1 /* $NetBSD: i915_memcpy.h,v 1.2 2021/12/18 23:45:28 riastradh Exp $ */ 2 3 /* SPDX-License-Identifier: MIT */ 4 /* 5 * Copyright © 2019 Intel Corporation 6 */ 7 8 #ifndef __I915_MEMCPY_H__ 9 #define __I915_MEMCPY_H__ 10 11 #include <linux/types.h> 12 13 struct drm_i915_private; 14 15 void i915_memcpy_init_early(struct drm_i915_private *i915); 16 17 bool i915_memcpy_from_wc(void *dst, const void *src, unsigned long len); 18 void i915_unaligned_memcpy_from_wc(void *dst, void *src, unsigned long len); 19 20 /* The movntdqa instructions used for memcpy-from-wc require 16-byte alignment, 21 * as well as SSE4.1 support. i915_memcpy_from_wc() will report if it cannot 22 * perform the operation. To check beforehand, pass in the parameters to 23 * to i915_can_memcpy_from_wc() - since we only care about the low 4 bits, 24 * you only need to pass in the minor offsets, page-aligned pointers are 25 * always valid. 26 * 27 * For just checking for SSE4.1, in the foreknowledge that the future use 28 * will be correctly aligned, just use i915_has_memcpy_from_wc(). 29 */ 30 #define i915_can_memcpy_from_wc(dst, src, len) \ 31 i915_memcpy_from_wc((void *)((unsigned long)(dst) | (unsigned long)(src) | (len)), NULL, 0) 32 33 #define i915_has_memcpy_from_wc() \ 34 i915_memcpy_from_wc(NULL, NULL, 0) 35 36 #endif /* __I915_MEMCPY_H__ */ 37