Commit | Line | Data |
---|---|---|
c781c06d KH |
1 | /* |
2 | * SBP2 driver (SCSI over IEEE1394) | |
9ba136d0 | 3 | * |
27a15e50 | 4 | * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net> |
9ba136d0 KH |
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 | ||
c781c06d KH |
21 | /* |
22 | * The basic structure of this driver is based on the old storage driver, | |
27a15e50 KH |
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 | ||
7bb6bf7c SR |
31 | #include <linux/blkdev.h> |
32 | #include <linux/delay.h> | |
33 | #include <linux/device.h> | |
34 | #include <linux/dma-mapping.h> | |
9ba136d0 | 35 | #include <linux/kernel.h> |
7bb6bf7c | 36 | #include <linux/mod_devicetable.h> |
9ba136d0 | 37 | #include <linux/module.h> |
5cd54c94 | 38 | #include <linux/moduleparam.h> |
0b5b2903 | 39 | #include <linux/scatterlist.h> |
e7cdf237 | 40 | #include <linux/string.h> |
2df222b8 | 41 | #include <linux/stringify.h> |
1d3d52c5 | 42 | #include <linux/timer.h> |
df8ec249 | 43 | #include <linux/workqueue.h> |
b5d2a5e0 | 44 | #include <asm/system.h> |
9ba136d0 KH |
45 | |
46 | #include <scsi/scsi.h> | |
47 | #include <scsi/scsi_cmnd.h> | |
9ba136d0 KH |
48 | #include <scsi/scsi_device.h> |
49 | #include <scsi/scsi_host.h> | |
50 | ||
9ba136d0 | 51 | #include "fw-device.h" |
7bb6bf7c SR |
52 | #include "fw-topology.h" |
53 | #include "fw-transaction.h" | |
9ba136d0 | 54 | |
5cd54c94 SR |
55 | /* |
56 | * So far only bridges from Oxford Semiconductor are known to support | |
57 | * concurrent logins. Depending on firmware, four or two concurrent logins | |
58 | * are possible on OXFW911 and newer Oxsemi bridges. | |
59 | * | |
60 | * Concurrent logins are useful together with cluster filesystems. | |
61 | */ | |
62 | static int sbp2_param_exclusive_login = 1; | |
63 | module_param_named(exclusive_login, sbp2_param_exclusive_login, bool, 0644); | |
64 | MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device " | |
65 | "(default = Y, use N for concurrent initiators)"); | |
66 | ||
2df222b8 SR |
67 | /* |
68 | * Flags for firmware oddities | |
69 | * | |
70 | * - 128kB max transfer | |
71 | * Limit transfer size. Necessary for some old bridges. | |
72 | * | |
73 | * - 36 byte inquiry | |
74 | * When scsi_mod probes the device, let the inquiry command look like that | |
75 | * from MS Windows. | |
76 | * | |
77 | * - skip mode page 8 | |
78 | * Suppress sending of mode_sense for mode page 8 if the device pretends to | |
79 | * support the SCSI Primary Block commands instead of Reduced Block Commands. | |
80 | * | |
81 | * - fix capacity | |
82 | * Tell sd_mod to correct the last sector number reported by read_capacity. | |
83 | * Avoids access beyond actual disk limits on devices with an off-by-one bug. | |
84 | * Don't use this with devices which don't have this bug. | |
85 | * | |
9220f194 SR |
86 | * - delay inquiry |
87 | * Wait extra SBP2_INQUIRY_DELAY seconds after login before SCSI inquiry. | |
88 | * | |
2df222b8 SR |
89 | * - override internal blacklist |
90 | * Instead of adding to the built-in blacklist, use only the workarounds | |
91 | * specified in the module load parameter. | |
92 | * Useful if a blacklist entry interfered with a non-broken device. | |
93 | */ | |
94 | #define SBP2_WORKAROUND_128K_MAX_TRANS 0x1 | |
95 | #define SBP2_WORKAROUND_INQUIRY_36 0x2 | |
96 | #define SBP2_WORKAROUND_MODE_SENSE_8 0x4 | |
97 | #define SBP2_WORKAROUND_FIX_CAPACITY 0x8 | |
9220f194 SR |
98 | #define SBP2_WORKAROUND_DELAY_INQUIRY 0x10 |
99 | #define SBP2_INQUIRY_DELAY 12 | |
2df222b8 SR |
100 | #define SBP2_WORKAROUND_OVERRIDE 0x100 |
101 | ||
102 | static int sbp2_param_workarounds; | |
103 | module_param_named(workarounds, sbp2_param_workarounds, int, 0644); | |
104 | MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0" | |
105 | ", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS) | |
106 | ", 36 byte inquiry = " __stringify(SBP2_WORKAROUND_INQUIRY_36) | |
107 | ", skip mode page 8 = " __stringify(SBP2_WORKAROUND_MODE_SENSE_8) | |
108 | ", fix capacity = " __stringify(SBP2_WORKAROUND_FIX_CAPACITY) | |
9220f194 | 109 | ", delay inquiry = " __stringify(SBP2_WORKAROUND_DELAY_INQUIRY) |
2df222b8 SR |
110 | ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE) |
111 | ", or a combination)"); | |
112 | ||
9ba136d0 | 113 | /* I don't know why the SCSI stack doesn't define something like this... */ |
a98e2719 | 114 | typedef void (*scsi_done_fn_t)(struct scsi_cmnd *); |
9ba136d0 KH |
115 | |
116 | static const char sbp2_driver_name[] = "sbp2"; | |
117 | ||
5a3c2be6 SR |
118 | /* |
119 | * We create one struct sbp2_logical_unit per SBP-2 Logical Unit Number Entry | |
120 | * and one struct scsi_device per sbp2_logical_unit. | |
121 | */ | |
122 | struct sbp2_logical_unit { | |
123 | struct sbp2_target *tgt; | |
124 | struct list_head link; | |
9ba136d0 KH |
125 | struct fw_address_handler address_handler; |
126 | struct list_head orb_list; | |
5a3c2be6 | 127 | |
9ba136d0 | 128 | u64 command_block_agent_address; |
5a3c2be6 | 129 | u16 lun; |
9ba136d0 KH |
130 | int login_id; |
131 | ||
c781c06d | 132 | /* |
5a3c2be6 SR |
133 | * The generation is updated once we've logged in or reconnected |
134 | * to the logical unit. Thus, I/O to the device will automatically | |
135 | * fail and get retried if it happens in a window where the device | |
136 | * is not ready, e.g. after a bus reset but before we reconnect. | |
c781c06d | 137 | */ |
9ba136d0 | 138 | int generation; |
7f37c426 KH |
139 | int retries; |
140 | struct delayed_work work; | |
f8436158 | 141 | bool has_sdev; |
2e2705bd | 142 | bool blocked; |
9ba136d0 KH |
143 | }; |
144 | ||
5a3c2be6 SR |
145 | /* |
146 | * We create one struct sbp2_target per IEEE 1212 Unit Directory | |
147 | * and one struct Scsi_Host per sbp2_target. | |
148 | */ | |
149 | struct sbp2_target { | |
150 | struct kref kref; | |
151 | struct fw_unit *unit; | |
48f18c76 | 152 | const char *bus_id; |
05cca738 | 153 | struct list_head lu_list; |
5a3c2be6 SR |
154 | |
155 | u64 management_agent_address; | |
156 | int directory_id; | |
157 | int node_id; | |
158 | int address_high; | |
05cca738 | 159 | unsigned int workarounds; |
384170da | 160 | unsigned int mgt_orb_timeout; |
2e2705bd SR |
161 | |
162 | int dont_block; /* counter for each logical unit */ | |
163 | int blocked; /* ditto */ | |
5a3c2be6 SR |
164 | }; |
165 | ||
a4c379c1 JW |
166 | /* |
167 | * Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be | |
384170da JW |
168 | * provided in the config rom. Most devices do provide a value, which |
169 | * we'll use for login management orbs, but with some sane limits. | |
a4c379c1 | 170 | */ |
384170da JW |
171 | #define SBP2_MIN_LOGIN_ORB_TIMEOUT 5000U /* Timeout in ms */ |
172 | #define SBP2_MAX_LOGIN_ORB_TIMEOUT 40000U /* Timeout in ms */ | |
05cca738 | 173 | #define SBP2_ORB_TIMEOUT 2000U /* Timeout in ms */ |
9ba136d0 | 174 | #define SBP2_ORB_NULL 0x80000000 |
a4c379c1 | 175 | #define SBP2_MAX_SG_ELEMENT_LENGTH 0xf000 |
17cff9ff JW |
176 | #define SBP2_RETRY_LIMIT 0xf /* 15 retries */ |
177 | #define SBP2_CYCLE_LIMIT (0xc8 << 12) /* 200 125us cycles */ | |
9ba136d0 | 178 | |
9ba136d0 | 179 | /* Unit directory keys */ |
384170da | 180 | #define SBP2_CSR_UNIT_CHARACTERISTICS 0x3a |
5a3c2be6 SR |
181 | #define SBP2_CSR_FIRMWARE_REVISION 0x3c |
182 | #define SBP2_CSR_LOGICAL_UNIT_NUMBER 0x14 | |
183 | #define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4 | |
9ba136d0 | 184 | |
9ba136d0 KH |
185 | /* Management orb opcodes */ |
186 | #define SBP2_LOGIN_REQUEST 0x0 | |
187 | #define SBP2_QUERY_LOGINS_REQUEST 0x1 | |
188 | #define SBP2_RECONNECT_REQUEST 0x3 | |
189 | #define SBP2_SET_PASSWORD_REQUEST 0x4 | |
190 | #define SBP2_LOGOUT_REQUEST 0x7 | |
191 | #define SBP2_ABORT_TASK_REQUEST 0xb | |
192 | #define SBP2_ABORT_TASK_SET 0xc | |
193 | #define SBP2_LOGICAL_UNIT_RESET 0xe | |
194 | #define SBP2_TARGET_RESET_REQUEST 0xf | |
195 | ||
196 | /* Offsets for command block agent registers */ | |
197 | #define SBP2_AGENT_STATE 0x00 | |
198 | #define SBP2_AGENT_RESET 0x04 | |
199 | #define SBP2_ORB_POINTER 0x08 | |
200 | #define SBP2_DOORBELL 0x10 | |
201 | #define SBP2_UNSOLICITED_STATUS_ENABLE 0x14 | |
202 | ||
203 | /* Status write response codes */ | |
204 | #define SBP2_STATUS_REQUEST_COMPLETE 0x0 | |
205 | #define SBP2_STATUS_TRANSPORT_FAILURE 0x1 | |
206 | #define SBP2_STATUS_ILLEGAL_REQUEST 0x2 | |
207 | #define SBP2_STATUS_VENDOR_DEPENDENT 0x3 | |
