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9c9082b982
It used to be handy that we only had a couple of headers, but over time i915_drv.h has become unwieldy. Extract declarations to a separate header file corresponding to the implementation module, clarifying the modularity of the driver. Ensure the new header is self-contained, and do so with minimal further includes, using forward declarations as needed. Include the new header only where needed, and sort the modified include directives while at it and as needed. No functional changes. Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/f2b887002150acdf218385ea846f7aa617aa5f15.1565271681.git.jani.nikula@intel.com
32 lines
1.1 KiB
C
32 lines
1.1 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright © 2019 Intel Corporation
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*/
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#ifndef __I915_MEMCPY_H__
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#define __I915_MEMCPY_H__
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#include <linux/types.h>
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struct drm_i915_private;
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void i915_memcpy_init_early(struct drm_i915_private *i915);
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bool i915_memcpy_from_wc(void *dst, const void *src, unsigned long len);
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/* The movntdqa instructions used for memcpy-from-wc require 16-byte alignment,
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* as well as SSE4.1 support. i915_memcpy_from_wc() will report if it cannot
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* perform the operation. To check beforehand, pass in the parameters to
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* to i915_can_memcpy_from_wc() - since we only care about the low 4 bits,
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* you only need to pass in the minor offsets, page-aligned pointers are
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* always valid.
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*
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* For just checking for SSE4.1, in the foreknowledge that the future use
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* will be correctly aligned, just use i915_has_memcpy_from_wc().
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*/
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#define i915_can_memcpy_from_wc(dst, src, len) \
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i915_memcpy_from_wc((void *)((unsigned long)(dst) | (unsigned long)(src) | (len)), NULL, 0)
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#define i915_has_memcpy_from_wc() \
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i915_memcpy_from_wc(NULL, NULL, 0)
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#endif /* __I915_MEMCPY_H__ */
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