Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * hosts.c Copyright (C) 1992 Drew Eckhardt |
| 3 | * Copyright (C) 1993, 1994, 1995 Eric Youngdale |
| 4 | * Copyright (C) 2002-2003 Christoph Hellwig |
| 5 | * |
| 6 | * mid to lowlevel SCSI driver interface |
| 7 | * Initial versions: Drew Eckhardt |
| 8 | * Subsequent revisions: Eric Youngdale |
| 9 | * |
| 10 | * <drew@colorado.edu> |
| 11 | * |
| 12 | * Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli |
| 13 | * Added QLOGIC QLA1280 SCSI controller kernel host support. |
| 14 | * August 4, 1999 Fred Lewis, Intel DuPont |
| 15 | * |
| 16 | * Updated to reflect the new initialization scheme for the higher |
| 17 | * level of scsi drivers (sd/sr/st) |
| 18 | * September 17, 2000 Torben Mathiasen <tmm@image.dk> |
| 19 | * |
| 20 | * Restructured scsi_host lists and associated functions. |
| 21 | * September 04, 2002 Mike Anderson (andmike@us.ibm.com) |
| 22 | */ |
| 23 | |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/blkdev.h> |
| 26 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 27 | #include <linux/slab.h> |
Christoph Hellwig | c5478de | 2005-09-06 14:04:26 +0200 | [diff] [blame] | 28 | #include <linux/kthread.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/string.h> |
| 30 | #include <linux/mm.h> |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/completion.h> |
| 33 | #include <linux/transport_class.h> |
Russell King | d052d1b | 2005-10-29 19:07:23 +0100 | [diff] [blame] | 34 | #include <linux/platform_device.h> |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 35 | #include <linux/pm_runtime.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | #include <scsi/scsi_device.h> |
| 38 | #include <scsi/scsi_host.h> |
| 39 | #include <scsi/scsi_transport.h> |
| 40 | |
| 41 | #include "scsi_priv.h" |
| 42 | #include "scsi_logging.h" |
| 43 | |
| 44 | |
Joe Eykholt | 30c9afa | 2009-06-15 23:22:14 -0700 | [diff] [blame] | 45 | static atomic_t scsi_host_next_hn; /* host_no for next new host */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
| 47 | |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 48 | static void scsi_host_cls_release(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | { |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 50 | put_device(&class_to_shost(dev)->shost_gendev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | } |
| 52 | |
| 53 | static struct class shost_class = { |
| 54 | .name = "scsi_host", |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 55 | .dev_release = scsi_host_cls_release, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | }; |
| 57 | |
| 58 | /** |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 59 | * scsi_host_set_state - Take the given host through the host state model. |
Mike Anderson | d330187 | 2005-06-16 11:12:38 -0700 | [diff] [blame] | 60 | * @shost: scsi host to change the state of. |
| 61 | * @state: state to change to. |
| 62 | * |
| 63 | * Returns zero if unsuccessful or an error if the requested |
| 64 | * transition is illegal. |
| 65 | **/ |
| 66 | int scsi_host_set_state(struct Scsi_Host *shost, enum scsi_host_state state) |
| 67 | { |
| 68 | enum scsi_host_state oldstate = shost->shost_state; |
| 69 | |
| 70 | if (state == oldstate) |
| 71 | return 0; |
| 72 | |
| 73 | switch (state) { |
| 74 | case SHOST_CREATED: |
| 75 | /* There are no legal states that come back to |
| 76 | * created. This is the manually initialised start |
| 77 | * state */ |
| 78 | goto illegal; |
| 79 | |
| 80 | case SHOST_RUNNING: |
| 81 | switch (oldstate) { |
| 82 | case SHOST_CREATED: |
| 83 | case SHOST_RECOVERY: |
| 84 | break; |
| 85 | default: |
| 86 | goto illegal; |
| 87 | } |
| 88 | break; |
| 89 | |
| 90 | case SHOST_RECOVERY: |
| 91 | switch (oldstate) { |
| 92 | case SHOST_RUNNING: |
| 93 | break; |
| 94 | default: |
| 95 | goto illegal; |
| 96 | } |
| 97 | break; |
| 98 | |
| 99 | case SHOST_CANCEL: |
| 100 | switch (oldstate) { |
| 101 | case SHOST_CREATED: |
| 102 | case SHOST_RUNNING: |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 103 | case SHOST_CANCEL_RECOVERY: |
Mike Anderson | d330187 | 2005-06-16 11:12:38 -0700 | [diff] [blame] | 104 | break; |
| 105 | default: |
| 106 | goto illegal; |
| 107 | } |
| 108 | break; |
| 109 | |
| 110 | case SHOST_DEL: |
| 111 | switch (oldstate) { |
| 112 | case SHOST_CANCEL: |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 113 | case SHOST_DEL_RECOVERY: |
Mike Anderson | d330187 | 2005-06-16 11:12:38 -0700 | [diff] [blame] | 114 | break; |
| 115 | default: |
| 116 | goto illegal; |
| 117 | } |
| 118 | break; |
| 119 | |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 120 | case SHOST_CANCEL_RECOVERY: |
| 121 | switch (oldstate) { |
| 122 | case SHOST_CANCEL: |
| 123 | case SHOST_RECOVERY: |
| 124 | break; |
| 125 | default: |
| 126 | goto illegal; |
| 127 | } |
| 128 | break; |
| 129 | |
| 130 | case SHOST_DEL_RECOVERY: |
| 131 | switch (oldstate) { |
| 132 | case SHOST_CANCEL_RECOVERY: |
| 133 | break; |
| 134 | default: |
| 135 | goto illegal; |
| 136 | } |
| 137 | break; |
Mike Anderson | d330187 | 2005-06-16 11:12:38 -0700 | [diff] [blame] | 138 | } |
| 139 | shost->shost_state = state; |
| 140 | return 0; |
| 141 | |
| 142 | illegal: |
| 143 | SCSI_LOG_ERROR_RECOVERY(1, |
James Bottomley | 9ccfc75 | 2005-10-02 11:45:08 -0500 | [diff] [blame] | 144 | shost_printk(KERN_ERR, shost, |
| 145 | "Illegal host state transition" |
| 146 | "%s->%s\n", |
| 147 | scsi_host_state_name(oldstate), |
| 148 | scsi_host_state_name(state))); |
Mike Anderson | d330187 | 2005-06-16 11:12:38 -0700 | [diff] [blame] | 149 | return -EINVAL; |
| 150 | } |
| 151 | EXPORT_SYMBOL(scsi_host_set_state); |
| 152 | |
| 153 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | * scsi_remove_host - remove a scsi host |
| 155 | * @shost: a pointer to a scsi host to remove |
| 156 | **/ |
| 157 | void scsi_remove_host(struct Scsi_Host *shost) |
| 158 | { |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 159 | unsigned long flags; |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 160 | |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 161 | mutex_lock(&shost->scan_mutex); |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 162 | spin_lock_irqsave(shost->host_lock, flags); |
| 163 | if (scsi_host_set_state(shost, SHOST_CANCEL)) |
| 164 | if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) { |
| 165 | spin_unlock_irqrestore(shost->host_lock, flags); |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 166 | mutex_unlock(&shost->scan_mutex); |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 167 | return; |
| 168 | } |
| 169 | spin_unlock_irqrestore(shost->host_lock, flags); |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 170 | |
