Next up:
firewire: core: drop unused call parameters of close_transaction
firewire: core: increase bus manager grace period
firewire: core: simplify broadcast channel allocation
firewire: core: optimize propagation of BROADCAST_CHANNEL
drivers/firewire/fw-card.c | 214 +++++-------------------------
drivers/firewire/fw-device.c | 45 +++++-
drivers/firewire/fw-device.h | 5
drivers/firewire/fw-topology.c | 1
drivers/firewire/fw-transaction.c | 17 +-
drivers/firewire/fw-transaction.h | 6
6 files changed, 96 insertions(+), 192 deletions(-)
--
Stefan Richter
-=====-==--= --== -=-=-
http://arcgraph.de/sr/
All callers inserted NULL and 0 here.
Signed-off-by: Stefan Richter <[email protected]>
---
drivers/firewire/fw-transaction.c | 17 ++++++++---------
1 file changed, 8 insertions(+), 9 deletions(-)
Index: linux/drivers/firewire/fw-transaction.c
===================================================================
--- linux.orig/drivers/firewire/fw-transaction.c
+++ linux/drivers/firewire/fw-transaction.c
@@ -65,8 +65,7 @@
#define PHY_IDENTIFIER(id) ((id) << 30)
static int close_transaction(struct fw_transaction *transaction,
- struct fw_card *card, int rcode,
- u32 *payload, size_t length)
+ struct fw_card *card, int rcode)
{
struct fw_transaction *t;
unsigned long flags;
@@ -82,7 +81,7 @@ static int close_transaction(struct fw_t
spin_unlock_irqrestore(&card->lock, flags);
if (&t->link != &card->transaction_list) {
- t->callback(card, rcode, payload, length, t->callback_data);
+ t->callback(card, rcode, NULL, 0, t->callback_data);
return 0;
}
@@ -110,7 +109,7 @@ int fw_cancel_transaction(struct fw_card
* if the transaction is still pending and remove it in that case.
*/
- return close_transaction(transaction, card, RCODE_CANCELLED, NULL, 0);
+ return close_transaction(transaction, card, RCODE_CANCELLED);
}
EXPORT_SYMBOL(fw_cancel_transaction);
@@ -122,7 +121,7 @@ static void transmit_complete_callback(s
switch (status) {
case ACK_COMPLETE:
- close_transaction(t, card, RCODE_COMPLETE, NULL, 0);
+ close_transaction(t, card, RCODE_COMPLETE);
break;
case ACK_PENDING:
t->timestamp = packet->timestamp;
@@ -130,20 +129,20 @@ static void transmit_complete_callback(s
case ACK_BUSY_X:
case ACK_BUSY_A:
case ACK_BUSY_B:
- close_transaction(t, card, RCODE_BUSY, NULL, 0);
+ close_transaction(t, card, RCODE_BUSY);
break;
case ACK_DATA_ERROR:
- close_transaction(t, card, RCODE_DATA_ERROR, NULL, 0);
+ close_transaction(t, card, RCODE_DATA_ERROR);
break;
case ACK_TYPE_ERROR:
- close_transaction(t, card, RCODE_TYPE_ERROR, NULL, 0);
+ close_transaction(t, card, RCODE_TYPE_ERROR);
break;
default:
/*
* In this case the ack is really a juju specific
* rcode, so just forward that to the callback.
*/
- close_transaction(t, card, status, NULL, 0);
+ close_transaction(t, card, status);
break;
}
}
--
Stefan Richter
-=====-==--= --== -=-=-
http://arcgraph.de/sr/
Per IEEE 1394 clause 8.4.2.5, bus manager capable nodes which are not
incumbent shall wait at least 125ms before trying to establish
themselves as bus manager.
Signed-off-by: Stefan Richter <[email protected]>
---
drivers/firewire/fw-card.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
Index: linux/drivers/firewire/fw-card.c
===================================================================
--- linux.orig/drivers/firewire/fw-card.c
+++ linux/drivers/firewire/fw-card.c
@@ -368,9 +368,11 @@ static void fw_card_bm_work(struct work_
atomic_read(&root_device->state) == FW_DEVICE_RUNNING;
root_device_is_cmc = root_device && root_device->cmc;
root_id = root_node->node_id;
- grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 10));
irm_device = irm_node->data;
local_device = local_node->data;
+
+ grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 8));
+
if (is_next_generation(generation, card->bm_generation) ||
(card->bm_generation != generation && grace)) {
/*
@@ -434,12 +436,11 @@ static void fw_card_bm_work(struct work_
}
} else if (card->bm_generation != generation) {
/*
- * OK, we weren't BM in the last generation, and it's
- * less than 100ms since last bus reset. Reschedule
- * this task 100ms from now.
+ * We weren't BM in the last generation, and the last
+ * bus reset is less than 125ms ago. Reschedule this job.
*/
spin_unlock_irqrestore(&card->lock, flags);
- fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 10));
+ fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8));
goto out;
}
--
Stefan Richter
-=====-==--= --== -=-=-
http://arcgraph.de/sr/
fw-iso.c has channel allocation code now, use it.
Signed-off-by: Stefan Richter <[email protected]>
---
drivers/firewire/fw-card.c | 124 +++++++++----------------------------
1 file changed, 33 insertions(+), 91 deletions(-)
Index: linux/drivers/firewire/fw-card.c
===================================================================
--- linux.orig/drivers/firewire/fw-card.c
+++ linux/drivers/firewire/fw-card.c
@@ -181,10 +181,6 @@ void fw_core_remove_descriptor(struct fw
mutex_unlock(&card_mutex);
}
-/* ------------------------------------------------------------------ */
-/* Code to handle 1394a broadcast channel */
-
-#define THIRTY_TWO_CHANNELS (0xFFFFFFFFU)
#define IRM_RETRIES 2
/*
@@ -265,62 +261,18 @@ tryagain_w:
return 0;
}
-static void
-irm_allocate_broadcast(struct fw_device *irm_dev, struct device *locald)
+static void allocate_broadcast_channel(struct fw_card *card, int generation)
{
- u32 generation;
- u32 node_id;
- u32 max_speed;
- u32 retries;
- __be32 old_data;
- __be32 lock_data[2];
- int rcode;
+ int channel, bandwidth = 0;
- /*
- * The device we are updating is the IRM, so we must do
- * some extra work.
- */
- retries = IRM_RETRIES;
- generation = irm_dev->generation;
- /* FIXME: do we need locking here? */
- smp_rmb();
- node_id = irm_dev->node_id;
- max_speed = irm_dev->max_speed;
-
- lock_data[0] = cpu_to_be32(THIRTY_TWO_CHANNELS);
- lock_data[1] = cpu_to_be32(THIRTY_TWO_CHANNELS & ~1);
-tryagain:
- old_data = lock_data[0];
- rcode = fw_run_transaction(irm_dev->card, TCODE_LOCK_COMPARE_SWAP,
- node_id, generation, max_speed,
- CSR_REGISTER_BASE+CSR_CHANNELS_AVAILABLE_HI,
- &lock_data[0], 8);
- switch (rcode) {
- case RCODE_BUSY:
- if (retries--)
- goto tryagain;
- /* fallthrough */
- default:
- fw_error("node %x: allocate broadcast channel failed (%x)\n",
- node_id, rcode);
- return;
-
- case RCODE_COMPLETE:
- if (lock_data[0] == old_data)
- break;
- if (retries--) {
- lock_data[1] = cpu_to_be32(be32_to_cpu(lock_data[0])&~1);
- goto tryagain;
- }
- fw_error("node %x: allocate broadcast channel failed: too many"
- " retries\n", node_id);
- return;
+ fw_iso_resource_manage(card, generation, 1ULL << 31,
+ &channel, &bandwidth, true);
+ if (channel == 31) {
+ card->is_irm = true;
+ device_for_each_child(card->device, NULL,
+ fw_irm_set_broadcast_channel_register);
}
- irm_dev->card->is_irm = true;
- device_for_each_child(locald, NULL, fw_irm_set_broadcast_channel_register);
