-/* -*- c-basic-offset: 8 -*-
- *
- * fw-device.c - Device probing and sysfs code.
+/*
+ * Device probing and sysfs code.
*
* Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net>
*
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
-#include <linux/module.h>
-#include <linux/wait.h>
-#include <linux/errno.h>
-#include <linux/kthread.h>
-#include <linux/device.h>
+#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 <asm/semaphore.h>
-#include "fw-transaction.h"
-#include "fw-topology.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)
{
vendor, model, specifier_id, version);
}
-static int
-fw_unit_uevent(struct device *dev, char **envp, int num_envp,
- char *buffer, int buffer_size)
+static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct fw_unit *unit = fw_unit(dev);
char modalias[64];
- int length = 0;
- int i = 0;
-
- if (!is_fw_unit(dev))
- goto out;
- get_modalias(unit, modalias, sizeof modalias);
+ get_modalias(unit, modalias, sizeof(modalias));
- if (add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "MODALIAS=%s", modalias))
+ if (add_uevent_var(env, "MODALIAS=%s", modalias))
return -ENOMEM;
- out:
- envp[i] = NULL;
-
return 0;
}
struct bus_type fw_bus_type = {
.name = "firewire",
.match = fw_unit_match,
- .uevent = fw_unit_uevent,
};
EXPORT_SYMBOL(fw_bus_type);
-extern struct fw_device *fw_device_get(struct fw_device *device)
+int fw_device_enable_phys_dma(struct fw_device *device)
{
- get_device(&device->device);
+ int generation = device->generation;
- return device;
+ /* 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;
+};
-extern void fw_device_put(struct fw_device *device)
+static ssize_t show_immediate(struct device *dev,
+ struct device_attribute *dattr, char *buf)
{
- put_device(&device->device);
+ 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;
}
-static void fw_device_release(struct device *dev)
+#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 fw_device *device = fw_device(dev);
- unsigned long flags;
+ 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;
- /* Take the card lock so we don't set this to NULL while a
- * FW_NODE_UPDATED callback is being handled. */
- spin_lock_irqsave(&device->card->lock, flags);
- device->node->data = NULL;
- spin_unlock_irqrestore(&device->card->lock, flags);
+ down_read(&fw_device_rwsem);
- fw_node_put(device->node);
- fw_card_put(device->card);
- kfree(device->config_rom);
- kfree(device);
+ 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;
}
-int fw_device_enable_phys_dma(struct fw_device *device)
+#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)
{
- return device->card->driver->enable_phys_dma(device->card,
- device->node_id,
- device->generation);
+ 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;
}
-EXPORT_SYMBOL(fw_device_enable_phys_dma);
-static ssize_t
-show_modalias_attribute(struct device *dev,
- struct device_attribute *attr, char *buf)
+static ssize_t modalias_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
struct fw_unit *unit = fw_unit(dev);
int length;
return length + 1;
}
-static struct device_attribute modalias_attribute = {
- .attr = { .name = "modalias", .mode = S_IRUGO, },
- .show = show_modalias_attribute,
+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
-show_config_rom_attribute(struct device *dev,
- struct device_attribute *attr, char *buf)
+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;
- memcpy(buf, device->config_rom, device->config_rom_length * 4);
+ down_read(&fw_device_rwsem);
+ length = device->config_rom_length * 4;
+ memcpy(buf, device->config_rom, length);
+ up_read(&fw_device_rwsem);
- return device->config_rom_length * 4;
+ return length;
}
-static struct device_attribute config_rom_attribute = {
- .attr = {.name = "config_rom", .mode = S_IRUGO,},
- .show = show_config_rom_attribute,
-};
-
-static ssize_t
-show_rom_index_attribute(struct device *dev,
+static ssize_t guid_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);
+ struct fw_device *device = fw_device(dev);
+ int ret;
- return snprintf(buf, PAGE_SIZE, "%d\n",
- (int)(unit->directory - device->config_rom));
-}
+ 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);
-static struct device_attribute rom_index_attribute = {
- .attr = { .name = "rom_index", .mode = S_IRUGO, },
- .show = show_rom_index_attribute,
-};
+ return ret;
+}
-struct read_quadlet_callback_data {
- struct completion done;
- int rcode;
- u32 data;
+static struct device_attribute fw_device_attributes[] = {
+ __ATTR_RO(config_rom),
+ __ATTR_RO(guid),
+ __ATTR_NULL,
};
-static void
-complete_transaction(struct fw_card *card, int rcode,
- void *payload, size_t length, void *data)
+static int read_rom(struct fw_device *device,
+ int generation, int index, u32 *data)
{
- struct read_quadlet_callback_data *callback_data = data;
+ int rcode;
- if (rcode == RCODE_COMPLETE)
- callback_data->data = be32_to_cpu(*(__be32 *)payload);
- callback_data->rcode = rcode;
- complete(&callback_data->done);
-}
+ /* device->node_id, accessed below, must not be older than generation */
+ smp_rmb();
-static int read_rom(struct fw_device *device, int index, u32 * data)
-{
- struct read_quadlet_callback_data callback_data;
- struct fw_transaction t;
- u64 offset;
+ 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);
- init_completion(&callback_data.done);
+ return rcode;
+}
- offset = 0xfffff0000400ULL + index * 4;
- fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST,
- device->node_id,
- device->generation, SCODE_100,
- offset, NULL, 4, complete_transaction, &callback_data);
+#define READ_BIB_ROM_SIZE 256
+#define READ_BIB_STACK_SIZE 16
- wait_for_completion(&callback_data.done);
+/*
+ * 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;
- *data = callback_data.data;
+ rom = kmalloc(sizeof(*rom) * READ_BIB_ROM_SIZE +
+ sizeof(*stack) * READ_BIB_STACK_SIZE, GFP_KERNEL);
+ if (rom == NULL)
+ return -ENOMEM;
- return callback_data.rcode;
-}
+ stack = &rom[READ_BIB_ROM_SIZE];
-static int read_bus_info_block(struct fw_device *device)
-{
- static u32 rom[256];
- u32 stack[16], sp, key;
- int i, end, length;
+ device->max_speed = SCODE_100;
/* First read the bus info block. */
for (i = 0; i < 5; i++) {
- if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
- return -1;
- /* As per IEEE1212 7.2, during power-up, devices can
+ 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. */
+ * retry mechanism will try again later.
+ */
if (i == 0 && rom[i] == 0)
- return -1;
+ 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
+ /*
+ * 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. */
+ * start things off.
+ */
length = i;
sp = 0;
stack[sp++] = 0xc0000005;
while (sp > 0) {
- /* Pop the next block reference of the stack. The
+ /*
+ * 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. */
+ * block.
+ */
key = stack[--sp];
i = key & 0xffffff;
- if (i >= ARRAY_SIZE(rom))
- /* The reference points outside the standard
- * config rom area, something's fishy. */
- return -1;
+ 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, i, &rom[i]) != RCODE_COMPLETE)
- return -1;
+ if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
+ goto out;
end = i + (rom[i] >> 16) + 1;
i++;
- if (end > ARRAY_SIZE(rom))
- /* This block extends outside standard config
+ 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. */
- return -1;
+ * device.
+ */
+ goto out;
- /* Now read in the block. If this is a directory
+ /*
+ * 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. */
+ * it references another block, and push it in that case.
+ */
while (i < end) {
- if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
- return -1;
+ if (read_rom(device, generation, i, &rom[i]) !=
+ RCODE_COMPLETE)
+ goto out;
if ((key >> 30) == 3 && (rom[i] >> 30) > 1 &&
- sp < ARRAY_SIZE(stack))
+ sp < READ_BIB_STACK_SIZE)
stack[sp++] = i + rom[i];
i++;
}
length = i;
}
- device->config_rom = kmalloc(length * 4, GFP_KERNEL);
- if (device->config_rom == NULL)
- return -1;
- memcpy(device->config_rom, rom, length * 4);
+ 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);
- return 0;
+ kfree(old_rom);
+ ret = 0;
+ device->cmc = rom[2] >> 30 & 1;
+ out:
+ kfree(rom);
+
+ return ret;
}
static void fw_unit_release(struct device *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->release == fw_unit_release;
+ return dev->type == &fw_unit_type;
}
static void create_units(struct fw_device *device)
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);
+ /*
+ * 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.release = fw_unit_release;
+ unit->device.type = &fw_unit_type;
unit->device.parent = &device->device;
- snprintf(unit->device.bus_id, sizeof unit->device.bus_id,
- "%s.%d", device->device.bus_id, i++);
+ dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++);
- if (device_register(&unit->device) < 0) {
- kfree(unit);
- continue;
- }
+ init_fw_attribute_group(&unit->device,
+ fw_unit_attributes,
+ &unit->attribute_group);
+ if (device_register(&unit->device) < 0)
+ goto skip_unit;
- if (device_create_file(&unit->device, &modalias_attribute) < 0) {
- device_unregister(&unit->device);
- kfree(unit);
- }
+ continue;
- if (device_create_file(&unit->device, &rom_index_attribute) < 0) {
- device_unregister(&unit->device);
- kfree(unit);
- }
+ skip_unit:
+ kfree(unit);
}
}
static int shutdown_unit(struct device *device, void *data)
{
- struct fw_unit *unit = fw_unit(device);
-
- if (is_fw_unit(device)) {
- device_remove_file(&unit->device, &modalias_attribute);
- device_unregister(&unit->device);
- }
+ device_unregister(device);
return 0;
}
-static DEFINE_IDR(fw_device_idr);
+/*
+ * 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_from_devt(dev_t devt)
+struct fw_device *fw_device_get_by_devt(dev_t devt)
{
struct fw_device *device;
- down_read(&fw_bus_type.subsys.rwsem);
+ down_read(&fw_device_rwsem);
device = idr_find(&fw_device_idr, MINOR(devt));
- up_read(&fw_bus_type.subsys.rwsem);
+ 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);
- down_write(&fw_bus_type.subsys.rwsem);
- idr_remove(&fw_device_idr, minor);
- up_write(&fw_bus_type.subsys.rwsem);
+ 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_remove_file(&device->device, &config_rom_attribute);
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);
}
-/* 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. */
+static void fw_device_release(struct device *dev)
+{
+ struct fw_device *device = fw_device(dev);
+ struct fw_card *card = device->card;
+ unsigned long flags;
-#define MAX_RETRIES 5
-#define RETRY_DELAY (2 * HZ)
-#define INITIAL_DELAY (HZ / 2)
+ /*
+ * 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);
- int minor, err;
+ struct device *revived_dev;
+ int minor, ret;
- /* All failure paths here set node->data to NULL, so that we
+ /*
+ * 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. */
+ * device.
