[PATCH v2 00/18] Make vfio_mdev type safe

[PATCH v2 00/18] Make vfio_mdev type safe

[Jason Gunthorpe]

vfio_mdev has a number of different objects: mdev_parent, mdev_type and
mdev_device.

Unfortunately the types of these have been erased in various places
throughout the API, and this makes it very hard to understand this code or
maintain it by the time it reaches all of the drivers.

This series puts in all the types and aligns some of the design with the
driver core standard for a driver core bus driver:

 - Replace 'struct device *' with 'struct mdev_device *
 - Replace 'struct device *' with 'struct mdev_type *' and
   mtype_get_parent_dev()
 - Replace 'struct kobject *' with 'struct mdev_type *'

Now that types are clear it is easy to spot a few places that have
duplicated information.

More significantly we can now understand how to directly fix the
obfuscated 'kobj->name' matching by realizing the the kobj is a mdev_type,
which is linked to the supported_types_list provided by the driver, and
thus the core code can directly return the array indexes all the drivers
actually want.

v2:
 - Use a mdev_type local in mdev_create_sysfs_files
 - Rename the goto unwind labels in mdev_device_free()
 - Reorder patches, annotate reviewed-by's thanks all
v1: https://lore.kernel.org/r/0-v1-7dedf20b2b75+4f785-vfio2_jgg@nvidia.com

Jason Gunthorpe (18):
  vfio/mdev: Fix missing static's on MDEV_TYPE_ATTR's
  vfio/mdev: Do not allow a mdev_type to have a NULL parent pointer
  vfio/mdev: Add missing typesafety around mdev_device
  vfio/mdev: Simplify driver registration
  vfio/mdev: Use struct mdev_type in struct mdev_device
  vfio/mdev: Expose mdev_get/put_parent to mdev_private.h
  vfio/mdev: Add missing reference counting to mdev_type
  vfio/mdev: Reorganize mdev_device_create()
  vfio/mdev: Add missing error handling to dev_set_name()
  vfio/mdev: Remove duplicate storage of parent in mdev_device
  vfio/mdev: Add mdev/mtype_get_type_group_id()
  vfio/mtty: Use mdev_get_type_group_id()
  vfio/mdpy: Use mdev_get_type_group_id()
  vfio/mbochs: Use mdev_get_type_group_id()
  vfio/gvt: Make DRM_I915_GVT depend on VFIO_MDEV
  vfio/gvt: Use mdev_get_type_group_id()
  vfio/mdev: Remove kobj from mdev_parent_ops->create()
  vfio/mdev: Correct the function signatures for the
    mdev_type_attributes

 .../driver-api/vfio-mediated-device.rst       |   9 +-
 drivers/gpu/drm/i915/Kconfig                  |   1 +
 drivers/gpu/drm/i915/gvt/gvt.c                |  41 ++---
 drivers/gpu/drm/i915/gvt/gvt.h                |   4 +-
 drivers/gpu/drm/i915/gvt/kvmgt.c              |   7 +-
 drivers/s390/cio/vfio_ccw_ops.c               |  17 +-
 drivers/s390/crypto/vfio_ap_ops.c             |  14 +-
 drivers/vfio/mdev/mdev_core.c                 | 174 +++++++-----------
 drivers/vfio/mdev/mdev_driver.c               |  19 +-
 drivers/vfio/mdev/mdev_private.h              |  40 ++--
 drivers/vfio/mdev/mdev_sysfs.c                |  59 +++---
 drivers/vfio/mdev/vfio_mdev.c                 |  29 +--
 drivers/vfio/vfio_iommu_type1.c               |  25 +--
 include/linux/mdev.h                          |  80 +++++---
 samples/vfio-mdev/mbochs.c                    |  55 +++---
 samples/vfio-mdev/mdpy.c                      |  56 +++---
 samples/vfio-mdev/mtty.c                      |  66 ++-----
 17 files changed, 313 insertions(+), 383 deletions(-)

-- 
2.31.1

[Intel-gfx] [PATCH v2 00/18] Make vfio_mdev type safe

[Jason Gunthorpe]

vfio_mdev has a number of different objects: mdev_parent, mdev_type and
mdev_device.

Unfortunately the types of these have been erased in various places
throughout the API, and this makes it very hard to understand this code or
maintain it by the time it reaches all of the drivers.

This series puts in all the types and aligns some of the design with the
driver core standard for a driver core bus driver:

 - Replace 'struct device *' with 'struct mdev_device *
 - Replace 'struct device *' with 'struct mdev_type *' and
   mtype_get_parent_dev()
 - Replace 'struct kobject *' with 'struct mdev_type *'

Now that types are clear it is easy to spot a few places that have
duplicated information.

More significantly we can now understand how to directly fix the
obfuscated 'kobj->name' matching by realizing the the kobj is a mdev_type,
which is linked to the supported_types_list provided by the driver, and
thus the core code can directly return the array indexes all the drivers
actually want.

v2:
 - Use a mdev_type local in mdev_create_sysfs_files
 - Rename the goto unwind labels in mdev_device_free()
 - Reorder patches, annotate reviewed-by's thanks all
v1: https://lore.kernel.org/r/0-v1-7dedf20b2b75+4f785-vfio2_jgg@nvidia.com

Jason Gunthorpe (18):
  vfio/mdev: Fix missing static's on MDEV_TYPE_ATTR's
  vfio/mdev: Do not allow a mdev_type to have a NULL parent pointer
  vfio/mdev: Add missing typesafety around mdev_device
  vfio/mdev: Simplify driver registration
  vfio/mdev: Use struct mdev_type in struct mdev_device
  vfio/mdev: Expose mdev_get/put_parent to mdev_private.h
  vfio/mdev: Add missing reference counting to mdev_type
  vfio/mdev: Reorganize mdev_device_create()
  vfio/mdev: Add missing error handling to dev_set_name()
  vfio/mdev: Remove duplicate storage of parent in mdev_device
  vfio/mdev: Add mdev/mtype_get_type_group_id()
  vfio/mtty: Use mdev_get_type_group_id()
  vfio/mdpy: Use mdev_get_type_group_id()
  vfio/mbochs: Use mdev_get_type_group_id()
  vfio/gvt: Make DRM_I915_GVT depend on VFIO_MDEV
  vfio/gvt: Use mdev_get_type_group_id()
  vfio/mdev: Remove kobj from mdev_parent_ops->create()
  vfio/mdev: Correct the function signatures for the
    mdev_type_attributes

 .../driver-api/vfio-mediated-device.rst       |   9 +-
 drivers/gpu/drm/i915/Kconfig                  |   1 +
 drivers/gpu/drm/i915/gvt/gvt.c                |  41 ++---
 drivers/gpu/drm/i915/gvt/gvt.h                |   4 +-
 drivers/gpu/drm/i915/gvt/kvmgt.c              |   7 +-
 drivers/s390/cio/vfio_ccw_ops.c               |  17 +-
 drivers/s390/crypto/vfio_ap_ops.c             |  14 +-
 drivers/vfio/mdev/mdev_core.c                 | 174 +++++++-----------
 drivers/vfio/mdev/mdev_driver.c               |  19 +-
 drivers/vfio/mdev/mdev_private.h              |  40 ++--
 drivers/vfio/mdev/mdev_sysfs.c                |  59 +++---
 drivers/vfio/mdev/vfio_mdev.c                 |  29 +--
 drivers/vfio/vfio_iommu_type1.c               |  25 +--
 include/linux/mdev.h                          |  80 +++++---
 samples/vfio-mdev/mbochs.c                    |  55 +++---
 samples/vfio-mdev/mdpy.c                      |  56 +++---
 samples/vfio-mdev/mtty.c                      |  66 ++-----
 17 files changed, 313 insertions(+), 383 deletions(-)

-- 
2.31.1

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH v2 00/18] Make vfio_mdev type safe

[Jason Gunthorpe]

vfio_mdev has a number of different objects: mdev_parent, mdev_type and
mdev_device.

Unfortunately the types of these have been erased in various places
throughout the API, and this makes it very hard to understand this code or
maintain it by the time it reaches all of the drivers.

This series puts in all the types and aligns some of the design with the
driver core standard for a driver core bus driver:

 - Replace 'struct device *' with 'struct mdev_device *
 - Replace 'struct device *' with 'struct mdev_type *' and
   mtype_get_parent_dev()
 - Replace 'struct kobject *' with 'struct mdev_type *'

Now that types are clear it is easy to spot a few places that have
duplicated information.

More significantly we can now understand how to directly fix the
obfuscated 'kobj->name' matching by realizing the the kobj is a mdev_type,
which is linked to the supported_types_list provided by the driver, and
thus the core code can directly return the array indexes all the drivers
actually want.

v2:
 - Use a mdev_type local in mdev_create_sysfs_files
 - Rename the goto unwind labels in mdev_device_free()
 - Reorder patches, annotate reviewed-by's thanks all
v1: https://lore.kernel.org/r/0-v1-7dedf20b2b75+4f785-vfio2_jgg@nvidia.com

Jason Gunthorpe (18):
  vfio/mdev: Fix missing static's on MDEV_TYPE_ATTR's
  vfio/mdev: Do not allow a mdev_type to have a NULL parent pointer
  vfio/mdev: Add missing typesafety around mdev_device
  vfio/mdev: Simplify driver registration
  vfio/mdev: Use struct mdev_type in struct mdev_device
  vfio/mdev: Expose mdev_get/put_parent to mdev_private.h
  vfio/mdev: Add missing reference counting to mdev_type
  vfio/mdev: Reorganize mdev_device_create()
  vfio/mdev: Add missing error handling to dev_set_name()
  vfio/mdev: Remove duplicate storage of parent in mdev_device
  vfio/mdev: Add mdev/mtype_get_type_group_id()
  vfio/mtty: Use mdev_get_type_group_id()
  vfio/mdpy: Use mdev_get_type_group_id()
  vfio/mbochs: Use mdev_get_type_group_id()
  vfio/gvt: Make DRM_I915_GVT depend on VFIO_MDEV
  vfio/gvt: Use mdev_get_type_group_id()
  vfio/mdev: Remove kobj from mdev_parent_ops->create()
  vfio/mdev: Correct the function signatures for the
    mdev_type_attributes

 .../driver-api/vfio-mediated-device.rst       |   9 +-
 drivers/gpu/drm/i915/Kconfig                  |   1 +
 drivers/gpu/drm/i915/gvt/gvt.c                |  41 ++---
 drivers/gpu/drm/i915/gvt/gvt.h                |   4 +-
 drivers/gpu/drm/i915/gvt/kvmgt.c              |   7 +-
 drivers/s390/cio/vfio_ccw_ops.c               |  17 +-
 drivers/s390/crypto/vfio_ap_ops.c             |  14 +-
 drivers/vfio/mdev/mdev_core.c                 | 174 +++++++-----------
 drivers/vfio/mdev/mdev_driver.c               |  19 +-
 drivers/vfio/mdev/mdev_private.h              |  40 ++--
 drivers/vfio/mdev/mdev_sysfs.c                |  59 +++---
 drivers/vfio/mdev/vfio_mdev.c                 |  29 +--
 drivers/vfio/vfio_iommu_type1.c               |  25 +--
 include/linux/mdev.h                          |  80 +++++---
 samples/vfio-mdev/mbochs.c                    |  55 +++---
 samples/vfio-mdev/mdpy.c                      |  56 +++---
 samples/vfio-mdev/mtty.c                      |  66 ++-----
 17 files changed, 313 insertions(+), 383 deletions(-)

-- 
2.31.1

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH v2 01/18] vfio/mdev: Fix missing static's on MDEV_TYPE_ATTR's

[Jason Gunthorpe]

These should always be prefixed with static, otherwise compilation
will fail on non-modular builds with

ld: samples/vfio-mdev/mbochs.o:(.data+0x2e0): multiple definition of `mdev_type_attr_name'; samples/vfio-mdev/mdpy.o:(.data+0x240): first defined here

Fixes: a5e6e6505f38 ("sample: vfio bochs vbe display (host device for bochs-drm)")
Fixes: d61fc96f47fd ("sample: vfio mdev display - host device")
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 samples/vfio-mdev/mbochs.c | 10 +++++-----
 samples/vfio-mdev/mdpy.c   | 10 +++++-----
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index e03068917273d4..365afbe2dea558 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -1334,7 +1334,7 @@ static const struct attribute_group mdev_dev_group = {
 	.attrs = mdev_dev_attrs,
 };
 
-const struct attribute_group *mdev_dev_groups[] = {
+static const struct attribute_group *mdev_dev_groups[] = {
 	&mdev_dev_group,
 	NULL,
 };
@@ -1344,7 +1344,7 @@ name_show(struct kobject *kobj, struct device *dev, char *buf)
 {
 	return sprintf(buf, "%s\n", kobj->name);
 }
-MDEV_TYPE_ATTR_RO(name);
+static MDEV_TYPE_ATTR_RO(name);
 
 static ssize_t
 description_show(struct kobject *kobj, struct device *dev, char *buf)
@@ -1354,7 +1354,7 @@ description_show(struct kobject *kobj, struct device *dev, char *buf)
 	return sprintf(buf, "virtual display, %d MB video memory\n",
 		       type ? type->mbytes  : 0);
 }
-MDEV_TYPE_ATTR_RO(description);
+static MDEV_TYPE_ATTR_RO(description);
 
 static ssize_t
 available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
@@ -1364,14 +1364,14 @@ available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
 
 	return sprintf(buf, "%d\n", count);
 }
-MDEV_TYPE_ATTR_RO(available_instances);
+static MDEV_TYPE_ATTR_RO(available_instances);
 
 static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
 			       char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
 }
-MDEV_TYPE_ATTR_RO(device_api);
+static MDEV_TYPE_ATTR_RO(device_api);
 
 static struct attribute *mdev_types_attrs[] = {
 	&mdev_type_attr_name.attr,
diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c
index 9894693f3be178..d4ec2b52ca49a1 100644
--- a/samples/vfio-mdev/mdpy.c
+++ b/samples/vfio-mdev/mdpy.c
@@ -658,7 +658,7 @@ static const struct attribute_group mdev_dev_group = {
 	.attrs = mdev_dev_attrs,
 };
 
-const struct attribute_group *mdev_dev_groups[] = {
+static const struct attribute_group *mdev_dev_groups[] = {
 	&mdev_dev_group,
 	NULL,
 };
@@ -668,7 +668,7 @@ name_show(struct kobject *kobj, struct device *dev, char *buf)
 {
 	return sprintf(buf, "%s\n", kobj->name);
 }
-MDEV_TYPE_ATTR_RO(name);
+static MDEV_TYPE_ATTR_RO(name);
 
 static ssize_t
 description_show(struct kobject *kobj, struct device *dev, char *buf)
@@ -679,21 +679,21 @@ description_show(struct kobject *kobj, struct device *dev, char *buf)
 		       type ? type->width  : 0,
 		       type ? type->height : 0);
 }
-MDEV_TYPE_ATTR_RO(description);
+static MDEV_TYPE_ATTR_RO(description);
 
 static ssize_t
 available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
 {
 	return sprintf(buf, "%d\n", max_devices - mdpy_count);
 }
-MDEV_TYPE_ATTR_RO(available_instances);
+static MDEV_TYPE_ATTR_RO(available_instances);
 
 static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
 			       char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
 }
-MDEV_TYPE_ATTR_RO(device_api);
+static MDEV_TYPE_ATTR_RO(device_api);
 
 static struct attribute *mdev_types_attrs[] = {
 	&mdev_type_attr_name.attr,
-- 
2.31.1

Re: [PATCH v2 01/18] vfio/mdev: Fix missing static's on MDEV_TYPE_ATTR's

[Christoph Hellwig]

On Tue, Apr 06, 2021 at 04:40:24PM -0300, Jason Gunthorpe wrote:
> These should always be prefixed with static, otherwise compilation
> will fail on non-modular builds with
> 
> ld: samples/vfio-mdev/mbochs.o:(.data+0x2e0): multiple definition of `mdev_type_attr_name'; samples/vfio-mdev/mdpy.o:(.data+0x240): first defined here
> 
> Fixes: a5e6e6505f38 ("sample: vfio bochs vbe display (host device for bochs-drm)")
> Fixes: d61fc96f47fd ("sample: vfio mdev display - host device")
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

[PATCH v2 02/18] vfio/mdev: Do not allow a mdev_type to have a NULL parent pointer

[Jason Gunthorpe]

There is a small race where the parent is NULL even though the kobj has
already been made visible in sysfs.

For instance the attribute_group is made visible in sysfs_create_files()
and the mdev_type_attr_show() does:

    ret = attr->show(kobj, type->parent->dev, buf);

Which will crash on NULL parent. Move the parent setup to before the type
pointer leaves the stack frame.

Fixes: 7b96953bc640 ("vfio: Mediated device Core driver")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/vfio/mdev/mdev_sysfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index 917fd84c1c6f24..367ff5412a3879 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -105,6 +105,7 @@ static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
 		return ERR_PTR(-ENOMEM);
 
 	type->kobj.kset = parent->mdev_types_kset;
+	type->parent = parent;
 
 	ret = kobject_init_and_add(&type->kobj, &mdev_type_ktype, NULL,
 				   "%s-%s", dev_driver_string(parent->dev),
@@ -132,7 +133,6 @@ static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
 	}
 
 	type->group = group;
-	type->parent = parent;
 	return type;
 
 attrs_failed:
-- 
2.31.1

[PATCH v2 03/18] vfio/mdev: Add missing typesafety around mdev_device

[Jason Gunthorpe]

The mdev API should accept and pass a 'struct mdev_device *' in all
places, not pass a 'struct device *' and cast it internally with
to_mdev_device(). Particularly in its struct mdev_driver functions, the
whole point of a bus's struct device_driver wrapper is to provide type
safety compared to the default struct device_driver.

