1*4882a593Smuzhiyun /* SPDX-License-Identifier: MIT */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright © 2019 Intel Corporation 4*4882a593Smuzhiyun */ 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun #ifndef __I915_MEMCPY_H__ 7*4882a593Smuzhiyun #define __I915_MEMCPY_H__ 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #include <linux/types.h> 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun struct drm_i915_private; 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun void i915_memcpy_init_early(struct drm_i915_private *i915); 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun bool i915_memcpy_from_wc(void *dst, const void *src, unsigned long len); 16*4882a593Smuzhiyun void i915_unaligned_memcpy_from_wc(void *dst, void *src, unsigned long len); 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun /* The movntdqa instructions used for memcpy-from-wc require 16-byte alignment, 19*4882a593Smuzhiyun * as well as SSE4.1 support. i915_memcpy_from_wc() will report if it cannot 20*4882a593Smuzhiyun * perform the operation. To check beforehand, pass in the parameters to 21*4882a593Smuzhiyun * to i915_can_memcpy_from_wc() - since we only care about the low 4 bits, 22*4882a593Smuzhiyun * you only need to pass in the minor offsets, page-aligned pointers are 23*4882a593Smuzhiyun * always valid. 24*4882a593Smuzhiyun * 25*4882a593Smuzhiyun * For just checking for SSE4.1, in the foreknowledge that the future use 26*4882a593Smuzhiyun * will be correctly aligned, just use i915_has_memcpy_from_wc(). 27*4882a593Smuzhiyun */ 28*4882a593Smuzhiyun #define i915_can_memcpy_from_wc(dst, src, len) \ 29*4882a593Smuzhiyun i915_memcpy_from_wc((void *)((unsigned long)(dst) | (unsigned long)(src) | (len)), NULL, 0) 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun #define i915_has_memcpy_from_wc() \ 32*4882a593Smuzhiyun i915_memcpy_from_wc(NULL, NULL, 0) 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun #endif /* __I915_MEMCPY_H__ */ 35