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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/gpu/drm/i915/i915_memcpy.h | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_memcpy.h')
-rw-r--r-- | drivers/gpu/drm/i915/i915_memcpy.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_memcpy.h b/drivers/gpu/drm/i915/i915_memcpy.h new file mode 100644 index 0000000000..3df063a329 --- /dev/null +++ b/drivers/gpu/drm/i915/i915_memcpy.h @@ -0,0 +1,34 @@ +/* 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__ */ |