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63#include <linux/module.h>
64#include <linux/moduleparam.h>
65#include <linux/dma-mapping.h>
66#include <linux/delay.h>
67#include <linux/slab.h>
68#include <linux/of.h>
69#include <linux/pm.h>
70#include <linux/kthread.h>
71#include <asm/firmware.h>
72#include <asm/vio.h>
73#include <scsi/scsi.h>
74#include <scsi/scsi_cmnd.h>
75#include <scsi/scsi_host.h>
76#include <scsi/scsi_device.h>
77#include <scsi/scsi_transport_srp.h>
78#include "ibmvscsi.h"
79
80
81
82
83
84
85static int max_id = 64;
86static int max_channel = 3;
87static int init_timeout = 300;
88static int login_timeout = 60;
89static int info_timeout = 30;
90static int abort_timeout = 60;
91static int reset_timeout = 60;
92static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
93static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2;
94static int fast_fail = 1;
95static int client_reserve = 1;
96static char partition_name[97] = "UNKNOWN";
97static unsigned int partition_number = -1;
98static LIST_HEAD(ibmvscsi_head);
99
100static struct scsi_transport_template *ibmvscsi_transport_template;
101
102#define IBMVSCSI_VERSION "1.5.9"
103
104MODULE_DESCRIPTION("IBM Virtual SCSI");
105MODULE_AUTHOR("Dave Boutcher");
106MODULE_LICENSE("GPL");
107MODULE_VERSION(IBMVSCSI_VERSION);
108
109module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
110MODULE_PARM_DESC(max_id, "Largest ID value for each channel [Default=64]");
111module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
112MODULE_PARM_DESC(max_channel, "Largest channel value [Default=3]");
113module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
114MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
115module_param_named(max_requests, max_requests, int, S_IRUGO);
116MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
117module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR);
118MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]");
119module_param_named(client_reserve, client_reserve, int, S_IRUGO );
120MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release");
121
122static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
123 struct ibmvscsi_host_data *hostdata);
124
125
126
127
128
129
130
131
132
133
134
135
136static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance)
137{
138 struct ibmvscsi_host_data *hostdata =
139 (struct ibmvscsi_host_data *)dev_instance;
140 vio_disable_interrupts(to_vio_dev(hostdata->dev));
141 tasklet_schedule(&hostdata->srp_task);
142 return IRQ_HANDLED;
143}
144
145
146
147
148
149
150
151
152
153static void ibmvscsi_release_crq_queue(struct crq_queue *queue,
154 struct ibmvscsi_host_data *hostdata,
155 int max_requests)
156{
157 long rc = 0;
158 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
159 free_irq(vdev->irq, (void *)hostdata);
160 tasklet_kill(&hostdata->srp_task);
161 do {
162 if (rc)
163 msleep(100);
164 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
165 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
166 dma_unmap_single(hostdata->dev,
167 queue->msg_token,
168 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
169 free_page((unsigned long)queue->msgs);
170}
171
172
173
174
175
176
177
178
179static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue)
180{
181 struct viosrp_crq *crq;
182 unsigned long flags;
183
184 spin_lock_irqsave(&queue->lock, flags);
185 crq = &queue->msgs[queue->cur];
186 if (crq->valid != VIOSRP_CRQ_FREE) {
187 if (++queue->cur == queue->size)
188 queue->cur = 0;
189
190
191
192
193 rmb();
194 } else
195 crq = NULL;
196 spin_unlock_irqrestore(&queue->lock, flags);
197
198 return crq;
199}
200
201
202
203
204
205
206
207static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
208 u64 word1, u64 word2)
209{
210 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
211
212
213
214
215
216 mb();
217 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
218}
219
220
221
222
223
224static void ibmvscsi_task(void *data)
225{
226 struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data;
227 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
228 struct viosrp_crq *crq;
229 int done = 0;
230
231 while (!done) {
232
233 while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
234 ibmvscsi_handle_crq(crq, hostdata);
235 crq->valid = VIOSRP_CRQ_FREE;
236 wmb();
237 }
238
239 vio_enable_interrupts(vdev);
240 crq = crq_queue_next_crq(&hostdata->queue);
241 if (crq != NULL) {
242 vio_disable_interrupts(vdev);
243 ibmvscsi_handle_crq(crq, hostdata);
244 crq->valid = VIOSRP_CRQ_FREE;
245 wmb();
246 } else {
247 done = 1;
248 }
249 }
250}
251
252static void gather_partition_info(void)
253{
254 const char *ppartition_name;
255 const __be32 *p_number_ptr;
256
257
258 if (!of_root)
259 return;
260
261 of_node_get(of_root);
262
263 ppartition_name = of_get_property(of_root, "ibm,partition-name", NULL);
264 if (ppartition_name)
265 strncpy(partition_name, ppartition_name,
266 sizeof(partition_name));
267 p_number_ptr = of_get_property(of_root, "ibm,partition-no", NULL);
268 if (p_number_ptr)
269 partition_number = of_read_number(p_number_ptr, 1);
270 of_node_put(of_root);
271}
272
273static void set_adapter_info(struct ibmvscsi_host_data *hostdata)
274{
275 memset(&hostdata->madapter_info, 0x00,
276 sizeof(hostdata->madapter_info));
277
278 dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION);
279 strcpy(hostdata->madapter_info.srp_version, SRP_VERSION);
280
281 strncpy(hostdata->madapter_info.partition_name, partition_name,
282 sizeof(hostdata->madapter_info.partition_name));
283
284 hostdata->madapter_info.partition_number =
285 cpu_to_be32(partition_number);
286
287 hostdata->madapter_info.mad_version = cpu_to_be32(SRP_MAD_VERSION_1);
288 hostdata->madapter_info.os_type = cpu_to_be32(SRP_MAD_OS_LINUX);
289}
290
291
292
293
294
295
296
297static int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
298 struct ibmvscsi_host_data *hostdata)
299{
300 int rc = 0;
301 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
302
303
304 do {
305 if (rc)
306 msleep(100);
307 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
308 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
309
310
311 memset(queue->msgs, 0x00, PAGE_SIZE);
312 queue->cur = 0;
313
314 set_adapter_info(hostdata);
315
316
317 rc = plpar_hcall_norets(H_REG_CRQ,
318 vdev->unit_address,
319 queue->msg_token, PAGE_SIZE);
320 if (rc == H_CLOSED) {
321
322 dev_warn(hostdata->dev, "Partner adapter not ready\n");
323 } else if (rc != 0) {
324 dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc);
325 }
326 return rc;
327}
328
329
330
331
332
333
334
335
336
337
338static int ibmvscsi_init_crq_queue(struct crq_queue *queue,
339 struct ibmvscsi_host_data *hostdata,
340 int max_requests)
341{
342 int rc;
343 int retrc;
344 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
345
346 queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
347
348 if (!queue->msgs)
349 goto malloc_failed;
350 queue->size = PAGE_SIZE / sizeof(*queue->msgs);
351
352 queue->msg_token = dma_map_single(hostdata->dev, queue->msgs,
353 queue->size * sizeof(*queue->msgs),
354 DMA_BIDIRECTIONAL);
355
356 if (dma_mapping_error(hostdata->dev, queue->msg_token))
357 goto map_failed;
358
359 gather_partition_info();
