* [PATCH v2 08/13] vfio/gvt: Convert to use vfio_register_group_dev()
2021-04-26 20:00 [PATCH v2 00/13] Remove vfio_mdev.c, mdev_parent_ops and more Jason Gunthorpe
2021-04-26 20:00 ` [PATCH v2 01/13] vfio/mdev: Remove CONFIG_VFIO_MDEV_DEVICE Jason Gunthorpe
@ 2021-04-26 20:00 ` Jason Gunthorpe
2021-04-26 20:00 ` [PATCH v2 11/13] vfio/mdev: Remove mdev_parent_ops Jason Gunthorpe
2021-04-27 21:30 ` [PATCH v2 00/13] Remove vfio_mdev.c, mdev_parent_ops and more Alex Williamson
3 siblings, 0 replies; 8+ messages in thread
From: Jason Gunthorpe @ 2021-04-26 20:00 UTC (permalink / raw)
To: David Airlie, Daniel Vetter, dri-devel, intel-gfx, intel-gvt-dev,
Jani Nikula, Joonas Lahtinen, Rodrigo Vivi, Zhenyu Wang,
Zhi Wang
Cc: Max Gurtovoy, Raj, Ashok, Tarun Gupta, Dan Williams,
Leon Romanovsky, Christoph Hellwig
While there is a confusing mess of pointers and structs in this driver,
the struct kvmgt_vdev (which in turn is 1:1 with a struct intel_vgpu) is
what holds the vfio_device. Replace all the drvdata's and weird
derivations of vgpu and vdev with container_of() or vdev->vgpu.
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
drivers/gpu/drm/i915/gvt/kvmgt.c | 208 +++++++++++++++++--------------
1 file changed, 111 insertions(+), 97 deletions(-)
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 6bf176e8426e63..85ef300087e091 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -50,6 +50,7 @@
#include "gvt.h"
static const struct intel_gvt_ops *intel_gvt_ops;
+static const struct vfio_device_ops intel_vgpu_dev_ops;
/* helper macros copied from vfio-pci */
#define VFIO_PCI_OFFSET_SHIFT 40
@@ -109,8 +110,8 @@ struct gvt_dma {
};
struct kvmgt_vdev {
+ struct vfio_device vfio_device;
struct intel_vgpu *vgpu;
- struct mdev_device *mdev;
struct vfio_region *region;
int num_regions;
struct eventfd_ctx *intx_trigger;
@@ -130,7 +131,6 @@ struct kvmgt_vdev {
struct kvm *kvm;
struct work_struct release_work;
atomic_t released;
- struct vfio_device *vfio_device;
struct vfio_group *vfio_group;
};
@@ -144,7 +144,7 @@ static inline bool handle_valid(unsigned long handle)
return !!(handle & ~0xff);
}
-static int kvmgt_guest_init(struct mdev_device *mdev);
+static int kvmgt_guest_init(struct kvmgt_vdev *vdev);
static void intel_vgpu_release_work(struct work_struct *work);
static bool kvmgt_guest_exit(struct kvmgt_guest_info *info);
@@ -611,12 +611,7 @@ static int kvmgt_get_vfio_device(void *p_vgpu)
struct intel_vgpu *vgpu = (struct intel_vgpu *)p_vgpu;
struct kvmgt_vdev *vdev = kvmgt_vdev(vgpu);
- vdev->vfio_device = vfio_device_get_from_dev(
- mdev_dev(vdev->mdev));
- if (!vdev->vfio_device) {
- gvt_vgpu_err("failed to get vfio device\n");
- return -ENODEV;
- }
+ vfio_device_get(&vdev->vfio_device);
return 0;
}
@@ -683,16 +678,14 @@ static void kvmgt_put_vfio_device(void *vgpu)
{
struct kvmgt_vdev *vdev = kvmgt_vdev((struct intel_vgpu *)vgpu);
- if (WARN_ON(!vdev->vfio_device))
- return;
-
- vfio_device_put(vdev->vfio_device);
+ vfio_device_put(&vdev->vfio_device);
}
-static int intel_vgpu_create(struct mdev_device *mdev)
+static int intel_vgpu_probe(struct mdev_device *mdev)
{
struct intel_vgpu *vgpu = NULL;
struct intel_vgpu_type *type;
+ struct kvmgt_vdev *vdev;
struct device *pdev;
void *gvt;
int ret;
@@ -702,40 +695,40 @@ static int intel_vgpu_create(struct mdev_device *mdev)
type = intel_gvt_ops->gvt_find_vgpu_type(gvt,
mdev_get_type_group_id(mdev));
- if (!type) {
- ret = -EINVAL;
- goto out;
- }
+ if (!type)
+ return -EINVAL;
vgpu = intel_gvt_ops->vgpu_create(gvt, type);
if (IS_ERR_OR_NULL(vgpu)) {
- ret = vgpu == NULL ? -EFAULT : PTR_ERR(vgpu);
