Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 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 | |
| 27 | #include "main.h" |
| 28 | #include "sislite.h" |
| 29 | #include "common.h" |
| 30 | |
| 31 | MODULE_DESCRIPTION(CXLFLASH_ADAPTER_NAME); |
| 32 | MODULE_AUTHOR("Manoj N. Kumar <manoj@linux.vnet.ibm.com>"); |
| 33 | MODULE_AUTHOR("Matthew R. Ochs <mrochs@linux.vnet.ibm.com>"); |
| 34 | MODULE_LICENSE("GPL"); |
| 35 | |
| 36 | |
| 37 | /** |
| 38 | * cxlflash_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 | struct afu_cmd *cxlflash_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_debug("%s: returning found index=%d\n", |
| 61 | __func__, cmd->slot); |
| 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 | * cxlflash_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 | void cxlflash_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_debug("%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 | |
| 110 | if (unlikely(!cmd)) |
| 111 | return; |
| 112 | |
| 113 | ioarcb = &(cmd->rcb); |
| 114 | ioasa = &(cmd->sa); |
| 115 | |
| 116 | if (ioasa->rc.flags & SISL_RC_FLAGS_UNDERRUN) { |
| 117 | pr_debug("%s: cmd underrun cmd = %p scp = %p\n", |
| 118 | __func__, cmd, scp); |
| 119 | scp->result = (DID_ERROR << 16); |
| 120 | } |
| 121 | |
| 122 | if (ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN) { |
| 123 | pr_debug("%s: cmd underrun cmd = %p scp = %p\n", |
| 124 | __func__, cmd, scp); |
| 125 | scp->result = (DID_ERROR << 16); |
| 126 | } |
| 127 | |
| 128 | pr_debug("%s: cmd failed afu_rc=%d scsi_rc=%d fc_rc=%d " |
| 129 | "afu_extra=0x%X, scsi_entra=0x%X, fc_extra=0x%X\n", |
| 130 | __func__, ioasa->rc.afu_rc, ioasa->rc.scsi_rc, |
| 131 | ioasa->rc.fc_rc, ioasa->afu_extra, ioasa->scsi_extra, |
| 132 | ioasa->fc_extra); |
| 133 | |
| 134 | if (ioasa->rc.scsi_rc) { |
| 135 | /* We have a SCSI status */ |
| 136 | if (ioasa->rc.flags & SISL_RC_FLAGS_SENSE_VALID) { |
| 137 | memcpy(scp->sense_buffer, ioasa->sense_data, |
| 138 | SISL_SENSE_DATA_LEN); |
| 139 | scp->result = ioasa->rc.scsi_rc; |
| 140 | } else |
| 141 | scp->result = ioasa->rc.scsi_rc | (DID_ERROR << 16); |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * We encountered an error. Set scp->result based on nature |
| 146 | * of error. |
| 147 | */ |
| 148 | if (ioasa->rc.fc_rc) { |
| 149 | /* We have an FC status */ |
| 150 | switch (ioasa->rc.fc_rc) { |
| 151 | case SISL_FC_RC_LINKDOWN: |
| 152 | scp->result = (DID_REQUEUE << 16); |
| 153 | break; |
| 154 | case SISL_FC_RC_RESID: |
| 155 | /* This indicates an FCP resid underrun */ |
| 156 | if (!(ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN)) { |
| 157 | /* If the SISL_RC_FLAGS_OVERRUN flag was set, |
| 158 | * then we will handle this error else where. |
| 159 | * If not then we must handle it here. |
| 160 | * This is probably an AFU bug. We will |
| 161 | * attempt a retry to see if that resolves it. |
| 162 | */ |
| 163 | scp->result = (DID_ERROR << 16); |
| 164 | } |
| 165 | break; |
| 166 | case SISL_FC_RC_RESIDERR: |
| 167 | /* Resid mismatch between adapter and device */ |
| 168 | case SISL_FC_RC_TGTABORT: |
| 169 | case SISL_FC_RC_ABORTOK: |
| 170 | case SISL_FC_RC_ABORTFAIL: |
| 171 | case SISL_FC_RC_NOLOGI: |
| 172 | case SISL_FC_RC_ABORTPEND: |
| 173 | case SISL_FC_RC_WRABORTPEND: |
| 174 | case SISL_FC_RC_NOEXP: |
| 175 | case SISL_FC_RC_INUSE: |
| 176 | scp->result = (DID_ERROR << 16); |
| 177 | break; |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | if (ioasa->rc.afu_rc) { |
| 182 | /* We have an AFU error */ |
| 183 | switch (ioasa->rc.afu_rc) { |
| 184 | case SISL_AFU_RC_NO_CHANNELS: |
| 185 | scp->result = (DID_MEDIUM_ERROR << 16); |
| 186 | break; |
| 187 | case SISL_AFU_RC_DATA_DMA_ERR: |
| 188 | switch (ioasa->afu_extra) { |
| 189 | case SISL_AFU_DMA_ERR_PAGE_IN: |
| 190 | /* Retry */ |
| 191 | scp->result = (DID_IMM_RETRY << 16); |
| 192 | break; |
| 193 | case SISL_AFU_DMA_ERR_INVALID_EA: |
| 194 | default: |
| 195 | scp->result = (DID_ERROR << 16); |
| 196 | } |
| 197 | break; |
| 198 | case SISL_AFU_RC_OUT_OF_DATA_BUFS: |
| 199 | /* Retry */ |
| 200 | scp->result = (DID_ALLOC_FAILURE << 16); |
| 201 | break; |
| 202 | default: |
| 203 | scp->result = (DID_ERROR << 16); |
| 204 | } |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | /** |
| 209 | * cmd_complete() - command completion handler |
| 210 | * @cmd: AFU command that has completed. |
| 211 | * |
| 212 | * Prepares and submits command that has either completed or timed out to |
| 213 | * the SCSI stack. Checks AFU command back into command pool for non-internal |
| 214 | * (rcb.scp populated) commands. |
| 215 | */ |
| 216 | static void cmd_complete(struct afu_cmd *cmd) |
| 217 | { |
| 218 | struct scsi_cmnd *scp; |
| 219 | u32 resid; |
| 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.rc.afu_rc || |
| 232 | cmd->sa.rc.scsi_rc || |
| 233 | cmd->sa.rc.fc_rc)) |
| 234 | process_cmd_err(cmd, scp); |
| 235 | else |
| 236 | scp->result = (DID_OK << 16); |
| 237 | |
| 238 | resid = cmd->sa.resid; |
| 239 | cmd_is_tmf = cmd->cmd_tmf; |
| 240 | cxlflash_cmd_checkin(cmd); /* Don't use cmd after here */ |
| 241 | |
| 242 | pr_debug("%s: calling scsi_set_resid, scp=%p " |
| 243 | "result=%X resid=%d\n", __func__, |
| 244 | scp, scp->result, resid); |
| 245 | |
| 246 | scsi_set_resid(scp, resid); |
| 247 | scsi_dma_unmap(scp); |
| 248 | scp->scsi_done(scp); |
| 249 | |
| 250 | if (cmd_is_tmf) { |
| 251 | spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags); |
| 252 | cfg->tmf_active = false; |
| 253 | wake_up_all_locked(&cfg->tmf_waitq); |
| 254 | spin_unlock_irqrestore(&cfg->tmf_waitq.lock, |
| 255 | lock_flags); |
| 256 | } |
| 257 | } else |
| 258 | complete(&cmd->cevent); |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * send_tmf() - sends a Task Management Function (TMF) |
| 263 | * @afu: AFU to checkout from. |
| 264 | * @scp: SCSI command from stack. |
| 265 | * @tmfcmd: TMF command to send. |
| 266 | * |
| 267 | * Return: |
| 268 | * 0 on success |
| 269 | * SCSI_MLQUEUE_HOST_BUSY when host is busy |
| 270 | */ |
| 271 | static int send_tmf(struct afu *afu, struct scsi_cmnd *scp, u64 tmfcmd) |
| 272 | { |
| 273 | struct afu_cmd *cmd; |
| 274 | |
| 275 | u32 port_sel = scp->device->channel + 1; |
| 276 | short lflag = 0; |
| 277 | struct Scsi_Host *host = scp->device->host; |
| 278 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; |
| 279 | ulong lock_flags; |
| 280 | int rc = 0; |
| 281 | |
| 282 | cmd = cxlflash_cmd_checkout(afu); |
| 283 | if (unlikely(!cmd)) { |
| 284 | pr_err("%s: could not get a free command\n", __func__); |
| 285 | rc = SCSI_MLQUEUE_HOST_BUSY; |
| 286 | goto out; |
| 287 | } |
| 288 | |
| 289 | /* If a Task Management Function is active, do not send one more. |
| 290 | */ |
| 291 | spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags); |
| 292 | if (cfg->tmf_active) |
| 293 | wait_event_interruptible_locked_irq(cfg->tmf_waitq, |
| 294 | !cfg->tmf_active); |
| 295 | cfg->tmf_active = true; |
| 296 | cmd->cmd_tmf = true; |
| 297 | spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags); |
| 298 | |
| 299 | cmd->rcb.ctx_id = afu->ctx_hndl; |
| 300 | cmd->rcb.port_sel = port_sel; |
| 301 | cmd->rcb.lun_id = lun_to_lunid(scp->device->lun); |
| 302 | |
| 303 | lflag = SISL_REQ_FLAGS_TMF_CMD; |
| 304 | |
| 305 | cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID | |
| 306 | SISL_REQ_FLAGS_SUP_UNDERRUN | lflag); |
| 307 | |
| 308 | /* Stash the scp in the reserved field, for reuse during interrupt */ |
| 309 | cmd->rcb.scp = scp; |
| 310 | |
| 311 | /* Copy the CDB from the cmd passed in */ |
| 312 | memcpy(cmd->rcb.cdb, &tmfcmd, sizeof(tmfcmd)); |
| 313 | |
| 314 | /* Send the command */ |
| 315 | rc = cxlflash_send_cmd(afu, cmd); |
| 316 | if (unlikely(rc)) { |
| 317 | cxlflash_cmd_checkin(cmd); |
| 318 | spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags); |
| 319 | cfg->tmf_active = false; |
| 320 | spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags); |
| 321 | goto out; |
| 322 | } |
| 323 | |
| 324 | spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags); |
| 325 | wait_event_interruptible_locked_irq(cfg->tmf_waitq, !cfg->tmf_active); |
| 326 | spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags); |
| 327 | out: |
| 328 | return rc; |
| 329 | } |
| 330 | |
| 331 | /** |
| 332 | * cxlflash_driver_info() - information handler for this host driver |
| 333 | * @host: SCSI host associated with device. |
| 334 | * |
| 335 | * Return: A string describing the device. |
| 336 | */ |
| 337 | static const char *cxlflash_driver_info(struct Scsi_Host *host) |
| 338 | { |
| 339 | return CXLFLASH_ADAPTER_NAME; |
| 340 | } |
| 341 | |
| 342 | /** |
| 343 | * cxlflash_queuecommand() - sends a mid-layer request |
| 344 | * @host: SCSI host associated with device. |
| 345 | * @scp: SCSI command to send. |
| 346 | * |
| 347 | * Return: |
| 348 | * 0 on success |
| 349 | * SCSI_MLQUEUE_HOST_BUSY when host is busy |
| 350 | */ |
| 351 | static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp) |
| 352 | { |
| 353 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; |
| 354 | struct afu *afu = cfg->afu; |
| 355 | struct pci_dev *pdev = cfg->dev; |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 356 | struct device *dev = &cfg->dev->dev; |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 357 | struct afu_cmd *cmd; |
| 358 | u32 port_sel = scp->device->channel + 1; |
| 359 | int nseg, i, ncount; |
| 360 | struct scatterlist *sg; |
| 361 | ulong lock_flags; |
| 362 | short lflag = 0; |
| 363 | int rc = 0; |
| 364 | |
| 365 | pr_debug("%s: (scp=%p) %d/%d/%d/%llu cdb=(%08X-%08X-%08X-%08X)\n", |
| 366 | __func__, scp, host->host_no, scp->device->channel, |
| 367 | scp->device->id, scp->device->lun, |
| 368 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), |
| 369 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), |
| 370 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), |
| 371 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); |
| 372 | |
| 373 | /* If a Task Management Function is active, wait for it to complete |
| 374 | * before continuing with regular commands. |
| 375 | */ |
| 376 | spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags); |
| 377 | if (cfg->tmf_active) { |
| 378 | spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags); |
| 379 | rc = SCSI_MLQUEUE_HOST_BUSY; |
| 380 | goto out; |
| 381 | } |
| 382 | spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags); |
| 383 | |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 384 | switch (cfg->state) { |
| 385 | case STATE_LIMBO: |
| 386 | dev_dbg_ratelimited(dev, "%s: device in limbo!\n", __func__); |
| 387 | rc = SCSI_MLQUEUE_HOST_BUSY; |
| 388 | goto out; |
| 389 | case STATE_FAILTERM: |
| 390 | dev_dbg_ratelimited(dev, "%s: device has failed!\n", __func__); |
