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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 | ||
79fac9c9 | 25 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
88a678bb BL |
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> | |
e9409b26 | 33 | #include <linux/delay.h> |
88a678bb BL |
34 | |
35 | #include <target/target_core_base.h> | |
36 | #include <target/target_core_fabric.h> | |
37 | ||
38 | #include <asm/hvcall.h> | |
39 | #include <asm/vio.h> | |
40 | ||
41 | #include <scsi/viosrp.h> | |
42 | ||
43 | #include "ibmvscsi_tgt.h" | |
44 | ||
45 | #define IBMVSCSIS_VERSION "v0.2" | |
46 | ||
47 | #define INITIAL_SRP_LIMIT 800 | |
48 | #define DEFAULT_MAX_SECTORS 256 | |
49 | ||
50 | static uint max_vdma_size = MAX_H_COPY_RDMA; | |
51 | ||
52 | static char system_id[SYS_ID_NAME_LEN] = ""; | |
53 | static char partition_name[PARTITION_NAMELEN] = "UNKNOWN"; | |
54 | static uint partition_number = -1; | |
55 | ||
56 | /* Adapter list and lock to control it */ | |
57 | static DEFINE_SPINLOCK(ibmvscsis_dev_lock); | |
58 | static LIST_HEAD(ibmvscsis_dev_list); | |
59 | ||
60 | static long ibmvscsis_parse_command(struct scsi_info *vscsi, | |
61 | struct viosrp_crq *crq); | |
62 | ||
63 | static void ibmvscsis_adapter_idle(struct scsi_info *vscsi); | |
64 | ||
65 | static void ibmvscsis_determine_resid(struct se_cmd *se_cmd, | |
66 | struct srp_rsp *rsp) | |
67 | { | |
68 | u32 residual_count = se_cmd->residual_count; | |
69 | ||
70 | if (!residual_count) | |
71 | return; | |
72 | ||
73 | if (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { | |
74 | if (se_cmd->data_direction == DMA_TO_DEVICE) { | |
75 | /* residual data from an underflow write */ | |
76 | rsp->flags = SRP_RSP_FLAG_DOUNDER; | |
77 | rsp->data_out_res_cnt = cpu_to_be32(residual_count); | |
78 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { | |
79 | /* residual data from an underflow read */ | |
80 | rsp->flags = SRP_RSP_FLAG_DIUNDER; | |
81 | rsp->data_in_res_cnt = cpu_to_be32(residual_count); | |
82 | } | |
83 | } else if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
84 | if (se_cmd->data_direction == DMA_TO_DEVICE) { | |
79fac9c9 | 85 | /* residual data from an overflow write */ |
88a678bb BL |
86 | rsp->flags = SRP_RSP_FLAG_DOOVER; |
87 | rsp->data_out_res_cnt = cpu_to_be32(residual_count); | |
88 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { | |
89 | /* residual data from an overflow read */ | |
90 | rsp->flags = SRP_RSP_FLAG_DIOVER; | |
91 | rsp->data_in_res_cnt = cpu_to_be32(residual_count); | |
92 | } | |
93 | } | |
94 | } | |
95 | ||
96 | /** | |
97 | * connection_broken() - Determine if the connection to the client is good | |
98 | * @vscsi: Pointer to our adapter structure | |
99 | * | |
100 | * This function attempts to send a ping MAD to the client. If the call to | |
101 | * queue the request returns H_CLOSED then the connection has been broken | |
102 | * and the function returns TRUE. | |
103 | * | |
104 | * EXECUTION ENVIRONMENT: | |
79fac9c9 | 105 | * Interrupt or Process environment |
88a678bb BL |
106 | */ |
107 | static bool connection_broken(struct scsi_info *vscsi) | |
108 | { | |
109 | struct viosrp_crq *crq; | |
110 | u64 buffer[2] = { 0, 0 }; | |
111 | long h_return_code; | |
112 | bool rc = false; | |
113 | ||
114 | /* create a PING crq */ | |
115 | crq = (struct viosrp_crq *)&buffer; | |
116 | crq->valid = VALID_CMD_RESP_EL; | |
117 | crq->format = MESSAGE_IN_CRQ; | |
118 | crq->status = PING; | |
119 | ||
120 | h_return_code = h_send_crq(vscsi->dds.unit_id, | |
121 | cpu_to_be64(buffer[MSG_HI]), | |
122 | cpu_to_be64(buffer[MSG_LOW])); | |
123 | ||
124 | pr_debug("connection_broken: rc %ld\n", h_return_code); | |
125 | ||
126 | if (h_return_code == H_CLOSED) | |
127 | rc = true; | |
128 | ||
129 | return rc; | |
130 | } | |
131 | ||
132 | /** | |
133 | * ibmvscsis_unregister_command_q() - Helper Function-Unregister Command Queue | |
134 | * @vscsi: Pointer to our adapter structure | |
135 | * | |
136 | * This function calls h_free_q then frees the interrupt bit etc. | |
137 | * It must release the lock before doing so because of the time it can take | |
138 | * for h_free_crq in PHYP | |
139 | * NOTE: the caller must make sure that state and or flags will prevent | |
140 | * interrupt handler from scheduling work. | |
141 | * NOTE: anyone calling this function may need to set the CRQ_CLOSED flag | |
142 | * we can't do it here, because we don't have the lock | |
143 | * | |
144 | * EXECUTION ENVIRONMENT: | |
145 | * Process level | |
146 | */ | |
147 | static long ibmvscsis_unregister_command_q(struct scsi_info *vscsi) | |
148 | { | |
149 | long qrc; | |
150 | long rc = ADAPT_SUCCESS; | |
151 | int ticks = 0; | |
152 | ||
153 | do { | |
154 | qrc = h_free_crq(vscsi->dds.unit_id); | |
155 | switch (qrc) { | |
156 | case H_SUCCESS: | |
157 | break; | |
158 | ||
159 | case H_HARDWARE: | |
160 | case H_PARAMETER: | |
161 | dev_err(&vscsi->dev, "unregister_command_q: error from h_free_crq %ld\n", | |
162 | qrc); | |
163 | rc = ERROR; | |
164 | break; | |
165 | ||
166 | case H_BUSY: | |
167 | case H_LONG_BUSY_ORDER_1_MSEC: | |
168 | /* msleep not good for small values */ | |
169 | usleep_range(1000, 2000); | |
170 | ticks += 1; | |
171 | break; | |
172 | case H_LONG_BUSY_ORDER_10_MSEC: | |
173 | usleep_range(10000, 20000); | |
174 | ticks += 10; | |
175 | break; | |
176 | case H_LONG_BUSY_ORDER_100_MSEC: | |
177 | msleep(100); | |
178 | ticks += 100; | |
179 | break; | |
180 | case H_LONG_BUSY_ORDER_1_SEC: | |
181 | ssleep(1); | |
182 | ticks += 1000; | |
183 | break; | |
184 | case H_LONG_BUSY_ORDER_10_SEC: | |
185 | ssleep(10); | |
186 | ticks += 10000; | |
187 | break; | |
188 | case H_LONG_BUSY_ORDER_100_SEC: | |
189 | ssleep(100); | |
190 | ticks += 100000; | |
191 | break; | |
192 | default: | |
193 | dev_err(&vscsi->dev, "unregister_command_q: unknown error %ld from h_free_crq\n", | |
194 | qrc); | |
195 | rc = ERROR; | |
196 | break; | |
197 | } | |
198 | ||
199 | /* | |
200 | * dont wait more then 300 seconds | |
201 | * ticks are in milliseconds more or less | |
202 | */ | |
203 | if (ticks > 300000 && qrc != H_SUCCESS) { | |
204 | rc = ERROR; | |
205 | dev_err(&vscsi->dev, "Excessive wait for h_free_crq\n"); | |
206 | } | |
207 | } while (qrc != H_SUCCESS && rc == ADAPT_SUCCESS); | |
208 | ||
209 | pr_debug("Freeing CRQ: phyp rc %ld, rc %ld\n", qrc, rc); | |
210 | ||
211 | return rc; | |
212 | } | |
213 | ||
214 | /** | |
215 | * ibmvscsis_delete_client_info() - Helper function to Delete Client Info | |
216 | * @vscsi: Pointer to our adapter structure | |
217 | * @client_closed: True if client closed its queue | |
218 | * | |
219 | * Deletes information specific to the client when the client goes away | |
220 | * | |
221 | * EXECUTION ENVIRONMENT: | |
222 | * Interrupt or Process | |
223 | */ | |
224 | static void ibmvscsis_delete_client_info(struct scsi_info *vscsi, | |
225 | bool client_closed) | |
226 | { | |
227 | vscsi->client_cap = 0; | |
228 | ||
229 | /* | |
230 | * Some things we don't want to clear if we're closing the queue, | |
231 | * because some clients don't resend the host handshake when they | |
232 | * get a transport event. | |
233 | */ | |
234 | if (client_closed) | |
235 | vscsi->client_data.os_type = 0; | |
236 | } | |
237 | ||
238 | /** | |
239 | * ibmvscsis_free_command_q() - Free Command Queue | |
240 | * @vscsi: Pointer to our adapter structure | |
241 | * | |
242 | * This function calls unregister_command_q, then clears interrupts and | |
243 | * any pending interrupt acknowledgments associated with the command q. | |
244 | * It also clears memory if there is no error. | |
245 | * | |
246 | * PHYP did not meet the PAPR architecture so that we must give up the | |
247 | * lock. This causes a timing hole regarding state change. To close the | |
248 | * hole this routine does accounting on any change that occurred during | |
249 | * the time the lock is not held. | |
250 | * NOTE: must give up and then acquire the interrupt lock, the caller must | |
251 | * make sure that state and or flags will prevent interrupt handler from | |
252 | * scheduling work. | |
253 | * | |
254 | * EXECUTION ENVIRONMENT: | |
255 | * Process level, interrupt lock is held | |
256 | */ | |
257 | static long ibmvscsis_free_command_q(struct scsi_info *vscsi) | |
258 | { | |
259 | int bytes; | |
260 | u32 flags_under_lock; | |
261 | u16 state_under_lock; | |
262 | long rc = ADAPT_SUCCESS; | |
263 | ||
264 | if (!(vscsi->flags & CRQ_CLOSED)) { | |
265 | vio_disable_interrupts(vscsi->dma_dev); | |
266 | ||
267 | state_under_lock = vscsi->new_state; | |
268 | flags_under_lock = vscsi->flags; | |
269 | vscsi->phyp_acr_state = 0; | |
270 | vscsi->phyp_acr_flags = 0; | |
271 | ||
272 | spin_unlock_bh(&vscsi->intr_lock); | |
273 | rc = ibmvscsis_unregister_command_q(vscsi); | |
274 | spin_lock_bh(&vscsi->intr_lock); | |
275 | ||
276 | if (state_under_lock != vscsi->new_state) | |
277 | vscsi->phyp_acr_state = vscsi->new_state; | |
278 | ||
279 | vscsi->phyp_acr_flags = ((~flags_under_lock) & vscsi->flags); | |
280 | ||
281 | if (rc == ADAPT_SUCCESS) { | |
282 | bytes = vscsi->cmd_q.size * PAGE_SIZE; | |
283 | memset(vscsi->cmd_q.base_addr, 0, bytes); | |
284 | vscsi->cmd_q.index = 0; | |
285 | vscsi->flags |= CRQ_CLOSED; | |
286 | ||
287 | ibmvscsis_delete_client_info(vscsi, false); | |
288 | } | |
289 | ||
290 | pr_debug("free_command_q: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n", | |
291 | vscsi->flags, vscsi->state, vscsi->phyp_acr_flags, | |
292 | vscsi->phyp_acr_state); | |
293 | } | |
294 | return rc; | |
295 | } | |
296 | ||
297 | /** | |
298 | * ibmvscsis_cmd_q_dequeue() - Get valid Command element | |
299 | * @mask: Mask to use in case index wraps | |
300 | * @current_index: Current index into command queue | |
301 | * @base_addr: Pointer to start of command queue | |
302 | * | |
303 | * Returns a pointer to a valid command element or NULL, if the command | |
304 | * queue is empty | |
305 | * | |
306 | * EXECUTION ENVIRONMENT: | |
307 | * Interrupt environment, interrupt lock held | |
308 | */ | |
309 | static struct viosrp_crq *ibmvscsis_cmd_q_dequeue(uint mask, | |
310 | uint *current_index, | |
311 | struct viosrp_crq *base_addr) | |
312 | { | |
313 | struct viosrp_crq *ptr; | |
314 | ||
315 | ptr = base_addr + *current_index; | |
316 | ||
317 | if (ptr->valid) { | |
318 | *current_index = (*current_index + 1) & mask; | |
319 | dma_rmb(); | |
320 | } else { | |
321 | ptr = NULL; | |
322 | } | |
323 | ||
324 | return ptr; | |
325 | } | |
326 | ||
327 | /** | |
79fac9c9 | 328 | * ibmvscsis_send_init_message() - send initialize message to the client |
88a678bb BL |
329 | * @vscsi: Pointer to our adapter structure |
330 | * @format: Which Init Message format to send | |
331 | * | |
332 | * EXECUTION ENVIRONMENT: | |
333 | * Interrupt environment interrupt lock held | |
334 | */ | |
335 | static long ibmvscsis_send_init_message(struct scsi_info *vscsi, u8 format) | |
336 | { | |
337 | struct viosrp_crq *crq; | |
338 | u64 buffer[2] = { 0, 0 }; | |
339 | long rc; | |
340 | ||
341 | crq = (struct viosrp_crq *)&buffer; | |
342 | crq->valid = VALID_INIT_MSG; | |
343 | crq->format = format; | |
344 | rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]), | |
345 | cpu_to_be64(buffer[MSG_LOW])); | |
346 | ||
347 | return rc; | |
348 | } | |
349 | ||
350 | /** | |
351 | * ibmvscsis_check_init_msg() - Check init message valid | |
352 | * @vscsi: Pointer to our adapter structure | |
353 | * @format: Pointer to return format of Init Message, if any. | |
354 | * Set to UNUSED_FORMAT if no Init Message in queue. | |
355 | * | |
356 | * Checks if an initialize message was queued by the initiatior | |
357 | * after the queue was created and before the interrupt was enabled. | |
358 | * | |
359 | * EXECUTION ENVIRONMENT: | |
360 | * Process level only, interrupt lock held | |
361 | */ | |
362 | static long ibmvscsis_check_init_msg(struct scsi_info *vscsi, uint *format) | |
363 | { | |
364 | struct viosrp_crq *crq; | |
365 | long rc = ADAPT_SUCCESS; | |
366 | ||
367 | crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask, &vscsi->cmd_q.index, | |
368 | vscsi->cmd_q.base_addr); | |
369 | if (!crq) { | |
370 | *format = (uint)UNUSED_FORMAT; | |
371 | } else if (crq->valid == VALID_INIT_MSG && crq->format == INIT_MSG) { | |
372 | *format = (uint)INIT_MSG; | |
373 | crq->valid = INVALIDATE_CMD_RESP_EL; | |
374 | dma_rmb(); | |
375 | ||
376 | /* | |
377 | * the caller has ensured no initialize message was | |
378 | * sent after the queue was | |
379 | * created so there should be no other message on the queue. | |
380 | */ | |
381 | crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask, | |
382 | &vscsi->cmd_q.index, | |
383 | vscsi->cmd_q.base_addr); | |
384 | if (crq) { | |
385 | *format = (uint)(crq->format); | |
79fac9c9 | 386 | rc = ERROR; |
88a678bb BL |
387 | crq->valid = INVALIDATE_CMD_RESP_EL; |
388 | dma_rmb(); | |
389 | } | |
390 | } else { | |
391 | *format = (uint)(crq->format); | |
79fac9c9 | 392 | rc = ERROR; |
88a678bb BL |
393 | crq->valid = INVALIDATE_CMD_RESP_EL; |
394 | dma_rmb(); | |
395 | } | |
396 | ||
397 | return rc; | |
398 | } | |
399 | ||
88a678bb BL |
400 | /** |
401 | * ibmvscsis_disconnect() - Helper function to disconnect | |
402 | * @work: Pointer to work_struct, gives access to our adapter structure | |
403 | * | |
404 | * An error has occurred or the driver received a Transport event, | |
405 | * and the driver is requesting that the command queue be de-registered | |
406 | * in a safe manner. If there is no outstanding I/O then we can stop the | |
407 | * queue. If we are restarting the queue it will be reflected in the | |
408 | * the state of the adapter. | |
409 | * | |
410 | * EXECUTION ENVIRONMENT: | |
411 | * Process environment | |
412 | */ | |
413 | static void ibmvscsis_disconnect(struct work_struct *work) | |
414 | { | |
415 | struct scsi_info *vscsi = container_of(work, struct scsi_info, | |
416 | proc_work); | |
417 | u16 new_state; | |
418 | bool wait_idle = false; | |
88a678bb BL |
419 | |
420 | spin_lock_bh(&vscsi->intr_lock); | |
421 | new_state = vscsi->new_state; | |
422 | vscsi->new_state = 0; | |
423 | ||
424 | pr_debug("disconnect: flags 0x%x, state 0x%hx\n", vscsi->flags, | |
425 | vscsi->state); | |
426 | ||
427 | /* | |
428 | * check which state we are in and see if we | |
429 | * should transitition to the new state | |
430 | */ | |
431 | switch (vscsi->state) { | |
79fac9c9 | 432 | /* Should never be called while in this state. */ |
88a678bb BL |
433 | case NO_QUEUE: |
434 | /* | |
435 | * Can never transition from this state; | |
436 | * igonore errors and logout. | |
437 | */ | |
438 | case UNCONFIGURING: | |
439 | break; | |
440 | ||
441 | /* can transition from this state to UNCONFIGURING */ | |
442 | case ERR_DISCONNECT: | |
443 | if (new_state == UNCONFIGURING) | |
444 | vscsi->state = new_state; | |
445 | break; | |
446 | ||
447 | /* | |
448 | * Can transition from this state to to unconfiguring | |
449 | * or err disconnect. | |
450 | */ | |
451 | case ERR_DISCONNECT_RECONNECT: | |
452 | switch (new_state) { | |
453 | case UNCONFIGURING: | |
454 | case ERR_DISCONNECT: | |
455 | vscsi->state = new_state; | |
456 | break; | |
457 | ||
458 | case WAIT_IDLE: | |
459 | break; | |
460 | default: | |
461 | break; | |
462 | } | |
463 | break; | |
464 | ||
465 | /* can transition from this state to UNCONFIGURING */ | |
466 | case ERR_DISCONNECTED: | |
467 | if (new_state == UNCONFIGURING) | |
468 | vscsi->state = new_state; | |
469 | break; | |
470 | ||
88a678bb | 471 | case WAIT_ENABLED: |
88a678bb | 472 | switch (new_state) { |
8bf11557 MC |
473 | case UNCONFIGURING: |
474 | vscsi->state = new_state; | |
475 | vscsi->flags |= RESPONSE_Q_DOWN; | |
476 | vscsi->flags &= ~(SCHEDULE_DISCONNECT | | |
477 | DISCONNECT_SCHEDULED); | |
478 | dma_rmb(); | |
479 | if (vscsi->flags & CFG_SLEEPING) { | |
480 | vscsi->flags &= ~CFG_SLEEPING; | |
481 | complete(&vscsi->unconfig); | |
482 | } | |
483 | break; | |
484 | ||
c9b3379f | 485 | /* should never happen */ |
88a678bb | 486 | case ERR_DISCONNECT: |
88a678bb | 487 | case ERR_DISCONNECT_RECONNECT: |
88a678bb | 488 | case WAIT_IDLE: |
88a678bb BL |
489 | dev_err(&vscsi->dev, "disconnect: invalid state %d for WAIT_IDLE\n", |
490 | vscsi->state); | |
491 | break; | |
492 | } | |
493 | break; | |
494 | ||
495 | case WAIT_IDLE: | |
496 | switch (new_state) { | |
8bf11557 MC |
497 | case UNCONFIGURING: |
498 | vscsi->flags |= RESPONSE_Q_DOWN; | |
499 | vscsi->state = new_state; | |
500 | vscsi->flags &= ~(SCHEDULE_DISCONNECT | | |
501 | DISCONNECT_SCHEDULED); | |
502 | ibmvscsis_free_command_q(vscsi); | |
503 | break; | |
88a678bb BL |
504 | case ERR_DISCONNECT: |
505 | case ERR_DISCONNECT_RECONNECT: | |
506 | vscsi->state = new_state; | |
507 | break; | |
508 | } | |
509 | break; | |
510 | ||
511 | /* | |
512 | * Initiator has not done a successful srp login | |
513 | * or has done a successful srp logout ( adapter was not | |
514 | * busy). In the first case there can be responses queued | |
515 | * waiting for space on the initiators response queue (MAD) | |
516 | * The second case the adapter is idle. Assume the worse case, | |
517 | * i.e. the second case. | |
518 | */ | |
519 | case WAIT_CONNECTION: | |
520 | case CONNECTED: | |