gvt_err("failed to create intel vgpu: %d\n", ret);
- goto out;
+ return vgpu == NULL ? -EFAULT : PTR_ERR(vgpu);
}
- INIT_WORK(&kvmgt_vdev(vgpu)->release_work, intel_vgpu_release_work);
+ vdev = kvmgt_vdev(vgpu);
+ INIT_WORK(&vdev->release_work, intel_vgpu_release_work);
+ vfio_init_group_dev(&vdev->vfio_device, &mdev->dev,
+ &intel_vgpu_dev_ops);
- kvmgt_vdev(vgpu)->mdev = mdev;
- mdev_set_drvdata(mdev, vgpu);
+ ret = vfio_register_group_dev(&vdev->vfio_device);
+ if (ret) {
+ intel_gvt_ops->vgpu_destroy(vgpu);
+ return ret;
+ }
+ dev_set_drvdata(&mdev->dev, vdev);
gvt_dbg_core("intel_vgpu_create succeeded for mdev: %s\n",
dev_name(mdev_dev(mdev)));
- ret = 0;
-
-out:
- return ret;
+ return 0;
}
-static int intel_vgpu_remove(struct mdev_device *mdev)
+static void intel_vgpu_remove(struct mdev_device *mdev)
{
- struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
-
- if (handle_valid(vgpu->handle))
- return -EBUSY;
+ struct kvmgt_vdev *vdev = dev_get_drvdata(&mdev->dev);
+ struct intel_vgpu *vgpu = vdev->vgpu;
+ if (WARN_ON(handle_valid(vgpu->handle)))
+ return;
intel_gvt_ops->vgpu_destroy(vgpu);
- return 0;
}
static int intel_vgpu_iommu_notifier(struct notifier_block *nb,
@@ -788,10 +781,11 @@ static int intel_vgpu_group_notifier(struct notifier_block *nb,
return NOTIFY_OK;
}
-static int intel_vgpu_open(struct mdev_device *mdev)
+static int intel_vgpu_open(struct vfio_device *vfio_dev)
{
- struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
- struct kvmgt_vdev *vdev = kvmgt_vdev(vgpu);
+ struct kvmgt_vdev *vdev =
+ container_of(vfio_dev, struct kvmgt_vdev, vfio_device);
+ struct intel_vgpu *vgpu = vdev->vgpu;
unsigned long events;
int ret;
struct vfio_group *vfio_group;
@@ -800,7 +794,7 @@ static int intel_vgpu_open(struct mdev_device *mdev)
vdev->group_notifier.notifier_call = intel_vgpu_group_notifier;
events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
- ret = vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY, &events,
+ ret = vfio_register_notifier(vfio_dev->dev, VFIO_IOMMU_NOTIFY, &events,
&vdev->iommu_notifier);
if (ret != 0) {
gvt_vgpu_err("vfio_register_notifier for iommu failed: %d\n",
@@ -809,7 +803,7 @@ static int intel_vgpu_open(struct mdev_device *mdev)
}
events = VFIO_GROUP_NOTIFY_SET_KVM;
- ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY, &events,
+ ret = vfio_register_notifier(vfio_dev->dev, VFIO_GROUP_NOTIFY, &events,
&vdev->group_notifier);
if (ret != 0) {
gvt_vgpu_err("vfio_register_notifier for group failed: %d\n",
@@ -817,7 +811,7 @@ static int intel_vgpu_open(struct mdev_device *mdev)
goto undo_iommu;
}
- vfio_group = vfio_group_get_external_user_from_dev(mdev_dev(mdev));
+ vfio_group = vfio_group_get_external_user_from_dev(vfio_dev->dev);
if (IS_ERR_OR_NULL(vfio_group)) {
ret = !vfio_group ? -EFAULT : PTR_ERR(vfio_group);
gvt_vgpu_err("vfio_group_get_external_user_from_dev failed\n");
@@ -833,11 +827,11 @@ static int intel_vgpu_open(struct mdev_device *mdev)
goto undo_group;
}
- ret = kvmgt_guest_init(mdev);
+ ret = kvmgt_guest_init(vdev);
if (ret)
goto undo_group;
- intel_gvt_ops->vgpu_activate(vgpu);
+ intel_gvt_ops->vgpu_activate(vdev->vgpu);
atomic_set(&vdev->released, 0);
return ret;
@@ -847,11 +841,11 @@ static int intel_vgpu_open(struct mdev_device *mdev)
vdev->vfio_group = NULL;
undo_register:
- vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
+ vfio_unregister_notifier(vfio_dev->dev, VFIO_GROUP_NOTIFY,
&vdev->group_notifier);
undo_iommu:
- vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
+ vfio_unregister_notifier(vfio_dev->dev, VFIO_IOMMU_NOTIFY,
