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1 | /* |
2 | * SBP2 driver (SCSI over IEEE1394) |
3 | * |
4 | * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net> |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by |
8 | * the Free Software Foundation; either version 2 of the License, or |
9 | * (at your option) any later version. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software Foundation, |
18 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
19 | */ |
20 | |
21 | /* |
22 | * The basic structure of this driver is based on the old storage driver, |
23 | * drivers/ieee1394/sbp2.c, originally written by |
24 | * James Goodwin <jamesg@filanet.com> |
25 | * with later contributions and ongoing maintenance from |
26 | * Ben Collins <bcollins@debian.org>, |
27 | * Stefan Richter <stefanr@s5r6.in-berlin.de> |
28 | * and many others. |
29 | */ |
30 | |
31 | #include <linux/blkdev.h> |
32 | #include <linux/bug.h> |
33 | #include <linux/completion.h> |
34 | #include <linux/delay.h> |
35 | #include <linux/device.h> |
36 | #include <linux/dma-mapping.h> |
37 | #include <linux/firewire.h> |
38 | #include <linux/firewire-constants.h> |
39 | #include <linux/init.h> |
40 | #include <linux/jiffies.h> |
41 | #include <linux/kernel.h> |
42 | #include <linux/kref.h> |
43 | #include <linux/list.h> |
44 | #include <linux/mod_devicetable.h> |
45 | #include <linux/module.h> |
46 | #include <linux/moduleparam.h> |
47 | #include <linux/scatterlist.h> |
48 | #include <linux/slab.h> |
49 | #include <linux/spinlock.h> |
50 | #include <linux/string.h> |
51 | #include <linux/stringify.h> |
52 | #include <linux/workqueue.h> |
53 | |
54 | #include <asm/byteorder.h> |
55 | #include <asm/system.h> |
56 | |
57 | #include <scsi/scsi.h> |
58 | #include <scsi/scsi_cmnd.h> |
59 | #include <scsi/scsi_device.h> |
60 | #include <scsi/scsi_host.h> |
61 | |
62 | /* |
63 | * So far only bridges from Oxford Semiconductor are known to support |
64 | * concurrent logins. Depending on firmware, four or two concurrent logins |
65 | * are possible on OXFW911 and newer Oxsemi bridges. |
66 | * |
67 | * Concurrent logins are useful together with cluster filesystems. |
68 | */ |
69 | static int sbp2_param_exclusive_login = 1; |
70 | module_param_named(exclusive_login, sbp2_param_exclusive_login, bool, 0644); |
71 | MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device " |
72 | "(default = Y, use N for concurrent initiators)"); |
73 | |
74 | /* |
75 | * Flags for firmware oddities |
76 | * |
77 | * - 128kB max transfer |
78 | * Limit transfer size. Necessary for some old bridges. |
79 | * |
80 | * - 36 byte inquiry |
81 | * When scsi_mod probes the device, let the inquiry command look like that |
82 | * from MS Windows. |
83 | * |
84 | * - skip mode page 8 |
85 | * Suppress sending of mode_sense for mode page 8 if the device pretends to |
86 | * support the SCSI Primary Block commands instead of Reduced Block Commands. |
87 | * |
88 | * - fix capacity |
89 | * Tell sd_mod to correct the last sector number reported by read_capacity. |
90 | * Avoids access beyond actual disk limits on devices with an off-by-one bug. |
91 | * Don't use this with devices which don't have this bug. |
92 | * |
93 | * - delay inquiry |
94 | * Wait extra SBP2_INQUIRY_DELAY seconds after login before SCSI inquiry. |
95 | * |
96 | * - power condition |
97 | * Set the power condition field in the START STOP UNIT commands sent by |
98 | * sd_mod on suspend, resume, and shutdown (if manage_start_stop is on). |
99 | * Some disks need this to spin down or to resume properly. |
100 | * |
101 | * - override internal blacklist |
102 | * Instead of adding to the built-in blacklist, use only the workarounds |
103 | * specified in the module load parameter. |
104 | * Useful if a blacklist entry interfered with a non-broken device. |
105 | */ |
106 | #define SBP2_WORKAROUND_128K_MAX_TRANS 0x1 |
107 | #define SBP2_WORKAROUND_INQUIRY_36 0x2 |
108 | #define SBP2_WORKAROUND_MODE_SENSE_8 0x4 |
109 | #define SBP2_WORKAROUND_FIX_CAPACITY 0x8 |
110 | #define SBP2_WORKAROUND_DELAY_INQUIRY 0x10 |
111 | #define SBP2_INQUIRY_DELAY 12 |
112 | #define SBP2_WORKAROUND_POWER_CONDITION 0x20 |
113 | #define SBP2_WORKAROUND_OVERRIDE 0x100 |
114 | |
115 | static int sbp2_param_workarounds; |
116 | module_param_named(workarounds, sbp2_param_workarounds, int, 0644); |
117 | MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0" |
118 | ", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS) |
119 | ", 36 byte inquiry = " __stringify(SBP2_WORKAROUND_INQUIRY_36) |
120 | ", skip mode page 8 = " __stringify(SBP2_WORKAROUND_MODE_SENSE_8) |
121 | ", fix capacity = " __stringify(SBP2_WORKAROUND_FIX_CAPACITY) |
122 | ", delay inquiry = " __stringify(SBP2_WORKAROUND_DELAY_INQUIRY) |
123 | ", set power condition in start stop unit = " |
124 | __stringify(SBP2_WORKAROUND_POWER_CONDITION) |
125 | ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE) |
126 | ", or a combination)"); |
127 | |
128 | /* I don't know why the SCSI stack doesn't define something like this... */ |
129 | typedef void (*scsi_done_fn_t)(struct scsi_cmnd *); |
130 | |
131 | static const char sbp2_driver_name[] = "sbp2"; |
132 | |
133 | /* |
134 | * We create one struct sbp2_logical_unit per SBP-2 Logical Unit Number Entry |
135 | * and one struct scsi_device per sbp2_logical_unit. |
136 | */ |
137 | struct sbp2_logical_unit { |
138 | struct sbp2_target *tgt; |
139 | struct list_head link; |
140 | struct fw_address_handler address_handler; |
141 | struct list_head orb_list; |
142 | |
143 | u64 command_block_agent_address; |
144 | u16 lun; |
145 | int login_id; |
146 | |
147 | /* |
148 | * The generation is updated once we've logged in or reconnected |
149 | * to the logical unit. Thus, I/O to the device will automatically |
150 | * fail and get retried if it happens in a window where the device |
151 | * is not ready, e.g. after a bus reset but before we reconnect. |
152 | */ |
153 | int generation; |
154 | int retries; |
155 | struct delayed_work work; |
156 | bool has_sdev; |
157 | bool blocked; |
158 | }; |
159 | |
160 | /* |
161 | * We create one struct sbp2_target per IEEE 1212 Unit Directory |
162 | * and one struct Scsi_Host per sbp2_target. |
163 | */ |
164 | struct sbp2_target { |
165 | struct kref kref; |
166 | struct fw_unit *unit; |
167 | const char *bus_id; |
168 | struct list_head lu_list; |
169 | |
170 | u64 management_agent_address; |
171 | u64 guid; |
172 | int directory_id; |
173 | int node_id; |
174 | int address_high; |
175 | unsigned int workarounds; |
176 | unsigned int mgt_orb_timeout; |
177 | unsigned int max_payload; |
178 | |
179 | int dont_block; /* counter for each logical unit */ |
180 | int blocked; /* ditto */ |
181 | }; |
182 | |
183 | static struct fw_device *target_device(struct sbp2_target *tgt) |
184 | { |
185 | return fw_parent_device(tgt->unit); |
186 | } |
187 | |
188 | /* Impossible login_id, to detect logout attempt before successful login */ |
189 | #define INVALID_LOGIN_ID 0x10000 |
190 | |
191 | #define SBP2_ORB_TIMEOUT 2000U /* Timeout in ms */ |
192 | #define SBP2_ORB_NULL 0x80000000 |
193 | #define SBP2_RETRY_LIMIT 0xf /* 15 retries */ |
194 | #define SBP2_CYCLE_LIMIT (0xc8 << 12) /* 200 125us cycles */ |
195 | |
196 | /* |
197 | * There is no transport protocol limit to the CDB length, but we implement |
198 | * a fixed length only. 16 bytes is enough for disks larger than 2 TB. |
199 | */ |
200 | #define SBP2_MAX_CDB_SIZE 16 |
201 | |
202 | /* |
203 | * The default maximum s/g segment size of a FireWire controller is |
204 | * usually 0x10000, but SBP-2 only allows 0xffff. Since buffers have to |
205 | * be quadlet-aligned, we set the length limit to 0xffff & ~3. |
206 | */ |
207 | #define SBP2_MAX_SEG_SIZE 0xfffc |
208 | |
209 | /* Unit directory keys */ |
210 | #define SBP2_CSR_UNIT_CHARACTERISTICS 0x3a |
211 | #define SBP2_CSR_FIRMWARE_REVISION 0x3c |
212 | #define SBP2_CSR_LOGICAL_UNIT_NUMBER 0x14 |
213 | #define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4 |
214 | |
215 | /* Management orb opcodes */ |
216 | #define SBP2_LOGIN_REQUEST 0x0 |
217 | #define SBP2_QUERY_LOGINS_REQUEST 0x1 |
218 | #define SBP2_RECONNECT_REQUEST 0x3 |
219 | #define SBP2_SET_PASSWORD_REQUEST 0x4 |
220 | #define SBP2_LOGOUT_REQUEST 0x7 |
221 | #define SBP2_ABORT_TASK_REQUEST 0xb |
222 | #define SBP2_ABORT_TASK_SET 0xc |
223 | #define SBP2_LOGICAL_UNIT_RESET 0xe |
224 | #define SBP2_TARGET_RESET_REQUEST 0xf |
225 | |
226 | /* Offsets for command block agent registers */ |
227 | #define SBP2_AGENT_STATE 0x00 |
228 | #define SBP2_AGENT_RESET 0x04 |
229 | #define SBP2_ORB_POINTER 0x08 |
230 | #define SBP2_DOORBELL 0x10 |
231 | #define SBP2_UNSOLICITED_STATUS_ENABLE 0x14 |
232 | |
233 | /* Status write response codes */ |
234 | #define SBP2_STATUS_REQUEST_COMPLETE 0x0 |
235 | #define SBP2_STATUS_TRANSPORT_FAILURE 0x1 |
236 | #define SBP2_STATUS_ILLEGAL_REQUEST 0x2 |
237 | #define SBP2_STATUS_VENDOR_DEPENDENT 0x3 |
238 | |
239 | #define STATUS_GET_ORB_HIGH(v) ((v).status & 0xffff) |
240 | #define STATUS_GET_SBP_STATUS(v) (((v).status >> 16) & 0xff) |
241 | #define STATUS_GET_LEN(v) (((v).status >> 24) & 0x07) |
242 | #define STATUS_GET_DEAD(v) (((v).status >> 27) & 0x01) |
243 | #define STATUS_GET_RESPONSE(v) (((v).status >> 28) & 0x03) |
244 | #define STATUS_GET_SOURCE(v) (((v).status >> 30) & 0x03) |
245 | #define STATUS_GET_ORB_LOW(v) ((v).orb_low) |
246 | #define STATUS_GET_DATA(v) ((v).data) |
247 | |
248 | struct sbp2_status { |
249 | u32 status; |
250 | u32 orb_low; |
251 | u8 data[24]; |
252 | }; |
253 | |
254 | struct sbp2_pointer { |
255 | __be32 high; |
256 | __be32 low; |
257 | }; |
258 | |
259 | struct sbp2_orb { |
260 | struct fw_transaction t; |
261 | struct kref kref; |
262 | dma_addr_t request_bus; |
263 | int rcode; |
264 | struct sbp2_pointer pointer; |
265 | void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status); |
266 | struct list_head link; |
267 | }; |
268 | |
269 | #define MANAGEMENT_ORB_LUN(v) ((v)) |
270 | #define MANAGEMENT_ORB_FUNCTION(v) ((v) << 16) |
271 | #define MANAGEMENT_ORB_RECONNECT(v) ((v) << 20) |
272 | #define MANAGEMENT_ORB_EXCLUSIVE(v) ((v) ? 1 << 28 : 0) |
273 | #define MANAGEMENT_ORB_REQUEST_FORMAT(v) ((v) << 29) |
274 | #define MANAGEMENT_ORB_NOTIFY ((1) << 31) |
275 | |
276 | #define MANAGEMENT_ORB_RESPONSE_LENGTH(v) ((v)) |
277 | #define MANAGEMENT_ORB_PASSWORD_LENGTH(v) ((v) << 16) |
278 | |
279 | struct sbp2_management_orb { |
280 | struct sbp2_orb base; |
281 | struct { |
282 | struct sbp2_pointer password; |
283 | struct sbp2_pointer response; |
284 | __be32 misc; |
285 | __be32 length; |
286 | struct sbp2_pointer status_fifo; |
287 | } request; |
288 | __be32 response[4]; |
289 | dma_addr_t response_bus; |
290 | struct completion done; |
291 | struct sbp2_status status; |
292 | }; |
293 | |
294 | struct sbp2_login_response { |
295 | __be32 misc; |
296 | struct sbp2_pointer command_block_agent; |
297 | __be32 reconnect_hold; |
298 | }; |
299 | #define COMMAND_ORB_DATA_SIZE(v) ((v)) |
300 | #define COMMAND_ORB_PAGE_SIZE(v) ((v) << 16) |
301 | #define COMMAND_ORB_PAGE_TABLE_PRESENT ((1) << 19) |
302 | #define COMMAND_ORB_MAX_PAYLOAD(v) ((v) << 20) |
303 | #define COMMAND_ORB_SPEED(v) ((v) << 24) |
304 | #define COMMAND_ORB_DIRECTION ((1) << 27) |
305 | #define COMMAND_ORB_REQUEST_FORMAT(v) ((v) << 29) |
306 | #define COMMAND_ORB_NOTIFY ((1) << 31) |
307 | |
308 | struct sbp2_command_orb { |
309 | struct sbp2_orb base; |
310 | struct { |
311 | struct sbp2_pointer next; |
312 | struct sbp2_pointer data_descriptor; |
313 | __be32 misc; |
314 | u8 command_block[SBP2_MAX_CDB_SIZE]; |
315 | } request; |
316 | struct scsi_cmnd *cmd; |
317 | scsi_done_fn_t done; |
318 | struct sbp2_logical_unit *lu; |
319 | |
320 | struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8))); |
321 | dma_addr_t page_table_bus; |
322 | }; |
323 | |
324 | #define SBP2_ROM_VALUE_WILDCARD ~0 /* match all */ |
325 | #define SBP2_ROM_VALUE_MISSING 0xff000000 /* not present in the unit dir. */ |
326 | |
327 | /* |
328 | * List of devices with known bugs. |
329 | * |
330 | * The firmware_revision field, masked with 0xffff00, is the best |
331 | * indicator for the type of bridge chip of a device. It yields a few |
332 | * false positives but this did not break correctly behaving devices |
333 | * so far. |
334 | */ |
335 | static const struct { |
336 | u32 firmware_revision; |
337 | u32 model; |
338 | unsigned int workarounds; |
339 | } sbp2_workarounds_table[] = { |
340 | /* DViCO Momobay CX-1 with TSB42AA9 bridge */ { |
341 | .firmware_revision = 0x002800, |
342 | .model = 0x001010, |
343 | .workarounds = SBP2_WORKAROUND_INQUIRY_36 | |
344 | SBP2_WORKAROUND_MODE_SENSE_8 | |
345 | SBP2_WORKAROUND_POWER_CONDITION, |
346 | }, |
347 | /* DViCO Momobay FX-3A with TSB42AA9A bridge */ { |
348 | .firmware_revision = 0x002800, |
349 | .model = 0x000000, |
350 | .workarounds = SBP2_WORKAROUND_POWER_CONDITION, |
351 | }, |
352 | /* Initio bridges, actually only needed for some older ones */ { |
353 | .firmware_revision = 0x000200, |
354 | .model = SBP2_ROM_VALUE_WILDCARD, |
355 | .workarounds = SBP2_WORKAROUND_INQUIRY_36, |
356 | }, |
357 | /* PL-3507 bridge with Prolific firmware */ { |
358 | .firmware_revision = 0x012800, |
359 | .model = SBP2_ROM_VALUE_WILDCARD, |
360 | .workarounds = SBP2_WORKAROUND_POWER_CONDITION, |
361 | }, |
362 | /* Symbios bridge */ { |
363 | .firmware_revision = 0xa0b800, |
364 | .model = SBP2_ROM_VALUE_WILDCARD, |
365 | .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, |
366 | }, |
367 | /* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ { |
368 | .firmware_revision = 0x002600, |
369 | .model = SBP2_ROM_VALUE_WILDCARD, |
370 | .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, |
371 | }, |
372 | /* |
373 | * iPod 2nd generation: needs 128k max transfer size workaround |
374 | * iPod 3rd generation: needs fix capacity workaround |
375 | */ |
376 | { |
377 | .firmware_revision = 0x0a2700, |
378 | .model = 0x000000, |
379 | .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS | |
380 | SBP2_WORKAROUND_FIX_CAPACITY, |
381 | }, |
382 | /* iPod 4th generation */ { |
383 | .firmware_revision = 0x0a2700, |
384 | .model = 0x000021, |
385 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, |
386 | }, |
387 | /* iPod mini */ { |
388 | .firmware_revision = 0x0a2700, |
389 | .model = 0x000022, |
390 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, |
391 | }, |
392 | /* iPod mini */ { |
393 | .firmware_revision = 0x0a2700, |
394 | .model = 0x000023, |
395 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, |
396 | }, |
397 | /* iPod Photo */ { |
398 | .firmware_revision = 0x0a2700, |
399 | .model = 0x00007e, |
400 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, |
401 | } |
402 | }; |
403 | |
404 | static void free_orb(struct kref *kref) |
405 | { |
406 | struct sbp2_orb *orb = container_of(kref, struct sbp2_orb, kref); |
407 | |
408 | kfree(orb); |
409 | } |
410 | |
411 | static void sbp2_status_write(struct fw_card *card, struct fw_request *request, |
