From: Dave Jiang <dave.jiang@intel.com>
To: vkoul@kernel.org, megha.dey@linux.intel.com, maz@kernel.org,
bhelgaas@google.com, rafael@kernel.org,
gregkh@linuxfoundation.org, tglx@linutronix.de, hpa@zytor.com,
alex.williamson@redhat.com, jacob.jun.pan@intel.com,
ashok.raj@intel.com, jgg@mellanox.com, yi.l.liu@intel.com,
baolu.lu@intel.com, kevin.tian@intel.com,
sanjay.k.kumar@intel.com, tony.luck@intel.com,
jing.lin@intel.com, dan.j.williams@intel.com,
kwankhede@nvidia.com, eric.auger@redhat.com, parav@mellanox.com
Cc: dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org,
x86@kernel.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org
Subject: [PATCH RFC 04/15] drivers/base: Add support for a new IMS irq domain
Date: Tue, 21 Apr 2020 16:34:11 -0700 [thread overview]
Message-ID: <158751205175.36773.1874642824360728883.stgit@djiang5-desk3.ch.intel.com> (raw)
In-Reply-To: <158751095889.36773.6009825070990637468.stgit@djiang5-desk3.ch.intel.com>
From: Megha Dey <megha.dey@linux.intel.com>
Add support for the creation of a new IMS irq domain. It creates a new
irq chip associated with the IMS domain and adds the necessary domain
operations to it.
Also, add a new config option MSI_IMS which must be enabled by any driver
who would want to use the IMS infrastructure.
Signed-off-by: Megha Dey <megha.dey@linux.intel.com>
---
arch/x86/include/asm/hw_irq.h | 7 +++
drivers/base/Kconfig | 9 +++
drivers/base/Makefile | 1
drivers/base/ims-msi.c | 100 ++++++++++++++++++++++++++++++++++++++
drivers/base/platform-msi.c | 6 +-
drivers/vfio/mdev/mdev_core.c | 6 ++
drivers/vfio/mdev/mdev_private.h | 1
include/linux/mdev.h | 3 +
include/linux/msi.h | 2 +
9 files changed, 131 insertions(+), 4 deletions(-)
create mode 100644 drivers/base/ims-msi.c
diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index 4154bc5f6a4e..2e355aa6ba50 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -62,6 +62,7 @@ enum irq_alloc_type {
X86_IRQ_ALLOC_TYPE_MSIX,
X86_IRQ_ALLOC_TYPE_DMAR,
X86_IRQ_ALLOC_TYPE_UV,
+ X86_IRQ_ALLOC_TYPE_IMS,
};
struct irq_alloc_info {
@@ -83,6 +84,12 @@ struct irq_alloc_info {
irq_hw_number_t msi_hwirq;
};
#endif
+#ifdef CONFIG_MSI_IMS
+ struct {
+ struct device *dev;
+ irq_hw_number_t ims_hwirq;
+ };
+#endif
#ifdef CONFIG_X86_IO_APIC
struct {
int ioapic_id;
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index 5f0bc74d2409..877e0fdee013 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -209,4 +209,13 @@ config GENERIC_ARCH_TOPOLOGY
appropriate scaling, sysfs interface for reading capacity values at
runtime.
+config MSI_IMS
+ bool "Device Specific Interrupt Message Storage (IMS)"
+ depends on X86
+ select GENERIC_MSI_IRQ_DOMAIN
+ select IRQ_REMAP
+ help
+ This allows device drivers to enable device specific
+ interrupt message storage (IMS) besides standard MSI-X interrupts.
+
endmenu
diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index 157452080f3d..659b9b0c0b8a 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_SOC_BUS) += soc.o
obj-$(CONFIG_PINCTRL) += pinctrl.o
obj-$(CONFIG_DEV_COREDUMP) += devcoredump.o
obj-$(CONFIG_GENERIC_MSI_IRQ_DOMAIN) += platform-msi.o
+obj-$(CONFIG_MSI_IMS) += ims-msi.o
obj-$(CONFIG_GENERIC_ARCH_TOPOLOGY) += arch_topology.o
obj-y += test/
diff --git a/drivers/base/ims-msi.c b/drivers/base/ims-msi.c
new file mode 100644
index 000000000000..738f6d153155
--- /dev/null
+++ b/drivers/base/ims-msi.c
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Support for Device Specific IMS interrupts.
+ *
+ * Copyright © 2019 Intel Corporation.
