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Commit | Line | Data |
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c21e0bbf MO |
1 | /* |
2 | * CXL Flash Device Driver | |
3 | * | |
4 | * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation | |
5 | * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation | |
6 | * | |
7 | * Copyright (C) 2015 IBM Corporation | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | #include <linux/delay.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/pci.h> | |
19 | ||
20 | #include <asm/unaligned.h> | |
21 | ||
22 | #include <misc/cxl.h> | |
23 | ||
24 | #include <scsi/scsi_cmnd.h> | |
25 | #include <scsi/scsi_host.h> | |
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; | |
371 | schedule_work(&cfg->work_q); | |
372 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
373 | goto out; | |
374 | } | |
375 | ||
376 | /** | |
377 | * wait_resp() - polls for a response or timeout to a sent AFU command | |
378 | * @afu: AFU associated with the host. | |
379 | * @cmd: AFU command that was sent. | |
380 | */ | |
381 | static void wait_resp(struct afu *afu, struct afu_cmd *cmd) | |
382 | { | |
383 | ulong timeout = msecs_to_jiffies(cmd->rcb.timeout * 2 * 1000); | |
384 | ||
385 | timeout = wait_for_completion_timeout(&cmd->cevent, timeout); | |
386 | if (!timeout) | |
387 | context_reset(cmd); | |
388 | ||
389 | if (unlikely(cmd->sa.ioasc != 0)) | |
390 | pr_err("%s: CMD 0x%X failed, IOASC: flags 0x%X, afu_rc 0x%X, " | |
391 | "scsi_rc 0x%X, fc_rc 0x%X\n", __func__, cmd->rcb.cdb[0], | |
392 | cmd->sa.rc.flags, cmd->sa.rc.afu_rc, cmd->sa.rc.scsi_rc, | |
393 | cmd->sa.rc.fc_rc); | |
394 | } | |
395 | ||
c21e0bbf MO |
396 | /** |
397 | * send_tmf() - sends a Task Management Function (TMF) | |
398 | * @afu: AFU to checkout from. | |
399 | * @scp: SCSI command from stack. | |
400 | * @tmfcmd: TMF command to send. | |
401 | * | |
402 | * Return: | |
1284fb0c | 403 | * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure |
c21e0bbf MO |
404 | */ |
405 | static int send_tmf(struct afu *afu, struct scsi_cmnd *scp, u64 tmfcmd) | |
406 | { | |
407 | struct afu_cmd *cmd; | |
408 | ||
409 | u32 port_sel = scp->device->channel + 1; | |
410 | short lflag = 0; | |
411 | struct Scsi_Host *host = scp->device->host; | |
412 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; | |
4392ba49 | 413 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
414 | ulong lock_flags; |
415 | int rc = 0; | |
018d1dc9 | 416 | ulong to; |
c21e0bbf | 417 | |
15305514 | 418 | cmd = cmd_checkout(afu); |
c21e0bbf | 419 | if (unlikely(!cmd)) { |
4392ba49 | 420 | dev_err(dev, "%s: could not get a free command\n", __func__); |
c21e0bbf MO |
421 | rc = SCSI_MLQUEUE_HOST_BUSY; |
422 | goto out; | |
423 | } | |
424 | ||
018d1dc9 MO |
425 | /* When Task Management Function is active do not send another */ |
426 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); | |
c21e0bbf | 427 | if (cfg->tmf_active) |
018d1dc9 MO |
428 | wait_event_interruptible_lock_irq(cfg->tmf_waitq, |
429 | !cfg->tmf_active, | |
430 | cfg->tmf_slock); | |
c21e0bbf MO |
431 | cfg->tmf_active = true; |
432 | cmd->cmd_tmf = true; | |
018d1dc9 | 433 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
434 | |
435 | cmd->rcb.ctx_id = afu->ctx_hndl; | |
436 | cmd->rcb.port_sel = port_sel; | |
437 | cmd->rcb.lun_id = lun_to_lunid(scp->device->lun); | |
438 | ||
439 | lflag = SISL_REQ_FLAGS_TMF_CMD; | |
440 | ||
441 | cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID | | |
442 | SISL_REQ_FLAGS_SUP_UNDERRUN | lflag); | |
443 | ||
444 | /* Stash the scp in the reserved field, for reuse during interrupt */ | |
445 | cmd->rcb.scp = scp; | |
446 | ||
447 | /* Copy the CDB from the cmd passed in */ | |
448 | memcpy(cmd->rcb.cdb, &tmfcmd, sizeof(tmfcmd)); | |
449 | ||
450 | /* Send the command */ | |
15305514 | 451 | rc = send_cmd(afu, cmd); |
c21e0bbf | 452 | if (unlikely(rc)) { |
15305514 | 453 | cmd_checkin(cmd); |
018d1dc9 | 454 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 455 | cfg->tmf_active = false; |
018d1dc9 | 456 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
457 | goto out; |
458 | } | |
459 | ||
018d1dc9 MO |
460 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
461 | to = msecs_to_jiffies(5000); | |
462 | to = wait_event_interruptible_lock_irq_timeout(cfg->tmf_waitq, | |
463 | !cfg->tmf_active, | |
464 | cfg->tmf_slock, | |
465 | to); | |
466 | if (!to) { | |
467 | cfg->tmf_active = false; | |
468 | dev_err(dev, "%s: TMF timed out!\n", __func__); | |
469 | rc = -1; | |
470 | } | |
471 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); | |
c21e0bbf MO |
472 | out: |
473 | return rc; | |
474 | } | |
475 | ||
476 | /** | |
477 | * cxlflash_driver_info() - information handler for this host driver | |
478 | * @host: SCSI host associated with device. | |
479 | * | |
480 | * Return: A string describing the device. | |
481 | */ | |
482 | static const char *cxlflash_driver_info(struct Scsi_Host *host) | |
483 | { | |
484 | return CXLFLASH_ADAPTER_NAME; | |
485 | } | |
486 | ||
487 | /** | |
488 | * cxlflash_queuecommand() - sends a mid-layer request | |
489 | * @host: SCSI host associated with device. | |
490 | * @scp: SCSI command to send. | |
491 | * | |
1284fb0c | 492 | * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure |
c21e0bbf MO |
493 | */ |
494 | static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp) | |
495 | { | |
496 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; | |
497 | struct afu *afu = cfg->afu; | |
4392ba49 | 498 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
499 | struct afu_cmd *cmd; |
500 | u32 port_sel = scp->device->channel + 1; | |
501 | int nseg, i, ncount; | |
502 | struct scatterlist *sg; | |
503 | ulong lock_flags; | |
504 | short lflag = 0; | |
505 | int rc = 0; | |
506 | ||
4392ba49 MO |
507 | dev_dbg_ratelimited(dev, "%s: (scp=%p) %d/%d/%d/%llu " |
508 | "cdb=(%08X-%08X-%08X-%08X)\n", | |
509 | __func__, scp, host->host_no, scp->device->channel, | |
510 | scp->device->id, scp->device->lun, | |
511 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
512 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
513 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
514 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
c21e0bbf | 515 | |
018d1dc9 MO |
516 | /* |
517 | * If a Task Management Function is active, wait for it to complete | |
c21e0bbf MO |
518 | * before continuing with regular commands. |
519 | */ | |
018d1dc9 | 520 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 521 | if (cfg->tmf_active) { |
018d1dc9 | 522 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
523 | rc = SCSI_MLQUEUE_HOST_BUSY; |
524 | goto out; | |
525 | } | |
018d1dc9 | 526 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 527 | |
5cdac81a | 528 | switch (cfg->state) { |
439e85c1 | 529 | case STATE_RESET: |
4392ba49 | 530 | dev_dbg_ratelimited(dev, "%s: device is in reset!\n", __func__); |
5cdac81a MO |
531 | rc = SCSI_MLQUEUE_HOST_BUSY; |
532 | goto out; | |
533 | case STATE_FAILTERM: | |
4392ba49 | 534 | dev_dbg_ratelimited(dev, "%s: device has failed!\n", __func__); |
5cdac81a MO |
535 | scp->result = (DID_NO_CONNECT << 16); |
536 | scp->scsi_done(scp); | |
537 | rc = 0; | |
538 | goto out; | |
539 | default: | |
540 | break; | |
541 | } | |
542 | ||
15305514 | 543 | cmd = cmd_checkout(afu); |
c21e0bbf | 544 | if (unlikely(!cmd)) { |
4392ba49 | 545 | dev_err(dev, "%s: could not get a free command\n", __func__); |
c21e0bbf MO |
546 | rc = SCSI_MLQUEUE_HOST_BUSY; |
547 | goto out; | |
548 | } | |
549 | ||
550 | cmd->rcb.ctx_id = afu->ctx_hndl; | |
551 | cmd->rcb.port_sel = port_sel; | |
552 | cmd->rcb.lun_id = lun_to_lunid(scp->device->lun); | |
553 | ||
554 | if (scp->sc_data_direction == DMA_TO_DEVICE) | |
555 | lflag = SISL_REQ_FLAGS_HOST_WRITE; | |
556 | else | |
557 | lflag = SISL_REQ_FLAGS_HOST_READ; | |
558 | ||
559 | cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID | | |
560 | SISL_REQ_FLAGS_SUP_UNDERRUN | lflag); | |
561 | ||
562 | /* Stash the scp in the reserved field, for reuse during interrupt */ | |
563 | cmd->rcb.scp = scp; | |
564 | ||
565 | nseg = scsi_dma_map(scp); | |
566 | if (unlikely(nseg < 0)) { | |
4392ba49 | 567 | dev_err(dev, "%s: Fail DMA map! nseg=%d\n", |
c21e0bbf MO |
568 | __func__, nseg); |
569 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
570 | goto out; | |
571 | } | |
572 | ||
573 | ncount = scsi_sg_count(scp); | |
574 | scsi_for_each_sg(scp, sg, ncount, i) { | |
575 | cmd->rcb.data_len = sg_dma_len(sg); | |
576 | cmd->rcb.data_ea = sg_dma_address(sg); | |
577 | } | |
578 | ||
579 | /* Copy the CDB from the scsi_cmnd passed in */ | |
580 | memcpy(cmd->rcb.cdb, scp->cmnd, sizeof(cmd->rcb.cdb)); | |
581 | ||
582 | /* Send the command */ | |
15305514 | 583 | rc = send_cmd(afu, cmd); |
c21e0bbf | 584 | if (unlikely(rc)) { |
15305514 | 585 | cmd_checkin(cmd); |
c21e0bbf MO |
586 | scsi_dma_unmap(scp); |
587 | } | |
588 | ||
589 | out: | |
4392ba49 | 590 | pr_devel("%s: returning rc=%d\n", __func__, rc); |
c21e0bbf MO |
591 | return rc; |
592 | } | |
593 | ||
594 | /** | |
15305514 | 595 | * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe |
1284fb0c | 596 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 597 | */ |
15305514 | 598 | static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg *cfg) |
c21e0bbf | 599 | { |
15305514 | 600 | struct pci_dev *pdev = cfg->dev; |
c21e0bbf | 601 | |
15305514 MO |
602 | if (pci_channel_offline(pdev)) |
603 | wait_event_timeout(cfg->reset_waitq, | |
604 | !pci_channel_offline(pdev), | |
605 | CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT); | |
c21e0bbf MO |
606 | } |
607 | ||
608 | /** | |
15305514 | 609 | * free_mem() - free memory associated with the AFU |
1284fb0c | 610 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 611 | */ |
15305514 | 612 | static void free_mem(struct cxlflash_cfg *cfg) |
c21e0bbf | 613 | { |
15305514 MO |
614 | int i; |
615 | char *buf = NULL; | |
616 | struct afu *afu = cfg->afu; | |
c21e0bbf | 617 | |
15305514 MO |
618 | if (cfg->afu) { |
619 | for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { | |
620 | buf = afu->cmd[i].buf; | |
621 | if (!((u64)buf & (PAGE_SIZE - 1))) | |
622 | free_page((ulong)buf); | |
623 | } | |
c21e0bbf | 624 | |
15305514 MO |
625 | free_pages((ulong)afu, get_order(sizeof(struct afu))); |
626 | cfg->afu = NULL; | |
5cdac81a | 627 | } |
c21e0bbf MO |
628 | } |
629 | ||
630 | /** | |
15305514 | 631 | * stop_afu() - stops the AFU command timers and unmaps the MMIO space |
1284fb0c | 632 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 633 | * |
15305514 | 634 | * Safe to call with AFU in a partially allocated/initialized state. |
c21e0bbf | 635 | */ |
15305514 | 636 | static void stop_afu(struct cxlflash_cfg *cfg) |
c21e0bbf | 637 | { |
15305514 MO |
638 | int i; |
639 | struct afu *afu = cfg->afu; | |
c21e0bbf | 640 | |
15305514 MO |
641 | if (likely(afu)) { |
642 | for (i = 0; i < CXLFLASH_NUM_CMDS; i++) | |
643 | complete(&afu->cmd[i].cevent); | |
c21e0bbf MO |
644 | |
645 | if (likely(afu->afu_map)) { | |
1786f4a0 | 646 | cxl_psa_unmap((void __iomem *)afu->afu_map); |
c21e0bbf MO |
647 | afu->afu_map = NULL; |
648 | } | |
649 | } | |
650 | } | |
651 | ||
652 | /** | |
653 | * term_mc() - terminates the master context | |
1284fb0c | 654 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
655 | * @level: Depth of allocation, where to begin waterfall tear down. |
656 | * | |
657 | * Safe to call with AFU/MC in partially allocated/initialized state. | |
658 | */ | |
659 | static void term_mc(struct cxlflash_cfg *cfg, enum undo_level level) | |
660 | { | |
661 | int rc = 0; | |
662 | struct afu *afu = cfg->afu; | |
4392ba49 | 663 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
664 | |
665 | if (!afu || !cfg->mcctx) { | |
4392ba49 | 666 | dev_err(dev, "%s: returning from term_mc with NULL afu or MC\n", |
c21e0bbf MO |
667 | __func__); |
668 | return; | |
669 | } | |
670 | ||
671 | switch (level) { | |
672 | case UNDO_START: | |
673 | rc = cxl_stop_context(cfg->mcctx); | |
674 | BUG_ON(rc); | |
675 | case UNMAP_THREE: | |
676 | cxl_unmap_afu_irq(cfg->mcctx, 3, afu); | |
677 | case UNMAP_TWO: | |
678 | cxl_unmap_afu_irq(cfg->mcctx, 2, afu); | |
679 | case UNMAP_ONE: | |
680 | cxl_unmap_afu_irq(cfg->mcctx, 1, afu); | |
681 | case FREE_IRQ: | |
682 | cxl_free_afu_irqs(cfg->mcctx); | |
683 | case RELEASE_CONTEXT: | |
684 | cfg->mcctx = NULL; | |
685 | } | |
686 | } | |
687 | ||
688 | /** | |
689 | * term_afu() - terminates the AFU | |
1284fb0c | 690 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
691 | * |
692 | * Safe to call with AFU/MC in partially allocated/initialized state. | |
693 | */ | |
694 | static void term_afu(struct cxlflash_cfg *cfg) | |
695 | { | |
696 | term_mc(cfg, UNDO_START); | |
697 | ||
698 | if (cfg->afu) | |
699 | stop_afu(cfg); | |
700 | ||
701 | pr_debug("%s: returning\n", __func__); | |
702 | } | |
703 | ||
704 | /** | |
705 | * cxlflash_remove() - PCI entry point to tear down host | |
706 | * @pdev: PCI device associated with the host. | |
707 | * | |
708 | * Safe to use as a cleanup in partially allocated/initialized state. | |
709 | */ | |
710 | static void cxlflash_remove(struct pci_dev *pdev) | |
711 | { | |
712 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); | |
713 | ulong lock_flags; | |
714 | ||
715 | /* If a Task Management Function is active, wait for it to complete | |
716 | * before continuing with remove. | |
717 | */ | |
018d1dc9 | 718 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 719 | if (cfg->tmf_active) |
018d1dc9 MO |
720 | wait_event_interruptible_lock_irq(cfg->tmf_waitq, |
721 | !cfg->tmf_active, | |
722 | cfg->tmf_slock); | |
723 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); | |
c21e0bbf | 724 | |
5cdac81a | 725 | cfg->state = STATE_FAILTERM; |
65be2c79 | 726 | cxlflash_stop_term_user_contexts(cfg); |
5cdac81a | 727 | |
c21e0bbf MO |
728 | switch (cfg->init_state) { |
729 | case INIT_STATE_SCSI: | |
65be2c79 | 730 | cxlflash_term_local_luns(cfg); |
c21e0bbf | 731 | scsi_remove_host(cfg->host); |
f15fbf8d | 732 | /* fall through */ |
c21e0bbf MO |
733 | case INIT_STATE_AFU: |
734 | term_afu(cfg); | |
d804621d | 735 | cancel_work_sync(&cfg->work_q); |
c21e0bbf MO |
736 | case INIT_STATE_PCI: |
737 | pci_release_regions(cfg->dev); | |
738 | pci_disable_device(pdev); | |
739 | case INIT_STATE_NONE: | |
c21e0bbf | 740 | free_mem(cfg); |
8b5b1e87 | 741 | scsi_host_put(cfg->host); |
c21e0bbf MO |
742 | break; |
743 | } | |
744 | ||
745 | pr_debug("%s: returning\n", __func__); | |
746 | } | |
747 | ||
748 | /** | |
749 | * alloc_mem() - allocates the AFU and its command pool | |
1284fb0c | 750 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
751 | * |
752 | * A partially allocated state remains on failure. | |
753 | * | |
754 | * Return: | |
755 | * 0 on success | |
756 | * -ENOMEM on failure to allocate memory | |
757 | */ | |
758 | static int alloc_mem(struct cxlflash_cfg *cfg) | |
759 | { | |
760 | int rc = 0; | |
761 | int i; | |
762 | char *buf = NULL; | |
4392ba49 | 763 | struct device *dev = &cfg->dev->dev; |
c21e0bbf | 764 | |
f15fbf8d | 765 | /* AFU is ~12k, i.e. only one 64k page or up to four 4k pages */ |
c21e0bbf MO |
766 | cfg->afu = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, |
767 | get_order(sizeof(struct afu))); | |
768 | if (unlikely(!cfg->afu)) { | |
4392ba49 MO |
769 | dev_err(dev, "%s: cannot get %d free pages\n", |
770 | __func__, get_order(sizeof(struct afu))); | |
c21e0bbf MO |
771 | rc = -ENOMEM; |
772 | goto out; | |
773 | } | |
774 | cfg->afu->parent = cfg; | |
775 | cfg->afu->afu_map = NULL; | |
776 | ||
777 | for (i = 0; i < CXLFLASH_NUM_CMDS; buf += CMD_BUFSIZE, i++) { | |
778 | if (!((u64)buf & (PAGE_SIZE - 1))) { | |
779 | buf = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO); | |
780 | if (unlikely(!buf)) { | |
4392ba49 MO |
781 | dev_err(dev, |
782 | "%s: Allocate command buffers fail!\n", | |
c21e0bbf MO |
783 | __func__); |
784 | rc = -ENOMEM; | |
785 | free_mem(cfg); | |
786 | goto out; | |
787 | } | |
788 | } | |
789 | ||
790 | cfg->afu->cmd[i].buf = buf; | |
791 | atomic_set(&cfg->afu->cmd[i].free, 1); | |
792 | cfg->afu->cmd[i].slot = i; | |
793 | } | |
794 | ||
795 | out: | |
796 | return rc; | |
797 | } | |
798 | ||
799 | /** | |
800 | * init_pci() - initializes the host as a PCI device | |
1284fb0c | 801 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 802 | * |
1284fb0c | 803 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
804 | */ |
805 | static int init_pci(struct cxlflash_cfg *cfg) | |
806 | { | |
807 | struct pci_dev *pdev = cfg->dev; | |
808 | int rc = 0; | |
809 | ||
810 | cfg->cxlflash_regs_pci = pci_resource_start(pdev, 0); | |
811 | rc = pci_request_regions(pdev, CXLFLASH_NAME); | |
812 | if (rc < 0) { | |
813 | dev_err(&pdev->dev, | |
814 | "%s: Couldn't register memory range of registers\n", | |
815 | __func__); | |
816 | goto out; | |
817 | } | |
818 | ||
819 | rc = pci_enable_device(pdev); | |
820 | if (rc || pci_channel_offline(pdev)) { | |
821 | if (pci_channel_offline(pdev)) { | |
822 | cxlflash_wait_for_pci_err_recovery(cfg); | |
823 | rc = pci_enable_device(pdev); | |
824 | } | |
825 | ||
826 | if (rc) { | |
827 | dev_err(&pdev->dev, "%s: Cannot enable adapter\n", | |
828 | __func__); | |
829 | cxlflash_wait_for_pci_err_recovery(cfg); | |
830 | goto out_release_regions; | |
831 | } | |
832 | } | |
833 | ||
834 | rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); | |
835 | if (rc < 0) { | |
836 | dev_dbg(&pdev->dev, "%s: Failed to set 64 bit PCI DMA mask\n", | |
837 | __func__); | |
838 | rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); | |
839 | } | |
840 | ||
841 | if (rc < 0) { | |
842 | dev_err(&pdev->dev, "%s: Failed to set PCI DMA mask\n", | |
843 | __func__); | |
844 | goto out_disable; | |
845 | } | |
846 | ||
847 | pci_set_master(pdev); | |
848 | ||
849 | if (pci_channel_offline(pdev)) { | |
850 | cxlflash_wait_for_pci_err_recovery(cfg); | |
851 | if (pci_channel_offline(pdev)) { | |
852 | rc = -EIO; | |
853 | goto out_msi_disable; | |
854 | } | |
855 | } | |
856 | ||
857 | rc = pci_save_state(pdev); | |
858 | ||
859 | if (rc != PCIBIOS_SUCCESSFUL) { | |
860 | dev_err(&pdev->dev, "%s: Failed to save PCI config space\n", | |
861 | __func__); | |
862 | rc = -EIO; | |
863 | goto cleanup_nolog; | |
864 | } | |
865 | ||
866 | out: | |
867 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
868 | return rc; | |
869 | ||
870 | cleanup_nolog: | |
871 | out_msi_disable: | |
872 | cxlflash_wait_for_pci_err_recovery(cfg); | |
873 | out_disable: | |
874 | pci_disable_device(pdev); | |
875 | out_release_regions: | |
876 | pci_release_regions(pdev); | |
877 | goto out; | |
878 | ||
879 | } | |
880 | ||
881 | /** | |
882 | * init_scsi() - adds the host to the SCSI stack and kicks off host scan | |
1284fb0c | 883 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 884 | * |
1284fb0c | 885 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
886 | */ |
887 | static int init_scsi(struct cxlflash_cfg *cfg) | |
888 | { | |
889 | struct pci_dev *pdev = cfg->dev; | |
890 | int rc = 0; | |
891 | ||
892 | rc = scsi_add_host(cfg->host, &pdev->dev); | |
893 | if (rc) { | |
894 | dev_err(&pdev->dev, "%s: scsi_add_host failed (rc=%d)\n", | |
895 | __func__, rc); | |
896 | goto out; | |
897 | } | |
898 | ||
899 | scsi_scan_host(cfg->host); | |
900 | ||
901 | out: | |
902 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
903 | return rc; | |
904 | } | |
905 | ||
906 | /** | |
907 | * set_port_online() - transitions the specified host FC port to online state | |
908 | * @fc_regs: Top of MMIO region defined for specified port. | |
909 | * | |
910 | * The provided MMIO region must be mapped prior to call. Online state means | |
911 | * that the FC link layer has synced, completed the handshaking process, and | |
912 | * is ready for login to start. | |
913 | */ | |
1786f4a0 | 914 | static void set_port_online(__be64 __iomem *fc_regs) |
c21e0bbf MO |
915 | { |
916 | u64 cmdcfg; | |
917 | ||
918 | cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
919 | cmdcfg &= (~FC_MTIP_CMDCONFIG_OFFLINE); /* clear OFF_LINE */ | |
920 | cmdcfg |= (FC_MTIP_CMDCONFIG_ONLINE); /* set ON_LINE */ | |
921 | writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
922 | } | |
923 | ||
924 | /** | |
925 | * set_port_offline() - transitions the specified host FC port to offline state | |
926 | * @fc_regs: Top of MMIO region defined for specified port. | |
927 | * | |
928 | * The provided MMIO region must be mapped prior to call. | |
929 | */ | |
1786f4a0 | 930 | static void set_port_offline(__be64 __iomem *fc_regs) |
c21e0bbf MO |
931 | { |
932 | u64 cmdcfg; | |
933 | ||
934 | cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
935 | cmdcfg &= (~FC_MTIP_CMDCONFIG_ONLINE); /* clear ON_LINE */ | |
936 | cmdcfg |= (FC_MTIP_CMDCONFIG_OFFLINE); /* set OFF_LINE */ | |
937 | writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
938 | } | |
939 | ||
940 | /** | |
941 | * wait_port_online() - waits for the specified host FC port come online | |
942 | * @fc_regs: Top of MMIO region defined for specified port. | |
943 | * @delay_us: Number of microseconds to delay between reading port status. | |
944 | * @nretry: Number of cycles to retry reading port status. | |
945 | * | |
946 | * The provided MMIO region must be mapped prior to call. This will timeout | |
947 | * when the cable is not plugged in. | |
948 | * | |
949 | * Return: | |
950 | * TRUE (1) when the specified port is online | |
951 | * FALSE (0) when the specified port fails to come online after timeout | |
952 | * -EINVAL when @delay_us is less than 1000 | |
953 | */ | |
1786f4a0 | 954 | static int wait_port_online(__be64 __iomem *fc_regs, u32 delay_us, u32 nretry) |
c21e0bbf MO |
955 | { |
956 | u64 status; | |
957 | ||
958 | if (delay_us < 1000) { | |
959 | pr_err("%s: invalid delay specified %d\n", __func__, delay_us); | |
960 | return -EINVAL; | |
961 | } | |
962 | ||
963 | do { | |
964 | msleep(delay_us / 1000); | |
965 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); | |
966 | } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_ONLINE && | |
967 | nretry--); | |
968 | ||
969 | return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_ONLINE); | |
970 | } | |
971 | ||
972 | /** | |
973 | * wait_port_offline() - waits for the specified host FC port go offline | |
974 | * @fc_regs: Top of MMIO region defined for specified port. | |
975 | * @delay_us: Number of microseconds to delay between reading port status. | |
976 | * @nretry: Number of cycles to retry reading port status. | |
977 | * | |
978 | * The provided MMIO region must be mapped prior to call. | |
979 | * | |
980 | * Return: | |
981 | * TRUE (1) when the specified port is offline | |
982 | * FALSE (0) when the specified port fails to go offline after timeout | |
983 | * -EINVAL when @delay_us is less than 1000 | |
984 | */ | |
1786f4a0 | 985 | static int wait_port_offline(__be64 __iomem *fc_regs, u32 delay_us, u32 nretry) |
c21e0bbf MO |
986 | { |
987 | u64 status; | |
988 | ||
989 | if (delay_us < 1000) { | |
990 | pr_err("%s: invalid delay specified %d\n", __func__, delay_us); | |
991 | return -EINVAL; | |
992 | } | |
993 | ||
994 | do { | |
995 | msleep(delay_us / 1000); | |
996 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); | |
997 | } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_OFFLINE && | |
998 | nretry--); | |
999 | ||
1000 | return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_OFFLINE); | |
1001 | } | |
1002 | ||
1003 | /** | |
1004 | * afu_set_wwpn() - configures the WWPN for the specified host FC port | |
1005 | * @afu: AFU associated with the host that owns the specified FC port. | |
1006 | * @port: Port number being configured. | |
1007 | * @fc_regs: Top of MMIO region defined for specified port. | |
1008 | * @wwpn: The world-wide-port-number previously discovered for port. | |
1009 | * | |
1010 | * The provided MMIO region must be mapped prior to call. As part of the | |
1011 | * sequence to configure the WWPN, the port is toggled offline and then back | |
1012 | * online. This toggling action can cause this routine to delay up to a few | |
1013 | * seconds. When configured to use the internal LUN feature of the AFU, a | |
1014 | * failure to come online is overridden. | |
1015 | * | |
1016 | * Return: | |
1017 | * 0 when the WWPN is successfully written and the port comes back online | |
1018 | * -1 when the port fails to go offline or come back up online | |
1019 | */ | |
1786f4a0 MO |
1020 | static int afu_set_wwpn(struct afu *afu, int port, __be64 __iomem *fc_regs, |
1021 | u64 wwpn) | |
c21e0bbf | 1022 | { |
964497b3 | 1023 | int rc = 0; |
c21e0bbf MO |
1024 | |
1025 | set_port_offline(fc_regs); | |
1026 | ||
1027 | if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
1028 | FC_PORT_STATUS_RETRY_CNT)) { | |
1029 | pr_debug("%s: wait on port %d to go offline timed out\n", | |
1030 | __func__, port); | |
964497b3 | 1031 | rc = -1; /* but continue on to leave the port back online */ |
c21e0bbf MO |
1032 | } |
1033 | ||
964497b3 | 1034 | if (rc == 0) |
c21e0bbf MO |
1035 | writeq_be(wwpn, &fc_regs[FC_PNAME / 8]); |
1036 | ||
964497b3 MO |
1037 | /* Always return success after programming WWPN */ |
1038 | rc = 0; | |
1039 | ||
c21e0bbf MO |
1040 | set_port_online(fc_regs); |
1041 | ||
1042 | if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
1043 | FC_PORT_STATUS_RETRY_CNT)) { | |
964497b3 MO |
1044 | pr_err("%s: wait on port %d to go online timed out\n", |
1045 | __func__, port); | |
c21e0bbf MO |
1046 | } |
1047 | ||
964497b3 | 1048 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
c21e0bbf | 1049 | |
964497b3 | 1050 | return rc; |
c21e0bbf MO |
1051 | } |
1052 | ||
1053 | /** | |
1054 | * afu_link_reset() - resets the specified host FC port | |
1055 | * @afu: AFU associated with the host that owns the specified FC port. | |
1056 | * @port: Port number being configured. | |
1057 | * @fc_regs: Top of MMIO region defined for specified port. | |
1058 | * | |
1059 | * The provided MMIO region must be mapped prior to call. The sequence to | |
1060 | * reset the port involves toggling it offline and then back online. This | |
1061 | * action can cause this routine to delay up to a few seconds. An effort | |
1062 | * is made to maintain link with the device by switching to host to use | |
1063 | * the alternate port exclusively while the reset takes place. | |
1064 | * failure to come online is overridden. | |
1065 | */ | |
1786f4a0 | 1066 | static void afu_link_reset(struct afu *afu, int port, __be64 __iomem *fc_regs) |
c21e0bbf MO |
1067 | { |
1068 | u64 port_sel; | |
1069 | ||
1070 | /* first switch the AFU to the other links, if any */ | |
1071 | port_sel = readq_be(&afu->afu_map->global.regs.afu_port_sel); | |
4da74db0 | 1072 | port_sel &= ~(1ULL << port); |
c21e0bbf MO |
1073 | writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); |
1074 | cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); | |
1075 | ||
1076 | set_port_offline(fc_regs); | |
1077 | if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
1078 | FC_PORT_STATUS_RETRY_CNT)) | |
1079 | pr_err("%s: wait on port %d to go offline timed out\n", | |
1080 | __func__, port); | |
1081 | ||
1082 | set_port_online(fc_regs); | |
1083 | if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
1084 | FC_PORT_STATUS_RETRY_CNT)) | |
1085 | pr_err("%s: wait on port %d to go online timed out\n", | |
1086 | __func__, port); | |
1087 | ||
1088 | /* switch back to include this port */ | |
4da74db0 | 1089 | port_sel |= (1ULL << port); |
c21e0bbf MO |
1090 | writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); |
1091 | cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); | |
1092 | ||
1093 | pr_debug("%s: returning port_sel=%lld\n", __func__, port_sel); | |
1094 | } | |
1095 | ||
1096 | /* | |
1097 | * Asynchronous interrupt information table | |
1098 | */ | |
1099 | static const struct asyc_intr_info ainfo[] = { | |
1100 | {SISL_ASTATUS_FC0_OTHER, "other error", 0, CLR_FC_ERROR | LINK_RESET}, | |
1101 | {SISL_ASTATUS_FC0_LOGO, "target initiated LOGO", 0, 0}, | |
1102 | {SISL_ASTATUS_FC0_CRC_T, "CRC threshold exceeded", 0, LINK_RESET}, | |
e6e6df3f | 1103 | {SISL_ASTATUS_FC0_LOGI_R, "login timed out, retrying", 0, LINK_RESET}, |
c21e0bbf | 1104 | {SISL_ASTATUS_FC0_LOGI_F, "login failed", 0, CLR_FC_ERROR}, |
ef51074a | 1105 | {SISL_ASTATUS_FC0_LOGI_S, "login succeeded", 0, SCAN_HOST}, |
c21e0bbf | 1106 | {SISL_ASTATUS_FC0_LINK_DN, "link down", 0, 0}, |
ef51074a | 1107 | {SISL_ASTATUS_FC0_LINK_UP, "link up", 0, SCAN_HOST}, |
c21e0bbf MO |
1108 | {SISL_ASTATUS_FC1_OTHER, "other error", 1, CLR_FC_ERROR | LINK_RESET}, |
1109 | {SISL_ASTATUS_FC1_LOGO, "target initiated LOGO", 1, 0}, | |
1110 | {SISL_ASTATUS_FC1_CRC_T, "CRC threshold exceeded", 1, LINK_RESET}, | |
a9be294e | 1111 | {SISL_ASTATUS_FC1_LOGI_R, "login timed out, retrying", 1, LINK_RESET}, |
c21e0bbf | 1112 | {SISL_ASTATUS_FC1_LOGI_F, "login failed", 1, CLR_FC_ERROR}, |
ef51074a | 1113 | {SISL_ASTATUS_FC1_LOGI_S, "login succeeded", 1, SCAN_HOST}, |
c21e0bbf | 1114 | {SISL_ASTATUS_FC1_LINK_DN, "link down", 1, 0}, |
ef51074a | 1115 | {SISL_ASTATUS_FC1_LINK_UP, "link up", 1, SCAN_HOST}, |
c21e0bbf MO |
1116 | {0x0, "", 0, 0} /* terminator */ |
1117 | }; | |
1118 | ||
1119 | /** | |
1120 | * find_ainfo() - locates and returns asynchronous interrupt information | |
1121 | * @status: Status code set by AFU on error. | |
1122 | * | |
1123 | * Return: The located information or NULL when the status code is invalid. | |
1124 | */ | |
1125 | static const struct asyc_intr_info *find_ainfo(u64 status) | |
1126 | { | |
1127 | const struct asyc_intr_info *info; | |
1128 | ||
1129 | for (info = &ainfo[0]; info->status; info++) | |
1130 | if (info->status == status) | |
1131 | return info; | |
1132 | ||
1133 | return NULL; | |
1134 | } | |
1135 | ||
1136 | /** | |
1137 | * afu_err_intr_init() - clears and initializes the AFU for error interrupts | |
1138 | * @afu: AFU associated with the host. | |
1139 | */ | |
1140 | static void afu_err_intr_init(struct afu *afu) | |
1141 | { | |
1142 | int i; | |
1143 | u64 reg; | |
1144 | ||
1145 | /* global async interrupts: AFU clears afu_ctrl on context exit | |
1146 | * if async interrupts were sent to that context. This prevents | |
1147 | * the AFU form sending further async interrupts when | |
1148 | * there is | |
1149 | * nobody to receive them. | |
1150 | */ | |
1151 | ||
1152 | /* mask all */ | |
1153 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_mask); | |
1154 | /* set LISN# to send and point to master context */ | |
1155 | reg = ((u64) (((afu->ctx_hndl << 8) | SISL_MSI_ASYNC_ERROR)) << 40); | |
1156 | ||
1157 | if (afu->internal_lun) | |
1158 | reg |= 1; /* Bit 63 indicates local lun */ | |
1159 | writeq_be(reg, &afu->afu_map->global.regs.afu_ctrl); | |
1160 | /* clear all */ | |
1161 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); | |
1162 | /* unmask bits that are of interest */ | |
1163 | /* note: afu can send an interrupt after this step */ | |
1164 | writeq_be(SISL_ASTATUS_MASK, &afu->afu_map->global.regs.aintr_mask); | |
1165 | /* clear again in case a bit came on after previous clear but before */ | |
1166 | /* unmask */ | |
1167 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); | |
1168 | ||
1169 | /* Clear/Set internal lun bits */ | |
1170 | reg = readq_be(&afu->afu_map->global.fc_regs[0][FC_CONFIG2 / 8]); | |
1171 | reg &= SISL_FC_INTERNAL_MASK; | |
1172 | if (afu->internal_lun) | |
1173 | reg |= ((u64)(afu->internal_lun - 1) << SISL_FC_INTERNAL_SHIFT); | |
1174 | writeq_be(reg, &afu->afu_map->global.fc_regs[0][FC_CONFIG2 / 8]); | |
1175 | ||
1176 | /* now clear FC errors */ | |
1177 | for (i = 0; i < NUM_FC_PORTS; i++) { | |
1178 | writeq_be(0xFFFFFFFFU, | |
1179 | &afu->afu_map->global.fc_regs[i][FC_ERROR / 8]); | |
1180 | writeq_be(0, &afu->afu_map->global.fc_regs[i][FC_ERRCAP / 8]); | |
1181 | } | |
1182 | ||
1183 | /* sync interrupts for master's IOARRIN write */ | |
1184 | /* note that unlike asyncs, there can be no pending sync interrupts */ | |
1185 | /* at this time (this is a fresh context and master has not written */ | |
1186 | /* IOARRIN yet), so there is nothing to clear. */ | |
1187 | ||
1188 | /* set LISN#, it is always sent to the context that wrote IOARRIN */ | |
1189 | writeq_be(SISL_MSI_SYNC_ERROR, &afu->host_map->ctx_ctrl); | |
1190 | writeq_be(SISL_ISTATUS_MASK, &afu->host_map->intr_mask); | |
1191 | } | |
1192 | ||
1193 | /** | |
1194 | * cxlflash_sync_err_irq() - interrupt handler for synchronous errors | |
1195 | * @irq: Interrupt number. | |
1196 | * @data: Private data provided at interrupt registration, the AFU. | |
1197 | * | |
1198 | * Return: Always return IRQ_HANDLED. | |
1199 | */ | |
1200 | static irqreturn_t cxlflash_sync_err_irq(int irq, void *data) | |
1201 | { | |
1202 | struct afu *afu = (struct afu *)data; | |
1203 | u64 reg; | |
1204 | u64 reg_unmasked; | |
1205 | ||
1206 | reg = readq_be(&afu->host_map->intr_status); | |
1207 | reg_unmasked = (reg & SISL_ISTATUS_UNMASK); | |
1208 | ||
1209 | if (reg_unmasked == 0UL) { | |
1210 | pr_err("%s: %llX: spurious interrupt, intr_status %016llX\n", | |
1211 | __func__, (u64)afu, reg); | |
1212 | goto cxlflash_sync_err_irq_exit; | |
1213 | } | |
1214 | ||
1215 | pr_err("%s: %llX: unexpected interrupt, intr_status %016llX\n", | |
1216 | __func__, (u64)afu, reg); | |
1217 | ||
1218 | writeq_be(reg_unmasked, &afu->host_map->intr_clear); | |
1219 | ||
1220 | cxlflash_sync_err_irq_exit: | |
1221 | pr_debug("%s: returning rc=%d\n", __func__, IRQ_HANDLED); | |
1222 | return IRQ_HANDLED; | |
1223 | } | |
1224 | ||
1225 | /** | |
1226 | * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path) | |
1227 | * @irq: Interrupt number. | |
1228 | * @data: Private data provided at interrupt registration, the AFU. | |
1229 | * | |
1230 | * Return: Always return IRQ_HANDLED. | |
1231 | */ | |
1232 | static irqreturn_t cxlflash_rrq_irq(int irq, void *data) | |
1233 | { | |
1234 | struct afu *afu = (struct afu *)data; | |
1235 | struct afu_cmd *cmd; | |
1236 | bool toggle = afu->toggle; | |
1237 | u64 entry, | |
1238 | *hrrq_start = afu->hrrq_start, | |
1239 | *hrrq_end = afu->hrrq_end, | |
1240 | *hrrq_curr = afu->hrrq_curr; | |
1241 | ||
1242 | /* Process however many RRQ entries that are ready */ | |
1243 | while (true) { | |
1244 | entry = *hrrq_curr; | |
1245 | ||
1246 | if ((entry & SISL_RESP_HANDLE_T_BIT) != toggle) | |
1247 | break; | |
1248 | ||
1249 | cmd = (struct afu_cmd *)(entry & ~SISL_RESP_HANDLE_T_BIT); | |
1250 | cmd_complete(cmd); | |
1251 | ||
1252 | /* Advance to next entry or wrap and flip the toggle bit */ | |
1253 | if (hrrq_curr < hrrq_end) | |
1254 | hrrq_curr++; | |
1255 | else { | |
1256 | hrrq_curr = hrrq_start; | |
1257 | toggle ^= SISL_RESP_HANDLE_T_BIT; | |
1258 | } | |
1259 | } | |
1260 | ||
1261 | afu->hrrq_curr = hrrq_curr; | |
1262 | afu->toggle = toggle; | |
1263 | ||
1264 | return IRQ_HANDLED; | |
1265 | } | |
1266 | ||
1267 | /** | |
1268 | * cxlflash_async_err_irq() - interrupt handler for asynchronous errors | |
1269 | * @irq: Interrupt number. | |
1270 | * @data: Private data provided at interrupt registration, the AFU. | |
1271 | * | |
1272 | * Return: Always return IRQ_HANDLED. | |
1273 | */ | |
1274 | static irqreturn_t cxlflash_async_err_irq(int irq, void *data) | |
1275 | { | |
1276 | struct afu *afu = (struct afu *)data; | |
4392ba49 MO |
1277 | struct cxlflash_cfg *cfg = afu->parent; |
1278 | struct device *dev = &cfg->dev->dev; | |
c21e0bbf MO |
1279 | u64 reg_unmasked; |
1280 | const struct asyc_intr_info *info; | |
1786f4a0 | 1281 | struct sisl_global_map __iomem *global = &afu->afu_map->global; |
c21e0bbf MO |
1282 | u64 reg; |
1283 | u8 port; | |
1284 | int i; | |
1285 | ||
c21e0bbf MO |
1286 | reg = readq_be(&global->regs.aintr_status); |
1287 | reg_unmasked = (reg & SISL_ASTATUS_UNMASK); | |
1288 | ||
1289 | if (reg_unmasked == 0) { | |
4392ba49 MO |
1290 | dev_err(dev, "%s: spurious interrupt, aintr_status 0x%016llX\n", |
1291 | __func__, reg); | |
c21e0bbf MO |
1292 | goto out; |
1293 | } | |
1294 | ||
f15fbf8d | 1295 | /* FYI, it is 'okay' to clear AFU status before FC_ERROR */ |
c21e0bbf MO |
1296 | writeq_be(reg_unmasked, &global->regs.aintr_clear); |
1297 | ||
f15fbf8d | 1298 | /* Check each bit that is on */ |
c21e0bbf MO |
1299 | for (i = 0; reg_unmasked; i++, reg_unmasked = (reg_unmasked >> 1)) { |
1300 | info = find_ainfo(1ULL << i); | |
16798d34 | 1301 | if (((reg_unmasked & 0x1) == 0) || !info) |
c21e0bbf MO |
1302 | continue; |
1303 | ||
1304 | port = info->port; | |
1305 | ||
4392ba49 MO |
1306 | dev_err(dev, "%s: FC Port %d -> %s, fc_status 0x%08llX\n", |
1307 | __func__, port, info->desc, | |
c21e0bbf MO |
1308 | readq_be(&global->fc_regs[port][FC_STATUS / 8])); |
1309 | ||
1310 | /* | |
f15fbf8d | 1311 | * Do link reset first, some OTHER errors will set FC_ERROR |
c21e0bbf MO |
1312 | * again if cleared before or w/o a reset |
1313 | */ | |
1314 | if (info->action & LINK_RESET) { | |
4392ba49 MO |
1315 | dev_err(dev, "%s: FC Port %d: resetting link\n", |
1316 | __func__, port); | |
c21e0bbf MO |
1317 | cfg->lr_state = LINK_RESET_REQUIRED; |
1318 | cfg->lr_port = port; | |
1319 | schedule_work(&cfg->work_q); | |
1320 | } | |
1321 | ||
1322 | if (info->action & CLR_FC_ERROR) { | |
1323 | reg = readq_be(&global->fc_regs[port][FC_ERROR / 8]); | |
1324 | ||
1325 | /* | |
f15fbf8d | 1326 | * Since all errors are unmasked, FC_ERROR and FC_ERRCAP |
c21e0bbf MO |
1327 | * should be the same and tracing one is sufficient. |
1328 | */ | |
1329 | ||
4392ba49 MO |
1330 | dev_err(dev, "%s: fc %d: clearing fc_error 0x%08llX\n", |
1331 | __func__, port, reg); | |
c21e0bbf MO |
1332 | |
1333 | writeq_be(reg, &global->fc_regs[port][FC_ERROR / 8]); | |
1334 | writeq_be(0, &global->fc_regs[port][FC_ERRCAP / 8]); | |
1335 | } | |
ef51074a MO |
1336 | |
1337 | if (info->action & SCAN_HOST) { | |
1338 | atomic_inc(&cfg->scan_host_needed); | |
1339 | schedule_work(&cfg->work_q); | |
1340 | } | |
c21e0bbf MO |
1341 | } |
1342 | ||
1343 | out: | |
4392ba49 | 1344 | dev_dbg(dev, "%s: returning IRQ_HANDLED, afu=%p\n", __func__, afu); |
c21e0bbf MO |
1345 | return IRQ_HANDLED; |
1346 | } | |
1347 | ||
1348 | /** | |
1349 | * start_context() - starts the master context | |
1284fb0c | 1350 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1351 | * |
1352 | * Return: A success or failure value from CXL services. | |
1353 | */ | |
1354 | static int start_context(struct cxlflash_cfg *cfg) | |
1355 | { | |
1356 | int rc = 0; | |
1357 | ||
1358 | rc = cxl_start_context(cfg->mcctx, | |
1359 | cfg->afu->work.work_element_descriptor, | |
1360 | NULL); | |
1361 | ||
1362 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1363 | return rc; | |
1364 | } | |
1365 | ||
1366 | /** | |
1367 | * read_vpd() - obtains the WWPNs from VPD | |
1284fb0c | 1368 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1369 | * @wwpn: Array of size NUM_FC_PORTS to pass back WWPNs |
1370 | * | |
1284fb0c | 1371 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
1372 | */ |
1373 | static int read_vpd(struct cxlflash_cfg *cfg, u64 wwpn[]) | |
1374 | { | |
1375 | struct pci_dev *dev = cfg->parent_dev; | |
1376 | int rc = 0; | |
1377 | int ro_start, ro_size, i, j, k; | |
1378 | ssize_t vpd_size; | |
1379 | char vpd_data[CXLFLASH_VPD_LEN]; | |
1380 | char tmp_buf[WWPN_BUF_LEN] = { 0 }; | |
1381 | char *wwpn_vpd_tags[NUM_FC_PORTS] = { "V5", "V6" }; | |
1382 | ||
1383 | /* Get the VPD data from the device */ | |
1384 | vpd_size = pci_read_vpd(dev, 0, sizeof(vpd_data), vpd_data); | |
1385 | if (unlikely(vpd_size <= 0)) { | |
4392ba49 | 1386 | dev_err(&dev->dev, "%s: Unable to read VPD (size = %ld)\n", |
c21e0bbf MO |
1387 | __func__, vpd_size); |
1388 | rc = -ENODEV; | |
1389 | goto out; | |
1390 | } | |
1391 | ||
1392 | /* Get the read only section offset */ | |
1393 | ro_start = pci_vpd_find_tag(vpd_data, 0, vpd_size, | |
1394 | PCI_VPD_LRDT_RO_DATA); | |
1395 | if (unlikely(ro_start < 0)) { | |
4392ba49 MO |
1396 | dev_err(&dev->dev, "%s: VPD Read-only data not found\n", |
1397 | __func__); | |
c21e0bbf MO |
1398 | rc = -ENODEV; |
1399 | goto out; | |
1400 | } | |
1401 | ||
1402 | /* Get the read only section size, cap when extends beyond read VPD */ | |
1403 | ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]); | |
1404 | j = ro_size; | |
1405 | i = ro_start + PCI_VPD_LRDT_TAG_SIZE; | |
1406 | if (unlikely((i + j) > vpd_size)) { | |
1407 | pr_debug("%s: Might need to read more VPD (%d > %ld)\n", | |
1408 | __func__, (i + j), vpd_size); | |
1409 | ro_size = vpd_size - i; | |
1410 | } | |
1411 | ||
1412 | /* | |
1413 | * Find the offset of the WWPN tag within the read only | |
1414 | * VPD data and validate the found field (partials are | |
1415 | * no good to us). Convert the ASCII data to an integer | |
1416 | * value. Note that we must copy to a temporary buffer | |
1417 | * because the conversion service requires that the ASCII | |
1418 | * string be terminated. | |
1419 | */ | |
1420 | for (k = 0; k < NUM_FC_PORTS; k++) { | |
1421 | j = ro_size; | |
1422 | i = ro_start + PCI_VPD_LRDT_TAG_SIZE; | |
1423 | ||
1424 | i = pci_vpd_find_info_keyword(vpd_data, i, j, wwpn_vpd_tags[k]); | |
1425 | if (unlikely(i < 0)) { | |
4392ba49 MO |
1426 | dev_err(&dev->dev, "%s: Port %d WWPN not found " |
1427 | "in VPD\n", __func__, k); | |
c21e0bbf MO |
1428 | rc = -ENODEV; |
1429 | goto out; | |
1430 | } | |
1431 | ||
1432 | j = pci_vpd_info_field_size(&vpd_data[i]); | |
1433 | i += PCI_VPD_INFO_FLD_HDR_SIZE; | |
1434 | if (unlikely((i + j > vpd_size) || (j != WWPN_LEN))) { | |
4392ba49 MO |
1435 | dev_err(&dev->dev, "%s: Port %d WWPN incomplete or " |
1436 | "VPD corrupt\n", | |
c21e0bbf MO |
1437 | __func__, k); |
1438 | rc = -ENODEV; | |
1439 | goto out; | |
1440 | } | |
1441 | ||
1442 | memcpy(tmp_buf, &vpd_data[i], WWPN_LEN); | |
1443 | rc = kstrtoul(tmp_buf, WWPN_LEN, (ulong *)&wwpn[k]); | |
1444 | if (unlikely(rc)) { | |
4392ba49 MO |
1445 | dev_err(&dev->dev, "%s: Fail to convert port %d WWPN " |
1446 | "to integer\n", __func__, k); | |
c21e0bbf MO |
1447 | rc = -ENODEV; |
1448 | goto out; | |
1449 | } | |
1450 | } | |
1451 | ||
1452 | out: | |
1453 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1454 | return rc; | |
1455 | } | |
1456 | ||
1457 | /** | |
15305514 | 1458 | * init_pcr() - initialize the provisioning and control registers |
1284fb0c | 1459 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 1460 | * |
15305514 MO |
1461 | * Also sets up fast access to the mapped registers and initializes AFU |
1462 | * command fields that never change. | |
c21e0bbf | 1463 | */ |
15305514 | 1464 | static void init_pcr(struct cxlflash_cfg *cfg) |
c21e0bbf MO |
1465 | { |
1466 | struct afu *afu = cfg->afu; | |
1786f4a0 | 1467 | struct sisl_ctrl_map __iomem *ctrl_map; |
c21e0bbf MO |
1468 | int i; |
1469 | ||
1470 | for (i = 0; i < MAX_CONTEXT; i++) { | |
1471 | ctrl_map = &afu->afu_map->ctrls[i].ctrl; | |
f15fbf8d MO |
1472 | /* Disrupt any clients that could be running */ |
1473 | /* e.g. clients that survived a master restart */ | |
c21e0bbf MO |
1474 | writeq_be(0, &ctrl_map->rht_start); |
1475 | writeq_be(0, &ctrl_map->rht_cnt_id); | |
1476 | writeq_be(0, &ctrl_map->ctx_cap); | |
1477 | } | |
1478 | ||
f15fbf8d | 1479 | /* Copy frequently used fields into afu */ |
