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ALSA: firewire: extend snd_fw_transaction() 

Add a flag to snd_fw_transaction() to allow it to abort when a bus reset
happens.  This removes most of the duplicated error handling loops that
were required around calls to the low-level fw_run_transaction().

Also add a flag to suppress error messages; errors are expected when we
attempt to clean up after the device was unplugged.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch 2011-09-04 22:17:38 +02:00
parent a644a9473f
commit 1b70485f13
8 changed files with 133 additions and 202 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
sound/firewire/cmp.c
View File

@ -48,9 +48,6 @@ static int pcr_modify(struct cmp_connection *c,
int (*check)(struct cmp_connection *c, __be32 pcr),
enum bus_reset_handling bus_reset_handling)
{
struct fw_device *device = fw_parent_device(c->resources.unit);
int generation = c->resources.generation;
int rcode, errors = 0;
__be32 old_arg, buffer[2];
int err;
@ -59,36 +56,31 @@ static int pcr_modify(struct cmp_connection *c,
old_arg = buffer[0];
buffer[1] = modify(c, buffer[0]);
rcode = fw_run_transaction(
device->card, TCODE_LOCK_COMPARE_SWAP,
device->node_id, generation, device->max_speed,
err = snd_fw_transaction(
c->resources.unit, TCODE_LOCK_COMPARE_SWAP,
CSR_REGISTER_BASE + CSR_IPCR(c->pcr_index),
buffer, 8);
buffer, 8,
FW_FIXED_GENERATION | c->resources.generation);
if (rcode == RCODE_COMPLETE) {
if (buffer[0] == old_arg) /* success? */
break;
if (err < 0) {
if (err == -EAGAIN &&
bus_reset_handling == SUCCEED_ON_BUS_RESET)
err = 0;
return err;
}
if (check) {
err = check(c, buffer[0]);
if (err < 0)
return err;
}
} else if (rcode == RCODE_GENERATION)
goto bus_reset;
else if (rcode_is_permanent_error(rcode) || ++errors >= 3)
goto io_error;
if (buffer[0] == old_arg) /* success? */
break;
if (check) {
err = check(c, buffer[0]);
if (err < 0)
return err;
}
}
c->last_pcr_value = buffer[1];
return 0;
io_error:
cmp_error(c, "transaction failed: %s\n", fw_rcode_string(rcode));
return -EIO;
bus_reset:
return bus_reset_handling == ABORT_ON_BUS_RESET ? -EAGAIN : 0;
}
@ -108,7 +100,7 @@ int cmp_connection_init(struct cmp_connection *c,
err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST,
CSR_REGISTER_BASE + CSR_IMPR,
&impr_be, 4);
&impr_be, 4, 0);
if (err < 0)
return err;
impr = be32_to_cpu(impr_be);