+ *
+ * Author: Megha Dey <megha.dey@intel.com>
+ */
+
+#include <linux/dmar.h>
+#include <linux/irq.h>
+#include <linux/mdev.h>
+#include <linux/pci.h>
+
+/*
+ * Determine if a dev is mdev or not. Return NULL if not mdev device.
+ * Return mdev's parent dev if success.
+ */
+static inline struct device *mdev_to_parent(struct device *dev)
+{
+ struct device *ret = NULL;
+ struct device *(*fn)(struct device *dev);
+ struct bus_type *bus = symbol_get(mdev_bus_type);
+
+ if (bus && dev->bus == bus) {
+ fn = symbol_get(mdev_dev_to_parent_dev);
+ ret = fn(dev);
+ symbol_put(mdev_dev_to_parent_dev);
+ symbol_put(mdev_bus_type);
+ }
+
+ return ret;
+}
+
+static irq_hw_number_t dev_ims_get_hwirq(struct msi_domain_info *info,
+ msi_alloc_info_t *arg)
+{
+ return arg->ims_hwirq;
+}
+
+static int dev_ims_prepare(struct irq_domain *domain, struct device *dev,
+ int nvec, msi_alloc_info_t *arg)
+{
+ if (dev_is_mdev(dev))
+ dev = mdev_to_parent(dev);
+
+ init_irq_alloc_info(arg, NULL);
+ arg->dev = dev;
+ arg->type = X86_IRQ_ALLOC_TYPE_IMS;
+
+ return 0;
+}
+
+static void dev_ims_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
+{
+ arg->ims_hwirq = platform_msi_calc_hwirq(desc);
+}
+
+static struct msi_domain_ops dev_ims_domain_ops = {
+ .get_hwirq = dev_ims_get_hwirq,
+ .msi_prepare = dev_ims_prepare,
+ .set_desc = dev_ims_set_desc,
+};
+
+static struct irq_chip dev_ims_ir_controller = {
+ .name = "IR-DEV-IMS",
+ .irq_ack = irq_chip_ack_parent,
+ .irq_retrigger = irq_chip_retrigger_hierarchy,
+ .irq_set_vcpu_affinity = irq_chip_set_vcpu_affinity_parent,
+ .flags = IRQCHIP_SKIP_SET_WAKE,
+ .irq_write_msi_msg = platform_msi_write_msg,
+};
+
+static struct msi_domain_info ims_ir_domain_info = {
+ .flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS,
+ .ops = &dev_ims_domain_ops,
+ .chip = &dev_ims_ir_controller,
+ .handler = handle_edge_irq,
+ .handler_name = "edge",
+};
+
+struct irq_domain *arch_create_ims_irq_domain(struct irq_domain *parent,
+ const char *name)
+{
+ struct fwnode_handle *fn;
+ struct irq_domain *domain;
+
+ fn = irq_domain_alloc_named_fwnode(name);
+ if (!fn)
+ return NULL;
+
+ domain = msi_create_irq_domain(fn, &ims_ir_domain_info, parent);
+ if (!domain)
+ return NULL;
+
+ irq_domain_update_bus_token(domain, DOMAIN_BUS_PLATFORM_MSI);
+ irq_domain_free_fwnode(fn);
+
+ return domain;
+}
diff --git a/drivers/base/platform-msi.c b/drivers/base/platform-msi.c
index 2696aa75983b..59160e8cbfb1 100644
--- a/drivers/base/platform-msi.c
+++ b/drivers/base/platform-msi.c
@@ -31,12 +31,11 @@ struct platform_msi_priv_data {
/* The devid allocator */
static DEFINE_IDA(platform_msi_devid_ida);
-#ifdef GENERIC_MSI_DOMAIN_OPS
/*
* Convert an msi_desc to a globaly unique identifier (per-device
* devid + msi_desc position in the msi_list).