360 set_adapter_info(hostdata);
361
362 retrc = rc = plpar_hcall_norets(H_REG_CRQ,
363 vdev->unit_address,
364 queue->msg_token, PAGE_SIZE);
365 if (rc == H_RESOURCE)
366
367 rc = ibmvscsi_reset_crq_queue(queue,
368 hostdata);
369
370 if (rc == H_CLOSED) {
371
372 dev_warn(hostdata->dev, "Partner adapter not ready\n");
373 retrc = 0;
374 } else if (rc != 0) {
375 dev_warn(hostdata->dev, "Error %d opening adapter\n", rc);
376 goto reg_crq_failed;
377 }
378
379 queue->cur = 0;
380 spin_lock_init(&queue->lock);
381
382 tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task,
383 (unsigned long)hostdata);
384
385 if (request_irq(vdev->irq,
386 ibmvscsi_handle_event,
387 0, "ibmvscsi", (void *)hostdata) != 0) {
388 dev_err(hostdata->dev, "couldn't register irq 0x%x\n",
389 vdev->irq);
390 goto req_irq_failed;
391 }
392
393 rc = vio_enable_interrupts(vdev);
394 if (rc != 0) {
395 dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc);
396 goto req_irq_failed;
397 }
398
399 return retrc;
400
401 req_irq_failed:
402 tasklet_kill(&hostdata->srp_task);
403 rc = 0;
404 do {
405 if (rc)
406 msleep(100);
407 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
408 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
409 reg_crq_failed:
410 dma_unmap_single(hostdata->dev,
411 queue->msg_token,
412 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
413 map_failed:
414 free_page((unsigned long)queue->msgs);
415 malloc_failed:
416 return -1;
417}
418
419
420
421
422
423
424
425static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
426 struct ibmvscsi_host_data *hostdata)
427{
428 int rc = 0;
429 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
430
431
432 do {
433 if (rc)
434 msleep(100);
435 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
436 } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
437
438 if (rc)
439 dev_err(hostdata->dev, "Error %d enabling adapter\n", rc);
440 return rc;
441}
442
443
444
445
446
447
448
449
450
451
452
453
454static int initialize_event_pool(struct event_pool *pool,
455 int size, struct ibmvscsi_host_data *hostdata)
456{
457 int i;
458
459 pool->size = size;
460 pool->next = 0;
461 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
462 if (!pool->events)
463 return -ENOMEM;
464
465 pool->iu_storage =
466 dma_alloc_coherent(hostdata->dev,
467 pool->size * sizeof(*pool->iu_storage),
468 &pool->iu_token, 0);
469 if (!pool->iu_storage) {
470 kfree(pool->events);
471 return -ENOMEM;
472 }
473
474 for (i = 0; i < pool->size; ++i) {
475 struct srp_event_struct *evt = &pool->events[i];
476 memset(&evt->crq, 0x00, sizeof(evt->crq));
477 atomic_set(&evt->free, 1);
478 evt->crq.valid = VIOSRP_CRQ_CMD_RSP;
479 evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu));
480 evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token +
481 sizeof(*evt->xfer_iu) * i);
482 evt->xfer_iu = pool->iu_storage + i;
483 evt->hostdata = hostdata;
484 evt->ext_list = NULL;
485 evt->ext_list_token = 0;
486 }
487
488 return 0;
489}
490
491
492
493
494
495
496
497
498static void release_event_pool(struct event_pool *pool,
499 struct ibmvscsi_host_data *hostdata)
500{
501 int i, in_use = 0;
502 for (i = 0; i < pool->size; ++i) {
503 if (atomic_read(&pool->events[i].free) != 1)
504 ++in_use;
505 if (pool->events[i].ext_list) {
506 dma_free_coherent(hostdata->dev,
507 SG_ALL * sizeof(struct srp_direct_buf),
508 pool->events[i].ext_list,
509 pool->events[i].ext_list_token);
510 }
511 }
512 if (in_use)
513 dev_warn(hostdata->dev, "releasing event pool with %d "
514 "events still in use?\n", in_use);
515 kfree(pool->events);
516 dma_free_coherent(hostdata->dev,
517 pool->size * sizeof(*pool->iu_storage),
518 pool->iu_storage, pool->iu_token);
519}
520
521
522
523
524
525
526
527
528static int valid_event_struct(struct event_pool *pool,
529 struct srp_event_struct *evt)
530{
531 int index = evt - pool->events;
532 if (index < 0 || index >= pool->size)
533 return 0;
534 if (evt != pool->events + index)
535 return 0;
536 return 1;
537}
538
539
540
541
542
543
544
545static void free_event_struct(struct event_pool *pool,
546 struct srp_event_struct *evt)
547{
548 if (!valid_event_struct(pool, evt)) {
549 dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p "
550 "(not in pool %p)\n", evt, pool->events);
551 return;
552 }
553 if (atomic_inc_return(&evt->free) != 1) {
554 dev_err(evt->hostdata->dev, "Freeing event_struct %p "
555 "which is not in use!\n", evt);
556 return;
557 }
558}
559
560
561
562
563
564
565
566
567
568static struct srp_event_struct *get_event_struct(struct event_pool *pool)
569{
570 int i;
571 int poolsize = pool->size;
572 int offset = pool->next;
573
574 for (i = 0; i < poolsize; i++) {
575 offset = (offset + 1) % poolsize;
576 if (!atomic_dec_if_positive(&pool->events[offset].free)) {
577 pool->next = offset;
578 return &pool->events[offset];
579 }
580 }
581
582 printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
583 return NULL;
584}
585
586
587
588
589
590
591
592
593
594static void init_event_struct(struct srp_event_struct *evt_struct,
595 void (*done) (struct srp_event_struct *),
596 u8 format,
597 int timeout)
598{
599 evt_struct->cmnd = NULL;
600 evt_struct->cmnd_done = NULL;
601 evt_struct->sync_srp = NULL;
602 evt_struct->crq.format = format;
603 evt_struct->crq.timeout = cpu_to_be16(timeout);
604 evt_struct->done = done;
605}
606
607
608
609
610
611
612
613
614
615
616static void set_srp_direction(struct scsi_cmnd *cmd,
617 struct srp_cmd *srp_cmd,
618 int numbuf)
619{
620 u8 fmt;
621
622 if (numbuf == 0)
623 return;
624
625 if (numbuf == 1)
626 fmt = SRP_DATA_DESC_DIRECT;
627 else {
628 fmt = SRP_DATA_DESC_INDIRECT;
629 numbuf = min(numbuf, MAX_INDIRECT_BUFS);
630
631 if (cmd->sc_data_direction == DMA_TO_DEVICE)
632 srp_cmd->data_out_desc_cnt = numbuf;
633 else
634 srp_cmd->data_in_desc_cnt = numbuf;
635 }
636
637 if (cmd->sc_data_direction == DMA_TO_DEVICE)
638 srp_cmd->buf_fmt = fmt << 4;
639 else
640 srp_cmd->buf_fmt = fmt;
641}
642
643
644
645
646
647
648
649static void unmap_cmd_data(struct srp_cmd *cmd,
650 struct srp_event_struct *evt_struct,
651 struct device *dev)
652{
653 u8 out_fmt, in_fmt;
654
655 out_fmt = cmd->buf_fmt >> 4;
656 in_fmt = cmd->buf_fmt & ((1U << 4) - 1);
657
658 if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)
659 return;
660
661 if (evt_struct->cmnd)
662 scsi_dma_unmap(evt_struct->cmnd);
663}
664
665static int map_sg_list(struct scsi_cmnd *cmd, int nseg,
666 struct srp_direct_buf *md)
667{
668 int i;
669 struct scatterlist *sg;
670 u64 total_length = 0;
671
672 scsi_for_each_sg(cmd, sg, nseg, i) {
673 struct srp_direct_buf *descr = md + i;
674 descr->va = cpu_to_be64(sg_dma_address(sg));
675 descr->len = cpu_to_be32(sg_dma_len(sg));
676 descr->key = 0;
677 total_length += sg_dma_len(sg);
678 }
679 return total_length;
680}
681
682
683
684
685
686
687
688
689
690
691static int map_sg_data(struct scsi_cmnd *cmd,
692 struct srp_event_struct *evt_struct,
693 struct srp_cmd *srp_cmd, struct device *dev)
694{
695
696 int sg_mapped;
697 u64 total_length = 0;
698 struct srp_direct_buf *data =
699 (struct srp_direct_buf *) srp_cmd->add_data;
700 struct srp_indirect_buf *indirect =
701 (struct srp_indirect_buf *) data;
702
703 sg_mapped = scsi_dma_map(cmd);
704 if (!sg_mapped)
705 return 1;
706 else if (sg_mapped < 0)
707 return 0;
708
709 set_srp_direction(cmd, srp_cmd, sg_mapped);
710
711
712 if (sg_mapped == 1) {
713 map_sg_list(cmd, sg_mapped, data);
714 return 1;
715 }
716
717 indirect->table_desc.va = 0;
718 indirect->table_desc.len = cpu_to_be32(sg_mapped *
719 sizeof(struct srp_direct_buf));
720 indirect->table_desc.key = 0;
721
722 if (sg_mapped <= MAX_INDIRECT_BUFS) {
723 total_length = map_sg_list(cmd, sg_mapped,
724 &indirect->desc_list[0]);
725 indirect->len = cpu_to_be32(total_length);
726 return 1;
727 }
728
729
730 if (!evt_struct->ext_list) {
731 evt_struct->ext_list = (struct srp_direct_buf *)
732 dma_alloc_coherent(dev,
733 SG_ALL * sizeof(struct srp_direct_buf),
734 &evt_struct->ext_list_token, 0);
735 if (!evt_struct->ext_list) {
736 if (!firmware_has_feature(FW_FEATURE_CMO))
737 sdev_printk(KERN_ERR, cmd->device,
738 "Can't allocate memory "
739 "for indirect table\n");
740 scsi_dma_unmap(cmd);
741 return 0;
742 }
743 }
744
745 total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list);
746
747 indirect->len = cpu_to_be32(total_length);
748 indirect->table_desc.va = cpu_to_be64(evt_struct->ext_list_token);
749 indirect->table_desc.len = cpu_to_be32(sg_mapped *
750 sizeof(indirect->desc_list[0]));
751 memcpy(indirect->desc_list, evt_struct->ext_list,
752 MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
753 return 1;
754}
755
756
757
758
759
760
761
762
763
764
765static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
766 struct srp_event_struct *evt_struct,
767 struct srp_cmd *srp_cmd, struct device *dev)
768{
769 switch (cmd->sc_data_direction) {
770 case DMA_FROM_DEVICE:
771 case DMA_TO_DEVICE:
772 break;
773 case DMA_NONE:
774 return 1;
775 case DMA_BIDIRECTIONAL:
776 sdev_printk(KERN_ERR, cmd->device,
777 "Can't map DMA_BIDIRECTIONAL to read/write\n");
778 return 0;
779 default:
780 sdev_printk(KERN_ERR, cmd->device,
781 "Unknown data direction 0x%02x; can't map!\n",
782 cmd->sc_data_direction);
783 return 0;
784 }
785
786 return map_sg_data(cmd, evt_struct, srp_cmd, dev);
787}
788
789
790
791
792
793static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
794{
795 struct srp_event_struct *evt;
796 unsigned long flags;
797
798 spin_lock_irqsave(hostdata->host->host_lock, flags);
799 while (!list_empty(&hostdata->sent)) {
800 evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list);
801 list_del(&evt->list);
802 del_timer(&evt->timer);
803
804 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
805 if (evt->cmnd) {
806 evt->cmnd->result = (error_code << 16);
807 unmap_cmd_data(&evt->iu.srp.cmd, evt,
808 evt->hostdata->dev);
809 if (evt->cmnd_done)
810 evt->cmnd_done(evt->cmnd);
811 } else if (evt->done && evt->crq.format != VIOSRP_MAD_FORMAT &&
812 evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
813 evt->done(evt);
814 free_event_struct(&evt->hostdata->pool, evt);
815 spin_lock_irqsave(hostdata->host->host_lock, flags);
816 }
817 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
818}
819
820
821
822
823
824static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
825{
826 scsi_block_requests(hostdata->host);
827 atomic_set(&hostdata->request_limit, 0);
828
829 purge_requests(hostdata, DID_ERROR);
830 hostdata->reset_crq = 1;
831 wake_up(&hostdata->work_wait_q);
832}
833
834
835
836
837
838
839
840static void ibmvscsi_timeout(struct timer_list *t)
841{
842 struct srp_event_struct *evt_struct = from_timer(evt_struct, t, timer);
843 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
844
845 dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
846 evt_struct->iu.srp.cmd.opcode);
847
848 ibmvscsi_reset_host(hostdata);
849}
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
865 struct ibmvscsi_host_data *hostdata,
866 unsigned long timeout)
867{
868 __be64 *crq_as_u64 = (__be64 *)&evt_struct->crq;
869 int request_status = 0;
870 int rc;
871 int srp_req = 0;
872
873
874
875
876
877
878
879 if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
880 srp_req = 1;
881 request_status =
882 atomic_dec_if_positive(&hostdata->request_limit);
883
884
885
886 if (request_status < -1)
887 goto send_error;
888
889
890
891
892
893 else if (request_status == -1 &&
894 evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
895 goto send_busy;
896
897
898
899
900 else if (request_status < 2 &&
901 evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
902
903
904
905
906
907
908
909 int server_limit = request_status;
910 struct srp_event_struct *tmp_evt;
911
912 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
913 server_limit++;
914 }
915
916 if (server_limit > 2)
917 goto send_busy;
918 }
919 }
920
921
922 *evt_struct->xfer_iu = evt_struct->iu;
923 evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
924
925
926
927
928
929 list_add_tail(&evt_struct->list, &hostdata->sent);
930
931 timer_setup(&evt_struct->timer, ibmvscsi_timeout, 0);
932 if (timeout) {
933 evt_struct->timer.expires = jiffies + (timeout * HZ);
934 add_timer(&evt_struct->timer);
935 }
936
937 rc = ibmvscsi_send_crq(hostdata, be64_to_cpu(crq_as_u64[0]),
938 be64_to_cpu(crq_as_u64[1]));
939 if (rc != 0) {
940 list_del(&evt_struct->list);
941 del_timer(&evt_struct->timer);
942
943
944
945
946
947
948 if (rc == H_CLOSED) {
949 dev_warn(hostdata->dev, "send warning. "
950 "Receive queue closed, will retry.\n");
951 goto send_busy;
952 }
953 dev_err(hostdata->dev, "send error %d\n", rc);
954 if (srp_req)
955 atomic_inc(&hostdata->request_limit);
956 goto send_error;
957 }
958
959 return 0;
960
961 send_busy:
962 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
963
964 free_event_struct(&hostdata->pool, evt_struct);
965 if (srp_req && request_status != -1)
966 atomic_inc(&hostdata->request_limit);
967 return SCSI_MLQUEUE_HOST_BUSY;
968
969 send_error:
970 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
971
972 if (evt_struct->cmnd != NULL) {
973 evt_struct->cmnd->result = DID_ERROR << 16;
974 evt_struct->cmnd_done(evt_struct->cmnd);
975 } else if (evt_struct->done)
976 evt_struct->done(evt_struct);
977
978 free_event_struct(&hostdata->pool, evt_struct);
979 return 0;
980}
981
982
983
984
985
986
987
988
989static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
990{
991 struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
992 struct scsi_cmnd *cmnd = evt_struct->cmnd;
993
994 if (unlikely(rsp->opcode != SRP_RSP)) {
995 if (printk_ratelimit())
996 dev_warn(evt_struct->hostdata->dev,
997 "bad SRP RSP type %#02x\n", rsp->opcode);
998 }
999
1000 if (cmnd) {
1001 cmnd->result |= rsp->status;
1002 if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
1003 memcpy(cmnd->sense_buffer,
1004 rsp->data,
1005 be32_to_cpu(rsp->sense_data_len));
1006 unmap_cmd_data(&evt_struct->iu.srp.cmd,
1007 evt_struct,
1008 evt_struct->hostdata->dev);
1009
1010 if (rsp->flags & SRP_RSP_FLAG_DOOVER)
1011 scsi_set_resid(cmnd,
1012 be32_to_cpu(rsp->data_out_res_cnt));
1013 else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
1014 scsi_set_resid(cmnd, be32_to_cpu(rsp->data_in_res_cnt));
1015 }
1016
1017 if (evt_struct->cmnd_done)
1018 evt_struct->cmnd_done(cmnd);
1019}
1020
1021
1022
1023
1024
1025
1026static inline u16 lun_from_dev(struct scsi_device *dev)
1027{
