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/io.h>
61 #include <linux/atomic.h>
62
63 #include <scsi/scsi.h>
64 #include <scsi/scsi_host.h>
65 #include <scsi/scsi_device.h>
66 #include <scsi/scsi_cmnd.h>
67 #include <scsi/sg.h>
68
69 #define OSM_NAME "scsi-osm"
70 #define OSM_VERSION "1.316"
71 #define OSM_DESCRIPTION "I2O SCSI Peripheral OSM"
72
73 static struct i2o_driver i2o_scsi_driver;
74
75 static unsigned int i2o_scsi_max_id = 16;
76 static unsigned int i2o_scsi_max_lun = 255;
77
78 struct i2o_scsi_host {
79 struct Scsi_Host *scsi_host; /* pointer to the SCSI host */
80 struct i2o_controller *iop; /* pointer to the I2O controller */
81 u64 lun; /* lun's used for block devices */
82 struct i2o_device *channel[0]; /* channel->i2o_dev mapping table */
83 };
84
85 static struct scsi_host_template i2o_scsi_host_template;
86
87 #define I2O_SCSI_CAN_QUEUE 4
88
89 /* SCSI OSM class handling definition */
90 static struct i2o_class_id i2o_scsi_class_id[] = {
91 {I2O_CLASS_SCSI_PERIPHERAL},
92 {I2O_CLASS_END}
93 };
94
i2o_scsi_host_alloc(struct i2o_controller * c)95 static struct i2o_scsi_host *i2o_scsi_host_alloc(struct i2o_controller *c)
96 {
97 struct i2o_scsi_host *i2o_shost;
98 struct i2o_device *i2o_dev;
99 struct Scsi_Host *scsi_host;
100 int max_channel = 0;
101 u8 type;
102 int i;
103 size_t size;
104 u16 body_size = 6;
105
106 #ifdef CONFIG_I2O_EXT_ADAPTEC
107 if (c->adaptec)
108 body_size = 8;
109 #endif
110
111 list_for_each_entry(i2o_dev, &c->devices, list)
112 if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER) {
113 if (!i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1)
114 && (type == 0x01)) /* SCSI bus */
115 max_channel++;
116 }
117
118 if (!max_channel) {
119 osm_warn("no channels found on %s\n", c->name);
120 return ERR_PTR(-EFAULT);
121 }
122
123 size = max_channel * sizeof(struct i2o_device *)
124 + sizeof(struct i2o_scsi_host);
125
126 scsi_host = scsi_host_alloc(&i2o_scsi_host_template, size);
127 if (!scsi_host) {
128 osm_warn("Could not allocate SCSI host\n");
129 return ERR_PTR(-ENOMEM);
130 }
131
132 scsi_host->max_channel = max_channel - 1;
133 scsi_host->max_id = i2o_scsi_max_id;
134 scsi_host->max_lun = i2o_scsi_max_lun;
135 scsi_host->this_id = c->unit;
136 scsi_host->sg_tablesize = i2o_sg_tablesize(c, body_size);
137
138 i2o_shost = (struct i2o_scsi_host *)scsi_host->hostdata;
139 i2o_shost->scsi_host = scsi_host;
140 i2o_shost->iop = c;
141 i2o_shost->lun = 1;
142
143 i = 0;
144 list_for_each_entry(i2o_dev, &c->devices, list)
145 if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER) {
146 if (!i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1)
147 && (type == 0x01)) /* only SCSI bus */
148 i2o_shost->channel[i++] = i2o_dev;
149
150 if (i >= max_channel)
151 break;
152 }
153
154 return i2o_shost;
155 };
156
157 /**
158 * i2o_scsi_get_host - Get an I2O SCSI host
159 * @c: I2O controller to for which to get the SCSI host
160 *
161 * If the I2O controller already exists as SCSI host, the SCSI host
162 * is returned, otherwise the I2O controller is added to the SCSI
163 * core.
164 *
165 * Returns pointer to the I2O SCSI host on success or NULL on failure.
166 */
i2o_scsi_get_host(struct i2o_controller * c)167 static struct i2o_scsi_host *i2o_scsi_get_host(struct i2o_controller *c)
168 {
169 return c->driver_data[i2o_scsi_driver.context];
170 };
171
172 /**
173 * i2o_scsi_remove - Remove I2O device from SCSI core
174 * @dev: device which should be removed
175 *
176 * Removes the I2O device from the SCSI core again.
177 *
178 * Returns 0 on success.
179 */
i2o_scsi_remove(struct device * dev)180 static int i2o_scsi_remove(struct device *dev)
181 {
182 struct i2o_device *i2o_dev = to_i2o_device(dev);
183 struct i2o_controller *c = i2o_dev->iop;
184 struct i2o_scsi_host *i2o_shost;
185 struct scsi_device *scsi_dev;
186
187 osm_info("device removed (TID: %03x)\n", i2o_dev->lct_data.tid);
188
189 i2o_shost = i2o_scsi_get_host(c);
190
191 shost_for_each_device(scsi_dev, i2o_shost->scsi_host)
192 if (scsi_dev->hostdata == i2o_dev) {
193 sysfs_remove_link(&i2o_dev->device.kobj, "scsi");
194 scsi_remove_device(scsi_dev);
195 scsi_device_put(scsi_dev);
196 break;
197 }
198
199 return 0;
200 };
201
202 /**
203 * i2o_scsi_probe - verify if dev is a I2O SCSI device and install it
204 * @dev: device to verify if it is a I2O SCSI device
205 *
206 * Retrieve channel, id and lun for I2O device. If everything goes well
207 * register the I2O device as SCSI device on the I2O SCSI controller.
208 *
209 * Returns 0 on success or negative error code on failure.
210 */
i2o_scsi_probe(struct device * dev)211 static int i2o_scsi_probe(struct device *dev)
212 {
213 struct i2o_device *i2o_dev = to_i2o_device(dev);
214 struct i2o_controller *c = i2o_dev->iop;
215 struct i2o_scsi_host *i2o_shost;
216 struct Scsi_Host *scsi_host;
217 struct i2o_device *parent;
218 struct scsi_device *scsi_dev;
219 u32 id = -1;
220 u64 lun = -1;
221 int channel = -1;
222 int i, rc;
223
224 i2o_shost = i2o_scsi_get_host(c);
225 if (!i2o_shost)
226 return -EFAULT;
227
228 scsi_host = i2o_shost->scsi_host;
229
230 switch (i2o_dev->lct_data.class_id) {
231 case I2O_CLASS_RANDOM_BLOCK_STORAGE:
232 case I2O_CLASS_EXECUTIVE:
233 #ifdef CONFIG_I2O_EXT_ADAPTEC
234 if (c->adaptec) {
235 u8 type;
236 struct i2o_device *d = i2o_shost->channel[0];
237
238 if (!i2o_parm_field_get(d, 0x0000, 0, &type, 1)
239 && (type == 0x01)) /* SCSI bus */
240 if (!i2o_parm_field_get(d, 0x0200, 4, &id, 4)) {
241 channel = 0;
242 if (i2o_dev->lct_data.class_id ==
243 I2O_CLASS_RANDOM_BLOCK_STORAGE)
244 lun =
245 cpu_to_le64(i2o_shost->
246 lun++);
247 else
248 lun = 0;
249 }
250 }
251 #endif
252 break;
253
254 case I2O_CLASS_SCSI_PERIPHERAL:
255 if (i2o_parm_field_get(i2o_dev, 0x0000, 3, &id, 4))
256 return -EFAULT;
257
258 if (i2o_parm_field_get(i2o_dev, 0x0000, 4, &lun, 8))
259 return -EFAULT;
260
261 parent = i2o_iop_find_device(c, i2o_dev->lct_data.parent_tid);
262 if (!parent) {
263 osm_warn("can not find parent of device %03x\n",
264 i2o_dev->lct_data.tid);
265 return -EFAULT;
266 }
267
268 for (i = 0; i <= i2o_shost->scsi_host->max_channel; i++)
269 if (i2o_shost->channel[i] == parent)
270 channel = i;
271 break;
272
273 default:
274 return -EFAULT;
275 }
276
277 if (channel == -1) {
278 osm_warn("can not find channel of device %03x\n",
279 i2o_dev->lct_data.tid);
280 return -EFAULT;
281 }
282
283 if (le32_to_cpu(id) >= scsi_host->max_id) {
284 osm_warn("SCSI device id (%d) >= max_id of I2O host (%d)",
285 le32_to_cpu(id), scsi_host->max_id);
286 return -EFAULT;
287 }
288
289 if (le64_to_cpu(lun) >= scsi_host->max_lun) {
290 osm_warn("SCSI device lun (%llu) >= max_lun of I2O host (%llu)",
291 le64_to_cpu(lun), scsi_host->max_lun);
292 return -EFAULT;
293 }
294
295 scsi_dev =
296 __scsi_add_device(i2o_shost->scsi_host, channel, le32_to_cpu(id),
297 le64_to_cpu(lun), i2o_dev);
298
299 if (IS_ERR(scsi_dev)) {
300 osm_warn("can not add SCSI device %03x\n",
301 i2o_dev->lct_data.tid);
302 return PTR_ERR(scsi_dev);
303 }
304
305 rc = sysfs_create_link(&i2o_dev->device.kobj,
306 &scsi_dev->sdev_gendev.kobj, "scsi");
307 if (rc)
308 goto err;
309
310 osm_info("device added (TID: %03x) channel: %d, id: %d, lun: %llu\n",
311 i2o_dev->lct_data.tid, channel, le32_to_cpu(id),
312 le64_to_cpu(lun));
313
314 return 0;
315
316 err:
317 scsi_remove_device(scsi_dev);
318 return rc;
319 };
320
i2o_scsi_info(struct Scsi_Host * SChost)321 static const char *i2o_scsi_info(struct Scsi_Host *SChost)
322 {
323 struct i2o_scsi_host *hostdata;
324 hostdata = (struct i2o_scsi_host *)SChost->hostdata;
325 return hostdata->iop->name;
326 }
327
328 /**
329 * i2o_scsi_reply - SCSI OSM message reply handler
330 * @c: controller issuing the reply
331 * @m: message id for flushing
332 * @msg: the message from the controller
333 *
334 * Process reply messages (interrupts in normal scsi controller think).
335 * We can get a variety of messages to process. The normal path is
336 * scsi command completions. We must also deal with IOP failures,
337 * the reply to a bus reset and the reply to a LUN query.
338 *
339 * Returns 0 on success and if the reply should not be flushed or > 0
340 * on success and if the reply should be flushed. Returns negative error
341 * code on failure and if the reply should be flushed.
342 */
i2o_scsi_reply(struct i2o_controller * c,u32 m,struct i2o_message * msg)343 static int i2o_scsi_reply(struct i2o_controller *c, u32 m,
344 struct i2o_message *msg)
345 {
346 struct scsi_cmnd *cmd;
347 u32 error;
348 struct device *dev;
349
350 cmd = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt));
351 if (unlikely(!cmd)) {
352 osm_err("NULL reply received!\n");
353 return -1;
354 }
355
356 /*
357 * Low byte is device status, next is adapter status,
358 * (then one byte reserved), then request status.
359 */
360 error = le32_to_cpu(msg->body[0]);
361
362 osm_debug("Completed %0x%p\n", cmd);
363
364 cmd->result = error & 0xff;
365 /*
366 * if DeviceStatus is not SCSI_SUCCESS copy over the sense data and let
367 * the SCSI layer handle the error
368 */
369 if (cmd->result)
370 memcpy(cmd->sense_buffer, &msg->body[3],
371 min(SCSI_SENSE_BUFFERSIZE, 40));
372
373 /* only output error code if AdapterStatus is not HBA_SUCCESS */
374 if ((error >> 8) & 0xff)
375 osm_err("SCSI error %08x\n", error);
376
377 dev = &c->pdev->dev;
378
379 scsi_dma_unmap(cmd);
380
381 cmd->scsi_done(cmd);
382
383 return 1;
384 };
385
386 /**
387 * i2o_scsi_notify_device_add - Retrieve notifications of added devices
388 * @i2o_dev: the I2O device which was added
389 *
390 * If a I2O device is added we catch the notification, because I2O classes
391 * other than SCSI peripheral will not be received through
392 * i2o_scsi_probe().
393 */
i2o_scsi_notify_device_add(struct i2o_device * i2o_dev)394 static void i2o_scsi_notify_device_add(struct i2o_device *i2o_dev)
395 {
396 switch (i2o_dev->lct_data.class_id) {
397 case I2O_CLASS_EXECUTIVE:
398 case I2O_CLASS_RANDOM_BLOCK_STORAGE:
399 i2o_scsi_probe(&i2o_dev->device);
400 break;
401
402 default:
403 break;
404 }
405 };
406
407 /**
408 * i2o_scsi_notify_device_remove - Retrieve notifications of removed devices
409 * @i2o_dev: the I2O device which was removed
410 *
411 * If a I2O device is removed, we catch the notification to remove the
412 * corresponding SCSI device.
413 */
i2o_scsi_notify_device_remove(struct i2o_device * i2o_dev)414 static void i2o_scsi_notify_device_remove(struct i2o_device *i2o_dev)
415 {
416 switch (i2o_dev->lct_data.class_id) {
417 case I2O_CLASS_EXECUTIVE:
418 case I2O_CLASS_RANDOM_BLOCK_STORAGE:
419 i2o_scsi_remove(&i2o_dev->device);
420 break;
421
422 default:
423 break;
424 }
425 };
426
427 /**
428 * i2o_scsi_notify_controller_add - Retrieve notifications of added controllers
429 * @c: the controller which was added
430 *
431 * If a I2O controller is added, we catch the notification to add a
432 * corresponding Scsi_Host.
433 */
i2o_scsi_notify_controller_add(struct i2o_controller * c)434 static void i2o_scsi_notify_controller_add(struct i2o_controller *c)
435 {
436 struct i2o_scsi_host *i2o_shost;
437 int rc;
438
439 i2o_shost = i2o_scsi_host_alloc(c);
440 if (IS_ERR(i2o_shost)) {
441 osm_err("Could not initialize SCSI host\n");
442 return;
443 }
444
445 rc = scsi_add_host(i2o_shost->scsi_host, &c->device);
446 if (rc) {
447 osm_err("Could not add SCSI host\n");
448 scsi_host_put(i2o_shost->scsi_host);
449 return;
450 }
451
452 c->driver_data[i2o_scsi_driver.context] = i2o_shost;
453
454 osm_debug("new I2O SCSI host added\n");
455 };
456
457 /**
458 * i2o_scsi_notify_controller_remove - Retrieve notifications of removed controllers
459 * @c: the controller which was removed
460 *
461 * If a I2O controller is removed, we catch the notification to remove the
462 * corresponding Scsi_Host.
463 */
i2o_scsi_notify_controller_remove(struct i2o_controller * c)464 static void i2o_scsi_notify_controller_remove(struct i2o_controller *c)
465 {
466 struct i2o_scsi_host *i2o_shost;
467 i2o_shost = i2o_scsi_get_host(c);
468 if (!i2o_shost)
469 return;
470
471 c->driver_data[i2o_scsi_driver.context] = NULL;
472
473 scsi_remove_host(i2o_shost->scsi_host);
474 scsi_host_put(i2o_shost->scsi_host);
475 osm_debug("I2O SCSI host removed\n");
476 };
477
478 /* SCSI OSM driver struct */
479 static struct i2o_driver i2o_scsi_driver = {
480 .name = OSM_NAME,
481 .reply = i2o_scsi_reply,
482 .classes = i2o_scsi_class_id,
483 .notify_device_add = i2o_scsi_notify_device_add,
484 .notify_device_remove = i2o_scsi_notify_device_remove,
485 .notify_controller_add = i2o_scsi_notify_controller_add,
486 .notify_controller_remove = i2o_scsi_notify_controller_remove,
487 .driver = {
488 .probe = i2o_scsi_probe,
489 .remove = i2o_scsi_remove,
490 },
491 };
492
493 /**
494 * i2o_scsi_queuecommand - queue a SCSI command
495 * @SCpnt: scsi command pointer
496 * @done: callback for completion
497 *
498 * Issue a scsi command asynchronously. Return 0 on success or 1 if
499 * we hit an error (normally message queue congestion). The only
500 * minor complication here is that I2O deals with the device addressing
501 * so we have to map the bus/dev/lun back to an I2O handle as well
502 * as faking absent devices ourself.
503 *
504 * Locks: takes the controller lock on error path only
505 */
506
i2o_scsi_queuecommand_lck(struct scsi_cmnd * SCpnt,void (* done)(struct scsi_cmnd *))507 static int i2o_scsi_queuecommand_lck(struct scsi_cmnd *SCpnt,
508 void (*done) (struct scsi_cmnd *))
509 {
510 struct i2o_controller *c;
511 struct i2o_device *i2o_dev;
512 int tid;
513 struct i2o_message *msg;
514 /*
515 * ENABLE_DISCONNECT
516 * SIMPLE_TAG
517 * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME
518 */
519 u32 scsi_flags = 0x20a00000;
520 u32 sgl_offset;
521 u32 *mptr;
522 u32 cmd = I2O_CMD_SCSI_EXEC << 24;
523 int rc = 0;
524
525 /*
526 * Do the incoming paperwork
527 */
528 i2o_dev = SCpnt->device->hostdata;
529
530 SCpnt->scsi_done = done;
531
532 if (unlikely(!i2o_dev)) {
533 osm_warn("no I2O device in request\n");
534 SCpnt->result = DID_NO_CONNECT << 16;
535 done(SCpnt);
536 goto exit;
537 }
538 c = i2o_dev->iop;
539 tid = i2o_dev->lct_data.tid;
540
541 osm_debug("qcmd: Tid = %03x\n", tid);
542 osm_debug("Real scsi messages.\n");
543
544 /*
545 * Put together a scsi execscb message
546 */
547 switch (SCpnt->sc_data_direction) {
548 case PCI_DMA_NONE:
549 /* DATA NO XFER */
550 sgl_offset = SGL_OFFSET_0;
551 break;
552
553 case PCI_DMA_TODEVICE:
554 /* DATA OUT (iop-->dev) */
555 scsi_flags |= 0x80000000;
556 sgl_offset = SGL_OFFSET_10;
557 break;
558
559 case PCI_DMA_FROMDEVICE:
560 /* DATA IN (iop<--dev) */
561 scsi_flags |= 0x40000000;
562 sgl_offset = SGL_OFFSET_10;
563 break;
564
565 default:
566 /* Unknown - kill the command */
567 SCpnt->result = DID_NO_CONNECT << 16;
568 done(SCpnt);
569 goto exit;
570 }
571
572 /*
573 * Obtain an I2O message. If there are none free then
574 * throw it back to the scsi layer
575 */
576
577 msg = i2o_msg_get(c);
578 if (IS_ERR(msg)) {
579 rc = SCSI_MLQUEUE_HOST_BUSY;
580 goto exit;
581 }
582
583 mptr = &msg->body[0];
584
585 #if 0 /* this code can't work */
586 #ifdef CONFIG_I2O_EXT_ADAPTEC
587 if (c->adaptec) {
588 u32 adpt_flags = 0;
589
590 if (SCpnt->sc_request && SCpnt->sc_request->upper_private_data) {
591 i2o_sg_io_hdr_t __user *usr_ptr =
592 ((Sg_request *) (SCpnt->sc_request->
593 upper_private_data))->header.
594 usr_ptr;
595
596 if (usr_ptr)
597 get_user(adpt_flags, &usr_ptr->flags);
598 }
599
600 switch (i2o_dev->lct_data.class_id) {
601 case I2O_CLASS_EXECUTIVE:
602 case I2O_CLASS_RANDOM_BLOCK_STORAGE:
603 /* interpret flag has to be set for executive */
604 adpt_flags ^= I2O_DPT_SG_FLAG_INTERPRET;
605 break;
606
607 default:
608 break;
609 }
610
611 /*
612 * for Adaptec controllers we use the PRIVATE command, because
613 * the normal SCSI EXEC doesn't support all SCSI commands on
614 * all controllers (for example READ CAPACITY).
615 */
616 if (sgl_offset == SGL_OFFSET_10)
617 sgl_offset = SGL_OFFSET_12;
618 cmd = I2O_CMD_PRIVATE << 24;
619 *mptr++ = cpu_to_le32(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC);
620 *mptr++ = cpu_to_le32(adpt_flags | tid);
621 }
622 #endif
623 #endif
624
625 msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid);
626 msg->u.s.icntxt = cpu_to_le32(i2o_scsi_driver.context);
627
628 /* We want the SCSI control block back */
629 msg->u.s.tcntxt = cpu_to_le32(i2o_cntxt_list_add(c, SCpnt));
630
631 /* LSI_920_PCI_QUIRK
632 *
633 * Intermittant observations of msg frame word data corruption
634 * observed on msg[4] after:
635 * WRITE, READ-MODIFY-WRITE
636 * operations. 19990606 -sralston
637 *
638 * (Hence we build this word via tag. Its good practice anyway
639 * we don't want fetches over PCI needlessly)
640 */
641
642 /* Attach tags to the devices */
643 /* FIXME: implement
644 if(SCpnt->device->tagged_supported) {
645 if(SCpnt->tag == HEAD_OF_QUEUE_TAG)
646 scsi_flags |= 0x01000000;
647 else if(SCpnt->tag == ORDERED_QUEUE_TAG)
648 scsi_flags |= 0x01800000;
649 }
650 */
651
652 *mptr++ = cpu_to_le32(scsi_flags | SCpnt->cmd_len);
653
654 /* Write SCSI command into the message - always 16 byte block */
655 memcpy(mptr, SCpnt->cmnd, 16);
656 mptr += 4;
657
658 if (sgl_offset != SGL_OFFSET_0) {
659 /* write size of data addressed by SGL */
660 *mptr++ = cpu_to_le32(scsi_bufflen(SCpnt));
661
662 /* Now fill in the SGList and command */
663
664 if (scsi_sg_count(SCpnt)) {
665 if (!i2o_dma_map_sg(c, scsi_sglist(SCpnt),
666 scsi_sg_count(SCpnt),
667 SCpnt->sc_data_direction, &mptr))
668 goto nomem;
669 }
670 }
671
672 /* Stick the headers on */
673 msg->u.head[0] =
674 cpu_to_le32(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset);
675
676 /* Queue the message */
677 i2o_msg_post(c, msg);
678
679 osm_debug("Issued %0x%p\n", SCpnt);
680
681 return 0;
682
683 nomem:
684 rc = -ENOMEM;
685 i2o_msg_nop(c, msg);
686
687 exit:
688 return rc;
689 }
690
DEF_SCSI_QCMD(i2o_scsi_queuecommand)691 static DEF_SCSI_QCMD(i2o_scsi_queuecommand)
692
693 /**
694 * i2o_scsi_abort - abort a running command
695 * @SCpnt: command to abort
696 *
697 * Ask the I2O controller to abort a command. This is an asynchrnous
698 * process and our callback handler will see the command complete with an
699 * aborted message if it succeeds.
700 *
701 * Returns 0 if the command is successfully aborted or negative error code
702 * on failure.
703 */
704 static int i2o_scsi_abort(struct scsi_cmnd *SCpnt)
705 {
706 struct i2o_device *i2o_dev;
707 struct i2o_controller *c;
708 struct i2o_message *msg;
709 int tid;
710 int status = FAILED;
711
712 osm_warn("Aborting command block.\n");
713
714 i2o_dev = SCpnt->device->hostdata;
715 c = i2o_dev->iop;
716 tid = i2o_dev->lct_data.tid;
717
718 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
719 if (IS_ERR(msg))
720 return SCSI_MLQUEUE_HOST_BUSY;
721
722 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
723 msg->u.head[1] =
724 cpu_to_le32(I2O_CMD_SCSI_ABORT << 24 | HOST_TID << 12 | tid);
725 msg->body[0] = cpu_to_le32(i2o_cntxt_list_get_ptr(c, SCpnt));
726
727 if (!i2o_msg_post_wait(c, msg, I2O_TIMEOUT_SCSI_SCB_ABORT))
728 status = SUCCESS;
729
730 return status;
731 }
732
733 /**
734 * i2o_scsi_bios_param - Invent disk geometry
735 * @sdev: scsi device
736 * @dev: block layer device
737 * @capacity: size in sectors
738 * @ip: geometry array
739 *
740 * This is anyone's guess quite frankly. We use the same rules everyone
741 * else appears to and hope. It seems to work.
742 */
743
i2o_scsi_bios_param(struct scsi_device * sdev,struct block_device * dev,sector_t capacity,int * ip)744 static int i2o_scsi_bios_param(struct scsi_device *sdev,
745 struct block_device *dev, sector_t capacity,
746 int *ip)
747 {
748 int size;
749
750 size = capacity;
751 ip[0] = 64; /* heads */
752 ip[1] = 32; /* sectors */
753 if ((ip[2] = size >> 11) > 1024) { /* cylinders, test for big disk */
754 ip[0] = 255; /* heads */
755 ip[1] = 63; /* sectors */
756 ip[2] = size / (255 * 63); /* cylinders */
757 }
758 return 0;
759 }
760
761 static struct scsi_host_template i2o_scsi_host_template = {
762 .proc_name = OSM_NAME,
763 .name = OSM_DESCRIPTION,
764 .info = i2o_scsi_info,
765 .queuecommand = i2o_scsi_queuecommand,
766 .eh_abort_handler = i2o_scsi_abort,
767 .bios_param = i2o_scsi_bios_param,
768 .can_queue = I2O_SCSI_CAN_QUEUE,
769 .sg_tablesize = 8,
770 .cmd_per_lun = 6,
771 .use_clustering = ENABLE_CLUSTERING,
772 };
773
774 /**
775 * i2o_scsi_init - SCSI OSM initialization function
776 *
777 * Register SCSI OSM into I2O core.
778 *
779 * Returns 0 on success or negative error code on failure.
780 */
i2o_scsi_init(void)781 static int __init i2o_scsi_init(void)
782 {
783 int rc;
784
785 printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
786
787 /* Register SCSI OSM into I2O core */
788 rc = i2o_driver_register(&i2o_scsi_driver);
789 if (rc) {
790 osm_err("Could not register SCSI driver\n");
791 return rc;
792 }
793
794 return 0;
795 };
796
797 /**
798 * i2o_scsi_exit - SCSI OSM exit function
799 *
800 * Unregisters SCSI OSM from I2O core.
801 */
i2o_scsi_exit(void)802 static void __exit i2o_scsi_exit(void)
803 {
804 /* Unregister I2O SCSI OSM from I2O core */
805 i2o_driver_unregister(&i2o_scsi_driver);
806 };
807
808 MODULE_AUTHOR("Red Hat Software");
809 MODULE_LICENSE("GPL");
810 MODULE_DESCRIPTION(OSM_DESCRIPTION);
811 MODULE_VERSION(OSM_VERSION);
812
813 module_init(i2o_scsi_init);
814 module_exit(i2o_scsi_exit);
815