James Bottomley | 2908d77 | 2006-08-29 09:22:51 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Serial Attached SCSI (SAS) class SCSI Host glue. |
| 3 | * |
| 4 | * Copyright (C) 2005 Adaptec, Inc. All rights reserved. |
| 5 | * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com> |
| 6 | * |
| 7 | * This file is licensed under GPLv2. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License as |
| 11 | * published by the Free Software Foundation; either version 2 of the |
| 12 | * License, or (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 22 | * USA |
| 23 | * |
| 24 | */ |
| 25 | |
| 26 | #include "sas_internal.h" |
| 27 | |
| 28 | #include <scsi/scsi_host.h> |
| 29 | #include <scsi/scsi_device.h> |
| 30 | #include <scsi/scsi_tcq.h> |
| 31 | #include <scsi/scsi.h> |
Darrick J. Wong | f456393 | 2006-10-30 15:18:39 -0800 | [diff] [blame] | 32 | #include <scsi/scsi_eh.h> |
James Bottomley | 2908d77 | 2006-08-29 09:22:51 -0500 | [diff] [blame] | 33 | #include <scsi/scsi_transport.h> |
| 34 | #include <scsi/scsi_transport_sas.h> |
| 35 | #include "../scsi_sas_internal.h" |
Darrick J. Wong | 79a5eb6 | 2006-10-30 15:18:50 -0800 | [diff] [blame] | 36 | #include "../scsi_transport_api.h" |
James Bottomley | 2908d77 | 2006-08-29 09:22:51 -0500 | [diff] [blame] | 37 | |
| 38 | #include <linux/err.h> |
| 39 | #include <linux/blkdev.h> |
| 40 | #include <linux/scatterlist.h> |
| 41 | |
| 42 | /* ---------- SCSI Host glue ---------- */ |
| 43 | |
| 44 | #define TO_SAS_TASK(_scsi_cmd) ((void *)(_scsi_cmd)->host_scribble) |
| 45 | #define ASSIGN_SAS_TASK(_sc, _t) do { (_sc)->host_scribble = (void *) _t; } while (0) |
| 46 | |
| 47 | static void sas_scsi_task_done(struct sas_task *task) |
| 48 | { |
| 49 | struct task_status_struct *ts = &task->task_status; |
| 50 | struct scsi_cmnd *sc = task->uldd_task; |
Darrick J. Wong | f456393 | 2006-10-30 15:18:39 -0800 | [diff] [blame] | 51 | struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(sc->device->host); |
James Bottomley | 2908d77 | 2006-08-29 09:22:51 -0500 | [diff] [blame] | 52 | unsigned ts_flags = task->task_state_flags; |
| 53 | int hs = 0, stat = 0; |
| 54 | |
| 55 | if (unlikely(!sc)) { |
| 56 | SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n"); |
| 57 | list_del_init(&task->list); |
| 58 | sas_free_task(task); |
| 59 | return; |
| 60 | } |
| 61 | |
| 62 | if (ts->resp == SAS_TASK_UNDELIVERED) { |
| 63 | /* transport error */ |
| 64 | hs = DID_NO_CONNECT; |
| 65 | } else { /* ts->resp == SAS_TASK_COMPLETE */ |
| 66 | /* task delivered, what happened afterwards? */ |
| 67 | switch (ts->stat) { |
| 68 | case SAS_DEV_NO_RESPONSE: |
| 69 | case SAS_INTERRUPTED: |
| 70 | case SAS_PHY_DOWN: |
| 71 | case SAS_NAK_R_ERR: |
| 72 | case SAS_OPEN_TO: |
| 73 | hs = DID_NO_CONNECT; |
| 74 | break; |
| 75 | case SAS_DATA_UNDERRUN: |
| 76 | sc->resid = ts->residual; |
| 77 | if (sc->request_bufflen - sc->resid < sc->underflow) |
| 78 | hs = DID_ERROR; |
| 79 | break; |
| 80 | case SAS_DATA_OVERRUN: |
| 81 | hs = DID_ERROR; |
| 82 | break; |
| 83 | case SAS_QUEUE_FULL: |
| 84 | hs = DID_SOFT_ERROR; /* retry */ |
| 85 | break; |
| 86 | case SAS_DEVICE_UNKNOWN: |
| 87 | hs = DID_BAD_TARGET; |
| 88 | break; |
| 89 | case SAS_SG_ERR: |
| 90 | hs = DID_PARITY; |
| 91 | break; |
| 92 | case SAS_OPEN_REJECT: |
| 93 | if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY) |
| 94 | hs = DID_SOFT_ERROR; /* retry */ |
| 95 | else |
| 96 | hs = DID_ERROR; |
| 97 | break; |
| 98 | case SAS_PROTO_RESPONSE: |
| 99 | SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP " |
| 100 | "task; please report this\n", |
| 101 | task->dev->port->ha->sas_ha_name); |
| 102 | break; |
| 103 | case SAS_ABORTED_TASK: |
| 104 | hs = DID_ABORT; |
| 105 | break; |
| 106 | case SAM_CHECK_COND: |
| 107 | memcpy(sc->sense_buffer, ts->buf, |
| 108 | max(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size)); |
| 109 | stat = SAM_CHECK_COND; |
| 110 | break; |
| 111 | default: |
| 112 | stat = ts->stat; |
| 113 | break; |
| 114 | } |
| 115 | } |
| 116 | ASSIGN_SAS_TASK(sc, NULL); |
| 117 | sc->result = (hs << 16) | stat; |
| 118 | list_del_init(&task->list); |
| 119 | sas_free_task(task); |
| 120 | /* This is very ugly but this is how SCSI Core works. */ |
| 121 | if (ts_flags & SAS_TASK_STATE_ABORTED) |
Darrick J. Wong | f456393 | 2006-10-30 15:18:39 -0800 | [diff] [blame] | 122 | scsi_eh_finish_cmd(sc, &sas_ha->eh_done_q); |
James Bottomley | 2908d77 | 2006-08-29 09:22:51 -0500 | [diff] [blame] | 123 | else |
| 124 | sc->scsi_done(sc); |
| 125 | } |
| 126 | |
| 127 | static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd) |
| 128 | { |
| 129 | enum task_attribute ta = TASK_ATTR_SIMPLE; |
| 130 | if (cmd->request && blk_rq_tagged(cmd->request)) { |
| 131 | if (cmd->device->ordered_tags && |
Jeff Garzik | 1bdfd55 | 2006-09-30 21:28:22 -0400 | [diff] [blame] | 132 | (cmd->request->cmd_flags & REQ_HARDBARRIER)) |
James Bottomley | 2908d77 | 2006-08-29 09:22:51 -0500 | [diff] [blame] | 133 | ta = TASK_ATTR_HOQ; |
| 134 | } |
| 135 | return ta; |
| 136 | } |
| 137 | |
| 138 | static struct sas_task *sas_create_task(struct scsi_cmnd *cmd, |
| 139 | struct domain_device *dev, |
Al Viro | 3cc2754 | 2006-09-25 02:55:40 +0100 | [diff] [blame] | 140 | gfp_t gfp_flags) |
James Bottomley | 2908d77 | 2006-08-29 09:22:51 -0500 | [diff] [blame] | 141 | { |
| 142 | struct sas_task *task = sas_alloc_task(gfp_flags); |
| 143 | struct scsi_lun lun; |
| 144 | |
| 145 | if (!task) |
| 146 | return NULL; |
| 147 | |
| 148 | *(u32 *)cmd->sense_buffer = 0; |
| 149 | task->uldd_task = cmd; |
| 150 | ASSIGN_SAS_TASK(cmd, task); |
| 151 | |
| 152 | task->dev = dev; |
| 153 | task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */ |
| 154 | |
| 155 | task->ssp_task.retry_count = 1; |
| 156 | int_to_scsilun(cmd->device->lun, &lun); |
| 157 | memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8); |
| 158 | task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd); |
| 159 | memcpy(task->ssp_task.cdb, cmd->cmnd, 16); |
| 160 | |
| 161 | task->scatter = cmd->request_buffer; |
| 162 | task->num_scatter = cmd->use_sg; |
| 163 | task->total_xfer_len = cmd->request_bufflen; |
| 164 | task->data_dir = cmd->sc_data_direction; |
| 165 | |
| 166 | task->task_done = sas_scsi_task_done; |
| 167 | |
| 168 | return task; |
| 169 | } |
| 170 | |
| 171 | static int sas_queue_up(struct sas_task *task) |
| 172 | { |
| 173 | struct sas_ha_struct *sas_ha = task->dev->port->ha; |
| 174 | struct scsi_core *core = &sas_ha->core; |
| 175 | unsigned long flags; |
| 176 | LIST_HEAD(list); |
| 177 | |
| 178 | spin_lock_irqsave(&core->task_queue_lock, flags); |
| 179 | if (sas_ha->lldd_queue_size < core->task_queue_size + 1) { |
| 180 | spin_unlock_irqrestore(&core->task_queue_lock, flags); |
| 181 | return -SAS_QUEUE_FULL; |
| 182 | } |
| 183 | list_add_tail(&task->list, &core->task_queue); |
| 184 | core->task_queue_size += 1; |
| 185 | spin_unlock_irqrestore(&core->task_queue_lock, flags); |
| 186 | up(&core->queue_thread_sema); |
| 187 | |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | /** |
| 192 | * sas_queuecommand -- Enqueue a command for processing |
| 193 | * @parameters: See SCSI Core documentation |
| 194 | * |
| 195 | * Note: XXX: Remove the host unlock/lock pair when SCSI Core can |
| 196 | * call us without holding an IRQ spinlock... |
| 197 | */ |
| 198 | int sas_queuecommand(struct scsi_cmnd *cmd, |
| 199 | void (*scsi_done)(struct scsi_cmnd *)) |
| 200 | { |
| 201 | int res = 0; |
| 202 | struct domain_device *dev = cmd_to_domain_dev(cmd); |
| 203 | struct Scsi_Host *host = cmd->device->host; |
| 204 | struct sas_internal *i = to_sas_internal(host->transportt); |
| 205 | |
| 206 | spin_unlock_irq(host->host_lock); |
| 207 | |
| 208 | { |
| 209 | struct sas_ha_struct *sas_ha = dev->port->ha; |