c21e0bbf | 1480 | afu->ctx_hndl = (u16) cxl_process_element(cfg->mcctx); |
c21e0bbf MO |
1481 | afu->host_map = &afu->afu_map->hosts[afu->ctx_hndl].host; |
1482 | afu->ctrl_map = &afu->afu_map->ctrls[afu->ctx_hndl].ctrl; | |
1483 | ||
1484 | /* Program the Endian Control for the master context */ | |
1485 | writeq_be(SISL_ENDIAN_CTRL, &afu->host_map->endian_ctrl); | |
1486 | ||
f15fbf8d | 1487 | /* Initialize cmd fields that never change */ |
c21e0bbf MO |
1488 | for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { |
1489 | afu->cmd[i].rcb.ctx_id = afu->ctx_hndl; | |
1490 | afu->cmd[i].rcb.msi = SISL_MSI_RRQ_UPDATED; | |
1491 | afu->cmd[i].rcb.rrq = 0x0; | |
1492 | } | |
1493 | } | |
1494 | ||
1495 | /** | |
1496 | * init_global() - initialize AFU global registers | |
1284fb0c | 1497 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 1498 | */ |
15305514 | 1499 | static int init_global(struct cxlflash_cfg *cfg) |
c21e0bbf MO |
1500 | { |
1501 | struct afu *afu = cfg->afu; | |
4392ba49 | 1502 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
1503 | u64 wwpn[NUM_FC_PORTS]; /* wwpn of AFU ports */ |
1504 | int i = 0, num_ports = 0; | |
1505 | int rc = 0; | |
1506 | u64 reg; | |
1507 | ||
1508 | rc = read_vpd(cfg, &wwpn[0]); | |
1509 | if (rc) { | |
4392ba49 | 1510 | dev_err(dev, "%s: could not read vpd rc=%d\n", __func__, rc); |
c21e0bbf MO |
1511 | goto out; |
1512 | } | |
1513 | ||
1514 | pr_debug("%s: wwpn0=0x%llX wwpn1=0x%llX\n", __func__, wwpn[0], wwpn[1]); | |
1515 | ||
f15fbf8d | 1516 | /* Set up RRQ in AFU for master issued cmds */ |
c21e0bbf MO |
1517 | writeq_be((u64) afu->hrrq_start, &afu->host_map->rrq_start); |
1518 | writeq_be((u64) afu->hrrq_end, &afu->host_map->rrq_end); | |
1519 | ||
1520 | /* AFU configuration */ | |
1521 | reg = readq_be(&afu->afu_map->global.regs.afu_config); | |
1522 | reg |= SISL_AFUCONF_AR_ALL|SISL_AFUCONF_ENDIAN; | |
1523 | /* enable all auto retry options and control endianness */ | |
1524 | /* leave others at default: */ | |
1525 | /* CTX_CAP write protected, mbox_r does not clear on read and */ | |
1526 | /* checker on if dual afu */ | |
1527 | writeq_be(reg, &afu->afu_map->global.regs.afu_config); | |
1528 | ||
f15fbf8d | 1529 | /* Global port select: select either port */ |
c21e0bbf | 1530 | if (afu->internal_lun) { |
f15fbf8d | 1531 | /* Only use port 0 */ |
c21e0bbf MO |
1532 | writeq_be(PORT0, &afu->afu_map->global.regs.afu_port_sel); |
1533 | num_ports = NUM_FC_PORTS - 1; | |
1534 | } else { | |
1535 | writeq_be(BOTH_PORTS, &afu->afu_map->global.regs.afu_port_sel); | |
1536 | num_ports = NUM_FC_PORTS; | |
1537 | } | |
1538 | ||
1539 | for (i = 0; i < num_ports; i++) { | |
f15fbf8d | 1540 | /* Unmask all errors (but they are still masked at AFU) */ |
c21e0bbf | 1541 | writeq_be(0, &afu->afu_map->global.fc_regs[i][FC_ERRMSK / 8]); |
f15fbf8d | 1542 | /* Clear CRC error cnt & set a threshold */ |
c21e0bbf MO |
1543 | (void)readq_be(&afu->afu_map->global. |
1544 | fc_regs[i][FC_CNT_CRCERR / 8]); | |
1545 | writeq_be(MC_CRC_THRESH, &afu->afu_map->global.fc_regs[i] | |
1546 | [FC_CRC_THRESH / 8]); | |
1547 | ||
f15fbf8d | 1548 | /* Set WWPNs. If already programmed, wwpn[i] is 0 */ |
c21e0bbf MO |
1549 | if (wwpn[i] != 0 && |
1550 | afu_set_wwpn(afu, i, | |
1551 | &afu->afu_map->global.fc_regs[i][0], | |
1552 | wwpn[i])) { | |
4392ba49 | 1553 | dev_err(dev, "%s: failed to set WWPN on port %d\n", |
c21e0bbf MO |
1554 | __func__, i); |
1555 | rc = -EIO; | |
1556 | goto out; | |
1557 | } | |
1558 | /* Programming WWPN back to back causes additional | |
1559 | * offline/online transitions and a PLOGI | |
1560 | */ | |
1561 | msleep(100); | |
c21e0bbf MO |
1562 | } |
1563 | ||
f15fbf8d MO |
1564 | /* Set up master's own CTX_CAP to allow real mode, host translation */ |
1565 | /* tables, afu cmds and read/write GSCSI cmds. */ | |
c21e0bbf MO |
1566 | /* First, unlock ctx_cap write by reading mbox */ |
1567 | (void)readq_be(&afu->ctrl_map->mbox_r); /* unlock ctx_cap */ | |
1568 | writeq_be((SISL_CTX_CAP_REAL_MODE | SISL_CTX_CAP_HOST_XLATE | | |
1569 | SISL_CTX_CAP_READ_CMD | SISL_CTX_CAP_WRITE_CMD | | |
1570 | SISL_CTX_CAP_AFU_CMD | SISL_CTX_CAP_GSCSI_CMD), | |
1571 | &afu->ctrl_map->ctx_cap); | |
f15fbf8d | 1572 | /* Initialize heartbeat */ |
c21e0bbf MO |
1573 | afu->hb = readq_be(&afu->afu_map->global.regs.afu_hb); |
1574 | ||
1575 | out: | |
1576 | return rc; | |
1577 | } | |
1578 | ||
1579 | /** | |
1580 | * start_afu() - initializes and starts the AFU | |
1284fb0c | 1581 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1582 | */ |
1583 | static int start_afu(struct cxlflash_cfg *cfg) | |
1584 | { | |
1585 | struct afu *afu = cfg->afu; | |
1586 | struct afu_cmd *cmd; | |
1587 | ||
1588 | int i = 0; | |
1589 | int rc = 0; | |
1590 | ||
1591 | for (i = 0; i < CXLFLASH_NUM_CMDS; i++) { | |
1592 | cmd = &afu->cmd[i]; | |
1593 | ||
1594 | init_completion(&cmd->cevent); | |
1595 | spin_lock_init(&cmd->slock); | |
1596 | cmd->parent = afu; | |
1597 | } | |
1598 | ||
1599 | init_pcr(cfg); | |
1600 | ||
af10483e MO |
1601 | /* After an AFU reset, RRQ entries are stale, clear them */ |
1602 | memset(&afu->rrq_entry, 0, sizeof(afu->rrq_entry)); | |
1603 | ||
f15fbf8d | 1604 | /* Initialize RRQ pointers */ |
c21e0bbf MO |
1605 | afu->hrrq_start = &afu->rrq_entry[0]; |
1606 | afu->hrrq_end = &afu->rrq_entry[NUM_RRQ_ENTRY - 1]; | |
1607 | afu->hrrq_curr = afu->hrrq_start; | |
1608 | afu->toggle = 1; | |
1609 | ||
1610 | rc = init_global(cfg); | |
1611 | ||
1612 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1613 | return rc; | |
1614 | } | |
1615 | ||
1616 | /** | |
1617 | * init_mc() - create and register as the master context | |
1284fb0c | 1618 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 1619 | * |
1284fb0c | 1620 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
1621 | */ |
1622 | static int init_mc(struct cxlflash_cfg *cfg) | |
1623 | { | |
1624 | struct cxl_context *ctx; | |
1625 | struct device *dev = &cfg->dev->dev; | |
1626 | struct afu *afu = cfg->afu; | |
1627 | int rc = 0; | |
1628 | enum undo_level level; | |
1629 | ||
1630 | ctx = cxl_get_context(cfg->dev); | |
1631 | if (unlikely(!ctx)) | |
1632 | return -ENOMEM; | |
1633 | cfg->mcctx = ctx; | |
1634 | ||
1635 | /* Set it up as a master with the CXL */ | |
1636 | cxl_set_master(ctx); | |
1637 | ||
1638 | /* During initialization reset the AFU to start from a clean slate */ | |
1639 | rc = cxl_afu_reset(cfg->mcctx); | |
1640 | if (unlikely(rc)) { | |
1641 | dev_err(dev, "%s: initial AFU reset failed rc=%d\n", | |
1642 | __func__, rc); | |
1643 | level = RELEASE_CONTEXT; | |
1644 | goto out; | |
1645 | } | |
1646 | ||
1647 | rc = cxl_allocate_afu_irqs(ctx, 3); | |
1648 | if (unlikely(rc)) { | |
1649 | dev_err(dev, "%s: call to allocate_afu_irqs failed rc=%d!\n", | |
1650 | __func__, rc); | |
1651 | level = RELEASE_CONTEXT; | |
1652 | goto out; | |
1653 | } | |
1654 | ||
1655 | rc = cxl_map_afu_irq(ctx, 1, cxlflash_sync_err_irq, afu, | |
1656 | "SISL_MSI_SYNC_ERROR"); | |
1657 | if (unlikely(rc <= 0)) { | |
1658 | dev_err(dev, "%s: IRQ 1 (SISL_MSI_SYNC_ERROR) map failed!\n", | |
1659 | __func__); | |
1660 | level = FREE_IRQ; | |
1661 | goto out; | |
1662 | } | |
1663 | ||
1664 | rc = cxl_map_afu_irq(ctx, 2, cxlflash_rrq_irq, afu, | |
1665 | "SISL_MSI_RRQ_UPDATED"); | |
1666 | if (unlikely(rc <= 0)) { | |
1667 | dev_err(dev, "%s: IRQ 2 (SISL_MSI_RRQ_UPDATED) map failed!\n", | |
1668 | __func__); | |
1669 | level = UNMAP_ONE; | |
1670 | goto out; | |
1671 | } | |
1672 | ||
1673 | rc = cxl_map_afu_irq(ctx, 3, cxlflash_async_err_irq, afu, | |
1674 | "SISL_MSI_ASYNC_ERROR"); | |
1675 | if (unlikely(rc <= 0)) { | |
1676 | dev_err(dev, "%s: IRQ 3 (SISL_MSI_ASYNC_ERROR) map failed!\n", | |
1677 | __func__); | |
1678 | level = UNMAP_TWO; | |
1679 | goto out; | |
1680 | } | |
1681 | ||
1682 | rc = 0; | |
1683 | ||
1684 | /* This performs the equivalent of the CXL_IOCTL_START_WORK. | |
1685 | * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process | |
1686 | * element (pe) that is embedded in the context (ctx) | |
1687 | */ | |
1688 | rc = start_context(cfg); | |
1689 | if (unlikely(rc)) { | |
1690 | dev_err(dev, "%s: start context failed rc=%d\n", __func__, rc); | |
1691 | level = UNMAP_THREE; | |
1692 | goto out; | |
1693 | } | |
1694 | ret: | |
1695 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1696 | return rc; | |
1697 | out: | |
1698 | term_mc(cfg, level); | |
1699 | goto ret; | |
1700 | } | |
1701 | ||
1702 | /** | |
1703 | * init_afu() - setup as master context and start AFU | |
1284fb0c | 1704 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1705 | * |
1706 | * This routine is a higher level of control for configuring the | |
1707 | * AFU on probe and reset paths. | |
1708 | * | |
1284fb0c | 1709 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
1710 | */ |
1711 | static int init_afu(struct cxlflash_cfg *cfg) | |
1712 | { | |
1713 | u64 reg; | |
1714 | int rc = 0; | |
1715 | struct afu *afu = cfg->afu; | |
1716 | struct device *dev = &cfg->dev->dev; | |
1717 | ||
5cdac81a MO |
1718 | cxl_perst_reloads_same_image(cfg->cxl_afu, true); |
1719 | ||
c21e0bbf MO |
1720 | rc = init_mc(cfg); |
1721 | if (rc) { | |
1722 | dev_err(dev, "%s: call to init_mc failed, rc=%d!\n", | |
1723 | __func__, rc); | |
ee3491ba | 1724 | goto out; |
c21e0bbf MO |
1725 | } |
1726 | ||
f15fbf8d | 1727 | /* Map the entire MMIO space of the AFU */ |
c21e0bbf MO |
1728 | afu->afu_map = cxl_psa_map(cfg->mcctx); |
1729 | if (!afu->afu_map) { | |
c21e0bbf | 1730 | dev_err(dev, "%s: call to cxl_psa_map failed!\n", __func__); |
ee3491ba | 1731 | rc = -ENOMEM; |
c21e0bbf MO |
1732 | goto err1; |
1733 | } | |
1734 | ||
e5ce067b MO |
1735 | /* No byte reverse on reading afu_version or string will be backwards */ |
1736 | reg = readq(&afu->afu_map->global.regs.afu_version); | |
1737 | memcpy(afu->version, ®, sizeof(reg)); | |
c21e0bbf MO |
1738 | afu->interface_version = |
1739 | readq_be(&afu->afu_map->global.regs.interface_version); | |
e5ce067b MO |
1740 | if ((afu->interface_version + 1) == 0) { |
1741 | pr_err("Back level AFU, please upgrade. AFU version %s " | |
1742 | "interface version 0x%llx\n", afu->version, | |
1743 | afu->interface_version); | |
1744 | rc = -EINVAL; | |
ee3491ba MO |
1745 | goto err2; |
1746 | } | |
1747 | ||
1748 | pr_debug("%s: afu version %s, interface version 0x%llX\n", __func__, | |
1749 | afu->version, afu->interface_version); | |
c21e0bbf MO |
1750 | |
1751 | rc = start_afu(cfg); | |
1752 | if (rc) { | |
1753 | dev_err(dev, "%s: call to start_afu failed, rc=%d!\n", | |
1754 | __func__, rc); | |
ee3491ba | 1755 | goto err2; |
c21e0bbf MO |
1756 | } |
1757 | ||
1758 | afu_err_intr_init(cfg->afu); | |
1759 | atomic64_set(&afu->room, readq_be(&afu->host_map->cmd_room)); | |
1760 | ||
2cb79266 MO |
1761 | /* Restore the LUN mappings */ |
