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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 | ||
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> | |
b2aaee33 | 57 | #include <linux/scatterlist.h> |
1da177e4 LT |
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> | |
b2aaee33 ML |
68 | #include <scsi/scsi_request.h> |
69 | #include <scsi/sg.h> | |
70 | #include <scsi/sg_request.h> | |
1da177e4 LT |
71 | |
72 | #define OSM_NAME "scsi-osm" | |
b2aaee33 | 73 | #define OSM_VERSION "1.282" |
1da177e4 LT |
74 | #define OSM_DESCRIPTION "I2O SCSI Peripheral OSM" |
75 | ||
76 | static struct i2o_driver i2o_scsi_driver; | |
77 | ||
b2aaee33 ML |
78 | static unsigned int i2o_scsi_max_id = 16; |
79 | static unsigned int i2o_scsi_max_lun = 255; | |
1da177e4 LT |
80 | |
81 | struct i2o_scsi_host { | |
82 | struct Scsi_Host *scsi_host; /* pointer to the SCSI host */ | |
83 | struct i2o_controller *iop; /* pointer to the I2O controller */ | |
b2aaee33 | 84 | unsigned int lun; /* lun's used for block devices */ |
1da177e4 LT |
85 | struct i2o_device *channel[0]; /* channel->i2o_dev mapping table */ |
86 | }; | |
87 | ||
88 | static struct scsi_host_template i2o_scsi_host_template; | |
89 | ||
90 | #define I2O_SCSI_CAN_QUEUE 4 | |
91 | ||
92 | /* SCSI OSM class handling definition */ | |
93 | static struct i2o_class_id i2o_scsi_class_id[] = { | |
94 | {I2O_CLASS_SCSI_PERIPHERAL}, | |
95 | {I2O_CLASS_END} | |
96 | }; | |
97 | ||
98 | static struct i2o_scsi_host *i2o_scsi_host_alloc(struct i2o_controller *c) | |
99 | { | |
100 | struct i2o_scsi_host *i2o_shost; | |
101 | struct i2o_device *i2o_dev; | |
102 | struct Scsi_Host *scsi_host; | |
103 | int max_channel = 0; | |
104 | u8 type; | |
105 | int i; | |
106 | size_t size; | |
b2aaee33 ML |
107 | u16 body_size = 6; |
108 | ||
109 | #ifdef CONFIG_I2O_EXT_ADAPTEC | |
110 | if (c->adaptec) | |
111 | body_size = 8; | |
112 | #endif | |
1da177e4 LT |
113 | |
114 | list_for_each_entry(i2o_dev, &c->devices, list) | |
f10378ff | 115 | if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER) { |
61fbfa81 | 116 | if (i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1) |
b2aaee33 | 117 | && (type == 0x01)) /* SCSI bus */ |
1da177e4 LT |
118 | max_channel++; |
119 | } | |
120 | ||
121 | if (!max_channel) { | |
122 | osm_warn("no channels found on %s\n", c->name); | |
123 | return ERR_PTR(-EFAULT); | |
124 | } | |
125 | ||
126 | size = max_channel * sizeof(struct i2o_device *) | |
127 | + sizeof(struct i2o_scsi_host); | |
128 | ||
129 | scsi_host = scsi_host_alloc(&i2o_scsi_host_template, size); | |
130 | if (!scsi_host) { | |
131 | osm_warn("Could not allocate SCSI host\n"); | |
132 | return ERR_PTR(-ENOMEM); | |
133 | } | |
134 | ||
135 | scsi_host->max_channel = max_channel - 1; | |
136 | scsi_host->max_id = i2o_scsi_max_id; | |
137 | scsi_host->max_lun = i2o_scsi_max_lun; | |
138 | scsi_host->this_id = c->unit; | |
b2aaee33 | 139 | scsi_host->sg_tablesize = i2o_sg_tablesize(c, body_size); |
1da177e4 LT |
140 | |
141 | i2o_shost = (struct i2o_scsi_host *)scsi_host->hostdata; | |
142 | i2o_shost->scsi_host = scsi_host; | |
143 | i2o_shost->iop = c; | |
b2aaee33 | 144 | i2o_shost->lun = 1; |
1da177e4 LT |
145 | |
146 | i = 0; | |
147 | list_for_each_entry(i2o_dev, &c->devices, list) | |
f10378ff | 148 | if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER) { |
b2aaee33 ML |
149 | if (i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1) |
150 | && (type == 0x01)) /* only SCSI bus */ | |
1da177e4 LT |
151 | i2o_shost->channel[i++] = i2o_dev; |
152 | ||
153 | if (i >= max_channel) | |
154 | break; | |
155 | } | |
156 | ||
157 | return i2o_shost; | |
158 | }; | |
159 | ||
160 | /** | |
161 | * i2o_scsi_get_host - Get an I2O SCSI host | |
162 | * @c: I2O controller to for which to get the SCSI host | |
163 | * | |
164 | * If the I2O controller already exists as SCSI host, the SCSI host | |
165 | * is returned, otherwise the I2O controller is added to the SCSI | |
166 | * core. | |
167 | * | |
168 | * Returns pointer to the I2O SCSI host on success or NULL on failure. | |
169 | */ | |
170 | static struct i2o_scsi_host *i2o_scsi_get_host(struct i2o_controller *c) | |
171 | { | |
172 | return c->driver_data[i2o_scsi_driver.context]; | |
173 | }; | |
174 | ||
175 | /** | |
176 | * i2o_scsi_remove - Remove I2O device from SCSI core | |
177 | * @dev: device which should be removed | |
178 | * | |
179 | * Removes the I2O device from the SCSI core again. | |
180 | * | |
181 | * Returns 0 on success. | |
182 | */ | |
183 | static int i2o_scsi_remove(struct device *dev) | |
184 | { | |
185 | struct i2o_device *i2o_dev = to_i2o_device(dev); | |
186 | struct i2o_controller *c = i2o_dev->iop; | |
187 | struct i2o_scsi_host *i2o_shost; | |
188 | struct scsi_device *scsi_dev; | |
189 | ||
f88e119c ML |
190 | osm_info("device removed (TID: %03x)\n", i2o_dev->lct_data.tid); |
191 | ||
1da177e4 LT |
192 | i2o_shost = i2o_scsi_get_host(c); |
193 | ||
194 | shost_for_each_device(scsi_dev, i2o_shost->scsi_host) | |
195 | if (scsi_dev->hostdata == i2o_dev) { | |
f10378ff | 196 | sysfs_remove_link(&i2o_dev->device.kobj, "scsi"); |
1da177e4 LT |
197 | scsi_remove_device(scsi_dev); |
198 | scsi_device_put(scsi_dev); | |
199 | break; | |
200 | } | |
201 | ||
202 | return 0; | |
203 | }; | |
204 | ||
205 | /** | |
206 | * i2o_scsi_probe - verify if dev is a I2O SCSI device and install it | |
207 | * @dev: device to verify if it is a I2O SCSI device | |
208 | * | |
209 | * Retrieve channel, id and lun for I2O device. If everthing goes well | |
210 | * register the I2O device as SCSI device on the I2O SCSI controller. | |
211 | * | |
212 | * Returns 0 on success or negative error code on failure. | |
213 | */ | |
214 | static int i2o_scsi_probe(struct device *dev) | |
215 | { | |
216 | struct i2o_device *i2o_dev = to_i2o_device(dev); | |
217 | struct i2o_controller *c = i2o_dev->iop; | |
218 | struct i2o_scsi_host *i2o_shost; | |
219 | struct Scsi_Host *scsi_host; | |
220 | struct i2o_device *parent; | |
221 | struct scsi_device *scsi_dev; | |
b2aaee33 ML |
222 | u32 id = -1; |
223 | u64 lun = -1; | |
1da177e4 LT |
224 | int channel = -1; |
225 | int i; | |
226 | ||
227 | i2o_shost = i2o_scsi_get_host(c); | |
228 | if (!i2o_shost) | |
229 | return -EFAULT; | |
230 | ||
231 | scsi_host = i2o_shost->scsi_host; | |
232 | ||
b2aaee33 ML |
233 | switch (i2o_dev->lct_data.class_id) { |
234 | case I2O_CLASS_RANDOM_BLOCK_STORAGE: | |
235 | case I2O_CLASS_EXECUTIVE: | |
236 | #ifdef CONFIG_I2O_EXT_ADAPTEC | |
237 | if (c->adaptec) { | |
238 | u8 type; | |
239 | struct i2o_device *d = i2o_shost->channel[0]; | |
240 | ||
241 | if (i2o_parm_field_get(d, 0x0000, 0, &type, 1) | |
242 | && (type == 0x01)) /* SCSI bus */ | |
243 | if (i2o_parm_field_get(d, 0x0200, 4, &id, 4)) { | |
244 | channel = 0; | |
245 | if (i2o_dev->lct_data.class_id == | |
246 | I2O_CLASS_RANDOM_BLOCK_STORAGE) | |
247 | lun = i2o_shost->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) < 0) | |
257 | return -EFAULT; | |
258 | ||
259 | if (i2o_parm_field_get(i2o_dev, 0x0000, 4, &lun, 8) < 0) | |
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); | |
1da177e4 | 281 | return -EFAULT; |
b2aaee33 | 282 | } |
1da177e4 LT |
283 | |
284 | if (id >= scsi_host->max_id) { | |
285 | osm_warn("SCSI device id (%d) >= max_id of I2O host (%d)", id, | |
286 | scsi_host->max_id); | |
287 | return -EFAULT; | |
288 | } | |
289 | ||
1da177e4 LT |
290 | if (lun >= scsi_host->max_lun) { |
291 | osm_warn("SCSI device id (%d) >= max_lun of I2O host (%d)", | |
292 | (unsigned int)lun, scsi_host->max_lun); | |
293 | return -EFAULT; | |
294 | } | |
295 | ||
1da177e4 LT |
296 | scsi_dev = |
297 | __scsi_add_device(i2o_shost->scsi_host, channel, id, lun, i2o_dev); | |
298 | ||
f10378ff | 299 | if (IS_ERR(scsi_dev)) { |
1da177e4 LT |
300 | osm_warn("can not add SCSI device %03x\n", |
301 | i2o_dev->lct_data.tid); | |
f10378ff | 302 | return PTR_ERR(scsi_dev); |
1da177e4 LT |
303 | } |
304 | ||
b2aaee33 ML |
305 | sysfs_create_link(&i2o_dev->device.kobj, &scsi_dev->sdev_gendev.kobj, |
306 | "scsi"); | |
f10378ff | 307 | |
f88e119c ML |
308 | osm_info("device added (TID: %03x) channel: %d, id: %d, lun: %d\n", |
309 | i2o_dev->lct_data.tid, channel, id, (unsigned int)lun); | |
1da177e4 LT |
310 | |
311 | return 0; | |
312 | }; | |
313 | ||
314 | static const char *i2o_scsi_info(struct Scsi_Host *SChost) | |
315 | { | |
316 | struct i2o_scsi_host *hostdata; | |
317 | hostdata = (struct i2o_scsi_host *)SChost->hostdata; | |
318 | return hostdata->iop->name; | |
319 | } | |
320 | ||
321 | /** | |
322 | * i2o_scsi_reply - SCSI OSM message reply handler | |
323 | * @c: controller issuing the reply | |
324 | * @m: message id for flushing | |
325 | * @msg: the message from the controller | |
326 | * | |
327 | * Process reply messages (interrupts in normal scsi controller think). | |
328 | * We can get a variety of messages to process. The normal path is | |
329 | * scsi command completions. We must also deal with IOP failures, | |
330 | * the reply to a bus reset and the reply to a LUN query. | |
331 | * | |
332 | * Returns 0 on success and if the reply should not be flushed or > 0 | |
333 | * on success and if the reply should be flushed. Returns negative error | |
334 | * code on failure and if the reply should be flushed. | |
335 | */ | |
336 | static int i2o_scsi_reply(struct i2o_controller *c, u32 m, | |
337 | struct i2o_message *msg) | |
338 | { | |
339 | struct scsi_cmnd *cmd; | |
9e87545f | 340 | u32 error; |
1da177e4 | 341 | struct device *dev; |
1da177e4 LT |
342 | |
343 | cmd = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt)); | |
9e87545f ML |
344 | if (unlikely(!cmd)) { |
345 | osm_err("NULL reply received!\n"); | |
346 | return -1; | |
1da177e4 LT |
347 | } |
348 | ||
349 | /* | |
350 | * Low byte is device status, next is adapter status, | |
351 | * (then one byte reserved), then request status. | |
352 | */ | |
9e87545f | 353 | error = le32_to_cpu(msg->body[0]); |
1da177e4 | 354 | |
9e87545f ML |
355 | osm_debug("Completed %ld\n", cmd->serial_number); |
356 | ||
357 | cmd->result = error & 0xff; | |
1da177e4 | 358 | /* |
9e87545f ML |
359 | * if DeviceStatus is not SCSI_SUCCESS copy over the sense data and let |
360 | * the SCSI layer handle the error | |
1da177e4 | 361 | */ |
9e87545f ML |
362 | if (cmd->result) |
363 | memcpy(cmd->sense_buffer, &msg->body[3], | |
364 | min(sizeof(cmd->sense_buffer), (size_t) 40)); | |
1da177e4 | 365 | |
9e87545f ML |
366 | /* only output error code if AdapterStatus is not HBA_SUCCESS */ |
367 | if ((error >> 8) & 0xff) | |
368 | osm_err("SCSI error %08x\n", error); | |
1da177e4 | 369 | |
9e87545f ML |
370 | dev = &c->pdev->dev; |
371 | if (cmd->use_sg) | |
372 | dma_unmap_sg(dev, cmd->request_buffer, cmd->use_sg, | |
373 | cmd->sc_data_direction); | |
374 | else if (cmd->SCp.dma_handle) | |
375 | dma_unmap_single(dev, cmd->SCp.dma_handle, cmd->request_bufflen, | |
376 | cmd->sc_data_direction); | |
1da177e4 | 377 | |
9e87545f | 378 | cmd->scsi_done(cmd); |
1da177e4 | 379 | |
9e87545f ML |
380 | return 1; |
381 | }; | |
1da177e4 | 382 | |
9e87545f ML |
383 | /** |
384 | * i2o_scsi_notify_device_add - Retrieve notifications of added devices | |
385 | * @i2o_dev: the I2O device which was added | |
386 | * | |
387 | * If a I2O device is added we catch the notification, because I2O classes | |
388 | * other then SCSI peripheral will not be received through | |
389 | * i2o_scsi_probe(). | |
390 | */ | |
391 | static void i2o_scsi_notify_device_add(struct i2o_device *i2o_dev) | |
392 | { | |
393 | switch (i2o_dev->lct_data.class_id) { | |
394 | case I2O_CLASS_EXECUTIVE: | |
395 | case I2O_CLASS_RANDOM_BLOCK_STORAGE: | |
396 | i2o_scsi_probe(&i2o_dev->device); | |
397 | break; | |
1da177e4 | 398 | |
9e87545f ML |
399 | default: |
400 | break; | |
1da177e4 | 401 | } |
9e87545f | 402 | }; |
1da177e4 | 403 | |
9e87545f ML |
404 | /** |
405 | * i2o_scsi_notify_device_remove - Retrieve notifications of removed | |
406 | * devices | |
407 | * @i2o_dev: the I2O device which was removed | |
408 | * | |
409 | * If a I2O device is removed, we catch the notification to remove the | |
410 | * corresponding SCSI device. | |
411 | */ | |
412 | static void i2o_scsi_notify_device_remove(struct i2o_device *i2o_dev) | |
413 | { | |
414 | switch (i2o_dev->lct_data.class_id) { | |
415 | case I2O_CLASS_EXECUTIVE: | |
416 | case I2O_CLASS_RANDOM_BLOCK_STORAGE: | |
417 | i2o_scsi_remove(&i2o_dev->device); | |
418 | break; | |
f88e119c | 419 | |
9e87545f ML |
420 | default: |
421 | break; | |
422 | } | |
1da177e4 LT |
423 | }; |
424 | ||
425 | /** | |
426 | * i2o_scsi_notify_controller_add - Retrieve notifications of added | |
427 | * controllers | |
428 | * @c: the controller which was added | |
429 | * | |
430 | * If a I2O controller is added, we catch the notification to add a | |
431 | * corresponding Scsi_Host. | |
432 | */ | |
433 | static void i2o_scsi_notify_controller_add(struct i2o_controller *c) | |
434 | { | |
435 | struct i2o_scsi_host *i2o_shost; | |
436 | int rc; | |
437 | ||
