Commit | Line | Data |
---|---|---|
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> | |
65be2c79 | 26 | #include <uapi/scsi/cxlflash_ioctl.h> |
c21e0bbf MO |
27 | |
28 | #include "main.h" | |
29 | #include "sislite.h" | |
30 | #include "common.h" | |
31 | ||
32 | MODULE_DESCRIPTION(CXLFLASH_ADAPTER_NAME); | |
33 | MODULE_AUTHOR("Manoj N. Kumar <manoj@linux.vnet.ibm.com>"); | |
34 | MODULE_AUTHOR("Matthew R. Ochs <mrochs@linux.vnet.ibm.com>"); | |
35 | MODULE_LICENSE("GPL"); | |
36 | ||
c21e0bbf | 37 | /** |
15305514 | 38 | * cmd_checkout() - checks out an AFU command |
c21e0bbf MO |
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 | */ | |
15305514 | 49 | static struct afu_cmd *cmd_checkout(struct afu *afu) |
c21e0bbf MO |
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)) { | |
4392ba49 MO |
60 | pr_devel("%s: returning found index=%d cmd=%p\n", |
61 | __func__, cmd->slot, cmd); | |
c21e0bbf MO |
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 | /** | |
15305514 | 72 | * cmd_checkin() - checks in an AFU command |
c21e0bbf MO |
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 | */ | |
15305514 | 81 | static void cmd_checkin(struct afu_cmd *cmd) |
c21e0bbf MO |
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 | ||
4392ba49 | 95 | pr_devel("%s: released cmd %p index=%d\n", __func__, cmd, cmd->slot); |
c21e0bbf MO |
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; | |
8396012f | 109 | u32 resid; |
c21e0bbf MO |
110 | |
111 | if (unlikely(!cmd)) | |
112 | return; | |
113 | ||
114 | ioarcb = &(cmd->rcb); | |
115 | ioasa = &(cmd->sa); | |
116 | ||
117 | if (ioasa->rc.flags & SISL_RC_FLAGS_UNDERRUN) { | |
8396012f MO |
118 | resid = ioasa->resid; |
119 | scsi_set_resid(scp, resid); | |
120 | pr_debug("%s: cmd underrun cmd = %p scp = %p, resid = %d\n", | |
121 | __func__, cmd, scp, resid); | |
c21e0bbf MO |
122 | } |
123 | ||
124 | if (ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN) { | |
125 | pr_debug("%s: cmd underrun cmd = %p scp = %p\n", | |
126 | __func__, cmd, scp); | |
127 | scp->result = (DID_ERROR << 16); | |
128 | } | |
129 | ||
130 | pr_debug("%s: cmd failed afu_rc=%d scsi_rc=%d fc_rc=%d " | |
4392ba49 | 131 | "afu_extra=0x%X, scsi_extra=0x%X, fc_extra=0x%X\n", |
c21e0bbf MO |
132 | __func__, ioasa->rc.afu_rc, ioasa->rc.scsi_rc, |
133 | ioasa->rc.fc_rc, ioasa->afu_extra, ioasa->scsi_extra, | |
134 | ioasa->fc_extra); | |
135 | ||
136 | if (ioasa->rc.scsi_rc) { | |
137 | /* We have a SCSI status */ | |
138 | if (ioasa->rc.flags & SISL_RC_FLAGS_SENSE_VALID) { | |
139 | memcpy(scp->sense_buffer, ioasa->sense_data, | |
140 | SISL_SENSE_DATA_LEN); | |
141 | scp->result = ioasa->rc.scsi_rc; | |
142 | } else | |
143 | scp->result = ioasa->rc.scsi_rc | (DID_ERROR << 16); | |
144 | } | |
145 | ||
146 | /* | |
147 | * We encountered an error. Set scp->result based on nature | |
148 | * of error. | |
149 | */ | |
150 | if (ioasa->rc.fc_rc) { | |
151 | /* We have an FC status */ | |
152 | switch (ioasa->rc.fc_rc) { | |
153 | case SISL_FC_RC_LINKDOWN: | |
154 | scp->result = (DID_REQUEUE << 16); | |
155 | break; | |
156 | case SISL_FC_RC_RESID: | |
157 | /* This indicates an FCP resid underrun */ | |
158 | if (!(ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN)) { | |
159 | /* If the SISL_RC_FLAGS_OVERRUN flag was set, | |
160 | * then we will handle this error else where. | |
161 | * If not then we must handle it here. | |
8396012f | 162 | * This is probably an AFU bug. |
c21e0bbf MO |
163 | */ |
164 | scp->result = (DID_ERROR << 16); | |
165 | } | |
166 | break; | |
167 | case SISL_FC_RC_RESIDERR: | |
168 | /* Resid mismatch between adapter and device */ | |
169 | case SISL_FC_RC_TGTABORT: | |
170 | case SISL_FC_RC_ABORTOK: | |
171 | case SISL_FC_RC_ABORTFAIL: | |
172 | case SISL_FC_RC_NOLOGI: | |
173 | case SISL_FC_RC_ABORTPEND: | |
174 | case SISL_FC_RC_WRABORTPEND: | |
175 | case SISL_FC_RC_NOEXP: | |
176 | case SISL_FC_RC_INUSE: | |
177 | scp->result = (DID_ERROR << 16); | |
178 | break; | |
179 | } | |
180 | } | |
181 | ||
182 | if (ioasa->rc.afu_rc) { | |
183 | /* We have an AFU error */ | |
184 | switch (ioasa->rc.afu_rc) { | |
185 | case SISL_AFU_RC_NO_CHANNELS: | |
8396012f | 186 | scp->result = (DID_NO_CONNECT << 16); |
c21e0bbf MO |
187 | break; |
188 | case SISL_AFU_RC_DATA_DMA_ERR: | |
189 | switch (ioasa->afu_extra) { | |
190 | case SISL_AFU_DMA_ERR_PAGE_IN: | |
191 | /* Retry */ | |
192 | scp->result = (DID_IMM_RETRY << 16); | |
193 | break; | |
194 | case SISL_AFU_DMA_ERR_INVALID_EA: | |
195 | default: | |
196 | scp->result = (DID_ERROR << 16); | |
197 | } | |
198 | break; | |
199 | case SISL_AFU_RC_OUT_OF_DATA_BUFS: | |
200 | /* Retry */ | |
201 | scp->result = (DID_ALLOC_FAILURE << 16); | |
202 | break; | |
203 | default: | |
204 | scp->result = (DID_ERROR << 16); | |
205 | } | |
206 | } | |
207 | } | |
208 | ||
209 | /** | |
210 | * cmd_complete() - command completion handler | |
211 | * @cmd: AFU command that has completed. | |
212 | * | |
213 | * Prepares and submits command that has either completed or timed out to | |
214 | * the SCSI stack. Checks AFU command back into command pool for non-internal | |
215 | * (rcb.scp populated) commands. | |
216 | */ | |
217 | static void cmd_complete(struct afu_cmd *cmd) | |
218 | { | |
219 | struct scsi_cmnd *scp; | |
c21e0bbf MO |
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; | |
8396012f | 231 | if (unlikely(cmd->sa.ioasc)) |
c21e0bbf MO |
232 | process_cmd_err(cmd, scp); |
233 | else | |
234 | scp->result = (DID_OK << 16); | |
235 | ||
c21e0bbf | 236 | cmd_is_tmf = cmd->cmd_tmf; |
15305514 | 237 | cmd_checkin(cmd); /* Don't use cmd after here */ |
c21e0bbf | 238 | |
4392ba49 MO |
239 | pr_debug_ratelimited("%s: calling scsi_done scp=%p result=%X " |
240 | "ioasc=%d\n", __func__, scp, scp->result, | |
241 | cmd->sa.ioasc); | |
c21e0bbf | 242 | |
c21e0bbf MO |
243 | scsi_dma_unmap(scp); |
244 | scp->scsi_done(scp); | |
245 | ||
246 | if (cmd_is_tmf) { | |
018d1dc9 | 247 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
248 | cfg->tmf_active = false; |
249 | wake_up_all_locked(&cfg->tmf_waitq); | |
018d1dc9 | 250 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
251 | } |
252 | } else | |
253 | complete(&cmd->cevent); | |
254 | } | |
255 | ||
15305514 MO |
256 | /** |
257 | * context_reset() - timeout handler for AFU commands | |
258 | * @cmd: AFU command that timed out. | |
259 | * | |
260 | * Sends a reset to the AFU. | |
261 | */ | |
262 | static void context_reset(struct afu_cmd *cmd) | |
263 | { | |
264 | int nretry = 0; | |
265 | u64 rrin = 0x1; | |
266 | u64 room = 0; | |
267 | struct afu *afu = cmd->parent; | |
268 | ulong lock_flags; | |
269 | ||
270 | pr_debug("%s: cmd=%p\n", __func__, cmd); | |
271 | ||
272 | spin_lock_irqsave(&cmd->slock, lock_flags); | |
273 | ||
274 | /* Already completed? */ | |
275 | if (cmd->sa.host_use_b[0] & B_DONE) { | |
276 | spin_unlock_irqrestore(&cmd->slock, lock_flags); | |
277 | return; | |
278 | } | |
279 | ||
280 | cmd->sa.host_use_b[0] |= (B_DONE | B_ERROR | B_TIMEOUT); | |
281 | spin_unlock_irqrestore(&cmd->slock, lock_flags); | |
282 | ||
283 | /* | |
284 | * We really want to send this reset at all costs, so spread | |
285 | * out wait time on successive retries for available room. | |
286 | */ | |
287 | do { | |
288 | room = readq_be(&afu->host_map->cmd_room); | |
289 | atomic64_set(&afu->room, room); | |
290 | if (room) | |
291 | goto write_rrin; | |
292 | udelay(nretry); | |
293 | } while (nretry++ < MC_ROOM_RETRY_CNT); | |
294 | ||
295 | pr_err("%s: no cmd_room to send reset\n", __func__); | |
296 | return; | |
297 | ||
298 | write_rrin: | |
299 | nretry = 0; | |
300 | writeq_be(rrin, &afu->host_map->ioarrin); | |
301 | do { | |
302 | rrin = readq_be(&afu->host_map->ioarrin); | |
303 | if (rrin != 0x1) | |
304 | break; | |
305 | /* Double delay each time */ | |
b22b4037 | 306 | udelay(2 << nretry); |
15305514 MO |
307 | } while (nretry++ < MC_ROOM_RETRY_CNT); |
308 | } | |
309 | ||
310 | /** | |
311 | * send_cmd() - sends an AFU command | |
312 | * @afu: AFU associated with the host. | |
313 | * @cmd: AFU command to send. | |
314 | * | |
315 | * Return: | |
1284fb0c | 316 | * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure |
15305514 MO |
317 | */ |
318 | static int send_cmd(struct afu *afu, struct afu_cmd *cmd) | |
319 | { | |
320 | struct cxlflash_cfg *cfg = afu->parent; | |
321 | struct device *dev = &cfg->dev->dev; | |
322 | int nretry = 0; | |
323 | int rc = 0; | |
324 | u64 room; | |
325 | long newval; | |
326 | ||
327 | /* | |
328 | * This routine is used by critical users such an AFU sync and to | |
329 | * send a task management function (TMF). Thus we want to retry a | |
330 | * bit before returning an error. To avoid the performance penalty | |
331 | * of MMIO, we spread the update of 'room' over multiple commands. | |
332 | */ | |
333 | retry: | |
334 | newval = atomic64_dec_if_positive(&afu->room); | |
335 | if (!newval) { | |
336 | do { | |
337 | room = readq_be(&afu->host_map->cmd_room); | |
338 | atomic64_set(&afu->room, room); | |
339 | if (room) | |
340 | goto write_ioarrin; | |
341 | udelay(nretry); | |
342 | } while (nretry++ < MC_ROOM_RETRY_CNT); | |
343 | ||
344 | dev_err(dev, "%s: no cmd_room to send 0x%X\n", | |
345 | __func__, cmd->rcb.cdb[0]); | |
346 | ||
347 | goto no_room; | |
348 | } else if (unlikely(newval < 0)) { | |
349 | /* This should be rare. i.e. Only if two threads race and | |
350 | * decrement before the MMIO read is done. In this case | |
351 | * just benefit from the other thread having updated | |
352 | * afu->room. | |
353 | */ | |
354 | if (nretry++ < MC_ROOM_RETRY_CNT) { | |
355 | udelay(nretry); | |
356 | goto retry; | |
357 | } | |
358 | ||
359 | goto no_room; | |
360 | } | |
361 | ||
362 | write_ioarrin: | |
363 | writeq_be((u64)&cmd->rcb, &afu->host_map->ioarrin); | |
364 | out: | |
365 | pr_devel("%s: cmd=%p len=%d ea=%p rc=%d\n", __func__, cmd, | |
366 | cmd->rcb.data_len, (void *)cmd->rcb.data_ea, rc); | |
367 | return rc; | |
368 | ||
369 | no_room: | |
370 | afu->read_room = true; | |
b45cdbaf | 371 | kref_get(&cfg->afu->mapcount); |
15305514 MO |
372 | schedule_work(&cfg->work_q); |
373 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
374 | goto out; | |
375 | } | |
376 | ||
377 | /** | |
378 | * wait_resp() - polls for a response or timeout to a sent AFU command | |
379 | * @afu: AFU associated with the host. | |
380 | * @cmd: AFU command that was sent. | |
381 | */ | |
382 | static void wait_resp(struct afu *afu, struct afu_cmd *cmd) | |
383 | { | |
384 | ulong timeout = msecs_to_jiffies(cmd->rcb.timeout * 2 * 1000); | |
385 | ||
386 | timeout = wait_for_completion_timeout(&cmd->cevent, timeout); | |
387 | if (!timeout) | |
388 | context_reset(cmd); | |
389 | ||
390 | if (unlikely(cmd->sa.ioasc != 0)) | |
391 | pr_err("%s: CMD 0x%X failed, IOASC: flags 0x%X, afu_rc 0x%X, " | |
392 | "scsi_rc 0x%X, fc_rc 0x%X\n", __func__, cmd->rcb.cdb[0], | |
393 | cmd->sa.rc.flags, cmd->sa.rc.afu_rc, cmd->sa.rc.scsi_rc, | |
394 | cmd->sa.rc.fc_rc); | |
395 | } | |
396 | ||
c21e0bbf MO |
397 | /** |
398 | * send_tmf() - sends a Task Management Function (TMF) | |
399 | * @afu: AFU to checkout from. | |
400 | * @scp: SCSI command from stack. | |
401 | * @tmfcmd: TMF command to send. | |
402 | * | |
403 | * Return: | |
1284fb0c | 404 | * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure |
c21e0bbf MO |
405 | */ |
406 | static int send_tmf(struct afu *afu, struct scsi_cmnd *scp, u64 tmfcmd) | |
407 | { | |
408 | struct afu_cmd *cmd; | |
409 | ||
410 | u32 port_sel = scp->device->channel + 1; | |
411 | short lflag = 0; | |
412 | struct Scsi_Host *host = scp->device->host; | |
413 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; | |
4392ba49 | 414 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
415 | ulong lock_flags; |
416 | int rc = 0; | |
018d1dc9 | 417 | ulong to; |
c21e0bbf | 418 | |
15305514 | 419 | cmd = cmd_checkout(afu); |
c21e0bbf | 420 | if (unlikely(!cmd)) { |
4392ba49 | 421 | dev_err(dev, "%s: could not get a free command\n", __func__); |
c21e0bbf MO |
422 | rc = SCSI_MLQUEUE_HOST_BUSY; |
423 | goto out; | |
424 | } | |
425 | ||
018d1dc9 MO |
426 | /* When Task Management Function is active do not send another */ |
427 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); | |
c21e0bbf | 428 | if (cfg->tmf_active) |
018d1dc9 MO |
429 | wait_event_interruptible_lock_irq(cfg->tmf_waitq, |
430 | !cfg->tmf_active, | |
431 | cfg->tmf_slock); | |
c21e0bbf MO |
432 | cfg->tmf_active = true; |
433 | cmd->cmd_tmf = true; | |
018d1dc9 | 434 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
435 | |
436 | cmd->rcb.ctx_id = afu->ctx_hndl; | |
437 | cmd->rcb.port_sel = port_sel; | |
438 | cmd->rcb.lun_id = lun_to_lunid(scp->device->lun); | |
439 | ||
440 | lflag = SISL_REQ_FLAGS_TMF_CMD; | |
441 | ||
442 | cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID | | |
443 | SISL_REQ_FLAGS_SUP_UNDERRUN | lflag); | |
444 | ||
445 | /* Stash the scp in the reserved field, for reuse during interrupt */ | |
446 | cmd->rcb.scp = scp; | |
447 | ||
448 | /* Copy the CDB from the cmd passed in */ | |
449 | memcpy(cmd->rcb.cdb, &tmfcmd, sizeof(tmfcmd)); | |
450 | ||
451 | /* Send the command */ | |
15305514 | 452 | rc = send_cmd(afu, cmd); |
c21e0bbf | 453 | if (unlikely(rc)) { |
15305514 | 454 | cmd_checkin(cmd); |
018d1dc9 | 455 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 456 | cfg->tmf_active = false; |
018d1dc9 | 457 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
458 | goto out; |
459 | } | |
460 | ||
018d1dc9 MO |
461 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
462 | to = msecs_to_jiffies(5000); | |
463 | to = wait_event_interruptible_lock_irq_timeout(cfg->tmf_waitq, | |
464 | !cfg->tmf_active, | |
465 | cfg->tmf_slock, | |
466 | to); | |
467 | if (!to) { | |
468 | cfg->tmf_active = false; | |
469 | dev_err(dev, "%s: TMF timed out!\n", __func__); | |
470 | rc = -1; | |
471 | } | |
472 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); | |
c21e0bbf MO |
473 | out: |
474 | return rc; | |
475 | } | |
476 | ||
b45cdbaf MK |
477 | static void afu_unmap(struct kref *ref) |
478 | { | |
479 | struct afu *afu = container_of(ref, struct afu, mapcount); | |
480 | ||
481 | if (likely(afu->afu_map)) { | |
482 | cxl_psa_unmap((void __iomem *)afu->afu_map); | |
483 | afu->afu_map = NULL; | |
484 | } | |
485 | } | |
486 | ||
c21e0bbf MO |
487 | /** |
488 | * cxlflash_driver_info() - information handler for this host driver | |
489 | * @host: SCSI host associated with device. | |
490 | * | |
491 | * Return: A string describing the device. | |
492 | */ | |
493 | static const char *cxlflash_driver_info(struct Scsi_Host *host) | |
494 | { | |
495 | return CXLFLASH_ADAPTER_NAME; | |
496 | } | |
497 | ||
498 | /** | |
499 | * cxlflash_queuecommand() - sends a mid-layer request | |
500 | * @host: SCSI host associated with device. | |
501 | * @scp: SCSI command to send. | |
502 | * | |
1284fb0c | 503 | * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure |
c21e0bbf MO |
504 | */ |
505 | static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp) | |
506 | { | |
507 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; | |
508 | struct afu *afu = cfg->afu; | |
4392ba49 | 509 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
510 | struct afu_cmd *cmd; |
511 | u32 port_sel = scp->device->channel + 1; | |
512 | int nseg, i, ncount; | |
513 | struct scatterlist *sg; | |
514 | ulong lock_flags; | |
515 | short lflag = 0; | |
516 | int rc = 0; | |
b45cdbaf | 517 | int kref_got = 0; |
c21e0bbf | 518 | |
4392ba49 MO |
519 | dev_dbg_ratelimited(dev, "%s: (scp=%p) %d/%d/%d/%llu " |
520 | "cdb=(%08X-%08X-%08X-%08X)\n", | |
521 | __func__, scp, host->host_no, scp->device->channel, | |
522 | scp->device->id, scp->device->lun, | |
523 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
524 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
525 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
526 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
c21e0bbf | 527 | |
018d1dc9 MO |
528 | /* |
529 | * If a Task Management Function is active, wait for it to complete | |
c21e0bbf MO |
530 | * before continuing with regular commands. |
531 | */ | |
018d1dc9 | 532 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 533 | if (cfg->tmf_active) { |
018d1dc9 | 534 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
535 | rc = SCSI_MLQUEUE_HOST_BUSY; |
536 | goto out; | |
537 | } | |
018d1dc9 | 538 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 539 | |
5cdac81a | 540 | switch (cfg->state) { |
439e85c1 | 541 | case STATE_RESET: |
4392ba49 | 542 | dev_dbg_ratelimited(dev, "%s: device is in reset!\n", __func__); |
5cdac81a MO |
543 | rc = SCSI_MLQUEUE_HOST_BUSY; |
544 | goto out; | |
545 | case STATE_FAILTERM: | |
4392ba49 | 546 | dev_dbg_ratelimited(dev, "%s: device has failed!\n", __func__); |
5cdac81a MO |
547 | scp->result = (DID_NO_CONNECT << 16); |
548 | scp->scsi_done(scp); | |
549 | rc = 0; | |
550 | goto out; | |
551 | default: | |
552 | break; | |
553 | } | |
554 | ||
15305514 | 555 | cmd = cmd_checkout(afu); |
c21e0bbf | 556 | if (unlikely(!cmd)) { |
4392ba49 | 557 | dev_err(dev, "%s: could not get a free command\n", __func__); |
c21e0bbf MO |
558 | rc = SCSI_MLQUEUE_HOST_BUSY; |
559 | goto out; | |
560 | } | |
561 | ||
b45cdbaf MK |
562 | kref_get(&cfg->afu->mapcount); |
563 | kref_got = 1; | |
564 | ||
c21e0bbf MO |
565 | cmd->rcb.ctx_id = afu->ctx_hndl; |
566 | cmd->rcb.port_sel = port_sel; | |
567 | cmd->rcb.lun_id = lun_to_lunid(scp->device->lun); | |
568 | ||
569 | if (scp->sc_data_direction == DMA_TO_DEVICE) | |
570 | lflag = SISL_REQ_FLAGS_HOST_WRITE; | |
571 | else | |
572 | lflag = SISL_REQ_FLAGS_HOST_READ; | |
573 | ||
574 | cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID | | |
575 | SISL_REQ_FLAGS_SUP_UNDERRUN | lflag); | |
576 | ||
577 | /* Stash the scp in the reserved field, for reuse during interrupt */ | |
578 | cmd->rcb.scp = scp; | |
579 | ||
580 | nseg = scsi_dma_map(scp); | |
581 | if (unlikely(nseg < 0)) { | |
4392ba49 | 582 | dev_err(dev, "%s: Fail DMA map! nseg=%d\n", |
c21e0bbf MO |
583 | __func__, nseg); |
584 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
585 | goto out; | |
586 | } | |
587 | ||
588 | ncount = scsi_sg_count(scp); | |
589 | scsi_for_each_sg(scp, sg, ncount, i) { | |
590 | cmd->rcb.data_len = sg_dma_len(sg); | |
591 | cmd->rcb.data_ea = sg_dma_address(sg); | |
592 | } | |
593 | ||
594 | /* Copy the CDB from the scsi_cmnd passed in */ | |
595 | memcpy(cmd->rcb.cdb, scp->cmnd, sizeof(cmd->rcb.cdb)); | |
596 | ||
597 | /* Send the command */ | |
15305514 | 598 | rc = send_cmd(afu, cmd); |
c21e0bbf | 599 | if (unlikely(rc)) { |
15305514 | 600 | cmd_checkin(cmd); |
c21e0bbf MO |
601 | scsi_dma_unmap(scp); |
602 | } | |
603 | ||
604 | out: | |
b45cdbaf MK |
605 | if (kref_got) |
606 | kref_put(&afu->mapcount, afu_unmap); | |
4392ba49 | 607 | pr_devel("%s: returning rc=%d\n", __func__, rc); |
c21e0bbf MO |
608 | return rc; |
609 | } | |
610 | ||
611 | /** | |
15305514 | 612 | * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe |
1284fb0c | 613 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 614 | */ |
15305514 | 615 | static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg *cfg) |
c21e0bbf | 616 | { |
15305514 | 617 | struct pci_dev *pdev = cfg->dev; |
c21e0bbf | 618 | |
15305514 MO |
619 | if (pci_channel_offline(pdev)) |
620 | wait_event_timeout(cfg->reset_waitq, | |
621 | !pci_channel_offline(pdev), | |
622 | CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT); | |
c21e0bbf MO |
623 | } |
624 | ||
625 | /** | |
15305514 | 626 | * free_mem() - free memory associated with the AFU |
1284fb0c | 627 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 628 | */ |
15305514 | 629 | static void free_mem(struct cxlflash_cfg *cfg) |
c21e0bbf | 630 | { |
15305514 MO |
631 | int i; |
632 | char *buf = NULL; | |
633 | struct afu *afu = cfg->afu; | |
c21e0bbf | 634 | |
15305514 MO |
635 | if (cfg->afu) { |
636 | for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { | |
637 | buf = afu->cmd[i].buf; | |
638 | if (!((u64)buf & (PAGE_SIZE - 1))) | |
639 | free_page((ulong)buf); | |
640 | } | |
c21e0bbf | 641 | |
15305514 MO |
642 | free_pages((ulong)afu, get_order(sizeof(struct afu))); |
643 | cfg->afu = NULL; | |
5cdac81a | 644 | } |
c21e0bbf MO |
645 | } |
646 | ||
647 | /** | |
15305514 | 648 | * stop_afu() - stops the AFU command timers and unmaps the MMIO space |
1284fb0c | 649 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 650 | * |
15305514 | 651 | * Safe to call with AFU in a partially allocated/initialized state. |
ee91e332 MK |
652 | * |
653 | * Cleans up all state associated with the command queue, and unmaps | |
654 | * the MMIO space. | |
655 | * | |
656 | * - complete() will take care of commands we initiated (they'll be checked | |
657 | * in as part of the cleanup that occurs after the completion) | |
658 | * | |
659 | * - cmd_checkin() will take care of entries that we did not initiate and that | |
660 | * have not (and will not) complete because they are sitting on a [now stale] | |
661 | * hardware queue | |
c21e0bbf | 662 | */ |
15305514 | 663 | static void stop_afu(struct cxlflash_cfg *cfg) |
c21e0bbf | 664 | { |
15305514 MO |
665 | int i; |
666 | struct afu *afu = cfg->afu; | |
ee91e332 | 667 | struct afu_cmd *cmd; |
c21e0bbf | 668 | |
15305514 | 669 | if (likely(afu)) { |
ee91e332 MK |
670 | for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { |
671 | cmd = &afu->cmd[i]; | |
672 | complete(&cmd->cevent); | |
673 | if (!atomic_read(&cmd->free)) | |
674 | cmd_checkin(cmd); | |
675 | } | |
c21e0bbf MO |
676 | |
677 | if (likely(afu->afu_map)) { | |
1786f4a0 | 678 | cxl_psa_unmap((void __iomem *)afu->afu_map); |
c21e0bbf MO |
679 | afu->afu_map = NULL; |
680 | } | |
b45cdbaf | 681 | kref_put(&afu->mapcount, afu_unmap); |
c21e0bbf MO |
682 | } |
683 | } | |
684 | ||
685 | /** | |
686 | * term_mc() - terminates the master context | |
1284fb0c | 687 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
688 | * @level: Depth of allocation, where to begin waterfall tear down. |
689 | * | |
690 | * Safe to call with AFU/MC in partially allocated/initialized state. | |
691 | */ | |
692 | static void term_mc(struct cxlflash_cfg *cfg, enum undo_level level) | |
693 | { | |
694 | int rc = 0; | |
695 | struct afu *afu = cfg->afu; | |
4392ba49 | 696 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
697 | |
698 | if (!afu || !cfg->mcctx) { | |
4392ba49 | 699 | dev_err(dev, "%s: returning from term_mc with NULL afu or MC\n", |
c21e0bbf MO |
700 | __func__); |
701 | return; | |
702 | } | |
703 | ||
704 | switch (level) { | |
705 | case UNDO_START: | |
706 | rc = cxl_stop_context(cfg->mcctx); | |
707 | BUG_ON(rc); | |
708 | case UNMAP_THREE: | |
709 | cxl_unmap_afu_irq(cfg->mcctx, 3, afu); | |
710 | case UNMAP_TWO: | |
711 | cxl_unmap_afu_irq(cfg->mcctx, 2, afu); | |
712 | case UNMAP_ONE: | |
713 | cxl_unmap_afu_irq(cfg->mcctx, 1, afu); | |
714 | case FREE_IRQ: | |
715 | cxl_free_afu_irqs(cfg->mcctx); | |
716 | case RELEASE_CONTEXT: | |
717 | cfg->mcctx = NULL; | |
718 | } | |
719 | } | |
720 | ||
721 | /** | |
722 | * term_afu() - terminates the AFU | |
1284fb0c | 723 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
724 | * |
725 | * Safe to call with AFU/MC in partially allocated/initialized state. | |
726 | */ | |
727 | static void term_afu(struct cxlflash_cfg *cfg) | |
728 | { | |
729 | term_mc(cfg, UNDO_START); | |
730 | ||
731 | if (cfg->afu) | |
732 | stop_afu(cfg); | |
733 | ||
734 | pr_debug("%s: returning\n", __func__); | |
735 | } | |
736 | ||
737 | /** | |
738 | * cxlflash_remove() - PCI entry point to tear down host | |
739 | * @pdev: PCI device associated with the host. | |
740 | * | |
741 | * Safe to use as a cleanup in partially allocated/initialized state. | |
742 | */ | |
743 | static void cxlflash_remove(struct pci_dev *pdev) | |
744 | { | |
745 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); | |
746 | ulong lock_flags; | |
747 | ||
748 | /* If a Task Management Function is active, wait for it to complete | |
749 | * before continuing with remove. | |
750 | */ | |
018d1dc9 | 751 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 752 | if (cfg->tmf_active) |
018d1dc9 MO |
753 | wait_event_interruptible_lock_irq(cfg->tmf_waitq, |
754 | !cfg->tmf_active, | |
755 | cfg->tmf_slock); | |
756 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); | |
c21e0bbf | 757 | |
5cdac81a | 758 | cfg->state = STATE_FAILTERM; |
65be2c79 | 759 | cxlflash_stop_term_user_contexts(cfg); |
5cdac81a | 760 | |
c21e0bbf MO |
761 | switch (cfg->init_state) { |
762 | case INIT_STATE_SCSI: | |
65be2c79 | 763 | cxlflash_term_local_luns(cfg); |
c21e0bbf | 764 | scsi_remove_host(cfg->host); |
f15fbf8d | 765 | /* fall through */ |
c21e0bbf | 766 | case INIT_STATE_AFU: |
d804621d | 767 | cancel_work_sync(&cfg->work_q); |
b45cdbaf | 768 | term_afu(cfg); |
c21e0bbf MO |
769 | case INIT_STATE_PCI: |
770 | pci_release_regions(cfg->dev); | |
771 | pci_disable_device(pdev); | |
772 | case INIT_STATE_NONE: | |
c21e0bbf | 773 | free_mem(cfg); |
8b5b1e87 | 774 | scsi_host_put(cfg->host); |
c21e0bbf MO |
775 | break; |
776 | } | |
777 | ||
778 | pr_debug("%s: returning\n", __func__); | |
779 | } | |
780 | ||
781 | /** | |
782 | * alloc_mem() - allocates the AFU and its command pool | |
1284fb0c | 783 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
784 | * |
785 | * A partially allocated state remains on failure. | |
786 | * | |
787 | * Return: | |
788 | * 0 on success | |
789 | * -ENOMEM on failure to allocate memory | |
790 | */ | |
791 | static int alloc_mem(struct cxlflash_cfg *cfg) | |
792 | { | |
793 | int rc = 0; | |
794 | int i; | |
795 | char *buf = NULL; | |
4392ba49 | 796 | struct device *dev = &cfg->dev->dev; |
c21e0bbf | 797 | |
f15fbf8d | 798 | /* AFU is ~12k, i.e. only one 64k page or up to four 4k pages */ |
c21e0bbf MO |
799 | cfg->afu = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, |
800 | get_order(sizeof(struct afu))); | |
801 | if (unlikely(!cfg->afu)) { | |
4392ba49 MO |
802 | dev_err(dev, "%s: cannot get %d free pages\n", |
803 | __func__, get_order(sizeof(struct afu))); | |
c21e0bbf MO |
804 | rc = -ENOMEM; |
805 | goto out; | |
806 | } | |
807 | cfg->afu->parent = cfg; | |
808 | cfg->afu->afu_map = NULL; | |
809 | ||
810 | for (i = 0; i < CXLFLASH_NUM_CMDS; buf += CMD_BUFSIZE, i++) { | |
811 | if (!((u64)buf & (PAGE_SIZE - 1))) { | |
812 | buf = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO); | |
813 | if (unlikely(!buf)) { | |
4392ba49 MO |
814 | dev_err(dev, |
815 | "%s: Allocate command buffers fail!\n", | |
c21e0bbf MO |
816 | __func__); |
817 | rc = -ENOMEM; | |
818 | free_mem(cfg); | |
819 | goto out; | |
820 | } | |
821 | } | |
822 | ||
823 | cfg->afu->cmd[i].buf = buf; | |
824 | atomic_set(&cfg->afu->cmd[i].free, 1); | |
825 | cfg->afu->cmd[i].slot = i; | |
826 | } | |
827 | ||
828 | out: | |
829 | return rc; | |
830 | } | |
831 | ||
832 | /** | |
833 | * init_pci() - initializes the host as a PCI device | |
1284fb0c | 834 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 835 | * |
1284fb0c | 836 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
837 | */ |
838 | static int init_pci(struct cxlflash_cfg *cfg) | |
839 | { | |
840 | struct pci_dev *pdev = cfg->dev; | |
841 | int rc = 0; | |
842 | ||
843 | cfg->cxlflash_regs_pci = pci_resource_start(pdev, 0); | |
844 | rc = pci_request_regions(pdev, CXLFLASH_NAME); | |
845 | if (rc < 0) { | |
846 | dev_err(&pdev->dev, | |
847 | "%s: Couldn't register memory range of registers\n", | |
848 | __func__); | |
849 | goto out; | |
850 | } | |
851 | ||
852 | rc = pci_enable_device(pdev); | |
853 | if (rc || pci_channel_offline(pdev)) { | |
854 | if (pci_channel_offline(pdev)) { | |
855 | cxlflash_wait_for_pci_err_recovery(cfg); | |
856 | rc = pci_enable_device(pdev); | |
857 | } | |
858 | ||
859 | if (rc) { | |
860 | dev_err(&pdev->dev, "%s: Cannot enable adapter\n", | |
861 | __func__); | |
862 | cxlflash_wait_for_pci_err_recovery(cfg); | |
863 | goto out_release_regions; | |
864 | } | |
865 | } | |
866 | ||
867 | rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); | |
868 | if (rc < 0) { | |
869 | dev_dbg(&pdev->dev, "%s: Failed to set 64 bit PCI DMA mask\n", | |
870 | __func__); | |
871 | rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); | |
872 | } | |
873 | ||
874 | if (rc < 0) { | |
875 | dev_err(&pdev->dev, "%s: Failed to set PCI DMA mask\n", | |
876 | __func__); | |
877 | goto out_disable; | |
878 | } | |
879 | ||
880 | pci_set_master(pdev); | |
881 | ||
882 | if (pci_channel_offline(pdev)) { | |
883 | cxlflash_wait_for_pci_err_recovery(cfg); | |
884 | if (pci_channel_offline(pdev)) { | |
885 | rc = -EIO; | |
886 | goto out_msi_disable; | |
887 | } | |
888 | } | |
889 | ||
890 | rc = pci_save_state(pdev); | |
891 | ||
892 | if (rc != PCIBIOS_SUCCESSFUL) { | |
893 | dev_err(&pdev->dev, "%s: Failed to save PCI config space\n", | |
894 | __func__); | |
895 | rc = -EIO; | |
896 | goto cleanup_nolog; | |
897 | } | |
898 | ||
899 | out: | |
900 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
901 | return rc; | |
902 | ||
903 | cleanup_nolog: | |
904 | out_msi_disable: | |
905 | cxlflash_wait_for_pci_err_recovery(cfg); | |
906 | out_disable: | |
907 | pci_disable_device(pdev); | |
908 | out_release_regions: | |
909 | pci_release_regions(pdev); | |
910 | goto out; | |
911 | ||
912 | } | |
913 | ||
914 | /** | |
915 | * init_scsi() - adds the host to the SCSI stack and kicks off host scan | |
1284fb0c | 916 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 917 | * |
1284fb0c | 918 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
919 | */ |
920 | static int init_scsi(struct cxlflash_cfg *cfg) | |
921 | { | |
922 | struct pci_dev *pdev = cfg->dev; | |
923 | int rc = 0; | |
924 | ||
925 | rc = scsi_add_host(cfg->host, &pdev->dev); | |
926 | if (rc) { | |
927 | dev_err(&pdev->dev, "%s: scsi_add_host failed (rc=%d)\n", | |
928 | __func__, rc); | |
929 | goto out; | |
930 | } | |
931 | ||
932 | scsi_scan_host(cfg->host); | |
933 | ||
934 | out: | |
935 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
936 | return rc; | |
937 | } | |
938 | ||
939 | /** | |
940 | * set_port_online() - transitions the specified host FC port to online state | |
941 | * @fc_regs: Top of MMIO region defined for specified port. | |
942 | * | |
943 | * The provided MMIO region must be mapped prior to call. Online state means | |
944 | * that the FC link layer has synced, completed the handshaking process, and | |
945 | * is ready for login to start. | |
946 | */ | |
1786f4a0 | 947 | static void set_port_online(__be64 __iomem *fc_regs) |
c21e0bbf MO |
948 | { |
949 | u64 cmdcfg; | |
950 | ||
951 | cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
952 | cmdcfg &= (~FC_MTIP_CMDCONFIG_OFFLINE); /* clear OFF_LINE */ | |
953 | cmdcfg |= (FC_MTIP_CMDCONFIG_ONLINE); /* set ON_LINE */ | |
954 | writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
955 | } | |
956 | ||
957 | /** | |
958 | * set_port_offline() - transitions the specified host FC port to offline state | |
959 | * @fc_regs: Top of MMIO region defined for specified port. | |
960 | * | |
961 | * The provided MMIO region must be mapped prior to call. | |
962 | */ | |
1786f4a0 | 963 | static void set_port_offline(__be64 __iomem *fc_regs) |
c21e0bbf MO |
964 | { |
965 | u64 cmdcfg; | |
966 | ||
967 | cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
968 | cmdcfg &= (~FC_MTIP_CMDCONFIG_ONLINE); /* clear ON_LINE */ | |
969 | cmdcfg |= (FC_MTIP_CMDCONFIG_OFFLINE); /* set OFF_LINE */ | |
970 | writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
971 | } | |
972 | ||
973 | /** | |
974 | * wait_port_online() - waits for the specified host FC port come online | |
975 | * @fc_regs: Top of MMIO region defined for specified port. | |
976 | * @delay_us: Number of microseconds to delay between reading port status. | |
977 | * @nretry: Number of cycles to retry reading port status. | |
978 | * | |
979 | * The provided MMIO region must be mapped prior to call. This will timeout | |
980 | * when the cable is not plugged in. | |
981 | * | |
982 | * Return: | |
983 | * TRUE (1) when the specified port is online | |
984 | * FALSE (0) when the specified port fails to come online after timeout | |
985 | * -EINVAL when @delay_us is less than 1000 | |
986 | */ | |
1786f4a0 | 987 | static int wait_port_online(__be64 __iomem *fc_regs, u32 delay_us, u32 nretry) |
c21e0bbf MO |
988 | { |
989 | u64 status; | |
990 | ||
991 | if (delay_us < 1000) { | |
992 | pr_err("%s: invalid delay specified %d\n", __func__, delay_us); | |
993 | return -EINVAL; | |
994 | } | |
995 | ||
996 | do { | |
997 | msleep(delay_us / 1000); | |
998 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); | |
999 | } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_ONLINE && | |
1000 | nretry--); | |
1001 | ||
1002 | return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_ONLINE); | |
1003 | } | |
1004 | ||
1005 | /** | |
1006 | * wait_port_offline() - waits for the specified host FC port go offline | |
1007 | * @fc_regs: Top of MMIO region defined for specified port. | |
1008 | * @delay_us: Number of microseconds to delay between reading port status. | |
1009 | * @nretry: Number of cycles to retry reading port status. | |
1010 | * | |
1011 | * The provided MMIO region must be mapped prior to call. | |
1012 | * | |
1013 | * Return: | |
1014 | * TRUE (1) when the specified port is offline | |
1015 | * FALSE (0) when the specified port fails to go offline after timeout | |
1016 | * -EINVAL when @delay_us is less than 1000 | |
1017 | */ | |
1786f4a0 | 1018 | static int wait_port_offline(__be64 __iomem *fc_regs, u32 delay_us, u32 nretry) |
c21e0bbf MO |
1019 | { |
1020 | u64 status; | |
1021 | ||
1022 | if (delay_us < 1000) { | |
1023 | pr_err("%s: invalid delay specified %d\n", __func__, delay_us); | |
1024 | return -EINVAL; | |
1025 | } | |
1026 | ||
1027 | do { | |
1028 | msleep(delay_us / 1000); | |
1029 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); | |
1030 | } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_OFFLINE && | |
1031 | nretry--); | |
1032 | ||
1033 | return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_OFFLINE); | |
1034 | } | |
1035 | ||
1036 | /** | |
1037 | * afu_set_wwpn() - configures the WWPN for the specified host FC port | |
1038 | * @afu: AFU associated with the host that owns the specified FC port. | |
1039 | * @port: Port number being configured. | |
1040 | * @fc_regs: Top of MMIO region defined for specified port. | |
1041 | * @wwpn: The world-wide-port-number previously discovered for port. | |
1042 | * | |
1043 | * The provided MMIO region must be mapped prior to call. As part of the | |
1044 | * sequence to configure the WWPN, the port is toggled offline and then back | |
1045 | * online. This toggling action can cause this routine to delay up to a few | |
1046 | * seconds. When configured to use the internal LUN feature of the AFU, a | |
1047 | * failure to come online is overridden. | |
1048 | * | |
1049 | * Return: | |
1050 | * 0 when the WWPN is successfully written and the port comes back online | |
1051 | * -1 when the port fails to go offline or come back up online | |
1052 | */ | |
1786f4a0 MO |
1053 | static int afu_set_wwpn(struct afu *afu, int port, __be64 __iomem *fc_regs, |
1054 | u64 wwpn) | |
c21e0bbf | 1055 | { |
964497b3 | 1056 | int rc = 0; |
c21e0bbf MO |
1057 | |
1058 | set_port_offline(fc_regs); | |
1059 | ||
1060 | if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
1061 | FC_PORT_STATUS_RETRY_CNT)) { | |
1062 | pr_debug("%s: wait on port %d to go offline timed out\n", | |
1063 | __func__, port); | |
964497b3 | 1064 | rc = -1; /* but continue on to leave the port back online */ |
c21e0bbf MO |
1065 | } |
1066 | ||
964497b3 | 1067 | if (rc == 0) |
c21e0bbf MO |
1068 | writeq_be(wwpn, &fc_regs[FC_PNAME / 8]); |
1069 | ||
964497b3 MO |
1070 | /* Always return success after programming WWPN */ |
1071 | rc = 0; | |
1072 | ||
c21e0bbf MO |
1073 | set_port_online(fc_regs); |
1074 | ||
1075 | if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
1076 | FC_PORT_STATUS_RETRY_CNT)) { | |
964497b3 MO |
1077 | pr_err("%s: wait on port %d to go online timed out\n", |
1078 | __func__, port); | |
c21e0bbf MO |
1079 | } |
1080 | ||
964497b3 | 1081 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
c21e0bbf | 1082 | |
964497b3 | 1083 | return rc; |
c21e0bbf MO |
1084 | } |
1085 | ||
1086 | /** | |
1087 | * afu_link_reset() - resets the specified host FC port | |
1088 | * @afu: AFU associated with the host that owns the specified FC port. | |
1089 | * @port: Port number being configured. | |
1090 | * @fc_regs: Top of MMIO region defined for specified port. | |
