1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
5 * Based on the original work in Linux by
6 * Copyright (c) 2006 SUSE Linux Products GmbH
7 * Copyright (c) 2006 Tejun Heo <teheo@suse.de>
10 #define LOG_CATEGORY LOGC_DEVRES
13 #include <linux/compat.h>
14 #include <linux/kernel.h>
15 #include <linux/list.h>
16 #include <dm/device.h>
17 #include <dm/devres.h>
21 /** enum devres_phase - Shows where resource was allocated
23 * DEVRES_PHASE_BIND: In the bind() method
24 * DEVRES_PHASE_OFDATA: In the ofdata_to_platdata() method
25 * DEVRES_PHASE_PROBE: In the probe() method
34 * struct devres - Bookkeeping info for managed device resource
35 * @entry: List to associate this structure with a device
36 * @release: Callback invoked when this resource is released
37 * @probe: Show where this resource was allocated
38 * @name: Name of release function
39 * @size: Size of resource data
40 * @data: Resource data
43 struct list_head entry;
45 enum devres_phase phase;
46 #ifdef CONFIG_DEBUG_DEVRES
50 unsigned long long data[];
53 #ifdef CONFIG_DEBUG_DEVRES
54 static void set_node_dbginfo(struct devres *dr, const char *name, size_t size)
60 static void devres_log(struct udevice *dev, struct devres *dr,
63 log_debug("%s: DEVRES %3s %p %s (%lu bytes)\n", dev->name, op, dr,
64 dr->name, (unsigned long)dr->size);
66 #else /* CONFIG_DEBUG_DEVRES */
67 #define set_node_dbginfo(dr, n, s) do {} while (0)
68 #define devres_log(dev, dr, op) do {} while (0)
71 #if CONFIG_DEBUG_DEVRES
72 void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
75 void *_devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
78 size_t tot_size = sizeof(struct devres) + size;
81 dr = kmalloc(tot_size, gfp);
85 INIT_LIST_HEAD(&dr->entry);
86 dr->release = release;
87 set_node_dbginfo(dr, name, size);
92 void devres_free(void *res)
95 struct devres *dr = container_of(res, struct devres, data);
97 assert_noisy(list_empty(&dr->entry));
102 void devres_add(struct udevice *dev, void *res)
104 struct devres *dr = container_of(res, struct devres, data);
106 devres_log(dev, dr, "ADD");
107 assert_noisy(list_empty(&dr->entry));
108 if (dev->flags & DM_FLAG_PLATDATA_VALID)
109 dr->phase = DEVRES_PHASE_PROBE;
110 else if (dev->flags & DM_FLAG_BOUND)
111 dr->phase = DEVRES_PHASE_OFDATA;
113 dr->phase = DEVRES_PHASE_BIND;
114 list_add_tail(&dr->entry, &dev->devres_head);
117 void *devres_find(struct udevice *dev, dr_release_t release,
118 dr_match_t match, void *match_data)
122 list_for_each_entry_reverse(dr, &dev->devres_head, entry) {
123 if (dr->release != release)
125 if (match && !match(dev, dr->data, match_data))
133 void *devres_get(struct udevice *dev, void *new_res,
134 dr_match_t match, void *match_data)
136 struct devres *new_dr = container_of(new_res, struct devres, data);
139 res = devres_find(dev, new_dr->release, match, match_data);
141 devres_add(dev, new_res);
145 devres_free(new_res);
150 void *devres_remove(struct udevice *dev, dr_release_t release,
151 dr_match_t match, void *match_data)
155 res = devres_find(dev, release, match, match_data);
157 struct devres *dr = container_of(res, struct devres, data);
159 list_del_init(&dr->entry);
160 devres_log(dev, dr, "REM");
166 int devres_destroy(struct udevice *dev, dr_release_t release,
167 dr_match_t match, void *match_data)
171 res = devres_remove(dev, release, match, match_data);
179 int devres_release(struct udevice *dev, dr_release_t release,
180 dr_match_t match, void *match_data)
184 res = devres_remove(dev, release, match, match_data);
188 (*release)(dev, res);
193 static void release_nodes(struct udevice *dev, struct list_head *head,
194 bool probe_and_ofdata_only)
196 struct devres *dr, *tmp;
198 list_for_each_entry_safe_reverse(dr, tmp, head, entry) {
199 if (probe_and_ofdata_only && dr->phase == DEVRES_PHASE_BIND)
201 devres_log(dev, dr, "REL");
202 dr->release(dev, dr->data);
203 list_del(&dr->entry);
208 void devres_release_probe(struct udevice *dev)
210 release_nodes(dev, &dev->devres_head, true);
213 void devres_release_all(struct udevice *dev)
215 release_nodes(dev, &dev->devres_head, false);
218 #ifdef CONFIG_DEBUG_DEVRES
219 static char *const devres_phase_name[] = {"BIND", "OFDATA", "PROBE"};
221 static void dump_resources(struct udevice *dev, int depth)
224 struct udevice *child;
226 printf("- %s\n", dev->name);
228 list_for_each_entry(dr, &dev->devres_head, entry)
229 printf(" %p (%lu byte) %s %s\n", dr,
230 (unsigned long)dr->size, dr->name,
231 devres_phase_name[dr->phase]);
233 list_for_each_entry(child, &dev->child_head, sibling_node)
234 dump_resources(child, depth + 1);
237 void dm_dump_devres(void)
239 struct udevice *root;
243 dump_resources(root, 0);
246 void devres_get_stats(const struct udevice *dev, struct devres_stats *stats)
251 stats->total_size = 0;
252 list_for_each_entry(dr, &dev->devres_head, entry) {
254 stats->total_size += dr->size;
261 * Managed kmalloc/kfree
263 static void devm_kmalloc_release(struct udevice *dev, void *res)
268 static int devm_kmalloc_match(struct udevice *dev, void *res, void *data)
273 void *devm_kmalloc(struct udevice *dev, size_t size, gfp_t gfp)
277 data = _devres_alloc(devm_kmalloc_release, size, gfp);
281 devres_add(dev, data);
286 void devm_kfree(struct udevice *dev, void *p)
290 rc = devres_destroy(dev, devm_kmalloc_release, devm_kmalloc_match, p);