| 391 | scp->result = (DID_NO_CONNECT << 16); |
| 392 | scp->scsi_done(scp); |
| 393 | rc = 0; |
| 394 | goto out; |
| 395 | default: |
| 396 | break; |
| 397 | } |
| 398 | |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 399 | cmd = cxlflash_cmd_checkout(afu); |
| 400 | if (unlikely(!cmd)) { |
| 401 | pr_err("%s: could not get a free command\n", __func__); |
| 402 | rc = SCSI_MLQUEUE_HOST_BUSY; |
| 403 | goto out; |
| 404 | } |
| 405 | |
| 406 | cmd->rcb.ctx_id = afu->ctx_hndl; |
| 407 | cmd->rcb.port_sel = port_sel; |
| 408 | cmd->rcb.lun_id = lun_to_lunid(scp->device->lun); |
| 409 | |
| 410 | if (scp->sc_data_direction == DMA_TO_DEVICE) |
| 411 | lflag = SISL_REQ_FLAGS_HOST_WRITE; |
| 412 | else |
| 413 | lflag = SISL_REQ_FLAGS_HOST_READ; |
| 414 | |
| 415 | cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID | |
| 416 | SISL_REQ_FLAGS_SUP_UNDERRUN | lflag); |
| 417 | |
| 418 | /* Stash the scp in the reserved field, for reuse during interrupt */ |
| 419 | cmd->rcb.scp = scp; |
| 420 | |
| 421 | nseg = scsi_dma_map(scp); |
| 422 | if (unlikely(nseg < 0)) { |
| 423 | dev_err(&pdev->dev, "%s: Fail DMA map! nseg=%d\n", |
| 424 | __func__, nseg); |
| 425 | rc = SCSI_MLQUEUE_HOST_BUSY; |
| 426 | goto out; |
| 427 | } |
| 428 | |
| 429 | ncount = scsi_sg_count(scp); |
| 430 | scsi_for_each_sg(scp, sg, ncount, i) { |
| 431 | cmd->rcb.data_len = sg_dma_len(sg); |
| 432 | cmd->rcb.data_ea = sg_dma_address(sg); |
| 433 | } |
| 434 | |
| 435 | /* Copy the CDB from the scsi_cmnd passed in */ |
| 436 | memcpy(cmd->rcb.cdb, scp->cmnd, sizeof(cmd->rcb.cdb)); |
| 437 | |
| 438 | /* Send the command */ |
| 439 | rc = cxlflash_send_cmd(afu, cmd); |
| 440 | if (unlikely(rc)) { |
| 441 | cxlflash_cmd_checkin(cmd); |
| 442 | scsi_dma_unmap(scp); |
| 443 | } |
| 444 | |
| 445 | out: |
| 446 | return rc; |
| 447 | } |
| 448 | |
| 449 | /** |
| 450 | * cxlflash_eh_device_reset_handler() - reset a single LUN |
| 451 | * @scp: SCSI command to send. |
| 452 | * |
| 453 | * Return: |
| 454 | * SUCCESS as defined in scsi/scsi.h |
| 455 | * FAILED as defined in scsi/scsi.h |
| 456 | */ |
| 457 | static int cxlflash_eh_device_reset_handler(struct scsi_cmnd *scp) |
| 458 | { |
| 459 | int rc = SUCCESS; |
| 460 | struct Scsi_Host *host = scp->device->host; |
| 461 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; |
| 462 | struct afu *afu = cfg->afu; |
| 463 | int rcr = 0; |
| 464 | |
| 465 | pr_debug("%s: (scp=%p) %d/%d/%d/%llu " |
| 466 | "cdb=(%08X-%08X-%08X-%08X)\n", __func__, scp, |
| 467 | host->host_no, scp->device->channel, |
| 468 | scp->device->id, scp->device->lun, |
| 469 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), |
| 470 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), |
| 471 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), |
| 472 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); |
| 473 | |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 474 | switch (cfg->state) { |
| 475 | case STATE_NORMAL: |
| 476 | rcr = send_tmf(afu, scp, TMF_LUN_RESET); |
| 477 | if (unlikely(rcr)) |
| 478 | rc = FAILED; |
| 479 | break; |
| 480 | case STATE_LIMBO: |
| 481 | wait_event(cfg->limbo_waitq, cfg->state != STATE_LIMBO); |
| 482 | if (cfg->state == STATE_NORMAL) |
| 483 | break; |
| 484 | /* fall through */ |
| 485 | default: |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 486 | rc = FAILED; |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 487 | break; |
| 488 | } |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 489 | |
| 490 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
| 491 | return rc; |
| 492 | } |
| 493 | |
| 494 | /** |
| 495 | * cxlflash_eh_host_reset_handler() - reset the host adapter |
| 496 | * @scp: SCSI command from stack identifying host. |
| 497 | * |
| 498 | * Return: |
| 499 | * SUCCESS as defined in scsi/scsi.h |
| 500 | * FAILED as defined in scsi/scsi.h |
| 501 | */ |
| 502 | static int cxlflash_eh_host_reset_handler(struct scsi_cmnd *scp) |
| 503 | { |
| 504 | int rc = SUCCESS; |
| 505 | int rcr = 0; |
| 506 | struct Scsi_Host *host = scp->device->host; |
| 507 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; |
| 508 | |
| 509 | pr_debug("%s: (scp=%p) %d/%d/%d/%llu " |
| 510 | "cdb=(%08X-%08X-%08X-%08X)\n", __func__, scp, |
| 511 | host->host_no, scp->device->channel, |
| 512 | scp->device->id, scp->device->lun, |
| 513 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), |
| 514 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), |
| 515 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), |
| 516 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); |
| 517 | |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 518 | switch (cfg->state) { |
| 519 | case STATE_NORMAL: |
| 520 | cfg->state = STATE_LIMBO; |
| 521 | scsi_block_requests(cfg->host); |
| 522 | |
| 523 | rcr = cxlflash_afu_reset(cfg); |
| 524 | if (rcr) { |
| 525 | rc = FAILED; |
| 526 | cfg->state = STATE_FAILTERM; |
| 527 | } else |
| 528 | cfg->state = STATE_NORMAL; |
| 529 | wake_up_all(&cfg->limbo_waitq); |
| 530 | scsi_unblock_requests(cfg->host); |
| 531 | break; |
| 532 | case STATE_LIMBO: |
| 533 | wait_event(cfg->limbo_waitq, cfg->state != STATE_LIMBO); |
| 534 | if (cfg->state == STATE_NORMAL) |
| 535 | break; |
| 536 | /* fall through */ |
| 537 | default: |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 538 | rc = FAILED; |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 539 | break; |
| 540 | } |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 541 | |
| 542 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
| 543 | return rc; |
| 544 | } |
| 545 | |
| 546 | /** |
| 547 | * cxlflash_change_queue_depth() - change the queue depth for the device |
| 548 | * @sdev: SCSI device destined for queue depth change. |
| 549 | * @qdepth: Requested queue depth value to set. |
| 550 | * |
| 551 | * The requested queue depth is capped to the maximum supported value. |
| 552 | * |
| 553 | * Return: The actual queue depth set. |
| 554 | */ |
| 555 | static int cxlflash_change_queue_depth(struct scsi_device *sdev, int qdepth) |
| 556 | { |
| 557 | |
| 558 | if (qdepth > CXLFLASH_MAX_CMDS_PER_LUN) |
| 559 | qdepth = CXLFLASH_MAX_CMDS_PER_LUN; |
| 560 | |
| 561 | scsi_change_queue_depth(sdev, qdepth); |
| 562 | return sdev->queue_depth; |
| 563 | } |
| 564 | |
| 565 | /** |
| 566 | * cxlflash_show_port_status() - queries and presents the current port status |
| 567 | * @dev: Generic device associated with the host owning the port. |
| 568 | * @attr: Device attribute representing the port. |
| 569 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. |
| 570 | * |
| 571 | * Return: The size of the ASCII string returned in @buf. |
| 572 | */ |
| 573 | static ssize_t cxlflash_show_port_status(struct device *dev, |
| 574 | struct device_attribute *attr, |
| 575 | char *buf) |
| 576 | { |
| 577 | struct Scsi_Host *shost = class_to_shost(dev); |
| 578 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; |
| 579 | struct afu *afu = cfg->afu; |
| 580 | |
| 581 | char *disp_status; |
| 582 | int rc; |
| 583 | u32 port; |
| 584 | u64 status; |
| 585 | u64 *fc_regs; |
| 586 | |
| 587 | rc = kstrtouint((attr->attr.name + 4), 10, &port); |
| 588 | if (rc || (port > NUM_FC_PORTS)) |
| 589 | return 0; |
| 590 | |
| 591 | fc_regs = &afu->afu_map->global.fc_regs[port][0]; |
| 592 | status = |
| 593 | (readq_be(&fc_regs[FC_MTIP_STATUS / 8]) & FC_MTIP_STATUS_MASK); |
| 594 | |
| 595 | if (status == FC_MTIP_STATUS_ONLINE) |
| 596 | disp_status = "online"; |
| 597 | else if (status == FC_MTIP_STATUS_OFFLINE) |
| 598 | disp_status = "offline"; |
| 599 | else |
| 600 | disp_status = "unknown"; |
| 601 | |
| 602 | return snprintf(buf, PAGE_SIZE, "%s\n", disp_status); |
| 603 | } |
| 604 | |
| 605 | /** |
| 606 | * cxlflash_show_lun_mode() - presents the current LUN mode of the host |
| 607 | * @dev: Generic device associated with the host. |
| 608 | * @attr: Device attribute representing the lun mode. |
| 609 | * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII. |
| 610 | * |
| 611 | * Return: The size of the ASCII string returned in @buf. |
| 612 | */ |
| 613 | static ssize_t cxlflash_show_lun_mode(struct device *dev, |
| 614 | struct device_attribute *attr, char *buf) |
| 615 | { |
| 616 | struct Scsi_Host *shost = class_to_shost(dev); |
| 617 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; |
| 618 | struct afu *afu = cfg->afu; |
| 619 | |
| 620 | return snprintf(buf, PAGE_SIZE, "%u\n", afu->internal_lun); |
| 621 | } |
| 622 | |
| 623 | /** |
| 624 | * cxlflash_store_lun_mode() - sets the LUN mode of the host |
| 625 | * @dev: Generic device associated with the host. |
| 626 | * @attr: Device attribute representing the lun mode. |
| 627 | * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII. |
| 628 | * @count: Length of data resizing in @buf. |
| 629 | * |
| 630 | * The CXL Flash AFU supports a dummy LUN mode where the external |
| 631 | * links and storage are not required. Space on the FPGA is used |
| 632 | * to create 1 or 2 small LUNs which are presented to the system |
| 633 | * as if they were a normal storage device. This feature is useful |
| 634 | * during development and also provides manufacturing with a way |
| 635 | * to test the AFU without an actual device. |
| 636 | * |
| 637 | * 0 = external LUN[s] (default) |
| 638 | * 1 = internal LUN (1 x 64K, 512B blocks, id 0) |
| 639 | * 2 = internal LUN (1 x 64K, 4K blocks, id 0) |
| 640 | * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1) |
| 641 | * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1) |
| 642 | * |
| 643 | * Return: The size of the ASCII string returned in @buf. |
| 644 | */ |
| 645 | static ssize_t cxlflash_store_lun_mode(struct device *dev, |
| 646 | struct device_attribute *attr, |
| 647 | const char *buf, size_t count) |
| 648 | { |
| 649 | struct Scsi_Host *shost = class_to_shost(dev); |
| 650 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; |
| 651 | struct afu *afu = cfg->afu; |
| 652 | int rc; |
| 653 | u32 lun_mode; |
| 654 | |
| 655 | rc = kstrtouint(buf, 10, &lun_mode); |
| 656 | if (!rc && (lun_mode < 5) && (lun_mode != afu->internal_lun)) { |
| 657 | afu->internal_lun = lun_mode; |
| 658 | cxlflash_afu_reset(cfg); |
| 659 | scsi_scan_host(cfg->host); |
| 660 | } |
| 661 | |
| 662 | return count; |
| 663 | } |
| 664 | |
| 665 | /** |
| 666 | * cxlflash_show_dev_mode() - presents the current mode of the device |
| 667 | * @dev: Generic device associated with the device. |
| 668 | * @attr: Device attribute representing the device mode. |
| 669 | * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII. |
| 670 | * |
| 671 | * Return: The size of the ASCII string returned in @buf. |
| 672 | */ |
| 673 | static ssize_t cxlflash_show_dev_mode(struct device *dev, |
| 674 | struct device_attribute *attr, char *buf) |
| 675 | { |
