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c21e0bbf MO |
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; | |
356 | struct afu_cmd *cmd; | |
357 | u32 port_sel = scp->device->channel + 1; | |
358 | int nseg, i, ncount; | |
359 | struct scatterlist *sg; | |
360 | ulong lock_flags; | |
361 | short lflag = 0; | |
362 | int rc = 0; | |
363 | ||
364 | pr_debug("%s: (scp=%p) %d/%d/%d/%llu cdb=(%08X-%08X-%08X-%08X)\n", | |
365 | __func__, scp, host->host_no, scp->device->channel, | |
366 | scp->device->id, scp->device->lun, | |
367 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
368 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
369 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
370 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
371 | ||
372 | /* If a Task Management Function is active, wait for it to complete | |
373 | * before continuing with regular commands. | |
374 | */ | |
375 | spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags); | |
376 | if (cfg->tmf_active) { | |
377 | spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags); | |
378 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
379 | goto out; | |
380 | } | |
381 | spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags); | |
382 | ||
383 | cmd = cxlflash_cmd_checkout(afu); | |
384 | if (unlikely(!cmd)) { | |
385 | pr_err("%s: could not get a free command\n", __func__); | |
386 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
387 | goto out; | |
388 | } | |
389 | ||
390 | cmd->rcb.ctx_id = afu->ctx_hndl; | |
391 | cmd->rcb.port_sel = port_sel; | |
392 | cmd->rcb.lun_id = lun_to_lunid(scp->device->lun); | |
393 | ||
394 | if (scp->sc_data_direction == DMA_TO_DEVICE) | |
395 | lflag = SISL_REQ_FLAGS_HOST_WRITE; | |
396 | else | |
397 | lflag = SISL_REQ_FLAGS_HOST_READ; | |
398 | ||
399 | cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID | | |
400 | SISL_REQ_FLAGS_SUP_UNDERRUN | lflag); | |
401 | ||
402 | /* Stash the scp in the reserved field, for reuse during interrupt */ | |
403 | cmd->rcb.scp = scp; | |
404 | ||
405 | nseg = scsi_dma_map(scp); | |
406 | if (unlikely(nseg < 0)) { | |
407 | dev_err(&pdev->dev, "%s: Fail DMA map! nseg=%d\n", | |
408 | __func__, nseg); | |
409 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
410 | goto out; | |
411 | } | |
412 | ||
413 | ncount = scsi_sg_count(scp); | |
414 | scsi_for_each_sg(scp, sg, ncount, i) { | |
415 | cmd->rcb.data_len = sg_dma_len(sg); | |
416 | cmd->rcb.data_ea = sg_dma_address(sg); | |
417 | } | |
418 | ||
419 | /* Copy the CDB from the scsi_cmnd passed in */ | |
420 | memcpy(cmd->rcb.cdb, scp->cmnd, sizeof(cmd->rcb.cdb)); | |
421 | ||
422 | /* Send the command */ | |
423 | rc = cxlflash_send_cmd(afu, cmd); | |
424 | if (unlikely(rc)) { | |
425 | cxlflash_cmd_checkin(cmd); | |
426 | scsi_dma_unmap(scp); | |
427 | } | |
428 | ||
429 | out: | |
430 | return rc; | |
431 | } | |
432 | ||
433 | /** | |
434 | * cxlflash_eh_device_reset_handler() - reset a single LUN | |
435 | * @scp: SCSI command to send. | |
436 | * | |
437 | * Return: | |
438 | * SUCCESS as defined in scsi/scsi.h | |
439 | * FAILED as defined in scsi/scsi.h | |
440 | */ | |
441 | static int cxlflash_eh_device_reset_handler(struct scsi_cmnd *scp) | |
442 | { | |
443 | int rc = SUCCESS; | |
444 | struct Scsi_Host *host = scp->device->host; | |
445 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; | |
446 | struct afu *afu = cfg->afu; | |
447 | int rcr = 0; | |
448 | ||
449 | pr_debug("%s: (scp=%p) %d/%d/%d/%llu " | |
450 | "cdb=(%08X-%08X-%08X-%08X)\n", __func__, scp, | |
451 | host->host_no, scp->device->channel, | |
452 | scp->device->id, scp->device->lun, | |
453 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
454 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
455 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
456 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
457 | ||
458 | rcr = send_tmf(afu, scp, TMF_LUN_RESET); | |
459 | if (unlikely(rcr)) | |
460 | rc = FAILED; | |
461 | ||
462 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
463 | return rc; | |
464 | } | |
465 | ||
466 | /** | |
467 | * cxlflash_eh_host_reset_handler() - reset the host adapter | |
468 | * @scp: SCSI command from stack identifying host. | |
469 | * | |
470 | * Return: | |
471 | * SUCCESS as defined in scsi/scsi.h | |
472 | * FAILED as defined in scsi/scsi.h | |
473 | */ | |
474 | static int cxlflash_eh_host_reset_handler(struct scsi_cmnd *scp) | |
475 | { | |
476 | int rc = SUCCESS; | |
477 | int rcr = 0; | |
478 | struct Scsi_Host *host = scp->device->host; | |
479 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; | |
480 | ||
481 | pr_debug("%s: (scp=%p) %d/%d/%d/%llu " | |
482 | "cdb=(%08X-%08X-%08X-%08X)\n", __func__, scp, | |
483 | host->host_no, scp->device->channel, | |
484 | scp->device->id, scp->device->lun, | |
485 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
486 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
487 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
488 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
489 | ||
490 | rcr = cxlflash_afu_reset(cfg); | |
491 | if (rcr == 0) | |
492 | rc = SUCCESS; | |
493 | else | |
494 | rc = FAILED; | |
495 | ||
496 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
497 | return rc; | |
498 | } | |
499 | ||
500 | /** | |
501 | * cxlflash_change_queue_depth() - change the queue depth for the device | |
502 | * @sdev: SCSI device destined for queue depth change. | |
503 | * @qdepth: Requested queue depth value to set. | |
504 | * | |
505 | * The requested queue depth is capped to the maximum supported value. | |
506 | * | |
507 | * Return: The actual queue depth set. | |
508 | */ | |
509 | static int cxlflash_change_queue_depth(struct scsi_device *sdev, int qdepth) | |
510 | { | |
511 | ||
512 | if (qdepth > CXLFLASH_MAX_CMDS_PER_LUN) | |
513 | qdepth = CXLFLASH_MAX_CMDS_PER_LUN; | |
514 | ||
515 | scsi_change_queue_depth(sdev, qdepth); | |
516 | return sdev->queue_depth; | |
517 | } | |
518 | ||
519 | /** | |
520 | * cxlflash_show_port_status() - queries and presents the current port status | |
521 | * @dev: Generic device associated with the host owning the port. | |
522 | * @attr: Device attribute representing the port. | |
523 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
524 | * | |
525 | * Return: The size of the ASCII string returned in @buf. | |
526 | */ | |
527 | static ssize_t cxlflash_show_port_status(struct device *dev, | |
528 | struct device_attribute *attr, | |
529 | char *buf) | |
530 | { | |
531 | struct Scsi_Host *shost = class_to_shost(dev); | |
532 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
533 | struct afu *afu = cfg->afu; | |
534 | ||
535 | char *disp_status; | |
536 | int rc; | |
537 | u32 port; | |
538 | u64 status; | |
539 | u64 *fc_regs; | |
540 | ||
541 | rc = kstrtouint((attr->attr.name + 4), 10, &port); | |
542 | if (rc || (port > NUM_FC_PORTS)) | |
543 | return 0; | |
544 | ||
545 | fc_regs = &afu->afu_map->global.fc_regs[port][0]; | |
546 | status = | |
547 | (readq_be(&fc_regs[FC_MTIP_STATUS / 8]) & FC_MTIP_STATUS_MASK); | |
548 | ||
549 | if (status == FC_MTIP_STATUS_ONLINE) | |
550 | disp_status = "online"; | |
551 | else if (status == FC_MTIP_STATUS_OFFLINE) | |
552 | disp_status = "offline"; | |
553 | else | |
554 | disp_status = "unknown"; | |
555 | ||
556 | return snprintf(buf, PAGE_SIZE, "%s\n", disp_status); | |
557 | } | |
558 | ||
559 | /** | |
560 | * cxlflash_show_lun_mode() - presents the current LUN mode of the host | |
561 | * @dev: Generic device associated with the host. | |
562 | * @attr: Device attribute representing the lun mode. | |
563 | * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII. | |
564 | * | |
565 | * Return: The size of the ASCII string returned in @buf. | |
566 | */ | |
567 | static ssize_t cxlflash_show_lun_mode(struct device *dev, | |
568 | struct device_attribute *attr, char *buf) | |
569 | { | |
570 | struct Scsi_Host *shost = class_to_shost(dev); | |
571 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
572 | struct afu *afu = cfg->afu; | |
573 | ||
574 | return snprintf(buf, PAGE_SIZE, "%u\n", afu->internal_lun); | |
575 | } | |
576 | ||
577 | /** | |
578 | * cxlflash_store_lun_mode() - sets the LUN mode of the host | |
579 | * @dev: Generic device associated with the host. | |
580 | * @attr: Device attribute representing the lun mode. | |
581 | * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII. | |
582 | * @count: Length of data resizing in @buf. | |
583 | * | |
584 | * The CXL Flash AFU supports a dummy LUN mode where the external | |
585 | * links and storage are not required. Space on the FPGA is used | |
586 | * to create 1 or 2 small LUNs which are presented to the system | |
