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1 | /******************************************************************************* |
2 | * IBM Virtual SCSI Target Driver | |
3 | * Copyright (C) 2003-2005 Dave Boutcher (boutcher@us.ibm.com) IBM Corp. | |
4 | * Santiago Leon (santil@us.ibm.com) IBM Corp. | |
5 | * Linda Xie (lxie@us.ibm.com) IBM Corp. | |
6 | * | |
7 | * Copyright (C) 2005-2011 FUJITA Tomonori <tomof@acm.org> | |
8 | * Copyright (C) 2010 Nicholas A. Bellinger <nab@kernel.org> | |
9 | * | |
10 | * Authors: Bryant G. Ly <bryantly@linux.vnet.ibm.com> | |
11 | * Authors: Michael Cyr <mikecyr@linux.vnet.ibm.com> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | ****************************************************************************/ | |
24 | ||
25 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
26 | ||
27 | #include <linux/module.h> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/types.h> | |
31 | #include <linux/list.h> | |
32 | #include <linux/string.h> | |
33 | ||
34 | #include <target/target_core_base.h> | |
35 | #include <target/target_core_fabric.h> | |
36 | ||
37 | #include <asm/hvcall.h> | |
38 | #include <asm/vio.h> | |
39 | ||
40 | #include <scsi/viosrp.h> | |
41 | ||
42 | #include "ibmvscsi_tgt.h" | |
43 | ||
44 | #define IBMVSCSIS_VERSION "v0.2" | |
45 | ||
46 | #define INITIAL_SRP_LIMIT 800 | |
47 | #define DEFAULT_MAX_SECTORS 256 | |
48 | ||
49 | static uint max_vdma_size = MAX_H_COPY_RDMA; | |
50 | ||
51 | static char system_id[SYS_ID_NAME_LEN] = ""; | |
52 | static char partition_name[PARTITION_NAMELEN] = "UNKNOWN"; | |
53 | static uint partition_number = -1; | |
54 | ||
55 | /* Adapter list and lock to control it */ | |
56 | static DEFINE_SPINLOCK(ibmvscsis_dev_lock); | |
57 | static LIST_HEAD(ibmvscsis_dev_list); | |
58 | ||
59 | static long ibmvscsis_parse_command(struct scsi_info *vscsi, | |
60 | struct viosrp_crq *crq); | |
61 | ||
62 | static void ibmvscsis_adapter_idle(struct scsi_info *vscsi); | |
63 | ||
64 | static void ibmvscsis_determine_resid(struct se_cmd *se_cmd, | |
65 | struct srp_rsp *rsp) | |
66 | { | |
67 | u32 residual_count = se_cmd->residual_count; | |
68 | ||
69 | if (!residual_count) | |
70 | return; | |
71 | ||
72 | if (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { | |
73 | if (se_cmd->data_direction == DMA_TO_DEVICE) { | |
74 | /* residual data from an underflow write */ | |
75 | rsp->flags = SRP_RSP_FLAG_DOUNDER; | |
76 | rsp->data_out_res_cnt = cpu_to_be32(residual_count); | |
77 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { | |
78 | /* residual data from an underflow read */ | |
79 | rsp->flags = SRP_RSP_FLAG_DIUNDER; | |
80 | rsp->data_in_res_cnt = cpu_to_be32(residual_count); | |
81 | } | |
82 | } else if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
83 | if (se_cmd->data_direction == DMA_TO_DEVICE) { | |
84 | /* residual data from an overflow write */ | |
85 | rsp->flags = SRP_RSP_FLAG_DOOVER; | |
86 | rsp->data_out_res_cnt = cpu_to_be32(residual_count); | |
87 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { | |
88 | /* residual data from an overflow read */ | |
89 | rsp->flags = SRP_RSP_FLAG_DIOVER; | |
90 | rsp->data_in_res_cnt = cpu_to_be32(residual_count); | |
91 | } | |
92 | } | |
93 | } | |
94 | ||
95 | /** | |
96 | * connection_broken() - Determine if the connection to the client is good | |
97 | * @vscsi: Pointer to our adapter structure | |
98 | * | |
99 | * This function attempts to send a ping MAD to the client. If the call to | |
100 | * queue the request returns H_CLOSED then the connection has been broken | |
101 | * and the function returns TRUE. | |
102 | * | |
103 | * EXECUTION ENVIRONMENT: | |
104 | * Interrupt or Process environment | |
105 | */ | |
106 | static bool connection_broken(struct scsi_info *vscsi) | |
107 | { | |
108 | struct viosrp_crq *crq; | |
109 | u64 buffer[2] = { 0, 0 }; | |
110 | long h_return_code; | |
111 | bool rc = false; | |
112 | ||
113 | /* create a PING crq */ | |
114 | crq = (struct viosrp_crq *)&buffer; | |
115 | crq->valid = VALID_CMD_RESP_EL; | |
116 | crq->format = MESSAGE_IN_CRQ; | |
117 | crq->status = PING; | |
118 | ||
119 | h_return_code = h_send_crq(vscsi->dds.unit_id, | |
120 | cpu_to_be64(buffer[MSG_HI]), | |
121 | cpu_to_be64(buffer[MSG_LOW])); | |
122 | ||
123 | pr_debug("connection_broken: rc %ld\n", h_return_code); | |
124 | ||
125 | if (h_return_code == H_CLOSED) | |
126 | rc = true; | |
127 | ||
128 | return rc; | |
129 | } | |
130 | ||
131 | /** | |
132 | * ibmvscsis_unregister_command_q() - Helper Function-Unregister Command Queue | |
133 | * @vscsi: Pointer to our adapter structure | |
134 | * | |
135 | * This function calls h_free_q then frees the interrupt bit etc. | |
136 | * It must release the lock before doing so because of the time it can take | |
137 | * for h_free_crq in PHYP | |
138 | * NOTE: the caller must make sure that state and or flags will prevent | |
139 | * interrupt handler from scheduling work. | |
140 | * NOTE: anyone calling this function may need to set the CRQ_CLOSED flag | |
141 | * we can't do it here, because we don't have the lock | |
142 | * | |
143 | * EXECUTION ENVIRONMENT: | |
144 | * Process level | |
145 | */ | |
146 | static long ibmvscsis_unregister_command_q(struct scsi_info *vscsi) | |
147 | { | |
148 | long qrc; | |
149 | long rc = ADAPT_SUCCESS; | |
150 | int ticks = 0; | |
151 | ||
152 | do { | |
153 | qrc = h_free_crq(vscsi->dds.unit_id); | |
154 | switch (qrc) { | |
155 | case H_SUCCESS: | |
156 | break; | |
157 | ||
158 | case H_HARDWARE: | |
159 | case H_PARAMETER: | |
160 | dev_err(&vscsi->dev, "unregister_command_q: error from h_free_crq %ld\n", | |
161 | qrc); | |
162 | rc = ERROR; | |
163 | break; | |
164 | ||
165 | case H_BUSY: | |
166 | case H_LONG_BUSY_ORDER_1_MSEC: | |
167 | /* msleep not good for small values */ | |
168 | usleep_range(1000, 2000); | |
169 | ticks += 1; | |
170 | break; | |
171 | case H_LONG_BUSY_ORDER_10_MSEC: | |
172 | usleep_range(10000, 20000); | |
173 | ticks += 10; | |
174 | break; | |
175 | case H_LONG_BUSY_ORDER_100_MSEC: | |
176 | msleep(100); | |
177 | ticks += 100; | |
178 | break; | |
179 | case H_LONG_BUSY_ORDER_1_SEC: | |
180 | ssleep(1); | |
181 | ticks += 1000; | |
182 | break; | |
183 | case H_LONG_BUSY_ORDER_10_SEC: | |
184 | ssleep(10); | |
185 | ticks += 10000; | |
186 | break; | |
187 | case H_LONG_BUSY_ORDER_100_SEC: | |
188 | ssleep(100); | |
189 | ticks += 100000; | |
190 | break; | |
191 | default: | |
192 | dev_err(&vscsi->dev, "unregister_command_q: unknown error %ld from h_free_crq\n", | |
193 | qrc); | |
194 | rc = ERROR; | |
195 | break; | |
196 | } | |
197 | ||
198 | /* | |
199 | * dont wait more then 300 seconds | |
200 | * ticks are in milliseconds more or less | |
201 | */ | |
202 | if (ticks > 300000 && qrc != H_SUCCESS) { | |
203 | rc = ERROR; | |
204 | dev_err(&vscsi->dev, "Excessive wait for h_free_crq\n"); | |
205 | } | |
206 | } while (qrc != H_SUCCESS && rc == ADAPT_SUCCESS); | |
207 | ||
208 | pr_debug("Freeing CRQ: phyp rc %ld, rc %ld\n", qrc, rc); | |
209 | ||
210 | return rc; | |
211 | } | |
212 | ||
213 | /** | |
214 | * ibmvscsis_delete_client_info() - Helper function to Delete Client Info | |
215 | * @vscsi: Pointer to our adapter structure | |
216 | * @client_closed: True if client closed its queue | |
217 | * | |
218 | * Deletes information specific to the client when the client goes away | |
219 | * | |
220 | * EXECUTION ENVIRONMENT: | |
221 | * Interrupt or Process | |
222 | */ | |
223 | static void ibmvscsis_delete_client_info(struct scsi_info *vscsi, | |
224 | bool client_closed) | |
225 | { | |
226 | vscsi->client_cap = 0; | |
227 | ||
228 | /* | |
229 | * Some things we don't want to clear if we're closing the queue, | |
230 | * because some clients don't resend the host handshake when they | |
231 | * get a transport event. | |
232 | */ | |
233 | if (client_closed) | |
234 | vscsi->client_data.os_type = 0; | |
235 | } | |
236 | ||
237 | /** | |
238 | * ibmvscsis_free_command_q() - Free Command Queue | |
239 | * @vscsi: Pointer to our adapter structure | |
240 | * | |
241 | * This function calls unregister_command_q, then clears interrupts and | |
242 | * any pending interrupt acknowledgments associated with the command q. | |
243 | * It also clears memory if there is no error. | |
244 | * | |
245 | * PHYP did not meet the PAPR architecture so that we must give up the | |
246 | * lock. This causes a timing hole regarding state change. To close the | |
247 | * hole this routine does accounting on any change that occurred during | |
248 | * the time the lock is not held. | |
249 | * NOTE: must give up and then acquire the interrupt lock, the caller must | |
250 | * make sure that state and or flags will prevent interrupt handler from | |
251 | * scheduling work. | |
252 | * | |
253 | * EXECUTION ENVIRONMENT: | |
254 | * Process level, interrupt lock is held | |
255 | */ | |
256 | static long ibmvscsis_free_command_q(struct scsi_info *vscsi) | |
257 | { | |
258 | int bytes; | |
259 | u32 flags_under_lock; | |
260 | u16 state_under_lock; | |
261 | long rc = ADAPT_SUCCESS; | |
262 | ||
263 | if (!(vscsi->flags & CRQ_CLOSED)) { | |
264 | vio_disable_interrupts(vscsi->dma_dev); | |
265 | ||
266 | state_under_lock = vscsi->new_state; | |
267 | flags_under_lock = vscsi->flags; | |
268 | vscsi->phyp_acr_state = 0; | |
269 | vscsi->phyp_acr_flags = 0; | |
270 | ||
271 | spin_unlock_bh(&vscsi->intr_lock); | |
272 | rc = ibmvscsis_unregister_command_q(vscsi); | |
273 | spin_lock_bh(&vscsi->intr_lock); | |
274 | ||
275 | if (state_under_lock != vscsi->new_state) | |
276 | vscsi->phyp_acr_state = vscsi->new_state; | |
277 | ||
278 | vscsi->phyp_acr_flags = ((~flags_under_lock) & vscsi->flags); | |
279 | ||
280 | if (rc == ADAPT_SUCCESS) { | |
281 | bytes = vscsi->cmd_q.size * PAGE_SIZE; | |
282 | memset(vscsi->cmd_q.base_addr, 0, bytes); | |
283 | vscsi->cmd_q.index = 0; | |
284 | vscsi->flags |= CRQ_CLOSED; | |
285 | ||
286 | ibmvscsis_delete_client_info(vscsi, false); | |
287 | } | |
288 | ||
289 | pr_debug("free_command_q: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n", | |
290 | vscsi->flags, vscsi->state, vscsi->phyp_acr_flags, | |
291 | vscsi->phyp_acr_state); | |
292 | } | |
293 | return rc; | |
294 | } | |
295 | ||
296 | /** | |
297 | * ibmvscsis_cmd_q_dequeue() - Get valid Command element | |
298 | * @mask: Mask to use in case index wraps | |
299 | * @current_index: Current index into command queue | |
300 | * @base_addr: Pointer to start of command queue | |
301 | * | |
302 | * Returns a pointer to a valid command element or NULL, if the command | |
303 | * queue is empty | |
304 | * | |
305 | * EXECUTION ENVIRONMENT: | |
306 | * Interrupt environment, interrupt lock held | |
307 | */ | |
308 | static struct viosrp_crq *ibmvscsis_cmd_q_dequeue(uint mask, | |
309 | uint *current_index, | |
310 | struct viosrp_crq *base_addr) | |
311 | { | |
312 | struct viosrp_crq *ptr; | |
313 | ||
314 | ptr = base_addr + *current_index; | |
315 | ||
316 | if (ptr->valid) { | |
317 | *current_index = (*current_index + 1) & mask; | |
318 | dma_rmb(); | |
319 | } else { | |
320 | ptr = NULL; | |
321 | } | |
322 | ||
323 | return ptr; | |
324 | } | |
325 | ||
326 | /** | |
327 | * ibmvscsis_send_init_message() - send initialize message to the client | |
328 | * @vscsi: Pointer to our adapter structure | |
329 | * @format: Which Init Message format to send | |
330 | * | |
331 | * EXECUTION ENVIRONMENT: | |
332 | * Interrupt environment interrupt lock held | |
333 | */ | |
334 | static long ibmvscsis_send_init_message(struct scsi_info *vscsi, u8 format) | |
335 | { | |
336 | struct viosrp_crq *crq; | |
337 | u64 buffer[2] = { 0, 0 }; | |
338 | long rc; | |
339 | ||
340 | crq = (struct viosrp_crq *)&buffer; | |
341 | crq->valid = VALID_INIT_MSG; | |
342 | crq->format = format; | |
343 | rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]), | |
344 | cpu_to_be64(buffer[MSG_LOW])); | |
345 | ||
346 | return rc; | |
347 | } | |
348 | ||
349 | /** | |
350 | * ibmvscsis_check_init_msg() - Check init message valid | |
351 | * @vscsi: Pointer to our adapter structure | |
352 | * @format: Pointer to return format of Init Message, if any. | |
353 | * Set to UNUSED_FORMAT if no Init Message in queue. | |
354 | * | |
355 | * Checks if an initialize message was queued by the initiatior | |
356 | * after the queue was created and before the interrupt was enabled. | |
357 | * | |
358 | * EXECUTION ENVIRONMENT: | |
359 | * Process level only, interrupt lock held | |
360 | */ | |
361 | static long ibmvscsis_check_init_msg(struct scsi_info *vscsi, uint *format) | |
362 | { | |
363 | struct viosrp_crq *crq; | |
364 | long rc = ADAPT_SUCCESS; | |
365 | ||
366 | crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask, &vscsi->cmd_q.index, | |
367 | vscsi->cmd_q.base_addr); | |
368 | if (!crq) { | |
369 | *format = (uint)UNUSED_FORMAT; | |
370 | } else if (crq->valid == VALID_INIT_MSG && crq->format == INIT_MSG) { | |
371 | *format = (uint)INIT_MSG; | |
372 | crq->valid = INVALIDATE_CMD_RESP_EL; | |
373 | dma_rmb(); | |
374 | ||
375 | /* | |
376 | * the caller has ensured no initialize message was | |
377 | * sent after the queue was | |
378 | * created so there should be no other message on the queue. | |
379 | */ | |
380 | crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask, | |
381 | &vscsi->cmd_q.index, | |
382 | vscsi->cmd_q.base_addr); | |
383 | if (crq) { | |
384 | *format = (uint)(crq->format); | |
385 | rc = ERROR; | |
386 | crq->valid = INVALIDATE_CMD_RESP_EL; | |
387 | dma_rmb(); | |
388 | } | |
389 | } else { | |
390 | *format = (uint)(crq->format); | |
391 | rc = ERROR; | |
392 | crq->valid = INVALIDATE_CMD_RESP_EL; | |
393 | dma_rmb(); | |
394 | } | |
395 | ||
396 | return rc; | |
397 | } | |
398 | ||
399 | /** | |
400 | * ibmvscsis_establish_new_q() - Establish new CRQ queue | |
401 | * @vscsi: Pointer to our adapter structure | |
402 | * @new_state: New state being established after resetting the queue | |
403 | * | |
404 | * Must be called with interrupt lock held. | |
405 | */ | |
406 | static long ibmvscsis_establish_new_q(struct scsi_info *vscsi, uint new_state) | |
407 | { | |
408 | long rc = ADAPT_SUCCESS; | |
409 | uint format; | |
410 | ||
411 | vscsi->flags &= PRESERVE_FLAG_FIELDS; | |
412 | vscsi->rsp_q_timer.timer_pops = 0; | |
413 | vscsi->debit = 0; | |
414 | vscsi->credit = 0; | |
415 | ||
416 | rc = vio_enable_interrupts(vscsi->dma_dev); | |
417 | if (rc) { | |
418 | pr_warn("reset_queue: failed to enable interrupts, rc %ld\n", | |
419 | rc); | |
420 | return rc; | |
421 | } | |
422 | ||
423 | rc = ibmvscsis_check_init_msg(vscsi, &format); | |
424 | if (rc) { | |
425 | dev_err(&vscsi->dev, "reset_queue: check_init_msg failed, rc %ld\n", | |
426 | rc); | |
427 | return rc; | |
428 | } | |
429 | ||
430 | if (format == UNUSED_FORMAT && new_state == WAIT_CONNECTION) { | |
431 | rc = ibmvscsis_send_init_message(vscsi, INIT_MSG); | |
432 | switch (rc) { | |
433 | case H_SUCCESS: | |
434 | case H_DROPPED: | |
435 | case H_CLOSED: | |
436 | rc = ADAPT_SUCCESS; | |
437 | break; | |
438 | ||
439 | case H_PARAMETER: | |
440 | case H_HARDWARE: | |
441 | break; | |
442 | ||
443 | default: | |
444 | vscsi->state = UNDEFINED; | |
445 | rc = H_HARDWARE; | |
446 | break; | |
447 | } | |
448 | } | |
449 | ||
450 | return rc; | |
451 | } | |
452 | ||
453 | /** | |
454 | * ibmvscsis_reset_queue() - Reset CRQ Queue | |
455 | * @vscsi: Pointer to our adapter structure | |
456 | * @new_state: New state to establish after resetting the queue | |
457 | * | |
458 | * This function calls h_free_q and then calls h_reg_q and does all | |
459 | * of the bookkeeping to get us back to where we can communicate. | |
460 | * | |
461 | * Actually, we don't always call h_free_crq. A problem was discovered | |
462 | * where one partition would close and reopen his queue, which would | |
463 | * cause his partner to get a transport event, which would cause him to | |
464 | * close and reopen his queue, which would cause the original partition | |
465 | * to get a transport event, etc., etc. To prevent this, we don't | |
466 | * actually close our queue if the client initiated the reset, (i.e. | |
467 | * either we got a transport event or we have detected that the client's | |
468 | * queue is gone) | |
469 | * | |
470 | * EXECUTION ENVIRONMENT: | |
471 | * Process environment, called with interrupt lock held | |
472 | */ | |
473 | static void ibmvscsis_reset_queue(struct scsi_info *vscsi, uint new_state) | |
474 | { | |
475 | int bytes; | |
476 | long rc = ADAPT_SUCCESS; | |
477 | ||
478 | pr_debug("reset_queue: flags 0x%x\n", vscsi->flags); | |
479 | ||
480 | /* don't reset, the client did it for us */ | |
481 | if (vscsi->flags & (CLIENT_FAILED | TRANS_EVENT)) { | |
482 | vscsi->flags &= PRESERVE_FLAG_FIELDS; | |
483 | vscsi->rsp_q_timer.timer_pops = 0; | |
484 | vscsi->debit = 0; | |
485 | vscsi->credit = 0; | |
486 | vscsi->state = new_state; | |
487 | vio_enable_interrupts(vscsi->dma_dev); | |
488 | } else { | |
489 | rc = ibmvscsis_free_command_q(vscsi); | |
490 | if (rc == ADAPT_SUCCESS) { | |
491 | vscsi->state = new_state; | |
492 | ||
493 | bytes = vscsi->cmd_q.size * PAGE_SIZE; | |
494 | rc = h_reg_crq(vscsi->dds.unit_id, | |
495 | vscsi->cmd_q.crq_token, bytes); | |
496 | if (rc == H_CLOSED || rc == H_SUCCESS) { | |
497 | rc = ibmvscsis_establish_new_q(vscsi, | |
498 | new_state); | |
499 | } | |
500 | ||
501 | if (rc != ADAPT_SUCCESS) { | |
502 | pr_debug("reset_queue: reg_crq rc %ld\n", rc); | |
503 | ||
504 | vscsi->state = ERR_DISCONNECTED; | |
505 | vscsi->flags |= RESPONSE_Q_DOWN; | |
506 | ibmvscsis_free_command_q(vscsi); | |
507 | } | |
508 | } else { | |
509 | vscsi->state = ERR_DISCONNECTED; | |
510 | vscsi->flags |= RESPONSE_Q_DOWN; | |
511 | } | |
512 | } | |
513 | } | |
514 | ||
515 | /** | |
516 | * ibmvscsis_free_cmd_resources() - Free command resources | |
517 | * @vscsi: Pointer to our adapter structure | |
518 | * @cmd: Command which is not longer in use | |
519 | * | |
520 | * Must be called with interrupt lock held. | |
521 | */ | |
522 | static void ibmvscsis_free_cmd_resources(struct scsi_info *vscsi, | |
523 | struct ibmvscsis_cmd *cmd) | |
524 | { | |
525 | struct iu_entry *iue = cmd->iue; | |
526 | ||
527 | switch (cmd->type) { | |
528 | case TASK_MANAGEMENT: | |
529 | case SCSI_CDB: | |
530 | /* | |
531 | * When the queue goes down this value is cleared, so it | |
532 | * cannot be cleared in this general purpose function. | |
533 | */ | |
534 | if (vscsi->debit) | |
535 | vscsi->debit -= 1; | |
536 | break; | |
537 | case ADAPTER_MAD: | |
538 | vscsi->flags &= ~PROCESSING_MAD; | |
539 | break; | |
540 | case UNSET_TYPE: | |
541 | break; | |
542 | default: | |
543 | dev_err(&vscsi->dev, "free_cmd_resources unknown type %d\n", | |
544 | cmd->type); | |
545 | break; | |
546 | } | |
547 | ||
548 | cmd->iue = NULL; | |
549 | list_add_tail(&cmd->list, &vscsi->free_cmd); | |
550 | srp_iu_put(iue); | |
551 | ||
552 | if (list_empty(&vscsi->active_q) && list_empty(&vscsi->schedule_q) && | |
553 | list_empty(&vscsi->waiting_rsp) && (vscsi->flags & WAIT_FOR_IDLE)) { | |
554 | vscsi->flags &= ~WAIT_FOR_IDLE; | |
555 | complete(&vscsi->wait_idle); | |
556 | } | |
557 | } | |
558 | ||
559 | /** | |
560 | * ibmvscsis_disconnect() - Helper function to disconnect | |
561 | * @work: Pointer to work_struct, gives access to our adapter structure | |
562 | * | |
563 | * An error has occurred or the driver received a Transport event, | |
564 | * and the driver is requesting that the command queue be de-registered | |
565 | * in a safe manner. If there is no outstanding I/O then we can stop the | |
566 | * queue. If we are restarting the queue it will be reflected in the | |
567 | * the state of the adapter. | |
568 | * | |
569 | * EXECUTION ENVIRONMENT: | |
570 | * Process environment | |
571 | */ | |
572 | static void ibmvscsis_disconnect(struct work_struct *work) | |
573 | { | |
574 | struct scsi_info *vscsi = container_of(work, struct scsi_info, | |
575 | proc_work); | |
576 | u16 new_state; | |
577 | bool wait_idle = false; | |
578 | long rc = ADAPT_SUCCESS; | |
579 | ||
580 | spin_lock_bh(&vscsi->intr_lock); | |
581 | new_state = vscsi->new_state; | |
582 | vscsi->new_state = 0; | |
583 | ||
584 | pr_debug("disconnect: flags 0x%x, state 0x%hx\n", vscsi->flags, | |
585 | vscsi->state); | |
586 | ||
587 | /* | |
588 | * check which state we are in and see if we | |
589 | * should transitition to the new state | |
590 | */ | |
591 | switch (vscsi->state) { | |
592 | /* Should never be called while in this state. */ | |
593 | case NO_QUEUE: | |
594 | /* | |
595 | * Can never transition from this state; | |
596 | * igonore errors and logout. | |
597 | */ | |
598 | case UNCONFIGURING: | |
599 | break; | |
600 | ||
601 | /* can transition from this state to UNCONFIGURING */ | |
602 | case ERR_DISCONNECT: | |
603 | if (new_state == UNCONFIGURING) | |
604 | vscsi->state = new_state; | |
605 | break; | |
606 | ||
607 | /* | |
608 | * Can transition from this state to to unconfiguring | |
609 | * or err disconnect. | |
610 | */ | |
611 | case ERR_DISCONNECT_RECONNECT: | |
612 | switch (new_state) { | |
613 | case UNCONFIGURING: | |
614 | case ERR_DISCONNECT: | |
615 | vscsi->state = new_state; | |
616 | break; | |
617 | ||
618 | case WAIT_IDLE: | |
619 | break; | |
620 | default: | |
621 | break; | |
622 | } | |
623 | break; | |
624 | ||
625 | /* can transition from this state to UNCONFIGURING */ | |
626 | case ERR_DISCONNECTED: | |
627 | if (new_state == UNCONFIGURING) | |
628 | vscsi->state = new_state; | |
629 | break; | |
630 | ||
631 | /* | |
632 | * If this is a transition into an error state. | |
633 | * a client is attempting to establish a connection | |
634 | * and has violated the RPA protocol. | |
635 | * There can be nothing pending on the adapter although | |
636 | * there can be requests in the command queue. | |
637 | */ | |
638 | case WAIT_ENABLED: | |
639 | case PART_UP_WAIT_ENAB: | |
640 | switch (new_state) { | |
641 | case ERR_DISCONNECT: | |
642 | vscsi->flags |= RESPONSE_Q_DOWN; | |
643 | vscsi->state = new_state; | |
644 | vscsi->flags &= ~(SCHEDULE_DISCONNECT | | |
645 | DISCONNECT_SCHEDULED); | |
646 | ibmvscsis_free_command_q(vscsi); | |
647 | break; | |
648 | case ERR_DISCONNECT_RECONNECT: | |
649 | ibmvscsis_reset_queue(vscsi, WAIT_ENABLED); | |
650 | break; | |
651 | ||
652 | /* should never happen */ | |
653 | case WAIT_IDLE: | |
654 | rc = ERROR; | |
655 | dev_err(&vscsi->dev, "disconnect: invalid state %d for WAIT_IDLE\n", | |
656 | vscsi->state); | |
657 | break; | |
658 | } | |
659 | break; | |
660 | ||
661 | case WAIT_IDLE: | |
662 | switch (new_state) { | |
663 | case ERR_DISCONNECT: | |
664 | case ERR_DISCONNECT_RECONNECT: | |
665 | vscsi->state = new_state; | |
666 | break; | |
667 | } | |
668 | break; | |
669 | ||
670 | /* | |
671 | * Initiator has not done a successful srp login | |
672 | * or has done a successful srp logout ( adapter was not | |
673 | * busy). In the first case there can be responses queued | |
674 | * waiting for space on the initiators response queue (MAD) | |
675 | * The second case the adapter is idle. Assume the worse case, | |
676 | * i.e. the second case. | |
677 | */ | |
678 | case WAIT_CONNECTION: | |
679 | case CONNECTED: | |
680 | case SRP_PROCESSING: | |
681 | wait_idle = true; | |
682 | vscsi->state = new_state; | |
683 | break; | |
684 | ||
685 | /* can transition from this state to UNCONFIGURING */ | |
686 | case UNDEFINED: | |
687 | if (new_state == UNCONFIGURING) | |
688 | vscsi->state = new_state; | |
689 | break; | |
690 | default: | |
691 | break; | |
692 | } | |
693 | ||
694 | if (wait_idle) { | |
695 | pr_debug("disconnect start wait, active %d, sched %d\n", | |
696 | (int)list_empty(&vscsi->active_q), | |
697 | (int)list_empty(&vscsi->schedule_q)); | |
698 | if (!list_empty(&vscsi->active_q) || | |
699 | !list_empty(&vscsi->schedule_q)) { | |
700 | vscsi->flags |= WAIT_FOR_IDLE; | |
701 | pr_debug("disconnect flags 0x%x\n", vscsi->flags); | |
702 | /* | |
703 | * This routine is can not be called with the interrupt | |
704 | * lock held. | |
705 | */ | |
706 | spin_unlock_bh(&vscsi->intr_lock); | |
707 | wait_for_completion(&vscsi->wait_idle); | |
708 | spin_lock_bh(&vscsi->intr_lock); | |
709 | } | |
710 | pr_debug("disconnect stop wait\n"); | |
711 | ||
712 | ibmvscsis_adapter_idle(vscsi); | |
713 | } | |
714 | ||
715 | spin_unlock_bh(&vscsi->intr_lock); | |
716 | } | |
717 | ||
718 | /** | |
719 | * ibmvscsis_post_disconnect() - Schedule the disconnect | |
720 | * @vscsi: Pointer to our adapter structure | |
721 | * @new_state: State to move to after disconnecting | |
722 | * @flag_bits: Flags to turn on in adapter structure | |
723 | * | |
724 | * If it's already been scheduled, then see if we need to "upgrade" | |
725 | * the new state (if the one passed in is more "severe" than the | |
726 | * previous one). | |
727 | * | |
728 | * PRECONDITION: | |
729 | * interrupt lock is held | |
730 | */ | |
731 | static void ibmvscsis_post_disconnect(struct scsi_info *vscsi, uint new_state, | |
732 | uint flag_bits) | |
733 | { | |
734 | uint state; | |
735 | ||
736 | /* check the validity of the new state */ | |
737 | switch (new_state) { | |
738 | case UNCONFIGURING: | |
739 | case ERR_DISCONNECT: | |
740 | case ERR_DISCONNECT_RECONNECT: | |
741 | case WAIT_IDLE: | |
742 | break; | |
743 | ||
744 | default: | |
745 | dev_err(&vscsi->dev, "post_disconnect: Invalid new state %d\n", | |
746 | new_state); | |
747 | return; | |
748 | } | |
749 | ||
750 | vscsi->flags |= flag_bits; | |
751 | ||
752 | pr_debug("post_disconnect: new_state 0x%x, flag_bits 0x%x, vscsi->flags 0x%x, state %hx\n", | |
753 | new_state, flag_bits, vscsi->flags, vscsi->state); | |
754 | ||
755 | if (!(vscsi->flags & (DISCONNECT_SCHEDULED | SCHEDULE_DISCONNECT))) { | |
756 | vscsi->flags |= SCHEDULE_DISCONNECT; | |
757 | vscsi->new_state = new_state; | |
758 | ||
759 | INIT_WORK(&vscsi->proc_work, ibmvscsis_disconnect); | |
760 | (void)queue_work(vscsi->work_q, &vscsi->proc_work); | |
761 | } else { | |
762 | if (vscsi->new_state) | |
763 | state = vscsi->new_state; | |
764 | else | |
765 | state = vscsi->state; | |
766 | ||
767 | switch (state) { | |
768 | case NO_QUEUE: | |
769 | case UNCONFIGURING: | |
770 | break; | |
771 | ||
772 | case ERR_DISCONNECTED: | |
773 | case ERR_DISCONNECT: | |
774 | case UNDEFINED: | |
775 | if (new_state == UNCONFIGURING) | |
776 | vscsi->new_state = new_state; | |
777 | break; | |
778 | ||
779 | case ERR_DISCONNECT_RECONNECT: | |
780 | switch (new_state) { | |
781 | case UNCONFIGURING: | |
782 | case ERR_DISCONNECT: | |
783 | vscsi->new_state = new_state; | |
784 | break; | |
785 | default: | |
786 | break; | |
787 | } | |
788 | break; | |
789 | ||
790 | case WAIT_ENABLED: | |
791 | case PART_UP_WAIT_ENAB: | |
792 | case WAIT_IDLE: | |
793 | case WAIT_CONNECTION: | |
794 | case CONNECTED: | |
795 | case SRP_PROCESSING: | |
796 | vscsi->new_state = new_state; | |
797 | break; | |
798 | ||
799 | default: | |
800 | break; | |
801 | } | |
802 | } | |
803 | ||
804 | pr_debug("Leaving post_disconnect: flags 0x%x, new_state 0x%x\n", | |
805 | vscsi->flags, vscsi->new_state); | |
806 | } | |
807 | ||
808 | /** | |
809 | * ibmvscsis_trans_event() - Handle a Transport Event | |
810 | * @vscsi: Pointer to our adapter structure | |
811 | * @crq: Pointer to CRQ entry containing the Transport Event | |
812 | * | |
813 | * Do the logic to close the I_T nexus. This function may not | |
814 | * behave to specification. | |
815 | * | |
816 | * EXECUTION ENVIRONMENT: | |
817 | * Interrupt, interrupt lock held | |
818 | */ | |
819 | static long ibmvscsis_trans_event(struct scsi_info *vscsi, | |
820 | struct viosrp_crq *crq) | |
821 | { | |
822 | long rc = ADAPT_SUCCESS; | |
823 | ||
824 | pr_debug("trans_event: format %d, flags 0x%x, state 0x%hx\n", | |
825 | (int)crq->format, vscsi->flags, vscsi->state); | |
826 | ||
827 | switch (crq->format) { | |
828 | case MIGRATED: | |
829 | case PARTNER_FAILED: | |
830 | case PARTNER_DEREGISTER: | |
831 | ibmvscsis_delete_client_info(vscsi, true); | |
832 | break; | |
833 | ||
834 | default: | |
835 | rc = ERROR; | |
836 | dev_err(&vscsi->dev, "trans_event: invalid format %d\n", | |
837 | (uint)crq->format); | |
838 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, | |
839 | RESPONSE_Q_DOWN); | |
840 | break; | |
841 | } | |
842 | ||
843 | if (rc == ADAPT_SUCCESS) { | |
844 | switch (vscsi->state) { | |
845 | case NO_QUEUE: | |
846 | case ERR_DISCONNECTED: | |
847 | case UNDEFINED: | |
848 | break; | |
849 | ||
850 | case UNCONFIGURING: | |
851 | vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT); | |
852 | break; | |
853 | ||
854 | case WAIT_ENABLED: | |
855 | break; | |
856 | ||
857 | case WAIT_CONNECTION: | |
858 | break; | |
859 | ||
860 | case CONNECTED: | |
861 | ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, | |
862 | (RESPONSE_Q_DOWN | | |
863 | TRANS_EVENT)); | |
864 | break; | |
865 | ||
866 | case PART_UP_WAIT_ENAB: | |
867 | vscsi->state = WAIT_ENABLED; | |
868 | break; | |
869 | ||
870 | case SRP_PROCESSING: | |
871 | if ((vscsi->debit > 0) || | |
872 | !list_empty(&vscsi->schedule_q) || | |
873 | !list_empty(&vscsi->waiting_rsp) || | |
874 | !list_empty(&vscsi->active_q)) { | |
875 | pr_debug("debit %d, sched %d, wait %d, active %d\n", | |
876 | vscsi->debit, | |
877 | (int)list_empty(&vscsi->schedule_q), | |
878 | (int)list_empty(&vscsi->waiting_rsp), | |
879 | (int)list_empty(&vscsi->active_q)); | |
880 | pr_warn("connection lost with outstanding work\n"); | |
881 | } else { | |
882 | pr_debug("trans_event: SRP Processing, but no outstanding work\n"); | |
883 | } | |
884 | ||
885 | ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, | |
886 | (RESPONSE_Q_DOWN | | |
887 | TRANS_EVENT)); | |
888 | break; | |
889 | ||
890 | case ERR_DISCONNECT: | |
891 | case ERR_DISCONNECT_RECONNECT: | |
892 | case WAIT_IDLE: | |
893 | vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT); | |
894 | break; | |
895 | } | |
896 | } | |
897 | ||
898 | rc = vscsi->flags & SCHEDULE_DISCONNECT; | |
899 | ||
900 | pr_debug("Leaving trans_event: flags 0x%x, state 0x%hx, rc %ld\n", | |
901 | vscsi->flags, vscsi->state, rc); | |
902 | ||
903 | return rc; | |
904 | } | |
905 | ||
906 | /** | |
907 | * ibmvscsis_poll_cmd_q() - Poll Command Queue | |
908 | * @vscsi: Pointer to our adapter structure | |
909 | * | |
910 | * Called to handle command elements that may have arrived while | |
911 | * interrupts were disabled. | |
912 | * | |
913 | * EXECUTION ENVIRONMENT: | |
914 | * intr_lock must be held | |
915 | */ | |
916 | static void ibmvscsis_poll_cmd_q(struct scsi_info *vscsi) | |
917 | { | |
918 | struct viosrp_crq *crq; | |
919 | long rc; | |
920 | bool ack = true; | |
921 | volatile u8 valid; | |
922 | ||
923 | pr_debug("poll_cmd_q: flags 0x%x, state 0x%hx, q index %ud\n", | |
924 | vscsi->flags, vscsi->state, vscsi->cmd_q.index); | |
925 | ||
926 | rc = vscsi->flags & SCHEDULE_DISCONNECT; | |
927 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
928 | valid = crq->valid; | |
929 | dma_rmb(); | |
930 | ||
931 | while (valid) { | |
932 | poll_work: | |
933 | vscsi->cmd_q.index = | |
934 | (vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask; | |
935 | ||
936 | if (!rc) { | |
937 | rc = ibmvscsis_parse_command(vscsi, crq); | |
938 | } else { | |
939 | if ((uint)crq->valid == VALID_TRANS_EVENT) { | |
940 | /* | |
941 | * must service the transport layer events even | |
942 | * in an error state, dont break out until all | |
943 | * the consecutive transport events have been | |
944 | * processed | |
945 | */ | |
946 | rc = ibmvscsis_trans_event(vscsi, crq); | |
947 | } else if (vscsi->flags & TRANS_EVENT) { | |
948 | /* | |
949 | * if a tranport event has occurred leave | |
950 | * everything but transport events on the queue | |
951 | */ | |
952 | pr_debug("poll_cmd_q, ignoring\n"); | |
953 | ||
954 | /* | |
955 | * need to decrement the queue index so we can | |
956 | * look at the elment again | |
957 | */ | |
958 | if (vscsi->cmd_q.index) | |
959 | vscsi->cmd_q.index -= 1; | |
960 | else | |
961 | /* | |
962 | * index is at 0 it just wrapped. | |
963 | * have it index last element in q | |
964 | */ | |
965 | vscsi->cmd_q.index = vscsi->cmd_q.mask; | |
966 | break; | |
967 | } | |
968 | } | |
969 | ||
970 | crq->valid = INVALIDATE_CMD_RESP_EL; | |
971 | ||
972 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
973 | valid = crq->valid; | |
974 | dma_rmb(); | |
975 | } | |
976 | ||
977 | if (!rc) { | |
978 | if (ack) { | |
979 | vio_enable_interrupts(vscsi->dma_dev); | |
980 | ack = false; | |
981 | pr_debug("poll_cmd_q, reenabling interrupts\n"); | |
982 | } | |
983 | valid = crq->valid; | |
984 | dma_rmb(); | |
985 | if (valid) | |
986 | goto poll_work; | |
987 | } | |
988 | ||
989 | pr_debug("Leaving poll_cmd_q: rc %ld\n", rc); | |
990 | } | |
991 | ||
992 | /** | |
993 | * ibmvscsis_free_cmd_qs() - Free elements in queue | |
994 | * @vscsi: Pointer to our adapter structure | |
995 | * | |
996 | * Free all of the elements on all queues that are waiting for | |
997 | * whatever reason. | |
998 | * | |
999 | * PRECONDITION: | |
1000 | * Called with interrupt lock held | |
1001 | */ | |
1002 | static void ibmvscsis_free_cmd_qs(struct scsi_info *vscsi) | |
1003 | { | |
1004 | struct ibmvscsis_cmd *cmd, *nxt; | |
1005 | ||
1006 | pr_debug("free_cmd_qs: waiting_rsp empty %d, timer starter %d\n", | |
1007 | (int)list_empty(&vscsi->waiting_rsp), | |
1008 | vscsi->rsp_q_timer.started); | |
1009 | ||
1010 | list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp, list) { | |
1011 | list_del(&cmd->list); | |
1012 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | /** | |
1017 | * ibmvscsis_get_free_cmd() - Get free command from list | |
1018 | * @vscsi: Pointer to our adapter structure | |
1019 | * | |
1020 | * Must be called with interrupt lock held. | |
1021 | */ | |
1022 | static struct ibmvscsis_cmd *ibmvscsis_get_free_cmd(struct scsi_info *vscsi) | |
1023 | { | |
1024 | struct ibmvscsis_cmd *cmd = NULL; | |
1025 | struct iu_entry *iue; | |
1026 | ||
1027 | iue = srp_iu_get(&vscsi->target); | |
1028 | if (iue) { | |
1029 | cmd = list_first_entry_or_null(&vscsi->free_cmd, | |
1030 | struct ibmvscsis_cmd, list); | |
1031 | if (cmd) { | |
1032 | list_del(&cmd->list); | |
1033 | cmd->iue = iue; | |
1034 | cmd->type = UNSET_TYPE; | |
1035 | memset(&cmd->se_cmd, 0, sizeof(cmd->se_cmd)); | |
1036 | } else { | |
1037 | srp_iu_put(iue); | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | return cmd; | |
1042 | } | |
1043 | ||
1044 | /** | |
1045 | * ibmvscsis_adapter_idle() - Helper function to handle idle adapter | |
1046 | * @vscsi: Pointer to our adapter structure | |
1047 | * | |
1048 | * This function is called when the adapter is idle when the driver | |
1049 | * is attempting to clear an error condition. | |
1050 | * The adapter is considered busy if any of its cmd queues | |
1051 | * are non-empty. This function can be invoked | |
1052 | * from the off level disconnect function. | |
1053 | * | |
1054 | * EXECUTION ENVIRONMENT: | |
1055 | * Process environment called with interrupt lock held | |
1056 | */ | |
1057 | static void ibmvscsis_adapter_idle(struct scsi_info *vscsi) | |
1058 | { | |
1059 | int free_qs = false; | |
1060 | ||
1061 | pr_debug("adapter_idle: flags 0x%x, state 0x%hx\n", vscsi->flags, | |
1062 | vscsi->state); | |
1063 | ||
