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65be2c79 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/file.h> | |
17 | #include <linux/syscalls.h> | |
18 | #include <misc/cxl.h> | |
19 | #include <asm/unaligned.h> | |
20 | ||
21 | #include <scsi/scsi.h> | |
22 | #include <scsi/scsi_host.h> | |
23 | #include <scsi/scsi_cmnd.h> | |
24 | #include <scsi/scsi_eh.h> | |
25 | #include <uapi/scsi/cxlflash_ioctl.h> | |
26 | ||
27 | #include "sislite.h" | |
28 | #include "common.h" | |
2cb79266 | 29 | #include "vlun.h" |
65be2c79 MO |
30 | #include "superpipe.h" |
31 | ||
32 | struct cxlflash_global global; | |
33 | ||
2cb79266 MO |
34 | /** |
35 | * marshal_rele_to_resize() - translate release to resize structure | |
36 | * @rele: Source structure from which to translate/copy. | |
37 | * @resize: Destination structure for the translate/copy. | |
38 | */ | |
39 | static void marshal_rele_to_resize(struct dk_cxlflash_release *release, | |
40 | struct dk_cxlflash_resize *resize) | |
41 | { | |
42 | resize->hdr = release->hdr; | |
43 | resize->context_id = release->context_id; | |
44 | resize->rsrc_handle = release->rsrc_handle; | |
45 | } | |
46 | ||
65be2c79 MO |
47 | /** |
48 | * marshal_det_to_rele() - translate detach to release structure | |
49 | * @detach: Destination structure for the translate/copy. | |
50 | * @rele: Source structure from which to translate/copy. | |
51 | */ | |
52 | static void marshal_det_to_rele(struct dk_cxlflash_detach *detach, | |
53 | struct dk_cxlflash_release *release) | |
54 | { | |
55 | release->hdr = detach->hdr; | |
56 | release->context_id = detach->context_id; | |
57 | } | |
58 | ||
59 | /** | |
60 | * cxlflash_free_errpage() - frees resources associated with global error page | |
61 | */ | |
62 | void cxlflash_free_errpage(void) | |
63 | { | |
64 | ||
65 | mutex_lock(&global.mutex); | |
66 | if (global.err_page) { | |
67 | __free_page(global.err_page); | |
68 | global.err_page = NULL; | |
69 | } | |
70 | mutex_unlock(&global.mutex); | |
71 | } | |
72 | ||
73 | /** | |
74 | * cxlflash_stop_term_user_contexts() - stops/terminates known user contexts | |
75 | * @cfg: Internal structure associated with the host. | |
76 | * | |
77 | * When the host needs to go down, all users must be quiesced and their | |
78 | * memory freed. This is accomplished by putting the contexts in error | |
f15fbf8d | 79 | * state which will notify the user and let them 'drive' the tear down. |
65be2c79 MO |
80 | * Meanwhile, this routine camps until all user contexts have been removed. |
81 | */ | |
82 | void cxlflash_stop_term_user_contexts(struct cxlflash_cfg *cfg) | |
83 | { | |
84 | struct device *dev = &cfg->dev->dev; | |
85 | int i, found; | |
86 | ||
87 | cxlflash_mark_contexts_error(cfg); | |
88 | ||
89 | while (true) { | |
90 | found = false; | |
91 | ||
92 | for (i = 0; i < MAX_CONTEXT; i++) | |
93 | if (cfg->ctx_tbl[i]) { | |
94 | found = true; | |
95 | break; | |
96 | } | |
97 | ||
98 | if (!found && list_empty(&cfg->ctx_err_recovery)) | |
99 | return; | |
100 | ||
101 | dev_dbg(dev, "%s: Wait for user contexts to quiesce...\n", | |
102 | __func__); | |
439e85c1 | 103 | wake_up_all(&cfg->reset_waitq); |
65be2c79 MO |
104 | ssleep(1); |
105 | } | |
106 | } | |
107 | ||
108 | /** | |
109 | * find_error_context() - locates a context by cookie on the error recovery list | |
110 | * @cfg: Internal structure associated with the host. | |
111 | * @rctxid: Desired context by id. | |
112 | * @file: Desired context by file. | |
113 | * | |
114 | * Return: Found context on success, NULL on failure | |
115 | */ | |
116 | static struct ctx_info *find_error_context(struct cxlflash_cfg *cfg, u64 rctxid, | |
117 | struct file *file) | |
118 | { | |
119 | struct ctx_info *ctxi; | |
120 | ||
121 | list_for_each_entry(ctxi, &cfg->ctx_err_recovery, list) | |
122 | if ((ctxi->ctxid == rctxid) || (ctxi->file == file)) | |
123 | return ctxi; | |
124 | ||
125 | return NULL; | |
126 | } | |
127 | ||
128 | /** | |
129 | * get_context() - obtains a validated and locked context reference | |
130 | * @cfg: Internal structure associated with the host. | |
131 | * @rctxid: Desired context (raw, un-decoded format). | |
132 | * @arg: LUN information or file associated with request. | |
133 | * @ctx_ctrl: Control information to 'steer' desired lookup. | |
134 | * | |
135 | * NOTE: despite the name pid, in linux, current->pid actually refers | |
136 | * to the lightweight process id (tid) and can change if the process is | |
137 | * multi threaded. The tgid remains constant for the process and only changes | |
138 | * when the process of fork. For all intents and purposes, think of tgid | |
139 | * as a pid in the traditional sense. | |
140 | * | |
141 | * Return: Validated context on success, NULL on failure | |
142 | */ | |
143 | struct ctx_info *get_context(struct cxlflash_cfg *cfg, u64 rctxid, | |
144 | void *arg, enum ctx_ctrl ctx_ctrl) | |
145 | { | |
146 | struct device *dev = &cfg->dev->dev; | |
147 | struct ctx_info *ctxi = NULL; | |
148 | struct lun_access *lun_access = NULL; | |
149 | struct file *file = NULL; | |
150 | struct llun_info *lli = arg; | |
151 | u64 ctxid = DECODE_CTXID(rctxid); | |
152 | int rc; | |
153 | pid_t pid = current->tgid, ctxpid = 0; | |
154 | ||
155 | if (ctx_ctrl & CTX_CTRL_FILE) { | |
156 | lli = NULL; | |
157 | file = (struct file *)arg; | |
158 | } | |
159 | ||
160 | if (ctx_ctrl & CTX_CTRL_CLONE) | |
161 | pid = current->parent->tgid; | |
162 | ||
163 | if (likely(ctxid < MAX_CONTEXT)) { | |
164 | while (true) { | |
a82544c7 | 165 | mutex_lock(&cfg->ctx_tbl_list_mutex); |
65be2c79 MO |
166 | ctxi = cfg->ctx_tbl[ctxid]; |
167 | if (ctxi) | |
168 | if ((file && (ctxi->file != file)) || | |
169 | (!file && (ctxi->ctxid != rctxid))) | |
170 | ctxi = NULL; | |
171 | ||
172 | if ((ctx_ctrl & CTX_CTRL_ERR) || | |
173 | (!ctxi && (ctx_ctrl & CTX_CTRL_ERR_FALLBACK))) | |
174 | ctxi = find_error_context(cfg, rctxid, file); | |
175 | if (!ctxi) { | |
176 | mutex_unlock(&cfg->ctx_tbl_list_mutex); | |
177 | goto out; | |
178 | } | |
179 | ||
180 | /* | |
181 | * Need to acquire ownership of the context while still | |
182 | * under the table/list lock to serialize with a remove | |
183 | * thread. Use the 'try' to avoid stalling the | |
184 | * table/list lock for a single context. | |
185 | * | |
186 | * Note that the lock order is: | |
187 | * | |
188 | * cfg->ctx_tbl_list_mutex -> ctxi->mutex | |
189 | * | |
190 | * Therefore release ctx_tbl_list_mutex before retrying. | |
191 | */ | |
192 | rc = mutex_trylock(&ctxi->mutex); | |
193 | mutex_unlock(&cfg->ctx_tbl_list_mutex); | |
194 | if (rc) | |
195 | break; /* got the context's lock! */ | |
196 | } | |
197 | ||
198 | if (ctxi->unavail) | |
199 | goto denied; | |
200 | ||
201 | ctxpid = ctxi->pid; | |
202 | if (likely(!(ctx_ctrl & CTX_CTRL_NOPID))) | |
203 | if (pid != ctxpid) | |
204 | goto denied; | |
205 | ||
206 | if (lli) { | |
207 | list_for_each_entry(lun_access, &ctxi->luns, list) | |
208 | if (lun_access->lli == lli) | |
209 | goto out; | |
210 | goto denied; | |
211 | } | |
212 | } | |
213 | ||
214 | out: | |
215 | dev_dbg(dev, "%s: rctxid=%016llX ctxinfo=%p ctxpid=%u pid=%u " | |
216 | "ctx_ctrl=%u\n", __func__, rctxid, ctxi, ctxpid, pid, | |
217 | ctx_ctrl); | |
218 | ||
219 | return ctxi; | |
220 | ||
221 | denied: | |
222 | mutex_unlock(&ctxi->mutex); | |
223 | ctxi = NULL; | |
224 | goto out; | |
225 | } | |
226 | ||
227 | /** | |
228 | * put_context() - release a context that was retrieved from get_context() | |
229 | * @ctxi: Context to release. | |
230 | * | |
231 | * For now, releasing the context equates to unlocking it's mutex. | |
232 | */ | |
233 | void put_context(struct ctx_info *ctxi) | |
234 | { | |
235 | mutex_unlock(&ctxi->mutex); | |
236 | } | |
237 | ||
238 | /** | |
239 | * afu_attach() - attach a context to the AFU | |
240 | * @cfg: Internal structure associated with the host. | |
241 | * @ctxi: Context to attach. | |
242 | * | |
243 | * Upon setting the context capabilities, they must be confirmed with | |
244 | * a read back operation as the context might have been closed since | |
245 | * the mailbox was unlocked. When this occurs, registration is failed. | |
246 | * | |
247 | * Return: 0 on success, -errno on failure | |
248 | */ | |
249 | static int afu_attach(struct cxlflash_cfg *cfg, struct ctx_info *ctxi) | |
250 | { | |
251 | struct device *dev = &cfg->dev->dev; | |
252 | struct afu *afu = cfg->afu; | |
1786f4a0 | 253 | struct sisl_ctrl_map __iomem *ctrl_map = ctxi->ctrl_map; |
65be2c79 MO |
254 | int rc = 0; |
255 | u64 val; | |
256 | ||
257 | /* Unlock cap and restrict user to read/write cmds in translated mode */ | |
258 | readq_be(&ctrl_map->mbox_r); | |
259 | val = (SISL_CTX_CAP_READ_CMD | SISL_CTX_CAP_WRITE_CMD); | |
260 | writeq_be(val, &ctrl_map->ctx_cap); | |
261 | val = readq_be(&ctrl_map->ctx_cap); | |
262 | if (val != (SISL_CTX_CAP_READ_CMD | SISL_CTX_CAP_WRITE_CMD)) { | |
263 | dev_err(dev, "%s: ctx may be closed val=%016llX\n", | |
264 | __func__, val); | |
265 | rc = -EAGAIN; | |
266 | goto out; | |
267 | } | |
268 | ||
269 | /* Set up MMIO registers pointing to the RHT */ | |
270 | writeq_be((u64)ctxi->rht_start, &ctrl_map->rht_start); | |
271 | val = SISL_RHT_CNT_ID((u64)MAX_RHT_PER_CONTEXT, (u64)(afu->ctx_hndl)); | |
272 | writeq_be(val, &ctrl_map->rht_cnt_id); | |
273 | out: | |
274 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); | |
275 | return rc; | |
276 | } | |
277 | ||
278 | /** | |
279 | * read_cap16() - issues a SCSI READ_CAP16 command | |
280 | * @sdev: SCSI device associated with LUN. | |
281 | * @lli: LUN destined for capacity request. | |
282 | * | |
aacb4ff6 MO |
283 | * The READ_CAP16 can take quite a while to complete. Should an EEH occur while |
284 | * in scsi_execute(), the EEH handler will attempt to recover. As part of the | |
285 | * recovery, the handler drains all currently running ioctls, waiting until they | |
286 | * have completed before proceeding with a reset. As this routine is used on the | |
287 | * ioctl path, this can create a condition where the EEH handler becomes stuck, | |
288 | * infinitely waiting for this ioctl thread. To avoid this behavior, temporarily | |
289 | * unmark this thread as an ioctl thread by releasing the ioctl read semaphore. | |
290 | * This will allow the EEH handler to proceed with a recovery while this thread | |
291 | * is still running. Once the scsi_execute() returns, reacquire the ioctl read | |
292 | * semaphore and check the adapter state in case it changed while inside of | |
293 | * scsi_execute(). The state check will wait if the adapter is still being | |
294 | * recovered or return a failure if the recovery failed. In the event that the | |
295 | * adapter reset failed, simply return the failure as the ioctl would be unable | |
296 | * to continue. | |
297 | * | |
298 | * Note that the above puts a requirement on this routine to only be called on | |
299 | * an ioctl thread. | |
300 | * | |
65be2c79 MO |
301 | * Return: 0 on success, -errno on failure |
302 | */ | |
303 | static int read_cap16(struct scsi_device *sdev, struct llun_info *lli) | |
304 | { | |
305 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata; | |
306 | struct device *dev = &cfg->dev->dev; | |
307 | struct glun_info *gli = lli->parent; | |
308 | u8 *cmd_buf = NULL; | |
309 | u8 *scsi_cmd = NULL; | |
310 | u8 *sense_buf = NULL; | |
311 | int rc = 0; | |
312 | int result = 0; | |
313 | int retry_cnt = 0; | |
471a5a60 | 314 | u32 to = CMD_TIMEOUT * HZ; |
65be2c79 MO |
315 | |
316 | retry: | |
317 | cmd_buf = kzalloc(CMD_BUFSIZE, GFP_KERNEL); | |
318 | scsi_cmd = kzalloc(MAX_COMMAND_SIZE, GFP_KERNEL); | |
319 | sense_buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL); | |
320 | if (unlikely(!cmd_buf || !scsi_cmd || !sense_buf)) { | |
321 | rc = -ENOMEM; | |
322 | goto out; | |
323 | } | |
324 | ||
325 | scsi_cmd[0] = SERVICE_ACTION_IN_16; /* read cap(16) */ | |
326 | scsi_cmd[1] = SAI_READ_CAPACITY_16; /* service action */ | |
327 | put_unaligned_be32(CMD_BUFSIZE, &scsi_cmd[10]); | |
328 | ||
329 | dev_dbg(dev, "%s: %ssending cmd(0x%x)\n", __func__, | |
330 | retry_cnt ? "re" : "", scsi_cmd[0]); | |
331 | ||
aacb4ff6 MO |
332 | /* Drop the ioctl read semahpore across lengthy call */ |
333 | up_read(&cfg->ioctl_rwsem); | |
65be2c79 | 334 | result = scsi_execute(sdev, scsi_cmd, DMA_FROM_DEVICE, cmd_buf, |
471a5a60 | 335 | CMD_BUFSIZE, sense_buf, to, CMD_RETRIES, 0, NULL); |
aacb4ff6 MO |
336 | down_read(&cfg->ioctl_rwsem); |
337 | rc = check_state(cfg); | |
338 | if (rc) { | |
339 | dev_err(dev, "%s: Failed state! result=0x08%X\n", | |
340 | __func__, result); | |
341 | rc = -ENODEV; | |
342 | goto out; | |
343 | } | |
65be2c79 MO |
344 | |
345 | if (driver_byte(result) == DRIVER_SENSE) { | |
346 | result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */ | |
347 | if (result & SAM_STAT_CHECK_CONDITION) { | |
348 | struct scsi_sense_hdr sshdr; | |
349 | ||
350 | scsi_normalize_sense(sense_buf, SCSI_SENSE_BUFFERSIZE, | |
351 | &sshdr); | |
352 | switch (sshdr.sense_key) { | |
353 | case NO_SENSE: | |
354 | case RECOVERED_ERROR: | |
355 | /* fall through */ | |
356 | case NOT_READY: | |
357 | result &= ~SAM_STAT_CHECK_CONDITION; | |
358 | break; | |
359 | case UNIT_ATTENTION: | |
360 | switch (sshdr.asc) { | |
361 | case 0x29: /* Power on Reset or Device Reset */ | |
362 | /* fall through */ | |
363 | case 0x2A: /* Device capacity changed */ | |
364 | case 0x3F: /* Report LUNs changed */ | |
365 | /* Retry the command once more */ | |
366 | if (retry_cnt++ < 1) { | |
367 | kfree(cmd_buf); | |
368 | kfree(scsi_cmd); | |
369 | kfree(sense_buf); | |
370 | goto retry; | |
371 | } | |
372 | } | |
373 | break; | |
374 | default: | |
375 | break; | |
376 | } | |
377 | } | |
378 | } | |
379 | ||
380 | if (result) { | |
381 | dev_err(dev, "%s: command failed, result=0x%x\n", | |
382 | __func__, result); | |
383 | rc = -EIO; | |
384 | goto out; | |
385 | } | |
386 | ||
387 | /* | |
388 | * Read cap was successful, grab values from the buffer; | |
389 | * note that we don't need to worry about unaligned access | |
390 | * as the buffer is allocated on an aligned boundary. | |
391 | */ | |
392 | mutex_lock(&gli->mutex); | |
1786f4a0 MO |
393 | gli->max_lba = be64_to_cpu(*((__be64 *)&cmd_buf[0])); |
394 | gli->blk_len = be32_to_cpu(*((__be32 *)&cmd_buf[8])); | |
65be2c79 MO |
395 | mutex_unlock(&gli->mutex); |
396 | ||
397 | out: | |
398 | kfree(cmd_buf); | |
399 | kfree(scsi_cmd); | |
400 | kfree(sense_buf); | |
401 | ||
402 | dev_dbg(dev, "%s: maxlba=%lld blklen=%d rc=%d\n", | |
403 | __func__, gli->max_lba, gli->blk_len, rc); | |
404 | return rc; | |
405 | } | |
406 | ||
407 | /** | |
408 | * get_rhte() - obtains validated resource handle table entry reference | |
409 | * @ctxi: Context owning the resource handle. | |
410 | * @rhndl: Resource handle associated with entry. | |
411 | * @lli: LUN associated with request. | |
412 | * | |
413 | * Return: Validated RHTE on success, NULL on failure | |
414 | */ | |
415 | struct sisl_rht_entry *get_rhte(struct ctx_info *ctxi, res_hndl_t rhndl, | |
416 | struct llun_info *lli) | |
417 | { | |
418 | struct sisl_rht_entry *rhte = NULL; | |
419 | ||
420 | if (unlikely(!ctxi->rht_start)) { | |
421 | pr_debug("%s: Context does not have allocated RHT!\n", | |
422 | __func__); | |
423 | goto out; | |
424 | } | |
425 | ||
426 | if (unlikely(rhndl >= MAX_RHT_PER_CONTEXT)) { | |
427 | pr_debug("%s: Bad resource handle! (%d)\n", __func__, rhndl); | |
428 | goto out; | |
429 | } | |
430 | ||
431 | if (unlikely(ctxi->rht_lun[rhndl] != lli)) { | |
432 | pr_debug("%s: Bad resource handle LUN! (%d)\n", | |
433 | __func__, rhndl); | |
434 | goto out; | |
435 | } | |
436 | ||
437 | rhte = &ctxi->rht_start[rhndl]; | |
438 | if (unlikely(rhte->nmask == 0)) { | |
439 | pr_debug("%s: Unopened resource handle! (%d)\n", | |
440 | __func__, rhndl); | |
441 | rhte = NULL; | |
442 | goto out; | |
443 | } | |
444 | ||
445 | out: | |
446 | return rhte; | |
447 | } | |
448 | ||
449 | /** | |
450 | * rhte_checkout() - obtains free/empty resource handle table entry | |
451 | * @ctxi: Context owning the resource handle. | |
452 | * @lli: LUN associated with request. | |
453 | * | |
454 | * Return: Free RHTE on success, NULL on failure | |
455 | */ | |
456 | struct sisl_rht_entry *rhte_checkout(struct ctx_info *ctxi, | |
457 | struct llun_info *lli) | |
458 | { | |
459 | struct sisl_rht_entry *rhte = NULL; | |
460 | int i; | |
461 | ||
462 | /* Find a free RHT entry */ | |
463 | for (i = 0; i < MAX_RHT_PER_CONTEXT; i++) | |
464 | if (ctxi->rht_start[i].nmask == 0) { | |
465 | rhte = &ctxi->rht_start[i]; | |
466 | ctxi->rht_out++; | |
467 | break; | |
468 | } | |
469 | ||
470 | if (likely(rhte)) | |
471 | ctxi->rht_lun[i] = lli; | |
472 | ||
473 | pr_debug("%s: returning rhte=%p (%d)\n", __func__, rhte, i); | |
474 | return rhte; | |
475 | } | |
476 | ||
477 | /** | |
478 | * rhte_checkin() - releases a resource handle table entry | |
479 | * @ctxi: Context owning the resource handle. | |
480 | * @rhte: RHTE to release. | |
481 | */ | |
482 | void rhte_checkin(struct ctx_info *ctxi, | |
483 | struct sisl_rht_entry *rhte) | |
484 | { | |
485 | u32 rsrc_handle = rhte - ctxi->rht_start; | |
486 | ||
487 | rhte->nmask = 0; | |
488 | rhte->fp = 0; | |
489 | ctxi->rht_out--; | |
490 | ctxi->rht_lun[rsrc_handle] = NULL; | |
2cb79266 | 491 | ctxi->rht_needs_ws[rsrc_handle] = false; |
65be2c79 MO |
492 | } |
493 | ||
494 | /** | |
495 | * rhte_format1() - populates a RHTE for format 1 | |
496 | * @rhte: RHTE to populate. | |
497 | * @lun_id: LUN ID of LUN associated with RHTE. | |
498 | * @perm: Desired permissions for RHTE. | |
499 | * @port_sel: Port selection mask | |
500 | */ | |
501 | static void rht_format1(struct sisl_rht_entry *rhte, u64 lun_id, u32 perm, | |
502 | u32 port_sel) | |
503 | { | |
504 | /* | |
505 | * Populate the Format 1 RHT entry for direct access (physical | |
506 | * LUN) using the synchronization sequence defined in the | |
507 | * SISLite specification. | |
508 | */ | |
509 | struct sisl_rht_entry_f1 dummy = { 0 }; | |
510 | struct sisl_rht_entry_f1 *rhte_f1 = (struct sisl_rht_entry_f1 *)rhte; | |
511 | ||
512 | memset(rhte_f1, 0, sizeof(*rhte_f1)); | |
513 | rhte_f1->fp = SISL_RHT_FP(1U, 0); | |
514 | dma_wmb(); /* Make setting of format bit visible */ | |
515 | ||
516 | rhte_f1->lun_id = lun_id; | |
517 | dma_wmb(); /* Make setting of LUN id visible */ | |
518 | ||
519 | /* | |
520 | * Use a dummy RHT Format 1 entry to build the second dword | |
521 | * of the entry that must be populated in a single write when | |
522 | * enabled (valid bit set to TRUE). | |
523 | */ | |
524 | dummy.valid = 0x80; | |
525 | dummy.fp = SISL_RHT_FP(1U, perm); | |
526 | dummy.port_sel = port_sel; | |
527 | rhte_f1->dw = dummy.dw; | |
528 | ||
529 | dma_wmb(); /* Make remaining RHT entry fields visible */ | |
530 | } | |
531 | ||
532 | /** | |
533 | * cxlflash_lun_attach() - attaches a user to a LUN and manages the LUN's mode | |
534 | * @gli: LUN to attach. | |
535 | * @mode: Desired mode of the LUN. | |
536 | * @locked: Mutex status on current thread. | |
537 | * | |
538 | * Return: 0 on success, -errno on failure | |
539 | */ | |
540 | int cxlflash_lun_attach(struct glun_info *gli, enum lun_mode mode, bool locked) | |
541 | { | |
542 | int rc = 0; | |
543 | ||
544 | if (!locked) | |
545 | mutex_lock(&gli->mutex); | |
546 | ||
547 | if (gli->mode == MODE_NONE) | |
548 | gli->mode = mode; | |
549 | else if (gli->mode != mode) { | |
550 | pr_debug("%s: LUN operating in mode %d, requested mode %d\n", | |
551 | __func__, gli->mode, mode); | |
552 | rc = -EINVAL; | |
553 | goto out; | |
554 | } | |
555 | ||
556 | gli->users++; | |
557 | WARN_ON(gli->users <= 0); | |
558 | out: | |
559 | pr_debug("%s: Returning rc=%d gli->mode=%u gli->users=%u\n", | |
560 | __func__, rc, gli->mode, gli->users); | |
561 | if (!locked) | |
562 | mutex_unlock(&gli->mutex); | |
563 | return rc; | |
564 | } | |
565 | ||
566 | /** | |
567 | * cxlflash_lun_detach() - detaches a user from a LUN and resets the LUN's mode | |
568 | * @gli: LUN to detach. | |
2cb79266 MO |
569 | * |
570 | * When resetting the mode, terminate block allocation resources as they | |
571 | * are no longer required (service is safe to call even when block allocation | |
572 | * resources were not present - such as when transitioning from physical mode). | |
