2 * SBP2 driver (SCSI over IEEE1394)
4 * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
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.
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.
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.
22 * The basic structure of this driver is based on the old storage driver,
23 * drivers/ieee1394/sbp2.c, originally written by
24 * James Goodwin <jamesg@filanet.com>
25 * with later contributions and ongoing maintenance from
26 * Ben Collins <bcollins@debian.org>,
27 * Stefan Richter <stefanr@s5r6.in-berlin.de>
31 #include <linux/blkdev.h>
32 #include <linux/bug.h>
33 #include <linux/delay.h>
34 #include <linux/device.h>
35 #include <linux/dma-mapping.h>
36 #include <linux/kernel.h>
37 #include <linux/mod_devicetable.h>
38 #include <linux/module.h>
39 #include <linux/moduleparam.h>
40 #include <linux/scatterlist.h>
41 #include <linux/string.h>
42 #include <linux/stringify.h>
43 #include <linux/timer.h>
44 #include <linux/workqueue.h>
45 #include <asm/system.h>
47 #include <scsi/scsi.h>
48 #include <scsi/scsi_cmnd.h>
49 #include <scsi/scsi_device.h>
50 #include <scsi/scsi_host.h>
52 #include "fw-device.h"
53 #include "fw-topology.h"
54 #include "fw-transaction.h"
57 * So far only bridges from Oxford Semiconductor are known to support
58 * concurrent logins. Depending on firmware, four or two concurrent logins
59 * are possible on OXFW911 and newer Oxsemi bridges.
61 * Concurrent logins are useful together with cluster filesystems.
63 static int sbp2_param_exclusive_login
= 1;
64 module_param_named(exclusive_login
, sbp2_param_exclusive_login
, bool, 0644);
65 MODULE_PARM_DESC(exclusive_login
, "Exclusive login to sbp2 device "
66 "(default = Y, use N for concurrent initiators)");
69 * Flags for firmware oddities
71 * - 128kB max transfer
72 * Limit transfer size. Necessary for some old bridges.
75 * When scsi_mod probes the device, let the inquiry command look like that
79 * Suppress sending of mode_sense for mode page 8 if the device pretends to
80 * support the SCSI Primary Block commands instead of Reduced Block Commands.
83 * Tell sd_mod to correct the last sector number reported by read_capacity.
84 * Avoids access beyond actual disk limits on devices with an off-by-one bug.
85 * Don't use this with devices which don't have this bug.
88 * Wait extra SBP2_INQUIRY_DELAY seconds after login before SCSI inquiry.
91 * Set the power condition field in the START STOP UNIT commands sent by
92 * sd_mod on suspend, resume, and shutdown (if manage_start_stop is on).
93 * Some disks need this to spin down or to resume properly.
95 * - override internal blacklist
96 * Instead of adding to the built-in blacklist, use only the workarounds
97 * specified in the module load parameter.
98 * Useful if a blacklist entry interfered with a non-broken device.
100 #define SBP2_WORKAROUND_128K_MAX_TRANS 0x1
101 #define SBP2_WORKAROUND_INQUIRY_36 0x2
102 #define SBP2_WORKAROUND_MODE_SENSE_8 0x4
103 #define SBP2_WORKAROUND_FIX_CAPACITY 0x8
104 #define SBP2_WORKAROUND_DELAY_INQUIRY 0x10
105 #define SBP2_INQUIRY_DELAY 12
106 #define SBP2_WORKAROUND_POWER_CONDITION 0x20
107 #define SBP2_WORKAROUND_OVERRIDE 0x100
109 static int sbp2_param_workarounds
;
110 module_param_named(workarounds
, sbp2_param_workarounds
, int, 0644);
111 MODULE_PARM_DESC(workarounds
, "Work around device bugs (default = 0"
112 ", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS
)
113 ", 36 byte inquiry = " __stringify(SBP2_WORKAROUND_INQUIRY_36
)
114 ", skip mode page 8 = " __stringify(SBP2_WORKAROUND_MODE_SENSE_8
)
115 ", fix capacity = " __stringify(SBP2_WORKAROUND_FIX_CAPACITY
)
116 ", delay inquiry = " __stringify(SBP2_WORKAROUND_DELAY_INQUIRY
)
117 ", set power condition in start stop unit = "
118 __stringify(SBP2_WORKAROUND_POWER_CONDITION
)
119 ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE
)
120 ", or a combination)");
122 /* I don't know why the SCSI stack doesn't define something like this... */
123 typedef void (*scsi_done_fn_t
)(struct scsi_cmnd
*);
125 static const char sbp2_driver_name
[] = "sbp2";
128 * We create one struct sbp2_logical_unit per SBP-2 Logical Unit Number Entry
129 * and one struct scsi_device per sbp2_logical_unit.
131 struct sbp2_logical_unit
{
132 struct sbp2_target
*tgt
;
133 struct list_head link
;
134 struct fw_address_handler address_handler
;
135 struct list_head orb_list
;
137 u64 command_block_agent_address
;
142 * The generation is updated once we've logged in or reconnected
143 * to the logical unit. Thus, I/O to the device will automatically
144 * fail and get retried if it happens in a window where the device
145 * is not ready, e.g. after a bus reset but before we reconnect.
149 struct delayed_work work
;
155 * We create one struct sbp2_target per IEEE 1212 Unit Directory
156 * and one struct Scsi_Host per sbp2_target.
160 struct fw_unit
*unit
;
162 struct list_head lu_list
;
164 u64 management_agent_address
;
169 unsigned int workarounds
;
170 unsigned int mgt_orb_timeout
;
172 int dont_block
; /* counter for each logical unit */
173 int blocked
; /* ditto */
176 /* Impossible login_id, to detect logout attempt before successful login */
177 #define INVALID_LOGIN_ID 0x10000
180 * Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be
181 * provided in the config rom. Most devices do provide a value, which
182 * we'll use for login management orbs, but with some sane limits.
184 #define SBP2_MIN_LOGIN_ORB_TIMEOUT 5000U /* Timeout in ms */
185 #define SBP2_MAX_LOGIN_ORB_TIMEOUT 40000U /* Timeout in ms */
186 #define SBP2_ORB_TIMEOUT 2000U /* Timeout in ms */
187 #define SBP2_ORB_NULL 0x80000000
188 #define SBP2_RETRY_LIMIT 0xf /* 15 retries */
189 #define SBP2_CYCLE_LIMIT (0xc8 << 12) /* 200 125us cycles */
192 * The default maximum s/g segment size of a FireWire controller is
193 * usually 0x10000, but SBP-2 only allows 0xffff. Since buffers have to
194 * be quadlet-aligned, we set the length limit to 0xffff & ~3.
196 #define SBP2_MAX_SEG_SIZE 0xfffc
198 /* Unit directory keys */
199 #define SBP2_CSR_UNIT_CHARACTERISTICS 0x3a
200 #define SBP2_CSR_FIRMWARE_REVISION 0x3c
201 #define SBP2_CSR_LOGICAL_UNIT_NUMBER 0x14
202 #define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4
204 /* Management orb opcodes */
205 #define SBP2_LOGIN_REQUEST 0x0
206 #define SBP2_QUERY_LOGINS_REQUEST 0x1
207 #define SBP2_RECONNECT_REQUEST 0x3
208 #define SBP2_SET_PASSWORD_REQUEST 0x4
209 #define SBP2_LOGOUT_REQUEST 0x7
210 #define SBP2_ABORT_TASK_REQUEST 0xb
211 #define SBP2_ABORT_TASK_SET 0xc
212 #define SBP2_LOGICAL_UNIT_RESET 0xe
213 #define SBP2_TARGET_RESET_REQUEST 0xf
215 /* Offsets for command block agent registers */
216 #define SBP2_AGENT_STATE 0x00
217 #define SBP2_AGENT_RESET 0x04
218 #define SBP2_ORB_POINTER 0x08
219 #define SBP2_DOORBELL 0x10
220 #define SBP2_UNSOLICITED_STATUS_ENABLE 0x14
222 /* Status write response codes */
223 #define SBP2_STATUS_REQUEST_COMPLETE 0x0
224 #define SBP2_STATUS_TRANSPORT_FAILURE 0x1
225 #define SBP2_STATUS_ILLEGAL_REQUEST 0x2
226 #define SBP2_STATUS_VENDOR_DEPENDENT 0x3
228 #define STATUS_GET_ORB_HIGH(v) ((v).status & 0xffff)
229 #define STATUS_GET_SBP_STATUS(v) (((v).status >> 16) & 0xff)
230 #define STATUS_GET_LEN(v) (((v).status >> 24) & 0x07)
231 #define STATUS_GET_DEAD(v) (((v).status >> 27) & 0x01)
232 #define STATUS_GET_RESPONSE(v) (((v).status >> 28) & 0x03)
233 #define STATUS_GET_SOURCE(v) (((v).status >> 30) & 0x03)
234 #define STATUS_GET_ORB_LOW(v) ((v).orb_low)
235 #define STATUS_GET_DATA(v) ((v).data)
243 struct sbp2_pointer
{
249 struct fw_transaction t
;
251 dma_addr_t request_bus
;
253 struct sbp2_pointer pointer
;
254 void (*callback
)(struct sbp2_orb
* orb
, struct sbp2_status
* status
);
255 struct list_head link
;
258 #define MANAGEMENT_ORB_LUN(v) ((v))
259 #define MANAGEMENT_ORB_FUNCTION(v) ((v) << 16)
260 #define MANAGEMENT_ORB_RECONNECT(v) ((v) << 20)
261 #define MANAGEMENT_ORB_EXCLUSIVE(v) ((v) ? 1 << 28 : 0)
262 #define MANAGEMENT_ORB_REQUEST_FORMAT(v) ((v) << 29)
263 #define MANAGEMENT_ORB_NOTIFY ((1) << 31)
265 #define MANAGEMENT_ORB_RESPONSE_LENGTH(v) ((v))
266 #define MANAGEMENT_ORB_PASSWORD_LENGTH(v) ((v) << 16)
268 struct sbp2_management_orb
{
269 struct sbp2_orb base
;
271 struct sbp2_pointer password
;
272 struct sbp2_pointer response
;
275 struct sbp2_pointer status_fifo
;
278 dma_addr_t response_bus
;
279 struct completion done
;
280 struct sbp2_status status
;
283 struct sbp2_login_response
{
285 struct sbp2_pointer command_block_agent
;
286 __be32 reconnect_hold
;
288 #define COMMAND_ORB_DATA_SIZE(v) ((v))
289 #define COMMAND_ORB_PAGE_SIZE(v) ((v) << 16)
290 #define COMMAND_ORB_PAGE_TABLE_PRESENT ((1) << 19)
291 #define COMMAND_ORB_MAX_PAYLOAD(v) ((v) << 20)
292 #define COMMAND_ORB_SPEED(v) ((v) << 24)
293 #define COMMAND_ORB_DIRECTION ((1) << 27)
294 #define COMMAND_ORB_REQUEST_FORMAT(v) ((v) << 29)
295 #define COMMAND_ORB_NOTIFY ((1) << 31)
297 struct sbp2_command_orb
{
298 struct sbp2_orb base
;
300 struct sbp2_pointer next
;
301 struct sbp2_pointer data_descriptor
;
303 u8 command_block
[12];
305 struct scsi_cmnd
*cmd
;
307 struct sbp2_logical_unit
*lu
;
309 struct sbp2_pointer page_table
[SG_ALL
] __attribute__((aligned(8)));
310 dma_addr_t page_table_bus
;
314 * List of devices with known bugs.
316 * The firmware_revision field, masked with 0xffff00, is the best
317 * indicator for the type of bridge chip of a device. It yields a few
318 * false positives but this did not break correctly behaving devices
319 * so far. We use ~0 as a wildcard, since the 24 bit values we get
320 * from the config rom can never match that.
322 static const struct {
323 u32 firmware_revision
;
325 unsigned int workarounds
;
326 } sbp2_workarounds_table
[] = {
327 /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
328 .firmware_revision
= 0x002800,
330 .workarounds
= SBP2_WORKAROUND_INQUIRY_36
|
331 SBP2_WORKAROUND_MODE_SENSE_8
|
332 SBP2_WORKAROUND_POWER_CONDITION
,
334 /* DViCO Momobay FX-3A with TSB42AA9A bridge */ {
335 .firmware_revision
= 0x002800,
337 .workarounds
= SBP2_WORKAROUND_DELAY_INQUIRY
|
338 SBP2_WORKAROUND_POWER_CONDITION
,
340 /* Initio bridges, actually only needed for some older ones */ {
341 .firmware_revision
= 0x000200,
343 .workarounds
= SBP2_WORKAROUND_INQUIRY_36
,
345 /* PL-3507 bridge with Prolific firmware */ {
346 .firmware_revision
= 0x012800,
348 .workarounds
= SBP2_WORKAROUND_POWER_CONDITION
,
350 /* Symbios bridge */ {
351 .firmware_revision
= 0xa0b800,
353 .workarounds
= SBP2_WORKAROUND_128K_MAX_TRANS
,
355 /* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ {
356 .firmware_revision
= 0x002600,
358 .workarounds
= SBP2_WORKAROUND_128K_MAX_TRANS
,
362 * There are iPods (2nd gen, 3rd gen) with model_id == 0, but
363 * these iPods do not feature the read_capacity bug according
364 * to one report. Read_capacity behaviour as well as model_id
365 * could change due to Apple-supplied firmware updates though.
368 /* iPod 4th generation. */ {
369 .firmware_revision
= 0x0a2700,
371 .workarounds
= SBP2_WORKAROUND_FIX_CAPACITY
,
374 .firmware_revision
= 0x0a2700,
376 .workarounds
= SBP2_WORKAROUND_FIX_CAPACITY
,
379 .firmware_revision
= 0x0a2700,
381 .workarounds
= SBP2_WORKAROUND_FIX_CAPACITY
,
384 .firmware_revision
= 0x0a2700,
386 .workarounds
= SBP2_WORKAROUND_FIX_CAPACITY
,
391 free_orb(struct kref
*kref
)
393 struct sbp2_orb
*orb
= container_of(kref
, struct sbp2_orb
, kref
);
399 sbp2_status_write(struct fw_card
*card
, struct fw_request
*request
,
400 int tcode
, int destination
, int source
,
401 int generation
, int speed
,
402 unsigned long long offset
,
403 void *payload
, size_t length
, void *callback_data
)
405 struct sbp2_logical_unit
*lu
= callback_data
;
406 struct sbp2_orb
*orb
;
407 struct sbp2_status status
;
411 if (tcode
!= TCODE_WRITE_BLOCK_REQUEST
||
412 length
== 0 || length
> sizeof(status
)) {
413 fw_send_response(card
, request
, RCODE_TYPE_ERROR
);
417 header_size
= min(length
, 2 * sizeof(u32
));
418 fw_memcpy_from_be32(&status
, payload
, header_size
);
419 if (length
> header_size
)
420 memcpy(status
.data
, payload
+ 8, length
- header_size
);
421 if (STATUS_GET_SOURCE(status
) == 2 || STATUS_GET_SOURCE(status
) == 3) {
422 fw_notify("non-orb related status write, not handled\n");
423 fw_send_response(card
, request
, RCODE_COMPLETE
);
427 /* Lookup the orb corresponding to this status write. */
428 spin_lock_irqsave(&card
->lock
, flags
);
429 list_for_each_entry(orb
, &lu
->orb_list
, link
) {
430 if (STATUS_GET_ORB_HIGH(status
) == 0 &&
431 STATUS_GET_ORB_LOW(status
) == orb
->request_bus
) {
432 orb
->rcode
= RCODE_COMPLETE
;
433 list_del(&orb
->link
);
437 spin_unlock_irqrestore(&card
->lock
, flags
);
439 if (&orb
->link
!= &lu
->orb_list
)
440 orb
->callback(orb
, &status
);
442 fw_error("status write for unknown orb\n");
444 kref_put(&orb
->kref
, free_orb
);
446 fw_send_response(card
, request
, RCODE_COMPLETE
);
450 complete_transaction(struct fw_card
*card
, int rcode
,
451 void *payload
, size_t length
, void *data
)
453 struct sbp2_orb
*orb
= data
;
457 * This is a little tricky. We can get the status write for
458 * the orb before we get this callback. The status write
459 * handler above will assume the orb pointer transaction was
460 * successful and set the rcode to RCODE_COMPLETE for the orb.
461 * So this callback only sets the rcode if it hasn't already
462 * been set and only does the cleanup if the transaction
463 * failed and we didn't already get a status write.
465 spin_lock_irqsave(&card
->lock
, flags
);
467 if (orb
->rcode
== -1)
469 if (orb
->rcode
!= RCODE_COMPLETE
) {
470 list_del(&orb
->link
);
471 spin_unlock_irqrestore(&card
->lock
, flags
);
472 orb
->callback(orb
, NULL
);
474 spin_unlock_irqrestore(&card
->lock
, flags
);
477 kref_put(&orb
->kref
, free_orb
);
481 sbp2_send_orb(struct sbp2_orb
*orb
, struct sbp2_logical_unit
*lu
,
482 int node_id
, int generation
, u64 offset
)
484 struct fw_device
*device
= fw_device(lu
->tgt
->unit
->device
.parent
);
487 orb
->pointer
.high
= 0;
488 orb
->pointer
.low
= cpu_to_be32(orb
->request_bus
);
490 spin_lock_irqsave(&device
->card
->lock
, flags
);
491 list_add_tail(&orb
->link
, &lu
->orb_list
);
492 spin_unlock_irqrestore(&device
->card
->lock
, flags
);
494 /* Take a ref for the orb list and for the transaction callback. */
495 kref_get(&orb
->kref
);
496 kref_get(&orb
->kref
);
498 fw_send_request(device
->card
, &orb
->t
, TCODE_WRITE_BLOCK_REQUEST
,
499 node_id
, generation
, device
->max_speed
, offset
,
500 &orb
->pointer
, sizeof(orb
->pointer
),
501 complete_transaction
, orb
);
504 static int sbp2_cancel_orbs(struct sbp2_logical_unit
*lu
)
506 struct fw_device
*device
= fw_device(lu
->tgt
->unit
->device
.parent
);
507 struct sbp2_orb
*orb
, *next
;
508 struct list_head list
;
510 int retval
= -ENOENT
;
512 INIT_LIST_HEAD(&list
);
513 spin_lock_irqsave(&device
->card
->lock
, flags
);
514 list_splice_init(&lu
->orb_list
, &list
);
515 spin_unlock_irqrestore(&device
->card
->lock
, flags
);
517 list_for_each_entry_safe(orb
, next
, &list
, link
) {
519 if (fw_cancel_transaction(device
->card
, &orb
->t
) == 0)
522 orb
->rcode
= RCODE_CANCELLED
;
523 orb
->callback(orb
, NULL
);
530 complete_management_orb(struct sbp2_orb
*base_orb
, struct sbp2_status
*status
)
532 struct sbp2_management_orb
*orb
=
533 container_of(base_orb
, struct sbp2_management_orb
, base
);
536 memcpy(&orb
->status
, status
, sizeof(*status
));
537 complete(&orb
->done
);
541 sbp2_send_management_orb(struct sbp2_logical_unit
*lu
, int node_id
,
542 int generation
, int function
, int lun_or_login_id
,
545 struct fw_device
*device
= fw_device(lu
->tgt
->unit
->device
.parent
);
546 struct sbp2_management_orb
*orb
;
547 unsigned int timeout
;
548 int retval
= -ENOMEM
;
550 if (function
== SBP2_LOGOUT_REQUEST
&& fw_device_is_shutdown(device
))
553 orb
= kzalloc(sizeof(*orb
), GFP_ATOMIC
);
557 kref_init(&orb
->base
.kref
);
559 dma_map_single(device
->card
->device
, &orb
->response
,
560 sizeof(orb
->response
), DMA_FROM_DEVICE
);
561 if (dma_mapping_error(device
->card
->device
, orb
->response_bus
))
562 goto fail_mapping_response
;
564 orb
->request
.response
.high
= 0;
565 orb
->request
.response
.low
= cpu_to_be32(orb
->response_bus
);
567 orb
->request
.misc
= cpu_to_be32(
568 MANAGEMENT_ORB_NOTIFY
|
569 MANAGEMENT_ORB_FUNCTION(function
) |
570 MANAGEMENT_ORB_LUN(lun_or_login_id
));
571 orb
->request
.length
= cpu_to_be32(
572 MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb
->response
)));
574 orb
->request
.status_fifo
.high
=
575 cpu_to_be32(lu
->address_handler
.offset
>> 32);
576 orb
->request
.status_fifo
.low
=
577 cpu_to_be32(lu
->address_handler
.offset
);
579 if (function
== SBP2_LOGIN_REQUEST
) {
580 /* Ask for 2^2 == 4 seconds reconnect grace period */
581 orb
->request
.misc
|= cpu_to_be32(
582 MANAGEMENT_ORB_RECONNECT(2) |
583 MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login
));
584 timeout
= lu
->tgt
->mgt_orb_timeout
;
586 timeout
= SBP2_ORB_TIMEOUT
;
589 init_completion(&orb
->done
);
590 orb
->base
.callback
= complete_management_orb
;
592 orb
->base
.request_bus
=
593 dma_map_single(device
->card
->device
, &orb
->request
,
594 sizeof(orb
->request
), DMA_TO_DEVICE
);
595 if (dma_mapping_error(device
->card
->device
, orb
->base
.request_bus
))
596 goto fail_mapping_request
;
598 sbp2_send_orb(&orb
->base
, lu
, node_id
, generation
,
599 lu
->tgt
->management_agent_address
);
601 wait_for_completion_timeout(&orb
->done
, msecs_to_jiffies(timeout
));
604 if (sbp2_cancel_orbs(lu
) == 0) {
605 fw_error("%s: orb reply timed out, rcode=0x%02x\n",
606 lu
->tgt
->bus_id
, orb
->base
.rcode
);
610 if (orb
->base
.rcode
!= RCODE_COMPLETE
) {
611 fw_error("%s: management write failed, rcode 0x%02x\n",
612 lu
->tgt
->bus_id
, orb
->base
.rcode
);
616 if (STATUS_GET_RESPONSE(orb
->status
) != 0 ||
617 STATUS_GET_SBP_STATUS(orb
->status
) != 0) {
618 fw_error("%s: error status: %d:%d\n", lu
->tgt
->bus_id
,
619 STATUS_GET_RESPONSE(orb
->status
),
620 STATUS_GET_SBP_STATUS(orb
->status
));
626 dma_unmap_single(device
->card
->device
, orb
->base
.request_bus
,
627 sizeof(orb
->request
), DMA_TO_DEVICE
);
628 fail_mapping_request
:
629 dma_unmap_single(device
->card
->device
, orb
->response_bus
,
630 sizeof(orb
->response
), DMA_FROM_DEVICE
);
631 fail_mapping_response
:
633 memcpy(response
, orb
->response
, sizeof(orb
->response
));
634 kref_put(&orb
->base
.kref
, free_orb
);
639 static void sbp2_agent_reset(struct sbp2_logical_unit
*lu
)
641 struct fw_device
*device
= fw_device(lu
->tgt
->unit
->device
.parent
);
644 fw_run_transaction(device
->card
, TCODE_WRITE_QUADLET_REQUEST
,
645 lu
->tgt
->node_id
, lu
->generation
, device
->max_speed
,
646 lu
->command_block_agent_address
+ SBP2_AGENT_RESET
,
651 complete_agent_reset_write_no_wait(struct fw_card
*card
, int rcode
,
652 void *payload
, size_t length
, void *data
)
657 static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit
*lu
)
659 struct fw_device
*device
= fw_device(lu
->tgt
->unit
->device
.parent
);
660 struct fw_transaction
*t
;
663 t
= kmalloc(sizeof(*t
), GFP_ATOMIC
);
667 fw_send_request(device
->card
, t
, TCODE_WRITE_QUADLET_REQUEST
,
668 lu
->tgt
->node_id
, lu
->generation
, device
->max_speed
,
669 lu
->command_block_agent_address
+ SBP2_AGENT_RESET
,
670 &d
, sizeof(d
), complete_agent_reset_write_no_wait
, t
);
673 static inline void sbp2_allow_block(struct sbp2_logical_unit
*lu
)
676 * We may access dont_block without taking card->lock here:
677 * All callers of sbp2_allow_block() and all callers of sbp2_unblock()
678 * are currently serialized against each other.
679 * And a wrong result in sbp2_conditionally_block()'s access of
680 * dont_block is rather harmless, it simply misses its first chance.
682 --lu
->tgt
->dont_block
;
686 * Blocks lu->tgt if all of the following conditions are met:
687 * - Login, INQUIRY, and high-level SCSI setup of all of the target's
688 * logical units have been finished (indicated by dont_block == 0).
689 * - lu->generation is stale.
691 * Note, scsi_block_requests() must be called while holding card->lock,
692 * otherwise it might foil sbp2_[conditionally_]unblock()'s attempt to
693 * unblock the target.
695 static void sbp2_conditionally_block(struct sbp2_logical_unit
*lu
)
697 struct sbp2_target
*tgt
= lu
->tgt
;
698 struct fw_card
*card
= fw_device(tgt
->unit
->device
.parent
)->card
;
699 struct Scsi_Host
*shost
=
700 container_of((void *)tgt
, struct Scsi_Host
, hostdata
[0]);
703 spin_lock_irqsave(&card
->lock
, flags
);
704 if (!tgt
->dont_block
&& !lu
->blocked
&&
705 lu
->generation
!= card
->generation
) {
707 if (++tgt
->blocked
== 1)
708 scsi_block_requests(shost
);
710 spin_unlock_irqrestore(&card
->lock
, flags
);
714 * Unblocks lu->tgt as soon as all its logical units can be unblocked.
715 * Note, it is harmless to run scsi_unblock_requests() outside the
716 * card->lock protected section. On the other hand, running it inside
717 * the section might clash with shost->host_lock.
719 static void sbp2_conditionally_unblock(struct sbp2_logical_unit
*lu
)
721 struct sbp2_target
*tgt
= lu
->tgt
;
722 struct fw_card
*card
= fw_device(tgt
->unit
->device
.parent
)->card
;
723 struct Scsi_Host
*shost
=
724 container_of((void *)tgt
, struct Scsi_Host
, hostdata
[0]);
726 bool unblock
= false;
728 spin_lock_irqsave(&card
->lock
, flags
);
729 if (lu
->blocked
&& lu
->generation
== card
->generation
) {
731 unblock
= --tgt
->blocked
== 0;
733 spin_unlock_irqrestore(&card
->lock
, flags
);
736 scsi_unblock_requests(shost
);
740 * Prevents future blocking of tgt and unblocks it.
741 * Note, it is harmless to run scsi_unblock_requests() outside the
742 * card->lock protected section. On the other hand, running it inside
743 * the section might clash with shost->host_lock.
745 static void sbp2_unblock(struct sbp2_target
*tgt
)
747 struct fw_card
*card
= fw_device(tgt
->unit
->device
.parent
)->card
;
748 struct Scsi_Host
*shost
=
749 container_of((void *)tgt
, struct Scsi_Host
, hostdata
[0]);
752 spin_lock_irqsave(&card
->lock
, flags
);
754 spin_unlock_irqrestore(&card
->lock
, flags
);
756 scsi_unblock_requests(shost
);
759 static int sbp2_lun2int(u16 lun
)
761 struct scsi_lun eight_bytes_lun
;
763 memset(&eight_bytes_lun
, 0, sizeof(eight_bytes_lun
));
764 eight_bytes_lun
.scsi_lun
[0] = (lun
>> 8) & 0xff;
765 eight_bytes_lun
.scsi_lun
[1] = lun
& 0xff;
767 return scsilun_to_int(&eight_bytes_lun
);
770 static void sbp2_release_target(struct kref
*kref
)
772 struct sbp2_target
*tgt
= container_of(kref
, struct sbp2_target
, kref
);
773 struct sbp2_logical_unit
*lu
, *next
;
774 struct Scsi_Host
*shost
=
775 container_of((void *)tgt
, struct Scsi_Host
, hostdata
[0]);
776 struct scsi_device
*sdev
;
777 struct fw_device
*device
= fw_device(tgt
->unit
->device
.parent
);
779 /* prevent deadlocks */
782 list_for_each_entry_safe(lu
, next
, &tgt
->lu_list
, link
) {
783 sdev
= scsi_device_lookup(shost
, 0, 0, sbp2_lun2int(lu
->lun
));
785 scsi_remove_device(sdev
);
786 scsi_device_put(sdev
);
788 if (lu
->login_id
!= INVALID_LOGIN_ID
) {
789 int generation
, node_id
;
791 * tgt->node_id may be obsolete here if we failed
792 * during initial login or after a bus reset where
793 * the topology changed.
795 generation
= device
->generation
;
796 smp_rmb(); /* node_id vs. generation */
797 node_id
= device
->node_id
;
798 sbp2_send_management_orb(lu
, node_id
, generation
,
802 fw_core_remove_address_handler(&lu
->address_handler
);
806 scsi_remove_host(shost
);
807 fw_notify("released %s, target %d:0:0\n", tgt
->bus_id
, shost
->host_no
);
809 fw_unit_put(tgt
->unit
);
810 scsi_host_put(shost
);
811 fw_device_put(device
);
814 static struct workqueue_struct
*sbp2_wq
;
816 static void sbp2_target_put(struct sbp2_target
*tgt
)
818 kref_put(&tgt
->kref
, sbp2_release_target
);
822 * Always get the target's kref when scheduling work on one its units.
823 * Each workqueue job is responsible to call sbp2_target_put() upon return.
825 static void sbp2_queue_work(struct sbp2_logical_unit
*lu
, unsigned long delay
)
827 kref_get(&lu
->tgt
->kref
);
828 if (!queue_delayed_work(sbp2_wq
, &lu
->work
, delay
))
829 sbp2_target_put(lu
->tgt
);
833 * Write retransmit retry values into the BUSY_TIMEOUT register.
834 * - The single-phase retry protocol is supported by all SBP-2 devices, but the
835 * default retry_limit value is 0 (i.e. never retry transmission). We write a
836 * saner value after logging into the device.
837 * - The dual-phase retry protocol is optional to implement, and if not
838 * supported, writes to the dual-phase portion of the register will be
839 * ignored. We try to write the original 1394-1995 default here.
840 * - In the case of devices that are also SBP-3-compliant, all writes are
841 * ignored, as the register is read-only, but contains single-phase retry of
842 * 15, which is what we're trying to set for all SBP-2 device anyway, so this
843 * write attempt is safe and yields more consistent behavior for all devices.
845 * See section 8.3.2.3.5 of the 1394-1995 spec, section 6.2 of the SBP-2 spec,
846 * and section 6.4 of the SBP-3 spec for further details.
848 static void sbp2_set_busy_timeout(struct sbp2_logical_unit
*lu
)
850 struct fw_device
*device
= fw_device(lu
->tgt
->unit
->device
.parent
);
851 __be32 d
= cpu_to_be32(SBP2_CYCLE_LIMIT
| SBP2_RETRY_LIMIT
);
853 fw_run_transaction(device
->card
, TCODE_WRITE_QUADLET_REQUEST
,
854 lu
->tgt
->node_id
, lu
->generation
, device
->max_speed
,
855 CSR_REGISTER_BASE
+ CSR_BUSY_TIMEOUT
,
859 static void sbp2_reconnect(struct work_struct
*work
);
861 static void sbp2_login(struct work_struct
*work
)
863 struct sbp2_logical_unit
*lu
=
864 container_of(work
, struct sbp2_logical_unit
, work
.work
);
865 struct sbp2_target
*tgt
= lu
->tgt
;
866 struct fw_device
*device
= fw_device(tgt
->unit
->device
.parent
);
867 struct Scsi_Host
*shost
;
868 struct scsi_device
*sdev
;
869 struct sbp2_login_response response
;
870 int generation
, node_id
, local_node_id
;
872 if (fw_device_is_shutdown(device
))
875 generation
= device
->generation
;
876 smp_rmb(); /* node IDs must not be older than generation */
877 node_id
= device
->node_id
;
878 local_node_id
= device
->card
->node_id
;
880 /* If this is a re-login attempt, log out, or we might be rejected. */
882 sbp2_send_management_orb(lu
, device
->node_id
, generation
,
883 SBP2_LOGOUT_REQUEST
, lu
->login_id
, NULL
);
885 if (sbp2_send_management_orb(lu
, node_id
, generation
,
886 SBP2_LOGIN_REQUEST
, lu
->lun
, &response
) < 0) {
887 if (lu
->retries
++ < 5) {
888 sbp2_queue_work(lu
, DIV_ROUND_UP(HZ
, 5));
890 fw_error("%s: failed to login to LUN %04x\n",
891 tgt
->bus_id
, lu
->lun
);
892 /* Let any waiting I/O fail from now on. */
893 sbp2_unblock(lu
->tgt
);
898 tgt
->node_id
= node_id
;
899 tgt
->address_high
= local_node_id
<< 16;
900 smp_wmb(); /* node IDs must not be older than generation */
901 lu
->generation
= generation
;
903 lu
->command_block_agent_address
=
904 ((u64
)(be32_to_cpu(response
.command_block_agent
.high
) & 0xffff)
905 << 32) | be32_to_cpu(response
.command_block_agent
.low
);
906 lu
->login_id
= be32_to_cpu(response
.misc
) & 0xffff;
908 fw_notify("%s: logged in to LUN %04x (%d retries)\n",
909 tgt
->bus_id
, lu
->lun
, lu
->retries
);
911 /* set appropriate retry limit(s) in BUSY_TIMEOUT register */
912 sbp2_set_busy_timeout(lu
);
914 PREPARE_DELAYED_WORK(&lu
->work
, sbp2_reconnect
);
915 sbp2_agent_reset(lu
);
917 /* This was a re-login. */
919 sbp2_cancel_orbs(lu
);
920 sbp2_conditionally_unblock(lu
);
924 if (lu
->tgt
->workarounds
& SBP2_WORKAROUND_DELAY_INQUIRY
)
925 ssleep(SBP2_INQUIRY_DELAY
);
927 shost
= container_of((void *)tgt
, struct Scsi_Host
, hostdata
[0]);
928 sdev
= __scsi_add_device(shost
, 0, 0, sbp2_lun2int(lu
->lun
), lu
);
930 * FIXME: We are unable to perform reconnects while in sbp2_login().
931 * Therefore __scsi_add_device() will get into trouble if a bus reset
932 * happens in parallel. It will either fail or leave us with an
933 * unusable sdev. As a workaround we check for this and retry the
934 * whole login and SCSI probing.
937 /* Reported error during __scsi_add_device() */
939 goto out_logout_login
;
941 /* Unreported error during __scsi_add_device() */
942 smp_rmb(); /* get current card generation */
943 if (generation
!= device
->card
->generation
) {
944 scsi_remove_device(sdev
);
945 scsi_device_put(sdev
);
946 goto out_logout_login
;
949 /* No error during __scsi_add_device() */
951 scsi_device_put(sdev
);
952 sbp2_allow_block(lu
);
956 smp_rmb(); /* generation may have changed */
957 generation
= device
->generation
;
958 smp_rmb(); /* node_id must not be older than generation */
960 sbp2_send_management_orb(lu
, device
->node_id
, generation
,
961 SBP2_LOGOUT_REQUEST
, lu
->login_id
, NULL
);
963 * If a bus reset happened, sbp2_update will have requeued
964 * lu->work already. Reset the work from reconnect to login.
966 PREPARE_DELAYED_WORK(&lu
->work
, sbp2_login
);
968 sbp2_target_put(tgt
);
971 static int sbp2_add_logical_unit(struct sbp2_target
*tgt
, int lun_entry
)
973 struct sbp2_logical_unit
*lu
;
975 lu
= kmalloc(sizeof(*lu
), GFP_KERNEL
);
979 lu
->address_handler
.length
= 0x100;
980 lu
->address_handler
.address_callback
= sbp2_status_write
;
981 lu
->address_handler
.callback_data
= lu
;
983 if (fw_core_add_address_handler(&lu
->address_handler
,
984 &fw_high_memory_region
) < 0) {
990 lu
->lun
= lun_entry
& 0xffff;
991 lu
->login_id
= INVALID_LOGIN_ID
;
993 lu
->has_sdev
= false;
996 INIT_LIST_HEAD(&lu
->orb_list
);
997 INIT_DELAYED_WORK(&lu
->work
, sbp2_login
);
999 list_add_tail(&lu
->link
, &tgt
->lu_list
);
1003 static int sbp2_scan_logical_unit_dir(struct sbp2_target
*tgt
, u32
*directory
)
1005 struct fw_csr_iterator ci
;
1008 fw_csr_iterator_init(&ci
, directory
);
1009 while (fw_csr_iterator_next(&ci
, &key
, &value
))
1010 if (key
== SBP2_CSR_LOGICAL_UNIT_NUMBER
&&
1011 sbp2_add_logical_unit(tgt
, value
) < 0)
1016 static int sbp2_scan_unit_dir(struct sbp2_target
*tgt
, u32
*directory
,
1017 u32
*model
, u32
*firmware_revision
)
1019 struct fw_csr_iterator ci
;
1021 unsigned int timeout
;
1023 fw_csr_iterator_init(&ci
, directory
);
1024 while (fw_csr_iterator_next(&ci
, &key
, &value
)) {
1027 case CSR_DEPENDENT_INFO
| CSR_OFFSET
:
1028 tgt
->management_agent_address
=
1029 CSR_REGISTER_BASE
+ 4 * value
;
1032 case CSR_DIRECTORY_ID
:
1033 tgt
->directory_id
= value
;
1040 case SBP2_CSR_FIRMWARE_REVISION
:
1041 *firmware_revision
= value
;
1044 case SBP2_CSR_UNIT_CHARACTERISTICS
:
1045 /* the timeout value is stored in 500ms units */
1046 timeout
= ((unsigned int) value
>> 8 & 0xff) * 500;
1047 timeout
= max(timeout
, SBP2_MIN_LOGIN_ORB_TIMEOUT
);
1048 tgt
->mgt_orb_timeout
=
1049 min(timeout
, SBP2_MAX_LOGIN_ORB_TIMEOUT
);
1051 if (timeout
> tgt
->mgt_orb_timeout
)
1052 fw_notify("%s: config rom contains %ds "
1053 "management ORB timeout, limiting "
1054 "to %ds\n", tgt
->bus_id
,
1056 tgt
->mgt_orb_timeout
/ 1000);
1059 case SBP2_CSR_LOGICAL_UNIT_NUMBER
:
1060 if (sbp2_add_logical_unit(tgt
, value
) < 0)
1064 case SBP2_CSR_LOGICAL_UNIT_DIRECTORY
:
1065 /* Adjust for the increment in the iterator */
1066 if (sbp2_scan_logical_unit_dir(tgt
, ci
.p
- 1 + value
) < 0)
1074 static void sbp2_init_workarounds(struct sbp2_target
*tgt
, u32 model
,
1075 u32 firmware_revision
)
1078 unsigned int w
= sbp2_param_workarounds
;
1081 fw_notify("Please notify linux1394-devel@lists.sourceforge.net "
1082 "if you need the workarounds parameter for %s\n",
1085 if (w
& SBP2_WORKAROUND_OVERRIDE
)
1088 for (i
= 0; i
< ARRAY_SIZE(sbp2_workarounds_table
); i
++) {
1090 if (sbp2_workarounds_table
[i
].firmware_revision
!=
1091 (firmware_revision
& 0xffffff00))
1094 if (sbp2_workarounds_table
[i
].model
!= model
&&
1095 sbp2_workarounds_table
[i
].model
!= ~0)
1098 w
|= sbp2_workarounds_table
[i
].workarounds
;
1103 fw_notify("Workarounds for %s: 0x%x "
1104 "(firmware_revision 0x%06x, model_id 0x%06x)\n",
1105 tgt
->bus_id
, w
, firmware_revision
, model
);
1106 tgt
->workarounds
= w
;
1109 static struct scsi_host_template scsi_driver_template
;
1111 static int sbp2_probe(struct device
*dev
)
1113 struct fw_unit
*unit
= fw_unit(dev
);
1114 struct fw_device
*device
= fw_device(unit
->device
.parent
);
1115 struct sbp2_target
*tgt
;
1116 struct sbp2_logical_unit
*lu
;
1117 struct Scsi_Host
*shost
;
1118 u32 model
, firmware_revision
;
1120 if (dma_get_max_seg_size(device
->card
->device
) > SBP2_MAX_SEG_SIZE
)
1121 BUG_ON(dma_set_max_seg_size(device
->card
->device
,
1122 SBP2_MAX_SEG_SIZE
));
1124 shost
= scsi_host_alloc(&scsi_driver_template
, sizeof(*tgt
));
1128 tgt
= (struct sbp2_target
*)shost
->hostdata
;
1129 unit
->device
.driver_data
= tgt
;
1131 kref_init(&tgt
->kref
);
1132 INIT_LIST_HEAD(&tgt
->lu_list
);
1133 tgt
->bus_id
= dev_name(&unit
->device
);
1134 tgt
->guid
= (u64
)device
->config_rom
[3] << 32 | device
->config_rom
[4];
1136 if (fw_device_enable_phys_dma(device
) < 0)
1137 goto fail_shost_put
;
1139 if (scsi_add_host(shost
, &unit
->device
) < 0)
1140 goto fail_shost_put
;
1142 fw_device_get(device
);
1145 /* Initialize to values that won't match anything in our table. */
1146 firmware_revision
= 0xff000000;
1149 /* implicit directory ID */
1150 tgt
->directory_id
= ((unit
->directory
- device
->config_rom
) * 4
1151 + CSR_CONFIG_ROM
) & 0xffffff;
1153 if (sbp2_scan_unit_dir(tgt
, unit
->directory
, &model
,
1154 &firmware_revision
) < 0)
1157 sbp2_init_workarounds(tgt
, model
, firmware_revision
);
1159 /* Do the login in a workqueue so we can easily reschedule retries. */
1160 list_for_each_entry(lu
, &tgt
->lu_list
, link
)
1161 sbp2_queue_work(lu
, DIV_ROUND_UP(HZ
, 5));
1165 sbp2_target_put(tgt
);
1169 scsi_host_put(shost
);
1173 static int sbp2_remove(struct device
*dev
)
1175 struct fw_unit
*unit
= fw_unit(dev
);
1176 struct sbp2_target
*tgt
= unit
->device
.driver_data
;
1178 sbp2_target_put(tgt
);
1182 static void sbp2_reconnect(struct work_struct
*work
)
1184 struct sbp2_logical_unit
*lu
=
1185 container_of(work
, struct sbp2_logical_unit
, work
.work
);
1186 struct sbp2_target
*tgt
= lu
->tgt
;
1187 struct fw_device
*device
= fw_device(tgt
->unit
->device
.parent
);
1188 int generation
, node_id
, local_node_id
;
1190 if (fw_device_is_shutdown(device
))
1193 generation
= device
->generation
;
1194 smp_rmb(); /* node IDs must not be older than generation */
1195 node_id
= device
->node_id
;
1196 local_node_id
= device
->card
->node_id
;
1198 if (sbp2_send_management_orb(lu
, node_id
, generation
,
1199 SBP2_RECONNECT_REQUEST
,
1200 lu
->login_id
, NULL
) < 0) {
1202 * If reconnect was impossible even though we are in the
1203 * current generation, fall back and try to log in again.
1205 * We could check for "Function rejected" status, but
1206 * looking at the bus generation as simpler and more general.
1208 smp_rmb(); /* get current card generation */
1209 if (generation
== device
->card
->generation
||
1210 lu
->retries
++ >= 5) {
1211 fw_error("%s: failed to reconnect\n", tgt
->bus_id
);
1213 PREPARE_DELAYED_WORK(&lu
->work
, sbp2_login
);
1215 sbp2_queue_work(lu
, DIV_ROUND_UP(HZ
, 5));
1219 tgt
->node_id
= node_id
;
1220 tgt
->address_high
= local_node_id
<< 16;
1221 smp_wmb(); /* node IDs must not be older than generation */
1222 lu
->generation
= generation
;
1224 fw_notify("%s: reconnected to LUN %04x (%d retries)\n",
1225 tgt
->bus_id
, lu
->lun
, lu
->retries
);
1227 sbp2_agent_reset(lu
);
1228 sbp2_cancel_orbs(lu
);
1229 sbp2_conditionally_unblock(lu
);
1231 sbp2_target_put(tgt
);
1234 static void sbp2_update(struct fw_unit
*unit
)
1236 struct sbp2_target
*tgt
= unit
->device
.driver_data
;
1237 struct sbp2_logical_unit
*lu
;
1239 fw_device_enable_phys_dma(fw_device(unit
->device
.parent
));
1242 * Fw-core serializes sbp2_update() against sbp2_remove().
1243 * Iteration over tgt->lu_list is therefore safe here.
1245 list_for_each_entry(lu
, &tgt
->lu_list
, link
) {
1246 sbp2_conditionally_block(lu
);
1248 sbp2_queue_work(lu
, 0);
1252 #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
1253 #define SBP2_SW_VERSION_ENTRY 0x00010483
1255 static const struct fw_device_id sbp2_id_table
[] = {
1257 .match_flags
= FW_MATCH_SPECIFIER_ID
| FW_MATCH_VERSION
,
1258 .specifier_id
= SBP2_UNIT_SPEC_ID_ENTRY
,
1259 .version
= SBP2_SW_VERSION_ENTRY
,
1264 static struct fw_driver sbp2_driver
= {
1266 .owner
= THIS_MODULE
,
1267 .name
= sbp2_driver_name
,
1268 .bus
= &fw_bus_type
,
1269 .probe
= sbp2_probe
,
1270 .remove
= sbp2_remove
,
1272 .update
= sbp2_update
,
1273 .id_table
= sbp2_id_table
,
1277 sbp2_status_to_sense_data(u8
*sbp2_status
, u8
*sense_data
)
1281 sense_data
[0] = 0x70;
1282 sense_data
[1] = 0x0;
1283 sense_data
[2] = sbp2_status
[1];
1284 sense_data
[3] = sbp2_status
[4];
1285 sense_data
[4] = sbp2_status
[5];
1286 sense_data
[5] = sbp2_status
[6];
1287 sense_data
[6] = sbp2_status
[7];
1289 sense_data
[8] = sbp2_status
[8];
1290 sense_data
[9] = sbp2_status
[9];
1291 sense_data
[10] = sbp2_status
[10];
1292 sense_data
[11] = sbp2_status
[11];
1293 sense_data
[12] = sbp2_status
[2];
1294 sense_data
[13] = sbp2_status
[3];
1295 sense_data
[14] = sbp2_status
[12];
1296 sense_data
[15] = sbp2_status
[13];
1298 sam_status
= sbp2_status
[0] & 0x3f;
1300 switch (sam_status
) {
1302 case SAM_STAT_CHECK_CONDITION
:
1303 case SAM_STAT_CONDITION_MET
:
1305 case SAM_STAT_RESERVATION_CONFLICT
:
1306 case SAM_STAT_COMMAND_TERMINATED
:
1307 return DID_OK
<< 16 | sam_status
;
1310 return DID_ERROR
<< 16;
1315 complete_command_orb(struct sbp2_orb
*base_orb
, struct sbp2_status
*status
)
1317 struct sbp2_command_orb
*orb
=
1318 container_of(base_orb
, struct sbp2_command_orb
, base
);
1319 struct fw_device
*device
= fw_device(orb
->lu
->tgt
->unit
->device
.parent
);
1322 if (status
!= NULL
) {
1323 if (STATUS_GET_DEAD(*status
))
1324 sbp2_agent_reset_no_wait(orb
->lu
);
1326 switch (STATUS_GET_RESPONSE(*status
)) {
1327 case SBP2_STATUS_REQUEST_COMPLETE
:
1328 result
= DID_OK
<< 16;
1330 case SBP2_STATUS_TRANSPORT_FAILURE
:
1331 result
= DID_BUS_BUSY
<< 16;
1333 case SBP2_STATUS_ILLEGAL_REQUEST
:
1334 case SBP2_STATUS_VENDOR_DEPENDENT
:
1336 result
= DID_ERROR
<< 16;
1340 if (result
== DID_OK
<< 16 && STATUS_GET_LEN(*status
) > 1)
1341 result
= sbp2_status_to_sense_data(STATUS_GET_DATA(*status
),
1342 orb
->cmd
->sense_buffer
);
1345 * If the orb completes with status == NULL, something
1346 * went wrong, typically a bus reset happened mid-orb
1347 * or when sending the write (less likely).
1349 result
= DID_BUS_BUSY
<< 16;
1350 sbp2_conditionally_block(orb
->lu
);
1353 dma_unmap_single(device
->card
->device
, orb
->base
.request_bus
,
1354 sizeof(orb
->request
), DMA_TO_DEVICE
);
1356 if (scsi_sg_count(orb
->cmd
) > 0)
1357 dma_unmap_sg(device
->card
->device
, scsi_sglist(orb
->cmd
),
1358 scsi_sg_count(orb
->cmd
),
1359 orb
->cmd
->sc_data_direction
);
1361 if (orb
->page_table_bus
!= 0)
1362 dma_unmap_single(device
->card
->device
, orb
->page_table_bus
,
1363 sizeof(orb
->page_table
), DMA_TO_DEVICE
);
1365 orb
->cmd
->result
= result
;
1366 orb
->done(orb
->cmd
);
1370 sbp2_map_scatterlist(struct sbp2_command_orb
*orb
, struct fw_device
*device
,
1371 struct sbp2_logical_unit
*lu
)
1373 struct scatterlist
*sg
= scsi_sglist(orb
->cmd
);
1376 n
= dma_map_sg(device
->card
->device
, sg
, scsi_sg_count(orb
->cmd
),
1377 orb
->cmd
->sc_data_direction
);
1382 * Handle the special case where there is only one element in
1383 * the scatter list by converting it to an immediate block
1384 * request. This is also a workaround for broken devices such
1385 * as the second generation iPod which doesn't support page
1389 orb
->request
.data_descriptor
.high
=
1390 cpu_to_be32(lu
->tgt
->address_high
);
1391 orb
->request
.data_descriptor
.low
=
1392 cpu_to_be32(sg_dma_address(sg
));
1393 orb
->request
.misc
|=
1394 cpu_to_be32(COMMAND_ORB_DATA_SIZE(sg_dma_len(sg
)));
1398 for_each_sg(sg
, sg
, n
, i
) {
1399 orb
->page_table
[i
].high
= cpu_to_be32(sg_dma_len(sg
) << 16);
1400 orb
->page_table
[i
].low
= cpu_to_be32(sg_dma_address(sg
));
1403 orb
->page_table_bus
=
1404 dma_map_single(device
->card
->device
, orb
->page_table
,
1405 sizeof(orb
->page_table
), DMA_TO_DEVICE
);
1406 if (dma_mapping_error(device
->card
->device
, orb
->page_table_bus
))
1407 goto fail_page_table
;
1410 * The data_descriptor pointer is the one case where we need
1411 * to fill in the node ID part of the address. All other
1412 * pointers assume that the data referenced reside on the
1413 * initiator (i.e. us), but data_descriptor can refer to data
1414 * on other nodes so we need to put our ID in descriptor.high.
1416 orb
->request
.data_descriptor
.high
= cpu_to_be32(lu
->tgt
->address_high
);
1417 orb
->request
.data_descriptor
.low
= cpu_to_be32(orb
->page_table_bus
);
1418 orb
->request
.misc
|= cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT
|
1419 COMMAND_ORB_DATA_SIZE(n
));
1424 dma_unmap_sg(device
->card
->device
, scsi_sglist(orb
->cmd
),
1425 scsi_sg_count(orb
->cmd
), orb
->cmd
->sc_data_direction
);
1430 /* SCSI stack integration */
1432 static int sbp2_scsi_queuecommand(struct scsi_cmnd
*cmd
, scsi_done_fn_t done
)
1434 struct sbp2_logical_unit
*lu
= cmd
->device
->hostdata
;
1435 struct fw_device
*device
= fw_device(lu
->tgt
->unit
->device
.parent
);
1436 struct sbp2_command_orb
*orb
;
1437 unsigned int max_payload
;
1438 int generation
, retval
= SCSI_MLQUEUE_HOST_BUSY
;
1441 * Bidirectional commands are not yet implemented, and unknown
1442 * transfer direction not handled.
1444 if (cmd
->sc_data_direction
== DMA_BIDIRECTIONAL
) {
1445 fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n");
1446 cmd
->result
= DID_ERROR
<< 16;
1451 orb
= kzalloc(sizeof(*orb
), GFP_ATOMIC
);
1453 fw_notify("failed to alloc orb\n");
1454 return SCSI_MLQUEUE_HOST_BUSY
;
1457 /* Initialize rcode to something not RCODE_COMPLETE. */
1458 orb
->base
.rcode
= -1;
1459 kref_init(&orb
->base
.kref
);
1465 orb
->request
.next
.high
= cpu_to_be32(SBP2_ORB_NULL
);
1467 * At speed 100 we can do 512 bytes per packet, at speed 200,
1468 * 1024 bytes per packet etc. The SBP-2 max_payload field
1469 * specifies the max payload size as 2 ^ (max_payload + 2), so
1470 * if we set this to max_speed + 7, we get the right value.
1472 max_payload
= min(device
->max_speed
+ 7,
1473 device
->card
->max_receive
- 1);
1474 orb
->request
.misc
= cpu_to_be32(
1475 COMMAND_ORB_MAX_PAYLOAD(max_payload
) |
1476 COMMAND_ORB_SPEED(device
->max_speed
) |
1477 COMMAND_ORB_NOTIFY
);
1479 if (cmd
->sc_data_direction
== DMA_FROM_DEVICE
)
1480 orb
->request
.misc
|= cpu_to_be32(COMMAND_ORB_DIRECTION
);
1482 generation
= device
->generation
;
1483 smp_rmb(); /* sbp2_map_scatterlist looks at tgt->address_high */
1485 if (scsi_sg_count(cmd
) && sbp2_map_scatterlist(orb
, device
, lu
) < 0)
1488 memcpy(orb
->request
.command_block
, cmd
->cmnd
, cmd
->cmd_len
);
1490 orb
->base
.callback
= complete_command_orb
;
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(device
->card
->device
, orb
->base
.request_bus
))
1497 sbp2_send_orb(&orb
->base
, lu
, lu
->tgt
->node_id
, generation
,
1498 lu
->command_block_agent_address
+ SBP2_ORB_POINTER
);
1501 kref_put(&orb
->base
.kref
, free_orb
);
1505 static int sbp2_scsi_slave_alloc(struct scsi_device
*sdev
)
1507 struct sbp2_logical_unit
*lu
= sdev
->hostdata
;
1509 /* (Re-)Adding logical units via the SCSI stack is not supported. */
1513 sdev
->allow_restart
= 1;
1515 /* SBP-2 requires quadlet alignment of the data buffers. */
1516 blk_queue_update_dma_alignment(sdev
->request_queue
, 4 - 1);
1518 if (lu
->tgt
->workarounds
& SBP2_WORKAROUND_INQUIRY_36
)
1519 sdev
->inquiry_len
= 36;
1524 static int sbp2_scsi_slave_configure(struct scsi_device
*sdev
)
1526 struct sbp2_logical_unit
*lu
= sdev
->hostdata
;
1528 sdev
->use_10_for_rw
= 1;
1530 if (sbp2_param_exclusive_login
)
1531 sdev
->manage_start_stop
= 1;
1533 if (sdev
->type
== TYPE_ROM
)
1534 sdev
->use_10_for_ms
= 1;
1536 if (sdev
->type
== TYPE_DISK
&&
1537 lu
->tgt
->workarounds
& SBP2_WORKAROUND_MODE_SENSE_8
)
1538 sdev
->skip_ms_page_8
= 1;
1540 if (lu
->tgt
->workarounds
& SBP2_WORKAROUND_FIX_CAPACITY
)
1541 sdev
->fix_capacity
= 1;
1543 if (lu
->tgt
->workarounds
& SBP2_WORKAROUND_POWER_CONDITION
)
1544 sdev
->start_stop_pwr_cond
= 1;
1546 if (lu
->tgt
->workarounds
& SBP2_WORKAROUND_128K_MAX_TRANS
)
1547 blk_queue_max_sectors(sdev
->request_queue
, 128 * 1024 / 512);
1549 blk_queue_max_segment_size(sdev
->request_queue
, SBP2_MAX_SEG_SIZE
);
1555 * Called by scsi stack when something has really gone wrong. Usually
1556 * called when a command has timed-out for some reason.
1558 static int sbp2_scsi_abort(struct scsi_cmnd
*cmd
)
1560 struct sbp2_logical_unit
*lu
= cmd
->device
->hostdata
;
1562 fw_notify("%s: sbp2_scsi_abort\n", lu
->tgt
->bus_id
);
1563 sbp2_agent_reset(lu
);
1564 sbp2_cancel_orbs(lu
);
1570 * Format of /sys/bus/scsi/devices/.../ieee1394_id:
1571 * u64 EUI-64 : u24 directory_ID : u16 LUN (all printed in hexadecimal)
1573 * This is the concatenation of target port identifier and logical unit
1574 * identifier as per SAM-2...SAM-4 annex A.
1577 sbp2_sysfs_ieee1394_id_show(struct device
*dev
, struct device_attribute
*attr
,
1580 struct scsi_device
*sdev
= to_scsi_device(dev
);
1581 struct sbp2_logical_unit
*lu
;
1586 lu
= sdev
->hostdata
;
1588 return sprintf(buf
, "%016llx:%06x:%04x\n",
1589 (unsigned long long)lu
->tgt
->guid
,
1590 lu
->tgt
->directory_id
, lu
->lun
);
1593 static DEVICE_ATTR(ieee1394_id
, S_IRUGO
, sbp2_sysfs_ieee1394_id_show
, NULL
);
1595 static struct device_attribute
*sbp2_scsi_sysfs_attrs
[] = {
1596 &dev_attr_ieee1394_id
,
1600 static struct scsi_host_template scsi_driver_template
= {
1601 .module
= THIS_MODULE
,
1602 .name
= "SBP-2 IEEE-1394",
1603 .proc_name
= sbp2_driver_name
,
1604 .queuecommand
= sbp2_scsi_queuecommand
,
1605 .slave_alloc
= sbp2_scsi_slave_alloc
,
1606 .slave_configure
= sbp2_scsi_slave_configure
,
1607 .eh_abort_handler
= sbp2_scsi_abort
,
1609 .sg_tablesize
= SG_ALL
,
1610 .use_clustering
= ENABLE_CLUSTERING
,
1613 .sdev_attrs
= sbp2_scsi_sysfs_attrs
,
1616 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
1617 MODULE_DESCRIPTION("SCSI over IEEE1394");
1618 MODULE_LICENSE("GPL");
1619 MODULE_DEVICE_TABLE(ieee1394
, sbp2_id_table
);
1621 /* Provide a module alias so root-on-sbp2 initrds don't break. */
1622 #ifndef CONFIG_IEEE1394_SBP2_MODULE
1623 MODULE_ALIAS("sbp2");
1626 static int __init
sbp2_init(void)
1628 sbp2_wq
= create_singlethread_workqueue(KBUILD_MODNAME
);
1632 return driver_register(&sbp2_driver
.driver
);
1635 static void __exit
sbp2_cleanup(void)
1637 driver_unregister(&sbp2_driver
.driver
);
1638 destroy_workqueue(sbp2_wq
);
1641 module_init(sbp2_init
);
1642 module_exit(sbp2_cleanup
);