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Commit | Line | Data |
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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 |
51f9dbef | 176 | #define SBP2_RETRY_LIMIT 0xf /* 15 retries */ |
9ba136d0 KH |
177 | |
178 | #define SBP2_DIRECTION_TO_MEDIA 0x0 | |
179 | #define SBP2_DIRECTION_FROM_MEDIA 0x1 | |
180 | ||
181 | /* Unit directory keys */ | |
384170da | 182 | #define SBP2_CSR_UNIT_CHARACTERISTICS 0x3a |
5a3c2be6 SR |
183 | #define SBP2_CSR_FIRMWARE_REVISION 0x3c |
184 | #define SBP2_CSR_LOGICAL_UNIT_NUMBER 0x14 | |
185 | #define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4 | |
9ba136d0 | 186 | |
9ba136d0 KH |
187 | /* Management orb opcodes */ |
188 | #define SBP2_LOGIN_REQUEST 0x0 | |
189 | #define SBP2_QUERY_LOGINS_REQUEST 0x1 | |
190 | #define SBP2_RECONNECT_REQUEST 0x3 | |
191 | #define SBP2_SET_PASSWORD_REQUEST 0x4 | |
192 | #define SBP2_LOGOUT_REQUEST 0x7 | |
193 | #define SBP2_ABORT_TASK_REQUEST 0xb | |
194 | #define SBP2_ABORT_TASK_SET 0xc | |
195 | #define SBP2_LOGICAL_UNIT_RESET 0xe | |
196 | #define SBP2_TARGET_RESET_REQUEST 0xf | |
197 | ||
198 | /* Offsets for command block agent registers */ | |
199 | #define SBP2_AGENT_STATE 0x00 | |
200 | #define SBP2_AGENT_RESET 0x04 | |
201 | #define SBP2_ORB_POINTER 0x08 | |
202 | #define SBP2_DOORBELL 0x10 | |
203 | #define SBP2_UNSOLICITED_STATUS_ENABLE 0x14 | |
204 | ||
205 | /* Status write response codes */ | |
206 | #define SBP2_STATUS_REQUEST_COMPLETE 0x0 | |
207 | #define SBP2_STATUS_TRANSPORT_FAILURE 0x1 | |
208 | #define SBP2_STATUS_ILLEGAL_REQUEST 0x2 | |
209 | #define SBP2_STATUS_VENDOR_DEPENDENT 0x3 | |
210 | ||
a77754a7 KH |
211 | #define STATUS_GET_ORB_HIGH(v) ((v).status & 0xffff) |
212 | #define STATUS_GET_SBP_STATUS(v) (((v).status >> 16) & 0xff) | |
213 | #define STATUS_GET_LEN(v) (((v).status >> 24) & 0x07) | |
214 | #define STATUS_GET_DEAD(v) (((v).status >> 27) & 0x01) | |
215 | #define STATUS_GET_RESPONSE(v) (((v).status >> 28) & 0x03) | |
216 | #define STATUS_GET_SOURCE(v) (((v).status >> 30) & 0x03) | |
217 | #define STATUS_GET_ORB_LOW(v) ((v).orb_low) | |
218 | #define STATUS_GET_DATA(v) ((v).data) | |
9ba136d0 KH |
219 | |
220 | struct sbp2_status { | |
221 | u32 status; | |
222 | u32 orb_low; | |
223 | u8 data[24]; | |
224 | }; | |
225 | ||
226 | struct sbp2_pointer { | |
71ee9f01 SR |
227 | __be32 high; |
228 | __be32 low; | |
9ba136d0 KH |
229 | }; |
230 | ||
231 | struct sbp2_orb { | |
232 | struct fw_transaction t; | |
e57d2011 | 233 | struct kref kref; |
9ba136d0 KH |
234 | dma_addr_t request_bus; |
235 | int rcode; | |
236 | struct sbp2_pointer pointer; | |
a98e2719 | 237 | void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status); |
9ba136d0 KH |
238 | struct list_head link; |
239 | }; | |
240 | ||
a77754a7 KH |
241 | #define MANAGEMENT_ORB_LUN(v) ((v)) |
242 | #define MANAGEMENT_ORB_FUNCTION(v) ((v) << 16) | |
243 | #define MANAGEMENT_ORB_RECONNECT(v) ((v) << 20) | |
5cd54c94 | 244 | #define MANAGEMENT_ORB_EXCLUSIVE(v) ((v) ? 1 << 28 : 0) |
a77754a7 KH |
245 | #define MANAGEMENT_ORB_REQUEST_FORMAT(v) ((v) << 29) |
246 | #define MANAGEMENT_ORB_NOTIFY ((1) << 31) | |
9ba136d0 | 247 | |
a77754a7 KH |
248 | #define MANAGEMENT_ORB_RESPONSE_LENGTH(v) ((v)) |
249 | #define MANAGEMENT_ORB_PASSWORD_LENGTH(v) ((v) << 16) | |
9ba136d0 KH |
250 | |
251 | struct sbp2_management_orb { | |
252 | struct sbp2_orb base; | |
253 | struct { | |
254 | struct sbp2_pointer password; | |
255 | struct sbp2_pointer response; | |
71ee9f01 SR |
256 | __be32 misc; |
257 | __be32 length; | |
9ba136d0 KH |
258 | struct sbp2_pointer status_fifo; |
259 | } request; | |
260 | __be32 response[4]; | |
261 | dma_addr_t response_bus; | |
262 | struct completion done; | |
263 | struct sbp2_status status; | |
264 | }; | |
265 | ||
9ba136d0 | 266 | struct sbp2_login_response { |
71ee9f01 | 267 | __be32 misc; |
9ba136d0 | 268 | struct sbp2_pointer command_block_agent; |
71ee9f01 | 269 | __be32 reconnect_hold; |
9ba136d0 | 270 | }; |
a77754a7 KH |
271 | #define COMMAND_ORB_DATA_SIZE(v) ((v)) |
272 | #define COMMAND_ORB_PAGE_SIZE(v) ((v) << 16) | |
273 | #define COMMAND_ORB_PAGE_TABLE_PRESENT ((1) << 19) | |
274 | #define COMMAND_ORB_MAX_PAYLOAD(v) ((v) << 20) | |
275 | #define COMMAND_ORB_SPEED(v) ((v) << 24) | |
276 | #define COMMAND_ORB_DIRECTION(v) ((v) << 27) | |
277 | #define COMMAND_ORB_REQUEST_FORMAT(v) ((v) << 29) | |
278 | #define COMMAND_ORB_NOTIFY ((1) << 31) | |
9ba136d0 KH |
279 | |
280 | struct sbp2_command_orb { | |
281 | struct sbp2_orb base; | |
282 | struct { | |
283 | struct sbp2_pointer next; | |
284 | struct sbp2_pointer data_descriptor; | |
71ee9f01 | 285 | __be32 misc; |
9ba136d0 KH |
286 | u8 command_block[12]; |
287 | } request; | |
288 | struct scsi_cmnd *cmd; | |
289 | scsi_done_fn_t done; | |
5a3c2be6 | 290 | struct sbp2_logical_unit *lu; |
9ba136d0 | 291 | |
9fb2dd12 | 292 | struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8))); |
9ba136d0 | 293 | dma_addr_t page_table_bus; |
9ba136d0 KH |
294 | }; |
295 | ||
296 | /* | |
297 | * List of devices with known bugs. | |
298 | * | |
299 | * The firmware_revision field, masked with 0xffff00, is the best | |
300 | * indicator for the type of bridge chip of a device. It yields a few | |
301 | * false positives but this did not break correctly behaving devices | |
302 | * so far. We use ~0 as a wildcard, since the 24 bit values we get | |
303 | * from the config rom can never match that. | |
304 | */ | |
305 | static const struct { | |
306 | u32 firmware_revision; | |
307 | u32 model; | |
05cca738 | 308 | unsigned int workarounds; |
9ba136d0 KH |
309 | } sbp2_workarounds_table[] = { |
310 | /* DViCO Momobay CX-1 with TSB42AA9 bridge */ { | |
311 | .firmware_revision = 0x002800, | |
312 | .model = 0x001010, | |
313 | .workarounds = SBP2_WORKAROUND_INQUIRY_36 | | |
314 | SBP2_WORKAROUND_MODE_SENSE_8, | |
315 | }, | |
9220f194 SR |
316 | /* DViCO Momobay FX-3A with TSB42AA9A bridge */ { |
317 | .firmware_revision = 0x002800, | |
318 | .model = 0x000000, | |
319 | .workarounds = SBP2_WORKAROUND_DELAY_INQUIRY, | |
320 | }, | |
9ba136d0 KH |
321 | /* Initio bridges, actually only needed for some older ones */ { |
322 | .firmware_revision = 0x000200, | |
323 | .model = ~0, | |
324 | .workarounds = SBP2_WORKAROUND_INQUIRY_36, | |
325 | }, | |
326 | /* Symbios bridge */ { | |
327 | .firmware_revision = 0xa0b800, | |
328 | .model = ~0, | |
329 | .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, | |
330 | }, | |
2aa9ff7f SR |
331 | /* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ { |
332 | .firmware_revision = 0x002600, | |
333 | .model = ~0, | |
334 | .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, | |
335 | }, | |
c781c06d KH |
336 | |
337 | /* | |
338 | * There are iPods (2nd gen, 3rd gen) with model_id == 0, but | |
9ba136d0 KH |
339 | * these iPods do not feature the read_capacity bug according |
340 | * to one report. Read_capacity behaviour as well as model_id | |
c781c06d KH |
341 | * could change due to Apple-supplied firmware updates though. |
342 | */ | |
343 | ||
9ba136d0 KH |
344 | /* iPod 4th generation. */ { |
345 | .firmware_revision = 0x0a2700, | |
346 | .model = 0x000021, | |
347 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, | |
348 | }, | |
349 | /* iPod mini */ { | |
350 | .firmware_revision = 0x0a2700, | |
351 | .model = 0x000023, | |
352 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, | |
353 | }, | |
354 | /* iPod Photo */ { | |
355 | .firmware_revision = 0x0a2700, | |
356 | .model = 0x00007e, | |
357 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, | |
358 | } | |
359 | }; | |
360 | ||
e57d2011 KH |
361 | static void |
362 | free_orb(struct kref *kref) | |
363 | { | |
364 | struct sbp2_orb *orb = container_of(kref, struct sbp2_orb, kref); | |
365 | ||
366 | kfree(orb); | |
367 | } | |
368 | ||
9ba136d0 KH |
369 | static void |
370 | sbp2_status_write(struct fw_card *card, struct fw_request *request, | |
371 | int tcode, int destination, int source, | |
372 | int generation, int speed, | |
373 | unsigned long long offset, | |
374 | void *payload, size_t length, void *callback_data) | |
375 | { | |
5a3c2be6 | 376 | struct sbp2_logical_unit *lu = callback_data; |
9ba136d0 KH |
377 | struct sbp2_orb *orb; |
378 | struct sbp2_status status; | |
379 | size_t header_size; | |
380 | unsigned long flags; | |
381 | ||
382 | if (tcode != TCODE_WRITE_BLOCK_REQUEST || | |
2d826cc5 | 383 | length == 0 || length > sizeof(status)) { |
9ba136d0 KH |
384 | fw_send_response(card, request, RCODE_TYPE_ERROR); |
385 | return; | |
386 | } | |
387 | ||
388 | header_size = min(length, 2 * sizeof(u32)); | |
389 | fw_memcpy_from_be32(&status, payload, header_size); | |
390 | if (length > header_size) | |
391 | memcpy(status.data, payload + 8, length - header_size); | |
a77754a7 | 392 | if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) { |
9ba136d0 KH |
393 | fw_notify("non-orb related status write, not handled\n"); |
394 | fw_send_response(card, request, RCODE_COMPLETE); | |
395 | return; | |
396 | } | |
397 | ||
398 | /* Lookup the orb corresponding to this status write. */ | |
399 | spin_lock_irqsave(&card->lock, flags); | |
5a3c2be6 | 400 | list_for_each_entry(orb, &lu->orb_list, link) { |
a77754a7 | 401 | if (STATUS_GET_ORB_HIGH(status) == 0 && |
e57d2011 KH |
402 | STATUS_GET_ORB_LOW(status) == orb->request_bus) { |
403 | orb->rcode = RCODE_COMPLETE; | |
9ba136d0 KH |
404 | list_del(&orb->link); |
405 | break; | |
406 | } | |
407 | } | |
408 | spin_unlock_irqrestore(&card->lock, flags); | |
409 | ||
5a3c2be6 | 410 | if (&orb->link != &lu->orb_list) |
9ba136d0 KH |
411 | orb->callback(orb, &status); |
412 | else | |
413 | fw_error("status write for unknown orb\n"); | |
414 | ||
e57d2011 KH |
415 | kref_put(&orb->kref, free_orb); |
416 | ||
9ba136d0 KH |
417 | fw_send_response(card, request, RCODE_COMPLETE); |
418 | } | |
419 | ||
420 | static void | |
421 | complete_transaction(struct fw_card *card, int rcode, | |
422 | void *payload, size_t length, void *data) | |
423 | { | |
424 | struct sbp2_orb *orb = data; | |
425 | unsigned long flags; | |
426 | ||
e57d2011 KH |
427 | /* |
428 | * This is a little tricky. We can get the status write for | |
429 | * the orb before we get this callback. The status write | |
430 | * handler above will assume the orb pointer transaction was | |
431 | * successful and set the rcode to RCODE_COMPLETE for the orb. | |
432 | * So this callback only sets the rcode if it hasn't already | |
433 | * been set and only does the cleanup if the transaction | |
434 | * failed and we didn't already get a status write. | |
435 | */ | |
436 | spin_lock_irqsave(&card->lock, flags); | |
437 | ||
438 | if (orb->rcode == -1) | |
439 | orb->rcode = rcode; | |
440 | if (orb->rcode != RCODE_COMPLETE) { | |
9ba136d0 | 441 | list_del(&orb->link); |
1b34e974 | 442 | spin_unlock_irqrestore(&card->lock, flags); |
9ba136d0 | 443 | orb->callback(orb, NULL); |
1b34e974 SR |
444 | } else { |
445 | spin_unlock_irqrestore(&card->lock, flags); | |
9ba136d0 | 446 | } |
e57d2011 | 447 | |
e57d2011 | 448 | kref_put(&orb->kref, free_orb); |
9ba136d0 KH |
449 | } |
450 | ||
451 | static void | |
5a3c2be6 | 452 | sbp2_send_orb(struct sbp2_orb *orb, struct sbp2_logical_unit *lu, |
9ba136d0 KH |
453 | int node_id, int generation, u64 offset) |
454 | { | |
5a3c2be6 | 455 | struct fw_device *device = fw_device(lu->tgt->unit->device.parent); |
9ba136d0 KH |
456 | unsigned long flags; |
457 | ||
458 | orb->pointer.high = 0; | |
71ee9f01 | 459 | orb->pointer.low = cpu_to_be32(orb->request_bus); |
9ba136d0 KH |
460 | |
461 | spin_lock_irqsave(&device->card->lock, flags); | |
5a3c2be6 | 462 | list_add_tail(&orb->link, &lu->orb_list); |
9ba136d0 KH |
463 | spin_unlock_irqrestore(&device->card->lock, flags); |
464 | ||
e57d2011 KH |
465 | /* Take a ref for the orb list and for the transaction callback. */ |
466 | kref_get(&orb->kref); | |
467 | kref_get(&orb->kref); | |
468 | ||
9ba136d0 | 469 | fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST, |
f1397490 | 470 | node_id, generation, device->max_speed, offset, |
2d826cc5 | 471 | &orb->pointer, sizeof(orb->pointer), |
9ba136d0 KH |
472 | complete_transaction, orb); |
473 | } | |
474 | ||
5a3c2be6 | 475 | static int sbp2_cancel_orbs(struct sbp2_logical_unit *lu) |
9ba136d0 | 476 | { |
5a3c2be6 | 477 | struct fw_device *device = fw_device(lu->tgt->unit->device.parent); |
9ba136d0 KH |
478 | struct sbp2_orb *orb, *next; |
479 | struct list_head list; | |
480 | unsigned long flags; | |
2aaad97b | 481 | int retval = -ENOENT; |
9ba136d0 KH |
482 | |
483 | INIT_LIST_HEAD(&list); | |
484 | spin_lock_irqsave(&device->card->lock, flags); | |
5a3c2be6 | 485 | list_splice_init(&lu->orb_list, &list); |
9ba136d0 KH |
486 | spin_unlock_irqrestore(&device->card->lock, flags); |
487 | ||
488 | list_for_each_entry_safe(orb, next, &list, link) { | |
2aaad97b | 489 | retval = 0; |
730c32f5 KH |
490 | if (fw_cancel_transaction(device->card, &orb->t) == 0) |
491 | continue; | |
492 | ||
9ba136d0 KH |
493 | orb->rcode = RCODE_CANCELLED; |
494 | orb->callback(orb, NULL); | |
495 | } | |
9ba136d0 | 496 | |
2aaad97b | 497 | return retval; |
1d3d52c5 KH |
498 | } |
499 | ||
9ba136d0 KH |
500 | static void |
501 | complete_management_orb(struct sbp2_orb *base_orb, struct sbp2_status *status) | |
502 | { | |
503 | struct sbp2_management_orb *orb = | |
6f061487 | 504 | container_of(base_orb, struct sbp2_management_orb, base); |
9ba136d0 KH |
505 | |
506 | if (status) | |
2d826cc5 | 507 | memcpy(&orb->status, status, sizeof(*status)); |
9ba136d0 KH |
508 | complete(&orb->done); |
509 | } | |
510 | ||
511 | static int | |
5a3c2be6 SR |
512 | sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id, |
513 | int generation, int function, int lun_or_login_id, | |
514 | void *response) | |
9ba136d0 | 515 | { |
5a3c2be6 | 516 | struct fw_device *device = fw_device(lu->tgt->unit->device.parent); |
9ba136d0 | 517 | struct sbp2_management_orb *orb; |
a4c379c1 | 518 | unsigned int timeout; |
9ba136d0 KH |
519 | int retval = -ENOMEM; |
520 | ||
be6f48b0 SR |
521 | if (function == SBP2_LOGOUT_REQUEST && fw_device_is_shutdown(device)) |
522 | return 0; | |
523 | ||
2d826cc5 | 524 | orb = kzalloc(sizeof(*orb), GFP_ATOMIC); |
9ba136d0 KH |
525 | if (orb == NULL) |
526 | return -ENOMEM; | |
527 | ||
e57d2011 | 528 | kref_init(&orb->base.kref); |
9ba136d0 KH |
529 | orb->response_bus = |
530 | dma_map_single(device->card->device, &orb->response, | |
2d826cc5 | 531 | sizeof(orb->response), DMA_FROM_DEVICE); |
82eff9db | 532 | if (dma_mapping_error(orb->response_bus)) |
7aa48481 | 533 | goto fail_mapping_response; |
9ba136d0 | 534 | |
71ee9f01 SR |
535 | orb->request.response.high = 0; |
536 | orb->request.response.low = cpu_to_be32(orb->response_bus); | |
9ba136d0 | 537 | |
71ee9f01 | 538 | orb->request.misc = cpu_to_be32( |
a77754a7 KH |
539 | MANAGEMENT_ORB_NOTIFY | |
540 | MANAGEMENT_ORB_FUNCTION(function) | | |
71ee9f01 SR |
541 | MANAGEMENT_ORB_LUN(lun_or_login_id)); |
542 | orb->request.length = cpu_to_be32( | |
543 | MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response))); | |
9ba136d0 | 544 | |
71ee9f01 SR |
545 | orb->request.status_fifo.high = |
546 | cpu_to_be32(lu->address_handler.offset >> 32); | |
547 | orb->request.status_fifo.low = | |
548 | cpu_to_be32(lu->address_handler.offset); | |
9ba136d0 | 549 | |
9ba136d0 | 550 | if (function == SBP2_LOGIN_REQUEST) { |
14dc992a | 551 | /* Ask for 2^2 == 4 seconds reconnect grace period */ |
71ee9f01 | 552 | orb->request.misc |= cpu_to_be32( |
14dc992a | 553 | MANAGEMENT_ORB_RECONNECT(2) | |
71ee9f01 | 554 | MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login)); |
384170da | 555 | timeout = lu->tgt->mgt_orb_timeout; |
a4c379c1 JW |
556 | } else { |
557 | timeout = SBP2_ORB_TIMEOUT; | |
9ba136d0 KH |
558 | } |
559 | ||
9ba136d0 KH |
560 | init_completion(&orb->done); |
561 | orb->base.callback = complete_management_orb; | |
2aaad97b | 562 | |
7aa48481 SR |
563 | orb->base.request_bus = |
564 | dma_map_single(device->card->device, &orb->request, | |
565 | sizeof(orb->request), DMA_TO_DEVICE); | |
566 | if (dma_mapping_error(orb->base.request_bus)) | |
567 | goto fail_mapping_request; | |
568 | ||
5a3c2be6 SR |
569 | sbp2_send_orb(&orb->base, lu, node_id, generation, |
570 | lu->tgt->management_agent_address); | |
9ba136d0 | 571 | |
a4c379c1 | 572 | wait_for_completion_timeout(&orb->done, msecs_to_jiffies(timeout)); |
9ba136d0 | 573 | |
9ba136d0 | 574 | retval = -EIO; |
5a3c2be6 | 575 | if (sbp2_cancel_orbs(lu) == 0) { |
48f18c76 SR |
576 | fw_error("%s: orb reply timed out, rcode=0x%02x\n", |
577 | lu->tgt->bus_id, orb->base.rcode); | |
9ba136d0 KH |
578 | goto out; |
579 | } | |
580 | ||
2aaad97b | 581 | if (orb->base.rcode != RCODE_COMPLETE) { |
48f18c76 SR |
582 | fw_error("%s: management write failed, rcode 0x%02x\n", |
583 | lu->tgt->bus_id, orb->base.rcode); | |
9ba136d0 KH |
584 | goto out; |
585 | } | |
586 | ||
a77754a7 KH |
587 | if (STATUS_GET_RESPONSE(orb->status) != 0 || |
588 | STATUS_GET_SBP_STATUS(orb->status) != 0) { | |
48f18c76 | 589 | fw_error("%s: error status: %d:%d\n", lu->tgt->bus_id, |
a77754a7 KH |
590 | STATUS_GET_RESPONSE(orb->status), |
591 | STATUS_GET_SBP_STATUS(orb->status)); | |
9ba136d0 KH |
592 | goto out; |
593 | } | |
594 | ||
595 | retval = 0; | |
596 | out: | |
597 | dma_unmap_single(device->card->device, orb->base.request_bus, | |
2d826cc5 | 598 | sizeof(orb->request), DMA_TO_DEVICE); |
7aa48481 | 599 | fail_mapping_request: |
9ba136d0 | 600 | dma_unmap_single(device->card->device, orb->response_bus, |
2d826cc5 | 601 | sizeof(orb->response), DMA_FROM_DEVICE); |
7aa48481 | 602 | fail_mapping_response: |
9ba136d0 | 603 | if (response) |
71ee9f01 | 604 | memcpy(response, orb->response, sizeof(orb->response)); |
e57d2011 | 605 | kref_put(&orb->base.kref, free_orb); |
9ba136d0 KH |
606 | |
607 | return retval; | |
608 | } | |
609 | ||
610 | static void | |
611 | complete_agent_reset_write(struct fw_card *card, int rcode, | |
e0e60215 | 612 | void *payload, size_t length, void *done) |
9ba136d0 | 613 | { |
e0e60215 SR |
614 | complete(done); |
615 | } | |
616 | ||
617 | static void sbp2_agent_reset(struct sbp2_logical_unit *lu) | |
618 | { | |
619 | struct fw_device *device = fw_device(lu->tgt->unit->device.parent); | |
620 | DECLARE_COMPLETION_ONSTACK(done); | |
621 | struct fw_transaction t; | |
622 | static u32 z; | |
9ba136d0 | 623 | |
e0e60215 SR |
624 | fw_send_request(device->card, &t, TCODE_WRITE_QUADLET_REQUEST, |
625 | lu->tgt->node_id, lu->generation, device->max_speed, | |
626 | lu->command_block_agent_address + SBP2_AGENT_RESET, | |
627 | &z, sizeof(z), complete_agent_reset_write, &done); | |
628 | wait_for_completion(&done); | |
9ba136d0 KH |
629 | } |
630 | ||
e0e60215 SR |
631 | static void |
632 | complete_agent_reset_write_no_wait(struct fw_card *card, int rcode, | |
633 | void *payload, size_t length, void *data) | |
634 | { | |
635 | kfree(data); | |
636 | } | |
637 | ||
638 | static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu) | |
9ba136d0 | 639 | { |
5a3c2be6 | 640 | struct fw_device *device = fw_device(lu->tgt->unit->device.parent); |
9ba136d0 | 641 | struct fw_transaction *t; |
e0e60215 | 642 | static u32 z; |
9ba136d0 | 643 | |
e0e60215 | 644 | t = kmalloc(sizeof(*t), GFP_ATOMIC); |
9ba136d0 | 645 | if (t == NULL) |
e0e60215 | 646 | return; |
9ba136d0 KH |
647 | |
648 | fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST, | |
5a3c2be6 SR |
649 | lu->tgt->node_id, lu->generation, device->max_speed, |
650 | lu->command_block_agent_address + SBP2_AGENT_RESET, | |
e0e60215 | 651 | &z, sizeof(z), complete_agent_reset_write_no_wait, t); |
9ba136d0 KH |
652 | } |
653 | ||
2e2705bd SR |
654 | static void sbp2_set_generation(struct sbp2_logical_unit *lu, int generation) |
655 | { | |
656 | struct fw_card *card = fw_device(lu->tgt->unit->device.parent)->card; | |
657 | unsigned long flags; | |
658 | ||
659 | /* serialize with comparisons of lu->generation and card->generation */ | |
660 | spin_lock_irqsave(&card->lock, flags); | |
661 | lu->generation = generation; | |
662 | spin_unlock_irqrestore(&card->lock, flags); | |
663 | } | |
664 | ||
665 | static inline void sbp2_allow_block(struct sbp2_logical_unit *lu) | |
666 | { | |
667 | /* | |
668 | * We may access dont_block without taking card->lock here: | |
669 | * All callers of sbp2_allow_block() and all callers of sbp2_unblock() | |
670 | * are currently serialized against each other. | |
671 | * And a wrong result in sbp2_conditionally_block()'s access of | |
672 | * dont_block is rather harmless, it simply misses its first chance. | |
673 | */ | |
674 | --lu->tgt->dont_block; | |
675 | } | |
676 | ||
677 | /* | |
678 | * Blocks lu->tgt if all of the following conditions are met: | |
679 | * - Login, INQUIRY, and high-level SCSI setup of all of the target's | |
680 | * logical units have been finished (indicated by dont_block == 0). | |
681 | * - lu->generation is stale. | |
682 | * | |
683 | * Note, scsi_block_requests() must be called while holding card->lock, | |
684 | * otherwise it might foil sbp2_[conditionally_]unblock()'s attempt to | |
685 | * unblock the target. | |
686 | */ | |
687 | static void sbp2_conditionally_block(struct sbp2_logical_unit *lu) | |
688 | { | |
689 | struct sbp2_target *tgt = lu->tgt; | |
690 | struct fw_card *card = fw_device(tgt->unit->device.parent)->card; | |
691 | struct Scsi_Host *shost = | |
692 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); | |
693 | unsigned long flags; | |
694 | ||
695 | spin_lock_irqsave(&card->lock, flags); | |
696 | if (!tgt->dont_block && !lu->blocked && | |
697 | lu->generation != card->generation) { | |
698 | lu->blocked = true; | |
699 | if (++tgt->blocked == 1) { | |
700 | scsi_block_requests(shost); | |
701 | fw_notify("blocked %s\n", lu->tgt->bus_id); | |
702 | } | |
703 | } | |
704 | spin_unlock_irqrestore(&card->lock, flags); | |
705 | } | |
706 | ||
707 | /* | |
708 | * Unblocks lu->tgt as soon as all its logical units can be unblocked. | |
709 | * Note, it is harmless to run scsi_unblock_requests() outside the | |
710 | * card->lock protected section. On the other hand, running it inside | |
711 | * the section might clash with shost->host_lock. | |
712 | */ | |
713 | static void sbp2_conditionally_unblock(struct sbp2_logical_unit *lu) | |
714 | { | |
715 | struct sbp2_target *tgt = lu->tgt; | |