Further, the driver core standard is for bus drivers to expose their
device structure in their public headers that can be used with
container_of() inlines and '&foo->dev' to go between the class levels, and
'&foo->dev' to be used with dev_err/etc driver core helper functions. Move
'struct mdev_device' to mdev.h

Once done this allows moving some one instruction exported functions to
static inlines, which in turns allows removing one of the two grotesque
symbol_get()'s related to mdev in the core code.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 .../driver-api/vfio-mediated-device.rst       |  4 +-
 drivers/vfio/mdev/mdev_core.c                 | 64 ++-----------------
 drivers/vfio/mdev/mdev_driver.c               |  4 +-
 drivers/vfio/mdev/mdev_private.h              | 23 +------
 drivers/vfio/mdev/mdev_sysfs.c                | 26 ++++----
 drivers/vfio/mdev/vfio_mdev.c                 |  7 +-
 drivers/vfio/vfio_iommu_type1.c               | 25 ++------
 include/linux/mdev.h                          | 58 +++++++++++++----
 8 files changed, 83 insertions(+), 128 deletions(-)

diff --git a/Documentation/driver-api/vfio-mediated-device.rst b/Documentation/driver-api/vfio-mediated-device.rst
index 25eb7d5b834ba3..c43c1dc3333373 100644
--- a/Documentation/driver-api/vfio-mediated-device.rst
+++ b/Documentation/driver-api/vfio-mediated-device.rst
@@ -105,8 +105,8 @@ structure to represent a mediated device's driver::
       */
      struct mdev_driver {
 	     const char *name;
-	     int  (*probe)  (struct device *dev);
-	     void (*remove) (struct device *dev);
+	     int  (*probe)  (struct mdev_device *dev);
+	     void (*remove) (struct mdev_device *dev);
 	     struct device_driver    driver;
      };
 
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 6de97d25a3f87d..057922a1707e04 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -33,36 +33,6 @@ struct device *mdev_parent_dev(struct mdev_device *mdev)
 }
 EXPORT_SYMBOL(mdev_parent_dev);
 
-void *mdev_get_drvdata(struct mdev_device *mdev)
-{
-	return mdev->driver_data;
-}
-EXPORT_SYMBOL(mdev_get_drvdata);
-
-void mdev_set_drvdata(struct mdev_device *mdev, void *data)
-{
-	mdev->driver_data = data;
-}
-EXPORT_SYMBOL(mdev_set_drvdata);
-
-struct device *mdev_dev(struct mdev_device *mdev)
-{
-	return &mdev->dev;
-}
-EXPORT_SYMBOL(mdev_dev);
-
-struct mdev_device *mdev_from_dev(struct device *dev)
-{
-	return dev_is_mdev(dev) ? to_mdev_device(dev) : NULL;
-}
-EXPORT_SYMBOL(mdev_from_dev);
-
-const guid_t *mdev_uuid(struct mdev_device *mdev)
-{
-	return &mdev->uuid;
-}
-EXPORT_SYMBOL(mdev_uuid);
-
 /* Should be called holding parent_list_lock */
 static struct mdev_parent *__find_parent_device(struct device *dev)
 {
@@ -107,7 +77,7 @@ static void mdev_device_remove_common(struct mdev_device *mdev)
 	int ret;
 
 	type = to_mdev_type(mdev->type_kobj);
-	mdev_remove_sysfs_files(&mdev->dev, type);
+	mdev_remove_sysfs_files(mdev, type);
 	device_del(&mdev->dev);
 	parent = mdev->parent;
 	lockdep_assert_held(&parent->unreg_sem);
@@ -122,12 +92,10 @@ static void mdev_device_remove_common(struct mdev_device *mdev)
 
 static int mdev_device_remove_cb(struct device *dev, void *data)
 {
-	if (dev_is_mdev(dev)) {
-		struct mdev_device *mdev;
+	struct mdev_device *mdev = mdev_from_dev(dev);
 
-		mdev = to_mdev_device(dev);
+	if (mdev)
 		mdev_device_remove_common(mdev);
-	}
 	return 0;
 }
 
@@ -332,7 +300,7 @@ int mdev_device_create(struct kobject *kobj,
 	if (ret)
 		goto add_fail;
 
-	ret = mdev_create_sysfs_files(&mdev->dev, type);
+	ret = mdev_create_sysfs_files(mdev, type);
 	if (ret)
 		goto sysfs_fail;
 
@@ -354,13 +322,11 @@ int mdev_device_create(struct kobject *kobj,
 	return ret;
 }
 
-int mdev_device_remove(struct device *dev)
+int mdev_device_remove(struct mdev_device *mdev)
 {
-	struct mdev_device *mdev, *tmp;
+	struct mdev_device *tmp;
 	struct mdev_parent *parent;
 
-	mdev = to_mdev_device(dev);
-
 	mutex_lock(&mdev_list_lock);
 	list_for_each_entry(tmp, &mdev_list, next) {
 		if (tmp == mdev)
@@ -390,24 +356,6 @@ int mdev_device_remove(struct device *dev)
 	return 0;
 }
 
-int mdev_set_iommu_device(struct device *dev, struct device *iommu_device)
-{
-	struct mdev_device *mdev = to_mdev_device(dev);
-
-	mdev->iommu_device = iommu_device;
-
-	return 0;
-}
-EXPORT_SYMBOL(mdev_set_iommu_device);
-
-struct device *mdev_get_iommu_device(struct device *dev)
-{
-	struct mdev_device *mdev = to_mdev_device(dev);
-
-	return mdev->iommu_device;
-}
-EXPORT_SYMBOL(mdev_get_iommu_device);
-
 static int __init mdev_init(void)
 {
 	return mdev_bus_register();
diff --git a/drivers/vfio/mdev/mdev_driver.c b/drivers/vfio/mdev/mdev_driver.c
index 0d3223aee20b83..44c3ba7e56d923 100644
--- a/drivers/vfio/mdev/mdev_driver.c
+++ b/drivers/vfio/mdev/mdev_driver.c
@@ -48,7 +48,7 @@ static int mdev_probe(struct device *dev)
 		return ret;
 
 	if (drv && drv->probe) {
-		ret = drv->probe(dev);
+		ret = drv->probe(mdev);
 		if (ret)
 			mdev_detach_iommu(mdev);
 	}
@@ -62,7 +62,7 @@ static int mdev_remove(struct device *dev)
 	struct mdev_device *mdev = to_mdev_device(dev);
 
 	if (drv && drv->remove)
-		drv->remove(dev);
+		drv->remove(mdev);
 
 	mdev_detach_iommu(mdev);
 
diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h
index 74c2e541146999..bb60ec4a8d9d21 100644
--- a/drivers/vfio/mdev/mdev_private.h
+++ b/drivers/vfio/mdev/mdev_private.h
@@ -24,23 +24,6 @@ struct mdev_parent {
 	struct rw_semaphore unreg_sem;
 };
 
-struct mdev_device {
-	struct device dev;
-	struct mdev_parent *parent;
-	guid_t uuid;
-	void *driver_data;
-	struct list_head next;
-	struct kobject *type_kobj;
-	struct device *iommu_device;
-	bool active;
-};
-
-static inline struct mdev_device *to_mdev_device(struct device *dev)
-{
-	return container_of(dev, struct mdev_device, dev);
-}
-#define dev_is_mdev(d)		((d)->bus == &mdev_bus_type)
-
 struct mdev_type {
 	struct kobject kobj;
 	struct kobject *devices_kobj;
@@ -57,11 +40,11 @@ struct mdev_type {
 int  parent_create_sysfs_files(struct mdev_parent *parent);
 void parent_remove_sysfs_files(struct mdev_parent *parent);
 
-int  mdev_create_sysfs_files(struct device *dev, struct mdev_type *type);
-void mdev_remove_sysfs_files(struct device *dev, struct mdev_type *type);
+int  mdev_create_sysfs_files(struct mdev_device *mdev, struct mdev_type *type);
+void mdev_remove_sysfs_files(struct mdev_device *mdev, struct mdev_type *type);
 
 int  mdev_device_create(struct kobject *kobj,
 			struct device *dev, const guid_t *uuid);
-int  mdev_device_remove(struct device *dev);
+int  mdev_device_remove(struct mdev_device *dev);
 
 #endif /* MDEV_PRIVATE_H */
diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index 367ff5412a3879..18114f3e090a2a 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -225,6 +225,7 @@ int parent_create_sysfs_files(struct mdev_parent *parent)
 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
 			    const char *buf, size_t count)
 {
+	struct mdev_device *mdev = to_mdev_device(dev);
 	unsigned long val;
 
 	if (kstrtoul(buf, 0, &val) < 0)
@@ -233,7 +234,7 @@ static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
 	if (val && device_remove_file_self(dev, attr)) {
 		int ret;
 
-		ret = mdev_device_remove(dev);
+		ret = mdev_device_remove(mdev);
 		if (ret)
 			return ret;
 	}
@@ -248,34 +249,37 @@ static const struct attribute *mdev_device_attrs[] = {
 	NULL,
 };
 
-int  mdev_create_sysfs_files(struct device *dev, struct mdev_type *type)
+int mdev_create_sysfs_files(struct mdev_device *mdev, struct mdev_type *type)
 {
+	struct kobject *kobj = &mdev->dev.kobj;
 	int ret;
 
-	ret = sysfs_create_link(type->devices_kobj, &dev->kobj, dev_name(dev));
+	ret = sysfs_create_link(type->devices_kobj, kobj, dev_name(&mdev->dev));
 	if (ret)
 		return ret;
 
-	ret = sysfs_create_link(&dev->kobj, &type->kobj, "mdev_type");
+	ret = sysfs_create_link(kobj, &type->kobj, "mdev_type");
 	if (ret)
 		goto type_link_failed;
 
-	ret = sysfs_create_files(&dev->kobj, mdev_device_attrs);
+	ret = sysfs_create_files(kobj, mdev_device_attrs);
 	if (ret)
 		goto create_files_failed;
 
 	return ret;
 
 create_files_failed:
-	sysfs_remove_link(&dev->kobj, "mdev_type");
+	sysfs_remove_link(kobj, "mdev_type");
 type_link_failed:
-	sysfs_remove_link(type->devices_kobj, dev_name(dev));
+	sysfs_remove_link(type->devices_kobj, dev_name(&mdev->dev));
 	return ret;
 }
 
-void mdev_remove_sysfs_files(struct device *dev, struct mdev_type *type)
+void mdev_remove_sysfs_files(struct mdev_device *mdev, struct mdev_type *type)
 {
-	sysfs_remove_files(&dev->kobj, mdev_device_attrs);
-	sysfs_remove_link(&dev->kobj, "mdev_type");
-	sysfs_remove_link(type->devices_kobj, dev_name(dev));
+	struct kobject *kobj = &mdev->dev.kobj;
+
+	sysfs_remove_files(kobj, mdev_device_attrs);
+	sysfs_remove_link(kobj, "mdev_type");
+	sysfs_remove_link(type->devices_kobj, dev_name(&mdev->dev));
 }
diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c
index ae7e322fbe3c26..91b7b8b9eb9cb8 100644
--- a/drivers/vfio/mdev/vfio_mdev.c
+++ b/drivers/vfio/mdev/vfio_mdev.c
@@ -124,9 +124,8 @@ static const struct vfio_device_ops vfio_mdev_dev_ops = {
 	.request	= vfio_mdev_request,
 };
 
-static int vfio_mdev_probe(struct device *dev)
+static int vfio_mdev_probe(struct mdev_device *mdev)
 {
-	struct mdev_device *mdev = to_mdev_device(dev);
 	struct vfio_device *vdev;
 	int ret;
 
@@ -144,9 +143,9 @@ static int vfio_mdev_probe(struct device *dev)
 	return 0;
 }
 
-static void vfio_mdev_remove(struct device *dev)
+static void vfio_mdev_remove(struct mdev_device *mdev)
 {
-	struct vfio_device *vdev = dev_get_drvdata(dev);
+	struct vfio_device *vdev = dev_get_drvdata(&mdev->dev);
 
 	vfio_unregister_group_dev(vdev);
 	kfree(vdev);
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index be444407664af7..51749b73075885 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1927,28 +1927,13 @@ static bool vfio_iommu_has_sw_msi(struct list_head *group_resv_regions,
 	return ret;
 }
 
-static struct device *vfio_mdev_get_iommu_device(struct device *dev)
-{
-	struct device *(*fn)(struct device *dev);
-	struct device *iommu_device;
-
-	fn = symbol_get(mdev_get_iommu_device);
-	if (fn) {
-		iommu_device = fn(dev);
-		symbol_put(mdev_get_iommu_device);
-
-		return iommu_device;
-	}
-
-	return NULL;
-}
-
 static int vfio_mdev_attach_domain(struct device *dev, void *data)
 {
+	struct mdev_device *mdev = to_mdev_device(dev);
 	struct iommu_domain *domain = data;
 	struct device *iommu_device;
 
-	iommu_device = vfio_mdev_get_iommu_device(dev);
+	iommu_device = mdev_get_iommu_device(mdev);
 	if (iommu_device) {
 		if (iommu_dev_feature_enabled(iommu_device, IOMMU_DEV_FEAT_AUX))
 			return iommu_aux_attach_device(domain, iommu_device);
@@ -1961,10 +1946,11 @@ static int vfio_mdev_attach_domain(struct device *dev, void *data)
 
 static int vfio_mdev_detach_domain(struct device *dev, void *data)
 {
+	struct mdev_device *mdev = to_mdev_device(dev);
 	struct iommu_domain *domain = data;
 	struct device *iommu_device;
 
-	iommu_device = vfio_mdev_get_iommu_device(dev);
+	iommu_device = mdev_get_iommu_device(mdev);
 	if (iommu_device) {
 		if (iommu_dev_feature_enabled(iommu_device, IOMMU_DEV_FEAT_AUX))
 			iommu_aux_detach_device(domain, iommu_device);
@@ -2012,9 +1998,10 @@ static bool vfio_bus_is_mdev(struct bus_type *bus)
 
 static int vfio_mdev_iommu_device(struct device *dev, void *data)
 {
+	struct mdev_device *mdev = to_mdev_device(dev);
 	struct device **old = data, *new;
 
-	new = vfio_mdev_get_iommu_device(dev);
+	new = mdev_get_iommu_device(mdev);
 	if (!new || (*old && *old != new))
 		return -EINVAL;
 
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index 27eb383cb95de0..52f7ea19dd0f56 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -10,7 +10,21 @@
 #ifndef MDEV_H
 #define MDEV_H
 
-struct mdev_device;
+struct mdev_device {
+	struct device dev;
+	struct mdev_parent *parent;
+	guid_t uuid;
+	void *driver_data;
+	struct list_head next;
+	struct kobject *type_kobj;
+	struct device *iommu_device;
+	bool active;
+};
+
+static inline struct mdev_device *to_mdev_device(struct device *dev)
+{
+	return container_of(dev, struct mdev_device, dev);
+}
 
 /*
  * Called by the parent device driver to set the device which represents
@@ -19,12 +33,17 @@ struct mdev_device;
  *
  * @dev: the mediated device that iommu will isolate.
  * @iommu_device: a pci device which represents the iommu for @dev.
- *
- * Return 0 for success, otherwise negative error value.
  */
-int mdev_set_iommu_device(struct device *dev, struct device *iommu_device);
+static inline void mdev_set_iommu_device(struct mdev_device *mdev,
+					 struct device *iommu_device)
+{
+	mdev->iommu_device = iommu_device;
+}
 
-struct device *mdev_get_iommu_device(struct device *dev);
+static inline struct device *mdev_get_iommu_device(struct mdev_device *mdev)
+{
+	return mdev->iommu_device;
+}
 
 /**
  * struct mdev_parent_ops - Structure to be registered for each parent device to
@@ -126,16 +145,25 @@ struct mdev_type_attribute mdev_type_attr_##_name =		\
  **/
 struct mdev_driver {
 	const char *name;
-	int  (*probe)(struct device *dev);
-	void (*remove)(struct device *dev);
+	int (*probe)(struct mdev_device *dev);
+	void (*remove)(struct mdev_device *dev);
 	struct device_driver driver;
 };
 
 #define to_mdev_driver(drv)	container_of(drv, struct mdev_driver, driver)
 
-void *mdev_get_drvdata(struct mdev_device *mdev);
-void mdev_set_drvdata(struct mdev_device *mdev, void *data);
-const guid_t *mdev_uuid(struct mdev_device *mdev);
+static inline void *mdev_get_drvdata(struct mdev_device *mdev)
+{
+	return mdev->driver_data;
+}
+static inline void mdev_set_drvdata(struct mdev_device *mdev, void *data)
+{
+	mdev->driver_data = data;
+}
+static inline const guid_t *mdev_uuid(struct mdev_device *mdev)
+{
+	return &mdev->uuid;
+}
 
 extern struct bus_type mdev_bus_type;
 
@@ -146,7 +174,13 @@ int mdev_register_driver(struct mdev_driver *drv, struct module *owner);
 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);
+static inline struct device *mdev_dev(struct mdev_device *mdev)
+{
+	return &mdev->dev;
+}
+static inline struct mdev_device *mdev_from_dev(struct device *dev)
+{
+	return dev->bus == &mdev_bus_type ? to_mdev_device(dev) : NULL;
+}
 
 #endif /* MDEV_H */
-- 
2.31.1

Re: [PATCH v2 03/18] vfio/mdev: Add missing typesafety around mdev_device

[Christoph Hellwig]

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

[PATCH v2 04/18] vfio/mdev: Simplify driver registration

[Jason Gunthorpe]

This is only done once, we don't need to generate code to initialize a
structure stored in the ELF .data segment. Fill in the three required
.driver members directly instead of copying data into them during
mdev_register_driver().

Further the to_mdev_driver() function doesn't belong in a public header,
just inline it into the two places that need it. Finally, we can now
clearly see that 'drv' derived from dev->driver cannot be NULL, firstly
because the driver core forbids it, and secondly because NULL won't pass
through the container_of(). Remove the dead code.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 Documentation/driver-api/vfio-mediated-device.rst |  5 +----
 drivers/vfio/mdev/mdev_driver.c                   | 15 +++++++--------
 drivers/vfio/mdev/vfio_mdev.c                     |  8 ++++++--
 include/linux/mdev.h                              |  6 +-----
 4 files changed, 15 insertions(+), 19 deletions(-)

diff --git a/Documentation/driver-api/vfio-mediated-device.rst b/Documentation/driver-api/vfio-mediated-device.rst
index c43c1dc3333373..1779b85f014e2f 100644
--- a/Documentation/driver-api/vfio-mediated-device.rst
+++ b/Documentation/driver-api/vfio-mediated-device.rst
@@ -98,13 +98,11 @@ structure to represent a mediated device's driver::
 
      /*
       * struct mdev_driver [2] - Mediated device's driver
-      * @name: driver name
       * @probe: called when new device created
       * @remove: called when device removed
       * @driver: device driver structure
       */
      struct mdev_driver {
-	     const char *name;
 	     int  (*probe)  (struct mdev_device *dev);
 	     void (*remove) (struct mdev_device *dev);
 	     struct device_driver    driver;
@@ -115,8 +113,7 @@ to register and unregister itself with the core driver:
 
 * Register::
 
-    extern int  mdev_register_driver(struct mdev_driver *drv,
-				   struct module *owner);
+    extern int  mdev_register_driver(struct mdev_driver *drv);
 
 * Unregister::
 
diff --git a/drivers/vfio/mdev/mdev_driver.c b/drivers/vfio/mdev/mdev_driver.c
index 44c3ba7e56d923..041699571b7e55 100644
--- a/drivers/vfio/mdev/mdev_driver.c
+++ b/drivers/vfio/mdev/mdev_driver.c
@@ -39,7 +39,8 @@ static void mdev_detach_iommu(struct mdev_device *mdev)
 
 static int mdev_probe(struct device *dev)
 {
-	struct mdev_driver *drv = to_mdev_driver(dev->driver);
+	struct mdev_driver *drv =
+		container_of(dev->driver, struct mdev_driver, driver);
 	struct mdev_device *mdev = to_mdev_device(dev);
 	int ret;
 
@@ -47,7 +48,7 @@ static int mdev_probe(struct device *dev)
 	if (ret)
 		return ret;
 
-	if (drv && drv->probe) {
+	if (drv->probe) {
 		ret = drv->probe(mdev);
 		if (ret)
 			mdev_detach_iommu(mdev);
@@ -58,10 +59,11 @@ static int mdev_probe(struct device *dev)
 
 static int mdev_remove(struct device *dev)
 {
-	struct mdev_driver *drv = to_mdev_driver(dev->driver);
+	struct mdev_driver *drv =
+		container_of(dev->driver, struct mdev_driver, driver);
 	struct mdev_device *mdev = to_mdev_device(dev);
 
-	if (drv && drv->remove)
+	if (drv->remove)
 		drv->remove(mdev);
 
 	mdev_detach_iommu(mdev);
@@ -79,16 +81,13 @@ EXPORT_SYMBOL_GPL(mdev_bus_type);
 /**
  * mdev_register_driver - register a new MDEV driver
  * @drv: the driver to register
- * @owner: module owner of driver to be registered
  *
  * Returns a negative value on error, otherwise 0.
  **/
-int mdev_register_driver(struct mdev_driver *drv, struct module *owner)
+int mdev_register_driver(struct mdev_driver *drv)
 {
 	/* initialize common driver fields */
-	drv->driver.name = drv->name;
 	drv->driver.bus = &mdev_bus_type;
-	drv->driver.owner = owner;
 
 	/* register with core */
 	return driver_register(&drv->driver);
diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c
index 91b7b8b9eb9cb8..cc9507ed85a181 100644
--- a/drivers/vfio/mdev/vfio_mdev.c
+++ b/drivers/vfio/mdev/vfio_mdev.c
@@ -152,14 +152,18 @@ static void vfio_mdev_remove(struct mdev_device *mdev)
 }
 
 static struct mdev_driver vfio_mdev_driver = {
-	.name	= "vfio_mdev",
+	.driver = {
+		.name = "vfio_mdev",
+		.owner = THIS_MODULE,
+		.mod_name = KBUILD_MODNAME,
+	},
 	.probe	= vfio_mdev_probe,
 	.remove	= vfio_mdev_remove,
 };
 
 static int __init vfio_mdev_init(void)
 {
-	return mdev_register_driver(&vfio_mdev_driver, THIS_MODULE);
+	return mdev_register_driver(&vfio_mdev_driver);
 }
 
 static void __exit vfio_mdev_exit(void)
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index 52f7ea19dd0f56..cb771c712da0f4 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -137,21 +137,17 @@ struct mdev_type_attribute mdev_type_attr_##_name =		\
 
 /**
  * struct mdev_driver - Mediated device driver
- * @name: driver name
  * @probe: called when new device created
  * @remove: called when device removed
  * @driver: device driver structure
  *
  **/
 struct mdev_driver {
-	const char *name;
 	int (*probe)(struct mdev_device *dev);
 	void (*remove)(struct mdev_device *dev);
 	struct device_driver driver;
 };
 
-#define to_mdev_driver(drv)	container_of(drv, struct mdev_driver, driver)
-
 static inline void *mdev_get_drvdata(struct mdev_device *mdev)
 {
 	return mdev->driver_data;
@@ -170,7 +166,7 @@ extern struct bus_type mdev_bus_type;
 int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops);
 void mdev_unregister_device(struct device *dev);
 
-int mdev_register_driver(struct mdev_driver *drv, struct module *owner);
+int mdev_register_driver(struct mdev_driver *drv);
 void mdev_unregister_driver(struct mdev_driver *drv);
 
 struct device *mdev_parent_dev(struct mdev_device *mdev);
-- 
2.31.1

[PATCH v2 05/18] vfio/mdev: Use struct mdev_type in struct mdev_device

[Jason Gunthorpe]

The kobj pointer in mdev_device is actually pointing at a struct
mdev_type. Use the proper type so things are understandable.

