diff options
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/base.h | 1 | ||||
| -rw-r--r-- | drivers/base/bus.c | 31 | ||||
| -rw-r--r-- | drivers/base/cacheinfo.c | 4 | ||||
| -rw-r--r-- | drivers/base/cpu.c | 29 | ||||
| -rw-r--r-- | drivers/base/dd.c | 163 | ||||
| -rw-r--r-- | drivers/base/firmware_class.c | 63 | ||||
| -rw-r--r-- | drivers/base/platform.c | 13 |
7 files changed, 258 insertions, 46 deletions
diff --git a/drivers/base/base.h b/drivers/base/base.h index 251c5d30f963..fd3347d9f153 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -116,6 +116,7 @@ static inline int driver_match_device(struct device_driver *drv, { return drv->bus->match ? drv->bus->match(dev, drv) : 1; } +extern bool driver_allows_async_probing(struct device_driver *drv); extern int driver_add_groups(struct device_driver *drv, const struct attribute_group **groups); diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 79bc203f51ef..500592486e88 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -10,6 +10,7 @@ * */ +#include <linux/async.h> #include <linux/device.h> #include <linux/module.h> #include <linux/errno.h> @@ -549,15 +550,12 @@ void bus_probe_device(struct device *dev) { struct bus_type *bus = dev->bus; struct subsys_interface *sif; - int ret; if (!bus) return; - if (bus->p->drivers_autoprobe) { - ret = device_attach(dev); - WARN_ON(ret < 0); - } + if (bus->p->drivers_autoprobe) + device_initial_probe(dev); mutex_lock(&bus->p->mutex); list_for_each_entry(sif, &bus->p->interfaces, node) @@ -659,6 +657,17 @@ static ssize_t uevent_store(struct device_driver *drv, const char *buf, } static DRIVER_ATTR_WO(uevent); +static void driver_attach_async(void *_drv, async_cookie_t cookie) +{ + struct device_driver *drv = _drv; + int ret; + + ret = driver_attach(drv); + + pr_debug("bus: '%s': driver %s async attach completed: %d\n", + drv->bus->name, drv->name, ret); +} + /** * bus_add_driver - Add a driver to the bus. * @drv: driver. @@ -691,9 +700,15 @@ int bus_add_driver(struct device_driver *drv) klist_add_tail(&priv->knode_bus, &bus->p->klist_drivers); if (drv->bus->p->drivers_autoprobe) { - error = driver_attach(drv); - if (error) - goto out_unregister; + if (driver_allows_async_probing(drv)) { + pr_debug("bus: '%s': probing driver %s asynchronously\n", + drv->bus->name, drv->name); + async_schedule(driver_attach_async, drv); + } else { + error = driver_attach(drv); + if (error) + goto out_unregister; + } } module_add_driver(drv->owner, drv); diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c index df0c66cb7ad3..764280a91776 100644 --- a/drivers/base/cacheinfo.c +++ b/drivers/base/cacheinfo.c @@ -191,12 +191,12 @@ static int detect_cache_attributes(unsigned int cpu) if (ret) goto free_ci; /* - * For systems using DT for cache hierarcy, of_node and shared_cpu_map + * For systems using DT for cache hierarchy, of_node and shared_cpu_map * will be set up here only if they are not populated already */ ret = cache_shared_cpu_map_setup(cpu); if (ret) { - pr_warn("Unable to detect cache hierarcy from DT for CPU %d\n", + pr_warn("Unable to detect cache hierarchy from DT for CPU %d\n", cpu); goto free_ci; } diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c index f160ea44a86d..78720e706176 100644 --- a/drivers/base/cpu.c +++ b/drivers/base/cpu.c @@ -16,6 +16,7 @@ #include <linux/acpi.h> #include <linux/of.h> #include <linux/cpufeature.h> +#include <linux/tick.h> #include "base.h" @@ -265,6 +266,30 @@ static ssize_t print_cpus_offline(struct device *dev, } static DEVICE_ATTR(offline, 0444, print_cpus_offline, NULL); +static ssize_t print_cpus_isolated(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int n = 0, len = PAGE_SIZE-2; + + n = scnprintf(buf, len, "%*pbl\n", cpumask_pr_args(cpu_isolated_map)); + + return