1064 | /* Only need to free qs if we're disconnecting from client */ | |
1065 | if (vscsi->state != WAIT_CONNECTION || vscsi->flags & TRANS_EVENT) | |
1066 | free_qs = true; | |
1067 | ||
1068 | switch (vscsi->state) { | |
1069 | case ERR_DISCONNECT_RECONNECT: | |
1070 | ibmvscsis_reset_queue(vscsi, WAIT_CONNECTION); | |
1071 | pr_debug("adapter_idle, disc_rec: flags 0x%x\n", vscsi->flags); | |
1072 | break; | |
1073 | ||
1074 | case ERR_DISCONNECT: | |
1075 | ibmvscsis_free_command_q(vscsi); | |
1076 | vscsi->flags &= ~DISCONNECT_SCHEDULED; | |
1077 | vscsi->flags |= RESPONSE_Q_DOWN; | |
1078 | vscsi->state = ERR_DISCONNECTED; | |
1079 | pr_debug("adapter_idle, disc: flags 0x%x, state 0x%hx\n", | |
1080 | vscsi->flags, vscsi->state); | |
1081 | break; | |
1082 | ||
1083 | case WAIT_IDLE: | |
1084 | vscsi->rsp_q_timer.timer_pops = 0; | |
1085 | vscsi->debit = 0; | |
1086 | vscsi->credit = 0; | |
1087 | if (vscsi->flags & TRANS_EVENT) { | |
1088 | vscsi->state = WAIT_CONNECTION; | |
1089 | vscsi->flags &= PRESERVE_FLAG_FIELDS; | |
1090 | } else { | |
1091 | vscsi->state = CONNECTED; | |
1092 | vscsi->flags &= ~DISCONNECT_SCHEDULED; | |
1093 | } | |
1094 | ||
1095 | pr_debug("adapter_idle, wait: flags 0x%x, state 0x%hx\n", | |
1096 | vscsi->flags, vscsi->state); | |
1097 | ibmvscsis_poll_cmd_q(vscsi); | |
1098 | break; | |
1099 | ||
1100 | case ERR_DISCONNECTED: | |
1101 | vscsi->flags &= ~DISCONNECT_SCHEDULED; | |
1102 | pr_debug("adapter_idle, disconnected: flags 0x%x, state 0x%hx\n", | |
1103 | vscsi->flags, vscsi->state); | |
1104 | break; | |
1105 | ||
1106 | default: | |
1107 | dev_err(&vscsi->dev, "adapter_idle: in invalid state %d\n", | |
1108 | vscsi->state); | |
1109 | break; | |
1110 | } | |
1111 | ||
1112 | if (free_qs) | |
1113 | ibmvscsis_free_cmd_qs(vscsi); | |
1114 | ||
1115 | /* | |
1116 | * There is a timing window where we could lose a disconnect request. | |
1117 | * The known path to this window occurs during the DISCONNECT_RECONNECT | |
1118 | * case above: reset_queue calls free_command_q, which will release the | |
1119 | * interrupt lock. During that time, a new post_disconnect call can be | |
1120 | * made with a "more severe" state (DISCONNECT or UNCONFIGURING). | |
1121 | * Because the DISCONNECT_SCHEDULED flag is already set, post_disconnect | |
1122 | * will only set the new_state. Now free_command_q reacquires the intr | |
1123 | * lock and clears the DISCONNECT_SCHEDULED flag (using PRESERVE_FLAG_ | |
1124 | * FIELDS), and the disconnect is lost. This is particularly bad when | |
1125 | * the new disconnect was for UNCONFIGURING, since the unconfigure hangs | |
1126 | * forever. | |
1127 | * Fix is that free command queue sets acr state and acr flags if there | |
1128 | * is a change under the lock | |
1129 | * note free command queue writes to this state it clears it | |
1130 | * before releasing the lock, different drivers call the free command | |
1131 | * queue different times so dont initialize above | |
1132 | */ | |
1133 | if (vscsi->phyp_acr_state != 0) { | |
1134 | /* | |
1135 | * set any bits in flags that may have been cleared by | |
1136 | * a call to free command queue in switch statement | |
1137 | * or reset queue | |
1138 | */ | |
1139 | vscsi->flags |= vscsi->phyp_acr_flags; | |
1140 | ibmvscsis_post_disconnect(vscsi, vscsi->phyp_acr_state, 0); | |
1141 | vscsi->phyp_acr_state = 0; | |
1142 | vscsi->phyp_acr_flags = 0; | |
1143 | ||
1144 | pr_debug("adapter_idle: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n", | |
1145 | vscsi->flags, vscsi->state, vscsi->phyp_acr_flags, | |
1146 | vscsi->phyp_acr_state); | |
1147 | } | |
1148 | ||
1149 | pr_debug("Leaving adapter_idle: flags 0x%x, state 0x%hx, new_state 0x%x\n", | |
1150 | vscsi->flags, vscsi->state, vscsi->new_state); | |
1151 | } | |
1152 | ||
1153 | /** | |
1154 | * ibmvscsis_copy_crq_packet() - Copy CRQ Packet | |
1155 | * @vscsi: Pointer to our adapter structure | |
1156 | * @cmd: Pointer to command element to use to process the request | |
1157 | * @crq: Pointer to CRQ entry containing the request | |
1158 | * | |
1159 | * Copy the srp information unit from the hosted | |
1160 | * partition using remote dma | |
1161 | * | |
1162 | * EXECUTION ENVIRONMENT: | |
1163 | * Interrupt, interrupt lock held | |
1164 | */ | |
1165 | static long ibmvscsis_copy_crq_packet(struct scsi_info *vscsi, | |
1166 | struct ibmvscsis_cmd *cmd, | |
1167 | struct viosrp_crq *crq) | |
1168 | { | |
1169 | struct iu_entry *iue = cmd->iue; | |
1170 | long rc = 0; | |
1171 | u16 len; | |
1172 | ||
1173 | len = be16_to_cpu(crq->IU_length); | |
1174 | if ((len > SRP_MAX_IU_LEN) || (len == 0)) { | |
1175 | dev_err(&vscsi->dev, "copy_crq: Invalid len %d passed", len); | |
1176 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
1177 | return SRP_VIOLATION; | |
1178 | } | |
1179 | ||
1180 | rc = h_copy_rdma(len, vscsi->dds.window[REMOTE].liobn, | |
1181 | be64_to_cpu(crq->IU_data_ptr), | |
1182 | vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma); | |
1183 | ||
1184 | switch (rc) { | |
1185 | case H_SUCCESS: | |
1186 | cmd->init_time = mftb(); | |
1187 | iue->remote_token = crq->IU_data_ptr; | |
1188 | iue->iu_len = len; | |
1189 | pr_debug("copy_crq: ioba 0x%llx, init_time 0x%llx\n", | |
1190 | be64_to_cpu(crq->IU_data_ptr), cmd->init_time); | |
1191 | break; | |
1192 | case H_PERMISSION: | |
1193 | if (connection_broken(vscsi)) | |
1194 | ibmvscsis_post_disconnect(vscsi, | |
1195 | ERR_DISCONNECT_RECONNECT, | |
1196 | (RESPONSE_Q_DOWN | | |
1197 | CLIENT_FAILED)); | |
1198 | else | |
1199 | ibmvscsis_post_disconnect(vscsi, | |
1200 | ERR_DISCONNECT_RECONNECT, 0); | |
1201 | ||
1202 | dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n", | |
1203 | rc); | |
1204 | break; | |
1205 | case H_DEST_PARM: | |
1206 | case H_SOURCE_PARM: | |
1207 | default: | |
1208 | dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n", | |
1209 | rc); | |
1210 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
1211 | break; | |
1212 | } | |
1213 | ||
1214 | return rc; | |
1215 | } | |
1216 | ||
1217 | /** | |
1218 | * ibmvscsis_adapter_info - Service an Adapter Info MAnagement Data gram | |
1219 | * @vscsi: Pointer to our adapter structure | |
1220 | * @iue: Information Unit containing the Adapter Info MAD request | |
1221 | * | |
1222 | * EXECUTION ENVIRONMENT: | |
1223 | * Interrupt adpater lock is held | |
1224 | */ | |
1225 | static long ibmvscsis_adapter_info(struct scsi_info *vscsi, | |
1226 | struct iu_entry *iue) | |
1227 | { | |
1228 | struct viosrp_adapter_info *mad = &vio_iu(iue)->mad.adapter_info; | |
1229 | struct mad_adapter_info_data *info; | |
1230 | uint flag_bits = 0; | |
1231 | dma_addr_t token; | |
1232 | long rc; | |
1233 | ||
1234 | mad->common.status = cpu_to_be16(VIOSRP_MAD_SUCCESS); | |
1235 | ||
1236 | if (be16_to_cpu(mad->common.length) > sizeof(*info)) { | |
1237 | mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1238 | return 0; | |
1239 | } | |
1240 | ||
1241 | info = dma_alloc_coherent(&vscsi->dma_dev->dev, sizeof(*info), &token, | |
1242 | GFP_KERNEL); | |
1243 | if (!info) { | |
1244 | dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n", | |
1245 | iue->target); | |
1246 | mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1247 | return 0; | |
1248 | } | |
1249 | ||
1250 | /* Get remote info */ | |
1251 | rc = h_copy_rdma(be16_to_cpu(mad->common.length), | |
1252 | vscsi->dds.window[REMOTE].liobn, | |
1253 | be64_to_cpu(mad->buffer), | |
1254 | vscsi->dds.window[LOCAL].liobn, token); | |
1255 | ||
1256 | if (rc != H_SUCCESS) { | |
1257 | if (rc == H_PERMISSION) { | |
1258 | if (connection_broken(vscsi)) | |
1259 | flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED); | |
1260 | } | |
1261 | pr_warn("adapter_info: h_copy_rdma from client failed, rc %ld\n", | |
1262 | rc); | |
1263 | pr_debug("adapter_info: ioba 0x%llx, flags 0x%x, flag_bits 0x%x\n", | |
1264 | be64_to_cpu(mad->buffer), vscsi->flags, flag_bits); | |
1265 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, | |
1266 | flag_bits); | |
1267 | goto free_dma; | |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * Copy client info, but ignore partition number, which we | |
1272 | * already got from phyp - unless we failed to get it from | |
1273 | * phyp (e.g. if we're running on a p5 system). | |
1274 | */ | |
1275 | if (vscsi->client_data.partition_number == 0) | |
1276 | vscsi->client_data.partition_number = | |
1277 | be32_to_cpu(info->partition_number); | |
1278 | strncpy(vscsi->client_data.srp_version, info->srp_version, | |
1279 | sizeof(vscsi->client_data.srp_version)); | |
1280 | strncpy(vscsi->client_data.partition_name, info->partition_name, | |
1281 | sizeof(vscsi->client_data.partition_name)); | |
1282 | vscsi->client_data.mad_version = be32_to_cpu(info->mad_version); | |
1283 | vscsi->client_data.os_type = be32_to_cpu(info->os_type); | |
1284 | ||
1285 | /* Copy our info */ | |
1286 | strncpy(info->srp_version, SRP_VERSION, | |
1287 | sizeof(info->srp_version)); | |
1288 | strncpy(info->partition_name, vscsi->dds.partition_name, | |
1289 | sizeof(info->partition_name)); | |
1290 | info->partition_number = cpu_to_be32(vscsi->dds.partition_num); | |
1291 | info->mad_version = cpu_to_be32(MAD_VERSION_1); | |
1292 | info->os_type = cpu_to_be32(LINUX); | |
1293 | memset(&info->port_max_txu[0], 0, sizeof(info->port_max_txu)); | |
1294 | info->port_max_txu[0] = cpu_to_be32(128 * PAGE_SIZE); | |
1295 | ||
1296 | dma_wmb(); | |
1297 | rc = h_copy_rdma(sizeof(*info), vscsi->dds.window[LOCAL].liobn, | |
1298 | token, vscsi->dds.window[REMOTE].liobn, | |
1299 | be64_to_cpu(mad->buffer)); | |
1300 | switch (rc) { | |
1301 | case H_SUCCESS: | |
1302 | break; | |
1303 | ||
1304 | case H_SOURCE_PARM: | |
1305 | case H_DEST_PARM: | |
1306 | case H_PERMISSION: | |
1307 | if (connection_broken(vscsi)) | |
1308 | flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED); | |
1309 | default: | |
1310 | dev_err(&vscsi->dev, "adapter_info: h_copy_rdma to client failed, rc %ld\n", | |
1311 | rc); | |
1312 | ibmvscsis_post_disconnect(vscsi, | |
1313 | ERR_DISCONNECT_RECONNECT, | |
1314 | flag_bits); | |
1315 | break; | |
1316 | } | |
1317 | ||
1318 | free_dma: | |
1319 | dma_free_coherent(&vscsi->dma_dev->dev, sizeof(*info), info, token); | |
1320 | pr_debug("Leaving adapter_info, rc %ld\n", rc); | |
1321 | ||
1322 | return rc; | |
1323 | } | |
1324 | ||
1325 | /** | |
1326 | * ibmvscsis_cap_mad() - Service a Capabilities MAnagement Data gram | |
1327 | * @vscsi: Pointer to our adapter structure | |
1328 | * @iue: Information Unit containing the Capabilities MAD request | |
1329 | * | |
1330 | * NOTE: if you return an error from this routine you must be | |
1331 | * disconnecting or you will cause a hang | |
1332 | * | |
1333 | * EXECUTION ENVIRONMENT: | |
1334 | * Interrupt called with adapter lock held | |
1335 | */ | |
1336 | static int ibmvscsis_cap_mad(struct scsi_info *vscsi, struct iu_entry *iue) | |
1337 | { | |
1338 | struct viosrp_capabilities *mad = &vio_iu(iue)->mad.capabilities; | |
1339 | struct capabilities *cap; | |
1340 | struct mad_capability_common *common; | |
1341 | dma_addr_t token; | |
1342 | u16 olen, len, status, min_len, cap_len; | |
1343 | u32 flag; | |
1344 | uint flag_bits = 0; | |
1345 | long rc = 0; | |
1346 | ||
1347 | olen = be16_to_cpu(mad->common.length); | |
1348 | /* | |
1349 | * struct capabilities hardcodes a couple capabilities after the | |
1350 | * header, but the capabilities can actually be in any order. | |
1351 | */ | |
1352 | min_len = offsetof(struct capabilities, migration); | |
1353 | if ((olen < min_len) || (olen > PAGE_SIZE)) { | |
1354 | pr_warn("cap_mad: invalid len %d\n", olen); | |
1355 | mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1356 | return 0; | |
1357 | } | |
1358 | ||
1359 | cap = dma_alloc_coherent(&vscsi->dma_dev->dev, olen, &token, | |
1360 | GFP_KERNEL); | |
1361 | if (!cap) { | |
1362 | dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n", | |
1363 | iue->target); | |
1364 | mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1365 | return 0; | |
1366 | } | |
1367 | rc = h_copy_rdma(olen, vscsi->dds.window[REMOTE].liobn, | |
1368 | be64_to_cpu(mad->buffer), | |
1369 | vscsi->dds.window[LOCAL].liobn, token); | |
1370 | if (rc == H_SUCCESS) { | |
1371 | strncpy(cap->name, dev_name(&vscsi->dma_dev->dev), | |
1372 | SRP_MAX_LOC_LEN); | |
1373 | ||
1374 | len = olen - min_len; | |
1375 | status = VIOSRP_MAD_SUCCESS; | |
1376 | common = (struct mad_capability_common *)&cap->migration; | |
1377 | ||
1378 | while ((len > 0) && (status == VIOSRP_MAD_SUCCESS) && !rc) { | |
1379 | pr_debug("cap_mad: len left %hd, cap type %d, cap len %hd\n", | |
1380 | len, be32_to_cpu(common->cap_type), | |
1381 | be16_to_cpu(common->length)); | |
1382 | ||
1383 | cap_len = be16_to_cpu(common->length); | |
1384 | if (cap_len > len) { | |
1385 | dev_err(&vscsi->dev, "cap_mad: cap len mismatch with total len\n"); | |
1386 | status = VIOSRP_MAD_FAILED; | |
1387 | break; | |
1388 | } | |
1389 | ||
1390 | if (cap_len == 0) { | |
1391 | dev_err(&vscsi->dev, "cap_mad: cap len is 0\n"); | |
1392 | status = VIOSRP_MAD_FAILED; | |
1393 | break; | |
1394 | } | |
1395 | ||
1396 | switch (common->cap_type) { | |
1397 | default: | |
1398 | pr_debug("cap_mad: unsupported capability\n"); | |
1399 | common->server_support = 0; | |
1400 | flag = cpu_to_be32((u32)CAP_LIST_SUPPORTED); | |
1401 | cap->flags &= ~flag; | |
1402 | break; | |
1403 | } | |
1404 | ||
1405 | len = len - cap_len; | |
1406 | common = (struct mad_capability_common *) | |
1407 | ((char *)common + cap_len); | |
1408 | } | |
1409 | ||
1410 | mad->common.status = cpu_to_be16(status); | |
1411 | ||
1412 | dma_wmb(); | |
1413 | rc = h_copy_rdma(olen, vscsi->dds.window[LOCAL].liobn, token, | |
1414 | vscsi->dds.window[REMOTE].liobn, | |
1415 | be64_to_cpu(mad->buffer)); | |
1416 | ||
1417 | if (rc != H_SUCCESS) { | |
1418 | pr_debug("cap_mad: failed to copy to client, rc %ld\n", | |
1419 | rc); | |
1420 | ||
1421 | if (rc == H_PERMISSION) { | |
1422 | if (connection_broken(vscsi)) | |
1423 | flag_bits = (RESPONSE_Q_DOWN | | |
1424 | CLIENT_FAILED); | |
1425 | } | |
1426 | ||
1427 | pr_warn("cap_mad: error copying data to client, rc %ld\n", | |
1428 | rc); | |
1429 | ibmvscsis_post_disconnect(vscsi, | |
1430 | ERR_DISCONNECT_RECONNECT, | |
1431 | flag_bits); | |
1432 | } | |
1433 | } | |
1434 | ||
1435 | dma_free_coherent(&vscsi->dma_dev->dev, olen, cap, token); | |
1436 | ||
1437 | pr_debug("Leaving cap_mad, rc %ld, client_cap 0x%x\n", | |
1438 | rc, vscsi->client_cap); | |
1439 | ||
1440 | return rc; | |
1441 | } | |
1442 | ||
1443 | /** | |
1444 | * ibmvscsis_process_mad() - Service a MAnagement Data gram | |
1445 | * @vscsi: Pointer to our adapter structure | |
1446 | * @iue: Information Unit containing the MAD request | |
1447 | * | |
1448 | * Must be called with interrupt lock held. | |
1449 | */ | |
1450 | static long ibmvscsis_process_mad(struct scsi_info *vscsi, struct iu_entry *iue) | |
1451 | { | |
1452 | struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad; | |
1453 | struct viosrp_empty_iu *empty; | |
1454 | long rc = ADAPT_SUCCESS; | |
1455 | ||
1456 | switch (be32_to_cpu(mad->type)) { | |
1457 | case VIOSRP_EMPTY_IU_TYPE: | |
1458 | empty = &vio_iu(iue)->mad.empty_iu; | |
1459 | vscsi->empty_iu_id = be64_to_cpu(empty->buffer); | |
1460 | vscsi->empty_iu_tag = be64_to_cpu(empty->common.tag); | |
1461 | mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS); | |
1462 | break; | |
1463 | case VIOSRP_ADAPTER_INFO_TYPE: | |
1464 | rc = ibmvscsis_adapter_info(vscsi, iue); | |
1465 | break; | |
1466 | case VIOSRP_CAPABILITIES_TYPE: | |
1467 | rc = ibmvscsis_cap_mad(vscsi, iue); | |
1468 | break; | |
1469 | case VIOSRP_ENABLE_FAST_FAIL: | |
1470 | if (vscsi->state == CONNECTED) { | |
1471 | vscsi->fast_fail = true; | |
1472 | mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS); | |
1473 | } else { | |
1474 | pr_warn("fast fail mad sent after login\n"); | |
1475 | mad->status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1476 | } | |
1477 | break; | |
1478 | default: | |
1479 | mad->status = cpu_to_be16(VIOSRP_MAD_NOT_SUPPORTED); | |
1480 | break; | |
1481 | } | |
1482 | ||
1483 | return rc; | |
1484 | } | |
1485 | ||
1486 | /** | |
1487 | * srp_snd_msg_failed() - Handle an error when sending a response | |
1488 | * @vscsi: Pointer to our adapter structure | |
1489 | * @rc: The return code from the h_send_crq command | |
1490 | * | |
1491 | * Must be called with interrupt lock held. | |
1492 | */ | |
1493 | static void srp_snd_msg_failed(struct scsi_info *vscsi, long rc) | |
1494 | { | |
1495 | ktime_t kt; | |
1496 | ||
1497 | if (rc != H_DROPPED) { | |
1498 | ibmvscsis_free_cmd_qs(vscsi); | |
1499 | ||
1500 | if (rc == H_CLOSED) | |
1501 | vscsi->flags |= CLIENT_FAILED; | |
1502 | ||
1503 | /* don't flag the same problem multiple times */ | |
1504 | if (!(vscsi->flags & RESPONSE_Q_DOWN)) { | |
1505 | vscsi->flags |= RESPONSE_Q_DOWN; | |
1506 | if (!(vscsi->state & (ERR_DISCONNECT | | |
1507 | ERR_DISCONNECT_RECONNECT | | |
1508 | ERR_DISCONNECTED | UNDEFINED))) { | |
1509 | dev_err(&vscsi->dev, "snd_msg_failed: setting RESPONSE_Q_DOWN, state 0x%hx, flags 0x%x, rc %ld\n", | |
1510 | vscsi->state, vscsi->flags, rc); | |
1511 | } | |
1512 | ibmvscsis_post_disconnect(vscsi, | |
1513 | ERR_DISCONNECT_RECONNECT, 0); | |
1514 | } | |
1515 | return; | |
1516 | } | |
1517 | ||
1518 | /* | |
1519 | * The response queue is full. | |
1520 | * If the server is processing SRP requests, i.e. | |
1521 | * the client has successfully done an | |
1522 | * SRP_LOGIN, then it will wait forever for room in | |
1523 | * the queue. However if the system admin | |
1524 | * is attempting to unconfigure the server then one | |
1525 | * or more children will be in a state where | |
1526 | * they are being removed. So if there is even one | |
1527 | * child being removed then the driver assumes | |
1528 | * the system admin is attempting to break the | |
1529 | * connection with the client and MAX_TIMER_POPS | |
1530 | * is honored. | |
1531 | */ | |
1532 | if ((vscsi->rsp_q_timer.timer_pops < MAX_TIMER_POPS) || | |
1533 | (vscsi->state == SRP_PROCESSING)) { | |
1534 | pr_debug("snd_msg_failed: response queue full, flags 0x%x, timer started %d, pops %d\n", | |
1535 | vscsi->flags, (int)vscsi->rsp_q_timer.started, | |
1536 | vscsi->rsp_q_timer.timer_pops); | |
1537 | ||
1538 | /* | |
1539 | * Check if the timer is running; if it | |
1540 | * is not then start it up. | |
1541 | */ | |
1542 | if (!vscsi->rsp_q_timer.started) { | |
1543 | if (vscsi->rsp_q_timer.timer_pops < | |
1544 | MAX_TIMER_POPS) { | |
1545 | kt = ktime_set(0, WAIT_NANO_SECONDS); | |
1546 | } else { | |
1547 | /* | |
1548 | * slide the timeslice if the maximum | |
1549 | * timer pops have already happened | |
1550 | */ | |
1551 | kt = ktime_set(WAIT_SECONDS, 0); | |
1552 | } | |
1553 | ||
1554 | vscsi->rsp_q_timer.started = true; | |
1555 | hrtimer_start(&vscsi->rsp_q_timer.timer, kt, | |
1556 | HRTIMER_MODE_REL); | |
1557 | } | |
1558 | } else { | |
1559 | /* | |
1560 | * TBD: Do we need to worry about this? Need to get | |
1561 | * remove working. | |
1562 | */ | |
1563 | /* | |
1564 | * waited a long time and it appears the system admin | |
1565 | * is bring this driver down | |
1566 | */ | |
1567 | vscsi->flags |= RESPONSE_Q_DOWN; | |
1568 | ibmvscsis_free_cmd_qs(vscsi); | |
1569 | /* | |
1570 | * if the driver is already attempting to disconnect | |
1571 | * from the client and has already logged an error | |
1572 | * trace this event but don't put it in the error log | |
1573 | */ | |
1574 | if (!(vscsi->state & (ERR_DISCONNECT | | |
1575 | ERR_DISCONNECT_RECONNECT | | |
1576 | ERR_DISCONNECTED | UNDEFINED))) { | |
1577 | dev_err(&vscsi->dev, "client crq full too long\n"); | |
1578 | ibmvscsis_post_disconnect(vscsi, | |
1579 | ERR_DISCONNECT_RECONNECT, | |
1580 | 0); | |
1581 | } | |
1582 | } | |
1583 | } | |
1584 | ||
1585 | /** | |
1586 | * ibmvscsis_send_messages() - Send a Response | |
1587 | * @vscsi: Pointer to our adapter structure | |
1588 | * | |
1589 | * Send a response, first checking the waiting queue. Responses are | |
1590 | * sent in order they are received. If the response cannot be sent, | |
1591 | * because the client queue is full, it stays on the waiting queue. | |
1592 | * | |
1593 | * PRECONDITION: | |
1594 | * Called with interrupt lock held | |
1595 | */ | |
1596 | static void ibmvscsis_send_messages(struct scsi_info *vscsi) | |
1597 | { | |
1598 | u64 msg_hi = 0; | |
1599 | /* note do not attmempt to access the IU_data_ptr with this pointer | |
1600 | * it is not valid | |
1601 | */ | |
1602 | struct viosrp_crq *crq = (struct viosrp_crq *)&msg_hi; | |
1603 | struct ibmvscsis_cmd *cmd, *nxt; | |
1604 | struct iu_entry *iue; | |
1605 | long rc = ADAPT_SUCCESS; | |
1606 | ||
1607 | if (!(vscsi->flags & RESPONSE_Q_DOWN)) { | |
1608 | list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp, list) { | |
1609 | pr_debug("send_messages cmd %p\n", cmd); | |
1610 | ||
1611 | iue = cmd->iue; | |
1612 | ||
1613 | crq->valid = VALID_CMD_RESP_EL; | |
1614 | crq->format = cmd->rsp.format; | |
1615 | ||
1616 | if (cmd->flags & CMD_FAST_FAIL) | |
1617 | crq->status = VIOSRP_ADAPTER_FAIL; | |
1618 | ||
1619 | crq->IU_length = cpu_to_be16(cmd->rsp.len); | |
1620 | ||
1621 | rc = h_send_crq(vscsi->dma_dev->unit_address, | |
1622 | be64_to_cpu(msg_hi), | |
1623 | be64_to_cpu(cmd->rsp.tag)); | |
1624 | ||
1625 | pr_debug("send_messages: tag 0x%llx, rc %ld\n", | |
1626 | be64_to_cpu(cmd->rsp.tag), rc); | |
1627 | ||
1628 | /* if all ok free up the command element resources */ | |
1629 | if (rc == H_SUCCESS) { | |
1630 | /* some movement has occurred */ | |
1631 | vscsi->rsp_q_timer.timer_pops = 0; | |
1632 | list_del(&cmd->list); | |
1633 | ||
1634 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
1635 | } else { | |
1636 | srp_snd_msg_failed(vscsi, rc); | |
1637 | break; | |
1638 | } | |
1639 | } | |
1640 | ||
1641 | if (!rc) { | |
1642 | /* | |
1643 | * The timer could pop with the queue empty. If | |
1644 | * this happens, rc will always indicate a | |
1645 | * success; clear the pop count. | |
1646 | */ | |
1647 | vscsi->rsp_q_timer.timer_pops = 0; | |
1648 | } | |
1649 | } else { | |
1650 | ibmvscsis_free_cmd_qs(vscsi); | |
1651 | } | |
1652 | } | |
1653 | ||
1654 | /* Called with intr lock held */ | |
1655 | static void ibmvscsis_send_mad_resp(struct scsi_info *vscsi, | |
1656 | struct ibmvscsis_cmd *cmd, | |
1657 | struct viosrp_crq *crq) | |
1658 | { | |
1659 | struct iu_entry *iue = cmd->iue; | |
1660 | struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad; | |
1661 | uint flag_bits = 0; | |
1662 | long rc; | |
1663 | ||
1664 | dma_wmb(); | |
1665 | rc = h_copy_rdma(sizeof(struct mad_common), | |
1666 | vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma, | |
1667 | vscsi->dds.window[REMOTE].liobn, | |
1668 | be64_to_cpu(crq->IU_data_ptr)); | |
1669 | if (!rc) { | |
1670 | cmd->rsp.format = VIOSRP_MAD_FORMAT; | |
1671 | cmd->rsp.len = sizeof(struct mad_common); | |
1672 | cmd->rsp.tag = mad->tag; | |
1673 | list_add_tail(&cmd->list, &vscsi->waiting_rsp); | |
1674 | ibmvscsis_send_messages(vscsi); | |
1675 | } else { | |
1676 | pr_debug("Error sending mad response, rc %ld\n", rc); | |
1677 | if (rc == H_PERMISSION) { | |
1678 | if (connection_broken(vscsi)) | |
1679 | flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED); | |
1680 | } | |
1681 | dev_err(&vscsi->dev, "mad: failed to copy to client, rc %ld\n", | |
1682 | rc); | |
1683 | ||
1684 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
1685 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, | |
1686 | flag_bits); | |
1687 | } | |
1688 | } | |
1689 | ||
1690 | /** | |
1691 | * ibmvscsis_mad() - Service a MAnagement Data gram. | |
1692 | * @vscsi: Pointer to our adapter structure | |
1693 | * @crq: Pointer to the CRQ entry containing the MAD request | |
1694 | * | |
1695 | * EXECUTION ENVIRONMENT: | |
1696 | * Interrupt called with adapter lock held | |
1697 | */ | |
1698 | static long ibmvscsis_mad(struct scsi_info *vscsi, struct viosrp_crq *crq) | |
1699 | { | |
1700 | struct iu_entry *iue; | |
1701 | struct ibmvscsis_cmd *cmd; | |
1702 | struct mad_common *mad; | |
1703 | long rc = ADAPT_SUCCESS; | |
1704 | ||
1705 | switch (vscsi->state) { | |
1706 | /* | |
1707 | * We have not exchanged Init Msgs yet, so this MAD was sent | |
1708 | * before the last Transport Event; client will not be | |
1709 | * expecting a response. | |
1710 | */ | |
1711 | case WAIT_CONNECTION: | |
1712 | pr_debug("mad: in Wait Connection state, ignoring MAD, flags %d\n", | |
1713 | vscsi->flags); | |
1714 | return ADAPT_SUCCESS; | |
1715 | ||
1716 | case SRP_PROCESSING: | |
1717 | case CONNECTED: | |
1718 | break; | |
1719 | ||
1720 | /* | |
1721 | * We should never get here while we're in these states. | |
1722 | * Just log an error and get out. | |
1723 | */ | |
1724 | case UNCONFIGURING: | |
1725 | case WAIT_IDLE: | |
1726 | case ERR_DISCONNECT: | |
1727 | case ERR_DISCONNECT_RECONNECT: | |
1728 | default: | |
1729 | dev_err(&vscsi->dev, "mad: invalid adapter state %d for mad\n", | |
1730 | vscsi->state); | |
1731 | return ADAPT_SUCCESS; | |
1732 | } | |
1733 | ||
1734 | cmd = ibmvscsis_get_free_cmd(vscsi); | |
1735 | if (!cmd) { | |
1736 | dev_err(&vscsi->dev, "mad: failed to get cmd, debit %d\n", | |
1737 | vscsi->debit); | |
1738 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
1739 | return ERROR; | |
1740 | } | |
1741 | iue = cmd->iue; | |
1742 | cmd->type = ADAPTER_MAD; | |
1743 | ||
1744 | rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq); | |
1745 | if (!rc) { | |
1746 | mad = (struct mad_common *)&vio_iu(iue)->mad; | |
1747 | ||
1748 | pr_debug("mad: type %d\n", be32_to_cpu(mad->type)); | |
1749 | ||
1750 | if (be16_to_cpu(mad->length) < 0) { | |
1751 | dev_err(&vscsi->dev, "mad: length is < 0\n"); | |
1752 | ibmvscsis_post_disconnect(vscsi, | |
1753 | ERR_DISCONNECT_RECONNECT, 0); | |
1754 | rc = SRP_VIOLATION; | |
1755 | } else { | |
1756 | rc = ibmvscsis_process_mad(vscsi, iue); | |
1757 | } | |
1758 | ||
1759 | pr_debug("mad: status %hd, rc %ld\n", be16_to_cpu(mad->status), | |
1760 | rc); | |
1761 | ||
1762 | if (!rc) | |
1763 | ibmvscsis_send_mad_resp(vscsi, cmd, crq); | |
1764 | } else { | |
1765 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
1766 | } | |
1767 | ||
1768 | pr_debug("Leaving mad, rc %ld\n", rc); | |
1769 | return rc; | |
1770 | } | |
1771 | ||
1772 | /** | |
1773 | * ibmvscsis_login_rsp() - Create/copy a login response notice to the client | |
1774 | * @vscsi: Pointer to our adapter structure | |
1775 | * @cmd: Pointer to the command for the SRP Login request | |
1776 | * | |
1777 | * EXECUTION ENVIRONMENT: | |
1778 | * Interrupt, interrupt lock held | |
1779 | */ | |
1780 | static long ibmvscsis_login_rsp(struct scsi_info *vscsi, | |
1781 | struct ibmvscsis_cmd *cmd) | |
1782 | { | |
1783 | struct iu_entry *iue = cmd->iue; | |
1784 | struct srp_login_rsp *rsp = &vio_iu(iue)->srp.login_rsp; | |
1785 | struct format_code *fmt; | |
1786 | uint flag_bits = 0; | |
1787 | long rc = ADAPT_SUCCESS; | |
1788 | ||
1789 | memset(rsp, 0, sizeof(struct srp_login_rsp)); | |
1790 | ||
1791 | rsp->opcode = SRP_LOGIN_RSP; | |
1792 | rsp->req_lim_delta = cpu_to_be32(vscsi->request_limit); | |
1793 | rsp->tag = cmd->rsp.tag; | |
1794 | rsp->max_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN); | |
1795 | rsp->max_ti_iu_len = cpu_to_be32(SRP_MAX_IU_LEN); | |
1796 | fmt = (struct format_code *)&rsp->buf_fmt; | |
1797 | fmt->buffers = SUPPORTED_FORMATS; | |
1798 | vscsi->credit = 0; | |
1799 | ||
1800 | cmd->rsp.len = sizeof(struct srp_login_rsp); | |
1801 | ||
1802 | dma_wmb(); | |
1803 | rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn, | |
1804 | iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn, | |
1805 | be64_to_cpu(iue->remote_token)); | |
1806 | ||
1807 | switch (rc) { | |
1808 | case H_SUCCESS: | |
1809 | break; | |
1810 | ||
1811 | case H_PERMISSION: | |
1812 | if (connection_broken(vscsi)) | |
1813 | flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED; | |
1814 | dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n", | |
1815 | rc); | |
1816 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, | |
1817 | flag_bits); | |
1818 | break; | |
1819 | case H_SOURCE_PARM: | |
1820 | case H_DEST_PARM: | |
1821 | default: | |
1822 | dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n", | |
1823 | rc); | |
1824 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
1825 | break; | |
1826 | } | |
1827 | ||
1828 | return rc; | |
1829 | } | |
1830 | ||
1831 | /** | |
1832 | * ibmvscsis_srp_login_rej() - Create/copy a login rejection notice to client | |
1833 | * @vscsi: Pointer to our adapter structure | |
1834 | * @cmd: Pointer to the command for the SRP Login request | |
1835 | * @reason: The reason the SRP Login is being rejected, per SRP protocol | |
1836 | * | |
1837 | * EXECUTION ENVIRONMENT: | |
1838 | * Interrupt, interrupt lock held | |
1839 | */ | |
1840 | static long ibmvscsis_srp_login_rej(struct scsi_info *vscsi, | |
1841 | struct ibmvscsis_cmd *cmd, u32 reason) | |
1842 | { | |
1843 | struct iu_entry *iue = cmd->iue; | |
1844 | struct srp_login_rej *rej = &vio_iu(iue)->srp.login_rej; | |
1845 | struct format_code *fmt; | |
1846 | uint flag_bits = 0; | |
1847 | long rc = ADAPT_SUCCESS; | |
1848 | ||
1849 | memset(rej, 0, sizeof(*rej)); | |
1850 | ||
1851 | rej->opcode = SRP_LOGIN_REJ; | |
1852 | rej->reason = cpu_to_be32(reason); | |
1853 | rej->tag = cmd->rsp.tag; | |
1854 | fmt = (struct format_code *)&rej->buf_fmt; | |
1855 | fmt->buffers = SUPPORTED_FORMATS; | |
1856 | ||
1857 | cmd->rsp.len = sizeof(*rej); | |
1858 | ||
1859 | dma_wmb(); | |
1860 | rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn, | |
1861 | iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn, | |
1862 | be64_to_cpu(iue->remote_token)); | |
1863 | ||
1864 | switch (rc) { | |
1865 | case H_SUCCESS: | |
1866 | break; | |
1867 | case H_PERMISSION: | |
1868 | if (connection_broken(vscsi)) | |
1869 | flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED; | |
1870 | dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n", | |
1871 | rc); | |
1872 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, | |
1873 | flag_bits); | |
1874 | break; | |
1875 | case H_SOURCE_PARM: | |
1876 | case H_DEST_PARM: | |
1877 | default: | |
1878 | dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n", | |
1879 | rc); | |
1880 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
1881 | break; | |
1882 | } | |
1883 | ||
1884 | return rc; | |
1885 | } | |
1886 | ||
1887 | static int ibmvscsis_make_nexus(struct ibmvscsis_tport *tport) | |
1888 | { | |
1889 | char *name = tport->tport_name; | |
1890 | struct ibmvscsis_nexus *nexus; | |
1891 | int rc; | |
1892 | ||
1893 | if (tport->ibmv_nexus) { | |
1894 | pr_debug("tport->ibmv_nexus already exists\n"); | |
1895 | return 0; | |
1896 | } | |
1897 | ||
1898 | nexus = kzalloc(sizeof(*nexus), GFP_KERNEL); | |
1899 | if (!nexus) { | |
1900 | pr_err("Unable to allocate struct ibmvscsis_nexus\n"); | |
1901 | return -ENOMEM; | |
1902 | } | |
1903 | ||
1904 | nexus->se_sess = target_alloc_session(&tport->se_tpg, 0, 0, | |
1905 | TARGET_PROT_NORMAL, name, nexus, | |
1906 | NULL); | |
1907 | if (IS_ERR(nexus->se_sess)) { | |
1908 | rc = PTR_ERR(nexus->se_sess); | |
1909 | goto transport_init_fail; | |
1910 | } | |
1911 | ||
1912 | tport->ibmv_nexus = nexus; | |
1913 | ||
1914 | return 0; | |
1915 | ||
1916 | transport_init_fail: | |
1917 | kfree(nexus); | |
1918 | return rc; | |
1919 | } | |
1920 | ||
1921 | static int ibmvscsis_drop_nexus(struct ibmvscsis_tport *tport) | |
1922 | { | |
1923 | struct se_session *se_sess; | |
1924 | struct ibmvscsis_nexus *nexus; | |
1925 | ||
1926 | nexus = tport->ibmv_nexus; | |
1927 | if (!nexus) | |
1928 | return -ENODEV; | |
1929 | ||
1930 | se_sess = nexus->se_sess; | |
1931 | if (!se_sess) | |
1932 | return -ENODEV; | |
1933 | ||
1934 | /* | |
1935 | * Release the SCSI I_T Nexus to the emulated ibmvscsis Target Port | |
1936 | */ | |
712db3eb BL |
1937 | target_wait_for_sess_cmds(se_sess); |
1938 | transport_deregister_session_configfs(se_sess); | |
88a678bb BL |
1939 | transport_deregister_session(se_sess); |
1940 | tport->ibmv_nexus = NULL; | |
1941 | kfree(nexus); | |
1942 | ||
1943 | return 0; | |
1944 | } | |
1945 | ||
1946 | /** | |
1947 | * ibmvscsis_srp_login() - Process an SRP Login Request | |
1948 | * @vscsi: Pointer to our adapter structure | |
1949 | * @cmd: Command element to use to process the SRP Login request | |
1950 | * @crq: Pointer to CRQ entry containing the SRP Login request | |
1951 | * | |
1952 | * EXECUTION ENVIRONMENT: | |
1953 | * Interrupt, called with interrupt lock held | |
1954 | */ | |
1955 | static long ibmvscsis_srp_login(struct scsi_info *vscsi, | |
1956 | struct ibmvscsis_cmd *cmd, | |
1957 | struct viosrp_crq *crq) | |
1958 | { | |
1959 | struct iu_entry *iue = cmd->iue; | |
1960 | struct srp_login_req *req = &vio_iu(iue)->srp.login_req; | |
1961 | struct port_id { | |
1962 | __be64 id_extension; | |
1963 | __be64 io_guid; | |
1964 | } *iport, *tport; | |
1965 | struct format_code *fmt; | |
1966 | u32 reason = 0x0; | |
1967 | long rc = ADAPT_SUCCESS; | |
1968 | ||
1969 | iport = (struct port_id *)req->initiator_port_id; | |
1970 | tport = (struct port_id *)req->target_port_id; | |
1971 | fmt = (struct format_code *)&req->req_buf_fmt; | |
1972 | if (be32_to_cpu(req->req_it_iu_len) > SRP_MAX_IU_LEN) | |
1973 | reason = SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE; | |
1974 | else if (be32_to_cpu(req->req_it_iu_len) < 64) | |
1975 | reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL; | |
1976 | else if ((be64_to_cpu(iport->id_extension) > (MAX_NUM_PORTS - 1)) || | |
1977 | (be64_to_cpu(tport->id_extension) > (MAX_NUM_PORTS - 1))) | |
1978 | reason = SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL; | |
1979 | else if (req->req_flags & SRP_MULTICHAN_MULTI) | |
1980 | reason = SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED; | |
1981 | else if (fmt->buffers & (~SUPPORTED_FORMATS)) | |
1982 | reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT; | |
1983 | else if ((fmt->buffers | SUPPORTED_FORMATS) == 0) | |
1984 | reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT; | |
1985 | ||
1986 | if (vscsi->state == SRP_PROCESSING) | |
1987 | reason = SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED; | |
1988 | ||
1989 | rc = ibmvscsis_make_nexus(&vscsi->tport); | |
1990 | if (rc) | |
1991 | reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL; | |
1992 | ||
1993 | cmd->rsp.format = VIOSRP_SRP_FORMAT; | |
1994 | cmd->rsp.tag = req->tag; | |
1995 | ||
1996 | pr_debug("srp_login: reason 0x%x\n", reason); | |
1997 | ||
1998 | if (reason) | |
1999 | rc = ibmvscsis_srp_login_rej(vscsi, cmd, reason); | |
2000 | else | |
2001 | rc = ibmvscsis_login_rsp(vscsi, cmd); | |
2002 | ||
2003 | if (!rc) { | |
2004 | if (!reason) | |
2005 | vscsi->state = SRP_PROCESSING; | |
2006 | ||
2007 | list_add_tail(&cmd->list, &vscsi->waiting_rsp); | |
2008 | ibmvscsis_send_messages(vscsi); | |
2009 | } else { | |
2010 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2011 | } | |
2012 | ||
2013 | pr_debug("Leaving srp_login, rc %ld\n", rc); | |
2014 | return rc; | |
2015 | } | |
2016 | ||
2017 | /** | |
2018 | * ibmvscsis_srp_i_logout() - Helper Function to close I_T Nexus | |
