;
+ return ret;
}
static void arm_smmu_remove_device(struct device *dev)
{
- struct arm_smmu_device *smmu = find_smmu_for_device(dev);
- struct arm_smmu_master_cfg *cfg = find_smmu_master_cfg(dev);
+ struct arm_smmu_master_cfg *cfg = dev->archdata.iommu;
- if (smmu && cfg)
- arm_smmu_master_free_smes(smmu, cfg);
+ if (!cfg)
+ return;
+ arm_smmu_master_free_smes(cfg);
iommu_group_remove_device(dev);
+ kfree(cfg);
+ dev->archdata.iommu = NULL;
}
static struct iommu_group *arm_smmu_device_group(struct device *dev)
{
struct iommu_group *group;
- int ret;
if (dev_is_pci(dev))
group = pci_device_group(dev);
else
group = generic_device_group(dev);
- if (IS_ERR(group))
- return group;
-
- if (dev_is_pci(dev))
- ret = arm_smmu_init_pci_device(to_pci_dev(dev), group);
- else
- ret = arm_smmu_init_platform_device(dev, group);
-
- if (ret) {
- iommu_group_put(group);
- group = ERR_PTR(ret);
- }
-
return group;
}
@@ -1938,9 +1821,6 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
struct resource *res;
struct arm_smmu_device *smmu;
struct device *dev = &pdev->dev;
- struct rb_node *node;
- struct of_phandle_iterator it;
- struct arm_smmu_phandle_args *masterspec;
int num_irqs, i, err;
smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL);
@@ -2001,37 +1881,6 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
if (err)
return err;
- i = 0;
- smmu->masters = RB_ROOT;
-
- err = -ENOMEM;
- /* No need to zero the memory for masterspec */
- masterspec = kmalloc(sizeof(*masterspec), GFP_KERNEL);
- if (!masterspec)
- goto out_put_masters;
-
- of_for_each_phandle(&it, err, dev->of_node,
- "mmu-masters", "#stream-id-cells", 0) {
- int count = of_phandle_iterator_args(&it, masterspec->args,
- MAX_MASTER_STREAMIDS);
- masterspec->np = of_node_get(it.node);
- masterspec->args_count = count;
-
- err = register_smmu_master(smmu, dev, masterspec);
- if (err) {
- dev_err(dev, "failed to add master %s\n",
- masterspec->np->name);
- kfree(masterspec);
- goto out_put_masters;
- }
-
- i++;
- }
-
- dev_notice(dev, "registered %d master devices\n", i);
-
- kfree(masterspec);
-
parse_driver_options(smmu);
if (smmu->version == ARM_SMMU_V2 &&
@@ -2039,8 +1888,7 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
dev_err(dev,
"found only %d context interrupt(s) but %d required\n",
smmu->num_context_irqs, smmu->num_context_banks);
- err = -ENODEV;
- goto out_put_masters;
+ return -ENODEV;
}
for (i = 0; i < smmu->num_global_irqs; ++i) {
@@ -2052,7 +1900,7 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
if (err) {
dev_err(dev, "failed to request global IRQ %d (%u)\n",
i, smmu->irqs[i]);
- goto out_put_masters;
+ return err;
}
}
@@ -2063,22 +1911,12 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
arm_smmu_device_reset(smmu);
return 0;
-
-out_put_masters:
- for (node = rb_first(&smmu->masters); node; node = rb_next(node)) {
- struct arm_smmu_master *master
- = container_of(node, struct arm_smmu_master, node);
- of_node_put(master->of_node);
- }
-
- return err;
}
static int arm_smmu_device_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct arm_smmu_device *curr, *smmu = NULL;
- struct rb_node *node;
spin_lock(&arm_smmu_devices_lock);
list_for_each_entry(curr, &arm_smmu_devices, list) {
@@ -2093,12 +1931,6 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
if (!smmu)
return -ENODEV;
- for (node = rb_first(&smmu->masters); node; node = rb_next(node)) {
- struct arm_smmu_master *master
- = container_of(node, struct arm_smmu_master, node);
- of_node_put(master->of_node);
- }
-
if (!bitmap_empty(smmu->context_map, ARM_SMMU_MAX_CBS))
dev_err(dev, "removing device with active domains!\n");
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 12/20] iommu/arm-smmu: Streamline SMMU data lookups
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
Simplify things somewhat by stashing our arm_smmu_device instance in
drvdata, so that it's readily available to our driver model callbacks.
Then we can excise the private list entirely, since the driver core
already has a perfectly good list of SMMU devices we can use in the one
instance we actually need to. Finally, make a further modest code saving
with the relatively new of_device_get_match_data() helper.
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
drivers/iommu/arm-smmu.c | 44 +++++++++++---------------------------------
1 file changed, 11 insertions(+), 33 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 0a628f2c9297..3962add0c33b 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -41,6 +41,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/of_device.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@@ -370,8 +371,6 @@ struct arm_smmu_device {
u32 num_context_irqs;
unsigned int *irqs;
- struct list_head list;
-
u32 cavium_id_base; /* Specific to Cavium */
};
@@ -409,9 +408,6 @@ struct arm_smmu_domain {
struct iommu_domain domain;
};
-static DEFINE_SPINLOCK(arm_smmu_devices_lock);
-static LIST_HEAD(arm_smmu_devices);
-
struct arm_smmu_option_prop {
u32 opt;
const char *prop;
@@ -478,6 +474,8 @@ static int __find_legacy_master_phandle(struct device *dev, void *data)
return err;
}
+static struct platform_driver arm_smmu_driver;
+
static int arm_smmu_register_legacy_master(struct device *dev)
{
struct arm_smmu_device *smmu;
@@ -495,19 +493,16 @@ static int arm_smmu_register_legacy_master(struct device *dev)
}
it.node = np;
- spin_lock(&arm_smmu_devices_lock);
- list_for_each_entry(smmu, &arm_smmu_devices, list) {
- err = __find_legacy_master_phandle(smmu->dev, &data);
- if (err)
- break;
- }
- spin_unlock(&arm_smmu_devices_lock);
+ err = driver_for_each_device(&arm_smmu_driver.driver, NULL, &data,
+ __find_legacy_master_phandle);
of_node_put(np);
if (err == 0)
return -ENODEV;
if (err < 0)
return err;
+ smmu = dev_get_drvdata(data);
+
if (it.cur_count > MAX_MASTER_STREAMIDS) {
dev_err(smmu->dev,
"reached maximum number (%d) of stream IDs for master device %s\n",
@@ -1816,7 +1811,6 @@ MODULE_DEVICE_TABLE(of, arm_smmu_of_match);
static int arm_smmu_device_dt_probe(struct platform_device *pdev)
{
- const struct of_device_id *of_id;
const struct arm_smmu_match_data *data;
struct resource *res;
struct arm_smmu_device *smmu;
@@ -1830,8 +1824,7 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
}
smmu->dev = dev;
- of_id = of_match_node(arm_smmu_of_match, dev->of_node);
- data = of_id->data;
+ data = of_device_get_match_data(dev);
smmu->version = data->version;
smmu->model = data->model;
@@ -1904,35 +1897,20 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
}
}
- INIT_LIST_HEAD(&smmu->list);
- spin_lock(&arm_smmu_devices_lock);
- list_add(&smmu->list, &arm_smmu_devices);
- spin_unlock(&arm_smmu_devices_lock);
-
+ platform_set_drvdata(pdev, smmu);
arm_smmu_device_reset(smmu);
return 0;
}
static int arm_smmu_device_remove(struct platform_device *pdev)
{
- struct device *dev = &pdev->dev;
- struct arm_smmu_device *curr, *smmu = NULL;
-
- spin_lock(&arm_smmu_devices_lock);
- list_for_each_entry(curr, &arm_smmu_devices, list) {
- if (curr->dev == dev) {
- smmu = curr;
- list_del(&smmu->list);
- break;
- }
- }
- spin_unlock(&arm_smmu_devices_lock);
+ struct arm_smmu_device *smmu = platform_get_drvdata(pdev);
if (!smmu)
return -ENODEV;
if (!bitmap_empty(smmu->context_map, ARM_SMMU_MAX_CBS))
- dev_err(dev, "removing device with active domains!\n");
+ dev_err(&pdev->dev, "removing device with active domains!\n");
/* Turn the thing off */
writel(sCR0_CLIENTPD, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);
--
2.8.1.dirty
--
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^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 12/20] iommu/arm-smmu: Streamline SMMU data lookups
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
Simplify things somewhat by stashing our arm_smmu_device instance in
drvdata, so that it's readily available to our driver model callbacks.
Then we can excise the private list entirely, since the driver core
already has a perfectly good list of SMMU devices we can use in the one
instance we actually need to. Finally, make a further modest code saving
with the relatively new of_device_get_match_data() helper.
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/iommu/arm-smmu.c | 44 +++++++++++---------------------------------
1 file changed, 11 insertions(+), 33 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 0a628f2c9297..3962add0c33b 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -41,6 +41,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/of_device.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@@ -370,8 +371,6 @@ struct arm_smmu_device {
u32 num_context_irqs;
unsigned int *irqs;
- struct list_head list;
-
u32 cavium_id_base; /* Specific to Cavium */
};
@@ -409,9 +408,6 @@ struct arm_smmu_domain {
struct iommu_domain domain;
};
-static DEFINE_SPINLOCK(arm_smmu_devices_lock);
-static LIST_HEAD(arm_smmu_devices);
-
struct arm_smmu_option_prop {
u32 opt;
const char *prop;
@@ -478,6 +474,8 @@ static int __find_legacy_master_phandle(struct device *dev, void *data)
return err;
}
+static struct platform_driver arm_smmu_driver;
+
static int arm_smmu_register_legacy_master(struct device *dev)
{
struct arm_smmu_device *smmu;
@@ -495,19 +493,16 @@ static int arm_smmu_register_legacy_master(struct device *dev)
}
it.node = np;
- spin_lock(&arm_smmu_devices_lock);
- list_for_each_entry(smmu, &arm_smmu_devices, list) {
- err = __find_legacy_master_phandle(smmu->dev, &data);
- if (err)
- break;
- }
- spin_unlock(&arm_smmu_devices_lock);
+ err = driver_for_each_device(&arm_smmu_driver.driver, NULL, &data,
+ __find_legacy_master_phandle);
of_node_put(np);
if (err == 0)
return -ENODEV;
if (err < 0)
return err;
+ smmu = dev_get_drvdata(data);
+
if (it.cur_count > MAX_MASTER_STREAMIDS) {
dev_err(smmu->dev,
"reached maximum number (%d) of stream IDs for master device %s\n",
@@ -1816,7 +1811,6 @@ MODULE_DEVICE_TABLE(of, arm_smmu_of_match);
static int arm_smmu_device_dt_probe(struct platform_device *pdev)
{
- const struct of_device_id *of_id;
const struct arm_smmu_match_data *data;
struct resource *res;
struct arm_smmu_device *smmu;
@@ -1830,8 +1824,7 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
}
smmu->dev = dev;
- of_id = of_match_node(arm_smmu_of_match, dev->of_node);
- data = of_id->data;
+ data = of_device_get_match_data(dev);
smmu->version = data->version;
smmu->model = data->model;
@@ -1904,35 +1897,20 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
}
}
- INIT_LIST_HEAD(&smmu->list);
- spin_lock(&arm_smmu_devices_lock);
- list_add(&smmu->list, &arm_smmu_devices);
- spin_unlock(&arm_smmu_devices_lock);
-
+ platform_set_drvdata(pdev, smmu);
arm_smmu_device_reset(smmu);
return 0;
}
static int arm_smmu_device_remove(struct platform_device *pdev)
{
- struct device *dev = &pdev->dev;
- struct arm_smmu_device *curr, *smmu = NULL;
-
- spin_lock(&arm_smmu_devices_lock);
- list_for_each_entry(curr, &arm_smmu_devices, list) {
- if (curr->dev == dev) {
- smmu = curr;
- list_del(&smmu->list);
- break;
- }
- }
- spin_unlock(&arm_smmu_devices_lock);
+ struct arm_smmu_device *smmu = platform_get_drvdata(pdev);
if (!smmu)
return -ENODEV;
if (!bitmap_empty(smmu->context_map, ARM_SMMU_MAX_CBS))
- dev_err(dev, "removing device with active domains!\n");
+ dev_err(&pdev->dev, "removing device with active domains!\n");
/* Turn the thing off */
writel(sCR0_CLIENTPD, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 13/20] iommu/arm-smmu: Add a stream map entry iterator
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
We iterate over the SMEs associated with a master config quite a lot in
various places, and are about to do so even more. Let's wrap the idiom
in a handy iterator macro before the repetition gets out of hand.
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
drivers/iommu/arm-smmu.c | 26 ++++++++++++--------------
1 file changed, 12 insertions(+), 14 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 3962add0c33b..7a0edef34a22 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -324,6 +324,8 @@ struct arm_smmu_master_cfg {
s16 smendx[MAX_MASTER_STREAMIDS];
};
#define INVALID_SMENDX -1
+#define for_each_cfg_sme(cfg, i, idx) \
+ for (i = 0; idx = cfg->smendx[i], i < cfg->num_streamids; ++i)
struct arm_smmu_device {
struct device *dev;
@@ -1090,8 +1092,8 @@ static int arm_smmu_master_alloc_smes(struct arm_smmu_device *smmu,
int i, idx;
/* Allocate the SMRs on the SMMU */
- for (i = 0; i < cfg->num_streamids; ++i) {
- if (cfg->smendx[i] != INVALID_SMENDX)
+ for_each_cfg_sme(cfg, i, idx) {
+ if (idx != INVALID_SMENDX)
return -EEXIST;
/* ...except on stream indexing hardware, of course */
@@ -1115,8 +1117,8 @@ static int arm_smmu_master_alloc_smes(struct arm_smmu_device *smmu,
return 0;
/* It worked! Now, poke the actual hardware */
- for (i = 0; i < cfg->num_streamids; ++i)
- arm_smmu_write_smr(smmu, cfg->smendx[i]);
+ for_each_cfg_sme(cfg, i, idx)
+ arm_smmu_write_smr(smmu, idx);
return 0;
@@ -1131,15 +1133,13 @@ err_free_smrs:
static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
{
struct arm_smmu_device *smmu = cfg->smmu;
- int i;
+ int i, idx;
/*
* We *must* clear the S2CR first, because freeing the SMR means
* that it can be re-allocated immediately.
*/
- for (i = 0; i < cfg->num_streamids; ++i) {
- int idx = cfg->smendx[i];
-
+ for_each_cfg_sme(cfg, i, idx) {
/* An IOMMU group is torn down by the first device to be removed */
if (idx == INVALID_SMENDX)
return;
@@ -1151,9 +1151,9 @@ static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
__iowmb();
/* Invalidate the SMRs before freeing back to the allocator */
- for (i = 0; i < cfg->num_streamids; ++i) {
+ for_each_cfg_sme(cfg, i, idx) {
if (smmu->smrs)
- arm_smmu_free_smr(smmu, cfg->smendx[i]);
+ arm_smmu_free_smr(smmu, idx);
cfg->smendx[i] = INVALID_SMENDX;
}
@@ -1162,7 +1162,7 @@ static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
struct arm_smmu_master_cfg *cfg)
{
- int i, ret = 0;
+ int i, idx, ret = 0;
struct arm_smmu_device *smmu = smmu_domain->smmu;
struct arm_smmu_s2cr *s2cr = smmu->s2crs;
enum arm_smmu_s2cr_type type = S2CR_TYPE_TRANS;
@@ -1182,9 +1182,7 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
if (smmu_domain->domain.type == IOMMU_DOMAIN_DMA)
type = S2CR_TYPE_BYPASS;
- for (i = 0; i < cfg->num_streamids; ++i) {
- int idx = cfg->smendx[i];
-
+ for_each_cfg_sme(cfg, i, idx) {
/* Devices in an IOMMU group may already be configured */
if (type == s2cr[idx].type && cbndx == s2cr[idx].cbndx)
break;
--
2.8.1.dirty
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
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^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 13/20] iommu/arm-smmu: Add a stream map entry iterator
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
We iterate over the SMEs associated with a master config quite a lot in
various places, and are about to do so even more. Let's wrap the idiom
in a handy iterator macro before the repetition gets out of hand.
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/iommu/arm-smmu.c | 26 ++++++++++++--------------
1 file changed, 12 insertions(+), 14 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 3962add0c33b..7a0edef34a22 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -324,6 +324,8 @@ struct arm_smmu_master_cfg {
s16 smendx[MAX_MASTER_STREAMIDS];
};
#define INVALID_SMENDX -1
+#define for_each_cfg_sme(cfg, i, idx) \
+ for (i = 0; idx = cfg->smendx[i], i < cfg->num_streamids; ++i)
struct arm_smmu_device {
struct device *dev;
@@ -1090,8 +1092,8 @@ static int arm_smmu_master_alloc_smes(struct arm_smmu_device *smmu,
int i, idx;
/* Allocate the SMRs on the SMMU */
- for (i = 0; i < cfg->num_streamids; ++i) {
- if (cfg->smendx[i] != INVALID_SMENDX)
+ for_each_cfg_sme(cfg, i, idx) {
+ if (idx != INVALID_SMENDX)
return -EEXIST;
/* ...except on stream indexing hardware, of course */
@@ -1115,8 +1117,8 @@ static int arm_smmu_master_alloc_smes(struct arm_smmu_device *smmu,
return 0;
/* It worked! Now, poke the actual hardware */
- for (i = 0; i < cfg->num_streamids; ++i)
- arm_smmu_write_smr(smmu, cfg->smendx[i]);
+ for_each_cfg_sme(cfg, i, idx)
+ arm_smmu_write_smr(smmu, idx);
return 0;
@@ -1131,15 +1133,13 @@ err_free_smrs:
static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
{
struct arm_smmu_device *smmu = cfg->smmu;
- int i;
+ int i, idx;
/*
* We *must* clear the S2CR first, because freeing the SMR means
* that it can be re-allocated immediately.
*/
- for (i = 0; i < cfg->num_streamids; ++i) {
- int idx = cfg->smendx[i];
-
+ for_each_cfg_sme(cfg, i, idx) {
/* An IOMMU group is torn down by the first device to be removed */
if (idx == INVALID_SMENDX)
return;
@@ -1151,9 +1151,9 @@ static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
__iowmb();
/* Invalidate the SMRs before freeing back to the allocator */
- for (i = 0; i < cfg->num_streamids; ++i) {
+ for_each_cfg_sme(cfg, i, idx) {
if (smmu->smrs)
- arm_smmu_free_smr(smmu, cfg->smendx[i]);
+ arm_smmu_free_smr(smmu, idx);
cfg->smendx[i] = INVALID_SMENDX;
}
@@ -1162,7 +1162,7 @@ static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
struct arm_smmu_master_cfg *cfg)
{
- int i, ret = 0;
+ int i, idx, ret = 0;
struct arm_smmu_device *smmu = smmu_domain->smmu;
struct arm_smmu_s2cr *s2cr = smmu->s2crs;
enum arm_smmu_s2cr_type type = S2CR_TYPE_TRANS;
@@ -1182,9 +1182,7 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
if (smmu_domain->domain.type == IOMMU_DOMAIN_DMA)
type = S2CR_TYPE_BYPASS;
- for (i = 0; i < cfg->num_streamids; ++i) {
- int idx = cfg->smendx[i];
-
+ for_each_cfg_sme(cfg, i, idx) {
/* Devices in an IOMMU group may already be configured */
if (type == s2cr[idx].type && cbndx == s2cr[idx].cbndx)
break;
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 14/20] iommu/arm-smmu: Intelligent SMR allocation
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
Stream Match Registers are one of the more awkward parts of the SMMUv2
architecture; there are typically never enough to assign one to each
stream ID in the system, and configuring them such that a single ID
matches multiple entries is catastrophically bad - at best, every
transaction raises a global fault; at worst, they go *somewhere*.
To address the former issue, we can mask ID bits such that a single
register may be used to match multiple IDs belonging to the same device
or group, but doing so also heightens the risk of the latter problem
(which can be nasty to debug).
Tackle both problems at once by replacing the simple bitmap allocator
with something much cleverer. Now that we have convenient in-memory
representations of the stream mapping table, it becomes straightforward
to properly validate new SMR entries against the current state, opening
the door to arbitrary masking and SMR sharing.
Another feature which falls out of this is that with IDs shared by
separate devices being automatically accounted for, simply associating a
group pointer with the S2CR offers appropriate group allocation almost
for free, so hook that up in the process.
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
- Simplify SMR matching logic, and document it properly
- Explicify INVALID_SMENDX check
---
drivers/iommu/arm-smmu.c | 201 ++++++++++++++++++++++++++++-------------------
1 file changed, 121 insertions(+), 80 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 7a0edef34a22..0e7dbf59335d 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -302,6 +302,8 @@ enum arm_smmu_implementation {
};
struct arm_smmu_s2cr {
+ struct iommu_group *group;
+ int count;
enum arm_smmu_s2cr_type type;
enum arm_smmu_s2cr_privcfg privcfg;
u8 cbndx;
@@ -363,6 +365,7 @@ struct arm_smmu_device {
u16 smr_mask_mask;
struct arm_smmu_smr *smrs;
struct arm_smmu_s2cr *s2crs;
+ struct mutex stream_map_mutex;
unsigned long va_size;
unsigned long ipa_size;
@@ -1041,23 +1044,6 @@ static void arm_smmu_domain_free(struct iommu_domain *domain)
kfree(smmu_domain);
}
-static int arm_smmu_alloc_smr(struct arm_smmu_device *smmu)
-{
- int i;
-
- for (i = 0; i < smmu->num_mapping_groups; i++)
- if (!cmpxchg(&smmu->smrs[i].valid, false, true))
- return i;
-
- return INVALID_SMENDX;
-}
-
-static void arm_smmu_free_smr(struct arm_smmu_device *smmu, int idx)
-{
- writel_relaxed(~SMR_VALID, ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_SMR(idx));
- WRITE_ONCE(smmu->smrs[idx].valid, false);
-}
-
static void arm_smmu_write_smr(struct arm_smmu_device *smmu, int idx)
{
struct arm_smmu_smr *smr = smmu->smrs + idx;
@@ -1085,49 +1071,115 @@ static void arm_smmu_write_sme(struct arm_smmu_device *smmu, int idx)
arm_smmu_write_smr(smmu, idx);
}
-static int arm_smmu_master_alloc_smes(struct arm_smmu_device *smmu,
- struct arm_smmu_master_cfg *cfg)
+static int arm_smmu_find_sme(struct arm_smmu_device *smmu, u16 id, u16 mask)
{
struct arm_smmu_smr *smrs = smmu->smrs;
- int i, idx;
+ int i, free_idx = -ENOSPC;
- /* Allocate the SMRs on the SMMU */
- for_each_cfg_sme(cfg, i, idx) {
- if (idx != INVALID_SMENDX)
- return -EEXIST;
+ /* Stream indexing is blissfully easy */
+ if (!smrs)
+ return id;
- /* ...except on stream indexing hardware, of course */
- if (!smrs) {
- cfg->smendx[i] = cfg->streamids[i];
+ /* Validating SMRs is... less so */
+ for (i = 0; i < smmu->num_mapping_groups; ++i) {
+ if (!smrs[i].valid) {
+ /*
+ * Note the first free entry we come across, which
+ * we'll claim in the end if nothing else matches.
+ */
+ if (free_idx < 0)
+ free_idx = i;
continue;
}
-
- idx = arm_smmu_alloc_smr(smmu);
- if (idx < 0) {
- dev_err(smmu->dev, "failed to allocate free SMR\n");
- goto err_free_smrs;
- }
- cfg->smendx[i] = idx;
-
- smrs[idx].id = cfg->streamids[i];
- smrs[idx].mask = 0; /* We don't currently share SMRs */
+ /*
+ * If the new entry is _entirely_ matched by an existing entry,
+ * then reuse that, with the guarantee that there also cannot
+ * be any subsequent conflicting entries. In normal use we'd
+ * expect simply identical entries for this case, but there's
+ * no harm in accommodating the generalisation.
+ */
+ if ((mask & smrs[i].mask) == mask &&
+ !((id ^ smrs[i].id) & ~smrs[i].mask))
+ return i;
+ /*
+ * If the new entry has any other overlap with an existing one,
+ * though, then there always exists at least one stream ID
+ * which would cause a conflict, and we can't allow that risk.
+ */
+ if (!((id ^ smrs[i].id) & ~(smrs[i].mask | mask)))
+ return -EINVAL;
}
- if (!smrs)
- return 0;
+ return free_idx;
+}
+
+static bool arm_smmu_free_sme(struct arm_smmu_device *smmu, int idx)
+{
+ if (--smmu->s2crs[idx].count)
+ return false;
+
+ smmu->s2crs[idx] = s2cr_init_val;
+ if (smmu->smrs)
+ smmu->smrs[idx].valid = false;
+
+ return true;
+}
+
+static int arm_smmu_master_alloc_smes(struct device *dev)
+{
+ struct arm_smmu_master_cfg *cfg = dev->archdata.iommu;
+ struct arm_smmu_device *smmu = cfg->smmu;
+ struct arm_smmu_smr *smrs = smmu->smrs;
+ struct iommu_group *group;
+ int i, idx, ret;
+
+ mutex_lock(&smmu->stream_map_mutex);
+ /* Figure out a viable stream map entry allocation */
+ for_each_cfg_sme(cfg, i, idx) {
+ if (idx != INVALID_SMENDX) {
+ ret = -EEXIST;
+ goto out_err;
+ }
+
+ ret = arm_smmu_find_sme(smmu, cfg->streamids[i], 0);
+ if (ret < 0)
+ goto out_err;
+
+ idx = ret;
+ if (smrs && smmu->s2crs[idx].count == 0) {
+ smrs[idx].id = cfg->streamids[i];
+ smrs[idx].mask = 0; /* We don't currently share SMRs */
+ smrs[idx].valid = true;
+ }
+ smmu->s2crs[idx].count++;
+ cfg->smendx[i] = (s16)idx;
+ }
+
+ group = iommu_group_get_for_dev(dev);
+ if (!group)
+ group = ERR_PTR(-ENOMEM);
+ if (IS_ERR(group)) {
+ ret = PTR_ERR(group);
+ goto out_err;
+ }
+ iommu_group_put(group);
/* It worked! Now, poke the actual hardware */
- for_each_cfg_sme(cfg, i, idx)
- arm_smmu_write_smr(smmu, idx);
+ for_each_cfg_sme(cfg, i, idx) {
+ arm_smmu_write_sme(smmu, idx);
+ smmu->s2crs[idx].group = group;
+ }
+ mutex_unlock(&smmu->stream_map_mutex);
return 0;
-err_free_smrs:
+out_err:
while (i--) {
- arm_smmu_free_smr(smmu, cfg->smendx[i]);
+ arm_smmu_free_sme(smmu, cfg->smendx[i]);
cfg->smendx[i] = INVALID_SMENDX;
}
- return -ENOSPC;
+ mutex_unlock(&smmu->stream_map_mutex);
+ return ret;
}
static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
@@ -1135,43 +1187,23 @@ static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
struct arm_smmu_device *smmu = cfg->smmu;
int i, idx;
- /*
- * We *must* clear the S2CR first, because freeing the SMR means
- * that it can be re-allocated immediately.
- */
+ mutex_lock(&smmu->stream_map_mutex);
for_each_cfg_sme(cfg, i, idx) {
- /* An IOMMU group is torn down by the first device to be removed */
- if (idx == INVALID_SMENDX)
- return;
-
- smmu->s2crs[idx] = s2cr_init_val;
- arm_smmu_write_s2cr(smmu, idx);
- }
- /* Sync S2CR updates before touching anything else */
- __iowmb();
-
- /* Invalidate the SMRs before freeing back to the allocator */
- for_each_cfg_sme(cfg, i, idx) {
- if (smmu->smrs)
- arm_smmu_free_smr(smmu, idx);
-
+ if (arm_smmu_free_sme(smmu, idx))
+ arm_smmu_write_sme(smmu, idx);
cfg->smendx[i] = INVALID_SMENDX;
}
+ mutex_unlock(&smmu->stream_map_mutex);
}
static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
struct arm_smmu_master_cfg *cfg)
{
- int i, idx, ret = 0;
struct arm_smmu_device *smmu = smmu_domain->smmu;
struct arm_smmu_s2cr *s2cr = smmu->s2crs;
enum arm_smmu_s2cr_type type = S2CR_TYPE_TRANS;
u8 cbndx = smmu_domain->cfg.cbndx;
-
- if (cfg->smendx[0] == INVALID_SMENDX)
- ret = arm_smmu_master_alloc_smes(smmu, cfg);
- if (ret)
- return ret;
+ int i, idx;
/*
* FIXME: This won't be needed once we have IOMMU-backed DMA ops
@@ -1183,9 +1215,8 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
type = S2CR_TYPE_BYPASS;
for_each_cfg_sme(cfg, i, idx) {
- /* Devices in an IOMMU group may already be configured */
if (type == s2cr[idx].type && cbndx == s2cr[idx].cbndx)
- break;
+ continue;
s2cr[idx].type = type;
s2cr[idx].privcfg = S2CR_PRIVCFG_UNPRIV;
@@ -1345,7 +1376,6 @@ static bool arm_smmu_capable(enum iommu_cap cap)
static int arm_smmu_add_device(struct device *dev)
{
struct arm_smmu_master_cfg *cfg;
- struct iommu_group *group;
int i, ret;
ret = arm_smmu_register_legacy_master(dev);
@@ -1365,13 +1395,9 @@ static int arm_smmu_add_device(struct device *dev)
cfg->smendx[i] = INVALID_SMENDX;
}
- group = iommu_group_get_for_dev(dev);
- if (IS_ERR(group)) {
- ret = PTR_ERR(group);
- goto out_free;
- }
- iommu_group_put(group);
- return 0;
+ ret = arm_smmu_master_alloc_smes(dev);
+ if (!ret)
+ return ret;
out_free:
kfree(cfg);
@@ -1394,7 +1420,21 @@ static void arm_smmu_remove_device(struct device *dev)
static struct iommu_group *arm_smmu_device_group(struct device *dev)
{
- struct iommu_group *group;
+ struct arm_smmu_master_cfg *cfg = dev->archdata.iommu;
+ struct arm_smmu_device *smmu = cfg->smmu;
+ struct iommu_group *group = NULL;
+ int i, idx;
+
+ for_each_cfg_sme(cfg, i, idx) {
+ if (group && smmu->s2crs[idx].group &&
+ group != smmu->s2crs[idx].group)
+ return ERR_PTR(-EINVAL);
+
+ group = smmu->s2crs[idx].group;
+ }
+
+ if (group)
+ return group;
if (dev_is_pci(dev))
group = pci_device_group(dev);
@@ -1677,6 +1717,7 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
smmu->s2crs[i] = s2cr_init_val;
smmu->num_mapping_groups = size;
+ mutex_init(&smmu->stream_map_mutex);
if (smmu->version < ARM_SMMU_V2 || !(id & ID0_PTFS_NO_AARCH32)) {
smmu->features |= ARM_SMMU_FEAT_FMT_AARCH32_L;
--
2.8.1.dirty
--
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^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 14/20] iommu/arm-smmu: Intelligent SMR allocation
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
Stream Match Registers are one of the more awkward parts of the SMMUv2
architecture; there are typically never enough to assign one to each
stream ID in the system, and configuring them such that a single ID
matches multiple entries is catastrophically bad - at best, every
transaction raises a global fault; at worst, they go *somewhere*.
To address the former issue, we can mask ID bits such that a single
register may be used to match multiple IDs belonging to the same device
or group, but doing so also heightens the risk of the latter problem
(which can be nasty to debug).
Tackle both problems at once by replacing the simple bitmap allocator
with something much cleverer. Now that we have convenient in-memory
representations of the stream mapping table, it becomes straightforward
to properly validate new SMR entries against the current state, opening
the door to arbitrary masking and SMR sharing.
Another feature which falls out of this is that with IDs shared by
separate devices being automatically accounted for, simply associating a
group pointer with the S2CR offers appropriate group allocation almost
for free, so hook that up in the process.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
- Simplify SMR matching logic, and document it properly
- Explicify INVALID_SMENDX check
---
drivers/iommu/arm-smmu.c | 201 ++++++++++++++++++++++++++++-------------------
1 file changed, 121 insertions(+), 80 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 7a0edef34a22..0e7dbf59335d 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -302,6 +302,8 @@ enum arm_smmu_implementation {
};
struct arm_smmu_s2cr {
+ struct iommu_group *group;
+ int count;
enum arm_smmu_s2cr_type type;
enum arm_smmu_s2cr_privcfg privcfg;
u8 cbndx;
@@ -363,6 +365,7 @@ struct arm_smmu_device {
u16 smr_mask_mask;
struct arm_smmu_smr *smrs;
struct arm_smmu_s2cr *s2crs;
+ struct mutex stream_map_mutex;
unsigned long va_size;
unsigned long ipa_size;
@@ -1041,23 +1044,6 @@ static void arm_smmu_domain_free(struct iommu_domain *domain)
kfree(smmu_domain);
}
-static int arm_smmu_alloc_smr(struct arm_smmu_device *smmu)
-{
- int i;
-
- for (i = 0; i < smmu->num_mapping_groups; i++)
- if (!cmpxchg(&smmu->smrs[i].valid, false, true))
- return i;
-
- return INVALID_SMENDX;
-}
-
-static void arm_smmu_free_smr(struct arm_smmu_device *smmu, int idx)
-{
- writel_relaxed(~SMR_VALID, ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_SMR(idx));
- WRITE_ONCE(smmu->smrs[idx].valid, false);
-}
-
static void arm_smmu_write_smr(struct arm_smmu_device *smmu, int idx)
{
struct arm_smmu_smr *smr = smmu->smrs + idx;
@@ -1085,49 +1071,115 @@ static void arm_smmu_write_sme(struct arm_smmu_device *smmu, int idx)
arm_smmu_write_smr(smmu, idx);
}
-static int arm_smmu_master_alloc_smes(struct arm_smmu_device *smmu,
- struct arm_smmu_master_cfg *cfg)
+static int arm_smmu_find_sme(struct arm_smmu_device *smmu, u16 id, u16 mask)
{
struct arm_smmu_smr *smrs = smmu->smrs;
- int i, idx;
+ int i, free_idx = -ENOSPC;
- /* Allocate the SMRs on the SMMU */
- for_each_cfg_sme(cfg, i, idx) {
- if (idx != INVALID_SMENDX)
- return -EEXIST;
+ /* Stream indexing is blissfully easy */
+ if (!smrs)
+ return id;
- /* ...except on stream indexing hardware, of course */
- if (!smrs) {
- cfg->smendx[i] = cfg->streamids[i];
+ /* Validating SMRs is... less so */
+ for (i = 0; i < smmu->num_mapping_groups; ++i) {
+ if (!smrs[i].valid) {
+ /*
+ * Note the first free entry we come across, which
+ * we'll claim in the end if nothing else matches.
