1 /* 2 * CXL Flash Device Driver 3 * 4 * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation 5 * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation 6 * 7 * Copyright (C) 2015 IBM Corporation 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 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 #include <linux/delay.h> 16 #include <linux/list.h> 17 #include <linux/module.h> 18 #include <linux/pci.h> 19 20 #include <asm/unaligned.h> 21 22 #include <misc/cxl.h> 23 24 #include <scsi/scsi_cmnd.h> 25 #include <scsi/scsi_host.h> 26 #include <uapi/scsi/cxlflash_ioctl.h> 27 28 #include "main.h" 29 #include "sislite.h" 30 #include "common.h" 31 32 MODULE_DESCRIPTION(CXLFLASH_ADAPTER_NAME); 33 MODULE_AUTHOR("Manoj N. Kumar <manoj@linux.vnet.ibm.com>"); 34 MODULE_AUTHOR("Matthew R. Ochs <mrochs@linux.vnet.ibm.com>"); 35 MODULE_LICENSE("GPL"); 36 37 /** 38 * cmd_checkout() - checks out an AFU command 39 * @afu: AFU to checkout from. 40 * 41 * Commands are checked out in a round-robin fashion. Note that since 42 * the command pool is larger than the hardware queue, the majority of 43 * times we will only loop once or twice before getting a command. The 44 * buffer and CDB within the command are initialized (zeroed) prior to 45 * returning. 46 * 47 * Return: The checked out command or NULL when command pool is empty. 48 */ 49 static struct afu_cmd *cmd_checkout(struct afu *afu) 50 { 51 int k, dec = CXLFLASH_NUM_CMDS; 52 struct afu_cmd *cmd; 53 54 while (dec--) { 55 k = (afu->cmd_couts++ & (CXLFLASH_NUM_CMDS - 1)); 56 57 cmd = &afu->cmd[k]; 58 59 if (!atomic_dec_if_positive(&cmd->free)) { 60 pr_devel("%s: returning found index=%d cmd=%p\n", 61 __func__, cmd->slot, cmd); 62 memset(cmd->buf, 0, CMD_BUFSIZE); 63 memset(cmd->rcb.cdb, 0, sizeof(cmd->rcb.cdb)); 64 return cmd; 65 } 66 } 67 68 return NULL; 69 } 70 71 /** 72 * cmd_checkin() - checks in an AFU command 73 * @cmd: AFU command to checkin. 74 * 75 * Safe to pass commands that have already been checked in. Several 76 * internal tracking fields are reset as part of the checkin. Note 77 * that these are intentionally reset prior to toggling the free bit 78 * to avoid clobbering values in the event that the command is checked 79 * out right away. 80 */ 81 static void cmd_checkin(struct afu_cmd *cmd) 82 { 83 cmd->rcb.scp = NULL; 84 cmd->rcb.timeout = 0; 85 cmd->sa.ioasc = 0; 86 cmd->cmd_tmf = false; 87 cmd->sa.host_use[0] = 0; /* clears both completion and retry bytes */ 88 89 if (unlikely(atomic_inc_return(&cmd->free) != 1)) { 90 pr_err("%s: Freeing cmd (%d) that is not in use!\n", 91 __func__, cmd->slot); 92 return; 93 } 94 95 pr_devel("%s: released cmd %p index=%d\n", __func__, cmd, cmd->slot); 96 } 97 98 /** 99 * process_cmd_err() - command error handler 100 * @cmd: AFU command that experienced the error. 101 * @scp: SCSI command associated with the AFU command in error. 102 * 103 * Translates error bits from AFU command to SCSI command results. 104 */ 105 static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp) 106 { 107 struct sisl_ioarcb *ioarcb; 108 struct sisl_ioasa *ioasa; 109 u32 resid; 110 111 if (unlikely(!cmd)) 112 return; 113 114 ioarcb = &(cmd->rcb); 115 ioasa = &(cmd->sa); 116 117 if (ioasa->rc.flags & SISL_RC_FLAGS_UNDERRUN) { 118 resid = ioasa->resid; 119 scsi_set_resid(scp, resid); 120 pr_debug("%s: cmd underrun cmd = %p scp = %p, resid = %d\n", 121 __func__, cmd, scp, resid); 122 } 123 124 if (ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN) { 125 pr_debug("%s: cmd underrun cmd = %p scp = %p\n", 126 __func__, cmd, scp); 127 scp->result = (DID_ERROR << 16); 128 } 129 130 pr_debug("%s: cmd failed afu_rc=%d scsi_rc=%d fc_rc=%d " 131 "afu_extra=0x%X, scsi_extra=0x%X, fc_extra=0x%X\n", 132 __func__, ioasa->rc.afu_rc, ioasa->rc.scsi_rc, 133 ioasa->rc.fc_rc, ioasa->afu_extra, ioasa->scsi_extra, 134 ioasa->fc_extra); 135 136 if (ioasa->rc.scsi_rc) { 137 /* We have a SCSI status */ 138 if (ioasa->rc.flags & SISL_RC_FLAGS_SENSE_VALID) { 139 memcpy(scp->sense_buffer, ioasa->sense_data, 140 SISL_SENSE_DATA_LEN); 141 scp->result = ioasa->rc.scsi_rc; 142 } else 143 scp->result = ioasa->rc.scsi_rc | (DID_ERROR << 16); 144 } 145 146 /* 147 * We encountered an error. Set scp->result based on nature 148 * of error. 149 */ 150 if (ioasa->rc.fc_rc) { 151 /* We have an FC status */ 152 switch (ioasa->rc.fc_rc) { 153 case SISL_FC_RC_LINKDOWN: 154 scp->result = (DID_REQUEUE << 16); 155 break; 156 case SISL_FC_RC_RESID: 157 /* This indicates an FCP resid underrun */ 158 if (!(ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN)) { 159 /* If the SISL_RC_FLAGS_OVERRUN flag was set, 160 * then we will handle this error else where. 161 * If not then we must handle it here. 162 * This is probably an AFU bug. 163 */ 164 scp->result = (DID_ERROR << 16); 165 } 166 break; 167 case SISL_FC_RC_RESIDERR: 168 /* Resid mismatch between adapter and device */ 169 case SISL_FC_RC_TGTABORT: 170 case SISL_FC_RC_ABORTOK: 171 case SISL_FC_RC_ABORTFAIL: 172 case SISL_FC_RC_NOLOGI: 173 case SISL_FC_RC_ABORTPEND: 174 case SISL_FC_RC_WRABORTPEND: 175 case SISL_FC_RC_NOEXP: 176 case SISL_FC_RC_INUSE: 177 scp->result = (DID_ERROR << 16); 178 break; 179 } 180 } 181 182 if (ioasa->rc.afu_rc) { 183 /* We have an AFU error */ 184 switch (ioasa->rc.afu_rc) { 185 case SISL_AFU_RC_NO_CHANNELS: 186 scp->result = (DID_NO_CONNECT << 16); 187 break; 188 case SISL_AFU_RC_DATA_DMA_ERR: 189 switch (ioasa->afu_extra) { 190 case SISL_AFU_DMA_ERR_PAGE_IN: 191 /* Retry */ 192 scp->result = (DID_IMM_RETRY << 16); 193 break; 194 case SISL_AFU_DMA_ERR_INVALID_EA: 195 default: 196 scp->result = (DID_ERROR << 16); 197 } 198 break; 199 case SISL_AFU_RC_OUT_OF_DATA_BUFS: 200 /* Retry */ 201 scp->result = (DID_ALLOC_FAILURE << 16); 202 break; 203 default: 204 scp->result = (DID_ERROR << 16); 205 } 206 } 207 } 208 209 /** 210 * cmd_complete() - command completion handler 211 * @cmd: AFU command that has completed. 212 * 213 * Prepares and submits command that has either completed or timed out to 214 * the SCSI stack. Checks AFU command back into command pool for non-internal 215 * (rcb.scp populated) commands. 216 */ 217 static void cmd_complete(struct afu_cmd *cmd) 218 { 219 struct scsi_cmnd *scp; 220 ulong lock_flags; 221 struct afu *afu = cmd->parent; 222 struct cxlflash_cfg *cfg = afu->parent; 223 bool cmd_is_tmf; 224 225 spin_lock_irqsave(&cmd->slock, lock_flags); 226 cmd->sa.host_use_b[0] |= B_DONE; 227 spin_unlock_irqrestore(&cmd->slock, lock_flags); 228 229 if (cmd->rcb.scp) { 230 scp = cmd->rcb.scp; 231 if (unlikely(cmd->sa.ioasc)) 232 process_cmd_err(cmd, scp); 233 else 234 scp->result = (DID_OK << 16); 235 236 cmd_is_tmf = cmd->cmd_tmf; 237 cmd_checkin(cmd); /* Don't use cmd after here */ 238 239 pr_debug_ratelimited("%s: calling scsi_done scp=%p result=%X " 240 "ioasc=%d\n", __func__, scp, scp->result, 241 cmd->sa.ioasc); 242 243 scsi_dma_unmap(scp); 244 scp->scsi_done(scp); 245 246 if (cmd_is_tmf) { 247 spin_lock_irqsave(&cfg->tmf_slock, lock_flags); 248 cfg->tmf_active = false; 249 wake_up_all_locked(&cfg->tmf_waitq); 250 spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); 251 } 252 } else 253 complete(&cmd->cevent); 254 } 255 256 /** 257 * context_reset() - timeout handler for AFU commands 258 * @cmd: AFU command that timed out. 259 * 260 * Sends a reset to the AFU. 261 */ 262 static void context_reset(struct afu_cmd *cmd) 263 { 264 int nretry = 0; 265 u64 rrin = 0x1; 266 u64 room = 0; 267 struct afu *afu = cmd->parent; 268 ulong lock_flags; 269 270 pr_debug("%s: cmd=%p\n", __func__, cmd); 271 272 spin_lock_irqsave(&cmd->slock, lock_flags); 273 274 /* Already completed? */ 275 if (cmd->sa.host_use_b[0] & B_DONE) { 276 spin_unlock_irqrestore(&cmd->slock, lock_flags); 277 return; 278 } 279 280 cmd->sa.host_use_b[0] |= (B_DONE | B_ERROR | B_TIMEOUT); 281 spin_unlock_irqrestore(&cmd->slock, lock_flags); 282 283 /* 284 * We really want to send this reset at all costs, so spread 285 * out wait time on successive retries for available room. 286 */ 287 do { 288 room = readq_be(&afu->host_map->cmd_room); 289 atomic64_set(&afu->room, room); 290 if (room) 291 goto write_rrin; 292 udelay(nretry); 293 } while (nretry++ < MC_ROOM_RETRY_CNT); 294 295 pr_err("%s: no cmd_room to send reset\n", __func__); 296 return; 297 298 write_rrin: 299 nretry = 0; 300 writeq_be(rrin, &afu->host_map->ioarrin); 301 do { 302 rrin = readq_be(&afu->host_map->ioarrin); 303 if (rrin != 0x1) 304 break; 305 /* Double delay each time */ 306 udelay(2 << nretry); 307 } while (nretry++ < MC_ROOM_RETRY_CNT); 308 } 309 310 /** 311 * send_cmd() - sends an AFU command 312 * @afu: AFU associated with the host. 313 * @cmd: AFU command to send. 314 * 315 * Return: 316 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure 317 */ 318 static int send_cmd(struct afu *afu, struct afu_cmd *cmd) 319 { 320 struct cxlflash_cfg *cfg = afu->parent; 321 struct device *dev = &cfg->dev->dev; 322 int nretry = 0; 323 int rc = 0; 324 u64 room; 325 long newval; 326 327 /* 328 * This routine is used by critical users such an AFU sync and to 329 * send a task management function (TMF). Thus we want to retry a 330 * bit before returning an error. To avoid the performance penalty 331 * of MMIO, we spread the update of 'room' over multiple commands. 