573 | * These resources will be reallocated when needed (subsequent transition to | |
574 | * virtual mode). | |
65be2c79 MO |
575 | */ |
576 | void cxlflash_lun_detach(struct glun_info *gli) | |
577 | { | |
578 | mutex_lock(&gli->mutex); | |
579 | WARN_ON(gli->mode == MODE_NONE); | |
2cb79266 | 580 | if (--gli->users == 0) { |
65be2c79 | 581 | gli->mode = MODE_NONE; |
2cb79266 MO |
582 | cxlflash_ba_terminate(&gli->blka.ba_lun); |
583 | } | |
65be2c79 MO |
584 | pr_debug("%s: gli->users=%u\n", __func__, gli->users); |
585 | WARN_ON(gli->users < 0); | |
586 | mutex_unlock(&gli->mutex); | |
587 | } | |
588 | ||
589 | /** | |
590 | * _cxlflash_disk_release() - releases the specified resource entry | |
591 | * @sdev: SCSI device associated with LUN. | |
592 | * @ctxi: Context owning resources. | |
593 | * @release: Release ioctl data structure. | |
594 | * | |
2cb79266 MO |
595 | * For LUNs in virtual mode, the virtual LUN associated with the specified |
596 | * resource handle is resized to 0 prior to releasing the RHTE. Note that the | |
597 | * AFU sync should _not_ be performed when the context is sitting on the error | |
598 | * recovery list. A context on the error recovery list is not known to the AFU | |
599 | * due to reset. When the context is recovered, it will be reattached and made | |
600 | * known again to the AFU. | |
65be2c79 MO |
601 | * |
602 | * Return: 0 on success, -errno on failure | |
603 | */ | |
604 | int _cxlflash_disk_release(struct scsi_device *sdev, | |
605 | struct ctx_info *ctxi, | |
606 | struct dk_cxlflash_release *release) | |
607 | { | |
608 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata; | |
609 | struct device *dev = &cfg->dev->dev; | |
610 | struct llun_info *lli = sdev->hostdata; | |
611 | struct glun_info *gli = lli->parent; | |
612 | struct afu *afu = cfg->afu; | |
613 | bool put_ctx = false; | |
614 | ||
2cb79266 | 615 | struct dk_cxlflash_resize size; |
65be2c79 MO |
616 | res_hndl_t rhndl = release->rsrc_handle; |
617 | ||
618 | int rc = 0; | |
619 | u64 ctxid = DECODE_CTXID(release->context_id), | |
620 | rctxid = release->context_id; | |
621 | ||
622 | struct sisl_rht_entry *rhte; | |
623 | struct sisl_rht_entry_f1 *rhte_f1; | |
624 | ||
625 | dev_dbg(dev, "%s: ctxid=%llu rhndl=0x%llx gli->mode=%u gli->users=%u\n", | |
626 | __func__, ctxid, release->rsrc_handle, gli->mode, gli->users); | |
627 | ||
628 | if (!ctxi) { | |
629 | ctxi = get_context(cfg, rctxid, lli, CTX_CTRL_ERR_FALLBACK); | |
630 | if (unlikely(!ctxi)) { | |
631 | dev_dbg(dev, "%s: Bad context! (%llu)\n", | |
632 | __func__, ctxid); | |
633 | rc = -EINVAL; | |
634 | goto out; | |
635 | } | |
636 | ||
637 | put_ctx = true; | |
638 | } | |
639 | ||
640 | rhte = get_rhte(ctxi, rhndl, lli); | |
641 | if (unlikely(!rhte)) { | |
642 | dev_dbg(dev, "%s: Bad resource handle! (%d)\n", | |
643 | __func__, rhndl); | |
644 | rc = -EINVAL; | |
645 | goto out; | |
646 | } | |
647 | ||
2cb79266 MO |
648 | /* |
649 | * Resize to 0 for virtual LUNS by setting the size | |
650 | * to 0. This will clear LXT_START and LXT_CNT fields | |
651 | * in the RHT entry and properly sync with the AFU. | |
652 | * | |
653 | * Afterwards we clear the remaining fields. | |
654 | */ | |
65be2c79 | 655 | switch (gli->mode) { |
2cb79266 MO |
656 | case MODE_VIRTUAL: |
657 | marshal_rele_to_resize(release, &size); | |
658 | size.req_size = 0; | |
659 | rc = _cxlflash_vlun_resize(sdev, ctxi, &size); | |
660 | if (rc) { | |
661 | dev_dbg(dev, "%s: resize failed rc %d\n", __func__, rc); | |
662 | goto out; | |
663 | } | |
664 | ||
665 | break; | |
65be2c79 MO |
666 | case MODE_PHYSICAL: |
667 | /* | |
668 | * Clear the Format 1 RHT entry for direct access | |
669 | * (physical LUN) using the synchronization sequence | |
670 | * defined in the SISLite specification. | |
671 | */ | |
672 | rhte_f1 = (struct sisl_rht_entry_f1 *)rhte; | |
673 | ||
674 | rhte_f1->valid = 0; | |
675 | dma_wmb(); /* Make revocation of RHT entry visible */ | |
676 | ||
677 | rhte_f1->lun_id = 0; | |
678 | dma_wmb(); /* Make clearing of LUN id visible */ | |
679 | ||
680 | rhte_f1->dw = 0; | |
681 | dma_wmb(); /* Make RHT entry bottom-half clearing visible */ | |
682 | ||
683 | if (!ctxi->err_recovery_active) | |
684 | cxlflash_afu_sync(afu, ctxid, rhndl, AFU_HW_SYNC); | |
685 | break; | |
686 | default: | |
687 | WARN(1, "Unsupported LUN mode!"); | |
688 | goto out; | |
689 | } | |
690 | ||
691 | rhte_checkin(ctxi, rhte); | |
692 | cxlflash_lun_detach(gli); | |
693 | ||
694 | out: | |
695 | if (put_ctx) | |
696 | put_context(ctxi); | |
697 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); | |
698 | return rc; | |
699 | } | |
700 | ||
701 | int cxlflash_disk_release(struct scsi_device *sdev, | |
702 | struct dk_cxlflash_release *release) | |
703 | { | |
704 | return _cxlflash_disk_release(sdev, NULL, release); | |
705 | } | |
706 | ||
707 | /** | |
708 | * destroy_context() - releases a context | |
709 | * @cfg: Internal structure associated with the host. | |
710 | * @ctxi: Context to release. | |
711 | * | |
41b99e1a MO |
712 | * This routine is safe to be called with a a non-initialized context. |
713 | * Also note that the routine conditionally checks for the existence | |
714 | * of the context control map before clearing the RHT registers and | |
715 | * context capabilities because it is possible to destroy a context | |
716 | * while the context is in the error state (previous mapping was | |
717 | * removed [so there is no need to worry about clearing] and context | |
718 | * is waiting for a new mapping). | |
65be2c79 MO |
719 | */ |
720 | static void destroy_context(struct cxlflash_cfg *cfg, | |
721 | struct ctx_info *ctxi) | |
722 | { | |
723 | struct afu *afu = cfg->afu; | |
724 | ||
5e6632d1 MO |
725 | if (ctxi->initialized) { |
726 | WARN_ON(!list_empty(&ctxi->luns)); | |
65be2c79 | 727 | |
5e6632d1 MO |
728 | /* Clear RHT registers and drop all capabilities for context */ |
729 | if (afu->afu_map && ctxi->ctrl_map) { | |
730 | writeq_be(0, &ctxi->ctrl_map->rht_start); | |
731 | writeq_be(0, &ctxi->ctrl_map->rht_cnt_id); | |
732 | writeq_be(0, &ctxi->ctrl_map->ctx_cap); | |
733 | } | |
65be2c79 MO |
734 | } |
735 | ||
736 | /* Free memory associated with context */ | |
737 | free_page((ulong)ctxi->rht_start); | |
2cb79266 | 738 | kfree(ctxi->rht_needs_ws); |
65be2c79 MO |
739 | kfree(ctxi->rht_lun); |
740 | kfree(ctxi); | |
65be2c79 MO |
741 | } |
742 | ||
743 | /** | |
744 | * create_context() - allocates and initializes a context | |
745 | * @cfg: Internal structure associated with the host. | |
65be2c79 MO |
746 | * |
747 | * Return: Allocated context on success, NULL on failure | |
748 | */ | |
5e6632d1 | 749 | static struct ctx_info *create_context(struct cxlflash_cfg *cfg) |
65be2c79 MO |
750 | { |
751 | struct device *dev = &cfg->dev->dev; | |
65be2c79 MO |
752 | struct ctx_info *ctxi = NULL; |
753 | struct llun_info **lli = NULL; | |
e568e23f | 754 | u8 *ws = NULL; |
65be2c79 MO |
755 | struct sisl_rht_entry *rhte; |
756 | ||
757 | ctxi = kzalloc(sizeof(*ctxi), GFP_KERNEL); | |
758 | lli = kzalloc((MAX_RHT_PER_CONTEXT * sizeof(*lli)), GFP_KERNEL); | |
2cb79266 MO |
759 | ws = kzalloc((MAX_RHT_PER_CONTEXT * sizeof(*ws)), GFP_KERNEL); |
760 | if (unlikely(!ctxi || !lli || !ws)) { | |
65be2c79 MO |
761 | dev_err(dev, "%s: Unable to allocate context!\n", __func__); |
762 | goto err; | |
763 | } | |
764 | ||
765 | rhte = (struct sisl_rht_entry *)get_zeroed_page(GFP_KERNEL); | |
766 | if (unlikely(!rhte)) { | |
767 | dev_err(dev, "%s: Unable to allocate RHT!\n", __func__); | |
768 | goto err; | |
769 | } | |
770 | ||
771 | ctxi->rht_lun = lli; | |
2cb79266 | 772 | ctxi->rht_needs_ws = ws; |
65be2c79 | 773 | ctxi->rht_start = rhte; |
5e6632d1 MO |
774 | out: |
775 | return ctxi; | |
776 | ||
777 | err: | |
778 | kfree(ws); | |
779 | kfree(lli); | |
780 | kfree(ctxi); | |
781 | ctxi = NULL; | |
782 | goto out; | |
783 | } | |
784 | ||
785 | /** | |
786 | * init_context() - initializes a previously allocated context | |
787 | * @ctxi: Previously allocated context | |
788 | * @cfg: Internal structure associated with the host. | |
789 | * @ctx: Previously obtained CXL context reference. | |
790 | * @ctxid: Previously obtained process element associated with CXL context. | |
5e6632d1 MO |
791 | * @file: Previously obtained file associated with CXL context. |
792 | * @perms: User-specified permissions. | |
5e6632d1 MO |
793 | */ |
794 | static void init_context(struct ctx_info *ctxi, struct cxlflash_cfg *cfg, | |
de9f0b0c MO |
795 | struct cxl_context *ctx, int ctxid, struct file *file, |
796 | u32 perms) | |
5e6632d1 MO |
797 | { |
798 | struct afu *afu = cfg->afu; | |
65be2c79 | 799 | |
5e6632d1 | 800 | ctxi->rht_perms = perms; |
65be2c79 MO |
801 | ctxi->ctrl_map = &afu->afu_map->ctrls[ctxid].ctrl; |
802 | ctxi->ctxid = ENCODE_CTXID(ctxi, ctxid); | |
65be2c79 MO |
803 | ctxi->pid = current->tgid; /* tgid = pid */ |
804 | ctxi->ctx = ctx; | |
44ef38f9 | 805 | ctxi->cfg = cfg; |
65be2c79 | 806 | ctxi->file = file; |
5e6632d1 | 807 | ctxi->initialized = true; |
65be2c79 | 808 | mutex_init(&ctxi->mutex); |
888baf06 | 809 | kref_init(&ctxi->kref); |
65be2c79 MO |
810 | INIT_LIST_HEAD(&ctxi->luns); |
811 | INIT_LIST_HEAD(&ctxi->list); /* initialize for list_empty() */ | |
65be2c79 MO |
812 | } |
813 | ||
888baf06 MO |
814 | /** |
815 | * remove_context() - context kref release handler | |
816 | * @kref: Kernel reference associated with context to be removed. | |
817 | * | |
818 | * When a context no longer has any references it can safely be removed | |
819 | * from global access and destroyed. Note that it is assumed the thread | |
820 | * relinquishing access to the context holds its mutex. | |
821 | */ | |
822 | static void remove_context(struct kref *kref) | |
823 | { | |
824 | struct ctx_info *ctxi = container_of(kref, struct ctx_info, kref); | |
825 | struct cxlflash_cfg *cfg = ctxi->cfg; | |
888baf06 MO |
826 | u64 ctxid = DECODE_CTXID(ctxi->ctxid); |
827 | ||
828 | /* Remove context from table/error list */ | |
829 | WARN_ON(!mutex_is_locked(&ctxi->mutex)); | |
830 | ctxi->unavail = true; | |
831 | mutex_unlock(&ctxi->mutex); | |
832 | mutex_lock(&cfg->ctx_tbl_list_mutex); | |
833 | mutex_lock(&ctxi->mutex); | |
