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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 <chris@chris-wilson.co.uk>
Reviewed-by: Brad Volkin <bradley.d.volkin@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2014-03-07 08:30:37 +00:00 committed by Daniel Vetter
parent 17793c9a46
commit c2831a94b5
1 changed files with 2 additions and 3 deletions
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5
drivers/gpu/drm/i915/i915_gem.c
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@ -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);