+ */
- if (read_bus_info_block(device) < 0) {
- if (device->config_rom_retries < MAX_RETRIES) {
+ 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)
- schedule_delayed_work(&device->card->work, 0);
+ fw_schedule_bm_work(device->card, 0);
fw_device_release(&device->device);
}
return;
}
- err = -ENOMEM;
- down_write(&fw_bus_type.subsys.rwsem);
- if (idr_pre_get(&fw_device_idr, GFP_KERNEL))
- err = idr_get_new(&fw_device_idr, device, &minor);
- up_write(&fw_bus_type.subsys.rwsem);
- if (err < 0)
+ 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.release = fw_device_release;
+ device->device.type = &fw_device_type;
device->device.parent = device->card->device;
device->device.devt = MKDEV(fw_cdev_major, minor);
- snprintf(device->device.bus_id, sizeof device->device.bus_id,
- "fw%d", 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;
}
- if (device_create_file(&device->device, &config_rom_attribute) < 0) {
- fw_error("Failed to create config rom file.\n");
- goto error_with_device;
- }
-
create_units(device);
- /* Transition the device to running state. If it got pulled
+ /*
+ * 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(). */
+ * fw_node_event().
+ */
if (atomic_cmpxchg(&device->state,
- FW_DEVICE_INITIALIZING,
- FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN)
- fw_device_shutdown(&device->work.work);
- else
- fw_notify("created new fw device %s (%d config rom retries)\n",
- device->device.bus_id, device->config_rom_retries);
+ 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
+ /*
+ * 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. */
+ * pretty harmless.
+ */
if (device->node == device->card->root_node)
- schedule_delayed_work(&device->card->work, 0);
+ fw_schedule_bm_work(device->card, 0);
return;
- error_with_device:
- device_del(&device->device);
error_with_cdev:
- down_write(&fw_bus_type.subsys.rwsem);
+ down_write(&fw_device_rwsem);
idr_remove(&fw_device_idr, minor);
- up_write(&fw_bus_type.subsys.rwsem);
+ up_write(&fw_device_rwsem);
error:
- put_device(&device->device);
+ fw_device_put(device); /* fw_device_idr's reference */
+
+ put_device(&device->device); /* our reference */
}
-static int update_unit(struct device *dev, void *data)
+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)
{
- struct fw_unit *unit = fw_unit(dev);
- struct fw_driver *driver = (struct fw_driver *)dev->driver;
+ u32 q;
+ int i;
- if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) {
- down(&dev->sem);
- driver->update(unit);
- up(&dev->sem);
+ 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 0;
+ return REREAD_BIB_UNCHANGED;
}
-static void fw_device_update(struct work_struct *work)
+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;
- fw_device_cdev_update(device);
- device_for_each_child(&device->device, NULL, update_unit);
+ 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)
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(). We need the
- * card and node so we can read the config rom and we
- * need to do device_initialize() now so
- * device_for_each_child() in FW_NODE_UPDATED is
- * doesn't freak out. */
- device_initialize(&device->device);
+ /*
+ * 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
+ /*
+ * 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. */
+ * and generation for the device.
+ */
node->data = device;
- /* Many devices are slow to respond after bus resets,
+ /*
+ * 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. */
+ * 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);
if (!node->data)
break;
- /* Destroy the device associated with the node. There
+ /*
+ * 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
* 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. */
+ * to create the device.
+ */
device = node->data;
if (atomic_xchg(&device->state,
- FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) {
+ FW_DEVICE_GONE) == FW_DEVICE_RUNNING) {
PREPARE_DELAYED_WORK(&device->work, fw_device_shutdown);
- schedule_delayed_work(&device->work, 0);
+ schedule_delayed_work(&device->work,
+ list_empty(&card->link) ? 0 : SHUTDOWN_DELAY);
}
break;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff