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MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / drivers / scsi / ibmvscsi / ibmvstgt.c
blob2256babe047463fa04621efcf432b0affe80ff71
1 /*
2 * IBM eServer i/pSeries Virtual SCSI Target Driver
3 * Copyright (C) 2003-2005 Dave Boutcher (boutcher@us.ibm.com) IBM Corp.
4 * Santiago Leon (santil@us.ibm.com) IBM Corp.
5 * Linda Xie (lxie@us.ibm.com) IBM Corp.
6 *
7 * Copyright (C) 2005-2006 FUJITA Tomonori <tomof@acm.org>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
22 * USA
23 */
24 #include <linux/interrupt.h>
25 #include <linux/module.h>
26 #include <linux/slab.h>
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_host.h>
29 #include <scsi/scsi_transport_srp.h>
30 #include <scsi/scsi_tgt.h>
31 #include <scsi/libsrp.h>
32 #include <asm/hvcall.h>
33 #include <asm/iommu.h>
34 #include <asm/prom.h>
35 #include <asm/vio.h>
36
37 #include "ibmvscsi.h"
38
39 #define INITIAL_SRP_LIMIT 16
40 #define DEFAULT_MAX_SECTORS 256
41
42 #define TGT_NAME "ibmvstgt"
43
44 /*
45 * Hypervisor calls.
46 */
47 #define h_copy_rdma(l, sa, sb, da, db) \
48 plpar_hcall_norets(H_COPY_RDMA, l, sa, sb, da, db)
49 #define h_send_crq(ua, l, h) \
50 plpar_hcall_norets(H_SEND_CRQ, ua, l, h)
51 #define h_reg_crq(ua, tok, sz)\
52 plpar_hcall_norets(H_REG_CRQ, ua, tok, sz);
53 #define h_free_crq(ua) \
54 plpar_hcall_norets(H_FREE_CRQ, ua);
55
56 /* tmp - will replace with SCSI logging stuff */
57 #define eprintk(fmt, args...) \
58 do { \
59 printk("%s(%d) " fmt, __func__, __LINE__, ##args); \
60 } while (0)
61 /* #define dprintk eprintk */
62 #define dprintk(fmt, args...)
63
64 struct vio_port {
65 struct vio_dev *dma_dev;
66
67 struct crq_queue crq_queue;
68 struct work_struct crq_work;
69
70 unsigned long liobn;
71 unsigned long riobn;
72 struct srp_target *target;
73
74 struct srp_rport *rport;
75 };
76
77 static struct workqueue_struct *vtgtd;
78 static struct scsi_transport_template *ibmvstgt_transport_template;
79
80 /*
81 * These are fixed for the system and come from the Open Firmware device tree.
82 * We just store them here to save getting them every time.
83 */
84 static char system_id[64] = "";
85 static char partition_name[97] = "UNKNOWN";
86 static unsigned int partition_number = -1;
87
88 static struct vio_port *target_to_port(struct srp_target *target)
89 {
90 return (struct vio_port *) target->ldata;
91 }
92
93 static inline union viosrp_iu *vio_iu(struct iu_entry *iue)
94 {
95 return (union viosrp_iu *) (iue->sbuf->buf);
96 }
97
98 static int send_iu(struct iu_entry *iue, uint64_t length, uint8_t format)
99 {
100 struct srp_target *target = iue->target;
101 struct vio_port *vport = target_to_port(target);
102 long rc, rc1;
103 union {
104 struct viosrp_crq cooked;
105 uint64_t raw[2];
106 } crq;
107
108 /* First copy the SRP */
109 rc = h_copy_rdma(length, vport->liobn, iue->sbuf->dma,
110 vport->riobn, iue->remote_token);
111
112 if (rc)
113 eprintk("Error %ld transferring data\n", rc);
114
115 crq.cooked.valid = 0x80;
116 crq.cooked.format = format;
117 crq.cooked.reserved = 0x00;
118 crq.cooked.timeout = 0x00;
119 crq.cooked.IU_length = length;
120 crq.cooked.IU_data_ptr = vio_iu(iue)->srp.rsp.tag;
121
122 if (rc == 0)
123 crq.cooked.status = 0x99; /* Just needs to be non-zero */
124 else
125 crq.cooked.status = 0x00;
126
127 rc1 = h_send_crq(vport->dma_dev->unit_address, crq.raw[0], crq.raw[1]);
128
129 if (rc1) {
130 eprintk("%ld sending response\n", rc1);
131 return rc1;
132 }
133
134 return rc;
135 }
136
137 #define SRP_RSP_SENSE_DATA_LEN 18
138
139 static int send_rsp(struct iu_entry *iue, struct scsi_cmnd *sc,
140 unsigned char status, unsigned char asc)
141 {
142 union viosrp_iu *iu = vio_iu(iue);
143 uint64_t tag = iu->srp.rsp.tag;
144
145 /* If the linked bit is on and status is good */
146 if (test_bit(V_LINKED, &iue->flags) && (status == NO_SENSE))
147 status = 0x10;
148
149 memset(iu, 0, sizeof(struct srp_rsp));
150 iu->srp.rsp.opcode = SRP_RSP;
151 iu->srp.rsp.req_lim_delta = 1;
152 iu->srp.rsp.tag = tag;
153
154 if (test_bit(V_DIOVER, &iue->flags))
155 iu->srp.rsp.flags |= SRP_RSP_FLAG_DIOVER;
156
157 iu->srp.rsp.data_in_res_cnt = 0;
158 iu->srp.rsp.data_out_res_cnt = 0;
159
160 iu->srp.rsp.flags &= ~SRP_RSP_FLAG_RSPVALID;
161
162 iu->srp.rsp.resp_data_len = 0;
163 iu->srp.rsp.status = status;
164 if (status) {
165 uint8_t *sense = iu->srp.rsp.data;
166
167 if (sc) {
168 iu->srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID;
169 iu->srp.rsp.sense_data_len = SCSI_SENSE_BUFFERSIZE;
170 memcpy(sense, sc->sense_buffer, SCSI_SENSE_BUFFERSIZE);
171 } else {
172 iu->srp.rsp.status = SAM_STAT_CHECK_CONDITION;
173 iu->srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID;
174 iu->srp.rsp.sense_data_len = SRP_RSP_SENSE_DATA_LEN;
175
176 /* Valid bit and 'current errors' */
177 sense[0] = (0x1 << 7 | 0x70);
178 /* Sense key */
179 sense[2] = status;
180 /* Additional sense length */
181 sense[7] = 0xa; /* 10 bytes */
182 /* Additional sense code */
183 sense[12] = asc;
184 }
185 }
186
187 send_iu(iue, sizeof(iu->srp.rsp) + SRP_RSP_SENSE_DATA_LEN,
188 VIOSRP_SRP_FORMAT);
189
190 return 0;
191 }
192
193 static void handle_cmd_queue(struct srp_target *target)
194 {
195 struct Scsi_Host *shost = target->shost;
196 struct srp_rport *rport = target_to_port(target)->rport;
197 struct iu_entry *iue;
198 struct srp_cmd *cmd;
199 unsigned long flags;
200 int err;
201
202 retry:
203 spin_lock_irqsave(&target->lock, flags);
204
205 list_for_each_entry(iue, &target->cmd_queue, ilist) {
206 if (!test_and_set_bit(V_FLYING, &iue->flags)) {
207 spin_unlock_irqrestore(&target->lock, flags);
208 cmd = iue->sbuf->buf;
209 err = srp_cmd_queue(shost, cmd, iue,
210 (unsigned long)rport, 0);
211 if (err) {
212 eprintk("cannot queue cmd %p %d\n", cmd, err);
213 srp_iu_put(iue);
214 }
215 goto retry;
216 }
217 }
218
219 spin_unlock_irqrestore(&target->lock, flags);
220 }
221
222 static int ibmvstgt_rdma(struct scsi_cmnd *sc, struct scatterlist *sg, int nsg,
223 struct srp_direct_buf *md, int nmd,
224 enum dma_data_direction dir, unsigned int rest)
225 {
226 struct iu_entry *iue = (struct iu_entry *) sc->SCp.ptr;
227 struct srp_target *target = iue->target;
228 struct vio_port *vport = target_to_port(target);
229 dma_addr_t token;
230 long err;
231 unsigned int done = 0;
232 int i, sidx, soff;
233
234 sidx = soff = 0;
235 token = sg_dma_address(sg + sidx);
236
237 for (i = 0; i < nmd && rest; i++) {
238 unsigned int mdone, mlen;
239
240 mlen = min(rest, md[i].len);
241 for (mdone = 0; mlen;) {
242 int slen = min(sg_dma_len(sg + sidx) - soff, mlen);
243
244 if (dir == DMA_TO_DEVICE)
245 err = h_copy_rdma(slen,
246 vport->riobn,
247 md[i].va + mdone,
248 vport->liobn,
249 token + soff);
250 else
251 err = h_copy_rdma(slen,
252 vport->liobn,
253 token + soff,
254 vport->riobn,
255 md[i].va + mdone);
256
257 if (err != H_SUCCESS) {
258 eprintk("rdma error %d %d %ld\n", dir, slen, err);
259 return -EIO;
260 }
261
262 mlen -= slen;
263 mdone += slen;
264 soff += slen;
265 done += slen;
266
267 if (soff == sg_dma_len(sg + sidx)) {
268 sidx++;
269 soff = 0;
270 token = sg_dma_address(sg + sidx);
271
272 if (sidx > nsg) {
273 eprintk("out of sg %p %d %d\n",
274 iue, sidx, nsg);
275 return -EIO;
276 }
277 }
278 };
279
280 rest -= mlen;
281 }
282 return 0;
283 }
284
285 static int ibmvstgt_cmd_done(struct scsi_cmnd *sc,
286 void (*done)(struct scsi_cmnd *))
287 {
288 unsigned long flags;
289 struct iu_entry *iue = (struct iu_entry *) sc->SCp.ptr;
290 struct srp_target *target = iue->target;
291 int err = 0;
292
293 dprintk("%p %p %x %u\n", iue, target, vio_iu(iue)->srp.cmd.cdb[0],
294 scsi_sg_count(sc));
295
296 if (scsi_sg_count(sc))
297 err = srp_transfer_data(sc, &vio_iu(iue)->srp.cmd, ibmvstgt_rdma, 1, 1);
298
299 spin_lock_irqsave(&target->lock, flags);
300 list_del(&iue->ilist);
301 spin_unlock_irqrestore(&target->lock, flags);
302
303 if (err|| sc->result != SAM_STAT_GOOD) {
304 eprintk("operation failed %p %d %x\n",
305 iue, sc->result, vio_iu(iue)->srp.cmd.cdb[0]);
306 send_rsp(iue, sc, HARDWARE_ERROR, 0x00);
307 } else
308 send_rsp(iue, sc, NO_SENSE, 0x00);
309
310 done(sc);
311 srp_iu_put(iue);
312 return 0;
313 }
314
315 int send_adapter_info(struct iu_entry *iue,
316 dma_addr_t remote_buffer, uint16_t length)
317 {
318 struct srp_target *target = iue->target;
319 struct vio_port *vport = target_to_port(target);
320 struct Scsi_Host *shost = target->shost;
321 dma_addr_t data_token;
322 struct mad_adapter_info_data *info;
323 int err;
324
325 info = dma_alloc_coherent(target->dev, sizeof(*info), &data_token,
326 GFP_KERNEL);
327 if (!info) {
328 eprintk("bad dma_alloc_coherent %p\n", target);
329 return 1;
330 }
331
332 /* Get remote info */
333 err = h_copy_rdma(sizeof(*info), vport->riobn, remote_buffer,
334 vport->liobn, data_token);
335 if (err == H_SUCCESS) {
336 dprintk("Client connect: %s (%d)\n",
337 info->partition_name, info->partition_number);
338 }
339
340 memset(info, 0, sizeof(*info));
341
342 strcpy(info->srp_version, "16.a");
343 strncpy(info->partition_name, partition_name,
344 sizeof(info->partition_name));
345 info->partition_number = partition_number;
346 info->mad_version = 1;
347 info->os_type = 2;
348 info->port_max_txu[0] = shost->hostt->max_sectors << 9;
349
350 /* Send our info to remote */
351 err = h_copy_rdma(sizeof(*info), vport->liobn, data_token,
352 vport->riobn, remote_buffer);
353
354 dma_free_coherent(target->dev, sizeof(*info), info, data_token);
355
356 if (err != H_SUCCESS) {
357 eprintk("Error sending adapter info %d\n", err);
358 return 1;
359 }
360
361 return 0;
362 }
363
364 static void process_login(struct iu_entry *iue)
365 {
366 union viosrp_iu *iu = vio_iu(iue);
367 struct srp_login_rsp *rsp = &iu->srp.login_rsp;
368 uint64_t tag = iu->srp.rsp.tag;
369 struct Scsi_Host *shost = iue->target->shost;
370 struct srp_target *target = host_to_srp_target(shost);
371 struct vio_port *vport = target_to_port(target);
372 struct srp_rport_identifiers ids;
373
374 memset(&ids, 0, sizeof(ids));
375 sprintf(ids.port_id, "%x", vport->dma_dev->unit_address);
376 ids.roles = SRP_RPORT_ROLE_INITIATOR;
377 if (!vport->rport)
378 vport->rport = srp_rport_add(shost, &ids);
379
380 /* TODO handle case that requested size is wrong and
381 * buffer format is wrong
382 */
383 memset(iu, 0, sizeof(struct srp_login_rsp));
384 rsp->opcode = SRP_LOGIN_RSP;
385 rsp->req_lim_delta = INITIAL_SRP_LIMIT;
386 rsp->tag = tag;
387 rsp->max_it_iu_len = sizeof(union srp_iu);
388 rsp->max_ti_iu_len = sizeof(union srp_iu);
389 /* direct and indirect */
390 rsp->buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT;
391
392 send_iu(iue, sizeof(*rsp), VIOSRP_SRP_FORMAT);
393 }
394
395 static inline void queue_cmd(struct iu_entry *iue)
396 {
397 struct srp_target *target = iue->target;
398 unsigned long flags;
399
400 spin_lock_irqsave(&target->lock, flags);
401 list_add_tail(&iue->ilist, &target->cmd_queue);
402 spin_unlock_irqrestore(&target->lock, flags);
403 }
404
405 static int process_tsk_mgmt(struct iu_entry *iue)
406 {
407 union viosrp_iu *iu = vio_iu(iue);
408 int fn;
409
410 dprintk("%p %u\n", iue, iu->srp.tsk_mgmt.tsk_mgmt_func);
411
412 switch (iu->srp.tsk_mgmt.tsk_mgmt_func) {
413 case SRP_TSK_ABORT_TASK:
414 fn = ABORT_TASK;
415 break;
416 case SRP_TSK_ABORT_TASK_SET:
417 fn = ABORT_TASK_SET;
418 break;
419 case SRP_TSK_CLEAR_TASK_SET:
420 fn = CLEAR_TASK_SET;
421 break;
422 case SRP_TSK_LUN_RESET:
423 fn = LOGICAL_UNIT_RESET;
424 break;
425 case SRP_TSK_CLEAR_ACA:
426 fn = CLEAR_ACA;
427 break;
428 default:
429 fn = 0;
430 }
431 if (fn)
432 scsi_tgt_tsk_mgmt_request(iue->target->shost,
433 (unsigned long)iue->target->shost,
434 fn,
435 iu->srp.tsk_mgmt.task_tag,
436 (struct scsi_lun *) &iu->srp.tsk_mgmt.lun,
437 iue);
438 else
439 send_rsp(iue, NULL, ILLEGAL_REQUEST, 0x20);
440
441 return !fn;
442 }
443
444 static int process_mad_iu(struct iu_entry *iue)
445 {
446 union viosrp_iu *iu = vio_iu(iue);
447 struct viosrp_adapter_info *info;
448 struct viosrp_host_config *conf;
449
450 switch (iu->mad.empty_iu.common.type) {
451 case VIOSRP_EMPTY_IU_TYPE:
452 eprintk("%s\n", "Unsupported EMPTY MAD IU");
453 break;
454 case VIOSRP_ERROR_LOG_TYPE:
455 eprintk("%s\n", "Unsupported ERROR LOG MAD IU");
456 iu->mad.error_log.common.status = 1;
457 send_iu(iue, sizeof(iu->mad.error_log), VIOSRP_MAD_FORMAT);
458 break;
459 case VIOSRP_ADAPTER_INFO_TYPE:
460 info = &iu->mad.adapter_info;
461 info->common.status = send_adapter_info(iue, info->buffer,
462 info->common.length);
463 send_iu(iue, sizeof(*info), VIOSRP_MAD_FORMAT);
464 break;
465 case VIOSRP_HOST_CONFIG_TYPE:
466 conf = &iu->mad.host_config;
467 conf->common.status = 1;
468 send_iu(iue, sizeof(*conf), VIOSRP_MAD_FORMAT);
469 break;
470 default:
471 eprintk("Unknown type %u\n", iu->srp.rsp.opcode);
472 }
473
474 return 1;
475 }
476
477 static int process_srp_iu(struct iu_entry *iue)
478 {
479 union viosrp_iu *iu = vio_iu(iue);
480 int done = 1;
481 u8 opcode = iu->srp.rsp.opcode;
482
483 switch (opcode) {
484 case SRP_LOGIN_REQ:
485 process_login(iue);
486 break;
487 case SRP_TSK_MGMT:
488 done = process_tsk_mgmt(iue);
489 break;
490 case SRP_CMD:
491 queue_cmd(iue);
492 done = 0;
493 break;
494 case SRP_LOGIN_RSP:
495 case SRP_I_LOGOUT:
496 case SRP_T_LOGOUT:
497 case SRP_RSP:
498 case SRP_CRED_REQ:
499 case SRP_CRED_RSP:
500 case SRP_AER_REQ:
501 case SRP_AER_RSP:
502 eprintk("Unsupported type %u\n", opcode);
503 break;
504 default:
505 eprintk("Unknown type %u\n", opcode);
506 }
507
508 return done;
509 }
510
511 static void process_iu(struct viosrp_crq *crq, struct srp_target *target)
512 {
513 struct vio_port *vport = target_to_port(target);
514 struct iu_entry *iue;
515 long err;
516 int done = 1;
517
518 iue = srp_iu_get(target);
519 if (!iue) {
520 eprintk("Error getting IU from pool, %p\n", target);
521 return;
522 }
523
524 iue->remote_token = crq->IU_data_ptr;
525
526 err = h_copy_rdma(crq->IU_length, vport->riobn,
527 iue->remote_token, vport->liobn, iue->sbuf->dma);
528
529 if (err != H_SUCCESS) {
530 eprintk("%ld transferring data error %p\n", err, iue);
531 goto out;
532 }
533
534 if (crq->format == VIOSRP_MAD_FORMAT)
535 done = process_mad_iu(iue);
536 else
537 done = process_srp_iu(iue);
538 out:
539 if (done)
540 srp_iu_put(iue);
541 }
542
543 static irqreturn_t ibmvstgt_interrupt(int dummy, void *data)
544 {
545 struct srp_target *target = data;
546 struct vio_port *vport = target_to_port(target);
547
548 vio_disable_interrupts(vport->dma_dev);
549 queue_work(vtgtd, &vport->crq_work);
550
551 return IRQ_HANDLED;
552 }
553
554 static int crq_queue_create(struct crq_queue *queue, struct srp_target *target)
555 {
556 int err;
557 struct vio_port *vport = target_to_port(target);
558
559 queue->msgs = (struct viosrp_crq *) get_zeroed_page(GFP_KERNEL);
560 if (!queue->msgs)
561 goto malloc_failed;
562 queue->size = PAGE_SIZE / sizeof(*queue->msgs);
563
564 queue->msg_token = dma_map_single(target->dev, queue->msgs,
565 queue->size * sizeof(*queue->msgs),
566 DMA_BIDIRECTIONAL);
567
568 if (dma_mapping_error(target->dev, queue->msg_token))
569 goto map_failed;
570
571 err = h_reg_crq(vport->dma_dev->unit_address, queue->msg_token,
572 PAGE_SIZE);
573
574 /* If the adapter was left active for some reason (like kexec)
575 * try freeing and re-registering
576 */
577 if (err == H_RESOURCE) {
578 do {
579 err = h_free_crq(vport->dma_dev->unit_address);
580 } while (err == H_BUSY || H_IS_LONG_BUSY(err));
581
582 err = h_reg_crq(vport->dma_dev->unit_address, queue->msg_token,
583 PAGE_SIZE);
584 }
585
586 if (err != H_SUCCESS && err != 2) {
587 eprintk("Error 0x%x opening virtual adapter\n", err);
588 goto reg_crq_failed;
589 }
590
591 err = request_irq(vport->dma_dev->irq, &ibmvstgt_interrupt,
592 IRQF_DISABLED, "ibmvstgt", target);
593 if (err)
594 goto req_irq_failed;
595
596 vio_enable_interrupts(vport->dma_dev);
597
598 h_send_crq(vport->dma_dev->unit_address, 0xC001000000000000, 0);
599
600 queue->cur = 0;
601 spin_lock_init(&queue->lock);
602
603 return 0;
604
605 req_irq_failed:
606 do {
607 err = h_free_crq(vport->dma_dev->unit_address);
608 } while (err == H_BUSY || H_IS_LONG_BUSY(err));
609
610 reg_crq_failed:
611 dma_unmap_single(target->dev, queue->msg_token,
612 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
613 map_failed:
614 free_page((unsigned long) queue->msgs);
615
616 malloc_failed:
617 return -ENOMEM;
618 }
619
620 static void crq_queue_destroy(struct srp_target *target)
621 {
622 struct vio_port *vport = target_to_port(target);
623 struct crq_queue *queue = &vport->crq_queue;
624 int err;
625
626 free_irq(vport->dma_dev->irq, target);
627 do {
628 err = h_free_crq(vport->dma_dev->unit_address);
629 } while (err == H_BUSY || H_IS_LONG_BUSY(err));
630
631 dma_unmap_single(target->dev, queue->msg_token,
632 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
633
634 free_page((unsigned long) queue->msgs);
635 }
636
637 static void process_crq(struct viosrp_crq *crq, struct srp_target *target)
638 {
639 struct vio_port *vport = target_to_port(target);
640 dprintk("%x %x\n", crq->valid, crq->format);
641
642 switch (crq->valid) {
643 case 0xC0:
644 /* initialization */
645 switch (crq->format) {
646 case 0x01:
647 h_send_crq(vport->dma_dev->unit_address,
648 0xC002000000000000, 0);
649 break;
650 case 0x02:
651 break;
652 default:
653 eprintk("Unknown format %u\n", crq->format);
654 }
655 break;
656 case 0xFF:
657 /* transport event */
658 break;
659 case 0x80:
660 /* real payload */
661 switch (crq->format) {
662 case VIOSRP_SRP_FORMAT:
663 case VIOSRP_MAD_FORMAT:
664 process_iu(crq, target);
665 break;
666 case VIOSRP_OS400_FORMAT:
667 case VIOSRP_AIX_FORMAT:
668 case VIOSRP_LINUX_FORMAT:
669 case VIOSRP_INLINE_FORMAT:
670 eprintk("Unsupported format %u\n", crq->format);
671 break;
672 default:
673 eprintk("Unknown format %u\n", crq->format);
674 }
675 break;
676 default:
677 eprintk("unknown message type 0x%02x!?\n", crq->valid);
678 }
679 }
680
681 static inline struct viosrp_crq *next_crq(struct crq_queue *queue)
682 {
683 struct viosrp_crq *crq;
684 unsigned long flags;
685
686 spin_lock_irqsave(&queue->lock, flags);
687 crq = &queue->msgs[queue->cur];
688 if (crq->valid & 0x80) {
689 if (++queue->cur == queue->size)
690 queue->cur = 0;
691 } else
692 crq = NULL;
693 spin_unlock_irqrestore(&queue->lock, flags);
694
695 return crq;
696 }
697
698 static void handle_crq(struct work_struct *work)
699 {
700 struct vio_port *vport = container_of(work, struct vio_port, crq_work);
701 struct srp_target *target = vport->target;
702 struct viosrp_crq *crq;
703 int done = 0;
704
705 while (!done) {
706 while ((crq = next_crq(&vport->crq_queue)) != NULL) {
707 process_crq(crq, target);
708 crq->valid = 0x00;
709 }
710
711 vio_enable_interrupts(vport->dma_dev);
712
713 crq = next_crq(&vport->crq_queue);
714 if (crq) {
715 vio_disable_interrupts(vport->dma_dev);
716 process_crq(crq, target);
717 crq->valid = 0x00;
718 } else
719 done = 1;
720 }
721
722 handle_cmd_queue(target);
723 }
724
725
726 static int ibmvstgt_eh_abort_handler(struct scsi_cmnd *sc)
727 {
728 unsigned long flags;
729 struct iu_entry *iue = (struct iu_entry *) sc->SCp.ptr;
730 struct srp_target *target = iue->target;
731
732 dprintk("%p %p %x\n", iue, target, vio_iu(iue)->srp.cmd.cdb[0]);
733
734 spin_lock_irqsave(&target->lock, flags);
735 list_del(&iue->ilist);
736 spin_unlock_irqrestore(&target->lock, flags);
737
738 srp_iu_put(iue);
739
740 return 0;
741 }
742
743 static int ibmvstgt_tsk_mgmt_response(struct Scsi_Host *shost,
744 u64 itn_id, u64 mid, int result)
745 {
746 struct iu_entry *iue = (struct iu_entry *) ((void *) mid);
747 union viosrp_iu *iu = vio_iu(iue);
748 unsigned char status, asc;
749
750 eprintk("%p %d\n", iue, result);
751 status = NO_SENSE;
752 asc = 0;
753
754 switch (iu->srp.tsk_mgmt.tsk_mgmt_func) {
755 case SRP_TSK_ABORT_TASK:
756 asc = 0x14;
757 if (result)
758 status = ABORTED_COMMAND;
759 break;
760 default:
761 break;
762 }
763
764 send_rsp(iue, NULL, status, asc);
765 srp_iu_put(iue);
766
767 return 0;
768 }
769
770 static int ibmvstgt_it_nexus_response(struct Scsi_Host *shost, u64 itn_id,
771 int result)
772 {
773 struct srp_target *target = host_to_srp_target(shost);
774 struct vio_port *vport = target_to_port(target);
775
776 if (result) {
777 eprintk("%p %d\n", shost, result);
778 srp_rport_del(vport->rport);
779 vport->rport = NULL;
780 }
781 return 0;
782 }
783
784 static ssize_t system_id_show(struct device *dev,
785 struct device_attribute *attr, char *buf)
786 {
787 return snprintf(buf, PAGE_SIZE, "%s\n", system_id);
788 }
789
790 static ssize_t partition_number_show(struct device *dev,
791 struct device_attribute *attr, char *buf)
792 {
793 return snprintf(buf, PAGE_SIZE, "%x\n", partition_number);
794 }
795
796 static ssize_t unit_address_show(struct device *dev,
797 struct device_attribute *attr, char *buf)
798 {
799 struct Scsi_Host *shost = class_to_shost(dev);
800 struct srp_target *target = host_to_srp_target(shost);
801 struct vio_port *vport = target_to_port(target);
802 return snprintf(buf, PAGE_SIZE, "%x\n", vport->dma_dev->unit_address);
803 }
804
805 static DEVICE_ATTR(system_id, S_IRUGO, system_id_show, NULL);
806 static DEVICE_ATTR(partition_number, S_IRUGO, partition_number_show, NULL);
807 static DEVICE_ATTR(unit_address, S_IRUGO, unit_address_show, NULL);
808
809 static struct device_attribute *ibmvstgt_attrs[] = {
810 &dev_attr_system_id,
811 &dev_attr_partition_number,
812 &dev_attr_unit_address,
813 NULL,
814 };
815
816 static struct scsi_host_template ibmvstgt_sht = {
817 .name = TGT_NAME,
818 .module = THIS_MODULE,
819 .can_queue = INITIAL_SRP_LIMIT,
820 .sg_tablesize = SG_ALL,
821 .use_clustering = DISABLE_CLUSTERING,
822 .max_sectors = DEFAULT_MAX_SECTORS,
823 .transfer_response = ibmvstgt_cmd_done,
824 .eh_abort_handler = ibmvstgt_eh_abort_handler,
825 .shost_attrs = ibmvstgt_attrs,
826 .proc_name = TGT_NAME,
827 .supported_mode = MODE_TARGET,
828 };
829
830 static int ibmvstgt_probe(struct vio_dev *dev, const struct vio_device_id *id)
831 {
832 struct Scsi_Host *shost;
833 struct srp_target *target;
834 struct vio_port *vport;
835 unsigned int *dma, dma_size;
836 int err = -ENOMEM;
837
838 vport = kzalloc(sizeof(struct vio_port), GFP_KERNEL);
839 if (!vport)
840 return err;
841 shost = scsi_host_alloc(&ibmvstgt_sht, sizeof(struct srp_target));
842 if (!shost)
843 goto free_vport;
844 shost->transportt = ibmvstgt_transport_template;
845
846 target = host_to_srp_target(shost);
847 target->shost = shost;
848 vport->dma_dev = dev;
849 target->ldata = vport;
850 vport->target = target;
851 err = srp_target_alloc(target, &dev->dev, INITIAL_SRP_LIMIT,
852 SRP_MAX_IU_LEN);
853 if (err)
854 goto put_host;
855
856 dma = (unsigned int *) vio_get_attribute(dev, "ibm,my-dma-window",
857 &dma_size);
858 if (!dma || dma_size != 40) {
859 eprintk("Couldn't get window property %d\n", dma_size);
860 err = -EIO;
861 goto free_srp_target;
862 }
863 vport->liobn = dma[0];
864 vport->riobn = dma[5];
865
866 INIT_WORK(&vport->crq_work, handle_crq);
867
868 err = scsi_add_host(shost, target->dev);
869 if (err)
870 goto free_srp_target;
871
872 err = scsi_tgt_alloc_queue(shost);
873 if (err)
874 goto remove_host;
875
876 err = crq_queue_create(&vport->crq_queue, target);
877 if (err)
878 goto free_queue;
879
880 return 0;
881 free_queue:
882 scsi_tgt_free_queue(shost);
883 remove_host:
884 scsi_remove_host(shost);
885 free_srp_target:
886 srp_target_free(target);
887 put_host:
888 scsi_host_put(shost);
889 free_vport:
890 kfree(vport);
891 return err;
892 }
893
894 static int ibmvstgt_remove(struct vio_dev *dev)
895 {
896 struct srp_target *target = dev_get_drvdata(&dev->dev);
897 struct Scsi_Host *shost = target->shost;
898 struct vio_port *vport = target->ldata;
899
900 crq_queue_destroy(target);
901 srp_remove_host(shost);
902 scsi_remove_host(shost);
903 scsi_tgt_free_queue(shost);
904 srp_target_free(target);
905 kfree(vport);
906 scsi_host_put(shost);
907 return 0;
908 }
909
910 static struct vio_device_id ibmvstgt_device_table[] __devinitdata = {
911 {"v-scsi-host", "IBM,v-scsi-host"},
912 {"",""}
913 };
914
915 MODULE_DEVICE_TABLE(vio, ibmvstgt_device_table);
916
917 static struct vio_driver ibmvstgt_driver = {
918 .id_table = ibmvstgt_device_table,
919 .probe = ibmvstgt_probe,
920 .remove = ibmvstgt_remove,
921 .driver = {
922 .name = "ibmvscsis",
923 .owner = THIS_MODULE,
924 }
925 };
926
927 static int get_system_info(void)
928 {
929 struct device_node *rootdn;
930 const char *id, *model, *name;
931 const unsigned int *num;
932
933 rootdn = of_find_node_by_path("/");
934 if (!rootdn)
935 return -ENOENT;
936
937 model = of_get_property(rootdn, "model", NULL);
938 id = of_get_property(rootdn, "system-id", NULL);
939 if (model && id)
940 snprintf(system_id, sizeof(system_id), "%s-%s", model, id);
941
942 name = of_get_property(rootdn, "ibm,partition-name", NULL);
943 if (name)
944 strncpy(partition_name, name, sizeof(partition_name));
945
946 num = of_get_property(rootdn, "ibm,partition-no", NULL);
947 if (num)
948 partition_number = *num;
949
950 of_node_put(rootdn);
951 return 0;
952 }
953
954 static struct srp_function_template ibmvstgt_transport_functions = {
955 .tsk_mgmt_response = ibmvstgt_tsk_mgmt_response,
956 .it_nexus_response = ibmvstgt_it_nexus_response,
957 };
958
959 static int __init ibmvstgt_init(void)
960 {
961 int err = -ENOMEM;
962
963 printk("IBM eServer i/pSeries Virtual SCSI Target Driver\n");
964
965 ibmvstgt_transport_template =
966 srp_attach_transport(&ibmvstgt_transport_functions);
967 if (!ibmvstgt_transport_template)
968 return err;
969
970 vtgtd = create_workqueue("ibmvtgtd");
971 if (!vtgtd)
972 goto release_transport;
973
974 err = get_system_info();
975 if (err)
976 goto destroy_wq;
977
978 err = vio_register_driver(&ibmvstgt_driver);
979 if (err)
980 goto destroy_wq;
981
982 return 0;
983 destroy_wq:
984 destroy_workqueue(vtgtd);
985 release_transport:
986 srp_release_transport(ibmvstgt_transport_template);
987 return err;
988 }
989
990 static void __exit ibmvstgt_exit(void)
991 {
992 printk("Unregister IBM virtual SCSI driver\n");
993
994 destroy_workqueue(vtgtd);
995 vio_unregister_driver(&ibmvstgt_driver);
996 srp_release_transport(ibmvstgt_transport_template);
997 }
998
999 MODULE_DESCRIPTION("IBM Virtual SCSI Target");
1000 MODULE_AUTHOR("Santiago Leon");
1001 MODULE_LICENSE("GPL");
1002
1003 module_init(ibmvstgt_init);
1004 module_exit(ibmvstgt_exit);
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