diff options
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/core.c | 105 | ||||
| -rw-r--r-- | drivers/base/devres.c | 42 | ||||
| -rw-r--r-- | drivers/base/firmware_class.c | 838 | ||||
| -rw-r--r-- | drivers/base/platform.c | 41 | ||||
| -rw-r--r-- | drivers/base/power/main.c | 22 |
5 files changed, 904 insertions, 144 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index 5e6e00bc1652..abea76c36a4b 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -184,6 +184,17 @@ static void device_release(struct kobject *kobj) struct device *dev = kobj_to_dev(kobj); struct device_private *p = dev->p; + /* + * Some platform devices are driven without driver attached + * and managed resources may have been acquired. Make sure + * all resources are released. + * + * Drivers still can add resources into device after device + * is deleted but alive, so release devres here to avoid + * possible memory leak. + */ + devres_release_all(dev); + if (dev->release) dev->release(dev); else if (dev->type && dev->type->release) @@ -1196,13 +1207,6 @@ void device_del(struct device *dev) bus_remove_device(dev); driver_deferred_probe_del(dev); - /* - * Some platform devices are driven without driver attached - * and managed resources may have been acquired. Make sure - * all resources are released. - */ - devres_release_all(dev); - /* Notify the platform of the removal, in case they * need to do anything... */ @@ -1861,26 +1865,20 @@ void device_shutdown(void) */ #ifdef CONFIG_PRINTK -int __dev_printk(const char *level, const struct device *dev, - struct va_format *vaf) +static int +create_syslog_header(const struct device *dev, char *hdr, size_t hdrlen) { - char dict[128]; - const char *level_extra = ""; - size_t dictlen = 0; const char *subsys; - - if (!dev) - return printk("%s(NULL device *): %pV", level, vaf); + size_t pos = 0; if (dev->class) subsys = dev->class->name; else if (dev->bus) subsys = dev->bus->name; else - goto skip; + return 0; - dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen, - "SUBSYSTEM=%s", subsys); + pos += snprintf(hdr + pos, hdrlen - pos, "SUBSYSTEM=%s", subsys); /* * Add device identifier DEVICE=: @@ -1896,32 +1894,63 @@ int __dev_printk(const char *level, const struct device *dev, c = 'b'; else c = 'c'; - dictlen++; - dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen, - "DEVICE=%c%u:%u", - c, MAJOR(dev->devt), MINOR(dev->devt)); + pos++; + pos += snprintf(hdr + pos, hdrlen - pos, + "DEVICE=%c%u:%u", + c, MAJOR(dev->devt), MINOR(dev->devt)); } else if (strcmp(subsys, "net") == 0) { struct net_device *net = to_net_dev(dev); - dictlen++; - dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen, - "DEVICE=n%u", net->ifindex); + pos++; + pos += snprintf(hdr + pos, hdrlen - pos, + "DEVICE=n%u", net->ifindex); } else { - dictlen++; - dictlen += snprintf(dict + dictlen, sizeof(dict) - dictlen, - "DEVICE=+%s:%s", subsys, dev_name(dev)); + pos++; + pos += snprintf(hdr + pos, hdrlen - pos, + "DEVICE=+%s:%s", subsys, dev_name(dev)); } -skip: - if (level[2]) - level_extra = &level[2]; /* skip past KERN_SOH "L" */ - return printk_emit(0, level[1] - '0', - dictlen ? dict : NULL, dictlen, - "%s %s: %s%pV", - dev_driver_string(dev), dev_name(dev), - level_extra, vaf); + return pos; +} +EXPORT_SYMBOL(create_syslog_header); + +int dev_vprintk_emit(int level, const struct device *dev, + const char *fmt, va_list args) +{ + char hdr[128]; + size_t hdrlen; + + hdrlen = create_syslog_header(dev, hdr, sizeof(hdr)); + + return vprintk_emit(0, level, hdrlen ? hdr : NULL, hdrlen, fmt, args); +} +EXPORT_SYMBOL(dev_vprintk_emit); + +int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) +{ + va_list args; + int r; + + va_start(args, fmt); + + r = dev_vprintk_emit(level, dev, fmt, args); + + va_end(args); + + return r; +} +EXPORT_SYMBOL(dev_printk_emit); + +static int __dev_printk(const char *level, const struct device *dev, + struct va_format *vaf) +{ + if (!dev) + return printk("%s(NULL device *): %pV", level, vaf); + + return dev_printk_emit(level[1] - '0', dev, + "%s %s: %pV", + dev_driver_string(dev), dev_name(dev), vaf); } -EXPORT_SYMBOL(__dev_printk); int dev_printk(const char *level, const struct device *dev, const char *fmt, ...) @@ -1936,6 +1965,7 @@ int dev_printk(const char *level, const struct device *dev, vaf.va = &args; r = __dev_printk(level, dev, &vaf); + va_end(args); return r; @@ -1955,6 +1985,7 @@ int func(const struct device *dev, const char *fmt, ...) \ vaf.va = &args; \ \ r = __dev_printk(kern_level, dev, &vaf); \ + \ va_end(args); \ \ return r; \ diff --git a/drivers/base/devres.c b/drivers/base/devres.c index 2360adb7a58f..8731979d668a 100644 --- a/drivers/base/devres.c +++ b/drivers/base/devres.c @@ -144,6 +144,48 @@ EXPORT_SYMBOL_GPL(devres_alloc); #endif /** + * devres_for_each_res - Resource iterator + * @dev: Device to iterate resource from + * @release: Look for resources associated with this release function + * @match: Match function (optional) + * @match_data: Data for the match function + * @fn: Function to be called for each matched resource. + * @data: Data for @fn, the 3rd parameter of @fn + * + * Call @fn for each devres of @dev which is associated with @release + * and for which @match returns 1. + * + * RETURNS: + * void + */ +void devres_for_each_res(struct device *dev, dr_release_t release, + dr_match_t match, void *match_data, + void (*fn)(struct device *, void *, void *), + void *data) +{ + struct devres_node *node; + struct devres_node *tmp; + unsigned long flags; + + if (!fn) + return; + + spin_lock_irqsave(&dev->devres_lock, flags); + list_for_each_entry_safe_reverse(node, tmp, + &dev->devres_head, entry) { + struct devres *dr = container_of(node, struct devres, node); + + if (node->release != release) + continue; + if (match && !match(dev, dr->data, match_data)) + continue; + fn(dev, dr->data, data); + } + spin_unlock_irqrestore(&dev->devres_lock, flags); +} +EXPORT_SYMBOL_GPL(devres_for_each_res); + +/** * devres_free - Free device resource data * @res: Pointer to devres data to free * diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index 803cfc1597a9..6e210802c37b 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -21,6 +21,13 @@ #include <linux/firmware.h> #include <linux/slab.h> #include <linux/sched.h> +#include <linux/list.h> +#include <linux/async.h> +#include <linux/pm.h> +#include <linux/suspend.h> +#include <linux/syscore_ops.h> + +#include "base.h" MODULE_AUTHOR("Manuel Estrada Sainz"); MODULE_DESCRIPTION("Multi purpose firmware loading support"); @@ -85,23 +92,168 @@ static inline long firmware_loading_timeout(void) return loading_timeout > 0 ? loading_timeout * HZ : MAX_SCHEDULE_TIMEOUT; } -/* fw_lock could be moved to 'struct firmware_priv' but since it is just - * guarding for corner cases a global lock should be OK */ -static DEFINE_MUTEX(fw_lock); +struct firmware_cache { + /* firmware_buf instance will be added into the below list */ + spinlock_t lock; + struct list_head head; + int state; + +#ifdef CONFIG_PM_SLEEP + /* + * Names of firmware images which have been cached successfully + * will be added into the below list so that device uncache + * helper can trace which firmware images have been cached + * before. + */ + spinlock_t name_lock; + struct list_head fw_names; + + wait_queue_head_t wait_queue; + int cnt; + struct delayed_work work; + + struct notifier_block pm_notify; +#endif +}; -struct firmware_priv { +struct firmware_buf { + struct kref ref; + struct list_head list; struct completion completion; - struct firmware *fw; + struct firmware_cache *fwc; unsigned long status; + void *data; + size_t size; struct page **pages; int nr_pages; int page_array_size; + char fw_id[]; +}; + +struct fw_cache_entry { + struct list_head list; + char name[]; +}; + +struct firmware_priv { struct timer_list timeout; - struct device dev; bool nowait; - char fw_id[]; + struct device dev; + struct firmware_buf *buf; + struct firmware *fw; +}; + +struct fw_name_devm { + unsigned long magic; + char name[]; }; +#define to_fwbuf(d) container_of(d, struct firmware_buf, ref) + +#define FW_LOADER_NO_CACHE 0 +#define FW_LOADER_START_CACHE 1 + +static int fw_cache_piggyback_on_request(const char *name); + +/* fw_lock could be moved to 'struct firmware_priv' but since it is just + * guarding for corner cases a global lock should be OK */ +static DEFINE_MUTEX(fw_lock); + +static struct firmware_cache fw_cache; + +static struct firmware_buf *__allocate_fw_buf(const char *fw_name, + struct firmware_cache *fwc) +{ + struct firmware_buf *buf; + + buf = kzalloc(sizeof(*buf) + strlen(fw_name) + 1 , GFP_ATOMIC); + + if (!buf) + return buf; + + kref_init(&buf->ref); + strcpy(buf->fw_id, fw_name); + buf->fwc = fwc; + init_completion(&buf->completion); + + pr_debug("%s: fw-%s buf=%p\n", __func__, fw_name, buf); + + return buf; +} + +static struct firmware_buf *__fw_lookup_buf(const char *fw_name) +{ + struct firmware_buf *tmp; + struct firmware_cache *fwc = &fw_cache; + + list_for_each_entry(tmp, &fwc->head, list) + if (!strcmp(tmp->fw_id, fw_name)) + return tmp; + return NULL; +} + +static int fw_lookup_and_allocate_buf(const char *fw_name, + struct firmware_cache *fwc, + struct firmware_buf **buf) +{ + struct firmware_buf *tmp; + + spin_lock(&fwc->lock); + tmp = __fw_lookup_buf(fw_name); + if (tmp) { + kref_get(&tmp->ref); + spin_unlock(&fwc->lock); + *buf = tmp; + return 1; + } + tmp = __allocate_fw_buf(fw_name, fwc); + if (tmp) + list_add(&tmp->list, &fwc->head); + spin_unlock(&fwc->lock); + + *buf = tmp; + + return tmp ? 