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
;
171 unsigned int max_payload
;
173 int dont_block
; /* counter for each logical unit */
174 int blocked
; /* ditto */
177 /* Impossible login_id, to detect logout attempt before successful login */
178 #define INVALID_LOGIN_ID 0x10000
181 * Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be
182 * provided in the config rom. Most devices do provide a value, which
183 * we'll use for login management orbs, but with some sane limits.
185 #define SBP2_MIN_LOGIN_ORB_TIMEOUT 5000U /* Timeout in ms */
186 #define SBP2_MAX_LOGIN_ORB_TIMEOUT 40000U /* Timeout in ms */
187 #define SBP2_ORB_TIMEOUT 2000U /* Timeout in ms */
188 #define SBP2_ORB_NULL 0x80000000
189 #define SBP2_RETRY_LIMIT 0xf /* 15 retries */
190 #define SBP2_CYCLE_LIMIT (0xc8 << 12) /* 200 125us cycles */
193 * The default maximum s/g segment size of a FireWire controller is
194 * usually 0x10000, but SBP-2 only allows 0xffff. Since buffers have to
195 * be quadlet-aligned, we set the length limit to 0xffff & ~3.
197 #define SBP2_MAX_SEG_SIZE 0xfffc
199 /* Unit directory keys */
200 #define SBP2_CSR_UNIT_CHARACTERISTICS 0x3a
201 #define SBP2_CSR_FIRMWARE_REVISION 0x3c
202 #define SBP2_CSR_LOGICAL_UNIT_NUMBER 0x14
203 #define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4
205 /* Management orb opcodes */
206 #define SBP2_LOGIN_REQUEST 0x0
207 #define SBP2_QUERY_LOGINS_REQUEST 0x1
208 #define SBP2_RECONNECT_REQUEST 0x3
209 #define SBP2_SET_PASSWORD_REQUEST 0x4
210 #define SBP2_LOGOUT_REQUEST 0x7
211 #define SBP2_ABORT_TASK_REQUEST 0xb
212 #define SBP2_ABORT_TASK_SET 0xc
213 #define SBP2_LOGICAL_UNIT_RESET 0xe
214 #define SBP2_TARGET_RESET_REQUEST 0xf
216 /* Offsets for command block agent registers */
217 #define SBP2_AGENT_STATE 0x00
218 #define SBP2_AGENT_RESET 0x04
219 #define SBP2_ORB_POINTER 0x08
220 #define SBP2_DOORBELL 0x10
221 #define SBP2_UNSOLICITED_STATUS_ENABLE 0x14
223 /* Status write response codes */
224 #define SBP2_STATUS_REQUEST_COMPLETE 0x0
225 #define SBP2_STATUS_TRANSPORT_FAILURE 0x1
226 #define SBP2_STATUS_ILLEGAL_REQUEST 0x2
227 #define SBP2_STATUS_VENDOR_DEPENDENT 0x3
229 #define STATUS_GET_ORB_HIGH(v) ((v).status & 0xffff)
230 #define STATUS_GET_SBP_STATUS(v) (((v).status >> 16) & 0xff)
231 #define STATUS_GET_LEN(v) (((v).status >> 24) & 0x07)
232 #define STATUS_GET_DEAD(v) (((v).status >> 27) & 0x01)
233 #define STATUS_GET_RESPONSE(v) (((v).status >> 28) & 0x03)
234 #define STATUS_GET_SOURCE(v) (((v).status >> 30) & 0x03)
235 #define STATUS_GET_ORB_LOW(v) ((v).orb_low)
236 #define STATUS_GET_DATA(v) ((v).data)
244 struct sbp2_pointer
{
250 struct fw_transaction t
;
252 dma_addr_t request_bus
;
254 struct sbp2_pointer pointer
;
255 void (*callback
)(struct sbp2_orb
* orb
, struct sbp2_status
* status
);
256 struct list_head link
;
259 #define MANAGEMENT_ORB_LUN(v) ((v))
260 #define MANAGEMENT_ORB_FUNCTION(v) ((v) << 16)
261 #define MANAGEMENT_ORB_RECONNECT(v) ((v) << 20)
262 #define MANAGEMENT_ORB_EXCLUSIVE(v) ((v) ? 1 << 28 : 0)
263 #define MANAGEMENT_ORB_REQUEST_FORMAT(v) ((v) << 29)
264 #define MANAGEMENT_ORB_NOTIFY ((1) << 31)
266 #define MANAGEMENT_ORB_RESPONSE_LENGTH(v) ((v))
267 #define MANAGEMENT_ORB_PASSWORD_LENGTH(v) ((v) << 16)
269 struct sbp2_management_orb
{
270 struct sbp2_orb base
;
272 struct sbp2_pointer password
;
273 struct sbp2_pointer response
;
276 struct sbp2_pointer status_fifo
;
279 dma_addr_t response_bus
;
280 struct completion done
;
281 struct sbp2_status status
;
284 struct sbp2_login_response
{
286 struct sbp2_pointer command_block_agent
;
287 __be32 reconnect_hold
;
289 #define COMMAND_ORB_DATA_SIZE(v) ((v))
290 #define COMMAND_ORB_PAGE_SIZE(v) ((v) << 16)
291 #define COMMAND_ORB_PAGE_TABLE_PRESENT ((1) << 19)
292 #define COMMAND_ORB_MAX_PAYLOAD(v) ((v) << 20)
293 #define COMMAND_ORB_SPEED(v) ((v) << 24)
294 #define COMMAND_ORB_DIRECTION ((1) << 27)
295 #define COMMAND_ORB_REQUEST_FORMAT(v) ((v) << 29)
296 #define COMMAND_ORB_NOTIFY ((1) << 31)
298 struct sbp2_command_orb
{
299 struct sbp2_orb base
;
301 struct sbp2_pointer next
;
302 struct sbp2_pointer data_descriptor
;
304 u8 command_block
[12];
306 struct scsi_cmnd
*cmd
;
308 struct sbp2_logical_unit
*lu
;
310 struct sbp2_pointer page_table
[SG_ALL
] __attribute__((aligned(8)));
311 dma_addr_t page_table_bus
;
315 * List of devices with known bugs.
317 * The firmware_revision field, masked with 0xffff00, is the best
318 * indicator for the type of bridge chip of a device. It yields a few
319 * false positives but this did not break correctly behaving devices
320 * so far. We use ~0 as a wildcard, since the 24 bit values we get
321 * from the config rom can never match that.