There are a number of places that are confused and passing both the mdev
and the mtype as function arguments, fix these to derive the mtype
directly from the mdev to remove the redundancy.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/vfio/mdev/mdev_core.c    | 16 ++++++----------
 drivers/vfio/mdev/mdev_private.h |  7 +++----
 drivers/vfio/mdev/mdev_sysfs.c   | 11 ++++++-----
 include/linux/mdev.h             |  4 +++-
 4 files changed, 18 insertions(+), 20 deletions(-)

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 057922a1707e04..5ca0efa5266bad 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -73,11 +73,9 @@ static void mdev_put_parent(struct mdev_parent *parent)
 static void mdev_device_remove_common(struct mdev_device *mdev)
 {
 	struct mdev_parent *parent;
-	struct mdev_type *type;
 	int ret;
 
-	type = to_mdev_type(mdev->type_kobj);
-	mdev_remove_sysfs_files(mdev, type);
+	mdev_remove_sysfs_files(mdev);
 	device_del(&mdev->dev);
 	parent = mdev->parent;
 	lockdep_assert_held(&parent->unreg_sem);
@@ -241,13 +239,11 @@ static void mdev_device_release(struct device *dev)
 	mdev_device_free(mdev);
 }
 
-int mdev_device_create(struct kobject *kobj,
-		       struct device *dev, const guid_t *uuid)
+int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 {
 	int ret;
 	struct mdev_device *mdev, *tmp;
 	struct mdev_parent *parent;
-	struct mdev_type *type = to_mdev_type(kobj);
 
 	parent = mdev_get_parent(type->parent);
 	if (!parent)
@@ -285,14 +281,14 @@ int mdev_device_create(struct kobject *kobj,
 	}
 
 	device_initialize(&mdev->dev);
-	mdev->dev.parent  = dev;
+	mdev->dev.parent = parent->dev;
 	mdev->dev.bus     = &mdev_bus_type;
 	mdev->dev.release = mdev_device_release;
 	dev_set_name(&mdev->dev, "%pUl", uuid);
 	mdev->dev.groups = parent->ops->mdev_attr_groups;
-	mdev->type_kobj = kobj;
+	mdev->type = type;
 
-	ret = parent->ops->create(kobj, mdev);
+	ret = parent->ops->create(&type->kobj, mdev);
 	if (ret)
 		goto ops_create_fail;
 
@@ -300,7 +296,7 @@ int mdev_device_create(struct kobject *kobj,
 	if (ret)
 		goto add_fail;
 
-	ret = mdev_create_sysfs_files(mdev, type);
+	ret = mdev_create_sysfs_files(mdev);
 	if (ret)
 		goto sysfs_fail;
 
diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h
index bb60ec4a8d9d21..debf27f95b4f10 100644
--- a/drivers/vfio/mdev/mdev_private.h
+++ b/drivers/vfio/mdev/mdev_private.h
@@ -40,11 +40,10 @@ struct mdev_type {
 int  parent_create_sysfs_files(struct mdev_parent *parent);
 void parent_remove_sysfs_files(struct mdev_parent *parent);
 
-int  mdev_create_sysfs_files(struct mdev_device *mdev, struct mdev_type *type);
-void mdev_remove_sysfs_files(struct mdev_device *mdev, struct mdev_type *type);
+int  mdev_create_sysfs_files(struct mdev_device *mdev);
+void mdev_remove_sysfs_files(struct mdev_device *mdev);
 
-int  mdev_device_create(struct kobject *kobj,
-			struct device *dev, const guid_t *uuid);
+int mdev_device_create(struct mdev_type *kobj, const guid_t *uuid);
 int  mdev_device_remove(struct mdev_device *dev);
 
 #endif /* MDEV_PRIVATE_H */
diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index 18114f3e090a2a..bcfe48d56e8a9e 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -67,7 +67,7 @@ static ssize_t create_store(struct kobject *kobj, struct device *dev,
 	if (ret)
 		return ret;
 
-	ret = mdev_device_create(kobj, dev, &uuid);
+	ret = mdev_device_create(to_mdev_type(kobj), &uuid);
 	if (ret)
 		return ret;
 
@@ -249,8 +249,9 @@ static const struct attribute *mdev_device_attrs[] = {
 	NULL,
 };
 
-int mdev_create_sysfs_files(struct mdev_device *mdev, struct mdev_type *type)
+int mdev_create_sysfs_files(struct mdev_device *mdev)
 {
+	struct mdev_type *type = mdev->type;
 	struct kobject *kobj = &mdev->dev.kobj;
 	int ret;
 
@@ -271,15 +272,15 @@ int mdev_create_sysfs_files(struct mdev_device *mdev, struct mdev_type *type)
 create_files_failed:
 	sysfs_remove_link(kobj, "mdev_type");
 type_link_failed:
-	sysfs_remove_link(type->devices_kobj, dev_name(&mdev->dev));
+	sysfs_remove_link(mdev->type->devices_kobj, dev_name(&mdev->dev));
 	return ret;
 }
 
-void mdev_remove_sysfs_files(struct mdev_device *mdev, struct mdev_type *type)
+void mdev_remove_sysfs_files(struct mdev_device *mdev)
 {
 	struct kobject *kobj = &mdev->dev.kobj;
 
 	sysfs_remove_files(kobj, mdev_device_attrs);
 	sysfs_remove_link(kobj, "mdev_type");
-	sysfs_remove_link(type->devices_kobj, dev_name(&mdev->dev));
+	sysfs_remove_link(mdev->type->devices_kobj, dev_name(&mdev->dev));
 }
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index cb771c712da0f4..349e8ac1fe3382 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -10,13 +10,15 @@
 #ifndef MDEV_H
 #define MDEV_H
 
+struct mdev_type;
+
 struct mdev_device {
 	struct device dev;
 	struct mdev_parent *parent;
 	guid_t uuid;
 	void *driver_data;
 	struct list_head next;
-	struct kobject *type_kobj;
+	struct mdev_type *type;
 	struct device *iommu_device;
 	bool active;
 };
-- 
2.31.1

[PATCH v2 06/18] vfio/mdev: Expose mdev_get/put_parent to mdev_private.h

[Jason Gunthorpe]

The next patch will use these in mdev_sysfs.c

While here remove the now dead code checks for NULL, a mdev_type can never
have a NULL parent.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/vfio/mdev/mdev_core.c    | 23 +++--------------------
 drivers/vfio/mdev/mdev_private.h | 12 ++++++++++++
 2 files changed, 15 insertions(+), 20 deletions(-)

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 5ca0efa5266bad..7ec21c907397a5 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -45,7 +45,7 @@ static struct mdev_parent *__find_parent_device(struct device *dev)
 	return NULL;
 }
 
-static void mdev_release_parent(struct kref *kref)
+void mdev_release_parent(struct kref *kref)
 {
 	struct mdev_parent *parent = container_of(kref, struct mdev_parent,
 						  ref);
@@ -55,20 +55,6 @@ static void mdev_release_parent(struct kref *kref)
 	put_device(dev);
 }
 
-static struct mdev_parent *mdev_get_parent(struct mdev_parent *parent)
-{
-	if (parent)
-		kref_get(&parent->ref);
-
-	return parent;
-}
-
-static void mdev_put_parent(struct mdev_parent *parent)
-{
-	if (parent)
-		kref_put(&parent->ref, mdev_release_parent);
-}
-
 /* Caller must hold parent unreg_sem read or write lock */
 static void mdev_device_remove_common(struct mdev_device *mdev)
 {
@@ -243,12 +229,9 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 {
 	int ret;
 	struct mdev_device *mdev, *tmp;
-	struct mdev_parent *parent;
-
-	parent = mdev_get_parent(type->parent);
-	if (!parent)
-		return -EINVAL;
+	struct mdev_parent *parent = type->parent;
 
+	mdev_get_parent(parent);
 	mutex_lock(&mdev_list_lock);
 
 	/* Check for duplicate */
diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h
index debf27f95b4f10..10eccc35782c4d 100644
--- a/drivers/vfio/mdev/mdev_private.h
+++ b/drivers/vfio/mdev/mdev_private.h
@@ -46,4 +46,16 @@ void mdev_remove_sysfs_files(struct mdev_device *mdev);
 int mdev_device_create(struct mdev_type *kobj, const guid_t *uuid);
 int  mdev_device_remove(struct mdev_device *dev);
 
+void mdev_release_parent(struct kref *kref);
+
+static inline void mdev_get_parent(struct mdev_parent *parent)
+{
+	kref_get(&parent->ref);
+}
+
+static inline void mdev_put_parent(struct mdev_parent *parent)
+{
+	kref_put(&parent->ref, mdev_release_parent);
+}
+
 #endif /* MDEV_PRIVATE_H */
-- 
2.31.1

[PATCH v2 07/18] vfio/mdev: Add missing reference counting to mdev_type

[Jason Gunthorpe]

struct mdev_type holds a pointer to the kref'd object struct mdev_parent,
but doesn't hold the kref. The lifetime of the parent becomes implicit
because parent_remove_sysfs_files() is supposed to remove all the access
before the parent can be freed, but this is very hard to reason about.

Make it obviously correct by adding the missing get.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/vfio/mdev/mdev_sysfs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index bcfe48d56e8a9e..8c169d12ba7dbb 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -81,6 +81,8 @@ static void mdev_type_release(struct kobject *kobj)
 	struct mdev_type *type = to_mdev_type(kobj);
 
 	pr_debug("Releasing group %s\n", kobj->name);
+	/* Pairs with the get in add_mdev_supported_type() */
+	mdev_put_parent(type->parent);
 	kfree(type);
 }
 
@@ -106,6 +108,8 @@ static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
 
 	type->kobj.kset = parent->mdev_types_kset;
 	type->parent = parent;
+	/* Pairs with the put in mdev_type_release() */
+	mdev_get_parent(parent);
 
 	ret = kobject_init_and_add(&type->kobj, &mdev_type_ktype, NULL,
 				   "%s-%s", dev_driver_string(parent->dev),
-- 
2.31.1

[PATCH v2 08/18] vfio/mdev: Reorganize mdev_device_create()

[Jason Gunthorpe]

Once the memory for the struct mdev_device is allocated it should
immediately be device_initialize()'d and filled in so that put_device()
can always be used to undo the allocation.

Place the mdev_get/put_parent() so that they are clearly protecting the
mdev->parent pointer. Move the final put to the release function so that
the lifetime rules are trivial to understand. Update the goto labels to
follow the normal convention.

Remove mdev_device_free() as the release function via device_put() is now
usable in all cases.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/vfio/mdev/mdev_core.c | 60 ++++++++++++++++-------------------
 1 file changed, 27 insertions(+), 33 deletions(-)

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 7ec21c907397a5..f7559835b0610f 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -71,7 +71,6 @@ static void mdev_device_remove_common(struct mdev_device *mdev)
 
 	/* Balances with device_initialize() */
 	put_device(&mdev->dev);
-	mdev_put_parent(parent);
 }
 
 static int mdev_device_remove_cb(struct device *dev, void *data)
@@ -208,8 +207,13 @@ void mdev_unregister_device(struct device *dev)
 }
 EXPORT_SYMBOL(mdev_unregister_device);
 
-static void mdev_device_free(struct mdev_device *mdev)
+static void mdev_device_release(struct device *dev)
 {
+	struct mdev_device *mdev = to_mdev_device(dev);
+
+	/* Pairs with the get in mdev_device_create() */
+	mdev_put_parent(mdev->parent);
+
 	mutex_lock(&mdev_list_lock);
 	list_del(&mdev->next);
 	mutex_unlock(&mdev_list_lock);
@@ -218,70 +222,61 @@ static void mdev_device_free(struct mdev_device *mdev)
 	kfree(mdev);
 }
 
-static void mdev_device_release(struct device *dev)
-{
-	struct mdev_device *mdev = to_mdev_device(dev);
-
-	mdev_device_free(mdev);
-}
-
 int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 {
 	int ret;
 	struct mdev_device *mdev, *tmp;
 	struct mdev_parent *parent = type->parent;
 
-	mdev_get_parent(parent);
 	mutex_lock(&mdev_list_lock);
 
 	/* Check for duplicate */
 	list_for_each_entry(tmp, &mdev_list, next) {
 		if (guid_equal(&tmp->uuid, uuid)) {
 			mutex_unlock(&mdev_list_lock);
-			ret = -EEXIST;
-			goto mdev_fail;
+			return -EEXIST;
 		}
 	}
 
 	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
 	if (!mdev) {
 		mutex_unlock(&mdev_list_lock);
-		ret = -ENOMEM;
-		goto mdev_fail;
+		return -ENOMEM;
 	}
 
+	device_initialize(&mdev->dev);
+	mdev->dev.parent  = parent->dev;
+	mdev->dev.bus = &mdev_bus_type;
+	mdev->dev.release = mdev_device_release;
+	mdev->dev.groups = parent->ops->mdev_attr_groups;
+	mdev->type = type;
+	mdev->parent = parent;
+	/* Pairs with the put in mdev_device_release() */
+	mdev_get_parent(parent);
+
 	guid_copy(&mdev->uuid, uuid);
 	list_add(&mdev->next, &mdev_list);
 	mutex_unlock(&mdev_list_lock);
 
-	mdev->parent = parent;
+	dev_set_name(&mdev->dev, "%pUl", uuid);
 
 	/* Check if parent unregistration has started */
 	if (!down_read_trylock(&parent->unreg_sem)) {
-		mdev_device_free(mdev);
 		ret = -ENODEV;
-		goto mdev_fail;
+		goto out_put_device;
 	}
 
-	device_initialize(&mdev->dev);
-	mdev->dev.parent = parent->dev;
-	mdev->dev.bus     = &mdev_bus_type;
-	mdev->dev.release = mdev_device_release;
-	dev_set_name(&mdev->dev, "%pUl", uuid);
-	mdev->dev.groups = parent->ops->mdev_attr_groups;
-	mdev->type = type;
-
 	ret = parent->ops->create(&type->kobj, mdev);
 	if (ret)
-		goto ops_create_fail;
+		goto out_unlock;
 
 	ret = device_add(&mdev->dev);
 	if (ret)
-		goto add_fail;
+		goto out_remove;
 
 	ret = mdev_create_sysfs_files(mdev);
 	if (ret)
-		goto sysfs_fail;
+		goto out_del;
 
 	mdev->active = true;
 	dev_dbg(&mdev->dev, "MDEV: created\n");
@@ -289,15 +284,14 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 
 	return 0;
 
-sysfs_fail:
+out_del:
 	device_del(&mdev->dev);
-add_fail:
+out_remove:
 	parent->ops->remove(mdev);
-ops_create_fail:
+out_unlock:
 	up_read(&parent->unreg_sem);
+out_put_device:
 	put_device(&mdev->dev);
-mdev_fail:
-	mdev_put_parent(parent);
 	return ret;
 }
 
-- 
2.31.1

[PATCH v2 09/18] vfio/mdev: Add missing error handling to dev_set_name()

[Jason Gunthorpe]

This can fail, and seems to be a popular target for syzkaller error
injection. Check the error return and unwind with put_device().

Fixes: 7b96953bc640 ("vfio: Mediated device Core driver")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/vfio/mdev/mdev_core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index f7559835b0610f..4caedb3d4fbf32 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -258,7 +258,9 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 	list_add(&mdev->next, &mdev_list);
 	mutex_unlock(&mdev_list_lock);
 
-	dev_set_name(&mdev->dev, "%pUl", uuid);
+	ret = dev_set_name(&mdev->dev, "%pUl", uuid);
+	if (ret)
+		goto out_put_device;
 
 	/* Check if parent unregistration has started */
 	if (!down_read_trylock(&parent->unreg_sem)) {
-- 
2.31.1

[PATCH v2 10/18] vfio/mdev: Remove duplicate storage of parent in mdev_device

[Jason Gunthorpe]

mdev_device->type->parent is the same thing.

The struct mdev_device was relying on the kref on the mdev_parent to also
indirectly hold a kref on the mdev_type pointer. Now that the type holds a
kref on the parent we can directly kref the mdev_type and remove this
implicit relationship.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/vfio/mdev/mdev_core.c | 13 +++++--------
 drivers/vfio/mdev/vfio_mdev.c | 14 +++++++-------
 include/linux/mdev.h          |  1 -
 3 files changed, 12 insertions(+), 16 deletions(-)

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 4caedb3d4fbf32..2a20bdaf614214 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -29,7 +29,7 @@ static DEFINE_MUTEX(mdev_list_lock);
 
 struct device *mdev_parent_dev(struct mdev_device *mdev)
 {
-	return mdev->parent->dev;
+	return mdev->type->parent->dev;
 }
 EXPORT_SYMBOL(mdev_parent_dev);
 
@@ -58,12 +58,11 @@ void mdev_release_parent(struct kref *kref)
 /* Caller must hold parent unreg_sem read or write lock */
 static void mdev_device_remove_common(struct mdev_device *mdev)
 {
-	struct mdev_parent *parent;
+	struct mdev_parent *parent = mdev->type->parent;
 	int ret;
 
 	mdev_remove_sysfs_files(mdev);
 	device_del(&mdev->dev);
-	parent = mdev->parent;
 	lockdep_assert_held(&parent->unreg_sem);
 	ret = parent->ops->remove(mdev);
 	if (ret)
@@ -212,7 +211,7 @@ static void mdev_device_release(struct device *dev)
 	struct mdev_device *mdev = to_mdev_device(dev);
 
 	/* Pairs with the get in mdev_device_create() */
-	mdev_put_parent(mdev->parent);
+	kobject_put(&mdev->type->kobj);
 
 	mutex_lock(&mdev_list_lock);
 	list_del(&mdev->next);
@@ -250,9 +249,8 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 	mdev->dev.release = mdev_device_release;
 	mdev->dev.groups = parent->ops->mdev_attr_groups;
 	mdev->type = type;
-	mdev->parent = parent;
 	/* Pairs with the put in mdev_device_release() */
-	mdev_get_parent(parent);
+	kobject_get(&type->kobj);
 
 	guid_copy(&mdev->uuid, uuid);
 	list_add(&mdev->next, &mdev_list);
@@ -300,7 +298,7 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 int mdev_device_remove(struct mdev_device *mdev)
 {
 	struct mdev_device *tmp;
-	struct mdev_parent *parent;
+	struct mdev_parent *parent = mdev->type->parent;
 
 	mutex_lock(&mdev_list_lock);
 	list_for_each_entry(tmp, &mdev_list, next) {
@@ -321,7 +319,6 @@ int mdev_device_remove(struct mdev_device *mdev)
 	mdev->active = false;
 	mutex_unlock(&mdev_list_lock);
 
-	parent = mdev->parent;
 	/* Check if parent unregistration has started */
 	if (!down_read_trylock(&parent->unreg_sem))
 		return -ENODEV;
diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c
index cc9507ed85a181..922729071c5a8e 100644
--- a/drivers/vfio/mdev/vfio_mdev.c
+++ b/drivers/vfio/mdev/vfio_mdev.c
@@ -24,7 +24,7 @@
 static int vfio_mdev_open(struct vfio_device *core_vdev)
 {
 	struct mdev_device *mdev = to_mdev_device(core_vdev->dev);
-	struct mdev_parent *parent = mdev->parent;
+	struct mdev_parent *parent = mdev->type->parent;
 
 	int ret;
 
@@ -44,7 +44,7 @@ static int vfio_mdev_open(struct vfio_device *core_vdev)
 static void vfio_mdev_release(struct vfio_device *core_vdev)
 {
 	struct mdev_device *mdev = to_mdev_device(core_vdev->dev);
-	struct mdev_parent *parent = mdev->parent;
+	struct mdev_parent *parent = mdev->type->parent;
 
 	if (likely(parent->ops->release))
 		parent->ops->release(mdev);
@@ -56,7 +56,7 @@ static long vfio_mdev_unlocked_ioctl(struct vfio_device *core_vdev,
 				     unsigned int cmd, unsigned long arg)
 {
 	struct mdev_device *mdev = to_mdev_device(core_vdev->dev);
-	struct mdev_parent *parent = mdev->parent;
+	struct mdev_parent *parent = mdev->type->parent;
 
 	if (unlikely(!parent->ops->ioctl))
 		return -EINVAL;
@@ -68,7 +68,7 @@ static ssize_t vfio_mdev_read(struct vfio_device *core_vdev, char __user *buf,
 			      size_t count, loff_t *ppos)
 {
 	struct mdev_device *mdev = to_mdev_device(core_vdev->dev);
-	struct mdev_parent *parent = mdev->parent;
+	struct mdev_parent *parent = mdev->type->parent;
 
 	if (unlikely(!parent->ops->read))
 		return -EINVAL;
@@ -81,7 +81,7 @@ static ssize_t vfio_mdev_write(struct vfio_device *core_vdev,
 			       loff_t *ppos)
 {
 	struct mdev_device *mdev = to_mdev_device(core_vdev->dev);
-	struct mdev_parent *parent = mdev->parent;
+	struct mdev_parent *parent = mdev->type->parent;
 
 	if (unlikely(!parent->ops->write))
 		return -EINVAL;
@@ -93,7 +93,7 @@ static int vfio_mdev_mmap(struct vfio_device *core_vdev,
 			  struct vm_area_struct *vma)
 {
 	struct mdev_device *mdev = to_mdev_device(core_vdev->dev);
-	struct mdev_parent *parent = mdev->parent;
+	struct mdev_parent *parent = mdev->type->parent;
 
 	if (unlikely(!parent->ops->mmap))
 		return -EINVAL;
@@ -104,7 +104,7 @@ static int vfio_mdev_mmap(struct vfio_device *core_vdev,
 static void vfio_mdev_request(struct vfio_device *core_vdev, unsigned int count)
 {
 	struct mdev_device *mdev = to_mdev_device(core_vdev->dev);
-	struct mdev_parent *parent = mdev->parent;
+	struct mdev_parent *parent = mdev->type->parent;
 
 	if (parent->ops->request)
 		parent->ops->request(mdev, count);
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index 349e8ac1fe3382..fb582adda28a9b 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -14,7 +14,6 @@ struct mdev_type;
 
 struct mdev_device {
 	struct device dev;
-	struct mdev_parent *parent;
 	guid_t uuid;
 	void *driver_data;
 	struct list_head next;
-- 
2.31.1

[PATCH v2 11/18] vfio/mdev: Add mdev/mtype_get_type_group_id()

[Jason Gunthorpe]

This returns the index in the supported_type_groups array that is
associated with the mdev_type attached to the struct mdev_device or its
containing struct kobject.