| 171 | scsi_autopm_get_host(shost); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | scsi_forget_host(shost); |
Alexey Kuznetsov | 4e46bf8 | 2009-11-17 14:10:11 -0800 | [diff] [blame] | 173 | mutex_unlock(&shost->scan_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | scsi_proc_host_rm(shost); |
| 175 | |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 176 | spin_lock_irqsave(shost->host_lock, flags); |
| 177 | if (scsi_host_set_state(shost, SHOST_DEL)) |
| 178 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL_RECOVERY)); |
| 179 | spin_unlock_irqrestore(shost->host_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
| 181 | transport_unregister_device(&shost->shost_gendev); |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 182 | device_unregister(&shost->shost_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | device_del(&shost->shost_gendev); |
| 184 | } |
| 185 | EXPORT_SYMBOL(scsi_remove_host); |
| 186 | |
| 187 | /** |
James Bottomley | d139b9b | 2009-11-05 13:33:12 -0600 | [diff] [blame] | 188 | * scsi_add_host_with_dma - add a scsi host with dma device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | * @shost: scsi host pointer to add |
| 190 | * @dev: a struct device of type scsi class |
James Bottomley | d139b9b | 2009-11-05 13:33:12 -0600 | [diff] [blame] | 191 | * @dma_dev: dma device for the host |
| 192 | * |
| 193 | * Note: You rarely need to worry about this unless you're in a |
| 194 | * virtualised host environments, so use the simpler scsi_add_host() |
| 195 | * function instead. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | * |
| 197 | * Return value: |
| 198 | * 0 on success / != 0 for error |
| 199 | **/ |
James Bottomley | d139b9b | 2009-11-05 13:33:12 -0600 | [diff] [blame] | 200 | int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev, |
| 201 | struct device *dma_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | { |
| 203 | struct scsi_host_template *sht = shost->hostt; |
| 204 | int error = -EINVAL; |
| 205 | |
| 206 | printk(KERN_INFO "scsi%d : %s\n", shost->host_no, |
| 207 | sht->info ? sht->info(shost) : sht->name); |
| 208 | |
| 209 | if (!shost->can_queue) { |
| 210 | printk(KERN_ERR "%s: can_queue = 0 no longer supported\n", |
| 211 | sht->name); |
James Bottomley | 542bd13 | 2008-04-21 10:57:20 -0500 | [diff] [blame] | 212 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | } |
| 214 | |
James Bottomley | 542bd13 | 2008-04-21 10:57:20 -0500 | [diff] [blame] | 215 | error = scsi_setup_command_freelist(shost); |
| 216 | if (error) |
| 217 | goto fail; |
| 218 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | if (!shost->shost_gendev.parent) |
| 220 | shost->shost_gendev.parent = dev ? dev : &platform_bus; |
James Bottomley | 3c8d9a9 | 2012-05-04 09:40:04 +0000 | [diff] [blame] | 221 | if (!dma_dev) |
| 222 | dma_dev = shost->shost_gendev.parent; |
| 223 | |
James Bottomley | d139b9b | 2009-11-05 13:33:12 -0600 | [diff] [blame] | 224 | shost->dma_dev = dma_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | |
| 226 | error = device_add(&shost->shost_gendev); |
| 227 | if (error) |
| 228 | goto out; |
| 229 | |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 230 | pm_runtime_set_active(&shost->shost_gendev); |
| 231 | pm_runtime_enable(&shost->shost_gendev); |
| 232 | device_enable_async_suspend(&shost->shost_gendev); |
| 233 | |
