]>
Commit | Line | Data |
---|---|---|
c21e0bbf MO |
1 | /* |
2 | * CXL Flash Device Driver | |
3 | * | |
4 | * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation | |
5 | * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation | |
6 | * | |
7 | * Copyright (C) 2015 IBM Corporation | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | #include <linux/delay.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/pci.h> | |
19 | ||
20 | #include <asm/unaligned.h> | |
21 | ||
22 | #include <misc/cxl.h> | |
23 | ||
24 | #include <scsi/scsi_cmnd.h> | |
25 | #include <scsi/scsi_host.h> | |
65be2c79 | 26 | #include <uapi/scsi/cxlflash_ioctl.h> |
c21e0bbf MO |
27 | |
28 | #include "main.h" | |
29 | #include "sislite.h" | |
30 | #include "common.h" | |
31 | ||
32 | MODULE_DESCRIPTION(CXLFLASH_ADAPTER_NAME); | |
33 | MODULE_AUTHOR("Manoj N. Kumar <manoj@linux.vnet.ibm.com>"); | |
34 | MODULE_AUTHOR("Matthew R. Ochs <mrochs@linux.vnet.ibm.com>"); | |
35 | MODULE_LICENSE("GPL"); | |
36 | ||
c21e0bbf MO |
37 | /** |
38 | * process_cmd_err() - command error handler | |
39 | * @cmd: AFU command that experienced the error. | |
40 | * @scp: SCSI command associated with the AFU command in error. | |
41 | * | |
42 | * Translates error bits from AFU command to SCSI command results. | |
43 | */ | |
44 | static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp) | |
45 | { | |
46 | struct sisl_ioarcb *ioarcb; | |
47 | struct sisl_ioasa *ioasa; | |
8396012f | 48 | u32 resid; |
c21e0bbf MO |
49 | |
50 | if (unlikely(!cmd)) | |
51 | return; | |
52 | ||
53 | ioarcb = &(cmd->rcb); | |
54 | ioasa = &(cmd->sa); | |
55 | ||
56 | if (ioasa->rc.flags & SISL_RC_FLAGS_UNDERRUN) { | |
8396012f MO |
57 | resid = ioasa->resid; |
58 | scsi_set_resid(scp, resid); | |
59 | pr_debug("%s: cmd underrun cmd = %p scp = %p, resid = %d\n", | |
60 | __func__, cmd, scp, resid); | |
c21e0bbf MO |
61 | } |
62 | ||
63 | if (ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN) { | |
64 | pr_debug("%s: cmd underrun cmd = %p scp = %p\n", | |
65 | __func__, cmd, scp); | |
66 | scp->result = (DID_ERROR << 16); | |
67 | } | |
68 | ||
69 | pr_debug("%s: cmd failed afu_rc=%d scsi_rc=%d fc_rc=%d " | |
4392ba49 | 70 | "afu_extra=0x%X, scsi_extra=0x%X, fc_extra=0x%X\n", |
c21e0bbf MO |
71 | __func__, ioasa->rc.afu_rc, ioasa->rc.scsi_rc, |
72 | ioasa->rc.fc_rc, ioasa->afu_extra, ioasa->scsi_extra, | |
73 | ioasa->fc_extra); | |
74 | ||
75 | if (ioasa->rc.scsi_rc) { | |
76 | /* We have a SCSI status */ | |
77 | if (ioasa->rc.flags & SISL_RC_FLAGS_SENSE_VALID) { | |
78 | memcpy(scp->sense_buffer, ioasa->sense_data, | |
79 | SISL_SENSE_DATA_LEN); | |
80 | scp->result = ioasa->rc.scsi_rc; | |
81 | } else | |
82 | scp->result = ioasa->rc.scsi_rc | (DID_ERROR << 16); | |
83 | } | |
84 | ||
85 | /* | |
86 | * We encountered an error. Set scp->result based on nature | |
87 | * of error. | |
88 | */ | |
89 | if (ioasa->rc.fc_rc) { | |
90 | /* We have an FC status */ | |
91 | switch (ioasa->rc.fc_rc) { | |
92 | case SISL_FC_RC_LINKDOWN: | |
93 | scp->result = (DID_REQUEUE << 16); | |
94 | break; | |
95 | case SISL_FC_RC_RESID: | |
96 | /* This indicates an FCP resid underrun */ | |
97 | if (!(ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN)) { | |
98 | /* If the SISL_RC_FLAGS_OVERRUN flag was set, | |
99 | * then we will handle this error else where. | |
100 | * If not then we must handle it here. | |
8396012f | 101 | * This is probably an AFU bug. |
c21e0bbf MO |
102 | */ |
103 | scp->result = (DID_ERROR << 16); | |
104 | } | |
105 | break; | |
106 | case SISL_FC_RC_RESIDERR: | |
107 | /* Resid mismatch between adapter and device */ | |
108 | case SISL_FC_RC_TGTABORT: | |
109 | case SISL_FC_RC_ABORTOK: | |
110 | case SISL_FC_RC_ABORTFAIL: | |
111 | case SISL_FC_RC_NOLOGI: | |
112 | case SISL_FC_RC_ABORTPEND: | |
113 | case SISL_FC_RC_WRABORTPEND: | |
114 | case SISL_FC_RC_NOEXP: | |
115 | case SISL_FC_RC_INUSE: | |
116 | scp->result = (DID_ERROR << 16); | |
117 | break; | |
118 | } | |
119 | } | |
120 | ||
121 | if (ioasa->rc.afu_rc) { | |
122 | /* We have an AFU error */ | |
123 | switch (ioasa->rc.afu_rc) { | |
124 | case SISL_AFU_RC_NO_CHANNELS: | |
8396012f | 125 | scp->result = (DID_NO_CONNECT << 16); |
c21e0bbf MO |
126 | break; |
127 | case SISL_AFU_RC_DATA_DMA_ERR: | |
128 | switch (ioasa->afu_extra) { | |
129 | case SISL_AFU_DMA_ERR_PAGE_IN: | |
130 | /* Retry */ | |
131 | scp->result = (DID_IMM_RETRY << 16); | |
132 | break; | |
133 | case SISL_AFU_DMA_ERR_INVALID_EA: | |
134 | default: | |
135 | scp->result = (DID_ERROR << 16); | |
136 | } | |
137 | break; | |
138 | case SISL_AFU_RC_OUT_OF_DATA_BUFS: | |
139 | /* Retry */ | |
140 | scp->result = (DID_ALLOC_FAILURE << 16); | |
141 | break; | |
142 | default: | |
143 | scp->result = (DID_ERROR << 16); | |
144 | } | |
145 | } | |
146 | } | |
147 | ||
148 | /** | |
149 | * cmd_complete() - command completion handler | |
150 | * @cmd: AFU command that has completed. | |
151 | * | |
152 | * Prepares and submits command that has either completed or timed out to | |
153 | * the SCSI stack. Checks AFU command back into command pool for non-internal | |
154 | * (rcb.scp populated) commands. | |
155 | */ | |
156 | static void cmd_complete(struct afu_cmd *cmd) | |
157 | { | |
158 | struct scsi_cmnd *scp; | |
c21e0bbf MO |
159 | ulong lock_flags; |
160 | struct afu *afu = cmd->parent; | |
161 | struct cxlflash_cfg *cfg = afu->parent; | |
162 | bool cmd_is_tmf; | |
163 | ||
c21e0bbf MO |
164 | if (cmd->rcb.scp) { |
165 | scp = cmd->rcb.scp; | |
8396012f | 166 | if (unlikely(cmd->sa.ioasc)) |
c21e0bbf MO |
167 | process_cmd_err(cmd, scp); |
168 | else | |
169 | scp->result = (DID_OK << 16); | |
170 | ||
c21e0bbf | 171 | cmd_is_tmf = cmd->cmd_tmf; |
c21e0bbf | 172 | |
4392ba49 MO |
173 | pr_debug_ratelimited("%s: calling scsi_done scp=%p result=%X " |
174 | "ioasc=%d\n", __func__, scp, scp->result, | |
175 | cmd->sa.ioasc); | |
c21e0bbf | 176 | |
c21e0bbf MO |
177 | scsi_dma_unmap(scp); |
178 | scp->scsi_done(scp); | |
179 | ||
180 | if (cmd_is_tmf) { | |
018d1dc9 | 181 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
182 | cfg->tmf_active = false; |
183 | wake_up_all_locked(&cfg->tmf_waitq); | |
018d1dc9 | 184 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
185 | } |
186 | } else | |
187 | complete(&cmd->cevent); | |
188 | } | |
189 | ||
15305514 MO |
190 | /** |
191 | * context_reset() - timeout handler for AFU commands | |
192 | * @cmd: AFU command that timed out. | |
193 | * | |
194 | * Sends a reset to the AFU. | |
195 | */ | |
196 | static void context_reset(struct afu_cmd *cmd) | |
197 | { | |
198 | int nretry = 0; | |
199 | u64 rrin = 0x1; | |
15305514 | 200 | struct afu *afu = cmd->parent; |
3d2f617d UK |
201 | struct cxlflash_cfg *cfg = afu->parent; |
202 | struct device *dev = &cfg->dev->dev; | |
15305514 MO |
203 | |
204 | pr_debug("%s: cmd=%p\n", __func__, cmd); | |
205 | ||
15305514 MO |
206 | writeq_be(rrin, &afu->host_map->ioarrin); |
207 | do { | |
208 | rrin = readq_be(&afu->host_map->ioarrin); | |
209 | if (rrin != 0x1) | |
210 | break; | |
211 | /* Double delay each time */ | |
ea765431 | 212 | udelay(1 << nretry); |
15305514 | 213 | } while (nretry++ < MC_ROOM_RETRY_CNT); |
3d2f617d UK |
214 | |
215 | dev_dbg(dev, "%s: returning rrin=0x%016llX nretry=%d\n", | |
216 | __func__, rrin, nretry); | |
15305514 MO |
217 | } |
218 | ||
219 | /** | |
220 | * send_cmd() - sends an AFU command | |
221 | * @afu: AFU associated with the host. | |
222 | * @cmd: AFU command to send. | |
223 | * | |
224 | * Return: | |
1284fb0c | 225 | * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure |
15305514 MO |
226 | */ |
227 | static int send_cmd(struct afu *afu, struct afu_cmd *cmd) | |
228 | { | |
229 | struct cxlflash_cfg *cfg = afu->parent; | |
230 | struct device *dev = &cfg->dev->dev; | |
15305514 | 231 | int rc = 0; |
11f7b184 UK |
232 | s64 room; |
233 | ulong lock_flags; | |
15305514 MO |
234 | |
235 | /* | |
11f7b184 UK |
236 | * To avoid the performance penalty of MMIO, spread the update of |
237 | * 'room' over multiple commands. | |
15305514 | 238 | */ |
11f7b184 UK |
239 | spin_lock_irqsave(&afu->rrin_slock, lock_flags); |
240 | if (--afu->room < 0) { | |
241 | room = readq_be(&afu->host_map->cmd_room); | |
242 | if (room <= 0) { | |
243 | dev_dbg_ratelimited(dev, "%s: no cmd_room to send " | |
244 | "0x%02X, room=0x%016llX\n", | |
245 | __func__, cmd->rcb.cdb[0], room); | |
246 | afu->room = 0; | |
247 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
248 | goto out; | |
15305514 | 249 | } |
11f7b184 | 250 | afu->room = room - 1; |
15305514 MO |
251 | } |
252 | ||
15305514 MO |
253 | writeq_be((u64)&cmd->rcb, &afu->host_map->ioarrin); |
254 | out: | |
11f7b184 | 255 | spin_unlock_irqrestore(&afu->rrin_slock, lock_flags); |
15305514 MO |
256 | pr_devel("%s: cmd=%p len=%d ea=%p rc=%d\n", __func__, cmd, |
257 | cmd->rcb.data_len, (void *)cmd->rcb.data_ea, rc); | |
258 | return rc; | |
15305514 MO |
259 | } |
260 | ||
261 | /** | |
262 | * wait_resp() - polls for a response or timeout to a sent AFU command | |
263 | * @afu: AFU associated with the host. | |
264 | * @cmd: AFU command that was sent. | |
9ba848ac MO |
265 | * |
266 | * Return: | |
267 | * 0 on success, -1 on timeout/error | |
15305514 | 268 | */ |
9ba848ac | 269 | static int wait_resp(struct afu *afu, struct afu_cmd *cmd) |
15305514 | 270 | { |
9ba848ac | 271 | int rc = 0; |
15305514 MO |
272 | ulong timeout = msecs_to_jiffies(cmd->rcb.timeout * 2 * 1000); |
273 | ||
274 | timeout = wait_for_completion_timeout(&cmd->cevent, timeout); | |
9ba848ac | 275 | if (!timeout) { |
15305514 | 276 | context_reset(cmd); |
9ba848ac MO |
277 | rc = -1; |
278 | } | |
15305514 | 279 | |
9ba848ac | 280 | if (unlikely(cmd->sa.ioasc != 0)) { |
15305514 MO |
281 | pr_err("%s: CMD 0x%X failed, IOASC: flags 0x%X, afu_rc 0x%X, " |
282 | "scsi_rc 0x%X, fc_rc 0x%X\n", __func__, cmd->rcb.cdb[0], | |
283 | cmd->sa.rc.flags, cmd->sa.rc.afu_rc, cmd->sa.rc.scsi_rc, | |
284 | cmd->sa.rc.fc_rc); | |
9ba848ac MO |
285 | rc = -1; |
286 | } | |
287 | ||
288 | return rc; | |
15305514 MO |
289 | } |
290 | ||
c21e0bbf MO |
291 | /** |
292 | * send_tmf() - sends a Task Management Function (TMF) | |
293 | * @afu: AFU to checkout from. | |
294 | * @scp: SCSI command from stack. | |
295 | * @tmfcmd: TMF command to send. | |
296 | * | |
297 | * Return: | |
1284fb0c | 298 | * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure |
c21e0bbf MO |
299 | */ |
300 | static int send_tmf(struct afu *afu, struct scsi_cmnd *scp, u64 tmfcmd) | |
301 | { | |
c21e0bbf | 302 | u32 port_sel = scp->device->channel + 1; |
c21e0bbf MO |
303 | struct Scsi_Host *host = scp->device->host; |
304 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; | |
d4ace351 | 305 | struct afu_cmd *cmd = sc_to_afucz(scp); |
4392ba49 | 306 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
307 | ulong lock_flags; |
308 | int rc = 0; | |
018d1dc9 | 309 | ulong to; |
c21e0bbf | 310 | |
018d1dc9 MO |
311 | /* When Task Management Function is active do not send another */ |
312 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); | |
c21e0bbf | 313 | if (cfg->tmf_active) |
018d1dc9 MO |
314 | wait_event_interruptible_lock_irq(cfg->tmf_waitq, |
315 | !cfg->tmf_active, | |
316 | cfg->tmf_slock); | |
c21e0bbf | 317 | cfg->tmf_active = true; |
018d1dc9 | 318 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 319 | |
d4ace351 MO |
320 | cmd->rcb.scp = scp; |
321 | cmd->parent = afu; | |
322 | cmd->cmd_tmf = true; | |
323 | ||
c21e0bbf | 324 | cmd->rcb.ctx_id = afu->ctx_hndl; |
5fbb96c8 | 325 | cmd->rcb.msi = SISL_MSI_RRQ_UPDATED; |
c21e0bbf MO |
326 | cmd->rcb.port_sel = port_sel; |
327 | cmd->rcb.lun_id = lun_to_lunid(scp->device->lun); | |
c21e0bbf | 328 | cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID | |
d4ace351 MO |
329 | SISL_REQ_FLAGS_SUP_UNDERRUN | |
330 | SISL_REQ_FLAGS_TMF_CMD); | |
c21e0bbf MO |
331 | memcpy(cmd->rcb.cdb, &tmfcmd, sizeof(tmfcmd)); |
332 | ||
15305514 | 333 | rc = send_cmd(afu, cmd); |
c21e0bbf | 334 | if (unlikely(rc)) { |
018d1dc9 | 335 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 336 | cfg->tmf_active = false; |
