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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 | ||
a834a36b UK |
37 | static struct class *cxlflash_class; |
38 | static u32 cxlflash_major; | |
39 | static DECLARE_BITMAP(cxlflash_minor, CXLFLASH_MAX_ADAPTERS); | |
40 | ||
c21e0bbf MO |
41 | /** |
42 | * process_cmd_err() - command error handler | |
43 | * @cmd: AFU command that experienced the error. | |
44 | * @scp: SCSI command associated with the AFU command in error. | |
45 | * | |
46 | * Translates error bits from AFU command to SCSI command results. | |
47 | */ | |
48 | static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp) | |
49 | { | |
fb67d44d MO |
50 | struct afu *afu = cmd->parent; |
51 | struct cxlflash_cfg *cfg = afu->parent; | |
52 | struct device *dev = &cfg->dev->dev; | |
c21e0bbf MO |
53 | struct sisl_ioarcb *ioarcb; |
54 | struct sisl_ioasa *ioasa; | |
8396012f | 55 | u32 resid; |
c21e0bbf MO |
56 | |
57 | if (unlikely(!cmd)) | |
58 | return; | |
59 | ||
60 | ioarcb = &(cmd->rcb); | |
61 | ioasa = &(cmd->sa); | |
62 | ||
63 | if (ioasa->rc.flags & SISL_RC_FLAGS_UNDERRUN) { | |
8396012f MO |
64 | resid = ioasa->resid; |
65 | scsi_set_resid(scp, resid); | |
fb67d44d MO |
66 | dev_dbg(dev, "%s: cmd underrun cmd = %p scp = %p, resid = %d\n", |
67 | __func__, cmd, scp, resid); | |
c21e0bbf MO |
68 | } |
69 | ||
70 | if (ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN) { | |
fb67d44d MO |
71 | dev_dbg(dev, "%s: cmd underrun cmd = %p scp = %p\n", |
72 | __func__, cmd, scp); | |
c21e0bbf MO |
73 | scp->result = (DID_ERROR << 16); |
74 | } | |
75 | ||
fb67d44d MO |
76 | dev_dbg(dev, "%s: cmd failed afu_rc=%02x scsi_rc=%02x fc_rc=%02x " |
77 | "afu_extra=%02x scsi_extra=%02x fc_extra=%02x\n", __func__, | |
78 | ioasa->rc.afu_rc, ioasa->rc.scsi_rc, ioasa->rc.fc_rc, | |
79 | ioasa->afu_extra, ioasa->scsi_extra, ioasa->fc_extra); | |
c21e0bbf MO |
80 | |
81 | if (ioasa->rc.scsi_rc) { | |
82 | /* We have a SCSI status */ | |
83 | if (ioasa->rc.flags & SISL_RC_FLAGS_SENSE_VALID) { | |
84 | memcpy(scp->sense_buffer, ioasa->sense_data, | |
85 | SISL_SENSE_DATA_LEN); | |
86 | scp->result = ioasa->rc.scsi_rc; | |
87 | } else | |
88 | scp->result = ioasa->rc.scsi_rc | (DID_ERROR << 16); | |
89 | } | |
90 | ||
91 | /* | |
92 | * We encountered an error. Set scp->result based on nature | |
93 | * of error. | |
94 | */ | |
95 | if (ioasa->rc.fc_rc) { | |
96 | /* We have an FC status */ | |
97 | switch (ioasa->rc.fc_rc) { | |
98 | case SISL_FC_RC_LINKDOWN: | |
99 | scp->result = (DID_REQUEUE << 16); | |
100 | break; | |
101 | case SISL_FC_RC_RESID: | |
102 | /* This indicates an FCP resid underrun */ | |
103 | if (!(ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN)) { | |
104 | /* If the SISL_RC_FLAGS_OVERRUN flag was set, | |
105 | * then we will handle this error else where. | |
106 | * If not then we must handle it here. | |
8396012f | 107 | * This is probably an AFU bug. |
c21e0bbf MO |
108 | */ |
109 | scp->result = (DID_ERROR << 16); | |
110 | } | |
111 | break; | |
112 | case SISL_FC_RC_RESIDERR: | |
113 | /* Resid mismatch between adapter and device */ | |
114 | case SISL_FC_RC_TGTABORT: | |
115 | case SISL_FC_RC_ABORTOK: | |
116 | case SISL_FC_RC_ABORTFAIL: | |
117 | case SISL_FC_RC_NOLOGI: | |
118 | case SISL_FC_RC_ABORTPEND: | |
119 | case SISL_FC_RC_WRABORTPEND: | |
120 | case SISL_FC_RC_NOEXP: | |
121 | case SISL_FC_RC_INUSE: | |
122 | scp->result = (DID_ERROR << 16); | |
123 | break; | |
124 | } | |
125 | } | |
126 | ||
127 | if (ioasa->rc.afu_rc) { | |
128 | /* We have an AFU error */ | |
129 | switch (ioasa->rc.afu_rc) { | |
130 | case SISL_AFU_RC_NO_CHANNELS: | |
8396012f | 131 | scp->result = (DID_NO_CONNECT << 16); |
c21e0bbf MO |
132 | break; |
133 | case SISL_AFU_RC_DATA_DMA_ERR: | |
134 | switch (ioasa->afu_extra) { | |
135 | case SISL_AFU_DMA_ERR_PAGE_IN: | |
136 | /* Retry */ | |
137 | scp->result = (DID_IMM_RETRY << 16); | |
138 | break; | |
139 | case SISL_AFU_DMA_ERR_INVALID_EA: | |
140 | default: | |
141 | scp->result = (DID_ERROR << 16); | |
142 | } | |
143 | break; | |
144 | case SISL_AFU_RC_OUT_OF_DATA_BUFS: | |
145 | /* Retry */ | |
146 | scp->result = (DID_ALLOC_FAILURE << 16); | |
147 | break; | |
148 | default: | |
149 | scp->result = (DID_ERROR << 16); | |
150 | } | |
151 | } | |
152 | } | |
153 | ||
154 | /** | |
155 | * cmd_complete() - command completion handler | |
156 | * @cmd: AFU command that has completed. | |
157 | * | |
8ba1ddb3 MO |
158 | * For SCSI commands this routine prepares and submits commands that have |
159 | * either completed or timed out to the SCSI stack. For internal commands | |
160 | * (TMF or AFU), this routine simply notifies the originator that the | |
161 | * command has completed. | |
c21e0bbf MO |
162 | */ |
163 | static void cmd_complete(struct afu_cmd *cmd) | |
164 | { | |
165 | struct scsi_cmnd *scp; | |
c21e0bbf MO |
166 | ulong lock_flags; |
167 | struct afu *afu = cmd->parent; | |
168 | struct cxlflash_cfg *cfg = afu->parent; | |
fb67d44d | 169 | struct device *dev = &cfg->dev->dev; |
a002bf83 | 170 | struct hwq *hwq = get_hwq(afu, cmd->hwq_index); |
c21e0bbf | 171 | |
a002bf83 UK |
172 | spin_lock_irqsave(&hwq->hsq_slock, lock_flags); |
173 | list_del(&cmd->list); | |
174 | spin_unlock_irqrestore(&hwq->hsq_slock, lock_flags); | |
175 | ||
fe7f9698 MO |
176 | if (cmd->scp) { |
177 | scp = cmd->scp; | |
8396012f | 178 | if (unlikely(cmd->sa.ioasc)) |
c21e0bbf MO |
179 | process_cmd_err(cmd, scp); |
180 | else | |
181 | scp->result = (DID_OK << 16); | |
182 | ||
fb67d44d MO |
183 | dev_dbg_ratelimited(dev, "%s:scp=%p result=%08x ioasc=%08x\n", |
184 | __func__, scp, scp->result, cmd->sa.ioasc); | |
c21e0bbf | 185 | scp->scsi_done(scp); |
8ba1ddb3 MO |
186 | } else if (cmd->cmd_tmf) { |
187 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); | |
188 | cfg->tmf_active = false; | |
189 | wake_up_all_locked(&cfg->tmf_waitq); | |
190 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); | |
c21e0bbf MO |
191 | } else |
192 | complete(&cmd->cevent); | |
193 | } | |
194 | ||
a1ea04b3 UK |
195 | /** |
196 | * flush_pending_cmds() - flush all pending commands on this hardware queue | |
197 | * @hwq: Hardware queue to flush. | |
198 | * | |
199 | * The hardware send queue lock associated with this hardware queue must be | |
200 | * held when calling this routine. | |
201 | */ | |
202 | static void flush_pending_cmds(struct hwq *hwq) | |
203 | { | |
8ba1ddb3 | 204 | struct cxlflash_cfg *cfg = hwq->afu->parent; |
a1ea04b3 UK |
205 | struct afu_cmd *cmd, *tmp; |
206 | struct scsi_cmnd *scp; | |
8ba1ddb3 | 207 | ulong lock_flags; |
a1ea04b3 UK |
208 | |
209 | list_for_each_entry_safe(cmd, tmp, &hwq->pending_cmds, list) { | |
210 | /* Bypass command when on a doneq, cmd_complete() will handle */ | |
211 | if (!list_empty(&cmd->queue)) | |
212 | continue; | |
213 | ||
214 | list_del(&cmd->list); | |
215 | ||
216 | if (cmd->scp) { | |
217 | scp = cmd->scp; | |
218 | scp->result = (DID_IMM_RETRY << 16); | |
219 | scp->scsi_done(scp); | |
220 | } else { | |
221 | cmd->cmd_aborted = true; | |
8ba1ddb3 MO |
222 | |
223 | if (cmd->cmd_tmf) { | |
224 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); | |
225 | cfg->tmf_active = false; | |
226 | wake_up_all_locked(&cfg->tmf_waitq); | |
227 | spin_unlock_irqrestore(&cfg->tmf_slock, | |
228 | lock_flags); | |
229 | } else | |
230 | complete(&cmd->cevent); | |
a1ea04b3 UK |
231 | } |
232 | } | |
233 | } | |
234 | ||
15305514 | 235 | /** |
a96851d3 UK |
236 | * context_reset() - reset context via specified register |
237 | * @hwq: Hardware queue owning the context to be reset. | |
9c7d1ee5 | 238 | * @reset_reg: MMIO register to perform reset. |
a96851d3 | 239 | * |
7c4c41f1 UK |
240 | * When the reset is successful, the SISLite specification guarantees that |
241 | * the AFU has aborted all currently pending I/O. Accordingly, these commands | |
242 | * must be flushed. | |
243 | * | |
a96851d3 | 244 | * Return: 0 on success, -errno on failure |
15305514 | 245 | */ |
a96851d3 | 246 | static int context_reset(struct hwq *hwq, __be64 __iomem *reset_reg) |
15305514 | 247 | { |
a96851d3 | 248 | struct cxlflash_cfg *cfg = hwq->afu->parent; |
3d2f617d | 249 | struct device *dev = &cfg->dev->dev; |
a96851d3 UK |
250 | int rc = -ETIMEDOUT; |
251 | int nretry = 0; | |
252 | u64 val = 0x1; | |
7c4c41f1 | 253 | ulong lock_flags; |
15305514 | 254 | |
a96851d3 | 255 | dev_dbg(dev, "%s: hwq=%p\n", __func__, hwq); |
15305514 | 256 | |
7c4c41f1 UK |
257 | spin_lock_irqsave(&hwq->hsq_slock, lock_flags); |
258 | ||
a96851d3 | 259 | writeq_be(val, reset_reg); |
15305514 | 260 | do { |
a96851d3 UK |
261 | val = readq_be(reset_reg); |
262 | if ((val & 0x1) == 0x0) { | |
263 | rc = 0; | |
15305514 | 264 | break; |
a96851d3 UK |
265 | } |
266 | ||
15305514 | 267 | /* Double delay each time */ |
ea765431 | 268 | udelay(1 << nretry); |
15305514 | 269 | } while (nretry++ < MC_ROOM_RETRY_CNT); |
3d2f617d | 270 | |
7c4c41f1 UK |
271 | if (!rc) |
272 | flush_pending_cmds(hwq); | |
273 | ||
274 | spin_unlock_irqrestore(&hwq->hsq_slock, lock_flags); | |
275 | ||
a96851d3 UK |
276 | dev_dbg(dev, "%s: returning rc=%d, val=%016llx nretry=%d\n", |
277 | __func__, rc, val, nretry); | |
278 | return rc; | |
15305514 MO |
279 | } |
280 | ||
9c7d1ee5 | 281 | /** |
a96851d3 UK |
282 | * context_reset_ioarrin() - reset context via IOARRIN register |
283 | * @hwq: Hardware queue owning the context to be reset. | |
284 | * | |
285 | * Return: 0 on success, -errno on failure | |
9c7d1ee5 | 286 | */ |
a96851d3 | 287 | static int context_reset_ioarrin(struct hwq *hwq) |
9c7d1ee5 | 288 | { |
a96851d3 | 289 | return context_reset(hwq, &hwq->host_map->ioarrin); |
9c7d1ee5 MO |
290 | } |
291 | ||
696d0b0c | 292 | /** |
a96851d3 UK |
293 | * context_reset_sq() - reset context via SQ_CONTEXT_RESET register |
294 | * @hwq: Hardware queue owning the context to be reset. | |
295 | * | |
296 | * Return: 0 on success, -errno on failure | |
696d0b0c | 297 | */ |
a96851d3 | 298 | static int context_reset_sq(struct hwq *hwq) |
696d0b0c | 299 | { |
a96851d3 | 300 | return context_reset(hwq, &hwq->host_map->sq_ctx_reset); |
696d0b0c MO |
301 | } |
302 | ||
15305514 | 303 | /** |
48b4be36 | 304 | * send_cmd_ioarrin() - sends an AFU command via IOARRIN register |
15305514 MO |
305 | * @afu: AFU associated with the host. |
306 | * @cmd: AFU command to send. | |
307 | * | |
308 | * Return: | |
1284fb0c | 309 | * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure |
15305514 | 310 | */ |
48b4be36 | 311 | static int send_cmd_ioarrin(struct afu *afu, struct afu_cmd *cmd) |
15305514 MO |
312 | { |
313 | struct cxlflash_cfg *cfg = afu->parent; | |
314 | struct device *dev = &cfg->dev->dev; | |
bfc0bab1 | 315 | struct hwq *hwq = get_hwq(afu, cmd->hwq_index); |
15305514 | 316 | int rc = 0; |
11f7b184 UK |
317 | s64 room; |
318 | ulong lock_flags; | |
15305514 MO |
319 | |
320 | /* | |
11f7b184 UK |
321 | * To avoid the performance penalty of MMIO, spread the update of |
322 | * 'room' over multiple commands. | |
15305514 | 323 | */ |
66ea9bcc | 324 | spin_lock_irqsave(&hwq->hsq_slock, lock_flags); |
bfc0bab1 UK |
325 | if (--hwq->room < 0) { |
326 | room = readq_be(&hwq->host_map->cmd_room); | |
11f7b184 UK |
327 | if (room <= 0) { |
328 | dev_dbg_ratelimited(dev, "%s: no cmd_room to send " | |
329 | "0x%02X, room=0x%016llX\n", | |
330 | __func__, cmd->rcb.cdb[0], room); | |
bfc0bab1 | 331 | hwq->room = 0; |
11f7b184 UK |
332 | rc = SCSI_MLQUEUE_HOST_BUSY; |
333 | goto out; | |
15305514 | 334 | } |
bfc0bab1 | 335 | hwq->room = room - 1; |
15305514 MO |
336 | } |
337 | ||
a002bf83 | 338 | list_add(&cmd->list, &hwq->pending_cmds); |
bfc0bab1 | 339 | writeq_be((u64)&cmd->rcb, &hwq->host_map->ioarrin); |
15305514 | 340 | out: |
66ea9bcc | 341 | spin_unlock_irqrestore(&hwq->hsq_slock, lock_flags); |
fb67d44d MO |
342 | dev_dbg(dev, "%s: cmd=%p len=%u ea=%016llx rc=%d\n", __func__, |
343 | cmd, cmd->rcb.data_len, cmd->rcb.data_ea, rc); | |
15305514 | 344 | return rc; |
15305514 MO |
345 | } |
346 | ||
696d0b0c MO |
347 | /** |
348 | * send_cmd_sq() - sends an AFU command via SQ ring | |
349 | * @afu: AFU associated with the host. | |
350 | * @cmd: AFU command to send. | |
351 | * | |
352 | * Return: | |
353 | * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure | |
354 | */ | |
355 | static int send_cmd_sq(struct afu *afu, struct afu_cmd *cmd) | |
356 | { | |
357 | struct cxlflash_cfg *cfg = afu->parent; | |
358 | struct device *dev = &cfg->dev->dev; | |
bfc0bab1 | 359 | struct hwq *hwq = get_hwq(afu, cmd->hwq_index); |
696d0b0c MO |
360 | int rc = 0; |
361 | int newval; | |
362 | ulong lock_flags; | |
363 | ||
bfc0bab1 | 364 | newval = atomic_dec_if_positive(&hwq->hsq_credits); |
696d0b0c MO |
365 | if (newval <= 0) { |
366 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
367 | goto out; | |
368 | } | |
369 | ||
370 | cmd->rcb.ioasa = &cmd->sa; | |
371 | ||
bfc0bab1 | 372 | spin_lock_irqsave(&hwq->hsq_slock, lock_flags); |
696d0b0c | 373 | |
bfc0bab1 UK |
374 | *hwq->hsq_curr = cmd->rcb; |
375 | if (hwq->hsq_curr < hwq->hsq_end) | |
376 | hwq->hsq_curr++; | |
696d0b0c | 377 | else |
bfc0bab1 | 378 | hwq->hsq_curr = hwq->hsq_start; |
a002bf83 UK |
379 | |
380 | list_add(&cmd->list, &hwq->pending_cmds); | |
bfc0bab1 | 381 | writeq_be((u64)hwq->hsq_curr, &hwq->host_map->sq_tail); |
696d0b0c | 382 | |
bfc0bab1 | 383 | spin_unlock_irqrestore(&hwq->hsq_slock, lock_flags); |
696d0b0c | 384 | out: |
fb67d44d MO |
385 | dev_dbg(dev, "%s: cmd=%p len=%u ea=%016llx ioasa=%p rc=%d curr=%p " |
386 | "head=%016llx tail=%016llx\n", __func__, cmd, cmd->rcb.data_len, | |
bfc0bab1 UK |
387 | cmd->rcb.data_ea, cmd->rcb.ioasa, rc, hwq->hsq_curr, |
388 | readq_be(&hwq->host_map->sq_head), | |
389 | readq_be(&hwq->host_map->sq_tail)); | |
696d0b0c MO |
390 | return rc; |
391 | } | |
392 | ||
15305514 MO |
393 | /** |
394 | * wait_resp() - polls for a response or timeout to a sent AFU command | |
395 | * @afu: AFU associated with the host. | |
396 | * @cmd: AFU command that was sent. | |
9ba848ac | 397 | * |
a96851d3 | 398 | * Return: 0 on success, -errno on failure |
15305514 | 399 | */ |
9ba848ac | 400 | static int wait_resp(struct afu *afu, struct afu_cmd *cmd) |
15305514 | 401 | { |
fb67d44d MO |
402 | struct cxlflash_cfg *cfg = afu->parent; |
403 | struct device *dev = &cfg->dev->dev; | |
9ba848ac | 404 | int rc = 0; |
15305514 MO |
405 | ulong timeout = msecs_to_jiffies(cmd->rcb.timeout * 2 * 1000); |
406 | ||
407 | timeout = wait_for_completion_timeout(&cmd->cevent, timeout); | |
a96851d3 UK |
408 | if (!timeout) |
409 | rc = -ETIMEDOUT; | |
15305514 | 410 | |
a1ea04b3 UK |
411 | if (cmd->cmd_aborted) |
412 | rc = -EAGAIN; | |
413 | ||
9ba848ac | 414 | if (unlikely(cmd->sa.ioasc != 0)) { |
fb67d44d MO |
415 | dev_err(dev, "%s: cmd %02x failed, ioasc=%08x\n", |
416 | __func__, cmd->rcb.cdb[0], cmd->sa.ioasc); | |
a96851d3 | 417 | rc = -EIO; |
9ba848ac MO |
418 | } |
419 | ||
420 | return rc; | |
15305514 MO |
421 | } |
422 | ||
1dd0c0e4 MO |
423 | /** |
424 | * cmd_to_target_hwq() - selects a target hardware queue for a SCSI command | |
425 | * @host: SCSI host associated with device. | |
426 | * @scp: SCSI command to send. | |
427 | * @afu: SCSI command to send. | |
428 | * | |
429 | * Hashes a command based upon the hardware queue mode. | |
430 | * | |
431 | * Return: Trusted index of target hardware queue | |
432 | */ | |
433 | static u32 cmd_to_target_hwq(struct Scsi_Host *host, struct scsi_cmnd *scp, | |
434 | struct afu *afu) | |
435 | { | |
436 | u32 tag; | |
437 | u32 hwq = 0; | |
438 | ||
439 | if (afu->num_hwqs == 1) | |
440 | return 0; | |
441 | ||
442 | switch (afu->hwq_mode) { | |
443 | case HWQ_MODE_RR: | |
444 | hwq = afu->hwq_rr_count++ % afu->num_hwqs; | |
445 | break; | |
446 | case HWQ_MODE_TAG: | |
447 | tag = blk_mq_unique_tag(scp->request); | |
448 | hwq = blk_mq_unique_tag_to_hwq(tag); | |
449 | break; | |
450 | case HWQ_MODE_CPU: | |
451 | hwq = smp_processor_id() % afu->num_hwqs; | |
452 | break; | |
453 | default: | |
454 | WARN_ON_ONCE(1); | |
455 | } | |
456 | ||
457 | return hwq; | |
458 | } | |
459 | ||
c21e0bbf MO |
460 | /** |
461 | * send_tmf() - sends a Task Management Function (TMF) | |
32abbeda MO |
462 | * @cfg: Internal structure associated with the host. |
463 | * @sdev: SCSI device destined for TMF. | |
c21e0bbf MO |
464 | * @tmfcmd: TMF command to send. |
465 | * | |
466 | * Return: | |
8ba1ddb3 | 467 | * 0 on success, SCSI_MLQUEUE_HOST_BUSY or -errno on failure |
c21e0bbf | 468 | */ |
32abbeda MO |
469 | static int send_tmf(struct cxlflash_cfg *cfg, struct scsi_device *sdev, |
470 | u64 tmfcmd) | |
c21e0bbf | 471 | { |
32abbeda | 472 | struct afu *afu = cfg->afu; |
8ba1ddb3 | 473 | struct afu_cmd *cmd = NULL; |
4392ba49 | 474 | struct device *dev = &cfg->dev->dev; |
32abbeda | 475 | struct hwq *hwq = get_hwq(afu, PRIMARY_HWQ); |
8ba1ddb3 | 476 | char *buf = NULL; |
c21e0bbf MO |
477 | ulong lock_flags; |
478 | int rc = 0; | |
018d1dc9 | 479 | ulong to; |
c21e0bbf | 480 | |
8ba1ddb3 MO |
481 | buf = kzalloc(sizeof(*cmd) + __alignof__(*cmd) - 1, GFP_KERNEL); |
482 | if (unlikely(!buf)) { | |
483 | dev_err(dev, "%s: no memory for command\n", __func__); | |
484 | rc = -ENOMEM; | |
485 | goto out; | |
486 | } | |
487 | ||
488 | cmd = (struct afu_cmd *)PTR_ALIGN(buf, __alignof__(*cmd)); | |
489 | INIT_LIST_HEAD(&cmd->queue); | |
490 | ||
018d1dc9 MO |
491 | /* When Task Management Function is active do not send another */ |
492 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); | |
c21e0bbf | 493 | if (cfg->tmf_active) |
018d1dc9 MO |
494 | wait_event_interruptible_lock_irq(cfg->tmf_waitq, |
495 | !cfg->tmf_active, | |
496 | cfg->tmf_slock); | |
c21e0bbf | 497 | cfg->tmf_active = true; |
018d1dc9 | 498 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 499 | |
d4ace351 MO |
500 | cmd->parent = afu; |
501 | cmd->cmd_tmf = true; | |
32abbeda | 502 | cmd->hwq_index = hwq->index; |
d4ace351 | 503 | |
bfc0bab1 | 504 | cmd->rcb.ctx_id = hwq->ctx_hndl; |
5fbb96c8 | 505 | cmd->rcb.msi = SISL_MSI_RRQ_UPDATED; |
32abbeda MO |
506 | cmd->rcb.port_sel = CHAN2PORTMASK(sdev->channel); |
507 | cmd->rcb.lun_id = lun_to_lunid(sdev->lun); | |
c21e0bbf | 508 | cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID | |
d4ace351 MO |
509 | SISL_REQ_FLAGS_SUP_UNDERRUN | |
510 | SISL_REQ_FLAGS_TMF_CMD); | |
c21e0bbf MO |
511 | memcpy(cmd->rcb.cdb, &tmfcmd, sizeof(tmfcmd)); |
512 | ||
48b4be36 | 513 | rc = afu->send_cmd(afu, cmd); |
c21e0bbf | 514 | if (unlikely(rc)) { |
018d1dc9 | 515 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 516 | cfg->tmf_active = false; |
018d1dc9 | 517 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
518 | goto out; |
519 | } | |
520 | ||
018d1dc9 MO |
521 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
522 | to = msecs_to_jiffies(5000); | |
523 | to = wait_event_interruptible_lock_irq_timeout(cfg->tmf_waitq, | |
524 | !cfg->tmf_active, | |
525 | cfg->tmf_slock, | |
526 | to); | |
527 | if (!to) { | |
fb67d44d | 528 | dev_err(dev, "%s: TMF timed out\n", __func__); |
8ba1ddb3 MO |
529 | rc = -ETIMEDOUT; |
530 | } else if (cmd->cmd_aborted) { | |
531 | dev_err(dev, "%s: TMF aborted\n", __func__); | |
532 | rc = -EAGAIN; | |
533 | } else if (cmd->sa.ioasc) { | |
534 | dev_err(dev, "%s: TMF failed ioasc=%08x\n", | |