2019 | * @vscsi: Pointer to our adapter structure | |
2020 | * @cmd: Command element to use to process the Implicit Logout request | |
2021 | * @crq: Pointer to CRQ entry containing the Implicit Logout request | |
2022 | * | |
2023 | * Do the logic to close the I_T nexus. This function may not | |
2024 | * behave to specification. | |
2025 | * | |
2026 | * EXECUTION ENVIRONMENT: | |
2027 | * Interrupt, interrupt lock held | |
2028 | */ | |
2029 | static long ibmvscsis_srp_i_logout(struct scsi_info *vscsi, | |
2030 | struct ibmvscsis_cmd *cmd, | |
2031 | struct viosrp_crq *crq) | |
2032 | { | |
2033 | struct iu_entry *iue = cmd->iue; | |
2034 | struct srp_i_logout *log_out = &vio_iu(iue)->srp.i_logout; | |
2035 | long rc = ADAPT_SUCCESS; | |
2036 | ||
2037 | if ((vscsi->debit > 0) || !list_empty(&vscsi->schedule_q) || | |
2038 | !list_empty(&vscsi->waiting_rsp)) { | |
2039 | dev_err(&vscsi->dev, "i_logout: outstanding work\n"); | |
2040 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); | |
2041 | } else { | |
2042 | cmd->rsp.format = SRP_FORMAT; | |
2043 | cmd->rsp.tag = log_out->tag; | |
2044 | cmd->rsp.len = sizeof(struct mad_common); | |
2045 | list_add_tail(&cmd->list, &vscsi->waiting_rsp); | |
2046 | ibmvscsis_send_messages(vscsi); | |
2047 | ||
2048 | ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0); | |
2049 | } | |
2050 | ||
2051 | return rc; | |
2052 | } | |
2053 | ||
2054 | /* Called with intr lock held */ | |
2055 | static void ibmvscsis_srp_cmd(struct scsi_info *vscsi, struct viosrp_crq *crq) | |
2056 | { | |
2057 | struct ibmvscsis_cmd *cmd; | |
2058 | struct iu_entry *iue; | |
2059 | struct srp_cmd *srp; | |
2060 | struct srp_tsk_mgmt *tsk; | |
2061 | long rc; | |
2062 | ||
2063 | if (vscsi->request_limit - vscsi->debit <= 0) { | |
2064 | /* Client has exceeded request limit */ | |
2065 | dev_err(&vscsi->dev, "Client exceeded the request limit (%d), debit %d\n", | |
2066 | vscsi->request_limit, vscsi->debit); | |
2067 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2068 | return; | |
2069 | } | |
2070 | ||
2071 | cmd = ibmvscsis_get_free_cmd(vscsi); | |
2072 | if (!cmd) { | |
2073 | dev_err(&vscsi->dev, "srp_cmd failed to get cmd, debit %d\n", | |
2074 | vscsi->debit); | |
2075 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2076 | return; | |
2077 | } | |
2078 | iue = cmd->iue; | |
2079 | srp = &vio_iu(iue)->srp.cmd; | |
2080 | ||
2081 | rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq); | |
2082 | if (rc) { | |
2083 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2084 | return; | |
2085 | } | |
2086 | ||
2087 | if (vscsi->state == SRP_PROCESSING) { | |
2088 | switch (srp->opcode) { | |
2089 | case SRP_LOGIN_REQ: | |
2090 | rc = ibmvscsis_srp_login(vscsi, cmd, crq); | |
2091 | break; | |
2092 | ||
2093 | case SRP_TSK_MGMT: | |
2094 | tsk = &vio_iu(iue)->srp.tsk_mgmt; | |
2095 | pr_debug("tsk_mgmt tag: %llu (0x%llx)\n", tsk->tag, | |
2096 | tsk->tag); | |
2097 | cmd->rsp.tag = tsk->tag; | |
2098 | vscsi->debit += 1; | |
2099 | cmd->type = TASK_MANAGEMENT; | |
2100 | list_add_tail(&cmd->list, &vscsi->schedule_q); | |
2101 | queue_work(vscsi->work_q, &cmd->work); | |
2102 | break; | |
2103 | ||
2104 | case SRP_CMD: | |
2105 | pr_debug("srp_cmd tag: %llu (0x%llx)\n", srp->tag, | |
2106 | srp->tag); | |
2107 | cmd->rsp.tag = srp->tag; | |
2108 | vscsi->debit += 1; | |
2109 | cmd->type = SCSI_CDB; | |
2110 | /* | |
2111 | * We want to keep track of work waiting for | |
2112 | * the workqueue. | |
2113 | */ | |
2114 | list_add_tail(&cmd->list, &vscsi->schedule_q); | |
2115 | queue_work(vscsi->work_q, &cmd->work); | |
2116 | break; | |
2117 | ||
2118 | case SRP_I_LOGOUT: | |
2119 | rc = ibmvscsis_srp_i_logout(vscsi, cmd, crq); | |
2120 | break; | |
2121 | ||
2122 | case SRP_CRED_RSP: | |
2123 | case SRP_AER_RSP: | |
2124 | default: | |
2125 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2126 | dev_err(&vscsi->dev, "invalid srp cmd, opcode %d\n", | |
2127 | (uint)srp->opcode); | |
2128 | ibmvscsis_post_disconnect(vscsi, | |
2129 | ERR_DISCONNECT_RECONNECT, 0); | |
2130 | break; | |
2131 | } | |
2132 | } else if (srp->opcode == SRP_LOGIN_REQ && vscsi->state == CONNECTED) { | |
2133 | rc = ibmvscsis_srp_login(vscsi, cmd, crq); | |
2134 | } else { | |
2135 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2136 | dev_err(&vscsi->dev, "Invalid state %d to handle srp cmd\n", | |
2137 | vscsi->state); | |
2138 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2139 | } | |
2140 | } | |
2141 | ||
2142 | /** | |
2143 | * ibmvscsis_ping_response() - Respond to a ping request | |
2144 | * @vscsi: Pointer to our adapter structure | |
2145 | * | |
2146 | * Let the client know that the server is alive and waiting on | |
2147 | * its native I/O stack. | |
2148 | * If any type of error occurs from the call to queue a ping | |
2149 | * response then the client is either not accepting or receiving | |
2150 | * interrupts. Disconnect with an error. | |
2151 | * | |
2152 | * EXECUTION ENVIRONMENT: | |
2153 | * Interrupt, interrupt lock held | |
2154 | */ | |
2155 | static long ibmvscsis_ping_response(struct scsi_info *vscsi) | |
2156 | { | |
2157 | struct viosrp_crq *crq; | |
2158 | u64 buffer[2] = { 0, 0 }; | |
2159 | long rc; | |
2160 | ||
2161 | crq = (struct viosrp_crq *)&buffer; | |
2162 | crq->valid = VALID_CMD_RESP_EL; | |
2163 | crq->format = (u8)MESSAGE_IN_CRQ; | |
2164 | crq->status = PING_RESPONSE; | |
2165 | ||
2166 | rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]), | |
2167 | cpu_to_be64(buffer[MSG_LOW])); | |
2168 | ||
2169 | switch (rc) { | |
2170 | case H_SUCCESS: | |
2171 | break; | |
2172 | case H_CLOSED: | |
2173 | vscsi->flags |= CLIENT_FAILED; | |
2174 | case H_DROPPED: | |
2175 | vscsi->flags |= RESPONSE_Q_DOWN; | |
2176 | case H_REMOTE_PARM: | |
2177 | dev_err(&vscsi->dev, "ping_response: h_send_crq failed, rc %ld\n", | |
2178 | rc); | |
2179 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2180 | break; | |
2181 | default: | |
2182 | dev_err(&vscsi->dev, "ping_response: h_send_crq returned unknown rc %ld\n", | |
2183 | rc); | |
2184 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); | |
2185 | break; | |
2186 | } | |
2187 | ||
2188 | return rc; | |
2189 | } | |
2190 | ||
2191 | /** | |
2192 | * ibmvscsis_handle_init_compl_msg() - Respond to an Init Complete Message | |
2193 | * @vscsi: Pointer to our adapter structure | |
2194 | * | |
2195 | * Must be called with interrupt lock held. | |
2196 | */ | |
2197 | static long ibmvscsis_handle_init_compl_msg(struct scsi_info *vscsi) | |
2198 | { | |
2199 | long rc = ADAPT_SUCCESS; | |
2200 | ||
2201 | switch (vscsi->state) { | |
2202 | case NO_QUEUE: | |
2203 | case ERR_DISCONNECT: | |
2204 | case ERR_DISCONNECT_RECONNECT: | |
2205 | case ERR_DISCONNECTED: | |
2206 | case UNCONFIGURING: | |
2207 | case UNDEFINED: | |
2208 | rc = ERROR; | |
2209 | break; | |
2210 | ||
2211 | case WAIT_CONNECTION: | |
2212 | vscsi->state = CONNECTED; | |
2213 | break; | |
2214 | ||
2215 | case WAIT_IDLE: | |
2216 | case SRP_PROCESSING: | |
2217 | case CONNECTED: | |
2218 | case WAIT_ENABLED: | |
2219 | case PART_UP_WAIT_ENAB: | |
2220 | default: | |
2221 | rc = ERROR; | |
2222 | dev_err(&vscsi->dev, "init_msg: invalid state %d to get init compl msg\n", | |
2223 | vscsi->state); | |
2224 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2225 | break; | |
2226 | } | |
2227 | ||
2228 | return rc; | |
2229 | } | |
2230 | ||
2231 | /** | |
2232 | * ibmvscsis_handle_init_msg() - Respond to an Init Message | |
2233 | * @vscsi: Pointer to our adapter structure | |
2234 | * | |
2235 | * Must be called with interrupt lock held. | |
2236 | */ | |
2237 | static long ibmvscsis_handle_init_msg(struct scsi_info *vscsi) | |
2238 | { | |
2239 | long rc = ADAPT_SUCCESS; | |
2240 | ||
2241 | switch (vscsi->state) { | |
2242 | case WAIT_ENABLED: | |
2243 | vscsi->state = PART_UP_WAIT_ENAB; | |
2244 | break; | |
2245 | ||
2246 | case WAIT_CONNECTION: | |
2247 | rc = ibmvscsis_send_init_message(vscsi, INIT_COMPLETE_MSG); | |
2248 | switch (rc) { | |
2249 | case H_SUCCESS: | |
2250 | vscsi->state = CONNECTED; | |
2251 | break; | |
2252 | ||
2253 | case H_PARAMETER: | |
2254 | dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n", | |
2255 | rc); | |
2256 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); | |
2257 | break; | |
2258 | ||
2259 | case H_DROPPED: | |
2260 | dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n", | |
2261 | rc); | |
2262 | rc = ERROR; | |
2263 | ibmvscsis_post_disconnect(vscsi, | |
2264 | ERR_DISCONNECT_RECONNECT, 0); | |
2265 | break; | |
2266 | ||
2267 | case H_CLOSED: | |
2268 | pr_warn("init_msg: failed to send, rc %ld\n", rc); | |
2269 | rc = 0; | |
2270 | break; | |
2271 | } | |
2272 | break; | |
2273 | ||
2274 | case UNDEFINED: | |
2275 | rc = ERROR; | |
2276 | break; | |
2277 | ||
2278 | case UNCONFIGURING: | |
2279 | break; | |
2280 | ||
2281 | case PART_UP_WAIT_ENAB: | |
2282 | case CONNECTED: | |
2283 | case SRP_PROCESSING: | |
2284 | case WAIT_IDLE: | |
2285 | case NO_QUEUE: | |
2286 | case ERR_DISCONNECT: | |
2287 | case ERR_DISCONNECT_RECONNECT: | |
2288 | case ERR_DISCONNECTED: | |
2289 | default: | |
2290 | rc = ERROR; | |
2291 | dev_err(&vscsi->dev, "init_msg: invalid state %d to get init msg\n", | |
2292 | vscsi->state); | |
2293 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2294 | break; | |
2295 | } | |
2296 | ||
2297 | return rc; | |
2298 | } | |
2299 | ||
2300 | /** | |
2301 | * ibmvscsis_init_msg() - Respond to an init message | |
2302 | * @vscsi: Pointer to our adapter structure | |
2303 | * @crq: Pointer to CRQ element containing the Init Message | |
2304 | * | |
2305 | * EXECUTION ENVIRONMENT: | |
2306 | * Interrupt, interrupt lock held | |
2307 | */ | |
2308 | static long ibmvscsis_init_msg(struct scsi_info *vscsi, struct viosrp_crq *crq) | |
2309 | { | |
2310 | long rc = ADAPT_SUCCESS; | |
2311 | ||
2312 | pr_debug("init_msg: state 0x%hx\n", vscsi->state); | |
2313 | ||
2314 | rc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO, | |
2315 | (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0, | |
2316 | 0); | |
2317 | if (rc == H_SUCCESS) { | |
2318 | vscsi->client_data.partition_number = | |
2319 | be64_to_cpu(*(u64 *)vscsi->map_buf); | |
2320 | pr_debug("init_msg, part num %d\n", | |
2321 | vscsi->client_data.partition_number); | |
2322 | } else { | |
2323 | pr_debug("init_msg h_vioctl rc %ld\n", rc); | |
2324 | rc = ADAPT_SUCCESS; | |
2325 | } | |
2326 | ||
2327 | if (crq->format == INIT_MSG) { | |
2328 | rc = ibmvscsis_handle_init_msg(vscsi); | |
2329 | } else if (crq->format == INIT_COMPLETE_MSG) { | |
2330 | rc = ibmvscsis_handle_init_compl_msg(vscsi); | |
2331 | } else { | |
2332 | rc = ERROR; | |
2333 | dev_err(&vscsi->dev, "init_msg: invalid format %d\n", | |
2334 | (uint)crq->format); | |
2335 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2336 | } | |
2337 | ||
2338 | return rc; | |
2339 | } | |
2340 | ||
2341 | /** | |
2342 | * ibmvscsis_parse_command() - Parse an element taken from the cmd rsp queue. | |
2343 | * @vscsi: Pointer to our adapter structure | |
2344 | * @crq: Pointer to CRQ element containing the SRP request | |
2345 | * | |
2346 | * This function will return success if the command queue element is valid | |
2347 | * and the srp iu or MAD request it pointed to was also valid. That does | |
2348 | * not mean that an error was not returned to the client. | |
2349 | * | |
2350 | * EXECUTION ENVIRONMENT: | |
2351 | * Interrupt, intr lock held | |
2352 | */ | |
2353 | static long ibmvscsis_parse_command(struct scsi_info *vscsi, | |
2354 | struct viosrp_crq *crq) | |
2355 | { | |
2356 | long rc = ADAPT_SUCCESS; | |
2357 | ||
2358 | switch (crq->valid) { | |
2359 | case VALID_CMD_RESP_EL: | |
2360 | switch (crq->format) { | |
2361 | case OS400_FORMAT: | |
2362 | case AIX_FORMAT: | |
2363 | case LINUX_FORMAT: | |
2364 | case MAD_FORMAT: | |
2365 | if (vscsi->flags & PROCESSING_MAD) { | |
2366 | rc = ERROR; | |
2367 | dev_err(&vscsi->dev, "parse_command: already processing mad\n"); | |
2368 | ibmvscsis_post_disconnect(vscsi, | |
2369 | ERR_DISCONNECT_RECONNECT, | |
2370 | 0); | |
2371 | } else { | |
2372 | vscsi->flags |= PROCESSING_MAD; | |
2373 | rc = ibmvscsis_mad(vscsi, crq); | |
2374 | } | |
2375 | break; | |
2376 | ||
2377 | case SRP_FORMAT: | |
2378 | ibmvscsis_srp_cmd(vscsi, crq); | |
2379 | break; | |
2380 | ||
2381 | case MESSAGE_IN_CRQ: | |
2382 | if (crq->status == PING) | |
2383 | ibmvscsis_ping_response(vscsi); | |
2384 | break; | |
2385 | ||
2386 | default: | |
2387 | dev_err(&vscsi->dev, "parse_command: invalid format %d\n", | |
2388 | (uint)crq->format); | |
2389 | ibmvscsis_post_disconnect(vscsi, | |
2390 | ERR_DISCONNECT_RECONNECT, 0); | |
2391 | break; | |
2392 | } | |
2393 | break; | |
2394 | ||
2395 | case VALID_TRANS_EVENT: | |
2396 | rc = ibmvscsis_trans_event(vscsi, crq); | |
2397 | break; | |
2398 | ||
2399 | case VALID_INIT_MSG: | |
2400 | rc = ibmvscsis_init_msg(vscsi, crq); | |
2401 | break; | |
2402 | ||
2403 | default: | |
2404 | dev_err(&vscsi->dev, "parse_command: invalid valid field %d\n", | |
2405 | (uint)crq->valid); | |
2406 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2407 | break; | |
2408 | } | |
2409 | ||
2410 | /* | |
2411 | * Return only what the interrupt handler cares | |
2412 | * about. Most errors we keep right on trucking. | |
2413 | */ | |
2414 | rc = vscsi->flags & SCHEDULE_DISCONNECT; | |
2415 | ||
2416 | return rc; | |
2417 | } | |
2418 | ||
2419 | static int read_dma_window(struct scsi_info *vscsi) | |
2420 | { | |
2421 | struct vio_dev *vdev = vscsi->dma_dev; | |
2422 | const __be32 *dma_window; | |
2423 | const __be32 *prop; | |
2424 | ||
2425 | /* TODO Using of_parse_dma_window would be better, but it doesn't give | |
2426 | * a way to read multiple windows without already knowing the size of | |
2427 | * a window or the number of windows. | |
2428 | */ | |
2429 | dma_window = (const __be32 *)vio_get_attribute(vdev, | |
2430 | "ibm,my-dma-window", | |
2431 | NULL); | |
2432 | if (!dma_window) { | |
2433 | pr_err("Couldn't find ibm,my-dma-window property\n"); | |
2434 | return -1; | |
2435 | } | |
2436 | ||
2437 | vscsi->dds.window[LOCAL].liobn = be32_to_cpu(*dma_window); | |
2438 | dma_window++; | |
2439 | ||
2440 | prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-address-cells", | |
2441 | NULL); | |
2442 | if (!prop) { | |
2443 | pr_warn("Couldn't find ibm,#dma-address-cells property\n"); | |
2444 | dma_window++; | |
2445 | } else { | |
2446 | dma_window += be32_to_cpu(*prop); | |
2447 | } | |
2448 | ||
2449 | prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-size-cells", | |
2450 | NULL); | |
2451 | if (!prop) { | |
2452 | pr_warn("Couldn't find ibm,#dma-size-cells property\n"); | |
2453 | dma_window++; | |
2454 | } else { | |
2455 | dma_window += be32_to_cpu(*prop); | |
2456 | } | |
2457 | ||
2458 | /* dma_window should point to the second window now */ | |
2459 | vscsi->dds.window[REMOTE].liobn = be32_to_cpu(*dma_window); | |
2460 | ||
2461 | return 0; | |
2462 | } | |
2463 | ||
2464 | static struct ibmvscsis_tport *ibmvscsis_lookup_port(const char *name) | |
2465 | { | |
2466 | struct ibmvscsis_tport *tport = NULL; | |
2467 | struct vio_dev *vdev; | |
2468 | struct scsi_info *vscsi; | |
2469 | ||
2470 | spin_lock_bh(&ibmvscsis_dev_lock); | |
2471 | list_for_each_entry(vscsi, &ibmvscsis_dev_list, list) { | |
2472 | vdev = vscsi->dma_dev; | |
2473 | if (!strcmp(dev_name(&vdev->dev), name)) { | |
2474 | tport = &vscsi->tport; | |
2475 | break; | |
2476 | } | |
2477 | } | |
2478 | spin_unlock_bh(&ibmvscsis_dev_lock); | |
2479 | ||
2480 | return tport; | |
2481 | } | |
2482 | ||
2483 | /** | |
2484 | * ibmvscsis_parse_cmd() - Parse SRP Command | |
2485 | * @vscsi: Pointer to our adapter structure | |
2486 | * @cmd: Pointer to command element with SRP command | |
2487 | * | |
2488 | * Parse the srp command; if it is valid then submit it to tcm. | |
2489 | * Note: The return code does not reflect the status of the SCSI CDB. | |
2490 | * | |
2491 | * EXECUTION ENVIRONMENT: | |
2492 | * Process level | |
2493 | */ | |
2494 | static void ibmvscsis_parse_cmd(struct scsi_info *vscsi, | |
2495 | struct ibmvscsis_cmd *cmd) | |
2496 | { | |
2497 | struct iu_entry *iue = cmd->iue; | |
2498 | struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf; | |
2499 | struct ibmvscsis_nexus *nexus; | |
2500 | u64 data_len = 0; | |
2501 | enum dma_data_direction dir; | |
2502 | int attr = 0; | |
2503 | int rc = 0; | |
2504 | ||
2505 | nexus = vscsi->tport.ibmv_nexus; | |
2506 | /* | |
2507 | * additional length in bytes. Note that the SRP spec says that | |
2508 | * additional length is in 4-byte words, but technically the | |
2509 | * additional length field is only the upper 6 bits of the byte. | |
2510 | * The lower 2 bits are reserved. If the lower 2 bits are 0 (as | |
2511 | * all reserved fields should be), then interpreting the byte as | |
2512 | * an int will yield the length in bytes. | |
2513 | */ | |
2514 | if (srp->add_cdb_len & 0x03) { | |
2515 | dev_err(&vscsi->dev, "parse_cmd: reserved bits set in IU\n"); | |
2516 | spin_lock_bh(&vscsi->intr_lock); | |
2517 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2518 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2519 | spin_unlock_bh(&vscsi->intr_lock); | |
2520 | return; | |
2521 | } | |
2522 | ||
2523 | if (srp_get_desc_table(srp, &dir, &data_len)) { | |
2524 | dev_err(&vscsi->dev, "0x%llx: parsing SRP descriptor table failed.\n", | |
2525 | srp->tag); | |
2526 | goto fail; | |
2527 | return; | |
2528 | } | |
2529 | ||
2530 | cmd->rsp.sol_not = srp->sol_not; | |
2531 | ||
2532 | switch (srp->task_attr) { | |
2533 | case SRP_SIMPLE_TASK: | |
2534 | attr = TCM_SIMPLE_TAG; | |
2535 | break; | |
