blob: 8df08b91021c3758a9d37216f426a21e9592c9a9 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
*
* Based on the original work in Linux by
* Copyright (c) 2006 SUSE Linux Products GmbH
* Copyright (c) 2006 Tejun Heo <teheo@suse.de>
*/
#define LOG_CATEGORY LOGC_DEVRES
#include <log.h>
#include <malloc.h>
#include <linux/compat.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <dm/device.h>
#include <dm/devres.h>
#include <dm/root.h>
#include <dm/util.h>
/** enum devres_phase - Shows where resource was allocated
*
* DEVRES_PHASE_BIND: In the bind() method
* DEVRES_PHASE_OFDATA: In the of_to_plat() method
* DEVRES_PHASE_PROBE: In the probe() method
*/
enum devres_phase {
DEVRES_PHASE_BIND,
DEVRES_PHASE_OFDATA,
DEVRES_PHASE_PROBE,
};
/**
* struct devres - Bookkeeping info for managed device resource
* @entry: List to associate this structure with a device
* @release: Callback invoked when this resource is released
* @probe: Show where this resource was allocated
* @name: Name of release function
* @size: Size of resource data
* @data: Resource data
*/
struct devres {
struct list_head entry;
dr_release_t release;
enum devres_phase phase;
#ifdef CONFIG_DEBUG_DEVRES
const char *name;
size_t size;
#endif
unsigned long long data[];
};
#ifdef CONFIG_DEBUG_DEVRES
static void set_node_dbginfo(struct devres *dr, const char *name, size_t size)
{
dr->name = name;
dr->size = size;
}
static void devres_log(struct udevice *dev, struct devres *dr,
const char *op)
{
log_debug("%s: DEVRES %3s %p %s (%lu bytes)\n", dev->name, op, dr,
dr->name, (unsigned long)dr->size);
}
#else /* CONFIG_DEBUG_DEVRES */
#define set_node_dbginfo(dr, n, s) do {} while (0)
#define devres_log(dev, dr, op) do {} while (0)
#endif
#if CONFIG_DEBUG_DEVRES
void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
const char *name)
#else
void *_devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
#endif
{
size_t tot_size = sizeof(struct devres) + size;
struct devres *dr;
dr = kmalloc(tot_size, gfp);
if (unlikely(!dr))
return NULL;
INIT_LIST_HEAD(&dr->entry);
dr->release = release;
set_node_dbginfo(dr, name, size);
return dr->data;
}
void devres_free(void *res)
{
if (res) {
struct devres *dr = container_of(res, struct devres, data);
assert_noisy(list_empty(&dr->entry));
kfree(dr);
}
}
void devres_add(struct udevice *dev, void *res)
{
struct devres *dr = container_of(res, struct devres, data);
devres_log(dev, dr, "ADD");
assert_noisy(list_empty(&dr->entry));
if (dev_get_flags(dev) & DM_FLAG_PLATDATA_VALID)
dr->phase = DEVRES_PHASE_PROBE;
else if (dev_get_flags(dev) & DM_FLAG_BOUND)
dr->phase = DEVRES_PHASE_OFDATA;
else
dr->phase = DEVRES_PHASE_BIND;
list_add_tail(&dr->entry, &dev->devres_head);
}
void *devres_find(struct udevice *dev, dr_release_t release,
dr_match_t match, void *match_data)
{
struct devres *dr;
list_for_each_entry_reverse(dr, &dev->devres_head, entry) {
if (dr->release != release)
continue;
if (match && !match(dev, dr->data, match_data))
continue;
return dr->data;
}
return NULL;
}
void *devres_get(struct udevice *dev, void *new_res,
dr_match_t match, void *match_data)
{
struct devres *new_dr = container_of(new_res, struct devres, data);
void *res;
res = devres_find(dev, new_dr->release, match, match_data);
if (!res) {
devres_add(dev, new_res);
res = new_res;
new_res = NULL;
}
devres_free(new_res);
return res;
}
void *devres_remove(struct udevice *dev, dr_release_t release,
dr_match_t match, void *match_data)
{
void *res;
res = devres_find(dev, release, match, match_data);
if (res) {
struct devres *dr = container_of(res, struct devres, data);
list_del_init(&dr->entry);
devres_log(dev, dr, "REM");
}
return res;
}
int devres_destroy(struct udevice *dev, dr_release_t release,
dr_match_t match, void *match_data)
{
void *res;
res = devres_remove(dev, release, match, match_data);
if (unlikely(!res))
return -ENOENT;
devres_free(res);
return 0;
}
int devres_release(struct udevice *dev, dr_release_t release,
dr_match_t match, void *match_data)
{
void *res;
res = devres_remove(dev, release, match, match_data);
if (unlikely(!res))
return -ENOENT;
(*release)(dev, res);
devres_free(res);
return 0;
}
static void release_nodes(struct udevice *dev, struct list_head *head,
bool probe_and_ofdata_only)
{
struct devres *dr, *tmp;
list_for_each_entry_safe_reverse(dr, tmp, head, entry) {
if (probe_and_ofdata_only && dr->phase == DEVRES_PHASE_BIND)
break;
devres_log(dev, dr, "REL");
dr->release(dev, dr->data);
list_del(&dr->entry);
kfree(dr);
}
}
void devres_release_probe(struct udevice *dev)
{
release_nodes(dev, &dev->devres_head, true);
}
void devres_release_all(struct udevice *dev)
{
release_nodes(dev, &dev->devres_head, false);
}
#ifdef CONFIG_DEBUG_DEVRES
static char *const devres_phase_name[] = {"BIND", "OFDATA", "PROBE"};
static void dump_resources(struct udevice *dev, int depth)
{
struct devres *dr;
struct udevice *child;
printf("- %s\n", dev->name);
list_for_each_entry(dr, &dev->devres_head, entry)
printf(" %p (%lu byte) %s %s\n", dr,
(unsigned long)dr->size, dr->name,
devres_phase_name[dr->phase]);
device_foreach_child(child, dev)
dump_resources(child, depth + 1);
}
void dm_dump_devres(void)
{
struct udevice *root;
root = dm_root();
if (root)
dump_resources(root, 0);
}
void devres_get_stats(const struct udevice *dev, struct devres_stats *stats)
{
struct devres *dr;
stats->allocs = 0;
stats->total_size = 0;
list_for_each_entry(dr, &dev->devres_head, entry) {
stats->allocs++;
stats->total_size += dr->size;
}
}
#endif
/*
* Managed kmalloc/kfree
*/
static void devm_kmalloc_release(struct udevice *dev, void *res)
{
/* noop */
}
static int devm_kmalloc_match(struct udevice *dev, void *res, void *data)
{
return res == data;
}
void *devm_kmalloc(struct udevice *dev, size_t size, gfp_t gfp)
{
void *data;
data = _devres_alloc(devm_kmalloc_release, size, gfp);
if (unlikely(!data))
return NULL;
devres_add(dev, data);
return data;
}
void devm_kfree(struct udevice *dev, void *p)
{
int rc;
rc = devres_destroy(dev, devm_kmalloc_release, devm_kmalloc_match, p);
assert_noisy(!rc);
}