2 * Device probing and sysfs code.
4 * Copyright (C) 2005-2006 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.
21 #include <linux/ctype.h>
22 #include <linux/delay.h>
23 #include <linux/device.h>
24 #include <linux/errno.h>
25 #include <linux/idr.h>
26 #include <linux/jiffies.h>
27 #include <linux/kobject.h>
28 #include <linux/list.h>
29 #include <linux/mutex.h>
30 #include <linux/rwsem.h>
31 #include <linux/semaphore.h>
32 #include <linux/spinlock.h>
33 #include <linux/string.h>
34 #include <linux/workqueue.h>
36 #include <asm/system.h>
38 #include "fw-device.h"
39 #include "fw-topology.h"
40 #include "fw-transaction.h"
42 void fw_csr_iterator_init(struct fw_csr_iterator
*ci
, u32
* p
)
45 ci
->end
= ci
->p
+ (p
[0] >> 16);
47 EXPORT_SYMBOL(fw_csr_iterator_init
);
49 int fw_csr_iterator_next(struct fw_csr_iterator
*ci
, int *key
, int *value
)
52 *value
= *ci
->p
& 0xffffff;
54 return ci
->p
++ < ci
->end
;
56 EXPORT_SYMBOL(fw_csr_iterator_next
);
58 static int is_fw_unit(struct device
*dev
);
60 static int match_unit_directory(u32
* directory
, const struct fw_device_id
*id
)
62 struct fw_csr_iterator ci
;
63 int key
, value
, match
;
66 fw_csr_iterator_init(&ci
, directory
);
67 while (fw_csr_iterator_next(&ci
, &key
, &value
)) {
68 if (key
== CSR_VENDOR
&& value
== id
->vendor
)
69 match
|= FW_MATCH_VENDOR
;
70 if (key
== CSR_MODEL
&& value
== id
->model
)
71 match
|= FW_MATCH_MODEL
;
72 if (key
== CSR_SPECIFIER_ID
&& value
== id
->specifier_id
)
73 match
|= FW_MATCH_SPECIFIER_ID
;
74 if (key
== CSR_VERSION
&& value
== id
->version
)
75 match
|= FW_MATCH_VERSION
;
78 return (match
& id
->match_flags
) == id
->match_flags
;
81 static int fw_unit_match(struct device
*dev
, struct device_driver
*drv
)
83 struct fw_unit
*unit
= fw_unit(dev
);
84 struct fw_driver
*driver
= fw_driver(drv
);
87 /* We only allow binding to fw_units. */
91 for (i
= 0; driver
->id_table
[i
].match_flags
!= 0; i
++) {
92 if (match_unit_directory(unit
->directory
, &driver
->id_table
[i
]))
99 static int get_modalias(struct fw_unit
*unit
, char *buffer
, size_t buffer_size
)
101 struct fw_device
*device
= fw_device(unit
->device
.parent
);
102 struct fw_csr_iterator ci
;
107 int specifier_id
= 0;
110 fw_csr_iterator_init(&ci
, &device
->config_rom
[5]);
111 while (fw_csr_iterator_next(&ci
, &key
, &value
)) {
122 fw_csr_iterator_init(&ci
, unit
->directory
);
123 while (fw_csr_iterator_next(&ci
, &key
, &value
)) {
125 case CSR_SPECIFIER_ID
:
126 specifier_id
= value
;
134 return snprintf(buffer
, buffer_size
,
135 "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
136 vendor
, model
, specifier_id
, version
);
139 static int fw_unit_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
141 struct fw_unit
*unit
= fw_unit(dev
);
144 get_modalias(unit
, modalias
, sizeof(modalias
));
146 if (add_uevent_var(env
, "MODALIAS=%s", modalias
))
152 struct bus_type fw_bus_type
= {
154 .match
= fw_unit_match
,
156 EXPORT_SYMBOL(fw_bus_type
);
158 int fw_device_enable_phys_dma(struct fw_device
*device
)
160 int generation
= device
->generation
;
162 /* device->node_id, accessed below, must not be older than generation */
165 return device
->card
->driver
->enable_phys_dma(device
->card
,
169 EXPORT_SYMBOL(fw_device_enable_phys_dma
);
171 struct config_rom_attribute
{
172 struct device_attribute attr
;
176 static ssize_t
show_immediate(struct device
*dev
,
177 struct device_attribute
*dattr
, char *buf
)
179 struct config_rom_attribute
*attr
=
180 container_of(dattr
, struct config_rom_attribute
, attr
);
181 struct fw_csr_iterator ci
;
183 int key
, value
, ret
= -ENOENT
;
185 down_read(&fw_device_rwsem
);
188 dir
= fw_unit(dev
)->directory
;
190 dir
= fw_device(dev
)->config_rom
+ 5;
192 fw_csr_iterator_init(&ci
, dir
);
193 while (fw_csr_iterator_next(&ci
, &key
, &value
))
194 if (attr
->key
== key
) {
195 ret
= snprintf(buf
, buf
? PAGE_SIZE
: 0,
200 up_read(&fw_device_rwsem
);
205 #define IMMEDIATE_ATTR(name, key) \
206 { __ATTR(name, S_IRUGO, show_immediate, NULL), key }
208 static ssize_t
show_text_leaf(struct device
*dev
,
209 struct device_attribute
*dattr
, char *buf
)
211 struct config_rom_attribute
*attr
=
212 container_of(dattr
, struct config_rom_attribute
, attr
);
213 struct fw_csr_iterator ci
;
214 u32
*dir
, *block
= NULL
, *p
, *end
;
215 int length
, key
, value
, last_key
= 0, ret
= -ENOENT
;
218 down_read(&fw_device_rwsem
);
221 dir
= fw_unit(dev
)->directory
;
223 dir
= fw_device(dev
)->config_rom
+ 5;
225 fw_csr_iterator_init(&ci
, dir
);
226 while (fw_csr_iterator_next(&ci
, &key
, &value
)) {
227 if (attr
->key
== last_key
&&
228 key
== (CSR_DESCRIPTOR
| CSR_LEAF
))
229 block
= ci
.p
- 1 + value
;
236 length
= min(block
[0] >> 16, 256U);
240 if (block
[1] != 0 || block
[2] != 0)
241 /* Unknown encoding. */
250 end
= &block
[length
+ 1];
251 for (p
= &block
[3]; p
< end
; p
++, b
+= 4)
252 * (u32
*) b
= (__force u32
) __cpu_to_be32(*p
);
254 /* Strip trailing whitespace and add newline. */
255 while (b
--, (isspace(*b
) || *b
== '\0') && b
> buf
);
259 up_read(&fw_device_rwsem
);
264 #define TEXT_LEAF_ATTR(name, key) \
265 { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key }
267 static struct config_rom_attribute config_rom_attributes
[] = {
268 IMMEDIATE_ATTR(vendor
, CSR_VENDOR
),
269 IMMEDIATE_ATTR(hardware_version
, CSR_HARDWARE_VERSION
),
270 IMMEDIATE_ATTR(specifier_id
, CSR_SPECIFIER_ID
),
271 IMMEDIATE_ATTR(version
, CSR_VERSION
),
272 IMMEDIATE_ATTR(model
, CSR_MODEL
),
273 TEXT_LEAF_ATTR(vendor_name
, CSR_VENDOR
),
274 TEXT_LEAF_ATTR(model_name
, CSR_MODEL
),
275 TEXT_LEAF_ATTR(hardware_version_name
, CSR_HARDWARE_VERSION
),
278 static void init_fw_attribute_group(struct device
*dev
,
279 struct device_attribute
*attrs
,
280 struct fw_attribute_group
*group
)
282 struct device_attribute
*attr
;
285 for (j
= 0; attrs
[j
].attr
.name
!= NULL
; j
++)
286 group
->attrs
[j
] = &attrs
[j
].attr
;
288 for (i
= 0; i
< ARRAY_SIZE(config_rom_attributes
); i
++) {
289 attr
= &config_rom_attributes
[i
].attr
;
290 if (attr
->show(dev
, attr
, NULL
) < 0)
292 group
->attrs
[j
++] = &attr
->attr
;
295 BUG_ON(j
>= ARRAY_SIZE(group
->attrs
));
296 group
->attrs
[j
++] = NULL
;
297 group
->groups
