From c2831a94b5e77a407db0708816949d4a87416a8e Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 7 Mar 2014 08:30:37 +0000 Subject: [PATCH] drm/i915: Do not force non-caching copies for pwrite along shmem path We don't always want to write into main memory with pwrite. The shmem fast path in particular is used for memory that is cacheable - under such circumstances forcing the cache eviction is undesirable. As we will always flush the cache when targeting incoherent buffers, we can rely on that second pass to apply the cache coherency rules and so benefit from in-cache copies otherwise. Signed-off-by: Chris Wilson Reviewed-by: Brad Volkin Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_gem.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index da5d9ca98024..92b0b4164b1d 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -693,9 +693,8 @@ shmem_pwrite_fast(struct page *page, int shmem_page_offset, int page_length, if (needs_clflush_before) drm_clflush_virt_range(vaddr + shmem_page_offset, page_length); - ret = __copy_from_user_inatomic_nocache(vaddr + shmem_page_offset, - user_data, - page_length); + ret = __copy_from_user_inatomic(vaddr + shmem_page_offset, + user_data, page_length); if (needs_clflush_after) drm_clflush_virt_range(vaddr + shmem_page_offset, page_length); -- 2.11.0