Mike Anderson | d330187 | 2005-06-16 11:12:38 -0700 | [diff] [blame] | 234 | scsi_host_set_state(shost, SHOST_RUNNING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | get_device(shost->shost_gendev.parent); |
| 236 | |
Rafael J. Wysocki | 4cb077d | 2010-02-08 19:18:26 +0100 | [diff] [blame] | 237 | device_enable_async_suspend(&shost->shost_dev); |
| 238 | |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 239 | error = device_add(&shost->shost_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | if (error) |
| 241 | goto out_del_gendev; |
| 242 | |
| 243 | get_device(&shost->shost_gendev); |
| 244 | |
James Smart | 77cca46 | 2008-03-21 17:18:23 -0400 | [diff] [blame] | 245 | if (shost->transportt->host_size) { |
| 246 | shost->shost_data = kzalloc(shost->transportt->host_size, |
| 247 | GFP_KERNEL); |
| 248 | if (shost->shost_data == NULL) { |
| 249 | error = -ENOMEM; |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 250 | goto out_del_dev; |
James Smart | 77cca46 | 2008-03-21 17:18:23 -0400 | [diff] [blame] | 251 | } |
| 252 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
| 254 | if (shost->transportt->create_work_queue) { |
Kay Sievers | aab0de2 | 2008-05-02 06:02:41 +0200 | [diff] [blame] | 255 | snprintf(shost->work_q_name, sizeof(shost->work_q_name), |
| 256 | "scsi_wq_%d", shost->host_no); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | shost->work_q = create_singlethread_workqueue( |
| 258 | shost->work_q_name); |
James Smart | 77cca46 | 2008-03-21 17:18:23 -0400 | [diff] [blame] | 259 | if (!shost->work_q) { |
| 260 | error = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | goto out_free_shost_data; |
James Smart | 77cca46 | 2008-03-21 17:18:23 -0400 | [diff] [blame] | 262 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | } |
| 264 | |
| 265 | error = scsi_sysfs_add_host(shost); |
| 266 | if (error) |
| 267 | goto out_destroy_host; |
| 268 | |
| 269 | scsi_proc_host_add(shost); |
| 270 | return error; |
| 271 | |
| 272 | out_destroy_host: |
| 273 | if (shost->work_q) |
| 274 | destroy_workqueue(shost->work_q); |
| 275 | out_free_shost_data: |
| 276 | kfree(shost->shost_data); |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 277 | out_del_dev: |
| 278 | device_del(&shost->shost_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | out_del_gendev: |
| 280 | device_del(&shost->shost_gendev); |
| 281 | out: |
James Bottomley | 542bd13 | 2008-04-21 10:57:20 -0500 | [diff] [blame] | 282 | scsi_destroy_command_freelist(shost); |
| 283 | fail: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | return error; |
| 285 | } |
James Bottomley | d139b9b | 2009-11-05 13:33:12 -0600 | [diff] [blame] | 286 | EXPORT_SYMBOL(scsi_add_host_with_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | |
| 288 | static void scsi_host_dev_release(struct device *dev) |
| 289 | { |
| 290 | struct Scsi_Host *shost = dev_to_shost(dev); |
| 291 | struct device *parent = dev->parent; |
Bart Van Assche | 3308511 | 2011-09-23 19:48:18 +0200 | [diff] [blame] | 292 | struct request_queue *q; |
Bart Van Assche | e9a60ec | 2012-06-29 15:33:22 +0000 | [diff] [blame] | 293 | void *queuedata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | |
Alan Stern | 77c0197 | 2009-02-27 16:51:42 -0500 | [diff] [blame] | 295 | scsi_proc_hostdir_rm(shost->hostt); |
| 296 | |