018d1dc9 | 337 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
338 | goto out; |
339 | } | |
340 | ||
018d1dc9 MO |
341 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
342 | to = msecs_to_jiffies(5000); | |
343 | to = wait_event_interruptible_lock_irq_timeout(cfg->tmf_waitq, | |
344 | !cfg->tmf_active, | |
345 | cfg->tmf_slock, | |
346 | to); | |
347 | if (!to) { | |
348 | cfg->tmf_active = false; | |
349 | dev_err(dev, "%s: TMF timed out!\n", __func__); | |
350 | rc = -1; | |
351 | } | |
352 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); | |
c21e0bbf MO |
353 | out: |
354 | return rc; | |
355 | } | |
356 | ||
b45cdbaf MK |
357 | static void afu_unmap(struct kref *ref) |
358 | { | |
359 | struct afu *afu = container_of(ref, struct afu, mapcount); | |
360 | ||
361 | if (likely(afu->afu_map)) { | |
362 | cxl_psa_unmap((void __iomem *)afu->afu_map); | |
363 | afu->afu_map = NULL; | |
364 | } | |
365 | } | |
366 | ||
c21e0bbf MO |
367 | /** |
368 | * cxlflash_driver_info() - information handler for this host driver | |
369 | * @host: SCSI host associated with device. | |
370 | * | |
371 | * Return: A string describing the device. | |
372 | */ | |
373 | static const char *cxlflash_driver_info(struct Scsi_Host *host) | |
374 | { | |
375 | return CXLFLASH_ADAPTER_NAME; | |
376 | } | |
377 | ||
378 | /** | |
379 | * cxlflash_queuecommand() - sends a mid-layer request | |
380 | * @host: SCSI host associated with device. | |
381 | * @scp: SCSI command to send. | |
382 | * | |
1284fb0c | 383 | * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure |
c21e0bbf MO |
384 | */ |
385 | static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp) | |
386 | { | |
387 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; | |
388 | struct afu *afu = cfg->afu; | |
4392ba49 | 389 | struct device *dev = &cfg->dev->dev; |
5fbb96c8 | 390 | struct afu_cmd *cmd = sc_to_afucz(scp); |
9d89326c | 391 | struct scatterlist *sg = scsi_sglist(scp); |
c21e0bbf | 392 | u32 port_sel = scp->device->channel + 1; |
9d89326c | 393 | u16 req_flags = SISL_REQ_FLAGS_SUP_UNDERRUN; |
c21e0bbf | 394 | ulong lock_flags; |
9d89326c | 395 | int nseg = 0; |
c21e0bbf | 396 | int rc = 0; |
b45cdbaf | 397 | int kref_got = 0; |
c21e0bbf | 398 | |
4392ba49 MO |
399 | dev_dbg_ratelimited(dev, "%s: (scp=%p) %d/%d/%d/%llu " |
400 | "cdb=(%08X-%08X-%08X-%08X)\n", | |
401 | __func__, scp, host->host_no, scp->device->channel, | |
402 | scp->device->id, scp->device->lun, | |
403 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
404 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
405 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
406 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
c21e0bbf | 407 | |
018d1dc9 MO |
408 | /* |
409 | * If a Task Management Function is active, wait for it to complete | |
c21e0bbf MO |
410 | * before continuing with regular commands. |
411 | */ | |
018d1dc9 | 412 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 413 | if (cfg->tmf_active) { |
018d1dc9 | 414 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf MO |
415 | rc = SCSI_MLQUEUE_HOST_BUSY; |
416 | goto out; | |
417 | } | |
018d1dc9 | 418 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 419 | |
5cdac81a | 420 | switch (cfg->state) { |
439e85c1 | 421 | case STATE_RESET: |
4392ba49 | 422 | dev_dbg_ratelimited(dev, "%s: device is in reset!\n", __func__); |
5cdac81a MO |
423 | rc = SCSI_MLQUEUE_HOST_BUSY; |
424 | goto out; | |
425 | case STATE_FAILTERM: | |
4392ba49 | 426 | dev_dbg_ratelimited(dev, "%s: device has failed!\n", __func__); |
5cdac81a MO |
427 | scp->result = (DID_NO_CONNECT << 16); |
428 | scp->scsi_done(scp); | |
429 | rc = 0; | |
430 | goto out; | |
431 | default: | |
432 | break; | |
433 | } | |
434 | ||
b45cdbaf MK |
435 | kref_get(&cfg->afu->mapcount); |
436 | kref_got = 1; | |
437 | ||
9d89326c MO |
438 | if (likely(sg)) { |
439 | nseg = scsi_dma_map(scp); | |
440 | if (unlikely(nseg < 0)) { | |
441 | dev_err(dev, "%s: Fail DMA map!\n", __func__); | |
442 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
443 | goto out; | |
444 | } | |
c21e0bbf | 445 | |
9d89326c MO |
446 | cmd->rcb.data_len = sg_dma_len(sg); |
447 | cmd->rcb.data_ea = sg_dma_address(sg); | |
448 | } | |
c21e0bbf | 449 | |
c21e0bbf | 450 | cmd->rcb.scp = scp; |
5fbb96c8 | 451 | cmd->parent = afu; |
c21e0bbf | 452 | |
9d89326c MO |
453 | cmd->rcb.ctx_id = afu->ctx_hndl; |
454 | cmd->rcb.msi = SISL_MSI_RRQ_UPDATED; | |
455 | cmd->rcb.port_sel = port_sel; | |
456 | cmd->rcb.lun_id = lun_to_lunid(scp->device->lun); | |
c21e0bbf | 457 | |
9d89326c MO |
458 | if (scp->sc_data_direction == DMA_TO_DEVICE) |
459 | req_flags |= SISL_REQ_FLAGS_HOST_WRITE; | |
c21e0bbf | 460 | |
9d89326c | 461 | cmd->rcb.req_flags = req_flags; |
c21e0bbf MO |
462 | memcpy(cmd->rcb.cdb, scp->cmnd, sizeof(cmd->rcb.cdb)); |
463 | ||
15305514 | 464 | rc = send_cmd(afu, cmd); |
5fbb96c8 | 465 | if (unlikely(rc)) |
c21e0bbf | 466 | scsi_dma_unmap(scp); |
c21e0bbf | 467 | out: |
b45cdbaf MK |
468 | if (kref_got) |
469 | kref_put(&afu->mapcount, afu_unmap); | |
4392ba49 | 470 | pr_devel("%s: returning rc=%d\n", __func__, rc); |
c21e0bbf MO |
471 | return rc; |
472 | } | |
473 | ||
474 | /** | |
15305514 | 475 | * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe |
1284fb0c | 476 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 477 | */ |
15305514 | 478 | static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg *cfg) |
c21e0bbf | 479 | { |
15305514 | 480 | struct pci_dev *pdev = cfg->dev; |
c21e0bbf | 481 | |
15305514 MO |
482 | if (pci_channel_offline(pdev)) |
483 | wait_event_timeout(cfg->reset_waitq, | |
484 | !pci_channel_offline(pdev), | |
485 | CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT); | |
c21e0bbf MO |
486 | } |
487 | ||
488 | /** | |
15305514 | 489 | * free_mem() - free memory associated with the AFU |
1284fb0c | 490 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 491 | */ |
15305514 | 492 | static void free_mem(struct cxlflash_cfg *cfg) |
c21e0bbf | 493 | { |
15305514 | 494 | struct afu *afu = cfg->afu; |
c21e0bbf | 495 | |
15305514 | 496 | if (cfg->afu) { |
15305514 MO |
497 | free_pages((ulong)afu, get_order(sizeof(struct afu))); |
498 | cfg->afu = NULL; | |
5cdac81a | 499 | } |
c21e0bbf MO |
500 | } |
501 | ||
502 | /** | |
15305514 | 503 | * stop_afu() - stops the AFU command timers and unmaps the MMIO space |
1284fb0c | 504 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 505 | * |
15305514 | 506 | * Safe to call with AFU in a partially allocated/initialized state. |
ee91e332 | 507 | * |
de01283b | 508 | * Waits for any active internal AFU commands to timeout and then unmaps |
ee91e332 | 509 | * the MMIO space. |
c21e0bbf | 510 | */ |
15305514 | 511 | static void stop_afu(struct cxlflash_cfg *cfg) |
c21e0bbf | 512 | { |
15305514 | 513 | struct afu *afu = cfg->afu; |
c21e0bbf | 514 | |
15305514 | 515 | if (likely(afu)) { |
de01283b MO |
516 | while (atomic_read(&afu->cmds_active)) |
517 | ssleep(1); | |
c21e0bbf | 518 | if (likely(afu->afu_map)) { |
1786f4a0 | 519 | cxl_psa_unmap((void __iomem *)afu->afu_map); |
c21e0bbf MO |
520 | afu->afu_map = NULL; |
521 | } | |
b45cdbaf | 522 | kref_put(&afu->mapcount, afu_unmap); |
c21e0bbf MO |
523 | } |
524 | } | |
525 | ||
526 | /** | |
9526f360 | 527 | * term_intr() - disables all AFU interrupts |
1284fb0c | 528 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
529 | * @level: Depth of allocation, where to begin waterfall tear down. |
530 | * | |
531 | * Safe to call with AFU/MC in partially allocated/initialized state. | |
532 | */ | |
9526f360 | 533 | static void term_intr(struct cxlflash_cfg *cfg, enum undo_level level) |
c21e0bbf | 534 | { |
c21e0bbf | 535 | struct afu *afu = cfg->afu; |
4392ba49 | 536 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
537 | |
538 | if (!afu || !cfg->mcctx) { | |
9526f360 | 539 | dev_err(dev, "%s: returning with NULL afu or MC\n", __func__); |
c21e0bbf MO |
540 | return; |
541 | } | |
542 | ||
543 | switch (level) { | |
c21e0bbf MO |
544 | case UNMAP_THREE: |
545 | cxl_unmap_afu_irq(cfg->mcctx, 3, afu); | |
546 | case UNMAP_TWO: | |
547 | cxl_unmap_afu_irq(cfg->mcctx, 2, afu); | |
548 | case UNMAP_ONE: | |
549 | cxl_unmap_afu_irq(cfg->mcctx, 1, afu); | |
550 | case FREE_IRQ: | |
551 | cxl_free_afu_irqs(cfg->mcctx); | |
9526f360 MK |
552 | /* fall through */ |
553 | case UNDO_NOOP: | |
554 | /* No action required */ | |
555 | break; | |
556 | } | |
557 | } | |
558 | ||
559 | /** | |
560 | * term_mc() - terminates the master context | |
561 | * @cfg: Internal structure associated with the host. | |
562 | * @level: Depth of allocation, where to begin waterfall tear down. | |
563 | * | |
564 | * Safe to call with AFU/MC in partially allocated/initialized state. | |
565 | */ | |
566 | static void term_mc(struct cxlflash_cfg *cfg) | |
567 | { | |
568 | int rc = 0; | |
569 | struct afu *afu = cfg->afu; | |
570 | struct device *dev = &cfg->dev->dev; | |
571 | ||
572 | if (!afu || !cfg->mcctx) { | |
573 | dev_err(dev, "%s: returning with NULL afu or MC\n", __func__); | |
574 | return; | |
c21e0bbf | 575 | } |
9526f360 MK |
576 | |
577 | rc = cxl_stop_context(cfg->mcctx); | |
578 | WARN_ON(rc); | |
579 | cfg->mcctx = NULL; | |
c21e0bbf MO |
580 | } |
581 | ||
582 | /** | |
583 | * term_afu() - terminates the AFU | |
1284fb0c | 584 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
585 | * |
586 | * Safe to call with AFU/MC in partially allocated/initialized state. | |
587 | */ | |
588 | static void term_afu(struct cxlflash_cfg *cfg) | |
589 | { | |
9526f360 MK |
590 | /* |
591 | * Tear down is carefully orchestrated to ensure | |
592 | * no interrupts can come in when the problem state | |
593 | * area is unmapped. | |
594 | * | |
595 | * 1) Disable all AFU interrupts | |
596 | * 2) Unmap the problem state area | |
597 | * 3) Stop the master context | |
598 | */ | |
599 | term_intr(cfg, UNMAP_THREE); | |
c21e0bbf MO |
600 | if (cfg->afu) |
601 | stop_afu(cfg); | |
602 | ||
9526f360 | 603 | term_mc(cfg); |
6ded8b3c | 604 | |
c21e0bbf MO |
605 | pr_debug("%s: returning\n", __func__); |
606 | } | |
607 | ||
704c4b0d UK |
608 | /** |
609 | * notify_shutdown() - notifies device of pending shutdown | |
610 | * @cfg: Internal structure associated with the host. | |
611 | * @wait: Whether to wait for shutdown processing to complete. | |
612 | * | |
613 | * This function will notify the AFU that the adapter is being shutdown | |
614 | * and will wait for shutdown processing to complete if wait is true. | |
615 | * This notification should flush pending I/Os to the device and halt | |
616 | * further I/Os until the next AFU reset is issued and device restarted. | |
617 | */ | |
618 | static void notify_shutdown(struct cxlflash_cfg *cfg, bool wait) | |
619 | { | |
620 | struct afu *afu = cfg->afu; | |
621 | struct device *dev = &cfg->dev->dev; | |
1bd2b282 | 622 | struct sisl_global_map __iomem *global; |
704c4b0d UK |
623 | struct dev_dependent_vals *ddv; |
624 | u64 reg, status; | |
625 | int i, retry_cnt = 0; | |
626 | ||
627 | ddv = (struct dev_dependent_vals *)cfg->dev_id->driver_data; | |
628 | if (!(ddv->flags & CXLFLASH_NOTIFY_SHUTDOWN)) | |
629 | return; | |
630 | ||
1bd2b282 UK |
631 | if (!afu || !afu->afu_map) { |
632 | dev_dbg(dev, "%s: The problem state area is not mapped\n", | |
633 | __func__); | |
634 | return; | |
635 | } | |
636 | ||
637 | global = &afu->afu_map->global; | |
638 | ||
704c4b0d UK |
639 | /* Notify AFU */ |
640 | for (i = 0; i < NUM_FC_PORTS; i++) { | |
641 | reg = readq_be(&global->fc_regs[i][FC_CONFIG2 / 8]); | |
642 | reg |= SISL_FC_SHUTDOWN_NORMAL; | |
643 | writeq_be(reg, &global->fc_regs[i][FC_CONFIG2 / 8]); | |
644 | } | |
645 | ||
646 | if (!wait) | |
647 | return; | |
648 | ||
649 | /* Wait up to 1.5 seconds for shutdown processing to complete */ | |
650 | for (i = 0; i < NUM_FC_PORTS; i++) { | |
651 | retry_cnt = 0; | |
652 | while (true) { | |
653 | status = readq_be(&global->fc_regs[i][FC_STATUS / 8]); | |
654 | if (status & SISL_STATUS_SHUTDOWN_COMPLETE) | |
655 | break; | |
656 | if (++retry_cnt >= MC_RETRY_CNT) { | |
657 | dev_dbg(dev, "%s: port %d shutdown processing " | |
658 | "not yet completed\n", __func__, i); | |
659 | break; | |