587 | * as if they were a normal storage device. This feature is useful | |
588 | * during development and also provides manufacturing with a way | |
589 | * to test the AFU without an actual device. | |
590 | * | |
591 | * 0 = external LUN[s] (default) | |
592 | * 1 = internal LUN (1 x 64K, 512B blocks, id 0) | |
593 | * 2 = internal LUN (1 x 64K, 4K blocks, id 0) | |
594 | * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1) | |
595 | * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1) | |
596 | * | |
597 | * Return: The size of the ASCII string returned in @buf. | |
598 | */ | |
599 | static ssize_t cxlflash_store_lun_mode(struct device *dev, | |
600 | struct device_attribute *attr, | |
601 | const char *buf, size_t count) | |
602 | { | |
603 | struct Scsi_Host *shost = class_to_shost(dev); | |
604 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
605 | struct afu *afu = cfg->afu; | |
606 | int rc; | |
607 | u32 lun_mode; | |
608 | ||
609 | rc = kstrtouint(buf, 10, &lun_mode); | |
610 | if (!rc && (lun_mode < 5) && (lun_mode != afu->internal_lun)) { | |
611 | afu->internal_lun = lun_mode; | |
612 | cxlflash_afu_reset(cfg); | |
613 | scsi_scan_host(cfg->host); | |
614 | } | |
615 | ||
616 | return count; | |
617 | } | |
618 | ||
619 | /** | |
620 | * cxlflash_show_dev_mode() - presents the current mode of the device | |
621 | * @dev: Generic device associated with the device. | |
622 | * @attr: Device attribute representing the device mode. | |
623 | * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII. | |
624 | * | |
625 | * Return: The size of the ASCII string returned in @buf. | |
626 | */ | |
627 | static ssize_t cxlflash_show_dev_mode(struct device *dev, | |
628 | struct device_attribute *attr, char *buf) | |
629 | { | |
630 | struct scsi_device *sdev = to_scsi_device(dev); | |
631 | ||
632 | return snprintf(buf, PAGE_SIZE, "%s\n", | |
633 | sdev->hostdata ? "superpipe" : "legacy"); | |
634 | } | |
635 | ||
636 | /** | |
637 | * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe | |
638 | * @cxlflash: Internal structure associated with the host. | |
639 | */ | |
640 | static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg *cfg) | |
641 | { | |
642 | struct pci_dev *pdev = cfg->dev; | |
643 | ||
644 | if (pci_channel_offline(pdev)) | |
645 | wait_event_timeout(cfg->eeh_waitq, | |
646 | !pci_channel_offline(pdev), | |
647 | CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT); | |
648 | } | |
649 | ||
650 | /* | |
651 | * Host attributes | |
652 | */ | |
653 | static DEVICE_ATTR(port0, S_IRUGO, cxlflash_show_port_status, NULL); | |
654 | static DEVICE_ATTR(port1, S_IRUGO, cxlflash_show_port_status, NULL); | |
655 | static DEVICE_ATTR(lun_mode, S_IRUGO | S_IWUSR, cxlflash_show_lun_mode, | |
656 | cxlflash_store_lun_mode); | |
657 | ||
658 | static struct device_attribute *cxlflash_host_attrs[] = { | |
659 | &dev_attr_port0, | |
660 | &dev_attr_port1, | |
661 | &dev_attr_lun_mode, | |
662 | NULL | |
663 | }; | |
664 | ||
665 | /* | |
666 | * Device attributes | |
667 | */ | |
668 | static DEVICE_ATTR(mode, S_IRUGO, cxlflash_show_dev_mode, NULL); | |
669 | ||
670 | static struct device_attribute *cxlflash_dev_attrs[] = { | |
671 | &dev_attr_mode, | |
672 | NULL | |
673 | }; | |
674 | ||
675 | /* | |
676 | * Host template | |
677 | */ | |
678 | static struct scsi_host_template driver_template = { | |
679 | .module = THIS_MODULE, | |
680 | .name = CXLFLASH_ADAPTER_NAME, | |
681 | .info = cxlflash_driver_info, | |
682 | .proc_name = CXLFLASH_NAME, | |
683 | .queuecommand = cxlflash_queuecommand, | |
684 | .eh_device_reset_handler = cxlflash_eh_device_reset_handler, | |
685 | .eh_host_reset_handler = cxlflash_eh_host_reset_handler, | |
686 | .change_queue_depth = cxlflash_change_queue_depth, | |
687 | .cmd_per_lun = 16, | |
688 | .can_queue = CXLFLASH_MAX_CMDS, | |
689 | .this_id = -1, | |
690 | .sg_tablesize = SG_NONE, /* No scatter gather support. */ | |
691 | .max_sectors = CXLFLASH_MAX_SECTORS, | |
692 | .use_clustering = ENABLE_CLUSTERING, | |
693 | .shost_attrs = cxlflash_host_attrs, | |
694 | .sdev_attrs = cxlflash_dev_attrs, | |
695 | }; | |
696 | ||
697 | /* | |
698 | * Device dependent values | |
699 | */ | |
700 | static struct dev_dependent_vals dev_corsa_vals = { CXLFLASH_MAX_SECTORS }; | |
701 | ||
702 | /* | |
703 | * PCI device binding table | |
704 | */ | |
705 | static struct pci_device_id cxlflash_pci_table[] = { | |
706 | {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CORSA, | |
707 | PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_corsa_vals}, | |
708 | {} | |
709 | }; | |
710 | ||
711 | MODULE_DEVICE_TABLE(pci, cxlflash_pci_table); | |
712 | ||
713 | /** | |
714 | * free_mem() - free memory associated with the AFU | |
715 | * @cxlflash: Internal structure associated with the host. | |
716 | */ | |
717 | static void free_mem(struct cxlflash_cfg *cfg) | |
718 | { | |
719 | int i; | |
720 | char *buf = NULL; | |
721 | struct afu *afu = cfg->afu; | |
722 | ||
723 | if (cfg->afu) { | |
724 | for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { | |
725 | buf = afu->cmd[i].buf; | |
726 | if (!((u64)buf & (PAGE_SIZE - 1))) | |
727 | free_page((ulong)buf); | |
728 | } | |
729 | ||
730 | free_pages((ulong)afu, get_order(sizeof(struct afu))); | |
731 | cfg->afu = NULL; | |
732 | } | |
733 | } | |
734 | ||
735 | /** | |
736 | * stop_afu() - stops the AFU command timers and unmaps the MMIO space | |
737 | * @cxlflash: Internal structure associated with the host. | |
738 | * | |
739 | * Safe to call with AFU in a partially allocated/initialized state. | |
740 | */ | |
741 | static void stop_afu(struct cxlflash_cfg *cfg) | |
742 | { | |
743 | int i; | |
744 | struct afu *afu = cfg->afu; | |
745 | ||
746 | if (likely(afu)) { | |
747 | for (i = 0; i < CXLFLASH_NUM_CMDS; i++) | |
748 | complete(&afu->cmd[i].cevent); | |
749 | ||
750 | if (likely(afu->afu_map)) { | |
751 | cxl_psa_unmap((void *)afu->afu_map); | |
752 | afu->afu_map = NULL; | |
753 | } | |
754 | } | |
755 | } | |
756 | ||
757 | /** | |
758 | * term_mc() - terminates the master context | |
759 | * @cxlflash: Internal structure associated with the host. | |
760 | * @level: Depth of allocation, where to begin waterfall tear down. | |
761 | * | |
762 | * Safe to call with AFU/MC in partially allocated/initialized state. | |
763 | */ | |
764 | static void term_mc(struct cxlflash_cfg *cfg, enum undo_level level) | |
765 | { | |
766 | int rc = 0; | |
767 | struct afu *afu = cfg->afu; | |
768 | ||
769 | if (!afu || !cfg->mcctx) { | |
770 | pr_err("%s: returning from term_mc with NULL afu or MC\n", | |
771 | __func__); | |
772 | return; | |
773 | } | |
774 | ||
775 | switch (level) { | |
776 | case UNDO_START: | |
777 | rc = cxl_stop_context(cfg->mcctx); | |
778 | BUG_ON(rc); | |
779 | case UNMAP_THREE: | |
780 | cxl_unmap_afu_irq(cfg->mcctx, 3, afu); | |
781 | case UNMAP_TWO: | |
782 | cxl_unmap_afu_irq(cfg->mcctx, 2, afu); | |
783 | case UNMAP_ONE: | |
784 | cxl_unmap_afu_irq(cfg->mcctx, 1, afu); | |
785 | case FREE_IRQ: | |
786 | cxl_free_afu_irqs(cfg->mcctx); | |
787 | case RELEASE_CONTEXT: | |
788 | cfg->mcctx = NULL; | |
789 | } | |
790 | } | |
791 | ||
792 | /** | |
793 | * term_afu() - terminates the AFU | |
794 | * @cxlflash: Internal structure associated with the host. | |
795 | * | |
796 | * Safe to call with AFU/MC in partially allocated/initialized state. | |
797 | */ | |
798 | static void term_afu(struct cxlflash_cfg *cfg) | |
799 | { | |
800 | term_mc(cfg, UNDO_START); | |
801 | ||
802 | if (cfg->afu) | |
803 | stop_afu(cfg); | |
804 | ||
805 | pr_debug("%s: returning\n", __func__); | |
806 | } | |
807 | ||
808 | /** | |
809 | * cxlflash_remove() - PCI entry point to tear down host | |
810 | * @pdev: PCI device associated with the host. | |
811 | * | |
812 | * Safe to use as a cleanup in partially allocated/initialized state. | |
813 | */ | |
814 | static void cxlflash_remove(struct pci_dev *pdev) | |
815 | { | |
816 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); | |
817 | ulong lock_flags; | |
818 | ||
819 | /* If a Task Management Function is active, wait for it to complete | |
820 | * before continuing with remove. | |
821 | */ | |
822 | spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags); | |
823 | if (cfg->tmf_active) | |
824 | wait_event_interruptible_locked_irq(cfg->tmf_waitq, | |
825 | !cfg->tmf_active); | |
826 | spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags); | |
827 | ||
828 | switch (cfg->init_state) { | |
829 | case INIT_STATE_SCSI: | |
830 | scsi_remove_host(cfg->host); | |
831 | scsi_host_put(cfg->host); | |
832 | /* Fall through */ | |
833 | case INIT_STATE_AFU: | |
834 | term_afu(cfg); | |
835 | case INIT_STATE_PCI: | |
836 | pci_release_regions(cfg->dev); | |
837 | pci_disable_device(pdev); | |
838 | case INIT_STATE_NONE: | |
839 | flush_work(&cfg->work_q); | |
840 | free_mem(cfg); | |
841 | break; | |
842 | } | |
843 | ||
844 | pr_debug("%s: returning\n", __func__); | |
845 | } | |
846 | ||
847 | /** | |
848 | * alloc_mem() - allocates the AFU and its command pool | |
849 | * @cxlflash: Internal structure associated with the host. | |
850 | * | |
851 | * A partially allocated state remains on failure. | |
852 | * | |
853 | * Return: | |
854 | * 0 on success | |
855 | * -ENOMEM on failure to allocate memory | |
856 | */ | |
857 | static int alloc_mem(struct cxlflash_cfg *cfg) | |
858 | { | |
859 | int rc = 0; | |
860 | int i; | |
861 | char *buf = NULL; | |
862 | ||
863 | /* This allocation is about 12K, i.e. only 1 64k page | |
864 | * and upto 4 4k pages | |
865 | */ | |
866 | cfg->afu = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, | |
867 | get_order(sizeof(struct afu))); | |
868 | if (unlikely(!cfg->afu)) { | |
869 | pr_err("%s: cannot get %d free pages\n", | |
870 | __func__, get_order(sizeof(struct afu))); | |
871 | rc = -ENOMEM; | |
872 | goto out; | |
873 | } | |
874 | cfg->afu->parent = cfg; | |
875 | cfg->afu->afu_map = NULL; | |
876 | ||
877 | for (i = 0; i < CXLFLASH_NUM_CMDS; buf += CMD_BUFSIZE, i++) { | |
878 | if (!((u64)buf & (PAGE_SIZE - 1))) { | |
879 | buf = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO); | |
880 | if (unlikely(!buf)) { | |
881 | pr_err("%s: Allocate command buffers fail!\n", | |
882 | __func__); | |
883 | rc = -ENOMEM; | |
884 | free_mem(cfg); | |
885 | goto out; | |
886 | } | |
887 | } | |
888 | ||
889 | cfg->afu->cmd[i].buf = buf; | |
890 | atomic_set(&cfg->afu->cmd[i].free, 1); | |
891 | cfg->afu->cmd[i].slot = i; | |
892 | } | |
893 | ||
894 | out: | |
895 | return rc; | |
896 | } | |
897 | ||
898 | /** | |
899 | * init_pci() - initializes the host as a PCI device | |
900 | * @cxlflash: Internal structure associated with the host. | |
901 | * | |
902 | * Return: | |
903 | * 0 on success | |
904 | * -EIO on unable to communicate with device | |
905 | * A return code from the PCI sub-routines | |
906 | */ | |
907 | static int init_pci(struct cxlflash_cfg *cfg) | |
908 | { | |
909 | struct pci_dev *pdev = cfg->dev; | |
910 | int rc = 0; | |
911 | ||
912 | cfg->cxlflash_regs_pci = pci_resource_start(pdev, 0); | |
913 | rc = pci_request_regions(pdev, CXLFLASH_NAME); | |
914 | if (rc < 0) { | |
915 | dev_err(&pdev->dev, | |
916 | "%s: Couldn't register memory range of registers\n", | |
917 | __func__); | |
918 | goto out; | |
919 | } | |
920 | ||
921 | rc = pci_enable_device(pdev); | |
922 | if (rc || pci_channel_offline(pdev)) { | |
923 | if (pci_channel_offline(pdev)) { | |
924 | cxlflash_wait_for_pci_err_recovery(cfg); | |
925 | rc = pci_enable_device(pdev); | |
926 | } | |
927 | ||
928 | if (rc) { | |
929 | dev_err(&pdev->dev, "%s: Cannot enable adapter\n", | |
930 | __func__); | |
931 | cxlflash_wait_for_pci_err_recovery(cfg); | |
932 | goto out_release_regions; | |
933 | } | |
934 | } | |
935 | ||
936 | rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); | |
937 | if (rc < 0) { | |
938 | dev_dbg(&pdev->dev, "%s: Failed to set 64 bit PCI DMA mask\n", | |
939 | __func__); | |
940 | rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); | |
941 | } | |
942 | ||
943 | if (rc < 0) { | |
944 | dev_err(&pdev->dev, "%s: Failed to set PCI DMA mask\n", | |
945 | __func__); | |
946 | goto out_disable; | |
947 | } | |
948 | ||
949 | pci_set_master(pdev); | |
950 | ||
951 | if (pci_channel_offline(pdev)) { | |
952 | cxlflash_wait_for_pci_err_recovery(cfg); | |
953 | if (pci_channel_offline(pdev)) { | |
954 | rc = -EIO; | |
955 | goto out_msi_disable; | |
956 | } | |
957 | } | |
958 | ||
959 | rc = pci_save_state(pdev); | |
960 | ||
961 | if (rc != PCIBIOS_SUCCESSFUL) { | |
962 | dev_err(&pdev->dev, "%s: Failed to save PCI config space\n", | |
963 | __func__); | |
964 | rc = -EIO; | |
965 | goto cleanup_nolog; | |
966 | } | |
967 | ||
968 | out: | |
969 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
970 | return rc; | |
971 | ||
972 | cleanup_nolog: | |
973 | out_msi_disable: | |
974 | cxlflash_wait_for_pci_err_recovery(cfg); | |
975 | out_disable: | |
976 | pci_disable_device(pdev); | |
977 | out_release_regions: | |
978 | pci_release_regions(pdev); | |
979 | goto out; | |
980 | ||
981 | } | |
982 | ||
983 | /** | |
984 | * init_scsi() - adds the host to the SCSI stack and kicks off host scan | |
985 | * @cxlflash: Internal structure associated with the host. | |
986 | * | |
987 | * Return: | |
988 | * 0 on success | |
989 | * A return code from adding the host | |
990 | */ | |
991 | static int init_scsi(struct cxlflash_cfg *cfg) | |
992 | { | |
993 | struct pci_dev *pdev = cfg->dev; | |
994 | int rc = 0; | |
995 | ||
996 | rc = scsi_add_host(cfg->host, &pdev->dev); | |
997 | if (rc) { | |
998 | dev_err(&pdev->dev, "%s: scsi_add_host failed (rc=%d)\n", | |
999 | __func__, rc); | |
1000 | goto out; | |
1001 | } | |
1002 | ||
1003 | scsi_scan_host(cfg->host); | |
1004 | ||
1005 | out: | |
1006 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1007 | return rc; | |
1008 | } | |
1009 | ||
1010 | /** | |
1011 | * set_port_online() - transitions the specified host FC port to online state | |
1012 | * @fc_regs: Top of MMIO region defined for specified port. | |
1013 | * | |
1014 | * The provided MMIO region must be mapped prior to call. Online state means | |
1015 | * that the FC link layer has synced, completed the handshaking process, and | |
1016 | * is ready for login to start. | |
1017 | */ | |
1018 | static void set_port_online(u64 *fc_regs) | |
1019 | { | |
1020 | u64 cmdcfg; | |
1021 | ||
1022 | cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
1023 | cmdcfg &= (~FC_MTIP_CMDCONFIG_OFFLINE); /* clear OFF_LINE */ | |
1024 | cmdcfg |= (FC_MTIP_CMDCONFIG_ONLINE); /* set ON_LINE */ | |
1025 | writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
1026 | } | |
1027 | ||
1028 | /** | |
1029 | * set_port_offline() - transitions the specified host FC port to offline state | |
1030 | * @fc_regs: Top of MMIO region defined for specified port. | |
1031 | * | |
1032 | * The provided MMIO region must be mapped prior to call. | |
1033 | */ | |
1034 | static void set_port_offline(u64 *fc_regs) | |
1035 | { | |
1036 | u64 cmdcfg; | |
1037 | ||
1038 | cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
1039 | cmdcfg &= (~FC_MTIP_CMDCONFIG_ONLINE); /* clear ON_LINE */ | |
1040 | cmdcfg |= (FC_MTIP_CMDCONFIG_OFFLINE); /* set OFF_LINE */ | |
1041 | writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
1042 | } | |
1043 | ||
1044 | /** | |
1045 | * wait_port_online() - waits for the specified host FC port come online | |
1046 | * @fc_regs: Top of MMIO region defined for specified port. | |
1047 | * @delay_us: Number of microseconds to delay between reading port status. | |
1048 | * @nretry: Number of cycles to retry reading port status. | |
1049 | * | |
1050 | * The provided MMIO region must be mapped prior to call. This will timeout | |
1051 | * when the cable is not plugged in. | |
1052 | * | |
1053 | * Return: | |
1054 | * TRUE (1) when the specified port is online | |
1055 | * FALSE (0) when the specified port fails to come online after timeout | |
1056 | * -EINVAL when @delay_us is less than 1000 | |
1057 | */ | |
1058 | static int wait_port_online(u64 *fc_regs, u32 delay_us, u32 nretry) | |
1059 | { | |
1060 | u64 status; | |
1061 | ||
1062 | if (delay_us < 1000) { | |
1063 | pr_err("%s: invalid delay specified %d\n", __func__, delay_us); | |
1064 | return -EINVAL; | |
1065 | } | |
1066 | ||
1067 | do { | |
1068 | msleep(delay_us / 1000); | |
1069 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); | |
1070 | } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_ONLINE && | |
1071 | nretry--); | |
1072 | ||
1073 | return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_ONLINE); | |
1074 | } | |
1075 | ||
1076 | /** | |
1077 | * wait_port_offline() - waits for the specified host FC port go offline | |
1078 | * @fc_regs: Top of MMIO region defined for specified port. | |
1079 | * @delay_us: Number of microseconds to delay between reading port status. | |
1080 | * @nretry: Number of cycles to retry reading port status. | |
1081 | * | |
1082 | * The provided MMIO region must be mapped prior to call. | |
1083 | * | |
1084 | * Return: | |
1085 | * TRUE (1) when the specified port is offline | |
1086 | * FALSE (0) when the specified port fails to go offline after timeout | |
1087 | * -EINVAL when @delay_us is less than 1000 | |
1088 | */ | |
1089 | static int wait_port_offline(u64 *fc_regs, u32 delay_us, u32 nretry) | |
1090 | { | |
1091 | u64 status; | |
1092 | ||
1093 | if (delay_us < 1000) { | |
1094 | pr_err("%s: invalid delay specified %d\n", __func__, delay_us); | |
