[PATCH v6 0/4] Generic SMMU Bindings

[PATCH v6 0/4] Generic SMMU Bindings

[Stefano Stabellini]

Hi all,

This series introduces support for the generic SMMU bindings to
xen/drivers/passthrough/arm/smmu.c.

Cheers,

Stefano

Brian Woods (3):
      arm,smmu: switch to using iommu_fwspec functions
      arm,smmu: restructure code in preparation to new bindings support
      arm,smmu: add support for generic DT bindings. Implement add_device and dt_xlate.

Stefano Stabellini (1):
      xen: do not return -EEXIST if iommu_add_dt_device is called twice

 xen/drivers/passthrough/arm/smmu.c    | 141 +++++++++++++++++++++++++---------
 xen/drivers/passthrough/device_tree.c |  30 ++------
 2 files changed, 113 insertions(+), 58 deletions(-)

[PATCH v6 1/4] arm,smmu: switch to using iommu_fwspec functions

[Stefano Stabellini]

From: Brian Woods <brian.woods@xilinx.com>

Modify the smmu driver so that it uses the iommu_fwspec helper
functions.  This means both ARM IOMMU drivers will both use the
iommu_fwspec helper functions, making enabling generic device tree
bindings in the SMMU driver much cleaner.

Signed-off-by: Brian Woods <brian.woods@xilinx.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
Reviewed-by: Rahul Singh <rahul.singh@arm.com>
---
Changes in v5:
- moved iommu_add_dt_device change to a separate patch
---
 xen/drivers/passthrough/arm/smmu.c | 75 ++++++++++++++++++++----------
 1 file changed, 51 insertions(+), 24 deletions(-)

diff --git a/xen/drivers/passthrough/arm/smmu.c b/xen/drivers/passthrough/arm/smmu.c
index 658c40433c..09773702c3 100644
--- a/xen/drivers/passthrough/arm/smmu.c
+++ b/xen/drivers/passthrough/arm/smmu.c
@@ -32,6 +32,9 @@
  *	- 4k and 64k pages, with contiguous pte hints.
  *	- Up to 48-bit addressing (dependent on VA_BITS)
  *	- Context fault reporting
+ *
+ * Changes compared to Linux driver:
+ *	- support for fwspec
  */
 
 
@@ -49,6 +52,7 @@
 #include <asm/atomic.h>
 #include <asm/device.h>
 #include <asm/io.h>
+#include <asm/iommu_fwspec.h>
 #include <asm/platform.h>
 
 /* Xen: The below defines are redefined within the file. Undef it */
@@ -617,13 +621,11 @@ 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
-#define for_each_cfg_sme(cfg, i, idx) \
-	for (i = 0; idx = cfg->smendx[i], i < cfg->num_streamids; ++i)
+#define for_each_cfg_sme(cfg, i, idx, num) \
+	for (i = 0; idx = cfg->smendx[i], i < num; ++i)
 
 struct arm_smmu_master {
 	struct device_node		*of_node;
@@ -713,6 +715,14 @@ static struct arm_smmu_option_prop arm_smmu_options[] = {
 	{ 0, NULL},
 };
 
+static inline struct iommu_fwspec *
+arm_smmu_get_fwspec(struct arm_smmu_master_cfg *cfg)
+{
+	struct arm_smmu_master *master = container_of(cfg,
+			                                      struct arm_smmu_master, cfg);
+	return dev_iommu_fwspec_get(&master->of_node->dev);
+}
+
 static void parse_driver_options(struct arm_smmu_device *smmu)
 {
 	int i = 0;
@@ -806,8 +816,9 @@ static int register_smmu_master(struct arm_smmu_device *smmu,
 				struct device *dev,
 				struct of_phandle_args *masterspec)
 {
-	int i;
+	int i, ret = 0;
 	struct arm_smmu_master *master;
+	struct iommu_fwspec *fwspec;
 
 	master = find_smmu_master(smmu, masterspec->np);
 	if (master) {
@@ -817,24 +828,30 @@ static int register_smmu_master(struct arm_smmu_device *smmu,
 		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->of_node			= masterspec->np;
-	master->cfg.num_streamids	= masterspec->args_count;
+	ret = iommu_fwspec_init(&master->of_node->dev, smmu->dev);
+	if (ret) {
+		kfree(master);
+		return ret;
+	}
+
+	/* adding the ids here */
+	ret = iommu_fwspec_add_ids(&masterspec->np->dev,
+				   masterspec->args,
+				   masterspec->args_count);
+	if (ret)
+		return ret;
+
+	fwspec = dev_iommu_fwspec_get(dev);
 