208 | ||
a77754a7 KH |
209 | #define STATUS_GET_ORB_HIGH(v) ((v).status & 0xffff) |
210 | #define STATUS_GET_SBP_STATUS(v) (((v).status >> 16) & 0xff) | |
211 | #define STATUS_GET_LEN(v) (((v).status >> 24) & 0x07) | |
212 | #define STATUS_GET_DEAD(v) (((v).status >> 27) & 0x01) | |
213 | #define STATUS_GET_RESPONSE(v) (((v).status >> 28) & 0x03) | |
214 | #define STATUS_GET_SOURCE(v) (((v).status >> 30) & 0x03) | |
215 | #define STATUS_GET_ORB_LOW(v) ((v).orb_low) | |
216 | #define STATUS_GET_DATA(v) ((v).data) | |
9ba136d0 KH |
217 | |
218 | struct sbp2_status { | |
219 | u32 status; | |
220 | u32 orb_low; | |
221 | u8 data[24]; | |
222 | }; | |
223 | ||
224 | struct sbp2_pointer { | |
71ee9f01 SR |
225 | __be32 high; |
226 | __be32 low; | |
9ba136d0 KH |
227 | }; |
228 | ||
229 | struct sbp2_orb { | |
230 | struct fw_transaction t; | |
e57d2011 | 231 | struct kref kref; |
9ba136d0 KH |
232 | dma_addr_t request_bus; |
233 | int rcode; | |
234 | struct sbp2_pointer pointer; | |
a98e2719 | 235 | void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status); |
9ba136d0 KH |
236 | struct list_head link; |
237 | }; | |
238 | ||
a77754a7 KH |
239 | #define MANAGEMENT_ORB_LUN(v) ((v)) |
240 | #define MANAGEMENT_ORB_FUNCTION(v) ((v) << 16) | |
241 | #define MANAGEMENT_ORB_RECONNECT(v) ((v) << 20) | |
5cd54c94 | 242 | #define MANAGEMENT_ORB_EXCLUSIVE(v) ((v) ? 1 << 28 : 0) |
a77754a7 KH |
243 | #define MANAGEMENT_ORB_REQUEST_FORMAT(v) ((v) << 29) |
244 | #define MANAGEMENT_ORB_NOTIFY ((1) << 31) | |
9ba136d0 | 245 | |
a77754a7 KH |
246 | #define MANAGEMENT_ORB_RESPONSE_LENGTH(v) ((v)) |
247 | #define MANAGEMENT_ORB_PASSWORD_LENGTH(v) ((v) << 16) | |
9ba136d0 KH |
248 | |
249 | struct sbp2_management_orb { | |
250 | struct sbp2_orb base; | |
251 | struct { | |
252 | struct sbp2_pointer password; | |
253 | struct sbp2_pointer response; | |
71ee9f01 SR |
254 | __be32 misc; |
255 | __be32 length; | |
9ba136d0 KH |
256 | struct sbp2_pointer status_fifo; |
257 | } request; | |
258 | __be32 response[4]; | |
259 | dma_addr_t response_bus; | |
260 | struct completion done; | |
261 | struct sbp2_status status; | |
262 | }; | |
263 | ||
9ba136d0 | 264 | struct sbp2_login_response { |
71ee9f01 | 265 | __be32 misc; |
9ba136d0 | 266 | struct sbp2_pointer command_block_agent; |
71ee9f01 | 267 | __be32 reconnect_hold; |
9ba136d0 | 268 | }; |
a77754a7 KH |
269 | #define COMMAND_ORB_DATA_SIZE(v) ((v)) |
270 | #define COMMAND_ORB_PAGE_SIZE(v) ((v) << 16) | |
271 | #define COMMAND_ORB_PAGE_TABLE_PRESENT ((1) << 19) | |
272 | #define COMMAND_ORB_MAX_PAYLOAD(v) ((v) << 20) | |
273 | #define COMMAND_ORB_SPEED(v) ((v) << 24) | |
0d7dcbf2 | 274 | #define COMMAND_ORB_DIRECTION ((1) << 27) |
a77754a7 KH |
275 | #define COMMAND_ORB_REQUEST_FORMAT(v) ((v) << 29) |
276 | #define COMMAND_ORB_NOTIFY ((1) << 31) | |
9ba136d0 KH |
277 | |
278 | struct sbp2_command_orb { | |
279 | struct sbp2_orb base; | |
280 | struct { | |
281 | struct sbp2_pointer next; | |
282 | struct sbp2_pointer data_descriptor; | |
71ee9f01 | 283 | __be32 misc; |
9ba136d0 KH |
284 | u8 command_block[12]; |
285 | } request; | |
286 | struct scsi_cmnd *cmd; | |
287 | scsi_done_fn_t done; | |
5a3c2be6 | 288 | struct sbp2_logical_unit *lu; |
9ba136d0 | 289 | |
9fb2dd12 | 290 | struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8))); |
9ba136d0 | 291 | dma_addr_t page_table_bus; |
9ba136d0 KH |
292 | }; |
293 | ||
294 | /* | |
295 | * List of devices with known bugs. | |
296 | * | |
297 | * The firmware_revision field, masked with 0xffff00, is the best | |
298 | * indicator for the type of bridge chip of a device. It yields a few | |
299 | * false positives but this did not break correctly behaving devices | |
300 | * so far. We use ~0 as a wildcard, since the 24 bit values we get | |
301 | * from the config rom can never match that. | |
302 | */ | |
303 | static const struct { | |
304 | u32 firmware_revision; | |
305 | u32 model; | |
05cca738 | 306 | unsigned int workarounds; |
9ba136d0 KH |
307 | } sbp2_workarounds_table[] = { |
308 | /* DViCO Momobay CX-1 with TSB42AA9 bridge */ { | |
309 | .firmware_revision = 0x002800, | |
310 | .model = 0x001010, | |
311 | .workarounds = SBP2_WORKAROUND_INQUIRY_36 | | |
312 | SBP2_WORKAROUND_MODE_SENSE_8, | |
313 | }, | |
9220f194 SR |
314 | /* DViCO Momobay FX-3A with TSB42AA9A bridge */ { |
315 | .firmware_revision = 0x002800, | |
316 | .model = 0x000000, | |
317 | .workarounds = SBP2_WORKAROUND_DELAY_INQUIRY, | |
318 | }, | |
9ba136d0 KH |
319 | /* Initio bridges, actually only needed for some older ones */ { |
320 | .firmware_revision = 0x000200, | |
321 | .model = ~0, | |
322 | .workarounds = SBP2_WORKAROUND_INQUIRY_36, | |
323 | }, | |
324 | /* Symbios bridge */ { | |
325 | .firmware_revision = 0xa0b800, | |
326 | .model = ~0, | |
327 | .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, | |
328 | }, | |
2aa9ff7f SR |
329 | /* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ { |
330 | .firmware_revision = 0x002600, | |
331 | .model = ~0, | |
332 | .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, | |
333 | }, | |
c781c06d KH |
334 | |
335 | /* | |
336 | * There are iPods (2nd gen, 3rd gen) with model_id == 0, but | |
9ba136d0 KH |
337 | * these iPods do not feature the read_capacity bug according |
338 | * to one report. Read_capacity behaviour as well as model_id | |
c781c06d KH |
339 | * could change due to Apple-supplied firmware updates though. |
340 | */ | |
341 | ||
9ba136d0 KH |
342 | /* iPod 4th generation. */ { |
343 | .firmware_revision = 0x0a2700, | |
344 | .model = 0x000021, | |
345 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, | |
346 | }, | |
347 | /* iPod mini */ { | |
348 | .firmware_revision = 0x0a2700, | |
349 | .model = 0x000023, | |
350 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, | |
351 | }, | |
352 | /* iPod Photo */ { | |
353 | .firmware_revision = 0x0a2700, | |
354 | .model = 0x00007e, | |
355 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, | |
356 | } | |
357 | }; | |
358 | ||
e57d2011 KH |
359 | static void |
360 | free_orb(struct kref *kref) | |
361 | { | |
362 | struct sbp2_orb *orb = container_of(kref, struct sbp2_orb, kref); | |
363 | ||
364 | kfree(orb); | |
365 | } | |
366 | ||
9ba136d0 KH |
367 | static void |
368 | sbp2_status_write(struct fw_card *card, struct fw_request *request, | |
369 | int tcode, int destination, int source, | |
370 | int generation, int speed, | |
371 | unsigned long long offset, | |
372 | void *payload, size_t length, void *callback_data) | |
373 | { | |
5a3c2be6 | 374 | struct sbp2_logical_unit *lu = callback_data; |
9ba136d0 KH |
375 | struct sbp2_orb *orb; |
376 | struct sbp2_status status; | |
377 | size_t header_size; | |
378 | unsigned long flags; | |
379 | ||
380 | if (tcode != TCODE_WRITE_BLOCK_REQUEST || | |
2d826cc5 | 381 | length == 0 || length > sizeof(status)) { |
9ba136d0 KH |
382 | fw_send_response(card, request, RCODE_TYPE_ERROR); |
383 | return; | |
384 | } | |
385 | ||
386 | header_size = min(length, 2 * sizeof(u32)); | |
387 | fw_memcpy_from_be32(&status, payload, header_size); | |
388 | if (length > header_size) | |
389 | memcpy(status.data, payload + 8, length - header_size); | |
a77754a7 | 390 | if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) { |
9ba136d0 KH |
391 | fw_notify("non-orb related status write, not handled\n"); |
392 | fw_send_response(card, request, RCODE_COMPLETE); | |
393 | return; | |
394 | } | |
395 | ||
396 | /* Lookup the orb corresponding to this status write. */ | |
397 | spin_lock_irqsave(&card->lock, flags); | |
5a3c2be6 | 398 | list_for_each_entry(orb, &lu->orb_list, link) { |
a77754a7 | 399 | if (STATUS_GET_ORB_HIGH(status) == 0 && |
e57d2011 KH |
400 | STATUS_GET_ORB_LOW(status) == orb->request_bus) { |
401 | orb->rcode = RCODE_COMPLETE; | |
9ba136d0 KH |
402 | list_del(&orb->link); |
403 | break; | |
404 | } | |
405 | } | |
406 | spin_unlock_irqrestore(&card->lock, flags); | |
407 | ||
5a3c2be6 | 408 | if (&orb->link != &lu->orb_list) |
9ba136d0 KH |
409 | orb->callback(orb, &status); |
410 | else | |
411 | fw_error("status write for unknown orb\n"); | |
412 | ||
e57d2011 KH |
413 | kref_put(&orb->kref, free_orb); |
414 | ||
9ba136d0 KH |
415 | fw_send_response(card, request, RCODE_COMPLETE); |
416 | } | |
417 | ||
418 | static void | |
419 | complete_transaction(struct fw_card *card, int rcode, | |
420 | void *payload, size_t length, void *data) | |
