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 39static 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 93static 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 148qc_already_gone: 149 list_del_init(&task->list); 150 sas_free_task(task); 151} 152 153static 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 229static 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 237static 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 270static 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 298static 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 323static 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 347static struct ata_port_operations sas_sata_ops = { 348 .phy_reset = sas_ata_phy_reset, 349 .post_internal_cmd = sas_ata_post_internal, 350 .qc_defer = ata_std_qc_defer, 351 .qc_prep = ata_noop_qc_prep, 352 .qc_issue = sas_ata_qc_issue, 353 .qc_fill_rtf = sas_ata_qc_fill_rtf, 354 .port_start = ata_sas_port_start, 355 .port_stop = ata_sas_port_stop, 356 .scr_read = sas_ata_scr_read, 357 .scr_write = sas_ata_scr_write 358}; 359 360static struct ata_port_info sata_port_info = { 361 .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET | 362 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ, 363 .pio_mask = 0x1f, /* PIO0-4 */ 364 .mwdma_mask = 0x07, /* MWDMA0-2 */ 365 .udma_mask = ATA_UDMA6, 366 .port_ops = &sas_sata_ops 367}; 368 369int sas_ata_init_host_and_port(struct domain_device *found_dev, 370 struct scsi_target *starget) 371{ 372 struct Scsi_Host *shost = dev_to_shost(&starget->dev); 373 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); 374 struct ata_port *ap; 375 376 ata_host_init(&found_dev->sata_dev.ata_host, 377 ha->dev, 378 sata_port_info.flags, 379 &sas_sata_ops); 380 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host, 381 &sata_port_info, 382 shost); 383 if (!ap) { 384 SAS_DPRINTK("ata_sas_port_alloc failed.\n"); 385 return -ENODEV; 386 } 387 388 ap->private_data = found_dev; 389 ap->cbl = ATA_CBL_SATA; 390 ap->scsi_host = shost; 391 found_dev->sata_dev.ap = ap; 392 393 return 0; 394} 395 396void sas_ata_task_abort(struct sas_task *task) 397{ 398 struct ata_queued_cmd *qc = task->uldd_task; 399 struct completion *waiting; 400 401 /* Bounce SCSI-initiated commands to the SCSI EH */ 402 if (qc->scsicmd) { 403 struct request_queue *q = qc->scsicmd->device->request_queue; 404 unsigned long flags; 405 406 spin_lock_irqsave(q->queue_lock, flags); 407 blk_abort_request(qc->scsicmd->request); 408 spin_unlock_irqrestore(q->queue_lock, flags); 409 scsi_schedule_eh(qc->scsicmd->device->host); 410 return; 411 } 412 413 /* Internal command, fake a timeout and complete. */ 414 qc->flags &= ~ATA_QCFLAG_ACTIVE; 415 qc->flags |= ATA_QCFLAG_FAILED; 416 qc->err_mask |= AC_ERR_TIMEOUT; 417 waiting = qc->private_data; 418 complete(waiting); 419} 420 421static void sas_task_timedout(unsigned long _task) 422{ 423 struct sas_task *task = (void *) _task; 424 unsigned long flags; 425 426 spin_lock_irqsave(&task->task_state_lock, flags); 427 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) 428 task->task_state_flags |= SAS_TASK_STATE_ABORTED; 429 spin_unlock_irqrestore(&task->task_state_lock, flags); 430 431 complete(&task->completion); 432} 433 434static void sas_disc_task_done(struct sas_task *task) 435{ 436 if (!del_timer(&task->timer)) 437 return; 438 complete(&task->completion); 439} 440 441#define SAS_DEV_TIMEOUT 10 442 443/** 444 * sas_execute_task -- Basic task processing for discovery 445 * @task: the task to be executed 446 * @buffer: pointer to buffer to do I/O 447 * @size: size of @buffer 448 * @dma_dir: DMA direction. DMA_xxx 449 */ 450static int sas_execute_task(struct sas_task *task, void *buffer, int size, 451 enum dma_data_direction dma_dir) 452{ 453 int res = 0; 454 struct scatterlist *scatter = NULL; 455 struct task_status_struct *ts = &task->task_status; 456 int num_scatter = 0; 457 int retries = 0; 458 struct sas_internal *i = 459 to_sas_internal(task->dev->port->ha->core.shost->transportt); 460 461 if (dma_dir != DMA_NONE) { 462 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL); 463 if (!scatter) 464 goto out; 465 466 sg_init_one(scatter, buffer, size); 467 num_scatter = 1; 468 } 469 470 task->task_proto = task->dev->tproto; 471 task->scatter = scatter; 472 task->num_scatter = num_scatter; 473 task->total_xfer_len = size; 474 task->data_dir = dma_dir; 475 task->task_done = sas_disc_task_done; 476 if (dma_dir != DMA_NONE && 477 sas_protocol_ata(task->task_proto)) { 478 task->num_scatter = dma_map_sg(task->dev->port->ha->dev, 479 task->scatter, 480 task->num_scatter, 481 task->data_dir); 482 } 483 484 for (retries = 0; retries < 5; retries++) { 485 task->task_state_flags = SAS_TASK_STATE_PENDING; 486 init_completion(&task->completion); 487 488 task->timer.data = (unsigned long) task; 489 task->timer.function = sas_task_timedout; 490 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ; 491 add_timer(&task->timer); 492 493 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL); 494 if (res) { 495 del_timer(&task->timer); 496 SAS_DPRINTK("executing SAS discovery task failed:%d\n", 497 res); 498 goto ex_err; 499 } 500 wait_for_completion(&task->completion); 501 res = -ECOMM; 502 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) { 503 int res2; 504 SAS_DPRINTK("task aborted, flags:0x%x\n", 505 task->task_state_flags); 506 res2 = i->dft->lldd_abort_task(task); 507 SAS_DPRINTK("came back from abort task\n"); 508 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) { 509 if (res2 == TMF_RESP_FUNC_COMPLETE) 510 continue; /* Retry the task */ 511 else 512 goto ex_err; 513 } 514 } 515 if (task->task_status.stat == SAM_STAT_BUSY || 516 task->task_status.stat == SAM_STAT_TASK_SET_FULL || 517 task->task_status.stat == SAS_QUEUE_FULL) { 518 SAS_DPRINTK("task: q busy, sleeping...\n"); 519 schedule_timeout_interruptible(HZ); 520 } else if (task->task_status.stat == SAM_STAT_CHECK_CONDITION) { 521 struct scsi_sense_hdr shdr; 522 523 if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size, 524 &shdr)) { 525 SAS_DPRINTK("couldn't normalize sense\n"); 526 continue; 527 } 528 if ((shdr.sense_key == 6 && shdr.asc == 0x29) || 529 (shdr.sense_key == 2 && shdr.asc == 4 && 530 shdr.ascq == 1)) { 531 SAS_DPRINTK("device %016llx LUN: %016llx " 532 "powering up or not ready yet, " 533 "sleeping...\n", 534 SAS_ADDR(task->dev->sas_addr), 535 SAS_ADDR(task->ssp_task.LUN)); 536 537 schedule_timeout_interruptible(5*HZ); 538 } else if (shdr.sense_key == 1) { 539 res = 0; 540 break; 541 } else if (shdr.sense_key == 5) { 542 break; 543 } else { 544 SAS_DPRINTK("dev %016llx LUN: %016llx " 545 "sense key:0x%x ASC:0x%x ASCQ:0x%x" 546 "\n", 547 SAS_ADDR(task->dev->sas_addr), 548 SAS_ADDR(task->ssp_task.LUN), 549 shdr.sense_key, 550 shdr.asc, shdr.ascq); 551 } 552 } else if (task->task_status.resp != SAS_TASK_COMPLETE || 553 task->task_status.stat != SAM_STAT_GOOD) { 554 SAS_DPRINTK("task finished with resp:0x%x, " 555 "stat:0x%x\n", 556 task->task_status.resp, 557 task->task_status.stat); 558 goto ex_err; 559 } else { 560 res = 0; 561 break; 562 } 563 } 564ex_err: 565 if (dma_dir != DMA_NONE) { 566 if (sas_protocol_ata(task->task_proto)) 567 dma_unmap_sg(task->dev->port->ha->dev, 568 task->scatter, task->num_scatter, 569 task->data_dir); 570 kfree(scatter); 571 } 572out: 573 return res; 574} 575 576/* ---------- SATA ---------- */ 577 578static void sas_get_ata_command_set(struct domain_device *dev) 579{ 580 struct dev_to_host_fis *fis = 581 (struct dev_to_host_fis *) dev->frame_rcvd; 582 583 if ((fis->sector_count == 1 && /* ATA */ 584 fis->lbal == 1 && 585 fis->lbam == 0 && 586 fis->lbah == 0 && 587 fis->device == 0) 588 || 589 (fis->sector_count == 0 && /* CE-ATA (mATA) */ 590 fis->lbal == 0 && 591 fis->lbam == 0xCE && 592 fis->lbah == 0xAA && 593 (fis->device & ~0x10) == 0)) 594 595 dev->sata_dev.command_set = ATA_COMMAND_SET; 596 597 else if ((fis->interrupt_reason == 1 && /* ATAPI */ 598 fis->lbal == 1 && 599 fis->byte_count_low == 0x14 && 600 fis->byte_count_high == 0xEB && 601 (fis->device & ~0x10) == 0)) 602 603 dev->sata_dev.command_set = ATAPI_COMMAND_SET; 604 605 else if ((fis->sector_count == 1 && /* SEMB */ 606 fis->lbal == 1 && 607 fis->lbam == 0x3C && 608 fis->lbah == 0xC3 && 609 fis->device == 0) 610 || 611 (fis->interrupt_reason == 1 && /* SATA PM */ 612 fis->lbal == 1 && 613 fis->byte_count_low == 0x69 && 614 fis->byte_count_high == 0x96 && 615 (fis->device & ~0x10) == 0)) 616 617 /* Treat it as a superset? */ 618 dev->sata_dev.command_set = ATAPI_COMMAND_SET; 619} 620 621/** 622 * sas_issue_ata_cmd -- Basic SATA command processing for discovery 623 * @dev: the device to send the command to 624 * @command: the command register 625 * @features: the features register 626 * @buffer: pointer to buffer to do I/O 627 * @size: size of @buffer 628 * @dma_dir: DMA direction. DMA_xxx 629 */ 630static int sas_issue_ata_cmd(struct domain_device *dev, u8 command, 631 u8 features, void *buffer, int size, 632 enum dma_data_direction dma_dir) 633{ 634 int res = 0; 635 struct sas_task *task; 636 struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *) 637 &dev->frame_rcvd[0]; 638 639 res = -ENOMEM; 640 task = sas_alloc_task(GFP_KERNEL); 641 if (!task) 642 goto out; 643 644 task->dev = dev; 645 646 task->ata_task.fis.fis_type = 0x27; 647 task->ata_task.fis.command = command; 648 task->ata_task.fis.features = features; 649 task->ata_task.fis.device = d2h_fis->device; 650 task->ata_task.retry_count = 1; 651 652 res = sas_execute_task(task, buffer, size, dma_dir); 653 654 sas_free_task(task); 655out: 656 return res; 657} 658 659#define ATA_IDENTIFY_DEV 0xEC 660#define ATA_IDENTIFY_PACKET_DEV 0xA1 661#define ATA_SET_FEATURES 0xEF 662#define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07 663 664/** 665 * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV) 666 * @dev: STP/SATA device of interest (ATA/ATAPI) 667 * 668 * The LLDD has already been notified of this device, so that we can 669 * send FISes to it. Here we try to get IDENTIFY DEVICE or IDENTIFY 670 * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its 671 * performance for this device. 672 */ 673static int sas_discover_sata_dev(struct domain_device *dev) 674{ 675 int res; 676 __le16 *identify_x; 677 u8 command; 678 679 identify_x = kzalloc(512, GFP_KERNEL); 680 if (!identify_x) 681 return -ENOMEM; 682 683 if (dev->sata_dev.command_set == ATA_COMMAND_SET) { 684 dev->sata_dev.identify_device = identify_x; 685 command = ATA_IDENTIFY_DEV; 686 } else { 687 dev->sata_dev.identify_packet_device = identify_x; 688 command = ATA_IDENTIFY_PACKET_DEV; 689 } 690 691 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512, 692 DMA_FROM_DEVICE); 693 if (res) 694 goto out_err; 695 696 /* lives on the media? */ 697 if (le16_to_cpu(identify_x[0]) & 4) { 698 /* incomplete response */ 699 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to " 700 "dev %llx\n", SAS_ADDR(dev->sas_addr)); 701 if (!(identify_x[83] & cpu_to_le16(1<<6))) 702 goto cont1; 703 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES, 704 ATA_FEATURE_PUP_STBY_SPIN_UP, 705 NULL, 0, DMA_NONE); 706 if (res) 707 goto cont1; 708 709 schedule_timeout_interruptible(5*HZ); /* More time? */ 710 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512, 711 DMA_FROM_DEVICE); 712 if (res) 713 goto out_err; 714 } 715cont1: 716 717 sas_fill_in_rphy(dev, dev->rphy); 718 719 return 0; 720out_err: 721 dev->sata_dev.identify_packet_device = NULL; 722 dev->sata_dev.identify_device = NULL; 723 kfree(identify_x); 724 return res; 725} 726 727static int sas_discover_sata_pm(struct domain_device *dev) 728{ 729 return -ENODEV; 730} 731 732/** 733 * sas_discover_sata -- discover an STP/SATA domain device 734 * @dev: pointer to struct domain_device of interest 735 * 736 * First we notify the LLDD of this device, so we can send frames to 737 * it. Then depending on the type of device we call the appropriate 738 * discover functions. Once device discover is done, we notify the 739 * LLDD so that it can fine-tune its parameters for the device, by 740 * removing it and then adding it. That is, the second time around, 741 * the driver would have certain fields, that it is looking at, set. 742 * Finally we initialize the kobj so that the device can be added to 743 * the system at registration time. Devices directly attached to a HA 744 * port, have no parents. All other devices do, and should have their 745 * "parent" pointer set appropriately before calling this function. 746 */ 747int sas_discover_sata(struct domain_device *dev) 748{ 749 int res; 750 751 sas_get_ata_command_set(dev); 752 753 res = sas_notify_lldd_dev_found(dev); 754 if (res) 755 return res; 756 757 switch (dev->dev_type) { 758 case SATA_DEV: 759 res = sas_discover_sata_dev(dev); 760 break; 761 case SATA_PM: 762 res = sas_discover_sata_pm(dev); 763 break; 764 default: 765 break; 766 } 767 sas_notify_lldd_dev_gone(dev); 768 if (!res) { 769 sas_notify_lldd_dev_found(dev); 770 res = sas_rphy_add(dev->rphy); 771 } 772 773 return res; 774} 775