#include <linux/idr.h>
#include <linux/rwsem.h>
#include <asm/semaphore.h>
+#include <asm/system.h>
#include <linux/ctype.h>
#include "fw-transaction.h"
#include "fw-topology.h"
}
static int
-fw_unit_uevent(struct device *dev, char **envp, int num_envp,
- char *buffer, int buffer_size)
+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;
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;
- envp[i] = NULL;
-
return 0;
}
};
EXPORT_SYMBOL(fw_bus_type);
-struct fw_device *fw_device_get(struct fw_device *device)
-{
- get_device(&device->device);
-
- return device;
-}
-
-void fw_device_put(struct fw_device *device)
-{
- put_device(&device->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;
/*
spin_unlock_irqrestore(&device->card->lock, flags);
fw_node_put(device->node);
- fw_card_put(device->card);
kfree(device->config_rom);
kfree(device);
+ atomic_dec(&card->device_count);
}
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,
- device->generation);
+ generation);
}
EXPORT_SYMBOL(fw_device_enable_phys_dma);
guid_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct fw_device *device = fw_device(dev);
- u64 guid;
-
- guid = ((u64)device->config_rom[3] << 32) | device->config_rom[4];
- return snprintf(buf, PAGE_SIZE, "0x%016llx\n",
- (unsigned long long)guid);
+ return snprintf(buf, PAGE_SIZE, "0x%08x%08x\n",
+ device->config_rom[3], device->config_rom[4]);
}
static struct device_attribute fw_device_attributes[] = {
complete(&callback_data->done);
}
-static int read_rom(struct fw_device *device, int index, u32 * data)
+static int
+read_rom(struct fw_device *device, int generation, int index, u32 *data)
{
struct read_quadlet_callback_data callback_data;
struct fw_transaction t;
u64 offset;
+ /* device->node_id, accessed below, must not be older than generation */
+ smp_rmb();
+
init_completion(&callback_data.done);
offset = 0xfffff0000400ULL + index * 4;
fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST,
- device->node_id, device->generation, device->max_speed,
+ device->node_id, generation, device->max_speed,
offset, NULL, 4, complete_transaction, &callback_data);
wait_for_completion(&callback_data.done);
return callback_data.rcode;
}
-static int read_bus_info_block(struct fw_device *device)
+/*
+ * 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)
{
static u32 rom[256];
u32 stack[16], sp, key;
/* First read the bus info block. */
for (i = 0; i < 5; i++) {
- if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
+ if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
return -1;
/*
* As per IEEE1212 7.2, during power-up, devices can
device->max_speed = device->card->link_speed;
while (device->max_speed > SCODE_100) {
- if (read_rom(device, 0, &dummy) == RCODE_COMPLETE)
+ if (read_rom(device, generation, 0, &dummy) ==
+ RCODE_COMPLETE)
break;
device->max_speed--;
}
return -1;
/* Read header quadlet for the block to get the length. */
- if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
+ if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE)
return -1;
end = i + (rom[i] >> 16) + 1;
i++;
* it references another block, and push it in that case.
*/
while (i < end) {
- if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
+ if (read_rom(device, generation, i, &rom[i]) !=
+ RCODE_COMPLETE)
return -1;
if ((key >> 30) == 3 && (rom[i] >> 30) > 1 &&
sp < ARRAY_SIZE(stack))
static 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(&idr_rwsem);
device = idr_find(&fw_device_idr, MINOR(devt));
+ if (device)
+ fw_device_get(device);
up_read(&idr_rwsem);
return device;
container_of(work, struct fw_device, work.work);
int minor = MINOR(device->device.devt);
- down_write(&idr_rwsem);
- idr_remove(&fw_device_idr, minor);
- up_write(&idr_rwsem);
-
fw_device_cdev_remove(device);
device_for_each_child(&device->device, NULL, shutdown_unit);
device_unregister(&device->device);
+
+ down_write(&idr_rwsem);
+ idr_remove(&fw_device_idr, minor);
+ up_write(&idr_rwsem);
+ fw_device_put(device);
}
static struct device_type fw_device_type = {
* 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 {
}
err = -ENOMEM;
+
+ fw_device_get(device);
down_write(&idr_rwsem);
if (idr_pre_get(&fw_device_idr, GFP_KERNEL))
err = idr_get_new(&fw_device_idr, device, &minor);
up_write(&idr_rwsem);
+
if (err < 0)
goto error;
*/
if (atomic_cmpxchg(&device->state,
FW_DEVICE_INITIALIZING,
- FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN)
+ FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) {
fw_device_shutdown(&device->work.work);
- else
- fw_notify("created new fw device %s "
- "(%d config rom retries, S%d00)\n",
- device->device.bus_id, device->config_rom_retries,
- 1 << device->max_speed);
+ } else {
+ if (device->config_rom_retries)
+ fw_notify("created device %s: GUID %08x%08x, S%d00, "
+ "%d config ROM retries\n",
+ device->device.bus_id,
+ 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",
+ device->device.bus_id,
+ device->config_rom[3], device->config_rom[4],
+ 1 << device->max_speed);
+ }
/*
* Reschedule the IRM work if we just finished reading the
idr_remove(&fw_device_idr, minor);
up_write(&idr_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)
*/
device_initialize(&device->device);
atomic_set(&device->state, FW_DEVICE_INITIALIZING);
- device->card = fw_card_get(card);
+ atomic_inc(&card->device_count);
+ device->card = card;
device->node = fw_node_get(node);
device->node_id = node->node_id;
device->generation = card->generation;
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);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff