From: Chris Wilson Date: Fri, 6 Jul 2018 13:26:11 +0100 Subject: drm/i915/gtt: Control cache domain of dma_map_page() directly Git-commit: 66daec6b21840ea09af4c41f706867df7d81c820 Patch-mainline: v4.19-rc1 References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166 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: Chris Wilson Cc: Matthew Auld Reviewed-by: Matthew Auld Link: https://patchwork.freedesktop.org/patch/msgid/20180706122611.4142-2-chris@chris-wilson.co.uk Acked-by: Petr Tesarik --- drivers/gpu/drm/i915/i915_gem_gtt.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -564,6 +564,7 @@ static int __setup_page_dma(struct i915_ 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_s 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;