Christoph Hellwig | c5478de | 2005-09-06 14:04:26 +0200 | [diff] [blame] | 297 | if (shost->ehandler) |
| 298 | kthread_stop(shost->ehandler); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | if (shost->work_q) |
| 300 | destroy_workqueue(shost->work_q); |
Bart Van Assche | 3308511 | 2011-09-23 19:48:18 +0200 | [diff] [blame] | 301 | q = shost->uspace_req_q; |
| 302 | if (q) { |
Bart Van Assche | e9a60ec | 2012-06-29 15:33:22 +0000 | [diff] [blame] | 303 | queuedata = q->queuedata; |
| 304 | blk_cleanup_queue(q); |
| 305 | kfree(queuedata); |
FUJITA Tomonori | b58d915 | 2006-11-16 19:24:10 +0900 | [diff] [blame] | 306 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | scsi_destroy_command_freelist(shost); |
James Bottomley | 86e33a2 | 2006-08-30 09:45:51 -0400 | [diff] [blame] | 309 | if (shost->bqt) |
| 310 | blk_free_tags(shost->bqt); |
| 311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | kfree(shost->shost_data); |
| 313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | if (parent) |
| 315 | put_device(parent); |
| 316 | kfree(shost); |
| 317 | } |
| 318 | |
Adrian Bunk | 453cd0f | 2008-07-03 23:47:33 -0700 | [diff] [blame] | 319 | static struct device_type scsi_host_type = { |
Hannes Reinecke | b0ed433 | 2008-03-18 14:32:28 +0100 | [diff] [blame] | 320 | .name = "scsi_host", |
| 321 | .release = scsi_host_dev_release, |
| 322 | }; |
| 323 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | /** |
| 325 | * scsi_host_alloc - register a scsi host adapter instance. |
| 326 | * @sht: pointer to scsi host template |
| 327 | * @privsize: extra bytes to allocate for driver |
| 328 | * |
| 329 | * Note: |
| 330 | * Allocate a new Scsi_Host and perform basic initialization. |
| 331 | * The host is not published to the scsi midlayer until scsi_add_host |
| 332 | * is called. |
| 333 | * |
| 334 | * Return value: |
| 335 | * Pointer to a new Scsi_Host |
| 336 | **/ |
| 337 | struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize) |
| 338 | { |
| 339 | struct Scsi_Host *shost; |
Al Viro | c53033f | 2005-10-21 03:22:08 -0400 | [diff] [blame] | 340 | gfp_t gfp_mask = GFP_KERNEL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | |
| 342 | if (sht->unchecked_isa_dma && privsize) |
| 343 | gfp_mask |= __GFP_DMA; |
| 344 | |
Jes Sorensen | 24669f75 | 2006-01-16 10:31:18 -0500 | [diff] [blame] | 345 | shost = kzalloc(sizeof(struct Scsi_Host) + privsize, gfp_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | if (!shost) |
| 347 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | |
Christoph Hellwig | 4f777ed | 2006-11-04 20:11:36 +0100 | [diff] [blame] | 349 | shost->host_lock = &shost->default_lock; |
| 350 | spin_lock_init(shost->host_lock); |
Mike Anderson | d330187 | 2005-06-16 11:12:38 -0700 | [diff] [blame] | 351 | shost->shost_state = SHOST_CREATED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | INIT_LIST_HEAD(&shost->__devices); |
| 353 | INIT_LIST_HEAD(&shost->__targets); |
| 354 | INIT_LIST_HEAD(&shost->eh_cmd_q); |
| 355 | INIT_LIST_HEAD(&shost->starved_list); |
| 356 | init_waitqueue_head(&shost->host_wait); |
| 357 | |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 358 | mutex_init(&shost->scan_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
Joe Eykholt | 30c9afa | 2009-06-15 23:22:14 -0700 | [diff] [blame] | 360 | /* |
| 361 | * subtract one because we increment first then return, but we need to |