332 */ 333 retry: 334 newval = atomic64_dec_if_positive(&afu->room); 335 if (!newval) { 336 do { 337 room = readq_be(&afu->host_map->cmd_room); 338 atomic64_set(&afu->room, room); 339 if (room) 340 goto write_ioarrin; 341 udelay(nretry); 342 } while (nretry++ < MC_ROOM_RETRY_CNT); 343 344 dev_err(dev, "%s: no cmd_room to send 0x%X\n", 345 __func__, cmd->rcb.cdb[0]); 346 347 goto no_room; 348 } else if (unlikely(newval < 0)) { 349 /* This should be rare. i.e. Only if two threads race and 350 * decrement before the MMIO read is done. In this case 351 * just benefit from the other thread having updated 352 * afu->room. 353 */ 354 if (nretry++ < MC_ROOM_RETRY_CNT) { 355 udelay(nretry); 356 goto retry; 357 } 358 359 goto no_room; 360 } 361 362 write_ioarrin: 363 writeq_be((u64)&cmd->rcb, &afu->host_map->ioarrin); 364 out: 365 pr_devel("%s: cmd=%p len=%d ea=%p rc=%d\n", __func__, cmd, 366 cmd->rcb.data_len, (void *)cmd->rcb.data_ea, rc); 367 return rc; 368 369 no_room: 370 afu->read_room = true; 371 kref_get(&cfg->afu->mapcount); 372 schedule_work(&cfg->work_q); 373 rc = SCSI_MLQUEUE_HOST_BUSY; 374 goto out; 375 } 376 377 /** 378 * wait_resp() - polls for a response or timeout to a sent AFU command 379 * @afu: AFU associated with the host. 380 * @cmd: AFU command that was sent. 381 */ 382 static void wait_resp(struct afu *afu, struct afu_cmd *cmd) 383 { 384 ulong timeout = msecs_to_jiffies(cmd->rcb.timeout * 2 * 1000); 385 386 timeout = wait_for_completion_timeout(&cmd->cevent, timeout); 387 if (!timeout) 388 context_reset(cmd); 389 390 if (unlikely(cmd->sa.ioasc != 0)) 391 pr_err("%s: CMD 0x%X failed, IOASC: flags 0x%X, afu_rc 0x%X, " 392 "scsi_rc 0x%X, fc_rc 0x%X\n", __func__, cmd->rcb.cdb[0], 393 cmd->sa.rc.flags, cmd->sa.rc.afu_rc, cmd->sa.rc.scsi_rc, 394 cmd->sa.rc.fc_rc); 395 } 396 397 /** 398 * send_tmf() - sends a Task Management Function (TMF) 399 * @afu: AFU to checkout from. 400 * @scp: SCSI command from stack. 401 * @tmfcmd: TMF command to send. 402 * 403 * Return: 404 * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure 405 */ 406 static int send_tmf(struct afu *afu, struct scsi_cmnd *scp, u64 tmfcmd) 407 { 408 struct afu_cmd *cmd; 409 410 u32 port_sel = scp->device->channel + 1; 411 short lflag = 0; 412 struct Scsi_Host *host = scp->device->host; 413 struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; 414 struct device *dev = &cfg->dev->dev; 415 ulong lock_flags; 416 int rc = 0; 417 ulong to; 418 419 cmd = cmd_checkout(afu); 420 if (unlikely(!cmd)) { 421 dev_err(dev, "%s: could not get a free command\n", __func__); 422 rc = SCSI_MLQUEUE_HOST_BUSY; 423 goto out; 424 } 425 426 /* When Task Management Function is active do not send another */ 427 spin_lock_irqsave(&cfg->tmf_slock, lock_flags); 428 if (cfg->tmf_active) 429 wait_event_interruptible_lock_irq(cfg->tmf_waitq, 430 !cfg->tmf_active, 431 cfg->tmf_slock); 432 cfg->tmf_active = true; 433 cmd->cmd_tmf = true; 434 spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); 435 436 cmd->rcb.ctx_id = afu->ctx_hndl; 437 cmd->rcb.port_sel = port_sel; 438 cmd->rcb.lun_id = lun_to_lunid(scp->device->lun); 439 440 lflag = SISL_REQ_FLAGS_TMF_CMD; 441 442 cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID | 443 SISL_REQ_FLAGS_SUP_UNDERRUN | lflag); 444 445 /* Stash the scp in the reserved field, for reuse during interrupt */ 446 cmd->rcb.scp = scp; 447 448 /* Copy the CDB from the cmd passed in */ 449 memcpy(cmd->rcb.cdb, &tmfcmd, sizeof(tmfcmd)); 450 451 /* Send the command */ 452 rc = send_cmd(afu, cmd); 453 if (unlikely(rc)) { 454 cmd_checkin(cmd); 455 spin_lock_irqsave(&cfg->tmf_slock, lock_flags); 456 cfg->tmf_active = false; 457 spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); 458 goto out; 459 } 460 461 spin_lock_irqsave(&cfg->tmf_slock, lock_flags); 462 to = msecs_to_jiffies(5000); 463 to = wait_event_interruptible_lock_irq_timeout(cfg->tmf_waitq, 464 !cfg->tmf_active, 465 cfg->tmf_slock, 466 to); 467 if (!to) { 468 cfg->tmf_active = false; 469 dev_err(dev, "%s: TMF timed out!\n", __func__); 470 rc = -1; 471 } 472 spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); 473 out: 474 return rc; 475 } 476 477 static void afu_unmap(struct kref *ref) 478 { 479 struct afu *afu = container_of(ref, struct afu, mapcount); 480 481 if (likely(afu->afu_map)) { 482 cxl_psa_unmap((void __iomem *)afu->afu_map); 483 afu->afu_map = NULL; 484 } 485 } 486 487 /** 488 * cxlflash_driver_info() - information handler for this host driver 489 * @host: SCSI host associated with device. 490 * 491 * Return: A string describing the device. 492 */ 493 static const char *cxlflash_driver_info(struct Scsi_Host *host) 494 { 495 return CXLFLASH_ADAPTER_NAME; 496 } 497 498 /** 499 * cxlflash_queuecommand() - sends a mid-layer request 500 * @host: SCSI host associated with device. 501 * @scp: SCSI command to send. 502 * 503 * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure 504 */ 505 static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp) 506 { 507 struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; 508 struct afu *afu = cfg->afu; 509 struct device *dev = &cfg->dev->dev; 510 struct afu_cmd *cmd; 511 u32 port_sel = scp->device->channel + 1; 512 int nseg, i, ncount; 513 struct scatterlist *sg; 514 ulong lock_flags; 515 short lflag = 0; 516 int rc = 0; 517 int kref_got = 0; 518 519 dev_dbg_ratelimited(dev, "%s: (scp=%p) %d/%d/%d/%llu " 520 "cdb=(%08X-%08X-%08X-%08X)\n", 521 __func__, scp, host->host_no, scp->device->channel, 522 scp->device->id, scp->device->lun, 523 get_unaligned_be32(&((u32 *)scp->cmnd)[0]), 524 get_unaligned_be32(&((u32 *)scp->cmnd)[1]), 525 get_unaligned_be32(&((u32 *)scp->cmnd)[2]), 526 get_unaligned_be32(&((u32 *)scp->cmnd)[3])); 527 528 /* 529 * If a Task Management Function is active, wait for it to complete 530 * before continuing with regular commands. 531 */ 532 spin_lock_irqsave(&cfg->tmf_slock, lock_flags); 533 if (cfg->tmf_active) { 534 spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); 535 rc = SCSI_MLQUEUE_HOST_BUSY; 536 goto out; 537 } 538 spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); 539 540 switch (cfg->state) { 541 case STATE_RESET: 542 dev_dbg_ratelimited(dev, "%s: device is in reset!\n", __func__); 543 rc = SCSI_MLQUEUE_HOST_BUSY; 544 goto out; 545 case STATE_FAILTERM: 546 dev_dbg_ratelimited(dev, "%s: device has failed!\n", __func__); 547 scp->result = (DID_NO_CONNECT << 16); 548 scp->scsi_done(scp); 549 rc = 0; 550 goto out; 551 default: 552 break; 553 } 554 555 cmd = cmd_checkout(afu); 556 if (unlikely(!cmd)) { 557 dev_err(dev, "%s: could not get a free command\n", __func__); 558 rc = SCSI_MLQUEUE_HOST_BUSY; 559 goto out; 560 } 561 562 kref_get(&cfg->afu->mapcount); 563 kref_got = 1; 564 565 cmd->rcb.ctx_id = afu->ctx_hndl; 566 cmd->rcb.port_sel = port_sel; 567 cmd->rcb.lun_id = lun_to_lunid(scp->device->lun); 568 569 if (scp->sc_data_direction == DMA_TO_DEVICE) 570 lflag = SISL_REQ_FLAGS_HOST_WRITE; 571 else 572 lflag = SISL_REQ_FLAGS_HOST_READ; 573 574 cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID | 575 SISL_REQ_FLAGS_SUP_UNDERRUN | lflag); 576 577 /* Stash the scp in the reserved field, for reuse during interrupt */ 578 cmd->rcb.scp = scp; 579 580 nseg = scsi_dma_map(scp); 581 if (unlikely(nseg < 0)) { 582 dev_err(dev, "%s: Fail DMA map! nseg=%d\n", 583 __func__, nseg); 584 rc = SCSI_MLQUEUE_HOST_BUSY; 585 goto out; 586 } 587 588 ncount = scsi_sg_count(scp); 589 scsi_for_each_sg(scp, sg, ncount, i) { 590 cmd->rcb.data_len = sg_dma_len(sg); 591 cmd->rcb.data_ea = sg_dma_address(sg); 592 } 593 594 /* Copy the CDB from the scsi_cmnd passed in */ 595 memcpy(cmd->rcb.cdb, scp->cmnd, sizeof(cmd->rcb.cdb)); 596 597 /* Send the command */ 598 rc = send_cmd(afu, cmd); 599 if (unlikely(rc)) { 600 cmd_checkin(cmd); 601 scsi_dma_unmap(scp); 602 } 603 604 out: 605 if (kref_got) 606 kref_put(&afu->mapcount, afu_unmap); 607 pr_devel("%s: returning rc=%d\n", __func__, rc); 608 return rc; 609 } 610 611 /** 612 * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe 613 * @cfg: Internal structure associated with the host. 614 */ 615 static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg *cfg) 616 { 617 struct pci_dev *pdev = cfg->dev; 618 619 if (pci_channel_offline(pdev)) 620 wait_event_timeout(cfg->reset_waitq, 621 !pci_channel_offline(pdev), 622 CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT); 623 } 624 625 /** 626 * free_mem() - free memory associated with the AFU 627 * @cfg: Internal structure associated with the host. 628 */ 629 static void free_mem(struct cxlflash_cfg *cfg) 630 { 631 int i; 632 char *buf = NULL; 633 struct afu *afu = cfg->afu; 634 635 if (cfg->afu) { 636 for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { 637 buf = afu->cmd[i].buf; 638 if (!((u64)buf & (PAGE_SIZE - 1))) 639 free_page((ulong)buf); 640 } 641 642 free_pages((ulong)afu, get_order(sizeof(struct afu))); 643 cfg->afu = NULL; 644 } 645 } 646 647 /** 648 * stop_afu() - stops the AFU command timers and unmaps the MMIO space 649 * @cfg: Internal structure associated with the host. 650 * 651 * Safe to call with AFU in a partially allocated/initialized state. 652 * 653 * Cleans up all state associated with the command queue, and unmaps 654 * the MMIO space. 655 * 656 * - complete() will take care of commands we initiated (they'll be checked 657 * in as part of the cleanup that occurs after the completion) 658 * 659 * - cmd_checkin() will take care of entries that we did not initiate and that 660 * have not (and will not) complete because they are sitting on a [now stale] 661 * hardware queue 662 */ 663 static void stop_afu(struct cxlflash_cfg *cfg) 664 { 665 int i; 666 struct afu *afu = cfg->afu; 667 struct afu_cmd *cmd; 668 669 if (likely(afu)) { 670 for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { 671 cmd = &afu->cmd[i]; 672 complete(&cmd->cevent); 673 if (!atomic_read(&cmd->free)) 674 cmd_checkin(cmd); 675 } 676 677 if (likely(afu->afu_map)) { 678 cxl_psa_unmap((void __iomem *)afu->afu_map); 679 afu->afu_map = NULL; 680 } 681 kref_put(&afu->mapcount, afu_unmap); 682 } 683 } 684 685 /** 686 * term_mc() - terminates the master context 687 * @cfg: Internal structure associated with the host. 688 * @level: Depth of allocation, where to begin waterfall tear down. 689 * 690 * Safe to call with AFU/MC in partially allocated/initialized state. 691 */ 692 static void term_mc(struct cxlflash_cfg *cfg, enum undo_level level) 693 { 694 int rc = 0; 695 struct afu *afu = cfg->afu; 696 struct device *dev = &cfg->dev->dev; 697 698 if (!afu || !cfg->mcctx) { 699 dev_err(dev, "%s: returning from term_mc with NULL afu or MC\n", 700 __func__); 701 return; 702 } 703 704 switch (level) { 705 case UNDO_START: 706 rc = cxl_stop_context(cfg->mcctx); 707 BUG_ON(rc); 708 case UNMAP_THREE: 709 cxl_unmap_afu_irq(cfg->mcctx, 3, afu); 710 case UNMAP_TWO: 711 cxl_unmap_afu_irq(cfg->mcctx, 2, afu); 712 case UNMAP_ONE: 713 cxl_unmap_afu_irq(cfg->mcctx, 1, afu); 714 case FREE_IRQ: 715 cxl_free_afu_irqs(cfg->mcctx); 716 case RELEASE_CONTEXT: 717 cfg->mcctx = NULL; 718 } 719 } 720 721 /** 722 * term_afu() - terminates the AFU 723 * @cfg: Internal structure associated with the host. 724 * 725 * Safe to call with AFU/MC in partially allocated/initialized state. 726 */ 727 static void term_afu(struct cxlflash_cfg *cfg) 728 { 729 if (cfg->afu) 730 stop_afu(cfg); 731 732 term_mc(cfg, UNDO_START); 733 734 pr_debug("%s: returning\n", __func__); 735 } 736 737 /** 738 * cxlflash_remove() - PCI entry point to tear down host 739 * @pdev: PCI device associated with the host. 740 * 741 * Safe to use as a cleanup in partially allocated/initialized state. 742 */ 743 static void cxlflash_remove(struct pci_dev *pdev) 744 { 745 struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); 746 ulong lock_flags; 747 748 /* If a Task Management Function is active, wait for it to complete 749 * before continuing with remove. 750 */ 751 spin_lock_irqsave(&cfg->tmf_slock, lock_flags); 752 if (cfg->tmf_active) 753 wait_event_interruptible_lock_irq(cfg->tmf_waitq, 754 !cfg->tmf_active, 755 cfg->tmf_slock); 756 spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); 757 758 cfg->state = STATE_FAILTERM; 759 cxlflash_stop_term_user_contexts(cfg); 760 761 switch (cfg->init_state) { 762 case INIT_STATE_SCSI: 763 cxlflash_term_local_luns(cfg); 764 scsi_remove_host(cfg->host); 765 /* fall through */ 766 case INIT_STATE_AFU: 767 cancel_work_sync(&cfg->work_q); 768 term_afu(cfg); 769 case INIT_STATE_PCI: 770 pci_disable_device(pdev); 771 case INIT_STATE_NONE: 772 free_mem(cfg); 773 scsi_host_put(cfg->host); 774 break; 775 } 776 777 pr_debug("%s: returning\n", __func__); 778 } 779 780 /** 781 * alloc_mem() - allocates the AFU and its command pool 782 * @cfg: Internal structure associated with the host. 783 * 784 * A partially allocated state remains on failure. 785 * 786 * Return: 787 * 0 on success 788 * -ENOMEM on failure to allocate memory 789 */ 790 static int alloc_mem(struct cxlflash_cfg *cfg) 791 { 792 int rc = 0; 793 int i; 794 char *buf = NULL; 795 struct device *dev = &cfg->dev->dev; 796 797 /* AFU is ~12k, i.e. only one 64k page or up to four 4k pages */ 798 cfg->afu = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 799 get_order(sizeof(struct afu))); 800 if (unlikely(!cfg->afu)) { 801 dev_err(dev, "%s: cannot get %d free pages\n", 802 __func__, get_order(sizeof(struct afu))); 803 rc = -ENOMEM; 804 goto out; 805 } 806 cfg->afu->parent = cfg; 807 cfg->afu->afu_map = NULL; 808 809 for (i = 0; i < CXLFLASH_NUM_CMDS; buf += CMD_BUFSIZE, i++) { 810 if (!((u64)buf & (PAGE_SIZE - 1))) { 811 buf = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO); 812 if (unlikely(!buf)) { 813 dev_err(dev, 814 "%s: Allocate command buffers fail!\n", 815 __func__); 816 rc = -ENOMEM; 817 free_mem(cfg); 818 goto out; 819 } 820 } 821 822 cfg->afu->cmd[i].buf = buf; 823 atomic_set(&cfg->afu->cmd[i].free, 1); 824 cfg->afu->cmd[i].slot = i; 825 } 826 827 out: 828 return rc; 829 } 830 831 /** 832 * init_pci() - initializes the host as a PCI device 833 * @cfg: Internal structure associated with the host. 834 * 835 * Return: 0 on success, -errno on failure 836 */ 837 static int init_pci(struct cxlflash_cfg *cfg) 838 { 839 struct pci_dev *pdev = cfg->dev; 840 int rc = 0; 841 842 rc = pci_enable_device(pdev); 843 if (rc || pci_channel_offline(pdev)) { 844 if (pci_channel_offline(pdev)) { 845 cxlflash_wait_for_pci_err_recovery(cfg); 846 rc = pci_enable_device(pdev); 847 } 848 849 if (rc) { 850 dev_err(&pdev->dev, "%s: Cannot enable adapter\n", 851 __func__); 852 cxlflash_wait_for_pci_err_recovery(cfg); 853 goto out; 854 } 855 } 856 857 out: 858 pr_debug("%s: returning rc=%d\n", __func__, rc); 859 return rc; 860 } 861 862 /** 863 * init_scsi() - adds the host to the SCSI stack and kicks off host scan 864 * @cfg: Internal structure associated with the host. 865 * 866 * Return: 0 on success, -errno on failure 867 */ 868 static int init_scsi(struct cxlflash_cfg *cfg) 869 { 870 struct pci_dev *pdev = cfg->dev; 871 int rc = 0; 872 873 rc = scsi_add_host(cfg->host, &pdev->dev); 874 if (rc) { 875 dev_err(&pdev->dev, "%s: scsi_add_host failed (rc=%d)\n", 876 __func__, rc); 877 goto out; 878 } 879 880 scsi_scan_host(cfg->host); 881 882 out: 883 pr_debug("%s: returning rc=%d\n", __func__, rc); 884 return rc; 885 } 886 887 /** 888 * set_port_online() - transitions the specified host FC port to online state 889 * @fc_regs: Top of MMIO region defined for specified port. 890 * 891 * The provided MMIO region must be mapped prior to call. Online state means 892 * that the FC link layer has synced, completed the handshaking process, and 893 * is ready for login to start. 894 */ 895 static void set_port_online(__be64 __iomem *fc_regs) 896 { 897 u64 cmdcfg; 898 899 cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); 900 cmdcfg &= (~FC_MTIP_CMDCONFIG_OFFLINE); /* clear OFF_LINE */ 901 cmdcfg |= (FC_MTIP_CMDCONFIG_ONLINE); /* set ON_LINE */ 902 writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); 903 } 904 905 /** 906 * set_port_offline() - transitions the specified host FC port to offline state 907 * @fc_regs: Top of MMIO region defined for specified port. 908 * 909 * The provided MMIO region must be mapped prior to call. 910 */ 911 static void set_port_offline(__be64 __iomem *fc_regs) 912 { 913 u64 cmdcfg; 914 915 cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); 916 cmdcfg &= (~FC_MTIP_CMDCONFIG_ONLINE); /* clear ON_LINE */ 917 cmdcfg |= (FC_MTIP_CMDCONFIG_OFFLINE); /* set OFF_LINE */ 918 writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); 919 } 920 921 /** 922 * wait_port_online() - waits for the specified host FC port come online 923 * @fc_regs: Top of MMIO region defined for specified port. 924 * @delay_us: Number of microseconds to delay between reading port status. 925 * @nretry: Number of cycles to retry reading port status. 926 * 927 * The provided MMIO region must be mapped prior to call. This will timeout 928 * when the cable is not plugged in. 929 * 930 * Return: 931 * TRUE (1) when the specified port is online 932 * FALSE (0) when the specified port fails to come online after timeout 933 * -EINVAL when @delay_us is less than 1000 934 */ 935 static int wait_port_online(__be64 __iomem *fc_regs, u32 delay_us, u32 nretry) 936 { 937 u64 status; 938 939 if (delay_us < 1000) { 940 pr_err("%s: invalid delay specified %d\n", __func__, delay_us); 941 return -EINVAL; 942 } 943 944 do { 945 msleep(delay_us / 1000); 946 status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); 947 } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_ONLINE && 948 nretry--); 949 950 return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_ONLINE); 951 } 952 953 /** 954 * wait_port_offline() - waits for the specified host FC port go offline 955 * @fc_regs: Top of MMIO region defined for specified port. 956 * @delay_us: Number of microseconds to delay between reading port status. 957 * @nretry: Number of cycles to retry reading port status. 958 * 959 * The provided MMIO region must be mapped prior to call. 960 * 961 * Return: 962 * TRUE (1) when the specified port is offline 963 * FALSE (0) when the specified port fails to go offline after timeout 964 * -EINVAL when @delay_us is less than 1000 965 */ 966 static int wait_port_offline(__be64 __iomem *fc_regs, u32 delay_us, u32 nretry) 967 { 968 u64 status; 969 970 if (delay_us < 1000) { 971 pr_err("%s: invalid delay specified %d\n", __func__, delay_us); 972 return -EINVAL; 973 } 974 975 do { 976 msleep(delay_us / 1000); 977 status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); 978 } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_OFFLINE && 979 nretry--); 980 981 return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_OFFLINE); 982 } 983 984 /** 985 * afu_set_wwpn() - configures the WWPN for the specified host FC port 986 * @afu: AFU associated with the host that owns the specified FC port. 987 * @port: Port number being configured. 988 * @fc_regs: Top of MMIO region defined for specified port. 989 * @wwpn: The world-wide-port-number previously discovered for port. 990 * 991 * The provided MMIO region must be mapped prior to call. As part of the 992 * sequence to configure the WWPN, the port is toggled offline and then back 993 * online. This toggling action can cause this routine to delay up to a few 994 * seconds. When configured to use the internal LUN feature of the AFU, a 995 * failure to come online is overridden. 996 * 997 * Return: 998 * 0 when the WWPN is successfully written and the port comes back online 999 * -1 when the port fails to go offline or come back up online 1000 */ 1001 static int afu_set_wwpn(struct afu *afu, int port, __be64 __iomem *fc_regs, 1002 u64 wwpn) 1003 { 1004 int rc = 0; 1005 1006 set_port_offline(fc_regs); 1007 1008 if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, 1009 FC_PORT_STATUS_RETRY_CNT)) { 1010 pr_debug("%s: wait on port %d to go offline timed out\n", 1011 __func__, port); 1012 rc = -1; /* but continue on to leave the port back online */ 1013 } 1014 1015 if (rc == 0) 1016 writeq_be(wwpn, &fc_regs[FC_PNAME / 8]); 1017 1018 /* Always return success after programming WWPN */ 1019 rc = 0; 1020 1021 set_port_online(fc_regs); 1022 1023 if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, 1024 FC_PORT_STATUS_RETRY_CNT)) { 1025 pr_err("%s: wait on port %d to go online timed out\n", 1026 __func__, port); 1027 } 1028 1029 pr_debug("%s: returning rc=%d\n", __func__, rc); 1030 1031 return rc; 1032 } 1033 1034 /** 1035 * afu_link_reset() - resets the specified host FC port 1036 * @afu: AFU associated with the host that owns the specified FC port. 1037 * @port: Port number being configured. 1038 * @fc_regs: Top of MMIO region defined for specified port. 1039 * 1040 * The provided MMIO region must be mapped prior to call. The sequence to 1041 * reset the port involves toggling it offline and then back online. This 1042 * action can cause this routine to delay up to a few seconds. An effort 1043 * is made to maintain link with the device by switching to host to use 1044 * the alternate port exclusively while the reset takes place. 1045 * failure to come online is overridden. 1046 */ 1047 static void afu_link_reset(struct afu *afu, int port, __be64 __iomem *fc_regs) 1048 { 1049 u64 port_sel; 1050 1051 /* first switch the AFU to the other links, if any */ 1052 port_sel = readq_be(&afu->afu_map->global.regs.afu_port_sel); 1053 port_sel &= ~(1ULL << port); 1054 writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); 1055 cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); 1056 1057 set_port_offline(fc_regs); 1058 if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, 1059 FC_PORT_STATUS_RETRY_CNT)) 1060 pr_err("%s: wait on port %d to go offline timed out\n", 1061 __func__, port); 1062 1063 set_port_online(fc_regs); 1064 if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, 1065 FC_PORT_STATUS_RETRY_CNT)) 1066 pr_err("%s: wait on port %d to go online timed out\n", 1067 __func__, port); 1068 1069 /* switch back to include this port */ 1070 port_sel |= (1ULL << port); 1071 writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); 1072 cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); 1073 1074 pr_debug("%s: returning port_sel=%lld\n", __func__, port_sel); 1075 } 1076 1077 /* 1078 * Asynchronous interrupt information table 1079 */ 1080 static const struct asyc_intr_info ainfo[] = { 1081 {SISL_ASTATUS_FC0_OTHER, "other error", 0, CLR_FC_ERROR | LINK_RESET}, 1082 {SISL_ASTATUS_FC0_LOGO, "target initiated LOGO", 0, 0}, 1083 {SISL_ASTATUS_FC0_CRC_T, "CRC threshold exceeded", 0, LINK_RESET}, 1084 {SISL_ASTATUS_FC0_LOGI_R, "login timed out, retrying", 0, LINK_RESET}, 1085 {SISL_ASTATUS_FC0_LOGI_F, "login failed", 0, CLR_FC_ERROR}, 1086 {SISL_ASTATUS_FC0_LOGI_S, "login succeeded", 0, SCAN_HOST}, 1087 {SISL_ASTATUS_FC0_LINK_DN, "link down", 0, 0}, 1088 {SISL_ASTATUS_FC0_LINK_UP, "link up", 0, SCAN_HOST}, 1089 {SISL_ASTATUS_FC1_OTHER, "other error", 1, CLR_FC_ERROR | LINK_RESET}, 1090 {SISL_ASTATUS_FC1_LOGO, "target initiated LOGO", 1, 0}, 1091 {SISL_ASTATUS_FC1_CRC_T, "CRC threshold exceeded", 1, LINK_RESET}, 1092 {SISL_ASTATUS_FC1_LOGI_R, "login timed out, retrying", 1, LINK_RESET}, 1093 {SISL_ASTATUS_FC1_LOGI_F, "login failed", 1, CLR_FC_ERROR}, 1094 {SISL_ASTATUS_FC1_LOGI_S, "login succeeded", 1, SCAN_HOST}, 1095 {SISL_ASTATUS_FC1_LINK_DN, "link down", 1, 0}, 1096 {SISL_ASTATUS_FC1_LINK_UP, "link up", 1, SCAN_HOST}, 1097 {0x0, "", 0, 0} /* terminator */ 1098 }; 1099 1100 /** 1101 * find_ainfo() - locates and returns asynchronous interrupt information 1102 * @status: Status code set by AFU on error. 1103 * 1104 * Return: The located information or NULL when the status code is invalid. 1105 */ 1106 static const struct asyc_intr_info *find_ainfo(u64 status) 1107 { 1108 const struct asyc_intr_info *info; 1109 1110 for (info = &ainfo[0]; info->status; info++) 1111 if (info->status == status) 1112 return info; 1113 1114 return NULL; 1115 } 1116 1117 /** 1118 * afu_err_intr_init() - clears and initializes the AFU for error interrupts 1119 * @afu: AFU associated with the host. 1120 */ 1121 static void afu_err_intr_init(struct afu *afu) 1122 { 1123 int i; 1124 u64 reg; 1125 1126 /* global async interrupts: AFU clears afu_ctrl on context exit 1127 * if async interrupts were sent to that context. This prevents 1128 * the AFU form sending further async interrupts when 1129 * there is 1130 * nobody to receive them. 1131 */ 1132 1133 /* mask all */ 1134 writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_mask); 1135 /* set LISN# to send and point to master context */ 1136 reg = ((u64) (((afu->ctx_hndl << 8) | SISL_MSI_ASYNC_ERROR)) << 40); 1137 1138 if (afu->internal_lun) 1139 reg |= 1; /* Bit 63 indicates local lun */ 1140 writeq_be(reg, &afu->afu_map->global.regs.afu_ctrl); 1141 /* clear all */ 1142 writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); 1143 /* unmask bits that are of interest */ 1144 /* note: afu can send an interrupt after this step */ 1145 writeq_be(SISL_ASTATUS_MASK, &afu->afu_map->global.regs.aintr_mask); 1146 /* clear again in case a bit came on after previous clear but before */ 1147 /* unmask */ 1148 writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); 1149 1150 /* Clear/Set internal lun bits */ 1151 reg = readq_be(&afu->afu_map->global.fc_regs[0][FC_CONFIG2 / 8]); 1152 reg &= SISL_FC_INTERNAL_MASK; 1153 if (afu->internal_lun) 1154 reg |= ((u64)(afu->internal_lun - 1) << SISL_FC_INTERNAL_SHIFT); 1155 writeq_be(reg, &afu->afu_map->global.fc_regs[0][FC_CONFIG2 / 8]); 1156 1157 /* now clear FC errors */ 1158 for (i = 0; i < NUM_FC_PORTS; i++) { 1159 writeq_be(0xFFFFFFFFU, 1160 &afu->afu_map->global.fc_regs[i][FC_ERROR / 8]); 1161 writeq_be(0, &afu->afu_map->global.fc_regs[i][FC_ERRCAP / 8]); 1162 } 1163 1164 /* sync interrupts for master's IOARRIN write */ 1165 /* note that unlike asyncs, there can be no pending sync interrupts */ 1166 /* at this time (this is a fresh context and master has not written */ 1167 /* IOARRIN yet), so there is nothing to clear. */ 1168 1169 /* set LISN#, it is always sent to the context that wrote IOARRIN */ 1170 writeq_be(SISL_MSI_SYNC_ERROR, &afu->host_map->ctx_ctrl); 1171 writeq_be(SISL_ISTATUS_MASK, &afu->host_map->intr_mask); 1172 } 1173 1174 /** 1175 * cxlflash_sync_err_irq() - interrupt handler for synchronous errors 1176 * @irq: Interrupt number. 1177 * @data: Private data provided at interrupt registration, the AFU. 1178 * 1179 * Return: Always return IRQ_HANDLED. 1180 */ 1181 static irqreturn_t cxlflash_sync_err_irq(int irq, void *data) 1182 { 1183 struct afu *afu = (struct afu *)data; 1184 u64 reg; 1185 u64 reg_unmasked; 1186 1187 reg = readq_be(&afu->host_map->intr_status); 1188 reg_unmasked = (reg & SISL_ISTATUS_UNMASK); 1189 1190 if (reg_unmasked == 0UL) { 1191 pr_err("%s: %llX: spurious interrupt, intr_status %016llX\n", 1192 __func__, (u64)afu, reg); 1193 goto cxlflash_sync_err_irq_exit; 1194 } 1195 1196 pr_err("%s: %llX: unexpected interrupt, intr_status %016llX\n", 1197 __func__, (u64)afu, reg); 1198 1199 writeq_be(reg_unmasked, &afu->host_map->intr_clear); 1200 1201 cxlflash_sync_err_irq_exit: 1202 pr_debug("%s: returning rc=%d\n", __func__, IRQ_HANDLED); 1203 return IRQ_HANDLED; 1204 } 1205 1206 /** 1207 * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path) 1208 * @irq: Interrupt number. 1209 * @data: Private data provided at interrupt registration, the AFU. 1210 * 1211 * Return: Always return IRQ_HANDLED. 1212 */ 1213 static irqreturn_t cxlflash_rrq_irq(int irq, void *data) 1214 { 1215 struct afu *afu = (struct afu *)data; 1216 struct afu_cmd *cmd; 1217 bool toggle = afu->toggle; 1218 u64 entry, 1219 *hrrq_start = afu->hrrq_start, 1220 *hrrq_end = afu->hrrq_end, 1221 *hrrq_curr = afu->hrrq_curr; 1222 1223 /* Process however many RRQ entries that are ready */ 1224 while (true) { 1225 entry = *hrrq_curr; 1226 1227 if ((entry & SISL_RESP_HANDLE_T_BIT) != toggle) 1228 break; 1229 1230 cmd = (struct afu_cmd *)(entry & ~SISL_RESP_HANDLE_T_BIT); 1231 cmd_complete(cmd); 1232 1233 /* Advance to next entry or wrap and flip the toggle bit */ 1234 if (hrrq_curr < hrrq_end) 1235 hrrq_curr++; 1236 else { 1237 hrrq_curr = hrrq_start; 1238 toggle ^= SISL_RESP_HANDLE_T_BIT; 1239 } 1240 } 1241 1242 afu->hrrq_curr = hrrq_curr; 1243 afu->toggle = toggle; 1244 1245 return IRQ_HANDLED; 1246 } 1247 1248 /** 1249 * cxlflash_async_err_irq() - interrupt handler for asynchronous errors 1250 * @irq: Interrupt number. 1251 * @data: Private data provided at interrupt registration, the AFU. 1252 * 1253 * Return: Always return IRQ_HANDLED. 1254 */ 1255 static irqreturn_t cxlflash_async_err_irq(int irq, void *data) 1256 { 1257 struct afu *afu = (struct afu *)data; 1258 struct cxlflash_cfg *cfg = afu->parent; 1259 struct device *dev = &cfg->dev->dev; 1260 u64 reg_unmasked; 1261 const struct asyc_intr_info *info; 1262 struct sisl_global_map __iomem *global = &afu->afu_map->global; 1263 u64 reg; 1264 u8 port; 1265 int i; 1266 1267 reg = readq_be(&global->regs.aintr_status); 1268 reg_unmasked = (reg & SISL_ASTATUS_UNMASK); 1269 1270 if (reg_unmasked == 0) { 1271 dev_err(dev, "%s: spurious interrupt, aintr_status 0x%016llX\n", 1272 __func__, reg); 1273 goto out; 1274 } 1275 1276 /* FYI, it is 'okay' to clear AFU status before FC_ERROR */ 1277 writeq_be(reg_unmasked, &global->regs.aintr_clear); 1278 1279 /* Check each bit that is on */ 1280 for (i = 0; reg_unmasked; i++, reg_unmasked = (reg_unmasked >> 1)) { 1281 info = find_ainfo(1ULL << i); 1282 if (((reg_unmasked & 0x1) == 0) || !info) 1283 continue; 1284 1285 port = info->port; 1286 1287 dev_err(dev, "%s: FC Port %d -> %s, fc_status 0x%08llX\n", 1288 __func__, port, info->desc, 1289 readq_be(&global->fc_regs[port][FC_STATUS / 8])); 1290 1291 /* 1292 * Do link reset first, some OTHER errors will set FC_ERROR 1293 * again if cleared before or w/o a reset 1294 */ 1295 if (info->action & LINK_RESET) { 1296 dev_err(dev, "%s: FC Port %d: resetting link\n", 1297 __func__, port); 1298 cfg->lr_state = LINK_RESET_REQUIRED; 1299 cfg->lr_port = port; 1300 kref_get(&cfg->afu->mapcount); 1301 schedule_work(&cfg->work_q); 1302 } 1303 1304 if (info->action & CLR_FC_ERROR) { 1305 reg = readq_be(&global->fc_regs[port][FC_ERROR / 8]); 1306 1307 /* 1308 * Since all errors are unmasked, FC_ERROR and FC_ERRCAP 1309 * should be the same and tracing one is sufficient. 1310 */ 1311 1312 dev_err(dev, "%s: fc %d: clearing fc_error 0x%08llX\n", 1313 __func__, port, reg); 1314 1315 writeq_be(reg, &global->fc_regs[port][FC_ERROR / 8]); 1316 writeq_be(0, &global->fc_regs[port][FC_ERRCAP / 8]); 1317 } 1318 1319 if (info->action & SCAN_HOST) { 1320 atomic_inc(&cfg->scan_host_needed); 1321 kref_get(&cfg->afu->mapcount); 1322 schedule_work(&cfg->work_q); 1323 } 1324 } 1325 1326 out: 1327 dev_dbg(dev, "%s: returning IRQ_HANDLED, afu=%p\n", __func__, afu); 1328 return IRQ_HANDLED; 1329 } 1330 1331 /** 1332 * start_context() - starts the master context 1333 * @cfg: Internal structure associated with the host. 1334 * 1335 * Return: A success or failure value from CXL services. 1336 */ 1337 static int start_context(struct cxlflash_cfg *cfg) 1338 { 1339 int rc = 0; 1340 1341 rc = cxl_start_context(cfg->mcctx, 1342 cfg->afu->work.work_element_descriptor, 1343 NULL); 1344 1345 pr_debug("%s: returning rc=%d\n", __func__, rc); 1346 return rc; 1347 } 1348 1349 /** 1350 * read_vpd() - obtains the WWPNs from VPD 1351 * @cfg: Internal structure associated with the host. 1352 * @wwpn: Array of size NUM_FC_PORTS to pass back WWPNs 1353 * 1354 * Return: 0 on success, -errno on failure 1355 */ 1356 static int read_vpd(struct cxlflash_cfg *cfg, u64 wwpn[]) 1357 { 1358 struct pci_dev *dev = cfg->dev; 1359 int rc = 0; 1360 int ro_start, ro_size, i, j, k; 1361 ssize_t vpd_size; 1362 char vpd_data[CXLFLASH_VPD_LEN]; 1363 char tmp_buf[WWPN_BUF_LEN] = { 0 }; 1364 char *wwpn_vpd_tags[NUM_FC_PORTS] = { "V5", "V6" }; 1365 1366 /* Get the VPD data from the device */ 1367 vpd_size = cxl_read_adapter_vpd(dev, vpd_data, sizeof(vpd_data)); 1368 if (unlikely(vpd_size <= 0)) { 1369 dev_err(&dev->dev, "%s: Unable to read VPD (size = %ld)\n", 1370 __func__, vpd_size); 1371 rc = -ENODEV; 1372 goto out; 1373 } 1374 1375 /* Get the read only section offset */ 1376 ro_start = pci_vpd_find_tag(vpd_data, 0, vpd_size, 1377 PCI_VPD_LRDT_RO_DATA); 1378 if (unlikely(ro_start < 0)) { 1379 dev_err(&dev->dev, "%s: VPD Read-only data not found\n", 1380 __func__); 1381 rc = -ENODEV; 1382 goto out; 1383 } 1384 1385 /* Get the read only section size, cap when extends beyond read VPD */ 1386 ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]); 1387 j = ro_size; 1388 i = ro_start + PCI_VPD_LRDT_TAG_SIZE; 1389 if (unlikely((i + j) > vpd_size)) { 1390 pr_debug("%s: Might need to read more VPD (%d > %ld)\n", 1391 __func__, (i + j), vpd_size); 1392 ro_size = vpd_size - i; 1393 } 1394 1395 /* 1396 * Find the offset of the WWPN tag within the read only 1397 * VPD data and validate the found field (partials are 1398 * no good to us). Convert the ASCII data to an integer 1399 * value. Note that we must copy to a temporary buffer 1400 * because the conversion service requires that the ASCII 1401 * string be terminated. 1402 */ 1403 for (k = 0; k < NUM_FC_PORTS; k++) { 1404 j = ro_size; 1405 i = ro_start + PCI_VPD_LRDT_TAG_SIZE; 1406 1407 i = pci_vpd_find_info_keyword(vpd_data, i, j, wwpn_vpd_tags[k]); 1408 if (unlikely(i < 0)) { 1409 dev_err(&dev->dev, "%s: Port %d WWPN not found " 1410 "in VPD\n", __func__, k); 1411 rc = -ENODEV; 1412 goto out; 1413 } 1414 1415 j = pci_vpd_info_field_size(&vpd_data[i]); 1416 i += PCI_VPD_INFO_FLD_HDR_SIZE; 1417 if (unlikely((i + j > vpd_size) || (j != WWPN_LEN))) { 1418 dev_err(&dev->dev, "%s: Port %d WWPN incomplete or " 1419 "VPD corrupt\n", 1420 __func__, k); 1421 rc = -ENODEV; 1422 goto out; 1423 } 1424 1425 memcpy(tmp_buf, &vpd_data[i], WWPN_LEN); 1426 rc = kstrtoul(tmp_buf, WWPN_LEN, (ulong *)&wwpn[k]); 1427 if (unlikely(rc)) { 1428 dev_err(&dev->dev, "%s: Fail to convert port %d WWPN " 1429 "to integer\n", __func__, k); 1430 rc = -ENODEV; 1431 goto out; 1432 } 1433 } 1434 1435 out: 1436 pr_debug("%s: returning rc=%d\n", __func__, rc); 1437 return rc; 1438 } 1439 1440 /** 1441 * init_pcr() - initialize the provisioning and control registers 1442 * @cfg: Internal structure associated with the host. 1443 * 1444 * Also sets up fast access to the mapped registers and initializes AFU 1445 * command fields that never change. 1446 */ 1447 static void init_pcr(struct cxlflash_cfg *cfg) 1448 { 1449 struct afu *afu = cfg->afu; 1450 struct sisl_ctrl_map __iomem *ctrl_map; 1451 int i; 1452 1453 for (i = 0; i < MAX_CONTEXT; i++) { 1454 ctrl_map = &afu->afu_map->ctrls[i].ctrl; 1455 /* Disrupt any clients that could be running */ 1456 /* e.g. clients that survived a master restart */ 1457 writeq_be(0, &ctrl_map->rht_start); 1458 writeq_be(0, &ctrl_map->rht_cnt_id); 1459 writeq_be(0, &ctrl_map->ctx_cap); 1460 } 1461 1462 /* Copy frequently used fields into afu */ 1463 afu->ctx_hndl = (u16) cxl_process_element(cfg->mcctx); 1464 afu->host_map = &afu->afu_map->hosts[afu->ctx_hndl].host; 1465 afu->ctrl_map = &afu->afu_map->ctrls[afu->ctx_hndl].ctrl; 1466 1467 /* Program the Endian Control for the master context */ 1468 writeq_be(SISL_ENDIAN_CTRL, &afu->host_map->endian_ctrl); 1469 1470 /* Initialize cmd fields that never change */ 1471 for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { 1472 afu->cmd[i].rcb.ctx_id = afu->ctx_hndl; 1473 afu->cmd[i].rcb.msi = SISL_MSI_RRQ_UPDATED; 1474 afu->cmd[i].rcb.rrq = 0x0; 1475 } 1476 } 1477 1478 /** 1479 * init_global() - initialize AFU global registers 1480 * @cfg: Internal structure associated with the host. 1481 */ 1482 static int init_global(struct cxlflash_cfg *cfg) 1483 { 1484 struct afu *afu = cfg->afu; 1485 struct device *dev = &cfg->dev->dev; 1486 u64 wwpn[NUM_FC_PORTS]; /* wwpn of AFU ports */ 1487 int i = 0, num_ports = 0; 1488 int rc = 0; 1489 u64 reg; 1490 1491 rc = read_vpd(cfg, &wwpn[0]); 1492 if (rc) { 1493 dev_err(dev, "%s: could not read vpd rc=%d\n", __func__, rc); 1494 goto out; 1495 } 1496 1497 pr_debug("%s: wwpn0=0x%llX wwpn1=0x%llX\n", __func__, wwpn[0], wwpn[1]); 1498 1499 /* Set up RRQ in AFU for master issued cmds */ 1500 writeq_be((u64) afu->hrrq_start, &afu->host_map->rrq_start); 1501 writeq_be((u64) afu->hrrq_end, &afu->host_map->rrq_end); 1502 1503 /* AFU configuration */ 1504 reg = readq_be(&afu->afu_map->global.regs.afu_config); 1505 reg |= SISL_AFUCONF_AR_ALL|SISL_AFUCONF_ENDIAN; 1506 /* enable all auto retry options and control endianness */ 1507 /* leave others at default: */ 1508 /* CTX_CAP write protected, mbox_r does not clear on read and */ 1509 /* checker on if dual afu */ 1510 writeq_be(reg, &afu->afu_map->global.regs.afu_config); 1511 1512 /* Global port select: select either port */ 1513 if (afu->internal_lun) { 1514 /* Only use port 0 */ 1515 writeq_be(PORT0, &afu->afu_map->global.regs.afu_port_sel); 1516 num_ports = NUM_FC_PORTS - 1; 1517 } else { 1518 writeq_be(BOTH_PORTS, &afu->afu_map->global.regs.afu_port_sel); 1519 num_ports = NUM_FC_PORTS; 1520 } 1521 1522 for (i = 0; i < num_ports; i++) { 1523 /* Unmask all errors (but they are still masked at AFU) */ 1524 writeq_be(0, &afu->afu_map->global.fc_regs[i][FC_ERRMSK / 8]); 1525 /* Clear CRC error cnt & set a threshold */ 1526 (void)readq_be(&afu->afu_map->global. 1527 fc_regs[i][FC_CNT_CRCERR / 8]); 1528 writeq_be(MC_CRC_THRESH, &afu->afu_map->global.fc_regs[i] 1529 [FC_CRC_THRESH / 8]); 1530 1531 /* Set WWPNs. If already programmed, wwpn[i] is 0 */ 1532 if (wwpn[i] != 0 && 1533 afu_set_wwpn(afu, i, 1534 &afu->afu_map->global.fc_regs[i][0], 1535 wwpn[i])) { 1536 dev_err(dev, "%s: failed to set WWPN on port %d\n", 1537 __func__, i); 1538 rc = -EIO; 1539 goto out; 1540 } 1541 /* Programming WWPN back to back causes additional 1542 * offline/online transitions and a PLOGI 1543 */ 1544 msleep(100); 1545 } 1546 1547 /* Set up master's own CTX_CAP to allow real mode, host translation */ 1548 /* tables, afu cmds and read/write GSCSI cmds. */ 1549 /* First, unlock ctx_cap write by reading mbox */ 1550 (void)readq_be(&afu->ctrl_map->mbox_r); /* unlock ctx_cap */ 1551 writeq_be((SISL_CTX_CAP_REAL_MODE | SISL_CTX_CAP_HOST_XLATE | 1552 SISL_CTX_CAP_READ_CMD | SISL_CTX_CAP_WRITE_CMD | 1553 SISL_CTX_CAP_AFU_CMD | SISL_CTX_CAP_GSCSI_CMD), 1554 &afu->ctrl_map->ctx_cap); 1555 /* Initialize heartbeat */ 1556 afu->hb = readq_be(&afu->afu_map->global.regs.afu_hb); 1557 1558 out: 1559 return rc; 1560 } 1561 1562 /** 1563 * start_afu() - initializes and starts the AFU 1564 * @cfg: Internal structure associated with the host. 1565 */ 1566 static int start_afu(struct cxlflash_cfg *cfg) 1567 { 1568 struct afu *afu = cfg->afu; 1569 struct afu_cmd *cmd; 1570 1571 int i = 0; 1572 int rc = 0; 1573 1574 for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { 1575 cmd = &afu->cmd[i]; 1576 1577 init_completion(&cmd->cevent); 1578 spin_lock_init(&cmd->slock); 1579 cmd->parent = afu; 1580 } 1581 1582 init_pcr(cfg); 1583 1584 /* After an AFU reset, RRQ entries are stale, clear them */ 1585 memset(&afu->rrq_entry, 0, sizeof(afu->rrq_entry)); 1586 1587 /* Initialize RRQ pointers */ 1588 afu->hrrq_start = &afu->rrq_entry[0]; 1589 afu->hrrq_end = &afu->rrq_entry[NUM_RRQ_ENTRY - 1]; 1590 afu->hrrq_curr = afu->hrrq_start; 1591 afu->toggle = 1; 1592 1593 rc = init_global(cfg); 1594 1595 pr_debug("%s: returning rc=%d\n", __func__, rc); 1596 return rc; 1597 } 1598 1599 /** 1600 * init_mc() - create and register as the master context 1601 * @cfg: Internal structure associated with the host. 1602 * 1603 * Return: 0 on success, -errno on failure 1604 */ 1605 static int init_mc(struct cxlflash_cfg *cfg) 1606 { 1607 struct cxl_context *ctx; 1608 struct device *dev = &cfg->dev->dev; 1609 struct afu *afu = cfg->afu; 1610 int rc = 0; 1611 enum undo_level level; 1612 1613 ctx = cxl_get_context(cfg->dev); 1614 if (unlikely(!ctx)) 1615 return -ENOMEM; 1616 cfg->mcctx = ctx; 1617 1618 /* Set it up as a master with the CXL */ 1619 cxl_set_master(ctx); 1620 1621 /* During initialization reset the AFU to start from a clean slate */ 1622 rc = cxl_afu_reset(cfg->mcctx); 1623 if (unlikely(rc)) { 1624 dev_err(dev, "%s: initial AFU reset failed rc=%d\n", 1625 __func__, rc); 1626 level = RELEASE_CONTEXT; 1627 goto out; 1628 } 1629 1630 rc = cxl_allocate_afu_irqs(ctx, 3); 1631 if (unlikely(rc)) { 1632 dev_err(dev, "%s: call to allocate_afu_irqs failed rc=%d!