9659dd2b30
Add a variant of shmem_read() that takes a iosys_map pointer rather than a plain pointer as argument. It's mostly a copy __shmem_rw() but adapting the api and removing the write support since there's currently only need to use iosys_map as destination. Reworking __shmem_rw() to share the implementation was tempting, but finding a good balance between reuse and clarity pushed towards a little code duplication. Since the function is small, just add the similar function with a copy/paste/adapt approach. v2: Add an offset as argument and instead of using a map iterator, use the offset to keep track of where we are writing data to. Cc: Matt Roper <matthew.d.roper@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Cc: David Airlie <airlied@linux.ie> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Matthew Auld <matthew.auld@intel.com> Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com> Reviewed-by: Matt Atwood <matthew.s.atwood@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220216174147.3073235-4-lucas.demarchi@intel.com
27 lines
745 B
C
27 lines
745 B
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright © 2020 Intel Corporation
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*/
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#ifndef SHMEM_UTILS_H
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#define SHMEM_UTILS_H
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#include <linux/types.h>
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struct iosys_map;
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struct drm_i915_gem_object;
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struct file;
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struct file *shmem_create_from_data(const char *name, void *data, size_t len);
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struct file *shmem_create_from_object(struct drm_i915_gem_object *obj);
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void *shmem_pin_map(struct file *file);
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void shmem_unpin_map(struct file *file, void *ptr);
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int shmem_read_to_iosys_map(struct file *file, loff_t off,
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struct iosys_map *map, size_t map_off, size_t len);
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int shmem_read(struct file *file, loff_t off, void *dst, size_t len);
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int shmem_write(struct file *file, loff_t off, void *src, size_t len);
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#endif /* SHMEM_UTILS_H */
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