1762 | cxlflash_restore_luntable(cfg); | |
ee3491ba | 1763 | out: |
c21e0bbf MO |
1764 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
1765 | return rc; | |
ee3491ba MO |
1766 | |
1767 | err2: | |
1768 | cxl_psa_unmap((void __iomem *)afu->afu_map); | |
1769 | afu->afu_map = NULL; | |
1770 | err1: | |
1771 | term_mc(cfg, UNDO_START); | |
1772 | goto out; | |
c21e0bbf MO |
1773 | } |
1774 | ||
c21e0bbf MO |
1775 | /** |
1776 | * cxlflash_afu_sync() - builds and sends an AFU sync command | |
1777 | * @afu: AFU associated with the host. | |
1778 | * @ctx_hndl_u: Identifies context requesting sync. | |
1779 | * @res_hndl_u: Identifies resource requesting sync. | |
1780 | * @mode: Type of sync to issue (lightweight, heavyweight, global). | |
1781 | * | |
1782 | * The AFU can only take 1 sync command at a time. This routine enforces this | |
f15fbf8d | 1783 | * limitation by using a mutex to provide exclusive access to the AFU during |
c21e0bbf MO |
1784 | * the sync. This design point requires calling threads to not be on interrupt |
1785 | * context due to the possibility of sleeping during concurrent sync operations. | |
1786 | * | |
5cdac81a MO |
1787 | * AFU sync operations are only necessary and allowed when the device is |
1788 | * operating normally. When not operating normally, sync requests can occur as | |
1789 | * part of cleaning up resources associated with an adapter prior to removal. | |
1790 | * In this scenario, these requests are simply ignored (safe due to the AFU | |
1791 | * going away). | |
1792 | * | |
c21e0bbf MO |
1793 | * Return: |
1794 | * 0 on success | |
1795 | * -1 on failure | |
1796 | */ | |
1797 | int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t ctx_hndl_u, | |
1798 | res_hndl_t res_hndl_u, u8 mode) | |
1799 | { | |
5cdac81a | 1800 | struct cxlflash_cfg *cfg = afu->parent; |
4392ba49 | 1801 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
1802 | struct afu_cmd *cmd = NULL; |
1803 | int rc = 0; | |
1804 | int retry_cnt = 0; | |
1805 | static DEFINE_MUTEX(sync_active); | |
1806 | ||
5cdac81a MO |
1807 | if (cfg->state != STATE_NORMAL) { |
1808 | pr_debug("%s: Sync not required! (%u)\n", __func__, cfg->state); | |
1809 | return 0; | |
1810 | } | |
1811 | ||
c21e0bbf MO |
1812 | mutex_lock(&sync_active); |
1813 | retry: | |
15305514 | 1814 | cmd = cmd_checkout(afu); |
c21e0bbf MO |
1815 | if (unlikely(!cmd)) { |
1816 | retry_cnt++; | |
1817 | udelay(1000 * retry_cnt); | |
1818 | if (retry_cnt < MC_RETRY_CNT) | |
1819 | goto retry; | |
4392ba49 | 1820 | dev_err(dev, "%s: could not get a free command\n", __func__); |
c21e0bbf MO |
1821 | rc = -1; |
1822 | goto out; | |
1823 | } | |
1824 | ||
1825 | pr_debug("%s: afu=%p cmd=%p %d\n", __func__, afu, cmd, ctx_hndl_u); | |
1826 | ||
1827 | memset(cmd->rcb.cdb, 0, sizeof(cmd->rcb.cdb)); | |
1828 | ||
1829 | cmd->rcb.req_flags = SISL_REQ_FLAGS_AFU_CMD; | |
1830 | cmd->rcb.port_sel = 0x0; /* NA */ | |
1831 | cmd->rcb.lun_id = 0x0; /* NA */ | |
1832 | cmd->rcb.data_len = 0x0; | |
1833 | cmd->rcb.data_ea = 0x0; | |
1834 | cmd->rcb.timeout = MC_AFU_SYNC_TIMEOUT; | |
1835 | ||
1836 | cmd->rcb.cdb[0] = 0xC0; /* AFU Sync */ | |
1837 | cmd->rcb.cdb[1] = mode; | |
1838 | ||
1839 | /* The cdb is aligned, no unaligned accessors required */ | |
1786f4a0 MO |
1840 | *((__be16 *)&cmd->rcb.cdb[2]) = cpu_to_be16(ctx_hndl_u); |
1841 | *((__be32 *)&cmd->rcb.cdb[4]) = cpu_to_be32(res_hndl_u); | |
c21e0bbf | 1842 | |
15305514 | 1843 | rc = send_cmd(afu, cmd); |
c21e0bbf MO |
1844 | if (unlikely(rc)) |
1845 | goto out; | |
1846 | ||
15305514 | 1847 | wait_resp(afu, cmd); |
c21e0bbf | 1848 | |
f15fbf8d | 1849 | /* Set on timeout */ |
c21e0bbf MO |
1850 | if (unlikely((cmd->sa.ioasc != 0) || |
1851 | (cmd->sa.host_use_b[0] & B_ERROR))) | |
1852 | rc = -1; | |
1853 | out: | |
1854 | mutex_unlock(&sync_active); | |
1855 | if (cmd) | |
15305514 | 1856 | cmd_checkin(cmd); |
c21e0bbf MO |
1857 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
1858 | return rc; | |
1859 | } | |
1860 | ||
1861 | /** | |
15305514 MO |
1862 | * afu_reset() - resets the AFU |
1863 | * @cfg: Internal structure associated with the host. | |
c21e0bbf | 1864 | * |
1284fb0c | 1865 | * Return: 0 on success, -errno on failure |
c21e0bbf | 1866 | */ |
15305514 | 1867 | static int afu_reset(struct cxlflash_cfg *cfg) |
c21e0bbf MO |
1868 | { |
1869 | int rc = 0; | |
1870 | /* Stop the context before the reset. Since the context is | |
1871 | * no longer available restart it after the reset is complete | |
1872 | */ | |
1873 | ||
1874 | term_afu(cfg); | |
1875 | ||
1876 | rc = init_afu(cfg); | |
1877 | ||
1878 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1879 | return rc; | |
1880 | } | |
1881 | ||
15305514 MO |
1882 | /** |
1883 | * cxlflash_eh_device_reset_handler() - reset a single LUN | |
1884 | * @scp: SCSI command to send. | |
1885 | * | |
1886 | * Return: | |
1887 | * SUCCESS as defined in scsi/scsi.h | |
1888 | * FAILED as defined in scsi/scsi.h | |
1889 | */ | |
1890 | static int cxlflash_eh_device_reset_handler(struct scsi_cmnd *scp) | |
1891 | { | |
1892 | int rc = SUCCESS; | |
1893 | struct Scsi_Host *host = scp->device->host; | |
1894 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; | |
1895 | struct afu *afu = cfg->afu; | |
1896 | int rcr = 0; | |
1897 | ||
1898 | pr_debug("%s: (scp=%p) %d/%d/%d/%llu " | |
1899 | "cdb=(%08X-%08X-%08X-%08X)\n", __func__, scp, | |
1900 | host->host_no, scp->device->channel, | |
1901 | scp->device->id, scp->device->lun, | |
1902 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
1903 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
1904 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
1905 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
1906 | ||
ed486daa | 1907 | retry: |
15305514 MO |
1908 | switch (cfg->state) { |
1909 | case STATE_NORMAL: | |
1910 | rcr = send_tmf(afu, scp, TMF_LUN_RESET); | |
1911 | if (unlikely(rcr)) | |
1912 | rc = FAILED; | |
1913 | break; | |
1914 | case STATE_RESET: | |
1915 | wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); | |
ed486daa | 1916 | goto retry; |
15305514 MO |
1917 | default: |
1918 | rc = FAILED; | |
1919 | break; | |
1920 | } | |
1921 | ||
1922 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1923 | return rc; | |
1924 | } | |
1925 | ||
1926 | /** | |
1927 | * cxlflash_eh_host_reset_handler() - reset the host adapter | |
1928 | * @scp: SCSI command from stack identifying host. | |
1929 | * | |
1930 | * Return: | |
1931 | * SUCCESS as defined in scsi/scsi.h | |
1932 | * FAILED as defined in scsi/scsi.h | |
1933 | */ | |
1934 | static int cxlflash_eh_host_reset_handler(struct scsi_cmnd *scp) | |
1935 | { | |
1936 | int rc = SUCCESS; | |
1937 | int rcr = 0; | |
1938 | struct Scsi_Host *host = scp->device->host; | |
1939 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; | |
1940 | ||
1941 | pr_debug("%s: (scp=%p) %d/%d/%d/%llu " | |
1942 | "cdb=(%08X-%08X-%08X-%08X)\n", __func__, scp, | |
1943 | host->host_no, scp->device->channel, | |
1944 | scp->device->id, scp->device->lun, | |
1945 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
1946 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
1947 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
1948 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
1949 | ||
1950 | switch (cfg->state) { | |
1951 | case STATE_NORMAL: | |
1952 | cfg->state = STATE_RESET; | |
15305514 MO |
1953 | cxlflash_mark_contexts_error(cfg); |
1954 | rcr = afu_reset(cfg); | |
1955 | if (rcr) { | |
1956 | rc = FAILED; | |
1957 | cfg->state = STATE_FAILTERM; | |
1958 | } else | |
1959 | cfg->state = STATE_NORMAL; | |
1960 | wake_up_all(&cfg->reset_waitq); | |
15305514 MO |
1961 | break; |
1962 | case STATE_RESET: | |
1963 | wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); | |
1964 | if (cfg->state == STATE_NORMAL) | |
1965 | break; | |
1966 | /* fall through */ | |
1967 | default: | |
1968 | rc = FAILED; | |
1969 | break; | |
1970 | } | |
1971 | ||
1972 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1973 | return rc; | |
1974 | } | |
1975 | ||
1976 | /** | |
1977 | * cxlflash_change_queue_depth() - change the queue depth for the device | |
1978 | * @sdev: SCSI device destined for queue depth change. | |
1979 | * @qdepth: Requested queue depth value to set. | |
1980 | * | |
1981 | * The requested queue depth is capped to the maximum supported value. | |
1982 | * | |
1983 | * Return: The actual queue depth set. | |
1984 | */ | |
1985 | static int cxlflash_change_queue_depth(struct scsi_device *sdev, int qdepth) | |
1986 | { | |
1987 | ||
1988 | if (qdepth > CXLFLASH_MAX_CMDS_PER_LUN) | |
1989 | qdepth = CXLFLASH_MAX_CMDS_PER_LUN; | |
1990 | ||
1991 | scsi_change_queue_depth(sdev, qdepth); | |
1992 | return sdev->queue_depth; | |
1993 | } | |
1994 | ||
1995 | /** | |
1996 | * cxlflash_show_port_status() - queries and presents the current port status | |
e0f01a21 MO |
1997 | * @port: Desired port for status reporting. |
1998 | * @afu: AFU owning the specified port. | |
15305514 MO |
1999 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. |
2000 | * | |
2001 | * Return: The size of the ASCII string returned in @buf. | |
2002 | */ | |
e0f01a21 | 2003 | static ssize_t cxlflash_show_port_status(u32 port, struct afu *afu, char *buf) |
15305514 | 2004 | { |
15305514 | 2005 | char *disp_status; |
15305514 | 2006 | u64 status; |
e0f01a21 | 2007 | __be64 __iomem *fc_regs; |
15305514 | 2008 | |
e0f01a21 | 2009 | if (port >= NUM_FC_PORTS) |
15305514 MO |
2010 | return 0; |
2011 | ||
2012 | fc_regs = &afu->afu_map->global.fc_regs[port][0]; | |
e0f01a21 MO |
2013 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); |
2014 | status &= FC_MTIP_STATUS_MASK; | |
15305514 MO |
2015 | |
2016 | if (status == FC_MTIP_STATUS_ONLINE) | |
2017 | disp_status = "online"; | |
2018 | else if (status == FC_MTIP_STATUS_OFFLINE) | |
2019 | disp_status = "offline"; | |
2020 | else | |
2021 | disp_status = "unknown"; | |
2022 | ||
e0f01a21 MO |
2023 | return scnprintf(buf, PAGE_SIZE, "%s\n", disp_status); |
2024 | } | |
2025 | ||
2026 | /** | |
2027 | * port0_show() - queries and presents the current status of port 0 | |
2028 | * @dev: Generic device associated with the host owning the port. | |
2029 | * @attr: Device attribute representing the port. | |
2030 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2031 | * | |
2032 | * Return: The size of the ASCII string returned in @buf. | |
2033 | */ | |
2034 | static ssize_t port0_show(struct device *dev, | |
2035 | struct device_attribute *attr, | |
2036 | char *buf) | |
2037 | { | |
2038 | struct Scsi_Host *shost = class_to_shost(dev); | |
2039 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
2040 | struct afu *afu = cfg->afu; | |
2041 | ||
2042 | return cxlflash_show_port_status(0, afu, buf); | |
15305514 MO |
2043 | } |
2044 | ||
2045 | /** | |
e0f01a21 MO |