412 | int tcode, int destination, int source, |
413 | int generation, unsigned long long offset, |
414 | void *payload, size_t length, void *callback_data) |
415 | { |
416 | struct sbp2_logical_unit *lu = callback_data; |
417 | struct sbp2_orb *orb; |
418 | struct sbp2_status status; |
419 | unsigned long flags; |
420 | |
421 | if (tcode != TCODE_WRITE_BLOCK_REQUEST || |
422 | length < 8 || length > sizeof(status)) { |
423 | fw_send_response(card, request, RCODE_TYPE_ERROR); |
424 | return; |
425 | } |
426 | |
427 | status.status = be32_to_cpup(payload); |
428 | status.orb_low = be32_to_cpup(payload + 4); |
429 | memset(status.data, 0, sizeof(status.data)); |
430 | if (length > 8) |
431 | memcpy(status.data, payload + 8, length - 8); |
432 | |
433 | if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) { |
434 | fw_notify("non-orb related status write, not handled\n"); |
435 | fw_send_response(card, request, RCODE_COMPLETE); |
436 | return; |
437 | } |
438 | |
439 | /* Lookup the orb corresponding to this status write. */ |
440 | spin_lock_irqsave(&card->lock, flags); |
441 | list_for_each_entry(orb, &lu->orb_list, link) { |
442 | if (STATUS_GET_ORB_HIGH(status) == 0 && |
443 | STATUS_GET_ORB_LOW(status) == orb->request_bus) { |
444 | orb->rcode = RCODE_COMPLETE; |
445 | list_del(&orb->link); |
446 | break; |
447 | } |
448 | } |
449 | spin_unlock_irqrestore(&card->lock, flags); |
450 | |
451 | if (&orb->link != &lu->orb_list) { |
452 | orb->callback(orb, &status); |
453 | kref_put(&orb->kref, free_orb); /* orb callback reference */ |
454 | } else { |
455 | fw_error("status write for unknown orb\n"); |
456 | } |
457 | |
458 | fw_send_response(card, request, RCODE_COMPLETE); |
459 | } |
460 | |
461 | static void complete_transaction(struct fw_card *card, int rcode, |
462 | void *payload, size_t length, void *data) |
463 | { |
464 | struct sbp2_orb *orb = data; |
465 | unsigned long flags; |
466 | |
467 | /* |
468 | * This is a little tricky. We can get the status write for |
469 | * the orb before we get this callback. The status write |
470 | * handler above will assume the orb pointer transaction was |
471 | * successful and set the rcode to RCODE_COMPLETE for the orb. |
472 | * So this callback only sets the rcode if it hasn't already |
473 | * been set and only does the cleanup if the transaction |
474 | * failed and we didn't already get a status write. |
475 | * |
476 | * Here we treat RCODE_CANCELLED like RCODE_COMPLETE because some |
477 | * OXUF936QSE firmwares occasionally respond after Split_Timeout and |
478 | * complete the ORB just fine. Note, we also get RCODE_CANCELLED |
479 | * from sbp2_cancel_orbs() if fw_cancel_transaction() == 0. |
480 | */ |
481 | spin_lock_irqsave(&card->lock, flags); |
482 | |
483 | if (orb->rcode == -1) |
484 | orb->rcode = rcode; |
485 | |
486 | if (orb->rcode != RCODE_COMPLETE && orb->rcode != RCODE_CANCELLED) { |
487 | list_del(&orb->link); |
488 | spin_unlock_irqrestore(&card->lock, flags); |
489 | |
490 | orb->callback(orb, NULL); |
491 | kref_put(&orb->kref, free_orb); /* orb callback reference */ |
492 | } else { |
493 | spin_unlock_irqrestore(&card->lock, flags); |
494 | } |
495 | |
496 | kref_put(&orb->kref, free_orb); /* transaction callback reference */ |
497 | } |
498 | |
499 | static void sbp2_send_orb(struct sbp2_orb *orb, struct sbp2_logical_unit *lu, |
500 | int node_id, int generation, u64 offset) |
501 | { |
502 | struct fw_device *device = target_device(lu->tgt); |
503 | unsigned long flags; |
504 | |
505 | orb->pointer.high = 0; |
506 | orb->pointer.low = cpu_to_be32(orb->request_bus); |
507 | |
508 | spin_lock_irqsave(&device->card->lock, flags); |
509 | list_add_tail(&orb->link, &lu->orb_list); |
510 | spin_unlock_irqrestore(&device->card->lock, flags); |
511 | |
512 | kref_get(&orb->kref); /* transaction callback reference */ |
513 | kref_get(&orb->kref); /* orb callback reference */ |
514 | |
515 | fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST, |
516 | node_id, generation, device->max_speed, offset, |
517 | &orb->pointer, 8, complete_transaction, orb); |
518 | } |
519 | |
520 | static int sbp2_cancel_orbs(struct sbp2_logical_unit *lu) |
521 | { |
522 | struct fw_device *device = target_device(lu->tgt); |
523 | struct sbp2_orb *orb, *next; |
524 | struct list_head list; |
525 | unsigned long flags; |
526 | int retval = -ENOENT; |
527 | |
528 | INIT_LIST_HEAD(&list); |
529 | spin_lock_irqsave(&device->card->lock, flags); |
530 | list_splice_init(&lu->orb_list, &list); |
531 | spin_unlock_irqrestore(&device->card->lock, flags); |
532 | |
533 | list_for_each_entry_safe(orb, next, &list, link) { |
534 | retval = 0; |
535 | fw_cancel_transaction(device->card, &orb->t); |
536 | |
537 | orb->rcode = RCODE_CANCELLED; |
538 | orb->callback(orb, NULL); |
539 | kref_put(&orb->kref, free_orb); /* orb callback reference */ |
540 | } |
541 | |
542 | return retval; |
543 | } |
544 | |
545 | static void complete_management_orb(struct sbp2_orb *base_orb, |
546 | struct sbp2_status *status) |
547 | { |
548 | struct sbp2_management_orb *orb = |
549 | container_of(base_orb, struct sbp2_management_orb, base); |
550 | |
551 | if (status) |
552 | memcpy(&orb->status, status, sizeof(*status)); |
553 | complete(&orb->done); |
554 | } |
555 | |
556 | static int sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id, |
557 | int generation, int function, |
558 | int lun_or_login_id, void *response) |
559 | { |
560 | struct fw_device *device = target_device(lu->tgt); |
561 | struct sbp2_management_orb *orb; |
562 | unsigned int timeout; |
563 | int retval = -ENOMEM; |
564 | |
565 | if (function == SBP2_LOGOUT_REQUEST && fw_device_is_shutdown(device)) |
566 | return 0; |
567 | |
568 | orb = kzalloc(sizeof(*orb), GFP_ATOMIC); |
569 | if (orb == NULL) |
570 | return -ENOMEM; |
571 | |
572 | kref_init(&orb->base.kref); |
573 | orb->response_bus = |
574 | dma_map_single(device->card->device, &orb->response, |
575 | sizeof(orb->response), DMA_FROM_DEVICE); |
576 | if (dma_mapping_error(device->card->device, orb->response_bus)) |
577 | goto fail_mapping_response; |
578 | |
579 | orb->request.response.high = 0; |
580 | orb->request.response.low = cpu_to_be32(orb->response_bus); |
581 | |
582 | orb->request.misc = cpu_to_be32( |
583 | MANAGEMENT_ORB_NOTIFY | |
584 | MANAGEMENT_ORB_FUNCTION(function) | |
585 | MANAGEMENT_ORB_LUN(lun_or_login_id)); |
586 | orb->request.length = cpu_to_be32( |
587 | MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response))); |
588 | |
589 | orb->request.status_fifo.high = |
590 | cpu_to_be32(lu->address_handler.offset >> 32); |
591 | orb->request.status_fifo.low = |
592 | cpu_to_be32(lu->address_handler.offset); |
593 | |
594 | if (function == SBP2_LOGIN_REQUEST) { |
595 | /* Ask for 2^2 == 4 seconds reconnect grace period */ |
596 | orb->request.misc |= cpu_to_be32( |
597 | MANAGEMENT_ORB_RECONNECT(2) | |
598 | MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login)); |
599 | timeout = lu->tgt->mgt_orb_timeout; |
600 | } else { |
601 | timeout = SBP2_ORB_TIMEOUT; |
602 | } |
603 | |
604 | init_completion(&orb->done); |
605 | orb->base.callback = complete_management_orb; |
606 | |
607 | orb->base.request_bus = |
608 | dma_map_single(device->card->device, &orb->request, |
609 | sizeof(orb->request), DMA_TO_DEVICE); |
610 | if (dma_mapping_error(device->card->device, orb->base.request_bus)) |
611 | goto fail_mapping_request; |
612 | |
613 | sbp2_send_orb(&orb->base, lu, node_id, generation, |
614 | lu->tgt->management_agent_address); |