660 | } | |
661 | msleep(100 * retry_cnt); | |
662 | } | |
663 | } | |
664 | } | |
665 | ||
c21e0bbf MO |
666 | /** |
667 | * cxlflash_remove() - PCI entry point to tear down host | |
668 | * @pdev: PCI device associated with the host. | |
669 | * | |
670 | * Safe to use as a cleanup in partially allocated/initialized state. | |
671 | */ | |
672 | static void cxlflash_remove(struct pci_dev *pdev) | |
673 | { | |
674 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); | |
675 | ulong lock_flags; | |
676 | ||
babf985d UK |
677 | if (!pci_is_enabled(pdev)) { |
678 | pr_debug("%s: Device is disabled\n", __func__); | |
679 | return; | |
680 | } | |
681 | ||
c21e0bbf MO |
682 | /* If a Task Management Function is active, wait for it to complete |
683 | * before continuing with remove. | |
684 | */ | |
018d1dc9 | 685 | spin_lock_irqsave(&cfg->tmf_slock, lock_flags); |
c21e0bbf | 686 | if (cfg->tmf_active) |
018d1dc9 MO |
687 | wait_event_interruptible_lock_irq(cfg->tmf_waitq, |
688 | !cfg->tmf_active, | |
689 | cfg->tmf_slock); | |
690 | spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); | |
c21e0bbf | 691 | |
704c4b0d UK |
692 | /* Notify AFU and wait for shutdown processing to complete */ |
693 | notify_shutdown(cfg, true); | |
694 | ||
5cdac81a | 695 | cfg->state = STATE_FAILTERM; |
65be2c79 | 696 | cxlflash_stop_term_user_contexts(cfg); |
5cdac81a | 697 | |
c21e0bbf MO |
698 | switch (cfg->init_state) { |
699 | case INIT_STATE_SCSI: | |
65be2c79 | 700 | cxlflash_term_local_luns(cfg); |
c21e0bbf | 701 | scsi_remove_host(cfg->host); |
f15fbf8d | 702 | /* fall through */ |
c21e0bbf | 703 | case INIT_STATE_AFU: |
d804621d | 704 | cancel_work_sync(&cfg->work_q); |
b45cdbaf | 705 | term_afu(cfg); |
c21e0bbf | 706 | case INIT_STATE_PCI: |
c21e0bbf MO |
707 | pci_disable_device(pdev); |
708 | case INIT_STATE_NONE: | |
c21e0bbf | 709 | free_mem(cfg); |
8b5b1e87 | 710 | scsi_host_put(cfg->host); |
c21e0bbf MO |
711 | break; |
712 | } | |
713 | ||
714 | pr_debug("%s: returning\n", __func__); | |
715 | } | |
716 | ||
717 | /** | |
718 | * alloc_mem() - allocates the AFU and its command pool | |
1284fb0c | 719 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
720 | * |
721 | * A partially allocated state remains on failure. | |
722 | * | |
723 | * Return: | |
724 | * 0 on success | |
725 | * -ENOMEM on failure to allocate memory | |
726 | */ | |
727 | static int alloc_mem(struct cxlflash_cfg *cfg) | |
728 | { | |
729 | int rc = 0; | |
4392ba49 | 730 | struct device *dev = &cfg->dev->dev; |
c21e0bbf | 731 | |
f15fbf8d | 732 | /* AFU is ~12k, i.e. only one 64k page or up to four 4k pages */ |
c21e0bbf MO |
733 | cfg->afu = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, |
734 | get_order(sizeof(struct afu))); | |
735 | if (unlikely(!cfg->afu)) { | |
4392ba49 MO |
736 | dev_err(dev, "%s: cannot get %d free pages\n", |
737 | __func__, get_order(sizeof(struct afu))); | |
c21e0bbf MO |
738 | rc = -ENOMEM; |
739 | goto out; | |
740 | } | |
741 | cfg->afu->parent = cfg; | |
742 | cfg->afu->afu_map = NULL; | |
c21e0bbf MO |
743 | out: |
744 | return rc; | |
745 | } | |
746 | ||
747 | /** | |
748 | * init_pci() - initializes the host as a PCI device | |
1284fb0c | 749 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 750 | * |
1284fb0c | 751 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
752 | */ |
753 | static int init_pci(struct cxlflash_cfg *cfg) | |
754 | { | |
755 | struct pci_dev *pdev = cfg->dev; | |
756 | int rc = 0; | |
757 | ||
c21e0bbf MO |
758 | rc = pci_enable_device(pdev); |
759 | if (rc || pci_channel_offline(pdev)) { | |
760 | if (pci_channel_offline(pdev)) { | |
761 | cxlflash_wait_for_pci_err_recovery(cfg); | |
762 | rc = pci_enable_device(pdev); | |
763 | } | |
764 | ||
765 | if (rc) { | |
766 | dev_err(&pdev->dev, "%s: Cannot enable adapter\n", | |
767 | __func__); | |
768 | cxlflash_wait_for_pci_err_recovery(cfg); | |
961487e4 | 769 | goto out; |
c21e0bbf MO |
770 | } |
771 | } | |
772 | ||
c21e0bbf MO |
773 | out: |
774 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
775 | return rc; | |
c21e0bbf MO |
776 | } |
777 | ||
778 | /** | |
779 | * init_scsi() - adds the host to the SCSI stack and kicks off host scan | |
1284fb0c | 780 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 781 | * |
1284fb0c | 782 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
783 | */ |
784 | static int init_scsi(struct cxlflash_cfg *cfg) | |
785 | { | |
786 | struct pci_dev *pdev = cfg->dev; | |
787 | int rc = 0; | |
788 | ||
789 | rc = scsi_add_host(cfg->host, &pdev->dev); | |
790 | if (rc) { | |
791 | dev_err(&pdev->dev, "%s: scsi_add_host failed (rc=%d)\n", | |
792 | __func__, rc); | |
793 | goto out; | |
794 | } | |
795 | ||
796 | scsi_scan_host(cfg->host); | |
797 | ||
798 | out: | |
799 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
800 | return rc; | |
801 | } | |
802 | ||
803 | /** | |
804 | * set_port_online() - transitions the specified host FC port to online state | |
805 | * @fc_regs: Top of MMIO region defined for specified port. | |
806 | * | |
807 | * The provided MMIO region must be mapped prior to call. Online state means | |
808 | * that the FC link layer has synced, completed the handshaking process, and | |
809 | * is ready for login to start. | |
810 | */ | |
1786f4a0 | 811 | static void set_port_online(__be64 __iomem *fc_regs) |
c21e0bbf MO |
812 | { |
813 | u64 cmdcfg; | |
814 | ||
815 | cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
816 | cmdcfg &= (~FC_MTIP_CMDCONFIG_OFFLINE); /* clear OFF_LINE */ | |
817 | cmdcfg |= (FC_MTIP_CMDCONFIG_ONLINE); /* set ON_LINE */ | |
818 | writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
819 | } | |
820 | ||
821 | /** | |
822 | * set_port_offline() - transitions the specified host FC port to offline state | |
823 | * @fc_regs: Top of MMIO region defined for specified port. | |
824 | * | |
825 | * The provided MMIO region must be mapped prior to call. | |
826 | */ | |
1786f4a0 | 827 | static void set_port_offline(__be64 __iomem *fc_regs) |
c21e0bbf MO |
828 | { |
829 | u64 cmdcfg; | |
830 | ||
831 | cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
832 | cmdcfg &= (~FC_MTIP_CMDCONFIG_ONLINE); /* clear ON_LINE */ | |
833 | cmdcfg |= (FC_MTIP_CMDCONFIG_OFFLINE); /* set OFF_LINE */ | |
834 | writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); | |
835 | } | |
836 | ||
837 | /** | |
838 | * wait_port_online() - waits for the specified host FC port come online | |
839 | * @fc_regs: Top of MMIO region defined for specified port. | |
840 | * @delay_us: Number of microseconds to delay between reading port status. | |
841 | * @nretry: Number of cycles to retry reading port status. | |
842 | * | |
843 | * The provided MMIO region must be mapped prior to call. This will timeout | |
844 | * when the cable is not plugged in. | |
845 | * | |
846 | * Return: | |
847 | * TRUE (1) when the specified port is online | |
848 | * FALSE (0) when the specified port fails to come online after timeout | |
849 | * -EINVAL when @delay_us is less than 1000 | |
850 | */ | |
1786f4a0 | 851 | static int wait_port_online(__be64 __iomem *fc_regs, u32 delay_us, u32 nretry) |
c21e0bbf MO |
852 | { |
853 | u64 status; | |
854 | ||
855 | if (delay_us < 1000) { | |
856 | pr_err("%s: invalid delay specified %d\n", __func__, delay_us); | |
857 | return -EINVAL; | |
858 | } | |
859 | ||
860 | do { | |
861 | msleep(delay_us / 1000); | |
862 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); | |
05dab432 MO |
863 | if (status == U64_MAX) |
864 | nretry /= 2; | |
c21e0bbf MO |
865 | } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_ONLINE && |
866 | nretry--); | |
867 | ||
868 | return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_ONLINE); | |
869 | } | |
870 | ||
871 | /** | |
872 | * wait_port_offline() - waits for the specified host FC port go offline | |
873 | * @fc_regs: Top of MMIO region defined for specified port. | |
874 | * @delay_us: Number of microseconds to delay between reading port status. | |
875 | * @nretry: Number of cycles to retry reading port status. | |
876 | * | |
877 | * The provided MMIO region must be mapped prior to call. | |
878 | * | |
879 | * Return: | |
880 | * TRUE (1) when the specified port is offline | |
881 | * FALSE (0) when the specified port fails to go offline after timeout | |
882 | * -EINVAL when @delay_us is less than 1000 | |
883 | */ | |
1786f4a0 | 884 | static int wait_port_offline(__be64 __iomem *fc_regs, u32 delay_us, u32 nretry) |
c21e0bbf MO |
885 | { |
886 | u64 status; | |
887 | ||
888 | if (delay_us < 1000) { | |
889 | pr_err("%s: invalid delay specified %d\n", __func__, delay_us); | |
890 | return -EINVAL; | |
891 | } | |
892 | ||
893 | do { | |
894 | msleep(delay_us / 1000); | |
895 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); | |
05dab432 MO |
896 | if (status == U64_MAX) |
897 | nretry /= 2; | |
c21e0bbf MO |
898 | } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_OFFLINE && |
899 | nretry--); | |
900 | ||
901 | return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_OFFLINE); | |
902 | } | |
903 | ||
904 | /** | |
905 | * afu_set_wwpn() - configures the WWPN for the specified host FC port | |
906 | * @afu: AFU associated with the host that owns the specified FC port. | |
907 | * @port: Port number being configured. | |
908 | * @fc_regs: Top of MMIO region defined for specified port. | |
909 | * @wwpn: The world-wide-port-number previously discovered for port. | |
910 | * | |
911 | * The provided MMIO region must be mapped prior to call. As part of the | |
912 | * sequence to configure the WWPN, the port is toggled offline and then back | |
913 | * online. This toggling action can cause this routine to delay up to a few | |
914 | * seconds. When configured to use the internal LUN feature of the AFU, a | |
915 | * failure to come online is overridden. | |
c21e0bbf | 916 | */ |
f8013261 MO |
917 | static void afu_set_wwpn(struct afu *afu, int port, __be64 __iomem *fc_regs, |
918 | u64 wwpn) | |
c21e0bbf | 919 | { |
c21e0bbf | 920 | set_port_offline(fc_regs); |
c21e0bbf MO |
921 | if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, |
922 | FC_PORT_STATUS_RETRY_CNT)) { | |
923 | pr_debug("%s: wait on port %d to go offline timed out\n", | |
924 | __func__, port); | |
c21e0bbf MO |
925 | } |
926 | ||
f8013261 | 927 | writeq_be(wwpn, &fc_regs[FC_PNAME / 8]); |
964497b3 | 928 | |
c21e0bbf | 929 | set_port_online(fc_regs); |
c21e0bbf MO |
930 | if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, |
931 | FC_PORT_STATUS_RETRY_CNT)) { | |
f8013261 MO |
932 | pr_debug("%s: wait on port %d to go online timed out\n", |
933 | __func__, port); | |
c21e0bbf | 934 | } |
c21e0bbf MO |
935 | } |
936 | ||
937 | /** | |
938 | * afu_link_reset() - resets the specified host FC port | |
939 | * @afu: AFU associated with the host that owns the specified FC port. | |
940 | * @port: Port number being configured. | |
941 | * @fc_regs: Top of MMIO region defined for specified port. | |
942 | * | |
943 | * The provided MMIO region must be mapped prior to call. The sequence to | |
944 | * reset the port involves toggling it offline and then back online. This | |
945 | * action can cause this routine to delay up to a few seconds. An effort | |
946 | * is made to maintain link with the device by switching to host to use | |
947 | * the alternate port exclusively while the reset takes place. | |
948 | * failure to come online is overridden. | |
949 | */ | |
1786f4a0 | 950 | static void afu_link_reset(struct afu *afu, int port, __be64 __iomem *fc_regs) |
c21e0bbf MO |
951 | { |
952 | u64 port_sel; | |
953 | ||
954 | /* first switch the AFU to the other links, if any */ | |
955 | port_sel = readq_be(&afu->afu_map->global.regs.afu_port_sel); | |
4da74db0 | 956 | port_sel &= ~(1ULL << port); |
c21e0bbf MO |
957 | writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); |
958 | cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); | |
959 | ||
960 | set_port_offline(fc_regs); | |
961 | if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
962 | FC_PORT_STATUS_RETRY_CNT)) | |
963 | pr_err("%s: wait on port %d to go offline timed out\n", | |
964 | __func__, port); | |
965 | ||