1091 | * | |
1092 | * The provided MMIO region must be mapped prior to call. The sequence to | |
1093 | * reset the port involves toggling it offline and then back online. This | |
1094 | * action can cause this routine to delay up to a few seconds. An effort | |
1095 | * is made to maintain link with the device by switching to host to use | |
1096 | * the alternate port exclusively while the reset takes place. | |
1097 | * failure to come online is overridden. | |
1098 | */ | |
1786f4a0 | 1099 | static void afu_link_reset(struct afu *afu, int port, __be64 __iomem *fc_regs) |
c21e0bbf MO |
1100 | { |
1101 | u64 port_sel; | |
1102 | ||
1103 | /* first switch the AFU to the other links, if any */ | |
1104 | port_sel = readq_be(&afu->afu_map->global.regs.afu_port_sel); | |
4da74db0 | 1105 | port_sel &= ~(1ULL << port); |
c21e0bbf MO |
1106 | writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); |
1107 | cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); | |
1108 | ||
1109 | set_port_offline(fc_regs); | |
1110 | if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
1111 | FC_PORT_STATUS_RETRY_CNT)) | |
1112 | pr_err("%s: wait on port %d to go offline timed out\n", | |
1113 | __func__, port); | |
1114 | ||
1115 | set_port_online(fc_regs); | |
1116 | if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
1117 | FC_PORT_STATUS_RETRY_CNT)) | |
1118 | pr_err("%s: wait on port %d to go online timed out\n", | |
1119 | __func__, port); | |
1120 | ||
1121 | /* switch back to include this port */ | |
4da74db0 | 1122 | port_sel |= (1ULL << port); |
c21e0bbf MO |
1123 | writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); |
1124 | cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); | |
1125 | ||
1126 | pr_debug("%s: returning port_sel=%lld\n", __func__, port_sel); | |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | * Asynchronous interrupt information table | |
1131 | */ | |
1132 | static const struct asyc_intr_info ainfo[] = { | |
1133 | {SISL_ASTATUS_FC0_OTHER, "other error", 0, CLR_FC_ERROR | LINK_RESET}, | |
1134 | {SISL_ASTATUS_FC0_LOGO, "target initiated LOGO", 0, 0}, | |
1135 | {SISL_ASTATUS_FC0_CRC_T, "CRC threshold exceeded", 0, LINK_RESET}, | |
e6e6df3f | 1136 | {SISL_ASTATUS_FC0_LOGI_R, "login timed out, retrying", 0, LINK_RESET}, |
c21e0bbf | 1137 | {SISL_ASTATUS_FC0_LOGI_F, "login failed", 0, CLR_FC_ERROR}, |
ef51074a | 1138 | {SISL_ASTATUS_FC0_LOGI_S, "login succeeded", 0, SCAN_HOST}, |
c21e0bbf | 1139 | {SISL_ASTATUS_FC0_LINK_DN, "link down", 0, 0}, |
ef51074a | 1140 | {SISL_ASTATUS_FC0_LINK_UP, "link up", 0, SCAN_HOST}, |
c21e0bbf MO |
1141 | {SISL_ASTATUS_FC1_OTHER, "other error", 1, CLR_FC_ERROR | LINK_RESET}, |
1142 | {SISL_ASTATUS_FC1_LOGO, "target initiated LOGO", 1, 0}, | |
1143 | {SISL_ASTATUS_FC1_CRC_T, "CRC threshold exceeded", 1, LINK_RESET}, | |
a9be294e | 1144 | {SISL_ASTATUS_FC1_LOGI_R, "login timed out, retrying", 1, LINK_RESET}, |
c21e0bbf | 1145 | {SISL_ASTATUS_FC1_LOGI_F, "login failed", 1, CLR_FC_ERROR}, |
ef51074a | 1146 | {SISL_ASTATUS_FC1_LOGI_S, "login succeeded", 1, SCAN_HOST}, |
c21e0bbf | 1147 | {SISL_ASTATUS_FC1_LINK_DN, "link down", 1, 0}, |
ef51074a | 1148 | {SISL_ASTATUS_FC1_LINK_UP, "link up", 1, SCAN_HOST}, |
c21e0bbf MO |
1149 | {0x0, "", 0, 0} /* terminator */ |
1150 | }; | |
1151 | ||
1152 | /** | |
1153 | * find_ainfo() - locates and returns asynchronous interrupt information | |
1154 | * @status: Status code set by AFU on error. | |
1155 | * | |
1156 | * Return: The located information or NULL when the status code is invalid. | |
1157 | */ | |
1158 | static const struct asyc_intr_info *find_ainfo(u64 status) | |
1159 | { | |
1160 | const struct asyc_intr_info *info; | |
1161 | ||
1162 | for (info = &ainfo[0]; info->status; info++) | |
1163 | if (info->status == status) | |
1164 | return info; | |
1165 | ||
1166 | return NULL; | |
1167 | } | |
1168 | ||
1169 | /** | |
1170 | * afu_err_intr_init() - clears and initializes the AFU for error interrupts | |
1171 | * @afu: AFU associated with the host. | |
1172 | */ | |
1173 | static void afu_err_intr_init(struct afu *afu) | |
1174 | { | |
1175 | int i; | |
1176 | u64 reg; | |
1177 | ||
1178 | /* global async interrupts: AFU clears afu_ctrl on context exit | |
1179 | * if async interrupts were sent to that context. This prevents | |
1180 | * the AFU form sending further async interrupts when | |
1181 | * there is | |
1182 | * nobody to receive them. | |
1183 | */ | |
1184 | ||
1185 | /* mask all */ | |
1186 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_mask); | |
1187 | /* set LISN# to send and point to master context */ | |
1188 | reg = ((u64) (((afu->ctx_hndl << 8) | SISL_MSI_ASYNC_ERROR)) << 40); | |
1189 | ||
1190 | if (afu->internal_lun) | |
1191 | reg |= 1; /* Bit 63 indicates local lun */ | |
1192 | writeq_be(reg, &afu->afu_map->global.regs.afu_ctrl); | |
1193 | /* clear all */ | |
1194 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); | |
1195 | /* unmask bits that are of interest */ | |
1196 | /* note: afu can send an interrupt after this step */ | |
1197 | writeq_be(SISL_ASTATUS_MASK, &afu->afu_map->global.regs.aintr_mask); | |
1198 | /* clear again in case a bit came on after previous clear but before */ | |
1199 | /* unmask */ | |
1200 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); | |
1201 | ||
1202 | /* Clear/Set internal lun bits */ | |
1203 | reg = readq_be(&afu->afu_map->global.fc_regs[0][FC_CONFIG2 / 8]); | |
1204 | reg &= SISL_FC_INTERNAL_MASK; | |
1205 | if (afu->internal_lun) | |
1206 | reg |= ((u64)(afu->internal_lun - 1) << SISL_FC_INTERNAL_SHIFT); | |
1207 | writeq_be(reg, &afu->afu_map->global.fc_regs[0][FC_CONFIG2 / 8]); | |
1208 | ||
1209 | /* now clear FC errors */ | |
1210 | for (i = 0; i < NUM_FC_PORTS; i++) { | |
1211 | writeq_be(0xFFFFFFFFU, | |
1212 | &afu->afu_map->global.fc_regs[i][FC_ERROR / 8]); | |
1213 | writeq_be(0, &afu->afu_map->global.fc_regs[i][FC_ERRCAP / 8]); | |
1214 | } | |
1215 | ||
1216 | /* sync interrupts for master's IOARRIN write */ | |
1217 | /* note that unlike asyncs, there can be no pending sync interrupts */ | |
1218 | /* at this time (this is a fresh context and master has not written */ | |
1219 | /* IOARRIN yet), so there is nothing to clear. */ | |
1220 | ||
1221 | /* set LISN#, it is always sent to the context that wrote IOARRIN */ | |
1222 | writeq_be(SISL_MSI_SYNC_ERROR, &afu->host_map->ctx_ctrl); | |
1223 | writeq_be(SISL_ISTATUS_MASK, &afu->host_map->intr_mask); | |
1224 | } | |
1225 | ||
1226 | /** | |
1227 | * cxlflash_sync_err_irq() - interrupt handler for synchronous errors | |
1228 | * @irq: Interrupt number. | |
1229 | * @data: Private data provided at interrupt registration, the AFU. | |
1230 | * | |
1231 | * Return: Always return IRQ_HANDLED. | |
1232 | */ | |
1233 | static irqreturn_t cxlflash_sync_err_irq(int irq, void *data) | |
1234 | { | |
1235 | struct afu *afu = (struct afu *)data; | |
1236 | u64 reg; | |
1237 | u64 reg_unmasked; | |
1238 | ||
1239 | reg = readq_be(&afu->host_map->intr_status); | |
1240 | reg_unmasked = (reg & SISL_ISTATUS_UNMASK); | |
1241 | ||
1242 | if (reg_unmasked == 0UL) { | |
1243 | pr_err("%s: %llX: spurious interrupt, intr_status %016llX\n", | |
1244 | __func__, (u64)afu, reg); | |
1245 | goto cxlflash_sync_err_irq_exit; | |
1246 | } | |
1247 | ||
1248 | pr_err("%s: %llX: unexpected interrupt, intr_status %016llX\n", | |
1249 | __func__, (u64)afu, reg); | |
1250 | ||
1251 | writeq_be(reg_unmasked, &afu->host_map->intr_clear); | |
1252 | ||
1253 | cxlflash_sync_err_irq_exit: | |
1254 | pr_debug("%s: returning rc=%d\n", __func__, IRQ_HANDLED); | |
1255 | return IRQ_HANDLED; | |
1256 | } | |
1257 | ||
1258 | /** | |
1259 | * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path) | |
1260 | * @irq: Interrupt number. | |
1261 | * @data: Private data provided at interrupt registration, the AFU. | |
1262 | * | |
1263 | * Return: Always return IRQ_HANDLED. | |
1264 | */ | |
1265 | static irqreturn_t cxlflash_rrq_irq(int irq, void *data) | |
1266 | { | |
1267 | struct afu *afu = (struct afu *)data; | |
1268 | struct afu_cmd *cmd; | |
1269 | bool toggle = afu->toggle; | |
1270 | u64 entry, | |
1271 | *hrrq_start = afu->hrrq_start, | |
1272 | *hrrq_end = afu->hrrq_end, | |
1273 | *hrrq_curr = afu->hrrq_curr; | |
1274 | ||
1275 | /* Process however many RRQ entries that are ready */ | |
1276 | while (true) { | |
1277 | entry = *hrrq_curr; | |
1278 | ||
1279 | if ((entry & SISL_RESP_HANDLE_T_BIT) != toggle) | |
1280 | break; | |
1281 | ||
1282 | cmd = (struct afu_cmd *)(entry & ~SISL_RESP_HANDLE_T_BIT); | |
1283 | cmd_complete(cmd); | |
1284 | ||
1285 | /* Advance to next entry or wrap and flip the toggle bit */ | |
1286 | if (hrrq_curr < hrrq_end) | |
1287 | hrrq_curr++; | |
1288 | else { | |
1289 | hrrq_curr = hrrq_start; | |
1290 | toggle ^= SISL_RESP_HANDLE_T_BIT; | |
1291 | } | |
1292 | } | |
1293 | ||
1294 | afu->hrrq_curr = hrrq_curr; | |
1295 | afu->toggle = toggle; | |
1296 | ||
1297 | return IRQ_HANDLED; | |
1298 | } | |
1299 | ||
1300 | /** | |
1301 | * cxlflash_async_err_irq() - interrupt handler for asynchronous errors | |
1302 | * @irq: Interrupt number. | |
1303 | * @data: Private data provided at interrupt registration, the AFU. | |
1304 | * | |
1305 | * Return: Always return IRQ_HANDLED. | |
1306 | */ | |
1307 | static irqreturn_t cxlflash_async_err_irq(int irq, void *data) | |
1308 | { | |
1309 | struct afu *afu = (struct afu *)data; | |
4392ba49 MO |
1310 | struct cxlflash_cfg *cfg = afu->parent; |
1311 | struct device *dev = &cfg->dev->dev; | |
c21e0bbf MO |
1312 | u64 reg_unmasked; |
1313 | const struct asyc_intr_info *info; | |
1786f4a0 | 1314 | struct sisl_global_map __iomem *global = &afu->afu_map->global; |
c21e0bbf MO |
1315 | u64 reg; |
1316 | u8 port; | |
1317 | int i; | |
1318 | ||
c21e0bbf MO |
1319 | reg = readq_be(&global->regs.aintr_status); |
1320 | reg_unmasked = (reg & SISL_ASTATUS_UNMASK); | |
1321 | ||
1322 | if (reg_unmasked == 0) { | |
4392ba49 MO |
1323 | dev_err(dev, "%s: spurious interrupt, aintr_status 0x%016llX\n", |
1324 | __func__, reg); | |
c21e0bbf MO |
1325 | goto out; |
1326 | } | |
1327 | ||
f15fbf8d | 1328 | /* FYI, it is 'okay' to clear AFU status before FC_ERROR */ |
c21e0bbf MO |
1329 | writeq_be(reg_unmasked, &global->regs.aintr_clear); |
1330 | ||
f15fbf8d | 1331 | /* Check each bit that is on */ |
c21e0bbf MO |
1332 | for (i = 0; reg_unmasked; i++, reg_unmasked = (reg_unmasked >> 1)) { |
1333 | info = find_ainfo(1ULL << i); | |
16798d34 | 1334 | if (((reg_unmasked & 0x1) == 0) || !info) |
c21e0bbf MO |
1335 | continue; |
1336 | ||
1337 | port = info->port; | |
1338 | ||
4392ba49 MO |
1339 | dev_err(dev, "%s: FC Port %d -> %s, fc_status 0x%08llX\n", |
1340 | __func__, port, info->desc, | |
c21e0bbf MO |
1341 | readq_be(&global->fc_regs[port][FC_STATUS / 8])); |
1342 | ||
1343 | /* | |
f15fbf8d | 1344 | * Do link reset first, some OTHER errors will set FC_ERROR |
c21e0bbf MO |
1345 | * again if cleared before or w/o a reset |
1346 | */ | |
1347 | if (info->action & LINK_RESET) { | |
4392ba49 MO |
1348 | dev_err(dev, "%s: FC Port %d: resetting link\n", |
1349 | __func__, port); | |
c21e0bbf MO |
1350 | cfg->lr_state = LINK_RESET_REQUIRED; |
1351 | cfg->lr_port = port; | |
b45cdbaf | 1352 | kref_get(&cfg->afu->mapcount); |
c21e0bbf MO |
1353 | schedule_work(&cfg->work_q); |
1354 | } | |
1355 | ||
1356 | if (info->action & CLR_FC_ERROR) { | |
1357 | reg = readq_be(&global->fc_regs[port][FC_ERROR / 8]); | |
1358 | ||
1359 | /* | |
f15fbf8d | 1360 | * Since all errors are unmasked, FC_ERROR and FC_ERRCAP |
c21e0bbf MO |
1361 | * should be the same and tracing one is sufficient. |
1362 | */ | |
1363 | ||
4392ba49 MO |
1364 | dev_err(dev, "%s: fc %d: clearing fc_error 0x%08llX\n", |
1365 | __func__, port, reg); | |
c21e0bbf MO |
1366 | |
1367 | writeq_be(reg, &global->fc_regs[port][FC_ERROR / 8]); | |
1368 | writeq_be(0, &global->fc_regs[port][FC_ERRCAP / 8]); | |
1369 | } | |
ef51074a MO |
1370 | |
1371 | if (info->action & SCAN_HOST) { | |
1372 | atomic_inc(&cfg->scan_host_needed); | |
b45cdbaf | 1373 | kref_get(&cfg->afu->mapcount); |
ef51074a MO |
1374 | schedule_work(&cfg->work_q); |
1375 | } | |
c21e0bbf MO |
1376 | } |
1377 | ||
1378 | out: | |
