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 unsigned int 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 (%lu) >= max_lun of I2O host (%d)",
291 (long unsigned int)le64_to_cpu(lun),
292 scsi_host->max_lun);
293 return -EFAULT;
294 }
295
296 scsi_dev =
297 __scsi_add_device(i2o_shost->scsi_host, channel, le32_to_cpu(id),
298 le64_to_cpu(lun), i2o_dev);
299
300 if (IS_ERR(scsi_dev)) {
301 osm_warn("can not add SCSI device %03x\n",
302 i2o_dev->lct_data.tid);
303 return PTR_ERR(scsi_dev);
304 }
305
306 rc = sysfs_create_link(&i2o_dev->device.kobj,
307 &scsi_dev->sdev_gendev.kobj, "scsi");
308 if (rc)
309 goto err;
310
311 osm_info("device added (TID: %03x) channel: %d, id: %d, lun: %ld\n",
312 i2o_dev->lct_data.tid, channel, le32_to_cpu(id),
313 (long unsigned int)le64_to_cpu(lun));
314
315 return 0;
316
317 err:
318 scsi_remove_device(scsi_dev);
319 return rc;
320 };
321
i2o_scsi_info(struct Scsi_Host * SChost)322 static const char *i2o_scsi_info(struct Scsi_Host *SChost)
323 {
324 struct i2o_scsi_host *hostdata;
325 hostdata = (struct i2o_scsi_host *)SChost->hostdata;
326 return hostdata->iop->name;
327 }
328
329 /**
330 * i2o_scsi_reply - SCSI OSM message reply handler
331 * @c: controller issuing the reply
332 * @m: message id for flushing
333 * @msg: the message from the controller
334 *
335 * Process reply messages (interrupts in normal scsi controller think).
336 * We can get a variety of messages to process. The normal path is
337 * scsi command completions. We must also deal with IOP failures,
338 * the reply to a bus reset and the reply to a LUN query.
339 *
340 * Returns 0 on success and if the reply should not be flushed or > 0
341 * on success and if the reply should be flushed. Returns negative error
342 * code on failure and if the reply should be flushed.
343 */
i2o_scsi_reply(struct i2o_controller * c,u32 m,struct i2o_message * msg)344 static int i2o_scsi_reply(struct i2o_controller *c, u32 m,
345 struct i2o_message *msg)
346 {
347 struct scsi_cmnd *cmd;
348 u32 error;
349 struct device *dev;
350
351 cmd = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt));
352 if (unlikely(!cmd)) {
353 osm_err("NULL reply received!\n");
354 return -1;
355 }
356
357 /*
358 * Low byte is device status, next is adapter status,
359 * (then one byte reserved), then request status.
360 */
361 error = le32_to_cpu(msg->body[0]);
362
363 osm_debug("Completed %0x%p\n", cmd);
364
365 cmd->result = error & 0xff;
366 /*
367 * if DeviceStatus is not SCSI_SUCCESS copy over the sense data and let
368 * the SCSI layer handle the error
369 */
370 if (cmd->result)
371 memcpy(cmd->sense_buffer, &msg->body[3],
372 min(SCSI_SENSE_BUFFERSIZE, 40));
373
374 /* only output error code if AdapterStatus is not HBA_SUCCESS */
375 if ((error >> 8) & 0xff)
376 osm_err("SCSI error %08x\n", error);
377
378 dev = &c->pdev->dev;
379
380 scsi_dma_unmap(cmd);
381
382 cmd->scsi_done(cmd);
383
384 return 1;
385 };
386
387 /**
388 * i2o_scsi_notify_device_add - Retrieve notifications of added devices
389 * @i2o_dev: the I2O device which was added
390 *
391 * If a I2O device is added we catch the notification, because I2O classes
392 * other than SCSI peripheral will not be received through
393 * i2o_scsi_probe().
394 */
i2o_scsi_notify_device_add(struct i2o_device * i2o_dev)395 static void i2o_scsi_notify_device_add(struct i2o_device *i2o_dev)
396 {
397 switch (i2o_dev->lct_data.class_id) {
398 case I2O_CLASS_EXECUTIVE:
399 case I2O_CLASS_RANDOM_BLOCK_STORAGE:
400 i2o_scsi_probe(&i2o_dev->device);
401 break;
402
403 default:
404 break;
405 }
406 };
407
408 /**
409 * i2o_scsi_notify_device_remove - Retrieve notifications of removed devices
410 * @i2o_dev: the I2O device which was removed
411 *
412 * If a I2O device is removed, we catch the notification to remove the
413 * corresponding SCSI device.
414 */
i2o_scsi_notify_device_remove(struct i2o_device * i2o_dev)415 static void i2o_scsi_notify_device_remove(struct i2o_device *i2o_dev)
416 {
417 switch (i2o_dev->lct_data.class_id) {
418 case I2O_CLASS_EXECUTIVE:
419 case I2O_CLASS_RANDOM_BLOCK_STORAGE:
420 i2o_scsi_remove(&i2o_dev->device);
421 break;
422
423 default:
424 break;
425 }
426 };
427
428 /**
429 * i2o_scsi_notify_controller_add - Retrieve notifications of added controllers
430 * @c: the controller which was added
431 *
432 * If a I2O controller is added, we catch the notification to add a
433 * corresponding Scsi_Host.
434 */
i2o_scsi_notify_controller_add(struct i2o_controller * c)435 static void i2o_scsi_notify_controller_add(struct i2o_controller *c)
436 {
437 struct i2o_scsi_host *i2o_shost;
438 int rc;
439
440 i2o_shost = i2o_scsi_host_alloc(c);
441 if (IS_ERR(i2o_shost)) {
442 osm_err("Could not initialize SCSI host\n");
443 return;
444 }
445
446 rc = scsi_add_host(i2o_shost->scsi_host, &c->device);
447 if (rc) {
448 osm_err("Could not add SCSI host\n");
449 scsi_host_put(i2o_shost->scsi_host);
450 return;
451 }
452
453 c->driver_data[i2o_scsi_driver.context] = i2o_shost;
454
455 osm_debug("new I2O SCSI host added\n");
456 };
457
458 /**
459 * i2o_scsi_notify_controller_remove - Retrieve notifications of removed controllers
460 * @c: the controller which was removed
461 *
462 * If a I2O controller is removed, we catch the notification to remove the
463 * corresponding Scsi_Host.
464 */
i2o_scsi_notify_controller_remove(struct i2o_controller * c)465 static void i2o_scsi_notify_controller_remove(struct i2o_controller *c)
466 {
467 struct i2o_scsi_host *i2o_shost;
468 i2o_shost = i2o_scsi_get_host(c);
469 if (!i2o_shost)
470 return;
471
472 c->driver_data[i2o_scsi_driver.context] = NULL;
473
474 scsi_remove_host(i2o_shost->scsi_host);
475 scsi_host_put(i2o_shost->scsi_host);
476 osm_debug("I2O SCSI host removed\n");
477 };
478
479 /* SCSI OSM driver struct */
480 static struct i2o_driver i2o_scsi_driver = {
481 .name = OSM_NAME,
482 .reply = i2o_scsi_reply,
483 .classes = i2o_scsi_class_id,
484 .notify_device_add = i2o_scsi_notify_device_add,
485 .notify_device_remove = i2o_scsi_notify_device_remove,
486 .notify_controller_add = i2o_scsi_notify_controller_add,
487 .notify_controller_remove = i2o_scsi_notify_controller_remove,
488 .driver = {
489 .probe = i2o_scsi_probe,
490 .remove = i2o_scsi_remove,
491 },
492 };
493
494 /**
495 * i2o_scsi_queuecommand - queue a SCSI command
496 * @SCpnt: scsi command pointer
497 * @done: callback for completion
498 *
499 * Issue a scsi command asynchronously. Return 0 on success or 1 if
500 * we hit an error (normally message queue congestion). The only
501 * minor complication here is that I2O deals with the device addressing
502 * so we have to map the bus/dev/lun back to an I2O handle as well
503 * as faking absent devices ourself.
504 *
505 * Locks: takes the controller lock on error path only
506 */
507
i2o_scsi_queuecommand_lck(struct scsi_cmnd * SCpnt,void (* done)(struct scsi_cmnd *))508 static int i2o_scsi_queuecommand_lck(struct scsi_cmnd *SCpnt,
509 void (*done) (struct scsi_cmnd *))
510 {
511 struct i2o_controller *c;
512 struct i2o_device *i2o_dev;
513 int tid;
514 struct i2o_message *msg;
515 /*
516 * ENABLE_DISCONNECT
517 * SIMPLE_TAG
518 * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME
519 */
520 u32 scsi_flags = 0x20a00000;
521 u32 sgl_offset;
522 u32 *mptr;
523 u32 cmd = I2O_CMD_SCSI_EXEC << 24;
524 int rc = 0;
525
526 /*
527 * Do the incoming paperwork
528 */
529 i2o_dev = SCpnt->device->hostdata;
530
531 SCpnt->scsi_done = done;
532
533 if (unlikely(!i2o_dev)) {
534 osm_warn("no I2O device in request\n");
535 SCpnt->result = DID_NO_CONNECT << 16;
536 done(SCpnt);
537 goto exit;
538 }
539 c = i2o_dev->iop;
540 tid = i2o_dev->lct_data.tid;
541
542 osm_debug("qcmd: Tid = %03x\n", tid);
543 osm_debug("Real scsi messages.\n");
544
545 /*
546 * Put together a scsi execscb message
547 */
548 switch (SCpnt->sc_data_direction) {
549 case PCI_DMA_NONE:
550 /* DATA NO XFER */
551 sgl_offset = SGL_OFFSET_0;
552 break;
553
554 case PCI_DMA_TODEVICE:
555 /* DATA OUT (iop-->dev) */
556 scsi_flags |= 0x80000000;
557 sgl_offset = SGL_OFFSET_10;
558 break;
559
560 case PCI_DMA_FROMDEVICE:
561 /* DATA IN (iop<--dev) */
562 scsi_flags |= 0x40000000;
563 sgl_offset = SGL_OFFSET_10;
564 break;
565
566 default:
567 /* Unknown - kill the command */
568 SCpnt->result = DID_NO_CONNECT << 16;
569 done(SCpnt);
570 goto exit;
571 }
572
573 /*
574 * Obtain an I2O message. If there are none free then
575 * throw it back to the scsi layer
576 */
577
578 msg = i2o_msg_get(c);
579 if (IS_ERR(msg)) {
580 rc = SCSI_MLQUEUE_HOST_BUSY;
581 goto exit;
582 }
583
584 mptr = &msg->body[0];
585
586 #if 0 /* this code can't work */
587 #ifdef CONFIG_I2O_EXT_ADAPTEC
588 if (c->adaptec) {
589 u32 adpt_flags = 0;
590
591 if (SCpnt->sc_request && SCpnt->sc_request->upper_private_data) {
592 i2o_sg_io_hdr_t __user *usr_ptr =
593 ((Sg_request *) (SCpnt->sc_request->
594 upper_private_data))->header.
595 usr_ptr;
596
597 if (usr_ptr)
598 get_user(adpt_flags, &usr_ptr->flags);
599 }
600
601 switch (i2o_dev->lct_data.class_id) {
602 case I2O_CLASS_EXECUTIVE:
603 case I2O_CLASS_RANDOM_BLOCK_STORAGE:
604 /* interpret flag has to be set for executive */
605 adpt_flags ^= I2O_DPT_SG_FLAG_INTERPRET;
606 break;
607
608 default:
609 break;
610 }
611
612 /*
613 * for Adaptec controllers we use the PRIVATE command, because
614 * the normal SCSI EXEC doesn't support all SCSI commands on
615 * all controllers (for example READ CAPACITY).
616 */
617 if (sgl_offset == SGL_OFFSET_10)
618 sgl_offset = SGL_OFFSET_12;
619 cmd = I2O_CMD_PRIVATE << 24;
620 *mptr++ = cpu_to_le32(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC);
621 *mptr++ = cpu_to_le32(adpt_flags | tid);
622 }
623 #endif
624 #endif
625
626 msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid);
627 msg->u.s.icntxt = cpu_to_le32(i2o_scsi_driver.context);
628
629 /* We want the SCSI control block back */
630 msg->u.s.tcntxt = cpu_to_le32(i2o_cntxt_list_add(c, SCpnt));
631
632 /* LSI_920_PCI_QUIRK
633 *
634 * Intermittant observations of msg frame word data corruption
635 * observed on msg[4] after:
636 * WRITE, READ-MODIFY-WRITE
637 * operations. 19990606 -sralston
638 *
639 * (Hence we build this word via tag. Its good practice anyway
640 * we don't want fetches over PCI needlessly)
641 */
642
643 /* Attach tags to the devices */
644 /* FIXME: implement
645 if(SCpnt->device->tagged_supported) {
646 if(SCpnt->tag == HEAD_OF_QUEUE_TAG)
647 scsi_flags |= 0x01000000;
648 else if(SCpnt->tag == ORDERED_QUEUE_TAG)
649 scsi_flags |= 0x01800000;
650 }
651 */
652
653 *mptr++ = cpu_to_le32(scsi_flags | SCpnt->cmd_len);
654
655 /* Write SCSI command into the message - always 16 byte block */
656 memcpy(mptr, SCpnt->cmnd, 16);
657 mptr += 4;
658
659 if (sgl_offset != SGL_OFFSET_0) {
660 /* write size of data addressed by SGL */
661 *mptr++ = cpu_to_le32(scsi_bufflen(SCpnt));
662
663 /* Now fill in the SGList and command */
664
665 if (scsi_sg_count(SCpnt)) {
666 if (!i2o_dma_map_sg(c, scsi_sglist(SCpnt),
667 scsi_sg_count(SCpnt),
668 SCpnt->sc_data_direction, &mptr))
669 goto nomem;
670 }
671 }
672
673 /* Stick the headers on */
674 msg->u.head[0] =
675 cpu_to_le32(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset);
676
677 /* Queue the message */
678 i2o_msg_post(c, msg);
679
680 osm_debug("Issued %0x%p\n", SCpnt);
681
682 return 0;
683
684 nomem:
685 rc = -ENOMEM;
686 i2o_msg_nop(c, msg);
687
688 exit:
689 return rc;
690 }
691
DEF_SCSI_QCMD(i2o_scsi_queuecommand)692 static DEF_SCSI_QCMD(i2o_scsi_queuecommand)
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
i2o_scsi_bios_param(struct scsi_device * sdev,struct block_device * dev,sector_t capacity,int * ip)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 */
i2o_scsi_init(void)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 */
i2o_scsi_exit(void)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