| 676 | struct scsi_device *sdev = to_scsi_device(dev); |
| 677 | |
| 678 | return snprintf(buf, PAGE_SIZE, "%s\n", |
| 679 | sdev->hostdata ? "superpipe" : "legacy"); |
| 680 | } |
| 681 | |
| 682 | /** |
| 683 | * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe |
| 684 | * @cxlflash: Internal structure associated with the host. |
| 685 | */ |
| 686 | static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg *cfg) |
| 687 | { |
| 688 | struct pci_dev *pdev = cfg->dev; |
| 689 | |
| 690 | if (pci_channel_offline(pdev)) |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 691 | wait_event_timeout(cfg->limbo_waitq, |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 692 | !pci_channel_offline(pdev), |
| 693 | CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT); |
| 694 | } |
| 695 | |
| 696 | /* |
| 697 | * Host attributes |
| 698 | */ |
| 699 | static DEVICE_ATTR(port0, S_IRUGO, cxlflash_show_port_status, NULL); |
| 700 | static DEVICE_ATTR(port1, S_IRUGO, cxlflash_show_port_status, NULL); |
| 701 | static DEVICE_ATTR(lun_mode, S_IRUGO | S_IWUSR, cxlflash_show_lun_mode, |
| 702 | cxlflash_store_lun_mode); |
| 703 | |
| 704 | static struct device_attribute *cxlflash_host_attrs[] = { |
| 705 | &dev_attr_port0, |
| 706 | &dev_attr_port1, |
| 707 | &dev_attr_lun_mode, |
| 708 | NULL |
| 709 | }; |
| 710 | |
| 711 | /* |
| 712 | * Device attributes |
| 713 | */ |
| 714 | static DEVICE_ATTR(mode, S_IRUGO, cxlflash_show_dev_mode, NULL); |
| 715 | |
| 716 | static struct device_attribute *cxlflash_dev_attrs[] = { |
| 717 | &dev_attr_mode, |
| 718 | NULL |
| 719 | }; |
| 720 | |
| 721 | /* |
| 722 | * Host template |
| 723 | */ |
| 724 | static struct scsi_host_template driver_template = { |
| 725 | .module = THIS_MODULE, |
| 726 | .name = CXLFLASH_ADAPTER_NAME, |
| 727 | .info = cxlflash_driver_info, |
| 728 | .proc_name = CXLFLASH_NAME, |
| 729 | .queuecommand = cxlflash_queuecommand, |
| 730 | .eh_device_reset_handler = cxlflash_eh_device_reset_handler, |
| 731 | .eh_host_reset_handler = cxlflash_eh_host_reset_handler, |
| 732 | .change_queue_depth = cxlflash_change_queue_depth, |
| 733 | .cmd_per_lun = 16, |
| 734 | .can_queue = CXLFLASH_MAX_CMDS, |
| 735 | .this_id = -1, |
| 736 | .sg_tablesize = SG_NONE, /* No scatter gather support. */ |
| 737 | .max_sectors = CXLFLASH_MAX_SECTORS, |
| 738 | .use_clustering = ENABLE_CLUSTERING, |
| 739 | .shost_attrs = cxlflash_host_attrs, |
| 740 | .sdev_attrs = cxlflash_dev_attrs, |
| 741 | }; |
| 742 | |
| 743 | /* |
| 744 | * Device dependent values |
| 745 | */ |
| 746 | static struct dev_dependent_vals dev_corsa_vals = { CXLFLASH_MAX_SECTORS }; |
| 747 | |
| 748 | /* |
| 749 | * PCI device binding table |
| 750 | */ |
| 751 | static struct pci_device_id cxlflash_pci_table[] = { |
| 752 | {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CORSA, |
| 753 | PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_corsa_vals}, |
| 754 | {} |
| 755 | }; |
| 756 | |
| 757 | MODULE_DEVICE_TABLE(pci, cxlflash_pci_table); |
| 758 | |
| 759 | /** |
| 760 | * free_mem() - free memory associated with the AFU |
| 761 | * @cxlflash: Internal structure associated with the host. |
| 762 | */ |
| 763 | static void free_mem(struct cxlflash_cfg *cfg) |
| 764 | { |
| 765 | int i; |
| 766 | char *buf = NULL; |
| 767 | struct afu *afu = cfg->afu; |
| 768 | |
| 769 | if (cfg->afu) { |
| 770 | for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { |
| 771 | buf = afu->cmd[i].buf; |
| 772 | if (!((u64)buf & (PAGE_SIZE - 1))) |
| 773 | free_page((ulong)buf); |
| 774 | } |
| 775 | |
| 776 | free_pages((ulong)afu, get_order(sizeof(struct afu))); |
| 777 | cfg->afu = NULL; |
| 778 | } |
| 779 | } |
| 780 | |
| 781 | /** |
| 782 | * stop_afu() - stops the AFU command timers and unmaps the MMIO space |
| 783 | * @cxlflash: Internal structure associated with the host. |
| 784 | * |
| 785 | * Safe to call with AFU in a partially allocated/initialized state. |
| 786 | */ |
| 787 | static void stop_afu(struct cxlflash_cfg *cfg) |
| 788 | { |
| 789 | int i; |
| 790 | struct afu *afu = cfg->afu; |
| 791 | |
| 792 | if (likely(afu)) { |
| 793 | for (i = 0; i < CXLFLASH_NUM_CMDS; i++) |
| 794 | complete(&afu->cmd[i].cevent); |
| 795 | |
| 796 | if (likely(afu->afu_map)) { |
| 797 | cxl_psa_unmap((void *)afu->afu_map); |
| 798 | afu->afu_map = NULL; |
| 799 | } |
| 800 | } |
| 801 | } |
| 802 | |
| 803 | /** |
| 804 | * term_mc() - terminates the master context |
| 805 | * @cxlflash: Internal structure associated with the host. |
| 806 | * @level: Depth of allocation, where to begin waterfall tear down. |
| 807 | * |
| 808 | * Safe to call with AFU/MC in partially allocated/initialized state. |
| 809 | */ |
| 810 | static void term_mc(struct cxlflash_cfg *cfg, enum undo_level level) |
| 811 | { |
| 812 | int rc = 0; |
| 813 | struct afu *afu = cfg->afu; |
| 814 | |
| 815 | if (!afu || !cfg->mcctx) { |
| 816 | pr_err("%s: returning from term_mc with NULL afu or MC\n", |
| 817 | __func__); |
| 818 | return; |
| 819 | } |
| 820 | |
| 821 | switch (level) { |
| 822 | case UNDO_START: |
| 823 | rc = cxl_stop_context(cfg->mcctx); |
| 824 | BUG_ON(rc); |
| 825 | case UNMAP_THREE: |
| 826 | cxl_unmap_afu_irq(cfg->mcctx, 3, afu); |
| 827 | case UNMAP_TWO: |
| 828 | cxl_unmap_afu_irq(cfg->mcctx, 2, afu); |
| 829 | case UNMAP_ONE: |
| 830 | cxl_unmap_afu_irq(cfg->mcctx, 1, afu); |
| 831 | case FREE_IRQ: |
| 832 | cxl_free_afu_irqs(cfg->mcctx); |
| 833 | case RELEASE_CONTEXT: |
| 834 | cfg->mcctx = NULL; |
| 835 | } |
| 836 | } |
| 837 | |
| 838 | /** |
| 839 | * term_afu() - terminates the AFU |
| 840 | * @cxlflash: Internal structure associated with the host. |
| 841 | * |
| 842 | * Safe to call with AFU/MC in partially allocated/initialized state. |
| 843 | */ |
| 844 | static void term_afu(struct cxlflash_cfg *cfg) |
| 845 | { |
| 846 | term_mc(cfg, UNDO_START); |
| 847 | |
| 848 | if (cfg->afu) |
| 849 | stop_afu(cfg); |
| 850 | |
| 851 | pr_debug("%s: returning\n", __func__); |
| 852 | } |
| 853 | |
| 854 | /** |
| 855 | * cxlflash_remove() - PCI entry point to tear down host |
| 856 | * @pdev: PCI device associated with the host. |
| 857 | * |
| 858 | * Safe to use as a cleanup in partially allocated/initialized state. |
| 859 | */ |
| 860 | static void cxlflash_remove(struct pci_dev *pdev) |
| 861 | { |
| 862 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); |
| 863 | ulong lock_flags; |
| 864 | |
| 865 | /* If a Task Management Function is active, wait for it to complete |
| 866 | * before continuing with remove. |
| 867 | */ |
| 868 | spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags); |
| 869 | if (cfg->tmf_active) |
| 870 | wait_event_interruptible_locked_irq(cfg->tmf_waitq, |
| 871 | !cfg->tmf_active); |
| 872 | spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags); |
| 873 | |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 874 | cfg->state = STATE_FAILTERM; |
| 875 | |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 876 | switch (cfg->init_state) { |
| 877 | case INIT_STATE_SCSI: |
| 878 | scsi_remove_host(cfg->host); |
| 879 | scsi_host_put(cfg->host); |
| 880 | /* Fall through */ |
| 881 | case INIT_STATE_AFU: |
| 882 | term_afu(cfg); |
| 883 | case INIT_STATE_PCI: |
| 884 | pci_release_regions(cfg->dev); |
| 885 | pci_disable_device(pdev); |
| 886 | case INIT_STATE_NONE: |
| 887 | flush_work(&cfg->work_q); |
| 888 | free_mem(cfg); |
| 889 | break; |
| 890 | } |
| 891 | |
| 892 | pr_debug("%s: returning\n", __func__); |
| 893 | } |
| 894 | |
| 895 | /** |
| 896 | * alloc_mem() - allocates the AFU and its command pool |
| 897 | * @cxlflash: Internal structure associated with the host. |
| 898 | * |
| 899 | * A partially allocated state remains on failure. |
| 900 | * |
| 901 | * Return: |
| 902 | * 0 on success |
| 903 | * -ENOMEM on failure to allocate memory |
| 904 | */ |
| 905 | static int alloc_mem(struct cxlflash_cfg *cfg) |
| 906 | { |
| 907 | int rc = 0; |
| 908 | int i; |
| 909 | char *buf = NULL; |
| 910 | |
| 911 | /* This allocation is about 12K, i.e. only 1 64k page |
| 912 | * and upto 4 4k pages |
| 913 | */ |
| 914 | cfg->afu = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, |
| 915 | get_order(sizeof(struct afu))); |
| 916 | if (unlikely(!cfg->afu)) { |
| 917 | pr_err("%s: cannot get %d free pages\n", |
| 918 | __func__, get_order(sizeof(struct afu))); |
| 919 | rc = -ENOMEM; |
| 920 | goto out; |
| 921 | } |
| 922 | cfg->afu->parent = cfg; |
| 923 | cfg->afu->afu_map = NULL; |
| 924 | |
| 925 | for (i = 0; i < CXLFLASH_NUM_CMDS; buf += CMD_BUFSIZE, i++) { |
| 926 | if (!((u64)buf & (PAGE_SIZE - 1))) { |
| 927 | buf = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO); |
| 928 | if (unlikely(!buf)) { |
| 929 | pr_err("%s: Allocate command buffers fail!\n", |
| 930 | __func__); |
| 931 | rc = -ENOMEM; |
| 932 | free_mem(cfg); |
| 933 | goto out; |
| 934 | } |
| 935 | } |
| 936 | |
| 937 | cfg->afu->cmd[i].buf = buf; |
| 938 | atomic_set(&cfg->afu->cmd[i].free, 1); |
| 939 | cfg->afu->cmd[i].slot = i; |
| 940 | } |
| 941 | |
| 942 | out: |
| 943 | return rc; |
| 944 | } |
| 945 | |
| 946 | /** |
| 947 | * init_pci() - initializes the host as a PCI device |
| 948 | * @cxlflash: Internal structure associated with the host. |
| 949 | * |
| 950 | * Return: |
| 951 | * 0 on success |
| 952 | * -EIO on unable to communicate with device |
| 953 | * A return code from the PCI sub-routines |
| 954 | */ |
| 955 | static int init_pci(struct cxlflash_cfg *cfg) |
| 956 | { |
| 957 | struct pci_dev *pdev = cfg->dev; |
| 958 | int rc = 0; |
| 959 | |
| 960 | cfg->cxlflash_regs_pci = pci_resource_start(pdev, 0); |
| 961 | rc = pci_request_regions(pdev, CXLFLASH_NAME); |
| 962 | if (rc < 0) { |
| 963 | dev_err(&pdev->dev, |
| 964 | "%s: Couldn't register memory range of registers\n", |
| 965 | __func__); |
| 966 | goto out; |
| 967 | } |
| 968 | |
| 969 | rc = pci_enable_device(pdev); |
| 970 | if (rc || pci_channel_offline(pdev)) { |
| 971 | if (pci_channel_offline(pdev)) { |
| 972 | cxlflash_wait_for_pci_err_recovery(cfg); |
| 973 | rc = pci_enable_device(pdev); |
| 974 | } |
| 975 | |
| 976 | if (rc) { |
| 977 | dev_err(&pdev->dev, "%s: Cannot enable adapter\n", |
| 978 | __func__); |
| 979 | cxlflash_wait_for_pci_err_recovery(cfg); |
| 980 | goto out_release_regions; |
| 981 | } |
| 982 | } |
| 983 | |
| 984 | rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); |
| 985 | if (rc < 0) { |
| 986 | dev_dbg(&pdev->dev, "%s: Failed to set 64 bit PCI DMA mask\n", |
| 987 | __func__); |
| 988 | rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); |
| 989 | } |
| 990 | |
| 991 | if (rc < 0) { |
| 992 | dev_err(&pdev->dev, "%s: Failed to set PCI DMA mask\n", |
| 993 | __func__); |
| 994 | goto out_disable; |
| 995 | } |
| 996 | |
| 997 | pci_set_master(pdev); |
| 998 | |
| 999 | if (pci_channel_offline(pdev)) { |
| 1000 | cxlflash_wait_for_pci_err_recovery(cfg); |
