root/drivers/gpu/drm/i915/i915_memcpy.h

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INCLUDED FROM


   1 /* SPDX-License-Identifier: MIT */
   2 /*
   3  * Copyright © 2019 Intel Corporation
   4  */
   5 
   6 #ifndef __I915_MEMCPY_H__
   7 #define __I915_MEMCPY_H__
   8 
   9 #include <linux/types.h>
  10 
  11 struct drm_i915_private;
  12 
  13 void i915_memcpy_init_early(struct drm_i915_private *i915);
  14 bool i915_memcpy_from_wc(void *dst, const void *src, unsigned long len);
  15 
  16 /* The movntdqa instructions used for memcpy-from-wc require 16-byte alignment,
  17  * as well as SSE4.1 support. i915_memcpy_from_wc() will report if it cannot
  18  * perform the operation. To check beforehand, pass in the parameters to
  19  * to i915_can_memcpy_from_wc() - since we only care about the low 4 bits,
  20  * you only need to pass in the minor offsets, page-aligned pointers are
  21  * always valid.
  22  *
  23  * For just checking for SSE4.1, in the foreknowledge that the future use
  24  * will be correctly aligned, just use i915_has_memcpy_from_wc().
  25  */
  26 #define i915_can_memcpy_from_wc(dst, src, len) \
  27         i915_memcpy_from_wc((void *)((unsigned long)(dst) | (unsigned long)(src) | (len)), NULL, 0)
  28 
  29 #define i915_has_memcpy_from_wc() \
  30         i915_memcpy_from_wc(NULL, NULL, 0)
  31 
  32 #endif /* __I915_MEMCPY_H__ */

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