323 static const struct {
324 u32 firmware_revision
;
326 unsigned int workarounds
;
327 } sbp2_workarounds_table
[] = {
328 /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
329 .firmware_revision
= 0x002800,
331 .workarounds
= SBP2_WORKAROUND_INQUIRY_36
|
332 SBP2_WORKAROUND_MODE_SENSE_8
|
333 SBP2_WORKAROUND_POWER_CONDITION
,
335 /* DViCO Momobay FX-3A with TSB42AA9A bridge */ {
336 .firmware_revision
= 0x002800,
338 .workarounds
= SBP2_WORKAROUND_DELAY_INQUIRY
|
339 SBP2_WORKAROUND_POWER_CONDITION
,
341 /* Initio bridges, actually only needed for some older ones */ {
342 .firmware_revision
= 0x000200,
344 .workarounds
= SBP2_WORKAROUND_INQUIRY_36
,
346 /* PL-3507 bridge with Prolific firmware */ {
347 .firmware_revision
= 0x012800,
349 .workarounds
= SBP2_WORKAROUND_POWER_CONDITION
,
351 /* Symbios bridge */ {
352 .firmware_revision
= 0xa0b800,
354 .workarounds
= SBP2_WORKAROUND_128K_MAX_TRANS
,
356 /* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ {
357 .firmware_revision
= 0x002600,
359 .workarounds
= SBP2_WORKAROUND_128K_MAX_TRANS
,
363 * There are iPods (2nd gen, 3rd gen) with model_id == 0, but
364 * these iPods do not feature the read_capacity bug according
365 * to one report. Read_capacity behaviour as well as model_id
366 * could change due to Apple-supplied firmware updates though.
369 /* iPod 4th generation. */ {
370 .firmware_revision
= 0x0a2700,
372 .workarounds
= SBP2_WORKAROUND_FIX_CAPACITY
,
375 .firmware_revision
= 0x0a2700,
377 .workarounds
= SBP2_WORKAROUND_FIX_CAPACITY
,
380 .firmware_revision
= 0x0a2700,
382 .workarounds
= SBP2_WORKAROUND_FIX_CAPACITY
,
385 .firmware_revision
= 0x0a2700,
387 .workarounds
= SBP2_WORKAROUND_FIX_CAPACITY
,
392 free_orb(struct kref
*kref
)
394 struct sbp2_orb
*orb
= container_of(kref
, struct sbp2_orb
, kref
);
400 sbp2_status_write(struct fw_card
*card
, struct fw_request
*request
,
401 int tcode
, int destination
, int source
,
402 int generation
, int speed
,
403 unsigned long long offset
,
404 void *payload
, size_t length
, void *callback_data
)
406 struct sbp2_logical_unit
*lu
= callback_data
;
407 struct sbp2_orb
*orb
;
408 struct sbp2_status status
;
412 if (tcode
!= TCODE_WRITE_BLOCK_REQUEST
||
413 length
== 0 || length
> sizeof(status
)) {
414 fw_send_response(card
, request
, RCODE_TYPE_ERROR
);
418 header_size
= min(length
, 2 * sizeof(u32
));
419 fw_memcpy_from_be32(&status
, payload
, header_size
);
420 if (length
> header_size
)
421 memcpy(status
.data
, payload
+ 8, length
- header_size
);
422 if (STATUS_GET_SOURCE(status
) == 2 || STATUS_GET_SOURCE(status
) == 3) {
423 fw_notify("non-orb related status write, not handled\n");
424 fw_send_response(card
, request
, RCODE_COMPLETE
);
428 /* Lookup the orb corresponding to this status write. */
429 spin_lock_irqsave(&card
->lock
, flags
);
430 list_for_each_entry(orb
, &lu
->orb_list
, link
) {
431 if (STATUS_GET_ORB_HIGH(status
) == 0 &&
432 STATUS_GET_ORB_LOW(status
) == orb
->request_bus
) {
433 orb
->rcode
= RCODE_COMPLETE
;
434 list_del(&orb
->link
);
438 spin_unlock_irqrestore(&card
->lock
, flags
);
440 if (&orb
->link
!= &lu
->orb_list
)
441 orb
->callback(orb
, &status
);
443 fw_error("status write for unknown orb\n");
445 kref_put(&orb
->kref
, free_orb
);
447 fw_send_response(card
, request
, RCODE_COMPLETE
);
451 complete_transaction(struct fw_card
*card
, int rcode
,
452 void *payload
, size_t length
, void *data
)
454 struct sbp2_orb
*orb
= data
;
458 * This is a little tricky. We can get the status write for
459 * the orb before we get this callback. The status write
460 * handler above will assume the orb pointer transaction was
461 * successful and set the rcode to RCODE_COMPLETE for the orb.
462 * So this callback only sets the rcode if it hasn't already
463 * been set and only does the cleanup if the transaction
464 * failed and we didn't already get a status write.
466 spin_lock_irqsave(&card
->lock
, flags
);
468 if (orb
->rcode
== -1)
470 if (orb
->rcode
!= RCODE_COMPLETE
) {
471 list_del(&orb
->link
);
472 spin_unlock_irqrestore(&card
->lock
, flags
);
473 orb
->callback(orb
, NULL
);
475 spin_unlock_irqrestore(&card
->lock
, flags
);
478 kref_put(&orb
->kref
, free_orb
);
482 sbp2_send_orb(struct sbp2_orb
*orb
, struct sbp2_logical_unit
*lu
,
483 int node_id
, int generation
, u64 offset
)
485 struct fw_device
*device
= fw_device(lu
->tgt
->unit
->device
.parent
);
488 orb
->pointer
.high
= 0;
489 orb
->pointer
.low
= cpu_to_be32(orb
->request_bus
);
491 spin_lock_irqsave(&device
->card
->lock
, flags
);
492 list_add_tail(&orb
->link
, &lu
->orb_list
);
493 spin_unlock_irqrestore(&device
->card
->lock
, flags
);
495 /* Take a ref for the orb list and for the transaction callback. */
496 kref_get(&orb
->kref
);
497 kref_get(&orb
->kref
);
499 fw_send_request(device
->card
, &orb
->t
, TCODE_WRITE_BLOCK_REQUEST
,
500 node_id
, generation
, device
->max_speed
, offset
,
501 &orb
->pointer
, sizeof(orb
->pointer
),
502 complete_transaction
, orb
);
505 static int sbp2_cancel_orbs(struct sbp2_logical_unit
*lu
)
507 struct fw_device
*device
= fw_device(lu
->tgt
->unit
->device
.parent
);
508 struct sbp2_orb
*orb
, *next
;
509 struct list_head list
;
511 int retval
= -ENOENT
;
513 INIT_LIST_HEAD(&list
);
514 spin_lock_irqsave(&device
->card
->lock
, flags
);
515 list_splice_init(&lu
->orb_list
, &list
);
516 spin_unlock_irqrestore(&device
->card
->lock
, flags
);
518 list_for_each_entry_safe(orb
, next
, &list
, link
) {
520 if (fw_cancel_transaction(device
->card
, &orb
->t
) == 0)
523 orb
->rcode
= RCODE_CANCELLED
;
524 orb
->callback(orb
, NULL
);
531 complete_management_orb(struct sbp2_orb
*base_orb
, struct sbp2_status
*status
)
533 struct sbp2_management_orb
*orb
=