2046 | * port1_show() - queries and presents the current status of port 1 |
2047 | * @dev: Generic device associated with the host owning the port. | |
2048 | * @attr: Device attribute representing the port. | |
2049 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2050 | * | |
2051 | * Return: The size of the ASCII string returned in @buf. | |
2052 | */ | |
2053 | static ssize_t port1_show(struct device *dev, | |
2054 | struct device_attribute *attr, | |
2055 | char *buf) | |
2056 | { | |
2057 | struct Scsi_Host *shost = class_to_shost(dev); | |
2058 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
2059 | struct afu *afu = cfg->afu; | |
2060 | ||
2061 | return cxlflash_show_port_status(1, afu, buf); | |
2062 | } | |
2063 | ||
2064 | /** | |
2065 | * lun_mode_show() - presents the current LUN mode of the host | |
15305514 | 2066 | * @dev: Generic device associated with the host. |
e0f01a21 | 2067 | * @attr: Device attribute representing the LUN mode. |
15305514 MO |
2068 | * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII. |
2069 | * | |
2070 | * Return: The size of the ASCII string returned in @buf. | |
2071 | */ | |
e0f01a21 MO |
2072 | static ssize_t lun_mode_show(struct device *dev, |
2073 | struct device_attribute *attr, char *buf) | |
15305514 MO |
2074 | { |
2075 | struct Scsi_Host *shost = class_to_shost(dev); | |
2076 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
2077 | struct afu *afu = cfg->afu; | |
2078 | ||
e0f01a21 | 2079 | return scnprintf(buf, PAGE_SIZE, "%u\n", afu->internal_lun); |
15305514 MO |
2080 | } |
2081 | ||
2082 | /** | |
e0f01a21 | 2083 | * lun_mode_store() - sets the LUN mode of the host |
15305514 | 2084 | * @dev: Generic device associated with the host. |
e0f01a21 | 2085 | * @attr: Device attribute representing the LUN mode. |
15305514 MO |
2086 | * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII. |
2087 | * @count: Length of data resizing in @buf. | |
2088 | * | |
2089 | * The CXL Flash AFU supports a dummy LUN mode where the external | |
2090 | * links and storage are not required. Space on the FPGA is used | |
2091 | * to create 1 or 2 small LUNs which are presented to the system | |
2092 | * as if they were a normal storage device. This feature is useful | |
2093 | * during development and also provides manufacturing with a way | |
2094 | * to test the AFU without an actual device. | |
2095 | * | |
2096 | * 0 = external LUN[s] (default) | |
2097 | * 1 = internal LUN (1 x 64K, 512B blocks, id 0) | |
2098 | * 2 = internal LUN (1 x 64K, 4K blocks, id 0) | |
2099 | * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1) | |
2100 | * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1) | |
2101 | * | |
2102 | * Return: The size of the ASCII string returned in @buf. | |
2103 | */ | |
e0f01a21 MO |
2104 | static ssize_t lun_mode_store(struct device *dev, |
2105 | struct device_attribute *attr, | |
2106 | const char *buf, size_t count) | |
15305514 MO |
2107 | { |
2108 | struct Scsi_Host *shost = class_to_shost(dev); | |
2109 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
2110 | struct afu *afu = cfg->afu; | |
2111 | int rc; | |
2112 | u32 lun_mode; | |
2113 | ||
2114 | rc = kstrtouint(buf, 10, &lun_mode); | |
2115 | if (!rc && (lun_mode < 5) && (lun_mode != afu->internal_lun)) { | |
2116 | afu->internal_lun = lun_mode; | |
2117 | afu_reset(cfg); | |
2118 | scsi_scan_host(cfg->host); | |
2119 | } | |
2120 | ||
2121 | return count; | |
2122 | } | |
2123 | ||
2124 | /** | |
e0f01a21 | 2125 | * ioctl_version_show() - presents the current ioctl version of the host |
15305514 MO |
2126 | * @dev: Generic device associated with the host. |
2127 | * @attr: Device attribute representing the ioctl version. | |
2128 | * @buf: Buffer of length PAGE_SIZE to report back the ioctl version. | |
2129 | * | |
2130 | * Return: The size of the ASCII string returned in @buf. | |
2131 | */ | |
e0f01a21 MO |
2132 | static ssize_t ioctl_version_show(struct device *dev, |
2133 | struct device_attribute *attr, char *buf) | |
15305514 MO |
2134 | { |
2135 | return scnprintf(buf, PAGE_SIZE, "%u\n", DK_CXLFLASH_VERSION_0); | |
2136 | } | |
2137 | ||
2138 | /** | |
e0f01a21 MO |
2139 | * cxlflash_show_port_lun_table() - queries and presents the port LUN table |
2140 | * @port: Desired port for status reporting. | |
2141 | * @afu: AFU owning the specified port. | |
2142 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2143 | * | |
2144 | * Return: The size of the ASCII string returned in @buf. | |
2145 | */ | |
2146 | static ssize_t cxlflash_show_port_lun_table(u32 port, | |
2147 | struct afu *afu, | |
2148 | char *buf) | |
2149 | { | |
2150 | int i; | |
2151 | ssize_t bytes = 0; | |
2152 | __be64 __iomem *fc_port; | |
2153 | ||
2154 | if (port >= NUM_FC_PORTS) | |
2155 | return 0; | |
2156 | ||
2157 | fc_port = &afu->afu_map->global.fc_port[port][0]; | |
2158 | ||
2159 | for (i = 0; i < CXLFLASH_NUM_VLUNS; i++) | |
2160 | bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes, | |
2161 | "%03d: %016llX\n", i, readq_be(&fc_port[i])); | |
2162 | return bytes; | |
2163 | } | |
2164 | ||
2165 | /** | |
2166 | * port0_lun_table_show() - presents the current LUN table of port 0 | |
2167 | * @dev: Generic device associated with the host owning the port. | |
2168 | * @attr: Device attribute representing the port. | |
2169 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2170 | * | |
2171 | * Return: The size of the ASCII string returned in @buf. | |
2172 | */ | |
2173 | static ssize_t port0_lun_table_show(struct device *dev, | |
2174 | struct device_attribute *attr, | |
2175 | char *buf) | |
2176 | { | |
2177 | struct Scsi_Host *shost = class_to_shost(dev); | |
2178 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
2179 | struct afu *afu = cfg->afu; | |
2180 | ||
2181 | return cxlflash_show_port_lun_table(0, afu, buf); | |
2182 | } | |
2183 | ||
2184 | /** | |
2185 | * port1_lun_table_show() - presents the current LUN table of port 1 | |
2186 | * @dev: Generic device associated with the host owning the port. | |
2187 | * @attr: Device attribute representing the port. | |
2188 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2189 | * | |
2190 | * Return: The size of the ASCII string returned in @buf. | |
2191 | */ | |
2192 | static ssize_t port1_lun_table_show(struct device *dev, | |
2193 | struct device_attribute *attr, | |
2194 | char *buf) | |
2195 | { | |
2196 | struct Scsi_Host *shost = class_to_shost(dev); | |
2197 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
2198 | struct afu *afu = cfg->afu; | |
2199 | ||
2200 | return cxlflash_show_port_lun_table(1, afu, buf); | |
2201 | } | |
2202 | ||
2203 | /** | |
2204 | * mode_show() - presents the current mode of the device | |
15305514 MO |
2205 | * @dev: Generic device associated with the device. |
2206 | * @attr: Device attribute representing the device mode. | |
2207 | * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII. | |
2208 | * | |
2209 | * Return: The size of the ASCII string returned in @buf. | |
2210 | */ | |
e0f01a21 MO |
2211 | static ssize_t mode_show(struct device *dev, |
2212 | struct device_attribute *attr, char *buf) | |
15305514 MO |
2213 | { |
2214 | struct scsi_device *sdev = to_scsi_device(dev); | |
2215 | ||
e0f01a21 MO |
2216 | return scnprintf(buf, PAGE_SIZE, "%s\n", |
2217 | sdev->hostdata ? "superpipe" : "legacy"); | |
15305514 MO |
2218 | } |
2219 | ||
2220 | /* | |
2221 | * Host attributes | |
2222 | */ | |
e0f01a21 MO |
2223 | static DEVICE_ATTR_RO(port0); |
2224 | static DEVICE_ATTR_RO(port1); | |
2225 | static DEVICE_ATTR_RW(lun_mode); | |
2226 | static DEVICE_ATTR_RO(ioctl_version); | |
2227 | static DEVICE_ATTR_RO(port0_lun_table); | |
2228 | static DEVICE_ATTR_RO(port1_lun_table); | |
15305514 MO |
2229 | |
2230 | static struct device_attribute *cxlflash_host_attrs[] = { | |
2231 | &dev_attr_port0, | |
2232 | &dev_attr_port1, | |
2233 | &dev_attr_lun_mode, | |
2234 | &dev_attr_ioctl_version, | |
e0f01a21 MO |
2235 | &dev_attr_port0_lun_table, |
2236 | &dev_attr_port1_lun_table, | |
15305514 MO |
2237 | NULL |
2238 | }; | |
2239 | ||
2240 | /* | |
2241 | * Device attributes | |
2242 | */ | |
e0f01a21 | 2243 | static DEVICE_ATTR_RO(mode); |
15305514 MO |
2244 | |
2245 | static struct device_attribute *cxlflash_dev_attrs[] = { | |
2246 | &dev_attr_mode, | |
2247 | NULL | |
2248 | }; | |
2249 | ||
2250 | /* | |
2251 | * Host template | |
2252 | */ | |
2253 | static struct scsi_host_template driver_template = { | |
2254 | .module = THIS_MODULE, | |
2255 | .name = CXLFLASH_ADAPTER_NAME, | |
2256 | .info = cxlflash_driver_info, | |
2257 | .ioctl = cxlflash_ioctl, | |
2258 | .proc_name = CXLFLASH_NAME, | |
2259 | .queuecommand = cxlflash_queuecommand, | |
2260 | .eh_device_reset_handler = cxlflash_eh_device_reset_handler, | |
2261 | .eh_host_reset_handler = cxlflash_eh_host_reset_handler, | |
2262 | .change_queue_depth = cxlflash_change_queue_depth, | |
2263 | .cmd_per_lun = 16, | |
2264 | .can_queue = CXLFLASH_MAX_CMDS, | |
2265 | .this_id = -1, | |
f15fbf8d | 2266 | .sg_tablesize = SG_NONE, /* No scatter gather support */ |
15305514 MO |
2267 | .max_sectors = CXLFLASH_MAX_SECTORS, |
2268 | .use_clustering = ENABLE_CLUSTERING, | |
2269 | .shost_attrs = cxlflash_host_attrs, | |
2270 | .sdev_attrs = cxlflash_dev_attrs, | |
2271 | }; | |
2272 | ||
2273 | /* | |
2274 | * Device dependent values | |
2275 | */ | |
2276 | static struct dev_dependent_vals dev_corsa_vals = { CXLFLASH_MAX_SECTORS }; | |
2277 | ||
2278 | /* | |
2279 | * PCI device binding table | |
2280 | */ | |
2281 | static struct pci_device_id cxlflash_pci_table[] = { | |
2282 | {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CORSA, | |
2283 | PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_corsa_vals}, | |
2284 | {} | |
2285 | }; | |
2286 | ||
2287 | MODULE_DEVICE_TABLE(pci, cxlflash_pci_table); | |
2288 | ||
c21e0bbf MO |
2289 | /** |
2290 | * cxlflash_worker_thread() - work thread handler for the AFU | |
2291 | * @work: Work structure contained within cxlflash associated with host. | |
2292 | * | |
2293 | * Handles the following events: | |
2294 | * - Link reset which cannot be performed on interrupt context due to | |
2295 | * blocking up to a few seconds | |
2296 | * - Read AFU command room | |
ef51074a | 2297 | * - Rescan the host |
c21e0bbf MO |
2298 | */ |
2299 | static void cxlflash_worker_thread(struct work_struct *work) | |
2300 | { | |
5cdac81a MO |
2301 | struct cxlflash_cfg *cfg = container_of(work, struct cxlflash_cfg, |
2302 | work_q); | |
c21e0bbf | 2303 | struct afu *afu = cfg->afu; |
4392ba49 | 2304 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
2305 | int port; |
2306 | ulong lock_flags; | |
2307 | ||
5cdac81a MO |
2308 | /* Avoid MMIO if the device has failed */ |
2309 | ||
2310 | if (cfg->state != STATE_NORMAL) | |
2311 | return; | |
2312 | ||
c21e0bbf MO |
