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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2019-12-11 14:04:37 +0300 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-12-12 01:40:41 +0300 |
| commit | 6aacb5a3b0bccfa207ef2710f106020c1d749f1d (patch) | |
| tree | 3481faf9d8deb5f95a8c1b4e624c8b6299e99b02 /drivers/gpu/drm/i915/i915_memcpy.h | |
| parent | 51696691aba3d1a3e74a9ad9e615abd06532a11e (diff) | |
| download | linux-6aacb5a3b0bccfa207ef2710f106020c1d749f1d.tar.xz | |
drm/i915: Align start for memcpy_from_wc
The movntqda requires 16-byte alignment for the source pointer. Avoid
falling back to clflush if the source pointer is misaligned by doing the
doing a small uncached memcpy to fixup the alignments.
v2: Turn the unaligned copy into a genuine helper
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191211110437.4082687-5-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/i915_memcpy.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_memcpy.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_memcpy.h b/drivers/gpu/drm/i915/i915_memcpy.h index 970d84b16987..e36d30edd987 100644 --- a/drivers/gpu/drm/i915/i915_memcpy.h +++ b/drivers/gpu/drm/i915/i915_memcpy.h @@ -11,7 +11,9 @@ struct drm_i915_private; void i915_memcpy_init_early(struct drm_i915_private *i915); + bool i915_memcpy_from_wc(void *dst, const void *src, unsigned long len); +void i915_unaligned_memcpy_from_wc(void *dst, void *src, unsigned long len); /* The movntdqa instructions used for memcpy-from-wc require 16-byte alignment, * as well as SSE4.1 support. i915_memcpy_from_wc() will report if it cannot |