diff options
| -rw-r--r-- | drivers/base/arch_topology.c | 20 | ||||
| -rw-r--r-- | drivers/base/base.h | 19 | ||||
| -rw-r--r-- | drivers/base/bus.c | 1 | ||||
| -rw-r--r-- | drivers/base/class.c | 1 | ||||
| -rw-r--r-- | drivers/base/component.c | 11 | ||||
| -rw-r--r-- | drivers/base/dd.c | 5 | ||||
| -rw-r--r-- | drivers/base/devtmpfs.c | 79 | ||||
| -rw-r--r-- | drivers/base/driver.c | 1 | ||||
| -rw-r--r-- | drivers/base/firmware_loader/fallback.c | 11 | ||||
| -rw-r--r-- | drivers/base/firmware_loader/firmware.h | 16 | ||||
| -rw-r--r-- | drivers/base/firmware_loader/main.c | 2 | ||||
| -rw-r--r-- | drivers/base/platform.c | 12 | ||||
| -rw-r--r-- | drivers/base/test/test_async_driver_probe.c | 3 | ||||
| -rw-r--r-- | fs/debugfs/file.c | 38 | ||||
| -rw-r--r-- | fs/debugfs/inode.c | 9 | ||||
| -rw-r--r-- | fs/kernfs/dir.c | 2 | ||||
| -rw-r--r-- | include/linux/dev_printk.h | 235 | ||||
| -rw-r--r-- | include/linux/device.h | 999 | ||||
| -rw-r--r-- | include/linux/device/bus.h | 288 | ||||
| -rw-r--r-- | include/linux/device/class.h | 266 | ||||
| -rw-r--r-- | include/linux/device/driver.h | 292 | ||||
| -rw-r--r-- | init/main.c | 2 |
22 files changed, 1219 insertions, 1093 deletions
diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c index 1eb81f113786..6119e11a9f95 100644 --- a/drivers/base/arch_topology.c +++ b/drivers/base/arch_topology.c @@ -248,6 +248,16 @@ core_initcall(free_raw_capacity); #endif #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV) +/* + * This function returns the logic cpu number of the node. + * There are basically three kinds of return values: + * (1) logic cpu number which is > 0. + * (2) -ENODEV when the device tree(DT) node is valid and found in the DT but + * there is no possible logical CPU in the kernel to match. This happens + * when CONFIG_NR_CPUS is configure to be smaller than the number of + * CPU nodes in DT. We need to just ignore this case. + * (3) -1 if the node does not exist in the device tree + */ static int __init get_cpu_for_node(struct device_node *node) { struct device_node *cpu_node; @@ -261,7 +271,8 @@ static int __init get_cpu_for_node(struct device_node *node) if (cpu >= 0) topology_parse_cpu_capacity(cpu_node, cpu); else - pr_crit("Unable to find CPU node for %pOF\n", cpu_node); + pr_info("CPU node for %pOF exist but the possible cpu range is :%*pbl\n", + cpu_node, cpumask_pr_args(cpu_possible_mask)); of_node_put(cpu_node); return cpu; @@ -286,9 +297,8 @@ static int __init parse_core(struct device_node *core, int package_id, cpu_topology[cpu].package_id = package_id; cpu_topology[cpu].core_id = core_id; cpu_topology[cpu].thread_id = i; - } else { - pr_err("%pOF: Can't get CPU for thread\n", - t); + } else if (cpu != -ENODEV) { + pr_err("%pOF: Can't get CPU for thread\n", t); of_node_put(t); return -EINVAL; } @@ -307,7 +317,7 @@ static int __init parse_core(struct device_node *core, int package_id, cpu_topology[cpu].package_id = package_id; cpu_topology[cpu].core_id = core_id; - } else if (leaf) { + } else if (leaf && cpu != -ENODEV) { pr_err("%pOF: Can't get CPU for leaf core\n", core); return -EINVAL; } diff --git a/drivers/base/base.h b/drivers/base/base.h index 0d32544b6f91..40fb069a8a7e 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -1,4 +1,15 @@ /* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org> + * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de> + * Copyright (c) 2008-2012 Novell Inc. + * Copyright (c) 2012-2019 Greg Kroah-Hartman <gregkh@linuxfoundation.org> + * Copyright (c) 2012-2019 Linux Foundation + * + * Core driver model functions and structures that should not be + * shared outside of the drivers/base/ directory. + * + */ #include <linux/notifier.h> /** @@ -175,3 +186,11 @@ extern void device_links_unbind_consumers(struct device *dev); /* device pm support */ void device_pm_move_to_tail(struct device *dev); + +#ifdef CONFIG_DEVTMPFS +int devtmpfs_create_node(struct device *dev); +int devtmpfs_delete_node(struct device *dev); +#else +static inline int devtmpfs_create_node(struct device *dev) { return 0; } +static inline int devtmpfs_delete_node(struct device *dev) { return 0; } +#endif diff --git a/drivers/base/bus.c b/drivers/base/bus.c index a1d1e8256324..886e9054999a 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -9,6 +9,7 @@ */ #include <linux/async.h> +#include <linux/device/bus.h> #include <linux/device.h> #include <linux/module.h> #include <linux/errno.h> diff --git a/drivers/base/class.c b/drivers/base/class.c index d8a6a5864c2e..bcd410e6d70a 100644 --- a/drivers/base/class.c +++ b/drivers/base/class.c @@ -8,6 +8,7 @@ * Copyright (c) 2003-2004 IBM Corp. */ +#include <linux/device/class.h> #include <linux/device.h> #include <linux/module.h> #include <linux/init.h> diff --git a/drivers/base/component.c b/drivers/base/component.c index 532a3a5d8f63..c7879f5ae2fb 100644 --- a/drivers/base/component.c +++ b/drivers/base/component.c @@ -11,7 +11,6 @@ #include <linux/device.h> #include <linux/kref.h> #include <linux/list.h> -#include <linux/module.h> #include <linux/mutex.h> #include <linux/slab.h> #include <linux/debugfs.h> @@ -102,11 +101,11 @@ static int component_devices_show(struct seq_file *s, void *data) seq_printf(s, "%-40s %20s\n", "device name", "status"); seq_puts(s, "-------------------------------------------------------------\n"); for (i = 0; i < match->num; i++) { - struct device *d = (struct device *)match->compare[i].data; + struct component *component = match->compare[i].component; - seq_printf(s, "%-40s %20s\n", dev_name(d), - match->compare[i].component ? - "registered" : "not registered"); + seq_printf(s, "%-40s %20s\n", + component ? dev_name(component->dev) : "(unknown)", + component ? (component->bound ? "bound" : "not bound") : "not registered"); } mutex_unlock(&component_mutex); @@ -775,5 +774,3 @@ void component_del(struct device *dev, const struct component_ops *ops) kfree(component); } EXPORT_SYMBOL_GPL(component_del); - -MODULE_LICENSE("GPL v2"); diff --git a/drivers/base/dd.c b/drivers/base/dd.c index d811e60610d3..b25bcab2a26b 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -516,7 +516,10 @@ static int really_probe(struct device *dev, struct device_driver *drv) atomic_inc(&probe_count); pr_debug("bus: '%s': %s: probing driver %s with device %s\n", drv->bus->name, __func__, drv->name, dev_name(dev)); - WARN_ON(!list_empty(&dev->devres_head)); + if (!list_empty(&dev->devres_head)) { + dev_crit(dev, "Resources present before probing\n"); + return -EBUSY; + } re_probe: dev->driver = drv; diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c index 6cdbf1531238..5995c437cbdf 100644 --- a/drivers/base/devtmpfs.c +++ b/drivers/base/devtmpfs.c @@ -30,11 +30,7 @@ static struct task_struct *thread; -#if defined CONFIG_DEVTMPFS_MOUNT -static int mount_dev = 1; -#else -static int mount_dev; -#endif +static int __initdata mount_dev = IS_ENABLED(CONFIG_DEVTMPFS_MOUNT); static DEFINE_SPINLOCK(req_lock); @@ -93,6 +89,23 @@ static inline int is_blockdev(struct device *dev) static inline int is_blockdev(struct device *dev) { return 0; } #endif +static int devtmpfs_submit_req(struct req *req, const char *tmp) +{ + init_completion(&req->done); + + spin_lock(&req_lock); + req->next = requests; + requests = req; + spin_unlock(&req_lock); + + wake_up_process(thread); + wait_for_completion(&req->done); + + kfree(tmp); + + return req->err; +} + int devtmpfs_create_node(struct device *dev) { const char *tmp = NULL; @@ -117,19 +130,7 @@ int devtmpfs_create_node(struct device *dev) req.dev = dev; - init_completion(&req.done); - - spin_lock(&req_lock); - req.next = requests; - requests = &req; - spin_unlock(&req_lock); - - wake_up_process(thread); - wait_for_completion(&req.done); - - kfree(tmp); - - return req.err; + return devtmpfs_submit_req(&req, tmp); } int devtmpfs_delete_node(struct device *dev) @@ -147,18 +148,7 @@ int devtmpfs_delete_node(struct device *dev) req.mode = 0; req.dev = dev; - init_completion(&req.done); - - spin_lock(&req_lock); - req.next = requests; - requests = &req; - spin_unlock(&req_lock); - - wake_up_process(thread); - wait_for_completion(&req.done); - - kfree(tmp); - return req.err; + return devtmpfs_submit_req(&req, tmp); } static int dev_mkdir(const char *name, umode_t mode) @@ -359,7 +349,7 @@ static int handle_remove(const char *nodename, struct device *dev) * If configured, or requested by the commandline, devtmpfs will be * auto-mounted after the kernel mounted the root filesystem. */ -int devtmpfs_mount(void) +int __init devtmpfs_mount(void) { int err; @@ -388,18 +378,30 @@ static int handle(const char *name, umode_t mode, kuid_t uid, kgid_t gid, return handle_remove(name, dev); } -static int devtmpfsd(void *p) +static int devtmpfs_setup(void *p) { - int *err = p; - *err = ksys_unshare(CLONE_NEWNS); - if (*err) + int err; + + err = ksys_unshare(CLONE_NEWNS); + if (err) goto out; - *err = do_mount("devtmpfs", "/", "devtmpfs", MS_SILENT, NULL); - if (*err) + err = do_mount("devtmpfs", "/", "devtmpfs", MS_SILENT, NULL); + if (err) goto out; ksys_chdir("/.."); /* will traverse into overmounted root */ ksys_chroot("."); +out: + *(int *)p = err; complete(&setup_done); + return err; +} + +static int devtmpfsd(void *p) +{ + int err = devtmpfs_setup(p); + + if (err) + return err; while (1) { spin_lock(&req_lock); while (requests) { @@ -420,9 +422,6 @@ static int devtmpfsd(void *p) schedule(); } return 0; -out: - complete(&setup_done); - return *err; } /* diff --git a/drivers/base/driver.c b/drivers/base/driver.c index 4e5ca632f35e..57c68769e157 100644 --- a/drivers/base/driver.c +++ b/drivers/base/driver.c @@ -8,6 +8,7 @@ * Copyright (c) 2007 Novell Inc. */ +#include <linux/device/driver.h> #include <linux/device.h> #include <linux/module.h> #include <linux/errno.h> diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c index 62ee90b4db56..8704e1bae175 100644 --- a/drivers/base/firmware_loader/fallback.c +++ b/drivers/base/firmware_loader/fallback.c @@ -606,7 +606,7 @@ static bool fw_run_sysfs_fallback(enum fw_opt opt_flags) return false; } - if ((opt_flags & FW_OPT_NOFALLBACK)) + if ((opt_flags & FW_OPT_NOFALLBACK_SYSFS)) return false; /* Also permit LSMs and IMA to fail firmware sysfs fallback */ @@ -630,10 +630,11 @@ static bool fw_run_sysfs_fallback(enum fw_opt opt_flags) * interface. Userspace is in charge of loading the firmware through the sysfs * loading interface. This sysfs fallback mechanism may be disabled completely * on a system by setting the proc sysctl value ignore_sysfs_fallback to true. - * If this false we check if the internal API caller set the @FW_OPT_NOFALLBACK - * flag, if so it would also disable the fallback mechanism. A system may want - * to enfoce the sysfs fallback mechanism at all times, it can do this by - * setting ignore_sysfs_fallback to false and force_sysfs_fallback to true. + * If this is false we check if the internal API caller set the + * @FW_OPT_NOFALLBACK_SYSFS flag, if so it would also disable the fallback + * mechanism. A system may want to enforce the sysfs fallback mechanism at all + * times, it can do this by setting ignore_sysfs_fallback to false and + * force_sysfs_fallback to true. * Enabling force_sysfs_fallback is functionally equivalent to build a kernel * with CONFIG_FW_LOADER_USER_HELPER_FALLBACK. **/ diff --git a/drivers/base/firmware_loader/firmware.h b/drivers/base/firmware_loader/firmware.h index 7ecd590e67fe..8656e5239a80 100644 --- a/drivers/base/firmware_loader/firmware.h +++ b/drivers/base/firmware_loader/firmware.h @@ -27,16 +27,16 @@ * firmware file lookup on storage is avoided. Used for calls where the * file may be too big, or where the driver takes charge of its own * firmware caching mechanism. - * @FW_OPT_NOFALLBACK: Disable the fallback mechanism. Takes precedence over - * &FW_OPT_UEVENT and &FW_OPT_USERHELPER. + * @FW_OPT_NOFALLBACK_SYSFS: Disable the sysfs fallback mechanism. Takes + * precedence over &FW_OPT_UEVENT and &FW_OPT_USERHELPER. */ enum fw_opt { - FW_OPT_UEVENT = BIT(0), - FW_OPT_NOWAIT = BIT(1), - FW_OPT_USERHELPER = BIT(2), - FW_OPT_NO_WARN = BIT(3), - FW_OPT_NOCACHE = BIT(4), - FW_OPT_NOFALLBACK = BIT(5), + FW_OPT_UEVENT = BIT(0), + FW_OPT_NOWAIT = BIT(1), + FW_OPT_USERHELPER = BIT(2), + FW_OPT_NO_WARN = BIT(3), + FW_OPT_NOCACHE = BIT(4), + FW_OPT_NOFALLBACK_SYSFS = BIT(5), }; enum fw_status { diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c index 249add8c5e05..57133a9dad09 100644 --- a/drivers/base/firmware_loader/main.c +++ b/drivers/base/firmware_loader/main.c @@ -877,7 +877,7 @@ int request_firmware_direct(const struct firmware **firmware_p, __module_get(THIS_MODULE); ret = _request_firmware(firmware_p, name, device, NULL, 0, FW_OPT_UEVENT | FW_OPT_NO_WARN | - FW_OPT_NOFALLBACK); + FW_OPT_NOFALLBACK_SYSFS); module_put(THIS_MODULE); return ret; } diff --git a/drivers/base/platform.c b/drivers/base/platform.c index cf6b6b722e5c..7fa654f1288b 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -27,6 +27,7 @@ #include <linux/limits.h> #include <linux/property.h> #include <linux/kmemleak.h> +#include <linux/types.h> #include "base.h" #include "power/power.h" @@ -48,7 +49,7 @@ EXPORT_SYMBOL_GPL(platform_bus); struct resource *platform_get_resource(struct platform_device *dev, unsigned int type, unsigned int num) { - int i; + u32 i; for (i = 0; i < dev->num_resources; i++) { struct resource *r = &dev->resource[i]; @@ -255,7 +256,7 @@ struct resource *platform_get_resource_byname(struct platform_device *dev, unsigned int type, const char *name) { - int i; + u32 i; for (i = 0; i < dev->num_resources; i++) { struct resource *r = &dev->resource[i]; @@ -501,7 +502,8 @@ EXPORT_SYMBOL_GPL(platform_device_add_properties); */ int platform_device_add(struct platform_device *pdev) { - int i, ret; + u32 i; + int ret; if (!pdev) return -EINVAL; @@ -569,7 +571,7 @@ int platform_device_add(struct platform_device *pdev) pdev->id = PLATFORM_DEVID_AUTO; } - while (--i >= 0) { + while (i--) { struct resource *r = &pdev->resource[i]; if (r->parent) release_resource(r); @@ -590,7 +592,7 @@ EXPORT_SYMBOL_GPL(platform_device_add); */ void platform_device_del(struct platform_device *pdev) { - int i; + u32 i; if (!IS_ERR_OR_NULL(pdev)) { device_del(&pdev->dev); diff --git a/drivers/base/test/test_async_driver_probe.c b/drivers/base/test/test_async_driver_probe.c index f4b1d8e54daf..3bb7beb127a9 100644 --- a/drivers/base/test/test_async_driver_probe.c +++ b/drivers/base/test/test_async_driver_probe.c @@ -44,7 +44,8 @@ static int test_probe(struct platform_device *pdev) * performing an async init on that node. */ if (dev->driver->probe_type == PROBE_PREFER_ASYNCHRONOUS) { - if (dev_to_node(dev) != numa_node_id()) { + if (IS_ENABLED(CONFIG_NUMA) && + dev_to_node(dev) != numa_node_id()) { dev_warn(dev, "NUMA node mismatch %d != %d\n", dev_to_node(dev), numa_node_id()); atomic_inc(&warnings); diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c index dede25247b81..634b09d18b77 100644 --- a/fs/debugfs/file.c +++ b/fs/debugfs/file.c @@ -142,18 +142,21 @@ EXPORT_SYMBOL_GPL(debugfs_file_put); * We also need to exclude any file that has ways to write or alter it as root * can bypass the permissions check. */ -static bool debugfs_is_locked_down(struct inode *inode, - struct file *filp, - const struct file_operations *real_fops) +static int debugfs_locked_down(struct inode *inode, + struct file *filp, + const struct file_operations *real_fops) { if ((inode->i_mode & 07777) == 0444 && !(filp->f_mode & FMODE_WRITE) && !real_fops->unlocked_ioctl && !real_fops->compat_ioctl && !real_fops->mmap) - return false; + return 0; - return security_locked_down(LOCKDOWN_DEBUGFS); + if (security_locked_down(LOCKDOWN_DEBUGFS)) + return -EPERM; + + return 0; } static int open_proxy_open(struct inode *inode, struct file *filp) @@ -168,7 +171,7 @@ static int open_proxy_open(struct inode *inode, struct file *filp) real_fops = debugfs_real_fops(filp); - r = debugfs_is_locked_down(inode, filp, real_fops); + r = debugfs_locked_down(inode, filp, real_fops); if (r) goto out; @@ -298,7 +301,7 @@ static int full_proxy_open(struct inode *inode, struct file *filp) real_fops = debugfs_real_fops(filp); - r = debugfs_is_locked_down(inode, filp, real_fops); + r = debugfs_locked_down(inode, filp, real_fops); if (r) goto out; @@ -496,10 +499,10 @@ DEFINE_DEBUGFS_ATTRIBUTE(fops_u32_wo, NULL, debugfs_u32_set, "%llu\n"); * This function will return a pointer to a dentry if it succeeds. This * pointer must be passed to the debugfs_remove() function when the file is * to be removed (no automatic cleanup happens if your module is unloaded, - * you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) will be + * you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be * returned. * - * If debugfs is not enabled in the kernel, the value %ERR_PTR(-ENODEV) will + * If debugfs is not enabled in the kernel, the value ERR_PTR(-ENODEV) will * be returned. */ struct dentry *debugfs_create_u32(const char *name, umode_t mode, @@ -581,10 +584,10 @@ DEFINE_DEBUGFS_ATTRIBUTE(fops_ulong_wo, NULL, debugfs_ulong_set, "%llu\n"); * This function will return a pointer to a dentry if it succeeds. This * pointer must be passed to the debugfs_remove() function when the file is * to be removed (no automatic cleanup happens if your module is unloaded, - * you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) will be + * you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be * returned. * - * If debugfs is not enabled in the kernel, the value %ERR_PTR(-ENODEV) will + * If debugfs is not enabled in the kernel, the value ERR_PTR(-ENODEV) will * be returned. */ struct dentry *debugfs_create_ulong(const char *name, umode_t mode, @@ -846,10 +849,10 @@ static const struct file_operations fops_bool_wo = { * This function will return a pointer to a dentry if it succeeds. This * pointer must be passed to the debugfs_remove() function when the file is * to be removed (no automatic cleanup happens if your module is unloaded, - * you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) will be + * you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be * returned. * - * If debugfs is not enabled in the kernel, the value %ERR_PTR(-ENODEV) will + * If debugfs is not enabled in the kernel, the value ERR_PTR(-ENODEV) will * be returned. */ struct dentry *debugfs_create_bool(const char *name, umode_t mode, @@ -899,10 +902,10 @@ static const struct file_operations fops_blob = { * This function will return a pointer to a dentry if it succeeds. This * pointer must be passed to the debugfs_remove() function when the file is * to be removed (no automatic cleanup happens if your module is unloaded, - * you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) will be + * you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be * returned. * - * If debugfs is not enabled in the kernel, the value %ERR_PTR(-ENODEV) will + * If debugfs is not enabled in the kernel, the value ERR_PTR(-ENODEV) will * be returned. */ struct dentry *debugfs_create_blob(const char *name, umode_t mode, @@ -1091,10 +1094,10 @@ static const struct file_operations fops_regset32 = { * This function will return a pointer to a dentry if it succeeds. This * pointer must be passed to the debugfs_remove() function when the file is * to be removed (no automatic cleanup happens if your module is unloaded, - * you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) will be + * you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be * returned. * - * If debugfs is not enabled in the kernel, the value %ERR_PTR(-ENODEV) will + * If debugfs is not enabled in the kernel, the value ERR_PTR(-ENODEV) will * be returned. */ struct dentry *debugfs_create_regset32(const char *name, umode_t mode, @@ -1158,4 +1161,3 @@ struct dentry *debugfs_create_devm_seqfile(struct device *dev, const char *name, &debugfs_devm_entry_ops); } EXPORT_SYMBOL_GPL(debugfs_create_devm_seqfile); - diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c index f4d8df5e4714..dc6cffc4feba 100644 --- a/fs/debugfs/inode.c +++ b/fs/debugfs/inode.c @@ -423,7 +423,7 @@ static struct dentry *__debugfs_create_file(const char *name, umode_t mode, * This function will return a pointer to a dentry if it succeeds. This * pointer must be passed to the debugfs_remove() function when the file is * to be removed (no automatic cleanup happens if your module is unloaded, - * you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) will be + * you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be * returned. * * If debugfs is not enabled in the kernel, the value -%ENODEV will be @@ -502,7 +502,7 @@ EXPORT_SYMBOL_GPL(debugfs_create_file_unsafe); * This function will return a pointer to a dentry if it succeeds. This * pointer must be passed to the debugfs_remove() function when the file is * to be removed (no automatic cleanup happens if your module is unloaded, - * you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) will be + * you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be * returned. * * If debugfs is not enabled in the kernel, the value -%ENODEV will be @@ -534,7 +534,7 @@ EXPORT_SYMBOL_GPL(debugfs_create_file_size); * This function will return a pointer to a dentry if it succeeds. This * pointer must be passed to the debugfs_remove() function when the file is * to be removed (no automatic cleanup happens if your module is unloaded, - * you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) will be + * you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be * returned. * * If debugfs is not enabled in the kernel, the value -%ENODEV will be @@ -627,7 +627,7 @@ EXPORT_SYMBOL(debugfs_create_automount); * This function will return a pointer to a dentry if it succeeds. This * pointer must be passed to the debugfs_remove() function when the symbolic * link is to be removed (no automatic cleanup happens if your module is - * unloaded, you are responsible here.) If an error occurs, %ERR_PTR(-ERROR) + * unloaded, you are responsible here.) If an error occurs, ERR_PTR(-ERROR) * will be returned. * * If debugfs is not enabled in the kernel, the value -%ENODEV will be @@ -906,4 +906,3 @@ static int __init debugfs_init(void) return retval; } core_initcall(debugfs_init); - diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c index 9d96e6871e1a..9aec80b9d7c6 100644 --- a/fs/kernfs/dir.c +++ b/fs/kernfs/dir.c @@ -1266,7 +1266,7 @@ void kernfs_activate(struct kernfs_node *kn) pos = NULL; while ((pos = kernfs_next_descendant_post(pos, kn))) { - if (!pos || (pos->flags & KERNFS_ACTIVATED)) + if (pos->flags & KERNFS_ACTIVATED) continue; WARN_ON_ONCE(pos->parent && RB_EMPTY_NODE(&pos->rb)); diff --git a/include/linux/dev_printk.h b/include/linux/dev_printk.h new file mode 100644 index 000000000000..5aad06b4ca7b --- /dev/null +++ b/include/linux/dev_printk.h @@ -0,0 +1,235 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * dev_printk.h - printk messages helpers for devices + * + * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org> + * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de> + * Copyright (c) 2008-2009 Novell Inc. + * + */ + +#ifndef _DEVICE_PRINTK_H_ +#define _DEVICE_PRINTK_H_ + +#include <linux/compiler.h> +#include <linux/types.h> +#include <linux/ratelimit.h> + +#ifndef dev_fmt +#define dev_fmt(fmt) fmt +#endif + +struct device; + +#ifdef CONFIG_PRINTK + +__printf(3, 0) __cold +int dev_vprintk_emit(int level, const struct device *dev, + const char *fmt, va_list args); +__printf(3, 4) __cold +int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...); + +__printf(3, 4) __cold +void dev_printk(const char *level, const struct device *dev, + const char *fmt, ...); +__printf(2, 3) __cold +void _dev_emerg(const struct device *dev, const char *fmt, ...); +__printf(2, 3) __cold +void _dev_alert(const struct device *dev, const char *fmt, ...); +__printf(2, 3) __cold +void _dev_crit(const struct device *dev, const char *fmt, ...); +__printf(2, 3) __cold +void _dev_err(const struct device *dev, const char *fmt, ...); +__printf(2, 3) __cold +void _dev_warn(const struct device *dev, const char *fmt, ...); +__printf(2, 3) __cold +void _dev_notice(const struct device *dev, const char *fmt, ...); +__printf(2, 3) __cold +void _dev_info(const struct device *dev, const char *fmt, ...); + +#else + +static inline __printf(3, 0) +int dev_vprintk_emit(int level, const struct device *dev, + const char *fmt, va_list args) +{ return 0; } +static inline __printf(3, 4) +int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) +{ return 0; } + +static inline void __dev_printk(const char *level, const struct device *dev, + struct va_format *vaf) +{} +static inline __printf(3, 4) +void dev_printk(const char *level, const struct device *dev, + const char *fmt, ...) +{} + +static inline __printf(2, 3) +void _dev_emerg(const struct device *dev, const char *fmt, ...) +{} +static inline __printf(2, 3) +void _dev_crit(const struct device *dev, const char *fmt, ...) +{} +static inline __printf(2, 3) +void _dev_alert(const struct device *dev, const char *fmt, ...) +{} +static inline __printf(2, 3) +void _dev_err(const struct device *dev, const char *fmt, ...) +{} +static inline __printf(2, 3) +void _dev_warn(const struct device *dev, const char *fmt, ...) +{} +static inline __printf(2, 3) +void _dev_notice(const struct device *dev, const char *fmt, ...) +{} +static inline __printf(2, 3) +void _dev_info(const struct device *dev, const char *fmt, ...) +{} + +#endif + +/* + * #defines for all the dev_<level> macros to prefix with whatever + * possible use of #define dev_fmt(fmt) ... + */ + +#define dev_emerg(dev, fmt, ...) \ + _dev_emerg(dev, dev_fmt(fmt), ##__VA_ARGS__) +#define dev_crit(dev, fmt, ...) \ + _dev_crit(dev, dev_fmt(fmt), ##__VA_ARGS__) +#define dev_alert(dev, fmt, ...) \ + _dev_alert(dev, dev_fmt(fmt), ##__VA_ARGS__) +#define dev_err(dev, fmt, ...) \ + _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__) +#define dev_warn(dev, fmt, ...) \ + _dev_warn(dev, dev_fmt(fmt), ##__VA_ARGS__) +#define dev_notice(dev, fmt, ...) \ + _dev_notice(dev, dev_fmt(fmt), ##__VA_ARGS__) +#define dev_info(dev, fmt, ...) \ + _dev_info(dev, dev_fmt(fmt), ##__VA_ARGS__) + +#if defined(CONFIG_DYNAMIC_DEBUG) +#define dev_dbg(dev, fmt, ...) \ + dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__) +#elif defined(DEBUG) +#define dev_dbg(dev, fmt, ...) \ + dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__) +#else +#define dev_dbg(dev, fmt, ...) \ +({ \ + if (0) \ + dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \ +}) +#endif + +#ifdef CONFIG_PRINTK +#define dev_level_once(dev_level, dev, fmt, ...) \ +do { \ + static bool __print_once __read_mostly; \ + \ + if (!__print_once) { \ + __print_once = true; \ + dev_level(dev, fmt, ##__VA_ARGS__); \ + } \ +} while (0) +#else +#define dev_level_once(dev_level, dev, fmt, ...) \ +do { \ + if (0) \ + dev_level(dev, fmt, ##__VA_ARGS__); \ +} while (0) +#endif + +#define dev_emerg_once(dev, fmt, ...) \ + dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__) +#define dev_alert_once(dev, fmt, ...) \ + dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__) +#define dev_crit_once(dev, fmt, ...) \ + dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__) +#define dev_err_once(dev, fmt, ...) \ + dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__) +#define dev_warn_once(dev, fmt, ...) \ + dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__) +#define dev_notice_once(dev, fmt, ...) \ + dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__) +#define dev_info_once(dev, fmt, ...) \ + dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__) +#define dev_dbg_once(dev, fmt, ...) \ + dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__) + +#define dev_level_ratelimited(dev_level, dev, fmt, ...) \ +do { \ + static DEFINE_RATELIMIT_STATE(_rs, \ + DEFAULT_RATELIMIT_INTERVAL, \ + DEFAULT_RATELIMIT_BURST); \ + if (__ratelimit(&_rs)) \ + dev_level(dev, fmt, ##__VA_ARGS__); \ +} while (0) + +#define dev_emerg_ratelimited(dev, fmt, ...) \ + dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__) +#define dev_alert_ratelimited(dev, fmt, ...) \ + dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__) +#define dev_crit_ratelimited(dev, fmt, ...) \ + dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__) +#define dev_err_ratelimited(dev, fmt, ...) \ + dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__) +#define dev_warn_ratelimited(dev, fmt, ...) \ + dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__) +#define dev_notice_ratelimited(dev, fmt, ...) \ + dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__) +#define dev_info_ratelimited(dev, fmt, ...) \ + dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__) +#if defined(CONFIG_DYNAMIC_DEBUG) +/* descriptor check is first to prevent flooding with "callbacks suppressed" */ +#define dev_dbg_ratelimited(dev, fmt, ...) \ +do { \ + static DEFINE_RATELIMIT_STATE(_rs, \ + DEFAULT_RATELIMIT_INTERVAL, \ + DEFAULT_RATELIMIT_BURST); \ + DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ + if (DYNAMIC_DEBUG_BRANCH(descriptor) && \ + __ratelimit(&_rs)) \ + __dynamic_dev_dbg(&descriptor, dev, dev_fmt(fmt), \ + ##__VA_ARGS__); \ +} while (0) +#elif defined(DEBUG) +#define dev_dbg_ratelimited(dev, fmt, ...) \ +do { \ + static DEFINE_RATELIMIT_STATE(_rs, \ + DEFAULT_RATELIMIT_INTERVAL, \ + DEFAULT_RATELIMIT_BURST); \ + if (__ratelimit(&_rs)) \ + dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \ +} while (0) +#else +#define dev_dbg_ratelimited(dev, fmt, ...) \ +do { \ + if (0) \ + dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \ +} while (0) +#endif + +#ifdef VERBOSE_DEBUG +#define dev_vdbg dev_dbg +#else +#define dev_vdbg(dev, fmt, ...) \ +({ \ + if (0) \ + dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \ +}) +#endif + +/* + * dev_WARN*() acts like dev_printk(), but with the key difference of + * using WARN/WARN_ONCE to include file/line information and a backtrace. + */ +#define dev_WARN(dev, format, arg...) \ + WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg); + +#define dev_WARN_ONCE(dev, condition, format, arg...) \ + WARN_ONCE(condition, "%s %s: " format, \ + dev_driver_string(dev), dev_name(dev), ## arg) + +#endif /* _DEVICE_PRINTK_H_ */ diff --git a/include/linux/device.h b/include/linux/device.h index 96ff76731e93..0cd7c647c16c 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -12,6 +12,7 @@ #ifndef _DEVICE_H_ #define _DEVICE_H_ +#include <linux/dev_printk.h> #include <linux/ioport.h> #include <linux/kobject.h> #include <linux/klist.h> @@ -22,10 +23,12 @@ #include <linux/mutex.h> #include <linux/pm.h> #include <linux/atomic.h> -#include <linux/ratelimit.h> #include <linux/uidgid.h> #include <linux/gfp.h> #include <linux/overflow.h> +#include <linux/device/bus.h> +#include <linux/device/class.h> +#include <linux/device/driver.h> #include <asm/device.h> struct device; @@ -35,7 +38,6 @@ struct driver_private; struct module; struct class; struct subsys_private; -struct bus_type; struct device_node; struct fwnode_handle; struct iommu_ops; @@ -44,490 +46,6 @@ struct iommu_fwspec; struct dev_pin_info; struct iommu_param; -struct bus_attribute { - struct attribute attr; - ssize_t (*show)(struct bus_type *bus, char *buf); - ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count); -}; - -#define BUS_ATTR_RW(_name) \ - struct bus_attribute bus_attr_##_name = __ATTR_RW(_name) -#define BUS_ATTR_RO(_name) \ - struct bus_attribute bus_attr_##_name = __ATTR_RO(_name) -#define BUS_ATTR_WO(_name) \ - struct bus_attribute bus_attr_##_name = __ATTR_WO(_name) - -extern int __must_check bus_create_file(struct bus_type *, - struct bus_attribute *); -extern void bus_remove_file(struct bus_type *, struct bus_attribute *); - -/** - * struct bus_type - The bus type of the device - * - * @name: The name of the bus. - * @dev_name: Used for subsystems to enumerate devices like ("foo%u", dev->id). - * @dev_root: Default device to use as the parent. - * @bus_groups: Default attributes of the bus. - * @dev_groups: Default attributes of the devices on the bus. - * @drv_groups: Default attributes of the device drivers on the bus. - * @match: Called, perhaps multiple times, whenever a new device or driver - * is added for this bus. It should return a positive value if the - * given device can be handled by the given driver and zero - * otherwise. It may also return error code if determining that - * the driver supports the device is not possible. In case of - * -EPROBE_DEFER it will queue the device for deferred probing. - * @uevent: Called when a device is added, removed, or a few other things - * that generate uevents to add the environment variables. - * @probe: Called when a new device or driver add to this bus, and callback - * the specific driver's probe to initial the matched device. - * @sync_state: Called to sync device state to software state after all the - * state tracking consumers linked to this device (present at - * the time of late_initcall) have successfully bound to a - * driver. If the device has no consumers, this function will - * be called at late_initcall_sync level. If the device has - * consumers that are never bound to a driver, this function - * will never get called until they do. - * @remove: Called when a device removed from this bus. - * @shutdown: Called at shut-down time to quiesce the device. - * - * @online: Called to put the device back online (after offlining it). - * @offline: Called to put the device offline for hot-removal. May fail. - * - * @suspend: Called when a device on this bus wants to go to sleep mode. - * @resume: Called to bring a device on this bus out of sleep mode. - * @num_vf: Called to find out how many virtual functions a device on this - * bus supports. - * @dma_configure: Called to setup DMA configuration on a device on - * this bus. - * @pm: Power management operations of this bus, callback the specific - * device driver's pm-ops. - * @iommu_ops: IOMMU specific operations for this bus, used to attach IOMMU - * driver implementations to a bus and allow the driver to do - * bus-specific setup - * @p: The private data of the driver core, only the driver core can - * touch this. - * @lock_key: Lock class key for use by the lock validator - * @need_parent_lock: When probing or removing a device on this bus, the - * device core should lock the device's parent. - * - * A bus is a channel between the processor and one or more devices. For the - * purposes of the device model, all devices are connected via a bus, even if - * it is an internal, virtual, "platform" bus. Buses can plug into each other. - * A USB controller is usually a PCI device, for example. The device model - * represents the actual connections between buses and the devices they control. - * A bus is represented by the bus_type structure. It contains the name, the - * default attributes, the bus' methods, PM operations, and the driver core's - * private data. - */ -struct bus_type { - const char *name; - const char *dev_name; - struct device *dev_root; - const struct attribute_group **bus_groups; - const struct attribute_group **dev_groups; - const struct attribute_group **drv_groups; - - int (*match)(struct device *dev, struct device_driver *drv); - int (*uevent)(struct device *dev, struct kobj_uevent_env *env); - int (*probe)(struct device *dev); - void (*sync_state)(struct device *dev); - int (*remove)(struct device *dev); - void (*shutdown)(struct device *dev); - - int (*online)(struct device *dev); - int (*offline)(struct device *dev); - - int (*suspend)(struct device *dev, pm_message_t state); - int (*resume)(struct device *dev); - - int (*num_vf)(struct device *dev); - - int (*dma_configure)(struct device *dev); - - const struct dev_pm_ops *pm; - - const struct iommu_ops *iommu_ops; - - struct subsys_private *p; - struct lock_class_key lock_key; - - bool need_parent_lock; -}; - -extern int __must_check bus_register(struct bus_type *bus); - -extern void bus_unregister(struct bus_type *bus); - -extern int __must_check bus_rescan_devices(struct bus_type *bus); - -/* iterator helpers for buses */ -struct subsys_dev_iter { - struct klist_iter ki; - const struct device_type *type; -}; -void subsys_dev_iter_init(struct subsys_dev_iter *iter, - struct bus_type *subsys, - struct device *start, - const struct device_type *type); -struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter); -void subsys_dev_iter_exit(struct subsys_dev_iter *iter); - -int device_match_name(struct device *dev, const void *name); -int device_match_of_node(struct device *dev, const void *np); -int device_match_fwnode(struct device *dev, const void *fwnode); -int device_match_devt(struct device *dev, const void *pdevt); -int device_match_acpi_dev(struct device *dev, const void *adev); -int device_match_any(struct device *dev, const void *unused); - -int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data, - int (*fn)(struct device *dev, void *data)); -struct device *bus_find_device(struct bus_type *bus, struct device *start, - const void *data, - int (*match)(struct device *dev, const void *data)); -/** - * bus_find_device_by_name - device iterator for locating a particular device - * of a specific name. - * @bus: bus type - * @start: Device to begin with - * @name: name of the device to match - */ -static inline struct device *bus_find_device_by_name(struct bus_type *bus, - struct device *start, - const char *name) -{ - return bus_find_device(bus, start, name, device_match_name); -} - -/** - * bus_find_device_by_of_node : device iterator for locating a particular device - * matching the of_node. - * @bus: bus type - * @np: of_node of the device to match. - */ -static inline struct device * -bus_find_device_by_of_node(struct bus_type *bus, const struct device_node *np) -{ - return bus_find_device(bus, NULL, np, device_match_of_node); -} - -/** - * bus_find_device_by_fwnode : device iterator for locating a particular device - * matching the fwnode. - * @bus: bus type - * @fwnode: fwnode of the device to match. - */ -static inline struct device * -bus_find_device_by_fwnode(struct bus_type *bus, const struct fwnode_handle *fwnode) -{ - return bus_find_device(bus, NULL, fwnode, device_match_fwnode); -} - -/** - * bus_find_device_by_devt : device iterator for locating a particular device - * matching the device type. - * @bus: bus type - * @devt: device type of the device to match. - */ -static inline struct device *bus_find_device_by_devt(struct bus_type *bus, - dev_t devt) -{ - return bus_find_device(bus, NULL, &devt, device_match_devt); -} - -/** - * bus_find_next_device - Find the next device after a given device in a - * given bus. - * @bus: bus type - * @cur: device to begin the search with. - */ -static inline struct device * -bus_find_next_device(struct bus_type *bus,struct device *cur) -{ - return bus_find_device(bus, cur, NULL, device_match_any); -} - -#ifdef CONFIG_ACPI -struct acpi_device; - -/** - * bus_find_device_by_acpi_dev : device iterator for locating a particular device - * matching the ACPI COMPANION device. - * @bus: bus type - * @adev: ACPI COMPANION device to match. - */ -static inline struct device * -bus_find_device_by_acpi_dev(struct bus_type *bus, const struct acpi_device *adev) -{ - return bus_find_device(bus, NULL, adev, device_match_acpi_dev); -} -#else -static inline struct device * -bus_find_device_by_acpi_dev(struct bus_type *bus, const void *adev) -{ - return NULL; -} -#endif - -struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id, - struct device *hint); -int bus_for_each_drv(struct bus_type *bus, struct device_driver *start, - void *data, int (*fn)(struct device_driver *, void *)); -void bus_sort_breadthfirst(struct bus_type *bus, - int (*compare)(const struct device *a, - const struct device *b)); -/* - * Bus notifiers: Get notified of addition/removal of devices - * and binding/unbinding of drivers to devices. - * In the long run, it should be a replacement for the platform - * notify hooks. - */ -struct notifier_block; - -extern int bus_register_notifier(struct bus_type *bus, - struct notifier_block *nb); -extern int bus_unregister_notifier(struct bus_type *bus, - struct notifier_block *nb); - -/* All 4 notifers below get called with the target struct device * - * as an argument. Note that those functions are likely to be called - * with the device lock held in the core, so be careful. - */ -#define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */ -#define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device to be removed */ -#define BUS_NOTIFY_REMOVED_DEVICE 0x00000003 /* device removed */ -#define BUS_NOTIFY_BIND_DRIVER 0x00000004 /* driver about to be - bound */ -#define BUS_NOTIFY_BOUND_DRIVER 0x00000005 /* driver bound to device */ -#define BUS_NOTIFY_UNBIND_DRIVER 0x00000006 /* driver about to be - unbound */ -#define BUS_NOTIFY_UNBOUND_DRIVER 0x00000007 /* driver is unbound - from the device */ -#define BUS_NOTIFY_DRIVER_NOT_BOUND 0x00000008 /* driver fails to be bound */ - -extern struct kset *bus_get_kset(struct bus_type *bus); -extern struct klist *bus_get_device_klist(struct bus_type *bus); - -/** - * enum probe_type - device driver probe type to try - * Device drivers may opt in for special handling of their - * respective probe routines. This tells the core what to - * expect and prefer. - * - * @PROBE_DEFAULT_STRATEGY: Used by drivers that work equally well - * whether probed synchronously or asynchronously. - * @PROBE_PREFER_ASYNCHRONOUS: Drivers for "slow" devices which - * probing order is not essential for booting the system may - * opt into executing their probes asynchronously. - * @PROBE_FORCE_SYNCHRONOUS: Use this to annotate drivers that need - * their probe routines to run synchronously with driver and - * device registration (with the exception of -EPROBE_DEFER - * handling - re-probing always ends up being done asynchronously). - * - * Note that the end goal is to switch the kernel to use asynchronous - * probing by default, so annotating drivers with - * %PROBE_PREFER_ASYNCHRONOUS is a temporary measure that allows us - * to speed up boot process while we are validating the rest of the - * drivers. - */ -enum probe_type { - PROBE_DEFAULT_STRATEGY, - PROBE_PREFER_ASYNCHRONOUS, - PROBE_FORCE_SYNCHRONOUS, -}; - -/** - * struct device_driver - The basic device driver structure - * @name: Name of the device driver. - * @bus: The bus which the device of this driver belongs to. - * @owner: The module owner. - * @mod_name: Used for built-in modules. - * @suppress_bind_attrs: Disables bind/unbind via sysfs. - * @probe_type: Type of the probe (synchronous or asynchronous) to use. - * @of_match_table: The open firmware table. - * @acpi_match_table: The ACPI match table. - * @probe: Called to query the existence of a specific device, - * whether this driver can work with it, and bind the driver - * to a specific device. - * @sync_state: Called to sync device state to software state after all the - * state tracking consumers linked to this device (present at - * the time of late_initcall) have successfully bound to a - * driver. If the device has no consumers, this function will - * be called at late_initcall_sync level. If the device has - * consumers that are never bound to a driver, this function - * will never get called until they do. - * @remove: Called when the device is removed from the system to - * unbind a device from this driver. - * @shutdown: Called at shut-down time to quiesce the device. - * @suspend: Called to put the device to sleep mode. Usually to a - * low power state. - * @resume: Called to bring a device from sleep mode. - * @groups: Default attributes that get created by the driver core - * automatically. - * @dev_groups: Additional attributes attached to device instance once the - * it is bound to the driver. - * @pm: Power management operations of the device which matched - * this driver. - * @coredump: Called when sysfs entry is written to. The device driver - * is expected to call the dev_coredump API resulting in a - * uevent. - * @p: Driver core's private data, no one other than the driver - * core can touch this. - * - * The device driver-model tracks all of the drivers known to the system. - * The main reason for this tracking is to enable the driver core to match - * up drivers with new devices. Once drivers are known objects within the - * system, however, a number of other things become possible. Device drivers - * can export information and configuration variables that are independent - * of any specific device. - */ -struct device_driver { - const char *name; - struct bus_type *bus; - - struct module *owner; - const char *mod_name; /* used for built-in modules */ - - bool suppress_bind_attrs; /* disables bind/unbind via sysfs */ - enum probe_type probe_type; - - const struct of_device_id *of_match_table; - const struct acpi_device_id *acpi_match_table; - - int (*probe) (struct device *dev); - void (*sync_state)(struct device *dev); - int (*remove) (struct device *dev); - void (*shutdown) (struct device *dev); - int (*suspend) (struct device *dev, pm_message_t state); - int (*resume) (struct device *dev); - const struct attribute_group **groups; - const struct attribute_group **dev_groups; - - const struct dev_pm_ops *pm; - void (*coredump) (struct device *dev); - - struct driver_private *p; -}; - - -extern int __must_check driver_register(struct device_driver *drv); -extern void driver_unregister(struct device_driver *drv); - -extern struct device_driver *driver_find(const char *name, - struct bus_type *bus); -extern int driver_probe_done(void); -extern void wait_for_device_probe(void); - -/* sysfs interface for exporting driver attributes */ - -struct driver_attribute { - struct attribute attr; - ssize_t (*show)(struct device_driver *driver, char *buf); - ssize_t (*store)(struct device_driver *driver, const char *buf, - size_t count); -}; - -#define DRIVER_ATTR_RW(_name) \ - struct driver_attribute driver_attr_##_name = __ATTR_RW(_name) -#define DRIVER_ATTR_RO(_name) \ - struct driver_attribute driver_attr_##_name = __ATTR_RO(_name) -#define DRIVER_ATTR_WO(_name) \ - struct driver_attribute driver_attr_##_name = __ATTR_WO(_name) - -extern int __must_check driver_create_file(struct device_driver *driver, - const struct driver_attribute *attr); -extern void driver_remove_file(struct device_driver *driver, - const struct driver_attribute *attr); - -extern int __must_check driver_for_each_device(struct device_driver *drv, - struct device *start, - void *data, - int (*fn)(struct device *dev, - void *)); -struct device *driver_find_device(struct device_driver *drv, - struct device *start, const void *data, - int (*match)(struct device *dev, const void *data)); - -/** - * driver_find_device_by_name - device iterator for locating a particular device - * of a specific name. - * @drv: the driver we're iterating - * @name: name of the device to match - */ -static inline struct device *driver_find_device_by_name(struct device_driver *drv, - const char *name) -{ - return driver_find_device(drv, NULL, name, device_match_name); -} - -/** - * driver_find_device_by_of_node- device iterator for locating a particular device - * by of_node pointer. - * @drv: the driver we're iterating - * @np: of_node pointer to match. - */ -static inline struct device * -driver_find_device_by_of_node(struct device_driver *drv, - const struct device_node *np) -{ - return driver_find_device(drv, NULL, np, device_match_of_node); -} - -/** - * driver_find_device_by_fwnode- device iterator for locating a particular device - * by fwnode pointer. - * @drv: the driver we're iterating - * @fwnode: fwnode pointer to match. - */ -static inline struct device * -driver_find_device_by_fwnode(struct device_driver *drv, - const struct fwnode_handle *fwnode) -{ - return driver_find_device(drv, NULL, fwnode, device_match_fwnode); -} - -/** - * driver_find_device_by_devt- device iterator for locating a particular device - * by devt. - * @drv: the driver we're iterating - * @devt: devt pointer to match. - */ -static inline struct device *driver_find_device_by_devt(struct device_driver *drv, - dev_t devt) -{ - return driver_find_device(drv, NULL, &devt, device_match_devt); -} - -static inline struct device *driver_find_next_device(struct device_driver *drv, - struct device *start) -{ - return driver_find_device(drv, start, NULL, device_match_any); -} - -#ifdef CONFIG_ACPI -/** - * driver_find_device_by_acpi_dev : device iterator for locating a particular - * device matching the ACPI_COMPANION device. - * @drv: the driver we're iterating - * @adev: ACPI_COMPANION device to match. - */ -static inline struct device * -driver_find_device_by_acpi_dev(struct device_driver *drv, - const struct acpi_device *adev) -{ - return driver_find_device(drv, NULL, adev, device_match_acpi_dev); -} -#else -static inline struct device * -driver_find_device_by_acpi_dev(struct device_driver *drv, const void *adev) -{ - return NULL; -} -#endif - -void driver_deferred_probe_add(struct device *dev); -int driver_deferred_probe_check_state(struct device *dev); -int driver_deferred_probe_check_state_continue(struct device *dev); - /** * struct