[PATCH v4 3/7] drm/radeon: Implement mmap as GEM object function
Thomas Zimmermann
tzimmermann at suse.de
Tue May 25 15:10:51 UTC 2021
Moving the driver-specific mmap code into a GEM object function allows
for using DRM helpers for various mmap callbacks.
This change also allows to support prime-based mmap via DRM's helper
drm_gem_prime_mmap().
Permission checks are implemented by drm_gem_mmap(), with an additional
check for radeon_ttm_tt_has_userptr() in the GEM object function. The
function radeon_verify_access() is now unused and has thus been removed.
As a side effect, radeon_ttm_vm_ops and radeon_ttm_fault() are now
implemented in amdgpu's GEM code.
v3:
* remove unnecessary checks from mmap (Christian)
v2:
* rename radeon_ttm_vm_ops and radeon_ttm_fault() to
radeon_gem_vm_ops and radeon_gem_fault() (Christian)
* fix commit description (Alex)
Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
drivers/gpu/drm/radeon/radeon_drv.c | 3 +-
drivers/gpu/drm/radeon/radeon_gem.c | 49 ++++++++++++++++++++++
drivers/gpu/drm/radeon/radeon_ttm.c | 65 -----------------------------
drivers/gpu/drm/radeon/radeon_ttm.h | 1 -
4 files changed, 51 insertions(+), 67 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index 31d3dd0e5258..8cd135fa6dcd 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -545,7 +545,7 @@ static const struct file_operations radeon_driver_kms_fops = {
.open = drm_open,
.release = drm_release,
.unlocked_ioctl = radeon_drm_ioctl,
- .mmap = radeon_mmap,
+ .mmap = drm_gem_mmap,
.poll = drm_poll,
.read = drm_read,
#ifdef CONFIG_COMPAT
@@ -620,6 +620,7 @@ static const struct drm_driver kms_driver = {
.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_prime_import_sg_table = radeon_gem_prime_import_sg_table,
+ .gem_prime_mmap = drm_gem_prime_mmap,
.name = DRIVER_NAME,
.desc = DRIVER_DESC,
diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
index 05ea2f39f626..ff8849827d61 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -44,6 +44,42 @@ void radeon_gem_prime_unpin(struct drm_gem_object *obj);
const struct drm_gem_object_funcs radeon_gem_object_funcs;
+static vm_fault_t radeon_gem_fault(struct vm_fault *vmf)
+{
+ struct ttm_buffer_object *bo = vmf->vma->vm_private_data;
+ struct radeon_device *rdev = radeon_get_rdev(bo->bdev);
+ vm_fault_t ret;
+
+ down_read(&rdev->pm.mclk_lock);
+
+ ret = ttm_bo_vm_reserve(bo, vmf);
+ if (ret)
+ goto unlock_mclk;
+
+ ret = radeon_bo_fault_reserve_notify(bo);
+ if (ret)
+ goto unlock_resv;
+
+ ret = ttm_bo_vm_fault_reserved(vmf, vmf->vma->vm_page_prot,
+ TTM_BO_VM_NUM_PREFAULT, 1);
+ if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
+ goto unlock_mclk;
+
+unlock_resv:
+ dma_resv_unlock(bo->base.resv);
+
+unlock_mclk:
+ up_read(&rdev->pm.mclk_lock);
+ return ret;
+}
+
+static const struct vm_operations_struct radeon_gem_vm_ops = {
+ .fault = radeon_gem_fault,
+ .open = ttm_bo_vm_open,
+ .close = ttm_bo_vm_close,
+ .access = ttm_bo_vm_access
+};
+
static void radeon_gem_object_free(struct drm_gem_object *gobj)
{
struct radeon_bo *robj = gem_to_radeon_bo(gobj);
@@ -226,6 +262,17 @@ static int radeon_gem_handle_lockup(struct radeon_device *rdev, int r)
return r;
}
+static int radeon_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
+{
+ struct radeon_bo *bo = gem_to_radeon_bo(obj);
+ struct radeon_device *rdev = radeon_get_rdev(bo->tbo.bdev);
+
+ if (radeon_ttm_tt_has_userptr(rdev, bo->tbo.ttm))
+ return -EPERM;
+
