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/completion.h>
34 #include <linux/delay.h>
35 #include <linux/device.h>
36 #include <linux/dma-mapping.h>
37 #include <linux/firewire.h>
38 #include <linux/firewire-constants.h>
39 #include <linux/init.h>
40 #include <linux/jiffies.h>
41 #include <linux/kernel.h>
42 #include <linux/kref.h>
43 #include <linux/list.h>
44 #include <linux/mod_devicetable.h>
45 #include <linux/module.h>
46 #include <linux/moduleparam.h>
47 #include <linux/scatterlist.h>
48 #include <linux/slab.h>
49 #include <linux/spinlock.h>
50 #include <linux/string.h>
51 #include <linux/stringify.h>
52 #include <linux/workqueue.h>
54 #include <asm/byteorder.h>
55 #include <asm/system.h>
57 #include <scsi/scsi.h>
58 #include <scsi/scsi_cmnd.h>
59 #include <scsi/scsi_device.h>
60 #include <scsi/scsi_host.h>
63 * So far only bridges from Oxford Semiconductor are known to support
64 * concurrent logins. Depending on firmware, four or two concurrent logins
65 * are possible on OXFW911 and newer Oxsemi bridges.
67 * Concurrent logins are useful together with cluster filesystems.
69 static int sbp2_param_exclusive_login = 1;
70 module_param_named(exclusive_login, sbp2_param_exclusive_login, bool, 0644);
71 MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device "
72 "(default = Y, use N for concurrent initiators)");
75 * Flags for firmware oddities
77 * - 128kB max transfer
78 * Limit transfer size. Necessary for some old bridges.
81 * When scsi_mod probes the device, let the inquiry command look like that
85 * Suppress sending of mode_sense for mode page 8 if the device pretends to
86 * support the SCSI Primary Block commands instead of Reduced Block Commands.
89 * Tell sd_mod to correct the last sector number reported by read_capacity.
90 * Avoids access beyond actual disk limits on devices with an off-by-one bug.
91 * Don't use this with devices which don't have this bug.
94 * Wait extra SBP2_INQUIRY_DELAY seconds after login before SCSI inquiry.
97 * Set the power condition field in the START STOP UNIT commands sent by
98 * sd_mod on suspend, resume, and shutdown (if manage_start_stop is on).
99 * Some disks need this to spin down or to resume properly.
101 * - override internal blacklist
102 * Instead of adding to the built-in blacklist, use only the workarounds
103 * specified in the module load parameter.
104 * Useful if a blacklist entry interfered with a non-broken device.
106 #define SBP2_WORKAROUND_128K_MAX_TRANS 0x1
107 #define SBP2_WORKAROUND_INQUIRY_36 0x2
108 #define SBP2_WORKAROUND_MODE_SENSE_8 0x4
109 #define SBP2_WORKAROUND_FIX_CAPACITY 0x8
110 #define SBP2_WORKAROUND_DELAY_INQUIRY 0x10
111 #define SBP2_INQUIRY_DELAY 12
112 #define SBP2_WORKAROUND_POWER_CONDITION 0x20
113 #define SBP2_WORKAROUND_OVERRIDE 0x100
115 static int sbp2_param_workarounds;
116 module_param_named(workarounds, sbp2_param_workarounds, int, 0644);
117 MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0"
118 ", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS)
119 ", 36 byte inquiry = " __stringify(SBP2_WORKAROUND_INQUIRY_36)
120 ", skip mode page 8 = " __stringify(SBP2_WORKAROUND_MODE_SENSE_8)
121 ", fix capacity = " __stringify(SBP2_WORKAROUND_FIX_CAPACITY)
122 ", delay inquiry = " __stringify(SBP2_WORKAROUND_DELAY_INQUIRY)
123 ", set power condition in start stop unit = "
124 __stringify(SBP2_WORKAROUND_POWER_CONDITION)
125 ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE)
126 ", or a combination)");
128 static const char sbp2_driver_name[] = "sbp2";
131 * We create one struct sbp2_logical_unit per SBP-2 Logical Unit Number Entry
132 * and one struct scsi_device per sbp2_logical_unit.
134 struct sbp2_logical_unit {
135 struct sbp2_target *tgt;
136 struct list_head link;
137 struct fw_address_handler address_handler;
138 struct list_head orb_list;
140 u64 command_block_agent_address;
145 * The generation is updated once we've logged in or reconnected
146 * to the logical unit. Thus, I/O to the device will automatically
147 * fail and get retried if it happens in a window where the device
148 * is not ready, e.g. after a bus reset but before we reconnect.
152 struct delayed_work work;
158 * We create one struct sbp2_target per IEEE 1212 Unit Directory
159 * and one struct Scsi_Host per sbp2_target.
162 struct fw_unit *unit;
164 struct list_head lu_list;
166 u64 management_agent_address;
171 unsigned int workarounds;
172 unsigned int mgt_orb_timeout;
173 unsigned int max_payload;
175 int dont_block; /* counter for each logical unit */
176 int blocked; /* ditto */
179 static struct fw_device *target_device(struct sbp2_target *tgt)
181 return fw_parent_device(tgt->unit);
184 /* Impossible login_id, to detect logout attempt before successful login */
185 #define INVALID_LOGIN_ID 0x10000
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 * There is no transport protocol limit to the CDB length, but we implement
194 * a fixed length only. 16 bytes is enough for disks larger than 2 TB.
196 #define SBP2_MAX_CDB_SIZE 16
199 * The default maximum s/g segment size of a FireWire controller is
200 * usually 0x10000, but SBP-2 only allows 0xffff. Since buffers have to
201 * be quadlet-aligned, we set the length limit to 0xffff & ~3.
203 #define SBP2_MAX_SEG_SIZE 0xfffc
205 /* Unit directory keys */
206 #define SBP2_CSR_UNIT_CHARACTERISTICS 0x3a
207 #define SBP2_CSR_FIRMWARE_REVISION 0x3c
208 #define SBP2_CSR_LOGICAL_UNIT_NUMBER 0x14
209 #define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4
211 /* Management orb opcodes */
212 #define SBP2_LOGIN_REQUEST 0x0
213 #define SBP2_QUERY_LOGINS_REQUEST 0x1
214 #define SBP2_RECONNECT_REQUEST 0x3
215 #define SBP2_SET_PASSWORD_REQUEST 0x4
216 #define SBP2_LOGOUT_REQUEST 0x7
217 #define SBP2_ABORT_TASK_REQUEST 0xb
218 #define SBP2_ABORT_TASK_SET 0xc
219 #define SBP2_LOGICAL_UNIT_RESET 0xe
220 #define SBP2_TARGET_RESET_REQUEST 0xf
222 /* Offsets for command block agent registers */
223 #define SBP2_AGENT_STATE 0x00
224 #define SBP2_AGENT_RESET 0x04
225 #define SBP2_ORB_POINTER 0x08
226 #define SBP2_DOORBELL 0x10
227 #define SBP2_UNSOLICITED_STATUS_ENABLE 0x14
229 /* Status write response codes */
230 #define SBP2_STATUS_REQUEST_COMPLETE 0x0
231 #define SBP2_STATUS_TRANSPORT_FAILURE 0x1
232 #define SBP2_STATUS_ILLEGAL_REQUEST 0x2
233 #define SBP2_STATUS_VENDOR_DEPENDENT 0x3
235 #define STATUS_GET_ORB_HIGH(v) ((v).status & 0xffff)
236 #define STATUS_GET_SBP_STATUS(v) (((v).status >> 16) & 0xff)
237 #define STATUS_GET_LEN(v) (((v).status >> 24) & 0x07)
238 #define STATUS_GET_DEAD(v) (((v).status >> 27) & 0x01)
239 #define STATUS_GET_RESPONSE(v) (((v).status >> 28) & 0x03)
240 #define STATUS_GET_SOURCE(v) (((v).status >> 30) & 0x03)
241 #define STATUS_GET_ORB_LOW(v) ((v).orb_low)
242 #define STATUS_GET_DATA(v) ((v).data)
250 struct sbp2_pointer {
256 struct fw_transaction t;
258 dma_addr_t request_bus;
260 void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status);
261 struct list_head link;
264 #define MANAGEMENT_ORB_LUN(v) ((v))
265 #define MANAGEMENT_ORB_FUNCTION(v) ((v) << 16)
266 #define MANAGEMENT_ORB_RECONNECT(v) ((v) << 20)
267 #define MANAGEMENT_ORB_EXCLUSIVE(v) ((v) ? 1 << 28 : 0)
268 #define MANAGEMENT_ORB_REQUEST_FORMAT(v) ((v) << 29)
269 #define MANAGEMENT_ORB_NOTIFY ((1) << 31)
271 #define MANAGEMENT_ORB_RESPONSE_LENGTH(v) ((v))
272 #define MANAGEMENT_ORB_PASSWORD_LENGTH(v) ((v) << 16)
274 struct sbp2_management_orb {
275 struct sbp2_orb base;
277 struct sbp2_pointer password;
278 struct sbp2_pointer response;
281 struct sbp2_pointer status_fifo;
284 dma_addr_t response_bus;
285 struct completion done;
286 struct sbp2_status status;
289 struct sbp2_login_response {
291 struct sbp2_pointer command_block_agent;
292 __be32 reconnect_hold;
294 #define COMMAND_ORB_DATA_SIZE(v) ((v))
295 #define COMMAND_ORB_PAGE_SIZE(v) ((v) << 16)
296 #define COMMAND_ORB_PAGE_TABLE_PRESENT ((1) << 19)
297 #define COMMAND_ORB_MAX_PAYLOAD(v) ((v) << 20)
298 #define COMMAND_ORB_SPEED(v) ((v) << 24)
299 #define COMMAND_ORB_DIRECTION ((1) << 27)
300 #define COMMAND_ORB_REQUEST_FORMAT(v) ((v) << 29)
301 #define COMMAND_ORB_NOTIFY ((1) << 31)
303 struct sbp2_command_orb {
304 struct sbp2_orb base;
306 struct sbp2_pointer next;
307 struct sbp2_pointer data_descriptor;
309 u8 command_block[SBP2_MAX_CDB_SIZE];
311 struct scsi_cmnd *cmd;
312 struct sbp2_logical_unit *lu;
314 struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8)));
315 dma_addr_t page_table_bus;
318 #define SBP2_ROM_VALUE_WILDCARD ~0 /* match all */
319 #define SBP2_ROM_VALUE_MISSING 0xff000000 /* not present in the unit dir. */
322 * List of devices with known bugs.
324 * The firmware_revision field, masked with 0xffff00, is the best
325 * indicator for the type of bridge chip of a device. It yields a few
326 * false positives but this did not break correctly behaving devices
329 static const struct {
330 u32 firmware_revision;
332 unsigned int workarounds;
333 } sbp2_workarounds_table[] = {
334 /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
335 .firmware_revision = 0x002800,
337 .workarounds = SBP2_WORKAROUND_INQUIRY_36 |
338 SBP2_WORKAROUND_MODE_SENSE_8 |
339 SBP2_WORKAROUND_POWER_CONDITION,
341 /* DViCO Momobay FX-3A with TSB42AA9A bridge */ {
342 .firmware_revision = 0x002800,
344 .workarounds = SBP2_WORKAROUND_POWER_CONDITION,
346 /* Initio bridges, actually only needed for some older ones */ {
347 .firmware_revision = 0x000200,
348 .model = SBP2_ROM_VALUE_WILDCARD,
349 .workarounds = SBP2_WORKAROUND_INQUIRY_36,
351 /* PL-3507 bridge with Prolific firmware */ {
352 .firmware_revision = 0x012800,
353 .model = SBP2_ROM_VALUE_WILDCARD,
354 .workarounds = SBP2_WORKAROUND_POWER_CONDITION,
356 /* Symbios bridge */ {
357 .firmware_revision = 0xa0b800,
358 .model = SBP2_ROM_VALUE_WILDCARD,
359 .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS,
361 /* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ {
362 .firmware_revision = 0x002600,
363 .model = SBP2_ROM_VALUE_WILDCARD,
364 .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS,
367 * iPod 2nd generation: needs 128k max transfer size workaround
368 * iPod 3rd generation: needs fix capacity workaround
371 .firmware_revision = 0x0a2700,
373 .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS |
374 SBP2_WORKAROUND_FIX_CAPACITY,
376 /* iPod 4th generation */ {
377 .firmware_revision = 0x0a2700,
379 .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
382 .firmware_revision = 0x0a2700,
384 .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
387 .firmware_revision = 0x0a2700,
389 .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
392 .firmware_revision = 0x0a2700,
394 .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
398 static void free_orb(struct kref *kref)
400 struct sbp2_orb *orb = container_of(kref, struct sbp2_orb, kref);
405 static void sbp2_status_write(struct fw_card *card, struct fw_request *request,
406 int tcode, int destination, int source,
407 int generation, unsigned long long offset,
408 void *payload, size_t length, void *callback_data)
410 struct sbp2_logical_unit *lu = callback_data;
411 struct sbp2_orb *orb;
412 struct sbp2_status status;
415 if (tcode != TCODE_WRITE_BLOCK_REQUEST ||
416 length < 8 || length > sizeof(status)) {
417 fw_send_response(card, request, RCODE_TYPE_ERROR);
421 status.status = be32_to_cpup(payload);
422 status.orb_low = be32_to_cpup(payload + 4);
423 memset(status.data, 0, sizeof(status.data));
425 memcpy(status.data, payload + 8, length - 8);
427 if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) {
428 fw_notify("non-orb related status write, not handled\n");
429 fw_send_response(card, request, RCODE_COMPLETE);
433 /* Lookup the orb corresponding to this status write. */
434 spin_lock_irqsave(&card->lock, flags);
435 list_for_each_entry(orb, &lu->orb_list, link) {
436 if (STATUS_GET_ORB_HIGH(status) == 0 &&
437 STATUS_GET_ORB_LOW(status) == orb->request_bus) {
438 orb->rcode = RCODE_COMPLETE;
439 list_del(&orb->link);
443 spin_unlock_irqrestore(&card->lock, flags);
445 if (&orb->link != &lu->orb_list) {
446 orb->callback(orb, &status);
447 kref_put(&orb->kref, free_orb); /* orb callback reference */
449 fw_error("status write for unknown orb\n");
452 fw_send_response(card, request, RCODE_COMPLETE);
455 static void complete_transaction(struct fw_card *card, int rcode,
456 void *payload, size_t length, void *data)
458 struct sbp2_orb *orb = data;
462 * This is a little tricky. We can get the status write for
463 * the orb before we get this callback. The status write
464 * handler above will assume the orb pointer transaction was
465 * successful and set the rcode to RCODE_COMPLETE for the orb.
466 * So this callback only sets the rcode if it hasn't already
467 * been set and only does the cleanup if the transaction
468 * failed and we didn't already get a status write.
470 spin_lock_irqsave(&card->lock, flags);
472 if (orb->rcode == -1)
474 if (orb->rcode != RCODE_COMPLETE) {
475 list_del(&orb->link);
476 spin_unlock_irqrestore(&card->lock, flags);
478 orb->callback(orb, NULL);
479 kref_put(&orb->kref, free_orb); /* orb callback reference */
481 spin_unlock_irqrestore(&card->lock, flags);
484 kref_put(&orb->kref, free_orb); /* transaction callback reference */
487 static void sbp2_send_orb(struct sbp2_orb *orb, struct sbp2_logical_unit *lu,
488 int node_id, int generation, u64 offset)
490 struct fw_device *device = target_device(lu->tgt);
491 struct sbp2_pointer orb_pointer;
494 orb_pointer.high = 0;
495 orb_pointer.low = cpu_to_be32(orb->request_bus);
497 spin_lock_irqsave(&device->card->lock, flags);
498 list_add_tail(&orb->link, &lu->orb_list);
499 spin_unlock_irqrestore(&device->card->lock, flags);
501 kref_get(&orb->kref); /* transaction callback reference */
502 kref_get(&orb->kref); /* orb callback reference */
504 fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST,
505 node_id, generation, device->max_speed, offset,
506 &orb_pointer, 8, complete_transaction, orb);
509 static int sbp2_cancel_orbs(struct sbp2_logical_unit *lu)
511 struct fw_device *device = target_device(lu->tgt);
512 struct sbp2_orb *orb, *next;
513 struct list_head list;
515 int retval = -ENOENT;
517 INIT_LIST_HEAD(&list);
518 spin_lock_irqsave(&device->card->lock, flags);
519 list_splice_init(&lu->orb_list, &list);
520 spin_unlock_irqrestore(&device->card->lock, flags);
522 list_for_each_entry_safe(orb, next, &list, link) {
524 if (fw_cancel_transaction(device->card, &orb->t) == 0)
527 orb->rcode = RCODE_CANCELLED;
528 orb->callback(orb, NULL);
529 kref_put(&orb->kref, free_orb); /* orb callback reference */
535 static void complete_management_orb(struct sbp2_orb *base_orb,
536 struct sbp2_status *status)
538 struct sbp2_management_orb *orb =
539 container_of(base_orb, struct sbp2_management_orb, base);
542 memcpy(&orb->status, status, sizeof(*status));
543 complete(&orb->done);
546 static int sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id,
547 int generation, int function,
548 int lun_or_login_id, void *response)
550 struct fw_device *device = target_device(lu->tgt);
551 struct sbp2_management_orb *orb;
552 unsigned int timeout;
553 int retval = -ENOMEM;
555 if (function == SBP2_LOGOUT_REQUEST && fw_device_is_shutdown(device))
558 orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
562 kref_init(&orb->base.kref);
564 dma_map_single(device->card->device, &orb->response,
565 sizeof(orb->response), DMA_FROM_DEVICE);
566 if (dma_mapping_error(device->card->device, orb->response_bus))
567 goto fail_mapping_response;
569 orb->request.response.high = 0;
570 orb->request.response.low = cpu_to_be32(orb->response_bus);
572 orb->request.misc = cpu_to_be32(
573 MANAGEMENT_ORB_NOTIFY |
574 MANAGEMENT_ORB_FUNCTION(function) |
575 MANAGEMENT_ORB_LUN(lun_or_login_id));
576 orb->request.length = cpu_to_be32(
577 MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response)));
579 orb->request.status_fifo.high =
580 cpu_to_be32(lu->address_handler.offset >> 32);
581 orb->request.status_fifo.low =
582 cpu_to_be32(lu->address_handler.offset);
584 if (function == SBP2_LOGIN_REQUEST) {
585 /* Ask for 2^2 == 4 seconds reconnect grace period */
586 orb->request.misc |= cpu_to_be32(
587 MANAGEMENT_ORB_RECONNECT(2) |
588 MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login));
589 timeout = lu->tgt->mgt_orb_timeout;
591 timeout = SBP2_ORB_TIMEOUT;
594 init_completion(&orb->done);
595 orb->base.callback = complete_management_orb;
597 orb->base.request_bus =
598 dma_map_single(device->card->device, &orb->request,
599 sizeof(orb->request), DMA_TO_DEVICE);
600 if (dma_mapping_error(device->card->device, orb->base.request_bus))
601 goto fail_mapping_request;
603 sbp2_send_orb(&orb->base, lu, node_id, generation,
604 lu->tgt->management_agent_address);
606 wait_for_completion_timeout(&orb->done, msecs_to_jiffies(timeout));
609 if (sbp2_cancel_orbs(lu) == 0) {
610 fw_error("%s: orb reply timed out, rcode=0x%02x\n",
611 lu->tgt->bus_id, orb->base.rcode);
615 if (orb->base.rcode != RCODE_COMPLETE) {
616 fw_error("%s: management write failed, rcode 0x%02x\n",
617 lu->tgt->bus_id, orb->base.rcode);
621 if (STATUS_GET_RESPONSE(orb->status) != 0 ||
622 STATUS_GET_SBP_STATUS(orb->status) != 0) {
623 fw_error("%s: error status: %d:%d\n", lu->tgt->bus_id,
624 STATUS_GET_RESPONSE(orb->status),
625 STATUS_GET_SBP_STATUS(orb->status));
631 dma_unmap_single(device->card->device, orb->base.request_bus,
632 sizeof(orb->request), DMA_TO_DEVICE);
633 fail_mapping_request:
634 dma_unmap_single(device->card->device, orb->response_bus,
635 sizeof(orb->response), DMA_FROM_DEVICE);
636 fail_mapping_response:
638 memcpy(response, orb->response, sizeof(orb->response));
639 kref_put(&orb->base.kref, free_orb);
644 static void sbp2_agent_reset(struct sbp2_logical_unit *lu)
646 struct fw_device *device = target_device(lu->tgt);
649 fw_run_transaction(device->card, TCODE_WRITE_QUADLET_REQUEST,
650 lu->tgt->node_id, lu->generation, device->max_speed,
651 lu->command_block_agent_address + SBP2_AGENT_RESET,
655 static void complete_agent_reset_write_no_wait(struct fw_card *card,
656 int rcode, void *payload, size_t length, void *data)
661 static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu)
663 struct fw_device *device = target_device(lu->tgt);
664 struct fw_transaction *t;
667 t = kmalloc(sizeof(*t), GFP_ATOMIC);
671 fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
672 lu->tgt->node_id, lu->generation, device->max_speed,
673 lu->command_block_agent_address + SBP2_AGENT_RESET,
674 &d, 4, complete_agent_reset_write_no_wait, t);
677 static inline void sbp2_allow_block(struct sbp2_logical_unit *lu)
680 * We may access dont_block without taking card->lock here:
681 * All callers of sbp2_allow_block() and all callers of sbp2_unblock()
682 * are currently serialized against each other.
683 * And a wrong result in sbp2_conditionally_block()'s access of
684 * dont_block is rather harmless, it simply misses its first chance.
686 --lu->tgt->dont_block;
690 * Blocks lu->tgt if all of the following conditions are met:
691 * - Login, INQUIRY, and high-level SCSI setup of all of the target's
692 * logical units have been finished (indicated by dont_block == 0).
693 * - lu->generation is stale.
695 * Note, scsi_block_requests() must be called while holding card->lock,
696 * otherwise it might foil sbp2_[conditionally_]unblock()'s attempt to
697 * unblock the target.
699 static void sbp2_conditionally_block(struct sbp2_logical_unit *lu)
701 struct sbp2_target *tgt = lu->tgt;
702 struct fw_card *card = target_device(tgt)->card;
703 struct Scsi_Host *shost =
704 container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
707 spin_lock_irqsave(&card->lock, flags);
708 if (!tgt->dont_block && !lu->blocked &&
709 lu->generation != card->generation) {
711 if (++tgt->blocked == 1)
712 scsi_block_requests(shost);
714 spin_unlock_irqrestore(&card->lock, flags);
718 * Unblocks lu->tgt as soon as all its logical units can be unblocked.
719 * Note, it is harmless to run scsi_unblock_requests() outside the
720 * card->lock protected section. On the other hand, running it inside
721 * the section might clash with shost->host_lock.
723 static void sbp2_conditionally_unblock(struct sbp2_logical_unit *lu)
725 struct sbp2_target *tgt = lu->tgt;
726 struct fw_card *card = target_device(tgt)->card;
727 struct Scsi_Host *shost =
728 container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
730 bool unblock = false;
732 spin_lock_irqsave(&card->lock, flags);
733 if (lu->blocked && lu->generation == card->generation) {
735 unblock = --tgt->blocked == 0;
737 spin_unlock_irqrestore(&card->lock, flags);
740 scsi_unblock_requests(shost);
744 * Prevents future blocking of tgt and unblocks it.
745 * Note, it is harmless to run scsi_unblock_requests() outside the
746 * card->lock protected section. On the other hand, running it inside
747 * the section might clash with shost->host_lock.
749 static void sbp2_unblock(struct sbp2_target *tgt)
751 struct fw_card *card = target_device(tgt)->card;
752 struct Scsi_Host *shost =
753 container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
756 spin_lock_irqsave(&card->lock, flags);
758 spin_unlock_irqrestore(&card->lock, flags);
760 scsi_unblock_requests(shost);
763 static int sbp2_lun2int(u16 lun)
765 struct scsi_lun eight_bytes_lun;
767 memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun));
768 eight_bytes_lun.scsi_lun[0] = (lun >> 8) & 0xff;
769 eight_bytes_lun.scsi_lun[1] = lun & 0xff;
771 return scsilun_to_int(&eight_bytes_lun);
774 static void sbp2_release_target(struct sbp2_target *tgt)
776 struct sbp2_logical_unit *lu, *next;
777 struct Scsi_Host *shost =
778 container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
779 struct scsi_device *sdev;
780 struct fw_device *device = target_device(tgt);
782 /* prevent deadlocks */
785 list_for_each_entry_safe(lu, next, &tgt->lu_list, link) {
786 sdev = scsi_device_lookup(shost, 0, 0, sbp2_lun2int(lu->lun));
788 scsi_remove_device(sdev);
789 scsi_device_put(sdev);
791 if (lu->login_id != INVALID_LOGIN_ID) {
792 int generation, node_id;
794 * tgt->node_id may be obsolete here if we failed
795 * during initial login or after a bus reset where
796 * the topology changed.
798 generation = device->generation;
799 smp_rmb(); /* node_id vs. generation */
800 node_id = device->node_id;
801 sbp2_send_management_orb(lu, node_id, generation,
805 fw_core_remove_address_handler(&lu->address_handler);
809 scsi_remove_host(shost);
810 fw_notify("released %s, target %d:0:0\n", tgt->bus_id, shost->host_no);
812 scsi_host_put(shost);
815 static void sbp2_queue_work(struct sbp2_logical_unit *lu, unsigned long delay)
817 queue_delayed_work(fw_workqueue, &lu->work, delay);
821 * Write retransmit retry values into the BUSY_TIMEOUT register.
822 * - The single-phase retry protocol is supported by all SBP-2 devices, but the
823 * default retry_limit value is 0 (i.e. never retry transmission). We write a
824 * saner value after logging into the device.
825 * - The dual-phase retry protocol is optional to implement, and if not
826 * supported, writes to the dual-phase portion of the register will be
827 * ignored. We try to write the original 1394-1995 default here.
828 * - In the case of devices that are also SBP-3-compliant, all writes are
829 * ignored, as the register is read-only, but contains single-phase retry of
830 * 15, which is what we're trying to set for all SBP-2 device anyway, so this
831 * write attempt is safe and yields more consistent behavior for all devices.
833 * See section 8.3.2.3.5 of the 1394-1995 spec, section 6.2 of the SBP-2 spec,
834 * and section 6.4 of the SBP-3 spec for further details.
836 static void sbp2_set_busy_timeout(struct sbp2_logical_unit *lu)
838 struct fw_device *device = target_device(lu->tgt);
839 __be32 d = cpu_to_be32(SBP2_CYCLE_LIMIT | SBP2_RETRY_LIMIT);
841 fw_run_transaction(device->card, TCODE_WRITE_QUADLET_REQUEST,
842 lu->tgt->node_id, lu->generation, device->max_speed,
843 CSR_REGISTER_BASE + CSR_BUSY_TIMEOUT, &d, 4);
846 static void sbp2_reconnect(struct work_struct *work);
848 static void sbp2_login(struct work_struct *work)
850 struct sbp2_logical_unit *lu =
851 container_of(work, struct sbp2_logical_unit, work.work);
852 struct sbp2_target *tgt = lu->tgt;
853 struct fw_device *device = target_device(tgt);
854 struct Scsi_Host *shost;
855 struct scsi_device *sdev;
856 struct sbp2_login_response response;
857 int generation, node_id, local_node_id;
859 if (fw_device_is_shutdown(device))
862 generation = device->generation;
863 smp_rmb(); /* node IDs must not be older than generation */
864 node_id = device->node_id;
865 local_node_id = device->card->node_id;
867 /* If this is a re-login attempt, log out, or we might be rejected. */
869 sbp2_send_management_orb(lu, device->node_id, generation,
870 SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
872 if (sbp2_send_management_orb(lu, node_id, generation,
873 SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) {
874 if (lu->retries++ < 5) {
875 sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
877 fw_error("%s: failed to login to LUN %04x\n",
878 tgt->bus_id, lu->lun);
879 /* Let any waiting I/O fail from now on. */
880 sbp2_unblock(lu->tgt);
885 tgt->node_id = node_id;
886 tgt->address_high = local_node_id << 16;
887 smp_wmb(); /* node IDs must not be older than generation */
888 lu->generation = generation;
890 lu->command_block_agent_address =
891 ((u64)(be32_to_cpu(response.command_block_agent.high) & 0xffff)
892 << 32) | be32_to_cpu(response.command_block_agent.low);
893 lu->login_id = be32_to_cpu(response.misc) & 0xffff;
895 fw_notify("%s: logged in to LUN %04x (%d retries)\n",
896 tgt->bus_id, lu->lun, lu->retries);
898 /* set appropriate retry limit(s) in BUSY_TIMEOUT register */
899 sbp2_set_busy_timeout(lu);
901 PREPARE_DELAYED_WORK(&lu->work, sbp2_reconnect);
902 sbp2_agent_reset(lu);
904 /* This was a re-login. */
906 sbp2_cancel_orbs(lu);
907 sbp2_conditionally_unblock(lu);
912 if (lu->tgt->workarounds & SBP2_WORKAROUND_DELAY_INQUIRY)
913 ssleep(SBP2_INQUIRY_DELAY);
915 shost = container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
916 sdev = __scsi_add_device(shost, 0, 0, sbp2_lun2int(lu->lun), lu);
918 * FIXME: We are unable to perform reconnects while in sbp2_login().
919 * Therefore __scsi_add_device() will get into trouble if a bus reset
920 * happens in parallel. It will either fail or leave us with an
921 * unusable sdev. As a workaround we check for this and retry the
922 * whole login and SCSI probing.
925 /* Reported error during __scsi_add_device() */
927 goto out_logout_login;
929 /* Unreported error during __scsi_add_device() */
930 smp_rmb(); /* get current card generation */
931 if (generation != device->card->generation) {
932 scsi_remove_device(sdev);
933 scsi_device_put(sdev);
934 goto out_logout_login;
937 /* No error during __scsi_add_device() */
939 scsi_device_put(sdev);
940 sbp2_allow_block(lu);
945 smp_rmb(); /* generation may have changed */
946 generation = device->generation;
947 smp_rmb(); /* node_id must not be older than generation */
949 sbp2_send_management_orb(lu, device->node_id, generation,
950 SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
952 * If a bus reset happened, sbp2_update will have requeued
953 * lu->work already. Reset the work from reconnect to login.
955 PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
958 static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry)
960 struct sbp2_logical_unit *lu;
962 lu = kmalloc(sizeof(*lu), GFP_KERNEL);
966 lu->address_handler.length = 0x100;
967 lu->address_handler.address_callback = sbp2_status_write;
968 lu->address_handler.callback_data = lu;
970 if (fw_core_add_address_handler(&lu->address_handler,
971 &fw_high_memory_region) < 0) {
977 lu->lun = lun_entry & 0xffff;
978 lu->login_id = INVALID_LOGIN_ID;
980 lu->has_sdev = false;
983 INIT_LIST_HEAD(&lu->orb_list);
984 INIT_DELAYED_WORK(&lu->work, sbp2_login);
986 list_add_tail(&lu->link, &tgt->lu_list);
990 static int sbp2_scan_logical_unit_dir(struct sbp2_target *tgt,
991 const u32 *directory)
993 struct fw_csr_iterator ci;
996 fw_csr_iterator_init(&ci, directory);
997 while (fw_csr_iterator_next(&ci, &key, &value))
998 if (key == SBP2_CSR_LOGICAL_UNIT_NUMBER &&
999 sbp2_add_logical_unit(tgt, value) < 0)
1004 static int sbp2_scan_unit_dir(struct sbp2_target *tgt, const u32 *directory,
1005 u32 *model, u32 *firmware_revision)
1007 struct fw_csr_iterator ci;
1010 fw_csr_iterator_init(&ci, directory);
1011 while (fw_csr_iterator_next(&ci, &key, &value)) {
1014 case CSR_DEPENDENT_INFO | CSR_OFFSET:
1015 tgt->management_agent_address =
1016 CSR_REGISTER_BASE + 4 * value;
1019 case CSR_DIRECTORY_ID:
1020 tgt->directory_id = value;
1027 case SBP2_CSR_FIRMWARE_REVISION:
1028 *firmware_revision = value;
1031 case SBP2_CSR_UNIT_CHARACTERISTICS:
1032 /* the timeout value is stored in 500ms units */
1033 tgt->mgt_orb_timeout = (value >> 8 & 0xff) * 500;
1036 case SBP2_CSR_LOGICAL_UNIT_NUMBER:
1037 if (sbp2_add_logical_unit(tgt, value) < 0)
1041 case SBP2_CSR_LOGICAL_UNIT_DIRECTORY:
1042 /* Adjust for the increment in the iterator */
1043 if (sbp2_scan_logical_unit_dir(tgt, ci.p - 1 + value) < 0)
1052 * Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be
1053 * provided in the config rom. Most devices do provide a value, which
1054 * we'll use for login management orbs, but with some sane limits.
1056 static void sbp2_clamp_management_orb_timeout(struct sbp2_target *tgt)
1058 unsigned int timeout = tgt->mgt_orb_timeout;
1060 if (timeout > 40000)
1061 fw_notify("%s: %ds mgt_ORB_timeout limited to 40s\n",
1062 tgt->bus_id, timeout / 1000);
1064 tgt->mgt_orb_timeout = clamp_val(timeout, 5000, 40000);
1067 static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model,
1068 u32 firmware_revision)
1071 unsigned int w = sbp2_param_workarounds;
1074 fw_notify("Please notify linux1394-devel@lists.sourceforge.net "
1075 "if you need the workarounds parameter for %s\n",
1078 if (w & SBP2_WORKAROUND_OVERRIDE)
1081 for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
1083 if (sbp2_workarounds_table[i].firmware_revision !=
1084 (firmware_revision & 0xffffff00))
1087 if (sbp2_workarounds_table[i].model != model &&
1088 sbp2_workarounds_table[i].model != SBP2_ROM_VALUE_WILDCARD)
1091 w |= sbp2_workarounds_table[i].workarounds;
1096 fw_notify("Workarounds for %s: 0x%x "
1097 "(firmware_revision 0x%06x, model_id 0x%06x)\n",
1098 tgt->bus_id, w, firmware_revision, model);
1099 tgt->workarounds = w;
1102 static struct scsi_host_template scsi_driver_template;
1104 static int sbp2_probe(struct device *dev)
1106 struct fw_unit *unit = fw_unit(dev);
1107 struct fw_device *device = fw_parent_device(unit);
1108 struct sbp2_target *tgt;
1109 struct sbp2_logical_unit *lu;
1110 struct Scsi_Host *shost;
1111 u32 model, firmware_revision;
1113 if (dma_get_max_seg_size(device->card->device) > SBP2_MAX_SEG_SIZE)
1114 BUG_ON(dma_set_max_seg_size(device->card->device,
1115 SBP2_MAX_SEG_SIZE));
1117 shost = scsi_host_alloc(&scsi_driver_template, sizeof(*tgt));
1121 tgt = (struct sbp2_target *)shost->hostdata;
1122 dev_set_drvdata(&unit->device, tgt);
1124 INIT_LIST_HEAD(&tgt->lu_list);
1125 tgt->bus_id = dev_name(&unit->device);
1126 tgt->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
1128 if (fw_device_enable_phys_dma(device) < 0)
1129 goto fail_shost_put;
1131 shost->max_cmd_len = SBP2_MAX_CDB_SIZE;
1133 if (scsi_add_host(shost, &unit->device) < 0)
1134 goto fail_shost_put;
1136 /* implicit directory ID */
1137 tgt->directory_id = ((unit->directory - device->config_rom) * 4
1138 + CSR_CONFIG_ROM) & 0xffffff;
1140 firmware_revision = SBP2_ROM_VALUE_MISSING;
1141 model = SBP2_ROM_VALUE_MISSING;
1143 if (sbp2_scan_unit_dir(tgt, unit->directory, &model,
1144 &firmware_revision) < 0)
1145 goto fail_release_target;
1147 sbp2_clamp_management_orb_timeout(tgt);
1148 sbp2_init_workarounds(tgt, model, firmware_revision);
1151 * At S100 we can do 512 bytes per packet, at S200 1024 bytes,
1152 * and so on up to 4096 bytes. The SBP-2 max_payload field
1153 * specifies the max payload size as 2 ^ (max_payload + 2), so
1154 * if we set this to max_speed + 7, we get the right value.
1156 tgt->max_payload = min(device->max_speed + 7, 10U);
1157 tgt->max_payload = min(tgt->max_payload, device->card->max_receive - 1);
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 fail_release_target:
1166 sbp2_release_target(tgt);
1170 scsi_host_put(shost);
1174 static int sbp2_remove(struct device *dev)
1176 struct fw_unit *unit = fw_unit(dev);
1177 struct sbp2_target *tgt = dev_get_drvdata(&unit->device);
1178 struct sbp2_logical_unit *lu;
1180 list_for_each_entry(lu, &tgt->lu_list, link)
1181 cancel_delayed_work_sync(&lu->work);
1183 sbp2_release_target(tgt);
1188 static void sbp2_reconnect(struct work_struct *work)
1190 struct sbp2_logical_unit *lu =
1191 container_of(work, struct sbp2_logical_unit, work.work);
1192 struct sbp2_target *tgt = lu->tgt;
1193 struct fw_device *device = target_device(tgt);
1194 int generation, node_id, local_node_id;
1196 if (fw_device_is_shutdown(device))
1199 generation = device->generation;
1200 smp_rmb(); /* node IDs must not be older than generation */
1201 node_id = device->node_id;
1202 local_node_id = device->card->node_id;
1204 if (sbp2_send_management_orb(lu, node_id, generation,
1205 SBP2_RECONNECT_REQUEST,
1206 lu->login_id, NULL) < 0) {
1208 * If reconnect was impossible even though we are in the
1209 * current generation, fall back and try to log in again.
1211 * We could check for "Function rejected" status, but
1212 * looking at the bus generation as simpler and more general.
1214 smp_rmb(); /* get current card generation */
1215 if (generation == device->card->generation ||
1216 lu->retries++ >= 5) {
1217 fw_error("%s: failed to reconnect\n", tgt->bus_id);
1219 PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
1221 sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
1226 tgt->node_id = node_id;
1227 tgt->address_high = local_node_id << 16;
1228 smp_wmb(); /* node IDs must not be older than generation */
1229 lu->generation = generation;
1231 fw_notify("%s: reconnected to LUN %04x (%d retries)\n",
1232 tgt->bus_id, lu->lun, lu->retries);
1234 sbp2_agent_reset(lu);
1235 sbp2_cancel_orbs(lu);
1236 sbp2_conditionally_unblock(lu);
1239 static void sbp2_update(struct fw_unit *unit)
1241 struct sbp2_target *tgt = dev_get_drvdata(&unit->device);
1242 struct sbp2_logical_unit *lu;
1244 fw_device_enable_phys_dma(fw_parent_device(unit));
1247 * Fw-core serializes sbp2_update() against sbp2_remove().
1248 * Iteration over tgt->lu_list is therefore safe here.
1250 list_for_each_entry(lu, &tgt->lu_list, link) {
1251 sbp2_conditionally_block(lu);
1253 sbp2_queue_work(lu, 0);
1257 #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
1258 #define SBP2_SW_VERSION_ENTRY 0x00010483
1260 static const struct ieee1394_device_id sbp2_id_table[] = {
1262 .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
1263 IEEE1394_MATCH_VERSION,
1264 .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY,
1265 .version = SBP2_SW_VERSION_ENTRY,
1270 static struct fw_driver sbp2_driver = {
1272 .owner = THIS_MODULE,
1273 .name = sbp2_driver_name,
1274 .bus = &fw_bus_type,
1275 .probe = sbp2_probe,
1276 .remove = sbp2_remove,
1278 .update = sbp2_update,
1279 .id_table = sbp2_id_table,
1282 static void sbp2_unmap_scatterlist(struct device *card_device,
1283 struct sbp2_command_orb *orb)
1285 if (scsi_sg_count(orb->cmd))
1286 dma_unmap_sg(card_device, scsi_sglist(orb->cmd),
1287 scsi_sg_count(orb->cmd),
1288 orb->cmd->sc_data_direction);
1290 if (orb->request.misc & cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT))
1291 dma_unmap_single(card_device, orb->page_table_bus,
1292 sizeof(orb->page_table), DMA_TO_DEVICE);
1295 static unsigned int sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data)
1299 sense_data[0] = 0x70;
1300 sense_data[1] = 0x0;
1301 sense_data[2] = sbp2_status[1];
1302 sense_data[3] = sbp2_status[4];
1303 sense_data[4] = sbp2_status[5];
1304 sense_data[5] = sbp2_status[6];
1305 sense_data[6] = sbp2_status[7];
1307 sense_data[8] = sbp2_status[8];
1308 sense_data[9] = sbp2_status[9];
1309 sense_data[10] = sbp2_status[10];
1310 sense_data[11] = sbp2_status[11];
1311 sense_data[12] = sbp2_status[2];
1312 sense_data[13] = sbp2_status[3];
1313 sense_data[14] = sbp2_status[12];
1314 sense_data[15] = sbp2_status[13];
1316 sam_status = sbp2_status[0] & 0x3f;
1318 switch (sam_status) {
1320 case SAM_STAT_CHECK_CONDITION:
1321 case SAM_STAT_CONDITION_MET:
1323 case SAM_STAT_RESERVATION_CONFLICT:
1324 case SAM_STAT_COMMAND_TERMINATED:
1325 return DID_OK << 16 | sam_status;
1328 return DID_ERROR << 16;
1332 static void complete_command_orb(struct sbp2_orb *base_orb,
1333 struct sbp2_status *status)
1335 struct sbp2_command_orb *orb =
1336 container_of(base_orb, struct sbp2_command_orb, base);
1337 struct fw_device *device = target_device(orb->lu->tgt);
1340 if (status != NULL) {
1341 if (STATUS_GET_DEAD(*status))
1342 sbp2_agent_reset_no_wait(orb->lu);
1344 switch (STATUS_GET_RESPONSE(*status)) {
1345 case SBP2_STATUS_REQUEST_COMPLETE:
1346 result = DID_OK << 16;
1348 case SBP2_STATUS_TRANSPORT_FAILURE:
1349 result = DID_BUS_BUSY << 16;
1351 case SBP2_STATUS_ILLEGAL_REQUEST:
1352 case SBP2_STATUS_VENDOR_DEPENDENT:
1354 result = DID_ERROR << 16;
1358 if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1)
1359 result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status),
1360 orb->cmd->sense_buffer);
1363 * If the orb completes with status == NULL, something
1364 * went wrong, typically a bus reset happened mid-orb
1365 * or when sending the write (less likely).