534 container_of(base_orb
, struct sbp2_management_orb
, base
);
537 memcpy(&orb
->status
, status
, sizeof(*status
));
538 complete(&orb
->done
);
542 sbp2_send_management_orb(struct sbp2_logical_unit
*lu
, int node_id
,
543 int generation
, int function
, int lun_or_login_id
,
546 struct fw_device
*device
= fw_device(lu
->tgt
->unit
->device
.parent
);
547 struct sbp2_management_orb
*orb
;
548 unsigned int timeout
;
549 int retval
= -ENOMEM
;
551 if (function
== SBP2_LOGOUT_REQUEST
&& fw_device_is_shutdown(device
))
554 orb
= kzalloc(sizeof(*orb
), GFP_ATOMIC
);
558 kref_init(&orb
->base
.kref
);
560 dma_map_single(device
->card
->device
, &orb
->response
,
561 sizeof(orb
->response
), DMA_FROM_DEVICE
);
562 if (dma_mapping_error(device
->card
->device
, orb
->response_bus
))
563 goto fail_mapping_response
;
565 orb
->request
.response
.high
= 0;
566 orb
->request
.response
.low
= cpu_to_be32(orb
->response_bus
);
568 orb
->request
.misc
= cpu_to_be32(
569 MANAGEMENT_ORB_NOTIFY
|
570 MANAGEMENT_ORB_FUNCTION(function
) |
571 MANAGEMENT_ORB_LUN(lun_or_login_id
));
572 orb
->request
.length
= cpu_to_be32(
573 MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb
->response
)));
575 orb
->request
.status_fifo
.high
=
576 cpu_to_be32(lu
->address_handler
.offset
>> 32);
577 orb
->request
.status_fifo
.low
=
578 cpu_to_be32(lu
->address_handler
.offset
);
580 if (function
== SBP2_LOGIN_REQUEST
) {
581 /* Ask for 2^2 == 4 seconds reconnect grace period */
582 orb
->request
.misc
|= cpu_to_be32(
583 MANAGEMENT_ORB_RECONNECT(2) |
584 MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login
));
585 timeout
= lu
->tgt
->mgt_orb_timeout
;
587 timeout
= SBP2_ORB_TIMEOUT
;
590 init_completion(&orb
->done
);
591 orb
->base
.callback
= complete_management_orb
;
593 orb
->base
.request_bus
=
594 dma_map_single(device
->card
->device
, &orb
->request
,
595 sizeof(orb
->request
), DMA_TO_DEVICE
);
596 if (dma_mapping_error(device
->card
->device
, orb
->base
.request_bus
))
597 goto fail_mapping_request
;
599 sbp2_send_orb(&orb
->base
, lu
, node_id
, generation
,
600 lu
->tgt
->management_agent_address
);
602 wait_for_completion_timeout(&orb
->done
, msecs_to_jiffies(timeout
));
605 if (sbp2_cancel_orbs(lu
) == 0) {
606 fw_error("%s: orb reply timed out, rcode=0x%02x\n",
607 lu
->tgt
->bus_id
, orb
->base
.rcode
);
611 if (orb
->base
.rcode
!= RCODE_COMPLETE
) {
612 fw_error("%s: management write failed, rcode 0x%02x\n",
613 lu
->tgt
->bus_id
, orb
->base
.rcode
);
617 if (STATUS_GET_RESPONSE(orb
->status
) != 0 ||
618 STATUS_GET_SBP_STATUS(orb
->status
) != 0) {
619 fw_error("%s: error status: %d:%d\n", lu
->tgt
->bus_id
,
620 STATUS_GET_RESPONSE(orb
->status
),
621 STATUS_GET_SBP_STATUS(orb
->status
));
627 dma_unmap_single(device
->card
->device
, orb
->base
.request_bus
,
628 sizeof(orb
->request
), DMA_TO_DEVICE
);
629 fail_mapping_request
:
630 dma_unmap_single(device
->card
->device
, orb
->response_bus
,
631 sizeof(orb
->response
), DMA_FROM_DEVICE
);
632 fail_mapping_response
:
634 memcpy(response
, orb
->response
, sizeof(orb
->response
));
635 kref_put(&orb
->base
.kref
, free_orb
);
640 static void sbp2_agent_reset(struct sbp2_logical_unit
*lu
)
642 struct fw_device
*device
= fw_device(lu
->tgt
->unit
->device
.parent
);
645 fw_run_transaction(device
->card
, TCODE_WRITE_QUADLET_REQUEST
,
646 lu
->tgt
->node_id
, lu
->generation
, device
->max_speed
,
647 lu
->command_block_agent_address
+ SBP2_AGENT_RESET
,
652 complete_agent_reset_write_no_wait(struct fw_card
*card
, int rcode
,
653 void *payload
, size_t length
, void *data
)
658 static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit
*lu
)
660 struct fw_device
*device
= fw_device(lu
->tgt
->unit
->device
.parent
);
661 struct fw_transaction
*t
;
664 t
= kmalloc(sizeof(*t
), GFP_ATOMIC
);
668 fw_send_request(device
->card
, t
, TCODE_WRITE_QUADLET_REQUEST
,
669 lu
->tgt
->node_id
, lu
->generation
, device
->max_speed
,
670 lu
->command_block_agent_address
+ SBP2_AGENT_RESET
,
671 &d
, sizeof(d
), complete_agent_reset_write_no_wait
, t
);
674 static inline void sbp2_allow_block(struct sbp2_logical_unit
*lu
)
677 * We may access dont_block without taking card->lock here:
678 * All callers of sbp2_allow_block() and all callers of sbp2_unblock()
679 * are currently serialized against each other.
680 * And a wrong result in sbp2_conditionally_block()'s access of
681 * dont_block is rather harmless, it simply misses its first chance.
683 --lu
->tgt
->dont_block
;
687 * Blocks lu->tgt if all of the following conditions are met:
688 * - Login, INQUIRY, and high-level SCSI setup of all of the target's
689 * logical units have been finished (indicated by dont_block == 0).
690 * - lu->generation is stale.
692 * Note, scsi_block_requests() must be called while holding card->lock,
693 * otherwise it might foil sbp2_[conditionally_]unblock()'s attempt to
694 * unblock the target.
696 static void sbp2_conditionally_block(struct sbp2_logical_unit
*lu
)
698 struct sbp2_target
*tgt
= lu
->tgt
;
699 struct fw_card
*card
= fw_device(tgt
->unit
->device
.parent
)->card
;
700 struct Scsi_Host
*shost
=
701 container_of((void *)tgt
, struct Scsi_Host
, hostdata
[0]);
704 spin_lock_irqsave(&card
->lock
, flags
);
705 if (!tgt
->dont_block
&& !lu
->blocked
&&
706 lu
->generation
!= card
->generation
) {
708 if (++tgt
->blocked
== 1)
709 scsi_block_requests(shost
);
711 spin_unlock_irqrestore(&card
->lock
, flags
);
715 * Unblocks lu->tgt as soon as all its logical units can be unblocked.
716 * Note, it is harmless to run scsi_unblock_requests() outside the
717 * card->lock protected section. On the other hand, running it inside
718 * the section might clash with shost->host_lock.