438 | i2o_shost = i2o_scsi_host_alloc(c); | |
439 | if (IS_ERR(i2o_shost)) { | |
440 | osm_err("Could not initialize SCSI host\n"); | |
441 | return; | |
442 | } | |
443 | ||
444 | rc = scsi_add_host(i2o_shost->scsi_host, &c->device); | |
445 | if (rc) { | |
446 | osm_err("Could not add SCSI host\n"); | |
447 | scsi_host_put(i2o_shost->scsi_host); | |
448 | return; | |
449 | } | |
450 | ||
451 | c->driver_data[i2o_scsi_driver.context] = i2o_shost; | |
452 | ||
453 | osm_debug("new I2O SCSI host added\n"); | |
454 | }; | |
455 | ||
456 | /** | |
457 | * i2o_scsi_notify_controller_remove - Retrieve notifications of removed | |
458 | * 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 | */ | |
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); | |
f88e119c | 475 | osm_debug("I2O SCSI host removed\n"); |
1da177e4 LT |
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, | |
9e87545f ML |
483 | .notify_device_add = i2o_scsi_notify_device_add, |
484 | .notify_device_remove = i2o_scsi_notify_device_remove, | |
1da177e4 LT |
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 | ||
507 | static int i2o_scsi_queuecommand(struct scsi_cmnd *SCpnt, | |
508 | void (*done) (struct scsi_cmnd *)) | |
509 | { | |
510 | struct i2o_controller *c; | |
1da177e4 | 511 | struct i2o_device *i2o_dev; |
1da177e4 LT |
512 | int tid; |
513 | struct i2o_message __iomem *msg; | |
514 | u32 m; | |
f10378ff ML |
515 | /* |
516 | * ENABLE_DISCONNECT | |
517 | * SIMPLE_TAG | |
518 | * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME | |
519 | */ | |
520 | u32 scsi_flags = 0x20a00000; | |
b2aaee33 | 521 | u32 sgl_offset; |
1da177e4 | 522 | u32 __iomem *mptr; |
b2aaee33 ML |
523 | u32 cmd = I2O_CMD_SCSI_EXEC << 24; |
524 | int rc = 0; | |
1da177e4 LT |
525 | |
526 | /* | |
527 | * Do the incoming paperwork | |
528 | */ | |
1da177e4 | 529 | i2o_dev = SCpnt->device->hostdata; |
1da177e4 | 530 | c = i2o_dev->iop; |
1da177e4 LT |
531 | |
532 | SCpnt->scsi_done = done; | |
533 | ||
534 | if (unlikely(!i2o_dev)) { | |
535 | osm_warn("no I2O device in request\n"); | |
536 | SCpnt->result = DID_NO_CONNECT << 16; | |
537 | done(SCpnt); | |
b2aaee33 | 538 | goto exit; |
1da177e4 LT |
539 | } |
540 | ||
541 | tid = i2o_dev->lct_data.tid; | |
542 | ||
543 | osm_debug("qcmd: Tid = %03x\n", tid); | |
544 | osm_debug("Real scsi messages.\n"); | |
545 | ||
1da177e4 LT |
546 | /* |
547 | * Put together a scsi execscb message | |
548 | */ | |
1da177e4 LT |
549 | switch (SCpnt->sc_data_direction) { |
550 | case PCI_DMA_NONE: | |
f10378ff | 551 | /* DATA NO XFER */ |
b2aaee33 | 552 | sgl_offset = SGL_OFFSET_0; |
1da177e4 LT |
553 | break; |
554 | ||
555 | case PCI_DMA_TODEVICE: | |
f10378ff ML |
556 | /* DATA OUT (iop-->dev) */ |
557 | scsi_flags |= 0x80000000; | |
b2aaee33 | 558 | sgl_offset = SGL_OFFSET_10; |
1da177e4 LT |
559 | break; |
560 | ||
561 | case PCI_DMA_FROMDEVICE: | |
f10378ff ML |
562 | /* DATA IN (iop<--dev) */ |
563 | scsi_flags |= 0x40000000; | |
b2aaee33 | 564 | sgl_offset = SGL_OFFSET_10; |
1da177e4 LT |
565 | break; |
566 | ||
567 | default: | |
568 | /* Unknown - kill the command */ | |
569 | SCpnt->result = DID_NO_CONNECT << 16; | |
570 | done(SCpnt); | |
b2aaee33 ML |
571 | goto exit; |
572 | } | |
573 | ||
574 | /* | |
