From: Kevin Tian <kevin.tian@intel.com>
To: Zhenyu Wang <zhenyuw@linux.intel.com>,
Zhi Wang <zhi.a.wang@intel.com>,
Jani Nikula <jani.nikula@linux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@intel.com>,
Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Eric Farman <farman@linux.ibm.com>,
Matthew Rosato <mjrosato@linux.ibm.com>,
Halil Pasic <pasic@linux.ibm.com>,
Vineeth Vijayan <vneethv@linux.ibm.com>,
Peter Oberparleiter <oberpar@linux.ibm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>,
Tony Krowiak <akrowiak@linux.ibm.com>,
Jason Herne <jjherne@linux.ibm.com>,
Harald Freudenberger <freude@linux.ibm.com>,
Diana Craciun <diana.craciun@oss.nxp.com>,
Alex Williamson <alex.williamson@redhat.com>,
Cornelia Huck <cohuck@redhat.com>,
Longfang Liu <liulongfang@huawei.com>,
Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>,
Jason Gunthorpe <jgg@ziepe.ca>, Yishai Hadas <yishaih@nvidia.com>,
Kevin Tian <kevin.tian@intel.com>,
Eric Auger <eric.auger@redhat.com>,
Kirti Wankhede <kwankhede@nvidia.com>,
Leon Romanovsky <leon@kernel.org>,
Abhishek Sahu <abhsahu@nvidia.com>,
intel-gvt-dev@lists.freedesktop.org,
intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org,
kvm@vger.kernel.org
Cc: Yi Liu <yi.l.liu@intel.com>
Subject: [PATCH v2 15/15] vfio: Add struct device to vfio_device
Date: Thu, 1 Sep 2022 22:37:47 +0800 [thread overview]
Message-ID: <20220901143747.32858-16-kevin.tian@intel.com> (raw)
In-Reply-To: <20220901143747.32858-1-kevin.tian@intel.com>
From: Yi Liu <yi.l.liu@intel.com>
and replace kref. With it a 'vfio-dev/vfioX' node is created under the
sysfs path of the parent, indicating the device is bound to a vfio
driver, e.g.:
/sys/devices/pci0000\:6f/0000\:6f\:01.0/vfio-dev/vfio0
It is also a preparatory step toward adding cdev for supporting future
device-oriented uAPI.
Add Documentation/ABI/testing/sysfs-devices-vfio-dev.
Also take this chance to rename chardev 'vfio' to 'vfio-group' in
/proc/devices.
Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
---
.../ABI/testing/sysfs-devices-vfio-dev | 8 +++
drivers/vfio/vfio_main.c | 67 +++++++++++++++----
include/linux/vfio.h | 6 +-
3 files changed, 66 insertions(+), 15 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-devices-vfio-dev
diff --git a/Documentation/ABI/testing/sysfs-devices-vfio-dev b/Documentation/ABI/testing/sysfs-devices-vfio-dev
new file mode 100644
index 000000000000..e21424fd9666
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-devices-vfio-dev
@@ -0,0 +1,8 @@
+What: /sys/.../<device>/vfio-dev/vfioX/
+Date: September 2022
+Contact: Yi Liu <yi.l.liu@intel.com>
+Description:
+ This directory is created when the device is bound to a
+ vfio driver. The layout under this directory matches what
+ exists for a standard 'struct device'. 'X' is a unique
+ index marking this device in vfio.
diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
index bfa675d314ab..141f55c3faf5 100644
--- a/drivers/vfio/vfio_main.c
+++ b/drivers/vfio/vfio_main.c
@@ -46,6 +46,8 @@ static struct vfio {
struct mutex group_lock; /* locks group_list */
struct ida group_ida;
dev_t group_devt;
+ struct class *device_class;
+ struct ida device_ida;
} vfio;
struct vfio_iommu_driver {
@@ -483,12 +485,13 @@ static struct vfio_device *vfio_group_get_device(struct vfio_group *group,
* VFIO driver API
*/
/* Release helper called by vfio_put_device() */
-void vfio_device_release(struct kref *kref)
+static void vfio_device_release(struct device *dev)
{
struct vfio_device *device =
- container_of(kref, struct vfio_device, kref);
+ container_of(dev, struct vfio_device, device);
vfio_release_device_set(device);
+ ida_free(&vfio.device_ida, device->index);
/*
* kvfree() cannot be done here due to a life cycle mess in
@@ -498,7 +501,6 @@ void vfio_device_release(struct kref *kref)
*/
device->ops->release(device);
}
-EXPORT_SYMBOL_GPL(vfio_device_release);
/*
* Alloc and initialize vfio_device so it can be registered to vfio
@@ -546,6 +548,13 @@ int vfio_init_device(struct vfio_device *device, struct device *dev,
{
int ret;
+ ret = ida_alloc_max(&vfio.device_ida, MINORMASK, GFP_KERNEL);
+ if (ret < 0) {
+ dev_dbg(dev, "Error to alloc index\n");
+ return ret;
+ }
+
+ device->index = ret;
init_completion(&device->comp);
device->dev = dev;
device->ops = ops;
@@ -556,11 +565,15 @@ int vfio_init_device(struct vfio_device *device, struct device *dev,
goto out_uninit;
}
- kref_init(&device->kref);
+ device_initialize(&device->device);
+ device->device.release = vfio_device_release;
+ device->device.class = vfio.device_class;
+ device->device.parent = device->dev;
return 0;
out_uninit:
vfio_release_device_set(device);
+ ida_free(&vfio.device_ida, device->index);
return ret;
}
EXPORT_SYMBOL_GPL(vfio_init_device);
@@ -657,6 +670,7 @@ static int __vfio_register_dev(struct vfio_device *device,
struct vfio_group *group)
{
struct vfio_device *existing_device;
+ int ret;
if (IS_ERR(group))
return PTR_ERR(group);
@@ -673,16 +687,21 @@ static int __vfio_register_dev(struct vfio_device *device,
dev_WARN(device->dev, "Device already exists on group %d\n",
iommu_group_id(group->iommu_group));
vfio_device_put_registration(existing_device);
- if (group->type == VFIO_NO_IOMMU ||
- group->type == VFIO_EMULATED_IOMMU)
- iommu_group_remove_device(device->dev);
- vfio_group_put(group);
- return -EBUSY;
+ ret = -EBUSY;
+ goto err_out;
}
/* Our reference on group is moved to the device */
device->group = group;
+ ret = dev_set_name(&device->device, "vfio%d", device->index);
+ if (ret)
+ goto err_out;
+
+ ret = device_add(&device->device);
+ if (ret)
+ goto err_out;
+
/* Refcounting can't start until the driver calls register */
refcount_set(&device->refcount, 1);
@@ -692,6 +711,12 @@ static int __vfio_register_dev(struct vfio_device *device,
mutex_unlock(&group->device_lock);
return 0;
+err_out:
+ if (group->type == VFIO_NO_IOMMU ||
+ group->type == VFIO_EMULATED_IOMMU)
+ iommu_group_remove_device(device->dev);
+ vfio_group_put(group);
+ return ret;
}
int vfio_register_group_dev(struct vfio_device *device)
@@ -779,6 +804,9 @@ void vfio_unregister_group_dev(struct vfio_device *device)
group->dev_counter--;
mutex_unlock(&group->device_lock);
+ /* Balances device_add in register path */
+ device_del(&device->device);
+
if (group->type == VFIO_NO_IOMMU || group->type == VFIO_EMULATED_IOMMU)
iommu_group_remove_device(device->dev);
@@ -2145,6 +2173,7 @@ static int __init vfio_init(void)
int ret;
ida_init(&vfio.group_ida);
+ ida_init(&vfio.device_ida);
mutex_init(&vfio.group_lock);
mutex_init(&vfio.iommu_drivers_lock);
INIT_LIST_HEAD(&vfio.group_list);
@@ -2160,12 +2189,20 @@ static int __init vfio_init(void)
vfio.class = class_create(THIS_MODULE, "vfio");
if (IS_ERR(vfio.class)) {
ret = PTR_ERR(vfio.class);
- goto err_class;
+ goto err_group_class;
}
vfio.class->devnode = vfio_devnode;
- ret = alloc_chrdev_region(&vfio.group_devt, 0, MINORMASK + 1, "vfio");