834 | ||
835 | if (!list_empty(&ctxi->list)) | |
836 | list_del(&ctxi->list); | |
837 | cfg->ctx_tbl[ctxid] = NULL; | |
838 | mutex_unlock(&cfg->ctx_tbl_list_mutex); | |
839 | mutex_unlock(&ctxi->mutex); | |
840 | ||
841 | /* Context now completely uncoupled/unreachable */ | |
888baf06 | 842 | destroy_context(cfg, ctxi); |
888baf06 MO |
843 | } |
844 | ||
65be2c79 MO |
845 | /** |
846 | * _cxlflash_disk_detach() - detaches a LUN from a context | |
847 | * @sdev: SCSI device associated with LUN. | |
848 | * @ctxi: Context owning resources. | |
849 | * @detach: Detach ioctl data structure. | |
850 | * | |
851 | * As part of the detach, all per-context resources associated with the LUN | |
852 | * are cleaned up. When detaching the last LUN for a context, the context | |
853 | * itself is cleaned up and released. | |
854 | * | |
855 | * Return: 0 on success, -errno on failure | |
856 | */ | |
857 | static int _cxlflash_disk_detach(struct scsi_device *sdev, | |
858 | struct ctx_info *ctxi, | |
859 | struct dk_cxlflash_detach *detach) | |
860 | { | |
861 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata; | |
862 | struct device *dev = &cfg->dev->dev; | |
863 | struct llun_info *lli = sdev->hostdata; | |
864 | struct lun_access *lun_access, *t; | |
865 | struct dk_cxlflash_release rel; | |
866 | bool put_ctx = false; | |
867 | ||
868 | int i; | |
869 | int rc = 0; | |
65be2c79 MO |
870 | u64 ctxid = DECODE_CTXID(detach->context_id), |
871 | rctxid = detach->context_id; | |
872 | ||
873 | dev_dbg(dev, "%s: ctxid=%llu\n", __func__, ctxid); | |
874 | ||
875 | if (!ctxi) { | |
876 | ctxi = get_context(cfg, rctxid, lli, CTX_CTRL_ERR_FALLBACK); | |
877 | if (unlikely(!ctxi)) { | |
878 | dev_dbg(dev, "%s: Bad context! (%llu)\n", | |
879 | __func__, ctxid); | |
880 | rc = -EINVAL; | |
881 | goto out; | |
882 | } | |
883 | ||
884 | put_ctx = true; | |
885 | } | |
886 | ||
887 | /* Cleanup outstanding resources tied to this LUN */ | |
888 | if (ctxi->rht_out) { | |
889 | marshal_det_to_rele(detach, &rel); | |
890 | for (i = 0; i < MAX_RHT_PER_CONTEXT; i++) { | |
891 | if (ctxi->rht_lun[i] == lli) { | |
892 | rel.rsrc_handle = i; | |
893 | _cxlflash_disk_release(sdev, ctxi, &rel); | |
894 | } | |
895 | ||
896 | /* No need to loop further if we're done */ | |
897 | if (ctxi->rht_out == 0) | |
898 | break; | |
899 | } | |
900 | } | |
901 | ||
902 | /* Take our LUN out of context, free the node */ | |
903 | list_for_each_entry_safe(lun_access, t, &ctxi->luns, list) | |
904 | if (lun_access->lli == lli) { | |
905 | list_del(&lun_access->list); | |
906 | kfree(lun_access); | |
907 | lun_access = NULL; | |
908 | break; | |
909 | } | |
910 | ||
888baf06 MO |
911 | /* |
912 | * Release the context reference and the sdev reference that | |
913 | * bound this LUN to the context. | |
914 | */ | |
c4a11827 MO |
915 | if (kref_put(&ctxi->kref, remove_context)) |
916 | put_ctx = false; | |
22fe1ae8 | 917 | scsi_device_put(sdev); |
65be2c79 MO |
918 | out: |
919 | if (put_ctx) | |
920 | put_context(ctxi); | |
921 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); | |
922 | return rc; | |
923 | } | |
924 | ||
925 | static int cxlflash_disk_detach(struct scsi_device *sdev, | |
926 | struct dk_cxlflash_detach *detach) | |
927 | { | |
928 | return _cxlflash_disk_detach(sdev, NULL, detach); | |
929 | } | |
930 | ||
931 | /** | |
932 | * cxlflash_cxl_release() - release handler for adapter file descriptor | |
933 | * @inode: File-system inode associated with fd. | |
934 | * @file: File installed with adapter file descriptor. | |
935 | * | |
936 | * This routine is the release handler for the fops registered with | |
937 | * the CXL services on an initial attach for a context. It is called | |
cd34af40 MO |
938 | * when a close (explicity by the user or as part of a process tear |
939 | * down) is performed on the adapter file descriptor returned to the | |
940 | * user. The user should be aware that explicitly performing a close | |
941 | * considered catastrophic and subsequent usage of the superpipe API | |
942 | * with previously saved off tokens will fail. | |
65be2c79 | 943 | * |
cd34af40 MO |
944 | * This routine derives the context reference and calls detach for |
945 | * each LUN associated with the context.The final detach operation | |
946 | * causes the context itself to be freed. With exception to when the | |
947 | * CXL process element (context id) lookup fails (a case that should | |
948 | * theoretically never occur), every call into this routine results | |
949 | * in a complete freeing of a context. | |
65be2c79 MO |
950 | * |
951 | * Return: 0 on success | |
952 | */ | |
953 | static int cxlflash_cxl_release(struct inode *inode, struct file *file) | |
954 | { | |
955 | struct cxl_context *ctx = cxl_fops_get_context(file); | |
956 | struct cxlflash_cfg *cfg = container_of(file->f_op, struct cxlflash_cfg, | |
957 | cxl_fops); | |
958 | struct device *dev = &cfg->dev->dev; | |
959 | struct ctx_info *ctxi = NULL; | |
960 | struct dk_cxlflash_detach detach = { { 0 }, 0 }; | |
961 | struct lun_access *lun_access, *t; | |
962 | enum ctx_ctrl ctrl = CTX_CTRL_ERR_FALLBACK | CTX_CTRL_FILE; | |
963 | int ctxid; | |
964 | ||
965 | ctxid = cxl_process_element(ctx); | |
966 | if (unlikely(ctxid < 0)) { | |
967 | dev_err(dev, "%s: Context %p was closed! (%d)\n", | |
968 | __func__, ctx, ctxid); | |
969 | goto out; | |
970 | } | |
971 | ||
972 | ctxi = get_context(cfg, ctxid, file, ctrl); | |
973 | if (unlikely(!ctxi)) { | |
974 | ctxi = get_context(cfg, ctxid, file, ctrl | CTX_CTRL_CLONE); | |
975 | if (!ctxi) { | |
976 | dev_dbg(dev, "%s: Context %d already free!\n", | |
977 | __func__, ctxid); | |
978 | goto out_release; | |
979 | } | |
980 | ||
981 | dev_dbg(dev, "%s: Another process owns context %d!\n", | |
982 | __func__, ctxid); | |
983 | put_context(ctxi); | |
984 | goto out; | |
985 | } | |
986 | ||
cd34af40 | 987 | dev_dbg(dev, "%s: close for context %d\n", __func__, ctxid); |
65be2c79 | 988 | |
65be2c79 MO |
989 | detach.context_id = ctxi->ctxid; |
990 | list_for_each_entry_safe(lun_access, t, &ctxi->luns, list) | |
991 | _cxlflash_disk_detach(lun_access->sdev, ctxi, &detach); | |
992 | out_release: | |
993 | cxl_fd_release(inode, file); | |
994 | out: | |
995 | dev_dbg(dev, "%s: returning\n", __func__); | |
996 | return 0; | |
997 | } | |
998 | ||
999 | /** | |
1000 | * unmap_context() - clears a previously established mapping | |
1001 | * @ctxi: Context owning the mapping. | |
1002 | * | |
1003 | * This routine is used to switch between the error notification page | |
1004 | * (dummy page of all 1's) and the real mapping (established by the CXL | |
1005 | * fault handler). | |
1006 | */ | |
1007 | static void unmap_context(struct ctx_info *ctxi) | |
1008 | { | |
1009 | unmap_mapping_range(ctxi->file->f_mapping, 0, 0, 1); | |
1010 | } | |
1011 | ||
1012 | /** | |
1013 | * get_err_page() - obtains and allocates the error notification page | |
1014 | * | |
1015 | * Return: error notification page on success, NULL on failure | |
1016 | */ | |
1017 | static struct page *get_err_page(void) | |
1018 | { | |
1019 | struct page *err_page = global.err_page; | |
1020 | ||
1021 | if (unlikely(!err_page)) { | |
1022 | err_page = alloc_page(GFP_KERNEL); | |
1023 | if (unlikely(!err_page)) { | |
1024 | pr_err("%s: Unable to allocate err_page!\n", __func__); | |
1025 | goto out; | |
1026 | } | |
1027 | ||
1028 | memset(page_address(err_page), -1, PAGE_SIZE); | |
1029 | ||
1030 | /* Serialize update w/ other threads to avoid a leak */ | |
1031 | mutex_lock(&global.mutex); | |
1032 | if (likely(!global.err_page)) | |
1033 | global.err_page = err_page; | |
1034 | else { | |
1035 | __free_page(err_page); | |
1036 | err_page = global.err_page; | |
1037 | } | |
1038 | mutex_unlock(&global.mutex); | |
1039 | } | |
1040 | ||
1041 | out: | |
1042 | pr_debug("%s: returning err_page=%p\n", __func__, err_page); | |
1043 | return err_page; | |
1044 | } | |
1045 | ||
1046 | /** | |
1047 | * cxlflash_mmap_fault() - mmap fault handler for adapter file descriptor | |
1048 | * @vma: VM area associated with mapping. | |
1049 | * @vmf: VM fault associated with current fault. | |
1050 | * | |
1051 | * To support error notification via MMIO, faults are 'caught' by this routine | |
1052 | * that was inserted before passing back the adapter file descriptor on attach. | |
1053 | * When a fault occurs, this routine evaluates if error recovery is active and | |
1054 | * if so, installs the error page to 'notify' the user about the error state. | |
1055 | * During normal operation, the fault is simply handled by the original fault | |
1056 | * handler that was installed by CXL services as part of initializing the | |
1057 | * adapter file descriptor. The VMA's page protection bits are toggled to | |
1058 | * indicate cached/not-cached depending on the memory backing the fault. | |
1059 | * | |
1060 | * Return: 0 on success, VM_FAULT_SIGBUS on failure | |
1061 | */ | |
1062 | static int cxlflash_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
1063 | { | |
1064 | struct file *file = vma->vm_file; | |
1065 | struct cxl_context *ctx = cxl_fops_get_context(file); | |
1066 | struct cxlflash_cfg *cfg = container_of(file->f_op, struct cxlflash_cfg, | |
1067 | cxl_fops); | |
1068 | struct device *dev = &cfg->dev->dev; | |
1069 | struct ctx_info *ctxi = NULL; | |
1070 | struct page *err_page = NULL; | |
1071 | enum ctx_ctrl ctrl = CTX_CTRL_ERR_FALLBACK | CTX_CTRL_FILE; | |
1072 | int rc = 0; | |
1073 | int ctxid; | |
1074 | ||
1075 | ctxid = cxl_process_element(ctx); | |
1076 | if (unlikely(ctxid < 0)) { | |
1077 | dev_err(dev, "%s: Context %p was closed! (%d)\n", | |
1078 | __func__, ctx, ctxid); | |
1079 | goto err; | |
1080 | } | |
1081 | ||
1082 | ctxi = get_context(cfg, ctxid, file, ctrl); | |
1083 | if (unlikely(!ctxi)) { | |
1084 | dev_dbg(dev, "%s: Bad context! (%d)\n", __func__, ctxid); | |
1085 | goto err; | |
1086 | } | |
1087 | ||
de9f0b0c | 1088 | dev_dbg(dev, "%s: fault for context %d\n", __func__, ctxid); |
65be2c79 MO |
1089 | |
1090 | if (likely(!ctxi->err_recovery_active)) { | |
1091 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
1092 | rc = ctxi->cxl_mmap_vmops->fault(vma, vmf); | |