521 | case SRP_PROCESSING: | |
522 | wait_idle = true; | |
523 | vscsi->state = new_state; | |
524 | break; | |
525 | ||
526 | /* can transition from this state to UNCONFIGURING */ | |
527 | case UNDEFINED: | |
528 | if (new_state == UNCONFIGURING) | |
529 | vscsi->state = new_state; | |
530 | break; | |
531 | default: | |
532 | break; | |
533 | } | |
534 | ||
535 | if (wait_idle) { | |
536 | pr_debug("disconnect start wait, active %d, sched %d\n", | |
537 | (int)list_empty(&vscsi->active_q), | |
538 | (int)list_empty(&vscsi->schedule_q)); | |
539 | if (!list_empty(&vscsi->active_q) || | |
540 | !list_empty(&vscsi->schedule_q)) { | |
541 | vscsi->flags |= WAIT_FOR_IDLE; | |
542 | pr_debug("disconnect flags 0x%x\n", vscsi->flags); | |
543 | /* | |
544 | * This routine is can not be called with the interrupt | |
545 | * lock held. | |
546 | */ | |
547 | spin_unlock_bh(&vscsi->intr_lock); | |
548 | wait_for_completion(&vscsi->wait_idle); | |
549 | spin_lock_bh(&vscsi->intr_lock); | |
550 | } | |
551 | pr_debug("disconnect stop wait\n"); | |
552 | ||
553 | ibmvscsis_adapter_idle(vscsi); | |
554 | } | |
555 | ||
556 | spin_unlock_bh(&vscsi->intr_lock); | |
557 | } | |
558 | ||
559 | /** | |
560 | * ibmvscsis_post_disconnect() - Schedule the disconnect | |
561 | * @vscsi: Pointer to our adapter structure | |
562 | * @new_state: State to move to after disconnecting | |
563 | * @flag_bits: Flags to turn on in adapter structure | |
564 | * | |
565 | * If it's already been scheduled, then see if we need to "upgrade" | |
566 | * the new state (if the one passed in is more "severe" than the | |
567 | * previous one). | |
568 | * | |
79fac9c9 MC |
569 | * PRECONDITION: |
570 | * interrupt lock is held | |
571 | */ | |
572 | static void ibmvscsis_post_disconnect(struct scsi_info *vscsi, uint new_state, | |
573 | uint flag_bits) | |
574 | { | |
575 | uint state; | |
576 | ||
577 | /* check the validity of the new state */ | |
578 | switch (new_state) { | |
579 | case UNCONFIGURING: | |
580 | case ERR_DISCONNECT: | |
581 | case ERR_DISCONNECT_RECONNECT: | |
582 | case WAIT_IDLE: | |
583 | break; | |
584 | ||
585 | default: | |
586 | dev_err(&vscsi->dev, "post_disconnect: Invalid new state %d\n", | |
587 | new_state); | |
588 | return; | |
589 | } | |
590 | ||
591 | vscsi->flags |= flag_bits; | |
592 | ||
593 | pr_debug("post_disconnect: new_state 0x%x, flag_bits 0x%x, vscsi->flags 0x%x, state %hx\n", | |
594 | new_state, flag_bits, vscsi->flags, vscsi->state); | |
595 | ||
596 | if (!(vscsi->flags & (DISCONNECT_SCHEDULED | SCHEDULE_DISCONNECT))) { | |
597 | vscsi->flags |= SCHEDULE_DISCONNECT; | |
598 | vscsi->new_state = new_state; | |
599 | ||
600 | INIT_WORK(&vscsi->proc_work, ibmvscsis_disconnect); | |
601 | (void)queue_work(vscsi->work_q, &vscsi->proc_work); | |
602 | } else { | |
603 | if (vscsi->new_state) | |
604 | state = vscsi->new_state; | |
605 | else | |
606 | state = vscsi->state; | |
607 | ||
608 | switch (state) { | |
609 | case NO_QUEUE: | |
610 | case UNCONFIGURING: | |
611 | break; | |
612 | ||
613 | case ERR_DISCONNECTED: | |
614 | case ERR_DISCONNECT: | |
615 | case UNDEFINED: | |
616 | if (new_state == UNCONFIGURING) | |
617 | vscsi->new_state = new_state; | |
618 | break; | |
619 | ||
620 | case ERR_DISCONNECT_RECONNECT: | |
621 | switch (new_state) { | |
622 | case UNCONFIGURING: | |
623 | case ERR_DISCONNECT: | |
624 | vscsi->new_state = new_state; | |
625 | break; | |
626 | default: | |
627 | break; | |
628 | } | |
629 | break; | |
630 | ||
631 | case WAIT_ENABLED: | |
79fac9c9 MC |
632 | case WAIT_IDLE: |
633 | case WAIT_CONNECTION: | |
634 | case CONNECTED: | |
635 | case SRP_PROCESSING: | |
636 | vscsi->new_state = new_state; | |
637 | break; | |
638 | ||
639 | default: | |
640 | break; | |
641 | } | |
642 | } | |
643 | ||
644 | pr_debug("Leaving post_disconnect: flags 0x%x, new_state 0x%x\n", | |
645 | vscsi->flags, vscsi->new_state); | |
646 | } | |
647 | ||
648 | /** | |
649 | * ibmvscsis_handle_init_compl_msg() - Respond to an Init Complete Message | |
650 | * @vscsi: Pointer to our adapter structure | |
651 | * | |
652 | * Must be called with interrupt lock held. | |
653 | */ | |
654 | static long ibmvscsis_handle_init_compl_msg(struct scsi_info *vscsi) | |
655 | { | |
656 | long rc = ADAPT_SUCCESS; | |
657 | ||
658 | switch (vscsi->state) { | |
659 | case NO_QUEUE: | |
660 | case ERR_DISCONNECT: | |
661 | case ERR_DISCONNECT_RECONNECT: | |
662 | case ERR_DISCONNECTED: | |
663 | case UNCONFIGURING: | |
664 | case UNDEFINED: | |
665 | rc = ERROR; | |
666 | break; | |
667 | ||
668 | case WAIT_CONNECTION: | |
669 | vscsi->state = CONNECTED; | |
670 | break; | |
671 | ||
672 | case WAIT_IDLE: | |
673 | case SRP_PROCESSING: | |
674 | case CONNECTED: | |
675 | case WAIT_ENABLED: | |
79fac9c9 MC |
676 | default: |
677 | rc = ERROR; | |
678 | dev_err(&vscsi->dev, "init_msg: invalid state %d to get init compl msg\n", | |
679 | vscsi->state); | |
680 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
681 | break; | |
682 | } | |
683 | ||
684 | return rc; | |
685 | } | |
686 | ||
687 | /** | |
688 | * ibmvscsis_handle_init_msg() - Respond to an Init Message | |
689 | * @vscsi: Pointer to our adapter structure | |
690 | * | |
691 | * Must be called with interrupt lock held. | |
692 | */ | |
693 | static long ibmvscsis_handle_init_msg(struct scsi_info *vscsi) | |
694 | { | |
695 | long rc = ADAPT_SUCCESS; | |
696 | ||
697 | switch (vscsi->state) { | |
79fac9c9 MC |
698 | case WAIT_CONNECTION: |
699 | rc = ibmvscsis_send_init_message(vscsi, INIT_COMPLETE_MSG); | |
700 | switch (rc) { | |
701 | case H_SUCCESS: | |
702 | vscsi->state = CONNECTED; | |
703 | break; | |
704 | ||
705 | case H_PARAMETER: | |
706 | dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n", | |
707 | rc); | |
708 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); | |
709 | break; | |
710 | ||
711 | case H_DROPPED: | |
712 | dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n", | |
713 | rc); | |
714 | rc = ERROR; | |
715 | ibmvscsis_post_disconnect(vscsi, | |
716 | ERR_DISCONNECT_RECONNECT, 0); | |
717 | break; | |
718 | ||
719 | case H_CLOSED: | |
720 | pr_warn("init_msg: failed to send, rc %ld\n", rc); | |
721 | rc = 0; | |
722 | break; | |
723 | } | |
724 | break; | |
725 | ||
726 | case UNDEFINED: | |
727 | rc = ERROR; | |
728 | break; | |
729 | ||
730 | case UNCONFIGURING: | |
731 | break; | |
732 | ||
c9b3379f | 733 | case WAIT_ENABLED: |
79fac9c9 MC |
734 | case CONNECTED: |
735 | case SRP_PROCESSING: | |
736 | case WAIT_IDLE: | |
737 | case NO_QUEUE: | |
738 | case ERR_DISCONNECT: | |
739 | case ERR_DISCONNECT_RECONNECT: | |
740 | case ERR_DISCONNECTED: | |
741 | default: | |
742 | rc = ERROR; | |
743 | dev_err(&vscsi->dev, "init_msg: invalid state %d to get init msg\n", | |
744 | vscsi->state); | |
745 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
746 | break; | |
747 | } | |
748 | ||
749 | return rc; | |
750 | } | |
751 | ||
752 | /** | |
753 | * ibmvscsis_init_msg() - Respond to an init message | |
754 | * @vscsi: Pointer to our adapter structure | |
755 | * @crq: Pointer to CRQ element containing the Init Message | |
756 | * | |
757 | * EXECUTION ENVIRONMENT: | |
758 | * Interrupt, interrupt lock held | |
759 | */ | |
760 | static long ibmvscsis_init_msg(struct scsi_info *vscsi, struct viosrp_crq *crq) | |
761 | { | |
762 | long rc = ADAPT_SUCCESS; | |
763 | ||
764 | pr_debug("init_msg: state 0x%hx\n", vscsi->state); | |
765 | ||
766 | rc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO, | |
767 | (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0, | |
768 | 0); | |
769 | if (rc == H_SUCCESS) { | |
770 | vscsi->client_data.partition_number = | |
771 | be64_to_cpu(*(u64 *)vscsi->map_buf); | |
772 | pr_debug("init_msg, part num %d\n", | |
773 | vscsi->client_data.partition_number); | |
774 | } else { | |
775 | pr_debug("init_msg h_vioctl rc %ld\n", rc); | |
776 | rc = ADAPT_SUCCESS; | |
777 | } | |
778 | ||
779 | if (crq->format == INIT_MSG) { | |
780 | rc = ibmvscsis_handle_init_msg(vscsi); | |
781 | } else if (crq->format == INIT_COMPLETE_MSG) { | |
782 | rc = ibmvscsis_handle_init_compl_msg(vscsi); | |
783 | } else { | |
784 | rc = ERROR; | |
785 | dev_err(&vscsi->dev, "init_msg: invalid format %d\n", | |
786 | (uint)crq->format); | |
787 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
788 | } | |
789 | ||
790 | return rc; | |
791 | } | |
792 | ||
793 | /** | |
794 | * ibmvscsis_establish_new_q() - Establish new CRQ queue | |
795 | * @vscsi: Pointer to our adapter structure | |
79fac9c9 MC |
796 | * |
797 | * Must be called with interrupt lock held. | |
798 | */ | |
c9b3379f | 799 | static long ibmvscsis_establish_new_q(struct scsi_info *vscsi) |
79fac9c9 MC |
800 | { |
801 | long rc = ADAPT_SUCCESS; | |
802 | uint format; | |
803 | ||
804 | vscsi->flags &= PRESERVE_FLAG_FIELDS; | |
805 | vscsi->rsp_q_timer.timer_pops = 0; | |
806 | vscsi->debit = 0; | |
807 | vscsi->credit = 0; | |
808 | ||
809 | rc = vio_enable_interrupts(vscsi->dma_dev); | |
810 | if (rc) { | |
c9b3379f | 811 | pr_warn("establish_new_q: failed to enable interrupts, rc %ld\n", |
79fac9c9 MC |
812 | rc); |
813 | return rc; | |
814 | } | |
815 | ||
816 | rc = ibmvscsis_check_init_msg(vscsi, &format); | |
817 | if (rc) { | |
c9b3379f | 818 | dev_err(&vscsi->dev, "establish_new_q: check_init_msg failed, rc %ld\n", |
79fac9c9 MC |
819 | rc); |
820 | return rc; | |
821 | } | |
822 | ||
c9b3379f | 823 | if (format == UNUSED_FORMAT) { |
79fac9c9 MC |
824 | rc = ibmvscsis_send_init_message(vscsi, INIT_MSG); |
825 | switch (rc) { | |
826 | case H_SUCCESS: | |
827 | case H_DROPPED: | |
828 | case H_CLOSED: | |
829 | rc = ADAPT_SUCCESS; | |
830 | break; | |
831 | ||
832 | case H_PARAMETER: | |
833 | case H_HARDWARE: | |
834 | break; | |
835 | ||
836 | default: | |
837 | vscsi->state = UNDEFINED; | |
838 | rc = H_HARDWARE; | |
839 | break; | |
840 | } | |
c9b3379f MC |
841 | } else if (format == INIT_MSG) { |
842 | rc = ibmvscsis_handle_init_msg(vscsi); | |
79fac9c9 MC |
843 | } |
844 | ||
845 | return rc; | |
846 | } | |
847 | ||
848 | /** | |
849 | * ibmvscsis_reset_queue() - Reset CRQ Queue | |
850 | * @vscsi: Pointer to our adapter structure | |
79fac9c9 MC |
851 | * |
852 | * This function calls h_free_q and then calls h_reg_q and does all | |
853 | * of the bookkeeping to get us back to where we can communicate. | |
854 | * | |
855 | * Actually, we don't always call h_free_crq. A problem was discovered | |
856 | * where one partition would close and reopen his queue, which would | |
857 | * cause his partner to get a transport event, which would cause him to | |
858 | * close and reopen his queue, which would cause the original partition | |
859 | * to get a transport event, etc., etc. To prevent this, we don't | |
860 | * actually close our queue if the client initiated the reset, (i.e. | |
861 | * either we got a transport event or we have detected that the client's | |
862 | * queue is gone) | |
863 | * | |
864 | * EXECUTION ENVIRONMENT: | |
865 | * Process environment, called with interrupt lock held | |
866 | */ | |
c9b3379f | 867 | static void ibmvscsis_reset_queue(struct scsi_info *vscsi) |
79fac9c9 MC |
868 | { |
869 | int bytes; | |
870 | long rc = ADAPT_SUCCESS; | |
871 | ||
872 | pr_debug("reset_queue: flags 0x%x\n", vscsi->flags); | |
873 | ||
874 | /* don't reset, the client did it for us */ | |
875 | if (vscsi->flags & (CLIENT_FAILED | TRANS_EVENT)) { | |
876 | vscsi->flags &= PRESERVE_FLAG_FIELDS; | |
877 | vscsi->rsp_q_timer.timer_pops = 0; | |
878 | vscsi->debit = 0; | |
879 | vscsi->credit = 0; | |
c9b3379f | 880 | vscsi->state = WAIT_CONNECTION; |
79fac9c9 MC |
881 | vio_enable_interrupts(vscsi->dma_dev); |
882 | } else { | |
883 | rc = ibmvscsis_free_command_q(vscsi); | |
884 | if (rc == ADAPT_SUCCESS) { | |
c9b3379f | 885 | vscsi->state = WAIT_CONNECTION; |
79fac9c9 MC |
886 | |
887 | bytes = vscsi->cmd_q.size * PAGE_SIZE; | |
888 | rc = h_reg_crq(vscsi->dds.unit_id, | |
889 | vscsi->cmd_q.crq_token, bytes); | |
890 | if (rc == H_CLOSED || rc == H_SUCCESS) { | |
c9b3379f | 891 | rc = ibmvscsis_establish_new_q(vscsi); |
79fac9c9 MC |
892 | } |
893 | ||
894 | if (rc != ADAPT_SUCCESS) { | |
895 | pr_debug("reset_queue: reg_crq rc %ld\n", rc); | |
896 | ||
897 | vscsi->state = ERR_DISCONNECTED; | |
898 | vscsi->flags |= RESPONSE_Q_DOWN; | |
899 | ibmvscsis_free_command_q(vscsi); | |
900 | } | |
901 | } else { | |
902 | vscsi->state = ERR_DISCONNECTED; | |
903 | vscsi->flags |= RESPONSE_Q_DOWN; | |
904 | } | |
905 | } | |
906 | } | |
907 | ||
908 | /** | |
909 | * ibmvscsis_free_cmd_resources() - Free command resources | |
910 | * @vscsi: Pointer to our adapter structure | |
911 | * @cmd: Command which is not longer in use | |
912 | * | |
913 | * Must be called with interrupt lock held. | |
88a678bb | 914 | */ |
79fac9c9 MC |
915 | static void ibmvscsis_free_cmd_resources(struct scsi_info *vscsi, |
916 | struct ibmvscsis_cmd *cmd) | |
88a678bb | 917 | { |
79fac9c9 | 918 | struct iu_entry *iue = cmd->iue; |
88a678bb | 919 | |
79fac9c9 MC |
920 | switch (cmd->type) { |
921 | case TASK_MANAGEMENT: | |
922 | case SCSI_CDB: | |
923 | /* | |
924 | * When the queue goes down this value is cleared, so it | |
925 | * cannot be cleared in this general purpose function. | |
926 | */ | |
927 | if (vscsi->debit) | |
928 | vscsi->debit -= 1; | |
929 | break; | |
930 | case ADAPTER_MAD: | |
931 | vscsi->flags &= ~PROCESSING_MAD; | |
932 | break; | |
933 | case UNSET_TYPE: | |
88a678bb | 934 | break; |
88a678bb | 935 | default: |
79fac9c9 MC |
936 | dev_err(&vscsi->dev, "free_cmd_resources unknown type %d\n", |
937 | cmd->type); | |
938 | break; | |
88a678bb BL |
939 | } |
940 | ||
79fac9c9 MC |
941 | cmd->iue = NULL; |
942 | list_add_tail(&cmd->list, &vscsi->free_cmd); | |
943 | srp_iu_put(iue); | |
88a678bb | 944 | |
79fac9c9 MC |
945 | if (list_empty(&vscsi->active_q) && list_empty(&vscsi->schedule_q) && |
946 | list_empty(&vscsi->waiting_rsp) && (vscsi->flags & WAIT_FOR_IDLE)) { | |
947 | vscsi->flags &= ~WAIT_FOR_IDLE; | |
948 | complete(&vscsi->wait_idle); | |
88a678bb | 949 | } |
88a678bb BL |
950 | } |
951 | ||
952 | /** | |
953 | * ibmvscsis_trans_event() - Handle a Transport Event | |
954 | * @vscsi: Pointer to our adapter structure | |
955 | * @crq: Pointer to CRQ entry containing the Transport Event | |
956 | * | |
957 | * Do the logic to close the I_T nexus. This function may not | |
958 | * behave to specification. | |
959 | * | |
960 | * EXECUTION ENVIRONMENT: | |
961 | * Interrupt, interrupt lock held | |
962 | */ | |
963 | static long ibmvscsis_trans_event(struct scsi_info *vscsi, | |
964 | struct viosrp_crq *crq) | |
965 | { | |
966 | long rc = ADAPT_SUCCESS; | |
967 | ||
968 | pr_debug("trans_event: format %d, flags 0x%x, state 0x%hx\n", | |
969 | (int)crq->format, vscsi->flags, vscsi->state); | |
970 | ||
971 | switch (crq->format) { | |
972 | case MIGRATED: | |
973 | case PARTNER_FAILED: | |
974 | case PARTNER_DEREGISTER: | |
975 | ibmvscsis_delete_client_info(vscsi, true); | |
976 | break; | |
977 | ||
978 | default: | |
979 | rc = ERROR; | |
980 | dev_err(&vscsi->dev, "trans_event: invalid format %d\n", | |
981 | (uint)crq->format); | |
982 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, | |
983 | RESPONSE_Q_DOWN); | |
984 | break; | |
985 | } | |
986 | ||
987 | if (rc == ADAPT_SUCCESS) { | |
988 | switch (vscsi->state) { | |
989 | case NO_QUEUE: | |
990 | case ERR_DISCONNECTED: | |
991 | case UNDEFINED: | |
992 | break; | |
993 | ||
994 | case UNCONFIGURING: | |
995 | vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT); | |
996 | break; | |
997 | ||
998 | case WAIT_ENABLED: | |
999 | break; | |
1000 | ||
1001 | case WAIT_CONNECTION: | |
1002 | break; | |
1003 | ||
1004 | case CONNECTED: | |
1005 | ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, | |
1006 | (RESPONSE_Q_DOWN | | |
1007 | TRANS_EVENT)); | |
1008 | break; | |
1009 | ||
88a678bb BL |
1010 | case SRP_PROCESSING: |
1011 | if ((vscsi->debit > 0) || | |
1012 | !list_empty(&vscsi->schedule_q) || | |
1013 | !list_empty(&vscsi->waiting_rsp) || | |
1014 | !list_empty(&vscsi->active_q)) { | |
1015 | pr_debug("debit %d, sched %d, wait %d, active %d\n", | |
1016 | vscsi->debit, | |
1017 | (int)list_empty(&vscsi->schedule_q), | |
1018 | (int)list_empty(&vscsi->waiting_rsp), | |
1019 | (int)list_empty(&vscsi->active_q)); | |
1020 | pr_warn("connection lost with outstanding work\n"); | |
1021 | } else { | |
1022 | pr_debug("trans_event: SRP Processing, but no outstanding work\n"); | |
1023 | } | |
1024 | ||
1025 | ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, | |
1026 | (RESPONSE_Q_DOWN | | |
1027 | TRANS_EVENT)); | |
1028 | break; | |
1029 | ||
1030 | case ERR_DISCONNECT: | |
1031 | case ERR_DISCONNECT_RECONNECT: | |
1032 | case WAIT_IDLE: | |
1033 | vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT); | |
1034 | break; | |
1035 | } | |
1036 | } | |
1037 | ||
79fac9c9 | 1038 | rc = vscsi->flags & SCHEDULE_DISCONNECT; |
88a678bb BL |
1039 | |
1040 | pr_debug("Leaving trans_event: flags 0x%x, state 0x%hx, rc %ld\n", | |
1041 | vscsi->flags, vscsi->state, rc); | |
1042 | ||
1043 | return rc; | |
1044 | } | |
1045 | ||
1046 | /** | |
1047 | * ibmvscsis_poll_cmd_q() - Poll Command Queue | |
1048 | * @vscsi: Pointer to our adapter structure | |
1049 | * | |
1050 | * Called to handle command elements that may have arrived while | |