535 | __func__, cmd->sa.ioasc); | |
536 | rc = -EIO; | |
018d1dc9 | 537 | } |
8ba1ddb3 | 538 | cfg->tmf_active = false; |
018d1dc9 | 539 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 540 | out: |
8ba1ddb3 | 541 | kfree(buf); |
c21e0bbf MO |
542 | return rc; |
543 | } | |
544 | ||
545 | /** | |
546 | * cxlflash_driver_info() - information handler for this host driver | |
547 | * @host: SCSI host associated with device. | |
548 | * | |
549 | * Return: A string describing the device. | |
550 | */ | |
551 | static const char *cxlflash_driver_info(struct Scsi_Host *host) | |
552 | { | |
553 | return CXLFLASH_ADAPTER_NAME; | |
554 | } | |
555 | ||
556 | /** | |
557 | * cxlflash_queuecommand() - sends a mid-layer request | |
558 | * @host: SCSI host associated with device. | |
559 | * @scp: SCSI command to send. | |
560 | * | |
1284fb0c | 561 | * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure |
c21e0bbf MO |
562 | */ |
563 | static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp) | |
564 | { | |
fb67d44d | 565 | struct cxlflash_cfg *cfg = shost_priv(host); |
c21e0bbf | 566 | struct afu *afu = cfg->afu; |
4392ba49 | 567 | struct device *dev = &cfg->dev->dev; |
479ad8e9 | 568 | struct afu_cmd *cmd = sc_to_afuci(scp); |
9d89326c | 569 | struct scatterlist *sg = scsi_sglist(scp); |
1dd0c0e4 MO |
570 | int hwq_index = cmd_to_target_hwq(host, scp, afu); |
571 | struct hwq *hwq = get_hwq(afu, hwq_index); | |
9d89326c | 572 | u16 req_flags = SISL_REQ_FLAGS_SUP_UNDERRUN; |
c21e0bbf | 573 | ulong lock_flags; |
c21e0bbf MO |
574 | int rc = 0; |
575 | ||
4392ba49 | 576 | dev_dbg_ratelimited(dev, "%s: (scp=%p) %d/%d/%d/%llu " |
fb67d44d | 577 | "cdb=(%08x-%08x-%08x-%08x)\n", |
4392ba49 MO |
578 | __func__, scp, host->host_no, scp->device->channel, |
579 | scp->device->id, scp->device->lun, | |
580 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
581 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
582 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
583 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
c21e0bbf | 584 | |
018d1dc9 MO |
585 | /* |
586 | * If a Task Management Function is active, wait for it to complete | |
c21e0bbf MO |
587 | * before continuing with regular commands. |
588 | */ | |
018d1dc9 | 589 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 590 | if (cfg->tmf_active) { |
018d1dc9 | 591 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
592 | rc = SCSI_MLQUEUE_HOST_BUSY; |
593 | goto out; | |
594 | } | |
018d1dc9 | 595 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 596 | |
5cdac81a | 597 | switch (cfg->state) { |
323e3342 MO |
598 | case STATE_PROBING: |
599 | case STATE_PROBED: | |
439e85c1 | 600 | case STATE_RESET: |
fb67d44d | 601 | dev_dbg_ratelimited(dev, "%s: device is in reset\n", __func__); |
5cdac81a MO |
602 | rc = SCSI_MLQUEUE_HOST_BUSY; |
603 | goto out; | |
604 | case STATE_FAILTERM: | |
fb67d44d | 605 | dev_dbg_ratelimited(dev, "%s: device has failed\n", __func__); |
5cdac81a MO |
606 | scp->result = (DID_NO_CONNECT << 16); |
607 | scp->scsi_done(scp); | |
608 | rc = 0; | |
609 | goto out; | |
610 | default: | |
611 | break; | |
612 | } | |
613 | ||
9d89326c | 614 | if (likely(sg)) { |
50b787f7 MO |
615 | cmd->rcb.data_len = sg->length; |
616 | cmd->rcb.data_ea = (uintptr_t)sg_virt(sg); | |
9d89326c | 617 | } |
c21e0bbf | 618 | |
fe7f9698 | 619 | cmd->scp = scp; |
5fbb96c8 | 620 | cmd->parent = afu; |
1dd0c0e4 | 621 | cmd->hwq_index = hwq_index; |
c21e0bbf | 622 | |
ac713cf4 | 623 | cmd->sa.ioasc = 0; |
bfc0bab1 | 624 | cmd->rcb.ctx_id = hwq->ctx_hndl; |
9d89326c | 625 | cmd->rcb.msi = SISL_MSI_RRQ_UPDATED; |
8fa4f177 | 626 | cmd->rcb.port_sel = CHAN2PORTMASK(scp->device->channel); |
9d89326c | 627 | cmd->rcb.lun_id = lun_to_lunid(scp->device->lun); |
c21e0bbf | 628 | |
9d89326c MO |
629 | if (scp->sc_data_direction == DMA_TO_DEVICE) |
630 | req_flags |= SISL_REQ_FLAGS_HOST_WRITE; | |
c21e0bbf | 631 | |
9d89326c | 632 | cmd->rcb.req_flags = req_flags; |
c21e0bbf MO |
633 | memcpy(cmd->rcb.cdb, scp->cmnd, sizeof(cmd->rcb.cdb)); |
634 | ||
48b4be36 | 635 | rc = afu->send_cmd(afu, cmd); |
c21e0bbf MO |
636 | out: |
637 | return rc; | |
638 | } | |
639 | ||
640 | /** | |
15305514 | 641 | * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe |
1284fb0c | 642 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 643 | */ |
15305514 | 644 | static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg *cfg) |
c21e0bbf | 645 | { |
15305514 | 646 | struct pci_dev *pdev = cfg->dev; |
c21e0bbf | 647 | |
15305514 MO |
648 | if (pci_channel_offline(pdev)) |
649 | wait_event_timeout(cfg->reset_waitq, | |
650 | !pci_channel_offline(pdev), | |
651 | CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT); | |
c21e0bbf MO |
652 | } |
653 | ||
654 | /** | |
15305514 | 655 | * free_mem() - free memory associated with the AFU |
1284fb0c | 656 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 657 | */ |
15305514 | 658 | static void free_mem(struct cxlflash_cfg *cfg) |
c21e0bbf | 659 | { |
15305514 | 660 | struct afu *afu = cfg->afu; |
c21e0bbf | 661 | |
15305514 | 662 | if (cfg->afu) { |
15305514 MO |
663 | free_pages((ulong)afu, get_order(sizeof(struct afu))); |
664 | cfg->afu = NULL; | |
5cdac81a | 665 | } |
c21e0bbf MO |
666 | } |
667 | ||
0b09e711 UK |
668 | /** |
669 | * cxlflash_reset_sync() - synchronizing point for asynchronous resets | |
670 | * @cfg: Internal structure associated with the host. | |
671 | */ | |
672 | static void cxlflash_reset_sync(struct cxlflash_cfg *cfg) | |
673 | { | |
674 | if (cfg->async_reset_cookie == 0) | |
675 | return; | |
676 | ||
677 | /* Wait until all async calls prior to this cookie have completed */ | |
678 | async_synchronize_cookie(cfg->async_reset_cookie + 1); | |
679 | cfg->async_reset_cookie = 0; | |
680 | } | |
681 | ||
c21e0bbf | 682 | /** |
15305514 | 683 | * stop_afu() - stops the AFU command timers and unmaps the MMIO space |
1284fb0c | 684 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 685 | * |
15305514 | 686 | * Safe to call with AFU in a partially allocated/initialized state. |
ee91e332 | 687 | * |
0df5bef7 | 688 | * Cancels scheduled worker threads, waits for any active internal AFU |
cba06e6d | 689 | * commands to timeout, disables IRQ polling and then unmaps the MMIO space. |
c21e0bbf | 690 | */ |
15305514 | 691 | static void stop_afu(struct cxlflash_cfg *cfg) |
c21e0bbf | 692 | { |
15305514 | 693 | struct afu *afu = cfg->afu; |
bfc0bab1 UK |
694 | struct hwq *hwq; |
695 | int i; | |
c21e0bbf | 696 | |
0df5bef7 | 697 | cancel_work_sync(&cfg->work_q); |
0b09e711 UK |
698 | if (!current_is_async()) |
699 | cxlflash_reset_sync(cfg); | |
0df5bef7 | 700 | |
15305514 | 701 | if (likely(afu)) { |
de01283b MO |
702 | while (atomic_read(&afu->cmds_active)) |
703 | ssleep(1); | |
bfc0bab1 UK |
704 | |
705 | if (afu_is_irqpoll_enabled(afu)) { | |
3065267a | 706 | for (i = 0; i < afu->num_hwqs; i++) { |
bfc0bab1 UK |
707 | hwq = get_hwq(afu, i); |
708 | ||
709 | irq_poll_disable(&hwq->irqpoll); | |
710 | } | |
711 | } | |
712 | ||
c21e0bbf | 713 | if (likely(afu->afu_map)) { |
29b4894f | 714 | cfg->ops->psa_unmap(afu->afu_map); |
c21e0bbf MO |
715 | afu->afu_map = NULL; |
716 | } | |
717 | } | |
718 | } | |
719 | ||
720 | /** | |
9526f360 | 721 | * term_intr() - disables all AFU interrupts |
1284fb0c | 722 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 723 | * @level: Depth of allocation, where to begin waterfall tear down. |
bfc0bab1 | 724 | * @index: Index of the hardware queue. |
c21e0bbf MO |
725 | * |
726 | * Safe to call with AFU/MC in partially allocated/initialized state. | |
727 | */ | |
bfc0bab1 UK |
728 | static void term_intr(struct cxlflash_cfg *cfg, enum undo_level level, |
729 | u32 index) | |
c21e0bbf | 730 | { |
c21e0bbf | 731 | struct afu *afu = cfg->afu; |
4392ba49 | 732 | struct device *dev = &cfg->dev->dev; |
bfc0bab1 | 733 | struct hwq *hwq; |
c21e0bbf | 734 | |
bfc0bab1 UK |
735 | if (!afu) { |
736 | dev_err(dev, "%s: returning with NULL afu\n", __func__); | |
737 | return; | |
738 | } | |
739 | ||
740 | hwq = get_hwq(afu, index); | |
741 | ||
ee9f9eea | 742 | if (!hwq->ctx_cookie) { |
bfc0bab1 | 743 | dev_err(dev, "%s: returning with NULL MC\n", __func__); |
c21e0bbf MO |
744 | return; |
745 | } | |
746 | ||
747 | switch (level) { | |
c21e0bbf | 748 | case UNMAP_THREE: |
bfc0bab1 UK |
749 | /* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */ |
750 | if (index == PRIMARY_HWQ) | |
29b4894f | 751 | cfg->ops->unmap_afu_irq(hwq->ctx_cookie, 3, hwq); |
c21e0bbf | 752 | case UNMAP_TWO: |
29b4894f | 753 | cfg->ops->unmap_afu_irq(hwq->ctx_cookie, 2, hwq); |
c21e0bbf | 754 | case UNMAP_ONE: |
29b4894f | 755 | cfg->ops->unmap_afu_irq(hwq->ctx_cookie, 1, hwq); |
c21e0bbf | 756 | case FREE_IRQ: |
29b4894f | 757 | cfg->ops->free_afu_irqs(hwq->ctx_cookie); |
9526f360 MK |
758 | /* fall through */ |
759 | case UNDO_NOOP: | |
760 | /* No action required */ | |
761 | break; | |
762 | } | |
763 | } | |
764 | ||
765 | /** | |
766 | * term_mc() - terminates the master context | |
767 | * @cfg: Internal structure associated with the host. | |
bfc0bab1 | 768 | * @index: Index of the hardware queue. |
9526f360 MK |
769 | * |
770 | * Safe to call with AFU/MC in partially allocated/initialized state. | |
771 | */ | |
bfc0bab1 | 772 | static void term_mc(struct cxlflash_cfg *cfg, u32 index) |
9526f360 | 773 | { |
9526f360 MK |
774 | struct afu *afu = cfg->afu; |
775 | struct device *dev = &cfg->dev->dev; | |
bfc0bab1 | 776 | struct hwq *hwq; |
a1ea04b3 | 777 | ulong lock_flags; |
9526f360 | 778 | |
bfc0bab1 UK |
779 | if (!afu) { |
780 | dev_err(dev, "%s: returning with NULL afu\n", __func__); | |
9526f360 | 781 | return; |
c21e0bbf | 782 | } |
9526f360 | 783 | |
bfc0bab1 UK |
784 | hwq = get_hwq(afu, index); |
785 | ||
ee9f9eea | 786 | if (!hwq->ctx_cookie) { |
bfc0bab1 UK |
787 | dev_err(dev, "%s: returning with NULL MC\n", __func__); |
788 | return; | |
789 | } | |
790 | ||
29b4894f | 791 | WARN_ON(cfg->ops->stop_context(hwq->ctx_cookie)); |
bfc0bab1 | 792 | if (index != PRIMARY_HWQ) |
29b4894f | 793 | WARN_ON(cfg->ops->release_context(hwq->ctx_cookie)); |
ee9f9eea | 794 | hwq->ctx_cookie = NULL; |
a1ea04b3 UK |
795 | |
796 | spin_lock_irqsave(&hwq->hsq_slock, lock_flags); | |
797 | flush_pending_cmds(hwq); | |
798 | spin_unlock_irqrestore(&hwq->hsq_slock, lock_flags); | |
c21e0bbf MO |
799 | } |
800 | ||
801 | /** | |
802 | * term_afu() - terminates the AFU | |
1284fb0c | 803 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
804 | * |
805 | * Safe to call with AFU/MC in partially allocated/initialized state. | |
806 | */ | |
807 | static void term_afu(struct cxlflash_cfg *cfg) | |
808 | { | |
fb67d44d | 809 | struct device *dev = &cfg->dev->dev; |
bfc0bab1 | 810 | int k; |
fb67d44d | 811 | |
9526f360 MK |
812 | /* |
813 | * Tear down is carefully orchestrated to ensure | |
814 | * no interrupts can come in when the problem state | |
815 | * area is unmapped. | |
816 | * | |
bfc0bab1 | 817 | * 1) Disable all AFU interrupts for each master |
9526f360 | 818 | * 2) Unmap the problem state area |
bfc0bab1 | 819 | * 3) Stop each master context |
9526f360 | 820 | */ |
3065267a | 821 | for (k = cfg->afu->num_hwqs - 1; k >= 0; k--) |
bfc0bab1 UK |
822 | term_intr(cfg, UNMAP_THREE, k); |
823 | ||
48a17ad5 | 824 | stop_afu(cfg); |
c21e0bbf | 825 | |
3065267a | 826 | for (k = cfg->afu->num_hwqs - 1; k >= 0; k--) |
bfc0bab1 | 827 | term_mc(cfg, k); |
6ded8b3c | 828 | |
fb67d44d | 829 | dev_dbg(dev, "%s: returning\n", __func__); |
c21e0bbf MO |
830 | } |
831 | ||
704c4b0d UK |
832 | /** |
833 | * notify_shutdown() - notifies device of pending shutdown | |
834 | * @cfg: Internal structure associated with the host. | |
835 | * @wait: Whether to wait for shutdown processing to complete. | |
836 | * | |
837 | * This function will notify the AFU that the adapter is being shutdown | |
838 | * and will wait for shutdown processing to complete if wait is true. | |
839 | * This notification should flush pending I/Os to the device and halt | |
840 | * further I/Os until the next AFU reset is issued and device restarted. | |
841 | */ | |
842 | static void notify_shutdown(struct cxlflash_cfg *cfg, bool wait) | |
843 | { | |
844 | struct afu *afu = cfg->afu; | |
845 | struct device *dev = &cfg->dev->dev; | |
704c4b0d | 846 | struct dev_dependent_vals *ddv; |
0aa14887 | 847 | __be64 __iomem *fc_port_regs; |
704c4b0d UK |
848 | u64 reg, status; |
849 | int i, retry_cnt = 0; | |
850 | ||
851 | ddv = (struct dev_dependent_vals *)cfg->dev_id->driver_data; | |
852 | if (!(ddv->flags & CXLFLASH_NOTIFY_SHUTDOWN)) | |
853 | return; | |
854 | ||
1bd2b282 | 855 | if (!afu || !afu->afu_map) { |
fb67d44d | 856 | dev_dbg(dev, "%s: Problem state area not mapped\n", __func__); |
1bd2b282 UK |
857 | return; |
858 | } | |
859 | ||
704c4b0d | 860 | /* Notify AFU */ |
78ae028e | 861 | for (i = 0; i < cfg->num_fc_ports; i++) { |
0aa14887 MO |
862 | fc_port_regs = get_fc_port_regs(cfg, i); |
863 | ||
864 | reg = readq_be(&fc_port_regs[FC_CONFIG2 / 8]); | |
704c4b0d | 865 | reg |= SISL_FC_SHUTDOWN_NORMAL; |
0aa14887 | 866 | writeq_be(reg, &fc_port_regs[FC_CONFIG2 / 8]); |
704c4b0d UK |
867 | } |
868 | ||
869 | if (!wait) | |
870 | return; | |
871 | ||
872 | /* Wait up to 1.5 seconds for shutdown processing to complete */ | |
78ae028e | 873 | for (i = 0; i < cfg->num_fc_ports; i++) { |
0aa14887 | 874 | fc_port_regs = get_fc_port_regs(cfg, i); |
704c4b0d | 875 | retry_cnt = 0; |
0aa14887 | 876 | |
704c4b0d | 877 | while (true) { |
0aa14887 | 878 | status = readq_be(&fc_port_regs[FC_STATUS / 8]); |
704c4b0d UK |
879 | if (status & SISL_STATUS_SHUTDOWN_COMPLETE) |
880 | break; | |
881 | if (++retry_cnt >= MC_RETRY_CNT) { | |
882 | dev_dbg(dev, "%s: port %d shutdown processing " | |
883 | "not yet completed\n", __func__, i); | |
884 | break; | |
885 | } | |
886 | msleep(100 * retry_cnt); | |
887 | } | |
888 | } | |
889 | } | |
890 | ||
a834a36b UK |
891 | /** |
892 | * cxlflash_get_minor() - gets the first available minor number | |
893 | * | |
894 | * Return: Unique minor number that can be used to create the character device. | |
895 | */ | |
896 | static int cxlflash_get_minor(void) | |
897 | { | |
898 | int minor; | |
899 | long bit; | |
900 | ||
901 | bit = find_first_zero_bit(cxlflash_minor, CXLFLASH_MAX_ADAPTERS); | |
902 | if (bit >= CXLFLASH_MAX_ADAPTERS) | |
903 | return -1; | |
904 | ||
905 | minor = bit & MINORMASK; | |
906 | set_bit(minor, cxlflash_minor); | |
907 | return minor; | |
908 | } | |
909 | ||
910 | /** | |
911 | * cxlflash_put_minor() - releases the minor number | |
912 | * @minor: Minor number that is no longer needed. | |
913 | */ | |
914 | static void cxlflash_put_minor(int minor) | |
915 | { | |
916 | clear_bit(minor, cxlflash_minor); | |
917 | } | |
918 | ||
919 | /** | |
920 | * cxlflash_release_chrdev() - release the character device for the host | |
921 | * @cfg: Internal structure associated with the host. | |
922 | */ | |
923 | static void cxlflash_release_chrdev(struct cxlflash_cfg *cfg) | |
924 | { | |
a834a36b UK |
925 | device_unregister(cfg->chardev); |
926 | cfg->chardev = NULL; | |
927 | cdev_del(&cfg->cdev); | |
928 | cxlflash_put_minor(MINOR(cfg->cdev.dev)); | |
929 | } | |
930 | ||
c21e0bbf MO |
931 | /** |
932 | * cxlflash_remove() - PCI entry point to tear down host | |
933 | * @pdev: PCI device associated with the host. | |
934 | * | |
323e3342 MO |
935 | * Safe to use as a cleanup in partially allocated/initialized state. Note that |
936 | * the reset_waitq is flushed as part of the stop/termination of user contexts. | |
c21e0bbf MO |
937 | */ |
938 | static void cxlflash_remove(struct pci_dev *pdev) | |
939 | { | |
940 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); | |
fb67d44d | 941 | struct device *dev = &pdev->dev; |
c21e0bbf MO |
942 | ulong lock_flags; |
943 | ||
babf985d | 944 | if (!pci_is_enabled(pdev)) { |
fb67d44d | 945 | dev_dbg(dev, "%s: Device is disabled\n", __func__); |
babf985d UK |
946 | return; |
947 | } | |
948 | ||
c21e0bbf MO |
949 | /* If a Task Management Function is active, wait for it to complete |
950 | * before continuing with remove. | |
951 | */ | |
018d1dc9 | 952 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 953 | if (cfg->tmf_active) |
018d1dc9 MO |
954 | wait_event_interruptible_lock_irq(cfg->tmf_waitq, |
955 | !cfg->tmf_active, | |
956 | cfg->tmf_slock); | |
957 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); | |
c21e0bbf | 958 | |
704c4b0d UK |
959 | /* Notify AFU and wait for shutdown processing to complete */ |
960 | notify_shutdown(cfg, true); | |
961 | ||
5cdac81a | 962 | cfg->state = STATE_FAILTERM; |
65be2c79 | 963 | cxlflash_stop_term_user_contexts(cfg); |
5cdac81a | 964 | |
c21e0bbf | 965 | switch (cfg->init_state) { |
a834a36b UK |
966 | case INIT_STATE_CDEV: |
967 | cxlflash_release_chrdev(cfg); | |
c21e0bbf | 968 | case INIT_STATE_SCSI: |
65be2c79 | 969 | cxlflash_term_local_luns(cfg); |
c21e0bbf | 970 | scsi_remove_host(cfg->host); |
c21e0bbf | 971 | case INIT_STATE_AFU: |
b45cdbaf | 972 | term_afu(cfg); |
c21e0bbf | 973 | case INIT_STATE_PCI: |
c21e0bbf MO |
974 | pci_disable_device(pdev); |
975 | case INIT_STATE_NONE: | |
c21e0bbf | 976 | free_mem(cfg); |
8b5b1e87 | 977 | scsi_host_put(cfg->host); |
c21e0bbf MO |
978 | break; |
979 | } | |
980 | ||
fb67d44d | 981 | dev_dbg(dev, "%s: returning\n", __func__); |
c21e0bbf MO |
982 | } |
983 | ||
984 | /** | |
985 | * alloc_mem() - allocates the AFU and its command pool | |
1284fb0c | 986 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
987 | * |
988 | * A partially allocated state remains on failure. | |
989 | * | |
990 | * Return: | |
991 | * 0 on success | |
992 | * -ENOMEM on failure to allocate memory | |
993 | */ | |
994 | static int alloc_mem(struct cxlflash_cfg *cfg) | |
995 | { | |
996 | int rc = 0; | |
4392ba49 | 997 | struct device *dev = &cfg->dev->dev; |
c21e0bbf | 998 | |
696d0b0c | 999 | /* AFU is ~28k, i.e. only one 64k page or up to seven 4k pages */ |
c21e0bbf MO |
1000 | cfg->afu = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, |
1001 | get_order(sizeof(struct afu))); | |
1002 | if (unlikely(!cfg->afu)) { | |
4392ba49 MO |
1003 | dev_err(dev, "%s: cannot get %d free pages\n", |
1004 | __func__, get_order(sizeof(struct afu))); | |
c21e0bbf MO |
1005 | rc = -ENOMEM; |
1006 | goto out; | |
1007 | } | |
1008 | cfg->afu->parent = cfg; | |
3065267a | 1009 | cfg->afu->desired_hwqs = CXLFLASH_DEF_HWQS; |
c21e0bbf | 1010 | cfg->afu->afu_map = NULL; |
c21e0bbf MO |
1011 | out: |
1012 | return rc; | |
1013 | } | |
1014 | ||
1015 | /** | |
1016 | * init_pci() - initializes the host as a PCI device | |
1284fb0c | 1017 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 1018 | * |
1284fb0c | 1019 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
1020 | */ |
1021 | static int init_pci(struct cxlflash_cfg *cfg) | |
1022 | { | |
1023 | struct pci_dev *pdev = cfg->dev; | |
fb67d44d | 1024 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
1025 | int rc = 0; |
1026 | ||
c21e0bbf MO |
1027 | rc = pci_enable_device(pdev); |
1028 | if (rc || pci_channel_offline(pdev)) { | |
1029 | if (pci_channel_offline(pdev)) { | |
1030 | cxlflash_wait_for_pci_err_recovery(cfg); | |
1031 | rc = pci_enable_device(pdev); | |
1032 | } | |
1033 | ||
1034 | if (rc) { | |
