Re: [PATCH v3 5/7] drm/vmwgfx: Inline ttm_bo_mmap() into vmwgfx driver

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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@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.

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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--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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