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 15 bool i915_memcpy_from_wc(void *dst, const void *src, unsigned long len); 16 void i915_unaligned_memcpy_from_wc(void *dst, void *src, unsigned long len); 17 18 /* The movntdqa instructions used for memcpy-from-wc require 16-byte alignment, 19 * as well as SSE4.1 support. i915_memcpy_from_wc() will report if it cannot 20 * perform the operation. To check beforehand, pass in the parameters to 21 * to i915_can_memcpy_from_wc() - since we only care about the low 4 bits, 22 * you only need to pass in the minor offsets, page-aligned pointers are 23 * always valid. 24 * 25 * For just checking for SSE4.1, in the foreknowledge that the future use 26 * will be correctly aligned, just use i915_has_memcpy_from_wc(). 27 */ 28 #define i915_can_memcpy_from_wc(dst, src, len) \ 29 i915_memcpy_from_wc((void *)((unsigned long)(dst) | (unsigned long)(src) | (len)), NULL, 0) 30 31 #define i915_has_memcpy_from_wc() \ 32 i915_memcpy_from_wc(NULL, NULL, 0) 33 34 #endif /* __I915_MEMCPY_H__ */ 35