n; +} +static DEVICE_ATTR(isolated, 0444, print_cpus_isolated, NULL); + +#ifdef CONFIG_NO_HZ_FULL +static ssize_t print_cpus_nohz_full(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int n = 0, len = PAGE_SIZE-2; + + n = scnprintf(buf, len, "%*pbl\n", cpumask_pr_args(tick_nohz_full_mask)); + + return n; +} +static DEVICE_ATTR(nohz_full, 0444, print_cpus_nohz_full, NULL); +#endif + static void cpu_device_release(struct device *dev) { /* @@ -431,6 +456,10 @@ static struct attribute *cpu_root_attrs[] = { &cpu_attrs[2].attr.attr, &dev_attr_kernel_max.attr, &dev_attr_offline.attr, + &dev_attr_isolated.attr, +#ifdef CONFIG_NO_HZ_FULL + &dev_attr_nohz_full.attr, +#endif #ifdef CONFIG_GENERIC_CPU_AUTOPROBE &dev_attr_modalias.attr, #endif diff --git a/drivers/base/dd.c b/drivers/base/dd.c index e843fdbe4925..a638bbb1a27a 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -141,7 +141,7 @@ static bool driver_deferred_probe_enable = false; * more than one device is probing at the same time, it is possible for one * probe to complete successfully while another is about to defer. If the second * depends on the first, then it will get put on the pending list after the - * trigger event has already occured and will be stuck there. + * trigger event has already occurred and will be stuck there. * * The atomic 'deferred_trigger_count' is used to determine if a successful * trigger has occurred in the midst of probing a driver. If the trigger count @@ -417,31 +417,107 @@ int driver_probe_device(struct device_driver *drv, struct device *dev) return ret; } -static int __device_attach(struct device_driver *drv, void *data) +bool driver_allows_async_probing(struct device_driver *drv) { - struct device *dev = data; + switch (drv->probe_type) { + case PROBE_PREFER_ASYNCHRONOUS: + return true; + + case PROBE_FORCE_SYNCHRONOUS: + return false; + + default: + if (module_requested_async_probing(drv->owner)) + return true; + + return false; + } +} + +struct device_attach_data { + struct device *dev; + + /* + * Indicates whether we are are considering asynchronous probing or + * not. Only initial binding after device or driver registration + * (including deferral processing) may be done asynchronously, the + * rest is always synchronous, as we expect it is being done by + * request from userspace. + */ + bool check_async; + + /* + * Indicates if we are binding synchronous or asynchronous drivers. + * When asynchronous probing is enabled we'll execute 2 passes + * over drivers: first pass doing synchronous probing and second + * doing asynchronous probing (if synchronous did not succeed - + * most likely because there was no driver requiring synchronous + * probing - and we found asynchronous driver during first pass). + * The 2 passes are done because we can't shoot asynchronous + * probe for given device and driver from bus_for_each_drv() since + * driver pointer is not guaranteed to stay valid once + * bus_for_each_drv() iterates to the next driver on the bus. + */ + bool want_async; + + /* + * We'll set have_async to 'true' if, while scanning for matching + * driver, we'll encounter one that requests asynchronous probing. + */ + bool have_async; +}; + +static int __device_attach_driver(struct device_driver *drv, void *_data) +{ + struct device_attach_data *data = _data; + struct device *dev = data->dev; + bool async_allowed; + + /* + * Check if device has already been claimed. This may + * happen with driver loading, device discovery/registration, + * and deferred probe processing happens all at once with + * multiple threads. + */ + if (dev->driver) + return -EBUSY; if (!driver_match_device(drv, dev)) return 0; + async_allowed = driver_allows_async_probing(drv); + + if (async_allowed) + data->have_async = true; + + if (data->check_async && async_allowed != data->want_async) + return 0; + return driver_probe_device(drv, dev); } -/** - * device_attach - try to attach device to a driver. - * @dev: device. - * - * Walk the list of drivers that the bus has and call - * driver_probe_device() for each pair. If a compatible - * pair is found, break out and return. - * - * Returns 1 if the device was bound to a driver; - * 0 if no matching driver was found; - * -ENODEV if the device is not registered. - * - * When called for a USB interface, @dev->parent lock must be held. - */ -int device_attach(struct device *dev) +static void __device_attach_async_helper(void *_dev, async_cookie_t cookie) +{ + struct device *dev = _dev; + struct device_attach_data data = { + .dev = dev, + .check_async = true, + .want_async = true, + }; + + device_lock(dev); + + bus_for_each_drv(dev->bus, NULL, &data, __device_attach_driver); + dev_dbg(dev, "async probe completed\n"); + + pm_request_idle(dev); + + device_unlock(dev); + + put_device(dev); +} + +static int __device_attach(struct device *dev, bool allow_async) { int ret = 0; @@ -459,15 +535,59 @@ int device_attach(struct device *dev) ret = 0; } } else { - ret = bus_for_each_drv(dev->bus, NULL, dev, __device_attach); - pm_request_idle(dev); + struct device_attach_data data = { + .dev = dev, + .check_async = allow_async, + .want_async = false, + }; + + ret = bus_for_each_drv(dev->bus, NULL, &data, + __device_attach_driver); + if (!ret && allow_async && data.have_async) { + /* + * If we could not find appropriate driver + * synchronously and we are allowed to do + * async probes and there are drivers that + * want to probe asynchronously, we'll + * try them. + */ + dev_dbg(dev, "scheduling asynchronous probe\n"); + get_device(dev); + async_schedule(__device_attach_async_helper, dev); + } else { + pm_request_idle(dev); + } } out_unlock: device_unlock(dev); return ret; } + +/** + * device_attach - try to attach device to a driver. + * @dev: device. + * + * Walk the list of drivers that the bus has and call + * driver_probe_device() for each pair. If a compatible + * pair is found, break out and return. + * + * Returns 1 if the device was bound to a driver; + * 0 if no matching driver was found; + * -ENODEV if the device is not registered. + * + * When called for a USB interface, @dev->parent lock must be held. + */ +int device_attach(struct device *dev) +{ + return __device_attach(dev, false); +} EXPORT_SYMBOL_GPL(device_attach); +void device_initial_probe(struct device *dev) +{ + __device_attach(dev, true); +} + static int __driver_attach(struct device *dev, void *data) { struct device_driver *drv = data; @@ -522,6 +642,9 @@ static void __device_release_driver(struct device *dev) drv = dev->driver; if (drv) { + if (driver_allows_async_probing(drv)) + async_synchronize_full(); + pm_runtime_get_sync(dev); driver_sysfs_remove(dev); diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index 171841ad1008..9c4288362a8e 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -150,17 +150,17 @@ struct firmware_buf { int page_array_size; struct list_head pending_list; #endif - char fw_id[]; + const char *fw_id; }; struct fw_cache_entry { struct list_head list; - char name[]; + const char *name; }; struct fw_name_devm { unsigned long magic; - char name[]; + const char *name; }; #define to_fwbuf(d) container_of(d, struct firmware_buf, ref) @@ -181,13 +181,17 @@ static struct firmware_buf *__allocate_fw_buf(const char *fw_name, { struct firmware_buf *buf; - buf = kzalloc(sizeof(*buf) + strlen(fw_name) + 1, GFP_ATOMIC); - + buf = kzalloc(sizeof(*buf), GFP_ATOMIC); if (!buf) - return buf; + return NULL; + + buf->fw_id = kstrdup_const(fw_name, GFP_ATOMIC); + if (!buf->fw_id) { + kfree(buf); + return NULL; + } kref_init(&buf->ref); - strcpy(buf->fw_id, fw_name); buf->fwc = fwc; init_completion(&buf->completion); #ifdef CONFIG_FW_LOADER_USER_HELPER @@ -257,6 +261,7 @@ static void __fw_free_buf(struct kref *ref) } else #endif vfree(buf->data); + kfree_const(buf->fw_id); kfree(buf); } @@ -320,9 +325,13 @@ fail: static int fw_get_filesystem_firmware(struct device *device, struct firmware_buf *buf) { - int i; + int i, len; int rc = -ENOENT; - char *path = __getname(); + char *path; + + path = __getname(); + if (!path) + return -ENOMEM; for (i = 0; i < ARRAY_SIZE(fw_path); i++) { struct file *file; @@ -331,7 +340,12 @@ static int fw_get_filesystem_firmware(struct device *device, if (!fw_path[i][0]) continue; - snprintf(path, PATH_MAX, "%s/%s", fw_path[i], buf->fw_id); + len = snprintf(path, PATH_MAX, "%s/%s", + fw_path[i], buf->fw_id); + if (len >= PATH_MAX) { + rc = -ENAMETOOLONG; + break; + } file = filp_open(path, O_RDONLY, 0); if (IS_ERR(file)) @@ -392,6 +406,7 @@ static void fw_name_devm_release(struct device *dev, void *res) if (fwn->magic == (unsigned long)&fw_cache) pr_debug("%s: fw_name-%s devm-%p released\n", __func__, fwn->name, res); + kfree_const(fwn->name); } static int fw_devm_match(struct device *dev, void *res, @@ -422,13 +437,17 @@ static int fw_add_devm_name(struct device *dev, const char *name) if (fwn) return 1; - fwn = devres_alloc(fw_name_devm_release, sizeof(struct fw_name_devm) + - strlen(name) + 1, GFP_KERNEL); + fwn = devres_alloc(fw_name_devm_release, sizeof(struct fw_name_devm), + GFP_KERNEL); if (!fwn) return -ENOMEM; + fwn->name = kstrdup_const(name, GFP_KERNEL); + if (!fwn->name) { + kfree(fwn); + return -ENOMEM; + } fwn->magic = (unsigned long)&fw_cache; - strcpy(fwn->name, name); devres_add(dev, fwn); return 0; @@ -1247,6 +1266,7 @@ static void request_firmware_work_func(struct work_struct *work) put_device(fw_work->device); /* taken in request_firmware_nowait() */ module_put(fw_work->module); + kfree_const(fw_work->name); kfree(fw_work); } @@ -1286,7 +1306,11 @@ request_firmware_nowait( return -ENOMEM; fw_work->module = module; - fw_work->name = name; + fw_work->name = kstrdup_const(name, gfp); + if (!fw_work->name) { + kfree(fw_work); + return -ENOMEM; + } fw_work->device = device; fw_work->context = context; fw_work->cont = cont; @@ -1294,6 +1318,7 @@ request_firmware_nowait( (uevent ? FW_OPT_UEVENT : FW_OPT_USERHELPER); if (!try_module_get(module)) { + kfree_const(fw_work->name); kfree(fw_work); return -EFAULT; } @@ -1384,11 +1409,16 @@ 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); + fce = kzalloc(sizeof(*fce), GFP_ATOMIC); if (!fce) goto exit; - strcpy(fce->name, name); + fce->name = kstrdup_const(name, GFP_ATOMIC); + if (!fce->name) { + kfree(fce); + fce = NULL; + goto exit; + } exit: return fce; } @@ -1428,6 +1458,7 @@ found: static void free_fw_cache_entry(struct fw_cache_entry *fce) { + kfree_const(fce->name); kfree(fce); } diff --git a/drivers/base/platform.c b/drivers/base/platform.c index ebf034b97278..063f0ab15259 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -613,6 +613,19 @@ int __init_or_module __platform_driver_probe(struct platform_driver *drv, { int retval, code; + if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) { + pr_err("%s: drivers registered with %s can not be probed asynchronously\n", + drv->driver.name, __func__); + return -EINVAL; + } + + /* + * We have to run our probes synchronously because we check if + * we find any devices to bind to and exit with error if there + * are any. + */ + drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS; + /* * Prevent driver from requesting probe deferral to avoid further * futile probe attempts. |