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Thomas Zimmermann

2021-Apr-06 09:08 UTC

[Nouveau] [PATCH 0/8] drm: Clean up mmap for TTM-based GEM drivers

Implement mmap via struct drm_gem_object_functions.mmap for amdgpu,
radeon and nouveau. This allows for using common DRM helpers for
the mmap-related callbacks in struct file_operations and struct
drm_driver. The drivers have their own vm_ops, which are now set
automatically by the DRM core functions. The code in each driver's
verify_access becomes part of the driver's new mmap implementation.

With the GEM drivers converted, vmwgfx is the only user of
ttm_bo_mmap() and related infrastructure. So move everything into
vmwgfx and delete the rsp code from TTM.

This touches several drivers. Preferably everything would be merged
at once via drm-misc-next.

Thomas Zimmermann (8):
  drm/ttm: Don't override vm_ops callbacks, if set
  drm/amdgpu: Remove unused function amdgpu_bo_fbdev_mmap()
  drm/amdgpu: Implement mmap as GEM object function
  drm/radeon: Implement mmap as GEM object function
  drm/nouveau: Implement mmap as GEM object function
  drm/vmwgfx: Inline ttm_bo_mmap() into vmwgfx driver
  drm/vmwgfx: Inline vmw_verify_access()
  drm/ttm: Remove ttm_bo_mmap() and friends

 drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 46 -------------
 drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.h |  2 -
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c     |  4 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c     | 64 +++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c  | 19 ------
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.h  |  2 -
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c     | 71 ---------------------
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h     |  1 -
 drivers/gpu/drm/nouveau/nouveau_bo.c        | 10 ---
 drivers/gpu/drm/nouveau/nouveau_drm.c       |  3 +-
 drivers/gpu/drm/nouveau/nouveau_gem.c       | 36 +++++++++++
 drivers/gpu/drm/nouveau/nouveau_ttm.c       | 49 --------------
 drivers/gpu/drm/nouveau/nouveau_ttm.h       |  1 -
 drivers/gpu/drm/radeon/radeon_drv.c         |  3 +-
 drivers/gpu/drm/radeon/radeon_gem.c         | 52 +++++++++++++++
 drivers/gpu/drm/radeon/radeon_ttm.c         | 65 -------------------
 drivers/gpu/drm/radeon/radeon_ttm.h         |  1 -
 drivers/gpu/drm/ttm/ttm_bo_vm.c             | 60 ++---------------
 drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c  |  9 ---
 drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c    | 51 ++++++++++++++-
 include/drm/ttm/ttm_bo_api.h                | 13 ----
 include/drm/ttm/ttm_device.h                | 15 -----
 22 files changed, 212 insertions(+), 365 deletions(-)

--
2.30.2

Thomas Zimmermann

2021-Apr-06 09:08 UTC

head link

[Nouveau] [PATCH 1/8] drm/ttm: Don't override vm_ops callbacks, if set

Drivers may want to set their own callbacks for a VM area. Only set
TTM's callbacks if the vm_ops field is clear.

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
 drivers/gpu/drm/ttm/ttm_bo_vm.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index b31b18058965..bf4a213bc66c 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -534,7 +534,12 @@ static struct ttm_buffer_object *ttm_bo_vm_lookup(struct
ttm_device *bdev,
 
 static void ttm_bo_mmap_vma_setup(struct ttm_buffer_object *bo, struct
vm_area_struct *vma)
 {
-	vma->vm_ops = &ttm_bo_vm_ops;
+	/*
+	 * Drivers may want to override the vm_ops field. Otherwise we
+	 * use TTM's default callbacks.
+	 */
+	if (!vma->vm_ops)
+		vma->vm_ops = &ttm_bo_vm_ops;
 
 	/*
 	 * Note: We're transferring the bo reference to
-- 
2.30.2

Thomas Zimmermann

2021-Apr-06 09:08 UTC

head link

[Nouveau] [PATCH 2/8] drm/amdgpu: Remove unused function amdgpu_bo_fbdev_mmap()

Remove an unused function. Mapping the fbdev framebuffer is apparently
not supported.

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 19 -------------------
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.h |  2 --
 2 files changed, 21 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index b99e9d8736c2..cfc89164dee8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -1092,25 +1092,6 @@ void amdgpu_bo_fini(struct amdgpu_device *adev)
 	}
 }
 
-/**
- * amdgpu_bo_fbdev_mmap - mmap fbdev memory
- * @bo: &amdgpu_bo buffer object
- * @vma: vma as input from the fbdev mmap method
- *
- * Calls ttm_fbdev_mmap() to mmap fbdev memory if it is backed by a bo.
- *
- * Returns:
- * 0 for success or a negative error code on failure.
- */
-int amdgpu_bo_fbdev_mmap(struct amdgpu_bo *bo,
-			     struct vm_area_struct *vma)
-{
-	if (vma->vm_pgoff != 0)
-		return -EACCES;
-
-	return ttm_bo_mmap_obj(vma, &bo->tbo);
-}
-
 /**
  * amdgpu_bo_set_tiling_flags - set tiling flags
  * @bo: &amdgpu_bo buffer object
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
index 54ceb065e546..46e94d413c5c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
@@ -268,8 +268,6 @@ void amdgpu_bo_unpin(struct amdgpu_bo *bo);
 int amdgpu_bo_evict_vram(struct amdgpu_device *adev);
 int amdgpu_bo_init(struct amdgpu_device *adev);
 void amdgpu_bo_fini(struct amdgpu_device *adev);
-int amdgpu_bo_fbdev_mmap(struct amdgpu_bo *bo,
-				struct vm_area_struct *vma);
 int amdgpu_bo_set_tiling_flags(struct amdgpu_bo *bo, u64 tiling_flags);
 void amdgpu_bo_get_tiling_flags(struct amdgpu_bo *bo, u64 *tiling_flags);
 int amdgpu_bo_set_metadata (struct amdgpu_bo *bo, void *metadata,
-- 
2.30.2

Thomas Zimmermann

2021-Apr-06 09:08 UTC

head link

[Nouveau] [PATCH 3/8] drm/amdgpu: Implement mmap as GEM object function

Moving the driver-specific mmap code into a GEM object function allows
for using DRM helpers for various mmap callbacks.

This change resolves several inconsistencies between regular mmap and
prime-based mmap. The vm_ops field in vma is now set for all mmap'ed
areas. Previously it way only set for regular mmap calls, prime-based
mmap used TTM's default vm_ops. The check for kfd_bo has been taken
from amdgpu_verify_access(), which is not called any longer and has
been removed.

As a side effect, amdgpu_ttm_vm_ops and amdgpu_ttm_fault() are now
implemented in amdgpu's GEM code.

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 46 -------------
 drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.h |  2 -
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c     |  4 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c     | 64 +++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c     | 71 ---------------------
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h     |  1 -
 6 files changed, 66 insertions(+), 122 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
index e0c4f7c7f1b9..19c5ab08d9ec 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
@@ -42,52 +42,6 @@
 #include <linux/pci-p2pdma.h>
 #include <linux/pm_runtime.h>
 
-/**
- * amdgpu_gem_prime_mmap - &drm_driver.gem_prime_mmap implementation
- * @obj: GEM BO
- * @vma: Virtual memory area
- *
- * Sets up a userspace mapping of the BO's memory in the given
- * virtual memory area.
- *
- * Returns:
- * 0 on success or a negative error code on failure.
- */
-int amdgpu_gem_prime_mmap(struct drm_gem_object *obj,
-			  struct vm_area_struct *vma)
-{
-	struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
-	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
-	unsigned asize = amdgpu_bo_size(bo);
-	int ret;
-
-	if (!vma->vm_file)
-		return -ENODEV;
-
-	if (adev == NULL)
-		return -ENODEV;
-
-	/* Check for valid size. */
-	if (asize < vma->vm_end - vma->vm_start)
-		return -EINVAL;
-
-	if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm) ||
-	    (bo->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS)) {
-		return -EPERM;
-	}
-	vma->vm_pgoff += amdgpu_bo_mmap_offset(bo) >> PAGE_SHIFT;
-
-	/* prime mmap does not need to check access, so allow here */
-	ret = drm_vma_node_allow(&obj->vma_node,
vma->vm_file->private_data);
-	if (ret)
-		return ret;
-
-	ret = ttm_bo_mmap(vma->vm_file, vma, &adev->mman.bdev);
-	drm_vma_node_revoke(&obj->vma_node, vma->vm_file->private_data);
-
-	return ret;
-}
-
 static int
 __dma_resv_make_exclusive(struct dma_resv *obj)
 {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.h
index 39b5b9616fd8..3e93b9b407a9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.h
@@ -31,8 +31,6 @@ struct drm_gem_object *amdgpu_gem_prime_import(struct
drm_device *dev,
 					    struct dma_buf *dma_buf);
 bool amdgpu_dmabuf_is_xgmi_accessible(struct amdgpu_device *adev,
 				      struct amdgpu_bo *bo);
-int amdgpu_gem_prime_mmap(struct drm_gem_object *obj,
-			  struct vm_area_struct *vma);
 
 extern const struct dma_buf_ops amdgpu_dmabuf_ops;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 76f48f79c70b..e96d2758f4bb 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -1656,7 +1656,7 @@ static const struct file_operations amdgpu_driver_kms_fops
= {
 	.flush = amdgpu_flush,
 	.release = drm_release,
 	.unlocked_ioctl = amdgpu_drm_ioctl,
-	.mmap = amdgpu_mmap,
+	.mmap = drm_gem_mmap,
 	.poll = drm_poll,
 	.read = drm_read,
 #ifdef CONFIG_COMPAT
@@ -1719,7 +1719,7 @@ static const struct drm_driver amdgpu_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 = amdgpu_gem_prime_import,
-	.gem_prime_mmap = amdgpu_gem_prime_mmap,
+	.gem_prime_mmap = drm_gem_prime_mmap,
 
 	.name = DRIVER_NAME,
 	.desc = DRIVER_DESC,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index fb7171e5507c..fe93faad05f2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -41,6 +41,36 @@
 
 static const struct drm_gem_object_funcs amdgpu_gem_object_funcs;
 
