1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49#include <linux/module.h>
50#include <linux/moduleparam.h>
51#include <linux/dma-mapping.h>
52#include <linux/delay.h>
53#include <linux/slab.h>
54#include <linux/of.h>
55#include <linux/pm.h>
56#include <linux/kthread.h>
57#include <asm/firmware.h>
58#include <asm/vio.h>
59#include <scsi/scsi.h>
60#include <scsi/scsi_cmnd.h>
61#include <scsi/scsi_host.h>
62#include <scsi/scsi_device.h>
63#include <scsi/scsi_transport_srp.h>
64#include "ibmvscsi.h"
65
66
67
68
69
70
71static int max_id = 64;
72static int max_channel = 3;
73static int init_timeout = 300;
74static int login_timeout = 60;
75static int info_timeout = 30;
76static int abort_timeout = 60;
77static int reset_timeout = 60;
78static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
79static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2;
80static int fast_fail = 1;
81static int client_reserve = 1;
82static char partition_name[96] = "UNKNOWN";
83static unsigned int partition_number = -1;
84static LIST_HEAD(ibmvscsi_head);
85static DEFINE_SPINLOCK(ibmvscsi_driver_lock);
86
87static struct scsi_transport_template *ibmvscsi_transport_template;
88
89#define IBMVSCSI_VERSION "1.5.9"
90
91MODULE_DESCRIPTION("IBM Virtual SCSI");
92MODULE_AUTHOR("Dave Boutcher");
93MODULE_LICENSE("GPL");
94MODULE_VERSION(IBMVSCSI_VERSION);
95
96module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
97MODULE_PARM_DESC(max_id, "Largest ID value for each channel [Default=64]");
98module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
99MODULE_PARM_DESC(max_channel, "Largest channel value [Default=3]");
100module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
101MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
102module_param_named(max_requests, max_requests, int, S_IRUGO);
103MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
104module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR);
105MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]");
106module_param_named(client_reserve, client_reserve, int, S_IRUGO );
107MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release");
108
109static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
110 struct ibmvscsi_host_data *hostdata);
111
112
113
114
115
116
117
118
119
120
121
122
123static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance)
124{
125 struct ibmvscsi_host_data *hostdata =
126 (struct ibmvscsi_host_data *)dev_instance;
127 vio_disable_interrupts(to_vio_dev(hostdata->dev));
128 tasklet_schedule(&hostdata->srp_task);
129 return IRQ_HANDLED;
130}
131
132
133
134
135
136
137
138
139
140
141static void ibmvscsi_release_crq_queue(struct crq_queue *queue,
142 struct ibmvscsi_host_data *hostdata,
143 int max_requests)
144{
145 long rc = 0;
146 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
147 free_irq(vdev->irq, (void *)hostdata);
148 tasklet_kill(&hostdata->srp_task);
149 do {
150 if (rc)
151 msleep(100);
152 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
153 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
154 dma_unmap_single(hostdata->dev,
155 queue->msg_token,
156 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
157 free_page((unsigned long)queue->msgs);
158}
159
160
161
162
163
164
165
166
167static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue)
168{
169 struct viosrp_crq *crq;
170 unsigned long flags;
171
172 spin_lock_irqsave(&queue->lock, flags);
173 crq = &queue->msgs[queue->cur];
174 if (crq->valid != VIOSRP_CRQ_FREE) {
175 if (++queue->cur == queue->size)
176 queue->cur = 0;
177
178
179
180
181 rmb();
182 } else
183 crq = NULL;
184 spin_unlock_irqrestore(&queue->lock, flags);
185
186 return crq;
187}
188
189
190
191
192
193
194
195static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
196 u64 word1, u64 word2)
197{
198 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
199
200
201
202
203
204 mb();
205 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
206}
207
208
209
210
211
212static void ibmvscsi_task(void *data)
213{
214 struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data;
215 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
216 struct viosrp_crq *crq;
217 int done = 0;
218
219 while (!done) {
220
221 while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
222 ibmvscsi_handle_crq(crq, hostdata);
223 crq->valid = VIOSRP_CRQ_FREE;
224 wmb();
225 }
226
227 vio_enable_interrupts(vdev);
228 crq = crq_queue_next_crq(&hostdata->queue);
229 if (crq != NULL) {
230 vio_disable_interrupts(vdev);
231 ibmvscsi_handle_crq(crq, hostdata);
232 crq->valid = VIOSRP_CRQ_FREE;
233 wmb();
234 } else {
235 done = 1;
236 }
237 }
238}
239
240static void gather_partition_info(void)
241{
242 const char *ppartition_name;
243 const __be32 *p_number_ptr;
244
245
246 if (!of_root)
247 return;
248
249 of_node_get(of_root);
250
251 ppartition_name = of_get_property(of_root, "ibm,partition-name", NULL);
252 if (ppartition_name)
253 strlcpy(partition_name, ppartition_name,
254 sizeof(partition_name));
255 p_number_ptr = of_get_property(of_root, "ibm,partition-no", NULL);
256 if (p_number_ptr)
257 partition_number = of_read_number(p_number_ptr, 1);
258 of_node_put(of_root);
259}
260
261static void set_adapter_info(struct ibmvscsi_host_data *hostdata)
262{
263 memset(&hostdata->madapter_info, 0x00,
264 sizeof(hostdata->madapter_info));
265
266 dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION);
267 strcpy(hostdata->madapter_info.srp_version, SRP_VERSION);
268
269 strncpy(hostdata->madapter_info.partition_name, partition_name,
270 sizeof(hostdata->madapter_info.partition_name));
271
272 hostdata->madapter_info.partition_number =
273 cpu_to_be32(partition_number);
274
275 hostdata->madapter_info.mad_version = cpu_to_be32(SRP_MAD_VERSION_1);
276 hostdata->madapter_info.os_type = cpu_to_be32(SRP_MAD_OS_LINUX);
277}
278
279
280
281
282
283
284static int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
285 struct ibmvscsi_host_data *hostdata)
286{
287 int rc = 0;
288 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
289
290
291 do {
292 if (rc)
293 msleep(100);
294 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
295 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
296
297
298 memset(queue->msgs, 0x00, PAGE_SIZE);
299 queue->cur = 0;
300
301 set_adapter_info(hostdata);
302
303
304 rc = plpar_hcall_norets(H_REG_CRQ,
305 vdev->unit_address,
306 queue->msg_token, PAGE_SIZE);
307 if (rc == H_CLOSED) {
308
309 dev_warn(hostdata->dev, "Partner adapter not ready\n");
310 } else if (rc != 0) {
311 dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc);
312 }
313 return rc;
314}
315
316
317
318
319
320
321
322
323
324
325
326static int ibmvscsi_init_crq_queue(struct crq_queue *queue,
327 struct ibmvscsi_host_data *hostdata,
328 int max_requests)
329{
330 int rc;
331 int retrc;
332 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
333
334 queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
335
336 if (!queue->msgs)
337 goto malloc_failed;
338 queue->size = PAGE_SIZE / sizeof(*queue->msgs);
339
340 queue->msg_token = dma_map_single(hostdata->dev, queue->msgs,
341 queue->size * sizeof(*queue->msgs),
342 DMA_BIDIRECTIONAL);
343
344 if (dma_mapping_error(hostdata->dev, queue->msg_token))
345 goto map_failed;
346
347 gather_partition_info();
348 set_adapter_info(hostdata);
349
350 retrc = rc = plpar_hcall_norets(H_REG_CRQ,
351 vdev->unit_address,
352 queue->msg_token, PAGE_SIZE);
353 if (rc == H_RESOURCE)
354
355 rc = ibmvscsi_reset_crq_queue(queue,
356 hostdata);
357
358 if (rc == H_CLOSED) {
359
360 dev_warn(hostdata->dev, "Partner adapter not ready\n");
361 retrc = 0;
362 } else if (rc != 0) {
363 dev_warn(hostdata->dev, "Error %d opening adapter\n", rc);
364 goto reg_crq_failed;
365 }
366
367 queue->cur = 0;
368 spin_lock_init(&queue->lock);
369
370 tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task,
371 (unsigned long)hostdata);
372
373 if (request_irq(vdev->irq,
374 ibmvscsi_handle_event,
375 0, "ibmvscsi", (void *)hostdata) != 0) {
376 dev_err(hostdata->dev, "couldn't register irq 0x%x\n",
377 vdev->irq);
378 goto req_irq_failed;
379 }
380
381 rc = vio_enable_interrupts(vdev);
382 if (rc != 0) {
383 dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc);
384 goto req_irq_failed;
385 }
386
387 return retrc;
388
389 req_irq_failed:
390 tasklet_kill(&hostdata->srp_task);
391 rc = 0;
392 do {
393 if (rc)
394 msleep(100);
395 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
396 } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
397 reg_crq_failed:
398 dma_unmap_single(hostdata->dev,
399 queue->msg_token,
400 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
401 map_failed:
402 free_page((unsigned long)queue->msgs);
403 malloc_failed:
404 return -1;
405}
406
407
408
409
410
411
412static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
413 struct ibmvscsi_host_data *hostdata)
414{
415 int rc = 0;
416 struct vio_dev *vdev = to_vio_dev(hostdata->dev);
417
418 set_adapter_info(hostdata);
419
420
421 do {
422 if (rc)
423 msleep(100);
424 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
425 } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
426
427 if (rc)
428 dev_err(hostdata->dev, "Error %d enabling adapter\n", rc);
429 return rc;
430}
431
432
433
434
435
436
437
438
439
440
441
442
443static int initialize_event_pool(struct event_pool *pool,
444 int size, struct ibmvscsi_host_data *hostdata)
445{
446 int i;
447
448 pool->size = size;
449 pool->next = 0;
450 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
451 if (!pool->events)
452 return -ENOMEM;
453
454 pool->iu_storage =
455 dma_alloc_coherent(hostdata->dev,
456 pool->size * sizeof(*pool->iu_storage),
457 &pool->iu_token, 0);
458 if (!pool->iu_storage) {
459 kfree(pool->events);
460 return -ENOMEM;
461 }
462
463 for (i = 0; i < pool->size; ++i) {
464 struct srp_event_struct *evt = &pool->events[i];
465 memset(&evt->crq, 0x00, sizeof(evt->crq));
466 atomic_set(&evt->free, 1);
467 evt->crq.valid = VIOSRP_CRQ_CMD_RSP;
468 evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu));
469 evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token +
470 sizeof(*evt->xfer_iu) * i);
471 evt->xfer_iu = pool->iu_storage + i;
472 evt->hostdata = hostdata;
473 evt->ext_list = NULL;
474 evt->ext_list_token = 0;
475 }
476
477 return 0;
478}
479
480
481
482
483
484
485
486
487static void release_event_pool(struct event_pool *pool,
488 struct ibmvscsi_host_data *hostdata)
489{
490 int i, in_use = 0;
491 for (i = 0; i < pool->size; ++i) {
492 if (atomic_read(&pool->events[i].free) != 1)
493 ++in_use;
494 if (pool->events[i].ext_list) {
495 dma_free_coherent(hostdata->dev,
496 SG_ALL * sizeof(struct srp_direct_buf),
497 pool->events[i].ext_list,
498 pool->events[i].ext_list_token);
499 }
500 }
501 if (in_use)
502 dev_warn(hostdata->dev, "releasing event pool with %d "
503 "events still in use?\n", in_use);
504 kfree(pool->events);
505 dma_free_coherent(hostdata->dev,
506 pool->size * sizeof(*pool->iu_storage),
507 pool->iu_storage, pool->iu_token);
508}
509
510
511
512
513
514
515
516
517static int valid_event_struct(struct event_pool *pool,
518 struct srp_event_struct *evt)
519{
520 int index = evt - pool->events;
521 if (index < 0 || index >= pool->size)
522 return 0;
523 if (evt != pool->events + index)
524 return 0;
525 return 1;
526}
527
528
529
530
531
532
533static void free_event_struct(struct event_pool *pool,
534 struct srp_event_struct *evt)
535{
536 if (!valid_event_struct(pool, evt)) {
537 dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p "
538 "(not in pool %p)\n", evt, pool->events);
539 return;
540 }
541 if (atomic_inc_return(&evt->free) != 1) {
542 dev_err(evt->hostdata->dev, "Freeing event_struct %p "
543 "which is not in use!\n", evt);
544 return;
545 }
546}
547
548
549
550
551
552
553
554
555
556static struct srp_event_struct *get_event_struct(struct event_pool *pool)
557{
558 int i;
559 int poolsize = pool->size;
560 int offset = pool->next;
561
562 for (i = 0; i < poolsize; i++) {
563 offset = (offset + 1) % poolsize;
564 if (!atomic_dec_if_positive(&pool->events[offset].free)) {
565 pool->next = offset;
566 return &pool->events[offset];
567 }
568 }
569
570 printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
571 return NULL;
572}
573
574
575
576
577
578
579
580
581
582static void init_event_struct(struct srp_event_struct *evt_struct,
583 void (*done) (struct srp_event_struct *),
584 u8 format,
585 int timeout)
586{
587 evt_struct->cmnd = NULL;
588 evt_struct->cmnd_done = NULL;
589 evt_struct->sync_srp = NULL;
590 evt_struct->crq.format = format;
591 evt_struct->crq.timeout = cpu_to_be16(timeout);
592 evt_struct->done = done;
593}
594
595
596
597
598
599
600
601
602
603
604static void set_srp_direction(struct scsi_cmnd *cmd,
605 struct srp_cmd *srp_cmd,
606 int numbuf)
607{
608 u8 fmt;
609
610 if (numbuf == 0)
611 return;
612
613 if (numbuf == 1)
614 fmt = SRP_DATA_DESC_DIRECT;
615 else {
616 fmt = SRP_DATA_DESC_INDIRECT;
617 numbuf = min(numbuf, MAX_INDIRECT_BUFS);
618
619 if (cmd->sc_data_direction == DMA_TO_DEVICE)
620 srp_cmd->data_out_desc_cnt = numbuf;
621 else
622 srp_cmd->data_in_desc_cnt = numbuf;
623 }
624
625 if (cmd->sc_data_direction == DMA_TO_DEVICE)
626 srp_cmd->buf_fmt = fmt << 4;
627 else
628 srp_cmd->buf_fmt = fmt;
629}
630
631
632
633
634
635
636
637static void unmap_cmd_data(struct srp_cmd *cmd,
638 struct srp_event_struct *evt_struct,
639 struct device *dev)
640{
641 u8 out_fmt, in_fmt;
642
643 out_fmt = cmd->buf_fmt >> 4;
644 in_fmt = cmd->buf_fmt & ((1U << 4) - 1);
645
646 if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)
647 return;
648
649 if (evt_struct->cmnd)
650 scsi_dma_unmap(evt_struct->cmnd);
651}
652
653static int map_sg_list(struct scsi_cmnd *cmd, int nseg,
654 struct srp_direct_buf *md)
655{
656 int i;
657 struct scatterlist *sg;
658 u64 total_length = 0;
659
660 scsi_for_each_sg(cmd, sg, nseg, i) {
661 struct srp_direct_buf *descr = md + i;
662 descr->va = cpu_to_be64(sg_dma_address(sg));
663 descr->len = cpu_to_be32(sg_dma_len(sg));
664 descr->key = 0;
665 total_length += sg_dma_len(sg);
666 }
667 return total_length;
668}
669
670
671
672
673
674
675
676
677
678
679
680static int map_sg_data(struct scsi_cmnd *cmd,
681 struct srp_event_struct *evt_struct,
682 struct srp_cmd *srp_cmd, struct device *dev)
683{
684
685 int sg_mapped;
686 u64 total_length = 0;
687 struct srp_direct_buf *data =
688 (struct srp_direct_buf *) srp_cmd->add_data;
689 struct srp_indirect_buf *indirect =
690 (struct srp_indirect_buf *) data;
691
692 sg_mapped = scsi_dma_map(cmd);
693 if (!sg_mapped)
694 return 1;
695 else if (sg_mapped < 0)
696 return 0;
697
698 set_srp_direction(cmd, srp_cmd, sg_mapped);
699
700
701 if (sg_mapped == 1) {
702 map_sg_list(cmd, sg_mapped, data);
703 return 1;
704 }
705
706 indirect->table_desc.va = 0;
707 indirect->table_desc.len = cpu_to_be32(sg_mapped *
708 sizeof(struct srp_direct_buf));
709 indirect->table_desc.key = 0;
710
711 if (sg_mapped <= MAX_INDIRECT_BUFS) {
712 total_length = map_sg_list(cmd, sg_mapped,
713 &indirect->desc_list[0]);
714 indirect->len = cpu_to_be32(total_length);
715 return 1;
716 }
717
718
719 if (!evt_struct->ext_list) {
720 evt_struct->ext_list = dma_alloc_coherent(dev,
721 SG_ALL * sizeof(struct srp_direct_buf),
722 &evt_struct->ext_list_token, 0);
723 if (!evt_struct->ext_list) {
724 if (!firmware_has_feature(FW_FEATURE_CMO))
725 sdev_printk(KERN_ERR, cmd->device,
726 "Can't allocate memory "
727 "for indirect table\n");
728 scsi_dma_unmap(cmd);
729 return 0;
730 }
731 }
732
733 total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list);
734
735 indirect->len = cpu_to_be32(total_length);
736 indirect->table_desc.va = cpu_to_be64(evt_struct->ext_list_token);
737 indirect->table_desc.len = cpu_to_be32(sg_mapped *
738 sizeof(indirect->desc_list[0]));
739 memcpy(indirect->desc_list, evt_struct->ext_list,
740 MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
741 return 1;
742}
743
744
745
746
747
748
749
750
751
752
753
754static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
755 struct srp_event_struct *evt_struct,
756 struct srp_cmd *srp_cmd, struct device *dev)
757{
758 switch (cmd->sc_data_direction) {
759 case DMA_FROM_DEVICE:
760 case DMA_TO_DEVICE:
761 break;
762 case DMA_NONE:
763 return 1;
764 case DMA_BIDIRECTIONAL:
765 sdev_printk(KERN_ERR, cmd->device,
766 "Can't map DMA_BIDIRECTIONAL to read/write\n");
767 return 0;
768 default:
769 sdev_printk(KERN_ERR, cmd->device,
770 "Unknown data direction 0x%02x; can't map!\n",
771 cmd->sc_data_direction);
772 return 0;
773 }
774
775 return map_sg_data(cmd, evt_struct, srp_cmd, dev);
776}
777
778
779
780
781
782
783static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
784{
785 struct srp_event_struct *evt;
786 unsigned long flags;
787
788 spin_lock_irqsave(hostdata->host->host_lock, flags);
789 while (!list_empty(&hostdata->sent)) {
790 evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list);
791 list_del(&evt->list);
792 del_timer(&evt->timer);
793
794 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
795 if (evt->cmnd) {
796 evt->cmnd->result = (error_code << 16);
797 unmap_cmd_data(&evt->iu.srp.cmd, evt,
798 evt->hostdata->dev);
799 if (evt->cmnd_done)
800 evt->cmnd_done(evt->cmnd);
801 } else if (evt->done && evt->crq.format != VIOSRP_MAD_FORMAT &&
802 evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
803 evt->done(evt);
804 free_event_struct(&evt->hostdata->pool, evt);
805 spin_lock_irqsave(hostdata->host->host_lock, flags);
806 }
807 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
808}
809
810
811
812
813
814
815
816
817static void ibmvscsi_set_request_limit(struct ibmvscsi_host_data *hostdata, int limit)
818{
819 unsigned long flags;
820
821 spin_lock_irqsave(hostdata->host->host_lock, flags);
822 atomic_set(&hostdata->request_limit, limit);
823 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
824}
825
826
827
828
829
830static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
831{
832 scsi_block_requests(hostdata->host);
833 ibmvscsi_set_request_limit(hostdata, 0);
834
835 purge_requests(hostdata, DID_ERROR);
836 hostdata->action = IBMVSCSI_HOST_ACTION_RESET;
837 wake_up(&hostdata->work_wait_q);
838}
839
840
841
842
843
844
845
846static void ibmvscsi_timeout(struct timer_list *t)
847{
848 struct srp_event_struct *evt_struct = from_timer(evt_struct, t, timer);
849 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
850
851 dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
852 evt_struct->iu.srp.cmd.opcode);
853
854 ibmvscsi_reset_host(hostdata);
855}
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
871 struct ibmvscsi_host_data *hostdata,
872 unsigned long timeout)
873{
874 __be64 *crq_as_u64 = (__be64 *)&evt_struct->crq;
875 int request_status = 0;
876 int rc;
877 int srp_req = 0;
878
879
880
881
882
883
884
885 if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
886 srp_req = 1;
887 request_status =
888 atomic_dec_if_positive(&hostdata->request_limit);
889
890
891
892 if (request_status < -1)
893 goto send_error;
894
895
896
897
898
899 else if (request_status == -1 &&
900 evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
901 goto send_busy;
902
903
904
905
906 else if (request_status < 2 &&
907 evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
908
909
910
911
912
913
914
915 int server_limit = request_status;
916 struct srp_event_struct *tmp_evt;
917
918 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
919 server_limit++;
920 }
921
922 if (server_limit > 2)
923 goto send_busy;
924 }
925 }
926
927
928 *evt_struct->xfer_iu = evt_struct->iu;
929 evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
930
931
932
933
934
935 list_add_tail(&evt_struct->list, &hostdata->sent);
936
937 timer_setup(&evt_struct->timer, ibmvscsi_timeout, 0);
938 if (timeout) {
939 evt_struct->timer.expires = jiffies + (timeout * HZ);
940 add_timer(&evt_struct->timer);
941 }
942
943 rc = ibmvscsi_send_crq(hostdata, be64_to_cpu(crq_as_u64[0]),
944 be64_to_cpu(crq_as_u64[1]));
945 if (rc != 0) {
946 list_del(&evt_struct->list);
947 del_timer(&evt_struct->timer);
948
949
950
951
952
953
954 if (rc == H_CLOSED) {
955 dev_warn(hostdata->dev, "send warning. "
956 "Receive queue closed, will retry.\n");
957 goto send_busy;
958 }
959 dev_err(hostdata->dev, "send error %d\n", rc);
960 if (srp_req)
961 atomic_inc(&hostdata->request_limit);
962 goto send_error;
963 }
964
965 return 0;
966
967 send_busy:
968 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
969
970 free_event_struct(&hostdata->pool, evt_struct);
971 if (srp_req && request_status != -1)
972 atomic_inc(&hostdata->request_limit);
973 return SCSI_MLQUEUE_HOST_BUSY;
974
975 send_error:
976 unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
977
978 if (evt_struct->cmnd != NULL) {
979 evt_struct->cmnd->result = DID_ERROR << 16;
980 evt_struct->cmnd_done(evt_struct->cmnd);
981 } else if (evt_struct->done)
982 evt_struct->done(evt_struct);
983
984 free_event_struct(&hostdata->pool, evt_struct);
985 return 0;
986}
987
988
989
990
991
992
993
994
995static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
996{
997 struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
998 struct scsi_cmnd *cmnd = evt_struct->cmnd;
999
1000 if (unlikely(rsp->opcode != SRP_RSP)) {
1001 if (printk_ratelimit())
1002 dev_warn(evt_struct->hostdata->dev,
1003 "bad SRP RSP type %#02x\n", rsp->opcode);
1004 }
1005
1006 if (cmnd) {
1007 cmnd->result |= rsp->status;
1008 if (scsi_status_is_check_condition(cmnd->result))
1009 memcpy(cmnd->sense_buffer,
1010 rsp->data,
1011 be32_to_cpu(rsp->sense_data_len));
1012 unmap_cmd_data(&evt_struct->iu.srp.cmd,
1013 evt_struct,
1014 evt_struct->hostdata->dev);
1015
1016 if (rsp->flags & SRP_RSP_FLAG_DOOVER)
1017 scsi_set_resid(cmnd,
1018 be32_to_cpu(rsp->data_out_res_cnt));
1019 else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
1020 scsi_set_resid(cmnd, be32_to_cpu(rsp->data_in_res_cnt));
1021 }
1022
1023 if (evt_struct->cmnd_done)
1024 evt_struct->cmnd_done(cmnd);
1025}
1026
1027
1028
1029
1030
1031
1032static inline u16 lun_from_dev(struct scsi_device *dev)
1033{
1034 return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
1035}
1036
1037
1038
1039
1040
1041
1042static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd,
1043 void (*done) (struct scsi_cmnd *))
1044{
1045 struct srp_cmd *srp_cmd;
1046 struct srp_event_struct *evt_struct;
1047 struct srp_indirect_buf *indirect;
1048 struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host);
1049 u16 lun = lun_from_dev(cmnd->device);
1050 u8 out_fmt, in_fmt;
1051
1052 cmnd->result = (DID_OK << 16);
1053 evt_struct = get_event_struct(&hostdata->pool);
1054 if (!evt_struct)
1055 return SCSI_MLQUEUE_HOST_BUSY;
1056
1057
1058 srp_cmd = &evt_struct->iu.srp.cmd;
1059 memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
1060 srp_cmd->opcode = SRP_CMD;
1061 memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb));
1062 int_to_scsilun(lun, &srp_cmd->lun);
1063
1064 if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
1065 if (!firmware_has_feature(FW_FEATURE_CMO))
1066 sdev_printk(KERN_ERR, cmnd->device,
1067 "couldn't convert cmd to srp_cmd\n");
1068 free_event_struct(&hostdata->pool, evt_struct);
1069 return SCSI_MLQUEUE_HOST_BUSY;
1070 }
1071
1072 init_event_struct(evt_struct,
1073 handle_cmd_rsp,
1074 VIOSRP_SRP_FORMAT,
1075 scsi_cmd_to_rq(cmnd)->timeout / HZ);
1076
1077 evt_struct->cmnd = cmnd;
1078 evt_struct->cmnd_done = done;
1079
1080
1081 indirect = (struct srp_indirect_buf *) srp_cmd->add_data;
1082 out_fmt = srp_cmd->buf_fmt >> 4;
1083 in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);
1084 if ((in_fmt == SRP_DATA_DESC_INDIRECT ||
1085 out_fmt == SRP_DATA_DESC_INDIRECT) &&
1086 indirect->table_desc.va == 0) {
1087 indirect->table_desc.va =
1088 cpu_to_be64(be64_to_cpu(evt_struct->crq.IU_data_ptr) +
1089 offsetof(struct srp_cmd, add_data) +
1090 offsetof(struct srp_indirect_buf, desc_list));
1091 }
1092
1093 return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
1094}
1095
1096static DEF_SCSI_QCMD(ibmvscsi_queuecommand)
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109static int map_persist_bufs(struct ibmvscsi_host_data *hostdata)
1110{
1111
1112 hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps,
1113 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1114
1115 if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) {
1116 dev_err(hostdata->dev, "Unable to map capabilities buffer!\n");
1117 return 1;
1118 }
1119
1120 hostdata->adapter_info_addr = dma_map_single(hostdata->dev,
1121 &hostdata->madapter_info,
1122 sizeof(hostdata->madapter_info),
1123 DMA_BIDIRECTIONAL);
1124 if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) {
1125 dev_err(hostdata->dev, "Unable to map adapter info buffer!\n");
1126 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
1127 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1128 return 1;
1129 }
1130
1131 return 0;
1132}
1133
1134
1135
1136
1137
1138
1139
1140static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata)
1141{
1142 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
1143 sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1144
1145 dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr,
1146 sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL);
1147}
1148
1149
1150
1151
1152
1153
1154
1155
1156static void login_rsp(struct srp_event_struct *evt_struct)
1157{
1158 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1159 switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
1160 case SRP_LOGIN_RSP:
1161 break;
1162 case SRP_LOGIN_REJ:
1163 dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
1164 evt_struct->xfer_iu->srp.login_rej.reason);
1165
1166 ibmvscsi_set_request_limit(hostdata, -1);
1167 return;
1168 default:
1169 dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",
1170 evt_struct->xfer_iu->srp.login_rsp.opcode);
1171
1172 ibmvscsi_set_request_limit(hostdata, -1);
1173 return;
1174 }
1175
1176 dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
1177 hostdata->client_migrated = 0;
1178
1179
1180
1181
1182
1183 ibmvscsi_set_request_limit(hostdata,
1184 be32_to_cpu(evt_struct->xfer_iu->srp.login_rsp.req_lim_delta));
1185
1186
1187 hostdata->action = IBMVSCSI_HOST_ACTION_UNBLOCK;
1188 wake_up(&hostdata->work_wait_q);
1189}
1190
1191
1192
1193
1194
1195
1196
1197static int send_srp_login(struct ibmvscsi_host_data *hostdata)
1198{
1199 int rc;
1200 unsigned long flags;
1201 struct srp_login_req *login;
1202 struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
1203
1204 BUG_ON(!evt_struct);
1205 init_event_struct(evt_struct, login_rsp,
1206 VIOSRP_SRP_FORMAT, login_timeout);
1207
1208 login = &evt_struct->iu.srp.login_req;
1209 memset(login, 0, sizeof(*login));
1210 login->opcode = SRP_LOGIN_REQ;
1211 login->req_it_iu_len = cpu_to_be32(sizeof(union srp_iu));
1212 login->req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
1213 SRP_BUF_FORMAT_INDIRECT);
1214
1215
1216
1217
1218
1219 ibmvscsi_set_request_limit(hostdata, 0);
1220
1221 spin_lock_irqsave(hostdata->host->host_lock, flags);
1222 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2);
1223 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1224 dev_info(hostdata->dev, "sent SRP login\n");
1225 return rc;
1226};
1227
1228
1229
1230
1231
1232
1233
1234static void capabilities_rsp(struct srp_event_struct *evt_struct)
1235{
1236 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1237
1238 if (evt_struct->xfer_iu->mad.capabilities.common.status) {
1239 dev_err(hostdata->dev, "error 0x%X getting capabilities info\n",
1240 evt_struct->xfer_iu->mad.capabilities.common.status);
1241 } else {
1242 if (hostdata->caps.migration.common.server_support !=
1243 cpu_to_be16(SERVER_SUPPORTS_CAP))
1244 dev_info(hostdata->dev, "Partition migration not supported\n");
1245
1246 if (client_reserve) {
1247 if (hostdata->caps.reserve.common.server_support ==
1248 cpu_to_be16(SERVER_SUPPORTS_CAP))
1249 dev_info(hostdata->dev, "Client reserve enabled\n");
1250 else
1251 dev_info(hostdata->dev, "Client reserve not supported\n");
1252 }
1253 }
1254
1255 send_srp_login(hostdata);
1256}
1257
1258
1259
1260
1261
1262
1263static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata)
1264{
1265 struct viosrp_capabilities *req;
1266 struct srp_event_struct *evt_struct;
1267 unsigned long flags;
1268 struct device_node *of_node = hostdata->dev->of_node;
1269 const char *location;
1270
1271 evt_struct = get_event_struct(&hostdata->pool);
1272 BUG_ON(!evt_struct);
1273
1274 init_event_struct(evt_struct, capabilities_rsp,
1275 VIOSRP_MAD_FORMAT, info_timeout);
1276
1277 req = &evt_struct->iu.mad.capabilities;
1278 memset(req, 0, sizeof(*req));
1279
1280 hostdata->caps.flags = cpu_to_be32(CAP_LIST_SUPPORTED);
1281 if (hostdata->client_migrated)
1282 hostdata->caps.flags |= cpu_to_be32(CLIENT_MIGRATED);
1283
1284 strlcpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev),
1285 sizeof(hostdata->caps.name));
1286
1287 location = of_get_property(of_node, "ibm,loc-code", NULL);
1288 location = location ? location : dev_name(hostdata->dev);
1289 strlcpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc));
1290
1291 req->common.type = cpu_to_be32(VIOSRP_CAPABILITIES_TYPE);
1292 req->buffer = cpu_to_be64(hostdata->caps_addr);
1293
1294 hostdata->caps.migration.common.cap_type =
1295 cpu_to_be32(MIGRATION_CAPABILITIES);
1296 hostdata->caps.migration.common.length =
1297 cpu_to_be16(sizeof(hostdata->caps.migration));
1298 hostdata->caps.migration.common.server_support =
1299 cpu_to_be16(SERVER_SUPPORTS_CAP);
1300 hostdata->caps.migration.ecl = cpu_to_be32(1);
1301
1302 if (client_reserve) {
1303 hostdata->caps.reserve.common.cap_type =
1304 cpu_to_be32(RESERVATION_CAPABILITIES);
1305 hostdata->caps.reserve.common.length =
1306 cpu_to_be16(sizeof(hostdata->caps.reserve));
1307 hostdata->caps.reserve.common.server_support =
1308 cpu_to_be16(SERVER_SUPPORTS_CAP);
1309 hostdata->caps.reserve.type =
1310 cpu_to_be32(CLIENT_RESERVE_SCSI_2);
1311 req->common.length =
1312 cpu_to_be16(sizeof(hostdata->caps));
1313 } else
1314 req->common.length = cpu_to_be16(sizeof(hostdata->caps) -
1315 sizeof(hostdata->caps.reserve));
1316
1317 spin_lock_irqsave(hostdata->host->host_lock, flags);
1318 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1319 dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n");
1320 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1321};
1322
1323
1324
1325
1326
1327
1328
1329
1330static void fast_fail_rsp(struct srp_event_struct *evt_struct)
1331{
1332 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1333 u16 status = be16_to_cpu(evt_struct->xfer_iu->mad.fast_fail.common.status);
1334
1335 if (status == VIOSRP_MAD_NOT_SUPPORTED)
1336 dev_err(hostdata->dev, "fast_fail not supported in server\n");
1337 else if (status == VIOSRP_MAD_FAILED)
1338 dev_err(hostdata->dev, "fast_fail request failed\n");
1339 else if (status != VIOSRP_MAD_SUCCESS)
1340 dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);
1341
1342 send_mad_capabilities(hostdata);
1343}
1344
1345
1346
1347
1348
1349
1350
1351static int enable_fast_fail(struct ibmvscsi_host_data *hostdata)
1352{
1353 int rc;
1354 unsigned long flags;
1355 struct viosrp_fast_fail *fast_fail_mad;
1356 struct srp_event_struct *evt_struct;
1357
1358 if (!fast_fail) {
1359 send_mad_capabilities(hostdata);
1360 return 0;
1361 }
1362
1363 evt_struct = get_event_struct(&hostdata->pool);
1364 BUG_ON(!evt_struct);
1365
1366 init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout);
1367
1368 fast_fail_mad = &evt_struct->iu.mad.fast_fail;
1369 memset(fast_fail_mad, 0, sizeof(*fast_fail_mad));
1370 fast_fail_mad->common.type = cpu_to_be32(VIOSRP_ENABLE_FAST_FAIL);
1371 fast_fail_mad->common.length = cpu_to_be16(sizeof(*fast_fail_mad));
1372
1373 spin_lock_irqsave(hostdata->host->host_lock, flags);
1374 rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
1375 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1376 return rc;
1377}
1378
1379
1380
1381
1382
1383
1384
1385
1386static void adapter_info_rsp(struct srp_event_struct *evt_struct)
1387{
1388 struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1389
1390 if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
1391 dev_err(hostdata->dev, "error %d getting adapter info\n",
1392 evt_struct->xfer_iu->mad.adapter_info.common.status);
1393 } else {
1394 dev_info(hostdata->dev, "host srp version: %s, "
1395 "host partition %s (%d), OS %d, max io %u\n",
1396 hostdata->madapter_info.srp_version,
1397 hostdata->madapter_info.partition_name,
1398 be32_to_cpu(hostdata->madapter_info.partition_number),
1399 be32_to_cpu(hostdata->madapter_info.os_type),
1400 be32_to_cpu(hostdata->madapter_info.port_max_txu[0]));
1401
1402 if (hostdata->madapter_info.port_max_txu[0])
1403 hostdata->host->max_sectors =
1404 be32_to_cpu(hostdata->madapter_info.port_max_txu[0]) >> 9;
1405
1406 if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX &&
1407 strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
1408 dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
1409 hostdata->madapter_info.srp_version);
1410 dev_err(hostdata->dev, "limiting scatterlists to %d\n",
1411 MAX_INDIRECT_BUFS);
1412 hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
1413 }
1414
1415 if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX) {
1416 enable_fast_fail(hostdata);
1417 return;
1418 }
1419 }
1420
1421 send_srp_login(hostdata);
1422}
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
1434{
1435 struct viosrp_adapter_info *req;
1436 struct srp_event_struct *evt_struct;
1437 unsigned long flags;
1438
1439 evt_struct = get_event_struct(&hostdata->pool);
1440 BUG_ON(!evt_struct);
1441
1442 init_event_struct(evt_struct,
1443 adapter_info_rsp,
1444 VIOSRP_MAD_FORMAT,
1445 info_timeout);
1446
1447 req = &evt_struct->iu.mad.adapter_info;
1448 memset(req, 0x00, sizeof(*req));
1449
1450 req->common.type = cpu_to_be32(VIOSRP_ADAPTER_INFO_TYPE);
1451 req->common.length = cpu_to_be16(sizeof(hostdata->madapter_info));
1452 req->buffer = cpu_to_be64(hostdata->adapter_info_addr);
1453
1454 spin_lock_irqsave(hostdata->host->host_lock, flags);
1455 if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1456 dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
1457 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1458};
1459
1460
1461
1462
1463static void init_adapter(struct ibmvscsi_host_data *hostdata)
1464{
1465 send_mad_adapter_info(hostdata);
1466}
1467
1468
1469
1470
1471
1472
1473
1474static void sync_completion(struct srp_event_struct *evt_struct)
1475{
1476
1477 if (evt_struct->sync_srp)
1478 *evt_struct->sync_srp = *evt_struct->xfer_iu;
1479
1480 complete(&evt_struct->comp);
1481}
1482
1483
1484
1485
1486
1487static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
1488{
1489 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1490 struct srp_tsk_mgmt *tsk_mgmt;
1491 struct srp_event_struct *evt;
1492 struct srp_event_struct *tmp_evt, *found_evt;
1493 union viosrp_iu srp_rsp;
1494 int rsp_rc;
1495 unsigned long flags;
1496 u16 lun = lun_from_dev(cmd->device);
1497 unsigned long wait_switch = 0;
1498
1499
1500
1501
1502 spin_lock_irqsave(hostdata->host->host_lock, flags);
1503 wait_switch = jiffies + (init_timeout * HZ);
1504 do {
1505 found_evt = NULL;
1506 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1507 if (tmp_evt->cmnd == cmd) {
1508 found_evt = tmp_evt;
1509 break;
1510 }
1511 }
1512
1513 if (!found_evt) {
1514 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1515 return SUCCESS;
1516 }
1517
1518 evt = get_event_struct(&hostdata->pool);
1519 if (evt == NULL) {
1520 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1521 sdev_printk(KERN_ERR, cmd->device,
1522 "failed to allocate abort event\n");
1523 return FAILED;
1524 }
1525
1526 init_event_struct(evt,
1527 sync_completion,
1528 VIOSRP_SRP_FORMAT,
1529 abort_timeout);
1530
1531 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1532
1533
1534 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1535 tsk_mgmt->opcode = SRP_TSK_MGMT;
1536 int_to_scsilun(lun, &tsk_mgmt->lun);
1537 tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
1538 tsk_mgmt->task_tag = (u64) found_evt;
1539
1540 evt->sync_srp = &srp_rsp;
1541
1542 init_completion(&evt->comp);
1543 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2);
1544
1545 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1546 break;
1547
1548 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1549 msleep(10);
1550 spin_lock_irqsave(hostdata->host->host_lock, flags);
1551 } while (time_before(jiffies, wait_switch));
1552
1553 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1554
1555 if (rsp_rc != 0) {
1556 sdev_printk(KERN_ERR, cmd->device,
1557 "failed to send abort() event. rc=%d\n", rsp_rc);
1558 return FAILED;
1559 }
1560
1561 sdev_printk(KERN_INFO, cmd->device,
1562 "aborting command. lun 0x%llx, tag 0x%llx\n",
1563 (((u64) lun) << 48), (u64) found_evt);
1564
1565 wait_for_completion(&evt->comp);
1566
1567
1568 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1569 if (printk_ratelimit())
1570 sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
1571 srp_rsp.srp.rsp.opcode);
1572 return FAILED;
1573 }
1574
1575 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1576 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1577 else
1578 rsp_rc = srp_rsp.srp.rsp.status;
1579
1580 if (rsp_rc) {
1581 if (printk_ratelimit())
1582 sdev_printk(KERN_WARNING, cmd->device,
1583 "abort code %d for task tag 0x%llx\n",
1584 rsp_rc, tsk_mgmt->task_tag);
1585 return FAILED;
1586 }
1587
1588
1589
1590
1591
1592 spin_lock_irqsave(hostdata->host->host_lock, flags);
1593 found_evt = NULL;
1594 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1595 if (tmp_evt->cmnd == cmd) {
1596 found_evt = tmp_evt;
1597 break;
1598 }
1599 }
1600
1601 if (found_evt == NULL) {
1602 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1603 sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n",
1604 tsk_mgmt->task_tag);
1605 return SUCCESS;
1606 }
1607
1608 sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n",
1609 tsk_mgmt->task_tag);
1610
1611 cmd->result = (DID_ABORT << 16);
1612 list_del(&found_evt->list);
1613 unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
1614 found_evt->hostdata->dev);
1615 free_event_struct(&found_evt->hostdata->pool, found_evt);
1616 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1617 atomic_inc(&hostdata->request_limit);
1618 return SUCCESS;
1619}
1620
1621
1622
1623
1624
1625
1626static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
1627{
1628 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1629 struct srp_tsk_mgmt *tsk_mgmt;
1630 struct srp_event_struct *evt;
1631 struct srp_event_struct *tmp_evt, *pos;
1632 union viosrp_iu srp_rsp;
1633 int rsp_rc;
1634 unsigned long flags;
1635 u16 lun = lun_from_dev(cmd->device);
1636 unsigned long wait_switch = 0;
1637
1638 spin_lock_irqsave(hostdata->host->host_lock, flags);
1639 wait_switch = jiffies + (init_timeout * HZ);
1640 do {
1641 evt = get_event_struct(&hostdata->pool);
1642 if (evt == NULL) {
1643 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1644 sdev_printk(KERN_ERR, cmd->device,
1645 "failed to allocate reset event\n");
1646 return FAILED;
1647 }
1648
1649 init_event_struct(evt,
1650 sync_completion,
1651 VIOSRP_SRP_FORMAT,
1652 reset_timeout);
1653
1654 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1655
1656
1657 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1658 tsk_mgmt->opcode = SRP_TSK_MGMT;
1659 int_to_scsilun(lun, &tsk_mgmt->lun);
1660 tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
1661
1662 evt->sync_srp = &srp_rsp;
1663
1664 init_completion(&evt->comp);
1665 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2);
1666
1667 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1668 break;
1669
1670 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1671 msleep(10);
1672 spin_lock_irqsave(hostdata->host->host_lock, flags);
1673 } while (time_before(jiffies, wait_switch));
1674
1675 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1676
1677 if (rsp_rc != 0) {
1678 sdev_printk(KERN_ERR, cmd->device,
1679 "failed to send reset event. rc=%d\n", rsp_rc);
1680 return FAILED;
1681 }
1682
1683 sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n",
1684 (((u64) lun) << 48));
1685
1686 wait_for_completion(&evt->comp);
1687
1688
1689 if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1690 if (printk_ratelimit())
1691 sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
1692 srp_rsp.srp.rsp.opcode);
1693 return FAILED;
1694 }
1695
1696 if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1697 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1698 else
1699 rsp_rc = srp_rsp.srp.rsp.status;
1700
1701 if (rsp_rc) {
1702 if (printk_ratelimit())
1703 sdev_printk(KERN_WARNING, cmd->device,
1704 "reset code %d for task tag 0x%llx\n",
1705 rsp_rc, tsk_mgmt->task_tag);
1706 return FAILED;
1707 }
1708
1709
1710
1711
1712 spin_lock_irqsave(hostdata->host->host_lock, flags);
1713 list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1714 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1715 if (tmp_evt->cmnd)
1716 tmp_evt->cmnd->result = (DID_RESET << 16);
1717 list_del(&tmp_evt->list);
1718 unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
1719 tmp_evt->hostdata->dev);
1720 free_event_struct(&tmp_evt->hostdata->pool,
1721 tmp_evt);
1722 atomic_inc(&hostdata->request_limit);
1723 if (tmp_evt->cmnd_done)
1724 tmp_evt->cmnd_done(tmp_evt->cmnd);
1725 else if (tmp_evt->done)
1726 tmp_evt->done(tmp_evt);
1727 }
1728 }
1729 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1730 return SUCCESS;
1731}
1732
1733
1734
1735
1736
1737static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
1738{
1739 unsigned long wait_switch = 0;
1740 struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1741
1742 dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
1743
1744 ibmvscsi_reset_host(hostdata);
1745
1746 for (wait_switch = jiffies + (init_timeout * HZ);
1747 time_before(jiffies, wait_switch) &&
1748 atomic_read(&hostdata->request_limit) < 2;) {
1749
1750 msleep(10);
1751 }
1752
1753 if (atomic_read(&hostdata->request_limit) <= 0)
1754 return FAILED;
1755
1756 return SUCCESS;
1757}
1758
1759
1760
1761
1762
1763
1764
1765static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1766 struct ibmvscsi_host_data *hostdata)
1767{
1768 long rc;
1769 unsigned long flags;
1770
1771 struct srp_event_struct *evt_struct =
1772 (__force struct srp_event_struct *)crq->IU_data_ptr;
1773 switch (crq->valid) {
1774 case VIOSRP_CRQ_INIT_RSP:
1775 switch (crq->format) {
1776 case VIOSRP_CRQ_INIT:
1777 dev_info(hostdata->dev, "partner initialized\n");
1778
1779 rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0);
1780 if (rc == 0) {
1781
1782 init_adapter(hostdata);
1783 } else {
1784 dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
1785 }
1786
1787 break;
1788 case VIOSRP_CRQ_INIT_COMPLETE:
1789 dev_info(hostdata->dev, "partner initialization complete\n");
1790
1791
1792 init_adapter(hostdata);
1793 break;
1794 default:
1795 dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
1796 }
1797 return;
1798 case VIOSRP_CRQ_XPORT_EVENT:
1799 scsi_block_requests(hostdata->host);
1800 ibmvscsi_set_request_limit(hostdata, 0);
1801 if (crq->format == 0x06) {
1802
1803 dev_info(hostdata->dev, "Re-enabling adapter!\n");
1804 hostdata->client_migrated = 1;
1805 hostdata->action = IBMVSCSI_HOST_ACTION_REENABLE;
1806 purge_requests(hostdata, DID_REQUEUE);
1807 wake_up(&hostdata->work_wait_q);
1808 } else {
1809 dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",
1810 crq->format);
1811 ibmvscsi_reset_host(hostdata);
1812 }
1813 return;
1814 case VIOSRP_CRQ_CMD_RSP:
1815 break;
1816 default:
1817 dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
1818 crq->valid);
1819 return;
1820 }
1821
1822
1823
1824
1825
1826 if (!valid_event_struct(&hostdata->pool, evt_struct)) {
1827 dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
1828 evt_struct);
1829 return;
1830 }
1831
1832 if (atomic_read(&evt_struct->free)) {
1833 dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
1834 evt_struct);
1835 return;
1836 }
1837
1838 if (crq->format == VIOSRP_SRP_FORMAT)
1839 atomic_add(be32_to_cpu(evt_struct->xfer_iu->srp.rsp.req_lim_delta),
1840 &hostdata->request_limit);
1841
1842 del_timer(&evt_struct->timer);
1843
1844 if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd)
1845 evt_struct->cmnd->result = DID_ERROR << 16;
1846 if (evt_struct->done)
1847 evt_struct->done(evt_struct);
1848 else
1849 dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
1850
1851
1852
1853
1854
1855 spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1856 list_del(&evt_struct->list);
1857 free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1858 spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1859}
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869static int ibmvscsi_slave_configure(struct scsi_device *sdev)
1870{
1871 struct Scsi_Host *shost = sdev->host;
1872 unsigned long lock_flags = 0;
1873
1874 spin_lock_irqsave(shost->host_lock, lock_flags);
1875 if (sdev->type == TYPE_DISK) {
1876 sdev->allow_restart = 1;
1877 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
1878 }
1879 spin_unlock_irqrestore(shost->host_lock, lock_flags);
1880 return 0;
1881}
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
1892{
1893 if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
1894 qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
1895 return scsi_change_queue_depth(sdev, qdepth);
1896}
1897
1898
1899
1900
1901static ssize_t show_host_vhost_loc(struct device *dev,
1902 struct device_attribute *attr, char *buf)
1903{
1904 struct Scsi_Host *shost = class_to_shost(dev);
1905 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1906 int len;
1907
1908 len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n",
1909 hostdata->caps.loc);
1910 return len;
1911}
1912
1913static struct device_attribute ibmvscsi_host_vhost_loc = {
1914 .attr = {
1915 .name = "vhost_loc",
1916 .mode = S_IRUGO,
1917 },
1918 .show = show_host_vhost_loc,
1919};
1920
1921static ssize_t show_host_vhost_name(struct device *dev,
1922 struct device_attribute *attr, char *buf)
1923{
1924 struct Scsi_Host *shost = class_to_shost(dev);
1925 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1926 int len;
1927
1928 len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n",
1929 hostdata->caps.name);
1930 return len;
1931}
1932
1933static struct device_attribute ibmvscsi_host_vhost_name = {
1934 .attr = {
1935 .name = "vhost_name",
1936 .mode = S_IRUGO,
1937 },
1938 .show = show_host_vhost_name,
1939};
1940
1941static ssize_t show_host_srp_version(struct device *dev,
1942 struct device_attribute *attr, char *buf)
1943{
1944 struct Scsi_Host *shost = class_to_shost(dev);
1945 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1946 int len;
1947
1948 len = snprintf(buf, PAGE_SIZE, "%s\n",
1949 hostdata->madapter_info.srp_version);
1950 return len;
1951}
1952
1953static struct device_attribute ibmvscsi_host_srp_version = {
1954 .attr = {
1955 .name = "srp_version",
1956 .mode = S_IRUGO,
1957 },
1958 .show = show_host_srp_version,
1959};
1960
1961static ssize_t show_host_partition_name(struct device *dev,
1962 struct device_attribute *attr,
1963 char *buf)
1964{
1965 struct Scsi_Host *shost = class_to_shost(dev);
1966 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1967 int len;
1968
1969 len = snprintf(buf, PAGE_SIZE, "%s\n",
1970 hostdata->madapter_info.partition_name);
1971 return len;
1972}
1973
1974static struct device_attribute ibmvscsi_host_partition_name = {
1975 .attr = {
1976 .name = "partition_name",
1977 .mode = S_IRUGO,
1978 },
1979 .show = show_host_partition_name,
1980};
1981
1982static ssize_t show_host_partition_number(struct device *dev,
1983 struct device_attribute *attr,
1984 char *buf)
1985{
1986 struct Scsi_Host *shost = class_to_shost(dev);
1987 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1988 int len;
1989
1990 len = snprintf(buf, PAGE_SIZE, "%d\n",
1991 be32_to_cpu(hostdata->madapter_info.partition_number));
1992 return len;
1993}
1994
1995static struct device_attribute ibmvscsi_host_partition_number = {
1996 .attr = {
1997 .name = "partition_number",
1998 .mode = S_IRUGO,
1999 },
2000 .show = show_host_partition_number,
2001};
2002
2003static ssize_t show_host_mad_version(struct device *dev,
2004 struct device_attribute *attr, char *buf)
2005{
2006 struct Scsi_Host *shost = class_to_shost(dev);
2007 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2008 int len;
2009
2010 len = snprintf(buf, PAGE_SIZE, "%d\n",
2011 be32_to_cpu(hostdata->madapter_info.mad_version));
2012 return len;
2013}
2014
2015static struct device_attribute ibmvscsi_host_mad_version = {
2016 .attr = {
2017 .name = "mad_version",
2018 .mode = S_IRUGO,
2019 },
2020 .show = show_host_mad_version,
2021};
2022
2023static ssize_t show_host_os_type(struct device *dev,
2024 struct device_attribute *attr, char *buf)
2025{
2026 struct Scsi_Host *shost = class_to_shost(dev);
2027 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2028 int len;
2029
2030 len = snprintf(buf, PAGE_SIZE, "%d\n",
2031 be32_to_cpu(hostdata->madapter_info.os_type));
2032 return len;
2033}
2034
2035static struct device_attribute ibmvscsi_host_os_type = {
2036 .attr = {
2037 .name = "os_type",
2038 .mode = S_IRUGO,
2039 },
2040 .show = show_host_os_type,
2041};
2042
2043static ssize_t show_host_config(struct device *dev,
2044 struct device_attribute *attr, char *buf)
2045{
2046 return 0;
2047}
2048
2049static struct device_attribute ibmvscsi_host_config = {
2050 .attr = {
2051 .name = "config",
2052 .mode = S_IRUGO,
2053 },
2054 .show = show_host_config,
2055};
2056
2057static int ibmvscsi_host_reset(struct Scsi_Host *shost, int reset_type)
2058{
2059 struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2060
2061 dev_info(hostdata->dev, "Initiating adapter reset!\n");
2062 ibmvscsi_reset_host(hostdata);
2063
2064 return 0;
2065}
2066
2067static struct device_attribute *ibmvscsi_attrs[] = {
2068 &ibmvscsi_host_vhost_loc,
2069 &ibmvscsi_host_vhost_name,
2070 &ibmvscsi_host_srp_version,
2071 &ibmvscsi_host_partition_name,
2072 &ibmvscsi_host_partition_number,
2073 &ibmvscsi_host_mad_version,
2074 &ibmvscsi_host_os_type,
2075 &ibmvscsi_host_config,
2076 NULL
2077};
2078
2079
2080
2081
2082static struct scsi_host_template driver_template = {
2083 .module = THIS_MODULE,
2084 .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
2085 .proc_name = "ibmvscsi",
2086 .queuecommand = ibmvscsi_queuecommand,
2087 .eh_timed_out = srp_timed_out,
2088 .eh_abort_handler = ibmvscsi_eh_abort_handler,
2089 .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
2090 .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
2091 .slave_configure = ibmvscsi_slave_configure,
2092 .change_queue_depth = ibmvscsi_change_queue_depth,
2093 .host_reset = ibmvscsi_host_reset,
2094 .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT,
2095 .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
2096 .this_id = -1,
2097 .sg_tablesize = SG_ALL,
2098 .shost_attrs = ibmvscsi_attrs,
2099};
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev)
2110{
2111
2112 unsigned long desired_io = max_events * sizeof(union viosrp_iu);
2113
2114
2115 desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 *
2116 IBMVSCSI_CMDS_PER_LUN_DEFAULT);
2117
2118 return desired_io;
2119}
2120
2121static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata)
2122{
2123 unsigned long flags;
2124 int rc;
2125 char *action = "reset";
2126
2127 spin_lock_irqsave(hostdata->host->host_lock, flags);
2128 switch (hostdata->action) {
2129 case IBMVSCSI_HOST_ACTION_UNBLOCK:
2130 rc = 0;
2131 break;
2132 case IBMVSCSI_HOST_ACTION_RESET:
2133 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
2134 rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
2135 spin_lock_irqsave(hostdata->host->host_lock, flags);
2136 if (!rc)
2137 rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
2138 vio_enable_interrupts(to_vio_dev(hostdata->dev));
2139 break;
2140 case IBMVSCSI_HOST_ACTION_REENABLE:
2141 action = "enable";
2142 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
2143 rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata);
2144 spin_lock_irqsave(hostdata->host->host_lock, flags);
2145 if (!rc)
2146 rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
2147 break;
2148 case IBMVSCSI_HOST_ACTION_NONE:
2149 default:
2150 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
2151 return;
2152 }
2153
2154 hostdata->action = IBMVSCSI_HOST_ACTION_NONE;
2155 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
2156
2157 if (rc) {
2158 ibmvscsi_set_request_limit(hostdata, -1);
2159 dev_err(hostdata->dev, "error after %s\n", action);
2160 }
2161
2162 scsi_unblock_requests(hostdata->host);
2163}
2164
2165static int __ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
2166{
2167 if (kthread_should_stop())
2168 return 1;
2169 switch (hostdata->action) {
2170 case IBMVSCSI_HOST_ACTION_NONE:
2171 return 0;
2172 case IBMVSCSI_HOST_ACTION_RESET:
2173 case IBMVSCSI_HOST_ACTION_REENABLE:
2174 case IBMVSCSI_HOST_ACTION_UNBLOCK:
2175 default:
2176 break;
2177 }
2178
2179 return 1;
2180}
2181
2182static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
2183{
2184 unsigned long flags;
2185 int rc;
2186
2187 spin_lock_irqsave(hostdata->host->host_lock, flags);
2188 rc = __ibmvscsi_work_to_do(hostdata);
2189 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
2190
2191 return rc;
2192}
2193
2194static int ibmvscsi_work(void *data)
2195{
2196 struct ibmvscsi_host_data *hostdata = data;
2197 int rc;
2198
2199 set_user_nice(current, MIN_NICE);
2200
2201 while (1) {
2202 rc = wait_event_interruptible(hostdata->work_wait_q,
2203 ibmvscsi_work_to_do(hostdata));
2204
2205 BUG_ON(rc);
2206
2207 if (kthread_should_stop())
2208 break;
2209
2210 ibmvscsi_do_work(hostdata);
2211 }
2212
2213 return 0;
2214}
2215
2216
2217
2218
2219static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
2220{
2221 struct ibmvscsi_host_data *hostdata;
2222 struct Scsi_Host *host;
2223 struct device *dev = &vdev->dev;
2224 struct srp_rport_identifiers ids;
2225 struct srp_rport *rport;
2226 unsigned long wait_switch = 0;
2227 int rc;
2228
2229 dev_set_drvdata(&vdev->dev, NULL);
2230
2231 host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
2232 if (!host) {
2233 dev_err(&vdev->dev, "couldn't allocate host data\n");
2234 goto scsi_host_alloc_failed;
2235 }
2236
2237 host->transportt = ibmvscsi_transport_template;
2238 hostdata = shost_priv(host);
2239 memset(hostdata, 0x00, sizeof(*hostdata));
2240 INIT_LIST_HEAD(&hostdata->sent);
2241 init_waitqueue_head(&hostdata->work_wait_q);
2242 hostdata->host = host;
2243 hostdata->dev = dev;
2244 ibmvscsi_set_request_limit(hostdata, -1);
2245 hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT;
2246
2247 if (map_persist_bufs(hostdata)) {
2248 dev_err(&vdev->dev, "couldn't map persistent buffers\n");
2249 goto persist_bufs_failed;
2250 }
2251
2252 hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d",
2253 "ibmvscsi", host->host_no);
2254
2255 if (IS_ERR(hostdata->work_thread)) {
2256 dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n",
2257 PTR_ERR(hostdata->work_thread));
2258 goto init_crq_failed;
2259 }
2260
2261 rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events);
2262 if (rc != 0 && rc != H_RESOURCE) {
2263 dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);
2264 goto kill_kthread;
2265 }
2266 if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) {
2267 dev_err(&vdev->dev, "couldn't initialize event pool\n");
2268 goto init_pool_failed;
2269 }
2270
2271 host->max_lun = IBMVSCSI_MAX_LUN;
2272 host->max_id = max_id;
2273 host->max_channel = max_channel;
2274 host->max_cmd_len = 16;
2275
2276 dev_info(dev,
2277 "Maximum ID: %d Maximum LUN: %llu Maximum Channel: %d\n",
2278 host->max_id, host->max_lun, host->max_channel);
2279
2280 if (scsi_add_host(hostdata->host, hostdata->dev))
2281 goto add_host_failed;
2282
2283
2284 memcpy(ids.port_id, hostdata->madapter_info.partition_name,
2285 sizeof(ids.port_id));
2286 ids.roles = SRP_RPORT_ROLE_TARGET;
2287 rport = srp_rport_add(host, &ids);
2288 if (IS_ERR(rport))
2289 goto add_srp_port_failed;
2290
2291
2292
2293
2294
2295 if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0
2296 || rc == H_RESOURCE) {
2297
2298
2299
2300
2301
2302
2303 for (wait_switch = jiffies + (init_timeout * HZ);
2304 time_before(jiffies, wait_switch) &&
2305 atomic_read(&hostdata->request_limit) < 2;) {
2306
2307 msleep(10);
2308 }
2309
2310
2311 if (atomic_read(&hostdata->request_limit) > 0)
2312 scsi_scan_host(host);
2313 }
2314
2315 dev_set_drvdata(&vdev->dev, hostdata);
2316 spin_lock(&ibmvscsi_driver_lock);
2317 list_add_tail(&hostdata->host_list, &ibmvscsi_head);
2318 spin_unlock(&ibmvscsi_driver_lock);
2319 return 0;
2320
2321 add_srp_port_failed:
2322 scsi_remove_host(hostdata->host);
2323 add_host_failed:
2324 release_event_pool(&hostdata->pool, hostdata);
2325 init_pool_failed:
2326 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events);
2327 kill_kthread:
2328 kthread_stop(hostdata->work_thread);
2329 init_crq_failed:
2330 unmap_persist_bufs(hostdata);
2331 persist_bufs_failed:
2332 scsi_host_put(host);
2333 scsi_host_alloc_failed:
2334 return -1;
2335}
2336
2337static void ibmvscsi_remove(struct vio_dev *vdev)
2338{
2339 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);
2340
2341 srp_remove_host(hostdata->host);
2342 scsi_remove_host(hostdata->host);
2343
2344 purge_requests(hostdata, DID_ERROR);
2345 release_event_pool(&hostdata->pool, hostdata);
2346
2347 ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
2348 max_events);
2349
2350 kthread_stop(hostdata->work_thread);
2351 unmap_persist_bufs(hostdata);
2352
2353 spin_lock(&ibmvscsi_driver_lock);
2354 list_del(&hostdata->host_list);
2355 spin_unlock(&ibmvscsi_driver_lock);
2356
2357 scsi_host_put(hostdata->host);
2358}
2359
2360
2361
2362
2363
2364
2365
2366
2367static int ibmvscsi_resume(struct device *dev)
2368{
2369 struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev);
2370 vio_disable_interrupts(to_vio_dev(hostdata->dev));
2371 tasklet_schedule(&hostdata->srp_task);
2372
2373 return 0;
2374}
2375
2376
2377
2378
2379
2380static const struct vio_device_id ibmvscsi_device_table[] = {
2381 {"vscsi", "IBM,v-scsi"},
2382 { "", "" }
2383};
2384MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
2385
2386static const struct dev_pm_ops ibmvscsi_pm_ops = {
2387 .resume = ibmvscsi_resume
2388};
2389
2390static struct vio_driver ibmvscsi_driver = {
2391 .id_table = ibmvscsi_device_table,
2392 .probe = ibmvscsi_probe,
2393 .remove = ibmvscsi_remove,
2394 .get_desired_dma = ibmvscsi_get_desired_dma,
2395 .name = "ibmvscsi",
2396 .pm = &ibmvscsi_pm_ops,
2397};
2398
2399static struct srp_function_template ibmvscsi_transport_functions = {
2400};
2401
2402static int __init ibmvscsi_module_init(void)
2403{
2404 int ret;
2405
2406
2407 driver_template.can_queue = max_requests;
2408 max_events = max_requests + 2;
2409
2410 if (!firmware_has_feature(FW_FEATURE_VIO))
2411 return -ENODEV;
2412
2413 ibmvscsi_transport_template =
2414 srp_attach_transport(&ibmvscsi_transport_functions);
2415 if (!ibmvscsi_transport_template)
2416 return -ENOMEM;
2417
2418 ret = vio_register_driver(&ibmvscsi_driver);
2419 if (ret)
2420 srp_release_transport(ibmvscsi_transport_template);
2421 return ret;
2422}
2423
2424static void __exit ibmvscsi_module_exit(void)
2425{
2426 vio_unregister_driver(&ibmvscsi_driver);
2427 srp_release_transport(ibmvscsi_transport_template);
2428}
2429
2430module_init(ibmvscsi_module_init);
2431module_exit(ibmvscsi_module_exit);
2432