1093 | } else { | |
1094 | dev_dbg(dev, "%s: err recovery active, use err_page!\n", | |
1095 | __func__); | |
1096 | ||
1097 | err_page = get_err_page(); | |
1098 | if (unlikely(!err_page)) { | |
1099 | dev_err(dev, "%s: Could not obtain error page!\n", | |
1100 | __func__); | |
1101 | rc = VM_FAULT_RETRY; | |
1102 | goto out; | |
1103 | } | |
1104 | ||
1105 | get_page(err_page); | |
1106 | vmf->page = err_page; | |
1107 | vma->vm_page_prot = pgprot_cached(vma->vm_page_prot); | |
1108 | } | |
1109 | ||
1110 | out: | |
1111 | if (likely(ctxi)) | |
1112 | put_context(ctxi); | |
1113 | dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); | |
1114 | return rc; | |
1115 | ||
1116 | err: | |
1117 | rc = VM_FAULT_SIGBUS; | |
1118 | goto out; | |
1119 | } | |
1120 | ||
1121 | /* | |
1122 | * Local MMAP vmops to 'catch' faults | |
1123 | */ | |
1124 | static const struct vm_operations_struct cxlflash_mmap_vmops = { | |
1125 | .fault = cxlflash_mmap_fault, | |
1126 | }; | |
1127 | ||
1128 | /** | |
1129 | * cxlflash_cxl_mmap() - mmap handler for adapter file descriptor | |
1130 | * @file: File installed with adapter file descriptor. | |
1131 | * @vma: VM area associated with mapping. | |
1132 | * | |
1133 | * Installs local mmap vmops to 'catch' faults for error notification support. | |
1134 | * | |
1135 | * Return: 0 on success, -errno on failure | |
1136 | */ | |
1137 | static int cxlflash_cxl_mmap(struct file *file, struct vm_area_struct *vma) | |
1138 | { | |
1139 | struct cxl_context *ctx = cxl_fops_get_context(file); | |
1140 | struct cxlflash_cfg *cfg = container_of(file->f_op, struct cxlflash_cfg, | |
1141 | cxl_fops); | |
1142 | struct device *dev = &cfg->dev->dev; | |
1143 | struct ctx_info *ctxi = NULL; | |
1144 | enum ctx_ctrl ctrl = CTX_CTRL_ERR_FALLBACK | CTX_CTRL_FILE; | |
1145 | int ctxid; | |
1146 | int rc = 0; | |
1147 | ||
1148 | ctxid = cxl_process_element(ctx); | |
1149 | if (unlikely(ctxid < 0)) { | |
1150 | dev_err(dev, "%s: Context %p was closed! (%d)\n", | |
1151 | __func__, ctx, ctxid); | |
1152 | rc = -EIO; | |
1153 | goto out; | |
1154 | } | |
1155 | ||
1156 | ctxi = get_context(cfg, ctxid, file, ctrl); | |
1157 | if (unlikely(!ctxi)) { | |
1158 | dev_dbg(dev, "%s: Bad context! (%d)\n", __func__, ctxid); | |
1159 | rc = -EIO; | |
1160 | goto out; | |
1161 | } | |
1162 | ||
de9f0b0c | 1163 | dev_dbg(dev, "%s: mmap for context %d\n", __func__, ctxid); |
65be2c79 MO |
1164 | |
1165 | rc = cxl_fd_mmap(file, vma); | |
1166 | if (likely(!rc)) { | |
1167 | /* Insert ourself in the mmap fault handler path */ | |
1168 | ctxi->cxl_mmap_vmops = vma->vm_ops; | |
1169 | vma->vm_ops = &cxlflash_mmap_vmops; | |
1170 | } | |
1171 | ||
1172 | out: | |
1173 | if (likely(ctxi)) | |
1174 | put_context(ctxi); | |
1175 | return rc; | |
1176 | } | |
1177 | ||
17ead26f | 1178 | const struct file_operations cxlflash_cxl_fops = { |
65be2c79 MO |
1179 | .owner = THIS_MODULE, |
1180 | .mmap = cxlflash_cxl_mmap, | |
1181 | .release = cxlflash_cxl_release, | |
1182 | }; | |
1183 | ||
1184 | /** | |
1185 | * cxlflash_mark_contexts_error() - move contexts to error state and list | |
1186 | * @cfg: Internal structure associated with the host. | |
1187 | * | |
1188 | * A context is only moved over to the error list when there are no outstanding | |
1189 | * references to it. This ensures that a running operation has completed. | |
1190 | * | |
1191 | * Return: 0 on success, -errno on failure | |
1192 | */ | |
1193 | int cxlflash_mark_contexts_error(struct cxlflash_cfg *cfg) | |
1194 | { | |
1195 | int i, rc = 0; | |
1196 | struct ctx_info *ctxi = NULL; | |
1197 | ||
1198 | mutex_lock(&cfg->ctx_tbl_list_mutex); | |
1199 | ||
1200 | for (i = 0; i < MAX_CONTEXT; i++) { | |
1201 | ctxi = cfg->ctx_tbl[i]; | |
1202 | if (ctxi) { | |
1203 | mutex_lock(&ctxi->mutex); | |
1204 | cfg->ctx_tbl[i] = NULL; | |
1205 | list_add(&ctxi->list, &cfg->ctx_err_recovery); | |
1206 | ctxi->err_recovery_active = true; | |
1207 | ctxi->ctrl_map = NULL; | |
1208 | unmap_context(ctxi); | |
1209 | mutex_unlock(&ctxi->mutex); | |
1210 | } | |
1211 | } | |
1212 | ||
1213 | mutex_unlock(&cfg->ctx_tbl_list_mutex); | |
1214 | return rc; | |
1215 | } | |
1216 | ||
1217 | /* | |
1218 | * Dummy NULL fops | |
1219 | */ | |
1220 | static const struct file_operations null_fops = { | |
1221 | .owner = THIS_MODULE, | |
1222 | }; | |
1223 | ||
0a27ae51 MO |
1224 | /** |
1225 | * check_state() - checks and responds to the current adapter state | |
1226 | * @cfg: Internal structure associated with the host. | |
1227 | * | |
1228 | * This routine can block and should only be used on process context. | |
1229 | * It assumes that the caller is an ioctl thread and holding the ioctl | |
1230 | * read semaphore. This is temporarily let up across the wait to allow | |
1231 | * for draining actively running ioctls. Also note that when waking up | |
1232 | * from waiting in reset, the state is unknown and must be checked again | |
1233 | * before proceeding. | |
1234 | * | |
1235 | * Return: 0 on success, -errno on failure | |
1236 | */ | |
aacb4ff6 | 1237 | int check_state(struct cxlflash_cfg *cfg) |
0a27ae51 MO |
1238 | { |
1239 | struct device *dev = &cfg->dev->dev; | |
1240 | int rc = 0; | |
1241 | ||
1242 | retry: | |
1243 | switch (cfg->state) { | |
439e85c1 MO |
1244 | case STATE_RESET: |
1245 | dev_dbg(dev, "%s: Reset state, going to wait...\n", __func__); | |
0a27ae51 | 1246 | up_read(&cfg->ioctl_rwsem); |
439e85c1 MO |
1247 | rc = wait_event_interruptible(cfg->reset_waitq, |
1248 | cfg->state != STATE_RESET); | |
0a27ae51 MO |
1249 | down_read(&cfg->ioctl_rwsem); |
1250 | if (unlikely(rc)) | |
1251 | break; | |
1252 | goto retry; | |
1253 | case STATE_FAILTERM: | |
1254 | dev_dbg(dev, "%s: Failed/Terminating!\n", __func__); | |
1255 | rc = -ENODEV; | |
1256 | break; | |
1257 | default: | |
1258 | break; | |
1259 | } | |
1260 | ||
1261 | return rc; | |
1262 | } | |
1263 | ||
65be2c79 MO |
1264 | /** |
1265 | * cxlflash_disk_attach() - attach a LUN to a context | |
1266 | * @sdev: SCSI device associated with LUN. | |
1267 | * @attach: Attach ioctl data structure. | |
1268 | * | |
1269 | * Creates a context and attaches LUN to it. A LUN can only be attached | |
1270 | * one time to a context (subsequent attaches for the same context/LUN pair | |
1271 | * are not supported). Additional LUNs can be attached to a context by | |
1272 | * specifying the 'reuse' flag defined in the cxlflash_ioctl.h header. | |
1273 | * | |
1274 | * Return: 0 on success, -errno on failure | |
1275 | */ | |
1276 | static int cxlflash_disk_attach(struct scsi_device *sdev, | |
1277 | struct dk_cxlflash_attach *attach) | |
1278 | { | |
1279 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata; | |
1280 | struct device *dev = &cfg->dev->dev; | |
1281 | struct afu *afu = cfg->afu; | |
1282 | struct llun_info *lli = sdev->hostdata; | |
1283 | struct glun_info *gli = lli->parent; | |
1284 | struct cxl_ioctl_start_work *work; | |
1285 | struct ctx_info *ctxi = NULL; | |
1286 | struct lun_access *lun_access = NULL; | |
1287 | int rc = 0; | |
1288 | u32 perms; | |
1289 | int ctxid = -1; | |
bae0ac69 | 1290 | u64 flags = 0UL; |
65be2c79 | 1291 | u64 rctxid = 0UL; |
8a96b52a | 1292 | struct file *file = NULL; |
65be2c79 | 1293 | |
8a96b52a | 1294 | struct cxl_context *ctx = NULL; |
65be2c79 MO |
1295 | |
1296 | int fd = -1; | |
1297 | ||
65be2c79 MO |
1298 | if (attach->num_interrupts > 4) { |
1299 | dev_dbg(dev, "%s: Cannot support this many interrupts %llu\n", | |
1300 | __func__, attach->num_interrupts); | |
1301 | rc = -EINVAL; | |
1302 | goto out; | |
1303 | } | |
1304 | ||
1305 | if (gli->max_lba == 0) { | |
1306 | dev_dbg(dev, "%s: No capacity info for this LUN (%016llX)\n", | |
1307 | __func__, lli->lun_id[sdev->channel]); | |
1308 | rc = read_cap16(sdev, lli); | |
1309 | if (rc) { | |
1310 | dev_err(dev, "%s: Invalid device! (%d)\n", | |
1311 | __func__, rc); | |
1312 | rc = -ENODEV; | |
1313 | goto out; | |
1314 | } | |
1315 | dev_dbg(dev, "%s: LBA = %016llX\n", __func__, gli->max_lba); | |
1316 | dev_dbg(dev, "%s: BLK_LEN = %08X\n", __func__, gli->blk_len); | |
1317 | } | |
1318 | ||
1319 | if (attach->hdr.flags & DK_CXLFLASH_ATTACH_REUSE_CONTEXT) { | |
1320 | rctxid = attach->context_id; | |
1321 | ctxi = get_context(cfg, rctxid, NULL, 0); | |
1322 | if (!ctxi) { | |
1323 | dev_dbg(dev, "%s: Bad context! (%016llX)\n", | |
1324 | __func__, rctxid); | |
1325 | rc = -EINVAL; | |
1326 | goto out; | |
1327 | } | |
1328 | ||
1329 | list_for_each_entry(lun_access, &ctxi->luns, list) | |
1330 | if (lun_access->lli == lli) { | |
1331 | dev_dbg(dev, "%s: Already attached!\n", | |
1332 | __func__); | |
1333 | rc = -EINVAL; | |
1334 | goto out; | |
1335 | } | |
1336 | } | |
1337 | ||
22fe1ae8 MO |
1338 | rc = scsi_device_get(sdev); |
1339 | if (unlikely(rc)) { | |
1340 | dev_err(dev, "%s: Unable to get sdev reference!\n", __func__); | |
1341 | goto out; | |
1342 | } | |
1343 | ||
65be2c79 MO |
1344 | lun_access = kzalloc(sizeof(*lun_access), GFP_KERNEL); |
1345 | if (unlikely(!lun_access)) { | |
1346 | dev_err(dev, "%s: Unable to allocate lun_access!\n", __func__); | |
1347 | rc = -ENOMEM; | |
8a96b52a | 1348 | goto err; |
65be2c79 MO |
1349 | } |
1350 | ||
1351 | lun_access->lli = lli; | |
1352 | lun_access->sdev = sdev; | |
1353 | ||
888baf06 | 1354 | /* Non-NULL context indicates reuse (another context reference) */ |
65be2c79 MO |
1355 | if (ctxi) { |
1356 | dev_dbg(dev, "%s: Reusing context for LUN! (%016llX)\n", | |
1357 | __func__, rctxid); | |
888baf06 | 1358 | kref_get(&ctxi->kref); |
65be2c79 | 1359 | list_add(&lun_access->list, &ctxi->luns); |
65be2c79 MO |
1360 | goto out_attach; |
1361 | } | |
1362 | ||
5d1952ac UK |
1363 | ctxi = create_context(cfg); |
1364 | if (unlikely(!ctxi)) { | |
1365 | dev_err(dev, "%s: Failed to create context! (%d)\n", | |
1366 | __func__, ctxid); | |
1367 | goto err; | |
1368 | } | |
1369 | ||
65be2c79 | 1370 | ctx = cxl_dev_context_init(cfg->dev); |
21891a45 | 1371 | if (IS_ERR_OR_NULL(ctx)) { |
65be2c79 MO |
1372 | dev_err(dev, "%s: Could not initialize context %p\n", |
1373 | __func__, ctx); | |
1374 | rc = -ENODEV; | |
8a96b52a | 1375 | goto err; |
65be2c79 MO |
1376 | } |
1377 | ||
