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_CHECK_COND: 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_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 task = sas_alloc_task(GFP_ATOMIC); 166 if (!task) 167 return AC_ERR_SYSTEM; 168 task->dev = dev; 169 task->task_proto = SAS_PROTOCOL_STP; 170 task->task_done = sas_ata_task_done; 171 172 if (qc->tf.command == ATA_CMD_FPDMA_WRITE || 173 qc->tf.command == ATA_CMD_FPDMA_READ) { 174 /* Need to zero out the tag libata assigned us */ 175 qc->tf.nsect = 0; 176 } 177 178 ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis); 179 task->uldd_task = qc; 180 if (ata_is_atapi(qc->tf.protocol)) { 181 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len); 182 task->total_xfer_len = qc->nbytes; 183 task->num_scatter = qc->n_elem; 184 } else { 185 for_each_sg(qc->sg, sg, qc->n_elem, si) 186 xfer += sg->length; 187 188 task->total_xfer_len = xfer; 189 task->num_scatter = si; 190 } 191 192 task->data_dir = qc->dma_dir; 193 task->scatter = qc->sg; 194 task->ata_task.retry_count = 1; 195 task->task_state_flags = SAS_TASK_STATE_PENDING; 196 qc->lldd_task = task; 197 198 switch (qc->tf.protocol) { 199 case ATA_PROT_NCQ: 200 task->ata_task.use_ncq = 1; 201 /* fall through */ 202 case ATAPI_PROT_DMA: 203 case ATA_PROT_DMA: 204 task->ata_task.dma_xfer = 1; 205 break; 206 } 207 208 if (qc->scsicmd) 209 ASSIGN_SAS_TASK(qc->scsicmd, task); 210 211 if (sas_ha->lldd_max_execute_num < 2) 212 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC); 213 else 214 res = sas_queue_up(task); 215 216 /* Examine */ 217 if (res) { 218 SAS_DPRINTK("lldd_execute_task returned: %d\n", res); 219 220 if (qc->scsicmd) 221 ASSIGN_SAS_TASK(qc->scsicmd, NULL); 222 sas_free_task(task); 223 return AC_ERR_SYSTEM; 224 } 225 226 return 0; 227 } 228 229 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc) 230 { 231 struct domain_device *dev = qc->ap->private_data; 232 233 memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf)); 234 return true; 235 } 236 237 static void sas_ata_phy_reset(struct ata_port *ap) 238 { 239 struct domain_device *dev = ap->private_data; 240 struct sas_internal *i = 241 to_sas_internal(dev->port->ha->core.shost->transportt); 242 int res = TMF_RESP_FUNC_FAILED; 243 244 if (i->dft->lldd_I_T_nexus_reset) 245 res = i->dft->lldd_I_T_nexus_reset(dev); 246 247 if (res != TMF_RESP_FUNC_COMPLETE) 248 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__); 249 250 switch (dev->sata_dev.command_set) { 251 case ATA_COMMAND_SET: 252 SAS_DPRINTK("%s: Found ATA device.\n", __func__); 253 ap->link.device[0].class = ATA_DEV_ATA; 254 break; 255 case ATAPI_COMMAND_SET: 256 SAS_DPRINTK("%s: Found ATAPI device.\n", __func__); 257 ap->link.device[0].class = ATA_DEV_ATAPI; 258 break; 259 default: 260 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n", 261 __func__, 262 dev->sata_dev.command_set); 263 ap->link.device[0].class = ATA_DEV_UNKNOWN; 264 break; 265 } 266 267 ap->cbl = ATA_CBL_SATA; 268 } 269 270 static void sas_ata_post_internal(struct ata_queued_cmd *qc) 271 { 272 if (qc->flags & ATA_QCFLAG_FAILED) 273 qc->err_mask |= AC_ERR_OTHER; 274 275 if (qc->err_mask) { 276 /* 277 * Find the sas_task and kill it. By this point, 278 * libata has decided to kill the qc, so we needn't 279 * bother with sas_ata_task_done. But we still 280 * ought to abort the task. 281 */ 282 struct sas_task *task = qc->lldd_task; 283 unsigned long flags; 284 285 qc->lldd_task = NULL; 286 if (task) { 287 /* Should this be a AT(API) device reset? */ 288 spin_lock_irqsave(&task->task_state_lock, flags); 289 task->task_state_flags |= SAS_TASK_NEED_DEV_RESET; 290 spin_unlock_irqrestore(&task->task_state_lock, flags); 291 292 task->uldd_task = NULL; 293 __sas_task_abort(task); 294 } 295 } 296 } 297 298 static int sas_ata_scr_write(struct ata_link *link, unsigned int sc_reg_in, 299 u32 val) 300 { 301 struct domain_device *dev = link->ap->private_data; 302 303 SAS_DPRINTK("STUB %s\n", __func__); 304 switch (sc_reg_in) { 305 case SCR_STATUS: 306 dev->sata_dev.sstatus = val; 307 break; 308 case SCR_CONTROL: 309 dev->sata_dev.scontrol = val; 310 break; 311 case SCR_ERROR: 312 dev->sata_dev.serror = val; 313 break; 314 case SCR_ACTIVE: 315 dev->sata_dev.ap->link.sactive = val; 316 break; 317 default: 318 return -EINVAL; 319 } 320 return 0; 321 } 322 323 static int sas_ata_scr_read(struct ata_link *link, unsigned int sc_reg_in, 324 u32 *val) 325 { 326 struct domain_device *dev = link->ap->private_data; 327 328 SAS_DPRINTK("STUB %s\n", __func__); 329 switch (sc_reg_in) { 330 case SCR_STATUS: 331 *val = dev->sata_dev.sstatus; 332 return 0; 333 case SCR_CONTROL: 334 *val = dev->sata_dev.scontrol; 335 return 0; 336 case SCR_ERROR: 337 *val = dev->sata_dev.serror; 338 return 0; 339 case SCR_ACTIVE: 340 *val = dev->sata_dev.ap->link.sactive; 341 return 0; 342 default: 343 return -EINVAL; 344 } 345 } 346 347 static struct ata_port_operations sas_sata_ops = { 348 .phy_reset = sas_ata_phy_reset, 349 .post_internal_cmd = sas_ata_post_internal, 350 .qc_prep = ata_noop_qc_prep, 351 .qc_issue = sas_ata_qc_issue, 352 .qc_fill_rtf = sas_ata_qc_fill_rtf, 353 .port_start = ata_sas_port_start, 354 .port_stop = ata_sas_port_stop, 355 .scr_read = sas_ata_scr_read, 356 .scr_write = sas_ata_scr_write 357 }; 358 359 static struct ata_port_info sata_port_info = { 360 .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET | 361 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ, 362 .pio_mask = 0x1f, /* PIO0-4 */ 363 .mwdma_mask = 0x07, /* MWDMA0-2 */ 364 .udma_mask = ATA_UDMA6, 365 .port_ops = &sas_sata_ops 366 }; 367 368 int sas_ata_init_host_and_port(struct domain_device *found_dev, 369 struct scsi_target *starget) 370 { 371 struct Scsi_Host *shost = dev_to_shost(&starget->dev); 372 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); 373 struct ata_port *ap; 374 375 ata_host_init(&found_dev->sata_dev.ata_host, 376 ha->dev, 377 sata_port_info.flags, 378 &sas_sata_ops); 379 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host, 380 &sata_port_info, 381 shost); 382 if (!ap) { 383 SAS_DPRINTK("ata_sas_port_alloc failed.\n"); 384 return -ENODEV; 385 } 386 387 ap->private_data = found_dev; 388 ap->cbl = ATA_CBL_SATA; 389 ap->scsi_host = shost; 390 found_dev->sata_dev.ap = ap; 391 392 return 0; 393 } 394 395 void sas_ata_task_abort(struct sas_task *task) 396 { 397 struct ata_queued_cmd *qc = task->uldd_task; 398 struct completion *waiting; 399 400 /* Bounce SCSI-initiated commands to the SCSI EH */ 401 if (qc->scsicmd) { 402 blk_abort_request(qc->scsicmd->request); 403 scsi_schedule_eh(qc->scsicmd->device->host); 404 return; 405 } 406 407 /* Internal command, fake a timeout and complete. */ 408 qc->flags &= ~ATA_QCFLAG_ACTIVE; 409 qc->flags |= ATA_QCFLAG_FAILED; 410 qc->err_mask |= AC_ERR_TIMEOUT; 411 waiting = qc->private_data; 412 complete(waiting); 413 } 414 415 static void sas_task_timedout(unsigned