| 1001 | if (pci_channel_offline(pdev)) { |
| 1002 | rc = -EIO; |
| 1003 | goto out_msi_disable; |
| 1004 | } |
| 1005 | } |
| 1006 | |
| 1007 | rc = pci_save_state(pdev); |
| 1008 | |
| 1009 | if (rc != PCIBIOS_SUCCESSFUL) { |
| 1010 | dev_err(&pdev->dev, "%s: Failed to save PCI config space\n", |
| 1011 | __func__); |
| 1012 | rc = -EIO; |
| 1013 | goto cleanup_nolog; |
| 1014 | } |
| 1015 | |
| 1016 | out: |
| 1017 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
| 1018 | return rc; |
| 1019 | |
| 1020 | cleanup_nolog: |
| 1021 | out_msi_disable: |
| 1022 | cxlflash_wait_for_pci_err_recovery(cfg); |
| 1023 | out_disable: |
| 1024 | pci_disable_device(pdev); |
| 1025 | out_release_regions: |
| 1026 | pci_release_regions(pdev); |
| 1027 | goto out; |
| 1028 | |
| 1029 | } |
| 1030 | |
| 1031 | /** |
| 1032 | * init_scsi() - adds the host to the SCSI stack and kicks off host scan |
| 1033 | * @cxlflash: Internal structure associated with the host. |
| 1034 | * |
| 1035 | * Return: |
| 1036 | * 0 on success |
| 1037 | * A return code from adding the host |
| 1038 | */ |
| 1039 | static int init_scsi(struct cxlflash_cfg *cfg) |
| 1040 | { |
| 1041 | struct pci_dev *pdev = cfg->dev; |
| 1042 | int rc = 0; |
| 1043 | |
| 1044 | rc = scsi_add_host(cfg->host, &pdev->dev); |
| 1045 | if (rc) { |
| 1046 | dev_err(&pdev->dev, "%s: scsi_add_host failed (rc=%d)\n", |
| 1047 | __func__, rc); |
| 1048 | goto out; |
| 1049 | } |
| 1050 | |
| 1051 | scsi_scan_host(cfg->host); |
| 1052 | |
| 1053 | out: |
| 1054 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
| 1055 | return rc; |
| 1056 | } |
| 1057 | |
| 1058 | /** |
| 1059 | * set_port_online() - transitions the specified host FC port to online state |
| 1060 | * @fc_regs: Top of MMIO region defined for specified port. |
| 1061 | * |
| 1062 | * The provided MMIO region must be mapped prior to call. Online state means |
| 1063 | * that the FC link layer has synced, completed the handshaking process, and |
| 1064 | * is ready for login to start. |
| 1065 | */ |
| 1066 | static void set_port_online(u64 *fc_regs) |
| 1067 | { |
| 1068 | u64 cmdcfg; |
| 1069 | |
| 1070 | cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); |
| 1071 | cmdcfg &= (~FC_MTIP_CMDCONFIG_OFFLINE); /* clear OFF_LINE */ |
| 1072 | cmdcfg |= (FC_MTIP_CMDCONFIG_ONLINE); /* set ON_LINE */ |
| 1073 | writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); |
| 1074 | } |
| 1075 | |
| 1076 | /** |
| 1077 | * set_port_offline() - transitions the specified host FC port to offline state |
| 1078 | * @fc_regs: Top of MMIO region defined for specified port. |
| 1079 | * |
| 1080 | * The provided MMIO region must be mapped prior to call. |
| 1081 | */ |
| 1082 | static void set_port_offline(u64 *fc_regs) |
| 1083 | { |
| 1084 | u64 cmdcfg; |
| 1085 | |
| 1086 | cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); |
| 1087 | cmdcfg &= (~FC_MTIP_CMDCONFIG_ONLINE); /* clear ON_LINE */ |
| 1088 | cmdcfg |= (FC_MTIP_CMDCONFIG_OFFLINE); /* set OFF_LINE */ |
| 1089 | writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); |
| 1090 | } |
| 1091 | |
| 1092 | /** |
| 1093 | * wait_port_online() - waits for the specified host FC port come online |
| 1094 | * @fc_regs: Top of MMIO region defined for specified port. |
| 1095 | * @delay_us: Number of microseconds to delay between reading port status. |
| 1096 | * @nretry: Number of cycles to retry reading port status. |
| 1097 | * |
| 1098 | * The provided MMIO region must be mapped prior to call. This will timeout |
| 1099 | * when the cable is not plugged in. |
| 1100 | * |
| 1101 | * Return: |
| 1102 | * TRUE (1) when the specified port is online |
| 1103 | * FALSE (0) when the specified port fails to come online after timeout |
| 1104 | * -EINVAL when @delay_us is less than 1000 |
| 1105 | */ |
| 1106 | static int wait_port_online(u64 *fc_regs, u32 delay_us, u32 nretry) |
| 1107 | { |
| 1108 | u64 status; |
| 1109 | |
| 1110 | if (delay_us < 1000) { |
| 1111 | pr_err("%s: invalid delay specified %d\n", __func__, delay_us); |
| 1112 | return -EINVAL; |
| 1113 | } |
| 1114 | |
| 1115 | do { |
| 1116 | msleep(delay_us / 1000); |
| 1117 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); |
| 1118 | } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_ONLINE && |
| 1119 | nretry--); |
| 1120 | |
| 1121 | return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_ONLINE); |
| 1122 | } |
| 1123 | |
| 1124 | /** |
| 1125 | * wait_port_offline() - waits for the specified host FC port go offline |
| 1126 | * @fc_regs: Top of MMIO region defined for specified port. |
| 1127 | * @delay_us: Number of microseconds to delay between reading port status. |
| 1128 | * @nretry: Number of cycles to retry reading port status. |
| 1129 | * |
| 1130 | * The provided MMIO region must be mapped prior to call. |
| 1131 | * |
| 1132 | * Return: |
| 1133 | * TRUE (1) when the specified port is offline |
| 1134 | * FALSE (0) when the specified port fails to go offline after timeout |
| 1135 | * -EINVAL when @delay_us is less than 1000 |
| 1136 | */ |
| 1137 | static int wait_port_offline(u64 *fc_regs, u32 delay_us, u32 nretry) |
| 1138 | { |
| 1139 | u64 status; |
| 1140 | |
| 1141 | if (delay_us < 1000) { |
| 1142 | pr_err("%s: invalid delay specified %d\n", __func__, delay_us); |
| 1143 | return -EINVAL; |
| 1144 | } |
| 1145 | |
| 1146 | do { |
| 1147 | msleep(delay_us / 1000); |
| 1148 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); |
| 1149 | } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_OFFLINE && |
| 1150 | nretry--); |
| 1151 | |
| 1152 | return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_OFFLINE); |
| 1153 | } |
| 1154 | |
| 1155 | /** |
| 1156 | * afu_set_wwpn() - configures the WWPN for the specified host FC port |
| 1157 | * @afu: AFU associated with the host that owns the specified FC port. |
| 1158 | * @port: Port number being configured. |
| 1159 | * @fc_regs: Top of MMIO region defined for specified port. |
| 1160 | * @wwpn: The world-wide-port-number previously discovered for port. |
| 1161 | * |
| 1162 | * The provided MMIO region must be mapped prior to call. As part of the |
| 1163 | * sequence to configure the WWPN, the port is toggled offline and then back |
| 1164 | * online. This toggling action can cause this routine to delay up to a few |
| 1165 | * seconds. When configured to use the internal LUN feature of the AFU, a |
| 1166 | * failure to come online is overridden. |
| 1167 | * |
| 1168 | * Return: |
| 1169 | * 0 when the WWPN is successfully written and the port comes back online |
| 1170 | * -1 when the port fails to go offline or come back up online |
| 1171 | */ |
| 1172 | static int afu_set_wwpn(struct afu *afu, int port, u64 *fc_regs, u64 wwpn) |
| 1173 | { |
| 1174 | int ret = 0; |
| 1175 | |
| 1176 | set_port_offline(fc_regs); |
| 1177 | |
| 1178 | if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, |
| 1179 | FC_PORT_STATUS_RETRY_CNT)) { |
| 1180 | pr_debug("%s: wait on port %d to go offline timed out\n", |
| 1181 | __func__, port); |
| 1182 | ret = -1; /* but continue on to leave the port back online */ |
| 1183 | } |
| 1184 | |
| 1185 | if (ret == 0) |
| 1186 | writeq_be(wwpn, &fc_regs[FC_PNAME / 8]); |
| 1187 | |
| 1188 | set_port_online(fc_regs); |
| 1189 | |
| 1190 | if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, |
| 1191 | FC_PORT_STATUS_RETRY_CNT)) { |
| 1192 | pr_debug("%s: wait on port %d to go online timed out\n", |
| 1193 | __func__, port); |
| 1194 | ret = -1; |
| 1195 | |
| 1196 | /* |
| 1197 | * Override for internal lun!!! |
| 1198 | */ |
| 1199 | if (afu->internal_lun) { |
| 1200 | pr_debug("%s: Overriding port %d online timeout!!!\n", |
| 1201 | __func__, port); |
| 1202 | ret = 0; |
| 1203 | } |
| 1204 | } |
| 1205 | |
| 1206 | pr_debug("%s: returning rc=%d\n", __func__, ret); |
| 1207 | |
| 1208 | return ret; |
| 1209 | } |
| 1210 | |
| 1211 | /** |
| 1212 | * afu_link_reset() - resets the specified host FC port |
| 1213 | * @afu: AFU associated with the host that owns the specified FC port. |
| 1214 | * @port: Port number being configured. |
| 1215 | * @fc_regs: Top of MMIO region defined for specified port. |
| 1216 | * |
| 1217 | * The provided MMIO region must be mapped prior to call. The sequence to |
| 1218 | * reset the port involves toggling it offline and then back online. This |
| 1219 | * action can cause this routine to delay up to a few seconds. An effort |
| 1220 | * is made to maintain link with the device by switching to host to use |
| 1221 | * the alternate port exclusively while the reset takes place. |
| 1222 | * failure to come online is overridden. |
| 1223 | */ |
| 1224 | static void afu_link_reset(struct afu *afu, int port, u64 *fc_regs) |
| 1225 | { |
| 1226 | u64 port_sel; |
| 1227 | |
| 1228 | /* first switch the AFU to the other links, if any */ |
| 1229 | port_sel = readq_be(&afu->afu_map->global.regs.afu_port_sel); |
| 1230 | port_sel &= ~(1 << port); |
| 1231 | writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); |
| 1232 | cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); |
| 1233 | |
| 1234 | set_port_offline(fc_regs); |
| 1235 | if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, |
| 1236 | FC_PORT_STATUS_RETRY_CNT)) |
| 1237 | pr_err("%s: wait on port %d to go offline timed out\n", |
| 1238 | __func__, port); |
| 1239 | |
| 1240 | set_port_online(fc_regs); |
| 1241 | if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, |
| 1242 | FC_PORT_STATUS_RETRY_CNT)) |
| 1243 | pr_err("%s: wait on port %d to go online timed out\n", |
| 1244 | __func__, port); |
| 1245 | |
| 1246 | /* switch back to include this port */ |
| 1247 | port_sel |= (1 << port); |
| 1248 | writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); |
| 1249 | cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); |
| 1250 | |
| 1251 | pr_debug("%s: returning port_sel=%lld\n", __func__, port_sel); |
| 1252 | } |
| 1253 | |
| 1254 | /* |
| 1255 | * Asynchronous interrupt information table |
| 1256 | */ |
| 1257 | static const struct asyc_intr_info ainfo[] = { |
| 1258 | {SISL_ASTATUS_FC0_OTHER, "other error", 0, CLR_FC_ERROR | LINK_RESET}, |
| 1259 | {SISL_ASTATUS_FC0_LOGO, "target initiated LOGO", 0, 0}, |
| 1260 | {SISL_ASTATUS_FC0_CRC_T, "CRC threshold exceeded", 0, LINK_RESET}, |
| 1261 | {SISL_ASTATUS_FC0_LOGI_R, "login timed out, retrying", 0, 0}, |
| 1262 | {SISL_ASTATUS_FC0_LOGI_F, "login failed", 0, CLR_FC_ERROR}, |
| 1263 | {SISL_ASTATUS_FC0_LOGI_S, "login succeeded", 0, 0}, |
| 1264 | {SISL_ASTATUS_FC0_LINK_DN, "link down", 0, 0}, |
| 1265 | {SISL_ASTATUS_FC0_LINK_UP, "link up", 0, 0}, |
| 1266 | {SISL_ASTATUS_FC1_OTHER, "other error", 1, CLR_FC_ERROR | LINK_RESET}, |
| 1267 | {SISL_ASTATUS_FC1_LOGO, "target initiated LOGO", 1, 0}, |
| 1268 | {SISL_ASTATUS_FC1_CRC_T, "CRC threshold exceeded", 1, LINK_RESET}, |
| 1269 | {SISL_ASTATUS_FC1_LOGI_R, "login timed out, retrying", 1, 0}, |
| 1270 | {SISL_ASTATUS_FC1_LOGI_F, "login failed", 1, CLR_FC_ERROR}, |
| 1271 | {SISL_ASTATUS_FC1_LOGI_S, "login succeeded", 1, 0}, |
| 1272 | {SISL_ASTATUS_FC1_LINK_DN, "link down", 1, 0}, |
| 1273 | {SISL_ASTATUS_FC1_LINK_UP, "link up", 1, 0}, |
| 1274 | {0x0, "", 0, 0} /* terminator */ |
| 1275 | }; |
| 1276 | |
| 1277 | /** |
| 1278 | * find_ainfo() - locates and returns asynchronous interrupt information |
| 1279 | * @status: Status code set by AFU on error. |
| 1280 | * |
| 1281 | * Return: The located information or NULL when the status code is invalid. |
| 1282 | */ |
| 1283 | static const struct asyc_intr_info *find_ainfo(u64 status) |
| 1284 | { |
| 1285 | const struct asyc_intr_info *info; |
| 1286 | |
| 1287 | for (info = &ainfo[0]; info->status; info++) |
| 1288 | if (info->status == status) |
| 1289 | return info; |
| 1290 | |
| 1291 | return NULL; |
| 1292 | } |
| 1293 | |
| 1294 | /** |
| 1295 | * afu_err_intr_init() - clears and initializes the AFU for error interrupts |
| 1296 | * @afu: AFU associated with the host. |
| 1297 | */ |
| 1298 | static void afu_err_intr_init(struct afu *afu) |
| 1299 | { |
| 1300 | int i; |
| 1301 | u64 reg; |
| 1302 | |
| 1303 | /* global async interrupts: AFU clears afu_ctrl on context exit |
| 1304 | * if async interrupts were sent to that context. This prevents |
| 1305 | * the AFU form sending further async interrupts when |
| 1306 | * there is |
| 1307 | * nobody to receive them. |
| 1308 | */ |
| 1309 | |
| 1310 | /* mask all */ |
| 1311 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_mask); |
| 1312 | /* set LISN# to send and point to master context */ |
| 1313 | reg = ((u64) (((afu->ctx_hndl << 8) | SISL_MSI_ASYNC_ERROR)) << 40); |
| 1314 | |
| 1315 | if (afu->internal_lun) |
| 1316 | reg |= 1; /* Bit 63 indicates local lun */ |
| 1317 | writeq_be(reg, &afu->afu_map->global.regs.afu_ctrl); |
| 1318 | /* clear all */ |
| 1319 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); |
| 1320 | /* unmask bits that are of interest */ |
| 1321 | /* note: afu can send an interrupt after this step */ |
| 1322 | writeq_be(SISL_ASTATUS_MASK, &afu->afu_map->global.regs.aintr_mask); |
| 1323 | /* clear again in case a bit came on after previous clear but before */ |
| 1324 | /* unmask */ |
| 1325 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); |
| 1326 | |
| 1327 | /* Clear/Set internal lun bits */ |
| 1328 | reg = readq_be(&afu->afu_map->global.fc_regs[0][FC_CONFIG2 / 8]); |
| 1329 | reg &= SISL_FC_INTERNAL_MASK; |
| 1330 | if (afu->internal_lun) |
| 1331 | reg |= ((u64)(afu->internal_lun - 1) << SISL_FC_INTERNAL_SHIFT); |
| 1332 | writeq_be(reg, &afu->afu_map->global.fc_regs[0][FC_CONFIG2 / 8]); |
| 1333 | |
| 1334 | /* now clear FC errors */ |
| 1335 | for (i = 0; i < NUM_FC_PORTS; i++) { |
| 1336 | writeq_be(0xFFFFFFFFU, |
| 1337 | &afu->afu_map->global.fc_regs[i][FC_ERROR / 8]); |
| 1338 | writeq_be(0, &afu->afu_map->global.fc_regs[i][FC_ERRCAP / 8]); |
| 1339 | } |
| 1340 | |
| 1341 | /* sync interrupts for master's IOARRIN write */ |
| 1342 | /* note that unlike asyncs, there can be no pending sync interrupts */ |
| 1343 | /* at this time (this is a fresh context and master has not written */ |
| 1344 | /* IOARRIN yet), so there is nothing to clear. */ |
| 1345 | |
| 1346 | /* set LISN#, it is always sent to the context that wrote IOARRIN */ |
| 1347 | writeq_be(SISL_MSI_SYNC_ERROR, &afu->host_map->ctx_ctrl); |
| 1348 | writeq_be(SISL_ISTATUS_MASK, &afu->host_map->intr_mask); |
| 1349 | } |
| 1350 | |
| 1351 | /** |
| 1352 | * cxlflash_sync_err_irq() - interrupt handler for synchronous errors |
| 1353 | * @irq: Interrupt number. |
| 1354 | * @data: Private data provided at interrupt registration, the AFU. |
| 1355 | * |
| 1356 | * Return: Always return IRQ_HANDLED. |
| 1357 | */ |
| 1358 | static irqreturn_t cxlflash_sync_err_irq(int irq, void *data) |
| 1359 | { |
| 1360 | struct afu *afu = (struct afu *)data; |
| 1361 | u64 reg; |
| 1362 | u64 reg_unmasked; |
| 1363 | |
| 1364 | reg = readq_be(&afu->host_map->intr_status); |
| 1365 | reg_unmasked = (reg & SISL_ISTATUS_UNMASK); |
| 1366 | |
| 1367 | if (reg_unmasked == 0UL) { |
| 1368 | pr_err("%s: %llX: spurious interrupt, intr_status %016llX\n", |
| 1369 | __func__, (u64)afu, reg); |
| 1370 | goto cxlflash_sync_err_irq_exit; |
| 1371 | } |
| 1372 | |
| 1373 | pr_err("%s: %llX: unexpected interrupt, intr_status %016llX\n", |
| 1374 | __func__, (u64)afu, reg); |
| 1375 | |
| 1376 | writeq_be(reg_unmasked, &afu->host_map->intr_clear); |
| 1377 | |
| 1378 | cxlflash_sync_err_irq_exit: |
| 1379 | pr_debug("%s: returning rc=%d\n", __func__, IRQ_HANDLED); |
| 1380 | return IRQ_HANDLED; |
| 1381 | } |
| 1382 | |
| 1383 | /** |
| 1384 | * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path) |
| 1385 | * @irq: Interrupt number. |
| 1386 | * @data: Private data provided at interrupt registration, the AFU. |
| 1387 | * |
| 1388 | * Return: Always return IRQ_HANDLED. |
| 1389 | */ |
| 1390 | static irqreturn_t cxlflash_rrq_irq(int irq, void *data) |
| 1391 | { |
| 1392 | struct afu *afu = (struct afu *)data; |
| 1393 | struct afu_cmd *cmd; |
| 1394 | bool toggle = afu->toggle; |
| 1395 | u64 entry, |
| 1396 | *hrrq_start = afu->hrrq_start, |
| 1397 | *hrrq_end = afu->hrrq_end, |
| 1398 | *hrrq_curr = afu->hrrq_curr; |
| 1399 | |
| 1400 | /* Process however many RRQ entries that are ready */ |
| 1401 | while (true) { |
| 1402 | entry = *hrrq_curr; |
| 1403 | |
| 1404 | if ((entry & SISL_RESP_HANDLE_T_BIT) != toggle) |
| 1405 | break; |
| 1406 | |
| 1407 | cmd = (struct afu_cmd *)(entry & ~SISL_RESP_HANDLE_T_BIT); |
| 1408 | cmd_complete(cmd); |
| 1409 | |
| 1410 | /* Advance to next entry or wrap and flip the toggle bit */ |
| 1411 | if (hrrq_curr < hrrq_end) |
| 1412 | hrrq_curr++; |
| 1413 | else { |
| 1414 | hrrq_curr = hrrq_start; |
| 1415 | toggle ^= SISL_RESP_HANDLE_T_BIT; |
| 1416 | } |
| 1417 | } |
| 1418 | |
| 1419 | afu->hrrq_curr = hrrq_curr; |
| 1420 | afu->toggle = toggle; |
| 1421 | |
| 1422 | return IRQ_HANDLED; |
| 1423 | } |
| 1424 | |
| 1425 | /** |
| 1426 | * cxlflash_async_err_irq() - interrupt handler for asynchronous errors |
| 1427 | * @irq: Interrupt number. |
| 1428 | * @data: Private data provided at interrupt registration, the AFU. |
| 1429 | * |
| 1430 | * Return: Always return IRQ_HANDLED. |
| 1431 | */ |
| 1432 | static irqreturn_t cxlflash_async_err_irq(int irq, void *data) |
| 1433 | { |
| 1434 | struct afu *afu = (struct afu *)data; |
| 1435 | struct cxlflash_cfg *cfg; |
| 1436 | u64 reg_unmasked; |
| 1437 | const struct asyc_intr_info *info; |
| 1438 | struct sisl_global_map *global = &afu->afu_map->global; |
| 1439 | u64 reg; |
| 1440 | u8 port; |
| 1441 | int i; |
| 1442 | |
| 1443 | cfg = afu->parent; |
| 1444 | |
| 1445 | reg = readq_be(&global->regs.aintr_status); |
| 1446 | reg_unmasked = (reg & SISL_ASTATUS_UNMASK); |
| 1447 | |
| 1448 | if (reg_unmasked == 0) { |
| 1449 | pr_err("%s: spurious interrupt, aintr_status 0x%016llX\n", |
| 1450 | __func__, reg); |
| 1451 | goto out; |
| 1452 | } |
| 1453 | |
| 1454 | /* it is OK to clear AFU status before FC_ERROR */ |
| 1455 | writeq_be(reg_unmasked, &global->regs.aintr_clear); |
| 1456 | |
| 1457 | /* check each bit that is on */ |
| 1458 | for (i = 0; reg_unmasked; i++, reg_unmasked = (reg_unmasked >> 1)) { |
| 1459 | info = find_ainfo(1ULL << i); |
| 1460 | if ((reg_unmasked & 0x1) || !info) |
| 1461 | continue; |
| 1462 | |
| 1463 | port = info->port; |
| 1464 | |
| 1465 | pr_err("%s: FC Port %d -> %s, fc_status 0x%08llX\n", |
| 1466 | __func__, port, info->desc, |
| 1467 | readq_be(&global->fc_regs[port][FC_STATUS / 8])); |
| 1468 | |
| 1469 | /* |
| 1470 | * do link reset first, some OTHER errors will set FC_ERROR |
| 1471 | * again if cleared before or w/o a reset |
| 1472 | */ |
| 1473 | if (info->action & LINK_RESET) { |
| 1474 | pr_err("%s: FC Port %d: resetting link\n", |
| 1475 | __func__, port); |
| 1476 | cfg->lr_state = LINK_RESET_REQUIRED; |
| 1477 | cfg->lr_port = port; |
| 1478 | schedule_work(&cfg->work_q); |
| 1479 | } |
| 1480 | |
| 1481 | if (info->action & CLR_FC_ERROR) { |
| 1482 | reg = readq_be(&global->fc_regs[port][FC_ERROR / 8]); |
| 1483 | |
| 1484 | /* |
| 1485 | * since all errors are unmasked, FC_ERROR and FC_ERRCAP |
| 1486 | * should be the same and tracing one is sufficient. |
| 1487 | */ |
| 1488 | |
| 1489 | pr_err("%s: fc %d: clearing fc_error 0x%08llX\n", |
| 1490 | __func__, port, reg); |
| 1491 | |
| 1492 | writeq_be(reg, &global->fc_regs[port][FC_ERROR / 8]); |
| 1493 | writeq_be(0, &global->fc_regs[port][FC_ERRCAP / 8]); |
| 1494 | } |
| 1495 | } |
| 1496 | |
| 1497 | out: |
| 1498 | pr_debug("%s: returning rc=%d, afu=%p\n", __func__, IRQ_HANDLED, afu); |
| 1499 | return IRQ_HANDLED; |
| 1500 | } |
| 1501 | |
| 1502 | /** |
| 1503 | * start_context() - starts the master context |
| 1504 | * @cxlflash: Internal structure associated with the host. |
| 1505 | * |
| 1506 | * Return: A success or failure value from CXL services. |
| 1507 | */ |
| 1508 | static int start_context(struct cxlflash_cfg *cfg) |
| 1509 | { |
| 1510 | int rc = 0; |
| 1511 | |
| 1512 | rc = cxl_start_context(cfg->mcctx, |
| 1513 | cfg->afu->work.work_element_descriptor, |
| 1514 | NULL); |
| 1515 | |
| 1516 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
| 1517 | return rc; |
| 1518 | } |
| 1519 | |
| 1520 | /** |
| 1521 | * read_vpd() - obtains the WWPNs from VPD |
| 1522 | * @cxlflash: Internal structure associated with the host. |
| 1523 | * @wwpn: Array of size NUM_FC_PORTS to pass back WWPNs |
| 1524 | * |
| 1525 | * Return: |
| 1526 | * 0 on success |
| 1527 | * -ENODEV when VPD or WWPN keywords not found |
| 1528 | */ |
| 1529 | static int read_vpd(struct cxlflash_cfg *cfg, u64 wwpn[]) |
| 1530 | { |
| 1531 | struct pci_dev *dev = cfg->parent_dev; |
| 1532 | int rc = 0; |
| 1533 | int ro_start, ro_size, i, j, k; |
| 1534 | ssize_t vpd_size; |
| 1535 | char vpd_data[CXLFLASH_VPD_LEN]; |
| 1536 | char tmp_buf[WWPN_BUF_LEN] = { 0 }; |
| 1537 | char *wwpn_vpd_tags[NUM_FC_PORTS] = { "V5", "V6" }; |
| 1538 | |
| 1539 | /* Get the VPD data from the device */ |
| 1540 | vpd_size = pci_read_vpd(dev, 0, sizeof(vpd_data), vpd_data); |
| 1541 | if (unlikely(vpd_size <= 0)) { |
| 1542 | pr_err("%s: Unable to read VPD (size = %ld)\n", |
| 1543 | __func__, vpd_size); |
| 1544 | rc = -ENODEV; |
| 1545 | goto out; |
| 1546 | } |
| 1547 | |
| 1548 | /* Get the read only section offset */ |
| 1549 | ro_start = pci_vpd_find_tag(vpd_data, 0, vpd_size, |
| 1550 | PCI_VPD_LRDT_RO_DATA); |
| 1551 | if (unlikely(ro_start < 0)) { |
| 1552 | pr_err("%s: VPD Read-only data not found\n", __func__); |
| 1553 | rc = -ENODEV; |
| 1554 | goto out; |
| 1555 | } |
| 1556 | |
| 1557 | /* Get the read only section size, cap when extends beyond read VPD */ |