5d1952ac UK |
1378 | work = &ctxi->work; |
1379 | work->num_interrupts = attach->num_interrupts; | |
1380 | work->flags = CXL_START_WORK_NUM_IRQS; | |
1381 | ||
1382 | rc = cxl_start_work(ctx, work); | |
1383 | if (unlikely(rc)) { | |
1384 | dev_dbg(dev, "%s: Could not start context rc=%d\n", | |
1385 | __func__, rc); | |
1386 | goto err; | |
1387 | } | |
1388 | ||
65be2c79 | 1389 | ctxid = cxl_process_element(ctx); |
e37390be | 1390 | if (unlikely((ctxid >= MAX_CONTEXT) || (ctxid < 0))) { |
65be2c79 MO |
1391 | dev_err(dev, "%s: ctxid (%d) invalid!\n", __func__, ctxid); |
1392 | rc = -EPERM; | |
8a96b52a | 1393 | goto err; |
65be2c79 MO |
1394 | } |
1395 | ||
1396 | file = cxl_get_fd(ctx, &cfg->cxl_fops, &fd); | |
1397 | if (unlikely(fd < 0)) { | |
1398 | rc = -ENODEV; | |
1399 | dev_err(dev, "%s: Could not get file descriptor\n", __func__); | |
8a96b52a | 1400 | goto err; |
65be2c79 MO |
1401 | } |
1402 | ||
1403 | /* Translate read/write O_* flags from fcntl.h to AFU permission bits */ | |
1404 | perms = SISL_RHT_PERM(attach->hdr.flags + 1); | |
1405 | ||
5e6632d1 | 1406 | /* Context mutex is locked upon return */ |
de9f0b0c | 1407 | init_context(ctxi, cfg, ctx, ctxid, file, perms); |
5e6632d1 | 1408 | |
65be2c79 MO |
1409 | rc = afu_attach(cfg, ctxi); |
1410 | if (unlikely(rc)) { | |
1411 | dev_err(dev, "%s: Could not attach AFU rc %d\n", __func__, rc); | |
8a96b52a | 1412 | goto err; |
65be2c79 MO |
1413 | } |
1414 | ||
1415 | /* | |
1416 | * No error paths after this point. Once the fd is installed it's | |
1417 | * visible to user space and can't be undone safely on this thread. | |
1418 | * There is no need to worry about a deadlock here because no one | |
1419 | * knows about us yet; we can be the only one holding our mutex. | |
1420 | */ | |
1421 | list_add(&lun_access->list, &ctxi->luns); | |
65be2c79 MO |
1422 | mutex_lock(&cfg->ctx_tbl_list_mutex); |
1423 | mutex_lock(&ctxi->mutex); | |
1424 | cfg->ctx_tbl[ctxid] = ctxi; | |
1425 | mutex_unlock(&cfg->ctx_tbl_list_mutex); | |
1426 | fd_install(fd, file); | |
1427 | ||
1428 | out_attach: | |
cd34af40 | 1429 | if (fd != -1) |
bae0ac69 MO |
1430 | flags |= DK_CXLFLASH_APP_CLOSE_ADAP_FD; |
1431 | if (afu_is_sq_cmd_mode(afu)) | |
1432 | flags |= DK_CXLFLASH_CONTEXT_SQ_CMD_MODE; | |
cd34af40 | 1433 | |
bae0ac69 | 1434 | attach->hdr.return_flags = flags; |
65be2c79 MO |
1435 | attach->context_id = ctxi->ctxid; |
1436 | attach->block_size = gli->blk_len; | |
1437 | attach->mmio_size = sizeof(afu->afu_map->hosts[0].harea); | |
1438 | attach->last_lba = gli->max_lba; | |
471a5a60 MK |
1439 | attach->max_xfer = sdev->host->max_sectors * MAX_SECTOR_UNIT; |
1440 | attach->max_xfer /= gli->blk_len; | |
65be2c79 MO |
1441 | |
1442 | out: | |
1443 | attach->adap_fd = fd; | |
1444 | ||
1445 | if (ctxi) | |
1446 | put_context(ctxi); | |
1447 | ||
1448 | dev_dbg(dev, "%s: returning ctxid=%d fd=%d bs=%lld rc=%d llba=%lld\n", | |
1449 | __func__, ctxid, fd, attach->block_size, rc, attach->last_lba); | |
1450 | return rc; | |
1451 | ||
8a96b52a MO |
1452 | err: |
1453 | /* Cleanup CXL context; okay to 'stop' even if it was not started */ | |
1454 | if (!IS_ERR_OR_NULL(ctx)) { | |
1455 | cxl_stop_context(ctx); | |
1456 | cxl_release_context(ctx); | |
1457 | ctx = NULL; | |
1458 | } | |
1459 | ||
65be2c79 MO |
1460 | /* |
1461 | * Here, we're overriding the fops with a dummy all-NULL fops because | |
1462 | * fput() calls the release fop, which will cause us to mistakenly | |
1463 | * call into the CXL code. Rather than try to add yet more complexity | |
1464 | * to that routine (cxlflash_cxl_release) we should try to fix the | |
1465 | * issue here. | |
1466 | */ | |
8a96b52a MO |
1467 | if (fd > 0) { |
1468 | file->f_op = &null_fops; | |
1469 | fput(file); | |
1470 | put_unused_fd(fd); | |
1471 | fd = -1; | |
1472 | file = NULL; | |
1473 | } | |
1474 | ||
41b99e1a | 1475 | /* Cleanup our context */ |
8a96b52a MO |
1476 | if (ctxi) { |
1477 | destroy_context(cfg, ctxi); | |
1478 | ctxi = NULL; | |
1479 | } | |
1480 | ||
65be2c79 | 1481 | kfree(lun_access); |
22fe1ae8 | 1482 | scsi_device_put(sdev); |
65be2c79 MO |
1483 | goto out; |
1484 | } | |
1485 | ||
1486 | /** | |
1487 | * recover_context() - recovers a context in error | |
1488 | * @cfg: Internal structure associated with the host. | |
1489 | * @ctxi: Context to release. | |
de9f0b0c | 1490 | * @adap_fd: Adapter file descriptor associated with new/recovered context. |
65be2c79 MO |
1491 | * |
1492 | * Restablishes the state for a context-in-error. | |
1493 | * | |
1494 | * Return: 0 on success, -errno on failure | |
1495 | */ | |
de9f0b0c MO |
1496 | static int recover_context(struct cxlflash_cfg *cfg, |
1497 | struct ctx_info *ctxi, | |
1498 | int *adap_fd) | |
65be2c79 MO |
1499 | { |
1500 | struct device *dev = &cfg->dev->dev; | |
1501 | int rc = 0; | |
cd34af40 | 1502 | int fd = -1; |
65be2c79 MO |
1503 | int ctxid = -1; |
1504 | struct file *file; | |
1505 | struct cxl_context *ctx; | |
1506 | struct afu *afu = cfg->afu; | |
1507 | ||
1508 | ctx = cxl_dev_context_init(cfg->dev); | |
21891a45 | 1509 | if (IS_ERR_OR_NULL(ctx)) { |
65be2c79 MO |
1510 | dev_err(dev, "%s: Could not initialize context %p\n", |
1511 | __func__, ctx); | |
1512 | rc = -ENODEV; | |
1513 | goto out; | |
1514 | } | |
1515 | ||
5d1952ac UK |
1516 | rc = cxl_start_work(ctx, &ctxi->work); |
1517 | if (unlikely(rc)) { | |
1518 | dev_dbg(dev, "%s: Could not start context rc=%d\n", | |
1519 | __func__, rc); | |
1520 | goto err1; | |
1521 | } | |
1522 | ||
65be2c79 | 1523 | ctxid = cxl_process_element(ctx); |
e37390be | 1524 | if (unlikely((ctxid >= MAX_CONTEXT) || (ctxid < 0))) { |
65be2c79 MO |
1525 | dev_err(dev, "%s: ctxid (%d) invalid!\n", __func__, ctxid); |
1526 | rc = -EPERM; | |
5d1952ac | 1527 | goto err2; |
65be2c79 MO |
1528 | } |
1529 | ||
1530 | file = cxl_get_fd(ctx, &cfg->cxl_fops, &fd); | |
1531 | if (unlikely(fd < 0)) { | |
1532 | rc = -ENODEV; | |
1533 | dev_err(dev, "%s: Could not get file descriptor\n", __func__); | |
65be2c79 MO |
1534 | goto err2; |
1535 | } | |
1536 | ||
1537 | /* Update with new MMIO area based on updated context id */ | |
1538 | ctxi->ctrl_map = &afu->afu_map->ctrls[ctxid].ctrl; | |
1539 | ||
1540 | rc = afu_attach(cfg, ctxi); | |
1541 | if (rc) { | |
1542 | dev_err(dev, "%s: Could not attach AFU rc %d\n", __func__, rc); | |
1543 | goto err3; | |
1544 | } | |
1545 | ||
1546 | /* | |
1547 | * No error paths after this point. Once the fd is installed it's | |
1548 | * visible to user space and can't be undone safely on this thread. | |
1549 | */ | |
65be2c79 | 1550 | ctxi->ctxid = ENCODE_CTXID(ctxi, ctxid); |
65be2c79 MO |
1551 | ctxi->ctx = ctx; |
1552 | ctxi->file = file; | |
1553 | ||
1554 | /* | |
1555 | * Put context back in table (note the reinit of the context list); | |
1556 | * we must first drop the context's mutex and then acquire it in | |
1557 | * order with the table/list mutex to avoid a deadlock - safe to do | |
1558 | * here because no one can find us at this moment in time. | |
1559 | */ | |
1560 | mutex_unlock(&ctxi->mutex); | |
1561 | mutex_lock(&cfg->ctx_tbl_list_mutex); | |
1562 | mutex_lock(&ctxi->mutex); | |
1563 | list_del_init(&ctxi->list); | |
1564 | cfg->ctx_tbl[ctxid] = ctxi; | |
1565 | mutex_unlock(&cfg->ctx_tbl_list_mutex); | |
1566 | fd_install(fd, file); | |
de9f0b0c | 1567 | *adap_fd = fd; |
65be2c79 MO |
1568 | out: |
1569 | dev_dbg(dev, "%s: returning ctxid=%d fd=%d rc=%d\n", | |
1570 | __func__, ctxid, fd, rc); | |
1571 | return rc; | |
1572 | ||
1573 | err3: | |
65be2c79 MO |
1574 | fput(file); |
1575 | put_unused_fd(fd); | |
5d1952ac UK |
1576 | err2: |
1577 | cxl_stop_context(ctx); | |
65be2c79 MO |
1578 | err1: |
1579 | cxl_release_context(ctx); | |
1580 | goto out; | |
1581 | } | |
1582 | ||
65be2c79 MO |
1583 | /** |
1584 | * cxlflash_afu_recover() - initiates AFU recovery | |
1585 | * @sdev: SCSI device associated with LUN. | |
1586 | * @recover: Recover ioctl data structure. | |
1587 | * | |
1588 | * Only a single recovery is allowed at a time to avoid exhausting CXL | |
1589 | * resources (leading to recovery failure) in the event that we're up | |
1590 | * against the maximum number of contexts limit. For similar reasons, | |
1591 | * a context recovery is retried if there are multiple recoveries taking | |
1592 | * place at the same time and the failure was due to CXL services being | |
1593 | * unable to keep up. | |
1594 | * | |
635f6b08 MK |
1595 | * As this routine is called on ioctl context, it holds the ioctl r/w |
1596 | * semaphore that is used to drain ioctls in recovery scenarios. The | |
1597 | * implementation to achieve the pacing described above (a local mutex) | |
1598 | * requires that the ioctl r/w semaphore be dropped and reacquired to | |
1599 | * avoid a 3-way deadlock when multiple process recoveries operate in | |
1600 | * parallel. | |
1601 | * | |
65be2c79 MO |
1602 | * Because a user can detect an error condition before the kernel, it is |
1603 | * quite possible for this routine to act as the kernel's EEH detection | |
1604 | * source (MMIO read of mbox_r). Because of this, there is a window of | |
1605 | * time where an EEH might have been detected but not yet 'serviced' | |
439e85c1 | 1606 | * (callback invoked, causing the device to enter reset state). To avoid |
65be2c79 MO |
1607 | * looping in this routine during that window, a 1 second sleep is in place |
1608 | * between the time the MMIO failure is detected and the time a wait on the | |
439e85c1 | 1609 | * reset wait queue is attempted via check_state(). |
65be2c79 MO |
1610 | * |
1611 | * Return: 0 on success, -errno on failure | |
1612 | */ | |
1613 | static int cxlflash_afu_recover(struct scsi_device *sdev, | |
1614 | struct dk_cxlflash_recover_afu *recover) | |
1615 | { | |
1616 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata; | |
1617 | struct device *dev = &cfg->dev->dev; | |
1618 | struct llun_info *lli = sdev->hostdata; | |
1619 | struct afu *afu = cfg->afu; | |
1620 | struct ctx_info *ctxi = NULL; | |
1621 | struct mutex *mutex = &cfg->ctx_recovery_mutex; | |
bae0ac69 | 1622 | u64 flags; |
65be2c79 MO |
1623 | u64 ctxid = DECODE_CTXID(recover->context_id), |
1624 | rctxid = recover->context_id; | |