966 | set_port_online(fc_regs); | |
967 | if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, | |
968 | FC_PORT_STATUS_RETRY_CNT)) | |
969 | pr_err("%s: wait on port %d to go online timed out\n", | |
970 | __func__, port); | |
971 | ||
972 | /* switch back to include this port */ | |
4da74db0 | 973 | port_sel |= (1ULL << port); |
c21e0bbf MO |
974 | writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); |
975 | cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); | |
976 | ||
977 | pr_debug("%s: returning port_sel=%lld\n", __func__, port_sel); | |
978 | } | |
979 | ||
980 | /* | |
981 | * Asynchronous interrupt information table | |
982 | */ | |
983 | static const struct asyc_intr_info ainfo[] = { | |
984 | {SISL_ASTATUS_FC0_OTHER, "other error", 0, CLR_FC_ERROR | LINK_RESET}, | |
985 | {SISL_ASTATUS_FC0_LOGO, "target initiated LOGO", 0, 0}, | |
986 | {SISL_ASTATUS_FC0_CRC_T, "CRC threshold exceeded", 0, LINK_RESET}, | |
e6e6df3f | 987 | {SISL_ASTATUS_FC0_LOGI_R, "login timed out, retrying", 0, LINK_RESET}, |
c21e0bbf | 988 | {SISL_ASTATUS_FC0_LOGI_F, "login failed", 0, CLR_FC_ERROR}, |
ef51074a | 989 | {SISL_ASTATUS_FC0_LOGI_S, "login succeeded", 0, SCAN_HOST}, |
c21e0bbf | 990 | {SISL_ASTATUS_FC0_LINK_DN, "link down", 0, 0}, |
bbbfae96 | 991 | {SISL_ASTATUS_FC0_LINK_UP, "link up", 0, 0}, |
c21e0bbf MO |
992 | {SISL_ASTATUS_FC1_OTHER, "other error", 1, CLR_FC_ERROR | LINK_RESET}, |
993 | {SISL_ASTATUS_FC1_LOGO, "target initiated LOGO", 1, 0}, | |
994 | {SISL_ASTATUS_FC1_CRC_T, "CRC threshold exceeded", 1, LINK_RESET}, | |
a9be294e | 995 | {SISL_ASTATUS_FC1_LOGI_R, "login timed out, retrying", 1, LINK_RESET}, |
c21e0bbf | 996 | {SISL_ASTATUS_FC1_LOGI_F, "login failed", 1, CLR_FC_ERROR}, |
ef51074a | 997 | {SISL_ASTATUS_FC1_LOGI_S, "login succeeded", 1, SCAN_HOST}, |
c21e0bbf | 998 | {SISL_ASTATUS_FC1_LINK_DN, "link down", 1, 0}, |
bbbfae96 | 999 | {SISL_ASTATUS_FC1_LINK_UP, "link up", 1, 0}, |
c21e0bbf MO |
1000 | {0x0, "", 0, 0} /* terminator */ |
1001 | }; | |
1002 | ||
1003 | /** | |
1004 | * find_ainfo() - locates and returns asynchronous interrupt information | |
1005 | * @status: Status code set by AFU on error. | |
1006 | * | |
1007 | * Return: The located information or NULL when the status code is invalid. | |
1008 | */ | |
1009 | static const struct asyc_intr_info *find_ainfo(u64 status) | |
1010 | { | |
1011 | const struct asyc_intr_info *info; | |
1012 | ||
1013 | for (info = &ainfo[0]; info->status; info++) | |
1014 | if (info->status == status) | |
1015 | return info; | |
1016 | ||
1017 | return NULL; | |
1018 | } | |
1019 | ||
1020 | /** | |
1021 | * afu_err_intr_init() - clears and initializes the AFU for error interrupts | |
1022 | * @afu: AFU associated with the host. | |
1023 | */ | |
1024 | static void afu_err_intr_init(struct afu *afu) | |
1025 | { | |
1026 | int i; | |
1027 | u64 reg; | |
1028 | ||
1029 | /* global async interrupts: AFU clears afu_ctrl on context exit | |
1030 | * if async interrupts were sent to that context. This prevents | |
1031 | * the AFU form sending further async interrupts when | |
1032 | * there is | |
1033 | * nobody to receive them. | |
1034 | */ | |
1035 | ||
1036 | /* mask all */ | |
1037 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_mask); | |
1038 | /* set LISN# to send and point to master context */ | |
1039 | reg = ((u64) (((afu->ctx_hndl << 8) | SISL_MSI_ASYNC_ERROR)) << 40); | |
1040 | ||
1041 | if (afu->internal_lun) | |
1042 | reg |= 1; /* Bit 63 indicates local lun */ | |
1043 | writeq_be(reg, &afu->afu_map->global.regs.afu_ctrl); | |
1044 | /* clear all */ | |
1045 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); | |
1046 | /* unmask bits that are of interest */ | |
1047 | /* note: afu can send an interrupt after this step */ | |
1048 | writeq_be(SISL_ASTATUS_MASK, &afu->afu_map->global.regs.aintr_mask); | |
1049 | /* clear again in case a bit came on after previous clear but before */ | |
1050 | /* unmask */ | |
1051 | writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); | |
1052 | ||
1053 | /* Clear/Set internal lun bits */ | |
1054 | reg = readq_be(&afu->afu_map->global.fc_regs[0][FC_CONFIG2 / 8]); | |
1055 | reg &= SISL_FC_INTERNAL_MASK; | |
1056 | if (afu->internal_lun) | |
1057 | reg |= ((u64)(afu->internal_lun - 1) << SISL_FC_INTERNAL_SHIFT); | |
1058 | writeq_be(reg, &afu->afu_map->global.fc_regs[0][FC_CONFIG2 / 8]); | |
1059 | ||
1060 | /* now clear FC errors */ | |
1061 | for (i = 0; i < NUM_FC_PORTS; i++) { | |
1062 | writeq_be(0xFFFFFFFFU, | |
1063 | &afu->afu_map->global.fc_regs[i][FC_ERROR / 8]); | |
1064 | writeq_be(0, &afu->afu_map->global.fc_regs[i][FC_ERRCAP / 8]); | |
1065 | } | |
1066 | ||
1067 | /* sync interrupts for master's IOARRIN write */ | |
1068 | /* note that unlike asyncs, there can be no pending sync interrupts */ | |
1069 | /* at this time (this is a fresh context and master has not written */ | |
1070 | /* IOARRIN yet), so there is nothing to clear. */ | |
1071 | ||
1072 | /* set LISN#, it is always sent to the context that wrote IOARRIN */ | |
1073 | writeq_be(SISL_MSI_SYNC_ERROR, &afu->host_map->ctx_ctrl); | |
1074 | writeq_be(SISL_ISTATUS_MASK, &afu->host_map->intr_mask); | |
1075 | } | |
1076 | ||
1077 | /** | |
1078 | * cxlflash_sync_err_irq() - interrupt handler for synchronous errors | |
1079 | * @irq: Interrupt number. | |
1080 | * @data: Private data provided at interrupt registration, the AFU. | |
1081 | * | |
1082 | * Return: Always return IRQ_HANDLED. | |
1083 | */ | |
1084 | static irqreturn_t cxlflash_sync_err_irq(int irq, void *data) | |
1085 | { | |
1086 | struct afu *afu = (struct afu *)data; | |
1087 | u64 reg; | |
1088 | u64 reg_unmasked; | |
1089 | ||
1090 | reg = readq_be(&afu->host_map->intr_status); | |
1091 | reg_unmasked = (reg & SISL_ISTATUS_UNMASK); | |
1092 | ||
1093 | if (reg_unmasked == 0UL) { | |
1094 | pr_err("%s: %llX: spurious interrupt, intr_status %016llX\n", | |
1095 | __func__, (u64)afu, reg); | |
1096 | goto cxlflash_sync_err_irq_exit; | |
1097 | } | |
1098 | ||
1099 | pr_err("%s: %llX: unexpected interrupt, intr_status %016llX\n", | |
1100 | __func__, (u64)afu, reg); | |
1101 | ||
1102 | writeq_be(reg_unmasked, &afu->host_map->intr_clear); | |
1103 | ||
1104 | cxlflash_sync_err_irq_exit: | |
1105 | pr_debug("%s: returning rc=%d\n", __func__, IRQ_HANDLED); | |
1106 | return IRQ_HANDLED; | |
1107 | } | |
1108 | ||
1109 | /** | |
1110 | * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path) | |
1111 | * @irq: Interrupt number. | |
1112 | * @data: Private data provided at interrupt registration, the AFU. | |
1113 | * | |
1114 | * Return: Always return IRQ_HANDLED. | |
1115 | */ | |
1116 | static irqreturn_t cxlflash_rrq_irq(int irq, void *data) | |
1117 | { | |
1118 | struct afu *afu = (struct afu *)data; | |
1119 | struct afu_cmd *cmd; | |
1120 | bool toggle = afu->toggle; | |
1121 | u64 entry, | |
1122 | *hrrq_start = afu->hrrq_start, | |
1123 | *hrrq_end = afu->hrrq_end, | |
1124 | *hrrq_curr = afu->hrrq_curr; | |
1125 | ||
1126 | /* Process however many RRQ entries that are ready */ | |
1127 | while (true) { | |
1128 | entry = *hrrq_curr; | |
1129 | ||
1130 | if ((entry & SISL_RESP_HANDLE_T_BIT) != toggle) | |
1131 | break; | |
1132 | ||
1133 | cmd = (struct afu_cmd *)(entry & ~SISL_RESP_HANDLE_T_BIT); | |
1134 | cmd_complete(cmd); | |
1135 | ||
1136 | /* Advance to next entry or wrap and flip the toggle bit */ | |
1137 | if (hrrq_curr < hrrq_end) | |
1138 | hrrq_curr++; | |
1139 | else { | |
1140 | hrrq_curr = hrrq_start; | |
1141 | toggle ^= SISL_RESP_HANDLE_T_BIT; | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | afu->hrrq_curr = hrrq_curr; | |
1146 | afu->toggle = toggle; | |
1147 | ||
1148 | return IRQ_HANDLED; | |
1149 | } | |
1150 | ||
1151 | /** | |
1152 | * cxlflash_async_err_irq() - interrupt handler for asynchronous errors | |
1153 | * @irq: Interrupt number. | |
1154 | * @data: Private data provided at interrupt registration, the AFU. | |
1155 | * | |
1156 | * Return: Always return IRQ_HANDLED. | |
1157 | */ | |
1158 | static irqreturn_t cxlflash_async_err_irq(int irq, void *data) | |
1159 | { | |
1160 | struct afu *afu = (struct afu *)data; | |
4392ba49 MO |
1161 | struct cxlflash_cfg *cfg = afu->parent; |
1162 | struct device *dev = &cfg->dev->dev; | |
c21e0bbf MO |
1163 | u64 reg_unmasked; |
1164 | const struct asyc_intr_info *info; | |
1786f4a0 | 1165 | struct sisl_global_map __iomem *global = &afu->afu_map->global; |
c21e0bbf MO |
1166 | u64 reg; |
1167 | u8 port; | |
1168 | int i; | |
1169 | ||
c21e0bbf MO |
1170 | reg = readq_be(&global->regs.aintr_status); |
1171 | reg_unmasked = (reg & SISL_ASTATUS_UNMASK); | |
1172 | ||
1173 | if (reg_unmasked == 0) { | |
4392ba49 MO |
1174 | dev_err(dev, "%s: spurious interrupt, aintr_status 0x%016llX\n", |
1175 | __func__, reg); | |
c21e0bbf MO |
1176 | goto out; |
1177 | } | |
1178 | ||
f15fbf8d | 1179 | /* FYI, it is 'okay' to clear AFU status before FC_ERROR */ |
c21e0bbf MO |
1180 | writeq_be(reg_unmasked, &global->regs.aintr_clear); |
1181 | ||
f15fbf8d | 1182 | /* Check each bit that is on */ |
c21e0bbf MO |
1183 | for (i = 0; reg_unmasked; i++, reg_unmasked = (reg_unmasked >> 1)) { |
1184 | info = find_ainfo(1ULL << i); | |
16798d34 | 1185 | if (((reg_unmasked & 0x1) == 0) || !info) |
c21e0bbf MO |
1186 | continue; |
1187 | ||
1188 | port = info->port; | |
1189 | ||
4392ba49 MO |
1190 | dev_err(dev, "%s: FC Port %d -> %s, fc_status 0x%08llX\n", |
1191 | __func__, port, info->desc, | |
c21e0bbf MO |
1192 | readq_be(&global->fc_regs[port][FC_STATUS / 8])); |
1193 | ||
1194 | /* | |
f15fbf8d | 1195 | * Do link reset first, some OTHER errors will set FC_ERROR |
c21e0bbf MO |
1196 | * again if cleared before or w/o a reset |
1197 | */ | |
1198 | if (info->action & LINK_RESET) { | |
4392ba49 MO |
1199 | dev_err(dev, "%s: FC Port %d: resetting link\n", |
1200 | __func__, port); | |
c21e0bbf MO |
1201 | cfg->lr_state = LINK_RESET_REQUIRED; |
1202 | cfg->lr_port = port; | |
b45cdbaf | 1203 | kref_get(&cfg->afu->mapcount); |
c21e0bbf MO |
1204 | schedule_work(&cfg->work_q); |
1205 | } | |
1206 | ||
1207 | if (info->action & CLR_FC_ERROR) { | |
1208 | reg = readq_be(&global->fc_regs[port][FC_ERROR / 8]); | |
1209 | ||
1210 | /* | |
f15fbf8d | 1211 | * Since all errors are unmasked, FC_ERROR and FC_ERRCAP |
c21e0bbf MO |
1212 | * should be the same and tracing one is sufficient. |
1213 | */ | |
1214 | ||
4392ba49 MO |
1215 | dev_err(dev, "%s: fc %d: clearing fc_error 0x%08llX\n", |
1216 | __func__, port, reg); | |
c21e0bbf MO |
1217 | |
1218 | writeq_be(reg, &global->fc_regs[port][FC_ERROR / 8]); | |
1219 | writeq_be(0, &global->fc_regs[port][FC_ERRCAP / 8]); | |
1220 | } | |
ef51074a MO |
1221 | |
1222 | if (info->action & SCAN_HOST) { | |
1223 | atomic_inc(&cfg->scan_host_needed); | |
b45cdbaf | 1224 | kref_get(&cfg->afu->mapcount); |
ef51074a MO |
1225 | schedule_work(&cfg->work_q); |
1226 | } | |
c21e0bbf MO |
1227 | } |
1228 | ||
1229 | out: | |
4392ba49 | 1230 | dev_dbg(dev, "%s: returning IRQ_HANDLED, afu=%p\n", __func__, afu); |
c21e0bbf MO |
1231 | return IRQ_HANDLED; |
1232 | } | |
1233 | ||
1234 | /** | |
1235 | * start_context() - starts the master context | |
1284fb0c | 1236 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1237 | * |
1238 | * Return: A success or failure value from CXL services. | |
1239 | */ | |
1240 | static int start_context(struct cxlflash_cfg *cfg) | |
1241 | { | |
1242 | int rc = 0; | |
1243 | ||
1244 | rc = cxl_start_context(cfg->mcctx, | |
1245 | cfg->afu->work.work_element_descriptor, | |
1246 | NULL); | |
1247 | ||
1248 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1249 | return rc; | |
1250 | } | |
1251 | ||
1252 | /** | |
1253 | * read_vpd() - obtains the WWPNs from VPD | |
1284fb0c | 1254 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1255 | * @wwpn: Array of size NUM_FC_PORTS to pass back WWPNs |
1256 | * | |
1284fb0c | 1257 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
1258 | */ |
1259 | static int read_vpd(struct cxlflash_cfg *cfg, u64 wwpn[]) | |
1260 | { | |
ca946d4e | 1261 | struct pci_dev *dev = cfg->dev; |
c21e0bbf MO |
1262 | int rc = 0; |
1263 | int ro_start, ro_size, i, j, k; | |
1264 | ssize_t vpd_size; | |