\n", 1633 __func__, rc); 1634 level = RELEASE_CONTEXT; 1635 goto out; 1636 } 1637 1638 rc = cxl_map_afu_irq(ctx, 1, cxlflash_sync_err_irq, afu, 1639 "SISL_MSI_SYNC_ERROR"); 1640 if (unlikely(rc <= 0)) { 1641 dev_err(dev, "%s: IRQ 1 (SISL_MSI_SYNC_ERROR) map failed!\n", 1642 __func__); 1643 level = FREE_IRQ; 1644 goto out; 1645 } 1646 1647 rc = cxl_map_afu_irq(ctx, 2, cxlflash_rrq_irq, afu, 1648 "SISL_MSI_RRQ_UPDATED"); 1649 if (unlikely(rc <= 0)) { 1650 dev_err(dev, "%s: IRQ 2 (SISL_MSI_RRQ_UPDATED) map failed!\n", 1651 __func__); 1652 level = UNMAP_ONE; 1653 goto out; 1654 } 1655 1656 rc = cxl_map_afu_irq(ctx, 3, cxlflash_async_err_irq, afu, 1657 "SISL_MSI_ASYNC_ERROR"); 1658 if (unlikely(rc <= 0)) { 1659 dev_err(dev, "%s: IRQ 3 (SISL_MSI_ASYNC_ERROR) map failed!\n", 1660 __func__); 1661 level = UNMAP_TWO; 1662 goto out; 1663 } 1664 1665 rc = 0; 1666 1667 /* This performs the equivalent of the CXL_IOCTL_START_WORK. 1668 * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process 1669 * element (pe) that is embedded in the context (ctx) 1670 */ 1671 rc = start_context(cfg); 1672 if (unlikely(rc)) { 1673 dev_err(dev, "%s: start context failed rc=%d\n", __func__, rc); 1674 level = UNMAP_THREE; 1675 goto out; 1676 } 1677 ret: 1678 pr_debug("%s: returning rc=%d\n", __func__, rc); 1679 return rc; 1680 out: 1681 term_mc(cfg, level); 1682 goto ret; 1683 } 1684 1685 /** 1686 * init_afu() - setup as master context and start AFU 1687 * @cfg: Internal structure associated with the host. 1688 * 1689 * This routine is a higher level of control for configuring the 1690 * AFU on probe and reset paths. 1691 * 1692 * Return: 0 on success, -errno on failure 1693 */ 1694 static int init_afu(struct cxlflash_cfg *cfg) 1695 { 1696 u64 reg; 1697 int rc = 0; 1698 struct afu *afu = cfg->afu; 1699 struct device *dev = &cfg->dev->dev; 1700 1701 cxl_perst_reloads_same_image(cfg->cxl_afu, true); 1702 1703 rc = init_mc(cfg); 1704 if (rc) { 1705 dev_err(dev, "%s: call to init_mc failed, rc=%d!\n", 1706 __func__, rc); 1707 goto out; 1708 } 1709 1710 /* Map the entire MMIO space of the AFU */ 1711 afu->afu_map = cxl_psa_map(cfg->mcctx); 1712 if (!afu->afu_map) { 1713 dev_err(dev, "%s: call to cxl_psa_map failed!\n", __func__); 1714 rc = -ENOMEM; 1715 goto err1; 1716 } 1717 kref_init(&afu->mapcount); 1718 1719 /* No byte reverse on reading afu_version or string will be backwards */ 1720 reg = readq(&afu->afu_map->global.regs.afu_version); 1721 memcpy(afu->version, ®, sizeof(reg)); 1722 afu->interface_version = 1723 readq_be(&afu->afu_map->global.regs.interface_version); 1724 if ((afu->interface_version + 1) == 0) { 1725 pr_err("Back level AFU, please upgrade. AFU version %s " 1726 "interface version 0x%llx\n", afu->version, 1727 afu->interface_version); 1728 rc = -EINVAL; 1729 goto err2; 1730 } 1731 1732 pr_debug("%s: afu version %s, interface version 0x%llX\n", __func__, 1733 afu->version, afu->interface_version); 1734 1735 rc = start_afu(cfg); 1736 if (rc) { 1737 dev_err(dev, "%s: call to start_afu failed, rc=%d!\n", 1738 __func__, rc); 1739 goto err2; 1740 } 1741 1742 afu_err_intr_init(cfg->afu); 1743 atomic64_set(&afu->room, readq_be(&afu->host_map->cmd_room)); 1744 1745 /* Restore the LUN mappings */ 1746 cxlflash_restore_luntable(cfg); 1747 out: 1748 pr_debug("%s: returning rc=%d\n", __func__, rc); 1749 return rc; 1750 1751 err2: 1752 kref_put(&afu->mapcount, afu_unmap); 1753 err1: 1754 term_mc(cfg, UNDO_START); 1755 goto out; 1756 } 1757 1758 /** 1759 * cxlflash_afu_sync() - builds and sends an AFU sync command 1760 * @afu: AFU associated with the host. 1761 * @ctx_hndl_u: Identifies context requesting sync. 1762 * @res_hndl_u: Identifies resource requesting sync. 1763 * @mode: Type of sync to issue (lightweight, heavyweight, global). 1764 * 1765 * The AFU can only take 1 sync command at a time. This routine enforces this 1766 * limitation by using a mutex to provide exclusive access to the AFU during 1767 * the sync. This design point requires calling threads to not be on interrupt 1768 * context due to the possibility of sleeping during concurrent sync operations. 1769 * 1770 * AFU sync operations are only necessary and allowed when the device is 1771 * operating normally. When not operating normally, sync requests can occur as 1772 * part of cleaning up resources associated with an adapter prior to removal. 1773 * In this scenario, these requests are simply ignored (safe due to the AFU 1774 * going away). 1775 * 1776 * Return: 1777 * 0 on success 1778 * -1 on failure 1779 */ 1780 int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t ctx_hndl_u, 1781 res_hndl_t res_hndl_u, u8 mode) 1782 { 1783 struct cxlflash_cfg *cfg = afu->parent; 1784 struct device *dev = &cfg->dev->dev; 1785 struct afu_cmd *cmd = NULL; 1786 int rc = 0; 1787 int retry_cnt = 0; 1788 static DEFINE_MUTEX(sync_active); 1789 1790 if (cfg->state != STATE_NORMAL) { 1791 pr_debug("%s: Sync not required! (%u)\n", __func__, cfg->state); 1792 return 0; 1793 } 1794 1795 mutex_lock(&sync_active); 1796 retry: 1797 cmd = cmd_checkout(afu); 1798 if (unlikely(!cmd)) { 1799 retry_cnt++; 1800 udelay(1000 * retry_cnt); 1801 if (retry_cnt < MC_RETRY_CNT) 1802 goto retry; 1803 dev_err(dev, "%s: could not get a free command\n", __func__); 1804 rc = -1; 1805 goto out; 1806 } 1807 1808 pr_debug("%s: afu=%p cmd=%p %d\n", __func__, afu, cmd, ctx_hndl_u); 1809 1810 memset(cmd->rcb.cdb, 0, sizeof(cmd->rcb.cdb)); 1811 1812 cmd->rcb.req_flags = SISL_REQ_FLAGS_AFU_CMD; 1813 cmd->rcb.port_sel = 0x0; /* NA */ 1814 cmd->rcb.lun_id = 0x0; /* NA */ 1815 cmd->rcb.data_len = 0x0; 1816 cmd->rcb.data_ea = 0x0; 1817 cmd->rcb.timeout = MC_AFU_SYNC_TIMEOUT; 1818 1819 cmd->rcb.cdb[0] = 0xC0; /* AFU Sync */ 1820 cmd->rcb.cdb[1] = mode; 1821 1822 /* The cdb is aligned, no unaligned accessors required */ 1823 *((__be16 *)&cmd->rcb.cdb[2]) = cpu_to_be16(ctx_hndl_u); 1824 *((__be32 *)&cmd->rcb.cdb[4]) = cpu_to_be32(res_hndl_u); 1825 1826 rc = send_cmd(afu, cmd); 1827 if (unlikely(rc)) 1828 goto out; 1829 1830 wait_resp(afu, cmd); 1831 1832 /* Set on timeout */ 1833 if (unlikely((cmd->sa.ioasc != 0) || 1834 (cmd->sa.host_use_b[0] & B_ERROR))) 1835 rc = -1; 1836 out: 1837 mutex_unlock(&sync_active); 1838 if (cmd) 1839 cmd_checkin(cmd); 1840 pr_debug("%s: returning rc=%d\n", __func__, rc); 1841 return rc; 1842 } 1843 1844 /** 1845 * afu_reset() - resets the AFU 1846 * @cfg: Internal structure associated with the host. 1847 * 1848 * Return: 0 on success, -errno on failure 1849 */ 1850 static int afu_reset(struct cxlflash_cfg *cfg) 1851 { 1852 int rc = 0; 1853 /* Stop the context before the reset. Since the context is 1854 * no longer available restart it after the reset is complete 1855 */ 1856 1857 term_afu(cfg); 1858 1859 rc = init_afu(cfg); 1860 1861 pr_debug("%s: returning rc=%d\n", __func__, rc); 1862 return rc; 1863 } 1864 1865 /** 1866 * cxlflash_eh_device_reset_handler() - reset a single LUN 1867 * @scp: SCSI command to send. 1868 * 1869 * Return: 1870 * SUCCESS as defined in scsi/scsi.h 1871 * FAILED as defined in scsi/scsi.h 1872 */ 1873 static int cxlflash_eh_device_reset_handler(struct scsi_cmnd *scp) 1874 { 1875 int rc = SUCCESS; 1876 struct Scsi_Host *host = scp->device->host; 1877 struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; 1878 struct afu *afu = cfg->afu; 1879 int rcr = 0; 1880 1881 pr_debug("%s: (scp=%p) %d/%d/%d/%llu " 1882 "cdb=(%08X-%08X-%08X-%08X)\n", __func__, scp, 1883 host->host_no, scp->device->channel, 1884 scp->device->id, scp->device->lun, 1885 get_unaligned_be32(&((u32 *)scp->cmnd)[0]), 1886 get_unaligned_be32(&((u32 *)scp->cmnd)[1]), 1887 get_unaligned_be32(&((u32 *)scp->cmnd)[2]), 1888 get_unaligned_be32(&((u32 *)scp->cmnd)[3])); 1889 1890 retry: 1891 switch (cfg->state) { 1892 case STATE_NORMAL: 1893 rcr = send_tmf(afu, scp, TMF_LUN_RESET); 1894 if (unlikely(rcr)) 1895 rc = FAILED; 1896 break; 1897 case STATE_RESET: 1898 wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); 1899 goto retry; 1900 default: 1901 rc = FAILED; 1902 break; 1903 } 1904 1905 pr_debug("%s: returning rc=%d\n", __func__, rc); 1906 return rc; 1907 } 1908 1909 /** 1910 * cxlflash_eh_host_reset_handler() - reset the host adapter 1911 * @scp: SCSI command from stack identifying host. 1912 * 1913 * Return: 1914 * SUCCESS as defined in scsi/scsi.h 1915 * FAILED as defined in scsi/scsi.h 1916 */ 1917 static int cxlflash_eh_host_reset_handler(struct scsi_cmnd *scp) 1918 { 1919 int rc = SUCCESS; 1920 int rcr = 0; 1921 struct Scsi_Host *host = scp->device->host; 1922 struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; 1923 1924 pr_debug("%s: (scp=%p) %d/%d/%d/%llu " 1925 "cdb=(%08X-%08X-%08X-%08X)\n", __func__, scp, 1926 host->host_no, scp->device->channel, 1927 scp->device->id, scp->device->lun, 1928 get_unaligned_be32(&((u32 *)scp->cmnd)[0]), 1929 get_unaligned_be32(&((u32 *)scp->cmnd)[1]), 1930 get_unaligned_be32(&((u32 *)scp->cmnd)[2]), 1931 get_unaligned_be32(&((u32 *)scp->cmnd)[3])); 1932 1933 switch (cfg->state) { 1934 case STATE_NORMAL: 1935 cfg->state = STATE_RESET; 1936 cxlflash_mark_contexts_error(cfg); 1937 rcr = afu_reset(cfg); 1938 if (rcr) { 1939 rc = FAILED; 1940 cfg->state = STATE_FAILTERM; 1941 } else 1942 cfg->state = STATE_NORMAL; 1943 wake_up_all(&cfg->reset_waitq); 1944 break; 1945 case STATE_RESET: 1946 wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); 1947 if (cfg->state == STATE_NORMAL) 1948 break; 1949 /* fall through */ 1950 default: 1951 rc = FAILED; 1952 break; 1953 } 1954 1955 pr_debug("%s: returning rc=%d\n", __func__, rc); 1956 return rc; 1957 } 1958 1959 /** 1960 * cxlflash_change_queue_depth() - change the queue depth for the device 1961 * @sdev: SCSI device destined for queue depth change. 1962 * @qdepth: Requested queue depth value to set. 1963 * 1964 * The requested queue depth is capped to the maximum supported value. 1965 * 1966 * Return: The actual queue depth set. 1967 */ 1968 static int cxlflash_change_queue_depth(struct scsi_device *sdev, int qdepth) 1969 { 1970 1971 if (qdepth > CXLFLASH_MAX_CMDS_PER_LUN) 1972 qdepth = CXLFLASH_MAX_CMDS_PER_LUN; 1973 1974 scsi_change_queue_depth(sdev, qdepth); 1975 return sdev->queue_depth; 1976 } 1977 1978 /** 1979 * cxlflash_show_port_status() - queries and presents the current port status 1980 * @port: Desired port for status reporting. 1981 * @afu: AFU owning the specified port. 1982 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. 1983 * 1984 * Return: The size of the ASCII string returned in @buf. 1985 */ 1986 static ssize_t cxlflash_show_port_status(u32 port, struct afu *afu, char *buf) 1987 { 1988 char *disp_status; 1989 u64 status; 1990 __be64 __iomem *fc_regs; 1991 1992 if (port >= NUM_FC_PORTS) 1993 return 0; 1994 1995 fc_regs = &afu->afu_map->global.fc_regs[port][0]; 1996 status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); 1997 status &= FC_MTIP_STATUS_MASK; 1998 1999 if (status == FC_MTIP_STATUS_ONLINE) 2000 disp_status = "online"; 2001 else if (status == FC_MTIP_STATUS_OFFLINE) 2002 disp_status = "offline"; 2003 else 2004 disp_status = "unknown"; 2005 2006 return scnprintf(buf, PAGE_SIZE, "%s\n", disp_status); 2007 } 2008 2009 /** 2010 * port0_show() - queries and presents the current status of port 0 2011 * @dev: Generic device associated with the host owning the port. 2012 * @attr: Device attribute representing the port. 2013 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. 2014 * 2015 * Return: The size of the ASCII string returned in @buf. 2016 */ 2017 static ssize_t port0_show(struct device *dev, 2018 struct device_attribute *attr, 2019 char *buf) 2020 { 2021 struct Scsi_Host *shost = class_to_shost(dev); 2022 struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; 2023 struct afu *afu = cfg->afu; 2024 2025 return cxlflash_show_port_status(0, afu, buf); 2026 } 2027 2028 /** 2029 * port1_show() - queries and presents the current status of port 1 2030 * @dev: Generic device associated with the host owning the port. 2031 * @attr: Device attribute representing the port. 2032 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. 2033 * 2034 * Return: The size of the ASCII string returned in @buf. 2035 */ 2036 static ssize_t port1_show(struct device *dev, 2037 struct device_attribute *attr, 2038 char *buf) 2039 { 2040 struct Scsi_Host *shost = class_to_shost(dev); 2041 struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; 2042 struct afu *afu = cfg->afu; 2043 2044 return cxlflash_show_port_status(1, afu, buf); 2045 } 2046 2047 /** 2048 * lun_mode_show() - presents the current LUN mode of the host 2049 * @dev: Generic device associated with the host. 2050 * @attr: Device attribute representing the LUN mode. 2051 * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII. 2052 * 2053 * Return: The size of the ASCII string returned in @buf. 2054 */ 2055 static ssize_t lun_mode_show(struct device *dev, 2056 struct device_attribute *attr, char *buf) 2057 { 2058 struct Scsi_Host *shost = class_to_shost(dev); 2059 struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; 2060 struct afu *afu = cfg->afu; 2061 2062 return scnprintf(buf, PAGE_SIZE, "%u\n", afu->internal_lun); 2063 } 2064 2065 /** 2066 * lun_mode_store() - sets the LUN mode of the host 2067 * @dev: Generic device associated with the host. 2068 * @attr: Device attribute representing the LUN mode. 2069 * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII. 2070 * @count: Length of data resizing in @buf. 2071 * 2072 * The CXL Flash AFU supports a dummy LUN mode where the external 2073 * links and storage are not required. Space on the FPGA is used 2074 * to create 1 or 2 small LUNs which are presented to the system 2075 * as if they were a normal storage device. This feature is useful 2076 * during development and also provides manufacturing with a way 2077 * to test the AFU without an actual device. 2078 * 2079 * 0 = external LUN[s] (default) 2080 * 1 = internal LUN (1 x 64K, 512B blocks, id 0) 2081 * 2 = internal LUN (1 x 64K, 4K blocks, id 0) 2082 * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1) 2083 * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1) 2084 * 2085 * Return: The size of the ASCII string returned in @buf. 2086 */ 2087 static ssize_t lun_mode_store(struct device *dev, 2088 struct device_attribute *attr, 2089 const char *buf, size_t count) 2090 { 2091 struct Scsi_Host *shost = class_to_shost(dev); 2092 struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; 2093 struct afu *afu = cfg->afu; 2094 int rc; 2095 u32 lun_mode; 2096 2097 rc = kstrtouint(buf, 10, &lun_mode); 2098 if (!rc && (lun_mode < 5) && (lun_mode != afu->internal_lun)) { 2099 afu->internal_lun = lun_mode; 2100 2101 /* 2102 * When configured for internal LUN, there is only one channel, 2103 * channel number 0, else there will be 2 (default). 2104 */ 2105 if (afu->internal_lun) 2106 shost->max_channel = 0; 2107 else 2108 shost->max_channel = NUM_FC_PORTS - 1; 2109 2110 afu_reset(cfg); 2111 scsi_scan_host(cfg->host); 2112 } 2113 2114 return count; 2115 } 2116 2117 /** 2118 * ioctl_version_show() - presents the current ioctl version of the host 2119 * @dev: Generic device associated with the host. 2120 * @attr: Device attribute representing the ioctl version. 2121 * @buf: Buffer of length PAGE_SIZE to report back the ioctl version. 2122 * 2123 * Return: The size of the ASCII string returned in @buf. 2124 */ 2125 static ssize_t ioctl_version_show(struct device *dev, 2126 struct device_attribute *attr, char *buf) 2127 { 2128 return scnprintf(buf, PAGE_SIZE, "%u\n", DK_CXLFLASH_VERSION_0); 2129 } 2130 2131 /** 2132 * cxlflash_show_port_lun_table() - queries and presents the port LUN table 2133 * @port: Desired port for status reporting. 2134 * @afu: AFU owning the specified port. 2135 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. 2136 * 2137 * Return: The size of the ASCII string returned in @buf. 2138 */ 2139 static ssize_t cxlflash_show_port_lun_table(u32 port, 2140 struct afu *afu, 2141 char *buf) 2142 { 2143 int i; 2144 ssize_t bytes = 0; 2145 __be64 __iomem *fc_port; 2146 2147 if (port >= NUM_FC_PORTS) 2148 return 0; 2149 2150 fc_port = &afu->afu_map->global.fc_port[port][0]; 2151 2152 for (i = 0; i < CXLFLASH_NUM_VLUNS; i++) 2153 bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes, 2154 "%03d: %016llX\n", i, readq_be(&fc_port[i])); 2155 return bytes; 2156 } 2157 2158 /** 2159 * port0_lun_table_show() - presents the current LUN table of port 0 2160 * @dev: Generic device associated with the host owning the port. 2161 * @attr: Device attribute representing the port. 2162 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. 2163 * 2164 * Return: The size of the ASCII string returned in @buf. 2165 */ 2166 static ssize_t port0_lun_table_show(struct device *dev, 2167 struct device_attribute *attr, 2168 char *buf) 2169 { 2170 struct Scsi_Host *shost = class_to_shost(dev); 2171 struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; 2172 struct afu *afu = cfg->afu; 2173 2174 return cxlflash_show_port_lun_table(0, afu, buf); 2175 } 2176 2177 /** 2178 * port1_lun_table_show() - presents the current LUN table of port 1 2179 * @dev: Generic device associated with the host owning the port. 2180 * @attr: Device attribute representing the port. 2181 * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. 2182 * 2183 * Return: The size of the ASCII string returned in @buf. 2184 */ 2185 static ssize_t port1_lun_table_show(struct device *dev, 2186 struct device_attribute *attr, 2187 char *buf) 2188 { 2189 struct Scsi_Host *shost = class_to_shost(dev); 2190 struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; 2191 struct afu *afu = cfg->afu; 2192 2193 return cxlflash_show_port_lun_table(1, afu, buf); 2194 } 2195 2196 /** 2197 * mode_show() - presents the current mode of the device 2198 * @dev: Generic device associated with the device. 2199 * @attr: Device attribute representing the device mode. 2200 * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII. 2201 * 2202 * Return: The size of the ASCII string returned in @buf. 2203 */ 2204 static ssize_t mode_show(struct device *dev, 2205 struct device_attribute *attr, char *buf) 2206 { 2207 struct scsi_device *sdev = to_scsi_device(dev); 2208 2209 return scnprintf(buf, PAGE_SIZE, "%s\n", 2210 sdev->hostdata ? "superpipe" : "legacy"); 2211 } 2212 2213 /* 2214 * Host attributes 2215 */ 2216 static DEVICE_ATTR_RO(port0); 2217 static DEVICE_ATTR_RO(port1); 2218 static DEVICE_ATTR_RW(lun_mode); 2219 static DEVICE_ATTR_RO(ioctl_version); 2220 static DEVICE_ATTR_RO(port0_lun_table); 2221 static DEVICE_ATTR_RO(port1_lun_table); 2222 2223 static struct device_attribute *cxlflash_host_attrs[] = { 2224 &dev_attr_port0, 2225 &dev_attr_port1, 2226 &dev_attr_lun_mode, 2227 &dev_attr_ioctl_version, 2228 &dev_attr_port0_lun_table, 2229 &dev_attr_port1_lun_table, 2230 NULL 2231 }; 2232 2233 /* 2234 * Device attributes 2235 */ 2236 static DEVICE_ATTR_RO(mode); 2237 2238 static struct device_attribute *cxlflash_dev_attrs[] = { 2239 &dev_attr_mode, 2240 NULL 2241 }; 2242 2243 /* 2244 * Host template 2245 */ 2246 static struct scsi_host_template driver_template = { 2247 .module = THIS_MODULE, 2248 .name = CXLFLASH_ADAPTER_NAME, 2249 .info = cxlflash_driver_info, 2250 .ioctl = cxlflash_ioctl, 2251 .proc_name = CXLFLASH_NAME, 2252 .queuecommand = cxlflash_queuecommand, 2253 .eh_device_reset_handler = cxlflash_eh_device_reset_handler, 2254 .eh_host_reset_handler = cxlflash_eh_host_reset_handler, 2255 .change_queue_depth = cxlflash_change_queue_depth, 2256 .cmd_per_lun = CXLFLASH_MAX_CMDS_PER_LUN, 2257 .can_queue = CXLFLASH_MAX_CMDS, 2258 .this_id = -1, 2259 .sg_tablesize = SG_NONE, /* No scatter gather support */ 2260 .max_sectors = CXLFLASH_MAX_SECTORS, 2261 .use_clustering = ENABLE_CLUSTERING, 2262 .shost_attrs = cxlflash_host_attrs, 2263 .sdev_attrs = cxlflash_dev_attrs, 2264 }; 2265 2266 /* 2267 * Device dependent values 2268 */ 2269 static struct dev_dependent_vals dev_corsa_vals = { CXLFLASH_MAX_SECTORS }; 2270 static struct dev_dependent_vals dev_flash_gt_vals = { CXLFLASH_MAX_SECTORS }; 2271 2272 /* 2273 * PCI device binding table 2274 */ 2275 static struct pci_device_id cxlflash_pci_table[] = { 2276 {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CORSA, 2277 PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_corsa_vals}, 2278 {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_FLASH_GT, 2279 PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_flash_gt_vals}, 2280 {} 2281 }; 2282 2283 MODULE_DEVICE_TABLE(pci, cxlflash_pci_table); 2284 2285 /** 2286 * cxlflash_worker_thread() - work thread handler for the AFU 2287 * @work: Work structure contained within cxlflash associated with host. 2288 * 2289 * Handles the following events: 2290 * - Link reset which cannot be performed on interrupt context due to 2291 * blocking up to a few seconds 2292 * - Read AFU command room 2293 * - Rescan the host 2294 */ 2295 static void cxlflash_worker_thread(struct work_struct *work) 2296 { 2297 struct cxlflash_cfg *cfg = container_of(work, struct cxlflash_cfg, 2298 work_q); 2299 struct afu *afu = cfg->afu; 2300 struct device *dev = &cfg->dev->dev; 2301 int port; 2302 ulong lock_flags; 2303 2304 /* Avoid MMIO if the device has failed */ 2305 2306 if (cfg->state != STATE_NORMAL) 2307 return; 2308 2309 spin_lock_irqsave(cfg->host->host_lock, lock_flags); 2310 2311 if (cfg->lr_state == LINK_RESET_REQUIRED) { 2312 port = cfg->lr_port; 2313 if (port < 0) 2314 dev_err(dev, "%s: invalid port index %d\n", 2315 __func__, port); 2316 else { 2317 spin_unlock_irqrestore(cfg->host->host_lock, 2318 lock_flags); 2319 2320 /* The reset can block... */ 2321 afu_link_reset(afu, port, 2322 &afu->afu_map->global.fc_regs[port][0]); 2323 spin_lock_irqsave(cfg->host->host_lock, lock_flags); 2324 } 2325 2326 cfg->lr_state = LINK_RESET_COMPLETE; 2327 } 2328 2329 if (afu->read_room) { 2330 atomic64_set(&afu->room, readq_be(&afu->host_map->cmd_room)); 2331 afu->read_room = false; 2332 } 2333 2334 spin_unlock_irqrestore(cfg->host->host_lock, lock_flags); 2335 2336 if (atomic_dec_if_positive(&cfg->scan_host_needed) >= 0) 2337 scsi_scan_host(cfg->host); 2338 kref_put(&afu->mapcount, afu_unmap); 2339 } 2340 2341 /** 2342 * cxlflash_probe() - PCI entry point to add host 2343 * @pdev: PCI device associated with the host. 2344 * @dev_id: PCI device id associated with device. 2345 * 2346 * Return: 0 on success, -errno on failure 2347 */ 2348 static int cxlflash_probe(struct pci_dev *pdev, 2349 const struct pci_device_id *dev_id) 2350 { 2351 struct Scsi_Host *host; 2352 struct cxlflash_cfg *cfg = NULL; 2353 struct dev_dependent_vals *ddv; 2354 int rc = 0; 2355 2356 dev_dbg(&pdev->dev, "%s: Found CXLFLASH with IRQ: %d\n", 2357 __func__, pdev->irq); 2358 2359 ddv = (struct dev_dependent_vals *)dev_id->driver_data; 2360 driver_template.max_sectors = ddv->max_sectors; 2361 2362 host = scsi_host_alloc(&driver_template, sizeof(struct cxlflash_cfg)); 2363 if (!host) { 2364 dev_err(&pdev->dev, "%s: call to scsi_host_alloc failed!\n", 2365 __func__); 2366 rc = -ENOMEM; 2367 goto out; 2368 } 2369 2370 host->max_id = CXLFLASH_MAX_NUM_TARGETS_PER_BUS; 2371 host->max_lun = CXLFLASH_MAX_NUM_LUNS_PER_TARGET; 2372 host->max_channel = NUM_FC_PORTS - 1; 2373 host->unique_id = host->host_no; 2374 host->max_cmd_len = CXLFLASH_MAX_CDB_LEN; 2375 2376 cfg = (struct cxlflash_cfg *)host->hostdata; 2377 cfg->host = host; 2378 rc = alloc_mem(cfg); 2379 if (rc) { 2380 dev_err(&pdev->dev, "%s: call to alloc_mem failed!\n", 2381 __func__); 2382 rc = -ENOMEM; 2383 scsi_host_put(cfg->host); 2384 goto out; 2385 } 2386 2387 cfg->init_state = INIT_STATE_NONE; 2388 cfg->dev = pdev; 2389 cfg->cxl_fops = cxlflash_cxl_fops; 2390 2391 /* 2392 * The promoted LUNs move to the top of the LUN table. The rest stay 2393 * on the bottom half. The bottom half grows from the end 2394 * (index = 255), whereas the top half grows from the beginning 2395 * (index = 0). 2396 */ 2397 cfg->promote_lun_index = 0; 2398 cfg->last_lun_index[0] = CXLFLASH_NUM_VLUNS/2 - 1; 2399 cfg->last_lun_index[1] = CXLFLASH_NUM_VLUNS/2 - 1; 2400 2401 cfg->dev_id = (struct pci_device_id *)dev_id; 2402 2403 init_waitqueue_head(&cfg->tmf_waitq); 2404 init_waitqueue_head(&cfg->reset_waitq); 2405 2406 INIT_WORK(&cfg->work_q, cxlflash_worker_thread); 2407 cfg->lr_state = LINK_RESET_INVALID; 2408 cfg->lr_port = -1; 2409 spin_lock_init(&cfg->tmf_slock); 2410 mutex_init(&cfg->ctx_tbl_list_mutex); 2411 mutex_init(&cfg->ctx_recovery_mutex); 2412 init_rwsem(&cfg->ioctl_rwsem); 2413 INIT_LIST_HEAD(&cfg->ctx_err_recovery); 2414 INIT_LIST_HEAD(&cfg->lluns); 2415 2416 pci_set_drvdata(pdev, cfg); 2417 2418 cfg->cxl_afu = cxl_pci_to_afu(pdev); 2419 2420 rc = init_pci(cfg); 2421 if (rc) { 2422 dev_err(&pdev->dev, "%s: call to init_pci " 2423 "failed rc=%d!\n", __func__, rc); 2424 goto out_remove; 2425 } 2426 cfg->init_state = INIT_STATE_PCI; 2427 2428 rc = init_afu(cfg); 2429 if (rc) { 2430 dev_err(&pdev->dev, "%s: call to init_afu " 2431 "failed rc=%d!\n", __func__, rc); 2432 goto out_remove; 2433 } 2434 cfg->init_state = INIT_STATE_AFU; 2435 2436 rc = init_scsi(cfg); 2437 if (rc) { 2438 dev_err(&pdev->dev, "%s: call to init_scsi " 2439 "failed rc=%d!\n", __func__, rc); 2440 goto out_remove; 2441 } 2442 cfg->init_state = INIT_STATE_SCSI; 2443 2444 out: 2445 pr_debug("%s: returning rc=%d\n", __func__, rc); 2446 return rc; 2447 2448 out_remove: 2449 cxlflash_remove(pdev); 2450 goto out; 2451 } 2452 2453 /** 2454 * drain_ioctls() - wait until all currently executing ioctls have completed 2455 * @cfg: Internal structure associated with the host. 2456 * 2457 * Obtain write access to read/write semaphore that wraps ioctl 2458 * handling to 'drain' ioctls currently executing. 2459 */ 2460 static void drain_ioctls(struct cxlflash_cfg *cfg) 2461 { 2462 down_write(&cfg->ioctl_rwsem); 2463 up_write(&cfg->ioctl_rwsem); 2464 } 2465 2466 /** 2467 * cxlflash_pci_error_detected() - called when a PCI error is detected 2468 * @pdev: PCI device struct. 2469 * @state: PCI channel state. 2470 * 2471 * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT 2472 */ 2473 static pci_ers_result_t cxlflash_pci_error_detected(struct pci_dev *pdev, 2474 pci_channel_state_t state) 2475 { 2476 int rc = 0; 2477 struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); 2478 struct device *dev = &cfg->dev->dev; 2479 2480 dev_dbg(dev, "%s: pdev=%p state=%u\n", __func__, pdev, state); 2481 2482 switch (state) { 2483 case pci_channel_io_frozen: 2484 cfg->state = STATE_RESET; 2485 scsi_block_requests(cfg->host); 2486 drain_ioctls(cfg); 2487 rc = cxlflash_mark_contexts_error(cfg); 2488 if (unlikely(rc)) 2489 dev_err(dev, "%s: Failed to mark user contexts!(%d)\n", 2490 __func__, rc); 2491 stop_afu(cfg); 2492 term_mc(cfg, UNDO_START); 2493 return PCI_ERS_RESULT_NEED_RESET; 2494 case pci_channel_io_perm_failure: 2495 cfg->state = STATE_FAILTERM; 2496 wake_up_all(&cfg->reset_waitq); 2497 scsi_unblock_requests(cfg->host); 2498 return PCI_ERS_RESULT_DISCONNECT; 2499 default: 2500 break; 2501 } 2502 return PCI_ERS_RESULT_NEED_RESET; 2503 } 2504 2505 /** 2506 * cxlflash_pci_slot_reset() - called when PCI slot has been reset 2507 * @pdev: PCI device struct. 2508 * 2509 * This routine is called by the pci error recovery code after the PCI 2510 * slot has been reset, just before we should resume normal operations. 2511 * 2512 * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT 2513 */ 2514 static pci_ers_result_t cxlflash_pci_slot_reset(struct pci_dev *pdev) 2515 { 2516 int rc = 0; 2517 struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); 2518 struct device *dev = &cfg->dev->dev; 2519 2520 dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev); 2521 2522 rc = init_afu(cfg); 2523 if (unlikely(rc)) { 2524 dev_err(dev, "%s: EEH recovery failed! (%d)\n", __func__, rc); 2525 return PCI_ERS_RESULT_DISCONNECT; 2526 } 2527 2528 return PCI_ERS_RESULT_RECOVERED; 2529 } 2530 2531 /** 2532 * cxlflash_pci_resume() - called when normal operation can resume 2533 * @pdev: PCI device struct 2534 */ 2535 static void cxlflash_pci_resume(struct pci_dev *pdev) 2536 { 2537 struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); 2538 struct device *dev = &cfg->dev->dev; 2539 2540 dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev); 2541 2542 cfg->state = STATE_NORMAL; 2543 wake_up_all(&cfg->reset_waitq); 2544 scsi_unblock_requests(cfg->host); 2545 } 2546 2547 static const struct pci_error_handlers cxlflash_err_handler = { 2548 .error_detected = cxlflash_pci_error_detected, 2549 .slot_reset = cxlflash_pci_slot_reset, 2550 .resume = cxlflash_pci_resume, 2551 }; 2552 2553 /* 2554 * PCI device structure 2555 */ 2556 static struct pci_driver cxlflash_driver = { 2557 .name = CXLFLASH_NAME, 2558 .id_table = cxlflash_pci_table, 2559 .probe = cxlflash_probe, 2560 .remove = cxlflash_remove, 2561 .err_handler = &cxlflash_err_handler, 2562 }; 2563 2564 /** 2565 * init_cxlflash() - module entry point 2566 * 2567 * Return: 0 on success, -errno on failure 2568 */ 2569 static int __init init_cxlflash(void) 2570 { 2571 pr_info("%s: %s\n", __func__, CXLFLASH_ADAPTER_NAME); 2572 2573 cxlflash_list_init(); 2574 2575 return pci_register_driver(&cxlflash_driver); 2576 } 2577 2578 /** 2579 * exit_cxlflash() - module exit point 2580 */ 2581 static void __exit exit_cxlflash(void) 2582 { 2583 cxlflash_term_global_luns(); 2584 cxlflash_free_errpage(); 2585 2586 pci_unregister_driver(&cxlflash_driver); 2587 } 2588 2589 module_init(init_cxlflash); 2590 module_exit(exit_cxlflash); 2591