1028 return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
1029}
1030
1031
1032
1033
1034
1035
1036static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd,
1037 void (*done) (struct scsi_cmnd *))
1038{
1039 struct srp_cmd *srp_cmd;
1040 struct srp_event_struct *evt_struct;
1041 struct srp_indirect_buf *indirect;
1042 struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host);
1043 u16 lun = lun_from_dev(cmnd->device);
1044 u8 out_fmt, in_fmt;
1045
1046 cmnd->result = (DID_OK << 16);
1047 evt_struct = get_event_struct(&hostdata->pool);
1048 if (!evt_struct)
1049 return SCSI_MLQUEUE_HOST_BUSY;
1050
1051
1052 srp_cmd = &evt_struct->iu.srp.cmd;
1053 memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
1054 srp_cmd->opcode = SRP_CMD;
1055 memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb));
1056 int_to_scsilun(lun, &srp_cmd->lun);
1057
1058 if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
1059 if (!firmware_has_feature(FW_FEATURE_CMO))
1060 sdev_printk(KERN_ERR, cmnd->device,
1061 "couldn't convert cmd to srp_cmd\n");
1062 free_event_struct(&hostdata->pool, evt_struct);
1063 return SCSI_MLQUEUE_HOST_BUSY;
1064 }
1065
1066 init_event_struct(evt_struct,
1067 handle_cmd_rsp,
1068 VIOSRP_SRP_FORMAT,
1069 cmnd->request->timeout/HZ);
1070
1071 evt_struct->cmnd = cmnd;
1072 evt_struct->cmnd_done = done;
1073
1074
1075 indirect = (struct srp_indirect_buf *) srp_cmd->add_data;
1076 out_fmt = srp_cmd->buf_fmt >> 4;
1077 in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);
1078 if ((in_fmt == SRP_DATA_DESC_INDIRECT ||
1079 out_fmt == SRP_DATA_DESC_INDIRECT) &&
1080 indirect->table_desc.va == 0) {
1081 indirect->table_desc.va =
1082 cpu_to_be64(be64_to_cpu(evt_struct->crq.IU_data_ptr) +
1083 offsetof(struct srp_cmd, add_data) +
1084 offsetof(struct srp_indirect_buf, desc_list));
1085 }
1086
1087 return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
1088}
1089
1090static DEF_SCSI_QCMD(ibmvscsi_queuecommand)
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103static int map_persist_bufs(struct ibmvscsi_host_data *hostdata)
1104{
1105
1106 hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps,
1107 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1108
1109 if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) {
1110 dev_err(hostdata->dev, "Unable to map capabilities buffer!\n");
1111 return 1;
1112 }
1113
1114 hostdata->adapter_info_addr = dma_map_single(hostdata->dev,
1115 &hostdata->madapter_info,
1116 sizeof(hostdata->madapter_info),
1117 DMA_BIDIRECTIONAL);
1118 if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) {
1119 dev_err(hostdata->dev, "Unable to map adapter info buffer!\n");
1120 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
1121 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1122 return 1;
1123 }
1124
1125 return 0;
1126}
1127
1128
1129
1130
1131
1132
1133
1134static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata)
1135{
1136 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
1137 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1138
1139 dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr,
1140 sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL);
1141}
1142
1143
1144
1145
1146
1147
1148
1149
1150static void login_rsp(struct srp_event_struct *evt_struct)
1151{
1152 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1153 switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
1154 case SRP_LOGIN_RSP:
1155 break;
1156 case SRP_LOGIN_REJ:
1157 dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
1158 evt_struct->xfer_iu->srp.login_rej.reason);
1159
1160 atomic_set(&hostdata->request_limit, -1);
1161 return;
1162 default:
1163 dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",
1164 evt_struct->xfer_iu->srp.login_rsp.opcode);
1165
1166 atomic_set(&hostdata->request_limit, -1);
1167 return;
1168 }
1169
1170 dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
1171 hostdata->client_migrated = 0;
1172
1173
1174
1175
1176
1177 atomic_set(&hostdata->request_limit,
1178 be32_to_cpu(evt_struct->xfer_iu->srp.login_rsp.req_lim_delta));
1179
1180
1181 scsi_unblock_requests(hostdata->host);
1182}
1183
1184
1185
1186
1187
1188
1189
1190static int send_srp_login(struct ibmvscsi_host_data *hostdata)
1191{
1192 int rc;
1193 unsigned long flags;
1194 struct srp_login_req *login;
1195 struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
1196
1197 BUG_ON(!evt_struct);
1198 init_event_struct(evt_struct, login_rsp,
1199 VIOSRP_SRP_FORMAT, login_timeout);
1200
1201 login = &evt_struct->iu.srp.login_req;
1202 memset(login, 0, sizeof(*login));
1203 login->opcode = SRP_LOGIN_REQ;
1204 login->req_it_iu_len = cpu_to_be32(sizeof(union srp_iu));
1205 login->req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
1206 SRP_BUF_FORMAT_INDIRECT);
1207
1208 spin_lock_irqsave(hostdata->host->host_lock, flags);
1209
1210
1211
1212
1213 atomic_set(&hostdata->request_limit, 0);
1214
1215 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2);
1216 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1217 dev_info(hostdata->dev, "sent SRP login\n");
1218 return rc;
1219};
1220
1221
1222
1223
1224
1225
1226
1227static void capabilities_rsp(struct srp_event_struct *evt_struct)
1228{
1229 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1230
1231 if (evt_struct->xfer_iu->mad.capabilities.common.status) {
1232 dev_err(hostdata->dev, "error 0x%X getting capabilities info\n",
1233 evt_struct->xfer_iu->mad.capabilities.common.status);
1234 } else {
1235 if (hostdata->caps.migration.common.server_support !=
1236 cpu_to_be16(SERVER_SUPPORTS_CAP))
1237 dev_info(hostdata->dev, "Partition migration not supported\n");
1238
1239 if (client_reserve) {
1240 if (hostdata->caps.reserve.common.server_support ==
1241 cpu_to_be16(SERVER_SUPPORTS_CAP))
1242 dev_info(hostdata->dev, "Client reserve enabled\n");
1243 else
1244 dev_info(hostdata->dev, "Client reserve not supported\n");
1245 }
1246 }
1247
1248 send_srp_login(hostdata);
1249}
1250
1251
1252
1253
1254
1255
1256static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata)
1257{
1258 struct viosrp_capabilities *req;
1259 struct srp_event_struct *evt_struct;
1260 unsigned long flags;
1261 struct device_node *of_node = hostdata->dev->of_node;
1262 const char *location;
1263
1264 evt_struct = get_event_struct(&hostdata->pool);
1265 BUG_ON(!evt_struct);
1266
1267 init_event_struct(evt_struct, capabilities_rsp,
1268 VIOSRP_MAD_FORMAT, info_timeout);
1269
1270 req = &evt_struct->iu.mad.capabilities;
1271 memset(req, 0, sizeof(*req));
1272
1273 hostdata->caps.flags = cpu_to_be32(CAP_LIST_SUPPORTED);
1274 if (hostdata->client_migrated)
1275 hostdata->caps.flags |= cpu_to_be32(CLIENT_MIGRATED);
1276
1277 strncpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev),
1278 sizeof(hostdata->caps.name));
1279 hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0';
1280
1281 location = of_get_property(of_node, "ibm,loc-code", NULL);
1282 location = location ? location : dev_name(hostdata->dev);
1283 strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc));
1284 hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0';
1285
1286 req->common.type = cpu_to_be32(VIOSRP_CAPABILITIES_TYPE);
1287 req->buffer = cpu_to_be64(hostdata->caps_addr);
1288
1289 hostdata->caps.migration.common.cap_type =
1290 cpu_to_be32(MIGRATION_CAPABILITIES);
1291 hostdata->caps.migration.common.length =
1292 cpu_to_be16(sizeof(hostdata->caps.migration));
1293 hostdata->caps.migration.common.server_support =
1294 cpu_to_be16(SERVER_SUPPORTS_CAP);
1295 hostdata->caps.migration.ecl = cpu_to_be32(1);
1296
1297 if (client_reserve) {
1298 hostdata->caps.reserve.common.cap_type =
1299 cpu_to_be32(RESERVATION_CAPABILITIES);
1300 hostdata->caps.reserve.common.length =
1301 cpu_to_be16(sizeof(hostdata->caps.reserve));
1302 hostdata->caps.reserve.common.server_support =
1303 cpu_to_be16(SERVER_SUPPORTS_CAP);
1304 hostdata->caps.reserve.type =
1305 cpu_to_be32(CLIENT_RESERVE_SCSI_2);
1306 req->common.length =
1307 cpu_to_be16(sizeof(hostdata->caps));
1308 } else
1309 req->common.length = cpu_to_be16(sizeof(hostdata->caps) -
1310 sizeof(hostdata->caps.reserve));
1311
1312 spin_lock_irqsave(hostdata->host->host_lock, flags);
1313 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1314 dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n");
1315 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1316};
1317
1318
1319
1320
1321
1322
1323
1324
1325static void fast_fail_rsp(struct srp_event_struct *evt_struct)
1326{
1327 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1328 u16 status = be16_to_cpu(evt_struct->xfer_iu->mad.fast_fail.common.status);
1329
1330 if (status == VIOSRP_MAD_NOT_SUPPORTED)
1331 dev_err(hostdata->dev, "fast_fail not supported in server\n");
1332 else if (status == VIOSRP_MAD_FAILED)
1333 dev_err(hostdata->dev, "fast_fail request failed\n");
1334 else if (status != VIOSRP_MAD_SUCCESS)
1335 dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);
1336
1337 send_mad_capabilities(hostdata);
1338}
1339
1340
1341
1342
1343
1344
1345
1346static int enable_fast_fail(struct ibmvscsi_host_data *hostdata)
1347{
1348 int rc;
1349 unsigned long flags;
1350 struct viosrp_fast_fail *fast_fail_mad;
1351 struct srp_event_struct *evt_struct;
1352
1353 if (!fast_fail) {
1354 send_mad_capabilities(hostdata);
1355 return 0;
1356 }
1357
1358 evt_struct = get_event_struct(&hostdata->pool);
1359 BUG_ON(!evt_struct);
1360
1361 init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout);
1362
1363 fast_fail_mad = &evt_struct->iu.mad.fast_fail;
1364 memset(fast_fail_mad, 0, sizeof(*fast_fail_mad));
1365 fast_fail_mad->common.type = cpu_to_be32(VIOSRP_ENABLE_FAST_FAIL);
1366 fast_fail_mad->common.length = cpu_to_be16(sizeof(*fast_fail_mad));
1367
1368 spin_lock_irqsave(hostdata->host->host_lock, flags);
1369 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
1370 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1371 return rc;
1372}
1373
1374
1375
1376
1377
1378
1379
1380
1381static void adapter_info_rsp(struct srp_event_struct *evt_struct)
1382{
1383 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1384
1385 if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
1386 dev_err(hostdata->dev, "error %d getting adapter info\n",
1387 evt_struct->xfer_iu->mad.adapter_info.common.status);
1388 } else {
1389 dev_info(hostdata->dev, "host srp version: %s, "
1390 "host partition %s (%d), OS %d, max io %u\n",
1391 hostdata->madapter_info.srp_version,
1392 hostdata->madapter_info.partition_name,
1393 be32_to_cpu(hostdata->madapter_info.partition_number),
1394 be32_to_cpu(hostdata->madapter_info.os_type),
1395 be32_to_cpu(hostdata->madapter_info.port_max_txu[0]));
1396
1397 if (hostdata->madapter_info.port_max_txu[0])
1398 hostdata->host->max_sectors =
1399 be32_to_cpu(hostdata->madapter_info.port_max_txu[0]) >> 9;
1400
1401 if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX &&
1402 strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
1403 dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
1404 hostdata->madapter_info.srp_version);
1405 dev_err(hostdata->dev, "limiting scatterlists to %d\n",
1406 MAX_INDIRECT_BUFS);
1407 hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
1408 }
1409
1410 if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX) {
1411 enable_fast_fail(hostdata);
1412 return;
1413 }
1414 }
1415
1416 send_srp_login(hostdata);
1417}
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
1429{
1430 struct viosrp_adapter_info *req;
1431 struct srp_event_struct *evt_struct;
1432 unsigned long flags;
1433
1434 evt_struct = get_event_struct(&hostdata->pool);
1435 BUG_ON(!evt_struct);
1436
1437 init_event_struct(evt_struct,
1438 adapter_info_rsp,
1439 VIOSRP_MAD_FORMAT,
1440 info_timeout);
1441
1442 req = &evt_struct->iu.mad.adapter_info;
1443 memset(req, 0x00, sizeof(*req));
1444
1445 req->common.type = cpu_to_be32(VIOSRP_ADAPTER_INFO_TYPE);
1446 req->common.length = cpu_to_be16(sizeof(hostdata->madapter_info));
1447 req->buffer = cpu_to_be64(hostdata->adapter_info_addr);
1448
1449 spin_lock_irqsave(hostdata->host->host_lock, flags);
1450 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1451 dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
1452 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1453};
1454
1455
1456
1457
1458
1459static void init_adapter(struct ibmvscsi_host_data *hostdata)
1460{
1461 send_mad_adapter_info(hostdata);
1462}
1463
1464
1465
1466
1467
1468
1469
1470static void sync_completion(struct srp_event_struct *evt_struct)
1471{
1472
1473 if (evt_struct->sync_srp)
1474 *evt_struct->sync_srp = *evt_struct->xfer_iu;
1475
1476 complete(&evt_struct->comp);
1477}
1478
1479
1480
1481
1482
1483static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
1484{
1485 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1486 struct srp_tsk_mgmt *tsk_mgmt;
1487 struct srp_event_struct *evt;
1488 struct srp_event_struct *tmp_evt, *found_evt;
1489 union viosrp_iu srp_rsp;
1490 int rsp_rc;
1491 unsigned long flags;
1492 u16 lun = lun_from_dev(cmd->device);
1493 unsigned long wait_switch = 0;
1494
1495
1496
1497
1498 spin_lock_irqsave(hostdata->host->host_lock, flags);
1499 wait_switch = jiffies + (init_timeout * HZ);
1500 do {
1501 found_evt = NULL;
1502 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1503 if (tmp_evt->cmnd == cmd) {
1504 found_evt = tmp_evt;
1505 break;
1506 }
1507 }
1508
1509 if (!found_evt) {
1510 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1511 return SUCCESS;
1512 }
1513
1514 evt = get_event_struct(&hostdata->pool);
1515 if (evt == NULL) {
1516 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1517 sdev_printk(KERN_ERR, cmd->device,
1518 "failed to allocate abort event\n");
1519 return FAILED;
1520 }
1521
1522 init_event_struct(evt,
1523 sync_completion,
1524 VIOSRP_SRP_FORMAT,
1525 abort_timeout);
1526
1527 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1528
1529
1530 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1531 tsk_mgmt->opcode = SRP_TSK_MGMT;
1532 int_to_scsilun(lun, &tsk_mgmt->lun);
1533 tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
1534 tsk_mgmt->task_tag = (u64) found_evt;
1535
1536 evt->sync_srp = &srp_rsp;
1537
1538 init_completion(&evt->comp);
1539 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2);
1540
1541 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1542 break;
1543
1544 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1545 msleep(10);
1546 spin_lock_irqsave(hostdata->host->host_lock, flags);