&vdev->iommu_notifier);
out:
return ret;
@@ -884,12 +878,12 @@ static void __intel_vgpu_release(struct intel_vgpu *vgpu)
intel_gvt_ops->vgpu_release(vgpu);
- ret = vfio_unregister_notifier(mdev_dev(vdev->mdev), VFIO_IOMMU_NOTIFY,
+ ret = vfio_unregister_notifier(vdev->vfio_device.dev, VFIO_IOMMU_NOTIFY,
&vdev->iommu_notifier);
drm_WARN(&i915->drm, ret,
"vfio_unregister_notifier for iommu failed: %d\n", ret);
- ret = vfio_unregister_notifier(mdev_dev(vdev->mdev), VFIO_GROUP_NOTIFY,
+ ret = vfio_unregister_notifier(vdev->vfio_device.dev, VFIO_GROUP_NOTIFY,
&vdev->group_notifier);
drm_WARN(&i915->drm, ret,
"vfio_unregister_notifier for group failed: %d\n", ret);
@@ -907,11 +901,12 @@ static void __intel_vgpu_release(struct intel_vgpu *vgpu)
vgpu->handle = 0;
}
-static void intel_vgpu_release(struct mdev_device *mdev)
+static void intel_vgpu_release(struct vfio_device *vfio_dev)
{
- struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
+ struct kvmgt_vdev *vdev =
+ container_of(vfio_dev, struct kvmgt_vdev, vfio_device);
- __intel_vgpu_release(vgpu);
+ __intel_vgpu_release(vdev->vgpu);
}
static void intel_vgpu_release_work(struct work_struct *work)
@@ -997,11 +992,10 @@ static int intel_vgpu_aperture_rw(struct intel_vgpu *vgpu, u64 off,
return 0;
}
-static ssize_t intel_vgpu_rw(struct mdev_device *mdev, char *buf,
+static ssize_t intel_vgpu_rw(struct kvmgt_vdev *vdev, char *buf,
size_t count, loff_t *ppos, bool is_write)
{
- struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
- struct kvmgt_vdev *vdev = kvmgt_vdev(vgpu);
+ struct intel_vgpu *vgpu = vdev->vgpu;
unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
u64 pos = *ppos & VFIO_PCI_OFFSET_MASK;
int ret = -EINVAL;
@@ -1047,9 +1041,9 @@ static ssize_t intel_vgpu_rw(struct mdev_device *mdev, char *buf,
return ret == 0 ? count : ret;
}
-static bool gtt_entry(struct mdev_device *mdev, loff_t *ppos)
+static bool gtt_entry(struct kvmgt_vdev *vdev, loff_t *ppos)
{
- struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
+ struct intel_vgpu *vgpu = vdev->vgpu;
unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
struct intel_gvt *gvt = vgpu->gvt;
int offset;
@@ -1066,9 +1060,11 @@ static bool gtt_entry(struct mdev_device *mdev, loff_t *ppos)
true : false;
}
-static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
+static ssize_t intel_vgpu_read(struct vfio_device *vfio_dev, char __user *buf,
size_t count, loff_t *ppos)
{
+ struct kvmgt_vdev *vdev =
+ container_of(vfio_dev, struct kvmgt_vdev, vfio_device);
unsigned int done = 0;
int ret;
@@ -1077,10 +1073,10 @@ static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
/* Only support GGTT entry 8 bytes read */
if (count >= 8 && !(*ppos % 8) &&
- gtt_entry(mdev, ppos)) {
+ gtt_entry(vdev, ppos)) {
u64 val;
- ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
+ ret = intel_vgpu_rw(vdev, (char *)&val, sizeof(val),
ppos, false);
if (ret <= 0)
goto read_err;
@@ -1092,7 +1088,7 @@ static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
} else if (count >= 4 && !(*ppos % 4)) {
u32 val;
- ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
+ ret = intel_vgpu_rw(vdev, (char *)&val, sizeof(val),
ppos, false);
if (ret <= 0)
goto read_err;
@@ -1104,7 +1100,7 @@ static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
} else if (count >= 2 && !(*ppos % 2)) {
u16 val;
- ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
+ ret = intel_vgpu_rw(vdev, (char *)&val, sizeof(val),
ppos, false);
if (ret <= 0)
goto read_err;
@@ -1116,7 +1112,7 @@ static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