 	/* Xen: Let Xen know that the device is protected by an SMMU */
 	dt_device_set_protected(masterspec->np);
 
-	for (i = 0; i < master->cfg.num_streamids; ++i) {
+	for (i = 0; i < fwspec->num_ids; ++i) {
 		u16 streamid = masterspec->args[i];
 
 		if (!(smmu->features & ARM_SMMU_FEAT_STREAM_MATCH) &&
@@ -844,7 +861,6 @@ static int register_smmu_master(struct arm_smmu_device *smmu,
 				masterspec->np->name, smmu->num_mapping_groups);
 			return -ERANGE;
 		}
-		master->cfg.streamids[i] = streamid;
 		master->cfg.smendx[i] = INVALID_SMENDX;
 	}
 	return insert_smmu_master(smmu, master);
@@ -1500,22 +1516,23 @@ static int arm_smmu_master_alloc_smes(struct device *dev)
 	struct arm_smmu_device *smmu = cfg->smmu;
 	struct arm_smmu_smr *smrs = smmu->smrs;
 	int i, idx, ret;
+	struct iommu_fwspec *fwspec = arm_smmu_get_fwspec(cfg);
 
 	spin_lock(&smmu->stream_map_lock);
 	/* Figure out a viable stream map entry allocation */
-	for_each_cfg_sme(cfg, i, idx) {
+	for_each_cfg_sme(cfg, i, idx, fwspec->num_ids) {
 		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;
 		}
@@ -1524,7 +1541,7 @@ static int arm_smmu_master_alloc_smes(struct device *dev)
 	}
 
 	/* It worked! Now, poke the actual hardware */
-	for_each_cfg_sme(cfg, i, idx) {
+	for_each_cfg_sme(cfg, i, idx, fwspec->num_ids) {
 		arm_smmu_write_sme(smmu, idx);
 	}
 
@@ -1544,9 +1561,10 @@ static void arm_smmu_master_free_smes(struct arm_smmu_master_cfg *cfg)
 {
     struct arm_smmu_device *smmu = cfg->smmu;
 	int i, idx;
+	struct iommu_fwspec *fwspec = arm_smmu_get_fwspec(cfg);
 
 	spin_lock(&smmu->stream_map_lock);
-	for_each_cfg_sme(cfg, i, idx) {
+	for_each_cfg_sme(cfg, i, idx, fwspec->num_ids) {
 		if (arm_smmu_free_sme(smmu, idx))
 			arm_smmu_write_sme(smmu, idx);
 		cfg->smendx[i] = INVALID_SMENDX;
@@ -1562,8 +1580,9 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
 	enum arm_smmu_s2cr_type type = S2CR_TYPE_TRANS;
 	u8 cbndx = smmu_domain->cfg.cbndx;
 	int i, idx;
+	struct iommu_fwspec *fwspec = arm_smmu_get_fwspec(cfg);
 
-	for_each_cfg_sme(cfg, i, idx) {
+	for_each_cfg_sme(cfg, i, idx, fwspec->num_ids) {
 		if (type == s2cr[idx].type && cbndx == s2cr[idx].cbndx)
 			continue;
 
@@ -1962,6 +1981,7 @@ static int arm_smmu_add_device(struct device *dev)
 	struct arm_smmu_master_cfg *cfg;
 	struct iommu_group *group;
 	void (*releasefn)(void *) = NULL;
+	int ret;
 
 	smmu = find_smmu_for_device(dev);
 	if (!smmu)
@@ -1969,19 +1989,26 @@ static int arm_smmu_add_device(struct device *dev)
 
 	if (dev_is_pci(dev)) {
 		struct pci_dev *pdev = to_pci_dev(dev);
+		struct iommu_fwspec *fwspec;
 
 		cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
 		if (!cfg) {
 			return -ENOMEM;
 		}
 
