Am 16.04.21 um 15:31 schrieb Thomas Zimmermann:
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().
v2:
* replace pr_err() with drm_err() (Zack)
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Reviewed-by: Zack Rusin <zackr@xxxxxxxxxx>
---
drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c | 56 ++++++++++++++++++++++--
1 file changed, 53 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..c8b6543b4e39 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
@@ -27,6 +27,32 @@
#include "vmwgfx_drv.h"
+static struct ttm_buffer_object *vmw_bo_vm_lookup(struct ttm_device *bdev,
+ unsigned long offset,
+ unsigned long pages)
+{
+ struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
+ struct drm_device *drm = &dev_priv->drm;
+ 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)
+ drm_err(drm, "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 +67,28 @@ 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);
Is there any reason we can't call vmw_verify_access() directly here?
Would allow us to completely nuke the verify_access callback as well as
far as I can see.
Regards,
Christian.
+ 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 +96,13 @@ 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 */
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