716 | struct fw_card *card = fw_device(tgt->unit->device.parent)->card; | |
717 | struct Scsi_Host *shost = | |
718 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); | |
719 | unsigned long flags; | |
720 | bool unblock = false; | |
721 | ||
722 | spin_lock_irqsave(&card->lock, flags); | |
723 | if (lu->blocked && lu->generation == card->generation) { | |
724 | lu->blocked = false; | |
725 | unblock = --tgt->blocked == 0; | |
726 | } | |
727 | spin_unlock_irqrestore(&card->lock, flags); | |
728 | ||
729 | if (unblock) { | |
730 | scsi_unblock_requests(shost); | |
731 | fw_notify("unblocked %s\n", lu->tgt->bus_id); | |
732 | } | |
733 | } | |
734 | ||
735 | /* | |
736 | * Prevents future blocking of tgt and unblocks it. | |
737 | * Note, it is harmless to run scsi_unblock_requests() outside the | |
738 | * card->lock protected section. On the other hand, running it inside | |
739 | * the section might clash with shost->host_lock. | |
740 | */ | |
741 | static void sbp2_unblock(struct sbp2_target *tgt) | |
742 | { | |
743 | struct fw_card *card = fw_device(tgt->unit->device.parent)->card; | |
744 | struct Scsi_Host *shost = | |
745 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); | |
746 | unsigned long flags; | |
747 | ||
748 | spin_lock_irqsave(&card->lock, flags); | |
749 | ++tgt->dont_block; | |
750 | spin_unlock_irqrestore(&card->lock, flags); | |
751 | ||
752 | scsi_unblock_requests(shost); | |
753 | } | |
754 | ||
f8436158 SR |
755 | static int sbp2_lun2int(u16 lun) |
756 | { | |
757 | struct scsi_lun eight_bytes_lun; | |
758 | ||
759 | memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun)); | |
760 | eight_bytes_lun.scsi_lun[0] = (lun >> 8) & 0xff; | |
761 | eight_bytes_lun.scsi_lun[1] = lun & 0xff; | |
762 | ||
763 | return scsilun_to_int(&eight_bytes_lun); | |
764 | } | |
765 | ||
5a3c2be6 | 766 | static void sbp2_release_target(struct kref *kref) |
b3d6e151 | 767 | { |
5a3c2be6 SR |
768 | struct sbp2_target *tgt = container_of(kref, struct sbp2_target, kref); |
769 | struct sbp2_logical_unit *lu, *next; | |
770 | struct Scsi_Host *shost = | |
771 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); | |
f8436158 | 772 | struct scsi_device *sdev; |
855c603d | 773 | struct fw_device *device = fw_device(tgt->unit->device.parent); |
5a3c2be6 | 774 | |
2e2705bd SR |
775 | /* prevent deadlocks */ |
776 | sbp2_unblock(tgt); | |
777 | ||
5a3c2be6 | 778 | list_for_each_entry_safe(lu, next, &tgt->lu_list, link) { |
f8436158 SR |
779 | sdev = scsi_device_lookup(shost, 0, 0, sbp2_lun2int(lu->lun)); |
780 | if (sdev) { | |
781 | scsi_remove_device(sdev); | |
782 | scsi_device_put(sdev); | |
33f1c6c3 | 783 | } |
be6f48b0 SR |
784 | sbp2_send_management_orb(lu, tgt->node_id, lu->generation, |
785 | SBP2_LOGOUT_REQUEST, lu->login_id, NULL); | |
4dccd020 | 786 | |
5a3c2be6 SR |
787 | fw_core_remove_address_handler(&lu->address_handler); |
788 | list_del(&lu->link); | |
789 | kfree(lu); | |
790 | } | |
791 | scsi_remove_host(shost); | |
48f18c76 | 792 | fw_notify("released %s\n", tgt->bus_id); |
5a3c2be6 | 793 | |
1dc3bea7 | 794 | fw_unit_put(tgt->unit); |
5a3c2be6 | 795 | scsi_host_put(shost); |
855c603d | 796 | fw_device_put(device); |
b3d6e151 KH |
797 | } |
798 | ||
df8ec249 SR |
799 | static struct workqueue_struct *sbp2_wq; |
800 | ||
285838eb SR |
801 | /* |
802 | * Always get the target's kref when scheduling work on one its units. | |
803 | * Each workqueue job is responsible to call sbp2_target_put() upon return. | |
804 | */ | |
805 | static void sbp2_queue_work(struct sbp2_logical_unit *lu, unsigned long delay) | |
806 | { | |
807 | if (queue_delayed_work(sbp2_wq, &lu->work, delay)) | |
808 | kref_get(&lu->tgt->kref); | |
809 | } | |
810 | ||
811 | static void sbp2_target_put(struct sbp2_target *tgt) | |
812 | { | |
813 | kref_put(&tgt->kref, sbp2_release_target); | |
814 | } | |
815 | ||
51f9dbef JW |
816 | static void |
817 | complete_set_busy_timeout(struct fw_card *card, int rcode, | |
818 | void *payload, size_t length, void *done) | |
819 | { | |
820 | complete(done); | |
821 | } | |
822 | ||
823 | static void sbp2_set_busy_timeout(struct sbp2_logical_unit *lu) | |
824 | { | |
825 | struct fw_device *device = fw_device(lu->tgt->unit->device.parent); | |
826 | DECLARE_COMPLETION_ONSTACK(done); | |
827 | struct fw_transaction t; | |
828 | static __be32 busy_timeout; | |
829 | ||
830 | /* FIXME: we should try to set dual-phase cycle_limit too */ | |
831 | busy_timeout = cpu_to_be32(SBP2_RETRY_LIMIT); | |
832 | ||
833 | fw_send_request(device->card, &t, TCODE_WRITE_QUADLET_REQUEST, | |
834 | lu->tgt->node_id, lu->generation, device->max_speed, | |
835 | CSR_REGISTER_BASE + CSR_BUSY_TIMEOUT, &busy_timeout, | |
836 | sizeof(busy_timeout), complete_set_busy_timeout, &done); | |
837 | wait_for_completion(&done); | |
838 | } | |
839 | ||
5a3c2be6 SR |
840 | static void sbp2_reconnect(struct work_struct *work); |
841 | ||
7f37c426 KH |
842 | static void sbp2_login(struct work_struct *work) |
843 | { | |
5a3c2be6 SR |
844 | struct sbp2_logical_unit *lu = |
845 | container_of(work, struct sbp2_logical_unit, work.work); | |
48f18c76 SR |
846 | struct sbp2_target *tgt = lu->tgt; |
847 | struct fw_device *device = fw_device(tgt->unit->device.parent); | |
848 | struct Scsi_Host *shost; | |
5a3c2be6 | 849 | struct scsi_device *sdev; |
7f37c426 | 850 | struct sbp2_login_response response; |
5a3c2be6 | 851 | int generation, node_id, local_node_id; |
7f37c426 | 852 | |
be6f48b0 SR |
853 | if (fw_device_is_shutdown(device)) |
854 | goto out; | |
855 | ||
5a8a1bcd | 856 | generation = device->generation; |
b5d2a5e0 | 857 | smp_rmb(); /* node_id must not be older than generation */ |
5a8a1bcd SR |
858 | node_id = device->node_id; |
859 | local_node_id = device->card->node_id; | |
7f37c426 | 860 | |
ce896d95 | 861 | /* If this is a re-login attempt, log out, or we might be rejected. */ |
f8436158 | 862 | if (lu->has_sdev) |
ce896d95 SR |
863 | sbp2_send_management_orb(lu, device->node_id, generation, |
864 | SBP2_LOGOUT_REQUEST, lu->login_id, NULL); | |
865 | ||
5a3c2be6 SR |
866 | if (sbp2_send_management_orb(lu, node_id, generation, |
867 | SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) { | |
2e2705bd | 868 | if (lu->retries++ < 5) { |
285838eb | 869 | sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5)); |
2e2705bd | 870 | } else { |
48f18c76 SR |
871 | fw_error("%s: failed to login to LUN %04x\n", |
872 | tgt->bus_id, lu->lun); | |
2e2705bd SR |
873 | /* Let any waiting I/O fail from now on. */ |
874 | sbp2_unblock(lu->tgt); | |
875 | } | |
285838eb | 876 | goto out; |
7f37c426 KH |
877 | } |
878 | ||
48f18c76 SR |
879 | tgt->node_id = node_id; |
880 | tgt->address_high = local_node_id << 16; | |
2e2705bd | 881 | sbp2_set_generation(lu, generation); |
7f37c426 | 882 | |
5a3c2be6 | 883 | lu->command_block_agent_address = |
71ee9f01 SR |
884 | ((u64)(be32_to_cpu(response.command_block_agent.high) & 0xffff) |
885 | << 32) | be32_to_cpu(response.command_block_agent.low); | |
886 | lu->login_id = be32_to_cpu(response.misc) & 0xffff; | |
7f37c426 | 887 | |
48f18c76 SR |
888 | fw_notify("%s: logged in to LUN %04x (%d retries)\n", |
889 | tgt->bus_id, lu->lun, lu->retries); | |
7f37c426 | 890 | |
51f9dbef JW |
891 | /* set appropriate retry limit(s) in BUSY_TIMEOUT register */ |
892 | sbp2_set_busy_timeout(lu); | |
7f37c426 | 893 | |
5a3c2be6 SR |
894 | PREPARE_DELAYED_WORK(&lu->work, sbp2_reconnect); |
895 | sbp2_agent_reset(lu); | |
896 | ||
0fa6dfdb | 897 | /* This was a re-login. */ |
f8436158 | 898 | if (lu->has_sdev) { |
0fa6dfdb | 899 | sbp2_cancel_orbs(lu); |
2e2705bd | 900 | sbp2_conditionally_unblock(lu); |
0fa6dfdb SR |
901 | goto out; |
902 | } | |
903 | ||
9220f194 SR |
904 | if (lu->tgt->workarounds & SBP2_WORKAROUND_DELAY_INQUIRY) |
905 | ssleep(SBP2_INQUIRY_DELAY); | |
906 | ||
48f18c76 | 907 | shost = container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
f8436158 | 908 | sdev = __scsi_add_device(shost, 0, 0, sbp2_lun2int(lu->lun), lu); |
e80de370 SR |
909 | /* |
910 | * FIXME: We are unable to perform reconnects while in sbp2_login(). | |
911 | * Therefore __scsi_add_device() will get into trouble if a bus reset | |
912 | * happens in parallel. It will either fail or leave us with an | |
913 | * unusable sdev. As a workaround we check for this and retry the | |
914 | * whole login and SCSI probing. | |
915 | */ | |
1b9c12ba | 916 | |
e80de370 SR |
917 | /* Reported error during __scsi_add_device() */ |
918 | if (IS_ERR(sdev)) | |
919 | goto out_logout_login; | |
920 | ||
e80de370 SR |
921 | /* Unreported error during __scsi_add_device() */ |
922 | smp_rmb(); /* get current card generation */ | |
923 | if (generation != device->card->generation) { | |
924 | scsi_remove_device(sdev); | |
33f1c6c3 | 925 | scsi_device_put(sdev); |
e80de370 | 926 | goto out_logout_login; |
7f37c426 | 927 | } |
e80de370 SR |
928 | |
929 | /* No error during __scsi_add_device() */ | |
f8436158 SR |
930 | lu->has_sdev = true; |
931 | scsi_device_put(sdev); | |
2e2705bd | 932 | sbp2_allow_block(lu); |
e80de370 SR |
933 | goto out; |
934 | ||
935 | out_logout_login: | |
936 | smp_rmb(); /* generation may have changed */ | |
937 | generation = device->generation; | |
938 | smp_rmb(); /* node_id must not be older than generation */ | |
939 | ||
940 | sbp2_send_management_orb(lu, device->node_id, generation, | |
941 | SBP2_LOGOUT_REQUEST, lu->login_id, NULL); | |
942 | /* | |
943 | * If a bus reset happened, sbp2_update will have requeued | |
944 | * lu->work already. Reset the work from reconnect to login. | |
945 | */ | |
946 | PREPARE_DELAYED_WORK(&lu->work, sbp2_login); | |
285838eb | 947 | out: |
48f18c76 | 948 | sbp2_target_put(tgt); |
7f37c426 | 949 | } |
9ba136d0 | 950 | |
5a3c2be6 | 951 | static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry) |
9ba136d0 | 952 | { |
5a3c2be6 | 953 | struct sbp2_logical_unit *lu; |
9ba136d0 | 954 | |
5a3c2be6 SR |
955 | lu = kmalloc(sizeof(*lu), GFP_KERNEL); |
956 | if (!lu) | |
957 | return -ENOMEM; | |
9ba136d0 | 958 | |
5a3c2be6 SR |
959 | lu->address_handler.length = 0x100; |
960 | lu->address_handler.address_callback = sbp2_status_write; | |
961 | lu->address_handler.callback_data = lu; | |
9ba136d0 | 962 | |
5a3c2be6 SR |
963 | if (fw_core_add_address_handler(&lu->address_handler, |
964 | &fw_high_memory_region) < 0) { | |
965 | kfree(lu); | |
966 | return -ENOMEM; | |
967 | } | |
9ba136d0 | 968 | |
f8436158 SR |
969 | lu->tgt = tgt; |
970 | lu->lun = lun_entry & 0xffff; | |
971 | lu->retries = 0; | |
972 | lu->has_sdev = false; | |
973 | lu->blocked = false; | |
2e2705bd | 974 | ++tgt->dont_block; |
5a3c2be6 SR |
975 | INIT_LIST_HEAD(&lu->orb_list); |
976 | INIT_DELAYED_WORK(&lu->work, sbp2_login); | |
9ba136d0 | 977 | |
5a3c2be6 SR |
978 | list_add_tail(&lu->link, &tgt->lu_list); |
979 | return 0; | |
980 | } | |
ad85274f | 981 | |
5a3c2be6 SR |
982 | static int sbp2_scan_logical_unit_dir(struct sbp2_target *tgt, u32 *directory) |
983 | { | |
984 | struct fw_csr_iterator ci; | |
985 | int key, value; | |
9ba136d0 | 986 | |
5a3c2be6 SR |
987 | fw_csr_iterator_init(&ci, directory); |
988 | while (fw_csr_iterator_next(&ci, &key, &value)) | |
989 | if (key == SBP2_CSR_LOGICAL_UNIT_NUMBER && | |
990 | sbp2_add_logical_unit(tgt, value) < 0) | |
991 | return -ENOMEM; | |
992 | return 0; | |
993 | } | |
994 | ||
995 | static int sbp2_scan_unit_dir(struct sbp2_target *tgt, u32 *directory, | |
996 | u32 *model, u32 *firmware_revision) | |
997 | { | |
998 | struct fw_csr_iterator ci; | |
999 | int key, value; | |
384170da | 1000 | unsigned int timeout; |
5a3c2be6 SR |
1001 | |
1002 | fw_csr_iterator_init(&ci, directory); | |
9ba136d0 KH |
1003 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
1004 | switch (key) { | |
5a3c2be6 | 1005 | |
9ba136d0 | 1006 | case CSR_DEPENDENT_INFO | CSR_OFFSET: |
5a3c2be6 SR |
1007 | tgt->management_agent_address = |
1008 | CSR_REGISTER_BASE + 4 * value; | |
9ba136d0 | 1009 | break; |
5a3c2be6 SR |
1010 | |
1011 | case CSR_DIRECTORY_ID: | |
1012 | tgt->directory_id = value; | |
9ba136d0 | 1013 | break; |
5a3c2be6 | 1014 | |
9ba136d0 | 1015 | case CSR_MODEL: |
5a3c2be6 SR |
1016 | *model = value; |
1017 | break; | |
1018 | ||
1019 | case SBP2_CSR_FIRMWARE_REVISION: | |
1020 | *firmware_revision = value; | |
1021 | break; | |
1022 | ||
384170da JW |
1023 | case SBP2_CSR_UNIT_CHARACTERISTICS: |
1024 | /* the timeout value is stored in 500ms units */ | |
1025 | timeout = ((unsigned int) value >> 8 & 0xff) * 500; | |
1026 | timeout = max(timeout, SBP2_MIN_LOGIN_ORB_TIMEOUT); | |
1027 | tgt->mgt_orb_timeout = | |
1028 | min(timeout, SBP2_MAX_LOGIN_ORB_TIMEOUT); | |
1029 | ||
1030 | if (timeout > tgt->mgt_orb_timeout) | |
1031 | fw_notify("%s: config rom contains %ds " | |
1032 | "management ORB timeout, limiting " | |
48f18c76 | 1033 | "to %ds\n", tgt->bus_id, |
384170da JW |
1034 | timeout / 1000, |
1035 | tgt->mgt_orb_timeout / 1000); | |
1036 | break; | |
1037 | ||
5a3c2be6 SR |
1038 | case SBP2_CSR_LOGICAL_UNIT_NUMBER: |
1039 | if (sbp2_add_logical_unit(tgt, value) < 0) | |
1040 | return -ENOMEM; | |
1041 | break; | |
1042 | ||
1043 | case SBP2_CSR_LOGICAL_UNIT_DIRECTORY: | |
1044 | if (sbp2_scan_logical_unit_dir(tgt, ci.p + value) < 0) | |
1045 | return -ENOMEM; | |
9ba136d0 KH |
1046 | break; |
1047 | } | |
1048 | } | |
5a3c2be6 SR |
1049 | return 0; |
1050 | } | |
1051 | ||
1052 | static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model, | |
1053 | u32 firmware_revision) | |
1054 | { | |
1055 | int i; | |
05cca738 | 1056 | unsigned int w = sbp2_param_workarounds; |
2df222b8 SR |
1057 | |
1058 | if (w) | |
1059 | fw_notify("Please notify linux1394-devel@lists.sourceforge.net " | |
1060 | "if you need the workarounds parameter for %s\n", | |
48f18c76 | 1061 | tgt->bus_id); |
5a3c2be6 | 1062 | |
2df222b8 SR |
1063 | if (w & SBP2_WORKAROUND_OVERRIDE) |
1064 | goto out; | |
9ba136d0 KH |
1065 | |
1066 | for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) { | |
5a3c2be6 | 1067 | |
9ba136d0 KH |
1068 | if (sbp2_workarounds_table[i].firmware_revision != |
1069 | (firmware_revision & 0xffffff00)) | |
1070 | continue; | |
5a3c2be6 | 1071 | |
9ba136d0 KH |
1072 | if (sbp2_workarounds_table[i].model != model && |
1073 | sbp2_workarounds_table[i].model != ~0) | |
1074 | continue; | |
5a3c2be6 | 1075 | |
2df222b8 | 1076 | w |= sbp2_workarounds_table[i].workarounds; |
9ba136d0 KH |
1077 | break; |
1078 | } | |
2df222b8 SR |
1079 | out: |
1080 | if (w) | |
5a3c2be6 | 1081 | fw_notify("Workarounds for %s: 0x%x " |
9ba136d0 | 1082 | "(firmware_revision 0x%06x, model_id 0x%06x)\n", |
48f18c76 | 1083 | tgt->bus_id, w, firmware_revision, model); |
2df222b8 | 1084 | tgt->workarounds = w; |
5a3c2be6 SR |
1085 | } |
1086 | ||
1087 | static struct scsi_host_template scsi_driver_template; | |
1088 | ||
1089 | static int sbp2_probe(struct device *dev) | |
1090 | { | |
1091 | struct fw_unit *unit = fw_unit(dev); | |
1092 | struct fw_device *device = fw_device(unit->device.parent); | |
1093 | struct sbp2_target *tgt; | |