+ */
+ if (free_idx < 0)
+ free_idx = i;
continue;
}
-
- idx = arm_smmu_alloc_smr(smmu);
- if (idx < 0) {
- dev_err(smmu->dev, "failed to allocate free SMR\n");
- goto err_free_smrs;
- }
- cfg->smendx[i] = idx;
-
- smrs[idx].id = cfg->streamids[i];
- smrs[idx].mask = 0; /* We don't currently share SMRs */
+ /*
+ * If the new entry is _entirely_ matched by an existing entry,
+ * then reuse that, with the guarantee that there also cannot
+ * be any subsequent conflicting entries. In normal use we'd
+ * expect simply identical entries for this case, but there's
+ * no harm in accommodating the generalisation.
+ */
+ if ((mask & smrs[i].mask) == mask &&
+ !((id ^ smrs[i].id) & ~smrs[i].mask))
+ return i;
+ /*
+ * If the new entry has any other overlap with an existing one,
+ * though, then there always exists at least one stream ID
+ * which would cause a conflict, and we can't allow that risk.
+ */
+ if (!((id ^ smrs[i].id) & ~(smrs[i].mask | mask)))
+ return -EINVAL;
}
- if (!smrs)
- return 0;
+ return free_idx;
+}
+
+static bool arm_smmu_free_sme(struct arm_smmu_device *smmu, int idx)
+{
+ if (--smmu->s2crs[idx].count)
+ return false;
+
+ smmu->s2crs[idx] = s2cr_init_val;
+ if (smmu->smrs)
+ smmu->smrs[idx].valid = false;
+
+ return true;
+}
+
+static int arm_smmu_master_alloc_smes(struct device *dev)
+{
+ struct arm_smmu_master_cfg *cfg = dev->archdata.iommu;
+ struct arm_smmu_device *smmu = cfg->smmu;
+ struct arm_smmu_smr *smrs = smmu->smrs;
+ struct iommu_group *group;
+ int i, idx, ret;
+
+ mutex_lock(&smmu->stream_map_mutex);
+ /* Figure out a viable stream map entry allocation */
+ for_each_cfg_sme(cfg, i, idx) {
+ if (idx != INVALID_SMENDX) {
+ ret = -EEXIST;
+ goto out_err;
+ }
+
+ ret = arm_smmu_find_sme(smmu, cfg->streamids[i], 0);
+ if (ret < 0)
+ goto out_err;
+
+ idx = ret;
+ if (smrs && smmu->s2crs[idx].count == 0) {
+ smrs[idx].id = cfg->streamids[i];
+ smrs[idx].mask = 0; /* We don't currently share SMRs */
+ smrs[idx].valid = true;
+ }
+ smmu->s2crs[idx].count++;
+ cfg->smendx[i] = (s16)idx;
+ }
+
+ group = iommu_group_get_for_dev(dev);
+ if (!group)
+ group = ERR_PTR(-ENOMEM);
+ if (IS_ERR(group)) {
+ ret = PTR_ERR(group);
+ goto out_err;
+ }
+ iommu_group_put(group);
/* It worked! Now, poke the actual hardware */
- for_each_cfg_sme(cfg, i, idx)
- arm_smmu_write_smr(smmu, idx);
+ for_each_cfg_sme(cfg, i, idx) {
+ arm_smmu_write_sme(smmu, idx);
+ smmu->s2crs[idx].group = group;
+ }
+ mutex_unlock(&smmu->stream_map_mutex);
return 0;
-err_free_smrs:
+out_err:
while (i--) {
- arm_smmu_free_smr(smmu, cfg->smendx[i]);
+ arm_smmu_free_sme(smmu, cfg->smendx[i]);
cfg->smendx[i] = INVALID_SMENDX;
}
- return -ENOSPC;
+ mutex_unlock(&smmu->stream_map_mutex);
+ return ret;
}
static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
@@ -1135,43 +1187,23 @@ static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
struct arm_smmu_device *smmu = cfg->smmu;
int i, idx;
- /*
- * We *must* clear the S2CR first, because freeing the SMR means
- * that it can be re-allocated immediately.
- */
+ mutex_lock(&smmu->stream_map_mutex);
for_each_cfg_sme(cfg, i, idx) {
- /* An IOMMU group is torn down by the first device to be removed */
- if (idx == INVALID_SMENDX)
- return;
-
- smmu->s2crs[idx] = s2cr_init_val;
- arm_smmu_write_s2cr(smmu, idx);
- }
- /* Sync S2CR updates before touching anything else */
- __iowmb();
-
- /* Invalidate the SMRs before freeing back to the allocator */
- for_each_cfg_sme(cfg, i, idx) {
- if (smmu->smrs)
- arm_smmu_free_smr(smmu, idx);
-
+ if (arm_smmu_free_sme(smmu, idx))
+ arm_smmu_write_sme(smmu, idx);
cfg->smendx[i] = INVALID_SMENDX;
}
+ mutex_unlock(&smmu->stream_map_mutex);
}
static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
struct arm_smmu_master_cfg *cfg)
{
- int i, idx, ret = 0;
struct arm_smmu_device *smmu = smmu_domain->smmu;
struct arm_smmu_s2cr *s2cr = smmu->s2crs;
enum arm_smmu_s2cr_type type = S2CR_TYPE_TRANS;
u8 cbndx = smmu_domain->cfg.cbndx;
-
- if (cfg->smendx[0] == INVALID_SMENDX)
- ret = arm_smmu_master_alloc_smes(smmu, cfg);
- if (ret)
- return ret;
+ int i, idx;
/*
* FIXME: This won't be needed once we have IOMMU-backed DMA ops
@@ -1183,9 +1215,8 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
type = S2CR_TYPE_BYPASS;
for_each_cfg_sme(cfg, i, idx) {
- /* Devices in an IOMMU group may already be configured */
if (type == s2cr[idx].type && cbndx == s2cr[idx].cbndx)
- break;
+ continue;
s2cr[idx].type = type;
s2cr[idx].privcfg = S2CR_PRIVCFG_UNPRIV;
@@ -1345,7 +1376,6 @@ static bool arm_smmu_capable(enum iommu_cap cap)
static int arm_smmu_add_device(struct device *dev)
{
struct arm_smmu_master_cfg *cfg;
- struct iommu_group *group;
int i, ret;
ret = arm_smmu_register_legacy_master(dev);
@@ -1365,13 +1395,9 @@ static int arm_smmu_add_device(struct device *dev)
cfg->smendx[i] = INVALID_SMENDX;
}
- group = iommu_group_get_for_dev(dev);
- if (IS_ERR(group)) {
- ret = PTR_ERR(group);
- goto out_free;
- }
- iommu_group_put(group);
- return 0;
+ ret = arm_smmu_master_alloc_smes(dev);
+ if (!ret)
+ return ret;
out_free:
kfree(cfg);
@@ -1394,7 +1420,21 @@ static void arm_smmu_remove_device(struct device *dev)
static struct iommu_group *arm_smmu_device_group(struct device *dev)
{
- struct iommu_group *group;
+ struct arm_smmu_master_cfg *cfg = dev->archdata.iommu;
+ struct arm_smmu_device *smmu = cfg->smmu;
+ struct iommu_group *group = NULL;
+ int i, idx;
+
+ for_each_cfg_sme(cfg, i, idx) {
+ if (group && smmu->s2crs[idx].group &&
+ group != smmu->s2crs[idx].group)
+ return ERR_PTR(-EINVAL);
+
+ group = smmu->s2crs[idx].group;
+ }
+
+ if (group)
+ return group;
if (dev_is_pci(dev))
group = pci_device_group(dev);
@@ -1677,6 +1717,7 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
smmu->s2crs[i] = s2cr_init_val;
smmu->num_mapping_groups = size;
+ mutex_init(&smmu->stream_map_mutex);
if (smmu->version < ARM_SMMU_V2 || !(id & ID0_PTFS_NO_AARCH32)) {
smmu->features |= ARM_SMMU_FEAT_FMT_AARCH32_L;
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 15/20] iommu/arm-smmu: Convert to iommu_fwspec
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
In the final step of preparation for full generic configuration support,
swap our fixed-size master_cfg for the generic iommu_fwspec. For the
legacy DT bindings, the driver simply gets to act as its own 'firmware'.
Farewell, arbitrary MAX_MASTER_STREAMIDS!
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
- Fix dereference-before-null-check behaviour
---
drivers/iommu/arm-smmu.c | 140 ++++++++++++++++++++++++++---------------------
1 file changed, 78 insertions(+), 62 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 0e7dbf59335d..de09b73caf7f 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -42,6 +42,7 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
+#include <linux/of_iommu.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@@ -51,9 +52,6 @@
#include "io-pgtable.h"
-/* Maximum number of stream IDs assigned to a single device */
-#define MAX_MASTER_STREAMIDS 128
-
/* Maximum number of context banks per SMMU */
#define ARM_SMMU_MAX_CBS 128
@@ -321,13 +319,13 @@ struct arm_smmu_smr {
struct arm_smmu_master_cfg {
struct arm_smmu_device *smmu;
- int num_streamids;
- u16 streamids[MAX_MASTER_STREAMIDS];
- s16 smendx[MAX_MASTER_STREAMIDS];
+ s16 smendx[];
};
#define INVALID_SMENDX -1
-#define for_each_cfg_sme(cfg, i, idx) \
- for (i = 0; idx = cfg->smendx[i], i < cfg->num_streamids; ++i)
+#define __fwspec_cfg(fw) ((struct arm_smmu_master_cfg *)fw->iommu_priv)
+#define fwspec_smmu(fw) (__fwspec_cfg(fw)->smmu)
+#define for_each_cfg_sme(fw, i, idx) \
+ for (i = 0; idx = __fwspec_cfg(fw)->smendx[i], i < fw->num_ids; ++i)
struct arm_smmu_device {
struct device *dev;
@@ -481,13 +479,14 @@ static int __find_legacy_master_phandle(struct device *dev, void *data)
static struct platform_driver arm_smmu_driver;
-static int arm_smmu_register_legacy_master(struct device *dev)
+static int arm_smmu_register_legacy_master(struct device *dev,
+ struct arm_smmu_device **smmu)
{
- struct arm_smmu_device *smmu;
- struct arm_smmu_master_cfg *cfg;
+ struct device *smmu_dev;
struct device_node *np;
struct of_phandle_iterator it;
void *data = ⁢
+ u32 *sids;
__be32 pci_sid;
int err;
@@ -500,20 +499,13 @@ static int arm_smmu_register_legacy_master(struct device *dev)
it.node = np;
err = driver_for_each_device(&arm_smmu_driver.driver, NULL, &data,
__find_legacy_master_phandle);
+ smmu_dev = data;
of_node_put(np);
if (err == 0)
return -ENODEV;
if (err < 0)
return err;
- smmu = dev_get_drvdata(data);
-
- if (it.cur_count > MAX_MASTER_STREAMIDS) {
- dev_err(smmu->dev,
- "reached maximum number (%d) of stream IDs for master device %s\n",
- MAX_MASTER_STREAMIDS, dev_name(dev));
- return -ENOSPC;
- }
if (dev_is_pci(dev)) {
/* "mmu-masters" assumes Stream ID == Requester ID */
pci_for_each_dma_alias(to_pci_dev(dev), __arm_smmu_get_pci_sid,
@@ -522,17 +514,19 @@ static int arm_smmu_register_legacy_master(struct device *dev)
it.cur_count = 1;
}
- cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
- if (!cfg)
+ err = iommu_fwspec_init(dev, smmu_dev->of_node);
+ if (err)
+ return err;
+
+ sids = kcalloc(it.cur_count, sizeof(*sids), GFP_KERNEL);
+ if (!sids)
return -ENOMEM;
- cfg->smmu = smmu;
- dev->archdata.iommu = cfg;
-
- while (it.cur_count--)
- cfg->streamids[cfg->num_streamids++] = be32_to_cpup(it.cur++);
-
- return 0;
+ *smmu = dev_get_drvdata(smmu_dev);
+ of_phandle_iterator_args(&it, sids, it.cur_count);
+ err = iommu_fwspec_add_ids(dev, sids, it.cur_count);
+ kfree(sids);
+ return err;
}
static int __arm_smmu_alloc_bitmap(unsigned long *map, int start, int end)
@@ -1127,7 +1121,8 @@ static bool arm_smmu_free_sme(struct arm_smmu_device *smmu, int idx)
static int arm_smmu_master_alloc_smes(struct device *dev)
{
- struct arm_smmu_master_cfg *cfg = dev->archdata.iommu;
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
+ struct arm_smmu_master_cfg *cfg = fwspec->iommu_priv;
struct arm_smmu_device *smmu = cfg->smmu;
struct arm_smmu_smr *smrs = smmu->smrs;
struct iommu_group *group;
@@ -1135,19 +1130,19 @@ static int arm_smmu_master_alloc_smes(struct device *dev)
mutex_lock(&smmu->stream_map_mutex);
/* Figure out a viable stream map entry allocation */
- for_each_cfg_sme(cfg, i, idx) {
+ for_each_cfg_sme(fwspec, i, idx) {
if (idx != INVALID_SMENDX) {
ret = -EEXIST;
goto out_err;
}
- ret = arm_smmu_find_sme(smmu, cfg->streamids[i], 0);
+ ret = arm_smmu_find_sme(smmu, fwspec->ids[i], 0);
if (ret < 0)
goto out_err;
idx = ret;
if (smrs && smmu->s2crs[idx].count == 0) {
- smrs[idx].id = cfg->streamids[i];
+ smrs[idx].id = fwspec->ids[i];
smrs[idx].mask = 0; /* We don't currently share SMRs */
smrs[idx].valid = true;
}
@@ -1165,7 +1160,7 @@ static int arm_smmu_master_alloc_smes(struct device *dev)
iommu_group_put(group);
/* It worked! Now, poke the actual hardware */
- for_each_cfg_sme(cfg, i, idx) {
+ for_each_cfg_sme(fwspec, i, idx) {
arm_smmu_write_sme(smmu, idx);
smmu->s2crs[idx].group = group;
}
@@ -1182,13 +1177,14 @@ out_err:
return ret;
}
-static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
+static void arm_smmu_master_free_smes(struct iommu_fwspec *fwspec)
{
- struct arm_smmu_device *smmu = cfg->smmu;
+ struct arm_smmu_device *smmu = fwspec_smmu(fwspec);
+ struct arm_smmu_master_cfg *cfg = fwspec->iommu_priv;
int i, idx;
mutex_lock(&smmu->stream_map_mutex);
- for_each_cfg_sme(cfg, i, idx) {
+ for_each_cfg_sme(fwspec, i, idx) {
if (arm_smmu_free_sme(smmu, idx))
arm_smmu_write_sme(smmu, idx);
cfg->smendx[i] = INVALID_SMENDX;
@@ -1197,7 +1193,7 @@ static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
}
static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
- struct arm_smmu_master_cfg *cfg)
+ struct iommu_fwspec *fwspec)
{
struct arm_smmu_device *smmu = smmu_domain->smmu;
struct arm_smmu_s2cr *s2cr = smmu->s2crs;
@@ -1214,7 +1210,7 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
if (smmu_domain->domain.type == IOMMU_DOMAIN_DMA)
type = S2CR_TYPE_BYPASS;
- for_each_cfg_sme(cfg, i, idx) {
+ for_each_cfg_sme(fwspec, i, idx) {
if (type == s2cr[idx].type && cbndx == s2cr[idx].cbndx)
continue;
@@ -1226,19 +1222,23 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
return 0;
}
+static struct iommu_ops arm_smmu_ops;
+
static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
{
int ret;
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
+ struct arm_smmu_device *smmu;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
- struct arm_smmu_master_cfg *cfg = dev->archdata.iommu;
- if (!cfg) {
+ if (!fwspec || fwspec->iommu_ops != &arm_smmu_ops) {
dev_err(dev, "cannot attach to SMMU, is it on the same bus?\n");
return -ENXIO;
}
+ smmu = fwspec_smmu(fwspec);
/* Ensure that the domain is finalised */
- ret = arm_smmu_init_domain_context(domain, cfg->smmu);
+ ret = arm_smmu_init_domain_context(domain, smmu);
if (ret < 0)
return ret;
@@ -1246,15 +1246,15 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
* Sanity check the domain. We don't support domains across
* different SMMUs.
