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88a678bb BL |
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 | |
387b978c | 49 | #define MAX_TXU 1024 * 1024 |
88a678bb BL |
50 | |
51 | static uint max_vdma_size = MAX_H_COPY_RDMA; | |
52 | ||
53 | static char system_id[SYS_ID_NAME_LEN] = ""; | |
54 | static char partition_name[PARTITION_NAMELEN] = "UNKNOWN"; | |
55 | static uint partition_number = -1; | |
56 | ||
57 | /* Adapter list and lock to control it */ | |
58 | static DEFINE_SPINLOCK(ibmvscsis_dev_lock); | |
59 | static LIST_HEAD(ibmvscsis_dev_list); | |
60 | ||
61 | static long ibmvscsis_parse_command(struct scsi_info *vscsi, | |
62 | struct viosrp_crq *crq); | |
63 | ||
64 | static void ibmvscsis_adapter_idle(struct scsi_info *vscsi); | |
65 | ||
66 | static void ibmvscsis_determine_resid(struct se_cmd *se_cmd, | |
67 | struct srp_rsp *rsp) | |
68 | { | |
69 | u32 residual_count = se_cmd->residual_count; | |
70 | ||
71 | if (!residual_count) | |
72 | return; | |
73 | ||
74 | if (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { | |
75 | if (se_cmd->data_direction == DMA_TO_DEVICE) { | |
76 | /* residual data from an underflow write */ | |
77 | rsp->flags = SRP_RSP_FLAG_DOUNDER; | |
78 | rsp->data_out_res_cnt = cpu_to_be32(residual_count); | |
79 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { | |
80 | /* residual data from an underflow read */ | |
81 | rsp->flags = SRP_RSP_FLAG_DIUNDER; | |
82 | rsp->data_in_res_cnt = cpu_to_be32(residual_count); | |
83 | } | |
84 | } else if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { | |
85 | if (se_cmd->data_direction == DMA_TO_DEVICE) { | |
79fac9c9 | 86 | /* residual data from an overflow write */ |
88a678bb BL |
87 | rsp->flags = SRP_RSP_FLAG_DOOVER; |
88 | rsp->data_out_res_cnt = cpu_to_be32(residual_count); | |
89 | } else if (se_cmd->data_direction == DMA_FROM_DEVICE) { | |
90 | /* residual data from an overflow read */ | |
91 | rsp->flags = SRP_RSP_FLAG_DIOVER; | |
92 | rsp->data_in_res_cnt = cpu_to_be32(residual_count); | |
93 | } | |
94 | } | |
95 | } | |
96 | ||
97 | /** | |
98 | * connection_broken() - Determine if the connection to the client is good | |
99 | * @vscsi: Pointer to our adapter structure | |
100 | * | |
101 | * This function attempts to send a ping MAD to the client. If the call to | |
102 | * queue the request returns H_CLOSED then the connection has been broken | |
103 | * and the function returns TRUE. | |
104 | * | |
105 | * EXECUTION ENVIRONMENT: | |
79fac9c9 | 106 | * Interrupt or Process environment |
88a678bb BL |
107 | */ |
108 | static bool connection_broken(struct scsi_info *vscsi) | |
109 | { | |
110 | struct viosrp_crq *crq; | |
111 | u64 buffer[2] = { 0, 0 }; | |
112 | long h_return_code; | |
113 | bool rc = false; | |
114 | ||
115 | /* create a PING crq */ | |
116 | crq = (struct viosrp_crq *)&buffer; | |
117 | crq->valid = VALID_CMD_RESP_EL; | |
118 | crq->format = MESSAGE_IN_CRQ; | |
119 | crq->status = PING; | |
120 | ||
121 | h_return_code = h_send_crq(vscsi->dds.unit_id, | |
122 | cpu_to_be64(buffer[MSG_HI]), | |
123 | cpu_to_be64(buffer[MSG_LOW])); | |
124 | ||
125 | pr_debug("connection_broken: rc %ld\n", h_return_code); | |
126 | ||
127 | if (h_return_code == H_CLOSED) | |
128 | rc = true; | |
129 | ||
130 | return rc; | |
131 | } | |
132 | ||
133 | /** | |
134 | * ibmvscsis_unregister_command_q() - Helper Function-Unregister Command Queue | |
135 | * @vscsi: Pointer to our adapter structure | |
136 | * | |
137 | * This function calls h_free_q then frees the interrupt bit etc. | |
138 | * It must release the lock before doing so because of the time it can take | |
139 | * for h_free_crq in PHYP | |
140 | * NOTE: the caller must make sure that state and or flags will prevent | |
141 | * interrupt handler from scheduling work. | |
142 | * NOTE: anyone calling this function may need to set the CRQ_CLOSED flag | |
143 | * we can't do it here, because we don't have the lock | |
144 | * | |
145 | * EXECUTION ENVIRONMENT: | |
146 | * Process level | |
147 | */ | |
148 | static long ibmvscsis_unregister_command_q(struct scsi_info *vscsi) | |
149 | { | |
150 | long qrc; | |
151 | long rc = ADAPT_SUCCESS; | |
152 | int ticks = 0; | |
153 | ||
154 | do { | |
155 | qrc = h_free_crq(vscsi->dds.unit_id); | |
156 | switch (qrc) { | |
157 | case H_SUCCESS: | |
158 | break; | |
159 | ||
160 | case H_HARDWARE: | |
161 | case H_PARAMETER: | |
162 | dev_err(&vscsi->dev, "unregister_command_q: error from h_free_crq %ld\n", | |
163 | qrc); | |
164 | rc = ERROR; | |
165 | break; | |
166 | ||
167 | case H_BUSY: | |
168 | case H_LONG_BUSY_ORDER_1_MSEC: | |
169 | /* msleep not good for small values */ | |
170 | usleep_range(1000, 2000); | |
171 | ticks += 1; | |
172 | break; | |
173 | case H_LONG_BUSY_ORDER_10_MSEC: | |
174 | usleep_range(10000, 20000); | |
175 | ticks += 10; | |
176 | break; | |
177 | case H_LONG_BUSY_ORDER_100_MSEC: | |
178 | msleep(100); | |
179 | ticks += 100; | |
180 | break; | |
181 | case H_LONG_BUSY_ORDER_1_SEC: | |
182 | ssleep(1); | |
183 | ticks += 1000; | |
184 | break; | |
185 | case H_LONG_BUSY_ORDER_10_SEC: | |
186 | ssleep(10); | |
187 | ticks += 10000; | |
188 | break; | |
189 | case H_LONG_BUSY_ORDER_100_SEC: | |
190 | ssleep(100); | |
191 | ticks += 100000; | |
192 | break; | |
193 | default: | |
194 | dev_err(&vscsi->dev, "unregister_command_q: unknown error %ld from h_free_crq\n", | |
195 | qrc); | |
196 | rc = ERROR; | |
197 | break; | |
198 | } | |
199 | ||
200 | /* | |
201 | * dont wait more then 300 seconds | |
202 | * ticks are in milliseconds more or less | |
203 | */ | |
204 | if (ticks > 300000 && qrc != H_SUCCESS) { | |
205 | rc = ERROR; | |
206 | dev_err(&vscsi->dev, "Excessive wait for h_free_crq\n"); | |
207 | } | |
208 | } while (qrc != H_SUCCESS && rc == ADAPT_SUCCESS); | |
209 | ||
210 | pr_debug("Freeing CRQ: phyp rc %ld, rc %ld\n", qrc, rc); | |
211 | ||
212 | return rc; | |
213 | } | |
214 | ||
215 | /** | |
216 | * ibmvscsis_delete_client_info() - Helper function to Delete Client Info | |
217 | * @vscsi: Pointer to our adapter structure | |
218 | * @client_closed: True if client closed its queue | |
219 | * | |
220 | * Deletes information specific to the client when the client goes away | |
221 | * | |
222 | * EXECUTION ENVIRONMENT: | |
223 | * Interrupt or Process | |
224 | */ | |
225 | static void ibmvscsis_delete_client_info(struct scsi_info *vscsi, | |
226 | bool client_closed) | |
227 | { | |
228 | vscsi->client_cap = 0; | |
229 | ||
230 | /* | |
231 | * Some things we don't want to clear if we're closing the queue, | |
232 | * because some clients don't resend the host handshake when they | |
233 | * get a transport event. | |
234 | */ | |
235 | if (client_closed) | |
236 | vscsi->client_data.os_type = 0; | |
237 | } | |
238 | ||
239 | /** | |
240 | * ibmvscsis_free_command_q() - Free Command Queue | |
241 | * @vscsi: Pointer to our adapter structure | |
242 | * | |
243 | * This function calls unregister_command_q, then clears interrupts and | |
244 | * any pending interrupt acknowledgments associated with the command q. | |
245 | * It also clears memory if there is no error. | |
246 | * | |
247 | * PHYP did not meet the PAPR architecture so that we must give up the | |
248 | * lock. This causes a timing hole regarding state change. To close the | |
249 | * hole this routine does accounting on any change that occurred during | |
250 | * the time the lock is not held. | |
251 | * NOTE: must give up and then acquire the interrupt lock, the caller must | |
252 | * make sure that state and or flags will prevent interrupt handler from | |
253 | * scheduling work. | |
254 | * | |
255 | * EXECUTION ENVIRONMENT: | |
256 | * Process level, interrupt lock is held | |
257 | */ | |
258 | static long ibmvscsis_free_command_q(struct scsi_info *vscsi) | |
259 | { | |
260 | int bytes; | |
261 | u32 flags_under_lock; | |
262 | u16 state_under_lock; | |
263 | long rc = ADAPT_SUCCESS; | |
264 | ||
265 | if (!(vscsi->flags & CRQ_CLOSED)) { | |
266 | vio_disable_interrupts(vscsi->dma_dev); | |
267 | ||
268 | state_under_lock = vscsi->new_state; | |
269 | flags_under_lock = vscsi->flags; | |
270 | vscsi->phyp_acr_state = 0; | |
271 | vscsi->phyp_acr_flags = 0; | |
272 | ||
273 | spin_unlock_bh(&vscsi->intr_lock); | |
274 | rc = ibmvscsis_unregister_command_q(vscsi); | |
275 | spin_lock_bh(&vscsi->intr_lock); | |
276 | ||
277 | if (state_under_lock != vscsi->new_state) | |
278 | vscsi->phyp_acr_state = vscsi->new_state; | |
279 | ||
280 | vscsi->phyp_acr_flags = ((~flags_under_lock) & vscsi->flags); | |
281 | ||
282 | if (rc == ADAPT_SUCCESS) { | |
283 | bytes = vscsi->cmd_q.size * PAGE_SIZE; | |
284 | memset(vscsi->cmd_q.base_addr, 0, bytes); | |
285 | vscsi->cmd_q.index = 0; | |
286 | vscsi->flags |= CRQ_CLOSED; | |
287 | ||
288 | ibmvscsis_delete_client_info(vscsi, false); | |
289 | } | |
290 | ||
291 | pr_debug("free_command_q: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n", | |
292 | vscsi->flags, vscsi->state, vscsi->phyp_acr_flags, | |
293 | vscsi->phyp_acr_state); | |
294 | } | |
295 | return rc; | |
296 | } | |
297 | ||
298 | /** | |
299 | * ibmvscsis_cmd_q_dequeue() - Get valid Command element | |
300 | * @mask: Mask to use in case index wraps | |
301 | * @current_index: Current index into command queue | |
302 | * @base_addr: Pointer to start of command queue | |
303 | * | |
304 | * Returns a pointer to a valid command element or NULL, if the command | |
305 | * queue is empty | |
306 | * | |
307 | * EXECUTION ENVIRONMENT: | |
308 | * Interrupt environment, interrupt lock held | |
309 | */ | |
310 | static struct viosrp_crq *ibmvscsis_cmd_q_dequeue(uint mask, | |
311 | uint *current_index, | |
312 | struct viosrp_crq *base_addr) | |
313 | { | |
314 | struct viosrp_crq *ptr; | |
315 | ||
316 | ptr = base_addr + *current_index; | |
317 | ||
318 | if (ptr->valid) { | |
319 | *current_index = (*current_index + 1) & mask; | |
320 | dma_rmb(); | |
321 | } else { | |
322 | ptr = NULL; | |
323 | } | |
324 | ||
325 | return ptr; | |
326 | } | |
327 | ||
328 | /** | |
79fac9c9 | 329 | * ibmvscsis_send_init_message() - send initialize message to the client |
88a678bb BL |
330 | * @vscsi: Pointer to our adapter structure |
331 | * @format: Which Init Message format to send | |
332 | * | |
333 | * EXECUTION ENVIRONMENT: | |
334 | * Interrupt environment interrupt lock held | |
335 | */ | |
336 | static long ibmvscsis_send_init_message(struct scsi_info *vscsi, u8 format) | |
337 | { | |
338 | struct viosrp_crq *crq; | |
339 | u64 buffer[2] = { 0, 0 }; | |
340 | long rc; | |
341 | ||
342 | crq = (struct viosrp_crq *)&buffer; | |
343 | crq->valid = VALID_INIT_MSG; | |
344 | crq->format = format; | |
345 | rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]), | |
346 | cpu_to_be64(buffer[MSG_LOW])); | |
347 | ||
348 | return rc; | |
349 | } | |
350 | ||
351 | /** | |
352 | * ibmvscsis_check_init_msg() - Check init message valid | |
353 | * @vscsi: Pointer to our adapter structure | |
354 | * @format: Pointer to return format of Init Message, if any. | |
355 | * Set to UNUSED_FORMAT if no Init Message in queue. | |
356 | * | |
357 | * Checks if an initialize message was queued by the initiatior | |
358 | * after the queue was created and before the interrupt was enabled. | |
359 | * | |
360 | * EXECUTION ENVIRONMENT: | |
361 | * Process level only, interrupt lock held | |
362 | */ | |
363 | static long ibmvscsis_check_init_msg(struct scsi_info *vscsi, uint *format) | |
364 | { | |
365 | struct viosrp_crq *crq; | |
366 | long rc = ADAPT_SUCCESS; | |
367 | ||
368 | crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask, &vscsi->cmd_q.index, | |
369 | vscsi->cmd_q.base_addr); | |
370 | if (!crq) { | |
371 | *format = (uint)UNUSED_FORMAT; | |
372 | } else if (crq->valid == VALID_INIT_MSG && crq->format == INIT_MSG) { | |
373 | *format = (uint)INIT_MSG; | |
374 | crq->valid = INVALIDATE_CMD_RESP_EL; | |
375 | dma_rmb(); | |
376 | ||
377 | /* | |
378 | * the caller has ensured no initialize message was | |
379 | * sent after the queue was | |
380 | * created so there should be no other message on the queue. | |
381 | */ | |
382 | crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask, | |
383 | &vscsi->cmd_q.index, | |
384 | vscsi->cmd_q.base_addr); | |
385 | if (crq) { | |
386 | *format = (uint)(crq->format); | |
79fac9c9 | 387 | rc = ERROR; |
88a678bb BL |
388 | crq->valid = INVALIDATE_CMD_RESP_EL; |
389 | dma_rmb(); | |
390 | } | |
391 | } else { | |
392 | *format = (uint)(crq->format); | |
79fac9c9 | 393 | rc = ERROR; |
88a678bb BL |
394 | crq->valid = INVALIDATE_CMD_RESP_EL; |
395 | dma_rmb(); | |
396 | } | |
397 | ||
398 | return rc; | |
399 | } | |
400 | ||
88a678bb BL |
401 | /** |
402 | * ibmvscsis_disconnect() - Helper function to disconnect | |
403 | * @work: Pointer to work_struct, gives access to our adapter structure | |
404 | * | |
405 | * An error has occurred or the driver received a Transport event, | |
406 | * and the driver is requesting that the command queue be de-registered | |
407 | * in a safe manner. If there is no outstanding I/O then we can stop the | |
408 | * queue. If we are restarting the queue it will be reflected in the | |
409 | * the state of the adapter. | |
410 | * | |
411 | * EXECUTION ENVIRONMENT: | |
412 | * Process environment | |
413 | */ | |
414 | static void ibmvscsis_disconnect(struct work_struct *work) | |
415 | { | |
416 | struct scsi_info *vscsi = container_of(work, struct scsi_info, | |
417 | proc_work); | |
418 | u16 new_state; | |
419 | bool wait_idle = false; | |
88a678bb BL |
420 | |
421 | spin_lock_bh(&vscsi->intr_lock); | |
422 | new_state = vscsi->new_state; | |
423 | vscsi->new_state = 0; | |
424 | ||
425 | pr_debug("disconnect: flags 0x%x, state 0x%hx\n", vscsi->flags, | |
426 | vscsi->state); | |
427 | ||
428 | /* | |
429 | * check which state we are in and see if we | |
430 | * should transitition to the new state | |
431 | */ | |
432 | switch (vscsi->state) { | |
79fac9c9 | 433 | /* Should never be called while in this state. */ |
88a678bb BL |
434 | case NO_QUEUE: |
435 | /* | |
436 | * Can never transition from this state; | |
437 | * igonore errors and logout. | |
438 | */ | |
439 | case UNCONFIGURING: | |
440 | break; | |
441 | ||
442 | /* can transition from this state to UNCONFIGURING */ | |
443 | case ERR_DISCONNECT: | |
444 | if (new_state == UNCONFIGURING) | |
445 | vscsi->state = new_state; | |
446 | break; | |
447 | ||
448 | /* | |
449 | * Can transition from this state to to unconfiguring | |
450 | * or err disconnect. | |
451 | */ | |
452 | case ERR_DISCONNECT_RECONNECT: | |
453 | switch (new_state) { | |
454 | case UNCONFIGURING: | |
455 | case ERR_DISCONNECT: | |
456 | vscsi->state = new_state; | |
457 | break; | |
458 | ||
459 | case WAIT_IDLE: | |
460 | break; | |
461 | default: | |
462 | break; | |
463 | } | |
464 | break; | |
465 | ||
466 | /* can transition from this state to UNCONFIGURING */ | |
467 | case ERR_DISCONNECTED: | |
468 | if (new_state == UNCONFIGURING) | |
469 | vscsi->state = new_state; | |
470 | break; | |
471 | ||
88a678bb | 472 | case WAIT_ENABLED: |
88a678bb | 473 | switch (new_state) { |
8bf11557 MC |
474 | case UNCONFIGURING: |
475 | vscsi->state = new_state; | |
476 | vscsi->flags |= RESPONSE_Q_DOWN; | |
477 | vscsi->flags &= ~(SCHEDULE_DISCONNECT | | |
478 | DISCONNECT_SCHEDULED); | |
479 | dma_rmb(); | |
480 | if (vscsi->flags & CFG_SLEEPING) { | |
481 | vscsi->flags &= ~CFG_SLEEPING; | |
482 | complete(&vscsi->unconfig); | |
483 | } | |
484 | break; | |
485 | ||
c9b3379f | 486 | /* should never happen */ |
88a678bb | 487 | case ERR_DISCONNECT: |
88a678bb | 488 | case ERR_DISCONNECT_RECONNECT: |
88a678bb | 489 | case WAIT_IDLE: |
88a678bb BL |
490 | dev_err(&vscsi->dev, "disconnect: invalid state %d for WAIT_IDLE\n", |
491 | vscsi->state); | |
492 | break; | |
493 | } | |
494 | break; | |
495 | ||
496 | case WAIT_IDLE: | |
497 | switch (new_state) { | |
8bf11557 MC |
498 | case UNCONFIGURING: |
499 | vscsi->flags |= RESPONSE_Q_DOWN; | |
500 | vscsi->state = new_state; | |
501 | vscsi->flags &= ~(SCHEDULE_DISCONNECT | | |
502 | DISCONNECT_SCHEDULED); | |
503 | ibmvscsis_free_command_q(vscsi); | |
504 | break; | |
88a678bb BL |
505 | case ERR_DISCONNECT: |
506 | case ERR_DISCONNECT_RECONNECT: | |
507 | vscsi->state = new_state; | |
508 | break; | |
509 | } | |
510 | break; | |
511 | ||
512 | /* | |
513 | * Initiator has not done a successful srp login | |
514 | * or has done a successful srp logout ( adapter was not | |
515 | * busy). In the first case there can be responses queued | |
516 | * waiting for space on the initiators response queue (MAD) | |
517 | * The second case the adapter is idle. Assume the worse case, | |
518 | * i.e. the second case. | |
519 | */ | |
520 | case WAIT_CONNECTION: | |
521 | case CONNECTED: | |
522 | case SRP_PROCESSING: | |
523 | wait_idle = true; | |
524 | vscsi->state = new_state; | |
525 | break; | |
526 | ||
527 | /* can transition from this state to UNCONFIGURING */ | |
528 | case UNDEFINED: | |
529 | if (new_state == UNCONFIGURING) | |
530 | vscsi->state = new_state; | |
531 | break; | |
532 | default: | |
533 | break; | |
534 | } | |
535 | ||
536 | if (wait_idle) { | |
537 | pr_debug("disconnect start wait, active %d, sched %d\n", | |
538 | (int)list_empty(&vscsi->active_q), | |
539 | (int)list_empty(&vscsi->schedule_q)); | |
540 | if (!list_empty(&vscsi->active_q) || | |
541 | !list_empty(&vscsi->schedule_q)) { | |
542 | vscsi->flags |= WAIT_FOR_IDLE; | |
543 | pr_debug("disconnect flags 0x%x\n", vscsi->flags); | |
544 | /* | |
545 | * This routine is can not be called with the interrupt | |
546 | * lock held. | |
547 | */ | |
548 | spin_unlock_bh(&vscsi->intr_lock); | |
549 | wait_for_completion(&vscsi->wait_idle); | |
550 | spin_lock_bh(&vscsi->intr_lock); | |
551 | } | |
552 | pr_debug("disconnect stop wait\n"); | |
553 | ||
554 | ibmvscsis_adapter_idle(vscsi); | |
555 | } | |
556 | ||
557 | spin_unlock_bh(&vscsi->intr_lock); | |
558 | } | |
559 | ||
560 | /** | |
561 | * ibmvscsis_post_disconnect() - Schedule the disconnect | |
562 | * @vscsi: Pointer to our adapter structure | |
563 | * @new_state: State to move to after disconnecting | |
564 | * @flag_bits: Flags to turn on in adapter structure | |
565 | * | |
566 | * If it's already been scheduled, then see if we need to "upgrade" | |
567 | * the new state (if the one passed in is more "severe" than the | |
568 | * previous one). | |
569 | * | |
79fac9c9 MC |
570 | * PRECONDITION: |
571 | * interrupt lock is held | |
572 | */ | |
573 | static void ibmvscsis_post_disconnect(struct scsi_info *vscsi, uint new_state, | |
574 | uint flag_bits) | |
575 | { | |
576 | uint state; | |
577 | ||
578 | /* check the validity of the new state */ | |
579 | switch (new_state) { | |
580 | case UNCONFIGURING: | |
581 | case ERR_DISCONNECT: | |
582 | case ERR_DISCONNECT_RECONNECT: | |
583 | case WAIT_IDLE: | |
584 | break; | |
585 | ||
586 | default: | |
587 | dev_err(&vscsi->dev, "post_disconnect: Invalid new state %d\n", | |
588 | new_state); | |
589 | return; | |
590 | } | |
591 | ||
592 | vscsi->flags |= flag_bits; | |
593 | ||
594 | pr_debug("post_disconnect: new_state 0x%x, flag_bits 0x%x, vscsi->flags 0x%x, state %hx\n", | |
595 | new_state, flag_bits, vscsi->flags, vscsi->state); | |
596 | ||
597 | if (!(vscsi->flags & (DISCONNECT_SCHEDULED | SCHEDULE_DISCONNECT))) { | |
598 | vscsi->flags |= SCHEDULE_DISCONNECT; | |
599 | vscsi->new_state = new_state; | |
600 | ||
601 | INIT_WORK(&vscsi->proc_work, ibmvscsis_disconnect); | |
602 | (void)queue_work(vscsi->work_q, &vscsi->proc_work); | |
603 | } else { | |
604 | if (vscsi->new_state) | |
605 | state = vscsi->new_state; | |
606 | else | |
607 | state = vscsi->state; | |
608 | ||
609 | switch (state) { | |
610 | case NO_QUEUE: | |
611 | case UNCONFIGURING: | |
612 | break; | |
613 | ||
614 | case ERR_DISCONNECTED: | |
615 | case ERR_DISCONNECT: | |
616 | case UNDEFINED: | |
617 | if (new_state == UNCONFIGURING) | |
618 | vscsi->new_state = new_state; | |
619 | break; | |
620 | ||
621 | case ERR_DISCONNECT_RECONNECT: | |
622 | switch (new_state) { | |
623 | case UNCONFIGURING: | |
624 | case ERR_DISCONNECT: | |
625 | vscsi->new_state = new_state; | |
626 | break; | |
627 | default: | |
628 | break; | |
629 | } | |
630 | break; | |
631 | ||
632 | case WAIT_ENABLED: | |
79fac9c9 MC |
633 | case WAIT_IDLE: |
634 | case WAIT_CONNECTION: | |
635 | case CONNECTED: | |
636 | case SRP_PROCESSING: | |
637 | vscsi->new_state = new_state; | |
638 | break; | |
639 | ||
640 | default: | |
641 | break; | |
642 | } | |
643 | } | |
644 | ||
645 | pr_debug("Leaving post_disconnect: flags 0x%x, new_state 0x%x\n", | |
646 | vscsi->flags, vscsi->new_state); | |
647 | } | |
648 | ||
649 | /** | |
650 | * ibmvscsis_handle_init_compl_msg() - Respond to an Init Complete Message | |
651 | * @vscsi: Pointer to our adapter structure | |
652 | * | |
653 | * Must be called with interrupt lock held. | |
654 | */ | |
655 | static long ibmvscsis_handle_init_compl_msg(struct scsi_info *vscsi) | |
656 | { | |
657 | long rc = ADAPT_SUCCESS; | |
658 | ||
659 | switch (vscsi->state) { | |
660 | case NO_QUEUE: | |
661 | case ERR_DISCONNECT: | |
662 | case ERR_DISCONNECT_RECONNECT: | |
663 | case ERR_DISCONNECTED: | |
664 | case UNCONFIGURING: | |
665 | case UNDEFINED: | |
666 | rc = ERROR; | |
667 | break; | |
668 | ||
669 | case WAIT_CONNECTION: | |
670 | vscsi->state = CONNECTED; | |
671 | break; | |
672 | ||
673 | case WAIT_IDLE: | |
674 | case SRP_PROCESSING: | |
675 | case CONNECTED: | |
676 | case WAIT_ENABLED: | |
79fac9c9 MC |
677 | default: |
678 | rc = ERROR; | |
679 | dev_err(&vscsi->dev, "init_msg: invalid state %d to get init compl msg\n", | |
680 | vscsi->state); | |
681 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
682 | break; | |
683 | } | |
684 | ||
685 | return rc; | |
686 | } | |
687 | ||
688 | /** | |
689 | * ibmvscsis_handle_init_msg() - Respond to an Init Message | |
690 | * @vscsi: Pointer to our adapter structure | |
691 | * | |
692 | * Must be called with interrupt lock held. | |
693 | */ | |
694 | static long ibmvscsis_handle_init_msg(struct scsi_info *vscsi) | |
695 | { | |
696 | long rc = ADAPT_SUCCESS; | |
697 | ||
698 | switch (vscsi->state) { | |
79fac9c9 MC |
699 | case WAIT_CONNECTION: |
700 | rc = ibmvscsis_send_init_message(vscsi, INIT_COMPLETE_MSG); | |
701 | switch (rc) { | |
702 | case H_SUCCESS: | |
703 | vscsi->state = CONNECTED; | |
704 | break; | |
705 | ||
706 | case H_PARAMETER: | |
707 | dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n", | |
708 | rc); | |
709 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); | |
710 | break; | |
711 | ||
712 | case H_DROPPED: | |
713 | dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n", | |
714 | rc); | |
715 | rc = ERROR; | |
716 | ibmvscsis_post_disconnect(vscsi, | |
717 | ERR_DISCONNECT_RECONNECT, 0); | |
718 | break; | |
719 | ||
720 | case H_CLOSED: | |
721 | pr_warn("init_msg: failed to send, rc %ld\n", rc); | |
722 | rc = 0; | |
723 | break; | |
724 | } | |
725 | break; | |
726 | ||
727 | case UNDEFINED: | |
728 | rc = ERROR; | |
729 | break; | |
730 | ||
731 | case UNCONFIGURING: | |
732 | break; | |
733 | ||
c9b3379f | 734 | case WAIT_ENABLED: |
79fac9c9 MC |
735 | case CONNECTED: |
736 | case SRP_PROCESSING: | |
737 | case WAIT_IDLE: | |
738 | case NO_QUEUE: | |
739 | case ERR_DISCONNECT: | |
740 | case ERR_DISCONNECT_RECONNECT: | |
741 | case ERR_DISCONNECTED: | |
742 | default: | |
743 | rc = ERROR; | |
744 | dev_err(&vscsi->dev, "init_msg: invalid state %d to get init msg\n", | |
745 | vscsi->state); | |
746 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
747 | break; | |
748 | } | |
749 | ||
750 | return rc; | |
751 | } | |
752 | ||
753 | /** | |
754 | * ibmvscsis_init_msg() - Respond to an init message | |
755 | * @vscsi: Pointer to our adapter structure | |
756 | * @crq: Pointer to CRQ element containing the Init Message | |
757 | * | |
758 | * EXECUTION ENVIRONMENT: | |
759 | * Interrupt, interrupt lock held | |
760 | */ | |
761 | static long ibmvscsis_init_msg(struct scsi_info *vscsi, struct viosrp_crq *crq) | |
762 | { | |
763 | long rc = ADAPT_SUCCESS; | |
764 | ||
765 | pr_debug("init_msg: state 0x%hx\n", vscsi->state); | |
766 | ||
767 | rc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO, | |
768 | (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0, | |
769 | 0); | |
770 | if (rc == H_SUCCESS) { | |
771 | vscsi->client_data.partition_number = | |
772 | be64_to_cpu(*(u64 *)vscsi->map_buf); | |
773 | pr_debug("init_msg, part num %d\n", | |
774 | vscsi->client_data.partition_number); | |
775 | } else { | |
776 | pr_debug("init_msg h_vioctl rc %ld\n", rc); | |
777 | rc = ADAPT_SUCCESS; | |
778 | } | |
779 | ||
780 | if (crq->format == INIT_MSG) { | |
781 | rc = ibmvscsis_handle_init_msg(vscsi); | |
782 | } else if (crq->format == INIT_COMPLETE_MSG) { | |
783 | rc = ibmvscsis_handle_init_compl_msg(vscsi); | |
784 | } else { | |
785 | rc = ERROR; | |
786 | dev_err(&vscsi->dev, "init_msg: invalid format %d\n", | |
787 | (uint)crq->format); | |
788 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
789 | } | |
790 | ||
791 | return rc; | |
792 | } | |
793 | ||
794 | /** | |
795 | * ibmvscsis_establish_new_q() - Establish new CRQ queue | |
796 | * @vscsi: Pointer to our adapter structure | |
79fac9c9 MC |
797 | * |
798 | * Must be called with interrupt lock held. | |
799 | */ | |
c9b3379f | 800 | static long ibmvscsis_establish_new_q(struct scsi_info *vscsi) |
79fac9c9 MC |
801 | { |
802 | long rc = ADAPT_SUCCESS; | |
803 | uint format; | |
804 | ||
805 | vscsi->flags &= PRESERVE_FLAG_FIELDS; | |
806 | vscsi->rsp_q_timer.timer_pops = 0; | |
807 | vscsi->debit = 0; | |
808 | vscsi->credit = 0; | |
809 | ||
810 | rc = vio_enable_interrupts(vscsi->dma_dev); | |
811 | if (rc) { | |
c9b3379f | 812 | pr_warn("establish_new_q: failed to enable interrupts, rc %ld\n", |
79fac9c9 MC |
813 | rc); |
814 | return rc; | |
815 | } | |
816 | ||
817 | rc = ibmvscsis_check_init_msg(vscsi, &format); | |
818 | if (rc) { | |
c9b3379f | 819 | dev_err(&vscsi->dev, "establish_new_q: check_init_msg failed, rc %ld\n", |
79fac9c9 MC |
820 | rc); |
821 | return rc; | |
822 | } | |
823 | ||
c9b3379f | 824 | if (format == UNUSED_FORMAT) { |
79fac9c9 MC |
825 | rc = ibmvscsis_send_init_message(vscsi, INIT_MSG); |
826 | switch (rc) { | |
827 | case H_SUCCESS: | |
828 | case H_DROPPED: | |
829 | case H_CLOSED: | |
830 | rc = ADAPT_SUCCESS; | |
831 | break; | |
832 | ||
833 | case H_PARAMETER: | |
834 | case H_HARDWARE: | |
835 | break; | |
836 | ||
837 | default: | |
838 | vscsi->state = UNDEFINED; | |
839 | rc = H_HARDWARE; | |
840 | break; | |
841 | } | |
c9b3379f MC |
842 | } else if (format == INIT_MSG) { |
843 | rc = ibmvscsis_handle_init_msg(vscsi); | |
79fac9c9 MC |
844 | } |
845 | ||
846 | return rc; | |
847 | } | |
848 | ||
849 | /** | |
850 | * ibmvscsis_reset_queue() - Reset CRQ Queue | |
851 | * @vscsi: Pointer to our adapter structure | |
79fac9c9 MC |
852 | * |
853 | * This function calls h_free_q and then calls h_reg_q and does all | |
854 | * of the bookkeeping to get us back to where we can communicate. | |
855 | * | |
856 | * Actually, we don't always call h_free_crq. A problem was discovered | |
857 | * where one partition would close and reopen his queue, which would | |
858 | * cause his partner to get a transport event, which would cause him to | |
859 | * close and reopen his queue, which would cause the original partition | |
860 | * to get a transport event, etc., etc. To prevent this, we don't | |
861 | * actually close our queue if the client initiated the reset, (i.e. | |
862 | * either we got a transport event or we have detected that the client's | |
863 | * queue is gone) | |
864 | * | |
865 | * EXECUTION ENVIRONMENT: | |
866 | * Process environment, called with interrupt lock held | |
867 | */ | |
c9b3379f | 868 | static void ibmvscsis_reset_queue(struct scsi_info *vscsi) |
79fac9c9 MC |
869 | { |
870 | int bytes; | |
871 | long rc = ADAPT_SUCCESS; | |
872 | ||
873 | pr_debug("reset_queue: flags 0x%x\n", vscsi->flags); | |
874 | ||
875 | /* don't reset, the client did it for us */ | |
876 | if (vscsi->flags & (CLIENT_FAILED | TRANS_EVENT)) { | |
877 | vscsi->flags &= PRESERVE_FLAG_FIELDS; | |
878 | vscsi->rsp_q_timer.timer_pops = 0; | |
879 | vscsi->debit = 0; | |
880 | vscsi->credit = 0; | |
c9b3379f | 881 | vscsi->state = WAIT_CONNECTION; |
79fac9c9 MC |
882 | vio_enable_interrupts(vscsi->dma_dev); |
883 | } else { | |
884 | rc = ibmvscsis_free_command_q(vscsi); | |
885 | if (rc == ADAPT_SUCCESS) { | |
c9b3379f | 886 | vscsi->state = WAIT_CONNECTION; |
79fac9c9 MC |
887 | |
888 | bytes = vscsi->cmd_q.size * PAGE_SIZE; | |
889 | rc = h_reg_crq(vscsi->dds.unit_id, | |
890 | vscsi->cmd_q.crq_token, bytes); | |
891 | if (rc == H_CLOSED || rc == H_SUCCESS) { | |
c9b3379f | 892 | rc = ibmvscsis_establish_new_q(vscsi); |
79fac9c9 MC |
893 | } |
894 | ||
895 | if (rc != ADAPT_SUCCESS) { | |
896 | pr_debug("reset_queue: reg_crq rc %ld\n", rc); | |
897 | ||
898 | vscsi->state = ERR_DISCONNECTED; | |
899 | vscsi->flags |= RESPONSE_Q_DOWN; | |
900 | ibmvscsis_free_command_q(vscsi); | |
901 | } | |
902 | } else { | |
903 | vscsi->state = ERR_DISCONNECTED; | |
904 | vscsi->flags |= RESPONSE_Q_DOWN; | |
905 | } | |
906 | } | |
907 | } | |
908 | ||
909 | /** | |
910 | * ibmvscsis_free_cmd_resources() - Free command resources | |
911 | * @vscsi: Pointer to our adapter structure | |
912 | * @cmd: Command which is not longer in use | |
913 | * | |
914 | * Must be called with interrupt lock held. | |
88a678bb | 915 | */ |
79fac9c9 MC |
916 | static void ibmvscsis_free_cmd_resources(struct scsi_info *vscsi, |
917 | struct ibmvscsis_cmd *cmd) | |
88a678bb | 918 | { |
79fac9c9 | 919 | struct iu_entry *iue = cmd->iue; |
88a678bb | 920 | |
79fac9c9 MC |
921 | switch (cmd->type) { |
922 | case TASK_MANAGEMENT: | |
923 | case SCSI_CDB: | |
924 | /* | |
925 | * When the queue goes down this value is cleared, so it | |
926 | * cannot be cleared in this general purpose function. | |
927 | */ | |
928 | if (vscsi->debit) | |
929 | vscsi->debit -= 1; | |
930 | break; | |
931 | case ADAPTER_MAD: | |
932 | vscsi->flags &= ~PROCESSING_MAD; | |
933 | break; | |
934 | case UNSET_TYPE: | |
88a678bb | 935 | break; |
88a678bb | 936 | default: |
79fac9c9 MC |
937 | dev_err(&vscsi->dev, "free_cmd_resources unknown type %d\n", |
938 | cmd->type); | |
939 | break; | |
88a678bb BL |
940 | } |
941 | ||
79fac9c9 MC |
942 | cmd->iue = NULL; |
943 | list_add_tail(&cmd->list, &vscsi->free_cmd); | |
944 | srp_iu_put(iue); | |
88a678bb | 945 | |
79fac9c9 MC |
946 | if (list_empty(&vscsi->active_q) && list_empty(&vscsi->schedule_q) && |
947 | list_empty(&vscsi->waiting_rsp) && (vscsi->flags & WAIT_FOR_IDLE)) { | |
948 | vscsi->flags &= ~WAIT_FOR_IDLE; | |
949 | complete(&vscsi->wait_idle); | |
88a678bb | 950 | } |
88a678bb BL |
951 | } |
952 | ||
953 | /** | |
954 | * ibmvscsis_trans_event() - Handle a Transport Event | |
955 | * @vscsi: Pointer to our adapter structure | |
956 | * @crq: Pointer to CRQ entry containing the Transport Event | |
957 | * | |
958 | * Do the logic to close the I_T nexus. This function may not | |
959 | * behave to specification. | |
960 | * | |
961 | * EXECUTION ENVIRONMENT: | |
962 | * Interrupt, interrupt lock held | |
963 | */ | |
964 | static long ibmvscsis_trans_event(struct scsi_info *vscsi, | |
965 | struct viosrp_crq *crq) | |
966 | { | |
967 | long rc = ADAPT_SUCCESS; | |
968 | ||
969 | pr_debug("trans_event: format %d, flags 0x%x, state 0x%hx\n", | |
970 | (int)crq->format, vscsi->flags, vscsi->state); | |
971 | ||
972 | switch (crq->format) { | |
973 | case MIGRATED: | |
974 | case PARTNER_FAILED: | |
975 | case PARTNER_DEREGISTER: | |
976 | ibmvscsis_delete_client_info(vscsi, true); | |
977 | break; | |
978 | ||
979 | default: | |
980 | rc = ERROR; | |
981 | dev_err(&vscsi->dev, "trans_event: invalid format %d\n", | |
982 | (uint)crq->format); | |
983 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, | |
984 | RESPONSE_Q_DOWN); | |
985 | break; | |
986 | } | |
987 | ||
988 | if (rc == ADAPT_SUCCESS) { | |
989 | switch (vscsi->state) { | |
990 | case NO_QUEUE: | |
991 | case ERR_DISCONNECTED: | |
992 | case UNDEFINED: | |
993 | break; | |
994 | ||
995 | case UNCONFIGURING: | |
996 | vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT); | |
997 | break; | |
998 | ||
999 | case WAIT_ENABLED: | |
1000 | break; | |
1001 | ||
1002 | case WAIT_CONNECTION: | |
1003 | break; | |
1004 | ||
1005 | case CONNECTED: | |
1006 | ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, | |
1007 | (RESPONSE_Q_DOWN | | |
1008 | TRANS_EVENT)); | |
1009 | break; | |
1010 | ||
88a678bb BL |
1011 | case SRP_PROCESSING: |
1012 | if ((vscsi->debit > 0) || | |
1013 | !list_empty(&vscsi->schedule_q) || | |
1014 | !list_empty(&vscsi->waiting_rsp) || | |
1015 | !list_empty(&vscsi->active_q)) { | |
1016 | pr_debug("debit %d, sched %d, wait %d, active %d\n", | |
1017 | vscsi->debit, | |
1018 | (int)list_empty(&vscsi->schedule_q), | |
1019 | (int)list_empty(&vscsi->waiting_rsp), | |
1020 | (int)list_empty(&vscsi->active_q)); | |
1021 | pr_warn("connection lost with outstanding work\n"); | |
1022 | } else { | |
1023 | pr_debug("trans_event: SRP Processing, but no outstanding work\n"); | |
1024 | } | |
1025 | ||
1026 | ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, | |
1027 | (RESPONSE_Q_DOWN | | |
1028 | TRANS_EVENT)); | |
1029 | break; | |
1030 | ||
1031 | case ERR_DISCONNECT: | |
1032 | case ERR_DISCONNECT_RECONNECT: | |
1033 | case WAIT_IDLE: | |
1034 | vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT); | |
1035 | break; | |
1036 | } | |
1037 | } | |
1038 | ||
79fac9c9 | 1039 | rc = vscsi->flags & SCHEDULE_DISCONNECT; |
88a678bb BL |
1040 | |
1041 | pr_debug("Leaving trans_event: flags 0x%x, state 0x%hx, rc %ld\n", | |
1042 | vscsi->flags, vscsi->state, rc); | |
1043 | ||
1044 | return rc; | |
1045 | } | |
1046 | ||
1047 | /** | |
1048 | * ibmvscsis_poll_cmd_q() - Poll Command Queue | |
1049 | * @vscsi: Pointer to our adapter structure | |
1050 | * | |
1051 | * Called to handle command elements that may have arrived while | |
1052 | * interrupts were disabled. | |
1053 | * | |
1054 | * EXECUTION ENVIRONMENT: | |
1055 | * intr_lock must be held | |
1056 | */ | |
1057 | static void ibmvscsis_poll_cmd_q(struct scsi_info *vscsi) | |
1058 | { | |
1059 | struct viosrp_crq *crq; | |
1060 | long rc; | |
1061 | bool ack = true; | |
1062 | volatile u8 valid; | |
1063 | ||
1064 | pr_debug("poll_cmd_q: flags 0x%x, state 0x%hx, q index %ud\n", | |
1065 | vscsi->flags, vscsi->state, vscsi->cmd_q.index); | |
1066 | ||
1067 | rc = vscsi->flags & SCHEDULE_DISCONNECT; | |
1068 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
1069 | valid = crq->valid; | |
1070 | dma_rmb(); | |
1071 | ||
1072 | while (valid) { | |
1073 | poll_work: | |
1074 | vscsi->cmd_q.index = | |
1075 | (vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask; | |
1076 | ||
1077 | if (!rc) { | |
1078 | rc = ibmvscsis_parse_command(vscsi, crq); | |
1079 | } else { | |
1080 | if ((uint)crq->valid == VALID_TRANS_EVENT) { | |
1081 | /* | |
1082 | * must service the transport layer events even | |
1083 | * in an error state, dont break out until all | |
1084 | * the consecutive transport events have been | |
1085 | * processed | |
1086 | */ | |
1087 | rc = ibmvscsis_trans_event(vscsi, crq); | |
1088 | } else if (vscsi->flags & TRANS_EVENT) { | |
1089 | /* | |
1090 | * if a tranport event has occurred leave | |
1091 | * everything but transport events on the queue | |
1092 | */ | |
1093 | pr_debug("poll_cmd_q, ignoring\n"); | |
1094 | ||
1095 | /* | |
1096 | * need to decrement the queue index so we can | |
1097 | * look at the elment again | |
1098 | */ | |
1099 | if (vscsi->cmd_q.index) | |
1100 | vscsi->cmd_q.index -= 1; | |
1101 | else | |
1102 | /* | |
1103 | * index is at 0 it just wrapped. | |
1104 | * have it index last element in q | |
1105 | */ | |
1106 | vscsi->cmd_q.index = vscsi->cmd_q.mask; | |
1107 | break; | |
1108 | } | |
1109 | } | |
1110 | ||
1111 | crq->valid = INVALIDATE_CMD_RESP_EL; | |
1112 | ||
1113 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
1114 | valid = crq->valid; | |
1115 | dma_rmb(); | |
1116 | } | |
1117 | ||
1118 | if (!rc) { | |
1119 | if (ack) { | |
1120 | vio_enable_interrupts(vscsi->dma_dev); | |
1121 | ack = false; | |
1122 | pr_debug("poll_cmd_q, reenabling interrupts\n"); | |
1123 | } | |
1124 | valid = crq->valid; | |
1125 | dma_rmb(); | |
1126 | if (valid) | |
1127 | goto poll_work; | |
1128 | } | |
1129 | ||
1130 | pr_debug("Leaving poll_cmd_q: rc %ld\n", rc); | |
1131 | } | |
1132 | ||
1133 | /** | |
1134 | * ibmvscsis_free_cmd_qs() - Free elements in queue | |
1135 | * @vscsi: Pointer to our adapter structure | |
1136 | * | |
1137 | * Free all of the elements on all queues that are waiting for | |
1138 | * whatever reason. | |
1139 | * | |
1140 | * PRECONDITION: | |
1141 | * Called with interrupt lock held | |
1142 | */ | |
1143 | static void ibmvscsis_free_cmd_qs(struct scsi_info *vscsi) | |
1144 | { | |
1145 | struct ibmvscsis_cmd *cmd, *nxt; | |
1146 | ||
1147 | pr_debug("free_cmd_qs: waiting_rsp empty %d, timer starter %d\n", | |
1148 | (int)list_empty(&vscsi->waiting_rsp), | |
1149 | vscsi->rsp_q_timer.started); | |
1150 | ||
1151 | list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp, list) { | |
1152 | list_del(&cmd->list); | |
1153 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
1154 | } | |
1155 | } | |
1156 | ||
1157 | /** | |
1158 | * ibmvscsis_get_free_cmd() - Get free command from list | |
1159 | * @vscsi: Pointer to our adapter structure | |
1160 | * | |
1161 | * Must be called with interrupt lock held. | |
1162 | */ | |
1163 | static struct ibmvscsis_cmd *ibmvscsis_get_free_cmd(struct scsi_info *vscsi) | |
1164 | { | |
1165 | struct ibmvscsis_cmd *cmd = NULL; | |
1166 | struct iu_entry *iue; | |
1167 | ||
1168 | iue = srp_iu_get(&vscsi->target); | |
1169 | if (iue) { | |
1170 | cmd = list_first_entry_or_null(&vscsi->free_cmd, | |
1171 | struct ibmvscsis_cmd, list); | |
1172 | if (cmd) { | |
98883f1b BL |
1173 | if (cmd->abort_cmd) |
1174 | cmd->abort_cmd = NULL; | |
25e78531 | 1175 | cmd->flags &= ~(DELAY_SEND); |
88a678bb BL |
1176 | list_del(&cmd->list); |
1177 | cmd->iue = iue; | |
1178 | cmd->type = UNSET_TYPE; | |
1179 | memset(&cmd->se_cmd, 0, sizeof(cmd->se_cmd)); | |
1180 | } else { | |
1181 | srp_iu_put(iue); | |
1182 | } | |
1183 | } | |
1184 | ||
1185 | return cmd; | |
1186 | } | |
1187 | ||
1188 | /** | |
1189 | * ibmvscsis_adapter_idle() - Helper function to handle idle adapter | |
1190 | * @vscsi: Pointer to our adapter structure | |
1191 | * | |
1192 | * This function is called when the adapter is idle when the driver | |
1193 | * is attempting to clear an error condition. | |
1194 | * The adapter is considered busy if any of its cmd queues | |
1195 | * are non-empty. This function can be invoked | |
1196 | * from the off level disconnect function. | |
1197 | * | |
1198 | * EXECUTION ENVIRONMENT: | |
1199 | * Process environment called with interrupt lock held | |
1200 | */ | |
1201 | static void ibmvscsis_adapter_idle(struct scsi_info *vscsi) | |
1202 | { | |
1203 | int free_qs = false; | |
1204 | ||
1205 | pr_debug("adapter_idle: flags 0x%x, state 0x%hx\n", vscsi->flags, | |
1206 | vscsi->state); | |
1207 | ||
1208 | /* Only need to free qs if we're disconnecting from client */ | |
1209 | if (vscsi->state != WAIT_CONNECTION || vscsi->flags & TRANS_EVENT) | |
1210 | free_qs = true; | |
1211 | ||
1212 | switch (vscsi->state) { | |
8bf11557 MC |
1213 | case UNCONFIGURING: |
1214 | ibmvscsis_free_command_q(vscsi); | |
1215 | dma_rmb(); | |
1216 | isync(); | |
1217 | if (vscsi->flags & CFG_SLEEPING) { | |
1218 | vscsi->flags &= ~CFG_SLEEPING; | |
1219 | complete(&vscsi->unconfig); | |
1220 | } | |
1221 | break; | |
88a678bb | 1222 | case ERR_DISCONNECT_RECONNECT: |
c9b3379f | 1223 | ibmvscsis_reset_queue(vscsi); |
88a678bb BL |
1224 | pr_debug("adapter_idle, disc_rec: flags 0x%x\n", vscsi->flags); |
1225 | break; | |
1226 | ||
1227 | case ERR_DISCONNECT: | |
1228 | ibmvscsis_free_command_q(vscsi); | |
c9b3379f | 1229 | vscsi->flags &= ~(SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED); |
88a678bb | 1230 | vscsi->flags |= RESPONSE_Q_DOWN; |
c9b3379f MC |
1231 | if (vscsi->tport.enabled) |
1232 | vscsi->state = ERR_DISCONNECTED; | |
1233 | else | |
1234 | vscsi->state = WAIT_ENABLED; | |
88a678bb BL |
1235 | pr_debug("adapter_idle, disc: flags 0x%x, state 0x%hx\n", |
1236 | vscsi->flags, vscsi->state); | |
1237 | break; | |
1238 | ||
1239 | case WAIT_IDLE: | |
1240 | vscsi->rsp_q_timer.timer_pops = 0; | |
1241 | vscsi->debit = 0; | |
1242 | vscsi->credit = 0; | |
1243 | if (vscsi->flags & TRANS_EVENT) { | |
1244 | vscsi->state = WAIT_CONNECTION; | |
1245 | vscsi->flags &= PRESERVE_FLAG_FIELDS; | |
1246 | } else { | |
1247 | vscsi->state = CONNECTED; | |
1248 | vscsi->flags &= ~DISCONNECT_SCHEDULED; | |
1249 | } | |
1250 | ||
1251 | pr_debug("adapter_idle, wait: flags 0x%x, state 0x%hx\n", | |
1252 | vscsi->flags, vscsi->state); | |
1253 | ibmvscsis_poll_cmd_q(vscsi); | |
1254 | break; | |
1255 | ||
1256 | case ERR_DISCONNECTED: | |
1257 | vscsi->flags &= ~DISCONNECT_SCHEDULED; | |
1258 | pr_debug("adapter_idle, disconnected: flags 0x%x, state 0x%hx\n", | |
1259 | vscsi->flags, vscsi->state); | |
1260 | break; | |
1261 | ||
1262 | default: | |
1263 | dev_err(&vscsi->dev, "adapter_idle: in invalid state %d\n", | |
1264 | vscsi->state); | |
1265 | break; | |
1266 | } | |
1267 | ||
1268 | if (free_qs) | |
1269 | ibmvscsis_free_cmd_qs(vscsi); | |
1270 | ||
1271 | /* | |
1272 | * There is a timing window where we could lose a disconnect request. | |
1273 | * The known path to this window occurs during the DISCONNECT_RECONNECT | |
1274 | * case above: reset_queue calls free_command_q, which will release the | |
1275 | * interrupt lock. During that time, a new post_disconnect call can be | |
1276 | * made with a "more severe" state (DISCONNECT or UNCONFIGURING). | |
1277 | * Because the DISCONNECT_SCHEDULED flag is already set, post_disconnect | |
1278 | * will only set the new_state. Now free_command_q reacquires the intr | |
1279 | * lock and clears the DISCONNECT_SCHEDULED flag (using PRESERVE_FLAG_ | |
1280 | * FIELDS), and the disconnect is lost. This is particularly bad when | |
1281 | * the new disconnect was for UNCONFIGURING, since the unconfigure hangs | |
1282 | * forever. | |
1283 | * Fix is that free command queue sets acr state and acr flags if there | |
1284 | * is a change under the lock | |
1285 | * note free command queue writes to this state it clears it | |
1286 | * before releasing the lock, different drivers call the free command | |
1287 | * queue different times so dont initialize above | |
1288 | */ | |
1289 | if (vscsi->phyp_acr_state != 0) { | |
1290 | /* | |
1291 | * set any bits in flags that may have been cleared by | |
1292 | * a call to free command queue in switch statement | |
1293 | * or reset queue | |
1294 | */ | |
1295 | vscsi->flags |= vscsi->phyp_acr_flags; | |
1296 | ibmvscsis_post_disconnect(vscsi, vscsi->phyp_acr_state, 0); | |
1297 | vscsi->phyp_acr_state = 0; | |
1298 | vscsi->phyp_acr_flags = 0; | |
1299 | ||
1300 | pr_debug("adapter_idle: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n", | |
1301 | vscsi->flags, vscsi->state, vscsi->phyp_acr_flags, | |
1302 | vscsi->phyp_acr_state); | |
1303 | } | |
1304 | ||
1305 | pr_debug("Leaving adapter_idle: flags 0x%x, state 0x%hx, new_state 0x%x\n", | |
1306 | vscsi->flags, vscsi->state, vscsi->new_state); | |
1307 | } | |
1308 | ||
1309 | /** | |
1310 | * ibmvscsis_copy_crq_packet() - Copy CRQ Packet | |
1311 | * @vscsi: Pointer to our adapter structure | |
1312 | * @cmd: Pointer to command element to use to process the request | |
1313 | * @crq: Pointer to CRQ entry containing the request | |
1314 | * | |
1315 | * Copy the srp information unit from the hosted | |
1316 | * partition using remote dma | |
1317 | * | |
1318 | * EXECUTION ENVIRONMENT: | |
1319 | * Interrupt, interrupt lock held | |
1320 | */ | |
1321 | static long ibmvscsis_copy_crq_packet(struct scsi_info *vscsi, | |
1322 | struct ibmvscsis_cmd *cmd, | |
1323 | struct viosrp_crq *crq) | |
1324 | { | |
1325 | struct iu_entry *iue = cmd->iue; | |
1326 | long rc = 0; | |
1327 | u16 len; | |
1328 | ||
1329 | len = be16_to_cpu(crq->IU_length); | |
1330 | if ((len > SRP_MAX_IU_LEN) || (len == 0)) { | |
1331 | dev_err(&vscsi->dev, "copy_crq: Invalid len %d passed", len); | |
1332 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
1333 | return SRP_VIOLATION; | |
1334 | } | |
1335 | ||
1336 | rc = h_copy_rdma(len, vscsi->dds.window[REMOTE].liobn, | |
1337 | be64_to_cpu(crq->IU_data_ptr), | |
1338 | vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma); | |
1339 | ||
1340 | switch (rc) { | |
1341 | case H_SUCCESS: | |
1342 | cmd->init_time = mftb(); | |
1343 | iue->remote_token = crq->IU_data_ptr; | |
1344 | iue->iu_len = len; | |
1345 | pr_debug("copy_crq: ioba 0x%llx, init_time 0x%llx\n", | |
1346 | be64_to_cpu(crq->IU_data_ptr), cmd->init_time); | |
1347 | break; | |
1348 | case H_PERMISSION: | |
1349 | if (connection_broken(vscsi)) | |
1350 | ibmvscsis_post_disconnect(vscsi, | |
1351 | ERR_DISCONNECT_RECONNECT, | |
1352 | (RESPONSE_Q_DOWN | | |
1353 | CLIENT_FAILED)); | |
1354 | else | |
1355 | ibmvscsis_post_disconnect(vscsi, | |
1356 | ERR_DISCONNECT_RECONNECT, 0); | |
1357 | ||
1358 | dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n", | |
1359 | rc); | |
1360 | break; | |
1361 | case H_DEST_PARM: | |
1362 | case H_SOURCE_PARM: | |
1363 | default: | |
1364 | dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n", | |
1365 | rc); | |
1366 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
1367 | break; | |
1368 | } | |
1369 | ||
1370 | return rc; | |
1371 | } | |
1372 | ||
1373 | /** | |
1374 | * ibmvscsis_adapter_info - Service an Adapter Info MAnagement Data gram | |
1375 | * @vscsi: Pointer to our adapter structure | |
1376 | * @iue: Information Unit containing the Adapter Info MAD request | |
1377 | * | |
1378 | * EXECUTION ENVIRONMENT: | |
79fac9c9 | 1379 | * Interrupt adapter lock is held |
88a678bb BL |
1380 | */ |
1381 | static long ibmvscsis_adapter_info(struct scsi_info *vscsi, | |
1382 | struct iu_entry *iue) | |
1383 | { | |
1384 | struct viosrp_adapter_info *mad = &vio_iu(iue)->mad.adapter_info; | |
1385 | struct mad_adapter_info_data *info; | |
1386 | uint flag_bits = 0; | |
1387 | dma_addr_t token; | |
1388 | long rc; | |
1389 | ||
1390 | mad->common.status = cpu_to_be16(VIOSRP_MAD_SUCCESS); | |
1391 | ||
1392 | if (be16_to_cpu(mad->common.length) > sizeof(*info)) { | |
1393 | mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1394 | return 0; | |
1395 | } | |
1396 | ||
1397 | info = dma_alloc_coherent(&vscsi->dma_dev->dev, sizeof(*info), &token, | |
a5b0e406 | 1398 | GFP_ATOMIC); |
88a678bb BL |
1399 | if (!info) { |
1400 | dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n", | |
1401 | iue->target); | |
1402 | mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1403 | return 0; | |
1404 | } | |
1405 | ||
1406 | /* Get remote info */ | |
1407 | rc = h_copy_rdma(be16_to_cpu(mad->common.length), | |
1408 | vscsi->dds.window[REMOTE].liobn, | |
1409 | be64_to_cpu(mad->buffer), | |
1410 | vscsi->dds.window[LOCAL].liobn, token); | |
1411 | ||
1412 | if (rc != H_SUCCESS) { | |
1413 | if (rc == H_PERMISSION) { | |
1414 | if (connection_broken(vscsi)) | |
1415 | flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED); | |
1416 | } | |
1417 | pr_warn("adapter_info: h_copy_rdma from client failed, rc %ld\n", | |
1418 | rc); | |
1419 | pr_debug("adapter_info: ioba 0x%llx, flags 0x%x, flag_bits 0x%x\n", | |
1420 | be64_to_cpu(mad->buffer), vscsi->flags, flag_bits); | |
1421 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, | |
1422 | flag_bits); | |
1423 | goto free_dma; | |
1424 | } | |
1425 | ||
1426 | /* | |
1427 | * Copy client info, but ignore partition number, which we | |
1428 | * already got from phyp - unless we failed to get it from | |
1429 | * phyp (e.g. if we're running on a p5 system). | |
1430 | */ | |
1431 | if (vscsi->client_data.partition_number == 0) | |
1432 | vscsi->client_data.partition_number = | |
1433 | be32_to_cpu(info->partition_number); | |
1434 | strncpy(vscsi->client_data.srp_version, info->srp_version, | |
1435 | sizeof(vscsi->client_data.srp_version)); | |
1436 | strncpy(vscsi->client_data.partition_name, info->partition_name, | |
1437 | sizeof(vscsi->client_data.partition_name)); | |
1438 | vscsi->client_data.mad_version = be32_to_cpu(info->mad_version); | |
1439 | vscsi->client_data.os_type = be32_to_cpu(info->os_type); | |
1440 | ||
1441 | /* Copy our info */ | |
1442 | strncpy(info->srp_version, SRP_VERSION, | |
1443 | sizeof(info->srp_version)); | |
1444 | strncpy(info->partition_name, vscsi->dds.partition_name, | |
1445 | sizeof(info->partition_name)); | |
1446 | info->partition_number = cpu_to_be32(vscsi->dds.partition_num); | |
1447 | info->mad_version = cpu_to_be32(MAD_VERSION_1); | |
1448 | info->os_type = cpu_to_be32(LINUX); | |
1449 | memset(&info->port_max_txu[0], 0, sizeof(info->port_max_txu)); | |
387b978c | 1450 | info->port_max_txu[0] = cpu_to_be32(MAX_TXU); |
88a678bb BL |
1451 | |
1452 | dma_wmb(); | |
1453 | rc = h_copy_rdma(sizeof(*info), vscsi->dds.window[LOCAL].liobn, | |
1454 | token, vscsi->dds.window[REMOTE].liobn, | |
1455 | be64_to_cpu(mad->buffer)); | |
1456 | switch (rc) { | |
1457 | case H_SUCCESS: | |
1458 | break; | |
1459 | ||
1460 | case H_SOURCE_PARM: | |
1461 | case H_DEST_PARM: | |
1462 | case H_PERMISSION: | |
1463 | if (connection_broken(vscsi)) | |
1464 | flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED); | |
1465 | default: | |
1466 | dev_err(&vscsi->dev, "adapter_info: h_copy_rdma to client failed, rc %ld\n", | |
1467 | rc); | |
1468 | ibmvscsis_post_disconnect(vscsi, | |
1469 | ERR_DISCONNECT_RECONNECT, | |
1470 | flag_bits); | |
1471 | break; | |
1472 | } | |
1473 | ||
1474 | free_dma: | |
1475 | dma_free_coherent(&vscsi->dma_dev->dev, sizeof(*info), info, token); | |
1476 | pr_debug("Leaving adapter_info, rc %ld\n", rc); | |
1477 | ||
1478 | return rc; | |
1479 | } | |
1480 | ||
1481 | /** | |
1482 | * ibmvscsis_cap_mad() - Service a Capabilities MAnagement Data gram | |
1483 | * @vscsi: Pointer to our adapter structure | |
1484 | * @iue: Information Unit containing the Capabilities MAD request | |
1485 | * | |
1486 | * NOTE: if you return an error from this routine you must be | |
1487 | * disconnecting or you will cause a hang | |
1488 | * | |
1489 | * EXECUTION ENVIRONMENT: | |
1490 | * Interrupt called with adapter lock held | |
1491 | */ | |
1492 | static int ibmvscsis_cap_mad(struct scsi_info *vscsi, struct iu_entry *iue) | |
1493 | { | |
1494 | struct viosrp_capabilities *mad = &vio_iu(iue)->mad.capabilities; | |
1495 | struct capabilities *cap; | |
1496 | struct mad_capability_common *common; | |
1497 | dma_addr_t token; | |
1498 | u16 olen, len, status, min_len, cap_len; | |
1499 | u32 flag; | |
1500 | uint flag_bits = 0; | |
1501 | long rc = 0; | |
1502 | ||
1503 | olen = be16_to_cpu(mad->common.length); | |
1504 | /* | |
1505 | * struct capabilities hardcodes a couple capabilities after the | |
1506 | * header, but the capabilities can actually be in any order. | |
1507 | */ | |
1508 | min_len = offsetof(struct capabilities, migration); | |
1509 | if ((olen < min_len) || (olen > PAGE_SIZE)) { | |
1510 | pr_warn("cap_mad: invalid len %d\n", olen); | |
1511 | mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1512 | return 0; | |
1513 | } | |
1514 | ||
1515 | cap = dma_alloc_coherent(&vscsi->dma_dev->dev, olen, &token, | |
a5b0e406 | 1516 | GFP_ATOMIC); |
88a678bb BL |
1517 | if (!cap) { |
1518 | dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n", | |
1519 | iue->target); | |
1520 | mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1521 | return 0; | |
1522 | } | |
1523 | rc = h_copy_rdma(olen, vscsi->dds.window[REMOTE].liobn, | |
1524 | be64_to_cpu(mad->buffer), | |
1525 | vscsi->dds.window[LOCAL].liobn, token); | |
1526 | if (rc == H_SUCCESS) { | |
1527 | strncpy(cap->name, dev_name(&vscsi->dma_dev->dev), | |
1528 | SRP_MAX_LOC_LEN); | |
1529 | ||
1530 | len = olen - min_len; | |
1531 | status = VIOSRP_MAD_SUCCESS; | |
1532 | common = (struct mad_capability_common *)&cap->migration; | |
1533 | ||
1534 | while ((len > 0) && (status == VIOSRP_MAD_SUCCESS) && !rc) { | |
1535 | pr_debug("cap_mad: len left %hd, cap type %d, cap len %hd\n", | |
1536 | len, be32_to_cpu(common->cap_type), | |
1537 | be16_to_cpu(common->length)); | |
1538 | ||
1539 | cap_len = be16_to_cpu(common->length); | |
1540 | if (cap_len > len) { | |
1541 | dev_err(&vscsi->dev, "cap_mad: cap len mismatch with total len\n"); | |
1542 | status = VIOSRP_MAD_FAILED; | |
1543 | break; | |
1544 | } | |
1545 | ||
1546 | if (cap_len == 0) { | |
1547 | dev_err(&vscsi->dev, "cap_mad: cap len is 0\n"); | |
1548 | status = VIOSRP_MAD_FAILED; | |
1549 | break; | |
1550 | } | |
1551 | ||
1552 | switch (common->cap_type) { | |
1553 | default: | |
1554 | pr_debug("cap_mad: unsupported capability\n"); | |
1555 | common->server_support = 0; | |
1556 | flag = cpu_to_be32((u32)CAP_LIST_SUPPORTED); | |
1557 | cap->flags &= ~flag; | |
1558 | break; | |
1559 | } | |
1560 | ||
1561 | len = len - cap_len; | |
1562 | common = (struct mad_capability_common *) | |
1563 | ((char *)common + cap_len); | |
1564 | } | |
1565 | ||
1566 | mad->common.status = cpu_to_be16(status); | |
1567 | ||
1568 | dma_wmb(); | |
1569 | rc = h_copy_rdma(olen, vscsi->dds.window[LOCAL].liobn, token, | |
1570 | vscsi->dds.window[REMOTE].liobn, | |
1571 | be64_to_cpu(mad->buffer)); | |
1572 | ||
1573 | if (rc != H_SUCCESS) { | |
1574 | pr_debug("cap_mad: failed to copy to client, rc %ld\n", | |
1575 | rc); | |
1576 | ||
1577 | if (rc == H_PERMISSION) { | |
1578 | if (connection_broken(vscsi)) | |
1579 | flag_bits = (RESPONSE_Q_DOWN | | |
1580 | CLIENT_FAILED); | |
1581 | } | |
1582 | ||
1583 | pr_warn("cap_mad: error copying data to client, rc %ld\n", | |
1584 | rc); | |
1585 | ibmvscsis_post_disconnect(vscsi, | |
1586 | ERR_DISCONNECT_RECONNECT, | |
1587 | flag_bits); | |
1588 | } | |
1589 | } | |
1590 | ||
1591 | dma_free_coherent(&vscsi->dma_dev->dev, olen, cap, token); | |
1592 | ||
1593 | pr_debug("Leaving cap_mad, rc %ld, client_cap 0x%x\n", | |
1594 | rc, vscsi->client_cap); | |
1595 | ||
1596 | return rc; | |
1597 | } | |
1598 | ||
1599 | /** | |
1600 | * ibmvscsis_process_mad() - Service a MAnagement Data gram | |
1601 | * @vscsi: Pointer to our adapter structure | |
1602 | * @iue: Information Unit containing the MAD request | |
1603 | * | |
1604 | * Must be called with interrupt lock held. | |
1605 | */ | |
1606 | static long ibmvscsis_process_mad(struct scsi_info *vscsi, struct iu_entry *iue) | |
1607 | { | |
1608 | struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad; | |
1609 | struct viosrp_empty_iu *empty; | |
1610 | long rc = ADAPT_SUCCESS; | |
1611 | ||
1612 | switch (be32_to_cpu(mad->type)) { | |
1613 | case VIOSRP_EMPTY_IU_TYPE: | |
1614 | empty = &vio_iu(iue)->mad.empty_iu; | |
1615 | vscsi->empty_iu_id = be64_to_cpu(empty->buffer); | |
1616 | vscsi->empty_iu_tag = be64_to_cpu(empty->common.tag); | |
1617 | mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS); | |
1618 | break; | |
1619 | case VIOSRP_ADAPTER_INFO_TYPE: | |
1620 | rc = ibmvscsis_adapter_info(vscsi, iue); | |
1621 | break; | |
1622 | case VIOSRP_CAPABILITIES_TYPE: | |
1623 | rc = ibmvscsis_cap_mad(vscsi, iue); | |
1624 | break; | |
1625 | case VIOSRP_ENABLE_FAST_FAIL: | |
1626 | if (vscsi->state == CONNECTED) { | |
1627 | vscsi->fast_fail = true; | |
1628 | mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS); | |
1629 | } else { | |
1630 | pr_warn("fast fail mad sent after login\n"); | |
1631 | mad->status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1632 | } | |
1633 | break; | |
1634 | default: | |
1635 | mad->status = cpu_to_be16(VIOSRP_MAD_NOT_SUPPORTED); | |
1636 | break; | |
1637 | } | |
1638 | ||
1639 | return rc; | |
1640 | } | |
1641 | ||
1642 | /** | |
1643 | * srp_snd_msg_failed() - Handle an error when sending a response | |
1644 | * @vscsi: Pointer to our adapter structure | |
1645 | * @rc: The return code from the h_send_crq command | |
1646 | * | |
1647 | * Must be called with interrupt lock held. | |
1648 | */ | |
1649 | static void srp_snd_msg_failed(struct scsi_info *vscsi, long rc) | |
1650 | { | |
1651 | ktime_t kt; | |
1652 | ||
1653 | if (rc != H_DROPPED) { | |
1654 | ibmvscsis_free_cmd_qs(vscsi); | |
1655 | ||
1656 | if (rc == H_CLOSED) | |
1657 | vscsi->flags |= CLIENT_FAILED; | |
1658 | ||
1659 | /* don't flag the same problem multiple times */ | |
1660 | if (!(vscsi->flags & RESPONSE_Q_DOWN)) { | |
1661 | vscsi->flags |= RESPONSE_Q_DOWN; | |
1662 | if (!(vscsi->state & (ERR_DISCONNECT | | |
1663 | ERR_DISCONNECT_RECONNECT | | |
1664 | ERR_DISCONNECTED | UNDEFINED))) { | |
1665 | dev_err(&vscsi->dev, "snd_msg_failed: setting RESPONSE_Q_DOWN, state 0x%hx, flags 0x%x, rc %ld\n", | |
1666 | vscsi->state, vscsi->flags, rc); | |
1667 | } | |
1668 | ibmvscsis_post_disconnect(vscsi, | |
1669 | ERR_DISCONNECT_RECONNECT, 0); | |
1670 | } | |
1671 | return; | |
1672 | } | |
1673 | ||
1674 | /* | |
1675 | * The response queue is full. | |
1676 | * If the server is processing SRP requests, i.e. | |
1677 | * the client has successfully done an | |
1678 | * SRP_LOGIN, then it will wait forever for room in | |
1679 | * the queue. However if the system admin | |
1680 | * is attempting to unconfigure the server then one | |
1681 | * or more children will be in a state where | |
1682 | * they are being removed. So if there is even one | |
1683 | * child being removed then the driver assumes | |
1684 | * the system admin is attempting to break the | |
1685 | * connection with the client and MAX_TIMER_POPS | |
1686 | * is honored. | |
1687 | */ | |
1688 | if ((vscsi->rsp_q_timer.timer_pops < MAX_TIMER_POPS) || | |
1689 | (vscsi->state == SRP_PROCESSING)) { | |
1690 | pr_debug("snd_msg_failed: response queue full, flags 0x%x, timer started %d, pops %d\n", | |
1691 | vscsi->flags, (int)vscsi->rsp_q_timer.started, | |
1692 | vscsi->rsp_q_timer.timer_pops); | |
1693 | ||
1694 | /* | |
1695 | * Check if the timer is running; if it | |
1696 | * is not then start it up. | |
1697 | */ | |
1698 | if (!vscsi->rsp_q_timer.started) { | |
1699 | if (vscsi->rsp_q_timer.timer_pops < | |
1700 | MAX_TIMER_POPS) { | |
8b0e1953 | 1701 | kt = WAIT_NANO_SECONDS; |
88a678bb BL |
1702 | } else { |
1703 | /* | |
1704 | * slide the timeslice if the maximum | |
1705 | * timer pops have already happened | |
1706 | */ | |
1707 | kt = ktime_set(WAIT_SECONDS, 0); | |
1708 | } | |
1709 | ||
1710 | vscsi->rsp_q_timer.started = true; | |
1711 | hrtimer_start(&vscsi->rsp_q_timer.timer, kt, | |
1712 | HRTIMER_MODE_REL); | |
1713 | } | |
1714 | } else { | |
1715 | /* | |
1716 | * TBD: Do we need to worry about this? Need to get | |
1717 | * remove working. | |
1718 | */ | |
1719 | /* | |
1720 | * waited a long time and it appears the system admin | |
1721 | * is bring this driver down | |
1722 | */ | |
1723 | vscsi->flags |= RESPONSE_Q_DOWN; | |
1724 | ibmvscsis_free_cmd_qs(vscsi); | |
1725 | /* | |
1726 | * if the driver is already attempting to disconnect | |
1727 | * from the client and has already logged an error | |
1728 | * trace this event but don't put it in the error log | |
1729 | */ | |
1730 | if (!(vscsi->state & (ERR_DISCONNECT | | |
1731 | ERR_DISCONNECT_RECONNECT | | |
1732 | ERR_DISCONNECTED | UNDEFINED))) { | |
1733 | dev_err(&vscsi->dev, "client crq full too long\n"); | |
1734 | ibmvscsis_post_disconnect(vscsi, | |
1735 | ERR_DISCONNECT_RECONNECT, | |
1736 | 0); | |
1737 | } | |
1738 | } | |
1739 | } | |
1740 | ||
1741 | /** | |
1742 | * ibmvscsis_send_messages() - Send a Response | |
1743 | * @vscsi: Pointer to our adapter structure | |
1744 | * | |
1745 | * Send a response, first checking the waiting queue. Responses are | |
1746 | * sent in order they are received. If the response cannot be sent, | |
1747 | * because the client queue is full, it stays on the waiting queue. | |
1748 | * | |
1749 | * PRECONDITION: | |
1750 | * Called with interrupt lock held | |
1751 | */ | |
1752 | static void ibmvscsis_send_messages(struct scsi_info *vscsi) | |
1753 | { | |
1754 | u64 msg_hi = 0; | |
25e78531 | 1755 | /* note do not attempt to access the IU_data_ptr with this pointer |
88a678bb BL |
1756 | * it is not valid |
1757 | */ | |
1758 | struct viosrp_crq *crq = (struct viosrp_crq *)&msg_hi; | |
1759 | struct ibmvscsis_cmd *cmd, *nxt; | |
1760 | struct iu_entry *iue; | |
1761 | long rc = ADAPT_SUCCESS; | |
25e78531 | 1762 | bool retry = false; |
88a678bb BL |
1763 | |
1764 | if (!(vscsi->flags & RESPONSE_Q_DOWN)) { | |
25e78531 BL |
1765 | do { |
1766 | retry = false; | |
1767 | list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp, | |
1768 | list) { | |
1769 | /* | |
1770 | * Check to make sure abort cmd gets processed | |
1771 | * prior to the abort tmr cmd | |
1772 | */ | |
1773 | if (cmd->flags & DELAY_SEND) | |
1774 | continue; | |
88a678bb | 1775 | |
25e78531 BL |
1776 | if (cmd->abort_cmd) { |
1777 | retry = true; | |
1778 | cmd->abort_cmd->flags &= ~(DELAY_SEND); | |
98883f1b | 1779 | cmd->abort_cmd = NULL; |
25e78531 | 1780 | } |
88a678bb | 1781 | |
25e78531 BL |
1782 | /* |
1783 | * If CMD_T_ABORTED w/o CMD_T_TAS scenarios and | |
1784 | * the case where LIO issued a | |
1785 | * ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST | |
1786 | * case then we dont send a response, since it | |
1787 | * was already done. | |
1788 | */ | |
1789 | if (cmd->se_cmd.transport_state & CMD_T_ABORTED && | |
1790 | !(cmd->se_cmd.transport_state & CMD_T_TAS)) { | |
1791 | list_del(&cmd->list); | |
1792 | ibmvscsis_free_cmd_resources(vscsi, | |
1793 | cmd); | |
75dbf2d3 BL |
1794 | /* |
1795 | * With a successfully aborted op | |
1796 | * through LIO we want to increment the | |
1797 | * the vscsi credit so that when we dont | |
1798 | * send a rsp to the original scsi abort | |
1799 | * op (h_send_crq), but the tm rsp to | |
1800 | * the abort is sent, the credit is | |
1801 | * correctly sent with the abort tm rsp. | |
1802 | * We would need 1 for the abort tm rsp | |
1803 | * and 1 credit for the aborted scsi op. | |
1804 | * Thus we need to increment here. | |
1805 | * Also we want to increment the credit | |
1806 | * here because we want to make sure | |
1807 | * cmd is actually released first | |
1808 | * otherwise the client will think it | |
1809 | * it can send a new cmd, and we could | |
1810 | * find ourselves short of cmd elements. | |
1811 | */ | |
1812 | vscsi->credit += 1; | |
25e78531 BL |
1813 | } else { |
1814 | iue = cmd->iue; | |
88a678bb | 1815 | |
25e78531 BL |
1816 | crq->valid = VALID_CMD_RESP_EL; |
1817 | crq->format = cmd->rsp.format; | |
88a678bb | 1818 | |
25e78531 BL |
1819 | if (cmd->flags & CMD_FAST_FAIL) |
1820 | crq->status = VIOSRP_ADAPTER_FAIL; | |
88a678bb | 1821 | |
25e78531 | 1822 | crq->IU_length = cpu_to_be16(cmd->rsp.len); |
88a678bb | 1823 | |
25e78531 BL |
1824 | rc = h_send_crq(vscsi->dma_dev->unit_address, |
1825 | be64_to_cpu(msg_hi), | |
1826 | be64_to_cpu(cmd->rsp.tag)); | |
88a678bb | 1827 | |
25e78531 BL |
1828 | pr_debug("send_messages: cmd %p, tag 0x%llx, rc %ld\n", |
1829 | cmd, be64_to_cpu(cmd->rsp.tag), rc); | |
1830 | ||
1831 | /* if all ok free up the command | |
1832 | * element resources | |
1833 | */ | |
1834 | if (rc == H_SUCCESS) { | |
1835 | /* some movement has occurred */ | |
1836 | vscsi->rsp_q_timer.timer_pops = 0; | |
1837 | list_del(&cmd->list); | |
1838 | ||
1839 | ibmvscsis_free_cmd_resources(vscsi, | |
1840 | cmd); | |
1841 | } else { | |
1842 | srp_snd_msg_failed(vscsi, rc); | |
1843 | break; | |
1844 | } | |
1845 | } | |
88a678bb | 1846 | } |
25e78531 | 1847 | } while (retry); |
88a678bb BL |
1848 | |
1849 | if (!rc) { | |
1850 | /* | |
1851 | * The timer could pop with the queue empty. If | |
1852 | * this happens, rc will always indicate a | |
1853 | * success; clear the pop count. | |
1854 | */ | |
1855 | vscsi->rsp_q_timer.timer_pops = 0; | |
1856 | } | |
1857 | } else { | |
1858 | ibmvscsis_free_cmd_qs(vscsi); | |
1859 | } | |
1860 | } | |
1861 | ||
1862 | /* Called with intr lock held */ | |
1863 | static void ibmvscsis_send_mad_resp(struct scsi_info *vscsi, | |
1864 | struct ibmvscsis_cmd *cmd, | |
1865 | struct viosrp_crq *crq) | |
1866 | { | |
1867 | struct iu_entry *iue = cmd->iue; | |
1868 | struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad; | |
1869 | uint flag_bits = 0; | |
1870 | long rc; | |
1871 | ||
1872 | dma_wmb(); | |
1873 | rc = h_copy_rdma(sizeof(struct mad_common), | |
1874 | vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma, | |
1875 | vscsi->dds.window[REMOTE].liobn, | |
1876 | be64_to_cpu(crq->IU_data_ptr)); | |
1877 | if (!rc) { | |
1878 | cmd->rsp.format = VIOSRP_MAD_FORMAT; | |
1879 | cmd->rsp.len = sizeof(struct mad_common); | |
1880 | cmd->rsp.tag = mad->tag; | |
1881 | list_add_tail(&cmd->list, &vscsi->waiting_rsp); | |
1882 | ibmvscsis_send_messages(vscsi); | |
1883 | } else { | |
1884 | pr_debug("Error sending mad response, rc %ld\n", rc); | |
1885 | if (rc == H_PERMISSION) { | |
1886 | if (connection_broken(vscsi)) | |
1887 | flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED); | |
1888 | } | |
1889 | dev_err(&vscsi->dev, "mad: failed to copy to client, rc %ld\n", | |
1890 | rc); | |
1891 | ||
1892 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
1893 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, | |
1894 | flag_bits); | |
1895 | } | |
1896 | } | |
1897 | ||
1898 | /** | |
1899 | * ibmvscsis_mad() - Service a MAnagement Data gram. | |
1900 | * @vscsi: Pointer to our adapter structure | |
1901 | * @crq: Pointer to the CRQ entry containing the MAD request | |
1902 | * | |
1903 | * EXECUTION ENVIRONMENT: | |
79fac9c9 | 1904 | * Interrupt, called with adapter lock held |
88a678bb BL |
1905 | */ |
1906 | static long ibmvscsis_mad(struct scsi_info *vscsi, struct viosrp_crq *crq) | |
1907 | { | |
1908 | struct iu_entry *iue; | |
1909 | struct ibmvscsis_cmd *cmd; | |
1910 | struct mad_common *mad; | |
1911 | long rc = ADAPT_SUCCESS; | |
1912 | ||
1913 | switch (vscsi->state) { | |
1914 | /* | |
1915 | * We have not exchanged Init Msgs yet, so this MAD was sent | |
1916 | * before the last Transport Event; client will not be | |
1917 | * expecting a response. | |
1918 | */ | |
1919 | case WAIT_CONNECTION: | |
1920 | pr_debug("mad: in Wait Connection state, ignoring MAD, flags %d\n", | |
1921 | vscsi->flags); | |
1922 | return ADAPT_SUCCESS; | |
1923 | ||
1924 | case SRP_PROCESSING: | |
1925 | case CONNECTED: | |
1926 | break; | |
1927 | ||
1928 | /* | |
1929 | * We should never get here while we're in these states. | |
1930 | * Just log an error and get out. | |
1931 | */ | |
1932 | case UNCONFIGURING: | |
1933 | case WAIT_IDLE: | |
1934 | case ERR_DISCONNECT: | |
1935 | case ERR_DISCONNECT_RECONNECT: | |
1936 | default: | |
1937 | dev_err(&vscsi->dev, "mad: invalid adapter state %d for mad\n", | |
1938 | vscsi->state); | |
1939 | return ADAPT_SUCCESS; | |
1940 | } | |
1941 | ||
1942 | cmd = ibmvscsis_get_free_cmd(vscsi); | |
1943 | if (!cmd) { | |
1944 | dev_err(&vscsi->dev, "mad: failed to get cmd, debit %d\n", | |
1945 | vscsi->debit); | |
1946 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
1947 | return ERROR; | |
1948 | } | |
1949 | iue = cmd->iue; | |
1950 | cmd->type = ADAPTER_MAD; | |
1951 | ||
1952 | rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq); | |
1953 | if (!rc) { | |
1954 | mad = (struct mad_common *)&vio_iu(iue)->mad; | |
1955 | ||
1956 | pr_debug("mad: type %d\n", be32_to_cpu(mad->type)); | |
1957 | ||
11950d70 | 1958 | rc = ibmvscsis_process_mad(vscsi, iue); |
88a678bb BL |
1959 | |
1960 | pr_debug("mad: status %hd, rc %ld\n", be16_to_cpu(mad->status), | |
1961 | rc); | |
1962 | ||
1963 | if (!rc) | |
1964 | ibmvscsis_send_mad_resp(vscsi, cmd, crq); | |
1965 | } else { | |
1966 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
1967 | } | |
1968 | ||
1969 | pr_debug("Leaving mad, rc %ld\n", rc); | |
1970 | return rc; | |
1971 | } | |
1972 | ||
1973 | /** | |
1974 | * ibmvscsis_login_rsp() - Create/copy a login response notice to the client | |
1975 | * @vscsi: Pointer to our adapter structure | |
1976 | * @cmd: Pointer to the command for the SRP Login request | |
1977 | * | |
1978 | * EXECUTION ENVIRONMENT: | |
1979 | * Interrupt, interrupt lock held | |
1980 | */ | |
1981 | static long ibmvscsis_login_rsp(struct scsi_info *vscsi, | |
1982 | struct ibmvscsis_cmd *cmd) | |
1983 | { | |
1984 | struct iu_entry *iue = cmd->iue; | |
1985 | struct srp_login_rsp *rsp = &vio_iu(iue)->srp.login_rsp; | |
1986 | struct format_code *fmt; | |
1987 | uint flag_bits = 0; | |
1988 | long rc = ADAPT_SUCCESS; | |
1989 | ||
1990 | memset(rsp, 0, sizeof(struct srp_login_rsp)); | |
1991 | ||
1992 | rsp->opcode = SRP_LOGIN_RSP; | |
1993 | rsp->req_lim_delta = cpu_to_be32(vscsi->request_limit); | |
1994 | rsp->tag = cmd->rsp.tag; | |
1995 | rsp->max_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN); | |
1996 | rsp->max_ti_iu_len = cpu_to_be32(SRP_MAX_IU_LEN); | |
1997 | fmt = (struct format_code *)&rsp->buf_fmt; | |
1998 | fmt->buffers = SUPPORTED_FORMATS; | |
1999 | vscsi->credit = 0; | |
2000 | ||
2001 | cmd->rsp.len = sizeof(struct srp_login_rsp); | |
2002 | ||
2003 | dma_wmb(); | |
2004 | rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn, | |
2005 | iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn, | |
2006 | be64_to_cpu(iue->remote_token)); | |
2007 | ||
2008 | switch (rc) { | |
2009 | case H_SUCCESS: | |
2010 | break; | |
2011 | ||
2012 | case H_PERMISSION: | |
2013 | if (connection_broken(vscsi)) | |
2014 | flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED; | |
2015 | dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n", | |
2016 | rc); | |
2017 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, | |
2018 | flag_bits); | |
2019 | break; | |
2020 | case H_SOURCE_PARM: | |
2021 | case H_DEST_PARM: | |
2022 | default: | |
2023 | dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n", | |
2024 | rc); | |
2025 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2026 | break; | |
2027 | } | |
2028 | ||
2029 | return rc; | |
2030 | } | |
2031 | ||
2032 | /** | |
2033 | * ibmvscsis_srp_login_rej() - Create/copy a login rejection notice to client | |
2034 | * @vscsi: Pointer to our adapter structure | |
2035 | * @cmd: Pointer to the command for the SRP Login request | |
2036 | * @reason: The reason the SRP Login is being rejected, per SRP protocol | |
2037 | * | |
2038 | * EXECUTION ENVIRONMENT: | |
2039 | * Interrupt, interrupt lock held | |
2040 | */ | |
2041 | static long ibmvscsis_srp_login_rej(struct scsi_info *vscsi, | |
2042 | struct ibmvscsis_cmd *cmd, u32 reason) | |
2043 | { | |
2044 | struct iu_entry *iue = cmd->iue; | |
2045 | struct srp_login_rej *rej = &vio_iu(iue)->srp.login_rej; | |
2046 | struct format_code *fmt; | |
2047 | uint flag_bits = 0; | |
2048 | long rc = ADAPT_SUCCESS; | |
2049 | ||
2050 | memset(rej, 0, sizeof(*rej)); | |
2051 | ||
2052 | rej->opcode = SRP_LOGIN_REJ; | |
2053 | rej->reason = cpu_to_be32(reason); | |
2054 | rej->tag = cmd->rsp.tag; | |
2055 | fmt = (struct format_code *)&rej->buf_fmt; | |
2056 | fmt->buffers = SUPPORTED_FORMATS; | |
2057 | ||
2058 | cmd->rsp.len = sizeof(*rej); | |
2059 | ||
2060 | dma_wmb(); | |
2061 | rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn, | |
2062 | iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn, | |
2063 | be64_to_cpu(iue->remote_token)); | |
2064 | ||
2065 | switch (rc) { | |
2066 | case H_SUCCESS: | |
2067 | break; | |
2068 | case H_PERMISSION: | |
2069 | if (connection_broken(vscsi)) | |
79fac9c9 | 2070 | flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED; |
88a678bb BL |
2071 | dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n", |
2072 | rc); | |
2073 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, | |
2074 | flag_bits); | |
2075 | break; | |
2076 | case H_SOURCE_PARM: | |
2077 | case H_DEST_PARM: | |
2078 | default: | |
2079 | dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n", | |
2080 | rc); | |
2081 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2082 | break; | |
2083 | } | |
2084 | ||
2085 | return rc; | |
2086 | } | |
2087 | ||
2088 | static int ibmvscsis_make_nexus(struct ibmvscsis_tport *tport) | |
2089 | { | |
2090 | char *name = tport->tport_name; | |
2091 | struct ibmvscsis_nexus *nexus; | |
2092 | int rc; | |
2093 | ||
2094 | if (tport->ibmv_nexus) { | |
2095 | pr_debug("tport->ibmv_nexus already exists\n"); | |
2096 | return 0; | |
2097 | } | |
2098 | ||
2099 | nexus = kzalloc(sizeof(*nexus), GFP_KERNEL); | |
2100 | if (!nexus) { | |
2101 | pr_err("Unable to allocate struct ibmvscsis_nexus\n"); | |
2102 | return -ENOMEM; | |
2103 | } | |
2104 | ||
2105 | nexus->se_sess = target_alloc_session(&tport->se_tpg, 0, 0, | |
2106 | TARGET_PROT_NORMAL, name, nexus, | |
2107 | NULL); | |
2108 | if (IS_ERR(nexus->se_sess)) { | |
2109 | rc = PTR_ERR(nexus->se_sess); | |
2110 | goto transport_init_fail; | |
2111 | } | |
2112 | ||
2113 | tport->ibmv_nexus = nexus; | |
2114 | ||
2115 | return 0; | |
2116 | ||
2117 | transport_init_fail: | |
2118 | kfree(nexus); | |
2119 | return rc; | |
2120 | } | |
2121 | ||
2122 | static int ibmvscsis_drop_nexus(struct ibmvscsis_tport *tport) | |
2123 | { | |
2124 | struct se_session *se_sess; | |
2125 | struct ibmvscsis_nexus *nexus; | |
2126 | ||
2127 | nexus = tport->ibmv_nexus; | |
2128 | if (!nexus) | |
2129 | return -ENODEV; | |
2130 | ||
2131 | se_sess = nexus->se_sess; | |
2132 | if (!se_sess) | |
2133 | return -ENODEV; | |
2134 | ||
2135 | /* | |
2136 | * Release the SCSI I_T Nexus to the emulated ibmvscsis Target Port | |
2137 | */ | |
712db3eb BL |
2138 | target_wait_for_sess_cmds(se_sess); |
2139 | transport_deregister_session_configfs(se_sess); | |
88a678bb BL |
2140 | transport_deregister_session(se_sess); |
2141 | tport->ibmv_nexus = NULL; | |
2142 | kfree(nexus); | |
2143 | ||
2144 | return 0; | |
2145 | } | |
2146 | ||
2147 | /** | |
2148 | * ibmvscsis_srp_login() - Process an SRP Login Request | |
2149 | * @vscsi: Pointer to our adapter structure | |
2150 | * @cmd: Command element to use to process the SRP Login request | |
2151 | * @crq: Pointer to CRQ entry containing the SRP Login request | |
2152 | * | |
2153 | * EXECUTION ENVIRONMENT: | |
2154 | * Interrupt, called with interrupt lock held | |
2155 | */ | |
2156 | static long ibmvscsis_srp_login(struct scsi_info *vscsi, | |
2157 | struct ibmvscsis_cmd *cmd, | |
2158 | struct viosrp_crq *crq) | |
2159 | { | |
2160 | struct iu_entry *iue = cmd->iue; | |
2161 | struct srp_login_req *req = &vio_iu(iue)->srp.login_req; | |
2162 | struct port_id { | |
2163 | __be64 id_extension; | |
2164 | __be64 io_guid; | |
2165 | } *iport, *tport; | |
2166 | struct format_code *fmt; | |
2167 | u32 reason = 0x0; | |
2168 | long rc = ADAPT_SUCCESS; | |
2169 | ||
2170 | iport = (struct port_id *)req->initiator_port_id; | |
2171 | tport = (struct port_id *)req->target_port_id; | |
2172 | fmt = (struct format_code *)&req->req_buf_fmt; | |
2173 | if (be32_to_cpu(req->req_it_iu_len) > SRP_MAX_IU_LEN) | |
2174 | reason = SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE; | |
2175 | else if (be32_to_cpu(req->req_it_iu_len) < 64) | |
2176 | reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL; | |
2177 | else if ((be64_to_cpu(iport->id_extension) > (MAX_NUM_PORTS - 1)) || | |
2178 | (be64_to_cpu(tport->id_extension) > (MAX_NUM_PORTS - 1))) | |
2179 | reason = SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL; | |
2180 | else if (req->req_flags & SRP_MULTICHAN_MULTI) | |
2181 | reason = SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED; | |
2182 | else if (fmt->buffers & (~SUPPORTED_FORMATS)) | |
2183 | reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT; | |
f6dbe38e | 2184 | else if ((fmt->buffers & SUPPORTED_FORMATS) == 0) |
88a678bb BL |
2185 | reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT; |
2186 | ||
2187 | if (vscsi->state == SRP_PROCESSING) | |
2188 | reason = SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED; | |
2189 | ||
2190 | rc = ibmvscsis_make_nexus(&vscsi->tport); | |
2191 | if (rc) | |
2192 | reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL; | |
2193 | ||
2194 | cmd->rsp.format = VIOSRP_SRP_FORMAT; | |
2195 | cmd->rsp.tag = req->tag; | |
2196 | ||
2197 | pr_debug("srp_login: reason 0x%x\n", reason); | |
2198 | ||
2199 | if (reason) | |
2200 | rc = ibmvscsis_srp_login_rej(vscsi, cmd, reason); | |
2201 | else | |
2202 | rc = ibmvscsis_login_rsp(vscsi, cmd); | |
2203 | ||
2204 | if (!rc) { | |
2205 | if (!reason) | |
2206 | vscsi->state = SRP_PROCESSING; | |
2207 | ||
2208 | list_add_tail(&cmd->list, &vscsi->waiting_rsp); | |
2209 | ibmvscsis_send_messages(vscsi); | |
2210 | } else { | |
2211 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2212 | } | |
2213 | ||
2214 | pr_debug("Leaving srp_login, rc %ld\n", rc); | |
2215 | return rc; | |
2216 | } | |
2217 | ||
2218 | /** | |
2219 | * ibmvscsis_srp_i_logout() - Helper Function to close I_T Nexus | |
2220 | * @vscsi: Pointer to our adapter structure | |
2221 | * @cmd: Command element to use to process the Implicit Logout request | |
2222 | * @crq: Pointer to CRQ entry containing the Implicit Logout request | |
2223 | * | |
2224 | * Do the logic to close the I_T nexus. This function may not | |
2225 | * behave to specification. | |
2226 | * | |
2227 | * EXECUTION ENVIRONMENT: | |
2228 | * Interrupt, interrupt lock held | |
2229 | */ | |
2230 | static long ibmvscsis_srp_i_logout(struct scsi_info *vscsi, | |
2231 | struct ibmvscsis_cmd *cmd, | |
2232 | struct viosrp_crq *crq) | |
2233 | { | |
2234 | struct iu_entry *iue = cmd->iue; | |
2235 | struct srp_i_logout *log_out = &vio_iu(iue)->srp.i_logout; | |
2236 | long rc = ADAPT_SUCCESS; | |
2237 | ||
2238 | if ((vscsi->debit > 0) || !list_empty(&vscsi->schedule_q) || | |
2239 | !list_empty(&vscsi->waiting_rsp)) { | |
2240 | dev_err(&vscsi->dev, "i_logout: outstanding work\n"); | |
2241 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); | |
2242 | } else { | |
2243 | cmd->rsp.format = SRP_FORMAT; | |
2244 | cmd->rsp.tag = log_out->tag; | |
2245 | cmd->rsp.len = sizeof(struct mad_common); | |
2246 | list_add_tail(&cmd->list, &vscsi->waiting_rsp); | |
2247 | ibmvscsis_send_messages(vscsi); | |
2248 | ||
2249 | ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0); | |
2250 | } | |
2251 | ||
2252 | return rc; | |
2253 | } | |
2254 | ||
2255 | /* Called with intr lock held */ | |
2256 | static void ibmvscsis_srp_cmd(struct scsi_info *vscsi, struct viosrp_crq *crq) | |
2257 | { | |
2258 | struct ibmvscsis_cmd *cmd; | |
2259 | struct iu_entry *iue; | |
2260 | struct srp_cmd *srp; | |
2261 | struct srp_tsk_mgmt *tsk; | |
2262 | long rc; | |
2263 | ||
2264 | if (vscsi->request_limit - vscsi->debit <= 0) { | |
2265 | /* Client has exceeded request limit */ | |
2266 | dev_err(&vscsi->dev, "Client exceeded the request limit (%d), debit %d\n", | |
2267 | vscsi->request_limit, vscsi->debit); | |
2268 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2269 | return; | |
2270 | } | |
2271 | ||
2272 | cmd = ibmvscsis_get_free_cmd(vscsi); | |
2273 | if (!cmd) { | |
2274 | dev_err(&vscsi->dev, "srp_cmd failed to get cmd, debit %d\n", | |
2275 | vscsi->debit); | |
2276 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2277 | return; | |
2278 | } | |
2279 | iue = cmd->iue; | |
2280 | srp = &vio_iu(iue)->srp.cmd; | |
2281 | ||
2282 | rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq); | |
2283 | if (rc) { | |
2284 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2285 | return; | |
2286 | } | |
2287 | ||
2288 | if (vscsi->state == SRP_PROCESSING) { | |
2289 | switch (srp->opcode) { | |
2290 | case SRP_LOGIN_REQ: | |
2291 | rc = ibmvscsis_srp_login(vscsi, cmd, crq); | |
2292 | break; | |
2293 | ||
2294 | case SRP_TSK_MGMT: | |
2295 | tsk = &vio_iu(iue)->srp.tsk_mgmt; | |
2296 | pr_debug("tsk_mgmt tag: %llu (0x%llx)\n", tsk->tag, | |
2297 | tsk->tag); | |
2298 | cmd->rsp.tag = tsk->tag; | |
2299 | vscsi->debit += 1; | |
2300 | cmd->type = TASK_MANAGEMENT; | |
2301 | list_add_tail(&cmd->list, &vscsi->schedule_q); | |
2302 | queue_work(vscsi->work_q, &cmd->work); | |
2303 | break; | |
2304 | ||
2305 | case SRP_CMD: | |
2306 | pr_debug("srp_cmd tag: %llu (0x%llx)\n", srp->tag, | |
2307 | srp->tag); | |
2308 | cmd->rsp.tag = srp->tag; | |
2309 | vscsi->debit += 1; | |
2310 | cmd->type = SCSI_CDB; | |
2311 | /* | |
2312 | * We want to keep track of work waiting for | |
2313 | * the workqueue. | |
2314 | */ | |
2315 | list_add_tail(&cmd->list, &vscsi->schedule_q); | |
2316 | queue_work(vscsi->work_q, &cmd->work); | |
2317 | break; | |
2318 | ||
2319 | case SRP_I_LOGOUT: | |
2320 | rc = ibmvscsis_srp_i_logout(vscsi, cmd, crq); | |
2321 | break; | |
2322 | ||
2323 | case SRP_CRED_RSP: | |
2324 | case SRP_AER_RSP: | |
2325 | default: | |
2326 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2327 | dev_err(&vscsi->dev, "invalid srp cmd, opcode %d\n", | |
2328 | (uint)srp->opcode); | |
2329 | ibmvscsis_post_disconnect(vscsi, | |
2330 | ERR_DISCONNECT_RECONNECT, 0); | |
2331 | break; | |
2332 | } | |
2333 | } else if (srp->opcode == SRP_LOGIN_REQ && vscsi->state == CONNECTED) { | |
2334 | rc = ibmvscsis_srp_login(vscsi, cmd, crq); | |
2335 | } else { | |
2336 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2337 | dev_err(&vscsi->dev, "Invalid state %d to handle srp cmd\n", | |
2338 | vscsi->state); | |
2339 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2340 | } | |
2341 | } | |
2342 | ||
2343 | /** | |
2344 | * ibmvscsis_ping_response() - Respond to a ping request | |
2345 | * @vscsi: Pointer to our adapter structure | |
2346 | * | |
2347 | * Let the client know that the server is alive and waiting on | |
2348 | * its native I/O stack. | |
2349 | * If any type of error occurs from the call to queue a ping | |
2350 | * response then the client is either not accepting or receiving | |
2351 | * interrupts. Disconnect with an error. | |
2352 | * | |
2353 | * EXECUTION ENVIRONMENT: | |
2354 | * Interrupt, interrupt lock held | |
2355 | */ | |
2356 | static long ibmvscsis_ping_response(struct scsi_info *vscsi) | |
2357 | { | |
2358 | struct viosrp_crq *crq; | |
2359 | u64 buffer[2] = { 0, 0 }; | |
2360 | long rc; | |
2361 | ||
2362 | crq = (struct viosrp_crq *)&buffer; | |
2363 | crq->valid = VALID_CMD_RESP_EL; | |
2364 | crq->format = (u8)MESSAGE_IN_CRQ; | |
2365 | crq->status = PING_RESPONSE; | |
2366 | ||
2367 | rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]), | |
2368 | cpu_to_be64(buffer[MSG_LOW])); | |
2369 | ||
2370 | switch (rc) { | |
2371 | case H_SUCCESS: | |
2372 | break; | |
2373 | case H_CLOSED: | |
2374 | vscsi->flags |= CLIENT_FAILED; | |
2375 | case H_DROPPED: | |
2376 | vscsi->flags |= RESPONSE_Q_DOWN; | |
2377 | case H_REMOTE_PARM: | |
2378 | dev_err(&vscsi->dev, "ping_response: h_send_crq failed, rc %ld\n", | |
2379 | rc); | |
2380 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2381 | break; | |
2382 | default: | |
2383 | dev_err(&vscsi->dev, "ping_response: h_send_crq returned unknown rc %ld\n", | |
2384 | rc); | |
2385 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); | |
2386 | break; | |
2387 | } | |
2388 | ||
2389 | return rc; | |
2390 | } | |
2391 | ||
88a678bb BL |
2392 | /** |
2393 | * ibmvscsis_parse_command() - Parse an element taken from the cmd rsp queue. | |
2394 | * @vscsi: Pointer to our adapter structure | |
2395 | * @crq: Pointer to CRQ element containing the SRP request | |
2396 | * | |
2397 | * This function will return success if the command queue element is valid | |
2398 | * and the srp iu or MAD request it pointed to was also valid. That does | |
2399 | * not mean that an error was not returned to the client. | |
2400 | * | |
2401 | * EXECUTION ENVIRONMENT: | |
2402 | * Interrupt, intr lock held | |
2403 | */ | |
2404 | static long ibmvscsis_parse_command(struct scsi_info *vscsi, | |
2405 | struct viosrp_crq *crq) | |
2406 | { | |
2407 | long rc = ADAPT_SUCCESS; | |
2408 | ||
2409 | switch (crq->valid) { | |
2410 | case VALID_CMD_RESP_EL: | |
2411 | switch (crq->format) { | |
2412 | case OS400_FORMAT: | |
2413 | case AIX_FORMAT: | |
2414 | case LINUX_FORMAT: | |
2415 | case MAD_FORMAT: | |
2416 | if (vscsi->flags & PROCESSING_MAD) { | |
2417 | rc = ERROR; | |
2418 | dev_err(&vscsi->dev, "parse_command: already processing mad\n"); | |
2419 | ibmvscsis_post_disconnect(vscsi, | |
2420 | ERR_DISCONNECT_RECONNECT, | |
2421 | 0); | |
2422 | } else { | |
2423 | vscsi->flags |= PROCESSING_MAD; | |
2424 | rc = ibmvscsis_mad(vscsi, crq); | |
2425 | } | |
2426 | break; | |
2427 | ||
2428 | case SRP_FORMAT: | |
2429 | ibmvscsis_srp_cmd(vscsi, crq); | |
2430 | break; | |
2431 | ||
2432 | case MESSAGE_IN_CRQ: | |
2433 | if (crq->status == PING) | |
2434 | ibmvscsis_ping_response(vscsi); | |
2435 | break; | |
2436 | ||
2437 | default: | |
2438 | dev_err(&vscsi->dev, "parse_command: invalid format %d\n", | |
2439 | (uint)crq->format); | |
2440 | ibmvscsis_post_disconnect(vscsi, | |
2441 | ERR_DISCONNECT_RECONNECT, 0); | |
2442 | break; | |
2443 | } | |
2444 | break; | |
2445 | ||
2446 | case VALID_TRANS_EVENT: | |
79fac9c9 | 2447 | rc = ibmvscsis_trans_event(vscsi, crq); |
88a678bb BL |
2448 | break; |
2449 | ||
2450 | case VALID_INIT_MSG: | |
2451 | rc = ibmvscsis_init_msg(vscsi, crq); | |
2452 | break; | |
2453 | ||
2454 | default: | |
2455 | dev_err(&vscsi->dev, "parse_command: invalid valid field %d\n", | |
2456 | (uint)crq->valid); | |
2457 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2458 | break; | |
2459 | } | |
2460 | ||
2461 | /* | |
2462 | * Return only what the interrupt handler cares | |
2463 | * about. Most errors we keep right on trucking. | |
2464 | */ | |
2465 | rc = vscsi->flags & SCHEDULE_DISCONNECT; | |
2466 | ||
2467 | return rc; | |
2468 | } | |
2469 | ||
2470 | static int read_dma_window(struct scsi_info *vscsi) | |
2471 | { | |
2472 | struct vio_dev *vdev = vscsi->dma_dev; | |
2473 | const __be32 *dma_window; | |
2474 | const __be32 *prop; | |
2475 | ||
2476 | /* TODO Using of_parse_dma_window would be better, but it doesn't give | |
2477 | * a way to read multiple windows without already knowing the size of | |
2478 | * a window or the number of windows. | |
2479 | */ | |
2480 | dma_window = (const __be32 *)vio_get_attribute(vdev, | |
2481 | "ibm,my-dma-window", | |
2482 | NULL); | |
2483 | if (!dma_window) { | |
2484 | pr_err("Couldn't find ibm,my-dma-window property\n"); | |
2485 | return -1; | |
2486 | } | |
2487 | ||
2488 | vscsi->dds.window[LOCAL].liobn = be32_to_cpu(*dma_window); | |
2489 | dma_window++; | |
2490 | ||
2491 | prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-address-cells", | |
2492 | NULL); | |
2493 | if (!prop) { | |
2494 | pr_warn("Couldn't find ibm,#dma-address-cells property\n"); | |
2495 | dma_window++; | |
2496 | } else { | |
2497 | dma_window += be32_to_cpu(*prop); | |
2498 | } | |
2499 | ||
2500 | prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-size-cells", | |
2501 | NULL); | |
2502 | if (!prop) { | |
2503 | pr_warn("Couldn't find ibm,#dma-size-cells property\n"); | |
2504 | dma_window++; | |
2505 | } else { | |
2506 | dma_window += be32_to_cpu(*prop); | |
2507 | } | |
2508 | ||
2509 | /* dma_window should point to the second window now */ | |
2510 | vscsi->dds.window[REMOTE].liobn = be32_to_cpu(*dma_window); | |
2511 | ||
2512 | return 0; | |
2513 | } | |
2514 | ||
2515 | static struct ibmvscsis_tport *ibmvscsis_lookup_port(const char *name) | |
2516 | { | |
2517 | struct ibmvscsis_tport *tport = NULL; | |
2518 | struct vio_dev *vdev; | |
2519 | struct scsi_info *vscsi; | |
2520 | ||
2521 | spin_lock_bh(&ibmvscsis_dev_lock); | |
2522 | list_for_each_entry(vscsi, &ibmvscsis_dev_list, list) { | |
2523 | vdev = vscsi->dma_dev; | |
2524 | if (!strcmp(dev_name(&vdev->dev), name)) { | |
2525 | tport = &vscsi->tport; | |
2526 | break; | |
2527 | } | |
2528 | } | |
2529 | spin_unlock_bh(&ibmvscsis_dev_lock); | |
2530 | ||
2531 | return tport; | |
2532 | } | |
2533 | ||
2534 | /** | |
2535 | * ibmvscsis_parse_cmd() - Parse SRP Command | |
2536 | * @vscsi: Pointer to our adapter structure | |
2537 | * @cmd: Pointer to command element with SRP command | |
2538 | * | |
2539 | * Parse the srp command; if it is valid then submit it to tcm. | |
2540 | * Note: The return code does not reflect the status of the SCSI CDB. | |
2541 | * | |
2542 | * EXECUTION ENVIRONMENT: | |
2543 | * Process level | |
2544 | */ | |
2545 | static void ibmvscsis_parse_cmd(struct scsi_info *vscsi, | |
2546 | struct ibmvscsis_cmd *cmd) | |
2547 | { | |
2548 | struct iu_entry *iue = cmd->iue; | |
2549 | struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf; | |
2550 | struct ibmvscsis_nexus *nexus; | |
2551 | u64 data_len = 0; | |
2552 | enum dma_data_direction dir; | |
2553 | int attr = 0; | |
2554 | int rc = 0; | |
2555 | ||
2556 | nexus = vscsi->tport.ibmv_nexus; | |
2557 | /* | |
2558 | * additional length in bytes. Note that the SRP spec says that | |
2559 | * additional length is in 4-byte words, but technically the | |
2560 | * additional length field is only the upper 6 bits of the byte. | |
2561 | * The lower 2 bits are reserved. If the lower 2 bits are 0 (as | |
2562 | * all reserved fields should be), then interpreting the byte as | |
2563 | * an int will yield the length in bytes. | |
2564 | */ | |
2565 | if (srp->add_cdb_len & 0x03) { | |
2566 | dev_err(&vscsi->dev, "parse_cmd: reserved bits set in IU\n"); | |
2567 | spin_lock_bh(&vscsi->intr_lock); | |
2568 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2569 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2570 | spin_unlock_bh(&vscsi->intr_lock); | |
2571 | return; | |
2572 | } | |
2573 | ||
2574 | if (srp_get_desc_table(srp, &dir, &data_len)) { | |
2575 | dev_err(&vscsi->dev, "0x%llx: parsing SRP descriptor table failed.\n", | |
2576 | srp->tag); | |
2577 | goto fail; | |
88a678bb BL |
2578 | } |
2579 | ||
2580 | cmd->rsp.sol_not = srp->sol_not; | |
2581 | ||
2582 | switch (srp->task_attr) { | |
2583 | case SRP_SIMPLE_TASK: | |
2584 | attr = TCM_SIMPLE_TAG; | |
2585 | break; | |
2586 | case SRP_ORDERED_TASK: | |
2587 | attr = TCM_ORDERED_TAG; | |
2588 | break; | |
2589 | case SRP_HEAD_TASK: | |
2590 | attr = TCM_HEAD_TAG; | |
2591 | break; | |
2592 | case SRP_ACA_TASK: | |
2593 | attr = TCM_ACA_TAG; | |
2594 | break; | |
2595 | default: | |
2596 | dev_err(&vscsi->dev, "Invalid task attribute %d\n", | |
2597 | srp->task_attr); | |
2598 | goto fail; | |
2599 | } | |
2600 | ||
2601 | cmd->se_cmd.tag = be64_to_cpu(srp->tag); | |
2602 | ||
2603 | spin_lock_bh(&vscsi->intr_lock); | |
2604 | list_add_tail(&cmd->list, &vscsi->active_q); | |
2605 | spin_unlock_bh(&vscsi->intr_lock); | |
2606 | ||
2607 | srp->lun.scsi_lun[0] &= 0x3f; | |
2608 | ||
88a678bb BL |
2609 | rc = target_submit_cmd(&cmd->se_cmd, nexus->se_sess, srp->cdb, |
2610 | cmd->sense_buf, scsilun_to_int(&srp->lun), | |
2611 | data_len, attr, dir, 0); | |
2612 | if (rc) { | |
2613 | dev_err(&vscsi->dev, "target_submit_cmd failed, rc %d\n", rc); | |
7435b32e MC |
2614 | spin_lock_bh(&vscsi->intr_lock); |
2615 | list_del(&cmd->list); | |
2616 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2617 | spin_unlock_bh(&vscsi->intr_lock); | |
88a678bb BL |
2618 | goto fail; |
2619 | } | |
2620 | return; | |
2621 | ||
2622 | fail: | |
2623 | spin_lock_bh(&vscsi->intr_lock); | |
2624 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2625 | spin_unlock_bh(&vscsi->intr_lock); | |
2626 | } | |
2627 | ||
2628 | /** | |
2629 | * ibmvscsis_parse_task() - Parse SRP Task Management Request | |
2630 | * @vscsi: Pointer to our adapter structure | |
2631 | * @cmd: Pointer to command element with SRP task management request | |
2632 | * | |
2633 | * Parse the srp task management request; if it is valid then submit it to tcm. | |
2634 | * Note: The return code does not reflect the status of the task management | |
2635 | * request. | |
2636 | * | |
2637 | * EXECUTION ENVIRONMENT: | |
2638 | * Processor level | |
2639 | */ | |
2640 | static void ibmvscsis_parse_task(struct scsi_info *vscsi, | |
2641 | struct ibmvscsis_cmd *cmd) | |
2642 | { | |
2643 | struct iu_entry *iue = cmd->iue; | |
2644 | struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt; | |
2645 | int tcm_type; | |
2646 | u64 tag_to_abort = 0; | |
2647 | int rc = 0; | |
2648 | struct ibmvscsis_nexus *nexus; | |
2649 | ||
2650 | nexus = vscsi->tport.ibmv_nexus; | |
2651 | ||
2652 | cmd->rsp.sol_not = srp_tsk->sol_not; | |
2653 | ||
2654 | switch (srp_tsk->tsk_mgmt_func) { | |
2655 | case SRP_TSK_ABORT_TASK: | |
2656 | tcm_type = TMR_ABORT_TASK; | |
2657 | tag_to_abort = be64_to_cpu(srp_tsk->task_tag); | |
2658 | break; | |
2659 | case SRP_TSK_ABORT_TASK_SET: | |
2660 | tcm_type = TMR_ABORT_TASK_SET; | |
2661 | break; | |
2662 | case SRP_TSK_CLEAR_TASK_SET: | |
2663 | tcm_type = TMR_CLEAR_TASK_SET; | |
2664 | break; | |
2665 | case SRP_TSK_LUN_RESET: | |
2666 | tcm_type = TMR_LUN_RESET; | |
2667 | break; | |
2668 | case SRP_TSK_CLEAR_ACA: | |
2669 | tcm_type = TMR_CLEAR_ACA; | |
2670 | break; | |
2671 | default: | |
2672 | dev_err(&vscsi->dev, "unknown task mgmt func %d\n", | |
2673 | srp_tsk->tsk_mgmt_func); | |
2674 | cmd->se_cmd.se_tmr_req->response = | |
2675 | TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; | |
2676 | rc = -1; | |
2677 | break; | |
2678 | } | |
2679 | ||
2680 | if (!rc) { | |
2681 | cmd->se_cmd.tag = be64_to_cpu(srp_tsk->tag); | |
2682 | ||
2683 | spin_lock_bh(&vscsi->intr_lock); | |
2684 | list_add_tail(&cmd->list, &vscsi->active_q); | |
2685 | spin_unlock_bh(&vscsi->intr_lock); | |
2686 | ||
2687 | srp_tsk->lun.scsi_lun[0] &= 0x3f; | |
2688 | ||
2689 | pr_debug("calling submit_tmr, func %d\n", | |
2690 | srp_tsk->tsk_mgmt_func); | |
2691 | rc = target_submit_tmr(&cmd->se_cmd, nexus->se_sess, NULL, | |
2692 | scsilun_to_int(&srp_tsk->lun), srp_tsk, | |
2693 | tcm_type, GFP_KERNEL, tag_to_abort, 0); | |
2694 | if (rc) { | |
2695 | dev_err(&vscsi->dev, "target_submit_tmr failed, rc %d\n", | |
2696 | rc); | |
7435b32e MC |
2697 | spin_lock_bh(&vscsi->intr_lock); |
2698 | list_del(&cmd->list); | |
2699 | spin_unlock_bh(&vscsi->intr_lock); | |
88a678bb BL |
2700 | cmd->se_cmd.se_tmr_req->response = |
2701 | TMR_FUNCTION_REJECTED; | |
2702 | } | |
2703 | } | |
2704 | ||
2705 | if (rc) | |
2706 | transport_send_check_condition_and_sense(&cmd->se_cmd, 0, 0); | |
2707 | } | |
2708 | ||
2709 | static void ibmvscsis_scheduler(struct work_struct *work) | |
2710 | { | |
2711 | struct ibmvscsis_cmd *cmd = container_of(work, struct ibmvscsis_cmd, | |
2712 | work); | |
2713 | struct scsi_info *vscsi = cmd->adapter; | |
2714 | ||
2715 | spin_lock_bh(&vscsi->intr_lock); | |
2716 | ||
2717 | /* Remove from schedule_q */ | |
2718 | list_del(&cmd->list); | |
2719 | ||
2720 | /* Don't submit cmd if we're disconnecting */ | |
2721 | if (vscsi->flags & (SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED)) { | |
2722 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2723 | ||
2724 | /* ibmvscsis_disconnect might be waiting for us */ | |
2725 | if (list_empty(&vscsi->active_q) && | |
2726 | list_empty(&vscsi->schedule_q) && | |
2727 | (vscsi->flags & WAIT_FOR_IDLE)) { | |
2728 | vscsi->flags &= ~WAIT_FOR_IDLE; | |
2729 | complete(&vscsi->wait_idle); | |
2730 | } | |
2731 | ||
2732 | spin_unlock_bh(&vscsi->intr_lock); | |
2733 | return; | |
2734 | } | |
2735 | ||
2736 | spin_unlock_bh(&vscsi->intr_lock); | |
2737 | ||
2738 | switch (cmd->type) { | |
2739 | case SCSI_CDB: | |
2740 | ibmvscsis_parse_cmd(vscsi, cmd); | |
2741 | break; | |
2742 | case TASK_MANAGEMENT: | |
2743 | ibmvscsis_parse_task(vscsi, cmd); | |
2744 | break; | |
2745 | default: | |
2746 | dev_err(&vscsi->dev, "scheduler, invalid cmd type %d\n", | |
2747 | cmd->type); | |
2748 | spin_lock_bh(&vscsi->intr_lock); | |
2749 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2750 | spin_unlock_bh(&vscsi->intr_lock); | |
2751 | break; | |
2752 | } | |
2753 | } | |
2754 | ||
2755 | static int ibmvscsis_alloc_cmds(struct scsi_info *vscsi, int num) | |
2756 | { | |
2757 | struct ibmvscsis_cmd *cmd; | |
2758 | int i; | |
2759 | ||
2760 | INIT_LIST_HEAD(&vscsi->free_cmd); | |
2761 | vscsi->cmd_pool = kcalloc(num, sizeof(struct ibmvscsis_cmd), | |
2762 | GFP_KERNEL); | |
2763 | if (!vscsi->cmd_pool) | |
2764 | return -ENOMEM; | |
2765 | ||
2766 | for (i = 0, cmd = (struct ibmvscsis_cmd *)vscsi->cmd_pool; i < num; | |
2767 | i++, cmd++) { | |
25e78531 | 2768 | cmd->abort_cmd = NULL; |
88a678bb BL |
2769 | cmd->adapter = vscsi; |
2770 | INIT_WORK(&cmd->work, ibmvscsis_scheduler); | |
2771 | list_add_tail(&cmd->list, &vscsi->free_cmd); | |
2772 | } | |
2773 | ||
2774 | return 0; | |
2775 | } | |
2776 | ||
2777 | static void ibmvscsis_free_cmds(struct scsi_info *vscsi) | |
2778 | { | |
2779 | kfree(vscsi->cmd_pool); | |
2780 | vscsi->cmd_pool = NULL; | |
2781 | INIT_LIST_HEAD(&vscsi->free_cmd); | |
2782 | } | |
2783 | ||
2784 | /** | |
2785 | * ibmvscsis_service_wait_q() - Service Waiting Queue | |
2786 | * @timer: Pointer to timer which has expired | |
2787 | * | |
2788 | * This routine is called when the timer pops to service the waiting | |
2789 | * queue. Elements on the queue have completed, their responses have been | |
2790 | * copied to the client, but the client's response queue was full so | |
2791 | * the queue message could not be sent. The routine grabs the proper locks | |
2792 | * and calls send messages. | |
2793 | * | |
2794 | * EXECUTION ENVIRONMENT: | |
2795 | * called at interrupt level | |
2796 | */ | |
2797 | static enum hrtimer_restart ibmvscsis_service_wait_q(struct hrtimer *timer) | |
2798 | { | |
2799 | struct timer_cb *p_timer = container_of(timer, struct timer_cb, timer); | |
2800 | struct scsi_info *vscsi = container_of(p_timer, struct scsi_info, | |
2801 | rsp_q_timer); | |
2802 | ||
2803 | spin_lock_bh(&vscsi->intr_lock); | |
2804 | p_timer->timer_pops += 1; | |
2805 | p_timer->started = false; | |
2806 | ibmvscsis_send_messages(vscsi); | |
2807 | spin_unlock_bh(&vscsi->intr_lock); | |
2808 | ||
2809 | return HRTIMER_NORESTART; | |
2810 | } | |
2811 | ||
2812 | static long ibmvscsis_alloctimer(struct scsi_info *vscsi) | |
2813 | { | |
2814 | struct timer_cb *p_timer; | |
2815 | ||
2816 | p_timer = &vscsi->rsp_q_timer; | |
2817 | hrtimer_init(&p_timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
2818 | ||
2819 | p_timer->timer.function = ibmvscsis_service_wait_q; | |
2820 | p_timer->started = false; | |
2821 | p_timer->timer_pops = 0; | |
2822 | ||
2823 | return ADAPT_SUCCESS; | |
2824 | } | |
2825 | ||
2826 | static void ibmvscsis_freetimer(struct scsi_info *vscsi) | |
2827 | { | |
2828 | struct timer_cb *p_timer; | |
2829 | ||
2830 | p_timer = &vscsi->rsp_q_timer; | |
2831 | ||
2832 | (void)hrtimer_cancel(&p_timer->timer); | |
2833 | ||
2834 | p_timer->started = false; | |
2835 | p_timer->timer_pops = 0; | |
2836 | } | |
2837 | ||
2838 | static irqreturn_t ibmvscsis_interrupt(int dummy, void *data) | |
2839 | { | |
2840 | struct scsi_info *vscsi = data; | |
2841 | ||
2842 | vio_disable_interrupts(vscsi->dma_dev); | |
2843 | tasklet_schedule(&vscsi->work_task); | |
2844 | ||
2845 | return IRQ_HANDLED; | |
2846 | } | |
2847 | ||
88a678bb BL |
2848 | /** |
2849 | * ibmvscsis_enable_change_state() - Set new state based on enabled status | |
2850 | * @vscsi: Pointer to our adapter structure | |
2851 | * | |
2852 | * This function determines our new state now that we are enabled. This | |
2853 | * may involve sending an Init Complete message to the client. | |
2854 | * | |
2855 | * Must be called with interrupt lock held. | |
2856 | */ | |
2857 | static long ibmvscsis_enable_change_state(struct scsi_info *vscsi) | |
2858 | { | |
c9b3379f | 2859 | int bytes; |
88a678bb BL |
2860 | long rc = ADAPT_SUCCESS; |
2861 | ||
c9b3379f MC |
2862 | bytes = vscsi->cmd_q.size * PAGE_SIZE; |
2863 | rc = h_reg_crq(vscsi->dds.unit_id, vscsi->cmd_q.crq_token, bytes); | |
2864 | if (rc == H_CLOSED || rc == H_SUCCESS) { | |
2865 | vscsi->state = WAIT_CONNECTION; | |
2866 | rc = ibmvscsis_establish_new_q(vscsi); | |
2867 | } | |
88a678bb | 2868 | |
c9b3379f MC |
2869 | if (rc != ADAPT_SUCCESS) { |
2870 | vscsi->state = ERR_DISCONNECTED; | |
2871 | vscsi->flags |= RESPONSE_Q_DOWN; | |
88a678bb BL |
2872 | } |
2873 | ||
2874 | return rc; | |
2875 | } | |
2876 | ||
2877 | /** | |
2878 | * ibmvscsis_create_command_q() - Create Command Queue | |
2879 | * @vscsi: Pointer to our adapter structure | |
2880 | * @num_cmds: Currently unused. In the future, may be used to determine | |
2881 | * the size of the CRQ. | |
2882 | * | |
2883 | * Allocates memory for command queue maps remote memory into an ioba | |
2884 | * initializes the command response queue | |
2885 | * | |
2886 | * EXECUTION ENVIRONMENT: | |
2887 | * Process level only | |
2888 | */ | |
2889 | static long ibmvscsis_create_command_q(struct scsi_info *vscsi, int num_cmds) | |
2890 | { | |
88a678bb BL |
2891 | int pages; |
2892 | struct vio_dev *vdev = vscsi->dma_dev; | |
2893 | ||
2894 | /* We might support multiple pages in the future, but just 1 for now */ | |
2895 | pages = 1; | |
2896 | ||
2897 | vscsi->cmd_q.size = pages; | |
2898 | ||
2899 | vscsi->cmd_q.base_addr = | |
2900 | (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); | |
2901 | if (!vscsi->cmd_q.base_addr) | |
2902 | return -ENOMEM; | |
2903 | ||
2904 | vscsi->cmd_q.mask = ((uint)pages * CRQ_PER_PAGE) - 1; | |
2905 | ||
2906 | vscsi->cmd_q.crq_token = dma_map_single(&vdev->dev, | |
2907 | vscsi->cmd_q.base_addr, | |
2908 | PAGE_SIZE, DMA_BIDIRECTIONAL); | |
2909 | if (dma_mapping_error(&vdev->dev, vscsi->cmd_q.crq_token)) { | |
2910 | free_page((unsigned long)vscsi->cmd_q.base_addr); | |
2911 | return -ENOMEM; | |
2912 | } | |
2913 | ||
c9b3379f | 2914 | return 0; |
88a678bb BL |
2915 | } |
2916 | ||
2917 | /** | |
2918 | * ibmvscsis_destroy_command_q - Destroy Command Queue | |
2919 | * @vscsi: Pointer to our adapter structure | |
2920 | * | |
2921 | * Releases memory for command queue and unmaps mapped remote memory. | |
2922 | * | |
2923 | * EXECUTION ENVIRONMENT: | |
2924 | * Process level only | |
2925 | */ | |
2926 | static void ibmvscsis_destroy_command_q(struct scsi_info *vscsi) | |
2927 | { | |
2928 | dma_unmap_single(&vscsi->dma_dev->dev, vscsi->cmd_q.crq_token, | |
2929 | PAGE_SIZE, DMA_BIDIRECTIONAL); | |
2930 | free_page((unsigned long)vscsi->cmd_q.base_addr); | |
2931 | vscsi->cmd_q.base_addr = NULL; | |
2932 | vscsi->state = NO_QUEUE; | |
2933 | } | |
2934 | ||
2935 | static u8 ibmvscsis_fast_fail(struct scsi_info *vscsi, | |
2936 | struct ibmvscsis_cmd *cmd) | |
2937 | { | |
2938 | struct iu_entry *iue = cmd->iue; | |
2939 | struct se_cmd *se_cmd = &cmd->se_cmd; | |
2940 | struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf; | |
2941 | struct scsi_sense_hdr sshdr; | |
2942 | u8 rc = se_cmd->scsi_status; | |
2943 | ||
2944 | if (vscsi->fast_fail && (READ_CMD(srp->cdb) || WRITE_CMD(srp->cdb))) | |
2945 | if (scsi_normalize_sense(se_cmd->sense_buffer, | |
2946 | se_cmd->scsi_sense_length, &sshdr)) | |
2947 | if (sshdr.sense_key == HARDWARE_ERROR && | |
2948 | (se_cmd->residual_count == 0 || | |
2949 | se_cmd->residual_count == se_cmd->data_length)) { | |
2950 | rc = NO_SENSE; | |
2951 | cmd->flags |= CMD_FAST_FAIL; | |
2952 | } | |
2953 | ||
2954 | return rc; | |
2955 | } | |
2956 | ||
2957 | /** | |
2958 | * srp_build_response() - Build an SRP response buffer | |
2959 | * @vscsi: Pointer to our adapter structure | |
2960 | * @cmd: Pointer to command for which to send the response | |
2961 | * @len_p: Where to return the length of the IU response sent. This | |
2962 | * is needed to construct the CRQ response. | |
2963 | * | |
2964 | * Build the SRP response buffer and copy it to the client's memory space. | |
2965 | */ | |
2966 | static long srp_build_response(struct scsi_info *vscsi, | |
2967 | struct ibmvscsis_cmd *cmd, uint *len_p) | |
2968 | { | |
2969 | struct iu_entry *iue = cmd->iue; | |
2970 | struct se_cmd *se_cmd = &cmd->se_cmd; | |
2971 | struct srp_rsp *rsp; | |
2972 | uint len; | |
2973 | u32 rsp_code; | |
2974 | char *data; | |
2975 | u32 *tsk_status; | |
2976 | long rc = ADAPT_SUCCESS; | |
2977 | ||
2978 | spin_lock_bh(&vscsi->intr_lock); | |
2979 | ||
2980 | rsp = &vio_iu(iue)->srp.rsp; | |
2981 | len = sizeof(*rsp); | |
2982 | memset(rsp, 0, len); | |
2983 | data = rsp->data; | |
2984 | ||
2985 | rsp->opcode = SRP_RSP; | |
2986 | ||
75dbf2d3 | 2987 | rsp->req_lim_delta = cpu_to_be32(1 + vscsi->credit); |
88a678bb BL |
2988 | rsp->tag = cmd->rsp.tag; |
2989 | rsp->flags = 0; | |
2990 | ||
2991 | if (cmd->type == SCSI_CDB) { | |
2992 | rsp->status = ibmvscsis_fast_fail(vscsi, cmd); | |
2993 | if (rsp->status) { | |
2994 | pr_debug("build_resp: cmd %p, scsi status %d\n", cmd, | |
2995 | (int)rsp->status); | |
2996 | ibmvscsis_determine_resid(se_cmd, rsp); | |
2997 | if (se_cmd->scsi_sense_length && se_cmd->sense_buffer) { | |
2998 | rsp->sense_data_len = | |
2999 | cpu_to_be32(se_cmd->scsi_sense_length); | |
3000 | rsp->flags |= SRP_RSP_FLAG_SNSVALID; | |
3001 | len += se_cmd->scsi_sense_length; | |
3002 | memcpy(data, se_cmd->sense_buffer, | |
3003 | se_cmd->scsi_sense_length); | |
3004 | } | |
3005 | rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> | |
3006 | UCSOLNT_RESP_SHIFT; | |
3007 | } else if (cmd->flags & CMD_FAST_FAIL) { | |
3008 | pr_debug("build_resp: cmd %p, fast fail\n", cmd); | |
3009 | rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> | |
3010 | UCSOLNT_RESP_SHIFT; | |
3011 | } else { | |
3012 | rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >> | |
3013 | SCSOLNT_RESP_SHIFT; | |
3014 | } | |
3015 | } else { | |
3016 | /* this is task management */ | |
3017 | rsp->status = 0; | |
3018 | rsp->resp_data_len = cpu_to_be32(4); | |
3019 | rsp->flags |= SRP_RSP_FLAG_RSPVALID; | |
3020 | ||
3021 | switch (se_cmd->se_tmr_req->response) { | |
3022 | case TMR_FUNCTION_COMPLETE: | |
3023 | case TMR_TASK_DOES_NOT_EXIST: | |
3024 | rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_COMPLETE; | |
3025 | rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >> | |
3026 | SCSOLNT_RESP_SHIFT; | |
3027 | break; | |
3028 | case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: | |
3029 | case TMR_LUN_DOES_NOT_EXIST: | |
3030 | rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_NOT_SUPPORTED; | |
3031 | rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> | |
3032 | UCSOLNT_RESP_SHIFT; | |
3033 | break; | |
3034 | case TMR_FUNCTION_FAILED: | |
3035 | case TMR_FUNCTION_REJECTED: | |
3036 | default: | |
3037 | rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_FAILED; | |
3038 | rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> | |
3039 | UCSOLNT_RESP_SHIFT; | |
3040 | break; | |
3041 | } | |
3042 | ||
3043 | tsk_status = (u32 *)data; | |
3044 | *tsk_status = cpu_to_be32(rsp_code); | |
3045 | data = (char *)(tsk_status + 1); | |
3046 | len += 4; | |
3047 | } | |
3048 | ||
3049 | dma_wmb(); | |
3050 | rc = h_copy_rdma(len, vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma, | |
3051 | vscsi->dds.window[REMOTE].liobn, | |
3052 | be64_to_cpu(iue->remote_token)); | |
3053 | ||
3054 | switch (rc) { | |
3055 | case H_SUCCESS: | |
3056 | vscsi->credit = 0; | |
3057 | *len_p = len; | |
3058 | break; | |
3059 | case H_PERMISSION: | |
3060 | if (connection_broken(vscsi)) | |
3061 | vscsi->flags |= RESPONSE_Q_DOWN | CLIENT_FAILED; | |
3062 | ||
3063 | dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld, flags 0x%x, state 0x%hx\n", | |
3064 | rc, vscsi->flags, vscsi->state); | |
3065 | break; | |
3066 | case H_SOURCE_PARM: | |
3067 | case H_DEST_PARM: | |
3068 | default: | |
3069 | dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld\n", | |
3070 | rc); | |
3071 | break; | |
3072 | } | |
3073 | ||
3074 | spin_unlock_bh(&vscsi->intr_lock); | |
3075 | ||
3076 | return rc; | |
3077 | } | |
3078 | ||
3079 | static int ibmvscsis_rdma(struct ibmvscsis_cmd *cmd, struct scatterlist *sg, | |
3080 | int nsg, struct srp_direct_buf *md, int nmd, | |
3081 | enum dma_data_direction dir, unsigned int bytes) | |
3082 | { | |
3083 | struct iu_entry *iue = cmd->iue; | |
3084 | struct srp_target *target = iue->target; | |
3085 | struct scsi_info *vscsi = target->ldata; | |
3086 | struct scatterlist *sgp; | |
3087 | dma_addr_t client_ioba, server_ioba; | |
3088 | ulong buf_len; | |
3089 | ulong client_len, server_len; | |
3090 | int md_idx; | |
3091 | long tx_len; | |
3092 | long rc = 0; | |
3093 | ||
88a678bb BL |
3094 | if (bytes == 0) |
3095 | return 0; | |
3096 | ||
3097 | sgp = sg; | |
3098 | client_len = 0; | |
3099 | server_len = 0; | |
3100 | md_idx = 0; | |
3101 | tx_len = bytes; | |
3102 | ||
3103 | do { | |
3104 | if (client_len == 0) { | |
3105 | if (md_idx >= nmd) { | |
3106 | dev_err(&vscsi->dev, "rdma: ran out of client memory descriptors\n"); | |
3107 | rc = -EIO; | |
3108 | break; | |
3109 | } | |
3110 | client_ioba = be64_to_cpu(md[md_idx].va); | |
3111 | client_len = be32_to_cpu(md[md_idx].len); | |
3112 | } | |
3113 | if (server_len == 0) { | |
3114 | if (!sgp) { | |
3115 | dev_err(&vscsi->dev, "rdma: ran out of scatter/gather list\n"); | |
3116 | rc = -EIO; | |
3117 | break; | |
3118 | } | |
3119 | server_ioba = sg_dma_address(sgp); | |
3120 | server_len = sg_dma_len(sgp); | |
3121 | } | |
3122 | ||
3123 | buf_len = tx_len; | |
3124 | ||
3125 | if (buf_len > client_len) | |
3126 | buf_len = client_len; | |
3127 | ||
3128 | if (buf_len > server_len) | |
3129 | buf_len = server_len; | |
3130 | ||
3131 | if (buf_len > max_vdma_size) | |
3132 | buf_len = max_vdma_size; | |
3133 | ||
3134 | if (dir == DMA_TO_DEVICE) { | |
3135 | /* read from client */ | |
3136 | rc = h_copy_rdma(buf_len, | |
3137 | vscsi->dds.window[REMOTE].liobn, | |
3138 | client_ioba, | |
3139 | vscsi->dds.window[LOCAL].liobn, | |
3140 | server_ioba); | |
3141 | } else { | |
88a678bb BL |
3142 | /* The h_copy_rdma will cause phyp, running in another |
3143 | * partition, to read memory, so we need to make sure | |
3144 | * the data has been written out, hence these syncs. | |
3145 | */ | |
3146 | /* ensure that everything is in memory */ | |
3147 | isync(); | |
3148 | /* ensure that memory has been made visible */ | |
3149 | dma_wmb(); | |
3150 | rc = h_copy_rdma(buf_len, | |
3151 | vscsi->dds.window[LOCAL].liobn, | |
3152 | server_ioba, | |
3153 | vscsi->dds.window[REMOTE].liobn, | |
3154 | client_ioba); | |
3155 | } | |
3156 | switch (rc) { | |
3157 | case H_SUCCESS: | |
3158 | break; | |
3159 | case H_PERMISSION: | |
3160 | case H_SOURCE_PARM: | |
3161 | case H_DEST_PARM: | |
3162 | if (connection_broken(vscsi)) { | |
3163 | spin_lock_bh(&vscsi->intr_lock); | |
3164 | vscsi->flags |= | |
3165 | (RESPONSE_Q_DOWN | CLIENT_FAILED); | |
3166 | spin_unlock_bh(&vscsi->intr_lock); | |
3167 | } | |
3168 | dev_err(&vscsi->dev, "rdma: h_copy_rdma failed, rc %ld\n", | |
3169 | rc); | |
3170 | break; | |
3171 | ||
3172 | default: | |
3173 | dev_err(&vscsi->dev, "rdma: unknown error %ld from h_copy_rdma\n", | |
3174 | rc); | |
3175 | break; | |
3176 | } | |
3177 | ||
3178 | if (!rc) { | |
3179 | tx_len -= buf_len; | |
3180 | if (tx_len) { | |
3181 | client_len -= buf_len; | |
3182 | if (client_len == 0) | |
3183 | md_idx++; | |
3184 | else | |
3185 | client_ioba += buf_len; | |
3186 | ||
3187 | server_len -= buf_len; | |
3188 | if (server_len == 0) | |
3189 | sgp = sg_next(sgp); | |
3190 | else | |
3191 | server_ioba += buf_len; | |
3192 | } else { | |
3193 | break; | |
3194 | } | |
3195 | } | |
3196 | } while (!rc); | |
3197 | ||
3198 | return rc; | |
3199 | } | |
3200 | ||
3201 | /** | |
3202 | * ibmvscsis_handle_crq() - Handle CRQ | |
3203 | * @data: Pointer to our adapter structure | |
3204 | * | |
3205 | * Read the command elements from the command queue and copy the payloads | |
3206 | * associated with the command elements to local memory and execute the | |
3207 | * SRP requests. | |
3208 | * | |
3209 | * Note: this is an edge triggered interrupt. It can not be shared. | |
3210 | */ | |
3211 | static void ibmvscsis_handle_crq(unsigned long data) | |
3212 | { | |
3213 | struct scsi_info *vscsi = (struct scsi_info *)data; | |
3214 | struct viosrp_crq *crq; | |
3215 | long rc; | |
3216 | bool ack = true; | |
3217 | volatile u8 valid; | |
3218 | ||
3219 | spin_lock_bh(&vscsi->intr_lock); | |
3220 | ||
3221 | pr_debug("got interrupt\n"); | |
3222 | ||
3223 | /* | |
3224 | * if we are in a path where we are waiting for all pending commands | |
3225 | * to complete because we received a transport event and anything in | |
79fac9c9 | 3226 | * the command queue is for a new connection, do nothing |
88a678bb BL |
3227 | */ |
3228 | if (TARGET_STOP(vscsi)) { | |
3229 | vio_enable_interrupts(vscsi->dma_dev); | |
3230 | ||
3231 | pr_debug("handle_crq, don't process: flags 0x%x, state 0x%hx\n", | |
3232 | vscsi->flags, vscsi->state); | |
3233 | spin_unlock_bh(&vscsi->intr_lock); | |
3234 | return; | |
3235 | } | |
3236 | ||
3237 | rc = vscsi->flags & SCHEDULE_DISCONNECT; | |
3238 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
3239 | valid = crq->valid; | |
3240 | dma_rmb(); | |
3241 | ||
3242 | while (valid) { | |
3243 | /* | |
3244 | * These are edege triggered interrupts. After dropping out of | |
3245 | * the while loop, the code must check for work since an | |
3246 | * interrupt could be lost, and an elment be left on the queue, | |
3247 | * hence the label. | |
3248 | */ | |
3249 | cmd_work: | |
3250 | vscsi->cmd_q.index = | |
3251 | (vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask; | |
3252 | ||
3253 | if (!rc) { | |
3254 | rc = ibmvscsis_parse_command(vscsi, crq); | |
3255 | } else { | |
3256 | if ((uint)crq->valid == VALID_TRANS_EVENT) { | |
3257 | /* | |
3258 | * must service the transport layer events even | |
3259 | * in an error state, dont break out until all | |
3260 | * the consecutive transport events have been | |
3261 | * processed | |
3262 | */ | |
3263 | rc = ibmvscsis_trans_event(vscsi, crq); | |
3264 | } else if (vscsi->flags & TRANS_EVENT) { | |
3265 | /* | |
81290215 | 3266 | * if a transport event has occurred leave |
88a678bb | 3267 | * everything but transport events on the queue |
81290215 | 3268 | * |
88a678bb | 3269 | * need to decrement the queue index so we can |
79fac9c9 | 3270 | * look at the element again |
88a678bb BL |
3271 | */ |
3272 | if (vscsi->cmd_q.index) | |
3273 | vscsi->cmd_q.index -= 1; | |
3274 | else | |
3275 | /* | |
3276 | * index is at 0 it just wrapped. | |
3277 | * have it index last element in q | |
3278 | */ | |
3279 | vscsi->cmd_q.index = vscsi->cmd_q.mask; | |
3280 | break; | |
3281 | } | |
3282 | } | |
3283 | ||
3284 | crq->valid = INVALIDATE_CMD_RESP_EL; | |
3285 | ||
3286 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
3287 | valid = crq->valid; | |
3288 | dma_rmb(); | |
3289 | } | |
3290 | ||
3291 | if (!rc) { | |
3292 | if (ack) { | |
3293 | vio_enable_interrupts(vscsi->dma_dev); | |
3294 | ack = false; | |
3295 | pr_debug("handle_crq, reenabling interrupts\n"); | |
3296 | } | |
3297 | valid = crq->valid; | |
3298 | dma_rmb(); | |
3299 | if (valid) | |
3300 | goto cmd_work; | |
3301 | } else { | |
3302 | pr_debug("handle_crq, error: flags 0x%x, state 0x%hx, crq index 0x%x\n", | |
3303 | vscsi->flags, vscsi->state, vscsi->cmd_q.index); | |
3304 | } | |
3305 | ||
3306 | pr_debug("Leaving handle_crq: schedule_q empty %d, flags 0x%x, state 0x%hx\n", | |
3307 | (int)list_empty(&vscsi->schedule_q), vscsi->flags, | |
3308 | vscsi->state); | |
3309 | ||
3310 | spin_unlock_bh(&vscsi->intr_lock); | |
3311 | } | |
3312 | ||
3313 | static int ibmvscsis_probe(struct vio_dev *vdev, | |
3314 | const struct vio_device_id *id) | |
3315 | { | |
3316 | struct scsi_info *vscsi; | |
3317 | int rc = 0; | |
3318 | long hrc = 0; | |
3319 | char wq_name[24]; | |
3320 | ||
3321 | vscsi = kzalloc(sizeof(*vscsi), GFP_KERNEL); | |
3322 | if (!vscsi) { | |
3323 | rc = -ENOMEM; | |
3324 | pr_err("probe: allocation of adapter failed\n"); | |
3325 | return rc; | |
3326 | } | |
3327 | ||
3328 | vscsi->dma_dev = vdev; | |
3329 | vscsi->dev = vdev->dev; | |
3330 | INIT_LIST_HEAD(&vscsi->schedule_q); | |
3331 | INIT_LIST_HEAD(&vscsi->waiting_rsp); | |
3332 | INIT_LIST_HEAD(&vscsi->active_q); | |
3333 | ||
11950d70 MC |
3334 | snprintf(vscsi->tport.tport_name, IBMVSCSIS_NAMELEN, "%s", |
3335 | dev_name(&vdev->dev)); | |
88a678bb BL |
3336 | |
3337 | pr_debug("probe tport_name: %s\n", vscsi->tport.tport_name); | |
3338 | ||
3339 | rc = read_dma_window(vscsi); | |
3340 | if (rc) | |
3341 | goto free_adapter; | |
3342 | pr_debug("Probe: liobn 0x%x, riobn 0x%x\n", | |
3343 | vscsi->dds.window[LOCAL].liobn, | |
3344 | vscsi->dds.window[REMOTE].liobn); | |
3345 | ||
3346 | strcpy(vscsi->eye, "VSCSI "); | |
3347 | strncat(vscsi->eye, vdev->name, MAX_EYE); | |
3348 | ||
3349 | vscsi->dds.unit_id = vdev->unit_address; | |
9c93cf03 MC |
3350 | strncpy(vscsi->dds.partition_name, partition_name, |
3351 | sizeof(vscsi->dds.partition_name)); | |
3352 | vscsi->dds.partition_num = partition_number; | |
88a678bb BL |
3353 | |
3354 | spin_lock_bh(&ibmvscsis_dev_lock); | |
3355 | list_add_tail(&vscsi->list, &ibmvscsis_dev_list); | |
3356 | spin_unlock_bh(&ibmvscsis_dev_lock); | |
3357 | ||
3358 | /* | |
3359 | * TBD: How do we determine # of cmds to request? Do we know how | |
3360 | * many "children" we have? | |
3361 | */ | |
3362 | vscsi->request_limit = INITIAL_SRP_LIMIT; | |
3363 | rc = srp_target_alloc(&vscsi->target, &vdev->dev, vscsi->request_limit, | |
3364 | SRP_MAX_IU_LEN); | |
3365 | if (rc) | |
3366 | goto rem_list; | |
3367 | ||
3368 | vscsi->target.ldata = vscsi; | |
3369 | ||
3370 | rc = ibmvscsis_alloc_cmds(vscsi, vscsi->request_limit); | |
3371 | if (rc) { | |
3372 | dev_err(&vscsi->dev, "alloc_cmds failed, rc %d, num %d\n", | |
3373 | rc, vscsi->request_limit); | |
3374 | goto free_target; | |
3375 | } | |
3376 | ||
3377 | /* | |
3378 | * Note: the lock is used in freeing timers, so must initialize | |
3379 | * first so that ordering in case of error is correct. | |
3380 | */ | |
3381 | spin_lock_init(&vscsi->intr_lock); | |
3382 | ||
3383 | rc = ibmvscsis_alloctimer(vscsi); | |
3384 | if (rc) { | |
3385 | dev_err(&vscsi->dev, "probe: alloctimer failed, rc %d\n", rc); | |
3386 | goto free_cmds; | |
3387 | } | |
3388 | ||
3389 | rc = ibmvscsis_create_command_q(vscsi, 256); | |
3390 | if (rc) { | |
3391 | dev_err(&vscsi->dev, "probe: create_command_q failed, rc %d\n", | |
3392 | rc); | |
3393 | goto free_timer; | |
3394 | } | |
3395 | ||
3396 | vscsi->map_buf = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
3397 | if (!vscsi->map_buf) { | |
3398 | rc = -ENOMEM; | |
3399 | dev_err(&vscsi->dev, "probe: allocating cmd buffer failed\n"); | |
3400 | goto destroy_queue; | |
3401 | } | |
3402 | ||
3403 | vscsi->map_ioba = dma_map_single(&vdev->dev, vscsi->map_buf, PAGE_SIZE, | |
3404 | DMA_BIDIRECTIONAL); | |
3405 | if (dma_mapping_error(&vdev->dev, vscsi->map_ioba)) { | |
38247feb | 3406 | rc = -ENOMEM; |
88a678bb BL |
3407 | dev_err(&vscsi->dev, "probe: error mapping command buffer\n"); |
3408 | goto free_buf; | |
3409 | } | |
3410 | ||
3411 | hrc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO, | |
3412 | (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0, | |
3413 | 0); | |
3414 | if (hrc == H_SUCCESS) | |
3415 | vscsi->client_data.partition_number = | |
3416 | be64_to_cpu(*(u64 *)vscsi->map_buf); | |
3417 | /* | |
3418 | * We expect the VIOCTL to fail if we're configured as "any | |
3419 | * client can connect" and the client isn't activated yet. | |
3420 | * We'll make the call again when he sends an init msg. | |
3421 | */ | |
3422 | pr_debug("probe hrc %ld, client partition num %d\n", | |
3423 | hrc, vscsi->client_data.partition_number); | |
3424 | ||
3425 | tasklet_init(&vscsi->work_task, ibmvscsis_handle_crq, | |
3426 | (unsigned long)vscsi); | |
3427 | ||
3428 | init_completion(&vscsi->wait_idle); | |
8bf11557 | 3429 | init_completion(&vscsi->unconfig); |
88a678bb BL |
3430 | |
3431 | snprintf(wq_name, 24, "ibmvscsis%s", dev_name(&vdev->dev)); | |
3432 | vscsi->work_q = create_workqueue(wq_name); | |
3433 | if (!vscsi->work_q) { | |
3434 | rc = -ENOMEM; | |
3435 | dev_err(&vscsi->dev, "create_workqueue failed\n"); | |
3436 | goto unmap_buf; | |
3437 | } | |
3438 | ||
3439 | rc = request_irq(vdev->irq, ibmvscsis_interrupt, 0, "ibmvscsis", vscsi); | |
3440 | if (rc) { | |
3441 | rc = -EPERM; | |
3442 | dev_err(&vscsi->dev, "probe: request_irq failed, rc %d\n", rc); | |
3443 | goto destroy_WQ; | |
3444 | } | |
3445 | ||
c9b3379f | 3446 | vscsi->state = WAIT_ENABLED; |
88a678bb BL |
3447 | |
3448 | dev_set_drvdata(&vdev->dev, vscsi); | |
3449 | ||
3450 | return 0; | |
3451 | ||
88a678bb BL |
3452 | destroy_WQ: |
3453 | destroy_workqueue(vscsi->work_q); | |
3454 | unmap_buf: | |
3455 | dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE, | |
3456 | DMA_BIDIRECTIONAL); | |
3457 | free_buf: | |
3458 | kfree(vscsi->map_buf); | |
3459 | destroy_queue: | |
3460 | tasklet_kill(&vscsi->work_task); | |
3461 | ibmvscsis_unregister_command_q(vscsi); | |
3462 | ibmvscsis_destroy_command_q(vscsi); | |
3463 | free_timer: | |
3464 | ibmvscsis_freetimer(vscsi); | |
3465 | free_cmds: | |
3466 | ibmvscsis_free_cmds(vscsi); | |
3467 | free_target: | |
3468 | srp_target_free(&vscsi->target); | |
3469 | rem_list: | |
3470 | spin_lock_bh(&ibmvscsis_dev_lock); | |
3471 | list_del(&vscsi->list); | |
3472 | spin_unlock_bh(&ibmvscsis_dev_lock); | |
3473 | free_adapter: | |
3474 | kfree(vscsi); | |
3475 | ||
3476 | return rc; | |
3477 | } | |
3478 | ||
3479 | static int ibmvscsis_remove(struct vio_dev *vdev) | |
3480 | { | |
3481 | struct scsi_info *vscsi = dev_get_drvdata(&vdev->dev); | |
3482 | ||
3483 | pr_debug("remove (%s)\n", dev_name(&vscsi->dma_dev->dev)); | |
3484 | ||
8bf11557 MC |
3485 | spin_lock_bh(&vscsi->intr_lock); |
3486 | ibmvscsis_post_disconnect(vscsi, UNCONFIGURING, 0); | |
3487 | vscsi->flags |= CFG_SLEEPING; | |
3488 | spin_unlock_bh(&vscsi->intr_lock); | |
3489 | wait_for_completion(&vscsi->unconfig); | |
88a678bb BL |
3490 | |
3491 | vio_disable_interrupts(vdev); | |
3492 | free_irq(vdev->irq, vscsi); | |
3493 | destroy_workqueue(vscsi->work_q); | |
3494 | dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE, | |
3495 | DMA_BIDIRECTIONAL); | |
3496 | kfree(vscsi->map_buf); | |
3497 | tasklet_kill(&vscsi->work_task); | |
88a678bb BL |
3498 | ibmvscsis_destroy_command_q(vscsi); |
3499 | ibmvscsis_freetimer(vscsi); | |
3500 | ibmvscsis_free_cmds(vscsi); | |
3501 | srp_target_free(&vscsi->target); | |
3502 | spin_lock_bh(&ibmvscsis_dev_lock); | |
3503 | list_del(&vscsi->list); | |
3504 | spin_unlock_bh(&ibmvscsis_dev_lock); | |
3505 | kfree(vscsi); | |
3506 | ||
3507 | return 0; | |
3508 | } | |
3509 | ||
3510 | static ssize_t system_id_show(struct device *dev, | |
3511 | struct device_attribute *attr, char *buf) | |
3512 | { | |
3513 | return snprintf(buf, PAGE_SIZE, "%s\n", system_id); | |
3514 | } | |
3515 | ||
3516 | static ssize_t partition_number_show(struct device *dev, | |
3517 | struct device_attribute *attr, char *buf) | |
3518 | { | |
3519 | return snprintf(buf, PAGE_SIZE, "%x\n", partition_number); | |
3520 | } | |
3521 | ||
3522 | static ssize_t unit_address_show(struct device *dev, | |
3523 | struct device_attribute *attr, char *buf) | |
3524 | { | |
3525 | struct scsi_info *vscsi = container_of(dev, struct scsi_info, dev); | |
3526 | ||
3527 | return snprintf(buf, PAGE_SIZE, "%x\n", vscsi->dma_dev->unit_address); | |
3528 | } | |
3529 | ||
3530 | static int ibmvscsis_get_system_info(void) | |
3531 | { | |
3532 | struct device_node *rootdn, *vdevdn; | |
3533 | const char *id, *model, *name; | |
3534 | const uint *num; | |
3535 | ||
3536 | rootdn = of_find_node_by_path("/"); | |
3537 | if (!rootdn) | |
3538 | return -ENOENT; | |
3539 | ||
3540 | model = of_get_property(rootdn, "model", NULL); | |
3541 | id = of_get_property(rootdn, "system-id", NULL); | |
3542 | if (model && id) | |
3543 | snprintf(system_id, sizeof(system_id), "%s-%s", model, id); | |
3544 | ||
3545 | name = of_get_property(rootdn, "ibm,partition-name", NULL); | |
3546 | if (name) | |
3547 | strncpy(partition_name, name, sizeof(partition_name)); | |
3548 | ||
3549 | num = of_get_property(rootdn, "ibm,partition-no", NULL); | |
3550 | if (num) | |
9c93cf03 | 3551 | partition_number = of_read_number(num, 1); |
88a678bb BL |
3552 | |
3553 | of_node_put(rootdn); | |
3554 | ||
3555 | vdevdn = of_find_node_by_path("/vdevice"); | |
3556 | if (vdevdn) { | |
3557 | const uint *mvds; | |
3558 | ||
3559 | mvds = of_get_property(vdevdn, "ibm,max-virtual-dma-size", | |
3560 | NULL); | |
3561 | if (mvds) | |
3562 | max_vdma_size = *mvds; | |
3563 | of_node_put(vdevdn); | |
3564 | } | |
3565 | ||
3566 | return 0; | |
3567 | } | |
3568 | ||
3569 | static char *ibmvscsis_get_fabric_name(void) | |
3570 | { | |
3571 | return "ibmvscsis"; | |
3572 | } | |
3573 | ||
3574 | static char *ibmvscsis_get_fabric_wwn(struct se_portal_group *se_tpg) | |
3575 | { | |
3576 | struct ibmvscsis_tport *tport = | |
3577 | container_of(se_tpg, struct ibmvscsis_tport, se_tpg); | |
3578 | ||
3579 | return tport->tport_name; | |
3580 | } | |
3581 | ||
3582 | static u16 ibmvscsis_get_tag(struct se_portal_group *se_tpg) | |
3583 | { | |
3584 | struct ibmvscsis_tport *tport = | |
3585 | container_of(se_tpg, struct ibmvscsis_tport, se_tpg); | |
3586 | ||
3587 | return tport->tport_tpgt; | |
3588 | } | |
3589 | ||
3590 | static u32 ibmvscsis_get_default_depth(struct se_portal_group *se_tpg) | |
3591 | { | |
3592 | return 1; | |
3593 | } | |
3594 | ||
3595 | static int ibmvscsis_check_true(struct se_portal_group *se_tpg) | |
3596 | { | |
3597 | return 1; | |
3598 | } | |
3599 | ||
3600 | static int ibmvscsis_check_false(struct se_portal_group *se_tpg) | |
3601 | { | |
3602 | return 0; | |
3603 | } | |
3604 | ||
3605 | static u32 ibmvscsis_tpg_get_inst_index(struct se_portal_group *se_tpg) | |
3606 | { | |
3607 | return 1; | |
3608 | } | |
3609 | ||
3610 | static int ibmvscsis_check_stop_free(struct se_cmd *se_cmd) | |
3611 | { | |
3612 | return target_put_sess_cmd(se_cmd); | |
3613 | } | |
3614 | ||
3615 | static void ibmvscsis_release_cmd(struct se_cmd *se_cmd) | |
3616 | { | |
3617 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3618 | se_cmd); | |
3619 | struct scsi_info *vscsi = cmd->adapter; | |
3620 | ||
88a678bb BL |
3621 | spin_lock_bh(&vscsi->intr_lock); |
3622 | /* Remove from active_q */ | |
980b3271 | 3623 | list_move_tail(&cmd->list, &vscsi->waiting_rsp); |
88a678bb BL |
3624 | ibmvscsis_send_messages(vscsi); |
3625 | spin_unlock_bh(&vscsi->intr_lock); | |
3626 | } | |
3627 | ||
3628 | static u32 ibmvscsis_sess_get_index(struct se_session *se_sess) | |
3629 | { | |
3630 | return 0; | |
3631 | } | |
3632 | ||
3633 | static int ibmvscsis_write_pending(struct se_cmd *se_cmd) | |
3634 | { | |
3635 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3636 | se_cmd); | |
25e78531 | 3637 | struct scsi_info *vscsi = cmd->adapter; |
88a678bb BL |
3638 | struct iu_entry *iue = cmd->iue; |
3639 | int rc; | |
3640 | ||
25e78531 BL |
3641 | /* |
3642 | * If CLIENT_FAILED OR RESPONSE_Q_DOWN, then just return success | |
3643 | * since LIO can't do anything about it, and we dont want to | |
3644 | * attempt an srp_transfer_data. | |
3645 | */ | |
3646 | if ((vscsi->flags & (CLIENT_FAILED | RESPONSE_Q_DOWN))) { | |
3647 | pr_err("write_pending failed since: %d\n", vscsi->flags); | |
3648 | return 0; | |
3649 | } | |
3650 | ||
88a678bb BL |
3651 | rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma, |
3652 | 1, 1); | |
3653 | if (rc) { | |
3654 | pr_err("srp_transfer_data() failed: %d\n", rc); | |
7c9d8d0c | 3655 | return -EIO; |
88a678bb BL |
3656 | } |
3657 | /* | |
3658 | * We now tell TCM to add this WRITE CDB directly into the TCM storage | |
3659 | * object execution queue. | |
3660 | */ | |
3661 | target_execute_cmd(se_cmd); | |
3662 | return 0; | |
3663 | } | |
3664 | ||
3665 | static int ibmvscsis_write_pending_status(struct se_cmd *se_cmd) | |
3666 | { | |
3667 | return 0; | |
3668 | } | |
3669 | ||
3670 | static void ibmvscsis_set_default_node_attrs(struct se_node_acl *nacl) | |
3671 | { | |
3672 | } | |
3673 | ||
3674 | static int ibmvscsis_get_cmd_state(struct se_cmd *se_cmd) | |
3675 | { | |
3676 | return 0; | |
3677 | } | |
3678 | ||
3679 | static int ibmvscsis_queue_data_in(struct se_cmd *se_cmd) | |
3680 | { | |
3681 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3682 | se_cmd); | |
3683 | struct iu_entry *iue = cmd->iue; | |
3684 | struct scsi_info *vscsi = cmd->adapter; | |
3685 | char *sd; | |
3686 | uint len = 0; | |
3687 | int rc; | |
3688 | ||
88a678bb BL |
3689 | rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma, 1, |
3690 | 1); | |
3691 | if (rc) { | |
3692 | pr_err("srp_transfer_data failed: %d\n", rc); | |
3693 | sd = se_cmd->sense_buffer; | |
3694 | se_cmd->scsi_sense_length = 18; | |
3695 | memset(se_cmd->sense_buffer, 0, se_cmd->scsi_sense_length); | |
3696 | /* Logical Unit Communication Time-out asc/ascq = 0x0801 */ | |
3697 | scsi_build_sense_buffer(0, se_cmd->sense_buffer, MEDIUM_ERROR, | |
3698 | 0x08, 0x01); | |
3699 | } | |
3700 | ||
3701 | srp_build_response(vscsi, cmd, &len); | |
3702 | cmd->rsp.format = SRP_FORMAT; | |
3703 | cmd->rsp.len = len; | |
3704 | ||
3705 | return 0; | |
3706 | } | |
3707 | ||
3708 | static int ibmvscsis_queue_status(struct se_cmd *se_cmd) | |
3709 | { | |
3710 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3711 | se_cmd); | |
3712 | struct scsi_info *vscsi = cmd->adapter; | |
3713 | uint len; | |
3714 | ||
3715 | pr_debug("queue_status %p\n", se_cmd); | |
3716 | ||
3717 | srp_build_response(vscsi, cmd, &len); | |
3718 | cmd->rsp.format = SRP_FORMAT; | |
3719 | cmd->rsp.len = len; | |
3720 | ||
3721 | return 0; | |
3722 | } | |
3723 | ||
3724 | static void ibmvscsis_queue_tm_rsp(struct se_cmd *se_cmd) | |
3725 | { | |
3726 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3727 | se_cmd); | |
3728 | struct scsi_info *vscsi = cmd->adapter; | |
25e78531 BL |
3729 | struct ibmvscsis_cmd *cmd_itr; |
3730 | struct iu_entry *iue = iue = cmd->iue; | |
3731 | struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt; | |
3732 | u64 tag_to_abort = be64_to_cpu(srp_tsk->task_tag); | |
88a678bb BL |
3733 | uint len; |
3734 | ||
3735 | pr_debug("queue_tm_rsp %p, status %d\n", | |
3736 | se_cmd, (int)se_cmd->se_tmr_req->response); | |
3737 | ||
25e78531 BL |
3738 | if (srp_tsk->tsk_mgmt_func == SRP_TSK_ABORT_TASK && |
3739 | cmd->se_cmd.se_tmr_req->response == TMR_TASK_DOES_NOT_EXIST) { | |
3740 | spin_lock_bh(&vscsi->intr_lock); | |
3741 | list_for_each_entry(cmd_itr, &vscsi->active_q, list) { | |
3742 | if (tag_to_abort == cmd_itr->se_cmd.tag) { | |
3743 | cmd_itr->abort_cmd = cmd; | |
3744 | cmd->flags |= DELAY_SEND; | |
3745 | break; | |
3746 | } | |
3747 | } | |
3748 | spin_unlock_bh(&vscsi->intr_lock); | |
3749 | } | |
3750 | ||
88a678bb BL |
3751 | srp_build_response(vscsi, cmd, &len); |
3752 | cmd->rsp.format = SRP_FORMAT; | |
3753 | cmd->rsp.len = len; | |
3754 | } | |
3755 | ||
3756 | static void ibmvscsis_aborted_task(struct se_cmd *se_cmd) | |
3757 | { | |
25e78531 BL |
3758 | pr_debug("ibmvscsis_aborted_task %p task_tag: %llu\n", |
3759 | se_cmd, se_cmd->tag); | |
88a678bb BL |
3760 | } |
3761 | ||
3762 | static struct se_wwn *ibmvscsis_make_tport(struct target_fabric_configfs *tf, | |
3763 | struct config_group *group, | |
3764 | const char *name) | |
3765 | { | |
3766 | struct ibmvscsis_tport *tport; | |
3767 | ||
3768 | tport = ibmvscsis_lookup_port(name); | |
3769 | if (tport) { | |
3770 | tport->tport_proto_id = SCSI_PROTOCOL_SRP; | |
3771 | pr_debug("make_tport(%s), pointer:%p, tport_id:%x\n", | |
3772 | name, tport, tport->tport_proto_id); | |
3773 | return &tport->tport_wwn; | |
3774 | } | |
3775 | ||
3776 | return ERR_PTR(-EINVAL); | |
3777 | } | |
3778 | ||
3779 | static void ibmvscsis_drop_tport(struct se_wwn *wwn) | |
3780 | { | |
3781 | struct ibmvscsis_tport *tport = container_of(wwn, | |
3782 | struct ibmvscsis_tport, | |
3783 | tport_wwn); | |
3784 | ||
3785 | pr_debug("drop_tport(%s)\n", | |
3786 | config_item_name(&tport->tport_wwn.wwn_group.cg_item)); | |
3787 | } | |
3788 | ||
3789 | static struct se_portal_group *ibmvscsis_make_tpg(struct se_wwn *wwn, | |
3790 | struct config_group *group, | |
3791 | const char *name) | |
3792 | { | |
3793 | struct ibmvscsis_tport *tport = | |
3794 | container_of(wwn, struct ibmvscsis_tport, tport_wwn); | |
3795 | int rc; | |
3796 | ||
3797 | tport->releasing = false; | |
3798 | ||
3799 | rc = core_tpg_register(&tport->tport_wwn, &tport->se_tpg, | |
3800 | tport->tport_proto_id); | |
3801 | if (rc) | |
3802 | return ERR_PTR(rc); | |
3803 | ||
3804 | return &tport->se_tpg; | |
3805 | } | |
3806 | ||
3807 | static void ibmvscsis_drop_tpg(struct se_portal_group *se_tpg) | |
3808 | { | |
3809 | struct ibmvscsis_tport *tport = container_of(se_tpg, | |
3810 | struct ibmvscsis_tport, | |
3811 | se_tpg); | |
3812 | ||
3813 | tport->releasing = true; | |
3814 | tport->enabled = false; | |
3815 | ||
3816 | /* | |
3817 | * Release the virtual I_T Nexus for this ibmvscsis TPG | |
3818 | */ | |
3819 | ibmvscsis_drop_nexus(tport); | |
3820 | /* | |
3821 | * Deregister the se_tpg from TCM.. | |
3822 | */ | |
3823 | core_tpg_deregister(se_tpg); | |
3824 | } | |
3825 | ||
3826 | static ssize_t ibmvscsis_wwn_version_show(struct config_item *item, | |
3827 | char *page) | |
3828 | { | |
3829 | return scnprintf(page, PAGE_SIZE, "%s\n", IBMVSCSIS_VERSION); | |
3830 | } | |
3831 | CONFIGFS_ATTR_RO(ibmvscsis_wwn_, version); | |
3832 | ||
3833 | static struct configfs_attribute *ibmvscsis_wwn_attrs[] = { | |
3834 | &ibmvscsis_wwn_attr_version, | |
3835 | NULL, | |
3836 | }; | |
3837 | ||
3838 | static ssize_t ibmvscsis_tpg_enable_show(struct config_item *item, | |
3839 | char *page) | |
3840 | { | |
3841 | struct se_portal_group *se_tpg = to_tpg(item); | |
3842 | struct ibmvscsis_tport *tport = container_of(se_tpg, | |
3843 | struct ibmvscsis_tport, | |
3844 | se_tpg); | |
3845 | ||
3846 | return snprintf(page, PAGE_SIZE, "%d\n", (tport->enabled) ? 1 : 0); | |
3847 | } | |
3848 | ||
3849 | static ssize_t ibmvscsis_tpg_enable_store(struct config_item *item, | |
3850 | const char *page, size_t count) | |
3851 | { | |
3852 | struct se_portal_group *se_tpg = to_tpg(item); | |
3853 | struct ibmvscsis_tport *tport = container_of(se_tpg, | |
3854 | struct ibmvscsis_tport, | |
3855 | se_tpg); | |
3856 | struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport); | |
3857 | unsigned long tmp; | |
3858 | int rc; | |
3859 | long lrc; | |
3860 | ||
3861 | rc = kstrtoul(page, 0, &tmp); | |
3862 | if (rc < 0) { | |
3863 | pr_err("Unable to extract srpt_tpg_store_enable\n"); | |
3864 | return -EINVAL; | |
3865 | } | |
3866 | ||
3867 | if ((tmp != 0) && (tmp != 1)) { | |
3868 | pr_err("Illegal value for srpt_tpg_store_enable\n"); | |
3869 | return -EINVAL; | |
3870 | } | |
3871 | ||
3872 | if (tmp) { | |
88a678bb | 3873 | spin_lock_bh(&vscsi->intr_lock); |
c9b3379f | 3874 | tport->enabled = true; |
88a678bb BL |
3875 | lrc = ibmvscsis_enable_change_state(vscsi); |
3876 | if (lrc) | |
3877 | pr_err("enable_change_state failed, rc %ld state %d\n", | |
3878 | lrc, vscsi->state); | |
3879 | spin_unlock_bh(&vscsi->intr_lock); | |
3880 | } else { | |
c9b3379f | 3881 | spin_lock_bh(&vscsi->intr_lock); |
88a678bb | 3882 | tport->enabled = false; |
c9b3379f MC |
3883 | /* This simulates the server going down */ |
3884 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); | |
3885 | spin_unlock_bh(&vscsi->intr_lock); | |
88a678bb BL |
3886 | } |
3887 | ||
c9b3379f | 3888 | pr_debug("tpg_enable_store, tmp %ld, state %d\n", tmp, vscsi->state); |
88a678bb BL |
3889 | |
3890 | return count; | |
3891 | } | |
3892 | CONFIGFS_ATTR(ibmvscsis_tpg_, enable); | |
3893 | ||
3894 | static struct configfs_attribute *ibmvscsis_tpg_attrs[] = { | |
3895 | &ibmvscsis_tpg_attr_enable, | |
3896 | NULL, | |
3897 | }; | |
3898 | ||
3899 | static const struct target_core_fabric_ops ibmvscsis_ops = { | |
3900 | .module = THIS_MODULE, | |
3901 | .name = "ibmvscsis", | |
b22bc278 | 3902 | .max_data_sg_nents = MAX_TXU / PAGE_SIZE, |
88a678bb BL |
3903 | .get_fabric_name = ibmvscsis_get_fabric_name, |
3904 | .tpg_get_wwn = ibmvscsis_get_fabric_wwn, | |
3905 | .tpg_get_tag = ibmvscsis_get_tag, | |
3906 | .tpg_get_default_depth = ibmvscsis_get_default_depth, | |
3907 | .tpg_check_demo_mode = ibmvscsis_check_true, | |
3908 | .tpg_check_demo_mode_cache = ibmvscsis_check_true, | |
3909 | .tpg_check_demo_mode_write_protect = ibmvscsis_check_false, | |
3910 | .tpg_check_prod_mode_write_protect = ibmvscsis_check_false, | |
3911 | .tpg_get_inst_index = ibmvscsis_tpg_get_inst_index, | |
3912 | .check_stop_free = ibmvscsis_check_stop_free, | |
3913 | .release_cmd = ibmvscsis_release_cmd, | |
3914 | .sess_get_index = ibmvscsis_sess_get_index, | |
3915 | .write_pending = ibmvscsis_write_pending, | |
3916 | .write_pending_status = ibmvscsis_write_pending_status, | |
3917 | .set_default_node_attributes = ibmvscsis_set_default_node_attrs, | |
3918 | .get_cmd_state = ibmvscsis_get_cmd_state, | |
3919 | .queue_data_in = ibmvscsis_queue_data_in, | |
3920 | .queue_status = ibmvscsis_queue_status, | |
3921 | .queue_tm_rsp = ibmvscsis_queue_tm_rsp, | |
3922 | .aborted_task = ibmvscsis_aborted_task, | |
3923 | /* | |
3924 | * Setup function pointers for logic in target_core_fabric_configfs.c | |
3925 | */ | |
3926 | .fabric_make_wwn = ibmvscsis_make_tport, | |
3927 | .fabric_drop_wwn = ibmvscsis_drop_tport, | |
3928 | .fabric_make_tpg = ibmvscsis_make_tpg, | |
3929 | .fabric_drop_tpg = ibmvscsis_drop_tpg, | |
3930 | ||
3931 | .tfc_wwn_attrs = ibmvscsis_wwn_attrs, | |
3932 | .tfc_tpg_base_attrs = ibmvscsis_tpg_attrs, | |
3933 | }; | |
3934 | ||
3935 | static void ibmvscsis_dev_release(struct device *dev) {}; | |
3936 | ||
3937 | static struct class_attribute ibmvscsis_class_attrs[] = { | |
3938 | __ATTR_NULL, | |
3939 | }; | |
3940 | ||
3941 | static struct device_attribute dev_attr_system_id = | |
3942 | __ATTR(system_id, S_IRUGO, system_id_show, NULL); | |
3943 | ||
3944 | static struct device_attribute dev_attr_partition_number = | |
3945 | __ATTR(partition_number, S_IRUGO, partition_number_show, NULL); | |
3946 | ||
3947 | static struct device_attribute dev_attr_unit_address = | |
3948 | __ATTR(unit_address, S_IRUGO, unit_address_show, NULL); | |
3949 | ||
3950 | static struct attribute *ibmvscsis_dev_attrs[] = { | |
3951 | &dev_attr_system_id.attr, | |
3952 | &dev_attr_partition_number.attr, | |
3953 | &dev_attr_unit_address.attr, | |
3954 | }; | |
3955 | ATTRIBUTE_GROUPS(ibmvscsis_dev); | |
3956 | ||
3957 | static struct class ibmvscsis_class = { | |
79fac9c9 MC |
3958 | .name = "ibmvscsis", |
3959 | .dev_release = ibmvscsis_dev_release, | |
3960 | .class_attrs = ibmvscsis_class_attrs, | |
3961 | .dev_groups = ibmvscsis_dev_groups, | |
88a678bb BL |
3962 | }; |
3963 | ||
3964 | static struct vio_device_id ibmvscsis_device_table[] = { | |
3965 | { "v-scsi-host", "IBM,v-scsi-host" }, | |
3966 | { "", "" } | |
3967 | }; | |
3968 | MODULE_DEVICE_TABLE(vio, ibmvscsis_device_table); | |
3969 | ||
3970 | static struct vio_driver ibmvscsis_driver = { | |
3971 | .name = "ibmvscsis", | |
3972 | .id_table = ibmvscsis_device_table, | |
3973 | .probe = ibmvscsis_probe, | |
3974 | .remove = ibmvscsis_remove, | |
3975 | }; | |
3976 | ||
3977 | /* | |
3978 | * ibmvscsis_init() - Kernel Module initialization | |
3979 | * | |
3980 | * Note: vio_register_driver() registers callback functions, and at least one | |
3981 | * of those callback functions calls TCM - Linux IO Target Subsystem, thus | |
3982 | * the SCSI Target template must be registered before vio_register_driver() | |
3983 | * is called. | |
3984 | */ | |
3985 | static int __init ibmvscsis_init(void) | |
3986 | { | |
3987 | int rc = 0; | |
3988 | ||
3989 | rc = ibmvscsis_get_system_info(); | |
3990 | if (rc) { | |
3991 | pr_err("rc %d from get_system_info\n", rc); | |
3992 | goto out; | |
3993 | } | |
3994 | ||
3995 | rc = class_register(&ibmvscsis_class); | |
3996 | if (rc) { | |
3997 | pr_err("failed class register\n"); | |
3998 | goto out; | |
3999 | } | |
4000 | ||
4001 | rc = target_register_template(&ibmvscsis_ops); | |
4002 | if (rc) { | |
4003 | pr_err("rc %d from target_register_template\n", rc); | |
4004 | goto unregister_class; | |
4005 | } | |
4006 | ||
4007 | rc = vio_register_driver(&ibmvscsis_driver); | |
4008 | if (rc) { | |
4009 | pr_err("rc %d from vio_register_driver\n", rc); | |
4010 | goto unregister_target; | |
4011 | } | |
4012 | ||
4013 | return 0; | |
4014 | ||
4015 | unregister_target: | |
4016 | target_unregister_template(&ibmvscsis_ops); | |
4017 | unregister_class: | |
4018 | class_unregister(&ibmvscsis_class); | |
4019 | out: | |
4020 | return rc; | |
4021 | } | |
4022 | ||
4023 | static void __exit ibmvscsis_exit(void) | |
4024 | { | |
4025 | pr_info("Unregister IBM virtual SCSI host driver\n"); | |
4026 | vio_unregister_driver(&ibmvscsis_driver); | |
4027 | target_unregister_template(&ibmvscsis_ops); | |
4028 | class_unregister(&ibmvscsis_class); | |
4029 | } | |
4030 | ||
4031 | MODULE_DESCRIPTION("IBMVSCSIS fabric driver"); | |
4032 | MODULE_AUTHOR("Bryant G. Ly and Michael Cyr"); | |
4033 | MODULE_LICENSE("GPL"); | |
4034 | MODULE_VERSION(IBMVSCSIS_VERSION); | |
4035 | module_init(ibmvscsis_init); | |
4036 | module_exit(ibmvscsis_exit); |