*/
-static irq_hw_number_t platform_msi_calc_hwirq(struct msi_desc *desc)
+irq_hw_number_t platform_msi_calc_hwirq(struct msi_desc *desc)
{
u32 devid;
@@ -45,6 +44,7 @@ static irq_hw_number_t platform_msi_calc_hwirq(struct msi_desc *desc)
return (devid << (32 - DEV_ID_SHIFT)) | desc->platform.msi_index;
}
+#ifdef GENERIC_MSI_DOMAIN_OPS
static void platform_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
{
arg->desc = desc;
@@ -76,7 +76,7 @@ static void platform_msi_update_dom_ops(struct msi_domain_info *info)
ops->set_desc = platform_msi_set_desc;
}
-static void platform_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
+void platform_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
{
struct msi_desc *desc = irq_data_get_msi_desc(data);
struct platform_msi_priv_data *priv_data;
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index b558d4cfd082..cecc6a6bdbef 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -33,6 +33,12 @@ struct device *mdev_parent_dev(struct mdev_device *mdev)
}
EXPORT_SYMBOL(mdev_parent_dev);
+struct device *mdev_dev_to_parent_dev(struct device *dev)
+{
+ return to_mdev_device(dev)->parent->dev;
+}
+EXPORT_SYMBOL(mdev_dev_to_parent_dev);
+
void *mdev_get_drvdata(struct mdev_device *mdev)
{
return mdev->driver_data;
diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h
index 7d922950caaf..c21f1305a76b 100644
--- a/drivers/vfio/mdev/mdev_private.h
+++ b/drivers/vfio/mdev/mdev_private.h
@@ -36,7 +36,6 @@ struct mdev_device {
};
#define to_mdev_device(dev) container_of(dev, struct mdev_device, dev)
-#define dev_is_mdev(d) ((d)->bus == &mdev_bus_type)
struct mdev_type {
struct kobject kobj;
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index 0ce30ca78db0..fa2344e239ef 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -144,5 +144,8 @@ void mdev_unregister_driver(struct mdev_driver *drv);
struct device *mdev_parent_dev(struct mdev_device *mdev);
struct device *mdev_dev(struct mdev_device *mdev);
struct mdev_device *mdev_from_dev(struct device *dev);
+struct device *mdev_dev_to_parent_dev(struct device *dev);
+
+#define dev_is_mdev(dev) ((dev)->bus == symbol_get(mdev_bus_type))
#endif /* MDEV_H */
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 3890b143b04d..80386468a7bc 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -418,6 +418,8 @@ int platform_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
void platform_msi_domain_free(struct irq_domain *domain, unsigned int virq,
unsigned int nvec);
void *platform_msi_get_host_data(struct irq_domain *domain);
+irq_hw_number_t platform_msi_calc_hwirq(struct msi_desc *desc);
+void platform_msi_write_msg(struct irq_data *data, struct msi_msg *msg);
#endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */
#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
next prev parent reply other threads:[~2020-04-21 23:34 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-21 23:33 [PATCH RFC 00/15] Add VFIO mediated device support and IMS support for the idxd driver Dave Jiang
2020-04-21 23:33 ` [PATCH RFC 01/15] drivers/base: Introduce platform_msi_ops Dave Jiang
2020-04-26 7:01 ` Greg KH
2020-04-27 21:38 ` Dave Jiang
2020-04-28 7:34 ` Greg KH
2020-04-21 23:33 ` [PATCH RFC 02/15] drivers/base: Introduce a new platform-msi list Dave Jiang
2020-04-25 21:13 ` Thomas Gleixner
2020-05-04 0:08 ` Dey, Megha
2020-04-21 23:34 ` [PATCH RFC 03/15] drivers/base: Allocate/free platform-msi interrupts by group Dave Jiang
2020-04-25 21:23 ` Thomas Gleixner