*/
- if (smmu_domain->smmu != cfg->smmu) {
+ if (smmu_domain->smmu != smmu) {
dev_err(dev,
"cannot attach to SMMU %s whilst already attached to domain on SMMU %s\n",
- dev_name(smmu_domain->smmu->dev), dev_name(cfg->smmu->dev));
+ dev_name(smmu_domain->smmu->dev), dev_name(smmu->dev));
return -EINVAL;
}
/* Looks ok, so add the device to the domain */
- return arm_smmu_domain_add_master(smmu_domain, cfg);
+ return arm_smmu_domain_add_master(smmu_domain, fwspec);
}
static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
@@ -1375,57 +1375,72 @@ static bool arm_smmu_capable(enum iommu_cap cap)
static int arm_smmu_add_device(struct device *dev)
{
+ struct arm_smmu_device *smmu;
struct arm_smmu_master_cfg *cfg;
+ struct iommu_fwspec *fwspec;
int i, ret;
- ret = arm_smmu_register_legacy_master(dev);
- cfg = dev->archdata.iommu;
+ ret = arm_smmu_register_legacy_master(dev, &smmu);
+ fwspec = dev_iommu_fwspec(dev);
if (ret)
goto out_free;
ret = -EINVAL;
- for (i = 0; i < cfg->num_streamids; i++) {
- u16 sid = cfg->streamids[i];
+ for (i = 0; i < fwspec->num_ids; i++) {
+ u16 sid = fwspec->ids[i];
- if (sid & ~cfg->smmu->streamid_mask) {
+ if (sid & ~smmu->streamid_mask) {
dev_err(dev, "stream ID 0x%x out of range for SMMU (0x%x)\n",
sid, cfg->smmu->streamid_mask);
goto out_free;
}
- cfg->smendx[i] = INVALID_SMENDX;
}
+ ret = -ENOMEM;
+ cfg = kzalloc(offsetof(struct arm_smmu_master_cfg, smendx[i]),
+ GFP_KERNEL);
+ if (!cfg)
+ goto out_free;
+
+ cfg->smmu = smmu;
+ fwspec->iommu_priv = cfg;
+ while (i--)
+ cfg->smendx[i] = INVALID_SMENDX;
+
ret = arm_smmu_master_alloc_smes(dev);
- if (!ret)
- return ret;
+ if (ret)
+ goto out_free;
+
+ return 0;
out_free:
- kfree(cfg);
- dev->archdata.iommu = NULL;
+ if (fwspec)
+ kfree(fwspec->iommu_priv);
+ iommu_fwspec_free(dev);
return ret;
}
static void arm_smmu_remove_device(struct device *dev)
{
- struct arm_smmu_master_cfg *cfg = dev->archdata.iommu;
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
- if (!cfg)
+ if (!fwspec || fwspec->iommu_ops != &arm_smmu_ops)
return;
- arm_smmu_master_free_smes(cfg);
+ arm_smmu_master_free_smes(fwspec);
iommu_group_remove_device(dev);
- kfree(cfg);
- dev->archdata.iommu = NULL;
+ kfree(fwspec->iommu_priv);
+ iommu_fwspec_free(dev);
}
static struct iommu_group *arm_smmu_device_group(struct device *dev)
{
- struct arm_smmu_master_cfg *cfg = dev->archdata.iommu;
- struct arm_smmu_device *smmu = cfg->smmu;
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
+ struct arm_smmu_device *smmu = fwspec_smmu(fwspec);
struct iommu_group *group = NULL;
int i, idx;
- for_each_cfg_sme(cfg, i, idx) {
+ for_each_cfg_sme(fwspec, i, idx) {
if (group && smmu->s2crs[idx].group &&
group != smmu->s2crs[idx].group)
return ERR_PTR(-EINVAL);
@@ -1936,6 +1951,7 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
}
}
+ of_iommu_set_ops(dev->of_node, &arm_smmu_ops);
platform_set_drvdata(pdev, smmu);
arm_smmu_device_reset(smmu);
return 0;
--
2.8.1.dirty
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^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 15/20] iommu/arm-smmu: Convert to iommu_fwspec
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
In the final step of preparation for full generic configuration support,
swap our fixed-size master_cfg for the generic iommu_fwspec. For the
legacy DT bindings, the driver simply gets to act as its own 'firmware'.
Farewell, arbitrary MAX_MASTER_STREAMIDS!
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
- Fix dereference-before-null-check behaviour
---
drivers/iommu/arm-smmu.c | 140 ++++++++++++++++++++++++++---------------------
1 file changed, 78 insertions(+), 62 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 0e7dbf59335d..de09b73caf7f 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -42,6 +42,7 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
+#include <linux/of_iommu.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@@ -51,9 +52,6 @@
#include "io-pgtable.h"
-/* Maximum number of stream IDs assigned to a single device */
-#define MAX_MASTER_STREAMIDS 128
-
/* Maximum number of context banks per SMMU */
#define ARM_SMMU_MAX_CBS 128
@@ -321,13 +319,13 @@ struct arm_smmu_smr {
struct arm_smmu_master_cfg {
struct arm_smmu_device *smmu;
- int num_streamids;
- u16 streamids[MAX_MASTER_STREAMIDS];
- s16 smendx[MAX_MASTER_STREAMIDS];
+ s16 smendx[];
};
#define INVALID_SMENDX -1
-#define for_each_cfg_sme(cfg, i, idx) \
- for (i = 0; idx = cfg->smendx[i], i < cfg->num_streamids; ++i)
+#define __fwspec_cfg(fw) ((struct arm_smmu_master_cfg *)fw->iommu_priv)
+#define fwspec_smmu(fw) (__fwspec_cfg(fw)->smmu)
+#define for_each_cfg_sme(fw, i, idx) \
+ for (i = 0; idx = __fwspec_cfg(fw)->smendx[i], i < fw->num_ids; ++i)
struct arm_smmu_device {
struct device *dev;
@@ -481,13 +479,14 @@ static int __find_legacy_master_phandle(struct device *dev, void *data)
static struct platform_driver arm_smmu_driver;
-static int arm_smmu_register_legacy_master(struct device *dev)
+static int arm_smmu_register_legacy_master(struct device *dev,
+ struct arm_smmu_device **smmu)
{
- struct arm_smmu_device *smmu;
- struct arm_smmu_master_cfg *cfg;
+ struct device *smmu_dev;
struct device_node *np;
struct of_phandle_iterator it;
void *data = ⁢
+ u32 *sids;
__be32 pci_sid;
int err;
@@ -500,20 +499,13 @@ static int arm_smmu_register_legacy_master(struct device *dev)
it.node = np;
err = driver_for_each_device(&arm_smmu_driver.driver, NULL, &data,
__find_legacy_master_phandle);
+ smmu_dev = data;
of_node_put(np);
if (err == 0)
return -ENODEV;
if (err < 0)
return err;
- smmu = dev_get_drvdata(data);
-
- if (it.cur_count > MAX_MASTER_STREAMIDS) {
- dev_err(smmu->dev,
- "reached maximum number (%d) of stream IDs for master device %s\n",
- MAX_MASTER_STREAMIDS, dev_name(dev));
- return -ENOSPC;
- }
if (dev_is_pci(dev)) {
/* "mmu-masters" assumes Stream ID == Requester ID */
pci_for_each_dma_alias(to_pci_dev(dev), __arm_smmu_get_pci_sid,
@@ -522,17 +514,19 @@ static int arm_smmu_register_legacy_master(struct device *dev)
it.cur_count = 1;
}
- cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
- if (!cfg)
+ err = iommu_fwspec_init(dev, smmu_dev->of_node);
+ if (err)
+ return err;
+
+ sids = kcalloc(it.cur_count, sizeof(*sids), GFP_KERNEL);
+ if (!sids)
return -ENOMEM;
- cfg->smmu = smmu;
- dev->archdata.iommu = cfg;
-
- while (it.cur_count--)
- cfg->streamids[cfg->num_streamids++] = be32_to_cpup(it.cur++);
-
- return 0;
+ *smmu = dev_get_drvdata(smmu_dev);
+ of_phandle_iterator_args(&it, sids, it.cur_count);
+ err = iommu_fwspec_add_ids(dev, sids, it.cur_count);
+ kfree(sids);
+ return err;
}
static int __arm_smmu_alloc_bitmap(unsigned long *map, int start, int end)
@@ -1127,7 +1121,8 @@ static bool arm_smmu_free_sme(struct arm_smmu_device *smmu, int idx)
static int arm_smmu_master_alloc_smes(struct device *dev)
{
- struct arm_smmu_master_cfg *cfg = dev->archdata.iommu;
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
+ struct arm_smmu_master_cfg *cfg = fwspec->iommu_priv;
struct arm_smmu_device *smmu = cfg->smmu;
struct arm_smmu_smr *smrs = smmu->smrs;
struct iommu_group *group;
@@ -1135,19 +1130,19 @@ static int arm_smmu_master_alloc_smes(struct device *dev)
mutex_lock(&smmu->stream_map_mutex);
/* Figure out a viable stream map entry allocation */
- for_each_cfg_sme(cfg, i, idx) {
+ for_each_cfg_sme(fwspec, i, idx) {
if (idx != INVALID_SMENDX) {
ret = -EEXIST;
goto out_err;
}
- ret = arm_smmu_find_sme(smmu, cfg->streamids[i], 0);
+ ret = arm_smmu_find_sme(smmu, fwspec->ids[i], 0);
if (ret < 0)
goto out_err;
idx = ret;
if (smrs && smmu->s2crs[idx].count == 0) {
- smrs[idx].id = cfg->streamids[i];
+ smrs[idx].id = fwspec->ids[i];
smrs[idx].mask = 0; /* We don't currently share SMRs */
smrs[idx].valid = true;
}
@@ -1165,7 +1160,7 @@ static int arm_smmu_master_alloc_smes(struct device *dev)
iommu_group_put(group);
/* It worked! Now, poke the actual hardware */
- for_each_cfg_sme(cfg, i, idx) {
+ for_each_cfg_sme(fwspec, i, idx) {
arm_smmu_write_sme(smmu, idx);
smmu->s2crs[idx].group = group;
}
@@ -1182,13 +1177,14 @@ out_err:
return ret;
}
-static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
+static void arm_smmu_master_free_smes(struct iommu_fwspec *fwspec)
{
- struct arm_smmu_device *smmu = cfg->smmu;
+ struct arm_smmu_device *smmu = fwspec_smmu(fwspec);
+ struct arm_smmu_master_cfg *cfg = fwspec->iommu_priv;
int i, idx;
mutex_lock(&smmu->stream_map_mutex);
- for_each_cfg_sme(cfg, i, idx) {
+ for_each_cfg_sme(fwspec, i, idx) {
if (arm_smmu_free_sme(smmu, idx))
arm_smmu_write_sme(smmu, idx);
cfg->smendx[i] = INVALID_SMENDX;
@@ -1197,7 +1193,7 @@ static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
}
static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
- struct arm_smmu_master_cfg *cfg)
+ struct iommu_fwspec *fwspec)
{
struct arm_smmu_device *smmu = smmu_domain->smmu;
struct arm_smmu_s2cr *s2cr = smmu->s2crs;
@@ -1214,7 +1210,7 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
if (smmu_domain->domain.type == IOMMU_DOMAIN_DMA)
type = S2CR_TYPE_BYPASS;
- for_each_cfg_sme(cfg, i, idx) {
+ for_each_cfg_sme(fwspec, i, idx) {
if (type == s2cr[idx].type && cbndx == s2cr[idx].cbndx)
continue;
@@ -1226,19 +1222,23 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
return 0;
}
+static struct iommu_ops arm_smmu_ops;
+
static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
{
int ret;
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
+ struct arm_smmu_device *smmu;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
- struct arm_smmu_master_cfg *cfg = dev->archdata.iommu;
- if (!cfg) {
+ if (!fwspec || fwspec->iommu_ops != &arm_smmu_ops) {
dev_err(dev, "cannot attach to SMMU, is it on the same bus?\n");
return -ENXIO;
}
+ smmu = fwspec_smmu(fwspec);
/* Ensure that the domain is finalised */
- ret = arm_smmu_init_domain_context(domain, cfg->smmu);
+ ret = arm_smmu_init_domain_context(domain, smmu);
if (ret < 0)
return ret;
@@ -1246,15 +1246,15 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
* Sanity check the domain. We don't support domains across
* different SMMUs.
*/
- if (smmu_domain->smmu != cfg->smmu) {
+ if (smmu_domain->smmu != smmu) {
dev_err(dev,
"cannot attach to SMMU %s whilst already attached to domain on SMMU %s\n",
- dev_name(smmu_domain->smmu->dev), dev_name(cfg->smmu->dev));
+ dev_name(smmu_domain->smmu->dev), dev_name(smmu->dev));
return -EINVAL;
}
/* Looks ok, so add the device to the domain */
- return arm_smmu_domain_add_master(smmu_domain, cfg);
+ return arm_smmu_domain_add_master(smmu_domain, fwspec);
}
static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
@@ -1375,57 +1375,72 @@ static bool arm_smmu_capable(enum iommu_cap cap)
static int arm_smmu_add_device(struct device *dev)
{
+ struct arm_smmu_device *smmu;
struct arm_smmu_master_cfg *cfg;
+ struct iommu_fwspec *fwspec;
int i, ret;
- ret = arm_smmu_register_legacy_master(dev);
- cfg = dev->archdata.iommu;
+ ret = arm_smmu_register_legacy_master(dev, &smmu);
+ fwspec = dev_iommu_fwspec(dev);
if (ret)
goto out_free;
ret = -EINVAL;
- for (i = 0; i < cfg->num_streamids; i++) {
- u16 sid = cfg->streamids[i];
+ for (i = 0; i < fwspec->num_ids; i++) {
+ u16 sid = fwspec->ids[i];
- if (sid & ~cfg->smmu->streamid_mask) {
+ if (sid & ~smmu->streamid_mask) {
dev_err(dev, "stream ID 0x%x out of range for SMMU (0x%x)\n",
sid, cfg->smmu->streamid_mask);
goto out_free;
}
- cfg->smendx[i] = INVALID_SMENDX;
}
+ ret = -ENOMEM;
+ cfg = kzalloc(offsetof(struct arm_smmu_master_cfg, smendx[i]),
+ GFP_KERNEL);
+ if (!cfg)
+ goto out_free;
+
+ cfg->smmu = smmu;
+ fwspec->iommu_priv = cfg;
+ while (i--)
+ cfg->smendx[i] = INVALID_SMENDX;
+
ret = arm_smmu_master_alloc_smes(dev);
- if (!ret)
- return ret;
+ if (ret)
+ goto out_free;
+
+ return 0;
out_free:
- kfree(cfg);
- dev->archdata.iommu = NULL;
+ if (fwspec)
+ kfree(fwspec->iommu_priv);
+ iommu_fwspec_free(dev);
return ret;
}
static void arm_smmu_remove_device(struct device *dev)
{
- struct arm_smmu_master_cfg *cfg = dev->archdata.iommu;
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
- if (!cfg)
+ if (!fwspec || fwspec->iommu_ops != &arm_smmu_ops)
return;
- arm_smmu_master_free_smes(cfg);
+ arm_smmu_master_free_smes(fwspec);
iommu_group_remove_device(dev);
- kfree(cfg);
- dev->archdata.iommu = NULL;
+ kfree(fwspec->iommu_priv);
+ iommu_fwspec_free(dev);
}
static struct iommu_group *arm_smmu_device_group(struct device *dev)
{
- struct arm_smmu_master_cfg *cfg = dev->archdata.iommu;
- struct arm_smmu_device *smmu = cfg->smmu;
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
+ struct arm_smmu_device *smmu = fwspec_smmu(fwspec);
struct iommu_group *group = NULL;
int i, idx;
- for_each_cfg_sme(cfg, i, idx) {
+ for_each_cfg_sme(fwspec, i, idx) {
if (group && smmu->s2crs[idx].group &&
group != smmu->s2crs[idx].group)
return ERR_PTR(-EINVAL);
@@ -1936,6 +1951,7 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
}
}
+ of_iommu_set_ops(dev->of_node, &arm_smmu_ops);
platform_set_drvdata(pdev, smmu);
arm_smmu_device_reset(smmu);
return 0;
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 16/20] Docs: dt: document ARM SMMU generic binding usage
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
Document how the generic "iommus" binding should be used to describe ARM
SMMU stream IDs instead of the old "mmu-masters" binding.
Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
- Remove missed reference to old "mmu-masters" example
---
.../devicetree/bindings/iommu/arm,smmu.txt | 63 ++++++++++++++++------
1 file changed, 48 insertions(+), 15 deletions(-)
diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.txt b/Documentation/devicetree/bindings/iommu/arm,smmu.txt
index 19fe6f2c83f6..e862d1485205 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu.txt
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu.txt
@@ -35,12 +35,16 @@ conditions.
interrupt per context bank. In the case of a single,
combined interrupt, it must be listed multiple times.
-- mmu-masters : A list of phandles to device nodes representing bus
- masters for which the SMMU can provide a translation
- and their corresponding StreamIDs (see example below).
- Each device node linked from this list must have a
- "#stream-id-cells" property, indicating the number of
- StreamIDs associated with it.
+- #iommu-cells : See Documentation/devicetree/bindings/iommu/iommu.txt
+ for details. With a value of 1, each "iommus" entry
+ represents a distinct stream ID emitted by that device
+ into the relevant SMMU.
+
+ SMMUs with stream matching support and complex masters
+ may use a value of 2, where the second cell represents
+ an SMR mask to combine with the ID in the first cell.
+ Care must be taken to ensure the set of matched IDs
+ does not result in conflicts.
** System MMU optional properties:
@@ -56,9 +60,20 @@ conditions.
aliases of secure registers have to be used during
SMMU configuration.
-Example:
+** Deprecated properties:
- smmu {
+- mmu-masters (deprecated in favour of the generic "iommus" binding) :
+ A list of phandles to device nodes representing bus
+ masters for which the SMMU can provide a translation
+ and their corresponding Stream IDs. Each device node
+ linked from this list must have a "#stream-id-cells"
+ property, indicating the number of Stream ID
+ arguments associated with its phandle.
+
+** Examples:
+
+ /* SMMU with stream matching or stream indexing */
+ smmu1: iommu {
compatible = "arm,smmu-v1";
reg = <0xba5e0000 0x10000>;
#global-interrupts = <2>;
@@ -68,11 +83,29 @@ Example:
<0 35 4>,
<0 36 4>,
<0 37 4>;
-
- /*
- * Two DMA controllers, the first with two StreamIDs (0xd01d
- * and 0xd01e) and the second with only one (0xd11c).
- */
- mmu-masters = <&dma0 0xd01d 0xd01e>,
- <&dma1 0xd11c>;
+ #iommu-cells = <1>;
+ };
+
+ /* device with two stream IDs, 0 and 7 */
+ master1 {
+ iommus = <&smmu1 0>,
+ <&smmu1 7>;
+ };
+
+
+ /* SMMU with stream matching */
+ smmu2: iommu {
+ ...
+ #iommu-cells = <2>;
+ };
+
+ /* device with stream IDs 0 and 7 */
+ master2 {
+ iommus = <&smmu2 0 0>,
+ <&smmu2 7 0>;
+ };
+
+ /* device with stream IDs 1, 17, 33 and 49 */
+ master3 {
+ iommus = <&smmu2 1 0x30>;
};
--
2.8.1.dirty
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^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 16/20] Docs: dt: document ARM SMMU generic binding usage
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
Document how the generic "iommus" binding should be used to describe ARM
SMMU stream IDs instead of the old "mmu-masters" binding.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
- Remove missed reference to old "mmu-masters" example
---
.../devicetree/bindings/iommu/arm,smmu.txt | 63 ++++++++++++++++------
1 file changed, 48 insertions(+), 15 deletions(-)
diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.txt b/Documentation/devicetree/bindings/iommu/arm,smmu.txt
index 19fe6f2c83f6..e862d1485205 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu.txt
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu.txt
@@ -35,12 +35,16 @@ conditions.
interrupt per context bank. In the case of a single,
combined interrupt, it must be listed multiple times.
-- mmu-masters : A list of phandles to device nodes representing bus
- masters for which the SMMU can provide a translation
- and their corresponding StreamIDs (see example below).
- Each device node linked from this list must have a
- "#stream-id-cells" property, indicating the number of
- StreamIDs associated with it.
+- #iommu-cells : See Documentation/devicetree/bindings/iommu/iommu.txt
+ for details. With a value of 1, each "iommus" entry
+ represents a distinct stream ID emitted by that device
+ into the relevant SMMU.
+
+ SMMUs with stream matching support and complex masters
+ may use a value of 2, where the second cell represents
+ an SMR mask to combine with the ID in the first cell.
+ Care must be taken to ensure the set of matched IDs
+ does not result in conflicts.
** System MMU optional properties:
@@ -56,9 +60,20 @@ conditions.
aliases of secure registers have to be used during
SMMU configuration.
-Example:
+** Deprecated properties:
- smmu {
+- mmu-masters (deprecated in favour of the generic "iommus" binding) :
+ A list of phandles to device nodes representing bus
+ masters for which the SMMU can provide a translation
+ and their corresponding Stream IDs. Each device node
+ linked from this list must have a "#stream-id-cells"
+ property, indicating the number of Stream ID
+ arguments associated with its phandle.
+
+** Examples:
+
+ /* SMMU with stream matching or stream indexing */
+ smmu1: iommu {
compatible = "arm,smmu-v1";
reg = <0xba5e0000 0x10000>;
#global-interrupts = <2>;
@@ -68,11 +83,29 @@ Example:
<0 35 4>,
<0 36 4>,
<0 37 4>;
-
- /*
- * Two DMA controllers, the first with two StreamIDs (0xd01d
- * and 0xd01e) and the second with only one (0xd11c).
- */
- mmu-masters = <&dma0 0xd01d 0xd01e>,
- <&dma1 0xd11c>;
+ #iommu-cells = <1>;
+ };
+
+ /* device with two stream IDs, 0 and 7 */
+ master1 {
+ iommus = <&smmu1 0>,
+ <&smmu1 7>;
+ };
+
+
+ /* SMMU with stream matching */
+ smmu2: iommu {
+ ...
+ #iommu-cells = <2>;
+ };
+
+ /* device with stream IDs 0 and 7 */
+ master2 {
+ iommus = <&smmu2 0 0>,
+ <&smmu2 7 0>;
+ };
+
+ /* device with stream IDs 1, 17, 33 and 49 */
+ master3 {
+ iommus = <&smmu2 1 0x30>;
};
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 17/20] iommu/arm-smmu: Wire up generic configuration support
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
With everything else now in place, fill in an of_xlate callback and the
appropriate registration to plumb into the generic configuration
machinery, and watch everything just work.
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
- Entirely disallow mixing old and new bindings
---
drivers/iommu/arm-smmu.c | 172 ++++++++++++++++++++++++++++++-----------------
1 file changed, 112 insertions(+), 60 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index de09b73caf7f..aaf7d92448a3 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -43,6 +43,7 @@
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_iommu.h>
+#include <linux/of_platform.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@@ -418,6 +419,8 @@ struct arm_smmu_option_prop {
static atomic_t cavium_smmu_context_count = ATOMIC_INIT(0);
+static bool using_legacy_binding, using_generic_binding;
+
static struct arm_smmu_option_prop arm_smmu_options[] = {
{ ARM_SMMU_OPT_SECURE_CFG_ACCESS, "calxeda,smmu-secure-config-access" },
{ 0, NULL},
@@ -815,12 +818,6 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
if (smmu_domain->smmu)
goto out_unlock;
- /* We're bypassing these SIDs, so don't allocate an actual context */
- if (domain->type == IOMMU_DOMAIN_DMA) {
- smmu_domain->smmu = smmu;
- goto out_unlock;
- }
-
/*
* Mapping the requested stage onto what we support is surprisingly
* complicated, mainly because the spec allows S1+S2 SMMUs without
@@ -979,7 +976,7 @@ static void arm_smmu_destroy_domain_context(struct iommu_domain *domain)
void __iomem *cb_base;
int irq;
- if (!smmu || domain->type == IOMMU_DOMAIN_DMA)
+ if (!smmu)
return;
/*
@@ -1013,8 +1010,8 @@ static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
if (!smmu_domain)
return NULL;
- if (type == IOMMU_DOMAIN_DMA &&
- iommu_get_dma_cookie(&smmu_domain->domain)) {
+ if (type == IOMMU_DOMAIN_DMA && (using_legacy_binding ||
+ iommu_get_dma_cookie(&smmu_domain->domain))) {
kfree(smmu_domain);
return NULL;
}
@@ -1131,19 +1128,22 @@ static int arm_smmu_master_alloc_smes(struct device *dev)
mutex_lock(&smmu->stream_map_mutex);
/* Figure out a viable stream map entry allocation */
for_each_cfg_sme(fwspec, i, idx) {
+ u16 sid = fwspec->ids[i];
+ u16 mask = fwspec->ids[i] >> SMR_MASK_SHIFT;
+
if (idx != INVALID_SMENDX) {
ret = -EEXIST;
goto out_err;
}
- ret = arm_smmu_find_sme(smmu, fwspec->ids[i], 0);
+ ret = arm_smmu_find_sme(smmu, sid, mask);
if (ret < 0)
goto out_err;
idx = ret;
if (smrs && smmu->s2crs[idx].count == 0) {
- smrs[idx].id = fwspec->ids[i];
- smrs[idx].mask = 0; /* We don't currently share SMRs */
+ smrs[idx].id = sid;
+ smrs[idx].mask = mask;
smrs[idx].valid = true;
}
smmu->s2crs[idx].count++;
@@ -1201,15 +1201,6 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
u8 cbndx = smmu_domain->cfg.cbndx;
int i, idx;
- /*
- * FIXME: This won't be needed once we have IOMMU-backed DMA ops
- * for all devices behind the SMMU. Note that we need to take
- * care configuring SMRs for devices both a platform_device and
- * and a PCI device (i.e. a PCI host controller)
- */
- if (smmu_domain->domain.type == IOMMU_DOMAIN_DMA)
- type = S2CR_TYPE_BYPASS;
-
for_each_cfg_sme(fwspec, i, idx) {
if (type == s2cr[idx].type && cbndx == s2cr[idx].cbndx)
continue;
@@ -1373,25 +1364,50 @@ static bool arm_smmu_capable(enum iommu_cap cap)
}
}
+static int arm_smmu_match_node(struct device *dev, void *data)
+{
+ return dev->of_node == data;
+}
+
+static struct arm_smmu_device *arm_smmu_get_by_node(struct device_node *np)
+{
+ struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
+ np, arm_smmu_match_node);
+ put_device(dev);
+ return dev ? dev_get_drvdata(dev) : NULL;
+}
+
static int arm_smmu_add_device(struct device *dev)
{
struct arm_smmu_device *smmu;
struct arm_smmu_master_cfg *cfg;
- struct iommu_fwspec *fwspec;
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
int i, ret;
- ret = arm_smmu_register_legacy_master(dev, &smmu);
- fwspec = dev_iommu_fwspec(dev);
- if (ret)
- goto out_free;
+ if (using_legacy_binding) {
+ ret = arm_smmu_register_legacy_master(dev, &smmu);
+ fwspec = dev_iommu_fwspec(dev);
+ if (ret)
+ goto out_free;
+ } else if (fwspec) {
+ smmu = arm_smmu_get_by_node(fwspec->iommu_np);
+ } else {
+ return -ENODEV;
+ }
ret = -EINVAL;
for (i = 0; i < fwspec->num_ids; i++) {
u16 sid = fwspec->ids[i];
+ u16 mask = fwspec->ids[i] >> SMR_MASK_SHIFT;
if (sid & ~smmu->streamid_mask) {
dev_err(dev, "stream ID 0x%x out of range for SMMU (0x%x)\n",
- sid, cfg->smmu->streamid_mask);
+ sid, smmu->streamid_mask);
+ goto out_free;
+ }
+ if (mask & ~smmu->smr_mask_mask) {
+ dev_err(dev, "SMR mask 0x%x out of range for SMMU (0x%x)\n",
+ sid, smmu->smr_mask_mask);
goto out_free;
}
}
@@ -1503,6 +1519,23 @@ out_unlock:
return ret;
}
+static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
+{
+ u32 fwid = 0;
+ int ret = iommu_fwspec_init(dev, args->np);
+
+ if (ret)
+ return ret;
+
+ if (args->args_count > 0)
+ fwid |= (u16)args->args[0];
+
+ if (args->args_count > 1)
+ fwid |= (u16)args->args[1] << SMR_MASK_SHIFT;
+
+ return iommu_fwspec_add_ids(dev, &fwid, 1);
+}
+
static struct iommu_ops arm_smmu_ops = {
.capable = arm_smmu_capable,
.domain_alloc = arm_smmu_domain_alloc,
@@ -1517,6 +1550,7 @@ static struct iommu_ops arm_smmu_ops = {
.device_group = arm_smmu_device_group,
.domain_get_attr = arm_smmu_domain_get_attr,
.domain_set_attr = arm_smmu_domain_set_attr,
+ .of_xlate = arm_smmu_of_xlate,
.pgsize_bitmap = -1UL, /* Restricted during device attach */
};
@@ -1870,6 +1904,18 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
struct arm_smmu_device *smmu;
struct device *dev = &pdev->dev;
int num_irqs, i, err;
+ bool legacy_binding;
+
+ legacy_binding = of_find_property(dev->of_node, "mmu-masters", NULL);
+ if (legacy_binding && !using_generic_binding) {
+ pr_notice("deprecated \"mmu-masters\" DT property in use; DMA API support unavailable\n");
+ using_legacy_binding = true;
+ } else if (!legacy_binding && !using_legacy_binding) {
+ using_generic_binding = true;
+ } else {
+ dev_err(dev, "not probing due to mismatched DT properties\n");
+ return -ENODEV;
+ }
smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL);
if (!smmu) {
@@ -1954,6 +2000,20 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
of_iommu_set_ops(dev->of_node, &arm_smmu_ops);
platform_set_drvdata(pdev, smmu);
arm_smmu_device_reset(smmu);
+
+ /* Oh, for a proper bus abstraction */
+ if (!iommu_present(&platform_bus_type))
+ bus_set_iommu(&platform_bus_type, &arm_smmu_ops);
+#ifdef CONFIG_ARM_AMBA
+ if (!iommu_present(&amba_bustype))
+ bus_set_iommu(&amba_bustype, &arm_smmu_ops);
+#endif
+#ifdef CONFIG_PCI
+ if (!iommu_present(&pci_bus_type)) {
+ pci_request_acs();
+ bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
+ }
+#endif
return 0;
}
@@ -1983,41 +2043,14 @@ static struct platform_driver arm_smmu_driver = {
static int __init arm_smmu_init(void)
{
- struct device_node *np;
- int ret;
+ static bool registered;
+ int ret = 0;
- /*
- * Play nice with systems that don't have an ARM SMMU by checking that
- * an ARM SMMU exists in the system before proceeding with the driver
- * and IOMMU bus operation registration.