1625 | long reg; | |
1626 | int lretry = 20; /* up to 2 seconds */ | |
de9f0b0c | 1627 | int new_adap_fd = -1; |
65be2c79 MO |
1628 | int rc = 0; |
1629 | ||
1630 | atomic_inc(&cfg->recovery_threads); | |
635f6b08 | 1631 | up_read(&cfg->ioctl_rwsem); |
65be2c79 | 1632 | rc = mutex_lock_interruptible(mutex); |
635f6b08 | 1633 | down_read(&cfg->ioctl_rwsem); |
65be2c79 MO |
1634 | if (rc) |
1635 | goto out; | |
635f6b08 MK |
1636 | rc = check_state(cfg); |
1637 | if (rc) { | |
1638 | dev_err(dev, "%s: Failed state! rc=%d\n", __func__, rc); | |
1639 | rc = -ENODEV; | |
1640 | goto out; | |
1641 | } | |
65be2c79 MO |
1642 | |
1643 | dev_dbg(dev, "%s: reason 0x%016llX rctxid=%016llX\n", | |
1644 | __func__, recover->reason, rctxid); | |
1645 | ||
1646 | retry: | |
1647 | /* Ensure that this process is attached to the context */ | |
1648 | ctxi = get_context(cfg, rctxid, lli, CTX_CTRL_ERR_FALLBACK); | |
1649 | if (unlikely(!ctxi)) { | |
1650 | dev_dbg(dev, "%s: Bad context! (%llu)\n", __func__, ctxid); | |
1651 | rc = -EINVAL; | |
1652 | goto out; | |
1653 | } | |
1654 | ||
1655 | if (ctxi->err_recovery_active) { | |
1656 | retry_recover: | |
de9f0b0c | 1657 | rc = recover_context(cfg, ctxi, &new_adap_fd); |
65be2c79 MO |
1658 | if (unlikely(rc)) { |
1659 | dev_err(dev, "%s: Recovery failed for context %llu (rc=%d)\n", | |
1660 | __func__, ctxid, rc); | |
1661 | if ((rc == -ENODEV) && | |
1662 | ((atomic_read(&cfg->recovery_threads) > 1) || | |
1663 | (lretry--))) { | |
1664 | dev_dbg(dev, "%s: Going to try again!\n", | |
1665 | __func__); | |
1666 | mutex_unlock(mutex); | |
1667 | msleep(100); | |
1668 | rc = mutex_lock_interruptible(mutex); | |
1669 | if (rc) | |
1670 | goto out; | |
1671 | goto retry_recover; | |
1672 | } | |
1673 | ||
1674 | goto out; | |
1675 | } | |
1676 | ||
1677 | ctxi->err_recovery_active = false; | |
bae0ac69 MO |
1678 | |
1679 | flags = DK_CXLFLASH_APP_CLOSE_ADAP_FD | | |
1680 | DK_CXLFLASH_RECOVER_AFU_CONTEXT_RESET; | |
1681 | if (afu_is_sq_cmd_mode(afu)) | |
1682 | flags |= DK_CXLFLASH_CONTEXT_SQ_CMD_MODE; | |
1683 | ||
1684 | recover->hdr.return_flags = flags; | |
65be2c79 | 1685 | recover->context_id = ctxi->ctxid; |
de9f0b0c | 1686 | recover->adap_fd = new_adap_fd; |
65be2c79 | 1687 | recover->mmio_size = sizeof(afu->afu_map->hosts[0].harea); |
65be2c79 MO |
1688 | goto out; |
1689 | } | |
1690 | ||
1691 | /* Test if in error state */ | |
1692 | reg = readq_be(&afu->ctrl_map->mbox_r); | |
1693 | if (reg == -1) { | |
0a27ae51 MO |
1694 | dev_dbg(dev, "%s: MMIO fail, wait for recovery.\n", __func__); |
1695 | ||
1696 | /* | |
1697 | * Before checking the state, put back the context obtained with | |
1698 | * get_context() as it is no longer needed and sleep for a short | |
1699 | * period of time (see prolog notes). | |
1700 | */ | |
1701 | put_context(ctxi); | |
65be2c79 MO |
1702 | ctxi = NULL; |
1703 | ssleep(1); | |
1704 | rc = check_state(cfg); | |
1705 | if (unlikely(rc)) | |
1706 | goto out; | |
1707 | goto retry; | |
1708 | } | |
1709 | ||
1710 | dev_dbg(dev, "%s: MMIO working, no recovery required!\n", __func__); | |
1711 | out: | |
1712 | if (likely(ctxi)) | |
1713 | put_context(ctxi); | |
1714 | mutex_unlock(mutex); | |
1715 | atomic_dec_if_positive(&cfg->recovery_threads); | |
1716 | return rc; | |
1717 | } | |
1718 | ||
1719 | /** | |
1720 | * process_sense() - evaluates and processes sense data | |
1721 | * @sdev: SCSI device associated with LUN. | |
1722 | * @verify: Verify ioctl data structure. | |
1723 | * | |
1724 | * Return: 0 on success, -errno on failure | |
1725 | */ | |
1726 | static int process_sense(struct scsi_device *sdev, | |
1727 | struct dk_cxlflash_verify *verify) | |
1728 | { | |
1729 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata; | |
1730 | struct device *dev = &cfg->dev->dev; | |
1731 | struct llun_info *lli = sdev->hostdata; | |
1732 | struct glun_info *gli = lli->parent; | |
1733 | u64 prev_lba = gli->max_lba; | |
1734 | struct scsi_sense_hdr sshdr = { 0 }; | |
1735 | int rc = 0; | |
1736 | ||
1737 | rc = scsi_normalize_sense((const u8 *)&verify->sense_data, | |
1738 | DK_CXLFLASH_VERIFY_SENSE_LEN, &sshdr); | |
1739 | if (!rc) { | |
1740 | dev_err(dev, "%s: Failed to normalize sense data!\n", __func__); | |
1741 | rc = -EINVAL; | |
1742 | goto out; | |
1743 | } | |
1744 | ||
1745 | switch (sshdr.sense_key) { | |
1746 | case NO_SENSE: | |
1747 | case RECOVERED_ERROR: | |
1748 | /* fall through */ | |
1749 | case NOT_READY: | |
1750 | break; | |
1751 | case UNIT_ATTENTION: | |
1752 | switch (sshdr.asc) { | |
1753 | case 0x29: /* Power on Reset or Device Reset */ | |
1754 | /* fall through */ | |
1755 | case 0x2A: /* Device settings/capacity changed */ | |
1756 | rc = read_cap16(sdev, lli); | |
1757 | if (rc) { | |
1758 | rc = -ENODEV; | |
1759 | break; | |
1760 | } | |
1761 | if (prev_lba != gli->max_lba) | |
1762 | dev_dbg(dev, "%s: Capacity changed old=%lld " | |
1763 | "new=%lld\n", __func__, prev_lba, | |
1764 | gli->max_lba); | |
1765 | break; | |
1766 | case 0x3F: /* Report LUNs changed, Rescan. */ | |
1767 | scsi_scan_host(cfg->host); | |
1768 | break; | |
1769 | default: | |
1770 | rc = -EIO; | |
1771 | break; | |
1772 | } | |
1773 | break; | |
1774 | default: | |
1775 | rc = -EIO; | |
1776 | break; | |
1777 | } | |
1778 | out: | |
1779 | dev_dbg(dev, "%s: sense_key %x asc %x ascq %x rc %d\n", __func__, | |
1780 | sshdr.sense_key, sshdr.asc, sshdr.ascq, rc); | |
1781 | return rc; | |
1782 | } | |
1783 | ||
1784 | /** | |
1785 | * cxlflash_disk_verify() - verifies a LUN is the same and handle size changes | |
1786 | * @sdev: SCSI device associated with LUN. | |
1787 | * @verify: Verify ioctl data structure. | |
1788 | * | |
1789 | * Return: 0 on success, -errno on failure | |
1790 | */ | |
1791 | static int cxlflash_disk_verify(struct scsi_device *sdev, | |
1792 | struct dk_cxlflash_verify *verify) | |
1793 | { | |
1794 | int rc = 0; | |
1795 | struct ctx_info *ctxi = NULL; | |
1796 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata; | |
1797 | struct device *dev = &cfg->dev->dev; | |
1798 | struct llun_info *lli = sdev->hostdata; | |
1799 | struct glun_info *gli = lli->parent; | |
1800 | struct sisl_rht_entry *rhte = NULL; | |
1801 | res_hndl_t rhndl = verify->rsrc_handle; | |
1802 | u64 ctxid = DECODE_CTXID(verify->context_id), | |
1803 | rctxid = verify->context_id; | |
1804 | u64 last_lba = 0; | |
1805 | ||
1806 | dev_dbg(dev, "%s: ctxid=%llu rhndl=%016llX, hint=%016llX, " | |
1807 | "flags=%016llX\n", __func__, ctxid, verify->rsrc_handle, | |
1808 | verify->hint, verify->hdr.flags); | |
1809 | ||
1810 | ctxi = get_context(cfg, rctxid, lli, 0); | |
1811 | if (unlikely(!ctxi)) { | |
1812 | dev_dbg(dev, "%s: Bad context! (%llu)\n", __func__, ctxid); | |
1813 | rc = -EINVAL; | |
1814 | goto out; | |
1815 | } | |
1816 | ||
1817 | rhte = get_rhte(ctxi, rhndl, lli); | |
1818 | if (unlikely(!rhte)) { | |
1819 | dev_dbg(dev, "%s: Bad resource handle! (%d)\n", | |
1820 | __func__, rhndl); | |
1821 | rc = -EINVAL; | |
1822 | goto out; | |
1823 | } | |
1824 | ||
1825 | /* | |
1826 | * Look at the hint/sense to see if it requires us to redrive | |
1827 | * inquiry (i.e. the Unit attention is due to the WWN changing). | |
1828 | */ | |
1829 | if (verify->hint & DK_CXLFLASH_VERIFY_HINT_SENSE) { | |
8e782623 MO |
1830 | /* Can't hold mutex across process_sense/read_cap16, |
1831 | * since we could have an intervening EEH event. | |
1832 | */ | |
1833 | ctxi->unavail = true; | |
1834 | mutex_unlock(&ctxi->mutex); | |
65be2c79 MO |
1835 | rc = process_sense(sdev, verify); |
1836 | if (unlikely(rc)) { | |
1837 | dev_err(dev, "%s: Failed to validate sense data (%d)\n", | |
1838 | __func__, rc); | |
8e782623 MO |
1839 | mutex_lock(&ctxi->mutex); |
1840 | ctxi->unavail = false; | |
65be2c79 MO |
1841 | goto out; |
1842 | } | |
8e782623 MO |
1843 | mutex_lock(&ctxi->mutex); |
1844 | ctxi->unavail = false; | |
65be2c79 MO |
1845 | } |
1846 | ||
1847 | switch (gli->mode) { | |
1848 | case MODE_PHYSICAL: | |
1849 | last_lba = gli->max_lba; | |
1850 | break; | |
2cb79266 MO |
1851 | case MODE_VIRTUAL: |
1852 | /* Cast lxt_cnt to u64 for multiply to be treated as 64bit op */ | |
1853 | last_lba = ((u64)rhte->lxt_cnt * MC_CHUNK_SIZE * gli->blk_len); | |
1854 | last_lba /= CXLFLASH_BLOCK_SIZE; | |
1855 | last_lba--; | |
1856 | break; | |
65be2c79 MO |
1857 | default: |
1858 | WARN(1, "Unsupported LUN mode!"); | |
1859 | } | |
1860 | ||
1861 | verify->last_lba = last_lba; | |
1862 | ||
1863 | out: | |
1864 | if (likely(ctxi)) | |
1865 | put_context(ctxi); | |
1866 | dev_dbg(dev, "%s: returning rc=%d llba=%llX\n", | |
1867 | __func__, rc, verify->last_lba); | |
1868 | return rc; | |
1869 | } | |
1870 | ||
1871 | /** | |
1872 | * decode_ioctl() - translates an encoded ioctl to an easily identifiable string | |
1873 | * @cmd: The ioctl command to decode. | |
1874 | * | |
1875 | * Return: A string identifying the decoded ioctl. | |
1876 | */ | |
1877 | static char *decode_ioctl(int cmd) | |
1878 | { | |
1879 | switch (cmd) { | |
1880 | case DK_CXLFLASH_ATTACH: | |
1881 | return __stringify_1(DK_CXLFLASH_ATTACH); | |
1882 | case DK_CXLFLASH_USER_DIRECT: | |
1883 | return __stringify_1(DK_CXLFLASH_USER_DIRECT); | |
2cb79266 MO |
1884 | case DK_CXLFLASH_USER_VIRTUAL: |
1885 | return __stringify_1(DK_CXLFLASH_USER_VIRTUAL); | |
1886 | case DK_CXLFLASH_VLUN_RESIZE: | |
1887 | return __stringify_1(DK_CXLFLASH_VLUN_RESIZE); | |
65be2c79 MO |
1888 | case DK_CXLFLASH_RELEASE: |
1889 | return __stringify_1(DK_CXLFLASH_RELEASE); | |
1890 | case DK_CXLFLASH_DETACH: | |
1891 | return __stringify_1(DK_CXLFLASH_DETACH); | |
1892 | case DK_CXLFLASH_VERIFY: | |
1893 | return __stringify_1(DK_CXLFLASH_VERIFY); | |
2cb79266 MO |
1894 | case DK_CXLFLASH_VLUN_CLONE: |
1895 | return __stringify_1(DK_CXLFLASH_VLUN_CLONE); | |
65be2c79 MO |
1896 | case DK_CXLFLASH_RECOVER_AFU: |
1897 | return __stringify_1(DK_CXLFLASH_RECOVER_AFU); | |
1898 | case DK_CXLFLASH_MANAGE_LUN: | |
1899 | return __stringify_1(DK_CXLFLASH_MANAGE_LUN); | |
1900 | } | |
1901 | ||
1902 | return "UNKNOWN"; | |
1903 | } | |
1904 | ||
1905 | /** | |
1906 | * cxlflash_disk_direct_open() - opens a direct (physical) disk | |
1907 | * @sdev: SCSI device associated with LUN. | |
