From: "Wen, Kui" <kui.wen@xxxxxxxxx>
When user space does mmap, kernel would map the physical page of local memory
to virtual memory address. The r->sgt.pfn is page address allocated from
local memory and the local memory region is from 0 to LMEM size. Hence the
r->sgt.pfn is possible to be 0, but this is normal case.
Signed-off-by: Kui Wen <kui.wen@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_mm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_mm.c b/drivers/gpu/drm/i915/i915_mm.c
index 43039dc8c607..dcf6b3e5bfdf 100644
--- a/drivers/gpu/drm/i915/i915_mm.c
+++ b/drivers/gpu/drm/i915/i915_mm.c
@@ -62,7 +62,7 @@ static int remap_sg(pte_t *pte, unsigned long addr, void *data)
{
struct remap_pfn *r = data;
- if (GEM_WARN_ON(!r->sgt.pfn))
+ if (GEM_WARN_ON(!use_dma(r->iobase) && !r->sgt.pfn))
return -EINVAL;
/* Special PTE are not associated with any struct page */
--
2.26.2
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