1095 | return -EINVAL; | |
1096 | } | |
1097 | ||
1098 | do { | |
1099 | msleep(delay_us / 1000); | |
1100 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); | |
1101 | } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_OFFLINE && | |
1102 | nretry--); | |
1103 | ||
1104 | return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_OFFLINE); | |
1105 | } | |
1106 | ||
1107 | /** | |
1108 | * afu_set_wwpn() - configures the WWPN for the specified host FC port | |
1109 | * @afu: AFU associated with the host that owns the specified FC port. | |
1110 | * @port: Port number being configured. | |
1111 | * @fc_regs: Top of MMIO region defined for specified port. | |
1112 | * @wwpn: The world-wide-port-number previously discovered for port. | |
1113 | * | |
1114 | * The provided MMIO region must be mapped prior to call. As part of the | |
1115 | * sequence to configure the WWPN, the port is toggled offline and then back | |
1116 | * online. This toggling action can cause this routine to delay up to a few | |
1117 | * seconds. When configured to use the internal LUN feature of the AFU, a | |
1118 | * failure to come online is overridden. | |
1119 | * | |
1120 | * Return: | |
1121 | * 0 when the WWPN is successfully written and the port comes back online | |
1122 | * -1 when the port fails to go offline or come back up online | |
1123 | */ | |
1124 | static int afu_set_wwpn(struct afu *afu, int port, u64 *fc_regs, u64 wwpn) | |
1125 | { | |
1126 | int ret = 0; | |
1127 | ||
1128 | set_port_offline(fc_regs); | |
1129 | ||
1130 | if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
1131 | FC_PORT_STATUS_RETRY_CNT)) { | |
1132 | pr_debug("%s: wait on port %d to go offline timed out\n", | |
1133 | __func__, port); | |
1134 | ret = -1; /* but continue on to leave the port back online */ | |
1135 | } | |
1136 | ||
1137 | if (ret == 0) | |
1138 | writeq_be(wwpn, &fc_regs[FC_PNAME / 8]); | |
1139 | ||
1140 | set_port_online(fc_regs); | |
1141 | ||
1142 | if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
1143 | FC_PORT_STATUS_RETRY_CNT)) { | |
1144 | pr_debug("%s: wait on port %d to go online timed out\n", | |
1145 | __func__, port); | |
1146 | ret = -1; | |
1147 | ||
1148 | /* | |
1149 | * Override for internal lun!!! | |
1150 | */ | |
1151 | if (afu->internal_lun) { | |
1152 | pr_debug("%s: Overriding port %d online timeout!!!\n", | |
1153 | __func__, port); | |
1154 | ret = 0; | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | pr_debug("%s: returning rc=%d\n", __func__, ret); | |
1159 | ||
1160 | return ret; | |
1161 | } | |
1162 | ||
1163 | /** | |
1164 | * afu_link_reset() - resets the specified host FC port | |
1165 | * @afu: AFU associated with the host that owns the specified FC port. | |
1166 | * @port: Port number being configured. | |
1167 | * @fc_regs: Top of MMIO region defined for specified port. | |
1168 | * | |
1169 | * The provided MMIO region must be mapped prior to call. The sequence to | |
1170 | * reset the port involves toggling it offline and then back online. This | |
1171 | * action can cause this routine to delay up to a few seconds. An effort | |
1172 | * is made to maintain link with the device by switching to host to use | |
1173 | * the alternate port exclusively while the reset takes place. | |
1174 | * failure to come online is overridden. | |
1175 | */ | |
1176 | static void afu_link_reset(struct afu *afu, int port, u64 *fc_regs) | |
1177 | { | |
1178 | u64 port_sel; | |
1179 | ||
1180 | /* first switch the AFU to the other links, if any */ | |
1181 | port_sel = readq_be(&afu->afu_map->global.regs.afu_port_sel); | |
1182 | port_sel &= ~(1 << port); | |
1183 | writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); | |
1184 | cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); | |
1185 | ||
1186 | set_port_offline(fc_regs); | |
1187 | if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
1188 | FC_PORT_STATUS_RETRY_CNT)) | |
1189 | pr_err("%s: wait on port %d to go offline timed out\n", | |
1190 | __func__, port); | |
1191 | ||
1192 | set_port_online(fc_regs); | |
1193 | if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
1194 | FC_PORT_STATUS_RETRY_CNT)) | |
1195 | pr_err("%s: wait on port %d to go online timed out\n", | |
1196 | __func__, port); | |
1197 | ||
1198 | /* switch back to include this port */ | |
1199 | port_sel |= (1 << port); | |
1200 | writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); | |
1201 | cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); | |
1202 | ||
1203 | pr_debug("%s: returning port_sel=%lld\n", __func__, port_sel); | |
1204 | } | |
1205 | ||
1206 | /* | |
1207 | * Asynchronous interrupt information table | |
1208 | */ | |
1209 | static const struct asyc_intr_info ainfo[] = { | |
1210 | {SISL_ASTATUS_FC0_OTHER, "other error", 0, CLR_FC_ERROR | LINK_RESET}, | |
1211 | {SISL_ASTATUS_FC0_LOGO, "target initiated LOGO", 0, 0}, | |
1212 | {SISL_ASTATUS_FC0_CRC_T, "CRC threshold exceeded", 0, LINK_RESET}, | |
1213 | {SISL_ASTATUS_FC0_LOGI_R, "login timed out, retrying", 0, 0}, | |
1214 | {SISL_ASTATUS_FC0_LOGI_F, "login failed", 0, CLR_FC_ERROR}, | |
1215 | {SISL_ASTATUS_FC0_LOGI_S, "login succeeded", 0, 0}, | |
1216 | {SISL_ASTATUS_FC0_LINK_DN, "link down", 0, 0}, | |
1217 | {SISL_ASTATUS_FC0_LINK_UP, "link up", 0, 0}, | |
1218 | {SISL_ASTATUS_FC1_OTHER, "other error", 1, CLR_FC_ERROR | LINK_RESET}, | |
1219 | {SISL_ASTATUS_FC1_LOGO, "target initiated LOGO", 1, 0}, | |
1220 | {SISL_ASTATUS_FC1_CRC_T, "CRC threshold exceeded", 1, LINK_RESET}, | |
1221 | {SISL_ASTATUS_FC1_LOGI_R, "login timed out, retrying", 1, 0}, | |
1222 | {SISL_ASTATUS_FC1_LOGI_F, "login failed", 1, CLR_FC_ERROR}, | |
1223 | {SISL_ASTATUS_FC1_LOGI_S, "login succeeded", 1, 0}, | |
1224 | {SISL_ASTATUS_FC1_LINK_DN, "link down", 1, 0}, | |
1225 | {SISL_ASTATUS_FC1_LINK_UP, "link up", 1, 0}, | |
1226 | {0x0, "", 0, 0} /* terminator */ | |
1227 | }; | |
1228 | ||
1229 | /** | |
1230 | * find_ainfo() - locates and returns asynchronous interrupt information | |
1231 | * @status: Status code set by AFU on error. | |
1232 | * | |
1233 | * Return: The located information or NULL when the status code is invalid. | |
1234 | */ | |
1235 | static const struct asyc_intr_info *find_ainfo(u64 status) | |
1236 | { | |
1237 | const struct asyc_intr_info *info; | |
1238 | ||
1239 | for (info = &ainfo[0]; info->status; info++) | |
1240 | if (info->status == status) | |
1241 | return info; | |
1242 | ||
1243 | return NULL; | |
1244 | } | |
1245 | ||
1246 | /** | |
1247 | * afu_err_intr_init() - clears and initializes the AFU for error interrupts | |
1248 | * @afu: AFU associated with the host. | |
1249 | */ | |
1250 | static void afu_err_intr_init(struct afu *afu) | |
1251 | { | |
1252 | int i; | |
1253 | u64 reg; | |
1254 | ||
1255 | /* global async interrupts: AFU clears afu_ctrl on context exit | |
1256 | * if async interrupts were sent to that context. This prevents | |
1257 | * the AFU form sending further async interrupts when | |
1258 | * there is | |
1259 | * nobody to receive them. | |
1260 | */ | |
1261 | ||
1262 | /* mask all */ | |
1263 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_mask); | |
1264 | /* set LISN# to send and point to master context */ | |
1265 | reg = ((u64) (((afu->ctx_hndl << 8) | SISL_MSI_ASYNC_ERROR)) << 40); | |
1266 | ||
1267 | if (afu->internal_lun) | |
1268 | reg |= 1; /* Bit 63 indicates local lun */ | |
1269 | writeq_be(reg, &afu->afu_map->global.regs.afu_ctrl); | |
1270 | /* clear all */ | |
1271 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); | |
1272 | /* unmask bits that are of interest */ | |
1273 | /* note: afu can send an interrupt after this step */ | |
1274 | writeq_be(SISL_ASTATUS_MASK, &afu->afu_map->global.regs.aintr_mask); | |
1275 | /* clear again in case a bit came on after previous clear but before */ | |
1276 | /* unmask */ | |
1277 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); | |
1278 | ||
1279 | /* Clear/Set internal lun bits */ | |
1280 | reg = readq_be(&afu->afu_map->global.fc_regs[0][FC_CONFIG2 / 8]); | |
1281 | reg &= SISL_FC_INTERNAL_MASK; | |
1282 | if (afu->internal_lun) | |
1283 | reg |= ((u64)(afu->internal_lun - 1) << SISL_FC_INTERNAL_SHIFT); | |
1284 | writeq_be(reg, &afu->afu_map->global.fc_regs[0][FC_CONFIG2 / 8]); | |
1285 | ||
1286 | /* now clear FC errors */ | |
1287 | for (i = 0; i < NUM_FC_PORTS; i++) { | |
1288 | writeq_be(0xFFFFFFFFU, | |
1289 | &afu->afu_map->global.fc_regs[i][FC_ERROR / 8]); | |
1290 | writeq_be(0, &afu->afu_map->global.fc_regs[i][FC_ERRCAP / 8]); | |
1291 | } | |
1292 | ||
1293 | /* sync interrupts for master's IOARRIN write */ | |
1294 | /* note that unlike asyncs, there can be no pending sync interrupts */ | |
1295 | /* at this time (this is a fresh context and master has not written */ | |
1296 | /* IOARRIN yet), so there is nothing to clear. */ | |
1297 | ||
1298 | /* set LISN#, it is always sent to the context that wrote IOARRIN */ | |
1299 | writeq_be(SISL_MSI_SYNC_ERROR, &afu->host_map->ctx_ctrl); | |
1300 | writeq_be(SISL_ISTATUS_MASK, &afu->host_map->intr_mask); | |
1301 | } | |
1302 | ||
1303 | /** | |
1304 | * cxlflash_sync_err_irq() - interrupt handler for synchronous errors | |
1305 | * @irq: Interrupt number. | |
1306 | * @data: Private data provided at interrupt registration, the AFU. | |
1307 | * | |
1308 | * Return: Always return IRQ_HANDLED. | |
1309 | */ | |
1310 | static irqreturn_t cxlflash_sync_err_irq(int irq, void *data) | |
1311 | { | |
1312 | struct afu *afu = (struct afu *)data; | |
1313 | u64 reg; | |
1314 | u64 reg_unmasked; | |
1315 | ||
1316 | reg = readq_be(&afu->host_map->intr_status); | |
1317 | reg_unmasked = (reg & SISL_ISTATUS_UNMASK); | |
1318 | ||
1319 | if (reg_unmasked == 0UL) { | |
1320 | pr_err("%s: %llX: spurious interrupt, intr_status %016llX\n", | |
1321 | __func__, (u64)afu, reg); | |
1322 | goto cxlflash_sync_err_irq_exit; | |
1323 | } | |
1324 | ||
1325 | pr_err("%s: %llX: unexpected interrupt, intr_status %016llX\n", | |
1326 | __func__, (u64)afu, reg); | |
1327 | ||
1328 | writeq_be(reg_unmasked, &afu->host_map->intr_clear); | |
1329 | ||
1330 | cxlflash_sync_err_irq_exit: | |
1331 | pr_debug("%s: returning rc=%d\n", __func__, IRQ_HANDLED); | |
1332 | return IRQ_HANDLED; | |
1333 | } | |
1334 | ||
1335 | /** | |
1336 | * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path) | |
1337 | * @irq: Interrupt number. | |
1338 | * @data: Private data provided at interrupt registration, the AFU. | |
1339 | * | |
1340 | * Return: Always return IRQ_HANDLED. | |
1341 | */ | |
1342 | static irqreturn_t cxlflash_rrq_irq(int irq, void *data) | |
1343 | { | |
1344 | struct afu *afu = (struct afu *)data; | |
1345 | struct afu_cmd *cmd; | |
1346 | bool toggle = afu->toggle; | |
1347 | u64 entry, | |
1348 | *hrrq_start = afu->hrrq_start, | |
1349 | *hrrq_end = afu->hrrq_end, | |
1350 | *hrrq_curr = afu->hrrq_curr; | |
1351 | ||
1352 | /* Process however many RRQ entries that are ready */ | |
1353 | while (true) { | |
1354 | entry = *hrrq_curr; | |
1355 | ||
1356 | if ((entry & SISL_RESP_HANDLE_T_BIT) != toggle) | |
1357 | break; | |
1358 | ||
1359 | cmd = (struct afu_cmd *)(entry & ~SISL_RESP_HANDLE_T_BIT); | |
1360 | cmd_complete(cmd); | |
1361 | ||
1362 | /* Advance to next entry or wrap and flip the toggle bit */ | |
1363 | if (hrrq_curr < hrrq_end) | |
1364 | hrrq_curr++; | |
1365 | else { | |
1366 | hrrq_curr = hrrq_start; | |
1367 | toggle ^= SISL_RESP_HANDLE_T_BIT; | |
1368 | } | |
1369 | } | |
1370 | ||
1371 | afu->hrrq_curr = hrrq_curr; | |
1372 | afu->toggle = toggle; | |
1373 | ||
1374 | return IRQ_HANDLED; | |
1375 | } | |
1376 | ||
1377 | /** | |
1378 | * cxlflash_async_err_irq() - interrupt handler for asynchronous errors | |
1379 | * @irq: Interrupt number. | |
1380 | * @data: Private data provided at interrupt registration, the AFU. | |
1381 | * | |
1382 | * Return: Always return IRQ_HANDLED. | |
1383 | */ | |
1384 | static irqreturn_t cxlflash_async_err_irq(int irq, void *data) | |
1385 | { | |
1386 | struct afu *afu = (struct afu *)data; | |
1387 | struct cxlflash_cfg *cfg; | |
1388 | u64 reg_unmasked; | |
1389 | const struct asyc_intr_info *info; | |
1390 | struct sisl_global_map *global = &afu->afu_map->global; | |
1391 | u64 reg; | |
1392 | u8 port; | |
1393 | int i; | |
1394 | ||
1395 | cfg = afu->parent; | |
1396 | ||
1397 | reg = readq_be(&global->regs.aintr_status); | |
1398 | reg_unmasked = (reg & SISL_ASTATUS_UNMASK); | |
1399 | ||
1400 | if (reg_unmasked == 0) { | |
1401 | pr_err("%s: spurious interrupt, aintr_status 0x%016llX\n", | |
1402 | __func__, reg); | |
1403 | goto out; | |
1404 | } | |
1405 | ||
1406 | /* it is OK to clear AFU status before FC_ERROR */ | |
1407 | writeq_be(reg_unmasked, &global->regs.aintr_clear); | |
1408 | ||
1409 | /* check each bit that is on */ | |
1410 | for (i = 0; reg_unmasked; i++, reg_unmasked = (reg_unmasked >> 1)) { | |
1411 | info = find_ainfo(1ULL << i); | |
1412 | if ((reg_unmasked & 0x1) || !info) | |
1413 | continue; | |
1414 | ||
1415 | port = info->port; | |
1416 | ||
1417 | pr_err("%s: FC Port %d -> %s, fc_status 0x%08llX\n", | |
1418 | __func__, port, info->desc, | |
1419 | readq_be(&global->fc_regs[port][FC_STATUS / 8])); | |
1420 | ||
1421 | /* | |
1422 | * do link reset first, some OTHER errors will set FC_ERROR | |
1423 | * again if cleared before or w/o a reset | |
1424 | */ | |
1425 | if (info->action & LINK_RESET) { | |
1426 | pr_err("%s: FC Port %d: resetting link\n", | |
1427 | __func__, port); | |
1428 | cfg->lr_state = LINK_RESET_REQUIRED; | |
1429 | cfg->lr_port = port; | |
1430 | schedule_work(&cfg->work_q); | |
1431 | } | |
1432 | ||
1433 | if (info->action & CLR_FC_ERROR) { | |
1434 | reg = readq_be(&global->fc_regs[port][FC_ERROR / 8]); | |
1435 | ||
1436 | /* | |
1437 | * since all errors are unmasked, FC_ERROR and FC_ERRCAP | |
1438 | * should be the same and tracing one is sufficient. | |
1439 | */ | |
1440 | ||
1441 | pr_err("%s: fc %d: clearing fc_error 0x%08llX\n", | |
1442 | __func__, port, reg); | |
1443 | ||
1444 | writeq_be(reg, &global->fc_regs[port][FC_ERROR / 8]); | |
1445 | writeq_be(0, &global->fc_regs[port][FC_ERRCAP / 8]); | |
1446 | } | |
1447 | } | |
1448 | ||
1449 | out: | |
1450 | pr_debug("%s: returning rc=%d, afu=%p\n", __func__, IRQ_HANDLED, afu); | |
1451 | return IRQ_HANDLED; | |
1452 | } | |
1453 | ||
1454 | /** | |
1455 | * start_context() - starts the master context | |
1456 | * @cxlflash: Internal structure associated with the host. | |
1457 | * | |
1458 | * Return: A success or failure value from CXL services. | |
1459 | */ | |
1460 | static int start_context(struct cxlflash_cfg *cfg) | |
1461 | { | |
1462 | int rc = 0; | |
1463 | ||
1464 | rc = cxl_start_context(cfg->mcctx, | |
1465 | cfg->afu->work.work_element_descriptor, | |
1466 | NULL); | |
1467 | ||
1468 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1469 | return rc; | |
1470 | } | |
1471 | ||
1472 | /** | |
1473 | * read_vpd() - obtains the WWPNs from VPD | |
1474 | * @cxlflash: Internal structure associated with the host. | |
1475 | * @wwpn: Array of size NUM_FC_PORTS to pass back WWPNs | |
1476 | * | |
1477 | * Return: | |
1478 | * 0 on success | |
1479 | * -ENODEV when VPD or WWPN keywords not found | |
1480 | */ | |
1481 | static int read_vpd(struct cxlflash_cfg *cfg, u64 wwpn[]) | |
1482 | { | |
1483 | struct pci_dev *dev = cfg->parent_dev; | |
1484 | int rc = 0; | |
1485 | int ro_start, ro_size, i, j, k; | |
1486 | ssize_t vpd_size; | |
1487 | char vpd_data[CXLFLASH_VPD_LEN]; | |
1488 | char tmp_buf[WWPN_BUF_LEN] = { 0 }; | |
1489 | char *wwpn_vpd_tags[NUM_FC_PORTS] = { "V5", "V6" }; | |
1490 | ||
1491 | /* Get the VPD data from the device */ | |
1492 | vpd_size = pci_read_vpd(dev, 0, sizeof(vpd_data), vpd_data); | |
1493 | if (unlikely(vpd_size <= 0)) { | |
1494 | pr_err("%s: Unable to read VPD (size = %ld)\n", | |
1495 | __func__, vpd_size); | |
1496 | rc = -ENODEV; | |
1497 | goto out; | |
1498 | } | |
1499 | ||
1500 | /* Get the read only section offset */ | |
1501 | ro_start = pci_vpd_find_tag(vpd_data, 0, vpd_size, | |
1502 | PCI_VPD_LRDT_RO_DATA); | |
1503 | if (unlikely(ro_start < 0)) { | |
1504 | pr_err("%s: VPD Read-only data not found\n", __func__); | |
1505 | rc = -ENODEV; | |
1506 | goto out; | |
1507 | } | |
1508 | ||
1509 | /* Get the read only section size, cap when extends beyond read VPD */ | |
1510 | ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]); | |
1511 | j = ro_size; | |
1512 | i = ro_start + PCI_VPD_LRDT_TAG_SIZE; | |
1513 | if (unlikely((i + j) > vpd_size)) { | |
1514 | pr_debug("%s: Might need to read more VPD (%d > %ld)\n", | |
1515 | __func__, (i + j), vpd_size); | |
1516 | ro_size = vpd_size - i; | |
1517 | } | |
1518 | ||
1519 | /* | |
1520 | * Find the offset of the WWPN tag within the read only | |
1521 | * VPD data and validate the found field (partials are | |
1522 | * no good to us). Convert the ASCII data to an integer | |
1523 | * value. Note that we must copy to a temporary buffer | |
1524 | * because the conversion service requires that the ASCII | |
1525 | * string be terminated. | |
1526 | */ | |
1527 | for (k = 0; k < NUM_FC_PORTS; k++) { | |
1528 | j = ro_size; | |
1529 | i = ro_start + PCI_VPD_LRDT_TAG_SIZE; | |
1530 | ||
1531 | i = pci_vpd_find_info_keyword(vpd_data, i, j, wwpn_vpd_tags[k]); | |
1532 | if (unlikely(i < 0)) { | |
1533 | pr_err("%s: Port %d WWPN not found in VPD\n", | |
1534 | __func__, k); | |
1535 | rc = -ENODEV; | |
1536 | goto out; | |
1537 | } | |
1538 | ||
1539 | j = pci_vpd_info_field_size(&vpd_data[i]); | |