Each mdev_device can be spawned from exactly one mdev_type, which in turn
originates from exactly one supported_type_group.

Drivers are using weird string calculations to try and get back to this
index, providing a direct access to the index removes a bunch of wonky
driver code.

mdev_type->group can be deleted as the group is obtained using the
type_group_id.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/vfio/mdev/mdev_core.c    | 20 ++++++++++++++++++++
 drivers/vfio/mdev/mdev_private.h |  2 +-
 drivers/vfio/mdev/mdev_sysfs.c   | 15 +++++++++------
 include/linux/mdev.h             |  3 +++
 4 files changed, 33 insertions(+), 7 deletions(-)

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 2a20bdaf614214..5ae06f951a0998 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -33,6 +33,26 @@ struct device *mdev_parent_dev(struct mdev_device *mdev)
 }
 EXPORT_SYMBOL(mdev_parent_dev);
 
+/*
+ * Return the index in supported_type_groups that this mdev_device was created
+ * from.
+ */
+unsigned int mdev_get_type_group_id(struct mdev_device *mdev)
+{
+	return mdev->type->type_group_id;
+}
+EXPORT_SYMBOL(mdev_get_type_group_id);
+
+/*
+ * Used in mdev_type_attribute sysfs functions to return the index in the
+ * supported_type_groups that the sysfs is called from.
+ */
+unsigned int mtype_get_type_group_id(struct kobject *mtype_kobj)
+{
+	return container_of(mtype_kobj, struct mdev_type, kobj)->type_group_id;
+}
+EXPORT_SYMBOL(mtype_get_type_group_id);
+
 /* Should be called holding parent_list_lock */
 static struct mdev_parent *__find_parent_device(struct device *dev)
 {
diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h
index 10eccc35782c4d..a656cfe0346c33 100644
--- a/drivers/vfio/mdev/mdev_private.h
+++ b/drivers/vfio/mdev/mdev_private.h
@@ -29,7 +29,7 @@ struct mdev_type {
 	struct kobject *devices_kobj;
 	struct mdev_parent *parent;
 	struct list_head next;
-	struct attribute_group *group;
+	unsigned int type_group_id;
 };
 
 #define to_mdev_type_attr(_attr)	\
diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index 8c169d12ba7dbb..712fbc78b12e2d 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -92,9 +92,11 @@ static struct kobj_type mdev_type_ktype = {
 };
 
 static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
-						 struct attribute_group *group)
+						 unsigned int type_group_id)
 {
 	struct mdev_type *type;
+	struct attribute_group *group =
+		parent->ops->supported_type_groups[type_group_id];
 	int ret;
 
 	if (!group->name) {
@@ -110,6 +112,7 @@ static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
 	type->parent = parent;
 	/* Pairs with the put in mdev_type_release() */
 	mdev_get_parent(parent);
+	type->type_group_id = type_group_id;
 
 	ret = kobject_init_and_add(&type->kobj, &mdev_type_ktype, NULL,
 				   "%s-%s", dev_driver_string(parent->dev),
@@ -135,8 +138,6 @@ static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
 		ret = -ENOMEM;
 		goto attrs_failed;
 	}
-
-	type->group = group;
 	return type;
 
 attrs_failed:
@@ -151,8 +152,11 @@ static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
 
 static void remove_mdev_supported_type(struct mdev_type *type)
 {
+	struct attribute_group *group =
+		type->parent->ops->supported_type_groups[type->type_group_id];
+
 	sysfs_remove_files(&type->kobj,
-			   (const struct attribute **)type->group->attrs);
+			   (const struct attribute **)group->attrs);
 	kobject_put(type->devices_kobj);
 	sysfs_remove_file(&type->kobj, &mdev_type_attr_create.attr);
 	kobject_del(&type->kobj);
@@ -166,8 +170,7 @@ static int add_mdev_supported_type_groups(struct mdev_parent *parent)
 	for (i = 0; parent->ops->supported_type_groups[i]; i++) {
 		struct mdev_type *type;
 
-		type = add_mdev_supported_type(parent,
-					parent->ops->supported_type_groups[i]);
+		type = add_mdev_supported_type(parent, i);
 		if (IS_ERR(type)) {
 			struct mdev_type *ltype, *tmp;
 
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index fb582adda28a9b..41e91936522394 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -46,6 +46,9 @@ static inline struct device *mdev_get_iommu_device(struct mdev_device *mdev)
 	return mdev->iommu_device;
 }
 
+unsigned int mdev_get_type_group_id(struct mdev_device *mdev);
+unsigned int mtype_get_type_group_id(struct kobject *mtype_kobj);
+
 /**
  * struct mdev_parent_ops - Structure to be registered for each parent device to
  * register the device to mdev module.
-- 
2.31.1

[PATCH v2 12/18] vfio/mtty: Use mdev_get_type_group_id()

[Jason Gunthorpe]

The type_group_id directly gives the single or dual port index, no
need for string searching.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 samples/vfio-mdev/mtty.c | 50 ++++++----------------------------------
 1 file changed, 7 insertions(+), 43 deletions(-)

diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
index ce84a300a4dafd..191a587a8d5ab1 100644
--- a/samples/vfio-mdev/mtty.c
+++ b/samples/vfio-mdev/mtty.c
@@ -711,23 +711,7 @@ static ssize_t mdev_access(struct mdev_device *mdev, u8 *buf, size_t count,
 static int mtty_create(struct kobject *kobj, struct mdev_device *mdev)
 {
 	struct mdev_state *mdev_state;
-	char name[MTTY_STRING_LEN];
-	int nr_ports = 0, i;
-
-	if (!mdev)
-		return -EINVAL;
-
-	for (i = 0; i < 2; i++) {
-		snprintf(name, MTTY_STRING_LEN, "%s-%d",
-			dev_driver_string(mdev_parent_dev(mdev)), i + 1);
-		if (!strcmp(kobj->name, name)) {
-			nr_ports = i + 1;
-			break;
-		}
-	}
-
-	if (!nr_ports)
-		return -EINVAL;
+	int nr_ports = mdev_get_type_group_id(mdev) + 1;
 
 	mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
 	if (mdev_state == NULL)
@@ -1311,18 +1295,11 @@ static const struct attribute_group *mdev_dev_groups[] = {
 static ssize_t
 name_show(struct kobject *kobj, struct device *dev, char *buf)
 {
-	char name[MTTY_STRING_LEN];
-	int i;
-	const char *name_str[2] = {"Single port serial", "Dual port serial"};
+	static const char *name_str[2] = { "Single port serial",
+					   "Dual port serial" };
 
-	for (i = 0; i < 2; i++) {
-		snprintf(name, MTTY_STRING_LEN, "%s-%d",
-			 dev_driver_string(dev), i + 1);
-		if (!strcmp(kobj->name, name))
-			return sprintf(buf, "%s\n", name_str[i]);
-	}
-
-	return -EINVAL;
+	return sysfs_emit(buf, "%s\n",
+			  name_str[mtype_get_type_group_id(kobj)]);
 }
 
 static MDEV_TYPE_ATTR_RO(name);
@@ -1330,22 +1307,9 @@ static MDEV_TYPE_ATTR_RO(name);
 static ssize_t
 available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
 {
-	char name[MTTY_STRING_LEN];
-	int i;
 	struct mdev_state *mds;
-	int ports = 0, used = 0;
-
-	for (i = 0; i < 2; i++) {
-		snprintf(name, MTTY_STRING_LEN, "%s-%d",
-			 dev_driver_string(dev), i + 1);
-		if (!strcmp(kobj->name, name)) {
-			ports = i + 1;
-			break;
-		}
-	}
-
-	if (!ports)
-		return -EINVAL;
+	unsigned int ports = mtype_get_type_group_id(kobj) + 1;
+	int used = 0;
 
 	list_for_each_entry(mds, &mdev_devices_list, next)
 		used += mds->nr_ports;
-- 
2.31.1

[PATCH v2 13/18] vfio/mdpy: Use mdev_get_type_group_id()

[Jason Gunthorpe]

The mdpy_types array is parallel to the supported_type_groups array, so
the type_group_id indexes both. Instead of doing string searching just
directly index with type_group_id in all places.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 samples/vfio-mdev/mdpy.c | 22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c
index d4ec2b52ca49a1..08c15f9f06a880 100644
--- a/samples/vfio-mdev/mdpy.c
+++ b/samples/vfio-mdev/mdpy.c
@@ -99,16 +99,6 @@ struct mdev_state {
 	void *memblk;
 };
 
-static const struct mdpy_type *mdpy_find_type(struct kobject *kobj)
-{
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(mdpy_types); i++)
-		if (strcmp(mdpy_types[i].name, kobj->name) == 0)
-			return mdpy_types + i;
-	return NULL;
-}
-
 static void mdpy_create_config_space(struct mdev_state *mdev_state)
 {
 	STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID],
@@ -228,7 +218,8 @@ static int mdpy_reset(struct mdev_device *mdev)
 
 static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev)
 {
-	const struct mdpy_type *type = mdpy_find_type(kobj);
+	const struct mdpy_type *type =
+		&mdpy_types[mdev_get_type_group_id(mdev)];
 	struct device *dev = mdev_dev(mdev);
 	struct mdev_state *mdev_state;
 	u32 fbsize;
@@ -246,8 +237,6 @@ static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev)
 		return -ENOMEM;
 	}
 
-	if (!type)
-		type = &mdpy_types[0];
 	fbsize = roundup_pow_of_two(type->width * type->height * type->bytepp);
 
 	mdev_state->memblk = vmalloc_user(fbsize);
@@ -256,8 +245,8 @@ static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev)
 		kfree(mdev_state);
 		return -ENOMEM;
 	}
-	dev_info(dev, "%s: %s (%dx%d)\n",
-		 __func__, kobj->name, type->width, type->height);
+	dev_info(dev, "%s: %s (%dx%d)\n", __func__, type->name, type->width,
+		 type->height);
 
 	mutex_init(&mdev_state->ops_lock);
 	mdev_state->mdev = mdev;
@@ -673,7 +662,8 @@ static MDEV_TYPE_ATTR_RO(name);
 static ssize_t
 description_show(struct kobject *kobj, struct device *dev, char *buf)
 {
-	const struct mdpy_type *type = mdpy_find_type(kobj);
+	const struct mdpy_type *type =
+		&mdpy_types[mtype_get_type_group_id(kobj)];
 
 	return sprintf(buf, "virtual display, %dx%d framebuffer\n",
 		       type ? type->width  : 0,
-- 
2.31.1

[PATCH v2 14/18] vfio/mbochs: Use mdev_get_type_group_id()

[Jason Gunthorpe]

The mbochs_types array is parallel to the supported_type_groups array, so
the type_group_id indexes both. Instead of doing string searching just
directly index with type_group_id in all places.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 samples/vfio-mdev/mbochs.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index 365afbe2dea558..a1af30df10a2ee 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -205,16 +205,6 @@ static struct page *__mbochs_get_page(struct mdev_state *mdev_state,
 static struct page *mbochs_get_page(struct mdev_state *mdev_state,
 				    pgoff_t pgoff);
 
-static const struct mbochs_type *mbochs_find_type(struct kobject *kobj)
-{
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(mbochs_types); i++)
-		if (strcmp(mbochs_types[i].name, kobj->name) == 0)
-			return mbochs_types + i;
-	return NULL;
-}
-
 static void mbochs_create_config_space(struct mdev_state *mdev_state)
 {
 	STORE_LE16((u16 *) &mdev_state->vconfig[PCI_VENDOR_ID],
@@ -518,7 +508,8 @@ static int mbochs_reset(struct mdev_device *mdev)
 
 static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev)
 {
-	const struct mbochs_type *type = mbochs_find_type(kobj);
+	const struct mbochs_type *type =
+		&mbochs_types[mdev_get_type_group_id(mdev)];
 	struct device *dev = mdev_dev(mdev);
 	struct mdev_state *mdev_state;
 
@@ -544,7 +535,7 @@ static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev)
 		goto err_mem;
 
 	dev_info(dev, "%s: %s, %d MB, %ld pages\n", __func__,
-		 kobj->name, type->mbytes, mdev_state->pagecount);
+		 type->name, type->mbytes, mdev_state->pagecount);
 
 	mutex_init(&mdev_state->ops_lock);
 	mdev_state->mdev = mdev;
@@ -1349,7 +1340,8 @@ static MDEV_TYPE_ATTR_RO(name);
 static ssize_t
 description_show(struct kobject *kobj, struct device *dev, char *buf)
 {
-	const struct mbochs_type *type = mbochs_find_type(kobj);
+	const struct mbochs_type *type =
+		&mbochs_types[mtype_get_type_group_id(kobj)];
 
 	return sprintf(buf, "virtual display, %d MB video memory\n",
 		       type ? type->mbytes  : 0);
@@ -1359,7 +1351,8 @@ static MDEV_TYPE_ATTR_RO(description);
 static ssize_t
 available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
 {
-	const struct mbochs_type *type = mbochs_find_type(kobj);
+	const struct mbochs_type *type =
+		&mbochs_types[mtype_get_type_group_id(kobj)];
 	int count = (max_mbytes - mbochs_used_mbytes) / type->mbytes;
 
 	return sprintf(buf, "%d\n", count);
-- 
2.31.1

[PATCH v2 15/18] vfio/gvt: Make DRM_I915_GVT depend on VFIO_MDEV

[Jason Gunthorpe]

At some point there may have been some reason for this weird split in this
driver, but today only the VFIO side is actually implemented.

However, it got messed up at some point and mdev code was put in gvt.c and
is pretending to be "generic" by masquerading as some generic attribute list:

   static MDEV_TYPE_ATTR_RO(description);

But MDEV_TYPE attributes are only usable with mdev_device, nothing else.

Ideally all of this would be moved to kvmgt.c, but it is entangled with
the rest of the "generic" code in an odd way. Thus put in a kconfig
dependency so we don't get randconfig failures when the next patch creates
a link time dependency related to the use of MDEV_TYPE.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/gpu/drm/i915/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index 1e1cb245fca778..483e9ff8ca1d23 100644
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -101,6 +101,7 @@ config DRM_I915_GVT
 	bool "Enable Intel GVT-g graphics virtualization host support"
 	depends on DRM_I915
 	depends on 64BIT
+	depends on VFIO_MDEV
 	default n
 	help
 	  Choose this option if you want to enable Intel GVT-g graphics
-- 
2.31.1

_______________________________________________
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dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[Intel-gfx] [PATCH v2 15/18] vfio/gvt: Make DRM_I915_GVT depend on VFIO_MDEV

[Jason Gunthorpe]

At some point there may have been some reason for this weird split in this
driver, but today only the VFIO side is actually implemented.

However, it got messed up at some point and mdev code was put in gvt.c and
is pretending to be "generic" by masquerading as some generic attribute list:

   static MDEV_TYPE_ATTR_RO(description);

But MDEV_TYPE attributes are only usable with mdev_device, nothing else.

Ideally all of this would be moved to kvmgt.c, but it is entangled with
the rest of the "generic" code in an odd way. Thus put in a kconfig
dependency so we don't get randconfig failures when the next patch creates
a link time dependency related to the use of MDEV_TYPE.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/gpu/drm/i915/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index 1e1cb245fca778..483e9ff8ca1d23 100644
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -101,6 +101,7 @@ config DRM_I915_GVT
 	bool "Enable Intel GVT-g graphics virtualization host support"
 	depends on DRM_I915
 	depends on 64BIT
+	depends on VFIO_MDEV
 	default n
 	help
 	  Choose this option if you want to enable Intel GVT-g graphics
-- 
2.31.1

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [Intel-gfx] [PATCH v2 15/18] vfio/gvt: Make DRM_I915_GVT depend on VFIO_MDEV

[Zhenyu Wang]

[-- Attachment #1.1: Type: text/plain, Size: 1548 bytes --]

On 2021.04.06 16:40:38 -0300, Jason Gunthorpe wrote:
> At some point there may have been some reason for this weird split in this
> driver, but today only the VFIO side is actually implemented.
> 
> However, it got messed up at some point and mdev code was put in gvt.c and
> is pretending to be "generic" by masquerading as some generic attribute list:
> 
>    static MDEV_TYPE_ATTR_RO(description);
> 
> But MDEV_TYPE attributes are only usable with mdev_device, nothing else.
> 
> Ideally all of this would be moved to kvmgt.c, but it is entangled with
> the rest of the "generic" code in an odd way. Thus put in a kconfig
> dependency so we don't get randconfig failures when the next patch creates
> a link time dependency related to the use of MDEV_TYPE.
> 
> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> ---
>  drivers/gpu/drm/i915/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
> index 1e1cb245fca778..483e9ff8ca1d23 100644
> --- a/drivers/gpu/drm/i915/Kconfig
> +++ b/drivers/gpu/drm/i915/Kconfig
> @@ -101,6 +101,7 @@ config DRM_I915_GVT
>  	bool "Enable Intel GVT-g graphics virtualization host support"
>  	depends on DRM_I915
>  	depends on 64BIT
> +	depends on VFIO_MDEV
>  	default n
>  	help
>  	  Choose this option if you want to enable Intel GVT-g graphics
> -- 

Acked-by: Zhenyu Wang <zhenyuw@linux.intel.com>

[-- Attachment #1.2: signature.asc --]
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[-- Attachment #2: Type: text/plain, Size: 160 bytes --]

_______________________________________________
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Re: [Intel-gfx] [PATCH v2 15/18] vfio/gvt: Make DRM_I915_GVT depend on VFIO_MDEV

[Zhenyu Wang]

[-- Attachment #1.1: Type: text/plain, Size: 1548 bytes --]