1051 | * interrupts were disabled. | |
1052 | * | |
1053 | * EXECUTION ENVIRONMENT: | |
1054 | * intr_lock must be held | |
1055 | */ | |
1056 | static void ibmvscsis_poll_cmd_q(struct scsi_info *vscsi) | |
1057 | { | |
1058 | struct viosrp_crq *crq; | |
1059 | long rc; | |
1060 | bool ack = true; | |
1061 | volatile u8 valid; | |
1062 | ||
1063 | pr_debug("poll_cmd_q: flags 0x%x, state 0x%hx, q index %ud\n", | |
1064 | vscsi->flags, vscsi->state, vscsi->cmd_q.index); | |
1065 | ||
1066 | rc = vscsi->flags & SCHEDULE_DISCONNECT; | |
1067 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
1068 | valid = crq->valid; | |
1069 | dma_rmb(); | |
1070 | ||
1071 | while (valid) { | |
1072 | poll_work: | |
1073 | vscsi->cmd_q.index = | |
1074 | (vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask; | |
1075 | ||
1076 | if (!rc) { | |
1077 | rc = ibmvscsis_parse_command(vscsi, crq); | |
1078 | } else { | |
1079 | if ((uint)crq->valid == VALID_TRANS_EVENT) { | |
1080 | /* | |
1081 | * must service the transport layer events even | |
1082 | * in an error state, dont break out until all | |
1083 | * the consecutive transport events have been | |
1084 | * processed | |
1085 | */ | |
1086 | rc = ibmvscsis_trans_event(vscsi, crq); | |
1087 | } else if (vscsi->flags & TRANS_EVENT) { | |
1088 | /* | |
1089 | * if a tranport event has occurred leave | |
1090 | * everything but transport events on the queue | |
1091 | */ | |
1092 | pr_debug("poll_cmd_q, ignoring\n"); | |
1093 | ||
1094 | /* | |
1095 | * need to decrement the queue index so we can | |
1096 | * look at the elment again | |
1097 | */ | |
1098 | if (vscsi->cmd_q.index) | |
1099 | vscsi->cmd_q.index -= 1; | |
1100 | else | |
1101 | /* | |
1102 | * index is at 0 it just wrapped. | |
1103 | * have it index last element in q | |
1104 | */ | |
1105 | vscsi->cmd_q.index = vscsi->cmd_q.mask; | |
1106 | break; | |
1107 | } | |
1108 | } | |
1109 | ||
1110 | crq->valid = INVALIDATE_CMD_RESP_EL; | |
1111 | ||
1112 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
1113 | valid = crq->valid; | |
1114 | dma_rmb(); | |
1115 | } | |
1116 | ||
1117 | if (!rc) { | |
1118 | if (ack) { | |
1119 | vio_enable_interrupts(vscsi->dma_dev); | |
1120 | ack = false; | |
1121 | pr_debug("poll_cmd_q, reenabling interrupts\n"); | |
1122 | } | |
1123 | valid = crq->valid; | |
1124 | dma_rmb(); | |
1125 | if (valid) | |
1126 | goto poll_work; | |
1127 | } | |
1128 | ||
1129 | pr_debug("Leaving poll_cmd_q: rc %ld\n", rc); | |
1130 | } | |
1131 | ||
1132 | /** | |
1133 | * ibmvscsis_free_cmd_qs() - Free elements in queue | |
1134 | * @vscsi: Pointer to our adapter structure | |
1135 | * | |
1136 | * Free all of the elements on all queues that are waiting for | |
1137 | * whatever reason. | |
1138 | * | |
1139 | * PRECONDITION: | |
1140 | * Called with interrupt lock held | |
1141 | */ | |
1142 | static void ibmvscsis_free_cmd_qs(struct scsi_info *vscsi) | |
1143 | { | |
1144 | struct ibmvscsis_cmd *cmd, *nxt; | |
1145 | ||
1146 | pr_debug("free_cmd_qs: waiting_rsp empty %d, timer starter %d\n", | |
1147 | (int)list_empty(&vscsi->waiting_rsp), | |
1148 | vscsi->rsp_q_timer.started); | |
1149 | ||
1150 | list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp, list) { | |
1151 | list_del(&cmd->list); | |
1152 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
1153 | } | |
1154 | } | |
1155 | ||
1156 | /** | |
1157 | * ibmvscsis_get_free_cmd() - Get free command from list | |
1158 | * @vscsi: Pointer to our adapter structure | |
1159 | * | |
1160 | * Must be called with interrupt lock held. | |
1161 | */ | |
1162 | static struct ibmvscsis_cmd *ibmvscsis_get_free_cmd(struct scsi_info *vscsi) | |
1163 | { | |
1164 | struct ibmvscsis_cmd *cmd = NULL; | |
1165 | struct iu_entry *iue; | |
1166 | ||
1167 | iue = srp_iu_get(&vscsi->target); | |
1168 | if (iue) { | |
1169 | cmd = list_first_entry_or_null(&vscsi->free_cmd, | |
1170 | struct ibmvscsis_cmd, list); | |
1171 | if (cmd) { | |
1172 | list_del(&cmd->list); | |
1173 | cmd->iue = iue; | |
1174 | cmd->type = UNSET_TYPE; | |
1175 | memset(&cmd->se_cmd, 0, sizeof(cmd->se_cmd)); | |
1176 | } else { | |
1177 | srp_iu_put(iue); | |
1178 | } | |
1179 | } | |
1180 | ||
1181 | return cmd; | |
1182 | } | |
1183 | ||
1184 | /** | |
1185 | * ibmvscsis_adapter_idle() - Helper function to handle idle adapter | |
1186 | * @vscsi: Pointer to our adapter structure | |
1187 | * | |
1188 | * This function is called when the adapter is idle when the driver | |
1189 | * is attempting to clear an error condition. | |
1190 | * The adapter is considered busy if any of its cmd queues | |
1191 | * are non-empty. This function can be invoked | |
1192 | * from the off level disconnect function. | |
1193 | * | |
1194 | * EXECUTION ENVIRONMENT: | |
1195 | * Process environment called with interrupt lock held | |
1196 | */ | |
1197 | static void ibmvscsis_adapter_idle(struct scsi_info *vscsi) | |
1198 | { | |
1199 | int free_qs = false; | |
1200 | ||
1201 | pr_debug("adapter_idle: flags 0x%x, state 0x%hx\n", vscsi->flags, | |
1202 | vscsi->state); | |
1203 | ||
1204 | /* Only need to free qs if we're disconnecting from client */ | |
1205 | if (vscsi->state != WAIT_CONNECTION || vscsi->flags & TRANS_EVENT) | |
1206 | free_qs = true; | |
1207 | ||
1208 | switch (vscsi->state) { | |
8bf11557 MC |
1209 | case UNCONFIGURING: |
1210 | ibmvscsis_free_command_q(vscsi); | |
1211 | dma_rmb(); | |
1212 | isync(); | |
1213 | if (vscsi->flags & CFG_SLEEPING) { | |
1214 | vscsi->flags &= ~CFG_SLEEPING; | |
1215 | complete(&vscsi->unconfig); | |
1216 | } | |
1217 | break; | |
88a678bb | 1218 | case ERR_DISCONNECT_RECONNECT: |
c9b3379f | 1219 | ibmvscsis_reset_queue(vscsi); |
88a678bb BL |
1220 | pr_debug("adapter_idle, disc_rec: flags 0x%x\n", vscsi->flags); |
1221 | break; | |
1222 | ||
1223 | case ERR_DISCONNECT: | |
1224 | ibmvscsis_free_command_q(vscsi); | |
c9b3379f | 1225 | vscsi->flags &= ~(SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED); |
88a678bb | 1226 | vscsi->flags |= RESPONSE_Q_DOWN; |
c9b3379f MC |
1227 | if (vscsi->tport.enabled) |
1228 | vscsi->state = ERR_DISCONNECTED; | |
1229 | else | |
1230 | vscsi->state = WAIT_ENABLED; | |
88a678bb BL |
1231 | pr_debug("adapter_idle, disc: flags 0x%x, state 0x%hx\n", |
1232 | vscsi->flags, vscsi->state); | |
1233 | break; | |
1234 | ||
1235 | case WAIT_IDLE: | |
1236 | vscsi->rsp_q_timer.timer_pops = 0; | |
1237 | vscsi->debit = 0; | |
1238 | vscsi->credit = 0; | |
1239 | if (vscsi->flags & TRANS_EVENT) { | |
1240 | vscsi->state = WAIT_CONNECTION; | |
1241 | vscsi->flags &= PRESERVE_FLAG_FIELDS; | |
1242 | } else { | |
1243 | vscsi->state = CONNECTED; | |
1244 | vscsi->flags &= ~DISCONNECT_SCHEDULED; | |
1245 | } | |
1246 | ||
1247 | pr_debug("adapter_idle, wait: flags 0x%x, state 0x%hx\n", | |
1248 | vscsi->flags, vscsi->state); | |
1249 | ibmvscsis_poll_cmd_q(vscsi); | |
1250 | break; | |
1251 | ||
1252 | case ERR_DISCONNECTED: | |
1253 | vscsi->flags &= ~DISCONNECT_SCHEDULED; | |
1254 | pr_debug("adapter_idle, disconnected: flags 0x%x, state 0x%hx\n", | |
1255 | vscsi->flags, vscsi->state); | |
1256 | break; | |
1257 | ||
1258 | default: | |
1259 | dev_err(&vscsi->dev, "adapter_idle: in invalid state %d\n", | |
1260 | vscsi->state); | |
1261 | break; | |
1262 | } | |
1263 | ||
1264 | if (free_qs) | |
1265 | ibmvscsis_free_cmd_qs(vscsi); | |
1266 | ||
1267 | /* | |
1268 | * There is a timing window where we could lose a disconnect request. | |
1269 | * The known path to this window occurs during the DISCONNECT_RECONNECT | |
1270 | * case above: reset_queue calls free_command_q, which will release the | |
1271 | * interrupt lock. During that time, a new post_disconnect call can be | |
1272 | * made with a "more severe" state (DISCONNECT or UNCONFIGURING). | |
1273 | * Because the DISCONNECT_SCHEDULED flag is already set, post_disconnect | |
1274 | * will only set the new_state. Now free_command_q reacquires the intr | |
1275 | * lock and clears the DISCONNECT_SCHEDULED flag (using PRESERVE_FLAG_ | |
1276 | * FIELDS), and the disconnect is lost. This is particularly bad when | |
1277 | * the new disconnect was for UNCONFIGURING, since the unconfigure hangs | |
1278 | * forever. | |
1279 | * Fix is that free command queue sets acr state and acr flags if there | |
1280 | * is a change under the lock | |
1281 | * note free command queue writes to this state it clears it | |
1282 | * before releasing the lock, different drivers call the free command | |
1283 | * queue different times so dont initialize above | |
1284 | */ | |
1285 | if (vscsi->phyp_acr_state != 0) { | |
1286 | /* | |
1287 | * set any bits in flags that may have been cleared by | |
1288 | * a call to free command queue in switch statement | |
1289 | * or reset queue | |
1290 | */ | |
1291 | vscsi->flags |= vscsi->phyp_acr_flags; | |
1292 | ibmvscsis_post_disconnect(vscsi, vscsi->phyp_acr_state, 0); | |
1293 | vscsi->phyp_acr_state = 0; | |
1294 | vscsi->phyp_acr_flags = 0; | |
1295 | ||
1296 | pr_debug("adapter_idle: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n", | |
1297 | vscsi->flags, vscsi->state, vscsi->phyp_acr_flags, | |
1298 | vscsi->phyp_acr_state); | |
1299 | } | |
1300 | ||
1301 | pr_debug("Leaving adapter_idle: flags 0x%x, state 0x%hx, new_state 0x%x\n", | |
1302 | vscsi->flags, vscsi->state, vscsi->new_state); | |
1303 | } | |
1304 | ||
1305 | /** | |
1306 | * ibmvscsis_copy_crq_packet() - Copy CRQ Packet | |
1307 | * @vscsi: Pointer to our adapter structure | |
1308 | * @cmd: Pointer to command element to use to process the request | |
1309 | * @crq: Pointer to CRQ entry containing the request | |
1310 | * | |
1311 | * Copy the srp information unit from the hosted | |
1312 | * partition using remote dma | |
1313 | * | |
1314 | * EXECUTION ENVIRONMENT: | |
1315 | * Interrupt, interrupt lock held | |
1316 | */ | |
1317 | static long ibmvscsis_copy_crq_packet(struct scsi_info *vscsi, | |
1318 | struct ibmvscsis_cmd *cmd, | |
1319 | struct viosrp_crq *crq) | |
1320 | { | |
1321 | struct iu_entry *iue = cmd->iue; | |
1322 | long rc = 0; | |
1323 | u16 len; | |
1324 | ||
1325 | len = be16_to_cpu(crq->IU_length); | |
1326 | if ((len > SRP_MAX_IU_LEN) || (len == 0)) { | |
1327 | dev_err(&vscsi->dev, "copy_crq: Invalid len %d passed", len); | |
1328 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
1329 | return SRP_VIOLATION; | |
1330 | } | |
1331 | ||
1332 | rc = h_copy_rdma(len, vscsi->dds.window[REMOTE].liobn, | |
1333 | be64_to_cpu(crq->IU_data_ptr), | |
1334 | vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma); | |
1335 | ||
1336 | switch (rc) { | |
1337 | case H_SUCCESS: | |
1338 | cmd->init_time = mftb(); | |
1339 | iue->remote_token = crq->IU_data_ptr; | |
1340 | iue->iu_len = len; | |
1341 | pr_debug("copy_crq: ioba 0x%llx, init_time 0x%llx\n", | |
1342 | be64_to_cpu(crq->IU_data_ptr), cmd->init_time); | |
1343 | break; | |
1344 | case H_PERMISSION: | |
1345 | if (connection_broken(vscsi)) | |
1346 | ibmvscsis_post_disconnect(vscsi, | |
1347 | ERR_DISCONNECT_RECONNECT, | |
1348 | (RESPONSE_Q_DOWN | | |
1349 | CLIENT_FAILED)); | |
1350 | else | |
1351 | ibmvscsis_post_disconnect(vscsi, | |
1352 | ERR_DISCONNECT_RECONNECT, 0); | |
1353 | ||
1354 | dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n", | |
1355 | rc); | |
1356 | break; | |
1357 | case H_DEST_PARM: | |
1358 | case H_SOURCE_PARM: | |
1359 | default: | |
1360 | dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n", | |
1361 | rc); | |
1362 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
1363 | break; | |
1364 | } | |
1365 | ||
1366 | return rc; | |
1367 | } | |
1368 | ||
1369 | /** | |
1370 | * ibmvscsis_adapter_info - Service an Adapter Info MAnagement Data gram | |
1371 | * @vscsi: Pointer to our adapter structure | |
1372 | * @iue: Information Unit containing the Adapter Info MAD request | |
1373 | * | |
1374 | * EXECUTION ENVIRONMENT: | |
79fac9c9 | 1375 | * Interrupt adapter lock is held |
88a678bb BL |
1376 | */ |
1377 | static long ibmvscsis_adapter_info(struct scsi_info *vscsi, | |
1378 | struct iu_entry *iue) | |
1379 | { | |
1380 | struct viosrp_adapter_info *mad = &vio_iu(iue)->mad.adapter_info; | |
1381 | struct mad_adapter_info_data *info; | |
1382 | uint flag_bits = 0; | |
1383 | dma_addr_t token; | |
1384 | long rc; | |
1385 | ||
1386 | mad->common.status = cpu_to_be16(VIOSRP_MAD_SUCCESS); | |
1387 | ||
1388 | if (be16_to_cpu(mad->common.length) > sizeof(*info)) { | |
1389 | mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1390 | return 0; | |
1391 | } | |
1392 | ||
1393 | info = dma_alloc_coherent(&vscsi->dma_dev->dev, sizeof(*info), &token, | |
1394 | GFP_KERNEL); | |
1395 | if (!info) { | |
1396 | dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n", | |
1397 | iue->target); | |
1398 | mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1399 | return 0; | |
1400 | } | |
1401 | ||
1402 | /* Get remote info */ | |
1403 | rc = h_copy_rdma(be16_to_cpu(mad->common.length), | |
1404 | vscsi->dds.window[REMOTE].liobn, | |
1405 | be64_to_cpu(mad->buffer), | |
1406 | vscsi->dds.window[LOCAL].liobn, token); | |
1407 | ||
1408 | if (rc != H_SUCCESS) { | |
1409 | if (rc == H_PERMISSION) { | |
1410 | if (connection_broken(vscsi)) | |
1411 | flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED); | |
1412 | } | |
1413 | pr_warn("adapter_info: h_copy_rdma from client failed, rc %ld\n", | |
1414 | rc); | |
1415 | pr_debug("adapter_info: ioba 0x%llx, flags 0x%x, flag_bits 0x%x\n", | |
1416 | be64_to_cpu(mad->buffer), vscsi->flags, flag_bits); | |
1417 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, | |
1418 | flag_bits); | |
1419 | goto free_dma; | |
1420 | } | |
1421 | ||
1422 | /* | |
1423 | * Copy client info, but ignore partition number, which we | |
1424 | * already got from phyp - unless we failed to get it from | |
1425 | * phyp (e.g. if we're running on a p5 system). | |
1426 | */ | |
1427 | if (vscsi->client_data.partition_number == 0) | |
1428 | vscsi->client_data.partition_number = | |
1429 | be32_to_cpu(info->partition_number); | |
1430 | strncpy(vscsi->client_data.srp_version, info->srp_version, | |
1431 | sizeof(vscsi->client_data.srp_version)); | |
1432 | strncpy(vscsi->client_data.partition_name, info->partition_name, | |
1433 | sizeof(vscsi->client_data.partition_name)); | |
1434 | vscsi->client_data.mad_version = be32_to_cpu(info->mad_version); | |
1435 | vscsi->client_data.os_type = be32_to_cpu(info->os_type); | |
1436 | ||
1437 | /* Copy our info */ | |
1438 | strncpy(info->srp_version, SRP_VERSION, | |
1439 | sizeof(info->srp_version)); | |
1440 | strncpy(info->partition_name, vscsi->dds.partition_name, | |
1441 | sizeof(info->partition_name)); | |
1442 | info->partition_number = cpu_to_be32(vscsi->dds.partition_num); | |
1443 | info->mad_version = cpu_to_be32(MAD_VERSION_1); | |
1444 | info->os_type = cpu_to_be32(LINUX); | |
1445 | memset(&info->port_max_txu[0], 0, sizeof(info->port_max_txu)); | |
1446 | info->port_max_txu[0] = cpu_to_be32(128 * PAGE_SIZE); | |
1447 | ||
1448 | dma_wmb(); | |
1449 | rc = h_copy_rdma(sizeof(*info), vscsi->dds.window[LOCAL].liobn, | |
1450 | token, vscsi->dds.window[REMOTE].liobn, | |
1451 | be64_to_cpu(mad->buffer)); | |
1452 | switch (rc) { | |
1453 | case H_SUCCESS: | |
1454 | break; | |
1455 | ||
1456 | case H_SOURCE_PARM: | |
1457 | case H_DEST_PARM: | |
1458 | case H_PERMISSION: | |
1459 | if (connection_broken(vscsi)) | |
1460 | flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED); | |
1461 | default: | |
1462 | dev_err(&vscsi->dev, "adapter_info: h_copy_rdma to client failed, rc %ld\n", | |
1463 | rc); | |
1464 | ibmvscsis_post_disconnect(vscsi, | |
1465 | ERR_DISCONNECT_RECONNECT, | |
1466 | flag_bits); | |
1467 | break; | |
1468 | } | |
1469 | ||
1470 | free_dma: | |
1471 | dma_free_coherent(&vscsi->dma_dev->dev, sizeof(*info), info, token); | |
1472 | pr_debug("Leaving adapter_info, rc %ld\n", rc); | |
1473 | ||
1474 | return rc; | |
1475 | } | |
1476 | ||
1477 | /** | |
1478 | * ibmvscsis_cap_mad() - Service a Capabilities MAnagement Data gram | |
1479 | * @vscsi: Pointer to our adapter structure | |
1480 | * @iue: Information Unit containing the Capabilities MAD request | |
1481 | * | |
1482 | * NOTE: if you return an error from this routine you must be | |
1483 | * disconnecting or you will cause a hang | |
1484 | * | |
1485 | * EXECUTION ENVIRONMENT: | |
1486 | * Interrupt called with adapter lock held | |
1487 | */ | |
1488 | static int ibmvscsis_cap_mad(struct scsi_info *vscsi, struct iu_entry *iue) | |
1489 | { | |
1490 | struct viosrp_capabilities *mad = &vio_iu(iue)->mad.capabilities; | |
1491 | struct capabilities *cap; | |
1492 | struct mad_capability_common *common; | |
1493 | dma_addr_t token; | |
1494 | u16 olen, len, status, min_len, cap_len; | |
1495 | u32 flag; | |
1496 | uint flag_bits = 0; | |
1497 | long rc = 0; | |
1498 | ||
1499 | olen = be16_to_cpu(mad->common.length); | |
1500 | /* | |
1501 | * struct capabilities hardcodes a couple capabilities after the | |
1502 | * header, but the capabilities can actually be in any order. | |
1503 | */ | |
1504 | min_len = offsetof(struct capabilities, migration); | |
1505 | if ((olen < min_len) || (olen > PAGE_SIZE)) { | |
1506 | pr_warn("cap_mad: invalid len %d\n", olen); | |
1507 | mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1508 | return 0; | |