615 | |
616 | wait_for_completion_timeout(&orb->done, msecs_to_jiffies(timeout)); |
617 | |
618 | retval = -EIO; |
619 | if (sbp2_cancel_orbs(lu) == 0) { |
620 | fw_error("%s: orb reply timed out, rcode=0x%02x\n", |
621 | lu->tgt->bus_id, orb->base.rcode); |
622 | goto out; |
623 | } |
624 | |
625 | if (orb->base.rcode != RCODE_COMPLETE) { |
626 | fw_error("%s: management write failed, rcode 0x%02x\n", |
627 | lu->tgt->bus_id, orb->base.rcode); |
628 | goto out; |
629 | } |
630 | |
631 | if (STATUS_GET_RESPONSE(orb->status) != 0 || |
632 | STATUS_GET_SBP_STATUS(orb->status) != 0) { |
633 | fw_error("%s: error status: %d:%d\n", lu->tgt->bus_id, |
634 | STATUS_GET_RESPONSE(orb->status), |
635 | STATUS_GET_SBP_STATUS(orb->status)); |
636 | goto out; |
637 | } |
638 | |
639 | retval = 0; |
640 | out: |
641 | dma_unmap_single(device->card->device, orb->base.request_bus, |
642 | sizeof(orb->request), DMA_TO_DEVICE); |
643 | fail_mapping_request: |
644 | dma_unmap_single(device->card->device, orb->response_bus, |
645 | sizeof(orb->response), DMA_FROM_DEVICE); |
646 | fail_mapping_response: |
647 | if (response) |
648 | memcpy(response, orb->response, sizeof(orb->response)); |
649 | kref_put(&orb->base.kref, free_orb); |
650 | |
651 | return retval; |
652 | } |
653 | |
654 | static void sbp2_agent_reset(struct sbp2_logical_unit *lu) |
655 | { |
656 | struct fw_device *device = target_device(lu->tgt); |
657 | __be32 d = 0; |
658 | |
659 | fw_run_transaction(device->card, TCODE_WRITE_QUADLET_REQUEST, |
660 | lu->tgt->node_id, lu->generation, device->max_speed, |
661 | lu->command_block_agent_address + SBP2_AGENT_RESET, |
662 | &d, 4); |
663 | } |
664 | |
665 | static void complete_agent_reset_write_no_wait(struct fw_card *card, |
666 | int rcode, void *payload, size_t length, void *data) |
667 | { |
668 | kfree(data); |
669 | } |
670 | |
671 | static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu) |
672 | { |
673 | struct fw_device *device = target_device(lu->tgt); |
674 | struct fw_transaction *t; |
675 | static __be32 d; |
676 | |
677 | t = kmalloc(sizeof(*t), GFP_ATOMIC); |
678 | if (t == NULL) |
679 | return; |
680 | |
681 | fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST, |
682 | lu->tgt->node_id, lu->generation, device->max_speed, |
683 | lu->command_block_agent_address + SBP2_AGENT_RESET, |
684 | &d, 4, complete_agent_reset_write_no_wait, t); |
685 | } |
686 | |
687 | static inline void sbp2_allow_block(struct sbp2_logical_unit *lu) |
688 | { |
689 | /* |
690 | * We may access dont_block without taking card->lock here: |
691 | * All callers of sbp2_allow_block() and all callers of sbp2_unblock() |
692 | * are currently serialized against each other. |
693 | * And a wrong result in sbp2_conditionally_block()'s access of |
694 | * dont_block is rather harmless, it simply misses its first chance. |
695 | */ |
696 | --lu->tgt->dont_block; |
697 | } |
698 | |
699 | /* |
700 | * Blocks lu->tgt if all of the following conditions are met: |
701 | * - Login, INQUIRY, and high-level SCSI setup of all of the target's |
702 | * logical units have been finished (indicated by dont_block == 0). |
703 | * - lu->generation is stale. |
704 | * |
705 | * Note, scsi_block_requests() must be called while holding card->lock, |
706 | * otherwise it might foil sbp2_[conditionally_]unblock()'s attempt to |
707 | * unblock the target. |
708 | */ |
709 | static void sbp2_conditionally_block(struct sbp2_logical_unit *lu) |
710 | { |
711 | struct sbp2_target *tgt = lu->tgt; |
712 | struct fw_card *card = target_device(tgt)->card; |
713 | struct Scsi_Host *shost = |
714 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
715 | unsigned long flags; |
716 | |
717 | spin_lock_irqsave(&card->lock, flags); |
718 | if (!tgt->dont_block && !lu->blocked && |
719 | lu->generation != card->generation) { |
720 | lu->blocked = true; |
721 | if (++tgt->blocked == 1) |
722 | scsi_block_requests(shost); |
723 | } |
724 | spin_unlock_irqrestore(&card->lock, flags); |
725 | } |
726 | |
727 | /* |
728 | * Unblocks lu->tgt as soon as all its logical units can be unblocked. |
729 | * Note, it is harmless to run scsi_unblock_requests() outside the |
730 | * card->lock protected section. On the other hand, running it inside |
731 | * the section might clash with shost->host_lock. |
732 | */ |
733 | static void sbp2_conditionally_unblock(struct sbp2_logical_unit *lu) |
734 | { |
735 | struct sbp2_target *tgt = lu->tgt; |
736 | struct fw_card *card = target_device(tgt)->card; |
737 | struct Scsi_Host *shost = |
738 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
739 | unsigned long flags; |
740 | bool unblock = false; |
741 | |
742 | spin_lock_irqsave(&card->lock, flags); |
743 | if (lu->blocked && lu->generation == card->generation) { |
744 | lu->blocked = false; |
745 | unblock = --tgt->blocked == 0; |
746 | } |
747 | spin_unlock_irqrestore(&card->lock, flags); |
748 | |
749 | if (unblock) |
750 | scsi_unblock_requests(shost); |
751 | } |
752 | |
753 | /* |
754 | * Prevents future blocking of tgt and unblocks it. |
755 | * Note, it is harmless to run scsi_unblock_requests() outside the |
756 | * card->lock protected section. On the other hand, running it inside |
757 | * the section might clash with shost->host_lock. |
758 | */ |
759 | static void sbp2_unblock(struct sbp2_target *tgt) |
760 | { |
761 | struct fw_card *card = target_device(tgt)->card; |
762 | struct Scsi_Host *shost = |
763 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
764 | unsigned long flags; |
765 | |
766 | spin_lock_irqsave(&card->lock, flags); |
767 | ++tgt->dont_block; |
768 | spin_unlock_irqrestore(&card->lock, flags); |
769 | |
770 | scsi_unblock_requests(shost); |
771 | } |
772 | |
773 | static int sbp2_lun2int(u16 lun) |
774 | { |
775 | struct scsi_lun eight_bytes_lun; |
776 | |
777 | memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun)); |
778 | eight_bytes_lun.scsi_lun[0] = (lun >> 8) & 0xff; |
779 | eight_bytes_lun.scsi_lun[1] = lun & 0xff; |
780 | |
781 | return scsilun_to_int(&eight_bytes_lun); |
782 | } |
783 | |
784 | static void sbp2_release_target(struct kref *kref) |
785 | { |
786 | struct sbp2_target *tgt = container_of(kref, struct sbp2_target, kref); |
787 | struct sbp2_logical_unit *lu, *next; |
788 | struct Scsi_Host *shost = |
789 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
790 | struct scsi_device *sdev; |
791 | struct fw_device *device = target_device(tgt); |
792 | |
793 | /* prevent deadlocks */ |
794 | sbp2_unblock(tgt); |
795 | |
796 | list_for_each_entry_safe(lu, next, &tgt->lu_list, link) { |
797 | sdev = scsi_device_lookup(shost, 0, 0, sbp2_lun2int(lu->lun)); |
798 | if (sdev) { |
799 | scsi_remove_device(sdev); |
800 | scsi_device_put(sdev); |
801 | } |
802 | if (lu->login_id != INVALID_LOGIN_ID) { |
803 | int generation, node_id; |
804 | /* |
805 | * tgt->node_id may be obsolete here if we failed |
806 | * during initial login or after a bus reset where |
807 | * the topology changed. |
808 | */ |
809 | generation = device->generation; |
810 | smp_rmb(); /* node_id vs. generation */ |
811 | node_id = device->node_id; |
812 | sbp2_send_management_orb(lu, node_id, generation, |
813 | SBP2_LOGOUT_REQUEST, |
814 | lu->login_id, NULL); |
815 | } |
816 | fw_core_remove_address_handler(&lu->address_handler); |
817 | list_del(&lu->link); |
818 | kfree(lu); |
819 | } |
820 | scsi_remove_host(shost); |
821 | fw_notify("released %s, target %d:0:0\n", tgt->bus_id, shost->host_no); |
822 | |
823 | fw_unit_put(tgt->unit); |
824 | scsi_host_put(shost); |
825 | fw_device_put(device); |
826 | } |
827 | |
828 | static void sbp2_target_get(struct sbp2_target *tgt) |
829 | { |
830 | kref_get(&tgt->kref); |
831 | } |
832 | |
833 | static void sbp2_target_put(struct sbp2_target *tgt) |
834 | { |
835 | kref_put(&tgt->kref, sbp2_release_target); |
836 | } |
837 | |
838 | static struct workqueue_struct *sbp2_wq; |
839 | |
840 | /* |
841 | * Always get the target's kref when scheduling work on one its units. |
842 | * Each workqueue job is responsible to call sbp2_target_put() upon return. |
843 | */ |
844 | static void sbp2_queue_work(struct sbp2_logical_unit *lu, unsigned long delay) |
845 | { |
846 | sbp2_target_get(lu->tgt); |
847 | if (!queue_delayed_work(sbp2_wq, &lu->work, delay)) |
848 | sbp2_target_put(lu->tgt); |
849 | } |
850 | |
851 | /* |
852 | * Write retransmit retry values into the BUSY_TIMEOUT register. |
853 | * - The single-phase retry protocol is supported by all SBP-2 devices, but the |
854 | * default retry_limit value is 0 (i.e. never retry transmission). We write a |
855 | * saner value after logging into the device. |
856 | * - The dual-phase retry protocol is optional to implement, and if not |
857 | * supported, writes to the dual-phase portion of the register will be |
858 | * ignored. We try to write the original 1394-1995 default here. |
859 | * - In the case of devices that are also SBP-3-compliant, all writes are |
860 | * ignored, as the register is read-only, but contains single-phase retry of |
861 | * 15, which is what we're trying to set for all SBP-2 device anyway, so this |
862 | * write attempt is safe and yields more consistent behavior for all devices. |
863 | * |
864 | * See section 8.3.2.3.5 of the 1394-1995 spec, section 6.2 of the SBP-2 spec, |
865 | * and section 6.4 of the SBP-3 spec for further details. |
866 | */ |
867 | static void sbp2_set_busy_timeout(struct sbp2_logical_unit *lu) |
868 | { |
869 | struct fw_device *device = target_device(lu->tgt); |
870 | __be32 d = cpu_to_be32(SBP2_CYCLE_LIMIT | SBP2_RETRY_LIMIT); |
871 | |
872 | fw_run_transaction(device->card, TCODE_WRITE_QUADLET_REQUEST, |
873 | lu->tgt->node_id, lu->generation, device->max_speed, |
874 | CSR_REGISTER_BASE + CSR_BUSY_TIMEOUT, &d, 4); |
875 | } |
876 | |
877 | static void sbp2_reconnect(struct work_struct *work); |
878 | |
879 | static void sbp2_login(struct work_struct *work) |
880 | { |
881 | struct sbp2_logical_unit *lu = |
882 | container_of(work, struct sbp2_logical_unit, work.work); |
883 | struct sbp2_target *tgt = lu->tgt; |
884 | struct fw_device *device = target_device(tgt); |
885 | struct Scsi_Host *shost; |
886 | struct scsi_device *sdev; |
887 | struct sbp2_login_response response; |
888 | int generation, node_id, local_node_id; |
889 | |
890 | if (fw_device_is_shutdown(device)) |
891 | goto out; |
892 | |
893 | generation = device->generation; |
894 | smp_rmb(); /* node IDs must not be older than generation */ |
895 | node_id = device->node_id; |
896 | local_node_id = device->card->node_id; |
897 | |
898 | /* If this is a re-login attempt, log out, or we might be rejected. */ |
899 | if (lu->has_sdev) |
900 | sbp2_send_management_orb(lu, device->node_id, generation, |
901 | SBP2_LOGOUT_REQUEST, lu->login_id, NULL); |
902 | |
903 | if (sbp2_send_management_orb(lu, node_id, generation, |
904 | SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) { |
905 | if (lu->retries++ < 5) { |
906 | sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5)); |
907 | } else { |
908 | fw_error("%s: failed to login to LUN %04x\n", |
909 | tgt->bus_id, lu->lun); |
910 | /* Let any waiting I/O fail from now on. */ |
911 | sbp2_unblock(lu->tgt); |
912 | } |
913 | goto out; |
914 | } |
915 | |
916 | tgt->node_id = node_id; |
917 | tgt->address_high = local_node_id << 16; |
918 | smp_wmb(); /* node IDs must not be older than generation */ |
919 | lu->generation = generation; |
920 | |
921 | lu->command_block_agent_address = |
922 | ((u64)(be32_to_cpu(response.command_block_agent.high) & 0xffff) |
923 | << 32) | be32_to_cpu(response.command_block_agent.low); |
924 | lu->login_id = be32_to_cpu(response.misc) & 0xffff; |
925 | |
926 | fw_notify("%s: logged in to LUN %04x (%d retries)\n", |
927 | tgt->bus_id, lu->lun, lu->retries); |
928 | |
929 | /* set appropriate retry limit(s) in BUSY_TIMEOUT register */ |
930 | sbp2_set_busy_timeout(lu); |
931 | |
932 | PREPARE_DELAYED_WORK(&lu->work, sbp2_reconnect); |
933 | sbp2_agent_reset(lu); |
934 | |
935 | /* This was a re-login. */ |
936 | if (lu->has_sdev) { |
937 | sbp2_cancel_orbs(lu); |
938 | sbp2_conditionally_unblock(lu); |
939 | goto out; |
940 | } |
941 | |
942 | if (lu->tgt->workarounds & SBP2_WORKAROUND_DELAY_INQUIRY) |
943 | ssleep(SBP2_INQUIRY_DELAY); |
944 | |
945 | shost = container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
946 | sdev = __scsi_add_device(shost, 0, 0, sbp2_lun2int(lu->lun), lu); |
947 | /* |
948 | * FIXME: We are unable to perform reconnects while in sbp2_login(). |
949 | * Therefore __scsi_add_device() will get into trouble if a bus reset |
950 | * happens in parallel. It will either fail or leave us with an |
951 | * unusable sdev. As a workaround we check for this and retry the |
952 | * whole login and SCSI probing. |
953 | */ |
954 | |
955 | /* Reported error during __scsi_add_device() */ |
956 | if (IS_ERR(sdev)) |
957 | goto out_logout_login; |
958 | |
959 | /* Unreported error during __scsi_add_device() */ |
960 | smp_rmb(); /* get current card generation */ |
961 | if (generation != device->card->generation) { |
962 | scsi_remove_device(sdev); |
963 | scsi_device_put(sdev); |
964 | goto out_logout_login; |
965 | } |
966 | |
967 | /* No error during __scsi_add_device() */ |
968 | lu->has_sdev = true; |
969 | scsi_device_put(sdev); |
970 | sbp2_allow_block(lu); |
971 | goto out; |
972 | |
973 | out_logout_login: |
974 | smp_rmb(); /* generation may have changed */ |
975 | generation = device->generation; |
976 | smp_rmb(); /* node_id must not be older than generation */ |
977 | |
978 | sbp2_send_management_orb(lu, device->node_id, generation, |
979 | SBP2_LOGOUT_REQUEST, lu->login_id, NULL); |
980 | /* |
981 | * If a bus reset happened, sbp2_update will have requeued |
982 | * lu->work already. Reset the work from reconnect to login. |
983 | */ |
984 | PREPARE_DELAYED_WORK(&lu->work, sbp2_login); |
985 | out: |
986 | sbp2_target_put(tgt); |
987 | } |
988 | |
989 | static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry) |
990 | { |
991 | struct sbp2_logical_unit *lu; |
992 | |
993 | lu = kmalloc(sizeof(*lu), GFP_KERNEL); |
994 | if (!lu) |
995 | return -ENOMEM; |
996 | |
997 | lu->address_handler.length = 0x100; |
998 | lu->address_handler.address_callback = sbp2_status_write; |
999 | lu->address_handler.callback_data = lu; |
1000 | |
1001 | if (fw_core_add_address_handler(&lu->address_handler, |
1002 | &fw_high_memory_region) < 0) { |
1003 | kfree(lu); |
1004 | return -ENOMEM; |
1005 | } |
1006 | |
1007 | lu->tgt = tgt; |
1008 | lu->lun = lun_entry & 0xffff; |
1009 | lu->login_id = INVALID_LOGIN_ID; |
1010 | lu->retries = 0; |
1011 | lu->has_sdev = false; |
1012 | lu->blocked = false; |
1013 | ++tgt->dont_block; |
1014 | INIT_LIST_HEAD(&lu->orb_list); |
1015 | INIT_DELAYED_WORK(&lu->work, sbp2_login); |
1016 | |
1017 | list_add_tail(&lu->link, &tgt->lu_list); |
1018 | return 0; |
1019 | } |
1020 | |
1021 | static int sbp2_scan_logical_unit_dir(struct sbp2_target *tgt, |
1022 | const u32 *directory) |
1023 | { |
1024 | struct fw_csr_iterator ci; |
1025 | int key, value; |
1026 | |
1027 | fw_csr_iterator_init(&ci, directory); |
1028 | while (fw_csr_iterator_next(&ci, &key, &value)) |
1029 | if (key == SBP2_CSR_LOGICAL_UNIT_NUMBER && |
1030 | sbp2_add_logical_unit(tgt, value) < 0) |
1031 | return -ENOMEM; |
1032 | return 0; |
1033 | } |
1034 | |
1035 | static int sbp2_scan_unit_dir(struct sbp2_target *tgt, const u32 *directory, |
1036 | u32 *model, u32 *firmware_revision) |
1037 | { |
1038 | struct fw_csr_iterator ci; |
1039 | int key, value; |
1040 | |
1041 | fw_csr_iterator_init(&ci, directory); |
1042 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
1043 | switch (key) { |
1044 | |
1045 | case CSR_DEPENDENT_INFO | CSR_OFFSET: |
1046 | tgt->management_agent_address = |
1047 | CSR_REGISTER_BASE + 4 * value; |
1048 | break; |
1049 | |
1050 | case CSR_DIRECTORY_ID: |
1051 | tgt->directory_id = value; |
1052 | break; |
1053 | |
1054 | case CSR_MODEL: |
1055 | *model = value; |
1056 | break; |
1057 | |
1058 | case SBP2_CSR_FIRMWARE_REVISION: |
1059 | *firmware_revision = value; |
1060 | break; |
1061 | |
1062 | case SBP2_CSR_UNIT_CHARACTERISTICS: |
1063 | /* the timeout value is stored in 500ms units */ |
1064 | tgt->mgt_orb_timeout = (value >> 8 & 0xff) * 500; |
1065 | break; |
1066 | |
1067 | case SBP2_CSR_LOGICAL_UNIT_NUMBER: |
1068 | if (sbp2_add_logical_unit(tgt, value) < 0) |
1069 | return -ENOMEM; |
1070 | break; |
1071 | |
1072 | case SBP2_CSR_LOGICAL_UNIT_DIRECTORY: |
1073 | /* Adjust for the increment in the iterator */ |
1074 | if (sbp2_scan_logical_unit_dir(tgt, ci.p - 1 + value) < 0) |
1075 | return -ENOMEM; |
1076 | break; |
1077 | } |
1078 | } |
1079 | return 0; |
1080 | } |
1081 | |
1082 | /* |
1083 | * Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be |
1084 | * provided in the config rom. Most devices do provide a value, which |
1085 | * we'll use for login management orbs, but with some sane limits. |
1086 | */ |
1087 | static void sbp2_clamp_management_orb_timeout(struct sbp2_target *tgt) |
1088 | { |
1089 | unsigned int timeout = tgt->mgt_orb_timeout; |
1090 | |
1091 | if (timeout > 40000) |
1092 | fw_notify("%s: %ds mgt_ORB_timeout limited to 40s\n", |
1093 | tgt->bus_id, timeout / 1000); |
1094 | |
1095 | tgt->mgt_orb_timeout = clamp_val(timeout, 5000, 40000); |
1096 | } |
1097 | |
1098 | static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model, |
1099 | u32 firmware_revision) |
1100 | { |
1101 | int i; |
1102 | unsigned int w = sbp2_param_workarounds; |
1103 | |
1104 | if (w) |
1105 | fw_notify("Please notify linux1394-devel@lists.sourceforge.net " |
1106 | "if you need the workarounds parameter for %s\n", |
1107 | tgt->bus_id); |
1108 | |
1109 | if (w & SBP2_WORKAROUND_OVERRIDE) |
1110 | goto out; |
1111 | |
1112 | for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) { |
1113 | |
1114 | if (sbp2_workarounds_table[i].firmware_revision != |
1115 | (firmware_revision & 0xffffff00)) |
1116 | continue; |
1117 | |
1118 | if (sbp2_workarounds_table[i].model != model && |
1119 | sbp2_workarounds_table[i].model != SBP2_ROM_VALUE_WILDCARD) |
1120 | continue; |
1121 | |
1122 | w |= sbp2_workarounds_table[i].workarounds; |
1123 | break; |
1124 | } |
1125 | out: |
1126 | if (w) |
1127 | fw_notify("Workarounds for %s: 0x%x " |
1128 | "(firmware_revision 0x%06x, model_id 0x%06x)\n", |
1129 | tgt->bus_id, w, firmware_revision, model); |
1130 | tgt->workarounds = w; |
1131 | } |
1132 | |
1133 | static struct scsi_host_template scsi_driver_template; |
1134 | |
1135 | static int sbp2_probe(struct device *dev) |
1136 | { |
1137 | struct fw_unit *unit = fw_unit(dev); |
1138 | struct fw_device *device = fw_parent_device(unit); |
1139 | struct sbp2_target *tgt; |
1140 | struct sbp2_logical_unit *lu; |
1141 | struct Scsi_Host *shost; |
1142 | u32 model, firmware_revision; |
1143 | |
1144 | if (dma_get_max_seg_size(device->card->device) > SBP2_MAX_SEG_SIZE) |
1145 | BUG_ON(dma_set_max_seg_size(device->card->device, |
1146 | SBP2_MAX_SEG_SIZE)); |
1147 | |
1148 | shost = scsi_host_alloc(&scsi_driver_template, sizeof(*tgt)); |
1149 | if (shost == NULL) |
1150 | return -ENOMEM; |
1151 | |
1152 | tgt = (struct sbp2_target *)shost->hostdata; |
1153 | dev_set_drvdata(&unit->device, tgt); |
1154 | tgt->unit = unit; |
1155 | kref_init(&tgt->kref); |
1156 | INIT_LIST_HEAD(&tgt->lu_list); |
1157 | tgt->bus_id = dev_name(&unit->device); |
1158 | tgt->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4]; |
1159 | |
1160 | if (fw_device_enable_phys_dma(device) < 0) |
1161 | goto fail_shost_put; |
1162 | |
1163 | shost->max_cmd_len = SBP2_MAX_CDB_SIZE; |
1164 | |
1165 | if (scsi_add_host(shost, &unit->device) < 0) |
1166 | goto fail_shost_put; |
1167 | |
1168 | fw_device_get(device); |
1169 | fw_unit_get(unit); |
1170 | |
1171 | /* implicit directory ID */ |
1172 | tgt->directory_id = ((unit->directory - device->config_rom) * 4 |
1173 | + CSR_CONFIG_ROM) & 0xffffff; |
1174 | |
1175 | firmware_revision = SBP2_ROM_VALUE_MISSING; |
1176 | model = SBP2_ROM_VALUE_MISSING; |
1177 | |
1178 | if (sbp2_scan_unit_dir(tgt, unit->directory, &model, |
1179 | &firmware_revision) < 0) |
1180 | goto fail_tgt_put; |
1181 | |
1182 | sbp2_clamp_management_orb_timeout(tgt); |
1183 | sbp2_init_workarounds(tgt, model, firmware_revision); |
1184 | |
1185 | /* |
1186 | * At S100 we can do 512 bytes per packet, at S200 1024 bytes, |
1187 | * and so on up to 4096 bytes. The SBP-2 max_payload field |
1188 | * specifies the max payload size as 2 ^ (max_payload + 2), so |
1189 | * if we set this to max_speed + 7, we get the right value. |
1190 | */ |
1191 | tgt->max_payload = min(device->max_speed + 7, 10U); |
1192 | tgt->max_payload = min(tgt->max_payload, device->card->max_receive - 1); |
1193 | |
1194 | /* Do the login in a workqueue so we can easily reschedule retries. */ |
1195 | list_for_each_entry(lu, &tgt->lu_list, link) |
1196 | sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5)); |
1197 | return 0; |
1198 | |
1199 | fail_tgt_put: |
1200 | sbp2_target_put(tgt); |
1201 | return -ENOMEM; |
1202 | |
1203 | fail_shost_put: |
1204 | scsi_host_put(shost); |
1205 | return -ENOMEM; |
1206 | } |
1207 | |
1208 | static int sbp2_remove(struct device *dev) |
1209 | { |
1210 | struct fw_unit *unit = fw_unit(dev); |
1211 | struct sbp2_target *tgt = dev_get_drvdata(&unit->device); |
1212 | |
1213 | sbp2_target_put(tgt); |
1214 | return 0; |
1215 | } |
1216 | |
1217 | static void sbp2_reconnect(struct work_struct *work) |
1218 | { |
1219 | struct sbp2_logical_unit *lu = |
1220 | container_of(work, struct sbp2_logical_unit, work.work); |
1221 | struct sbp2_target *tgt = lu->tgt; |
1222 | struct fw_device *device = target_device(tgt); |
1223 | int generation, node_id, local_node_id; |
1224 | |
1225 | if (fw_device_is_shutdown(device)) |
1226 | goto out; |
1227 | |
1228 | generation = device->generation; |
1229 | smp_rmb(); /* node IDs must not be older than generation */ |
1230 | node_id = device->node_id; |
1231 | local_node_id = device->card->node_id; |
1232 | |
1233 | if (sbp2_send_management_orb(lu, node_id, generation, |
1234 | SBP2_RECONNECT_REQUEST, |
1235 | lu->login_id, NULL) < 0) { |
1236 | /* |
1237 | * If reconnect was impossible even though we are in the |
1238 | * current generation, fall back and try to log in again. |
1239 | * |
1240 | * We could check for "Function rejected" status, but |
1241 | * looking at the bus generation as simpler and more general. |
1242 | */ |
1243 | smp_rmb(); /* get current card generation */ |
1244 | if (generation == device->card->generation || |