On 2021.04.06 16:40:38 -0300, Jason Gunthorpe wrote:
> At some point there may have been some reason for this weird split in this
> driver, but today only the VFIO side is actually implemented.
> 
> However, it got messed up at some point and mdev code was put in gvt.c and
> is pretending to be "generic" by masquerading as some generic attribute list:
> 
>    static MDEV_TYPE_ATTR_RO(description);
> 
> But MDEV_TYPE attributes are only usable with mdev_device, nothing else.
> 
> Ideally all of this would be moved to kvmgt.c, but it is entangled with
> the rest of the "generic" code in an odd way. Thus put in a kconfig
> dependency so we don't get randconfig failures when the next patch creates
> a link time dependency related to the use of MDEV_TYPE.
> 
> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> ---
>  drivers/gpu/drm/i915/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
> index 1e1cb245fca778..483e9ff8ca1d23 100644
> --- a/drivers/gpu/drm/i915/Kconfig
> +++ b/drivers/gpu/drm/i915/Kconfig
> @@ -101,6 +101,7 @@ config DRM_I915_GVT
>  	bool "Enable Intel GVT-g graphics virtualization host support"
>  	depends on DRM_I915
>  	depends on 64BIT
> +	depends on VFIO_MDEV
>  	default n
>  	help
>  	  Choose this option if you want to enable Intel GVT-g graphics
> -- 

Acked-by: Zhenyu Wang <zhenyuw@linux.intel.com>

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[-- Type: application/pgp-signature, Size: 195 bytes --]

[-- Attachment #2: Type: text/plain, Size: 160 bytes --]

_______________________________________________
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https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH v2 16/18] vfio/gvt: Use mdev_get_type_group_id()

[Jason Gunthorpe]

intel_gvt_init_vgpu_type_groups() makes gvt->types 1:1 with the
supported_type_groups array, so the type_group_id is also the index into
gvt->types. Use it directly and remove the string matching.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/gpu/drm/i915/gvt/gvt.c   | 24 +++++++-----------------
 drivers/gpu/drm/i915/gvt/gvt.h   |  4 ++--
 drivers/gpu/drm/i915/gvt/kvmgt.c |  5 ++---
 3 files changed, 11 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
index d1d8ee4a5f16a3..4b47a18e9dfa0f 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.c
+++ b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -46,22 +46,12 @@ static const char * const supported_hypervisors[] = {
 	[INTEL_GVT_HYPERVISOR_KVM] = "KVM",
 };
 
-static struct intel_vgpu_type *intel_gvt_find_vgpu_type(struct intel_gvt *gvt,
-		const char *name)
+static struct intel_vgpu_type *
+intel_gvt_find_vgpu_type(struct intel_gvt *gvt, unsigned int type_group_id)
 {
-	const char *driver_name =
-		dev_driver_string(&gvt->gt->i915->drm.pdev->dev);
-	int i;
-
-	name += strlen(driver_name) + 1;
-	for (i = 0; i < gvt->num_types; i++) {
-		struct intel_vgpu_type *t = &gvt->types[i];
-
-		if (!strncmp(t->name, name, sizeof(t->name)))
-			return t;
-	}
-
-	return NULL;
+	if (WARN_ON(type_group_id >= gvt->num_types))
+		return NULL;
+	return &gvt->types[type_group_id];
 }
 
 static ssize_t available_instances_show(struct kobject *kobj,
@@ -71,7 +61,7 @@ static ssize_t available_instances_show(struct kobject *kobj,
 	unsigned int num = 0;
 	void *gvt = kdev_to_i915(dev)->gvt;
 
-	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
+	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(kobj));
 	if (!type)
 		num = 0;
 	else
@@ -92,7 +82,7 @@ static ssize_t description_show(struct kobject *kobj, struct device *dev,
 	struct intel_vgpu_type *type;
 	void *gvt = kdev_to_i915(dev)->gvt;
 
-	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
+	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(kobj));
 	if (!type)
 		return 0;
 
diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
index 03c993d68f105a..0cf480f42850d2 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.h
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -569,8 +569,8 @@ struct intel_gvt_ops {
 	void (*vgpu_reset)(struct intel_vgpu *);
 	void (*vgpu_activate)(struct intel_vgpu *);
 	void (*vgpu_deactivate)(struct intel_vgpu *);
-	struct intel_vgpu_type *(*gvt_find_vgpu_type)(struct intel_gvt *gvt,
-			const char *name);
+	struct intel_vgpu_type *(*gvt_find_vgpu_type)(
+		struct intel_gvt *gvt, unsigned int type_group_id);
 	bool (*get_gvt_attrs)(struct attribute_group ***intel_vgpu_type_groups);
 	int (*vgpu_query_plane)(struct intel_vgpu *vgpu, void *);
 	int (*vgpu_get_dmabuf)(struct intel_vgpu *vgpu, unsigned int);
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index b4348256ae9591..16e1e4a38aa1f6 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -700,10 +700,9 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
 	pdev = mdev_parent_dev(mdev);
 	gvt = kdev_to_i915(pdev)->gvt;
 
-	type = intel_gvt_ops->gvt_find_vgpu_type(gvt, kobject_name(kobj));
+	type = intel_gvt_ops->gvt_find_vgpu_type(gvt,
+						 mdev_get_type_group_id(mdev));
 	if (!type) {
-		gvt_vgpu_err("failed to find type %s to create\n",
-						kobject_name(kobj));
 		ret = -EINVAL;
 		goto out;
 	}
-- 
2.31.1

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[Intel-gfx] [PATCH v2 16/18] vfio/gvt: Use mdev_get_type_group_id()

[Jason Gunthorpe]

intel_gvt_init_vgpu_type_groups() makes gvt->types 1:1 with the
supported_type_groups array, so the type_group_id is also the index into
gvt->types. Use it directly and remove the string matching.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/gpu/drm/i915/gvt/gvt.c   | 24 +++++++-----------------
 drivers/gpu/drm/i915/gvt/gvt.h   |  4 ++--
 drivers/gpu/drm/i915/gvt/kvmgt.c |  5 ++---
 3 files changed, 11 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
index d1d8ee4a5f16a3..4b47a18e9dfa0f 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.c
+++ b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -46,22 +46,12 @@ static const char * const supported_hypervisors[] = {
 	[INTEL_GVT_HYPERVISOR_KVM] = "KVM",
 };
 
-static struct intel_vgpu_type *intel_gvt_find_vgpu_type(struct intel_gvt *gvt,
-		const char *name)
+static struct intel_vgpu_type *
+intel_gvt_find_vgpu_type(struct intel_gvt *gvt, unsigned int type_group_id)
 {
-	const char *driver_name =
-		dev_driver_string(&gvt->gt->i915->drm.pdev->dev);
-	int i;
-
-	name += strlen(driver_name) + 1;
-	for (i = 0; i < gvt->num_types; i++) {
-		struct intel_vgpu_type *t = &gvt->types[i];
-
-		if (!strncmp(t->name, name, sizeof(t->name)))
-			return t;
-	}
-
-	return NULL;
+	if (WARN_ON(type_group_id >= gvt->num_types))
+		return NULL;
+	return &gvt->types[type_group_id];
 }
 
 static ssize_t available_instances_show(struct kobject *kobj,
@@ -71,7 +61,7 @@ static ssize_t available_instances_show(struct kobject *kobj,
 	unsigned int num = 0;
 	void *gvt = kdev_to_i915(dev)->gvt;
 
-	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
+	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(kobj));
 	if (!type)
 		num = 0;
 	else
@@ -92,7 +82,7 @@ static ssize_t description_show(struct kobject *kobj, struct device *dev,
 	struct intel_vgpu_type *type;
 	void *gvt = kdev_to_i915(dev)->gvt;
 
-	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
+	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(kobj));
 	if (!type)
 		return 0;
 
diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
index 03c993d68f105a..0cf480f42850d2 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.h
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -569,8 +569,8 @@ struct intel_gvt_ops {
 	void (*vgpu_reset)(struct intel_vgpu *);
 	void (*vgpu_activate)(struct intel_vgpu *);
 	void (*vgpu_deactivate)(struct intel_vgpu *);
-	struct intel_vgpu_type *(*gvt_find_vgpu_type)(struct intel_gvt *gvt,
-			const char *name);
+	struct intel_vgpu_type *(*gvt_find_vgpu_type)(
+		struct intel_gvt *gvt, unsigned int type_group_id);
 	bool (*get_gvt_attrs)(struct attribute_group ***intel_vgpu_type_groups);
 	int (*vgpu_query_plane)(struct intel_vgpu *vgpu, void *);
 	int (*vgpu_get_dmabuf)(struct intel_vgpu *vgpu, unsigned int);
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index b4348256ae9591..16e1e4a38aa1f6 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -700,10 +700,9 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
 	pdev = mdev_parent_dev(mdev);
 	gvt = kdev_to_i915(pdev)->gvt;
 
-	type = intel_gvt_ops->gvt_find_vgpu_type(gvt, kobject_name(kobj));
+	type = intel_gvt_ops->gvt_find_vgpu_type(gvt,
+						 mdev_get_type_group_id(mdev));
 	if (!type) {
-		gvt_vgpu_err("failed to find type %s to create\n",
-						kobject_name(kobj));
 		ret = -EINVAL;
 		goto out;
 	}
-- 
2.31.1

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Re: [PATCH v2 16/18] vfio/gvt: Use mdev_get_type_group_id()

[Zhenyu Wang]

[-- Attachment #1.1: Type: text/plain, Size: 4123 bytes --]

On 2021.04.06 16:40:39 -0300, Jason Gunthorpe wrote:
> intel_gvt_init_vgpu_type_groups() makes gvt->types 1:1 with the
> supported_type_groups array, so the type_group_id is also the index into
> gvt->types. Use it directly and remove the string matching.
> 
> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> ---

Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>

For two gvt specific changes in this series, it's better to just merge through
vfio tree.

Thanks

>  drivers/gpu/drm/i915/gvt/gvt.c   | 24 +++++++-----------------
>  drivers/gpu/drm/i915/gvt/gvt.h   |  4 ++--
>  drivers/gpu/drm/i915/gvt/kvmgt.c |  5 ++---
>  3 files changed, 11 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
> index d1d8ee4a5f16a3..4b47a18e9dfa0f 100644
> --- a/drivers/gpu/drm/i915/gvt/gvt.c
> +++ b/drivers/gpu/drm/i915/gvt/gvt.c
> @@ -46,22 +46,12 @@ static const char * const supported_hypervisors[] = {
>  	[INTEL_GVT_HYPERVISOR_KVM] = "KVM",
>  };
>  
> -static struct intel_vgpu_type *intel_gvt_find_vgpu_type(struct intel_gvt *gvt,
> -		const char *name)
> +static struct intel_vgpu_type *
> +intel_gvt_find_vgpu_type(struct intel_gvt *gvt, unsigned int type_group_id)
>  {
> -	const char *driver_name =
> -		dev_driver_string(&gvt->gt->i915->drm.pdev->dev);
> -	int i;
> -
> -	name += strlen(driver_name) + 1;
> -	for (i = 0; i < gvt->num_types; i++) {
> -		struct intel_vgpu_type *t = &gvt->types[i];
> -
> -		if (!strncmp(t->name, name, sizeof(t->name)))
> -			return t;
> -	}
> -
> -	return NULL;
> +	if (WARN_ON(type_group_id >= gvt->num_types))
> +		return NULL;
> +	return &gvt->types[type_group_id];
>  }
>  
>  static ssize_t available_instances_show(struct kobject *kobj,
> @@ -71,7 +61,7 @@ static ssize_t available_instances_show(struct kobject *kobj,
>  	unsigned int num = 0;
>  	void *gvt = kdev_to_i915(dev)->gvt;
>  
> -	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
> +	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(kobj));
>  	if (!type)
>  		num = 0;
>  	else
> @@ -92,7 +82,7 @@ static ssize_t description_show(struct kobject *kobj, struct device *dev,
>  	struct intel_vgpu_type *type;
>  	void *gvt = kdev_to_i915(dev)->gvt;
>  
> -	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
> +	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(kobj));
>  	if (!type)
>  		return 0;
>  
> diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
> index 03c993d68f105a..0cf480f42850d2 100644
> --- a/drivers/gpu/drm/i915/gvt/gvt.h
> +++ b/drivers/gpu/drm/i915/gvt/gvt.h
> @@ -569,8 +569,8 @@ struct intel_gvt_ops {
>  	void (*vgpu_reset)(struct intel_vgpu *);
>  	void (*vgpu_activate)(struct intel_vgpu *);
>  	void (*vgpu_deactivate)(struct intel_vgpu *);
> -	struct intel_vgpu_type *(*gvt_find_vgpu_type)(struct intel_gvt *gvt,
> -			const char *name);
> +	struct intel_vgpu_type *(*gvt_find_vgpu_type)(
> +		struct intel_gvt *gvt, unsigned int type_group_id);
>  	bool (*get_gvt_attrs)(struct attribute_group ***intel_vgpu_type_groups);
>  	int (*vgpu_query_plane)(struct intel_vgpu *vgpu, void *);
>  	int (*vgpu_get_dmabuf)(struct intel_vgpu *vgpu, unsigned int);
> diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
> index b4348256ae9591..16e1e4a38aa1f6 100644
> --- a/drivers/gpu/drm/i915/gvt/kvmgt.c
> +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
> @@ -700,10 +700,9 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
>  	pdev = mdev_parent_dev(mdev);
>  	gvt = kdev_to_i915(pdev)->gvt;
>  
> -	type = intel_gvt_ops->gvt_find_vgpu_type(gvt, kobject_name(kobj));
> +	type = intel_gvt_ops->gvt_find_vgpu_type(gvt,
> +						 mdev_get_type_group_id(mdev));
>  	if (!type) {
> -		gvt_vgpu_err("failed to find type %s to create\n",
> -						kobject_name(kobj));
>  		ret = -EINVAL;
>  		goto out;
>  	}
> -- 
> 2.31.1
> 

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Re: [Intel-gfx] [PATCH v2 16/18] vfio/gvt: Use mdev_get_type_group_id()

[Zhenyu Wang]

[-- Attachment #1.1: Type: text/plain, Size: 4123 bytes --]

On 2021.04.06 16:40:39 -0300, Jason Gunthorpe wrote:
> intel_gvt_init_vgpu_type_groups() makes gvt->types 1:1 with the
> supported_type_groups array, so the type_group_id is also the index into
> gvt->types. Use it directly and remove the string matching.
> 
> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> ---

Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>

For two gvt specific changes in this series, it's better to just merge through
vfio tree.

Thanks

>  drivers/gpu/drm/i915/gvt/gvt.c   | 24 +++++++-----------------
>  drivers/gpu/drm/i915/gvt/gvt.h   |  4 ++--
>  drivers/gpu/drm/i915/gvt/kvmgt.c |  5 ++---
>  3 files changed, 11 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
> index d1d8ee4a5f16a3..4b47a18e9dfa0f 100644
> --- a/drivers/gpu/drm/i915/gvt/gvt.c
> +++ b/drivers/gpu/drm/i915/gvt/gvt.c
> @@ -46,22 +46,12 @@ static const char * const supported_hypervisors[] = {
>  	[INTEL_GVT_HYPERVISOR_KVM] = "KVM",
>  };
>  
> -static struct intel_vgpu_type *intel_gvt_find_vgpu_type(struct intel_gvt *gvt,
> -		const char *name)
> +static struct intel_vgpu_type *
> +intel_gvt_find_vgpu_type(struct intel_gvt *gvt, unsigned int type_group_id)
>  {
> -	const char *driver_name =
> -		dev_driver_string(&gvt->gt->i915->drm.pdev->dev);
> -	int i;
> -
> -	name += strlen(driver_name) + 1;
> -	for (i = 0; i < gvt->num_types; i++) {
> -		struct intel_vgpu_type *t = &gvt->types[i];
> -
> -		if (!strncmp(t->name, name, sizeof(t->name)))
> -			return t;
> -	}
> -
> -	return NULL;
> +	if (WARN_ON(type_group_id >= gvt->num_types))
> +		return NULL;
> +	return &gvt->types[type_group_id];
>  }
>  
>  static ssize_t available_instances_show(struct kobject *kobj,
> @@ -71,7 +61,7 @@ static ssize_t available_instances_show(struct kobject *kobj,
>  	unsigned int num = 0;
>  	void *gvt = kdev_to_i915(dev)->gvt;
>  
> -	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
> +	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(kobj));
>  	if (!type)
>  		num = 0;
>  	else
> @@ -92,7 +82,7 @@ static ssize_t description_show(struct kobject *kobj, struct device *dev,
>  	struct intel_vgpu_type *type;
>  	void *gvt = kdev_to_i915(dev)->gvt;
>  
> -	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
> +	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(kobj));
>  	if (!type)
>  		return 0;
>  
> diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
> index 03c993d68f105a..0cf480f42850d2 100644
> --- a/drivers/gpu/drm/i915/gvt/gvt.h
> +++ b/drivers/gpu/drm/i915/gvt/gvt.h
> @@ -569,8 +569,8 @@ struct intel_gvt_ops {
>  	void (*vgpu_reset)(struct intel_vgpu *);
>  	void (*vgpu_activate)(struct intel_vgpu *);
>  	void (*vgpu_deactivate)(struct intel_vgpu *);
> -	struct intel_vgpu_type *(*gvt_find_vgpu_type)(struct intel_gvt *gvt,
> -			const char *name);
> +	struct intel_vgpu_type *(*gvt_find_vgpu_type)(
> +		struct intel_gvt *gvt, unsigned int type_group_id);
>  	bool (*get_gvt_attrs)(struct attribute_group ***intel_vgpu_type_groups);
>  	int (*vgpu_query_plane)(struct intel_vgpu *vgpu, void *);
>  	int (*vgpu_get_dmabuf)(struct intel_vgpu *vgpu, unsigned int);
> diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
> index b4348256ae9591..16e1e4a38aa1f6 100644
> --- a/drivers/gpu/drm/i915/gvt/kvmgt.c
> +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
> @@ -700,10 +700,9 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
>  	pdev = mdev_parent_dev(mdev);
>  	gvt = kdev_to_i915(pdev)->gvt;
>  
> -	type = intel_gvt_ops->gvt_find_vgpu_type(gvt, kobject_name(kobj));
> +	type = intel_gvt_ops->gvt_find_vgpu_type(gvt,
> +						 mdev_get_type_group_id(mdev));
>  	if (!type) {
> -		gvt_vgpu_err("failed to find type %s to create\n",
> -						kobject_name(kobj));
>  		ret = -EINVAL;
>  		goto out;
>  	}
> -- 
> 2.31.1
> 

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[-- Attachment #2: Type: text/plain, Size: 160 bytes --]

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[PATCH v2 17/18] vfio/mdev: Remove kobj from mdev_parent_ops->create()

[Jason Gunthorpe]

The kobj here is a type-erased version of mdev_type, which is already
stored in the struct mdev_device being passed in. It was only ever used to
compute the type_group_id, which is now extracted directly from the mdev.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/gpu/drm/i915/gvt/kvmgt.c  | 2 +-
 drivers/s390/cio/vfio_ccw_ops.c   | 2 +-
 drivers/s390/crypto/vfio_ap_ops.c | 2 +-
 drivers/vfio/mdev/mdev_core.c     | 2 +-
 include/linux/mdev.h              | 3 +--
 samples/vfio-mdev/mbochs.c        | 2 +-
 samples/vfio-mdev/mdpy.c          | 2 +-
 samples/vfio-mdev/mtty.c          | 2 +-
 8 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 16e1e4a38aa1f6..6bf176e8426e63 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -689,7 +689,7 @@ static void kvmgt_put_vfio_device(void *vgpu)
 	vfio_device_put(vdev->vfio_device);
 }
 
-static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
+static int intel_vgpu_create(struct mdev_device *mdev)
 {
 	struct intel_vgpu *vgpu = NULL;
 	struct intel_vgpu_type *type;
diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index 767ac41686fe2f..10407cf67583c6 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -110,7 +110,7 @@ static struct attribute_group *mdev_type_groups[] = {
 	NULL,
 };
 
-static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
+static int vfio_ccw_mdev_create(struct mdev_device *mdev)
 {
 	struct vfio_ccw_private *private =
 		dev_get_drvdata(mdev_parent_dev(mdev));
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 1ffdd411201cd6..d319152dd484a2 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -322,7 +322,7 @@ static void vfio_ap_matrix_init(struct ap_config_info *info,
 	matrix->adm_max = info->apxa ? info->Nd : 15;
 }
 
-static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
+static int vfio_ap_mdev_create(struct mdev_device *mdev)
 {
 	struct ap_matrix_mdev *matrix_mdev;
 
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 5ae06f951a0998..10eff33ce1f263 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -286,7 +286,7 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 		goto out_put_device;
 	}
 
-	ret = parent->ops->create(&type->kobj, mdev);
+	ret = parent->ops->create(mdev);
 	if (ret)
 		goto out_unlock;
 