203
sound/firewire/dice.c
View File

@ -118,7 +118,7 @@ static int dice_owner_set(struct dice *dice)
{
struct fw_device *device = fw_parent_device(dice->unit);
__be64 *buffer;
int rcode, err, errors = 0;
int err, errors = 0;
buffer = kmalloc(2 * 8, GFP_KERNEL);
if (!buffer)
@ -132,31 +132,24 @@ static int dice_owner_set(struct dice *dice)
dice->owner_generation = device->generation;
smp_rmb(); /* node_id vs. generation */
rcode = fw_run_transaction(device->card,
TCODE_LOCK_COMPARE_SWAP,
device->node_id,
dice->owner_generation,
device->max_speed,
global_address(dice, GLOBAL_OWNER),
buffer, 2 * 8);
err = snd_fw_transaction(dice->unit,
TCODE_LOCK_COMPARE_SWAP,
global_address(dice, GLOBAL_OWNER),
buffer, 2 * 8,
FW_FIXED_GENERATION |
dice->owner_generation);
if (rcode == RCODE_COMPLETE) {
if (buffer[0] == cpu_to_be64(OWNER_NO_OWNER)) {
err = 0;
} else {
if (err == 0) {
if (buffer[0] != cpu_to_be64(OWNER_NO_OWNER)) {
dev_err(&dice->unit->device,
"device is already in use\n");
err = -EBUSY;
}
break;
}
if (rcode_is_permanent_error(rcode) || ++errors >= 3) {
dev_err(&dice->unit->device,
"setting device owner failed: %s\n",
fw_rcode_string(rcode));
err = -EIO;
if (err != -EAGAIN || ++errors >= 3)
break;
}
msleep(20);
}
@ -169,7 +162,7 @@ static int dice_owner_update(struct dice *dice)
{
struct fw_device *device = fw_parent_device(dice->unit);
__be64 *buffer;
int rcode, err, errors = 0;
int err;
if (dice->owner_generation == -1)
return 0;
@ -178,44 +171,26 @@ static int dice_owner_update(struct dice *dice)
if (!buffer)
return -ENOMEM;
for (;;) {
buffer[0] = cpu_to_be64(OWNER_NO_OWNER);
buffer[1] = cpu_to_be64(
((u64)device->card->node_id << OWNER_NODE_SHIFT) |
dice->notification_handler.offset);
buffer[0] = cpu_to_be64(OWNER_NO_OWNER);
buffer[1] = cpu_to_be64(
((u64)device->card->node_id << OWNER_NODE_SHIFT) |
dice->notification_handler.offset);
dice->owner_generation = device->generation;
smp_rmb(); /* node_id vs. generation */
rcode = fw_run_transaction(device->card,
TCODE_LOCK_COMPARE_SWAP,
device->node_id,
dice->owner_generation,
device->max_speed,
global_address(dice, GLOBAL_OWNER),
buffer, 2 * 8);
dice->owner_generation = device->generation;
smp_rmb(); /* node_id vs. generation */
err = snd_fw_transaction(dice->unit, TCODE_LOCK_COMPARE_SWAP,
global_address(dice, GLOBAL_OWNER),
buffer, 2 * 8,
FW_FIXED_GENERATION | dice->owner_generation);
if (rcode == RCODE_COMPLETE) {
if (buffer[0] == cpu_to_be64(OWNER_NO_OWNER)) {
err = 0;
} else {
dev_err(&dice->unit->device,
"device is already in use\n");
err = -EBUSY;
}
break;
}
if (rcode == RCODE_GENERATION) {
err = 0; /* try again later */
break;
}
if (rcode_is_permanent_error(rcode) || ++errors >= 3) {
if (err == 0) {
if (buffer[0] != cpu_to_be64(OWNER_NO_OWNER)) {
dev_err(&dice->unit->device,
"setting device owner failed: %s\n",
fw_rcode_string(rcode));
err = -EIO;
break;
"device is already in use\n");
err = -EBUSY;
}
msleep(20);
} else if (err == -EAGAIN) {
err = 0; /* try again later */
}
kfree(buffer);
@ -230,38 +205,19 @@ static void dice_owner_clear(struct dice *dice)
{
struct fw_device *device = fw_parent_device(dice->unit);
__be64 *buffer;
int rcode, errors = 0;
buffer = kmalloc(2 * 8, GFP_KERNEL);
if (!buffer)
return;
for (;;) {
buffer[0] = cpu_to_be64(
((u64)device->card->node_id << OWNER_NODE_SHIFT) |
dice->notification_handler.offset);
buffer[1] = cpu_to_be64(OWNER_NO_OWNER);
rcode = fw_run_transaction(device->card,
TCODE_LOCK_COMPARE_SWAP,
device->node_id,
dice->owner_generation,
device->max_speed,
global_address(dice, GLOBAL_OWNER),
buffer, 2 * 8);
if (rcode == RCODE_COMPLETE)
break;
if (rcode == RCODE_GENERATION)
break;
if (rcode_is_permanent_error(rcode) || ++errors >= 3) {
dev_err(&dice->unit->device,
"clearing device owner failed: %s\n",
fw_rcode_string(rcode));
break;
}
msleep(20);
}
buffer[0] = cpu_to_be64(
((u64)device->card->node_id << OWNER_NODE_SHIFT) |
dice->notification_handler.offset);
buffer[1] = cpu_to_be64(OWNER_NO_OWNER);
snd_fw_transaction(dice->unit, TCODE_LOCK_COMPARE_SWAP,
global_address(dice, GLOBAL_OWNER),
buffer, 2 * 8, FW_QUIET |
FW_FIXED_GENERATION | dice->owner_generation);
kfree(buffer);
@ -270,67 +226,32 @@ static void dice_owner_clear(struct dice *dice)
static int dice_enable_set(struct dice *dice)
{
struct fw_device *device = fw_parent_device(dice->unit);
__be32 value;
int rcode, err, errors = 0;
int err;
value = cpu_to_be32(1);
for (;;) {
rcode = fw_run_transaction(device->card,
TCODE_WRITE_QUADLET_REQUEST,
device->node_id,
dice->owner_generation,
device->max_speed,
global_address(dice, GLOBAL_ENABLE),
