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 --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 */