4392ba49 | 1379 | dev_dbg(dev, "%s: returning IRQ_HANDLED, afu=%p\n", __func__, afu); |
c21e0bbf MO |
1380 | return IRQ_HANDLED; |
1381 | } | |
1382 | ||
1383 | /** | |
1384 | * start_context() - starts the master context | |
1284fb0c | 1385 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1386 | * |
1387 | * Return: A success or failure value from CXL services. | |
1388 | */ | |
1389 | static int start_context(struct cxlflash_cfg *cfg) | |
1390 | { | |
1391 | int rc = 0; | |
1392 | ||
1393 | rc = cxl_start_context(cfg->mcctx, | |
1394 | cfg->afu->work.work_element_descriptor, | |
1395 | NULL); | |
1396 | ||
1397 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1398 | return rc; | |
1399 | } | |
1400 | ||
1401 | /** | |
1402 | * read_vpd() - obtains the WWPNs from VPD | |
1284fb0c | 1403 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1404 | * @wwpn: Array of size NUM_FC_PORTS to pass back WWPNs |
1405 | * | |
1284fb0c | 1406 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
1407 | */ |
1408 | static int read_vpd(struct cxlflash_cfg *cfg, u64 wwpn[]) | |
1409 | { | |
1410 | struct pci_dev *dev = cfg->parent_dev; | |
1411 | int rc = 0; | |
1412 | int ro_start, ro_size, i, j, k; | |
1413 | ssize_t vpd_size; | |
1414 | char vpd_data[CXLFLASH_VPD_LEN]; | |
1415 | char tmp_buf[WWPN_BUF_LEN] = { 0 }; | |
1416 | char *wwpn_vpd_tags[NUM_FC_PORTS] = { "V5", "V6" }; | |
1417 | ||
1418 | /* Get the VPD data from the device */ | |
1419 | vpd_size = pci_read_vpd(dev, 0, sizeof(vpd_data), vpd_data); | |
1420 | if (unlikely(vpd_size <= 0)) { | |
4392ba49 | 1421 | dev_err(&dev->dev, "%s: Unable to read VPD (size = %ld)\n", |
c21e0bbf MO |
1422 | __func__, vpd_size); |
1423 | rc = -ENODEV; | |
1424 | goto out; | |
1425 | } | |
1426 | ||
1427 | /* Get the read only section offset */ | |
1428 | ro_start = pci_vpd_find_tag(vpd_data, 0, vpd_size, | |
1429 | PCI_VPD_LRDT_RO_DATA); | |
1430 | if (unlikely(ro_start < 0)) { | |
4392ba49 MO |
1431 | dev_err(&dev->dev, "%s: VPD Read-only data not found\n", |
1432 | __func__); | |
c21e0bbf MO |
1433 | rc = -ENODEV; |
1434 | goto out; | |
1435 | } | |
1436 | ||
1437 | /* Get the read only section size, cap when extends beyond read VPD */ | |
1438 | ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]); | |
1439 | j = ro_size; | |
1440 | i = ro_start + PCI_VPD_LRDT_TAG_SIZE; | |
1441 | if (unlikely((i + j) > vpd_size)) { | |
1442 | pr_debug("%s: Might need to read more VPD (%d > %ld)\n", | |
1443 | __func__, (i + j), vpd_size); | |
1444 | ro_size = vpd_size - i; | |
1445 | } | |
1446 | ||
1447 | /* | |
1448 | * Find the offset of the WWPN tag within the read only | |
1449 | * VPD data and validate the found field (partials are | |
1450 | * no good to us). Convert the ASCII data to an integer | |
1451 | * value. Note that we must copy to a temporary buffer | |
1452 | * because the conversion service requires that the ASCII | |
1453 | * string be terminated. | |
1454 | */ | |
1455 | for (k = 0; k < NUM_FC_PORTS; k++) { | |
1456 | j = ro_size; | |
1457 | i = ro_start + PCI_VPD_LRDT_TAG_SIZE; | |
1458 | ||
1459 | i = pci_vpd_find_info_keyword(vpd_data, i, j, wwpn_vpd_tags[k]); | |
1460 | if (unlikely(i < 0)) { | |
4392ba49 MO |
1461 | dev_err(&dev->dev, "%s: Port %d WWPN not found " |
1462 | "in VPD\n", __func__, k); | |
c21e0bbf MO |
1463 | rc = -ENODEV; |
1464 | goto out; | |
1465 | } | |
1466 | ||
1467 | j = pci_vpd_info_field_size(&vpd_data[i]); | |
1468 | i += PCI_VPD_INFO_FLD_HDR_SIZE; | |
1469 | if (unlikely((i + j > vpd_size) || (j != WWPN_LEN))) { | |
4392ba49 MO |
1470 | dev_err(&dev->dev, "%s: Port %d WWPN incomplete or " |
1471 | "VPD corrupt\n", | |
c21e0bbf MO |
1472 | __func__, k); |
1473 | rc = -ENODEV; | |
1474 | goto out; | |
1475 | } | |
1476 | ||
1477 | memcpy(tmp_buf, &vpd_data[i], WWPN_LEN); | |
1478 | rc = kstrtoul(tmp_buf, WWPN_LEN, (ulong *)&wwpn[k]); | |
1479 | if (unlikely(rc)) { | |
4392ba49 MO |
1480 | dev_err(&dev->dev, "%s: Fail to convert port %d WWPN " |
1481 | "to integer\n", __func__, k); | |
c21e0bbf MO |
1482 | rc = -ENODEV; |
1483 | goto out; | |
1484 | } | |
1485 | } | |
1486 | ||
1487 | out: | |
1488 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1489 | return rc; | |
1490 | } | |
1491 | ||
1492 | /** | |
15305514 | 1493 | * init_pcr() - initialize the provisioning and control registers |
1284fb0c | 1494 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 1495 | * |
15305514 MO |
1496 | * Also sets up fast access to the mapped registers and initializes AFU |
1497 | * command fields that never change. | |
c21e0bbf | 1498 | */ |
15305514 | 1499 | static void init_pcr(struct cxlflash_cfg *cfg) |
c21e0bbf MO |
1500 | { |
1501 | struct afu *afu = cfg->afu; | |
1786f4a0 | 1502 | struct sisl_ctrl_map __iomem *ctrl_map; |
c21e0bbf MO |
1503 | int i; |
1504 | ||
1505 | for (i = 0; i < MAX_CONTEXT; i++) { | |
1506 | ctrl_map = &afu->afu_map->ctrls[i].ctrl; | |
f15fbf8d MO |
1507 | /* Disrupt any clients that could be running */ |
1508 | /* e.g. clients that survived a master restart */ | |
c21e0bbf MO |
1509 | writeq_be(0, &ctrl_map->rht_start); |
1510 | writeq_be(0, &ctrl_map->rht_cnt_id); | |
1511 | writeq_be(0, &ctrl_map->ctx_cap); | |
1512 | } | |
1513 | ||
f15fbf8d | 1514 | /* Copy frequently used fields into afu */ |
c21e0bbf | 1515 | afu->ctx_hndl = (u16) cxl_process_element(cfg->mcctx); |
c21e0bbf MO |
1516 | afu->host_map = &afu->afu_map->hosts[afu->ctx_hndl].host; |
1517 | afu->ctrl_map = &afu->afu_map->ctrls[afu->ctx_hndl].ctrl; | |
1518 | ||
1519 | /* Program the Endian Control for the master context */ | |
1520 | writeq_be(SISL_ENDIAN_CTRL, &afu->host_map->endian_ctrl); | |
1521 | ||
f15fbf8d | 1522 | /* Initialize cmd fields that never change */ |
c21e0bbf MO |
1523 | for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { |
1524 | afu->cmd[i].rcb.ctx_id = afu->ctx_hndl; | |
1525 | afu->cmd[i].rcb.msi = SISL_MSI_RRQ_UPDATED; | |
1526 | afu->cmd[i].rcb.rrq = 0x0; | |
1527 | } | |
1528 | } | |
1529 | ||
1530 | /** | |
1531 | * init_global() - initialize AFU global registers | |
1284fb0c | 1532 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 1533 | */ |
15305514 | 1534 | static int init_global(struct cxlflash_cfg *cfg) |
c21e0bbf MO |
1535 | { |
1536 | struct afu *afu = cfg->afu; | |
4392ba49 | 1537 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
1538 | u64 wwpn[NUM_FC_PORTS]; /* wwpn of AFU ports */ |
1539 | int i = 0, num_ports = 0; | |
1540 | int rc = 0; | |
1541 | u64 reg; | |
1542 | ||
1543 | rc = read_vpd(cfg, &wwpn[0]); | |
1544 | if (rc) { | |
4392ba49 | 1545 | dev_err(dev, "%s: could not read vpd rc=%d\n", __func__, rc); |
c21e0bbf MO |
1546 | goto out; |
1547 | } | |
1548 | ||
1549 | pr_debug("%s: wwpn0=0x%llX wwpn1=0x%llX\n", __func__, wwpn[0], wwpn[1]); | |
1550 | ||
f15fbf8d | 1551 | /* Set up RRQ in AFU for master issued cmds */ |
c21e0bbf MO |
1552 | writeq_be((u64) afu->hrrq_start, &afu->host_map->rrq_start); |
1553 | writeq_be((u64) afu->hrrq_end, &afu->host_map->rrq_end); | |
1554 | ||
1555 | /* AFU configuration */ | |
1556 | reg = readq_be(&afu->afu_map->global.regs.afu_config); | |
1557 | reg |= SISL_AFUCONF_AR_ALL|SISL_AFUCONF_ENDIAN; | |
1558 | /* enable all auto retry options and control endianness */ | |
1559 | /* leave others at default: */ | |
1560 | /* CTX_CAP write protected, mbox_r does not clear on read and */ | |
1561 | /* checker on if dual afu */ | |
1562 | writeq_be(reg, &afu->afu_map->global.regs.afu_config); | |
1563 | ||
f15fbf8d | 1564 | /* Global port select: select either port */ |
c21e0bbf | 1565 | if (afu->internal_lun) { |
f15fbf8d | 1566 | /* Only use port 0 */ |
c21e0bbf MO |
1567 | writeq_be(PORT0, &afu->afu_map->global.regs.afu_port_sel); |
1568 | num_ports = NUM_FC_PORTS - 1; | |
1569 | } else { | |
1570 | writeq_be(BOTH_PORTS, &afu->afu_map->global.regs.afu_port_sel); | |
1571 | num_ports = NUM_FC_PORTS; | |
1572 | } | |
1573 | ||
1574 | for (i = 0; i < num_ports; i++) { | |
f15fbf8d | 1575 | /* Unmask all errors (but they are still masked at AFU) */ |
c21e0bbf | 1576 | writeq_be(0, &afu->afu_map->global.fc_regs[i][FC_ERRMSK / 8]); |
f15fbf8d | 1577 | /* Clear CRC error cnt & set a threshold */ |
c21e0bbf MO |
1578 | (void)readq_be(&afu->afu_map->global. |
1579 | fc_regs[i][FC_CNT_CRCERR / 8]); | |
1580 | writeq_be(MC_CRC_THRESH, &afu->afu_map->global.fc_regs[i] | |
1581 | [FC_CRC_THRESH / 8]); | |
1582 | ||
f15fbf8d | 1583 | /* Set WWPNs. If already programmed, wwpn[i] is 0 */ |
c21e0bbf MO |
1584 | if (wwpn[i] != 0 && |
1585 | afu_set_wwpn(afu, i, | |
1586 | &afu->afu_map->global.fc_regs[i][0], | |
1587 | wwpn[i])) { | |
4392ba49 | 1588 | dev_err(dev, "%s: failed to set WWPN on port %d\n", |
c21e0bbf MO |
1589 | __func__, i); |
1590 | rc = -EIO; | |
1591 | goto out; | |
1592 | } | |
1593 | /* Programming WWPN back to back causes additional | |
1594 | * offline/online transitions and a PLOGI | |
1595 | */ | |
1596 | msleep(100); | |
c21e0bbf MO |
1597 | } |
1598 | ||
f15fbf8d MO |
1599 | /* Set up master's own CTX_CAP to allow real mode, host translation */ |
1600 | /* tables, afu cmds and read/write GSCSI cmds. */ | |
c21e0bbf MO |
1601 | /* First, unlock ctx_cap write by reading mbox */ |
1602 | (void)readq_be(&afu->ctrl_map->mbox_r); /* unlock ctx_cap */ | |
1603 | writeq_be((SISL_CTX_CAP_REAL_MODE | SISL_CTX_CAP_HOST_XLATE | | |
1604 | SISL_CTX_CAP_READ_CMD | SISL_CTX_CAP_WRITE_CMD | | |
1605 | SISL_CTX_CAP_AFU_CMD | SISL_CTX_CAP_GSCSI_CMD), | |
1606 | &afu->ctrl_map->ctx_cap); | |
f15fbf8d | 1607 | /* Initialize heartbeat */ |
c21e0bbf MO |
1608 | afu->hb = readq_be(&afu->afu_map->global.regs.afu_hb); |
1609 | ||
1610 | out: | |
1611 | return rc; | |
1612 | } | |
1613 | ||
1614 | /** | |
1615 | * start_afu() - initializes and starts the AFU | |
1284fb0c | 1616 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1617 | */ |
1618 | static int start_afu(struct cxlflash_cfg *cfg) | |
1619 | { | |
1620 | struct afu *afu = cfg->afu; | |
1621 | struct afu_cmd *cmd; | |
1622 | ||
1623 | int i = 0; | |
1624 | int rc = 0; | |
1625 | ||
1626 | for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { | |
1627 | cmd = &afu->cmd[i]; | |
1628 | ||
1629 | init_completion(&cmd->cevent); | |
1630 | spin_lock_init(&cmd->slock); | |
1631 | cmd->parent = afu; | |
1632 | } | |
1633 | ||
1634 | init_pcr(cfg); | |
1635 | ||
af10483e MO |
1636 | /* After an AFU reset, RRQ entries are stale, clear them */ |
1637 | memset(&afu->rrq_entry, 0, sizeof(afu->rrq_entry)); | |
1638 | ||
f15fbf8d | 1639 | /* Initialize RRQ pointers */ |
c21e0bbf MO |
1640 | afu->hrrq_start = &afu->rrq_entry[0]; |
1641 | afu->hrrq_end = &afu->rrq_entry[NUM_RRQ_ENTRY - 1]; | |
1642 | afu->hrrq_curr = afu->hrrq_start; | |
1643 | afu->toggle = 1; | |
1644 | ||
1645 | rc = init_global(cfg); | |
1646 | ||
1647 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1648 | return rc; | |
1649 | } | |
1650 | ||
1651 | /** | |
1652 | * init_mc() - create and register as the master context | |
1284fb0c | 1653 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 1654 | * |
1284fb0c | 1655 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
1656 | */ |
1657 | static int init_mc(struct cxlflash_cfg *cfg) | |
1658 | { | |
1659 | struct cxl_context *ctx; | |
1660 | struct device *dev = &cfg->dev->dev; | |
1661 | struct afu *afu = cfg->afu; | |
1662 | int rc = 0; | |
1663 | enum undo_level level; | |
1664 | ||
1665 | ctx = cxl_get_context(cfg->dev); | |
1666 | if (unlikely(!ctx)) | |
1667 | return -ENOMEM; | |
1668 | cfg->mcctx = ctx; | |
1669 | ||
1670 | /* Set it up as a master with the CXL */ | |
1671 | cxl_set_master(ctx); | |
1672 | ||
1673 | /* During initialization reset the AFU to start from a clean slate */ | |
1674 | rc = cxl_afu_reset(cfg->mcctx); | |
1675 | if (unlikely(rc)) { | |
1676 | dev_err(dev, "%s: initial AFU reset failed rc=%d\n", | |
1677 | __func__, rc); | |
1678 | level = RELEASE_CONTEXT; | |
1679 | goto out; | |
1680 | } | |
1681 | ||
1682 | rc = cxl_allocate_afu_irqs(ctx, 3); | |
1683 | if (unlikely(rc)) { | |
1684 | dev_err(dev, "%s: call to allocate_afu_irqs failed rc=%d!\n", | |
1685 | __func__, rc); | |
1686 | level = RELEASE_CONTEXT; | |
1687 | goto out; | |
1688 | } | |
1689 | ||
1690 | rc = cxl_map_afu_irq(ctx, 1, cxlflash_sync_err_irq, afu, | |
1691 | "SISL_MSI_SYNC_ERROR"); | |