long _task) 416 { 417 struct sas_task *task = (void *) _task; 418 unsigned long flags; 419 420 spin_lock_irqsave(&task->task_state_lock, flags); 421 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) 422 task->task_state_flags |= SAS_TASK_STATE_ABORTED; 423 spin_unlock_irqrestore(&task->task_state_lock, flags); 424 425 complete(&task->completion); 426 } 427 428 static void sas_disc_task_done(struct sas_task *task) 429 { 430 if (!del_timer(&task->timer)) 431 return; 432 complete(&task->completion); 433 } 434 435 #define SAS_DEV_TIMEOUT 10 436 437 /** 438 * sas_execute_task -- Basic task processing for discovery 439 * @task: the task to be executed 440 * @buffer: pointer to buffer to do I/O 441 * @size: size of @buffer 442 * @dma_dir: DMA direction. DMA_xxx 443 */ 444 static int sas_execute_task(struct sas_task *task, void *buffer, int size, 445 enum dma_data_direction dma_dir) 446 { 447 int res = 0; 448 struct scatterlist *scatter = NULL; 449 struct task_status_struct *ts = &task->task_status; 450 int num_scatter = 0; 451 int retries = 0; 452 struct sas_internal *i = 453 to_sas_internal(task->dev->port->ha->core.shost->transportt); 454 455 if (dma_dir != DMA_NONE) { 456 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL); 457 if (!scatter) 458 goto out; 459 460 sg_init_one(scatter, buffer, size); 461 num_scatter = 1; 462 } 463 464 task->task_proto = task->dev->tproto; 465 task->scatter = scatter; 466 task->num_scatter = num_scatter; 467 task->total_xfer_len = size; 468 task->data_dir = dma_dir; 469 task->task_done = sas_disc_task_done; 470 if (dma_dir != DMA_NONE && 471 sas_protocol_ata(task->task_proto)) { 472 task->num_scatter = dma_map_sg(task->dev->port->ha->dev, 473 task->scatter, 474 task->num_scatter, 475 task->data_dir); 476 } 477 478 for (retries = 0; retries < 5; retries++) { 479 task->task_state_flags = SAS_TASK_STATE_PENDING; 480 init_completion(&task->completion); 481 482 task->timer.data = (unsigned long) task; 483 task->timer.function = sas_task_timedout; 484 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ; 485 add_timer(&task->timer); 486 487 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL); 488 if (res) { 489 del_timer(&task->timer); 490 SAS_DPRINTK("executing SAS discovery task failed:%d\n", 491 res); 492 goto ex_err; 493 } 494 wait_for_completion(&task->completion); 495 res = -ECOMM; 496 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) { 497 int res2; 498 SAS_DPRINTK("task aborted, flags:0x%x\n", 499 task->task_state_flags); 500 res2 = i->dft->lldd_abort_task(task); 501 SAS_DPRINTK("came back from abort task\n"); 502 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) { 503 if (res2 == TMF_RESP_FUNC_COMPLETE) 504 continue; /* Retry the task */ 505 else 506 goto ex_err; 507 } 508 } 509 if (task->task_status.stat == SAM_BUSY || 510 task->task_status.stat == SAM_TASK_SET_FULL || 511 task->task_status.stat == SAS_QUEUE_FULL) { 512 SAS_DPRINTK("task: q busy, sleeping...\n"); 513 schedule_timeout_interruptible(HZ); 514 } else if (task->task_status.stat == SAM_CHECK_COND) { 515 struct scsi_sense_hdr shdr; 516 517 if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size, 518 &shdr)) { 519 SAS_DPRINTK("couldn't normalize sense\n"); 520 continue; 521 } 522 if ((shdr.sense_key == 6 && shdr.asc == 0x29) || 523 (shdr.sense_key == 2 && shdr.asc == 4 && 524 shdr.ascq == 1)) { 525 SAS_DPRINTK("device %016llx LUN: %016llx " 526 "powering up or not ready yet, " 527 "sleeping...