diff options
Diffstat (limited to 'drivers/firewire/fw-device.c')
| -rw-r--r-- | drivers/firewire/fw-device.c | 1122 |
1 files changed, 0 insertions, 1122 deletions
diff --git a/drivers/firewire/fw-device.c b/drivers/firewire/fw-device.c deleted file mode 100644 index a47e2129d83..00000000000 --- a/drivers/firewire/fw-device.c +++ /dev/null @@ -1,1122 +0,0 @@ -/* - * Device probing and sysfs code. - * - * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software Foundation, - * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - */ - -#include <linux/ctype.h> -#include <linux/delay.h> -#include <linux/device.h> -#include <linux/errno.h> -#include <linux/idr.h> -#include <linux/jiffies.h> -#include <linux/kobject.h> -#include <linux/list.h> -#include <linux/mutex.h> -#include <linux/rwsem.h> -#include <linux/semaphore.h> -#include <linux/spinlock.h> -#include <linux/string.h> -#include <linux/workqueue.h> - -#include <asm/system.h> - -#include "fw-device.h" -#include "fw-topology.h" -#include "fw-transaction.h" - -void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p) -{ - ci->p = p + 1; - ci->end = ci->p + (p[0] >> 16); -} -EXPORT_SYMBOL(fw_csr_iterator_init); - -int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value) -{ - *key = *ci->p >> 24; - *value = *ci->p & 0xffffff; - - return ci->p++ < ci->end; -} -EXPORT_SYMBOL(fw_csr_iterator_next); - -static int is_fw_unit(struct device *dev); - -static int match_unit_directory(u32 * directory, const struct fw_device_id *id) -{ - struct fw_csr_iterator ci; - int key, value, match; - - match = 0; - fw_csr_iterator_init(&ci, directory); - while (fw_csr_iterator_next(&ci, &key, &value)) { - if (key == CSR_VENDOR && value == id->vendor) - match |= FW_MATCH_VENDOR; - if (key == CSR_MODEL && value == id->model) - match |= FW_MATCH_MODEL; - if (key == CSR_SPECIFIER_ID && value == id->specifier_id) - match |= FW_MATCH_SPECIFIER_ID; - if (key == CSR_VERSION && value == id->version) - match |= FW_MATCH_VERSION; - } - - return (match & id->match_flags) == id->match_flags; -} - -static int fw_unit_match(struct device *dev, struct device_driver *drv) -{ - struct fw_unit *unit = fw_unit(dev); - struct fw_driver *driver = fw_driver(drv); - int i; - - /* We only allow binding to fw_units. */ - if (!is_fw_unit(dev)) - return 0; - - for (i = 0; driver->id_table[i].match_flags != 0; i++) { - if (match_unit_directory(unit->directory, &driver->id_table[i])) - return 1; - } - - return 0; -} - -static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) -{ - struct fw_device *device = fw_device(unit->device.parent); - struct fw_csr_iterator ci; - - int key, value; - int vendor = 0; - int model = 0; - int specifier_id = 0; - int version = 0; - - fw_csr_iterator_init(&ci, &device->config_rom[5]); - while (fw_csr_iterator_next(&ci, &key, &value)) { - switch (key) { - case CSR_VENDOR: - vendor = value; - break; - case CSR_MODEL: - model = value; - break; - } - } - - fw_csr_iterator_init(&ci, unit->directory); - while (fw_csr_iterator_next(&ci, &key, &value)) { - switch (key) { - case CSR_SPECIFIER_ID: - specifier_id = value; - break; - case CSR_VERSION: - version = value; - break; - } - } - - return snprintf(buffer, buffer_size, - "ieee1394:ven%08Xmo%08Xsp%08Xver%08X", - vendor, model, specifier_id, version); -} - -static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env) -{ - struct fw_unit *unit = fw_unit(dev); - char modalias[64]; - - get_modalias(unit, modalias, sizeof(modalias)); - - if (add_uevent_var(env, "MODALIAS=%s", modalias)) - return -ENOMEM; - - return 0; -} - -struct bus_type fw_bus_type = { - .name = "firewire", - .match = fw_unit_match, -}; -EXPORT_SYMBOL(fw_bus_type); - -int fw_device_enable_phys_dma(struct fw_device *device) -{ - int generation = device->generation; - - /* device->node_id, accessed below, must not be older than generation */ - smp_rmb(); - - return device->card->driver->enable_phys_dma(device->card, - device->node_id, - generation); -} -EXPORT_SYMBOL(fw_device_enable_phys_dma); - -struct config_rom_attribute { - struct device_attribute attr; - u32 key; -}; - -static ssize_t show_immediate(struct device *dev, - struct device_attribute *dattr, char *buf) -{ - struct config_rom_attribute *attr = - container_of(dattr, struct config_rom_attribute, attr); - struct fw_csr_iterator ci; - u32 *dir; - int key, value, ret = -ENOENT; - - down_read(&fw_device_rwsem); - - if (is_fw_unit(dev)) - dir = fw_unit(dev)->directory; - else - dir = fw_device(dev)->config_rom + 5; - - fw_csr_iterator_init(&ci, dir); - while (fw_csr_iterator_next(&ci, &key, &value)) - if (attr->key == key) { - ret = snprintf(buf, buf ? PAGE_SIZE : 0, - "0x%06x\n", value); - break; - } - - up_read(&fw_device_rwsem); - - return ret; -} - -#define IMMEDIATE_ATTR(name, key) \ - { __ATTR(name, S_IRUGO, show_immediate, NULL), key } - -static ssize_t show_text_leaf(struct device *dev, - struct device_attribute *dattr, char *buf) -{ - struct config_rom_attribute *attr = - container_of(dattr, struct config_rom_attribute, attr); - struct fw_csr_iterator ci; - u32 *dir, *block = NULL, *p, *end; - int length, key, value, last_key = 0, ret = -ENOENT; - char *b; - - down_read(&fw_device_rwsem); - - if (is_fw_unit(dev)) - dir = fw_unit(dev)->directory; - else - dir = fw_device(dev)->config_rom + 5; - - fw_csr_iterator_init(&ci, dir); - while (fw_csr_iterator_next(&ci, &key, &value)) { - if (attr->key == last_key && - key == (CSR_DESCRIPTOR | CSR_LEAF)) - block = ci.p - 1 + value; - last_key = key; - } - - if (block == NULL) - goto out; - - length = min(block[0] >> 16, 256U); - if (length < 3) - goto out; - - if (block[1] != 0 || block[2] != 0) - /* Unknown encoding. */ - goto out; - - if (buf == NULL) { - ret = length * 4; - goto out; - } - - b = buf; - end = &block[length + 1]; - for (p = &block[3]; p < end; p++, b += 4) - * (u32 *) b = (__force u32) __cpu_to_be32(*p); - - /* Strip trailing whitespace and add newline. */ - while (b--, (isspace(*b) || *b == '\0') && b > buf); - strcpy(b + 1, "\n"); - ret = b + 2 - buf; - out: - up_read(&fw_device_rwsem); - - return ret; -} - -#define TEXT_LEAF_ATTR(name, key) \ - { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key } - -static struct config_rom_attribute config_rom_attributes[] = { - IMMEDIATE_ATTR(vendor, CSR_VENDOR), - IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION), - IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID), - IMMEDIATE_ATTR(version, CSR_VERSION), - IMMEDIATE_ATTR(model, CSR_MODEL), - TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR), - TEXT_LEAF_ATTR(model_name, CSR_MODEL), - TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION), -}; - -static void init_fw_attribute_group(struct device *dev, - struct device_attribute *attrs, - struct fw_attribute_group *group) -{ - struct device_attribute *attr; - int i, j; - - for (j = 0; attrs[j].attr.name != NULL; j++) - group->attrs[j] = &attrs[j].attr; - - for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) { - attr = &config_rom_attributes[i].attr; - if (attr->show(dev, attr, NULL) < 0) - continue; - group->attrs[j++] = &attr->attr; - } - - BUG_ON(j >= ARRAY_SIZE(group->attrs)); - group->attrs[j++] = NULL; - group->groups[0] = &group->group; - group->groups[1] = NULL; - group->group.attrs = group->attrs; - dev->groups = group->groups; -} - -static ssize_t modalias_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct fw_unit *unit = fw_unit(dev); - int length; - - length = get_modalias(unit, buf, PAGE_SIZE); - strcpy(buf + length, "\n"); - - return length + 1; -} - -static ssize_t rom_index_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct fw_device *device = fw_device(dev->parent); - struct fw_unit *unit = fw_unit(dev); - - return snprintf(buf, PAGE_SIZE, "%d\n", - (int)(unit->directory - device->config_rom)); -} - -static struct device_attribute fw_unit_attributes[] = { - __ATTR_RO(modalias), - __ATTR_RO(rom_index), - __ATTR_NULL, -}; - -static ssize_t config_rom_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct fw_device *device = fw_device(dev); - size_t length; - - down_read(&fw_device_rwsem); - length = device->config_rom_length * 4; - memcpy(buf, device->config_rom, length); - up_read(&fw_device_rwsem); - - return length; -} - -static ssize_t guid_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct fw_device *device = fw_device(dev); - int ret; - - down_read(&fw_device_rwsem); - ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n", - device->config_rom[3], device->config_rom[4]); - up_read(&fw_device_rwsem); - - return ret; -} - -static struct device_attribute fw_device_attributes[] = { - __ATTR_RO(config_rom), - __ATTR_RO(guid), - __ATTR_NULL, -}; - -static int read_rom(struct fw_device *device, - int generation, int index, u32 *data) -{ - int rcode; - - /* device->node_id, accessed below, must not be older than generation */ - smp_rmb(); - - rcode = fw_run_transaction(device->card, TCODE_READ_QUADLET_REQUEST, - device->node_id, generation, device->max_speed, - (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4, - data, 4); - be32_to_cpus(data); - - return rcode; -} - -#define READ_BIB_ROM_SIZE 256 -#define READ_BIB_STACK_SIZE 16 - -/* - * Read the bus info block, perform a speed probe, and read all of the rest of - * the config ROM. We do all this with a cached bus generation. If the bus - * generation changes under us, read_bus_info_block will fail and get retried. - * It's better to start all over in this case because the node from which we - * are reading the ROM may have changed the ROM during the reset. - */ -static int read_bus_info_block(struct fw_device *device, int generation) -{ - u32 *rom, *stack, *old_rom, *new_rom; - u32 sp, key; - int i, end, length, ret = -1; - - rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE + - sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL); - if (rom == NULL) - return -ENOMEM; - - stack = &rom[READ_BIB_ROM_SIZE]; - - device->max_speed = SCODE_100; - - /* First read the bus info block. */ - for (i = 0; i < 5; i++) { - if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) - goto out; - /* - * As per IEEE1212 7.2, during power-up, devices can - * reply with a 0 for the first quadlet of the config - * rom to indicate that they are booting (for example, - * if the firmware is on the disk of a external - * harddisk). In that case we just fail, and the - * retry mechanism will try again later. - */ - if (i == 0 && rom[i] == 0) - goto out; - } - - device->max_speed = device->node->max_speed; - - /* - * Determine the speed of - * - devices with link speed less than PHY speed, - * - devices with 1394b PHY (unless only connected to 1394a PHYs), - * - all devices if there are 1394b repeaters. - * Note, we cannot use the bus info block's link_spd as starting point - * because some buggy firmwares set it lower than necessary and because - * 1394-1995 nodes do not have the field. - */ - if ((rom[2] & 0x7) < device->max_speed || - device->max_speed == SCODE_BETA || - device->card->beta_repeaters_present) { - u32 dummy; - - /* for S1600 and S3200 */ - if (device->max_speed == SCODE_BETA) - device->max_speed = device->card->link_speed; - - while (device->max_speed > SCODE_100) { - if (read_rom(device, generation, 0, &dummy) == - RCODE_COMPLETE) - break; - device->max_speed--; - } - } - - /* - * Now parse the config rom. The config rom is a recursive - * directory structure so we parse it using a stack of - * references to the blocks that make up the structure. We - * push a reference to the root directory on the stack to - * start things off. - */ - length = i; - sp = 0; - stack[sp++] = 0xc0000005; - while (sp > 0) { - /* - * Pop the next block reference of the stack. The - * lower 24 bits is the offset into the config rom, - * the upper 8 bits are the type of the reference the - * block. - */ - key = stack[--sp]; - i = key & 0xffffff; - if (i >= READ_BIB_ROM_SIZE) - /* - * The reference points outside the standard - * config rom area, something's fishy. - */ - goto out; - - /* Read header quadlet for the block to get the length. */ - if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) - goto out; - end = i + (rom[i] >> 16) + 1; - i++; - if (end > READ_BIB_ROM_SIZE) - /* - * This block extends outside standard config - * area (and the array we're reading it - * into). That's broken, so ignore this - * device. - */ - goto out; - - /* - * Now read in the block. If this is a directory - * block, check the entries as we read them to see if - * it references another block, and push it in that case. - */ - while (i < end) { - if (read_rom(device, generation, i, &rom[i]) != - RCODE_COMPLETE) - goto out; - if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && - sp < READ_BIB_STACK_SIZE) - stack[sp++] = i + rom[i]; - i++; - } - if (length < i) - length = i; - } - - old_rom = device->config_rom; - new_rom = kmemdup(rom, length * 4, GFP_KERNEL); - if (new_rom == NULL) - goto out; - - down_write(&fw_device_rwsem); - device->config_rom = new_rom; - device->config_rom_length = length; - up_write(&fw_device_rwsem); - - kfree(old_rom); - ret = 0; - device->cmc = rom[2] >> 30 & 1; - out: - kfree(rom); - - return ret; -} - -static void fw_unit_release(struct device *dev) -{ - struct fw_unit *unit = fw_unit(dev); - - kfree(unit); -} - -static struct device_type fw_unit_type = { - .uevent = fw_unit_uevent, - .release = fw_unit_release, -}; - -static int is_fw_unit(struct device *dev) -{ - return dev->type == &fw_unit_type; -} - -static void create_units(struct fw_device *device) -{ - struct fw_csr_iterator ci; - struct fw_unit *unit; - int key, value, i; - - i = 0; - fw_csr_iterator_init(&ci, &device->config_rom[5]); - while (fw_csr_iterator_next(&ci, &key, &value)) { - if (key != (CSR_UNIT | CSR_DIRECTORY)) - continue; - - /* - * Get the address of the unit directory and try to - * match the drivers id_tables against it. - */ - unit = kzalloc(sizeof(*unit), GFP_KERNEL); - if (unit == NULL) { - fw_error("failed to allocate memory for unit\n"); - continue; - } - - unit->directory = ci.p + value - 1; - unit->device.bus = &fw_bus_type; - unit->device.type = &fw_unit_type; - unit->device.parent = &device->device; - dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++); - - init_fw_attribute_group(&unit->device, - fw_unit_attributes, - &unit->attribute_group); - if (device_register(&unit->device) < 0) - goto skip_unit; - - continue; - - skip_unit: - kfree(unit); - } -} - -static int shutdown_unit(struct device *device, void *data) -{ - device_unregister(device); - - return 0; -} - -/* - * fw_device_rwsem acts as dual purpose mutex: - * - serializes accesses to fw_device_idr, - * - serializes accesses to fw_device.config_rom/.config_rom_length and - * fw_unit.directory, unless those accesses happen at safe occasions - */ -DECLARE_RWSEM(fw_device_rwsem); - -DEFINE_IDR(fw_device_idr); -int fw_cdev_major; - -struct fw_device *fw_device_get_by_devt(dev_t devt) -{ - struct fw_device *device; - - down_read(&fw_device_rwsem); - device = idr_find(&fw_device_idr, MINOR(devt)); - if (device) - fw_device_get(device); - up_read(&fw_device_rwsem); - - return device; -} - -/* - * These defines control the retry behavior for reading the config - * rom. It shouldn't be necessary to tweak these; if the device - * doesn't respond to a config rom read within 10 seconds, it's not - * going to respond at all. As for the initial delay, a lot of - * devices will be able to respond within half a second after bus - * reset. On the other hand, it's not really worth being more - * aggressive than that, since it scales pretty well; if 10 devices - * are plugged in, they're all getting read within one second. - */ - -#define MAX_RETRIES 10 -#define RETRY_DELAY (3 * HZ) -#define INITIAL_DELAY (HZ / 2) -#define SHUTDOWN_DELAY (2 * HZ) - -static void fw_device_shutdown(struct work_struct *work) -{ - struct fw_device *device = - container_of(work, struct fw_device, work.work); - int minor = MINOR(device->device.devt); - - if (time_is_after_jiffies(device->card->reset_jiffies + SHUTDOWN_DELAY) - && !list_empty(&device->card->link)) { - schedule_delayed_work(&device->work, SHUTDOWN_DELAY); - return; - } - - if (atomic_cmpxchg(&device->state, - FW_DEVICE_GONE, - FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE) - return; - - fw_device_cdev_remove(device); - device_for_each_child(&device->device, NULL, shutdown_unit); - device_unregister(&device->device); - - down_write(&fw_device_rwsem); - idr_remove(&fw_device_idr, minor); - up_write(&fw_device_rwsem); - - fw_device_put(device); -} - -static void fw_device_release(struct device *dev) -{ - struct fw_device *device = fw_device(dev); - struct fw_card *card = device->card; - unsigned long flags; - - /* - * Take the card lock so we don't set this to NULL while a - * FW_NODE_UPDATED