| 1558 | ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]); |
| 1559 | j = ro_size; |
| 1560 | i = ro_start + PCI_VPD_LRDT_TAG_SIZE; |
| 1561 | if (unlikely((i + j) > vpd_size)) { |
| 1562 | pr_debug("%s: Might need to read more VPD (%d > %ld)\n", |
| 1563 | __func__, (i + j), vpd_size); |
| 1564 | ro_size = vpd_size - i; |
| 1565 | } |
| 1566 | |
| 1567 | /* |
| 1568 | * Find the offset of the WWPN tag within the read only |
| 1569 | * VPD data and validate the found field (partials are |
| 1570 | * no good to us). Convert the ASCII data to an integer |
| 1571 | * value. Note that we must copy to a temporary buffer |
| 1572 | * because the conversion service requires that the ASCII |
| 1573 | * string be terminated. |
| 1574 | */ |
| 1575 | for (k = 0; k < NUM_FC_PORTS; k++) { |
| 1576 | j = ro_size; |
| 1577 | i = ro_start + PCI_VPD_LRDT_TAG_SIZE; |
| 1578 | |
| 1579 | i = pci_vpd_find_info_keyword(vpd_data, i, j, wwpn_vpd_tags[k]); |
| 1580 | if (unlikely(i < 0)) { |
| 1581 | pr_err("%s: Port %d WWPN not found in VPD\n", |
| 1582 | __func__, k); |
| 1583 | rc = -ENODEV; |
| 1584 | goto out; |
| 1585 | } |
| 1586 | |
| 1587 | j = pci_vpd_info_field_size(&vpd_data[i]); |
| 1588 | i += PCI_VPD_INFO_FLD_HDR_SIZE; |
| 1589 | if (unlikely((i + j > vpd_size) || (j != WWPN_LEN))) { |
| 1590 | pr_err("%s: Port %d WWPN incomplete or VPD corrupt\n", |
| 1591 | __func__, k); |
| 1592 | rc = -ENODEV; |
| 1593 | goto out; |
| 1594 | } |
| 1595 | |
| 1596 | memcpy(tmp_buf, &vpd_data[i], WWPN_LEN); |
| 1597 | rc = kstrtoul(tmp_buf, WWPN_LEN, (ulong *)&wwpn[k]); |
| 1598 | if (unlikely(rc)) { |
| 1599 | pr_err("%s: Fail to convert port %d WWPN to integer\n", |
| 1600 | __func__, k); |
| 1601 | rc = -ENODEV; |
| 1602 | goto out; |
| 1603 | } |
| 1604 | } |
| 1605 | |
| 1606 | out: |
| 1607 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
| 1608 | return rc; |
| 1609 | } |
| 1610 | |
| 1611 | /** |
| 1612 | * cxlflash_context_reset() - timeout handler for AFU commands |
| 1613 | * @cmd: AFU command that timed out. |
| 1614 | * |
| 1615 | * Sends a reset to the AFU. |
| 1616 | */ |
| 1617 | void cxlflash_context_reset(struct afu_cmd *cmd) |
| 1618 | { |
| 1619 | int nretry = 0; |
| 1620 | u64 rrin = 0x1; |
| 1621 | u64 room = 0; |
| 1622 | struct afu *afu = cmd->parent; |
| 1623 | ulong lock_flags; |
| 1624 | |
| 1625 | pr_debug("%s: cmd=%p\n", __func__, cmd); |
| 1626 | |
| 1627 | spin_lock_irqsave(&cmd->slock, lock_flags); |
| 1628 | |
| 1629 | /* Already completed? */ |
| 1630 | if (cmd->sa.host_use_b[0] & B_DONE) { |
| 1631 | spin_unlock_irqrestore(&cmd->slock, lock_flags); |
| 1632 | return; |
| 1633 | } |
| 1634 | |
| 1635 | cmd->sa.host_use_b[0] |= (B_DONE | B_ERROR | B_TIMEOUT); |
| 1636 | spin_unlock_irqrestore(&cmd->slock, lock_flags); |
| 1637 | |
| 1638 | /* |
| 1639 | * We really want to send this reset at all costs, so spread |
| 1640 | * out wait time on successive retries for available room. |
| 1641 | */ |
| 1642 | do { |
| 1643 | room = readq_be(&afu->host_map->cmd_room); |
| 1644 | atomic64_set(&afu->room, room); |
| 1645 | if (room) |
| 1646 | goto write_rrin; |
| 1647 | udelay(nretry); |
| 1648 | } while (nretry++ < MC_ROOM_RETRY_CNT); |
| 1649 | |
| 1650 | pr_err("%s: no cmd_room to send reset\n", __func__); |
| 1651 | return; |
| 1652 | |
| 1653 | write_rrin: |
| 1654 | nretry = 0; |
| 1655 | writeq_be(rrin, &afu->host_map->ioarrin); |
| 1656 | do { |
| 1657 | rrin = readq_be(&afu->host_map->ioarrin); |
| 1658 | if (rrin != 0x1) |
| 1659 | break; |
| 1660 | /* Double delay each time */ |
| 1661 | udelay(2 ^ nretry); |
| 1662 | } while (nretry++ < MC_ROOM_RETRY_CNT); |
| 1663 | } |
| 1664 | |
| 1665 | /** |
| 1666 | * init_pcr() - initialize the provisioning and control registers |
| 1667 | * @cxlflash: Internal structure associated with the host. |
| 1668 | * |
| 1669 | * Also sets up fast access to the mapped registers and initializes AFU |
| 1670 | * command fields that never change. |
| 1671 | */ |
| 1672 | void init_pcr(struct cxlflash_cfg *cfg) |
| 1673 | { |
| 1674 | struct afu *afu = cfg->afu; |
| 1675 | struct sisl_ctrl_map *ctrl_map; |
| 1676 | int i; |
| 1677 | |
| 1678 | for (i = 0; i < MAX_CONTEXT; i++) { |
| 1679 | ctrl_map = &afu->afu_map->ctrls[i].ctrl; |
| 1680 | /* disrupt any clients that could be running */ |
| 1681 | /* e. g. clients that survived a master restart */ |
| 1682 | writeq_be(0, &ctrl_map->rht_start); |
| 1683 | writeq_be(0, &ctrl_map->rht_cnt_id); |
| 1684 | writeq_be(0, &ctrl_map->ctx_cap); |
| 1685 | } |
| 1686 | |
| 1687 | /* copy frequently used fields into afu */ |
| 1688 | afu->ctx_hndl = (u16) cxl_process_element(cfg->mcctx); |
| 1689 | /* ctx_hndl is 16 bits in CAIA */ |
| 1690 | afu->host_map = &afu->afu_map->hosts[afu->ctx_hndl].host; |
| 1691 | afu->ctrl_map = &afu->afu_map->ctrls[afu->ctx_hndl].ctrl; |
| 1692 | |
| 1693 | /* Program the Endian Control for the master context */ |
| 1694 | writeq_be(SISL_ENDIAN_CTRL, &afu->host_map->endian_ctrl); |
| 1695 | |
| 1696 | /* initialize cmd fields that never change */ |
| 1697 | for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { |
| 1698 | afu->cmd[i].rcb.ctx_id = afu->ctx_hndl; |
| 1699 | afu->cmd[i].rcb.msi = SISL_MSI_RRQ_UPDATED; |
| 1700 | afu->cmd[i].rcb.rrq = 0x0; |
| 1701 | } |
| 1702 | } |
| 1703 | |
| 1704 | /** |
| 1705 | * init_global() - initialize AFU global registers |
| 1706 | * @cxlflash: Internal structure associated with the host. |
| 1707 | */ |
| 1708 | int init_global(struct cxlflash_cfg *cfg) |
| 1709 | { |
| 1710 | struct afu *afu = cfg->afu; |
| 1711 | u64 wwpn[NUM_FC_PORTS]; /* wwpn of AFU ports */ |
| 1712 | int i = 0, num_ports = 0; |
| 1713 | int rc = 0; |
| 1714 | u64 reg; |
| 1715 | |
| 1716 | rc = read_vpd(cfg, &wwpn[0]); |
| 1717 | if (rc) { |
| 1718 | pr_err("%s: could not read vpd rc=%d\n", __func__, rc); |
| 1719 | goto out; |
| 1720 | } |
| 1721 | |
| 1722 | pr_debug("%s: wwpn0=0x%llX wwpn1=0x%llX\n", __func__, wwpn[0], wwpn[1]); |
| 1723 | |
| 1724 | /* set up RRQ in AFU for master issued cmds */ |
| 1725 | writeq_be((u64) afu->hrrq_start, &afu->host_map->rrq_start); |
| 1726 | writeq_be((u64) afu->hrrq_end, &afu->host_map->rrq_end); |
| 1727 | |
| 1728 | /* AFU configuration */ |
| 1729 | reg = readq_be(&afu->afu_map->global.regs.afu_config); |
| 1730 | reg |= SISL_AFUCONF_AR_ALL|SISL_AFUCONF_ENDIAN; |
| 1731 | /* enable all auto retry options and control endianness */ |
| 1732 | /* leave others at default: */ |
| 1733 | /* CTX_CAP write protected, mbox_r does not clear on read and */ |
| 1734 | /* checker on if dual afu */ |
| 1735 | writeq_be(reg, &afu->afu_map->global.regs.afu_config); |
| 1736 | |
| 1737 | /* global port select: select either port */ |
| 1738 | if (afu->internal_lun) { |
| 1739 | /* only use port 0 */ |
| 1740 | writeq_be(PORT0, &afu->afu_map->global.regs.afu_port_sel); |
| 1741 | num_ports = NUM_FC_PORTS - 1; |
| 1742 | } else { |
| 1743 | writeq_be(BOTH_PORTS, &afu->afu_map->global.regs.afu_port_sel); |
| 1744 | num_ports = NUM_FC_PORTS; |
| 1745 | } |
| 1746 | |
| 1747 | for (i = 0; i < num_ports; i++) { |
| 1748 | /* unmask all errors (but they are still masked at AFU) */ |
| 1749 | writeq_be(0, &afu->afu_map->global.fc_regs[i][FC_ERRMSK / 8]); |
| 1750 | /* clear CRC error cnt & set a threshold */ |
| 1751 | (void)readq_be(&afu->afu_map->global. |
| 1752 | fc_regs[i][FC_CNT_CRCERR / 8]); |
| 1753 | writeq_be(MC_CRC_THRESH, &afu->afu_map->global.fc_regs[i] |
| 1754 | [FC_CRC_THRESH / 8]); |
| 1755 | |
| 1756 | /* set WWPNs. If already programmed, wwpn[i] is 0 */ |
| 1757 | if (wwpn[i] != 0 && |
| 1758 | afu_set_wwpn(afu, i, |
| 1759 | &afu->afu_map->global.fc_regs[i][0], |
| 1760 | wwpn[i])) { |
| 1761 | pr_err("%s: failed to set WWPN on port %d\n", |
| 1762 | __func__, i); |
| 1763 | rc = -EIO; |
| 1764 | goto out; |
| 1765 | } |
| 1766 | /* Programming WWPN back to back causes additional |
| 1767 | * offline/online transitions and a PLOGI |
| 1768 | */ |
| 1769 | msleep(100); |
| 1770 | |
| 1771 | } |
| 1772 | |
| 1773 | /* set up master's own CTX_CAP to allow real mode, host translation */ |
| 1774 | /* tbls, afu cmds and read/write GSCSI cmds. */ |
| 1775 | /* First, unlock ctx_cap write by reading mbox */ |
| 1776 | (void)readq_be(&afu->ctrl_map->mbox_r); /* unlock ctx_cap */ |
| 1777 | writeq_be((SISL_CTX_CAP_REAL_MODE | SISL_CTX_CAP_HOST_XLATE | |
| 1778 | SISL_CTX_CAP_READ_CMD | SISL_CTX_CAP_WRITE_CMD | |
| 1779 | SISL_CTX_CAP_AFU_CMD | SISL_CTX_CAP_GSCSI_CMD), |
| 1780 | &afu->ctrl_map->ctx_cap); |
| 1781 | /* init heartbeat */ |
| 1782 | afu->hb = readq_be(&afu->afu_map->global.regs.afu_hb); |
| 1783 | |
| 1784 | out: |
| 1785 | return rc; |
| 1786 | } |
| 1787 | |
| 1788 | /** |
| 1789 | * start_afu() - initializes and starts the AFU |
| 1790 | * @cxlflash: Internal structure associated with the host. |
| 1791 | */ |
| 1792 | static int start_afu(struct cxlflash_cfg *cfg) |
| 1793 | { |
| 1794 | struct afu *afu = cfg->afu; |
| 1795 | struct afu_cmd *cmd; |
| 1796 | |
| 1797 | int i = 0; |
| 1798 | int rc = 0; |
| 1799 | |
| 1800 | for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { |
| 1801 | cmd = &afu->cmd[i]; |
| 1802 | |
| 1803 | init_completion(&cmd->cevent); |
| 1804 | spin_lock_init(&cmd->slock); |
| 1805 | cmd->parent = afu; |
| 1806 | } |
| 1807 | |
| 1808 | init_pcr(cfg); |
| 1809 | |
| 1810 | /* initialize RRQ pointers */ |
| 1811 | afu->hrrq_start = &afu->rrq_entry[0]; |
| 1812 | afu->hrrq_end = &afu->rrq_entry[NUM_RRQ_ENTRY - 1]; |
| 1813 | afu->hrrq_curr = afu->hrrq_start; |
| 1814 | afu->toggle = 1; |
| 1815 | |
| 1816 | rc = init_global(cfg); |
| 1817 | |
| 1818 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
| 1819 | return rc; |
| 1820 | } |
| 1821 | |
| 1822 | /** |
| 1823 | * init_mc() - create and register as the master context |
| 1824 | * @cxlflash: Internal structure associated with the host. |
| 1825 | * |
| 1826 | * Return: |
| 1827 | * 0 on success |
| 1828 | * -ENOMEM when unable to obtain a context from CXL services |
| 1829 | * A failure value from CXL services. |
| 1830 | */ |
| 1831 | static int init_mc(struct cxlflash_cfg *cfg) |
| 1832 | { |
| 1833 | struct cxl_context *ctx; |
| 1834 | struct device *dev = &cfg->dev->dev; |
| 1835 | struct afu *afu = cfg->afu; |
| 1836 | int rc = 0; |
| 1837 | enum undo_level level; |
| 1838 | |
| 1839 | ctx = cxl_get_context(cfg->dev); |
| 1840 | if (unlikely(!ctx)) |
| 1841 | return -ENOMEM; |
| 1842 | cfg->mcctx = ctx; |
| 1843 | |
| 1844 | /* Set it up as a master with the CXL */ |
| 1845 | cxl_set_master(ctx); |
| 1846 | |
| 1847 | /* During initialization reset the AFU to start from a clean slate */ |
| 1848 | rc = cxl_afu_reset(cfg->mcctx); |
| 1849 | if (unlikely(rc)) { |
| 1850 | dev_err(dev, "%s: initial AFU reset failed rc=%d\n", |
| 1851 | __func__, rc); |
| 1852 | level = RELEASE_CONTEXT; |
