[PATCH v6 5/8] drm/xe/display: Update intel_bo_read_from_page to use ttm_bo_access

[Matthew Brost <matthew.brost@intel.com>]

Don't open code vmap of a BO, use ttm_bo_access helper which is safe for
non-contiguous BOs and non-visible BOs.

Suggested-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
---
 drivers/gpu/drm/xe/display/intel_bo.c | 25 +------------------------
 1 file changed, 1 insertion(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/xe/display/intel_bo.c b/drivers/gpu/drm/xe/display/intel_bo.c
index 9f54fad0f1c0..43141964f6f2 100644
--- a/drivers/gpu/drm/xe/display/intel_bo.c
+++ b/drivers/gpu/drm/xe/display/intel_bo.c
@@ -40,31 +40,8 @@ int intel_bo_fb_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
 int intel_bo_read_from_page(struct drm_gem_object *obj, u64 offset, void *dst, int size)
 {
 	struct xe_bo *bo = gem_to_xe_bo(obj);
-	struct ttm_bo_kmap_obj map;
-	void *src;
-	bool is_iomem;
-	int ret;
 
-	ret = xe_bo_lock(bo, true);
-	if (ret)
-		return ret;
-
-	ret = ttm_bo_kmap(&bo->ttm, offset >> PAGE_SHIFT, 1, &map);
-	if (ret)
-		goto out_unlock;
-
-	offset &= ~PAGE_MASK;
-	src = ttm_kmap_obj_virtual(&map, &is_iomem);
-	src += offset;
-	if (is_iomem)
-		memcpy_fromio(dst, (void __iomem *)src, size);
-	else
-		memcpy(dst, src, size);
-
-	ttm_bo_kunmap(&map);
-out_unlock:
-	xe_bo_unlock(bo);
-	return ret;
+	return ttm_bo_access(&bo->ttm, offset, dst, size, 0);
 }
 
 struct intel_frontbuffer *intel_bo_get_frontbuffer(struct drm_gem_object *obj)
-- 
2.34.1