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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Am 06.04.21 um 11:08 schrieb Thomas Zimmermann:
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@xxxxxxx>
---
  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)

Please name this radeon_gem_fault or radeon_gem_object_fault.

Apart from that looks good to me.

Christian.

+{
+	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__ */

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



[Index of Archives]     [Linux DRI Users]     [Linux Intel Graphics]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux