Greg Kroah-Hartman | 989d42e | 2017-11-07 17:30:07 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 2 | /* |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 3 | * drivers/base/dd.c - The core device/driver interactions. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 4 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 5 | * This file contains the (sometimes tricky) code that controls the |
| 6 | * interactions between devices and drivers, which primarily includes |
| 7 | * driver binding and unbinding. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 8 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 9 | * All of this code used to exist in drivers/base/bus.c, but was |
| 10 | * relocated to here in the name of compartmentalization (since it wasn't |
| 11 | * strictly code just for the 'struct bus_type'. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 12 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 13 | * Copyright (c) 2002-5 Patrick Mochel |
| 14 | * Copyright (c) 2002-3 Open Source Development Labs |
Greg Kroah-Hartman | b402843 | 2009-05-11 14:16:57 -0700 | [diff] [blame] | 15 | * Copyright (c) 2007-2009 Greg Kroah-Hartman <gregkh@suse.de> |
| 16 | * Copyright (c) 2007-2009 Novell Inc. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 17 | */ |
| 18 | |
Javier Martinez Canillas | 28af109a | 2018-07-08 15:34:59 +0200 | [diff] [blame] | 19 | #include <linux/debugfs.h> |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 20 | #include <linux/device.h> |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 21 | #include <linux/delay.h> |
Christoph Hellwig | 0a0f0d8 | 2020-09-22 15:31:03 +0200 | [diff] [blame] | 22 | #include <linux/dma-map-ops.h> |
Todd Poynor | 1f5000b | 2017-07-25 16:31:59 -0700 | [diff] [blame] | 23 | #include <linux/init.h> |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 24 | #include <linux/module.h> |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 25 | #include <linux/kthread.h> |
Andrew Morton | 735a7ff | 2006-10-27 11:42:37 -0700 | [diff] [blame] | 26 | #include <linux/wait.h> |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 27 | #include <linux/async.h> |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 28 | #include <linux/pm_runtime.h> |
Linus Walleij | ab78029 | 2013-01-22 10:56:14 -0700 | [diff] [blame] | 29 | #include <linux/pinctrl/devinfo.h> |
Andrzej Hajda | d090b70 | 2020-07-13 16:43:22 +0200 | [diff] [blame] | 30 | #include <linux/slab.h> |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 31 | |
| 32 | #include "base.h" |
| 33 | #include "power/power.h" |
| 34 | |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 35 | /* |
| 36 | * Deferred Probe infrastructure. |
| 37 | * |
| 38 | * Sometimes driver probe order matters, but the kernel doesn't always have |
| 39 | * dependency information which means some drivers will get probed before a |
| 40 | * resource it depends on is available. For example, an SDHCI driver may |
| 41 | * first need a GPIO line from an i2c GPIO controller before it can be |
| 42 | * initialized. If a required resource is not available yet, a driver can |
| 43 | * request probing to be deferred by returning -EPROBE_DEFER from its probe hook |
| 44 | * |
| 45 | * Deferred probe maintains two lists of devices, a pending list and an active |
| 46 | * list. A driver returning -EPROBE_DEFER causes the device to be added to the |
| 47 | * pending list. A successful driver probe will trigger moving all devices |
| 48 | * from the pending to the active list so that the workqueue will eventually |
| 49 | * retry them. |
| 50 | * |
| 51 | * The deferred_probe_mutex must be held any time the deferred_probe_*_list |
Greg Kroah-Hartman | ef8a3fd | 2012-03-08 12:17:22 -0800 | [diff] [blame] | 52 | * of the (struct device*)->p->deferred_probe pointers are manipulated |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 53 | */ |
| 54 | static DEFINE_MUTEX(deferred_probe_mutex); |
| 55 | static LIST_HEAD(deferred_probe_pending_list); |
| 56 | static LIST_HEAD(deferred_probe_active_list); |
Grant Likely | 58b116b | 2014-04-29 12:05:22 +0100 | [diff] [blame] | 57 | static atomic_t deferred_trigger_count = ATOMIC_INIT(0); |
Rob Herring | 25b4e70 | 2018-07-09 09:41:48 -0600 | [diff] [blame] | 58 | static bool initcalls_done; |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 59 | |
Feng Tang | 1ea61b6 | 2019-02-13 15:47:36 +0800 | [diff] [blame] | 60 | /* Save the async probe drivers' name from kernel cmdline */ |
| 61 | #define ASYNC_DRV_NAMES_MAX_LEN 256 |
| 62 | static char async_probe_drv_names[ASYNC_DRV_NAMES_MAX_LEN]; |
Saravana Kannan | f79f662e | 2022-05-03 17:53:43 -0700 | [diff] [blame] | 63 | static bool async_probe_default; |
Feng Tang | 1ea61b6 | 2019-02-13 15:47:36 +0800 | [diff] [blame] | 64 | |
Thierry Reding | 4157533 | 2014-08-08 15:56:36 +0200 | [diff] [blame] | 65 | /* |
Strashko, Grygorii | 013c074 | 2015-11-10 11:42:34 +0200 | [diff] [blame] | 66 | * In some cases, like suspend to RAM or hibernation, It might be reasonable |
| 67 | * to prohibit probing of devices as it could be unsafe. |
| 68 | * Once defer_all_probes is true all drivers probes will be forcibly deferred. |
| 69 | */ |
| 70 | static bool defer_all_probes; |
| 71 | |
Ahmad Fatoum | 72a91f1 | 2021-03-23 16:37:13 +0100 | [diff] [blame] | 72 | static void __device_set_deferred_probe_reason(const struct device *dev, char *reason) |
| 73 | { |
| 74 | kfree(dev->p->deferred_probe_reason); |
| 75 | dev->p->deferred_probe_reason = reason; |
| 76 | } |
| 77 | |
Strashko, Grygorii | 013c074 | 2015-11-10 11:42:34 +0200 | [diff] [blame] | 78 | /* |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 79 | * deferred_probe_work_func() - Retry probing devices in the active list. |
| 80 | */ |
| 81 | static void deferred_probe_work_func(struct work_struct *work) |
| 82 | { |
| 83 | struct device *dev; |
Greg Kroah-Hartman | ef8a3fd | 2012-03-08 12:17:22 -0800 | [diff] [blame] | 84 | struct device_private *private; |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 85 | /* |
| 86 | * This block processes every device in the deferred 'active' list. |
| 87 | * Each device is removed from the active list and passed to |
| 88 | * bus_probe_device() to re-attempt the probe. The loop continues |
| 89 | * until every device in the active list is removed and retried. |
| 90 | * |
| 91 | * Note: Once the device is removed from the list and the mutex is |
| 92 | * released, it is possible for the device get freed by another thread |
| 93 | * and cause a illegal pointer dereference. This code uses |
| 94 | * get/put_device() to ensure the device structure cannot disappear |
| 95 | * from under our feet. |
| 96 | */ |
| 97 | mutex_lock(&deferred_probe_mutex); |
| 98 | while (!list_empty(&deferred_probe_active_list)) { |
Greg Kroah-Hartman | ef8a3fd | 2012-03-08 12:17:22 -0800 | [diff] [blame] | 99 | private = list_first_entry(&deferred_probe_active_list, |
| 100 | typeof(*dev->p), deferred_probe); |
| 101 | dev = private->device; |
| 102 | list_del_init(&private->deferred_probe); |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 103 | |
| 104 | get_device(dev); |
| 105 | |
Ahmad Fatoum | 72a91f1 | 2021-03-23 16:37:13 +0100 | [diff] [blame] | 106 | __device_set_deferred_probe_reason(dev, NULL); |
Ahmad Fatoum | f0acf63 | 2021-03-19 12:04:57 +0100 | [diff] [blame] | 107 | |
Greg Kroah-Hartman | 8b0372a | 2012-03-08 12:20:37 -0800 | [diff] [blame] | 108 | /* |
| 109 | * Drop the mutex while probing each device; the probe path may |
| 110 | * manipulate the deferred list |
| 111 | */ |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 112 | mutex_unlock(&deferred_probe_mutex); |
Mark Brown | 8153584 | 2012-07-05 14:04:44 +0100 | [diff] [blame] | 113 | |
| 114 | /* |
| 115 | * Force the device to the end of the dpm_list since |
| 116 | * the PM code assumes that the order we add things to |
| 117 | * the list is a good order for suspend but deferred |
| 118 | * probe makes that very unsafe. |
| 119 | */ |
Feng Kan | 494fd7b | 2018-04-10 16:57:06 -0700 | [diff] [blame] | 120 | device_pm_move_to_tail(dev); |
Mark Brown | 8153584 | 2012-07-05 14:04:44 +0100 | [diff] [blame] | 121 | |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 122 | dev_dbg(dev, "Retrying from deferred list\n"); |
Todd Poynor | 0a50f61 | 2018-06-20 17:35:56 -0700 | [diff] [blame] | 123 | bus_probe_device(dev); |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 124 | mutex_lock(&deferred_probe_mutex); |
| 125 | |
| 126 | put_device(dev); |
| 127 | } |
| 128 | mutex_unlock(&deferred_probe_mutex); |
| 129 | } |
| 130 | static DECLARE_WORK(deferred_probe_work, deferred_probe_work_func); |
| 131 | |
Rafael J. Wysocki | e7dd401 | 2019-02-01 01:59:42 +0100 | [diff] [blame] | 132 | void driver_deferred_probe_add(struct device *dev) |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 133 | { |
Saravana Kannan | f2db85b | 2021-03-02 13:11:30 -0800 | [diff] [blame] | 134 | if (!dev->can_match) |
| 135 | return; |
| 136 | |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 137 | mutex_lock(&deferred_probe_mutex); |
Greg Kroah-Hartman | ef8a3fd | 2012-03-08 12:17:22 -0800 | [diff] [blame] | 138 | if (list_empty(&dev->p->deferred_probe)) { |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 139 | dev_dbg(dev, "Added to deferred list\n"); |
Kuninori Morimoto | 1d29cfa | 2012-05-29 18:46:06 -0700 | [diff] [blame] | 140 | list_add_tail(&dev->p->deferred_probe, &deferred_probe_pending_list); |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 141 | } |
| 142 | mutex_unlock(&deferred_probe_mutex); |
| 143 | } |
| 144 | |
| 145 | void driver_deferred_probe_del(struct device *dev) |
| 146 | { |
| 147 | mutex_lock(&deferred_probe_mutex); |
Greg Kroah-Hartman | ef8a3fd | 2012-03-08 12:17:22 -0800 | [diff] [blame] | 148 | if (!list_empty(&dev->p->deferred_probe)) { |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 149 | dev_dbg(dev, "Removed from deferred list\n"); |
Greg Kroah-Hartman | ef8a3fd | 2012-03-08 12:17:22 -0800 | [diff] [blame] | 150 | list_del_init(&dev->p->deferred_probe); |
Ahmad Fatoum | 72a91f1 | 2021-03-23 16:37:13 +0100 | [diff] [blame] | 151 | __device_set_deferred_probe_reason(dev, NULL); |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 152 | } |
| 153 | mutex_unlock(&deferred_probe_mutex); |
| 154 | } |
| 155 | |
lizhe | 9015813 | 2022-03-09 05:54:18 -0800 | [diff] [blame] | 156 | static bool driver_deferred_probe_enable; |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 157 | /** |
| 158 | * driver_deferred_probe_trigger() - Kick off re-probing deferred devices |
| 159 | * |
| 160 | * This functions moves all devices from the pending list to the active |
| 161 | * list and schedules the deferred probe workqueue to process them. It |
| 162 | * should be called anytime a driver is successfully bound to a device. |
Grant Likely | 58b116b | 2014-04-29 12:05:22 +0100 | [diff] [blame] | 163 | * |
| 164 | * Note, there is a race condition in multi-threaded probe. In the case where |
| 165 | * more than one device is probing at the same time, it is possible for one |
| 166 | * probe to complete successfully while another is about to defer. If the second |
| 167 | * depends on the first, then it will get put on the pending list after the |
Shailendra Verma | 9ba8af6 | 2015-05-25 23:46:11 +0530 | [diff] [blame] | 168 | * trigger event has already occurred and will be stuck there. |
Grant Likely | 58b116b | 2014-04-29 12:05:22 +0100 | [diff] [blame] | 169 | * |
| 170 | * The atomic 'deferred_trigger_count' is used to determine if a successful |
| 171 | * trigger has occurred in the midst of probing a driver. If the trigger count |
| 172 | * changes in the midst of a probe, then deferred processing should be triggered |
| 173 | * again. |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 174 | */ |
Saravana Kannan | 2f8c3ae | 2022-06-01 00:07:00 -0700 | [diff] [blame] | 175 | void driver_deferred_probe_trigger(void) |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 176 | { |
| 177 | if (!driver_deferred_probe_enable) |
| 178 | return; |
| 179 | |
Greg Kroah-Hartman | 8b0372a | 2012-03-08 12:20:37 -0800 | [diff] [blame] | 180 | /* |
| 181 | * A successful probe means that all the devices in the pending list |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 182 | * should be triggered to be reprobed. Move all the deferred devices |
Greg Kroah-Hartman | 8b0372a | 2012-03-08 12:20:37 -0800 | [diff] [blame] | 183 | * into the active list so they can be retried by the workqueue |
| 184 | */ |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 185 | mutex_lock(&deferred_probe_mutex); |
Grant Likely | 58b116b | 2014-04-29 12:05:22 +0100 | [diff] [blame] | 186 | atomic_inc(&deferred_trigger_count); |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 187 | list_splice_tail_init(&deferred_probe_pending_list, |
| 188 | &deferred_probe_active_list); |
| 189 | mutex_unlock(&deferred_probe_mutex); |
| 190 | |
Greg Kroah-Hartman | 8b0372a | 2012-03-08 12:20:37 -0800 | [diff] [blame] | 191 | /* |
| 192 | * Kick the re-probe thread. It may already be scheduled, but it is |
| 193 | * safe to kick it again. |
| 194 | */ |
Yogesh Lal | e611f8c | 2021-03-24 16:31:38 +0530 | [diff] [blame] | 195 | queue_work(system_unbound_wq, &deferred_probe_work); |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 196 | } |
| 197 | |
| 198 | /** |
Randy Dunlap | dbf03d656 | 2018-11-05 23:41:27 -0800 | [diff] [blame] | 199 | * device_block_probing() - Block/defer device's probes |
Strashko, Grygorii | 013c074 | 2015-11-10 11:42:34 +0200 | [diff] [blame] | 200 | * |
| 201 | * It will disable probing of devices and defer their probes instead. |
| 202 | */ |
| 203 | void device_block_probing(void) |
| 204 | { |
| 205 | defer_all_probes = true; |
| 206 | /* sync with probes to avoid races. */ |
| 207 | wait_for_device_probe(); |
| 208 | } |
| 209 | |
| 210 | /** |
| 211 | * device_unblock_probing() - Unblock/enable device's probes |
| 212 | * |
| 213 | * It will restore normal behavior and trigger re-probing of deferred |
| 214 | * devices. |
| 215 | */ |
| 216 | void device_unblock_probing(void) |
| 217 | { |
| 218 | defer_all_probes = false; |
| 219 | driver_deferred_probe_trigger(); |
| 220 | } |
| 221 | |
Andrzej Hajda | d090b70 | 2020-07-13 16:43:22 +0200 | [diff] [blame] | 222 | /** |
| 223 | * device_set_deferred_probe_reason() - Set defer probe reason message for device |
| 224 | * @dev: the pointer to the struct device |
| 225 | * @vaf: the pointer to va_format structure with message |
| 226 | */ |
| 227 | void device_set_deferred_probe_reason(const struct device *dev, struct va_format *vaf) |
| 228 | { |
| 229 | const char *drv = dev_driver_string(dev); |
Ahmad Fatoum | 72a91f1 | 2021-03-23 16:37:13 +0100 | [diff] [blame] | 230 | char *reason; |
Andrzej Hajda | d090b70 | 2020-07-13 16:43:22 +0200 | [diff] [blame] | 231 | |
| 232 | mutex_lock(&deferred_probe_mutex); |
| 233 | |
Ahmad Fatoum | 72a91f1 | 2021-03-23 16:37:13 +0100 | [diff] [blame] | 234 | reason = kasprintf(GFP_KERNEL, "%s: %pV", drv, vaf); |
| 235 | __device_set_deferred_probe_reason(dev, reason); |
Andrzej Hajda | d090b70 | 2020-07-13 16:43:22 +0200 | [diff] [blame] | 236 | |
| 237 | mutex_unlock(&deferred_probe_mutex); |
| 238 | } |
| 239 | |
Javier Martinez Canillas | 28af109a | 2018-07-08 15:34:59 +0200 | [diff] [blame] | 240 | /* |
| 241 | * deferred_devs_show() - Show the devices in the deferred probe pending list. |
| 242 | */ |
| 243 | static int deferred_devs_show(struct seq_file *s, void *data) |
| 244 | { |
| 245 | struct device_private *curr; |
| 246 | |
| 247 | mutex_lock(&deferred_probe_mutex); |
| 248 | |
| 249 | list_for_each_entry(curr, &deferred_probe_pending_list, deferred_probe) |
Andrzej Hajda | d090b70 | 2020-07-13 16:43:22 +0200 | [diff] [blame] | 250 | seq_printf(s, "%s\t%s", dev_name(curr->device), |
| 251 | curr->device->p->deferred_probe_reason ?: "\n"); |
Javier Martinez Canillas | 28af109a | 2018-07-08 15:34:59 +0200 | [diff] [blame] | 252 | |
| 253 | mutex_unlock(&deferred_probe_mutex); |
| 254 | |
| 255 | return 0; |
| 256 | } |
| 257 | DEFINE_SHOW_ATTRIBUTE(deferred_devs); |
| 258 | |
Saravana Kannan | f516d01 | 2022-06-01 00:07:02 -0700 | [diff] [blame] | 259 | #ifdef CONFIG_MODULES |
Javier Martinez Canillas | 504fa21 | 2022-12-28 00:21:52 +0100 | [diff] [blame] | 260 | static int driver_deferred_probe_timeout = 10; |
Saravana Kannan | f516d01 | 2022-06-01 00:07:02 -0700 | [diff] [blame] | 261 | #else |
Javier Martinez Canillas | 504fa21 | 2022-12-28 00:21:52 +0100 | [diff] [blame] | 262 | static int driver_deferred_probe_timeout; |
Saravana Kannan | f516d01 | 2022-06-01 00:07:02 -0700 | [diff] [blame] | 263 | #endif |
| 264 | |
Rob Herring | 25b4e70 | 2018-07-09 09:41:48 -0600 | [diff] [blame] | 265 | static int __init deferred_probe_timeout_setup(char *str) |
| 266 | { |
Muchun Song | 63c9804 | 2018-10-28 14:39:11 +0800 | [diff] [blame] | 267 | int timeout; |
| 268 | |
| 269 | if (!kstrtoint(str, 10, &timeout)) |
John Stultz | 64c775f | 2020-02-25 05:08:27 +0000 | [diff] [blame] | 270 | driver_deferred_probe_timeout = timeout; |
Rob Herring | 25b4e70 | 2018-07-09 09:41:48 -0600 | [diff] [blame] | 271 | return 1; |
| 272 | } |
| 273 | __setup("deferred_probe_timeout=", deferred_probe_timeout_setup); |
| 274 | |
Saravana Kannan | 13a8e0f | 2022-08-19 15:16:11 -0700 | [diff] [blame] | 275 | /** |
| 276 | * driver_deferred_probe_check_state() - Check deferred probe state |
| 277 | * @dev: device to check |
| 278 | * |
| 279 | * Return: |
| 280 | * * -ENODEV if initcalls have completed and modules are disabled. |
| 281 | * * -ETIMEDOUT if the deferred probe timeout was set and has expired |
| 282 | * and modules are enabled. |
| 283 | * * -EPROBE_DEFER in other cases. |
| 284 | * |
| 285 | * Drivers or subsystems can opt-in to calling this function instead of directly |
| 286 | * returning -EPROBE_DEFER. |
| 287 | */ |
| 288 | int driver_deferred_probe_check_state(struct device *dev) |
| 289 | { |
| 290 | if (!IS_ENABLED(CONFIG_MODULES) && initcalls_done) { |
| 291 | dev_warn(dev, "ignoring dependency for device, assuming no driver\n"); |
| 292 | return -ENODEV; |
| 293 | } |
| 294 | |
| 295 | if (!driver_deferred_probe_timeout && initcalls_done) { |
| 296 | dev_warn(dev, "deferred probe timeout, ignoring dependency\n"); |
| 297 | return -ETIMEDOUT; |
| 298 | } |
| 299 | |
| 300 | return -EPROBE_DEFER; |
| 301 | } |
| 302 | EXPORT_SYMBOL_GPL(driver_deferred_probe_check_state); |
| 303 | |
Rob Herring | 25b4e70 | 2018-07-09 09:41:48 -0600 | [diff] [blame] | 304 | static void deferred_probe_timeout_work_func(struct work_struct *work) |
| 305 | { |
Saravana Kannan | eed6e41 | 2021-04-01 21:03:40 -0700 | [diff] [blame] | 306 | struct device_private *p; |
Rob Herring | 25b4e70 | 2018-07-09 09:41:48 -0600 | [diff] [blame] | 307 | |
Saravana Kannan | d46f3e3 | 2021-04-01 21:03:41 -0700 | [diff] [blame] | 308 | fw_devlink_drivers_done(); |
| 309 | |
Saravana Kannan | 13a8e0f | 2022-08-19 15:16:11 -0700 | [diff] [blame] | 310 | driver_deferred_probe_timeout = 0; |
Rob Herring | 25b4e70 | 2018-07-09 09:41:48 -0600 | [diff] [blame] | 311 | driver_deferred_probe_trigger(); |
| 312 | flush_work(&deferred_probe_work); |
| 313 | |
Saravana Kannan | eed6e41 | 2021-04-01 21:03:40 -0700 | [diff] [blame] | 314 | mutex_lock(&deferred_probe_mutex); |
| 315 | list_for_each_entry(p, &deferred_probe_pending_list, deferred_probe) |
| 316 | dev_info(p->device, "deferred probe pending\n"); |
| 317 | mutex_unlock(&deferred_probe_mutex); |
Rob Herring | 25b4e70 | 2018-07-09 09:41:48 -0600 | [diff] [blame] | 318 | } |
| 319 | static DECLARE_DELAYED_WORK(deferred_probe_timeout_work, deferred_probe_timeout_work_func); |
| 320 | |
Saravana Kannan | 2b28a1a | 2022-04-29 15:09:32 -0700 | [diff] [blame] | 321 | void deferred_probe_extend_timeout(void) |
| 322 | { |
| 323 | /* |
| 324 | * If the work hasn't been queued yet or if the work expired, don't |
| 325 | * start a new one. |
| 326 | */ |
| 327 | if (cancel_delayed_work(&deferred_probe_timeout_work)) { |
| 328 | schedule_delayed_work(&deferred_probe_timeout_work, |
| 329 | driver_deferred_probe_timeout * HZ); |
| 330 | pr_debug("Extended deferred probe timeout by %d secs\n", |
| 331 | driver_deferred_probe_timeout); |
| 332 | } |
| 333 | } |
| 334 | |
Strashko, Grygorii | 013c074 | 2015-11-10 11:42:34 +0200 | [diff] [blame] | 335 | /** |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 336 | * deferred_probe_initcall() - Enable probing of deferred devices |
| 337 | * |
| 338 | * We don't want to get in the way when the bulk of drivers are getting probed. |
| 339 | * Instead, this initcall makes sure that deferred probing is delayed until |
| 340 | * late_initcall time. |
| 341 | */ |
| 342 | static int deferred_probe_initcall(void) |
| 343 | { |
Greg Kroah-Hartman | 2942df67 | 2021-02-16 15:24:00 +0100 | [diff] [blame] | 344 | debugfs_create_file("devices_deferred", 0444, NULL, NULL, |
| 345 | &deferred_devs_fops); |
Javier Martinez Canillas | 28af109a | 2018-07-08 15:34:59 +0200 | [diff] [blame] | 346 | |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 347 | driver_deferred_probe_enable = true; |
| 348 | driver_deferred_probe_trigger(); |
Grant Likely | d72cca1 | 2013-02-14 18:14:27 +0000 | [diff] [blame] | 349 | /* Sort as many dependencies as possible before exiting initcalls */ |
Bhaktipriya Shridhar | 2c507e4 | 2016-08-30 22:45:34 +0530 | [diff] [blame] | 350 | flush_work(&deferred_probe_work); |
Rob Herring | 25b4e70 | 2018-07-09 09:41:48 -0600 | [diff] [blame] | 351 | initcalls_done = true; |
| 352 | |
Saravana Kannan | d46f3e3 | 2021-04-01 21:03:41 -0700 | [diff] [blame] | 353 | if (!IS_ENABLED(CONFIG_MODULES)) |
| 354 | fw_devlink_drivers_done(); |
| 355 | |
Rob Herring | 25b4e70 | 2018-07-09 09:41:48 -0600 | [diff] [blame] | 356 | /* |
| 357 | * Trigger deferred probe again, this time we won't defer anything |
| 358 | * that is optional |
| 359 | */ |
| 360 | driver_deferred_probe_trigger(); |
| 361 | flush_work(&deferred_probe_work); |
| 362 | |
John Stultz | 64c775f | 2020-02-25 05:08:27 +0000 | [diff] [blame] | 363 | if (driver_deferred_probe_timeout > 0) { |
Rob Herring | 25b4e70 | 2018-07-09 09:41:48 -0600 | [diff] [blame] | 364 | schedule_delayed_work(&deferred_probe_timeout_work, |
John Stultz | 64c775f | 2020-02-25 05:08:27 +0000 | [diff] [blame] | 365 | driver_deferred_probe_timeout * HZ); |
Rob Herring | 25b4e70 | 2018-07-09 09:41:48 -0600 | [diff] [blame] | 366 | } |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 367 | return 0; |
| 368 | } |
| 369 | late_initcall(deferred_probe_initcall); |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 370 | |
Javier Martinez Canillas | 28af109a | 2018-07-08 15:34:59 +0200 | [diff] [blame] | 371 | static void __exit deferred_probe_exit(void) |
| 372 | { |
Greg Kroah-Hartman | 36c893d | 2023-02-02 15:16:21 +0100 | [diff] [blame] | 373 | debugfs_lookup_and_remove("devices_deferred", NULL); |
Javier Martinez Canillas | 28af109a | 2018-07-08 15:34:59 +0200 | [diff] [blame] | 374 | } |
| 375 | __exitcall(deferred_probe_exit); |
| 376 | |
Tomeu Vizoso | 6b9cb42 | 2016-01-07 16:46:12 +0100 | [diff] [blame] | 377 | /** |
| 378 | * device_is_bound() - Check if device is bound to a driver |
| 379 | * @dev: device to check |
| 380 | * |
| 381 | * Returns true if passed device has already finished probing successfully |
| 382 | * against a driver. |
| 383 | * |
| 384 | * This function must be called with the device lock held. |
| 385 | */ |
| 386 | bool device_is_bound(struct device *dev) |
| 387 | { |
Rafael J. Wysocki | 3ded910 | 2016-01-12 01:51:44 +0100 | [diff] [blame] | 388 | return dev->p && klist_node_attached(&dev->p->knode_driver); |
Tomeu Vizoso | 6b9cb42 | 2016-01-07 16:46:12 +0100 | [diff] [blame] | 389 | } |
| 390 | |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 391 | static void driver_bound(struct device *dev) |
| 392 | { |
Tomeu Vizoso | 6b9cb42 | 2016-01-07 16:46:12 +0100 | [diff] [blame] | 393 | if (device_is_bound(dev)) { |
Christophe JAILLET | eb7fbc9 | 2020-04-11 15:31:58 +0200 | [diff] [blame] | 394 | pr_warn("%s: device %s already bound\n", |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 395 | __func__, kobject_name(&dev->kobj)); |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 396 | return; |
| 397 | } |
| 398 | |
Frank Rowand | 94f8cc0 | 2014-04-16 17:12:30 -0700 | [diff] [blame] | 399 | pr_debug("driver: '%s': %s: bound to device '%s'\n", dev->driver->name, |
| 400 | __func__, dev_name(dev)); |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 401 | |
Stefani Seibold | fbb88fa | 2010-03-06 17:50:14 +0100 | [diff] [blame] | 402 | klist_add_tail(&dev->p->knode_driver, &dev->driver->p->klist_devices); |
Rafael J. Wysocki | 9ed9895 | 2016-10-30 17:32:16 +0100 | [diff] [blame] | 403 | device_links_driver_bound(dev); |
Stefani Seibold | fbb88fa | 2010-03-06 17:50:14 +0100 | [diff] [blame] | 404 | |
Tomeu Vizoso | aa8e54b5 | 2016-01-07 16:46:14 +0100 | [diff] [blame] | 405 | device_pm_check_callbacks(dev); |
| 406 | |
Greg Kroah-Hartman | 8b0372a | 2012-03-08 12:20:37 -0800 | [diff] [blame] | 407 | /* |
| 408 | * Make sure the device is no longer in one of the deferred lists and |
| 409 | * kick off retrying all pending devices |
| 410 | */ |
Grant Likely | d1c3414 | 2012-03-05 08:47:41 -0700 | [diff] [blame] | 411 | driver_deferred_probe_del(dev); |
| 412 | driver_deferred_probe_trigger(); |
| 413 | |
Greg Kroah-Hartman | ed9f918 | 2023-01-11 10:23:31 +0100 | [diff] [blame] | 414 | bus_notify(dev, BUS_NOTIFY_BOUND_DRIVER); |
Dmitry Torokhov | 1455cf8 | 2017-07-19 17:24:30 -0700 | [diff] [blame] | 415 | kobject_uevent(&dev->kobj, KOBJ_BIND); |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 416 | } |
| 417 | |
Arend van Spriel | 3c47d19 | 2018-01-11 09:36:38 +0100 | [diff] [blame] | 418 | static ssize_t coredump_store(struct device *dev, struct device_attribute *attr, |
| 419 | const char *buf, size_t count) |
| 420 | { |
| 421 | device_lock(dev); |
Arend van Spriel | 1fe56e0 | 2018-03-15 10:55:25 +0100 | [diff] [blame] | 422 | dev->driver->coredump(dev); |
Arend van Spriel | 3c47d19 | 2018-01-11 09:36:38 +0100 | [diff] [blame] | 423 | device_unlock(dev); |
| 424 | |
| 425 | return count; |
| 426 | } |
| 427 | static DEVICE_ATTR_WO(coredump); |
| 428 | |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 429 | static int driver_sysfs_add(struct device *dev) |
| 430 | { |
| 431 | int ret; |
| 432 | |
Greg Kroah-Hartman | ed9f918 | 2023-01-11 10:23:31 +0100 | [diff] [blame] | 433 | bus_notify(dev, BUS_NOTIFY_BIND_DRIVER); |
Magnus Damm | 45daef0 | 2010-07-23 19:56:18 +0900 | [diff] [blame] | 434 | |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 435 | ret = sysfs_create_link(&dev->driver->p->kobj, &dev->kobj, |
Arend van Spriel | 3c47d19 | 2018-01-11 09:36:38 +0100 | [diff] [blame] | 436 | kobject_name(&dev->kobj)); |
| 437 | if (ret) |
| 438 | goto fail; |
| 439 | |
| 440 | ret = sysfs_create_link(&dev->kobj, &dev->driver->p->kobj, |
| 441 | "driver"); |
| 442 | if (ret) |
| 443 | goto rm_dev; |
| 444 | |
Jia-Ju Bai | d225ef6 | 2021-03-23 19:34:05 -0700 | [diff] [blame] | 445 | if (!IS_ENABLED(CONFIG_DEV_COREDUMP) || !dev->driver->coredump) |
| 446 | return 0; |
| 447 | |
| 448 | ret = device_create_file(dev, &dev_attr_coredump); |
| 449 | if (!ret) |
Arend van Spriel | 3c47d19 | 2018-01-11 09:36:38 +0100 | [diff] [blame] | 450 | return 0; |
| 451 | |
| 452 | sysfs_remove_link(&dev->kobj, "driver"); |
| 453 | |
| 454 | rm_dev: |
| 455 | sysfs_remove_link(&dev->driver->p->kobj, |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 456 | kobject_name(&dev->kobj)); |
Arend van Spriel | 3c47d19 | 2018-01-11 09:36:38 +0100 | [diff] [blame] | 457 | |
| 458 | fail: |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 459 | return ret; |
| 460 | } |
| 461 | |
| 462 | static void driver_sysfs_remove(struct device *dev) |
| 463 | { |
| 464 | struct device_driver *drv = dev->driver; |
| 465 | |
| 466 | if (drv) { |
Arend van Spriel | 3c47d19 | 2018-01-11 09:36:38 +0100 | [diff] [blame] | 467 | if (drv->coredump) |
| 468 | device_remove_file(dev, &dev_attr_coredump); |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 469 | sysfs_remove_link(&drv->p->kobj, kobject_name(&dev->kobj)); |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 470 | sysfs_remove_link(&dev->kobj, "driver"); |
| 471 | } |
| 472 | } |
| 473 | |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 474 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 475 | * device_bind_driver - bind a driver to one device. |
| 476 | * @dev: device. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 477 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 478 | * Allow manual attachment of a driver to a device. |
| 479 | * Caller must have already set @dev->driver. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 480 | * |
Lukas Wunner | fe940d7 | 2020-07-08 14:12:22 +0200 | [diff] [blame] | 481 | * Note that this does not modify the bus reference count. |
| 482 | * Please verify that is accounted for before calling this. |
| 483 | * (It is ok to call with no other effort from a driver's probe() method.) |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 484 | * |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 485 | * This function must be called with the device lock held. |
Jason Gunthorpe | 0d9f837 | 2021-06-17 16:22:13 +0200 | [diff] [blame] | 486 | * |
| 487 | * Callers should prefer to use device_driver_attach() instead. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 488 | */ |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 489 | int device_bind_driver(struct device *dev) |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 490 | { |
Cornelia Huck | cb986b7 | 2006-11-27 10:35:12 +0100 | [diff] [blame] | 491 | int ret; |
| 492 | |
| 493 | ret = driver_sysfs_add(dev); |
Saravana Kannan | b6f617d | 2021-03-02 13:11:31 -0800 | [diff] [blame] | 494 | if (!ret) { |
| 495 | device_links_force_bind(dev); |
Cornelia Huck | cb986b7 | 2006-11-27 10:35:12 +0100 | [diff] [blame] | 496 | driver_bound(dev); |
Saravana Kannan | b6f617d | 2021-03-02 13:11:31 -0800 | [diff] [blame] | 497 | } |
Greg Kroah-Hartman | ed9f918 | 2023-01-11 10:23:31 +0100 | [diff] [blame] | 498 | else |
| 499 | bus_notify(dev, BUS_NOTIFY_DRIVER_NOT_BOUND); |
Cornelia Huck | cb986b7 | 2006-11-27 10:35:12 +0100 | [diff] [blame] | 500 | return ret; |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 501 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 502 | EXPORT_SYMBOL_GPL(device_bind_driver); |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 503 | |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 504 | static atomic_t probe_count = ATOMIC_INIT(0); |
Andrew Morton | 735a7ff | 2006-10-27 11:42:37 -0700 | [diff] [blame] | 505 | static DECLARE_WAIT_QUEUE_HEAD(probe_waitqueue); |
| 506 | |
Saravana Kannan | 8fd456e | 2020-05-21 12:17:59 -0700 | [diff] [blame] | 507 | static ssize_t state_synced_show(struct device *dev, |
| 508 | struct device_attribute *attr, char *buf) |
| 509 | { |
| 510 | bool val; |
| 511 | |
| 512 | device_lock(dev); |
| 513 | val = dev->state_synced; |
| 514 | device_unlock(dev); |
Joe Perches | 948b3ed | 2020-09-16 13:40:42 -0700 | [diff] [blame] | 515 | |
Joe Perches | aa83889 | 2020-09-16 13:40:39 -0700 | [diff] [blame] | 516 | return sysfs_emit(buf, "%u\n", val); |
Saravana Kannan | 8fd456e | 2020-05-21 12:17:59 -0700 | [diff] [blame] | 517 | } |
| 518 | static DEVICE_ATTR_RO(state_synced); |
| 519 | |
Rob Herring | 9ad3072 | 2022-02-23 16:52:56 -0600 | [diff] [blame] | 520 | static void device_unbind_cleanup(struct device *dev) |
| 521 | { |
| 522 | devres_release_all(dev); |
| 523 | arch_teardown_dma_ops(dev); |
| 524 | kfree(dev->dma_range_map); |
| 525 | dev->dma_range_map = NULL; |
| 526 | dev->driver = NULL; |
| 527 | dev_set_drvdata(dev, NULL); |
| 528 | if (dev->pm_domain && dev->pm_domain->dismiss) |
| 529 | dev->pm_domain->dismiss(dev); |
| 530 | pm_runtime_reinit(dev); |
| 531 | dev_pm_set_driver_flags(dev, 0); |
| 532 | } |
Christoph Hellwig | e149964 | 2021-06-17 16:22:10 +0200 | [diff] [blame] | 533 | |
Rob Herring | 4b775aa | 2022-02-23 16:52:57 -0600 | [diff] [blame] | 534 | static void device_remove(struct device *dev) |
| 535 | { |
| 536 | device_remove_file(dev, &dev_attr_state_synced); |
| 537 | device_remove_groups(dev, dev->driver->dev_groups); |
| 538 | |
| 539 | if (dev->bus && dev->bus->remove) |
| 540 | dev->bus->remove(dev); |
| 541 | else if (dev->driver->remove) |
| 542 | dev->driver->remove(dev); |
| 543 | } |
| 544 | |
Christoph Hellwig | e149964 | 2021-06-17 16:22:10 +0200 | [diff] [blame] | 545 | static int call_driver_probe(struct device *dev, struct device_driver *drv) |
| 546 | { |
| 547 | int ret = 0; |
| 548 | |
| 549 | if (dev->bus->probe) |
| 550 | ret = dev->bus->probe(dev); |
| 551 | else if (drv->probe) |
| 552 | ret = drv->probe(dev); |
| 553 | |
| 554 | switch (ret) { |
| 555 | case 0: |
| 556 | break; |
| 557 | case -EPROBE_DEFER: |
| 558 | /* Driver requested deferred probing */ |
| 559 | dev_dbg(dev, "Driver %s requests probe deferral\n", drv->name); |
| 560 | break; |
| 561 | case -ENODEV: |
| 562 | case -ENXIO: |
| 563 | pr_debug("%s: probe of %s rejects match %d\n", |
| 564 | drv->name, dev_name(dev), ret); |
| 565 | break; |
| 566 | default: |
| 567 | /* driver matched but the probe failed */ |
| 568 | pr_warn("%s: probe of %s failed with error %d\n", |
| 569 | drv->name, dev_name(dev), ret); |
| 570 | break; |
| 571 | } |
| 572 | |
| 573 | return ret; |
| 574 | } |
| 575 | |
Cornelia Huck | 21c7f30 | 2007-02-05 16:15:25 -0800 | [diff] [blame] | 576 | static int really_probe(struct device *dev, struct device_driver *drv) |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 577 | { |
Rob Herring | c5f0627 | 2016-10-11 13:41:02 -0500 | [diff] [blame] | 578 | bool test_remove = IS_ENABLED(CONFIG_DEBUG_TEST_DRIVER_REMOVE) && |
| 579 | !drv->suppress_bind_attrs; |
Saravana Kannan | 2f8c3ae | 2022-06-01 00:07:00 -0700 | [diff] [blame] | 580 | int ret, link_ret; |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 581 | |
Strashko, Grygorii | 013c074 | 2015-11-10 11:42:34 +0200 | [diff] [blame] | 582 | if (defer_all_probes) { |
| 583 | /* |
| 584 | * Value of defer_all_probes can be set only by |
Randy Dunlap | dbf03d656 | 2018-11-05 23:41:27 -0800 | [diff] [blame] | 585 | * device_block_probing() which, in turn, will call |
Strashko, Grygorii | 013c074 | 2015-11-10 11:42:34 +0200 | [diff] [blame] | 586 | * wait_for_device_probe() right after that to avoid any races. |
| 587 | */ |
| 588 | dev_dbg(dev, "Driver %s force probe deferral\n", drv->name); |
Christoph Hellwig | 45ddcb4 | 2021-06-17 16:22:12 +0200 | [diff] [blame] | 589 | return -EPROBE_DEFER; |
Strashko, Grygorii | 013c074 | 2015-11-10 11:42:34 +0200 | [diff] [blame] | 590 | } |
| 591 | |
Saravana Kannan | 2f8c3ae | 2022-06-01 00:07:00 -0700 | [diff] [blame] | 592 | link_ret = device_links_check_suppliers(dev); |
| 593 | if (link_ret == -EPROBE_DEFER) |
| 594 | return link_ret; |
Rafael J. Wysocki | 9ed9895 | 2016-10-30 17:32:16 +0100 | [diff] [blame] | 595 | |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 596 | pr_debug("bus: '%s': %s: probing driver %s with device %s\n", |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 597 | drv->bus->name, __func__, drv->name, dev_name(dev)); |
Geert Uytterhoeven | 7c35e69 | 2019-12-06 14:22:19 +0100 | [diff] [blame] | 598 | if (!list_empty(&dev->devres_head)) { |
| 599 | dev_crit(dev, "Resources present before probing\n"); |
Tetsuo Handa | b292b50 | 2020-07-13 11:12:54 +0900 | [diff] [blame] | 600 | ret = -EBUSY; |
| 601 | goto done; |
Geert Uytterhoeven | 7c35e69 | 2019-12-06 14:22:19 +0100 | [diff] [blame] | 602 | } |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 603 | |
Rob Herring | bea5b15 | 2016-08-11 10:20:58 -0500 | [diff] [blame] | 604 | re_probe: |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 605 | dev->driver = drv; |
Linus Walleij | ab78029 | 2013-01-22 10:56:14 -0700 | [diff] [blame] | 606 | |
| 607 | /* If using pinctrl, bind pins now before probing */ |
| 608 | ret = pinctrl_bind_pins(dev); |
| 609 | if (ret) |
Andy Shevchenko | 14b6257 | 2015-12-04 23:49:17 +0200 | [diff] [blame] | 610 | goto pinctrl_bind_failed; |
Linus Walleij | ab78029 | 2013-01-22 10:56:14 -0700 | [diff] [blame] | 611 | |
Christoph Hellwig | ccf640f | 2018-08-24 09:40:24 +0200 | [diff] [blame] | 612 | if (dev->bus->dma_configure) { |
| 613 | ret = dev->bus->dma_configure(dev); |
| 614 | if (ret) |
Lu Baolu | 00eb74e | 2021-12-31 11:39:01 +0800 | [diff] [blame] | 615 | goto pinctrl_bind_failed; |
Christoph Hellwig | ccf640f | 2018-08-24 09:40:24 +0200 | [diff] [blame] | 616 | } |
Sricharan R | 09515ef | 2017-04-10 16:51:01 +0530 | [diff] [blame] | 617 | |
Zhen Lei | f04948d | 2021-07-07 15:43:01 +0800 | [diff] [blame] | 618 | ret = driver_sysfs_add(dev); |
| 619 | if (ret) { |
Christophe JAILLET | eb7fbc9 | 2020-04-11 15:31:58 +0200 | [diff] [blame] | 620 | pr_err("%s: driver_sysfs_add(%s) failed\n", |
| 621 | __func__, dev_name(dev)); |
Lu Baolu | 885e502 | 2021-12-31 11:39:00 +0800 | [diff] [blame] | 622 | goto sysfs_failed; |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 623 | } |
| 624 | |
Rafael J. Wysocki | e90d553 | 2015-03-20 13:59:27 +0100 | [diff] [blame] | 625 | if (dev->pm_domain && dev->pm_domain->activate) { |
| 626 | ret = dev->pm_domain->activate(dev); |
| 627 | if (ret) |
| 628 | goto probe_failed; |
| 629 | } |
| 630 | |
Christoph Hellwig | 45ddcb4 | 2021-06-17 16:22:12 +0200 | [diff] [blame] | 631 | ret = call_driver_probe(dev, drv); |
| 632 | if (ret) { |
Christoph Hellwig | e149964 | 2021-06-17 16:22:10 +0200 | [diff] [blame] | 633 | /* |
Saravana Kannan | 2f8c3ae | 2022-06-01 00:07:00 -0700 | [diff] [blame] | 634 | * If fw_devlink_best_effort is active (denoted by -EAGAIN), the |
| 635 | * device might actually probe properly once some of its missing |
| 636 | * suppliers have probed. So, treat this as if the driver |
| 637 | * returned -EPROBE_DEFER. |
| 638 | */ |
| 639 | if (link_ret == -EAGAIN) |
| 640 | ret = -EPROBE_DEFER; |
| 641 | |
| 642 | /* |
Christoph Hellwig | ef6dcbd | 2021-06-17 16:22:11 +0200 | [diff] [blame] | 643 | * Return probe errors as positive values so that the callers |
| 644 | * can distinguish them from other errors. |
Christoph Hellwig | e149964 | 2021-06-17 16:22:10 +0200 | [diff] [blame] | 645 | */ |
Christoph Hellwig | 45ddcb4 | 2021-06-17 16:22:12 +0200 | [diff] [blame] | 646 | ret = -ret; |
Christoph Hellwig | e149964 | 2021-06-17 16:22:10 +0200 | [diff] [blame] | 647 | goto probe_failed; |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 648 | } |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 649 | |
Zhen Lei | f04948d | 2021-07-07 15:43:01 +0800 | [diff] [blame] | 650 | ret = device_add_groups(dev, drv->dev_groups); |
| 651 | if (ret) { |
Dmitry Torokhov | 23b6904 | 2019-07-31 14:43:40 +0200 | [diff] [blame] | 652 | dev_err(dev, "device_add_groups() failed\n"); |
| 653 | goto dev_groups_failed; |
| 654 | } |
| 655 | |
Zhen Lei | f04948d | 2021-07-07 15:43:01 +0800 | [diff] [blame] | 656 | if (dev_has_sync_state(dev)) { |
| 657 | ret = device_create_file(dev, &dev_attr_state_synced); |
| 658 | if (ret) { |
| 659 | dev_err(dev, "state_synced sysfs add failed\n"); |
| 660 | goto dev_sysfs_state_synced_failed; |
| 661 | } |
Saravana Kannan | 8fd456e | 2020-05-21 12:17:59 -0700 | [diff] [blame] | 662 | } |
| 663 | |
Rob Herring | bea5b15 | 2016-08-11 10:20:58 -0500 | [diff] [blame] | 664 | if (test_remove) { |
| 665 | test_remove = false; |
| 666 | |
Rob Herring | 4b775aa | 2022-02-23 16:52:57 -0600 | [diff] [blame] | 667 | device_remove(dev); |
Rob Herring | bea5b15 | 2016-08-11 10:20:58 -0500 | [diff] [blame] | 668 | driver_sysfs_remove(dev); |
Rob Herring | 9ad3072 | 2022-02-23 16:52:56 -0600 | [diff] [blame] | 669 | device_unbind_cleanup(dev); |
Rob Herring | bea5b15 | 2016-08-11 10:20:58 -0500 | [diff] [blame] | 670 | |
| 671 | goto re_probe; |
| 672 | } |
| 673 | |
Douglas Anderson | ef0eebc | 2015-10-20 21:15:06 -0700 | [diff] [blame] | 674 | pinctrl_init_done(dev); |
| 675 | |
Rafael J. Wysocki | e90d553 | 2015-03-20 13:59:27 +0100 | [diff] [blame] | 676 | if (dev->pm_domain && dev->pm_domain->sync) |
| 677 | dev->pm_domain->sync(dev); |
| 678 | |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 679 | driver_bound(dev); |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 680 | pr_debug("bus: '%s': %s: bound device %s to driver %s\n", |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 681 | drv->bus->name, __func__, dev_name(dev), drv->name); |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 682 | goto done; |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 683 | |
Saravana Kannan | 8fd456e | 2020-05-21 12:17:59 -0700 | [diff] [blame] | 684 | dev_sysfs_state_synced_failed: |
Dmitry Torokhov | 23b6904 | 2019-07-31 14:43:40 +0200 | [diff] [blame] | 685 | dev_groups_failed: |
Rob Herring | 4b775aa | 2022-02-23 16:52:57 -0600 | [diff] [blame] | 686 | device_remove(dev); |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 687 | probe_failed: |
Lu Baolu | 885e502 | 2021-12-31 11:39:00 +0800 | [diff] [blame] | 688 | driver_sysfs_remove(dev); |
| 689 | sysfs_failed: |
Greg Kroah-Hartman | ed9f918 | 2023-01-11 10:23:31 +0100 | [diff] [blame] | 690 | bus_notify(dev, BUS_NOTIFY_DRIVER_NOT_BOUND); |
Lu Baolu | 25f3bcf | 2022-04-18 08:49:51 +0800 | [diff] [blame] | 691 | if (dev->bus && dev->bus->dma_cleanup) |
| 692 | dev->bus->dma_cleanup(dev); |
Andy Shevchenko | 14b6257 | 2015-12-04 23:49:17 +0200 | [diff] [blame] | 693 | pinctrl_bind_failed: |
Rafael J. Wysocki | 9ed9895 | 2016-10-30 17:32:16 +0100 | [diff] [blame] | 694 | device_links_no_driver(dev); |
Rob Herring | 9ad3072 | 2022-02-23 16:52:56 -0600 | [diff] [blame] | 695 | device_unbind_cleanup(dev); |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 696 | done: |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 697 | return ret; |
| 698 | } |
| 699 | |
Todd Poynor | 0a50f61 | 2018-06-20 17:35:56 -0700 | [diff] [blame] | 700 | /* |
| 701 | * For initcall_debug, show the driver probe time. |
| 702 | */ |
| 703 | static int really_probe_debug(struct device *dev, struct device_driver *drv) |
| 704 | { |
Zenghui Yu | e3aa745 | 2020-08-03 11:33:43 +0800 | [diff] [blame] | 705 | ktime_t calltime, rettime; |
Todd Poynor | 0a50f61 | 2018-06-20 17:35:56 -0700 | [diff] [blame] | 706 | int ret; |
| 707 | |
| 708 | calltime = ktime_get(); |
| 709 | ret = really_probe(dev, drv); |
| 710 | rettime = ktime_get(); |
Christophe JAILLET | eb7fbc9 | 2020-04-11 15:31:58 +0200 | [diff] [blame] | 711 | pr_debug("probe of %s returned %d after %lld usecs\n", |
Zenghui Yu | e3aa745 | 2020-08-03 11:33:43 +0800 | [diff] [blame] | 712 | dev_name(dev), ret, ktime_us_delta(rettime, calltime)); |
Todd Poynor | 0a50f61 | 2018-06-20 17:35:56 -0700 | [diff] [blame] | 713 | return ret; |
| 714 | } |
| 715 | |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 716 | /** |
| 717 | * driver_probe_done |
| 718 | * Determine if the probe sequence is finished or not. |
| 719 | * |
| 720 | * Should somehow figure out how to use a semaphore, not an atomic variable... |
| 721 | */ |
| 722 | int driver_probe_done(void) |
| 723 | { |
Andy Shevchenko | 927f828 | 2020-03-24 14:20:22 +0200 | [diff] [blame] | 724 | int local_probe_count = atomic_read(&probe_count); |
| 725 | |
| 726 | pr_debug("%s: probe_count = %d\n", __func__, local_probe_count); |
| 727 | if (local_probe_count) |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 728 | return -EBUSY; |
| 729 | return 0; |
| 730 | } |
| 731 | |
| 732 | /** |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 733 | * wait_for_device_probe |
| 734 | * Wait for device probing to be completed. |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 735 | */ |
Ming Lei | b23530e | 2009-02-21 16:45:07 +0800 | [diff] [blame] | 736 | void wait_for_device_probe(void) |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 737 | { |
Strashko, Grygorii | 013c074 | 2015-11-10 11:42:34 +0200 | [diff] [blame] | 738 | /* wait for the deferred probe workqueue to finish */ |
Bhaktipriya Shridhar | 2c507e4 | 2016-08-30 22:45:34 +0530 | [diff] [blame] | 739 | flush_work(&deferred_probe_work); |
Strashko, Grygorii | 013c074 | 2015-11-10 11:42:34 +0200 | [diff] [blame] | 740 | |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 741 | /* wait for the known devices to complete their probing */ |
Ming Lei | b23530e | 2009-02-21 16:45:07 +0800 | [diff] [blame] | 742 | wait_event(probe_waitqueue, atomic_read(&probe_count) == 0); |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 743 | async_synchronize_full(); |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 744 | } |
Arjan van de Ven | d4d5291 | 2009-04-21 13:32:54 -0700 | [diff] [blame] | 745 | EXPORT_SYMBOL_GPL(wait_for_device_probe); |
Arjan van de Ven | 216773a | 2009-02-14 01:59:06 +0100 | [diff] [blame] | 746 | |
Christoph Hellwig | 45ddcb4 | 2021-06-17 16:22:12 +0200 | [diff] [blame] | 747 | static int __driver_probe_device(struct device_driver *drv, struct device *dev) |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 748 | { |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 749 | int ret = 0; |
| 750 | |
Jason Gunthorpe | 204db60 | 2021-06-17 16:22:09 +0200 | [diff] [blame] | 751 | if (dev->p->dead || !device_is_registered(dev)) |
Alan Stern | f2eaae1 | 2006-09-18 16:22:34 -0400 | [diff] [blame] | 752 | return -ENODEV; |
Jason Gunthorpe | 204db60 | 2021-06-17 16:22:09 +0200 | [diff] [blame] | 753 | if (dev->driver) |
| 754 | return -EBUSY; |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 755 | |
Saravana Kannan | f2db85b | 2021-03-02 13:11:30 -0800 | [diff] [blame] | 756 | dev->can_match = true; |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 757 | pr_debug("bus: '%s': %s: matched device %s with driver %s\n", |
Kay Sievers | 1e0b2cf | 2008-10-30 01:36:48 +0100 | [diff] [blame] | 758 | drv->bus->name, __func__, dev_name(dev), drv->name); |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 759 | |
Rafael J. Wysocki | b06c0b2f | 2018-06-12 10:24:13 +0200 | [diff] [blame] | 760 | pm_runtime_get_suppliers(dev); |
Rafael J. Wysocki | ddef08d | 2015-07-27 18:03:58 +0300 | [diff] [blame] | 761 | if (dev->parent) |
| 762 | pm_runtime_get_sync(dev->parent); |
| 763 | |
Rafael J. Wysocki | 5e928f7 | 2009-08-18 23:38:32 +0200 | [diff] [blame] | 764 | pm_runtime_barrier(dev); |
Todd Poynor | 0a50f61 | 2018-06-20 17:35:56 -0700 | [diff] [blame] | 765 | if (initcall_debug) |
| 766 | ret = really_probe_debug(dev, drv); |
| 767 | else |
| 768 | ret = really_probe(dev, drv); |
Ulf Hansson | fa180eb | 2013-04-10 17:00:48 +0200 | [diff] [blame] | 769 | pm_request_idle(dev); |
Greg Kroah-Hartman | d779249 | 2006-07-18 10:59:59 -0700 | [diff] [blame] | 770 | |
Rafael J. Wysocki | ddef08d | 2015-07-27 18:03:58 +0300 | [diff] [blame] | 771 | if (dev->parent) |
| 772 | pm_runtime_put(dev->parent); |
| 773 | |
Rafael J. Wysocki | b06c0b2f | 2018-06-12 10:24:13 +0200 | [diff] [blame] | 774 | pm_runtime_put_suppliers(dev); |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 775 | return ret; |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 776 | } |
| 777 | |
Christoph Hellwig | 45ddcb4 | 2021-06-17 16:22:12 +0200 | [diff] [blame] | 778 | /** |
| 779 | * driver_probe_device - attempt to bind device & driver together |
| 780 | * @drv: driver to bind a device to |
| 781 | * @dev: device to try to bind to the driver |
| 782 | * |
| 783 | * This function returns -ENODEV if the device is not registered, -EBUSY if it |
| 784 | * already has a driver, 0 if the device is bound successfully and a positive |
| 785 | * (inverted) error code for failures from the ->probe method. |
| 786 | * |
| 787 | * This function must be called with @dev lock held. When called for a |
| 788 | * USB interface, @dev->parent lock must be held as well. |
| 789 | * |
| 790 | * If the device has a parent, runtime-resume the parent before driver probing. |
| 791 | */ |
| 792 | static int driver_probe_device(struct device_driver *drv, struct device *dev) |
| 793 | { |
| 794 | int trigger_count = atomic_read(&deferred_trigger_count); |
| 795 | int ret; |
| 796 | |
| 797 | atomic_inc(&probe_count); |
| 798 | ret = __driver_probe_device(drv, dev); |
| 799 | if (ret == -EPROBE_DEFER || ret == EPROBE_DEFER) { |
| 800 | driver_deferred_probe_add(dev); |
| 801 | |
| 802 | /* |
| 803 | * Did a trigger occur while probing? Need to re-trigger if yes |
| 804 | */ |
| 805 | if (trigger_count != atomic_read(&deferred_trigger_count) && |
| 806 | !defer_all_probes) |
| 807 | driver_deferred_probe_trigger(); |
| 808 | } |
| 809 | atomic_dec(&probe_count); |
| 810 | wake_up_all(&probe_waitqueue); |
| 811 | return ret; |
| 812 | } |
| 813 | |
Feng Tang | 1ea61b6 | 2019-02-13 15:47:36 +0800 | [diff] [blame] | 814 | static inline bool cmdline_requested_async_probing(const char *drv_name) |
| 815 | { |
Saravana Kannan | f79f662e | 2022-05-03 17:53:43 -0700 | [diff] [blame] | 816 | bool async_drv; |
| 817 | |
| 818 | async_drv = parse_option_str(async_probe_drv_names, drv_name); |
| 819 | |
| 820 | return (async_probe_default != async_drv); |
Feng Tang | 1ea61b6 | 2019-02-13 15:47:36 +0800 | [diff] [blame] | 821 | } |
| 822 | |
| 823 | /* The option format is "driver_async_probe=drv_name1,drv_name2,..." */ |
| 824 | static int __init save_async_options(char *buf) |
| 825 | { |
| 826 | if (strlen(buf) >= ASYNC_DRV_NAMES_MAX_LEN) |
Christophe JAILLET | eb7fbc9 | 2020-04-11 15:31:58 +0200 | [diff] [blame] | 827 | pr_warn("Too long list of driver names for 'driver_async_probe'!\n"); |
Feng Tang | 1ea61b6 | 2019-02-13 15:47:36 +0800 | [diff] [blame] | 828 | |
Wolfram Sang | 07b7b88 | 2022-08-18 22:59:56 +0200 | [diff] [blame] | 829 | strscpy(async_probe_drv_names, buf, ASYNC_DRV_NAMES_MAX_LEN); |
Saravana Kannan | f79f662e | 2022-05-03 17:53:43 -0700 | [diff] [blame] | 830 | async_probe_default = parse_option_str(async_probe_drv_names, "*"); |
| 831 | |
Randy Dunlap | f2aad54 | 2022-02-28 20:18:29 -0800 | [diff] [blame] | 832 | return 1; |
Feng Tang | 1ea61b6 | 2019-02-13 15:47:36 +0800 | [diff] [blame] | 833 | } |
| 834 | __setup("driver_async_probe=", save_async_options); |
| 835 | |
Christoph Hellwig | 189a87f | 2022-10-30 10:22:55 +0100 | [diff] [blame] | 836 | static bool driver_allows_async_probing(struct device_driver *drv) |
mochel@digitalimplant.org | 2287c32 | 2005-03-24 10:50:24 -0800 | [diff] [blame] | 837 | { |
Luis R. Rodriguez | d173a13 | 2015-03-30 16:20:06 -0700 | [diff] [blame] | 838 | switch (drv->probe_type) { |
| 839 | case PROBE_PREFER_ASYNCHRONOUS: |
Luis R. Rodriguez | f2411da | 2015-03-30 16:20:05 -0700 | [diff] [blame] | 840 | return true; |
| 841 | |
Luis R. Rodriguez | d173a13 | 2015-03-30 16:20:06 -0700 | [diff] [blame] | 842 | case PROBE_FORCE_SYNCHRONOUS: |
| 843 | return false; |
Luis R. Rodriguez | f2411da | 2015-03-30 16:20:05 -0700 | [diff] [blame] | 844 | |
Luis R. Rodriguez | d173a13 | 2015-03-30 16:20:06 -0700 | [diff] [blame] | 845 | default: |
Feng Tang | 1ea61b6 | 2019-02-13 15:47:36 +0800 | [diff] [blame] | 846 | if (cmdline_requested_async_probing(drv->name)) |
| 847 | return true; |
| 848 | |
Dmitry Torokhov | 80c6e14 | 2015-05-21 15:49:37 -0700 | [diff] [blame] | 849 | if (module_requested_async_probing(drv->owner)) |
Luis R. Rodriguez | d173a13 | 2015-03-30 16:20:06 -0700 | [diff] [blame] | 850 | return true; |
| 851 | |
| 852 | return false; |
| 853 | } |
Dmitry Torokhov | 765230b | 2015-03-30 16:20:04 -0700 | [diff] [blame] | 854 | } |
| 855 | |
| 856 | struct device_attach_data { |
| 857 | struct device *dev; |
| 858 | |
| 859 | /* |
Tom Rix | b4ae8c2 | 2022-02-12 06:32:33 -0800 | [diff] [blame] | 860 | * Indicates whether we are considering asynchronous probing or |
Dmitry Torokhov | 765230b | 2015-03-30 16:20:04 -0700 | [diff] [blame] | 861 | * not. Only initial binding after device or driver registration |
| 862 | * (including deferral processing) may be done asynchronously, the |
| 863 | * rest is always synchronous, as we expect it is being done by |
| 864 | * request from userspace. |
| 865 | */ |
| 866 | bool check_async; |
| 867 | |
| 868 | /* |
| 869 | * Indicates if we are binding synchronous or asynchronous drivers. |
| 870 | * When asynchronous probing is enabled we'll execute 2 passes |
| 871 | * over drivers: first pass doing synchronous probing and second |
| 872 | * doing asynchronous probing (if synchronous did not succeed - |
| 873 | * most likely because there was no driver requiring synchronous |
| 874 | * probing - and we found asynchronous driver during first pass). |
| 875 | * The 2 passes are done because we can't shoot asynchronous |
| 876 | * probe for given device and driver from bus_for_each_drv() since |
| 877 | * driver pointer is not guaranteed to stay valid once |
| 878 | * bus_for_each_drv() iterates to the next driver on the bus. |
| 879 | */ |
| 880 | bool want_async; |
| 881 | |
| 882 | /* |
| 883 | * We'll set have_async to 'true' if, while scanning for matching |
| 884 | * driver, we'll encounter one that requests asynchronous probing. |
| 885 | */ |
| 886 | bool have_async; |
| 887 | }; |
| 888 | |
| 889 | static int __device_attach_driver(struct device_driver *drv, void *_data) |
| 890 | { |
| 891 | struct device_attach_data *data = _data; |
| 892 | struct device *dev = data->dev; |
| 893 | bool async_allowed; |
Tomeu Vizoso | 656b803 | 2016-02-15 09:25:06 +0100 | [diff] [blame] | 894 | int ret; |
Dmitry Torokhov | 765230b | 2015-03-30 16:20:04 -0700 | [diff] [blame] | 895 | |
Tomeu Vizoso | 656b803 | 2016-02-15 09:25:06 +0100 | [diff] [blame] | 896 | ret = driver_match_device(drv, dev); |
| 897 | if (ret == 0) { |
| 898 | /* no match */ |
Ming Lei | 49b420a | 2009-01-21 23:27:47 +0800 | [diff] [blame] | 899 | return 0; |
Tomeu Vizoso | 656b803 | 2016-02-15 09:25:06 +0100 | [diff] [blame] | 900 | } else if (ret == -EPROBE_DEFER) { |
| 901 | dev_dbg(dev, "Device match requests probe deferral\n"); |
Saravana Kannan | f2db85b | 2021-03-02 13:11:30 -0800 | [diff] [blame] | 902 | dev->can_match = true; |
Tomeu Vizoso | 656b803 | 2016-02-15 09:25:06 +0100 | [diff] [blame] | 903 | driver_deferred_probe_add(dev); |
Isaac J. Manjarres | 25e9fbf | 2022-08-17 11:40:26 -0700 | [diff] [blame] | 904 | /* |
| 905 | * Device can't match with a driver right now, so don't attempt |
| 906 | * to match or bind with other drivers on the bus. |
| 907 | */ |
| 908 | return ret; |
Tomeu Vizoso | 656b803 | 2016-02-15 09:25:06 +0100 | [diff] [blame] | 909 | } else if (ret < 0) { |
Christophe JAILLET | eb7fbc9 | 2020-04-11 15:31:58 +0200 | [diff] [blame] | 910 | dev_dbg(dev, "Bus failed to match device: %d\n", ret); |
Tomeu Vizoso | 656b803 | 2016-02-15 09:25:06 +0100 | [diff] [blame] | 911 | return ret; |
| 912 | } /* ret > 0 means positive match */ |
Ming Lei | 49b420a | 2009-01-21 23:27:47 +0800 | [diff] [blame] | 913 | |
Dmitry Torokhov | 765230b | 2015-03-30 16:20:04 -0700 | [diff] [blame] | 914 | async_allowed = driver_allows_async_probing(drv); |
| 915 | |
| 916 | if (async_allowed) |
| 917 | data->have_async = true; |
| 918 | |
| 919 | if (data->check_async && async_allowed != data->want_async) |
| 920 | return 0; |
| 921 | |
Christoph Hellwig | ef6dcbd | 2021-06-17 16:22:11 +0200 | [diff] [blame] | 922 | /* |
| 923 | * Ignore errors returned by ->probe so that the next driver can try |
| 924 | * its luck. |
| 925 | */ |
| 926 | ret = driver_probe_device(drv, dev); |
| 927 | if (ret < 0) |
| 928 | return ret; |
| 929 | return ret == 0; |
mochel@digitalimplant.org | 2287c32 | 2005-03-24 10:50:24 -0800 | [diff] [blame] | 930 | } |
| 931 | |
Dmitry Torokhov | 765230b | 2015-03-30 16:20:04 -0700 | [diff] [blame] | 932 | static void __device_attach_async_helper(void *_dev, async_cookie_t cookie) |
| 933 | { |
| 934 | struct device *dev = _dev; |
| 935 | struct device_attach_data data = { |
| 936 | .dev = dev, |
| 937 | .check_async = true, |
| 938 | .want_async = true, |
| 939 | }; |
| 940 | |
| 941 | device_lock(dev); |
| 942 | |
Alexander Duyck | 3451a49 | 2019-01-22 10:39:10 -0800 | [diff] [blame] | 943 | /* |
| 944 | * Check if device has already been removed or claimed. This may |
| 945 | * happen with driver loading, device discovery/registration, |
| 946 | * and deferred probe processing happens all at once with |
| 947 | * multiple threads. |
| 948 | */ |
| 949 | if (dev->p->dead || dev->driver) |
| 950 | goto out_unlock; |
| 951 | |
Rafael J. Wysocki | ddef08d | 2015-07-27 18:03:58 +0300 | [diff] [blame] | 952 | if (dev->parent) |
| 953 | pm_runtime_get_sync(dev->parent); |
| 954 | |
Dmitry Torokhov | 765230b | 2015-03-30 16:20:04 -0700 | [diff] [blame] | 955 | bus_for_each_drv(dev->bus, NULL, &data, __device_attach_driver); |
| 956 | dev_dbg(dev, "async probe completed\n"); |
| 957 | |
| 958 | pm_request_idle(dev); |
| 959 | |
Rafael J. Wysocki | ddef08d | 2015-07-27 18:03:58 +0300 | [diff] [blame] | 960 | if (dev->parent) |
| 961 | pm_runtime_put(dev->parent); |
Alexander Duyck | 3451a49 | 2019-01-22 10:39:10 -0800 | [diff] [blame] | 962 | out_unlock: |
Dmitry Torokhov | 765230b | 2015-03-30 16:20:04 -0700 | [diff] [blame] | 963 | device_unlock(dev); |
| 964 | |
| 965 | put_device(dev); |
| 966 | } |
| 967 | |
Dmitry Torokhov | 802a87f | 2015-05-20 16:36:31 -0700 | [diff] [blame] | 968 | static int __device_attach(struct device *dev, bool allow_async) |
Dmitry Torokhov | 765230b | 2015-03-30 16:20:04 -0700 | [diff] [blame] | 969 | { |
| 970 | int ret = 0; |
Zhang Wensheng | b232b02 | 2022-05-18 15:45:16 +0800 | [diff] [blame] | 971 | bool async = false; |
Dmitry Torokhov | 765230b | 2015-03-30 16:20:04 -0700 | [diff] [blame] | 972 | |
| 973 | device_lock(dev); |
Lukas Wunner | 6548883 | 2020-07-08 15:27:01 +0200 | [diff] [blame] | 974 | if (dev->p->dead) { |
| 975 | goto out_unlock; |
| 976 | } else if (dev->driver) { |
Tomeu Vizoso | 6b9cb42 | 2016-01-07 16:46:12 +0100 | [diff] [blame] | 977 | if (device_is_bound(dev)) { |
Dmitry Torokhov | 765230b | 2015-03-30 16:20:04 -0700 | [diff] [blame] | 978 | ret = 1; |
| 979 | goto out_unlock; |
| 980 | } |
| 981 | ret = device_bind_driver(dev); |
| 982 | if (ret == 0) |
| 983 | ret = 1; |
| 984 | else { |
| 985 | dev->driver = NULL; |
| 986 | ret = 0; |
| 987 | } |
| 988 | } else { |
| 989 | struct device_attach_data data = { |
| 990 | .dev = dev, |
| 991 | .check_async = allow_async, |
| 992 | .want_async = false, |
| 993 | }; |
| 994 | |
Rafael J. Wysocki | ddef08d | 2015-07-27 18:03:58 +0300 | [diff] [blame] | 995 | if (dev->parent) |
| 996 | pm_runtime_get_sync(dev->parent); |
| 997 | |
Dmitry Torokhov | 765230b | 2015-03-30 16:20:04 -0700 | [diff] [blame] | 998 | ret = bus_for_each_drv(dev->bus, NULL, &data, |
| 999 | __device_attach_driver); |
| 1000 | if (!ret && allow_async && data.have_async) { |
| 1001 | /* |
| 1002 | * If we could not find appropriate driver |
| 1003 | * synchronously and we are allowed to do |
| 1004 | * async probes and there are drivers that |
| 1005 | * want to probe asynchronously, we'll |
| 1006 | * try them. |
| 1007 | */ |
| 1008 | dev_dbg(dev, "scheduling asynchronous probe\n"); |
| 1009 | get_device(dev); |
Zhang Wensheng | b232b02 | 2022-05-18 15:45:16 +0800 | [diff] [blame] | 1010 | async = true; |
Dmitry Torokhov | 765230b | 2015-03-30 16:20:04 -0700 | [diff] [blame] | 1011 | } else { |
| 1012 | pm_request_idle(dev); |
| 1013 | } |
Rafael J. Wysocki | ddef08d | 2015-07-27 18:03:58 +0300 | [diff] [blame] | 1014 | |
| 1015 | if (dev->parent) |
| 1016 | pm_runtime_put(dev->parent); |
Dmitry Torokhov | 765230b | 2015-03-30 16:20:04 -0700 | [diff] [blame] | 1017 | } |
| 1018 | out_unlock: |
| 1019 | device_unlock(dev); |
Zhang Wensheng | b232b02 | 2022-05-18 15:45:16 +0800 | [diff] [blame] | 1020 | if (async) |
| 1021 | async_schedule_dev(__device_attach_async_helper, dev); |
Dmitry Torokhov | 765230b | 2015-03-30 16:20:04 -0700 | [diff] [blame] | 1022 | return ret; |
| 1023 | } |
| 1024 | |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1025 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1026 | * device_attach - try to attach device to a driver. |
| 1027 | * @dev: device. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1028 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1029 | * Walk the list of drivers that the bus has and call |
| 1030 | * driver_probe_device() for each pair. If a compatible |
| 1031 | * pair is found, break out and return. |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 1032 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1033 | * Returns 1 if the device was bound to a driver; |
Dmitry Torokhov | 59a3cd7 | 2009-05-05 20:38:28 -0700 | [diff] [blame] | 1034 | * 0 if no matching driver was found; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1035 | * -ENODEV if the device is not registered. |
