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290 lines
8.3 KiB
C
290 lines
8.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
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*
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* Based on the original work in Linux by
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* Copyright (c) 2006 SUSE Linux Products GmbH
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* Copyright (c) 2006 Tejun Heo <teheo@suse.de>
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* Copyright 2019 Google LLC
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*/
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#ifndef _DM_DEVRES_H
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#define _DM_DEVRES_H
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#include <linux/compat.h>
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struct udevice;
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/* device resource management */
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typedef void (*dr_release_t)(struct udevice *dev, void *res);
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typedef int (*dr_match_t)(struct udevice *dev, void *res, void *match_data);
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/**
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* struct devres_stats - Information about devres allocations for a device
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*
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* @allocs: Number of allocations
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* @total_size: Total size of allocations in bytes
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*/
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struct devres_stats {
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int allocs;
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int total_size;
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};
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#if CONFIG_IS_ENABLED(DEVRES)
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#ifdef CONFIG_DEBUG_DEVRES
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void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
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const char *name);
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#define _devres_alloc(release, size, gfp) \
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__devres_alloc(release, size, gfp, #release)
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#else
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void *_devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
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#endif
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/**
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* devres_alloc() - Allocate device resource data
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* @release: Release function devres will be associated with
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* @size: Allocation size
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* @gfp: Allocation flags
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*
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* Allocate devres of @size bytes. The allocated area is associated
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* with @release. The returned pointer can be passed to
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* other devres_*() functions.
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*
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* Return:
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* Pointer to allocated devres on success, NULL on failure.
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*/
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#define devres_alloc(release, size, gfp) \
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_devres_alloc(release, size, (gfp) | __GFP_ZERO)
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/**
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* devres_free() - Free device resource data
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* @res: Pointer to devres data to free
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*
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* Free devres created with devres_alloc().
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*/
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void devres_free(void *res);
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/**
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* devres_add() - Register device resource
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* @dev: Device to add resource to
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* @res: Resource to register
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*
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* Register devres @res to @dev. @res should have been allocated
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* using devres_alloc(). On driver detach, the associated release
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* function will be invoked and devres will be freed automatically.
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*/
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void devres_add(struct udevice *dev, void *res);
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/**
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* devres_find() - Find device resource
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* @dev: Device to lookup resource from
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* @release: Look for resources associated with this release function
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* @match: Match function (optional)
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* @match_data: Data for the match function
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*
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* Find the latest devres of @dev which is associated with @release
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* and for which @match returns 1. If @match is NULL, it's considered
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* to match all.
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*
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* Return: pointer to found devres, NULL if not found.
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*/
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void *devres_find(struct udevice *dev, dr_release_t release,
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dr_match_t match, void *match_data);
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/**
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* devres_get() - Find devres, if non-existent, add one atomically
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* @dev: Device to lookup or add devres for
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* @new_res: Pointer to new initialized devres to add if not found
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* @match: Match function (optional)
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* @match_data: Data for the match function
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*
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* Find the latest devres of @dev which has the same release function
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* as @new_res and for which @match return 1. If found, @new_res is
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* freed; otherwise, @new_res is added atomically.
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*
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* Return: pointer to found or added devres.
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*/
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void *devres_get(struct udevice *dev, void *new_res,
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dr_match_t match, void *match_data);
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/**
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* devres_remove() - Find a device resource and remove it
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* @dev: Device to find resource from
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* @release: Look for resources associated with this release function
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* @match: Match function (optional)
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* @match_data: Data for the match function
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*
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* Find the latest devres of @dev associated with @release and for
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* which @match returns 1. If @match is NULL, it's considered to
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* match all. If found, the resource is removed atomically and
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* returned.
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*
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* Return: pointer to removed devres on success, NULL if not found.
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*/
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void *devres_remove(struct udevice *dev, dr_release_t release,
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dr_match_t match, void *match_data);
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/**
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* devres_destroy() - Find a device resource and destroy it
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* @dev: Device to find resource from
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* @release: Look for resources associated with this release function
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* @match: Match function (optional)
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* @match_data: Data for the match function
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*
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* Find the latest devres of @dev associated with @release and for
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* which @match returns 1. If @match is NULL, it's considered to
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* match all. If found, the resource is removed atomically and freed.