} else {
u8 val;
- ret = intel_vgpu_rw(mdev, &val, sizeof(val), ppos,
+ ret = intel_vgpu_rw(vdev, &val, sizeof(val), ppos,
false);
if (ret <= 0)
goto read_err;
@@ -1139,10 +1135,12 @@ static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
return -EFAULT;
}
-static ssize_t intel_vgpu_write(struct mdev_device *mdev,
+static ssize_t intel_vgpu_write(struct vfio_device *vfio_dev,
const char __user *buf,
size_t count, loff_t *ppos)
{
+ struct kvmgt_vdev *vdev =
+ container_of(vfio_dev, struct kvmgt_vdev, vfio_device);
unsigned int done = 0;
int ret;
@@ -1151,13 +1149,13 @@ static ssize_t intel_vgpu_write(struct mdev_device *mdev,
/* Only support GGTT entry 8 bytes write */
if (count >= 8 && !(*ppos % 8) &&
- gtt_entry(mdev, ppos)) {
+ gtt_entry(vdev, ppos)) {
u64 val;
if (copy_from_user(&val, buf, sizeof(val)))
goto write_err;
- ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
+ ret = intel_vgpu_rw(vdev, (char *)&val, sizeof(val),
ppos, true);
if (ret <= 0)
goto write_err;
@@ -1169,7 +1167,7 @@ static ssize_t intel_vgpu_write(struct mdev_device *mdev,
if (copy_from_user(&val, buf, sizeof(val)))
goto write_err;
- ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
+ ret = intel_vgpu_rw(vdev, (char *)&val, sizeof(val),
ppos, true);
if (ret <= 0)
goto write_err;
@@ -1181,7 +1179,7 @@ static ssize_t intel_vgpu_write(struct mdev_device *mdev,
if (copy_from_user(&val, buf, sizeof(val)))
goto write_err;
- ret = intel_vgpu_rw(mdev, (char *)&val,
+ ret = intel_vgpu_rw(vdev, (char *)&val,
sizeof(val), ppos, true);
if (ret <= 0)
goto write_err;
@@ -1193,7 +1191,7 @@ static ssize_t intel_vgpu_write(struct mdev_device *mdev,
if (copy_from_user(&val, buf, sizeof(val)))
goto write_err;
- ret = intel_vgpu_rw(mdev, &val, sizeof(val),
+ ret = intel_vgpu_rw(vdev, &val, sizeof(val),
ppos, true);
if (ret <= 0)
goto write_err;
@@ -1212,13 +1210,16 @@ static ssize_t intel_vgpu_write(struct mdev_device *mdev,
return -EFAULT;
}
-static int intel_vgpu_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
+static int intel_vgpu_mmap(struct vfio_device *vfio_dev,
+ struct vm_area_struct *vma)
{
+ struct kvmgt_vdev *vdev =
+ container_of(vfio_dev, struct kvmgt_vdev, vfio_device);
unsigned int index;
u64 virtaddr;
unsigned long req_size, pgoff, req_start;
pgprot_t pg_prot;
- struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
+ struct intel_vgpu *vgpu = vdev->vgpu;
index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
if (index >= VFIO_PCI_ROM_REGION_INDEX)
@@ -1341,11 +1342,12 @@ static int intel_vgpu_set_irqs(struct intel_vgpu *vgpu, u32 flags,
return func(vgpu, index, start, count, flags, data);
}
-static long intel_vgpu_ioctl(struct mdev_device *mdev, unsigned int cmd,
+static long intel_vgpu_ioctl(struct vfio_device *vfio_dev, unsigned int cmd,
unsigned long arg)
{
- struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
- struct kvmgt_vdev *vdev = kvmgt_vdev(vgpu);
+ struct kvmgt_vdev *vdev =
+ container_of(vfio_dev, struct kvmgt_vdev, vfio_device);
+ struct intel_vgpu *vgpu = vdev->vgpu;
unsigned long minsz;
gvt_dbg_core("vgpu%d ioctl, cmd: %d\n", vgpu->id, cmd);
@@ -1624,14 +1626,10 @@ static ssize_t
vgpu_id_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
- struct mdev_device *mdev = mdev_from_dev(dev);
+ struct kvmgt_vdev *vdev = dev_get_drvdata(dev);
+ struct intel_vgpu *vgpu = vdev->vgpu;
- if (mdev) {
- struct intel_vgpu *vgpu = (struct intel_vgpu *)
- mdev_get_drvdata(mdev);
- return sprintf(buf, "%d\n", vgpu->id);
- }
- return sprintf(buf, "\n");
+ return sprintf(buf, "%d\n", vgpu->id);
}