fb67d44d | 1035 | dev_err(dev, "%s: Cannot enable adapter\n", __func__); |
c21e0bbf | 1036 | cxlflash_wait_for_pci_err_recovery(cfg); |
961487e4 | 1037 | goto out; |
c21e0bbf MO |
1038 | } |
1039 | } | |
1040 | ||
c21e0bbf | 1041 | out: |
fb67d44d | 1042 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf | 1043 | return rc; |
c21e0bbf MO |
1044 | } |
1045 | ||
1046 | /** | |
1047 | * init_scsi() - adds the host to the SCSI stack and kicks off host scan | |
1284fb0c | 1048 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 1049 | * |
1284fb0c | 1050 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
1051 | */ |
1052 | static int init_scsi(struct cxlflash_cfg *cfg) | |
1053 | { | |
1054 | struct pci_dev *pdev = cfg->dev; | |
fb67d44d | 1055 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
1056 | int rc = 0; |
1057 | ||
1058 | rc = scsi_add_host(cfg->host, &pdev->dev); | |
1059 | if (rc) { | |
fb67d44d | 1060 | dev_err(dev, "%s: scsi_add_host failed rc=%d\n", __func__, rc); |
c21e0bbf MO |
1061 | goto out; |
1062 | } | |
1063 | ||
1064 | scsi_scan_host(cfg->host); | |
1065 | ||
1066 | out: | |
fb67d44d | 1067 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf MO |
1068 | return rc; |
1069 | } | |
1070 | ||
1071 | /** | |
1072 | * set_port_online() - transitions the specified host FC port to online state | |
1073 | * @fc_regs: Top of MMIO region defined for specified port. | |
1074 | * | |
1075 | * The provided MMIO region must be mapped prior to call. Online state means | |
1076 | * that the FC link layer has synced, completed the handshaking process, and | |
1077 | * is ready for login to start. | |
1078 | */ | |
1786f4a0 | 1079 | static void set_port_online(__be64 __iomem *fc_regs) |
c21e0bbf MO |
1080 | { |
1081 | u64 cmdcfg; | |
1082 | ||
1083 | cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
1084 | cmdcfg &= (~FC_MTIP_CMDCONFIG_OFFLINE); /* clear OFF_LINE */ | |
1085 | cmdcfg |= (FC_MTIP_CMDCONFIG_ONLINE); /* set ON_LINE */ | |
1086 | writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
1087 | } | |
1088 | ||
1089 | /** | |
1090 | * set_port_offline() - transitions the specified host FC port to offline state | |
1091 | * @fc_regs: Top of MMIO region defined for specified port. | |
1092 | * | |
1093 | * The provided MMIO region must be mapped prior to call. | |
1094 | */ | |
1786f4a0 | 1095 | static void set_port_offline(__be64 __iomem *fc_regs) |
c21e0bbf MO |
1096 | { |
1097 | u64 cmdcfg; | |
1098 | ||
1099 | cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
1100 | cmdcfg &= (~FC_MTIP_CMDCONFIG_ONLINE); /* clear ON_LINE */ | |
1101 | cmdcfg |= (FC_MTIP_CMDCONFIG_OFFLINE); /* set OFF_LINE */ | |
1102 | writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
1103 | } | |
1104 | ||
1105 | /** | |
1106 | * wait_port_online() - waits for the specified host FC port come online | |
1107 | * @fc_regs: Top of MMIO region defined for specified port. | |
1108 | * @delay_us: Number of microseconds to delay between reading port status. | |
1109 | * @nretry: Number of cycles to retry reading port status. | |
1110 | * | |
1111 | * The provided MMIO region must be mapped prior to call. This will timeout | |
1112 | * when the cable is not plugged in. | |
1113 | * | |
1114 | * Return: | |
1115 | * TRUE (1) when the specified port is online | |
1116 | * FALSE (0) when the specified port fails to come online after timeout | |
c21e0bbf | 1117 | */ |
fb67d44d | 1118 | static bool wait_port_online(__be64 __iomem *fc_regs, u32 delay_us, u32 nretry) |
c21e0bbf MO |
1119 | { |
1120 | u64 status; | |
1121 | ||
fb67d44d | 1122 | WARN_ON(delay_us < 1000); |
c21e0bbf MO |
1123 | |
1124 | do { | |
1125 | msleep(delay_us / 1000); | |
1126 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); | |
05dab432 MO |
1127 | if (status == U64_MAX) |
1128 | nretry /= 2; | |
c21e0bbf MO |
1129 | } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_ONLINE && |
1130 | nretry--); | |
1131 | ||
1132 | return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_ONLINE); | |
1133 | } | |
1134 | ||
1135 | /** | |
1136 | * wait_port_offline() - waits for the specified host FC port go offline | |
1137 | * @fc_regs: Top of MMIO region defined for specified port. | |
1138 | * @delay_us: Number of microseconds to delay between reading port status. | |
1139 | * @nretry: Number of cycles to retry reading port status. | |
1140 | * | |
1141 | * The provided MMIO region must be mapped prior to call. | |
1142 | * | |
1143 | * Return: | |
1144 | * TRUE (1) when the specified port is offline | |
1145 | * FALSE (0) when the specified port fails to go offline after timeout | |
c21e0bbf | 1146 | */ |
fb67d44d | 1147 | static bool wait_port_offline(__be64 __iomem *fc_regs, u32 delay_us, u32 nretry) |
c21e0bbf MO |
1148 | { |
1149 | u64 status; | |
1150 | ||
fb67d44d | 1151 | WARN_ON(delay_us < 1000); |
c21e0bbf MO |
1152 | |
1153 | do { | |
1154 | msleep(delay_us / 1000); | |
1155 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); | |
05dab432 MO |
1156 | if (status == U64_MAX) |
1157 | nretry /= 2; | |
c21e0bbf MO |
1158 | } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_OFFLINE && |
1159 | nretry--); | |
1160 | ||
1161 | return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_OFFLINE); | |
1162 | } | |
1163 | ||
1164 | /** | |
1165 | * afu_set_wwpn() - configures the WWPN for the specified host FC port | |
1166 | * @afu: AFU associated with the host that owns the specified FC port. | |
1167 | * @port: Port number being configured. | |
1168 | * @fc_regs: Top of MMIO region defined for specified port. | |
1169 | * @wwpn: The world-wide-port-number previously discovered for port. | |
1170 | * | |
1171 | * The provided MMIO region must be mapped prior to call. As part of the | |
1172 | * sequence to configure the WWPN, the port is toggled offline and then back | |
1173 | * online. This toggling action can cause this routine to delay up to a few | |
1174 | * seconds. When configured to use the internal LUN feature of the AFU, a | |
1175 | * failure to come online is overridden. | |
c21e0bbf | 1176 | */ |
f8013261 MO |
1177 | static void afu_set_wwpn(struct afu *afu, int port, __be64 __iomem *fc_regs, |
1178 | u64 wwpn) | |
c21e0bbf | 1179 | { |
fb67d44d MO |
1180 | struct cxlflash_cfg *cfg = afu->parent; |
1181 | struct device *dev = &cfg->dev->dev; | |
1182 | ||
c21e0bbf | 1183 | set_port_offline(fc_regs); |
c21e0bbf MO |
1184 | if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, |
1185 | FC_PORT_STATUS_RETRY_CNT)) { | |
fb67d44d MO |
1186 | dev_dbg(dev, "%s: wait on port %d to go offline timed out\n", |
1187 | __func__, port); | |
c21e0bbf MO |
1188 | } |
1189 | ||
f8013261 | 1190 | writeq_be(wwpn, &fc_regs[FC_PNAME / 8]); |
964497b3 | 1191 | |
c21e0bbf | 1192 | set_port_online(fc_regs); |
c21e0bbf MO |
1193 | if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, |
1194 | FC_PORT_STATUS_RETRY_CNT)) { | |
fb67d44d MO |
1195 | dev_dbg(dev, "%s: wait on port %d to go online timed out\n", |
1196 | __func__, port); | |
c21e0bbf | 1197 | } |
c21e0bbf MO |
1198 | } |
1199 | ||
1200 | /** | |
1201 | * afu_link_reset() - resets the specified host FC port | |
1202 | * @afu: AFU associated with the host that owns the specified FC port. | |
1203 | * @port: Port number being configured. | |
1204 | * @fc_regs: Top of MMIO region defined for specified port. | |
1205 | * | |
1206 | * The provided MMIO region must be mapped prior to call. The sequence to | |
1207 | * reset the port involves toggling it offline and then back online. This | |
1208 | * action can cause this routine to delay up to a few seconds. An effort | |
1209 | * is made to maintain link with the device by switching to host to use | |
1210 | * the alternate port exclusively while the reset takes place. | |
1211 | * failure to come online is overridden. | |
1212 | */ | |
1786f4a0 | 1213 | static void afu_link_reset(struct afu *afu, int port, __be64 __iomem *fc_regs) |
c21e0bbf | 1214 | { |
fb67d44d MO |
1215 | struct cxlflash_cfg *cfg = afu->parent; |
1216 | struct device *dev = &cfg->dev->dev; | |
c21e0bbf MO |
1217 | u64 port_sel; |
1218 | ||
1219 | /* first switch the AFU to the other links, if any */ | |
1220 | port_sel = readq_be(&afu->afu_map->global.regs.afu_port_sel); | |
4da74db0 | 1221 | port_sel &= ~(1ULL << port); |
c21e0bbf MO |
1222 | writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); |
1223 | cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); | |
1224 | ||
1225 | set_port_offline(fc_regs); | |
1226 | if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
1227 | FC_PORT_STATUS_RETRY_CNT)) | |
fb67d44d MO |
1228 | dev_err(dev, "%s: wait on port %d to go offline timed out\n", |
1229 | __func__, port); | |
c21e0bbf MO |
1230 | |
1231 | set_port_online(fc_regs); | |
1232 | if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
1233 | FC_PORT_STATUS_RETRY_CNT)) | |
fb67d44d MO |
1234 | dev_err(dev, "%s: wait on port %d to go online timed out\n", |
1235 | __func__, port); | |
c21e0bbf MO |
1236 | |
1237 | /* switch back to include this port */ | |
4da74db0 | 1238 | port_sel |= (1ULL << port); |
c21e0bbf MO |
1239 | writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); |
1240 | cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); | |
1241 | ||
fb67d44d | 1242 | dev_dbg(dev, "%s: returning port_sel=%016llx\n", __func__, port_sel); |
c21e0bbf MO |
1243 | } |
1244 | ||
c21e0bbf MO |
1245 | /** |
1246 | * afu_err_intr_init() - clears and initializes the AFU for error interrupts | |
1247 | * @afu: AFU associated with the host. | |
1248 | */ | |
1249 | static void afu_err_intr_init(struct afu *afu) | |
1250 | { | |
78ae028e | 1251 | struct cxlflash_cfg *cfg = afu->parent; |
0aa14887 | 1252 | __be64 __iomem *fc_port_regs; |
c21e0bbf | 1253 | int i; |
bfc0bab1 | 1254 | struct hwq *hwq = get_hwq(afu, PRIMARY_HWQ); |
c21e0bbf MO |
1255 | u64 reg; |
1256 | ||
1257 | /* global async interrupts: AFU clears afu_ctrl on context exit | |
1258 | * if async interrupts were sent to that context. This prevents | |
1259 | * the AFU form sending further async interrupts when | |
1260 | * there is | |
1261 | * nobody to receive them. | |
1262 | */ | |
1263 | ||
1264 | /* mask all */ | |
1265 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_mask); | |
bfc0bab1 UK |
1266 | /* set LISN# to send and point to primary master context */ |
1267 | reg = ((u64) (((hwq->ctx_hndl << 8) | SISL_MSI_ASYNC_ERROR)) << 40); | |
c21e0bbf MO |
1268 | |
1269 | if (afu->internal_lun) | |
1270 | reg |= 1; /* Bit 63 indicates local lun */ | |
1271 | writeq_be(reg, &afu->afu_map->global.regs.afu_ctrl); | |
1272 | /* clear all */ | |
1273 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); | |
1274 | /* unmask bits that are of interest */ | |
1275 | /* note: afu can send an interrupt after this step */ | |
1276 | writeq_be(SISL_ASTATUS_MASK, &afu->afu_map->global.regs.aintr_mask); | |
1277 | /* clear again in case a bit came on after previous clear but before */ | |
1278 | /* unmask */ | |
1279 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); | |
1280 | ||
1281 | /* Clear/Set internal lun bits */ | |
0aa14887 MO |
1282 | fc_port_regs = get_fc_port_regs(cfg, 0); |
1283 | reg = readq_be(&fc_port_regs[FC_CONFIG2 / 8]); | |
c21e0bbf MO |
1284 | reg &= SISL_FC_INTERNAL_MASK; |
1285 | if (afu->internal_lun) | |
1286 | reg |= ((u64)(afu->internal_lun - 1) << SISL_FC_INTERNAL_SHIFT); | |
0aa14887 | 1287 | writeq_be(reg, &fc_port_regs[FC_CONFIG2 / 8]); |
c21e0bbf MO |
1288 | |
1289 | /* now clear FC errors */ | |
78ae028e | 1290 | for (i = 0; i < cfg->num_fc_ports; i++) { |
0aa14887 MO |
1291 | fc_port_regs = get_fc_port_regs(cfg, i); |
1292 | ||
1293 | writeq_be(0xFFFFFFFFU, &fc_port_regs[FC_ERROR / 8]); | |
1294 | writeq_be(0, &fc_port_regs[FC_ERRCAP / 8]); | |
c21e0bbf MO |
1295 | } |
1296 | ||
1297 | /* sync interrupts for master's IOARRIN write */ | |
1298 | /* note that unlike asyncs, there can be no pending sync interrupts */ | |
1299 | /* at this time (this is a fresh context and master has not written */ | |
1300 | /* IOARRIN yet), so there is nothing to clear. */ | |
1301 | ||
1302 | /* set LISN#, it is always sent to the context that wrote IOARRIN */ | |
3065267a | 1303 | for (i = 0; i < afu->num_hwqs; i++) { |
bfc0bab1 UK |
1304 | hwq = get_hwq(afu, i); |
1305 | ||
1306 | writeq_be(SISL_MSI_SYNC_ERROR, &hwq->host_map->ctx_ctrl); | |
1307 | writeq_be(SISL_ISTATUS_MASK, &hwq->host_map->intr_mask); | |
1308 | } | |
c21e0bbf MO |
1309 | } |
1310 | ||
1311 | /** | |
1312 | * cxlflash_sync_err_irq() - interrupt handler for synchronous errors | |
1313 | * @irq: Interrupt number. | |
1314 | * @data: Private data provided at interrupt registration, the AFU. | |
1315 | * | |
1316 | * Return: Always return IRQ_HANDLED. | |
1317 | */ | |
1318 | static irqreturn_t cxlflash_sync_err_irq(int irq, void *data) | |
1319 | { | |
bfc0bab1 UK |
1320 | struct hwq *hwq = (struct hwq *)data; |
1321 | struct cxlflash_cfg *cfg = hwq->afu->parent; | |
fb67d44d | 1322 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
1323 | u64 reg; |
1324 | u64 reg_unmasked; | |
1325 | ||
bfc0bab1 | 1326 | reg = readq_be(&hwq->host_map->intr_status); |
c21e0bbf MO |
1327 | reg_unmasked = (reg & SISL_ISTATUS_UNMASK); |
1328 | ||
1329 | if (reg_unmasked == 0UL) { | |
fb67d44d MO |
1330 | dev_err(dev, "%s: spurious interrupt, intr_status=%016llx\n", |
1331 | __func__, reg); | |
c21e0bbf MO |
1332 | goto cxlflash_sync_err_irq_exit; |
1333 | } | |
1334 | ||
fb67d44d MO |
1335 | dev_err(dev, "%s: unexpected interrupt, intr_status=%016llx\n", |
1336 | __func__, reg); | |
c21e0bbf | 1337 | |
bfc0bab1 | 1338 | writeq_be(reg_unmasked, &hwq->host_map->intr_clear); |
c21e0bbf MO |
1339 | |
1340 | cxlflash_sync_err_irq_exit: | |
c21e0bbf MO |
1341 | return IRQ_HANDLED; |
1342 | } | |
1343 | ||
1344 | /** | |
76a6ebbe MO |
1345 | * process_hrrq() - process the read-response queue |
1346 | * @afu: AFU associated with the host. | |
f918b4a8 | 1347 | * @doneq: Queue of commands harvested from the RRQ. |
cba06e6d | 1348 | * @budget: Threshold of RRQ entries to process. |
f918b4a8 MO |
1349 | * |
1350 | * This routine must be called holding the disabled RRQ spin lock. | |
c21e0bbf | 1351 | * |
76a6ebbe | 1352 | * Return: The number of entries processed. |
c21e0bbf | 1353 | */ |
bfc0bab1 | 1354 | static int process_hrrq(struct hwq *hwq, struct list_head *doneq, int budget) |
c21e0bbf | 1355 | { |
bfc0bab1 | 1356 | struct afu *afu = hwq->afu; |
c21e0bbf | 1357 | struct afu_cmd *cmd; |
696d0b0c MO |
1358 | struct sisl_ioasa *ioasa; |
1359 | struct sisl_ioarcb *ioarcb; | |
bfc0bab1 | 1360 | bool toggle = hwq->toggle; |
76a6ebbe | 1361 | int num_hrrq = 0; |
c21e0bbf | 1362 | u64 entry, |
bfc0bab1 UK |
1363 | *hrrq_start = hwq->hrrq_start, |
1364 | *hrrq_end = hwq->hrrq_end, | |
1365 | *hrrq_curr = hwq->hrrq_curr; | |
c21e0bbf | 1366 | |
cba06e6d | 1367 | /* Process ready RRQ entries up to the specified budget (if any) */ |
c21e0bbf MO |
1368 | while (true) { |
1369 | entry = *hrrq_curr; | |
1370 | ||
1371 | if ((entry & SISL_RESP_HANDLE_T_BIT) != toggle) | |
1372 | break; | |
1373 | ||
696d0b0c MO |
1374 | entry &= ~SISL_RESP_HANDLE_T_BIT; |
1375 | ||
1376 | if (afu_is_sq_cmd_mode(afu)) { | |
1377 | ioasa = (struct sisl_ioasa *)entry; | |
1378 | cmd = container_of(ioasa, struct afu_cmd, sa); | |
1379 | } else { | |
1380 | ioarcb = (struct sisl_ioarcb *)entry; | |
1381 | cmd = container_of(ioarcb, struct afu_cmd, rcb); | |
1382 | } | |
1383 | ||
f918b4a8 | 1384 | list_add_tail(&cmd->queue, doneq); |
c21e0bbf MO |
1385 | |
1386 | /* Advance to next entry or wrap and flip the toggle bit */ | |
1387 | if (hrrq_curr < hrrq_end) | |
1388 | hrrq_curr++; | |
1389 | else { | |
1390 | hrrq_curr = hrrq_start; | |
1391 | toggle ^= SISL_RESP_HANDLE_T_BIT; | |
1392 | } | |
696d0b0c | 1393 | |
bfc0bab1 | 1394 | atomic_inc(&hwq->hsq_credits); |
76a6ebbe | 1395 | num_hrrq++; |
cba06e6d MO |
1396 | |
1397 | if (budget > 0 && num_hrrq >= budget) | |
1398 | break; | |
c21e0bbf MO |
1399 | } |
1400 | ||
bfc0bab1 UK |
1401 | hwq->hrrq_curr = hrrq_curr; |
1402 | hwq->toggle = toggle; | |
c21e0bbf | 1403 | |
76a6ebbe MO |
1404 | return num_hrrq; |
1405 | } | |
1406 | ||
f918b4a8 MO |
1407 | /** |
1408 | * process_cmd_doneq() - process a queue of harvested RRQ commands | |
1409 | * @doneq: Queue of completed commands. | |
1410 | * | |
1411 | * Note that upon return the queue can no longer be trusted. | |
1412 | */ | |
1413 | static void process_cmd_doneq(struct list_head *doneq) | |
1414 | { | |
1415 | struct afu_cmd *cmd, *tmp; | |
1416 | ||
1417 | WARN_ON(list_empty(doneq)); | |
1418 | ||
1419 | list_for_each_entry_safe(cmd, tmp, doneq, queue) | |
1420 | cmd_complete(cmd); | |
1421 | } | |
1422 | ||
cba06e6d MO |
1423 | /** |
1424 | * cxlflash_irqpoll() - process a queue of harvested RRQ commands | |
1425 | * @irqpoll: IRQ poll structure associated with queue to poll. | |
1426 | * @budget: Threshold of RRQ entries to process per poll. | |
1427 | * | |
1428 | * Return: The number of entries processed. | |
1429 | */ | |
1430 | static int cxlflash_irqpoll(struct irq_poll *irqpoll, int budget) | |
1431 | { | |
bfc0bab1 | 1432 | struct hwq *hwq = container_of(irqpoll, struct hwq, irqpoll); |
cba06e6d MO |
1433 | unsigned long hrrq_flags; |
1434 | LIST_HEAD(doneq); | |
1435 | int num_entries = 0; | |
1436 | ||
bfc0bab1 | 1437 | spin_lock_irqsave(&hwq->hrrq_slock, hrrq_flags); |
cba06e6d | 1438 | |
bfc0bab1 | 1439 | num_entries = process_hrrq(hwq, &doneq, budget); |
cba06e6d MO |
1440 | if (num_entries < budget) |
1441 | irq_poll_complete(irqpoll); | |
1442 | ||
bfc0bab1 | 1443 | spin_unlock_irqrestore(&hwq->hrrq_slock, hrrq_flags); |
cba06e6d MO |
1444 | |
1445 | process_cmd_doneq(&doneq); | |
1446 | return num_entries; | |
1447 | } | |
1448 | ||
76a6ebbe MO |
1449 | /** |
1450 | * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path) | |
1451 | * @irq: Interrupt number. | |
1452 | * @data: Private data provided at interrupt registration, the AFU. | |
1453 | * | |
f918b4a8 | 1454 | * Return: IRQ_HANDLED or IRQ_NONE when no ready entries found. |
76a6ebbe MO |
1455 | */ |
1456 | static irqreturn_t cxlflash_rrq_irq(int irq, void *data) | |
1457 | { | |
bfc0bab1 UK |
1458 | struct hwq *hwq = (struct hwq *)data; |
1459 | struct afu *afu = hwq->afu; | |
f918b4a8 MO |
1460 | unsigned long hrrq_flags; |
1461 | LIST_HEAD(doneq); | |
1462 | int num_entries = 0; | |
76a6ebbe | 1463 | |
bfc0bab1 | 1464 | spin_lock_irqsave(&hwq->hrrq_slock, hrrq_flags); |
cba06e6d MO |
1465 | |
1466 | if (afu_is_irqpoll_enabled(afu)) { | |
bfc0bab1 UK |
1467 | irq_poll_sched(&hwq->irqpoll); |
1468 | spin_unlock_irqrestore(&hwq->hrrq_slock, hrrq_flags); | |
cba06e6d MO |
1469 | return IRQ_HANDLED; |
1470 | } | |
1471 | ||
bfc0bab1 UK |
1472 | num_entries = process_hrrq(hwq, &doneq, -1); |
1473 | spin_unlock_irqrestore(&hwq->hrrq_slock, hrrq_flags); | |
f918b4a8 MO |
1474 | |
1475 | if (num_entries == 0) | |
1476 | return IRQ_NONE; | |
1477 | ||
1478 | process_cmd_doneq(&doneq); | |
c21e0bbf MO |
1479 | return IRQ_HANDLED; |
1480 | } | |
1481 | ||
e2ef33fa MO |
1482 | /* |
1483 | * Asynchronous interrupt information table | |
1484 | * | |
1485 | * NOTE: | |
1486 | * - Order matters here as this array is indexed by bit position. | |
1487 | * | |