1692 | if (unlikely(rc <= 0)) { | |
1693 | dev_err(dev, "%s: IRQ 1 (SISL_MSI_SYNC_ERROR) map failed!\n", | |
1694 | __func__); | |
1695 | level = FREE_IRQ; | |
1696 | goto out; | |
1697 | } | |
1698 | ||
1699 | rc = cxl_map_afu_irq(ctx, 2, cxlflash_rrq_irq, afu, | |
1700 | "SISL_MSI_RRQ_UPDATED"); | |
1701 | if (unlikely(rc <= 0)) { | |
1702 | dev_err(dev, "%s: IRQ 2 (SISL_MSI_RRQ_UPDATED) map failed!\n", | |
1703 | __func__); | |
1704 | level = UNMAP_ONE; | |
1705 | goto out; | |
1706 | } | |
1707 | ||
1708 | rc = cxl_map_afu_irq(ctx, 3, cxlflash_async_err_irq, afu, | |
1709 | "SISL_MSI_ASYNC_ERROR"); | |
1710 | if (unlikely(rc <= 0)) { | |
1711 | dev_err(dev, "%s: IRQ 3 (SISL_MSI_ASYNC_ERROR) map failed!\n", | |
1712 | __func__); | |
1713 | level = UNMAP_TWO; | |
1714 | goto out; | |
1715 | } | |
1716 | ||
1717 | rc = 0; | |
1718 | ||
1719 | /* This performs the equivalent of the CXL_IOCTL_START_WORK. | |
1720 | * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process | |
1721 | * element (pe) that is embedded in the context (ctx) | |
1722 | */ | |
1723 | rc = start_context(cfg); | |
1724 | if (unlikely(rc)) { | |
1725 | dev_err(dev, "%s: start context failed rc=%d\n", __func__, rc); | |
1726 | level = UNMAP_THREE; | |
1727 | goto out; | |
1728 | } | |
1729 | ret: | |
1730 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1731 | return rc; | |
1732 | out: | |
1733 | term_mc(cfg, level); | |
1734 | goto ret; | |
1735 | } | |
1736 | ||
1737 | /** | |
1738 | * init_afu() - setup as master context and start AFU | |
1284fb0c | 1739 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1740 | * |
1741 | * This routine is a higher level of control for configuring the | |
1742 | * AFU on probe and reset paths. | |
1743 | * | |
1284fb0c | 1744 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
1745 | */ |
1746 | static int init_afu(struct cxlflash_cfg *cfg) | |
1747 | { | |
1748 | u64 reg; | |
1749 | int rc = 0; | |
1750 | struct afu *afu = cfg->afu; | |
1751 | struct device *dev = &cfg->dev->dev; | |
1752 | ||
5cdac81a MO |
1753 | cxl_perst_reloads_same_image(cfg->cxl_afu, true); |
1754 | ||
c21e0bbf MO |
1755 | rc = init_mc(cfg); |
1756 | if (rc) { | |
1757 | dev_err(dev, "%s: call to init_mc failed, rc=%d!\n", | |
1758 | __func__, rc); | |
ee3491ba | 1759 | goto out; |
c21e0bbf MO |
1760 | } |
1761 | ||
f15fbf8d | 1762 | /* Map the entire MMIO space of the AFU */ |
c21e0bbf MO |
1763 | afu->afu_map = cxl_psa_map(cfg->mcctx); |
1764 | if (!afu->afu_map) { | |
c21e0bbf | 1765 | dev_err(dev, "%s: call to cxl_psa_map failed!\n", __func__); |
ee3491ba | 1766 | rc = -ENOMEM; |
c21e0bbf MO |
1767 | goto err1; |
1768 | } | |
b45cdbaf | 1769 | kref_init(&afu->mapcount); |
c21e0bbf | 1770 | |
e5ce067b MO |
1771 | /* No byte reverse on reading afu_version or string will be backwards */ |
1772 | reg = readq(&afu->afu_map->global.regs.afu_version); | |
1773 | memcpy(afu->version, ®, sizeof(reg)); | |
c21e0bbf MO |
1774 | afu->interface_version = |
1775 | readq_be(&afu->afu_map->global.regs.interface_version); | |
e5ce067b MO |
1776 | if ((afu->interface_version + 1) == 0) { |
1777 | pr_err("Back level AFU, please upgrade. AFU version %s " | |
1778 | "interface version 0x%llx\n", afu->version, | |
1779 | afu->interface_version); | |
1780 | rc = -EINVAL; | |
ee3491ba MO |
1781 | goto err2; |
1782 | } | |
1783 | ||
1784 | pr_debug("%s: afu version %s, interface version 0x%llX\n", __func__, | |
1785 | afu->version, afu->interface_version); | |
c21e0bbf MO |
1786 | |
1787 | rc = start_afu(cfg); | |
1788 | if (rc) { | |
1789 | dev_err(dev, "%s: call to start_afu failed, rc=%d!\n", | |
1790 | __func__, rc); | |
ee3491ba | 1791 | goto err2; |
c21e0bbf MO |
1792 | } |
1793 | ||
1794 | afu_err_intr_init(cfg->afu); | |
1795 | atomic64_set(&afu->room, readq_be(&afu->host_map->cmd_room)); | |
1796 | ||
2cb79266 MO |
1797 | /* Restore the LUN mappings */ |
1798 | cxlflash_restore_luntable(cfg); | |
ee3491ba | 1799 | out: |
c21e0bbf MO |
1800 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
1801 | return rc; | |
ee3491ba MO |
1802 | |
1803 | err2: | |
b45cdbaf | 1804 | kref_put(&afu->mapcount, afu_unmap); |
ee3491ba MO |
1805 | err1: |
1806 | term_mc(cfg, UNDO_START); | |
1807 | goto out; | |
c21e0bbf MO |
1808 | } |
1809 | ||
c21e0bbf MO |
1810 | /** |
1811 | * cxlflash_afu_sync() - builds and sends an AFU sync command | |
1812 | * @afu: AFU associated with the host. | |
1813 | * @ctx_hndl_u: Identifies context requesting sync. | |
1814 | * @res_hndl_u: Identifies resource requesting sync. | |
1815 | * @mode: Type of sync to issue (lightweight, heavyweight, global). | |
1816 | * | |
1817 | * The AFU can only take 1 sync command at a time. This routine enforces this | |
f15fbf8d | 1818 | * limitation by using a mutex to provide exclusive access to the AFU during |
c21e0bbf MO |
1819 | * the sync. This design point requires calling threads to not be on interrupt |
1820 | * context due to the possibility of sleeping during concurrent sync operations. | |
1821 | * | |
5cdac81a MO |
1822 | * AFU sync operations are only necessary and allowed when the device is |
1823 | * operating normally. When not operating normally, sync requests can occur as | |
1824 | * part of cleaning up resources associated with an adapter prior to removal. | |
1825 | * In this scenario, these requests are simply ignored (safe due to the AFU | |
1826 | * going away). | |
1827 | * | |
c21e0bbf MO |
1828 | * Return: |
1829 | * 0 on success | |
1830 | * -1 on failure | |
1831 | */ | |
1832 | int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t ctx_hndl_u, | |
1833 | res_hndl_t res_hndl_u, u8 mode) | |
1834 | { | |
5cdac81a | 1835 | struct cxlflash_cfg *cfg = afu->parent; |
4392ba49 | 1836 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
1837 | struct afu_cmd *cmd = NULL; |
1838 | int rc = 0; | |
1839 | int retry_cnt = 0; | |
1840 | static DEFINE_MUTEX(sync_active); | |
1841 | ||
5cdac81a MO |
1842 | if (cfg->state != STATE_NORMAL) { |
1843 | pr_debug("%s: Sync not required! (%u)\n", __func__, cfg->state); | |
1844 | return 0; | |
1845 | } | |
1846 | ||
c21e0bbf MO |
1847 | mutex_lock(&sync_active); |
1848 | retry: | |
15305514 | 1849 | cmd = cmd_checkout(afu); |
c21e0bbf MO |
1850 | if (unlikely(!cmd)) { |
1851 | retry_cnt++; | |
1852 | udelay(1000 * retry_cnt); | |
1853 | if (retry_cnt < MC_RETRY_CNT) | |
1854 | goto retry; | |
4392ba49 | 1855 | dev_err(dev, "%s: could not get a free command\n", __func__); |
c21e0bbf MO |
1856 | rc = -1; |
1857 | goto out; | |
1858 | } | |
1859 | ||
1860 | pr_debug("%s: afu=%p cmd=%p %d\n", __func__, afu, cmd, ctx_hndl_u); | |
1861 | ||
1862 | memset(cmd->rcb.cdb, 0, sizeof(cmd->rcb.cdb)); | |
1863 | ||
1864 | cmd->rcb.req_flags = SISL_REQ_FLAGS_AFU_CMD; | |
1865 | cmd->rcb.port_sel = 0x0; /* NA */ | |
1866 | cmd->rcb.lun_id = 0x0; /* NA */ | |
1867 | cmd->rcb.data_len = 0x0; | |
1868 | cmd->rcb.data_ea = 0x0; | |
1869 | cmd->rcb.timeout = MC_AFU_SYNC_TIMEOUT; | |
1870 | ||
1871 | cmd->rcb.cdb[0] = 0xC0; /* AFU Sync */ | |
1872 | cmd->rcb.cdb[1] = mode; | |
1873 | ||
1874 | /* The cdb is aligned, no unaligned accessors required */ | |
1786f4a0 MO |
1875 | *((__be16 *)&cmd->rcb.cdb[2]) = cpu_to_be16(ctx_hndl_u); |
1876 | *((__be32 *)&cmd->rcb.cdb[4]) = cpu_to_be32(res_hndl_u); | |
c21e0bbf | 1877 | |
15305514 | 1878 | rc = send_cmd(afu, cmd); |
c21e0bbf MO |
1879 | if (unlikely(rc)) |
1880 | goto out; | |
1881 | ||
15305514 | 1882 | wait_resp(afu, cmd); |
c21e0bbf | 1883 | |
f15fbf8d | 1884 | /* Set on timeout */ |
c21e0bbf MO |
1885 | if (unlikely((cmd->sa.ioasc != 0) || |
1886 | (cmd->sa.host_use_b[0] & B_ERROR))) | |
1887 | rc = -1; | |
1888 | out: | |
1889 | mutex_unlock(&sync_active); | |
1890 | if (cmd) | |
15305514 | 1891 | cmd_checkin(cmd); |
c21e0bbf MO |
1892 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
1893 | return rc; | |
1894 | } | |
1895 | ||
1896 | /** | |
15305514 MO |
1897 | * afu_reset() - resets the AFU |
1898 | * @cfg: Internal structure associated with the host. | |
c21e0bbf | 1899 | * |
1284fb0c | 1900 | * Return: 0 on success, -errno on failure |
c21e0bbf | 1901 | */ |
15305514 | 1902 | static int afu_reset(struct cxlflash_cfg *cfg) |
c21e0bbf MO |
1903 | { |
1904 | int rc = 0; | |
1905 | /* Stop the context before the reset. Since the context is | |
1906 | * no longer available restart it after the reset is complete | |
1907 | */ | |
1908 | ||
1909 | term_afu(cfg); | |
1910 | ||
1911 | rc = init_afu(cfg); | |
1912 | ||
1913 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1914 | return rc; | |
1915 | } | |
1916 | ||
15305514 MO |
1917 | /** |
1918 | * cxlflash_eh_device_reset_handler() - reset a single LUN | |
1919 | * @scp: SCSI command to send. | |
1920 | * | |
1921 | * Return: | |
1922 | * SUCCESS as defined in scsi/scsi.h | |
1923 | * FAILED as defined in scsi/scsi.h | |
1924 | */ | |
1925 | static int cxlflash_eh_device_reset_handler(struct scsi_cmnd *scp) | |
1926 | { | |
1927 | int rc = SUCCESS; | |
1928 | struct Scsi_Host *host = scp->device->host; | |
1929 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; | |
1930 | struct afu *afu = cfg->afu; | |
1931 | int rcr = 0; | |
1932 | ||
1933 | pr_debug("%s: (scp=%p) %d/%d/%d/%llu " | |
1934 | "cdb=(%08X-%08X-%08X-%08X)\n", __func__, scp, | |
1935 | host->host_no, scp->device->channel, | |
1936 | scp->device->id, scp->device->lun, | |
1937 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
1938 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
1939 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
1940 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
1941 | ||
ed486daa | 1942 | retry: |
15305514 MO |
1943 | switch (cfg->state) { |
1944 | case STATE_NORMAL: | |
1945 | rcr = send_tmf(afu, scp, TMF_LUN_RESET); | |
1946 | if (unlikely(rcr)) | |
1947 | rc = FAILED; | |
1948 | break; | |
1949 | case STATE_RESET: | |
1950 | wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); | |
ed486daa | 1951 | goto retry; |
15305514 MO |
1952 | default: |
1953 | rc = FAILED; | |
1954 | break; | |
1955 | } | |
1956 | ||
1957 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1958 | return rc; | |
1959 | } | |
1960 | ||
1961 | /** | |
1962 | * cxlflash_eh_host_reset_handler() - reset the host adapter | |
1963 | * @scp: SCSI command from stack identifying host. | |
1964 | * | |
1965 | * Return: | |
1966 | * SUCCESS as defined in scsi/scsi.h | |
1967 | * FAILED as defined in scsi/scsi.h | |
1968 | */ | |
1969 | static int cxlflash_eh_host_reset_handler(struct scsi_cmnd *scp) | |
1970 | { | |
1971 | int rc = SUCCESS; | |
1972 | int rcr = 0; | |
1973 | struct Scsi_Host *host = scp->device->host; | |
1974 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; | |
1975 | ||
1976 | pr_debug("%s: (scp=%p) %d/%d/%d/%llu " | |
1977 | "cdb=(%08X-%08X-%08X-%08X)\n", __func__, scp, | |
1978 | host->host_no, scp->device->channel, | |
1979 | scp->device->id, scp->device->lun, | |
1980 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
1981 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
1982 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
1983 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
1984 | ||
1985 | switch (cfg->state) { | |
1986 | case STATE_NORMAL: | |
1987 | cfg->state = STATE_RESET; | |
15305514 MO |
1988 | cxlflash_mark_contexts_error(cfg); |
1989 | rcr = afu_reset(cfg); | |
1990 | if (rcr) { | |
1991 | rc = FAILED; | |
1992 | cfg->state = STATE_FAILTERM; | |
1993 | } else | |
1994 | cfg->state = STATE_NORMAL; | |
1995 | wake_up_all(&cfg->reset_waitq); | |
15305514 MO |
1996 | break; |
1997 | case STATE_RESET: | |
1998 | wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); | |
1999 | if (cfg->state == STATE_NORMAL) | |
2000 | break; | |
2001 | /* fall through */ | |
2002 | default: | |
2003 | rc = FAILED; | |
2004 | break; | |
2005 | } | |
2006 | ||
2007 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
2008 | return rc; | |
2009 | } | |
2010 | ||
2011 | /** | |
2012 | * cxlflash_change_queue_depth() - change the queue depth for the device | |
2013 | * @sdev: SCSI device destined for queue depth change. | |
2014 | * @qdepth: Requested queue depth value to set. | |
2015 | * | |
2016 | * The requested queue depth is capped to the maximum supported value. | |
2017 | * | |
