diff mbox series

[RFC,094/162] drm/i915/dg1: Do not check r->sgt.pfn for NULL

Message ID 20201127120718.454037-95-matthew.auld@intel.com (mailing list archive)
State New, archived
Headers show
Series DG1 + LMEM enabling | expand

Commit Message

Matthew Auld Nov. 27, 2020, 12:06 p.m. UTC
From: Kui Wen <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's 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(-)
diff mbox series


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 */