1488 | * - The checkpatch script considers the BUILD_SISL_ASTATUS_FC_PORT macro | |
1489 | * as complex and complains due to a lack of parentheses/braces. | |
1490 | */ | |
1491 | #define ASTATUS_FC(_a, _b, _c, _d) \ | |
1492 | { SISL_ASTATUS_FC##_a##_##_b, _c, _a, (_d) } | |
1493 | ||
1494 | #define BUILD_SISL_ASTATUS_FC_PORT(_a) \ | |
1495 | ASTATUS_FC(_a, LINK_UP, "link up", 0), \ | |
1496 | ASTATUS_FC(_a, LINK_DN, "link down", 0), \ | |
1497 | ASTATUS_FC(_a, LOGI_S, "login succeeded", SCAN_HOST), \ | |
1498 | ASTATUS_FC(_a, LOGI_F, "login failed", CLR_FC_ERROR), \ | |
1499 | ASTATUS_FC(_a, LOGI_R, "login timed out, retrying", LINK_RESET), \ | |
1500 | ASTATUS_FC(_a, CRC_T, "CRC threshold exceeded", LINK_RESET), \ | |
1501 | ASTATUS_FC(_a, LOGO, "target initiated LOGO", 0), \ | |
1502 | ASTATUS_FC(_a, OTHER, "other error", CLR_FC_ERROR | LINK_RESET) | |
1503 | ||
1504 | static const struct asyc_intr_info ainfo[] = { | |
1505 | BUILD_SISL_ASTATUS_FC_PORT(1), | |
1506 | BUILD_SISL_ASTATUS_FC_PORT(0), | |
1507 | BUILD_SISL_ASTATUS_FC_PORT(3), | |
1508 | BUILD_SISL_ASTATUS_FC_PORT(2) | |
1509 | }; | |
1510 | ||
c21e0bbf MO |
1511 | /** |
1512 | * cxlflash_async_err_irq() - interrupt handler for asynchronous errors | |
1513 | * @irq: Interrupt number. | |
1514 | * @data: Private data provided at interrupt registration, the AFU. | |
1515 | * | |
1516 | * Return: Always return IRQ_HANDLED. | |
1517 | */ | |
1518 | static irqreturn_t cxlflash_async_err_irq(int irq, void *data) | |
1519 | { | |
bfc0bab1 UK |
1520 | struct hwq *hwq = (struct hwq *)data; |
1521 | struct afu *afu = hwq->afu; | |
4392ba49 MO |
1522 | struct cxlflash_cfg *cfg = afu->parent; |
1523 | struct device *dev = &cfg->dev->dev; | |
c21e0bbf | 1524 | const struct asyc_intr_info *info; |
1786f4a0 | 1525 | struct sisl_global_map __iomem *global = &afu->afu_map->global; |
0aa14887 | 1526 | __be64 __iomem *fc_port_regs; |
e2ef33fa | 1527 | u64 reg_unmasked; |
c21e0bbf | 1528 | u64 reg; |
e2ef33fa | 1529 | u64 bit; |
c21e0bbf | 1530 | u8 port; |
c21e0bbf | 1531 | |
c21e0bbf MO |
1532 | reg = readq_be(&global->regs.aintr_status); |
1533 | reg_unmasked = (reg & SISL_ASTATUS_UNMASK); | |
1534 | ||
e2ef33fa | 1535 | if (unlikely(reg_unmasked == 0)) { |
fb67d44d | 1536 | dev_err(dev, "%s: spurious interrupt, aintr_status=%016llx\n", |
4392ba49 | 1537 | __func__, reg); |
c21e0bbf MO |
1538 | goto out; |
1539 | } | |
1540 | ||
f15fbf8d | 1541 | /* FYI, it is 'okay' to clear AFU status before FC_ERROR */ |
c21e0bbf MO |
1542 | writeq_be(reg_unmasked, &global->regs.aintr_clear); |
1543 | ||
f15fbf8d | 1544 | /* Check each bit that is on */ |
e2ef33fa MO |
1545 | for_each_set_bit(bit, (ulong *)®_unmasked, BITS_PER_LONG) { |
1546 | if (unlikely(bit >= ARRAY_SIZE(ainfo))) { | |
1547 | WARN_ON_ONCE(1); | |
c21e0bbf | 1548 | continue; |
e2ef33fa MO |
1549 | } |
1550 | ||
1551 | info = &ainfo[bit]; | |
1552 | if (unlikely(info->status != 1ULL << bit)) { | |
1553 | WARN_ON_ONCE(1); | |
1554 | continue; | |
1555 | } | |
c21e0bbf MO |
1556 | |
1557 | port = info->port; | |
0aa14887 | 1558 | fc_port_regs = get_fc_port_regs(cfg, port); |
c21e0bbf | 1559 | |
fb67d44d | 1560 | dev_err(dev, "%s: FC Port %d -> %s, fc_status=%016llx\n", |
4392ba49 | 1561 | __func__, port, info->desc, |
0aa14887 | 1562 | readq_be(&fc_port_regs[FC_STATUS / 8])); |
c21e0bbf MO |
1563 | |
1564 | /* | |
f15fbf8d | 1565 | * Do link reset first, some OTHER errors will set FC_ERROR |
c21e0bbf MO |
1566 | * again if cleared before or w/o a reset |
1567 | */ | |
1568 | if (info->action & LINK_RESET) { | |
4392ba49 MO |
1569 | dev_err(dev, "%s: FC Port %d: resetting link\n", |
1570 | __func__, port); | |
c21e0bbf MO |
1571 | cfg->lr_state = LINK_RESET_REQUIRED; |
1572 | cfg->lr_port = port; | |
1573 | schedule_work(&cfg->work_q); | |
1574 | } | |
1575 | ||
1576 | if (info->action & CLR_FC_ERROR) { | |
0aa14887 | 1577 | reg = readq_be(&fc_port_regs[FC_ERROR / 8]); |
c21e0bbf MO |
1578 | |
1579 | /* | |
f15fbf8d | 1580 | * Since all errors are unmasked, FC_ERROR and FC_ERRCAP |
c21e0bbf MO |
1581 | * should be the same and tracing one is sufficient. |
1582 | */ | |
1583 | ||
fb67d44d | 1584 | dev_err(dev, "%s: fc %d: clearing fc_error=%016llx\n", |
4392ba49 | 1585 | __func__, port, reg); |
c21e0bbf | 1586 | |
0aa14887 MO |
1587 | writeq_be(reg, &fc_port_regs[FC_ERROR / 8]); |
1588 | writeq_be(0, &fc_port_regs[FC_ERRCAP / 8]); | |
c21e0bbf | 1589 | } |
ef51074a MO |
1590 | |
1591 | if (info->action & SCAN_HOST) { | |
1592 | atomic_inc(&cfg->scan_host_needed); | |
1593 | schedule_work(&cfg->work_q); | |
1594 | } | |
c21e0bbf MO |
1595 | } |
1596 | ||
1597 | out: | |
c21e0bbf MO |
1598 | return IRQ_HANDLED; |
1599 | } | |
1600 | ||
c21e0bbf MO |
1601 | /** |
1602 | * read_vpd() - obtains the WWPNs from VPD | |
1284fb0c | 1603 | * @cfg: Internal structure associated with the host. |
78ae028e | 1604 | * @wwpn: Array of size MAX_FC_PORTS to pass back WWPNs |
c21e0bbf | 1605 | * |
1284fb0c | 1606 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
1607 | */ |
1608 | static int read_vpd(struct cxlflash_cfg *cfg, u64 wwpn[]) | |
1609 | { | |
fb67d44d MO |
1610 | struct device *dev = &cfg->dev->dev; |
1611 | struct pci_dev *pdev = cfg->dev; | |
c21e0bbf MO |
1612 | int rc = 0; |
1613 | int ro_start, ro_size, i, j, k; | |
1614 | ssize_t vpd_size; | |
1615 | char vpd_data[CXLFLASH_VPD_LEN]; | |
1616 | char tmp_buf[WWPN_BUF_LEN] = { 0 }; | |
0d419130 MO |
1617 | const struct dev_dependent_vals *ddv = (struct dev_dependent_vals *) |
1618 | cfg->dev_id->driver_data; | |
1619 | const bool wwpn_vpd_required = ddv->flags & CXLFLASH_WWPN_VPD_REQUIRED; | |
1620 | const char *wwpn_vpd_tags[MAX_FC_PORTS] = { "V5", "V6", "V7", "V8" }; | |
c21e0bbf MO |
1621 | |
1622 | /* Get the VPD data from the device */ | |
29b4894f | 1623 | vpd_size = cfg->ops->read_adapter_vpd(pdev, vpd_data, sizeof(vpd_data)); |
c21e0bbf | 1624 | if (unlikely(vpd_size <= 0)) { |
fb67d44d MO |
1625 | dev_err(dev, "%s: Unable to read VPD (size = %ld)\n", |
1626 | __func__, vpd_size); | |
c21e0bbf MO |
1627 | rc = -ENODEV; |
1628 | goto out; | |
1629 | } | |
1630 | ||
1631 | /* Get the read only section offset */ | |
1632 | ro_start = pci_vpd_find_tag(vpd_data, 0, vpd_size, | |
1633 | PCI_VPD_LRDT_RO_DATA); | |
1634 | if (unlikely(ro_start < 0)) { | |
fb67d44d | 1635 | dev_err(dev, "%s: VPD Read-only data not found\n", __func__); |
c21e0bbf MO |
1636 | rc = -ENODEV; |
1637 | goto out; | |
1638 | } | |
1639 | ||
1640 | /* Get the read only section size, cap when extends beyond read VPD */ | |
1641 | ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]); | |
1642 | j = ro_size; | |
1643 | i = ro_start + PCI_VPD_LRDT_TAG_SIZE; | |
1644 | if (unlikely((i + j) > vpd_size)) { | |
fb67d44d MO |
1645 | dev_dbg(dev, "%s: Might need to read more VPD (%d > %ld)\n", |
1646 | __func__, (i + j), vpd_size); | |
c21e0bbf MO |
1647 | ro_size = vpd_size - i; |
1648 | } | |
1649 | ||
1650 | /* | |
1651 | * Find the offset of the WWPN tag within the read only | |
1652 | * VPD data and validate the found field (partials are | |
1653 | * no good to us). Convert the ASCII data to an integer | |
1654 | * value. Note that we must copy to a temporary buffer | |
1655 | * because the conversion service requires that the ASCII | |
1656 | * string be terminated. | |
0d419130 MO |
1657 | * |
1658 | * Allow for WWPN not being found for all devices, setting | |
1659 | * the returned WWPN to zero when not found. Notify with a | |
1660 | * log error for cards that should have had WWPN keywords | |
1661 | * in the VPD - cards requiring WWPN will not have their | |
1662 | * ports programmed and operate in an undefined state. | |
c21e0bbf | 1663 | */ |
78ae028e | 1664 | for (k = 0; k < cfg->num_fc_ports; k++) { |
c21e0bbf MO |
1665 | j = ro_size; |
1666 | i = ro_start + PCI_VPD_LRDT_TAG_SIZE; | |
1667 | ||
1668 | i = pci_vpd_find_info_keyword(vpd_data, i, j, wwpn_vpd_tags[k]); | |
0d419130 MO |
1669 | if (i < 0) { |
1670 | if (wwpn_vpd_required) | |
1671 | dev_err(dev, "%s: Port %d WWPN not found\n", | |
1672 | __func__, k); | |
1673 | wwpn[k] = 0ULL; | |
1674 | continue; | |
c21e0bbf MO |
1675 | } |
1676 | ||
1677 | j = pci_vpd_info_field_size(&vpd_data[i]); | |
1678 | i += PCI_VPD_INFO_FLD_HDR_SIZE; | |
1679 | if (unlikely((i + j > vpd_size) || (j != WWPN_LEN))) { | |
fb67d44d MO |
1680 | dev_err(dev, "%s: Port %d WWPN incomplete or bad VPD\n", |
1681 | __func__, k); | |
c21e0bbf MO |
1682 | rc = -ENODEV; |
1683 | goto out; | |
1684 | } | |
1685 | ||
1686 | memcpy(tmp_buf, &vpd_data[i], WWPN_LEN); | |
1687 | rc = kstrtoul(tmp_buf, WWPN_LEN, (ulong *)&wwpn[k]); | |
1688 | if (unlikely(rc)) { | |
fb67d44d MO |
1689 | dev_err(dev, "%s: WWPN conversion failed for port %d\n", |
1690 | __func__, k); | |
c21e0bbf MO |
1691 | rc = -ENODEV; |
1692 | goto out; | |
1693 | } | |
78ae028e MO |
1694 | |
1695 | dev_dbg(dev, "%s: wwpn%d=%016llx\n", __func__, k, wwpn[k]); | |
c21e0bbf MO |
1696 | } |
1697 | ||
1698 | out: | |
fb67d44d | 1699 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf MO |
1700 | return rc; |
1701 | } | |
1702 | ||
1703 | /** | |
15305514 | 1704 | * init_pcr() - initialize the provisioning and control registers |
1284fb0c | 1705 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 1706 | * |
15305514 MO |
1707 | * Also sets up fast access to the mapped registers and initializes AFU |
1708 | * command fields that never change. | |
c21e0bbf | 1709 | */ |
15305514 | 1710 | static void init_pcr(struct cxlflash_cfg *cfg) |
c21e0bbf MO |
1711 | { |
1712 | struct afu *afu = cfg->afu; | |
1786f4a0 | 1713 | struct sisl_ctrl_map __iomem *ctrl_map; |
bfc0bab1 | 1714 | struct hwq *hwq; |
29b4894f | 1715 | void *cookie; |
c21e0bbf MO |
1716 | int i; |
1717 | ||
1718 | for (i = 0; i < MAX_CONTEXT; i++) { | |
1719 | ctrl_map = &afu->afu_map->ctrls[i].ctrl; | |
f15fbf8d MO |
1720 | /* Disrupt any clients that could be running */ |
1721 | /* e.g. clients that survived a master restart */ | |
c21e0bbf MO |
1722 | writeq_be(0, &ctrl_map->rht_start); |
1723 | writeq_be(0, &ctrl_map->rht_cnt_id); | |
1724 | writeq_be(0, &ctrl_map->ctx_cap); | |
1725 | } | |
1726 | ||
bfc0bab1 | 1727 | /* Copy frequently used fields into hwq */ |
3065267a | 1728 | for (i = 0; i < afu->num_hwqs; i++) { |
bfc0bab1 | 1729 | hwq = get_hwq(afu, i); |
29b4894f | 1730 | cookie = hwq->ctx_cookie; |
bfc0bab1 | 1731 | |
29b4894f | 1732 | hwq->ctx_hndl = (u16) cfg->ops->process_element(cookie); |
bfc0bab1 UK |
1733 | hwq->host_map = &afu->afu_map->hosts[hwq->ctx_hndl].host; |
1734 | hwq->ctrl_map = &afu->afu_map->ctrls[hwq->ctx_hndl].ctrl; | |
c21e0bbf | 1735 | |
bfc0bab1 UK |
1736 | /* Program the Endian Control for the master context */ |
1737 | writeq_be(SISL_ENDIAN_CTRL, &hwq->host_map->endian_ctrl); | |
1738 | } | |
c21e0bbf MO |
1739 | } |
1740 | ||
1741 | /** | |
1742 | * init_global() - initialize AFU global registers | |
1284fb0c | 1743 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 1744 | */ |
15305514 | 1745 | static int init_global(struct cxlflash_cfg *cfg) |
c21e0bbf MO |
1746 | { |
1747 | struct afu *afu = cfg->afu; | |
4392ba49 | 1748 | struct device *dev = &cfg->dev->dev; |
bfc0bab1 UK |
1749 | struct hwq *hwq; |
1750 | struct sisl_host_map __iomem *hmap; | |
0aa14887 | 1751 | __be64 __iomem *fc_port_regs; |
78ae028e | 1752 | u64 wwpn[MAX_FC_PORTS]; /* wwpn of AFU ports */ |
c21e0bbf MO |
1753 | int i = 0, num_ports = 0; |
1754 | int rc = 0; | |
1755 | u64 reg; | |
1756 | ||
1757 | rc = read_vpd(cfg, &wwpn[0]); | |
1758 | if (rc) { | |
4392ba49 | 1759 | dev_err(dev, "%s: could not read vpd rc=%d\n", __func__, rc); |
c21e0bbf MO |
1760 | goto out; |
1761 | } | |
1762 | ||
bfc0bab1 | 1763 | /* Set up RRQ and SQ in HWQ for master issued cmds */ |
3065267a | 1764 | for (i = 0; i < afu->num_hwqs; i++) { |
bfc0bab1 UK |
1765 | hwq = get_hwq(afu, i); |
1766 | hmap = hwq->host_map; | |
c21e0bbf | 1767 | |
bfc0bab1 UK |
1768 | writeq_be((u64) hwq->hrrq_start, &hmap->rrq_start); |
1769 | writeq_be((u64) hwq->hrrq_end, &hmap->rrq_end); | |
1770 | ||
1771 | if (afu_is_sq_cmd_mode(afu)) { | |
1772 | writeq_be((u64)hwq->hsq_start, &hmap->sq_start); | |
1773 | writeq_be((u64)hwq->hsq_end, &hmap->sq_end); | |
1774 | } | |
696d0b0c MO |
1775 | } |
1776 | ||
c21e0bbf MO |
1777 | /* AFU configuration */ |
1778 | reg = readq_be(&afu->afu_map->global.regs.afu_config); | |
1779 | reg |= SISL_AFUCONF_AR_ALL|SISL_AFUCONF_ENDIAN; | |
1780 | /* enable all auto retry options and control endianness */ | |
1781 | /* leave others at default: */ | |
1782 | /* CTX_CAP write protected, mbox_r does not clear on read and */ | |
1783 | /* checker on if dual afu */ | |
1784 | writeq_be(reg, &afu->afu_map->global.regs.afu_config); | |
1785 | ||
f15fbf8d | 1786 | /* Global port select: select either port */ |
c21e0bbf | 1787 | if (afu->internal_lun) { |
f15fbf8d | 1788 | /* Only use port 0 */ |
c21e0bbf | 1789 | writeq_be(PORT0, &afu->afu_map->global.regs.afu_port_sel); |
78ae028e | 1790 | num_ports = 0; |
c21e0bbf | 1791 | } else { |
8fa4f177 MO |
1792 | writeq_be(PORT_MASK(cfg->num_fc_ports), |
1793 | &afu->afu_map->global.regs.afu_port_sel); | |
78ae028e | 1794 | num_ports = cfg->num_fc_ports; |
c21e0bbf MO |
1795 | } |
1796 | ||
1797 | for (i = 0; i < num_ports; i++) { | |
0aa14887 MO |
1798 | fc_port_regs = get_fc_port_regs(cfg, i); |
1799 | ||
f15fbf8d | 1800 | /* Unmask all errors (but they are still masked at AFU) */ |
0aa14887 | 1801 | writeq_be(0, &fc_port_regs[FC_ERRMSK / 8]); |
f15fbf8d | 1802 | /* Clear CRC error cnt & set a threshold */ |
0aa14887 MO |
1803 | (void)readq_be(&fc_port_regs[FC_CNT_CRCERR / 8]); |
1804 | writeq_be(MC_CRC_THRESH, &fc_port_regs[FC_CRC_THRESH / 8]); | |
c21e0bbf | 1805 | |
f15fbf8d | 1806 | /* Set WWPNs. If already programmed, wwpn[i] is 0 */ |
f8013261 | 1807 | if (wwpn[i] != 0) |
0aa14887 | 1808 | afu_set_wwpn(afu, i, &fc_port_regs[0], wwpn[i]); |
c21e0bbf MO |
1809 | /* Programming WWPN back to back causes additional |
1810 | * offline/online transitions and a PLOGI | |
1811 | */ | |
1812 | msleep(100); | |
c21e0bbf MO |
1813 | } |
1814 | ||
f15fbf8d MO |
1815 | /* Set up master's own CTX_CAP to allow real mode, host translation */ |
1816 | /* tables, afu cmds and read/write GSCSI cmds. */ | |
c21e0bbf | 1817 | /* First, unlock ctx_cap write by reading mbox */ |
3065267a | 1818 | for (i = 0; i < afu->num_hwqs; i++) { |
bfc0bab1 UK |
1819 | hwq = get_hwq(afu, i); |
1820 | ||
1821 | (void)readq_be(&hwq->ctrl_map->mbox_r); /* unlock ctx_cap */ | |
1822 | writeq_be((SISL_CTX_CAP_REAL_MODE | SISL_CTX_CAP_HOST_XLATE | | |
1823 | SISL_CTX_CAP_READ_CMD | SISL_CTX_CAP_WRITE_CMD | | |
1824 | SISL_CTX_CAP_AFU_CMD | SISL_CTX_CAP_GSCSI_CMD), | |
1825 | &hwq->ctrl_map->ctx_cap); | |
1826 | } | |
3223c01a MO |
1827 | |
1828 | /* | |
1829 | * Determine write-same unmap support for host by evaluating the unmap | |
1830 | * sector support bit of the context control register associated with | |
1831 | * the primary hardware queue. Note that while this status is reflected | |
1832 | * in a context register, the outcome can be assumed to be host-wide. | |
1833 | */ | |
1834 | hwq = get_hwq(afu, PRIMARY_HWQ); | |
1835 | reg = readq_be(&hwq->host_map->ctx_ctrl); | |
1836 | if (reg & SISL_CTX_CTRL_UNMAP_SECTOR) | |
1837 | cfg->ws_unmap = true; | |
1838 | ||
f15fbf8d | 1839 | /* Initialize heartbeat */ |
c21e0bbf | 1840 | afu->hb = readq_be(&afu->afu_map->global.regs.afu_hb); |
c21e0bbf MO |
1841 | out: |
1842 | return rc; | |
1843 | } | |
1844 | ||
1845 | /** | |
1846 | * start_afu() - initializes and starts the AFU | |
1284fb0c | 1847 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1848 | */ |
1849 | static int start_afu(struct cxlflash_cfg *cfg) | |
1850 | { | |
1851 | struct afu *afu = cfg->afu; | |
fb67d44d | 1852 | struct device *dev = &cfg->dev->dev; |
bfc0bab1 | 1853 | struct hwq *hwq; |
c21e0bbf | 1854 | int rc = 0; |
bfc0bab1 | 1855 | int i; |
c21e0bbf | 1856 | |
c21e0bbf MO |
1857 | init_pcr(cfg); |
1858 | ||
bfc0bab1 | 1859 | /* Initialize each HWQ */ |
3065267a | 1860 | for (i = 0; i < afu->num_hwqs; i++) { |
bfc0bab1 | 1861 | hwq = get_hwq(afu, i); |
c21e0bbf | 1862 | |
bfc0bab1 UK |
1863 | /* After an AFU reset, RRQ entries are stale, clear them */ |
1864 | memset(&hwq->rrq_entry, 0, sizeof(hwq->rrq_entry)); | |
696d0b0c | 1865 | |
bfc0bab1 UK |
1866 | /* Initialize RRQ pointers */ |
1867 | hwq->hrrq_start = &hwq->rrq_entry[0]; | |
1868 | hwq->hrrq_end = &hwq->rrq_entry[NUM_RRQ_ENTRY - 1]; | |
1869 | hwq->hrrq_curr = hwq->hrrq_start; | |
1870 | hwq->toggle = 1; | |
66ea9bcc UK |
1871 | |
1872 | /* Initialize spin locks */ | |
bfc0bab1 | 1873 | spin_lock_init(&hwq->hrrq_slock); |
66ea9bcc | 1874 | spin_lock_init(&hwq->hsq_slock); |
696d0b0c | 1875 | |
bfc0bab1 UK |
1876 | /* Initialize SQ */ |
1877 | if (afu_is_sq_cmd_mode(afu)) { | |
1878 | memset(&hwq->sq, 0, sizeof(hwq->sq)); | |
1879 | hwq->hsq_start = &hwq->sq[0]; | |
1880 | hwq->hsq_end = &hwq->sq[NUM_SQ_ENTRY - 1]; | |
1881 | hwq->hsq_curr = hwq->hsq_start; | |
1882 | ||
bfc0bab1 UK |
1883 | atomic_set(&hwq->hsq_credits, NUM_SQ_ENTRY - 1); |
1884 | } | |
1885 | ||
1886 | /* Initialize IRQ poll */ | |
1887 | if (afu_is_irqpoll_enabled(afu)) | |
1888 | irq_poll_init(&hwq->irqpoll, afu->irqpoll_weight, | |
1889 | cxlflash_irqpoll); | |
1890 | ||
1891 | } | |
cba06e6d | 1892 | |
c21e0bbf MO |
1893 | rc = init_global(cfg); |
1894 | ||
fb67d44d | 1895 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf MO |
1896 | return rc; |
1897 | } | |
1898 | ||
1899 | /** | |
9526f360 | 1900 | * init_intr() - setup interrupt handlers for the master context |
1284fb0c | 1901 | * @cfg: Internal structure associated with the host. |
bfc0bab1 | 1902 | * @hwq: Hardware queue to initialize. |
c21e0bbf | 1903 | * |
1284fb0c | 1904 | * Return: 0 on success, -errno on failure |
c21e0bbf | 1905 | */ |
9526f360 | 1906 | static enum undo_level init_intr(struct cxlflash_cfg *cfg, |
bfc0bab1 | 1907 | struct hwq *hwq) |
c21e0bbf | 1908 | { |
9526f360 | 1909 | struct device *dev = &cfg->dev->dev; |
ee9f9eea | 1910 | void *ctx = hwq->ctx_cookie; |
c21e0bbf | 1911 | int rc = 0; |
9526f360 | 1912 | enum undo_level level = UNDO_NOOP; |
bfc0bab1 | 1913 | bool is_primary_hwq = (hwq->index == PRIMARY_HWQ); |
77ee1667 | 1914 | int num_irqs = hwq->num_irqs; |
c21e0bbf | 1915 | |
29b4894f | 1916 | rc = cfg->ops->allocate_afu_irqs(ctx, num_irqs); |
c21e0bbf | 1917 | if (unlikely(rc)) { |
fb67d44d | 1918 | dev_err(dev, "%s: allocate_afu_irqs failed rc=%d\n", |
c21e0bbf | 1919 | __func__, rc); |
9526f360 | 1920 | level = UNDO_NOOP; |
c21e0bbf MO |
1921 | goto out; |
1922 | } | |
1923 | ||
29b4894f MO |
1924 | rc = cfg->ops->map_afu_irq(ctx, 1, cxlflash_sync_err_irq, hwq, |
1925 | "SISL_MSI_SYNC_ERROR"); | |
c21e0bbf | 1926 | if (unlikely(rc <= 0)) { |
fb67d44d | 1927 | dev_err(dev, "%s: SISL_MSI_SYNC_ERROR map failed\n", __func__); |
c21e0bbf MO |
1928 | level = FREE_IRQ; |
1929 | goto out; | |
1930 | } | |
1931 | ||
29b4894f MO |
1932 | rc = cfg->ops->map_afu_irq(ctx, 2, cxlflash_rrq_irq, hwq, |
1933 | "SISL_MSI_RRQ_UPDATED"); | |
c21e0bbf | 1934 | if (unlikely(rc <= 0)) { |
fb67d44d | 1935 | dev_err(dev, "%s: SISL_MSI_RRQ_UPDATED map failed\n", __func__); |
c21e0bbf MO |
1936 | level = UNMAP_ONE; |
1937 | goto out; | |
1938 | } | |
1939 | ||
bfc0bab1 UK |
1940 | /* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */ |
1941 | if (!is_primary_hwq) | |
1942 | goto out; | |
1943 | ||
29b4894f MO |
1944 | rc = cfg->ops->map_afu_irq(ctx, 3, cxlflash_async_err_irq, hwq, |
1945 | "SISL_MSI_ASYNC_ERROR"); | |
c21e0bbf | 1946 | if (unlikely(rc <= 0)) { |
fb67d44d | 1947 | dev_err(dev, "%s: SISL_MSI_ASYNC_ERROR map failed\n", __func__); |
c21e0bbf MO |
1948 | level = UNMAP_TWO; |
1949 | goto out; | |
1950 | } | |
9526f360 MK |
1951 | out: |
1952 | return level; | |
1953 | } | |
c21e0bbf | 1954 | |
9526f360 MK |
1955 | /** |
1956 | * init_mc() - create and register as the master context | |
1957 | * @cfg: Internal structure associated with the host. | |
bfc0bab1 | 1958 | * index: HWQ Index of the master context. |
9526f360 MK |
1959 | * |
1960 | * Return: 0 on success, -errno on failure | |
1961 | */ | |
bfc0bab1 | 1962 | static int init_mc(struct cxlflash_cfg *cfg, u32 index) |
9526f360 | 1963 | { |
ee9f9eea | 1964 | void *ctx; |
9526f360 | 1965 | struct device *dev = &cfg->dev->dev; |
bfc0bab1 | 1966 | struct hwq *hwq = get_hwq(cfg->afu, index); |
9526f360 | 1967 | int rc = 0; |
77ee1667 | 1968 | int num_irqs; |
9526f360 MK |
1969 | enum undo_level level; |
1970 | ||
bfc0bab1 UK |
1971 | hwq->afu = cfg->afu; |
1972 | hwq->index = index; | |
a002bf83 | 1973 | INIT_LIST_HEAD(&hwq->pending_cmds); |
bfc0bab1 | 1974 | |
77ee1667 | 1975 | if (index == PRIMARY_HWQ) { |
29b4894f | 1976 | ctx = cfg->ops->get_context(cfg->dev, cfg->afu_cookie); |
77ee1667 UK |
1977 | num_irqs = 3; |
1978 | } else { | |
29b4894f | 1979 | ctx = cfg->ops->dev_context_init(cfg->dev, cfg->afu_cookie); |
77ee1667 UK |
1980 | num_irqs = 2; |
1981 | } | |
4a275afe | 1982 | if (IS_ERR_OR_NULL(ctx)) { |
9526f360 | 1983 | rc = -ENOMEM; |
bfc0bab1 | 1984 | goto err1; |
9526f360 | 1985 | } |
bfc0bab1 | 1986 | |
ee9f9eea UK |
1987 | WARN_ON(hwq->ctx_cookie); |
1988 | hwq->ctx_cookie = ctx; | |
77ee1667 | 1989 | hwq->num_irqs = num_irqs; |
9526f360 MK |
1990 | |
1991 | /* Set it up as a master with the CXL */ | |
29b4894f | 1992 | cfg->ops->set_master(ctx); |
9526f360 | 1993 | |
bfc0bab1 UK |
1994 | /* Reset AFU when initializing primary context */ |
1995 | if (index == PRIMARY_HWQ) { | |
29b4894f | 1996 | rc = cfg->ops->afu_reset(ctx); |
bfc0bab1 UK |
1997 | if (unlikely(rc)) { |
1998 | dev_err(dev, "%s: AFU reset failed rc=%d\n", | |
1999 | __func__, rc); | |
2000 | goto err1; | |
2001 | } | |
9526f360 MK |
2002 | } |
2003 | ||
bfc0bab1 | 2004 | level = init_intr(cfg, hwq); |
9526f360 | 2005 | if (unlikely(level)) { |
fb67d44d | 2006 | dev_err(dev, "%s: interrupt init failed rc=%d\n", __func__, rc); |
bfc0bab1 | 2007 | goto err2; |
9526f360 | 2008 | } |
c21e0bbf | 2009 | |
29b4894f MO |
2010 | /* Finally, activate the context by starting it */ |
2011 | rc = cfg->ops->start_context(hwq->ctx_cookie); | |
c21e0bbf MO |
2012 | if (unlikely(rc)) { |
2013 | dev_err(dev, "%s: start context failed rc=%d\n", __func__, rc); | |
2014 | level = UNMAP_THREE; | |
bfc0bab1 | 2015 | goto err2; |
c21e0bbf | 2016 | } |
bfc0bab1 UK |
2017 | |
2018 | out: | |
fb67d44d | 2019 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf | 2020 | return rc; |
bfc0bab1 UK |
2021 | err2: |
2022 | term_intr(cfg, level, index); | |
2023 | if (index != PRIMARY_HWQ) | |
29b4894f | 2024 | cfg->ops->release_context(ctx); |
bfc0bab1 | 2025 | err1: |
ee9f9eea | 2026 | hwq->ctx_cookie = NULL; |
bfc0bab1 | 2027 | goto out; |
c21e0bbf MO |
2028 | } |
2029 | ||
56518072 MO |
2030 | /** |
2031 | * get_num_afu_ports() - determines and configures the number of AFU ports | |
2032 | * @cfg: Internal structure associated with the host. | |
2033 | * | |
2034 | * This routine determines the number of AFU ports by converting the global | |
2035 | * port selection mask. The converted value is only valid following an AFU | |
2036 | * reset (explicit or power-on). This routine must be invoked shortly after | |
2037 | * mapping as other routines are dependent on the number of ports during the | |
2038 | * initialization sequence. | |
2039 | * | |
2040 | * To support legacy AFUs that might not have reflected an initial global | |
2041 | * port mask (value read is 0), default to the number of ports originally | |
2042 | * supported by the cxlflash driver (2) before hardware with other port | |
2043 | * offerings was introduced. | |
2044 | */ | |
2045 | static void get_num_afu_ports(struct cxlflash_cfg *cfg) | |
2046 | { | |
2047 | struct afu *afu = cfg->afu; | |
2048 | struct device *dev = &cfg->dev->dev; | |
2049 | u64 port_mask; | |
2050 | int num_fc_ports = LEGACY_FC_PORTS; | |
2051 | ||
2052 | port_mask = readq_be(&afu->afu_map->global.regs.afu_port_sel); | |
2053 | if (port_mask != 0ULL) | |
2054 | num_fc_ports = min(ilog2(port_mask) + 1, MAX_FC_PORTS); | |
2055 | ||
2056 | dev_dbg(dev, "%s: port_mask=%016llx num_fc_ports=%d\n", | |
2057 | __func__, port_mask, num_fc_ports); | |
2058 | ||
2059 | cfg->num_fc_ports = num_fc_ports; | |
2060 | cfg->host->max_channel = PORTNUM2CHAN(num_fc_ports); | |
2061 | } | |
2062 | ||
c21e0bbf MO |
2063 | /** |
2064 | * init_afu() - setup as master context and start AFU | |
1284fb0c | 2065 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
2066 | * |
2067 | * This routine is a higher level of control for configuring the | |
2068 | * AFU on probe and reset paths. | |
2069 | * | |
1284fb0c | 2070 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
2071 | */ |
2072 | static int init_afu(struct cxlflash_cfg *cfg) | |
2073 | { | |
2074 | u64 reg; | |
2075 | int rc = 0; | |
2076 | struct afu *afu = cfg->afu; | |
2077 | struct device *dev = &cfg->dev->dev; | |
bfc0bab1 UK |
2078 | struct hwq *hwq; |
2079 | int i; | |
c21e0bbf | 2080 | |
29b4894f | 2081 | cfg->ops->perst_reloads_same_image(cfg->afu_cookie, true); |
5cdac81a | 2082 | |
3065267a MO |
2083 | afu->num_hwqs = afu->desired_hwqs; |
2084 | for (i = 0; i < afu->num_hwqs; i++) { | |
bfc0bab1 UK |
2085 | rc = init_mc(cfg, i); |
2086 | if (rc) { | |
2087 | dev_err(dev, "%s: init_mc failed rc=%d index=%d\n", | |
2088 | __func__, rc, i); | |
2089 | goto err1; | |
2090 | } | |
c21e0bbf MO |
2091 | } |
2092 | ||
bfc0bab1 UK |
2093 | /* Map the entire MMIO space of the AFU using the first context */ |
2094 | hwq = get_hwq(afu, PRIMARY_HWQ); | |
29b4894f | 2095 | afu->afu_map = cfg->ops->psa_map(hwq->ctx_cookie); |
c21e0bbf | 2096 | if (!afu->afu_map) { |
29b4894f | 2097 | dev_err(dev, "%s: psa_map failed\n", __func__); |
ee3491ba | 2098 | rc = -ENOMEM; |
c21e0bbf MO |
2099 | goto err1; |
2100 | } | |
2101 | ||
e5ce067b MO |
2102 | /* No byte reverse on reading afu_version or string will be backwards */ |
2103 | reg = readq(&afu->afu_map->global.regs.afu_version); | |
2104 | memcpy(afu->version, ®, sizeof(reg)); | |
c21e0bbf MO |
2105 | afu->interface_version = |
2106 | readq_be(&afu->afu_map->global.regs.interface_version); | |
e5ce067b | 2107 | if ((afu->interface_version + 1) == 0) { |
fb67d44d MO |
2108 | dev_err(dev, "Back level AFU, please upgrade. AFU version %s " |
2109 | "interface version %016llx\n", afu->version, | |
e5ce067b MO |
2110 | afu->interface_version); |
2111 | rc = -EINVAL; | |
0df5bef7 | 2112 | goto err1; |
ee3491ba MO |
2113 | } |
2114 | ||
696d0b0c MO |
2115 | if (afu_is_sq_cmd_mode(afu)) { |
2116 | afu->send_cmd = send_cmd_sq; | |
2117 | afu->context_reset = context_reset_sq; | |
2118 | } else { | |
2119 | afu->send_cmd = send_cmd_ioarrin; | |
2120 | afu->context_reset = context_reset_ioarrin; | |
2121 | } | |
48b4be36 | 2122 | |
fb67d44d MO |
2123 | dev_dbg(dev, "%s: afu_ver=%s interface_ver=%016llx\n", __func__, |
2124 | afu->version, afu->interface_version); | |
c21e0bbf | 2125 | |
56518072 MO |
2126 | get_num_afu_ports(cfg); |
2127 | ||
c21e0bbf MO |
2128 | rc = start_afu(cfg); |
2129 | if (rc) { | |
fb67d44d | 2130 | dev_err(dev, "%s: start_afu failed, rc=%d\n", __func__, rc); |
0df5bef7 | 2131 | goto err1; |
c21e0bbf MO |
2132 | } |
2133 | ||
2134 | afu_err_intr_init(cfg->afu); | |
3065267a | 2135 | for (i = 0; i < afu->num_hwqs; i++) { |
bfc0bab1 UK |
2136 | hwq = get_hwq(afu, i); |
2137 | ||
bfc0bab1 UK |
2138 | hwq->room = readq_be(&hwq->host_map->cmd_room); |
2139 | } | |
c21e0bbf | 2140 | |
2cb79266 MO |
2141 | /* Restore the LUN mappings */ |
2142 | cxlflash_restore_luntable(cfg); | |
ee3491ba | 2143 | out: |
fb67d44d | 2144 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf | 2145 | return rc; |
ee3491ba | 2146 | |
ee3491ba | 2147 | err1: |
3065267a | 2148 | for (i = afu->num_hwqs - 1; i >= 0; i--) { |
bfc0bab1 UK |
2149 | term_intr(cfg, UNMAP_THREE, i); |
2150 | term_mc(cfg, i); | |
2151 | } | |
ee3491ba | 2152 | goto out; |
c21e0bbf MO |
2153 | } |
2154 | ||
0b09e711 UK |
2155 | /** |
2156 | * afu_reset() - resets the AFU | |
2157 | * @cfg: Internal structure associated with the host. | |
2158 | * | |
2159 | * Return: 0 on success, -errno on failure | |
2160 | */ | |
2161 | static int afu_reset(struct cxlflash_cfg *cfg) | |
2162 | { | |
2163 | struct device *dev = &cfg->dev->dev; | |
2164 | int rc = 0; | |
2165 | ||
2166 | /* Stop the context before the reset. Since the context is | |
2167 | * no longer available restart it after the reset is complete | |
2168 | */ | |
2169 | term_afu(cfg); | |
2170 | ||
2171 | rc = init_afu(cfg); | |
2172 | ||
2173 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); | |
2174 | return rc; | |
2175 | } | |
2176 | ||
2177 | /** | |
2178 | * drain_ioctls() - wait until all currently executing ioctls have completed | |
2179 | * @cfg: Internal structure associated with the host. | |
2180 | * | |
2181 | * Obtain write access to read/write semaphore that wraps ioctl | |
2182 | * handling to 'drain' ioctls currently executing. | |
2183 | */ | |
2184 | static void drain_ioctls(struct cxlflash_cfg *cfg) | |
2185 | { | |
2186 | down_write(&cfg->ioctl_rwsem); | |
2187 | up_write(&cfg->ioctl_rwsem); | |
2188 | } | |
2189 | ||
2190 | /** | |
2191 | * cxlflash_async_reset_host() - asynchronous host reset handler | |
2192 | * @data: Private data provided while scheduling reset. | |
2193 | * @cookie: Cookie that can be used for checkpointing. | |
2194 | */ | |
2195 | static void cxlflash_async_reset_host(void *data, async_cookie_t cookie) | |
2196 | { | |
2197 | struct cxlflash_cfg *cfg = data; | |
2198 | struct device *dev = &cfg->dev->dev; | |
2199 | int rc = 0; | |
2200 | ||
2201 | if (cfg->state != STATE_RESET) { | |
2202 | dev_dbg(dev, "%s: Not performing a reset, state=%d\n", | |
2203 | __func__, cfg->state); | |
2204 | goto out; | |
2205 | } | |
2206 | ||
2207 | drain_ioctls(cfg); | |
2208 | cxlflash_mark_contexts_error(cfg); | |
2209 | rc = afu_reset(cfg); | |
2210 | if (rc) | |
2211 | cfg->state = STATE_FAILTERM; | |
2212 | else | |
2213 | cfg->state = STATE_NORMAL; | |
2214 | wake_up_all(&cfg->reset_waitq); | |
2215 | ||
2216 | out: | |
2217 | scsi_unblock_requests(cfg->host); | |
2218 | } | |
2219 | ||
2220 | /** | |
2221 | * cxlflash_schedule_async_reset() - schedule an asynchronous host reset | |
2222 | * @cfg: Internal structure associated with the host. | |
2223 | */ | |
2224 | static void cxlflash_schedule_async_reset(struct cxlflash_cfg *cfg) | |
2225 | { | |
2226 | struct device *dev = &cfg->dev->dev; | |
2227 | ||
2228 | if (cfg->state != STATE_NORMAL) { | |
2229 | dev_dbg(dev, "%s: Not performing reset state=%d\n", | |
2230 | __func__, cfg->state); | |
2231 | return; | |
2232 | } | |
2233 | ||
2234 | cfg->state = STATE_RESET; | |
2235 | scsi_block_requests(cfg->host); | |
2236 | cfg->async_reset_cookie = async_schedule(cxlflash_async_reset_host, | |
2237 | cfg); | |
2238 | } | |
2239 | ||
c21e0bbf | 2240 | /** |
cf243027 | 2241 | * send_afu_cmd() - builds and sends an internal AFU command |
c21e0bbf | 2242 | * @afu: AFU associated with the host. |
cf243027 | 2243 | * @rcb: Pre-populated IOARCB describing command to send. |
c21e0bbf | 2244 | * |
cf243027 MO |
2245 | * The AFU can only take one internal AFU command at a time. This limitation is |
2246 | * enforced by using a mutex to provide exclusive access to the AFU during the | |
2247 | * operation. This design point requires calling threads to not be on interrupt | |
2248 | * context due to the possibility of sleeping during concurrent AFU operations. | |
c21e0bbf | 2249 | * |
cf243027 MO |
2250 | * The command status is optionally passed back to the caller when the caller |
2251 | * populates the IOASA field of the IOARCB with a pointer to an IOASA structure. | |
5cdac81a | 2252 | * |
c21e0bbf | 2253 | * Return: |
539d890c | 2254 | * 0 on success, -errno on failure |
c21e0bbf | 2255 | */ |
cf243027 | 2256 | static int send_afu_cmd(struct afu *afu, struct sisl_ioarcb *rcb) |
c21e0bbf | 2257 | { |
5cdac81a | 2258 | struct cxlflash_cfg *cfg = afu->parent; |
4392ba49 | 2259 | struct device *dev = &cfg->dev->dev; |
c21e0bbf | 2260 | struct afu_cmd *cmd = NULL; |
bfc0bab1 | 2261 | struct hwq *hwq = get_hwq(afu, PRIMARY_HWQ); |
350bb478 | 2262 | char *buf = NULL; |
c21e0bbf | 2263 | int rc = 0; |
a96851d3 | 2264 | int nretry = 0; |
c21e0bbf MO |
2265 | static DEFINE_MUTEX(sync_active); |
2266 | ||
5cdac81a | 2267 | if (cfg->state != STATE_NORMAL) { |
fb67d44d MO |
2268 | dev_dbg(dev, "%s: Sync not required state=%u\n", |
2269 | __func__, cfg->state); | |
5cdac81a MO |
2270 | return 0; |
2271 | } | |
2272 | ||
c21e0bbf | 2273 | mutex_lock(&sync_active); |
de01283b | 2274 | atomic_inc(&afu->cmds_active); |
a1ea04b3 | 2275 | buf = kmalloc(sizeof(*cmd) + __alignof__(*cmd) - 1, GFP_KERNEL); |
350bb478 MO |
2276 | if (unlikely(!buf)) { |
2277 | dev_err(dev, "%s: no memory for command\n", __func__); | |
539d890c | 2278 | rc = -ENOMEM; |
c21e0bbf MO |
2279 | goto out; |
2280 | } | |
2281 | ||
350bb478 | 2282 | cmd = (struct afu_cmd *)PTR_ALIGN(buf, __alignof__(*cmd)); |
a96851d3 UK |
2283 | |
2284 | retry: | |
a1ea04b3 | 2285 | memset(cmd, 0, sizeof(*cmd)); |
cf243027 | 2286 | memcpy(&cmd->rcb, rcb, sizeof(*rcb)); |
a1ea04b3 | 2287 | INIT_LIST_HEAD(&cmd->queue); |
350bb478 | 2288 | init_completion(&cmd->cevent); |
350bb478 | 2289 | cmd->parent = afu; |
bfc0bab1 | 2290 | cmd->hwq_index = hwq->index; |
bfc0bab1 | 2291 | cmd->rcb.ctx_id = hwq->ctx_hndl; |
c21e0bbf | 2292 | |
cf243027 MO |
2293 | dev_dbg(dev, "%s: afu=%p cmd=%p type=%02x nretry=%d\n", |
2294 | __func__, afu, cmd, cmd->rcb.cdb[0], nretry); | |
c21e0bbf | 2295 | |
48b4be36 | 2296 | rc = afu->send_cmd(afu, cmd); |
539d890c UK |
2297 | if (unlikely(rc)) { |
2298 | rc = -ENOBUFS; | |
c21e0bbf | 2299 | goto out; |
539d890c | 2300 | } |
c21e0bbf | 2301 | |
9ba848ac | 2302 | rc = wait_resp(afu, cmd); |
a1ea04b3 UK |
2303 | switch (rc) { |
2304 | case -ETIMEDOUT: | |
a96851d3 | 2305 | rc = afu->context_reset(hwq); |
a1ea04b3 UK |
2306 | if (rc) { |
2307 | cxlflash_schedule_async_reset(cfg); | |
2308 | break; | |
2309 | } | |
2310 | /* fall through to retry */ | |
2311 | case -EAGAIN: | |
2312 | if (++nretry < 2) | |
a96851d3 | 2313 | goto retry; |
a1ea04b3 UK |
2314 | /* fall through to exit */ |
2315 | default: | |
2316 | break; | |
a96851d3 UK |
2317 | } |
2318 | ||
cf243027 MO |
2319 | if (rcb->ioasa) |
2320 | *rcb->ioasa = cmd->sa; | |
c21e0bbf | 2321 | out: |
de01283b | 2322 | atomic_dec(&afu->cmds_active); |
c21e0bbf | 2323 | mutex_unlock(&sync_active); |
350bb478 | 2324 | kfree(buf); |
fb67d44d | 2325 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf MO |
2326 | return rc; |
2327 | } | |
2328 | ||
cf243027 MO |
2329 | /** |
2330 | * cxlflash_afu_sync() - builds and sends an AFU sync command | |
2331 | * @afu: AFU associated with the host. | |
2332 | * @ctx: Identifies context requesting sync. | |
2333 | * @res: Identifies resource requesting sync. | |
2334 | * @mode: Type of sync to issue (lightweight, heavyweight, global). | |
2335 | * | |
2336 | * AFU sync operations are only necessary and allowed when the device is | |
2337 | * operating normally. When not operating normally, sync requests can occur as | |
2338 | * part of cleaning up resources associated with an adapter prior to removal. | |
2339 | * In this scenario, these requests are simply ignored (safe due to the AFU | |
2340 | * going away). | |
2341 | * | |
2342 | * Return: | |
2343 | * 0 on success, -errno on failure | |
2344 | */ | |
2345 | int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t ctx, res_hndl_t res, u8 mode) | |
2346 | { | |
2347 | struct cxlflash_cfg *cfg = afu->parent; | |
2348 | struct device *dev = &cfg->dev->dev; | |
2349 | struct sisl_ioarcb rcb = { 0 }; | |
2350 | ||
2351 | dev_dbg(dev, "%s: afu=%p ctx=%u res=%u mode=%u\n", | |
2352 | __func__, afu, ctx, res, mode); | |
2353 | ||
2354 | rcb.req_flags = SISL_REQ_FLAGS_AFU_CMD; | |
2355 | rcb.msi = SISL_MSI_RRQ_UPDATED; | |
2356 | rcb.timeout = MC_AFU_SYNC_TIMEOUT; | |
2357 | ||
2358 | rcb.cdb[0] = SISL_AFU_CMD_SYNC; | |
2359 | rcb.cdb[1] = mode; | |
2360 | put_unaligned_be16(ctx, &rcb.cdb[2]); | |
2361 | put_unaligned_be32(res, &rcb.cdb[4]); | |
2362 | ||
2363 | return send_afu_cmd(afu, &rcb); | |
2364 | } | |
2365 | ||
7c4c41f1 UK |
2366 | /** |
2367 | * cxlflash_eh_abort_handler() - abort a SCSI command | |
2368 | * @scp: SCSI command to abort. | |
2369 | * | |
2370 | * CXL Flash devices do not support a single command abort. Reset the context | |
2371 | * as per SISLite specification. Flush any pending commands in the hardware | |
2372 | * queue before the reset. | |
2373 | * | |
2374 | * Return: SUCCESS/FAILED as defined in scsi/scsi.h | |
2375 | */ | |
2376 | static int cxlflash_eh_abort_handler(struct scsi_cmnd *scp) | |
2377 | { | |
2378 | int rc = FAILED; | |
2379 | struct Scsi_Host *host = scp->device->host; | |
2380 | struct cxlflash_cfg *cfg = shost_priv(host); | |
2381 | struct afu_cmd *cmd = sc_to_afuc(scp); | |
2382 | struct device *dev = &cfg->dev->dev; | |
2383 | struct afu *afu = cfg->afu; | |
2384 | struct hwq *hwq = get_hwq(afu, cmd->hwq_index); | |
2385 | ||
2386 | dev_dbg(dev, "%s: (scp=%p) %d/%d/%d/%llu " | |
2387 | "cdb=(%08x-%08x-%08x-%08x)\n", __func__, scp, host->host_no, | |
2388 | scp->device->channel, scp->device->id, scp->device->lun, | |
2389 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
2390 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
2391 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
2392 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
2393 | ||
2394 | /* When the state is not normal, another reset/reload is in progress. | |
2395 | * Return failed and the mid-layer will invoke host reset handler. | |
2396 | */ | |
2397 | if (cfg->state != STATE_NORMAL) { | |
2398 | dev_dbg(dev, "%s: Invalid state for abort, state=%d\n", | |
2399 | __func__, cfg->state); | |
2400 | goto out; | |
2401 | } | |
2402 | ||
2403 | rc = afu->context_reset(hwq); | |
2404 | if (unlikely(rc)) | |
2405 | goto out; | |
2406 | ||
2407 | rc = SUCCESS; | |
2408 | ||
2409 | out: | |
2410 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); | |
2411 | return rc; | |
2412 | } | |
2413 | ||
15305514 MO |
2414 | /** |
2415 | * cxlflash_eh_device_reset_handler() - reset a single LUN | |
2416 | * @scp: SCSI command to send. | |
2417 | * | |
2418 | * Return: | |
2419 | * SUCCESS as defined in scsi/scsi.h | |
2420 | * FAILED as defined in scsi/scsi.h | |
2421 | */ | |
2422 | static int cxlflash_eh_device_reset_handler(struct scsi_cmnd *scp) | |
2423 | { | |
2424 | int rc = SUCCESS; | |
32abbeda MO |
2425 | struct scsi_device *sdev = scp->device; |
2426 | struct Scsi_Host *host = sdev->host; | |