2313 | spin_lock_irqsave(cfg->host->host_lock, lock_flags); |
2314 | ||
2315 | if (cfg->lr_state == LINK_RESET_REQUIRED) { | |
2316 | port = cfg->lr_port; | |
2317 | if (port < 0) | |
4392ba49 MO |
2318 | dev_err(dev, "%s: invalid port index %d\n", |
2319 | __func__, port); | |
c21e0bbf MO |
2320 | else { |
2321 | spin_unlock_irqrestore(cfg->host->host_lock, | |
2322 | lock_flags); | |
2323 | ||
2324 | /* The reset can block... */ | |
2325 | afu_link_reset(afu, port, | |
f15fbf8d | 2326 | &afu->afu_map->global.fc_regs[port][0]); |
c21e0bbf MO |
2327 | spin_lock_irqsave(cfg->host->host_lock, lock_flags); |
2328 | } | |
2329 | ||
2330 | cfg->lr_state = LINK_RESET_COMPLETE; | |
2331 | } | |
2332 | ||
2333 | if (afu->read_room) { | |
2334 | atomic64_set(&afu->room, readq_be(&afu->host_map->cmd_room)); | |
2335 | afu->read_room = false; | |
2336 | } | |
2337 | ||
2338 | spin_unlock_irqrestore(cfg->host->host_lock, lock_flags); | |
ef51074a MO |
2339 | |
2340 | if (atomic_dec_if_positive(&cfg->scan_host_needed) >= 0) | |
2341 | scsi_scan_host(cfg->host); | |
c21e0bbf MO |
2342 | } |
2343 | ||
2344 | /** | |
2345 | * cxlflash_probe() - PCI entry point to add host | |
2346 | * @pdev: PCI device associated with the host. | |
2347 | * @dev_id: PCI device id associated with device. | |
2348 | * | |
1284fb0c | 2349 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
2350 | */ |
2351 | static int cxlflash_probe(struct pci_dev *pdev, | |
2352 | const struct pci_device_id *dev_id) | |
2353 | { | |
2354 | struct Scsi_Host *host; | |
2355 | struct cxlflash_cfg *cfg = NULL; | |
2356 | struct device *phys_dev; | |
2357 | struct dev_dependent_vals *ddv; | |
2358 | int rc = 0; | |
2359 | ||
2360 | dev_dbg(&pdev->dev, "%s: Found CXLFLASH with IRQ: %d\n", | |
2361 | __func__, pdev->irq); | |
2362 | ||
2363 | ddv = (struct dev_dependent_vals *)dev_id->driver_data; | |
2364 | driver_template.max_sectors = ddv->max_sectors; | |
2365 | ||
2366 | host = scsi_host_alloc(&driver_template, sizeof(struct cxlflash_cfg)); | |
2367 | if (!host) { | |
2368 | dev_err(&pdev->dev, "%s: call to scsi_host_alloc failed!\n", | |
2369 | __func__); | |
2370 | rc = -ENOMEM; | |
2371 | goto out; | |
2372 | } | |
2373 | ||
2374 | host->max_id = CXLFLASH_MAX_NUM_TARGETS_PER_BUS; | |
2375 | host->max_lun = CXLFLASH_MAX_NUM_LUNS_PER_TARGET; | |
2376 | host->max_channel = NUM_FC_PORTS - 1; | |
2377 | host->unique_id = host->host_no; | |
2378 | host->max_cmd_len = CXLFLASH_MAX_CDB_LEN; | |
2379 | ||
2380 | cfg = (struct cxlflash_cfg *)host->hostdata; | |
2381 | cfg->host = host; | |
2382 | rc = alloc_mem(cfg); | |
2383 | if (rc) { | |
fa3f2c6e | 2384 | dev_err(&pdev->dev, "%s: call to alloc_mem failed!\n", |
c21e0bbf MO |
2385 | __func__); |
2386 | rc = -ENOMEM; | |
8b5b1e87 | 2387 | scsi_host_put(cfg->host); |
c21e0bbf MO |
2388 | goto out; |
2389 | } | |
2390 | ||
2391 | cfg->init_state = INIT_STATE_NONE; | |
2392 | cfg->dev = pdev; | |
17ead26f | 2393 | cfg->cxl_fops = cxlflash_cxl_fops; |
2cb79266 MO |
2394 | |
2395 | /* | |
2396 | * The promoted LUNs move to the top of the LUN table. The rest stay | |
2397 | * on the bottom half. The bottom half grows from the end | |
2398 | * (index = 255), whereas the top half grows from the beginning | |
2399 | * (index = 0). | |
2400 | */ | |
2401 | cfg->promote_lun_index = 0; | |
2402 | cfg->last_lun_index[0] = CXLFLASH_NUM_VLUNS/2 - 1; | |
2403 | cfg->last_lun_index[1] = CXLFLASH_NUM_VLUNS/2 - 1; | |
2404 | ||
c21e0bbf | 2405 | cfg->dev_id = (struct pci_device_id *)dev_id; |
c21e0bbf MO |
2406 | |
2407 | init_waitqueue_head(&cfg->tmf_waitq); | |
439e85c1 | 2408 | init_waitqueue_head(&cfg->reset_waitq); |
c21e0bbf MO |
2409 | |
2410 | INIT_WORK(&cfg->work_q, cxlflash_worker_thread); | |
2411 | cfg->lr_state = LINK_RESET_INVALID; | |
2412 | cfg->lr_port = -1; | |
0d73122c | 2413 | spin_lock_init(&cfg->tmf_slock); |
65be2c79 MO |
2414 | mutex_init(&cfg->ctx_tbl_list_mutex); |
2415 | mutex_init(&cfg->ctx_recovery_mutex); | |
0a27ae51 | 2416 | init_rwsem(&cfg->ioctl_rwsem); |
65be2c79 MO |
2417 | INIT_LIST_HEAD(&cfg->ctx_err_recovery); |
2418 | INIT_LIST_HEAD(&cfg->lluns); | |
c21e0bbf MO |
2419 | |
2420 | pci_set_drvdata(pdev, cfg); | |
2421 | ||
f15fbf8d MO |
2422 | /* |
2423 | * Use the special service provided to look up the physical | |
c21e0bbf MO |
2424 | * PCI device, since we are called on the probe of the virtual |
2425 | * PCI host bus (vphb) | |
2426 | */ | |
2427 | phys_dev = cxl_get_phys_dev(pdev); | |
2428 | if (!dev_is_pci(phys_dev)) { | |
4392ba49 | 2429 | dev_err(&pdev->dev, "%s: not a pci dev\n", __func__); |
c21e0bbf MO |
2430 | rc = -ENODEV; |
2431 | goto out_remove; | |
2432 | } | |
2433 | cfg->parent_dev = to_pci_dev(phys_dev); | |
2434 | ||
2435 | cfg->cxl_afu = cxl_pci_to_afu(pdev); | |
2436 | ||
2437 | rc = init_pci(cfg); | |
2438 | if (rc) { | |
2439 | dev_err(&pdev->dev, "%s: call to init_pci " | |
2440 | "failed rc=%d!\n", __func__, rc); | |
2441 | goto out_remove; | |
2442 | } | |
2443 | cfg->init_state = INIT_STATE_PCI; | |
2444 | ||
2445 | rc = init_afu(cfg); | |
2446 | if (rc) { | |
2447 | dev_err(&pdev->dev, "%s: call to init_afu " | |
2448 | "failed rc=%d!\n", __func__, rc); | |
2449 | goto out_remove; | |
2450 | } | |
2451 | cfg->init_state = INIT_STATE_AFU; | |
2452 | ||
c21e0bbf MO |
2453 | rc = init_scsi(cfg); |
2454 | if (rc) { | |
2455 | dev_err(&pdev->dev, "%s: call to init_scsi " | |
2456 | "failed rc=%d!\n", __func__, rc); | |
2457 | goto out_remove; | |
2458 | } | |
2459 | cfg->init_state = INIT_STATE_SCSI; | |
2460 | ||
2461 | out: | |
2462 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
2463 | return rc; | |
2464 | ||
2465 | out_remove: | |
2466 | cxlflash_remove(pdev); | |
2467 | goto out; | |
2468 | } | |
2469 | ||
0a27ae51 MO |
2470 | /** |
2471 | * drain_ioctls() - wait until all currently executing ioctls have completed | |
2472 | * @cfg: Internal structure associated with the host. | |
2473 | * | |
2474 | * Obtain write access to read/write semaphore that wraps ioctl | |
2475 | * handling to 'drain' ioctls currently executing. | |
2476 | */ | |
2477 | static void drain_ioctls(struct cxlflash_cfg *cfg) | |
2478 | { | |
2479 | down_write(&cfg->ioctl_rwsem); | |
2480 | up_write(&cfg->ioctl_rwsem); | |
2481 | } | |
2482 | ||
5cdac81a MO |
2483 | /** |
2484 | * cxlflash_pci_error_detected() - called when a PCI error is detected | |
2485 | * @pdev: PCI device struct. | |
2486 | * @state: PCI channel state. | |
2487 | * | |
2488 | * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT | |
2489 | */ | |
2490 | static pci_ers_result_t cxlflash_pci_error_detected(struct pci_dev *pdev, | |
2491 | pci_channel_state_t state) | |
2492 | { | |
65be2c79 | 2493 | int rc = 0; |
5cdac81a MO |
2494 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); |
2495 | struct device *dev = &cfg->dev->dev; | |
2496 | ||
2497 | dev_dbg(dev, "%s: pdev=%p state=%u\n", __func__, pdev, state); | |
2498 | ||
2499 | switch (state) { | |
2500 | case pci_channel_io_frozen: | |
439e85c1 | 2501 | cfg->state = STATE_RESET; |
5cdac81a | 2502 | scsi_block_requests(cfg->host); |
0a27ae51 | 2503 | drain_ioctls(cfg); |
65be2c79 MO |
2504 | rc = cxlflash_mark_contexts_error(cfg); |
2505 | if (unlikely(rc)) | |
2506 | dev_err(dev, "%s: Failed to mark user contexts!(%d)\n", | |
2507 | __func__, rc); | |
5cdac81a MO |
2508 | term_mc(cfg, UNDO_START); |
2509 | stop_afu(cfg); | |
5cdac81a MO |
2510 | return PCI_ERS_RESULT_NEED_RESET; |
2511 | case pci_channel_io_perm_failure: | |
2512 | cfg->state = STATE_FAILTERM; | |
439e85c1 | 2513 | wake_up_all(&cfg->reset_waitq); |
5cdac81a MO |
2514 | scsi_unblock_requests(cfg->host); |
2515 | return PCI_ERS_RESULT_DISCONNECT; | |
2516 | default: | |
2517 | break; | |
2518 | } | |
2519 | return PCI_ERS_RESULT_NEED_RESET; | |
2520 | } | |
2521 | ||
2522 | /** | |
2523 | * cxlflash_pci_slot_reset() - called when PCI slot has been reset | |
2524 | * @pdev: PCI device struct. | |
2525 | * | |
2526 | * This routine is called by the pci error recovery code after the PCI | |
2527 | * slot has been reset, just before we should resume normal operations. | |
2528 | * | |
2529 | * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT | |
2530 | */ | |
2531 | static pci_ers_result_t cxlflash_pci_slot_reset(struct pci_dev *pdev) | |
2532 | { | |
2533 | int rc = 0; | |
2534 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); | |
2535 | struct device *dev = &cfg->dev->dev; | |
2536 | ||
2537 | dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev); | |
2538 | ||
2539 | rc = init_afu(cfg); | |
2540 | if (unlikely(rc)) { | |
2541 | dev_err(dev, "%s: EEH recovery failed! (%d)\n", __func__, rc); | |
2542 | return PCI_ERS_RESULT_DISCONNECT; | |
2543 | } | |
2544 | ||
2545 | return PCI_ERS_RESULT_RECOVERED; | |
2546 | } | |
2547 | ||
2548 | /** | |
2549 | * cxlflash_pci_resume() - called when normal operation can resume | |
2550 | * @pdev: PCI device struct | |
2551 | */ | |
2552 | static void cxlflash_pci_resume(struct pci_dev *pdev) | |
2553 | { | |
2554 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); | |
2555 | struct device *dev = &cfg->dev->dev; | |
2556 | ||
2557 | dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev); | |
2558 | ||
2559 | cfg->state = STATE_NORMAL; | |
439e85c1 | 2560 | wake_up_all(&cfg->reset_waitq); |
5cdac81a MO |
2561 | scsi_unblock_requests(cfg->host); |
2562 | } | |
2563 | ||
2564 | static const struct pci_error_handlers cxlflash_err_handler = { | |
2565 | .error_detected = cxlflash_pci_error_detected, | |
2566 | .slot_reset = cxlflash_pci_slot_reset, | |
2567 | .resume = cxlflash_pci_resume, | |
2568 | }; | |
2569 | ||
c21e0bbf MO |
2570 | /* |
2571 | * PCI device structure | |
2572 | */ | |
2573 | static struct pci_driver cxlflash_driver = { | |
2574 | .name = CXLFLASH_NAME, | |
2575 | .id_table = cxlflash_pci_table, | |
2576 | .probe = cxlflash_probe, | |
2577 | .remove = cxlflash_remove, | |
5cdac81a | 2578 | .err_handler = &cxlflash_err_handler, |
c21e0bbf MO |
2579 | }; |
2580 | ||
2581 | /** | |
2582 | * init_cxlflash() - module entry point | |
2583 | * | |
1284fb0c | 2584 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
2585 | */ |
2586 | static int __init init_cxlflash(void) | |
2587 | { | |
85599218 | 2588 | pr_info("%s: %s\n", __func__, CXLFLASH_ADAPTER_NAME); |
c21e0bbf | 2589 | |
65be2c79 MO |
2590 | cxlflash_list_init(); |
2591 | ||
c21e0bbf MO |
2592 | return pci_register_driver(&cxlflash_driver); |
2593 | } | |
2594 | ||
2595 | /** | |
2596 | * exit_cxlflash() - module exit point | |
2597 | */ | |
2598 | static void __exit exit_cxlflash(void) | |
2599 | { | |
65be2c79 MO |
2600 | cxlflash_term_global_luns(); |
2601 | cxlflash_free_errpage(); | |
2602 | ||
c21e0bbf MO |
2603 | pci_unregister_driver(&cxlflash_driver); |
2604 | } | |
2605 | ||
2606 | module_init(init_cxlflash); | |
2607 | module_exit(exit_cxlflash); |