subsys_interface - interfaces to device functions * @name: name of the device function @@ -557,246 +75,6 @@ int subsys_system_register(struct bus_type *subsys, int subsys_virtual_register(struct bus_type *subsys, const struct attribute_group **groups); -/** - * struct class - device classes - * @name: Name of the class. - * @owner: The module owner. - * @class_groups: Default attributes of this class. - * @dev_groups: Default attributes of the devices that belong to the class. - * @dev_kobj: The kobject that represents this class and links it into the hierarchy. - * @dev_uevent: Called when a device is added, removed from this class, or a - * few other things that generate uevents to add the environment - * variables. - * @devnode: Callback to provide the devtmpfs. - * @class_release: Called to release this class. - * @dev_release: Called to release the device. - * @shutdown_pre: Called at shut-down time before driver shutdown. - * @ns_type: Callbacks so sysfs can detemine namespaces. - * @namespace: Namespace of the device belongs to this class. - * @get_ownership: Allows class to specify uid/gid of the sysfs directories - * for the devices belonging to the class. Usually tied to - * device's namespace. - * @pm: The default device power management operations of this class. - * @p: The private data of the driver core, no one other than the - * driver core can touch this. - * - * A class is a higher-level view of a device that abstracts out low-level - * implementation details. Drivers may see a SCSI disk or an ATA disk, but, - * at the class level, they are all simply disks. Classes allow user space - * to work with devices based on what they do, rather than how they are - * connected or how they work. - */ -struct class { - const char *name; - struct module *owner; - - const struct attribute_group **class_groups; - const struct attribute_group **dev_groups; - struct kobject *dev_kobj; - - int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env); - char *(*devnode)(struct device *dev, umode_t *mode); - - void (*class_release)(struct class *class); - void (*dev_release)(struct device *dev); - - int (*shutdown_pre)(struct device *dev); - - const struct kobj_ns_type_operations *ns_type; - const void *(*namespace)(struct device *dev); - - void (*get_ownership)(struct device *dev, kuid_t *uid, kgid_t *gid); - - const struct dev_pm_ops *pm; - - struct subsys_private *p; -}; - -struct class_dev_iter { - struct klist_iter ki; - const struct device_type *type; -}; - -extern struct kobject *sysfs_dev_block_kobj; -extern struct kobject *sysfs_dev_char_kobj; -extern int __must_check __class_register(struct class *class, - struct lock_class_key *key); -extern void class_unregister(struct class *class); - -/* This is a #define to keep the compiler from merging different - * instances of the __key variable */ -#define class_register(class) \ -({ \ - static struct lock_class_key __key; \ - __class_register(class, &__key); \ -}) - -struct class_compat; -struct class_compat *class_compat_register(const char *name); -void class_compat_unregister(struct class_compat *cls); -int class_compat_create_link(struct class_compat *cls, struct device *dev, - struct device *device_link); -void class_compat_remove_link(struct class_compat *cls, struct device *dev, - struct device *device_link); - -extern void class_dev_iter_init(struct class_dev_iter *iter, - struct class *class, - struct device *start, - const struct device_type *type); -extern struct device *class_dev_iter_next(struct class_dev_iter *iter); -extern void class_dev_iter_exit(struct class_dev_iter *iter); - -extern int class_for_each_device(struct class *class, struct device *start, - void *data, - int (*fn)(struct device *dev, void *data)); -extern struct device *class_find_device(struct class *class, - struct device *start, const void *data, - int (*match)(struct device *, const void *)); - -/** - * class_find_device_by_name - device iterator for locating a particular device - * of a specific name. - * @class: class type - * @name: name of the device to match - */ -static inline struct device *class_find_device_by_name(struct class *class, - const char *name) -{ - return class_find_device(class, NULL, name, device_match_name); -} - -/** - * class_find_device_by_of_node : device iterator for locating a particular device - * matching the of_node. - * @class: class type - * @np: of_node of the device to match. - */ -static inline struct device * -class_find_device_by_of_node(struct class *class, const struct device_node *np) -{ - return class_find_device(class, NULL, np, device_match_of_node); -} - -/** - * class_find_device_by_fwnode : device iterator for locating a particular device - * matching the fwnode. - * @class: class type - * @fwnode: fwnode of the device to match. - */ -static inline struct device * -class_find_device_by_fwnode(struct class *class, - const struct fwnode_handle *fwnode) -{ - return class_find_device(class, NULL, fwnode, device_match_fwnode); -} - -/** - * class_find_device_by_devt : device iterator for locating a particular device - * matching the device type. - * @class: class type - * @devt: device type of the device to match. - */ -static inline struct device *class_find_device_by_devt(struct class *class, - dev_t devt) -{ - return class_find_device(class, NULL, &devt, device_match_devt); -} - -#ifdef CONFIG_ACPI -struct acpi_device; -/** - * class_find_device_by_acpi_dev : device iterator for locating a particular - * device matching the ACPI_COMPANION device. - * @class: class type - * @adev: ACPI_COMPANION device to match. - */ -static inline struct device * -class_find_device_by_acpi_dev(struct class *class, const struct acpi_device *adev) -{ - return class_find_device(class, NULL, adev, device_match_acpi_dev); -} -#else -static inline struct device * -class_find_device_by_acpi_dev(struct class *class, const void *adev) -{ - return NULL; -} -#endif - -struct class_attribute { - struct attribute attr; - ssize_t (*show)(struct class *class, struct class_attribute *attr, - char *buf); - ssize_t (*store)(struct class *class, struct class_attribute *attr, - const char *buf, size_t count); -}; - -#define CLASS_ATTR_RW(_name) \ - struct class_attribute class_attr_##_name = __ATTR_RW(_name) -#define CLASS_ATTR_RO(_name) \ - struct class_attribute class_attr_##_name = __ATTR_RO(_name) -#define CLASS_ATTR_WO(_name) \ - struct class_attribute class_attr_##_name = __ATTR_WO(_name) - -extern int __must_check class_create_file_ns(struct class *class, - const struct class_attribute *attr, - const void *ns); -extern void class_remove_file_ns(struct class *class, - const struct class_attribute *attr, - const void *ns); - -static inline int __must_check class_create_file(struct class *class, - const struct class_attribute *attr) -{ - return class_create_file_ns(class, attr, NULL); -} - -static inline void class_remove_file(struct class *class, - const struct class_attribute *attr) -{ - return class_remove_file_ns(class, attr, NULL); -} - -/* Simple class attribute that is just a static string */ -struct class_attribute_string { - struct class_attribute attr; - char *str; -}; - -/* Currently read-only only */ -#define _CLASS_ATTR_STRING(_name, _mode, _str) \ - { __ATTR(_name, _mode, show_class_attr_string, NULL), _str } -#define CLASS_ATTR_STRING(_name, _mode, _str) \ - struct class_attribute_string class_attr_##_name = \ - _CLASS_ATTR_STRING(_name, _mode, _str) - -extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr, - char *buf); - -struct class_interface { - struct list_head node; - struct class *class; - - int (*add_dev) (struct device *, struct class_interface *); - void (*remove_dev) (struct device *, struct class_interface *); -}; - -extern int __must_check class_interface_register(struct class_interface *); -extern void class_interface_unregister(struct class_interface *); - -extern struct class * __must_check __class_create(struct module *owner, - const char *name, - struct lock_class_key *key); -extern void class_destroy(struct class *cls); - -/* This is a #define to keep the compiler from merging different - * instances of the __key variable */ -#define class_create(owner, name) \ -({ \ - static struct lock_class_key __key; \ - __class_create(owner, name, &__key); \ -}) - /* * The type of device, "struct device" is embedded in. A class * or bus can contain devices of different types @@ -1520,8 +798,6 @@ static inline struct device_node *dev_of_node(struct device *dev) return dev->of_node; } -void driver_init(void); - /* * High level routines for use by the bus drivers */ @@ -1664,12 +940,8 @@ extern void put_device(struct device *dev); extern bool kill_device(struct device *dev); #ifdef CONFIG_DEVTMPFS -extern int devtmpfs_create_node(struct device *dev); -extern int devtmpfs_delete_node(struct device *dev); extern int devtmpfs_mount(void); #else -static inline int devtmpfs_create_node(struct device *dev) { return 0; } -static inline int devtmpfs_delete_node(struct device *dev) { return 0; } static inline int devtmpfs_mount(void) { return 0; } #endif @@ -1687,221 +959,6 @@ void device_link_remove(void *consumer, struct device *supplier); void device_links_supplier_sync_state_pause(void); void device_links_supplier_sync_state_resume(void); -#ifndef dev_fmt -#define dev_fmt(fmt) fmt -#endif - -#ifdef CONFIG_PRINTK - -__printf(3, 0) __cold -int dev_vprintk_emit(int level, const struct device *dev, - const char *fmt, va_list args); -__printf(3, 4) __cold -int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...); - -__printf(3, 4) __cold -void dev_printk(const char *level, const struct device *dev, - const char *fmt, ...); -__printf(2, 3) __cold -void _dev_emerg(const struct device *dev, const char *fmt, ...); -__printf(2, 3) __cold -void _dev_alert(const struct device *dev, const char *fmt, ...); -__printf(2, 3) __cold -void _dev_crit(const struct device *dev, const char *fmt, ...); -__printf(2, 3) __cold -void _dev_err(const struct device *dev, const char *fmt, ...); -__printf(2, 3) __cold -void _dev_warn(const struct device *dev, const char *fmt, ...); -__printf(2, 3) __cold -void _dev_notice(const struct device *dev, const char *fmt, ...); -__printf(2, 3) __cold -void _dev_info(const struct device *dev, const char *fmt, ...); - -#else - -static inline __printf(3, 0) -int dev_vprintk_emit(int level, const struct device *dev, - const char *fmt, va_list args) -{ return 0; } -static inline __printf(3, 4) -int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) -{ return 0; } - -static inline void __dev_printk(const char *level, const struct device *dev, - struct va_format *vaf) -{} -static inline __printf(3, 4) -void dev_printk(const char *level, const struct device *dev, - const char *fmt, ...) -{} - -static inline __printf(2, 3) -void _dev_emerg(const struct device *dev, const char *fmt, ...) -{} -static inline __printf(2, 3) -void _dev_crit(const struct device *dev, const char *fmt, ...) -{} -static inline __printf(2, 3) -void _dev_alert(const struct device *dev, const char *fmt, ...) -{} -static inline __printf(2, 3) -void _dev_err(const struct device *dev, const char *fmt, ...) -{} -static inline __printf(2, 3) -void _dev_warn(const struct device *dev, const char *fmt, ...) -{} -static inline __printf(2, 3) -void _dev_notice(const struct device *dev, const char *fmt, ...) -{} -static inline __printf(2, 3) -void _dev_info(const struct device *dev, const char *fmt, ...) -{} - -#endif - -/* - * #defines for all the dev_<level> macros to prefix with whatever - * possible use of #define dev_fmt(fmt) ... - */ - -#define dev_emerg(dev, fmt, ...) \ - _dev_emerg(dev, dev_fmt(fmt), ##__VA_ARGS__) -#define dev_crit(dev, fmt, ...) \ - _dev_crit(dev, dev_fmt(fmt), ##__VA_ARGS__) -#define dev_alert(dev, fmt, ...) \ - _dev_alert(dev, dev_fmt(fmt), ##__VA_ARGS__) -#define dev_err(dev, fmt, ...) \ - _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__) -#define dev_warn(dev, fmt, ...) \ - _dev_warn(dev, dev_fmt(fmt), ##__VA_ARGS__) -#define dev_notice(dev, fmt, ...) \ - _dev_notice(dev, dev_fmt(fmt), ##__VA_ARGS__) -#define dev_info(dev, fmt, ...) \ - _dev_info(dev, dev_fmt(fmt), ##__VA_ARGS__) - -#if defined(CONFIG_DYNAMIC_DEBUG) -#define dev_dbg(dev, fmt, ...) \ - dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__) -#elif defined(DEBUG) -#define dev_dbg(dev, fmt, ...) \ - dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__) -#else -#define dev_dbg(dev, fmt, ...) \ -({ \ - if (0) \ - dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \ -}) -#endif - -#ifdef CONFIG_PRINTK -#define dev_level_once(dev_level, dev, fmt, ...) \ -do { \ - static bool __print_once __read_mostly; \ - \ - if (!