&value, 4);
if (rcode == RCODE_COMPLETE) {
dice->global_enabled = true;
err = 0;
break;
}
if (rcode == RCODE_GENERATION) {
err = -EAGAIN;
break;
}
if (rcode_is_permanent_error(rcode) || ++errors >= 3) {
dev_err(&dice->unit->device,
"device enabling failed: %s\n",
fw_rcode_string(rcode));
err = -EIO;
break;
}
msleep(20);
}
err = snd_fw_transaction(dice->unit, TCODE_WRITE_QUADLET_REQUEST,
global_address(dice, GLOBAL_ENABLE),
&value, 4,
FW_FIXED_GENERATION | dice->owner_generation);
if (err < 0)
return err;
return err;
dice->global_enabled = true;
return 0;
}
static void dice_enable_clear(struct dice *dice)
{
struct fw_device *device = fw_parent_device(dice->unit);
__be32 value;
int rcode, errors = 0;
value = 0;
for (;;) {
rcode = fw_run_transaction(device->card,
TCODE_WRITE_QUADLET_REQUEST,
device->node_id,
dice->owner_generation,
device->max_speed,
global_address(dice, GLOBAL_ENABLE),
&value, 4);
if (rcode == RCODE_COMPLETE ||
rcode == RCODE_GENERATION)
break;
if (rcode_is_permanent_error(rcode) || ++errors >= 3) {
dev_err(&dice->unit->device,
"device disabling failed: %s\n",
fw_rcode_string(rcode));
break;
}
msleep(20);
}
snd_fw_transaction(dice->unit, TCODE_WRITE_QUADLET_REQUEST,
global_address(dice, GLOBAL_ENABLE),
&value, 4, FW_QUIET |
FW_FIXED_GENERATION | dice->owner_generation);
dice->global_enabled = false;
}
@ -384,7 +305,7 @@ static int dice_open(struct snd_pcm_substream *substream)
err = snd_fw_transaction(dice->unit, TCODE_READ_QUADLET_REQUEST,
global_address(dice, GLOBAL_CLOCK_SELECT),
&clock_sel, 4);
&clock_sel, 4, 0);
if (err < 0)
goto err_lock;
rate_index = (be32_to_cpu(clock_sel) & CLOCK_RATE_MASK)
@ -396,7 +317,7 @@ static int dice_open(struct snd_pcm_substream *substream)
err = snd_fw_transaction(dice->unit, TCODE_READ_BLOCK_REQUEST,
rx_address(dice, RX_NUMBER_AUDIO),
data, 2 * 4);
data, 2 * 4, 0);
if (err < 0)
goto err_lock;
number_audio = be32_to_cpu(data[0]);
@ -488,7 +409,7 @@ static int dice_stream_start(struct dice *dice)
err = snd_fw_transaction(dice->unit,
TCODE_WRITE_QUADLET_REQUEST,
rx_address(dice, RX_ISOCHRONOUS),
&channel, 4);
&channel, 4, 0);
if (err < 0)
goto err_resources;
}
@ -502,7 +423,7 @@ static int dice_stream_start(struct dice *dice)
err_rx_channel:
channel = cpu_to_be32((u32)-1);
snd_fw_transaction(dice->unit, TCODE_WRITE_QUADLET_REQUEST,
rx_address(dice, RX_ISOCHRONOUS), &channel, 4);
rx_address(dice, RX_ISOCHRONOUS), &channel, 4, 0);
err_resources:
fw_iso_resources_free(&dice->resources);
error:
@ -528,7 +449,7 @@ static void dice_stream_stop(struct dice *dice)
channel = cpu_to_be32((u32)-1);
snd_fw_transaction(dice->unit, TCODE_WRITE_QUADLET_REQUEST,
rx_address(dice, RX_ISOCHRONOUS), &channel, 4);
rx_address(dice, RX_ISOCHRONOUS), &channel, 4, 0);
fw_iso_resources_free(&dice->resources);
}
@ -880,7 +801,7 @@ static int dice_interface_check(struct fw_unit *unit)
*/
err = snd_fw_transaction(unit, TCODE_READ_BLOCK_REQUEST,
DICE_PRIVATE_SPACE,
pointers, sizeof(pointers));
pointers, sizeof(pointers), 0);
if (err < 0)
return -ENODEV;
for (i = 0; i < ARRAY_SIZE(pointers); ++i) {
@ -896,7 +817,7 @@ static int dice_interface_check(struct fw_unit *unit)
err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST,
DICE_PRIVATE_SPACE +
be32_to_cpu(pointers[0]) * 4 + GLOBAL_VERSION,
&version, 4);
&version, 4, 0);
if (err < 0)
return -ENODEV;
if ((version & cpu_to_be32(0xff000000)) != cpu_to_be32(0x01000000)) {
@ -915,7 +836,7 @@ static int dice_init_offsets(struct dice *dice)
err = snd_fw_transaction(dice->unit, TCODE_READ_BLOCK_REQUEST,
DICE_PRIVATE_SPACE,
pointers, sizeof(pointers));
pointers, sizeof(pointers), 0);
if (err < 0)
return err;
@ -939,7 +860,7 @@ static void dice_card_strings(struct dice *dice)
BUILD_BUG_ON(NICK_NAME_SIZE < sizeof(card->shortname));
err = snd_fw_transaction(dice->unit, TCODE_READ_BLOCK_REQUEST,
global_address(dice, GLOBAL_NICK_NAME),
card->shortname, sizeof(card->shortname));
card->shortname, sizeof(card->shortname), 0);
if (err >= 0) {
/* DICE strings are returned in "always-wrong" endianness */
BUILD_BUG_ON(sizeof(card->shortname) % 4 != 0);
@ -1015,14 +936,14 @@ static int dice_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST,
global_address(dice, GLOBAL_CLOCK_SELECT),
&clock_sel, 4);
&clock_sel, 4, 0);
if (err < 0)
goto error;
clock_sel &= cpu_to_be32(~CLOCK_SOURCE_MASK);
clock_sel |= cpu_to_be32(CLOCK_SOURCE_ARX1);
err = snd_fw_transaction(unit, TCODE_WRITE_QUADLET_REQUEST,
global_address(dice, GLOBAL_CLOCK_SELECT),
&clock_sel, 4);
&clock_sel, 4, 0);
if (err < 0)
goto error;