static DEVICE_ATTR_RO(vgpu_id);
@@ -1651,18 +1649,28 @@ static const struct attribute_group *intel_vgpu_groups[] = {
NULL,
};
-static struct mdev_parent_ops intel_vgpu_ops = {
- .mdev_attr_groups = intel_vgpu_groups,
- .create = intel_vgpu_create,
- .remove = intel_vgpu_remove,
+static const struct vfio_device_ops intel_vgpu_dev_ops = {
+ .open = intel_vgpu_open,
+ .release = intel_vgpu_release,
+ .read = intel_vgpu_read,
+ .write = intel_vgpu_write,
+ .mmap = intel_vgpu_mmap,
+ .ioctl = intel_vgpu_ioctl,
+};
- .open = intel_vgpu_open,
- .release = intel_vgpu_release,
+static struct mdev_driver intel_vgpu_mdev_driver = {
+ .driver = {
+ .name = "intel_vgpu_mdev",
+ .owner = THIS_MODULE,
+ .mod_name = KBUILD_MODNAME,
+ .dev_groups = intel_vgpu_groups,
+ },
+ .probe = intel_vgpu_probe,
+ .remove = intel_vgpu_remove,
+};
- .read = intel_vgpu_read,
- .write = intel_vgpu_write,
- .mmap = intel_vgpu_mmap,
- .ioctl = intel_vgpu_ioctl,
+static struct mdev_parent_ops intel_vgpu_ops = {
+ .device_driver = &intel_vgpu_mdev_driver,
};
static int kvmgt_host_init(struct device *dev, void *gvt, const void *ops)
@@ -1806,18 +1814,12 @@ static bool __kvmgt_vgpu_exist(struct intel_vgpu *vgpu, struct kvm *kvm)
return ret;
}
-static int kvmgt_guest_init(struct mdev_device *mdev)
+static int kvmgt_guest_init(struct kvmgt_vdev *vdev)
{
struct kvmgt_guest_info *info;
- struct intel_vgpu *vgpu;
- struct kvmgt_vdev *vdev;
+ struct intel_vgpu *vgpu = vdev->vgpu;
struct kvm *kvm;
- vgpu = mdev_get_drvdata(mdev);
- if (handle_valid(vgpu->handle))
- return -EEXIST;
-
- vdev = kvmgt_vdev(vgpu);
kvm = vdev->kvm;
if (!kvm || kvm->mm != current->mm) {
gvt_vgpu_err("KVM is required to use Intel vGPU\n");
@@ -2125,13 +2127,25 @@ static const struct intel_gvt_mpt kvmgt_mpt = {
static int __init kvmgt_init(void)
{
- if (intel_gvt_register_hypervisor(&kvmgt_mpt) < 0)
- return -ENODEV;
+ int ret;
+
+ ret = mdev_register_driver(&intel_vgpu_mdev_driver);
+ if (ret)
+ return ret;
+
+ if (intel_gvt_register_hypervisor(&kvmgt_mpt) < 0) {
+ ret = -ENODEV;
+ goto err_driver;
+ }
return 0;
+err_driver:
+ mdev_unregister_driver(&intel_vgpu_mdev_driver);
+ return ret;
}
static void __exit kvmgt_exit(void)
{
+ mdev_unregister_driver(&intel_vgpu_mdev_driver);
intel_gvt_unregister_hypervisor();
}
--
2.31.1
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^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH v2 11/13] vfio/mdev: Remove mdev_parent_ops
2021-04-26 20:00 [PATCH v2 00/13] Remove vfio_mdev.c, mdev_parent_ops and more Jason Gunthorpe
2021-04-26 20:00 ` [PATCH v2 01/13] vfio/mdev: Remove CONFIG_VFIO_MDEV_DEVICE Jason Gunthorpe
2021-04-26 20:00 ` [PATCH v2 08/13] vfio/gvt: Convert to use vfio_register_group_dev() Jason Gunthorpe
@ 2021-04-26 20:00 ` Jason Gunthorpe
2021-04-27 21:30 ` [PATCH v2 00/13] Remove vfio_mdev.c, mdev_parent_ops and more Alex Williamson
3 siblings, 0 replies; 8+ messages in thread
From: Jason Gunthorpe @ 2021-04-26 20:00 UTC (permalink / raw)
To: David Airlie, Tony Krowiak, Alex Williamson,
Christian Borntraeger, Cornelia Huck, Jonathan Corbet,
Daniel Vetter, dri-devel, Eric Farman, Harald Freudenberger,
Vasily Gorbik, Heiko Carstens, intel-gfx, intel-gvt-dev,
Jani Nikula, Joonas Lahtinen, kvm, Kirti Wankhede, linux-doc,
linux-s390, Peter Oberparleiter, Halil Pasic, Pierre Morel,
Rodrigo Vivi, Vineeth Vijayan, Zhenyu Wang, Zhi Wang
Cc: Max Gurtovoy, Raj, Ashok, Tarun Gupta, Dan Williams,
Leon Romanovsky, Christoph Hellwig
The last useful member in this struct is the supported_type_groups, move
it to the mdev_driver and delete mdev_parent_ops.