\n", 528 SAS_ADDR(task->dev->sas_addr), 529 SAS_ADDR(task->ssp_task.LUN)); 530 531 schedule_timeout_interruptible(5*HZ); 532 } else if (shdr.sense_key == 1) { 533 res = 0; 534 break; 535 } else if (shdr.sense_key == 5) { 536 break; 537 } else { 538 SAS_DPRINTK("dev %016llx LUN: %016llx " 539 "sense key:0x%x ASC:0x%x ASCQ:0x%x" 540 "\n", 541 SAS_ADDR(task->dev->sas_addr), 542 SAS_ADDR(task->ssp_task.LUN), 543 shdr.sense_key, 544 shdr.asc, shdr.ascq); 545 } 546 } else if (task->task_status.resp != SAS_TASK_COMPLETE || 547 task->task_status.stat != SAM_GOOD) { 548 SAS_DPRINTK("task finished with resp:0x%x, " 549 "stat:0x%x\n", 550 task->task_status.resp, 551 task->task_status.stat); 552 goto ex_err; 553 } else { 554 res = 0; 555 break; 556 } 557 } 558 ex_err: 559 if (dma_dir != DMA_NONE) { 560 if (sas_protocol_ata(task->task_proto)) 561 dma_unmap_sg(task->dev->port->ha->dev, 562 task->scatter, task->num_scatter, 563 task->data_dir); 564 kfree(scatter); 565 } 566 out: 567 return res; 568 } 569 570 /* ---------- SATA ---------- */ 571 572 static void sas_get_ata_command_set(struct domain_device *dev) 573 { 574 struct dev_to_host_fis *fis = 575 (struct dev_to_host_fis *) dev->frame_rcvd; 576 577 if ((fis->sector_count == 1 && /* ATA */ 578 fis->lbal == 1 && 579 fis->lbam == 0 && 580 fis->lbah == 0 && 581 fis->device == 0) 582 || 583 (fis->sector_count == 0 && /* CE-ATA (mATA) */ 584 fis->lbal == 0 && 585 fis->lbam == 0xCE && 586 fis->lbah == 0xAA && 587 (fis->device & ~0x10) == 0)) 588 589 dev->sata_dev.command_set = ATA_COMMAND_SET; 590 591 else if ((fis->interrupt_reason == 1 && /* ATAPI */ 592 fis->lbal == 1 && 593 fis->byte_count_low == 0x14 && 594 fis->byte_count_high == 0xEB && 595 (fis->device & ~0x10) == 0)) 596 597 dev->sata_dev.command_set = ATAPI_COMMAND_SET; 598 599 else if ((fis->sector_count == 1 && /* SEMB */ 600 fis->lbal == 1 && 601 fis->lbam == 0x3C && 602 fis->lbah == 0xC3 && 603 fis->device == 0) 604 || 605 (fis->interrupt_reason == 1 && /* SATA PM */ 606 fis->lbal == 1 && 607 fis->byte_count_low == 0x69 && 608 fis->byte_count_high == 0x96 && 609 (fis->device & ~0x10) == 0)) 610 611 /* Treat it as a superset? */ 612 dev->sata_dev.command_set = ATAPI_COMMAND_SET; 613 } 614 615 /** 616 * sas_issue_ata_cmd -- Basic SATA command processing for discovery 617 * @dev: the device to send the command to 618 * @command: the command register 619 * @features: the features register 620 * @buffer: pointer to buffer to do I/O 621 * @size: size of @buffer 622 * @dma_dir: DMA direction. DMA_xxx 623 */ 624 static int sas_issue_ata_cmd(struct domain_device *dev, u8 command, 625 u8 features, void *buffer, int size, 626 enum dma_data_direction dma_dir) 627 { 628 int res = 0; 629 struct sas_task *task; 630 struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *) 631 &dev->frame_rcvd[0]; 632 633 res = -ENOMEM; 634 task = sas_alloc_task(GFP_KERNEL); 635 if (!task) 636 goto out; 637 638 task->dev = dev; 639 640 task->ata_task.fis.fis_type = 0x27; 641 task->ata_task.fis.command = command; 642 task->ata_task.fis.features = features; 643 task->ata_task.fis.device = d2h_fis->device; 644 task->ata_task.retry_count = 1; 645 646 res = sas_execute_task(task, buffer, size, dma_dir); 647 648 sas_free_task(task); 649 out: 650 return res; 651 } 652 653 #define ATA_IDENTIFY_DEV 0xEC 654 #define ATA_IDENTIFY_PACKET_DEV 0xA1 655 #define ATA_SET_FEATURES 0xEF 656 #define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07 657 658 /** 659 * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV) 660 * @dev: STP/SATA device of interest (ATA/ATAPI) 661 * 662 * The LLDD has already been notified of this device, so that we can 663 * send FISes to it. Here we try to get IDENTIFY DEVICE or IDENTIFY 664 * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its 665 * performance for this device. 