2
sound/firewire/fcp.c
View File

@ -90,7 +90,7 @@ int fcp_avc_transaction(struct fw_unit *unit,
: TCODE_WRITE_BLOCK_REQUEST;
ret = snd_fw_transaction(t.unit, tcode,
CSR_REGISTER_BASE + CSR_FCP_COMMAND,
(void *)command, command_size);
(void *)command, command_size, 0);
if (ret < 0)
break;

43
sound/firewire/isight.c
View File

@ -217,7 +217,7 @@ static void isight_packet(struct fw_iso_context *context, u32 cycle,
static int isight_connect(struct isight *isight)
{
int ch, err, rcode, errors = 0;
int ch, err;
__be32 value;
retry_after_bus_reset:
@ -230,27 +230,19 @@ retry_after_bus_reset:
}
value = cpu_to_be32(ch | (isight->device->max_speed << SPEED_SHIFT));
for (;;) {
rcode = fw_run_transaction(
isight->device->card,
TCODE_WRITE_QUADLET_REQUEST,
isight->device->node_id,
isight->resources.generation,
isight->device->max_speed,
isight->audio_base + REG_ISO_TX_CONFIG,
&value, 4);
if (rcode == RCODE_COMPLETE) {
return 0;
} else if (rcode == RCODE_GENERATION) {
fw_iso_resources_free(&isight->resources);
goto retry_after_bus_reset;
} else if (rcode_is_permanent_error(rcode) || ++errors >= 3) {
err = -EIO;
goto err_resources;
}
msleep(5);
err = snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
isight->audio_base + REG_ISO_TX_CONFIG,
&value, 4, FW_FIXED_GENERATION |
isight->resources.generation);
if (err == -EAGAIN) {
fw_iso_resources_free(&isight->resources);
goto retry_after_bus_reset;
} else if (err < 0) {
goto err_resources;
}
return 0;
err_resources:
fw_iso_resources_free(&isight->resources);
error:
@ -315,17 +307,19 @@ static int isight_hw_params(struct snd_pcm_substream *substream,
static int reg_read(struct isight *isight, int offset, __be32 *value)
{
return snd_fw_transaction(isight->unit, TCODE_READ_QUADLET_REQUEST,
isight->audio_base + offset, value, 4);
isight->audio_base + offset, value, 4, 0);
}
static int reg_write(struct isight *isight, int offset, __be32 value)
{
return snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
isight->audio_base + offset, &value, 4);
isight->audio_base + offset, &value, 4, 0);
}
static void isight_stop_streaming(struct isight *isight)
{
__be32 value;
if (!isight->context)
return;
@ -333,7 +327,10 @@ static void isight_stop_streaming(struct isight *isight)
fw_iso_context_destroy(isight->context);
isight->context = NULL;
fw_iso_resources_free(&isight->resources);
reg_write(isight, REG_AUDIO_ENABLE, 0);
value = 0;
snd_fw_transaction(isight->unit, TCODE_WRITE_QUADLET_REQUEST,
isight->audio_base + REG_AUDIO_ENABLE,
&value, 4, FW_QUIET);
}
static int isight_hw_free(struct snd_pcm_substream *substream)