-		cfg->num_streamids = 1;
+		ret = iommu_fwspec_init(dev, smmu->dev);
+		if (ret) {
+			kfree(cfg);
+			return ret;
+		}
+		fwspec = dev_iommu_fwspec_get(dev);
+
 		/*
 		 * 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,
-				       &cfg->streamids[0]);
+				       &fwspec->ids[0]);
 		releasefn = __arm_smmu_release_pci_iommudata;
 		cfg->smmu = smmu;
 	} else {
-- 
2.17.1

[PATCH v6 2/4] xen: do not return -EEXIST if iommu_add_dt_device is called twice

[Stefano Stabellini]

iommu_add_dt_device() returns -EEXIST if the device was already
registered. At the moment, this can only happen if the device was
already assigned to a domain (either dom0 at boot or via
XEN_DOMCTL_assign_device).

In a follow-up patch, we will convert the SMMU driver to use the FW
spec. When the legacy bindings are used, all the devices will be
registered at probe. Therefore, iommu_add_dt_device() will always
returns -EEXIST.

Currently, one caller (XEN_DOMCTL_assign_device) will check the return
and ignore -EEXIST. All the other will fail because it was technically a
programming error.

However, there is no harm to call iommu_add_dt_device() twice, so we can
simply return 0.

With that in place the caller doesn't need to check -EEXIST anymore, so
remove the check.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
---
Changes in v6:
- improve in-code comment
- improve commit message
- remove stale in-code comment

Changes in v5:
- new patch
---
 xen/drivers/passthrough/device_tree.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/xen/drivers/passthrough/device_tree.c b/xen/drivers/passthrough/device_tree.c
index 999b831d90..9249f21c01 100644
--- a/xen/drivers/passthrough/device_tree.c
+++ b/xen/drivers/passthrough/device_tree.c
@@ -140,8 +140,12 @@ int iommu_add_dt_device(struct dt_device_node *np)
     if ( !ops )
         return -EINVAL;
 
+    /*
+     * The device may already have been registered. As there is no harm in
+     * it just return success early.
+     */
     if ( dev_iommu_fwspec_get(dev) )
-        return -EEXIST;
+        return 0;
 
     /*
      * According to the Documentation/devicetree/bindings/iommu/iommu.txt
@@ -249,12 +253,7 @@ int iommu_do_dt_domctl(struct xen_domctl *domctl, struct domain *d,
             return -EINVAL;
 
         ret = iommu_add_dt_device(dev);
-        /*
-         * Ignore "-EEXIST" error code as it would mean that the device is
-         * already added to the IOMMU (positive result). Such happens after
-         * re-creating guest domain.
-         */
-        if ( ret < 0 && ret != -EEXIST )
+        if ( ret < 0 )
         {
             printk(XENLOG_G_ERR "Failed to add %s to the IOMMU\n",
                    dt_node_full_name(dev));
-- 
2.17.1

[PATCH v6 3/4] arm,smmu: restructure code in preparation to new bindings support

[Stefano Stabellini]

From: Brian Woods <brian.woods@xilinx.com>

Restructure some of the code and add supporting functions for adding
generic device tree (DT) binding support.  This will allow for using
current Linux device trees with just modifying the chosen field to
enable Xen.

Signed-off-by: Brian Woods <brian.woods@xilinx.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
Reviewed-by: Rahul Singh <rahul.singh@arm.com>
Acked-by: Julien Grall <jgrall@amazon.com>
---
 xen/drivers/passthrough/arm/smmu.c | 62 ++++++++++++++++--------------
 1 file changed, 34 insertions(+), 28 deletions(-)

diff --git a/xen/drivers/passthrough/arm/smmu.c b/xen/drivers/passthrough/arm/smmu.c
index 09773702c3..4aa3ecec57 100644
--- a/xen/drivers/passthrough/arm/smmu.c
+++ b/xen/drivers/passthrough/arm/smmu.c
@@ -812,53 +812,36 @@ static int insert_smmu_master(struct arm_smmu_device *smmu,
 	return 0;
 }
 