666 */ 667 static int sas_discover_sata_dev(struct domain_device *dev) 668 { 669 int res; 670 __le16 *identify_x; 671 u8 command; 672 673 identify_x = kzalloc(512, GFP_KERNEL); 674 if (!identify_x) 675 return -ENOMEM; 676 677 if (dev->sata_dev.command_set == ATA_COMMAND_SET) { 678 dev->sata_dev.identify_device = identify_x; 679 command = ATA_IDENTIFY_DEV; 680 } else { 681 dev->sata_dev.identify_packet_device = identify_x; 682 command = ATA_IDENTIFY_PACKET_DEV; 683 } 684 685 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512, 686 DMA_FROM_DEVICE); 687 if (res) 688 goto out_err; 689 690 /* lives on the media? */ 691 if (le16_to_cpu(identify_x[0]) & 4) { 692 /* incomplete response */ 693 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to " 694 "dev %llx\n", SAS_ADDR(dev->sas_addr)); 695 if (!(identify_x[83] & cpu_to_le16(1<<6))) 696 goto cont1; 697 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES, 698 ATA_FEATURE_PUP_STBY_SPIN_UP, 699 NULL, 0, DMA_NONE); 700 if (res) 701 goto cont1; 702 703 schedule_timeout_interruptible(5*HZ); /* More time? */ 704 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512, 705 DMA_FROM_DEVICE); 706 if (res) 707 goto out_err; 708 } 709 cont1: 710 /* XXX Hint: register this SATA device with SATL. 711 When this returns, dev->sata_dev->lu is alive and 712 present. 713 sas_satl_register_dev(dev); 714 */ 715 716 sas_fill_in_rphy(dev, dev->rphy); 717 718 return 0; 719 out_err: 720 dev->sata_dev.identify_packet_device = NULL; 721 dev->sata_dev.identify_device = NULL; 722 kfree(identify_x); 723 return res; 724 } 725 726 static int sas_discover_sata_pm(struct domain_device *dev) 727 { 728 return -ENODEV; 729 } 730 731 /** 732 * sas_discover_sata -- discover an STP/SATA domain device 733 * @dev: pointer to struct domain_device of interest 734 * 735 * First we notify the LLDD of this device, so we can send frames to 736 * it. Then depending on the type of device we call the appropriate 737 * discover functions. Once device discover is done, we notify the 738 * LLDD so that it can fine-tune its parameters for the device, by 739 * removing it and then adding it. That is, the second time around, 740 * the driver would have certain fields, that it is looking at, set. 741 * Finally we initialize the kobj so that the device can be added to 742 * the system at registration time. Devices directly attached to a HA 743 * port, have no parents. All other devices do, and should have their 744 * "parent" pointer set appropriately before calling this function. 745 */ 746 int sas_discover_sata(struct domain_device *dev) 747 { 748 int res; 749 750 sas_get_ata_command_set(dev); 751 752 res = sas_notify_lldd_dev_found(dev); 753 if (res) 754 return res; 755 756 switch (dev->dev_type) { 757 case SATA_DEV: 758 res = sas_discover_sata_dev(dev); 759 break; 760 case SATA_PM: 761 res = sas_discover_sata_pm(dev); 762 break; 763 default: 764 break; 765 } 766 sas_notify_lldd_dev_gone(dev); 767 if (!res) { 768 sas_notify_lldd_dev_found(dev); 769 res = sas_rphy_add(dev->rphy); 770 } 771 772 return res; 773 } 774