2020-05-04 0:08 ` Dey, Megha
2020-04-21 23:34 ` Dave Jiang [this message]
2020-04-23 20:11 ` [PATCH RFC 04/15] drivers/base: Add support for a new IMS irq domain Jason Gunthorpe
2020-05-01 22:30 ` Dey, Megha
2020-05-03 22:25 ` Jason Gunthorpe
2020-05-03 22:40 ` Dey, Megha
2020-05-03 22:46 ` Jason Gunthorpe
2020-05-04 0:25 ` Dey, Megha
2020-05-04 12:14 ` Jason Gunthorpe
2020-05-06 10:27 ` Tian, Kevin
2020-04-25 21:38 ` Thomas Gleixner
2020-05-04 0:11 ` Dey, Megha
2020-04-21 23:34 ` [PATCH RFC 05/15] ims-msi: Add mask/unmask routines Dave Jiang
2020-04-25 21:49 ` Thomas Gleixner
2020-05-04 0:16 ` Dey, Megha
2020-04-21 23:34 ` [PATCH RFC 06/15] ims-msi: Enable IMS interrupts Dave Jiang
2020-04-25 22:13 ` Thomas Gleixner
2020-05-04 0:17 ` Dey, Megha
2020-04-21 23:34 ` [PATCH RFC 07/15] Documentation: Interrupt Message store Dave Jiang
2020-04-23 20:04 ` Jason Gunthorpe
2020-05-01 22:32 ` Dey, Megha
2020-05-03 22:28 ` Jason Gunthorpe
2020-05-03 22:41 ` Dey, Megha
2020-04-21 23:34 ` [PATCH RFC 08/15] vfio/mdev: Add a member for iommu domain in mdev_device Dave Jiang
2020-04-21 23:34 ` [PATCH RFC 09/15] vfio/type1: Save domain when attach domain to mdev Dave Jiang
2020-04-21 23:34 ` [PATCH RFC 10/15] dmaengine: idxd: add config support for readonly devices Dave Jiang
2020-04-21 23:34 ` [PATCH RFC 11/15] dmaengine: idxd: add IMS support in base driver Dave Jiang
2020-04-21 23:35 ` [PATCH RFC 12/15] dmaengine: idxd: add device support functions in prep for mdev Dave Jiang
2020-04-21 23:35 ` [PATCH RFC 13/15] dmaengine: idxd: add support for VFIO mediated device Dave Jiang
2020-04-21 23:35 ` [PATCH RFC 14/15] dmaengine: idxd: add error notification from host driver to " Dave Jiang
2020-04-21 23:35 ` [PATCH RFC 15/15] dmaengine: idxd: add ABI documentation for mediated device support Dave Jiang
2020-04-21 23:54 ` [PATCH RFC 00/15] Add VFIO mediated device support and IMS support for the idxd driver Jason Gunthorpe
2020-04-22 0:53 ` Tian, Kevin
2020-04-22 11:50 ` Jason Gunthorpe
2020-04-22 21:14 ` Raj, Ashok
2020-04-23 19:12 ` Jason Gunthorpe
2020-04-24 3:27 ` Tian, Kevin
2020-04-24 12:44 ` Jason Gunthorpe
2020-04-24 16:25 ` Tian, Kevin
2020-04-24 18:12 ` Jason Gunthorpe
2020-04-26 5:18 ` Tian, Kevin
2020-04-26 19:13 ` Jason Gunthorpe
2020-04-27 3:43 ` Alex Williamson
2020-04-27 11:58 ` Jason Gunthorpe
2020-04-27 13:19 ` Alex Williamson
2020-04-27 13:22 ` Jason Gunthorpe
2020-04-27 14:18 ` Alex Williamson
2020-04-27 14:25 ` Jason Gunthorpe
2020-04-27 15:41 ` Alex Williamson
2020-04-27 16:16 ` Jason Gunthorpe
2020-04-27 16:25 ` Dave Jiang
2020-04-27 21:56 ` Jason Gunthorpe
2020-04-29 9:42 ` Tian, Kevin
2020-05-08 20:47 ` Raj, Ashok
2020-05-08 23:16 ` Jason Gunthorpe
2020-05-08 23:52 ` Dave Jiang
2020-05-09 0:09 ` Raj, Ashok
2020-05-09 12:21 ` Jason Gunthorpe
2020-05-13 2:29 ` Jason Wang
2020-05-13 8:30 ` Tian, Kevin
2020-05-13 12:40 ` Jason Gunthorpe
2020-04-27 12:13 ` Tian, Kevin
2020-04-27 12:55 ` Jason Gunthorpe
2020-04-22 21:24 ` Dan Williams
2020-04-23 19:17 ` Dan Williams
2020-04-23 19:49 ` Jason Gunthorpe
2020-05-01 22:31 ` Dey, Megha
2020-05-03 22:21 ` Jason Gunthorpe
2020-05-03 22:32 ` Dey, Megha
2020-04-23 19:18 ` Jason Gunthorpe
2020-05-01 22:31 ` Dey, Megha
2020-05-03 22:22 ` Jason Gunthorpe
2020-05-03 22:31 ` Dey, Megha
2020-05-03 22:36 ` Jason Gunthorpe
2020-05-04 0:20 ` Dey, Megha
2020-04-22 23:04 ` Dey, Megha
2020-04-23 19:44 ` Jason Gunthorpe
2020-05-01 22:32 ` Dey, Megha
2020-04-24 6:31 ` Jason Wang
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