callback is being handled or while the - * bus manager work looks at this node. - */ - spin_lock_irqsave(&card->lock, flags); - device->node->data = NULL; - spin_unlock_irqrestore(&card->lock, flags); - - fw_node_put(device->node); - kfree(device->config_rom); - kfree(device); - fw_card_put(card); -} - -static struct device_type fw_device_type = { - .release = fw_device_release, -}; - -static int update_unit(struct device *dev, void *data) -{ - struct fw_unit *unit = fw_unit(dev); - struct fw_driver *driver = (struct fw_driver *)dev->driver; - - if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) { - down(&dev->sem); - driver->update(unit); - up(&dev->sem); - } - - return 0; -} - -static void fw_device_update(struct work_struct *work) -{ - struct fw_device *device = - container_of(work, struct fw_device, work.work); - - fw_device_cdev_update(device); - device_for_each_child(&device->device, NULL, update_unit); -} - -/* - * If a device was pending for deletion because its node went away but its - * bus info block and root directory header matches that of a newly discovered - * device, revive the existing fw_device. - * The newly allocated fw_device becomes obsolete instead. - */ -static int lookup_existing_device(struct device *dev, void *data) -{ - struct fw_device *old = fw_device(dev); - struct fw_device *new = data; - struct fw_card *card = new->card; - int match = 0; - - down_read(&fw_device_rwsem); /* serialize config_rom access */ - spin_lock_irq(&card->lock); /* serialize node access */ - - if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 && - atomic_cmpxchg(&old->state, - FW_DEVICE_GONE, - FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { - struct fw_node *current_node = new->node; - struct fw_node *obsolete_node = old->node; - - new->node = obsolete_node; - new->node->data = new; - old->node = current_node; - old->node->data = old; - - old->max_speed = new->max_speed; - old->node_id = current_node->node_id; - smp_wmb(); /* update node_id before generation */ - old->generation = card->generation; - old->config_rom_retries = 0; - fw_notify("rediscovered device %s\n", dev_name(dev)); - - PREPARE_DELAYED_WORK(&old->work, fw_device_update); - schedule_delayed_work(&old->work, 0); - - if (current_node == card->root_node) - fw_schedule_bm_work(card, 0); - - match = 1; - } - - spin_unlock_irq(&card->lock); - up_read(&fw_device_rwsem); - - return match; -} - -enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, }; - -void fw_device_set_broadcast_channel(struct fw_device *device, int generation) -{ - struct fw_card *card = device->card; - __be32 data; - int rcode; - - if (!card->broadcast_channel_allocated) - return; - - if (device->bc_implemented == BC_UNKNOWN) { - rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST, - device->node_id, generation, device->max_speed, - CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, - &data, 4); - switch (rcode) { - case RCODE_COMPLETE: - if (data & cpu_to_be32(1 << 31)) { - device->bc_implemented = BC_IMPLEMENTED; - break; - } - /* else fall through to case address error */ - case RCODE_ADDRESS_ERROR: - device->bc_implemented = BC_UNIMPLEMENTED; - } - } - - if (device->bc_implemented == BC_IMPLEMENTED) { - data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL | - BROADCAST_CHANNEL_VALID); - fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST, - device->node_id, generation, device->max_speed, - CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, - &data, 4); - } -} - -static void fw_device_init(struct work_struct *work) -{ - struct fw_device *device = - container_of(work, struct fw_device, work.work); - struct device *revived_dev; - int minor, ret; - - /* - * All failure paths here set node->data to NULL, so that we - * don't try to do device_for_each_child() on a kfree()'d - * device. - */ - - if (read_bus_info_block(device, device->generation) < 0) { - if (device->config_rom_retries < MAX_RETRIES && - atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { - device->config_rom_retries++; - schedule_delayed_work(&device->work, RETRY_DELAY); - } else { - fw_notify("giving up on config rom for node id %x\n", - device->node_id); - if (device->node == device->card->root_node) - fw_schedule_bm_work(device->card, 0); - fw_device_release(&device->device); - } - return; - } - - revived_dev = device_find_child(device->card->device, - device, lookup_existing_device); - if (revived_dev) { - put_device(revived_dev); - fw_device_release(&device->device); - - return; - } - - device_initialize(&device->device); - - fw_device_get(device); - down_write(&fw_device_rwsem); - ret = idr_pre_get(&fw_device_idr, GFP_KERNEL) ? - idr_get_new(&fw_device_idr, device, &minor) : - -ENOMEM; - up_write(&fw_device_rwsem); - - if (ret < 0) - goto error; - - device->device.bus = &fw_bus_type; - device->device.type = &fw_device_type; - device->device.parent = device->card->device; - device->device.devt = MKDEV(fw_cdev_major, minor); - dev_set_name(&device->device, "fw%d", minor); - - init_fw_attribute_group(&device->device, - fw_device_attributes, - &device->attribute_group); - if (device_add(&device->device)) { - fw_error("Failed to add device.\n"); - goto error_with_cdev; - } - - create_units(device); - - /* - * Transition the device to running state. If it got pulled - * out from under us while we did the intialization work, we - * have to shut down the device again here. Normally, though, - * fw_node_event will be responsible for shutting it down when - * necessary. We have to use the atomic cmpxchg here to avoid - * racing with the FW_NODE_DESTROYED case in - * fw_node_event(). - */ - if (atomic_cmpxchg(&device->state, - FW_DEVICE_INITIALIZING, - FW_DEVICE_RUNNING) == FW_DEVICE_GONE) { - PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); - schedule_delayed_work(&device->work, SHUTDOWN_DELAY); - } else { - if (device->config_rom_retries) - fw_notify("created device %s: GUID %08x%08x, S%d00, " - "%d config ROM retries\n", - dev_name(&device->device), - device->config_rom[3], device->config_rom[4], - 1 << device->max_speed, - device->config_rom_retries); - else - fw_notify("created device %s: GUID %08x%08x, S%d00\n", - dev_name(&device->device), - device->config_rom[3], device->config_rom[4], - 1 << device->max_speed); - device->config_rom_retries = 0; - - fw_device_set_broadcast_channel(device, device->generation); - } - - /* - * Reschedule the IRM work if we just finished reading the - * root node config rom. If this races with a bus reset we - * just end up running the IRM work a couple of extra times - - * pretty harmless. - */ - if (device->node == device->card->root_node) - fw_schedule_bm_work(device->card, 0); - - return; - - error_with_cdev: - down_write(&fw_device_rwsem); - idr_remove(&fw_device_idr, minor); - up_write(&fw_device_rwsem); - error: - fw_device_put(device); /* fw_device_idr's reference */ - - put_device(&device->device); /* our reference */ -} - -enum { - REREAD_BIB_ERROR, - REREAD_BIB_GONE, - REREAD_BIB_UNCHANGED, - REREAD_BIB_CHANGED, -}; - -/* Reread and compare bus info block and header of root directory */ -static int reread_bus_info_block(struct fw_device *device, int generation) -{ - u32 q; - int i; - - for (i = 0; i < 6; i++) { - if (read_rom(device, generation, i, &q) != RCODE_COMPLETE) - return REREAD_BIB_ERROR; - - if (i == 0 && q == 0) - return REREAD_BIB_GONE; - - if (q != device->config_rom[i]) - return REREAD_BIB_CHANGED; - } - - return REREAD_BIB_UNCHANGED; -} - -static void fw_device_refresh(struct work_struct *work) -{ - struct fw_device *device = - container_of(work, struct fw_device, work.work); - struct fw_card *card = device->card; - int node_id = device->node_id; - - switch (reread_bus_info_block(device, device->generation)) { - case REREAD_BIB_ERROR: - if (device->config_rom_retries < MAX_RETRIES / 2 && - atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { - device->config_rom_retries++; - schedule_delayed_work(&device->work, RETRY_DELAY / 2); - - return; - } - goto give_up; - - case REREAD_BIB_GONE: - goto gone; - - case REREAD_BIB_UNCHANGED: - if (atomic_cmpxchg(&device->state, - FW_DEVICE_INITIALIZING, - FW_DEVICE_RUNNING) == FW_DEVICE_GONE) - goto gone; - - fw_device_update(work); - device->config_rom_retries = 0; - goto out; - - case REREAD_BIB_CHANGED: - break; - } - - /* - * Something changed. We keep things simple and don't investigate - * further. We just