| 1853 | goto out; |
| 1854 | } |
| 1855 | |
| 1856 | rc = cxl_allocate_afu_irqs(ctx, 3); |
| 1857 | if (unlikely(rc)) { |
| 1858 | dev_err(dev, "%s: call to allocate_afu_irqs failed rc=%d!\n", |
| 1859 | __func__, rc); |
| 1860 | level = RELEASE_CONTEXT; |
| 1861 | goto out; |
| 1862 | } |
| 1863 | |
| 1864 | rc = cxl_map_afu_irq(ctx, 1, cxlflash_sync_err_irq, afu, |
| 1865 | "SISL_MSI_SYNC_ERROR"); |
| 1866 | if (unlikely(rc <= 0)) { |
| 1867 | dev_err(dev, "%s: IRQ 1 (SISL_MSI_SYNC_ERROR) map failed!\n", |
| 1868 | __func__); |
| 1869 | level = FREE_IRQ; |
| 1870 | goto out; |
| 1871 | } |
| 1872 | |
| 1873 | rc = cxl_map_afu_irq(ctx, 2, cxlflash_rrq_irq, afu, |
| 1874 | "SISL_MSI_RRQ_UPDATED"); |
| 1875 | if (unlikely(rc <= 0)) { |
| 1876 | dev_err(dev, "%s: IRQ 2 (SISL_MSI_RRQ_UPDATED) map failed!\n", |
| 1877 | __func__); |
| 1878 | level = UNMAP_ONE; |
| 1879 | goto out; |
| 1880 | } |
| 1881 | |
| 1882 | rc = cxl_map_afu_irq(ctx, 3, cxlflash_async_err_irq, afu, |
| 1883 | "SISL_MSI_ASYNC_ERROR"); |
| 1884 | if (unlikely(rc <= 0)) { |
| 1885 | dev_err(dev, "%s: IRQ 3 (SISL_MSI_ASYNC_ERROR) map failed!\n", |
| 1886 | __func__); |
| 1887 | level = UNMAP_TWO; |
| 1888 | goto out; |
| 1889 | } |
| 1890 | |
| 1891 | rc = 0; |
| 1892 | |
| 1893 | /* This performs the equivalent of the CXL_IOCTL_START_WORK. |
| 1894 | * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process |
| 1895 | * element (pe) that is embedded in the context (ctx) |
| 1896 | */ |
| 1897 | rc = start_context(cfg); |
| 1898 | if (unlikely(rc)) { |
| 1899 | dev_err(dev, "%s: start context failed rc=%d\n", __func__, rc); |
| 1900 | level = UNMAP_THREE; |
| 1901 | goto out; |
| 1902 | } |
| 1903 | ret: |
| 1904 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
| 1905 | return rc; |
| 1906 | out: |
| 1907 | term_mc(cfg, level); |
| 1908 | goto ret; |
| 1909 | } |
| 1910 | |
| 1911 | /** |
| 1912 | * init_afu() - setup as master context and start AFU |
| 1913 | * @cxlflash: Internal structure associated with the host. |
| 1914 | * |
| 1915 | * This routine is a higher level of control for configuring the |
| 1916 | * AFU on probe and reset paths. |
| 1917 | * |
| 1918 | * Return: |
| 1919 | * 0 on success |
| 1920 | * -ENOMEM when unable to map the AFU MMIO space |
| 1921 | * A failure value from internal services. |
| 1922 | */ |
| 1923 | static int init_afu(struct cxlflash_cfg *cfg) |
| 1924 | { |
| 1925 | u64 reg; |
| 1926 | int rc = 0; |
| 1927 | struct afu *afu = cfg->afu; |
| 1928 | struct device *dev = &cfg->dev->dev; |
| 1929 | |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 1930 | cxl_perst_reloads_same_image(cfg->cxl_afu, true); |
| 1931 | |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 1932 | rc = init_mc(cfg); |
| 1933 | if (rc) { |
| 1934 | dev_err(dev, "%s: call to init_mc failed, rc=%d!\n", |
| 1935 | __func__, rc); |
| 1936 | goto err1; |
| 1937 | } |
| 1938 | |
| 1939 | /* Map the entire MMIO space of the AFU. |
| 1940 | */ |
| 1941 | afu->afu_map = cxl_psa_map(cfg->mcctx); |
| 1942 | if (!afu->afu_map) { |
| 1943 | rc = -ENOMEM; |
| 1944 | term_mc(cfg, UNDO_START); |
| 1945 | dev_err(dev, "%s: call to cxl_psa_map failed!\n", __func__); |
| 1946 | goto err1; |
| 1947 | } |
| 1948 | |
| 1949 | /* don't byte reverse on reading afu_version, else the string form */ |
| 1950 | /* will be backwards */ |
| 1951 | reg = afu->afu_map->global.regs.afu_version; |
| 1952 | memcpy(afu->version, ®, 8); |
| 1953 | afu->interface_version = |
| 1954 | readq_be(&afu->afu_map->global.regs.interface_version); |
| 1955 | pr_debug("%s: afu version %s, interface version 0x%llX\n", |
| 1956 | __func__, afu->version, afu->interface_version); |
| 1957 | |
| 1958 | rc = start_afu(cfg); |
| 1959 | if (rc) { |
| 1960 | dev_err(dev, "%s: call to start_afu failed, rc=%d!\n", |
| 1961 | __func__, rc); |
| 1962 | term_mc(cfg, UNDO_START); |
| 1963 | cxl_psa_unmap((void *)afu->afu_map); |
| 1964 | afu->afu_map = NULL; |
| 1965 | goto err1; |
| 1966 | } |
| 1967 | |
| 1968 | afu_err_intr_init(cfg->afu); |
| 1969 | atomic64_set(&afu->room, readq_be(&afu->host_map->cmd_room)); |
| 1970 | |
| 1971 | err1: |
| 1972 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
| 1973 | return rc; |
| 1974 | } |
| 1975 | |
| 1976 | /** |
| 1977 | * cxlflash_send_cmd() - sends an AFU command |
| 1978 | * @afu: AFU associated with the host. |
| 1979 | * @cmd: AFU command to send. |
| 1980 | * |
| 1981 | * Return: |
| 1982 | * 0 on success |
| 1983 | * -1 on failure |
| 1984 | */ |
| 1985 | int cxlflash_send_cmd(struct afu *afu, struct afu_cmd *cmd) |
| 1986 | { |
| 1987 | struct cxlflash_cfg *cfg = afu->parent; |
| 1988 | int nretry = 0; |
| 1989 | int rc = 0; |
| 1990 | u64 room; |
| 1991 | long newval; |
| 1992 | |
| 1993 | /* |
| 1994 | * This routine is used by critical users such an AFU sync and to |
| 1995 | * send a task management function (TMF). Thus we want to retry a |
| 1996 | * bit before returning an error. To avoid the performance penalty |
| 1997 | * of MMIO, we spread the update of 'room' over multiple commands. |
| 1998 | */ |
| 1999 | retry: |
| 2000 | newval = atomic64_dec_if_positive(&afu->room); |
| 2001 | if (!newval) { |
| 2002 | do { |
| 2003 | room = readq_be(&afu->host_map->cmd_room); |
| 2004 | atomic64_set(&afu->room, room); |
| 2005 | if (room) |
| 2006 | goto write_ioarrin; |
| 2007 | udelay(nretry); |
| 2008 | } while (nretry++ < MC_ROOM_RETRY_CNT); |
| 2009 | |
| 2010 | pr_err("%s: no cmd_room to send 0x%X\n", |
| 2011 | __func__, cmd->rcb.cdb[0]); |
| 2012 | |
| 2013 | goto no_room; |
| 2014 | } else if (unlikely(newval < 0)) { |
| 2015 | /* This should be rare. i.e. Only if two threads race and |
| 2016 | * decrement before the MMIO read is done. In this case |
| 2017 | * just benefit from the other thread having updated |
| 2018 | * afu->room. |
| 2019 | */ |
| 2020 | if (nretry++ < MC_ROOM_RETRY_CNT) { |
| 2021 | udelay(nretry); |
| 2022 | goto retry; |
| 2023 | } |
| 2024 | |
| 2025 | goto no_room; |
| 2026 | } |
| 2027 | |
| 2028 | write_ioarrin: |
| 2029 | writeq_be((u64)&cmd->rcb, &afu->host_map->ioarrin); |
| 2030 | out: |
| 2031 | pr_debug("%s: cmd=%p len=%d ea=%p rc=%d\n", __func__, cmd, |
| 2032 | cmd->rcb.data_len, (void *)cmd->rcb.data_ea, rc); |
| 2033 | return rc; |
| 2034 | |
| 2035 | no_room: |
| 2036 | afu->read_room = true; |
| 2037 | schedule_work(&cfg->work_q); |
| 2038 | rc = SCSI_MLQUEUE_HOST_BUSY; |
| 2039 | goto out; |
| 2040 | } |
| 2041 | |
| 2042 | /** |
| 2043 | * cxlflash_wait_resp() - polls for a response or timeout to a sent AFU command |
| 2044 | * @afu: AFU associated with the host. |
| 2045 | * @cmd: AFU command that was sent. |
| 2046 | */ |
| 2047 | void cxlflash_wait_resp(struct afu *afu, struct afu_cmd *cmd) |
| 2048 | { |
| 2049 | ulong timeout = jiffies + (cmd->rcb.timeout * 2 * HZ); |
| 2050 | |
| 2051 | timeout = wait_for_completion_timeout(&cmd->cevent, timeout); |
| 2052 | if (!timeout) |
| 2053 | cxlflash_context_reset(cmd); |
| 2054 | |
| 2055 | if (unlikely(cmd->sa.ioasc != 0)) |
| 2056 | pr_err("%s: CMD 0x%X failed, IOASC: flags 0x%X, afu_rc 0x%X, " |
| 2057 | "scsi_rc 0x%X, fc_rc 0x%X\n", __func__, cmd->rcb.cdb[0], |
| 2058 | cmd->sa.rc.flags, cmd->sa.rc.afu_rc, cmd->sa.rc.scsi_rc, |
| 2059 | cmd->sa.rc.fc_rc); |
| 2060 | } |
| 2061 | |
| 2062 | /** |
| 2063 | * cxlflash_afu_sync() - builds and sends an AFU sync command |
| 2064 | * @afu: AFU associated with the host. |
| 2065 | * @ctx_hndl_u: Identifies context requesting sync. |
| 2066 | * @res_hndl_u: Identifies resource requesting sync. |
| 2067 | * @mode: Type of sync to issue (lightweight, heavyweight, global). |
| 2068 | * |
| 2069 | * The AFU can only take 1 sync command at a time. This routine enforces this |
| 2070 | * limitation by using a mutex to provide exlusive access to the AFU during |
| 2071 | * the sync. This design point requires calling threads to not be on interrupt |
| 2072 | * context due to the possibility of sleeping during concurrent sync operations. |
| 2073 | * |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 2074 | * AFU sync operations are only necessary and allowed when the device is |
| 2075 | * operating normally. When not operating normally, sync requests can occur as |
| 2076 | * part of cleaning up resources associated with an adapter prior to removal. |
| 2077 | * In this scenario, these requests are simply ignored (safe due to the AFU |
| 2078 | * going away). |
| 2079 | * |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 2080 | * Return: |
| 2081 | * 0 on success |
| 2082 | * -1 on failure |
| 2083 | */ |
| 2084 | int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t ctx_hndl_u, |
| 2085 | res_hndl_t res_hndl_u, u8 mode) |
| 2086 | { |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 2087 | struct cxlflash_cfg *cfg = afu->parent; |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 2088 | struct afu_cmd *cmd = NULL; |
| 2089 | int rc = 0; |
| 2090 | int retry_cnt = 0; |
| 2091 | static DEFINE_MUTEX(sync_active); |
| 2092 | |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 2093 | if (cfg->state != STATE_NORMAL) { |
| 2094 | pr_debug("%s: Sync not required! (%u)\n", __func__, cfg->state); |
| 2095 | return 0; |
| 2096 | } |
| 2097 | |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 2098 | mutex_lock(&sync_active); |
| 2099 | retry: |
| 2100 | cmd = cxlflash_cmd_checkout(afu); |
| 2101 | if (unlikely(!cmd)) { |
| 2102 | retry_cnt++; |
| 2103 | udelay(1000 * retry_cnt); |
| 2104 | if (retry_cnt < MC_RETRY_CNT) |
| 2105 | goto retry; |
| 2106 | pr_err("%s: could not get a free command\n", __func__); |
| 2107 | rc = -1; |
| 2108 | goto out; |
| 2109 | } |
| 2110 | |
| 2111 | pr_debug("%s: afu=%p cmd=%p %d\n", __func__, afu, cmd, ctx_hndl_u); |
| 2112 | |
| 2113 | memset(cmd->rcb.cdb, 0, sizeof(cmd->rcb.cdb)); |
| 2114 | |
| 2115 | cmd->rcb.req_flags = SISL_REQ_FLAGS_AFU_CMD; |
| 2116 | cmd->rcb.port_sel = 0x0; /* NA */ |
| 2117 | cmd->rcb.lun_id = 0x0; /* NA */ |
| 2118 | cmd->rcb.data_len = 0x0; |
| 2119 | cmd->rcb.data_ea = 0x0; |
| 2120 | cmd->rcb.timeout = MC_AFU_SYNC_TIMEOUT; |
| 2121 | |
| 2122 | cmd->rcb.cdb[0] = 0xC0; /* AFU Sync */ |
| 2123 | cmd->rcb.cdb[1] = mode; |
| 2124 | |
| 2125 | /* The cdb is aligned, no unaligned accessors required */ |
| 2126 | *((u16 *)&cmd->rcb.cdb[2]) = swab16(ctx_hndl_u); |
| 2127 | *((u32 *)&cmd->rcb.cdb[4]) = swab32(res_hndl_u); |
| 2128 | |
| 2129 | rc = cxlflash_send_cmd(afu, cmd); |
| 2130 | if (unlikely(rc)) |
| 2131 | goto out; |
| 2132 | |
| 2133 | cxlflash_wait_resp(afu, cmd); |
| 2134 | |
| 2135 | /* set on timeout */ |
| 2136 | if (unlikely((cmd->sa.ioasc != 0) || |
| 2137 | (cmd->sa.host_use_b[0] & B_ERROR))) |
| 2138 | rc = -1; |
| 2139 | out: |
| 2140 | mutex_unlock(&sync_active); |
| 2141 | if (cmd) |
| 2142 | cxlflash_cmd_checkin(cmd); |
| 2143 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