+ /* /sys/class/vfio-dev/vfioX */
+ vfio.device_class = class_create(THIS_MODULE, "vfio-dev");
+ if (IS_ERR(vfio.device_class)) {
+ ret = PTR_ERR(vfio.device_class);
+ goto err_dev_class;
+ }
+
+ ret = alloc_chrdev_region(&vfio.group_devt, 0, MINORMASK + 1,
+ "vfio-group");
if (ret)
goto err_alloc_chrdev;
@@ -2181,9 +2218,12 @@ static int __init vfio_init(void)
err_driver_register:
unregister_chrdev_region(vfio.group_devt, MINORMASK + 1);
err_alloc_chrdev:
+ class_destroy(vfio.device_class);
+ vfio.device_class = NULL;
+err_dev_class:
class_destroy(vfio.class);
vfio.class = NULL;
-err_class:
+err_group_class:
misc_deregister(&vfio_dev);
return ret;
}
@@ -2195,8 +2235,11 @@ static void __exit vfio_cleanup(void)
#ifdef CONFIG_VFIO_NOIOMMU
vfio_unregister_iommu_driver(&vfio_noiommu_ops);
#endif
+ ida_destroy(&vfio.device_ida);
ida_destroy(&vfio.group_ida);
unregister_chrdev_region(vfio.group_devt, MINORMASK + 1);
+ class_destroy(vfio.device_class);
+ vfio.device_class = NULL;
class_destroy(vfio.class);
vfio.class = NULL;
misc_deregister(&vfio_dev);
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index f03447c8774d..5c13f74da1bb 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -45,7 +45,8 @@ struct vfio_device {
struct kvm *kvm;
/* Members below here are private, not for driver use */
- struct kref kref; /* object life cycle */
+ unsigned int index;
+ struct device device; /* device.kref covers object life circle */
refcount_t refcount; /* user count on registered device*/
unsigned int open_count;
struct completion comp;
@@ -154,10 +155,9 @@ struct vfio_device *_vfio_alloc_device(size_t size, struct device *dev,
int vfio_init_device(struct vfio_device *device, struct device *dev,
const struct vfio_device_ops *ops);
void vfio_free_device(struct vfio_device *device);
-void vfio_device_release(struct kref *kref);
static inline void vfio_put_device(struct vfio_device *device)
{
- kref_put(&device->kref, vfio_device_release);
+ put_device(&device->device);
}
int vfio_register_group_dev(struct vfio_device *device);
--
2.21.3
next prev parent reply other threads:[~2022-09-01 7:20 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-01 14:37 [PATCH v2 00/15] Tidy up vfio_device life cycle Kevin Tian
2022-09-01 14:37 ` [PATCH v2 01/15] vfio: Add helpers for unifying " Kevin Tian
[not found] ` <YxcV05AVN4kqdPX6@infradead.org>
2022-09-07 0:43 ` Tian, Kevin
[not found] ` <YxiGpryRNrxvEoiY@infradead.org>
2022-09-07 12:11 ` Jason Gunthorpe
2022-09-07 19:28 ` Eric Auger
2022-09-08 6:19 ` Tian, Kevin
2022-09-08 9:08 ` Eric Auger
2022-09-01 14:37 ` [PATCH v2 02/15] vfio/pci: Use the new device life cycle helpers Kevin Tian
2022-09-01 14:37 ` [PATCH v2 03/15] vfio/mlx5: " Kevin Tian
2022-09-01 14:37 ` [PATCH v2 04/15] vfio/hisi_acc: " Kevin Tian
2022-09-01 14:37 ` [PATCH v2 05/15] vfio/mdpy: " Kevin Tian
2022-09-01 14:37 ` [PATCH v2 06/15] vfio/mtty: " Kevin Tian
2022-09-01 14:37 ` [PATCH v2 07/15] vfio/mbochs: " Kevin Tian
2022-09-01 14:37 ` [PATCH v2 08/15] drm/i915/gvt: " Kevin Tian
2022-09-07 3:17 ` Zhenyu Wang
2022-09-01 14:37 ` [PATCH v2 09/15] vfio/ap: " Kevin Tian
2022-09-01 14:37 ` [PATCH v2 10/15] vfio/fsl-mc: " Kevin Tian
2022-09-01 14:37 ` [PATCH v2 11/15] vfio/platform: " Kevin Tian
2022-09-07 19:28 ` Eric Auger
2022-09-01 14:37 ` [PATCH v2 12/15] vfio/amba: " Kevin Tian
2022-09-01 7:37 ` Tian, Kevin
2022-09-07 19:32 ` Eric Auger
2022-09-01 14:37 ` [PATCH v2 13/15] vfio/ccw: " Kevin Tian
2022-09-08 7:19 ` Tian, Kevin
2022-09-08 20:50 ` Eric Farman
2022-09-09 1:52 ` Tian, Kevin
2022-09-01 14:37 ` [PATCH v2 14/15] vfio: Rename vfio_device_put() and vfio_device_try_get() Kevin Tian
2022-09-07 19:35 ` Eric Auger
2022-09-01 14:37 ` Kevin Tian [this message]
2022-09-01 7:40 ` [PATCH v2 15/15] vfio: Add struct device to vfio_device Tian, Kevin
2022-09-08 9:06 ` Eric Auger
2022-09-08 9:17 ` Yi Liu
2022-09-08 9:39 ` Eric Auger
2022-09-08 12:37 ` Jason Gunthorpe
2022-09-09 3:09 ` Tian, Kevin
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