destroy all previous units and create new ones. - */ - device_for_each_child(&device->device, NULL, shutdown_unit); - - if (read_bus_info_block(device, device->generation) < 0) { - if (device->config_rom_retries < MAX_RETRIES && - atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { - device->config_rom_retries++; - schedule_delayed_work(&device->work, RETRY_DELAY); - - return; - } - goto give_up; - } - - create_units(device); - - if (atomic_cmpxchg(&device->state, - FW_DEVICE_INITIALIZING, - FW_DEVICE_RUNNING) == FW_DEVICE_GONE) - goto gone; - - fw_notify("refreshed device %s\n", dev_name(&device->device)); - device->config_rom_retries = 0; - goto out; - - give_up: - fw_notify("giving up on refresh of device %s\n", dev_name(&device->device)); - gone: - atomic_set(&device->state, FW_DEVICE_GONE); - PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); - schedule_delayed_work(&device->work, SHUTDOWN_DELAY); - out: - if (node_id == card->root_node->node_id) - fw_schedule_bm_work(card, 0); -} - -void fw_node_event(struct fw_card *card, struct fw_node *node, int event) -{ - struct fw_device *device; - - switch (event) { - case FW_NODE_CREATED: - case FW_NODE_LINK_ON: - if (!node->link_on) - break; - create: - device = kzalloc(sizeof(*device), GFP_ATOMIC); - if (device == NULL) - break; - - /* - * Do minimal intialization of the device here, the - * rest will happen in fw_device_init(). - * - * Attention: A lot of things, even fw_device_get(), - * cannot be done before fw_device_init() finished! - * You can basically just check device->state and - * schedule work until then, but only while holding - * card->lock. - */ - atomic_set(&device->state, FW_DEVICE_INITIALIZING); - device->card = fw_card_get(card); - device->node = fw_node_get(node); - device->node_id = node->node_id; - device->generation = card->generation; - mutex_init(&device->client_list_mutex); - INIT_LIST_HEAD(&device->client_list); - - /* - * Set the node data to point back to this device so - * FW_NODE_UPDATED callbacks can update the node_id - * and generation for the device. - */ - node->data = device; - - /* - * Many devices are slow to respond after bus resets, - * especially if they are bus powered and go through - * power-up after getting plugged in. We schedule the - * first config rom scan half a second after bus reset. - */ - INIT_DELAYED_WORK(&device->work, fw_device_init); - schedule_delayed_work(&device->work, INITIAL_DELAY); - break; - - case FW_NODE_INITIATED_RESET: - device = node->data; - if (device == NULL) - goto create; - - device->node_id = node->node_id; - smp_wmb(); /* update node_id before generation */ - device->generation = card->generation; - if (atomic_cmpxchg(&device->state, - FW_DEVICE_RUNNING, - FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) { - PREPARE_DELAYED_WORK(&device->work, fw_device_refresh); - schedule_delayed_work(&device->work, - node == card->local_node ? 0 : INITIAL_DELAY); - } - break; - - case FW_NODE_UPDATED: - if (!node->link_on || node->data == NULL) - break; - - device = node->data; - device->node_id = node->node_id; - smp_wmb(); /* update node_id before generation */ - device->generation = card->generation; - if (atomic_read(&device->state) == FW_DEVICE_RUNNING) { - PREPARE_DELAYED_WORK(&device->work, fw_device_update); - schedule_delayed_work(&device->work, 0); - } - break; - - case FW_NODE_DESTROYED: - case FW_NODE_LINK_OFF: - if (!node->data) - break; - - /* - * Destroy the device associated with the node. There - * are two cases here: either the device is fully - * initialized (FW_DEVICE_RUNNING) or we're in the - * process of reading its config rom - * (FW_DEVICE_INITIALIZING). If it is fully - * initialized we can reuse device->work to schedule a - * full fw_device_shutdown(). If not, there's work - * scheduled to read it's config rom, and we just put - * the device in shutdown state to have that code fail - * to create the device. - */ - device = node->data; - if (atomic_xchg(&device->state, - FW_DEVICE_GONE) == FW_DEVICE_RUNNING) { - PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown); - schedule_delayed_work(&device->work, - list_empty(&card->link) ? 0 : SHUTDOWN_DELAY); - } - break; - } -} |