Replace it with mdev_driver as an argument to mdev_register_device()
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
.../driver-api/vfio-mediated-device.rst | 37 +++++++------------
drivers/gpu/drm/i915/gvt/kvmgt.c | 8 +---
drivers/s390/cio/vfio_ccw_ops.c | 7 +---
drivers/s390/crypto/vfio_ap_ops.c | 9 +----
drivers/vfio/mdev/mdev_core.c | 13 +++----
drivers/vfio/mdev/mdev_driver.c | 2 +-
drivers/vfio/mdev/mdev_private.h | 2 +-
drivers/vfio/mdev/mdev_sysfs.c | 6 +--
include/linux/mdev.h | 24 ++----------
samples/vfio-mdev/mbochs.c | 9 +----
samples/vfio-mdev/mdpy.c | 9 +----
samples/vfio-mdev/mtty.c | 9 +----
12 files changed, 39 insertions(+), 96 deletions(-)
diff --git a/Documentation/driver-api/vfio-mediated-device.rst b/Documentation/driver-api/vfio-mediated-device.rst
index 5f866b17c93e69..a073d0bb06e7fd 100644
--- a/Documentation/driver-api/vfio-mediated-device.rst
+++ b/Documentation/driver-api/vfio-mediated-device.rst
@@ -93,7 +93,7 @@ interfaces:
Registration Interface for a Mediated Bus Driver
------------------------------------------------
-The registration interface for a mediated bus driver provides the following
+The registration interface for a mediated device driver provides the following
structure to represent a mediated device's driver::
/*
@@ -105,6 +105,7 @@ structure to represent a mediated device's driver::
struct mdev_driver {
int (*probe) (struct mdev_device *dev);
void (*remove) (struct mdev_device *dev);
+ struct attribute_group **supported_type_groups;
struct device_driver driver;
};
@@ -119,35 +120,25 @@ to register and unregister itself with the core driver:
extern void mdev_unregister_driver(struct mdev_driver *drv);
-The mediated bus driver is responsible for adding mediated devices to the VFIO
-group when devices are bound to the driver and removing mediated devices from
-the VFIO when devices are unbound from the driver.
+The mediated bus driver's probe function should create a vfio_device on top of
+the mdev_device and connect it to an appropriate implementation of
+vfio_device_ops.
-
-Physical Device Driver Interface
---------------------------------
-
-The physical device driver interface provides the mdev_parent_ops[3] structure
-to define the APIs to manage work in the mediated core driver that is related
-to the physical device.
-
-The structures in the mdev_parent_ops structure are as follows:
-
-* dev_attr_groups: attributes of the parent device
-* mdev_attr_groups: attributes of the mediated device
-* supported_config: attributes to define supported configurations
-
-A driver should use the mdev_parent_ops structure in the function call to
-register itself with the mdev core driver::
+When a driver wants to add the GUID creation sysfs to an existing device it has
+probe'd to then it should call:
extern int mdev_register_device(struct device *dev,
- const struct mdev_parent_ops *ops);
+ struct mdev_driver *mdev_driver);
+
+This will provide the 'mdev_supported_types/XX/create' files which can then be
+used to trigger the creation of a mdev_device. The created mdev_device will be
+attached to the specified driver.
-However, the mdev_parent_ops structure is not required in the function call
-that a driver should use to unregister itself with the mdev core driver::
+When the driver needs to remove itself it calls:
extern void mdev_unregister_device(struct device *dev);
+Which will unbind and destroy all the created mdevs and remove the sysfs files.
Mediated Device Management Interface Through sysfs
==================================================
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 85ef300087e091..02089efd15bb92 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -1669,10 +1669,6 @@ static struct mdev_driver intel_vgpu_mdev_driver = {
.remove = intel_vgpu_remove,
};
-static struct mdev_parent_ops intel_vgpu_ops = {
- .device_driver = &intel_vgpu_mdev_driver,
-};
-
static int kvmgt_host_init(struct device *dev, void *gvt, const void *ops)
{
struct attribute_group **kvm_vgpu_type_groups;
@@ -1680,9 +1676,9 @@ static int kvmgt_host_init(struct device *dev, void *gvt, const void *ops)
intel_gvt_ops = ops;
if (!intel_gvt_ops->get_gvt_attrs(&kvm_vgpu_type_groups))
return -EFAULT;
- intel_vgpu_ops.supported_type_groups = kvm_vgpu_type_groups;
+ intel_vgpu_mdev_driver.supported_type_groups = kvm_vgpu_type_groups;
- return mdev_register_device(dev, &intel_vgpu_ops);
+ return mdev_register_device(dev, &intel_vgpu_mdev_driver);
}
static void kvmgt_host_exit(struct device *dev)
diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index 0fcf46031d3821..161697529dcc41 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -655,17 +655,12 @@ struct mdev_driver vfio_ccw_mdev_driver = {
},
.probe = vfio_ccw_mdev_probe,
.remove = vfio_ccw_mdev_remove,
-};
-
-static const struct mdev_parent_ops vfio_ccw_mdev_ops = {
- .owner = THIS_MODULE,
- .device_driver = &vfio_ccw_mdev_driver,
.supported_type_groups = mdev_type_groups,
};