fb67d44d MO |
2427 | struct cxlflash_cfg *cfg = shost_priv(host); |
2428 | struct device *dev = &cfg->dev->dev; | |
15305514 MO |
2429 | int rcr = 0; |
2430 | ||
5a4d9d77 MO |
2431 | dev_dbg(dev, "%s: %d/%d/%d/%llu\n", __func__, |
2432 | host->host_no, sdev->channel, sdev->id, sdev->lun); | |
ed486daa | 2433 | retry: |
15305514 MO |
2434 | switch (cfg->state) { |
2435 | case STATE_NORMAL: | |
32abbeda | 2436 | rcr = send_tmf(cfg, sdev, TMF_LUN_RESET); |
15305514 MO |
2437 | if (unlikely(rcr)) |
2438 | rc = FAILED; | |
2439 | break; | |
2440 | case STATE_RESET: | |
2441 | wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); | |
ed486daa | 2442 | goto retry; |
15305514 MO |
2443 | default: |
2444 | rc = FAILED; | |
2445 | break; | |
2446 | } | |
2447 | ||
fb67d44d | 2448 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
15305514 MO |
2449 | return rc; |
2450 | } | |
2451 | ||
2452 | /** | |
2453 | * cxlflash_eh_host_reset_handler() - reset the host adapter | |
2454 | * @scp: SCSI command from stack identifying host. | |
2455 | * | |
1d3324c3 MO |
2456 | * Following a reset, the state is evaluated again in case an EEH occurred |
2457 | * during the reset. In such a scenario, the host reset will either yield | |
2458 | * until the EEH recovery is complete or return success or failure based | |
2459 | * upon the current device state. | |
2460 | * | |
15305514 MO |
2461 | * Return: |
2462 | * SUCCESS as defined in scsi/scsi.h | |
2463 | * FAILED as defined in scsi/scsi.h | |
2464 | */ | |
2465 | static int cxlflash_eh_host_reset_handler(struct scsi_cmnd *scp) | |
2466 | { | |
2467 | int rc = SUCCESS; | |
2468 | int rcr = 0; | |
2469 | struct Scsi_Host *host = scp->device->host; | |
fb67d44d MO |
2470 | struct cxlflash_cfg *cfg = shost_priv(host); |
2471 | struct device *dev = &cfg->dev->dev; | |
15305514 | 2472 | |
5a4d9d77 | 2473 | dev_dbg(dev, "%s: %d\n", __func__, host->host_no); |
15305514 MO |
2474 | |
2475 | switch (cfg->state) { | |
2476 | case STATE_NORMAL: | |
2477 | cfg->state = STATE_RESET; | |
f411396d | 2478 | drain_ioctls(cfg); |
15305514 MO |
2479 | cxlflash_mark_contexts_error(cfg); |
2480 | rcr = afu_reset(cfg); | |
2481 | if (rcr) { | |
2482 | rc = FAILED; | |
2483 | cfg->state = STATE_FAILTERM; | |
2484 | } else | |
2485 | cfg->state = STATE_NORMAL; | |
2486 | wake_up_all(&cfg->reset_waitq); | |
1d3324c3 MO |
2487 | ssleep(1); |
2488 | /* fall through */ | |
15305514 MO |
2489 | case STATE_RESET: |
2490 | wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); | |
2491 | if (cfg->state == STATE_NORMAL) | |
2492 | break; | |
2493 | /* fall through */ | |
2494 | default: | |
2495 | rc = FAILED; | |
2496 | break; | |
2497 | } | |
2498 | ||
fb67d44d | 2499 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
15305514 MO |
2500 | return rc; |
2501 | } | |
2502 | ||
2503 | /** | |
2504 | * cxlflash_change_queue_depth() - change the queue depth for the device | |
2505 | * @sdev: SCSI device destined for queue depth change. | |
2506 | * @qdepth: Requested queue depth value to set. | |
2507 | * | |
2508 | * The requested queue depth is capped to the maximum supported value. | |
2509 | * | |
2510 | * Return: The actual queue depth set. | |
2511 | */ | |
2512 | static int cxlflash_change_queue_depth(struct scsi_device *sdev, int qdepth) | |
2513 | { | |
2514 | ||
2515 | if (qdepth > CXLFLASH_MAX_CMDS_PER_LUN) | |
2516 | qdepth = CXLFLASH_MAX_CMDS_PER_LUN; | |
2517 | ||
2518 | scsi_change_queue_depth(sdev, qdepth); | |
2519 | return sdev->queue_depth; | |
2520 | } | |
2521 | ||
2522 | /** | |
2523 | * cxlflash_show_port_status() - queries and presents the current port status | |
e0f01a21 | 2524 | * @port: Desired port for status reporting. |
3b225cd3 | 2525 | * @cfg: Internal structure associated with the host. |
15305514 MO |
2526 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. |
2527 | * | |
78ae028e | 2528 | * Return: The size of the ASCII string returned in @buf or -EINVAL. |
15305514 | 2529 | */ |
3b225cd3 MO |
2530 | static ssize_t cxlflash_show_port_status(u32 port, |
2531 | struct cxlflash_cfg *cfg, | |
2532 | char *buf) | |
15305514 | 2533 | { |
78ae028e | 2534 | struct device *dev = &cfg->dev->dev; |
15305514 | 2535 | char *disp_status; |
15305514 | 2536 | u64 status; |
0aa14887 | 2537 | __be64 __iomem *fc_port_regs; |
15305514 | 2538 | |
78ae028e MO |
2539 | WARN_ON(port >= MAX_FC_PORTS); |
2540 | ||
2541 | if (port >= cfg->num_fc_ports) { | |
2542 | dev_info(dev, "%s: Port %d not supported on this card.\n", | |
2543 | __func__, port); | |
2544 | return -EINVAL; | |
2545 | } | |
15305514 | 2546 | |
0aa14887 MO |
2547 | fc_port_regs = get_fc_port_regs(cfg, port); |
2548 | status = readq_be(&fc_port_regs[FC_MTIP_STATUS / 8]); | |
e0f01a21 | 2549 | status &= FC_MTIP_STATUS_MASK; |
15305514 MO |
2550 | |
2551 | if (status == FC_MTIP_STATUS_ONLINE) | |
2552 | disp_status = "online"; | |
2553 | else if (status == FC_MTIP_STATUS_OFFLINE) | |
2554 | disp_status = "offline"; | |
2555 | else | |
2556 | disp_status = "unknown"; | |
2557 | ||
e0f01a21 MO |
2558 | return scnprintf(buf, PAGE_SIZE, "%s\n", disp_status); |
2559 | } | |
2560 | ||
2561 | /** | |
2562 | * port0_show() - queries and presents the current status of port 0 | |
2563 | * @dev: Generic device associated with the host owning the port. | |
2564 | * @attr: Device attribute representing the port. | |
2565 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2566 | * | |
2567 | * Return: The size of the ASCII string returned in @buf. | |
2568 | */ | |
2569 | static ssize_t port0_show(struct device *dev, | |
2570 | struct device_attribute *attr, | |
2571 | char *buf) | |
2572 | { | |
fb67d44d | 2573 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); |
e0f01a21 | 2574 | |
3b225cd3 | 2575 | return cxlflash_show_port_status(0, cfg, buf); |
15305514 MO |
2576 | } |
2577 | ||
2578 | /** | |
e0f01a21 MO |
2579 | * port1_show() - queries and presents the current status of port 1 |
2580 | * @dev: Generic device associated with the host owning the port. | |
2581 | * @attr: Device attribute representing the port. | |
2582 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2583 | * | |
2584 | * Return: The size of the ASCII string returned in @buf. | |
2585 | */ | |
2586 | static ssize_t port1_show(struct device *dev, | |
2587 | struct device_attribute *attr, | |
2588 | char *buf) | |
2589 | { | |
fb67d44d | 2590 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); |
e0f01a21 | 2591 | |
3b225cd3 | 2592 | return cxlflash_show_port_status(1, cfg, buf); |
e0f01a21 MO |
2593 | } |
2594 | ||
1cd7fabc MO |
2595 | /** |
2596 | * port2_show() - queries and presents the current status of port 2 | |
2597 | * @dev: Generic device associated with the host owning the port. | |
2598 | * @attr: Device attribute representing the port. | |
2599 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2600 | * | |
2601 | * Return: The size of the ASCII string returned in @buf. | |
2602 | */ | |
2603 | static ssize_t port2_show(struct device *dev, | |
2604 | struct device_attribute *attr, | |
2605 | char *buf) | |
2606 | { | |
2607 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); | |
2608 | ||
2609 | return cxlflash_show_port_status(2, cfg, buf); | |
2610 | } | |
2611 | ||
2612 | /** | |
2613 | * port3_show() - queries and presents the current status of port 3 | |
2614 | * @dev: Generic device associated with the host owning the port. | |
2615 | * @attr: Device attribute representing the port. | |
2616 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2617 | * | |
2618 | * Return: The size of the ASCII string returned in @buf. | |
2619 | */ | |
2620 | static ssize_t port3_show(struct device *dev, | |
2621 | struct device_attribute *attr, | |
2622 | char *buf) | |
2623 | { | |
2624 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); | |
2625 | ||
2626 | return cxlflash_show_port_status(3, cfg, buf); | |
2627 | } | |
2628 | ||
e0f01a21 MO |
2629 | /** |
2630 | * lun_mode_show() - presents the current LUN mode of the host | |
15305514 | 2631 | * @dev: Generic device associated with the host. |
e0f01a21 | 2632 | * @attr: Device attribute representing the LUN mode. |
15305514 MO |
2633 | * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII. |
2634 | * | |
2635 | * Return: The size of the ASCII string returned in @buf. | |
2636 | */ | |
e0f01a21 MO |
2637 | static ssize_t lun_mode_show(struct device *dev, |
2638 | struct device_attribute *attr, char *buf) | |
15305514 | 2639 | { |
fb67d44d | 2640 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); |
15305514 MO |
2641 | struct afu *afu = cfg->afu; |
2642 | ||
e0f01a21 | 2643 | return scnprintf(buf, PAGE_SIZE, "%u\n", afu->internal_lun); |
15305514 MO |
2644 | } |
2645 | ||
2646 | /** | |
e0f01a21 | 2647 | * lun_mode_store() - sets the LUN mode of the host |
15305514 | 2648 | * @dev: Generic device associated with the host. |
e0f01a21 | 2649 | * @attr: Device attribute representing the LUN mode. |
15305514 MO |
2650 | * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII. |
2651 | * @count: Length of data resizing in @buf. | |
2652 | * | |
2653 | * The CXL Flash AFU supports a dummy LUN mode where the external | |
2654 | * links and storage are not required. Space on the FPGA is used | |
2655 | * to create 1 or 2 small LUNs which are presented to the system | |
2656 | * as if they were a normal storage device. This feature is useful | |
2657 | * during development and also provides manufacturing with a way | |
2658 | * to test the AFU without an actual device. | |
2659 | * | |
2660 | * 0 = external LUN[s] (default) | |
2661 | * 1 = internal LUN (1 x 64K, 512B blocks, id 0) | |
2662 | * 2 = internal LUN (1 x 64K, 4K blocks, id 0) | |
2663 | * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1) | |
2664 | * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1) | |
2665 | * | |
2666 | * Return: The size of the ASCII string returned in @buf. | |
2667 | */ | |
e0f01a21 MO |
2668 | static ssize_t lun_mode_store(struct device *dev, |
2669 | struct device_attribute *attr, | |
2670 | const char *buf, size_t count) | |
15305514 MO |
2671 | { |
2672 | struct Scsi_Host *shost = class_to_shost(dev); | |
fb67d44d | 2673 | struct cxlflash_cfg *cfg = shost_priv(shost); |
15305514 MO |
2674 | struct afu *afu = cfg->afu; |
2675 | int rc; | |
2676 | u32 lun_mode; | |
2677 | ||
2678 | rc = kstrtouint(buf, 10, &lun_mode); | |
2679 | if (!rc && (lun_mode < 5) && (lun_mode != afu->internal_lun)) { | |
2680 | afu->internal_lun = lun_mode; | |
603ecce9 MK |
2681 | |
2682 | /* | |
2683 | * When configured for internal LUN, there is only one channel, | |
78ae028e MO |
2684 | * channel number 0, else there will be one less than the number |
2685 | * of fc ports for this card. | |
603ecce9 MK |
2686 | */ |
2687 | if (afu->internal_lun) | |
2688 | shost->max_channel = 0; | |
2689 | else | |
8fa4f177 | 2690 | shost->max_channel = PORTNUM2CHAN(cfg->num_fc_ports); |
603ecce9 | 2691 | |
15305514 MO |
2692 | afu_reset(cfg); |
2693 | scsi_scan_host(cfg->host); | |
2694 | } | |
2695 | ||
2696 | return count; | |
2697 | } | |
2698 | ||
2699 | /** | |
e0f01a21 | 2700 | * ioctl_version_show() - presents the current ioctl version of the host |
15305514 MO |
2701 | * @dev: Generic device associated with the host. |
2702 | * @attr: Device attribute representing the ioctl version. | |
2703 | * @buf: Buffer of length PAGE_SIZE to report back the ioctl version. | |
2704 | * | |
2705 | * Return: The size of the ASCII string returned in @buf. | |
2706 | */ | |
e0f01a21 MO |
2707 | static ssize_t ioctl_version_show(struct device *dev, |
2708 | struct device_attribute *attr, char *buf) | |
15305514 | 2709 | { |
d6e32f53 MO |
2710 | ssize_t bytes = 0; |
2711 | ||
2712 | bytes = scnprintf(buf, PAGE_SIZE, | |
2713 | "disk: %u\n", DK_CXLFLASH_VERSION_0); | |
2714 | bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes, | |
2715 | "host: %u\n", HT_CXLFLASH_VERSION_0); | |
2716 | ||
2717 | return bytes; | |
15305514 MO |
2718 | } |
2719 | ||
2720 | /** | |
e0f01a21 MO |
2721 | * cxlflash_show_port_lun_table() - queries and presents the port LUN table |
2722 | * @port: Desired port for status reporting. | |
3b225cd3 | 2723 | * @cfg: Internal structure associated with the host. |
e0f01a21 MO |
2724 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. |
2725 | * | |
78ae028e | 2726 | * Return: The size of the ASCII string returned in @buf or -EINVAL. |
e0f01a21 MO |
2727 | */ |
2728 | static ssize_t cxlflash_show_port_lun_table(u32 port, | |
3b225cd3 | 2729 | struct cxlflash_cfg *cfg, |
e0f01a21 MO |
2730 | char *buf) |
2731 | { | |
78ae028e | 2732 | struct device *dev = &cfg->dev->dev; |
0aa14887 | 2733 | __be64 __iomem *fc_port_luns; |
e0f01a21 MO |
2734 | int i; |
2735 | ssize_t bytes = 0; | |
e0f01a21 | 2736 | |
78ae028e MO |
2737 | WARN_ON(port >= MAX_FC_PORTS); |
2738 | ||
2739 | if (port >= cfg->num_fc_ports) { | |
2740 | dev_info(dev, "%s: Port %d not supported on this card.\n", | |
2741 | __func__, port); | |
2742 | return -EINVAL; | |
2743 | } | |
e0f01a21 | 2744 | |
0aa14887 | 2745 | fc_port_luns = get_fc_port_luns(cfg, port); |
e0f01a21 MO |
2746 | |
2747 | for (i = 0; i < CXLFLASH_NUM_VLUNS; i++) | |
2748 | bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes, | |
0aa14887 MO |
2749 | "%03d: %016llx\n", |
2750 | i, readq_be(&fc_port_luns[i])); | |
e0f01a21 MO |
2751 | return bytes; |
2752 | } | |
2753 | ||
2754 | /** | |
2755 | * port0_lun_table_show() - presents the current LUN table of port 0 | |
2756 | * @dev: Generic device associated with the host owning the port. | |
2757 | * @attr: Device attribute representing the port. | |
2758 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2759 | * | |
2760 | * Return: The size of the ASCII string returned in @buf. | |
2761 | */ | |
2762 | static ssize_t port0_lun_table_show(struct device *dev, | |
2763 | struct device_attribute *attr, | |
2764 | char *buf) | |
2765 | { | |
fb67d44d | 2766 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); |
e0f01a21 | 2767 | |
3b225cd3 | 2768 | return cxlflash_show_port_lun_table(0, cfg, buf); |
e0f01a21 MO |
2769 | } |
2770 | ||
2771 | /** | |
2772 | * port1_lun_table_show() - presents the current LUN table of port 1 | |
2773 | * @dev: Generic device associated with the host owning the port. | |
2774 | * @attr: Device attribute representing the port. | |
2775 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2776 | * | |
2777 | * Return: The size of the ASCII string returned in @buf. | |
2778 | */ | |
2779 | static ssize_t port1_lun_table_show(struct device *dev, | |
2780 | struct device_attribute *attr, | |
2781 | char *buf) | |
2782 | { | |
fb67d44d | 2783 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); |
e0f01a21 | 2784 | |
3b225cd3 | 2785 | return cxlflash_show_port_lun_table(1, cfg, buf); |
e0f01a21 MO |
2786 | } |
2787 | ||
1cd7fabc MO |
2788 | /** |
2789 | * port2_lun_table_show() - presents the current LUN table of port 2 | |
2790 | * @dev: Generic device associated with the host owning the port. | |
2791 | * @attr: Device attribute representing the port. | |
2792 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2793 | * | |
2794 | * Return: The size of the ASCII string returned in @buf. | |
2795 | */ | |
2796 | static ssize_t port2_lun_table_show(struct device *dev, | |
2797 | struct device_attribute *attr, | |
2798 | char *buf) | |
2799 | { | |
2800 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); | |
2801 | ||
2802 | return cxlflash_show_port_lun_table(2, cfg, buf); | |
2803 | } | |
2804 | ||
2805 | /** | |
2806 | * port3_lun_table_show() - presents the current LUN table of port 3 | |
2807 | * @dev: Generic device associated with the host owning the port. | |
2808 | * @attr: Device attribute representing the port. | |
2809 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2810 | * | |
2811 | * Return: The size of the ASCII string returned in @buf. | |
2812 | */ | |
2813 | static ssize_t port3_lun_table_show(struct device *dev, | |
2814 | struct device_attribute *attr, | |
2815 | char *buf) | |
2816 | { | |
2817 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); | |
2818 | ||
2819 | return cxlflash_show_port_lun_table(3, cfg, buf); | |
2820 | } | |
2821 | ||
cba06e6d MO |
2822 | /** |
2823 | * irqpoll_weight_show() - presents the current IRQ poll weight for the host | |
2824 | * @dev: Generic device associated with the host. | |
2825 | * @attr: Device attribute representing the IRQ poll weight. | |
2826 | * @buf: Buffer of length PAGE_SIZE to report back the current IRQ poll | |
2827 | * weight in ASCII. | |
2828 | * | |
2829 | * An IRQ poll weight of 0 indicates polling is disabled. | |
2830 | * | |
2831 | * Return: The size of the ASCII string returned in @buf. | |
2832 | */ | |
2833 | static ssize_t irqpoll_weight_show(struct device *dev, | |
2834 | struct device_attribute *attr, char *buf) | |
2835 | { | |
2836 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); | |
2837 | struct afu *afu = cfg->afu; | |
2838 | ||
2839 | return scnprintf(buf, PAGE_SIZE, "%u\n", afu->irqpoll_weight); | |
2840 | } | |
2841 | ||
2842 | /** | |
2843 | * irqpoll_weight_store() - sets the current IRQ poll weight for the host | |
2844 | * @dev: Generic device associated with the host. | |
2845 | * @attr: Device attribute representing the IRQ poll weight. | |
2846 | * @buf: Buffer of length PAGE_SIZE containing the desired IRQ poll | |
2847 | * weight in ASCII. | |
2848 | * @count: Length of data resizing in @buf. | |
2849 | * | |
2850 | * An IRQ poll weight of 0 indicates polling is disabled. | |
2851 | * | |
2852 | * Return: The size of the ASCII string returned in @buf. | |
2853 | */ | |
2854 | static ssize_t irqpoll_weight_store(struct device *dev, | |
2855 | struct device_attribute *attr, | |
2856 | const char *buf, size_t count) | |
2857 | { | |
2858 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); | |
2859 | struct device *cfgdev = &cfg->dev->dev; | |
2860 | struct afu *afu = cfg->afu; | |
bfc0bab1 | 2861 | struct hwq *hwq; |
cba06e6d | 2862 | u32 weight; |
bfc0bab1 | 2863 | int rc, i; |
cba06e6d MO |
2864 | |
2865 | rc = kstrtouint(buf, 10, &weight); | |
2866 | if (rc) | |
2867 | return -EINVAL; | |
2868 | ||
2869 | if (weight > 256) { | |
2870 | dev_info(cfgdev, | |
2871 | "Invalid IRQ poll weight. It must be 256 or less.\n"); | |
2872 | return -EINVAL; | |
2873 | } | |
2874 | ||
2875 | if (weight == afu->irqpoll_weight) { | |
2876 | dev_info(cfgdev, | |
2877 | "Current IRQ poll weight has the same weight.\n"); | |
2878 | return -EINVAL; | |
2879 | } | |
2880 | ||
bfc0bab1 | 2881 | if (afu_is_irqpoll_enabled(afu)) { |
3065267a | 2882 | for (i = 0; i < afu->num_hwqs; i++) { |
bfc0bab1 UK |
2883 | hwq = get_hwq(afu, i); |
2884 | ||
2885 | irq_poll_disable(&hwq->irqpoll); | |
2886 | } | |
2887 | } | |
cba06e6d MO |
2888 | |
2889 | afu->irqpoll_weight = weight; | |
2890 | ||
bfc0bab1 | 2891 | if (weight > 0) { |
3065267a | 2892 | for (i = 0; i < afu->num_hwqs; i++) { |
bfc0bab1 UK |
2893 | hwq = get_hwq(afu, i); |
2894 | ||
2895 | irq_poll_init(&hwq->irqpoll, weight, cxlflash_irqpoll); | |
2896 | } | |
2897 | } | |
cba06e6d MO |
2898 | |
2899 | return count; | |
2900 | } | |
2901 | ||
3065267a MO |
2902 | /** |
2903 | * num_hwqs_show() - presents the number of hardware queues for the host | |