1509 | } | |
1510 | ||
1511 | cap = dma_alloc_coherent(&vscsi->dma_dev->dev, olen, &token, | |
1512 | GFP_KERNEL); | |
1513 | if (!cap) { | |
1514 | dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n", | |
1515 | iue->target); | |
1516 | mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1517 | return 0; | |
1518 | } | |
1519 | rc = h_copy_rdma(olen, vscsi->dds.window[REMOTE].liobn, | |
1520 | be64_to_cpu(mad->buffer), | |
1521 | vscsi->dds.window[LOCAL].liobn, token); | |
1522 | if (rc == H_SUCCESS) { | |
1523 | strncpy(cap->name, dev_name(&vscsi->dma_dev->dev), | |
1524 | SRP_MAX_LOC_LEN); | |
1525 | ||
1526 | len = olen - min_len; | |
1527 | status = VIOSRP_MAD_SUCCESS; | |
1528 | common = (struct mad_capability_common *)&cap->migration; | |
1529 | ||
1530 | while ((len > 0) && (status == VIOSRP_MAD_SUCCESS) && !rc) { | |
1531 | pr_debug("cap_mad: len left %hd, cap type %d, cap len %hd\n", | |
1532 | len, be32_to_cpu(common->cap_type), | |
1533 | be16_to_cpu(common->length)); | |
1534 | ||
1535 | cap_len = be16_to_cpu(common->length); | |
1536 | if (cap_len > len) { | |
1537 | dev_err(&vscsi->dev, "cap_mad: cap len mismatch with total len\n"); | |
1538 | status = VIOSRP_MAD_FAILED; | |
1539 | break; | |
1540 | } | |
1541 | ||
1542 | if (cap_len == 0) { | |
1543 | dev_err(&vscsi->dev, "cap_mad: cap len is 0\n"); | |
1544 | status = VIOSRP_MAD_FAILED; | |
1545 | break; | |
1546 | } | |
1547 | ||
1548 | switch (common->cap_type) { | |
1549 | default: | |
1550 | pr_debug("cap_mad: unsupported capability\n"); | |
1551 | common->server_support = 0; | |
1552 | flag = cpu_to_be32((u32)CAP_LIST_SUPPORTED); | |
1553 | cap->flags &= ~flag; | |
1554 | break; | |
1555 | } | |
1556 | ||
1557 | len = len - cap_len; | |
1558 | common = (struct mad_capability_common *) | |
1559 | ((char *)common + cap_len); | |
1560 | } | |
1561 | ||
1562 | mad->common.status = cpu_to_be16(status); | |
1563 | ||
1564 | dma_wmb(); | |
1565 | rc = h_copy_rdma(olen, vscsi->dds.window[LOCAL].liobn, token, | |
1566 | vscsi->dds.window[REMOTE].liobn, | |
1567 | be64_to_cpu(mad->buffer)); | |
1568 | ||
1569 | if (rc != H_SUCCESS) { | |
1570 | pr_debug("cap_mad: failed to copy to client, rc %ld\n", | |
1571 | rc); | |
1572 | ||
1573 | if (rc == H_PERMISSION) { | |
1574 | if (connection_broken(vscsi)) | |
1575 | flag_bits = (RESPONSE_Q_DOWN | | |
1576 | CLIENT_FAILED); | |
1577 | } | |
1578 | ||
1579 | pr_warn("cap_mad: error copying data to client, rc %ld\n", | |
1580 | rc); | |
1581 | ibmvscsis_post_disconnect(vscsi, | |
1582 | ERR_DISCONNECT_RECONNECT, | |
1583 | flag_bits); | |
1584 | } | |
1585 | } | |
1586 | ||
1587 | dma_free_coherent(&vscsi->dma_dev->dev, olen, cap, token); | |
1588 | ||
1589 | pr_debug("Leaving cap_mad, rc %ld, client_cap 0x%x\n", | |
1590 | rc, vscsi->client_cap); | |
1591 | ||
1592 | return rc; | |
1593 | } | |
1594 | ||
1595 | /** | |
1596 | * ibmvscsis_process_mad() - Service a MAnagement Data gram | |
1597 | * @vscsi: Pointer to our adapter structure | |
1598 | * @iue: Information Unit containing the MAD request | |
1599 | * | |
1600 | * Must be called with interrupt lock held. | |
1601 | */ | |
1602 | static long ibmvscsis_process_mad(struct scsi_info *vscsi, struct iu_entry *iue) | |
1603 | { | |
1604 | struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad; | |
1605 | struct viosrp_empty_iu *empty; | |
1606 | long rc = ADAPT_SUCCESS; | |
1607 | ||
1608 | switch (be32_to_cpu(mad->type)) { | |
1609 | case VIOSRP_EMPTY_IU_TYPE: | |
1610 | empty = &vio_iu(iue)->mad.empty_iu; | |
1611 | vscsi->empty_iu_id = be64_to_cpu(empty->buffer); | |
1612 | vscsi->empty_iu_tag = be64_to_cpu(empty->common.tag); | |
1613 | mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS); | |
1614 | break; | |
1615 | case VIOSRP_ADAPTER_INFO_TYPE: | |
1616 | rc = ibmvscsis_adapter_info(vscsi, iue); | |
1617 | break; | |
1618 | case VIOSRP_CAPABILITIES_TYPE: | |
1619 | rc = ibmvscsis_cap_mad(vscsi, iue); | |
1620 | break; | |
1621 | case VIOSRP_ENABLE_FAST_FAIL: | |
1622 | if (vscsi->state == CONNECTED) { | |
1623 | vscsi->fast_fail = true; | |
1624 | mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS); | |
1625 | } else { | |
1626 | pr_warn("fast fail mad sent after login\n"); | |
1627 | mad->status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1628 | } | |
1629 | break; | |
1630 | default: | |
1631 | mad->status = cpu_to_be16(VIOSRP_MAD_NOT_SUPPORTED); | |
1632 | break; | |
1633 | } | |
1634 | ||
1635 | return rc; | |
1636 | } | |
1637 | ||
1638 | /** | |
1639 | * srp_snd_msg_failed() - Handle an error when sending a response | |
1640 | * @vscsi: Pointer to our adapter structure | |
1641 | * @rc: The return code from the h_send_crq command | |
1642 | * | |
1643 | * Must be called with interrupt lock held. | |
1644 | */ | |
1645 | static void srp_snd_msg_failed(struct scsi_info *vscsi, long rc) | |
1646 | { | |
1647 | ktime_t kt; | |
1648 | ||
1649 | if (rc != H_DROPPED) { | |
1650 | ibmvscsis_free_cmd_qs(vscsi); | |
1651 | ||
1652 | if (rc == H_CLOSED) | |
1653 | vscsi->flags |= CLIENT_FAILED; | |
1654 | ||
1655 | /* don't flag the same problem multiple times */ | |
1656 | if (!(vscsi->flags & RESPONSE_Q_DOWN)) { | |
1657 | vscsi->flags |= RESPONSE_Q_DOWN; | |
1658 | if (!(vscsi->state & (ERR_DISCONNECT | | |
1659 | ERR_DISCONNECT_RECONNECT | | |
1660 | ERR_DISCONNECTED | UNDEFINED))) { | |
1661 | dev_err(&vscsi->dev, "snd_msg_failed: setting RESPONSE_Q_DOWN, state 0x%hx, flags 0x%x, rc %ld\n", | |
1662 | vscsi->state, vscsi->flags, rc); | |
1663 | } | |
1664 | ibmvscsis_post_disconnect(vscsi, | |
1665 | ERR_DISCONNECT_RECONNECT, 0); | |
1666 | } | |
1667 | return; | |
1668 | } | |
1669 | ||
1670 | /* | |
1671 | * The response queue is full. | |
1672 | * If the server is processing SRP requests, i.e. | |
1673 | * the client has successfully done an | |
1674 | * SRP_LOGIN, then it will wait forever for room in | |
1675 | * the queue. However if the system admin | |
1676 | * is attempting to unconfigure the server then one | |
1677 | * or more children will be in a state where | |
1678 | * they are being removed. So if there is even one | |
1679 | * child being removed then the driver assumes | |
1680 | * the system admin is attempting to break the | |
1681 | * connection with the client and MAX_TIMER_POPS | |
1682 | * is honored. | |
1683 | */ | |
1684 | if ((vscsi->rsp_q_timer.timer_pops < MAX_TIMER_POPS) || | |
1685 | (vscsi->state == SRP_PROCESSING)) { | |
1686 | pr_debug("snd_msg_failed: response queue full, flags 0x%x, timer started %d, pops %d\n", | |
1687 | vscsi->flags, (int)vscsi->rsp_q_timer.started, | |
1688 | vscsi->rsp_q_timer.timer_pops); | |
1689 | ||
1690 | /* | |
1691 | * Check if the timer is running; if it | |
1692 | * is not then start it up. | |
1693 | */ | |
1694 | if (!vscsi->rsp_q_timer.started) { | |
1695 | if (vscsi->rsp_q_timer.timer_pops < | |
1696 | MAX_TIMER_POPS) { | |
8b0e1953 | 1697 | kt = WAIT_NANO_SECONDS; |
88a678bb BL |
1698 | } else { |
1699 | /* | |
1700 | * slide the timeslice if the maximum | |
1701 | * timer pops have already happened | |
1702 | */ | |
1703 | kt = ktime_set(WAIT_SECONDS, 0); | |
1704 | } | |
1705 | ||
1706 | vscsi->rsp_q_timer.started = true; | |
1707 | hrtimer_start(&vscsi->rsp_q_timer.timer, kt, | |
1708 | HRTIMER_MODE_REL); | |
1709 | } | |
1710 | } else { | |
1711 | /* | |
1712 | * TBD: Do we need to worry about this? Need to get | |
1713 | * remove working. | |
1714 | */ | |
1715 | /* | |
1716 | * waited a long time and it appears the system admin | |
1717 | * is bring this driver down | |
1718 | */ | |
1719 | vscsi->flags |= RESPONSE_Q_DOWN; | |
1720 | ibmvscsis_free_cmd_qs(vscsi); | |
1721 | /* | |
1722 | * if the driver is already attempting to disconnect | |
1723 | * from the client and has already logged an error | |
1724 | * trace this event but don't put it in the error log | |
1725 | */ | |
1726 | if (!(vscsi->state & (ERR_DISCONNECT | | |
1727 | ERR_DISCONNECT_RECONNECT | | |
1728 | ERR_DISCONNECTED | UNDEFINED))) { | |
1729 | dev_err(&vscsi->dev, "client crq full too long\n"); | |
1730 | ibmvscsis_post_disconnect(vscsi, | |
1731 | ERR_DISCONNECT_RECONNECT, | |
1732 | 0); | |
1733 | } | |
1734 | } | |
1735 | } | |
1736 | ||
1737 | /** | |
1738 | * ibmvscsis_send_messages() - Send a Response | |
1739 | * @vscsi: Pointer to our adapter structure | |
1740 | * | |
1741 | * Send a response, first checking the waiting queue. Responses are | |
1742 | * sent in order they are received. If the response cannot be sent, | |
1743 | * because the client queue is full, it stays on the waiting queue. | |
1744 | * | |
1745 | * PRECONDITION: | |
1746 | * Called with interrupt lock held | |
1747 | */ | |
1748 | static void ibmvscsis_send_messages(struct scsi_info *vscsi) | |
1749 | { | |
1750 | u64 msg_hi = 0; | |
1751 | /* note do not attmempt to access the IU_data_ptr with this pointer | |
1752 | * it is not valid | |
1753 | */ | |
1754 | struct viosrp_crq *crq = (struct viosrp_crq *)&msg_hi; | |
1755 | struct ibmvscsis_cmd *cmd, *nxt; | |
1756 | struct iu_entry *iue; | |
1757 | long rc = ADAPT_SUCCESS; | |
1758 | ||
1759 | if (!(vscsi->flags & RESPONSE_Q_DOWN)) { | |
1760 | list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp, list) { | |
88a678bb BL |
1761 | iue = cmd->iue; |
1762 | ||
1763 | crq->valid = VALID_CMD_RESP_EL; | |
1764 | crq->format = cmd->rsp.format; | |
1765 | ||
1766 | if (cmd->flags & CMD_FAST_FAIL) | |
1767 | crq->status = VIOSRP_ADAPTER_FAIL; | |
1768 | ||
1769 | crq->IU_length = cpu_to_be16(cmd->rsp.len); | |
1770 | ||
1771 | rc = h_send_crq(vscsi->dma_dev->unit_address, | |
1772 | be64_to_cpu(msg_hi), | |
1773 | be64_to_cpu(cmd->rsp.tag)); | |
1774 | ||
c9b3379f MC |
1775 | pr_debug("send_messages: cmd %p, tag 0x%llx, rc %ld\n", |
1776 | cmd, be64_to_cpu(cmd->rsp.tag), rc); | |
88a678bb BL |
1777 | |
1778 | /* if all ok free up the command element resources */ | |
1779 | if (rc == H_SUCCESS) { | |
1780 | /* some movement has occurred */ | |
1781 | vscsi->rsp_q_timer.timer_pops = 0; | |
1782 | list_del(&cmd->list); | |
1783 | ||
1784 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
1785 | } else { | |
1786 | srp_snd_msg_failed(vscsi, rc); | |
1787 | break; | |
1788 | } | |
1789 | } | |
1790 | ||
1791 | if (!rc) { | |
1792 | /* | |
1793 | * The timer could pop with the queue empty. If | |
1794 | * this happens, rc will always indicate a | |
1795 | * success; clear the pop count. | |
1796 | */ | |
1797 | vscsi->rsp_q_timer.timer_pops = 0; | |
1798 | } | |
1799 | } else { | |
1800 | ibmvscsis_free_cmd_qs(vscsi); | |
1801 | } | |
1802 | } | |
1803 | ||
1804 | /* Called with intr lock held */ | |
1805 | static void ibmvscsis_send_mad_resp(struct scsi_info *vscsi, | |
1806 | struct ibmvscsis_cmd *cmd, | |
1807 | struct viosrp_crq *crq) | |
1808 | { | |
1809 | struct iu_entry *iue = cmd->iue; | |
1810 | struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad; | |
1811 | uint flag_bits = 0; | |
1812 | long rc; | |
1813 | ||
1814 | dma_wmb(); | |
1815 | rc = h_copy_rdma(sizeof(struct mad_common), | |
1816 | vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma, | |
1817 | vscsi->dds.window[REMOTE].liobn, | |
1818 | be64_to_cpu(crq->IU_data_ptr)); | |
1819 | if (!rc) { | |
1820 | cmd->rsp.format = VIOSRP_MAD_FORMAT; | |
1821 | cmd->rsp.len = sizeof(struct mad_common); | |
1822 | cmd->rsp.tag = mad->tag; | |
1823 | list_add_tail(&cmd->list, &vscsi->waiting_rsp); | |
1824 | ibmvscsis_send_messages(vscsi); | |
1825 | } else { | |
1826 | pr_debug("Error sending mad response, rc %ld\n", rc); | |
1827 | if (rc == H_PERMISSION) { | |
1828 | if (connection_broken(vscsi)) | |
1829 | flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED); | |
1830 | } | |
1831 | dev_err(&vscsi->dev, "mad: failed to copy to client, rc %ld\n", | |
1832 | rc); | |
1833 | ||
1834 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
1835 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, | |
1836 | flag_bits); | |
1837 | } | |
1838 | } | |
1839 | ||
1840 | /** | |
1841 | * ibmvscsis_mad() - Service a MAnagement Data gram. | |
1842 | * @vscsi: Pointer to our adapter structure | |
1843 | * @crq: Pointer to the CRQ entry containing the MAD request | |
1844 | * | |
1845 | * EXECUTION ENVIRONMENT: | |
79fac9c9 | 1846 | * Interrupt, called with adapter lock held |
88a678bb BL |
1847 | */ |
1848 | static long ibmvscsis_mad(struct scsi_info *vscsi, struct viosrp_crq *crq) | |
1849 | { | |
1850 | struct iu_entry *iue; | |
1851 | struct ibmvscsis_cmd *cmd; | |
1852 | struct mad_common *mad; | |
1853 | long rc = ADAPT_SUCCESS; | |
1854 | ||
1855 | switch (vscsi->state) { | |
1856 | /* | |
1857 | * We have not exchanged Init Msgs yet, so this MAD was sent | |
1858 | * before the last Transport Event; client will not be | |
1859 | * expecting a response. | |
1860 | */ | |
1861 | case WAIT_CONNECTION: | |
1862 | pr_debug("mad: in Wait Connection state, ignoring MAD, flags %d\n", | |
1863 | vscsi->flags); | |
1864 | return ADAPT_SUCCESS; | |
1865 | ||
1866 | case SRP_PROCESSING: | |
1867 | case CONNECTED: | |
1868 | break; | |
1869 | ||
1870 | /* | |
1871 | * We should never get here while we're in these states. | |
1872 | * Just log an error and get out. | |
1873 | */ | |
1874 | case UNCONFIGURING: | |
1875 | case WAIT_IDLE: | |
1876 | case ERR_DISCONNECT: | |
1877 | case ERR_DISCONNECT_RECONNECT: | |
1878 | default: | |
1879 | dev_err(&vscsi->dev, "mad: invalid adapter state %d for mad\n", | |
1880 | vscsi->state); | |
1881 | return ADAPT_SUCCESS; | |
1882 | } | |
1883 | ||
1884 | cmd = ibmvscsis_get_free_cmd(vscsi); | |
1885 | if (!cmd) { | |
1886 | dev_err(&vscsi->dev, "mad: failed to get cmd, debit %d\n", | |
1887 | vscsi->debit); | |
1888 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
1889 | return ERROR; | |
1890 | } | |
1891 | iue = cmd->iue; | |
1892 | cmd->type = ADAPTER_MAD; | |
1893 | ||
1894 | rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq); | |
1895 | if (!rc) { | |
1896 | mad = (struct mad_common *)&vio_iu(iue)->mad; | |
1897 | ||
1898 | pr_debug("mad: type %d\n", be32_to_cpu(mad->type)); | |
1899 | ||
11950d70 | 1900 | rc = ibmvscsis_process_mad(vscsi, iue); |
88a678bb BL |
1901 | |
1902 | pr_debug("mad: status %hd, rc %ld\n", be16_to_cpu(mad->status), | |
1903 | rc); | |
1904 | ||
1905 | if (!rc) | |
1906 | ibmvscsis_send_mad_resp(vscsi, cmd, crq); | |
1907 | } else { | |
1908 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
1909 | } | |
1910 | ||
1911 | pr_debug("Leaving mad, rc %ld\n", rc); | |
1912 | return rc; | |
1913 | } | |
1914 | ||
1915 | /** | |
1916 | * ibmvscsis_login_rsp() - Create/copy a login response notice to the client | |
1917 | * @vscsi: Pointer to our adapter structure | |
1918 | * @cmd: Pointer to the command for the SRP Login request | |
1919 | * | |
1920 | * EXECUTION ENVIRONMENT: | |
1921 | * Interrupt, interrupt lock held | |
1922 | */ | |
1923 | static long ibmvscsis_login_rsp(struct scsi_info *vscsi, | |
1924 | struct ibmvscsis_cmd *cmd) | |
1925 | { | |
1926 | struct iu_entry *iue = cmd->iue; | |
1927 | struct srp_login_rsp *rsp = &vio_iu(iue)->srp.login_rsp; | |
1928 | struct format_code *fmt; | |
1929 | uint flag_bits = 0; | |
1930 | long rc = ADAPT_SUCCESS; | |
1931 | ||
1932 | memset(rsp, 0, sizeof(struct srp_login_rsp)); | |
1933 | ||
1934 | rsp->opcode = SRP_LOGIN_RSP; | |
1935 | rsp->req_lim_delta = cpu_to_be32(vscsi->request_limit); | |
1936 | rsp->tag = cmd->rsp.tag; | |
1937 | rsp->max_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN); | |
1938 | rsp->max_ti_iu_len = cpu_to_be32(SRP_MAX_IU_LEN); | |
1939 | fmt = (struct format_code *)&rsp->buf_fmt; | |
1940 | fmt->buffers = SUPPORTED_FORMATS; | |
1941 | vscsi->credit = 0; | |
1942 | ||
1943 | cmd->rsp.len = sizeof(struct srp_login_rsp); | |
1944 | ||
1945 | dma_wmb(); | |
1946 | rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn, | |
1947 | iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn, | |
1948 | be64_to_cpu(iue->remote_token)); | |
1949 | ||
1950 | switch (rc) { | |
1951 | case H_SUCCESS: | |
1952 | break; | |
1953 | ||
1954 | case H_PERMISSION: | |
1955 | if (connection_broken(vscsi)) | |
1956 | flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED; | |
1957 | dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n", | |
1958 | rc); | |
1959 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, | |
1960 | flag_bits); | |
1961 | break; | |
1962 | case H_SOURCE_PARM: | |
1963 | case H_DEST_PARM: | |
1964 | default: | |
1965 | dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n", | |
1966 | rc); | |
1967 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
1968 | break; | |
1969 | } | |
1970 | ||
1971 | return rc; | |
1972 | } | |
1973 | ||
1974 | /** | |
1975 | * ibmvscsis_srp_login_rej() - Create/copy a login rejection notice to client | |
1976 | * @vscsi: Pointer to our adapter structure | |
1977 | * @cmd: Pointer to the command for the SRP Login request | |
1978 | * @reason: The reason the SRP Login is being rejected, per SRP protocol | |
1979 | * | |
1980 | * EXECUTION ENVIRONMENT: | |
1981 | * Interrupt, interrupt lock held | |
1982 | */ | |
1983 | static long ibmvscsis_srp_login_rej(struct scsi_info *vscsi, | |
1984 | struct ibmvscsis_cmd *cmd, u32 reason) | |
1985 | { | |
1986 | struct iu_entry *iue = cmd->iue; | |
1987 | struct srp_login_rej *rej = &vio_iu(iue)->srp.login_rej; | |