Alan Stern | bf74ad5 | 2005-11-17 16:54:12 -0500 | [diff] [blame] | 1036 | * |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 1037 | * When called for a USB interface, @dev->parent lock must be held. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1038 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1039 | int device_attach(struct device *dev) |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1040 | { |
Dmitry Torokhov | 765230b | 2015-03-30 16:20:04 -0700 | [diff] [blame] | 1041 | return __device_attach(dev, false); |
mochel@digitalimplant.org | 2287c32 | 2005-03-24 10:50:24 -0800 | [diff] [blame] | 1042 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1043 | EXPORT_SYMBOL_GPL(device_attach); |
mochel@digitalimplant.org | 2287c32 | 2005-03-24 10:50:24 -0800 | [diff] [blame] | 1044 | |
Dmitry Torokhov | 765230b | 2015-03-30 16:20:04 -0700 | [diff] [blame] | 1045 | void device_initial_probe(struct device *dev) |
| 1046 | { |
| 1047 | __device_attach(dev, true); |
| 1048 | } |
| 1049 | |
Alexander Duyck | ed88747 | 2019-01-22 10:39:16 -0800 | [diff] [blame] | 1050 | /* |
| 1051 | * __device_driver_lock - acquire locks needed to manipulate dev->drv |
| 1052 | * @dev: Device we will update driver info for |
| 1053 | * @parent: Parent device. Needed if the bus requires parent lock |
| 1054 | * |
| 1055 | * This function will take the required locks for manipulating dev->drv. |
| 1056 | * Normally this will just be the @dev lock, but when called for a USB |
| 1057 | * interface, @parent lock will be held as well. |
| 1058 | */ |
| 1059 | static void __device_driver_lock(struct device *dev, struct device *parent) |
| 1060 | { |
| 1061 | if (parent && dev->bus->need_parent_lock) |
| 1062 | device_lock(parent); |
| 1063 | device_lock(dev); |
| 1064 | } |
| 1065 | |
| 1066 | /* |
| 1067 | * __device_driver_unlock - release locks needed to manipulate dev->drv |
| 1068 | * @dev: Device we will update driver info for |
| 1069 | * @parent: Parent device. Needed if the bus requires parent lock |
| 1070 | * |
| 1071 | * This function will release the required locks for manipulating dev->drv. |
Tom Rix | b4ae8c2 | 2022-02-12 06:32:33 -0800 | [diff] [blame] | 1072 | * Normally this will just be the @dev lock, but when called for a |
Alexander Duyck | ed88747 | 2019-01-22 10:39:16 -0800 | [diff] [blame] | 1073 | * USB interface, @parent lock will be released as well. |
| 1074 | */ |
| 1075 | static void __device_driver_unlock(struct device *dev, struct device *parent) |
| 1076 | { |
| 1077 | device_unlock(dev); |
| 1078 | if (parent && dev->bus->need_parent_lock) |
| 1079 | device_unlock(parent); |
| 1080 | } |
| 1081 | |
| 1082 | /** |
| 1083 | * device_driver_attach - attach a specific driver to a specific device |
| 1084 | * @drv: Driver to attach |
| 1085 | * @dev: Device to attach it to |
| 1086 | * |
| 1087 | * Manually attach driver to a device. Will acquire both @dev lock and |
Christoph Hellwig | ef6dcbd | 2021-06-17 16:22:11 +0200 | [diff] [blame] | 1088 | * @dev->parent lock if needed. Returns 0 on success, -ERR on failure. |
Alexander Duyck | ed88747 | 2019-01-22 10:39:16 -0800 | [diff] [blame] | 1089 | */ |
| 1090 | int device_driver_attach(struct device_driver *drv, struct device *dev) |
| 1091 | { |
Jason Gunthorpe | 204db60 | 2021-06-17 16:22:09 +0200 | [diff] [blame] | 1092 | int ret; |
Alexander Duyck | ed88747 | 2019-01-22 10:39:16 -0800 | [diff] [blame] | 1093 | |
| 1094 | __device_driver_lock(dev, dev->parent); |
Christoph Hellwig | 45ddcb4 | 2021-06-17 16:22:12 +0200 | [diff] [blame] | 1095 | ret = __driver_probe_device(drv, dev); |
Alexander Duyck | ed88747 | 2019-01-22 10:39:16 -0800 | [diff] [blame] | 1096 | __device_driver_unlock(dev, dev->parent); |
| 1097 | |
Christoph Hellwig | ef6dcbd | 2021-06-17 16:22:11 +0200 | [diff] [blame] | 1098 | /* also return probe errors as normal negative errnos */ |
| 1099 | if (ret > 0) |
| 1100 | ret = -ret; |
Christoph Hellwig | 45ddcb4 | 2021-06-17 16:22:12 +0200 | [diff] [blame] | 1101 | if (ret == -EPROBE_DEFER) |
| 1102 | return -EAGAIN; |
Alexander Duyck | ed88747 | 2019-01-22 10:39:16 -0800 | [diff] [blame] | 1103 | return ret; |
| 1104 | } |
Jason Gunthorpe | 0d9f837 | 2021-06-17 16:22:13 +0200 | [diff] [blame] | 1105 | EXPORT_SYMBOL_GPL(device_driver_attach); |
Alexander Duyck | ed88747 | 2019-01-22 10:39:16 -0800 | [diff] [blame] | 1106 | |
Alexander Duyck | ef0ff68 | 2019-01-22 10:39:21 -0800 | [diff] [blame] | 1107 | static void __driver_attach_async_helper(void *_dev, async_cookie_t cookie) |
| 1108 | { |
| 1109 | struct device *dev = _dev; |
| 1110 | struct device_driver *drv; |
Jason Gunthorpe | 204db60 | 2021-06-17 16:22:09 +0200 | [diff] [blame] | 1111 | int ret; |
Alexander Duyck | ef0ff68 | 2019-01-22 10:39:21 -0800 | [diff] [blame] | 1112 | |
| 1113 | __device_driver_lock(dev, dev->parent); |
Alexander Duyck | ef0ff68 | 2019-01-22 10:39:21 -0800 | [diff] [blame] | 1114 | drv = dev->p->async_driver; |
Mark-PK Tsai | 84e7c67 | 2022-03-16 15:43:28 +0800 | [diff] [blame] | 1115 | dev->p->async_driver = NULL; |
Jason Gunthorpe | 204db60 | 2021-06-17 16:22:09 +0200 | [diff] [blame] | 1116 | ret = driver_probe_device(drv, dev); |
Alexander Duyck | ef0ff68 | 2019-01-22 10:39:21 -0800 | [diff] [blame] | 1117 | __device_driver_unlock(dev, dev->parent); |
| 1118 | |
| 1119 | dev_dbg(dev, "driver %s async attach completed: %d\n", drv->name, ret); |
| 1120 | |
| 1121 | put_device(dev); |
| 1122 | } |
| 1123 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1124 | static int __driver_attach(struct device *dev, void *data) |
mochel@digitalimplant.org | 2287c32 | 2005-03-24 10:50:24 -0800 | [diff] [blame] | 1125 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1126 | struct device_driver *drv = data; |
Zhang Wensheng | 70fe758 | 2022-06-22 15:43:27 +0800 | [diff] [blame] | 1127 | bool async = false; |
Tomeu Vizoso | 656b803 | 2016-02-15 09:25:06 +0100 | [diff] [blame] | 1128 | int ret; |
mochel@digitalimplant.org | 2287c32 | 2005-03-24 10:50:24 -0800 | [diff] [blame] | 1129 | |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 1130 | /* |
| 1131 | * Lock device and try to bind to it. We drop the error |
| 1132 | * here and always return 0, because we need to keep trying |
| 1133 | * to bind to devices and some drivers will return an error |
| 1134 | * simply if it didn't support the device. |
| 1135 | * |
| 1136 | * driver_probe_device() will spit a warning if there |
| 1137 | * is an error. |
| 1138 | */ |
| 1139 | |
Tomeu Vizoso | 656b803 | 2016-02-15 09:25:06 +0100 | [diff] [blame] | 1140 | ret = driver_match_device(drv, dev); |
| 1141 | if (ret == 0) { |
| 1142 | /* no match */ |
Arjan van de Ven | 6cd4958 | 2008-09-14 08:32:06 -0700 | [diff] [blame] | 1143 | return 0; |
Tomeu Vizoso | 656b803 | 2016-02-15 09:25:06 +0100 | [diff] [blame] | 1144 | } else if (ret == -EPROBE_DEFER) { |
| 1145 | dev_dbg(dev, "Device match requests probe deferral\n"); |
Saravana Kannan | f2db85b | 2021-03-02 13:11:30 -0800 | [diff] [blame] | 1146 | dev->can_match = true; |
Tomeu Vizoso | 656b803 | 2016-02-15 09:25:06 +0100 | [diff] [blame] | 1147 | driver_deferred_probe_add(dev); |
Isaac J. Manjarres | 25e9fbf | 2022-08-17 11:40:26 -0700 | [diff] [blame] | 1148 | /* |
| 1149 | * Driver could not match with device, but may match with |
| 1150 | * another device on the bus. |
| 1151 | */ |
| 1152 | return 0; |
Tomeu Vizoso | 656b803 | 2016-02-15 09:25:06 +0100 | [diff] [blame] | 1153 | } else if (ret < 0) { |
Christophe JAILLET | eb7fbc9 | 2020-04-11 15:31:58 +0200 | [diff] [blame] | 1154 | dev_dbg(dev, "Bus failed to match device: %d\n", ret); |
Isaac J. Manjarres | 27c0d21 | 2022-09-20 17:14:13 -0700 | [diff] [blame] | 1155 | /* |
| 1156 | * Driver could not match with device, but may match with |
| 1157 | * another device on the bus. |
| 1158 | */ |
| 1159 | return 0; |
Tomeu Vizoso | 656b803 | 2016-02-15 09:25:06 +0100 | [diff] [blame] | 1160 | } /* ret > 0 means positive match */ |
Arjan van de Ven | 6cd4958 | 2008-09-14 08:32:06 -0700 | [diff] [blame] | 1161 | |
Alexander Duyck | ef0ff68 | 2019-01-22 10:39:21 -0800 | [diff] [blame] | 1162 | if (driver_allows_async_probing(drv)) { |
| 1163 | /* |
| 1164 | * Instead of probing the device synchronously we will |
| 1165 | * probe it asynchronously to allow for more parallelism. |
| 1166 | * |
| 1167 | * We only take the device lock here in order to guarantee |
| 1168 | * that the dev->driver and async_driver fields are protected |
| 1169 | */ |
| 1170 | dev_dbg(dev, "probing driver %s asynchronously\n", drv->name); |
| 1171 | device_lock(dev); |
Mark-PK Tsai | 84e7c67 | 2022-03-16 15:43:28 +0800 | [diff] [blame] | 1172 | if (!dev->driver && !dev->p->async_driver) { |
Alexander Duyck | ef0ff68 | 2019-01-22 10:39:21 -0800 | [diff] [blame] | 1173 | get_device(dev); |
| 1174 | dev->p->async_driver = drv; |
Zhang Wensheng | 70fe758 | 2022-06-22 15:43:27 +0800 | [diff] [blame] | 1175 | async = true; |
Alexander Duyck | ef0ff68 | 2019-01-22 10:39:21 -0800 | [diff] [blame] | 1176 | } |
| 1177 | device_unlock(dev); |
Zhang Wensheng | 70fe758 | 2022-06-22 15:43:27 +0800 | [diff] [blame] | 1178 | if (async) |
| 1179 | async_schedule_dev(__driver_attach_async_helper, dev); |
Alexander Duyck | ef0ff68 | 2019-01-22 10:39:21 -0800 | [diff] [blame] | 1180 | return 0; |
| 1181 | } |
| 1182 | |
Christoph Hellwig | ef6dcbd | 2021-06-17 16:22:11 +0200 | [diff] [blame] | 1183 | __device_driver_lock(dev, dev->parent); |
| 1184 | driver_probe_device(drv, dev); |
| 1185 | __device_driver_unlock(dev, dev->parent); |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 1186 | |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1187 | return 0; |
| 1188 | } |
| 1189 | |
| 1190 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1191 | * driver_attach - try to bind driver to devices. |
| 1192 | * @drv: driver. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1193 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1194 | * Walk the list of devices that the bus has on it and try to |
| 1195 | * match the driver with each one. If driver_probe_device() |
