diff options
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/dma-buf.c | 165 | ||||
| -rw-r--r-- | drivers/base/firmware_class.c | 208 | ||||
| -rw-r--r-- | drivers/base/power/runtime.c | 3 | ||||
| -rw-r--r-- | drivers/base/regmap/regcache-rbtree.c | 2 | ||||
| -rw-r--r-- | drivers/base/regmap/regmap-debugfs.c | 12 |
5 files changed, 255 insertions, 135 deletions
diff --git a/drivers/base/dma-buf.c b/drivers/base/dma-buf.c index e38ad243b4bb..07cbbc6fddb4 100644 --- a/drivers/base/dma-buf.c +++ b/drivers/base/dma-buf.c @@ -71,7 +71,7 @@ static inline int is_dma_buf_file(struct file *file) * ops, or error in allocating struct dma_buf, will return negative error. * */ -struct dma_buf *dma_buf_export(void *priv, struct dma_buf_ops *ops, +struct dma_buf *dma_buf_export(void *priv, const struct dma_buf_ops *ops, size_t size, int flags) { struct dma_buf *dmabuf; @@ -80,7 +80,9 @@ struct dma_buf *dma_buf_export(void *priv, struct dma_buf_ops *ops, if (WARN_ON(!priv || !ops || !ops->map_dma_buf || !ops->unmap_dma_buf - || !ops->release)) { + || !ops->release + || !ops->kmap_atomic + || !ops->kmap)) { return ERR_PTR(-EINVAL); } @@ -107,17 +109,18 @@ EXPORT_SYMBOL_GPL(dma_buf_export); /** * dma_buf_fd - returns a file descriptor for the given dma_buf * @dmabuf: [in] pointer to dma_buf for which fd is required. + * @flags: [in] flags to give to fd * * On success, returns an associated 'fd'. Else, returns error. */ -int dma_buf_fd(struct dma_buf *dmabuf) +int dma_buf_fd(struct dma_buf *dmabuf, int flags) { int error, fd; if (!dmabuf || !dmabuf->file) return -EINVAL; - error = get_unused_fd(); + error = get_unused_fd_flags(flags); if (error < 0) return error; fd = error; @@ -185,17 +188,18 @@ struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach; int ret; - if (WARN_ON(!dmabuf || !dev || !dmabuf->ops)) + if (WARN_ON(!dmabuf || !dev)) return ERR_PTR(-EINVAL); attach = kzalloc(sizeof(struct dma_buf_attachment), GFP_KERNEL); if (attach == NULL) - goto err_alloc; - - mutex_lock(&dmabuf->lock); + return ERR_PTR(-ENOMEM); attach->dev = dev; attach->dmabuf = dmabuf; + + mutex_lock(&dmabuf->lock); + if (dmabuf->ops->attach) { ret = dmabuf->ops->attach(dmabuf, dev, attach); if (ret) @@ -206,8 +210,6 @@ struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, mutex_unlock(&dmabuf->lock); return attach; -err_alloc: - return ERR_PTR(-ENOMEM); err_attach: kfree(attach); mutex_unlock(&dmabuf->lock); @@ -224,7 +226,7 @@ EXPORT_SYMBOL_GPL(dma_buf_attach); */ void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach) { - if (WARN_ON(!dmabuf || !attach || !dmabuf->ops)) + if (WARN_ON(!dmabuf || !attach)) return; mutex_lock(&dmabuf->lock); @@ -255,13 +257,10 @@ struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach, might_sleep(); - if (WARN_ON(!attach || !attach->dmabuf || !attach->dmabuf->ops)) + if (WARN_ON(!attach || !attach->dmabuf)) return ERR_PTR(-EINVAL); - mutex_lock(&attach->dmabuf->lock); - if (attach->dmabuf->ops->map_dma_buf) - sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction); - mutex_unlock(&attach->dmabuf->lock); + sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction); return sg_table; } @@ -273,19 +272,137 @@ EXPORT_SYMBOL_GPL(dma_buf_map_attachment); * dma_buf_ops. * @attach: [in] attachment to unmap buffer from * @sg_table: [in] scatterlist info of the buffer to unmap + * @direction: [in] direction of DMA transfer * */ void dma_buf_unmap_attachment(struct dma_buf_attachment *attach, - struct sg_table *sg_table) + struct sg_table *sg_table, + enum dma_data_direction direction) { - if (WARN_ON(!attach || !attach->dmabuf || !sg_table - || !attach->dmabuf->ops)) + if (WARN_ON(!attach || !attach->dmabuf || !sg_table)) return; - mutex_lock(&attach->dmabuf->lock); - if (attach->dmabuf->ops->unmap_dma_buf) - attach->dmabuf->ops->unmap_dma_buf(attach, sg_table); - mutex_unlock(&attach->dmabuf->lock); - + attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, + direction); } EXPORT_SYMBOL_GPL(dma_buf_unmap_attachment); + + +/** + * dma_buf_begin_cpu_access - Must be called before accessing a dma_buf from the + * cpu in the kernel context. Calls begin_cpu_access to allow exporter-specific + * preparations. Coherency is only guaranteed in the specified range for the + * specified access direction. + * @dma_buf: [in] buffer to prepare cpu access for. + * @start: [in] start of range for cpu access. + * @len: [in] length of range for cpu access. + * @direction: [in] length of range for cpu access. + * + * Can return negative error values, returns 0 on success. + */ +int dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len, + enum dma_data_direction direction) +{ + int ret = 0; + + if (WARN_ON(!dmabuf)) + return -EINVAL; + + if (dmabuf->ops->begin_cpu_access) + ret = dmabuf->ops->begin_cpu_access(dmabuf, start, len, direction); + + return ret; +} +EXPORT_SYMBOL_GPL(dma_buf_begin_cpu_access); + +/** + * dma_buf_end_cpu_access - Must be called after accessing a dma_buf from the + * cpu in the kernel context. Calls end_cpu_access to allow exporter-specific + * actions. Coherency is only guaranteed in the specified range for the + * specified access direction. + * @dma_buf: [in] buffer to complete cpu access for. + * @start: [in] start of range for cpu access. + * @len: [in] length of range for cpu access. + * @direction: [in] length of range for cpu access. + * + * This call must always succeed. + */ +void dma_buf_end_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len, + enum dma_data_direction direction) +{ + WARN_ON(!dmabuf); + + if (dmabuf->ops->end_cpu_access) + dmabuf->ops->end_cpu_access(dmabuf, start, len, direction); +} +EXPORT_SYMBOL_GPL(dma_buf_end_cpu_access); + +/** + * dma_buf_kmap_atomic - Map a page of the buffer object into kernel address + * space. The same restrictions as for kmap_atomic and friends apply. + * @dma_buf: [in] buffer to map page from. + * @page_num: [in] page in PAGE_SIZE units to map. + * + * This call must always succeed, any necessary preparations that might fail + * need to be done in begin_cpu_access. + */ +void *dma_buf_kmap_atomic(struct dma_buf *dmabuf, unsigned long page_num) +{ + WARN_ON(!dmabuf); + + return dmabuf->ops->kmap_atomic(dmabuf, page_num); +} +EXPORT_SYMBOL_GPL(dma_buf_kmap_atomic); + +/** + * dma_buf_kunmap_atomic - Unmap a page obtained by dma_buf_kmap_atomic. + * @dma_buf: [in] buffer to unmap page from. + * @page_num: [in] page in PAGE_SIZE units to unmap. + * @vaddr: [in] kernel space pointer obtained from dma_buf_kmap_atomic. + * + * This call must always succeed. + */ +void dma_buf_kunmap_atomic(struct dma_buf *dmabuf, unsigned long page_num, + void *vaddr) +{ + WARN_ON(!dmabuf); + + if (dmabuf->ops->kunmap_atomic) + dmabuf->ops->kunmap_atomic(dmabuf, page_num, vaddr); +} +EXPORT_SYMBOL_GPL(dma_buf_kunmap_atomic); + +/** + * dma_buf_kmap - Map a page of the buffer object into kernel address space. The + * same restrictions as for kmap and friends apply. + * @dma_buf: [in] buffer to map page from. + * @page_num: [in] page in PAGE_SIZE units to map. + * + * This call must always succeed, any necessary preparations that might fail + * need to be done in begin_cpu_access. + */ +void *dma_buf_kmap(struct