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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 | 68 | #include <scsi/sg.h> |
1da177e4 LT |
69 | |
70 | #define OSM_NAME "scsi-osm" | |
2e1973a3 | 71 | #define OSM_VERSION "1.316" |
1da177e4 LT |
72 | #define OSM_DESCRIPTION "I2O SCSI Peripheral OSM" |
73 | ||
74 | static struct i2o_driver i2o_scsi_driver; | |
75 | ||
b2aaee33 ML |
76 | static unsigned int i2o_scsi_max_id = 16; |
77 | static unsigned int i2o_scsi_max_lun = 255; | |
1da177e4 LT |
78 | |
79 | struct i2o_scsi_host { | |
80 | struct Scsi_Host *scsi_host; /* pointer to the SCSI host */ | |
81 | struct i2o_controller *iop; /* pointer to the I2O controller */ | |
b2aaee33 | 82 | unsigned int lun; /* lun's used for block devices */ |
1da177e4 LT |
83 | struct i2o_device *channel[0]; /* channel->i2o_dev mapping table */ |
84 | }; | |
85 | ||
86 | static struct scsi_host_template i2o_scsi_host_template; | |
87 | ||
88 | #define I2O_SCSI_CAN_QUEUE 4 | |
89 | ||
90 | /* SCSI OSM class handling definition */ | |
91 | static struct i2o_class_id i2o_scsi_class_id[] = { | |
92 | {I2O_CLASS_SCSI_PERIPHERAL}, | |
93 | {I2O_CLASS_END} | |
94 | }; | |
95 | ||
96 | static struct i2o_scsi_host *i2o_scsi_host_alloc(struct i2o_controller *c) | |
97 | { | |
98 | struct i2o_scsi_host *i2o_shost; | |
99 | struct i2o_device *i2o_dev; | |
100 | struct Scsi_Host *scsi_host; | |
101 | int max_channel = 0; | |
102 | u8 type; | |
103 | int i; | |
104 | size_t size; | |
b2aaee33 ML |
105 | u16 body_size = 6; |
106 | ||
107 | #ifdef CONFIG_I2O_EXT_ADAPTEC | |
108 | if (c->adaptec) | |
109 | body_size = 8; | |
110 | #endif | |
1da177e4 LT |
111 | |
112 | list_for_each_entry(i2o_dev, &c->devices, list) | |
f10378ff | 113 | if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER) { |
793fd15d | 114 | if (!i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1) |
b2aaee33 | 115 | && (type == 0x01)) /* SCSI bus */ |
1da177e4 LT |
116 | max_channel++; |
117 | } | |
118 | ||
119 | if (!max_channel) { | |
120 | osm_warn("no channels found on %s\n", c->name); | |
121 | return ERR_PTR(-EFAULT); | |
122 | } | |
123 | ||
124 | size = max_channel * sizeof(struct i2o_device *) | |
125 | + sizeof(struct i2o_scsi_host); | |
126 | ||
127 | scsi_host = scsi_host_alloc(&i2o_scsi_host_template, size); | |
128 | if (!scsi_host) { | |
129 | osm_warn("Could not allocate SCSI host\n"); | |
130 | return ERR_PTR(-ENOMEM); | |
131 | } | |
132 | ||
133 | scsi_host->max_channel = max_channel - 1; | |
134 | scsi_host->max_id = i2o_scsi_max_id; | |
135 | scsi_host->max_lun = i2o_scsi_max_lun; | |
136 | scsi_host->this_id = c->unit; | |
b2aaee33 | 137 | scsi_host->sg_tablesize = i2o_sg_tablesize(c, body_size); |
1da177e4 LT |
138 | |
139 | i2o_shost = (struct i2o_scsi_host *)scsi_host->hostdata; | |
140 | i2o_shost->scsi_host = scsi_host; | |
141 | i2o_shost->iop = c; | |
b2aaee33 | 142 | i2o_shost->lun = 1; |
1da177e4 LT |
143 | |
144 | i = 0; | |
145 | list_for_each_entry(i2o_dev, &c->devices, list) | |
f10378ff | 146 | if (i2o_dev->lct_data.class_id == I2O_CLASS_BUS_ADAPTER) { |