421 | { | |
422 | struct sbp2_orb *orb = data; | |
423 | unsigned long flags; | |
424 | ||
e57d2011 KH |
425 | /* |
426 | * This is a little tricky. We can get the status write for | |
427 | * the orb before we get this callback. The status write | |
428 | * handler above will assume the orb pointer transaction was | |
429 | * successful and set the rcode to RCODE_COMPLETE for the orb. | |
430 | * So this callback only sets the rcode if it hasn't already | |
431 | * been set and only does the cleanup if the transaction | |
432 | * failed and we didn't already get a status write. | |
433 | */ | |
434 | spin_lock_irqsave(&card->lock, flags); | |
435 | ||
436 | if (orb->rcode == -1) | |
437 | orb->rcode = rcode; | |
438 | if (orb->rcode != RCODE_COMPLETE) { | |
9ba136d0 | 439 | list_del(&orb->link); |
1b34e974 | 440 | spin_unlock_irqrestore(&card->lock, flags); |
9ba136d0 | 441 | orb->callback(orb, NULL); |
1b34e974 SR |
442 | } else { |
443 | spin_unlock_irqrestore(&card->lock, flags); | |
9ba136d0 | 444 | } |
e57d2011 | 445 | |
e57d2011 | 446 | kref_put(&orb->kref, free_orb); |
9ba136d0 KH |
447 | } |
448 | ||
449 | static void | |
5a3c2be6 | 450 | sbp2_send_orb(struct sbp2_orb *orb, struct sbp2_logical_unit *lu, |
9ba136d0 KH |
451 | int node_id, int generation, u64 offset) |
452 | { | |
5a3c2be6 | 453 | struct fw_device *device = fw_device(lu->tgt->unit->device.parent); |
9ba136d0 KH |
454 | unsigned long flags; |
455 | ||
456 | orb->pointer.high = 0; | |
71ee9f01 | 457 | orb->pointer.low = cpu_to_be32(orb->request_bus); |
9ba136d0 KH |
458 | |
459 | spin_lock_irqsave(&device->card->lock, flags); | |
5a3c2be6 | 460 | list_add_tail(&orb->link, &lu->orb_list); |
9ba136d0 KH |
461 | spin_unlock_irqrestore(&device->card->lock, flags); |
462 | ||
e57d2011 KH |
463 | /* Take a ref for the orb list and for the transaction callback. */ |
464 | kref_get(&orb->kref); | |
465 | kref_get(&orb->kref); | |
466 | ||
9ba136d0 | 467 | fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST, |
f1397490 | 468 | node_id, generation, device->max_speed, offset, |
2d826cc5 | 469 | &orb->pointer, sizeof(orb->pointer), |
9ba136d0 KH |
470 | complete_transaction, orb); |
471 | } | |
472 | ||
5a3c2be6 | 473 | static int sbp2_cancel_orbs(struct sbp2_logical_unit *lu) |
9ba136d0 | 474 | { |
5a3c2be6 | 475 | struct fw_device *device = fw_device(lu->tgt->unit->device.parent); |
9ba136d0 KH |
476 | struct sbp2_orb *orb, *next; |
477 | struct list_head list; | |
478 | unsigned long flags; | |
2aaad97b | 479 | int retval = -ENOENT; |
9ba136d0 KH |
480 | |
481 | INIT_LIST_HEAD(&list); | |
482 | spin_lock_irqsave(&device->card->lock, flags); | |
5a3c2be6 | 483 | list_splice_init(&lu->orb_list, &list); |
9ba136d0 KH |
484 | spin_unlock_irqrestore(&device->card->lock, flags); |
485 | ||
486 | list_for_each_entry_safe(orb, next, &list, link) { | |
2aaad97b | 487 | retval = 0; |
730c32f5 KH |
488 | if (fw_cancel_transaction(device->card, &orb->t) == 0) |
489 | continue; | |
490 | ||
9ba136d0 KH |
491 | orb->rcode = RCODE_CANCELLED; |
492 | orb->callback(orb, NULL); | |
493 | } | |
9ba136d0 | 494 | |
2aaad97b | 495 | return retval; |
1d3d52c5 KH |
496 | } |
497 | ||
9ba136d0 KH |
498 | static void |
499 | complete_management_orb(struct sbp2_orb *base_orb, struct sbp2_status *status) | |
500 | { | |
501 | struct sbp2_management_orb *orb = | |
6f061487 | 502 | container_of(base_orb, struct sbp2_management_orb, base); |
9ba136d0 KH |
503 | |
504 | if (status) | |
2d826cc5 | 505 | memcpy(&orb->status, status, sizeof(*status)); |
9ba136d0 KH |
506 | complete(&orb->done); |
507 | } | |
508 | ||
509 | static int | |
5a3c2be6 SR |
510 | sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id, |
511 | int generation, int function, int lun_or_login_id, | |
512 | void *response) | |
9ba136d0 | 513 | { |
5a3c2be6 | 514 | struct fw_device *device = fw_device(lu->tgt->unit->device.parent); |
9ba136d0 | 515 | struct sbp2_management_orb *orb; |
a4c379c1 | 516 | unsigned int timeout; |
9ba136d0 KH |
517 | int retval = -ENOMEM; |
518 | ||
be6f48b0 SR |
519 | if (function == SBP2_LOGOUT_REQUEST && fw_device_is_shutdown(device)) |
520 | return 0; | |
521 | ||
2d826cc5 | 522 | orb = kzalloc(sizeof(*orb), GFP_ATOMIC); |
9ba136d0 KH |
523 | if (orb == NULL) |
524 | return -ENOMEM; | |
525 | ||
e57d2011 | 526 | kref_init(&orb->base.kref); |
9ba136d0 KH |
527 | orb->response_bus = |
528 | dma_map_single(device->card->device, &orb->response, | |
2d826cc5 | 529 | sizeof(orb->response), DMA_FROM_DEVICE); |
82eff9db | 530 | if (dma_mapping_error(orb->response_bus)) |
7aa48481 | 531 | goto fail_mapping_response; |
9ba136d0 | 532 | |
71ee9f01 SR |
533 | orb->request.response.high = 0; |
534 | orb->request.response.low = cpu_to_be32(orb->response_bus); | |
9ba136d0 | 535 | |
71ee9f01 | 536 | orb->request.misc = cpu_to_be32( |
a77754a7 KH |
537 | MANAGEMENT_ORB_NOTIFY | |
538 | MANAGEMENT_ORB_FUNCTION(function) | | |
71ee9f01 SR |
539 | MANAGEMENT_ORB_LUN(lun_or_login_id)); |
540 | orb->request.length = cpu_to_be32( | |
541 | MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response))); | |
9ba136d0 | 542 | |
71ee9f01 SR |
543 | orb->request.status_fifo.high = |
544 | cpu_to_be32(lu->address_handler.offset >> 32); | |
545 | orb->request.status_fifo.low = | |
546 | cpu_to_be32(lu->address_handler.offset); | |
9ba136d0 | 547 | |
9ba136d0 | 548 | if (function == SBP2_LOGIN_REQUEST) { |
14dc992a | 549 | /* Ask for 2^2 == 4 seconds reconnect grace period */ |
71ee9f01 | 550 | orb->request.misc |= cpu_to_be32( |
14dc992a | 551 | MANAGEMENT_ORB_RECONNECT(2) | |
71ee9f01 | 552 | MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login)); |
384170da | 553 | timeout = lu->tgt->mgt_orb_timeout; |
a4c379c1 JW |
554 | } else { |
555 | timeout = SBP2_ORB_TIMEOUT; | |
9ba136d0 KH |
556 | } |
557 | ||
9ba136d0 KH |
558 | init_completion(&orb->done); |
559 | orb->base.callback = complete_management_orb; | |
2aaad97b | 560 | |
7aa48481 SR |
561 | orb->base.request_bus = |
562 | dma_map_single(device->card->device, &orb->request, | |
563 | sizeof(orb->request), DMA_TO_DEVICE); | |
564 | if (dma_mapping_error(orb->base.request_bus)) | |
565 | goto fail_mapping_request; | |
566 | ||
5a3c2be6 SR |
567 | sbp2_send_orb(&orb->base, lu, node_id, generation, |
568 | lu->tgt->management_agent_address); | |
9ba136d0 | 569 | |
a4c379c1 | 570 | wait_for_completion_timeout(&orb->done, msecs_to_jiffies(timeout)); |
9ba136d0 | 571 | |
9ba136d0 | 572 | retval = -EIO; |
5a3c2be6 | 573 | if (sbp2_cancel_orbs(lu) == 0) { |
48f18c76 SR |
574 | fw_error("%s: orb reply timed out, rcode=0x%02x\n", |
575 | lu->tgt->bus_id, orb->base.rcode); | |
9ba136d0 KH |
576 | goto out; |
577 | } | |
578 | ||
2aaad97b | 579 | if (orb->base.rcode != RCODE_COMPLETE) { |
48f18c76 SR |
580 | fw_error("%s: management write failed, rcode 0x%02x\n", |
581 | lu->tgt->bus_id, orb->base.rcode); | |
9ba136d0 KH |
582 | goto out; |
583 | } | |
584 | ||
a77754a7 KH |
585 | if (STATUS_GET_RESPONSE(orb->status) != 0 || |
586 | STATUS_GET_SBP_STATUS(orb->status) != 0) { | |
48f18c76 | 587 | fw_error("%s: error status: %d:%d\n", lu->tgt->bus_id, |
a77754a7 KH |
588 | STATUS_GET_RESPONSE(orb->status), |
589 | STATUS_GET_SBP_STATUS(orb->status)); | |
9ba136d0 KH |
590 | goto out; |
591 | } | |
592 | ||
593 | retval = 0; | |
594 | out: | |
595 | dma_unmap_single(device->card->device, orb->base.request_bus, | |
2d826cc5 | 596 | sizeof(orb->request), DMA_TO_DEVICE); |
7aa48481 | 597 | fail_mapping_request: |
9ba136d0 | 598 | dma_unmap_single(device->card->device, orb->response_bus, |
2d826cc5 | 599 | sizeof(orb->response), DMA_FROM_DEVICE); |
7aa48481 | 600 | fail_mapping_response: |
9ba136d0 | 601 | if (response) |
71ee9f01 | 602 | memcpy(response, orb->response, sizeof(orb->response)); |
e57d2011 | 603 | kref_put(&orb->base.kref, free_orb); |
9ba136d0 KH |
604 | |
605 | return retval; | |
606 | } | |
607 | ||
608 | static void | |
609 | complete_agent_reset_write(struct fw_card *card, int rcode, | |
e0e60215 | 610 | void *payload, size_t length, void *done) |
9ba136d0 | 611 | { |
e0e60215 SR |
612 | complete(done); |
613 | } | |
614 | ||
615 | static void sbp2_agent_reset(struct sbp2_logical_unit *lu) | |
616 | { | |
617 | struct fw_device *device = fw_device(lu->tgt->unit->device.parent); | |
618 | DECLARE_COMPLETION_ONSTACK(done); | |
619 | struct fw_transaction t; | |
620 | static u32 z; | |
9ba136d0 | 621 | |
e0e60215 SR |
622 | fw_send_request(device->card, &t, TCODE_WRITE_QUADLET_REQUEST, |
623 | lu->tgt->node_id, lu->generation, device->max_speed, | |
624 | lu->command_block_agent_address + SBP2_AGENT_RESET, | |
625 | &z, sizeof(z), complete_agent_reset_write, &done); | |
626 | wait_for_completion(&done); | |
9ba136d0 KH |
627 | } |
628 | ||
e0e60215 SR |
629 | static void |
630 | complete_agent_reset_write_no_wait(struct fw_card *card, int rcode, | |
631 | void *payload, size_t length, void *data) | |
632 | { | |
633 | kfree(data); | |
634 | } | |
635 | ||
636 | static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu) | |
9ba136d0 | 637 | { |
5a3c2be6 | 638 | struct fw_device *device = fw_device(lu->tgt->unit->device.parent); |
9ba136d0 | 639 | struct fw_transaction *t; |
e0e60215 | 640 | static u32 z; |
9ba136d0 | 641 | |
e0e60215 | 642 | t = kmalloc(sizeof(*t), GFP_ATOMIC); |
9ba136d0 | 643 | if (t == NULL) |
e0e60215 | 644 | return; |
9ba136d0 KH |
645 | |
646 | fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST, | |
5a3c2be6 SR |
647 | lu->tgt->node_id, lu->generation, device->max_speed, |
648 | lu->command_block_agent_address + SBP2_AGENT_RESET, | |
e0e60215 | 649 | &z, sizeof(z), complete_agent_reset_write_no_wait, t); |
9ba136d0 KH |
650 | } |
651 | ||
2e2705bd SR |
652 | static void sbp2_set_generation(struct sbp2_logical_unit *lu, int generation) |
653 | { | |
654 | struct fw_card *card = fw_device(lu->tgt->unit->device.parent)->card; | |
655 | unsigned long flags; | |
656 | ||
657 | /* serialize with comparisons of lu->generation and card->generation */ | |
658 | spin_lock_irqsave(&card->lock, flags); | |
659 | lu->generation = generation; | |
660 | spin_unlock_irqrestore(&card->lock, flags); | |
661 | } | |
662 | ||
663 | static inline void sbp2_allow_block(struct sbp2_logical_unit *lu) | |
664 | { | |
665 | /* | |
666 | * We may access dont_block without taking card->lock here: | |
667 | * All callers of sbp2_allow_block() and all callers of sbp2_unblock() | |
668 | * are currently serialized against each other. | |
669 | * And a wrong result in sbp2_conditionally_block()'s access of | |
670 | * dont_block is rather harmless, it simply misses its first chance. | |
671 | */ | |
672 | --lu->tgt->dont_block; | |
673 | } | |
674 | ||
675 | /* | |
676 | * Blocks lu->tgt if all of the following conditions are met: | |
677 | * - Login, INQUIRY, and high-level SCSI setup of all of the target's | |
678 | * logical units have been finished (indicated by dont_block == 0). | |
679 | * - lu->generation is stale. | |
680 | * | |
681 | * Note, scsi_block_requests() must be called while holding card->lock, | |
682 | * otherwise it might foil sbp2_[conditionally_]unblock()'s attempt to | |
683 | * unblock the target. | |
684 | */ | |
685 | static void sbp2_conditionally_block(struct sbp2_logical_unit *lu) | |
686 | { | |
687 | struct sbp2_target *tgt = lu->tgt; | |
688 | struct fw_card *card = fw_device(tgt->unit->device.parent)->card; | |
689 | struct Scsi_Host *shost = | |
690 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); | |
691 | unsigned long flags; | |
692 | ||
693 | spin_lock_irqsave(&card->lock, flags); | |
694 | if (!tgt->dont_block && !lu->blocked && | |
695 | lu->generation != card->generation) { | |
696 | lu->blocked = true; | |
a5fd9ec7 | 697 | if (++tgt->blocked == 1) |
2e2705bd | 698 | scsi_block_requests(shost); |
2e2705bd SR |
699 | } |
700 | spin_unlock_irqrestore(&card->lock, flags); | |
701 | } | |
702 | ||
703 | /* | |
704 | * Unblocks lu->tgt as soon as all its logical units can be unblocked. | |
705 | * Note, it is harmless to run scsi_unblock_requests() outside the | |
706 | * card->lock protected section. On the other hand, running it inside | |
707 | * the section might clash with shost->host_lock. | |
708 | */ | |
709 | static void sbp2_conditionally_unblock(struct sbp2_logical_unit *lu) | |
710 | { | |
711 | struct sbp2_target *tgt = lu->tgt; | |
712 | struct fw_card *card = fw_device(tgt->unit->device.parent)->card; | |
713 | struct Scsi_Host *shost = | |
714 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); | |
715 | unsigned long flags; | |
716 | bool unblock = false; | |
717 | ||
718 | spin_lock_irqsave(&card->lock, flags); | |
719 | if (lu->blocked && lu->generation == card->generation) { | |
720 | lu->blocked = false; | |
721 | unblock = --tgt->blocked == 0; | |
722 | } | |
723 | spin_unlock_irqrestore(&card->lock, flags); | |
724 | ||
a5fd9ec7 | 725 | if (unblock) |
2e2705bd | 726 | scsi_unblock_requests(shost); |
2e2705bd SR |
727 | } |
728 | ||
729 | /* | |
730 | * Prevents future blocking of tgt and unblocks it. | |
731 | * Note, it is harmless to run scsi_unblock_requests() outside the | |
732 | * card->lock protected section. On the other hand, running it inside | |
733 | * the section might clash with shost->host_lock. | |
734 | */ | |
735 | static void sbp2_unblock(struct sbp2_target *tgt) | |
736 | { | |
737 | struct fw_card *card = fw_device(tgt->unit->device.parent)->card; | |
738 | struct Scsi_Host *shost = | |
739 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); | |
740 | unsigned long flags; | |
741 | ||
742 | spin_lock_irqsave(&card->lock, flags); | |
743 | ++tgt->dont_block; | |
744 | spin_unlock_irqrestore(&card->lock, flags); | |
745 | ||
746 | scsi_unblock_requests(shost); | |
747 | } | |
748 | ||
f8436158 SR |
749 | static int sbp2_lun2int(u16 lun) |
750 | { | |
751 | struct scsi_lun eight_bytes_lun; | |
752 | ||
753 | memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun)); | |
754 | eight_bytes_lun.scsi_lun[0] = (lun >> 8) & 0xff; | |
755 | eight_bytes_lun.scsi_lun[1] = lun & 0xff; | |
756 | ||
757 | return scsilun_to_int(&eight_bytes_lun); | |
758 | } | |
759 | ||
5a3c2be6 | 760 | static void sbp2_release_target(struct kref *kref) |
b3d6e151 | 761 | { |
5a3c2be6 SR |
762 | struct sbp2_target *tgt = container_of(kref, struct sbp2_target, kref); |
763 | struct sbp2_logical_unit *lu, *next; | |
764 | struct Scsi_Host *shost = | |
765 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); | |
f8436158 | 766 | struct scsi_device *sdev; |
855c603d | 767 | struct fw_device *device = fw_device(tgt->unit->device.parent); |
5a3c2be6 | 768 | |
2e2705bd SR |
769 | /* prevent deadlocks */ |
770 | sbp2_unblock(tgt); | |
771 | ||
5a3c2be6 | 772 | list_for_each_entry_safe(lu, next, &tgt->lu_list, link) { |
f8436158 SR |
773 | sdev = scsi_device_lookup(shost, 0, 0, sbp2_lun2int(lu->lun)); |
774 | if (sdev) { | |
775 | scsi_remove_device(sdev); | |
776 | scsi_device_put(sdev); | |
33f1c6c3 | 777 | } |
be6f48b0 SR |
778 | sbp2_send_management_orb(lu, tgt->node_id, lu->generation, |
779 | SBP2_LOGOUT_REQUEST, lu->login_id, NULL); | |
4dccd020 | 780 | |
5a3c2be6 SR |
781 | fw_core_remove_address_handler(&lu->address_handler); |
782 | list_del(&lu->link); | |
783 | kfree(lu); | |
784 | } | |
785 | scsi_remove_host(shost); | |
48f18c76 | 786 | fw_notify("released %s\n", tgt->bus_id); |
5a3c2be6 | 787 | |
1dc3bea7 | 788 | fw_unit_put(tgt->unit); |
5a3c2be6 | 789 | scsi_host_put(shost); |
855c603d | 790 | fw_device_put(device); |
b3d6e151 KH |
791 | } |
792 | ||
df8ec249 SR |
793 | static struct workqueue_struct *sbp2_wq; |
794 | ||
285838eb SR |
795 | /* |
796 | * Always get the target's kref when scheduling work on one its units. | |
797 | * Each workqueue job is responsible to call sbp2_target_put() upon return. | |
798 | */ | |
799 | static void sbp2_queue_work(struct sbp2_logical_unit *lu, unsigned long delay) | |
800 | { | |
801 | if (queue_delayed_work(sbp2_wq, &lu->work, delay)) | |
802 | kref_get(&lu->tgt->kref); | |
803 | } | |
804 | ||
805 | static void sbp2_target_put(struct sbp2_target *tgt) | |
806 | { | |
807 | kref_put(&tgt->kref, sbp2_release_target); | |
808 | } | |
809 | ||
51f9dbef JW |
810 | static void |
811 | complete_set_busy_timeout(struct fw_card *card, int rcode, | |
812 | void *payload, size_t length, void *done) | |
813 | { | |
814 | complete(done); | |
815 | } | |
816 | ||
17cff9ff JW |
817 | /* |
818 | * Write retransmit retry values into the BUSY_TIMEOUT register. | |
819 | * - The single-phase retry protocol is supported by all SBP-2 devices, but the | |
820 | * default retry_limit value is 0 (i.e. never retry transmission). We write a | |
821 | * saner value after logging into the device. | |
822 | * - The dual-phase retry protocol is optional to implement, and if not | |
823 | * supported, writes to the dual-phase portion of the register will be | |
824 | * ignored. We try to write the original 1394-1995 default here. | |
825 | * - In the case of devices that are also SBP-3-compliant, all writes are | |
826 | * ignored, as the register is read-only, but contains single-phase retry of | |
827 | * 15, which is what we're trying to set for all SBP-2 device anyway, so this | |
828 | * write attempt is safe and yields more consistent behavior for all devices. | |
829 | * | |
830 | * See section 8.3.2.3.5 of the 1394-1995 spec, section 6.2 of the SBP-2 spec, | |
831 | * and section 6.4 of the SBP-3 spec for further details. | |
832 | */ | |
51f9dbef JW |
833 | static void sbp2_set_busy_timeout(struct sbp2_logical_unit *lu) |
834 | { | |
835 | struct fw_device *device = fw_device(lu->tgt->unit->device.parent); | |
836 | DECLARE_COMPLETION_ONSTACK(done); | |
837 | struct fw_transaction t; | |
838 | static __be32 busy_timeout; | |
839 | ||
17cff9ff | 840 | busy_timeout = cpu_to_be32(SBP2_CYCLE_LIMIT | SBP2_RETRY_LIMIT); |
51f9dbef JW |
841 | |
842 | fw_send_request(device->card, &t, TCODE_WRITE_QUADLET_REQUEST, | |
843 | lu->tgt->node_id, lu->generation, device->max_speed, | |
844 | CSR_REGISTER_BASE + CSR_BUSY_TIMEOUT, &busy_timeout, | |
845 | sizeof(busy_timeout), complete_set_busy_timeout, &done); | |
846 | wait_for_completion(&done); | |
847 | } | |
848 | ||
5a3c2be6 SR |
849 | static void sbp2_reconnect(struct work_struct *work); |
850 | ||
7f37c426 KH |
851 | static void sbp2_login(struct work_struct *work) |
852 | { | |
5a3c2be6 SR |
853 | struct sbp2_logical_unit *lu = |
854 | container_of(work, struct sbp2_logical_unit, work.work); | |
48f18c76 SR |
855 | struct sbp2_target *tgt = lu->tgt; |
856 | struct fw_device *device = fw_device(tgt->unit->device.parent); | |
857 | struct Scsi_Host *shost; | |
5a3c2be6 | 858 | struct scsi_device *sdev; |
7f37c426 | 859 | struct sbp2_login_response response; |
5a3c2be6 | 860 | int generation, node_id, local_node_id; |
7f37c426 | 861 | |
be6f48b0 SR |
862 | if (fw_device_is_shutdown(device)) |
863 | goto out; | |
864 | ||
5a8a1bcd | 865 | generation = device->generation; |
b5d2a5e0 | 866 | smp_rmb(); /* node_id must not be older than generation */ |
5a8a1bcd SR |
867 | node_id = device->node_id; |
868 | local_node_id = device->card->node_id; | |
7f37c426 | 869 | |
ce896d95 | 870 | /* If this is a re-login attempt, log out, or we might be rejected. */ |
f8436158 | 871 | if (lu->has_sdev) |
ce896d95 SR |
872 | sbp2_send_management_orb(lu, device->node_id, generation, |
873 | SBP2_LOGOUT_REQUEST, lu->login_id, NULL); | |
874 | ||
5a3c2be6 SR |
875 | if (sbp2_send_management_orb(lu, node_id, generation, |
876 | SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) { | |
2e2705bd | 877 | if (lu->retries++ < 5) { |
285838eb | 878 | sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5)); |
2e2705bd | 879 | } else { |
48f18c76 SR |
880 | fw_error("%s: failed to login to LUN %04x\n", |
881 | tgt->bus_id, lu->lun); | |
2e2705bd SR |
882 | /* Let any waiting I/O fail from now on. */ |
883 | sbp2_unblock(lu->tgt); | |
884 | } | |
285838eb | 885 | goto out; |
7f37c426 KH |
886 | } |
887 | ||
48f18c76 SR |
888 | tgt->node_id = node_id; |
889 | tgt->address_high = local_node_id << 16; | |
2e2705bd | 890 | sbp2_set_generation(lu, generation); |
7f37c426 | 891 | |
5a3c2be6 | 892 | lu->command_block_agent_address = |
71ee9f01 SR |
893 | ((u64)(be32_to_cpu(response.command_block_agent.high) & 0xffff) |
894 | << 32) | be32_to_cpu(response.command_block_agent.low); | |
895 | lu->login_id = be32_to_cpu(response.misc) & 0xffff; | |
7f37c426 | 896 | |
48f18c76 SR |
897 | fw_notify("%s: logged in to LUN %04x (%d retries)\n", |
898 | tgt->bus_id, lu->lun, lu->retries); | |
7f37c426 | 899 | |
51f9dbef JW |
900 | /* set appropriate retry limit(s) in BUSY_TIMEOUT register */ |
901 | sbp2_set_busy_timeout(lu); | |
7f37c426 | 902 | |
5a3c2be6 SR |
903 | PREPARE_DELAYED_WORK(&lu->work, sbp2_reconnect); |
904 | sbp2_agent_reset(lu); | |
905 | ||
0fa6dfdb | 906 | /* This was a re-login. */ |
f8436158 | 907 | if (lu->has_sdev) { |
0fa6dfdb | 908 | sbp2_cancel_orbs(lu); |
2e2705bd | 909 | sbp2_conditionally_unblock(lu); |
0fa6dfdb SR |
910 | goto out; |
911 | } | |
912 | ||
9220f194 SR |
913 | if (lu->tgt->workarounds & SBP2_WORKAROUND_DELAY_INQUIRY) |
914 | ssleep(SBP2_INQUIRY_DELAY); | |
915 | ||
48f18c76 | 916 | shost = container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
f8436158 | 917 | sdev = __scsi_add_device(shost, 0, 0, sbp2_lun2int(lu->lun), lu); |
e80de370 SR |
918 | /* |
919 | * FIXME: We are unable to perform reconnects while in sbp2_login(). | |
920 | * Therefore __scsi_add_device() will get into trouble if a bus reset | |
921 | * happens in parallel. It will either fail or leave us with an | |
922 | * unusable sdev. As a workaround we check for this and retry the | |
923 | * whole login and SCSI probing. | |
924 | */ | |
1b9c12ba | 925 | |
e80de370 SR |
926 | /* Reported error during __scsi_add_device() */ |
927 | if (IS_ERR(sdev)) | |
928 | goto out_logout_login; | |
929 | ||
e80de370 SR |
930 | /* Unreported error during __scsi_add_device() */ |
931 | smp_rmb(); /* get current card generation */ | |
932 | if (generation != device->card->generation) { | |
933 | scsi_remove_device(sdev); | |
33f1c6c3 | 934 | scsi_device_put(sdev); |
e80de370 | 935 | goto out_logout_login; |
7f37c426 | 936 | } |
e80de370 SR |
937 | |
938 | /* No error during __scsi_add_device() */ | |
f8436158 SR |
939 | lu->has_sdev = true; |
940 | scsi_device_put(sdev); | |
2e2705bd | 941 | sbp2_allow_block(lu); |
e80de370 SR |
942 | goto out; |
943 | ||
944 | out_logout_login: | |
945 | smp_rmb(); /* generation may have changed */ | |
946 | generation = device->generation; | |
947 | smp_rmb(); /* node_id must not be older than generation */ | |
948 | ||
949 | sbp2_send_management_orb(lu, device->node_id, generation, | |
950 | SBP2_LOGOUT_REQUEST, lu->login_id, NULL); | |
951 | /* | |
952 | * If a bus reset happened, sbp2_update will have requeued | |
953 | * lu->work already. Reset the work from reconnect to login. | |
954 | */ | |
955 | PREPARE_DELAYED_WORK(&lu->work, sbp2_login); | |
285838eb | 956 | out: |
48f18c76 | 957 | sbp2_target_put(tgt); |
7f37c426 | 958 | } |
9ba136d0 | 959 | |
5a3c2be6 | 960 | static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry) |
9ba136d0 | 961 | { |
5a3c2be6 | 962 | struct sbp2_logical_unit *lu; |
9ba136d0 | 963 | |
5a3c2be6 SR |
964 | lu = kmalloc(sizeof(*lu), GFP_KERNEL); |
965 | if (!lu) | |
966 | return -ENOMEM; | |
9ba136d0 | 967 | |
5a3c2be6 SR |
968 | lu->address_handler.length = 0x100; |
969 | lu->address_handler.address_callback = sbp2_status_write; | |
970 | lu->address_handler.callback_data = lu; | |
9ba136d0 | 971 | |
5a3c2be6 SR |
972 | if (fw_core_add_address_handler(&lu->address_handler, |
973 | &fw_high_memory_region) < 0) { | |
974 | kfree(lu); | |
975 | return -ENOMEM; | |
976 | } | |
9ba136d0 | 977 | |
f8436158 SR |
978 | lu->tgt = tgt; |
979 | lu->lun = lun_entry & 0xffff; | |
980 | lu->retries = 0; | |
981 | lu->has_sdev = false; | |
982 | lu->blocked = false; | |
2e2705bd | 983 | ++tgt->dont_block; |
5a3c2be6 SR |
984 | INIT_LIST_HEAD(&lu->orb_list); |
985 | INIT_DELAYED_WORK(&lu->work, sbp2_login); | |
9ba136d0 | 986 | |
5a3c2be6 SR |
987 | list_add_tail(&lu->link, &tgt->lu_list); |
988 | return 0; | |
989 | } | |
ad85274f | 990 | |
5a3c2be6 SR |
991 | static int sbp2_scan_logical_unit_dir(struct sbp2_target *tgt, u32 *directory) |
992 | { | |
993 | struct fw_csr_iterator ci; | |
994 | int key, value; | |
9ba136d0 | 995 | |
5a3c2be6 SR |
996 | fw_csr_iterator_init(&ci, directory); |
997 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
998 | if (key == SBP2_CSR_LOGICAL_UNIT_NUMBER && | |
999 | sbp2_add_logical_unit(tgt, value) < 0) | |
1000 | return -ENOMEM; | |
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | static int sbp2_scan_unit_dir(struct sbp2_target *tgt, u32 *directory, | |
1005 | u32 *model, u32 *firmware_revision) | |
1006 | { | |
1007 | struct fw_csr_iterator ci; | |
1008 | int key, value; | |
384170da | 1009 | unsigned int timeout; |
5a3c2be6 SR |
1010 | |
1011 | fw_csr_iterator_init(&ci, directory); | |
9ba136d0 KH |
1012 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
1013 | switch (key) { | |
5a3c2be6 | 1014 | |
9ba136d0 | 1015 | case CSR_DEPENDENT_INFO | CSR_OFFSET: |
5a3c2be6 SR |