+static vm_fault_t amdgpu_ttm_fault(struct vm_fault *vmf)
+{
+	struct ttm_buffer_object *bo = vmf->vma->vm_private_data;
+	vm_fault_t ret;
+
+	ret = ttm_bo_vm_reserve(bo, vmf);
+	if (ret)
+		return ret;
+
+	ret = amdgpu_bo_fault_reserve_notify(bo);
+	if (ret)
+		goto unlock;
+
+	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))
+		return ret;
+
+unlock:
+	dma_resv_unlock(bo->base.resv);
+	return ret;
+}
+
+static const struct vm_operations_struct amdgpu_ttm_vm_ops = {
+	.fault = amdgpu_ttm_fault,
+	.open = ttm_bo_vm_open,
+	.close = ttm_bo_vm_close,
+	.access = ttm_bo_vm_access
+};
+
 static void amdgpu_gem_object_free(struct drm_gem_object *gobj)
 {
 	struct amdgpu_bo *robj = gem_to_amdgpu_bo(gobj);
@@ -201,6 +231,38 @@ static void amdgpu_gem_object_close(struct drm_gem_object
*obj,
 	ttm_eu_backoff_reservation(&ticket, &list);
 }
 
+static int amdgpu_gem_prime_mmap(struct drm_gem_object *obj, struct
vm_area_struct *vma)
+{
+	struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
+	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
+	unsigned long asize = amdgpu_bo_size(bo);
+
+	if (!vma->vm_file)
+		return -ENODEV;
+
+	if (!adev)
+		return -ENODEV;
+
+	/* Check for valid size. */
+	if (asize < vma->vm_end - vma->vm_start)
+		return -EINVAL;
+
+	/*
+	 * Don't verify access for KFD BOs. They don't have a GEM
+	 * object associated with them.
+	 */
+	if (bo->kfd_bo)
+		goto out;
+
+	if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm) ||
+	    (bo->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS)) {
+		return -EPERM;
+	}
+
+out:
+	return drm_gem_ttm_mmap(obj, vma);
+}
+
 static const struct drm_gem_object_funcs amdgpu_gem_object_funcs = {
 	.free = amdgpu_gem_object_free,
 	.open = amdgpu_gem_object_open,
@@ -208,6 +270,8 @@ static const struct drm_gem_object_funcs
amdgpu_gem_object_funcs = {
 	.export = amdgpu_gem_prime_export,
 	.vmap = drm_gem_ttm_vmap,
 	.vunmap = drm_gem_ttm_vunmap,
+	.mmap = amdgpu_gem_prime_mmap,
+	.vm_ops = &amdgpu_ttm_vm_ops,
 };
 
 /*
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 1c6131489a85..d9de91a517c6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -152,32 +152,6 @@ static void amdgpu_evict_flags(struct ttm_buffer_object
*bo,
 	*placement = abo->placement;
 }
 
-/**
- * amdgpu_verify_access - Verify access for a mmap call
- *
- * @bo:	The buffer object to map
- * @filp: The file pointer from the process performing the mmap
- *
- * This is called by ttm_bo_mmap() to verify whether a process
- * has the right to mmap a BO to their process space.
- */
-static int amdgpu_verify_access(struct ttm_buffer_object *bo, struct file
*filp)
-{
-	struct amdgpu_bo *abo = ttm_to_amdgpu_bo(bo);
-
-	/*
-	 * Don't verify access for KFD BOs. They don't have a GEM
-	 * object associated with them.
-	 */
-	if (abo->kfd_bo)
-		return 0;
-
-	if (amdgpu_ttm_tt_get_usermm(bo->ttm))
-		return -EPERM;
-	return drm_vma_node_verify_access(&abo->tbo.base.vma_node,
-					  filp->private_data);
-}
-
 /**
  * amdgpu_ttm_map_buffer - Map memory into the GART windows
  * @bo: buffer object to map
@@ -1531,7 +1505,6 @@ static struct ttm_device_funcs amdgpu_bo_driver = {
 	.eviction_valuable = amdgpu_ttm_bo_eviction_valuable,
 	.evict_flags = &amdgpu_evict_flags,
 	.move = &amdgpu_bo_move,
-	.verify_access = &amdgpu_verify_access,
 	.delete_mem_notify = &amdgpu_bo_delete_mem_notify,
 	.release_notify = &amdgpu_bo_release_notify,
 	.io_mem_reserve = &amdgpu_ttm_io_mem_reserve,
@@ -1906,50 +1879,6 @@ void amdgpu_ttm_set_buffer_funcs_status(struct
amdgpu_device *adev, bool enable)
 	adev->mman.buffer_funcs_enabled = enable;
 }
 