793fd15d | 147 | if (!i2o_parm_field_get(i2o_dev, 0x0000, 0, &type, 1) |
b2aaee33 | 148 | && (type == 0x01)) /* only SCSI bus */ |
1da177e4 LT |
149 | i2o_shost->channel[i++] = i2o_dev; |
150 | ||
151 | if (i >= max_channel) | |
152 | break; | |
153 | } | |
154 | ||
155 | return i2o_shost; | |
156 | }; | |
157 | ||
158 | /** | |
159 | * i2o_scsi_get_host - Get an I2O SCSI host | |
160 | * @c: I2O controller to for which to get the SCSI host | |
161 | * | |
162 | * If the I2O controller already exists as SCSI host, the SCSI host | |
163 | * is returned, otherwise the I2O controller is added to the SCSI | |
164 | * core. | |
165 | * | |
166 | * Returns pointer to the I2O SCSI host on success or NULL on failure. | |
167 | */ | |
168 | static struct i2o_scsi_host *i2o_scsi_get_host(struct i2o_controller *c) | |
169 | { | |
170 | return c->driver_data[i2o_scsi_driver.context]; | |
171 | }; | |
172 | ||
173 | /** | |
174 | * i2o_scsi_remove - Remove I2O device from SCSI core | |
175 | * @dev: device which should be removed | |
176 | * | |
177 | * Removes the I2O device from the SCSI core again. | |
178 | * | |
179 | * Returns 0 on success. | |
180 | */ | |
181 | static int i2o_scsi_remove(struct device *dev) | |
182 | { | |
183 | struct i2o_device *i2o_dev = to_i2o_device(dev); | |
184 | struct i2o_controller *c = i2o_dev->iop; | |
185 | struct i2o_scsi_host *i2o_shost; | |
186 | struct scsi_device *scsi_dev; | |
187 | ||
f88e119c ML |
188 | osm_info("device removed (TID: %03x)\n", i2o_dev->lct_data.tid); |
189 | ||
1da177e4 LT |
190 | i2o_shost = i2o_scsi_get_host(c); |
191 | ||
192 | shost_for_each_device(scsi_dev, i2o_shost->scsi_host) | |
193 | if (scsi_dev->hostdata == i2o_dev) { | |
f10378ff | 194 | sysfs_remove_link(&i2o_dev->device.kobj, "scsi"); |
1da177e4 LT |
195 | scsi_remove_device(scsi_dev); |
196 | scsi_device_put(scsi_dev); | |
197 | break; | |
198 | } | |
199 | ||
200 | return 0; | |
201 | }; | |
202 | ||
203 | /** | |
204 | * i2o_scsi_probe - verify if dev is a I2O SCSI device and install it | |
205 | * @dev: device to verify if it is a I2O SCSI device | |
206 | * | |
25985edc | 207 | * Retrieve channel, id and lun for I2O device. If everything goes well |
1da177e4 LT |
208 | * register the I2O device as SCSI device on the I2O SCSI controller. |
209 | * | |
210 | * Returns 0 on success or negative error code on failure. | |
211 | */ | |
212 | static int i2o_scsi_probe(struct device *dev) | |
213 | { | |
214 | struct i2o_device *i2o_dev = to_i2o_device(dev); | |
215 | struct i2o_controller *c = i2o_dev->iop; | |
216 | struct i2o_scsi_host *i2o_shost; | |
217 | struct Scsi_Host *scsi_host; | |
218 | struct i2o_device *parent; | |
219 | struct scsi_device *scsi_dev; | |
b2aaee33 ML |
220 | u32 id = -1; |
221 | u64 lun = -1; | |
1da177e4 | 222 | int channel = -1; |
3889b26b | 223 | int i, rc; |
1da177e4 LT |
224 | |
225 | i2o_shost = i2o_scsi_get_host(c); | |
226 | if (!i2o_shost) | |
227 | return -EFAULT; | |
228 | ||
229 | scsi_host = i2o_shost->scsi_host; | |
230 | ||
b2aaee33 ML |
231 | switch (i2o_dev->lct_data.class_id) { |
232 | case I2O_CLASS_RANDOM_BLOCK_STORAGE: | |
233 | case I2O_CLASS_EXECUTIVE: | |
