/* * 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); }