1 /* 2 * Support for SATA devices on Serial Attached SCSI (SAS) controllers 3 * 4 * Copyright (C) 2006 IBM Corporation 5 * 6 * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of the 11 * License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 21 * USA 22 */ 23 24 #include <linux/scatterlist.h> 25 #include <linux/slab.h> 26 27 #include <scsi/sas_ata.h> 28 #include "sas_internal.h" 29 #include <scsi/scsi_host.h> 30 #include <scsi/scsi_device.h> 31 #include <scsi/scsi_tcq.h> 32 #include <scsi/scsi.h> 33 #include <scsi/scsi_transport.h> 34 #include <scsi/scsi_transport_sas.h> 35 #include "../scsi_sas_internal.h" 36 #include "../scsi_transport_api.h" 37 #include <scsi/scsi_eh.h> 38 39 static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts) 40 { 41 /* Cheesy attempt to translate SAS errors into ATA. Hah! */ 42 43 /* transport error */ 44 if (ts->resp == SAS_TASK_UNDELIVERED) 45 return AC_ERR_ATA_BUS; 46 47 /* ts->resp == SAS_TASK_COMPLETE */ 48 /* task delivered, what happened afterwards? */ 49 switch (ts->stat) { 50 case SAS_DEV_NO_RESPONSE: 51 return AC_ERR_TIMEOUT; 52 53 case SAS_INTERRUPTED: 54 case SAS_PHY_DOWN: 55 case SAS_NAK_R_ERR: 56 return AC_ERR_ATA_BUS; 57 58 59 case SAS_DATA_UNDERRUN: 60 /* 61 * Some programs that use the taskfile interface 62 * (smartctl in particular) can cause underrun 63 * problems. Ignore these errors, perhaps at our 64 * peril. 65 */ 66 return 0; 67 68 case SAS_DATA_OVERRUN: 69 case SAS_QUEUE_FULL: 70 case SAS_DEVICE_UNKNOWN: 71 case SAS_SG_ERR: 72 return AC_ERR_INVALID; 73 74 case SAM_STAT_CHECK_CONDITION: 75 case SAS_OPEN_TO: 76 case SAS_OPEN_REJECT: 77 SAS_DPRINTK("%s: Saw error %d. What to do?\n", 78 __func__, ts->stat); 79 return AC_ERR_OTHER; 80 81 case SAS_ABORTED_TASK: 82 return AC_ERR_DEV; 83 84 case SAS_PROTO_RESPONSE: 85 /* This means the ending_fis has the error 86 * value; return 0 here to collect it */ 87 return 0; 88 default: 89 return 0; 90 } 91 } 92 93 static void sas_ata_task_done(struct sas_task *task) 94 { 95 struct ata_queued_cmd *qc = task->uldd_task; 96 struct domain_device *dev; 97 struct task_status_struct *stat = &task->task_status; 98 struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf; 99 struct sas_ha_struct *sas_ha; 100 enum ata_completion_errors ac; 101 unsigned long flags; 102 103 if (!qc) 104 goto qc_already_gone; 105 106 dev = qc->ap->private_data; 107 sas_ha = dev->port->ha; 108 109 spin_lock_irqsave(dev->sata_dev.ap->lock, flags); 110 if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD) { 111 ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf); 112 qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command); 113 dev->sata_dev.sstatus = resp->sstatus; 114 dev->sata_dev.serror = resp->serror; 115 dev->sata_dev.scontrol = resp->scontrol; 116 } else if (stat->stat != SAM_STAT_GOOD) { 117 ac = sas_to_ata_err(stat); 118 if (ac) { 119 SAS_DPRINTK("%s: SAS error %x\n", __func__, 120 stat->stat); 121 /* We saw a SAS error. Send a vague error. */ 122 qc->err_mask = ac; 123 dev->sata_dev.tf.feature = 0x04; /* status err */ 124 dev->sata_dev.tf.command = ATA_ERR; 125 } 126 } 127 128 qc->lldd_task = NULL; 129 if (qc->scsicmd) 130 ASSIGN_SAS_TASK(qc->scsicmd, NULL); 131 ata_qc_complete(qc); 132 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags); 133 134 /* 135 * If the sas_task has an ata qc, a scsi_cmnd and the aborted 136 * flag is set, then we must have come in via the libsas EH 137 * functions. When we exit this function, we need to put the 138 * scsi_cmnd on the list of finished errors. The ata_qc_complete 139 * call cleans up the libata side of things but we're protected 140 * from the scsi_cmnd going