1988 | struct format_code *fmt; | |
1989 | uint flag_bits = 0; | |
1990 | long rc = ADAPT_SUCCESS; | |
1991 | ||
1992 | memset(rej, 0, sizeof(*rej)); | |
1993 | ||
1994 | rej->opcode = SRP_LOGIN_REJ; | |
1995 | rej->reason = cpu_to_be32(reason); | |
1996 | rej->tag = cmd->rsp.tag; | |
1997 | fmt = (struct format_code *)&rej->buf_fmt; | |
1998 | fmt->buffers = SUPPORTED_FORMATS; | |
1999 | ||
2000 | cmd->rsp.len = sizeof(*rej); | |
2001 | ||
2002 | dma_wmb(); | |
2003 | rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn, | |
2004 | iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn, | |
2005 | be64_to_cpu(iue->remote_token)); | |
2006 | ||
2007 | switch (rc) { | |
2008 | case H_SUCCESS: | |
2009 | break; | |
2010 | case H_PERMISSION: | |
2011 | if (connection_broken(vscsi)) | |
79fac9c9 | 2012 | flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED; |
88a678bb BL |
2013 | dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n", |
2014 | rc); | |
2015 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, | |
2016 | flag_bits); | |
2017 | break; | |
2018 | case H_SOURCE_PARM: | |
2019 | case H_DEST_PARM: | |
2020 | default: | |
2021 | dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n", | |
2022 | rc); | |
2023 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2024 | break; | |
2025 | } | |
2026 | ||
2027 | return rc; | |
2028 | } | |
2029 | ||
2030 | static int ibmvscsis_make_nexus(struct ibmvscsis_tport *tport) | |
2031 | { | |
2032 | char *name = tport->tport_name; | |
2033 | struct ibmvscsis_nexus *nexus; | |
2034 | int rc; | |
2035 | ||
2036 | if (tport->ibmv_nexus) { | |
2037 | pr_debug("tport->ibmv_nexus already exists\n"); | |
2038 | return 0; | |
2039 | } | |
2040 | ||
2041 | nexus = kzalloc(sizeof(*nexus), GFP_KERNEL); | |
2042 | if (!nexus) { | |
2043 | pr_err("Unable to allocate struct ibmvscsis_nexus\n"); | |
2044 | return -ENOMEM; | |
2045 | } | |
2046 | ||
2047 | nexus->se_sess = target_alloc_session(&tport->se_tpg, 0, 0, | |
2048 | TARGET_PROT_NORMAL, name, nexus, | |
2049 | NULL); | |
2050 | if (IS_ERR(nexus->se_sess)) { | |
2051 | rc = PTR_ERR(nexus->se_sess); | |
2052 | goto transport_init_fail; | |
2053 | } | |
2054 | ||
2055 | tport->ibmv_nexus = nexus; | |
2056 | ||
2057 | return 0; | |
2058 | ||
2059 | transport_init_fail: | |
2060 | kfree(nexus); | |
2061 | return rc; | |
2062 | } | |
2063 | ||
2064 | static int ibmvscsis_drop_nexus(struct ibmvscsis_tport *tport) | |
2065 | { | |
2066 | struct se_session *se_sess; | |
2067 | struct ibmvscsis_nexus *nexus; | |
2068 | ||
2069 | nexus = tport->ibmv_nexus; | |
2070 | if (!nexus) | |
2071 | return -ENODEV; | |
2072 | ||
2073 | se_sess = nexus->se_sess; | |
2074 | if (!se_sess) | |
2075 | return -ENODEV; | |
2076 | ||
2077 | /* | |
2078 | * Release the SCSI I_T Nexus to the emulated ibmvscsis Target Port | |
2079 | */ | |
712db3eb BL |
2080 | target_wait_for_sess_cmds(se_sess); |
2081 | transport_deregister_session_configfs(se_sess); | |
88a678bb BL |
2082 | transport_deregister_session(se_sess); |
2083 | tport->ibmv_nexus = NULL; | |
2084 | kfree(nexus); | |
2085 | ||
2086 | return 0; | |
2087 | } | |
2088 | ||
2089 | /** | |
2090 | * ibmvscsis_srp_login() - Process an SRP Login Request | |
2091 | * @vscsi: Pointer to our adapter structure | |
2092 | * @cmd: Command element to use to process the SRP Login request | |
2093 | * @crq: Pointer to CRQ entry containing the SRP Login request | |
2094 | * | |
2095 | * EXECUTION ENVIRONMENT: | |
2096 | * Interrupt, called with interrupt lock held | |
2097 | */ | |
2098 | static long ibmvscsis_srp_login(struct scsi_info *vscsi, | |
2099 | struct ibmvscsis_cmd *cmd, | |
2100 | struct viosrp_crq *crq) | |
2101 | { | |
2102 | struct iu_entry *iue = cmd->iue; | |
2103 | struct srp_login_req *req = &vio_iu(iue)->srp.login_req; | |
2104 | struct port_id { | |
2105 | __be64 id_extension; | |
2106 | __be64 io_guid; | |
2107 | } *iport, *tport; | |
2108 | struct format_code *fmt; | |
2109 | u32 reason = 0x0; | |
2110 | long rc = ADAPT_SUCCESS; | |
2111 | ||
2112 | iport = (struct port_id *)req->initiator_port_id; | |
2113 | tport = (struct port_id *)req->target_port_id; | |
2114 | fmt = (struct format_code *)&req->req_buf_fmt; | |
2115 | if (be32_to_cpu(req->req_it_iu_len) > SRP_MAX_IU_LEN) | |
2116 | reason = SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE; | |
2117 | else if (be32_to_cpu(req->req_it_iu_len) < 64) | |
2118 | reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL; | |
2119 | else if ((be64_to_cpu(iport->id_extension) > (MAX_NUM_PORTS - 1)) || | |
2120 | (be64_to_cpu(tport->id_extension) > (MAX_NUM_PORTS - 1))) | |
2121 | reason = SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL; | |
2122 | else if (req->req_flags & SRP_MULTICHAN_MULTI) | |
2123 | reason = SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED; | |
2124 | else if (fmt->buffers & (~SUPPORTED_FORMATS)) | |
2125 | reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT; | |
f6dbe38e | 2126 | else if ((fmt->buffers & SUPPORTED_FORMATS) == 0) |
88a678bb BL |
2127 | reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT; |
2128 | ||
2129 | if (vscsi->state == SRP_PROCESSING) | |
2130 | reason = SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED; | |
2131 | ||
2132 | rc = ibmvscsis_make_nexus(&vscsi->tport); | |
2133 | if (rc) | |
2134 | reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL; | |
2135 | ||
2136 | cmd->rsp.format = VIOSRP_SRP_FORMAT; | |
2137 | cmd->rsp.tag = req->tag; | |
2138 | ||
2139 | pr_debug("srp_login: reason 0x%x\n", reason); | |
2140 | ||
2141 | if (reason) | |
2142 | rc = ibmvscsis_srp_login_rej(vscsi, cmd, reason); | |
2143 | else | |
2144 | rc = ibmvscsis_login_rsp(vscsi, cmd); | |
2145 | ||
2146 | if (!rc) { | |
2147 | if (!reason) | |
2148 | vscsi->state = SRP_PROCESSING; | |
2149 | ||
2150 | list_add_tail(&cmd->list, &vscsi->waiting_rsp); | |
2151 | ibmvscsis_send_messages(vscsi); | |
2152 | } else { | |
2153 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2154 | } | |
2155 | ||
2156 | pr_debug("Leaving srp_login, rc %ld\n", rc); | |
2157 | return rc; | |
2158 | } | |
2159 | ||
2160 | /** | |
2161 | * ibmvscsis_srp_i_logout() - Helper Function to close I_T Nexus | |
2162 | * @vscsi: Pointer to our adapter structure | |
2163 | * @cmd: Command element to use to process the Implicit Logout request | |
2164 | * @crq: Pointer to CRQ entry containing the Implicit Logout request | |
2165 | * | |
2166 | * Do the logic to close the I_T nexus. This function may not | |
2167 | * behave to specification. | |
2168 | * | |
2169 | * EXECUTION ENVIRONMENT: | |
2170 | * Interrupt, interrupt lock held | |
2171 | */ | |
2172 | static long ibmvscsis_srp_i_logout(struct scsi_info *vscsi, | |
2173 | struct ibmvscsis_cmd *cmd, | |
2174 | struct viosrp_crq *crq) | |
2175 | { | |
2176 | struct iu_entry *iue = cmd->iue; | |
2177 | struct srp_i_logout *log_out = &vio_iu(iue)->srp.i_logout; | |
2178 | long rc = ADAPT_SUCCESS; | |
2179 | ||
2180 | if ((vscsi->debit > 0) || !list_empty(&vscsi->schedule_q) || | |
2181 | !list_empty(&vscsi->waiting_rsp)) { | |
2182 | dev_err(&vscsi->dev, "i_logout: outstanding work\n"); | |
2183 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); | |
2184 | } else { | |
2185 | cmd->rsp.format = SRP_FORMAT; | |
2186 | cmd->rsp.tag = log_out->tag; | |
2187 | cmd->rsp.len = sizeof(struct mad_common); | |
2188 | list_add_tail(&cmd->list, &vscsi->waiting_rsp); | |
2189 | ibmvscsis_send_messages(vscsi); | |
2190 | ||
2191 | ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0); | |
2192 | } | |
2193 | ||
2194 | return rc; | |
2195 | } | |
2196 | ||
2197 | /* Called with intr lock held */ | |
2198 | static void ibmvscsis_srp_cmd(struct scsi_info *vscsi, struct viosrp_crq *crq) | |
2199 | { | |
2200 | struct ibmvscsis_cmd *cmd; | |
2201 | struct iu_entry *iue; | |
2202 | struct srp_cmd *srp; | |
2203 | struct srp_tsk_mgmt *tsk; | |
2204 | long rc; | |
2205 | ||
2206 | if (vscsi->request_limit - vscsi->debit <= 0) { | |
2207 | /* Client has exceeded request limit */ | |
2208 | dev_err(&vscsi->dev, "Client exceeded the request limit (%d), debit %d\n", | |
2209 | vscsi->request_limit, vscsi->debit); | |
2210 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2211 | return; | |
2212 | } | |
2213 | ||
2214 | cmd = ibmvscsis_get_free_cmd(vscsi); | |
2215 | if (!cmd) { | |
2216 | dev_err(&vscsi->dev, "srp_cmd failed to get cmd, debit %d\n", | |
2217 | vscsi->debit); | |
2218 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2219 | return; | |
2220 | } | |
2221 | iue = cmd->iue; | |
2222 | srp = &vio_iu(iue)->srp.cmd; | |
2223 | ||
2224 | rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq); | |
2225 | if (rc) { | |
2226 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2227 | return; | |
2228 | } | |
2229 | ||
2230 | if (vscsi->state == SRP_PROCESSING) { | |
2231 | switch (srp->opcode) { | |
2232 | case SRP_LOGIN_REQ: | |
2233 | rc = ibmvscsis_srp_login(vscsi, cmd, crq); | |
2234 | break; | |
2235 | ||
2236 | case SRP_TSK_MGMT: | |
2237 | tsk = &vio_iu(iue)->srp.tsk_mgmt; | |
2238 | pr_debug("tsk_mgmt tag: %llu (0x%llx)\n", tsk->tag, | |
2239 | tsk->tag); | |
2240 | cmd->rsp.tag = tsk->tag; | |
2241 | vscsi->debit += 1; | |
2242 | cmd->type = TASK_MANAGEMENT; | |
2243 | list_add_tail(&cmd->list, &vscsi->schedule_q); | |
2244 | queue_work(vscsi->work_q, &cmd->work); | |
2245 | break; | |
2246 | ||
2247 | case SRP_CMD: | |
2248 | pr_debug("srp_cmd tag: %llu (0x%llx)\n", srp->tag, | |
2249 | srp->tag); | |
2250 | cmd->rsp.tag = srp->tag; | |
2251 | vscsi->debit += 1; | |
2252 | cmd->type = SCSI_CDB; | |
2253 | /* | |
2254 | * We want to keep track of work waiting for | |
2255 | * the workqueue. | |
2256 | */ | |
2257 | list_add_tail(&cmd->list, &vscsi->schedule_q); | |
2258 | queue_work(vscsi->work_q, &cmd->work); | |
2259 | break; | |
2260 | ||
2261 | case SRP_I_LOGOUT: | |
2262 | rc = ibmvscsis_srp_i_logout(vscsi, cmd, crq); | |
2263 | break; | |
2264 | ||
2265 | case SRP_CRED_RSP: | |
2266 | case SRP_AER_RSP: | |
2267 | default: | |
2268 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2269 | dev_err(&vscsi->dev, "invalid srp cmd, opcode %d\n", | |
2270 | (uint)srp->opcode); | |
2271 | ibmvscsis_post_disconnect(vscsi, | |
2272 | ERR_DISCONNECT_RECONNECT, 0); | |
2273 | break; | |
2274 | } | |
2275 | } else if (srp->opcode == SRP_LOGIN_REQ && vscsi->state == CONNECTED) { | |
2276 | rc = ibmvscsis_srp_login(vscsi, cmd, crq); | |
2277 | } else { | |
2278 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2279 | dev_err(&vscsi->dev, "Invalid state %d to handle srp cmd\n", | |
2280 | vscsi->state); | |
2281 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2282 | } | |
2283 | } | |
2284 | ||
2285 | /** | |
2286 | * ibmvscsis_ping_response() - Respond to a ping request | |
2287 | * @vscsi: Pointer to our adapter structure | |
2288 | * | |
2289 | * Let the client know that the server is alive and waiting on | |
2290 | * its native I/O stack. | |
2291 | * If any type of error occurs from the call to queue a ping | |
2292 | * response then the client is either not accepting or receiving | |
2293 | * interrupts. Disconnect with an error. | |
2294 | * | |
2295 | * EXECUTION ENVIRONMENT: | |
2296 | * Interrupt, interrupt lock held | |
2297 | */ | |
2298 | static long ibmvscsis_ping_response(struct scsi_info *vscsi) | |
2299 | { | |
2300 | struct viosrp_crq *crq; | |
2301 | u64 buffer[2] = { 0, 0 }; | |
2302 | long rc; | |
2303 | ||
2304 | crq = (struct viosrp_crq *)&buffer; | |
2305 | crq->valid = VALID_CMD_RESP_EL; | |
2306 | crq->format = (u8)MESSAGE_IN_CRQ; | |
2307 | crq->status = PING_RESPONSE; | |
2308 | ||
2309 | rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]), | |
2310 | cpu_to_be64(buffer[MSG_LOW])); | |
2311 | ||
2312 | switch (rc) { | |
2313 | case H_SUCCESS: | |
2314 | break; | |
2315 | case H_CLOSED: | |
2316 | vscsi->flags |= CLIENT_FAILED; | |
2317 | case H_DROPPED: | |
2318 | vscsi->flags |= RESPONSE_Q_DOWN; | |
2319 | case H_REMOTE_PARM: | |
2320 | dev_err(&vscsi->dev, "ping_response: h_send_crq failed, rc %ld\n", | |
2321 | rc); | |
2322 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2323 | break; | |
2324 | default: | |
2325 | dev_err(&vscsi->dev, "ping_response: h_send_crq returned unknown rc %ld\n", | |
2326 | rc); | |
2327 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); | |
2328 | break; | |
2329 | } | |
2330 | ||
2331 | return rc; | |
2332 | } | |
2333 | ||
88a678bb BL |
2334 | /** |
2335 | * ibmvscsis_parse_command() - Parse an element taken from the cmd rsp queue. | |
2336 | * @vscsi: Pointer to our adapter structure | |
2337 | * @crq: Pointer to CRQ element containing the SRP request | |
2338 | * | |
2339 | * This function will return success if the command queue element is valid | |
2340 | * and the srp iu or MAD request it pointed to was also valid. That does | |
2341 | * not mean that an error was not returned to the client. | |
2342 | * | |
2343 | * EXECUTION ENVIRONMENT: | |
2344 | * Interrupt, intr lock held | |
2345 | */ | |
2346 | static long ibmvscsis_parse_command(struct scsi_info *vscsi, | |
2347 | struct viosrp_crq *crq) | |
2348 | { | |
2349 | long rc = ADAPT_SUCCESS; | |
2350 | ||
2351 | switch (crq->valid) { | |
2352 | case VALID_CMD_RESP_EL: | |
2353 | switch (crq->format) { | |
2354 | case OS400_FORMAT: | |
2355 | case AIX_FORMAT: | |
2356 | case LINUX_FORMAT: | |
2357 | case MAD_FORMAT: | |
2358 | if (vscsi->flags & PROCESSING_MAD) { | |
2359 | rc = ERROR; | |
2360 | dev_err(&vscsi->dev, "parse_command: already processing mad\n"); | |
2361 | ibmvscsis_post_disconnect(vscsi, | |
2362 | ERR_DISCONNECT_RECONNECT, | |
2363 | 0); | |
2364 | } else { | |
2365 | vscsi->flags |= PROCESSING_MAD; | |
2366 | rc = ibmvscsis_mad(vscsi, crq); | |
2367 | } | |
2368 | break; | |
2369 | ||
2370 | case SRP_FORMAT: | |
2371 | ibmvscsis_srp_cmd(vscsi, crq); | |
2372 | break; | |
2373 | ||
2374 | case MESSAGE_IN_CRQ: | |
2375 | if (crq->status == PING) | |
2376 | ibmvscsis_ping_response(vscsi); | |
2377 | break; | |
2378 | ||
2379 | default: | |
2380 | dev_err(&vscsi->dev, "parse_command: invalid format %d\n", | |
2381 | (uint)crq->format); | |
2382 | ibmvscsis_post_disconnect(vscsi, | |
2383 | ERR_DISCONNECT_RECONNECT, 0); | |
2384 | break; | |
2385 | } | |
2386 | break; | |
2387 | ||
2388 | case VALID_TRANS_EVENT: | |
79fac9c9 | 2389 | rc = ibmvscsis_trans_event(vscsi, crq); |
88a678bb BL |
2390 | break; |
2391 | ||
2392 | case VALID_INIT_MSG: | |
2393 | rc = ibmvscsis_init_msg(vscsi, crq); | |
2394 | break; | |
2395 | ||
2396 | default: | |
2397 | dev_err(&vscsi->dev, "parse_command: invalid valid field %d\n", | |
2398 | (uint)crq->valid); | |
2399 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2400 | break; | |
2401 | } | |
2402 | ||
2403 | /* | |
2404 | * Return only what the interrupt handler cares | |
2405 | * about. Most errors we keep right on trucking. | |
2406 | */ | |
2407 | rc = vscsi->flags & SCHEDULE_DISCONNECT; | |
2408 | ||
2409 | return rc; | |
2410 | } | |
2411 | ||
2412 | static int read_dma_window(struct scsi_info *vscsi) | |
2413 | { | |
2414 | struct vio_dev *vdev = vscsi->dma_dev; | |
2415 | const __be32 *dma_window; | |
2416 | const __be32 *prop; | |
2417 | ||
2418 | /* TODO Using of_parse_dma_window would be better, but it doesn't give | |
2419 | * a way to read multiple windows without already knowing the size of | |
2420 | * a window or the number of windows. | |
2421 | */ | |
2422 | dma_window = (const __be32 *)vio_get_attribute(vdev, | |
2423 | "ibm,my-dma-window", | |
2424 | NULL); | |
2425 | if (!dma_window) { | |
2426 | pr_err("Couldn't find ibm,my-dma-window property\n"); | |
2427 | return -1; | |
2428 | } | |
2429 | ||
2430 | vscsi->dds.window[LOCAL].liobn = be32_to_cpu(*dma_window); | |
2431 | dma_window++; | |
2432 | ||
2433 | prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-address-cells", | |
2434 | NULL); | |
2435 | if (!prop) { | |
2436 | pr_warn("Couldn't find ibm,#dma-address-cells property\n"); | |
2437 | dma_window++; | |
2438 | } else { | |
2439 | dma_window += be32_to_cpu(*prop); | |
2440 | } | |
2441 | ||
2442 | prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-size-cells", | |
2443 | NULL); | |
2444 | if (!prop) { | |
2445 | pr_warn("Couldn't find ibm,#dma-size-cells property\n"); | |
2446 | dma_window++; | |
2447 | } else { | |
2448 | dma_window += be32_to_cpu(*prop); | |
2449 | } | |
2450 | ||
2451 | /* dma_window should point to the second window now */ | |
2452 | vscsi->dds.window[REMOTE].liobn = be32_to_cpu(*dma_window); | |
2453 | ||
2454 | return 0; | |
2455 | } | |
2456 | ||
2457 | static struct ibmvscsis_tport *ibmvscsis_lookup_port(const char *name) | |
2458 | { | |
2459 | struct ibmvscsis_tport *tport = NULL; | |
2460 | struct vio_dev *vdev; | |
2461 | struct scsi_info *vscsi; | |
2462 | ||
2463 | spin_lock_bh(&ibmvscsis_dev_lock); | |
2464 | list_for_each_entry(vscsi, &ibmvscsis_dev_list, list) { | |
2465 | vdev = vscsi->dma_dev; | |
2466 | if (!strcmp(dev_name(&vdev->dev), name)) { | |
2467 | tport = &vscsi->tport; | |
2468 | break; | |
2469 | } | |
2470 | } | |
2471 | spin_unlock_bh(&ibmvscsis_dev_lock); | |
2472 | ||
2473 | return tport; | |
2474 | } | |
2475 | ||
2476 | /** | |
2477 | * ibmvscsis_parse_cmd() - Parse SRP Command | |
2478 | * @vscsi: Pointer to our adapter structure | |
