From 9fb551bf72929b316abb6d96cfb2ec05e896042a Mon Sep 17 00:00:00 2001 From: Stefan Richter Date: Thu, 8 Oct 2009 00:41:10 +0200 Subject: firewire: normalize style of queue_work wrappers A few stylistic changes to unify some code patterns in the subsystem: - The similar queue_delayed_work helpers fw_schedule_bm_work, schedule_iso_resource, and sbp2_queue_work now have the same call convention. - Two conditional calls of schedule_iso_resource are factored into another small helper. - An sbp2_target_get helper is added as counterpart to sbp2_target_put. Object size of firewire-core is decreased a little bit, object size of firewire-sbp2 remains unchanged. Signed-off-by: Stefan Richter --- drivers/firewire/core-card.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) (limited to 'drivers/firewire/core-card.c') diff --git a/drivers/firewire/core-card.c b/drivers/firewire/core-card.c index e4864e894e4f..33898b63cdf7 100644 --- a/drivers/firewire/core-card.c +++ b/drivers/firewire/core-card.c @@ -211,11 +211,8 @@ static const char gap_count_table[] = { void fw_schedule_bm_work(struct fw_card *card, unsigned long delay) { - int scheduled; - fw_card_get(card); - scheduled = schedule_delayed_work(&card->work, delay); - if (!scheduled) + if (!schedule_delayed_work(&card->work, delay)) fw_card_put(card); } -- cgit v1.2.3 From 8e85973efc87dfae8508f1a3440fd44612897458 Mon Sep 17 00:00:00 2001 From: Stefan Richter Date: Thu, 8 Oct 2009 00:41:59 +0200 Subject: firewire: optimize config ROM creation The config ROM image of the local node was created in CPU byte order, then a temporary big endian copy was created to compute the CRC, and finally the card driver created its own big endian copy. We now generate it in big endian byte order in the first place to avoid one byte order conversion and the temporary on-stack copy of the ROM image (1000 bytes stack usage in process context). Furthermore, two 1000 bytes memset()s are replaced by one 1000 bytes - ROM length sized memset. The trivial fw_memcpy_{from,to}_be32() helpers are now superfluous and removed. The newly added __compute_block_crc() function will be folded into fw_compute_block_crc() in a subsequent change. Signed-off-by: Stefan Richter --- drivers/firewire/core-card.c | 62 ++++++++++++++++++++++++++------------------ 1 file changed, 37 insertions(+), 25 deletions(-) (limited to 'drivers/firewire/core-card.c') diff --git a/drivers/firewire/core-card.c b/drivers/firewire/core-card.c index 33898b63cdf7..f73e3bdfc84c 100644 --- a/drivers/firewire/core-card.c +++ b/drivers/firewire/core-card.c @@ -38,6 +38,18 @@ #include "core.h" +static int __compute_block_crc(__be32 *block) +{ + int length; + u16 crc; + + length = (be32_to_cpu(block[0]) >> 16) & 0xff; + crc = crc_itu_t(0, (u8 *)&block[1], length * 4); + *block |= cpu_to_be32(crc); + + return length; +} + int fw_compute_block_crc(u32 *block) { __be32 be32_block[256]; @@ -72,11 +84,11 @@ static int descriptor_count; #define BIB_CMC ((1) << 30) #define BIB_IMC ((1) << 31) -static u32 *generate_config_rom(struct fw_card *card, size_t *config_rom_length) +static __be32 *generate_config_rom(struct fw_card *card, size_t *rom_length) { struct fw_descriptor *desc; - static u32 config_rom[256]; - int i, j, length; + static __be32 config_rom[256]; + int i, j, k, length; /* * Initialize contents of config rom buffer. On the OHCI @@ -87,40 +99,39 @@ static u32 *generate_config_rom(struct fw_card *card, size_t *config_rom_length) * the version stored in the OHCI registers. */ - memset(config_rom, 0, sizeof(config_rom)); - config_rom[0] = BIB_CRC_LENGTH(4) | BIB_INFO_LENGTH(4) | BIB_CRC(0); - config_rom[1] = 0x31333934; - - config_rom[2] = + config_rom[0] = cpu_to_be32( + BIB_CRC_LENGTH(4) | BIB_INFO_LENGTH(4) | BIB_CRC(0)); + config_rom[1] = cpu_to_be32(0x31333934); + config_rom[2] = cpu_to_be32( BIB_LINK_SPEED(card->link_speed) | BIB_GENERATION(card->config_rom_generation++ % 14 + 2) | BIB_MAX_ROM(2) | BIB_MAX_RECEIVE(card->max_receive) | - BIB_BMC | BIB_ISC | BIB_CMC | BIB_IMC; - config_rom[3] = card->guid >> 32; - config_rom[4] = card->guid; + BIB_BMC | BIB_ISC | BIB_CMC | BIB_IMC); + config_rom[3] = cpu_to_be32(card->guid >> 32); + config_rom[4] = cpu_to_be32(card->guid); /* Generate root directory. */ - i = 5; - config_rom[i++] = 0; - config_rom[i++] = 0x0c0083c0; /* node capabilities */ - j = i + descriptor_count; + config_rom[6] = cpu_to_be32(0x0c0083c0); /* node capabilities */ + i = 7; + j = 7 + descriptor_count; /* Generate root directory entries for descriptors. */ list_for_each_entry (desc, &descriptor_list, link) { if (desc->immediate > 0) - config_rom[i++] = desc->immediate; - config_rom[i] = desc->key | (j - i); + config_rom[i++] = cpu_to_be32(desc->immediate); + config_rom[i] = cpu_to_be32(desc->key | (j - i)); i++; j += desc->length; } /* Update root directory length. */ - config_rom[5] = (i - 5 - 1) << 16; + config_rom[5] = cpu_to_be32((i - 5 - 1) << 16); /* End of root directory, now copy in descriptors. */ list_for_each_entry (desc, &descriptor_list, link) { - memcpy(&config_rom[i], desc->data, desc->length * 4); + for (k = 0; k < desc->length; k++) + config_rom[i + k] = cpu_to_be32(desc->data[k]); i += desc->length; } @@ -129,9 +140,9 @@ static u32 *generate_config_rom(struct fw_card *card, size_t *config_rom_length) * the bus info block, which is always the case for this * implementation. */ for (i = 0; i < j; i += length + 1) - length = fw_compute_block_crc(config_rom + i); + length = __compute_block_crc(config_rom + i); - *config_rom_length = j; + *rom_length = j; return config_rom; } @@ -139,7 +150,7 @@ static u32 *generate_config_rom(struct fw_card *card, size_t *config_rom_length) static void update_config_roms(void) { struct fw_card *card; - u32 *config_rom; + __be32 *config_rom; size_t length; list_for_each_entry (card, &card_list, link) { @@ -432,7 +443,7 @@ EXPORT_SYMBOL(fw_card_initialize); int fw_card_add(struct fw_card *card, u32 max_receive, u32 link_speed, u64 guid) { - u32 *config_rom; + __be32 *config_rom; size_t length; int ret; @@ -462,7 +473,8 @@ EXPORT_SYMBOL(fw_card_add); * shutdown still need to be provided by the card driver. */ -static int dummy_enable(struct fw_card *card, u32 *config_rom, size_t length) +static int dummy_enable(struct fw_card *card, + const __be32 *config_rom, size_t length) { BUG(); return -1; @@ -475,7 +487,7 @@ static int dummy_update_phy_reg(struct fw_card *card, int address, } static int dummy_set_config_rom(struct fw_card *card, - u32 *config_rom, size_t length) + const __be32 *config_rom, size_t length) { /* * We take the card out of card_list before setting the dummy -- cgit v1.2.3 From fe242579e9f33150868f1bb79c7e262ad7953f17 Mon Sep 17 00:00:00 2001 From: Stefan Richter Date: Thu, 8 Oct 2009 00:42:27 +0200 Subject: firewire: core: clarify generate_config_rom usage Move the static config ROM buffer into the scope of the two callers of generate_config_rom(). That way the ROM length can be passed over as return value rather than through a pointer argument. It also becomes more obvious that accesses to the config ROM buffer have to be serialized and how this is accomplished. And firewire-core.ko shrinks a bit as well. Signed-off-by: Stefan Richter --- drivers/firewire/core-card.c | 19 ++++++++----------- 1 file changed, 8 insertions(+), 11 deletions(-) (limited to 'drivers/firewire/core-card.c') diff --git a/drivers/firewire/core-card.c