1094 | struct sbp2_logical_unit *lu; | |
1095 | struct Scsi_Host *shost; | |
1096 | u32 model, firmware_revision; | |
1097 | ||
1098 | shost = scsi_host_alloc(&scsi_driver_template, sizeof(*tgt)); | |
1099 | if (shost == NULL) | |
1100 | return -ENOMEM; | |
1101 | ||
1102 | tgt = (struct sbp2_target *)shost->hostdata; | |
1103 | unit->device.driver_data = tgt; | |
1104 | tgt->unit = unit; | |
1105 | kref_init(&tgt->kref); | |
1106 | INIT_LIST_HEAD(&tgt->lu_list); | |
48f18c76 | 1107 | tgt->bus_id = unit->device.bus_id; |
5a3c2be6 SR |
1108 | |
1109 | if (fw_device_enable_phys_dma(device) < 0) | |
1110 | goto fail_shost_put; | |
1111 | ||
1112 | if (scsi_add_host(shost, &unit->device) < 0) | |
1113 | goto fail_shost_put; | |
1114 | ||
855c603d | 1115 | fw_device_get(device); |
1dc3bea7 | 1116 | fw_unit_get(unit); |
855c603d | 1117 | |
5a3c2be6 SR |
1118 | /* Initialize to values that won't match anything in our table. */ |
1119 | firmware_revision = 0xff000000; | |
1120 | model = 0xff000000; | |
1121 | ||
1122 | /* implicit directory ID */ | |
1123 | tgt->directory_id = ((unit->directory - device->config_rom) * 4 | |
1124 | + CSR_CONFIG_ROM) & 0xffffff; | |
1125 | ||
1126 | if (sbp2_scan_unit_dir(tgt, unit->directory, &model, | |
1127 | &firmware_revision) < 0) | |
1128 | goto fail_tgt_put; | |
1129 | ||
1130 | sbp2_init_workarounds(tgt, model, firmware_revision); | |
9ba136d0 | 1131 | |
285838eb | 1132 | /* Do the login in a workqueue so we can easily reschedule retries. */ |
5a3c2be6 | 1133 | list_for_each_entry(lu, &tgt->lu_list, link) |
285838eb | 1134 | sbp2_queue_work(lu, 0); |
9ba136d0 | 1135 | return 0; |
ad85274f | 1136 | |
5a3c2be6 | 1137 | fail_tgt_put: |
285838eb | 1138 | sbp2_target_put(tgt); |
5a3c2be6 SR |
1139 | return -ENOMEM; |
1140 | ||
1141 | fail_shost_put: | |
1142 | scsi_host_put(shost); | |
1143 | return -ENOMEM; | |
9ba136d0 KH |
1144 | } |
1145 | ||
1146 | static int sbp2_remove(struct device *dev) | |
1147 | { | |
1148 | struct fw_unit *unit = fw_unit(dev); | |
5a3c2be6 | 1149 | struct sbp2_target *tgt = unit->device.driver_data; |
9ba136d0 | 1150 | |
285838eb | 1151 | sbp2_target_put(tgt); |
9ba136d0 KH |
1152 | return 0; |
1153 | } | |
1154 | ||
1155 | static void sbp2_reconnect(struct work_struct *work) | |
1156 | { | |
5a3c2be6 SR |
1157 | struct sbp2_logical_unit *lu = |
1158 | container_of(work, struct sbp2_logical_unit, work.work); | |
48f18c76 SR |
1159 | struct sbp2_target *tgt = lu->tgt; |
1160 | struct fw_device *device = fw_device(tgt->unit->device.parent); | |
9ba136d0 KH |
1161 | int generation, node_id, local_node_id; |
1162 | ||
be6f48b0 SR |
1163 | if (fw_device_is_shutdown(device)) |
1164 | goto out; | |
1165 | ||
5a8a1bcd | 1166 | generation = device->generation; |
b5d2a5e0 | 1167 | smp_rmb(); /* node_id must not be older than generation */ |
5a8a1bcd SR |
1168 | node_id = device->node_id; |
1169 | local_node_id = device->card->node_id; | |
9ba136d0 | 1170 | |
5a3c2be6 | 1171 | if (sbp2_send_management_orb(lu, node_id, generation, |
7f37c426 | 1172 | SBP2_RECONNECT_REQUEST, |
5a3c2be6 | 1173 | lu->login_id, NULL) < 0) { |
ce896d95 SR |
1174 | /* |
1175 | * If reconnect was impossible even though we are in the | |
1176 | * current generation, fall back and try to log in again. | |
1177 | * | |
1178 | * We could check for "Function rejected" status, but | |
1179 | * looking at the bus generation as simpler and more general. | |
1180 | */ | |
1181 | smp_rmb(); /* get current card generation */ | |
1182 | if (generation == device->card->generation || | |
1183 | lu->retries++ >= 5) { | |
48f18c76 | 1184 | fw_error("%s: failed to reconnect\n", tgt->bus_id); |
5a3c2be6 SR |
1185 | lu->retries = 0; |
1186 | PREPARE_DELAYED_WORK(&lu->work, sbp2_login); | |
7f37c426 | 1187 | } |
285838eb SR |
1188 | sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5)); |
1189 | goto out; | |
7f37c426 | 1190 | } |
9ba136d0 | 1191 | |
48f18c76 SR |
1192 | tgt->node_id = node_id; |
1193 | tgt->address_high = local_node_id << 16; | |
2e2705bd | 1194 | sbp2_set_generation(lu, generation); |
7f37c426 | 1195 | |
48f18c76 SR |
1196 | fw_notify("%s: reconnected to LUN %04x (%d retries)\n", |
1197 | tgt->bus_id, lu->lun, lu->retries); | |
5a3c2be6 SR |
1198 | |
1199 | sbp2_agent_reset(lu); | |
1200 | sbp2_cancel_orbs(lu); | |
2e2705bd | 1201 | sbp2_conditionally_unblock(lu); |
285838eb | 1202 | out: |
48f18c76 | 1203 | sbp2_target_put(tgt); |
9ba136d0 KH |
1204 | } |
1205 | ||
1206 | static void sbp2_update(struct fw_unit *unit) | |
1207 | { | |
5a3c2be6 SR |
1208 | struct sbp2_target *tgt = unit->device.driver_data; |
1209 | struct sbp2_logical_unit *lu; | |
9ba136d0 | 1210 | |
5a3c2be6 SR |
1211 | fw_device_enable_phys_dma(fw_device(unit->device.parent)); |
1212 | ||
1213 | /* | |
1214 | * Fw-core serializes sbp2_update() against sbp2_remove(). | |
1215 | * Iteration over tgt->lu_list is therefore safe here. | |
1216 | */ | |
1217 | list_for_each_entry(lu, &tgt->lu_list, link) { | |
2e2705bd | 1218 | sbp2_conditionally_block(lu); |
5a3c2be6 | 1219 | lu->retries = 0; |
285838eb | 1220 | sbp2_queue_work(lu, 0); |
5a3c2be6 | 1221 | } |
9ba136d0 KH |
1222 | } |
1223 | ||
1224 | #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e | |
1225 | #define SBP2_SW_VERSION_ENTRY 0x00010483 | |
1226 | ||
21ebcd12 | 1227 | static const struct fw_device_id sbp2_id_table[] = { |
9ba136d0 KH |
1228 | { |
1229 | .match_flags = FW_MATCH_SPECIFIER_ID | FW_MATCH_VERSION, | |
1230 | .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY, | |
5af4e5ea | 1231 | .version = SBP2_SW_VERSION_ENTRY, |
9ba136d0 KH |
1232 | }, |
1233 | { } | |
1234 | }; | |
1235 | ||
1236 | static struct fw_driver sbp2_driver = { | |
1237 | .driver = { | |
1238 | .owner = THIS_MODULE, | |
1239 | .name = sbp2_driver_name, | |
1240 | .bus = &fw_bus_type, | |
1241 | .probe = sbp2_probe, | |
1242 | .remove = sbp2_remove, | |
1243 | }, | |
1244 | .update = sbp2_update, | |
1245 | .id_table = sbp2_id_table, | |
1246 | }; | |
1247 | ||
fbb5423c KH |
1248 | static unsigned int |
1249 | sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data) | |
9ba136d0 | 1250 | { |
fbb5423c KH |
1251 | int sam_status; |
1252 | ||
9ba136d0 KH |
1253 | sense_data[0] = 0x70; |
1254 | sense_data[1] = 0x0; | |
1255 | sense_data[2] = sbp2_status[1]; | |
1256 | sense_data[3] = sbp2_status[4]; | |
1257 | sense_data[4] = sbp2_status[5]; | |
1258 | sense_data[5] = sbp2_status[6]; | |
1259 | sense_data[6] = sbp2_status[7]; | |
1260 | sense_data[7] = 10; | |
1261 | sense_data[8] = sbp2_status[8]; | |
1262 | sense_data[9] = sbp2_status[9]; | |
1263 | sense_data[10] = sbp2_status[10]; | |
1264 | sense_data[11] = sbp2_status[11]; | |
1265 | sense_data[12] = sbp2_status[2]; | |
1266 | sense_data[13] = sbp2_status[3]; | |
1267 | sense_data[14] = sbp2_status[12]; | |
1268 | sense_data[15] = sbp2_status[13]; | |
1269 | ||
fbb5423c | 1270 | sam_status = sbp2_status[0] & 0x3f; |
9ba136d0 | 1271 | |
fbb5423c KH |
1272 | switch (sam_status) { |
1273 | case SAM_STAT_GOOD: | |
9ba136d0 | 1274 | case SAM_STAT_CHECK_CONDITION: |
9ba136d0 | 1275 | case SAM_STAT_CONDITION_MET: |
fbb5423c | 1276 | case SAM_STAT_BUSY: |
9ba136d0 KH |
1277 | case SAM_STAT_RESERVATION_CONFLICT: |
1278 | case SAM_STAT_COMMAND_TERMINATED: | |
fbb5423c KH |
1279 | return DID_OK << 16 | sam_status; |
1280 | ||
9ba136d0 | 1281 | default: |
fbb5423c | 1282 | return DID_ERROR << 16; |
9ba136d0 KH |
1283 | } |
1284 | } | |
1285 | ||
1286 | static void | |