1265 | char vpd_data[CXLFLASH_VPD_LEN]; | |
1266 | char tmp_buf[WWPN_BUF_LEN] = { 0 }; | |
1267 | char *wwpn_vpd_tags[NUM_FC_PORTS] = { "V5", "V6" }; | |
1268 | ||
1269 | /* Get the VPD data from the device */ | |
ca946d4e | 1270 | vpd_size = cxl_read_adapter_vpd(dev, vpd_data, sizeof(vpd_data)); |
c21e0bbf | 1271 | if (unlikely(vpd_size <= 0)) { |
4392ba49 | 1272 | dev_err(&dev->dev, "%s: Unable to read VPD (size = %ld)\n", |
c21e0bbf MO |
1273 | __func__, vpd_size); |
1274 | rc = -ENODEV; | |
1275 | goto out; | |
1276 | } | |
1277 | ||
1278 | /* Get the read only section offset */ | |
1279 | ro_start = pci_vpd_find_tag(vpd_data, 0, vpd_size, | |
1280 | PCI_VPD_LRDT_RO_DATA); | |
1281 | if (unlikely(ro_start < 0)) { | |
4392ba49 MO |
1282 | dev_err(&dev->dev, "%s: VPD Read-only data not found\n", |
1283 | __func__); | |
c21e0bbf MO |
1284 | rc = -ENODEV; |
1285 | goto out; | |
1286 | } | |
1287 | ||
1288 | /* Get the read only section size, cap when extends beyond read VPD */ | |
1289 | ro_size = pci_vpd_lrdt_size(&vpd_data[ro_start]); | |
1290 | j = ro_size; | |
1291 | i = ro_start + PCI_VPD_LRDT_TAG_SIZE; | |
1292 | if (unlikely((i + j) > vpd_size)) { | |
1293 | pr_debug("%s: Might need to read more VPD (%d > %ld)\n", | |
1294 | __func__, (i + j), vpd_size); | |
1295 | ro_size = vpd_size - i; | |
1296 | } | |
1297 | ||
1298 | /* | |
1299 | * Find the offset of the WWPN tag within the read only | |
1300 | * VPD data and validate the found field (partials are | |
1301 | * no good to us). Convert the ASCII data to an integer | |
1302 | * value. Note that we must copy to a temporary buffer | |
1303 | * because the conversion service requires that the ASCII | |
1304 | * string be terminated. | |
1305 | */ | |
1306 | for (k = 0; k < NUM_FC_PORTS; k++) { | |
1307 | j = ro_size; | |
1308 | i = ro_start + PCI_VPD_LRDT_TAG_SIZE; | |
1309 | ||
1310 | i = pci_vpd_find_info_keyword(vpd_data, i, j, wwpn_vpd_tags[k]); | |
1311 | if (unlikely(i < 0)) { | |
4392ba49 MO |
1312 | dev_err(&dev->dev, "%s: Port %d WWPN not found " |
1313 | "in VPD\n", __func__, k); | |
c21e0bbf MO |
1314 | rc = -ENODEV; |
1315 | goto out; | |
1316 | } | |
1317 | ||
1318 | j = pci_vpd_info_field_size(&vpd_data[i]); | |
1319 | i += PCI_VPD_INFO_FLD_HDR_SIZE; | |
1320 | if (unlikely((i + j > vpd_size) || (j != WWPN_LEN))) { | |
4392ba49 MO |
1321 | dev_err(&dev->dev, "%s: Port %d WWPN incomplete or " |
1322 | "VPD corrupt\n", | |
c21e0bbf MO |
1323 | __func__, k); |
1324 | rc = -ENODEV; | |
1325 | goto out; | |
1326 | } | |
1327 | ||
1328 | memcpy(tmp_buf, &vpd_data[i], WWPN_LEN); | |
1329 | rc = kstrtoul(tmp_buf, WWPN_LEN, (ulong *)&wwpn[k]); | |
1330 | if (unlikely(rc)) { | |
4392ba49 MO |
1331 | dev_err(&dev->dev, "%s: Fail to convert port %d WWPN " |
1332 | "to integer\n", __func__, k); | |
c21e0bbf MO |
1333 | rc = -ENODEV; |
1334 | goto out; | |
1335 | } | |
1336 | } | |
1337 | ||
1338 | out: | |
1339 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1340 | return rc; | |
1341 | } | |
1342 | ||
1343 | /** | |
15305514 | 1344 | * init_pcr() - initialize the provisioning and control registers |
1284fb0c | 1345 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 1346 | * |
15305514 MO |
1347 | * Also sets up fast access to the mapped registers and initializes AFU |
1348 | * command fields that never change. | |
c21e0bbf | 1349 | */ |
15305514 | 1350 | static void init_pcr(struct cxlflash_cfg *cfg) |
c21e0bbf MO |
1351 | { |
1352 | struct afu *afu = cfg->afu; | |
1786f4a0 | 1353 | struct sisl_ctrl_map __iomem *ctrl_map; |
c21e0bbf MO |
1354 | int i; |
1355 | ||
1356 | for (i = 0; i < MAX_CONTEXT; i++) { | |
1357 | ctrl_map = &afu->afu_map->ctrls[i].ctrl; | |
f15fbf8d MO |
1358 | /* Disrupt any clients that could be running */ |
1359 | /* e.g. clients that survived a master restart */ | |
c21e0bbf MO |
1360 | writeq_be(0, &ctrl_map->rht_start); |
1361 | writeq_be(0, &ctrl_map->rht_cnt_id); | |
1362 | writeq_be(0, &ctrl_map->ctx_cap); | |
1363 | } | |
1364 | ||
f15fbf8d | 1365 | /* Copy frequently used fields into afu */ |
c21e0bbf | 1366 | afu->ctx_hndl = (u16) cxl_process_element(cfg->mcctx); |
c21e0bbf MO |
1367 | afu->host_map = &afu->afu_map->hosts[afu->ctx_hndl].host; |
1368 | afu->ctrl_map = &afu->afu_map->ctrls[afu->ctx_hndl].ctrl; | |
1369 | ||
1370 | /* Program the Endian Control for the master context */ | |
1371 | writeq_be(SISL_ENDIAN_CTRL, &afu->host_map->endian_ctrl); | |
c21e0bbf MO |
1372 | } |
1373 | ||
1374 | /** | |
1375 | * init_global() - initialize AFU global registers | |
1284fb0c | 1376 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 1377 | */ |
15305514 | 1378 | static int init_global(struct cxlflash_cfg *cfg) |
c21e0bbf MO |
1379 | { |
1380 | struct afu *afu = cfg->afu; | |
4392ba49 | 1381 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
1382 | u64 wwpn[NUM_FC_PORTS]; /* wwpn of AFU ports */ |
1383 | int i = 0, num_ports = 0; | |
1384 | int rc = 0; | |
1385 | u64 reg; | |
1386 | ||
1387 | rc = read_vpd(cfg, &wwpn[0]); | |
1388 | if (rc) { | |
4392ba49 | 1389 | dev_err(dev, "%s: could not read vpd rc=%d\n", __func__, rc); |
c21e0bbf MO |
1390 | goto out; |
1391 | } | |
1392 | ||
1393 | pr_debug("%s: wwpn0=0x%llX wwpn1=0x%llX\n", __func__, wwpn[0], wwpn[1]); | |
1394 | ||
f15fbf8d | 1395 | /* Set up RRQ in AFU for master issued cmds */ |
c21e0bbf MO |
1396 | writeq_be((u64) afu->hrrq_start, &afu->host_map->rrq_start); |
1397 | writeq_be((u64) afu->hrrq_end, &afu->host_map->rrq_end); | |
1398 | ||
1399 | /* AFU configuration */ | |
1400 | reg = readq_be(&afu->afu_map->global.regs.afu_config); | |
1401 | reg |= SISL_AFUCONF_AR_ALL|SISL_AFUCONF_ENDIAN; | |
1402 | /* enable all auto retry options and control endianness */ | |
1403 | /* leave others at default: */ | |
1404 | /* CTX_CAP write protected, mbox_r does not clear on read and */ | |
1405 | /* checker on if dual afu */ | |
1406 | writeq_be(reg, &afu->afu_map->global.regs.afu_config); | |
1407 | ||
f15fbf8d | 1408 | /* Global port select: select either port */ |
c21e0bbf | 1409 | if (afu->internal_lun) { |
f15fbf8d | 1410 | /* Only use port 0 */ |
c21e0bbf MO |
1411 | writeq_be(PORT0, &afu->afu_map->global.regs.afu_port_sel); |
1412 | num_ports = NUM_FC_PORTS - 1; | |
1413 | } else { | |
1414 | writeq_be(BOTH_PORTS, &afu->afu_map->global.regs.afu_port_sel); | |
1415 | num_ports = NUM_FC_PORTS; | |
1416 | } | |
1417 | ||
1418 | for (i = 0; i < num_ports; i++) { | |
f15fbf8d | 1419 | /* Unmask all errors (but they are still masked at AFU) */ |
c21e0bbf | 1420 | writeq_be(0, &afu->afu_map->global.fc_regs[i][FC_ERRMSK / 8]); |
f15fbf8d | 1421 | /* Clear CRC error cnt & set a threshold */ |
c21e0bbf MO |
1422 | (void)readq_be(&afu->afu_map->global. |
1423 | fc_regs[i][FC_CNT_CRCERR / 8]); | |
1424 | writeq_be(MC_CRC_THRESH, &afu->afu_map->global.fc_regs[i] | |
1425 | [FC_CRC_THRESH / 8]); | |
1426 | ||
f15fbf8d | 1427 | /* Set WWPNs. If already programmed, wwpn[i] is 0 */ |
f8013261 MO |
1428 | if (wwpn[i] != 0) |
1429 | afu_set_wwpn(afu, i, | |
1430 | &afu->afu_map->global.fc_regs[i][0], | |
1431 | wwpn[i]); | |
c21e0bbf MO |
1432 | /* Programming WWPN back to back causes additional |
1433 | * offline/online transitions and a PLOGI | |
1434 | */ | |
1435 | msleep(100); | |
c21e0bbf MO |
1436 | } |
1437 | ||
f15fbf8d MO |
1438 | /* Set up master's own CTX_CAP to allow real mode, host translation */ |
1439 | /* tables, afu cmds and read/write GSCSI cmds. */ | |
c21e0bbf MO |
1440 | /* First, unlock ctx_cap write by reading mbox */ |
1441 | (void)readq_be(&afu->ctrl_map->mbox_r); /* unlock ctx_cap */ | |
1442 | writeq_be((SISL_CTX_CAP_REAL_MODE | SISL_CTX_CAP_HOST_XLATE | | |
1443 | SISL_CTX_CAP_READ_CMD | SISL_CTX_CAP_WRITE_CMD | | |
1444 | SISL_CTX_CAP_AFU_CMD | SISL_CTX_CAP_GSCSI_CMD), | |
1445 | &afu->ctrl_map->ctx_cap); | |
f15fbf8d | 1446 | /* Initialize heartbeat */ |
c21e0bbf MO |
1447 | afu->hb = readq_be(&afu->afu_map->global.regs.afu_hb); |
1448 | ||
1449 | out: | |
1450 | return rc; | |
1451 | } | |
1452 | ||
1453 | /** | |
1454 | * start_afu() - initializes and starts the AFU | |
1284fb0c | 1455 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1456 | */ |
1457 | static int start_afu(struct cxlflash_cfg *cfg) | |
1458 | { | |
1459 | struct afu *afu = cfg->afu; | |
c21e0bbf MO |
1460 | int rc = 0; |
1461 | ||
c21e0bbf MO |
1462 | init_pcr(cfg); |
1463 | ||
af10483e MO |
1464 | /* After an AFU reset, RRQ entries are stale, clear them */ |
1465 | memset(&afu->rrq_entry, 0, sizeof(afu->rrq_entry)); | |
1466 | ||
f15fbf8d | 1467 | /* Initialize RRQ pointers */ |
c21e0bbf MO |
1468 | afu->hrrq_start = &afu->rrq_entry[0]; |
1469 | afu->hrrq_end = &afu->rrq_entry[NUM_RRQ_ENTRY - 1]; | |
1470 | afu->hrrq_curr = afu->hrrq_start; | |
1471 | afu->toggle = 1; | |
1472 | ||
1473 | rc = init_global(cfg); | |
1474 | ||
1475 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1476 | return rc; | |
1477 | } | |
1478 | ||
1479 | /** | |
9526f360 | 1480 | * init_intr() - setup interrupt handlers for the master context |
1284fb0c | 1481 | * @cfg: Internal structure associated with the host. |
c21e0bbf | 1482 | * |
1284fb0c | 1483 | * Return: 0 on success, -errno on failure |
c21e0bbf | 1484 | */ |
9526f360 MK |
1485 | static enum undo_level init_intr(struct cxlflash_cfg *cfg, |
1486 | struct cxl_context *ctx) | |
c21e0bbf | 1487 | { |
c21e0bbf | 1488 | struct afu *afu = cfg->afu; |
9526f360 | 1489 | struct device *dev = &cfg->dev->dev; |
c21e0bbf | 1490 | int rc = 0; |
9526f360 | 1491 | enum undo_level level = UNDO_NOOP; |
c21e0bbf MO |
1492 | |
1493 | rc = cxl_allocate_afu_irqs(ctx, 3); | |
1494 | if (unlikely(rc)) { | |
1495 | dev_err(dev, "%s: call to allocate_afu_irqs failed rc=%d!\n", | |
1496 | __func__, rc); | |
9526f360 | 1497 | level = UNDO_NOOP; |
c21e0bbf MO |
1498 | goto out; |
1499 | } | |
1500 | ||
1501 | rc = cxl_map_afu_irq(ctx, 1, cxlflash_sync_err_irq, afu, | |
1502 | "SISL_MSI_SYNC_ERROR"); | |
1503 | if (unlikely(rc <= 0)) { | |
1504 | dev_err(dev, "%s: IRQ 1 (SISL_MSI_SYNC_ERROR) map failed!\n", | |
1505 | __func__); | |
1506 | level = FREE_IRQ; | |
1507 | goto out; | |
1508 | } | |
1509 | ||
1510 | rc = cxl_map_afu_irq(ctx, 2, cxlflash_rrq_irq, afu, | |
1511 | "SISL_MSI_RRQ_UPDATED"); | |
1512 | if (unlikely(rc <= 0)) { | |
1513 | dev_err(dev, "%s: IRQ 2 (SISL_MSI_RRQ_UPDATED) map failed!\n", | |
1514 | __func__); | |
1515 | level = UNMAP_ONE; | |
1516 | goto out; | |
1517 | } | |
1518 | ||
1519 | rc = cxl_map_afu_irq(ctx, 3, cxlflash_async_err_irq, afu, | |
1520 | "SISL_MSI_ASYNC_ERROR"); | |
1521 | if (unlikely(rc <= 0)) { | |
1522 | dev_err(dev, "%s: IRQ 3 (SISL_MSI_ASYNC_ERROR) map failed!\n", | |
1523 | __func__); | |
1524 | level = UNMAP_TWO; | |
1525 | goto out; | |
1526 | } | |
9526f360 MK |
1527 | out: |
1528 | return level; | |
1529 | } | |
c21e0bbf | 1530 | |
9526f360 MK |
1531 | /** |
1532 | * init_mc() - create and register as the master context | |
1533 | * @cfg: Internal structure associated with the host. | |
1534 | * | |
1535 | * Return: 0 on success, -errno on failure | |
1536 | */ | |
1537 | static int init_mc(struct cxlflash_cfg *cfg) | |
1538 | { | |
1539 | struct cxl_context *ctx; | |
1540 | struct device *dev = &cfg->dev->dev; | |
1541 | int rc = 0; | |
1542 | enum undo_level level; | |
1543 | ||
1544 | ctx = cxl_get_context(cfg->dev); | |
1545 | if (unlikely(!ctx)) { | |
1546 | rc = -ENOMEM; | |
1547 | goto ret; | |
1548 | } | |
1549 | cfg->mcctx = ctx; | |
1550 | ||
1551 | /* Set it up as a master with the CXL */ | |
1552 | cxl_set_master(ctx); | |
1553 | ||
1554 | /* During initialization reset the AFU to start from a clean slate */ | |
1555 | rc = cxl_afu_reset(cfg->mcctx); | |
1556 | if (unlikely(rc)) { | |
1557 | dev_err(dev, "%s: initial AFU reset failed rc=%d\n", | |
1558 | __func__, rc); | |
1559 | goto ret; | |
1560 | } | |
1561 | ||
1562 | level = init_intr(cfg, ctx); | |
1563 | if (unlikely(level)) { | |
1564 | dev_err(dev, "%s: setting up interrupts failed rc=%d\n", | |
1565 | __func__, rc); | |
1566 | goto out; | |
1567 | } | |
c21e0bbf MO |
1568 | |
1569 | /* This performs the equivalent of the CXL_IOCTL_START_WORK. | |
1570 | * The CXL_IOCTL_GET_PROCESS_ELEMENT is implicit in the process | |