dma_buf *dmabuf, unsigned long page_num) +{ + WARN_ON(!dmabuf); + + return dmabuf->ops->kmap(dmabuf, page_num); +} +EXPORT_SYMBOL_GPL(dma_buf_kmap); + +/** + * dma_buf_kunmap - Unmap a page obtained by dma_buf_kmap. + * @dma_buf: [in] buffer to unmap page from. + * @page_num: [in] page in PAGE_SIZE units to unmap. + * @vaddr: [in] kernel space pointer obtained from dma_buf_kmap. + * + * This call must always succeed. + */ +void dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long page_num, + void *vaddr) +{ + WARN_ON(!dmabuf); + + if (dmabuf->ops->kunmap) + dmabuf->ops->kunmap(dmabuf, page_num, vaddr); +} +EXPORT_SYMBOL_GPL(dma_buf_kunmap); diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index 6c9387d646ec..5401814c874d 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -16,10 +16,11 @@ #include <linux/interrupt.h> #include <linux/bitops.h> #include <linux/mutex.h> -#include <linux/kthread.h> +#include <linux/workqueue.h> #include <linux/highmem.h> #include <linux/firmware.h> #include <linux/slab.h> +#include <linux/sched.h> #define to_dev(obj) container_of(obj, struct device, kobj) @@ -81,6 +82,11 @@ enum { static int loading_timeout = 60; /* In seconds */ +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); @@ -440,13 +446,11 @@ fw_create_instance(struct firmware *firmware, const char *fw_name, { struct firmware_priv *fw_priv; struct device *f_dev; - int error; fw_priv = kzalloc(sizeof(*fw_priv) + strlen(fw_name) + 1 , GFP_KERNEL); if (!fw_priv) { dev_err(device, "%s: kmalloc failed\n", __func__); - error = -ENOMEM; - goto err_out; + return ERR_PTR(-ENOMEM); } fw_priv->fw = firmware; @@ -463,98 +467,80 @@ fw_create_instance(struct firmware *firmware, const char *fw_name, f_dev->parent = device; f_dev->class = &firmware_class; - dev_set_uevent_suppress(f_dev, true); - - /* Need to pin this module until class device is destroyed */ - __module_get(THIS_MODULE); - - error = device_add(f_dev); - if (error) { - dev_err(device, "%s: device_register failed\n", __func__); - goto err_put_dev; - } - - error = device_create_bin_file(f_dev, &firmware_attr_data); - if (error) { - dev_err(device, "%s: sysfs_create_bin_file failed\n", __func__); - goto err_del_dev; - } - - error = device_create_file(f_dev, &dev_attr_loading); - if (error) { - dev_err(device, "%s: device_create_file failed\n", __func__); - goto err_del_bin_attr; - } - - if (uevent) - dev_set_uevent_suppress(f_dev, false); - return fw_priv; - -err_del_bin_attr: - device_remove_bin_file(f_dev, &firmware_attr_data); -err_del_dev: - device_del(f_dev); -err_put_dev: - put_device(f_dev); -err_out: - return ERR_PTR(error); } -static void fw_destroy_instance(struct firmware_priv *fw_priv) -{ - struct device *f_dev = &fw_priv->dev; - - device_remove_file(f_dev, &dev_attr_loading); - device_remove_bin_file(f_dev, &firmware_attr_data); - device_unregister(f_dev); -} - -static int _request_firmware(const struct firmware **firmware_p, - const char *name, struct device *device, - bool uevent, bool nowait) +static struct firmware_priv * +_request_firmware_prepare(const struct firmware **firmware_p, const char *name, + struct device *device, bool uevent, bool nowait) { - struct firmware_priv *fw_priv; struct firmware *firmware; - int retval = 0; + struct firmware_priv *fw_priv; if (!firmware_p) - return -EINVAL; + return ERR_PTR(-EINVAL); *firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL); if (!firmware) { dev_err(device, "%s: kmalloc(struct firmware) failed\n", __func__); - return -ENOMEM; + return ERR_PTR(-ENOMEM); } if (fw_get_builtin_firmware(firmware, name)) { dev_dbg(device, "firmware: using built-in firmware %s\n", name); - return 0; + return NULL; + } + + fw_priv = fw_create_instance(firmware, name, device, uevent, nowait); + if (IS_ERR(fw_priv)) { + release_firmware(firmware); + *firmware_p = NULL; } + return fw_priv; +} - read_lock_usermodehelper(); +static void _request_firmware_cleanup(const struct firmware **firmware_p) +{ + release_firmware(*firmware_p); + *firmware_p = NULL; +} - if (WARN_ON(usermodehelper_is_disabled())) { - dev_err(device, "firmware: %s will not be loaded\n", name); - retval = -EBUSY; - goto out; +static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent, + long timeout) +{ + int retval = 0; + struct device *f_dev = &fw_priv->dev; + + dev_set_uevent_suppress(f_dev, true); + + /* Need to pin this module until class device is destroyed */ + __module_get(THIS_MODULE); + + retval = device_add(f_dev); + if (retval) { + dev_err(f_dev, "%s: device_register failed\n", __func__); + goto err_put_dev; } - if (uevent) - dev_dbg(device, "firmware: requesting %s\n", name); + retval = device_create_bin_file(f_dev, &firmware_attr_data); + if (retval) { + dev_err(f_dev, "%s: sysfs_create_bin_file failed\n", __func__); + goto err_del_dev; + } - fw_priv = fw_create_instance(firmware, name, device, uevent, nowait); - if (IS_ERR(fw_priv)) { - retval = PTR_ERR(fw_priv); - goto out; + retval = device_create_file(f_dev, &dev_attr_loading); + if (retval) { + dev_err(f_dev, "%s: device_create_file failed\n", __func__); + goto err_del_bin_attr; } if (uevent) { - if (loading_timeout > 0) + dev_set_uevent_suppress(f_dev, false); + dev_dbg(f_dev, "firmware: requesting %s\n", fw_priv->fw_id); + if (timeout != MAX_SCHEDULE_TIMEOUT) mod_timer(&fw_priv->timeout, - round_jiffies_up(jiffies + - loading_timeout * HZ)); + round_jiffies_up(jiffies + timeout)); kobject_uevent(&fw_priv->dev.kobj, KOBJ_ADD); } @@ -570,16 +556,13 @@ static int _request_firmware(const struct firmware **firmware_p, fw_priv->fw = NULL; mutex_unlock(&fw_lock); - fw_destroy_instance(fw_priv); - -out: - read_unlock_usermodehelper(); - - if (retval) { - release_firmware(firmware); - *firmware_p = NULL; - } - + device_remove_file(f_dev, &dev_attr_loading); +err_del_bin_attr: + device_remove_bin_file(f_dev, &firmware_attr_data); +err_del_dev: + device_del(f_dev); +err_put_dev: + put_device(f_dev); return retval; } @@ -602,7 +585,26 @@ int request_firmware(const struct firmware **firmware_p, const char *name, struct device *device) { - return _request_firmware(firmware_p, name, device, true, false); + struct firmware_priv *fw_priv; + int ret; + + fw_priv = _request_firmware_prepare(firmware_p, name, device, true, + false); + if (IS_ERR_OR_NULL(fw_priv)) + return PTR_RET(fw_priv); + + ret = usermodehelper_read_trylock(); + if (WARN_ON(ret)) { + dev_err(device, "firmware: %s will not be loaded\n", name); + } else { + ret = _request_firmware_load(fw_priv, true, + firmware_loading_timeout()); + usermodehelper_read_unlock(); + } + if (ret) + _request_firmware_cleanup(firmware_p); + + return ret; } /** @@ -629,25 +631,39 @@ struct firmware_work { bool uevent; }; -static int request_firmware_work_func(void *arg) +static void request_firmware_work_func(struct work_struct *work) { - struct firmware_work *fw_work = arg; + struct firmware_work *fw_work; const struct firmware *fw; + struct firmware_priv *fw_priv; + long timeout; int ret; - if (!arg) { - WARN_ON(1); - return 0; + fw_work = container_of(work, struct firmware_work, work); + fw_priv = _request_firmware_prepare(&fw, fw_work->name, fw_work->device, + fw_work->uevent, true); + if (IS_ERR_OR_NULL(fw_priv)) { + ret = PTR_RET(fw_priv); + goto out; + } + + timeout = usermodehelper_read_lock_wait(firmware_loading_timeout()); + if (timeout) { + ret = _request_firmware_load(fw_priv, fw_work->uevent, timeout); + usermodehelper_read_unlock(); + } else { + dev_dbg(fw_work->device, "firmware: %s loading timed out\n", + fw_work->name); + ret = -EAGAIN; } + if (ret) + _request_firmware_cleanup(&fw); - ret = _request_firmware(&fw, fw_work->name, fw_work->device, - fw_work->uevent, true); + out: fw_work->cont(fw, fw_work->context); module_put(fw_work->module); kfree(fw_work); - - return ret; } /** @@ -673,7 +689,6 @@ request_firmware_nowait( const char *name, struct device *device, gfp_t gfp, void *context, void (*cont)(const struct firmware *fw, void *context)) { - struct task_struct *task; struct firmware_work *fw_work; fw_work = kzalloc(sizeof (struct firmware_work), gfp); @@ -692,15 +707,8 @@ request_firmware_nowait( return -EFAULT; } - task = kthread_run(request_firmware_work_func, fw_work, - "firmware/%s", name); - if (IS_ERR(task)) { - fw_work->cont(NULL, fw_work->context); - module_put(fw_work->module); - kfree(fw_work); - return PTR_ERR(task); - } - + INIT_WORK(&fw_work->work, request_firmware_work_func); + schedule_work(&fw_work->work); return 0; } diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 541f821d4ea6..bd0f3949bcf9 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -532,6 +532,8 @@ static int rpm_suspend(struct device *dev, int rpmflags) dev->power.suspend_time = ktime_set(0, 0); dev->power.max_time_suspended_ns = -1; dev->power.deferred_resume = false; + wake_up_all(&dev->power.wait_queue); + if (retval == -EAGAIN || retval == -EBUSY) { dev->power.runtime_error = 0; @@ -547,7 +549,6 @@ static int rpm_suspend(struct device *dev, int rpmflags) } else { pm_runtime_cancel_pending(dev); } - wake_up_all(&dev->power.wait_queue); goto out; } diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c index 5157fa04c2f0..fb14a6343d4f 100644 --- a/drivers/base/regmap/regcache-rbtree.c +++ b/drivers/base/regmap/regcache-rbtree.c @@ -396,7 +396,7 @@ static int regcache_rbtree_sync(struct regmap *map, unsigned int min, map->cache_word_size); /* Is this the hardware default? If so skip. */ - ret = regcache_lookup_reg(map, i); + ret = regcache_lookup_reg(map, regtmp); if (ret >= 0 && val == map->reg_defaults[ret].def) continue; diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c index 58517a5dac13..251eb70f83e7 100644 --- a/drivers/base/regmap/regmap-debugfs.c +++ b/drivers/base/regmap/regmap-debugfs.c @@ -27,12 +27,6 @@ static size_t regmap_calc_reg_len(int max_val, char *buf, size_t buf_size) return strlen(buf); } -static int regmap_open_file(struct inode *inode, struct file *file) -{ - file->private_data = inode->i_private; - return 0; -} - static ssize_t regmap_name_read_file(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) @@ -57,7 +51,7 @@ static ssize_t regmap_name_read_file(struct file *file, } static const struct file_operations regmap_name_fops = { - .open = regmap_open_file, + .open = simple_open, .read = regmap_name_read_file, .llseek = default_llseek, }; @@ -174,7 +168,7 @@ static ssize_t regmap_map_write_file(struct file *file, #endif static const struct file_operations regmap_map_fops = { - .open = regmap_open_file, + .open = simple_open, .read = regmap_map_read_file, .write = regmap_map_write_file, .llseek = default_llseek, @@ -243,7 +237,7 @@ out: } static const struct file_operations regmap_access_fops = { - .open = regmap_open_file, + .open = simple_open, .read = regmap_access_read_file, .llseek = default_llseek, }; |