-static vm_fault_t amdgpu_ttm_fault(struct vm_fault *vmf)
-{
-	struct ttm_buffer_object *bo = vmf->vma->vm_private_data;
-	vm_fault_t ret;
-
-	ret = ttm_bo_vm_reserve(bo, vmf);
-	if (ret)
-		return ret;
-
-	ret = amdgpu_bo_fault_reserve_notify(bo);
-	if (ret)
-		goto unlock;
-
-	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))
-		return ret;
-
-unlock:
-	dma_resv_unlock(bo->base.resv);
-	return ret;
-}
-
-static const struct vm_operations_struct amdgpu_ttm_vm_ops = {
-	.fault = amdgpu_ttm_fault,
-	.open = ttm_bo_vm_open,
-	.close = ttm_bo_vm_close,
-	.access = ttm_bo_vm_access
-};
-
-int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma)
-{
-	struct drm_file *file_priv = filp->private_data;
-	struct amdgpu_device *adev = drm_to_adev(file_priv->minor->dev);
-	int r;
-
-	r = ttm_bo_mmap(filp, vma, &adev->mman.bdev);
-	if (unlikely(r != 0))
-		return r;
-
-	vma->vm_ops = &amdgpu_ttm_vm_ops;
-	return 0;
-}
-
 int amdgpu_copy_buffer(struct amdgpu_ring *ring, uint64_t src_offset,
 		       uint64_t dst_offset, uint32_t byte_count,
 		       struct dma_resv *resv,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
index dec0db8b0b13..6e51faad7371 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
@@ -146,7 +146,6 @@ int amdgpu_fill_buffer(struct amdgpu_bo *bo,
 			struct dma_resv *resv,
 			struct dma_fence **fence);
 
-int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma);
 int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo);
 int amdgpu_ttm_recover_gart(struct ttm_buffer_object *tbo);
 uint64_t amdgpu_ttm_domain_start(struct amdgpu_device *adev, uint32_t type);
-- 
2.30.2

Thomas Zimmermann

2021-Apr-06 09:08 UTC

head link

[Nouveau] [PATCH 4/8] drm/radeon: Implement mmap as GEM object function

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, amdgpu_ttm_vm_ops and amdgpu_ttm_fault() are now
implemented in amdgpu's GEM code.

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
 drivers/gpu/drm/radeon/radeon_drv.c |  3 +-
 drivers/gpu/drm/radeon/radeon_gem.c | 52 +++++++++++++++++++++++
 drivers/gpu/drm/radeon/radeon_ttm.c | 65 -----------------------------
 drivers/gpu/drm/radeon/radeon_ttm.h |  1 -
 4 files changed, 54 insertions(+), 67 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_drv.c
b/drivers/gpu/drm/radeon/radeon_drv.c
index efeb115ae70e..4039b6d71aa2 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -557,7 +557,7 @@ 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
@@ -632,6 +632,7 @@ 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..71e8737bce01 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_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
+};
+
 static void radeon_gem_object_free(struct drm_gem_object *gobj)
 {
 	struct radeon_bo *robj = gem_to_radeon_bo(gobj);
@@ -226,6 +262,20 @@ 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 (!rdev)
+		return -EINVAL;
+
+	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 +286,8 @@ 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_ttm_vm_ops,
 };
 
 /*
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c
b/drivers/gpu/drm/radeon/radeon_ttm.c
index 476ce9c24b9f..a5ce43a909a2 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -136,17 +136,6 @@ 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,
@@ -704,7 +693,6 @@ 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,
 };
@@ -801,59 +789,6 @@ 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__ */
-- 
2.30.2

Thomas Zimmermann

2021-Apr-06 09:09 UTC

head link

[Nouveau] [PATCH 5/8] drm/nouveau: Implement mmap as GEM object function

Moving the driver-specific mmap code into a GEM object function allows
for using DRM helpers for various mmap callbacks.

The GEM object function is provided by GEM TTM helpers. Nouveau's
implementation of verify_access is unused and has been removed. Access
permissions are validated by the DRM helpers.

As a side effect, nouveau_ttm_vm_ops and nouveau_ttm_fault() are now
implemented in nouveau's GEM code.

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
 drivers/gpu/drm/nouveau/nouveau_bo.c  | 10 ------
 drivers/gpu/drm/nouveau/nouveau_drm.c |  3 +-
 drivers/gpu/drm/nouveau/nouveau_gem.c | 36 ++++++++++++++++++++
 drivers/gpu/drm/nouveau/nouveau_ttm.c | 49 ---------------------------
 drivers/gpu/drm/nouveau/nouveau_ttm.h |  1 -
 5 files changed, 38 insertions(+), 61 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c
b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 3e09df0472ce..bc67cbccc83b 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -1051,15 +1051,6 @@ nouveau_bo_move(struct ttm_buffer_object *bo, bool evict,
 	return ret;
 }
 
-static int
-nouveau_bo_verify_access(struct ttm_buffer_object *bo, struct file *filp)
-{
-	struct nouveau_bo *nvbo = nouveau_bo(bo);
-
-	return drm_vma_node_verify_access(&nvbo->bo.base.vma_node,
-					  filp->private_data);
-}
-
 static void
 nouveau_ttm_io_mem_free_locked(struct nouveau_drm *drm,
 			       struct ttm_resource *reg)
@@ -1332,7 +1323,6 @@ struct ttm_device_funcs nouveau_bo_driver = {
 	.evict_flags = nouveau_bo_evict_flags,
 	.delete_mem_notify = nouveau_bo_delete_mem_notify,
 	.move = nouveau_bo_move,
-	.verify_access = nouveau_bo_verify_access,
 	.io_mem_reserve = &nouveau_ttm_io_mem_reserve,
 	.io_mem_free = &nouveau_ttm_io_mem_free,
 };
diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c
b/drivers/gpu/drm/nouveau/nouveau_drm.c
index 885815ea917f..7586328c1de5 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -1177,7 +1177,7 @@ nouveau_driver_fops = {
 	.open = drm_open,
 	.release = drm_release,
 	.unlocked_ioctl = nouveau_drm_ioctl,
-	.mmap = nouveau_ttm_mmap,
+	.mmap = drm_gem_mmap,
 	.poll = drm_poll,
 	.read = drm_read,
 #if defined(CONFIG_COMPAT)
@@ -1210,6 +1210,7 @@ driver_stub = {
 	.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 = nouveau_gem_prime_import_sg_table,
+	.gem_prime_mmap = drm_gem_prime_mmap,
 