__print_once) { \ - __print_once = true; \ - dev_level(dev, fmt, ##__VA_ARGS__); \ - } \ -} while (0) -#else -#define dev_level_once(dev_level, dev, fmt, ...) \ -do { \ - if (0) \ - dev_level(dev, fmt, ##__VA_ARGS__); \ -} while (0) -#endif - -#define dev_emerg_once(dev, fmt, ...) \ - dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__) -#define dev_alert_once(dev, fmt, ...) \ - dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__) -#define dev_crit_once(dev, fmt, ...) \ - dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__) -#define dev_err_once(dev, fmt, ...) \ - dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__) -#define dev_warn_once(dev, fmt, ...) \ - dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__) -#define dev_notice_once(dev, fmt, ...) \ - dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__) -#define dev_info_once(dev, fmt, ...) \ - dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__) -#define dev_dbg_once(dev, fmt, ...) \ - dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__) - -#define dev_level_ratelimited(dev_level, dev, fmt, ...) \ -do { \ - static DEFINE_RATELIMIT_STATE(_rs, \ - DEFAULT_RATELIMIT_INTERVAL, \ - DEFAULT_RATELIMIT_BURST); \ - if (__ratelimit(&_rs)) \ - dev_level(dev, fmt, ##__VA_ARGS__); \ -} while (0) - -#define dev_emerg_ratelimited(dev, fmt, ...) \ - dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__) -#define dev_alert_ratelimited(dev, fmt, ...) \ - dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__) -#define dev_crit_ratelimited(dev, fmt, ...) \ - dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__) -#define dev_err_ratelimited(dev, fmt, ...) \ - dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__) -#define dev_warn_ratelimited(dev, fmt, ...) \ - dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__) -#define dev_notice_ratelimited(dev, fmt, ...) \ - dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__) -#define dev_info_ratelimited(dev, fmt, ...) \ - dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__) -#if defined(CONFIG_DYNAMIC_DEBUG) -/* descriptor check is first to prevent flooding with "callbacks suppressed" */ -#define dev_dbg_ratelimited(dev, fmt, ...) \ -do { \ - static DEFINE_RATELIMIT_STATE(_rs, \ - DEFAULT_RATELIMIT_INTERVAL, \ - DEFAULT_RATELIMIT_BURST); \ - DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ - if (DYNAMIC_DEBUG_BRANCH(descriptor) && \ - __ratelimit(&_rs)) \ - __dynamic_dev_dbg(&descriptor, dev, dev_fmt(fmt), \ - ##__VA_ARGS__); \ -} while (0) -#elif defined(DEBUG) -#define dev_dbg_ratelimited(dev, fmt, ...) \ -do { \ - static DEFINE_RATELIMIT_STATE(_rs, \ - DEFAULT_RATELIMIT_INTERVAL, \ - DEFAULT_RATELIMIT_BURST); \ - if (__ratelimit(&_rs)) \ - dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \ -} while (0) -#else -#define dev_dbg_ratelimited(dev, fmt, ...) \ -do { \ - if (0) \ - dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \ -} while (0) -#endif - -#ifdef VERBOSE_DEBUG -#define dev_vdbg dev_dbg -#else -#define dev_vdbg(dev, fmt, ...) \ -({ \ - if (0) \ - dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \ -}) -#endif - -/* - * dev_WARN*() acts like dev_printk(), but with the key difference of - * using WARN/WARN_ONCE to include file/line information and a backtrace. - */ -#define dev_WARN(dev, format, arg...) \ - WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg); - -#define dev_WARN_ONCE(dev, condition, format, arg...) \ - WARN_ONCE(condition, "%s %s: " format, \ - dev_driver_string(dev), dev_name(dev), ## arg) - /* Create alias, so I can be autoloaded. */ #define MODULE_ALIAS_CHARDEV(major,minor) \ MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor)) @@ -1914,52 +971,4 @@ extern long sysfs_deprecated; #define sysfs_deprecated 0 #endif -/** - * module_driver() - Helper macro for drivers that don't do anything - * special in module init/exit. This eliminates a lot of boilerplate. - * Each module may only use this macro once, and calling it replaces - * module_init() and module_exit(). - * - * @__driver: driver name - * @__register: register function for this driver type - * @__unregister: unregister function for this driver type - * @...: Additional arguments to be passed to __register and __unregister. - * - * Use this macro to construct bus specific macros for registering - * drivers, and do not use it on its own. - */ -#define module_driver(__driver, __register, __unregister, ...) \ -static int __init __driver##_init(void) \ -{ \ - return __register(&(__driver) , ##__VA_ARGS__); \ -} \ -module_init(__driver##_init); \ -static void __exit __driver##_exit(void) \ -{ \ - __unregister(&(__driver) , ##__VA_ARGS__); \ -} \ -module_exit(__driver##_exit); - -/** - * builtin_driver() - Helper macro for drivers that don't do anything - * special in init and have no exit. This eliminates some boilerplate. - * Each driver may only use this macro once, and calling it replaces - * device_initcall (or in some cases, the legacy __initcall). This is - * meant to be a direct parallel of module_driver() above but without - * the __exit stuff that is not used for builtin cases. - * - * @__driver: driver name - * @__register: register function for this driver type - * @...: Additional arguments to be passed to __register - * - * Use this macro to construct bus specific macros for registering - * drivers, and do not use it on its own. - */ -#define builtin_driver(__driver, __register, ...) \ -static int __init __driver##_init(void) \ -{ \ - return __register(&(__driver) , ##__VA_ARGS__); \ -} \ -device_initcall(__driver##_init); - #endif /* _DEVICE_H_ */ diff --git a/include/linux/device/bus.h b/include/linux/device/bus.h new file mode 100644 index 000000000000..1ea5e1d1545b --- /dev/null +++ b/include/linux/device/bus.h @@ -0,0 +1,288 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * bus.h - the bus-specific portions of the driver model + * + * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org> + * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de> + * Copyright (c) 2008-2009 Novell Inc. + * Copyright (c) 2012-2019 Greg Kroah-Hartman <gregkh@linuxfoundation.org> + * Copyright (c) 2012-2019 Linux Foundation + * + * See Documentation/driver-api/driver-model/ for more information. + */ + +#ifndef _DEVICE_BUS_H_ +#define _DEVICE_BUS_H_ + +#include <linux/kobject.h> +#include <linux/klist.h> +#include <linux/pm.h> + +struct device_driver; +struct fwnode_handle; + +/** + * struct bus_type - The bus type of the device + * + * @name: The name of the bus. + * @dev_name: Used for subsystems to enumerate devices like ("foo%u", dev->id). + * @dev_root: Default device to use as the parent. + * @bus_groups: Default attributes of the bus. + * @dev_groups: Default attributes of the devices on the bus. + * @drv_groups: Default attributes of the device drivers on the bus. + * @match: Called, perhaps multiple times, whenever a new device or driver + * is added for this bus. It should return a positive value if the + * given device can be handled by the given driver and zero + * otherwise. It may also return error code if determining that + * the driver supports the device is not possible. In case of + * -EPROBE_DEFER it will queue the device for deferred probing. + * @uevent: Called when a device is added, removed, or a few other things + * that generate uevents to add the environment variables. + * @probe: Called when a new device or driver add to this bus, and callback + * the specific driver's probe to initial the matched device. + * @sync_state: Called to sync device state to software state after all the + * state tracking consumers linked to this device (present at + * the time of late_initcall) have successfully bound to a + * driver. If the device has no consumers, this function will + * be called at late_initcall_sync level. If the device has + * consumers that are never bound to a driver, this function + * will never get called until they do. + * @remove: Called when a device removed from this bus. + * @shutdown: Called at shut-down time to quiesce the device. + * + * @online: Called to put the device back online (after offlining it). + * @offline: Called to put the device offline for hot-removal. May fail. + * + * @suspend: Called when a device on this bus wants to go to sleep mode. + * @resume: Called to bring a device on this bus out of sleep mode. + * @num_vf: Called to find out how many virtual functions a device on this + * bus supports. + * @dma_configure: Called to setup DMA configuration on a device on + * this bus. + * @pm: Power management operations of this bus, callback the specific + * device driver's pm-ops. + * @iommu_ops: IOMMU specific operations for this bus, used to attach IOMMU + * driver implementations to a bus and allow the driver to do + * bus-specific setup + * @p: The private data of the driver core, only the driver core can + * touch this. + * @lock_key: Lock class key for use by the lock validator + * @need_parent_lock: When probing or removing a device on this bus, the + * device core should lock the device's parent. + * + * A bus is a channel between the processor and one or more devices. For the + * purposes of the device model, all devices are connected via a bus, even if + * it is an internal, virtual, "platform" bus. Buses can plug into each other. + * A USB controller is usually a PCI device, for example. The device model + * represents the actual connections between buses and the devices they control. + * A bus is represented by the bus_type structure. It contains the name, the + * default attributes, the bus' methods, PM operations, and the driver core's + * private data. + */ +struct bus_type { + const char *name; + const char *dev_name; + struct device *dev_root; + const struct attribute_group **bus_groups; + const struct attribute_group **dev_groups; + const struct attribute_group **drv_groups; + + int (*match)(struct device *dev, struct device_driver *drv); + int (*uevent)(struct device *dev, struct kobj_uevent_env *env); + int (*probe)(struct device *dev); + void (*sync_state)(struct device *dev); + int (*remove)(struct device *dev); + void (*shutdown)(struct device *dev); + + int (*online)(struct device *dev); + int (*offline)(struct device *dev); + + int (*suspend)(struct device *dev, pm_message_t state); + int (*resume)(struct device *dev); + + int (*num_vf)(struct device *dev); + + int (*dma_configure)(struct device *dev); + + const struct dev_pm_ops *pm; + + const struct iommu_ops *iommu_ops; + + struct subsys_private *p; + struct lock_class_key lock_key; + + bool need_parent_lock; +}; + +extern int __must_check bus_register(struct bus_type *bus); + +extern void bus_unregister(struct bus_type *bus); + +extern int __must_check bus_rescan_devices(struct bus_type *bus); + +struct bus_attribute { + struct attribute attr; + ssize_t (*show)(struct bus_type *bus, char *buf); + ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count); +}; + +#define BUS_ATTR_RW(_name) \ + struct bus_attribute bus_attr_##_name = __ATTR_RW(_name) +#define BUS_ATTR_RO(_name) \ + struct bus_attribute bus_attr_##_name = __ATTR_RO(_name) +#define BUS_ATTR_WO(_name) \ + struct bus_attribute bus_attr_##_name = __ATTR_WO(_name) + +extern int __must_check bus_create_file(struct bus_type *, + struct bus_attribute *); +extern void bus_remove_file(struct bus_type *, struct bus_attribute *); + +/* Generic device matching functions that all busses can use to match with */ +int device_match_name(struct device *dev, const void *name); +int device_match_of_node(struct device *dev, const void *np); +int device_match_fwnode(struct device *dev, const void *fwnode); +int device_match_devt(struct device *dev, const void *pdevt); +int device_match_acpi_dev(struct device *dev, const void *adev); +int device_match_any(struct device *dev, const void *unused); + +/* iterator helpers for buses */ +struct subsys_dev_iter { + struct klist_iter ki; + const struct device_type *type; +}; +void subsys_dev_iter_init(struct subsys_dev_iter *iter, + struct bus_type *subsys, + struct device *start, + const struct device_type *type); +struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter); +void subsys_dev_iter_exit(struct subsys_dev_iter *iter); + +int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data, + int (*fn)(struct device *dev, void *data)); +struct device *bus_find_device(struct bus_type *bus, struct device *start, + const void *data, + int (*match)(struct device *dev, const void *data)); +/** + * bus_find_device_by_name - device iterator for locating a particular device + * of a specific name. + * @bus: bus type + * @start: Device to begin with + * @name: name of the device to match + */ +static inline struct device *bus_find_device_by_name(struct bus_type *bus, + struct device *start, + const char *name) +{ + return bus_find_device(bus, start, name, device_match_name); +} + +/** + * bus_find_device_by_of_node : device iterator for locating a particular device + * matching the of_node. + * @bus: bus type + * @np: of_node of the device to match. + */ +static inline struct device * +bus_find_device_by_of_node(struct bus_type *bus, const struct device_node *np) +{ + return bus_find_device(bus, NULL, np, device_match_of_node); +} + +/** + * bus_find_device_by_fwnode : device iterator for locating a particular device + * matching the fwnode. + * @bus: bus type + * @fwnode: fwnode of the device to match. + */ +static inline struct device * +bus_find_device_by_fwnode(struct bus_type *bus, const struct fwnode_handle *fwnode) +{ + return bus_find_device(bus, NULL, fwnode, device_match_fwnode); +} + +/** + * bus_find_device_by_devt : device iterator for locating a particular device + * matching the device type. + * @bus: bus type + * @devt: device type of the device to match. + */ +static inline struct device *bus_find_device_by_devt(struct bus_type *bus, + dev_t devt) +{ + return bus_find_device(bus, NULL, &devt, device_match_devt); +} + +/** + * bus_find_next_device - Find the next device after a given device in a + * given bus. + * @bus: bus type + * @cur: device to begin the search with. + */ +static inline struct device * +bus_find_next_device(struct bus_type *bus,struct device *cur) +{ + return bus_find_device(bus, cur, NULL, device_match_any); +} + +#ifdef CONFIG_ACPI +struct acpi_device; + +/** + * bus_find_device_by_acpi_dev : device iterator for locating a particular device + * matching the ACPI COMPANION device. + * @bus: bus type + * @adev: ACPI COMPANION device to match. + */ +static inline struct device * +bus_find_device_by_acpi_dev(struct bus_type *bus, const struct acpi_device *adev) +{ + return bus_find_device(bus, NULL, adev, device_match_acpi_dev); +} +#else +static inline struct device * +bus_find_device_by_acpi_dev(struct bus_type *bus, const void *adev) +{ + return NULL; +} +#endif + +struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id, + struct device *hint); +int bus_for_each_drv(struct bus_type *bus, struct device_driver *start, + void *data, int (*fn)(struct device_driver *, void *)); +void bus_sort_breadthfirst(struct bus_type *bus, + int (*compare)(const struct device *a, + const struct device *b)); +/* + * Bus notifiers: Get notified of addition/removal of devices + * and binding/unbinding of drivers to devices. + * In the long run, it should be a replacement for the platform + * notify hooks. + */ +struct notifier_block; + +extern int bus_register_notifier(struct bus_type *bus, + struct notifier_block *nb); +extern int bus_unregister_notifier(struct bus_type *bus, + struct notifier_block *nb); + +/* All 4 notifers below get called with the target struct device * + * as an argument. Note that those functions are likely to be called + * with the device lock held in the core, so be careful. + */ +#define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */ +#define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device to be removed */ +#define BUS_NOTIFY_REMOVED_DEVICE 0x00000003 /* device removed */ +#define BUS_NOTIFY_BIND_DRIVER 0x00000004 /* driver about to be + bound */ +#define BUS_NOTIFY_BOUND_DRIVER 0x00000005 /* driver bound to device */ +#define BUS_NOTIFY_UNBIND_DRIVER 0x00000006 /* driver about to be + unbound */ +#define BUS_NOTIFY_UNBOUND_DRIVER 0x00000007 /* driver is unbound + from the device */ +#define BUS_NOTIFY_DRIVER_NOT_BOUND 0x00000008 /* driver fails to be bound */ + +extern struct kset *bus_get_kset(struct bus_type *bus); +extern struct klist *bus_get_device_klist(struct bus_type *bus); + +#endif diff --git a/include/linux/device/class.h b/include/linux/device/class.h new file mode 100644 index 000000000000..e8d470c457d1 --- /dev/null +++ b/include/linux/device/class.h @@ -0,0 +1,266 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * The class-specific portions of the driver model + * + * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org> + * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de> + * Copyright (c) 2008-2009 Novell Inc. + * Copyright (c) 2012-2019 Greg Kroah-Hartman <gregkh@linuxfoundation.org> + * Copyright (c) 2012-2019 Linux Foundation + * + * See Documentation/driver-api/driver-model/ for more information. + */ + +#ifndef _DEVICE_CLASS_H_ +#define _DEVICE_CLASS_H_ + +#include <linux/kobject.h> +#include <linux/klist.h> +#include <linux/pm.h> +#include <linux/device/bus.h> + +struct device; +struct fwnode_handle; + +/** + * struct class - device classes + * @name: Name of the class. + * @owner: The module owner. + * @class_groups: Default attributes of this class. + * @dev_groups: Default attributes of the devices that belong to the class. + * @dev_kobj: The kobject that represents this class and links it into the hierarchy. + * @dev_uevent: Called when a device is added, removed from this class, or a + * few other things that generate uevents to add the environment + * variables. + * @devnode: Callback to provide the devtmpfs. + * @class_release: Called to release this class. + * @dev_release: Called to release the device. + * @shutdown_pre: Called at shut-down time before driver shutdown. + * @ns_type: Callbacks so sysfs can detemine namespaces. + * @namespace: Namespace of the device belongs to this class. + * @get_ownership: Allows class to specify uid/gid of the sysfs directories + * for the devices belonging to the class. Usually tied to + * device's namespace. + * @pm: The default device power management operations of this class. + * @p: The private data of the driver core, no one other than the + * driver core can touch this. + * + * A class is a higher-level view of a device that abstracts out low-level + * implementation details. Drivers may see a SCSI disk or an ATA disk, but, + * at the class level, they are all simply disks. Classes allow user space + * to work with devices based on what they do, rather than how they are + * connected or how they work. + */ +struct class { + const char *name; + struct module *owner; + + const struct attribute_group **class_groups; + const struct attribute_group **dev_groups; + struct kobject *dev_kobj; + + int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env); + char *(*devnode)(struct device *dev, umode_t *mode); + + void (*class_release)(struct class *class); + void (*dev_release)(struct device *dev); + + int (*shutdown_pre)(struct device *dev); + + const struct kobj_ns_type_operations *ns_type; + const void *(*namespace)(struct device *dev); + + void (*get_ownership)(struct device *dev, kuid_t *uid, kgid_t *gid); + + const struct dev_pm_ops *pm; + + struct subsys_private *p; +}; + +struct class_dev_iter { + struct klist_iter ki; + const struct device_type *type; +}; + +extern struct kobject *sysfs_dev_block_kobj; +extern struct kobject *sysfs_dev_char_kobj; +extern int __must_check __class_register(struct class *class, + struct lock_class_key *key); +extern void class_unregister(struct class *class); + +/* This is a #define to keep the compiler from merging different + * instances of the __key variable */ +#define class_register(class) \ +({ \ + static struct lock_class_key __key; \ + __class_register(class, &__key); \ +}) + +struct class_compat; +struct class_compat *class_compat_register(const char *name); +void class_compat_unregister(struct class_compat *cls); +int class_compat_create_link(struct class_compat *cls, struct device *dev, + struct device *device_link); +void class_compat_remove_link(struct class_compat *cls, struct device *dev, + struct device *device_link); + +extern void class_dev_iter_init(struct class_dev_iter *iter, + struct class *class, + struct device *start, + const struct device_type *type); +extern struct device *class_dev_iter_next(struct class_dev_iter *iter); +extern void class_dev_iter_exit(struct class_dev_iter *iter); + +extern int class_for_each_device(struct class *class, struct device *start, + void *data, + int (*fn)(struct device *dev, void *data)); +extern struct device *class_find_device(struct class *class, + struct device *start, const void *data, + int (*match)(struct device *, const void *)); + +/** + * class_find_device_by_name - device iterator for locating a particular device + * of a specific name. + * @class: class type + * @name: name of the device to match + */ +static inline struct device *class_find_device_by_name(struct class *class, + const char *name) +{ + return class_find_device(class, NULL, name, device_match_name); +} + +/** + * class_find_device_by_of_node : device iterator for locating a particular device + * matching the of_node. + * @class: class type + * @np: of_node of the device to match. + */ +static inline struct device * +class_find_device_by_of_node(struct class *class, const struct device_node *np) +{ + return class_find_device(class, NULL, np, device_match_of_node); +} + +/** + * class_find_device_by_fwnode : device iterator for locating a particular device + * matching the fwnode. + * @class: class type + * @fwnode: fwnode of the device to match. + */ +static inline struct device * +class_find_device_by_fwnode(struct class *class, + const struct fwnode_handle *fwnode) +{ + return class_find_device(class, NULL, fwnode, device_match_fwnode); +} + +/** + * class_find_device_by_devt : device iterator for locating a particular device + * matching the device type. + * @class: class type + * @devt: device type of the device to match. + */ +static inline struct device *class_find_device_by_devt(struct class *class, + dev_t devt) +{ + return class_find_device(class, NULL, &devt, device_match_devt); +} + +#ifdef CONFIG_ACPI +struct acpi_device; +/** + * class_find_device_by_acpi_dev : device iterator for locating a particular + * device matching the ACPI_COMPANION device. + * @class: class type + * @adev: ACPI_COMPANION device to match. + */ +static inline struct device * +class_find_device_by_acpi_dev(struct class *class, const struct acpi_device *adev) +{ + return class_find_device(class, NULL, adev, device_match_acpi_dev); +} +#else +static inline struct device * +class_find_device_by_acpi_dev(struct class *class, const void *adev) +{ + return NULL; +} +#endif + +struct class_attribute { + struct attribute attr; + ssize_t (*show)(struct class *class, struct class_attribute *attr, + char *buf); + ssize_t (*store)(struct class *class, struct class_attribute *attr, + const char *buf, size_t count); +}; + +#define CLASS_ATTR_RW(_name) \ + struct class_attribute class_attr_##_name = __ATTR_RW(_name) +#define CLASS_ATTR_RO(_name) \ + struct class_attribute class_attr_##_name = __ATTR_RO(_name) +#define CLASS_ATTR_WO(_name) \ + struct class_attribute class_attr_##_name = __ATTR_WO(_name) + +extern int __must_check class_create_file_ns(struct class *class, + const struct class_attribute *attr, + const void *ns); +extern void class_remove_file_ns(struct class *class, + const struct class_attribute *attr, + const void *ns); + +static inline int __must_check class_create_file(struct class *class, + const struct class_attribute *attr) +{ + return class_create_file_ns(class, attr, NULL); +} + +static inline void class_remove_file(struct class *class, + const struct class_attribute *attr) +{ + return class_remove_file_ns(class, attr, NULL); +} + +/* Simple class attribute that is just a static string */ +struct class_attribute_string { + struct