1245 | lu->retries++ >= 5) { |
1246 | fw_error("%s: failed to reconnect\n", tgt->bus_id); |
1247 | lu->retries = 0; |
1248 | PREPARE_DELAYED_WORK(&lu->work, sbp2_login); |
1249 | } |
1250 | sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5)); |
1251 | goto out; |
1252 | } |
1253 | |
1254 | tgt->node_id = node_id; |
1255 | tgt->address_high = local_node_id << 16; |
1256 | smp_wmb(); /* node IDs must not be older than generation */ |
1257 | lu->generation = generation; |
1258 | |
1259 | fw_notify("%s: reconnected to LUN %04x (%d retries)\n", |
1260 | tgt->bus_id, lu->lun, lu->retries); |
1261 | |
1262 | sbp2_agent_reset(lu); |
1263 | sbp2_cancel_orbs(lu); |
1264 | sbp2_conditionally_unblock(lu); |
1265 | out: |
1266 | sbp2_target_put(tgt); |
1267 | } |
1268 | |
1269 | static void sbp2_update(struct fw_unit *unit) |
1270 | { |
1271 | struct sbp2_target *tgt = dev_get_drvdata(&unit->device); |
1272 | struct sbp2_logical_unit *lu; |
1273 | |
1274 | fw_device_enable_phys_dma(fw_parent_device(unit)); |
1275 | |
1276 | /* |
1277 | * Fw-core serializes sbp2_update() against sbp2_remove(). |
1278 | * Iteration over tgt->lu_list is therefore safe here. |
1279 | */ |
1280 | list_for_each_entry(lu, &tgt->lu_list, link) { |
1281 | sbp2_conditionally_block(lu); |
1282 | lu->retries = 0; |
1283 | sbp2_queue_work(lu, 0); |
1284 | } |
1285 | } |
1286 | |
1287 | #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e |
1288 | #define SBP2_SW_VERSION_ENTRY 0x00010483 |
1289 | |
1290 | static const struct ieee1394_device_id sbp2_id_table[] = { |
1291 | { |
1292 | .match_flags = IEEE1394_MATCH_SPECIFIER_ID | |
1293 | IEEE1394_MATCH_VERSION, |
1294 | .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY, |
1295 | .version = SBP2_SW_VERSION_ENTRY, |
1296 | }, |
1297 | { } |
1298 | }; |
1299 | |
1300 | static struct fw_driver sbp2_driver = { |
1301 | .driver = { |
1302 | .owner = THIS_MODULE, |
1303 | .name = sbp2_driver_name, |
1304 | .bus = &fw_bus_type, |
1305 | .probe = sbp2_probe, |
1306 | .remove = sbp2_remove, |
1307 | }, |
1308 | .update = sbp2_update, |
1309 | .id_table = sbp2_id_table, |
1310 | }; |
1311 | |
1312 | static void sbp2_unmap_scatterlist(struct device *card_device, |
1313 | struct sbp2_command_orb *orb) |
1314 | { |
1315 | if (scsi_sg_count(orb->cmd)) |
1316 | dma_unmap_sg(card_device, scsi_sglist(orb->cmd), |
1317 | scsi_sg_count(orb->cmd), |
1318 | orb->cmd->sc_data_direction); |
1319 | |
1320 | if (orb->request.misc & cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT)) |
1321 | dma_unmap_single(card_device, orb->page_table_bus, |
1322 | sizeof(orb->page_table), DMA_TO_DEVICE); |
1323 | } |
1324 | |
1325 | static unsigned int sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data) |
1326 | { |
1327 | int sam_status; |
1328 | |
1329 | sense_data[0] = 0x70; |
1330 | sense_data[1] = 0x0; |
1331 | sense_data[2] = sbp2_status[1]; |
1332 | sense_data[3] = sbp2_status[4]; |
1333 | sense_data[4] = sbp2_status[5]; |
1334 | sense_data[5] = sbp2_status[6]; |
1335 | sense_data[6] = sbp2_status[7]; |
1336 | sense_data[7] = 10; |
1337 | sense_data[8] = sbp2_status[8]; |
1338 | sense_data[9] = sbp2_status[9]; |
1339 | sense_data[10] = sbp2_status[10]; |
1340 | sense_data[11] = sbp2_status[11]; |
1341 | sense_data[12] = sbp2_status[2]; |
1342 | sense_data[13] = sbp2_status[3]; |
1343 | sense_data[14] = sbp2_status[12]; |
1344 | sense_data[15] = sbp2_status[13]; |
1345 | |
1346 | sam_status = sbp2_status[0] & 0x3f; |
1347 | |
1348 | switch (sam_status) { |
1349 | case SAM_STAT_GOOD: |
1350 | case SAM_STAT_CHECK_CONDITION: |
1351 | case SAM_STAT_CONDITION_MET: |
1352 | case SAM_STAT_BUSY: |
1353 | case SAM_STAT_RESERVATION_CONFLICT: |
1354 | case SAM_STAT_COMMAND_TERMINATED: |
1355 | return DID_OK << 16 | sam_status; |
1356 | |
1357 | default: |
1358 | return DID_ERROR << 16; |
1359 | } |
1360 | } |
1361 | |
1362 | static void complete_command_orb(struct sbp2_orb *base_orb, |
1363 | struct sbp2_status *status) |
1364 | { |
1365 | struct sbp2_command_orb *orb = |
1366 | container_of(base_orb, struct sbp2_command_orb, base); |
1367 | struct fw_device *device = target_device(orb->lu->tgt); |
1368 | int result; |
1369 | |
1370 | if (status != NULL) { |
1371 | if (STATUS_GET_DEAD(*status)) |
1372 | sbp2_agent_reset_no_wait(orb->lu); |
1373 | |
1374 | switch (STATUS_GET_RESPONSE(*status)) { |
1375 | case SBP2_STATUS_REQUEST_COMPLETE: |
1376 | result = DID_OK << 16; |
1377 | break; |
1378 | case SBP2_STATUS_TRANSPORT_FAILURE: |
1379 | result = DID_BUS_BUSY << 16; |
1380 | break; |
1381 | case SBP2_STATUS_ILLEGAL_REQUEST: |
1382 | case SBP2_STATUS_VENDOR_DEPENDENT: |
1383 | default: |
1384 | result = DID_ERROR << 16; |
1385 | break; |
1386 | } |
1387 | |
1388 | if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1) |
1389 | result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status), |
1390 | orb->cmd->sense_buffer); |
1391 | } else { |
1392 | /* |
1393 | * If the orb completes with status == NULL, something |
1394 | * went wrong, typically a bus reset happened mid-orb |
1395 | * or when sending the write (less likely). |
1396 | */ |
1397 | result = DID_BUS_BUSY << 16; |
1398 | sbp2_conditionally_block(orb->lu); |
1399 | } |
1400 | |
1401 | dma_unmap_single(device->card->device, orb->base.request_bus, |
1402 | sizeof(orb->request), DMA_TO_DEVICE); |
1403 | sbp2_unmap_scatterlist(device->card->device, orb); |
1404 | |
1405 | orb->cmd->result = result; |
1406 | orb->done(orb->cmd); |
1407 | } |
1408 | |
1409 | static int sbp2_map_scatterlist(struct sbp2_command_orb *orb, |
1410 | struct fw_device *device, struct sbp2_logical_unit *lu) |
1411 | { |
1412 | struct scatterlist *sg = scsi_sglist(orb->cmd); |
1413 | int i, n; |
1414 | |
1415 | n = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd), |
1416 | orb->cmd->sc_data_direction); |
1417 | if (n == 0) |
1418 | goto fail; |
1419 | |
1420 | /* |
1421 | * Handle the special case where there is only one element in |
1422 | * the scatter list by converting it to an immediate block |
1423 | * request. This is also a workaround for broken devices such |
1424 | * as the second generation iPod which doesn't support page |
1425 | * tables. |
1426 | */ |
1427 | if (n == 1) { |
1428 | orb->request.data_descriptor.high = |
1429 | cpu_to_be32(lu->tgt->address_high); |
1430 | orb->request.data_descriptor.low = |
1431 | cpu_to_be32(sg_dma_address(sg)); |
1432 | orb->request.misc |= |
1433 | cpu_to_be32(COMMAND_ORB_DATA_SIZE(sg_dma_len(sg))); |
1434 | return 0; |
1435 | } |
1436 | |
1437 | for_each_sg(sg, sg, n, i) { |
1438 | orb->page_table[i].high = cpu_to_be32(sg_dma_len(sg) << 16); |
1439 | orb->page_table[i].low = cpu_to_be32(sg_dma_address(sg)); |
1440 | } |
1441 | |
1442 | orb->page_table_bus = |
1443 | dma_map_single(device->card->device, orb->page_table, |
1444 | sizeof(orb->page_table), DMA_TO_DEVICE); |
1445 | if (dma_mapping_error(device->card->device, orb->page_table_bus)) |
1446 | goto fail_page_table; |
1447 | |
1448 | /* |
1449 | * The data_descriptor pointer is the one case where we need |
1450 | * to fill in the node ID part of the address. All other |
1451 | * pointers assume that the data referenced reside on the |
1452 | * initiator (i.e. us), but data_descriptor can refer to data |
1453 | * on other nodes so we need to put our ID in descriptor.high. |
1454 | */ |
1455 | orb->request.data_descriptor.high = cpu_to_be32(lu->tgt->address_high); |
1456 | orb->request.data_descriptor.low = cpu_to_be32(orb->page_table_bus); |