- */
- np = of_find_matching_node(NULL, arm_smmu_of_match);
- if (!np)
- return 0;
-
- of_node_put(np);
-
- ret = platform_driver_register(&arm_smmu_driver);
- if (ret)
- return ret;
-
- /* Oh, for a proper bus abstraction */
- if (!iommu_present(&platform_bus_type))
- bus_set_iommu(&platform_bus_type, &arm_smmu_ops);
-
-#ifdef CONFIG_ARM_AMBA
- if (!iommu_present(&amba_bustype))
- bus_set_iommu(&amba_bustype, &arm_smmu_ops);
-#endif
-
-#ifdef CONFIG_PCI
- if (!iommu_present(&pci_bus_type)) {
- pci_request_acs();
- bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
+ if (!registered) {
+ ret = platform_driver_register(&arm_smmu_driver);
+ registered = !ret;
}
-#endif
-
- return 0;
+ return ret;
}
static void __exit arm_smmu_exit(void)
@@ -2028,6 +2061,25 @@ static void __exit arm_smmu_exit(void)
subsys_initcall(arm_smmu_init);
module_exit(arm_smmu_exit);
+static int __init arm_smmu_of_init(struct device_node *np)
+{
+ int ret = arm_smmu_init();
+
+ if (ret)
+ return ret;
+
+ if (!of_platform_device_create(np, NULL, platform_bus_type.dev_root))
+ return -ENODEV;
+
+ return 0;
+}
+IOMMU_OF_DECLARE(arm_smmuv1, "arm,smmu-v1", arm_smmu_of_init);
+IOMMU_OF_DECLARE(arm_smmuv2, "arm,smmu-v2", arm_smmu_of_init);
+IOMMU_OF_DECLARE(arm_mmu400, "arm,mmu-400", arm_smmu_of_init);
+IOMMU_OF_DECLARE(arm_mmu401, "arm,mmu-401", arm_smmu_of_init);
+IOMMU_OF_DECLARE(arm_mmu500, "arm,mmu-500", arm_smmu_of_init);
+IOMMU_OF_DECLARE(cavium_smmuv2, "cavium,smmu-v2", arm_smmu_of_init);
+
MODULE_DESCRIPTION("IOMMU API for ARM architected SMMU implementations");
MODULE_AUTHOR("Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>");
MODULE_LICENSE("GPL v2");
--
2.8.1.dirty
--
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^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 17/20] iommu/arm-smmu: Wire up generic configuration support
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
With everything else now in place, fill in an of_xlate callback and the
appropriate registration to plumb into the generic configuration
machinery, and watch everything just work.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
- Entirely disallow mixing old and new bindings
---
drivers/iommu/arm-smmu.c | 172 ++++++++++++++++++++++++++++++-----------------
1 file changed, 112 insertions(+), 60 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index de09b73caf7f..aaf7d92448a3 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -43,6 +43,7 @@
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_iommu.h>
+#include <linux/of_platform.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@@ -418,6 +419,8 @@ struct arm_smmu_option_prop {
static atomic_t cavium_smmu_context_count = ATOMIC_INIT(0);
+static bool using_legacy_binding, using_generic_binding;
+
static struct arm_smmu_option_prop arm_smmu_options[] = {
{ ARM_SMMU_OPT_SECURE_CFG_ACCESS, "calxeda,smmu-secure-config-access" },
{ 0, NULL},
@@ -815,12 +818,6 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
if (smmu_domain->smmu)
goto out_unlock;
- /* We're bypassing these SIDs, so don't allocate an actual context */
- if (domain->type == IOMMU_DOMAIN_DMA) {
- smmu_domain->smmu = smmu;
- goto out_unlock;
- }
-
/*
* Mapping the requested stage onto what we support is surprisingly
* complicated, mainly because the spec allows S1+S2 SMMUs without
@@ -979,7 +976,7 @@ static void arm_smmu_destroy_domain_context(struct iommu_domain *domain)
void __iomem *cb_base;
int irq;
- if (!smmu || domain->type == IOMMU_DOMAIN_DMA)
+ if (!smmu)
return;
/*
@@ -1013,8 +1010,8 @@ static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
if (!smmu_domain)
return NULL;
- if (type == IOMMU_DOMAIN_DMA &&
- iommu_get_dma_cookie(&smmu_domain->domain)) {
+ if (type == IOMMU_DOMAIN_DMA && (using_legacy_binding ||
+ iommu_get_dma_cookie(&smmu_domain->domain))) {
kfree(smmu_domain);
return NULL;
}
@@ -1131,19 +1128,22 @@ static int arm_smmu_master_alloc_smes(struct device *dev)
mutex_lock(&smmu->stream_map_mutex);
/* Figure out a viable stream map entry allocation */
for_each_cfg_sme(fwspec, i, idx) {
+ u16 sid = fwspec->ids[i];
+ u16 mask = fwspec->ids[i] >> SMR_MASK_SHIFT;
+
if (idx != INVALID_SMENDX) {
ret = -EEXIST;
goto out_err;
}
- ret = arm_smmu_find_sme(smmu, fwspec->ids[i], 0);
+ ret = arm_smmu_find_sme(smmu, sid, mask);
if (ret < 0)
goto out_err;
idx = ret;
if (smrs && smmu->s2crs[idx].count == 0) {
- smrs[idx].id = fwspec->ids[i];
- smrs[idx].mask = 0; /* We don't currently share SMRs */
+ smrs[idx].id = sid;
+ smrs[idx].mask = mask;
smrs[idx].valid = true;
}
smmu->s2crs[idx].count++;
@@ -1201,15 +1201,6 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
u8 cbndx = smmu_domain->cfg.cbndx;
int i, idx;
- /*
- * FIXME: This won't be needed once we have IOMMU-backed DMA ops
- * for all devices behind the SMMU. Note that we need to take
- * care configuring SMRs for devices both a platform_device and
- * and a PCI device (i.e. a PCI host controller)
- */
- if (smmu_domain->domain.type == IOMMU_DOMAIN_DMA)
- type = S2CR_TYPE_BYPASS;
-
for_each_cfg_sme(fwspec, i, idx) {
if (type == s2cr[idx].type && cbndx == s2cr[idx].cbndx)
continue;
@@ -1373,25 +1364,50 @@ static bool arm_smmu_capable(enum iommu_cap cap)
}
}
+static int arm_smmu_match_node(struct device *dev, void *data)
+{
+ return dev->of_node == data;
+}
+
+static struct arm_smmu_device *arm_smmu_get_by_node(struct device_node *np)
+{
+ struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
+ np, arm_smmu_match_node);
+ put_device(dev);
+ return dev ? dev_get_drvdata(dev) : NULL;
+}
+
static int arm_smmu_add_device(struct device *dev)
{
struct arm_smmu_device *smmu;
struct arm_smmu_master_cfg *cfg;
- struct iommu_fwspec *fwspec;
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec(dev);
int i, ret;
- ret = arm_smmu_register_legacy_master(dev, &smmu);
- fwspec = dev_iommu_fwspec(dev);
- if (ret)
- goto out_free;
+ if (using_legacy_binding) {
+ ret = arm_smmu_register_legacy_master(dev, &smmu);
+ fwspec = dev_iommu_fwspec(dev);
+ if (ret)
+ goto out_free;
+ } else if (fwspec) {
+ smmu = arm_smmu_get_by_node(fwspec->iommu_np);
+ } else {
+ return -ENODEV;
+ }
ret = -EINVAL;
for (i = 0; i < fwspec->num_ids; i++) {
u16 sid = fwspec->ids[i];
+ u16 mask = fwspec->ids[i] >> SMR_MASK_SHIFT;
if (sid & ~smmu->streamid_mask) {
dev_err(dev, "stream ID 0x%x out of range for SMMU (0x%x)\n",
- sid, cfg->smmu->streamid_mask);
+ sid, smmu->streamid_mask);
+ goto out_free;
+ }
+ if (mask & ~smmu->smr_mask_mask) {
+ dev_err(dev, "SMR mask 0x%x out of range for SMMU (0x%x)\n",
+ sid, smmu->smr_mask_mask);
goto out_free;
}
}
@@ -1503,6 +1519,23 @@ out_unlock:
return ret;
}
+static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
+{
+ u32 fwid = 0;
+ int ret = iommu_fwspec_init(dev, args->np);
+
+ if (ret)
+ return ret;
+
+ if (args->args_count > 0)
+ fwid |= (u16)args->args[0];
+
+ if (args->args_count > 1)
+ fwid |= (u16)args->args[1] << SMR_MASK_SHIFT;
+
+ return iommu_fwspec_add_ids(dev, &fwid, 1);
+}
+
static struct iommu_ops arm_smmu_ops = {
.capable = arm_smmu_capable,
.domain_alloc = arm_smmu_domain_alloc,
@@ -1517,6 +1550,7 @@ static struct iommu_ops arm_smmu_ops = {
.device_group = arm_smmu_device_group,
.domain_get_attr = arm_smmu_domain_get_attr,
.domain_set_attr = arm_smmu_domain_set_attr,
+ .of_xlate = arm_smmu_of_xlate,
.pgsize_bitmap = -1UL, /* Restricted during device attach */
};
@@ -1870,6 +1904,18 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
struct arm_smmu_device *smmu;
struct device *dev = &pdev->dev;
int num_irqs, i, err;
+ bool legacy_binding;
+
+ legacy_binding = of_find_property(dev->of_node, "mmu-masters", NULL);
+ if (legacy_binding && !using_generic_binding) {
+ pr_notice("deprecated \"mmu-masters\" DT property in use; DMA API support unavailable\n");
+ using_legacy_binding = true;
+ } else if (!legacy_binding && !using_legacy_binding) {
+ using_generic_binding = true;
+ } else {
+ dev_err(dev, "not probing due to mismatched DT properties\n");
+ return -ENODEV;
+ }
smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL);
if (!smmu) {
@@ -1954,6 +2000,20 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
of_iommu_set_ops(dev->of_node, &arm_smmu_ops);
platform_set_drvdata(pdev, smmu);
arm_smmu_device_reset(smmu);
+
+ /* Oh, for a proper bus abstraction */
+ if (!iommu_present(&platform_bus_type))
+ bus_set_iommu(&platform_bus_type, &arm_smmu_ops);
+#ifdef CONFIG_ARM_AMBA
+ if (!iommu_present(&amba_bustype))
+ bus_set_iommu(&amba_bustype, &arm_smmu_ops);
+#endif
+#ifdef CONFIG_PCI
+ if (!iommu_present(&pci_bus_type)) {
+ pci_request_acs();
+ bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
+ }
+#endif
return 0;
}
@@ -1983,41 +2043,14 @@ static struct platform_driver arm_smmu_driver = {
static int __init arm_smmu_init(void)
{
- struct device_node *np;
- int ret;
+ static bool registered;
+ int ret = 0;
- /*
- * Play nice with systems that don't have an ARM SMMU by checking that
- * an ARM SMMU exists in the system before proceeding with the driver
- * and IOMMU bus operation registration.
- */
- np = of_find_matching_node(NULL, arm_smmu_of_match);
- if (!np)
- return 0;
-
- of_node_put(np);
-
- ret = platform_driver_register(&arm_smmu_driver);
- if (ret)
- return ret;
-
- /* Oh, for a proper bus abstraction */
- if (!iommu_present(&platform_bus_type))
- bus_set_iommu(&platform_bus_type, &arm_smmu_ops);
-
-#ifdef CONFIG_ARM_AMBA
- if (!iommu_present(&amba_bustype))
- bus_set_iommu(&amba_bustype, &arm_smmu_ops);
-#endif
-
-#ifdef CONFIG_PCI
- if (!iommu_present(&pci_bus_type)) {
- pci_request_acs();
- bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
+ if (!registered) {
+ ret = platform_driver_register(&arm_smmu_driver);
+ registered = !ret;
}
-#endif
-
- return 0;
+ return ret;
}
static void __exit arm_smmu_exit(void)
@@ -2028,6 +2061,25 @@ static void __exit arm_smmu_exit(void)
subsys_initcall(arm_smmu_init);
module_exit(arm_smmu_exit);
+static int __init arm_smmu_of_init(struct device_node *np)
+{
+ int ret = arm_smmu_init();
+
+ if (ret)
+ return ret;
+
+ if (!of_platform_device_create(np, NULL, platform_bus_type.dev_root))
+ return -ENODEV;
+
+ return 0;
+}
+IOMMU_OF_DECLARE(arm_smmuv1, "arm,smmu-v1", arm_smmu_of_init);
+IOMMU_OF_DECLARE(arm_smmuv2, "arm,smmu-v2", arm_smmu_of_init);
+IOMMU_OF_DECLARE(arm_mmu400, "arm,mmu-400", arm_smmu_of_init);
+IOMMU_OF_DECLARE(arm_mmu401, "arm,mmu-401", arm_smmu_of_init);
+IOMMU_OF_DECLARE(arm_mmu500, "arm,mmu-500", arm_smmu_of_init);
+IOMMU_OF_DECLARE(cavium_smmuv2, "cavium,smmu-v2", arm_smmu_of_init);
+
MODULE_DESCRIPTION("IOMMU API for ARM architected SMMU implementations");
MODULE_AUTHOR("Will Deacon <will.deacon@arm.com>");
MODULE_LICENSE("GPL v2");
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 18/20] iommu/arm-smmu: Set domain geometry
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
For non-aperture-based IOMMUs, the domain geometry seems to have become
the de-facto way of indicating the input address space size. That is
quite a useful thing from the users' perspective, so let's do the same.
Reviewed-by: Eric Auger <eric.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
drivers/iommu/arm-smmu-v3.c | 2 ++
drivers/iommu/arm-smmu.c | 2 ++
2 files changed, 4 insertions(+)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 1f350a50b35d..be293b5aa896 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1546,6 +1546,8 @@ static int arm_smmu_domain_finalise(struct iommu_domain *domain)
return -ENOMEM;
domain->pgsize_bitmap = pgtbl_cfg.pgsize_bitmap;
+ domain->geometry.aperture_end = (1UL << ias) - 1;
+ domain->geometry.force_aperture = true;
smmu_domain->pgtbl_ops = pgtbl_ops;
ret = finalise_stage_fn(smmu_domain, &pgtbl_cfg);
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index aaf7d92448a3..2e20cdc362e0 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -938,6 +938,8 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
/* Update the domain's page sizes to reflect the page table format */
domain->pgsize_bitmap = pgtbl_cfg.pgsize_bitmap;
+ domain->geometry.aperture_end = (1UL << ias) - 1;
+ domain->geometry.force_aperture = true;
/* Initialise the context bank with our page table cfg */
arm_smmu_init_context_bank(smmu_domain, &pgtbl_cfg);
--
2.8.1.dirty
--
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^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 18/20] iommu/arm-smmu: Set domain geometry
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
For non-aperture-based IOMMUs, the domain geometry seems to have become
the de-facto way of indicating the input address space size. That is
quite a useful thing from the users' perspective, so let's do the same.
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/iommu/arm-smmu-v3.c | 2 ++
drivers/iommu/arm-smmu.c | 2 ++
2 files changed, 4 insertions(+)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 1f350a50b35d..be293b5aa896 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1546,6 +1546,8 @@ static int arm_smmu_domain_finalise(struct iommu_domain *domain)
return -ENOMEM;
domain->pgsize_bitmap = pgtbl_cfg.pgsize_bitmap;
+ domain->geometry.aperture_end = (1UL << ias) - 1;
+ domain->geometry.force_aperture = true;
smmu_domain->pgtbl_ops = pgtbl_ops;
ret = finalise_stage_fn(smmu_domain, &pgtbl_cfg);
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index aaf7d92448a3..2e20cdc362e0 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -938,6 +938,8 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
/* Update the domain's page sizes to reflect the page table format */
domain->pgsize_bitmap = pgtbl_cfg.pgsize_bitmap;
+ domain->geometry.aperture_end = (1UL << ias) - 1;
+ domain->geometry.force_aperture = true;
/* Initialise the context bank with our page table cfg */
arm_smmu_init_context_bank(smmu_domain, &pgtbl_cfg);
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH v6 20/20] iommu/dma: Avoid PCI host bridge windows
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-06 15:33 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: joro-zLv9SwRftAIdnm+yROfE0A, will.deacon-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
With our DMA ops enabled for PCI devices, we should avoid allocating
IOVAs which a host bridge might misinterpret as peer-to-peer DMA and
lead to faults, corruption or other badness. To be safe, punch out holes
for all of the relevant host bridge's windows when initialising a DMA
domain for a PCI device.
Reported-by: Lorenzo Pieralisi <lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
- New
---
arch/arm64/mm/dma-mapping.c | 2 +-
drivers/iommu/dma-iommu.c | 25 ++++++++++++++++++++++++-
include/linux/dma-iommu.h | 3 ++-
3 files changed, 27 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index c4284c432ae8..610d8e53011e 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -827,7 +827,7 @@ static bool do_iommu_attach(struct device *dev, const struct iommu_ops *ops,
* then the IOMMU core will have already configured a group for this
* device, and allocated the default domain for that group.
*/
- if (!domain || iommu_dma_init_domain(domain, dma_base, size)) {
+ if (!domain || iommu_dma_init_domain(domain, dma_base, size, dev)) {
pr_warn("Failed to set up IOMMU for device %s; retaining platform DMA ops\n",
dev_name(dev));
return false;
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 90f9c6b7d472..424c04112398 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -27,6 +27,7 @@
#include <linux/iova.h>
#include <linux/irq.h>
#include <linux/mm.h>
+#include <linux/pci.h>
#include <linux/scatterlist.h>
#include <linux/vmalloc.h>
@@ -103,18 +104,38 @@ void iommu_put_dma_cookie(struct iommu_domain *domain)
}
EXPORT_SYMBOL(iommu_put_dma_cookie);
+static void iova_reserve_pci_windows(struct pci_dev *dev,
+ struct iova_domain *iovad)
+{
+ struct pci_host_bridge *bridge = pci_find_host_bridge(dev->bus);
+ struct resource_entry *window;
+ unsigned long lo, hi;
+
+ resource_list_for_each_entry(window, &bridge->windows) {
+ if (resource_type(window->res) != IORESOURCE_MEM &&
+ resource_type(window->res) != IORESOURCE_IO)
+ continue;
+
+ lo = iova_pfn(iovad, window->res->start - window->offset);
+ hi = iova_pfn(iovad, window->res->end - window->offset);
+ reserve_iova(iovad, lo, hi);
+ }
+}
+
/**
* iommu_dma_init_domain - Initialise a DMA mapping domain
* @domain: IOMMU domain previously prepared by iommu_get_dma_cookie()
* @base: IOVA at which the mappable address space starts
* @size: Size of IOVA space
+ * @dev: Device the domain is being initialised for
*
* @base and @size should be exact multiples of IOMMU page granularity to
* avoid rounding surprises. If necessary, we reserve the page at address 0
* to ensure it is an invalid IOVA. It is safe to reinitialise a domain, but
* any change which could make prior IOVAs invalid will fail.
