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