1016 | tgt->management_agent_address = |
1017 | CSR_REGISTER_BASE + 4 * value; | |
9ba136d0 | 1018 | break; |
5a3c2be6 SR |
1019 | |
1020 | case CSR_DIRECTORY_ID: | |
1021 | tgt->directory_id = value; | |
9ba136d0 | 1022 | break; |
5a3c2be6 | 1023 | |
9ba136d0 | 1024 | case CSR_MODEL: |
5a3c2be6 SR |
1025 | *model = value; |
1026 | break; | |
1027 | ||
1028 | case SBP2_CSR_FIRMWARE_REVISION: | |
1029 | *firmware_revision = value; | |
1030 | break; | |
1031 | ||
384170da JW |
1032 | case SBP2_CSR_UNIT_CHARACTERISTICS: |
1033 | /* the timeout value is stored in 500ms units */ | |
1034 | timeout = ((unsigned int) value >> 8 & 0xff) * 500; | |
1035 | timeout = max(timeout, SBP2_MIN_LOGIN_ORB_TIMEOUT); | |
1036 | tgt->mgt_orb_timeout = | |
1037 | min(timeout, SBP2_MAX_LOGIN_ORB_TIMEOUT); | |
1038 | ||
1039 | if (timeout > tgt->mgt_orb_timeout) | |
1040 | fw_notify("%s: config rom contains %ds " | |
1041 | "management ORB timeout, limiting " | |
48f18c76 | 1042 | "to %ds\n", tgt->bus_id, |
384170da JW |
1043 | timeout / 1000, |
1044 | tgt->mgt_orb_timeout / 1000); | |
1045 | break; | |
1046 | ||
5a3c2be6 SR |
1047 | case SBP2_CSR_LOGICAL_UNIT_NUMBER: |
1048 | if (sbp2_add_logical_unit(tgt, value) < 0) | |
1049 | return -ENOMEM; | |
1050 | break; | |
1051 | ||
1052 | case SBP2_CSR_LOGICAL_UNIT_DIRECTORY: | |
1053 | if (sbp2_scan_logical_unit_dir(tgt, ci.p + value) < 0) | |
1054 | return -ENOMEM; | |
9ba136d0 KH |
1055 | break; |
1056 | } | |
1057 | } | |
5a3c2be6 SR |
1058 | return 0; |
1059 | } | |
1060 | ||
1061 | static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model, | |
1062 | u32 firmware_revision) | |
1063 | { | |
1064 | int i; | |
05cca738 | 1065 | unsigned int w = sbp2_param_workarounds; |
2df222b8 SR |
1066 | |
1067 | if (w) | |
1068 | fw_notify("Please notify linux1394-devel@lists.sourceforge.net " | |
1069 | "if you need the workarounds parameter for %s\n", | |
48f18c76 | 1070 | tgt->bus_id); |
5a3c2be6 | 1071 | |
2df222b8 SR |
1072 | if (w & SBP2_WORKAROUND_OVERRIDE) |
1073 | goto out; | |
9ba136d0 KH |
1074 | |
1075 | for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) { | |
5a3c2be6 | 1076 | |
9ba136d0 KH |
1077 | if (sbp2_workarounds_table[i].firmware_revision != |
1078 | (firmware_revision & 0xffffff00)) | |
1079 | continue; | |
5a3c2be6 | 1080 | |
9ba136d0 KH |
1081 | if (sbp2_workarounds_table[i].model != model && |
1082 | sbp2_workarounds_table[i].model != ~0) | |
1083 | continue; | |
5a3c2be6 | 1084 | |
2df222b8 | 1085 | w |= sbp2_workarounds_table[i].workarounds; |
9ba136d0 KH |
1086 | break; |
1087 | } | |
2df222b8 SR |
1088 | out: |
1089 | if (w) | |
5a3c2be6 | 1090 | fw_notify("Workarounds for %s: 0x%x " |
9ba136d0 | 1091 | "(firmware_revision 0x%06x, model_id 0x%06x)\n", |
48f18c76 | 1092 | tgt->bus_id, w, firmware_revision, model); |
2df222b8 | 1093 | tgt->workarounds = w; |
5a3c2be6 SR |
1094 | } |
1095 | ||
1096 | static struct scsi_host_template scsi_driver_template; | |
1097 | ||
1098 | static int sbp2_probe(struct device *dev) | |
1099 | { | |
1100 | struct fw_unit *unit = fw_unit(dev); | |
1101 | struct fw_device *device = fw_device(unit->device.parent); | |
1102 | struct sbp2_target *tgt; | |
1103 | struct sbp2_logical_unit *lu; | |
1104 | struct Scsi_Host *shost; | |
1105 | u32 model, firmware_revision; | |
1106 | ||
1107 | shost = scsi_host_alloc(&scsi_driver_template, sizeof(*tgt)); | |
1108 | if (shost == NULL) | |
1109 | return -ENOMEM; | |
1110 | ||
1111 | tgt = (struct sbp2_target *)shost->hostdata; | |
1112 | unit->device.driver_data = tgt; | |
1113 | tgt->unit = unit; | |
1114 | kref_init(&tgt->kref); | |
1115 | INIT_LIST_HEAD(&tgt->lu_list); | |
48f18c76 | 1116 | tgt->bus_id = unit->device.bus_id; |
5a3c2be6 SR |
1117 | |
1118 | if (fw_device_enable_phys_dma(device) < 0) | |
1119 | goto fail_shost_put; | |
1120 | ||
1121 | if (scsi_add_host(shost, &unit->device) < 0) | |
1122 | goto fail_shost_put; | |
1123 | ||
855c603d | 1124 | fw_device_get(device); |
1dc3bea7 | 1125 | fw_unit_get(unit); |
855c603d | 1126 | |
5a3c2be6 SR |
1127 | /* Initialize to values that won't match anything in our table. */ |
1128 | firmware_revision = 0xff000000; | |
1129 | model = 0xff000000; | |
1130 | ||
1131 | /* implicit directory ID */ | |
1132 | tgt->directory_id = ((unit->directory - device->config_rom) * 4 | |
1133 | + CSR_CONFIG_ROM) & 0xffffff; | |
1134 | ||
1135 | if (sbp2_scan_unit_dir(tgt, unit->directory, &model, | |
1136 | &firmware_revision) < 0) | |
1137 | goto fail_tgt_put; | |
1138 | ||
1139 | sbp2_init_workarounds(tgt, model, firmware_revision); | |
9ba136d0 | 1140 | |
285838eb | 1141 | /* Do the login in a workqueue so we can easily reschedule retries. */ |
5a3c2be6 | 1142 | list_for_each_entry(lu, &tgt->lu_list, link) |
285838eb | 1143 | sbp2_queue_work(lu, 0); |
9ba136d0 | 1144 | return 0; |
ad85274f | 1145 | |
5a3c2be6 | 1146 | fail_tgt_put: |
285838eb | 1147 | sbp2_target_put(tgt); |
5a3c2be6 SR |
1148 | return -ENOMEM; |
1149 | ||
1150 | fail_shost_put: | |
1151 | scsi_host_put(shost); | |
1152 | return -ENOMEM; | |
9ba136d0 KH |
1153 | } |
1154 | ||
1155 | static int sbp2_remove(struct device *dev) | |
1156 | { | |
1157 | struct fw_unit *unit = fw_unit(dev); | |
5a3c2be6 | 1158 | struct sbp2_target *tgt = unit->device.driver_data; |
9ba136d0 | 1159 | |
285838eb | 1160 | sbp2_target_put(tgt); |
9ba136d0 KH |
1161 | return 0; |
1162 | } | |
1163 | ||
1164 | static void sbp2_reconnect(struct work_struct *work) | |
1165 | { | |
5a3c2be6 SR |
1166 | struct sbp2_logical_unit *lu = |
1167 | container_of(work, struct sbp2_logical_unit, work.work); | |
48f18c76 SR |
1168 | struct sbp2_target *tgt = lu->tgt; |
1169 | struct fw_device *device = fw_device(tgt->unit->device.parent); | |
9ba136d0 KH |
1170 | int generation, node_id, local_node_id; |
1171 | ||
be6f48b0 SR |
1172 | if (fw_device_is_shutdown(device)) |
1173 | goto out; | |
1174 | ||
5a8a1bcd | 1175 | generation = device->generation; |
b5d2a5e0 | 1176 | smp_rmb(); /* node_id must not be older than generation */ |
5a8a1bcd SR |
1177 | node_id = device->node_id; |
1178 | local_node_id = device->card->node_id; | |
9ba136d0 | 1179 | |
5a3c2be6 | 1180 | if (sbp2_send_management_orb(lu, node_id, generation, |
7f37c426 | 1181 | SBP2_RECONNECT_REQUEST, |
5a3c2be6 | 1182 | lu->login_id, NULL) < 0) { |
ce896d95 SR |
1183 | /* |
1184 | * If reconnect was impossible even though we are in the | |
1185 | * current generation, fall back and try to log in again. | |
1186 | * | |
1187 | * We could check for "Function rejected" status, but | |
1188 | * looking at the bus generation as simpler and more general. | |
1189 | */ | |
1190 | smp_rmb(); /* get current card generation */ | |
1191 | if (generation == device->card->generation || | |
1192 | lu->retries++ >= 5) { | |
48f18c76 | 1193 | fw_error("%s: failed to reconnect\n", tgt->bus_id); |
5a3c2be6 SR |
1194 | lu->retries = 0; |
1195 | PREPARE_DELAYED_WORK(&lu->work, sbp2_login); | |
7f37c426 | 1196 | } |
285838eb SR |
1197 | sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5)); |
1198 | goto out; | |
7f37c426 | 1199 | } |
9ba136d0 | 1200 | |
48f18c76 SR |
1201 | tgt->node_id = node_id; |
1202 | tgt->address_high = local_node_id << 16; | |
2e2705bd | 1203 | sbp2_set_generation(lu, generation); |
7f37c426 | 1204 | |
48f18c76 SR |
1205 | fw_notify("%s: reconnected to LUN %04x (%d retries)\n", |
1206 | tgt->bus_id, lu->lun, lu->retries); | |
5a3c2be6 SR |
1207 | |
1208 | sbp2_agent_reset(lu); | |
1209 | sbp2_cancel_orbs(lu); | |
2e2705bd | 1210 | sbp2_conditionally_unblock(lu); |
285838eb | 1211 | out: |
48f18c76 | 1212 | sbp2_target_put(tgt); |
9ba136d0 KH |
1213 | } |
1214 | ||
1215 | static void sbp2_update(struct fw_unit *unit) | |
1216 | { | |
5a3c2be6 SR |
1217 | struct sbp2_target *tgt = unit->device.driver_data; |
1218 | struct sbp2_logical_unit *lu; | |
9ba136d0 | 1219 | |
5a3c2be6 SR |
1220 | fw_device_enable_phys_dma(fw_device(unit->device.parent)); |
1221 | ||
1222 | /* | |
1223 | * Fw-core serializes sbp2_update() against sbp2_remove(). | |
1224 | * Iteration over tgt->lu_list is therefore safe here. | |
1225 | */ | |
1226 | list_for_each_entry(lu, &tgt->lu_list, link) { | |
2e2705bd | 1227 | sbp2_conditionally_block(lu); |
5a3c2be6 | 1228 | lu->retries = 0; |
285838eb | 1229 | sbp2_queue_work(lu, 0); |
5a3c2be6 | 1230 | } |
9ba136d0 KH |
1231 | } |
1232 | ||
1233 | #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e | |
