[PATCH v2 5/5] drm/xe/pt: Add an additional check for dmabuf BOs while updating PTEs

[Vivek Kasireddy]

If a BO's is_devmem_external flag is set, it means that it is an
imported dmabuf BO that has a backing store in VRAM. Therefore, we
need to add XE_PPGTT_PTE_DM to the PTE flags as part of vm_bind.

v2:
- Use a cursor to iterate over the entries in the dma_addr array
  instead of relying on SG iterator (Matt)

Signed-off-by: Vivek Kasireddy <vivek.kasire...@intel.com>
---
 drivers/gpu/drm/xe/xe_pt.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_pt.c b/drivers/gpu/drm/xe/xe_pt.c
index f27f579f4d85..cfa11acbf525 100644
--- a/drivers/gpu/drm/xe/xe_pt.c
+++ b/drivers/gpu/drm/xe/xe_pt.c
@@ -660,10 +660,11 @@ xe_pt_stage_bind(struct xe_tile *tile, struct xe_vma *vma,
                        xe_walk.default_pte &= ~XE_USM_PPGTT_PTE_AE;
        }
 
-       if (is_devmem) {
+       if (is_devmem || bo->is_devmem_external)
                xe_walk.default_pte |= XE_PPGTT_PTE_DM;
+
+       if (is_devmem)
                xe_walk.dma_offset = vram_region_gpu_offset(bo->ttm.resource);
-       }
 
        if (!xe_vma_has_no_bo(vma) && xe_bo_is_stolen(bo))
                xe_walk.dma_offset = xe_ttm_stolen_gpu_offset(xe_bo_device(bo));
@@ -677,6 +678,9 @@ xe_pt_stage_bind(struct xe_tile *tile, struct xe_vma *vma,
                else if (xe_bo_is_vram(bo) || xe_bo_is_stolen(bo))
                        xe_res_first(bo->ttm.resource, xe_vma_bo_offset(vma),
                                     xe_vma_size(vma), &curs);
+               else if (bo->is_devmem_external)
+                       xe_res_first_dma(bo->dma_addr, xe_vma_bo_offset(vma),
+                                       xe_vma_size(vma), &curs);
                else
                        xe_res_first_sg(xe_bo_sg(bo), xe_vma_bo_offset(vma),
                                        xe_vma_size(vma), &curs);
-- 
2.45.1