*/
-int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, u64 size)
+int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
+ u64 size, struct device *dev)
{
struct iova_domain *iovad = cookie_iovad(domain);
unsigned long order, base_pfn, end_pfn;
@@ -152,6 +173,8 @@ int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, u64 size
iovad->dma_32bit_pfn = end_pfn;
} else {
init_iova_domain(iovad, 1UL << order, base_pfn, end_pfn);
+ if (dev && dev_is_pci(dev))
+ iova_reserve_pci_windows(to_pci_dev(dev), iovad);
}
return 0;
}
diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
index 5ee806e41b5c..32c589062bd9 100644
--- a/include/linux/dma-iommu.h
+++ b/include/linux/dma-iommu.h
@@ -30,7 +30,8 @@ int iommu_get_dma_cookie(struct iommu_domain *domain);
void iommu_put_dma_cookie(struct iommu_domain *domain);
/* Setup call for arch DMA mapping code */
-int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, u64 size);
+int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
+ u64 size, struct device *dev);
/* General helpers for DMA-API <-> IOMMU-API interaction */
int dma_direction_to_prot(enum dma_data_direction dir, bool coherent);
--
2.8.1.dirty
--
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^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH v6 20/20] iommu/dma: Avoid PCI host bridge windows
@ 2016-09-06 15:33 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-06 15:33 UTC (permalink / raw)
To: linux-arm-kernel
With our DMA ops enabled for PCI devices, we should avoid allocating
IOVAs which a host bridge might misinterpret as peer-to-peer DMA and
lead to faults, corruption or other badness. To be safe, punch out holes
for all of the relevant host bridge's windows when initialising a DMA
domain for a PCI device.
Reported-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
- New
---
arch/arm64/mm/dma-mapping.c | 2 +-
drivers/iommu/dma-iommu.c | 25 ++++++++++++++++++++++++-
include/linux/dma-iommu.h | 3 ++-
3 files changed, 27 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index c4284c432ae8..610d8e53011e 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -827,7 +827,7 @@ static bool do_iommu_attach(struct device *dev, const struct iommu_ops *ops,
* then the IOMMU core will have already configured a group for this
* device, and allocated the default domain for that group.
*/
- if (!domain || iommu_dma_init_domain(domain, dma_base, size)) {
+ if (!domain || iommu_dma_init_domain(domain, dma_base, size, dev)) {
pr_warn("Failed to set up IOMMU for device %s; retaining platform DMA ops\n",
dev_name(dev));
return false;
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 90f9c6b7d472..424c04112398 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -27,6 +27,7 @@
#include <linux/iova.h>
#include <linux/irq.h>
#include <linux/mm.h>
+#include <linux/pci.h>
#include <linux/scatterlist.h>
#include <linux/vmalloc.h>
@@ -103,18 +104,38 @@ void iommu_put_dma_cookie(struct iommu_domain *domain)
}
EXPORT_SYMBOL(iommu_put_dma_cookie);
+static void iova_reserve_pci_windows(struct pci_dev *dev,
+ struct iova_domain *iovad)
+{
+ struct pci_host_bridge *bridge = pci_find_host_bridge(dev->bus);
+ struct resource_entry *window;
+ unsigned long lo, hi;
+
+ resource_list_for_each_entry(window, &bridge->windows) {
+ if (resource_type(window->res) != IORESOURCE_MEM &&
+ resource_type(window->res) != IORESOURCE_IO)
+ continue;
+
+ lo = iova_pfn(iovad, window->res->start - window->offset);
+ hi = iova_pfn(iovad, window->res->end - window->offset);
+ reserve_iova(iovad, lo, hi);
+ }
+}
+
/**
* iommu_dma_init_domain - Initialise a DMA mapping domain
* @domain: IOMMU domain previously prepared by iommu_get_dma_cookie()
* @base: IOVA at which the mappable address space starts
* @size: Size of IOVA space
+ * @dev: Device the domain is being initialised for
*
* @base and @size should be exact multiples of IOMMU page granularity to
* avoid rounding surprises. If necessary, we reserve the page at address 0
* to ensure it is an invalid IOVA. It is safe to reinitialise a domain, but
* any change which could make prior IOVAs invalid will fail.
*/
-int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, u64 size)
+int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
+ u64 size, struct device *dev)
{
struct iova_domain *iovad = cookie_iovad(domain);
unsigned long order, base_pfn, end_pfn;
@@ -152,6 +173,8 @@ int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, u64 size
iovad->dma_32bit_pfn = end_pfn;
} else {
init_iova_domain(iovad, 1UL << order, base_pfn, end_pfn);
+ if (dev && dev_is_pci(dev))
+ iova_reserve_pci_windows(to_pci_dev(dev), iovad);
}
return 0;
}
diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
index 5ee806e41b5c..32c589062bd9 100644
--- a/include/linux/dma-iommu.h
+++ b/include/linux/dma-iommu.h
@@ -30,7 +30,8 @@ int iommu_get_dma_cookie(struct iommu_domain *domain);
void iommu_put_dma_cookie(struct iommu_domain *domain);
/* Setup call for arch DMA mapping code */
-int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, u64 size);
+int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
+ u64 size, struct device *dev);
/* General helpers for DMA-API <-> IOMMU-API interaction */
int dma_direction_to_prot(enum dma_data_direction dir, bool coherent);
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* Re: [PATCH v6 00/20] Generic DT bindings for PCI IOMMUs and ARM SMMU
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-09 17:37 ` Will Deacon
-1 siblings, 0 replies; 66+ messages in thread
From: Will Deacon @ 2016-09-09 17:37 UTC (permalink / raw)
To: Robin Murphy
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, punit.agrawal-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Hi Robin,
On Tue, Sep 06, 2016 at 04:33:33PM +0100, Robin Murphy wrote:
> Here's v6 to address last week's comments. For the sake of honesty I've
> left Lorenzo's tested-by off everything I've changed since, and Eric's
> reviewed-by off patch 19 having non-trivially reworked the guts of it.
>
> Patch 20 is new, but as it's currently a solution waiting for a problem
> as far as we're aware, oughtn't to get in the way; hopefully the rest is
> in good shape for 4.9 now.
>
> Branch here, based on Will's iommu/devel queue:
>
> git://linux-arm.org/linux-rm iommu/generic-v6
I'm pretty happy with this (modulo the binding docs update etc we
discussed off list), however I'm seeing an allmodconfig build failure
with this applied. Error below.
Please can you take a look and send a fixup patch?
Cheers,
Will
--->8
In file included from drivers/gpu/drm/exynos/exynos_drm_drv.c:33:0:
drivers/gpu/drm/exynos/exynos_drm_iommu.h: In function ‘__exynos_iommu_create_mapping’:
drivers/gpu/drm/exynos/exynos_drm_iommu.h:69:8: error: too few arguments to function ‘iommu_dma_init_domain’
ret = iommu_dma_init_domain(domain, start, size);
^
In file included from drivers/gpu/drm/exynos/exynos_drm_iommu.h:53:0,
from drivers/gpu/drm/exynos/exynos_drm_drv.c:33:
./include/linux/dma-iommu.h:33:5: note: declared here
int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
^
make[4]: *** [drivers/gpu/drm/exynos/exynos_drm_drv.o] Error 1
make[3]: *** [drivers/gpu/drm/exynos] Error 2
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [drivers/gpu/drm] Error 2
make[1]: *** [drivers/gpu] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [drivers] Error 2
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
^ permalink raw reply [flat|nested] 66+ messages in thread* [PATCH v6 00/20] Generic DT bindings for PCI IOMMUs and ARM SMMU
@ 2016-09-09 17:37 ` Will Deacon
0 siblings, 0 replies; 66+ messages in thread
From: Will Deacon @ 2016-09-09 17:37 UTC (permalink / raw)
To: linux-arm-kernel
Hi Robin,
On Tue, Sep 06, 2016 at 04:33:33PM +0100, Robin Murphy wrote:
> Here's v6 to address last week's comments. For the sake of honesty I've
> left Lorenzo's tested-by off everything I've changed since, and Eric's
> reviewed-by off patch 19 having non-trivially reworked the guts of it.
>
> Patch 20 is new, but as it's currently a solution waiting for a problem
> as far as we're aware, oughtn't to get in the way; hopefully the rest is
> in good shape for 4.9 now.
>
> Branch here, based on Will's iommu/devel queue:
>
> git://linux-arm.org/linux-rm iommu/generic-v6
I'm pretty happy with this (modulo the binding docs update etc we
discussed off list), however I'm seeing an allmodconfig build failure
with this applied. Error below.
Please can you take a look and send a fixup patch?
Cheers,
Will
--->8
In file included from drivers/gpu/drm/exynos/exynos_drm_drv.c:33:0:
drivers/gpu/drm/exynos/exynos_drm_iommu.h: In function ?__exynos_iommu_create_mapping?:
drivers/gpu/drm/exynos/exynos_drm_iommu.h:69:8: error: too few arguments to function ?iommu_dma_init_domain?
ret = iommu_dma_init_domain(domain, start, size);
^
In file included from drivers/gpu/drm/exynos/exynos_drm_iommu.h:53:0,
from drivers/gpu/drm/exynos/exynos_drm_drv.c:33:
./include/linux/dma-iommu.h:33:5: note: declared here
int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
^
make[4]: *** [drivers/gpu/drm/exynos/exynos_drm_drv.o] Error 1
make[3]: *** [drivers/gpu/drm/exynos] Error 2
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [drivers/gpu/drm] Error 2
make[1]: *** [drivers/gpu] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [drivers] Error 2
^ permalink raw reply [flat|nested] 66+ messages in thread
* [PATCH 21/20] drm/exynos: Fix iommu_dma_init_domain prototype change
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-09 18:17 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-09 18:17 UTC (permalink / raw)
To: will.deacon-5wv7dgnIgG8, joro-zLv9SwRftAIdnm+yROfE0A,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, David Airlie,
punit.agrawal-5wv7dgnIgG8,
dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW, Inki Dae,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA
When adding an extra argument to a function, one really should try a bit
harder to catch *all* the callers...
CC: Marek Szyprowski <m.szyprowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
CC: Inki Dae <inki.dae-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
CC: David Airlie <airlied-cv59FeDIM0c@public.gmane.org>
CC: dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
Ideally, this should be squashed into "iommu/dma: Avoid PCI host bridge
windows" to avoid potential bisection breakage. Sorry!
drivers/gpu/drm/exynos/exynos_drm_iommu.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_iommu.h b/drivers/gpu/drm/exynos/exynos_drm_iommu.h
index c8de4913fdbe..87f6b5672e11 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_iommu.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_iommu.h
@@ -66,7 +66,7 @@ static inline int __exynos_iommu_create_mapping(struct exynos_drm_private *priv,
if (ret)
goto free_domain;
- ret = iommu_dma_init_domain(domain, start, size);
+ ret = iommu_dma_init_domain(domain, start, size, NULL);
if (ret)
goto put_cookie;
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
* [PATCH 21/20] drm/exynos: Fix iommu_dma_init_domain prototype change
@ 2016-09-09 18:17 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-09 18:17 UTC (permalink / raw)
To: linux-arm-kernel
When adding an extra argument to a function, one really should try a bit
harder to catch *all* the callers...
CC: Marek Szyprowski <m.szyprowski@samsung.com>
CC: Inki Dae <inki.dae@samsung.com>
CC: David Airlie <airlied@linux.ie>
CC: dri-devel at lists.freedesktop.org
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
Ideally, this should be squashed into "iommu/dma: Avoid PCI host bridge
windows" to avoid potential bisection breakage. Sorry!
drivers/gpu/drm/exynos/exynos_drm_iommu.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_iommu.h b/drivers/gpu/drm/exynos/exynos_drm_iommu.h
index c8de4913fdbe..87f6b5672e11 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_iommu.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_iommu.h
@@ -66,7 +66,7 @@ static inline int __exynos_iommu_create_mapping(struct exynos_drm_private *priv,
if (ret)
goto free_domain;
- ret = iommu_dma_init_domain(domain, start, size);
+ ret = iommu_dma_init_domain(domain, start, size, NULL);
if (ret)
goto put_cookie;
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread
[parent not found: <47cdafe035630f29aa1e8ff121c5a5306a2f1eb2.1473444220.git.robin.murphy-5wv7dgnIgG8@public.gmane.org>]
* Re: [PATCH 21/20] drm/exynos: Fix iommu_dma_init_domain prototype change
2016-09-09 18:17 ` Robin Murphy
@ 2016-09-12 9:18 ` Will Deacon
-1 siblings, 0 replies; 66+ messages in thread
From: Will Deacon @ 2016-09-12 9:18 UTC (permalink / raw)
To: Robin Murphy
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, punit.agrawal-5wv7dgnIgG8,
dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW, Inki Dae,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA, David Airlie,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
On Fri, Sep 09, 2016 at 07:17:46PM +0100, Robin Murphy wrote:
> When adding an extra argument to a function, one really should try a bit
> harder to catch *all* the callers...
>
> CC: Marek Szyprowski <m.szyprowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
> CC: Inki Dae <inki.dae-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
> CC: David Airlie <airlied-cv59FeDIM0c@public.gmane.org>
> CC: dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
> Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
>
> ---
>
> Ideally, this should be squashed into "iommu/dma: Avoid PCI host bridge
> windows" to avoid potential bisection breakage. Sorry!
I'll squash this in when I push out the final series..
Will
^ permalink raw reply [flat|nested] 66+ messages in thread
* [PATCH 21/20] drm/exynos: Fix iommu_dma_init_domain prototype change
@ 2016-09-12 9:18 ` Will Deacon
0 siblings, 0 replies; 66+ messages in thread
From: Will Deacon @ 2016-09-12 9:18 UTC (permalink / raw)
To: linux-arm-kernel
On Fri, Sep 09, 2016 at 07:17:46PM +0100, Robin Murphy wrote:
> When adding an extra argument to a function, one really should try a bit
> harder to catch *all* the callers...
>
> CC: Marek Szyprowski <m.szyprowski@samsung.com>
> CC: Inki Dae <inki.dae@samsung.com>
> CC: David Airlie <airlied@linux.ie>
> CC: dri-devel at lists.freedesktop.org
> Signed-off-by: Robin Murphy <robin.murphy@arm.com>
>
> ---
>
> Ideally, this should be squashed into "iommu/dma: Avoid PCI host bridge
> windows" to avoid potential bisection breakage. Sorry!
I'll squash this in when I push out the final series..
Will
^ permalink raw reply [flat|nested] 66+ messages in thread
* [PATCH 22/20] iommu/arm-smmu: Fall back to global bypass
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-09 18:17 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-09 18:17 UTC (permalink / raw)
To: will.deacon-5wv7dgnIgG8, joro-zLv9SwRftAIdnm+yROfE0A,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA
Unlike SMMUv2, SMMUv3 has no easy way to bypass unknown stream IDs,
other than allocating and filling in the entire stream table with bypass
entries, which for some configurations would waste *gigabytes* of RAM.
Otherwise, all transactions on unknown stream IDs will simply be aborted
with a C_BAD_STREAMID event.
Rather than render the system unusable in the case of an invalid DT,
avoid enabling the SMMU altogether such that everything bypasses
(though letting the explicit disable_bypass option take precedence).