1234 | #define SBP2_SW_VERSION_ENTRY 0x00010483 | |
1235 | ||
21ebcd12 | 1236 | static const struct fw_device_id sbp2_id_table[] = { |
9ba136d0 KH |
1237 | { |
1238 | .match_flags = FW_MATCH_SPECIFIER_ID | FW_MATCH_VERSION, | |
1239 | .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY, | |
5af4e5ea | 1240 | .version = SBP2_SW_VERSION_ENTRY, |
9ba136d0 KH |
1241 | }, |
1242 | { } | |
1243 | }; | |
1244 | ||
1245 | static struct fw_driver sbp2_driver = { | |
1246 | .driver = { | |
1247 | .owner = THIS_MODULE, | |
1248 | .name = sbp2_driver_name, | |
1249 | .bus = &fw_bus_type, | |
1250 | .probe = sbp2_probe, | |
1251 | .remove = sbp2_remove, | |
1252 | }, | |
1253 | .update = sbp2_update, | |
1254 | .id_table = sbp2_id_table, | |
1255 | }; | |
1256 | ||
fbb5423c KH |
1257 | static unsigned int |
1258 | sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data) | |
9ba136d0 | 1259 | { |
fbb5423c KH |
1260 | int sam_status; |
1261 | ||
9ba136d0 KH |
1262 | sense_data[0] = 0x70; |
1263 | sense_data[1] = 0x0; | |
1264 | sense_data[2] = sbp2_status[1]; | |
1265 | sense_data[3] = sbp2_status[4]; | |
1266 | sense_data[4] = sbp2_status[5]; | |
1267 | sense_data[5] = sbp2_status[6]; | |
1268 | sense_data[6] = sbp2_status[7]; | |
1269 | sense_data[7] = 10; | |
1270 | sense_data[8] = sbp2_status[8]; | |
1271 | sense_data[9] = sbp2_status[9]; | |
1272 | sense_data[10] = sbp2_status[10]; | |
1273 | sense_data[11] = sbp2_status[11]; | |
1274 | sense_data[12] = sbp2_status[2]; | |
1275 | sense_data[13] = sbp2_status[3]; | |
1276 | sense_data[14] = sbp2_status[12]; | |
1277 | sense_data[15] = sbp2_status[13]; | |
1278 | ||
fbb5423c | 1279 | sam_status = sbp2_status[0] & 0x3f; |
9ba136d0 | 1280 | |
fbb5423c KH |
1281 | switch (sam_status) { |
1282 | case SAM_STAT_GOOD: | |
9ba136d0 | 1283 | case SAM_STAT_CHECK_CONDITION: |
9ba136d0 | 1284 | case SAM_STAT_CONDITION_MET: |
fbb5423c | 1285 | case SAM_STAT_BUSY: |
9ba136d0 KH |
1286 | case SAM_STAT_RESERVATION_CONFLICT: |
1287 | case SAM_STAT_COMMAND_TERMINATED: | |
fbb5423c KH |
1288 | return DID_OK << 16 | sam_status; |
1289 | ||
9ba136d0 | 1290 | default: |
fbb5423c | 1291 | return DID_ERROR << 16; |
9ba136d0 KH |
1292 | } |
1293 | } | |
1294 | ||
1295 | static void | |
1296 | complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status) | |
1297 | { | |
6f061487 JF |
1298 | struct sbp2_command_orb *orb = |
1299 | container_of(base_orb, struct sbp2_command_orb, base); | |
5a3c2be6 | 1300 | struct fw_device *device = fw_device(orb->lu->tgt->unit->device.parent); |
9ba136d0 KH |
1301 | int result; |
1302 | ||
1303 | if (status != NULL) { | |
a77754a7 | 1304 | if (STATUS_GET_DEAD(*status)) |
e0e60215 | 1305 | sbp2_agent_reset_no_wait(orb->lu); |
9ba136d0 | 1306 | |
a77754a7 | 1307 | switch (STATUS_GET_RESPONSE(*status)) { |
9ba136d0 | 1308 | case SBP2_STATUS_REQUEST_COMPLETE: |
fbb5423c | 1309 | result = DID_OK << 16; |
9ba136d0 KH |
1310 | break; |
1311 | case SBP2_STATUS_TRANSPORT_FAILURE: | |
fbb5423c | 1312 | result = DID_BUS_BUSY << 16; |
9ba136d0 KH |
1313 | break; |
1314 | case SBP2_STATUS_ILLEGAL_REQUEST: | |
1315 | case SBP2_STATUS_VENDOR_DEPENDENT: | |
1316 | default: | |
fbb5423c | 1317 | result = DID_ERROR << 16; |
9ba136d0 KH |
1318 | break; |
1319 | } | |
1320 | ||
a77754a7 KH |
1321 | if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1) |
1322 | result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status), | |
9ba136d0 KH |
1323 | orb->cmd->sense_buffer); |
1324 | } else { | |
c781c06d KH |
1325 | /* |
1326 | * If the orb completes with status == NULL, something | |
9ba136d0 | 1327 | * went wrong, typically a bus reset happened mid-orb |
c781c06d KH |
1328 | * or when sending the write (less likely). |
1329 | */ | |
fbb5423c | 1330 | result = DID_BUS_BUSY << 16; |
2e2705bd | 1331 | sbp2_conditionally_block(orb->lu); |
9ba136d0 KH |
1332 | } |
1333 | ||
1334 | dma_unmap_single(device->card->device, orb->base.request_bus, | |
2d826cc5 | 1335 | sizeof(orb->request), DMA_TO_DEVICE); |
9ba136d0 | 1336 | |
412edf65 SR |
1337 | if (scsi_sg_count(orb->cmd) > 0) |
1338 | dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd), | |
1339 | scsi_sg_count(orb->cmd), | |
9ba136d0 | 1340 | orb->cmd->sc_data_direction); |
9ba136d0 KH |
1341 | |
1342 | if (orb->page_table_bus != 0) | |
1343 | dma_unmap_single(device->card->device, orb->page_table_bus, | |
b4be016a | 1344 | sizeof(orb->page_table), DMA_TO_DEVICE); |
9ba136d0 | 1345 | |
fbb5423c | 1346 | orb->cmd->result = result; |
9ba136d0 | 1347 | orb->done(orb->cmd); |
9ba136d0 KH |
1348 | } |
1349 | ||
5a3c2be6 SR |
1350 | static int |
1351 | sbp2_map_scatterlist(struct sbp2_command_orb *orb, struct fw_device *device, | |
1352 | struct sbp2_logical_unit *lu) | |
9ba136d0 | 1353 | { |
9ba136d0 KH |
1354 | struct scatterlist *sg; |
1355 | int sg_len, l, i, j, count; | |
9ba136d0 KH |
1356 | dma_addr_t sg_addr; |
1357 | ||
412edf65 SR |
1358 | sg = scsi_sglist(orb->cmd); |
1359 | count = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd), | |
9ba136d0 | 1360 | orb->cmd->sc_data_direction); |
95ffc5e3 KH |
1361 | if (count == 0) |
1362 | goto fail; | |
9ba136d0 | 1363 | |
c781c06d KH |
1364 | /* |
1365 | * Handle the special case where there is only one element in | |
9ba136d0 KH |
1366 | * the scatter list by converting it to an immediate block |
1367 | * request. This is also a workaround for broken devices such | |
1368 | * as the second generation iPod which doesn't support page | |
c781c06d KH |
1369 | * tables. |
1370 | */ | |
9ba136d0 | 1371 | if (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) { |
71ee9f01 SR |
1372 | orb->request.data_descriptor.high = |
1373 | cpu_to_be32(lu->tgt->address_high); | |
1374 | orb->request.data_descriptor.low = | |
1375 | cpu_to_be32(sg_dma_address(sg)); | |
1376 | orb->request.misc |= | |
1377 | cpu_to_be32(COMMAND_ORB_DATA_SIZE(sg_dma_len(sg))); | |
95ffc5e3 | 1378 | return 0; |
9ba136d0 KH |
1379 | } |
1380 | ||
c781c06d KH |
1381 | /* |
1382 | * Convert the scatterlist to an sbp2 page table. If any | |
36abb3b1 KHSR |
1383 | * scatterlist entries are too big for sbp2, we split them as we |
1384 | * go. Even if we ask the block I/O layer to not give us sg | |
1385 | * elements larger than 65535 bytes, some IOMMUs may merge sg elements | |
1386 | * during DMA mapping, and Linux currently doesn't prevent this. | |
c781c06d | 1387 | */ |
b7811da2 SR |
1388 | for (i = 0, j = 0; i < count; i++, sg = sg_next(sg)) { |
1389 | sg_len = sg_dma_len(sg); | |
1390 | sg_addr = sg_dma_address(sg); | |
9ba136d0 | 1391 | while (sg_len) { |
332ef331 SR |
1392 | /* FIXME: This won't get us out of the pinch. */ |
1393 | if (unlikely(j >= ARRAY_SIZE(orb->page_table))) { | |
1394 | fw_error("page table overflow\n"); | |
1395 | goto fail_page_table; | |
1396 | } | |
9ba136d0 | 1397 | l = min(sg_len, SBP2_MAX_SG_ELEMENT_LENGTH); |
71ee9f01 SR |
1398 | orb->page_table[j].low = cpu_to_be32(sg_addr); |
1399 | orb->page_table[j].high = cpu_to_be32(l << 16); | |
9ba136d0 KH |
1400 | sg_addr += l; |
1401 | sg_len -= l; | |
1402 | j++; | |
1403 | } | |
1404 | } | |
1405 | ||
b4be016a SR |
1406 | orb->page_table_bus = |
1407 | dma_map_single(device->card->device, orb->page_table, | |
1408 | sizeof(orb->page_table), DMA_TO_DEVICE); | |
1409 | if (dma_mapping_error(orb->page_table_bus)) | |
1410 | goto fail_page_table; | |
9ba136d0 | 1411 | |
c781c06d KH |
1412 | /* |
1413 | * The data_descriptor pointer is the one case where we need | |
9ba136d0 KH |
1414 | * to fill in the node ID part of the address. All other |
1415 | * pointers assume that the data referenced reside on the | |
1416 | * initiator (i.e. us), but data_descriptor can refer to data | |
c781c06d KH |
1417 | * on other nodes so we need to put our ID in descriptor.high. |
1418 | */ | |
71ee9f01 SR |
1419 | orb->request.data_descriptor.high = cpu_to_be32(lu->tgt->address_high); |
1420 | orb->request.data_descriptor.low = cpu_to_be32(orb->page_table_bus); | |
1421 | orb->request.misc |= cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT | | |
1422 | COMMAND_ORB_DATA_SIZE(j)); | |
9ba136d0 | 1423 | |
95ffc5e3 KH |
1424 | return 0; |
1425 | ||
1426 | fail_page_table: | |
412edf65 | 1427 | dma_unmap_sg(device->card->device, sg, scsi_sg_count(orb->cmd), |
95ffc5e3 KH |
1428 | orb->cmd->sc_data_direction); |
1429 | fail: | |
1430 | return -ENOMEM; | |
9ba136d0 KH |
1431 | } |
1432 | ||
9ba136d0 KH |
1433 | /* SCSI stack integration */ |