| 362 | * know what the next host number was before increment |
| 363 | */ |
| 364 | shost->host_no = atomic_inc_return(&scsi_host_next_hn) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | shost->dma_channel = 0xff; |
| 366 | |
| 367 | /* These three are default values which can be overridden */ |
| 368 | shost->max_channel = 0; |
| 369 | shost->max_id = 8; |
| 370 | shost->max_lun = 8; |
| 371 | |
| 372 | /* Give each shost a default transportt */ |
| 373 | shost->transportt = &blank_transport_template; |
| 374 | |
| 375 | /* |
| 376 | * All drivers right now should be able to handle 12 byte |
| 377 | * commands. Every so often there are requests for 16 byte |
| 378 | * commands, but individual low-level drivers need to certify that |
| 379 | * they actually do something sensible with such commands. |
| 380 | */ |
| 381 | shost->max_cmd_len = 12; |
| 382 | shost->hostt = sht; |
| 383 | shost->this_id = sht->this_id; |
| 384 | shost->can_queue = sht->can_queue; |
| 385 | shost->sg_tablesize = sht->sg_tablesize; |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 386 | shost->sg_prot_tablesize = sht->sg_prot_tablesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | shost->cmd_per_lun = sht->cmd_per_lun; |
| 388 | shost->unchecked_isa_dma = sht->unchecked_isa_dma; |
| 389 | shost->use_clustering = sht->use_clustering; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | shost->ordered_tag = sht->ordered_tag; |
| 391 | |
James Bottomley | 7a39ac3 | 2007-09-25 22:45:53 -0500 | [diff] [blame] | 392 | if (sht->supported_mode == MODE_UNKNOWN) |
| 393 | /* means we didn't set it ... default to INITIATOR */ |
| 394 | shost->active_mode = MODE_INITIATOR; |
| 395 | else |
| 396 | shost->active_mode = sht->supported_mode; |
| 397 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | if (sht->max_host_blocked) |
| 399 | shost->max_host_blocked = sht->max_host_blocked; |
| 400 | else |
| 401 | shost->max_host_blocked = SCSI_DEFAULT_HOST_BLOCKED; |
| 402 | |
| 403 | /* |
| 404 | * If the driver imposes no hard sector transfer limit, start at |
| 405 | * machine infinity initially. |
| 406 | */ |
| 407 | if (sht->max_sectors) |
| 408 | shost->max_sectors = sht->max_sectors; |
| 409 | else |
| 410 | shost->max_sectors = SCSI_DEFAULT_MAX_SECTORS; |
| 411 | |
| 412 | /* |
| 413 | * assume a 4GB boundary, if not set |
| 414 | */ |
| 415 | if (sht->dma_boundary) |
| 416 | shost->dma_boundary = sht->dma_boundary; |
| 417 | else |
| 418 | shost->dma_boundary = 0xffffffff; |
| 419 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | device_initialize(&shost->shost_gendev); |
Kay Sievers | 71610f5 | 2008-12-03 22:41:36 +0100 | [diff] [blame] | 421 | dev_set_name(&shost->shost_gendev, "host%d", shost->host_no); |
Hannes Reinecke | b0ed433 | 2008-03-18 14:32:28 +0100 | [diff] [blame] | 422 | shost->shost_gendev.bus = &scsi_bus_type; |
Hannes Reinecke | b0ed433 | 2008-03-18 14:32:28 +0100 | [diff] [blame] | 423 | shost->shost_gendev.type = &scsi_host_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 425 | device_initialize(&shost->shost_dev); |
| 426 | shost->shost_dev.parent = &shost->shost_gendev; |
| 427 | shost->shost_dev.class = &shost_class; |
Kay Sievers | 71610f5 | 2008-12-03 22:41:36 +0100 | [diff] [blame] | 428 | dev_set_name(&shost->shost_dev, "host%d", shost->host_no); |