[0] = &group
->group
;
298 group
->groups
[1] = NULL
;
299 group
->group
.attrs
= group
->attrs
;
300 dev
->groups
= group
->groups
;
303 static ssize_t
modalias_show(struct device
*dev
,
304 struct device_attribute
*attr
, char *buf
)
306 struct fw_unit
*unit
= fw_unit(dev
);
309 length
= get_modalias(unit
, buf
, PAGE_SIZE
);
310 strcpy(buf
+ length
, "\n");
315 static ssize_t
rom_index_show(struct device
*dev
,
316 struct device_attribute
*attr
, char *buf
)
318 struct fw_device
*device
= fw_device(dev
->parent
);
319 struct fw_unit
*unit
= fw_unit(dev
);
321 return snprintf(buf
, PAGE_SIZE
, "%d\n",
322 (int)(unit
->directory
- device
->config_rom
));
325 static struct device_attribute fw_unit_attributes
[] = {
327 __ATTR_RO(rom_index
),
331 static ssize_t
config_rom_show(struct device
*dev
,
332 struct device_attribute
*attr
, char *buf
)
334 struct fw_device
*device
= fw_device(dev
);
337 down_read(&fw_device_rwsem
);
338 length
= device
->config_rom_length
* 4;
339 memcpy(buf
, device
->config_rom
, length
);
340 up_read(&fw_device_rwsem
);
345 static ssize_t
guid_show(struct device
*dev
,
346 struct device_attribute
*attr
, char *buf
)
348 struct fw_device
*device
= fw_device(dev
);
351 down_read(&fw_device_rwsem
);
352 ret
= snprintf(buf
, PAGE_SIZE
, "0x%08x%08x\n",
353 device
->config_rom
[3], device
->config_rom
[4]);
354 up_read(&fw_device_rwsem
);
359 static struct device_attribute fw_device_attributes
[] = {
360 __ATTR_RO(config_rom
),
365 static int read_rom(struct fw_device
*device
,
366 int generation
, int index
, u32
*data
)
370 /* device->node_id, accessed below, must not be older than generation */
373 rcode
= fw_run_transaction(device
->card
, TCODE_READ_QUADLET_REQUEST
,
374 device
->node_id
, generation
, device
->max_speed
,
375 (CSR_REGISTER_BASE
| CSR_CONFIG_ROM
) + index
* 4,
382 #define READ_BIB_ROM_SIZE 256
383 #define READ_BIB_STACK_SIZE 16
386 * Read the bus info block, perform a speed probe, and read all of the rest of
387 * the config ROM. We do all this with a cached bus generation. If the bus
388 * generation changes under us, read_bus_info_block will fail and get retried.
389 * It's better to start all over in this case because the node from which we
390 * are reading the ROM may have changed the ROM during the reset.
392 static int read_bus_info_block(struct fw_device
*device
, int generation
)
394 u32
*rom
, *stack
, *old_rom
, *new_rom
;
396 int i
, end
, length
, ret
= -1;
398 rom
= kmalloc(sizeof(*rom
) * READ_BIB_ROM_SIZE
+
399 sizeof(*stack
) * READ_BIB_STACK_SIZE
, GFP_KERNEL
);
403 stack
= &rom
[READ_BIB_ROM_SIZE
];
405 device
->max_speed
= SCODE_100
;
407 /* First read the bus info block. */
408 for (i
= 0; i
< 5; i
++) {
409 if (read_rom(device
, generation
, i
, &rom
[i
]) != RCODE_COMPLETE
)
412 * As per IEEE1212 7.2, during power-up, devices can
413 * reply with a 0 for the first quadlet of the config
414 * rom to indicate that they are booting (for example,
415 * if the firmware is on the disk of a external
416 * harddisk). In that case we just fail, and the
417 * retry mechanism will try again later.
419 if (i
== 0 && rom
[i
] == 0)
423 device
->max_speed
= device
->node
->max_speed
;
426 * Determine the speed of
427 * - devices with link speed less than PHY speed,
428 * - devices with 1394b PHY (unless only connected to 1394a PHYs),
429 * - all devices if there are 1394b repeaters.
430 * Note, we cannot use the bus info block's link_spd as starting point
431 * because some buggy firmwares set it lower than necessary and because
432 * 1394-1995 nodes do not have the field.
434 if ((rom
[2] & 0x7) < device
->max_speed
||
435 device
->max_speed
== SCODE_BETA
||
436 device
->card
->beta_repeaters_present
) {
439 /* for S1600 and S3200 */
440 if (device
->max_speed
== SCODE_BETA
)
441 device
->max_speed
= device
->card
->link_speed
;
443 while (device
->max_speed
> SCODE_100
) {
444 if (read_rom(device
, generation
, 0, &dummy
) ==
452 * Now parse the config rom. The config rom is a recursive
453 * directory structure so we parse it using a stack of
454 * references to the blocks that make up the structure. We
455 * push a reference to the root directory on the stack to
460 stack
[sp
++] = 0xc0000005;
463 * Pop the next block reference of the stack. The
464 * lower 24 bits is the offset into the config rom,
465 * the upper 8 bits are the type of the reference the
470 if (i
>= READ_BIB_ROM_SIZE
)
472 * The reference points outside the standard
473 * config rom area, something's fishy.
477 /* Read header quadlet for the block to get the length. */
478 if (read_rom(device
, generation
, i
, &rom
[i
]) != RCODE_COMPLETE
)
480 end
= i
+ (rom
[i
] >> 16) + 1;
482 if (end
> READ_BIB_ROM_SIZE
)
484 * This block extends outside standard config
485 * area (and the array we're reading it
486 * into). That's broken, so ignore this
492 * Now read in the block. If this is a directory
493 * block, check the entries as we read them to see if
494 * it references another block, and push it in that case.
497 if (read_rom(device
, generation
, i
, &rom
[i
]) !=
500 if ((key
>> 30) == 3 && (rom
[i
] >> 30) > 1 &&
501 sp
< READ_BIB_STACK_SIZE
)
502 stack
[sp
++] = i
+ rom
[i
];
509 old_rom
= device
->config_rom
;
510 new_rom
= kmemdup(rom
, length
* 4, GFP_KERNEL
);
514 down_write(&fw_device_rwsem
);
515 device
->config_rom
= new_rom
;
516 device
->config_rom_length
= length
;
517 up_write(&fw_device_rwsem
);
521 device
->cmc
= rom
[2] & 1 << 30;
528 static void fw_unit_release(struct device
*dev
)
530 struct fw_unit
*unit
= fw_unit(dev
);
535 static struct device_type fw_unit_type
= {
536 .uevent
= fw_unit_uevent
,
537 .release
= fw_unit_release
,
540 static int is_fw_unit(struct device
*dev
)
542 return dev
->type
== &fw_unit_type
;
545 static void create_units(struct fw_device
*device
)
547 struct fw_csr_iterator ci
;
548 struct fw_unit
*unit
;
552 fw_csr_iterator_init(&ci
, &device
->config_rom
[5]);
553 while (fw_csr_iterator_next(&ci
, &key
, &value
)) {
554 if (key
!= (CSR_UNIT
| CSR_DIRECTORY
))
558 * Get the address of the unit directory and try to
559 * match the drivers id_tables against it.
561 unit
= kzalloc(sizeof(*unit
), GFP_KERNEL
);
563 fw_error("failed to allocate memory for unit\n");
567 unit
->directory
= ci
.p
+ value
- 1;
568 unit
->device
.bus
= &fw_bus_type
;
569 unit
->device
.type
= &fw_unit_type
;
570 unit
->device
.parent
= &device
->device
;
571 dev_set_name(&unit
->device
, "%s.%d", dev_name(&device
->device
), i
++);
573 init_fw_attribute_group(&unit
->device
,
575 &unit
->attribute_group
);
576 if (device_register(&unit
->device
) < 0)
586 static int shutdown_unit(struct device
*device
, void *data
)
588 device_unregister(device
);
594 * fw_device_rwsem acts as dual purpose mutex:
595 * - serializes accesses to fw_device_idr,
596 * - serializes accesses to fw_device.config_rom/.config_rom_length and
597 * fw_unit.directory, unless those accesses happen at safe occasions
599 DECLARE_RWSEM(fw_device_rwsem
);
601 DEFINE_IDR(fw_device_idr
);
604 struct fw_device
*fw_device_get_by_devt(dev_t devt
)
606 struct fw_device
*device
;
608 down_read(&fw_device_rwsem
);
609 device
= idr_find(&fw_device_idr
, MINOR(devt
));
611 fw_device_get(device
);
612 up_read(&fw_device_rwsem
);
618 * These defines control the retry behavior for reading the config
619 * rom. It shouldn't be necessary to tweak these; if the device
620 * doesn't respond to a config rom read within 10 seconds, it's not
621 * going to respond at all. As for the initial delay, a lot of
622 * devices will be able to respond within half a second after bus
623 * reset. On the other hand, it's not really worth being more
624 * aggressive than that, since it scales pretty well; if 10 devices
625 * are plugged in, they're all getting read within one second.
628 #define MAX_RETRIES 10
629 #define RETRY_DELAY (3 * HZ)
630 #define INITIAL_DELAY (HZ / 2)
631 #define SHUTDOWN_DELAY (2 * HZ)
633 static void fw_device_shutdown(struct work_struct
*work
)
635 struct fw_device
*device
=
636 container_of(work
, struct fw_device
, work
.work
);
637 int minor
= MINOR(device
->device
.devt
);
639 if (time_is_after_jiffies(device
->card
->reset_jiffies
+ SHUTDOWN_DELAY
)
640 && !list_empty(&device
->card
->link
)) {
641 schedule_delayed_work(&device
->work
, SHUTDOWN_DELAY
);
645 if (atomic_cmpxchg(&device
->state
,
647 FW_DEVICE_SHUTDOWN
) != FW_DEVICE_GONE
)
650 fw_device_cdev_remove(device
);
651 device_for_each_child(&device
->device
, NULL
, shutdown_unit
);
652 device_unregister(&device
->device
);
654 down_write(&fw_device_rwsem
);
655 idr_remove(&fw_device_idr
, minor
);
656 up_write(&fw_device_rwsem
);
658 fw_device_put(device
);
661 static void fw_device_release(struct device
*dev
)
663 struct fw_device
*device
= fw_device(dev
);
664 struct fw_card
*card
= device
->card
;
668 * Take the card lock so we don't set this to NULL while a
669 * FW_NODE_UPDATED callback is being handled or while the
670 * bus manager work looks at this node.
672 spin_lock_irqsave(&card
->lock
, flags
);
673 device
->node
->data
= NULL
;
674 spin_unlock_irqrestore(&card
->lock
, flags
);
676 fw_node_put(device
->node
);
677 kfree(device
->config_rom
);
682 static struct device_type fw_device_type
= {
683 .release
= fw_device_release
,
686 static int update_unit(struct device
*dev
, void *data
)
688 struct fw_unit
*unit
= fw_unit(dev
);
689 struct fw_driver
*driver
= (struct fw_driver
*)dev
->driver
;
691 if (is_fw_unit(dev
) && driver
!= NULL
&& driver
->update
!= NULL
) {
693 driver
->update(unit
);
700 static void fw_device_update(struct work_struct
*work
)
702 struct fw_device
*device
=
703 container_of(work
, struct fw_device
, work
.work
);
705 fw_device_cdev_update(device
);
706 device_for_each_child(&device
->device
, NULL
, update_unit
);
710 * If a device was pending for deletion because its node went away but its
711 * bus info block and root directory header matches that of a newly discovered
712 * device, revive the existing fw_device.
713 * The newly allocated fw_device becomes obsolete instead.