234 | #ifdef CONFIG_I2O_EXT_ADAPTEC | |
235 | if (c->adaptec) { | |
236 | u8 type; | |
237 | struct i2o_device *d = i2o_shost->channel[0]; | |
238 | ||
793fd15d | 239 | if (!i2o_parm_field_get(d, 0x0000, 0, &type, 1) |
b2aaee33 | 240 | && (type == 0x01)) /* SCSI bus */ |
793fd15d | 241 | if (!i2o_parm_field_get(d, 0x0200, 4, &id, 4)) { |
b2aaee33 ML |
242 | channel = 0; |
243 | if (i2o_dev->lct_data.class_id == | |
244 | I2O_CLASS_RANDOM_BLOCK_STORAGE) | |
793fd15d ML |
245 | lun = |
246 | cpu_to_le64(i2o_shost-> | |
247 | lun++); | |
b2aaee33 ML |
248 | else |
249 | lun = 0; | |
250 | } | |
251 | } | |
252 | #endif | |
253 | break; | |
254 | ||
255 | case I2O_CLASS_SCSI_PERIPHERAL: | |
793fd15d | 256 | if (i2o_parm_field_get(i2o_dev, 0x0000, 3, &id, 4)) |
b2aaee33 ML |
257 | return -EFAULT; |
258 | ||
793fd15d | 259 | if (i2o_parm_field_get(i2o_dev, 0x0000, 4, &lun, 8)) |
b2aaee33 ML |
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 | 283 | |
793fd15d ML |
284 | if (le32_to_cpu(id) >= scsi_host->max_id) { |
285 | osm_warn("SCSI device id (%d) >= max_id of I2O host (%d)", | |
286 | le32_to_cpu(id), scsi_host->max_id); | |
1da177e4 LT |
287 | return -EFAULT; |
288 | } | |
289 | ||
793fd15d ML |
290 | if (le64_to_cpu(lun) >= scsi_host->max_lun) { |
291 | osm_warn("SCSI device lun (%lu) >= max_lun of I2O host (%d)", | |
292 | (long unsigned int)le64_to_cpu(lun), | |
293 | scsi_host->max_lun); | |
1da177e4 LT |
294 | return -EFAULT; |
295 | } | |
296 | ||
1da177e4 | 297 | scsi_dev = |
793fd15d ML |
298 | __scsi_add_device(i2o_shost->scsi_host, channel, le32_to_cpu(id), |
299 | le64_to_cpu(lun), i2o_dev); | |
1da177e4 | 300 | |
f10378ff | 301 | if (IS_ERR(scsi_dev)) { |
1da177e4 LT |
302 | osm_warn("can not add SCSI device %03x\n", |
303 | i2o_dev->lct_data.tid); | |
f10378ff | 304 | return PTR_ERR(scsi_dev); |
1da177e4 LT |
305 | } |
306 | ||
3889b26b JG |
307 | rc = sysfs_create_link(&i2o_dev->device.kobj, |
308 | &scsi_dev->sdev_gendev.kobj, "scsi"); | |
309 | if (rc) | |
310 | goto err; | |
f10378ff | 311 | |
dcceafe2 | 312 | osm_info("device added (TID: %03x) channel: %d, id: %d, lun: %ld\n", |
793fd15d | 313 | i2o_dev->lct_data.tid, channel, le32_to_cpu(id), |
dcceafe2 | 314 | (long unsigned int)le64_to_cpu(lun)); |
1da177e4 LT |
315 | |
316 | return 0; | |
3889b26b JG |
317 | |
318 | err: | |
319 | scsi_remove_device(scsi_dev); | |
320 | return rc; | |
1da177e4 LT |
321 | }; |
322 | ||
323 | static const char *i2o_scsi_info(struct Scsi_Host *SChost) | |
324 | { | |
325 | struct i2o_scsi_host *hostdata; | |
326 | hostdata = (struct i2o_scsi_host *)SChost->hostdata; | |
327 | return hostdata->iop->name; | |
328 | } | |
329 | ||
330 | /** | |
331 | * i2o_scsi_reply - SCSI OSM message reply handler | |
332 | * @c: controller issuing the reply | |
333 | * @m: message id for flushing | |
334 | * @msg: the message from the controller | |
335 | * | |
336 | * Process reply messages (interrupts in normal scsi controller think). | |
337 | * We can get a variety of messages to process. The normal path is | |
338 | * scsi command completions. We must also deal with IOP failures, | |
339 | * the reply to a bus reset and the reply to a LUN query. | |
340 | * | |
341 | * Returns 0 on success and if the reply should not be flushed or > 0 | |
342 | * on success and if the reply should be flushed. Returns negative error | |
343 | * code on failure and if the reply should be flushed. | |
344 | */ | |
345 | static int i2o_scsi_reply(struct i2o_controller *c, u32 m, | |
346 | struct i2o_message *msg) | |
347 | { | |
348 | struct scsi_cmnd *cmd; | |
9e87545f | 349 | u32 error; |
1da177e4 | 350 | struct device *dev; |
1da177e4 LT |
351 | |
352 | cmd = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt)); | |
9e87545f ML |
353 | if (unlikely(!cmd)) { |
354 | osm_err("NULL reply received!\n"); | |
355 | return -1; | |
1da177e4 LT |
356 | } |
357 | ||
358 | /* | |
359 | * Low byte is device status, next is adapter status, | |
360 | * (then one byte reserved), then request status. | |
361 | */ | |
9e87545f | 362 | error = le32_to_cpu(msg->body[0]); |
1da177e4 | 363 | |
9e87545f ML |
364 | osm_debug("Completed %ld\n", cmd->serial_number); |
365 | ||
366 | cmd->result = error & 0xff; | |
1da177e4 | 367 | /* |
9e87545f ML |
368 | * if DeviceStatus is not SCSI_SUCCESS copy over the sense data and let |
369 | * the SCSI layer handle the error | |
1da177e4 | 370 | */ |
9e87545f ML |
371 | if (cmd->result) |
372 | memcpy(cmd->sense_buffer, &msg->body[3], | |
b80ca4f7 | 373 | min(SCSI_SENSE_BUFFERSIZE, 40)); |
1da177e4 | 374 | |
9e87545f ML |
375 | /* only output error code if AdapterStatus is not HBA_SUCCESS */ |
376 | if ((error >> 8) & 0xff) | |
377 | osm_err("SCSI error %08x\n", error); | |
1da177e4 | 378 | |
9e87545f | 379 | dev = &c->pdev->dev; |
0ea7154f FT |
380 | |
381 | scsi_dma_unmap(cmd); | |
1da177e4 | 382 | |
9e87545f | 383 | cmd->scsi_done(cmd); |
1da177e4 | 384 | |
9e87545f ML |
385 | return 1; |
386 | }; | |
1da177e4 | 387 | |
9e87545f ML |
388 | /** |
389 | * i2o_scsi_notify_device_add - Retrieve notifications of added devices | |
390 | * @i2o_dev: the I2O device which was added | |
391 | * | |
392 | * If a I2O device is added we catch the notification, because I2O classes | |
025dfdaf | 393 | * other than SCSI peripheral will not be received through |
9e87545f ML |
394 | * i2o_scsi_probe(). |
395 | */ | |
396 | static void i2o_scsi_notify_device_add(struct i2o_device *i2o_dev) | |
397 | { | |
398 | switch (i2o_dev->lct_data.class_id) { | |
399 | case I2O_CLASS_EXECUTIVE: | |
400 | case I2O_CLASS_RANDOM_BLOCK_STORAGE: | |
401 | i2o_scsi_probe(&i2o_dev->device); | |
402 | break; | |
1da177e4 | 403 | |
9e87545f ML |
404 | default: |
405 | break; | |
1da177e4 | 406 | } |
9e87545f | 407 | }; |
1da177e4 | 408 | |
9e87545f | 409 | /** |
d9489fb6 | 410 | * i2o_scsi_notify_device_remove - Retrieve notifications of removed devices |
9e87545f ML |
411 | * @i2o_dev: the I2O device which was removed |
412 | * | |
413 | * If a I2O device is removed, we catch the notification to remove the | |
414 | * corresponding SCSI device. | |
415 | */ | |
416 | static void i2o_scsi_notify_device_remove(struct i2o_device *i2o_dev) | |
417 | { | |
418 | switch (i2o_dev->lct_data.class_id) { | |
419 | case I2O_CLASS_EXECUTIVE: | |
420 | case I2O_CLASS_RANDOM_BLOCK_STORAGE: | |
421 | i2o_scsi_remove(&i2o_dev->device); | |
422 | break; | |
f88e119c | 423 | |
9e87545f ML |
424 | default: |
425 | break; | |
426 | } | |
1da177e4 LT |
427 | }; |
428 | ||
429 | /** | |
d9489fb6 | 430 | * i2o_scsi_notify_controller_add - Retrieve notifications of added controllers |
1da177e4 LT |
431 | * @c: the controller which was added |
432 | * | |
433 | * If a I2O controller is added, we catch the notification to add a | |
434 | * corresponding Scsi_Host. | |
435 | */ | |
436 | static void i2o_scsi_notify_controller_add(struct i2o_controller *c) | |
437 | { | |
438 | struct i2o_scsi_host *i2o_shost; | |
439 | int rc; | |
440 | ||
441 | i2o_shost = i2o_scsi_host_alloc(c); | |
442 | if (IS_ERR(i2o_shost)) { | |
443 | osm_err("Could not initialize SCSI host\n"); | |
444 | return; | |
445 | } | |
446 | ||
447 | rc = scsi_add_host(i2o_shost->scsi_host, &c->device); | |
448 | if (rc) { | |
449 | osm_err("Could not add SCSI host\n"); | |
450 | scsi_host_put(i2o_shost->scsi_host); | |
451 | return; | |
452 | } | |
453 | ||
454 | c->driver_data[i2o_scsi_driver.context] = i2o_shost; | |
455 | ||
456 | osm_debug("new I2O SCSI host added\n"); | |
457 | }; | |
458 | ||
459 | /** | |
d9489fb6 | 460 | * i2o_scsi_notify_controller_remove - Retrieve notifications of removed controllers |
1da177e4 LT |
461 | * @c: the controller which was removed |
462 | * | |
463 | * If a I2O controller is removed, we catch the notification to remove the | |
464 | * corresponding Scsi_Host. | |
465 | */ | |
466 | static void i2o_scsi_notify_controller_remove(struct i2o_controller *c) | |
467 | { | |
468 | struct i2o_scsi_host *i2o_shost; | |
469 | i2o_shost = i2o_scsi_get_host(c); | |
470 | if (!i2o_shost) | |
471 | return; | |
472 | ||
473 | c->driver_data[i2o_scsi_driver.context] = NULL; | |
474 | ||
475 | scsi_remove_host(i2o_shost->scsi_host); | |
476 | scsi_host_put(i2o_shost->scsi_host); | |
f88e119c | 477 | osm_debug("I2O SCSI host removed\n"); |
1da177e4 LT |
478 | }; |
479 | ||
480 | /* SCSI OSM driver struct */ | |
481 | static struct i2o_driver i2o_scsi_driver = { | |
482 | .name = OSM_NAME, | |
483 | .reply = i2o_scsi_reply, | |
484 | .classes = i2o_scsi_class_id, | |
9e87545f ML |
485 | .notify_device_add = i2o_scsi_notify_device_add, |
486 | .notify_device_remove = i2o_scsi_notify_device_remove, | |
1da177e4 LT |
487 | .notify_controller_add = i2o_scsi_notify_controller_add, |
488 | .notify_controller_remove = i2o_scsi_notify_controller_remove, | |
489 | .driver = { | |
490 | .probe = i2o_scsi_probe, | |
491 | .remove = i2o_scsi_remove, | |
492 | }, | |
493 | }; | |
494 | ||
495 | /** | |
496 | * i2o_scsi_queuecommand - queue a SCSI command | |
497 | * @SCpnt: scsi command pointer | |
498 | * @done: callback for completion | |
499 | * | |
500 | * Issue a scsi command asynchronously. Return 0 on success or 1 if | |
501 | * we hit an error (normally message queue congestion). The only | |
502 | * minor complication here is that I2O deals with the device addressing | |
