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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 | ||
417dff6c | 125 | dev_dbg(&vscsi->dev, "Connection_broken: rc %ld\n", h_return_code); |
88a678bb BL |
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: | |
464fd641 MC |
158 | spin_lock_bh(&vscsi->intr_lock); |
159 | vscsi->flags &= ~PREP_FOR_SUSPEND_FLAGS; | |
160 | spin_unlock_bh(&vscsi->intr_lock); | |
88a678bb BL |
161 | break; |
162 | ||
163 | case H_HARDWARE: | |
164 | case H_PARAMETER: | |
165 | dev_err(&vscsi->dev, "unregister_command_q: error from h_free_crq %ld\n", | |
166 | qrc); | |
167 | rc = ERROR; | |
168 | break; | |
169 | ||
170 | case H_BUSY: | |
171 | case H_LONG_BUSY_ORDER_1_MSEC: | |
172 | /* msleep not good for small values */ | |
173 | usleep_range(1000, 2000); | |
174 | ticks += 1; | |
175 | break; | |
176 | case H_LONG_BUSY_ORDER_10_MSEC: | |
177 | usleep_range(10000, 20000); | |
178 | ticks += 10; | |
179 | break; | |
180 | case H_LONG_BUSY_ORDER_100_MSEC: | |
181 | msleep(100); | |
182 | ticks += 100; | |
183 | break; | |
184 | case H_LONG_BUSY_ORDER_1_SEC: | |
185 | ssleep(1); | |
186 | ticks += 1000; | |
187 | break; | |
188 | case H_LONG_BUSY_ORDER_10_SEC: | |
189 | ssleep(10); | |
190 | ticks += 10000; | |
191 | break; | |
192 | case H_LONG_BUSY_ORDER_100_SEC: | |
193 | ssleep(100); | |
194 | ticks += 100000; | |
195 | break; | |
196 | default: | |
197 | dev_err(&vscsi->dev, "unregister_command_q: unknown error %ld from h_free_crq\n", | |
198 | qrc); | |
199 | rc = ERROR; | |
200 | break; | |
201 | } | |
202 | ||
203 | /* | |
204 | * dont wait more then 300 seconds | |
205 | * ticks are in milliseconds more or less | |
206 | */ | |
207 | if (ticks > 300000 && qrc != H_SUCCESS) { | |
208 | rc = ERROR; | |
209 | dev_err(&vscsi->dev, "Excessive wait for h_free_crq\n"); | |
210 | } | |
211 | } while (qrc != H_SUCCESS && rc == ADAPT_SUCCESS); | |
212 | ||
417dff6c | 213 | dev_dbg(&vscsi->dev, "Freeing CRQ: phyp rc %ld, rc %ld\n", qrc, rc); |
88a678bb BL |
214 | |
215 | return rc; | |
216 | } | |
217 | ||
218 | /** | |
219 | * ibmvscsis_delete_client_info() - Helper function to Delete Client Info | |
220 | * @vscsi: Pointer to our adapter structure | |
221 | * @client_closed: True if client closed its queue | |
222 | * | |
223 | * Deletes information specific to the client when the client goes away | |
224 | * | |
225 | * EXECUTION ENVIRONMENT: | |
226 | * Interrupt or Process | |
227 | */ | |
228 | static void ibmvscsis_delete_client_info(struct scsi_info *vscsi, | |
229 | bool client_closed) | |
230 | { | |
231 | vscsi->client_cap = 0; | |
232 | ||
233 | /* | |
234 | * Some things we don't want to clear if we're closing the queue, | |
235 | * because some clients don't resend the host handshake when they | |
236 | * get a transport event. | |
237 | */ | |
238 | if (client_closed) | |
239 | vscsi->client_data.os_type = 0; | |
240 | } | |
241 | ||
242 | /** | |
243 | * ibmvscsis_free_command_q() - Free Command Queue | |
244 | * @vscsi: Pointer to our adapter structure | |
245 | * | |
246 | * This function calls unregister_command_q, then clears interrupts and | |
247 | * any pending interrupt acknowledgments associated with the command q. | |
248 | * It also clears memory if there is no error. | |
249 | * | |
250 | * PHYP did not meet the PAPR architecture so that we must give up the | |
251 | * lock. This causes a timing hole regarding state change. To close the | |
252 | * hole this routine does accounting on any change that occurred during | |
253 | * the time the lock is not held. | |
254 | * NOTE: must give up and then acquire the interrupt lock, the caller must | |
255 | * make sure that state and or flags will prevent interrupt handler from | |
256 | * scheduling work. | |
257 | * | |
258 | * EXECUTION ENVIRONMENT: | |
259 | * Process level, interrupt lock is held | |
260 | */ | |
261 | static long ibmvscsis_free_command_q(struct scsi_info *vscsi) | |
262 | { | |
263 | int bytes; | |
264 | u32 flags_under_lock; | |
265 | u16 state_under_lock; | |
266 | long rc = ADAPT_SUCCESS; | |
267 | ||
268 | if (!(vscsi->flags & CRQ_CLOSED)) { | |
269 | vio_disable_interrupts(vscsi->dma_dev); | |
270 | ||
271 | state_under_lock = vscsi->new_state; | |
272 | flags_under_lock = vscsi->flags; | |
273 | vscsi->phyp_acr_state = 0; | |
274 | vscsi->phyp_acr_flags = 0; | |
275 | ||
276 | spin_unlock_bh(&vscsi->intr_lock); | |
277 | rc = ibmvscsis_unregister_command_q(vscsi); | |
278 | spin_lock_bh(&vscsi->intr_lock); | |
279 | ||
280 | if (state_under_lock != vscsi->new_state) | |
281 | vscsi->phyp_acr_state = vscsi->new_state; | |
282 | ||
283 | vscsi->phyp_acr_flags = ((~flags_under_lock) & vscsi->flags); | |
284 | ||
285 | if (rc == ADAPT_SUCCESS) { | |
286 | bytes = vscsi->cmd_q.size * PAGE_SIZE; | |
287 | memset(vscsi->cmd_q.base_addr, 0, bytes); | |
288 | vscsi->cmd_q.index = 0; | |
289 | vscsi->flags |= CRQ_CLOSED; | |
290 | ||
291 | ibmvscsis_delete_client_info(vscsi, false); | |
292 | } | |
293 | ||
417dff6c BL |
294 | dev_dbg(&vscsi->dev, "free_command_q: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n", |
295 | vscsi->flags, vscsi->state, vscsi->phyp_acr_flags, | |
296 | vscsi->phyp_acr_state); | |
88a678bb BL |
297 | } |
298 | return rc; | |
299 | } | |
300 | ||
301 | /** | |
302 | * ibmvscsis_cmd_q_dequeue() - Get valid Command element | |
303 | * @mask: Mask to use in case index wraps | |
304 | * @current_index: Current index into command queue | |
305 | * @base_addr: Pointer to start of command queue | |
306 | * | |
307 | * Returns a pointer to a valid command element or NULL, if the command | |
308 | * queue is empty | |
309 | * | |
310 | * EXECUTION ENVIRONMENT: | |
311 | * Interrupt environment, interrupt lock held | |
312 | */ | |
313 | static struct viosrp_crq *ibmvscsis_cmd_q_dequeue(uint mask, | |
314 | uint *current_index, | |
315 | struct viosrp_crq *base_addr) | |
316 | { | |
317 | struct viosrp_crq *ptr; | |
318 | ||
319 | ptr = base_addr + *current_index; | |
320 | ||
321 | if (ptr->valid) { | |
322 | *current_index = (*current_index + 1) & mask; | |
323 | dma_rmb(); | |
324 | } else { | |
325 | ptr = NULL; | |
326 | } | |
327 | ||
328 | return ptr; | |
329 | } | |
330 | ||
331 | /** | |
79fac9c9 | 332 | * ibmvscsis_send_init_message() - send initialize message to the client |
88a678bb BL |
333 | * @vscsi: Pointer to our adapter structure |
334 | * @format: Which Init Message format to send | |
335 | * | |
336 | * EXECUTION ENVIRONMENT: | |
337 | * Interrupt environment interrupt lock held | |
338 | */ | |
339 | static long ibmvscsis_send_init_message(struct scsi_info *vscsi, u8 format) | |
340 | { | |
341 | struct viosrp_crq *crq; | |
342 | u64 buffer[2] = { 0, 0 }; | |
343 | long rc; | |
344 | ||
345 | crq = (struct viosrp_crq *)&buffer; | |
346 | crq->valid = VALID_INIT_MSG; | |
347 | crq->format = format; | |
348 | rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]), | |
349 | cpu_to_be64(buffer[MSG_LOW])); | |
350 | ||
351 | return rc; | |
352 | } | |
353 | ||
354 | /** | |
355 | * ibmvscsis_check_init_msg() - Check init message valid | |
356 | * @vscsi: Pointer to our adapter structure | |
357 | * @format: Pointer to return format of Init Message, if any. | |
358 | * Set to UNUSED_FORMAT if no Init Message in queue. | |
359 | * | |
360 | * Checks if an initialize message was queued by the initiatior | |
361 | * after the queue was created and before the interrupt was enabled. | |
362 | * | |
363 | * EXECUTION ENVIRONMENT: | |
364 | * Process level only, interrupt lock held | |
365 | */ | |
366 | static long ibmvscsis_check_init_msg(struct scsi_info *vscsi, uint *format) | |
367 | { | |
368 | struct viosrp_crq *crq; | |
369 | long rc = ADAPT_SUCCESS; | |
370 | ||
371 | crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask, &vscsi->cmd_q.index, | |
372 | vscsi->cmd_q.base_addr); | |
373 | if (!crq) { | |
374 | *format = (uint)UNUSED_FORMAT; | |
375 | } else if (crq->valid == VALID_INIT_MSG && crq->format == INIT_MSG) { | |
376 | *format = (uint)INIT_MSG; | |
377 | crq->valid = INVALIDATE_CMD_RESP_EL; | |
378 | dma_rmb(); | |
379 | ||
380 | /* | |
381 | * the caller has ensured no initialize message was | |
382 | * sent after the queue was | |
383 | * created so there should be no other message on the queue. | |
384 | */ | |
385 | crq = ibmvscsis_cmd_q_dequeue(vscsi->cmd_q.mask, | |
386 | &vscsi->cmd_q.index, | |
387 | vscsi->cmd_q.base_addr); | |
388 | if (crq) { | |
389 | *format = (uint)(crq->format); | |
79fac9c9 | 390 | rc = ERROR; |
88a678bb BL |
391 | crq->valid = INVALIDATE_CMD_RESP_EL; |
392 | dma_rmb(); | |
393 | } | |
394 | } else { | |
395 | *format = (uint)(crq->format); | |
79fac9c9 | 396 | rc = ERROR; |
88a678bb BL |
397 | crq->valid = INVALIDATE_CMD_RESP_EL; |
398 | dma_rmb(); | |
399 | } | |
400 | ||
401 | return rc; | |
402 | } | |
403 | ||
88a678bb BL |
404 | /** |
405 | * ibmvscsis_disconnect() - Helper function to disconnect | |
406 | * @work: Pointer to work_struct, gives access to our adapter structure | |
407 | * | |
408 | * An error has occurred or the driver received a Transport event, | |
409 | * and the driver is requesting that the command queue be de-registered | |
410 | * in a safe manner. If there is no outstanding I/O then we can stop the | |
411 | * queue. If we are restarting the queue it will be reflected in the | |
412 | * the state of the adapter. | |
413 | * | |
414 | * EXECUTION ENVIRONMENT: | |
415 | * Process environment | |
416 | */ | |
417 | static void ibmvscsis_disconnect(struct work_struct *work) | |
418 | { | |
419 | struct scsi_info *vscsi = container_of(work, struct scsi_info, | |
420 | proc_work); | |
421 | u16 new_state; | |
422 | bool wait_idle = false; | |
88a678bb BL |
423 | |
424 | spin_lock_bh(&vscsi->intr_lock); | |
425 | new_state = vscsi->new_state; | |
426 | vscsi->new_state = 0; | |
427 | ||
464fd641 MC |
428 | vscsi->flags |= DISCONNECT_SCHEDULED; |
429 | vscsi->flags &= ~SCHEDULE_DISCONNECT; | |
430 | ||
417dff6c BL |
431 | dev_dbg(&vscsi->dev, "disconnect: flags 0x%x, state 0x%hx\n", |
432 | vscsi->flags, vscsi->state); | |
88a678bb BL |
433 | |
434 | /* | |
435 | * check which state we are in and see if we | |
436 | * should transitition to the new state | |
437 | */ | |
438 | switch (vscsi->state) { | |
79fac9c9 | 439 | /* Should never be called while in this state. */ |
88a678bb BL |
440 | case NO_QUEUE: |
441 | /* | |
442 | * Can never transition from this state; | |
443 | * igonore errors and logout. | |
444 | */ | |
445 | case UNCONFIGURING: | |
446 | break; | |
447 | ||
448 | /* can transition from this state to UNCONFIGURING */ | |
449 | case ERR_DISCONNECT: | |
450 | if (new_state == UNCONFIGURING) | |
451 | vscsi->state = new_state; | |
452 | break; | |
453 | ||
454 | /* | |
455 | * Can transition from this state to to unconfiguring | |
456 | * or err disconnect. | |
457 | */ | |
458 | case ERR_DISCONNECT_RECONNECT: | |
459 | switch (new_state) { | |
460 | case UNCONFIGURING: | |
461 | case ERR_DISCONNECT: | |
462 | vscsi->state = new_state; | |
463 | break; | |
464 | ||
465 | case WAIT_IDLE: | |
466 | break; | |
467 | default: | |
468 | break; | |
469 | } | |
470 | break; | |
471 | ||
472 | /* can transition from this state to UNCONFIGURING */ | |
473 | case ERR_DISCONNECTED: | |
474 | if (new_state == UNCONFIGURING) | |
475 | vscsi->state = new_state; | |
476 | break; | |
477 | ||
88a678bb | 478 | case WAIT_ENABLED: |
88a678bb | 479 | switch (new_state) { |
8bf11557 MC |
480 | case UNCONFIGURING: |
481 | vscsi->state = new_state; | |
482 | vscsi->flags |= RESPONSE_Q_DOWN; | |
483 | vscsi->flags &= ~(SCHEDULE_DISCONNECT | | |
484 | DISCONNECT_SCHEDULED); | |
485 | dma_rmb(); | |
486 | if (vscsi->flags & CFG_SLEEPING) { | |
487 | vscsi->flags &= ~CFG_SLEEPING; | |
488 | complete(&vscsi->unconfig); | |
489 | } | |
490 | break; | |
491 | ||
c9b3379f | 492 | /* should never happen */ |
88a678bb | 493 | case ERR_DISCONNECT: |
88a678bb | 494 | case ERR_DISCONNECT_RECONNECT: |
88a678bb | 495 | case WAIT_IDLE: |
88a678bb BL |
496 | dev_err(&vscsi->dev, "disconnect: invalid state %d for WAIT_IDLE\n", |
497 | vscsi->state); | |
498 | break; | |
499 | } | |
500 | break; | |
501 | ||
502 | case WAIT_IDLE: | |
503 | switch (new_state) { | |
8bf11557 MC |
504 | case UNCONFIGURING: |
505 | vscsi->flags |= RESPONSE_Q_DOWN; | |
506 | vscsi->state = new_state; | |
507 | vscsi->flags &= ~(SCHEDULE_DISCONNECT | | |
508 | DISCONNECT_SCHEDULED); | |
509 | ibmvscsis_free_command_q(vscsi); | |
510 | break; | |
88a678bb BL |
511 | case ERR_DISCONNECT: |
512 | case ERR_DISCONNECT_RECONNECT: | |
513 | vscsi->state = new_state; | |
514 | break; | |
515 | } | |
516 | break; | |
517 | ||
518 | /* | |
519 | * Initiator has not done a successful srp login | |
520 | * or has done a successful srp logout ( adapter was not | |
521 | * busy). In the first case there can be responses queued | |
522 | * waiting for space on the initiators response queue (MAD) | |
523 | * The second case the adapter is idle. Assume the worse case, | |
524 | * i.e. the second case. | |
525 | */ | |
526 | case WAIT_CONNECTION: | |
527 | case CONNECTED: | |
528 | case SRP_PROCESSING: | |
529 | wait_idle = true; | |
530 | vscsi->state = new_state; | |
531 | break; | |
532 | ||
533 | /* can transition from this state to UNCONFIGURING */ | |
534 | case UNDEFINED: | |
535 | if (new_state == UNCONFIGURING) | |
536 | vscsi->state = new_state; | |
537 | break; | |
538 | default: | |
539 | break; | |
540 | } | |
541 | ||
542 | if (wait_idle) { | |
417dff6c BL |
543 | dev_dbg(&vscsi->dev, "disconnect start wait, active %d, sched %d\n", |
544 | (int)list_empty(&vscsi->active_q), | |
545 | (int)list_empty(&vscsi->schedule_q)); | |
88a678bb BL |
546 | if (!list_empty(&vscsi->active_q) || |
547 | !list_empty(&vscsi->schedule_q)) { | |
548 | vscsi->flags |= WAIT_FOR_IDLE; | |
417dff6c BL |
549 | dev_dbg(&vscsi->dev, "disconnect flags 0x%x\n", |
550 | vscsi->flags); | |
88a678bb BL |
551 | /* |
552 | * This routine is can not be called with the interrupt | |
553 | * lock held. | |
554 | */ | |
555 | spin_unlock_bh(&vscsi->intr_lock); | |
556 | wait_for_completion(&vscsi->wait_idle); | |
557 | spin_lock_bh(&vscsi->intr_lock); | |
558 | } | |
417dff6c | 559 | dev_dbg(&vscsi->dev, "disconnect stop wait\n"); |
88a678bb BL |
560 | |
561 | ibmvscsis_adapter_idle(vscsi); | |
562 | } | |
563 | ||
564 | spin_unlock_bh(&vscsi->intr_lock); | |
565 | } | |
566 | ||
567 | /** | |
568 | * ibmvscsis_post_disconnect() - Schedule the disconnect | |
569 | * @vscsi: Pointer to our adapter structure | |
570 | * @new_state: State to move to after disconnecting | |
571 | * @flag_bits: Flags to turn on in adapter structure | |
572 | * | |
573 | * If it's already been scheduled, then see if we need to "upgrade" | |
574 | * the new state (if the one passed in is more "severe" than the | |
575 | * previous one). | |
576 | * | |
79fac9c9 MC |
577 | * PRECONDITION: |
578 | * interrupt lock is held | |
579 | */ | |
580 | static void ibmvscsis_post_disconnect(struct scsi_info *vscsi, uint new_state, | |
581 | uint flag_bits) | |
582 | { | |
583 | uint state; | |
584 | ||
585 | /* check the validity of the new state */ | |
586 | switch (new_state) { | |
587 | case UNCONFIGURING: | |
588 | case ERR_DISCONNECT: | |
589 | case ERR_DISCONNECT_RECONNECT: | |
590 | case WAIT_IDLE: | |
591 | break; | |
592 | ||
593 | default: | |
594 | dev_err(&vscsi->dev, "post_disconnect: Invalid new state %d\n", | |
595 | new_state); | |
596 | return; | |
597 | } | |
598 | ||
599 | vscsi->flags |= flag_bits; | |
600 | ||
417dff6c BL |
601 | dev_dbg(&vscsi->dev, "post_disconnect: new_state 0x%x, flag_bits 0x%x, vscsi->flags 0x%x, state %hx\n", |
602 | new_state, flag_bits, vscsi->flags, vscsi->state); | |
79fac9c9 MC |
603 | |
604 | if (!(vscsi->flags & (DISCONNECT_SCHEDULED | SCHEDULE_DISCONNECT))) { | |
605 | vscsi->flags |= SCHEDULE_DISCONNECT; | |
606 | vscsi->new_state = new_state; | |
607 | ||
608 | INIT_WORK(&vscsi->proc_work, ibmvscsis_disconnect); | |
609 | (void)queue_work(vscsi->work_q, &vscsi->proc_work); | |
610 | } else { | |
611 | if (vscsi->new_state) | |
612 | state = vscsi->new_state; | |
613 | else | |
614 | state = vscsi->state; | |
615 | ||
616 | switch (state) { | |
617 | case NO_QUEUE: | |
618 | case UNCONFIGURING: | |
619 | break; | |
620 | ||
621 | case ERR_DISCONNECTED: | |
622 | case ERR_DISCONNECT: | |
623 | case UNDEFINED: | |
624 | if (new_state == UNCONFIGURING) | |
625 | vscsi->new_state = new_state; | |
626 | break; | |
627 | ||
628 | case ERR_DISCONNECT_RECONNECT: | |
629 | switch (new_state) { | |
630 | case UNCONFIGURING: | |
631 | case ERR_DISCONNECT: | |
632 | vscsi->new_state = new_state; | |
633 | break; | |
634 | default: | |
635 | break; | |
636 | } | |
637 | break; | |
638 | ||
639 | case WAIT_ENABLED: | |
79fac9c9 MC |
640 | case WAIT_IDLE: |
641 | case WAIT_CONNECTION: | |
642 | case CONNECTED: | |
643 | case SRP_PROCESSING: | |
644 | vscsi->new_state = new_state; | |
645 | break; | |
646 | ||
647 | default: | |
648 | break; | |
649 | } | |
650 | } | |
651 | ||
417dff6c BL |
652 | dev_dbg(&vscsi->dev, "Leaving post_disconnect: flags 0x%x, new_state 0x%x\n", |
653 | vscsi->flags, vscsi->new_state); | |
79fac9c9 MC |
654 | } |
655 | ||
656 | /** | |
657 | * ibmvscsis_handle_init_compl_msg() - Respond to an Init Complete Message | |
658 | * @vscsi: Pointer to our adapter structure | |
659 | * | |
660 | * Must be called with interrupt lock held. | |
661 | */ | |
662 | static long ibmvscsis_handle_init_compl_msg(struct scsi_info *vscsi) | |
663 | { | |
664 | long rc = ADAPT_SUCCESS; | |
665 | ||
666 | switch (vscsi->state) { | |
667 | case NO_QUEUE: | |
668 | case ERR_DISCONNECT: | |
669 | case ERR_DISCONNECT_RECONNECT: | |
670 | case ERR_DISCONNECTED: | |
671 | case UNCONFIGURING: | |
672 | case UNDEFINED: | |
673 | rc = ERROR; | |
674 | break; | |
675 | ||
676 | case WAIT_CONNECTION: | |
677 | vscsi->state = CONNECTED; | |
678 | break; | |
679 | ||
680 | case WAIT_IDLE: | |
681 | case SRP_PROCESSING: | |
682 | case CONNECTED: | |
683 | case WAIT_ENABLED: | |
79fac9c9 MC |
684 | default: |
685 | rc = ERROR; | |
686 | dev_err(&vscsi->dev, "init_msg: invalid state %d to get init compl msg\n", | |
687 | vscsi->state); | |
688 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
689 | break; | |
690 | } | |
691 | ||
692 | return rc; | |
693 | } | |
694 | ||
695 | /** | |
696 | * ibmvscsis_handle_init_msg() - Respond to an Init Message | |
697 | * @vscsi: Pointer to our adapter structure | |
698 | * | |
699 | * Must be called with interrupt lock held. | |
700 | */ | |
701 | static long ibmvscsis_handle_init_msg(struct scsi_info *vscsi) | |
702 | { | |
703 | long rc = ADAPT_SUCCESS; | |
704 | ||
705 | switch (vscsi->state) { | |
79fac9c9 MC |
706 | case WAIT_CONNECTION: |
707 | rc = ibmvscsis_send_init_message(vscsi, INIT_COMPLETE_MSG); | |
708 | switch (rc) { | |
709 | case H_SUCCESS: | |
710 | vscsi->state = CONNECTED; | |
711 | break; | |
712 | ||
713 | case H_PARAMETER: | |
714 | dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n", | |
715 | rc); | |
716 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); | |
717 | break; | |
718 | ||
719 | case H_DROPPED: | |
720 | dev_err(&vscsi->dev, "init_msg: failed to send, rc %ld\n", | |
721 | rc); | |
722 | rc = ERROR; | |
723 | ibmvscsis_post_disconnect(vscsi, | |
724 | ERR_DISCONNECT_RECONNECT, 0); | |
725 | break; | |
726 | ||
727 | case H_CLOSED: | |
417dff6c BL |
728 | dev_warn(&vscsi->dev, "init_msg: failed to send, rc %ld\n", |
729 | rc); | |
79fac9c9 MC |
730 | rc = 0; |
731 | break; | |
732 | } | |
733 | break; | |
734 | ||
735 | case UNDEFINED: | |
736 | rc = ERROR; | |
737 | break; | |
738 | ||
739 | case UNCONFIGURING: | |
740 | break; | |
741 | ||
c9b3379f | 742 | case WAIT_ENABLED: |
79fac9c9 MC |
743 | case CONNECTED: |
744 | case SRP_PROCESSING: | |
745 | case WAIT_IDLE: | |
746 | case NO_QUEUE: | |
747 | case ERR_DISCONNECT: | |
748 | case ERR_DISCONNECT_RECONNECT: | |
749 | case ERR_DISCONNECTED: | |
750 | default: | |
751 | rc = ERROR; | |
752 | dev_err(&vscsi->dev, "init_msg: invalid state %d to get init msg\n", | |
753 | vscsi->state); | |
754 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
755 | break; | |
756 | } | |
757 | ||
758 | return rc; | |
759 | } | |
760 | ||
761 | /** | |
762 | * ibmvscsis_init_msg() - Respond to an init message | |
763 | * @vscsi: Pointer to our adapter structure | |
764 | * @crq: Pointer to CRQ element containing the Init Message | |
765 | * | |
766 | * EXECUTION ENVIRONMENT: | |
767 | * Interrupt, interrupt lock held | |
768 | */ | |
769 | static long ibmvscsis_init_msg(struct scsi_info *vscsi, struct viosrp_crq *crq) | |
770 | { | |
771 | long rc = ADAPT_SUCCESS; | |
772 | ||
417dff6c | 773 | dev_dbg(&vscsi->dev, "init_msg: state 0x%hx\n", vscsi->state); |
79fac9c9 MC |
774 | |
775 | rc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO, | |
776 | (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0, | |
777 | 0); | |
778 | if (rc == H_SUCCESS) { | |
779 | vscsi->client_data.partition_number = | |
780 | be64_to_cpu(*(u64 *)vscsi->map_buf); | |
417dff6c BL |
781 | dev_dbg(&vscsi->dev, "init_msg, part num %d\n", |
782 | vscsi->client_data.partition_number); | |
79fac9c9 | 783 | } else { |
417dff6c | 784 | dev_dbg(&vscsi->dev, "init_msg h_vioctl rc %ld\n", rc); |
79fac9c9 MC |
785 | rc = ADAPT_SUCCESS; |
786 | } | |
787 | ||
788 | if (crq->format == INIT_MSG) { | |
789 | rc = ibmvscsis_handle_init_msg(vscsi); | |
790 | } else if (crq->format == INIT_COMPLETE_MSG) { | |
791 | rc = ibmvscsis_handle_init_compl_msg(vscsi); | |
792 | } else { | |
793 | rc = ERROR; | |
794 | dev_err(&vscsi->dev, "init_msg: invalid format %d\n", | |
795 | (uint)crq->format); | |
796 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
797 | } | |
798 | ||
799 | return rc; | |
800 | } | |
801 | ||
802 | /** | |
803 | * ibmvscsis_establish_new_q() - Establish new CRQ queue | |
804 | * @vscsi: Pointer to our adapter structure | |
79fac9c9 MC |
805 | * |
806 | * Must be called with interrupt lock held. | |
807 | */ | |
c9b3379f | 808 | static long ibmvscsis_establish_new_q(struct scsi_info *vscsi) |
79fac9c9 MC |
809 | { |
810 | long rc = ADAPT_SUCCESS; | |
811 | uint format; | |
812 | ||
464fd641 MC |
813 | rc = h_vioctl(vscsi->dds.unit_id, H_ENABLE_PREPARE_FOR_SUSPEND, 30000, |
814 | 0, 0, 0, 0); | |
815 | if (rc == H_SUCCESS) | |
816 | vscsi->flags |= PREP_FOR_SUSPEND_ENABLED; | |
817 | else if (rc != H_NOT_FOUND) | |
417dff6c BL |
818 | dev_err(&vscsi->dev, "Error from Enable Prepare for Suspend: %ld\n", |
819 | rc); | |
464fd641 | 820 | |
79fac9c9 MC |
821 | vscsi->flags &= PRESERVE_FLAG_FIELDS; |
822 | vscsi->rsp_q_timer.timer_pops = 0; | |
823 | vscsi->debit = 0; | |
824 | vscsi->credit = 0; | |
825 | ||
826 | rc = vio_enable_interrupts(vscsi->dma_dev); | |
827 | if (rc) { | |
417dff6c BL |
828 | dev_warn(&vscsi->dev, "establish_new_q: failed to enable interrupts, rc %ld\n", |
829 | rc); | |
79fac9c9 MC |
830 | return rc; |
831 | } | |
832 | ||
833 | rc = ibmvscsis_check_init_msg(vscsi, &format); | |
834 | if (rc) { | |
c9b3379f | 835 | dev_err(&vscsi->dev, "establish_new_q: check_init_msg failed, rc %ld\n", |
79fac9c9 MC |
836 | rc); |
837 | return rc; | |
838 | } | |
839 | ||
c9b3379f | 840 | if (format == UNUSED_FORMAT) { |
79fac9c9 MC |
841 | rc = ibmvscsis_send_init_message(vscsi, INIT_MSG); |
842 | switch (rc) { | |
843 | case H_SUCCESS: | |
844 | case H_DROPPED: | |
845 | case H_CLOSED: | |
846 | rc = ADAPT_SUCCESS; | |
847 | break; | |
848 | ||
849 | case H_PARAMETER: | |
850 | case H_HARDWARE: | |
851 | break; | |
852 | ||
853 | default: | |
854 | vscsi->state = UNDEFINED; | |
855 | rc = H_HARDWARE; | |
856 | break; | |
857 | } | |
c9b3379f MC |
858 | } else if (format == INIT_MSG) { |
859 | rc = ibmvscsis_handle_init_msg(vscsi); | |
79fac9c9 MC |
860 | } |
861 | ||
862 | return rc; | |
863 | } | |
864 | ||
865 | /** | |
866 | * ibmvscsis_reset_queue() - Reset CRQ Queue | |
867 | * @vscsi: Pointer to our adapter structure | |
79fac9c9 MC |
868 | * |
869 | * This function calls h_free_q and then calls h_reg_q and does all | |
870 | * of the bookkeeping to get us back to where we can communicate. | |
871 | * | |
872 | * Actually, we don't always call h_free_crq. A problem was discovered | |
873 | * where one partition would close and reopen his queue, which would | |
874 | * cause his partner to get a transport event, which would cause him to | |
875 | * close and reopen his queue, which would cause the original partition | |
876 | * to get a transport event, etc., etc. To prevent this, we don't | |
877 | * actually close our queue if the client initiated the reset, (i.e. | |
878 | * either we got a transport event or we have detected that the client's | |
879 | * queue is gone) | |
880 | * | |
881 | * EXECUTION ENVIRONMENT: | |
882 | * Process environment, called with interrupt lock held | |
883 | */ | |
c9b3379f | 884 | static void ibmvscsis_reset_queue(struct scsi_info *vscsi) |
79fac9c9 MC |
885 | { |
886 | int bytes; | |
887 | long rc = ADAPT_SUCCESS; | |
888 | ||
417dff6c | 889 | dev_dbg(&vscsi->dev, "reset_queue: flags 0x%x\n", vscsi->flags); |
79fac9c9 MC |
890 | |
891 | /* don't reset, the client did it for us */ | |
892 | if (vscsi->flags & (CLIENT_FAILED | TRANS_EVENT)) { | |
893 | vscsi->flags &= PRESERVE_FLAG_FIELDS; | |
894 | vscsi->rsp_q_timer.timer_pops = 0; | |
895 | vscsi->debit = 0; | |
896 | vscsi->credit = 0; | |
c9b3379f | 897 | vscsi->state = WAIT_CONNECTION; |
79fac9c9 MC |
898 | vio_enable_interrupts(vscsi->dma_dev); |
899 | } else { | |
900 | rc = ibmvscsis_free_command_q(vscsi); | |
901 | if (rc == ADAPT_SUCCESS) { | |
c9b3379f | 902 | vscsi->state = WAIT_CONNECTION; |
79fac9c9 MC |
903 | |
904 | bytes = vscsi->cmd_q.size * PAGE_SIZE; | |
905 | rc = h_reg_crq(vscsi->dds.unit_id, | |
906 | vscsi->cmd_q.crq_token, bytes); | |
907 | if (rc == H_CLOSED || rc == H_SUCCESS) { | |
c9b3379f | 908 | rc = ibmvscsis_establish_new_q(vscsi); |
79fac9c9 MC |
909 | } |
910 | ||
911 | if (rc != ADAPT_SUCCESS) { | |
417dff6c BL |
912 | dev_dbg(&vscsi->dev, "reset_queue: reg_crq rc %ld\n", |
913 | rc); | |
79fac9c9 MC |
914 | |
915 | vscsi->state = ERR_DISCONNECTED; | |
916 | vscsi->flags |= RESPONSE_Q_DOWN; | |
917 | ibmvscsis_free_command_q(vscsi); | |
918 | } | |
919 | } else { | |
920 | vscsi->state = ERR_DISCONNECTED; | |
921 | vscsi->flags |= RESPONSE_Q_DOWN; | |
922 | } | |
923 | } | |
924 | } | |
925 | ||
926 | /** | |
927 | * ibmvscsis_free_cmd_resources() - Free command resources | |
928 | * @vscsi: Pointer to our adapter structure | |
929 | * @cmd: Command which is not longer in use | |
930 | * | |
931 | * Must be called with interrupt lock held. | |
88a678bb | 932 | */ |
79fac9c9 MC |
933 | static void ibmvscsis_free_cmd_resources(struct scsi_info *vscsi, |
934 | struct ibmvscsis_cmd *cmd) | |
88a678bb | 935 | { |
79fac9c9 | 936 | struct iu_entry *iue = cmd->iue; |
88a678bb | 937 | |
79fac9c9 MC |
938 | switch (cmd->type) { |
939 | case TASK_MANAGEMENT: | |
940 | case SCSI_CDB: | |
941 | /* | |
942 | * When the queue goes down this value is cleared, so it | |
943 | * cannot be cleared in this general purpose function. | |
944 | */ | |
945 | if (vscsi->debit) | |
946 | vscsi->debit -= 1; | |
947 | break; | |
948 | case ADAPTER_MAD: | |
949 | vscsi->flags &= ~PROCESSING_MAD; | |
950 | break; | |
951 | case UNSET_TYPE: | |
88a678bb | 952 | break; |
88a678bb | 953 | default: |
79fac9c9 MC |
954 | dev_err(&vscsi->dev, "free_cmd_resources unknown type %d\n", |
955 | cmd->type); | |
956 | break; | |
88a678bb BL |
957 | } |
958 | ||
79fac9c9 MC |
959 | cmd->iue = NULL; |
960 | list_add_tail(&cmd->list, &vscsi->free_cmd); | |
961 | srp_iu_put(iue); | |
88a678bb | 962 | |
79fac9c9 MC |
963 | if (list_empty(&vscsi->active_q) && list_empty(&vscsi->schedule_q) && |
964 | list_empty(&vscsi->waiting_rsp) && (vscsi->flags & WAIT_FOR_IDLE)) { | |
965 | vscsi->flags &= ~WAIT_FOR_IDLE; | |
966 | complete(&vscsi->wait_idle); | |
88a678bb | 967 | } |
88a678bb BL |
968 | } |
969 | ||
464fd641 MC |
970 | /** |
971 | * ibmvscsis_ready_for_suspend() - Helper function to call VIOCTL | |
972 | * @vscsi: Pointer to our adapter structure | |
973 | * @idle: Indicates whether we were called from adapter_idle. This | |
974 | * is important to know if we need to do a disconnect, since if | |
975 | * we're called from adapter_idle, we're still processing the | |
976 | * current disconnect, so we can't just call post_disconnect. | |
977 | * | |
978 | * This function is called when the adapter is idle when phyp has sent | |
979 | * us a Prepare for Suspend Transport Event. | |
980 | * | |
981 | * EXECUTION ENVIRONMENT: | |
982 | * Process or interrupt environment called with interrupt lock held | |
983 | */ | |
984 | static long ibmvscsis_ready_for_suspend(struct scsi_info *vscsi, bool idle) | |
985 | { | |
986 | long rc = 0; | |
987 | struct viosrp_crq *crq; | |
988 | ||
989 | /* See if there is a Resume event in the queue */ | |
990 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
991 | ||
417dff6c BL |
992 | dev_dbg(&vscsi->dev, "ready_suspend: flags 0x%x, state 0x%hx crq_valid:%x\n", |
993 | vscsi->flags, vscsi->state, (int)crq->valid); | |
464fd641 MC |
994 | |
995 | if (!(vscsi->flags & PREP_FOR_SUSPEND_ABORTED) && !(crq->valid)) { | |
996 | rc = h_vioctl(vscsi->dds.unit_id, H_READY_FOR_SUSPEND, 0, 0, 0, | |
997 | 0, 0); | |
998 | if (rc) { | |
417dff6c BL |
999 | dev_err(&vscsi->dev, "Ready for Suspend Vioctl failed: %ld\n", |
1000 | rc); | |
464fd641 MC |
1001 | rc = 0; |
1002 | } | |
1003 | } else if (((vscsi->flags & PREP_FOR_SUSPEND_OVERWRITE) && | |
1004 | (vscsi->flags & PREP_FOR_SUSPEND_ABORTED)) || | |
1005 | ((crq->valid) && ((crq->valid != VALID_TRANS_EVENT) || | |
1006 | (crq->format != RESUME_FROM_SUSP)))) { | |
1007 | if (idle) { | |
1008 | vscsi->state = ERR_DISCONNECT_RECONNECT; | |
1009 | ibmvscsis_reset_queue(vscsi); | |
1010 | rc = -1; | |
1011 | } else if (vscsi->state == CONNECTED) { | |
1012 | ibmvscsis_post_disconnect(vscsi, | |
1013 | ERR_DISCONNECT_RECONNECT, 0); | |
1014 | } | |
1015 | ||
1016 | vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE; | |
1017 | ||
1018 | if ((crq->valid) && ((crq->valid != VALID_TRANS_EVENT) || | |
1019 | (crq->format != RESUME_FROM_SUSP))) | |
417dff6c | 1020 | dev_err(&vscsi->dev, "Invalid element in CRQ after Prepare for Suspend"); |
464fd641 MC |
1021 | } |
1022 | ||
1023 | vscsi->flags &= ~(PREP_FOR_SUSPEND_PENDING | PREP_FOR_SUSPEND_ABORTED); | |
1024 | ||
1025 | return rc; | |
1026 | } | |
1027 | ||
88a678bb BL |
1028 | /** |
1029 | * ibmvscsis_trans_event() - Handle a Transport Event | |
1030 | * @vscsi: Pointer to our adapter structure | |
1031 | * @crq: Pointer to CRQ entry containing the Transport Event | |
1032 | * | |
1033 | * Do the logic to close the I_T nexus. This function may not | |
1034 | * behave to specification. | |
1035 | * | |
1036 | * EXECUTION ENVIRONMENT: | |
1037 | * Interrupt, interrupt lock held | |
1038 | */ | |
1039 | static long ibmvscsis_trans_event(struct scsi_info *vscsi, | |
1040 | struct viosrp_crq *crq) | |
1041 | { | |
1042 | long rc = ADAPT_SUCCESS; | |
1043 | ||
417dff6c BL |
1044 | dev_dbg(&vscsi->dev, "trans_event: format %d, flags 0x%x, state 0x%hx\n", |
1045 | (int)crq->format, vscsi->flags, vscsi->state); | |
88a678bb BL |
1046 | |
1047 | switch (crq->format) { | |
1048 | case MIGRATED: | |
1049 | case PARTNER_FAILED: | |
1050 | case PARTNER_DEREGISTER: | |
1051 | ibmvscsis_delete_client_info(vscsi, true); | |
464fd641 MC |
1052 | if (crq->format == MIGRATED) |
1053 | vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE; | |
88a678bb BL |
1054 | switch (vscsi->state) { |
1055 | case NO_QUEUE: | |
1056 | case ERR_DISCONNECTED: | |
1057 | case UNDEFINED: | |
1058 | break; | |
1059 | ||
1060 | case UNCONFIGURING: | |
1061 | vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT); | |
1062 | break; | |
1063 | ||
1064 | case WAIT_ENABLED: | |
1065 | break; | |
1066 | ||
1067 | case WAIT_CONNECTION: | |
1068 | break; | |
1069 | ||
1070 | case CONNECTED: | |
1071 | ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, | |
1072 | (RESPONSE_Q_DOWN | | |
1073 | TRANS_EVENT)); | |
1074 | break; | |
1075 | ||
88a678bb BL |
1076 | case SRP_PROCESSING: |
1077 | if ((vscsi->debit > 0) || | |
1078 | !list_empty(&vscsi->schedule_q) || | |
1079 | !list_empty(&vscsi->waiting_rsp) || | |
1080 | !list_empty(&vscsi->active_q)) { | |
417dff6c BL |
1081 | dev_dbg(&vscsi->dev, "debit %d, sched %d, wait %d, active %d\n", |
1082 | vscsi->debit, | |
1083 | (int)list_empty(&vscsi->schedule_q), | |
1084 | (int)list_empty(&vscsi->waiting_rsp), | |
1085 | (int)list_empty(&vscsi->active_q)); | |
1086 | dev_warn(&vscsi->dev, "connection lost with outstanding work\n"); | |
88a678bb | 1087 | } else { |
417dff6c | 1088 | dev_dbg(&vscsi->dev, "trans_event: SRP Processing, but no outstanding work\n"); |
88a678bb BL |
1089 | } |
1090 | ||
1091 | ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, | |
1092 | (RESPONSE_Q_DOWN | | |
1093 | TRANS_EVENT)); | |
1094 | break; | |
1095 | ||
1096 | case ERR_DISCONNECT: | |
1097 | case ERR_DISCONNECT_RECONNECT: | |
1098 | case WAIT_IDLE: | |
1099 | vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT); | |
1100 | break; | |
1101 | } | |
464fd641 MC |
1102 | break; |
1103 | ||
1104 | case PREPARE_FOR_SUSPEND: | |
417dff6c BL |
1105 | dev_dbg(&vscsi->dev, "Prep for Suspend, crq status = 0x%x\n", |
1106 | (int)crq->status); | |
464fd641 MC |
1107 | switch (vscsi->state) { |
1108 | case ERR_DISCONNECTED: | |
1109 | case WAIT_CONNECTION: | |
1110 | case CONNECTED: | |
1111 | ibmvscsis_ready_for_suspend(vscsi, false); | |
1112 | break; | |
1113 | case SRP_PROCESSING: | |
1114 | vscsi->resume_state = vscsi->state; | |
1115 | vscsi->flags |= PREP_FOR_SUSPEND_PENDING; | |
1116 | if (crq->status == CRQ_ENTRY_OVERWRITTEN) | |
1117 | vscsi->flags |= PREP_FOR_SUSPEND_OVERWRITE; | |
1118 | ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0); | |
1119 | break; | |
1120 | case NO_QUEUE: | |
1121 | case UNDEFINED: | |
1122 | case UNCONFIGURING: | |
1123 | case WAIT_ENABLED: | |
1124 | case ERR_DISCONNECT: | |
1125 | case ERR_DISCONNECT_RECONNECT: | |
1126 | case WAIT_IDLE: | |
417dff6c BL |
1127 | dev_err(&vscsi->dev, "Invalid state for Prepare for Suspend Trans Event: 0x%x\n", |
1128 | vscsi->state); | |
464fd641 MC |
1129 | break; |
1130 | } | |
1131 | break; | |
1132 | ||
1133 | case RESUME_FROM_SUSP: | |
417dff6c BL |
1134 | dev_dbg(&vscsi->dev, "Resume from Suspend, crq status = 0x%x\n", |
1135 | (int)crq->status); | |
464fd641 MC |
1136 | if (vscsi->flags & PREP_FOR_SUSPEND_PENDING) { |
1137 | vscsi->flags |= PREP_FOR_SUSPEND_ABORTED; | |
1138 | } else { | |
1139 | if ((crq->status == CRQ_ENTRY_OVERWRITTEN) || | |
1140 | (vscsi->flags & PREP_FOR_SUSPEND_OVERWRITE)) { | |
1141 | ibmvscsis_post_disconnect(vscsi, | |
1142 | ERR_DISCONNECT_RECONNECT, | |
1143 | 0); | |
1144 | vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE; | |
1145 | } | |
1146 | } | |
1147 | break; | |
1148 | ||
1149 | default: | |
1150 | rc = ERROR; | |
1151 | dev_err(&vscsi->dev, "trans_event: invalid format %d\n", | |
1152 | (uint)crq->format); | |
1153 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, | |
1154 | RESPONSE_Q_DOWN); | |
1155 | break; | |
88a678bb BL |
1156 | } |
1157 | ||
79fac9c9 | 1158 | rc = vscsi->flags & SCHEDULE_DISCONNECT; |
88a678bb | 1159 | |
417dff6c BL |
1160 | dev_dbg(&vscsi->dev, "Leaving trans_event: flags 0x%x, state 0x%hx, rc %ld\n", |
1161 | vscsi->flags, vscsi->state, rc); | |
88a678bb BL |
1162 | |
1163 | return rc; | |
1164 | } | |
1165 | ||
1166 | /** | |
1167 | * ibmvscsis_poll_cmd_q() - Poll Command Queue | |
1168 | * @vscsi: Pointer to our adapter structure | |
1169 | * | |
1170 | * Called to handle command elements that may have arrived while | |
1171 | * interrupts were disabled. | |
1172 | * | |
1173 | * EXECUTION ENVIRONMENT: | |
1174 | * intr_lock must be held | |
1175 | */ | |
1176 | static void ibmvscsis_poll_cmd_q(struct scsi_info *vscsi) | |
1177 | { | |
1178 | struct viosrp_crq *crq; | |
1179 | long rc; | |
1180 | bool ack = true; | |
1181 | volatile u8 valid; | |
1182 | ||
417dff6c BL |
1183 | dev_dbg(&vscsi->dev, "poll_cmd_q: flags 0x%x, state 0x%hx, q index %ud\n", |
1184 | vscsi->flags, vscsi->state, vscsi->cmd_q.index); | |
88a678bb BL |
1185 | |
1186 | rc = vscsi->flags & SCHEDULE_DISCONNECT; | |
1187 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
1188 | valid = crq->valid; | |
1189 | dma_rmb(); | |
1190 | ||
1191 | while (valid) { | |
1192 | poll_work: | |
1193 | vscsi->cmd_q.index = | |
1194 | (vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask; | |
1195 | ||
1196 | if (!rc) { | |
1197 | rc = ibmvscsis_parse_command(vscsi, crq); | |
1198 | } else { | |
1199 | if ((uint)crq->valid == VALID_TRANS_EVENT) { | |
1200 | /* | |
1201 | * must service the transport layer events even | |
1202 | * in an error state, dont break out until all | |
1203 | * the consecutive transport events have been | |
1204 | * processed | |
1205 | */ | |
1206 | rc = ibmvscsis_trans_event(vscsi, crq); | |
1207 | } else if (vscsi->flags & TRANS_EVENT) { | |
1208 | /* | |
1209 | * if a tranport event has occurred leave | |
1210 | * everything but transport events on the queue | |
1211 | */ | |
417dff6c | 1212 | dev_dbg(&vscsi->dev, "poll_cmd_q, ignoring\n"); |
88a678bb BL |
1213 | |
1214 | /* | |
1215 | * need to decrement the queue index so we can | |
1216 | * look at the elment again | |
1217 | */ | |
1218 | if (vscsi->cmd_q.index) | |
1219 | vscsi->cmd_q.index -= 1; | |
1220 | else | |
1221 | /* | |
1222 | * index is at 0 it just wrapped. | |
1223 | * have it index last element in q | |
1224 | */ | |
1225 | vscsi->cmd_q.index = vscsi->cmd_q.mask; | |
1226 | break; | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | crq->valid = INVALIDATE_CMD_RESP_EL; | |
1231 | ||
1232 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
1233 | valid = crq->valid; | |
1234 | dma_rmb(); | |
1235 | } | |
1236 | ||
1237 | if (!rc) { | |
1238 | if (ack) { | |
1239 | vio_enable_interrupts(vscsi->dma_dev); | |
1240 | ack = false; | |
417dff6c | 1241 | dev_dbg(&vscsi->dev, "poll_cmd_q, reenabling interrupts\n"); |
88a678bb BL |
1242 | } |
1243 | valid = crq->valid; | |
1244 | dma_rmb(); | |
1245 | if (valid) | |
1246 | goto poll_work; | |
1247 | } | |
1248 | ||
417dff6c | 1249 | dev_dbg(&vscsi->dev, "Leaving poll_cmd_q: rc %ld\n", rc); |
88a678bb BL |
1250 | } |
1251 | ||
1252 | /** | |
1253 | * ibmvscsis_free_cmd_qs() - Free elements in queue | |
1254 | * @vscsi: Pointer to our adapter structure | |
1255 | * | |
1256 | * Free all of the elements on all queues that are waiting for | |
1257 | * whatever reason. | |
1258 | * | |
1259 | * PRECONDITION: | |
1260 | * Called with interrupt lock held | |
1261 | */ | |
1262 | static void ibmvscsis_free_cmd_qs(struct scsi_info *vscsi) | |
1263 | { | |
1264 | struct ibmvscsis_cmd *cmd, *nxt; | |
1265 | ||
417dff6c BL |
1266 | dev_dbg(&vscsi->dev, "free_cmd_qs: waiting_rsp empty %d, timer starter %d\n", |
1267 | (int)list_empty(&vscsi->waiting_rsp), | |
1268 | vscsi->rsp_q_timer.started); | |
88a678bb BL |
1269 | |
1270 | list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp, list) { | |
1271 | list_del(&cmd->list); | |
1272 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
1273 | } | |
1274 | } | |
1275 | ||
1276 | /** | |
1277 | * ibmvscsis_get_free_cmd() - Get free command from list | |
1278 | * @vscsi: Pointer to our adapter structure | |
1279 | * | |
1280 | * Must be called with interrupt lock held. | |
1281 | */ | |
1282 | static struct ibmvscsis_cmd *ibmvscsis_get_free_cmd(struct scsi_info *vscsi) | |
1283 | { | |
1284 | struct ibmvscsis_cmd *cmd = NULL; | |
1285 | struct iu_entry *iue; | |
1286 | ||
1287 | iue = srp_iu_get(&vscsi->target); | |
1288 | if (iue) { | |
1289 | cmd = list_first_entry_or_null(&vscsi->free_cmd, | |
1290 | struct ibmvscsis_cmd, list); | |
1291 | if (cmd) { | |
98883f1b BL |
1292 | if (cmd->abort_cmd) |
1293 | cmd->abort_cmd = NULL; | |
25e78531 | 1294 | cmd->flags &= ~(DELAY_SEND); |
88a678bb BL |
1295 | list_del(&cmd->list); |
1296 | cmd->iue = iue; | |
1297 | cmd->type = UNSET_TYPE; | |
1298 | memset(&cmd->se_cmd, 0, sizeof(cmd->se_cmd)); | |
1299 | } else { | |
1300 | srp_iu_put(iue); | |
1301 | } | |
1302 | } | |
1303 | ||
1304 | return cmd; | |
1305 | } | |
1306 | ||
1307 | /** | |
1308 | * ibmvscsis_adapter_idle() - Helper function to handle idle adapter | |
1309 | * @vscsi: Pointer to our adapter structure | |
1310 | * | |
1311 | * This function is called when the adapter is idle when the driver | |
1312 | * is attempting to clear an error condition. | |
1313 | * The adapter is considered busy if any of its cmd queues | |
1314 | * are non-empty. This function can be invoked | |
1315 | * from the off level disconnect function. | |
1316 | * | |
1317 | * EXECUTION ENVIRONMENT: | |
1318 | * Process environment called with interrupt lock held | |
1319 | */ | |
1320 | static void ibmvscsis_adapter_idle(struct scsi_info *vscsi) | |
1321 | { | |
1322 | int free_qs = false; | |
464fd641 | 1323 | long rc = 0; |
88a678bb | 1324 | |
417dff6c BL |
1325 | dev_dbg(&vscsi->dev, "adapter_idle: flags 0x%x, state 0x%hx\n", |
1326 | vscsi->flags, vscsi->state); | |
88a678bb BL |
1327 | |
1328 | /* Only need to free qs if we're disconnecting from client */ | |
1329 | if (vscsi->state != WAIT_CONNECTION || vscsi->flags & TRANS_EVENT) | |
1330 | free_qs = true; | |
1331 | ||
1332 | switch (vscsi->state) { | |
8bf11557 MC |
1333 | case UNCONFIGURING: |
1334 | ibmvscsis_free_command_q(vscsi); | |
1335 | dma_rmb(); | |
1336 | isync(); | |
1337 | if (vscsi->flags & CFG_SLEEPING) { | |
1338 | vscsi->flags &= ~CFG_SLEEPING; | |
1339 | complete(&vscsi->unconfig); | |
1340 | } | |
1341 | break; | |
88a678bb | 1342 | case ERR_DISCONNECT_RECONNECT: |
c9b3379f | 1343 | ibmvscsis_reset_queue(vscsi); |
417dff6c BL |
1344 | dev_dbg(&vscsi->dev, "adapter_idle, disc_rec: flags 0x%x\n", |
1345 | vscsi->flags); | |
88a678bb BL |
1346 | break; |
1347 | ||
1348 | case ERR_DISCONNECT: | |
1349 | ibmvscsis_free_command_q(vscsi); | |
c9b3379f | 1350 | vscsi->flags &= ~(SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED); |
88a678bb | 1351 | vscsi->flags |= RESPONSE_Q_DOWN; |
c9b3379f MC |
1352 | if (vscsi->tport.enabled) |
1353 | vscsi->state = ERR_DISCONNECTED; | |
1354 | else | |
1355 | vscsi->state = WAIT_ENABLED; | |
417dff6c BL |
1356 | dev_dbg(&vscsi->dev, "adapter_idle, disc: flags 0x%x, state 0x%hx\n", |
1357 | vscsi->flags, vscsi->state); | |
88a678bb BL |
1358 | break; |
1359 | ||
1360 | case WAIT_IDLE: | |
1361 | vscsi->rsp_q_timer.timer_pops = 0; | |
1362 | vscsi->debit = 0; | |
1363 | vscsi->credit = 0; | |
464fd641 MC |
1364 | if (vscsi->flags & PREP_FOR_SUSPEND_PENDING) { |
1365 | vscsi->state = vscsi->resume_state; | |
1366 | vscsi->resume_state = 0; | |
1367 | rc = ibmvscsis_ready_for_suspend(vscsi, true); | |
1368 | vscsi->flags &= ~DISCONNECT_SCHEDULED; | |
1369 | if (rc) | |
1370 | break; | |
1371 | } else if (vscsi->flags & TRANS_EVENT) { | |
88a678bb BL |
1372 | vscsi->state = WAIT_CONNECTION; |
1373 | vscsi->flags &= PRESERVE_FLAG_FIELDS; | |
1374 | } else { | |
1375 | vscsi->state = CONNECTED; | |
1376 | vscsi->flags &= ~DISCONNECT_SCHEDULED; | |
1377 | } | |
1378 | ||
417dff6c BL |
1379 | dev_dbg(&vscsi->dev, "adapter_idle, wait: flags 0x%x, state 0x%hx\n", |
1380 | vscsi->flags, vscsi->state); | |
88a678bb BL |
1381 | ibmvscsis_poll_cmd_q(vscsi); |
1382 | break; | |
1383 | ||
1384 | case ERR_DISCONNECTED: | |
1385 | vscsi->flags &= ~DISCONNECT_SCHEDULED; | |
417dff6c BL |
1386 | dev_dbg(&vscsi->dev, "adapter_idle, disconnected: flags 0x%x, state 0x%hx\n", |
1387 | vscsi->flags, vscsi->state); | |
88a678bb BL |
1388 | break; |
1389 | ||
1390 | default: | |
1391 | dev_err(&vscsi->dev, "adapter_idle: in invalid state %d\n", | |
1392 | vscsi->state); | |
1393 | break; | |
1394 | } | |
1395 | ||
1396 | if (free_qs) | |
1397 | ibmvscsis_free_cmd_qs(vscsi); | |
1398 | ||
1399 | /* | |
1400 | * There is a timing window where we could lose a disconnect request. | |
1401 | * The known path to this window occurs during the DISCONNECT_RECONNECT | |
1402 | * case above: reset_queue calls free_command_q, which will release the | |
1403 | * interrupt lock. During that time, a new post_disconnect call can be | |
1404 | * made with a "more severe" state (DISCONNECT or UNCONFIGURING). | |
1405 | * Because the DISCONNECT_SCHEDULED flag is already set, post_disconnect | |
1406 | * will only set the new_state. Now free_command_q reacquires the intr | |
1407 | * lock and clears the DISCONNECT_SCHEDULED flag (using PRESERVE_FLAG_ | |
1408 | * FIELDS), and the disconnect is lost. This is particularly bad when | |
1409 | * the new disconnect was for UNCONFIGURING, since the unconfigure hangs | |
1410 | * forever. | |
1411 | * Fix is that free command queue sets acr state and acr flags if there | |
1412 | * is a change under the lock | |
1413 | * note free command queue writes to this state it clears it | |
1414 | * before releasing the lock, different drivers call the free command | |
1415 | * queue different times so dont initialize above | |
1416 | */ | |
1417 | if (vscsi->phyp_acr_state != 0) { | |
1418 | /* | |
1419 | * set any bits in flags that may have been cleared by | |
1420 | * a call to free command queue in switch statement | |
1421 | * or reset queue | |
1422 | */ | |
1423 | vscsi->flags |= vscsi->phyp_acr_flags; | |
1424 | ibmvscsis_post_disconnect(vscsi, vscsi->phyp_acr_state, 0); | |
1425 | vscsi->phyp_acr_state = 0; | |
1426 | vscsi->phyp_acr_flags = 0; | |
1427 | ||
417dff6c BL |
1428 | dev_dbg(&vscsi->dev, "adapter_idle: flags 0x%x, state 0x%hx, acr_flags 0x%x, acr_state 0x%hx\n", |
1429 | vscsi->flags, vscsi->state, vscsi->phyp_acr_flags, | |
1430 | vscsi->phyp_acr_state); | |
88a678bb BL |
1431 | } |
1432 | ||
417dff6c BL |
1433 | dev_dbg(&vscsi->dev, "Leaving adapter_idle: flags 0x%x, state 0x%hx, new_state 0x%x\n", |
1434 | vscsi->flags, vscsi->state, vscsi->new_state); | |
88a678bb BL |
1435 | } |
1436 | ||
1437 | /** | |
1438 | * ibmvscsis_copy_crq_packet() - Copy CRQ Packet | |
1439 | * @vscsi: Pointer to our adapter structure | |
1440 | * @cmd: Pointer to command element to use to process the request | |
1441 | * @crq: Pointer to CRQ entry containing the request | |
1442 | * | |
1443 | * Copy the srp information unit from the hosted | |
1444 | * partition using remote dma | |
1445 | * | |
1446 | * EXECUTION ENVIRONMENT: | |
1447 | * Interrupt, interrupt lock held | |
1448 | */ | |
1449 | static long ibmvscsis_copy_crq_packet(struct scsi_info *vscsi, | |
1450 | struct ibmvscsis_cmd *cmd, | |
1451 | struct viosrp_crq *crq) | |
1452 | { | |
1453 | struct iu_entry *iue = cmd->iue; | |
1454 | long rc = 0; | |
1455 | u16 len; | |
1456 | ||
1457 | len = be16_to_cpu(crq->IU_length); | |
1458 | if ((len > SRP_MAX_IU_LEN) || (len == 0)) { | |
1459 | dev_err(&vscsi->dev, "copy_crq: Invalid len %d passed", len); | |
1460 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
1461 | return SRP_VIOLATION; | |
1462 | } | |
1463 | ||
1464 | rc = h_copy_rdma(len, vscsi->dds.window[REMOTE].liobn, | |
1465 | be64_to_cpu(crq->IU_data_ptr), | |
1466 | vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma); | |
1467 | ||
1468 | switch (rc) { | |
1469 | case H_SUCCESS: | |
1470 | cmd->init_time = mftb(); | |
1471 | iue->remote_token = crq->IU_data_ptr; | |
1472 | iue->iu_len = len; | |
417dff6c BL |
1473 | dev_dbg(&vscsi->dev, "copy_crq: ioba 0x%llx, init_time 0x%llx\n", |
1474 | be64_to_cpu(crq->IU_data_ptr), cmd->init_time); | |
88a678bb BL |
1475 | break; |
1476 | case H_PERMISSION: | |
1477 | if (connection_broken(vscsi)) | |
1478 | ibmvscsis_post_disconnect(vscsi, | |
1479 | ERR_DISCONNECT_RECONNECT, | |
1480 | (RESPONSE_Q_DOWN | | |
1481 | CLIENT_FAILED)); | |
1482 | else | |
1483 | ibmvscsis_post_disconnect(vscsi, | |
1484 | ERR_DISCONNECT_RECONNECT, 0); | |
1485 | ||
1486 | dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n", | |
1487 | rc); | |
1488 | break; | |
1489 | case H_DEST_PARM: | |
1490 | case H_SOURCE_PARM: | |
1491 | default: | |
1492 | dev_err(&vscsi->dev, "copy_crq: h_copy_rdma failed, rc %ld\n", | |
1493 | rc); | |
1494 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
1495 | break; | |
1496 | } | |
1497 | ||
1498 | return rc; | |
1499 | } | |
1500 | ||
1501 | /** | |
1502 | * ibmvscsis_adapter_info - Service an Adapter Info MAnagement Data gram | |
1503 | * @vscsi: Pointer to our adapter structure | |
1504 | * @iue: Information Unit containing the Adapter Info MAD request | |
1505 | * | |
1506 | * EXECUTION ENVIRONMENT: | |
79fac9c9 | 1507 | * Interrupt adapter lock is held |
88a678bb BL |
1508 | */ |
1509 | static long ibmvscsis_adapter_info(struct scsi_info *vscsi, | |
1510 | struct iu_entry *iue) | |
1511 | { | |
1512 | struct viosrp_adapter_info *mad = &vio_iu(iue)->mad.adapter_info; | |
1513 | struct mad_adapter_info_data *info; | |
1514 | uint flag_bits = 0; | |
1515 | dma_addr_t token; | |
1516 | long rc; | |
1517 | ||
1518 | mad->common.status = cpu_to_be16(VIOSRP_MAD_SUCCESS); | |
1519 | ||
1520 | if (be16_to_cpu(mad->common.length) > sizeof(*info)) { | |
1521 | mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1522 | return 0; | |
1523 | } | |
1524 | ||
1525 | info = dma_alloc_coherent(&vscsi->dma_dev->dev, sizeof(*info), &token, | |
a5b0e406 | 1526 | GFP_ATOMIC); |
88a678bb BL |
1527 | if (!info) { |
1528 | dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n", | |
1529 | iue->target); | |
1530 | mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1531 | return 0; | |
1532 | } | |
1533 | ||
1534 | /* Get remote info */ | |
1535 | rc = h_copy_rdma(be16_to_cpu(mad->common.length), | |
1536 | vscsi->dds.window[REMOTE].liobn, | |
1537 | be64_to_cpu(mad->buffer), | |
1538 | vscsi->dds.window[LOCAL].liobn, token); | |
1539 | ||
1540 | if (rc != H_SUCCESS) { | |
1541 | if (rc == H_PERMISSION) { | |
1542 | if (connection_broken(vscsi)) | |
1543 | flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED); | |
1544 | } | |
417dff6c BL |
1545 | dev_warn(&vscsi->dev, "adapter_info: h_copy_rdma from client failed, rc %ld\n", |
1546 | rc); | |
1547 | dev_dbg(&vscsi->dev, "adapter_info: ioba 0x%llx, flags 0x%x, flag_bits 0x%x\n", | |
1548 | be64_to_cpu(mad->buffer), vscsi->flags, flag_bits); | |
88a678bb BL |
1549 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, |
1550 | flag_bits); | |
1551 | goto free_dma; | |
1552 | } | |
1553 | ||
1554 | /* | |
1555 | * Copy client info, but ignore partition number, which we | |
1556 | * already got from phyp - unless we failed to get it from | |
1557 | * phyp (e.g. if we're running on a p5 system). | |
1558 | */ | |
1559 | if (vscsi->client_data.partition_number == 0) | |
1560 | vscsi->client_data.partition_number = | |
1561 | be32_to_cpu(info->partition_number); | |
1562 | strncpy(vscsi->client_data.srp_version, info->srp_version, | |
1563 | sizeof(vscsi->client_data.srp_version)); | |
1564 | strncpy(vscsi->client_data.partition_name, info->partition_name, | |
1565 | sizeof(vscsi->client_data.partition_name)); | |
1566 | vscsi->client_data.mad_version = be32_to_cpu(info->mad_version); | |
1567 | vscsi->client_data.os_type = be32_to_cpu(info->os_type); | |
1568 | ||
1569 | /* Copy our info */ | |
1570 | strncpy(info->srp_version, SRP_VERSION, | |
1571 | sizeof(info->srp_version)); | |
1572 | strncpy(info->partition_name, vscsi->dds.partition_name, | |
1573 | sizeof(info->partition_name)); | |
1574 | info->partition_number = cpu_to_be32(vscsi->dds.partition_num); | |
1575 | info->mad_version = cpu_to_be32(MAD_VERSION_1); | |
1576 | info->os_type = cpu_to_be32(LINUX); | |
1577 | memset(&info->port_max_txu[0], 0, sizeof(info->port_max_txu)); | |
387b978c | 1578 | info->port_max_txu[0] = cpu_to_be32(MAX_TXU); |
88a678bb BL |
1579 | |
1580 | dma_wmb(); | |
1581 | rc = h_copy_rdma(sizeof(*info), vscsi->dds.window[LOCAL].liobn, | |
1582 | token, vscsi->dds.window[REMOTE].liobn, | |
1583 | be64_to_cpu(mad->buffer)); | |
1584 | switch (rc) { | |
1585 | case H_SUCCESS: | |
1586 | break; | |
1587 | ||
1588 | case H_SOURCE_PARM: | |
1589 | case H_DEST_PARM: | |
1590 | case H_PERMISSION: | |
1591 | if (connection_broken(vscsi)) | |
1592 | flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED); | |
1593 | default: | |
1594 | dev_err(&vscsi->dev, "adapter_info: h_copy_rdma to client failed, rc %ld\n", | |
1595 | rc); | |
1596 | ibmvscsis_post_disconnect(vscsi, | |
1597 | ERR_DISCONNECT_RECONNECT, | |
1598 | flag_bits); | |
1599 | break; | |
1600 | } | |
1601 | ||
1602 | free_dma: | |
1603 | dma_free_coherent(&vscsi->dma_dev->dev, sizeof(*info), info, token); | |
417dff6c | 1604 | dev_dbg(&vscsi->dev, "Leaving adapter_info, rc %ld\n", rc); |
88a678bb BL |
1605 | |
1606 | return rc; | |
1607 | } | |
1608 | ||
1609 | /** | |
1610 | * ibmvscsis_cap_mad() - Service a Capabilities MAnagement Data gram | |
1611 | * @vscsi: Pointer to our adapter structure | |
1612 | * @iue: Information Unit containing the Capabilities MAD request | |
1613 | * | |
1614 | * NOTE: if you return an error from this routine you must be | |
1615 | * disconnecting or you will cause a hang | |
1616 | * | |
1617 | * EXECUTION ENVIRONMENT: | |
1618 | * Interrupt called with adapter lock held | |
1619 | */ | |
1620 | static int ibmvscsis_cap_mad(struct scsi_info *vscsi, struct iu_entry *iue) | |
1621 | { | |
1622 | struct viosrp_capabilities *mad = &vio_iu(iue)->mad.capabilities; | |
1623 | struct capabilities *cap; | |
1624 | struct mad_capability_common *common; | |
1625 | dma_addr_t token; | |
1626 | u16 olen, len, status, min_len, cap_len; | |
1627 | u32 flag; | |
1628 | uint flag_bits = 0; | |
1629 | long rc = 0; | |
1630 | ||
1631 | olen = be16_to_cpu(mad->common.length); | |
1632 | /* | |
1633 | * struct capabilities hardcodes a couple capabilities after the | |
1634 | * header, but the capabilities can actually be in any order. | |
1635 | */ | |
1636 | min_len = offsetof(struct capabilities, migration); | |
1637 | if ((olen < min_len) || (olen > PAGE_SIZE)) { | |
417dff6c | 1638 | dev_warn(&vscsi->dev, "cap_mad: invalid len %d\n", olen); |
88a678bb BL |
1639 | mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); |
1640 | return 0; | |
1641 | } | |
1642 | ||
1643 | cap = dma_alloc_coherent(&vscsi->dma_dev->dev, olen, &token, | |
a5b0e406 | 1644 | GFP_ATOMIC); |
88a678bb BL |
1645 | if (!cap) { |
1646 | dev_err(&vscsi->dev, "bad dma_alloc_coherent %p\n", | |
1647 | iue->target); | |
1648 | mad->common.status = cpu_to_be16(VIOSRP_MAD_FAILED); | |
1649 | return 0; | |
1650 | } | |
1651 | rc = h_copy_rdma(olen, vscsi->dds.window[REMOTE].liobn, | |
1652 | be64_to_cpu(mad->buffer), | |
1653 | vscsi->dds.window[LOCAL].liobn, token); | |
1654 | if (rc == H_SUCCESS) { | |
1655 | strncpy(cap->name, dev_name(&vscsi->dma_dev->dev), | |
1656 | SRP_MAX_LOC_LEN); | |
1657 | ||
1658 | len = olen - min_len; | |
1659 | status = VIOSRP_MAD_SUCCESS; | |
1660 | common = (struct mad_capability_common *)&cap->migration; | |
1661 | ||
1662 | while ((len > 0) && (status == VIOSRP_MAD_SUCCESS) && !rc) { | |
417dff6c BL |
1663 | dev_dbg(&vscsi->dev, "cap_mad: len left %hd, cap type %d, cap len %hd\n", |
1664 | len, be32_to_cpu(common->cap_type), | |
1665 | be16_to_cpu(common->length)); | |
88a678bb BL |
1666 | |
1667 | cap_len = be16_to_cpu(common->length); | |
1668 | if (cap_len > len) { | |
1669 | dev_err(&vscsi->dev, "cap_mad: cap len mismatch with total len\n"); | |
1670 | status = VIOSRP_MAD_FAILED; | |
1671 | break; | |
1672 | } | |
1673 | ||
1674 | if (cap_len == 0) { | |
1675 | dev_err(&vscsi->dev, "cap_mad: cap len is 0\n"); | |
1676 | status = VIOSRP_MAD_FAILED; | |
1677 | break; | |
1678 | } | |
1679 | ||
1680 | switch (common->cap_type) { | |
1681 | default: | |
417dff6c | 1682 | dev_dbg(&vscsi->dev, "cap_mad: unsupported capability\n"); |
88a678bb BL |
1683 | common->server_support = 0; |
1684 | flag = cpu_to_be32((u32)CAP_LIST_SUPPORTED); | |
1685 | cap->flags &= ~flag; | |
1686 | break; | |
1687 | } | |
1688 | ||
1689 | len = len - cap_len; | |
1690 | common = (struct mad_capability_common *) | |
1691 | ((char *)common + cap_len); | |
1692 | } | |
1693 | ||
1694 | mad->common.status = cpu_to_be16(status); | |
1695 | ||
1696 | dma_wmb(); | |
1697 | rc = h_copy_rdma(olen, vscsi->dds.window[LOCAL].liobn, token, | |
1698 | vscsi->dds.window[REMOTE].liobn, | |
1699 | be64_to_cpu(mad->buffer)); | |
1700 | ||
1701 | if (rc != H_SUCCESS) { | |
417dff6c BL |
1702 | dev_dbg(&vscsi->dev, "cap_mad: failed to copy to client, rc %ld\n", |
1703 | rc); | |
88a678bb BL |
1704 | |
1705 | if (rc == H_PERMISSION) { | |
1706 | if (connection_broken(vscsi)) | |
1707 | flag_bits = (RESPONSE_Q_DOWN | | |
1708 | CLIENT_FAILED); | |
1709 | } | |
1710 | ||
417dff6c BL |
1711 | dev_warn(&vscsi->dev, "cap_mad: error copying data to client, rc %ld\n", |
1712 | rc); | |
88a678bb BL |
1713 | ibmvscsis_post_disconnect(vscsi, |
1714 | ERR_DISCONNECT_RECONNECT, | |
1715 | flag_bits); | |
1716 | } | |
1717 | } | |
1718 | ||
1719 | dma_free_coherent(&vscsi->dma_dev->dev, olen, cap, token); | |
1720 | ||
417dff6c BL |
1721 | dev_dbg(&vscsi->dev, "Leaving cap_mad, rc %ld, client_cap 0x%x\n", |
1722 | rc, vscsi->client_cap); | |
88a678bb BL |
1723 | |
1724 | return rc; | |
1725 | } | |
1726 | ||
1727 | /** | |
1728 | * ibmvscsis_process_mad() - Service a MAnagement Data gram | |
1729 | * @vscsi: Pointer to our adapter structure | |
1730 | * @iue: Information Unit containing the MAD request | |
1731 | * | |
1732 | * Must be called with interrupt lock held. | |
1733 | */ | |
1734 | static long ibmvscsis_process_mad(struct scsi_info *vscsi, struct iu_entry *iue) | |
1735 | { | |
1736 | struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad; | |
1737 | struct viosrp_empty_iu *empty; | |
1738 | long rc = ADAPT_SUCCESS; | |
1739 | ||
1740 | switch (be32_to_cpu(mad->type)) { | |
1741 | case VIOSRP_EMPTY_IU_TYPE: | |
1742 | empty = &vio_iu(iue)->mad.empty_iu; | |
1743 | vscsi->empty_iu_id = be64_to_cpu(empty->buffer); | |
1744 | vscsi->empty_iu_tag = be64_to_cpu(empty->common.tag); | |
1745 | mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS); | |
1746 | break; | |
1747 | case VIOSRP_ADAPTER_INFO_TYPE: | |
1748 | rc = ibmvscsis_adapter_info(vscsi, iue); | |
1749 | break; | |
1750 | case VIOSRP_CAPABILITIES_TYPE: | |
1751 | rc = ibmvscsis_cap_mad(vscsi, iue); | |
1752 | break; | |
1753 | case VIOSRP_ENABLE_FAST_FAIL: | |
1754 | if (vscsi->state == CONNECTED) { | |
1755 | vscsi->fast_fail = true; | |
1756 | mad->status = cpu_to_be16(VIOSRP_MAD_SUCCESS); | |
1757 | } else { | |
417dff6c | 1758 | dev_warn(&vscsi->dev, "fast fail mad sent after login\n"); |
88a678bb BL |
1759 | mad->status = cpu_to_be16(VIOSRP_MAD_FAILED); |
1760 | } | |
1761 | break; | |
1762 | default: | |
1763 | mad->status = cpu_to_be16(VIOSRP_MAD_NOT_SUPPORTED); | |
1764 | break; | |
1765 | } | |
1766 | ||
1767 | return rc; | |
1768 | } | |
1769 | ||
1770 | /** | |
1771 | * srp_snd_msg_failed() - Handle an error when sending a response | |
1772 | * @vscsi: Pointer to our adapter structure | |
1773 | * @rc: The return code from the h_send_crq command | |
1774 | * | |
1775 | * Must be called with interrupt lock held. | |
1776 | */ | |
1777 | static void srp_snd_msg_failed(struct scsi_info *vscsi, long rc) | |
1778 | { | |
1779 | ktime_t kt; | |
1780 | ||
1781 | if (rc != H_DROPPED) { | |
1782 | ibmvscsis_free_cmd_qs(vscsi); | |
1783 | ||
1784 | if (rc == H_CLOSED) | |
1785 | vscsi->flags |= CLIENT_FAILED; | |
1786 | ||
1787 | /* don't flag the same problem multiple times */ | |
1788 | if (!(vscsi->flags & RESPONSE_Q_DOWN)) { | |
1789 | vscsi->flags |= RESPONSE_Q_DOWN; | |
1790 | if (!(vscsi->state & (ERR_DISCONNECT | | |
1791 | ERR_DISCONNECT_RECONNECT | | |
1792 | ERR_DISCONNECTED | UNDEFINED))) { | |
1793 | dev_err(&vscsi->dev, "snd_msg_failed: setting RESPONSE_Q_DOWN, state 0x%hx, flags 0x%x, rc %ld\n", | |
1794 | vscsi->state, vscsi->flags, rc); | |
1795 | } | |
1796 | ibmvscsis_post_disconnect(vscsi, | |
1797 | ERR_DISCONNECT_RECONNECT, 0); | |
1798 | } | |
1799 | return; | |
1800 | } | |
1801 | ||
1802 | /* | |
1803 | * The response queue is full. | |
1804 | * If the server is processing SRP requests, i.e. | |
1805 | * the client has successfully done an | |
1806 | * SRP_LOGIN, then it will wait forever for room in | |
1807 | * the queue. However if the system admin | |
1808 | * is attempting to unconfigure the server then one | |
1809 | * or more children will be in a state where | |
1810 | * they are being removed. So if there is even one | |
1811 | * child being removed then the driver assumes | |
1812 | * the system admin is attempting to break the | |
1813 | * connection with the client and MAX_TIMER_POPS | |
1814 | * is honored. | |
1815 | */ | |
1816 | if ((vscsi->rsp_q_timer.timer_pops < MAX_TIMER_POPS) || | |
1817 | (vscsi->state == SRP_PROCESSING)) { | |
417dff6c BL |
1818 | dev_dbg(&vscsi->dev, "snd_msg_failed: response queue full, flags 0x%x, timer started %d, pops %d\n", |
1819 | vscsi->flags, (int)vscsi->rsp_q_timer.started, | |
1820 | vscsi->rsp_q_timer.timer_pops); | |
88a678bb BL |
1821 | |
1822 | /* | |
1823 | * Check if the timer is running; if it | |
1824 | * is not then start it up. | |
1825 | */ | |
1826 | if (!vscsi->rsp_q_timer.started) { | |
1827 | if (vscsi->rsp_q_timer.timer_pops < | |
1828 | MAX_TIMER_POPS) { | |
8b0e1953 | 1829 | kt = WAIT_NANO_SECONDS; |
88a678bb BL |
1830 | } else { |
1831 | /* | |
1832 | * slide the timeslice if the maximum | |
1833 | * timer pops have already happened | |
1834 | */ | |
1835 | kt = ktime_set(WAIT_SECONDS, 0); | |
1836 | } | |
1837 | ||
1838 | vscsi->rsp_q_timer.started = true; | |
1839 | hrtimer_start(&vscsi->rsp_q_timer.timer, kt, | |
1840 | HRTIMER_MODE_REL); | |
1841 | } | |
1842 | } else { | |
1843 | /* | |
1844 | * TBD: Do we need to worry about this? Need to get | |
1845 | * remove working. | |
1846 | */ | |
1847 | /* | |
1848 | * waited a long time and it appears the system admin | |
1849 | * is bring this driver down | |
1850 | */ | |
1851 | vscsi->flags |= RESPONSE_Q_DOWN; | |
1852 | ibmvscsis_free_cmd_qs(vscsi); | |
1853 | /* | |
1854 | * if the driver is already attempting to disconnect | |
1855 | * from the client and has already logged an error | |
1856 | * trace this event but don't put it in the error log | |
1857 | */ | |
1858 | if (!(vscsi->state & (ERR_DISCONNECT | | |
1859 | ERR_DISCONNECT_RECONNECT | | |
1860 | ERR_DISCONNECTED | UNDEFINED))) { | |
1861 | dev_err(&vscsi->dev, "client crq full too long\n"); | |
1862 | ibmvscsis_post_disconnect(vscsi, | |
1863 | ERR_DISCONNECT_RECONNECT, | |
1864 | 0); | |
1865 | } | |
1866 | } | |
1867 | } | |
1868 | ||
1869 | /** | |
1870 | * ibmvscsis_send_messages() - Send a Response | |
1871 | * @vscsi: Pointer to our adapter structure | |
1872 | * | |
1873 | * Send a response, first checking the waiting queue. Responses are | |
1874 | * sent in order they are received. If the response cannot be sent, | |
1875 | * because the client queue is full, it stays on the waiting queue. | |
1876 | * | |
1877 | * PRECONDITION: | |
1878 | * Called with interrupt lock held | |
1879 | */ | |
1880 | static void ibmvscsis_send_messages(struct scsi_info *vscsi) | |
1881 | { | |
1882 | u64 msg_hi = 0; | |
25e78531 | 1883 | /* note do not attempt to access the IU_data_ptr with this pointer |
88a678bb BL |
1884 | * it is not valid |
1885 | */ | |
1886 | struct viosrp_crq *crq = (struct viosrp_crq *)&msg_hi; | |
1887 | struct ibmvscsis_cmd *cmd, *nxt; | |
1888 | struct iu_entry *iue; | |
1889 | long rc = ADAPT_SUCCESS; | |
25e78531 | 1890 | bool retry = false; |
88a678bb BL |
1891 | |
1892 | if (!(vscsi->flags & RESPONSE_Q_DOWN)) { | |
25e78531 BL |
1893 | do { |
1894 | retry = false; | |
1895 | list_for_each_entry_safe(cmd, nxt, &vscsi->waiting_rsp, | |
1896 | list) { | |
1897 | /* | |
1898 | * Check to make sure abort cmd gets processed | |
1899 | * prior to the abort tmr cmd | |
1900 | */ | |
1901 | if (cmd->flags & DELAY_SEND) | |
1902 | continue; | |
88a678bb | 1903 | |
25e78531 BL |
1904 | if (cmd->abort_cmd) { |
1905 | retry = true; | |
1906 | cmd->abort_cmd->flags &= ~(DELAY_SEND); | |
98883f1b | 1907 | cmd->abort_cmd = NULL; |
25e78531 | 1908 | } |
88a678bb | 1909 | |
25e78531 BL |
1910 | /* |
1911 | * If CMD_T_ABORTED w/o CMD_T_TAS scenarios and | |
1912 | * the case where LIO issued a | |
1913 | * ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST | |
1914 | * case then we dont send a response, since it | |
1915 | * was already done. | |
1916 | */ | |
1917 | if (cmd->se_cmd.transport_state & CMD_T_ABORTED && | |
1918 | !(cmd->se_cmd.transport_state & CMD_T_TAS)) { | |
1919 | list_del(&cmd->list); | |
1920 | ibmvscsis_free_cmd_resources(vscsi, | |
1921 | cmd); | |
75dbf2d3 BL |
1922 | /* |
1923 | * With a successfully aborted op | |
1924 | * through LIO we want to increment the | |
1925 | * the vscsi credit so that when we dont | |
1926 | * send a rsp to the original scsi abort | |
1927 | * op (h_send_crq), but the tm rsp to | |
1928 | * the abort is sent, the credit is | |
1929 | * correctly sent with the abort tm rsp. | |
1930 | * We would need 1 for the abort tm rsp | |
1931 | * and 1 credit for the aborted scsi op. | |
1932 | * Thus we need to increment here. | |
1933 | * Also we want to increment the credit | |
1934 | * here because we want to make sure | |
1935 | * cmd is actually released first | |
1936 | * otherwise the client will think it | |
1937 | * it can send a new cmd, and we could | |
1938 | * find ourselves short of cmd elements. | |
1939 | */ | |
1940 | vscsi->credit += 1; | |
25e78531 BL |
1941 | } else { |
1942 | iue = cmd->iue; | |
88a678bb | 1943 | |
25e78531 BL |
1944 | crq->valid = VALID_CMD_RESP_EL; |
1945 | crq->format = cmd->rsp.format; | |
88a678bb | 1946 | |
25e78531 BL |
1947 | if (cmd->flags & CMD_FAST_FAIL) |
1948 | crq->status = VIOSRP_ADAPTER_FAIL; | |
88a678bb | 1949 | |
25e78531 | 1950 | crq->IU_length = cpu_to_be16(cmd->rsp.len); |
88a678bb | 1951 | |
25e78531 BL |
1952 | rc = h_send_crq(vscsi->dma_dev->unit_address, |
1953 | be64_to_cpu(msg_hi), | |
1954 | be64_to_cpu(cmd->rsp.tag)); | |
88a678bb | 1955 | |
417dff6c BL |
1956 | dev_dbg(&vscsi->dev, "send_messages: cmd %p, tag 0x%llx, rc %ld\n", |
1957 | cmd, be64_to_cpu(cmd->rsp.tag), | |
1958 | rc); | |
25e78531 BL |
1959 | |
1960 | /* if all ok free up the command | |
1961 | * element resources | |
1962 | */ | |
1963 | if (rc == H_SUCCESS) { | |
1964 | /* some movement has occurred */ | |
1965 | vscsi->rsp_q_timer.timer_pops = 0; | |
1966 | list_del(&cmd->list); | |
1967 | ||
1968 | ibmvscsis_free_cmd_resources(vscsi, | |
1969 | cmd); | |
1970 | } else { | |
1971 | srp_snd_msg_failed(vscsi, rc); | |
1972 | break; | |
1973 | } | |
1974 | } | |
88a678bb | 1975 | } |
25e78531 | 1976 | } while (retry); |
88a678bb BL |
1977 | |
1978 | if (!rc) { | |
1979 | /* | |
1980 | * The timer could pop with the queue empty. If | |
1981 | * this happens, rc will always indicate a | |
1982 | * success; clear the pop count. | |
1983 | */ | |
1984 | vscsi->rsp_q_timer.timer_pops = 0; | |
1985 | } | |
1986 | } else { | |
1987 | ibmvscsis_free_cmd_qs(vscsi); | |
1988 | } | |
1989 | } | |
1990 | ||
1991 | /* Called with intr lock held */ | |
1992 | static void ibmvscsis_send_mad_resp(struct scsi_info *vscsi, | |
1993 | struct ibmvscsis_cmd *cmd, | |
1994 | struct viosrp_crq *crq) | |
1995 | { | |
1996 | struct iu_entry *iue = cmd->iue; | |
1997 | struct mad_common *mad = (struct mad_common *)&vio_iu(iue)->mad; | |
1998 | uint flag_bits = 0; | |
1999 | long rc; | |
2000 | ||
2001 | dma_wmb(); | |
2002 | rc = h_copy_rdma(sizeof(struct mad_common), | |
2003 | vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma, | |
2004 | vscsi->dds.window[REMOTE].liobn, | |
2005 | be64_to_cpu(crq->IU_data_ptr)); | |
2006 | if (!rc) { | |
2007 | cmd->rsp.format = VIOSRP_MAD_FORMAT; | |
2008 | cmd->rsp.len = sizeof(struct mad_common); | |
2009 | cmd->rsp.tag = mad->tag; | |
2010 | list_add_tail(&cmd->list, &vscsi->waiting_rsp); | |
2011 | ibmvscsis_send_messages(vscsi); | |
2012 | } else { | |
417dff6c BL |
2013 | dev_dbg(&vscsi->dev, "Error sending mad response, rc %ld\n", |
2014 | rc); | |
88a678bb BL |
2015 | if (rc == H_PERMISSION) { |
2016 | if (connection_broken(vscsi)) | |
2017 | flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED); | |
2018 | } | |
2019 | dev_err(&vscsi->dev, "mad: failed to copy to client, rc %ld\n", | |
2020 | rc); | |
2021 | ||
2022 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2023 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, | |
2024 | flag_bits); | |
2025 | } | |
2026 | } | |
2027 | ||
2028 | /** | |
2029 | * ibmvscsis_mad() - Service a MAnagement Data gram. | |
2030 | * @vscsi: Pointer to our adapter structure | |
2031 | * @crq: Pointer to the CRQ entry containing the MAD request | |
2032 | * | |
2033 | * EXECUTION ENVIRONMENT: | |
79fac9c9 | 2034 | * Interrupt, called with adapter lock held |
88a678bb BL |
2035 | */ |
2036 | static long ibmvscsis_mad(struct scsi_info *vscsi, struct viosrp_crq *crq) | |
2037 | { | |
2038 | struct iu_entry *iue; | |
2039 | struct ibmvscsis_cmd *cmd; | |
2040 | struct mad_common *mad; | |
2041 | long rc = ADAPT_SUCCESS; | |
2042 | ||
2043 | switch (vscsi->state) { | |
2044 | /* | |
2045 | * We have not exchanged Init Msgs yet, so this MAD was sent | |
2046 | * before the last Transport Event; client will not be | |
2047 | * expecting a response. | |
2048 | */ | |
2049 | case WAIT_CONNECTION: | |
417dff6c BL |
2050 | dev_dbg(&vscsi->dev, "mad: in Wait Connection state, ignoring MAD, flags %d\n", |
2051 | vscsi->flags); | |
88a678bb BL |
2052 | return ADAPT_SUCCESS; |
2053 | ||
2054 | case SRP_PROCESSING: | |
2055 | case CONNECTED: | |
2056 | break; | |
2057 | ||
2058 | /* | |
2059 | * We should never get here while we're in these states. | |
2060 | * Just log an error and get out. | |
2061 | */ | |
2062 | case UNCONFIGURING: | |
2063 | case WAIT_IDLE: | |
2064 | case ERR_DISCONNECT: | |
2065 | case ERR_DISCONNECT_RECONNECT: | |
2066 | default: | |
2067 | dev_err(&vscsi->dev, "mad: invalid adapter state %d for mad\n", | |
2068 | vscsi->state); | |
2069 | return ADAPT_SUCCESS; | |
2070 | } | |
2071 | ||
2072 | cmd = ibmvscsis_get_free_cmd(vscsi); | |
2073 | if (!cmd) { | |
2074 | dev_err(&vscsi->dev, "mad: failed to get cmd, debit %d\n", | |
2075 | vscsi->debit); | |
2076 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2077 | return ERROR; | |
2078 | } | |
2079 | iue = cmd->iue; | |
2080 | cmd->type = ADAPTER_MAD; | |
2081 | ||
2082 | rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq); | |
2083 | if (!rc) { | |
2084 | mad = (struct mad_common *)&vio_iu(iue)->mad; | |
2085 | ||
417dff6c | 2086 | dev_dbg(&vscsi->dev, "mad: type %d\n", be32_to_cpu(mad->type)); |
88a678bb | 2087 | |
11950d70 | 2088 | rc = ibmvscsis_process_mad(vscsi, iue); |
88a678bb | 2089 | |
417dff6c BL |
2090 | dev_dbg(&vscsi->dev, "mad: status %hd, rc %ld\n", |
2091 | be16_to_cpu(mad->status), rc); | |
88a678bb BL |
2092 | |
2093 | if (!rc) | |
2094 | ibmvscsis_send_mad_resp(vscsi, cmd, crq); | |
2095 | } else { | |
2096 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2097 | } | |
2098 | ||
417dff6c | 2099 | dev_dbg(&vscsi->dev, "Leaving mad, rc %ld\n", rc); |
88a678bb BL |
2100 | return rc; |
2101 | } | |
2102 | ||
2103 | /** | |
2104 | * ibmvscsis_login_rsp() - Create/copy a login response notice to the client | |
2105 | * @vscsi: Pointer to our adapter structure | |
2106 | * @cmd: Pointer to the command for the SRP Login request | |
2107 | * | |
2108 | * EXECUTION ENVIRONMENT: | |
2109 | * Interrupt, interrupt lock held | |
2110 | */ | |
2111 | static long ibmvscsis_login_rsp(struct scsi_info *vscsi, | |
2112 | struct ibmvscsis_cmd *cmd) | |
2113 | { | |
2114 | struct iu_entry *iue = cmd->iue; | |
2115 | struct srp_login_rsp *rsp = &vio_iu(iue)->srp.login_rsp; | |
2116 | struct format_code *fmt; | |
2117 | uint flag_bits = 0; | |
2118 | long rc = ADAPT_SUCCESS; | |
2119 | ||
2120 | memset(rsp, 0, sizeof(struct srp_login_rsp)); | |
2121 | ||
2122 | rsp->opcode = SRP_LOGIN_RSP; | |
2123 | rsp->req_lim_delta = cpu_to_be32(vscsi->request_limit); | |
2124 | rsp->tag = cmd->rsp.tag; | |
2125 | rsp->max_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN); | |
2126 | rsp->max_ti_iu_len = cpu_to_be32(SRP_MAX_IU_LEN); | |
2127 | fmt = (struct format_code *)&rsp->buf_fmt; | |
2128 | fmt->buffers = SUPPORTED_FORMATS; | |
2129 | vscsi->credit = 0; | |
2130 | ||
2131 | cmd->rsp.len = sizeof(struct srp_login_rsp); | |
2132 | ||
2133 | dma_wmb(); | |
2134 | rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn, | |
2135 | iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn, | |
2136 | be64_to_cpu(iue->remote_token)); | |
2137 | ||
2138 | switch (rc) { | |
2139 | case H_SUCCESS: | |
2140 | break; | |
2141 | ||
2142 | case H_PERMISSION: | |
2143 | if (connection_broken(vscsi)) | |
2144 | flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED; | |
2145 | dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n", | |
2146 | rc); | |
2147 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, | |
2148 | flag_bits); | |
2149 | break; | |
2150 | case H_SOURCE_PARM: | |
2151 | case H_DEST_PARM: | |
2152 | default: | |
2153 | dev_err(&vscsi->dev, "login_rsp: error copying to client, rc %ld\n", | |
2154 | rc); | |
2155 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2156 | break; | |
2157 | } | |
2158 | ||
2159 | return rc; | |
2160 | } | |
2161 | ||
2162 | /** | |
2163 | * ibmvscsis_srp_login_rej() - Create/copy a login rejection notice to client | |
2164 | * @vscsi: Pointer to our adapter structure | |
2165 | * @cmd: Pointer to the command for the SRP Login request | |
2166 | * @reason: The reason the SRP Login is being rejected, per SRP protocol | |
2167 | * | |
2168 | * EXECUTION ENVIRONMENT: | |
2169 | * Interrupt, interrupt lock held | |
2170 | */ | |
2171 | static long ibmvscsis_srp_login_rej(struct scsi_info *vscsi, | |
2172 | struct ibmvscsis_cmd *cmd, u32 reason) | |
2173 | { | |
2174 | struct iu_entry *iue = cmd->iue; | |
2175 | struct srp_login_rej *rej = &vio_iu(iue)->srp.login_rej; | |
2176 | struct format_code *fmt; | |
2177 | uint flag_bits = 0; | |
2178 | long rc = ADAPT_SUCCESS; | |
2179 | ||
2180 | memset(rej, 0, sizeof(*rej)); | |
2181 | ||
2182 | rej->opcode = SRP_LOGIN_REJ; | |
2183 | rej->reason = cpu_to_be32(reason); | |
2184 | rej->tag = cmd->rsp.tag; | |
2185 | fmt = (struct format_code *)&rej->buf_fmt; | |
2186 | fmt->buffers = SUPPORTED_FORMATS; | |
2187 | ||
2188 | cmd->rsp.len = sizeof(*rej); | |
2189 | ||
2190 | dma_wmb(); | |
2191 | rc = h_copy_rdma(cmd->rsp.len, vscsi->dds.window[LOCAL].liobn, | |
2192 | iue->sbuf->dma, vscsi->dds.window[REMOTE].liobn, | |
2193 | be64_to_cpu(iue->remote_token)); | |
2194 | ||
2195 | switch (rc) { | |
2196 | case H_SUCCESS: | |
2197 | break; | |
2198 | case H_PERMISSION: | |
2199 | if (connection_broken(vscsi)) | |
79fac9c9 | 2200 | flag_bits = RESPONSE_Q_DOWN | CLIENT_FAILED; |
88a678bb BL |
2201 | dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n", |
2202 | rc); | |
2203 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, | |
2204 | flag_bits); | |
2205 | break; | |
2206 | case H_SOURCE_PARM: | |
2207 | case H_DEST_PARM: | |
2208 | default: | |
2209 | dev_err(&vscsi->dev, "login_rej: error copying to client, rc %ld\n", | |
2210 | rc); | |
2211 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2212 | break; | |
2213 | } | |
2214 | ||
2215 | return rc; | |
2216 | } | |
2217 | ||
2218 | static int ibmvscsis_make_nexus(struct ibmvscsis_tport *tport) | |
2219 | { | |
2220 | char *name = tport->tport_name; | |
2221 | struct ibmvscsis_nexus *nexus; | |
417dff6c | 2222 | struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport); |
88a678bb BL |
2223 | int rc; |
2224 | ||
2225 | if (tport->ibmv_nexus) { | |
417dff6c | 2226 | dev_dbg(&vscsi->dev, "tport->ibmv_nexus already exists\n"); |
88a678bb BL |
2227 | return 0; |
2228 | } | |
2229 | ||
2230 | nexus = kzalloc(sizeof(*nexus), GFP_KERNEL); | |
2231 | if (!nexus) { | |
417dff6c | 2232 | dev_err(&vscsi->dev, "Unable to allocate struct ibmvscsis_nexus\n"); |
88a678bb BL |
2233 | return -ENOMEM; |
2234 | } | |
2235 | ||
fa834287 | 2236 | nexus->se_sess = target_setup_session(&tport->se_tpg, 0, 0, |
88a678bb BL |
2237 | TARGET_PROT_NORMAL, name, nexus, |
2238 | NULL); | |
2239 | if (IS_ERR(nexus->se_sess)) { | |
2240 | rc = PTR_ERR(nexus->se_sess); | |
2241 | goto transport_init_fail; | |
2242 | } | |
2243 | ||
2244 | tport->ibmv_nexus = nexus; | |
2245 | ||
2246 | return 0; | |
2247 | ||
2248 | transport_init_fail: | |
2249 | kfree(nexus); | |
2250 | return rc; | |
2251 | } | |
2252 | ||
2253 | static int ibmvscsis_drop_nexus(struct ibmvscsis_tport *tport) | |
2254 | { | |
2255 | struct se_session *se_sess; | |
2256 | struct ibmvscsis_nexus *nexus; | |
2257 | ||
2258 | nexus = tport->ibmv_nexus; | |
2259 | if (!nexus) | |
2260 | return -ENODEV; | |
2261 | ||
2262 | se_sess = nexus->se_sess; | |
2263 | if (!se_sess) | |
2264 | return -ENODEV; | |
2265 | ||
2266 | /* | |
2267 | * Release the SCSI I_T Nexus to the emulated ibmvscsis Target Port | |
2268 | */ | |
712db3eb | 2269 | target_wait_for_sess_cmds(se_sess); |
b287e351 | 2270 | target_remove_session(se_sess); |
88a678bb BL |
2271 | tport->ibmv_nexus = NULL; |
2272 | kfree(nexus); | |
2273 | ||
2274 | return 0; | |
2275 | } | |
2276 | ||
2277 | /** | |
2278 | * ibmvscsis_srp_login() - Process an SRP Login Request | |
2279 | * @vscsi: Pointer to our adapter structure | |
2280 | * @cmd: Command element to use to process the SRP Login request | |
2281 | * @crq: Pointer to CRQ entry containing the SRP Login request | |
2282 | * | |
2283 | * EXECUTION ENVIRONMENT: | |
2284 | * Interrupt, called with interrupt lock held | |
2285 | */ | |
2286 | static long ibmvscsis_srp_login(struct scsi_info *vscsi, | |
2287 | struct ibmvscsis_cmd *cmd, | |
2288 | struct viosrp_crq *crq) | |
2289 | { | |
2290 | struct iu_entry *iue = cmd->iue; | |
2291 | struct srp_login_req *req = &vio_iu(iue)->srp.login_req; | |
2292 | struct port_id { | |
2293 | __be64 id_extension; | |
2294 | __be64 io_guid; | |
2295 | } *iport, *tport; | |
2296 | struct format_code *fmt; | |
2297 | u32 reason = 0x0; | |
2298 | long rc = ADAPT_SUCCESS; | |
2299 | ||
2300 | iport = (struct port_id *)req->initiator_port_id; | |
2301 | tport = (struct port_id *)req->target_port_id; | |
2302 | fmt = (struct format_code *)&req->req_buf_fmt; | |
2303 | if (be32_to_cpu(req->req_it_iu_len) > SRP_MAX_IU_LEN) | |
2304 | reason = SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE; | |
2305 | else if (be32_to_cpu(req->req_it_iu_len) < 64) | |
2306 | reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL; | |
2307 | else if ((be64_to_cpu(iport->id_extension) > (MAX_NUM_PORTS - 1)) || | |
2308 | (be64_to_cpu(tport->id_extension) > (MAX_NUM_PORTS - 1))) | |
2309 | reason = SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL; | |
2310 | else if (req->req_flags & SRP_MULTICHAN_MULTI) | |
2311 | reason = SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED; | |
2312 | else if (fmt->buffers & (~SUPPORTED_FORMATS)) | |
2313 | reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT; | |
f6dbe38e | 2314 | else if ((fmt->buffers & SUPPORTED_FORMATS) == 0) |
88a678bb BL |
2315 | reason = SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT; |
2316 | ||
2317 | if (vscsi->state == SRP_PROCESSING) | |
2318 | reason = SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED; | |
2319 | ||
2320 | rc = ibmvscsis_make_nexus(&vscsi->tport); | |
2321 | if (rc) | |
2322 | reason = SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL; | |
2323 | ||
2324 | cmd->rsp.format = VIOSRP_SRP_FORMAT; | |
2325 | cmd->rsp.tag = req->tag; | |
2326 | ||
417dff6c | 2327 | dev_dbg(&vscsi->dev, "srp_login: reason 0x%x\n", reason); |
88a678bb BL |
2328 | |
2329 | if (reason) | |
2330 | rc = ibmvscsis_srp_login_rej(vscsi, cmd, reason); | |
2331 | else | |
2332 | rc = ibmvscsis_login_rsp(vscsi, cmd); | |
2333 | ||
2334 | if (!rc) { | |
2335 | if (!reason) | |
2336 | vscsi->state = SRP_PROCESSING; | |
2337 | ||
2338 | list_add_tail(&cmd->list, &vscsi->waiting_rsp); | |
2339 | ibmvscsis_send_messages(vscsi); | |
2340 | } else { | |
2341 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2342 | } | |
2343 | ||
417dff6c | 2344 | dev_dbg(&vscsi->dev, "Leaving srp_login, rc %ld\n", rc); |
88a678bb BL |
2345 | return rc; |
2346 | } | |
2347 | ||
2348 | /** | |
2349 | * ibmvscsis_srp_i_logout() - Helper Function to close I_T Nexus | |
2350 | * @vscsi: Pointer to our adapter structure | |
2351 | * @cmd: Command element to use to process the Implicit Logout request | |
2352 | * @crq: Pointer to CRQ entry containing the Implicit Logout request | |
2353 | * | |
2354 | * Do the logic to close the I_T nexus. This function may not | |
2355 | * behave to specification. | |
2356 | * | |
2357 | * EXECUTION ENVIRONMENT: | |
2358 | * Interrupt, interrupt lock held | |
2359 | */ | |
2360 | static long ibmvscsis_srp_i_logout(struct scsi_info *vscsi, | |
2361 | struct ibmvscsis_cmd *cmd, | |
2362 | struct viosrp_crq *crq) | |
2363 | { | |
2364 | struct iu_entry *iue = cmd->iue; | |
2365 | struct srp_i_logout *log_out = &vio_iu(iue)->srp.i_logout; | |
2366 | long rc = ADAPT_SUCCESS; | |
2367 | ||
2368 | if ((vscsi->debit > 0) || !list_empty(&vscsi->schedule_q) || | |
2369 | !list_empty(&vscsi->waiting_rsp)) { | |
2370 | dev_err(&vscsi->dev, "i_logout: outstanding work\n"); | |
2371 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); | |
2372 | } else { | |
2373 | cmd->rsp.format = SRP_FORMAT; | |
2374 | cmd->rsp.tag = log_out->tag; | |
2375 | cmd->rsp.len = sizeof(struct mad_common); | |
2376 | list_add_tail(&cmd->list, &vscsi->waiting_rsp); | |
2377 | ibmvscsis_send_messages(vscsi); | |
2378 | ||
2379 | ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0); | |
2380 | } | |
2381 | ||
2382 | return rc; | |
2383 | } | |
2384 | ||
2385 | /* Called with intr lock held */ | |
2386 | static void ibmvscsis_srp_cmd(struct scsi_info *vscsi, struct viosrp_crq *crq) | |
2387 | { | |
2388 | struct ibmvscsis_cmd *cmd; | |
2389 | struct iu_entry *iue; | |
2390 | struct srp_cmd *srp; | |
2391 | struct srp_tsk_mgmt *tsk; | |
2392 | long rc; | |
2393 | ||
2394 | if (vscsi->request_limit - vscsi->debit <= 0) { | |
2395 | /* Client has exceeded request limit */ | |
2396 | dev_err(&vscsi->dev, "Client exceeded the request limit (%d), debit %d\n", | |
2397 | vscsi->request_limit, vscsi->debit); | |
2398 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2399 | return; | |
2400 | } | |
2401 | ||
2402 | cmd = ibmvscsis_get_free_cmd(vscsi); | |
2403 | if (!cmd) { | |
2404 | dev_err(&vscsi->dev, "srp_cmd failed to get cmd, debit %d\n", | |
2405 | vscsi->debit); | |
2406 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2407 | return; | |
2408 | } | |
2409 | iue = cmd->iue; | |
2410 | srp = &vio_iu(iue)->srp.cmd; | |
2411 | ||
2412 | rc = ibmvscsis_copy_crq_packet(vscsi, cmd, crq); | |
2413 | if (rc) { | |
2414 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2415 | return; | |
2416 | } | |
2417 | ||
2418 | if (vscsi->state == SRP_PROCESSING) { | |
2419 | switch (srp->opcode) { | |
2420 | case SRP_LOGIN_REQ: | |
2421 | rc = ibmvscsis_srp_login(vscsi, cmd, crq); | |
2422 | break; | |
2423 | ||
2424 | case SRP_TSK_MGMT: | |
2425 | tsk = &vio_iu(iue)->srp.tsk_mgmt; | |
417dff6c BL |
2426 | dev_dbg(&vscsi->dev, "tsk_mgmt tag: %llu (0x%llx)\n", |
2427 | tsk->tag, tsk->tag); | |
88a678bb BL |
2428 | cmd->rsp.tag = tsk->tag; |
2429 | vscsi->debit += 1; | |
2430 | cmd->type = TASK_MANAGEMENT; | |
2431 | list_add_tail(&cmd->list, &vscsi->schedule_q); | |
2432 | queue_work(vscsi->work_q, &cmd->work); | |
2433 | break; | |
2434 | ||
2435 | case SRP_CMD: | |
417dff6c BL |
2436 | dev_dbg(&vscsi->dev, "srp_cmd tag: %llu (0x%llx)\n", |
2437 | srp->tag, srp->tag); | |
88a678bb BL |
2438 | cmd->rsp.tag = srp->tag; |
2439 | vscsi->debit += 1; | |
2440 | cmd->type = SCSI_CDB; | |
2441 | /* | |
2442 | * We want to keep track of work waiting for | |
2443 | * the workqueue. | |
2444 | */ | |
2445 | list_add_tail(&cmd->list, &vscsi->schedule_q); | |
2446 | queue_work(vscsi->work_q, &cmd->work); | |
2447 | break; | |
2448 | ||
2449 | case SRP_I_LOGOUT: | |
2450 | rc = ibmvscsis_srp_i_logout(vscsi, cmd, crq); | |
2451 | break; | |
2452 | ||
2453 | case SRP_CRED_RSP: | |
2454 | case SRP_AER_RSP: | |
2455 | default: | |
2456 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2457 | dev_err(&vscsi->dev, "invalid srp cmd, opcode %d\n", | |
2458 | (uint)srp->opcode); | |
2459 | ibmvscsis_post_disconnect(vscsi, | |
2460 | ERR_DISCONNECT_RECONNECT, 0); | |
2461 | break; | |
2462 | } | |
2463 | } else if (srp->opcode == SRP_LOGIN_REQ && vscsi->state == CONNECTED) { | |
2464 | rc = ibmvscsis_srp_login(vscsi, cmd, crq); | |
2465 | } else { | |
2466 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2467 | dev_err(&vscsi->dev, "Invalid state %d to handle srp cmd\n", | |
2468 | vscsi->state); | |
2469 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2470 | } | |
2471 | } | |
2472 | ||
2473 | /** | |
2474 | * ibmvscsis_ping_response() - Respond to a ping request | |
2475 | * @vscsi: Pointer to our adapter structure | |
2476 | * | |
2477 | * Let the client know that the server is alive and waiting on | |
2478 | * its native I/O stack. | |
2479 | * If any type of error occurs from the call to queue a ping | |
2480 | * response then the client is either not accepting or receiving | |
2481 | * interrupts. Disconnect with an error. | |
2482 | * | |
2483 | * EXECUTION ENVIRONMENT: | |
2484 | * Interrupt, interrupt lock held | |
2485 | */ | |
2486 | static long ibmvscsis_ping_response(struct scsi_info *vscsi) | |
2487 | { | |
2488 | struct viosrp_crq *crq; | |
2489 | u64 buffer[2] = { 0, 0 }; | |
2490 | long rc; | |
2491 | ||
2492 | crq = (struct viosrp_crq *)&buffer; | |
2493 | crq->valid = VALID_CMD_RESP_EL; | |
2494 | crq->format = (u8)MESSAGE_IN_CRQ; | |
2495 | crq->status = PING_RESPONSE; | |
2496 | ||
2497 | rc = h_send_crq(vscsi->dds.unit_id, cpu_to_be64(buffer[MSG_HI]), | |
2498 | cpu_to_be64(buffer[MSG_LOW])); | |
2499 | ||
2500 | switch (rc) { | |
2501 | case H_SUCCESS: | |
2502 | break; | |
2503 | case H_CLOSED: | |
2504 | vscsi->flags |= CLIENT_FAILED; | |
2505 | case H_DROPPED: | |
2506 | vscsi->flags |= RESPONSE_Q_DOWN; | |
2507 | case H_REMOTE_PARM: | |
2508 | dev_err(&vscsi->dev, "ping_response: h_send_crq failed, rc %ld\n", | |
2509 | rc); | |
2510 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2511 | break; | |
2512 | default: | |
2513 | dev_err(&vscsi->dev, "ping_response: h_send_crq returned unknown rc %ld\n", | |
2514 | rc); | |
2515 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); | |
2516 | break; | |
2517 | } | |
2518 | ||
2519 | return rc; | |
2520 | } | |
2521 | ||
88a678bb BL |
2522 | /** |
2523 | * ibmvscsis_parse_command() - Parse an element taken from the cmd rsp queue. | |
2524 | * @vscsi: Pointer to our adapter structure | |
2525 | * @crq: Pointer to CRQ element containing the SRP request | |
2526 | * | |
2527 | * This function will return success if the command queue element is valid | |
2528 | * and the srp iu or MAD request it pointed to was also valid. That does | |
2529 | * not mean that an error was not returned to the client. | |
2530 | * | |
2531 | * EXECUTION ENVIRONMENT: | |
2532 | * Interrupt, intr lock held | |
2533 | */ | |
2534 | static long ibmvscsis_parse_command(struct scsi_info *vscsi, | |
2535 | struct viosrp_crq *crq) | |
2536 | { | |
2537 | long rc = ADAPT_SUCCESS; | |
2538 | ||
2539 | switch (crq->valid) { | |
2540 | case VALID_CMD_RESP_EL: | |
2541 | switch (crq->format) { | |
2542 | case OS400_FORMAT: | |
2543 | case AIX_FORMAT: | |
2544 | case LINUX_FORMAT: | |
2545 | case MAD_FORMAT: | |
2546 | if (vscsi->flags & PROCESSING_MAD) { | |
2547 | rc = ERROR; | |
2548 | dev_err(&vscsi->dev, "parse_command: already processing mad\n"); | |
2549 | ibmvscsis_post_disconnect(vscsi, | |
2550 | ERR_DISCONNECT_RECONNECT, | |
2551 | 0); | |
2552 | } else { | |
2553 | vscsi->flags |= PROCESSING_MAD; | |
2554 | rc = ibmvscsis_mad(vscsi, crq); | |
2555 | } | |
2556 | break; | |
2557 | ||
2558 | case SRP_FORMAT: | |
2559 | ibmvscsis_srp_cmd(vscsi, crq); | |
2560 | break; | |
2561 | ||
2562 | case MESSAGE_IN_CRQ: | |
2563 | if (crq->status == PING) | |
2564 | ibmvscsis_ping_response(vscsi); | |
2565 | break; | |
2566 | ||
2567 | default: | |
2568 | dev_err(&vscsi->dev, "parse_command: invalid format %d\n", | |
2569 | (uint)crq->format); | |
2570 | ibmvscsis_post_disconnect(vscsi, | |
2571 | ERR_DISCONNECT_RECONNECT, 0); | |
2572 | break; | |
2573 | } | |
2574 | break; | |
2575 | ||
2576 | case VALID_TRANS_EVENT: | |
79fac9c9 | 2577 | rc = ibmvscsis_trans_event(vscsi, crq); |
88a678bb BL |
2578 | break; |
2579 | ||
2580 | case VALID_INIT_MSG: | |
2581 | rc = ibmvscsis_init_msg(vscsi, crq); | |
2582 | break; | |
2583 | ||
2584 | default: | |
2585 | dev_err(&vscsi->dev, "parse_command: invalid valid field %d\n", | |
2586 | (uint)crq->valid); | |
2587 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2588 | break; | |
2589 | } | |
2590 | ||
2591 | /* | |
2592 | * Return only what the interrupt handler cares | |
2593 | * about. Most errors we keep right on trucking. | |
2594 | */ | |
2595 | rc = vscsi->flags & SCHEDULE_DISCONNECT; | |
2596 | ||
2597 | return rc; | |
2598 | } | |
2599 | ||
2600 | static int read_dma_window(struct scsi_info *vscsi) | |
2601 | { | |
2602 | struct vio_dev *vdev = vscsi->dma_dev; | |
2603 | const __be32 *dma_window; | |
2604 | const __be32 *prop; | |
2605 | ||
2606 | /* TODO Using of_parse_dma_window would be better, but it doesn't give | |
2607 | * a way to read multiple windows without already knowing the size of | |
2608 | * a window or the number of windows. | |
2609 | */ | |
2610 | dma_window = (const __be32 *)vio_get_attribute(vdev, | |
2611 | "ibm,my-dma-window", | |
2612 | NULL); | |
2613 | if (!dma_window) { | |
417dff6c | 2614 | dev_err(&vscsi->dev, "Couldn't find ibm,my-dma-window property\n"); |
88a678bb BL |
2615 | return -1; |
2616 | } | |
2617 | ||
2618 | vscsi->dds.window[LOCAL].liobn = be32_to_cpu(*dma_window); | |
2619 | dma_window++; | |
2620 | ||
2621 | prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-address-cells", | |
2622 | NULL); | |
2623 | if (!prop) { | |
417dff6c | 2624 | dev_warn(&vscsi->dev, "Couldn't find ibm,#dma-address-cells property\n"); |
88a678bb BL |
2625 | dma_window++; |
2626 | } else { | |
2627 | dma_window += be32_to_cpu(*prop); | |
2628 | } | |
2629 | ||
2630 | prop = (const __be32 *)vio_get_attribute(vdev, "ibm,#dma-size-cells", | |
2631 | NULL); | |
2632 | if (!prop) { | |
417dff6c | 2633 | dev_warn(&vscsi->dev, "Couldn't find ibm,#dma-size-cells property\n"); |
88a678bb BL |
2634 | dma_window++; |
2635 | } else { | |
2636 | dma_window += be32_to_cpu(*prop); | |
2637 | } | |
2638 | ||
2639 | /* dma_window should point to the second window now */ | |
2640 | vscsi->dds.window[REMOTE].liobn = be32_to_cpu(*dma_window); | |
2641 | ||
2642 | return 0; | |
2643 | } | |
2644 | ||
2645 | static struct ibmvscsis_tport *ibmvscsis_lookup_port(const char *name) | |
2646 | { | |
2647 | struct ibmvscsis_tport *tport = NULL; | |
2648 | struct vio_dev *vdev; | |
2649 | struct scsi_info *vscsi; | |
2650 | ||
2651 | spin_lock_bh(&ibmvscsis_dev_lock); | |
2652 | list_for_each_entry(vscsi, &ibmvscsis_dev_list, list) { | |
2653 | vdev = vscsi->dma_dev; | |
2654 | if (!strcmp(dev_name(&vdev->dev), name)) { | |
2655 | tport = &vscsi->tport; | |
2656 | break; | |
2657 | } | |
2658 | } | |
2659 | spin_unlock_bh(&ibmvscsis_dev_lock); | |
2660 | ||
2661 | return tport; | |
2662 | } | |
2663 | ||
2664 | /** | |
2665 | * ibmvscsis_parse_cmd() - Parse SRP Command | |
2666 | * @vscsi: Pointer to our adapter structure | |
2667 | * @cmd: Pointer to command element with SRP command | |
2668 | * | |
2669 | * Parse the srp command; if it is valid then submit it to tcm. | |
2670 | * Note: The return code does not reflect the status of the SCSI CDB. | |
2671 | * | |
2672 | * EXECUTION ENVIRONMENT: | |
2673 | * Process level | |
2674 | */ | |
2675 | static void ibmvscsis_parse_cmd(struct scsi_info *vscsi, | |
2676 | struct ibmvscsis_cmd *cmd) | |
2677 | { | |
2678 | struct iu_entry *iue = cmd->iue; | |
2679 | struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf; | |
2680 | struct ibmvscsis_nexus *nexus; | |
2681 | u64 data_len = 0; | |
2682 | enum dma_data_direction dir; | |
2683 | int attr = 0; | |
2684 | int rc = 0; | |
2685 | ||
2686 | nexus = vscsi->tport.ibmv_nexus; | |
2687 | /* | |
2688 | * additional length in bytes. Note that the SRP spec says that | |
2689 | * additional length is in 4-byte words, but technically the | |
2690 | * additional length field is only the upper 6 bits of the byte. | |
2691 | * The lower 2 bits are reserved. If the lower 2 bits are 0 (as | |
2692 | * all reserved fields should be), then interpreting the byte as | |
2693 | * an int will yield the length in bytes. | |
2694 | */ | |
2695 | if (srp->add_cdb_len & 0x03) { | |
2696 | dev_err(&vscsi->dev, "parse_cmd: reserved bits set in IU\n"); | |
2697 | spin_lock_bh(&vscsi->intr_lock); | |
2698 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2699 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2700 | spin_unlock_bh(&vscsi->intr_lock); | |
2701 | return; | |
2702 | } | |
2703 | ||
2704 | if (srp_get_desc_table(srp, &dir, &data_len)) { | |
2705 | dev_err(&vscsi->dev, "0x%llx: parsing SRP descriptor table failed.\n", | |
2706 | srp->tag); | |
2707 | goto fail; | |
88a678bb BL |
2708 | } |
2709 | ||
2710 | cmd->rsp.sol_not = srp->sol_not; | |
2711 | ||
2712 | switch (srp->task_attr) { | |
2713 | case SRP_SIMPLE_TASK: | |
2714 | attr = TCM_SIMPLE_TAG; | |
2715 | break; | |
2716 | case SRP_ORDERED_TASK: | |
2717 | attr = TCM_ORDERED_TAG; | |
2718 | break; | |
2719 | case SRP_HEAD_TASK: | |
2720 | attr = TCM_HEAD_TAG; | |
2721 | break; | |
2722 | case SRP_ACA_TASK: | |
2723 | attr = TCM_ACA_TAG; | |
2724 | break; | |
2725 | default: | |
2726 | dev_err(&vscsi->dev, "Invalid task attribute %d\n", | |
2727 | srp->task_attr); | |
2728 | goto fail; | |
2729 | } | |
2730 | ||
2731 | cmd->se_cmd.tag = be64_to_cpu(srp->tag); | |
2732 | ||
2733 | spin_lock_bh(&vscsi->intr_lock); | |
2734 | list_add_tail(&cmd->list, &vscsi->active_q); | |
2735 | spin_unlock_bh(&vscsi->intr_lock); | |
2736 | ||
2737 | srp->lun.scsi_lun[0] &= 0x3f; | |
2738 | ||
88a678bb BL |
2739 | rc = target_submit_cmd(&cmd->se_cmd, nexus->se_sess, srp->cdb, |
2740 | cmd->sense_buf, scsilun_to_int(&srp->lun), | |
2741 | data_len, attr, dir, 0); | |
2742 | if (rc) { | |
2743 | dev_err(&vscsi->dev, "target_submit_cmd failed, rc %d\n", rc); | |
7435b32e MC |
2744 | spin_lock_bh(&vscsi->intr_lock); |
2745 | list_del(&cmd->list); | |
2746 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2747 | spin_unlock_bh(&vscsi->intr_lock); | |
88a678bb BL |
2748 | goto fail; |
2749 | } | |
2750 | return; | |
2751 | ||
2752 | fail: | |
2753 | spin_lock_bh(&vscsi->intr_lock); | |
2754 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT_RECONNECT, 0); | |
2755 | spin_unlock_bh(&vscsi->intr_lock); | |
2756 | } | |
2757 | ||
2758 | /** | |
2759 | * ibmvscsis_parse_task() - Parse SRP Task Management Request | |
2760 | * @vscsi: Pointer to our adapter structure | |
2761 | * @cmd: Pointer to command element with SRP task management request | |
2762 | * | |
2763 | * Parse the srp task management request; if it is valid then submit it to tcm. | |
2764 | * Note: The return code does not reflect the status of the task management | |
2765 | * request. | |
2766 | * | |
2767 | * EXECUTION ENVIRONMENT: | |
2768 | * Processor level | |
2769 | */ | |
2770 | static void ibmvscsis_parse_task(struct scsi_info *vscsi, | |
2771 | struct ibmvscsis_cmd *cmd) | |
2772 | { | |
2773 | struct iu_entry *iue = cmd->iue; | |
2774 | struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt; | |
2775 | int tcm_type; | |
2776 | u64 tag_to_abort = 0; | |
2777 | int rc = 0; | |
2778 | struct ibmvscsis_nexus *nexus; | |
2779 | ||
2780 | nexus = vscsi->tport.ibmv_nexus; | |
2781 | ||
2782 | cmd->rsp.sol_not = srp_tsk->sol_not; | |
2783 | ||
2784 | switch (srp_tsk->tsk_mgmt_func) { | |
2785 | case SRP_TSK_ABORT_TASK: | |
2786 | tcm_type = TMR_ABORT_TASK; | |
2787 | tag_to_abort = be64_to_cpu(srp_tsk->task_tag); | |
2788 | break; | |
2789 | case SRP_TSK_ABORT_TASK_SET: | |
2790 | tcm_type = TMR_ABORT_TASK_SET; | |
2791 | break; | |
2792 | case SRP_TSK_CLEAR_TASK_SET: | |
2793 | tcm_type = TMR_CLEAR_TASK_SET; | |
2794 | break; | |
2795 | case SRP_TSK_LUN_RESET: | |
2796 | tcm_type = TMR_LUN_RESET; | |
2797 | break; | |
2798 | case SRP_TSK_CLEAR_ACA: | |
2799 | tcm_type = TMR_CLEAR_ACA; | |
2800 | break; | |
2801 | default: | |
2802 | dev_err(&vscsi->dev, "unknown task mgmt func %d\n", | |
2803 | srp_tsk->tsk_mgmt_func); | |
2804 | cmd->se_cmd.se_tmr_req->response = | |
2805 | TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; | |
2806 | rc = -1; | |
2807 | break; | |
2808 | } | |
2809 | ||
2810 | if (!rc) { | |
2811 | cmd->se_cmd.tag = be64_to_cpu(srp_tsk->tag); | |
2812 | ||
2813 | spin_lock_bh(&vscsi->intr_lock); | |
2814 | list_add_tail(&cmd->list, &vscsi->active_q); | |
2815 | spin_unlock_bh(&vscsi->intr_lock); | |
2816 | ||
2817 | srp_tsk->lun.scsi_lun[0] &= 0x3f; | |
2818 | ||
417dff6c BL |
2819 | dev_dbg(&vscsi->dev, "calling submit_tmr, func %d\n", |
2820 | srp_tsk->tsk_mgmt_func); | |
88a678bb BL |
2821 | rc = target_submit_tmr(&cmd->se_cmd, nexus->se_sess, NULL, |
2822 | scsilun_to_int(&srp_tsk->lun), srp_tsk, | |
2823 | tcm_type, GFP_KERNEL, tag_to_abort, 0); | |
2824 | if (rc) { | |
2825 | dev_err(&vscsi->dev, "target_submit_tmr failed, rc %d\n", | |
2826 | rc); | |
7435b32e MC |
2827 | spin_lock_bh(&vscsi->intr_lock); |
2828 | list_del(&cmd->list); | |
2829 | spin_unlock_bh(&vscsi->intr_lock); | |
88a678bb BL |
2830 | cmd->se_cmd.se_tmr_req->response = |
2831 | TMR_FUNCTION_REJECTED; | |
2832 | } | |
2833 | } | |
2834 | ||
2835 | if (rc) | |
2836 | transport_send_check_condition_and_sense(&cmd->se_cmd, 0, 0); | |
2837 | } | |
2838 | ||
2839 | static void ibmvscsis_scheduler(struct work_struct *work) | |
2840 | { | |
2841 | struct ibmvscsis_cmd *cmd = container_of(work, struct ibmvscsis_cmd, | |
2842 | work); | |
2843 | struct scsi_info *vscsi = cmd->adapter; | |
2844 | ||
2845 | spin_lock_bh(&vscsi->intr_lock); | |
2846 | ||
2847 | /* Remove from schedule_q */ | |
2848 | list_del(&cmd->list); | |
2849 | ||
2850 | /* Don't submit cmd if we're disconnecting */ | |
2851 | if (vscsi->flags & (SCHEDULE_DISCONNECT | DISCONNECT_SCHEDULED)) { | |
2852 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2853 | ||
2854 | /* ibmvscsis_disconnect might be waiting for us */ | |
2855 | if (list_empty(&vscsi->active_q) && | |
2856 | list_empty(&vscsi->schedule_q) && | |
2857 | (vscsi->flags & WAIT_FOR_IDLE)) { | |
2858 | vscsi->flags &= ~WAIT_FOR_IDLE; | |
2859 | complete(&vscsi->wait_idle); | |
2860 | } | |
2861 | ||
2862 | spin_unlock_bh(&vscsi->intr_lock); | |
2863 | return; | |
2864 | } | |
2865 | ||
2866 | spin_unlock_bh(&vscsi->intr_lock); | |
2867 | ||
2868 | switch (cmd->type) { | |
2869 | case SCSI_CDB: | |
2870 | ibmvscsis_parse_cmd(vscsi, cmd); | |
2871 | break; | |
2872 | case TASK_MANAGEMENT: | |
2873 | ibmvscsis_parse_task(vscsi, cmd); | |
2874 | break; | |
2875 | default: | |
2876 | dev_err(&vscsi->dev, "scheduler, invalid cmd type %d\n", | |
2877 | cmd->type); | |
2878 | spin_lock_bh(&vscsi->intr_lock); | |
2879 | ibmvscsis_free_cmd_resources(vscsi, cmd); | |
2880 | spin_unlock_bh(&vscsi->intr_lock); | |
2881 | break; | |
2882 | } | |
2883 | } | |
2884 | ||
2885 | static int ibmvscsis_alloc_cmds(struct scsi_info *vscsi, int num) | |
2886 | { | |
2887 | struct ibmvscsis_cmd *cmd; | |
2888 | int i; | |
2889 | ||
2890 | INIT_LIST_HEAD(&vscsi->free_cmd); | |
2891 | vscsi->cmd_pool = kcalloc(num, sizeof(struct ibmvscsis_cmd), | |
2892 | GFP_KERNEL); | |
2893 | if (!vscsi->cmd_pool) | |
2894 | return -ENOMEM; | |
2895 | ||
2896 | for (i = 0, cmd = (struct ibmvscsis_cmd *)vscsi->cmd_pool; i < num; | |
2897 | i++, cmd++) { | |
25e78531 | 2898 | cmd->abort_cmd = NULL; |
88a678bb BL |
2899 | cmd->adapter = vscsi; |
2900 | INIT_WORK(&cmd->work, ibmvscsis_scheduler); | |
2901 | list_add_tail(&cmd->list, &vscsi->free_cmd); | |
2902 | } | |
2903 | ||
2904 | return 0; | |
2905 | } | |
2906 | ||
2907 | static void ibmvscsis_free_cmds(struct scsi_info *vscsi) | |
2908 | { | |
2909 | kfree(vscsi->cmd_pool); | |
2910 | vscsi->cmd_pool = NULL; | |
2911 | INIT_LIST_HEAD(&vscsi->free_cmd); | |
2912 | } | |
2913 | ||
2914 | /** | |
2915 | * ibmvscsis_service_wait_q() - Service Waiting Queue | |
2916 | * @timer: Pointer to timer which has expired | |
2917 | * | |
2918 | * This routine is called when the timer pops to service the waiting | |
2919 | * queue. Elements on the queue have completed, their responses have been | |
2920 | * copied to the client, but the client's response queue was full so | |
2921 | * the queue message could not be sent. The routine grabs the proper locks | |
2922 | * and calls send messages. | |
2923 | * | |
2924 | * EXECUTION ENVIRONMENT: | |
2925 | * called at interrupt level | |
2926 | */ | |
2927 | static enum hrtimer_restart ibmvscsis_service_wait_q(struct hrtimer *timer) | |
2928 | { | |
2929 | struct timer_cb *p_timer = container_of(timer, struct timer_cb, timer); | |
2930 | struct scsi_info *vscsi = container_of(p_timer, struct scsi_info, | |
2931 | rsp_q_timer); | |
2932 | ||
2933 | spin_lock_bh(&vscsi->intr_lock); | |
2934 | p_timer->timer_pops += 1; | |
2935 | p_timer->started = false; | |
2936 | ibmvscsis_send_messages(vscsi); | |
2937 | spin_unlock_bh(&vscsi->intr_lock); | |
2938 | ||
2939 | return HRTIMER_NORESTART; | |
2940 | } | |
2941 | ||
2942 | static long ibmvscsis_alloctimer(struct scsi_info *vscsi) | |
2943 | { | |
2944 | struct timer_cb *p_timer; | |
2945 | ||
2946 | p_timer = &vscsi->rsp_q_timer; | |
2947 | hrtimer_init(&p_timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
2948 | ||
2949 | p_timer->timer.function = ibmvscsis_service_wait_q; | |
2950 | p_timer->started = false; | |
2951 | p_timer->timer_pops = 0; | |
2952 | ||
2953 | return ADAPT_SUCCESS; | |
2954 | } | |
2955 | ||
2956 | static void ibmvscsis_freetimer(struct scsi_info *vscsi) | |
2957 | { | |
2958 | struct timer_cb *p_timer; | |
2959 | ||
2960 | p_timer = &vscsi->rsp_q_timer; | |
2961 | ||
2962 | (void)hrtimer_cancel(&p_timer->timer); | |
2963 | ||
2964 | p_timer->started = false; | |
2965 | p_timer->timer_pops = 0; | |
2966 | } | |
2967 | ||
2968 | static irqreturn_t ibmvscsis_interrupt(int dummy, void *data) | |
2969 | { | |
2970 | struct scsi_info *vscsi = data; | |
2971 | ||
2972 | vio_disable_interrupts(vscsi->dma_dev); | |
2973 | tasklet_schedule(&vscsi->work_task); | |
2974 | ||
2975 | return IRQ_HANDLED; | |
2976 | } | |
2977 | ||
88a678bb BL |
2978 | /** |
2979 | * ibmvscsis_enable_change_state() - Set new state based on enabled status | |
2980 | * @vscsi: Pointer to our adapter structure | |
2981 | * | |
2982 | * This function determines our new state now that we are enabled. This | |
2983 | * may involve sending an Init Complete message to the client. | |
2984 | * | |
2985 | * Must be called with interrupt lock held. | |
2986 | */ | |
2987 | static long ibmvscsis_enable_change_state(struct scsi_info *vscsi) | |
2988 | { | |
c9b3379f | 2989 | int bytes; |
88a678bb BL |
2990 | long rc = ADAPT_SUCCESS; |
2991 | ||
c9b3379f MC |
2992 | bytes = vscsi->cmd_q.size * PAGE_SIZE; |
2993 | rc = h_reg_crq(vscsi->dds.unit_id, vscsi->cmd_q.crq_token, bytes); | |
2994 | if (rc == H_CLOSED || rc == H_SUCCESS) { | |
2995 | vscsi->state = WAIT_CONNECTION; | |
2996 | rc = ibmvscsis_establish_new_q(vscsi); | |
2997 | } | |
88a678bb | 2998 | |
c9b3379f MC |
2999 | if (rc != ADAPT_SUCCESS) { |
3000 | vscsi->state = ERR_DISCONNECTED; | |
3001 | vscsi->flags |= RESPONSE_Q_DOWN; | |
88a678bb BL |
3002 | } |
3003 | ||
3004 | return rc; | |
3005 | } | |
3006 | ||
3007 | /** | |
3008 | * ibmvscsis_create_command_q() - Create Command Queue | |
3009 | * @vscsi: Pointer to our adapter structure | |
3010 | * @num_cmds: Currently unused. In the future, may be used to determine | |
3011 | * the size of the CRQ. | |
3012 | * | |
3013 | * Allocates memory for command queue maps remote memory into an ioba | |
3014 | * initializes the command response queue | |
3015 | * | |
3016 | * EXECUTION ENVIRONMENT: | |
3017 | * Process level only | |
3018 | */ | |
3019 | static long ibmvscsis_create_command_q(struct scsi_info *vscsi, int num_cmds) | |
3020 | { | |
88a678bb BL |
3021 | int pages; |
3022 | struct vio_dev *vdev = vscsi->dma_dev; | |
3023 | ||
3024 | /* We might support multiple pages in the future, but just 1 for now */ | |
3025 | pages = 1; | |
3026 | ||
3027 | vscsi->cmd_q.size = pages; | |
3028 | ||
3029 | vscsi->cmd_q.base_addr = | |
3030 | (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); | |
3031 | if (!vscsi->cmd_q.base_addr) | |
3032 | return -ENOMEM; | |
3033 | ||
3034 | vscsi->cmd_q.mask = ((uint)pages * CRQ_PER_PAGE) - 1; | |
3035 | ||
3036 | vscsi->cmd_q.crq_token = dma_map_single(&vdev->dev, | |
3037 | vscsi->cmd_q.base_addr, | |
3038 | PAGE_SIZE, DMA_BIDIRECTIONAL); | |
3039 | if (dma_mapping_error(&vdev->dev, vscsi->cmd_q.crq_token)) { | |
3040 | free_page((unsigned long)vscsi->cmd_q.base_addr); | |
3041 | return -ENOMEM; | |
3042 | } | |
3043 | ||
c9b3379f | 3044 | return 0; |
88a678bb BL |
3045 | } |
3046 | ||
3047 | /** | |
3048 | * ibmvscsis_destroy_command_q - Destroy Command Queue | |
3049 | * @vscsi: Pointer to our adapter structure | |
3050 | * | |
3051 | * Releases memory for command queue and unmaps mapped remote memory. | |
3052 | * | |
3053 | * EXECUTION ENVIRONMENT: | |
3054 | * Process level only | |
3055 | */ | |
3056 | static void ibmvscsis_destroy_command_q(struct scsi_info *vscsi) | |
3057 | { | |
3058 | dma_unmap_single(&vscsi->dma_dev->dev, vscsi->cmd_q.crq_token, | |
3059 | PAGE_SIZE, DMA_BIDIRECTIONAL); | |
3060 | free_page((unsigned long)vscsi->cmd_q.base_addr); | |
3061 | vscsi->cmd_q.base_addr = NULL; | |
3062 | vscsi->state = NO_QUEUE; | |
3063 | } | |
3064 | ||
3065 | static u8 ibmvscsis_fast_fail(struct scsi_info *vscsi, | |
3066 | struct ibmvscsis_cmd *cmd) | |
3067 | { | |
3068 | struct iu_entry *iue = cmd->iue; | |
3069 | struct se_cmd *se_cmd = &cmd->se_cmd; | |
3070 | struct srp_cmd *srp = (struct srp_cmd *)iue->sbuf->buf; | |
3071 | struct scsi_sense_hdr sshdr; | |
3072 | u8 rc = se_cmd->scsi_status; | |
3073 | ||
3074 | if (vscsi->fast_fail && (READ_CMD(srp->cdb) || WRITE_CMD(srp->cdb))) | |
3075 | if (scsi_normalize_sense(se_cmd->sense_buffer, | |
3076 | se_cmd->scsi_sense_length, &sshdr)) | |
3077 | if (sshdr.sense_key == HARDWARE_ERROR && | |
3078 | (se_cmd->residual_count == 0 || | |
3079 | se_cmd->residual_count == se_cmd->data_length)) { | |
3080 | rc = NO_SENSE; | |
3081 | cmd->flags |= CMD_FAST_FAIL; | |
3082 | } | |
3083 | ||
3084 | return rc; | |
3085 | } | |
3086 | ||
3087 | /** | |
3088 | * srp_build_response() - Build an SRP response buffer | |
3089 | * @vscsi: Pointer to our adapter structure | |
3090 | * @cmd: Pointer to command for which to send the response | |
3091 | * @len_p: Where to return the length of the IU response sent. This | |
3092 | * is needed to construct the CRQ response. | |
3093 | * | |
3094 | * Build the SRP response buffer and copy it to the client's memory space. | |
3095 | */ | |
3096 | static long srp_build_response(struct scsi_info *vscsi, | |
3097 | struct ibmvscsis_cmd *cmd, uint *len_p) | |
3098 | { | |
3099 | struct iu_entry *iue = cmd->iue; | |
3100 | struct se_cmd *se_cmd = &cmd->se_cmd; | |
3101 | struct srp_rsp *rsp; | |
3102 | uint len; | |
3103 | u32 rsp_code; | |
3104 | char *data; | |
3105 | u32 *tsk_status; | |
3106 | long rc = ADAPT_SUCCESS; | |
3107 | ||
3108 | spin_lock_bh(&vscsi->intr_lock); | |
3109 | ||
3110 | rsp = &vio_iu(iue)->srp.rsp; | |
3111 | len = sizeof(*rsp); | |
3112 | memset(rsp, 0, len); | |
3113 | data = rsp->data; | |
3114 | ||
3115 | rsp->opcode = SRP_RSP; | |
3116 | ||
75dbf2d3 | 3117 | rsp->req_lim_delta = cpu_to_be32(1 + vscsi->credit); |
88a678bb BL |
3118 | rsp->tag = cmd->rsp.tag; |
3119 | rsp->flags = 0; | |
3120 | ||
3121 | if (cmd->type == SCSI_CDB) { | |
3122 | rsp->status = ibmvscsis_fast_fail(vscsi, cmd); | |
3123 | if (rsp->status) { | |
417dff6c BL |
3124 | dev_dbg(&vscsi->dev, "build_resp: cmd %p, scsi status %d\n", |
3125 | cmd, (int)rsp->status); | |
88a678bb BL |
3126 | ibmvscsis_determine_resid(se_cmd, rsp); |
3127 | if (se_cmd->scsi_sense_length && se_cmd->sense_buffer) { | |
3128 | rsp->sense_data_len = | |
3129 | cpu_to_be32(se_cmd->scsi_sense_length); | |
3130 | rsp->flags |= SRP_RSP_FLAG_SNSVALID; | |
3131 | len += se_cmd->scsi_sense_length; | |
3132 | memcpy(data, se_cmd->sense_buffer, | |
3133 | se_cmd->scsi_sense_length); | |
3134 | } | |
3135 | rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> | |
3136 | UCSOLNT_RESP_SHIFT; | |
3137 | } else if (cmd->flags & CMD_FAST_FAIL) { | |
417dff6c BL |
3138 | dev_dbg(&vscsi->dev, "build_resp: cmd %p, fast fail\n", |
3139 | cmd); | |
88a678bb BL |
3140 | rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> |
3141 | UCSOLNT_RESP_SHIFT; | |
3142 | } else { | |
3143 | rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >> | |
3144 | SCSOLNT_RESP_SHIFT; | |
3145 | } | |
3146 | } else { | |
3147 | /* this is task management */ | |
3148 | rsp->status = 0; | |
3149 | rsp->resp_data_len = cpu_to_be32(4); | |
3150 | rsp->flags |= SRP_RSP_FLAG_RSPVALID; | |
3151 | ||
3152 | switch (se_cmd->se_tmr_req->response) { | |
3153 | case TMR_FUNCTION_COMPLETE: | |
3154 | case TMR_TASK_DOES_NOT_EXIST: | |
3155 | rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_COMPLETE; | |
3156 | rsp->sol_not = (cmd->rsp.sol_not & SCSOLNT) >> | |
3157 | SCSOLNT_RESP_SHIFT; | |
3158 | break; | |
3159 | case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: | |
3160 | case TMR_LUN_DOES_NOT_EXIST: | |
3161 | rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_NOT_SUPPORTED; | |
3162 | rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> | |
3163 | UCSOLNT_RESP_SHIFT; | |
3164 | break; | |
3165 | case TMR_FUNCTION_FAILED: | |
3166 | case TMR_FUNCTION_REJECTED: | |
3167 | default: | |
3168 | rsp_code = SRP_TASK_MANAGEMENT_FUNCTION_FAILED; | |
3169 | rsp->sol_not = (cmd->rsp.sol_not & UCSOLNT) >> | |
3170 | UCSOLNT_RESP_SHIFT; | |
3171 | break; | |
3172 | } | |
3173 | ||
3174 | tsk_status = (u32 *)data; | |
3175 | *tsk_status = cpu_to_be32(rsp_code); | |
3176 | data = (char *)(tsk_status + 1); | |
3177 | len += 4; | |
3178 | } | |
3179 | ||
3180 | dma_wmb(); | |
3181 | rc = h_copy_rdma(len, vscsi->dds.window[LOCAL].liobn, iue->sbuf->dma, | |
3182 | vscsi->dds.window[REMOTE].liobn, | |
3183 | be64_to_cpu(iue->remote_token)); | |
3184 | ||
3185 | switch (rc) { | |
3186 | case H_SUCCESS: | |
3187 | vscsi->credit = 0; | |
3188 | *len_p = len; | |
3189 | break; | |
3190 | case H_PERMISSION: | |
3191 | if (connection_broken(vscsi)) | |
3192 | vscsi->flags |= RESPONSE_Q_DOWN | CLIENT_FAILED; | |
3193 | ||
3194 | dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld, flags 0x%x, state 0x%hx\n", | |
3195 | rc, vscsi->flags, vscsi->state); | |
3196 | break; | |
3197 | case H_SOURCE_PARM: | |
3198 | case H_DEST_PARM: | |
3199 | default: | |
3200 | dev_err(&vscsi->dev, "build_response: error copying to client, rc %ld\n", | |
3201 | rc); | |
3202 | break; | |
3203 | } | |
3204 | ||
3205 | spin_unlock_bh(&vscsi->intr_lock); | |
3206 | ||
3207 | return rc; | |
3208 | } | |
3209 | ||
3210 | static int ibmvscsis_rdma(struct ibmvscsis_cmd *cmd, struct scatterlist *sg, | |
3211 | int nsg, struct srp_direct_buf *md, int nmd, | |
3212 | enum dma_data_direction dir, unsigned int bytes) | |
3213 | { | |
3214 | struct iu_entry *iue = cmd->iue; | |
3215 | struct srp_target *target = iue->target; | |
3216 | struct scsi_info *vscsi = target->ldata; | |
3217 | struct scatterlist *sgp; | |
3218 | dma_addr_t client_ioba, server_ioba; | |
3219 | ulong buf_len; | |
3220 | ulong client_len, server_len; | |
3221 | int md_idx; | |
3222 | long tx_len; | |
3223 | long rc = 0; | |
3224 | ||
88a678bb BL |
3225 | if (bytes == 0) |
3226 | return 0; | |
3227 | ||
3228 | sgp = sg; | |
3229 | client_len = 0; | |
3230 | server_len = 0; | |
3231 | md_idx = 0; | |
3232 | tx_len = bytes; | |
3233 | ||
3234 | do { | |
3235 | if (client_len == 0) { | |
3236 | if (md_idx >= nmd) { | |
3237 | dev_err(&vscsi->dev, "rdma: ran out of client memory descriptors\n"); | |
3238 | rc = -EIO; | |
3239 | break; | |
3240 | } | |
3241 | client_ioba = be64_to_cpu(md[md_idx].va); | |
3242 | client_len = be32_to_cpu(md[md_idx].len); | |
3243 | } | |
3244 | if (server_len == 0) { | |
3245 | if (!sgp) { | |
3246 | dev_err(&vscsi->dev, "rdma: ran out of scatter/gather list\n"); | |
3247 | rc = -EIO; | |
3248 | break; | |
3249 | } | |
3250 | server_ioba = sg_dma_address(sgp); | |
3251 | server_len = sg_dma_len(sgp); | |
3252 | } | |
3253 | ||
3254 | buf_len = tx_len; | |
3255 | ||
3256 | if (buf_len > client_len) | |
3257 | buf_len = client_len; | |
3258 | ||
3259 | if (buf_len > server_len) | |
3260 | buf_len = server_len; | |
3261 | ||
3262 | if (buf_len > max_vdma_size) | |
3263 | buf_len = max_vdma_size; | |
3264 | ||
3265 | if (dir == DMA_TO_DEVICE) { | |
3266 | /* read from client */ | |
3267 | rc = h_copy_rdma(buf_len, | |
3268 | vscsi->dds.window[REMOTE].liobn, | |
3269 | client_ioba, | |
3270 | vscsi->dds.window[LOCAL].liobn, | |
3271 | server_ioba); | |
3272 | } else { | |
88a678bb BL |
3273 | /* The h_copy_rdma will cause phyp, running in another |
3274 | * partition, to read memory, so we need to make sure | |
3275 | * the data has been written out, hence these syncs. | |
3276 | */ | |
3277 | /* ensure that everything is in memory */ | |
3278 | isync(); | |
3279 | /* ensure that memory has been made visible */ | |
3280 | dma_wmb(); | |
3281 | rc = h_copy_rdma(buf_len, | |
3282 | vscsi->dds.window[LOCAL].liobn, | |
3283 | server_ioba, | |
3284 | vscsi->dds.window[REMOTE].liobn, | |
3285 | client_ioba); | |
3286 | } | |
3287 | switch (rc) { | |
3288 | case H_SUCCESS: | |
3289 | break; | |
3290 | case H_PERMISSION: | |
3291 | case H_SOURCE_PARM: | |
3292 | case H_DEST_PARM: | |
3293 | if (connection_broken(vscsi)) { | |
3294 | spin_lock_bh(&vscsi->intr_lock); | |
3295 | vscsi->flags |= | |
3296 | (RESPONSE_Q_DOWN | CLIENT_FAILED); | |
3297 | spin_unlock_bh(&vscsi->intr_lock); | |
3298 | } | |
3299 | dev_err(&vscsi->dev, "rdma: h_copy_rdma failed, rc %ld\n", | |
3300 | rc); | |
3301 | break; | |
3302 | ||
3303 | default: | |
3304 | dev_err(&vscsi->dev, "rdma: unknown error %ld from h_copy_rdma\n", | |
3305 | rc); | |
3306 | break; | |
3307 | } | |
3308 | ||
3309 | if (!rc) { | |
3310 | tx_len -= buf_len; | |
3311 | if (tx_len) { | |
3312 | client_len -= buf_len; | |
3313 | if (client_len == 0) | |
3314 | md_idx++; | |
3315 | else | |
3316 | client_ioba += buf_len; | |
3317 | ||
3318 | server_len -= buf_len; | |
3319 | if (server_len == 0) | |
3320 | sgp = sg_next(sgp); | |
3321 | else | |
3322 | server_ioba += buf_len; | |
3323 | } else { | |
3324 | break; | |
3325 | } | |
3326 | } | |
3327 | } while (!rc); | |
3328 | ||
3329 | return rc; | |
3330 | } | |
3331 | ||
3332 | /** | |
3333 | * ibmvscsis_handle_crq() - Handle CRQ | |
3334 | * @data: Pointer to our adapter structure | |
3335 | * | |
3336 | * Read the command elements from the command queue and copy the payloads | |
3337 | * associated with the command elements to local memory and execute the | |
3338 | * SRP requests. | |
3339 | * | |
3340 | * Note: this is an edge triggered interrupt. It can not be shared. | |
3341 | */ | |
3342 | static void ibmvscsis_handle_crq(unsigned long data) | |
3343 | { | |
3344 | struct scsi_info *vscsi = (struct scsi_info *)data; | |
3345 | struct viosrp_crq *crq; | |
3346 | long rc; | |
3347 | bool ack = true; | |
3348 | volatile u8 valid; | |
3349 | ||
3350 | spin_lock_bh(&vscsi->intr_lock); | |
3351 | ||
417dff6c | 3352 | dev_dbg(&vscsi->dev, "got interrupt\n"); |
88a678bb BL |
3353 | |
3354 | /* | |
3355 | * if we are in a path where we are waiting for all pending commands | |
3356 | * to complete because we received a transport event and anything in | |
79fac9c9 | 3357 | * the command queue is for a new connection, do nothing |
88a678bb BL |
3358 | */ |
3359 | if (TARGET_STOP(vscsi)) { | |
3360 | vio_enable_interrupts(vscsi->dma_dev); | |
3361 | ||
417dff6c BL |
3362 | dev_dbg(&vscsi->dev, "handle_crq, don't process: flags 0x%x, state 0x%hx\n", |
3363 | vscsi->flags, vscsi->state); | |
88a678bb BL |
3364 | spin_unlock_bh(&vscsi->intr_lock); |
3365 | return; | |
3366 | } | |
3367 | ||
3368 | rc = vscsi->flags & SCHEDULE_DISCONNECT; | |
3369 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
3370 | valid = crq->valid; | |
3371 | dma_rmb(); | |
3372 | ||
3373 | while (valid) { | |
3374 | /* | |
3375 | * These are edege triggered interrupts. After dropping out of | |
3376 | * the while loop, the code must check for work since an | |
3377 | * interrupt could be lost, and an elment be left on the queue, | |
3378 | * hence the label. | |
3379 | */ | |
3380 | cmd_work: | |
3381 | vscsi->cmd_q.index = | |
3382 | (vscsi->cmd_q.index + 1) & vscsi->cmd_q.mask; | |
3383 | ||
3384 | if (!rc) { | |
3385 | rc = ibmvscsis_parse_command(vscsi, crq); | |
3386 | } else { | |
3387 | if ((uint)crq->valid == VALID_TRANS_EVENT) { | |
3388 | /* | |
3389 | * must service the transport layer events even | |
3390 | * in an error state, dont break out until all | |
3391 | * the consecutive transport events have been | |
3392 | * processed | |
3393 | */ | |
3394 | rc = ibmvscsis_trans_event(vscsi, crq); | |
3395 | } else if (vscsi->flags & TRANS_EVENT) { | |
3396 | /* | |
81290215 | 3397 | * if a transport event has occurred leave |
88a678bb | 3398 | * everything but transport events on the queue |
81290215 | 3399 | * |
88a678bb | 3400 | * need to decrement the queue index so we can |
79fac9c9 | 3401 | * look at the element again |
88a678bb BL |
3402 | */ |
3403 | if (vscsi->cmd_q.index) | |
3404 | vscsi->cmd_q.index -= 1; | |
3405 | else | |
3406 | /* | |
3407 | * index is at 0 it just wrapped. | |
3408 | * have it index last element in q | |
3409 | */ | |
3410 | vscsi->cmd_q.index = vscsi->cmd_q.mask; | |
3411 | break; | |
3412 | } | |
3413 | } | |
3414 | ||
3415 | crq->valid = INVALIDATE_CMD_RESP_EL; | |
3416 | ||
3417 | crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index; | |
3418 | valid = crq->valid; | |
3419 | dma_rmb(); | |
3420 | } | |
3421 | ||
3422 | if (!rc) { | |
3423 | if (ack) { | |
3424 | vio_enable_interrupts(vscsi->dma_dev); | |
3425 | ack = false; | |
417dff6c | 3426 | dev_dbg(&vscsi->dev, "handle_crq, reenabling interrupts\n"); |
88a678bb BL |
3427 | } |
3428 | valid = crq->valid; | |
3429 | dma_rmb(); | |
3430 | if (valid) | |
3431 | goto cmd_work; | |
3432 | } else { | |
417dff6c BL |
3433 | dev_dbg(&vscsi->dev, "handle_crq, error: flags 0x%x, state 0x%hx, crq index 0x%x\n", |
3434 | vscsi->flags, vscsi->state, vscsi->cmd_q.index); | |
88a678bb BL |
3435 | } |
3436 | ||
417dff6c BL |
3437 | dev_dbg(&vscsi->dev, "Leaving handle_crq: schedule_q empty %d, flags 0x%x, state 0x%hx\n", |
3438 | (int)list_empty(&vscsi->schedule_q), vscsi->flags, | |
3439 | vscsi->state); | |
88a678bb BL |
3440 | |
3441 | spin_unlock_bh(&vscsi->intr_lock); | |
3442 | } | |
3443 | ||
3444 | static int ibmvscsis_probe(struct vio_dev *vdev, | |
3445 | const struct vio_device_id *id) | |
3446 | { | |
3447 | struct scsi_info *vscsi; | |
3448 | int rc = 0; | |
3449 | long hrc = 0; | |
3450 | char wq_name[24]; | |
3451 | ||
3452 | vscsi = kzalloc(sizeof(*vscsi), GFP_KERNEL); | |
3453 | if (!vscsi) { | |
3454 | rc = -ENOMEM; | |
417dff6c | 3455 | dev_err(&vdev->dev, "probe: allocation of adapter failed\n"); |
88a678bb BL |
3456 | return rc; |
3457 | } | |
3458 | ||
3459 | vscsi->dma_dev = vdev; | |
3460 | vscsi->dev = vdev->dev; | |
3461 | INIT_LIST_HEAD(&vscsi->schedule_q); | |
3462 | INIT_LIST_HEAD(&vscsi->waiting_rsp); | |
3463 | INIT_LIST_HEAD(&vscsi->active_q); | |
3464 | ||
11950d70 MC |
3465 | snprintf(vscsi->tport.tport_name, IBMVSCSIS_NAMELEN, "%s", |
3466 | dev_name(&vdev->dev)); | |
88a678bb | 3467 | |
417dff6c | 3468 | dev_dbg(&vscsi->dev, "probe tport_name: %s\n", vscsi->tport.tport_name); |
88a678bb BL |
3469 | |
3470 | rc = read_dma_window(vscsi); | |
3471 | if (rc) | |
3472 | goto free_adapter; | |
417dff6c BL |
3473 | dev_dbg(&vscsi->dev, "Probe: liobn 0x%x, riobn 0x%x\n", |
3474 | vscsi->dds.window[LOCAL].liobn, | |
3475 | vscsi->dds.window[REMOTE].liobn); | |
88a678bb | 3476 | |
d792d4c4 | 3477 | snprintf(vscsi->eye, sizeof(vscsi->eye), "VSCSI %s", vdev->name); |
88a678bb BL |
3478 | |
3479 | vscsi->dds.unit_id = vdev->unit_address; | |
adad633a | 3480 | strscpy(vscsi->dds.partition_name, partition_name, |
9c93cf03 MC |
3481 | sizeof(vscsi->dds.partition_name)); |
3482 | vscsi->dds.partition_num = partition_number; | |
88a678bb BL |
3483 | |
3484 | spin_lock_bh(&ibmvscsis_dev_lock); | |
3485 | list_add_tail(&vscsi->list, &ibmvscsis_dev_list); | |
3486 | spin_unlock_bh(&ibmvscsis_dev_lock); | |
3487 | ||
3488 | /* | |
3489 | * TBD: How do we determine # of cmds to request? Do we know how | |
3490 | * many "children" we have? | |
3491 | */ | |
3492 | vscsi->request_limit = INITIAL_SRP_LIMIT; | |
3493 | rc = srp_target_alloc(&vscsi->target, &vdev->dev, vscsi->request_limit, | |
3494 | SRP_MAX_IU_LEN); | |
3495 | if (rc) | |
3496 | goto rem_list; | |
3497 | ||
3498 | vscsi->target.ldata = vscsi; | |
3499 | ||
3500 | rc = ibmvscsis_alloc_cmds(vscsi, vscsi->request_limit); | |
3501 | if (rc) { | |
3502 | dev_err(&vscsi->dev, "alloc_cmds failed, rc %d, num %d\n", | |
3503 | rc, vscsi->request_limit); | |
3504 | goto free_target; | |
3505 | } | |
3506 | ||
3507 | /* | |
3508 | * Note: the lock is used in freeing timers, so must initialize | |
3509 | * first so that ordering in case of error is correct. | |
3510 | */ | |
3511 | spin_lock_init(&vscsi->intr_lock); | |
3512 | ||
3513 | rc = ibmvscsis_alloctimer(vscsi); | |
3514 | if (rc) { | |
3515 | dev_err(&vscsi->dev, "probe: alloctimer failed, rc %d\n", rc); | |
3516 | goto free_cmds; | |
3517 | } | |
3518 | ||
3519 | rc = ibmvscsis_create_command_q(vscsi, 256); | |
3520 | if (rc) { | |
3521 | dev_err(&vscsi->dev, "probe: create_command_q failed, rc %d\n", | |
3522 | rc); | |
3523 | goto free_timer; | |
3524 | } | |
3525 | ||
3526 | vscsi->map_buf = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
3527 | if (!vscsi->map_buf) { | |
3528 | rc = -ENOMEM; | |
3529 | dev_err(&vscsi->dev, "probe: allocating cmd buffer failed\n"); | |
3530 | goto destroy_queue; | |
3531 | } | |
3532 | ||
3533 | vscsi->map_ioba = dma_map_single(&vdev->dev, vscsi->map_buf, PAGE_SIZE, | |
3534 | DMA_BIDIRECTIONAL); | |
3535 | if (dma_mapping_error(&vdev->dev, vscsi->map_ioba)) { | |
38247feb | 3536 | rc = -ENOMEM; |
88a678bb BL |
3537 | dev_err(&vscsi->dev, "probe: error mapping command buffer\n"); |
3538 | goto free_buf; | |
3539 | } | |
3540 | ||
3541 | hrc = h_vioctl(vscsi->dds.unit_id, H_GET_PARTNER_INFO, | |
3542 | (u64)vscsi->map_ioba | ((u64)PAGE_SIZE << 32), 0, 0, 0, | |
3543 | 0); | |
3544 | if (hrc == H_SUCCESS) | |
3545 | vscsi->client_data.partition_number = | |
3546 | be64_to_cpu(*(u64 *)vscsi->map_buf); | |
3547 | /* | |
3548 | * We expect the VIOCTL to fail if we're configured as "any | |
3549 | * client can connect" and the client isn't activated yet. | |
3550 | * We'll make the call again when he sends an init msg. | |
3551 | */ | |
417dff6c BL |
3552 | dev_dbg(&vscsi->dev, "probe hrc %ld, client partition num %d\n", |
3553 | hrc, vscsi->client_data.partition_number); | |
88a678bb BL |
3554 | |
3555 | tasklet_init(&vscsi->work_task, ibmvscsis_handle_crq, | |
3556 | (unsigned long)vscsi); | |
3557 | ||
3558 | init_completion(&vscsi->wait_idle); | |
8bf11557 | 3559 | init_completion(&vscsi->unconfig); |
88a678bb BL |
3560 | |
3561 | snprintf(wq_name, 24, "ibmvscsis%s", dev_name(&vdev->dev)); | |
3562 | vscsi->work_q = create_workqueue(wq_name); | |
3563 | if (!vscsi->work_q) { | |
3564 | rc = -ENOMEM; | |
3565 | dev_err(&vscsi->dev, "create_workqueue failed\n"); | |
3566 | goto unmap_buf; | |
3567 | } | |
3568 | ||
3569 | rc = request_irq(vdev->irq, ibmvscsis_interrupt, 0, "ibmvscsis", vscsi); | |
3570 | if (rc) { | |
3571 | rc = -EPERM; | |
3572 | dev_err(&vscsi->dev, "probe: request_irq failed, rc %d\n", rc); | |
3573 | goto destroy_WQ; | |
3574 | } | |
3575 | ||
c9b3379f | 3576 | vscsi->state = WAIT_ENABLED; |
88a678bb BL |
3577 | |
3578 | dev_set_drvdata(&vdev->dev, vscsi); | |
3579 | ||
3580 | return 0; | |
3581 | ||
88a678bb BL |
3582 | destroy_WQ: |
3583 | destroy_workqueue(vscsi->work_q); | |
3584 | unmap_buf: | |
3585 | dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE, | |
3586 | DMA_BIDIRECTIONAL); | |
3587 | free_buf: | |
3588 | kfree(vscsi->map_buf); | |
3589 | destroy_queue: | |
3590 | tasklet_kill(&vscsi->work_task); | |
3591 | ibmvscsis_unregister_command_q(vscsi); | |
3592 | ibmvscsis_destroy_command_q(vscsi); | |
3593 | free_timer: | |
3594 | ibmvscsis_freetimer(vscsi); | |
3595 | free_cmds: | |
3596 | ibmvscsis_free_cmds(vscsi); | |
3597 | free_target: | |
3598 | srp_target_free(&vscsi->target); | |
3599 | rem_list: | |
3600 | spin_lock_bh(&ibmvscsis_dev_lock); | |
3601 | list_del(&vscsi->list); | |
3602 | spin_unlock_bh(&ibmvscsis_dev_lock); | |
3603 | free_adapter: | |
3604 | kfree(vscsi); | |
3605 | ||
3606 | return rc; | |
3607 | } | |
3608 | ||
3609 | static int ibmvscsis_remove(struct vio_dev *vdev) | |
3610 | { | |
3611 | struct scsi_info *vscsi = dev_get_drvdata(&vdev->dev); | |
3612 | ||
417dff6c | 3613 | dev_dbg(&vscsi->dev, "remove (%s)\n", dev_name(&vscsi->dma_dev->dev)); |
88a678bb | 3614 | |
8bf11557 MC |
3615 | spin_lock_bh(&vscsi->intr_lock); |
3616 | ibmvscsis_post_disconnect(vscsi, UNCONFIGURING, 0); | |
3617 | vscsi->flags |= CFG_SLEEPING; | |
3618 | spin_unlock_bh(&vscsi->intr_lock); | |
3619 | wait_for_completion(&vscsi->unconfig); | |
88a678bb BL |
3620 | |
3621 | vio_disable_interrupts(vdev); | |
3622 | free_irq(vdev->irq, vscsi); | |
3623 | destroy_workqueue(vscsi->work_q); | |
3624 | dma_unmap_single(&vdev->dev, vscsi->map_ioba, PAGE_SIZE, | |
3625 | DMA_BIDIRECTIONAL); | |
3626 | kfree(vscsi->map_buf); | |
3627 | tasklet_kill(&vscsi->work_task); | |
88a678bb BL |
3628 | ibmvscsis_destroy_command_q(vscsi); |
3629 | ibmvscsis_freetimer(vscsi); | |
3630 | ibmvscsis_free_cmds(vscsi); | |
3631 | srp_target_free(&vscsi->target); | |
3632 | spin_lock_bh(&ibmvscsis_dev_lock); | |
3633 | list_del(&vscsi->list); | |
3634 | spin_unlock_bh(&ibmvscsis_dev_lock); | |
3635 | kfree(vscsi); | |
3636 | ||
3637 | return 0; | |
3638 | } | |
3639 | ||
3640 | static ssize_t system_id_show(struct device *dev, | |
3641 | struct device_attribute *attr, char *buf) | |
3642 | { | |
3643 | return snprintf(buf, PAGE_SIZE, "%s\n", system_id); | |
3644 | } | |
3645 | ||
3646 | static ssize_t partition_number_show(struct device *dev, | |
3647 | struct device_attribute *attr, char *buf) | |
3648 | { | |
3649 | return snprintf(buf, PAGE_SIZE, "%x\n", partition_number); | |
3650 | } | |
3651 | ||
3652 | static ssize_t unit_address_show(struct device *dev, | |
3653 | struct device_attribute *attr, char *buf) | |
3654 | { | |
3655 | struct scsi_info *vscsi = container_of(dev, struct scsi_info, dev); | |
3656 | ||
3657 | return snprintf(buf, PAGE_SIZE, "%x\n", vscsi->dma_dev->unit_address); | |
3658 | } | |
3659 | ||
3660 | static int ibmvscsis_get_system_info(void) | |
3661 | { | |
3662 | struct device_node *rootdn, *vdevdn; | |
3663 | const char *id, *model, *name; | |
3664 | const uint *num; | |
3665 | ||
3666 | rootdn = of_find_node_by_path("/"); | |
3667 | if (!rootdn) | |
3668 | return -ENOENT; | |
3669 | ||
3670 | model = of_get_property(rootdn, "model", NULL); | |
3671 | id = of_get_property(rootdn, "system-id", NULL); | |
3672 | if (model && id) | |
3673 | snprintf(system_id, sizeof(system_id), "%s-%s", model, id); | |
3674 | ||
3675 | name = of_get_property(rootdn, "ibm,partition-name", NULL); | |
3676 | if (name) | |
3677 | strncpy(partition_name, name, sizeof(partition_name)); | |
3678 | ||
3679 | num = of_get_property(rootdn, "ibm,partition-no", NULL); | |
3680 | if (num) | |
9c93cf03 | 3681 | partition_number = of_read_number(num, 1); |
88a678bb BL |
3682 | |
3683 | of_node_put(rootdn); | |
3684 | ||
3685 | vdevdn = of_find_node_by_path("/vdevice"); | |
3686 | if (vdevdn) { | |
3687 | const uint *mvds; | |
3688 | ||
3689 | mvds = of_get_property(vdevdn, "ibm,max-virtual-dma-size", | |
3690 | NULL); | |
3691 | if (mvds) | |
3692 | max_vdma_size = *mvds; | |
3693 | of_node_put(vdevdn); | |
3694 | } | |
3695 | ||
3696 | return 0; | |
3697 | } | |
3698 | ||
3699 | static char *ibmvscsis_get_fabric_name(void) | |
3700 | { | |
3701 | return "ibmvscsis"; | |
3702 | } | |
3703 | ||
3704 | static char *ibmvscsis_get_fabric_wwn(struct se_portal_group *se_tpg) | |
3705 | { | |
3706 | struct ibmvscsis_tport *tport = | |
3707 | container_of(se_tpg, struct ibmvscsis_tport, se_tpg); | |
3708 | ||
3709 | return tport->tport_name; | |
3710 | } | |
3711 | ||
3712 | static u16 ibmvscsis_get_tag(struct se_portal_group *se_tpg) | |
3713 | { | |
3714 | struct ibmvscsis_tport *tport = | |
3715 | container_of(se_tpg, struct ibmvscsis_tport, se_tpg); | |
3716 | ||
3717 | return tport->tport_tpgt; | |
3718 | } | |
3719 | ||
3720 | static u32 ibmvscsis_get_default_depth(struct se_portal_group *se_tpg) | |
3721 | { | |
3722 | return 1; | |
3723 | } | |
3724 | ||
3725 | static int ibmvscsis_check_true(struct se_portal_group *se_tpg) | |
3726 | { | |
3727 | return 1; | |
3728 | } | |
3729 | ||
3730 | static int ibmvscsis_check_false(struct se_portal_group *se_tpg) | |
3731 | { | |
3732 | return 0; | |
3733 | } | |
3734 | ||
3735 | static u32 ibmvscsis_tpg_get_inst_index(struct se_portal_group *se_tpg) | |
3736 | { | |
3737 | return 1; | |
3738 | } | |
3739 | ||
3740 | static int ibmvscsis_check_stop_free(struct se_cmd *se_cmd) | |
3741 | { | |
3742 | return target_put_sess_cmd(se_cmd); | |
3743 | } | |
3744 | ||
3745 | static void ibmvscsis_release_cmd(struct se_cmd *se_cmd) | |
3746 | { | |
3747 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3748 | se_cmd); | |
3749 | struct scsi_info *vscsi = cmd->adapter; | |
3750 | ||
88a678bb BL |
3751 | spin_lock_bh(&vscsi->intr_lock); |
3752 | /* Remove from active_q */ | |
980b3271 | 3753 | list_move_tail(&cmd->list, &vscsi->waiting_rsp); |
88a678bb BL |
3754 | ibmvscsis_send_messages(vscsi); |
3755 | spin_unlock_bh(&vscsi->intr_lock); | |
3756 | } | |
3757 | ||
3758 | static u32 ibmvscsis_sess_get_index(struct se_session *se_sess) | |
3759 | { | |
3760 | return 0; | |
3761 | } | |
3762 | ||
3763 | static int ibmvscsis_write_pending(struct se_cmd *se_cmd) | |
3764 | { | |
3765 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3766 | se_cmd); | |
25e78531 | 3767 | struct scsi_info *vscsi = cmd->adapter; |
88a678bb BL |
3768 | struct iu_entry *iue = cmd->iue; |
3769 | int rc; | |
3770 | ||
25e78531 BL |
3771 | /* |
3772 | * If CLIENT_FAILED OR RESPONSE_Q_DOWN, then just return success | |
3773 | * since LIO can't do anything about it, and we dont want to | |
3774 | * attempt an srp_transfer_data. | |
3775 | */ | |
3776 | if ((vscsi->flags & (CLIENT_FAILED | RESPONSE_Q_DOWN))) { | |
417dff6c BL |
3777 | dev_err(&vscsi->dev, "write_pending failed since: %d\n", |
3778 | vscsi->flags); | |
88e65389 | 3779 | return -EIO; |
417dff6c | 3780 | |
25e78531 BL |
3781 | } |
3782 | ||
88a678bb BL |
3783 | rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma, |
3784 | 1, 1); | |
3785 | if (rc) { | |
417dff6c | 3786 | dev_err(&vscsi->dev, "srp_transfer_data() failed: %d\n", rc); |
7c9d8d0c | 3787 | return -EIO; |
88a678bb BL |
3788 | } |
3789 | /* | |
3790 | * We now tell TCM to add this WRITE CDB directly into the TCM storage | |
3791 | * object execution queue. | |
3792 | */ | |
3793 | target_execute_cmd(se_cmd); | |
3794 | return 0; | |
3795 | } | |
3796 | ||
3797 | static int ibmvscsis_write_pending_status(struct se_cmd *se_cmd) | |
3798 | { | |
3799 | return 0; | |
3800 | } | |
3801 | ||
3802 | static void ibmvscsis_set_default_node_attrs(struct se_node_acl *nacl) | |
3803 | { | |
3804 | } | |
3805 | ||
3806 | static int ibmvscsis_get_cmd_state(struct se_cmd *se_cmd) | |
3807 | { | |
3808 | return 0; | |
3809 | } | |
3810 | ||
3811 | static int ibmvscsis_queue_data_in(struct se_cmd *se_cmd) | |
3812 | { | |
3813 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3814 | se_cmd); | |
3815 | struct iu_entry *iue = cmd->iue; | |
3816 | struct scsi_info *vscsi = cmd->adapter; | |
3817 | char *sd; | |
3818 | uint len = 0; | |
3819 | int rc; | |
3820 | ||
88a678bb BL |
3821 | rc = srp_transfer_data(cmd, &vio_iu(iue)->srp.cmd, ibmvscsis_rdma, 1, |
3822 | 1); | |
3823 | if (rc) { | |
417dff6c | 3824 | dev_err(&vscsi->dev, "srp_transfer_data failed: %d\n", rc); |
88a678bb BL |
3825 | sd = se_cmd->sense_buffer; |
3826 | se_cmd->scsi_sense_length = 18; | |
3827 | memset(se_cmd->sense_buffer, 0, se_cmd->scsi_sense_length); | |
3828 | /* Logical Unit Communication Time-out asc/ascq = 0x0801 */ | |
3829 | scsi_build_sense_buffer(0, se_cmd->sense_buffer, MEDIUM_ERROR, | |
3830 | 0x08, 0x01); | |
3831 | } | |
3832 | ||
3833 | srp_build_response(vscsi, cmd, &len); | |
3834 | cmd->rsp.format = SRP_FORMAT; | |
3835 | cmd->rsp.len = len; | |
3836 | ||
3837 | return 0; | |
3838 | } | |
3839 | ||
3840 | static int ibmvscsis_queue_status(struct se_cmd *se_cmd) | |
3841 | { | |
3842 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3843 | se_cmd); | |
3844 | struct scsi_info *vscsi = cmd->adapter; | |
3845 | uint len; | |
3846 | ||
417dff6c | 3847 | dev_dbg(&vscsi->dev, "queue_status %p\n", se_cmd); |
88a678bb BL |
3848 | |
3849 | srp_build_response(vscsi, cmd, &len); | |
3850 | cmd->rsp.format = SRP_FORMAT; | |
3851 | cmd->rsp.len = len; | |
3852 | ||
3853 | return 0; | |
3854 | } | |
3855 | ||
3856 | static void ibmvscsis_queue_tm_rsp(struct se_cmd *se_cmd) | |
3857 | { | |
3858 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, | |
3859 | se_cmd); | |
3860 | struct scsi_info *vscsi = cmd->adapter; | |
25e78531 BL |
3861 | struct ibmvscsis_cmd *cmd_itr; |
3862 | struct iu_entry *iue = iue = cmd->iue; | |
3863 | struct srp_tsk_mgmt *srp_tsk = &vio_iu(iue)->srp.tsk_mgmt; | |
3864 | u64 tag_to_abort = be64_to_cpu(srp_tsk->task_tag); | |
88a678bb BL |
3865 | uint len; |
3866 | ||
417dff6c BL |
3867 | dev_dbg(&vscsi->dev, "queue_tm_rsp %p, status %d\n", |
3868 | se_cmd, (int)se_cmd->se_tmr_req->response); | |
88a678bb | 3869 | |
25e78531 BL |
3870 | if (srp_tsk->tsk_mgmt_func == SRP_TSK_ABORT_TASK && |
3871 | cmd->se_cmd.se_tmr_req->response == TMR_TASK_DOES_NOT_EXIST) { | |
3872 | spin_lock_bh(&vscsi->intr_lock); | |
3873 | list_for_each_entry(cmd_itr, &vscsi->active_q, list) { | |
3874 | if (tag_to_abort == cmd_itr->se_cmd.tag) { | |
3875 | cmd_itr->abort_cmd = cmd; | |
3876 | cmd->flags |= DELAY_SEND; | |
3877 | break; | |
3878 | } | |
3879 | } | |
3880 | spin_unlock_bh(&vscsi->intr_lock); | |
3881 | } | |
3882 | ||
88a678bb BL |
3883 | srp_build_response(vscsi, cmd, &len); |
3884 | cmd->rsp.format = SRP_FORMAT; | |
3885 | cmd->rsp.len = len; | |
3886 | } | |
3887 | ||
3888 | static void ibmvscsis_aborted_task(struct se_cmd *se_cmd) | |
3889 | { | |
417dff6c BL |
3890 | struct ibmvscsis_cmd *cmd = container_of(se_cmd, struct ibmvscsis_cmd, |
3891 | se_cmd); | |
3892 | struct scsi_info *vscsi = cmd->adapter; | |
3893 | ||
3894 | dev_dbg(&vscsi->dev, "ibmvscsis_aborted_task %p task_tag: %llu\n", | |
3895 | se_cmd, se_cmd->tag); | |
88a678bb BL |
3896 | } |
3897 | ||
3898 | static struct se_wwn *ibmvscsis_make_tport(struct target_fabric_configfs *tf, | |
3899 | struct config_group *group, | |
3900 | const char *name) | |
3901 | { | |
3902 | struct ibmvscsis_tport *tport; | |
417dff6c | 3903 | struct scsi_info *vscsi; |
88a678bb BL |
3904 | |
3905 | tport = ibmvscsis_lookup_port(name); | |
3906 | if (tport) { | |
417dff6c | 3907 | vscsi = container_of(tport, struct scsi_info, tport); |
88a678bb | 3908 | tport->tport_proto_id = SCSI_PROTOCOL_SRP; |
417dff6c BL |
3909 | dev_dbg(&vscsi->dev, "make_tport(%s), pointer:%p, tport_id:%x\n", |
3910 | name, tport, tport->tport_proto_id); | |
88a678bb BL |
3911 | return &tport->tport_wwn; |
3912 | } | |
3913 | ||
3914 | return ERR_PTR(-EINVAL); | |
3915 | } | |
3916 | ||
3917 | static void ibmvscsis_drop_tport(struct se_wwn *wwn) | |
3918 | { | |
3919 | struct ibmvscsis_tport *tport = container_of(wwn, | |
3920 | struct ibmvscsis_tport, | |
3921 | tport_wwn); | |
417dff6c | 3922 | struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport); |
88a678bb | 3923 | |
417dff6c BL |
3924 | dev_dbg(&vscsi->dev, "drop_tport(%s)\n", |
3925 | config_item_name(&tport->tport_wwn.wwn_group.cg_item)); | |
88a678bb BL |
3926 | } |
3927 | ||
3928 | static struct se_portal_group *ibmvscsis_make_tpg(struct se_wwn *wwn, | |
88a678bb BL |
3929 | const char *name) |
3930 | { | |
3931 | struct ibmvscsis_tport *tport = | |
3932 | container_of(wwn, struct ibmvscsis_tport, tport_wwn); | |
e9447a46 | 3933 | u16 tpgt; |
88a678bb BL |
3934 | int rc; |
3935 | ||
e9447a46 BL |
3936 | if (strstr(name, "tpgt_") != name) |
3937 | return ERR_PTR(-EINVAL); | |
3938 | rc = kstrtou16(name + 5, 0, &tpgt); | |
3939 | if (rc) | |
3940 | return ERR_PTR(rc); | |
3941 | tport->tport_tpgt = tpgt; | |
3942 | ||
88a678bb BL |
3943 | tport->releasing = false; |
3944 | ||
3945 | rc = core_tpg_register(&tport->tport_wwn, &tport->se_tpg, | |
3946 | tport->tport_proto_id); | |
3947 | if (rc) | |
3948 | return ERR_PTR(rc); | |
3949 | ||
3950 | return &tport->se_tpg; | |
3951 | } | |
3952 | ||
3953 | static void ibmvscsis_drop_tpg(struct se_portal_group *se_tpg) | |
3954 | { | |
3955 | struct ibmvscsis_tport *tport = container_of(se_tpg, | |
3956 | struct ibmvscsis_tport, | |
3957 | se_tpg); | |
3958 | ||
3959 | tport->releasing = true; | |
3960 | tport->enabled = false; | |
3961 | ||
3962 | /* | |
3963 | * Release the virtual I_T Nexus for this ibmvscsis TPG | |
3964 | */ | |
3965 | ibmvscsis_drop_nexus(tport); | |
3966 | /* | |
3967 | * Deregister the se_tpg from TCM.. | |
3968 | */ | |
3969 | core_tpg_deregister(se_tpg); | |
3970 | } | |
3971 | ||
3972 | static ssize_t ibmvscsis_wwn_version_show(struct config_item *item, | |
3973 | char *page) | |
3974 | { | |
3975 | return scnprintf(page, PAGE_SIZE, "%s\n", IBMVSCSIS_VERSION); | |
3976 | } | |
3977 | CONFIGFS_ATTR_RO(ibmvscsis_wwn_, version); | |
3978 | ||
3979 | static struct configfs_attribute *ibmvscsis_wwn_attrs[] = { | |
3980 | &ibmvscsis_wwn_attr_version, | |
3981 | NULL, | |
3982 | }; | |
3983 | ||
3984 | static ssize_t ibmvscsis_tpg_enable_show(struct config_item *item, | |
3985 | char *page) | |
3986 | { | |
3987 | struct se_portal_group *se_tpg = to_tpg(item); | |
3988 | struct ibmvscsis_tport *tport = container_of(se_tpg, | |
3989 | struct ibmvscsis_tport, | |
3990 | se_tpg); | |
3991 | ||
3992 | return snprintf(page, PAGE_SIZE, "%d\n", (tport->enabled) ? 1 : 0); | |
3993 | } | |
3994 | ||
3995 | static ssize_t ibmvscsis_tpg_enable_store(struct config_item *item, | |
3996 | const char *page, size_t count) | |
3997 | { | |
3998 | struct se_portal_group *se_tpg = to_tpg(item); | |
3999 | struct ibmvscsis_tport *tport = container_of(se_tpg, | |
4000 | struct ibmvscsis_tport, | |
4001 | se_tpg); | |
4002 | struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport); | |
4003 | unsigned long tmp; | |
4004 | int rc; | |
4005 | long lrc; | |
4006 | ||
4007 | rc = kstrtoul(page, 0, &tmp); | |
4008 | if (rc < 0) { | |
417dff6c | 4009 | dev_err(&vscsi->dev, "Unable to extract srpt_tpg_store_enable\n"); |
88a678bb BL |
4010 | return -EINVAL; |
4011 | } | |
4012 | ||
4013 | if ((tmp != 0) && (tmp != 1)) { | |
417dff6c | 4014 | dev_err(&vscsi->dev, "Illegal value for srpt_tpg_store_enable\n"); |
88a678bb BL |
4015 | return -EINVAL; |
4016 | } | |
4017 | ||
4018 | if (tmp) { | |
88a678bb | 4019 | spin_lock_bh(&vscsi->intr_lock); |
c9b3379f | 4020 | tport->enabled = true; |
88a678bb BL |
4021 | lrc = ibmvscsis_enable_change_state(vscsi); |
4022 | if (lrc) | |
417dff6c BL |
4023 | dev_err(&vscsi->dev, "enable_change_state failed, rc %ld state %d\n", |
4024 | lrc, vscsi->state); | |
88a678bb BL |
4025 | spin_unlock_bh(&vscsi->intr_lock); |
4026 | } else { | |
c9b3379f | 4027 | spin_lock_bh(&vscsi->intr_lock); |
88a678bb | 4028 | tport->enabled = false; |
c9b3379f MC |
4029 | /* This simulates the server going down */ |
4030 | ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT, 0); | |
4031 | spin_unlock_bh(&vscsi->intr_lock); | |
88a678bb BL |
4032 | } |
4033 | ||
417dff6c BL |
4034 | dev_dbg(&vscsi->dev, "tpg_enable_store, tmp %ld, state %d\n", tmp, |
4035 | vscsi->state); | |
88a678bb BL |
4036 | |
4037 | return count; | |
4038 | } | |
4039 | CONFIGFS_ATTR(ibmvscsis_tpg_, enable); | |
4040 | ||
4041 | static struct configfs_attribute *ibmvscsis_tpg_attrs[] = { | |
4042 | &ibmvscsis_tpg_attr_enable, | |
4043 | NULL, | |
4044 | }; | |
4045 | ||
4046 | static const struct target_core_fabric_ops ibmvscsis_ops = { | |
4047 | .module = THIS_MODULE, | |
4048 | .name = "ibmvscsis", | |
b22bc278 | 4049 | .max_data_sg_nents = MAX_TXU / PAGE_SIZE, |
88a678bb BL |
4050 | .get_fabric_name = ibmvscsis_get_fabric_name, |
4051 | .tpg_get_wwn = ibmvscsis_get_fabric_wwn, | |
4052 | .tpg_get_tag = ibmvscsis_get_tag, | |
4053 | .tpg_get_default_depth = ibmvscsis_get_default_depth, | |
4054 | .tpg_check_demo_mode = ibmvscsis_check_true, | |
4055 | .tpg_check_demo_mode_cache = ibmvscsis_check_true, | |
4056 | .tpg_check_demo_mode_write_protect = ibmvscsis_check_false, | |
4057 | .tpg_check_prod_mode_write_protect = ibmvscsis_check_false, | |
4058 | .tpg_get_inst_index = ibmvscsis_tpg_get_inst_index, | |
4059 | .check_stop_free = ibmvscsis_check_stop_free, | |
4060 | .release_cmd = ibmvscsis_release_cmd, | |
4061 | .sess_get_index = ibmvscsis_sess_get_index, | |
4062 | .write_pending = ibmvscsis_write_pending, | |
4063 | .write_pending_status = ibmvscsis_write_pending_status, | |
4064 | .set_default_node_attributes = ibmvscsis_set_default_node_attrs, | |
4065 | .get_cmd_state = ibmvscsis_get_cmd_state, | |
4066 | .queue_data_in = ibmvscsis_queue_data_in, | |
4067 | .queue_status = ibmvscsis_queue_status, | |
4068 | .queue_tm_rsp = ibmvscsis_queue_tm_rsp, | |
4069 | .aborted_task = ibmvscsis_aborted_task, | |
4070 | /* | |
4071 | * Setup function pointers for logic in target_core_fabric_configfs.c | |
4072 | */ | |
4073 | .fabric_make_wwn = ibmvscsis_make_tport, | |
4074 | .fabric_drop_wwn = ibmvscsis_drop_tport, | |
4075 | .fabric_make_tpg = ibmvscsis_make_tpg, | |
4076 | .fabric_drop_tpg = ibmvscsis_drop_tpg, | |
4077 | ||
4078 | .tfc_wwn_attrs = ibmvscsis_wwn_attrs, | |
4079 | .tfc_tpg_base_attrs = ibmvscsis_tpg_attrs, | |
4080 | }; | |
4081 | ||
4082 | static void ibmvscsis_dev_release(struct device *dev) {}; | |
4083 | ||
88a678bb BL |
4084 | static struct device_attribute dev_attr_system_id = |
4085 | __ATTR(system_id, S_IRUGO, system_id_show, NULL); | |
4086 | ||
4087 | static struct device_attribute dev_attr_partition_number = | |
4088 | __ATTR(partition_number, S_IRUGO, partition_number_show, NULL); | |
4089 | ||
4090 | static struct device_attribute dev_attr_unit_address = | |
4091 | __ATTR(unit_address, S_IRUGO, unit_address_show, NULL); | |
4092 | ||
4093 | static struct attribute *ibmvscsis_dev_attrs[] = { | |
4094 | &dev_attr_system_id.attr, | |
4095 | &dev_attr_partition_number.attr, | |
4096 | &dev_attr_unit_address.attr, | |
4097 | }; | |
4098 | ATTRIBUTE_GROUPS(ibmvscsis_dev); | |
4099 | ||
4100 | static struct class ibmvscsis_class = { | |
79fac9c9 MC |
4101 | .name = "ibmvscsis", |
4102 | .dev_release = ibmvscsis_dev_release, | |
79fac9c9 | 4103 | .dev_groups = ibmvscsis_dev_groups, |
88a678bb BL |
4104 | }; |
4105 | ||
e4df3eaa | 4106 | static const struct vio_device_id ibmvscsis_device_table[] = { |
88a678bb BL |
4107 | { "v-scsi-host", "IBM,v-scsi-host" }, |
4108 | { "", "" } | |
4109 | }; | |
4110 | MODULE_DEVICE_TABLE(vio, ibmvscsis_device_table); | |
4111 | ||
4112 | static struct vio_driver ibmvscsis_driver = { | |
4113 | .name = "ibmvscsis", | |
4114 | .id_table = ibmvscsis_device_table, | |
4115 | .probe = ibmvscsis_probe, | |
4116 | .remove = ibmvscsis_remove, | |
4117 | }; | |
4118 | ||
4119 | /* | |
4120 | * ibmvscsis_init() - Kernel Module initialization | |
4121 | * | |
4122 | * Note: vio_register_driver() registers callback functions, and at least one | |
4123 | * of those callback functions calls TCM - Linux IO Target Subsystem, thus | |
4124 | * the SCSI Target template must be registered before vio_register_driver() | |
4125 | * is called. | |
4126 | */ | |
4127 | static int __init ibmvscsis_init(void) | |
4128 | { | |
4129 | int rc = 0; | |
4130 | ||
4131 | rc = ibmvscsis_get_system_info(); | |
4132 | if (rc) { | |
4133 | pr_err("rc %d from get_system_info\n", rc); | |
4134 | goto out; | |
4135 | } | |
4136 | ||
4137 | rc = class_register(&ibmvscsis_class); | |
4138 | if (rc) { | |
4139 | pr_err("failed class register\n"); | |
4140 | goto out; | |
4141 | } | |
4142 | ||
4143 | rc = target_register_template(&ibmvscsis_ops); | |
4144 | if (rc) { | |
4145 | pr_err("rc %d from target_register_template\n", rc); | |
4146 | goto unregister_class; | |
4147 | } | |
4148 | ||
4149 | rc = vio_register_driver(&ibmvscsis_driver); | |
4150 | if (rc) { | |
4151 | pr_err("rc %d from vio_register_driver\n", rc); | |
4152 | goto unregister_target; | |
4153 | } | |
4154 | ||
4155 | return 0; | |
4156 | ||
4157 | unregister_target: | |
4158 | target_unregister_template(&ibmvscsis_ops); | |
4159 | unregister_class: | |
4160 | class_unregister(&ibmvscsis_class); | |
4161 | out: | |
4162 | return rc; | |
4163 | } | |
4164 | ||
4165 | static void __exit ibmvscsis_exit(void) | |
4166 | { | |
4167 | pr_info("Unregister IBM virtual SCSI host driver\n"); | |
4168 | vio_unregister_driver(&ibmvscsis_driver); | |
4169 | target_unregister_template(&ibmvscsis_ops); | |
4170 | class_unregister(&ibmvscsis_class); | |
4171 | } | |
4172 | ||
4173 | MODULE_DESCRIPTION("IBMVSCSIS fabric driver"); | |
4174 | MODULE_AUTHOR("Bryant G. Ly and Michael Cyr"); | |
4175 | MODULE_LICENSE("GPL"); | |
4176 | MODULE_VERSION(IBMVSCSIS_VERSION); | |
4177 | module_init(ibmvscsis_init); | |
4178 | module_exit(ibmvscsis_exit); |