1434 | ||
1435 | static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done) | |
1436 | { | |
5a3c2be6 SR |
1437 | struct sbp2_logical_unit *lu = cmd->device->hostdata; |
1438 | struct fw_device *device = fw_device(lu->tgt->unit->device.parent); | |
9ba136d0 | 1439 | struct sbp2_command_orb *orb; |
05cca738 | 1440 | unsigned int max_payload; |
5a3c2be6 | 1441 | int retval = SCSI_MLQUEUE_HOST_BUSY; |
9ba136d0 | 1442 | |
c781c06d KH |
1443 | /* |
1444 | * Bidirectional commands are not yet implemented, and unknown | |
1445 | * transfer direction not handled. | |
1446 | */ | |
9ba136d0 | 1447 | if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) { |
8a8cea27 | 1448 | fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n"); |
e1b68c4d KH |
1449 | cmd->result = DID_ERROR << 16; |
1450 | done(cmd); | |
1451 | return 0; | |
9ba136d0 KH |
1452 | } |
1453 | ||
2d826cc5 | 1454 | orb = kzalloc(sizeof(*orb), GFP_ATOMIC); |
9ba136d0 KH |
1455 | if (orb == NULL) { |
1456 | fw_notify("failed to alloc orb\n"); | |
5a3c2be6 | 1457 | return SCSI_MLQUEUE_HOST_BUSY; |
9ba136d0 KH |
1458 | } |
1459 | ||
12f26aa1 KH |
1460 | /* Initialize rcode to something not RCODE_COMPLETE. */ |
1461 | orb->base.rcode = -1; | |
e57d2011 | 1462 | kref_init(&orb->base.kref); |
9ba136d0 | 1463 | |
5a3c2be6 | 1464 | orb->lu = lu; |
9ba136d0 KH |
1465 | orb->done = done; |
1466 | orb->cmd = cmd; | |
1467 | ||
71ee9f01 | 1468 | orb->request.next.high = cpu_to_be32(SBP2_ORB_NULL); |
c781c06d KH |
1469 | /* |
1470 | * At speed 100 we can do 512 bytes per packet, at speed 200, | |
9ba136d0 KH |
1471 | * 1024 bytes per packet etc. The SBP-2 max_payload field |
1472 | * specifies the max payload size as 2 ^ (max_payload + 2), so | |
c781c06d KH |
1473 | * if we set this to max_speed + 7, we get the right value. |
1474 | */ | |
25659f71 SR |
1475 | max_payload = min(device->max_speed + 7, |
1476 | device->card->max_receive - 1); | |
71ee9f01 | 1477 | orb->request.misc = cpu_to_be32( |
25659f71 | 1478 | COMMAND_ORB_MAX_PAYLOAD(max_payload) | |
f1397490 | 1479 | COMMAND_ORB_SPEED(device->max_speed) | |
71ee9f01 | 1480 | COMMAND_ORB_NOTIFY); |
9ba136d0 KH |
1481 | |
1482 | if (cmd->sc_data_direction == DMA_FROM_DEVICE) | |
0d7dcbf2 | 1483 | orb->request.misc |= cpu_to_be32(COMMAND_ORB_DIRECTION); |
9ba136d0 | 1484 | |
5a3c2be6 SR |
1485 | if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0) |
1486 | goto out; | |
9ba136d0 | 1487 | |
9ba136d0 KH |
1488 | memcpy(orb->request.command_block, cmd->cmnd, COMMAND_SIZE(*cmd->cmnd)); |
1489 | ||
1490 | orb->base.callback = complete_command_orb; | |
8526392a SR |
1491 | orb->base.request_bus = |
1492 | dma_map_single(device->card->device, &orb->request, | |
1493 | sizeof(orb->request), DMA_TO_DEVICE); | |
1494 | if (dma_mapping_error(orb->base.request_bus)) | |
5a3c2be6 | 1495 | goto out; |
82eff9db | 1496 | |
5a3c2be6 SR |
1497 | sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, lu->generation, |
1498 | lu->command_block_agent_address + SBP2_ORB_POINTER); | |
1499 | retval = 0; | |
1500 | out: | |
e57d2011 | 1501 | kref_put(&orb->base.kref, free_orb); |
5a3c2be6 | 1502 | return retval; |
9ba136d0 KH |
1503 | } |
1504 | ||
cfb01381 SR |
1505 | static int sbp2_scsi_slave_alloc(struct scsi_device *sdev) |
1506 | { | |
5a3c2be6 | 1507 | struct sbp2_logical_unit *lu = sdev->hostdata; |
cfb01381 | 1508 | |
5513c5f6 SR |
1509 | /* (Re-)Adding logical units via the SCSI stack is not supported. */ |
1510 | if (!lu) | |
1511 | return -ENOSYS; | |
1512 | ||
cfb01381 SR |
1513 | sdev->allow_restart = 1; |
1514 | ||
8ac3a47c SR |
1515 | /* SBP-2 requires quadlet alignment of the data buffers. */ |
1516 | blk_queue_update_dma_alignment(sdev->request_queue, 4 - 1); | |
465ff318 | 1517 | |
5a3c2be6 | 1518 | if (lu->tgt->workarounds & SBP2_WORKAROUND_INQUIRY_36) |
cfb01381 | 1519 | sdev->inquiry_len = 36; |
5a3c2be6 | 1520 | |
cfb01381 SR |
1521 | return 0; |
1522 | } | |
1523 | ||
9ba136d0 KH |
1524 | static int sbp2_scsi_slave_configure(struct scsi_device *sdev) |
1525 | { | |
5a3c2be6 | 1526 | struct sbp2_logical_unit *lu = sdev->hostdata; |
9ba136d0 | 1527 | |
cfb01381 SR |
1528 | sdev->use_10_for_rw = 1; |
1529 | ||
1530 | if (sdev->type == TYPE_ROM) | |
1531 | sdev->use_10_for_ms = 1; | |
5a3c2be6 | 1532 | |
9ba136d0 | 1533 | if (sdev->type == TYPE_DISK && |
5a3c2be6 | 1534 | lu->tgt->workarounds & SBP2_WORKAROUND_MODE_SENSE_8) |
9ba136d0 | 1535 | sdev->skip_ms_page_8 = 1; |
5a3c2be6 SR |
1536 | |
1537 | if (lu->tgt->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) | |
9ba136d0 | 1538 | sdev->fix_capacity = 1; |
5a3c2be6 SR |
1539 | |
1540 | if (lu->tgt->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS) | |
cf47c7a2 | 1541 | blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512); |
5a3c2be6 | 1542 | |
9ba136d0 KH |
1543 | return 0; |
1544 | } | |
1545 | ||
1546 | /* | |
1547 | * Called by scsi stack when something has really gone wrong. Usually | |
1548 | * called when a command has timed-out for some reason. | |
1549 | */ | |
1550 | static int sbp2_scsi_abort(struct scsi_cmnd *cmd) | |
1551 | { | |
5a3c2be6 | 1552 | struct sbp2_logical_unit *lu = cmd->device->hostdata; |
9ba136d0 | 1553 | |
48f18c76 | 1554 | fw_notify("%s: sbp2_scsi_abort\n", lu->tgt->bus_id); |
5a3c2be6 SR |
1555 | sbp2_agent_reset(lu); |
1556 | sbp2_cancel_orbs(lu); | |
9ba136d0 KH |
1557 | |
1558 | return SUCCESS; | |
1559 | } | |
1560 | ||
14e21986 SR |
1561 | /* |
1562 | * Format of /sys/bus/scsi/devices/.../ieee1394_id: | |
1563 | * u64 EUI-64 : u24 directory_ID : u16 LUN (all printed in hexadecimal) | |
1564 | * | |
1565 | * This is the concatenation of target port identifier and logical unit | |
1566 | * identifier as per SAM-2...SAM-4 annex A. | |
1567 | */ | |
1568 | static ssize_t | |
1569 | sbp2_sysfs_ieee1394_id_show(struct device *dev, struct device_attribute *attr, | |
1570 | char *buf) | |
1571 | { | |
1572 | struct scsi_device *sdev = to_scsi_device(dev); | |
5a3c2be6 | 1573 | struct sbp2_logical_unit *lu; |
14e21986 | 1574 | struct fw_device *device; |
14e21986 SR |
1575 | |
1576 | if (!sdev) | |
1577 | return 0; | |
14e21986 | 1578 | |
5a3c2be6 SR |
1579 | lu = sdev->hostdata; |
1580 | device = fw_device(lu->tgt->unit->device.parent); | |
14e21986 SR |
1581 | |
1582 | return sprintf(buf, "%08x%08x:%06x:%04x\n", | |
1583 | device->config_rom[3], device->config_rom[4], | |
5a3c2be6 | 1584 | lu->tgt->directory_id, lu->lun); |
14e21986 SR |
1585 | } |
1586 | ||
1587 | static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL); | |
1588 | ||
1589 | static struct device_attribute *sbp2_scsi_sysfs_attrs[] = { | |
1590 | &dev_attr_ieee1394_id, | |
1591 | NULL | |
1592 | }; | |
1593 | ||
9ba136d0 KH |
1594 | static struct scsi_host_template scsi_driver_template = { |
1595 | .module = THIS_MODULE, | |
1596 | .name = "SBP-2 IEEE-1394", | |
b02b6bc4 | 1597 | .proc_name = sbp2_driver_name, |
9ba136d0 | 1598 | .queuecommand = sbp2_scsi_queuecommand, |
cfb01381 | 1599 | .slave_alloc = sbp2_scsi_slave_alloc, |
9ba136d0 KH |
1600 | .slave_configure = sbp2_scsi_slave_configure, |
1601 | .eh_abort_handler = sbp2_scsi_abort, | |
1602 | .this_id = -1, | |
1603 | .sg_tablesize = SG_ALL, | |
1604 | .use_clustering = ENABLE_CLUSTERING, | |
02af8e70 SR |
1605 | .cmd_per_lun = 1, |
1606 | .can_queue = 1, | |
14e21986 | 1607 | .sdev_attrs = sbp2_scsi_sysfs_attrs, |
9ba136d0 KH |
1608 | }; |
1609 | ||
9ba136d0 KH |
1610 | MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>"); |
1611 | MODULE_DESCRIPTION("SCSI over IEEE1394"); | |
1612 | MODULE_LICENSE("GPL"); | |
1613 | MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table); | |
1614 | ||
1e4c7b0d OH |
1615 | /* Provide a module alias so root-on-sbp2 initrds don't break. */ |
1616 | #ifndef CONFIG_IEEE1394_SBP2_MODULE | |
1617 | MODULE_ALIAS("sbp2"); | |
1618 | #endif | |
1619 | ||
9ba136d0 KH |
1620 | static int __init sbp2_init(void) |
1621 | { | |
df8ec249 SR |
1622 | sbp2_wq = create_singlethread_workqueue(KBUILD_MODNAME); |
1623 | if (!sbp2_wq) | |
1624 | return -ENOMEM; | |
1625 | ||
9ba136d0 KH |
1626 | return driver_register(&sbp2_driver.driver); |
1627 | } | |
1628 | ||
1629 | static void __exit sbp2_cleanup(void) | |
1630 | { | |
1631 | driver_unregister(&sbp2_driver.driver); | |
df8ec249 | 1632 | destroy_workqueue(sbp2_wq); |
9ba136d0 KH |
1633 | } |
1634 | ||
1635 | module_init(sbp2_init); | |
1636 | module_exit(sbp2_cleanup); |