-static int register_smmu_master(struct arm_smmu_device *smmu,
-				struct device *dev,
-				struct of_phandle_args *masterspec)
+static int arm_smmu_dt_add_device_legacy(struct arm_smmu_device *smmu,
+					 struct device *dev,
+					 struct iommu_fwspec *fwspec)
 {
-	int i, ret = 0;
+	int i;
 	struct arm_smmu_master *master;
-	struct iommu_fwspec *fwspec;
+	struct device_node *dev_node = dev_get_dev_node(dev);
 
-	master = find_smmu_master(smmu, masterspec->np);
+	master = find_smmu_master(smmu, dev_node);
 	if (master) {
 		dev_err(dev,
 			"rejecting multiple registrations for master device %s\n",
-			masterspec->np->name);
+			dev_node->name);
 		return -EBUSY;
 	}
 
 	master = devm_kzalloc(dev, sizeof(*master), GFP_KERNEL);
 	if (!master)
 		return -ENOMEM;
-	master->of_node = masterspec->np;
-
-	ret = iommu_fwspec_init(&master->of_node->dev, smmu->dev);
-	if (ret) {
-		kfree(master);
-		return ret;
-	}
-
-	/* adding the ids here */
-	ret = iommu_fwspec_add_ids(&masterspec->np->dev,
-				   masterspec->args,
-				   masterspec->args_count);
-	if (ret)
-		return ret;
-
-	fwspec = dev_iommu_fwspec_get(dev);
+	master->of_node = dev_node;
 
 	/* Xen: Let Xen know that the device is protected by an SMMU */
-	dt_device_set_protected(masterspec->np);
+	dt_device_set_protected(dev_node);
 
 	for (i = 0; i < fwspec->num_ids; ++i) {
-		u16 streamid = masterspec->args[i];
-
 		if (!(smmu->features & ARM_SMMU_FEAT_STREAM_MATCH) &&
-		     (streamid >= smmu->num_mapping_groups)) {
+		     (fwspec->ids[i] >= 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);
+				dev_node->name, smmu->num_mapping_groups);
 			return -ERANGE;
 		}
 		master->cfg.smendx[i] = INVALID_SMENDX;
@@ -866,6 +849,29 @@ static int register_smmu_master(struct arm_smmu_device *smmu,
 	return insert_smmu_master(smmu, master);
 }
 
+static int register_smmu_master(struct arm_smmu_device *smmu,
+				struct device *dev,
+				struct of_phandle_args *masterspec)
+{
+	int ret = 0;
+	struct iommu_fwspec *fwspec;
+
+	ret = iommu_fwspec_init(&masterspec->np->dev, smmu->dev);
+	if (ret)
+		return ret;
+
+	ret = iommu_fwspec_add_ids(&masterspec->np->dev,
+				   masterspec->args,
+				   masterspec->args_count);
+	if (ret)
+		return ret;
+
+	fwspec = dev_iommu_fwspec_get(&masterspec->np->dev);
+	return arm_smmu_dt_add_device_legacy(smmu,
+					     &masterspec->np->dev,
+					     fwspec);
+}
+
 static struct arm_smmu_device *find_smmu_for_device(struct device *dev)
 {
 	struct arm_smmu_device *smmu;
-- 
2.17.1

[PATCH v6 4/4] arm,smmu: add support for generic DT bindings. Implement add_device and dt_xlate.

[Stefano Stabellini]

From: Brian Woods <brian.woods@xilinx.com>

For the legacy path, arm_smmu_dt_add_device_legacy is called by
register_smmu_master scanning mmu-masters (a fwspec entry is also
created.) For the generic path, arm_smmu_dt_add_device_generic gets
called instead. Then, arm_smmu_dt_add_device_generic calls
arm_smmu_dt_add_device_legacy afterwards, shared with the legacy path.
This way most of the low level implementation is shared between the two
paths.