 	.dumb_create = nouveau_display_dumb_create,
 	.dumb_map_offset = nouveau_display_dumb_map_offset,
diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c
b/drivers/gpu/drm/nouveau/nouveau_gem.c
index c88cbb85f101..71dfac820c4d 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -39,6 +39,40 @@
 #include <nvif/class.h>
 #include <nvif/push206e.h>
 
+static vm_fault_t nouveau_ttm_fault(struct vm_fault *vmf)
+{
+	struct vm_area_struct *vma = vmf->vma;
+	struct ttm_buffer_object *bo = vma->vm_private_data;
+	pgprot_t prot;
+	vm_fault_t ret;
+
+	ret = ttm_bo_vm_reserve(bo, vmf);
+	if (ret)
+		return ret;
+
+	ret = nouveau_ttm_fault_reserve_notify(bo);
+	if (ret)
+		goto error_unlock;
+
+	nouveau_bo_del_io_reserve_lru(bo);
+	prot = vm_get_page_prot(vma->vm_flags);
+	ret = ttm_bo_vm_fault_reserved(vmf, prot, TTM_BO_VM_NUM_PREFAULT, 1);
+	nouveau_bo_add_io_reserve_lru(bo);
+	if (ret == VM_FAULT_RETRY && !(vmf->flags &
FAULT_FLAG_RETRY_NOWAIT))
+		return ret;
+
+error_unlock:
+	dma_resv_unlock(bo->base.resv);
+	return ret;
+}
+
+static const struct vm_operations_struct nouveau_ttm_vm_ops = {
+	.fault = nouveau_ttm_fault,
+	.open = ttm_bo_vm_open,
+	.close = ttm_bo_vm_close,
+	.access = ttm_bo_vm_access
+};
+
 void
 nouveau_gem_object_del(struct drm_gem_object *gem)
 {
@@ -180,6 +214,8 @@ const struct drm_gem_object_funcs nouveau_gem_object_funcs =
{
 	.get_sg_table = nouveau_gem_prime_get_sg_table,
 	.vmap = drm_gem_ttm_vmap,
 	.vunmap = drm_gem_ttm_vunmap,
+	.mmap = drm_gem_ttm_mmap,
+	.vm_ops = &nouveau_ttm_vm_ops,
 };
 
 int
diff --git a/drivers/gpu/drm/nouveau/nouveau_ttm.c
b/drivers/gpu/drm/nouveau/nouveau_ttm.c
index b81ae90b8449..e511a26379da 100644
--- a/drivers/gpu/drm/nouveau/nouveau_ttm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_ttm.c
@@ -127,55 +127,6 @@ const struct ttm_resource_manager_func nv04_gart_manager =
{
 	.free = nouveau_manager_del,
 };
 
-static vm_fault_t nouveau_ttm_fault(struct vm_fault *vmf)
-{
-	struct vm_area_struct *vma = vmf->vma;
-	struct ttm_buffer_object *bo = vma->vm_private_data;
-	pgprot_t prot;
-	vm_fault_t ret;
-
-	ret = ttm_bo_vm_reserve(bo, vmf);
-	if (ret)
-		return ret;
-
-	ret = nouveau_ttm_fault_reserve_notify(bo);
-	if (ret)
-		goto error_unlock;
-
-	nouveau_bo_del_io_reserve_lru(bo);
-	prot = vm_get_page_prot(vma->vm_flags);
-	ret = ttm_bo_vm_fault_reserved(vmf, prot, TTM_BO_VM_NUM_PREFAULT, 1);
-	nouveau_bo_add_io_reserve_lru(bo);
-	if (ret == VM_FAULT_RETRY && !(vmf->flags &
FAULT_FLAG_RETRY_NOWAIT))
-		return ret;
-
-error_unlock:
-	dma_resv_unlock(bo->base.resv);
-	return ret;
-}
-
-static const struct vm_operations_struct nouveau_ttm_vm_ops = {
-	.fault = nouveau_ttm_fault,
-	.open = ttm_bo_vm_open,
-	.close = ttm_bo_vm_close,
-	.access = ttm_bo_vm_access
-};
-
-int
-nouveau_ttm_mmap(struct file *filp, struct vm_area_struct *vma)
-{
-	struct drm_file *file_priv = filp->private_data;
-	struct nouveau_drm *drm = nouveau_drm(file_priv->minor->dev);
-	int ret;
-
-	ret = ttm_bo_mmap(filp, vma, &drm->ttm.bdev);
-	if (ret)
-		return ret;
-
-	vma->vm_ops = &nouveau_ttm_vm_ops;
-	return 0;
-}
-
 static int
 nouveau_ttm_init_host(struct nouveau_drm *drm, u8 kind)
 {
diff --git a/drivers/gpu/drm/nouveau/nouveau_ttm.h
b/drivers/gpu/drm/nouveau/nouveau_ttm.h
index dbf6dc238efd..2f0efda7ccdb 100644
--- a/drivers/gpu/drm/nouveau/nouveau_ttm.h
+++ b/drivers/gpu/drm/nouveau/nouveau_ttm.h
@@ -17,7 +17,6 @@ struct ttm_tt *nouveau_sgdma_create_ttm(struct
ttm_buffer_object *bo,
 
