fault_in_multipages_writeable() will load fault page into physical memory, then pread can run fast path, no need to run slow path Signed-off-by: Xiong Zhang <xiong.y.zhang@xxxxxxxxx> --- drivers/gpu/drm/i915/i915_gem.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index f194d7e..982df1e 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -459,6 +459,7 @@ i915_gem_shmem_pread(struct drm_device *dev, page_do_bit17_swizzling = obj_do_bit17_swizzling && (page_to_phys(page) & (1 << 17)) != 0; +read_again: ret = shmem_pread_fast(page, shmem_page_offset, page_length, user_data, page_do_bit17_swizzling, needs_clflush); @@ -475,6 +476,8 @@ i915_gem_shmem_pread(struct drm_device *dev, * and just continue. */ (void)ret; prefaulted = 1; + mutex_lock(&dev->struct_mutex); + goto read_again; } ret = shmem_pread_slow(page, shmem_page_offset, page_length, -- 1.8.3.2 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