Hannes Reinecke | f7120a4 | 2008-03-18 14:32:28 +0100 | [diff] [blame] | 429 | shost->shost_dev.groups = scsi_sysfs_shost_attr_groups; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
Christoph Hellwig | c5478de | 2005-09-06 14:04:26 +0200 | [diff] [blame] | 431 | shost->ehandler = kthread_run(scsi_error_handler, shost, |
| 432 | "scsi_eh_%d", shost->host_no); |
| 433 | if (IS_ERR(shost->ehandler)) { |
Justin P. Mattock | e4bf25f | 2010-06-18 13:16:07 -0700 | [diff] [blame] | 434 | printk(KERN_WARNING "scsi%d: error handler thread failed to spawn, error = %ld\n", |
| 435 | shost->host_no, PTR_ERR(shost->ehandler)); |
James Bottomley | 542bd13 | 2008-04-21 10:57:20 -0500 | [diff] [blame] | 436 | goto fail_kfree; |
Christoph Hellwig | c5478de | 2005-09-06 14:04:26 +0200 | [diff] [blame] | 437 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
| 439 | scsi_proc_hostdir_add(shost->hostt); |
| 440 | return shost; |
| 441 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | fail_kfree: |
| 443 | kfree(shost); |
| 444 | return NULL; |
| 445 | } |
| 446 | EXPORT_SYMBOL(scsi_host_alloc); |
| 447 | |
| 448 | struct Scsi_Host *scsi_register(struct scsi_host_template *sht, int privsize) |
| 449 | { |
| 450 | struct Scsi_Host *shost = scsi_host_alloc(sht, privsize); |
| 451 | |
| 452 | if (!sht->detect) { |
| 453 | printk(KERN_WARNING "scsi_register() called on new-style " |
| 454 | "template for driver %s\n", sht->name); |
| 455 | dump_stack(); |
| 456 | } |
| 457 | |
| 458 | if (shost) |
| 459 | list_add_tail(&shost->sht_legacy_list, &sht->legacy_hosts); |
| 460 | return shost; |
| 461 | } |
| 462 | EXPORT_SYMBOL(scsi_register); |
| 463 | |
| 464 | void scsi_unregister(struct Scsi_Host *shost) |
| 465 | { |
| 466 | list_del(&shost->sht_legacy_list); |
| 467 | scsi_host_put(shost); |
| 468 | } |
| 469 | EXPORT_SYMBOL(scsi_unregister); |
| 470 | |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 471 | static int __scsi_host_match(struct device *dev, void *data) |
Dave Young | 9c77010 | 2008-01-22 14:01:34 +0800 | [diff] [blame] | 472 | { |
| 473 | struct Scsi_Host *p; |
| 474 | unsigned short *hostnum = (unsigned short *)data; |
| 475 | |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 476 | p = class_to_shost(dev); |
Dave Young | 9c77010 | 2008-01-22 14:01:34 +0800 | [diff] [blame] | 477 | return p->host_no == *hostnum; |
| 478 | } |
| 479 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | /** |
| 481 | * scsi_host_lookup - get a reference to a Scsi_Host by host no |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | * @hostnum: host number to locate |
| 483 | * |
| 484 | * Return value: |
| 485 | * A pointer to located Scsi_Host or NULL. |
Mike Christie | 3ed7897 | 2008-06-11 19:21:00 -0500 | [diff] [blame] | 486 | * |
| 487 | * The caller must do a scsi_host_put() to drop the reference |
| 488 | * that scsi_host_get() took. The put_device() below dropped |
| 489 | * the reference from class_find_device(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | **/ |
| 491 | struct Scsi_Host *scsi_host_lookup(unsigned short hostnum) |
| 492 | { |
Tony Jones | ee959b0 | 2008-02-22 00:13:36 +0100 | [diff] [blame] | 493 | struct device *cdev; |
James Smart | 315cb0a | 2008-08-07 20:49:30 -0400 | [diff] [blame] | 494 | struct Scsi_Host *shost = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | |
Greg Kroah-Hartman | 695794a | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 496 | cdev = class_find_device(&shost_class, NULL, &hostnum, |
| 497 | __scsi_host_match); |
Mike Christie | 3ed7897 | 2008-06-11 19:21:00 -0500 | [diff] [blame] | 498 | if (cdev) { |
Dave Young | 9c77010 | 2008-01-22 14:01:34 +0800 | [diff] [blame] | 499 | shost = scsi_host_get(class_to_shost(cdev)); |
Mike Christie | 3ed7897 | 2008-06-11 19:21:00 -0500 | [diff] [blame] | 500 | put_device(cdev); |
| 501 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | return shost; |
| 503 | } |
| 504 | EXPORT_SYMBOL(scsi_host_lookup); |
| 505 | |
| 506 | /** |
| 507 | * scsi_host_get - inc a Scsi_Host ref count |
| 508 | * @shost: Pointer to Scsi_Host to inc. |
| 509 | **/ |
| 510 | struct Scsi_Host *scsi_host_get(struct Scsi_Host *shost) |
| 511 | { |
Mike Anderson | d330187 | 2005-06-16 11:12:38 -0700 | [diff] [blame] | 512 | if ((shost->shost_state == SHOST_DEL) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | !get_device(&shost->shost_gendev)) |
| 514 | return NULL; |
| 515 | return shost; |
| 516 | } |
| 517 | EXPORT_SYMBOL(scsi_host_get); |
| 518 | |
| 519 | /** |
| 520 | * scsi_host_put - dec a Scsi_Host ref count |
| 521 | * @shost: Pointer to Scsi_Host to dec. |
| 522 | **/ |
| 523 | void scsi_host_put(struct Scsi_Host *shost) |
| 524 | { |
| 525 | put_device(&shost->shost_gendev); |
| 526 | } |
| 527 | EXPORT_SYMBOL(scsi_host_put); |
| 528 | |
| 529 | int scsi_init_hosts(void) |
| 530 | { |
| 531 | return class_register(&shost_class); |
| 532 | } |
| 533 | |
| 534 | void scsi_exit_hosts(void) |
| 535 | { |
| 536 | class_unregister(&shost_class); |
| 537 | } |
| 538 | |
| 539 | int scsi_is_host_device(const struct device *dev) |
| 540 | { |
Hannes Reinecke | b0ed433 | 2008-03-18 14:32:28 +0100 | [diff] [blame] | 541 | return dev->type == &scsi_host_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | } |
| 543 | EXPORT_SYMBOL(scsi_is_host_device); |
| 544 | |
| 545 | /** |
| 546 | * scsi_queue_work - Queue work to the Scsi_Host workqueue. |
| 547 | * @shost: Pointer to Scsi_Host. |
| 548 | * @work: Work to queue for execution. |
| 549 | * |
| 550 | * Return value: |
Michael Reed | dd7e2f2 | 2006-08-04 12:09:24 -0500 | [diff] [blame] | 551 | * 1 - work queued for execution |
| 552 | * 0 - work is already queued |
| 553 | * -EINVAL - work queue doesn't exist |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | **/ |
| 555 | int scsi_queue_work(struct Scsi_Host *shost, struct work_struct *work) |
| 556 | { |
| 557 | if (unlikely(!shost->work_q)) { |
| 558 | printk(KERN_ERR |
| 559 | "ERROR: Scsi host '%s' attempted to queue scsi-work, " |
| 560 | "when no workqueue created.\n", shost->hostt->name); |
| 561 | dump_stack(); |
| 562 | |
| 563 | return -EINVAL; |
| 564 | } |
| 565 | |
| 566 | return queue_work(shost->work_q, work); |
| 567 | } |
| 568 | EXPORT_SYMBOL_GPL(scsi_queue_work); |
| 569 | |
| 570 | /** |
| 571 | * scsi_flush_work - Flush a Scsi_Host's workqueue. |
| 572 | * @shost: Pointer to Scsi_Host. |
| 573 | **/ |
| 574 | void scsi_flush_work(struct Scsi_Host *shost) |
| 575 | { |
| 576 | if (!shost->work_q) { |
| 577 | printk(KERN_ERR |
| 578 | "ERROR: Scsi host '%s' attempted to flush scsi-work, " |
| 579 | "when no workqueue created.\n", shost->hostt->name); |
| 580 | dump_stack(); |
| 581 | return; |
| 582 | } |
| 583 | |
| 584 | flush_workqueue(shost->work_q); |
| 585 | } |
| 586 | EXPORT_SYMBOL_GPL(scsi_flush_work); |