1367 result = DID_BUS_BUSY << 16;
1368 sbp2_conditionally_block(orb->lu);
1371 dma_unmap_single(device->card->device, orb->base.request_bus,
1372 sizeof(orb->request), DMA_TO_DEVICE);
1373 sbp2_unmap_scatterlist(device->card->device, orb);
1375 orb->cmd->result = result;
1376 orb->cmd->scsi_done(orb->cmd);
1379 static int sbp2_map_scatterlist(struct sbp2_command_orb *orb,
1380 struct fw_device *device, struct sbp2_logical_unit *lu)
1382 struct scatterlist *sg = scsi_sglist(orb->cmd);
1385 n = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
1386 orb->cmd->sc_data_direction);
1391 * Handle the special case where there is only one element in
1392 * the scatter list by converting it to an immediate block
1393 * request. This is also a workaround for broken devices such
1394 * as the second generation iPod which doesn't support page
1398 orb->request.data_descriptor.high =
1399 cpu_to_be32(lu->tgt->address_high);
1400 orb->request.data_descriptor.low =
1401 cpu_to_be32(sg_dma_address(sg));
1402 orb->request.misc |=
1403 cpu_to_be32(COMMAND_ORB_DATA_SIZE(sg_dma_len(sg)));
1407 for_each_sg(sg, sg, n, i) {
1408 orb->page_table[i].high = cpu_to_be32(sg_dma_len(sg) << 16);
1409 orb->page_table[i].low = cpu_to_be32(sg_dma_address(sg));
1412 orb->page_table_bus =
1413 dma_map_single(device->card->device, orb->page_table,
1414 sizeof(orb->page_table), DMA_TO_DEVICE);
1415 if (dma_mapping_error(device->card->device, orb->page_table_bus))
1416 goto fail_page_table;
1419 * The data_descriptor pointer is the one case where we need
1420 * to fill in the node ID part of the address. All other
1421 * pointers assume that the data referenced reside on the
1422 * initiator (i.e. us), but data_descriptor can refer to data
1423 * on other nodes so we need to put our ID in descriptor.high.
1425 orb->request.data_descriptor.high = cpu_to_be32(lu->tgt->address_high);
1426 orb->request.data_descriptor.low = cpu_to_be32(orb->page_table_bus);
1427 orb->request.misc |= cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT |
1428 COMMAND_ORB_DATA_SIZE(n));
1433 dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd),
1434 scsi_sg_count(orb->cmd), orb->cmd->sc_data_direction);
1439 /* SCSI stack integration */
1441 static int sbp2_scsi_queuecommand(struct Scsi_Host *shost,
1442 struct scsi_cmnd *cmd)
1444 struct sbp2_logical_unit *lu = cmd->device->hostdata;
1445 struct fw_device *device = target_device(lu->tgt);
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;
1456 cmd->scsi_done(cmd);
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);
1471 orb->request.next.high = cpu_to_be32(SBP2_ORB_NULL);
1472 orb->request.misc = cpu_to_be32(
1473 COMMAND_ORB_MAX_PAYLOAD(lu->tgt->max_payload) |
1474 COMMAND_ORB_SPEED(device->max_speed) |
1475 COMMAND_ORB_NOTIFY);
1477 if (cmd->sc_data_direction == DMA_FROM_DEVICE)
1478 orb->request.misc |= cpu_to_be32(COMMAND_ORB_DIRECTION);
1480 generation = device->generation;
1481 smp_rmb(); /* sbp2_map_scatterlist looks at tgt->address_high */
1483 if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0)
1486 memcpy(orb->request.command_block, cmd->cmnd, cmd->cmd_len);
1488 orb->base.callback = complete_command_orb;
1489 orb->base.request_bus =
1490 dma_map_single(device->card->device, &orb->request,
1491 sizeof(orb->request), DMA_TO_DEVICE);
1492 if (dma_mapping_error(device->card->device, orb->base.request_bus)) {
1493 sbp2_unmap_scatterlist(device->card->device, orb);
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_hw_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.
1576 static ssize_t sbp2_sysfs_ieee1394_id_show(struct device *dev,
1577 struct device_attribute *attr, char *buf)
1579 struct scsi_device *sdev = to_scsi_device(dev);
1580 struct sbp2_logical_unit *lu;
1585 lu = sdev->hostdata;
1587 return sprintf(buf, "%016llx:%06x:%04x\n",
1588 (unsigned long long)lu->tgt->guid,
1589 lu->tgt->directory_id, lu->lun);
1592 static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL);
1594 static struct device_attribute *sbp2_scsi_sysfs_attrs[] = {
1595 &dev_attr_ieee1394_id,
1599 static struct scsi_host_template scsi_driver_template = {
1600 .module = THIS_MODULE,
1601 .name = "SBP-2 IEEE-1394",
1602 .proc_name = sbp2_driver_name,
1603 .queuecommand = sbp2_scsi_queuecommand,
1604 .slave_alloc = sbp2_scsi_slave_alloc,
1605 .slave_configure = sbp2_scsi_slave_configure,
1606 .eh_abort_handler = sbp2_scsi_abort,
1608 .sg_tablesize = SG_ALL,
1609 .use_clustering = ENABLE_CLUSTERING,
1612 .sdev_attrs = sbp2_scsi_sysfs_attrs,
1615 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
1616 MODULE_DESCRIPTION("SCSI over IEEE1394");
1617 MODULE_LICENSE("GPL");
1618 MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);
1620 /* Provide a module alias so root-on-sbp2 initrds don't break. */
1621 #ifndef CONFIG_IEEE1394_SBP2_MODULE
1622 MODULE_ALIAS("sbp2");
1625 static int __init sbp2_init(void)
1627 return driver_register(&sbp2_driver.driver);
1630 static void __exit sbp2_cleanup(void)
1632 driver_unregister(&sbp2_driver.driver);
1635 module_init(sbp2_init);
1636 module_exit(sbp2_cleanup);