1 /*
2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License as published by the
4 * Free Software Foundation; either version 2, or (at your option) any
5 * later version.
6 *
7 * This program is distributed in the hope that it will be useful, but
8 * WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
10 * General Public License for more details.
11 *
12 * For the avoidance of doubt the "preferred form" of this code is one which
13 * is in an open non patent encumbered format. Where cryptographic key signing
14 * forms part of the process of creating an executable the information
15 * including keys needed to generate an equivalently functional executable
16 * are deemed to be part of the source code.
17 *
18 * Complications for I2O scsi
19 *
20 * o Each (bus,lun) is a logical device in I2O. We keep a map
21 * table. We spoof failed selection for unmapped units
22 * o Request sense buffers can come back for free.
23 * o Scatter gather is a bit dynamic. We have to investigate at
24 * setup time.
25 * o Some of our resources are dynamically shared. The i2o core
26 * needs a message reservation protocol to avoid swap v net
27 * deadlocking. We need to back off queue requests.
28 *
29 * In general the firmware wants to help. Where its help isn't performance
30 * useful we just ignore the aid. Its not worth the code in truth.
31 *
32 * Fixes/additions:
33 * Steve Ralston:
34 * Scatter gather now works
35 * Markus Lidel <Markus.Lidel@shadowconnect.com>:
36 * Minor fixes for 2.6.
37 *
38 * To Do:
39 * 64bit cleanups
40 * Fix the resource management problems.
41 */
42
43 #include <linux/module.h>
44 #include <linux/kernel.h>
45 #include <linux/types.h>
46 #include <linux/string.h>
47 #include <linux/ioport.h>
48 #include <linux/jiffies.h>
49 #include <linux/interrupt.h>
50 #include <linux/timer.h>
51 #include <linux/delay.h>
52 #include <linux/proc_fs.h>
53 #include <linux/prefetch.h>
54 #include <linux/pci.h>
55 #include <linux/blkdev.h>
56 #include <linux/i2o.h>
57 #include <linux/scatterlist.h>
58
59 #include <asm/dma.h>
60 #include <asm/system.h>
61 #include <asm/io.h>
62 #include <asm/atomic.h>
63
64 #include <scsi/scsi.h>
65 #include <scsi/scsi_host.h>
66 #include <scsi/scsi_device.h>
67 #include <scsi/scsi_cmnd.h>
68 #include <scsi/sg.h>
69
70 #define OSM_NAME "scsi-osm"
71 #define OSM_VERSION "1.316"
72 #define OSM_DESCRIPTION "I2O SCSI Peripheral OSM"
73
74 static struct i2o_driver i2o_scsi_driver;
75
76 static unsigned int i2o_scsi_max_id = 16;
77 static unsigned int i2o_scsi_max_lun = 255;
78
79 struct i2o_scsi_host {
80 struct Scsi_Host *scsi_host; /* pointer to the SCSI host */
81 struct i2o_controller *iop; /* pointer to the I2O controller */
82 unsigned int lun; /* lun's used for block devices */
83 struct i2o_device *channel[0]; /* channel->i2o_dev mapping table */
84 };
85
86 static struct scsi_host_template i2o_scsi_host_template;
87
88 #define I2O_SCSI_CAN_QUEUE 4
89
90 /* SCSI OSM class handling definition */
91 static struct i2o_class_id i2o_scsi_class_id[] = {
92 {I2O_CLASS_SCSI_PERIPHERAL},
93 {I2O_CLASS_END}
94 };
95
96 static struct i2o_scsi_host *i2o_scsi_host_alloc(struct i2o_controller *c)
97 {
98 struct i2o_scsi_host *i2o_shost;
99 struct i2o_device *i2o_dev;
100 struct Scsi_Host *scsi_host;
101 int max_channel = 0;
102 u8 type;
103 int i;
104 size_t size;
105 u16 body_size = 6;
106
107 #ifdef CONFIG_I2O_EXT_ADAPTEC
108 if (c->adaptec)
109 body_size = 8;
110 #endif
111
112 list_for_each_entry(i2o_dev, &c->devices, list)
113 if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER) {
114 if (!i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1)
115 && (type == 0x01)) /* SCSI bus */
116 max_channel++;
117 }
118
119 if (!max_channel) {
120 osm_warn("no channels found on %s\n", c->name);
121 return ERR_PTR(-EFAULT);
122 }
123
124 size = max_channel * sizeof(struct i2o_device *)
125 + sizeof(struct i2o_scsi_host);
126
127 scsi_host = scsi_host_alloc(&i2o_scsi_host_template, size);
128 if (!scsi_host) {
129 osm_warn("Could not allocate SCSI host\n");
130 return ERR_PTR(-ENOMEM);
131 }
132
133 scsi_host->max_channel = max_channel - 1;
134 scsi_host->max_id = i2o_scsi_max_id;
135 scsi_host->max_lun = i2o_scsi_max_lun;
136 scsi_host->this_id = c->unit;
137 scsi_host->sg_tablesize = i2o_sg_tablesize(c, body_size);
138
139 i2o_shost = (struct i2o_scsi_host *)scsi_host->hostdata;
140 i2o_shost->scsi_host = scsi_host;
141 i2o_shost->iop = c;
142 i2o_shost->lun = 1;
143
144 i = 0;
145 list_for_each_entry(i2o_dev, &c->devices, list)
146 if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER) {
147 if (!i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1)
148 && (type == 0x01)) /* only SCSI bus */
149 i2o_shost->channel[i++] = i2o_dev;
150
151 if (i >= max_channel)
152 break;
153 }
154
155 return i2o_shost;
156 };
157
158 /**
159 * i2o_scsi_get_host - Get an I2O SCSI host
160 * @c: I2O controller to for which to get the SCSI host
161 *
162 * If the I2O controller already exists as SCSI host, the SCSI host
163 * is returned, otherwise the I2O controller is added to the SCSI
164 * core.
165 *
166 * Returns pointer to the I2O SCSI host on success or NULL on failure.
167 */
168 static struct i2o_scsi_host *i2o_scsi_get_host(struct i2o_controller *c)
169 {
170 return c->driver_data[i2o_scsi_driver.context];
171 };
172
173 /**
174 * i2o_scsi_remove - Remove I2O device from SCSI core
175 * @dev: device which should be removed
176 *
177 * Removes the I2O device from the SCSI core again.
178 *
179 * Returns 0 on success.
180 */
181 static int i2o_scsi_remove(struct device *dev)
182 {
183 struct i2o_device *i2o_dev = to_i2o_device(dev);
184 struct i2o_controller *c = i2o_dev->iop;
185 struct i2o_scsi_host *i2o_shost;
186 struct scsi_device *scsi_dev;
187
188 osm_info("device removed (TID: %03x)\n", i2o_dev->lct_data.tid);
189
190 i2o_shost = i2o_scsi_get_host(c);
191
192 shost_for_each_device(scsi_dev, i2o_shost->scsi_host)
193 if (scsi_dev->hostdata == i2o_dev) {
194 sysfs_remove_link(&i2o_dev->device.kobj, "scsi");
195 scsi_remove_device(scsi_dev);
196 scsi_device_put(scsi_dev);
197 break;
198 }
199
200 return 0;
201 };
202
203 /**
204 * i2o_scsi_probe - verify if dev is a I2O SCSI device and install it
205 * @dev: device to verify if it is a I2O SCSI device
206 *
207 * Retrieve channel, id and lun for I2O device. If everthing goes well
208 * register the I2O device as SCSI device on the I2O SCSI controller.
209 *
210 * Returns 0 on success or negative error code on failure.
211 */
212 static int i2o_scsi_probe(struct device *dev)
213 {
214 struct i2o_device *i2o_dev = to_i2o_device(dev);
215 struct i2o_controller *c = i2o_dev->iop;
216 struct i2o_scsi_host *i2o_shost;
217 struct Scsi_Host *scsi_host;
218 struct i2o_device *parent;
219 struct scsi_device *scsi_dev;
220 u32 id = -1;
221 u64 lun = -1;
222 int channel = -1;
223 int i, rc;
224
225 i2o_shost = i2o_scsi_get_host(c);
226 if (!i2o_shost)
227 return -EFAULT;
228
229 scsi_host = i2o_shost->scsi_host;
230
231 switch (i2o_dev->lct_data.class_id) {
232 case I2O_CLASS_RANDOM_BLOCK_STORAGE:
233 case I2O_CLASS_EXECUTIVE:
234 #ifdef CONFIG_I2O_EXT_ADAPTEC
235 if (c->adaptec) {
236 u8 type;
237 struct i2o_device *d = i2o_shost->channel[0];
238
239 if (!i2o_parm_field_get(d, 0x0000, 0, &type, 1)
240 && (type == 0x01)) /* SCSI bus */
241 if (!i2o_parm_field_get(d, 0x0200, 4, &id, 4)) {
242 channel = 0;
243 if (i2o_dev->lct_data.class_id ==
244 I2O_CLASS_RANDOM_BLOCK_STORAGE)
245 lun =
246 cpu_to_le64(i2o_shost->
247 lun++);
248 else
249 lun = 0;
250 }
251 }
252 #endif
253 break;
254
255 case I2O_CLASS_SCSI_PERIPHERAL:
256 if (i2o_parm_field_get(i2o_dev, 0x0000, 3, &id, 4))
257 return -EFAULT;
258
259 if (i2o_parm_field_get(i2o_dev, 0x0000, 4, &lun, 8))
260 return -EFAULT;
261
262 parent = i2o_iop_find_device(c, i2o_dev->lct_data.parent_tid);
263 if (!parent) {
264 osm_warn("can not find parent of device %03x\n",
265 i2o_dev->lct_data.tid);
266 return -EFAULT;
267 }
268
269 for (i = 0; i <= i2o_shost->scsi_host->max_channel; i++)
270 if (i2o_shost->channel[i] == parent)
271 channel = i;
272 break;
273
274 default:
275 return -EFAULT;
276 }
277
278 if (channel == -1) {
279 osm_warn("can not find channel of device %03x\n",
280 i2o_dev->lct_data.tid);
281 return -EFAULT;
282 }
283
284 if (le32_to_cpu(id) >= scsi_host->max_id) {
285 osm_warn("SCSI device id (%d) >= max_id of I2O host (%d)",
286 le32_to_cpu(id), scsi_host->max_id);
287 return -EFAULT;
288 }
289
290 if (le64_to_cpu(lun) >= scsi_host->max_lun) {
291 osm_warn("SCSI device lun (%lu) >= max_lun of I2O host (%d)",
292 (long unsigned int)le64_to_cpu(lun),
293 scsi_host->max_lun);
294 return -EFAULT;
295 }
296
297 scsi_dev =
298 __scsi_add_device(i2o_shost->scsi_host, channel, le32_to_cpu(id),
299 le64_to_cpu(lun), i2o_dev);
300
301 if (IS_ERR(scsi_dev)) {
302 osm_warn("can not add SCSI device %03x\n",
303 i2o_dev->lct_data.tid);
304 return PTR_ERR(scsi_dev);
305 }
306
307 rc = sysfs_create_link(&i2o_dev->device.kobj,
308 &scsi_dev->sdev_gendev.kobj, "scsi");
309 if (rc)
310 goto err;
311
312 osm_info("device added (TID: %03x) channel: %d, id: %d, lun: %ld\n",
313 i2o_dev->lct_data.tid, channel, le32_to_cpu(id),
314 (long unsigned int)le64_to_cpu(lun));
315
316 return 0;
317
318 err:
319 scsi_remove_device(scsi_dev);
320 return rc;
321 };
322
323 static const char *i2o_scsi_info(struct Scsi_Host *SChost)
324 {
325 struct i2o_scsi_host *hostdata;
326 hostdata = (struct i2o_scsi_host *)SChost->hostdata;
327 return hostdata->iop->name;
328 }
329
330 /**
331 * i2o_scsi_reply - SCSI OSM message reply handler
332 * @c: controller issuing the reply
333 * @m: message id for flushing
334 * @msg: the message from the controller
335 *
336 * Process reply messages (interrupts in normal scsi controller think).
337 * We can get a variety of messages to process. The normal path is
338 * scsi command completions. We must also deal with IOP failures,
339 * the reply to a bus reset and the reply to a LUN query.
340 *
341 * Returns 0 on success and if the reply should not be flushed or > 0
342 * on success and if the reply should be flushed. Returns negative error
343 * code on failure and if the reply should be flushed.
344 */
345 static int i2o_scsi_reply(struct i2o_controller *c, u32 m,
346 struct i2o_message *msg)
347 {
348 struct scsi_cmnd *cmd;
349 u32 error;
350 struct device *dev;
351
352 cmd = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt));
353 if (unlikely(!cmd)) {
354 osm_err("NULL reply received!\n");
355 return -1;
356 }
357
358 /*
359 * Low byte is device status, next is adapter status,
360 * (then one byte reserved), then request status.
361 */
362 error = le32_to_cpu(msg->body[0]);
363
364 osm_debug("Completed %ld\n", cmd->serial_number);
365
366 cmd->result = error & 0xff;
367 /*
368 * if DeviceStatus is not SCSI_SUCCESS copy over the sense data and let
369 * the SCSI layer handle the error
370 */
371 if (cmd->result)
372 memcpy(cmd->sense_buffer, &msg->body[3],
373 min(SCSI_SENSE_BUFFERSIZE, 40));
374
375 /* only output error code if AdapterStatus is not HBA_SUCCESS */
376 if ((error >> 8) & 0xff)
377 osm_err("SCSI error %08x\n", error);
378
379 dev = &c->pdev->dev;
380
381 scsi_dma_unmap(cmd);
382
383 cmd->scsi_done(cmd);
384
385 return 1;
386 };
387
388 /**
389 * i2o_scsi_notify_device_add - Retrieve notifications of added devices
390 * @i2o_dev: the I2O device which was added
391 *
392 * If a I2O device is added we catch the notification, because I2O classes
393 * other than SCSI peripheral will not be received through
394 * i2o_scsi_probe().
395 */
396 static void i2o_scsi_notify_device_add(struct i2o_device *i2o_dev)
397 {
398 switch (i2o_dev->lct_data.class_id) {
399 case I2O_CLASS_EXECUTIVE:
400 case I2O_CLASS_RANDOM_BLOCK_STORAGE:
401 i2o_scsi_probe(&i2o_dev->device);
402 break;
403
404 default:
405 break;
406 }
407 };
408
409 /**
410 * i2o_scsi_notify_device_remove - Retrieve notifications of removed devices
411 * @i2o_dev: the I2O device which was removed
412 *
413 * If a I2O device is removed, we catch the notification to remove the
414 * corresponding SCSI device.
415 */
416 static void i2o_scsi_notify_device_remove(struct i2o_device *i2o_dev)
417 {
418 switch (i2o_dev->lct_data.class_id) {
419 case I2O_CLASS_EXECUTIVE:
420 case I2O_CLASS_RANDOM_BLOCK_STORAGE:
421 i2o_scsi_remove(&i2o_dev->device);
422 break;
423
424 default:
425 break;
426 }
427 };
428
429 /**
430 * i2o_scsi_notify_controller_add - Retrieve notifications of added controllers
431 * @c: the controller which was added
432 *
433 * If a I2O controller is added, we catch the notification to add a
434 * corresponding Scsi_Host.
435 */
436 static void i2o_scsi_notify_controller_add(struct i2o_controller *c)
437 {
438 struct i2o_scsi_host *i2o_shost;
439 int rc;
440
441 i2o_shost = i2o_scsi_host_alloc(c);
442 if (IS_ERR(i2o_shost)) {
443 osm_err("Could not initialize SCSI host\n");
444 return;
445 }
446
447 rc = scsi_add_host(i2o_shost->scsi_host, &c->device);
448 if (rc) {
449 osm_err("Could not add SCSI host\n");
450 scsi_host_put(i2o_shost->scsi_host);
451 return;
452 }
453
454 c->driver_data[i2o_scsi_driver.context] = i2o_shost;
455
456 osm_debug("new I2O SCSI host added\n");
457 };
458
459 /**
460 * i2o_scsi_notify_controller_remove - Retrieve notifications of removed controllers
461 * @c: the controller which was removed
462 *
463 * If a I2O controller is removed, we catch the notification to remove the
464 * corresponding Scsi_Host.
465 */
466 static void i2o_scsi_notify_controller_remove(struct i2o_controller *c)
467 {
468 struct i2o_scsi_host *i2o_shost;
469 i2o_shost = i2o_scsi_get_host(c);
470 if (!i2o_shost)
471 return;
472
473 c->driver_data[i2o_scsi_driver.context] = NULL;
474
475 scsi_remove_host(i2o_shost->scsi_host);
476 scsi_host_put(i2o_shost->scsi_host);
477 osm_debug("I2O SCSI host removed\n");
478 };
479
480 /* SCSI OSM driver struct */
481 static struct i2o_driver i2o_scsi_driver = {
482 .name = OSM_NAME,
483 .reply = i2o_scsi_reply,
484 .classes = i2o_scsi_class_id,
485 .notify_device_add = i2o_scsi_notify_device_add,
486 .notify_device_remove = i2o_scsi_notify_device_remove,
487 .notify_controller_add = i2o_scsi_notify_controller_add,
488 .notify_controller_remove = i2o_scsi_notify_controller_remove,
489 .driver = {
490 .probe = i2o_scsi_probe,
491 .remove = i2o_scsi_remove,
492 },
493 };
494
495 /**
496 * i2o_scsi_queuecommand - queue a SCSI command
497 * @SCpnt: scsi command pointer
498 * @done: callback for completion
499 *
500 * Issue a scsi command asynchronously. Return 0 on success or 1 if
501 * we hit an error (normally message queue congestion). The only
502 * minor complication here is that I2O deals with the device addressing
503 * so we have to map the bus/dev/lun back to an I2O handle as well
504 * as faking absent devices ourself.
505 *
506 * Locks: takes the controller lock on error path only
507 */
508
509 static int i2o_scsi_queuecommand(struct scsi_cmnd *SCpnt,
510 void (*done) (struct scsi_cmnd *))
511 {
512 struct i2o_controller *c;
513 struct i2o_device *i2o_dev;
514 int tid;
515 struct i2o_message *msg;
516 /*
517 * ENABLE_DISCONNECT
518 * SIMPLE_TAG
519 * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME
520 */
521 u32 scsi_flags = 0x20a00000;
522 u32 sgl_offset;
523 u32 *mptr;
524 u32 cmd = I2O_CMD_SCSI_EXEC << 24;
525 int rc = 0;
526
527 /*
528 * Do the incoming paperwork
529 */
530 i2o_dev = SCpnt->device->hostdata;
531 c = i2o_dev->iop;
532
533 SCpnt->scsi_done = done;
534
535 if (unlikely(!i2o_dev)) {
536 osm_warn("no I2O device in request\n");
537 SCpnt->result = DID_NO_CONNECT << 16;
538 done(SCpnt);
539 goto exit;
540 }
541
542 tid = i2o_dev->lct_data.tid;
543
544 osm_debug("qcmd: Tid = %03x\n", tid);
545 osm_debug("Real scsi messages.\n");
546
547 /*
548 * Put together a scsi execscb message
549 */
550 switch (SCpnt->sc_data_direction) {
551 case PCI_DMA_NONE:
552 /* DATA NO XFER */
553 sgl_offset = SGL_OFFSET_0;
554 break;
555
556 case PCI_DMA_TODEVICE:
557 /* DATA OUT (iop-->dev) */
558 scsi_flags |= 0x80000000;
559 sgl_offset = SGL_OFFSET_10;
560 break;
561
562 case PCI_DMA_FROMDEVICE:
563 /* DATA IN (iop<--dev) */
564 scsi_flags |= 0x40000000;
565 sgl_offset = SGL_OFFSET_10;
566 break;
567
568 default:
569 /* Unknown - kill the command */
570 SCpnt->result = DID_NO_CONNECT << 16;
571 done(SCpnt);
572 goto exit;
573 }
574
575 /*
576 * Obtain an I2O message. If there are none free then
577 * throw it back to the scsi layer
578 */
579
580 msg = i2o_msg_get(c);
581 if (IS_ERR(msg)) {
582 rc = SCSI_MLQUEUE_HOST_BUSY;
583 goto exit;
584 }
585
586 mptr = &msg->body[0];
587
588 #if 0 /* this code can't work */
589 #ifdef CONFIG_I2O_EXT_ADAPTEC
590 if (c->adaptec) {
591 u32 adpt_flags = 0;
592
593 if (SCpnt->sc_request && SCpnt->sc_request->upper_private_data) {
594 i2o_sg_io_hdr_t __user *usr_ptr =
595 ((Sg_request *) (SCpnt->sc_request->
596 upper_private_data))->header.
597 usr_ptr;
598
599 if (usr_ptr)
600 get_user(adpt_flags, &usr_ptr->flags);
601 }
602
603 switch (i2o_dev->lct_data.class_id) {
604 case I2O_CLASS_EXECUTIVE:
605 case I2O_CLASS_RANDOM_BLOCK_STORAGE:
606 /* interpret flag has to be set for executive */
607 adpt_flags ^= I2O_DPT_SG_FLAG_INTERPRET;
608 break;
609
610 default:
611 break;
612 }
613
614 /*
615 * for Adaptec controllers we use the PRIVATE command, because
616 * the normal SCSI EXEC doesn't support all SCSI commands on
617 * all controllers (for example READ CAPACITY).
618 */
619 if (sgl_offset == SGL_OFFSET_10)
620 sgl_offset = SGL_OFFSET_12;
621 cmd = I2O_CMD_PRIVATE << 24;
622 *mptr++ = cpu_to_le32(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC);
623 *mptr++ = cpu_to_le32(adpt_flags | tid);
624 }
625 #endif
626 #endif
627
628 msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid);
629 msg->u.s.icntxt = cpu_to_le32(i2o_scsi_driver.context);
630
631 /* We want the SCSI control block back */
632 msg->u.s.tcntxt = cpu_to_le32(i2o_cntxt_list_add(c, SCpnt));
633
634 /* LSI_920_PCI_QUIRK
635 *
636 * Intermittant observations of msg frame word data corruption
637 * observed on msg[4] after:
638 * WRITE, READ-MODIFY-WRITE
639 * operations. 19990606 -sralston
640 *
641 * (Hence we build this word via tag. Its good practice anyway
642 * we don't want fetches over PCI needlessly)
643 */
644
645 /* Attach tags to the devices */
646 /* FIXME: implement
647 if(SCpnt->device->tagged_supported) {
648 if(SCpnt->tag == HEAD_OF_QUEUE_TAG)
649 scsi_flags |= 0x01000000;
650 else if(SCpnt->tag == ORDERED_QUEUE_TAG)
651 scsi_flags |= 0x01800000;
652 }
653 */
654
655 *mptr++ = cpu_to_le32(scsi_flags | SCpnt->cmd_len);
656
657 /* Write SCSI command into the message - always 16 byte block */
658 memcpy(mptr, SCpnt->cmnd, 16);
659 mptr += 4;
660
661 if (sgl_offset != SGL_OFFSET_0) {
662 /* write size of data addressed by SGL */
663 *mptr++ = cpu_to_le32(scsi_bufflen(SCpnt));
664
665 /* Now fill in the SGList and command */
666
667 if (scsi_sg_count(SCpnt)) {
668 if (!i2o_dma_map_sg(c, scsi_sglist(SCpnt),
669 scsi_sg_count(SCpnt),
670 SCpnt->sc_data_direction, &mptr))
671 goto nomem;
672 }
673 }
674
675 /* Stick the headers on */
676 msg->u.head[0] =
677 cpu_to_le32(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset);
678
679 /* Queue the message */
680 i2o_msg_post(c, msg);
681
682 osm_debug("Issued %ld\n", SCpnt->serial_number);
683
684 return 0;
685
686 nomem:
687 rc = -ENOMEM;
688 i2o_msg_nop(c, msg);
689
690 exit:
691 return rc;
692 };
693
694 /**
695 * i2o_scsi_abort - abort a running command
696 * @SCpnt: command to abort
697 *
698 * Ask the I2O controller to abort a command. This is an asynchrnous
699 * process and our callback handler will see the command complete with an
700 * aborted message if it succeeds.
701 *
702 * Returns 0 if the command is successfully aborted or negative error code
703 * on failure.
704 */
705 static int i2o_scsi_abort(struct scsi_cmnd *SCpnt)
706 {
707 struct i2o_device *i2o_dev;
708 struct i2o_controller *c;
709 struct i2o_message *msg;
710 int tid;
711 int status = FAILED;
712
713 osm_warn("Aborting command block.\n");
714
715 i2o_dev = SCpnt->device->hostdata;
716 c = i2o_dev->iop;
717 tid = i2o_dev->lct_data.tid;
718
719 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
720 if (IS_ERR(msg))
721 return SCSI_MLQUEUE_HOST_BUSY;
722
723 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
724 msg->u.head[1] =
725 cpu_to_le32(I2O_CMD_SCSI_ABORT << 24 | HOST_TID << 12 | tid);
726 msg->body[0] = cpu_to_le32(i2o_cntxt_list_get_ptr(c, SCpnt));
727
728 if (!i2o_msg_post_wait(c, msg, I2O_TIMEOUT_SCSI_SCB_ABORT))
729 status = SUCCESS;
730
731 return status;
732 }
733
734 /**
735 * i2o_scsi_bios_param - Invent disk geometry
736 * @sdev: scsi device
737 * @dev: block layer device
738 * @capacity: size in sectors
739 * @ip: geometry array
740 *
741 * This is anyone's guess quite frankly. We use the same rules everyone
742 * else appears to and hope. It seems to work.
743 */
744
745 static int i2o_scsi_bios_param(struct scsi_device *sdev,
746 struct block_device *dev, sector_t capacity,
747 int *ip)
748 {
749 int size;
750
751 size = capacity;
752 ip[0] = 64; /* heads */
753 ip[1] = 32; /* sectors */
754 if ((ip[2] = size >> 11) > 1024) { /* cylinders, test for big disk */
755 ip[0] = 255; /* heads */
756 ip[1] = 63; /* sectors */
757 ip[2] = size / (255 * 63); /* cylinders */
758 }
759 return 0;
760 }
761
762 static struct scsi_host_template i2o_scsi_host_template = {
763 .proc_name = OSM_NAME,
764 .name = OSM_DESCRIPTION,
765 .info = i2o_scsi_info,
766 .queuecommand = i2o_scsi_queuecommand,
767 .eh_abort_handler = i2o_scsi_abort,
768 .bios_param = i2o_scsi_bios_param,
769 .can_queue = I2O_SCSI_CAN_QUEUE,
770 .sg_tablesize = 8,
771 .cmd_per_lun = 6,
772 .use_clustering = ENABLE_CLUSTERING,
773 };
774
775 /**
776 * i2o_scsi_init - SCSI OSM initialization function
777 *
778 * Register SCSI OSM into I2O core.
779 *
780 * Returns 0 on success or negative error code on failure.
781 */
782 static int __init i2o_scsi_init(void)
783 {
784 int rc;
785
786 printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
787
788 /* Register SCSI OSM into I2O core */
789 rc = i2o_driver_register(&i2o_scsi_driver);
790 if (rc) {
791 osm_err("Could not register SCSI driver\n");
792 return rc;
793 }
794
795 return 0;
796 };
797
798 /**
799 * i2o_scsi_exit - SCSI OSM exit function
800 *
801 * Unregisters SCSI OSM from I2O core.
802 */
803 static void __exit i2o_scsi_exit(void)
804 {
805 /* Unregister I2O SCSI OSM from I2O core */
806 i2o_driver_unregister(&i2o_scsi_driver);
807 };
808
809 MODULE_AUTHOR("Red Hat Software");
810 MODULE_LICENSE("GPL");
811 MODULE_DESCRIPTION(OSM_DESCRIPTION);
812 MODULE_VERSION(OSM_VERSION);
813
814 module_init(i2o_scsi_init);
815 module_exit(i2o_scsi_exit);
816
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