720 static void sbp2_conditionally_unblock(struct sbp2_logical_unit
*lu
)
722 struct sbp2_target
*tgt
= lu
->tgt
;
723 struct fw_card
*card
= fw_device(tgt
->unit
->device
.parent
)->card
;
724 struct Scsi_Host
*shost
=
725 container_of((void *)tgt
, struct Scsi_Host
, hostdata
[0]);
727 bool unblock
= false;
729 spin_lock_irqsave(&card
->lock
, flags
);
730 if (lu
->blocked
&& lu
->generation
== card
->generation
) {
732 unblock
= --tgt
->blocked
== 0;
734 spin_unlock_irqrestore(&card
->lock
, flags
);
737 scsi_unblock_requests(shost
);
741 * Prevents future blocking of tgt and unblocks it.
742 * Note, it is harmless to run scsi_unblock_requests() outside the
743 * card->lock protected section. On the other hand, running it inside
744 * the section might clash with shost->host_lock.
746 static void sbp2_unblock(struct sbp2_target
*tgt
)
748 struct fw_card
*card
= fw_device(tgt
->unit
->device
.parent
)->card
;
749 struct Scsi_Host
*shost
=
750 container_of((void *)tgt
, struct Scsi_Host
, hostdata
[0]);
753 spin_lock_irqsave(&card
->lock
, flags
);
755 spin_unlock_irqrestore(&card
->lock
, flags
);
757 scsi_unblock_requests(shost
);
760 static int sbp2_lun2int(u16 lun
)
762 struct scsi_lun eight_bytes_lun
;
764 memset(&eight_bytes_lun
, 0, sizeof(eight_bytes_lun
));
765 eight_bytes_lun
.scsi_lun
[0] = (lun
>> 8) & 0xff;
766 eight_bytes_lun
.scsi_lun
[1] = lun
& 0xff;
768 return scsilun_to_int(&eight_bytes_lun
);
771 static void sbp2_release_target(struct kref
*kref
)
773 struct sbp2_target
*tgt
= container_of(kref
, struct sbp2_target
, kref
);
774 struct sbp2_logical_unit
*lu
, *next
;
775 struct Scsi_Host
*shost
=
776 container_of((void *)tgt
, struct Scsi_Host
, hostdata
[0]);
777 struct scsi_device
*sdev
;
778 struct fw_device
*device
= fw_device(tgt
->unit
->device
.parent
);
780 /* prevent deadlocks */
783 list_for_each_entry_safe(lu
, next
, &tgt
->lu_list
, link
) {
784 sdev
= scsi_device_lookup(shost
, 0, 0, sbp2_lun2int(lu
->lun
));
786 scsi_remove_device(sdev
);
787 scsi_device_put(sdev
);
789 if (lu
->login_id
!= INVALID_LOGIN_ID
) {
790 int generation
, node_id
;
792 * tgt->node_id may be obsolete here if we failed
793 * during initial login or after a bus reset where
794 * the topology changed.
796 generation
= device
->generation
;
797 smp_rmb(); /* node_id vs. generation */
798 node_id
= device
->node_id
;
799 sbp2_send_management_orb(lu
, node_id
, generation
,
803 fw_core_remove_address_handler(&lu
->address_handler
);
807 scsi_remove_host(shost
);
808 fw_notify("released %s, target %d:0:0\n", tgt
->bus_id
, shost
->host_no
);
810 fw_unit_put(tgt
->unit
);
811 scsi_host_put(shost
);
812 fw_device_put(device
);
815 static struct workqueue_struct
*sbp2_wq
;
817 static void sbp2_target_put(struct sbp2_target
*tgt
)
819 kref_put(&tgt
->kref
, sbp2_release_target
);
823 * Always get the target's kref when scheduling work on one its units.
824 * Each workqueue job is responsible to call sbp2_target_put() upon return.
826 static void sbp2_queue_work(struct sbp2_logical_unit
*lu
, unsigned long delay
)
828 kref_get(&lu
->tgt
->kref
);
829 if (!queue_delayed_work(sbp2_wq
, &lu
->work
, delay
))
830 sbp2_target_put(lu
->tgt
);
834 * Write retransmit retry values into the BUSY_TIMEOUT register.
835 * - The single-phase retry protocol is supported by all SBP-2 devices, but the
836 * default retry_limit value is 0 (i.e. never retry transmission). We write a
837 * saner value after logging into the device.
838 * - The dual-phase retry protocol is optional to implement, and if not
839 * supported, writes to the dual-phase portion of the register will be
840 * ignored. We try to write the original 1394-1995 default here.
841 * - In the case of devices that are also SBP-3-compliant, all writes are
842 * ignored, as the register is read-only, but contains single-phase retry of
843 * 15, which is what we're trying to set for all SBP-2 device anyway, so this
844 * write attempt is safe and yields more consistent behavior for all devices.
846 * See section 8.3.2.3.5 of the 1394-1995 spec, section 6.2 of the SBP-2 spec,
847 * and section 6.4 of the SBP-3 spec for further details.
849 static void sbp2_set_busy_timeout(struct sbp2_logical_unit
*lu
)
851 struct fw_device
*device
= fw_device(lu
->tgt
->unit
->device
.parent
);
852 __be32 d
= cpu_to_be32(SBP2_CYCLE_LIMIT
| SBP2_RETRY_LIMIT
);
854 fw_run_transaction(device
->card
, TCODE_WRITE_QUADLET_REQUEST
,
855 lu
->tgt
->node_id
, lu
->generation
, device
->max_speed
,
856 CSR_REGISTER_BASE
+ CSR_BUSY_TIMEOUT
,
860 static void sbp2_reconnect(struct work_struct
*work
);
862 static void sbp2_login(struct work_struct
*work
)
864 struct sbp2_logical_unit
*lu
=
865 container_of(work
, struct sbp2_logical_unit
, work
.work
);
866 struct sbp2_target
*tgt
= lu
->tgt
;
867 struct fw_device
*device
= fw_device(tgt
->unit
->device
.parent
);
868 struct Scsi_Host
*shost
;
869 struct scsi_device
*sdev
;
870 struct sbp2_login_response response
;
871 int generation
, node_id
, local_node_id
;
873 if (fw_device_is_shutdown(device
))
876 generation
= device
->generation
;
877 smp_rmb(); /* node IDs must not be older than generation */
878 node_id
= device
->node_id
;
879 local_node_id
= device
->card
->node_id
;
881 /* If this is a re-login attempt, log out, or we might be rejected. */
883 sbp2_send_management_orb(lu
, device
->node_id
, generation
,
884 SBP2_LOGOUT_REQUEST
, lu
->login_id
, NULL
);
886 if (sbp2_send_management_orb(lu
, node_id
, generation
,
887 SBP2_LOGIN_REQUEST
, lu
->lun
, &response
) < 0) {
888 if (lu
->retries
++ < 5) {
889 sbp2_queue_work(lu
, DIV_ROUND_UP(HZ
, 5));
891 fw_error("%s: failed to login to LUN %04x\n",
892 tgt
->bus_id
, lu
->lun
);
893 /* Let any waiting I/O fail from now on. */
894 sbp2_unblock(lu
->tgt
);
899 tgt
->node_id
= node_id
;
900 tgt
->address_high
= local_node_id
<< 16;
901 smp_wmb(); /* node IDs must not be older than generation */
902 lu
->generation
= generation
;
904 lu
->command_block_agent_address
=
905 ((u64
)(be32_to_cpu(response
.command_block_agent
.high
) & 0xffff)
906 << 32) | be32_to_cpu(response
.command_block_agent
.low
);
907 lu
->login_id
= be32_to_cpu(response
.misc
) & 0xffff;
909 fw_notify("%s: logged in to LUN %04x (%d retries)\n",
910 tgt
->bus_id
, lu
->lun
, lu
->retries
);
912 /* set appropriate retry limit(s) in BUSY_TIMEOUT register */
913 sbp2_set_busy_timeout(lu
);
915 PREPARE_DELAYED_WORK(&lu
->work
, sbp2_reconnect
);
916 sbp2_agent_reset(lu
);
918 /* This was a re-login. */
920 sbp2_cancel_orbs(lu
);
921 sbp2_conditionally_unblock(lu
);
925 if (lu
->tgt
->workarounds
& SBP2_WORKAROUND_DELAY_INQUIRY
)
926 ssleep(SBP2_INQUIRY_DELAY
);
928 shost
= container_of((void *)tgt
, struct Scsi_Host
, hostdata
[0]);
929 sdev
= __scsi_add_device(shost
, 0, 0, sbp2_lun2int(lu
->lun
), lu
);
931 * FIXME: We are unable to perform reconnects while in sbp2_login().
