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__ */ 33