away because the scsi_cmnd is owned 141 * by the EH, making libata's call to scsi_done a NOP. 142 */ 143 spin_lock_irqsave(&task->task_state_lock, flags); 144 if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED) 145 scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q); 146 spin_unlock_irqrestore(&task->task_state_lock, flags); 147 148 qc_already_gone: 149 list_del_init(&task->list); 150 sas_free_task(task); 151 } 152 153 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc) 154 { 155 int res; 156 struct sas_task *task; 157 struct domain_device *dev = qc->ap->private_data; 158 struct sas_ha_struct *sas_ha = dev->port->ha; 159 struct Scsi_Host *host = sas_ha->core.shost; 160 struct sas_internal *i = to_sas_internal(host->transportt); 161 struct scatterlist *sg; 162 unsigned int xfer = 0; 163 unsigned int si; 164 165 /* If the device fell off, no sense in issuing commands */ 166 if (dev->gone) 167 return AC_ERR_SYSTEM; 168 169 task = sas_alloc_task(GFP_ATOMIC); 170 if (!task) 171 return AC_ERR_SYSTEM; 172 task->dev = dev; 173 task->task_proto = SAS_PROTOCOL_STP; 174 task->task_done = sas_ata_task_done; 175 176 if (qc->tf.command == ATA_CMD_FPDMA_WRITE || 177 qc->tf.command == ATA_CMD_FPDMA_READ) { 178 /* Need to zero out the tag libata assigned us */ 179 qc->tf.nsect = 0; 180 } 181 182 ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis); 183 task->uldd_task = qc; 184 if (ata_is_atapi(qc->tf.protocol)) { 185 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len); 186 task->total_xfer_len = qc->nbytes; 187 task->num_scatter = qc->n_elem; 188 } else { 189 for_each_sg(qc->sg, sg, qc->n_elem, si) 190 xfer += sg->length; 191 192 task->total_xfer_len = xfer; 193 task->num_scatter = si; 194 } 195 196 task->data_dir = qc->dma_dir; 197 task->scatter = qc->sg; 198 task->ata_task.retry_count = 1; 199 task->task_state_flags = SAS_TASK_STATE_PENDING; 200 qc->lldd_task = task; 201 202 switch (qc->tf.protocol) { 203 case ATA_PROT_NCQ: 204 task->ata_task.use_ncq = 1; 205 /* fall through */ 206 case ATAPI_PROT_DMA: 207 case ATA_PROT_DMA: 208 task->ata_task.dma_xfer = 1; 209 break; 210 } 211 212 if (qc->scsicmd) 213 ASSIGN_SAS_TASK(qc->scsicmd, task); 214 215 if (sas_ha->lldd_max_execute_num < 2) 216 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC); 217 else 218 res = sas_queue_up(task); 219 220 /* Examine */ 221 if (res) { 222 SAS_DPRINTK("lldd_execute_task returned: %d\n", res); 223 224 if (qc->scsicmd) 225 ASSIGN_SAS_TASK(qc->scsicmd, NULL); 226 sas_free_task(task); 227 return AC_ERR_SYSTEM; 228 } 229 230 return 0; 231 } 232 233 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc) 234 { 235 struct domain_device *dev = qc->ap->private_data; 236 237 memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf)); 238 return true; 239 } 240 241 static void sas_ata_phy_reset(struct ata_port *ap) 242 { 243 struct domain_device *dev = ap->private_data; 244 struct sas_internal *i = 245 to_sas_internal(dev->port->ha->core.shost->transportt); 246 int res = TMF_RESP_FUNC_FAILED; 247 248 if (i->dft->lldd_I_T_nexus_reset) 249 res = i->dft->lldd_I_T_nexus_reset(dev); 250 251 if (res != TMF_RESP_FUNC_COMPLETE) 252 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__); 253 254 switch (dev->sata_dev.command_set) { 255 case ATA_COMMAND_SET: 256 SAS_DPRINTK("%s: Found ATA device.\n", __func__); 257 ap->link.device[0].class = ATA_DEV_ATA; 258 break; 259 case ATAPI_COMMAND_SET: 260 SAS_DPRINTK("%s: Found ATAPI device.