1571 | * element (pe) that is embedded in the context (ctx) | |
1572 | */ | |
1573 | rc = start_context(cfg); | |
1574 | if (unlikely(rc)) { | |
1575 | dev_err(dev, "%s: start context failed rc=%d\n", __func__, rc); | |
1576 | level = UNMAP_THREE; | |
1577 | goto out; | |
1578 | } | |
1579 | ret: | |
1580 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1581 | return rc; | |
1582 | out: | |
9526f360 | 1583 | term_intr(cfg, level); |
c21e0bbf MO |
1584 | goto ret; |
1585 | } | |
1586 | ||
1587 | /** | |
1588 | * init_afu() - setup as master context and start AFU | |
1284fb0c | 1589 | * @cfg: Internal structure associated with the host. |
c21e0bbf MO |
1590 | * |
1591 | * This routine is a higher level of control for configuring the | |
1592 | * AFU on probe and reset paths. | |
1593 | * | |
1284fb0c | 1594 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
1595 | */ |
1596 | static int init_afu(struct cxlflash_cfg *cfg) | |
1597 | { | |
1598 | u64 reg; | |
1599 | int rc = 0; | |
1600 | struct afu *afu = cfg->afu; | |
1601 | struct device *dev = &cfg->dev->dev; | |
1602 | ||
5cdac81a MO |
1603 | cxl_perst_reloads_same_image(cfg->cxl_afu, true); |
1604 | ||
c21e0bbf MO |
1605 | rc = init_mc(cfg); |
1606 | if (rc) { | |
1607 | dev_err(dev, "%s: call to init_mc failed, rc=%d!\n", | |
1608 | __func__, rc); | |
ee3491ba | 1609 | goto out; |
c21e0bbf MO |
1610 | } |
1611 | ||
f15fbf8d | 1612 | /* Map the entire MMIO space of the AFU */ |
c21e0bbf MO |
1613 | afu->afu_map = cxl_psa_map(cfg->mcctx); |
1614 | if (!afu->afu_map) { | |
c21e0bbf | 1615 | dev_err(dev, "%s: call to cxl_psa_map failed!\n", __func__); |
ee3491ba | 1616 | rc = -ENOMEM; |
c21e0bbf MO |
1617 | goto err1; |
1618 | } | |
b45cdbaf | 1619 | kref_init(&afu->mapcount); |
c21e0bbf | 1620 | |
e5ce067b MO |
1621 | /* No byte reverse on reading afu_version or string will be backwards */ |
1622 | reg = readq(&afu->afu_map->global.regs.afu_version); | |
1623 | memcpy(afu->version, ®, sizeof(reg)); | |
c21e0bbf MO |
1624 | afu->interface_version = |
1625 | readq_be(&afu->afu_map->global.regs.interface_version); | |
e5ce067b MO |
1626 | if ((afu->interface_version + 1) == 0) { |
1627 | pr_err("Back level AFU, please upgrade. AFU version %s " | |
1628 | "interface version 0x%llx\n", afu->version, | |
1629 | afu->interface_version); | |
1630 | rc = -EINVAL; | |
ee3491ba MO |
1631 | goto err2; |
1632 | } | |
1633 | ||
1634 | pr_debug("%s: afu version %s, interface version 0x%llX\n", __func__, | |
1635 | afu->version, afu->interface_version); | |
c21e0bbf MO |
1636 | |
1637 | rc = start_afu(cfg); | |
1638 | if (rc) { | |
1639 | dev_err(dev, "%s: call to start_afu failed, rc=%d!\n", | |
1640 | __func__, rc); | |
ee3491ba | 1641 | goto err2; |
c21e0bbf MO |
1642 | } |
1643 | ||
1644 | afu_err_intr_init(cfg->afu); | |
11f7b184 UK |
1645 | spin_lock_init(&afu->rrin_slock); |
1646 | afu->room = readq_be(&afu->host_map->cmd_room); | |
c21e0bbf | 1647 | |
2cb79266 MO |
1648 | /* Restore the LUN mappings */ |
1649 | cxlflash_restore_luntable(cfg); | |
ee3491ba | 1650 | out: |
c21e0bbf MO |
1651 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
1652 | return rc; | |
ee3491ba MO |
1653 | |
1654 | err2: | |
b45cdbaf | 1655 | kref_put(&afu->mapcount, afu_unmap); |
ee3491ba | 1656 | err1: |
9526f360 MK |
1657 | term_intr(cfg, UNMAP_THREE); |
1658 | term_mc(cfg); | |
ee3491ba | 1659 | goto out; |
c21e0bbf MO |
1660 | } |
1661 | ||
c21e0bbf MO |
1662 | /** |
1663 | * cxlflash_afu_sync() - builds and sends an AFU sync command | |
1664 | * @afu: AFU associated with the host. | |
1665 | * @ctx_hndl_u: Identifies context requesting sync. | |
1666 | * @res_hndl_u: Identifies resource requesting sync. | |
1667 | * @mode: Type of sync to issue (lightweight, heavyweight, global). | |
1668 | * | |
1669 | * The AFU can only take 1 sync command at a time. This routine enforces this | |
f15fbf8d | 1670 | * limitation by using a mutex to provide exclusive access to the AFU during |
c21e0bbf MO |
1671 | * the sync. This design point requires calling threads to not be on interrupt |
1672 | * context due to the possibility of sleeping during concurrent sync operations. | |
1673 | * | |
5cdac81a MO |
1674 | * AFU sync operations are only necessary and allowed when the device is |
1675 | * operating normally. When not operating normally, sync requests can occur as | |
1676 | * part of cleaning up resources associated with an adapter prior to removal. | |
1677 | * In this scenario, these requests are simply ignored (safe due to the AFU | |
1678 | * going away). | |
1679 | * | |
c21e0bbf MO |
1680 | * Return: |
1681 | * 0 on success | |
1682 | * -1 on failure | |
1683 | */ | |
1684 | int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t ctx_hndl_u, | |
1685 | res_hndl_t res_hndl_u, u8 mode) | |
1686 | { | |
5cdac81a | 1687 | struct cxlflash_cfg *cfg = afu->parent; |
4392ba49 | 1688 | struct device *dev = &cfg->dev->dev; |
c21e0bbf | 1689 | struct afu_cmd *cmd = NULL; |
350bb478 | 1690 | char *buf = NULL; |
c21e0bbf | 1691 | int rc = 0; |
c21e0bbf MO |
1692 | static DEFINE_MUTEX(sync_active); |
1693 | ||
5cdac81a MO |
1694 | if (cfg->state != STATE_NORMAL) { |
1695 | pr_debug("%s: Sync not required! (%u)\n", __func__, cfg->state); | |
1696 | return 0; | |
1697 | } | |
1698 | ||
c21e0bbf | 1699 | mutex_lock(&sync_active); |
de01283b | 1700 | atomic_inc(&afu->cmds_active); |
350bb478 MO |
1701 | buf = kzalloc(sizeof(*cmd) + __alignof__(*cmd) - 1, GFP_KERNEL); |
1702 | if (unlikely(!buf)) { | |
1703 | dev_err(dev, "%s: no memory for command\n", __func__); | |
c21e0bbf MO |
1704 | rc = -1; |
1705 | goto out; | |
1706 | } | |
1707 | ||
350bb478 MO |
1708 | cmd = (struct afu_cmd *)PTR_ALIGN(buf, __alignof__(*cmd)); |
1709 | init_completion(&cmd->cevent); | |
350bb478 | 1710 | cmd->parent = afu; |
c21e0bbf | 1711 | |
350bb478 | 1712 | pr_debug("%s: afu=%p cmd=%p %d\n", __func__, afu, cmd, ctx_hndl_u); |
c21e0bbf MO |
1713 | |
1714 | cmd->rcb.req_flags = SISL_REQ_FLAGS_AFU_CMD; | |
350bb478 MO |
1715 | cmd->rcb.ctx_id = afu->ctx_hndl; |
1716 | cmd->rcb.msi = SISL_MSI_RRQ_UPDATED; | |
c21e0bbf MO |
1717 | cmd->rcb.timeout = MC_AFU_SYNC_TIMEOUT; |
1718 | ||
1719 | cmd->rcb.cdb[0] = 0xC0; /* AFU Sync */ | |
1720 | cmd->rcb.cdb[1] = mode; | |
1721 | ||
1722 | /* The cdb is aligned, no unaligned accessors required */ | |
1786f4a0 MO |
1723 | *((__be16 *)&cmd->rcb.cdb[2]) = cpu_to_be16(ctx_hndl_u); |
1724 | *((__be32 *)&cmd->rcb.cdb[4]) = cpu_to_be32(res_hndl_u); | |
c21e0bbf | 1725 | |
15305514 | 1726 | rc = send_cmd(afu, cmd); |
c21e0bbf MO |
1727 | if (unlikely(rc)) |
1728 | goto out; | |
1729 | ||
9ba848ac MO |
1730 | rc = wait_resp(afu, cmd); |
1731 | if (unlikely(rc)) | |
c21e0bbf MO |
1732 | rc = -1; |
1733 | out: | |
de01283b | 1734 | atomic_dec(&afu->cmds_active); |
c21e0bbf | 1735 | mutex_unlock(&sync_active); |
350bb478 | 1736 | kfree(buf); |
c21e0bbf MO |
1737 | pr_debug("%s: returning rc=%d\n", __func__, rc); |
1738 | return rc; | |
1739 | } | |
1740 | ||
1741 | /** | |
15305514 MO |
1742 | * afu_reset() - resets the AFU |
1743 | * @cfg: Internal structure associated with the host. | |
c21e0bbf | 1744 | * |
1284fb0c | 1745 | * Return: 0 on success, -errno on failure |
c21e0bbf | 1746 | */ |
15305514 | 1747 | static int afu_reset(struct cxlflash_cfg *cfg) |
c21e0bbf MO |
1748 | { |
1749 | int rc = 0; | |
1750 | /* Stop the context before the reset. Since the context is | |
1751 | * no longer available restart it after the reset is complete | |
1752 | */ | |
1753 | ||
1754 | term_afu(cfg); | |
1755 | ||
1756 | rc = init_afu(cfg); | |
1757 | ||
1758 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1759 | return rc; | |
1760 | } | |
1761 | ||
f411396d MK |
1762 | /** |
1763 | * drain_ioctls() - wait until all currently executing ioctls have completed | |
1764 | * @cfg: Internal structure associated with the host. | |
1765 | * | |
1766 | * Obtain write access to read/write semaphore that wraps ioctl | |
1767 | * handling to 'drain' ioctls currently executing. | |
1768 | */ | |
1769 | static void drain_ioctls(struct cxlflash_cfg *cfg) | |
1770 | { | |
1771 | down_write(&cfg->ioctl_rwsem); | |
1772 | up_write(&cfg->ioctl_rwsem); | |
1773 | } | |
1774 | ||
15305514 MO |
1775 | /** |
1776 | * cxlflash_eh_device_reset_handler() - reset a single LUN | |
1777 | * @scp: SCSI command to send. | |
1778 | * | |
1779 | * Return: | |
1780 | * SUCCESS as defined in scsi/scsi.h | |
1781 | * FAILED as defined in scsi/scsi.h | |
1782 | */ | |
1783 | static int cxlflash_eh_device_reset_handler(struct scsi_cmnd *scp) | |
1784 | { | |
1785 | int rc = SUCCESS; | |
1786 | struct Scsi_Host *host = scp->device->host; | |
1787 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; | |
1788 | struct afu *afu = cfg->afu; | |
1789 | int rcr = 0; | |
1790 | ||
1791 | pr_debug("%s: (scp=%p) %d/%d/%d/%llu " | |
1792 | "cdb=(%08X-%08X-%08X-%08X)\n", __func__, scp, | |
1793 | host->host_no, scp->device->channel, | |
1794 | scp->device->id, scp->device->lun, | |
1795 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
1796 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
1797 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
1798 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
1799 | ||
ed486daa | 1800 | retry: |
15305514 MO |
1801 | switch (cfg->state) { |
1802 | case STATE_NORMAL: | |
1803 | rcr = send_tmf(afu, scp, TMF_LUN_RESET); | |
1804 | if (unlikely(rcr)) | |
1805 | rc = FAILED; | |
1806 | break; | |
1807 | case STATE_RESET: | |
1808 | wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); | |
ed486daa | 1809 | goto retry; |
15305514 MO |
1810 | default: |
1811 | rc = FAILED; | |
1812 | break; | |
1813 | } | |
1814 | ||
1815 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1816 | return rc; | |
1817 | } | |
1818 | ||
1819 | /** | |
1820 | * cxlflash_eh_host_reset_handler() - reset the host adapter | |
1821 | * @scp: SCSI command from stack identifying host. | |
1822 | * | |
1d3324c3 MO |
1823 | * Following a reset, the state is evaluated again in case an EEH occurred |
1824 | * during the reset. In such a scenario, the host reset will either yield | |
1825 | * until the EEH recovery is complete or return success or failure based | |
1826 | * upon the current device state. | |
1827 | * | |
15305514 MO |
1828 | * Return: |
1829 | * SUCCESS as defined in scsi/scsi.h | |
1830 | * FAILED as defined in scsi/scsi.h | |
1831 | */ | |
1832 | static int cxlflash_eh_host_reset_handler(struct scsi_cmnd *scp) | |
1833 | { | |
1834 | int rc = SUCCESS; | |
1835 | int rcr = 0; | |
1836 | struct Scsi_Host *host = scp->device->host; | |
1837 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)host->hostdata; | |
1838 | ||
1839 | pr_debug("%s: (scp=%p) %d/%d/%d/%llu " | |
1840 | "cdb=(%08X-%08X-%08X-%08X)\n", __func__, scp, | |
1841 | host->host_no, scp->device->channel, | |
1842 | scp->device->id, scp->device->lun, | |
1843 | get_unaligned_be32(&((u32 *)scp->cmnd)[0]), | |
1844 | get_unaligned_be32(&((u32 *)scp->cmnd)[1]), | |
1845 | get_unaligned_be32(&((u32 *)scp->cmnd)[2]), | |
1846 | get_unaligned_be32(&((u32 *)scp->cmnd)[3])); | |
1847 | ||
1848 | switch (cfg->state) { | |
1849 | case STATE_NORMAL: | |
1850 | cfg->state = STATE_RESET; | |
f411396d | 1851 | drain_ioctls(cfg); |
15305514 MO |
1852 | cxlflash_mark_contexts_error(cfg); |
1853 | rcr = afu_reset(cfg); | |
1854 | if (rcr) { | |
1855 | rc = FAILED; | |
1856 | cfg->state = STATE_FAILTERM; | |
1857 | } else | |
1858 | cfg->state = STATE_NORMAL; | |
1859 | wake_up_all(&cfg->reset_waitq); | |
1d3324c3 MO |
1860 | ssleep(1); |
1861 | /* fall through */ | |
15305514 MO |
1862 | case STATE_RESET: |
1863 | wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); | |
1864 | if (cfg->state == STATE_NORMAL) | |
1865 | break; | |
1866 | /* fall through */ | |
1867 | default: | |
1868 | rc = FAILED; | |
1869 | break; | |
1870 | } | |
1871 | ||
1872 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
1873 | return rc; | |
1874 | } | |
1875 | ||
1876 | /** | |
1877 | * cxlflash_change_queue_depth() - change the queue depth for the device | |
1878 | * @sdev: SCSI device destined for queue depth change. | |
1879 | * @qdepth: Requested queue depth value to set. | |