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*
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* Note that the release function for the resource will not be called,
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* only the devres-allocated data will be freed. The caller becomes
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* responsible for freeing any other data.
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*
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* Return: 0 if devres is found and freed, -ENOENT if not found.
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*/
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int devres_destroy(struct udevice *dev, dr_release_t release,
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dr_match_t match, void *match_data);
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/**
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* devres_release() - Find a device resource and destroy it, calling release
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* @dev: Device to find resource from
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* @release: Look for resources associated with this release function
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* @match: Match function (optional)
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* @match_data: Data for the match function
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*
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* Find the latest devres of @dev associated with @release and for
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* which @match returns 1. If @match is NULL, it's considered to
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* match all. If found, the resource is removed atomically, the
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* release function called and the resource freed.
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*
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* Return: 0 if devres is found and freed, -ENOENT if not found.
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*/
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int devres_release(struct udevice *dev, dr_release_t release,
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dr_match_t match, void *match_data);
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/* managed devm_k.alloc/kfree for device drivers */
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/**
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* devm_kmalloc() - Resource-managed kmalloc
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* @dev: Device to allocate memory for
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* @size: Allocation size
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* @gfp: Allocation gfp flags
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*
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* Managed kmalloc. Memory allocated with this function is
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* automatically freed on driver detach. Like all other devres
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* resources, guaranteed alignment is unsigned long long.
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*
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* Return: pointer to allocated memory on success, NULL on failure.
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*/
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void *devm_kmalloc(struct udevice *dev, size_t size, gfp_t gfp);
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static inline void *devm_kzalloc(struct udevice *dev, size_t size, gfp_t gfp)
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{
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return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
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}
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static inline void *devm_kmalloc_array(struct udevice *dev,
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size_t n, size_t size, gfp_t flags)
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{
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if (size != 0 && n > SIZE_MAX / size)
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return NULL;
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return devm_kmalloc(dev, n * size, flags);
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}
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static inline void *devm_kcalloc(struct udevice *dev,
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size_t n, size_t size, gfp_t flags)
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{
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return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
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}
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/**
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* devm_kfree() - Resource-managed kfree
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* @dev: Device this memory belongs to
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* @ptr: Memory to free
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*
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* Free memory allocated with devm_kmalloc().
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*/
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void devm_kfree(struct udevice *dev, void *ptr);
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/* Get basic stats on allocations */
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void devres_get_stats(const struct udevice *dev, struct devres_stats *stats);
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#else /* ! DEVRES */
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static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
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{
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return kzalloc(size, gfp);
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}
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static inline void devres_free(void *res)
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{
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kfree(res);
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}
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static inline void devres_add(struct udevice *dev, void *res)
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{
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}
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static inline void *devres_find(struct udevice *dev, dr_release_t release,
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dr_match_t match, void *match_data)
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{
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return NULL;
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}
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static inline void *devres_get(struct udevice *dev, void *new_res,
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dr_match_t match, void *match_data)
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{
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return NULL;
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}
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static inline void *devres_remove(struct udevice *dev, dr_release_t release,
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dr_match_t match, void *match_data)
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{
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return NULL;
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}
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static inline int devres_destroy(struct udevice *dev, dr_release_t release,
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dr_match_t match, void *match_data)
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{
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return 0;
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}
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static inline int devres_release(struct udevice *dev, dr_release_t release,
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dr_match_t match, void *match_data)
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{
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return 0;
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}
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static inline void *devm_kmalloc(struct udevice *dev, size_t size, gfp_t gfp)
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{
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return kmalloc(size, gfp);
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}
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static inline void *devm_kzalloc(struct udevice *dev, size_t size, gfp_t gfp)
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{
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return kzalloc(size, gfp);
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}
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static inline void *devm_kmalloc_array(struct udevice *dev,
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size_t n, size_t size, gfp_t flags)
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{
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return kmalloc_array(n, size, flags);
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}
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static inline void *devm_kcalloc(struct udevice *dev,
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size_t n, size_t size, gfp_t flags)
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{
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return kcalloc(n, size, flags);
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}
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static inline void devm_kfree(struct udevice *dev, void *ptr)
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{
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kfree(ptr);
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}
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static inline void devres_get_stats(const struct udevice *dev,
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struct devres_stats *stats)
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{
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}
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#endif /* DEVRES */
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#endif /* _DM_DEVRES_H */
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