0 : -ENOMEM; +} + +static struct firmware_buf *fw_lookup_buf(const char *fw_name) +{ + struct firmware_buf *tmp; + struct firmware_cache *fwc = &fw_cache; + + spin_lock(&fwc->lock); + tmp = __fw_lookup_buf(fw_name); + spin_unlock(&fwc->lock); + + return tmp; +} + +static void __fw_free_buf(struct kref *ref) +{ + struct firmware_buf *buf = to_fwbuf(ref); + struct firmware_cache *fwc = buf->fwc; + int i; + + pr_debug("%s: fw-%s buf=%p data=%p size=%u\n", + __func__, buf->fw_id, buf, buf->data, + (unsigned int)buf->size); + + spin_lock(&fwc->lock); + list_del(&buf->list); + spin_unlock(&fwc->lock); + + vunmap(buf->data); + for (i = 0; i < buf->nr_pages; i++) + __free_page(buf->pages[i]); + kfree(buf->pages); + kfree(buf); +} + +static void fw_free_buf(struct firmware_buf *buf) +{ + kref_put(&buf->ref, __fw_free_buf); +} + static struct firmware_priv *to_firmware_priv(struct device *dev) { return container_of(dev, struct firmware_priv, dev); @@ -109,9 +261,10 @@ static struct firmware_priv *to_firmware_priv(struct device *dev) static void fw_load_abort(struct firmware_priv *fw_priv) { - set_bit(FW_STATUS_ABORT, &fw_priv->status); - wmb(); - complete(&fw_priv->completion); + struct firmware_buf *buf = fw_priv->buf; + + set_bit(FW_STATUS_ABORT, &buf->status); + complete_all(&buf->completion); } static ssize_t firmware_timeout_show(struct class *class, @@ -154,11 +307,7 @@ static struct class_attribute firmware_class_attrs[] = { static void fw_dev_release(struct device *dev) { struct firmware_priv *fw_priv = to_firmware_priv(dev); - int i; - for (i = 0; i < fw_priv->nr_pages; i++) - __free_page(fw_priv->pages[i]); - kfree(fw_priv->pages); kfree(fw_priv); module_put(THIS_MODULE); @@ -168,7 +317,7 @@ static int firmware_uevent(struct device *dev, struct kobj_uevent_env *env) { struct firmware_priv *fw_priv = to_firmware_priv(dev); - if (add_uevent_var(env, "FIRMWARE=%s", fw_priv->fw_id)) + if (add_uevent_var(env, "FIRMWARE=%s", fw_priv->buf->fw_id)) return -ENOMEM; if (add_uevent_var(env, "TIMEOUT=%i", loading_timeout)) return -ENOMEM; @@ -189,20 +338,16 @@ static ssize_t firmware_loading_show(struct device *dev, struct device_attribute *attr, char *buf) { struct firmware_priv *fw_priv = to_firmware_priv(dev); - int loading = test_bit(FW_STATUS_LOADING, &fw_priv->status); + int loading = test_bit(FW_STATUS_LOADING, &fw_priv->buf->status); return sprintf(buf, "%d\n", loading); } +/* firmware holds the ownership of pages */ static void firmware_free_data(const struct firmware *fw) { - int i; - vunmap(fw->data); - if (fw->pages) { - for (i = 0; i < PFN_UP(fw->size); i++) - __free_page(fw->pages[i]); - kfree(fw->pages); - } + WARN_ON(!fw->priv); + fw_free_buf(fw->priv); } /* Some architectures don't have PAGE_KERNEL_RO */ @@ -227,45 +372,33 @@ static ssize_t firmware_loading_store(struct device *dev, const char *buf, size_t count) { struct firmware_priv *fw_priv = to_firmware_priv(dev); + struct firmware_buf *fw_buf = fw_priv->buf; int loading = simple_strtol(buf, NULL, 10); int i; mutex_lock(&fw_lock); - if (!fw_priv->fw) + if (!fw_buf) goto out; switch (loading) { case 1: - firmware_free_data(fw_priv->fw); - memset(fw_priv->fw, 0, sizeof(struct firmware)); - /* If the pages are not owned by 'struct firmware' */ - for (i = 0; i < fw_priv->nr_pages; i++) - __free_page(fw_priv->pages[i]); - kfree(fw_priv->pages); - fw_priv->pages = NULL; - fw_priv->page_array_size = 0; - fw_priv->nr_pages = 0; - set_bit(FW_STATUS_LOADING, &fw_priv->status); + /* discarding any previous partial load */ + if (!test_bit(FW_STATUS_DONE, &fw_buf->status)) { + for (i = 0; i < fw_buf->nr_pages; i++) + __free_page(fw_buf->pages[i]); + kfree(fw_buf->pages); + fw_buf->pages = NULL; + fw_buf->page_array_size = 0; + fw_buf->nr_pages = 0; + set_bit(FW_STATUS_LOADING, &fw_buf->status); + } break; case 0: - if (test_bit(FW_STATUS_LOADING, &fw_priv->status)) { - vunmap(fw_priv->fw->data); - fw_priv->fw->data = vmap(fw_priv->pages, - fw_priv->nr_pages, - 0, PAGE_KERNEL_RO); - if (!fw_priv->fw->data) { - dev_err(dev, "%s: vmap() failed\n", __func__); - goto err; - } - /* Pages are now owned by 'struct firmware' */ - fw_priv->fw->pages = fw_priv->pages; - fw_priv->pages = NULL; - - fw_priv->page_array_size = 0; - fw_priv->nr_pages = 0; - complete(&fw_priv->completion); - clear_bit(FW_STATUS_LOADING, &fw_priv->status); + if (test_bit(FW_STATUS_LOADING, &fw_buf->status)) { + set_bit(FW_STATUS_DONE, &fw_buf->status); + clear_bit(FW_STATUS_LOADING, &fw_buf->status); + complete_all(&fw_buf->completion); break; } /* fallthrough */ @@ -273,7 +406,6 @@ static ssize_t firmware_loading_store(struct device *dev, dev_err(dev, "%s: unexpected value (%d)\n", __func__, loading); /* fallthrough */ case -1: - err: fw_load_abort(fw_priv); break; } @@ -290,21 +422,21 @@ static ssize_t firmware_data_read(struct file *filp, struct kobject *kobj, { struct device *dev = kobj_to_dev(kobj); struct firmware_priv *fw_priv = to_firmware_priv(dev); - struct firmware *fw; + struct firmware_buf *buf; ssize_t ret_count; mutex_lock(&fw_lock); - fw = fw_priv->fw; - if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) { + buf = fw_priv->buf; + if (!buf || test_bit(FW_STATUS_DONE, &buf->status)) { ret_count = -ENODEV; goto out; } - if (offset > fw->size) { + if (offset > buf->size) { ret_count = 0; goto out; } - if (count > fw->size - offset) - count = fw->size - offset; + if (count > buf->size - offset) + count = buf->size - offset; ret_count = count; @@ -314,11 +446,11 @@ static ssize_t firmware_data_read(struct file *filp, struct kobject *kobj, int page_ofs = offset & (PAGE_SIZE-1); int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count); - page_data = kmap(fw_priv->pages[page_nr]); + page_data = kmap(buf->pages[page_nr]); memcpy(buffer, page_data + page_ofs, page_cnt); - kunmap(fw_priv->pages[page_nr]); + kunmap(buf->pages[page_nr]); buffer += page_cnt; offset += page_cnt; count -= page_cnt; @@ -330,12 +462,13 @@ out: static int fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size) { + struct firmware_buf *buf = fw_priv->buf; int pages_needed = ALIGN(min_size, PAGE_SIZE) >> PAGE_SHIFT; /* If the array of pages is too small, grow it... */ - if (fw_priv->page_array_size < pages_needed) { + if (buf->page_array_size < pages_needed) { int new_array_size = max(pages_needed, - fw_priv->page_array_size * 2); + buf->page_array_size * 2); struct page **new_pages; new_pages = kmalloc(new_array_size * sizeof(void *), @@ -344,24 +477,24 @@ static int fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size) fw_load_abort(fw_priv); return -ENOMEM; } - memcpy(new_pages, fw_priv->pages, - fw_priv->page_array_size * sizeof(void *)); - memset(&new_pages[fw_priv->page_array_size], 0, sizeof(void *) * - (new_array_size - fw_priv->page_array_size)); - kfree(fw_priv->pages); - fw_priv->pages = new_pages; - fw_priv->page_array_size = new_array_size; + memcpy(new_pages, buf->pages, + buf->page_array_size * sizeof(void *)); + memset(&new_pages[buf->page_array_size], 0, sizeof(void *) * + (new_array_size - buf->page_array_size)); + kfree(buf->pages); + buf->pages = new_pages; + buf->page_array_size = new_array_size; } - while (fw_priv->nr_pages < pages_needed) { - fw_priv->pages[fw_priv->nr_pages] = + while (buf->nr_pages < pages_needed) { + buf->pages[buf->nr_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM); - if (!fw_priv->pages[fw_priv->nr_pages]) { + if (!buf->pages[buf->nr_pages]) { fw_load_abort(fw_priv); return -ENOMEM; } - fw_priv->nr_pages++; + buf->nr_pages++; } return 0; } @@ -384,18 +517,19 @@ static ssize_t firmware_data_write(struct file *filp, struct kobject *kobj, { struct device *dev = kobj_to_dev(kobj); struct firmware_priv *fw_priv = to_firmware_priv(dev); - struct firmware *fw; + struct firmware_buf *buf; ssize_t retval; if (!capable(CAP_SYS_RAWIO)) return -EPERM; mutex_lock(&fw_lock); - fw = fw_priv->fw; - if (!fw || test_bit(FW_STATUS_DONE, &fw_priv->status)) { + buf = fw_priv->buf; + if (!buf || test_bit(FW_STATUS_DONE, &buf->status)) { retval = -ENODEV; goto out; } + retval = fw_realloc_buffer(fw_priv, offset + count); if (retval) goto out; @@ -408,17 +542,17 @@ static ssize_t firmware_data_write(struct file *filp, struct kobject *kobj, int page_ofs = offset & (PAGE_SIZE - 1); int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count); - page_data = kmap(fw_priv->pages[page_nr]); + page_data = kmap(buf->pages[page_nr]); memcpy(page_data + page_ofs, buffer, page_cnt); - kunmap(fw_priv->pages[page_nr]); + kunmap(buf->pages[page_nr]); buffer += page_cnt; offset += page_cnt; count -= page_cnt; } - fw->size = max_t(size_t, offset, fw->size); + buf->size = max_t(size_t, offset, buf->size); out: mutex_unlock(&fw_lock); return retval; @@ -445,35 +579,120 @@ fw_create_instance(struct firmware *firmware, const char *fw_name, struct firmware_priv *fw_priv; struct device *f_dev; - fw_priv = kzalloc(sizeof(*fw_priv) + strlen(fw_name) + 1 , GFP_KERNEL); + fw_priv = kzalloc(sizeof(*fw_priv), GFP_KERNEL); if (!fw_priv) { dev_err(device, "%s: kmalloc failed\n", __func__); - return ERR_PTR(-ENOMEM); + fw_priv = ERR_PTR(-ENOMEM); + goto exit; } - fw_priv->fw = firmware; fw_priv->nowait = nowait; - strcpy(fw_priv->fw_id, fw_name); - init_completion(&fw_priv->completion); + fw_priv->fw = firmware; setup_timer(&fw_priv->timeout, firmware_class_timeout, (u_long) fw_priv); f_dev = &fw_priv->dev; device_initialize(f_dev); - dev_set_name(f_dev, "%s", dev_name(device)); + dev_set_name(f_dev, "%s", fw_name); f_dev->parent = device; f_dev->class = &firmware_class; - +exit: return fw_priv; } +/* one pages buffer is mapped/unmapped only once */ +static int fw_map_pages_buf(struct firmware_buf *buf) +{ + buf->data = vmap(buf->pages, buf->nr_pages, 0, PAGE_KERNEL_RO); + if (!buf->data) + return -ENOMEM; + return 0; +} + +/* store the pages buffer info firmware from buf */ +static void fw_set_page_data(struct firmware_buf *buf, struct firmware *fw) +{ + fw->priv = buf; + fw->pages = buf->pages; + fw->size = buf->size; + fw->data = buf->data; + + pr_debug("%s: fw-%s buf=%p data=%p size=%u\n", + __func__, buf->fw_id, buf, buf->data, + (unsigned int)buf->size); +} + +#ifdef CONFIG_PM_SLEEP +static void fw_name_devm_release(struct device *dev, void *res) +{ + struct fw_name_devm *fwn = res; + + if (fwn->magic == (unsigned long)&fw_cache) + pr_debug("%s: fw_name-%s devm-%p released\n", + __func__, fwn->name, res); +} + +static int fw_devm_match(struct device *dev, void *res, + void *match_data) +{ + struct fw_name_devm *fwn = res; + + return (fwn->magic == (unsigned long)&fw_cache) && + !strcmp(fwn->name, match_data); +} + +static struct fw_name_devm *fw_find_devm_name(struct device *dev, + const char *name) +{ + struct fw_name_devm *fwn; + + fwn = devres_find(dev, fw_name_devm_release, + fw_devm_match, (void *)name); + return fwn; +} + +/* add firmware name into devres list */ +static int fw_add_devm_name(struct device *dev, const char *name) +{ + struct fw_name_devm *fwn; + + fwn = fw_find_devm_name(dev, name); + if (fwn) + return 1; + + fwn = devres_alloc(fw_name_devm_release, sizeof(struct fw_name_devm) + + strlen(name) + 1, GFP_KERNEL); + if (!fwn) + return -ENOMEM; + + fwn->magic = (unsigned long)&fw_cache; + strcpy(fwn->name, name); + devres_add(dev, fwn); + + return 0; +} +#else +static int fw_add_devm_name(struct device *dev, const char *name) +{ + return 0; +} +#endif + +static void _request_firmware_cleanup(const struct firmware **firmware_p) +{ + release_firmware(*firmware_p); + *firmware_p = NULL; +} + static struct firmware_priv * _request_firmware_prepare(const struct firmware **firmware_p, const char *name, struct device *device, bool uevent, bool nowait) { struct firmware *firmware; - struct firmware_priv *fw_priv; + struct firmware_priv *fw_priv = NULL; + struct firmware_buf *buf; + int ret; if (!firmware_p) return ERR_PTR(-EINVAL); @@ -490,18 +709,46 @@ _request_firmware_prepare(const struct firmware **firmware_p, const char *name, return NULL; } - fw_priv = fw_create_instance(firmware, name, device, uevent, nowait); - if (IS_ERR(fw_priv)) { - release_firmware(firmware); + ret = fw_lookup_and_allocate_buf(name, &fw_cache, &buf); + if (!ret) + fw_priv = fw_create_instance(firmware, name, device, + uevent, nowait); + + if (IS_ERR(fw_priv) || ret < 0) { + kfree(firmware); *firmware_p = NULL; + return ERR_PTR(-ENOMEM); + } else if (fw_priv) { + fw_priv->buf = buf; + + /* + * bind with 'buf' now to avoid warning in failure path + * of requesting firmware. + */ + firmware->priv = buf; + return fw_priv; } - return fw_priv; -} -static void _request_firmware_cleanup(const struct firmware **firmware_p) -{ - release_firmware(*firmware_p); - *firmware_p = NULL; + /* share the cached buf, which is inprogessing or completed */ + check_status: + mutex_lock(&fw_lock); + if (test_bit(FW_STATUS_ABORT, &buf->status)) { + fw_priv = ERR_PTR(-ENOENT); + firmware->priv = buf; + _request_firmware_cleanup(firmware_p); + goto exit; + } else if (test_bit(FW_STATUS_DONE, &buf->status)) { + fw_priv = NULL; + fw_set_page_data(buf, firmware); + goto exit; + } + mutex_unlock(&fw_lock); + wait_for_completion(&buf->completion); + goto check_status; + +exit: + mutex_unlock(&fw_lock); + return fw_priv; } static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent, @@ -509,6 +756,8 @@ static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent, { int retval = 0; struct device *f_dev = &fw_priv->dev; + struct firmware_buf *buf = fw_priv->buf; + struct firmware_cache *fwc = &fw_cache; dev_set_uevent_suppress(f_dev, true); @@ -535,7 +784,7 @@ static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent, if (uevent) { dev_set_uevent_suppress(f_dev, false); - dev_dbg(f_dev, "firmware: requesting %s\n", fw_priv->fw_id); + dev_dbg(f_dev, "firmware: requesting %s\n", buf->fw_id); if (timeout != MAX_SCHEDULE_TIMEOUT) mod_timer(&fw_priv->timeout, round_jiffies_up(jiffies + timeout)); @@ -543,15 +792,40 @@ static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent, kobject_uevent(&fw_priv->dev.kobj, KOBJ_ADD); } - wait_for_completion(&fw_priv->completion); + wait_for_completion(&buf->completion); - set_bit(FW_STATUS_DONE, &fw_priv->status); del_timer_sync(&fw_priv->timeout); mutex_lock(&fw_lock); - if (!fw_priv->fw->size || test_bit(FW_STATUS_ABORT, &fw_priv->status)) + if (!buf->size || test_bit(FW_STATUS_ABORT, &buf->status)) retval = -ENOENT; - fw_priv->fw = NULL; + + /* + * add firmware name into devres list so that we can auto cache + * and uncache firmware for device. + * + * f_dev->parent may has been deleted already, but the problem + * should be fixed in devres or driver core. + */ + if (!retval && f_dev->parent) + fw_add_devm_name(f_dev->parent, buf->fw_id); + + if (!retval) + retval = fw_map_pages_buf(buf); + + /* + * After caching firmware image is started, let it piggyback + * on request firmware. + */ + if (!retval && fwc->state == FW_LOADER_START_CACHE) { + if (fw_cache_piggyback_on_request(buf->fw_id)) + kref_get(&buf->ref); + } + + /* pass the pages buffer to driver at the last minute */ + fw_set_page_data(buf, fw_priv->fw); + + fw_priv->buf = NULL; mutex_unlock(&fw_lock); device_remove_file(f_dev, &dev_attr_loading); @@ -578,6 +852,8 @@ err_put_dev: * @name will be used as $FIRMWARE in the uevent environment and * should be distinctive enough not to be confused with any other * firmware image for this or any other device. + * + * Caller must hold the reference count of @device. **/ int request_firmware(const struct firmware **firmware_p, const char *name, @@ -659,6 +935,7 @@ static void request_firmware_work_func(struct work_struct *work) out: fw_work->cont(fw, fw_work->context); + put_device(fw_work->device); module_put(fw_work->module); kfree(fw_work); @@ -677,9 +954,15 @@ static void request_firmware_work_func(struct work_struct *work) * @cont: function will be called asynchronously when the firmware * request is over. * - * Asynchronous variant of request_firmware() for user contexts where - * it is not possible to sleep for long time. It can't be called - * in atomic contexts. + * Caller must hold the reference count of @device. + * + * Asynchronous variant of request_firmware() for user contexts: + * - sleep for as small periods as possible since it may + * increase kernel boot time of built-in device drivers + * requesting firmware in their ->probe() methods, if + * @gfp is GFP_KERNEL. + * + * - can't sleep at all if @gfp is GFP_ATOMIC. **/ int request_firmware_nowait( @@ -705,18 +988,363 @@ request_firmware_nowait( return -EFAULT; } + get_device(fw_work->device); INIT_WORK(&fw_work->work, request_firmware_work_func); schedule_work(&fw_work->work); return 0; } +/** + * cache_firmware - cache one firmware image in kernel memory space + * @fw_name: the firmware image name + * + * Cache firmware in kernel memory so that drivers can use it when + * system isn't ready for them to request firmware image from userspace. + * Once it returns successfully, driver can use request_firmware or its + * nowait version to get the cached firmware without any interacting + * with userspace + * + * Return 0 if the firmware image has been cached successfully + * Return !0 otherwise + * + */ +int cache_firmware(const char *fw_name) +{ + int ret; + const struct firmware *fw; + + pr_debug("%s: %s\n", __func__, fw_name); + + ret = request_firmware(&fw, fw_name, NULL); + if (!ret) + kfree(fw); + + pr_debug("%s: %s ret=%d\n", __func__, fw_name, ret); + + return ret; +} + +/** + * uncache_firmware - remove one cached firmware image + * @fw_name: the firmware image name + * + * Uncache one firmware image which has been cached successfully + * before. + * + * Return 0 if the firmware cache has been removed successfully + * Return !0 otherwise + * + */ +int uncache_firmware(const char *fw_name) +{ + struct firmware_buf *buf; + struct firmware fw; + + pr_debug("%s: %s\n", __func__, fw_name); + + if (fw_get_builtin_firmware(&fw, fw_name)) + return 0; + + buf = fw_lookup_buf(fw_name); + if (buf) { + fw_free_buf(buf); + return 0; + } + + return -EINVAL; +} + +#ifdef CONFIG_PM_SLEEP +static struct fw_cache_entry *alloc_fw_cache_entry(const char *name) +{ + struct fw_cache_entry *fce; + + fce = kzalloc(sizeof(*fce) + strlen(name) + 1, GFP_ATOMIC); + if (!fce) + goto exit; + + strcpy(fce->name, name); +exit: + return fce; +} + +static int fw_cache_piggyback_on_request(const char *name) +{ + struct firmware_cache *fwc = &fw_cache; + struct fw_cache_entry *fce; + int ret = 0; + + spin_lock(&fwc->name_lock); + list_for_each_entry(fce, &fwc->fw_names, list) { + if (!strcmp(fce->name, name)) + goto found; + } + + fce = alloc_fw_cache_entry(name); + if (fce) { + ret = 1; + list_add(&fce->list, &fwc->fw_names); + pr_debug("%s: fw: %s\n", __func__, name); + } +found: + spin_unlock(&fwc->name_lock); + return ret; +} + +static void free_fw_cache_entry(struct fw_cache_entry *fce) +{ + kfree(fce); +} + +static void __async_dev_cache_fw_image(void *fw_entry, + async_cookie_t cookie) +{ + struct fw_cache_entry *fce = fw_entry; + struct