int vfio_ccw_mdev_reg(struct subchannel *sch)
{
- return mdev_register_device(&sch->dev, &vfio_ccw_mdev_ops);
+ return mdev_register_device(&sch->dev, &vfio_ccw_mdev_driver);
}
void vfio_ccw_mdev_unreg(struct subchannel *sch)
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 79872c857dd522..92789257c87639 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -1339,12 +1339,7 @@ static struct mdev_driver vfio_ap_matrix_driver = {
},
.probe = vfio_ap_mdev_probe,
.remove = vfio_ap_mdev_remove,
-};
-
-static const struct mdev_parent_ops vfio_ap_matrix_ops = {
- .owner = THIS_MODULE,
- .device_driver = &vfio_ap_matrix_driver,
- .supported_type_groups = vfio_ap_mdev_type_groups,
+ .supported_type_groups = vfio_ap_mdev_type_groups,
};
int vfio_ap_mdev_register(void)
@@ -1357,7 +1352,7 @@ int vfio_ap_mdev_register(void)
if (ret)
return ret;
- ret = mdev_register_device(&matrix_dev->device, &vfio_ap_matrix_ops);
+ ret = mdev_register_device(&matrix_dev->device, &vfio_ap_matrix_driver);
if (ret)
goto err_driver;
return 0;
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index d507047e6ecf4a..cd1ab9fe299445 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -109,12 +109,12 @@ static int mdev_device_remove_cb(struct device *dev, void *data)
/*
* mdev_register_device : Register a device
* @dev: device structure representing parent device.
- * @ops: Parent device operation structure to be registered.
+ * @mdev_driver: Device driver to bind to the newly created mdev
*
* Add device to list of registered parent devices.
* Returns a negative value on error, otherwise 0.
*/
-int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
+int mdev_register_device(struct device *dev, struct mdev_driver *mdev_driver)
{
int ret;
struct mdev_parent *parent;
@@ -122,9 +122,7 @@ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
char *envp[] = { env_string, NULL };
/* check for mandatory ops */
- if (!ops || !ops->supported_type_groups)
- return -EINVAL;
- if (!ops->device_driver)
+ if (!mdev_driver->supported_type_groups)
return -EINVAL;
dev = get_device(dev);
@@ -151,7 +149,7 @@ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
init_rwsem(&parent->unreg_sem);
parent->dev = dev;
- parent->ops = ops;
+ parent->mdev_driver = mdev_driver;
if (!mdev_bus_compat_class) {
mdev_bus_compat_class = class_compat_register("mdev_bus");
@@ -257,7 +255,7 @@ static int mdev_bind_driver(struct mdev_device *mdev)
while (1) {
device_lock(&mdev->dev);
if (mdev->dev.driver ==
- &mdev->type->parent->ops->device_driver->driver) {
+ &mdev->type->parent->mdev_driver->driver) {
ret = 0;
goto out_unlock;
}
@@ -304,7 +302,6 @@ int mdev_device_create(struct mdev_type *type, const guid_t *uuid)
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;
/* Pairs with the put in mdev_device_release() */
kobject_get(&type->kobj);
diff --git a/drivers/vfio/mdev/mdev_driver.c b/drivers/vfio/mdev/mdev_driver.c
index 07ada55efd6228..d743a9f51f4c90 100644
--- a/drivers/vfio/mdev/mdev_driver.c
+++ b/drivers/vfio/mdev/mdev_driver.c
@@ -75,7 +75,7 @@ static int mdev_match(struct device *dev, struct device_driver *drv)
{
struct mdev_device *mdev = to_mdev_device(dev);
- return drv == &mdev->type->parent->ops->device_driver->driver;
+ return drv == &mdev->type->parent->mdev_driver->driver;
}
struct bus_type mdev_bus_type = {
diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h
index a656cfe0346c33..839567d059a07d 100644
--- a/drivers/vfio/mdev/mdev_private.h
+++ b/drivers/vfio/mdev/mdev_private.h
@@ -15,7 +15,7 @@ void mdev_bus_unregister(void);
struct mdev_parent {
struct device *dev;
- const struct mdev_parent_ops *ops;
+ const struct mdev_driver *mdev_driver;
struct kref ref;
struct list_head next;
struct kset *mdev_types_kset;
diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index 66eef08833a4ef..5a3873d1a275ae 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -97,7 +97,7 @@ static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
{
struct mdev_type *type;
struct attribute_group *group =
- parent->ops->supported_type_groups[type_group_id];
+ parent->mdev_driver->supported_type_groups[type_group_id];
int ret;
if (!group->name) {
@@ -154,7 +154,7 @@ 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];
+ type->parent->mdev_driver->supported_type_groups[type->type_group_id];
sysfs_remove_files(&type->kobj,
(const struct attribute **)group->attrs);
@@ -168,7 +168,7 @@ static int add_mdev_supported_type_groups(struct mdev_parent *parent)
{
int i;
- for (i = 0; parent->ops->supported_type_groups[i]; i++) {
+ for (i = 0; parent->mdev_driver->supported_type_groups[i]; i++) {
struct mdev_type *type;
type = add_mdev_supported_type(parent, i);
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index fd9fe1dcf0e230..af807c77c1e0f5 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -51,25 +51,6 @@ unsigned int mdev_get_type_group_id(struct mdev_device *mdev);
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
- * register the device to mdev module.