2479 | * @cmd: Pointer to command element with SRP command | |
2480 | * | |
2481 | * Parse the srp command; if it is valid then submit it to tcm. | |
2482 | * Note: The return code does not reflect the status of the SCSI CDB. | |
2483 | * | |
2484 | * EXECUTION ENVIRONMENT: | |
2485 | * Process level | |
2486 | */ | |
2487 | static void ibmvscsis_parse_cmd(struct scsi_info *vscsi, | |
2488 | struct ibmvscsis_cmd *cmd) | |
2489 | { | |
2490 | struct iu_entry *iue = cmd->iue; | |
2491 | struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf; | |
2492 | struct ibmvscsis_nexus *nexus; | |
2493 | u64 data_len = 0; | |
2494 | enum dma_data_direction dir; | |
2495 | int attr = 0; | |
2496 | int rc = 0; | |
2497 | ||
2498 | nexus = vscsi->tport.ibmv_nexus; | |
2499 | /* | |
2500 | * additional length in bytes. Note that the SRP spec says that | |
2501 | * additional length is in 4-byte words, but technically the | |
2502 | * additional length field is only the upper 6 bits of the byte. | |
2503 | * The lower 2 bits are reserved. If the lower 2 bits are 0 (as | |
2504 | * all reserved fields should be), then interpreting the byte as | |
2505 | * an int will yield the length in bytes. | |
2506 | */ | |
2507 | if (srp->add_cdb_len & 0x03) { | |
2508 | dev_err(&vscsi->dev, "parse_cmd: reserved bits set in IU\n"); | |
2509 | spin_lock_bh(&vscsi->intr_lock); | |
2510 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2511 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2512 | spin_unlock_bh(&vscsi->intr_lock); | |
2513 | return; | |
2514 | } | |
2515 | ||
2516 | if (srp_get_desc_table(srp, &dir, &data_len)) { | |
2517 | dev_err(&vscsi->dev, "0x%llx: parsing SRP descriptor table failed.\n", | |
2518 | srp->tag); | |
2519 | goto fail; | |
88a678bb BL |
2520 | } |
2521 | ||
2522 | cmd->rsp.sol_not = srp->sol_not; | |
2523 | ||
2524 | switch (srp->task_attr) { | |
2525 | case SRP_SIMPLE_TASK: | |
2526 | attr = TCM_SIMPLE_TAG; | |
2527 | break; | |
2528 | case SRP_ORDERED_TASK: | |
2529 | attr = TCM_ORDERED_TAG; | |
2530 | break; | |
2531 | case SRP_HEAD_TASK: | |
2532 | attr = TCM_HEAD_TAG; | |
2533 | break; | |
2534 | case SRP_ACA_TASK: | |
2535 | attr = TCM_ACA_TAG; | |
2536 | break; | |
2537 | default: | |
2538 | dev_err(&vscsi->dev, "Invalid task attribute %d\n", | |
2539 | srp->task_attr); | |
2540 | goto fail; | |
2541 | } | |
2542 | ||
2543 | cmd->se_cmd.tag = be64_to_cpu(srp->tag); | |
2544 | ||
2545 | spin_lock_bh(&vscsi->intr_lock); | |
2546 | list_add_tail(&cmd->list, &vscsi->active_q); | |
2547 | spin_unlock_bh(&vscsi->intr_lock); | |
2548 | ||
2549 | srp->lun.scsi_lun[0] &= 0x3f; | |
2550 | ||
88a678bb BL |
2551 | rc = target_submit_cmd(&cmd->se_cmd, nexus->se_sess, srp->cdb, |
2552 | cmd->sense_buf, scsilun_to_int(&srp->lun), | |
2553 | data_len, attr, dir, 0); | |
2554 | if (rc) { | |
2555 | dev_err(&vscsi->dev, "target_submit_cmd failed, rc %d\n", rc); | |
7435b32e MC |
2556 | spin_lock_bh(&vscsi->intr_lock); |
2557 | list_del(&cmd->list); | |
2558 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2559 | spin_unlock_bh(&vscsi->intr_lock); | |
88a678bb BL |
2560 | goto fail; |
2561 | } | |
2562 | return; | |
2563 | ||
2564 | fail: | |
2565 | spin_lock_bh(&vscsi->intr_lock); | |
2566 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2567 | spin_unlock_bh(&vscsi->intr_lock); | |
2568 | } | |
2569 | ||
2570 | /** | |
2571 | * ibmvscsis_parse_task() - Parse SRP Task Management Request | |
2572 | * @vscsi: Pointer to our adapter structure | |
2573 | * @cmd: Pointer to command element with SRP task management request | |
2574 | * | |
2575 | * Parse the srp task management request; if it is valid then submit it to tcm. | |
2576 | * Note: The return code does not reflect the status of the task management | |
2577 | * request. | |
2578 | * | |
2579 | * EXECUTION ENVIRONMENT: | |
2580 | * Processor level | |
2581 | */ | |
2582 | static void ibmvscsis_parse_task(struct scsi_info *vscsi, | |
2583 | struct ibmvscsis_cmd *cmd) | |
2584 | { | |
2585 | struct iu_entry *iue = cmd->iue; | |
2586 | struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt; | |
2587 | int tcm_type; | |
2588 | u64 tag_to_abort = 0; | |
2589 | int rc = 0; | |
2590 | struct ibmvscsis_nexus *nexus; | |
2591 | ||
2592 | nexus = vscsi->tport.ibmv_nexus; | |
2593 | ||
2594 | cmd->rsp.sol_not = srp_tsk->sol_not; | |
2595 | ||
2596 | switch (srp_tsk->tsk_mgmt_func) { | |
2597 | case SRP_TSK_ABORT_TASK: | |
2598 | tcm_type = TMR_ABORT_TASK; | |
2599 | tag_to_abort = be64_to_cpu(srp_tsk->task_tag); | |
2600 | break; | |
2601 | case SRP_TSK_ABORT_TASK_SET: | |
2602 | tcm_type = TMR_ABORT_TASK_SET; | |
2603 | break; | |
2604 | case SRP_TSK_CLEAR_TASK_SET: | |
2605 | tcm_type = TMR_CLEAR_TASK_SET; | |
2606 | break; | |
2607 | case SRP_TSK_LUN_RESET: | |
2608 | tcm_type = TMR_LUN_RESET; | |
2609 | break; | |
2610 | case SRP_TSK_CLEAR_ACA: | |
2611 | tcm_type = TMR_CLEAR_ACA; | |
2612 | break; | |
2613 | default: | |
2614 | dev_err(&vscsi->dev, "unknown task mgmt func %d\n", | |
2615 | srp_tsk->tsk_mgmt_func); | |
2616 | cmd->se_cmd.se_tmr_req->response = | |
2617 | TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; | |
2618 | rc = -1; | |
2619 | break; | |
2620 | } | |
2621 | ||
2622 | if (!rc) { | |
2623 | cmd->se_cmd.tag = be64_to_cpu(srp_tsk->tag); | |
2624 | ||
2625 | spin_lock_bh(&vscsi->intr_lock); | |
2626 | list_add_tail(&cmd->list, &vscsi->active_q); | |
2627 | spin_unlock_bh(&vscsi->intr_lock); | |
2628 | ||
2629 | srp_tsk->lun.scsi_lun[0] &= 0x3f; | |
2630 | ||
2631 | pr_debug("calling submit_tmr, func %d\n", | |
2632 | srp_tsk->tsk_mgmt_func); | |
2633 | rc = target_submit_tmr(&cmd->se_cmd, nexus->se_sess, NULL, | |
2634 | scsilun_to_int(&srp_tsk->lun), srp_tsk, | |
2635 | tcm_type, GFP_KERNEL, tag_to_abort, 0); | |
2636 | if (rc) { | |
2637 | dev_err(&vscsi->dev, "target_submit_tmr failed, rc %d\n", | |
2638 | rc); | |
7435b32e MC |
2639 | spin_lock_bh(&vscsi->intr_lock); |
2640 | list_del(&cmd->list); | |
2641 | spin_unlock_bh(&vscsi->intr_lock); | |
88a678bb BL |
2642 | cmd->se_cmd.se_tmr_req->response = |
2643 | TMR_FUNCTION_REJECTED; | |
2644 | } | |
2645 | } | |
2646 | ||
2647 | if (rc) | |
2648 | transport_send_check_condition_and_sense(&cmd->se_cmd, 0, 0); | |
2649 | } | |
2650 | ||
2651 | static void ibmvscsis_scheduler(struct work_struct *work) | |
2652 | { | |
2653 | struct ibmvscsis_cmd *cmd = container_of(work, struct ibmvscsis_cmd, | |
2654 | work); | |
2655 | struct scsi_info *vscsi = cmd->adapter; | |
2656 | ||
2657 | spin_lock_bh(&vscsi->intr_lock); | |
2658 | ||
2659 | /* Remove from schedule_q */ | |
2660 | list_del(&cmd->list); | |
2661 | ||
2662 | /* Don't submit cmd if we're disconnecting */ | |
2663 | if (vscsi->flags & (SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED)) { | |
2664 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2665 | ||
2666 | /* ibmvscsis_disconnect might be waiting for us */ | |
2667 | if (list_empty(&vscsi->active_q) && | |
2668 | list_empty(&vscsi->schedule_q) && | |
2669 | (vscsi->flags & WAIT_FOR_IDLE)) { | |
2670 | vscsi->flags &= ~WAIT_FOR_IDLE; | |
2671 | complete(&vscsi->wait_idle); | |
2672 | } | |
2673 | ||
2674 | spin_unlock_bh(&vscsi->intr_lock); | |
2675 | return; | |
2676 | } | |
2677 | ||
2678 | spin_unlock_bh(&vscsi->intr_lock); | |
2679 | ||
2680 | switch (cmd->type) { | |
2681 | case SCSI_CDB: | |
2682 | ibmvscsis_parse_cmd(vscsi, cmd); | |
2683 | break; | |
2684 | case TASK_MANAGEMENT: | |
2685 | ibmvscsis_parse_task(vscsi, cmd); | |
2686 | break; | |
2687 | default: | |
2688 | dev_err(&vscsi->dev, "scheduler, invalid cmd type %d\n", | |
2689 | cmd->type); | |
2690 | spin_lock_bh(&vscsi->intr_lock); | |
2691 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2692 | spin_unlock_bh(&vscsi->intr_lock); | |
2693 | break; | |
2694 | } | |
2695 | } | |
2696 | ||
2697 | static int ibmvscsis_alloc_cmds(struct scsi_info *vscsi, int num) | |
2698 | { | |
2699 | struct ibmvscsis_cmd *cmd; | |
2700 | int i; | |
2701 | ||
2702 | INIT_LIST_HEAD(&vscsi->free_cmd); | |
2703 | vscsi->cmd_pool = kcalloc(num, sizeof(struct ibmvscsis_cmd), | |
2704 | GFP_KERNEL); | |
2705 | if (!vscsi->cmd_pool) | |
2706 | return -ENOMEM; | |
2707 | ||
2708 | for (i = 0, cmd = (struct ibmvscsis_cmd *)vscsi->cmd_pool; i < num; | |
2709 | i++, cmd++) { | |
2710 | cmd->adapter = vscsi; | |
2711 | INIT_WORK(&cmd->work, ibmvscsis_scheduler); | |
2712 | list_add_tail(&cmd->list, &vscsi->free_cmd); | |
2713 | } | |
2714 | ||
2715 | return 0; | |
2716 | } | |
2717 | ||
2718 | static void ibmvscsis_free_cmds(struct scsi_info *vscsi) | |
2719 | { | |
2720 | kfree(vscsi->cmd_pool); | |
2721 | vscsi->cmd_pool = NULL; | |
2722 | INIT_LIST_HEAD(&vscsi->free_cmd); | |
2723 | } | |
2724 | ||
2725 | /** | |
2726 | * ibmvscsis_service_wait_q() - Service Waiting Queue | |
2727 | * @timer: Pointer to timer which has expired | |
2728 | * | |
2729 | * This routine is called when the timer pops to service the waiting | |
2730 | * queue. Elements on the queue have completed, their responses have been | |
2731 | * copied to the client, but the client's response queue was full so | |
2732 | * the queue message could not be sent. The routine grabs the proper locks | |
2733 | * and calls send messages. | |
2734 | * | |
2735 | * EXECUTION ENVIRONMENT: | |
2736 | * called at interrupt level | |
2737 | */ | |
2738 | static enum hrtimer_restart ibmvscsis_service_wait_q(struct hrtimer *timer) | |
2739 | { | |
2740 | struct timer_cb *p_timer = container_of(timer, struct timer_cb, timer); | |
2741 | struct scsi_info *vscsi = container_of(p_timer, struct scsi_info, | |
2742 | rsp_q_timer); | |
2743 | ||
2744 | spin_lock_bh(&vscsi->intr_lock); | |
2745 | p_timer->timer_pops += 1; | |
2746 | p_timer->started = false; | |
2747 | ibmvscsis_send_messages(vscsi); | |
2748 | spin_unlock_bh(&vscsi->intr_lock); | |
2749 | ||
2750 | return HRTIMER_NORESTART; | |
2751 | } | |
2752 | ||
2753 | static long ibmvscsis_alloctimer(struct scsi_info *vscsi) | |
2754 | { | |
2755 | struct timer_cb *p_timer; | |
2756 | ||
2757 | p_timer = &vscsi->rsp_q_timer; | |
2758 | hrtimer_init(&p_timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
2759 | ||
2760 | p_timer->timer.function = ibmvscsis_service_wait_q; | |
2761 | p_timer->started = false; | |
2762 | p_timer->timer_pops = 0; | |
2763 | ||
2764 | return ADAPT_SUCCESS; | |
2765 | } | |
2766 | ||
2767 | static void ibmvscsis_freetimer(struct scsi_info *vscsi) | |
2768 | { | |
2769 | struct timer_cb *p_timer; | |
2770 | ||
2771 | p_timer = &vscsi->rsp_q_timer; | |
2772 | ||
2773 | (void)hrtimer_cancel(&p_timer->timer); | |
2774 | ||
2775 | p_timer->started = false; | |
2776 | p_timer->timer_pops = 0; | |
2777 | } | |
2778 | ||
2779 | static irqreturn_t ibmvscsis_interrupt(int dummy, void *data) | |
2780 | { | |
2781 | struct scsi_info *vscsi = data; | |
2782 | ||
2783 | vio_disable_interrupts(vscsi->dma_dev); | |
2784 | tasklet_schedule(&vscsi->work_task); | |
2785 | ||
2786 | return IRQ_HANDLED; | |
2787 | } | |
2788 | ||
88a678bb BL |
2789 | /** |
2790 | * ibmvscsis_enable_change_state() - Set new state based on enabled status | |
2791 | * @vscsi: Pointer to our adapter structure | |
2792 | * | |
2793 | * This function determines our new state now that we are enabled. This | |
2794 | * may involve sending an Init Complete message to the client. | |
2795 | * | |
2796 | * Must be called with interrupt lock held. | |
2797 | */ | |
2798 | static long ibmvscsis_enable_change_state(struct scsi_info *vscsi) | |
2799 | { | |
c9b3379f | 2800 | int bytes; |
88a678bb BL |
2801 | long rc = ADAPT_SUCCESS; |
2802 | ||
c9b3379f MC |
2803 | bytes = vscsi->cmd_q.size * PAGE_SIZE; |
2804 | rc = h_reg_crq(vscsi->dds.unit_id, vscsi->cmd_q.crq_token, bytes); | |
2805 | if (rc == H_CLOSED || rc == H_SUCCESS) { | |
2806 | vscsi->state = WAIT_CONNECTION; | |
2807 | rc = ibmvscsis_establish_new_q(vscsi); | |
2808 | } | |
88a678bb | 2809 | |
c9b3379f MC |
2810 | if (rc != ADAPT_SUCCESS) { |
2811 | vscsi->state = ERR_DISCONNECTED; | |
2812 | vscsi->flags |= RESPONSE_Q_DOWN; | |
88a678bb BL |
2813 | } |
2814 | ||
2815 | return rc; | |
2816 | } | |
2817 | ||
2818 | /** | |
2819 | * ibmvscsis_create_command_q() - Create Command Queue | |
2820 | * @vscsi: Pointer to our adapter structure | |
2821 | * @num_cmds: Currently unused. In the future, may be used to determine | |
2822 | * the size of the CRQ. | |
2823 | * | |
2824 | * Allocates memory for command queue maps remote memory into an ioba | |
2825 | * initializes the command response queue | |
2826 | * | |
2827 | * EXECUTION ENVIRONMENT: | |
2828 | * Process level only | |
2829 | */ | |
2830 | static long ibmvscsis_create_command_q(struct scsi_info *vscsi, int num_cmds) | |
2831 | { | |
88a678bb BL |
2832 | int pages; |
2833 | struct vio_dev *vdev = vscsi->dma_dev; | |
2834 | ||
2835 | /* We might support multiple pages in the future, but just 1 for now */ | |
2836 | pages = 1; | |
2837 | ||
2838 | vscsi->cmd_q.size = pages; | |
2839 | ||
2840 | vscsi->cmd_q.base_addr = | |
2841 | (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); | |
2842 | if (!vscsi->cmd_q.base_addr) | |
2843 | return -ENOMEM; | |
2844 | ||
2845 | vscsi->cmd_q.mask = ((uint)pages * CRQ_PER_PAGE) - 1; | |
2846 | ||
2847 | vscsi->cmd_q.crq_token = dma_map_single(&vdev->dev, | |
2848 | vscsi->cmd_q.base_addr, | |
2849 | PAGE_SIZE, DMA_BIDIRECTIONAL); | |
2850 | if (dma_mapping_error(&vdev->dev, vscsi->cmd_q.crq_token)) { | |
2851 | free_page((unsigned long)vscsi->cmd_q.base_addr); | |
2852 | return -ENOMEM; | |
2853 | } | |
2854 | ||
c9b3379f | 2855 | return 0; |
88a678bb BL |
2856 | } |
2857 | ||
2858 | /** | |
2859 | * ibmvscsis_destroy_command_q - Destroy Command Queue | |
2860 | * @vscsi: Pointer to our adapter structure | |
2861 | * | |
2862 | * Releases memory for command queue and unmaps mapped remote memory. | |
2863 | * | |
2864 | * EXECUTION ENVIRONMENT: | |
2865 | * Process level only | |
2866 | */ | |
2867 | static void ibmvscsis_destroy_command_q(struct scsi_info *vscsi) | |
2868 | { | |
2869 | dma_unmap_single(&vscsi->dma_dev->dev, vscsi->cmd_q.crq_token, | |
2870 | PAGE_SIZE, DMA_BIDIRECTIONAL); | |
2871 | free_page((unsigned long)vscsi->cmd_q.base_addr); | |
2872 | vscsi->cmd_q.base_addr = NULL; | |
2873 | vscsi->state = NO_QUEUE; | |
2874 | } | |
2875 | ||
2876 | static u8 ibmvscsis_fast_fail(struct scsi_info *vscsi, | |
2877 | struct ibmvscsis_cmd *cmd) | |
2878 | { | |
2879 | struct iu_entry *iue = cmd->iue; | |
2880 | struct se_cmd *se_cmd = &cmd->se_cmd; | |
2881 | struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf; | |
2882 | struct scsi_sense_hdr sshdr; | |
2883 | u8 rc = se_cmd->scsi_status; | |
2884 | ||
2885 | if (vscsi->fast_fail && (READ_CMD(srp->cdb) || WRITE_CMD(srp->cdb))) | |
2886 | if (scsi_normalize_sense(se_cmd->sense_buffer, | |
2887 | se_cmd->scsi_sense_length, &sshdr)) | |
2888 | if (sshdr.sense_key == HARDWARE_ERROR && | |
2889 | (se_cmd->residual_count == 0 || | |
2890 | se_cmd->residual_count == se_cmd->data_length)) { | |
2891 | rc = NO_SENSE; | |
2892 | cmd->flags |= CMD_FAST_FAIL; | |
2893 | } | |
2894 | ||
2895 | return rc; | |
2896 | } | |
2897 | ||
2898 | /** | |
2899 | * srp_build_response() - Build an SRP response buffer | |
2900 | * @vscsi: Pointer to our adapter structure | |
2901 | * @cmd: Pointer to command for which to send the response | |
2902 | * @len_p: Where to return the length of the IU response sent. This | |
2903 | * is needed to construct the CRQ response. | |
2904 | * | |
2905 | * Build the SRP response buffer and copy it to the client's memory space. | |
2906 | */ | |
2907 | static long srp_build_response(struct scsi_info *vscsi, | |
2908 | struct ibmvscsis_cmd *cmd, uint *len_p) | |
2909 | { | |
2910 | struct iu_entry *iue = cmd->iue; | |
2911 | struct se_cmd *se_cmd = &cmd->se_cmd; | |
2912 | struct srp_rsp *rsp; | |
2913 | uint len; | |
2914 | u32 rsp_code; | |
2915 | char *data; | |
2916 | u32 *tsk_status; | |
2917 | long rc = ADAPT_SUCCESS; | |
2918 | ||
2919 | spin_lock_bh(&vscsi->intr_lock); | |
2920 | ||
2921 | rsp = &vio_iu(iue)->srp.rsp; | |
2922 | len = sizeof(*rsp); | |
2923 | memset(rsp, 0, len); | |
2924 | data = rsp->data; | |
2925 | ||
2926 | rsp->opcode = SRP_RSP; | |
2927 | ||
2928 | if (vscsi->credit > 0 && vscsi->state == SRP_PROCESSING) | |
2929 | rsp->req_lim_delta = cpu_to_be32(vscsi->credit); | |
2930 | else | |
2931 | rsp->req_lim_delta = cpu_to_be32(1 + vscsi->credit); | |
2932 | rsp->tag = cmd->rsp.tag; | |
2933 | rsp->flags = 0; | |
2934 | ||
2935 | if (cmd->type == SCSI_CDB) { | |
2936 | rsp->status = ibmvscsis_fast_fail(vscsi, cmd); | |
2937 | if (rsp->status) { | |
2938 | pr_debug("build_resp: cmd %p, scsi status %d\n", cmd, | |
2939 | (int)rsp->status); | |
2940 | ibmvscsis_determine_resid(se_cmd, rsp); | |
2941 | if (se_cmd->scsi_sense_length && se_cmd->sense_buffer) { | |
2942 | rsp->sense_data_len = | |
2943 | cpu_to_be32(se_cmd->scsi_sense_length); | |
2944 | rsp->flags |= SRP_RSP_FLAG_SNSVALID; | |
2945 | len += se_cmd->scsi_sense_length; | |
2946 | memcpy(data, se_cmd->sense_buffer, | |
2947 | se_cmd->scsi_sense_length); | |
2948 | } | |
2949 | rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> | |
2950 | UCSOLNT_RESP_SHIFT; | |
2951 | } else if (cmd->flags & CMD_FAST_FAIL) { | |
2952 | pr_debug("build_resp: cmd %p, fast fail\n", cmd); | |