firmware_cache *fwc = &fw_cache; + int ret; + + ret = cache_firmware(fce->name); + if (ret) { + spin_lock(&fwc->name_lock); + list_del(&fce->list); + spin_unlock(&fwc->name_lock); + + free_fw_cache_entry(fce); + } + + spin_lock(&fwc->name_lock); + fwc->cnt--; + spin_unlock(&fwc->name_lock); + + wake_up(&fwc->wait_queue); +} + +/* called with dev->devres_lock held */ +static void dev_create_fw_entry(struct device *dev, void *res, + void *data) +{ + struct fw_name_devm *fwn = res; + const char *fw_name = fwn->name; + struct list_head *head = data; + struct fw_cache_entry *fce; + + fce = alloc_fw_cache_entry(fw_name); + if (fce) + list_add(&fce->list, head); +} + +static int devm_name_match(struct device *dev, void *res, + void *match_data) +{ + struct fw_name_devm *fwn = res; + return (fwn->magic == (unsigned long)match_data); +} + +static void dev_cache_fw_image(struct device *dev, void *data) +{ + LIST_HEAD(todo); + struct fw_cache_entry *fce; + struct fw_cache_entry *fce_next; + struct firmware_cache *fwc = &fw_cache; + + devres_for_each_res(dev, fw_name_devm_release, + devm_name_match, &fw_cache, + dev_create_fw_entry, &todo); + + list_for_each_entry_safe(fce, fce_next, &todo, list) { + list_del(&fce->list); + + spin_lock(&fwc->name_lock); + fwc->cnt++; + list_add(&fce->list, &fwc->fw_names); + spin_unlock(&fwc->name_lock); + + async_schedule(__async_dev_cache_fw_image, (void *)fce); + } +} + +static void __device_uncache_fw_images(void) +{ + struct firmware_cache *fwc = &fw_cache; + struct fw_cache_entry *fce; + + spin_lock(&fwc->name_lock); + while (!list_empty(&fwc->fw_names)) { + fce = list_entry(fwc->fw_names.next, + struct fw_cache_entry, list); + list_del(&fce->list); + spin_unlock(&fwc->name_lock); + + uncache_firmware(fce->name); + free_fw_cache_entry(fce); + + spin_lock(&fwc->name_lock); + } + spin_unlock(&fwc->name_lock); +} + +/** + * device_cache_fw_images - cache devices' firmware + * + * If one device called request_firmware or its nowait version + * successfully before, the firmware names are recored into the + * device's devres link list, so device_cache_fw_images can call + * cache_firmware() to cache these firmwares for the device, + * then the device driver can load its firmwares easily at + * time when system is not ready to complete loading firmware. + */ +static void device_cache_fw_images(void) +{ + struct firmware_cache *fwc = &fw_cache; + int old_timeout; + DEFINE_WAIT(wait); + + pr_debug("%s\n", __func__); + + /* + * use small loading timeout for caching devices' firmware + * because all these firmware images have been loaded + * successfully at lease once, also system is ready for + * completing firmware loading now. The maximum size of + * firmware in current distributions is about 2M bytes, + * so 10 secs should be enough. + */ + old_timeout = loading_timeout; + loading_timeout = 10; + + mutex_lock(&fw_lock); + fwc->state = FW_LOADER_START_CACHE; + dpm_for_each_dev(NULL, dev_cache_fw_image); + mutex_unlock(&fw_lock); + + /* wait for completion of caching firmware for all devices */ + spin_lock(&fwc->name_lock); + for (;;) { + prepare_to_wait(&fwc->wait_queue, &wait, + TASK_UNINTERRUPTIBLE); + if (!fwc->cnt) + break; + + spin_unlock(&fwc->name_lock); + + schedule(); + + spin_lock(&fwc->name_lock); + } + spin_unlock(&fwc->name_lock); + finish_wait(&fwc->wait_queue, &wait); + + loading_timeout = old_timeout; +} + +/** + * device_uncache_fw_images - uncache devices' firmware + * + * uncache all firmwares which have been cached successfully + * by device_uncache_fw_images earlier + */ +static void device_uncache_fw_images(void) +{ + pr_debug("%s\n", __func__); + __device_uncache_fw_images(); +} + +static void device_uncache_fw_images_work(struct work_struct *work) +{ + device_uncache_fw_images(); +} + +/** + * device_uncache_fw_images_delay - uncache devices firmwares + * @delay: number of milliseconds to delay uncache device firmwares + * + * uncache all devices's firmwares which has been cached successfully + * by device_cache_fw_images after @delay milliseconds. + */ +static void device_uncache_fw_images_delay(unsigned long delay) +{ + schedule_delayed_work(&fw_cache.work, + msecs_to_jiffies(delay)); +} + +static int fw_pm_notify(struct notifier_block *notify_block, + unsigned long mode, void *unused) +{ + switch (mode) { + case PM_HIBERNATION_PREPARE: + case PM_SUSPEND_PREPARE: + device_cache_fw_images(); + break; + + case PM_POST_SUSPEND: + case PM_POST_HIBERNATION: + case PM_POST_RESTORE: + /* + * In case that system sleep failed and syscore_suspend is + * not called. + */ + mutex_lock(&fw_lock); + fw_cache.state = FW_LOADER_NO_CACHE; + mutex_unlock(&fw_lock); + + device_uncache_fw_images_delay(10 * MSEC_PER_SEC); + break; + } + + return 0; +} + +/* stop