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1da177e4 LT |
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 | ||
f88e119c | 43 | #define DEBUG 1 |
1da177e4 LT |
44 | #include <linux/module.h> |
45 | #include <linux/kernel.h> | |
46 | #include <linux/types.h> | |
47 | #include <linux/string.h> | |
48 | #include <linux/ioport.h> | |
49 | #include <linux/jiffies.h> | |
50 | #include <linux/interrupt.h> | |
51 | #include <linux/timer.h> | |
52 | #include <linux/delay.h> | |
53 | #include <linux/proc_fs.h> | |
54 | #include <linux/prefetch.h> | |
55 | #include <linux/pci.h> | |
56 | #include <linux/blkdev.h> | |
57 | #include <linux/i2o.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 | ||
69 | #define OSM_NAME "scsi-osm" | |
70 | #define OSM_VERSION "$Rev$" | |
71 | #define OSM_DESCRIPTION "I2O SCSI Peripheral OSM" | |
72 | ||
73 | static struct i2o_driver i2o_scsi_driver; | |
74 | ||
75 | static int i2o_scsi_max_id = 16; | |
76 | static int i2o_scsi_max_lun = 8; | |
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 | struct i2o_device *channel[0]; /* channel->i2o_dev mapping table */ | |
82 | }; | |
83 | ||
84 | static struct scsi_host_template i2o_scsi_host_template; | |
85 | ||
86 | #define I2O_SCSI_CAN_QUEUE 4 | |
87 | ||
88 | /* SCSI OSM class handling definition */ | |
89 | static struct i2o_class_id i2o_scsi_class_id[] = { | |
90 | {I2O_CLASS_SCSI_PERIPHERAL}, | |
91 | {I2O_CLASS_END} | |
92 | }; | |
93 | ||
94 | static struct i2o_scsi_host *i2o_scsi_host_alloc(struct i2o_controller *c) | |
95 | { | |
96 | struct i2o_scsi_host *i2o_shost; | |
97 | struct i2o_device *i2o_dev; | |
98 | struct Scsi_Host *scsi_host; | |
99 | int max_channel = 0; | |
100 | u8 type; | |
101 | int i; | |
102 | size_t size; | |
103 | i2o_status_block *sb; | |
104 | ||
105 | list_for_each_entry(i2o_dev, &c->devices, list) | |
106 | if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER_PORT) { | |
61fbfa81 ML |
107 | if (i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1) |
108 | && (type == 0x01)) /* SCSI bus */ | |
1da177e4 LT |
109 | max_channel++; |
110 | } | |
111 | ||
112 | if (!max_channel) { | |
113 | osm_warn("no channels found on %s\n", c->name); | |
114 | return ERR_PTR(-EFAULT); | |
115 | } | |
116 | ||
117 | size = max_channel * sizeof(struct i2o_device *) | |
118 | + sizeof(struct i2o_scsi_host); | |
119 | ||
120 | scsi_host = scsi_host_alloc(&i2o_scsi_host_template, size); | |
121 | if (!scsi_host) { | |
122 | osm_warn("Could not allocate SCSI host\n"); | |
123 | return ERR_PTR(-ENOMEM); | |
124 | } | |
125 | ||
126 | scsi_host->max_channel = max_channel - 1; | |
127 | scsi_host->max_id = i2o_scsi_max_id; | |
128 | scsi_host->max_lun = i2o_scsi_max_lun; | |
129 | scsi_host->this_id = c->unit; | |
130 | ||
131 | sb = c->status_block.virt; | |
132 | ||
133 | scsi_host->sg_tablesize = (sb->inbound_frame_size - | |
134 | sizeof(struct i2o_message) / 4 - 6) / 2; | |
135 | ||
136 | i2o_shost = (struct i2o_scsi_host *)scsi_host->hostdata; | |
137 | i2o_shost->scsi_host = scsi_host; | |
138 | i2o_shost->iop = c; | |
139 | ||
140 | i = 0; | |
141 | list_for_each_entry(i2o_dev, &c->devices, list) | |
142 | if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER_PORT) { | |