1547 } while (time_before(jiffies, wait_switch));
1548
1549 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1550
1551 if (rsp_rc != 0) {
1552 sdev_printk(KERN_ERR, cmd->device,
1553 "failed to send abort() event. rc=%d\n", rsp_rc);
1554 return FAILED;
1555 }
1556
1557 sdev_printk(KERN_INFO, cmd->device,
1558 "aborting command. lun 0x%llx, tag 0x%llx\n",
1559 (((u64) lun) << 48), (u64) found_evt);
1560
1561 wait_for_completion(&evt->comp);
1562
1563
1564 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1565 if (printk_ratelimit())
1566 sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
1567 srp_rsp.srp.rsp.opcode);
1568 return FAILED;
1569 }
1570
1571 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1572 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1573 else
1574 rsp_rc = srp_rsp.srp.rsp.status;
1575
1576 if (rsp_rc) {
1577 if (printk_ratelimit())
1578 sdev_printk(KERN_WARNING, cmd->device,
1579 "abort code %d for task tag 0x%llx\n",
1580 rsp_rc, tsk_mgmt->task_tag);
1581 return FAILED;
1582 }
1583
1584
1585
1586
1587
1588 spin_lock_irqsave(hostdata->host->host_lock, flags);
1589 found_evt = NULL;
1590 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1591 if (tmp_evt->cmnd == cmd) {
1592 found_evt = tmp_evt;
1593 break;
1594 }
1595 }
1596
1597 if (found_evt == NULL) {
1598 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1599 sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n",
1600 tsk_mgmt->task_tag);
1601 return SUCCESS;
1602 }
1603
1604 sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n",
1605 tsk_mgmt->task_tag);
1606
1607 cmd->result = (DID_ABORT << 16);
1608 list_del(&found_evt->list);
1609 unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
1610 found_evt->hostdata->dev);
1611 free_event_struct(&found_evt->hostdata->pool, found_evt);
1612 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1613 atomic_inc(&hostdata->request_limit);
1614 return SUCCESS;
1615}
1616
1617
1618
1619
1620
1621
1622static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
1623{
1624 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1625 struct srp_tsk_mgmt *tsk_mgmt;
1626 struct srp_event_struct *evt;
1627 struct srp_event_struct *tmp_evt, *pos;
1628 union viosrp_iu srp_rsp;
1629 int rsp_rc;
1630 unsigned long flags;
1631 u16 lun = lun_from_dev(cmd->device);
1632 unsigned long wait_switch = 0;
1633
1634 spin_lock_irqsave(hostdata->host->host_lock, flags);
1635 wait_switch = jiffies + (init_timeout * HZ);
1636 do {
1637 evt = get_event_struct(&hostdata->pool);
1638 if (evt == NULL) {
1639 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1640 sdev_printk(KERN_ERR, cmd->device,
1641 "failed to allocate reset event\n");
1642 return FAILED;
1643 }
1644
1645 init_event_struct(evt,
1646 sync_completion,
1647 VIOSRP_SRP_FORMAT,
1648 reset_timeout);
1649
1650 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1651
1652
1653 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1654 tsk_mgmt->opcode = SRP_TSK_MGMT;
1655 int_to_scsilun(lun, &tsk_mgmt->lun);
1656 tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
1657
1658 evt->sync_srp = &srp_rsp;
1659
1660 init_completion(&evt->comp);
1661 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2);
1662
1663 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1664 break;
1665
1666 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1667 msleep(10);
1668 spin_lock_irqsave(hostdata->host->host_lock, flags);
1669 } while (time_before(jiffies, wait_switch));
1670
1671 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1672
1673 if (rsp_rc != 0) {
1674 sdev_printk(KERN_ERR, cmd->device,
1675 "failed to send reset event. rc=%d\n", rsp_rc);
1676 return FAILED;
1677 }
1678
1679 sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n",
1680 (((u64) lun) << 48));
1681
1682 wait_for_completion(&evt->comp);
1683
1684
1685 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1686 if (printk_ratelimit())
1687 sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
1688 srp_rsp.srp.rsp.opcode);
1689 return FAILED;
1690 }
1691
1692 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1693 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1694 else
1695 rsp_rc = srp_rsp.srp.rsp.status;
1696
1697 if (rsp_rc) {
1698 if (printk_ratelimit())
1699 sdev_printk(KERN_WARNING, cmd->device,
1700 "reset code %d for task tag 0x%llx\n",
1701 rsp_rc, tsk_mgmt->task_tag);
1702 return FAILED;
1703 }
1704
1705
1706
1707
1708 spin_lock_irqsave(hostdata->host->host_lock, flags);
1709 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1710 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1711 if (tmp_evt->cmnd)
1712 tmp_evt->cmnd->result = (DID_RESET << 16);
1713 list_del(&tmp_evt->list);
1714 unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
1715 tmp_evt->hostdata->dev);
1716 free_event_struct(&tmp_evt->hostdata->pool,
1717 tmp_evt);
1718 atomic_inc(&hostdata->request_limit);
1719 if (tmp_evt->cmnd_done)
1720 tmp_evt->cmnd_done(tmp_evt->cmnd);
1721 else if (tmp_evt->done)
1722 tmp_evt->done(tmp_evt);
1723 }
1724 }
1725 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1726 return SUCCESS;
1727}
1728
1729
1730
1731
1732
1733static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
1734{
1735 unsigned long wait_switch = 0;
1736 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1737
1738 dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
1739
1740 ibmvscsi_reset_host(hostdata);
1741
1742 for (wait_switch = jiffies + (init_timeout * HZ);
1743 time_before(jiffies, wait_switch) &&
1744 atomic_read(&hostdata->request_limit) < 2;) {
1745
1746 msleep(10);
1747 }
1748
1749 if (atomic_read(&hostdata->request_limit) <= 0)
1750 return FAILED;
1751
1752 return SUCCESS;
1753}
1754
1755
1756
1757
1758
1759
1760
1761static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1762 struct ibmvscsi_host_data *hostdata)
1763{
1764 long rc;
1765 unsigned long flags;
1766
1767 struct srp_event_struct *evt_struct =
1768 (__force struct srp_event_struct *)crq->IU_data_ptr;
1769 switch (crq->valid) {
1770 case VIOSRP_CRQ_INIT_RSP:
1771 switch (crq->format) {
1772 case VIOSRP_CRQ_INIT:
1773 dev_info(hostdata->dev, "partner initialized\n");
1774
1775 rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0);
1776 if (rc == 0) {
1777
1778 init_adapter(hostdata);
1779 } else {
1780 dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
1781 }
1782
1783 break;
1784 case VIOSRP_CRQ_INIT_COMPLETE:
1785 dev_info(hostdata->dev, "partner initialization complete\n");
1786
1787
1788 init_adapter(hostdata);
1789 break;
1790 default:
1791 dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
1792 }
1793 return;
1794 case VIOSRP_CRQ_XPORT_EVENT:
1795 scsi_block_requests(hostdata->host);
1796 atomic_set(&hostdata->request_limit, 0);
1797 if (crq->format == 0x06) {
1798
1799 dev_info(hostdata->dev, "Re-enabling adapter!\n");
1800 hostdata->client_migrated = 1;
1801 hostdata->reenable_crq = 1;
1802 purge_requests(hostdata, DID_REQUEUE);
1803 wake_up(&hostdata->work_wait_q);
1804 } else {
1805 dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",
1806 crq->format);
1807 ibmvscsi_reset_host(hostdata);
1808 }
1809 return;
1810 case VIOSRP_CRQ_CMD_RSP:
1811 break;
1812 default:
1813 dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
1814 crq->valid);
1815 return;
1816 }
1817
1818
1819
1820
1821
1822 if (!valid_event_struct(&hostdata->pool, evt_struct)) {
1823 dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
1824 evt_struct);
1825 return;
1826 }
1827
1828 if (atomic_read(&evt_struct->free)) {
1829 dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
1830 evt_struct);
1831 return;
1832 }
1833
1834 if (crq->format == VIOSRP_SRP_FORMAT)
1835 atomic_add(be32_to_cpu(evt_struct->xfer_iu->srp.rsp.req_lim_delta),
1836 &hostdata->request_limit);
1837
1838 del_timer(&evt_struct->timer);
1839
1840 if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd)
1841 evt_struct->cmnd->result = DID_ERROR << 16;
1842 if (evt_struct->done)
1843 evt_struct->done(evt_struct);
1844 else
1845 dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
1846
1847
1848
1849
1850
1851 spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1852 list_del(&evt_struct->list);
1853 free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1854 spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1855}
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865static int ibmvscsi_slave_configure(struct scsi_device *sdev)
1866{
1867 struct Scsi_Host *shost = sdev->host;
1868 unsigned long lock_flags = 0;
1869
1870 spin_lock_irqsave(shost->host_lock, lock_flags);
1871 if (sdev->type == TYPE_DISK) {
1872 sdev->allow_restart = 1;
1873 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
1874 }
1875 spin_unlock_irqrestore(shost->host_lock, lock_flags);
1876 return 0;
1877}
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
1889{
1890 if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
1891 qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
1892 return scsi_change_queue_depth(sdev, qdepth);
1893}
1894
1895
1896
1897
1898static ssize_t show_host_vhost_loc(struct device *dev,
1899 struct device_attribute *attr, char *buf)
1900{
1901 struct Scsi_Host *shost = class_to_shost(dev);
1902 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1903 int len;
1904
1905 len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n",
1906 hostdata->caps.loc);
1907 return len;
1908}
1909
1910static struct device_attribute ibmvscsi_host_vhost_loc = {
1911 .attr = {
1912 .name = "vhost_loc",
1913 .mode = S_IRUGO,
1914 },
1915 .show = show_host_vhost_loc,
1916};
1917
1918static ssize_t show_host_vhost_name(struct device *dev,
1919 struct device_attribute *attr, char *buf)
1920{
1921 struct Scsi_Host *shost = class_to_shost(dev);
1922 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1923 int len;
1924
1925 len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n",
1926 hostdata->caps.name);
1927 return len;
1928}
1929
1930static struct device_attribute ibmvscsi_host_vhost_name = {
1931 .attr = {
1932 .name = "vhost_name",
1933 .mode = S_IRUGO,
1934 },
1935 .show = show_host_vhost_name,
1936};
1937
1938static ssize_t show_host_srp_version(struct device *dev,
1939 struct device_attribute *attr, char *buf)
1940{
1941 struct Scsi_Host *shost = class_to_shost(dev);
1942 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1943 int len;
1944
1945 len = snprintf(buf, PAGE_SIZE, "%s\n",
1946 hostdata->madapter_info.srp_version);
1947 return len;
1948}
1949
1950static struct device_attribute ibmvscsi_host_srp_version = {
1951 .attr = {
1952 .name = "srp_version",
1953 .mode = S_IRUGO,
1954 },
1955 .show = show_host_srp_version,
1956};
1957
1958static ssize_t show_host_partition_name(struct device *dev,
1959 struct device_attribute *attr,
1960 char *buf)
1961{
1962 struct Scsi_Host *shost = class_to_shost(dev);
1963 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1964 int len;
1965
1966 len = snprintf(buf, PAGE_SIZE, "%s\n",
1967 hostdata->madapter_info.partition_name);
1968 return len;
1969}
1970
1971static struct device_attribute ibmvscsi_host_partition_name = {
1972 .attr = {
1973 .name = "partition_name",
1974 .mode = S_IRUGO,
1975 },
1976 .show = show_host_partition_name,
1977};
1978
1979static ssize_t show_host_partition_number(struct device *dev,
1980 struct device_attribute *attr,
1981 char *buf)
1982{
1983 struct Scsi_Host *shost = class_to_shost(dev);
1984 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1985 int len;
1986
1987 len = snprintf(buf, PAGE_SIZE, "%d\n",
1988 be32_to_cpu(hostdata->madapter_info.partition_number));
1989 return len;
1990}
1991
1992static struct device_attribute ibmvscsi_host_partition_number = {
1993 .attr = {
1994 .name = "partition_number",
1995 .mode = S_IRUGO,
1996 },
1997 .show = show_host_partition_number,
1998};
1999
2000static ssize_t show_host_mad_version(struct device *dev,
2001 struct device_attribute *attr, char *buf)
2002{
2003 struct Scsi_Host *shost = class_to_shost(dev);
2004 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2005 int len;
2006
2007 len = snprintf(buf, PAGE_SIZE, "%d\n",
2008 be32_to_cpu(hostdata->madapter_info.mad_version));
2009 return len;
2010}
2011
2012static struct device_attribute ibmvscsi_host_mad_version = {
2013 .attr = {
2014 .name = "mad_version",
2015 .mode = S_IRUGO,
2016 },
2017 .show = show_host_mad_version,
2018};
2019
2020static ssize_t show_host_os_type(struct device *dev,
2021 struct device_attribute *attr, char *buf)
2022{
2023 struct Scsi_Host *shost = class_to_shost(dev);
2024 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2025 int len;
2026
2027 len = snprintf(buf, PAGE_SIZE, "%d\n",
2028 be32_to_cpu(hostdata->madapter_info.os_type));
2029 return len;
2030}
2031
2032static struct device_attribute ibmvscsi_host_os_type = {
2033 .attr = {
2034 .name = "os_type",
2035 .mode = S_IRUGO,
2036 },
2037 .show = show_host_os_type,
2038};
2039
2040static ssize_t show_host_config(struct device *dev,
2041 struct device_attribute *attr, char *buf)
2042{
2043 return 0;
2044}
2045
2046static struct device_attribute ibmvscsi_host_config = {
2047 .attr = {
2048 .name = "config",
2049 .mode = S_IRUGO,
2050 },
2051 .show = show_host_config,
2052};
2053
2054static struct device_attribute *ibmvscsi_attrs[] = {
2055 &ibmvscsi_host_vhost_loc,
2056 &ibmvscsi_host_vhost_name,
2057 &ibmvscsi_host_srp_version,
2058 &ibmvscsi_host_partition_name,
2059 &ibmvscsi_host_partition_number,
2060 &ibmvscsi_host_mad_version,
2061 &ibmvscsi_host_os_type,
2062 &ibmvscsi_host_config,
2063 NULL
2064};
2065
2066
2067
2068
2069static struct scsi_host_template driver_template = {
2070 .module = THIS_MODULE,
2071 .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
2072 .proc_name = "ibmvscsi",
2073 .queuecommand = ibmvscsi_queuecommand,
2074 .eh_timed_out = srp_timed_out,
2075 .eh_abort_handler = ibmvscsi_eh_abort_handler,
2076 .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
2077 .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
2078 .slave_configure = ibmvscsi_slave_configure,
2079 .change_queue_depth = ibmvscsi_change_queue_depth,
2080 .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT,
2081 .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
2082 .this_id = -1,
2083 .sg_tablesize = SG_ALL,
2084 .use_clustering = ENABLE_CLUSTERING,
2085 .shost_attrs = ibmvscsi_attrs,
2086};
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev)
2097{
2098
2099 unsigned long desired_io = max_events * sizeof(union viosrp_iu);
2100
2101
