/* SPDX-License-Identifier: MIT */ /* * Copyright © 2019 Intel Corporation */ #ifndef __I915_MEMCPY_H__ #define __I915_MEMCPY_H__ #include <linux/types.h> struct drm_i915_private; void i915_memcpy_init_early(struct drm_i915_private *i915); bool i915_memcpy_from_wc(void *dst, const void *src, unsigned long len); void i915_unaligned_memcpy_from_wc(void *dst, const void *src, unsigned long len); /* The movntdqa instructions used for memcpy-from-wc require 16-byte alignment, * as well as SSE4.1 support. i915_memcpy_from_wc() will report if it cannot * perform the operation. To check beforehand, pass in the parameters to * to i915_can_memcpy_from_wc() - since we only care about the low 4 bits, * you only need to pass in the minor offsets, page-aligned pointers are * always valid. * * For just checking for SSE4.1, in the foreknowledge that the future use * will be correctly aligned, just use i915_has_memcpy_from_wc(). */ #define i915_can_memcpy_from_wc(dst, src, len) \ i915_memcpy_from_wc((void *)((unsigned long)(dst) | (unsigned long)(src) | (len)), NULL, 0) #define i915_has_memcpy_from_wc() \ i915_memcpy_from_wc(NULL, NULL, 0) #endif /* __I915_MEMCPY_H__ */