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>
20 /** enum devres_phase - Shows where resource was allocated
22 * DEVRES_PHASE_BIND: In the bind() method
23 * DEVRES_PHASE_PROBE: In the probe() method
31 * struct devres - Bookkeeping info for managed device resource
32 * @entry: List to associate this structure with a device
33 * @release: Callback invoked when this resource is released
34 * @probe: Show where this resource was allocated
35 * @name: Name of release function
36 * @size: Size of resource data
37 * @data: Resource data
40 struct list_head entry;
42 enum devres_phase phase;
43 #ifdef CONFIG_DEBUG_DEVRES
47 unsigned long long data[];
50 #ifdef CONFIG_DEBUG_DEVRES
51 static void set_node_dbginfo(struct devres *dr, const char *name, size_t size)
57 static void devres_log(struct udevice *dev, struct devres *dr,
60 log_debug("%s: DEVRES %3s %p %s (%lu bytes)\n", dev->name, op, dr,
61 dr->name, (unsigned long)dr->size);
63 #else /* CONFIG_DEBUG_DEVRES */
64 #define set_node_dbginfo(dr, n, s) do {} while (0)
65 #define devres_log(dev, dr, op) do {} while (0)
68 #if CONFIG_DEBUG_DEVRES
69 void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
72 void *_devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
75 size_t tot_size = sizeof(struct devres) + size;
78 dr = kmalloc(tot_size, gfp);
82 INIT_LIST_HEAD(&dr->entry);
83 dr->release = release;
84 set_node_dbginfo(dr, name, size);
89 void devres_free(void *res)
92 struct devres *dr = container_of(res, struct devres, data);
94 assert_noisy(list_empty(&dr->entry));
99 void devres_add(struct udevice *dev, void *res)
101 struct devres *dr = container_of(res, struct devres, data);
103 devres_log(dev, dr, "ADD");
104 assert_noisy(list_empty(&dr->entry));
105 dr->phase = dev->flags & DM_FLAG_BOUND ? DEVRES_PHASE_PROBE :
107 list_add_tail(&dr->entry, &dev->devres_head);
110 void *devres_find(struct udevice *dev, dr_release_t release,
111 dr_match_t match, void *match_data)
115 list_for_each_entry_reverse(dr, &dev->devres_head, entry) {
116 if (dr->release != release)
118 if (match && !match(dev, dr->data, match_data))
126 void *devres_get(struct udevice *dev, void *new_res,
127 dr_match_t match, void *match_data)
129 struct devres *new_dr = container_of(new_res, struct devres, data);
132 res = devres_find(dev, new_dr->release, match, match_data);
134 devres_add(dev, new_res);
138 devres_free(new_res);
143 void *devres_remove(struct udevice *dev, dr_release_t release,
144 dr_match_t match, void *match_data)
148 res = devres_find(dev, release, match, match_data);
150 struct devres *dr = container_of(res, struct devres, data);
152 list_del_init(&dr->entry);
153 devres_log(dev, dr, "REM");
159 int devres_destroy(struct udevice *dev, dr_release_t release,
160 dr_match_t match, void *match_data)
164 res = devres_remove(dev, release, match, match_data);
172 int devres_release(struct udevice *dev, dr_release_t release,
173 dr_match_t match, void *match_data)
177 res = devres_remove(dev, release, match, match_data);
181 (*release)(dev, res);
186 static void release_nodes(struct udevice *dev, struct list_head *head,
189 struct devres *dr, *tmp;
191 list_for_each_entry_safe_reverse(dr, tmp, head, entry) {
192 if (probe_only && dr->phase != DEVRES_PHASE_PROBE)
194 devres_log(dev, dr, "REL");
195 dr->release(dev, dr->data);
196 list_del(&dr->entry);
201 void devres_release_probe(struct udevice *dev)
203 release_nodes(dev, &dev->devres_head, true);
206 void devres_release_all(struct udevice *dev)
208 release_nodes(dev, &dev->devres_head, false);
211 #ifdef CONFIG_DEBUG_DEVRES
212 static void dump_resources(struct udevice *dev, int depth)
215 struct udevice *child;
217 printf("- %s\n", dev->name);
219 list_for_each_entry(dr, &dev->devres_head, entry)
220 printf(" %p (%lu byte) %s %s\n", dr,
221 (unsigned long)dr->size, dr->name,
222 dr->phase == DEVRES_PHASE_PROBE ? "PROBE" : "BIND");
224 list_for_each_entry(child, &dev->child_head, sibling_node)
225 dump_resources(child, depth + 1);
228 void dm_dump_devres(void)
230 struct udevice *root;
234 dump_resources(root, 0);
237 void devres_get_stats(const struct udevice *dev, struct devres_stats *stats)
242 stats->total_size = 0;
243 list_for_each_entry(dr, &dev->devres_head, entry) {
245 stats->total_size += dr->size;
252 * Managed kmalloc/kfree
254 static void devm_kmalloc_release(struct udevice *dev, void *res)
259 static int devm_kmalloc_match(struct udevice *dev, void *res, void *data)
264 void *devm_kmalloc(struct udevice *dev, size_t size, gfp_t gfp)
268 data = _devres_alloc(devm_kmalloc_release, size, gfp);
272 devres_add(dev, data);
277 void devm_kfree(struct udevice *dev, void *p)
281 rc = devres_destroy(dev, devm_kmalloc_release, devm_kmalloc_match, p);