1880 | * | |
1881 | * The requested queue depth is capped to the maximum supported value. | |
1882 | * | |
1883 | * Return: The actual queue depth set. | |
1884 | */ | |
1885 | static int cxlflash_change_queue_depth(struct scsi_device *sdev, int qdepth) | |
1886 | { | |
1887 | ||
1888 | if (qdepth > CXLFLASH_MAX_CMDS_PER_LUN) | |
1889 | qdepth = CXLFLASH_MAX_CMDS_PER_LUN; | |
1890 | ||
1891 | scsi_change_queue_depth(sdev, qdepth); | |
1892 | return sdev->queue_depth; | |
1893 | } | |
1894 | ||
1895 | /** | |
1896 | * cxlflash_show_port_status() - queries and presents the current port status | |
e0f01a21 MO |
1897 | * @port: Desired port for status reporting. |
1898 | * @afu: AFU owning the specified port. | |
15305514 MO |
1899 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. |
1900 | * | |
1901 | * Return: The size of the ASCII string returned in @buf. | |
1902 | */ | |
e0f01a21 | 1903 | static ssize_t cxlflash_show_port_status(u32 port, struct afu *afu, char *buf) |
15305514 | 1904 | { |
15305514 | 1905 | char *disp_status; |
15305514 | 1906 | u64 status; |
e0f01a21 | 1907 | __be64 __iomem *fc_regs; |
15305514 | 1908 | |
e0f01a21 | 1909 | if (port >= NUM_FC_PORTS) |
15305514 MO |
1910 | return 0; |
1911 | ||
1912 | fc_regs = &afu->afu_map->global.fc_regs[port][0]; | |
e0f01a21 MO |
1913 | status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); |
1914 | status &= FC_MTIP_STATUS_MASK; | |
15305514 MO |
1915 | |
1916 | if (status == FC_MTIP_STATUS_ONLINE) | |
1917 | disp_status = "online"; | |
1918 | else if (status == FC_MTIP_STATUS_OFFLINE) | |
1919 | disp_status = "offline"; | |
1920 | else | |
1921 | disp_status = "unknown"; | |
1922 | ||
e0f01a21 MO |
1923 | return scnprintf(buf, PAGE_SIZE, "%s\n", disp_status); |
1924 | } | |
1925 | ||
1926 | /** | |
1927 | * port0_show() - queries and presents the current status of port 0 | |
1928 | * @dev: Generic device associated with the host owning the port. | |
1929 | * @attr: Device attribute representing the port. | |
1930 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
1931 | * | |
1932 | * Return: The size of the ASCII string returned in @buf. | |
1933 | */ | |
1934 | static ssize_t port0_show(struct device *dev, | |
1935 | struct device_attribute *attr, | |
1936 | char *buf) | |
1937 | { | |
1938 | struct Scsi_Host *shost = class_to_shost(dev); | |
1939 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
1940 | struct afu *afu = cfg->afu; | |
1941 | ||
1942 | return cxlflash_show_port_status(0, afu, buf); | |
15305514 MO |
1943 | } |
1944 | ||
1945 | /** | |
e0f01a21 MO |
1946 | * port1_show() - queries and presents the current status of port 1 |
1947 | * @dev: Generic device associated with the host owning the port. | |
1948 | * @attr: Device attribute representing the port. | |
1949 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
1950 | * | |
1951 | * Return: The size of the ASCII string returned in @buf. | |
1952 | */ | |
1953 | static ssize_t port1_show(struct device *dev, | |
1954 | struct device_attribute *attr, | |
1955 | char *buf) | |
1956 | { | |
1957 | struct Scsi_Host *shost = class_to_shost(dev); | |
1958 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
1959 | struct afu *afu = cfg->afu; | |
1960 | ||
1961 | return cxlflash_show_port_status(1, afu, buf); | |
1962 | } | |
1963 | ||
1964 | /** | |
1965 | * lun_mode_show() - presents the current LUN mode of the host | |
15305514 | 1966 | * @dev: Generic device associated with the host. |
e0f01a21 | 1967 | * @attr: Device attribute representing the LUN mode. |
15305514 MO |
1968 | * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII. |
1969 | * | |
1970 | * Return: The size of the ASCII string returned in @buf. | |
1971 | */ | |
e0f01a21 MO |
1972 | static ssize_t lun_mode_show(struct device *dev, |
1973 | struct device_attribute *attr, char *buf) | |
15305514 MO |
1974 | { |
1975 | struct Scsi_Host *shost = class_to_shost(dev); | |
1976 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
1977 | struct afu *afu = cfg->afu; | |
1978 | ||
e0f01a21 | 1979 | return scnprintf(buf, PAGE_SIZE, "%u\n", afu->internal_lun); |
15305514 MO |
1980 | } |
1981 | ||
1982 | /** | |
e0f01a21 | 1983 | * lun_mode_store() - sets the LUN mode of the host |
15305514 | 1984 | * @dev: Generic device associated with the host. |
e0f01a21 | 1985 | * @attr: Device attribute representing the LUN mode. |
15305514 MO |
1986 | * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII. |
1987 | * @count: Length of data resizing in @buf. | |
1988 | * | |
1989 | * The CXL Flash AFU supports a dummy LUN mode where the external | |
1990 | * links and storage are not required. Space on the FPGA is used | |
1991 | * to create 1 or 2 small LUNs which are presented to the system | |
1992 | * as if they were a normal storage device. This feature is useful | |
1993 | * during development and also provides manufacturing with a way | |
1994 | * to test the AFU without an actual device. | |
1995 | * | |
1996 | * 0 = external LUN[s] (default) | |
1997 | * 1 = internal LUN (1 x 64K, 512B blocks, id 0) | |
1998 | * 2 = internal LUN (1 x 64K, 4K blocks, id 0) | |
1999 | * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1) | |
2000 | * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1) | |
2001 | * | |
2002 | * Return: The size of the ASCII string returned in @buf. | |
2003 | */ | |
e0f01a21 MO |
2004 | static ssize_t lun_mode_store(struct device *dev, |
2005 | struct device_attribute *attr, | |
2006 | const char *buf, size_t count) | |
15305514 MO |
2007 | { |
2008 | struct Scsi_Host *shost = class_to_shost(dev); | |
2009 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
2010 | struct afu *afu = cfg->afu; | |
2011 | int rc; | |
2012 | u32 lun_mode; | |
2013 | ||
2014 | rc = kstrtouint(buf, 10, &lun_mode); | |
2015 | if (!rc && (lun_mode < 5) && (lun_mode != afu->internal_lun)) { | |
2016 | afu->internal_lun = lun_mode; | |
603ecce9 MK |
2017 | |
2018 | /* | |
2019 | * When configured for internal LUN, there is only one channel, | |
2020 | * channel number 0, else there will be 2 (default). | |
2021 | */ | |
2022 | if (afu->internal_lun) | |
2023 | shost->max_channel = 0; | |
2024 | else | |
2025 | shost->max_channel = NUM_FC_PORTS - 1; | |
2026 | ||
15305514 MO |
2027 | afu_reset(cfg); |
2028 | scsi_scan_host(cfg->host); | |
2029 | } | |
2030 | ||
2031 | return count; | |
2032 | } | |
2033 | ||
2034 | /** | |
e0f01a21 | 2035 | * ioctl_version_show() - presents the current ioctl version of the host |
15305514 MO |
2036 | * @dev: Generic device associated with the host. |
2037 | * @attr: Device attribute representing the ioctl version. | |
2038 | * @buf: Buffer of length PAGE_SIZE to report back the ioctl version. | |
2039 | * | |
2040 | * Return: The size of the ASCII string returned in @buf. | |
2041 | */ | |
e0f01a21 MO |
2042 | static ssize_t ioctl_version_show(struct device *dev, |
2043 | struct device_attribute *attr, char *buf) | |
15305514 MO |
2044 | { |
2045 | return scnprintf(buf, PAGE_SIZE, "%u\n", DK_CXLFLASH_VERSION_0); | |
2046 | } | |
2047 | ||
2048 | /** | |
e0f01a21 MO |
2049 | * cxlflash_show_port_lun_table() - queries and presents the port LUN table |
2050 | * @port: Desired port for status reporting. | |
2051 | * @afu: AFU owning the specified port. | |
2052 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2053 | * | |
2054 | * Return: The size of the ASCII string returned in @buf. | |
2055 | */ | |
2056 | static ssize_t cxlflash_show_port_lun_table(u32 port, | |
2057 | struct afu *afu, | |
2058 | char *buf) | |
2059 | { | |
2060 | int i; | |
2061 | ssize_t bytes = 0; | |
2062 | __be64 __iomem *fc_port; | |
2063 | ||
2064 | if (port >= NUM_FC_PORTS) | |
2065 | return 0; | |
2066 | ||
2067 | fc_port = &afu->afu_map->global.fc_port[port][0]; | |
2068 | ||
2069 | for (i = 0; i < CXLFLASH_NUM_VLUNS; i++) | |
2070 | bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes, | |
2071 | "%03d: %016llX\n", i, readq_be(&fc_port[i])); | |
2072 | return bytes; | |
2073 | } | |
2074 | ||
2075 | /** | |
2076 | * port0_lun_table_show() - presents the current LUN table of port 0 | |
2077 | * @dev: Generic device associated with the host owning the port. | |
2078 | * @attr: Device attribute representing the port. | |
2079 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2080 | * | |
2081 | * Return: The size of the ASCII string returned in @buf. | |
2082 | */ | |
2083 | static ssize_t port0_lun_table_show(struct device *dev, | |
2084 | struct device_attribute *attr, | |
2085 | char *buf) | |
2086 | { | |
2087 | struct Scsi_Host *shost = class_to_shost(dev); | |
2088 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
2089 | struct afu *afu = cfg->afu; | |
2090 | ||
2091 | return cxlflash_show_port_lun_table(0, afu, buf); | |
2092 | } | |
2093 | ||
2094 | /** | |
2095 | * port1_lun_table_show() - presents the current LUN table of port 1 | |
2096 | * @dev: Generic device associated with the host owning the port. | |
2097 | * @attr: Device attribute representing the port. | |
2098 | * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. | |
2099 | * | |
2100 | * Return: The size of the ASCII string returned in @buf. | |
2101 | */ | |
2102 | static ssize_t port1_lun_table_show(struct device *dev, | |
2103 | struct device_attribute *attr, | |
2104 | char *buf) | |
2105 | { | |
2106 | struct Scsi_Host *shost = class_to_shost(dev); | |
2107 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)shost->hostdata; | |
2108 | struct afu *afu = cfg->afu; | |
2109 | ||
2110 | return cxlflash_show_port_lun_table(1, afu, buf); | |
2111 | } | |
2112 | ||
2113 | /** | |
2114 | * mode_show() - presents the current mode of the device | |
15305514 MO |
2115 | * @dev: Generic device associated with the device. |
2116 | * @attr: Device attribute representing the device mode. | |
2117 | * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII. | |
2118 | * | |
2119 | * Return: The size of the ASCII string returned in @buf. | |
2120 | */ | |
e0f01a21 MO |
2121 | static ssize_t mode_show(struct device *dev, |
2122 | struct device_attribute *attr, char *buf) | |
15305514 MO |
2123 | { |
2124 | struct scsi_device *sdev = to_scsi_device(dev); | |
2125 | ||
e0f01a21 MO |
2126 | return scnprintf(buf, PAGE_SIZE, "%s\n", |
2127 | sdev->hostdata ? "superpipe" : "legacy"); | |
15305514 MO |
2128 | } |
2129 | ||
2130 | /* | |
2131 | * Host attributes | |
2132 | */ | |
e0f01a21 MO |
2133 | static DEVICE_ATTR_RO(port0); |
2134 | static DEVICE_ATTR_RO(port1); | |
2135 | static DEVICE_ATTR_RW(lun_mode); | |
2136 | static DEVICE_ATTR_RO(ioctl_version); | |
2137 | static DEVICE_ATTR_RO(port0_lun_table); | |
2138 | static DEVICE_ATTR_RO(port1_lun_table); | |
15305514 MO |
2139 | |
2140 | static struct device_attribute *cxlflash_host_attrs[] = { | |
2141 | &dev_attr_port0, | |
2142 | &dev_attr_port1, | |
2143 | &dev_attr_lun_mode, | |
2144 | &dev_attr_ioctl_version, | |
e0f01a21 MO |
2145 | &dev_attr_port0_lun_table, |
2146 | &dev_attr_port1_lun_table, | |
15305514 MO |
2147 | NULL |
2148 | }; | |
2149 | ||
2150 | /* | |
2151 | * Device attributes | |
2152 | */ | |
e0f01a21 | 2153 | static DEVICE_ATTR_RO(mode); |
15305514 MO |
2154 | |
2155 | static struct device_attribute *cxlflash_dev_attrs[] = { | |
2156 | &dev_attr_mode, | |
2157 | NULL | |
2158 | }; | |
2159 | ||
2160 | /* | |
2161 | * Host template | |
2162 | */ | |
2163 | static struct scsi_host_template driver_template = { | |
2164 | .module = THIS_MODULE, | |
2165 | .name = CXLFLASH_ADAPTER_NAME, | |
2166 | .info = cxlflash_driver_info, | |
2167 | .ioctl = cxlflash_ioctl, | |
2168 | .proc_name = CXLFLASH_NAME, | |
2169 | .queuecommand = cxlflash_queuecommand, | |
2170 | .eh_device_reset_handler = cxlflash_eh_device_reset_handler, | |
2171 | .eh_host_reset_handler = cxlflash_eh_host_reset_handler, | |
2172 | .change_queue_depth = cxlflash_change_queue_depth, | |
83430833 | 2173 | .cmd_per_lun = CXLFLASH_MAX_CMDS_PER_LUN, |
15305514 | 2174 | .can_queue = CXLFLASH_MAX_CMDS, |
5fbb96c8 | 2175 | .cmd_size = sizeof(struct afu_cmd) + __alignof__(struct afu_cmd) - 1, |
15305514 | 2176 | .this_id = -1, |
68ab2d76 | 2177 | .sg_tablesize = 1, /* No scatter gather support */ |