503 | * so we have to map the bus/dev/lun back to an I2O handle as well | |
504 | * as faking absent devices ourself. | |
505 | * | |
506 | * Locks: takes the controller lock on error path only | |
507 | */ | |
508 | ||
f281233d | 509 | static int i2o_scsi_queuecommand_lck(struct scsi_cmnd *SCpnt, |
1da177e4 LT |
510 | void (*done) (struct scsi_cmnd *)) |
511 | { | |
512 | struct i2o_controller *c; | |
1da177e4 | 513 | struct i2o_device *i2o_dev; |
1da177e4 | 514 | int tid; |
a1a5ea70 | 515 | struct i2o_message *msg; |
f10378ff ML |
516 | /* |
517 | * ENABLE_DISCONNECT | |
518 | * SIMPLE_TAG | |
519 | * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME | |
520 | */ | |
521 | u32 scsi_flags = 0x20a00000; | |
b2aaee33 | 522 | u32 sgl_offset; |
a1a5ea70 | 523 | u32 *mptr; |
b2aaee33 ML |
524 | u32 cmd = I2O_CMD_SCSI_EXEC << 24; |
525 | int rc = 0; | |
1da177e4 LT |
526 | |
527 | /* | |
528 | * Do the incoming paperwork | |
529 | */ | |
1da177e4 | 530 | i2o_dev = SCpnt->device->hostdata; |
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 | 539 | } |
d2367006 | 540 | c = i2o_dev->iop; |
1da177e4 LT |
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 | ||
a1a5ea70 ML |
579 | msg = i2o_msg_get(c); |
580 | if (IS_ERR(msg)) { | |
b2aaee33 ML |
581 | rc = SCSI_MLQUEUE_HOST_BUSY; |
582 | goto exit; | |
583 | } | |
584 | ||
585 | mptr = &msg->body[0]; | |
586 | ||
beb40487 | 587 | #if 0 /* this code can't work */ |
b2aaee33 ML |
588 | #ifdef CONFIG_I2O_EXT_ADAPTEC |
589 | if (c->adaptec) { | |
590 | u32 adpt_flags = 0; | |
591 | ||
592 | if (SCpnt->sc_request && SCpnt->sc_request->upper_private_data) { | |
593 | i2o_sg_io_hdr_t __user *usr_ptr = | |
594 | ((Sg_request *) (SCpnt->sc_request-> | |
595 | upper_private_data))->header. | |
596 | usr_ptr; | |
597 | ||
598 | if (usr_ptr) | |
599 | get_user(adpt_flags, &usr_ptr->flags); | |
600 | } | |
601 | ||
602 | switch (i2o_dev->lct_data.class_id) { | |
603 | case I2O_CLASS_EXECUTIVE: | |
604 | case I2O_CLASS_RANDOM_BLOCK_STORAGE: | |
605 | /* interpret flag has to be set for executive */ | |
606 | adpt_flags ^= I2O_DPT_SG_FLAG_INTERPRET; | |
607 | break; | |
608 | ||
609 | default: | |
610 | break; | |
611 | } | |
612 | ||
613 | /* | |
614 | * for Adaptec controllers we use the PRIVATE command, because | |
615 | * the normal SCSI EXEC doesn't support all SCSI commands on | |
616 | * all controllers (for example READ CAPACITY). | |
617 | */ | |
618 | if (sgl_offset == SGL_OFFSET_10) | |
619 | sgl_offset = SGL_OFFSET_12; | |
620 | cmd = I2O_CMD_PRIVATE << 24; | |
a1a5ea70 ML |
621 | *mptr++ = cpu_to_le32(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC); |
622 | *mptr++ = cpu_to_le32(adpt_flags | tid); | |
1da177e4 | 623 | } |
beb40487 | 624 | #endif |
b2aaee33 | 625 | #endif |
1da177e4 | 626 | |
a1a5ea70 ML |
627 | msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid); |
628 | msg->u.s.icntxt = cpu_to_le32(i2o_scsi_driver.context); | |
1da177e4 LT |
629 | |
630 | /* We want the SCSI control block back */ | |
a1a5ea70 | 631 | msg->u.s.tcntxt = cpu_to_le32(i2o_cntxt_list_add(c, SCpnt)); |
1da177e4 LT |
632 | |
633 | /* LSI_920_PCI_QUIRK | |
634 | * | |