575 | * Obtain an I2O message. If there are none free then | |
576 | * throw it back to the scsi layer | |
577 | */ | |
578 | ||
579 | m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET); | |
580 | if (m == I2O_QUEUE_EMPTY) { | |
581 | rc = SCSI_MLQUEUE_HOST_BUSY; | |
582 | goto exit; | |
583 | } | |
584 | ||
585 | mptr = &msg->body[0]; | |
586 | ||
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 | writel(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC, mptr++); | |
621 | writel(adpt_flags | tid, mptr++); | |
1da177e4 | 622 | } |
b2aaee33 | 623 | #endif |
1da177e4 | 624 | |
b2aaee33 | 625 | writel(cmd | HOST_TID << 12 | tid, &msg->u.head[1]); |
1da177e4 LT |
626 | writel(i2o_scsi_driver.context, &msg->u.s.icntxt); |
627 | ||
628 | /* We want the SCSI control block back */ | |
629 | writel(i2o_cntxt_list_add(c, SCpnt), &msg->u.s.tcntxt); | |
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 */ | |
9e87545f | 643 | /* FIXME: implement |
1da177e4 LT |
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 | ||
f10378ff | 652 | writel(scsi_flags | SCpnt->cmd_len, mptr++); |
1da177e4 LT |
653 | |
654 | /* Write SCSI command into the message - always 16 byte block */ | |
655 | memcpy_toio(mptr, SCpnt->cmnd, 16); | |
656 | mptr += 4; | |
1da177e4 | 657 | |
b2aaee33 ML |
658 | if (sgl_offset != SGL_OFFSET_0) { |
659 | /* write size of data addressed by SGL */ | |
660 | writel(SCpnt->request_bufflen, mptr++); | |
661 | ||
662 | /* Now fill in the SGList and command */ | |
663 | if (SCpnt->use_sg) { | |
664 | if (!i2o_dma_map_sg(c, SCpnt->request_buffer, | |
665 | SCpnt->use_sg, | |
666 | SCpnt->sc_data_direction, &mptr)) | |
667 | goto nomem; | |
668 | } else { | |
669 | SCpnt->SCp.dma_handle = | |
670 | i2o_dma_map_single(c, SCpnt->request_buffer, | |
671 | SCpnt->request_bufflen, | |
672 | SCpnt->sc_data_direction, &mptr); | |
673 | if (dma_mapping_error(SCpnt->SCp.dma_handle)) | |
674 | goto nomem; | |
f88e119c | 675 | } |
1da177e4 LT |
676 | } |
677 | ||
678 | /* Stick the headers on */ | |
b2aaee33 ML |
679 | writel(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset, |
680 | &msg->u.head[0]); | |
1da177e4 LT |
681 | |
682 | /* Queue the message */ | |
683 | i2o_msg_post(c, m); | |
684 | ||
685 | osm_debug("Issued %ld\n", SCpnt->serial_number); | |
686 | ||
687 | return 0; | |
b2aaee33 ML |
688 | |
689 | nomem: | |
690 | rc = -ENOMEM; | |
691 | i2o_msg_nop(c, m); | |
692 | ||
693 | exit: | |
694 | return rc; | |
1da177e4 LT |
695 | }; |
696 | ||
697 | /** | |
698 | * i2o_scsi_abort - abort a running command | |
699 | * @SCpnt: command to abort | |
700 | * | |
701 | * Ask the I2O controller to abort a command. This is an asynchrnous | |
702 | * process and our callback handler will see the command complete with an | |
703 | * aborted message if it succeeds. | |
704 | * | |
705 | * Returns 0 if the command is successfully aborted or negative error code | |
706 | * on failure. | |
707 | */ | |
708 | static int i2o_scsi_abort(struct scsi_cmnd *SCpnt) | |
709 | { | |
710 | struct i2o_device *i2o_dev; | |
711 | struct i2o_controller *c; | |
712 | struct i2o_message __iomem *msg; | |
713 | u32 m; | |
714 | int tid; | |
715 | int status = FAILED; | |
716 | ||
717 | osm_warn("Aborting command block.\n"); | |
718 | ||
719 | i2o_dev = SCpnt->device->hostdata; | |
720 | c = i2o_dev->iop; | |
721 | tid = i2o_dev->lct_data.tid; | |
722 | ||
723 | m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET); | |
724 | if (m == I2O_QUEUE_EMPTY) | |
725 | return SCSI_MLQUEUE_HOST_BUSY; | |
726 | ||
727 | writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]); | |
728 | writel(I2O_CMD_SCSI_ABORT << 24 | HOST_TID << 12 | tid, | |
729 | &msg->u.head[1]); | |
730 | writel(i2o_cntxt_list_get_ptr(c, SCpnt), &msg->body[0]); | |
731 | ||
732 | if (i2o_msg_post_wait(c, m, I2O_TIMEOUT_SCSI_SCB_ABORT)) | |
733 | status = SUCCESS; | |
734 | ||
735 | return status; | |
736 | } | |
737 | ||
738 | /** | |
739 | * i2o_scsi_bios_param - Invent disk geometry | |
740 | * @sdev: scsi device | |
741 | * @dev: block layer device | |
742 | * @capacity: size in sectors | |
743 | * @ip: geometry array | |
744 | * | |
745 | * This is anyones guess quite frankly. We use the same rules everyone | |
746 | * else appears to and hope. It seems to work. | |
747 | */ | |
748 | ||
749 | static int i2o_scsi_bios_param(struct scsi_device *sdev, | |
750 | struct block_device *dev, sector_t capacity, | |
751 | int *ip) | |
752 | { | |
753 | int size; | |
754 | ||
755 | size = capacity; | |
756 | ip[0] = 64; /* heads */ | |
757 | ip[1] = 32; /* sectors */ | |
758 | if ((ip[2] = size >> 11) > 1024) { /* cylinders, test for big disk */ | |
759 | ip[0] = 255; /* heads */ | |
760 | ip[1] = 63; /* sectors */ | |
761 | ip[2] = size / (255 * 63); /* cylinders */ | |
762 | } | |
763 | return 0; | |
764 | } | |
765 | ||
766 | static struct scsi_host_template i2o_scsi_host_template = { | |
767 | .proc_name = OSM_NAME, | |
768 | .name = OSM_DESCRIPTION, | |
769 | .info = i2o_scsi_info, | |
770 | .queuecommand = i2o_scsi_queuecommand, | |
771 | .eh_abort_handler = i2o_scsi_abort, | |
772 | .bios_param = i2o_scsi_bios_param, | |
773 | .can_queue = I2O_SCSI_CAN_QUEUE, | |
774 | .sg_tablesize = 8, | |
775 | .cmd_per_lun = 6, | |
776 | .use_clustering = ENABLE_CLUSTERING, | |
777 | }; | |
778 | ||
779 | /** | |
780 | * i2o_scsi_init - SCSI OSM initialization function | |
781 | * | |
782 | * Register SCSI OSM into I2O core. | |
783 | * | |
784 | * Returns 0 on success or negative error code on failure. | |
785 | */ | |
786 | static int __init i2o_scsi_init(void) | |
787 | { | |
788 | int rc; | |
789 | ||
790 | printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n"); | |
791 | ||
792 | /* Register SCSI OSM into I2O core */ | |
793 | rc = i2o_driver_register(&i2o_scsi_driver); | |
794 | if (rc) { | |
795 | osm_err("Could not register SCSI driver\n"); | |
796 | return rc; | |
797 | } | |
798 | ||
799 | return 0; | |
800 | }; | |
801 | ||
802 | /** | |
803 | * i2o_scsi_exit - SCSI OSM exit function | |
804 | * | |
805 | * Unregisters SCSI OSM from I2O core. | |
806 | */ | |
807 | static void __exit i2o_scsi_exit(void) | |
808 | { | |
809 | /* Unregister I2O SCSI OSM from I2O core */ | |
810 | i2o_driver_unregister(&i2o_scsi_driver); | |
811 | }; | |
812 | ||
813 | MODULE_AUTHOR("Red Hat Software"); | |
814 | MODULE_LICENSE("GPL"); | |
815 | MODULE_DESCRIPTION(OSM_DESCRIPTION); | |
816 | MODULE_VERSION(OSM_VERSION); | |
817 | ||
818 | module_init(i2o_scsi_init); | |
819 | module_exit(i2o_scsi_exit); |