 int  nouveau_ttm_init(struct nouveau_drm *drm);
 void nouveau_ttm_fini(struct nouveau_drm *drm);
-int  nouveau_ttm_mmap(struct file *, struct vm_area_struct *);
 
 int  nouveau_ttm_global_init(struct nouveau_drm *);
 void nouveau_ttm_global_release(struct nouveau_drm *);
-- 
2.30.2

Thomas Zimmermann

2021-Apr-06 09:09 UTC

head link

[Nouveau] [PATCH 6/8] drm/vmwgfx: Inline ttm_bo_mmap() into vmwgfx driver

The vmwgfx driver is the only remaining user of ttm_bo_mmap(). Inline
the code. The internal helper ttm_bo_vm_lookup() is now also part of
vmwgfx as vmw_bo_vm_lookup().

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c | 54 ++++++++++++++++++++++--
 1 file changed, 51 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
index cb9975889e2f..3eaad00668f2 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
@@ -27,6 +27,30 @@
 
 #include "vmwgfx_drv.h"
 
+static struct ttm_buffer_object *vmw_bo_vm_lookup(struct ttm_device *bdev,
+						  unsigned long offset,
+						  unsigned long pages)
+{
+	struct drm_vma_offset_node *node;
+	struct ttm_buffer_object *bo = NULL;
+
+	drm_vma_offset_lock_lookup(bdev->vma_manager);
+
+	node = drm_vma_offset_lookup_locked(bdev->vma_manager, offset, pages);
+	if (likely(node)) {
+		bo = container_of(node, struct ttm_buffer_object,
+				  base.vma_node);
+		bo = ttm_bo_get_unless_zero(bo);
+	}
+
+	drm_vma_offset_unlock_lookup(bdev->vma_manager);
+
+	if (!bo)
+		pr_err("Could not find buffer object to map\n");
+
+	return bo;
+}
+
 int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
 {
 	static const struct vm_operations_struct vmw_vm_ops = {
@@ -41,10 +65,28 @@ int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
 	};
 	struct drm_file *file_priv = filp->private_data;
 	struct vmw_private *dev_priv = vmw_priv(file_priv->minor->dev);
-	int ret = ttm_bo_mmap(filp, vma, &dev_priv->bdev);
+	struct ttm_device *bdev = &dev_priv->bdev;
+	struct ttm_buffer_object *bo;
+	int ret;
+
+	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET_START))
+		return -EINVAL;
+
+	bo = vmw_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma));
+	if (unlikely(!bo))
+		return -EINVAL;
 
-	if (ret)
-		return ret;
+	if (unlikely(!bo->bdev->funcs->verify_access)) {
+		ret = -EPERM;
+		goto out_unref;
+	}
+	ret = bo->bdev->funcs->verify_access(bo, filp);
+	if (unlikely(ret != 0))
+		goto out_unref;
+
+	ret = ttm_bo_mmap_obj(vma, bo);
+	if (unlikely(ret != 0))
+		goto out_unref;
 
 	vma->vm_ops = &vmw_vm_ops;
 
@@ -52,7 +94,13 @@ int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
 	if (!is_cow_mapping(vma->vm_flags))
 		vma->vm_flags = (vma->vm_flags & ~VM_MIXEDMAP) | VM_PFNMAP;
 
+	ttm_bo_put(bo); /* release extra ref taken by ttm_bo_mmap_obj() */
+
 	return 0;
+
+out_unref:
+	ttm_bo_put(bo);
+	return ret;
 }
 
 /* struct vmw_validation_mem callback */
-- 
2.30.2

Thomas Zimmermann

2021-Apr-06 09:09 UTC

head link

[Nouveau] [PATCH 7/8] drm/vmwgfx: Inline vmw_verify_access()

Vmwgfx is the only user of the TTM's verify_access callback. Inline
the call and avoid the indirection through the function pointer.