2536 | case SRP_ORDERED_TASK: | |
2537 | attr = TCM_ORDERED_TAG; | |
2538 | break; | |
2539 | case SRP_HEAD_TASK: | |
2540 | attr = TCM_HEAD_TAG; | |
2541 | break; | |
2542 | case SRP_ACA_TASK: | |
2543 | attr = TCM_ACA_TAG; | |
2544 | break; | |
2545 | default: | |
2546 | dev_err(&vscsi->dev, "Invalid task attribute %d\n", | |
2547 | srp->task_attr); | |
2548 | goto fail; | |
2549 | } | |
2550 | ||
2551 | cmd->se_cmd.tag = be64_to_cpu(srp->tag); | |
2552 | ||
2553 | spin_lock_bh(&vscsi->intr_lock); | |
2554 | list_add_tail(&cmd->list, &vscsi->active_q); | |
2555 | spin_unlock_bh(&vscsi->intr_lock); | |
2556 | ||
2557 | srp->lun.scsi_lun[0] &= 0x3f; | |
2558 | ||
2559 | pr_debug("calling submit_cmd, se_cmd %p, lun 0x%llx, cdb 0x%x, attr:%d\n", | |
2560 | &cmd->se_cmd, scsilun_to_int(&srp->lun), (int)srp->cdb[0], | |
2561 | attr); | |
2562 | ||
2563 | rc = target_submit_cmd(&cmd->se_cmd, nexus->se_sess, srp->cdb, | |
2564 | cmd->sense_buf, scsilun_to_int(&srp->lun), | |
2565 | data_len, attr, dir, 0); | |
2566 | if (rc) { | |
2567 | dev_err(&vscsi->dev, "target_submit_cmd failed, rc %d\n", rc); | |
2568 | goto fail; | |
2569 | } | |
2570 | return; | |
2571 | ||
2572 | fail: | |
2573 | spin_lock_bh(&vscsi->intr_lock); | |
2574 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2575 | spin_unlock_bh(&vscsi->intr_lock); | |
2576 | } | |
2577 | ||
2578 | /** | |
2579 | * ibmvscsis_parse_task() - Parse SRP Task Management Request | |
2580 | * @vscsi: Pointer to our adapter structure | |
2581 | * @cmd: Pointer to command element with SRP task management request | |
2582 | * | |
2583 | * Parse the srp task management request; if it is valid then submit it to tcm. | |
2584 | * Note: The return code does not reflect the status of the task management | |
2585 | * request. | |
2586 | * | |
2587 | * EXECUTION ENVIRONMENT: | |
2588 | * Processor level | |
2589 | */ | |
2590 | static void ibmvscsis_parse_task(struct scsi_info *vscsi, | |
2591 | struct ibmvscsis_cmd *cmd) | |
2592 | { | |
2593 | struct iu_entry *iue = cmd->iue; | |
2594 | struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt; | |
2595 | int tcm_type; | |
2596 | u64 tag_to_abort = 0; | |
2597 | int rc = 0; | |
2598 | struct ibmvscsis_nexus *nexus; | |
2599 | ||
2600 | nexus = vscsi->tport.ibmv_nexus; | |
2601 | ||
2602 | cmd->rsp.sol_not = srp_tsk->sol_not; | |
2603 | ||
2604 | switch (srp_tsk->tsk_mgmt_func) { | |
2605 | case SRP_TSK_ABORT_TASK: | |
2606 | tcm_type = TMR_ABORT_TASK; | |
2607 | tag_to_abort = be64_to_cpu(srp_tsk->task_tag); | |
2608 | break; | |
2609 | case SRP_TSK_ABORT_TASK_SET: | |
2610 | tcm_type = TMR_ABORT_TASK_SET; | |
2611 | break; | |
2612 | case SRP_TSK_CLEAR_TASK_SET: | |
2613 | tcm_type = TMR_CLEAR_TASK_SET; | |
2614 | break; | |
2615 | case SRP_TSK_LUN_RESET: | |
2616 | tcm_type = TMR_LUN_RESET; | |
2617 | break; | |
2618 | case SRP_TSK_CLEAR_ACA: | |
2619 | tcm_type = TMR_CLEAR_ACA; | |
2620 | break; | |
2621 | default: | |
2622 | dev_err(&vscsi->dev, "unknown task mgmt func %d\n", | |
2623 | srp_tsk->tsk_mgmt_func); | |
2624 | cmd->se_cmd.se_tmr_req->response = | |
2625 | TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; | |
2626 | rc = -1; | |
2627 | break; | |
2628 | } | |
2629 | ||
2630 | if (!rc) { | |
2631 | cmd->se_cmd.tag = be64_to_cpu(srp_tsk->tag); | |
2632 | ||
2633 | spin_lock_bh(&vscsi->intr_lock); | |
2634 | list_add_tail(&cmd->list, &vscsi->active_q); | |
2635 | spin_unlock_bh(&vscsi->intr_lock); | |
2636 | ||
2637 | srp_tsk->lun.scsi_lun[0] &= 0x3f; | |
2638 | ||
2639 | pr_debug("calling submit_tmr, func %d\n", | |
2640 | srp_tsk->tsk_mgmt_func); | |
2641 | rc = target_submit_tmr(&cmd->se_cmd, nexus->se_sess, NULL, | |
2642 | scsilun_to_int(&srp_tsk->lun), srp_tsk, | |
2643 | tcm_type, GFP_KERNEL, tag_to_abort, 0); | |
2644 | if (rc) { | |
2645 | dev_err(&vscsi->dev, "target_submit_tmr failed, rc %d\n", | |
2646 | rc); | |
2647 | cmd->se_cmd.se_tmr_req->response = | |
2648 | TMR_FUNCTION_REJECTED; | |
2649 | } | |
2650 | } | |
2651 | ||
2652 | if (rc) | |
2653 | transport_send_check_condition_and_sense(&cmd->se_cmd, 0, 0); | |
2654 | } | |
2655 | ||
2656 | static void ibmvscsis_scheduler(struct work_struct *work) | |
2657 | { | |
2658 | struct ibmvscsis_cmd *cmd = container_of(work, struct ibmvscsis_cmd, | |
2659 | work); | |
2660 | struct scsi_info *vscsi = cmd->adapter; | |
2661 | ||
2662 | spin_lock_bh(&vscsi->intr_lock); | |
2663 | ||
2664 | /* Remove from schedule_q */ | |
2665 | list_del(&cmd->list); | |
2666 | ||
2667 | /* Don't submit cmd if we're disconnecting */ | |
2668 | if (vscsi->flags & (SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED)) { | |
2669 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2670 | ||
2671 | /* ibmvscsis_disconnect might be waiting for us */ | |
2672 | if (list_empty(&vscsi->active_q) && | |
2673 | list_empty(&vscsi->schedule_q) && | |
2674 | (vscsi->flags & WAIT_FOR_IDLE)) { | |
2675 | vscsi->flags &= ~WAIT_FOR_IDLE; | |
2676 | complete(&vscsi->wait_idle); | |
2677 | } | |
2678 | ||
2679 | spin_unlock_bh(&vscsi->intr_lock); | |
2680 | return; | |
2681 | } | |
2682 | ||
2683 | spin_unlock_bh(&vscsi->intr_lock); | |
2684 | ||
2685 | switch (cmd->type) { | |
2686 | case SCSI_CDB: | |
2687 | ibmvscsis_parse_cmd(vscsi, cmd); | |
2688 | break; | |
2689 | case TASK_MANAGEMENT: | |
2690 | ibmvscsis_parse_task(vscsi, cmd); | |
2691 | break; | |
2692 | default: | |
2693 | dev_err(&vscsi->dev, "scheduler, invalid cmd type %d\n", | |
2694 | cmd->type); | |
2695 | spin_lock_bh(&vscsi->intr_lock); | |
2696 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2697 | spin_unlock_bh(&vscsi->intr_lock); | |
2698 | break; | |
2699 | } | |
2700 | } | |
2701 | ||
2702 | static int ibmvscsis_alloc_cmds(struct scsi_info *vscsi, int num) | |
2703 | { | |
2704 | struct ibmvscsis_cmd *cmd; | |
2705 | int i; | |
2706 | ||
2707 | INIT_LIST_HEAD(&vscsi->free_cmd); | |
2708 | vscsi->cmd_pool = kcalloc(num, sizeof(struct ibmvscsis_cmd), | |
2709 | GFP_KERNEL); | |
2710 | if (!vscsi->cmd_pool) | |
2711 | return -ENOMEM; | |
2712 | ||
2713 | for (i = 0, cmd = (struct ibmvscsis_cmd *)vscsi->cmd_pool; i < num; | |
2714 | i++, cmd++) { | |
2715 | cmd->adapter = vscsi; | |
2716 | INIT_WORK(&cmd->work, ibmvscsis_scheduler); | |
2717 | list_add_tail(&cmd->list, &vscsi->free_cmd); | |
2718 | } | |
2719 | ||
2720 | return 0; | |
2721 | } | |
2722 | ||
2723 | static void ibmvscsis_free_cmds(struct scsi_info *vscsi) | |
2724 | { | |
2725 | kfree(vscsi->cmd_pool); | |
2726 | vscsi->cmd_pool = NULL; | |
2727 | INIT_LIST_HEAD(&vscsi->free_cmd); | |
2728 | } | |
2729 | ||
2730 | /** | |
2731 | * ibmvscsis_service_wait_q() - Service Waiting Queue | |
2732 | * @timer: Pointer to timer which has expired | |
2733 | * | |
2734 | * This routine is called when the timer pops to service the waiting | |
2735 | * queue. Elements on the queue have completed, their responses have been | |
2736 | * copied to the client, but the client's response queue was full so | |
2737 | * the queue message could not be sent. The routine grabs the proper locks | |
2738 | * and calls send messages. | |
2739 | * | |
2740 | * EXECUTION ENVIRONMENT: | |
2741 | * called at interrupt level | |
2742 | */ | |
2743 | static enum hrtimer_restart ibmvscsis_service_wait_q(struct hrtimer *timer) | |
2744 | { | |
2745 | struct timer_cb *p_timer = container_of(timer, struct timer_cb, timer); | |
2746 | struct scsi_info *vscsi = container_of(p_timer, struct scsi_info, | |
2747 | rsp_q_timer); | |
2748 | ||
2749 | spin_lock_bh(&vscsi->intr_lock); | |
2750 | p_timer->timer_pops += 1; | |
2751 | p_timer->started = false; | |
2752 | ibmvscsis_send_messages(vscsi); | |
2753 | spin_unlock_bh(&vscsi->intr_lock); | |
2754 | ||
2755 | return HRTIMER_NORESTART; | |
2756 | } | |
2757 | ||
2758 | static long ibmvscsis_alloctimer(struct scsi_info *vscsi) | |
2759 | { | |
2760 | struct timer_cb *p_timer; | |
2761 | ||
2762 | p_timer = &vscsi->rsp_q_timer; | |
2763 | hrtimer_init(&p_timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
2764 | ||
2765 | p_timer->timer.function = ibmvscsis_service_wait_q; | |
2766 | p_timer->started = false; | |
2767 | p_timer->timer_pops = 0; | |
2768 | ||
2769 | return ADAPT_SUCCESS; | |
2770 | } | |
2771 | ||
2772 | static void ibmvscsis_freetimer(struct scsi_info *vscsi) | |
2773 | { | |
2774 | struct timer_cb *p_timer; | |
2775 | ||
2776 | p_timer = &vscsi->rsp_q_timer; | |
2777 | ||
2778 | (void)hrtimer_cancel(&p_timer->timer); | |
2779 | ||
2780 | p_timer->started = false; | |
2781 | p_timer->timer_pops = 0; | |
2782 | } | |
2783 | ||
2784 | static irqreturn_t ibmvscsis_interrupt(int dummy, void *data) | |
2785 | { | |
2786 | struct scsi_info *vscsi = data; | |
2787 | ||
2788 | vio_disable_interrupts(vscsi->dma_dev); | |
2789 | tasklet_schedule(&vscsi->work_task); | |
2790 | ||
2791 | return IRQ_HANDLED; | |
2792 | } | |
2793 | ||
2794 | /** | |
2795 | * ibmvscsis_check_q() - Helper function to Check Init Message Valid | |
2796 | * @vscsi: Pointer to our adapter structure | |
2797 | * | |
2798 | * Checks if a initialize message was queued by the initiatior | |
2799 | * while the timing window was open. This function is called from | |
2800 | * probe after the CRQ is created and interrupts are enabled. | |
2801 | * It would only be used by adapters who wait for some event before | |
2802 | * completing the init handshake with the client. For ibmvscsi, this | |
2803 | * event is waiting for the port to be enabled. | |
2804 | * | |
2805 | * EXECUTION ENVIRONMENT: | |
2806 | * Process level only, interrupt lock held | |
2807 | */ | |
2808 | static long ibmvscsis_check_q(struct scsi_info *vscsi) | |
2809 | { | |
2810 | uint format; | |
2811 | long rc; | |
2812 | ||
2813 | rc = ibmvscsis_check_init_msg(vscsi, &format); | |
2814 | if (rc) | |
2815 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2816 | else if (format == UNUSED_FORMAT) | |
2817 | vscsi->state = WAIT_ENABLED; | |
2818 | else | |
2819 | vscsi->state = PART_UP_WAIT_ENAB; | |
2820 | ||
2821 | return rc; | |
2822 | } | |
2823 | ||
2824 | /** | |
2825 | * ibmvscsis_enable_change_state() - Set new state based on enabled status | |
2826 | * @vscsi: Pointer to our adapter structure | |
2827 | * | |
2828 | * This function determines our new state now that we are enabled. This | |
2829 | * may involve sending an Init Complete message to the client. | |
2830 | * | |
2831 | * Must be called with interrupt lock held. | |
2832 | */ | |
2833 | static long ibmvscsis_enable_change_state(struct scsi_info *vscsi) | |
2834 | { | |
2835 | long rc = ADAPT_SUCCESS; | |
2836 | ||
2837 | handle_state_change: | |
2838 | switch (vscsi->state) { | |
2839 | case WAIT_ENABLED: | |
2840 | rc = ibmvscsis_send_init_message(vscsi, INIT_MSG); | |
2841 | switch (rc) { | |
2842 | case H_SUCCESS: | |
2843 | case H_DROPPED: | |
2844 | case H_CLOSED: | |
2845 | vscsi->state = WAIT_CONNECTION; | |
2846 | rc = ADAPT_SUCCESS; | |
2847 | break; | |
2848 | ||
2849 | case H_PARAMETER: | |
2850 | break; | |
2851 | ||
2852 | case H_HARDWARE: | |
2853 | break; | |
2854 | ||
2855 | default: | |
2856 | vscsi->state = UNDEFINED; | |
2857 | rc = H_HARDWARE; | |
2858 | break; | |
2859 | } | |
2860 | break; | |
2861 | case PART_UP_WAIT_ENAB: | |
2862 | rc = ibmvscsis_send_init_message(vscsi, INIT_COMPLETE_MSG); | |
2863 | switch (rc) { | |
2864 | case H_SUCCESS: | |
2865 | vscsi->state = CONNECTED; | |
2866 | rc = ADAPT_SUCCESS; | |
2867 | break; | |
2868 | ||
2869 | case H_DROPPED: | |
2870 | case H_CLOSED: | |
2871 | vscsi->state = WAIT_ENABLED; | |
2872 | goto handle_state_change; | |
2873 | ||
2874 | case H_PARAMETER: | |
2875 | break; | |
2876 | ||
2877 | case H_HARDWARE: | |
2878 | break; | |
2879 | ||
2880 | default: | |
2881 | rc = H_HARDWARE; | |
2882 | break; | |
2883 | } | |
2884 | break; | |
2885 | ||
2886 | case WAIT_CONNECTION: | |
2887 | case WAIT_IDLE: | |
2888 | case SRP_PROCESSING: | |
2889 | case CONNECTED: | |
2890 | rc = ADAPT_SUCCESS; | |
2891 | break; | |
2892 | /* should not be able to get here */ | |
2893 | case UNCONFIGURING: | |
2894 | rc = ERROR; | |
2895 | vscsi->state = UNDEFINED; | |
2896 | break; | |
2897 | ||
2898 | /* driver should never allow this to happen */ | |
2899 | case ERR_DISCONNECT: | |
2900 | case ERR_DISCONNECT_RECONNECT: | |
2901 | default: | |
2902 | dev_err(&vscsi->dev, "in invalid state %d during enable_change_state\n", | |
2903 | vscsi->state); | |
2904 | rc = ADAPT_SUCCESS; | |
2905 | break; | |
2906 | } | |
2907 | ||
2908 | return rc; | |
2909 | } | |
2910 | ||
2911 | /** | |
2912 | * ibmvscsis_create_command_q() - Create Command Queue | |
2913 | * @vscsi: Pointer to our adapter structure | |
2914 | * @num_cmds: Currently unused. In the future, may be used to determine | |
2915 | * the size of the CRQ. | |
2916 | * | |
2917 | * Allocates memory for command queue maps remote memory into an ioba | |
2918 | * initializes the command response queue | |
2919 | * | |
2920 | * EXECUTION ENVIRONMENT: | |
2921 | * Process level only | |
2922 | */ | |
2923 | static long ibmvscsis_create_command_q(struct scsi_info *vscsi, int num_cmds) | |
2924 | { | |
2925 | long rc = 0; | |
2926 | int pages; | |
2927 | struct vio_dev *vdev = vscsi->dma_dev; | |
2928 | ||
2929 | /* We might support multiple pages in the future, but just 1 for now */ | |
2930 | pages = 1; | |
2931 | ||
2932 | vscsi->cmd_q.size = pages; | |
2933 | ||
2934 | vscsi->cmd_q.base_addr = | |
2935 | (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); | |
2936 | if (!vscsi->cmd_q.base_addr) | |
2937 | return -ENOMEM; | |
2938 | ||
2939 | vscsi->cmd_q.mask = ((uint)pages * CRQ_PER_PAGE) - 1; | |
2940 | ||
2941 | vscsi->cmd_q.crq_token = dma_map_single(&vdev->dev, | |
2942 | vscsi->cmd_q.base_addr, | |
2943 | PAGE_SIZE, DMA_BIDIRECTIONAL); | |
2944 | if (dma_mapping_error(&vdev->dev, vscsi->cmd_q.crq_token)) { | |
2945 | free_page((unsigned long)vscsi->cmd_q.base_addr); | |
2946 | return -ENOMEM; | |
2947 | } | |
2948 | ||
2949 | rc = h_reg_crq(vscsi->dds.unit_id, vscsi->cmd_q.crq_token, PAGE_SIZE); | |
2950 | if (rc) { | |
2951 | if (rc == H_CLOSED) { | |
2952 | vscsi->state = WAIT_ENABLED; | |
2953 | rc = 0; | |
2954 | } else { | |
2955 | dma_unmap_single(&vdev->dev, vscsi->cmd_q.crq_token, | |
2956 | PAGE_SIZE, DMA_BIDIRECTIONAL); | |
2957 | free_page((unsigned long)vscsi->cmd_q.base_addr); | |
2958 | rc = -ENODEV; | |
2959 | } | |
2960 | } else { | |
2961 | vscsi->state = WAIT_ENABLED; | |
2962 | } | |
2963 | ||
2964 | return rc; | |
2965 | } | |
2966 | ||
2967 | /** | |
2968 | * ibmvscsis_destroy_command_q - Destroy Command Queue | |
2969 | * @vscsi: Pointer to our adapter structure | |
2970 | * | |
2971 | * Releases memory for command queue and unmaps mapped remote memory. | |
2972 | * | |
2973 | * EXECUTION ENVIRONMENT: | |
2974 | * Process level only | |
2975 | */ | |
2976 | static void ibmvscsis_destroy_command_q(struct scsi_info *vscsi) | |
2977 | { | |
2978 | dma_unmap_single(&vscsi->dma_dev->dev, vscsi->cmd_q.crq_token, | |
2979 | PAGE_SIZE, DMA_BIDIRECTIONAL); | |
2980 | free_page((unsigned long)vscsi->cmd_q.base_addr); | |
2981 | vscsi->cmd_q.base_addr = NULL; | |
2982 | vscsi->state = NO_QUEUE; | |
2983 | } | |
2984 | ||
2985 | static u8 ibmvscsis_fast_fail(struct scsi_info *vscsi, | |
2986 | struct ibmvscsis_cmd *cmd) | |
2987 | { | |
2988 | struct iu_entry *iue = cmd->iue; | |
2989 | struct se_cmd *se_cmd = &cmd->se_cmd; | |
2990 | struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf; | |
2991 | struct scsi_sense_hdr sshdr; | |
2992 | u8 rc = se_cmd->scsi_status; | |
2993 | ||
2994 | if (vscsi->fast_fail && (READ_CMD(srp->cdb) || WRITE_CMD(srp->cdb))) | |
2995 | if (scsi_normalize_sense(se_cmd->sense_buffer, | |
2996 | se_cmd->scsi_sense_length, &sshdr)) | |
2997 | if (sshdr.sense_key == HARDWARE_ERROR && | |
2998 | (se_cmd->residual_count == 0 || | |
2999 | se_cmd->residual_count == se_cmd->data_length)) { | |
3000 | rc = NO_SENSE; | |
3001 | cmd->flags |= CMD_FAST_FAIL; | |
3002 | } | |
3003 | ||
3004 | return rc; | |
3005 | } | |
3006 | ||
3007 | /** | |
3008 | * srp_build_response() - Build an SRP response buffer | |
3009 | * @vscsi: Pointer to our adapter structure | |
3010 | * @cmd: Pointer to command for which to send the response | |
3011 | * @len_p: Where to return the length of the IU response sent. This | |
3012 | * is needed to construct the CRQ response. | |
3013 | * | |
3014 | * Build the SRP response buffer and copy it to the client's memory space. | |
3015 | */ | |
3016 | static long srp_build_response(struct scsi_info *vscsi, | |
3017 | struct ibmvscsis_cmd *cmd, uint *len_p) | |
3018 | { | |
3019 | struct iu_entry *iue = cmd->iue; | |
3020 | struct se_cmd *se_cmd = &cmd->se_cmd; | |
3021 | struct srp_rsp *rsp; | |
3022 | uint len; | |
3023 | u32 rsp_code; | |
3024 | char *data; | |
3025 | u32 *tsk_status; | |
3026 | long rc = ADAPT_SUCCESS; | |
3027 | ||
3028 | spin_lock_bh(&vscsi->intr_lock); | |
3029 | ||
3030 | rsp = &vio_iu(iue)->srp.rsp; | |
3031 | len = sizeof(*rsp); | |
3032 | memset(rsp, 0, len); | |
3033 | data = rsp->data; | |
3034 | ||
3035 | rsp->opcode = SRP_RSP; | |
3036 | ||
3037 | if (vscsi->credit > 0 && vscsi->state == SRP_PROCESSING) | |
3038 | rsp->req_lim_delta = cpu_to_be32(vscsi->credit); | |
3039 | else | |
3040 | rsp->req_lim_delta = cpu_to_be32(1 + vscsi->credit); | |
3041 | rsp->tag = cmd->rsp.tag; | |
3042 | rsp->flags = 0; | |
3043 | ||
3044 | if (cmd->type == SCSI_CDB) { | |
3045 | rsp->status = ibmvscsis_fast_fail(vscsi, cmd); | |
3046 | if (rsp->status) { | |
3047 | pr_debug("build_resp: cmd %p, scsi status %d\n", cmd, | |
3048 | (int)rsp->status); | |
3049 | ibmvscsis_determine_resid(se_cmd, rsp); | |
3050 | if (se_cmd->scsi_sense_length && se_cmd->sense_buffer) { | |
3051 | rsp->sense_data_len = | |
