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>
21 * struct devres - Bookkeeping info for managed device resource
22 * @entry: List to associate this structure with a device
23 * @release: Callback invoked when this resource is released
24 * @probe: Flag to show when this resource was allocated
25 (true = probe, false = bind)
26 * @name: Name of release function
27 * @size: Size of resource data
28 * @data: Resource data
31 struct list_head entry;
34 #ifdef CONFIG_DEBUG_DEVRES
38 unsigned long long data[];
41 #ifdef CONFIG_DEBUG_DEVRES
42 static void set_node_dbginfo(struct devres *dr, const char *name, size_t size)
48 static void devres_log(struct udevice *dev, struct devres *dr,
51 log_debug("%s: DEVRES %3s %p %s (%lu bytes)\n", dev->name, op, dr,
52 dr->name, (unsigned long)dr->size);
54 #else /* CONFIG_DEBUG_DEVRES */
55 #define set_node_dbginfo(dr, n, s) do {} while (0)
56 #define devres_log(dev, dr, op) do {} while (0)
59 #if CONFIG_DEBUG_DEVRES
60 void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
63 void *_devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
66 size_t tot_size = sizeof(struct devres) + size;
69 dr = kmalloc(tot_size, gfp);
73 INIT_LIST_HEAD(&dr->entry);
74 dr->release = release;
75 set_node_dbginfo(dr, name, size);
80 void devres_free(void *res)
83 struct devres *dr = container_of(res, struct devres, data);
85 assert_noisy(list_empty(&dr->entry));
90 void devres_add(struct udevice *dev, void *res)
92 struct devres *dr = container_of(res, struct devres, data);
94 devres_log(dev, dr, "ADD");
95 assert_noisy(list_empty(&dr->entry));
96 dr->probe = dev->flags & DM_FLAG_BOUND ? true : false;
97 list_add_tail(&dr->entry, &dev->devres_head);
100 void *devres_find(struct udevice *dev, dr_release_t release,
101 dr_match_t match, void *match_data)
105 list_for_each_entry_reverse(dr, &dev->devres_head, entry) {
106 if (dr->release != release)
108 if (match && !match(dev, dr->data, match_data))
116 void *devres_get(struct udevice *dev, void *new_res,
117 dr_match_t match, void *match_data)
119 struct devres *new_dr = container_of(new_res, struct devres, data);
122 res = devres_find(dev, new_dr->release, match, match_data);
124 devres_add(dev, new_res);
128 devres_free(new_res);
133 void *devres_remove(struct udevice *dev, dr_release_t release,
134 dr_match_t match, void *match_data)
138 res = devres_find(dev, release, match, match_data);
140 struct devres *dr = container_of(res, struct devres, data);
142 list_del_init(&dr->entry);
143 devres_log(dev, dr, "REM");
149 int devres_destroy(struct udevice *dev, dr_release_t release,
150 dr_match_t match, void *match_data)
154 res = devres_remove(dev, release, match, match_data);
162 int devres_release(struct udevice *dev, dr_release_t release,
163 dr_match_t match, void *match_data)
167 res = devres_remove(dev, release, match, match_data);
171 (*release)(dev, res);
176 static void release_nodes(struct udevice *dev, struct list_head *head,
179 struct devres *dr, *tmp;
181 list_for_each_entry_safe_reverse(dr, tmp, head, entry) {
182 if (probe_only && !dr->probe)
184 devres_log(dev, dr, "REL");
185 dr->release(dev, dr->data);
186 list_del(&dr->entry);
191 void devres_release_probe(struct udevice *dev)
193 release_nodes(dev, &dev->devres_head, true);
196 void devres_release_all(struct udevice *dev)
198 release_nodes(dev, &dev->devres_head, false);
201 #ifdef CONFIG_DEBUG_DEVRES
202 static void dump_resources(struct udevice *dev, int depth)
205 struct udevice *child;
207 printf("- %s\n", dev->name);
209 list_for_each_entry(dr, &dev->devres_head, entry)
210 printf(" %p (%lu byte) %s %s\n", dr,
211 (unsigned long)dr->size, dr->name,
212 dr->probe ? "PROBE" : "BIND");
214 list_for_each_entry(child, &dev->child_head, sibling_node)
215 dump_resources(child, depth + 1);
218 void dm_dump_devres(void)
220 struct udevice *root;
224 dump_resources(root, 0);
229 * Managed kmalloc/kfree
231 static void devm_kmalloc_release(struct udevice *dev, void *res)
236 static int devm_kmalloc_match(struct udevice *dev, void *res, void *data)
241 void *devm_kmalloc(struct udevice *dev, size_t size, gfp_t gfp)
245 data = _devres_alloc(devm_kmalloc_release, size, gfp);
249 devres_add(dev, data);
254 void devm_kfree(struct udevice *dev, void *p)
258 rc = devres_destroy(dev, devm_kmalloc_release, devm_kmalloc_match, p);