2018 | * Return: The actual queue depth set. | |
2019 | */ | |
2020 | static int cxlflash_change_queue_depth(struct scsi_device *sdev, int qdepth) | |
2021 | { | |
2022 | ||
2023 | if (qdepth > CXLFLASH_MAX_CMDS_PER_LUN) | |
2024 | qdepth = CXLFLASH_MAX_CMDS_PER_LUN; | |
2025 | ||
2026 | scsi_change_queue_depth(sdev, qdepth); | |
2027 | return sdev->queue_depth; | |
2028 | } | |
2029 | ||
2030 | /** | |
2031 | * cxlflash_show_port_status() - queries and presents the current port status | |
e0f01a21 MO |
2032 | * @port: Desired port for status reporting. |
2033 | * @afu: AFU owning the specified port. | |
15305514 MO |
2034 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. |
2035 | * | |
2036 | * Return: The size of the ASCII string returned in @buf. | |
2037 | */ | |
e0f01a21 | 2038 | static ssize_t cxlflash_show_port_status(u32 port, struct afu *afu, char *buf) |
15305514 | 2039 | { |
15305514 | 2040 | char *disp_status; |
15305514 | 2041 | u64 status; |
e0f01a21 | 2042 | __be64 __iomem *fc_regs; |
15305514 | 2043 | |
e0f01a21 | 2044 | if (port >= NUM_FC_PORTS) |
15305514 MO |
2045 | return 0; |
2046 | ||
2047 | fc_regs = &afu->afu_map->global.fc_regs[port][0]; | |
e0f01a21 MO |
2048 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); |
2049 | status &= FC_MTIP_STATUS_MASK; | |
15305514 MO |
2050 | |
2051 | if (status == FC_MTIP_STATUS_ONLINE) | |
2052 | disp_status = "online"; | |
2053 | else if (status == FC_MTIP_STATUS_OFFLINE) | |
2054 | disp_status = "offline"; | |
2055 | else | |
2056 | disp_status = "unknown"; | |
2057 | ||
e0f01a21 MO |
2058 | return scnprintf(buf, PAGE_SIZE, "%s\n", disp_status); |
2059 | } | |
2060 | ||
2061 | /** | |
2062 | * port0_show() - queries and presents the current status of port 0 | |
2063 | * @dev: Generic device associated with the host owning the port. | |
2064 | * @attr: Device attribute representing the port. | |
2065 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2066 | * | |
2067 | * Return: The size of the ASCII string returned in @buf. | |
2068 | */ | |
2069 | static ssize_t port0_show(struct device *dev, | |
2070 | struct device_attribute *attr, | |
2071 | char *buf) | |
2072 | { | |
2073 | struct Scsi_Host *shost = class_to_shost(dev); | |
2074 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
2075 | struct afu *afu = cfg->afu; | |
2076 | ||
2077 | return cxlflash_show_port_status(0, afu, buf); | |
15305514 MO |
2078 | } |
2079 | ||
2080 | /** | |
e0f01a21 MO |
2081 | * port1_show() - queries and presents the current status of port 1 |
2082 | * @dev: Generic device associated with the host owning the port. | |
2083 | * @attr: Device attribute representing the port. | |
2084 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2085 | * | |
2086 | * Return: The size of the ASCII string returned in @buf. | |
2087 | */ | |
2088 | static ssize_t port1_show(struct device *dev, | |
2089 | struct device_attribute *attr, | |
2090 | char *buf) | |
2091 | { | |
2092 | struct Scsi_Host *shost = class_to_shost(dev); | |
2093 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
2094 | struct afu *afu = cfg->afu; | |
2095 | ||
2096 | return cxlflash_show_port_status(1, afu, buf); | |
2097 | } | |
2098 | ||
2099 | /** | |
2100 | * lun_mode_show() - presents the current LUN mode of the host | |
15305514 | 2101 | * @dev: Generic device associated with the host. |
e0f01a21 | 2102 | * @attr: Device attribute representing the LUN mode. |
15305514 MO |
2103 | * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII. |
2104 | * | |
2105 | * Return: The size of the ASCII string returned in @buf. | |
2106 | */ | |
e0f01a21 MO |
2107 | static ssize_t lun_mode_show(struct device *dev, |
2108 | struct device_attribute *attr, char *buf) | |
15305514 MO |
2109 | { |
2110 | struct Scsi_Host *shost = class_to_shost(dev); | |
2111 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
2112 | struct afu *afu = cfg->afu; | |
2113 | ||
e0f01a21 | 2114 | return scnprintf(buf, PAGE_SIZE, "%u\n", afu->internal_lun); |
15305514 MO |
2115 | } |
2116 | ||
2117 | /** | |
e0f01a21 | 2118 | * lun_mode_store() - sets the LUN mode of the host |
15305514 | 2119 | * @dev: Generic device associated with the host. |
e0f01a21 | 2120 | * @attr: Device attribute representing the LUN mode. |
15305514 MO |
2121 | * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII. |
2122 | * @count: Length of data resizing in @buf. | |
2123 | * | |
2124 | * The CXL Flash AFU supports a dummy LUN mode where the external | |
2125 | * links and storage are not required. Space on the FPGA is used | |
2126 | * to create 1 or 2 small LUNs which are presented to the system | |
2127 | * as if they were a normal storage device. This feature is useful | |
2128 | * during development and also provides manufacturing with a way | |
2129 | * to test the AFU without an actual device. | |
2130 | * | |
2131 | * 0 = external LUN[s] (default) | |
2132 | * 1 = internal LUN (1 x 64K, 512B blocks, id 0) | |
2133 | * 2 = internal LUN (1 x 64K, 4K blocks, id 0) | |
2134 | * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1) | |
2135 | * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1) | |
2136 | * | |
2137 | * Return: The size of the ASCII string returned in @buf. | |
2138 | */ | |
e0f01a21 MO |
2139 | static ssize_t lun_mode_store(struct device *dev, |
2140 | struct device_attribute *attr, | |
2141 | const char *buf, size_t count) | |
15305514 MO |
2142 | { |
2143 | struct Scsi_Host *shost = class_to_shost(dev); | |
2144 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
2145 | struct afu *afu = cfg->afu; | |
2146 | int rc; | |
2147 | u32 lun_mode; | |
2148 | ||
2149 | rc = kstrtouint(buf, 10, &lun_mode); | |
2150 | if (!rc && (lun_mode < 5) && (lun_mode != afu->internal_lun)) { | |
2151 | afu->internal_lun = lun_mode; | |
2152 | afu_reset(cfg); | |
2153 | scsi_scan_host(cfg->host); | |
2154 | } | |
2155 | ||
2156 | return count; | |
2157 | } | |
2158 | ||
2159 | /** | |
e0f01a21 | 2160 | * ioctl_version_show() - presents the current ioctl version of the host |
15305514 MO |
2161 | * @dev: Generic device associated with the host. |
2162 | * @attr: Device attribute representing the ioctl version. | |
2163 | * @buf: Buffer of length PAGE_SIZE to report back the ioctl version. | |
2164 | * | |
2165 | * Return: The size of the ASCII string returned in @buf. | |
2166 | */ | |
e0f01a21 MO |
2167 | static ssize_t ioctl_version_show(struct device *dev, |
2168 | struct device_attribute *attr, char *buf) | |
15305514 MO |
2169 | { |
2170 | return scnprintf(buf, PAGE_SIZE, "%u\n", DK_CXLFLASH_VERSION_0); | |
2171 | } | |
2172 | ||
2173 | /** | |
e0f01a21 MO |
2174 | * cxlflash_show_port_lun_table() - queries and presents the port LUN table |
2175 | * @port: Desired port for status reporting. | |
2176 | * @afu: AFU owning the specified port. | |
2177 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2178 | * | |
2179 | * Return: The size of the ASCII string returned in @buf. | |
2180 | */ | |
2181 | static ssize_t cxlflash_show_port_lun_table(u32 port, | |
2182 | struct afu *afu, | |
2183 | char *buf) | |
2184 | { | |
2185 | int i; | |
2186 | ssize_t bytes = 0; | |
2187 | __be64 __iomem *fc_port; | |
2188 | ||
2189 | if (port >= NUM_FC_PORTS) | |
2190 | return 0; | |
2191 | ||
2192 | fc_port = &afu->afu_map->global.fc_port[port][0]; | |
2193 | ||
2194 | for (i = 0; i < CXLFLASH_NUM_VLUNS; i++) | |
2195 | bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes, | |
2196 | "%03d: %016llX\n", i, readq_be(&fc_port[i])); | |
2197 | return bytes; | |
2198 | } | |
2199 | ||
2200 | /** | |
2201 | * port0_lun_table_show() - presents the current LUN table of port 0 | |
2202 | * @dev: Generic device associated with the host owning the port. | |
2203 | * @attr: Device attribute representing the port. | |
2204 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2205 | * | |
2206 | * Return: The size of the ASCII string returned in @buf. | |
2207 | */ | |
2208 | static ssize_t port0_lun_table_show(struct device *dev, | |
2209 | struct device_attribute *attr, | |
2210 | char *buf) | |
2211 | { | |
2212 | struct Scsi_Host *shost = class_to_shost(dev); | |
2213 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
2214 | struct afu *afu = cfg->afu; | |
2215 | ||
2216 | return cxlflash_show_port_lun_table(0, afu, buf); | |
2217 | } | |
2218 | ||
2219 | /** | |
2220 | * port1_lun_table_show() - presents the current LUN table of port 1 | |
2221 | * @dev: Generic device associated with the host owning the port. | |
2222 | * @attr: Device attribute representing the port. | |
2223 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2224 | * | |
2225 | * Return: The size of the ASCII string returned in @buf. | |
2226 | */ | |
2227 | static ssize_t port1_lun_table_show(struct device *dev, | |
2228 | struct device_attribute *attr, | |
2229 | char *buf) | |
2230 | { | |
2231 | struct Scsi_Host *shost = class_to_shost(dev); | |
2232 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
2233 | struct afu *afu = cfg->afu; | |
2234 | ||
2235 | return cxlflash_show_port_lun_table(1, afu, buf); | |
2236 | } | |
2237 | ||
2238 | /** | |
2239 | * mode_show() - presents the current mode of the device | |
15305514 MO |
2240 | * @dev: Generic device associated with the device. |
2241 | * @attr: Device attribute representing the device mode. | |
2242 | * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII. | |
2243 | * | |
2244 | * Return: The size of the ASCII string returned in @buf. | |
2245 | */ | |
e0f01a21 MO |
2246 | static ssize_t mode_show(struct device *dev, |
2247 | struct device_attribute *attr, char *buf) | |
15305514 MO |
2248 | { |
2249 | struct scsi_device *sdev = to_scsi_device(dev); | |
2250 | ||
e0f01a21 MO |
2251 | return scnprintf(buf, PAGE_SIZE, "%s\n", |
2252 | sdev->hostdata ? "superpipe" : "legacy"); | |
15305514 MO |
2253 | } |
2254 | ||
2255 | /* | |
2256 | * Host attributes | |
2257 | */ | |
e0f01a21 MO |
2258 | static DEVICE_ATTR_RO(port0); |
2259 | static DEVICE_ATTR_RO(port1); | |
2260 | static DEVICE_ATTR_RW(lun_mode); | |
2261 | static DEVICE_ATTR_RO(ioctl_version); | |
2262 | static DEVICE_ATTR_RO(port0_lun_table); | |
2263 | static DEVICE_ATTR_RO(port1_lun_table); | |
15305514 MO |
2264 | |
2265 | static struct device_attribute *cxlflash_host_attrs[] = { | |
2266 | &dev_attr_port0, | |
2267 | &dev_attr_port1, | |
2268 | &dev_attr_lun_mode, | |
2269 | &dev_attr_ioctl_version, | |
e0f01a21 MO |
2270 | &dev_attr_port0_lun_table, |
2271 | &dev_attr_port1_lun_table, | |
15305514 MO |
2272 | NULL |
2273 | }; | |
2274 | ||
2275 | /* | |
2276 | * Device attributes | |
2277 | */ | |
e0f01a21 | 2278 | static DEVICE_ATTR_RO(mode); |
15305514 MO |
2279 | |
2280 | static struct device_attribute *cxlflash_dev_attrs[] = { | |
2281 | &dev_attr_mode, | |
2282 | NULL | |
2283 | }; | |
2284 | ||
2285 | /* | |
2286 | * Host template | |
2287 | */ | |
2288 | static struct scsi_host_template driver_template = { | |
2289 | .module = THIS_MODULE, | |
2290 | .name = CXLFLASH_ADAPTER_NAME, | |
2291 | .info = cxlflash_driver_info, | |
2292 | .ioctl = cxlflash_ioctl, | |
2293 | .proc_name = CXLFLASH_NAME, | |
2294 | .queuecommand = cxlflash_queuecommand, | |
2295 | .eh_device_reset_handler = cxlflash_eh_device_reset_handler, | |
2296 | .eh_host_reset_handler = cxlflash_eh_host_reset_handler, | |
2297 | .change_queue_depth = cxlflash_change_queue_depth, | |
2298 | .cmd_per_lun = 16, | |
2299 | .can_queue = CXLFLASH_MAX_CMDS, | |
2300 | .this_id = -1, | |
f15fbf8d | 2301 | .sg_tablesize = SG_NONE, /* No scatter gather support */ |
15305514 MO |
2302 | .max_sectors = CXLFLASH_MAX_SECTORS, |
2303 | .use_clustering = ENABLE_CLUSTERING, | |
2304 | .shost_attrs = cxlflash_host_attrs, | |
2305 | .sdev_attrs = cxlflash_dev_attrs, | |
2306 | }; | |
2307 | ||
2308 | /* | |
2309 | * Device dependent values | |
2310 | */ | |
2311 | static struct dev_dependent_vals dev_corsa_vals = { CXLFLASH_MAX_SECTORS }; | |
a2746fb1 | 2312 | static struct dev_dependent_vals dev_flash_gt_vals = { CXLFLASH_MAX_SECTORS }; |
15305514 MO |
2313 | |
2314 | /* | |
2315 | * PCI device binding table | |
2316 | */ | |
2317 | static struct pci_device_id cxlflash_pci_table[] = { | |
2318 | {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CORSA, | |