2102 desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 *
2103 IBMVSCSI_CMDS_PER_LUN_DEFAULT);
2104
2105 return desired_io;
2106}
2107
2108static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata)
2109{
2110 int rc;
2111 char *action = "reset";
2112
2113 if (hostdata->reset_crq) {
2114 smp_rmb();
2115 hostdata->reset_crq = 0;
2116
2117 rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
2118 if (!rc)
2119 rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
2120 vio_enable_interrupts(to_vio_dev(hostdata->dev));
2121 } else if (hostdata->reenable_crq) {
2122 smp_rmb();
2123 action = "enable";
2124 rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata);
2125 hostdata->reenable_crq = 0;
2126 if (!rc)
2127 rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
2128 } else
2129 return;
2130
2131 if (rc) {
2132 atomic_set(&hostdata->request_limit, -1);
2133 dev_err(hostdata->dev, "error after %s\n", action);
2134 }
2135
2136 scsi_unblock_requests(hostdata->host);
2137}
2138
2139static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
2140{
2141 if (kthread_should_stop())
2142 return 1;
2143 else if (hostdata->reset_crq) {
2144 smp_rmb();
2145 return 1;
2146 } else if (hostdata->reenable_crq) {
2147 smp_rmb();
2148 return 1;
2149 }
2150
2151 return 0;
2152}
2153
2154static int ibmvscsi_work(void *data)
2155{
2156 struct ibmvscsi_host_data *hostdata = data;
2157 int rc;
2158
2159 set_user_nice(current, MIN_NICE);
2160
2161 while (1) {
2162 rc = wait_event_interruptible(hostdata->work_wait_q,
2163 ibmvscsi_work_to_do(hostdata));
2164
2165 BUG_ON(rc);
2166
2167 if (kthread_should_stop())
2168 break;
2169
2170 ibmvscsi_do_work(hostdata);
2171 }
2172
2173 return 0;
2174}
2175
2176
2177
2178
2179static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
2180{
2181 struct ibmvscsi_host_data *hostdata;
2182 struct Scsi_Host *host;
2183 struct device *dev = &vdev->dev;
2184 struct srp_rport_identifiers ids;
2185 struct srp_rport *rport;
2186 unsigned long wait_switch = 0;
2187 int rc;
2188
2189 dev_set_drvdata(&vdev->dev, NULL);
2190
2191 host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
2192 if (!host) {
2193 dev_err(&vdev->dev, "couldn't allocate host data\n");
2194 goto scsi_host_alloc_failed;
2195 }
2196
2197 host->transportt = ibmvscsi_transport_template;
2198 hostdata = shost_priv(host);
2199 memset(hostdata, 0x00, sizeof(*hostdata));
2200 INIT_LIST_HEAD(&hostdata->sent);
2201 init_waitqueue_head(&hostdata->work_wait_q);
2202 hostdata->host = host;
2203 hostdata->dev = dev;
2204 atomic_set(&hostdata->request_limit, -1);
2205 hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT;
2206
2207 if (map_persist_bufs(hostdata)) {
2208 dev_err(&vdev->dev, "couldn't map persistent buffers\n");
2209 goto persist_bufs_failed;
2210 }
2211
2212 hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d",
2213 "ibmvscsi", host->host_no);
2214
2215 if (IS_ERR(hostdata->work_thread)) {
2216 dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n",
2217 PTR_ERR(hostdata->work_thread));
2218 goto init_crq_failed;
2219 }
2220
2221 rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events);
2222 if (rc != 0 && rc != H_RESOURCE) {
2223 dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);
2224 goto kill_kthread;
2225 }
2226 if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) {
2227 dev_err(&vdev->dev, "couldn't initialize event pool\n");
2228 goto init_pool_failed;
2229 }
2230
2231 host->max_lun = IBMVSCSI_MAX_LUN;
2232 host->max_id = max_id;
2233 host->max_channel = max_channel;
2234 host->max_cmd_len = 16;
2235
2236 dev_info(dev,
2237 "Maximum ID: %d Maximum LUN: %llu Maximum Channel: %d\n",
2238 host->max_id, host->max_lun, host->max_channel);
2239
2240 if (scsi_add_host(hostdata->host, hostdata->dev))
2241 goto add_host_failed;
2242
2243
2244 memcpy(ids.port_id, hostdata->madapter_info.partition_name,
2245 sizeof(ids.port_id));
2246 ids.roles = SRP_RPORT_ROLE_TARGET;
2247 rport = srp_rport_add(host, &ids);
2248 if (IS_ERR(rport))
2249 goto add_srp_port_failed;
2250
2251
2252
2253
2254
2255 if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0
2256 || rc == H_RESOURCE) {
2257
2258
2259
2260
2261
2262
2263 for (wait_switch = jiffies + (init_timeout * HZ);
2264 time_before(jiffies, wait_switch) &&
2265 atomic_read(&hostdata->request_limit) < 2;) {
2266
2267 msleep(10);
2268 }
2269
2270
2271 if (atomic_read(&hostdata->request_limit) > 0)
2272 scsi_scan_host(host);
2273 }
2274
2275 dev_set_drvdata(&vdev->dev, hostdata);
2276 list_add_tail(&hostdata->host_list, &ibmvscsi_head);
2277 return 0;
2278
2279 add_srp_port_failed:
2280 scsi_remove_host(hostdata->host);
2281 add_host_failed:
2282 release_event_pool(&hostdata->pool, hostdata);
2283 init_pool_failed:
2284 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events);
2285 kill_kthread:
2286 kthread_stop(hostdata->work_thread);
2287 init_crq_failed:
2288 unmap_persist_bufs(hostdata);
2289 persist_bufs_failed:
2290 scsi_host_put(host);
2291 scsi_host_alloc_failed:
2292 return -1;
2293}
2294
2295static int ibmvscsi_remove(struct vio_dev *vdev)
2296{
2297 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);
2298 list_del(&hostdata->host_list);
2299 unmap_persist_bufs(hostdata);
2300 release_event_pool(&hostdata->pool, hostdata);
2301 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
2302 max_events);
2303
2304 kthread_stop(hostdata->work_thread);
2305 srp_remove_host(hostdata->host);
2306 scsi_remove_host(hostdata->host);
2307 scsi_host_put(hostdata->host);
2308
2309 return 0;
2310}
2311
2312
2313
2314
2315
2316
2317
2318
2319static int ibmvscsi_resume(struct device *dev)
2320{
2321 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev);
2322 vio_disable_interrupts(to_vio_dev(hostdata->dev));
2323 tasklet_schedule(&hostdata->srp_task);
2324
2325 return 0;
2326}
2327
2328
2329
2330
2331
2332static const struct vio_device_id ibmvscsi_device_table[] = {
2333 {"vscsi", "IBM,v-scsi"},
2334 { "", "" }
2335};
2336MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
2337
2338static const struct dev_pm_ops ibmvscsi_pm_ops = {
2339 .resume = ibmvscsi_resume
2340};
2341
2342static struct vio_driver ibmvscsi_driver = {
2343 .id_table = ibmvscsi_device_table,
2344 .probe = ibmvscsi_probe,
2345 .remove = ibmvscsi_remove,
2346 .get_desired_dma = ibmvscsi_get_desired_dma,
2347 .name = "ibmvscsi",
2348 .pm = &ibmvscsi_pm_ops,
2349};
2350
2351static struct srp_function_template ibmvscsi_transport_functions = {
2352};
2353
2354int __init ibmvscsi_module_init(void)
2355{
2356 int ret;
2357
2358
2359 driver_template.can_queue = max_requests;
2360 max_events = max_requests + 2;
2361
2362 if (!firmware_has_feature(FW_FEATURE_VIO))
2363 return -ENODEV;
2364
2365 ibmvscsi_transport_template =
2366 srp_attach_transport(&ibmvscsi_transport_functions);
2367 if (!ibmvscsi_transport_template)
2368 return -ENOMEM;
2369
2370 ret = vio_register_driver(&ibmvscsi_driver);
2371 if (ret)
2372 srp_release_transport(ibmvscsi_transport_template);
2373 return ret;
2374}
2375
2376void __exit ibmvscsi_module_exit(void)
2377{
2378 vio_unregister_driver(&ibmvscsi_driver);
2379 srp_release_transport(ibmvscsi_transport_template);
2380}
2381
2382module_init(ibmvscsi_module_init);
2383module_exit(ibmvscsi_module_exit);
2384