1457 | orb->request.misc |= cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT | |
1458 | COMMAND_ORB_DATA_SIZE(n)); |
1459 | |
1460 | return 0; |
1461 | |
1462 | fail_page_table: |
1463 | dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd), |
1464 | scsi_sg_count(orb->cmd), orb->cmd->sc_data_direction); |
1465 | fail: |
1466 | return -ENOMEM; |
1467 | } |
1468 | |
1469 | /* SCSI stack integration */ |
1470 | |
1471 | static int sbp2_scsi_queuecommand_lck(struct scsi_cmnd *cmd, scsi_done_fn_t done) |
1472 | { |
1473 | struct sbp2_logical_unit *lu = cmd->device->hostdata; |
1474 | struct fw_device *device = target_device(lu->tgt); |
1475 | struct sbp2_command_orb *orb; |
1476 | int generation, retval = SCSI_MLQUEUE_HOST_BUSY; |
1477 | |
1478 | /* |
1479 | * Bidirectional commands are not yet implemented, and unknown |
1480 | * transfer direction not handled. |
1481 | */ |
1482 | if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) { |
1483 | fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n"); |
1484 | cmd->result = DID_ERROR << 16; |
1485 | done(cmd); |
1486 | return 0; |
1487 | } |
1488 | |
1489 | orb = kzalloc(sizeof(*orb), GFP_ATOMIC); |
1490 | if (orb == NULL) { |
1491 | fw_notify("failed to alloc orb\n"); |
1492 | return SCSI_MLQUEUE_HOST_BUSY; |
1493 | } |
1494 | |
1495 | /* Initialize rcode to something not RCODE_COMPLETE. */ |
1496 | orb->base.rcode = -1; |
1497 | kref_init(&orb->base.kref); |
1498 | |
1499 | orb->lu = lu; |
1500 | orb->done = done; |
1501 | orb->cmd = cmd; |
1502 | |
1503 | orb->request.next.high = cpu_to_be32(SBP2_ORB_NULL); |
1504 | orb->request.misc = cpu_to_be32( |
1505 | COMMAND_ORB_MAX_PAYLOAD(lu->tgt->max_payload) | |
1506 | COMMAND_ORB_SPEED(device->max_speed) | |
1507 | COMMAND_ORB_NOTIFY); |
1508 | |
1509 | if (cmd->sc_data_direction == DMA_FROM_DEVICE) |
1510 | orb->request.misc |= cpu_to_be32(COMMAND_ORB_DIRECTION); |
1511 | |
1512 | generation = device->generation; |
1513 | smp_rmb(); /* sbp2_map_scatterlist looks at tgt->address_high */ |
1514 | |
1515 | if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0) |
1516 | goto out; |
1517 | |
1518 | memcpy(orb->request.command_block, cmd->cmnd, cmd->cmd_len); |
1519 | |
1520 | orb->base.callback = complete_command_orb; |
1521 | orb->base.request_bus = |
1522 | dma_map_single(device->card->device, &orb->request, |
1523 | sizeof(orb->request), DMA_TO_DEVICE); |
1524 | if (dma_mapping_error(device->card->device, orb->base.request_bus)) { |
1525 | sbp2_unmap_scatterlist(device->card->device, orb); |
1526 | goto out; |
1527 | } |
1528 | |
1529 | sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, generation, |
1530 | lu->command_block_agent_address + SBP2_ORB_POINTER); |
1531 | retval = 0; |
1532 | out: |
1533 | kref_put(&orb->base.kref, free_orb); |
1534 | return retval; |
1535 | } |
1536 | |
1537 | static DEF_SCSI_QCMD(sbp2_scsi_queuecommand) |
1538 | |
1539 | static int sbp2_scsi_slave_alloc(struct scsi_device *sdev) |
1540 | { |
1541 | struct sbp2_logical_unit *lu = sdev->hostdata; |
1542 | |
1543 | /* (Re-)Adding logical units via the SCSI stack is not supported. */ |
1544 | if (!lu) |
1545 | return -ENOSYS; |
1546 | |
1547 | sdev->allow_restart = 1; |
1548 | |
1549 | /* SBP-2 requires quadlet alignment of the data buffers. */ |
1550 | blk_queue_update_dma_alignment(sdev->request_queue, 4 - 1); |
1551 | |
1552 | if (lu->tgt->workarounds & SBP2_WORKAROUND_INQUIRY_36) |
1553 | sdev->inquiry_len = 36; |
1554 | |
1555 | return 0; |
1556 | } |
1557 | |
1558 | static int sbp2_scsi_slave_configure(struct scsi_device *sdev) |
1559 | { |
1560 | struct sbp2_logical_unit *lu = sdev->hostdata; |
1561 | |
1562 | sdev->use_10_for_rw = 1; |
1563 | |
1564 | if (sbp2_param_exclusive_login) |
1565 | sdev->manage_start_stop = 1; |
1566 | |
1567 | if (sdev->type == TYPE_ROM) |
1568 | sdev->use_10_for_ms = 1; |
1569 | |
1570 | if (sdev->type == TYPE_DISK && |
1571 | lu->tgt->workarounds & SBP2_WORKAROUND_MODE_SENSE_8) |
1572 | sdev->skip_ms_page_8 = 1; |
1573 | |
1574 | if (lu->tgt->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) |
1575 | sdev->fix_capacity = 1; |
1576 | |
1577 | if (lu->tgt->workarounds & SBP2_WORKAROUND_POWER_CONDITION) |
1578 | sdev->start_stop_pwr_cond = 1; |
1579 | |
1580 | if (lu->tgt->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS) |
1581 | blk_queue_max_hw_sectors(sdev->request_queue, 128 * 1024 / 512); |
1582 | |
1583 | blk_queue_max_segment_size(sdev->request_queue, SBP2_MAX_SEG_SIZE); |
1584 | |
1585 | return 0; |
1586 | } |
1587 | |
1588 | /* |
1589 | * Called by scsi stack when something has really gone wrong. Usually |
1590 | * called when a command has timed-out for some reason. |
1591 | */ |
1592 | static int sbp2_scsi_abort(struct scsi_cmnd *cmd) |
1593 | { |
1594 | struct sbp2_logical_unit *lu = cmd->device->hostdata; |
1595 | |
1596 | fw_notify("%s: sbp2_scsi_abort\n", lu->tgt->bus_id); |
1597 | sbp2_agent_reset(lu); |
1598 | sbp2_cancel_orbs(lu); |
1599 | |
1600 | return SUCCESS; |
1601 | } |
1602 | |
1603 | /* |
1604 | * Format of /sys/bus/scsi/devices/.../ieee1394_id: |
1605 | * u64 EUI-64 : u24 directory_ID : u16 LUN (all printed in hexadecimal) |
1606 | * |
1607 | * This is the concatenation of target port identifier and logical unit |
1608 | * identifier as per SAM-2...SAM-4 annex A. |
1609 | */ |
1610 | static ssize_t sbp2_sysfs_ieee1394_id_show(struct device *dev, |
1611 | struct device_attribute *attr, char *buf) |
1612 | { |
1613 | struct scsi_device *sdev = to_scsi_device(dev); |
1614 | struct sbp2_logical_unit *lu; |
1615 | |
1616 | if (!sdev) |
1617 | return 0; |
1618 | |
1619 | lu = sdev->hostdata; |
1620 | |
1621 | return sprintf(buf, "%016llx:%06x:%04x\n", |
1622 | (unsigned long long)lu->tgt->guid, |
1623 | lu->tgt->directory_id, lu->lun); |
1624 | } |
1625 | |
1626 | static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL); |
1627 | |
1628 | static struct device_attribute *sbp2_scsi_sysfs_attrs[] = { |
1629 | &dev_attr_ieee1394_id, |
1630 | NULL |
1631 | }; |
1632 | |
1633 | static struct scsi_host_template scsi_driver_template = { |
1634 | .module = THIS_MODULE, |
1635 | .name = "SBP-2 IEEE-1394", |
1636 | .proc_name = sbp2_driver_name, |
1637 | .queuecommand = sbp2_scsi_queuecommand, |
1638 | .slave_alloc = sbp2_scsi_slave_alloc, |
1639 | .slave_configure = sbp2_scsi_slave_configure, |
1640 | .eh_abort_handler = sbp2_scsi_abort, |
1641 | .this_id = -1, |
1642 | .sg_tablesize = SG_ALL, |
1643 | .use_clustering = ENABLE_CLUSTERING, |
1644 | .cmd_per_lun = 1, |
1645 | .can_queue = 1, |
1646 | .sdev_attrs = sbp2_scsi_sysfs_attrs, |
1647 | }; |
1648 | |
1649 | MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>"); |
1650 | MODULE_DESCRIPTION("SCSI over IEEE1394"); |
1651 | MODULE_LICENSE("GPL"); |
1652 | MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table); |
1653 | |
1654 | /* Provide a module alias so root-on-sbp2 initrds don't break. */ |
1655 | #ifndef CONFIG_IEEE1394_SBP2_MODULE |
1656 | MODULE_ALIAS("sbp2"); |
1657 | #endif |
1658 | |
1659 | static int __init sbp2_init(void) |
1660 | { |
1661 | sbp2_wq = create_singlethread_workqueue(KBUILD_MODNAME); |
1662 | if (!sbp2_wq) |
1663 | return -ENOMEM; |
1664 | |
1665 | return driver_register(&sbp2_driver.driver); |
1666 | } |
1667 | |
1668 | static void __exit sbp2_cleanup(void) |
1669 | { |
1670 | driver_unregister(&sbp2_driver.driver); |
1671 | destroy_workqueue(sbp2_wq); |
1672 | } |
1673 | |
1674 | module_init(sbp2_init); |
1675 | module_exit(sbp2_cleanup); |
1676 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9