- *
- * @owner: The module owner.
- * @device_driver: Which device driver to probe() on newly created devices
- * @mdev_attr_groups: Attributes of the mediated device.
- * @supported_type_groups: Attributes to define supported types. It is mandatory
- * to provide supported types.
- * Parent device that support mediated device should be registered with mdev
- * module with mdev_parent_ops structure.
- **/
-struct mdev_parent_ops {
- struct module *owner;
- struct mdev_driver *device_driver;
- const struct attribute_group **mdev_attr_groups;
- struct attribute_group **supported_type_groups;
-};
-
/* interface for exporting mdev supported type attributes */
struct mdev_type_attribute {
struct attribute attr;
@@ -94,12 +75,15 @@ struct mdev_type_attribute mdev_type_attr_##_name = \
* struct mdev_driver - Mediated device driver
* @probe: called when new device created
* @remove: called when device removed
+ * @supported_type_groups: Attributes to define supported types. It is mandatory
+ * to provide supported types.
* @driver: device driver structure
*
**/
struct mdev_driver {
int (*probe)(struct mdev_device *dev);
void (*remove)(struct mdev_device *dev);
+ struct attribute_group **supported_type_groups;
struct device_driver driver;
};
@@ -118,7 +102,7 @@ static inline const guid_t *mdev_uuid(struct mdev_device *mdev)
extern struct bus_type mdev_bus_type;
-int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops);
+int mdev_register_device(struct device *dev, struct mdev_driver *mdev_driver);
void mdev_unregister_device(struct device *dev);
int mdev_register_driver(struct mdev_driver *drv);
diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index e18821a8a6beb8..c76ceec584b41b 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -1418,12 +1418,7 @@ static struct mdev_driver mbochs_driver = {
},
.probe = mbochs_probe,
.remove = mbochs_remove,
-};
-
-static const struct mdev_parent_ops mdev_fops = {
- .owner = THIS_MODULE,
- .device_driver = &mbochs_driver,
- .supported_type_groups = mdev_type_groups,
+ .supported_type_groups = mdev_type_groups,
};
static const struct file_operations vd_fops = {
@@ -1466,7 +1461,7 @@ static int __init mbochs_dev_init(void)
if (ret)
goto err_class;
- ret = mdev_register_device(&mbochs_dev, &mdev_fops);
+ ret = mdev_register_device(&mbochs_dev, &mbochs_driver);
if (ret)
goto err_device;
diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c
index 82638de333330d..c22b2c808d132d 100644
--- a/samples/vfio-mdev/mdpy.c
+++ b/samples/vfio-mdev/mdpy.c
@@ -735,12 +735,7 @@ static struct mdev_driver mdpy_driver = {
},
.probe = mdpy_probe,
.remove = mdpy_remove,
-};
-
-static const struct mdev_parent_ops mdev_fops = {
- .owner = THIS_MODULE,
- .device_driver = &mdpy_driver,
- .supported_type_groups = mdev_type_groups,
+ .supported_type_groups = mdev_type_groups,
};
static const struct file_operations vd_fops = {
@@ -783,7 +778,7 @@ static int __init mdpy_dev_init(void)
if (ret)
goto err_class;
- ret = mdev_register_device(&mdpy_dev, &mdev_fops);
+ ret = mdev_register_device(&mdpy_dev, &mdpy_driver);
if (ret)
goto err_device;
diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
index 31eec76bc553ce..87f5ba12a230e3 100644
--- a/samples/vfio-mdev/mtty.c
+++ b/samples/vfio-mdev/mtty.c
@@ -1308,12 +1308,7 @@ static struct mdev_driver mtty_driver = {
},
.probe = mtty_probe,
.remove = mtty_remove,
-};
-
-static const struct mdev_parent_ops mdev_fops = {
- .owner = THIS_MODULE,
- .device_driver = &mtty_driver,
- .supported_type_groups = mdev_type_groups,
+ .supported_type_groups = mdev_type_groups,
};
static void mtty_device_release(struct device *dev)
@@ -1364,7 +1359,7 @@ static int __init mtty_dev_init(void)
if (ret)
goto err_class;
- ret = mdev_register_device(&mtty_dev.dev, &mdev_fops);
+ ret = mdev_register_device(&mtty_dev.dev, &mtty_driver);
if (ret)
goto err_device;
--
2.31.1
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