24
sound/firewire/lib.c
View File

@ -11,7 +11,7 @@
#include <linux/module.h>
#include "lib.h"
#define ERROR_RETRY_DELAY_MS 5
#define ERROR_RETRY_DELAY_MS 20
/**
* snd_fw_transaction - send a request and wait for its completion
@ -20,6 +20,9 @@
* @offset: the address in the target's address space
* @buffer: input/output data
* @length: length of @buffer
* @flags: use %FW_FIXED_GENERATION and add the generation value to attempt the
* request only in that generation; use %FW_QUIET to suppress error
* messages
*
* Submits an asynchronous request to the target device, and waits for the
* response. The node ID and the current generation are derived from @unit.
@ -27,14 +30,18 @@
* Returns zero on success, or a negative error code.
*/
int snd_fw_transaction(struct fw_unit *unit, int tcode,
u64 offset, void *buffer, size_t length)
u64 offset, void *buffer, size_t length,
unsigned int flags)
{
struct fw_device *device = fw_parent_device(unit);
int generation, rcode, tries = 0;
generation = flags & FW_GENERATION_MASK;
for (;;) {
generation = device->generation;
smp_rmb(); /* node_id vs. generation */
if (!(flags & FW_FIXED_GENERATION)) {
generation = device->generation;
smp_rmb(); /* node_id vs. generation */
}
rcode = fw_run_transaction(device->card, tcode,
device->node_id, generation,
device->max_speed, offset,
@ -43,9 +50,14 @@ int snd_fw_transaction(struct fw_unit *unit, int tcode,
if (rcode == RCODE_COMPLETE)
return 0;
if (rcode == RCODE_GENERATION && (flags & FW_FIXED_GENERATION))
return -EAGAIN;
if (rcode_is_permanent_error(rcode) || ++tries >= 3) {
dev_err(&unit->device, "transaction failed: %s\n",
fw_rcode_string(rcode));
if (!(flags & FW_QUIET))
dev_err(&unit->device,
"transaction failed: %s\n",
fw_rcode_string(rcode));
return -EIO;
}

7
sound/firewire/lib.h
View File

@ -6,8 +6,13 @@
struct fw_unit;
#define FW_GENERATION_MASK 0x00ff
#define FW_FIXED_GENERATION 0x0100
#define FW_QUIET 0x0200
int snd_fw_transaction(struct fw_unit *unit, int tcode,
u64 offset, void *buffer, size_t length);
u64 offset, void *buffer, size_t length,
unsigned int flags);
/* returns true if retrying the transaction would not make sense */
static inline bool rcode_is_permanent_error(int rcode)

8
sound/firewire/scs1x.c
View File

@ -369,7 +369,7 @@ static int scs_init_hss_address(struct scs *scs)
data = cpu_to_be64(((u64)HSS1394_TAG_CHANGE_ADDRESS << 56) |
scs->hss_handler.offset);
err = snd_fw_transaction(scs->unit, TCODE_WRITE_BLOCK_REQUEST,
HSS1394_ADDRESS, &data, 8);
HSS1394_ADDRESS, &data, 8, 0);
if (err < 0)
dev_err(&scs->unit->device, "HSS1394 communication failed\n");
@ -455,12 +455,16 @@ err_card:
static void scs_update(struct fw_unit *unit)
{
struct scs *scs = dev_get_drvdata(&unit->device);
int generation;
__be64 data;
data = cpu_to_be64(((u64)HSS1394_TAG_CHANGE_ADDRESS << 56) |
scs->hss_handler.offset);
generation = fw_parent_device(unit)->generation;
smp_rmb(); /* node_id vs. generation */
snd_fw_transaction(scs->unit, TCODE_WRITE_BLOCK_REQUEST,
HSS1394_ADDRESS, &data, 8);
HSS1394_ADDRESS, &data, 8,
FW_FIXED_GENERATION | generation);
}
static void scs_remove(struct fw_unit *unit)

2
sound/firewire/speakers.c
View File

@ -647,7 +647,7 @@ static u32 fwspk_read_firmware_version(struct fw_unit *unit)
int err;
err = snd_fw_transaction(unit, TCODE_READ_QUADLET_REQUEST,
OXFORD_FIRMWARE_ID_ADDRESS, &data, 4);
OXFORD_FIRMWARE_ID_ADDRESS, &data, 4, 0);
return err >= 0 ? be32_to_cpu(data) : 0;
}