932 * Therefore __scsi_add_device() will get into trouble if a bus reset
933 * happens in parallel. It will either fail or leave us with an
934 * unusable sdev. As a workaround we check for this and retry the
935 * whole login and SCSI probing.
938 /* Reported error during __scsi_add_device() */
940 goto out_logout_login
;
942 /* Unreported error during __scsi_add_device() */
943 smp_rmb(); /* get current card generation */
944 if (generation
!= device
->card
->generation
) {
945 scsi_remove_device(sdev
);
946 scsi_device_put(sdev
);
947 goto out_logout_login
;
950 /* No error during __scsi_add_device() */
952 scsi_device_put(sdev
);
953 sbp2_allow_block(lu
);
957 smp_rmb(); /* generation may have changed */
958 generation
= device
->generation
;
959 smp_rmb(); /* node_id must not be older than generation */
961 sbp2_send_management_orb(lu
, device
->node_id
, generation
,
962 SBP2_LOGOUT_REQUEST
, lu
->login_id
, NULL
);
964 * If a bus reset happened, sbp2_update will have requeued
965 * lu->work already. Reset the work from reconnect to login.
967 PREPARE_DELAYED_WORK(&lu
->work
, sbp2_login
);
969 sbp2_target_put(tgt
);
972 static int sbp2_add_logical_unit(struct sbp2_target
*tgt
, int lun_entry
)
974 struct sbp2_logical_unit
*lu
;
976 lu
= kmalloc(sizeof(*lu
), GFP_KERNEL
);
980 lu
->address_handler
.length
= 0x100;
981 lu
->address_handler
.address_callback
= sbp2_status_write
;
982 lu
->address_handler
.callback_data
= lu
;
984 if (fw_core_add_address_handler(&lu
->address_handler
,
985 &fw_high_memory_region
) < 0) {
991 lu
->lun
= lun_entry
& 0xffff;
992 lu
->login_id
= INVALID_LOGIN_ID
;
994 lu
->has_sdev
= false;
997 INIT_LIST_HEAD(&lu
->orb_list
);
998 INIT_DELAYED_WORK(&lu
->work
, sbp2_login
);
1000 list_add_tail(&lu
->link
, &tgt
->lu_list
);
1004 static int sbp2_scan_logical_unit_dir(struct sbp2_target
*tgt
, u32
*directory
)
1006 struct fw_csr_iterator ci
;
1009 fw_csr_iterator_init(&ci
, directory
);
1010 while (fw_csr_iterator_next(&ci
, &key
, &value
))
1011 if (key
== SBP2_CSR_LOGICAL_UNIT_NUMBER
&&
1012 sbp2_add_logical_unit(tgt
, value
) < 0)
1017 static int sbp2_scan_unit_dir(struct sbp2_target
*tgt
, u32
*directory
,
1018 u32
*model
, u32
*firmware_revision
)
1020 struct fw_csr_iterator ci
;
1022 unsigned int timeout
;
1024 fw_csr_iterator_init(&ci
, directory
);
1025 while (fw_csr_iterator_next(&ci
, &key
, &value
)) {
1028 case CSR_DEPENDENT_INFO
| CSR_OFFSET
:
1029 tgt
->management_agent_address
=
1030 CSR_REGISTER_BASE
+ 4 * value
;
1033 case CSR_DIRECTORY_ID
:
1034 tgt
->directory_id
= value
;
1041 case SBP2_CSR_FIRMWARE_REVISION
:
1042 *firmware_revision
= value
;
1045 case SBP2_CSR_UNIT_CHARACTERISTICS
:
1046 /* the timeout value is stored in 500ms units */
1047 timeout
= ((unsigned int) value
>> 8 & 0xff) * 500;
1048 timeout
= max(timeout
, SBP2_MIN_LOGIN_ORB_TIMEOUT
);
1049 tgt
->mgt_orb_timeout
=
1050 min(timeout
, SBP2_MAX_LOGIN_ORB_TIMEOUT
);
1052 if (timeout
> tgt
->mgt_orb_timeout
)
1053 fw_notify("%s: config rom contains %ds "
1054 "management ORB timeout, limiting "
1055 "to %ds\n", tgt
->bus_id
,
1057 tgt
->mgt_orb_timeout
/ 1000);
1060 case SBP2_CSR_LOGICAL_UNIT_NUMBER
:
1061 if (sbp2_add_logical_unit(tgt
, value
) < 0)
1065 case SBP2_CSR_LOGICAL_UNIT_DIRECTORY
:
1066 /* Adjust for the increment in the iterator */
1067 if (sbp2_scan_logical_unit_dir(tgt
, ci
.p
- 1 + value
) < 0)
1075 static void sbp2_init_workarounds(struct sbp2_target
*tgt
, u32 model
,
1076 u32 firmware_revision
)
1079 unsigned int w
= sbp2_param_workarounds
;
1082 fw_notify("Please notify linux1394-devel@lists.sourceforge.net "
1083 "if you need the workarounds parameter for %s\n",
1086 if (w
& SBP2_WORKAROUND_OVERRIDE
)
1089 for (i
= 0; i
< ARRAY_SIZE(sbp2_workarounds_table
); i
++) {
1091 if (sbp2_workarounds_table
[i
].firmware_revision
!=
1092 (firmware_revision
& 0xffffff00))
1095 if (sbp2_workarounds_table
[i
].model
!= model
&&
1096 sbp2_workarounds_table
[i
].model
!= ~0)
1099 w
|= sbp2_workarounds_table
[i
].workarounds
;
1104 fw_notify("Workarounds for %s: 0x%x "
1105 "(firmware_revision 0x%06x, model_id 0x%06x)\n",
1106 tgt
->bus_id
, w
, firmware_revision
, model
);
1107 tgt
->workarounds
= w
;
1110 static struct scsi_host_template scsi_driver_template
;
1112 static int sbp2_probe(struct device
*dev
)
1114 struct fw_unit
*unit
= fw_unit(dev
);
1115 struct fw_device
*device
= fw_device(unit
->device
.parent
);
1116 struct sbp2_target
*tgt
;
1117 struct sbp2_logical_unit
*lu
;
1118 struct Scsi_Host
*shost
;
1119 u32 model
, firmware_revision
;
1121 if (dma_get_max_seg_size(device
->card
->device
) > SBP2_MAX_SEG_SIZE
)
1122 BUG_ON(dma_set_max_seg_size(device
->card
->device
,
1123 SBP2_MAX_SEG_SIZE
));
1125 shost
= scsi_host_alloc(&scsi_driver_template
, sizeof(*tgt
));
1129 tgt
= (struct sbp2_target
*)shost
->hostdata
;
1130 unit
->device
.driver_data
= tgt
;
1132 kref_init(&tgt
->kref
);
1133 INIT_LIST_HEAD(&tgt
->lu_list
);
1134 tgt
->bus_id
= dev_name(&unit
->device
);
1135 tgt
->guid
= (u64
)device
->config_rom
[3] << 32 | device
->config_rom
[4];
1137 if (fw_device_enable_phys_dma(device
) < 0)
1138 goto fail_shost_put
;
1140 if (scsi_add_host(shost
, &unit
->device
) < 0)
1141 goto fail_shost_put
;
1143 fw_device_get(device
);
1146 /* Initialize to values that won't match anything in our table. */
1147 firmware_revision
= 0xff000000;
1150 /* implicit directory ID */
1151 tgt
->directory_id
= ((unit
->directory
- device
->config_rom
) * 4
1152 + CSR_CONFIG_ROM
) & 0xffffff;
1154 if (sbp2_scan_unit_dir(tgt
, unit
->directory
, &model
,
1155 &firmware_revision
) < 0)
1158 sbp2_init_workarounds(tgt
, model
, firmware_revision
);
1161 * At S100 we can do 512 bytes per packet, at S200 1024 bytes,
1162 * and so on up to 4096 bytes. The SBP-2 max_payload field
1163 * specifies the max payload size as 2 ^ (max_payload + 2), so
1164 * if we set this to max_speed + 7, we get the right value.
1166 tgt
->max_payload
= min(device
->max_speed
+ 7, 10U);
1167 tgt
->max_payload
= min(tgt
->max_payload
, device
->card
->max_receive
- 1);
1169 /* Do the login in a workqueue so we can easily reschedule retries. */
1170 list_for_each_entry(lu
, &tgt
->lu_list
, link
)
1171 sbp2_queue_work(lu
, DIV_ROUND_UP(HZ
, 5));
1175 sbp2_target_put(tgt
);
1179 scsi_host_put(shost
);
1183 static int sbp2_remove(struct device
*dev
)
1185 struct fw_unit
*unit
= fw_unit(dev
);
1186 struct sbp2_target
*tgt
= unit
->device
.driver_data
;
1188 sbp2_target_put(tgt
);
1192 static void sbp2_reconnect(struct work_struct
*work
)
1194 struct sbp2_logical_unit
*lu
=
1195 container_of(work
, struct sbp2_logical_unit
, work
.work
);
1196 struct sbp2_target
*tgt
= lu
->tgt
;
1197 struct fw_device
*device
= fw_device(tgt
->unit
->device
.parent
);
1198 int generation
, node_id
, local_node_id
;
1200 if (fw_device_is_shutdown(device
))
1203 generation
= device
->generation
;
1204 smp_rmb(); /* node IDs must not be older than generation */
1205 node_id
= device
->node_id
;
1206 local_node_id
= device
->card
->node_id
;
1208 if (sbp2_send_management_orb(lu
, node_id
, generation
,
1209 SBP2_RECONNECT_REQUEST
,
1210 lu
->login_id
, NULL
) < 0) {
1212 * If reconnect was impossible even though we are in the
1213 * current generation, fall back and try to log in again.
1215 * We could check for "Function rejected" status, but
1216 * looking at the bus generation as simpler and more general.
1218 smp_rmb(); /* get current card generation */
1219 if (generation
== device
->card
->generation
||
1220 lu
->retries
++ >= 5) {
1221 fw_error("%s: failed to reconnect\n", tgt
->bus_id
);
1223 PREPARE_DELAYED_WORK(&lu
->work
, sbp2_login
);
1225 sbp2_queue_work(lu
, DIV_ROUND_UP(HZ
, 5));
1229 tgt
->node_id
= node_id
;
1230 tgt
->address_high
= local_node_id
<< 16;
1231 smp_wmb(); /* node IDs must not be older than generation */
1232 lu
->generation
= generation
;
1234 fw_notify("%s: reconnected to LUN %04x (%d retries)\n",
1235 tgt
->bus_id
, lu
->lun
, lu
->retries
);
1237 sbp2_agent_reset(lu
);
1238 sbp2_cancel_orbs(lu
);
1239 sbp2_conditionally_unblock(lu
);
1241 sbp2_target_put(tgt
);
1244 static void sbp2_update(struct fw_unit
*unit
)
1246 struct sbp2_target
*tgt
= unit
->device
.driver_data
;
1247 struct sbp2_logical_unit
*lu
;
1249 fw_device_enable_phys_dma(fw_device(unit
->device
.parent
));
1252 * Fw-core serializes sbp2_update() against sbp2_remove().
1253 * Iteration over tgt->lu_list is therefore safe here.
1255 list_for_each_entry(lu
, &tgt
->lu_list
, link
) {
1256 sbp2_conditionally_block(lu
);
1258 sbp2_queue_work(lu
, 0);
1262 #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
1263 #define SBP2_SW_VERSION_ENTRY 0x00010483
1265 static const struct fw_device_id sbp2_id_table
[] = {
1267 .match_flags
= FW_MATCH_SPECIFIER_ID
| FW_MATCH_VERSION
,
1268 .specifier_id
= SBP2_UNIT_SPEC_ID_ENTRY
,
1269 .version
= SBP2_SW_VERSION_ENTRY
,
1274 static struct fw_driver sbp2_driver
= {
1276 .owner
= THIS_MODULE
,
1277 .name
= sbp2_driver_name
,
1278 .bus
= &fw_bus_type
,
1279 .probe
= sbp2_probe
,
1280 .remove
= sbp2_remove
,
1282 .update
= sbp2_update
,
1283 .id_table
= sbp2_id_table
,
1287 sbp2_status_to_sense_data(u8
*sbp2_status
, u8
*sense_data
)
1291 sense_data
[0] = 0x70;
1292 sense_data
[1] = 0x0;
1293 sense_data
[2] = sbp2_status
[1];
1294 sense_data
[3] = sbp2_status
[4];
1295 sense_data
[4] = sbp2_status
[5];
1296 sense_data
[5] = sbp2_status
[6];
1297 sense_data
[6] = sbp2_status
[7];
1299 sense_data
[8] = sbp2_status
[8];
1300 sense_data
[9] = sbp2_status
[9];
1301 sense_data
[10] = sbp2_status
[10];
1302 sense_data
[11] = sbp2_status
[11];
1303 sense_data
[12] = sbp2_status
[2];
1304 sense_data
[13] = sbp2_status
[3];
1305 sense_data
[14] = sbp2_status
[12];
1306 sense_data
[15] = sbp2_status
[13];
1308 sam_status
= sbp2_status
[0] & 0x3f;
1310 switch (sam_status
) {
1312 case SAM_STAT_CHECK_CONDITION
:
1313 case SAM_STAT_CONDITION_MET
:
1315 case SAM_STAT_RESERVATION_CONFLICT
:
1316 case SAM_STAT_COMMAND_TERMINATED
:
1317 return DID_OK
<< 16 | sam_status
;
1320 return DID_ERROR
<< 16;
1325 complete_command_orb(struct sbp2_orb
*base_orb
, struct sbp2_status
*status
)
1327 struct sbp2_command_orb
*orb
=
1328 container_of(base_orb
, struct sbp2_command_orb
, base
);
1329 struct fw_device
*device
= fw_device(orb
->lu
->tgt
->unit
->device
.parent
);
1332 if (status
!= NULL
) {
1333 if (STATUS_GET_DEAD(*status
))
1334 sbp2_agent_reset_no_wait(orb
->lu
);
1336 switch (STATUS_GET_RESPONSE(*status
)) {
1337 case SBP2_STATUS_REQUEST_COMPLETE
:
1338 result
= DID_OK
<< 16;
1340 case SBP2_STATUS_TRANSPORT_FAILURE
:
1341 result
= DID_BUS_BUSY
<< 16;
1343 case SBP2_STATUS_ILLEGAL_REQUEST
:
1344 case SBP2_STATUS_VENDOR_DEPENDENT
:
1346 result
= DID_ERROR
<< 16;
1350 if (result
== DID_OK
<< 16 && STATUS_GET_LEN(*status
) > 1)
1351 result
= sbp2_status_to_sense_data(STATUS_GET_DATA(*status
),
1352 orb
->cmd
->sense_buffer
);
1355 * If the orb completes with status == NULL, something
1356 * went wrong, typically a bus reset happened mid-orb
1357 * or when sending the write (less likely).
1359 result
= DID_BUS_BUSY
<< 16;
1360 sbp2_conditionally_block(orb
->lu
);
1363 dma_unmap_single(device
->card
->device
, orb
->base
.request_bus
,
1364 sizeof(orb
->request
), DMA_TO_DEVICE
);
1366 if (scsi_sg_count(orb
->cmd
) > 0)
1367 dma_unmap_sg(device
->card
->device
, scsi_sglist(orb
->cmd
),
1368 scsi_sg_count(orb
->cmd
),
1369 orb
->cmd
->sc_data_direction
);
1371 if (orb
->page_table_bus
!= 0)
1372 dma_unmap_single(device
->card
->device
, orb
->page_table_bus
,
1373 sizeof(orb
->page_table
), DMA_TO_DEVICE
);
1375 orb
->cmd
->result
= result
;
1376 orb
->done(orb
->cmd
);
1380 sbp2_map_scatterlist(struct sbp2_command_orb
*orb
, struct fw_device
*device
,
1381 struct sbp2_logical_unit
*lu
)
1383 struct scatterlist
*sg
= scsi_sglist(orb
->cmd
);
1386 n
= dma_map_sg(device
->card
->device
, sg
, scsi_sg_count(orb
->cmd
),
1387 orb
->cmd
->sc_data_direction
);
1392 * Handle the special case where there is only one element in
1393 * the scatter list by converting it to an immediate block
1394 * request. This is also a workaround for broken devices such
1395 * as the second generation iPod which doesn't support page
1399 orb
->request
.data_descriptor
.high
=
1400 cpu_to_be32(lu
->tgt
->address_high
);
1401 orb
->request
.data_descriptor
.low
=
1402 cpu_to_be32(sg_dma_address(sg
));
1403 orb
->request
.misc
|=
1404 cpu_to_be32(COMMAND_ORB_DATA_SIZE(sg_dma_len(sg
)));
1408 for_each_sg(sg
, sg
, n
, i
) {
1409 orb
->page_table
[i
].high
= cpu_to_be32(sg_dma_len(sg
) << 16);
1410 orb
->page_table
[i
].low
= cpu_to_be32(sg_dma_address(sg
));
1413 orb
->page_table_bus
=
1414 dma_map_single(device
->card
->device
, orb
->page_table
,
1415 sizeof(orb
->page_table
), DMA_TO_DEVICE
);
1416 if (dma_mapping_error(device
->card
->device
, orb
->page_table_bus
))
1417 goto fail_page_table
;
1420 * The data_descriptor pointer is the one case where we need
1421 * to fill in the node ID part of the address. All other
1422 * pointers assume that the data referenced reside on the
1423 * initiator (i.e. us), but data_descriptor can refer to data
1424 * on other nodes so we need to put our ID in descriptor.high.
1426 orb
->request
.data_descriptor
.high
= cpu_to_be32(lu
->tgt
->address_high
);
1427 orb
->request
.data_descriptor
.low
= cpu_to_be32(orb
->page_table_bus
);
1428 orb
->request
.misc
|= cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT
|
1429 COMMAND_ORB_DATA_SIZE(n
));
1434 dma_unmap_sg(device
->card
->device
, scsi_sglist(orb
->cmd
),
1435 scsi_sg_count(orb
->cmd
), orb
->cmd
->sc_data_direction
);
1440 /* SCSI stack integration */
1442 static int sbp2_scsi_queuecommand(struct scsi_cmnd
*cmd
, scsi_done_fn_t done
)
1444 struct sbp2_logical_unit
*lu
= cmd
->device
->hostdata
;
1445 struct fw_device
*device
= fw_device(lu
->tgt
->unit
->device
.parent
);
1446 struct sbp2_command_orb
*orb
;
1447 int generation
, retval
= SCSI_MLQUEUE_HOST_BUSY
;
1450 * Bidirectional commands are not yet implemented, and unknown
1451 * transfer direction not handled.