3052 | cpu_to_be32(se_cmd->scsi_sense_length); | |
3053 | rsp->flags |= SRP_RSP_FLAG_SNSVALID; | |
3054 | len += se_cmd->scsi_sense_length; | |
3055 | memcpy(data, se_cmd->sense_buffer, | |
3056 | se_cmd->scsi_sense_length); | |
3057 | } | |
3058 | rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> | |
3059 | UCSOLNT_RESP_SHIFT; | |
3060 | } else if (cmd->flags & CMD_FAST_FAIL) { | |
3061 | pr_debug("build_resp: cmd %p, fast fail\n", cmd); | |
3062 | rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> | |
3063 | UCSOLNT_RESP_SHIFT; | |
3064 | } else { | |
3065 | rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >> | |
3066 | SCSOLNT_RESP_SHIFT; | |
3067 | } | |
3068 | } else { | |
3069 | /* this is task management */ | |
3070 | rsp->status = 0; | |
3071 | rsp->resp_data_len = cpu_to_be32(4); | |
3072 | rsp->flags |= SRP_RSP_FLAG_RSPVALID; | |
3073 | ||
3074 | switch (se_cmd->se_tmr_req->response) { | |
3075 | case TMR_FUNCTION_COMPLETE: | |
3076 | case TMR_TASK_DOES_NOT_EXIST: | |
3077 | rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_COMPLETE; | |
3078 | rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >> | |
3079 | SCSOLNT_RESP_SHIFT; | |
3080 | break; | |
3081 | case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: | |
3082 | case TMR_LUN_DOES_NOT_EXIST: | |
3083 | rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_NOT_SUPPORTED; | |
3084 | rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> | |
3085 | UCSOLNT_RESP_SHIFT; | |
3086 | break; | |
3087 | case TMR_FUNCTION_FAILED: | |
3088 | case TMR_FUNCTION_REJECTED: | |
3089 | default: | |
3090 | rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_FAILED; | |
3091 | rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> | |
3092 | UCSOLNT_RESP_SHIFT; | |
3093 | break; | |
3094 | } | |
3095 | ||
3096 | tsk_status = (u32 *)data; | |
3097 | *tsk_status = cpu_to_be32(rsp_code); | |
3098 | data = (char *)(tsk_status + 1); | |
3099 | len += 4; | |
3100 | } | |
3101 | ||
3102 | dma_wmb(); | |
3103 | rc = h_copy_rdma(len, vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma, | |
3104 | vscsi->dds.window[REMOTE].liobn, | |
3105 | be64_to_cpu(iue->remote_token)); | |
3106 | ||
3107 | switch (rc) { | |
3108 | case H_SUCCESS: | |
3109 | vscsi->credit = 0; | |
3110 | *len_p = len; | |
3111 | break; | |
3112 | case H_PERMISSION: | |
3113 | if (connection_broken(vscsi)) | |
3114 | vscsi->flags |= RESPONSE_Q_DOWN | CLIENT_FAILED; | |
3115 | ||
3116 | dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld, flags 0x%x, state 0x%hx\n", | |
3117 | rc, vscsi->flags, vscsi->state); | |
3118 | break; | |
3119 | case H_SOURCE_PARM: | |
3120 | case H_DEST_PARM: | |
3121 | default: | |
3122 | dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld\n", | |
3123 | rc); | |
3124 | break; | |
3125 | } | |
3126 | ||
3127 | spin_unlock_bh(&vscsi->intr_lock); | |
3128 | ||
3129 | return rc; | |
3130 | } | |
3131 | ||
3132 | static int ibmvscsis_rdma(struct ibmvscsis_cmd *cmd, struct scatterlist *sg, | |
3133 | int nsg, struct srp_direct_buf *md, int nmd, | |
3134 | enum dma_data_direction dir, unsigned int bytes) | |
3135 | { | |
3136 | struct iu_entry *iue = cmd->iue; | |
3137 | struct srp_target *target = iue->target; | |
3138 | struct scsi_info *vscsi = target->ldata; | |
3139 | struct scatterlist *sgp; | |
3140 | dma_addr_t client_ioba, server_ioba; | |
3141 | ulong buf_len; | |
3142 | ulong client_len, server_len; | |
3143 | int md_idx; | |
3144 | long tx_len; | |
3145 | long rc = 0; | |
3146 | ||
3147 | pr_debug("rdma: dir %d, bytes 0x%x\n", dir, bytes); | |
3148 | ||
3149 | if (bytes == 0) | |
3150 | return 0; | |
3151 | ||
3152 | sgp = sg; | |
3153 | client_len = 0; | |
3154 | server_len = 0; | |
3155 | md_idx = 0; | |
3156 | tx_len = bytes; | |
3157 | ||
3158 | do { | |
3159 | if (client_len == 0) { | |
3160 | if (md_idx >= nmd) { | |
3161 | dev_err(&vscsi->dev, "rdma: ran out of client memory descriptors\n"); | |
3162 | rc = -EIO; | |
3163 | break; | |
3164 | } | |
3165 | client_ioba = be64_to_cpu(md[md_idx].va); | |
3166 | client_len = be32_to_cpu(md[md_idx].len); | |
3167 | } | |
3168 | if (server_len == 0) { | |
3169 | if (!sgp) { | |
3170 | dev_err(&vscsi->dev, "rdma: ran out of scatter/gather list\n"); | |
3171 | rc = -EIO; | |
3172 | break; | |
3173 | } | |
3174 | server_ioba = sg_dma_address(sgp); | |
3175 | server_len = sg_dma_len(sgp); | |
3176 | } | |
3177 | ||
3178 | buf_len = tx_len; | |
3179 | ||
3180 | if (buf_len > client_len) | |
3181 | buf_len = client_len; | |
3182 | ||
3183 | if (buf_len > server_len) | |
3184 | buf_len = server_len; | |
3185 | ||
3186 | if (buf_len > max_vdma_size) | |
3187 | buf_len = max_vdma_size; | |
3188 | ||
3189 | if (dir == DMA_TO_DEVICE) { | |
3190 | /* read from client */ | |
3191 | rc = h_copy_rdma(buf_len, | |
3192 | vscsi->dds.window[REMOTE].liobn, | |
3193 | client_ioba, | |
3194 | vscsi->dds.window[LOCAL].liobn, | |
3195 | server_ioba); | |
3196 | } else { | |
3197 | /* write to client */ | |
3198 | struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf; | |
3199 | ||
3200 | if (!READ_CMD(srp->cdb)) | |
3201 | print_hex_dump_bytes(" data:", DUMP_PREFIX_NONE, | |
3202 | sg_virt(sgp), buf_len); | |
3203 | /* The h_copy_rdma will cause phyp, running in another | |
3204 | * partition, to read memory, so we need to make sure | |
3205 | * the data has been written out, hence these syncs. | |
3206 | */ | |
3207 | /* ensure that everything is in memory */ | |
3208 | isync(); | |
3209 | /* ensure that memory has been made visible */ | |
3210 | dma_wmb(); | |
3211 | rc = h_copy_rdma(buf_len, | |
3212 | vscsi->dds.window[LOCAL].liobn, | |
3213 | server_ioba, | |
3214 | vscsi->dds.window[REMOTE].liobn, | |
3215 | client_ioba); | |
3216 | } | |
3217 | switch (rc) { | |
3218 | case H_SUCCESS: | |
3219 | break; | |
3220 | case H_PERMISSION: | |
3221 | case H_SOURCE_PARM: | |
3222 | case H_DEST_PARM: | |
3223 | if (connection_broken(vscsi)) { | |
3224 | spin_lock_bh(&vscsi->intr_lock); | |
3225 | vscsi->flags |= | |
3226 | (RESPONSE_Q_DOWN | CLIENT_FAILED); | |
3227 | spin_unlock_bh(&vscsi->intr_lock); | |
3228 | } | |
3229 | dev_err(&vscsi->dev, "rdma: h_copy_rdma failed, rc %ld\n", | |
3230 | rc); | |
3231 | break; | |
3232 | ||
3233 | default: | |
3234 | dev_err(&vscsi->dev, "rdma: unknown error %ld from h_copy_rdma\n", | |
3235 | rc); | |
3236 | break; | |
3237 | } | |
3238 | ||
3239 | if (!rc) { | |
3240 | tx_len -= buf_len; | |
3241 | if (tx_len) { | |
3242 | client_len -= buf_len; | |
3243 | if (client_len == 0) | |
3244 | md_idx++; | |
3245 | else | |
3246 | client_ioba += buf_len; | |
3247 | ||
3248 | server_len -= buf_len; | |
3249 | if (server_len == 0) | |
3250 | sgp = sg_next(sgp); | |
3251 | else | |
3252 | server_ioba += buf_len; | |
3253 | } else { | |
3254 | break; | |
3255 | } | |
3256 | } | |
3257 | } while (!rc); | |
3258 | ||
3259 | return rc; | |
3260 | } | |
3261 | ||
3262 | /** | |
3263 | * ibmvscsis_handle_crq() - Handle CRQ | |
3264 | * @data: Pointer to our adapter structure | |
3265 | * | |
3266 | * Read the command elements from the command queue and copy the payloads | |
3267 | * associated with the command elements to local memory and execute the | |
3268 | * SRP requests. | |
3269 | * | |
3270 | * Note: this is an edge triggered interrupt. It can not be shared. | |
3271 | */ | |
3272 | static void ibmvscsis_handle_crq(unsigned long data) | |
3273 | { | |
3274 | struct scsi_info *vscsi = (struct scsi_info *)data; | |
3275 | struct viosrp_crq *crq; | |
3276 | long rc; | |
3277 | bool ack = true; | |
3278 | volatile u8 valid; | |
3279 | ||
3280 | spin_lock_bh(&vscsi->intr_lock); | |
3281 | ||
3282 | pr_debug("got interrupt\n"); | |
3283 | ||
3284 | /* | |
3285 | * if we are in a path where we are waiting for all pending commands | |
3286 | * to complete because we received a transport event and anything in | |
3287 | * the command queue is for a new connection, do nothing | |
3288 | */ | |
3289 | if (TARGET_STOP(vscsi)) { | |
3290 | vio_enable_interrupts(vscsi->dma_dev); | |
3291 | ||
3292 | pr_debug("handle_crq, don't process: flags 0x%x, state 0x%hx\n", | |
3293 | vscsi->flags, vscsi->state); | |
3294 | spin_unlock_bh(&vscsi->intr_lock); | |
3295 | return; | |
3296 | } | |
3297 | ||
3298 | rc = vscsi->flags & SCHEDULE_DISCONNECT; | |
3299 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
3300 | valid = crq->valid; | |
3301 | dma_rmb(); | |
3302 | ||
3303 | while (valid) { | |
3304 | /* | |
3305 | * These are edege triggered interrupts. After dropping out of | |
3306 | * the while loop, the code must check for work since an | |
3307 | * interrupt could be lost, and an elment be left on the queue, | |
3308 | * hence the label. | |
3309 | */ | |
3310 | cmd_work: | |
3311 | vscsi->cmd_q.index = | |
3312 | (vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask; | |
3313 | ||
3314 | if (!rc) { | |
3315 | rc = ibmvscsis_parse_command(vscsi, crq); | |
3316 | } else { | |
3317 | if ((uint)crq->valid == VALID_TRANS_EVENT) { | |
3318 | /* | |
3319 | * must service the transport layer events even | |
3320 | * in an error state, dont break out until all | |
3321 | * the consecutive transport events have been | |
3322 | * processed | |
3323 | */ | |
3324 | rc = ibmvscsis_trans_event(vscsi, crq); | |
3325 | } else if (vscsi->flags & TRANS_EVENT) { | |
3326 | /* | |
3327 | * if a tranport event has occurred leave | |
3328 | * everything but transport events on the queue | |
3329 | */ | |
3330 | pr_debug("handle_crq, ignoring\n"); | |
3331 | ||
3332 | /* | |
3333 | * need to decrement the queue index so we can | |
3334 | * look at the elment again | |
3335 | */ | |
3336 | if (vscsi->cmd_q.index) | |
3337 | vscsi->cmd_q.index -= 1; | |
3338 | else | |
3339 | /* | |
3340 | * index is at 0 it just wrapped. | |
3341 | * have it index last element in q | |
3342 | */ | |
3343 | vscsi->cmd_q.index = vscsi->cmd_q.mask; | |
3344 | break; | |
3345 | } | |
3346 | } | |
3347 | ||
3348 | crq->valid = INVALIDATE_CMD_RESP_EL; | |
3349 | ||
3350 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
3351 | valid = crq->valid; | |
3352 | dma_rmb(); | |
3353 | } | |
3354 | ||
3355 | if (!rc) { | |
3356 | if (ack) { | |
3357 | vio_enable_interrupts(vscsi->dma_dev); | |
3358 | ack = false; | |
3359 | pr_debug("handle_crq, reenabling interrupts\n"); | |
3360 | } | |
3361 | valid = crq->valid; | |
3362 | dma_rmb(); | |
3363 | if (valid) | |
3364 | goto cmd_work; | |
3365 | } else { | |
3366 | pr_debug("handle_crq, error: flags 0x%x, state 0x%hx, crq index 0x%x\n", | |
3367 | vscsi->flags, vscsi->state, vscsi->cmd_q.index); | |
3368 | } | |
3369 | ||
3370 | pr_debug("Leaving handle_crq: schedule_q empty %d, flags 0x%x, state 0x%hx\n", | |
3371 | (int)list_empty(&vscsi->schedule_q), vscsi->flags, | |
3372 | vscsi->state); | |
3373 | ||
3374 | spin_unlock_bh(&vscsi->intr_lock); | |
3375 | } | |
3376 | ||
3377 | static int ibmvscsis_probe(struct vio_dev *vdev, | |
3378 | const struct vio_device_id *id) | |
3379 | { | |
3380 | struct scsi_info *vscsi; | |
3381 | int rc = 0; | |
3382 | long hrc = 0; | |
3383 | char wq_name[24]; | |
3384 | ||
3385 | vscsi = kzalloc(sizeof(*vscsi), GFP_KERNEL); | |
3386 | if (!vscsi) { | |
3387 | rc = -ENOMEM; | |
3388 | pr_err("probe: allocation of adapter failed\n"); | |
3389 | return rc; | |
3390 | } | |
3391 | ||
3392 | vscsi->dma_dev = vdev; | |
3393 | vscsi->dev = vdev->dev; | |
3394 | INIT_LIST_HEAD(&vscsi->schedule_q); | |
3395 | INIT_LIST_HEAD(&vscsi->waiting_rsp); | |
3396 | INIT_LIST_HEAD(&vscsi->active_q); | |
3397 | ||
3398 | snprintf(vscsi->tport.tport_name, 256, "%s", dev_name(&vdev->dev)); | |
3399 | ||
3400 | pr_debug("probe tport_name: %s\n", vscsi->tport.tport_name); | |
3401 | ||
3402 | rc = read_dma_window(vscsi); | |
3403 | if (rc) | |
3404 | goto free_adapter; | |
3405 | pr_debug("Probe: liobn 0x%x, riobn 0x%x\n", | |
3406 | vscsi->dds.window[LOCAL].liobn, | |
3407 | vscsi->dds.window[REMOTE].liobn); | |
3408 | ||
3409 | strcpy(vscsi->eye, "VSCSI "); | |
3410 | strncat(vscsi->eye, vdev->name, MAX_EYE); | |
3411 | ||
3412 | vscsi->dds.unit_id = vdev->unit_address; | |
3413 | ||
3414 | spin_lock_bh(&ibmvscsis_dev_lock); | |
3415 | list_add_tail(&vscsi->list, &ibmvscsis_dev_list); | |
3416 | spin_unlock_bh(&ibmvscsis_dev_lock); | |
3417 | ||
3418 | /* | |
3419 | * TBD: How do we determine # of cmds to request? Do we know how | |
3420 | * many "children" we have? | |
3421 | */ | |
3422 | vscsi->request_limit = INITIAL_SRP_LIMIT; | |
3423 | rc = srp_target_alloc(&vscsi->target, &vdev->dev, vscsi->request_limit, | |
3424 | SRP_MAX_IU_LEN); | |
3425 | if (rc) | |
3426 | goto rem_list; | |
3427 | ||
3428 | vscsi->target.ldata = vscsi; | |
3429 | ||
3430 | rc = ibmvscsis_alloc_cmds(vscsi, vscsi->request_limit); | |
3431 | if (rc) { | |
3432 | dev_err(&vscsi->dev, "alloc_cmds failed, rc %d, num %d\n", | |
3433 | rc, vscsi->request_limit); | |
3434 | goto free_target; | |
3435 | } | |
3436 | ||
3437 | /* | |
3438 | * Note: the lock is used in freeing timers, so must initialize | |
3439 | * first so that ordering in case of error is correct. | |
3440 | */ | |
3441 | spin_lock_init(&vscsi->intr_lock); | |
3442 | ||
3443 | rc = ibmvscsis_alloctimer(vscsi); | |
3444 | if (rc) { | |
3445 | dev_err(&vscsi->dev, "probe: alloctimer failed, rc %d\n", rc); | |
3446 | goto free_cmds; | |
3447 | } | |
3448 | ||
3449 | rc = ibmvscsis_create_command_q(vscsi, 256); | |
3450 | if (rc) { | |
3451 | dev_err(&vscsi->dev, "probe: create_command_q failed, rc %d\n", | |
3452 | rc); | |
3453 | goto free_timer; | |
3454 | } | |
3455 | ||
3456 | vscsi->map_buf = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
3457 | if (!vscsi->map_buf) { | |
3458 | rc = -ENOMEM; | |
3459 | dev_err(&vscsi->dev, "probe: allocating cmd buffer failed\n"); | |
3460 | goto destroy_queue; | |
3461 | } | |
3462 | ||
3463 | vscsi->map_ioba = dma_map_single(&vdev->dev, vscsi->map_buf, PAGE_SIZE, | |
3464 | DMA_BIDIRECTIONAL); | |
3465 | if (dma_mapping_error(&vdev->dev, vscsi->map_ioba)) { | |
3466 | dev_err(&vscsi->dev, "probe: error mapping command buffer\n"); | |
3467 | goto free_buf; | |
3468 | } | |
3469 | ||
3470 | hrc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO, | |
3471 | (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0, | |
3472 | 0); | |
3473 | if (hrc == H_SUCCESS) | |
3474 | vscsi->client_data.partition_number = | |
3475 | be64_to_cpu(*(u64 *)vscsi->map_buf); | |
3476 | /* | |
3477 | * We expect the VIOCTL to fail if we're configured as "any | |
3478 | * client can connect" and the client isn't activated yet. | |
3479 | * We'll make the call again when he sends an init msg. | |
3480 | */ | |
3481 | pr_debug("probe hrc %ld, client partition num %d\n", | |
3482 | hrc, vscsi->client_data.partition_number); | |
3483 | ||
3484 | tasklet_init(&vscsi->work_task, ibmvscsis_handle_crq, | |
3485 | (unsigned long)vscsi); | |
3486 | ||
3487 | init_completion(&vscsi->wait_idle); | |
3488 | ||
3489 | snprintf(wq_name, 24, "ibmvscsis%s", dev_name(&vdev->dev)); | |
3490 | vscsi->work_q = create_workqueue(wq_name); | |
3491 | if (!vscsi->work_q) { | |
3492 | rc = -ENOMEM; | |
3493 | dev_err(&vscsi->dev, "create_workqueue failed\n"); | |
3494 | goto unmap_buf; | |
3495 | } | |
3496 | ||
3497 | rc = request_irq(vdev->irq, ibmvscsis_interrupt, 0, "ibmvscsis", vscsi); | |
3498 | if (rc) { | |
3499 | rc = -EPERM; | |
3500 | dev_err(&vscsi->dev, "probe: request_irq failed, rc %d\n", rc); | |
3501 | goto destroy_WQ; | |
3502 | } | |
3503 | ||
3504 | spin_lock_bh(&vscsi->intr_lock); | |
3505 | vio_enable_interrupts(vdev); | |
3506 | if (rc) { | |
3507 | dev_err(&vscsi->dev, "enabling interrupts failed, rc %d\n", rc); | |
3508 | rc = -ENODEV; | |
3509 | spin_unlock_bh(&vscsi->intr_lock); | |
3510 | goto free_irq; | |
3511 | } | |
3512 | ||
3513 | if (ibmvscsis_check_q(vscsi)) { | |
3514 | rc = ERROR; | |
3515 | dev_err(&vscsi->dev, "probe: check_q failed, rc %d\n", rc); | |
3516 | spin_unlock_bh(&vscsi->intr_lock); | |
3517 | goto disable_interrupt; | |
3518 | } | |
3519 | spin_unlock_bh(&vscsi->intr_lock); | |
3520 | ||
3521 | dev_set_drvdata(&vdev->dev, vscsi); | |
3522 | ||
3523 | return 0; | |
3524 | ||
3525 | disable_interrupt: | |
3526 | vio_disable_interrupts(vdev); | |
3527 | free_irq: | |
3528 | free_irq(vdev->irq, vscsi); | |
3529 | destroy_WQ: | |
3530 | destroy_workqueue(vscsi->work_q); | |
3531 | unmap_buf: | |
3532 | dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE, | |
3533 | DMA_BIDIRECTIONAL); | |
3534 | free_buf: | |
3535 | kfree(vscsi->map_buf); | |
3536 | destroy_queue: | |
3537 | tasklet_kill(&vscsi->work_task); | |
3538 | ibmvscsis_unregister_command_q(vscsi); | |
3539 | ibmvscsis_destroy_command_q(vscsi); | |
3540 | free_timer: | |
3541 | ibmvscsis_freetimer(vscsi); | |
3542 | free_cmds: | |
3543 | ibmvscsis_free_cmds(vscsi); | |
3544 | free_target: | |
3545 | srp_target_free(&vscsi->target); | |
3546 | rem_list: | |
3547 | spin_lock_bh(&ibmvscsis_dev_lock); | |
3548 | list_del(&vscsi->list); | |
3549 | spin_unlock_bh(&ibmvscsis_dev_lock); | |
3550 | free_adapter: | |
3551 | kfree(vscsi); | |
3552 | ||
3553 | return rc; | |
3554 | } | |
3555 | ||
3556 | static int ibmvscsis_remove(struct vio_dev *vdev) | |
3557 | { | |
3558 | struct scsi_info *vscsi = dev_get_drvdata(&vdev->dev); | |
3559 | ||
3560 | pr_debug("remove (%s)\n", dev_name(&vscsi->dma_dev->dev)); | |
3561 | ||
3562 | /* | |
3563 | * TBD: Need to handle if there are commands on the waiting_rsp q | |
3564 | * Actually, can there still be cmds outstanding to tcm? | |
3565 | */ | |
3566 | ||
3567 | vio_disable_interrupts(vdev); | |
3568 | free_irq(vdev->irq, vscsi); | |
3569 | destroy_workqueue(vscsi->work_q); | |
3570 | dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE, | |
3571 | DMA_BIDIRECTIONAL); | |