1287 | complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status) | |
1288 | { | |
6f061487 JF |
1289 | struct sbp2_command_orb *orb = |
1290 | container_of(base_orb, struct sbp2_command_orb, base); | |
5a3c2be6 | 1291 | struct fw_device *device = fw_device(orb->lu->tgt->unit->device.parent); |
9ba136d0 KH |
1292 | int result; |
1293 | ||
1294 | if (status != NULL) { | |
a77754a7 | 1295 | if (STATUS_GET_DEAD(*status)) |
e0e60215 | 1296 | sbp2_agent_reset_no_wait(orb->lu); |
9ba136d0 | 1297 | |
a77754a7 | 1298 | switch (STATUS_GET_RESPONSE(*status)) { |
9ba136d0 | 1299 | case SBP2_STATUS_REQUEST_COMPLETE: |
fbb5423c | 1300 | result = DID_OK << 16; |
9ba136d0 KH |
1301 | break; |
1302 | case SBP2_STATUS_TRANSPORT_FAILURE: | |
fbb5423c | 1303 | result = DID_BUS_BUSY << 16; |
9ba136d0 KH |
1304 | break; |
1305 | case SBP2_STATUS_ILLEGAL_REQUEST: | |
1306 | case SBP2_STATUS_VENDOR_DEPENDENT: | |
1307 | default: | |
fbb5423c | 1308 | result = DID_ERROR << 16; |
9ba136d0 KH |
1309 | break; |
1310 | } | |
1311 | ||
a77754a7 KH |
1312 | if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1) |
1313 | result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status), | |
9ba136d0 KH |
1314 | orb->cmd->sense_buffer); |
1315 | } else { | |
c781c06d KH |
1316 | /* |
1317 | * If the orb completes with status == NULL, something | |
9ba136d0 | 1318 | * went wrong, typically a bus reset happened mid-orb |
c781c06d KH |
1319 | * or when sending the write (less likely). |
1320 | */ | |
fbb5423c | 1321 | result = DID_BUS_BUSY << 16; |
2e2705bd | 1322 | sbp2_conditionally_block(orb->lu); |
9ba136d0 KH |
1323 | } |
1324 | ||
1325 | dma_unmap_single(device->card->device, orb->base.request_bus, | |
2d826cc5 | 1326 | sizeof(orb->request), DMA_TO_DEVICE); |
9ba136d0 | 1327 | |
412edf65 SR |
1328 | if (scsi_sg_count(orb->cmd) > 0) |
1329 | dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd), | |
1330 | scsi_sg_count(orb->cmd), | |
9ba136d0 | 1331 | orb->cmd->sc_data_direction); |
9ba136d0 KH |
1332 | |
1333 | if (orb->page_table_bus != 0) | |
1334 | dma_unmap_single(device->card->device, orb->page_table_bus, | |
b4be016a | 1335 | sizeof(orb->page_table), DMA_TO_DEVICE); |
9ba136d0 | 1336 | |
fbb5423c | 1337 | orb->cmd->result = result; |
9ba136d0 | 1338 | orb->done(orb->cmd); |
9ba136d0 KH |
1339 | } |
1340 | ||
5a3c2be6 SR |
1341 | static int |
1342 | sbp2_map_scatterlist(struct sbp2_command_orb *orb, struct fw_device *device, | |
1343 | struct sbp2_logical_unit *lu) | |
9ba136d0 | 1344 | { |
9ba136d0 KH |
1345 | struct scatterlist *sg; |
1346 | int sg_len, l, i, j, count; | |
9ba136d0 KH |
1347 | dma_addr_t sg_addr; |
1348 | ||
412edf65 SR |
1349 | sg = scsi_sglist(orb->cmd); |
1350 | count = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd), | |
9ba136d0 | 1351 | orb->cmd->sc_data_direction); |
95ffc5e3 KH |
1352 | if (count == 0) |
1353 | goto fail; | |
9ba136d0 | 1354 | |
c781c06d KH |
1355 | /* |
1356 | * Handle the special case where there is only one element in | |
9ba136d0 KH |
1357 | * the scatter list by converting it to an immediate block |
1358 | * request. This is also a workaround for broken devices such | |
1359 | * as the second generation iPod which doesn't support page | |
c781c06d KH |
1360 | * tables. |
1361 | */ | |
9ba136d0 | 1362 | if (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) { |
71ee9f01 SR |
1363 | orb->request.data_descriptor.high = |
1364 | cpu_to_be32(lu->tgt->address_high); | |
1365 | orb->request.data_descriptor.low = | |
1366 | cpu_to_be32(sg_dma_address(sg)); | |
1367 | orb->request.misc |= | |
1368 | cpu_to_be32(COMMAND_ORB_DATA_SIZE(sg_dma_len(sg))); | |
95ffc5e3 | 1369 | return 0; |
9ba136d0 KH |
1370 | } |
1371 | ||
c781c06d KH |
1372 | /* |
1373 | * Convert the scatterlist to an sbp2 page table. If any | |
36abb3b1 KHSR |
1374 | * scatterlist entries are too big for sbp2, we split them as we |
1375 | * go. Even if we ask the block I/O layer to not give us sg | |
1376 | * elements larger than 65535 bytes, some IOMMUs may merge sg elements | |
1377 | * during DMA mapping, and Linux currently doesn't prevent this. | |
c781c06d | 1378 | */ |
b7811da2 SR |
1379 | for (i = 0, j = 0; i < count; i++, sg = sg_next(sg)) { |
1380 | sg_len = sg_dma_len(sg); | |
1381 | sg_addr = sg_dma_address(sg); | |
9ba136d0 | 1382 | while (sg_len) { |
332ef331 SR |
1383 | /* FIXME: This won't get us out of the pinch. */ |
1384 | if (unlikely(j >= ARRAY_SIZE(orb->page_table))) { | |
1385 | fw_error("page table overflow\n"); | |
1386 | goto fail_page_table; | |
1387 | } | |
9ba136d0 | 1388 | l = min(sg_len, SBP2_MAX_SG_ELEMENT_LENGTH); |
71ee9f01 SR |
1389 | orb->page_table[j].low = cpu_to_be32(sg_addr); |
1390 | orb->page_table[j].high = cpu_to_be32(l << 16); | |
9ba136d0 KH |
1391 | sg_addr += l; |
1392 | sg_len -= l; | |
1393 | j++; | |
1394 | } | |
1395 | } | |
1396 | ||
b4be016a SR |
1397 | orb->page_table_bus = |
1398 | dma_map_single(device->card->device, orb->page_table, | |
1399 | sizeof(orb->page_table), DMA_TO_DEVICE); | |
1400 | if (dma_mapping_error(orb->page_table_bus)) | |
1401 | goto fail_page_table; | |
9ba136d0 | 1402 | |
c781c06d KH |
1403 | /* |
1404 | * The data_descriptor pointer is the one case where we need | |
9ba136d0 KH |
1405 | * to fill in the node ID part of the address. All other |
1406 | * pointers assume that the data referenced reside on the | |
1407 | * initiator (i.e. us), but data_descriptor can refer to data | |
c781c06d KH |
1408 | * on other nodes so we need to put our ID in descriptor.high. |
1409 | */ | |
71ee9f01 SR |
1410 | orb->request.data_descriptor.high = cpu_to_be32(lu->tgt->address_high); |
1411 | orb->request.data_descriptor.low = cpu_to_be32(orb->page_table_bus); | |
1412 | orb->request.misc |= cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT | | |
1413 | COMMAND_ORB_DATA_SIZE(j)); | |
9ba136d0 | 1414 | |
95ffc5e3 KH |
1415 | return 0; |
1416 | ||
1417 | fail_page_table: | |
412edf65 | 1418 | dma_unmap_sg(device->card->device, sg, scsi_sg_count(orb->cmd), |
95ffc5e3 KH |
1419 | orb->cmd->sc_data_direction); |
1420 | fail: | |
1421 | return -ENOMEM; | |
9ba136d0 KH |
1422 | } |
1423 | ||
9ba136d0 KH |
1424 | /* SCSI stack integration */ |
1425 | ||
1426 | static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done) | |
1427 | { | |
5a3c2be6 SR |
1428 | struct sbp2_logical_unit *lu = cmd->device->hostdata; |
1429 | struct fw_device *device = fw_device(lu->tgt->unit->device.parent); | |
9ba136d0 | 1430 | struct sbp2_command_orb *orb; |
05cca738 | 1431 | unsigned int max_payload; |
5a3c2be6 | 1432 | int retval = SCSI_MLQUEUE_HOST_BUSY; |
9ba136d0 | 1433 | |
c781c06d KH |
1434 | /* |
1435 | * Bidirectional commands are not yet implemented, and unknown | |
1436 | * transfer direction not handled. | |
1437 | */ | |
9ba136d0 | 1438 | if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) { |
8a8cea27 | 1439 | fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n"); |
e1b68c4d KH |
1440 | cmd->result = DID_ERROR << 16; |
1441 | done(cmd); | |
1442 | return 0; | |
9ba136d0 KH |
1443 | } |
1444 | ||
2d826cc5 | 1445 | orb = kzalloc(sizeof(*orb), GFP_ATOMIC); |
9ba136d0 KH |
1446 | if (orb == NULL) { |
1447 | fw_notify("failed to alloc orb\n"); | |
5a3c2be6 | 1448 | return SCSI_MLQUEUE_HOST_BUSY; |
9ba136d0 KH |
1449 | } |
1450 | ||
12f26aa1 KH |
1451 | /* Initialize rcode to something not RCODE_COMPLETE. */ |
1452 | orb->base.rcode = -1; | |
e57d2011 | 1453 | kref_init(&orb->base.kref); |
9ba136d0 | 1454 | |
5a3c2be6 | 1455 | orb->lu = lu; |