+ return drm_gem_ttm_mmap(obj, vma);
+}
+
const struct drm_gem_object_funcs radeon_gem_object_funcs = {
.free = radeon_gem_object_free,
.open = radeon_gem_object_open,
@@ -236,6 +283,8 @@ const struct drm_gem_object_funcs radeon_gem_object_funcs = {
.get_sg_table = radeon_gem_prime_get_sg_table,
.vmap = drm_gem_ttm_vmap,
.vunmap = drm_gem_ttm_vunmap,
+ .mmap = radeon_gem_object_mmap,
+ .vm_ops = &radeon_gem_vm_ops,
};
/*
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 3361d11769a2..a71d94f7067b 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -135,17 +135,6 @@ static void radeon_evict_flags(struct ttm_buffer_object *bo,
*placement = rbo->placement;
}
-static int radeon_verify_access(struct ttm_buffer_object *bo, struct file *filp)
-{
- struct radeon_bo *rbo = container_of(bo, struct radeon_bo, tbo);
- struct radeon_device *rdev = radeon_get_rdev(bo->bdev);
-
- if (radeon_ttm_tt_has_userptr(rdev, bo->ttm))
- return -EPERM;
- return drm_vma_node_verify_access(&rbo->tbo.base.vma_node,
- filp->private_data);
-}
-
static int radeon_move_blit(struct ttm_buffer_object *bo,
bool evict,
struct ttm_resource *new_mem,
@@ -703,7 +692,6 @@ static struct ttm_device_funcs radeon_bo_driver = {
.eviction_valuable = ttm_bo_eviction_valuable,
.evict_flags = &radeon_evict_flags,
.move = &radeon_bo_move,
- .verify_access = &radeon_verify_access,
.delete_mem_notify = &radeon_bo_delete_mem_notify,
.io_mem_reserve = &radeon_ttm_io_mem_reserve,
};
@@ -800,59 +788,6 @@ void radeon_ttm_set_active_vram_size(struct radeon_device *rdev, u64 size)
man->size = size >> PAGE_SHIFT;
}
-static vm_fault_t radeon_ttm_fault(struct vm_fault *vmf)
-{
- struct ttm_buffer_object *bo = vmf->vma->vm_private_data;
- struct radeon_device *rdev = radeon_get_rdev(bo->bdev);
- vm_fault_t ret;
-
- down_read(&rdev->pm.mclk_lock);
-
- ret = ttm_bo_vm_reserve(bo, vmf);
- if (ret)
- goto unlock_mclk;
-
- ret = radeon_bo_fault_reserve_notify(bo);
- if (ret)
- goto unlock_resv;
-
- ret = ttm_bo_vm_fault_reserved(vmf, vmf->vma->vm_page_prot,
- TTM_BO_VM_NUM_PREFAULT, 1);
- if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
- goto unlock_mclk;
-
-unlock_resv:
- dma_resv_unlock(bo->base.resv);
-
-unlock_mclk:
- up_read(&rdev->pm.mclk_lock);
- return ret;
-}
-
-static const struct vm_operations_struct radeon_ttm_vm_ops = {
- .fault = radeon_ttm_fault,
- .open = ttm_bo_vm_open,
- .close = ttm_bo_vm_close,
- .access = ttm_bo_vm_access
-};
-
-int radeon_mmap(struct file *filp, struct vm_area_struct *vma)
-{
- int r;
- struct drm_file *file_priv = filp->private_data;
- struct radeon_device *rdev = file_priv->minor->dev->dev_private;
-
- if (rdev == NULL)
- return -EINVAL;
-
- r = ttm_bo_mmap(filp, vma, &rdev->mman.bdev);
- if (unlikely(r != 0))
- return r;
-
- vma->vm_ops = &radeon_ttm_vm_ops;
- return 0;
-}
-
#if defined(CONFIG_DEBUG_FS)
static int radeon_mm_vram_dump_table_show(struct seq_file *m, void *unused)
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.h b/drivers/gpu/drm/radeon/radeon_ttm.h
index 4d7b90ee2774..91ea7141bc81 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.h
+++ b/drivers/gpu/drm/radeon/radeon_ttm.h
@@ -32,6 +32,5 @@ struct radeon_device;
int radeon_ttm_init(struct radeon_device *rdev);
void radeon_ttm_fini(struct radeon_device *rdev);
-int radeon_mmap(struct file *filp, struct vm_area_struct *vma);
#endif /* __RADEON_TTM_H__ */
--
2.31.1
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