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index 41e91936522394..c3a800051d6146 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -61,7 +61,6 @@ unsigned int mtype_get_type_group_id(struct kobject *mtype_kobj);
  * @create:		Called to allocate basic resources in parent device's
  *			driver for a particular mediated device. It is
  *			mandatory to provide create ops.
- *			@kobj: kobject of type for which 'create' is called.
  *			@mdev: mdev_device structure on of mediated device
  *			      that is being created
  *			Returns integer: success (0) or error (< 0)
@@ -107,7 +106,7 @@ struct mdev_parent_ops {
 	const struct attribute_group **mdev_attr_groups;
 	struct attribute_group **supported_type_groups;
 
-	int     (*create)(struct kobject *kobj, struct mdev_device *mdev);
+	int     (*create)(struct mdev_device *mdev);
 	int     (*remove)(struct mdev_device *mdev);
 	int     (*open)(struct mdev_device *mdev);
 	void    (*release)(struct mdev_device *mdev);
diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index a1af30df10a2ee..ac4d0dc2490705 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -506,7 +506,7 @@ static int mbochs_reset(struct mdev_device *mdev)
 	return 0;
 }
 
-static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev)
+static int mbochs_create(struct mdev_device *mdev)
 {
 	const struct mbochs_type *type =
 		&mbochs_types[mdev_get_type_group_id(mdev)];
diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c
index 08c15f9f06a880..da88fd7dd42329 100644
--- a/samples/vfio-mdev/mdpy.c
+++ b/samples/vfio-mdev/mdpy.c
@@ -216,7 +216,7 @@ static int mdpy_reset(struct mdev_device *mdev)
 	return 0;
 }
 
-static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev)
+static int mdpy_create(struct mdev_device *mdev)
 {
 	const struct mdpy_type *type =
 		&mdpy_types[mdev_get_type_group_id(mdev)];
diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
index 191a587a8d5ab1..f2e36c06ac6aa2 100644
--- a/samples/vfio-mdev/mtty.c
+++ b/samples/vfio-mdev/mtty.c
@@ -708,7 +708,7 @@ static ssize_t mdev_access(struct mdev_device *mdev, u8 *buf, size_t count,
 	return ret;
 }
 
-static int mtty_create(struct kobject *kobj, struct mdev_device *mdev)
+static int mtty_create(struct mdev_device *mdev)
 {
 	struct mdev_state *mdev_state;
 	int nr_ports = mdev_get_type_group_id(mdev) + 1;
-- 
2.31.1

[Intel-gfx] [PATCH v2 17/18] vfio/mdev: Remove kobj from mdev_parent_ops->create()

[Jason Gunthorpe]

The kobj here is a type-erased version of mdev_type, which is already
stored in the struct mdev_device being passed in. It was only ever used to
compute the type_group_id, which is now extracted directly from the mdev.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/gpu/drm/i915/gvt/kvmgt.c  | 2 +-
 drivers/s390/cio/vfio_ccw_ops.c   | 2 +-
 drivers/s390/crypto/vfio_ap_ops.c | 2 +-
 drivers/vfio/mdev/mdev_core.c     | 2 +-
 include/linux/mdev.h              | 3 +--
 samples/vfio-mdev/mbochs.c        | 2 +-
 samples/vfio-mdev/mdpy.c          | 2 +-
 samples/vfio-mdev/mtty.c          | 2 +-
 8 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 16e1e4a38aa1f6..6bf176e8426e63 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -689,7 +689,7 @@ static void kvmgt_put_vfio_device(void *vgpu)
 	vfio_device_put(vdev->vfio_device);
 }
 
-static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
+static int intel_vgpu_create(struct mdev_device *mdev)
 {
 	struct intel_vgpu *vgpu = NULL;
 	struct intel_vgpu_type *type;
diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index 767ac41686fe2f..10407cf67583c6 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -110,7 +110,7 @@ static struct attribute_group *mdev_type_groups[] = {
 	NULL,
 };
 
-static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
+static int vfio_ccw_mdev_create(struct mdev_device *mdev)
 {
 	struct vfio_ccw_private *private =
 		dev_get_drvdata(mdev_parent_dev(mdev));
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 1ffdd411201cd6..d319152dd484a2 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -322,7 +322,7 @@ static void vfio_ap_matrix_init(struct ap_config_info *info,
 	matrix->adm_max = info->apxa ? info->Nd : 15;
 }
 
-static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
+static int vfio_ap_mdev_create(struct mdev_device *mdev)
 {
 	struct ap_matrix_mdev *matrix_mdev;
 
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 5ae06f951a0998..10eff33ce1f263 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -286,7 +286,7 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 		goto out_put_device;
 	}
 
-	ret = parent->ops->create(&type->kobj, mdev);
+	ret = parent->ops->create(mdev);
 	if (ret)
 		goto out_unlock;
 
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index 41e91936522394..c3a800051d6146 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -61,7 +61,6 @@ unsigned int mtype_get_type_group_id(struct kobject *mtype_kobj);
  * @create:		Called to allocate basic resources in parent device's
  *			driver for a particular mediated device. It is
  *			mandatory to provide create ops.
- *			@kobj: kobject of type for which 'create' is called.
  *			@mdev: mdev_device structure on of mediated device
  *			      that is being created
  *			Returns integer: success (0) or error (< 0)
@@ -107,7 +106,7 @@ struct mdev_parent_ops {
 	const struct attribute_group **mdev_attr_groups;
 	struct attribute_group **supported_type_groups;
 
-	int     (*create)(struct kobject *kobj, struct mdev_device *mdev);
+	int     (*create)(struct mdev_device *mdev);
 	int     (*remove)(struct mdev_device *mdev);
 	int     (*open)(struct mdev_device *mdev);
 	void    (*release)(struct mdev_device *mdev);
diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index a1af30df10a2ee..ac4d0dc2490705 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -506,7 +506,7 @@ static int mbochs_reset(struct mdev_device *mdev)
 	return 0;
 }
 
-static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev)
+static int mbochs_create(struct mdev_device *mdev)
 {
 	const struct mbochs_type *type =
 		&mbochs_types[mdev_get_type_group_id(mdev)];
diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c
index 08c15f9f06a880..da88fd7dd42329 100644
--- a/samples/vfio-mdev/mdpy.c
+++ b/samples/vfio-mdev/mdpy.c
@@ -216,7 +216,7 @@ static int mdpy_reset(struct mdev_device *mdev)
 	return 0;
 }
 
-static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev)
+static int mdpy_create(struct mdev_device *mdev)
 {
 	const struct mdpy_type *type =
 		&mdpy_types[mdev_get_type_group_id(mdev)];
diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
index 191a587a8d5ab1..f2e36c06ac6aa2 100644
--- a/samples/vfio-mdev/mtty.c
+++ b/samples/vfio-mdev/mtty.c
@@ -708,7 +708,7 @@ static ssize_t mdev_access(struct mdev_device *mdev, u8 *buf, size_t count,
 	return ret;
 }
 
-static int mtty_create(struct kobject *kobj, struct mdev_device *mdev)
+static int mtty_create(struct mdev_device *mdev)
 {
 	struct mdev_state *mdev_state;
 	int nr_ports = mdev_get_type_group_id(mdev) + 1;
-- 
2.31.1

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH v2 17/18] vfio/mdev: Remove kobj from mdev_parent_ops->create()

[Jason Gunthorpe]

The kobj here is a type-erased version of mdev_type, which is already
stored in the struct mdev_device being passed in. It was only ever used to
compute the type_group_id, which is now extracted directly from the mdev.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/gpu/drm/i915/gvt/kvmgt.c  | 2 +-
 drivers/s390/cio/vfio_ccw_ops.c   | 2 +-
 drivers/s390/crypto/vfio_ap_ops.c | 2 +-
 drivers/vfio/mdev/mdev_core.c     | 2 +-
 include/linux/mdev.h              | 3 +--
 samples/vfio-mdev/mbochs.c        | 2 +-
 samples/vfio-mdev/mdpy.c          | 2 +-
 samples/vfio-mdev/mtty.c          | 2 +-
 8 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 16e1e4a38aa1f6..6bf176e8426e63 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -689,7 +689,7 @@ static void kvmgt_put_vfio_device(void *vgpu)
 	vfio_device_put(vdev->vfio_device);
 }
 
-static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
+static int intel_vgpu_create(struct mdev_device *mdev)
 {
 	struct intel_vgpu *vgpu = NULL;
 	struct intel_vgpu_type *type;
diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index 767ac41686fe2f..10407cf67583c6 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -110,7 +110,7 @@ static struct attribute_group *mdev_type_groups[] = {
 	NULL,
 };
 
-static int vfio_ccw_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
+static int vfio_ccw_mdev_create(struct mdev_device *mdev)
 {
 	struct vfio_ccw_private *private =
 		dev_get_drvdata(mdev_parent_dev(mdev));
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 1ffdd411201cd6..d319152dd484a2 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -322,7 +322,7 @@ static void vfio_ap_matrix_init(struct ap_config_info *info,
 	matrix->adm_max = info->apxa ? info->Nd : 15;
 }
 
-static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
+static int vfio_ap_mdev_create(struct mdev_device *mdev)
 {
 	struct ap_matrix_mdev *matrix_mdev;
 
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 5ae06f951a0998..10eff33ce1f263 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -286,7 +286,7 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
 		goto out_put_device;
 	}
 
-	ret = parent->ops->create(&type->kobj, mdev);
+	ret = parent->ops->create(mdev);
 	if (ret)
 		goto out_unlock;
 
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index 41e91936522394..c3a800051d6146 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -61,7 +61,6 @@ unsigned int mtype_get_type_group_id(struct kobject *mtype_kobj);
  * @create:		Called to allocate basic resources in parent device's
  *			driver for a particular mediated device. It is
  *			mandatory to provide create ops.
- *			@kobj: kobject of type for which 'create' is called.
  *			@mdev: mdev_device structure on of mediated device
  *			      that is being created
  *			Returns integer: success (0) or error (< 0)
@@ -107,7 +106,7 @@ struct mdev_parent_ops {
 	const struct attribute_group **mdev_attr_groups;
 	struct attribute_group **supported_type_groups;
 
-	int     (*create)(struct kobject *kobj, struct mdev_device *mdev);
+	int     (*create)(struct mdev_device *mdev);
 	int     (*remove)(struct mdev_device *mdev);
 	int     (*open)(struct mdev_device *mdev);
 	void    (*release)(struct mdev_device *mdev);
diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index a1af30df10a2ee..ac4d0dc2490705 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -506,7 +506,7 @@ static int mbochs_reset(struct mdev_device *mdev)
 	return 0;
 }
 
-static int mbochs_create(struct kobject *kobj, struct mdev_device *mdev)
+static int mbochs_create(struct mdev_device *mdev)
 {
 	const struct mbochs_type *type =
 		&mbochs_types[mdev_get_type_group_id(mdev)];
diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c
index 08c15f9f06a880..da88fd7dd42329 100644
--- a/samples/vfio-mdev/mdpy.c
+++ b/samples/vfio-mdev/mdpy.c
@@ -216,7 +216,7 @@ static int mdpy_reset(struct mdev_device *mdev)
 	return 0;
 }
 
-static int mdpy_create(struct kobject *kobj, struct mdev_device *mdev)
+static int mdpy_create(struct mdev_device *mdev)
 {
 	const struct mdpy_type *type =
 		&mdpy_types[mdev_get_type_group_id(mdev)];
diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
index 191a587a8d5ab1..f2e36c06ac6aa2 100644
--- a/samples/vfio-mdev/mtty.c
+++ b/samples/vfio-mdev/mtty.c
@@ -708,7 +708,7 @@ static ssize_t mdev_access(struct mdev_device *mdev, u8 *buf, size_t count,
 	return ret;
 }
 
-static int mtty_create(struct kobject *kobj, struct mdev_device *mdev)
+static int mtty_create(struct mdev_device *mdev)
 {
 	struct mdev_state *mdev_state;
 	int nr_ports = mdev_get_type_group_id(mdev) + 1;
-- 
2.31.1

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH v2 18/18] vfio/mdev: Correct the function signatures for the mdev_type_attributes

[Jason Gunthorpe]

The driver core standard is to pass in the properly typed object, the
properly typed attribute and the buffer data. It stems from the root
kobject method:

  ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr,..)

Each subclass of kobject should provide their own function with the same
signature but more specific types, eg struct device uses:

  ssize_t (*show)(struct device *dev, struct device_attribute *attr,..)

In this case the existing signature is:

  ssize_t (*show)(struct kobject *kobj, struct device *dev,..)

Where kobj is a 'struct mdev_type *' and dev is 'mdev_type->parent->dev'.

Change the mdev_type related sysfs attribute functions to:

  ssize_t (*show)(struct mdev_type *mtype, struct mdev_type_attribute *attr,..)

In order to restore type safety and match the driver core standard

There are no current users of 'attr', but if it is ever needed it would be
hard to add in retroactively, so do it now.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/gpu/drm/i915/gvt/gvt.c    | 21 +++++++++++----------
 drivers/s390/cio/vfio_ccw_ops.c   | 15 +++++++++------
 drivers/s390/crypto/vfio_ap_ops.c | 12 +++++++-----
 drivers/vfio/mdev/mdev_core.c     | 14 ++++++++++++--
 drivers/vfio/mdev/mdev_sysfs.c    | 11 ++++++-----
 include/linux/mdev.h              | 11 +++++++----
 samples/vfio-mdev/mbochs.c        | 26 +++++++++++++++-----------
 samples/vfio-mdev/mdpy.c          | 24 ++++++++++++++----------
 samples/vfio-mdev/mtty.c          | 18 +++++++++---------
 9 files changed, 90 insertions(+), 62 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
index 4b47a18e9dfa0f..3703814a669b46 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.c
+++ b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -54,14 +54,15 @@ intel_gvt_find_vgpu_type(struct intel_gvt *gvt, unsigned int type_group_id)
 	return &gvt->types[type_group_id];
 }
 
-static ssize_t available_instances_show(struct kobject *kobj,
-					struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
 	struct intel_vgpu_type *type;
 	unsigned int num = 0;
-	void *gvt = kdev_to_i915(dev)->gvt;
+	void *gvt = kdev_to_i915(mtype_get_parent_dev(mtype))->gvt;
 
-	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(kobj));
+	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(mtype));
 	if (!type)
 		num = 0;
 	else
@@ -70,19 +71,19 @@ static ssize_t available_instances_show(struct kobject *kobj,
 	return sprintf(buf, "%u\n", num);
 }
 
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-		char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
 }
 
-static ssize_t description_show(struct kobject *kobj, struct device *dev,
-		char *buf)
+static ssize_t description_show(struct mdev_type *mtype,
+				struct mdev_type_attribute *attr, char *buf)
 {
 	struct intel_vgpu_type *type;
-	void *gvt = kdev_to_i915(dev)->gvt;
+	void *gvt = kdev_to_i915(mtype_get_parent_dev(mtype))->gvt;
 
-	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(kobj));
+	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(mtype));
 	if (!type)
 		return 0;
 
diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index 10407cf67583c6..491a64c61fff1a 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -71,23 +71,26 @@ static int vfio_ccw_mdev_notifier(struct notifier_block *nb,
 	return NOTIFY_DONE;
 }
 
-static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t name_show(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "I/O subchannel (Non-QDIO)\n");
 }
 static MDEV_TYPE_ATTR_RO(name);
 
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-			       char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_CCW_STRING);
 }
 static MDEV_TYPE_ATTR_RO(device_api);
 
-static ssize_t available_instances_show(struct kobject *kobj,
-					struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
-	struct vfio_ccw_private *private = dev_get_drvdata(dev);
+	struct vfio_ccw_private *private =
+		dev_get_drvdata(mtype_get_parent_dev(mtype));
 
 	return sprintf(buf, "%d\n", atomic_read(&private->avail));
 }
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index d319152dd484a2..0ce00c9311d378 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -366,15 +366,17 @@ static int vfio_ap_mdev_remove(struct mdev_device *mdev)
 	return 0;
 }
 
-static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t name_show(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_AP_MDEV_NAME_HWVIRT);
 }
 
 static MDEV_TYPE_ATTR_RO(name);
 
-static ssize_t available_instances_show(struct kobject *kobj,
-					struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
 	return sprintf(buf, "%d\n",
 		       atomic_read(&matrix_dev->available_instances));
@@ -382,8 +384,8 @@ static ssize_t available_instances_show(struct kobject *kobj,
 
 static MDEV_TYPE_ATTR_RO(available_instances);
 
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-			       char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_AP_STRING);
 }
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 10eff33ce1f263..2a85d6fcb7ddd0 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -47,12 +47,22 @@ EXPORT_SYMBOL(mdev_get_type_group_id);
  * Used in mdev_type_attribute sysfs functions to return the index in the
  * supported_type_groups that the sysfs is called from.
  */
-unsigned int mtype_get_type_group_id(struct kobject *mtype_kobj)
+unsigned int mtype_get_type_group_id(struct mdev_type *mtype)
 {
-	return container_of(mtype_kobj, struct mdev_type, kobj)->type_group_id;
+	return mtype->type_group_id;
 }
 EXPORT_SYMBOL(mtype_get_type_group_id);
 
+/*
+ * Used in mdev_type_attribute sysfs functions to return the parent struct
+ * device
+ */
+struct device *mtype_get_parent_dev(struct mdev_type *mtype)
+{
+	return mtype->parent->dev;
+}
+EXPORT_SYMBOL(mtype_get_parent_dev);
+
 /* Should be called holding parent_list_lock */
 static struct mdev_parent *__find_parent_device(struct device *dev)
 {
diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index 712fbc78b12e2d..f5cf1931c54e48 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -26,7 +26,7 @@ static ssize_t mdev_type_attr_show(struct kobject *kobj,
 	ssize_t ret = -EIO;
 
 	if (attr->show)
-		ret = attr->show(kobj, type->parent->dev, buf);
+		ret = attr->show(type, attr, buf);
 	return ret;
 }
 
@@ -39,7 +39,7 @@ static ssize_t mdev_type_attr_store(struct kobject *kobj,
 	ssize_t ret = -EIO;
 
 	if (attr->store)
-		ret = attr->store(&type->kobj, type->parent->dev, buf, count);
+		ret = attr->store(type, attr, buf, count);
 	return ret;
 }
 
@@ -48,8 +48,9 @@ static const struct sysfs_ops mdev_type_sysfs_ops = {
 	.store = mdev_type_attr_store,
 };
 
-static ssize_t create_store(struct kobject *kobj, struct device *dev,
-			    const char *buf, size_t count)
+static ssize_t create_store(struct mdev_type *mtype,
+			    struct mdev_type_attribute *attr, const char *buf,
+			    size_t count)
 {
 	char *str;
 	guid_t uuid;
@@ -67,7 +68,7 @@ static ssize_t create_store(struct kobject *kobj, struct device *dev,
 	if (ret)
 		return ret;
 
-	ret = mdev_device_create(to_mdev_type(kobj), &uuid);
+	ret = mdev_device_create(mtype, &uuid);
 	if (ret)
 		return ret;
 
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index c3a800051d6146..1fb34ea394ad46 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -47,7 +47,8 @@ static inline struct device *mdev_get_iommu_device(struct mdev_device *mdev)
 }
 
 unsigned int mdev_get_type_group_id(struct mdev_device *mdev);
-unsigned int mtype_get_type_group_id(struct kobject *mtype_kobj);
+unsigned int mtype_get_type_group_id(struct mdev_type *mtype);
+struct device *mtype_get_parent_dev(struct mdev_type *mtype);
 
 /**
  * struct mdev_parent_ops - Structure to be registered for each parent device to
@@ -123,9 +124,11 @@ struct mdev_parent_ops {
 /* interface for exporting mdev supported type attributes */
 struct mdev_type_attribute {
 	struct attribute attr;
-	ssize_t (*show)(struct kobject *kobj, struct device *dev, char *buf);
-	ssize_t (*store)(struct kobject *kobj, struct device *dev,
-			 const char *buf, size_t count);
+	ssize_t (*show)(struct mdev_type *mtype,
+			struct mdev_type_attribute *attr, char *buf);
+	ssize_t (*store)(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, const char *buf,
+			 size_t count);
 };
 
 #define MDEV_TYPE_ATTR(_name, _mode, _show, _store)		\
diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index ac4d0dc2490705..861c76914e7639 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -1330,37 +1330,41 @@ static const struct attribute_group *mdev_dev_groups[] = {
 	NULL,
 };
 
-static ssize_t
-name_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t name_show(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%s\n", kobj->name);
+	const struct mbochs_type *type =
+		&mbochs_types[mtype_get_type_group_id(mtype)];
+
+	return sprintf(buf, "%s\n", type->name);
 }
 static MDEV_TYPE_ATTR_RO(name);
 