2953 | rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> | |
2954 | UCSOLNT_RESP_SHIFT; | |
2955 | } else { | |
2956 | rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >> | |
2957 | SCSOLNT_RESP_SHIFT; | |
2958 | } | |
2959 | } else { | |
2960 | /* this is task management */ | |
2961 | rsp->status = 0; | |
2962 | rsp->resp_data_len = cpu_to_be32(4); | |
2963 | rsp->flags |= SRP_RSP_FLAG_RSPVALID; | |
2964 | ||
2965 | switch (se_cmd->se_tmr_req->response) { | |
2966 | case TMR_FUNCTION_COMPLETE: | |
2967 | case TMR_TASK_DOES_NOT_EXIST: | |
2968 | rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_COMPLETE; | |
2969 | rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >> | |
2970 | SCSOLNT_RESP_SHIFT; | |
2971 | break; | |
2972 | case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: | |
2973 | case TMR_LUN_DOES_NOT_EXIST: | |
2974 | rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_NOT_SUPPORTED; | |
2975 | rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> | |
2976 | UCSOLNT_RESP_SHIFT; | |
2977 | break; | |
2978 | case TMR_FUNCTION_FAILED: | |
2979 | case TMR_FUNCTION_REJECTED: | |
2980 | default: | |
2981 | rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_FAILED; | |
2982 | rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> | |
2983 | UCSOLNT_RESP_SHIFT; | |
2984 | break; | |
2985 | } | |
2986 | ||
2987 | tsk_status = (u32 *)data; | |
2988 | *tsk_status = cpu_to_be32(rsp_code); | |
2989 | data = (char *)(tsk_status + 1); | |
2990 | len += 4; | |
2991 | } | |
2992 | ||
2993 | dma_wmb(); | |
2994 | rc = h_copy_rdma(len, vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma, | |
2995 | vscsi->dds.window[REMOTE].liobn, | |
2996 | be64_to_cpu(iue->remote_token)); | |
2997 | ||
2998 | switch (rc) { | |
2999 | case H_SUCCESS: | |
3000 | vscsi->credit = 0; | |
3001 | *len_p = len; | |
3002 | break; | |
3003 | case H_PERMISSION: | |
3004 | if (connection_broken(vscsi)) | |
3005 | vscsi->flags |= RESPONSE_Q_DOWN | CLIENT_FAILED; | |
3006 | ||
3007 | dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld, flags 0x%x, state 0x%hx\n", | |
3008 | rc, vscsi->flags, vscsi->state); | |
3009 | break; | |
3010 | case H_SOURCE_PARM: | |
3011 | case H_DEST_PARM: | |
3012 | default: | |
3013 | dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld\n", | |
3014 | rc); | |
3015 | break; | |
3016 | } | |
3017 | ||
3018 | spin_unlock_bh(&vscsi->intr_lock); | |
3019 | ||
3020 | return rc; | |
3021 | } | |
3022 | ||
3023 | static int ibmvscsis_rdma(struct ibmvscsis_cmd *cmd, struct scatterlist *sg, | |
3024 | int nsg, struct srp_direct_buf *md, int nmd, | |
3025 | enum dma_data_direction dir, unsigned int bytes) | |
3026 | { | |
3027 | struct iu_entry *iue = cmd->iue; | |
3028 | struct srp_target *target = iue->target; | |
3029 | struct scsi_info *vscsi = target->ldata; | |
3030 | struct scatterlist *sgp; | |
3031 | dma_addr_t client_ioba, server_ioba; | |
3032 | ulong buf_len; | |
3033 | ulong client_len, server_len; | |
3034 | int md_idx; | |
3035 | long tx_len; | |
3036 | long rc = 0; | |
3037 | ||
88a678bb BL |
3038 | if (bytes == 0) |
3039 | return 0; | |
3040 | ||
3041 | sgp = sg; | |
3042 | client_len = 0; | |
3043 | server_len = 0; | |
3044 | md_idx = 0; | |
3045 | tx_len = bytes; | |
3046 | ||
3047 | do { | |
3048 | if (client_len == 0) { | |
3049 | if (md_idx >= nmd) { | |
3050 | dev_err(&vscsi->dev, "rdma: ran out of client memory descriptors\n"); | |
3051 | rc = -EIO; | |
3052 | break; | |
3053 | } | |
3054 | client_ioba = be64_to_cpu(md[md_idx].va); | |
3055 | client_len = be32_to_cpu(md[md_idx].len); | |
3056 | } | |
3057 | if (server_len == 0) { | |
3058 | if (!sgp) { | |
3059 | dev_err(&vscsi->dev, "rdma: ran out of scatter/gather list\n"); | |
3060 | rc = -EIO; | |
3061 | break; | |
3062 | } | |
3063 | server_ioba = sg_dma_address(sgp); | |
3064 | server_len = sg_dma_len(sgp); | |
3065 | } | |
3066 | ||
3067 | buf_len = tx_len; | |
3068 | ||
3069 | if (buf_len > client_len) | |
3070 | buf_len = client_len; | |
3071 | ||
3072 | if (buf_len > server_len) | |
3073 | buf_len = server_len; | |
3074 | ||
3075 | if (buf_len > max_vdma_size) | |
3076 | buf_len = max_vdma_size; | |
3077 | ||
3078 | if (dir == DMA_TO_DEVICE) { | |
3079 | /* read from client */ | |
3080 | rc = h_copy_rdma(buf_len, | |
3081 | vscsi->dds.window[REMOTE].liobn, | |
3082 | client_ioba, | |
3083 | vscsi->dds.window[LOCAL].liobn, | |
3084 | server_ioba); | |
3085 | } else { | |
88a678bb BL |
3086 | /* The h_copy_rdma will cause phyp, running in another |
3087 | * partition, to read memory, so we need to make sure | |
3088 | * the data has been written out, hence these syncs. | |
3089 | */ | |
3090 | /* ensure that everything is in memory */ | |
3091 | isync(); | |
3092 | /* ensure that memory has been made visible */ | |
3093 | dma_wmb(); | |
3094 | rc = h_copy_rdma(buf_len, | |
3095 | vscsi->dds.window[LOCAL].liobn, | |
3096 | server_ioba, | |
3097 | vscsi->dds.window[REMOTE].liobn, | |
3098 | client_ioba); | |
3099 | } | |
3100 | switch (rc) { | |
3101 | case H_SUCCESS: | |
3102 | break; | |
3103 | case H_PERMISSION: | |
3104 | case H_SOURCE_PARM: | |
3105 | case H_DEST_PARM: | |
3106 | if (connection_broken(vscsi)) { | |
3107 | spin_lock_bh(&vscsi->intr_lock); | |
3108 | vscsi->flags |= | |
3109 | (RESPONSE_Q_DOWN | CLIENT_FAILED); | |
3110 | spin_unlock_bh(&vscsi->intr_lock); | |
3111 | } | |
3112 | dev_err(&vscsi->dev, "rdma: h_copy_rdma failed, rc %ld\n", | |
3113 | rc); | |
3114 | break; | |
3115 | ||
3116 | default: | |
3117 | dev_err(&vscsi->dev, "rdma: unknown error %ld from h_copy_rdma\n", | |
3118 | rc); | |
3119 | break; | |
3120 | } | |
3121 | ||
3122 | if (!rc) { | |
3123 | tx_len -= buf_len; | |
3124 | if (tx_len) { | |
3125 | client_len -= buf_len; | |
3126 | if (client_len == 0) | |
3127 | md_idx++; | |
3128 | else | |
3129 | client_ioba += buf_len; | |
3130 | ||
3131 | server_len -= buf_len; | |
3132 | if (server_len == 0) | |
3133 | sgp = sg_next(sgp); | |
3134 | else | |
3135 | server_ioba += buf_len; | |
3136 | } else { | |
3137 | break; | |
3138 | } | |
3139 | } | |
3140 | } while (!rc); | |
3141 | ||
3142 | return rc; | |
3143 | } | |
3144 | ||
3145 | /** | |
3146 | * ibmvscsis_handle_crq() - Handle CRQ | |
3147 | * @data: Pointer to our adapter structure | |
3148 | * | |
3149 | * Read the command elements from the command queue and copy the payloads | |
3150 | * associated with the command elements to local memory and execute the | |
3151 | * SRP requests. | |
3152 | * | |
3153 | * Note: this is an edge triggered interrupt. It can not be shared. | |
3154 | */ | |
3155 | static void ibmvscsis_handle_crq(unsigned long data) | |
3156 | { | |
3157 | struct scsi_info *vscsi = (struct scsi_info *)data; | |
3158 | struct viosrp_crq *crq; | |
3159 | long rc; | |
3160 | bool ack = true; | |
3161 | volatile u8 valid; | |
3162 | ||
3163 | spin_lock_bh(&vscsi->intr_lock); | |
3164 | ||
3165 | pr_debug("got interrupt\n"); | |
3166 | ||
3167 | /* | |
3168 | * if we are in a path where we are waiting for all pending commands | |
3169 | * to complete because we received a transport event and anything in | |
79fac9c9 | 3170 | * the command queue is for a new connection, do nothing |
88a678bb BL |
3171 | */ |
3172 | if (TARGET_STOP(vscsi)) { | |
3173 | vio_enable_interrupts(vscsi->dma_dev); | |
3174 | ||
3175 | pr_debug("handle_crq, don't process: flags 0x%x, state 0x%hx\n", | |
3176 | vscsi->flags, vscsi->state); | |
3177 | spin_unlock_bh(&vscsi->intr_lock); | |
3178 | return; | |
3179 | } | |
3180 | ||
3181 | rc = vscsi->flags & SCHEDULE_DISCONNECT; | |
3182 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
3183 | valid = crq->valid; | |
3184 | dma_rmb(); | |
3185 | ||
3186 | while (valid) { | |
3187 | /* | |
3188 | * These are edege triggered interrupts. After dropping out of | |
3189 | * the while loop, the code must check for work since an | |
3190 | * interrupt could be lost, and an elment be left on the queue, | |
3191 | * hence the label. | |
3192 | */ | |
3193 | cmd_work: | |
3194 | vscsi->cmd_q.index = | |
3195 | (vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask; | |
3196 | ||
3197 | if (!rc) { | |
3198 | rc = ibmvscsis_parse_command(vscsi, crq); | |
3199 | } else { | |
3200 | if ((uint)crq->valid == VALID_TRANS_EVENT) { | |
3201 | /* | |
3202 | * must service the transport layer events even | |
3203 | * in an error state, dont break out until all | |
3204 | * the consecutive transport events have been | |
3205 | * processed | |
3206 | */ | |
3207 | rc = ibmvscsis_trans_event(vscsi, crq); | |
3208 | } else if (vscsi->flags & TRANS_EVENT) { | |
3209 | /* | |
81290215 | 3210 | * if a transport event has occurred leave |
88a678bb | 3211 | * everything but transport events on the queue |
81290215 | 3212 | * |
88a678bb | 3213 | * need to decrement the queue index so we can |
79fac9c9 | 3214 | * look at the element again |
88a678bb BL |
3215 | */ |
3216 | if (vscsi->cmd_q.index) | |
3217 | vscsi->cmd_q.index -= 1; | |
3218 | else | |
3219 | /* | |
3220 | * index is at 0 it just wrapped. | |
3221 | * have it index last element in q | |
3222 | */ | |
3223 | vscsi->cmd_q.index = vscsi->cmd_q.mask; | |
3224 | break; | |
3225 | } | |
3226 | } | |
3227 | ||
3228 | crq->valid = INVALIDATE_CMD_RESP_EL; | |
3229 | ||
3230 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
3231 | valid = crq->valid; | |
3232 | dma_rmb(); | |
3233 | } | |
3234 | ||
3235 | if (!rc) { | |
3236 | if (ack) { | |
3237 | vio_enable_interrupts(vscsi->dma_dev); | |
3238 | ack = false; | |
3239 | pr_debug("handle_crq, reenabling interrupts\n"); | |
3240 | } | |
3241 | valid = crq->valid; | |
3242 | dma_rmb(); | |
3243 | if (valid) | |
3244 | goto cmd_work; | |
3245 | } else { | |
3246 | pr_debug("handle_crq, error: flags 0x%x, state 0x%hx, crq index 0x%x\n", | |
3247 | vscsi->flags, vscsi->state, vscsi->cmd_q.index); | |
3248 | } | |
3249 | ||
3250 | pr_debug("Leaving handle_crq: schedule_q empty %d, flags 0x%x, state 0x%hx\n", | |
3251 | (int)list_empty(&vscsi->schedule_q), vscsi->flags, | |
3252 | vscsi->state); | |
3253 | ||
3254 | spin_unlock_bh(&vscsi->intr_lock); | |
3255 | } | |
3256 | ||
3257 | static int ibmvscsis_probe(struct vio_dev *vdev, | |
3258 | const struct vio_device_id *id) | |
3259 | { | |
3260 | struct scsi_info *vscsi; | |
3261 | int rc = 0; | |
3262 | long hrc = 0; | |
3263 | char wq_name[24]; | |
3264 | ||
3265 | vscsi = kzalloc(sizeof(*vscsi), GFP_KERNEL); | |
3266 | if (!vscsi) { | |
3267 | rc = -ENOMEM; | |
3268 | pr_err("probe: allocation of adapter failed\n"); | |
3269 | return rc; | |
3270 | } | |
3271 | ||
3272 | vscsi->dma_dev = vdev; | |
3273 | vscsi->dev = vdev->dev; | |
3274 | INIT_LIST_HEAD(&vscsi->schedule_q); | |
3275 | INIT_LIST_HEAD(&vscsi->waiting_rsp); | |
3276 | INIT_LIST_HEAD(&vscsi->active_q); | |
3277 | ||
11950d70 MC |
3278 | snprintf(vscsi->tport.tport_name, IBMVSCSIS_NAMELEN, "%s", |
3279 | dev_name(&vdev->dev)); | |
88a678bb BL |
3280 | |
3281 | pr_debug("probe tport_name: %s\n", vscsi->tport.tport_name); | |
3282 | ||
3283 | rc = read_dma_window(vscsi); | |
3284 | if (rc) | |
3285 | goto free_adapter; | |
3286 | pr_debug("Probe: liobn 0x%x, riobn 0x%x\n", | |
3287 | vscsi->dds.window[LOCAL].liobn, | |
3288 | vscsi->dds.window[REMOTE].liobn); | |
3289 | ||
3290 | strcpy(vscsi->eye, "VSCSI "); | |
3291 | strncat(vscsi->eye, vdev->name, MAX_EYE); | |
3292 | ||
3293 | vscsi->dds.unit_id = vdev->unit_address; | |
9c93cf03 MC |
3294 | strncpy(vscsi->dds.partition_name, partition_name, |
3295 | sizeof(vscsi->dds.partition_name)); | |
3296 | vscsi->dds.partition_num = partition_number; | |
88a678bb BL |
3297 | |
3298 | spin_lock_bh(&ibmvscsis_dev_lock); | |
3299 | list_add_tail(&vscsi->list, &ibmvscsis_dev_list); | |
3300 | spin_unlock_bh(&ibmvscsis_dev_lock); | |
3301 | ||
3302 | /* | |
3303 | * TBD: How do we determine # of cmds to request? Do we know how | |
3304 | * many "children" we have? | |
3305 | */ | |
3306 | vscsi->request_limit = INITIAL_SRP_LIMIT; | |
3307 | rc = srp_target_alloc(&vscsi->target, &vdev->dev, vscsi->request_limit, | |
3308 | SRP_MAX_IU_LEN); | |
3309 | if (rc) | |
3310 | goto rem_list; | |
3311 | ||
3312 | vscsi->target.ldata = vscsi; | |
3313 | ||
3314 | rc = ibmvscsis_alloc_cmds(vscsi, vscsi->request_limit); | |
3315 | if (rc) { | |
3316 | dev_err(&vscsi->dev, "alloc_cmds failed, rc %d, num %d\n", | |
3317 | rc, vscsi->request_limit); | |
3318 | goto free_target; | |
3319 | } | |
3320 | ||
3321 | /* | |
3322 | * Note: the lock is used in freeing timers, so must initialize | |
3323 | * first so that ordering in case of error is correct. | |
3324 | */ | |
3325 | spin_lock_init(&vscsi->intr_lock); | |
3326 | ||
3327 | rc = ibmvscsis_alloctimer(vscsi); | |
3328 | if (rc) { | |
3329 | dev_err(&vscsi->dev, "probe: alloctimer failed, rc %d\n", rc); | |
3330 | goto free_cmds; | |
3331 | } | |
3332 | ||
3333 | rc = ibmvscsis_create_command_q(vscsi, 256); | |
3334 | if (rc) { | |
3335 | dev_err(&vscsi->dev, "probe: create_command_q failed, rc %d\n", | |
3336 | rc); | |
3337 | goto free_timer; | |
3338 | } | |
3339 | ||
3340 | vscsi->map_buf = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
3341 | if (!vscsi->map_buf) { | |
3342 | rc = -ENOMEM; | |
3343 | dev_err(&vscsi->dev, "probe: allocating cmd buffer failed\n"); | |
3344 | goto destroy_queue; | |
3345 | } | |
3346 | ||
3347 | vscsi->map_ioba = dma_map_single(&vdev->dev, vscsi->map_buf, PAGE_SIZE, | |
3348 | DMA_BIDIRECTIONAL); | |
3349 | if (dma_mapping_error(&vdev->dev, vscsi->map_ioba)) { | |
38247feb | 3350 | rc = -ENOMEM; |
88a678bb BL |
3351 | dev_err(&vscsi->dev, "probe: error mapping command buffer\n"); |
3352 | goto free_buf; | |
3353 | } | |
3354 | ||
3355 | hrc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO, | |
3356 | (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0, | |
3357 | 0); | |
3358 | if (hrc == H_SUCCESS) | |
3359 | vscsi->client_data.partition_number = | |
3360 | be64_to_cpu(*(u64 *)vscsi->map_buf); | |
3361 | /* | |
3362 | * We expect the VIOCTL to fail if we're configured as "any | |
3363 | * client can connect" and the client isn't activated yet. | |
3364 | * We'll make the call again when he sends an init msg. | |
3365 | */ | |
3366 | pr_debug("probe hrc %ld, client partition num %d\n", | |
3367 | hrc, vscsi->client_data.partition_number); | |
3368 | ||
3369 | tasklet_init(&vscsi->work_task, ibmvscsis_handle_crq, | |
3370 | (unsigned long)vscsi); | |
3371 | ||
3372 | init_completion(&vscsi->wait_idle); | |
8bf11557 | 3373 | init_completion(&vscsi->unconfig); |
88a678bb BL |
3374 | |
3375 | snprintf(wq_name, 24, "ibmvscsis%s", dev_name(&vdev->dev)); | |
3376 | vscsi->work_q = create_workqueue(wq_name); | |
3377 | if (!vscsi->work_q) { | |
3378 | rc = -ENOMEM; | |
3379 | dev_err(&vscsi->dev, "create_workqueue failed\n"); | |
3380 | goto unmap_buf; | |
3381 | } | |
3382 | ||
3383 | rc = request_irq(vdev->irq, ibmvscsis_interrupt, 0, "ibmvscsis", vscsi); | |
3384 | if (rc) { | |
3385 | rc = -EPERM; | |
3386 | dev_err(&vscsi->dev, "probe: request_irq failed, rc %d\n", rc); | |
3387 | goto destroy_WQ; | |
3388 | } | |
3389 | ||
c9b3379f | 3390 | vscsi->state = WAIT_ENABLED; |
88a678bb BL |
3391 | |
3392 | dev_set_drvdata(&vdev->dev, vscsi); | |
3393 | ||
3394 | return 0; | |
3395 | ||
88a678bb BL |
3396 | destroy_WQ: |
3397 | destroy_workqueue(vscsi->work_q); | |
3398 | unmap_buf: | |
3399 | dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE, | |
3400 | DMA_BIDIRECTIONAL); | |
3401 | free_buf: | |
3402 | kfree(vscsi->map_buf); | |
3403 | destroy_queue: | |
3404 | tasklet_kill(&vscsi->work_task); | |
3405 | ibmvscsis_unregister_command_q(vscsi); | |
3406 | ibmvscsis_destroy_command_q(vscsi); | |
3407 | free_timer: | |
3408 | ibmvscsis_freetimer(vscsi); | |
3409 | free_cmds: | |
3410 | ibmvscsis_free_cmds(vscsi); | |
3411 | free_target: | |
3412 | srp_target_free(&vscsi->target); | |
3413 | rem_list: | |
3414 | spin_lock_bh(&ibmvscsis_dev_lock); | |
3415 | list_del(&vscsi->list); | |
3416 | spin_unlock_bh(&ibmvscsis_dev_lock); | |
3417 | free_adapter: | |
3418 | kfree(vscsi); | |
3419 | ||
3420 | return rc; | |
3421 | } | |
3422 | ||
3423 | static int ibmvscsis_remove(struct vio_dev *vdev) | |
3424 | { | |
3425 | struct scsi_info *vscsi = dev_get_drvdata(&vdev->dev); | |
3426 | ||
3427 | pr_debug("remove (%s)\n", dev_name(&vscsi->dma_dev->dev)); | |
3428 | ||
8bf11557 MC |
3429 | spin_lock_bh(&vscsi->intr_lock); |
3430 | ibmvscsis_post_disconnect(vscsi, UNCONFIGURING, 0); | |
3431 | vscsi->flags |= CFG_SLEEPING; | |
3432 | spin_unlock_bh(&vscsi->intr_lock); | |
3433 | wait_for_completion(&vscsi->unconfig); | |
88a678bb BL |
3434 | |
3435 | vio_disable_interrupts(vdev); | |
3436 | free_irq(vdev->irq, vscsi); | |
3437 | destroy_workqueue(vscsi->work_q); | |
3438 | dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE, | |
3439 | DMA_BIDIRECTIONAL); | |
3440 | kfree(vscsi->map_buf); | |
3441 | tasklet_kill(&vscsi->work_task); | |
88a678bb BL |
3442 | ibmvscsis_destroy_command_q(vscsi); |
3443 | ibmvscsis_freetimer(vscsi); | |
3444 | ibmvscsis_free_cmds(vscsi); | |
3445 | srp_target_free(&vscsi->target); | |
3446 | spin_lock_bh(&ibmvscsis_dev_lock); | |
3447 | list_del(&vscsi->list); | |
3448 | spin_unlock_bh(&ibmvscsis_dev_lock); | |
3449 | kfree(vscsi); | |
3450 | ||
3451 | return 0; | |
3452 | } | |
3453 | ||