2904 | * @dev: Generic device associated with the host. | |
2905 | * @attr: Device attribute representing the number of hardware queues. | |
2906 | * @buf: Buffer of length PAGE_SIZE to report back the number of hardware | |
2907 | * queues in ASCII. | |
2908 | * | |
2909 | * Return: The size of the ASCII string returned in @buf. | |
2910 | */ | |
2911 | static ssize_t num_hwqs_show(struct device *dev, | |
2912 | struct device_attribute *attr, char *buf) | |
2913 | { | |
2914 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); | |
2915 | struct afu *afu = cfg->afu; | |
2916 | ||
2917 | return scnprintf(buf, PAGE_SIZE, "%u\n", afu->num_hwqs); | |
2918 | } | |
2919 | ||
2920 | /** | |
2921 | * num_hwqs_store() - sets the number of hardware queues for the host | |
2922 | * @dev: Generic device associated with the host. | |
2923 | * @attr: Device attribute representing the number of hardware queues. | |
2924 | * @buf: Buffer of length PAGE_SIZE containing the number of hardware | |
2925 | * queues in ASCII. | |
2926 | * @count: Length of data resizing in @buf. | |
2927 | * | |
2928 | * n > 0: num_hwqs = n | |
2929 | * n = 0: num_hwqs = num_online_cpus() | |
2930 | * n < 0: num_online_cpus() / abs(n) | |
2931 | * | |
2932 | * Return: The size of the ASCII string returned in @buf. | |
2933 | */ | |
2934 | static ssize_t num_hwqs_store(struct device *dev, | |
2935 | struct device_attribute *attr, | |
2936 | const char *buf, size_t count) | |
2937 | { | |
2938 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); | |
2939 | struct afu *afu = cfg->afu; | |
2940 | int rc; | |
2941 | int nhwqs, num_hwqs; | |
2942 | ||
2943 | rc = kstrtoint(buf, 10, &nhwqs); | |
2944 | if (rc) | |
2945 | return -EINVAL; | |
2946 | ||
2947 | if (nhwqs >= 1) | |
2948 | num_hwqs = nhwqs; | |
2949 | else if (nhwqs == 0) | |
2950 | num_hwqs = num_online_cpus(); | |
2951 | else | |
2952 | num_hwqs = num_online_cpus() / abs(nhwqs); | |
2953 | ||
2954 | afu->desired_hwqs = min(num_hwqs, CXLFLASH_MAX_HWQS); | |
2955 | WARN_ON_ONCE(afu->desired_hwqs == 0); | |
2956 | ||
2957 | retry: | |
2958 | switch (cfg->state) { | |
2959 | case STATE_NORMAL: | |
2960 | cfg->state = STATE_RESET; | |
2961 | drain_ioctls(cfg); | |
2962 | cxlflash_mark_contexts_error(cfg); | |
2963 | rc = afu_reset(cfg); | |
2964 | if (rc) | |
2965 | cfg->state = STATE_FAILTERM; | |
2966 | else | |
2967 | cfg->state = STATE_NORMAL; | |
2968 | wake_up_all(&cfg->reset_waitq); | |
2969 | break; | |
2970 | case STATE_RESET: | |
2971 | wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); | |
2972 | if (cfg->state == STATE_NORMAL) | |
2973 | goto retry; | |
2974 | default: | |
2975 | /* Ideally should not happen */ | |
2976 | dev_err(dev, "%s: Device is not ready, state=%d\n", | |
2977 | __func__, cfg->state); | |
2978 | break; | |
2979 | } | |
2980 | ||
2981 | return count; | |
2982 | } | |
2983 | ||
1dd0c0e4 MO |
2984 | static const char *hwq_mode_name[MAX_HWQ_MODE] = { "rr", "tag", "cpu" }; |
2985 | ||
2986 | /** | |
2987 | * hwq_mode_show() - presents the HWQ steering mode for the host | |
2988 | * @dev: Generic device associated with the host. | |
2989 | * @attr: Device attribute representing the HWQ steering mode. | |
2990 | * @buf: Buffer of length PAGE_SIZE to report back the HWQ steering mode | |
2991 | * as a character string. | |
2992 | * | |
2993 | * Return: The size of the ASCII string returned in @buf. | |
2994 | */ | |
2995 | static ssize_t hwq_mode_show(struct device *dev, | |
2996 | struct device_attribute *attr, char *buf) | |
2997 | { | |
2998 | struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); | |
2999 | struct afu *afu = cfg->afu; | |
3000 | ||
3001 | return scnprintf(buf, PAGE_SIZE, "%s\n", hwq_mode_name[afu->hwq_mode]); | |
3002 | } | |
3003 | ||
3004 | /** | |
3005 | * hwq_mode_store() - sets the HWQ steering mode for the host | |
3006 | * @dev: Generic device associated with the host. | |
3007 | * @attr: Device attribute representing the HWQ steering mode. | |
3008 | * @buf: Buffer of length PAGE_SIZE containing the HWQ steering mode | |
3009 | * as a character string. | |
3010 | * @count: Length of data resizing in @buf. | |
3011 | * | |
3012 | * rr = Round-Robin | |
3013 | * tag = Block MQ Tagging | |
3014 | * cpu = CPU Affinity | |
3015 | * | |
3016 | * Return: The size of the ASCII string returned in @buf. | |
3017 | */ | |
3018 | static ssize_t hwq_mode_store(struct device *dev, | |
3019 | struct device_attribute *attr, | |
3020 | const char *buf, size_t count) | |
3021 | { | |
3022 | struct Scsi_Host *shost = class_to_shost(dev); | |
3023 | struct cxlflash_cfg *cfg = shost_priv(shost); | |
3024 | struct device *cfgdev = &cfg->dev->dev; | |
3025 | struct afu *afu = cfg->afu; | |
3026 | int i; | |
3027 | u32 mode = MAX_HWQ_MODE; | |
3028 | ||
3029 | for (i = 0; i < MAX_HWQ_MODE; i++) { | |
3030 | if (!strncmp(hwq_mode_name[i], buf, strlen(hwq_mode_name[i]))) { | |
3031 | mode = i; | |
3032 | break; | |
3033 | } | |
3034 | } | |
3035 | ||
3036 | if (mode >= MAX_HWQ_MODE) { | |
3037 | dev_info(cfgdev, "Invalid HWQ steering mode.\n"); | |
3038 | return -EINVAL; | |
3039 | } | |
3040 | ||
3041 | if ((mode == HWQ_MODE_TAG) && !shost_use_blk_mq(shost)) { | |
3042 | dev_info(cfgdev, "SCSI-MQ is not enabled, use a different " | |
3043 | "HWQ steering mode.\n"); | |
3044 | return -EINVAL; | |
3045 | } | |
3046 | ||
3047 | afu->hwq_mode = mode; | |
3048 | ||
3049 | return count; | |
3050 | } | |
3051 | ||
e0f01a21 MO |
3052 | /** |
3053 | * mode_show() - presents the current mode of the device | |
15305514 MO |
3054 | * @dev: Generic device associated with the device. |
3055 | * @attr: Device attribute representing the device mode. | |
3056 | * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII. | |
3057 | * | |
3058 | * Return: The size of the ASCII string returned in @buf. | |
3059 | */ | |
e0f01a21 MO |
3060 | static ssize_t mode_show(struct device *dev, |
3061 | struct device_attribute *attr, char *buf) | |
15305514 MO |
3062 | { |
3063 | struct scsi_device *sdev = to_scsi_device(dev); | |
3064 | ||
e0f01a21 MO |
3065 | return scnprintf(buf, PAGE_SIZE, "%s\n", |
3066 | sdev->hostdata ? "superpipe" : "legacy"); | |
15305514 MO |
3067 | } |
3068 | ||
3069 | /* | |
3070 | * Host attributes | |
3071 | */ | |
e0f01a21 MO |
3072 | static DEVICE_ATTR_RO(port0); |
3073 | static DEVICE_ATTR_RO(port1); | |
1cd7fabc MO |
3074 | static DEVICE_ATTR_RO(port2); |
3075 | static DEVICE_ATTR_RO(port3); | |
e0f01a21 MO |
3076 | static DEVICE_ATTR_RW(lun_mode); |
3077 | static DEVICE_ATTR_RO(ioctl_version); | |
3078 | static DEVICE_ATTR_RO(port0_lun_table); | |
3079 | static DEVICE_ATTR_RO(port1_lun_table); | |
1cd7fabc MO |
3080 | static DEVICE_ATTR_RO(port2_lun_table); |
3081 | static DEVICE_ATTR_RO(port3_lun_table); | |
cba06e6d | 3082 | static DEVICE_ATTR_RW(irqpoll_weight); |
3065267a | 3083 | static DEVICE_ATTR_RW(num_hwqs); |
1dd0c0e4 | 3084 | static DEVICE_ATTR_RW(hwq_mode); |
15305514 MO |
3085 | |
3086 | static struct device_attribute *cxlflash_host_attrs[] = { | |
3087 | &dev_attr_port0, | |
3088 | &dev_attr_port1, | |
1cd7fabc MO |
3089 | &dev_attr_port2, |
3090 | &dev_attr_port3, | |
15305514 MO |
3091 | &dev_attr_lun_mode, |
3092 | &dev_attr_ioctl_version, | |
e0f01a21 MO |
3093 | &dev_attr_port0_lun_table, |
3094 | &dev_attr_port1_lun_table, | |
1cd7fabc MO |
3095 | &dev_attr_port2_lun_table, |
3096 | &dev_attr_port3_lun_table, | |
cba06e6d | 3097 | &dev_attr_irqpoll_weight, |
3065267a | 3098 | &dev_attr_num_hwqs, |
1dd0c0e4 | 3099 | &dev_attr_hwq_mode, |
15305514 MO |
3100 | NULL |
3101 | }; | |
3102 | ||
3103 | /* | |
3104 | * Device attributes | |
3105 | */ | |
e0f01a21 | 3106 | static DEVICE_ATTR_RO(mode); |
15305514 MO |
3107 | |
3108 | static struct device_attribute *cxlflash_dev_attrs[] = { | |
3109 | &dev_attr_mode, | |
3110 | NULL | |
3111 | }; | |
3112 | ||
3113 | /* | |
3114 | * Host template | |
3115 | */ | |
3116 | static struct scsi_host_template driver_template = { | |
3117 | .module = THIS_MODULE, | |
3118 | .name = CXLFLASH_ADAPTER_NAME, | |
3119 | .info = cxlflash_driver_info, | |
3120 | .ioctl = cxlflash_ioctl, | |
3121 | .proc_name = CXLFLASH_NAME, | |
3122 | .queuecommand = cxlflash_queuecommand, | |
7c4c41f1 | 3123 | .eh_abort_handler = cxlflash_eh_abort_handler, |
15305514 MO |
3124 | .eh_device_reset_handler = cxlflash_eh_device_reset_handler, |
3125 | .eh_host_reset_handler = cxlflash_eh_host_reset_handler, | |
3126 | .change_queue_depth = cxlflash_change_queue_depth, | |
83430833 | 3127 | .cmd_per_lun = CXLFLASH_MAX_CMDS_PER_LUN, |
15305514 | 3128 | .can_queue = CXLFLASH_MAX_CMDS, |
5fbb96c8 | 3129 | .cmd_size = sizeof(struct afu_cmd) + __alignof__(struct afu_cmd) - 1, |
15305514 | 3130 | .this_id = -1, |
68ab2d76 | 3131 | .sg_tablesize = 1, /* No scatter gather support */ |
15305514 MO |
3132 | .max_sectors = CXLFLASH_MAX_SECTORS, |
3133 | .use_clustering = ENABLE_CLUSTERING, | |
3134 | .shost_attrs = cxlflash_host_attrs, | |
3135 | .sdev_attrs = cxlflash_dev_attrs, | |
3136 | }; | |
3137 | ||
3138 | /* | |
3139 | * Device dependent values | |
3140 | */ | |
96e1b660 | 3141 | static struct dev_dependent_vals dev_corsa_vals = { CXLFLASH_MAX_SECTORS, |
0d419130 | 3142 | CXLFLASH_WWPN_VPD_REQUIRED }; |
96e1b660 | 3143 | static struct dev_dependent_vals dev_flash_gt_vals = { CXLFLASH_MAX_SECTORS, |
704c4b0d | 3144 | CXLFLASH_NOTIFY_SHUTDOWN }; |
94344520 MO |
3145 | static struct dev_dependent_vals dev_briard_vals = { CXLFLASH_MAX_SECTORS, |
3146 | CXLFLASH_NOTIFY_SHUTDOWN }; | |
15305514 MO |
3147 | |
3148 | /* | |
3149 | * PCI device binding table | |
3150 | */ | |
3151 | static struct pci_device_id cxlflash_pci_table[] = { | |
3152 | {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CORSA, | |
3153 | PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_corsa_vals}, | |
a2746fb1 MK |
3154 | {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_FLASH_GT, |
3155 | PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_flash_gt_vals}, | |
94344520 MO |
3156 | {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_BRIARD, |
3157 | PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_briard_vals}, | |
15305514 MO |
3158 | {} |
3159 | }; | |
3160 | ||
3161 | MODULE_DEVICE_TABLE(pci, cxlflash_pci_table); | |
3162 | ||
c21e0bbf MO |
3163 | /** |
3164 | * cxlflash_worker_thread() - work thread handler for the AFU | |
3165 | * @work: Work structure contained within cxlflash associated with host. | |
3166 | * | |
3167 | * Handles the following events: | |
3168 | * - Link reset which cannot be performed on interrupt context due to | |
3169 | * blocking up to a few seconds | |
ef51074a | 3170 | * - Rescan the host |
c21e0bbf MO |
3171 | */ |
3172 | static void cxlflash_worker_thread(struct work_struct *work) | |
3173 | { | |
5cdac81a MO |
3174 | struct cxlflash_cfg *cfg = container_of(work, struct cxlflash_cfg, |
3175 | work_q); | |
c21e0bbf | 3176 | struct afu *afu = cfg->afu; |
4392ba49 | 3177 | struct device *dev = &cfg->dev->dev; |
0aa14887 | 3178 | __be64 __iomem *fc_port_regs; |
c21e0bbf MO |
3179 | int port; |
3180 | ulong lock_flags; | |
3181 | ||
5cdac81a MO |
3182 | /* Avoid MMIO if the device has failed */ |
3183 | ||
3184 | if (cfg->state != STATE_NORMAL) | |
3185 | return; | |
3186 | ||
c21e0bbf MO |
3187 | spin_lock_irqsave(cfg->host->host_lock, lock_flags); |
3188 | ||
3189 | if (cfg->lr_state == LINK_RESET_REQUIRED) { | |
3190 | port = cfg->lr_port; | |
3191 | if (port < 0) | |
4392ba49 MO |
3192 | dev_err(dev, "%s: invalid port index %d\n", |
3193 | __func__, port); | |
c21e0bbf MO |
3194 | else { |
3195 | spin_unlock_irqrestore(cfg->host->host_lock, | |
3196 | lock_flags); | |
3197 | ||
3198 | /* The reset can block... */ | |
0aa14887 MO |
3199 | fc_port_regs = get_fc_port_regs(cfg, port); |
3200 | afu_link_reset(afu, port, fc_port_regs); | |
c21e0bbf MO |
3201 | spin_lock_irqsave(cfg->host->host_lock, lock_flags); |
3202 | } | |
3203 | ||
3204 | cfg->lr_state = LINK_RESET_COMPLETE; | |
3205 | } | |
3206 | ||
c21e0bbf | 3207 | spin_unlock_irqrestore(cfg->host->host_lock, lock_flags); |
ef51074a MO |
3208 | |
3209 | if (atomic_dec_if_positive(&cfg->scan_host_needed) >= 0) | |
3210 | scsi_scan_host(cfg->host); | |
c21e0bbf MO |
3211 | } |
3212 | ||
a834a36b UK |
3213 | /** |
3214 | * cxlflash_chr_open() - character device open handler | |
3215 | * @inode: Device inode associated with this character device. | |
3216 | * @file: File pointer for this device. | |
3217 | * | |
3218 | * Only users with admin privileges are allowed to open the character device. | |
3219 | * | |
3220 | * Return: 0 on success, -errno on failure | |
3221 | */ | |
3222 | static int cxlflash_chr_open(struct inode *inode, struct file *file) | |
3223 | { | |
3224 | struct cxlflash_cfg *cfg; | |
3225 | ||
3226 | if (!capable(CAP_SYS_ADMIN)) | |
3227 | return -EACCES; | |
3228 | ||
3229 | cfg = container_of(inode->i_cdev, struct cxlflash_cfg, cdev); | |
3230 | file->private_data = cfg; | |
3231 | ||
3232 | return 0; | |
3233 | } | |
3234 | ||
d6e32f53 MO |
3235 | /** |
3236 | * decode_hioctl() - translates encoded host ioctl to easily identifiable string | |
3237 | * @cmd: The host ioctl command to decode. | |
3238 | * | |
3239 | * Return: A string identifying the decoded host ioctl. | |
3240 | */ | |
3241 | static char *decode_hioctl(int cmd) | |
3242 | { | |
3243 | switch (cmd) { | |
9cf43a36 MO |
3244 | case HT_CXLFLASH_LUN_PROVISION: |
3245 | return __stringify_1(HT_CXLFLASH_LUN_PROVISION); | |
d6e32f53 MO |
3246 | } |
3247 | ||
3248 | return "UNKNOWN"; | |
3249 | } | |
3250 | ||
9cf43a36 MO |
3251 | /** |
3252 | * cxlflash_lun_provision() - host LUN provisioning handler | |
3253 | * @cfg: Internal structure associated with the host. | |
3254 | * @arg: Kernel copy of userspace ioctl data structure. | |
3255 | * | |
3256 | * Return: 0 on success, -errno on failure | |
3257 | */ | |
3258 | static int cxlflash_lun_provision(struct cxlflash_cfg *cfg, | |
3259 | struct ht_cxlflash_lun_provision *lunprov) | |
3260 | { | |
3261 | struct afu *afu = cfg->afu; | |
3262 | struct device *dev = &cfg->dev->dev; | |
3263 | struct sisl_ioarcb rcb; | |
3264 | struct sisl_ioasa asa; | |
3265 | __be64 __iomem *fc_port_regs; | |
3266 | u16 port = lunprov->port; | |
3267 | u16 scmd = lunprov->hdr.subcmd; | |
3268 | u16 type; | |
3269 | u64 reg; | |
3270 | u64 size; | |
3271 | u64 lun_id; | |
3272 | int rc = 0; | |
3273 | ||
3274 | if (!afu_is_lun_provision(afu)) { | |
3275 | rc = -ENOTSUPP; | |
3276 | goto out; | |
3277 | } | |
3278 | ||
3279 | if (port >= cfg->num_fc_ports) { | |
3280 | rc = -EINVAL; | |
3281 | goto out; | |
3282 | } | |
3283 | ||
3284 | switch (scmd) { | |
3285 | case HT_CXLFLASH_LUN_PROVISION_SUBCMD_CREATE_LUN: | |
3286 | type = SISL_AFU_LUN_PROVISION_CREATE; | |
3287 | size = lunprov->size; | |
3288 | lun_id = 0; | |
3289 | break; | |
3290 | case HT_CXLFLASH_LUN_PROVISION_SUBCMD_DELETE_LUN: | |
3291 | type = SISL_AFU_LUN_PROVISION_DELETE; | |
3292 | size = 0; | |
3293 | lun_id = lunprov->lun_id; | |
3294 | break; | |
3295 | case HT_CXLFLASH_LUN_PROVISION_SUBCMD_QUERY_PORT: | |
3296 | fc_port_regs = get_fc_port_regs(cfg, port); | |
3297 | ||
3298 | reg = readq_be(&fc_port_regs[FC_MAX_NUM_LUNS / 8]); | |
3299 | lunprov->max_num_luns = reg; | |
3300 | reg = readq_be(&fc_port_regs[FC_CUR_NUM_LUNS / 8]); | |
3301 | lunprov->cur_num_luns = reg; | |
3302 | reg = readq_be(&fc_port_regs[FC_MAX_CAP_PORT / 8]); | |
3303 | lunprov->max_cap_port = reg; | |
3304 | reg = readq_be(&fc_port_regs[FC_CUR_CAP_PORT / 8]); | |
3305 | lunprov->cur_cap_port = reg; | |
3306 | ||
3307 | goto out; | |
3308 | default: | |
3309 | rc = -EINVAL; | |
3310 | goto out; | |
3311 | } | |
3312 | ||
3313 | memset(&rcb, 0, sizeof(rcb)); | |
3314 | memset(&asa, 0, sizeof(asa)); | |
3315 | rcb.req_flags = SISL_REQ_FLAGS_AFU_CMD; | |
3316 | rcb.lun_id = lun_id; | |
3317 | rcb.msi = SISL_MSI_RRQ_UPDATED; | |
3318 | rcb.timeout = MC_LUN_PROV_TIMEOUT; | |
3319 | rcb.ioasa = &asa; | |
3320 | ||
3321 | rcb.cdb[0] = SISL_AFU_CMD_LUN_PROVISION; | |
3322 | rcb.cdb[1] = type; | |
3323 | rcb.cdb[2] = port; | |
3324 | put_unaligned_be64(size, &rcb.cdb[8]); | |
3325 | ||
3326 | rc = send_afu_cmd(afu, &rcb); | |
3327 | if (rc) { | |
3328 | dev_err(dev, "%s: send_afu_cmd failed rc=%d asc=%08x afux=%x\n", | |
3329 | __func__, rc, asa.ioasc, asa.afu_extra); | |
3330 | goto out; | |
3331 | } | |
3332 | ||
3333 | if (scmd == HT_CXLFLASH_LUN_PROVISION_SUBCMD_CREATE_LUN) { | |
3334 | lunprov->lun_id = (u64)asa.lunid_hi << 32 | asa.lunid_lo; | |
3335 | memcpy(lunprov->wwid, asa.wwid, sizeof(lunprov->wwid)); | |
3336 | } | |
3337 | out: | |
3338 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); | |
3339 | return rc; | |
3340 | } | |
3341 | ||
bc88ac47 MO |
3342 | /** |
3343 | * cxlflash_afu_debug() - host AFU debug handler | |
3344 | * @cfg: Internal structure associated with the host. | |
3345 | * @arg: Kernel copy of userspace ioctl data structure. | |
3346 | * | |
3347 | * For debug requests requiring a data buffer, always provide an aligned | |
3348 | * (cache line) buffer to the AFU to appease any alignment requirements. | |
3349 | * | |
3350 | * Return: 0 on success, -errno on failure | |
3351 | */ | |
3352 | static int cxlflash_afu_debug(struct cxlflash_cfg *cfg, | |
3353 | struct ht_cxlflash_afu_debug *afu_dbg) | |
3354 | { | |
3355 | struct afu *afu = cfg->afu; | |
3356 | struct device *dev = &cfg->dev->dev; | |
3357 | struct sisl_ioarcb rcb; | |
3358 | struct sisl_ioasa asa; | |
3359 | char *buf = NULL; | |
3360 | char *kbuf = NULL; | |
3361 | void __user *ubuf = (__force void __user *)afu_dbg->data_ea; | |
3362 | u16 req_flags = SISL_REQ_FLAGS_AFU_CMD; | |
3363 | u32 ulen = afu_dbg->data_len; | |
3364 | bool is_write = afu_dbg->hdr.flags & HT_CXLFLASH_HOST_WRITE; | |
3365 | int rc = 0; | |
3366 | ||
3367 | if (!afu_is_afu_debug(afu)) { | |
3368 | rc = -ENOTSUPP; | |
3369 | goto out; | |
3370 | } | |
3371 | ||
3372 | if (ulen) { | |
3373 | req_flags |= SISL_REQ_FLAGS_SUP_UNDERRUN; | |
3374 | ||
3375 | if (ulen > HT_CXLFLASH_AFU_DEBUG_MAX_DATA_LEN) { | |
3376 | rc = -EINVAL; | |
3377 | goto out; | |
3378 | } | |
3379 | ||
bc88ac47 MO |
3380 | buf = kmalloc(ulen + cache_line_size() - 1, GFP_KERNEL); |
3381 | if (unlikely(!buf)) { | |
3382 | rc = -ENOMEM; | |
3383 | goto out; | |
3384 | } | |
3385 | ||
3386 | kbuf = PTR_ALIGN(buf, cache_line_size()); | |
3387 | ||
3388 | if (is_write) { | |
3389 | req_flags |= SISL_REQ_FLAGS_HOST_WRITE; | |
3390 | ||
eeac8cda DC |
3391 | if (copy_from_user(kbuf, ubuf, ulen)) { |
3392 | rc = -EFAULT; | |
bc88ac47 | 3393 | goto out; |
eeac8cda | 3394 | } |
bc88ac47 MO |
3395 | } |
3396 | } | |
3397 | ||
3398 | memset(&rcb, 0, sizeof(rcb)); | |
3399 | memset(&asa, 0, sizeof(asa)); | |
3400 | ||
3401 | rcb.req_flags = req_flags; | |
3402 | rcb.msi = SISL_MSI_RRQ_UPDATED; | |
3403 | rcb.timeout = MC_AFU_DEBUG_TIMEOUT; | |
3404 | rcb.ioasa = &asa; | |
3405 | ||
3406 | if (ulen) { | |
3407 | rcb.data_len = ulen; | |
3408 | rcb.data_ea = (uintptr_t)kbuf; | |
3409 | } | |
3410 | ||
3411 | rcb.cdb[0] = SISL_AFU_CMD_DEBUG; | |
3412 | memcpy(&rcb.cdb[4], afu_dbg->afu_subcmd, | |
3413 | HT_CXLFLASH_AFU_DEBUG_SUBCMD_LEN); | |
3414 | ||
3415 | rc = send_afu_cmd(afu, &rcb); | |
3416 | if (rc) { | |
3417 | dev_err(dev, "%s: send_afu_cmd failed rc=%d asc=%08x afux=%x\n", | |
