Hi
Am 16.04.21 um 15:46 schrieb Christian König:
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@suse.de Reviewed-by: Zack Rusin zackr@vmware.com
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.
We have to spare something for patches 6 and 7. Otherwise they'd be empty. ;)
Best regards Thomas
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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