| 1196 | * returns 0 and the @dev->driver is set, we've found a |
| 1197 | * compatible pair. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1198 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1199 | int driver_attach(struct device_driver *drv) |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1200 | { |
Andrew Morton | f86db39 | 2006-08-14 22:43:20 -0700 | [diff] [blame] | 1201 | return bus_for_each_dev(drv->bus, NULL, drv, __driver_attach); |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1202 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1203 | EXPORT_SYMBOL_GPL(driver_attach); |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1204 | |
Stefan Richter | ab71c6f | 2007-06-17 11:02:12 +0200 | [diff] [blame] | 1205 | /* |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 1206 | * __device_release_driver() must be called with @dev lock held. |
| 1207 | * When called for a USB interface, @dev->parent lock must be held as well. |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1208 | */ |
Rafael J. Wysocki | 9ed9895 | 2016-10-30 17:32:16 +0100 | [diff] [blame] | 1209 | static void __device_release_driver(struct device *dev, struct device *parent) |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1210 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1211 | struct device_driver *drv; |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1212 | |
Alan Stern | ef2c517 | 2007-11-16 11:57:28 -0500 | [diff] [blame] | 1213 | drv = dev->driver; |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 1214 | if (drv) { |
Rafael J. Wysocki | 9226c50 | 2020-10-22 17:38:22 +0200 | [diff] [blame] | 1215 | pm_runtime_get_sync(dev); |
| 1216 | |
Rafael J. Wysocki | 9ed9895 | 2016-10-30 17:32:16 +0100 | [diff] [blame] | 1217 | while (device_links_busy(dev)) { |
Alexander Duyck | ed88747 | 2019-01-22 10:39:16 -0800 | [diff] [blame] | 1218 | __device_driver_unlock(dev, parent); |
Rafael J. Wysocki | 9ed9895 | 2016-10-30 17:32:16 +0100 | [diff] [blame] | 1219 | |
| 1220 | device_links_unbind_consumers(dev); |
Rafael J. Wysocki | 9ed9895 | 2016-10-30 17:32:16 +0100 | [diff] [blame] | 1221 | |
Alexander Duyck | ed88747 | 2019-01-22 10:39:16 -0800 | [diff] [blame] | 1222 | __device_driver_lock(dev, parent); |
Rafael J. Wysocki | 9ed9895 | 2016-10-30 17:32:16 +0100 | [diff] [blame] | 1223 | /* |
| 1224 | * A concurrent invocation of the same function might |
| 1225 | * have released the driver successfully while this one |
| 1226 | * was waiting, so check for that. |
| 1227 | */ |
Rafael J. Wysocki | 9226c50 | 2020-10-22 17:38:22 +0200 | [diff] [blame] | 1228 | if (dev->driver != drv) { |
| 1229 | pm_runtime_put(dev); |
Rafael J. Wysocki | 9ed9895 | 2016-10-30 17:32:16 +0100 | [diff] [blame] | 1230 | return; |
Rafael J. Wysocki | 9226c50 | 2020-10-22 17:38:22 +0200 | [diff] [blame] | 1231 | } |
Rafael J. Wysocki | 9ed9895 | 2016-10-30 17:32:16 +0100 | [diff] [blame] | 1232 | } |
| 1233 | |
Kay Sievers | 1901fb2 | 2006-10-07 21:55:55 +0200 | [diff] [blame] | 1234 | driver_sysfs_remove(dev); |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 1235 | |
Greg Kroah-Hartman | ed9f918 | 2023-01-11 10:23:31 +0100 | [diff] [blame] | 1236 | bus_notify(dev, BUS_NOTIFY_UNBIND_DRIVER); |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 1237 | |
Rafael J. Wysocki | baab52d | 2013-11-07 01:51:15 +0100 | [diff] [blame] | 1238 | pm_runtime_put_sync(dev); |
Rafael J. Wysocki | e1866b3 | 2011-04-29 00:33:45 +0200 | [diff] [blame] | 1239 | |
Rob Herring | 4b775aa | 2022-02-23 16:52:57 -0600 | [diff] [blame] | 1240 | device_remove(dev); |
Rafael J. Wysocki | 9ed9895 | 2016-10-30 17:32:16 +0100 | [diff] [blame] | 1241 | |
Lu Baolu | 25f3bcf | 2022-04-18 08:49:51 +0800 | [diff] [blame] | 1242 | if (dev->bus && dev->bus->dma_cleanup) |
| 1243 | dev->bus->dma_cleanup(dev); |
| 1244 | |
Rafael J. Wysocki | 9ed9895 | 2016-10-30 17:32:16 +0100 | [diff] [blame] | 1245 | device_links_driver_cleanup(dev); |
Rob Herring | 9ad3072 | 2022-02-23 16:52:56 -0600 | [diff] [blame] | 1246 | device_unbind_cleanup(dev); |
Rafael J. Wysocki | e90d553 | 2015-03-20 13:59:27 +0100 | [diff] [blame] | 1247 | |
Greg Kroah-Hartman | 8940b4f | 2008-12-16 12:25:49 -0800 | [diff] [blame] | 1248 | klist_remove(&dev->p->knode_driver); |
Tomeu Vizoso | aa8e54b5 | 2016-01-07 16:46:14 +0100 | [diff] [blame] | 1249 | device_pm_check_callbacks(dev); |
Dmitry Torokhov | 1455cf8 | 2017-07-19 17:24:30 -0700 | [diff] [blame] | 1250 | |
Greg Kroah-Hartman | ed9f918 | 2023-01-11 10:23:31 +0100 | [diff] [blame] | 1251 | bus_notify(dev, BUS_NOTIFY_UNBOUND_DRIVER); |
Dmitry Torokhov | 1455cf8 | 2017-07-19 17:24:30 -0700 | [diff] [blame] | 1252 | kobject_uevent(&dev->kobj, KOBJ_UNBIND); |
Patrick Mochel | 0d3e5a2 | 2005-04-05 23:46:33 -0700 | [diff] [blame] | 1253 | } |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 1254 | } |
| 1255 | |
Rafael J. Wysocki | 9ed9895 | 2016-10-30 17:32:16 +0100 | [diff] [blame] | 1256 | void device_release_driver_internal(struct device *dev, |
| 1257 | struct device_driver *drv, |
| 1258 | struct device *parent) |
Rafael J. Wysocki | 4bdb355 | 2016-10-10 14:37:56 +0200 | [diff] [blame] | 1259 | { |
Alexander Duyck | ed88747 | 2019-01-22 10:39:16 -0800 | [diff] [blame] | 1260 | __device_driver_lock(dev, parent); |
Rafael J. Wysocki | 4bdb355 | 2016-10-10 14:37:56 +0200 | [diff] [blame] | 1261 | |
Rafael J. Wysocki | 4bdb355 | 2016-10-10 14:37:56 +0200 | [diff] [blame] | 1262 | if (!drv || drv == dev->driver) |
Rafael J. Wysocki | 9ed9895 | 2016-10-30 17:32:16 +0100 | [diff] [blame] | 1263 | __device_release_driver(dev, parent); |
Rafael J. Wysocki | 4bdb355 | 2016-10-10 14:37:56 +0200 | [diff] [blame] | 1264 | |
Alexander Duyck | ed88747 | 2019-01-22 10:39:16 -0800 | [diff] [blame] | 1265 | __device_driver_unlock(dev, parent); |
Rafael J. Wysocki | 4bdb355 | 2016-10-10 14:37:56 +0200 | [diff] [blame] | 1266 | } |
| 1267 | |
Stefan Richter | ab71c6f | 2007-06-17 11:02:12 +0200 | [diff] [blame] | 1268 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1269 | * device_release_driver - manually detach device from driver. |
| 1270 | * @dev: device. |
Stefan Richter | ab71c6f | 2007-06-17 11:02:12 +0200 | [diff] [blame] | 1271 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1272 | * Manually detach device from driver. |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 1273 | * When called for a USB interface, @dev->parent lock must be held. |
Rafael J. Wysocki | 9ed9895 | 2016-10-30 17:32:16 +0100 | [diff] [blame] | 1274 | * |
| 1275 | * If this function is to be called with @dev->parent lock held, ensure that |
| 1276 | * the device's consumers are unbound in advance or that their locks can be |
| 1277 | * acquired under the @dev->parent lock. |
Stefan Richter | ab71c6f | 2007-06-17 11:02:12 +0200 | [diff] [blame] | 1278 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1279 | void device_release_driver(struct device *dev) |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 1280 | { |
| 1281 | /* |
| 1282 | * If anyone calls device_release_driver() recursively from |
| 1283 | * within their ->remove callback for the same device, they |
| 1284 | * will deadlock right here. |
| 1285 | */ |
Rafael J. Wysocki | 4bdb355 | 2016-10-10 14:37:56 +0200 | [diff] [blame] | 1286 | device_release_driver_internal(dev, NULL, NULL); |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1287 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1288 | EXPORT_SYMBOL_GPL(device_release_driver); |
mochel@digitalimplant.org | 94e7b1c5 | 2005-03-21 12:25:36 -0800 | [diff] [blame] | 1289 | |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1290 | /** |
Alexander Duyck | ed88747 | 2019-01-22 10:39:16 -0800 | [diff] [blame] | 1291 | * device_driver_detach - detach driver from a specific device |
| 1292 | * @dev: device to detach driver from |
| 1293 | * |
| 1294 | * Detach driver from device. Will acquire both @dev lock and @dev->parent |
| 1295 | * lock if needed. |
| 1296 | */ |
| 1297 | void device_driver_detach(struct device *dev) |
| 1298 | { |
| 1299 | device_release_driver_internal(dev, NULL, dev->parent); |
| 1300 | } |
| 1301 | |
| 1302 | /** |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1303 | * driver_detach - detach driver from all devices it controls. |
| 1304 | * @drv: driver. |
| 1305 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1306 | void driver_detach(struct device_driver *drv) |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1307 | { |
Greg Kroah-Hartman | 8940b4f | 2008-12-16 12:25:49 -0800 | [diff] [blame] | 1308 | struct device_private *dev_prv; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1309 | struct device *dev; |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 1310 | |
Alexander Duyck | c37d721 | 2018-11-28 16:32:11 -0800 | [diff] [blame] | 1311 | if (driver_allows_async_probing(drv)) |
| 1312 | async_synchronize_full(); |
| 1313 | |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 1314 | for (;;) { |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 1315 | spin_lock(&drv->p->klist_devices.k_lock); |
| 1316 | if (list_empty(&drv->p->klist_devices.k_list)) { |
| 1317 | spin_unlock(&drv->p->klist_devices.k_lock); |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 1318 | break; |
| 1319 | } |
Andy Shevchenko | a3a87d6 | 2020-03-24 14:20:23 +0200 | [diff] [blame] | 1320 | dev_prv = list_last_entry(&drv->p->klist_devices.k_list, |
Greg Kroah-Hartman | 8940b4f | 2008-12-16 12:25:49 -0800 | [diff] [blame] | 1321 | struct device_private, |
| 1322 | knode_driver.n_node); |
| 1323 | dev = dev_prv->device; |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 1324 | get_device(dev); |
Greg Kroah-Hartman | e5dd127 | 2007-11-28 15:59:15 -0800 | [diff] [blame] | 1325 | spin_unlock(&drv->p->klist_devices.k_lock); |
Rafael J. Wysocki | 4bdb355 | 2016-10-10 14:37:56 +0200 | [diff] [blame] | 1326 | device_release_driver_internal(dev, drv, dev->parent); |
Alan Stern | c95a6b0 | 2005-05-06 15:38:33 -0400 | [diff] [blame] | 1327 | put_device(dev); |
| 1328 | } |
mochel@digitalimplant.org | 07e4a3e | 2005-03-21 10:52:54 -0800 | [diff] [blame] | 1329 | } |