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
drivers/iommu/arm-smmu-v3.c | 28 +++++++++++++++++++++++-----
1 file changed, 23 insertions(+), 5 deletions(-)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index be293b5aa896..859b80c83946 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -126,6 +126,9 @@
#define CR2_RECINVSID (1 << 1)
#define CR2_E2H (1 << 0)
+#define ARM_SMMU_GBPA 0x44
+#define GBPA_ABORT (1 << 20)
+
#define ARM_SMMU_IRQ_CTRL 0x50
#define IRQ_CTRL_EVTQ_IRQEN (1 << 2)
#define IRQ_CTRL_PRIQ_IRQEN (1 << 1)
@@ -2242,7 +2245,7 @@ static int arm_smmu_device_disable(struct arm_smmu_device *smmu)
return ret;
}
-static int arm_smmu_device_reset(struct arm_smmu_device *smmu)
+static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass)
{
int ret;
u32 reg, enables;
@@ -2343,8 +2346,14 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu)
return ret;
}
- /* Enable the SMMU interface */
- enables |= CR0_SMMUEN;
+
+ /* Enable the SMMU interface, or ensure bypass */
+ if (!bypass || disable_bypass) {
+ enables |= CR0_SMMUEN;
+ } else {
+ reg = readl_relaxed(smmu->base + ARM_SMMU_GBPA);
+ writel_relaxed(reg & ~GBPA_ABORT, smmu->base + ARM_SMMU_GBPA);
+ }
ret = arm_smmu_write_reg_sync(smmu, enables, ARM_SMMU_CR0,
ARM_SMMU_CR0ACK);
if (ret) {
@@ -2543,6 +2552,15 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
struct resource *res;
struct arm_smmu_device *smmu;
struct device *dev = &pdev->dev;
+ bool bypass = true;
+ u32 cells;
+
+ if (of_property_read_u32(dev->of_node, "#iommu-cells", &cells))
+ dev_err(dev, "missing #iommu-cells property\n");
+ else if (cells != 1)
+ dev_err(dev, "invalid #iommu-cells value (%d)\n", cells);
+ else
+ bypass = false;
smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL);
if (!smmu) {
@@ -2595,8 +2613,8 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, smmu);
/* Reset the device */
- ret = arm_smmu_device_reset(smmu);
- if (ret)
+ ret = arm_smmu_device_reset(smmu, bypass);
+ if (ret || bypass)
return ret;
/* And we're up. Go go go! */
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH 22/20] iommu/arm-smmu: Fall back to global bypass
@ 2016-09-09 18:17 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-09 18:17 UTC (permalink / raw)
To: linux-arm-kernel
Unlike SMMUv2, SMMUv3 has no easy way to bypass unknown stream IDs,
other than allocating and filling in the entire stream table with bypass
entries, which for some configurations would waste *gigabytes* of RAM.
Otherwise, all transactions on unknown stream IDs will simply be aborted
with a C_BAD_STREAMID event.
Rather than render the system unusable in the case of an invalid DT,
avoid enabling the SMMU altogether such that everything bypasses
(though letting the explicit disable_bypass option take precedence).
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/iommu/arm-smmu-v3.c | 28 +++++++++++++++++++++++-----
1 file changed, 23 insertions(+), 5 deletions(-)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index be293b5aa896..859b80c83946 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -126,6 +126,9 @@
#define CR2_RECINVSID (1 << 1)
#define CR2_E2H (1 << 0)
+#define ARM_SMMU_GBPA 0x44
+#define GBPA_ABORT (1 << 20)
+
#define ARM_SMMU_IRQ_CTRL 0x50
#define IRQ_CTRL_EVTQ_IRQEN (1 << 2)
#define IRQ_CTRL_PRIQ_IRQEN (1 << 1)
@@ -2242,7 +2245,7 @@ static int arm_smmu_device_disable(struct arm_smmu_device *smmu)
return ret;
}
-static int arm_smmu_device_reset(struct arm_smmu_device *smmu)
+static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass)
{
int ret;
u32 reg, enables;
@@ -2343,8 +2346,14 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu)
return ret;
}
- /* Enable the SMMU interface */
- enables |= CR0_SMMUEN;
+
+ /* Enable the SMMU interface, or ensure bypass */
+ if (!bypass || disable_bypass) {
+ enables |= CR0_SMMUEN;
+ } else {
+ reg = readl_relaxed(smmu->base + ARM_SMMU_GBPA);
+ writel_relaxed(reg & ~GBPA_ABORT, smmu->base + ARM_SMMU_GBPA);
+ }
ret = arm_smmu_write_reg_sync(smmu, enables, ARM_SMMU_CR0,
ARM_SMMU_CR0ACK);
if (ret) {
@@ -2543,6 +2552,15 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
struct resource *res;
struct arm_smmu_device *smmu;
struct device *dev = &pdev->dev;
+ bool bypass = true;
+ u32 cells;
+
+ if (of_property_read_u32(dev->of_node, "#iommu-cells", &cells))
+ dev_err(dev, "missing #iommu-cells property\n");
+ else if (cells != 1)
+ dev_err(dev, "invalid #iommu-cells value (%d)\n", cells);
+ else
+ bypass = false;
smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL);
if (!smmu) {
@@ -2595,8 +2613,8 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, smmu);
/* Reset the device */
- ret = arm_smmu_device_reset(smmu);
- if (ret)
+ ret = arm_smmu_device_reset(smmu, bypass);
+ if (ret || bypass)
return ret;
/* And we're up. Go go go! */
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread[parent not found: <9c467662ca0fb562cff6d5c9443d77eacb257060.1473443407.git.robin.murphy-5wv7dgnIgG8@public.gmane.org>]
* Re: [PATCH 22/20] iommu/arm-smmu: Fall back to global bypass
2016-09-09 18:17 ` Robin Murphy
@ 2016-09-12 9:12 ` Will Deacon
-1 siblings, 0 replies; 66+ messages in thread
From: Will Deacon @ 2016-09-12 9:12 UTC (permalink / raw)
To: Robin Murphy
Cc: joro-zLv9SwRftAIdnm+yROfE0A,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
devicetree-u79uwXL29TY76Z2rM5mHXA, lorenzo.pieralisi-5wv7dgnIgG8,
jean-philippe.brucker-5wv7dgnIgG8, punit.agrawal-5wv7dgnIgG8,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
eric.auger-H+wXaHxf7aLQT0dZR+AlfA
On Fri, Sep 09, 2016 at 07:17:47PM +0100, Robin Murphy wrote:
> Unlike SMMUv2, SMMUv3 has no easy way to bypass unknown stream IDs,
> other than allocating and filling in the entire stream table with bypass
> entries, which for some configurations would waste *gigabytes* of RAM.
> Otherwise, all transactions on unknown stream IDs will simply be aborted
> with a C_BAD_STREAMID event.
>
> Rather than render the system unusable in the case of an invalid DT,
> avoid enabling the SMMU altogether such that everything bypasses
> (though letting the explicit disable_bypass option take precedence).
>
> Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
> ---
> drivers/iommu/arm-smmu-v3.c | 28 +++++++++++++++++++++++-----
> 1 file changed, 23 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index be293b5aa896..859b80c83946 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -126,6 +126,9 @@
> #define CR2_RECINVSID (1 << 1)
> #define CR2_E2H (1 << 0)
>
> +#define ARM_SMMU_GBPA 0x44
> +#define GBPA_ABORT (1 << 20)
> +
> #define ARM_SMMU_IRQ_CTRL 0x50
> #define IRQ_CTRL_EVTQ_IRQEN (1 << 2)
> #define IRQ_CTRL_PRIQ_IRQEN (1 << 1)
> @@ -2242,7 +2245,7 @@ static int arm_smmu_device_disable(struct arm_smmu_device *smmu)
> return ret;
> }
>
> -static int arm_smmu_device_reset(struct arm_smmu_device *smmu)
> +static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass)
> {
> int ret;
> u32 reg, enables;
> @@ -2343,8 +2346,14 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu)
> return ret;
> }
>
> - /* Enable the SMMU interface */
> - enables |= CR0_SMMUEN;
> +
> + /* Enable the SMMU interface, or ensure bypass */
> + if (!bypass || disable_bypass) {
> + enables |= CR0_SMMUEN;
> + } else {
> + reg = readl_relaxed(smmu->base + ARM_SMMU_GBPA);
> + writel_relaxed(reg & ~GBPA_ABORT, smmu->base + ARM_SMMU_GBPA);
> + }
I think this invokes the CONSTRAINED UNPREDICTABLE monster, because the
GBPA register has some a special update procedure involving the 'update'
bit (bit 31).
You might be able to reuse arm_smmu_write_reg_sync to poll for completion
with offset 0. I'm happy to assume that the update bit is initially clear.
Will
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^ permalink raw reply [flat|nested] 66+ messages in thread* [PATCH 22/20] iommu/arm-smmu: Fall back to global bypass
@ 2016-09-12 9:12 ` Will Deacon
0 siblings, 0 replies; 66+ messages in thread
From: Will Deacon @ 2016-09-12 9:12 UTC (permalink / raw)
To: linux-arm-kernel
On Fri, Sep 09, 2016 at 07:17:47PM +0100, Robin Murphy wrote:
> Unlike SMMUv2, SMMUv3 has no easy way to bypass unknown stream IDs,
> other than allocating and filling in the entire stream table with bypass
> entries, which for some configurations would waste *gigabytes* of RAM.
> Otherwise, all transactions on unknown stream IDs will simply be aborted
> with a C_BAD_STREAMID event.
>
> Rather than render the system unusable in the case of an invalid DT,
> avoid enabling the SMMU altogether such that everything bypasses
> (though letting the explicit disable_bypass option take precedence).
>
> Signed-off-by: Robin Murphy <robin.murphy@arm.com>
> ---
> drivers/iommu/arm-smmu-v3.c | 28 +++++++++++++++++++++++-----
> 1 file changed, 23 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index be293b5aa896..859b80c83946 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -126,6 +126,9 @@
> #define CR2_RECINVSID (1 << 1)
> #define CR2_E2H (1 << 0)
>
> +#define ARM_SMMU_GBPA 0x44
> +#define GBPA_ABORT (1 << 20)
> +
> #define ARM_SMMU_IRQ_CTRL 0x50
> #define IRQ_CTRL_EVTQ_IRQEN (1 << 2)
> #define IRQ_CTRL_PRIQ_IRQEN (1 << 1)
> @@ -2242,7 +2245,7 @@ static int arm_smmu_device_disable(struct arm_smmu_device *smmu)
> return ret;
> }
>
> -static int arm_smmu_device_reset(struct arm_smmu_device *smmu)
> +static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass)
> {
> int ret;
> u32 reg, enables;
> @@ -2343,8 +2346,14 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu)
> return ret;
> }
>
> - /* Enable the SMMU interface */
> - enables |= CR0_SMMUEN;
> +
> + /* Enable the SMMU interface, or ensure bypass */
> + if (!bypass || disable_bypass) {
> + enables |= CR0_SMMUEN;
> + } else {
> + reg = readl_relaxed(smmu->base + ARM_SMMU_GBPA);
> + writel_relaxed(reg & ~GBPA_ABORT, smmu->base + ARM_SMMU_GBPA);
> + }
I think this invokes the CONSTRAINED UNPREDICTABLE monster, because the
GBPA register has some a special update procedure involving the 'update'
bit (bit 31).
You might be able to reuse arm_smmu_write_reg_sync to poll for completion
with offset 0. I'm happy to assume that the update bit is initially clear.
Will
^ permalink raw reply [flat|nested] 66+ messages in thread
* [PATCH 4.5/20] Docs: dt: document ARM SMMUv3 generic binding usage
2016-09-06 15:33 ` Robin Murphy
@ 2016-09-09 18:17 ` Robin Murphy
-1 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-09 18:17 UTC (permalink / raw)
To: will.deacon-5wv7dgnIgG8, joro-zLv9SwRftAIdnm+yROfE0A,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
Cc: Mark Rutland, devicetree-u79uwXL29TY76Z2rM5mHXA,
punit.agrawal-5wv7dgnIgG8, Rob Herring,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA
Now that we've ratified SMMUv3's use of the generic binding, document it.
CC: Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
CC: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>
Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
---
Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
index 7b94c88cf2ee..69a694f70bea 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
@@ -27,6 +27,12 @@ the PCIe specification.
* "cmdq-sync" - CMD_SYNC complete
* "gerror" - Global Error activated
+- #iommu-cells : See the generic IOMMU binding described in
+ devicetree/bindings/iommu/iommu.txt
+ for details. For SMMUv3, must be 1, with each cell
+ describing a single stream ID. All possible stream
+ ID which a device may emit must be described.
+
** SMMUv3 optional properties:
- dma-coherent : Present if DMA operations made by the SMMU (page
@@ -54,6 +60,6 @@ the PCIe specification.
<GIC_SPI 79 IRQ_TYPE_EDGE_RISING>;
interrupt-names = "eventq", "priq", "cmdq-sync", "gerror";
dma-coherent;
- #iommu-cells = <0>;
+ #iommu-cells = <1>;
msi-parent = <&its 0xff0000>;
};
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread* [PATCH 4.5/20] Docs: dt: document ARM SMMUv3 generic binding usage
@ 2016-09-09 18:17 ` Robin Murphy
0 siblings, 0 replies; 66+ messages in thread
From: Robin Murphy @ 2016-09-09 18:17 UTC (permalink / raw)
To: linux-arm-kernel
Now that we've ratified SMMUv3's use of the generic binding, document it.
CC: Rob Herring <robh+dt@kernel.org>
CC: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
index 7b94c88cf2ee..69a694f70bea 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
@@ -27,6 +27,12 @@ the PCIe specification.
* "cmdq-sync" - CMD_SYNC complete
* "gerror" - Global Error activated
+- #iommu-cells : See the generic IOMMU binding described in
+ devicetree/bindings/iommu/iommu.txt
+ for details. For SMMUv3, must be 1, with each cell
+ describing a single stream ID. All possible stream
+ ID which a device may emit must be described.
+
** SMMUv3 optional properties:
- dma-coherent : Present if DMA operations made by the SMMU (page
@@ -54,6 +60,6 @@ the PCIe specification.
<GIC_SPI 79 IRQ_TYPE_EDGE_RISING>;
interrupt-names = "eventq", "priq", "cmdq-sync", "gerror";
dma-coherent;
- #iommu-cells = <0>;
+ #iommu-cells = <1>;
msi-parent = <&its 0xff0000>;
};
--
2.8.1.dirty
^ permalink raw reply related [flat|nested] 66+ messages in thread[parent not found: <6067fc2b12b3bc681687753eedd941c8244c22fa.1473443407.git.robin.murphy-5wv7dgnIgG8@public.gmane.org>]
* Re: [PATCH 4.5/20] Docs: dt: document ARM SMMUv3 generic binding usage
2016-09-09 18:17 ` Robin Murphy
@ 2016-09-12 9:16 ` Will Deacon
-1 siblings, 0 replies; 66+ messages in thread
From: Will Deacon @ 2016-09-12 9:16 UTC (permalink / raw)
To: Robin Murphy
Cc: Mark Rutland, devicetree-u79uwXL29TY76Z2rM5mHXA,
punit.agrawal-5wv7dgnIgG8,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA, Rob Herring,
thunder.leizhen-hv44wF8Li93QT0dZR+AlfA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r
On Fri, Sep 09, 2016 at 07:17:48PM +0100, Robin Murphy wrote:
> Now that we've ratified SMMUv3's use of the generic binding, document it.
>
> CC: Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> CC: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>
> Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
> ---
> Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
> index 7b94c88cf2ee..69a694f70bea 100644
> --- a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
> +++ b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
> @@ -27,6 +27,12 @@ the PCIe specification.
> * "cmdq-sync" - CMD_SYNC complete
> * "gerror" - Global Error activated
>
> +- #iommu-cells : See the generic IOMMU binding described in
> + devicetree/bindings/iommu/iommu.txt
That file has a weird "Notes:" section describing the application of
"iommus" to a PCI host bridge. We should probably rip that out, because
it seems to be going directly against the approach we've ended up taking.
In fact, replacing that with a cross reference to
devicetree/bindings/pci/pci-iommu.txt
would make much more sense to me.
> + for details. For SMMUv3, must be 1, with each cell
> + describing a single stream ID. All possible stream
> + ID which a device may emit must be described.
IDs
Will
^ permalink raw reply [flat|nested] 66+ messages in thread
* [PATCH 4.5/20] Docs: dt: document ARM SMMUv3 generic binding usage
@ 2016-09-12 9:16 ` Will Deacon
0 siblings, 0 replies; 66+ messages in thread
From: Will Deacon @ 2016-09-12 9:16 UTC (permalink / raw)
To: linux-arm-kernel
On Fri, Sep 09, 2016 at 07:17:48PM +0100, Robin Murphy wrote:
> Now that we've ratified SMMUv3's use of the generic binding, document it.
>
> CC: Rob Herring <robh+dt@kernel.org>
> CC: Mark Rutland <mark.rutland@arm.com>
> Signed-off-by: Robin Murphy <robin.murphy@arm.com>
> ---
> Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
> index 7b94c88cf2ee..69a694f70bea 100644
> --- a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
> +++ b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt
> @@ -27,6 +27,12 @@ the PCIe specification.
> * "cmdq-sync" - CMD_SYNC complete
> * "gerror" - Global Error activated
>
> +- #iommu-cells : See the generic IOMMU binding described in
> + devicetree/bindings/iommu/iommu.txt
That file has a weird "Notes:" section describing the application of
"iommus" to a PCI host bridge. We should probably rip that out, because
it seems to be going directly against the approach we've ended up taking.
In fact, replacing that with a cross reference to
devicetree/bindings/pci/pci-iommu.txt
would make much more sense to me.
> + for details. For SMMUv3, must be 1, with each cell
> + describing a single stream ID. All possible stream
> + ID which a device may emit must be described.
IDs
Will
^ permalink raw reply [flat|nested] 66+ messages in thread