class_attribute attr; + char *str; +}; + +/* Currently read-only only */ +#define _CLASS_ATTR_STRING(_name, _mode, _str) \ + { __ATTR(_name, _mode, show_class_attr_string, NULL), _str } +#define CLASS_ATTR_STRING(_name, _mode, _str) \ + struct class_attribute_string class_attr_##_name = \ + _CLASS_ATTR_STRING(_name, _mode, _str) + +extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr, + char *buf); + +struct class_interface { + struct list_head node; + struct class *class; + + int (*add_dev) (struct device *, struct class_interface *); + void (*remove_dev) (struct device *, struct class_interface *); +}; + +extern int __must_check class_interface_register(struct class_interface *); +extern void class_interface_unregister(struct class_interface *); + +extern struct class * __must_check __class_create(struct module *owner, + const char *name, + struct lock_class_key *key); +extern void class_destroy(struct class *cls); + +/* This is a #define to keep the compiler from merging different + * instances of the __key variable */ +#define class_create(owner, name) \ +({ \ + static struct lock_class_key __key; \ + __class_create(owner, name, &__key); \ +}) + + +#endif /* _DEVICE_CLASS_H_ */ diff --git a/include/linux/device/driver.h b/include/linux/device/driver.h new file mode 100644 index 000000000000..1188260f9a02 --- /dev/null +++ b/include/linux/device/driver.h @@ -0,0 +1,292 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * The driver-specific portions of the driver model + * + * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org> + * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de> + * Copyright (c) 2008-2009 Novell Inc. + * Copyright (c) 2012-2019 Greg Kroah-Hartman <gregkh@linuxfoundation.org> + * Copyright (c) 2012-2019 Linux Foundation + * + * See Documentation/driver-api/driver-model/ for more information. + */ + +#ifndef _DEVICE_DRIVER_H_ +#define _DEVICE_DRIVER_H_ + +#include <linux/kobject.h> +#include <linux/klist.h> +#include <linux/pm.h> +#include <linux/device/bus.h> + +/** + * enum probe_type - device driver probe type to try + * Device drivers may opt in for special handling of their + * respective probe routines. This tells the core what to + * expect and prefer. + * + * @PROBE_DEFAULT_STRATEGY: Used by drivers that work equally well + * whether probed synchronously or asynchronously. + * @PROBE_PREFER_ASYNCHRONOUS: Drivers for "slow" devices which + * probing order is not essential for booting the system may + * opt into executing their probes asynchronously. + * @PROBE_FORCE_SYNCHRONOUS: Use this to annotate drivers that need + * their probe routines to run synchronously with driver and + * device registration (with the exception of -EPROBE_DEFER + * handling - re-probing always ends up being done asynchronously). + * + * Note that the end goal is to switch the kernel to use asynchronous + * probing by default, so annotating drivers with + * %PROBE_PREFER_ASYNCHRONOUS is a temporary measure that allows us + * to speed up boot process while we are validating the rest of the + * drivers. + */ +enum probe_type { + PROBE_DEFAULT_STRATEGY, + PROBE_PREFER_ASYNCHRONOUS, + PROBE_FORCE_SYNCHRONOUS, +}; + +/** + * struct device_driver - The basic device driver structure + * @name: Name of the device driver. + * @bus: The bus which the device of this driver belongs to. + * @owner: The module owner. + * @mod_name: Used for built-in modules. + * @suppress_bind_attrs: Disables bind/unbind via sysfs. + * @probe_type: Type of the probe (synchronous or asynchronous) to use. + * @of_match_table: The open firmware table. + * @acpi_match_table: The ACPI match table. + * @probe: Called to query the existence of a specific device, + * whether this driver can work with it, and bind the driver + * to a specific device. + * @sync_state: Called to sync device state to software state after all the + * state tracking consumers linked to this device (present at + * the time of late_initcall) have successfully bound to a + * driver. If the device has no consumers, this function will + * be called at late_initcall_sync level. If the device has + * consumers that are never bound to a driver, this function + * will never get called until they do. + * @remove: Called when the device is removed from the system to + * unbind a device from this driver. + * @shutdown: Called at shut-down time to quiesce the device. + * @suspend: Called to put the device to sleep mode. Usually to a + * low power state. + * @resume: Called to bring a device from sleep mode. + * @groups: Default attributes that get created by the driver core + * automatically. + * @dev_groups: Additional attributes attached to device instance once the + * it is bound to the driver. + * @pm: Power management operations of the device which matched + * this driver. + * @coredump: Called when sysfs entry is written to. The device driver + * is expected to call the dev_coredump API resulting in a + * uevent. + * @p: Driver core's private data, no one other than the driver + * core can touch this. + * + * The device driver-model tracks all of the drivers known to the system. + * The main reason for this tracking is to enable the driver core to match + * up drivers with new devices. Once drivers are known objects within the + * system, however, a number of other things become possible. Device drivers + * can export information and configuration variables that are independent + * of any specific device. + */ +struct device_driver { + const char *name; + struct bus_type *bus; + + struct module *owner; + const char *mod_name; /* used for built-in modules */ + + bool suppress_bind_attrs; /* disables bind/unbind via sysfs */ + enum probe_type probe_type; + + const struct of_device_id *of_match_table; + const struct acpi_device_id *acpi_match_table; + + int (*probe) (struct device *dev); + void (*sync_state)(struct device *dev); + int (*remove) (struct device *dev); + void (*shutdown) (struct device *dev); + int (*suspend) (struct device *dev, pm_message_t state); + int (*resume) (struct device *dev); + const struct attribute_group **groups; + const struct attribute_group **dev_groups; + + const struct dev_pm_ops *pm; + void (*coredump) (struct device *dev); + + struct driver_private *p; +}; + + +extern int __must_check driver_register(struct device_driver *drv); +extern void driver_unregister(struct device_driver *drv); + +extern struct device_driver *driver_find(const char *name, + struct bus_type *bus); +extern int driver_probe_done(void); +extern void wait_for_device_probe(void); + +/* sysfs interface for exporting driver attributes */ + +struct driver_attribute { + struct attribute attr; + ssize_t (*show)(struct device_driver *driver, char *buf); + ssize_t (*store)(struct device_driver *driver, const char *buf, + size_t count); +}; + +#define DRIVER_ATTR_RW(_name) \ + struct driver_attribute driver_attr_##_name = __ATTR_RW(_name) +#define DRIVER_ATTR_RO(_name) \ + struct driver_attribute driver_attr_##_name = __ATTR_RO(_name) +#define DRIVER_ATTR_WO(_name) \ + struct driver_attribute driver_attr_##_name = __ATTR_WO(_name) + +extern int __must_check driver_create_file(struct device_driver *driver, + const struct driver_attribute *attr); +extern void driver_remove_file(struct device_driver *driver, + const struct driver_attribute *attr); + +extern int __must_check driver_for_each_device(struct device_driver *drv, + struct device *start, + void *data, + int (*fn)(struct device *dev, + void *)); +struct device *driver_find_device(struct device_driver *drv, + struct device *start, const void *data, + int (*match)(struct device *dev, const void *data)); + +/** + * driver_find_device_by_name - device iterator for locating a particular device + * of a specific name. + * @drv: the driver we're iterating + * @name: name of the device to match + */ +static inline struct device *driver_find_device_by_name(struct device_driver *drv, + const char *name) +{ + return driver_find_device(drv, NULL, name, device_match_name); +} + +/** + * driver_find_device_by_of_node- device iterator for locating a particular device + * by of_node pointer. + * @drv: the driver we're iterating + * @np: of_node pointer to match. + */ +static inline struct device * +driver_find_device_by_of_node(struct device_driver *drv, + const struct device_node *np) +{ + return driver_find_device(drv, NULL, np, device_match_of_node); +} + +/** + * driver_find_device_by_fwnode- device iterator for locating a particular device + * by fwnode pointer. + * @drv: the driver we're iterating + * @fwnode: fwnode pointer to match. + */ +static inline struct device * +driver_find_device_by_fwnode(struct device_driver *drv, + const struct fwnode_handle *fwnode) +{ + return driver_find_device(drv, NULL, fwnode, device_match_fwnode); +} + +/** + * driver_find_device_by_devt- device iterator for locating a particular device + * by devt. + * @drv: the driver we're iterating + * @devt: devt pointer to match. + */ +static inline struct device *driver_find_device_by_devt(struct device_driver *drv, + dev_t devt) +{ + return driver_find_device(drv, NULL, &devt, device_match_devt); +} + +static inline struct device *driver_find_next_device(struct device_driver *drv, + struct device *start) +{ + return driver_find_device(drv, start, NULL, device_match_any); +} + +#ifdef CONFIG_ACPI +/** + * driver_find_device_by_acpi_dev : device iterator for locating a particular + * device matching the ACPI_COMPANION device. + * @drv: the driver we're iterating + * @adev: ACPI_COMPANION device to match. + */ +static inline struct device * +driver_find_device_by_acpi_dev(struct device_driver *drv, + const struct acpi_device *adev) +{ + return driver_find_device(drv, NULL, adev, device_match_acpi_dev); +} +#else +static inline struct device * +driver_find_device_by_acpi_dev(struct device_driver *drv, const void *adev) +{ + return NULL; +} +#endif + +void driver_deferred_probe_add(struct device *dev); +int driver_deferred_probe_check_state(struct device *dev); +int driver_deferred_probe_check_state_continue(struct device *dev); +void driver_init(void); + +/** + * module_driver() - Helper macro for drivers that don't do anything + * special in module init/exit. This eliminates a lot of boilerplate. + * Each module may only use this macro once, and calling it replaces + * module_init() and module_exit(). + * + * @__driver: driver name + * @__register: register function for this driver type + * @__unregister: unregister function for this driver type + * @...: Additional arguments to be passed to __register and __unregister. + * + * Use this macro to construct bus specific macros for registering + * drivers, and do not use it on its own. + */ +#define module_driver(__driver, __register, __unregister, ...) \ +static int __init __driver##_init(void) \ +{ \ + return __register(&(__driver) , ##__VA_ARGS__); \ +} \ +module_init(__driver##_init); \ +static void __exit __driver##_exit(void) \ +{ \ + __unregister(&(__driver) , ##__VA_ARGS__); \ +} \ +module_exit(__driver##_exit); + +/** + * builtin_driver() - Helper macro for drivers that don't do anything + * special in init and have no exit. This eliminates some boilerplate. + * Each driver may only use this macro once, and calling it replaces + * device_initcall (or in some cases, the legacy __initcall). This is + * meant to be a direct parallel of module_driver() above but without + * the __exit stuff that is not used for builtin cases. + * + * @__driver: driver name + * @__register: register function for this driver type + * @...: Additional arguments to be passed to __register + * + * Use this macro to construct bus specific macros for registering + * drivers, and do not use it on its own. + */ +#define builtin_driver(__driver, __register, ...) \ +static int __init __driver##_init(void) \ +{ \ + return __register(&(__driver) , ##__VA_ARGS__); \ +} \ +device_initcall(__driver##_init); + +#endif /* _DEVICE_DRIVER_H_ */ diff --git a/init/main.c b/init/main.c index da1bc0b60a7d..db13a76c036e 100644 --- a/init/main.c +++ b/init/main.c @@ -63,7 +63,7 @@ #include <linux/lockdep.h> #include <linux/kmemleak.h> #include <linux/pid_namespace.h> -#include <linux/device.h> +#include <linux/device/driver.h> #include <linux/kthread.h> #include <linux/sched.h> #include <linux/sched/init.h> |