If both legacy bindings and generic bindings are present in device tree,
the legacy bindings are the ones that are used. That's because
mmu-masters is parsed by
xen/drivers/passthrough/arm/smmu.c:arm_smmu_device_dt_probe which is
called by arm_smmu_dt_init. It happens very early. iommus is parsed by
xen/drivers/passthrough/device_tree.c:iommu_add_dt_device which is
called by xen/arch/arm/domain_build.c:handle_device and happens
afterwards.

arm_smmu_dt_xlate_generic is a verbatim copy from Linux
(drivers/iommu/arm/arm-smmu/arm-smmu.c:arm_smmu_of_xlate, version
v5.10).

A workaround was introduced by cf4af9d6d6c (xen/arm: boot with device
trees with "mmu-masters" and "iommus") because the SMMU driver only
supported the legacy bindings. Remove it now.

Signed-off-by: Brian Woods <brian.woods@xilinx.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
Reviewed-by: Rahul Singh <rahul.singh@arm.com>
Acked-by: Julien Grall <jgrall@amazon.com>
---
Changes in v5:
- add Acked-by
---
 xen/drivers/passthrough/arm/smmu.c    | 40 ++++++++++++++++++++++++++-
 xen/drivers/passthrough/device_tree.c | 17 +-----------
 2 files changed, 40 insertions(+), 17 deletions(-)

diff --git a/xen/drivers/passthrough/arm/smmu.c b/xen/drivers/passthrough/arm/smmu.c
index 4aa3ecec57..c234ad9c7f 100644
--- a/xen/drivers/passthrough/arm/smmu.c
+++ b/xen/drivers/passthrough/arm/smmu.c
@@ -256,6 +256,8 @@ struct iommu_group
 	atomic_t ref;
 };
 
+static struct arm_smmu_device *find_smmu(const struct device *dev);
+
 static struct iommu_group *iommu_group_alloc(void)
 {
 	struct iommu_group *group = xzalloc(struct iommu_group);
@@ -444,6 +446,8 @@ static struct iommu_group *iommu_group_get(struct device *dev)
 #define SMR_VALID			(1U << 31)
 #define SMR_MASK_SHIFT			16
 #define SMR_ID_SHIFT			0
+#define SMR_ID_MASK			0x7fff
+#define SMR_MASK_MASK			0x7fff
 
 #define ARM_SMMU_GR0_S2CR(n)		(0xc00 + ((n) << 2))
 #define S2CR_CBNDX_SHIFT		0
@@ -872,6 +876,38 @@ static int register_smmu_master(struct arm_smmu_device *smmu,
 					     fwspec);
 }
 
+static int arm_smmu_dt_add_device_generic(u8 devfn, struct device *dev)
+{
+	struct arm_smmu_device *smmu;
+	struct iommu_fwspec *fwspec;
+
+	fwspec = dev_iommu_fwspec_get(dev);
+	if (fwspec == NULL)
+		return -ENXIO;
+
+	smmu = find_smmu(fwspec->iommu_dev);
+	if (smmu == NULL)
+		return -ENXIO;
+
+	return arm_smmu_dt_add_device_legacy(smmu, dev, fwspec);
+}
+
+static int arm_smmu_dt_xlate_generic(struct device *dev,
+				    const struct dt_phandle_args *spec)
+{
+	uint32_t mask, fwid = 0;
+
+	if (spec->args_count > 0)
+		fwid |= (SMR_ID_MASK & spec->args[0]) << SMR_ID_SHIFT;
+
+	if (spec->args_count > 1)
+		fwid |= (SMR_MASK_MASK & spec->args[1]) << SMR_MASK_SHIFT;
+	else if (!of_property_read_u32(spec->np, "stream-match-mask", &mask))
+		fwid |= (SMR_MASK_MASK & mask) << SMR_MASK_SHIFT;
+
+	return iommu_fwspec_add_ids(dev, &fwid, 1);
+}
+
 static struct arm_smmu_device *find_smmu_for_device(struct device *dev)
 {
 	struct arm_smmu_device *smmu;
@@ -2837,6 +2873,7 @@ static void arm_smmu_iommu_domain_teardown(struct domain *d)
 static const struct iommu_ops arm_smmu_iommu_ops = {
     .init = arm_smmu_iommu_domain_init,
     .hwdom_init = arm_smmu_iommu_hwdom_init,
+    .add_device = arm_smmu_dt_add_device_generic,
     .teardown = arm_smmu_iommu_domain_teardown,
     .iotlb_flush = arm_smmu_iotlb_flush,
     .iotlb_flush_all = arm_smmu_iotlb_flush_all,
@@ -2844,9 +2881,10 @@ static const struct iommu_ops arm_smmu_iommu_ops = {
     .reassign_device = arm_smmu_reassign_dev,
     .map_page = arm_iommu_map_page,
     .unmap_page = arm_iommu_unmap_page,
+    .dt_xlate = arm_smmu_dt_xlate_generic,
 };
 
