Re: [PATCH 1/1] drm/ttm: fix offset in VMAs with a pg_offs in ttm_bo_vm_access

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Am 28.07.20 um 20:27 schrieb Felix Kuehling:
VMAs with a pg_offs that's offset from the start of the vma_node need
to adjust the offset within the BO accordingly. This matches the
offset calculation in ttm_bo_vm_fault_reserved.

Signed-off-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
Tested-by: Laurent Morichetti <laurent.morichetti@xxxxxxx>

Reviewed-by: Christian König <christian.koenig@xxxxxxx>

Going to pick that up for inclusion in drm-misc-next.

---
  drivers/gpu/drm/ttm/ttm_bo_vm.c | 4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index 389128b8c4dd..60b41447bec8 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -405,8 +405,10 @@ static int ttm_bo_vm_access_kmap(struct ttm_buffer_object *bo,
  int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
  		     void *buf, int len, int write)
  {
-	unsigned long offset = (addr) - vma->vm_start;
  	struct ttm_buffer_object *bo = vma->vm_private_data;
+	unsigned long offset = (addr) - vma->vm_start +
+		((vma->vm_pgoff - drm_vma_node_start(&bo->base.vma_node))
+		 << PAGE_SHIFT);
  	int ret;
if (len < 1 || (offset + len) >> PAGE_SHIFT > bo->num_pages)

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