-static ssize_t
-description_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t description_show(struct mdev_type *mtype,
+				struct mdev_type_attribute *attr, char *buf)
 {
 	const struct mbochs_type *type =
-		&mbochs_types[mtype_get_type_group_id(kobj)];
+		&mbochs_types[mtype_get_type_group_id(mtype)];
 
 	return sprintf(buf, "virtual display, %d MB video memory\n",
 		       type ? type->mbytes  : 0);
 }
 static MDEV_TYPE_ATTR_RO(description);
 
-static ssize_t
-available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
 	const struct mbochs_type *type =
-		&mbochs_types[mtype_get_type_group_id(kobj)];
+		&mbochs_types[mtype_get_type_group_id(mtype)];
 	int count = (max_mbytes - mbochs_used_mbytes) / type->mbytes;
 
 	return sprintf(buf, "%d\n", count);
 }
 static MDEV_TYPE_ATTR_RO(available_instances);
 
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-			       char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
 }
diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c
index da88fd7dd42329..885b88ea20e234 100644
--- a/samples/vfio-mdev/mdpy.c
+++ b/samples/vfio-mdev/mdpy.c
@@ -652,18 +652,21 @@ static const struct attribute_group *mdev_dev_groups[] = {
 	NULL,
 };
 
-static ssize_t
-name_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t name_show(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%s\n", kobj->name);
+	const struct mdpy_type *type =
+		&mdpy_types[mtype_get_type_group_id(mtype)];
+
+	return sprintf(buf, "%s\n", type->name);
 }
 static MDEV_TYPE_ATTR_RO(name);
 
-static ssize_t
-description_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t description_show(struct mdev_type *mtype,
+				struct mdev_type_attribute *attr, char *buf)
 {
 	const struct mdpy_type *type =
-		&mdpy_types[mtype_get_type_group_id(kobj)];
+		&mdpy_types[mtype_get_type_group_id(mtype)];
 
 	return sprintf(buf, "virtual display, %dx%d framebuffer\n",
 		       type ? type->width  : 0,
@@ -671,15 +674,16 @@ description_show(struct kobject *kobj, struct device *dev, char *buf)
 }
 static MDEV_TYPE_ATTR_RO(description);
 
-static ssize_t
-available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
 	return sprintf(buf, "%d\n", max_devices - mdpy_count);
 }
 static MDEV_TYPE_ATTR_RO(available_instances);
 
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-			       char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
 }
diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
index f2e36c06ac6aa2..b9b24be4abdab7 100644
--- a/samples/vfio-mdev/mtty.c
+++ b/samples/vfio-mdev/mtty.c
@@ -1292,23 +1292,24 @@ static const struct attribute_group *mdev_dev_groups[] = {
 	NULL,
 };
 
-static ssize_t
-name_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t name_show(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, char *buf)
 {
 	static const char *name_str[2] = { "Single port serial",
 					   "Dual port serial" };
 
 	return sysfs_emit(buf, "%s\n",
-			  name_str[mtype_get_type_group_id(kobj)]);
+			  name_str[mtype_get_type_group_id(mtype)]);
 }
 
 static MDEV_TYPE_ATTR_RO(name);
 
-static ssize_t
-available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
 	struct mdev_state *mds;
-	unsigned int ports = mtype_get_type_group_id(kobj) + 1;
+	unsigned int ports = mtype_get_type_group_id(mtype) + 1;
 	int used = 0;
 
 	list_for_each_entry(mds, &mdev_devices_list, next)
@@ -1319,9 +1320,8 @@ available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
 
 static MDEV_TYPE_ATTR_RO(available_instances);
 
-
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-			       char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
 }
-- 
2.31.1

[Intel-gfx] [PATCH v2 18/18] vfio/mdev: Correct the function signatures for the mdev_type_attributes

[Jason Gunthorpe]

The driver core standard is to pass in the properly typed object, the
properly typed attribute and the buffer data. It stems from the root
kobject method:

  ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr,..)

Each subclass of kobject should provide their own function with the same
signature but more specific types, eg struct device uses:

  ssize_t (*show)(struct device *dev, struct device_attribute *attr,..)

In this case the existing signature is:

  ssize_t (*show)(struct kobject *kobj, struct device *dev,..)

Where kobj is a 'struct mdev_type *' and dev is 'mdev_type->parent->dev'.

Change the mdev_type related sysfs attribute functions to:

  ssize_t (*show)(struct mdev_type *mtype, struct mdev_type_attribute *attr,..)

In order to restore type safety and match the driver core standard

There are no current users of 'attr', but if it is ever needed it would be
hard to add in retroactively, so do it now.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/gpu/drm/i915/gvt/gvt.c    | 21 +++++++++++----------
 drivers/s390/cio/vfio_ccw_ops.c   | 15 +++++++++------
 drivers/s390/crypto/vfio_ap_ops.c | 12 +++++++-----
 drivers/vfio/mdev/mdev_core.c     | 14 ++++++++++++--
 drivers/vfio/mdev/mdev_sysfs.c    | 11 ++++++-----
 include/linux/mdev.h              | 11 +++++++----
 samples/vfio-mdev/mbochs.c        | 26 +++++++++++++++-----------
 samples/vfio-mdev/mdpy.c          | 24 ++++++++++++++----------
 samples/vfio-mdev/mtty.c          | 18 +++++++++---------
 9 files changed, 90 insertions(+), 62 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
index 4b47a18e9dfa0f..3703814a669b46 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.c
+++ b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -54,14 +54,15 @@ intel_gvt_find_vgpu_type(struct intel_gvt *gvt, unsigned int type_group_id)
 	return &gvt->types[type_group_id];
 }
 
-static ssize_t available_instances_show(struct kobject *kobj,
-					struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
 	struct intel_vgpu_type *type;
 	unsigned int num = 0;
-	void *gvt = kdev_to_i915(dev)->gvt;
+	void *gvt = kdev_to_i915(mtype_get_parent_dev(mtype))->gvt;
 
-	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(kobj));
+	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(mtype));
 	if (!type)
 		num = 0;
 	else
@@ -70,19 +71,19 @@ static ssize_t available_instances_show(struct kobject *kobj,
 	return sprintf(buf, "%u\n", num);
 }
 
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-		char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
 }
 
-static ssize_t description_show(struct kobject *kobj, struct device *dev,
-		char *buf)
+static ssize_t description_show(struct mdev_type *mtype,
+				struct mdev_type_attribute *attr, char *buf)
 {
 	struct intel_vgpu_type *type;
-	void *gvt = kdev_to_i915(dev)->gvt;
+	void *gvt = kdev_to_i915(mtype_get_parent_dev(mtype))->gvt;
 
-	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(kobj));
+	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(mtype));
 	if (!type)
 		return 0;
 
diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index 10407cf67583c6..491a64c61fff1a 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -71,23 +71,26 @@ static int vfio_ccw_mdev_notifier(struct notifier_block *nb,
 	return NOTIFY_DONE;
 }
 
-static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t name_show(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "I/O subchannel (Non-QDIO)\n");
 }
 static MDEV_TYPE_ATTR_RO(name);
 
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-			       char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_CCW_STRING);
 }
 static MDEV_TYPE_ATTR_RO(device_api);
 
-static ssize_t available_instances_show(struct kobject *kobj,
-					struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
-	struct vfio_ccw_private *private = dev_get_drvdata(dev);
+	struct vfio_ccw_private *private =
+		dev_get_drvdata(mtype_get_parent_dev(mtype));
 
 	return sprintf(buf, "%d\n", atomic_read(&private->avail));
 }
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index d319152dd484a2..0ce00c9311d378 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -366,15 +366,17 @@ static int vfio_ap_mdev_remove(struct mdev_device *mdev)
 	return 0;
 }
 
-static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t name_show(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_AP_MDEV_NAME_HWVIRT);
 }
 
 static MDEV_TYPE_ATTR_RO(name);
 
-static ssize_t available_instances_show(struct kobject *kobj,
-					struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
 	return sprintf(buf, "%d\n",
 		       atomic_read(&matrix_dev->available_instances));
@@ -382,8 +384,8 @@ static ssize_t available_instances_show(struct kobject *kobj,
 
 static MDEV_TYPE_ATTR_RO(available_instances);
 
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-			       char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_AP_STRING);
 }
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 10eff33ce1f263..2a85d6fcb7ddd0 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -47,12 +47,22 @@ EXPORT_SYMBOL(mdev_get_type_group_id);
  * Used in mdev_type_attribute sysfs functions to return the index in the
  * supported_type_groups that the sysfs is called from.
  */
-unsigned int mtype_get_type_group_id(struct kobject *mtype_kobj)
+unsigned int mtype_get_type_group_id(struct mdev_type *mtype)
 {
-	return container_of(mtype_kobj, struct mdev_type, kobj)->type_group_id;
+	return mtype->type_group_id;
 }
 EXPORT_SYMBOL(mtype_get_type_group_id);
 
+/*
+ * Used in mdev_type_attribute sysfs functions to return the parent struct
+ * device
+ */
+struct device *mtype_get_parent_dev(struct mdev_type *mtype)
+{
+	return mtype->parent->dev;
+}
+EXPORT_SYMBOL(mtype_get_parent_dev);
+
 /* Should be called holding parent_list_lock */
 static struct mdev_parent *__find_parent_device(struct device *dev)
 {
diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index 712fbc78b12e2d..f5cf1931c54e48 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -26,7 +26,7 @@ static ssize_t mdev_type_attr_show(struct kobject *kobj,
 	ssize_t ret = -EIO;
 
 	if (attr->show)
-		ret = attr->show(kobj, type->parent->dev, buf);
+		ret = attr->show(type, attr, buf);
 	return ret;
 }
 
@@ -39,7 +39,7 @@ static ssize_t mdev_type_attr_store(struct kobject *kobj,
 	ssize_t ret = -EIO;
 
 	if (attr->store)
-		ret = attr->store(&type->kobj, type->parent->dev, buf, count);
+		ret = attr->store(type, attr, buf, count);
 	return ret;
 }
 
@@ -48,8 +48,9 @@ static const struct sysfs_ops mdev_type_sysfs_ops = {
 	.store = mdev_type_attr_store,
 };
 
-static ssize_t create_store(struct kobject *kobj, struct device *dev,
-			    const char *buf, size_t count)
+static ssize_t create_store(struct mdev_type *mtype,
+			    struct mdev_type_attribute *attr, const char *buf,
+			    size_t count)
 {
 	char *str;
 	guid_t uuid;
@@ -67,7 +68,7 @@ static ssize_t create_store(struct kobject *kobj, struct device *dev,
 	if (ret)
 		return ret;
 
-	ret = mdev_device_create(to_mdev_type(kobj), &uuid);
+	ret = mdev_device_create(mtype, &uuid);
 	if (ret)
 		return ret;
 
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index c3a800051d6146..1fb34ea394ad46 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -47,7 +47,8 @@ static inline struct device *mdev_get_iommu_device(struct mdev_device *mdev)
 }
 
 unsigned int mdev_get_type_group_id(struct mdev_device *mdev);
-unsigned int mtype_get_type_group_id(struct kobject *mtype_kobj);
+unsigned int mtype_get_type_group_id(struct mdev_type *mtype);
+struct device *mtype_get_parent_dev(struct mdev_type *mtype);
 
 /**
  * struct mdev_parent_ops - Structure to be registered for each parent device to
@@ -123,9 +124,11 @@ struct mdev_parent_ops {
 /* interface for exporting mdev supported type attributes */
 struct mdev_type_attribute {
 	struct attribute attr;
-	ssize_t (*show)(struct kobject *kobj, struct device *dev, char *buf);
-	ssize_t (*store)(struct kobject *kobj, struct device *dev,
-			 const char *buf, size_t count);
+	ssize_t (*show)(struct mdev_type *mtype,
+			struct mdev_type_attribute *attr, char *buf);
+	ssize_t (*store)(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, const char *buf,
+			 size_t count);
 };
 
 #define MDEV_TYPE_ATTR(_name, _mode, _show, _store)		\
diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index ac4d0dc2490705..861c76914e7639 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -1330,37 +1330,41 @@ static const struct attribute_group *mdev_dev_groups[] = {
 	NULL,
 };
 
-static ssize_t
-name_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t name_show(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%s\n", kobj->name);
+	const struct mbochs_type *type =
+		&mbochs_types[mtype_get_type_group_id(mtype)];
+
+	return sprintf(buf, "%s\n", type->name);
 }
 static MDEV_TYPE_ATTR_RO(name);
 
-static ssize_t
-description_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t description_show(struct mdev_type *mtype,
+				struct mdev_type_attribute *attr, char *buf)
 {
 	const struct mbochs_type *type =
-		&mbochs_types[mtype_get_type_group_id(kobj)];
+		&mbochs_types[mtype_get_type_group_id(mtype)];
 
 	return sprintf(buf, "virtual display, %d MB video memory\n",
 		       type ? type->mbytes  : 0);
 }
 static MDEV_TYPE_ATTR_RO(description);
 
-static ssize_t
-available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
 	const struct mbochs_type *type =
-		&mbochs_types[mtype_get_type_group_id(kobj)];
+		&mbochs_types[mtype_get_type_group_id(mtype)];
 	int count = (max_mbytes - mbochs_used_mbytes) / type->mbytes;
 
 	return sprintf(buf, "%d\n", count);
 }
 static MDEV_TYPE_ATTR_RO(available_instances);
 
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-			       char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
 }
diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c
index da88fd7dd42329..885b88ea20e234 100644
--- a/samples/vfio-mdev/mdpy.c
+++ b/samples/vfio-mdev/mdpy.c
@@ -652,18 +652,21 @@ static const struct attribute_group *mdev_dev_groups[] = {
 	NULL,
 };
 
-static ssize_t
-name_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t name_show(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%s\n", kobj->name);
+	const struct mdpy_type *type =
+		&mdpy_types[mtype_get_type_group_id(mtype)];
+
+	return sprintf(buf, "%s\n", type->name);
 }
 static MDEV_TYPE_ATTR_RO(name);
 
-static ssize_t
-description_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t description_show(struct mdev_type *mtype,
+				struct mdev_type_attribute *attr, char *buf)
 {
 	const struct mdpy_type *type =
-		&mdpy_types[mtype_get_type_group_id(kobj)];
+		&mdpy_types[mtype_get_type_group_id(mtype)];
 
 	return sprintf(buf, "virtual display, %dx%d framebuffer\n",
 		       type ? type->width  : 0,
@@ -671,15 +674,16 @@ description_show(struct kobject *kobj, struct device *dev, char *buf)
 }
 static MDEV_TYPE_ATTR_RO(description);
 
-static ssize_t
-available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
 	return sprintf(buf, "%d\n", max_devices - mdpy_count);
 }
 static MDEV_TYPE_ATTR_RO(available_instances);
 
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-			       char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
 }
diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
index f2e36c06ac6aa2..b9b24be4abdab7 100644
--- a/samples/vfio-mdev/mtty.c
+++ b/samples/vfio-mdev/mtty.c
@@ -1292,23 +1292,24 @@ static const struct attribute_group *mdev_dev_groups[] = {
 	NULL,
 };
 
-static ssize_t
-name_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t name_show(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, char *buf)
 {
 	static const char *name_str[2] = { "Single port serial",
 					   "Dual port serial" };
 
 	return sysfs_emit(buf, "%s\n",
-			  name_str[mtype_get_type_group_id(kobj)]);
+			  name_str[mtype_get_type_group_id(mtype)]);
 }
 
 static MDEV_TYPE_ATTR_RO(name);
 
-static ssize_t
-available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
 	struct mdev_state *mds;
-	unsigned int ports = mtype_get_type_group_id(kobj) + 1;
+	unsigned int ports = mtype_get_type_group_id(mtype) + 1;
 	int used = 0;
 
 	list_for_each_entry(mds, &mdev_devices_list, next)
@@ -1319,9 +1320,8 @@ available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
 
 static MDEV_TYPE_ATTR_RO(available_instances);
 
-
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-			       char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
 }
-- 
2.31.1

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[PATCH v2 18/18] vfio/mdev: Correct the function signatures for the mdev_type_attributes

[Jason Gunthorpe]

The driver core standard is to pass in the properly typed object, the
properly typed attribute and the buffer data. It stems from the root
kobject method:

  ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr,..)

Each subclass of kobject should provide their own function with the same
signature but more specific types, eg struct device uses:

  ssize_t (*show)(struct device *dev, struct device_attribute *attr,..)

In this case the existing signature is:

  ssize_t (*show)(struct kobject *kobj, struct device *dev,..)

Where kobj is a 'struct mdev_type *' and dev is 'mdev_type->parent->dev'.

Change the mdev_type related sysfs attribute functions to:

  ssize_t (*show)(struct mdev_type *mtype, struct mdev_type_attribute *attr,..)

In order to restore type safety and match the driver core standard

There are no current users of 'attr', but if it is ever needed it would be
hard to add in retroactively, so do it now.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/gpu/drm/i915/gvt/gvt.c    | 21 +++++++++++----------
 drivers/s390/cio/vfio_ccw_ops.c   | 15 +++++++++------
 drivers/s390/crypto/vfio_ap_ops.c | 12 +++++++-----
 drivers/vfio/mdev/mdev_core.c     | 14 ++++++++++++--
 drivers/vfio/mdev/mdev_sysfs.c    | 11 ++++++-----
 include/linux/mdev.h              | 11 +++++++----
 samples/vfio-mdev/mbochs.c        | 26 +++++++++++++++-----------
 samples/vfio-mdev/mdpy.c          | 24 ++++++++++++++----------
 samples/vfio-mdev/mtty.c          | 18 +++++++++---------
 9 files changed, 90 insertions(+), 62 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
index 4b47a18e9dfa0f..3703814a669b46 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.c
+++ b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -54,14 +54,15 @@ intel_gvt_find_vgpu_type(struct intel_gvt *gvt, unsigned int type_group_id)
 	return &gvt->types[type_group_id];
 }
 
-static ssize_t available_instances_show(struct kobject *kobj,
-					struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
 	struct intel_vgpu_type *type;
 	unsigned int num = 0;
-	void *gvt = kdev_to_i915(dev)->gvt;
+	void *gvt = kdev_to_i915(mtype_get_parent_dev(mtype))->gvt;
 
-	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(kobj));
+	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(mtype));
 	if (!type)
 		num = 0;
 	else
@@ -70,19 +71,19 @@ static ssize_t available_instances_show(struct kobject *kobj,
 	return sprintf(buf, "%u\n", num);
 }
 
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-		char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
 }
 
-static ssize_t description_show(struct kobject *kobj, struct device *dev,
-		char *buf)
+static ssize_t description_show(struct mdev_type *mtype,
+				struct mdev_type_attribute *attr, char *buf)
 {
 	struct intel_vgpu_type *type;
-	void *gvt = kdev_to_i915(dev)->gvt;
+	void *gvt = kdev_to_i915(mtype_get_parent_dev(mtype))->gvt;
 
-	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(kobj));
+	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(mtype));
 	if (!type)
 		return 0;
 
diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index 10407cf67583c6..491a64c61fff1a 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -71,23 +71,26 @@ static int vfio_ccw_mdev_notifier(struct notifier_block *nb,
 	return NOTIFY_DONE;
 }
 
-static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t name_show(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "I/O subchannel (Non-QDIO)\n");
 }
 static MDEV_TYPE_ATTR_RO(name);
 
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-			       char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_CCW_STRING);
 }
 static MDEV_TYPE_ATTR_RO(device_api);
 
-static ssize_t available_instances_show(struct kobject *kobj,
-					struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
-	struct vfio_ccw_private *private = dev_get_drvdata(dev);
+	struct vfio_ccw_private *private =
+		dev_get_drvdata(mtype_get_parent_dev(mtype));
 
 	return sprintf(buf, "%d\n", atomic_read(&private->avail));
 }
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index d319152dd484a2..0ce00c9311d378 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -366,15 +366,17 @@ static int vfio_ap_mdev_remove(struct mdev_device *mdev)
 	return 0;
 }
 
-static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t name_show(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_AP_MDEV_NAME_HWVIRT);
 }
 
 static MDEV_TYPE_ATTR_RO(name);
 
-static ssize_t available_instances_show(struct kobject *kobj,
-					struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
 	return sprintf(buf, "%d\n",
 		       atomic_read(&matrix_dev->available_instances));
@@ -382,8 +384,8 @@ static ssize_t available_instances_show(struct kobject *kobj,
 
 static MDEV_TYPE_ATTR_RO(available_instances);
 