3572 | kfree(vscsi->map_buf); | |
3573 | tasklet_kill(&vscsi->work_task); | |
3574 | ibmvscsis_unregister_command_q(vscsi); | |
3575 | ibmvscsis_destroy_command_q(vscsi); | |
3576 | ibmvscsis_freetimer(vscsi); | |
3577 | ibmvscsis_free_cmds(vscsi); | |
3578 | srp_target_free(&vscsi->target); | |
3579 | spin_lock_bh(&ibmvscsis_dev_lock); | |
3580 | list_del(&vscsi->list); | |
3581 | spin_unlock_bh(&ibmvscsis_dev_lock); | |
3582 | kfree(vscsi); | |
3583 | ||
3584 | return 0; | |
3585 | } | |
3586 | ||
3587 | static ssize_t system_id_show(struct device *dev, | |
3588 | struct device_attribute *attr, char *buf) | |
3589 | { | |
3590 | return snprintf(buf, PAGE_SIZE, "%s\n", system_id); | |
3591 | } | |
3592 | ||
3593 | static ssize_t partition_number_show(struct device *dev, | |
3594 | struct device_attribute *attr, char *buf) | |
3595 | { | |
3596 | return snprintf(buf, PAGE_SIZE, "%x\n", partition_number); | |
3597 | } | |
3598 | ||
3599 | static ssize_t unit_address_show(struct device *dev, | |
3600 | struct device_attribute *attr, char *buf) | |
3601 | { | |
3602 | struct scsi_info *vscsi = container_of(dev, struct scsi_info, dev); | |
3603 | ||
3604 | return snprintf(buf, PAGE_SIZE, "%x\n", vscsi->dma_dev->unit_address); | |
3605 | } | |
3606 | ||
3607 | static int ibmvscsis_get_system_info(void) | |
3608 | { | |
3609 | struct device_node *rootdn, *vdevdn; | |
3610 | const char *id, *model, *name; | |
3611 | const uint *num; | |
3612 | ||
3613 | rootdn = of_find_node_by_path("/"); | |
3614 | if (!rootdn) | |
3615 | return -ENOENT; | |
3616 | ||
3617 | model = of_get_property(rootdn, "model", NULL); | |
3618 | id = of_get_property(rootdn, "system-id", NULL); | |
3619 | if (model && id) | |
3620 | snprintf(system_id, sizeof(system_id), "%s-%s", model, id); | |
3621 | ||
3622 | name = of_get_property(rootdn, "ibm,partition-name", NULL); | |
3623 | if (name) | |
3624 | strncpy(partition_name, name, sizeof(partition_name)); | |
3625 | ||
3626 | num = of_get_property(rootdn, "ibm,partition-no", NULL); | |
3627 | if (num) | |
3628 | partition_number = *num; | |
3629 | ||
3630 | of_node_put(rootdn); | |
3631 | ||
3632 | vdevdn = of_find_node_by_path("/vdevice"); | |
3633 | if (vdevdn) { | |
3634 | const uint *mvds; | |
3635 | ||
3636 | mvds = of_get_property(vdevdn, "ibm,max-virtual-dma-size", | |
3637 | NULL); | |
3638 | if (mvds) | |
3639 | max_vdma_size = *mvds; | |
3640 | of_node_put(vdevdn); | |
3641 | } | |
3642 | ||
3643 | return 0; | |
3644 | } | |
3645 | ||
3646 | static char *ibmvscsis_get_fabric_name(void) | |
3647 | { | |
3648 | return "ibmvscsis"; | |
3649 | } | |
3650 | ||
3651 | static char *ibmvscsis_get_fabric_wwn(struct se_portal_group *se_tpg) | |
3652 | { | |
3653 | struct ibmvscsis_tport *tport = | |
3654 | container_of(se_tpg, struct ibmvscsis_tport, se_tpg); | |
3655 | ||
3656 | return tport->tport_name; | |
3657 | } | |
3658 | ||
3659 | static u16 ibmvscsis_get_tag(struct se_portal_group *se_tpg) | |
3660 | { | |
3661 | struct ibmvscsis_tport *tport = | |
3662 | container_of(se_tpg, struct ibmvscsis_tport, se_tpg); | |
3663 | ||
3664 | return tport->tport_tpgt; | |
3665 | } | |
3666 | ||
3667 | static u32 ibmvscsis_get_default_depth(struct se_portal_group *se_tpg) | |
3668 | { | |
3669 | return 1; | |
3670 | } | |
3671 | ||
3672 | static int ibmvscsis_check_true(struct se_portal_group *se_tpg) | |
3673 | { | |
3674 | return 1; | |
3675 | } | |
3676 | ||
3677 | static int ibmvscsis_check_false(struct se_portal_group *se_tpg) | |
3678 | { | |
3679 | return 0; | |
3680 | } | |
3681 | ||
3682 | static u32 ibmvscsis_tpg_get_inst_index(struct se_portal_group *se_tpg) | |
3683 | { | |
3684 | return 1; | |
3685 | } | |
3686 | ||
3687 | static int ibmvscsis_check_stop_free(struct se_cmd *se_cmd) | |
3688 | { | |
3689 | return target_put_sess_cmd(se_cmd); | |
3690 | } | |
3691 | ||
3692 | static void ibmvscsis_release_cmd(struct se_cmd *se_cmd) | |
3693 | { | |
3694 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3695 | se_cmd); | |
3696 | struct scsi_info *vscsi = cmd->adapter; | |
3697 | ||
3698 | pr_debug("release_cmd %p, flags %d\n", se_cmd, cmd->flags); | |
3699 | ||
3700 | spin_lock_bh(&vscsi->intr_lock); | |
3701 | /* Remove from active_q */ | |
980b3271 | 3702 | list_move_tail(&cmd->list, &vscsi->waiting_rsp); |
88a678bb BL |
3703 | ibmvscsis_send_messages(vscsi); |
3704 | spin_unlock_bh(&vscsi->intr_lock); | |
3705 | } | |
3706 | ||
3707 | static u32 ibmvscsis_sess_get_index(struct se_session *se_sess) | |
3708 | { | |
3709 | return 0; | |
3710 | } | |
3711 | ||
3712 | static int ibmvscsis_write_pending(struct se_cmd *se_cmd) | |
3713 | { | |
3714 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3715 | se_cmd); | |
3716 | struct iu_entry *iue = cmd->iue; | |
3717 | int rc; | |
3718 | ||
3719 | pr_debug("write_pending, se_cmd %p, length 0x%x\n", | |
3720 | se_cmd, se_cmd->data_length); | |
3721 | ||
3722 | rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma, | |
3723 | 1, 1); | |
3724 | if (rc) { | |
3725 | pr_err("srp_transfer_data() failed: %d\n", rc); | |
3726 | return -EAGAIN; | |
3727 | } | |
3728 | /* | |
3729 | * We now tell TCM to add this WRITE CDB directly into the TCM storage | |
3730 | * object execution queue. | |
3731 | */ | |
3732 | target_execute_cmd(se_cmd); | |
3733 | return 0; | |
3734 | } | |
3735 | ||
3736 | static int ibmvscsis_write_pending_status(struct se_cmd *se_cmd) | |
3737 | { | |
3738 | return 0; | |
3739 | } | |
3740 | ||
3741 | static void ibmvscsis_set_default_node_attrs(struct se_node_acl *nacl) | |
3742 | { | |
3743 | } | |
3744 | ||
3745 | static int ibmvscsis_get_cmd_state(struct se_cmd *se_cmd) | |
3746 | { | |
3747 | return 0; | |
3748 | } | |
3749 | ||
3750 | static int ibmvscsis_queue_data_in(struct se_cmd *se_cmd) | |
3751 | { | |
3752 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3753 | se_cmd); | |
3754 | struct iu_entry *iue = cmd->iue; | |
3755 | struct scsi_info *vscsi = cmd->adapter; | |
3756 | char *sd; | |
3757 | uint len = 0; | |
3758 | int rc; | |
3759 | ||
3760 | pr_debug("queue_data_in, se_cmd %p, length 0x%x\n", | |
3761 | se_cmd, se_cmd->data_length); | |
3762 | ||
3763 | rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma, 1, | |
3764 | 1); | |
3765 | if (rc) { | |
3766 | pr_err("srp_transfer_data failed: %d\n", rc); | |
3767 | sd = se_cmd->sense_buffer; | |
3768 | se_cmd->scsi_sense_length = 18; | |
3769 | memset(se_cmd->sense_buffer, 0, se_cmd->scsi_sense_length); | |
3770 | /* Logical Unit Communication Time-out asc/ascq = 0x0801 */ | |
3771 | scsi_build_sense_buffer(0, se_cmd->sense_buffer, MEDIUM_ERROR, | |
3772 | 0x08, 0x01); | |
3773 | } | |
3774 | ||
3775 | srp_build_response(vscsi, cmd, &len); | |
3776 | cmd->rsp.format = SRP_FORMAT; | |
3777 | cmd->rsp.len = len; | |
3778 | ||
3779 | return 0; | |
3780 | } | |
3781 | ||
3782 | static int ibmvscsis_queue_status(struct se_cmd *se_cmd) | |
3783 | { | |
3784 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3785 | se_cmd); | |
3786 | struct scsi_info *vscsi = cmd->adapter; | |
3787 | uint len; | |
3788 | ||
3789 | pr_debug("queue_status %p\n", se_cmd); | |
3790 | ||
3791 | srp_build_response(vscsi, cmd, &len); | |
3792 | cmd->rsp.format = SRP_FORMAT; | |
3793 | cmd->rsp.len = len; | |
3794 | ||
3795 | return 0; | |
3796 | } | |
3797 | ||
3798 | static void ibmvscsis_queue_tm_rsp(struct se_cmd *se_cmd) | |
3799 | { | |
3800 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3801 | se_cmd); | |
3802 | struct scsi_info *vscsi = cmd->adapter; | |
3803 | uint len; | |
3804 | ||
3805 | pr_debug("queue_tm_rsp %p, status %d\n", | |
3806 | se_cmd, (int)se_cmd->se_tmr_req->response); | |
3807 | ||
3808 | srp_build_response(vscsi, cmd, &len); | |
3809 | cmd->rsp.format = SRP_FORMAT; | |
3810 | cmd->rsp.len = len; | |
3811 | } | |
3812 | ||
3813 | static void ibmvscsis_aborted_task(struct se_cmd *se_cmd) | |
3814 | { | |
3815 | /* TBD: What (if anything) should we do here? */ | |
3816 | pr_debug("ibmvscsis_aborted_task %p\n", se_cmd); | |
3817 | } | |
3818 | ||
3819 | static struct se_wwn *ibmvscsis_make_tport(struct target_fabric_configfs *tf, | |
3820 | struct config_group *group, | |
3821 | const char *name) | |
3822 | { | |
3823 | struct ibmvscsis_tport *tport; | |
3824 | ||
3825 | tport = ibmvscsis_lookup_port(name); | |
3826 | if (tport) { | |
3827 | tport->tport_proto_id = SCSI_PROTOCOL_SRP; | |
3828 | pr_debug("make_tport(%s), pointer:%p, tport_id:%x\n", | |
3829 | name, tport, tport->tport_proto_id); | |
3830 | return &tport->tport_wwn; | |
3831 | } | |
3832 | ||
3833 | return ERR_PTR(-EINVAL); | |
3834 | } | |
3835 | ||
3836 | static void ibmvscsis_drop_tport(struct se_wwn *wwn) | |
3837 | { | |
3838 | struct ibmvscsis_tport *tport = container_of(wwn, | |
3839 | struct ibmvscsis_tport, | |
3840 | tport_wwn); | |
3841 | ||
3842 | pr_debug("drop_tport(%s)\n", | |
3843 | config_item_name(&tport->tport_wwn.wwn_group.cg_item)); | |
3844 | } | |
3845 | ||
3846 | static struct se_portal_group *ibmvscsis_make_tpg(struct se_wwn *wwn, | |
3847 | struct config_group *group, | |
3848 | const char *name) | |
3849 | { | |
3850 | struct ibmvscsis_tport *tport = | |
3851 | container_of(wwn, struct ibmvscsis_tport, tport_wwn); | |
3852 | int rc; | |
3853 | ||
3854 | tport->releasing = false; | |
3855 | ||
3856 | rc = core_tpg_register(&tport->tport_wwn, &tport->se_tpg, | |
3857 | tport->tport_proto_id); | |
3858 | if (rc) | |
3859 | return ERR_PTR(rc); | |
3860 | ||
3861 | return &tport->se_tpg; | |
3862 | } | |
3863 | ||
3864 | static void ibmvscsis_drop_tpg(struct se_portal_group *se_tpg) | |
3865 | { | |
3866 | struct ibmvscsis_tport *tport = container_of(se_tpg, | |
3867 | struct ibmvscsis_tport, | |
3868 | se_tpg); | |
3869 | ||
3870 | tport->releasing = true; | |
3871 | tport->enabled = false; | |
3872 | ||
3873 | /* | |
3874 | * Release the virtual I_T Nexus for this ibmvscsis TPG | |
3875 | */ | |
3876 | ibmvscsis_drop_nexus(tport); | |
3877 | /* | |
3878 | * Deregister the se_tpg from TCM.. | |
3879 | */ | |
3880 | core_tpg_deregister(se_tpg); | |
3881 | } | |
3882 | ||
3883 | static ssize_t ibmvscsis_wwn_version_show(struct config_item *item, | |
3884 | char *page) | |
3885 | { | |
3886 | return scnprintf(page, PAGE_SIZE, "%s\n", IBMVSCSIS_VERSION); | |
3887 | } | |
3888 | CONFIGFS_ATTR_RO(ibmvscsis_wwn_, version); | |
3889 | ||
3890 | static struct configfs_attribute *ibmvscsis_wwn_attrs[] = { | |
3891 | &ibmvscsis_wwn_attr_version, | |
3892 | NULL, | |
3893 | }; | |
3894 | ||
3895 | static ssize_t ibmvscsis_tpg_enable_show(struct config_item *item, | |
3896 | char *page) | |
3897 | { | |
3898 | struct se_portal_group *se_tpg = to_tpg(item); | |
3899 | struct ibmvscsis_tport *tport = container_of(se_tpg, | |
3900 | struct ibmvscsis_tport, | |
3901 | se_tpg); | |
3902 | ||
3903 | return snprintf(page, PAGE_SIZE, "%d\n", (tport->enabled) ? 1 : 0); | |
3904 | } | |
3905 | ||
3906 | static ssize_t ibmvscsis_tpg_enable_store(struct config_item *item, | |
3907 | const char *page, size_t count) | |
3908 | { | |
3909 | struct se_portal_group *se_tpg = to_tpg(item); | |
3910 | struct ibmvscsis_tport *tport = container_of(se_tpg, | |
3911 | struct ibmvscsis_tport, | |
3912 | se_tpg); | |
3913 | struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport); | |
3914 | unsigned long tmp; | |
3915 | int rc; | |
3916 | long lrc; | |
3917 | ||
3918 | rc = kstrtoul(page, 0, &tmp); | |
3919 | if (rc < 0) { | |
3920 | pr_err("Unable to extract srpt_tpg_store_enable\n"); | |
3921 | return -EINVAL; | |
3922 | } | |
3923 | ||
3924 | if ((tmp != 0) && (tmp != 1)) { | |
3925 | pr_err("Illegal value for srpt_tpg_store_enable\n"); | |
3926 | return -EINVAL; | |
3927 | } | |
3928 | ||
3929 | if (tmp) { | |
3930 | tport->enabled = true; | |
3931 | spin_lock_bh(&vscsi->intr_lock); | |
3932 | lrc = ibmvscsis_enable_change_state(vscsi); | |
3933 | if (lrc) | |
3934 | pr_err("enable_change_state failed, rc %ld state %d\n", | |
3935 | lrc, vscsi->state); | |
3936 | spin_unlock_bh(&vscsi->intr_lock); | |
3937 | } else { | |
3938 | tport->enabled = false; | |
3939 | } | |
3940 | ||
3941 | pr_debug("tpg_enable_store, state %d\n", vscsi->state); | |
3942 | ||
3943 | return count; | |
3944 | } | |
3945 | CONFIGFS_ATTR(ibmvscsis_tpg_, enable); | |
3946 | ||
3947 | static struct configfs_attribute *ibmvscsis_tpg_attrs[] = { | |
3948 | &ibmvscsis_tpg_attr_enable, | |
3949 | NULL, | |
3950 | }; | |
3951 | ||
3952 | static const struct target_core_fabric_ops ibmvscsis_ops = { | |
3953 | .module = THIS_MODULE, | |
3954 | .name = "ibmvscsis", | |
3955 | .get_fabric_name = ibmvscsis_get_fabric_name, | |
3956 | .tpg_get_wwn = ibmvscsis_get_fabric_wwn, | |
3957 | .tpg_get_tag = ibmvscsis_get_tag, | |
3958 | .tpg_get_default_depth = ibmvscsis_get_default_depth, | |
3959 | .tpg_check_demo_mode = ibmvscsis_check_true, | |
3960 | .tpg_check_demo_mode_cache = ibmvscsis_check_true, | |
3961 | .tpg_check_demo_mode_write_protect = ibmvscsis_check_false, | |
3962 | .tpg_check_prod_mode_write_protect = ibmvscsis_check_false, | |
3963 | .tpg_get_inst_index = ibmvscsis_tpg_get_inst_index, | |
3964 | .check_stop_free = ibmvscsis_check_stop_free, | |
3965 | .release_cmd = ibmvscsis_release_cmd, | |
3966 | .sess_get_index = ibmvscsis_sess_get_index, | |
3967 | .write_pending = ibmvscsis_write_pending, | |
3968 | .write_pending_status = ibmvscsis_write_pending_status, | |
3969 | .set_default_node_attributes = ibmvscsis_set_default_node_attrs, | |
3970 | .get_cmd_state = ibmvscsis_get_cmd_state, | |
3971 | .queue_data_in = ibmvscsis_queue_data_in, | |
3972 | .queue_status = ibmvscsis_queue_status, | |
3973 | .queue_tm_rsp = ibmvscsis_queue_tm_rsp, | |
3974 | .aborted_task = ibmvscsis_aborted_task, | |
3975 | /* | |
3976 | * Setup function pointers for logic in target_core_fabric_configfs.c | |
3977 | */ | |
3978 | .fabric_make_wwn = ibmvscsis_make_tport, | |
3979 | .fabric_drop_wwn = ibmvscsis_drop_tport, | |
3980 | .fabric_make_tpg = ibmvscsis_make_tpg, | |
3981 | .fabric_drop_tpg = ibmvscsis_drop_tpg, | |
3982 | ||
3983 | .tfc_wwn_attrs = ibmvscsis_wwn_attrs, | |
3984 | .tfc_tpg_base_attrs = ibmvscsis_tpg_attrs, | |
3985 | }; | |
3986 | ||
3987 | static void ibmvscsis_dev_release(struct device *dev) {}; | |
3988 | ||
3989 | static struct class_attribute ibmvscsis_class_attrs[] = { | |
3990 | __ATTR_NULL, | |
3991 | }; | |
3992 | ||
3993 | static struct device_attribute dev_attr_system_id = | |
3994 | __ATTR(system_id, S_IRUGO, system_id_show, NULL); | |
3995 | ||
3996 | static struct device_attribute dev_attr_partition_number = | |
3997 | __ATTR(partition_number, S_IRUGO, partition_number_show, NULL); | |
3998 | ||
3999 | static struct device_attribute dev_attr_unit_address = | |
4000 | __ATTR(unit_address, S_IRUGO, unit_address_show, NULL); | |
4001 | ||
4002 | static struct attribute *ibmvscsis_dev_attrs[] = { | |
4003 | &dev_attr_system_id.attr, | |
4004 | &dev_attr_partition_number.attr, | |
4005 | &dev_attr_unit_address.attr, | |
4006 | }; | |
4007 | ATTRIBUTE_GROUPS(ibmvscsis_dev); | |
4008 | ||
4009 | static struct class ibmvscsis_class = { | |
4010 | .name = "ibmvscsis", | |
4011 | .dev_release = ibmvscsis_dev_release, | |
4012 | .class_attrs = ibmvscsis_class_attrs, | |
4013 | .dev_groups = ibmvscsis_dev_groups, | |
4014 | }; | |
4015 | ||
4016 | static struct vio_device_id ibmvscsis_device_table[] = { | |
4017 | { "v-scsi-host", "IBM,v-scsi-host" }, | |
4018 | { "", "" } | |
4019 | }; | |
4020 | MODULE_DEVICE_TABLE(vio, ibmvscsis_device_table); | |
4021 | ||
4022 | static struct vio_driver ibmvscsis_driver = { | |
4023 | .name = "ibmvscsis", | |
4024 | .id_table = ibmvscsis_device_table, | |
4025 | .probe = ibmvscsis_probe, | |
4026 | .remove = ibmvscsis_remove, | |
4027 | }; | |
4028 | ||
4029 | /* | |
4030 | * ibmvscsis_init() - Kernel Module initialization | |
4031 | * | |
4032 | * Note: vio_register_driver() registers callback functions, and at least one | |
4033 | * of those callback functions calls TCM - Linux IO Target Subsystem, thus | |
4034 | * the SCSI Target template must be registered before vio_register_driver() | |
4035 | * is called. | |
4036 | */ | |
4037 | static int __init ibmvscsis_init(void) | |
4038 | { | |
4039 | int rc = 0; | |
4040 | ||
4041 | rc = ibmvscsis_get_system_info(); | |
4042 | if (rc) { | |
4043 | pr_err("rc %d from get_system_info\n", rc); | |
4044 | goto out; | |
4045 | } | |
4046 | ||
4047 | rc = class_register(&ibmvscsis_class); | |
4048 | if (rc) { | |
4049 | pr_err("failed class register\n"); | |
4050 | goto out; | |
4051 | } | |
4052 | ||
4053 | rc = target_register_template(&ibmvscsis_ops); | |
4054 | if (rc) { | |
4055 | pr_err("rc %d from target_register_template\n", rc); | |
4056 | goto unregister_class; | |
4057 | } | |
4058 | ||
4059 | rc = vio_register_driver(&ibmvscsis_driver); | |
4060 | if (rc) { | |
4061 | pr_err("rc %d from vio_register_driver\n", rc); | |
4062 | goto unregister_target; | |
4063 | } | |
4064 | ||
4065 | return 0; | |
4066 | ||
4067 | unregister_target: | |
4068 | target_unregister_template(&ibmvscsis_ops); | |
4069 | unregister_class: | |
4070 | class_unregister(&ibmvscsis_class); | |
4071 | out: | |
4072 | return rc; | |
4073 | } | |
4074 | ||
4075 | static void __exit ibmvscsis_exit(void) | |
4076 | { | |
4077 | pr_info("Unregister IBM virtual SCSI host driver\n"); | |
4078 | vio_unregister_driver(&ibmvscsis_driver); | |
4079 | target_unregister_template(&ibmvscsis_ops); | |
4080 | class_unregister(&ibmvscsis_class); | |
4081 | } | |
4082 | ||
4083 | MODULE_DESCRIPTION("IBMVSCSIS fabric driver"); | |
4084 | MODULE_AUTHOR("Bryant G. Ly and Michael Cyr"); | |
4085 | MODULE_LICENSE("GPL"); | |
4086 | MODULE_VERSION(IBMVSCSIS_VERSION); | |
4087 | module_init(ibmvscsis_init); | |
4088 | module_exit(ibmvscsis_exit); |