}
-/* ------------------------------------------------------------------ */
-
static const char gap_count_table[] = {
63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40
@@ -339,10 +291,11 @@ void fw_schedule_bm_work(struct fw_card
static void fw_card_bm_work(struct work_struct *work)
{
struct fw_card *card = container_of(work, struct fw_card, work.work);
- struct fw_device *root_device, *irm_device, *local_device;
- struct fw_node *root_node, *local_node, *irm_node;
+ struct fw_device *root_device;
+ struct fw_node *root_node;
unsigned long flags;
- int root_id, new_root_id, irm_id, gap_count, generation, grace, rcode;
+ int root_id, new_root_id, irm_id, local_id;
+ int gap_count, generation, grace, rcode;
bool do_reset = false;
bool root_device_is_running;
bool root_device_is_cmc;
@@ -350,26 +303,22 @@ static void fw_card_bm_work(struct work_
spin_lock_irqsave(&card->lock, flags);
card->is_irm = false;
- local_node = card->local_node;
- root_node = card->root_node;
- irm_node = card->irm_node;
- if (local_node == NULL) {
+ if (card->local_node == NULL) {
spin_unlock_irqrestore(&card->lock, flags);
goto out_put_card;
}
- fw_node_get(local_node);
- fw_node_get(root_node);
- fw_node_get(irm_node);
generation = card->generation;
+ root_node = card->root_node;
+ fw_node_get(root_node);
root_device = root_node->data;
root_device_is_running = root_device &&
atomic_read(&root_device->state) == FW_DEVICE_RUNNING;
root_device_is_cmc = root_device && root_device->cmc;
- root_id = root_node->node_id;
- irm_device = irm_node->data;
- local_device = local_node->data;
+ root_id = root_node->node_id;
+ irm_id = card->irm_node->node_id;
+ local_id = card->local_node->node_id;
grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 8));
@@ -387,16 +336,15 @@ static void fw_card_bm_work(struct work_
* next generation.
*/
- irm_id = irm_node->node_id;
- if (!irm_node->link_on) {
- new_root_id = local_node->node_id;
+ if (!card->irm_node->link_on) {
+ new_root_id = local_id;
fw_notify("IRM has link off, making local node (%02x) root.\n",
new_root_id);
goto pick_me;
}
lock_data[0] = cpu_to_be32(0x3f);
- lock_data[1] = cpu_to_be32(local_node->node_id);
+ lock_data[1] = cpu_to_be32(local_id);
spin_unlock_irqrestore(&card->lock, flags);
@@ -411,12 +359,11 @@ static void fw_card_bm_work(struct work_
if (rcode == RCODE_COMPLETE &&
lock_data[0] != cpu_to_be32(0x3f)) {
- /* Somebody else is BM, let them do the work. */
- if (irm_id == local_node->node_id) {
- /* But we are IRM, so do irm-y things */
- irm_allocate_broadcast(irm_device,
- card->device);
- }
+
+ /* Somebody else is BM. Only act as IRM. */
+ if (local_id == irm_id)
+ allocate_broadcast_channel(card, generation);
+
goto out;
}
@@ -429,7 +376,7 @@ static void fw_card_bm_work(struct work_
* do a bus reset and pick the local node as
* root, and thus, IRM.
*/
- new_root_id = local_node->node_id;
+ new_root_id = local_id;
fw_notify("BM lock failed, making local node (%02x) root.\n",
new_root_id);
goto pick_me;
@@ -456,7 +403,7 @@ static void fw_card_bm_work(struct work_
* Either link_on is false, or we failed to read the
* config rom. In either case, pick another root.
*/
- new_root_id = local_node->node_id;
+ new_root_id = local_id;
} else if (!root_device_is_running) {
/*
* If we haven't probed this device yet, bail out now
@@ -478,7 +425,7 @@ static void fw_card_bm_work(struct work_
* successfully read the config rom, but it's not
* cycle master capable.
*/
- new_root_id = local_node->node_id;
+ new_root_id = local_id;
}
pick_me:
@@ -509,19 +456,14 @@ static void fw_card_bm_work(struct work_
card->index, new_root_id, gap_count);
fw_send_phy_config(card, new_root_id, generation, gap_count);
fw_core_initiate_bus_reset(card, 1);
- } else if (irm_node->node_id == local_node->node_id) {
- /*
- * We are IRM, so do irm-y things.
