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Commit 66daec6b authored by Chris Wilson's avatar Chris Wilson
Browse files

drm/i915/gtt: Control cache domain of dma_map_page() directly 



We already maually control the CPU cache for our page table directories,
so we can tell the dma mapper to skip doing it as well.

Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: default avatarMatthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180706122611.4142-2-chris@chris-wilson.co.uk
parent 58174eac

drivers/gpu/drm/i915/i915_gem_gtt.c

+2 −0
Original line number Diff line number Diff line
@@ -564,6 +564,7 @@ static int __setup_page_dma(struct i915_address_space *vm, 
	p->daddr = dma_map_page_attrs(vm->dma,

				      p->page, 0, PAGE_SIZE,

				      PCI_DMA_BIDIRECTIONAL,

				      DMA_ATTR_SKIP_CPU_SYNC |

				      DMA_ATTR_NO_WARN);

	if (unlikely(dma_mapping_error(vm->dma, p->daddr))) {

		vm_free_page(vm, p->page);
@@ -648,6 +649,7 @@ setup_scratch_page(struct i915_address_space *vm, gfp_t gfp) 
		addr = dma_map_page_attrs(vm->dma,

					  page, 0, size,

					  PCI_DMA_BIDIRECTIONAL,

					  DMA_ATTR_SKIP_CPU_SYNC |

					  DMA_ATTR_NO_WARN);

		if (unlikely(dma_mapping_error(vm->dma, addr)))

			goto free_page;