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c | 9 ---------
 drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c   | 7 ++-----
 2 files changed, 2 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c
b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c
index 2dc031fe4a90..a079734f9d68 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c
@@ -658,14 +658,6 @@ static void vmw_evict_flags(struct ttm_buffer_object *bo,
 	*placement = vmw_sys_placement;
 }
 
-static int vmw_verify_access(struct ttm_buffer_object *bo, struct file *filp)
-{
-	struct ttm_object_file *tfile -		vmw_fpriv((struct drm_file
*)filp->private_data)->tfile;
-
-	return vmw_user_bo_verify_access(bo, tfile);
-}
-
 static int vmw_ttm_io_mem_reserve(struct ttm_device *bdev, struct ttm_resource
*mem)
 {
 	struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
@@ -768,7 +760,6 @@ struct ttm_device_funcs vmw_bo_driver = {
 	.eviction_valuable = ttm_bo_eviction_valuable,
 	.evict_flags = vmw_evict_flags,
 	.move = vmw_move,
-	.verify_access = vmw_verify_access,
 	.swap_notify = vmw_swap_notify,
 	.io_mem_reserve = &vmw_ttm_io_mem_reserve,
 };
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
index 3eaad00668f2..2574d4707407 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
@@ -65,6 +65,7 @@ int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
 	};
 	struct drm_file *file_priv = filp->private_data;
 	struct vmw_private *dev_priv = vmw_priv(file_priv->minor->dev);
+	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 	struct ttm_device *bdev = &dev_priv->bdev;
 	struct ttm_buffer_object *bo;
 	int ret;
@@ -76,11 +77,7 @@ int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
 	if (unlikely(!bo))
 		return -EINVAL;
 
-	if (unlikely(!bo->bdev->funcs->verify_access)) {
-		ret = -EPERM;
-		goto out_unref;
-	}
-	ret = bo->bdev->funcs->verify_access(bo, filp);
+	ret = vmw_user_bo_verify_access(bo, tfile);
 	if (unlikely(ret != 0))
 		goto out_unref;
 
-- 
2.30.2

Thomas Zimmermann

2021-Apr-06 09:09 UTC

head link

[Nouveau] [PATCH 8/8] drm/ttm: Remove ttm_bo_mmap() and friends

The function ttm_bo_mmap is unused. Remove it and it's helpers; including
the verify_access callback in struct ttm_device_funcs.

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
 drivers/gpu/drm/ttm/ttm_bo_vm.c | 53 ---------------------------------
 include/drm/ttm/ttm_bo_api.h    | 13 --------
 include/drm/ttm/ttm_device.h    | 15 ----------
 3 files changed, 81 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index bf4a213bc66c..6cd352399941 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -508,30 +508,6 @@ static const struct vm_operations_struct ttm_bo_vm_ops = {
 	.access = ttm_bo_vm_access,
 };
 
-static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_device *bdev,
-						  unsigned long offset,
-						  unsigned long pages)
-{
-	struct drm_vma_offset_node *node;
-	struct ttm_buffer_object *bo = NULL;
-
-	drm_vma_offset_lock_lookup(bdev->vma_manager);
-
-	node = drm_vma_offset_lookup_locked(bdev->vma_manager, offset, pages);
-	if (likely(node)) {
-		bo = container_of(node, struct ttm_buffer_object,
-				  base.vma_node);
-		bo = ttm_bo_get_unless_zero(bo);
-	}
-
-	drm_vma_offset_unlock_lookup(bdev->vma_manager);
-
-	if (!bo)
-		pr_err("Could not find buffer object to map\n");
-
-	return bo;
-}
-
 static void ttm_bo_mmap_vma_setup(struct ttm_buffer_object *bo, struct
vm_area_struct *vma)
 {
 	/*
@@ -559,35 +535,6 @@ static void ttm_bo_mmap_vma_setup(struct ttm_buffer_object
*bo, struct vm_area_s
 	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
 }
 
-int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
-		struct ttm_device *bdev)
-{
-	struct ttm_buffer_object *bo;
-	int ret;
-
-	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET_START))
-		return -EINVAL;
-
-	bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma));
-	if (unlikely(!bo))
-		return -EINVAL;
-
-	if (unlikely(!bo->bdev->funcs->verify_access)) {
-		ret = -EPERM;
-		goto out_unref;
-	}
-	ret = bo->bdev->funcs->verify_access(bo, filp);
-	if (unlikely(ret != 0))
-		goto out_unref;
-
-	ttm_bo_mmap_vma_setup(bo, vma);
-	return 0;
-out_unref:
-	ttm_bo_put(bo);
-	return ret;
-}
-EXPORT_SYMBOL(ttm_bo_mmap);
-
 int ttm_bo_mmap_obj(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
 {
 	ttm_bo_get(bo);
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 2155e2e38aec..6e35680ac01b 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -522,19 +522,6 @@ void ttm_bo_vunmap(struct ttm_buffer_object *bo, struct
dma_buf_map *map);
  */
 int ttm_bo_mmap_obj(struct vm_area_struct *vma, struct ttm_buffer_object *bo);
 
-/**
- * ttm_bo_mmap - mmap out of the ttm device address space.
- *
- * @filp:      filp as input from the mmap method.
- * @vma:       vma as input from the mmap method.
- * @bdev:      Pointer to the ttm_device with the address space manager.
- *
- * This function is intended to be called by the device mmap method.
- * if the device address space is to be backed by the bo manager.
- */
-int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
-		struct ttm_device *bdev);
-
 /**
  * ttm_bo_io
  *
diff --git a/include/drm/ttm/ttm_device.h b/include/drm/ttm/ttm_device.h
index 7c8f87bd52d3..cd592f8e941b 100644
--- a/include/drm/ttm/ttm_device.h
+++ b/include/drm/ttm/ttm_device.h
@@ -161,21 +161,6 @@ struct ttm_device_funcs {
 		    struct ttm_resource *new_mem,
 		    struct ttm_place *hop);
 