3418 | __func__, rc, asa.ioasc, asa.afu_extra); | |
3419 | goto out; | |
3420 | } | |
3421 | ||
eeac8cda DC |
3422 | if (ulen && !is_write) { |
3423 | if (copy_to_user(ubuf, kbuf, ulen)) | |
3424 | rc = -EFAULT; | |
3425 | } | |
bc88ac47 MO |
3426 | out: |
3427 | kfree(buf); | |
3428 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); | |
3429 | return rc; | |
3430 | } | |
3431 | ||
d6e32f53 MO |
3432 | /** |
3433 | * cxlflash_chr_ioctl() - character device IOCTL handler | |
3434 | * @file: File pointer for this device. | |
3435 | * @cmd: IOCTL command. | |
3436 | * @arg: Userspace ioctl data structure. | |
3437 | * | |
3438 | * A read/write semaphore is used to implement a 'drain' of currently | |
3439 | * running ioctls. The read semaphore is taken at the beginning of each | |
3440 | * ioctl thread and released upon concluding execution. Additionally the | |
3441 | * semaphore should be released and then reacquired in any ioctl execution | |
3442 | * path which will wait for an event to occur that is outside the scope of | |
3443 | * the ioctl (i.e. an adapter reset). To drain the ioctls currently running, | |
3444 | * a thread simply needs to acquire the write semaphore. | |
3445 | * | |
3446 | * Return: 0 on success, -errno on failure | |
3447 | */ | |
3448 | static long cxlflash_chr_ioctl(struct file *file, unsigned int cmd, | |
3449 | unsigned long arg) | |
3450 | { | |
3451 | typedef int (*hioctl) (struct cxlflash_cfg *, void *); | |
3452 | ||
3453 | struct cxlflash_cfg *cfg = file->private_data; | |
3454 | struct device *dev = &cfg->dev->dev; | |
3455 | char buf[sizeof(union cxlflash_ht_ioctls)]; | |
3456 | void __user *uarg = (void __user *)arg; | |
3457 | struct ht_cxlflash_hdr *hdr; | |
3458 | size_t size = 0; | |
3459 | bool known_ioctl = false; | |
3460 | int idx = 0; | |
3461 | int rc = 0; | |
3462 | hioctl do_ioctl = NULL; | |
3463 | ||
3464 | static const struct { | |
3465 | size_t size; | |
3466 | hioctl ioctl; | |
3467 | } ioctl_tbl[] = { /* NOTE: order matters here */ | |
9cf43a36 MO |
3468 | { sizeof(struct ht_cxlflash_lun_provision), |
3469 | (hioctl)cxlflash_lun_provision }, | |
bc88ac47 MO |
3470 | { sizeof(struct ht_cxlflash_afu_debug), |
3471 | (hioctl)cxlflash_afu_debug }, | |
d6e32f53 MO |
3472 | }; |
3473 | ||
3474 | /* Hold read semaphore so we can drain if needed */ | |
3475 | down_read(&cfg->ioctl_rwsem); | |
3476 | ||
3477 | dev_dbg(dev, "%s: cmd=%u idx=%d tbl_size=%lu\n", | |
3478 | __func__, cmd, idx, sizeof(ioctl_tbl)); | |
3479 | ||
3480 | switch (cmd) { | |
9cf43a36 | 3481 | case HT_CXLFLASH_LUN_PROVISION: |
bc88ac47 | 3482 | case HT_CXLFLASH_AFU_DEBUG: |
9cf43a36 MO |
3483 | known_ioctl = true; |
3484 | idx = _IOC_NR(HT_CXLFLASH_LUN_PROVISION) - _IOC_NR(cmd); | |
3485 | size = ioctl_tbl[idx].size; | |
3486 | do_ioctl = ioctl_tbl[idx].ioctl; | |
3487 | ||
3488 | if (likely(do_ioctl)) | |
3489 | break; | |
3490 | ||
3491 | /* fall through */ | |
d6e32f53 MO |
3492 | default: |
3493 | rc = -EINVAL; | |
3494 | goto out; | |
3495 | } | |
3496 | ||
3497 | if (unlikely(copy_from_user(&buf, uarg, size))) { | |
3498 | dev_err(dev, "%s: copy_from_user() fail " | |
3499 | "size=%lu cmd=%d (%s) uarg=%p\n", | |
3500 | __func__, size, cmd, decode_hioctl(cmd), uarg); | |
3501 | rc = -EFAULT; | |
3502 | goto out; | |
3503 | } | |
3504 | ||
3505 | hdr = (struct ht_cxlflash_hdr *)&buf; | |
3506 | if (hdr->version != HT_CXLFLASH_VERSION_0) { | |
3507 | dev_dbg(dev, "%s: Version %u not supported for %s\n", | |
3508 | __func__, hdr->version, decode_hioctl(cmd)); | |
3509 | rc = -EINVAL; | |
3510 | goto out; | |
3511 | } | |
3512 | ||
3513 | if (hdr->rsvd[0] || hdr->rsvd[1] || hdr->return_flags) { | |
3514 | dev_dbg(dev, "%s: Reserved/rflags populated\n", __func__); | |
3515 | rc = -EINVAL; | |
3516 | goto out; | |
3517 | } | |
3518 | ||
3519 | rc = do_ioctl(cfg, (void *)&buf); | |
3520 | if (likely(!rc)) | |
3521 | if (unlikely(copy_to_user(uarg, &buf, size))) { | |
3522 | dev_err(dev, "%s: copy_to_user() fail " | |
3523 | "size=%lu cmd=%d (%s) uarg=%p\n", | |
3524 | __func__, size, cmd, decode_hioctl(cmd), uarg); | |
3525 | rc = -EFAULT; | |
3526 | } | |
3527 | ||
3528 | /* fall through to exit */ | |
3529 | ||
3530 | out: | |
3531 | up_read(&cfg->ioctl_rwsem); | |
3532 | if (unlikely(rc && known_ioctl)) | |
3533 | dev_err(dev, "%s: ioctl %s (%08X) returned rc=%d\n", | |
3534 | __func__, decode_hioctl(cmd), cmd, rc); | |
3535 | else | |
3536 | dev_dbg(dev, "%s: ioctl %s (%08X) returned rc=%d\n", | |
3537 | __func__, decode_hioctl(cmd), cmd, rc); | |
3538 | return rc; | |
3539 | } | |
3540 | ||
a834a36b UK |
3541 | /* |
3542 | * Character device file operations | |
3543 | */ | |
3544 | static const struct file_operations cxlflash_chr_fops = { | |
3545 | .owner = THIS_MODULE, | |
3546 | .open = cxlflash_chr_open, | |
d6e32f53 MO |
3547 | .unlocked_ioctl = cxlflash_chr_ioctl, |
3548 | .compat_ioctl = cxlflash_chr_ioctl, | |
a834a36b UK |
3549 | }; |
3550 | ||
3551 | /** | |
3552 | * init_chrdev() - initialize the character device for the host | |
3553 | * @cfg: Internal structure associated with the host. | |
3554 | * | |
3555 | * Return: 0 on success, -errno on failure | |
3556 | */ | |
3557 | static int init_chrdev(struct cxlflash_cfg *cfg) | |
3558 | { | |
3559 | struct device *dev = &cfg->dev->dev; | |
3560 | struct device *char_dev; | |
3561 | dev_t devno; | |
3562 | int minor; | |
3563 | int rc = 0; | |
3564 | ||
3565 | minor = cxlflash_get_minor(); | |
3566 | if (unlikely(minor < 0)) { | |
3567 | dev_err(dev, "%s: Exhausted allowed adapters\n", __func__); | |
3568 | rc = -ENOSPC; | |
3569 | goto out; | |
3570 | } | |
3571 | ||
3572 | devno = MKDEV(cxlflash_major, minor); | |
3573 | cdev_init(&cfg->cdev, &cxlflash_chr_fops); | |
3574 | ||
3575 | rc = cdev_add(&cfg->cdev, devno, 1); | |
3576 | if (rc) { | |
3577 | dev_err(dev, "%s: cdev_add failed rc=%d\n", __func__, rc); | |
3578 | goto err1; | |
3579 | } | |
3580 | ||
3581 | char_dev = device_create(cxlflash_class, NULL, devno, | |
3582 | NULL, "cxlflash%d", minor); | |
3583 | if (IS_ERR(char_dev)) { | |
3584 | rc = PTR_ERR(char_dev); | |
3585 | dev_err(dev, "%s: device_create failed rc=%d\n", | |
3586 | __func__, rc); | |
3587 | goto err2; | |
3588 | } | |
3589 | ||
3590 | cfg->chardev = char_dev; | |
3591 | out: | |
3592 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); | |
3593 | return rc; | |
3594 | err2: | |
3595 | cdev_del(&cfg->cdev); | |
3596 | err1: | |
3597 | cxlflash_put_minor(minor); | |
3598 | goto out; | |
3599 | } | |
3600 | ||
c21e0bbf MO |
3601 | /** |
3602 | * cxlflash_probe() - PCI entry point to add host | |
3603 | * @pdev: PCI device associated with the host. | |
3604 | * @dev_id: PCI device id associated with device. | |
3605 | * | |
323e3342 MO |
3606 | * The device will initially start out in a 'probing' state and |
3607 | * transition to the 'normal' state at the end of a successful | |
3608 | * probe. Should an EEH event occur during probe, the notification | |
3609 | * thread (error_detected()) will wait until the probe handler | |
3610 | * is nearly complete. At that time, the device will be moved to | |
3611 | * a 'probed' state and the EEH thread woken up to drive the slot | |
3612 | * reset and recovery (device moves to 'normal' state). Meanwhile, | |
3613 | * the probe will be allowed to exit successfully. | |
3614 | * | |
1284fb0c | 3615 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
3616 | */ |
3617 | static int cxlflash_probe(struct pci_dev *pdev, | |
3618 | const struct pci_device_id *dev_id) | |
3619 | { | |
3620 | struct Scsi_Host *host; | |
3621 | struct cxlflash_cfg *cfg = NULL; | |
fb67d44d | 3622 | struct device *dev = &pdev->dev; |
c21e0bbf MO |
3623 | struct dev_dependent_vals *ddv; |
3624 | int rc = 0; | |
78ae028e | 3625 | int k; |
c21e0bbf MO |
3626 | |
3627 | dev_dbg(&pdev->dev, "%s: Found CXLFLASH with IRQ: %d\n", | |
3628 | __func__, pdev->irq); | |
3629 | ||
3630 | ddv = (struct dev_dependent_vals *)dev_id->driver_data; | |
3631 | driver_template.max_sectors = ddv->max_sectors; | |
3632 | ||
3633 | host = scsi_host_alloc(&driver_template, sizeof(struct cxlflash_cfg)); | |
3634 | if (!host) { | |
fb67d44d | 3635 | dev_err(dev, "%s: scsi_host_alloc failed\n", __func__); |
c21e0bbf MO |
3636 | rc = -ENOMEM; |
3637 | goto out; | |
3638 | } | |
3639 | ||
3640 | host->max_id = CXLFLASH_MAX_NUM_TARGETS_PER_BUS; | |
3641 | host->max_lun = CXLFLASH_MAX_NUM_LUNS_PER_TARGET; | |
c21e0bbf MO |
3642 | host->unique_id = host->host_no; |
3643 | host->max_cmd_len = CXLFLASH_MAX_CDB_LEN; | |
3644 | ||
fb67d44d | 3645 | cfg = shost_priv(host); |
c21e0bbf MO |
3646 | cfg->host = host; |
3647 | rc = alloc_mem(cfg); | |
3648 | if (rc) { | |
fb67d44d | 3649 | dev_err(dev, "%s: alloc_mem failed\n", __func__); |
c21e0bbf | 3650 | rc = -ENOMEM; |
8b5b1e87 | 3651 | scsi_host_put(cfg->host); |
c21e0bbf MO |
3652 | goto out; |
3653 | } | |
3654 | ||
3655 | cfg->init_state = INIT_STATE_NONE; | |
3656 | cfg->dev = pdev; | |
29b4894f | 3657 | cfg->ops = &cxlflash_cxl_ops; |
17ead26f | 3658 | cfg->cxl_fops = cxlflash_cxl_fops; |
2cb79266 MO |
3659 | |
3660 | /* | |
78ae028e MO |
3661 | * Promoted LUNs move to the top of the LUN table. The rest stay on |
3662 | * the bottom half. The bottom half grows from the end (index = 255), | |
3663 | * whereas the top half grows from the beginning (index = 0). | |
3664 | * | |
3665 | * Initialize the last LUN index for all possible ports. | |
2cb79266 | 3666 | */ |
78ae028e MO |
3667 | cfg->promote_lun_index = 0; |
3668 | ||
3669 | for (k = 0; k < MAX_FC_PORTS; k++) | |
3670 | cfg->last_lun_index[k] = CXLFLASH_NUM_VLUNS/2 - 1; | |
2cb79266 | 3671 | |
c21e0bbf | 3672 | cfg->dev_id = (struct pci_device_id *)dev_id; |
c21e0bbf MO |
3673 | |
3674 | init_waitqueue_head(&cfg->tmf_waitq); | |
439e85c1 | 3675 | init_waitqueue_head(&cfg->reset_waitq); |
c21e0bbf MO |
3676 | |
3677 | INIT_WORK(&cfg->work_q, cxlflash_worker_thread); | |
3678 | cfg->lr_state = LINK_RESET_INVALID; | |
3679 | cfg->lr_port = -1; | |
0d73122c | 3680 | spin_lock_init(&cfg->tmf_slock); |
65be2c79 MO |
3681 | mutex_init(&cfg->ctx_tbl_list_mutex); |
3682 | mutex_init(&cfg->ctx_recovery_mutex); | |
0a27ae51 | 3683 | init_rwsem(&cfg->ioctl_rwsem); |
65be2c79 MO |
3684 | INIT_LIST_HEAD(&cfg->ctx_err_recovery); |
3685 | INIT_LIST_HEAD(&cfg->lluns); | |
c21e0bbf MO |
3686 | |
3687 | pci_set_drvdata(pdev, cfg); | |
3688 | ||
29b4894f | 3689 | cfg->afu_cookie = cfg->ops->create_afu(pdev); |
c21e0bbf MO |
3690 | |
3691 | rc = init_pci(cfg); | |
3692 | if (rc) { | |
fb67d44d | 3693 | dev_err(dev, "%s: init_pci failed rc=%d\n", __func__, rc); |
c21e0bbf MO |
3694 | goto out_remove; |
3695 | } | |
3696 | cfg->init_state = INIT_STATE_PCI; | |
3697 | ||
3698 | rc = init_afu(cfg); | |
323e3342 | 3699 | if (rc && !wq_has_sleeper(&cfg->reset_waitq)) { |
fb67d44d | 3700 | dev_err(dev, "%s: init_afu failed rc=%d\n", __func__, rc); |
c21e0bbf MO |
3701 | goto out_remove; |
3702 | } | |
3703 | cfg->init_state = INIT_STATE_AFU; | |
3704 | ||
c21e0bbf MO |
3705 | rc = init_scsi(cfg); |
3706 | if (rc) { | |
fb67d44d | 3707 | dev_err(dev, "%s: init_scsi failed rc=%d\n", __func__, rc); |
c21e0bbf MO |
3708 | goto out_remove; |
3709 | } | |
3710 | cfg->init_state = INIT_STATE_SCSI; | |
3711 | ||
a834a36b UK |
3712 | rc = init_chrdev(cfg); |
3713 | if (rc) { | |
3714 | dev_err(dev, "%s: init_chrdev failed rc=%d\n", __func__, rc); | |
3715 | goto out_remove; | |
3716 | } | |
3717 | cfg->init_state = INIT_STATE_CDEV; | |
3718 | ||
323e3342 MO |
3719 | if (wq_has_sleeper(&cfg->reset_waitq)) { |
3720 | cfg->state = STATE_PROBED; | |
3721 | wake_up_all(&cfg->reset_waitq); | |
3722 | } else | |
3723 | cfg->state = STATE_NORMAL; | |
c21e0bbf | 3724 | out: |
fb67d44d | 3725 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); |
c21e0bbf MO |
3726 | return rc; |
3727 | ||
3728 | out_remove: | |
3729 | cxlflash_remove(pdev); | |
3730 | goto out; | |
3731 | } | |
3732 | ||
5cdac81a MO |
3733 | /** |
3734 | * cxlflash_pci_error_detected() - called when a PCI error is detected | |
3735 | * @pdev: PCI device struct. | |
3736 | * @state: PCI channel state. | |
3737 | * | |
1d3324c3 MO |
3738 | * When an EEH occurs during an active reset, wait until the reset is |
3739 | * complete and then take action based upon the device state. | |
3740 | * | |
5cdac81a MO |
3741 | * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT |
3742 | */ | |
3743 | static pci_ers_result_t cxlflash_pci_error_detected(struct pci_dev *pdev, | |
3744 | pci_channel_state_t state) | |
3745 | { | |
65be2c79 | 3746 | int rc = 0; |
5cdac81a MO |
3747 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); |
3748 | struct device *dev = &cfg->dev->dev; | |
3749 | ||
3750 | dev_dbg(dev, "%s: pdev=%p state=%u\n", __func__, pdev, state); | |
3751 | ||
3752 | switch (state) { | |
3753 | case pci_channel_io_frozen: | |
323e3342 MO |
3754 | wait_event(cfg->reset_waitq, cfg->state != STATE_RESET && |
3755 | cfg->state != STATE_PROBING); | |
1d3324c3 MO |
3756 | if (cfg->state == STATE_FAILTERM) |
3757 | return PCI_ERS_RESULT_DISCONNECT; | |
3758 | ||
439e85c1 | 3759 | cfg->state = STATE_RESET; |
5cdac81a | 3760 | scsi_block_requests(cfg->host); |
0a27ae51 | 3761 | drain_ioctls(cfg); |
65be2c79 MO |
3762 | rc = cxlflash_mark_contexts_error(cfg); |
3763 | if (unlikely(rc)) | |
fb67d44d | 3764 | dev_err(dev, "%s: Failed to mark user contexts rc=%d\n", |
65be2c79 | 3765 | __func__, rc); |
9526f360 | 3766 | term_afu(cfg); |
5cdac81a MO |
3767 | return PCI_ERS_RESULT_NEED_RESET; |
3768 | case pci_channel_io_perm_failure: | |
3769 | cfg->state = STATE_FAILTERM; | |
439e85c1 | 3770 | wake_up_all(&cfg->reset_waitq); |
5cdac81a MO |
3771 | scsi_unblock_requests(cfg->host); |
3772 | return PCI_ERS_RESULT_DISCONNECT; | |
3773 | default: | |
3774 | break; | |
3775 | } | |
3776 | return PCI_ERS_RESULT_NEED_RESET; | |
3777 | } | |
3778 | ||
3779 | /** | |
3780 | * cxlflash_pci_slot_reset() - called when PCI slot has been reset | |
3781 | * @pdev: PCI device struct. | |
3782 | * | |
3783 | * This routine is called by the pci error recovery code after the PCI | |
3784 | * slot has been reset, just before we should resume normal operations. | |
3785 | * | |
3786 | * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT | |
3787 | */ | |
3788 | static pci_ers_result_t cxlflash_pci_slot_reset(struct pci_dev *pdev) | |
3789 | { | |
3790 | int rc = 0; | |
3791 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); | |
3792 | struct device *dev = &cfg->dev->dev; | |
3793 | ||
3794 | dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev); | |
3795 | ||
3796 | rc = init_afu(cfg); | |
3797 | if (unlikely(rc)) { | |
fb67d44d | 3798 | dev_err(dev, "%s: EEH recovery failed rc=%d\n", __func__, rc); |
5cdac81a MO |
3799 | return PCI_ERS_RESULT_DISCONNECT; |
3800 | } | |
3801 | ||
3802 | return PCI_ERS_RESULT_RECOVERED; | |
3803 | } | |
3804 | ||
3805 | /** | |
3806 | * cxlflash_pci_resume() - called when normal operation can resume | |
3807 | * @pdev: PCI device struct | |
3808 | */ | |
3809 | static void cxlflash_pci_resume(struct pci_dev *pdev) | |
3810 | { | |
3811 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); | |
3812 | struct device *dev = &cfg->dev->dev; | |
3813 | ||
3814 | dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev); | |
3815 | ||
3816 | cfg->state = STATE_NORMAL; | |
439e85c1 | 3817 | wake_up_all(&cfg->reset_waitq); |
5cdac81a MO |
3818 | scsi_unblock_requests(cfg->host); |
3819 | } | |
3820 | ||
a834a36b UK |
3821 | /** |
3822 | * cxlflash_devnode() - provides devtmpfs for devices in the cxlflash class | |
3823 | * @dev: Character device. | |
3824 | * @mode: Mode that can be used to verify access. | |
3825 | * | |
3826 | * Return: Allocated string describing the devtmpfs structure. | |
3827 | */ | |
3828 | static char *cxlflash_devnode(struct device *dev, umode_t *mode) | |
3829 | { | |
3830 | return kasprintf(GFP_KERNEL, "cxlflash/%s", dev_name(dev)); | |
3831 | } | |
3832 | ||
3833 | /** | |
3834 | * cxlflash_class_init() - create character device class | |
3835 | * | |
3836 | * Return: 0 on success, -errno on failure | |
3837 | */ | |
3838 | static int cxlflash_class_init(void) | |
3839 | { | |
3840 | dev_t devno; | |
3841 | int rc = 0; | |
3842 | ||
3843 | rc = alloc_chrdev_region(&devno, 0, CXLFLASH_MAX_ADAPTERS, "cxlflash"); | |
3844 | if (unlikely(rc)) { | |
3845 | pr_err("%s: alloc_chrdev_region failed rc=%d\n", __func__, rc); | |
3846 | goto out; | |
3847 | } | |
3848 | ||
3849 | cxlflash_major = MAJOR(devno); | |
3850 | ||
3851 | cxlflash_class = class_create(THIS_MODULE, "cxlflash"); | |
3852 | if (IS_ERR(cxlflash_class)) { | |
3853 | rc = PTR_ERR(cxlflash_class); | |
3854 | pr_err("%s: class_create failed rc=%d\n", __func__, rc); | |
3855 | goto err; | |
3856 | } | |
3857 | ||
3858 | cxlflash_class->devnode = cxlflash_devnode; | |
3859 | out: | |
3860 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
3861 | return rc; | |
3862 | err: | |
3863 | unregister_chrdev_region(devno, CXLFLASH_MAX_ADAPTERS); | |
3864 | goto out; | |
3865 | } | |
3866 | ||
3867 | /** | |
3868 | * cxlflash_class_exit() - destroy character device class | |
3869 | */ | |
3870 | static void cxlflash_class_exit(void) | |
3871 | { | |
3872 | dev_t devno = MKDEV(cxlflash_major, 0); | |
3873 | ||
3874 | class_destroy(cxlflash_class); | |
3875 | unregister_chrdev_region(devno, CXLFLASH_MAX_ADAPTERS); | |
3876 | } | |
3877 | ||
5cdac81a MO |
3878 | static const struct pci_error_handlers cxlflash_err_handler = { |
3879 | .error_detected = cxlflash_pci_error_detected, | |
3880 | .slot_reset = cxlflash_pci_slot_reset, | |
3881 | .resume = cxlflash_pci_resume, | |
3882 | }; | |
3883 | ||
c21e0bbf MO |
3884 | /* |
3885 | * PCI device structure | |
3886 | */ | |
3887 | static struct pci_driver cxlflash_driver = { | |
3888 | .name = CXLFLASH_NAME, | |
3889 | .id_table = cxlflash_pci_table, | |
3890 | .probe = cxlflash_probe, | |
3891 | .remove = cxlflash_remove, | |
babf985d | 3892 | .shutdown = cxlflash_remove, |
5cdac81a | 3893 | .err_handler = &cxlflash_err_handler, |
c21e0bbf MO |
3894 | }; |
3895 | ||
3896 | /** | |
3897 | * init_cxlflash() - module entry point | |
3898 | * | |
1284fb0c | 3899 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
3900 | */ |
3901 | static int __init init_cxlflash(void) | |
3902 | { | |
a834a36b UK |
3903 | int rc; |
3904 | ||
cd41e18d | 3905 | check_sizes(); |
65be2c79 | 3906 | cxlflash_list_init(); |
a834a36b UK |
3907 | rc = cxlflash_class_init(); |
3908 | if (unlikely(rc)) | |
3909 | goto out; | |
65be2c79 | 3910 | |
a834a36b UK |
3911 | rc = pci_register_driver(&cxlflash_driver); |
3912 | if (unlikely(rc)) | |
3913 | goto err; | |
3914 | out: | |
3915 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
3916 | return rc; | |
3917 | err: | |
3918 | cxlflash_class_exit(); | |
3919 | goto out; | |
c21e0bbf MO |
3920 | } |
3921 | ||
3922 | /** | |
3923 | * exit_cxlflash() - module exit point | |
3924 | */ | |
3925 | static void __exit exit_cxlflash(void) | |
3926 | { | |
65be2c79 MO |
3927 | cxlflash_term_global_luns(); |
3928 | cxlflash_free_errpage(); | |
3929 | ||
c21e0bbf | 3930 | pci_unregister_driver(&cxlflash_driver); |
a834a36b | 3931 | cxlflash_class_exit(); |
c21e0bbf MO |
3932 | } |
3933 | ||
3934 | module_init(init_cxlflash); | |
3935 | module_exit(exit_cxlflash); |