caching firmware once syscore_suspend is reached */ +static int fw_suspend(void) +{ + fw_cache.state = FW_LOADER_NO_CACHE; + return 0; +} + +static struct syscore_ops fw_syscore_ops = { + .suspend = fw_suspend, +}; +#else +static int fw_cache_piggyback_on_request(const char *name) +{ + return 0; +} +#endif + +static void __init fw_cache_init(void) +{ + spin_lock_init(&fw_cache.lock); + INIT_LIST_HEAD(&fw_cache.head); + fw_cache.state = FW_LOADER_NO_CACHE; + +#ifdef CONFIG_PM_SLEEP + spin_lock_init(&fw_cache.name_lock); + INIT_LIST_HEAD(&fw_cache.fw_names); + fw_cache.cnt = 0; + + init_waitqueue_head(&fw_cache.wait_queue); + INIT_DELAYED_WORK(&fw_cache.work, + device_uncache_fw_images_work); + + fw_cache.pm_notify.notifier_call = fw_pm_notify; + register_pm_notifier(&fw_cache.pm_notify); + + register_syscore_ops(&fw_syscore_ops); +#endif +} + static int __init firmware_class_init(void) { + fw_cache_init(); return class_register(&firmware_class); } static void __exit firmware_class_exit(void) { +#ifdef CONFIG_PM_SLEEP + unregister_syscore_ops(&fw_syscore_ops); + unregister_pm_notifier(&fw_cache.pm_notify); +#endif class_unregister(&firmware_class); } @@ -726,3 +1354,5 @@ module_exit(firmware_class_exit); EXPORT_SYMBOL(release_firmware); EXPORT_SYMBOL(request_firmware); EXPORT_SYMBOL(request_firmware_nowait); +EXPORT_SYMBOL_GPL(cache_firmware); +EXPORT_SYMBOL_GPL(uncache_firmware); diff --git a/drivers/base/platform.c b/drivers/base/platform.c index a1a722502587..ddeca142293c 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -20,9 +20,13 @@ #include <linux/err.h> #include <linux/slab.h> #include <linux/pm_runtime.h> +#include <linux/idr.h> #include "base.h" +/* For automatically allocated device IDs */ +static DEFINE_IDA(platform_devid_ida); + #define to_platform_driver(drv) (container_of((drv), struct platform_driver, \ driver)) @@ -99,6 +103,9 @@ struct resource *platform_get_resource_byname(struct platform_device *dev, for (i = 0; i < dev->num_resources; i++) { struct resource *r = &dev->resource[i]; + if (unlikely(!r->name)) + continue; + if (type == resource_type(r) && !strcmp(r->name, name)) return r; } @@ -263,7 +270,7 @@ EXPORT_SYMBOL_GPL(platform_device_add_data); */ int platform_device_add(struct platform_device *pdev) { - int i, ret = 0; + int i, ret; if (!pdev) return -EINVAL; @@ -273,10 +280,27 @@ int platform_device_add(struct platform_device *pdev) pdev->dev.bus = &platform_bus_type; - if (pdev->id != -1) + switch (pdev->id) { + default: dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id); - else + break; + case PLATFORM_DEVID_NONE: dev_set_name(&pdev->dev, "%s", pdev->name); + break; + case PLATFORM_DEVID_AUTO: + /* + * Automatically allocated device ID. We mark it as such so + * that we remember it must be freed, and we append a suffix + * to avoid namespace collision with explicit IDs. + */ + ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL); + if (ret < 0) + goto err_out; + pdev->id = ret; + pdev->id_auto = true; + dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id); + break; + } for (i = 0; i < pdev->num_resources; i++) { struct resource *p, *r = &pdev->resource[i]; @@ -309,6 +333,11 @@ int platform_device_add(struct platform_device *pdev) return ret; failed: + if (pdev->id_auto) { + ida_simple_remove(&platform_devid_ida, pdev->id); + pdev->id = PLATFORM_DEVID_AUTO; + } + while (--i >= 0) { struct resource *r = &pdev->resource[i]; unsigned long type = resource_type(r); @@ -317,6 +346,7 @@ int platform_device_add(struct platform_device *pdev) release_resource(r); } + err_out: return ret; } EXPORT_SYMBOL_GPL(platform_device_add); @@ -336,6 +366,11 @@ void platform_device_del(struct platform_device *pdev) if (pdev) { device_del(&pdev->dev); + if (pdev->id_auto) { + ida_simple_remove(&platform_devid_ida, pdev->id); + pdev->id = PLATFORM_DEVID_AUTO; + } + for (i = 0; i < pdev->num_resources; i++) { struct resource *r = &pdev->resource[i]; unsigned long type = resource_type(r); diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 0113adc310dc..b0b072a88f5f 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -1324,3 +1324,25 @@ int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) return async_error; } EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); + +/** + * dpm_for_each_dev - device iterator. + * @data: data for the callback. + * @fn: function to be called for each device. + * + * Iterate over devices in dpm_list, and call @fn for each device, + * passing it @data. + */ +void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)) +{ + struct device *dev; + + if (!fn) + return; + + device_pm_lock(); + list_for_each_entry(dev, &dpm_list, power.entry) + fn(dev, data); + device_pm_unlock(); +} +EXPORT_SYMBOL_GPL(dpm_for_each_dev); |