1908 | * @arg: UDirect ioctl data structure. | |
1909 | * | |
1910 | * On successful return, the user is informed of the resource handle | |
1911 | * to be used to identify the direct lun and the size (in blocks) of | |
1912 | * the direct lun in last LBA format. | |
1913 | * | |
1914 | * Return: 0 on success, -errno on failure | |
1915 | */ | |
1916 | static int cxlflash_disk_direct_open(struct scsi_device *sdev, void *arg) | |
1917 | { | |
1918 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata; | |
1919 | struct device *dev = &cfg->dev->dev; | |
1920 | struct afu *afu = cfg->afu; | |
1921 | struct llun_info *lli = sdev->hostdata; | |
1922 | struct glun_info *gli = lli->parent; | |
1923 | ||
1924 | struct dk_cxlflash_udirect *pphys = (struct dk_cxlflash_udirect *)arg; | |
1925 | ||
1926 | u64 ctxid = DECODE_CTXID(pphys->context_id), | |
1927 | rctxid = pphys->context_id; | |
1928 | u64 lun_size = 0; | |
1929 | u64 last_lba = 0; | |
1930 | u64 rsrc_handle = -1; | |
1931 | u32 port = CHAN2PORT(sdev->channel); | |
1932 | ||
1933 | int rc = 0; | |
1934 | ||
1935 | struct ctx_info *ctxi = NULL; | |
1936 | struct sisl_rht_entry *rhte = NULL; | |
1937 | ||
1938 | pr_debug("%s: ctxid=%llu ls=0x%llx\n", __func__, ctxid, lun_size); | |
1939 | ||
1940 | rc = cxlflash_lun_attach(gli, MODE_PHYSICAL, false); | |
1941 | if (unlikely(rc)) { | |
1942 | dev_dbg(dev, "%s: Failed to attach to LUN! (PHYSICAL)\n", | |
1943 | __func__); | |
1944 | goto out; | |
1945 | } | |
1946 | ||
1947 | ctxi = get_context(cfg, rctxid, lli, 0); | |
1948 | if (unlikely(!ctxi)) { | |
1949 | dev_dbg(dev, "%s: Bad context! (%llu)\n", __func__, ctxid); | |
1950 | rc = -EINVAL; | |
1951 | goto err1; | |
1952 | } | |
1953 | ||
1954 | rhte = rhte_checkout(ctxi, lli); | |
1955 | if (unlikely(!rhte)) { | |
1956 | dev_dbg(dev, "%s: too many opens for this context\n", __func__); | |
1957 | rc = -EMFILE; /* too many opens */ | |
1958 | goto err1; | |
1959 | } | |
1960 | ||
1961 | rsrc_handle = (rhte - ctxi->rht_start); | |
1962 | ||
1963 | rht_format1(rhte, lli->lun_id[sdev->channel], ctxi->rht_perms, port); | |
1964 | cxlflash_afu_sync(afu, ctxid, rsrc_handle, AFU_LW_SYNC); | |
1965 | ||
1966 | last_lba = gli->max_lba; | |
1967 | pphys->hdr.return_flags = 0; | |
1968 | pphys->last_lba = last_lba; | |
1969 | pphys->rsrc_handle = rsrc_handle; | |
1970 | ||
1971 | out: | |
1972 | if (likely(ctxi)) | |
1973 | put_context(ctxi); | |
1974 | dev_dbg(dev, "%s: returning handle 0x%llx rc=%d llba %lld\n", | |
1975 | __func__, rsrc_handle, rc, last_lba); | |
1976 | return rc; | |
1977 | ||
1978 | err1: | |
1979 | cxlflash_lun_detach(gli); | |
1980 | goto out; | |
1981 | } | |
1982 | ||
1983 | /** | |
1984 | * ioctl_common() - common IOCTL handler for driver | |
1985 | * @sdev: SCSI device associated with LUN. | |
1986 | * @cmd: IOCTL command. | |
1987 | * | |
1988 | * Handles common fencing operations that are valid for multiple ioctls. Always | |
1989 | * allow through ioctls that are cleanup oriented in nature, even when operating | |
1990 | * in a failed/terminating state. | |
1991 | * | |
1992 | * Return: 0 on success, -errno on failure | |
1993 | */ | |
1994 | static int ioctl_common(struct scsi_device *sdev, int cmd) | |
1995 | { | |
1996 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata; | |
1997 | struct device *dev = &cfg->dev->dev; | |
1998 | struct llun_info *lli = sdev->hostdata; | |
1999 | int rc = 0; | |
2000 | ||
2001 | if (unlikely(!lli)) { | |
2002 | dev_dbg(dev, "%s: Unknown LUN\n", __func__); | |
2003 | rc = -EINVAL; | |
2004 | goto out; | |
2005 | } | |
2006 | ||
2007 | rc = check_state(cfg); | |
2008 | if (unlikely(rc) && (cfg->state == STATE_FAILTERM)) { | |
2009 | switch (cmd) { | |
2cb79266 | 2010 | case DK_CXLFLASH_VLUN_RESIZE: |
65be2c79 MO |
2011 | case DK_CXLFLASH_RELEASE: |
2012 | case DK_CXLFLASH_DETACH: | |
2013 | dev_dbg(dev, "%s: Command override! (%d)\n", | |
2014 | __func__, rc); | |
2015 | rc = 0; | |
2016 | break; | |
2017 | } | |
2018 | } | |
2019 | out: | |
2020 | return rc; | |
2021 | } | |
2022 | ||
2023 | /** | |
2024 | * cxlflash_ioctl() - IOCTL handler for driver | |
2025 | * @sdev: SCSI device associated with LUN. | |
2026 | * @cmd: IOCTL command. | |
2027 | * @arg: Userspace ioctl data structure. | |
2028 | * | |
0a27ae51 MO |
2029 | * A read/write semaphore is used to implement a 'drain' of currently |
2030 | * running ioctls. The read semaphore is taken at the beginning of each | |
2031 | * ioctl thread and released upon concluding execution. Additionally the | |
2032 | * semaphore should be released and then reacquired in any ioctl execution | |
2033 | * path which will wait for an event to occur that is outside the scope of | |
2034 | * the ioctl (i.e. an adapter reset). To drain the ioctls currently running, | |
2035 | * a thread simply needs to acquire the write semaphore. | |
2036 | * | |
65be2c79 MO |
2037 | * Return: 0 on success, -errno on failure |
2038 | */ | |
2039 | int cxlflash_ioctl(struct scsi_device *sdev, int cmd, void __user *arg) | |
2040 | { | |
2041 | typedef int (*sioctl) (struct scsi_device *, void *); | |
2042 | ||
2043 | struct cxlflash_cfg *cfg = (struct cxlflash_cfg *)sdev->host->hostdata; | |
2044 | struct device *dev = &cfg->dev->dev; | |
2045 | struct afu *afu = cfg->afu; | |
2046 | struct dk_cxlflash_hdr *hdr; | |
2047 | char buf[sizeof(union cxlflash_ioctls)]; | |
2048 | size_t size = 0; | |
2049 | bool known_ioctl = false; | |
2050 | int idx; | |
2051 | int rc = 0; | |
2052 | struct Scsi_Host *shost = sdev->host; | |
2053 | sioctl do_ioctl = NULL; | |
2054 | ||
2055 | static const struct { | |
2056 | size_t size; | |
2057 | sioctl ioctl; | |
2058 | } ioctl_tbl[] = { /* NOTE: order matters here */ | |
2059 | {sizeof(struct dk_cxlflash_attach), (sioctl)cxlflash_disk_attach}, | |
2060 | {sizeof(struct dk_cxlflash_udirect), cxlflash_disk_direct_open}, | |
2061 | {sizeof(struct dk_cxlflash_release), (sioctl)cxlflash_disk_release}, | |
2062 | {sizeof(struct dk_cxlflash_detach), (sioctl)cxlflash_disk_detach}, | |
2063 | {sizeof(struct dk_cxlflash_verify), (sioctl)cxlflash_disk_verify}, | |
2064 | {sizeof(struct dk_cxlflash_recover_afu), (sioctl)cxlflash_afu_recover}, | |
2065 | {sizeof(struct dk_cxlflash_manage_lun), (sioctl)cxlflash_manage_lun}, | |
2cb79266 MO |
2066 | {sizeof(struct dk_cxlflash_uvirtual), cxlflash_disk_virtual_open}, |
2067 | {sizeof(struct dk_cxlflash_resize), (sioctl)cxlflash_vlun_resize}, | |
2068 | {sizeof(struct dk_cxlflash_clone), (sioctl)cxlflash_disk_clone}, | |
65be2c79 MO |
2069 | }; |
2070 | ||
0a27ae51 MO |
2071 | /* Hold read semaphore so we can drain if needed */ |
2072 | down_read(&cfg->ioctl_rwsem); | |
2073 | ||
65be2c79 MO |
2074 | /* Restrict command set to physical support only for internal LUN */ |
2075 | if (afu->internal_lun) | |
2076 | switch (cmd) { | |
2077 | case DK_CXLFLASH_RELEASE: | |
2cb79266 MO |
2078 | case DK_CXLFLASH_USER_VIRTUAL: |
2079 | case DK_CXLFLASH_VLUN_RESIZE: | |
2080 | case DK_CXLFLASH_VLUN_CLONE: | |
65be2c79 MO |
2081 | dev_dbg(dev, "%s: %s not supported for lun_mode=%d\n", |
2082 | __func__, decode_ioctl(cmd), afu->internal_lun); | |
2083 | rc = -EINVAL; | |
2084 | goto cxlflash_ioctl_exit; | |
2085 | } | |
2086 | ||
2087 | switch (cmd) { | |
2088 | case DK_CXLFLASH_ATTACH: | |
2089 | case DK_CXLFLASH_USER_DIRECT: | |
2090 | case DK_CXLFLASH_RELEASE: | |
2091 | case DK_CXLFLASH_DETACH: | |
2092 | case DK_CXLFLASH_VERIFY: | |
2093 | case DK_CXLFLASH_RECOVER_AFU: | |
2cb79266 MO |
2094 | case DK_CXLFLASH_USER_VIRTUAL: |
2095 | case DK_CXLFLASH_VLUN_RESIZE: | |
2096 | case DK_CXLFLASH_VLUN_CLONE: | |
65be2c79 MO |
2097 | dev_dbg(dev, "%s: %s (%08X) on dev(%d/%d/%d/%llu)\n", |
2098 | __func__, decode_ioctl(cmd), cmd, shost->host_no, | |
2099 | sdev->channel, sdev->id, sdev->lun); | |
2100 | rc = ioctl_common(sdev, cmd); | |
2101 | if (unlikely(rc)) | |
2102 | goto cxlflash_ioctl_exit; | |
2103 | ||
2104 | /* fall through */ | |
2105 | ||
2106 | case DK_CXLFLASH_MANAGE_LUN: | |
2107 | known_ioctl = true; | |
2108 | idx = _IOC_NR(cmd) - _IOC_NR(DK_CXLFLASH_ATTACH); | |
2109 | size = ioctl_tbl[idx].size; | |
2110 | do_ioctl = ioctl_tbl[idx].ioctl; | |
2111 | ||
2112 | if (likely(do_ioctl)) | |
2113 | break; | |
2114 | ||
2115 | /* fall through */ | |
2116 | default: | |
2117 | rc = -EINVAL; | |
2118 | goto cxlflash_ioctl_exit; | |
2119 | } | |
2120 | ||
2121 | if (unlikely(copy_from_user(&buf, arg, size))) { | |
2122 | dev_err(dev, "%s: copy_from_user() fail! " | |
2123 | "size=%lu cmd=%d (%s) arg=%p\n", | |
2124 | __func__, size, cmd, decode_ioctl(cmd), arg); | |
2125 | rc = -EFAULT; | |
2126 | goto cxlflash_ioctl_exit; | |
2127 | } | |
2128 | ||
2129 | hdr = (struct dk_cxlflash_hdr *)&buf; | |
2130 | if (hdr->version != DK_CXLFLASH_VERSION_0) { | |
2131 | dev_dbg(dev, "%s: Version %u not supported for %s\n", | |
2132 | __func__, hdr->version, decode_ioctl(cmd)); | |
2133 | rc = -EINVAL; | |
2134 | goto cxlflash_ioctl_exit; | |
2135 | } | |
2136 | ||
2137 | if (hdr->rsvd[0] || hdr->rsvd[1] || hdr->rsvd[2] || hdr->return_flags) { | |
2138 | dev_dbg(dev, "%s: Reserved/rflags populated!\n", __func__); | |
2139 | rc = -EINVAL; | |
2140 | goto cxlflash_ioctl_exit; | |
2141 | } | |
2142 | ||
2143 | rc = do_ioctl(sdev, (void *)&buf); | |
2144 | if (likely(!rc)) | |
2145 | if (unlikely(copy_to_user(arg, &buf, size))) { | |
2146 | dev_err(dev, "%s: copy_to_user() fail! " | |
2147 | "size=%lu cmd=%d (%s) arg=%p\n", | |
2148 | __func__, size, cmd, decode_ioctl(cmd), arg); | |
2149 | rc = -EFAULT; | |
2150 | } | |
2151 | ||
2152 | /* fall through to exit */ | |
2153 | ||
2154 | cxlflash_ioctl_exit: | |
0a27ae51 | 2155 | up_read(&cfg->ioctl_rwsem); |
65be2c79 MO |
2156 | if (unlikely(rc && known_ioctl)) |
2157 | dev_err(dev, "%s: ioctl %s (%08X) on dev(%d/%d/%d/%llu) " | |
2158 | "returned rc %d\n", __func__, | |
2159 | decode_ioctl(cmd), cmd, shost->host_no, | |
2160 | sdev->channel, sdev->id, sdev->lun, rc); | |
2161 | else | |
2162 | dev_dbg(dev, "%s: ioctl %s (%08X) on dev(%d/%d/%d/%llu) " | |
2163 | "returned rc %d\n", __func__, decode_ioctl(cmd), | |
2164 | cmd, shost->host_no, sdev->channel, sdev->id, | |
2165 | sdev->lun, rc); | |
2166 | return rc; | |
2167 | } |