3454 | static ssize_t system_id_show(struct device *dev, | |
3455 | struct device_attribute *attr, char *buf) | |
3456 | { | |
3457 | return snprintf(buf, PAGE_SIZE, "%s\n", system_id); | |
3458 | } | |
3459 | ||
3460 | static ssize_t partition_number_show(struct device *dev, | |
3461 | struct device_attribute *attr, char *buf) | |
3462 | { | |
3463 | return snprintf(buf, PAGE_SIZE, "%x\n", partition_number); | |
3464 | } | |
3465 | ||
3466 | static ssize_t unit_address_show(struct device *dev, | |
3467 | struct device_attribute *attr, char *buf) | |
3468 | { | |
3469 | struct scsi_info *vscsi = container_of(dev, struct scsi_info, dev); | |
3470 | ||
3471 | return snprintf(buf, PAGE_SIZE, "%x\n", vscsi->dma_dev->unit_address); | |
3472 | } | |
3473 | ||
3474 | static int ibmvscsis_get_system_info(void) | |
3475 | { | |
3476 | struct device_node *rootdn, *vdevdn; | |
3477 | const char *id, *model, *name; | |
3478 | const uint *num; | |
3479 | ||
3480 | rootdn = of_find_node_by_path("/"); | |
3481 | if (!rootdn) | |
3482 | return -ENOENT; | |
3483 | ||
3484 | model = of_get_property(rootdn, "model", NULL); | |
3485 | id = of_get_property(rootdn, "system-id", NULL); | |
3486 | if (model && id) | |
3487 | snprintf(system_id, sizeof(system_id), "%s-%s", model, id); | |
3488 | ||
3489 | name = of_get_property(rootdn, "ibm,partition-name", NULL); | |
3490 | if (name) | |
3491 | strncpy(partition_name, name, sizeof(partition_name)); | |
3492 | ||
3493 | num = of_get_property(rootdn, "ibm,partition-no", NULL); | |
3494 | if (num) | |
9c93cf03 | 3495 | partition_number = of_read_number(num, 1); |
88a678bb BL |
3496 | |
3497 | of_node_put(rootdn); | |
3498 | ||
3499 | vdevdn = of_find_node_by_path("/vdevice"); | |
3500 | if (vdevdn) { | |
3501 | const uint *mvds; | |
3502 | ||
3503 | mvds = of_get_property(vdevdn, "ibm,max-virtual-dma-size", | |
3504 | NULL); | |
3505 | if (mvds) | |
3506 | max_vdma_size = *mvds; | |
3507 | of_node_put(vdevdn); | |
3508 | } | |
3509 | ||
3510 | return 0; | |
3511 | } | |
3512 | ||
3513 | static char *ibmvscsis_get_fabric_name(void) | |
3514 | { | |
3515 | return "ibmvscsis"; | |
3516 | } | |
3517 | ||
3518 | static char *ibmvscsis_get_fabric_wwn(struct se_portal_group *se_tpg) | |
3519 | { | |
3520 | struct ibmvscsis_tport *tport = | |
3521 | container_of(se_tpg, struct ibmvscsis_tport, se_tpg); | |
3522 | ||
3523 | return tport->tport_name; | |
3524 | } | |
3525 | ||
3526 | static u16 ibmvscsis_get_tag(struct se_portal_group *se_tpg) | |
3527 | { | |
3528 | struct ibmvscsis_tport *tport = | |
3529 | container_of(se_tpg, struct ibmvscsis_tport, se_tpg); | |
3530 | ||
3531 | return tport->tport_tpgt; | |
3532 | } | |
3533 | ||
3534 | static u32 ibmvscsis_get_default_depth(struct se_portal_group *se_tpg) | |
3535 | { | |
3536 | return 1; | |
3537 | } | |
3538 | ||
3539 | static int ibmvscsis_check_true(struct se_portal_group *se_tpg) | |
3540 | { | |
3541 | return 1; | |
3542 | } | |
3543 | ||
3544 | static int ibmvscsis_check_false(struct se_portal_group *se_tpg) | |
3545 | { | |
3546 | return 0; | |
3547 | } | |
3548 | ||
3549 | static u32 ibmvscsis_tpg_get_inst_index(struct se_portal_group *se_tpg) | |
3550 | { | |
3551 | return 1; | |
3552 | } | |
3553 | ||
3554 | static int ibmvscsis_check_stop_free(struct se_cmd *se_cmd) | |
3555 | { | |
3556 | return target_put_sess_cmd(se_cmd); | |
3557 | } | |
3558 | ||
3559 | static void ibmvscsis_release_cmd(struct se_cmd *se_cmd) | |
3560 | { | |
3561 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3562 | se_cmd); | |
3563 | struct scsi_info *vscsi = cmd->adapter; | |
3564 | ||
88a678bb BL |
3565 | spin_lock_bh(&vscsi->intr_lock); |
3566 | /* Remove from active_q */ | |
980b3271 | 3567 | list_move_tail(&cmd->list, &vscsi->waiting_rsp); |
88a678bb BL |
3568 | ibmvscsis_send_messages(vscsi); |
3569 | spin_unlock_bh(&vscsi->intr_lock); | |
3570 | } | |
3571 | ||
3572 | static u32 ibmvscsis_sess_get_index(struct se_session *se_sess) | |
3573 | { | |
3574 | return 0; | |
3575 | } | |
3576 | ||
3577 | static int ibmvscsis_write_pending(struct se_cmd *se_cmd) | |
3578 | { | |
3579 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3580 | se_cmd); | |
3581 | struct iu_entry *iue = cmd->iue; | |
3582 | int rc; | |
3583 | ||
88a678bb BL |
3584 | rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma, |
3585 | 1, 1); | |
3586 | if (rc) { | |
3587 | pr_err("srp_transfer_data() failed: %d\n", rc); | |
3588 | return -EAGAIN; | |
3589 | } | |
3590 | /* | |
3591 | * We now tell TCM to add this WRITE CDB directly into the TCM storage | |
3592 | * object execution queue. | |
3593 | */ | |
3594 | target_execute_cmd(se_cmd); | |
3595 | return 0; | |
3596 | } | |
3597 | ||
3598 | static int ibmvscsis_write_pending_status(struct se_cmd *se_cmd) | |
3599 | { | |
3600 | return 0; | |
3601 | } | |
3602 | ||
3603 | static void ibmvscsis_set_default_node_attrs(struct se_node_acl *nacl) | |
3604 | { | |
3605 | } | |
3606 | ||
3607 | static int ibmvscsis_get_cmd_state(struct se_cmd *se_cmd) | |
3608 | { | |
3609 | return 0; | |
3610 | } | |
3611 | ||
3612 | static int ibmvscsis_queue_data_in(struct se_cmd *se_cmd) | |
3613 | { | |
3614 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3615 | se_cmd); | |
3616 | struct iu_entry *iue = cmd->iue; | |
3617 | struct scsi_info *vscsi = cmd->adapter; | |
3618 | char *sd; | |
3619 | uint len = 0; | |
3620 | int rc; | |
3621 | ||
88a678bb BL |
3622 | rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma, 1, |
3623 | 1); | |
3624 | if (rc) { | |
3625 | pr_err("srp_transfer_data failed: %d\n", rc); | |
3626 | sd = se_cmd->sense_buffer; | |
3627 | se_cmd->scsi_sense_length = 18; | |
3628 | memset(se_cmd->sense_buffer, 0, se_cmd->scsi_sense_length); | |
3629 | /* Logical Unit Communication Time-out asc/ascq = 0x0801 */ | |
3630 | scsi_build_sense_buffer(0, se_cmd->sense_buffer, MEDIUM_ERROR, | |
3631 | 0x08, 0x01); | |
3632 | } | |
3633 | ||
3634 | srp_build_response(vscsi, cmd, &len); | |
3635 | cmd->rsp.format = SRP_FORMAT; | |
3636 | cmd->rsp.len = len; | |
3637 | ||
3638 | return 0; | |
3639 | } | |
3640 | ||
3641 | static int ibmvscsis_queue_status(struct se_cmd *se_cmd) | |
3642 | { | |
3643 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3644 | se_cmd); | |
3645 | struct scsi_info *vscsi = cmd->adapter; | |
3646 | uint len; | |
3647 | ||
3648 | pr_debug("queue_status %p\n", se_cmd); | |
3649 | ||
3650 | srp_build_response(vscsi, cmd, &len); | |
3651 | cmd->rsp.format = SRP_FORMAT; | |
3652 | cmd->rsp.len = len; | |
3653 | ||
3654 | return 0; | |
3655 | } | |
3656 | ||
3657 | static void ibmvscsis_queue_tm_rsp(struct se_cmd *se_cmd) | |
3658 | { | |
3659 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3660 | se_cmd); | |
3661 | struct scsi_info *vscsi = cmd->adapter; | |
3662 | uint len; | |
3663 | ||
3664 | pr_debug("queue_tm_rsp %p, status %d\n", | |
3665 | se_cmd, (int)se_cmd->se_tmr_req->response); | |
3666 | ||
3667 | srp_build_response(vscsi, cmd, &len); | |
3668 | cmd->rsp.format = SRP_FORMAT; | |
3669 | cmd->rsp.len = len; | |
3670 | } | |
3671 | ||
3672 | static void ibmvscsis_aborted_task(struct se_cmd *se_cmd) | |
3673 | { | |
3674 | /* TBD: What (if anything) should we do here? */ | |
3675 | pr_debug("ibmvscsis_aborted_task %p\n", se_cmd); | |
3676 | } | |
3677 | ||
3678 | static struct se_wwn *ibmvscsis_make_tport(struct target_fabric_configfs *tf, | |
3679 | struct config_group *group, | |
3680 | const char *name) | |
3681 | { | |
3682 | struct ibmvscsis_tport *tport; | |
3683 | ||
3684 | tport = ibmvscsis_lookup_port(name); | |
3685 | if (tport) { | |
3686 | tport->tport_proto_id = SCSI_PROTOCOL_SRP; | |
3687 | pr_debug("make_tport(%s), pointer:%p, tport_id:%x\n", | |
3688 | name, tport, tport->tport_proto_id); | |
3689 | return &tport->tport_wwn; | |
3690 | } | |
3691 | ||
3692 | return ERR_PTR(-EINVAL); | |
3693 | } | |
3694 | ||
3695 | static void ibmvscsis_drop_tport(struct se_wwn *wwn) | |
3696 | { | |
3697 | struct ibmvscsis_tport *tport = container_of(wwn, | |
3698 | struct ibmvscsis_tport, | |
3699 | tport_wwn); | |
3700 | ||
3701 | pr_debug("drop_tport(%s)\n", | |
3702 | config_item_name(&tport->tport_wwn.wwn_group.cg_item)); | |
3703 | } | |
3704 | ||
3705 | static struct se_portal_group *ibmvscsis_make_tpg(struct se_wwn *wwn, | |
3706 | struct config_group *group, | |
3707 | const char *name) | |
3708 | { | |
3709 | struct ibmvscsis_tport *tport = | |
3710 | container_of(wwn, struct ibmvscsis_tport, tport_wwn); | |
3711 | int rc; | |
3712 | ||
3713 | tport->releasing = false; | |
3714 | ||
3715 | rc = core_tpg_register(&tport->tport_wwn, &tport->se_tpg, | |
3716 | tport->tport_proto_id); | |
3717 | if (rc) | |
3718 | return ERR_PTR(rc); | |
3719 | ||
3720 | return &tport->se_tpg; | |
3721 | } | |
3722 | ||
3723 | static void ibmvscsis_drop_tpg(struct se_portal_group *se_tpg) | |
3724 | { | |
3725 | struct ibmvscsis_tport *tport = container_of(se_tpg, | |
3726 | struct ibmvscsis_tport, | |
3727 | se_tpg); | |
3728 | ||
3729 | tport->releasing = true; | |
3730 | tport->enabled = false; | |
3731 | ||
3732 | /* | |
3733 | * Release the virtual I_T Nexus for this ibmvscsis TPG | |
3734 | */ | |
3735 | ibmvscsis_drop_nexus(tport); | |
3736 | /* | |
3737 | * Deregister the se_tpg from TCM.. | |
3738 | */ | |
3739 | core_tpg_deregister(se_tpg); | |
3740 | } | |
3741 | ||
3742 | static ssize_t ibmvscsis_wwn_version_show(struct config_item *item, | |
3743 | char *page) | |
3744 | { | |
3745 | return scnprintf(page, PAGE_SIZE, "%s\n", IBMVSCSIS_VERSION); | |
3746 | } | |
3747 | CONFIGFS_ATTR_RO(ibmvscsis_wwn_, version); | |
3748 | ||
3749 | static struct configfs_attribute *ibmvscsis_wwn_attrs[] = { | |
3750 | &ibmvscsis_wwn_attr_version, | |
3751 | NULL, | |
3752 | }; | |
3753 | ||
3754 | static ssize_t ibmvscsis_tpg_enable_show(struct config_item *item, | |
3755 | char *page) | |
3756 | { | |
3757 | struct se_portal_group *se_tpg = to_tpg(item); | |
3758 | struct ibmvscsis_tport *tport = container_of(se_tpg, | |
3759 | struct ibmvscsis_tport, | |
3760 | se_tpg); | |
3761 | ||
3762 | return snprintf(page, PAGE_SIZE, "%d\n", (tport->enabled) ? 1 : 0); | |
3763 | } | |
3764 | ||
3765 | static ssize_t ibmvscsis_tpg_enable_store(struct config_item *item, | |
3766 | const char *page, size_t count) | |
3767 | { | |
3768 | struct se_portal_group *se_tpg = to_tpg(item); | |
3769 | struct ibmvscsis_tport *tport = container_of(se_tpg, | |
3770 | struct ibmvscsis_tport, | |
3771 | se_tpg); | |
3772 | struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport); | |
3773 | unsigned long tmp; | |
3774 | int rc; | |
3775 | long lrc; | |
3776 | ||
3777 | rc = kstrtoul(page, 0, &tmp); | |
3778 | if (rc < 0) { | |
3779 | pr_err("Unable to extract srpt_tpg_store_enable\n"); | |
3780 | return -EINVAL; | |
3781 | } | |
3782 | ||
3783 | if ((tmp != 0) && (tmp != 1)) { | |
3784 | pr_err("Illegal value for srpt_tpg_store_enable\n"); | |
3785 | return -EINVAL; | |
3786 | } | |
3787 | ||
3788 | if (tmp) { | |
88a678bb | 3789 | spin_lock_bh(&vscsi->intr_lock); |
c9b3379f | 3790 | tport->enabled = true; |
88a678bb BL |
3791 | lrc = ibmvscsis_enable_change_state(vscsi); |
3792 | if (lrc) | |
3793 | pr_err("enable_change_state failed, rc %ld state %d\n", | |
3794 | lrc, vscsi->state); | |
3795 | spin_unlock_bh(&vscsi->intr_lock); | |
3796 | } else { | |
c9b3379f | 3797 | spin_lock_bh(&vscsi->intr_lock); |
88a678bb | 3798 | tport->enabled = false; |
c9b3379f MC |
3799 | /* This simulates the server going down */ |
3800 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); | |
3801 | spin_unlock_bh(&vscsi->intr_lock); | |
88a678bb BL |
3802 | } |
3803 | ||
c9b3379f | 3804 | pr_debug("tpg_enable_store, tmp %ld, state %d\n", tmp, vscsi->state); |
88a678bb BL |
3805 | |
3806 | return count; | |
3807 | } | |
3808 | CONFIGFS_ATTR(ibmvscsis_tpg_, enable); | |
3809 | ||
3810 | static struct configfs_attribute *ibmvscsis_tpg_attrs[] = { | |
3811 | &ibmvscsis_tpg_attr_enable, | |
3812 | NULL, | |
3813 | }; | |
3814 | ||
3815 | static const struct target_core_fabric_ops ibmvscsis_ops = { | |
3816 | .module = THIS_MODULE, | |
3817 | .name = "ibmvscsis", | |
3818 | .get_fabric_name = ibmvscsis_get_fabric_name, | |
3819 | .tpg_get_wwn = ibmvscsis_get_fabric_wwn, | |
3820 | .tpg_get_tag = ibmvscsis_get_tag, | |
3821 | .tpg_get_default_depth = ibmvscsis_get_default_depth, | |
3822 | .tpg_check_demo_mode = ibmvscsis_check_true, | |
3823 | .tpg_check_demo_mode_cache = ibmvscsis_check_true, | |
3824 | .tpg_check_demo_mode_write_protect = ibmvscsis_check_false, | |
3825 | .tpg_check_prod_mode_write_protect = ibmvscsis_check_false, | |
3826 | .tpg_get_inst_index = ibmvscsis_tpg_get_inst_index, | |
3827 | .check_stop_free = ibmvscsis_check_stop_free, | |
3828 | .release_cmd = ibmvscsis_release_cmd, | |
3829 | .sess_get_index = ibmvscsis_sess_get_index, | |
3830 | .write_pending = ibmvscsis_write_pending, | |
3831 | .write_pending_status = ibmvscsis_write_pending_status, | |
3832 | .set_default_node_attributes = ibmvscsis_set_default_node_attrs, | |
3833 | .get_cmd_state = ibmvscsis_get_cmd_state, | |
3834 | .queue_data_in = ibmvscsis_queue_data_in, | |
3835 | .queue_status = ibmvscsis_queue_status, | |
3836 | .queue_tm_rsp = ibmvscsis_queue_tm_rsp, | |
3837 | .aborted_task = ibmvscsis_aborted_task, | |
3838 | /* | |
3839 | * Setup function pointers for logic in target_core_fabric_configfs.c | |
3840 | */ | |
3841 | .fabric_make_wwn = ibmvscsis_make_tport, | |
3842 | .fabric_drop_wwn = ibmvscsis_drop_tport, | |
3843 | .fabric_make_tpg = ibmvscsis_make_tpg, | |
3844 | .fabric_drop_tpg = ibmvscsis_drop_tpg, | |
3845 | ||
3846 | .tfc_wwn_attrs = ibmvscsis_wwn_attrs, | |
3847 | .tfc_tpg_base_attrs = ibmvscsis_tpg_attrs, | |
3848 | }; | |
3849 | ||
3850 | static void ibmvscsis_dev_release(struct device *dev) {}; | |
3851 | ||
3852 | static struct class_attribute ibmvscsis_class_attrs[] = { | |
3853 | __ATTR_NULL, | |
3854 | }; | |
3855 | ||
3856 | static struct device_attribute dev_attr_system_id = | |
3857 | __ATTR(system_id, S_IRUGO, system_id_show, NULL); | |
3858 | ||
3859 | static struct device_attribute dev_attr_partition_number = | |
3860 | __ATTR(partition_number, S_IRUGO, partition_number_show, NULL); | |
3861 | ||
3862 | static struct device_attribute dev_attr_unit_address = | |
3863 | __ATTR(unit_address, S_IRUGO, unit_address_show, NULL); | |
3864 | ||
3865 | static struct attribute *ibmvscsis_dev_attrs[] = { | |
3866 | &dev_attr_system_id.attr, | |
3867 | &dev_attr_partition_number.attr, | |
3868 | &dev_attr_unit_address.attr, | |
3869 | }; | |
3870 | ATTRIBUTE_GROUPS(ibmvscsis_dev); | |
3871 | ||
3872 | static struct class ibmvscsis_class = { | |
79fac9c9 MC |
3873 | .name = "ibmvscsis", |
3874 | .dev_release = ibmvscsis_dev_release, | |
3875 | .class_attrs = ibmvscsis_class_attrs, | |
3876 | .dev_groups = ibmvscsis_dev_groups, | |
88a678bb BL |
3877 | }; |
3878 | ||
3879 | static struct vio_device_id ibmvscsis_device_table[] = { | |
3880 | { "v-scsi-host", "IBM,v-scsi-host" }, | |
3881 | { "", "" } | |
3882 | }; | |
3883 | MODULE_DEVICE_TABLE(vio, ibmvscsis_device_table); | |
3884 | ||
3885 | static struct vio_driver ibmvscsis_driver = { | |
3886 | .name = "ibmvscsis", | |
3887 | .id_table = ibmvscsis_device_table, | |
3888 | .probe = ibmvscsis_probe, | |
3889 | .remove = ibmvscsis_remove, | |
3890 | }; | |
3891 | ||
3892 | /* | |
3893 | * ibmvscsis_init() - Kernel Module initialization | |
3894 | * | |
3895 | * Note: vio_register_driver() registers callback functions, and at least one | |
3896 | * of those callback functions calls TCM - Linux IO Target Subsystem, thus | |
3897 | * the SCSI Target template must be registered before vio_register_driver() | |
3898 | * is called. | |
3899 | */ | |
3900 | static int __init ibmvscsis_init(void) | |
3901 | { | |
3902 | int rc = 0; | |
3903 | ||
3904 | rc = ibmvscsis_get_system_info(); | |
3905 | if (rc) { | |
3906 | pr_err("rc %d from get_system_info\n", rc); | |
3907 | goto out; | |
3908 | } | |
3909 | ||
3910 | rc = class_register(&ibmvscsis_class); | |
3911 | if (rc) { | |
3912 | pr_err("failed class register\n"); | |
3913 | goto out; | |
3914 | } | |
3915 | ||
3916 | rc = target_register_template(&ibmvscsis_ops); | |
3917 | if (rc) { | |
3918 | pr_err("rc %d from target_register_template\n", rc); | |
3919 | goto unregister_class; | |
3920 | } | |
3921 | ||
3922 | rc = vio_register_driver(&ibmvscsis_driver); | |
3923 | if (rc) { | |
3924 | pr_err("rc %d from vio_register_driver\n", rc); | |
3925 | goto unregister_target; | |
3926 | } | |
3927 | ||
3928 | return 0; | |
3929 | ||
3930 | unregister_target: | |
3931 | target_unregister_template(&ibmvscsis_ops); | |
3932 | unregister_class: | |
3933 | class_unregister(&ibmvscsis_class); | |
3934 | out: | |
3935 | return rc; | |
3936 | } | |
3937 | ||
3938 | static void __exit ibmvscsis_exit(void) | |
3939 | { | |
3940 | pr_info("Unregister IBM virtual SCSI host driver\n"); | |
3941 | vio_unregister_driver(&ibmvscsis_driver); | |
3942 | target_unregister_template(&ibmvscsis_ops); | |
3943 | class_unregister(&ibmvscsis_class); | |
3944 | } | |
3945 | ||
3946 | MODULE_DESCRIPTION("IBMVSCSIS fabric driver"); | |
3947 | MODULE_AUTHOR("Bryant G. Ly and Michael Cyr"); | |
3948 | MODULE_LICENSE("GPL"); | |
3949 | MODULE_VERSION(IBMVSCSIS_VERSION); | |
3950 | module_init(ibmvscsis_init); | |
3951 | module_exit(ibmvscsis_exit); |