| 210 | struct sas_task *task; |
| 211 | |
| 212 | res = -ENOMEM; |
| 213 | task = sas_create_task(cmd, dev, GFP_ATOMIC); |
| 214 | if (!task) |
| 215 | goto out; |
| 216 | |
| 217 | cmd->scsi_done = scsi_done; |
| 218 | /* Queue up, Direct Mode or Task Collector Mode. */ |
| 219 | if (sas_ha->lldd_max_execute_num < 2) |
| 220 | res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC); |
| 221 | else |
| 222 | res = sas_queue_up(task); |
| 223 | |
| 224 | /* Examine */ |
| 225 | if (res) { |
| 226 | SAS_DPRINTK("lldd_execute_task returned: %d\n", res); |
| 227 | ASSIGN_SAS_TASK(cmd, NULL); |
| 228 | sas_free_task(task); |
| 229 | if (res == -SAS_QUEUE_FULL) { |
| 230 | cmd->result = DID_SOFT_ERROR << 16; /* retry */ |
| 231 | res = 0; |
| 232 | scsi_done(cmd); |
| 233 | } |
| 234 | goto out; |
| 235 | } |
| 236 | } |
| 237 | out: |
| 238 | spin_lock_irq(host->host_lock); |
| 239 | return res; |
| 240 | } |
| 241 | |
| 242 | static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd) |
| 243 | { |
| 244 | struct scsi_cmnd *cmd, *n; |
| 245 | |
| 246 | list_for_each_entry_safe(cmd, n, error_q, eh_entry) { |
| 247 | if (cmd == my_cmd) |
| 248 | list_del_init(&cmd->eh_entry); |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | static void sas_scsi_clear_queue_I_T(struct list_head *error_q, |
| 253 | struct domain_device *dev) |
| 254 | { |
| 255 | struct scsi_cmnd *cmd, *n; |
| 256 | |
| 257 | list_for_each_entry_safe(cmd, n, error_q, eh_entry) { |
| 258 | struct domain_device *x = cmd_to_domain_dev(cmd); |
| 259 | |
| 260 | if (x == dev) |
| 261 | list_del_init(&cmd->eh_entry); |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | static void sas_scsi_clear_queue_port(struct list_head *error_q, |
| 266 | struct asd_sas_port *port) |
| 267 | { |
| 268 | struct scsi_cmnd *cmd, *n; |
| 269 | |
| 270 | list_for_each_entry_safe(cmd, n, error_q, eh_entry) { |
| 271 | struct domain_device *dev = cmd_to_domain_dev(cmd); |
| 272 | struct asd_sas_port *x = dev->port; |
| 273 | |
| 274 | if (x == port) |
| 275 | list_del_init(&cmd->eh_entry); |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | enum task_disposition { |
| 280 | TASK_IS_DONE, |
| 281 | TASK_IS_ABORTED, |
| 282 | TASK_IS_AT_LU, |
| 283 | TASK_IS_NOT_AT_LU, |
| 284 | }; |
| 285 | |
| 286 | static enum task_disposition sas_scsi_find_task(struct sas_task *task) |
| 287 | { |
| 288 | struct sas_ha_struct *ha = task->dev->port->ha; |
| 289 | unsigned long flags; |
| 290 | int i, res; |
| 291 | struct sas_internal *si = |
| 292 | to_sas_internal(task->dev->port->ha->core.shost->transportt); |
| 293 | |
| 294 | if (ha->lldd_max_execute_num > 1) { |
| 295 | struct scsi_core *core = &ha->core; |
| 296 | struct sas_task *t, *n; |
| 297 | |
| 298 | spin_lock_irqsave(&core->task_queue_lock, flags); |
| 299 | list_for_each_entry_safe(t, n, &core->task_queue, list) { |
| 300 | if (task == t) { |
| 301 | list_del_init(&t->list); |
| 302 | spin_unlock_irqrestore(&core->task_queue_lock, |
| 303 | flags); |
| 304 | SAS_DPRINTK("%s: task 0x%p aborted from " |
| 305 | "task_queue\n", |
| 306 | __FUNCTION__, task); |
| 307 | return TASK_IS_ABORTED; |
| 308 | } |
| 309 | } |
| 310 | spin_unlock_irqrestore(&core->task_queue_lock, flags); |
| 311 | } |
| 312 | |
Darrick J. Wong | f456393 | 2006-10-30 15:18:39 -0800 | [diff] [blame] | 313 | spin_lock_irqsave(&task->task_state_lock, flags); |
| 314 | if (task->task_state_flags & SAS_TASK_INITIATOR_ABORTED) { |
| 315 | spin_unlock_irqrestore(&task->task_state_lock, flags); |
| 316 | SAS_DPRINTK("%s: task 0x%p already aborted\n", |
| 317 | __FUNCTION__, task); |
| 318 | return TASK_IS_ABORTED; |
| 319 | } |
| 320 | spin_unlock_irqrestore(&task->task_state_lock, flags); |
| 321 | |
James Bottomley | 2908d77 | 2006-08-29 09:22:51 -0500 | [diff] [blame] | 322 | for (i = 0; i < 5; i++) { |
| 323 | SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task); |