635 | * Intermittant observations of msg frame word data corruption | |
636 | * observed on msg[4] after: | |
637 | * WRITE, READ-MODIFY-WRITE | |
638 | * operations. 19990606 -sralston | |
639 | * | |
640 | * (Hence we build this word via tag. Its good practice anyway | |
641 | * we don't want fetches over PCI needlessly) | |
642 | */ | |
643 | ||
644 | /* Attach tags to the devices */ | |
9e87545f | 645 | /* FIXME: implement |
1da177e4 LT |
646 | if(SCpnt->device->tagged_supported) { |
647 | if(SCpnt->tag == HEAD_OF_QUEUE_TAG) | |
648 | scsi_flags |= 0x01000000; | |
649 | else if(SCpnt->tag == ORDERED_QUEUE_TAG) | |
650 | scsi_flags |= 0x01800000; | |
651 | } | |
652 | */ | |
653 | ||
a1a5ea70 | 654 | *mptr++ = cpu_to_le32(scsi_flags | SCpnt->cmd_len); |
1da177e4 LT |
655 | |
656 | /* Write SCSI command into the message - always 16 byte block */ | |
a1a5ea70 | 657 | memcpy(mptr, SCpnt->cmnd, 16); |
1da177e4 | 658 | mptr += 4; |
1da177e4 | 659 | |
b2aaee33 ML |
660 | if (sgl_offset != SGL_OFFSET_0) { |
661 | /* write size of data addressed by SGL */ | |
0ea7154f | 662 | *mptr++ = cpu_to_le32(scsi_bufflen(SCpnt)); |
b2aaee33 ML |
663 | |
664 | /* Now fill in the SGList and command */ | |
0ea7154f FT |
665 | |
666 | if (scsi_sg_count(SCpnt)) { | |
667 | if (!i2o_dma_map_sg(c, scsi_sglist(SCpnt), | |
668 | scsi_sg_count(SCpnt), | |
b2aaee33 ML |
669 | SCpnt->sc_data_direction, &mptr)) |
670 | goto nomem; | |
f88e119c | 671 | } |
1da177e4 LT |
672 | } |
673 | ||
674 | /* Stick the headers on */ | |
a1a5ea70 ML |
675 | msg->u.head[0] = |
676 | cpu_to_le32(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset); | |
1da177e4 LT |
677 | |
678 | /* Queue the message */ | |
a1a5ea70 | 679 | i2o_msg_post(c, msg); |
1da177e4 LT |
680 | |
681 | osm_debug("Issued %ld\n", SCpnt->serial_number); | |
682 | ||
683 | return 0; | |
b2aaee33 ML |
684 | |
685 | nomem: | |
686 | rc = -ENOMEM; | |
a1a5ea70 | 687 | i2o_msg_nop(c, msg); |
b2aaee33 ML |
688 | |
689 | exit: | |
690 | return rc; | |
f281233d JG |
691 | } |
692 | ||
693 | static DEF_SCSI_QCMD(i2o_scsi_queuecommand) | |
1da177e4 LT |
694 | |
695 | /** | |
696 | * i2o_scsi_abort - abort a running command | |
697 | * @SCpnt: command to abort | |
698 | * | |
699 | * Ask the I2O controller to abort a command. This is an asynchrnous | |
700 | * process and our callback handler will see the command complete with an | |
701 | * aborted message if it succeeds. | |
702 | * | |
703 | * Returns 0 if the command is successfully aborted or negative error code | |
704 | * on failure. | |
705 | */ | |
706 | static int i2o_scsi_abort(struct scsi_cmnd *SCpnt) | |
707 | { | |
708 | struct i2o_device *i2o_dev; | |
709 | struct i2o_controller *c; | |
a1a5ea70 | 710 | struct i2o_message *msg; |
1da177e4 LT |
711 | int tid; |
712 | int status = FAILED; | |
713 | ||
714 | osm_warn("Aborting command block.\n"); | |
715 | ||
716 | i2o_dev = SCpnt->device->hostdata; | |
717 | c = i2o_dev->iop; | |
718 | tid = i2o_dev->lct_data.tid; | |
719 | ||
a1a5ea70 ML |
720 | msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET); |
721 | if (IS_ERR(msg)) | |
1da177e4 LT |