9ba136d0 KH |
1456 | orb->done = done; |
1457 | orb->cmd = cmd; | |
1458 | ||
71ee9f01 | 1459 | orb->request.next.high = cpu_to_be32(SBP2_ORB_NULL); |
9ba136d0 | 1460 | orb->request.next.low = 0x0; |
c781c06d KH |
1461 | /* |
1462 | * At speed 100 we can do 512 bytes per packet, at speed 200, | |
9ba136d0 KH |
1463 | * 1024 bytes per packet etc. The SBP-2 max_payload field |
1464 | * specifies the max payload size as 2 ^ (max_payload + 2), so | |
c781c06d KH |
1465 | * if we set this to max_speed + 7, we get the right value. |
1466 | */ | |
25659f71 SR |
1467 | max_payload = min(device->max_speed + 7, |
1468 | device->card->max_receive - 1); | |
71ee9f01 | 1469 | orb->request.misc = cpu_to_be32( |
25659f71 | 1470 | COMMAND_ORB_MAX_PAYLOAD(max_payload) | |
f1397490 | 1471 | COMMAND_ORB_SPEED(device->max_speed) | |
71ee9f01 | 1472 | COMMAND_ORB_NOTIFY); |
9ba136d0 KH |
1473 | |
1474 | if (cmd->sc_data_direction == DMA_FROM_DEVICE) | |
71ee9f01 SR |
1475 | orb->request.misc |= cpu_to_be32( |
1476 | COMMAND_ORB_DIRECTION(SBP2_DIRECTION_FROM_MEDIA)); | |
9ba136d0 | 1477 | else if (cmd->sc_data_direction == DMA_TO_DEVICE) |
71ee9f01 SR |
1478 | orb->request.misc |= cpu_to_be32( |
1479 | COMMAND_ORB_DIRECTION(SBP2_DIRECTION_TO_MEDIA)); | |
9ba136d0 | 1480 | |
5a3c2be6 SR |
1481 | if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0) |
1482 | goto out; | |
9ba136d0 | 1483 | |
9ba136d0 | 1484 | memset(orb->request.command_block, |
2d826cc5 | 1485 | 0, sizeof(orb->request.command_block)); |
9ba136d0 KH |
1486 | memcpy(orb->request.command_block, cmd->cmnd, COMMAND_SIZE(*cmd->cmnd)); |
1487 | ||
1488 | orb->base.callback = complete_command_orb; | |
8526392a SR |
1489 | orb->base.request_bus = |
1490 | dma_map_single(device->card->device, &orb->request, | |
1491 | sizeof(orb->request), DMA_TO_DEVICE); | |
1492 | if (dma_mapping_error(orb->base.request_bus)) | |
5a3c2be6 | 1493 | goto out; |
82eff9db | 1494 | |
5a3c2be6 SR |
1495 | sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, lu->generation, |
1496 | lu->command_block_agent_address + SBP2_ORB_POINTER); | |
1497 | retval = 0; | |
1498 | out: | |
e57d2011 | 1499 | kref_put(&orb->base.kref, free_orb); |
5a3c2be6 | 1500 | return retval; |
9ba136d0 KH |
1501 | } |
1502 | ||
cfb01381 SR |
1503 | static int sbp2_scsi_slave_alloc(struct scsi_device *sdev) |
1504 | { | |
5a3c2be6 | 1505 | struct sbp2_logical_unit *lu = sdev->hostdata; |
cfb01381 | 1506 | |
5513c5f6 SR |
1507 | /* (Re-)Adding logical units via the SCSI stack is not supported. */ |
1508 | if (!lu) | |
1509 | return -ENOSYS; | |
1510 | ||
cfb01381 SR |
1511 | sdev->allow_restart = 1; |
1512 | ||
8ac3a47c SR |
1513 | /* SBP-2 requires quadlet alignment of the data buffers. */ |
1514 | blk_queue_update_dma_alignment(sdev->request_queue, 4 - 1); | |
465ff318 | 1515 | |
5a3c2be6 | 1516 | if (lu->tgt->workarounds & SBP2_WORKAROUND_INQUIRY_36) |
cfb01381 | 1517 | sdev->inquiry_len = 36; |
5a3c2be6 | 1518 | |
cfb01381 SR |
1519 | return 0; |
1520 | } | |
1521 | ||
9ba136d0 KH |
1522 | static int sbp2_scsi_slave_configure(struct scsi_device *sdev) |
1523 | { | |
5a3c2be6 | 1524 | struct sbp2_logical_unit *lu = sdev->hostdata; |
9ba136d0 | 1525 | |
cfb01381 SR |
1526 | sdev->use_10_for_rw = 1; |
1527 | ||
1528 | if (sdev->type == TYPE_ROM) | |
1529 | sdev->use_10_for_ms = 1; | |
5a3c2be6 | 1530 | |
9ba136d0 | 1531 | if (sdev->type == TYPE_DISK && |
5a3c2be6 | 1532 | lu->tgt->workarounds & SBP2_WORKAROUND_MODE_SENSE_8) |
9ba136d0 | 1533 | sdev->skip_ms_page_8 = 1; |
5a3c2be6 SR |
1534 | |
1535 | if (lu->tgt->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) | |
9ba136d0 | 1536 | sdev->fix_capacity = 1; |
5a3c2be6 SR |
1537 | |
1538 | if (lu->tgt->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS) | |
cf47c7a2 | 1539 | blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512); |
5a3c2be6 | 1540 | |
9ba136d0 KH |
1541 | return 0; |
1542 | } | |
1543 | ||
1544 | /* | |
1545 | * Called by scsi stack when something has really gone wrong. Usually | |
1546 | * called when a command has timed-out for some reason. | |
1547 | */ | |
1548 | static int sbp2_scsi_abort(struct scsi_cmnd *cmd) | |
1549 | { | |
5a3c2be6 | 1550 | struct sbp2_logical_unit *lu = cmd->device->hostdata; |
9ba136d0 | 1551 | |
48f18c76 | 1552 | fw_notify("%s: sbp2_scsi_abort\n", lu->tgt->bus_id); |
5a3c2be6 SR |
1553 | sbp2_agent_reset(lu); |
1554 | sbp2_cancel_orbs(lu); | |
9ba136d0 KH |
1555 | |
1556 | return SUCCESS; | |
1557 | } | |
1558 | ||
14e21986 SR |
1559 | /* |
1560 | * Format of /sys/bus/scsi/devices/.../ieee1394_id: | |
1561 | * u64 EUI-64 : u24 directory_ID : u16 LUN (all printed in hexadecimal) | |
1562 | * | |
1563 | * This is the concatenation of target port identifier and logical unit | |
1564 | * identifier as per SAM-2...SAM-4 annex A. | |
1565 | */ | |
1566 | static ssize_t | |
1567 | sbp2_sysfs_ieee1394_id_show(struct device *dev, struct device_attribute *attr, | |
1568 | char *buf) | |
1569 | { | |
1570 | struct scsi_device *sdev = to_scsi_device(dev); | |
5a3c2be6 | 1571 | struct sbp2_logical_unit *lu; |
14e21986 | 1572 | struct fw_device *device; |
14e21986 SR |
1573 | |
1574 | if (!sdev) | |
1575 | return 0; | |
14e21986 | 1576 | |
5a3c2be6 SR |
1577 | lu = sdev->hostdata; |
1578 | device = fw_device(lu->tgt->unit->device.parent); | |
14e21986 SR |
1579 | |
1580 | return sprintf(buf, "%08x%08x:%06x:%04x\n", | |
1581 | device->config_rom[3], device->config_rom[4], | |
5a3c2be6 | 1582 | lu->tgt->directory_id, lu->lun); |
14e21986 SR |
1583 | } |
1584 | ||
1585 | static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL); | |
1586 | ||
1587 | static struct device_attribute *sbp2_scsi_sysfs_attrs[] = { | |
1588 | &dev_attr_ieee1394_id, | |
1589 | NULL | |
1590 | }; | |
1591 | ||
9ba136d0 KH |
1592 | static struct scsi_host_template scsi_driver_template = { |
1593 | .module = THIS_MODULE, | |
1594 | .name = "SBP-2 IEEE-1394", | |
b02b6bc4 | 1595 | .proc_name = sbp2_driver_name, |
9ba136d0 | 1596 | .queuecommand = sbp2_scsi_queuecommand, |
cfb01381 | 1597 | .slave_alloc = sbp2_scsi_slave_alloc, |
9ba136d0 KH |
1598 | .slave_configure = sbp2_scsi_slave_configure, |
1599 | .eh_abort_handler = sbp2_scsi_abort, | |
1600 | .this_id = -1, | |
1601 | .sg_tablesize = SG_ALL, | |
1602 | .use_clustering = ENABLE_CLUSTERING, | |
02af8e70 SR |
1603 | .cmd_per_lun = 1, |
1604 | .can_queue = 1, | |
14e21986 | 1605 | .sdev_attrs = sbp2_scsi_sysfs_attrs, |
9ba136d0 KH |
1606 | }; |
1607 | ||
9ba136d0 KH |
1608 | MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>"); |
1609 | MODULE_DESCRIPTION("SCSI over IEEE1394"); | |
1610 | MODULE_LICENSE("GPL"); | |
1611 | MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table); | |
1612 | ||
1e4c7b0d OH |
1613 | /* Provide a module alias so root-on-sbp2 initrds don't break. */ |
1614 | #ifndef CONFIG_IEEE1394_SBP2_MODULE | |
1615 | MODULE_ALIAS("sbp2"); | |
1616 | #endif | |
1617 | ||
9ba136d0 KH |
1618 | static int __init sbp2_init(void) |
1619 | { | |
df8ec249 SR |
1620 | sbp2_wq = create_singlethread_workqueue(KBUILD_MODNAME); |
1621 | if (!sbp2_wq) | |
1622 | return -ENOMEM; | |
1623 | ||
9ba136d0 KH |
1624 | return driver_register(&sbp2_driver.driver); |
1625 | } | |
1626 | ||
1627 | static void __exit sbp2_cleanup(void) | |
1628 | { | |
1629 | driver_unregister(&sbp2_driver.driver); | |
df8ec249 | 1630 | destroy_workqueue(sbp2_wq); |
9ba136d0 KH |
1631 | } |
1632 | ||
1633 | module_init(sbp2_init); | |
1634 | module_exit(sbp2_cleanup); |