| 324 | res = si->dft->lldd_abort_task(task); |
| 325 | |
| 326 | spin_lock_irqsave(&task->task_state_lock, flags); |
| 327 | if (task->task_state_flags & SAS_TASK_STATE_DONE) { |
| 328 | spin_unlock_irqrestore(&task->task_state_lock, flags); |
| 329 | SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__, |
| 330 | task); |
| 331 | return TASK_IS_DONE; |
| 332 | } |
| 333 | spin_unlock_irqrestore(&task->task_state_lock, flags); |
| 334 | |
| 335 | if (res == TMF_RESP_FUNC_COMPLETE) { |
| 336 | SAS_DPRINTK("%s: task 0x%p is aborted\n", |
| 337 | __FUNCTION__, task); |
| 338 | return TASK_IS_ABORTED; |
| 339 | } else if (si->dft->lldd_query_task) { |
| 340 | SAS_DPRINTK("%s: querying task 0x%p\n", |
| 341 | __FUNCTION__, task); |
| 342 | res = si->dft->lldd_query_task(task); |
| 343 | if (res == TMF_RESP_FUNC_SUCC) { |
| 344 | SAS_DPRINTK("%s: task 0x%p at LU\n", |
| 345 | __FUNCTION__, task); |
| 346 | return TASK_IS_AT_LU; |
| 347 | } else if (res == TMF_RESP_FUNC_COMPLETE) { |
| 348 | SAS_DPRINTK("%s: task 0x%p not at LU\n", |
| 349 | __FUNCTION__, task); |
| 350 | return TASK_IS_NOT_AT_LU; |
| 351 | } |
| 352 | } |
| 353 | } |
| 354 | return res; |
| 355 | } |
| 356 | |
| 357 | static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd) |
| 358 | { |
| 359 | int res = TMF_RESP_FUNC_FAILED; |
| 360 | struct scsi_lun lun; |
| 361 | struct sas_internal *i = |
| 362 | to_sas_internal(dev->port->ha->core.shost->transportt); |
| 363 | |
| 364 | int_to_scsilun(cmd->device->lun, &lun); |
| 365 | |
| 366 | SAS_DPRINTK("eh: device %llx LUN %x has the task\n", |
| 367 | SAS_ADDR(dev->sas_addr), |
| 368 | cmd->device->lun); |
| 369 | |
| 370 | if (i->dft->lldd_abort_task_set) |
| 371 | res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun); |
| 372 | |
| 373 | if (res == TMF_RESP_FUNC_FAILED) { |
| 374 | if (i->dft->lldd_clear_task_set) |
| 375 | res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun); |
| 376 | } |
| 377 | |
| 378 | if (res == TMF_RESP_FUNC_FAILED) { |
| 379 | if (i->dft->lldd_lu_reset) |
| 380 | res = i->dft->lldd_lu_reset(dev, lun.scsi_lun); |
| 381 | } |
| 382 | |
| 383 | return res; |
| 384 | } |
| 385 | |
| 386 | static int sas_recover_I_T(struct domain_device *dev) |
| 387 | { |
| 388 | int res = TMF_RESP_FUNC_FAILED; |
| 389 | struct sas_internal *i = |
| 390 | to_sas_internal(dev->port->ha->core.shost->transportt); |
| 391 | |
| 392 | SAS_DPRINTK("I_T nexus reset for dev %016llx\n", |
| 393 | SAS_ADDR(dev->sas_addr)); |
| 394 | |
| 395 | if (i->dft->lldd_I_T_nexus_reset) |
| 396 | res = i->dft->lldd_I_T_nexus_reset(dev); |
| 397 | |
| 398 | return res; |
| 399 | } |
| 400 | |
| 401 | void sas_scsi_recover_host(struct Scsi_Host *shost) |
| 402 | { |
| 403 | struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); |
| 404 | unsigned long flags; |
| 405 | LIST_HEAD(error_q); |
| 406 | struct scsi_cmnd *cmd, *n; |
| 407 | enum task_disposition res = TASK_IS_DONE; |
| 408 | int tmf_resp; |
| 409 | struct sas_internal *i = to_sas_internal(shost->transportt); |
| 410 | |
| 411 | spin_lock_irqsave(shost->host_lock, flags); |
| 412 | list_splice_init(&shost->eh_cmd_q, &error_q); |
| 413 | spin_unlock_irqrestore(shost->host_lock, flags); |
| 414 | |
| 415 | SAS_DPRINTK("Enter %s\n", __FUNCTION__); |
| 416 | |
| 417 | /* All tasks on this list were marked SAS_TASK_STATE_ABORTED |
| 418 | * by sas_scsi_timed_out() callback. |
| 419 | */ |
| 420 | Again: |
| 421 | SAS_DPRINTK("going over list...\n"); |
| 422 | list_for_each_entry_safe(cmd, n, &error_q, eh_entry) { |
| 423 | struct sas_task *task = TO_SAS_TASK(cmd); |
James Bottomley | 2908d77 | 2006-08-29 09:22:51 -0500 | [diff] [blame] | 424 | list_del_init(&cmd->eh_entry); |
Darrick J. Wong | f456393 | 2006-10-30 15:18:39 -0800 | [diff] [blame] | 425 | |
| 426 | if (!task) { |
| 427 | SAS_DPRINTK("%s: taskless cmd?!\n", __FUNCTION__); |
| 428 | continue; |
| 429 | } |
| 430 | SAS_DPRINTK("trying to find task 0x%p\n", task); |