715 static int lookup_existing_device(struct device
*dev
, void *data
)
717 struct fw_device
*old
= fw_device(dev
);
718 struct fw_device
*new = data
;
719 struct fw_card
*card
= new->card
;
722 down_read(&fw_device_rwsem
); /* serialize config_rom access */
723 spin_lock_irq(&card
->lock
); /* serialize node access */
725 if (memcmp(old
->config_rom
, new->config_rom
, 6 * 4) == 0 &&
726 atomic_cmpxchg(&old
->state
,
728 FW_DEVICE_RUNNING
) == FW_DEVICE_GONE
) {
729 struct fw_node
*current_node
= new->node
;
730 struct fw_node
*obsolete_node
= old
->node
;
732 new->node
= obsolete_node
;
733 new->node
->data
= new;
734 old
->node
= current_node
;
735 old
->node
->data
= old
;
737 old
->max_speed
= new->max_speed
;
738 old
->node_id
= current_node
->node_id
;
739 smp_wmb(); /* update node_id before generation */
740 old
->generation
= card
->generation
;
741 old
->config_rom_retries
= 0;
742 fw_notify("rediscovered device %s\n", dev_name(dev
));
744 PREPARE_DELAYED_WORK(&old
->work
, fw_device_update
);
745 schedule_delayed_work(&old
->work
, 0);
747 if (current_node
== card
->root_node
)
748 fw_schedule_bm_work(card
, 0);
753 spin_unlock_irq(&card
->lock
);
754 up_read(&fw_device_rwsem
);
759 static void fw_device_init(struct work_struct
*work
)
761 struct fw_device
*device
=
762 container_of(work
, struct fw_device
, work
.work
);
763 struct device
*revived_dev
;
767 * All failure paths here set node->data to NULL, so that we
768 * don't try to do device_for_each_child() on a kfree()'d
772 if (read_bus_info_block(device
, device
->generation
) < 0) {
773 if (device
->config_rom_retries
< MAX_RETRIES
&&
774 atomic_read(&device
->state
) == FW_DEVICE_INITIALIZING
) {
775 device
->config_rom_retries
++;
776 schedule_delayed_work(&device
->work
, RETRY_DELAY
);
778 fw_notify("giving up on config rom for node id %x\n",
780 if (device
->node
== device
->card
->root_node
)
781 fw_schedule_bm_work(device
->card
, 0);
782 fw_device_release(&device
->device
);
787 revived_dev
= device_find_child(device
->card
->device
,
788 device
, lookup_existing_device
);
790 put_device(revived_dev
);
791 fw_device_release(&device
->device
);
796 device_initialize(&device
->device
);
798 fw_device_get(device
);
799 down_write(&fw_device_rwsem
);
800 ret
= idr_pre_get(&fw_device_idr
, GFP_KERNEL
) ?
801 idr_get_new(&fw_device_idr
, device
, &minor
) :
803 up_write(&fw_device_rwsem
);
808 device
->device
.bus
= &fw_bus_type
;
809 device
->device
.type
= &fw_device_type
;
810 device
->device
.parent
= device
->card
->device
;
811 device
->device
.devt
= MKDEV(fw_cdev_major
, minor
);
812 dev_set_name(&device
->device
, "fw%d", minor
);
814 init_fw_attribute_group(&device
->device
,
815 fw_device_attributes
,
816 &device
->attribute_group
);
817 if (device_add(&device
->device
)) {
818 fw_error("Failed to add device.\n");
819 goto error_with_cdev
;
822 create_units(device
);
825 * Transition the device to running state. If it got pulled
826 * out from under us while we did the intialization work, we
827 * have to shut down the device again here. Normally, though,
828 * fw_node_event will be responsible for shutting it down when
829 * necessary. We have to use the atomic cmpxchg here to avoid
830 * racing with the FW_NODE_DESTROYED case in
833 if (atomic_cmpxchg(&device
->state
,
834 FW_DEVICE_INITIALIZING
,
835 FW_DEVICE_RUNNING
) == FW_DEVICE_GONE
) {
836 PREPARE_DELAYED_WORK(&device
->work
, fw_device_shutdown
);
837 schedule_delayed_work(&device
->work
, SHUTDOWN_DELAY
);
839 if (device
->config_rom_retries
)
840 fw_notify("created device %s: GUID %08x%08x, S%d00, "
841 "%d config ROM retries\n",
842 dev_name(&device
->device
),
843 device
->config_rom
[3], device
->config_rom
[4],
844 1 << device
->max_speed
,
845 device
->config_rom_retries
);
847 fw_notify("created device %s: GUID %08x%08x, S%d00\n",
848 dev_name(&device
->device
),
849 device
->config_rom
[3], device
->config_rom
[4],
850 1 << device
->max_speed
);
851 device
->config_rom_retries
= 0;
852 if (device
->card
->is_irm
)
853 fw_irm_set_broadcast_channel_register(&device
->device
,
858 * Reschedule the IRM work if we just finished reading the
859 * root node config rom. If this races with a bus reset we
860 * just end up running the IRM work a couple of extra times -
863 if (device
->node
== device
->card
->root_node
)
864 fw_schedule_bm_work(device
->card
, 0);
869 down_write(&fw_device_rwsem
);
870 idr_remove(&fw_device_idr
, minor
);
871 up_write(&fw_device_rwsem
);
873 fw_device_put(device
); /* fw_device_idr's reference */
875 put_device(&device
->device
); /* our reference */
881 REREAD_BIB_UNCHANGED
,
885 /* Reread and compare bus info block and header of root directory */
886 static int reread_bus_info_block(struct fw_device
*device
, int generation
)
891 for (i
= 0; i
< 6; i
++) {
892 if (read_rom(device
, generation
, i
, &q
) != RCODE_COMPLETE
)
893 return REREAD_BIB_ERROR
;
895 if (i
== 0 && q
== 0)
896 return REREAD_BIB_GONE
;
898 if (q
!= device
->config_rom
[i
])
899 return REREAD_BIB_CHANGED
;
902 return REREAD_BIB_UNCHANGED
;
905 static void fw_device_refresh(struct work_struct
*work
)
907 struct fw_device
*device
=
908 container_of(work
, struct fw_device
, work
.work
);
909 struct fw_card
*card
= device
->card
;
910 int node_id
= device
->node_id
;
912 switch (reread_bus_info_block(device
, device
->generation
)) {
913 case REREAD_BIB_ERROR
:
914 if (device
->config_rom_retries
< MAX_RETRIES
/ 2 &&
915 atomic_read(&device
->state
) == FW_DEVICE_INITIALIZING
) {
916 device
->config_rom_retries
++;
917 schedule_delayed_work(&device
->work
, RETRY_DELAY
/ 2);
923 case REREAD_BIB_GONE
:
926 case REREAD_BIB_UNCHANGED
:
927 if (atomic_cmpxchg(&device
->state
,
928 FW_DEVICE_INITIALIZING
,
929 FW_DEVICE_RUNNING
) == FW_DEVICE_GONE
)
932 fw_device_update(work
);
933 device
->config_rom_retries
= 0;
936 case REREAD_BIB_CHANGED
:
941 * Something changed. We keep things simple and don't investigate
942 * further. We just destroy all previous units and create new ones.
944 device_for_each_child(&device
->device
, NULL
, shutdown_unit
);
946 if (read_bus_info_block(device
, device
->generation
) < 0) {
947 if (device
->config_rom_retries
< MAX_RETRIES
&&
948 atomic_read(&device
->state
) == FW_DEVICE_INITIALIZING
) {
949 device
->config_rom_retries
++;
950 schedule_delayed_work(&device
->work
, RETRY_DELAY
);
957 create_units(device
);
959 if (atomic_cmpxchg(&device
->state
,
960 FW_DEVICE_INITIALIZING
,
961 FW_DEVICE_RUNNING
) == FW_DEVICE_GONE
)
964 fw_notify("refreshed device %s\n", dev_name(&device
->device
));
965 device
->config_rom_retries
= 0;
969 fw_notify("giving up on refresh of device %s\n", dev_name(&device
->device
));
971 atomic_set(&device
->state
, FW_DEVICE_GONE
);
972 PREPARE_DELAYED_WORK(&device
->work
, fw_device_shutdown
);
973 schedule_delayed_work(&device
->work
, SHUTDOWN_DELAY
);
975 if (node_id
== card
->root_node
->node_id
)
976 fw_schedule_bm_work(card
, 0);
979 void fw_node_event(struct fw_card
*card
, struct fw_node
*node
, int event
)
981 struct fw_device
*device
;
984 case FW_NODE_CREATED
:
985 case FW_NODE_LINK_ON
:
989 device
= kzalloc(sizeof(*device
), GFP_ATOMIC
);
994 * Do minimal intialization of the device here, the
995 * rest will happen in fw_device_init().
997 * Attention: A lot of things, even fw_device_get(),
998 * cannot be done before fw_device_init() finished!
999 * You can basically just check device->state and
1000 * schedule work until then, but only while holding
1003 atomic_set(&device
->state
, FW_DEVICE_INITIALIZING
);
1004 device
->card
= fw_card_get(card
);
1005 device
->node
= fw_node_get(node
);
1006 device
->node_id
= node
->node_id
;
1007 device
->generation
= card
->generation
;
1008 mutex_init(&device
->client_list_mutex
);
1009 INIT_LIST_HEAD(&device
->client_list
);
1012 * Set the node data to point back to this device so
1013 * FW_NODE_UPDATED callbacks can update the node_id
1014 * and generation for the device.
1016 node
->data
= device
;
1019 * Many devices are slow to respond after bus resets,
1020 * especially if they are bus powered and go through
1021 * power-up after getting plugged in. We schedule the
1022 * first config rom scan half a second after bus reset.
1024 INIT_DELAYED_WORK(&device
->work
, fw_device_init
);
1025 schedule_delayed_work(&device
->work
, INITIAL_DELAY
);
1028 case FW_NODE_INITIATED_RESET
:
1029 device
= node
->data
;
1033 device
->node_id
= node
->node_id
;
1034 smp_wmb(); /* update node_id before generation */
1035 device
->generation
= card
->generation
;
1036 if (atomic_cmpxchg(&device
->state
,
1038 FW_DEVICE_INITIALIZING
) == FW_DEVICE_RUNNING
) {
1039 PREPARE_DELAYED_WORK(&device
->work
, fw_device_refresh
);
1040 schedule_delayed_work(&device
->work
,
1041 node
== card
->local_node
? 0 : INITIAL_DELAY
);
1045 case FW_NODE_UPDATED
:
1046 if (!node
->link_on
|| node
->data
== NULL
)
1049 device
= node
->data
;
1050 device
->node_id
= node
->node_id
;
1051 smp_wmb(); /* update node_id before generation */
1052 device
->generation
= card
->generation
;
1053 if (atomic_read(&device
->state
) == FW_DEVICE_RUNNING
) {
1054 PREPARE_DELAYED_WORK(&device
->work
, fw_device_update
);
1055 schedule_delayed_work(&device
->work
, 0);
1059 case FW_NODE_DESTROYED
:
1060 case FW_NODE_LINK_OFF
:
1065 * Destroy the device associated with the node. There
1066 * are two cases here: either the device is fully
1067 * initialized (FW_DEVICE_RUNNING) or we're in the
1068 * process of reading its config rom
1069 * (FW_DEVICE_INITIALIZING). If it is fully
1070 * initialized we can reuse device->work to schedule a
1071 * full fw_device_shutdown(). If not, there's work
1072 * scheduled to read it's config rom, and we just put
1073 * the device in shutdown state to have that code fail
1074 * to create the device.
1076 device
= node
->data
;
1077 if (atomic_xchg(&device
->state
,
1078 FW_DEVICE_GONE
) == FW_DEVICE_RUNNING
) {
1079 PREPARE_DELAYED_WORK(&device
->work
, fw_device_shutdown
);
1080 schedule_delayed_work(&device
->work
,
1081 list_empty(&card
->link
) ? 0 : SHUTDOWN_DELAY
);