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.zh...@intel.com>
---
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
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