James Bottomley | 2908d77 | 2006-08-29 09:22:51 -0500 | [diff] [blame] | 431 | res = sas_scsi_find_task(task); |
| 432 | |
| 433 | cmd->eh_eflags = 0; |
James Bottomley | 2908d77 | 2006-08-29 09:22:51 -0500 | [diff] [blame] | 434 | |
| 435 | switch (res) { |
| 436 | case TASK_IS_DONE: |
| 437 | SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__, |
| 438 | task); |
| 439 | task->task_done(task); |
| 440 | continue; |
| 441 | case TASK_IS_ABORTED: |
| 442 | SAS_DPRINTK("%s: task 0x%p is aborted\n", |
| 443 | __FUNCTION__, task); |
| 444 | task->task_done(task); |
| 445 | continue; |
| 446 | case TASK_IS_AT_LU: |
| 447 | SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task); |
| 448 | tmf_resp = sas_recover_lu(task->dev, cmd); |
| 449 | if (tmf_resp == TMF_RESP_FUNC_COMPLETE) { |
| 450 | SAS_DPRINTK("dev %016llx LU %x is " |
| 451 | "recovered\n", |
| 452 | SAS_ADDR(task->dev), |
| 453 | cmd->device->lun); |
| 454 | task->task_done(task); |
| 455 | sas_scsi_clear_queue_lu(&error_q, cmd); |
| 456 | goto Again; |
| 457 | } |
| 458 | /* fallthrough */ |
| 459 | case TASK_IS_NOT_AT_LU: |
| 460 | SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n", |
| 461 | task); |
| 462 | tmf_resp = sas_recover_I_T(task->dev); |
| 463 | if (tmf_resp == TMF_RESP_FUNC_COMPLETE) { |
| 464 | SAS_DPRINTK("I_T %016llx recovered\n", |
| 465 | SAS_ADDR(task->dev->sas_addr)); |
| 466 | task->task_done(task); |
| 467 | sas_scsi_clear_queue_I_T(&error_q, task->dev); |
| 468 | goto Again; |
| 469 | } |
| 470 | /* Hammer time :-) */ |
| 471 | if (i->dft->lldd_clear_nexus_port) { |
| 472 | struct asd_sas_port *port = task->dev->port; |
| 473 | SAS_DPRINTK("clearing nexus for port:%d\n", |
| 474 | port->id); |
| 475 | res = i->dft->lldd_clear_nexus_port(port); |
| 476 | if (res == TMF_RESP_FUNC_COMPLETE) { |
| 477 | SAS_DPRINTK("clear nexus port:%d " |
| 478 | "succeeded\n", port->id); |
| 479 | task->task_done(task); |
| 480 | sas_scsi_clear_queue_port(&error_q, |
| 481 | port); |
| 482 | goto Again; |
| 483 | } |
| 484 | } |
| 485 | if (i->dft->lldd_clear_nexus_ha) { |
| 486 | SAS_DPRINTK("clear nexus ha\n"); |
| 487 | res = i->dft->lldd_clear_nexus_ha(ha); |
| 488 | if (res == TMF_RESP_FUNC_COMPLETE) { |
| 489 | SAS_DPRINTK("clear nexus ha " |
| 490 | "succeeded\n"); |
| 491 | task->task_done(task); |
| 492 | goto out; |
| 493 | } |
| 494 | } |
| 495 | /* If we are here -- this means that no amount |
| 496 | * of effort could recover from errors. Quite |
| 497 | * possibly the HA just disappeared. |
| 498 | */ |
| 499 | SAS_DPRINTK("error from device %llx, LUN %x " |
| 500 | "couldn't be recovered in any way\n", |
| 501 | SAS_ADDR(task->dev->sas_addr), |
| 502 | cmd->device->lun); |
| 503 | |
| 504 | task->task_done(task); |
| 505 | goto clear_q; |
| 506 | } |
| 507 | } |
| 508 | out: |
Darrick J. Wong | f456393 | 2006-10-30 15:18:39 -0800 | [diff] [blame] | 509 | scsi_eh_flush_done_q(&ha->eh_done_q); |
James Bottomley | 2908d77 | 2006-08-29 09:22:51 -0500 | [diff] [blame] | 510 | SAS_DPRINTK("--- Exit %s\n", __FUNCTION__); |
| 511 | return; |
| 512 | clear_q: |
| 513 | SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__); |
| 514 | list_for_each_entry_safe(cmd, n, &error_q, eh_entry) { |
| 515 | struct sas_task *task = TO_SAS_TASK(cmd); |
| 516 | list_del_init(&cmd->eh_entry); |
| 517 | task->task_done(task); |
| 518 | } |
| 519 | } |
| 520 | |
| 521 | enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd) |
| 522 | { |
| 523 | struct sas_task *task = TO_SAS_TASK(cmd); |
| 524 | unsigned long flags; |
| 525 | |
| 526 | if (!task) { |
Darrick J. Wong | f456393 | 2006-10-30 15:18:39 -0800 | [diff] [blame] | 527 | SAS_DPRINTK("command 0x%p, task 0x%p, gone: EH_HANDLED\n", |
James Bottomley | 2908d77 | 2006-08-29 09:22:51 -0500 | [diff] [blame] | 528 | cmd, task); |
| 529 | return EH_HANDLED; |
| 530 | } |
| 531 | |