143 | if (i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1) || (type == 1)) /* only SCSI bus */ | |
144 | i2o_shost->channel[i++] = i2o_dev; | |
145 | ||
146 | if (i >= max_channel) | |
147 | break; | |
148 | } | |
149 | ||
150 | return i2o_shost; | |
151 | }; | |
152 | ||
153 | /** | |
154 | * i2o_scsi_get_host - Get an I2O SCSI host | |
155 | * @c: I2O controller to for which to get the SCSI host | |
156 | * | |
157 | * If the I2O controller already exists as SCSI host, the SCSI host | |
158 | * is returned, otherwise the I2O controller is added to the SCSI | |
159 | * core. | |
160 | * | |
161 | * Returns pointer to the I2O SCSI host on success or NULL on failure. | |
162 | */ | |
163 | static struct i2o_scsi_host *i2o_scsi_get_host(struct i2o_controller *c) | |
164 | { | |
165 | return c->driver_data[i2o_scsi_driver.context]; | |
166 | }; | |
167 | ||
168 | /** | |
169 | * i2o_scsi_remove - Remove I2O device from SCSI core | |
170 | * @dev: device which should be removed | |
171 | * | |
172 | * Removes the I2O device from the SCSI core again. | |
173 | * | |
174 | * Returns 0 on success. | |
175 | */ | |
176 | static int i2o_scsi_remove(struct device *dev) | |
177 | { | |
178 | struct i2o_device *i2o_dev = to_i2o_device(dev); | |
179 | struct i2o_controller *c = i2o_dev->iop; | |
180 | struct i2o_scsi_host *i2o_shost; | |
181 | struct scsi_device *scsi_dev; | |
182 | ||
f88e119c ML |
183 | osm_info("device removed (TID: %03x)\n", i2o_dev->lct_data.tid); |
184 | ||
1da177e4 LT |
185 | i2o_shost = i2o_scsi_get_host(c); |
186 | ||
187 | shost_for_each_device(scsi_dev, i2o_shost->scsi_host) | |
188 | if (scsi_dev->hostdata == i2o_dev) { | |
189 | scsi_remove_device(scsi_dev); | |
190 | scsi_device_put(scsi_dev); | |
191 | break; | |
192 | } | |
193 | ||
194 | return 0; | |
195 | }; | |
196 | ||
197 | /** | |
198 | * i2o_scsi_probe - verify if dev is a I2O SCSI device and install it | |
199 | * @dev: device to verify if it is a I2O SCSI device | |
200 | * | |
201 | * Retrieve channel, id and lun for I2O device. If everthing goes well | |
202 | * register the I2O device as SCSI device on the I2O SCSI controller. | |
203 | * | |
204 | * Returns 0 on success or negative error code on failure. | |
205 | */ | |
206 | static int i2o_scsi_probe(struct device *dev) | |
207 | { | |
208 | struct i2o_device *i2o_dev = to_i2o_device(dev); | |
209 | struct i2o_controller *c = i2o_dev->iop; | |
210 | struct i2o_scsi_host *i2o_shost; | |
211 | struct Scsi_Host *scsi_host; | |
212 | struct i2o_device *parent; | |
213 | struct scsi_device *scsi_dev; | |
214 | u32 id; | |
215 | u64 lun; | |
216 | int channel = -1; | |
217 | int i; | |
218 | ||
219 | i2o_shost = i2o_scsi_get_host(c); | |
220 | if (!i2o_shost) | |
221 | return -EFAULT; | |
222 | ||
223 | scsi_host = i2o_shost->scsi_host; | |
224 | ||
225 | if (i2o_parm_field_get(i2o_dev, 0, 3, &id, 4) < 0) | |
226 | return -EFAULT; | |
227 | ||
228 | if (id >= scsi_host->max_id) { | |
229 | osm_warn("SCSI device id (%d) >= max_id of I2O host (%d)", id, | |
230 | scsi_host->max_id); | |
231 | return -EFAULT; | |
232 | } | |
233 | ||
234 | if (i2o_parm_field_get(i2o_dev, 0, 4, &lun, 8) < 0) | |
235 | return -EFAULT; | |
236 | if (lun >= scsi_host->max_lun) { | |
237 | osm_warn("SCSI device id (%d) >= max_lun of I2O host (%d)", | |
238 | (unsigned int)lun, scsi_host->max_lun); | |
239 | return -EFAULT; | |
240 | } | |
241 | ||
242 | parent = i2o_iop_find_device(c, i2o_dev->lct_data.parent_tid); | |
243 | if (!parent) { | |
244 | osm_warn("can not find parent of device %03x\n", | |
245 | i2o_dev->lct_data.tid); | |
246 | return -EFAULT; | |
247 | } | |
248 | ||
249 | for (i = 0; i <= i2o_shost->scsi_host->max_channel; i++) | |
250 | if (i2o_shost->channel[i] == parent) | |
251 | channel = i; | |
252 | ||
253 | if (channel == -1) { | |
254 | osm_warn("can not find channel of device %03x\n", | |
255 | i2o_dev->lct_data.tid); | |
256 | return -EFAULT; | |
257 | } | |
258 | ||
259 | scsi_dev = | |
260 | __scsi_add_device(i2o_shost->scsi_host, channel, id, lun, i2o_dev); | |
261 | ||
262 | if (!scsi_dev) { | |
263 | osm_warn("can not add SCSI device %03x\n", | |
264 | i2o_dev->lct_data.tid); | |
265 | return -EFAULT; | |
266 | } | |
267 | ||
f88e119c ML |
268 | osm_info("device added (TID: %03x) channel: %d, id: %d, lun: %d\n", |
269 | i2o_dev->lct_data.tid, channel, id, (unsigned int)lun); | |
1da177e4 LT |
270 | |
271 | return 0; | |
272 | }; | |
273 | ||
274 | static const char *i2o_scsi_info(struct Scsi_Host *SChost) | |
275 | { | |
276 | struct i2o_scsi_host *hostdata; | |
277 | hostdata = (struct i2o_scsi_host *)SChost->hostdata; | |
278 | return hostdata->iop->name; | |
279 | } | |
280 | ||
281 | /** | |
282 | * i2o_scsi_reply - SCSI OSM message reply handler | |
283 | * @c: controller issuing the reply | |
284 | * @m: message id for flushing | |
285 | * @msg: the message from the controller | |
286 | * | |
287 | * Process reply messages (interrupts in normal scsi controller think). | |
288 | * We can get a variety of messages to process. The normal path is | |
289 | * scsi command completions. We must also deal with IOP failures, | |
290 | * the reply to a bus reset and the reply to a LUN query. | |
291 | * | |
292 | * Returns 0 on success and if the reply should not be flushed or > 0 | |
293 | * on success and if the reply should be flushed. Returns negative error | |
294 | * code on failure and if the reply should be flushed. | |
295 | */ | |
296 | static int i2o_scsi_reply(struct i2o_controller *c, u32 m, | |
297 | struct i2o_message *msg) | |
298 | { | |
299 | struct scsi_cmnd *cmd; | |
300 | struct device *dev; | |
301 | u8 as, ds, st; | |
302 | ||
303 | cmd = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt)); | |
304 | ||
305 | if (msg->u.head[0] & (1 << 13)) { | |
306 | struct i2o_message __iomem *pmsg; /* preserved message */ | |
307 | u32 pm; | |
308 | int err = DID_ERROR; | |
309 | ||
310 | pm = le32_to_cpu(msg->body[3]); | |
311 | ||
312 | pmsg = i2o_msg_in_to_virt(c, pm); | |
313 | ||
314 | osm_err("IOP fail.\n"); | |
315 | osm_err("From %d To %d Cmd %d.\n", | |
316 | (msg->u.head[1] >> 12) & 0xFFF, | |
317 | msg->u.head[1] & 0xFFF, msg->u.head[1] >> 24); | |
318 | osm_err("Failure Code %d.\n", msg->body[0] >> 24); | |
319 | if (msg->body[0] & (1 << 16)) | |
320 | osm_err("Format error.\n"); | |
321 | if (msg->body[0] & (1 << 17)) | |
322 | osm_err("Path error.\n"); | |
323 | if (msg->body[0] & (1 << 18)) | |
324 | osm_err("Path State.\n"); | |
325 | if (msg->body[0] & (1 << 18)) | |
326 | { | |
327 | osm_err("Congestion.\n"); | |
328 | err = DID_BUS_BUSY; | |
329 | } | |
330 | ||
331 | osm_debug("Failing message is %p.\n", pmsg); | |
332 | ||
333 | cmd = i2o_cntxt_list_get(c, readl(&pmsg->u.s.tcntxt)); | |
334 | if (!cmd) | |
335 | return 1; | |
336 | ||
337 | cmd->result = err << 16; | |
338 | cmd->scsi_done(cmd); | |
339 | ||
340 | /* Now flush the message by making it a NOP */ | |
341 | i2o_msg_nop(c, pm); | |
342 | ||
343 | return 1; | |
344 | } | |
345 | ||
346 | /* | |
347 | * Low byte is device status, next is adapter status, | |
348 | * (then one byte reserved), then request status. | |
349 | */ | |
350 | ds = (u8) le32_to_cpu(msg->body[0]); | |
351 | as = (u8) (le32_to_cpu(msg->body[0]) >> 8); | |
352 | st = (u8) (le32_to_cpu(msg->body[0]) >> 24); | |
353 | ||
354 | /* | |
355 | * Is this a control request coming back - eg an abort ? | |
356 | */ | |
357 | ||
358 | if (!cmd) { | |
359 | if (st) | |
360 | osm_warn("SCSI abort: %08X", le32_to_cpu(msg->body[0])); | |
361 | osm_info("SCSI abort completed.\n"); | |
362 | return -EFAULT; | |
363 | } | |
364 | ||
365 | osm_debug("Completed %ld\n", cmd->serial_number); | |
366 | ||
367 | if (st) { | |
368 | u32 count, error; | |
369 | /* An error has occurred */ | |
370 | ||
371 | switch (st) { | |
372 | case 0x06: | |
373 | count = le32_to_cpu(msg->body[1]); | |
374 | if (count < cmd->underflow) { | |
375 | int i; | |
376 | ||
377 | osm_err("SCSI underflow 0x%08X 0x%08X\n", count, | |
378 | cmd->underflow); | |
379 | osm_debug("Cmd: "); | |
380 | for (i = 0; i < 15; i++) | |
381 | pr_debug("%02X ", cmd->cmnd[i]); | |
382 | pr_debug(".\n"); | |
383 | cmd->result = (DID_ERROR << 16); | |
384 | } | |
385 | break; | |
386 | ||
387 | default: | |
388 | error = le32_to_cpu(msg->body[0]); | |
389 | ||
390 | osm_err("SCSI error %08x\n", error); | |
391 | ||
392 | if ((error & 0xff) == 0x02 /*CHECK_CONDITION */ ) { | |
393 | int i; | |
394 | u32 len = sizeof(cmd->sense_buffer); | |
395 | len = (len > 40) ? 40 : len; | |
396 | // Copy over the sense data | |
397 | memcpy(cmd->sense_buffer, (void *)&msg->body[3], | |
398 | len); | |
399 | for (i = 0; i <= len; i++) | |
400 | osm_info("%02x\n", | |
401 | cmd->sense_buffer[i]); | |
402 | if (cmd->sense_buffer[0] == 0x70 | |
403 | && cmd->sense_buffer[2] == DATA_PROTECT) { | |
404 | /* This is to handle an array failed */ | |
405 | cmd->result = (DID_TIME_OUT << 16); | |
406 | printk(KERN_WARNING "%s: SCSI Data " | |
407 | "Protect-Device (%d,%d,%d) " | |
408 | "hba_status=0x%x, dev_status=" | |
409 | "0x%x, cmd=0x%x\n", c->name, | |
410 | (u32) cmd->device->channel, | |
411 | (u32) cmd->device->id, | |
412 | (u32) cmd->device->lun, | |
413 | (error >> 8) & 0xff, | |
414 | error & 0xff, cmd->cmnd[0]); | |
415 | } else | |
416 | cmd->result = (DID_ERROR << 16); | |
417 | ||
418 | break; | |
419 | } | |
420 | ||
421 | switch (as) { | |
422 | case 0x0E: | |
423 | /* SCSI Reset */ | |
424 | cmd->result = DID_RESET << 16; | |
425 | break; | |
426 | ||
427 | case 0x0F: | |
428 | cmd->result = DID_PARITY << 16; | |
429 | break; | |
430 | ||
431 | default: | |
432 | cmd->result = DID_ERROR << 16; | |
433 | break; | |
434 | } | |
435 | ||
436 | break; | |
437 | } | |
438 | ||
439 | cmd->scsi_done(cmd); | |
440 | return 1; | |
441 | } | |
442 | ||
443 | cmd->result = DID_OK << 16 | ds; | |
444 | ||
1da177e4 LT |
445 | dev = &c->pdev->dev; |
446 | if (cmd->use_sg) | |
447 | dma_unmap_sg(dev, (struct scatterlist *)cmd->buffer, | |
448 | cmd->use_sg, cmd->sc_data_direction); | |
449 | else if (cmd->request_bufflen) | |
450 | dma_unmap_single(dev, (dma_addr_t) ((long)cmd->SCp.ptr), | |
451 | cmd->request_bufflen, cmd->sc_data_direction); | |
452 | ||
f88e119c ML |
453 | cmd->scsi_done(cmd); |
454 | ||
1da177e4 LT |
455 | return 1; |
456 | }; | |
457 | ||
458 | /** | |
459 | * i2o_scsi_notify_controller_add - Retrieve notifications of added | |
460 | * controllers | |
461 | * @c: the controller which was added | |
462 | * | |
463 | * If a I2O controller is added, we catch the notification to add a | |
464 | * corresponding Scsi_Host. | |
465 | */ | |
466 | static void i2o_scsi_notify_controller_add(struct i2o_controller *c) | |
467 | { | |
468 | struct i2o_scsi_host *i2o_shost; | |
469 | int rc; | |
470 | ||
471 | i2o_shost = i2o_scsi_host_alloc(c); | |
472 | if (IS_ERR(i2o_shost)) { | |
473 | osm_err("Could not initialize SCSI host\n"); | |
474 | return; | |
475 | } | |
476 | ||
477 | rc = scsi_add_host(i2o_shost->scsi_host, &c->device); | |
478 | if (rc) { | |
479 | osm_err("Could not add SCSI host\n"); | |
480 | scsi_host_put(i2o_shost->scsi_host); | |
481 | return; | |
482 | } | |
483 | ||
484 | c->driver_data[i2o_scsi_driver.context] = i2o_shost; | |
485 | ||
486 | osm_debug("new I2O SCSI host added\n"); | |
487 | }; | |
488 | ||
489 | /** | |
490 | * i2o_scsi_notify_controller_remove - Retrieve notifications of removed | |
491 | * controllers | |
492 | * @c: the controller which was removed | |
493 | * | |
494 | * If a I2O controller is removed, we catch the notification to remove the | |
495 | * corresponding Scsi_Host. | |
496 | */ | |
497 | static void i2o_scsi_notify_controller_remove(struct i2o_controller *c) | |
498 | { | |
499 | struct i2o_scsi_host *i2o_shost; | |
500 | i2o_shost = i2o_scsi_get_host(c); | |
501 | if (!i2o_shost) | |
502 | return; | |
503 | ||
504 | c->driver_data[i2o_scsi_driver.context] = NULL; | |
505 | ||
506 | scsi_remove_host(i2o_shost->scsi_host); | |
507 | scsi_host_put(i2o_shost->scsi_host); | |
f88e119c | 508 | osm_debug("I2O SCSI host removed\n"); |
1da177e4 LT |
509 | }; |
510 | ||
511 | /* SCSI OSM driver struct */ | |
512 | static struct i2o_driver i2o_scsi_driver = { | |
513 | .name = OSM_NAME, | |
514 | .reply = i2o_scsi_reply, | |
515 | .classes = i2o_scsi_class_id, | |
516 | .notify_controller_add = i2o_scsi_notify_controller_add, | |
517 | .notify_controller_remove = i2o_scsi_notify_controller_remove, | |
518 | .driver = { | |
519 | .probe = i2o_scsi_probe, | |
520 | .remove = i2o_scsi_remove, | |
521 | }, | |
522 | }; | |
523 | ||
524 | /** | |
525 | * i2o_scsi_queuecommand - queue a SCSI command | |
526 | * @SCpnt: scsi command pointer | |
527 | * @done: callback for completion | |
528 | * | |
529 | * Issue a scsi command asynchronously. Return 0 on success or 1 if | |
530 | * we hit an error (normally message queue congestion). The only | |
531 | * minor complication here is that I2O deals with the device addressing | |
532 | * so we have to map the bus/dev/lun back to an I2O handle as well | |
533 | * as faking absent devices ourself. | |
534 | * | |
535 | * Locks: takes the controller lock on error path only | |
536 | */ | |
537 | ||
538 | static int i2o_scsi_queuecommand(struct scsi_cmnd *SCpnt, | |
539 | void (*done) (struct scsi_cmnd *)) | |
540 | { | |
541 | struct i2o_controller *c; | |
542 | struct Scsi_Host *host; | |
543 | struct i2o_device *i2o_dev; | |
544 | struct device *dev; | |
545 | int tid; | |
546 | struct i2o_message __iomem *msg; | |
547 | u32 m; | |
548 | u32 scsi_flags, sg_flags; | |
549 | u32 __iomem *mptr; | |
550 | u32 __iomem *lenptr; | |
f88e119c | 551 | u32 len; |
1da177e4 LT |
552 | int i; |
553 | ||
554 | /* | |
555 | * Do the incoming paperwork | |
556 | */ | |
557 | ||
558 | i2o_dev = SCpnt->device->hostdata; | |
559 | host = SCpnt->device->host; | |
560 | c = i2o_dev->iop; | |
561 | dev = &c->pdev->dev; | |
562 | ||
563 | SCpnt->scsi_done = done; | |
564 | ||
565 | if (unlikely(!i2o_dev)) { | |
566 | osm_warn("no I2O device in request\n"); | |
567 | SCpnt->result = DID_NO_CONNECT << 16; | |
568 | done(SCpnt); | |
569 | return 0; | |
570 | } | |
571 | ||
572 | tid = i2o_dev->lct_data.tid; | |
573 | ||
574 | osm_debug("qcmd: Tid = %03x\n", tid); | |
575 | osm_debug("Real scsi messages.\n"); | |
576 | ||
577 | /* | |
578 | * Obtain an I2O message. If there are none free then | |
579 | * throw it back to the scsi layer | |
580 | */ | |
581 | ||
582 | m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET); | |
583 | if (m == I2O_QUEUE_EMPTY) | |
584 | return SCSI_MLQUEUE_HOST_BUSY; | |
585 | ||
f88e119c ML |
586 | mptr = &msg->body[0]; |
587 | ||
1da177e4 LT |
588 | /* |
589 | * Put together a scsi execscb message | |
590 | */ | |
591 | ||
1da177e4 LT |
592 | switch (SCpnt->sc_data_direction) { |
593 | case PCI_DMA_NONE: | |
594 | scsi_flags = 0x00000000; // DATA NO XFER | |
595 | sg_flags = 0x00000000; | |
596 | break; | |
597 | ||
598 | case PCI_DMA_TODEVICE: | |
599 | scsi_flags = 0x80000000; // DATA OUT (iop-->dev) | |
600 | sg_flags = 0x14000000; | |
601 | break; | |
602 | ||
603 | case PCI_DMA_FROMDEVICE: | |
604 | scsi_flags = 0x40000000; // DATA IN (iop<--dev) | |
605 | sg_flags = 0x10000000; | |
606 | break; | |
607 | ||
608 | default: | |
609 | /* Unknown - kill the command */ | |
610 | SCpnt->result = DID_NO_CONNECT << 16; | |
611 | done(SCpnt); | |
612 | return 0; | |
613 | } | |
614 | ||
615 | writel(I2O_CMD_SCSI_EXEC << 24 | HOST_TID << 12 | tid, &msg->u.head[1]); | |
616 | writel(i2o_scsi_driver.context, &msg->u.s.icntxt); | |
617 | ||
618 | /* We want the SCSI control block back */ | |
619 | writel(i2o_cntxt_list_add(c, SCpnt), &msg->u.s.tcntxt); | |
620 | ||
621 | /* LSI_920_PCI_QUIRK | |
622 | * | |
623 | * Intermittant observations of msg frame word data corruption | |
624 | * observed on msg[4] after: | |
625 | * WRITE, READ-MODIFY-WRITE | |
626 | * operations. 19990606 -sralston | |
627 | * | |
628 | * (Hence we build this word via tag. Its good practice anyway | |
629 | * we don't want fetches over PCI needlessly) | |
630 | */ | |
631 | ||
632 | /* Attach tags to the devices */ | |
633 | /* | |
634 | if(SCpnt->device->tagged_supported) { | |
635 | if(SCpnt->tag == HEAD_OF_QUEUE_TAG) | |
636 | scsi_flags |= 0x01000000; | |
637 | else if(SCpnt->tag == ORDERED_QUEUE_TAG) | |
638 | scsi_flags |= 0x01800000; | |
639 | } | |
640 | */ | |
641 | ||
642 | /* Direction, disconnect ok, tag, CDBLen */ | |
f88e119c | 643 | writel(scsi_flags | 0x20200000 | SCpnt->cmd_len, mptr ++); |
1da177e4 LT |
644 | |
645 | /* Write SCSI command into the message - always 16 byte block */ | |
646 | memcpy_toio(mptr, SCpnt->cmnd, 16); | |
647 | mptr += 4; | |
648 | lenptr = mptr++; /* Remember me - fill in when we know */ | |
649 | ||
1da177e4 LT |
650 | /* Now fill in the SGList and command */ |
651 | if (SCpnt->use_sg) { | |
652 | struct scatterlist *sg; | |
653 | int sg_count; | |
654 | ||
655 | sg = SCpnt->request_buffer; | |
656 | len = 0; | |
657 | ||
658 | sg_count = dma_map_sg(dev, sg, SCpnt->use_sg, | |
659 | SCpnt->sc_data_direction); | |
660 | ||
661 | if (unlikely(sg_count <= 0)) | |
662 | return -ENOMEM; | |
663 | ||
664 | for (i = SCpnt->use_sg; i > 0; i--) { | |
665 | if (i == 1) | |
666 | sg_flags |= 0xC0000000; | |
667 | writel(sg_flags | sg_dma_len(sg), mptr++); | |
668 | writel(sg_dma_address(sg), mptr++); | |
669 | len += sg_dma_len(sg); | |
670 | sg++; | |
671 | } | |
672 | ||
1da177e4 LT |
673 | writel(len, lenptr); |
674 | } else { | |
675 | len = SCpnt->request_bufflen; | |
676 | ||
677 | writel(len, lenptr); | |
678 | ||
679 | if (len > 0) { | |
680 | dma_addr_t dma_addr; | |
681 | ||
682 | dma_addr = dma_map_single(dev, SCpnt->request_buffer, | |
683 | SCpnt->request_bufflen, | |
684 | SCpnt->sc_data_direction); | |
685 | if (!dma_addr) | |
686 | return -ENOMEM; | |
687 | ||
688 | SCpnt->SCp.ptr = (void *)(unsigned long)dma_addr; | |
689 | sg_flags |= 0xC0000000; | |
690 | writel(sg_flags | SCpnt->request_bufflen, mptr++); | |
691 | writel(dma_addr, mptr++); | |
f88e119c | 692 | } |
1da177e4 LT |
693 | } |
694 | ||
695 | /* Stick the headers on */ | |
f88e119c | 696 | writel((mptr - &msg->u.head[0]) << 16 | SGL_OFFSET_10, &msg->u.head[0]); |
1da177e4 LT |
697 | |
698 | /* Queue the message */ | |
699 | i2o_msg_post(c, m); | |
700 | ||
701 | osm_debug("Issued %ld\n", SCpnt->serial_number); | |
702 | ||
703 | return 0; | |
704 | }; | |
705 | ||
706 | /** | |
707 | * i2o_scsi_abort - abort a running command | |
708 | * @SCpnt: command to abort | |
709 | * | |
710 | * Ask the I2O controller to abort a command. This is an asynchrnous | |
711 | * process and our callback handler will see the command complete with an | |
712 | * aborted message if it succeeds. | |
713 | * | |
714 | * Returns 0 if the command is successfully aborted or negative error code | |
715 | * on failure. | |
716 | */ | |
717 | static int i2o_scsi_abort(struct scsi_cmnd *SCpnt) | |
718 | { | |
719 | struct i2o_device *i2o_dev; | |
720 | struct i2o_controller *c; | |
721 | struct i2o_message __iomem *msg; | |
722 | u32 m; | |
723 | int tid; | |
724 | int status = FAILED; | |
725 | ||
726 | osm_warn("Aborting command block.\n"); | |
727 | ||
728 | i2o_dev = SCpnt->device->hostdata; | |
729 | c = i2o_dev->iop; | |
730 | tid = i2o_dev->lct_data.tid; | |
731 | ||
732 | m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET); | |
733 | if (m == I2O_QUEUE_EMPTY) | |
734 | return SCSI_MLQUEUE_HOST_BUSY; | |
735 | ||
736 | writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); | |
737 | writel(I2O_CMD_SCSI_ABORT << 24 | HOST_TID << 12 | tid, | |
738 | &msg->u.head[1]); | |
739 | writel(i2o_cntxt_list_get_ptr(c, SCpnt), &msg->body[0]); | |
740 | ||
741 | if (i2o_msg_post_wait(c, m, I2O_TIMEOUT_SCSI_SCB_ABORT)) | |
742 | status = SUCCESS; | |
743 | ||
744 | return status; | |
745 | } | |
746 | ||
747 | /** | |
748 | * i2o_scsi_bios_param - Invent disk geometry | |
749 | * @sdev: scsi device | |
750 | * @dev: block layer device | |
751 | * @capacity: size in sectors | |
752 | * @ip: geometry array | |
753 | * | |
754 | * This is anyones guess quite frankly. We use the same rules everyone | |
755 | * else appears to and hope. It seems to work. | |
756 | */ | |
757 | ||
758 | static int i2o_scsi_bios_param(struct scsi_device *sdev, | |
759 | struct block_device *dev, sector_t capacity, | |
760 | int *ip) | |
761 | { | |
762 | int size; | |
763 | ||
764 | size = capacity; | |
765 | ip[0] = 64; /* heads */ | |
766 | ip[1] = 32; /* sectors */ | |
767 | if ((ip[2] = size >> 11) > 1024) { /* cylinders, test for big disk */ | |
768 | ip[0] = 255; /* heads */ | |
769 | ip[1] = 63; /* sectors */ | |
770 | ip[2] = size / (255 * 63); /* cylinders */ | |
771 | } | |
772 | return 0; | |
773 | } | |
774 | ||
775 | static struct scsi_host_template i2o_scsi_host_template = { | |
776 | .proc_name = OSM_NAME, | |
777 | .name = OSM_DESCRIPTION, | |
778 | .info = i2o_scsi_info, | |
779 | .queuecommand = i2o_scsi_queuecommand, | |
780 | .eh_abort_handler = i2o_scsi_abort, | |
781 | .bios_param = i2o_scsi_bios_param, | |
782 | .can_queue = I2O_SCSI_CAN_QUEUE, | |
783 | .sg_tablesize = 8, | |
784 | .cmd_per_lun = 6, | |
785 | .use_clustering = ENABLE_CLUSTERING, | |
786 | }; | |
787 | ||
788 | /** | |
789 | * i2o_scsi_init - SCSI OSM initialization function | |
790 | * | |
791 | * Register SCSI OSM into I2O core. | |
792 | * | |
793 | * Returns 0 on success or negative error code on failure. | |
794 | */ | |
795 | static int __init i2o_scsi_init(void) | |
796 | { | |
797 | int rc; | |
798 | ||
799 | printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n"); | |
800 | ||
801 | /* Register SCSI OSM into I2O core */ | |
802 | rc = i2o_driver_register(&i2o_scsi_driver); | |
803 | if (rc) { | |
804 | osm_err("Could not register SCSI driver\n"); | |
805 | return rc; | |
806 | } | |
807 | ||
808 | return 0; | |
809 | }; | |
810 | ||
811 | /** | |
812 | * i2o_scsi_exit - SCSI OSM exit function | |
813 | * | |
814 | * Unregisters SCSI OSM from I2O core. | |
815 | */ | |
816 | static void __exit i2o_scsi_exit(void) | |
817 | { | |
818 | /* Unregister I2O SCSI OSM from I2O core */ | |
819 | i2o_driver_unregister(&i2o_scsi_driver); | |
820 | }; | |
821 | ||
822 | MODULE_AUTHOR("Red Hat Software"); | |
823 | MODULE_LICENSE("GPL"); | |
824 | MODULE_DESCRIPTION(OSM_DESCRIPTION); | |
825 | MODULE_VERSION(OSM_VERSION); | |
826 | ||
827 | module_init(i2o_scsi_init); | |
828 | module_exit(i2o_scsi_exit); |