\n", __func__); 261 ap->link.device[0].class = ATA_DEV_ATAPI; 262 break; 263 default: 264 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n", 265 __func__, 266 dev->sata_dev.command_set); 267 ap->link.device[0].class = ATA_DEV_UNKNOWN; 268 break; 269 } 270 271 ap->cbl = ATA_CBL_SATA; 272 } 273 274 static void sas_ata_post_internal(struct ata_queued_cmd *qc) 275 { 276 if (qc->flags & ATA_QCFLAG_FAILED) 277 qc->err_mask |= AC_ERR_OTHER; 278 279 if (qc->err_mask) { 280 /* 281 * Find the sas_task and kill it. By this point, 282 * libata has decided to kill the qc, so we needn't 283 * bother with sas_ata_task_done. But we still 284 * ought to abort the task. 285 */ 286 struct sas_task *task = qc->lldd_task; 287 unsigned long flags; 288 289 qc->lldd_task = NULL; 290 if (task) { 291 /* Should this be a AT(API) device reset? */ 292 spin_lock_irqsave(&task->task_state_lock, flags); 293 task->task_state_flags |= SAS_TASK_NEED_DEV_RESET; 294 spin_unlock_irqrestore(&task->task_state_lock, flags); 295 296 task->uldd_task = NULL; 297 __sas_task_abort(task); 298 } 299 } 300 } 301 302 static int sas_ata_scr_write(struct ata_link *link, unsigned int sc_reg_in, 303 u32 val) 304 { 305 struct domain_device *dev = link->ap->private_data; 306 307 SAS_DPRINTK("STUB %s\n", __func__); 308 switch (sc_reg_in) { 309 case SCR_STATUS: 310 dev->sata_dev.sstatus = val; 311 break; 312 case SCR_CONTROL: 313 dev->sata_dev.scontrol = val; 314 break; 315 case SCR_ERROR: 316 dev->sata_dev.serror = val; 317 break; 318 case SCR_ACTIVE: 319 dev->sata_dev.ap->link.sactive = val; 320 break; 321 default: 322 return -EINVAL; 323 } 324 return 0; 325 } 326 327 static int sas_ata_scr_read(struct ata_link *link, unsigned int sc_reg_in, 328 u32 *val) 329 { 330 struct domain_device *dev = link->ap->private_data; 331 332 SAS_DPRINTK("STUB %s\n", __func__); 333 switch (sc_reg_in) { 334 case SCR_STATUS: 335 *val = dev->sata_dev.sstatus; 336 return 0; 337 case SCR_CONTROL: 338 *val = dev->sata_dev.scontrol; 339 return 0; 340 case SCR_ERROR: 341 *val = dev->sata_dev.serror; 342 return 0; 343 case SCR_ACTIVE: 344 *val = dev->sata_dev.ap->link.sactive; 345 return 0; 346 default: 347 return -EINVAL; 348 } 349 } 350 351 static struct ata_port_operations sas_sata_ops = { 352 .phy_reset = sas_ata_phy_reset, 353 .post_internal_cmd = sas_ata_post_internal, 354 .qc_defer = ata_std_qc_defer, 355 .qc_prep = ata_noop_qc_prep, 356 .qc_issue = sas_ata_qc_issue, 357 .qc_fill_rtf = sas_ata_qc_fill_rtf, 358 .port_start = ata_sas_port_start, 359 .port_stop = ata_sas_port_stop, 360 .scr_read = sas_ata_scr_read, 361 .scr_write = sas_ata_scr_write 362 }; 363 364 static struct ata_port_info sata_port_info = { 365 .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET | 366 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ, 367 .pio_mask = 0x1f, /* PIO0-4 */ 368 .mwdma_mask = 0x07, /* MWDMA0-2 */ 369 .udma_mask = ATA_UDMA6, 370 .port_ops = &sas_sata_ops 371 }; 372 373 int sas_ata_init_host_and_port(struct domain_device *found_dev, 374 struct scsi_target *starget) 375 { 376 struct Scsi_Host *shost = dev_to_shost(&starget->dev); 377 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); 378 struct ata_port *ap; 379 380 ata_host_init(&found_dev->sata_dev.ata_host, 381 ha->dev, 382 sata_port_info.flags, 383 &sas_sata_ops); 384 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host, 385 &sata_port_info, 386 shost); 387 if (!ap) { 388 SAS_DPRINTK("ata_sas_port_alloc failed.