| 532 | spin_lock_irqsave(&task->task_state_lock, flags); |
Darrick J. Wong | f456393 | 2006-10-30 15:18:39 -0800 | [diff] [blame] | 533 | if (task->task_state_flags & SAS_TASK_INITIATOR_ABORTED) { |
| 534 | spin_unlock_irqrestore(&task->task_state_lock, flags); |
| 535 | SAS_DPRINTK("command 0x%p, task 0x%p, aborted by initiator: " |
| 536 | "EH_NOT_HANDLED\n", cmd, task); |
| 537 | return EH_NOT_HANDLED; |
| 538 | } |
James Bottomley | 2908d77 | 2006-08-29 09:22:51 -0500 | [diff] [blame] | 539 | if (task->task_state_flags & SAS_TASK_STATE_DONE) { |
| 540 | spin_unlock_irqrestore(&task->task_state_lock, flags); |
| 541 | SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n", |
| 542 | cmd, task); |
| 543 | return EH_HANDLED; |
| 544 | } |
| 545 | task->task_state_flags |= SAS_TASK_STATE_ABORTED; |
| 546 | spin_unlock_irqrestore(&task->task_state_lock, flags); |
| 547 | |
| 548 | SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n", |
| 549 | cmd, task); |
| 550 | |
| 551 | return EH_NOT_HANDLED; |
| 552 | } |
| 553 | |
| 554 | struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy) |
| 555 | { |
| 556 | struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent); |
| 557 | struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); |
| 558 | struct domain_device *found_dev = NULL; |
| 559 | int i; |
| 560 | |
| 561 | spin_lock(&ha->phy_port_lock); |
| 562 | for (i = 0; i < ha->num_phys; i++) { |
| 563 | struct asd_sas_port *port = ha->sas_port[i]; |
| 564 | struct domain_device *dev; |
| 565 | |
| 566 | spin_lock(&port->dev_list_lock); |
| 567 | list_for_each_entry(dev, &port->dev_list, dev_list_node) { |
| 568 | if (rphy == dev->rphy) { |
| 569 | found_dev = dev; |
| 570 | spin_unlock(&port->dev_list_lock); |
| 571 | goto found; |
| 572 | } |
| 573 | } |
| 574 | spin_unlock(&port->dev_list_lock); |
| 575 | } |
| 576 | found: |
| 577 | spin_unlock(&ha->phy_port_lock); |
| 578 | |
| 579 | return found_dev; |
| 580 | } |
| 581 | |
| 582 | static inline struct domain_device *sas_find_target(struct scsi_target *starget) |
| 583 | { |
| 584 | struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent); |
| 585 | |
| 586 | return sas_find_dev_by_rphy(rphy); |
| 587 | } |
| 588 | |
| 589 | int sas_target_alloc(struct scsi_target *starget) |
| 590 | { |
| 591 | struct domain_device *found_dev = sas_find_target(starget); |
| 592 | |
| 593 | if (!found_dev) |
| 594 | return -ENODEV; |
| 595 | |
| 596 | starget->hostdata = found_dev; |
| 597 | return 0; |
| 598 | } |
| 599 | |
| 600 | #define SAS_DEF_QD 32 |
| 601 | #define SAS_MAX_QD 64 |
| 602 | |
| 603 | int sas_slave_configure(struct scsi_device *scsi_dev) |
| 604 | { |
| 605 | struct domain_device *dev = sdev_to_domain_dev(scsi_dev); |
| 606 | struct sas_ha_struct *sas_ha; |
| 607 | |
| 608 | BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE); |
| 609 | |
| 610 | sas_ha = dev->port->ha; |
| 611 | |
| 612 | sas_read_port_mode_page(scsi_dev); |
| 613 | |
| 614 | if (scsi_dev->tagged_supported) { |
| 615 | scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG); |
| 616 | scsi_activate_tcq(scsi_dev, SAS_DEF_QD); |
| 617 | } else { |
| 618 | SAS_DPRINTK("device %llx, LUN %x doesn't support " |
| 619 | "TCQ\n", SAS_ADDR(dev->sas_addr), |
| 620 | scsi_dev->lun); |
| 621 | scsi_dev->tagged_supported = 0; |
| 622 | scsi_set_tag_type(scsi_dev, 0); |
| 623 | scsi_deactivate_tcq(scsi_dev, 1); |
| 624 | } |
| 625 | |
| 626 | return 0; |
| 627 | } |
| 628 | |
| 629 | void sas_slave_destroy(struct scsi_device *scsi_dev) |
| 630 | { |
| 631 | } |
| 632 | |
| 633 | int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth) |
| 634 | { |
| 635 | int res = min(new_depth, SAS_MAX_QD); |
| 636 | |
| 637 | if (scsi_dev->tagged_supported) |
| 638 | scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev), |
| 639 | res); |
| 640 | else { |
| 641 | struct domain_device *dev = sdev_to_domain_dev(scsi_dev); |
| 642 | sas_printk("device %llx LUN %x queue depth changed to 1\n", |
| 643 | SAS_ADDR(dev->sas_addr), |
| 644 | scsi_dev->lun); |
| 645 | scsi_adjust_queue_depth(scsi_dev, 0, 1); |
| 646 | res = 1; |
| 647 | } |
| 648 | |
| 649 | return res; |
| 650 | } |
| 651 | |
| 652 | int sas_change_queue_type(struct scsi_device *scsi_dev, int qt) |
| 653 | { |
| 654 | if (!scsi_dev->tagged_supported) |
| 655 | return 0; |
| 656 | |
| 657 | scsi_deactivate_tcq(scsi_dev, 1); |
| 658 | |
| 659 | scsi_set_tag_type(scsi_dev, qt); |
| 660 | scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth); |
| 661 | |
| 662 | return qt; |
| 663 | } |
| 664 | |
| 665 | int sas_bios_param(struct scsi_device *scsi_dev, |
| 666 | struct block_device *bdev, |
| 667 | sector_t capacity, int *hsc) |
| 668 | { |
| 669 | hsc[0] = 255; |
| 670 | hsc[1] = 63; |
| 671 | sector_div(capacity, 255*63); |
| 672 | hsc[2] = capacity; |
| 673 | |
| 674 | return 0; |
| 675 | } |
| 676 | |
| 677 | /* ---------- Task Collector Thread implementation ---------- */ |
| 678 | |
| 679 | static void sas_queue(struct sas_ha_struct *sas_ha) |
| 680 | { |
| 681 | struct scsi_core *core = &sas_ha->core; |
| 682 | unsigned long flags; |
| 683 | LIST_HEAD(q); |
| 684 | int can_queue; |
| 685 | int res; |
| 686 | struct sas_internal *i = to_sas_internal(core->shost->transportt); |
| 687 | |
| 688 | spin_lock_irqsave(&core->task_queue_lock, flags); |
| 689 | while (!core->queue_thread_kill && |
| 690 | !list_empty(&core->task_queue)) { |
| 691 | |
| 692 | can_queue = sas_ha->lldd_queue_size - core->task_queue_size; |
| 693 | if (can_queue >= 0) { |
| 694 | can_queue = core->task_queue_size; |
| 695 | list_splice_init(&core->task_queue, &q); |
| 696 | } else { |
| 697 | struct list_head *a, *n; |
| 698 | |
| 699 | can_queue = sas_ha->lldd_queue_size; |
| 700 | list_for_each_safe(a, n, &core->task_queue) { |
| 701 | list_move_tail(a, &q); |
| 702 | if (--can_queue == 0) |
| 703 | break; |
| 704 | } |
| 705 | can_queue = sas_ha->lldd_queue_size; |
| 706 | } |
| 707 | core->task_queue_size -= can_queue; |
| 708 | spin_unlock_irqrestore(&core->task_queue_lock, flags); |
| 709 | { |
| 710 | struct sas_task *task = list_entry(q.next, |
| 711 | struct sas_task, |
| 712 | list); |
| 713 | list_del_init(&q); |
| 714 | res = i->dft->lldd_execute_task(task, can_queue, |
| 715 | GFP_KERNEL); |
| 716 | if (unlikely(res)) |
| 717 | __list_add(&q, task->list.prev, &task->list); |
| 718 | } |
| 719 | spin_lock_irqsave(&core->task_queue_lock, flags); |
| 720 | if (res) { |
| 721 | list_splice_init(&q, &core->task_queue); /*at head*/ |
| 722 | core->task_queue_size += can_queue; |
| 723 | } |
| 724 | } |
| 725 | spin_unlock_irqrestore(&core->task_queue_lock, flags); |
| 726 | } |
| 727 | |
| 728 | static DECLARE_COMPLETION(queue_th_comp); |
| 729 | |
| 730 | /** |
| 731 | * sas_queue_thread -- The Task Collector thread |
| 732 | * @_sas_ha: pointer to struct sas_ha |
| 733 | */ |
| 734 | static int sas_queue_thread(void *_sas_ha) |
| 735 | { |
| 736 | struct sas_ha_struct *sas_ha = _sas_ha; |
| 737 | struct scsi_core *core = &sas_ha->core; |
| 738 | |
| 739 | daemonize("sas_queue_%d", core->shost->host_no); |
| 740 | current->flags |= PF_NOFREEZE; |
| 741 | |
| 742 | complete(&queue_th_comp); |
| 743 | |
| 744 | while (1) { |
| 745 | down_interruptible(&core->queue_thread_sema); |
| 746 | sas_queue(sas_ha); |
| 747 | if (core->queue_thread_kill) |
| 748 | break; |
| 749 | } |
| 750 | |
| 751 | complete(&queue_th_comp); |
| 752 | |
| 753 | return 0; |
| 754 | } |
| 755 | |
| 756 | int sas_init_queue(struct sas_ha_struct *sas_ha) |
| 757 | { |
| 758 | int res; |
| 759 | struct scsi_core *core = &sas_ha->core; |
| 760 | |
| 761 | spin_lock_init(&core->task_queue_lock); |
| 762 | core->task_queue_size = 0; |
| 763 | INIT_LIST_HEAD(&core->task_queue); |
| 764 | init_MUTEX_LOCKED(&core->queue_thread_sema); |
| 765 | |
| 766 | res = kernel_thread(sas_queue_thread, sas_ha, 0); |
| 767 | if (res >= 0) |
| 768 | wait_for_completion(&queue_th_comp); |
| 769 | |
| 770 | return res < 0 ? res : 0; |
| 771 | } |
| 772 | |
| 773 | void sas_shutdown_queue(struct sas_ha_struct *sas_ha) |
| 774 | { |
| 775 | unsigned long flags; |
| 776 | struct scsi_core *core = &sas_ha->core; |
| 777 | struct sas_task *task, *n; |
| 778 | |
| 779 | init_completion(&queue_th_comp); |
| 780 | core->queue_thread_kill = 1; |
| 781 | up(&core->queue_thread_sema); |
| 782 | wait_for_completion(&queue_th_comp); |
| 783 | |
| 784 | if (!list_empty(&core->task_queue)) |
| 785 | SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n", |
| 786 | SAS_ADDR(sas_ha->sas_addr)); |
| 787 | |
| 788 | spin_lock_irqsave(&core->task_queue_lock, flags); |
| 789 | list_for_each_entry_safe(task, n, &core->task_queue, list) { |
| 790 | struct scsi_cmnd *cmd = task->uldd_task; |
| 791 | |
| 792 | list_del_init(&task->list); |
| 793 | |
| 794 | ASSIGN_SAS_TASK(cmd, NULL); |
| 795 | sas_free_task(task); |
| 796 | cmd->result = DID_ABORT << 16; |
| 797 | cmd->scsi_done(cmd); |
| 798 | } |
| 799 | spin_unlock_irqrestore(&core->task_queue_lock, flags); |
| 800 | } |
| 801 | |
Darrick J. Wong | 79a5eb6 | 2006-10-30 15:18:50 -0800 | [diff] [blame] | 802 | static int do_sas_task_abort(struct sas_task *task) |
| 803 | { |
| 804 | struct scsi_cmnd *sc = task->uldd_task; |
| 805 | struct sas_internal *si = |
| 806 | to_sas_internal(task->dev->port->ha->core.shost->transportt); |
| 807 | unsigned long flags; |
| 808 | int res; |
| 809 | |
| 810 | spin_lock_irqsave(&task->task_state_lock, flags); |
| 811 | if (task->task_state_flags & SAS_TASK_STATE_ABORTED) { |
| 812 | spin_unlock_irqrestore(&task->task_state_lock, flags); |
| 813 | SAS_DPRINTK("%s: Task %p already aborted.\n", __FUNCTION__, |
| 814 | task); |
| 815 | return 0; |
| 816 | } |
| 817 | |
| 818 | task->task_state_flags |= SAS_TASK_INITIATOR_ABORTED; |
| 819 | if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) |
| 820 | task->task_state_flags |= SAS_TASK_STATE_ABORTED; |
| 821 | spin_unlock_irqrestore(&task->task_state_lock, flags); |
| 822 | |
| 823 | if (!si->dft->lldd_abort_task) |
| 824 | return -ENODEV; |
| 825 | |
| 826 | res = si->dft->lldd_abort_task(task); |
| 827 | if ((task->task_state_flags & SAS_TASK_STATE_DONE) || |
| 828 | (res == TMF_RESP_FUNC_COMPLETE)) |
| 829 | { |
| 830 | /* SMP commands don't have scsi_cmds(?) */ |
| 831 | if (!sc) { |
| 832 | task->task_done(task); |
| 833 | return 0; |
| 834 | } |
| 835 | scsi_req_abort_cmd(sc); |
| 836 | scsi_schedule_eh(sc->device->host); |
| 837 | return 0; |
| 838 | } |
| 839 | |
| 840 | spin_lock_irqsave(&task->task_state_lock, flags); |
| 841 | task->task_state_flags &= ~SAS_TASK_INITIATOR_ABORTED; |
| 842 | if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) |
| 843 | task->task_state_flags &= ~SAS_TASK_STATE_ABORTED; |
| 844 | spin_unlock_irqrestore(&task->task_state_lock, flags); |
| 845 | |
| 846 | return -EAGAIN; |
| 847 | } |
| 848 | |
| 849 | void sas_task_abort(struct sas_task *task) |
| 850 | { |
| 851 | int i; |
| 852 | |
| 853 | for (i = 0; i < 5; i++) |
| 854 | if (!do_sas_task_abort(task)) |
| 855 | return; |
| 856 | |
| 857 | SAS_DPRINTK("%s: Could not kill task!\n", __FUNCTION__); |
| 858 | } |
| 859 | |
James Bottomley | 2908d77 | 2006-08-29 09:22:51 -0500 | [diff] [blame] | 860 | EXPORT_SYMBOL_GPL(sas_queuecommand); |
| 861 | EXPORT_SYMBOL_GPL(sas_target_alloc); |
| 862 | EXPORT_SYMBOL_GPL(sas_slave_configure); |
| 863 | EXPORT_SYMBOL_GPL(sas_slave_destroy); |
| 864 | EXPORT_SYMBOL_GPL(sas_change_queue_depth); |
| 865 | EXPORT_SYMBOL_GPL(sas_change_queue_type); |
| 866 | EXPORT_SYMBOL_GPL(sas_bios_param); |
Darrick J. Wong | 79a5eb6 | 2006-10-30 15:18:50 -0800 | [diff] [blame] | 867 | EXPORT_SYMBOL_GPL(sas_task_abort); |
Darrick J. Wong | dea2221 | 2006-11-07 17:28:55 -0800 | [diff] [blame^] | 868 | EXPORT_SYMBOL_GPL(sas_phy_reset); |