[RFC,30/60] drm/i915/lmem: Do not check r->sgt.pfn for NULL
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Message ID 20200710115757.290984-31-matthew.auld@intel.com
State New
Headers show
Series
  • DG1 LMEM enabling
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Commit Message

Matthew Auld July 10, 2020, 11:57 a.m. UTC
From: "Wen, Kui" <kui.wen@intel.com>

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@intel.com>
---
 drivers/gpu/drm/i915/i915_mm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
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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 */