15305514 MO |
2178 | .max_sectors = CXLFLASH_MAX_SECTORS, |
2179 | .use_clustering = ENABLE_CLUSTERING, | |
2180 | .shost_attrs = cxlflash_host_attrs, | |
2181 | .sdev_attrs = cxlflash_dev_attrs, | |
2182 | }; | |
2183 | ||
2184 | /* | |
2185 | * Device dependent values | |
2186 | */ | |
96e1b660 UK |
2187 | static struct dev_dependent_vals dev_corsa_vals = { CXLFLASH_MAX_SECTORS, |
2188 | 0ULL }; | |
2189 | static struct dev_dependent_vals dev_flash_gt_vals = { CXLFLASH_MAX_SECTORS, | |
704c4b0d | 2190 | CXLFLASH_NOTIFY_SHUTDOWN }; |
15305514 MO |
2191 | |
2192 | /* | |
2193 | * PCI device binding table | |
2194 | */ | |
2195 | static struct pci_device_id cxlflash_pci_table[] = { | |
2196 | {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CORSA, | |
2197 | PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_corsa_vals}, | |
a2746fb1 MK |
2198 | {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_FLASH_GT, |
2199 | PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_flash_gt_vals}, | |
15305514 MO |
2200 | {} |
2201 | }; | |
2202 | ||
2203 | MODULE_DEVICE_TABLE(pci, cxlflash_pci_table); | |
2204 | ||
c21e0bbf MO |
2205 | /** |
2206 | * cxlflash_worker_thread() - work thread handler for the AFU | |
2207 | * @work: Work structure contained within cxlflash associated with host. | |
2208 | * | |
2209 | * Handles the following events: | |
2210 | * - Link reset which cannot be performed on interrupt context due to | |
2211 | * blocking up to a few seconds | |
ef51074a | 2212 | * - Rescan the host |
c21e0bbf MO |
2213 | */ |
2214 | static void cxlflash_worker_thread(struct work_struct *work) | |
2215 | { | |
5cdac81a MO |
2216 | struct cxlflash_cfg *cfg = container_of(work, struct cxlflash_cfg, |
2217 | work_q); | |
c21e0bbf | 2218 | struct afu *afu = cfg->afu; |
4392ba49 | 2219 | struct device *dev = &cfg->dev->dev; |
c21e0bbf MO |
2220 | int port; |
2221 | ulong lock_flags; | |
2222 | ||
5cdac81a MO |
2223 | /* Avoid MMIO if the device has failed */ |
2224 | ||
2225 | if (cfg->state != STATE_NORMAL) | |
2226 | return; | |
2227 | ||
c21e0bbf MO |
2228 | spin_lock_irqsave(cfg->host->host_lock, lock_flags); |
2229 | ||
2230 | if (cfg->lr_state == LINK_RESET_REQUIRED) { | |
2231 | port = cfg->lr_port; | |
2232 | if (port < 0) | |
4392ba49 MO |
2233 | dev_err(dev, "%s: invalid port index %d\n", |
2234 | __func__, port); | |
c21e0bbf MO |
2235 | else { |
2236 | spin_unlock_irqrestore(cfg->host->host_lock, | |
2237 | lock_flags); | |
2238 | ||
2239 | /* The reset can block... */ | |
2240 | afu_link_reset(afu, port, | |
f15fbf8d | 2241 | &afu->afu_map->global.fc_regs[port][0]); |
c21e0bbf MO |
2242 | spin_lock_irqsave(cfg->host->host_lock, lock_flags); |
2243 | } | |
2244 | ||
2245 | cfg->lr_state = LINK_RESET_COMPLETE; | |
2246 | } | |
2247 | ||
c21e0bbf | 2248 | spin_unlock_irqrestore(cfg->host->host_lock, lock_flags); |
ef51074a MO |
2249 | |
2250 | if (atomic_dec_if_positive(&cfg->scan_host_needed) >= 0) | |
2251 | scsi_scan_host(cfg->host); | |
b45cdbaf | 2252 | kref_put(&afu->mapcount, afu_unmap); |
c21e0bbf MO |
2253 | } |
2254 | ||
2255 | /** | |
2256 | * cxlflash_probe() - PCI entry point to add host | |
2257 | * @pdev: PCI device associated with the host. | |
2258 | * @dev_id: PCI device id associated with device. | |
2259 | * | |
1284fb0c | 2260 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
2261 | */ |
2262 | static int cxlflash_probe(struct pci_dev *pdev, | |
2263 | const struct pci_device_id *dev_id) | |
2264 | { | |
2265 | struct Scsi_Host *host; | |
2266 | struct cxlflash_cfg *cfg = NULL; | |
c21e0bbf MO |
2267 | struct dev_dependent_vals *ddv; |
2268 | int rc = 0; | |
2269 | ||
2270 | dev_dbg(&pdev->dev, "%s: Found CXLFLASH with IRQ: %d\n", | |
2271 | __func__, pdev->irq); | |
2272 | ||
2273 | ddv = (struct dev_dependent_vals *)dev_id->driver_data; | |
2274 | driver_template.max_sectors = ddv->max_sectors; | |
2275 | ||
2276 | host = scsi_host_alloc(&driver_template, sizeof(struct cxlflash_cfg)); | |
2277 | if (!host) { | |
2278 | dev_err(&pdev->dev, "%s: call to scsi_host_alloc failed!\n", | |
2279 | __func__); | |
2280 | rc = -ENOMEM; | |
2281 | goto out; | |
2282 | } | |
2283 | ||
2284 | host->max_id = CXLFLASH_MAX_NUM_TARGETS_PER_BUS; | |
2285 | host->max_lun = CXLFLASH_MAX_NUM_LUNS_PER_TARGET; | |
2286 | host->max_channel = NUM_FC_PORTS - 1; | |
2287 | host->unique_id = host->host_no; | |
2288 | host->max_cmd_len = CXLFLASH_MAX_CDB_LEN; | |
2289 | ||
2290 | cfg = (struct cxlflash_cfg *)host->hostdata; | |
2291 | cfg->host = host; | |
2292 | rc = alloc_mem(cfg); | |
2293 | if (rc) { | |
fa3f2c6e | 2294 | dev_err(&pdev->dev, "%s: call to alloc_mem failed!\n", |
c21e0bbf MO |
2295 | __func__); |
2296 | rc = -ENOMEM; | |
8b5b1e87 | 2297 | scsi_host_put(cfg->host); |
c21e0bbf MO |
2298 | goto out; |
2299 | } | |
2300 | ||
2301 | cfg->init_state = INIT_STATE_NONE; | |
2302 | cfg->dev = pdev; | |
17ead26f | 2303 | cfg->cxl_fops = cxlflash_cxl_fops; |
2cb79266 MO |
2304 | |
2305 | /* | |
2306 | * The promoted LUNs move to the top of the LUN table. The rest stay | |
2307 | * on the bottom half. The bottom half grows from the end | |
2308 | * (index = 255), whereas the top half grows from the beginning | |
2309 | * (index = 0). | |
2310 | */ | |
2311 | cfg->promote_lun_index = 0; | |
2312 | cfg->last_lun_index[0] = CXLFLASH_NUM_VLUNS/2 - 1; | |
2313 | cfg->last_lun_index[1] = CXLFLASH_NUM_VLUNS/2 - 1; | |
2314 | ||
c21e0bbf | 2315 | cfg->dev_id = (struct pci_device_id *)dev_id; |
c21e0bbf MO |
2316 | |
2317 | init_waitqueue_head(&cfg->tmf_waitq); | |
439e85c1 | 2318 | init_waitqueue_head(&cfg->reset_waitq); |
c21e0bbf MO |
2319 | |
2320 | INIT_WORK(&cfg->work_q, cxlflash_worker_thread); | |
2321 | cfg->lr_state = LINK_RESET_INVALID; | |
2322 | cfg->lr_port = -1; | |
0d73122c | 2323 | spin_lock_init(&cfg->tmf_slock); |
65be2c79 MO |
2324 | mutex_init(&cfg->ctx_tbl_list_mutex); |
2325 | mutex_init(&cfg->ctx_recovery_mutex); | |
0a27ae51 | 2326 | init_rwsem(&cfg->ioctl_rwsem); |
65be2c79 MO |
2327 | INIT_LIST_HEAD(&cfg->ctx_err_recovery); |
2328 | INIT_LIST_HEAD(&cfg->lluns); | |
c21e0bbf MO |
2329 | |
2330 | pci_set_drvdata(pdev, cfg); | |
2331 | ||
c21e0bbf MO |
2332 | cfg->cxl_afu = cxl_pci_to_afu(pdev); |
2333 | ||
2334 | rc = init_pci(cfg); | |
2335 | if (rc) { | |
2336 | dev_err(&pdev->dev, "%s: call to init_pci " | |
2337 | "failed rc=%d!\n", __func__, rc); | |
2338 | goto out_remove; | |
2339 | } | |
2340 | cfg->init_state = INIT_STATE_PCI; | |
2341 | ||
2342 | rc = init_afu(cfg); | |
2343 | if (rc) { | |
2344 | dev_err(&pdev->dev, "%s: call to init_afu " | |
2345 | "failed rc=%d!\n", __func__, rc); | |
2346 | goto out_remove; | |
2347 | } | |
2348 | cfg->init_state = INIT_STATE_AFU; | |
2349 | ||
c21e0bbf MO |
2350 | rc = init_scsi(cfg); |
2351 | if (rc) { | |
2352 | dev_err(&pdev->dev, "%s: call to init_scsi " | |
2353 | "failed rc=%d!\n", __func__, rc); | |
2354 | goto out_remove; | |
2355 | } | |
2356 | cfg->init_state = INIT_STATE_SCSI; | |
2357 | ||
2358 | out: | |
2359 | pr_debug("%s: returning rc=%d\n", __func__, rc); | |
2360 | return rc; | |
2361 | ||
2362 | out_remove: | |
2363 | cxlflash_remove(pdev); | |
2364 | goto out; | |
2365 | } | |
2366 | ||
5cdac81a MO |
2367 | /** |
2368 | * cxlflash_pci_error_detected() - called when a PCI error is detected | |
2369 | * @pdev: PCI device struct. | |
2370 | * @state: PCI channel state. | |
2371 | * | |
1d3324c3 MO |
2372 | * When an EEH occurs during an active reset, wait until the reset is |
2373 | * complete and then take action based upon the device state. | |
2374 | * | |
5cdac81a MO |
2375 | * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT |
2376 | */ | |
2377 | static pci_ers_result_t cxlflash_pci_error_detected(struct pci_dev *pdev, | |
2378 | pci_channel_state_t state) | |
2379 | { | |
65be2c79 | 2380 | int rc = 0; |
5cdac81a MO |
2381 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); |
2382 | struct device *dev = &cfg->dev->dev; | |
2383 | ||
2384 | dev_dbg(dev, "%s: pdev=%p state=%u\n", __func__, pdev, state); | |
2385 | ||
2386 | switch (state) { | |
2387 | case pci_channel_io_frozen: | |
1d3324c3 MO |
2388 | wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); |
2389 | if (cfg->state == STATE_FAILTERM) | |
2390 | return PCI_ERS_RESULT_DISCONNECT; | |
2391 | ||
439e85c1 | 2392 | cfg->state = STATE_RESET; |
5cdac81a | 2393 | scsi_block_requests(cfg->host); |
0a27ae51 | 2394 | drain_ioctls(cfg); |
65be2c79 MO |
2395 | rc = cxlflash_mark_contexts_error(cfg); |
2396 | if (unlikely(rc)) | |
2397 | dev_err(dev, "%s: Failed to mark user contexts!(%d)\n", | |
2398 | __func__, rc); | |
9526f360 | 2399 | term_afu(cfg); |
5cdac81a MO |
2400 | return PCI_ERS_RESULT_NEED_RESET; |
2401 | case pci_channel_io_perm_failure: | |
2402 | cfg->state = STATE_FAILTERM; | |
439e85c1 | 2403 | wake_up_all(&cfg->reset_waitq); |
5cdac81a MO |
2404 | scsi_unblock_requests(cfg->host); |
2405 | return PCI_ERS_RESULT_DISCONNECT; | |
2406 | default: | |
2407 | break; | |
2408 | } | |
2409 | return PCI_ERS_RESULT_NEED_RESET; | |
2410 | } | |
2411 | ||
2412 | /** | |
2413 | * cxlflash_pci_slot_reset() - called when PCI slot has been reset | |
2414 | * @pdev: PCI device struct. | |
2415 | * | |
2416 | * This routine is called by the pci error recovery code after the PCI | |
2417 | * slot has been reset, just before we should resume normal operations. | |
2418 | * | |
2419 | * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT | |
2420 | */ | |
2421 | static pci_ers_result_t cxlflash_pci_slot_reset(struct pci_dev *pdev) | |
2422 | { | |
2423 | int rc = 0; | |
2424 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); | |
2425 | struct device *dev = &cfg->dev->dev; | |
2426 | ||
2427 | dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev); | |
2428 | ||
2429 | rc = init_afu(cfg); | |
2430 | if (unlikely(rc)) { | |
2431 | dev_err(dev, "%s: EEH recovery failed! (%d)\n", __func__, rc); | |
2432 | return PCI_ERS_RESULT_DISCONNECT; | |
2433 | } | |
2434 | ||
2435 | return PCI_ERS_RESULT_RECOVERED; | |
2436 | } | |
2437 | ||
2438 | /** | |
2439 | * cxlflash_pci_resume() - called when normal operation can resume | |
2440 | * @pdev: PCI device struct | |
2441 | */ | |
2442 | static void cxlflash_pci_resume(struct pci_dev *pdev) | |
2443 | { | |
2444 | struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); | |
2445 | struct device *dev = &cfg->dev->dev; | |
2446 | ||
2447 | dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev); | |
2448 | ||
2449 | cfg->state = STATE_NORMAL; | |
439e85c1 | 2450 | wake_up_all(&cfg->reset_waitq); |
5cdac81a MO |
2451 | scsi_unblock_requests(cfg->host); |
2452 | } | |
2453 | ||
2454 | static const struct pci_error_handlers cxlflash_err_handler = { | |
2455 | .error_detected = cxlflash_pci_error_detected, | |
2456 | .slot_reset = cxlflash_pci_slot_reset, | |
2457 | .resume = cxlflash_pci_resume, | |
2458 | }; | |
2459 | ||
c21e0bbf MO |
2460 | /* |
2461 | * PCI device structure | |
2462 | */ | |
2463 | static struct pci_driver cxlflash_driver = { | |
2464 | .name = CXLFLASH_NAME, | |
2465 | .id_table = cxlflash_pci_table, | |
2466 | .probe = cxlflash_probe, | |
2467 | .remove = cxlflash_remove, | |
babf985d | 2468 | .shutdown = cxlflash_remove, |
5cdac81a | 2469 | .err_handler = &cxlflash_err_handler, |
c21e0bbf MO |
2470 | }; |
2471 | ||
2472 | /** | |
2473 | * init_cxlflash() - module entry point | |
2474 | * | |
1284fb0c | 2475 | * Return: 0 on success, -errno on failure |
c21e0bbf MO |
2476 | */ |
2477 | static int __init init_cxlflash(void) | |
2478 | { | |
85599218 | 2479 | pr_info("%s: %s\n", __func__, CXLFLASH_ADAPTER_NAME); |
c21e0bbf | 2480 | |
65be2c79 MO |
2481 | cxlflash_list_init(); |
2482 | ||
c21e0bbf MO |
2483 | return pci_register_driver(&cxlflash_driver); |
2484 | } | |
2485 | ||
2486 | /** | |
2487 | * exit_cxlflash() - module exit point | |
2488 | */ | |
2489 | static void __exit exit_cxlflash(void) | |
2490 | { | |
65be2c79 MO |
2491 | cxlflash_term_global_luns(); |
2492 | cxlflash_free_errpage(); | |
2493 | ||
c21e0bbf MO |
2494 | pci_unregister_driver(&cxlflash_driver); |
2495 | } | |
2496 | ||
2497 | module_init(init_cxlflash); | |
2498 | module_exit(exit_cxlflash); |