722 | return SCSI_MLQUEUE_HOST_BUSY; |
723 | ||
a1a5ea70 ML |
724 | msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); |
725 | msg->u.head[1] = | |
726 | cpu_to_le32(I2O_CMD_SCSI_ABORT << 24 | HOST_TID << 12 | tid); | |
727 | msg->body[0] = cpu_to_le32(i2o_cntxt_list_get_ptr(c, SCpnt)); | |
1da177e4 | 728 | |
e22bec26 | 729 | if (!i2o_msg_post_wait(c, msg, I2O_TIMEOUT_SCSI_SCB_ABORT)) |
1da177e4 LT |
730 | status = SUCCESS; |
731 | ||
732 | return status; | |
733 | } | |
734 | ||
735 | /** | |
736 | * i2o_scsi_bios_param - Invent disk geometry | |
737 | * @sdev: scsi device | |
738 | * @dev: block layer device | |
739 | * @capacity: size in sectors | |
740 | * @ip: geometry array | |
741 | * | |
d9489fb6 | 742 | * This is anyone's guess quite frankly. We use the same rules everyone |
1da177e4 LT |
743 | * else appears to and hope. It seems to work. |
744 | */ | |
745 | ||
746 | static int i2o_scsi_bios_param(struct scsi_device *sdev, | |
747 | struct block_device *dev, sector_t capacity, | |
748 | int *ip) | |
749 | { | |
750 | int size; | |
751 | ||
752 | size = capacity; | |
753 | ip[0] = 64; /* heads */ | |
754 | ip[1] = 32; /* sectors */ | |
755 | if ((ip[2] = size >> 11) > 1024) { /* cylinders, test for big disk */ | |
756 | ip[0] = 255; /* heads */ | |
757 | ip[1] = 63; /* sectors */ | |
758 | ip[2] = size / (255 * 63); /* cylinders */ | |
759 | } | |
760 | return 0; | |
761 | } | |
762 | ||
763 | static struct scsi_host_template i2o_scsi_host_template = { | |
764 | .proc_name = OSM_NAME, | |
765 | .name = OSM_DESCRIPTION, | |
766 | .info = i2o_scsi_info, | |
767 | .queuecommand = i2o_scsi_queuecommand, | |
768 | .eh_abort_handler = i2o_scsi_abort, | |
769 | .bios_param = i2o_scsi_bios_param, | |
770 | .can_queue = I2O_SCSI_CAN_QUEUE, | |
771 | .sg_tablesize = 8, | |
772 | .cmd_per_lun = 6, | |
773 | .use_clustering = ENABLE_CLUSTERING, | |
774 | }; | |
775 | ||
776 | /** | |
777 | * i2o_scsi_init - SCSI OSM initialization function | |
778 | * | |
779 | * Register SCSI OSM into I2O core. | |
780 | * | |
781 | * Returns 0 on success or negative error code on failure. | |
782 | */ | |
783 | static int __init i2o_scsi_init(void) | |
784 | { | |
785 | int rc; | |
786 | ||
787 | printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n"); | |
788 | ||
789 | /* Register SCSI OSM into I2O core */ | |
790 | rc = i2o_driver_register(&i2o_scsi_driver); | |
791 | if (rc) { | |
792 | osm_err("Could not register SCSI driver\n"); | |
793 | return rc; | |
794 | } | |
795 | ||
796 | return 0; | |
797 | }; | |
798 | ||
799 | /** | |
800 | * i2o_scsi_exit - SCSI OSM exit function | |
801 | * | |
802 | * Unregisters SCSI OSM from I2O core. | |
803 | */ | |
804 | static void __exit i2o_scsi_exit(void) | |
805 | { | |
806 | /* Unregister I2O SCSI OSM from I2O core */ | |
807 | i2o_driver_unregister(&i2o_scsi_driver); | |
808 | }; | |
809 | ||
810 | MODULE_AUTHOR("Red Hat Software"); | |
811 | MODULE_LICENSE("GPL"); | |
812 | MODULE_DESCRIPTION(OSM_DESCRIPTION); | |
813 | MODULE_VERSION(OSM_VERSION); | |
814 | ||
815 | module_init(i2o_scsi_init); | |
816 | module_exit(i2o_scsi_exit); |