\n"); 389 return -ENODEV; 390 } 391 392 ap->private_data = found_dev; 393 ap->cbl = ATA_CBL_SATA; 394 ap->scsi_host = shost; 395 found_dev->sata_dev.ap = ap; 396 397 return 0; 398 } 399 400 void sas_ata_task_abort(struct sas_task *task) 401 { 402 struct ata_queued_cmd *qc = task->uldd_task; 403 struct completion *waiting; 404 405 /* Bounce SCSI-initiated commands to the SCSI EH */ 406 if (qc->scsicmd) { 407 struct request_queue *q = qc->scsicmd->device->request_queue; 408 unsigned long flags; 409 410 spin_lock_irqsave(q->queue_lock, flags); 411 blk_abort_request(qc->scsicmd->request); 412 spin_unlock_irqrestore(q->queue_lock, flags); 413 scsi_schedule_eh(qc->scsicmd->device->host); 414 return; 415 } 416 417 /* Internal command, fake a timeout and complete. */ 418 qc->flags &= ~ATA_QCFLAG_ACTIVE; 419 qc->flags |= ATA_QCFLAG_FAILED; 420 qc->err_mask |= AC_ERR_TIMEOUT; 421 waiting = qc->private_data; 422 complete(waiting); 423 } 424 425 static void sas_task_timedout(unsigned long _task) 426 { 427 struct sas_task *task = (void *) _task; 428 unsigned long flags; 429 430 spin_lock_irqsave(&task->task_state_lock, flags); 431 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) 432 task->task_state_flags |= SAS_TASK_STATE_ABORTED; 433 spin_unlock_irqrestore(&task->task_state_lock, flags); 434 435 complete(&task->completion); 436 } 437 438 static void sas_disc_task_done(struct sas_task *task) 439 { 440 if (!del_timer(&task->timer)) 441 return; 442 complete(&task->completion); 443 } 444 445 #define SAS_DEV_TIMEOUT 10 446 447 /** 448 * sas_execute_task -- Basic task processing for discovery 449 * @task: the task to be executed 450 * @buffer: pointer to buffer to do I/O 451 * @size: size of @buffer 452 * @dma_dir: DMA direction. DMA_xxx 453 */ 454 static int sas_execute_task(struct sas_task *task, void *buffer, int size, 455 enum dma_data_direction dma_dir) 456 { 457 int res = 0; 458 struct scatterlist *scatter = NULL; 459 struct task_status_struct *ts = &task->task_status; 460 int num_scatter = 0; 461 int retries = 0; 462 struct sas_internal *i = 463 to_sas_internal(task->dev->port->ha->core.shost->transportt); 464 465 if (dma_dir != DMA_NONE) { 466 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL); 467 if (!scatter) 468 goto out; 469 470 sg_init_one(scatter, buffer, size); 471 num_scatter = 1; 472 } 473 474 task->task_proto = task->dev->tproto; 475 task->scatter = scatter; 476 task->num_scatter = num_scatter; 477 task->total_xfer_len = size; 478 task->data_dir = dma_dir; 479 task->task_done = sas_disc_task_done; 480 if (dma_dir != DMA_NONE && 481 sas_protocol_ata(task->task_proto)) { 482 task->num_scatter = dma_map_sg(task->dev->port->ha->dev, 483 task->scatter, 484 task->num_scatter, 485 task->data_dir); 486 } 487 488 for (retries = 0; retries < 5; retries++) { 489 task->task_state_flags = SAS_TASK_STATE_PENDING; 490 init_completion(&task->completion); 491 492 task->timer.data = (unsigned long) task; 493 task->timer.function = sas_task_timedout; 494 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ; 495 add_timer(&task->timer); 496 497 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL); 498 if (res) { 499 del_timer(&task->timer); 500 SAS_DPRINTK("executing SAS discovery task failed:%d\n", 501 res); 502 goto ex_err; 503 } 504 wait_for_completion(&task->completion); 505 res = -ECOMM; 506 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) { 507 int res2; 508 SAS_DPRINTK("task aborted, flags:0x%x\n", 509 task->task_state_flags); 510 res2 = i->dft->lldd_abort_task(task); 511 SAS_DPRINTK("came back from abort task\n"); 512 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) { 513 if (res2 == TMF_RESP_FUNC_COMPLETE) 514 continue; /* Retry the task */ 515 else 516 goto ex_err; 517 } 518 } 519 if (task->task_status.stat == SAM_STAT_BUSY || 520 task->task_status.stat == SAM_STAT_TASK_SET_FULL || 521 task->task_status.stat == SAS_QUEUE_FULL) { 522 SAS_DPRINTK("task: q busy, sleeping...\n"); 523 schedule_timeout_interruptible(HZ); 524 } else if (task->task_status.stat == SAM_STAT_CHECK_CONDITION) { 525 struct scsi_sense_hdr shdr; 526 527 if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size, 528 &shdr)) { 529 SAS_DPRINTK("couldn't normalize sense\n"); 530 continue; 531 } 532 if ((shdr.sense_key == 6 && shdr.asc == 0x29) || 533 (shdr.sense_key == 2 && shdr.asc == 4 && 534 shdr.ascq == 1)) { 535 SAS_DPRINTK("device %016llx LUN: %016llx " 536 "powering up or not ready yet, " 537 "sleeping...\n", 538 SAS_ADDR(task->dev->sas_addr), 539 SAS_ADDR(task->ssp_task.LUN)); 540 541 schedule_timeout_interruptible(5*HZ); 542 } else if (shdr.sense_key == 1) { 543 res = 0; 544 break; 545 } else if (shdr.sense_key == 5) { 546 break; 547 } else { 548 SAS_DPRINTK("dev %016llx LUN: %016llx " 549 "sense key:0x%x ASC:0x%x ASCQ:0x%x" 550 "\n", 551 SAS_ADDR(task->dev->sas_addr), 552 SAS_ADDR(task->ssp_task.LUN), 553 shdr.sense_key, 554 shdr.asc, shdr.ascq); 555 } 556 } else if (task->task_status.resp != SAS_TASK_COMPLETE || 557 task->task_status.stat != SAM_STAT_GOOD) { 558 SAS_DPRINTK("task finished with resp:0x%x, " 559 "stat:0x%x\n", 560 task->task_status.resp, 561 task->task_status.stat); 562 goto ex_err; 563 } else { 564 res = 0; 565 break; 566 } 567 } 568 ex_err: 569 if (dma_dir != DMA_NONE) { 570 if (sas_protocol_ata(task->task_proto)) 571 dma_unmap_sg(task->dev->port->ha->dev, 572 task->scatter, task->num_scatter, 573 task->data_dir); 574 kfree(scatter); 575 } 576 out: 577 return res; 578 } 579 580 /* ---------- SATA ---------- */ 581 582 static void sas_get_ata_command_set(struct domain_device *dev) 583 { 584 struct dev_to_host_fis *fis = 585 (struct dev_to_host_fis *) dev->frame_rcvd; 586 587 if ((fis->sector_count == 1 && /* ATA */ 588 fis->lbal == 1 && 589 fis->lbam == 0 && 590 fis->lbah == 0 && 591 fis->device == 0) 592 || 593 (fis->sector_count == 0 && /* CE-ATA (mATA) */ 594 fis->lbal == 0 && 595 fis->lbam == 0xCE && 596 fis->lbah == 0xAA && 597 (fis->device & ~0x10) == 0)) 598 599 dev->sata_dev.command_set = ATA_COMMAND_SET; 600 601 else if ((fis->interrupt_reason == 1 && /* ATAPI */ 602 fis->lbal == 1 && 603 fis->byte_count_low == 0x14 && 604 fis->byte_count_high == 0xEB && 605 (fis->device & ~0x10) == 0)) 606 607 dev->sata_dev.command_set = ATAPI_COMMAND_SET; 608 609 else if ((fis->sector_count == 1 && /* SEMB */ 610 fis->lbal == 1 && 611 fis->lbam == 0x3C && 612 fis->lbah == 0xC3 && 613 fis->device == 0) 614 || 615 (fis->interrupt_reason == 1 && /* SATA PM */ 616 fis->lbal == 1 && 617 fis->byte_count_low == 0x69 && 618 fis->byte_count_high == 0x96 && 619 (fis->device & ~0x10) == 0)) 620 621 /* Treat it as a superset? */ 622 dev->sata_dev.command_set = ATAPI_COMMAND_SET; 623 } 624 625 /** 626 * sas_issue_ata_cmd -- Basic SATA command processing for discovery 627 * @dev: the device to send the command to 628 * @command: the command register 629 * @features: the features register 630 * @buffer: pointer to buffer to do I/O 631 * @size: size of @buffer 632 * @dma_dir: DMA direction. DMA_xxx 633 */ 634 static int sas_issue_ata_cmd(struct domain_device *dev, u8 command, 635 u8 features, void *buffer, int size, 636 enum dma_data_direction dma_dir) 637 { 638 int res = 0; 639 struct sas_task *task; 640 struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *) 641 &dev->frame_rcvd[0]; 642 643 res = -ENOMEM; 644 task = sas_alloc_task(GFP_KERNEL); 645 if (!task) 646 goto out; 647 648 task->dev = dev; 649 650 task->ata_task.fis.fis_type = 0x27; 651 task->ata_task.fis.command = command; 652 task->ata_task.fis.features = features; 653 task->ata_task.fis.device = d2h_fis->device; 654 task->ata_task.retry_count = 1; 655 656 res = sas_execute_task(task, buffer, size, dma_dir); 657 658 sas_free_task(task); 659 out: 660 return res; 661 } 662 663 #define ATA_IDENTIFY_DEV 0xEC 664 #define ATA_IDENTIFY_PACKET_DEV 0xA1 665 #define ATA_SET_FEATURES 0xEF 666 #define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07 667 668 /** 669 * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV) 670 * @dev: STP/SATA device of interest (ATA/ATAPI) 671 * 672 * The LLDD has already been notified of this device, so that we can 673 * send FISes to it. Here we try to get IDENTIFY DEVICE or IDENTIFY 674 * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its 675 * performance for this device. 676 */ 677 static int sas_discover_sata_dev(struct domain_device *dev) 678 { 679 int res; 680 __le16 *identify_x; 681 u8 command; 682 683 identify_x = kzalloc(512, GFP_KERNEL); 684 if (!identify_x) 685 return -ENOMEM; 686 687 if (dev->sata_dev.command_set == ATA_COMMAND_SET) { 688 dev->sata_dev.identify_device = identify_x; 689 command = ATA_IDENTIFY_DEV; 690 } else { 691 dev->sata_dev.identify_packet_device = identify_x; 692 command = ATA_IDENTIFY_PACKET_DEV; 693 } 694 695 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512, 696 DMA_FROM_DEVICE); 697 if (res) 698 goto out_err; 699 700 /* lives on the media? */ 701 if (le16_to_cpu(identify_x[0]) & 4) { 702 /* incomplete response */ 703 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to " 704 "dev %llx\n", SAS_ADDR(dev->sas_addr)); 705 if (!(identify_x[83] & cpu_to_le16(1<<6))) 706 goto cont1; 707 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES, 708 ATA_FEATURE_PUP_STBY_SPIN_UP, 709 NULL, 0, DMA_NONE); 710 if (res) 711 goto cont1; 712 713 schedule_timeout_interruptible(5*HZ); /* More time? */ 714 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512, 715 DMA_FROM_DEVICE); 716 if (res) 717 goto out_err; 718 } 719 cont1: 720 /* XXX Hint: register this SATA device with SATL. 721 When this returns, dev->sata_dev->lu is alive and 722 present. 723 sas_satl_register_dev(dev); 724 */ 725 726 sas_fill_in_rphy(dev, dev->rphy); 727 728 return 0; 729 out_err: 730 dev->sata_dev.identify_packet_device = NULL; 731 dev->sata_dev.identify_device = NULL; 732 kfree(identify_x); 733 return res; 734 } 735 736 static int sas_discover_sata_pm(struct domain_device *dev) 737 { 738 return -ENODEV; 739 } 740 741 /** 742 * sas_discover_sata -- discover an STP/SATA domain device 743 * @dev: pointer to struct domain_device of interest 744 * 745 * First we notify the LLDD of this device, so we can send frames to 746 * it. Then depending on the type of device we call the appropriate 747 * discover functions. Once device discover is done, we notify the 748 * LLDD so that it can fine-tune its parameters for the device, by 749 * removing it and then adding it. That is, the second time around, 750 * the driver would have certain fields, that it is looking at, set. 751 * Finally we initialize the kobj so that the device can be added to 752 * the system at registration time. Devices directly attached to a HA 753 * port, have no parents. All other devices do, and should have their 754 * "parent" pointer set appropriately before calling this function. 755 */ 756 int sas_discover_sata(struct domain_device *dev) 757 { 758 int res; 759 760 sas_get_ata_command_set(dev); 761 762 res = sas_notify_lldd_dev_found(dev); 763 if (res) 764 return res; 765 766 switch (dev->dev_type) { 767 case SATA_DEV: 768 res = sas_discover_sata_dev(dev); 769 break; 770 case SATA_PM: 771 res = sas_discover_sata_pm(dev); 772 break; 773 default: 774 break; 775 } 776 sas_notify_lldd_dev_gone(dev); 777 if (!res) { 778 sas_notify_lldd_dev_found(dev); 779 res = sas_rphy_add(dev->rphy); 780 } 781 782 return res; 783 } 784