1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259
|
/*
* 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>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <linux/compat.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <dm/device.h>
#include <dm/root.h>
#include <dm/util.h>
/**
* 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: Flag to show when this resource was allocated
(true = probe, false = bind)
* @name: Name of release function
* @size: Size of resource data
* @data: Resource data
*/
struct devres {
struct list_head entry;
dr_release_t release;
bool probe;
#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)
{
printf("%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);
BUG_ON(!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");
BUG_ON(!list_empty(&dr->entry));
dr->probe = dev->flags & DM_FLAG_BOUND ? true : false;
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_only)
{
struct devres *dr, *tmp;
list_for_each_entry_safe_reverse(dr, tmp, head, entry) {
if (probe_only && !dr->probe)
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 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,
dr->probe ? "PROBE" : "BIND");
list_for_each_entry(child, &dev->child_head, sibling_node)
dump_resources(child, depth + 1);
}
void dm_dump_devres(void)
{
struct udevice *root;
root = dm_root();
if (root)
dump_resources(root, 0);
}
#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);
WARN_ON(rc);
}
|