- * There's no reason to do this if we're doing a reset. . .
- * We'll be back.
- */
- irm_allocate_broadcast(irm_device, card->device);
+ /* Will allocate broadcast channel after the reset. */
+ } else {
+ if (local_id == irm_id)
+ allocate_broadcast_channel(card, generation);
}
out:
fw_node_put(root_node);
- fw_node_put(local_node);
- fw_node_put(irm_node);
out_put_card:
fw_card_put(card);
}
--
Stefan Richter
-=====-==--= --== -=-=-
http://arcgraph.de/sr/
Cache the test result of whether a device implements BROADCAST_CHANNEL.
This minimizes traffic on the bus after each bus reset. A majority of
devices does not implement BROADCAST_CHANNEL.
Remove busy retries; just rely on the hardware to retry requests to busy
responders. Remove unnecessary log messages.
Rename the flag is_irm to broadcast_channel_allocated to better reflect
its meaning. Reset the flag earlier in fw_core_handle_bus_reset.
Pass the generation down as a call parameter; that way generation can't
be newer than card->broadcast_channel_allocated and device->node_id.
Signed-off-by: Stefan Richter <[email protected]>
---
drivers/firewire/fw-card.c | 85 +-----------------------------
drivers/firewire/fw-device.c | 45 ++++++++++++++-
drivers/firewire/fw-device.h | 5 +
drivers/firewire/fw-topology.c | 1
drivers/firewire/fw-transaction.h | 6 --
5 files changed, 52 insertions(+), 90 deletions(-)
Index: linux/drivers/firewire/fw-card.c
===================================================================
--- linux.orig/drivers/firewire/fw-card.c
+++ linux/drivers/firewire/fw-card.c
@@ -181,83 +181,9 @@ void fw_core_remove_descriptor(struct fw
mutex_unlock(&card_mutex);
}
-#define IRM_RETRIES 2
-
-/*
- * The abi is set by device_for_each_child(), even though we have no use
- * for data, nor do we have a meaningful return value.
- */
-int fw_irm_set_broadcast_channel_register(struct device *dev, void *data)
+static int set_broadcast_channel(struct device *dev, void *data)
{
- struct fw_device *d;
- int rcode;
- int node_id;
- int max_speed;
- int retries;
- int generation;
- __be32 regval;
- struct fw_card *card;
-
- d = fw_device(dev);
- /* FIXME: do we need locking here? */
- generation = d->generation;
- smp_rmb(); /* Ensure generation is at least as old as node_id */
- node_id = d->node_id;
- max_speed = d->max_speed;
- retries = IRM_RETRIES;
- card = d->card;
-tryagain_r:
- rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST,
- node_id, generation, max_speed,
- CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
- ®val, 4);
- switch (rcode) {
- case RCODE_BUSY:
- if (retries--)
- goto tryagain_r;
- fw_notify("node %x read broadcast channel busy\n",
- node_id);
- return 0;
-
- default:
- fw_notify("node %x read broadcast channel failed %x\n",
- node_id, rcode);
- return 0;
-
- case RCODE_COMPLETE:
- /*
- * Paranoid reporting of nonstandard broadcast channel
- * contents goes here
- */
- if (regval != cpu_to_be32(BROADCAST_CHANNEL_INITIAL))
- return 0;
- break;
- }
- retries = IRM_RETRIES;
- regval = cpu_to_be32(BROADCAST_CHANNEL_INITIAL |
- BROADCAST_CHANNEL_VALID);
-tryagain_w:
- rcode = fw_run_transaction(card,
- TCODE_WRITE_QUADLET_REQUEST, node_id,
- generation, max_speed,
- CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
- ®val, 4);
- switch (rcode) {
- case RCODE_BUSY:
- if (retries--)
- goto tryagain_w;
- fw_notify("node %x write broadcast channel busy\n",
- node_id);
- return 0;
-
- default:
- fw_notify("node %x write broadcast channel failed %x\n",
- node_id, rcode);
- return 0;
-
- case RCODE_COMPLETE:
- return 0;
- }
+ fw_device_set_broadcast_channel(fw_device(dev), (long)data);
return 0;
}