| 2144 | return rc; |
| 2145 | } |
| 2146 | |
| 2147 | /** |
| 2148 | * cxlflash_afu_reset() - resets the AFU |
| 2149 | * @cxlflash: Internal structure associated with the host. |
| 2150 | * |
| 2151 | * Return: |
| 2152 | * 0 on success |
| 2153 | * A failure value from internal services. |
| 2154 | */ |
| 2155 | int cxlflash_afu_reset(struct cxlflash_cfg *cfg) |
| 2156 | { |
| 2157 | int rc = 0; |
| 2158 | /* Stop the context before the reset. Since the context is |
| 2159 | * no longer available restart it after the reset is complete |
| 2160 | */ |
| 2161 | |
| 2162 | term_afu(cfg); |
| 2163 | |
| 2164 | rc = init_afu(cfg); |
| 2165 | |
| 2166 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
| 2167 | return rc; |
| 2168 | } |
| 2169 | |
| 2170 | /** |
| 2171 | * cxlflash_worker_thread() - work thread handler for the AFU |
| 2172 | * @work: Work structure contained within cxlflash associated with host. |
| 2173 | * |
| 2174 | * Handles the following events: |
| 2175 | * - Link reset which cannot be performed on interrupt context due to |
| 2176 | * blocking up to a few seconds |
| 2177 | * - Read AFU command room |
| 2178 | */ |
| 2179 | static void cxlflash_worker_thread(struct work_struct *work) |
| 2180 | { |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 2181 | struct cxlflash_cfg *cfg = container_of(work, struct cxlflash_cfg, |
| 2182 | work_q); |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 2183 | struct afu *afu = cfg->afu; |
| 2184 | int port; |
| 2185 | ulong lock_flags; |
| 2186 | |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 2187 | /* Avoid MMIO if the device has failed */ |
| 2188 | |
| 2189 | if (cfg->state != STATE_NORMAL) |
| 2190 | return; |
| 2191 | |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 2192 | spin_lock_irqsave(cfg->host->host_lock, lock_flags); |
| 2193 | |
| 2194 | if (cfg->lr_state == LINK_RESET_REQUIRED) { |
| 2195 | port = cfg->lr_port; |
| 2196 | if (port < 0) |
| 2197 | pr_err("%s: invalid port index %d\n", __func__, port); |
| 2198 | else { |
| 2199 | spin_unlock_irqrestore(cfg->host->host_lock, |
| 2200 | lock_flags); |
| 2201 | |
| 2202 | /* The reset can block... */ |
| 2203 | afu_link_reset(afu, port, |
| 2204 | &afu->afu_map-> |
| 2205 | global.fc_regs[port][0]); |
| 2206 | spin_lock_irqsave(cfg->host->host_lock, lock_flags); |
| 2207 | } |
| 2208 | |
| 2209 | cfg->lr_state = LINK_RESET_COMPLETE; |
| 2210 | } |
| 2211 | |
| 2212 | if (afu->read_room) { |
| 2213 | atomic64_set(&afu->room, readq_be(&afu->host_map->cmd_room)); |
| 2214 | afu->read_room = false; |
| 2215 | } |
| 2216 | |
| 2217 | spin_unlock_irqrestore(cfg->host->host_lock, lock_flags); |
| 2218 | } |
| 2219 | |
| 2220 | /** |
| 2221 | * cxlflash_probe() - PCI entry point to add host |
| 2222 | * @pdev: PCI device associated with the host. |
| 2223 | * @dev_id: PCI device id associated with device. |
| 2224 | * |
| 2225 | * Return: 0 on success / non-zero on failure |
| 2226 | */ |
| 2227 | static int cxlflash_probe(struct pci_dev *pdev, |
| 2228 | const struct pci_device_id *dev_id) |
| 2229 | { |
| 2230 | struct Scsi_Host *host; |
| 2231 | struct cxlflash_cfg *cfg = NULL; |
| 2232 | struct device *phys_dev; |
| 2233 | struct dev_dependent_vals *ddv; |
| 2234 | int rc = 0; |
| 2235 | |
| 2236 | dev_dbg(&pdev->dev, "%s: Found CXLFLASH with IRQ: %d\n", |
| 2237 | __func__, pdev->irq); |
| 2238 | |
| 2239 | ddv = (struct dev_dependent_vals *)dev_id->driver_data; |
| 2240 | driver_template.max_sectors = ddv->max_sectors; |
| 2241 | |
| 2242 | host = scsi_host_alloc(&driver_template, sizeof(struct cxlflash_cfg)); |
| 2243 | if (!host) { |
| 2244 | dev_err(&pdev->dev, "%s: call to scsi_host_alloc failed!\n", |
| 2245 | __func__); |
| 2246 | rc = -ENOMEM; |
| 2247 | goto out; |
| 2248 | } |
| 2249 | |
| 2250 | host->max_id = CXLFLASH_MAX_NUM_TARGETS_PER_BUS; |
| 2251 | host->max_lun = CXLFLASH_MAX_NUM_LUNS_PER_TARGET; |
| 2252 | host->max_channel = NUM_FC_PORTS - 1; |
| 2253 | host->unique_id = host->host_no; |
| 2254 | host->max_cmd_len = CXLFLASH_MAX_CDB_LEN; |
| 2255 | |
| 2256 | cfg = (struct cxlflash_cfg *)host->hostdata; |
| 2257 | cfg->host = host; |
| 2258 | rc = alloc_mem(cfg); |
| 2259 | if (rc) { |
| 2260 | dev_err(&pdev->dev, "%s: call to scsi_host_alloc failed!\n", |
| 2261 | __func__); |
| 2262 | rc = -ENOMEM; |
| 2263 | goto out; |
| 2264 | } |
| 2265 | |
| 2266 | cfg->init_state = INIT_STATE_NONE; |
| 2267 | cfg->dev = pdev; |
| 2268 | cfg->dev_id = (struct pci_device_id *)dev_id; |
| 2269 | cfg->mcctx = NULL; |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 2270 | |
| 2271 | init_waitqueue_head(&cfg->tmf_waitq); |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 2272 | init_waitqueue_head(&cfg->limbo_waitq); |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 2273 | |
| 2274 | INIT_WORK(&cfg->work_q, cxlflash_worker_thread); |
| 2275 | cfg->lr_state = LINK_RESET_INVALID; |
| 2276 | cfg->lr_port = -1; |
| 2277 | |
| 2278 | pci_set_drvdata(pdev, cfg); |
| 2279 | |
| 2280 | /* Use the special service provided to look up the physical |
| 2281 | * PCI device, since we are called on the probe of the virtual |
| 2282 | * PCI host bus (vphb) |
| 2283 | */ |
| 2284 | phys_dev = cxl_get_phys_dev(pdev); |
| 2285 | if (!dev_is_pci(phys_dev)) { |
| 2286 | pr_err("%s: not a pci dev\n", __func__); |
| 2287 | rc = -ENODEV; |
| 2288 | goto out_remove; |
| 2289 | } |
| 2290 | cfg->parent_dev = to_pci_dev(phys_dev); |
| 2291 | |
| 2292 | cfg->cxl_afu = cxl_pci_to_afu(pdev); |
| 2293 | |
| 2294 | rc = init_pci(cfg); |
| 2295 | if (rc) { |
| 2296 | dev_err(&pdev->dev, "%s: call to init_pci " |
| 2297 | "failed rc=%d!\n", __func__, rc); |
| 2298 | goto out_remove; |
| 2299 | } |
| 2300 | cfg->init_state = INIT_STATE_PCI; |
| 2301 | |
| 2302 | rc = init_afu(cfg); |
| 2303 | if (rc) { |
| 2304 | dev_err(&pdev->dev, "%s: call to init_afu " |
| 2305 | "failed rc=%d!\n", __func__, rc); |
| 2306 | goto out_remove; |
| 2307 | } |
| 2308 | cfg->init_state = INIT_STATE_AFU; |
| 2309 | |
| 2310 | |
| 2311 | rc = init_scsi(cfg); |
| 2312 | if (rc) { |
| 2313 | dev_err(&pdev->dev, "%s: call to init_scsi " |
| 2314 | "failed rc=%d!\n", __func__, rc); |
| 2315 | goto out_remove; |
| 2316 | } |
| 2317 | cfg->init_state = INIT_STATE_SCSI; |
| 2318 | |
| 2319 | out: |
| 2320 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
| 2321 | return rc; |
| 2322 | |
| 2323 | out_remove: |
| 2324 | cxlflash_remove(pdev); |
| 2325 | goto out; |
| 2326 | } |
| 2327 | |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 2328 | /** |
| 2329 | * cxlflash_pci_error_detected() - called when a PCI error is detected |
| 2330 | * @pdev: PCI device struct. |
| 2331 | * @state: PCI channel state. |
| 2332 | * |
| 2333 | * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT |
| 2334 | */ |
| 2335 | static pci_ers_result_t cxlflash_pci_error_detected(struct pci_dev *pdev, |
| 2336 | pci_channel_state_t state) |
| 2337 | { |
| 2338 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); |
| 2339 | struct device *dev = &cfg->dev->dev; |
| 2340 | |
| 2341 | dev_dbg(dev, "%s: pdev=%p state=%u\n", __func__, pdev, state); |
| 2342 | |
| 2343 | switch (state) { |
| 2344 | case pci_channel_io_frozen: |
| 2345 | cfg->state = STATE_LIMBO; |
| 2346 | |
| 2347 | /* Turn off legacy I/O */ |
| 2348 | scsi_block_requests(cfg->host); |
| 2349 | |
| 2350 | term_mc(cfg, UNDO_START); |
| 2351 | stop_afu(cfg); |
| 2352 | |
| 2353 | return PCI_ERS_RESULT_NEED_RESET; |
| 2354 | case pci_channel_io_perm_failure: |
| 2355 | cfg->state = STATE_FAILTERM; |
| 2356 | wake_up_all(&cfg->limbo_waitq); |
| 2357 | scsi_unblock_requests(cfg->host); |
| 2358 | return PCI_ERS_RESULT_DISCONNECT; |
| 2359 | default: |
| 2360 | break; |
| 2361 | } |
| 2362 | return PCI_ERS_RESULT_NEED_RESET; |
| 2363 | } |
| 2364 | |
| 2365 | /** |
| 2366 | * cxlflash_pci_slot_reset() - called when PCI slot has been reset |
| 2367 | * @pdev: PCI device struct. |
| 2368 | * |
| 2369 | * This routine is called by the pci error recovery code after the PCI |
| 2370 | * slot has been reset, just before we should resume normal operations. |
| 2371 | * |
| 2372 | * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT |
| 2373 | */ |
| 2374 | static pci_ers_result_t cxlflash_pci_slot_reset(struct pci_dev *pdev) |
| 2375 | { |
| 2376 | int rc = 0; |
| 2377 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); |
| 2378 | struct device *dev = &cfg->dev->dev; |
| 2379 | |
| 2380 | dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev); |
| 2381 | |
| 2382 | rc = init_afu(cfg); |
| 2383 | if (unlikely(rc)) { |
| 2384 | dev_err(dev, "%s: EEH recovery failed! (%d)\n", __func__, rc); |
| 2385 | return PCI_ERS_RESULT_DISCONNECT; |
| 2386 | } |
| 2387 | |
| 2388 | return PCI_ERS_RESULT_RECOVERED; |
| 2389 | } |
| 2390 | |
| 2391 | /** |
| 2392 | * cxlflash_pci_resume() - called when normal operation can resume |
| 2393 | * @pdev: PCI device struct |
| 2394 | */ |
| 2395 | static void cxlflash_pci_resume(struct pci_dev *pdev) |
| 2396 | { |
| 2397 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); |
| 2398 | struct device *dev = &cfg->dev->dev; |
| 2399 | |
| 2400 | dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev); |
| 2401 | |
| 2402 | cfg->state = STATE_NORMAL; |
| 2403 | wake_up_all(&cfg->limbo_waitq); |
| 2404 | scsi_unblock_requests(cfg->host); |
| 2405 | } |
| 2406 | |
| 2407 | static const struct pci_error_handlers cxlflash_err_handler = { |
| 2408 | .error_detected = cxlflash_pci_error_detected, |
| 2409 | .slot_reset = cxlflash_pci_slot_reset, |
| 2410 | .resume = cxlflash_pci_resume, |
| 2411 | }; |
| 2412 | |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 2413 | /* |
| 2414 | * PCI device structure |
| 2415 | */ |
| 2416 | static struct pci_driver cxlflash_driver = { |
| 2417 | .name = CXLFLASH_NAME, |
| 2418 | .id_table = cxlflash_pci_table, |
| 2419 | .probe = cxlflash_probe, |
| 2420 | .remove = cxlflash_remove, |
Matthew R. Ochs | 5cdac81 | 2015-08-13 21:47:34 -0500 | [diff] [blame^] | 2421 | .err_handler = &cxlflash_err_handler, |
Matthew R. Ochs | c21e0bb | 2015-06-09 17:15:52 -0500 | [diff] [blame] | 2422 | }; |
| 2423 | |
| 2424 | /** |
| 2425 | * init_cxlflash() - module entry point |
| 2426 | * |
| 2427 | * Return: 0 on success / non-zero on failure |
| 2428 | */ |
| 2429 | static int __init init_cxlflash(void) |
| 2430 | { |
| 2431 | pr_info("%s: IBM Power CXL Flash Adapter: %s\n", |
| 2432 | __func__, CXLFLASH_DRIVER_DATE); |
| 2433 | |
| 2434 | return pci_register_driver(&cxlflash_driver); |
| 2435 | } |
| 2436 | |
| 2437 | /** |
| 2438 | * exit_cxlflash() - module exit point |
| 2439 | */ |
| 2440 | static void __exit exit_cxlflash(void) |
| 2441 | { |
| 2442 | pci_unregister_driver(&cxlflash_driver); |
| 2443 | } |
| 2444 | |
| 2445 | module_init(init_cxlflash); |
| 2446 | module_exit(exit_cxlflash); |