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-			       char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_AP_STRING);
 }
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 10eff33ce1f263..2a85d6fcb7ddd0 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -47,12 +47,22 @@ EXPORT_SYMBOL(mdev_get_type_group_id);
  * Used in mdev_type_attribute sysfs functions to return the index in the
  * supported_type_groups that the sysfs is called from.
  */
-unsigned int mtype_get_type_group_id(struct kobject *mtype_kobj)
+unsigned int mtype_get_type_group_id(struct mdev_type *mtype)
 {
-	return container_of(mtype_kobj, struct mdev_type, kobj)->type_group_id;
+	return mtype->type_group_id;
 }
 EXPORT_SYMBOL(mtype_get_type_group_id);
 
+/*
+ * Used in mdev_type_attribute sysfs functions to return the parent struct
+ * device
+ */
+struct device *mtype_get_parent_dev(struct mdev_type *mtype)
+{
+	return mtype->parent->dev;
+}
+EXPORT_SYMBOL(mtype_get_parent_dev);
+
 /* Should be called holding parent_list_lock */
 static struct mdev_parent *__find_parent_device(struct device *dev)
 {
diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index 712fbc78b12e2d..f5cf1931c54e48 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -26,7 +26,7 @@ static ssize_t mdev_type_attr_show(struct kobject *kobj,
 	ssize_t ret = -EIO;
 
 	if (attr->show)
-		ret = attr->show(kobj, type->parent->dev, buf);
+		ret = attr->show(type, attr, buf);
 	return ret;
 }
 
@@ -39,7 +39,7 @@ static ssize_t mdev_type_attr_store(struct kobject *kobj,
 	ssize_t ret = -EIO;
 
 	if (attr->store)
-		ret = attr->store(&type->kobj, type->parent->dev, buf, count);
+		ret = attr->store(type, attr, buf, count);
 	return ret;
 }
 
@@ -48,8 +48,9 @@ static const struct sysfs_ops mdev_type_sysfs_ops = {
 	.store = mdev_type_attr_store,
 };
 
-static ssize_t create_store(struct kobject *kobj, struct device *dev,
-			    const char *buf, size_t count)
+static ssize_t create_store(struct mdev_type *mtype,
+			    struct mdev_type_attribute *attr, const char *buf,
+			    size_t count)
 {
 	char *str;
 	guid_t uuid;
@@ -67,7 +68,7 @@ static ssize_t create_store(struct kobject *kobj, struct device *dev,
 	if (ret)
 		return ret;
 
-	ret = mdev_device_create(to_mdev_type(kobj), &uuid);
+	ret = mdev_device_create(mtype, &uuid);
 	if (ret)
 		return ret;
 
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index c3a800051d6146..1fb34ea394ad46 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -47,7 +47,8 @@ static inline struct device *mdev_get_iommu_device(struct mdev_device *mdev)
 }
 
 unsigned int mdev_get_type_group_id(struct mdev_device *mdev);
-unsigned int mtype_get_type_group_id(struct kobject *mtype_kobj);
+unsigned int mtype_get_type_group_id(struct mdev_type *mtype);
+struct device *mtype_get_parent_dev(struct mdev_type *mtype);
 
 /**
  * struct mdev_parent_ops - Structure to be registered for each parent device to
@@ -123,9 +124,11 @@ struct mdev_parent_ops {
 /* interface for exporting mdev supported type attributes */
 struct mdev_type_attribute {
 	struct attribute attr;
-	ssize_t (*show)(struct kobject *kobj, struct device *dev, char *buf);
-	ssize_t (*store)(struct kobject *kobj, struct device *dev,
-			 const char *buf, size_t count);
+	ssize_t (*show)(struct mdev_type *mtype,
+			struct mdev_type_attribute *attr, char *buf);
+	ssize_t (*store)(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, const char *buf,
+			 size_t count);
 };
 
 #define MDEV_TYPE_ATTR(_name, _mode, _show, _store)		\
diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index ac4d0dc2490705..861c76914e7639 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -1330,37 +1330,41 @@ static const struct attribute_group *mdev_dev_groups[] = {
 	NULL,
 };
 
-static ssize_t
-name_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t name_show(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%s\n", kobj->name);
+	const struct mbochs_type *type =
+		&mbochs_types[mtype_get_type_group_id(mtype)];
+
+	return sprintf(buf, "%s\n", type->name);
 }
 static MDEV_TYPE_ATTR_RO(name);
 
-static ssize_t
-description_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t description_show(struct mdev_type *mtype,
+				struct mdev_type_attribute *attr, char *buf)
 {
 	const struct mbochs_type *type =
-		&mbochs_types[mtype_get_type_group_id(kobj)];
+		&mbochs_types[mtype_get_type_group_id(mtype)];
 
 	return sprintf(buf, "virtual display, %d MB video memory\n",
 		       type ? type->mbytes  : 0);
 }
 static MDEV_TYPE_ATTR_RO(description);
 
-static ssize_t
-available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
 	const struct mbochs_type *type =
-		&mbochs_types[mtype_get_type_group_id(kobj)];
+		&mbochs_types[mtype_get_type_group_id(mtype)];
 	int count = (max_mbytes - mbochs_used_mbytes) / type->mbytes;
 
 	return sprintf(buf, "%d\n", count);
 }
 static MDEV_TYPE_ATTR_RO(available_instances);
 
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-			       char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
 }
diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c
index da88fd7dd42329..885b88ea20e234 100644
--- a/samples/vfio-mdev/mdpy.c
+++ b/samples/vfio-mdev/mdpy.c
@@ -652,18 +652,21 @@ static const struct attribute_group *mdev_dev_groups[] = {
 	NULL,
 };
 
-static ssize_t
-name_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t name_show(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%s\n", kobj->name);
+	const struct mdpy_type *type =
+		&mdpy_types[mtype_get_type_group_id(mtype)];
+
+	return sprintf(buf, "%s\n", type->name);
 }
 static MDEV_TYPE_ATTR_RO(name);
 
-static ssize_t
-description_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t description_show(struct mdev_type *mtype,
+				struct mdev_type_attribute *attr, char *buf)
 {
 	const struct mdpy_type *type =
-		&mdpy_types[mtype_get_type_group_id(kobj)];
+		&mdpy_types[mtype_get_type_group_id(mtype)];
 
 	return sprintf(buf, "virtual display, %dx%d framebuffer\n",
 		       type ? type->width  : 0,
@@ -671,15 +674,16 @@ description_show(struct kobject *kobj, struct device *dev, char *buf)
 }
 static MDEV_TYPE_ATTR_RO(description);
 
-static ssize_t
-available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
 	return sprintf(buf, "%d\n", max_devices - mdpy_count);
 }
 static MDEV_TYPE_ATTR_RO(available_instances);
 
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-			       char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
 }
diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
index f2e36c06ac6aa2..b9b24be4abdab7 100644
--- a/samples/vfio-mdev/mtty.c
+++ b/samples/vfio-mdev/mtty.c
@@ -1292,23 +1292,24 @@ static const struct attribute_group *mdev_dev_groups[] = {
 	NULL,
 };
 
-static ssize_t
-name_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t name_show(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, char *buf)
 {
 	static const char *name_str[2] = { "Single port serial",
 					   "Dual port serial" };
 
 	return sysfs_emit(buf, "%s\n",
-			  name_str[mtype_get_type_group_id(kobj)]);
+			  name_str[mtype_get_type_group_id(mtype)]);
 }
 
 static MDEV_TYPE_ATTR_RO(name);
 
-static ssize_t
-available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
+static ssize_t available_instances_show(struct mdev_type *mtype,
+					struct mdev_type_attribute *attr,
+					char *buf)
 {
 	struct mdev_state *mds;
-	unsigned int ports = mtype_get_type_group_id(kobj) + 1;
+	unsigned int ports = mtype_get_type_group_id(mtype) + 1;
 	int used = 0;
 
 	list_for_each_entry(mds, &mdev_devices_list, next)
@@ -1319,9 +1320,8 @@ available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
 
 static MDEV_TYPE_ATTR_RO(available_instances);
 
-
-static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
-			       char *buf)
+static ssize_t device_api_show(struct mdev_type *mtype,
+			       struct mdev_type_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
 }
-- 
2.31.1

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Re: [PATCH v2 00/18] Make vfio_mdev type safe

[Alex Williamson]

On Tue,  6 Apr 2021 16:40:23 -0300
Jason Gunthorpe <jgg@nvidia.com> wrote:

> vfio_mdev has a number of different objects: mdev_parent, mdev_type and
> mdev_device.
> 
> Unfortunately the types of these have been erased in various places
> throughout the API, and this makes it very hard to understand this code or
> maintain it by the time it reaches all of the drivers.
> 
> This series puts in all the types and aligns some of the design with the
> driver core standard for a driver core bus driver:
> 
>  - Replace 'struct device *' with 'struct mdev_device *
>  - Replace 'struct device *' with 'struct mdev_type *' and
>    mtype_get_parent_dev()
>  - Replace 'struct kobject *' with 'struct mdev_type *'
> 
> Now that types are clear it is easy to spot a few places that have
> duplicated information.
> 
> More significantly we can now understand how to directly fix the
> obfuscated 'kobj->name' matching by realizing the the kobj is a mdev_type,
> which is linked to the supported_types_list provided by the driver, and
> thus the core code can directly return the array indexes all the drivers
> actually want.
> 
> v2:
>  - Use a mdev_type local in mdev_create_sysfs_files
>  - Rename the goto unwind labels in mdev_device_free()
>  - Reorder patches, annotate reviewed-by's thanks all
> v1: https://lore.kernel.org/r/0-v1-7dedf20b2b75+4f785-vfio2_jgg@nvidia.com
> 
> Jason Gunthorpe (18):
>   vfio/mdev: Fix missing static's on MDEV_TYPE_ATTR's
>   vfio/mdev: Do not allow a mdev_type to have a NULL parent pointer
>   vfio/mdev: Add missing typesafety around mdev_device
>   vfio/mdev: Simplify driver registration
>   vfio/mdev: Use struct mdev_type in struct mdev_device
>   vfio/mdev: Expose mdev_get/put_parent to mdev_private.h
>   vfio/mdev: Add missing reference counting to mdev_type
>   vfio/mdev: Reorganize mdev_device_create()
>   vfio/mdev: Add missing error handling to dev_set_name()
>   vfio/mdev: Remove duplicate storage of parent in mdev_device
>   vfio/mdev: Add mdev/mtype_get_type_group_id()
>   vfio/mtty: Use mdev_get_type_group_id()
>   vfio/mdpy: Use mdev_get_type_group_id()
>   vfio/mbochs: Use mdev_get_type_group_id()
>   vfio/gvt: Make DRM_I915_GVT depend on VFIO_MDEV
>   vfio/gvt: Use mdev_get_type_group_id()
>   vfio/mdev: Remove kobj from mdev_parent_ops->create()
>   vfio/mdev: Correct the function signatures for the
>     mdev_type_attributes
> 
>  .../driver-api/vfio-mediated-device.rst       |   9 +-
>  drivers/gpu/drm/i915/Kconfig                  |   1 +
>  drivers/gpu/drm/i915/gvt/gvt.c                |  41 ++---
>  drivers/gpu/drm/i915/gvt/gvt.h                |   4 +-
>  drivers/gpu/drm/i915/gvt/kvmgt.c              |   7 +-
>  drivers/s390/cio/vfio_ccw_ops.c               |  17 +-
>  drivers/s390/crypto/vfio_ap_ops.c             |  14 +-
>  drivers/vfio/mdev/mdev_core.c                 | 174 +++++++-----------
>  drivers/vfio/mdev/mdev_driver.c               |  19 +-
>  drivers/vfio/mdev/mdev_private.h              |  40 ++--
>  drivers/vfio/mdev/mdev_sysfs.c                |  59 +++---
>  drivers/vfio/mdev/vfio_mdev.c                 |  29 +--
>  drivers/vfio/vfio_iommu_type1.c               |  25 +--
>  include/linux/mdev.h                          |  80 +++++---
>  samples/vfio-mdev/mbochs.c                    |  55 +++---
>  samples/vfio-mdev/mdpy.c                      |  56 +++---
>  samples/vfio-mdev/mtty.c                      |  66 ++-----
>  17 files changed, 313 insertions(+), 383 deletions(-)

Applied to vfio next branch for v5.13.  Thanks!

Alex

Re: [Intel-gfx] [PATCH v2 00/18] Make vfio_mdev type safe

[Alex Williamson]

On Tue,  6 Apr 2021 16:40:23 -0300
Jason Gunthorpe <jgg@nvidia.com> wrote:

> vfio_mdev has a number of different objects: mdev_parent, mdev_type and
> mdev_device.
> 
> Unfortunately the types of these have been erased in various places
> throughout the API, and this makes it very hard to understand this code or
> maintain it by the time it reaches all of the drivers.
> 
> This series puts in all the types and aligns some of the design with the
> driver core standard for a driver core bus driver:
> 
>  - Replace 'struct device *' with 'struct mdev_device *
>  - Replace 'struct device *' with 'struct mdev_type *' and
>    mtype_get_parent_dev()
>  - Replace 'struct kobject *' with 'struct mdev_type *'
> 
> Now that types are clear it is easy to spot a few places that have
> duplicated information.
> 
> More significantly we can now understand how to directly fix the
> obfuscated 'kobj->name' matching by realizing the the kobj is a mdev_type,
> which is linked to the supported_types_list provided by the driver, and
> thus the core code can directly return the array indexes all the drivers
> actually want.
> 
> v2:
>  - Use a mdev_type local in mdev_create_sysfs_files
>  - Rename the goto unwind labels in mdev_device_free()
>  - Reorder patches, annotate reviewed-by's thanks all
> v1: https://lore.kernel.org/r/0-v1-7dedf20b2b75+4f785-vfio2_jgg@nvidia.com
> 
> Jason Gunthorpe (18):
>   vfio/mdev: Fix missing static's on MDEV_TYPE_ATTR's
>   vfio/mdev: Do not allow a mdev_type to have a NULL parent pointer
>   vfio/mdev: Add missing typesafety around mdev_device
>   vfio/mdev: Simplify driver registration
>   vfio/mdev: Use struct mdev_type in struct mdev_device
>   vfio/mdev: Expose mdev_get/put_parent to mdev_private.h
>   vfio/mdev: Add missing reference counting to mdev_type
>   vfio/mdev: Reorganize mdev_device_create()
>   vfio/mdev: Add missing error handling to dev_set_name()
>   vfio/mdev: Remove duplicate storage of parent in mdev_device
>   vfio/mdev: Add mdev/mtype_get_type_group_id()
>   vfio/mtty: Use mdev_get_type_group_id()
>   vfio/mdpy: Use mdev_get_type_group_id()
>   vfio/mbochs: Use mdev_get_type_group_id()
>   vfio/gvt: Make DRM_I915_GVT depend on VFIO_MDEV
>   vfio/gvt: Use mdev_get_type_group_id()
>   vfio/mdev: Remove kobj from mdev_parent_ops->create()
>   vfio/mdev: Correct the function signatures for the
>     mdev_type_attributes
> 
>  .../driver-api/vfio-mediated-device.rst       |   9 +-
>  drivers/gpu/drm/i915/Kconfig                  |   1 +
>  drivers/gpu/drm/i915/gvt/gvt.c                |  41 ++---
>  drivers/gpu/drm/i915/gvt/gvt.h                |   4 +-
>  drivers/gpu/drm/i915/gvt/kvmgt.c              |   7 +-
>  drivers/s390/cio/vfio_ccw_ops.c               |  17 +-
>  drivers/s390/crypto/vfio_ap_ops.c             |  14 +-
>  drivers/vfio/mdev/mdev_core.c                 | 174 +++++++-----------
>  drivers/vfio/mdev/mdev_driver.c               |  19 +-
>  drivers/vfio/mdev/mdev_private.h              |  40 ++--
>  drivers/vfio/mdev/mdev_sysfs.c                |  59 +++---
>  drivers/vfio/mdev/vfio_mdev.c                 |  29 +--
>  drivers/vfio/vfio_iommu_type1.c               |  25 +--
>  include/linux/mdev.h                          |  80 +++++---
>  samples/vfio-mdev/mbochs.c                    |  55 +++---
>  samples/vfio-mdev/mdpy.c                      |  56 +++---
>  samples/vfio-mdev/mtty.c                      |  66 ++-----
>  17 files changed, 313 insertions(+), 383 deletions(-)

Applied to vfio next branch for v5.13.  Thanks!

Alex

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Re: [PATCH v2 00/18] Make vfio_mdev type safe

[Alex Williamson]

On Tue,  6 Apr 2021 16:40:23 -0300
Jason Gunthorpe <jgg@nvidia.com> wrote:

> vfio_mdev has a number of different objects: mdev_parent, mdev_type and
> mdev_device.
> 
> Unfortunately the types of these have been erased in various places
> throughout the API, and this makes it very hard to understand this code or
> maintain it by the time it reaches all of the drivers.
> 
> This series puts in all the types and aligns some of the design with the
> driver core standard for a driver core bus driver:
> 
>  - Replace 'struct device *' with 'struct mdev_device *
>  - Replace 'struct device *' with 'struct mdev_type *' and
>    mtype_get_parent_dev()
>  - Replace 'struct kobject *' with 'struct mdev_type *'
> 
> Now that types are clear it is easy to spot a few places that have
> duplicated information.
> 
> More significantly we can now understand how to directly fix the
> obfuscated 'kobj->name' matching by realizing the the kobj is a mdev_type,
> which is linked to the supported_types_list provided by the driver, and
> thus the core code can directly return the array indexes all the drivers
> actually want.
> 
> v2:
>  - Use a mdev_type local in mdev_create_sysfs_files
>  - Rename the goto unwind labels in mdev_device_free()
>  - Reorder patches, annotate reviewed-by's thanks all
> v1: https://lore.kernel.org/r/0-v1-7dedf20b2b75+4f785-vfio2_jgg@nvidia.com
> 
> Jason Gunthorpe (18):
>   vfio/mdev: Fix missing static's on MDEV_TYPE_ATTR's
>   vfio/mdev: Do not allow a mdev_type to have a NULL parent pointer
>   vfio/mdev: Add missing typesafety around mdev_device
>   vfio/mdev: Simplify driver registration
>   vfio/mdev: Use struct mdev_type in struct mdev_device
>   vfio/mdev: Expose mdev_get/put_parent to mdev_private.h
>   vfio/mdev: Add missing reference counting to mdev_type
>   vfio/mdev: Reorganize mdev_device_create()
>   vfio/mdev: Add missing error handling to dev_set_name()
>   vfio/mdev: Remove duplicate storage of parent in mdev_device
>   vfio/mdev: Add mdev/mtype_get_type_group_id()
>   vfio/mtty: Use mdev_get_type_group_id()
>   vfio/mdpy: Use mdev_get_type_group_id()
>   vfio/mbochs: Use mdev_get_type_group_id()
>   vfio/gvt: Make DRM_I915_GVT depend on VFIO_MDEV
>   vfio/gvt: Use mdev_get_type_group_id()
>   vfio/mdev: Remove kobj from mdev_parent_ops->create()
>   vfio/mdev: Correct the function signatures for the
>     mdev_type_attributes
> 
>  .../driver-api/vfio-mediated-device.rst       |   9 +-
>  drivers/gpu/drm/i915/Kconfig                  |   1 +
>  drivers/gpu/drm/i915/gvt/gvt.c                |  41 ++---
>  drivers/gpu/drm/i915/gvt/gvt.h                |   4 +-
>  drivers/gpu/drm/i915/gvt/kvmgt.c              |   7 +-
>  drivers/s390/cio/vfio_ccw_ops.c               |  17 +-
>  drivers/s390/crypto/vfio_ap_ops.c             |  14 +-
>  drivers/vfio/mdev/mdev_core.c                 | 174 +++++++-----------
>  drivers/vfio/mdev/mdev_driver.c               |  19 +-
>  drivers/vfio/mdev/mdev_private.h              |  40 ++--
>  drivers/vfio/mdev/mdev_sysfs.c                |  59 +++---
>  drivers/vfio/mdev/vfio_mdev.c                 |  29 +--
>  drivers/vfio/vfio_iommu_type1.c               |  25 +--
>  include/linux/mdev.h                          |  80 +++++---
>  samples/vfio-mdev/mbochs.c                    |  55 +++---
>  samples/vfio-mdev/mdpy.c                      |  56 +++---
>  samples/vfio-mdev/mtty.c                      |  66 ++-----
>  17 files changed, 313 insertions(+), 383 deletions(-)

Applied to vfio next branch for v5.13.  Thanks!

Alex

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