2319 | PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_corsa_vals}, | |
a2746fb1 MK |
2320 | {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_FLASH_GT, |
2321 | PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_flash_gt_vals}, | |
15305514 MO |
2322 | {} |
2323 | }; | |
2324 | ||
2325 | MODULE_DEVICE_TABLE(pci, cxlflash_pci_table); | |
2326 | ||
c21e0bbf MO |
2327 | /** |
2328 | * cxlflash_worker_thread() - work thread handler for the AFU | |
2329 | * @work: Work structure contained within cxlflash associated with host. | |
2330 | * | |
2331 | * Handles the following events: | |
2332 | * - Link reset which cannot be performed on interrupt context due to | |
2333 | * blocking up to a few seconds | |
2334 | * - Read AFU command room | |
ef51074a | 2335 | * - Rescan the host |
c21e0bbf MO |
2336 | */ |
2337 | static void cxlflash_worker_thread(struct work_struct *work) | |
2338 | { | |
5cdac81a MO |
2339 | struct cxlflash_cfg *cfg = container_of(work, struct cxlflash_cfg, |
2340 | work_q); | |
c21e0bbf | 2341 | struct afu *afu = cfg->afu; |
4392ba49 | 2342 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
2343 | int port; |
2344 | ulong lock_flags; | |
2345 | ||
5cdac81a MO |
2346 | /* Avoid MMIO if the device has failed */ |
2347 | ||
2348 | if (cfg->state != STATE_NORMAL) | |
2349 | return; | |
2350 | ||
c21e0bbf MO |
2351 | spin_lock_irqsave(cfg->host->host_lock, lock_flags); |
2352 | ||
2353 | if (cfg->lr_state == LINK_RESET_REQUIRED) { | |
2354 | port = cfg->lr_port; | |
2355 | if (port < 0) | |
4392ba49 MO |
2356 | dev_err(dev, "%s: invalid port index %d\n", |
2357 | __func__, port); | |
c21e0bbf MO |
2358 | else { |
2359 | spin_unlock_irqrestore(cfg->host->host_lock, | |
2360 | lock_flags); | |
2361 | ||
2362 | /* The reset can block... */ | |
2363 | afu_link_reset(afu, port, | |
f15fbf8d | 2364 | &afu->afu_map->global.fc_regs[port][0]); |
c21e0bbf MO |
2365 | spin_lock_irqsave(cfg->host->host_lock, lock_flags); |
2366 | } | |
2367 | ||
2368 | cfg->lr_state = LINK_RESET_COMPLETE; | |
2369 | } | |
2370 | ||
2371 | if (afu->read_room) { | |
2372 | atomic64_set(&afu->room, readq_be(&afu->host_map->cmd_room)); | |
2373 | afu->read_room = false; | |
2374 | } | |
2375 | ||
2376 | spin_unlock_irqrestore(cfg->host->host_lock, lock_flags); | |
ef51074a MO |
2377 | |
2378 | if (atomic_dec_if_positive(&cfg->scan_host_needed) >= 0) | |
2379 | scsi_scan_host(cfg->host); | |
b45cdbaf | 2380 | kref_put(&afu->mapcount, afu_unmap); |
c21e0bbf MO |
2381 | } |
2382 | ||
2383 | /** | |
2384 | * cxlflash_probe() - PCI entry point to add host | |
2385 | * @pdev: PCI device associated with the host. | |
2386 | * @dev_id: PCI device id associated with device. | |
2387 | * | |
1284fb0c | 2388 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
2389 | */ |
2390 | static int cxlflash_probe(struct pci_dev *pdev, | |
2391 | const struct pci_device_id *dev_id) | |
2392 | { | |
2393 | struct Scsi_Host *host; | |
2394 | struct cxlflash_cfg *cfg = NULL; | |
2395 | struct device *phys_dev; | |
2396 | struct dev_dependent_vals *ddv; | |
2397 | int rc = 0; | |
2398 | ||
2399 | dev_dbg(&pdev->dev, "%s: Found CXLFLASH with IRQ: %d\n", | |
2400 | __func__, pdev->irq); | |
2401 | ||
2402 | ddv = (struct dev_dependent_vals *)dev_id->driver_data; | |
2403 | driver_template.max_sectors = ddv->max_sectors; | |
2404 | ||
2405 | host = scsi_host_alloc(&driver_template, sizeof(struct cxlflash_cfg)); | |
2406 | if (!host) { | |
2407 | dev_err(&pdev->dev, "%s: call to scsi_host_alloc failed!\n", | |
2408 | __func__); | |
2409 | rc = -ENOMEM; | |
2410 | goto out; | |
2411 | } | |
2412 | ||
2413 | host->max_id = CXLFLASH_MAX_NUM_TARGETS_PER_BUS; | |
2414 | host->max_lun = CXLFLASH_MAX_NUM_LUNS_PER_TARGET; | |
2415 | host->max_channel = NUM_FC_PORTS - 1; | |
2416 | host->unique_id = host->host_no; | |
2417 | host->max_cmd_len = CXLFLASH_MAX_CDB_LEN; | |
2418 | ||
2419 | cfg = (struct cxlflash_cfg *)host->hostdata; | |
2420 | cfg->host = host; | |
2421 | rc = alloc_mem(cfg); | |
2422 | if (rc) { | |
fa3f2c6e | 2423 | dev_err(&pdev->dev, "%s: call to alloc_mem failed!\n", |
c21e0bbf MO |
2424 | __func__); |
2425 | rc = -ENOMEM; | |
8b5b1e87 | 2426 | scsi_host_put(cfg->host); |
c21e0bbf MO |
2427 | goto out; |
2428 | } | |
2429 | ||
2430 | cfg->init_state = INIT_STATE_NONE; | |
2431 | cfg->dev = pdev; | |
17ead26f | 2432 | cfg->cxl_fops = cxlflash_cxl_fops; |
2cb79266 MO |
2433 | |
2434 | /* | |
2435 | * The promoted LUNs move to the top of the LUN table. The rest stay | |
2436 | * on the bottom half. The bottom half grows from the end | |
2437 | * (index = 255), whereas the top half grows from the beginning | |
2438 | * (index = 0). | |
2439 | */ | |
2440 | cfg->promote_lun_index = 0; | |
2441 | cfg->last_lun_index[0] = CXLFLASH_NUM_VLUNS/2 - 1; | |
2442 | cfg->last_lun_index[1] = CXLFLASH_NUM_VLUNS/2 - 1; | |
2443 | ||
c21e0bbf | 2444 | cfg->dev_id = (struct pci_device_id *)dev_id; |
c21e0bbf MO |
2445 | |
2446 | init_waitqueue_head(&cfg->tmf_waitq); | |
439e85c1 | 2447 | init_waitqueue_head(&cfg->reset_waitq); |
c21e0bbf MO |
2448 | |
2449 | INIT_WORK(&cfg->work_q, cxlflash_worker_thread); | |
2450 | cfg->lr_state = LINK_RESET_INVALID; | |
2451 | cfg->lr_port = -1; | |
0d73122c | 2452 | spin_lock_init(&cfg->tmf_slock); |
65be2c79 MO |
2453 | mutex_init(&cfg->ctx_tbl_list_mutex); |
2454 | mutex_init(&cfg->ctx_recovery_mutex); | |
0a27ae51 | 2455 | init_rwsem(&cfg->ioctl_rwsem); |
65be2c79 MO |
2456 | INIT_LIST_HEAD(&cfg->ctx_err_recovery); |
2457 | INIT_LIST_HEAD(&cfg->lluns); | |
c21e0bbf MO |
2458 | |
2459 | pci_set_drvdata(pdev, cfg); | |
2460 | ||
f15fbf8d MO |
2461 | /* |
2462 | * Use the special service provided to look up the physical | |
c21e0bbf MO |
2463 | * PCI device, since we are called on the probe of the virtual |
2464 | * PCI host bus (vphb) | |
2465 | */ | |
2466 | phys_dev = cxl_get_phys_dev(pdev); | |
2467 | if (!dev_is_pci(phys_dev)) { | |
4392ba49 | 2468 | dev_err(&pdev->dev, "%s: not a pci dev\n", __func__); |
c21e0bbf MO |
2469 | rc = -ENODEV; |
2470 | goto out_remove; | |
2471 | } | |
2472 | cfg->parent_dev = to_pci_dev(phys_dev); | |
2473 | ||
2474 | cfg->cxl_afu = cxl_pci_to_afu(pdev); | |
2475 | ||
2476 | rc = init_pci(cfg); | |
2477 | if (rc) { | |
2478 | dev_err(&pdev->dev, "%s: call to init_pci " | |
2479 | "failed rc=%d!\n", __func__, rc); | |
2480 | goto out_remove; | |
2481 | } | |
2482 | cfg->init_state = INIT_STATE_PCI; | |
2483 | ||
2484 | rc = init_afu(cfg); | |
2485 | if (rc) { | |
2486 | dev_err(&pdev->dev, "%s: call to init_afu " | |
2487 | "failed rc=%d!\n", __func__, rc); | |
2488 | goto out_remove; | |
2489 | } | |
2490 | cfg->init_state = INIT_STATE_AFU; | |
2491 | ||
c21e0bbf MO |
2492 | rc = init_scsi(cfg); |
2493 | if (rc) { | |
2494 | dev_err(&pdev->dev, "%s: call to init_scsi " | |
2495 | "failed rc=%d!\n", __func__, rc); | |
2496 | goto out_remove; | |
2497 | } | |
2498 | cfg->init_state = INIT_STATE_SCSI; | |
2499 | ||
2500 | out: | |
2501 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
2502 | return rc; | |
2503 | ||
2504 | out_remove: | |
2505 | cxlflash_remove(pdev); | |
2506 | goto out; | |
2507 | } | |
2508 | ||
0a27ae51 MO |
2509 | /** |
2510 | * drain_ioctls() - wait until all currently executing ioctls have completed | |
2511 | * @cfg: Internal structure associated with the host. | |
2512 | * | |
2513 | * Obtain write access to read/write semaphore that wraps ioctl | |
2514 | * handling to 'drain' ioctls currently executing. | |
2515 | */ | |
2516 | static void drain_ioctls(struct cxlflash_cfg *cfg) | |
2517 | { | |
2518 | down_write(&cfg->ioctl_rwsem); | |
2519 | up_write(&cfg->ioctl_rwsem); | |
2520 | } | |
2521 | ||
5cdac81a MO |
2522 | /** |
2523 | * cxlflash_pci_error_detected() - called when a PCI error is detected | |
2524 | * @pdev: PCI device struct. | |
2525 | * @state: PCI channel state. | |
2526 | * | |
2527 | * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT | |
2528 | */ | |
2529 | static pci_ers_result_t cxlflash_pci_error_detected(struct pci_dev *pdev, | |
2530 | pci_channel_state_t state) | |
2531 | { | |
65be2c79 | 2532 | int rc = 0; |
5cdac81a MO |
2533 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); |
2534 | struct device *dev = &cfg->dev->dev; | |
2535 | ||
2536 | dev_dbg(dev, "%s: pdev=%p state=%u\n", __func__, pdev, state); | |
2537 | ||
2538 | switch (state) { | |
2539 | case pci_channel_io_frozen: | |
439e85c1 | 2540 | cfg->state = STATE_RESET; |
5cdac81a | 2541 | scsi_block_requests(cfg->host); |
0a27ae51 | 2542 | drain_ioctls(cfg); |
65be2c79 MO |
2543 | rc = cxlflash_mark_contexts_error(cfg); |
2544 | if (unlikely(rc)) | |
2545 | dev_err(dev, "%s: Failed to mark user contexts!(%d)\n", | |
2546 | __func__, rc); | |
5cdac81a MO |
2547 | term_mc(cfg, UNDO_START); |
2548 | stop_afu(cfg); | |
5cdac81a MO |
2549 | return PCI_ERS_RESULT_NEED_RESET; |
2550 | case pci_channel_io_perm_failure: | |
2551 | cfg->state = STATE_FAILTERM; | |
439e85c1 | 2552 | wake_up_all(&cfg->reset_waitq); |
5cdac81a MO |
2553 | scsi_unblock_requests(cfg->host); |
2554 | return PCI_ERS_RESULT_DISCONNECT; | |
2555 | default: | |
2556 | break; | |
2557 | } | |
2558 | return PCI_ERS_RESULT_NEED_RESET; | |
2559 | } | |
2560 | ||
2561 | /** | |
2562 | * cxlflash_pci_slot_reset() - called when PCI slot has been reset | |
2563 | * @pdev: PCI device struct. | |
2564 | * | |
2565 | * This routine is called by the pci error recovery code after the PCI | |
2566 | * slot has been reset, just before we should resume normal operations. | |
2567 | * | |
2568 | * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT | |
2569 | */ | |
2570 | static pci_ers_result_t cxlflash_pci_slot_reset(struct pci_dev *pdev) | |
2571 | { | |
2572 | int rc = 0; | |
2573 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); | |
2574 | struct device *dev = &cfg->dev->dev; | |
2575 | ||
2576 | dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev); | |
2577 | ||
2578 | rc = init_afu(cfg); | |
2579 | if (unlikely(rc)) { | |
2580 | dev_err(dev, "%s: EEH recovery failed! (%d)\n", __func__, rc); | |
2581 | return PCI_ERS_RESULT_DISCONNECT; | |
2582 | } | |
2583 | ||
2584 | return PCI_ERS_RESULT_RECOVERED; | |
2585 | } | |
2586 | ||
2587 | /** | |
2588 | * cxlflash_pci_resume() - called when normal operation can resume | |
2589 | * @pdev: PCI device struct | |
2590 | */ | |
2591 | static void cxlflash_pci_resume(struct pci_dev *pdev) | |
2592 | { | |
2593 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); | |
2594 | struct device *dev = &cfg->dev->dev; | |
2595 | ||
2596 | dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev); | |
2597 | ||
2598 | cfg->state = STATE_NORMAL; | |
439e85c1 | 2599 | wake_up_all(&cfg->reset_waitq); |
5cdac81a MO |
2600 | scsi_unblock_requests(cfg->host); |
2601 | } | |
2602 | ||
2603 | static const struct pci_error_handlers cxlflash_err_handler = { | |
2604 | .error_detected = cxlflash_pci_error_detected, | |
2605 | .slot_reset = cxlflash_pci_slot_reset, | |
2606 | .resume = cxlflash_pci_resume, | |
2607 | }; | |
2608 | ||
c21e0bbf MO |
2609 | /* |
2610 | * PCI device structure | |
2611 | */ | |
2612 | static struct pci_driver cxlflash_driver = { | |
2613 | .name = CXLFLASH_NAME, | |
2614 | .id_table = cxlflash_pci_table, | |
2615 | .probe = cxlflash_probe, | |
2616 | .remove = cxlflash_remove, | |
5cdac81a | 2617 | .err_handler = &cxlflash_err_handler, |
c21e0bbf MO |
2618 | }; |
2619 | ||
2620 | /** | |
2621 | * init_cxlflash() - module entry point | |
2622 | * | |
1284fb0c | 2623 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
2624 | */ |
2625 | static int __init init_cxlflash(void) | |
2626 | { | |
85599218 | 2627 | pr_info("%s: %s\n", __func__, CXLFLASH_ADAPTER_NAME); |
c21e0bbf | 2628 | |
65be2c79 MO |
2629 | cxlflash_list_init(); |
2630 | ||
c21e0bbf MO |
2631 | return pci_register_driver(&cxlflash_driver); |
2632 | } | |
2633 | ||
2634 | /** | |
2635 | * exit_cxlflash() - module exit point | |
2636 | */ | |
2637 | static void __exit exit_cxlflash(void) | |
2638 | { | |
65be2c79 MO |
2639 | cxlflash_term_global_luns(); |
2640 | cxlflash_free_errpage(); | |
2641 | ||
c21e0bbf MO |
2642 | pci_unregister_driver(&cxlflash_driver); |
2643 | } | |
2644 | ||
2645 | module_init(init_cxlflash); | |
2646 | module_exit(exit_cxlflash); |