1453 if (cmd
->sc_data_direction
== DMA_BIDIRECTIONAL
) {
1454 fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n");
1455 cmd
->result
= DID_ERROR
<< 16;
1460 orb
= kzalloc(sizeof(*orb
), GFP_ATOMIC
);
1462 fw_notify("failed to alloc orb\n");
1463 return SCSI_MLQUEUE_HOST_BUSY
;
1466 /* Initialize rcode to something not RCODE_COMPLETE. */
1467 orb
->base
.rcode
= -1;
1468 kref_init(&orb
->base
.kref
);
1474 orb
->request
.next
.high
= cpu_to_be32(SBP2_ORB_NULL
);
1475 orb
->request
.misc
= cpu_to_be32(
1476 COMMAND_ORB_MAX_PAYLOAD(lu
->tgt
->max_payload
) |
1477 COMMAND_ORB_SPEED(device
->max_speed
) |
1478 COMMAND_ORB_NOTIFY
);
1480 if (cmd
->sc_data_direction
== DMA_FROM_DEVICE
)
1481 orb
->request
.misc
|= cpu_to_be32(COMMAND_ORB_DIRECTION
);
1483 generation
= device
->generation
;
1484 smp_rmb(); /* sbp2_map_scatterlist looks at tgt->address_high */
1486 if (scsi_sg_count(cmd
) && sbp2_map_scatterlist(orb
, device
, lu
) < 0)
1489 memcpy(orb
->request
.command_block
, cmd
->cmnd
, cmd
->cmd_len
);
1491 orb
->base
.callback
= complete_command_orb
;
1492 orb
->base
.request_bus
=
1493 dma_map_single(device
->card
->device
, &orb
->request
,
1494 sizeof(orb
->request
), DMA_TO_DEVICE
);
1495 if (dma_mapping_error(device
->card
->device
, orb
->base
.request_bus
))
1498 sbp2_send_orb(&orb
->base
, lu
, lu
->tgt
->node_id
, generation
,
1499 lu
->command_block_agent_address
+ SBP2_ORB_POINTER
);
1502 kref_put(&orb
->base
.kref
, free_orb
);
1506 static int sbp2_scsi_slave_alloc(struct scsi_device
*sdev
)
1508 struct sbp2_logical_unit
*lu
= sdev
->hostdata
;
1510 /* (Re-)Adding logical units via the SCSI stack is not supported. */
1514 sdev
->allow_restart
= 1;
1516 /* SBP-2 requires quadlet alignment of the data buffers. */
1517 blk_queue_update_dma_alignment(sdev
->request_queue
, 4 - 1);
1519 if (lu
->tgt
->workarounds
& SBP2_WORKAROUND_INQUIRY_36
)
1520 sdev
->inquiry_len
= 36;
1525 static int sbp2_scsi_slave_configure(struct scsi_device
*sdev
)
1527 struct sbp2_logical_unit
*lu
= sdev
->hostdata
;
1529 sdev
->use_10_for_rw
= 1;
1531 if (sbp2_param_exclusive_login
)
1532 sdev
->manage_start_stop
= 1;
1534 if (sdev
->type
== TYPE_ROM
)
1535 sdev
->use_10_for_ms
= 1;
1537 if (sdev
->type
== TYPE_DISK
&&
1538 lu
->tgt
->workarounds
& SBP2_WORKAROUND_MODE_SENSE_8
)
1539 sdev
->skip_ms_page_8
= 1;
1541 if (lu
->tgt
->workarounds
& SBP2_WORKAROUND_FIX_CAPACITY
)
1542 sdev
->fix_capacity
= 1;
1544 if (lu
->tgt
->workarounds
& SBP2_WORKAROUND_POWER_CONDITION
)
1545 sdev
->start_stop_pwr_cond
= 1;
1547 if (lu
->tgt
->workarounds
& SBP2_WORKAROUND_128K_MAX_TRANS
)
1548 blk_queue_max_sectors(sdev
->request_queue
, 128 * 1024 / 512);
1550 blk_queue_max_segment_size(sdev
->request_queue
, SBP2_MAX_SEG_SIZE
);
1556 * Called by scsi stack when something has really gone wrong. Usually
1557 * called when a command has timed-out for some reason.
1559 static int sbp2_scsi_abort(struct scsi_cmnd
*cmd
)
1561 struct sbp2_logical_unit
*lu
= cmd
->device
->hostdata
;
1563 fw_notify("%s: sbp2_scsi_abort\n", lu
->tgt
->bus_id
);
1564 sbp2_agent_reset(lu
);
1565 sbp2_cancel_orbs(lu
);
1571 * Format of /sys/bus/scsi/devices/.../ieee1394_id:
1572 * u64 EUI-64 : u24 directory_ID : u16 LUN (all printed in hexadecimal)
1574 * This is the concatenation of target port identifier and logical unit
1575 * identifier as per SAM-2...SAM-4 annex A.
1578 sbp2_sysfs_ieee1394_id_show(struct device
*dev
, struct device_attribute
*attr
,
1581 struct scsi_device
*sdev
= to_scsi_device(dev
);
1582 struct sbp2_logical_unit
*lu
;
1587 lu
= sdev
->hostdata
;
1589 return sprintf(buf
, "%016llx:%06x:%04x\n",
1590 (unsigned long long)lu
->tgt
->guid
,
1591 lu
->tgt
->directory_id
, lu
->lun
);
1594 static DEVICE_ATTR(ieee1394_id
, S_IRUGO
, sbp2_sysfs_ieee1394_id_show
, NULL
);
1596 static struct device_attribute
*sbp2_scsi_sysfs_attrs
[] = {
1597 &dev_attr_ieee1394_id
,
1601 static struct scsi_host_template scsi_driver_template
= {
1602 .module
= THIS_MODULE
,
1603 .name
= "SBP-2 IEEE-1394",
1604 .proc_name
= sbp2_driver_name
,
1605 .queuecommand
= sbp2_scsi_queuecommand
,
1606 .slave_alloc
= sbp2_scsi_slave_alloc
,
1607 .slave_configure
= sbp2_scsi_slave_configure
,
1608 .eh_abort_handler
= sbp2_scsi_abort
,
1610 .sg_tablesize
= SG_ALL
,
1611 .use_clustering
= ENABLE_CLUSTERING
,
1614 .sdev_attrs
= sbp2_scsi_sysfs_attrs
,
1617 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
1618 MODULE_DESCRIPTION("SCSI over IEEE1394");
1619 MODULE_LICENSE("GPL");
1620 MODULE_DEVICE_TABLE(ieee1394
, sbp2_id_table
);
1622 /* Provide a module alias so root-on-sbp2 initrds don't break. */
1623 #ifndef CONFIG_IEEE1394_SBP2_MODULE
1624 MODULE_ALIAS("sbp2");
1627 static int __init
sbp2_init(void)
1629 sbp2_wq
= create_singlethread_workqueue(KBUILD_MODNAME
);
1633 return driver_register(&sbp2_driver
.driver
);
1636 static void __exit
sbp2_cleanup(void)
1638 driver_unregister(&sbp2_driver
.driver
);
1639 destroy_workqueue(sbp2_wq
);
1642 module_init(sbp2_init
);
1643 module_exit(sbp2_cleanup
);