-	/**
-	 * struct ttm_bo_driver_member verify_access
-	 *
-	 * @bo: Pointer to a buffer object.
-	 * @filp: Pointer to a struct file trying to access the object.
-	 *
-	 * Called from the map / write / read methods to verify that the
-	 * caller is permitted to access the buffer object.
-	 * This member may be set to NULL, which will refuse this kind of
-	 * access for all buffer objects.
-	 * This function should return 0 if access is granted, -EPERM otherwise.
-	 */
-	int (*verify_access)(struct ttm_buffer_object *bo,
-			     struct file *filp);
-
 	/**
 	 * Hook to notify driver about a resource delete.
 	 */
-- 
2.30.2

Daniel Vetter

2021-Apr-08 11:19 UTC

head link

[Nouveau] [PATCH 0/8] drm: Clean up mmap for TTM-based GEM drivers

On Tue, Apr 06, 2021 at 11:08:55AM +0200, Thomas Zimmermann
wrote:> Implement mmap via struct drm_gem_object_functions.mmap for amdgpu,
> radeon and nouveau. This allows for using common DRM helpers for
> the mmap-related callbacks in struct file_operations and struct
> drm_driver. The drivers have their own vm_ops, which are now set
> automatically by the DRM core functions. The code in each driver's
> verify_access becomes part of the driver's new mmap implementation.
Is there anything left in there which isn't already handled by the gem
checks? Iirc there was some custom limit for ttm drivers once to allow
co-existing with ums drivers, but that's never really been a thing since
forever ...
-Daniel
> 
> With the GEM drivers converted, vmwgfx is the only user of
> ttm_bo_mmap() and related infrastructure. So move everything into
> vmwgfx and delete the rsp code from TTM.
> 
> This touches several drivers. Preferably everything would be merged
> at once via drm-misc-next.
> 
> Thomas Zimmermann (8):
>   drm/ttm: Don't override vm_ops callbacks, if set
>   drm/amdgpu: Remove unused function amdgpu_bo_fbdev_mmap()
>   drm/amdgpu: Implement mmap as GEM object function
>   drm/radeon: Implement mmap as GEM object function
>   drm/nouveau: Implement mmap as GEM object function
>   drm/vmwgfx: Inline ttm_bo_mmap() into vmwgfx driver
>   drm/vmwgfx: Inline vmw_verify_access()
>   drm/ttm: Remove ttm_bo_mmap() and friends
> 
>  drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 46 -------------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.h |  2 -
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c     |  4 +-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c     | 64 +++++++++++++++++++
>  drivers/gpu/drm/amd/amdgpu/amdgpu_object.c  | 19 ------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_object.h  |  2 -
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c     | 71 ---------------------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h     |  1 -
>  drivers/gpu/drm/nouveau/nouveau_bo.c        | 10 ---
>  drivers/gpu/drm/nouveau/nouveau_drm.c       |  3 +-
>  drivers/gpu/drm/nouveau/nouveau_gem.c       | 36 +++++++++++
>  drivers/gpu/drm/nouveau/nouveau_ttm.c       | 49 --------------
>  drivers/gpu/drm/nouveau/nouveau_ttm.h       |  1 -
>  drivers/gpu/drm/radeon/radeon_drv.c         |  3 +-
>  drivers/gpu/drm/radeon/radeon_gem.c         | 52 +++++++++++++++
>  drivers/gpu/drm/radeon/radeon_ttm.c         | 65 -------------------
>  drivers/gpu/drm/radeon/radeon_ttm.h         |  1 -
>  drivers/gpu/drm/ttm/ttm_bo_vm.c             | 60 ++---------------
>  drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c  |  9 ---
>  drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c    | 51 ++++++++++++++-
>  include/drm/ttm/ttm_bo_api.h                | 13 ----
>  include/drm/ttm/ttm_device.h                | 15 -----
>  22 files changed, 212 insertions(+), 365 deletions(-)
> 
> --
> 2.30.2
> 
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Nouveau - Apr 2021 - [PATCH 2/8] drm/amdgpu: Remove unused function amdgpu_bo_fbdev_mmap()

[Nouveau] [PATCH 0/8] drm: Clean up mmap for TTM-based GEM drivers

[Nouveau] [PATCH 1/8] drm/ttm: Don't override vm_ops callbacks, if set

[Nouveau] [PATCH 2/8] drm/amdgpu: Remove unused function amdgpu_bo_fbdev_mmap()

[Nouveau] [PATCH 3/8] drm/amdgpu: Implement mmap as GEM object function

[Nouveau] [PATCH 4/8] drm/radeon: Implement mmap as GEM object function

[Nouveau] [PATCH 5/8] drm/nouveau: Implement mmap as GEM object function

[Nouveau] [PATCH 6/8] drm/vmwgfx: Inline ttm_bo_mmap() into vmwgfx driver

[Nouveau] [PATCH 7/8] drm/vmwgfx: Inline vmw_verify_access()

[Nouveau] [PATCH 8/8] drm/ttm: Remove ttm_bo_mmap() and friends

[Nouveau] [PATCH 0/8] drm: Clean up mmap for TTM-based GEM drivers