-static __init const struct arm_smmu_device *find_smmu(const struct device *dev)
+static struct arm_smmu_device *find_smmu(const struct device *dev)
 {
 	struct arm_smmu_device *smmu;
 	bool found = false;
diff --git a/xen/drivers/passthrough/device_tree.c b/xen/drivers/passthrough/device_tree.c
index 9249f21c01..98f2aa0dad 100644
--- a/xen/drivers/passthrough/device_tree.c
+++ b/xen/drivers/passthrough/device_tree.c
@@ -159,22 +159,7 @@ int iommu_add_dt_device(struct dt_device_node *np)
          * these callback implemented.
          */
         if ( !ops->add_device || !ops->dt_xlate )
-        {
-            /*
-             * Some Device Trees may expose both legacy SMMU and generic
-             * IOMMU bindings together. However, the SMMU driver is only
-             * supporting the former and will protect them during the
-             * initialization. So we need to skip them and not return
-             * error here.
-             *
-             * XXX: This can be dropped when the SMMU is able to deal
-             * with generic bindings.
-             */
-            if ( dt_device_is_protected(np) )
-                return 0;
-            else
-                return -EINVAL;
-        }
+            return -EINVAL;
 
         if ( !dt_device_is_available(iommu_spec.np) )
             break;
-- 
2.17.1

Re: [PATCH v6 1/4] arm,smmu: switch to using iommu_fwspec functions

[Julien Grall]

Hi Stefano,

On 03/08/2021 01:24, Stefano Stabellini wrote:
> From: Brian Woods <brian.woods@xilinx.com>
> 
> Modify the smmu driver so that it uses the iommu_fwspec helper
> functions.  This means both ARM IOMMU drivers will both use the
> iommu_fwspec helper functions, making enabling generic device tree
> bindings in the SMMU driver much cleaner.
> 
> Signed-off-by: Brian Woods <brian.woods@xilinx.com>
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
> Reviewed-by: Rahul Singh <rahul.singh@arm.com>

Acked-by: Julien Grall <jgrall@amazon.com>

Cheers,

-- 
Julien Grall

Re: [PATCH v6 2/4] xen: do not return -EEXIST if iommu_add_dt_device is called twice

[Julien Grall]

Hi Stefano,

On 03/08/2021 01:24, Stefano Stabellini wrote:
> iommu_add_dt_device() returns -EEXIST if the device was already
> registered. At the moment, this can only happen if the device was
> already assigned to a domain (either dom0 at boot or via
> XEN_DOMCTL_assign_device).
> 
> In a follow-up patch, we will convert the SMMU driver to use the FW
> spec. When the legacy bindings are used, all the devices will be
> registered at probe. Therefore, iommu_add_dt_device() will always
> returns -EEXIST.

So this patch needs to be first in the series to avoid breaking 
bisection. I will re-order the patches on commit.

> 
> Currently, one caller (XEN_DOMCTL_assign_device) will check the return
> and ignore -EEXIST. All the other will fail because it was technically a
> programming error.
> 
> However, there is no harm to call iommu_add_dt_device() twice, so we can
> simply return 0.
> 
> With that in place the caller doesn't need to check -EEXIST anymore, so
> remove the check.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>

Acked-by: Julien Grall <jgrall@amazon.com>

Cheers,

-- 
Julien Grall

Re: [PATCH v6 0/4] Generic SMMU Bindings

[Julien Grall]

On 03/08/2021 01:23, Stefano Stabellini wrote:
> Hi all,

Hi Stefano,

> This series introduces support for the generic SMMU bindings to
> xen/drivers/passthrough/arm/smmu.c.

Committed.

Cheers,

-- 
Julien Grall