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