1540 | i += PCI_VPD_INFO_FLD_HDR_SIZE; | |
1541 | if (unlikely((i + j > vpd_size) || (j != WWPN_LEN))) { | |
1542 | pr_err("%s: Port %d WWPN incomplete or VPD corrupt\n", | |
1543 | __func__, k); | |
1544 | rc = -ENODEV; | |
1545 | goto out; | |
1546 | } | |
1547 | ||
1548 | memcpy(tmp_buf, &vpd_data[i], WWPN_LEN); | |
1549 | rc = kstrtoul(tmp_buf, WWPN_LEN, (ulong *)&wwpn[k]); | |
1550 | if (unlikely(rc)) { | |
1551 | pr_err("%s: Fail to convert port %d WWPN to integer\n", | |
1552 | __func__, k); | |
1553 | rc = -ENODEV; | |
1554 | goto out; | |
1555 | } | |
1556 | } | |
1557 | ||
1558 | out: | |
1559 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1560 | return rc; | |
1561 | } | |
1562 | ||
1563 | /** | |
1564 | * cxlflash_context_reset() - timeout handler for AFU commands | |
1565 | * @cmd: AFU command that timed out. | |
1566 | * | |
1567 | * Sends a reset to the AFU. | |
1568 | */ | |
1569 | void cxlflash_context_reset(struct afu_cmd *cmd) | |
1570 | { | |
1571 | int nretry = 0; | |
1572 | u64 rrin = 0x1; | |
1573 | u64 room = 0; | |
1574 | struct afu *afu = cmd->parent; | |
1575 | ulong lock_flags; | |
1576 | ||
1577 | pr_debug("%s: cmd=%p\n", __func__, cmd); | |
1578 | ||
1579 | spin_lock_irqsave(&cmd->slock, lock_flags); | |
1580 | ||
1581 | /* Already completed? */ | |
1582 | if (cmd->sa.host_use_b[0] & B_DONE) { | |
1583 | spin_unlock_irqrestore(&cmd->slock, lock_flags); | |
1584 | return; | |
1585 | } | |
1586 | ||
1587 | cmd->sa.host_use_b[0] |= (B_DONE | B_ERROR | B_TIMEOUT); | |
1588 | spin_unlock_irqrestore(&cmd->slock, lock_flags); | |
1589 | ||
1590 | /* | |
1591 | * We really want to send this reset at all costs, so spread | |
1592 | * out wait time on successive retries for available room. | |
1593 | */ | |
1594 | do { | |
1595 | room = readq_be(&afu->host_map->cmd_room); | |
1596 | atomic64_set(&afu->room, room); | |
1597 | if (room) | |
1598 | goto write_rrin; | |
1599 | udelay(nretry); | |
1600 | } while (nretry++ < MC_ROOM_RETRY_CNT); | |
1601 | ||
1602 | pr_err("%s: no cmd_room to send reset\n", __func__); | |
1603 | return; | |
1604 | ||
1605 | write_rrin: | |
1606 | nretry = 0; | |
1607 | writeq_be(rrin, &afu->host_map->ioarrin); | |
1608 | do { | |
1609 | rrin = readq_be(&afu->host_map->ioarrin); | |
1610 | if (rrin != 0x1) | |
1611 | break; | |
1612 | /* Double delay each time */ | |
1613 | udelay(2 ^ nretry); | |
1614 | } while (nretry++ < MC_ROOM_RETRY_CNT); | |
1615 | } | |
1616 | ||
1617 | /** | |
1618 | * init_pcr() - initialize the provisioning and control registers | |
1619 | * @cxlflash: Internal structure associated with the host. | |
1620 | * | |
1621 | * Also sets up fast access to the mapped registers and initializes AFU | |
1622 | * command fields that never change. | |
1623 | */ | |
1624 | void init_pcr(struct cxlflash_cfg *cfg) | |
1625 | { | |
1626 | struct afu *afu = cfg->afu; | |
1627 | struct sisl_ctrl_map *ctrl_map; | |
1628 | int i; | |
1629 | ||
1630 | for (i = 0; i < MAX_CONTEXT; i++) { | |
1631 | ctrl_map = &afu->afu_map->ctrls[i].ctrl; | |
1632 | /* disrupt any clients that could be running */ | |
1633 | /* e. g. clients that survived a master restart */ | |
1634 | writeq_be(0, &ctrl_map->rht_start); | |
1635 | writeq_be(0, &ctrl_map->rht_cnt_id); | |
1636 | writeq_be(0, &ctrl_map->ctx_cap); | |
1637 | } | |
1638 | ||
1639 | /* copy frequently used fields into afu */ | |
1640 | afu->ctx_hndl = (u16) cxl_process_element(cfg->mcctx); | |
1641 | /* ctx_hndl is 16 bits in CAIA */ | |
1642 | afu->host_map = &afu->afu_map->hosts[afu->ctx_hndl].host; | |
1643 | afu->ctrl_map = &afu->afu_map->ctrls[afu->ctx_hndl].ctrl; | |
1644 | ||
1645 | /* Program the Endian Control for the master context */ | |
1646 | writeq_be(SISL_ENDIAN_CTRL, &afu->host_map->endian_ctrl); | |
1647 | ||
1648 | /* initialize cmd fields that never change */ | |
1649 | for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { | |
1650 | afu->cmd[i].rcb.ctx_id = afu->ctx_hndl; | |
1651 | afu->cmd[i].rcb.msi = SISL_MSI_RRQ_UPDATED; | |
1652 | afu->cmd[i].rcb.rrq = 0x0; | |
1653 | } | |
1654 | } | |
1655 | ||
1656 | /** | |
1657 | * init_global() - initialize AFU global registers | |
1658 | * @cxlflash: Internal structure associated with the host. | |
1659 | */ | |
1660 | int init_global(struct cxlflash_cfg *cfg) | |
1661 | { | |
1662 | struct afu *afu = cfg->afu; | |
1663 | u64 wwpn[NUM_FC_PORTS]; /* wwpn of AFU ports */ | |
1664 | int i = 0, num_ports = 0; | |
1665 | int rc = 0; | |
1666 | u64 reg; | |
1667 | ||
1668 | rc = read_vpd(cfg, &wwpn[0]); | |
1669 | if (rc) { | |
1670 | pr_err("%s: could not read vpd rc=%d\n", __func__, rc); | |
1671 | goto out; | |
1672 | } | |
1673 | ||
1674 | pr_debug("%s: wwpn0=0x%llX wwpn1=0x%llX\n", __func__, wwpn[0], wwpn[1]); | |
1675 | ||
1676 | /* set up RRQ in AFU for master issued cmds */ | |
1677 | writeq_be((u64) afu->hrrq_start, &afu->host_map->rrq_start); | |
1678 | writeq_be((u64) afu->hrrq_end, &afu->host_map->rrq_end); | |
1679 | ||
1680 | /* AFU configuration */ | |
1681 | reg = readq_be(&afu->afu_map->global.regs.afu_config); | |
1682 | reg |= SISL_AFUCONF_AR_ALL|SISL_AFUCONF_ENDIAN; | |
1683 | /* enable all auto retry options and control endianness */ | |
1684 | /* leave others at default: */ | |
1685 | /* CTX_CAP write protected, mbox_r does not clear on read and */ | |
1686 | /* checker on if dual afu */ | |
1687 | writeq_be(reg, &afu->afu_map->global.regs.afu_config); | |
1688 | ||
1689 | /* global port select: select either port */ | |
1690 | if (afu->internal_lun) { | |
1691 | /* only use port 0 */ | |
1692 | writeq_be(PORT0, &afu->afu_map->global.regs.afu_port_sel); | |
1693 | num_ports = NUM_FC_PORTS - 1; | |
1694 | } else { | |
1695 | writeq_be(BOTH_PORTS, &afu->afu_map->global.regs.afu_port_sel); | |
1696 | num_ports = NUM_FC_PORTS; | |
1697 | } | |
1698 | ||
1699 | for (i = 0; i < num_ports; i++) { | |
1700 | /* unmask all errors (but they are still masked at AFU) */ | |
1701 | writeq_be(0, &afu->afu_map->global.fc_regs[i][FC_ERRMSK / 8]); | |
1702 | /* clear CRC error cnt & set a threshold */ | |
1703 | (void)readq_be(&afu->afu_map->global. | |
1704 | fc_regs[i][FC_CNT_CRCERR / 8]); | |
1705 | writeq_be(MC_CRC_THRESH, &afu->afu_map->global.fc_regs[i] | |
1706 | [FC_CRC_THRESH / 8]); | |
1707 | ||
1708 | /* set WWPNs. If already programmed, wwpn[i] is 0 */ | |
1709 | if (wwpn[i] != 0 && | |
1710 | afu_set_wwpn(afu, i, | |
1711 | &afu->afu_map->global.fc_regs[i][0], | |
1712 | wwpn[i])) { | |
1713 | pr_err("%s: failed to set WWPN on port %d\n", | |
1714 | __func__, i); | |
1715 | rc = -EIO; | |
1716 | goto out; | |
1717 | } | |
1718 | /* Programming WWPN back to back causes additional | |
1719 | * offline/online transitions and a PLOGI | |
1720 | */ | |
1721 | msleep(100); | |
1722 | ||
1723 | } | |
1724 | ||
1725 | /* set up master's own CTX_CAP to allow real mode, host translation */ | |
1726 | /* tbls, afu cmds and read/write GSCSI cmds. */ | |
1727 | /* First, unlock ctx_cap write by reading mbox */ | |
1728 | (void)readq_be(&afu->ctrl_map->mbox_r); /* unlock ctx_cap */ | |
1729 | writeq_be((SISL_CTX_CAP_REAL_MODE | SISL_CTX_CAP_HOST_XLATE | | |
1730 | SISL_CTX_CAP_READ_CMD | SISL_CTX_CAP_WRITE_CMD | | |
1731 | SISL_CTX_CAP_AFU_CMD | SISL_CTX_CAP_GSCSI_CMD), | |
1732 | &afu->ctrl_map->ctx_cap); | |
1733 | /* init heartbeat */ | |
1734 | afu->hb = readq_be(&afu->afu_map->global.regs.afu_hb); | |
1735 | ||
1736 | out: | |
1737 | return rc; | |
1738 | } | |
1739 | ||
1740 | /** | |
1741 | * start_afu() - initializes and starts the AFU | |
1742 | * @cxlflash: Internal structure associated with the host. | |
1743 | */ | |
1744 | static int start_afu(struct cxlflash_cfg *cfg) | |
1745 | { | |
1746 | struct afu *afu = cfg->afu; | |
1747 | struct afu_cmd *cmd; | |
1748 | ||
1749 | int i = 0; | |
1750 | int rc = 0; | |
1751 | ||
1752 | for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { | |
1753 | cmd = &afu->cmd[i]; | |
1754 | ||
1755 | init_completion(&cmd->cevent); | |
1756 | spin_lock_init(&cmd->slock); | |
1757 | cmd->parent = afu; | |
1758 | } | |
1759 | ||
1760 | init_pcr(cfg); | |
1761 | ||
1762 | /* initialize RRQ pointers */ | |
1763 | afu->hrrq_start = &afu->rrq_entry[0]; | |
1764 | afu->hrrq_end = &afu->rrq_entry[NUM_RRQ_ENTRY - 1]; | |
1765 | afu->hrrq_curr = afu->hrrq_start; | |
1766 | afu->toggle = 1; | |
1767 | ||
1768 | rc = init_global(cfg); | |
1769 | ||
1770 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1771 | return rc; | |
1772 | } | |
1773 | ||
1774 | /** | |
1775 | * init_mc() - create and register as the master context | |
1776 | * @cxlflash: Internal structure associated with the host. | |
1777 | * | |
1778 | * Return: | |
1779 | * 0 on success | |
1780 | * -ENOMEM when unable to obtain a context from CXL services | |
1781 | * A failure value from CXL services. | |
