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
11struct drm_i915_private;
12
13void i915_memcpy_init_early(struct drm_i915_private *i915);
14bool 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__ */