b/drivers/firewire/core-card.c index f73e3bdfc84c..f58130789990 100644 --- a/drivers/firewire/core-card.c +++ b/drivers/firewire/core-card.c @@ -69,6 +69,8 @@ static LIST_HEAD(card_list); static LIST_HEAD(descriptor_list); static int descriptor_count; +static __be32 tmp_config_rom[256]; + #define BIB_CRC(v) ((v) << 0) #define BIB_CRC_LENGTH(v) ((v) << 16) #define BIB_INFO_LENGTH(v) ((v) << 24) @@ -84,10 +86,9 @@ static int descriptor_count; #define BIB_CMC ((1) << 30) #define BIB_IMC ((1) << 31) -static __be32 *generate_config_rom(struct fw_card *card, size_t *rom_length) +static size_t generate_config_rom(struct fw_card *card, __be32 *config_rom) { struct fw_descriptor *desc; - static __be32 config_rom[256]; int i, j, k, length; /* @@ -142,20 +143,17 @@ static __be32 *generate_config_rom(struct fw_card *card, size_t *rom_length) for (i = 0; i < j; i += length + 1) length = __compute_block_crc(config_rom + i); - *rom_length = j; - - return config_rom; + return j; } static void update_config_roms(void) { struct fw_card *card; - __be32 *config_rom; size_t length; list_for_each_entry (card, &card_list, link) { - config_rom = generate_config_rom(card, &length); - card->driver->set_config_rom(card, config_rom, length); + length = generate_config_rom(card, tmp_config_rom); + card->driver->set_config_rom(card, tmp_config_rom, length); } } @@ -443,7 +441,6 @@ EXPORT_SYMBOL(fw_card_initialize); int fw_card_add(struct fw_card *card, u32 max_receive, u32 link_speed, u64 guid) { - __be32 *config_rom; size_t length; int ret; @@ -453,8 +450,8 @@ int fw_card_add(struct fw_card *card, mutex_lock(&card_mutex); - config_rom = generate_config_rom(card, &length); - ret = card->driver->enable(card, config_rom, length); + length = generate_config_rom(card, tmp_config_rom); + ret = card->driver->enable(card, tmp_config_rom, length); if (ret == 0) list_add_tail(&card->link, &card_list); -- cgit v1.2.3 From cb7c96da3651111efbe088fa12f9bed61836ea93 Mon Sep 17 00:00:00 2001 From: Stefan Richter Date: Thu, 8 Oct 2009 00:42:53 +0200 Subject: firewire: core: optimize Topology Map creation The Topology Map of the local node was created in CPU byte order, then a temporary big endian copy was created to compute the CRC, and when a read request to the Topology Map arrived it had to be converted to big endian byte order again. We now generate it in big endian byte order in the first place. This also rids us of 1000 bytes stack usage in tasklet context. Signed-off-by: Stefan Richter --- drivers/firewire/core-card.c | 17 ++--------------- 1 file changed, 2 insertions(+), 15 deletions(-) (limited to 'drivers/firewire/core-card.c') diff --git a/drivers/firewire/core-card.c b/drivers/firewire/core-card.c index f58130789990..7083bcc1b9c7 100644 --- a/drivers/firewire/core-card.c +++ b/drivers/firewire/core-card.c @@ -38,7 +38,7 @@ #include "core.h" -static int __compute_block_crc(__be32 *block) +int fw_compute_block_crc(__be32 *block) { int length; u16 crc; @@ -50,19 +50,6 @@ static int __compute_block_crc(__be32 *block) return length; } -int fw_compute_block_crc(u32 *block) -{ - __be32 be32_block[256]; - int i, length; - - length = (*block >> 16) & 0xff; - for (i = 0; i < length; i++) - be32_block[i] = cpu_to_be32(block[i + 1]); - *block |= crc_itu_t(0, (u8 *) be32_block, length * 4); - - return length; -} - static DEFINE_MUTEX(card_mutex); static LIST_HEAD(card_list); @@ -141,7 +128,7 @@ static size_t generate_config_rom(struct fw_card *card, __be32 *config_rom) * the bus info block, which is always the case for this * implementation. */ for (i = 0; i < j; i += length + 1) - length = __compute_block_crc(config_rom + i); + length = fw_compute_block_crc(config_rom + i); return j; } -- cgit v1.2.3