1782 | */ | |
1783 | static int init_mc(struct cxlflash_cfg *cfg) | |
1784 | { | |
1785 | struct cxl_context *ctx; | |
1786 | struct device *dev = &cfg->dev->dev; | |
1787 | struct afu *afu = cfg->afu; | |
1788 | int rc = 0; | |
1789 | enum undo_level level; | |
1790 | ||
1791 | ctx = cxl_get_context(cfg->dev); | |
1792 | if (unlikely(!ctx)) | |
1793 | return -ENOMEM; | |
1794 | cfg->mcctx = ctx; | |
1795 | ||
1796 | /* Set it up as a master with the CXL */ | |
1797 | cxl_set_master(ctx); | |
1798 | ||
1799 | /* During initialization reset the AFU to start from a clean slate */ | |
1800 | rc = cxl_afu_reset(cfg->mcctx); | |
1801 | if (unlikely(rc)) { | |
1802 | dev_err(dev, "%s: initial AFU reset failed rc=%d\n", | |
1803 | __func__, rc); | |
1804 | level = RELEASE_CONTEXT; | |
1805 | goto out; | |
1806 | } | |
1807 | ||
1808 | rc = cxl_allocate_afu_irqs(ctx, 3); | |
1809 | if (unlikely(rc)) { | |
1810 | dev_err(dev, "%s: call to allocate_afu_irqs failed rc=%d!\n", | |
1811 | __func__, rc); | |
1812 | level = RELEASE_CONTEXT; | |
1813 | goto out; | |
1814 | } | |
1815 | ||
1816 | rc = cxl_map_afu_irq(ctx, 1, cxlflash_sync_err_irq, afu, | |
1817 | "SISL_MSI_SYNC_ERROR"); | |
1818 | if (unlikely(rc <= 0)) { | |
1819 | dev_err(dev, "%s: IRQ 1 (SISL_MSI_SYNC_ERROR) map failed!\n", | |
1820 | __func__); | |
1821 | level = FREE_IRQ; | |
1822 | goto out; | |
1823 | } | |
1824 | ||
1825 | rc = cxl_map_afu_irq(ctx, 2, cxlflash_rrq_irq, afu, | |
1826 | "SISL_MSI_RRQ_UPDATED"); | |
1827 | if (unlikely(rc <= 0)) { | |
1828 | dev_err(dev, "%s: IRQ 2 (SISL_MSI_RRQ_UPDATED) map failed!\n", | |
1829 | __func__); | |
1830 | level = UNMAP_ONE; | |
1831 | goto out; | |
1832 | } | |
1833 | ||
1834 | rc = cxl_map_afu_irq(ctx, 3, cxlflash_async_err_irq, afu, | |
1835 | "SISL_MSI_ASYNC_ERROR"); | |
1836 | if (unlikely(rc <= 0)) { | |
1837 | dev_err(dev, "%s: IRQ 3 (SISL_MSI_ASYNC_ERROR) map failed!\n", | |
1838 | __func__); | |
1839 | level = UNMAP_TWO; | |
1840 | goto out; | |
1841 | } | |
1842 | ||
1843 | rc = 0; | |
1844 | ||
1845 | /* This performs the equivalent of the CXL_IOCTL_START_WORK. | |
1846 | * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process | |
1847 | * element (pe) that is embedded in the context (ctx) | |
1848 | */ | |
1849 | rc = start_context(cfg); | |
1850 | if (unlikely(rc)) { | |
1851 | dev_err(dev, "%s: start context failed rc=%d\n", __func__, rc); | |
1852 | level = UNMAP_THREE; | |
1853 | goto out; | |
1854 | } | |
1855 | ret: | |
1856 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1857 | return rc; | |
1858 | out: | |
1859 | term_mc(cfg, level); | |
1860 | goto ret; | |
1861 | } | |
1862 | ||
1863 | /** | |
1864 | * init_afu() - setup as master context and start AFU | |
1865 | * @cxlflash: Internal structure associated with the host. | |
1866 | * | |
1867 | * This routine is a higher level of control for configuring the | |
1868 | * AFU on probe and reset paths. | |
1869 | * | |
1870 | * Return: | |
1871 | * 0 on success | |
1872 | * -ENOMEM when unable to map the AFU MMIO space | |
1873 | * A failure value from internal services. | |
1874 | */ | |
1875 | static int init_afu(struct cxlflash_cfg *cfg) | |
1876 | { | |
1877 | u64 reg; | |
1878 | int rc = 0; | |
1879 | struct afu *afu = cfg->afu; | |
1880 | struct device *dev = &cfg->dev->dev; | |
1881 | ||
1882 | rc = init_mc(cfg); | |
1883 | if (rc) { | |
1884 | dev_err(dev, "%s: call to init_mc failed, rc=%d!\n", | |
1885 | __func__, rc); | |
1886 | goto err1; | |
1887 | } | |
1888 | ||
1889 | /* Map the entire MMIO space of the AFU. | |
1890 | */ | |
1891 | afu->afu_map = cxl_psa_map(cfg->mcctx); | |
1892 | if (!afu->afu_map) { | |
1893 | rc = -ENOMEM; | |
1894 | term_mc(cfg, UNDO_START); | |
1895 | dev_err(dev, "%s: call to cxl_psa_map failed!\n", __func__); | |
1896 | goto err1; | |
1897 | } | |
1898 | ||
1899 | /* don't byte reverse on reading afu_version, else the string form */ | |
1900 | /* will be backwards */ | |
1901 | reg = afu->afu_map->global.regs.afu_version; | |
1902 | memcpy(afu->version, ®, 8); | |
1903 | afu->interface_version = | |
1904 | readq_be(&afu->afu_map->global.regs.interface_version); | |
1905 | pr_debug("%s: afu version %s, interface version 0x%llX\n", | |
1906 | __func__, afu->version, afu->interface_version); | |
1907 | ||
1908 | rc = start_afu(cfg); | |
1909 | if (rc) { | |
1910 | dev_err(dev, "%s: call to start_afu failed, rc=%d!\n", | |
1911 | __func__, rc); | |
1912 | term_mc(cfg, UNDO_START); | |
1913 | cxl_psa_unmap((void *)afu->afu_map); | |
1914 | afu->afu_map = NULL; | |
1915 | goto err1; | |
1916 | } | |
1917 | ||
1918 | afu_err_intr_init(cfg->afu); | |
1919 | atomic64_set(&afu->room, readq_be(&afu->host_map->cmd_room)); | |
1920 | ||
1921 | err1: | |
1922 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1923 | return rc; | |
1924 | } | |
1925 | ||
1926 | /** | |
1927 | * cxlflash_send_cmd() - sends an AFU command | |
1928 | * @afu: AFU associated with the host. | |
1929 | * @cmd: AFU command to send. | |
1930 | * | |
1931 | * Return: | |
1932 | * 0 on success | |
1933 | * -1 on failure | |
1934 | */ | |
1935 | int cxlflash_send_cmd(struct afu *afu, struct afu_cmd *cmd) | |
1936 | { | |
1937 | struct cxlflash_cfg *cfg = afu->parent; | |
1938 | int nretry = 0; | |
1939 | int rc = 0; | |
1940 | u64 room; | |
1941 | long newval; | |
1942 | ||
1943 | /* | |
1944 | * This routine is used by critical users such an AFU sync and to | |
1945 | * send a task management function (TMF). Thus we want to retry a | |
1946 | * bit before returning an error. To avoid the performance penalty | |
1947 | * of MMIO, we spread the update of 'room' over multiple commands. | |
1948 | */ | |
1949 | retry: | |
1950 | newval = atomic64_dec_if_positive(&afu->room); | |
1951 | if (!newval) { | |
1952 | do { | |
1953 | room = readq_be(&afu->host_map->cmd_room); | |
1954 | atomic64_set(&afu->room, room); | |
1955 | if (room) | |
1956 | goto write_ioarrin; | |
1957 | udelay(nretry); | |
1958 | } while (nretry++ < MC_ROOM_RETRY_CNT); | |
1959 | ||
1960 | pr_err("%s: no cmd_room to send 0x%X\n", | |
1961 | __func__, cmd->rcb.cdb[0]); | |
1962 | ||
1963 | goto no_room; | |
1964 | } else if (unlikely(newval < 0)) { | |
1965 | /* This should be rare. i.e. Only if two threads race and | |
1966 | * decrement before the MMIO read is done. In this case | |
1967 | * just benefit from the other thread having updated | |
1968 | * afu->room. | |
1969 | */ | |
1970 | if (nretry++ < MC_ROOM_RETRY_CNT) { | |
1971 | udelay(nretry); | |
1972 | goto retry; | |
1973 | } | |
1974 | ||
1975 | goto no_room; | |
1976 | } | |
1977 | ||
1978 | write_ioarrin: | |
1979 | writeq_be((u64)&cmd->rcb, &afu->host_map->ioarrin); | |
1980 | out: | |
1981 | pr_debug("%s: cmd=%p len=%d ea=%p rc=%d\n", __func__, cmd, | |
1982 | cmd->rcb.data_len, (void *)cmd->rcb.data_ea, rc); | |
1983 | return rc; | |
1984 | ||
1985 | no_room: | |
1986 | afu->read_room = true; | |
1987 | schedule_work(&cfg->work_q); | |
1988 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
1989 | goto out; | |
1990 | } | |
1991 | ||
1992 | /** | |
1993 | * cxlflash_wait_resp() - polls for a response or timeout to a sent AFU command | |
1994 | * @afu: AFU associated with the host. | |
1995 | * @cmd: AFU command that was sent. | |
1996 | */ | |
1997 | void cxlflash_wait_resp(struct afu *afu, struct afu_cmd *cmd) | |
1998 | { | |
1999 | ulong timeout = jiffies + (cmd->rcb.timeout * 2 * HZ); | |
2000 | ||
2001 | timeout = wait_for_completion_timeout(&cmd->cevent, timeout); | |
2002 | if (!timeout) | |
2003 | cxlflash_context_reset(cmd); | |
2004 | ||
2005 | if (unlikely(cmd->sa.ioasc != 0)) | |
2006 | pr_err("%s: CMD 0x%X failed, IOASC: flags 0x%X, afu_rc 0x%X, " | |
2007 | "scsi_rc 0x%X, fc_rc 0x%X\n", __func__, cmd->rcb.cdb[0], | |
2008 | cmd->sa.rc.flags, cmd->sa.rc.afu_rc, cmd->sa.rc.scsi_rc, | |
2009 | cmd->sa.rc.fc_rc); | |
2010 | } | |
2011 | ||
2012 | /** | |
2013 | * cxlflash_afu_sync() - builds and sends an AFU sync command | |
2014 | * @afu: AFU associated with the host. | |
2015 | * @ctx_hndl_u: Identifies context requesting sync. | |
2016 | * @res_hndl_u: Identifies resource requesting sync. | |
2017 | * @mode: Type of sync to issue (lightweight, heavyweight, global). | |
2018 | * | |
2019 | * The AFU can only take 1 sync command at a time. This routine enforces this | |
2020 | * limitation by using a mutex to provide exlusive access to the AFU during | |
2021 | * the sync. This design point requires calling threads to not be on interrupt | |
2022 | * context due to the possibility of sleeping during concurrent sync operations. | |
2023 | * | |
2024 | * Return: | |
2025 | * 0 on success | |
2026 | * -1 on failure | |
2027 | */ | |
2028 | int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t ctx_hndl_u, | |
2029 | res_hndl_t res_hndl_u, u8 mode) | |
2030 | { | |
2031 | struct afu_cmd *cmd = NULL; | |
2032 | int rc = 0; | |
2033 | int retry_cnt = 0; | |
2034 | static DEFINE_MUTEX(sync_active); | |
2035 | ||
2036 | mutex_lock(&sync_active); | |
2037 | retry: | |
2038 | cmd = cxlflash_cmd_checkout(afu); | |
2039 | if (unlikely(!cmd)) { | |
2040 | retry_cnt++; | |
2041 | udelay(1000 * retry_cnt); | |
2042 | if (retry_cnt < MC_RETRY_CNT) | |
2043 | goto retry; | |
2044 | pr_err("%s: could not get a free command\n", __func__); | |
2045 | rc = -1; | |
2046 | goto out; | |
2047 | } | |
2048 | ||
2049 | pr_debug("%s: afu=%p cmd=%p %d\n", __func__, afu, cmd, ctx_hndl_u); | |
2050 | ||
2051 | memset(cmd->rcb.cdb, 0, sizeof(cmd->rcb.cdb)); | |
2052 | ||
2053 | cmd->rcb.req_flags = SISL_REQ_FLAGS_AFU_CMD; | |
2054 | cmd->rcb.port_sel = 0x0; /* NA */ | |
2055 | cmd->rcb.lun_id = 0x0; /* NA */ | |
2056 | cmd->rcb.data_len = 0x0; | |
2057 | cmd->rcb.data_ea = 0x0; | |
2058 | cmd->rcb.timeout = MC_AFU_SYNC_TIMEOUT; | |
2059 | ||
2060 | cmd->rcb.cdb[0] = 0xC0; /* AFU Sync */ | |
2061 | cmd->rcb.cdb[1] = mode; | |
2062 | ||
2063 | /* The cdb is aligned, no unaligned accessors required */ | |
2064 | *((u16 *)&cmd->rcb.cdb[2]) = swab16(ctx_hndl_u); | |
2065 | *((u32 *)&cmd->rcb.cdb[4]) = swab32(res_hndl_u); | |
2066 | ||
2067 | rc = cxlflash_send_cmd(afu, cmd); | |
2068 | if (unlikely(rc)) | |
2069 | goto out; | |
2070 | ||
2071 | cxlflash_wait_resp(afu, cmd); | |
2072 | ||
2073 | /* set on timeout */ | |
2074 | if (unlikely((cmd->sa.ioasc != 0) || | |
2075 | (cmd->sa.host_use_b[0] & B_ERROR))) | |
2076 | rc = -1; | |
2077 | out: | |
2078 | mutex_unlock(&sync_active); | |
2079 | if (cmd) | |
2080 | cxlflash_cmd_checkin(cmd); | |
2081 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
2082 | return rc; | |
2083 | } | |
2084 | ||
2085 | /** | |
2086 | * cxlflash_afu_reset() - resets the AFU | |
2087 | * @cxlflash: Internal structure associated with the host. | |
2088 | * | |
2089 | * Return: | |
2090 | * 0 on success | |
2091 | * A failure value from internal services. | |
2092 | */ | |
2093 | int cxlflash_afu_reset(struct cxlflash_cfg *cfg) | |
2094 | { | |
2095 | int rc = 0; | |
2096 | /* Stop the context before the reset. Since the context is | |
2097 | * no longer available restart it after the reset is complete | |
2098 | */ | |
2099 | ||
2100 | term_afu(cfg); | |
2101 | ||
2102 | rc = init_afu(cfg); | |
2103 | ||
2104 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
2105 | return rc; | |
2106 | } | |
2107 | ||
2108 | /** | |
2109 | * cxlflash_worker_thread() - work thread handler for the AFU | |
2110 | * @work: Work structure contained within cxlflash associated with host. | |
2111 | * | |
2112 | * Handles the following events: | |
2113 | * - Link reset which cannot be performed on interrupt context due to | |
2114 | * blocking up to a few seconds | |
2115 | * - Read AFU command room | |
2116 | */ | |
2117 | static void cxlflash_worker_thread(struct work_struct *work) | |
2118 | { | |
2119 | struct cxlflash_cfg *cfg = | |
2120 | container_of(work, struct cxlflash_cfg, work_q); | |
2121 | struct afu *afu = cfg->afu; | |
2122 | int port; | |
2123 | ulong lock_flags; | |
2124 | ||
2125 | spin_lock_irqsave(cfg->host->host_lock, lock_flags); | |
2126 | ||
2127 | if (cfg->lr_state == LINK_RESET_REQUIRED) { | |
2128 | port = cfg->lr_port; | |
2129 | if (port < 0) | |
2130 | pr_err("%s: invalid port index %d\n", __func__, port); | |
2131 | else { | |
2132 | spin_unlock_irqrestore(cfg->host->host_lock, | |
2133 | lock_flags); | |
2134 | ||
2135 | /* The reset can block... */ | |
2136 | afu_link_reset(afu, port, | |
2137 | &afu->afu_map-> | |
2138 | global.fc_regs[port][0]); | |
2139 | spin_lock_irqsave(cfg->host->host_lock, lock_flags); | |
2140 | } | |
2141 | ||
2142 | cfg->lr_state = LINK_RESET_COMPLETE; | |
2143 | } | |
2144 | ||
2145 | if (afu->read_room) { | |
2146 | atomic64_set(&afu->room, readq_be(&afu->host_map->cmd_room)); | |
2147 | afu->read_room = false; | |
2148 | } | |
2149 | ||
2150 | spin_unlock_irqrestore(cfg->host->host_lock, lock_flags); | |
2151 | } | |
2152 | ||
2153 | /** | |
2154 | * cxlflash_probe() - PCI entry point to add host | |
2155 | * @pdev: PCI device associated with the host. | |
2156 | * @dev_id: PCI device id associated with device. | |
2157 | * | |
2158 | * Return: 0 on success / non-zero on failure | |
2159 | */ | |
2160 | static int cxlflash_probe(struct pci_dev *pdev, | |
2161 | const struct pci_device_id *dev_id) | |
2162 | { | |
2163 | struct Scsi_Host *host; | |
2164 | struct cxlflash_cfg *cfg = NULL; | |
2165 | struct device *phys_dev; | |
2166 | struct dev_dependent_vals *ddv; | |
2167 | int rc = 0; | |
2168 | ||
2169 | dev_dbg(&pdev->dev, "%s: Found CXLFLASH with IRQ: %d\n", | |
2170 | __func__, pdev->irq); | |
2171 | ||
2172 | ddv = (struct dev_dependent_vals *)dev_id->driver_data; | |
2173 | driver_template.max_sectors = ddv->max_sectors; | |
2174 | ||
2175 | host = scsi_host_alloc(&driver_template, sizeof(struct cxlflash_cfg)); | |
2176 | if (!host) { | |
2177 | dev_err(&pdev->dev, "%s: call to scsi_host_alloc failed!\n", | |
2178 | __func__); | |
2179 | rc = -ENOMEM; | |
2180 | goto out; | |
2181 | } | |
2182 | ||
2183 | host->max_id = CXLFLASH_MAX_NUM_TARGETS_PER_BUS; | |
2184 | host->max_lun = CXLFLASH_MAX_NUM_LUNS_PER_TARGET; | |
2185 | host->max_channel = NUM_FC_PORTS - 1; | |
2186 | host->unique_id = host->host_no; | |
2187 | host->max_cmd_len = CXLFLASH_MAX_CDB_LEN; | |
2188 | ||
2189 | cfg = (struct cxlflash_cfg *)host->hostdata; | |
2190 | cfg->host = host; | |
2191 | rc = alloc_mem(cfg); | |
2192 | if (rc) { | |
2193 | dev_err(&pdev->dev, "%s: call to scsi_host_alloc failed!\n", | |
2194 | __func__); | |
2195 | rc = -ENOMEM; | |
2196 | goto out; | |
2197 | } | |
2198 | ||
2199 | cfg->init_state = INIT_STATE_NONE; | |
2200 | cfg->dev = pdev; | |
2201 | cfg->dev_id = (struct pci_device_id *)dev_id; | |
2202 | cfg->mcctx = NULL; | |
2203 | cfg->err_recovery_active = 0; | |
2204 | ||
2205 | init_waitqueue_head(&cfg->tmf_waitq); | |
2206 | init_waitqueue_head(&cfg->eeh_waitq); | |
2207 | ||
2208 | INIT_WORK(&cfg->work_q, cxlflash_worker_thread); | |
2209 | cfg->lr_state = LINK_RESET_INVALID; | |
2210 | cfg->lr_port = -1; | |
2211 | ||
2212 | pci_set_drvdata(pdev, cfg); | |
2213 | ||
2214 | /* Use the special service provided to look up the physical | |
2215 | * PCI device, since we are called on the probe of the virtual | |
2216 | * PCI host bus (vphb) | |
2217 | */ | |
2218 | phys_dev = cxl_get_phys_dev(pdev); | |
2219 | if (!dev_is_pci(phys_dev)) { | |
2220 | pr_err("%s: not a pci dev\n", __func__); | |
2221 | rc = -ENODEV; | |
2222 | goto out_remove; | |
2223 | } | |
2224 | cfg->parent_dev = to_pci_dev(phys_dev); | |
2225 | ||
2226 | cfg->cxl_afu = cxl_pci_to_afu(pdev); | |
2227 | ||
2228 | rc = init_pci(cfg); | |
2229 | if (rc) { | |
2230 | dev_err(&pdev->dev, "%s: call to init_pci " | |
2231 | "failed rc=%d!\n", __func__, rc); | |
2232 | goto out_remove; | |
2233 | } | |
2234 | cfg->init_state = INIT_STATE_PCI; | |
2235 | ||
2236 | rc = init_afu(cfg); | |
2237 | if (rc) { | |
2238 | dev_err(&pdev->dev, "%s: call to init_afu " | |
2239 | "failed rc=%d!\n", __func__, rc); | |
2240 | goto out_remove; | |
2241 | } | |
2242 | cfg->init_state = INIT_STATE_AFU; | |
2243 | ||
2244 | ||
2245 | rc = init_scsi(cfg); | |
2246 | if (rc) { | |
2247 | dev_err(&pdev->dev, "%s: call to init_scsi " | |
2248 | "failed rc=%d!\n", __func__, rc); | |
2249 | goto out_remove; | |
2250 | } | |
2251 | cfg->init_state = INIT_STATE_SCSI; | |
2252 | ||
2253 | out: | |
2254 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
2255 | return rc; | |
2256 | ||
2257 | out_remove: | |
2258 | cxlflash_remove(pdev); | |
2259 | goto out; | |
2260 | } | |
2261 | ||
2262 | /* | |
2263 | * PCI device structure | |
2264 | */ | |
2265 | static struct pci_driver cxlflash_driver = { | |
2266 | .name = CXLFLASH_NAME, | |
2267 | .id_table = cxlflash_pci_table, | |
2268 | .probe = cxlflash_probe, | |
2269 | .remove = cxlflash_remove, | |
2270 | }; | |
2271 | ||
2272 | /** | |
2273 | * init_cxlflash() - module entry point | |
2274 | * | |
2275 | * Return: 0 on success / non-zero on failure | |
2276 | */ | |
2277 | static int __init init_cxlflash(void) | |
2278 | { | |
2279 | pr_info("%s: IBM Power CXL Flash Adapter: %s\n", | |
2280 | __func__, CXLFLASH_DRIVER_DATE); | |
2281 | ||
2282 | return pci_register_driver(&cxlflash_driver); | |
2283 | } | |
2284 | ||
2285 | /** | |
2286 | * exit_cxlflash() - module exit point | |
2287 | */ | |
2288 | static void __exit exit_cxlflash(void) | |
2289 | { | |
2290 | pci_unregister_driver(&cxlflash_driver); | |
2291 | } | |
2292 | ||
2293 | module_init(init_cxlflash); | |
2294 | module_exit(exit_cxlflash); |