@@ -268,9 +194,9 @@ static void allocate_broadcast_channel(s
fw_iso_resource_manage(card, generation, 1ULL << 31,
&channel, &bandwidth, true);
if (channel == 31) {
- card->is_irm = true;
- device_for_each_child(card->device, NULL,
- fw_irm_set_broadcast_channel_register);
+ card->broadcast_channel_allocated = true;
+ device_for_each_child(card->device, (void *)(long)generation,
+ set_broadcast_channel);
}
}
@@ -302,7 +228,6 @@ static void fw_card_bm_work(struct work_
__be32 lock_data[2];
spin_lock_irqsave(&card->lock, flags);
- card->is_irm = false;
if (card->local_node == NULL) {
spin_unlock_irqrestore(&card->lock, flags);
Index: linux/drivers/firewire/fw-device.c
===================================================================
--- linux.orig/drivers/firewire/fw-device.c
+++ linux/drivers/firewire/fw-device.c
@@ -518,7 +518,7 @@ static int read_bus_info_block(struct fw
kfree(old_rom);
ret = 0;
- device->cmc = rom[2] & 1 << 30;
+ device->cmc = rom[2] >> 30 & 1;
out:
kfree(rom);
@@ -756,6 +756,44 @@ static int lookup_existing_device(struct
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 =
@@ -849,9 +887,8 @@ static void fw_device_init(struct work_s
device->config_rom[3], device->config_rom[4],
1 << device->max_speed);
device->config_rom_retries = 0;
- if (device->card->is_irm)
- fw_irm_set_broadcast_channel_register(&device->device,
- NULL);
+
+ fw_device_set_broadcast_channel(device, device->generation);
}
/*
Index: linux/drivers/firewire/fw-device.h
===================================================================
--- linux.orig/drivers/firewire/fw-device.h
+++ linux/drivers/firewire/fw-device.h
@@ -71,7 +71,6 @@ struct fw_device {
int node_id;
int generation;
unsigned max_speed;
- bool cmc;
struct fw_card *card;
struct device device;
@@ -81,6 +80,9 @@ struct fw_device {
u32 *config_rom;
size_t config_rom_length;
int config_rom_retries;
+ unsigned cmc:1;
+ unsigned bc_implemented:2;
+
struct delayed_work work;
struct fw_attribute_group attribute_group;
};
@@ -109,6 +111,7 @@ static inline void fw_device_put(struct
struct fw_device *fw_device_get_by_devt(dev_t devt);
int fw_device_enable_phys_dma(struct fw_device *device);
+void fw_device_set_broadcast_channel(struct fw_device *device, int generation);
void fw_device_cdev_update(struct fw_device *device);
void fw_device_cdev_remove(struct fw_device *device);
Index: linux/drivers/firewire/fw-topology.c
===================================================================
--- linux.orig/drivers/firewire/fw-topology.c
+++ linux/drivers/firewire/fw-topology.c
@@ -526,6 +526,7 @@ void fw_core_handle_bus_reset(struct fw_
spin_lock_irqsave(&card->lock, flags);
+ card->broadcast_channel_allocated = false;
card->node_id = node_id;
/*
* Update node_id before generation to prevent anybody from using
Index: linux/drivers/firewire/fw-transaction.h
===================================================================
--- linux.orig/drivers/firewire/fw-transaction.h
+++ linux/drivers/firewire/fw-transaction.h
@@ -230,11 +230,6 @@ struct fw_card {
u8 color; /* must be u8 to match the definition in struct fw_node */
int gap_count;
bool beta_repeaters_present;
- /*
- * Set if the local device is the IRM and the broadcast channel
- * was allocated.
- */
- bool is_irm;
int index;
@@ -245,6 +240,7 @@ struct fw_card {
int bm_retries;
int bm_generation;
+ bool broadcast_channel_allocated;
u32 broadcast_channel;
u32 topology_map[(CSR_TOPOLOGY_MAP_END - CSR_TOPOLOGY_MAP) / 4];
};
--
Stefan Richter
-=====-==--= --== -=-=-
http://arcgraph.de/sr/
There is no 5th patch. I can't count.
--
Stefan Richter
-=====-==--= --== -=-=-
http://arcgraph.de/sr/