From ecb1cf9c446ad7e8248160fe6797cd9bed817f24 Mon Sep 17 00:00:00 2001 From: Stefan Richter Date: Sun, 21 Feb 2010 17:57:32 +0100 Subject: [PATCH] firewire: ohci: reorder struct fw_ohci for better cache efficiency The config_rom struct members are only accessed during relatively infrequent self-ID-complete interrupts and only if the local config ROM was changed, while the ar_, at_, ir_, it_ members are used very frequently during I/O. Hence move the config_rom members further down. More importantly, make the huge self_id_buffer member the last one; this is only accessed in self-ID-complete interrupts. Signed-off-by: Stefan Richter --- drivers/firewire/ohci.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index 047331e59b3..39ddb620cad 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -166,9 +166,6 @@ struct fw_ohci { struct fw_card card; __iomem char *registers; - dma_addr_t self_id_bus; - __le32 *self_id_cpu; - struct tasklet_struct bus_reset_tasklet; int node_id; int generation; int request_generation; /* for timestamping incoming requests */ @@ -182,14 +179,6 @@ struct fw_ohci { * this driver with this lock held. */ spinlock_t lock; - u32 self_id_buffer[512]; - - /* Config rom buffers */ - __be32 *config_rom; - dma_addr_t config_rom_bus; - __be32 *next_config_rom; - dma_addr_t next_config_rom_bus; - __be32 next_header; struct ar_context ar_request_ctx; struct ar_context ar_response_ctx; @@ -201,6 +190,18 @@ struct fw_ohci { u64 ir_context_channels; u32 ir_context_mask; struct iso_context *ir_context_list; + + __be32 *config_rom; + dma_addr_t config_rom_bus; + __be32 *next_config_rom; + dma_addr_t next_config_rom_bus; + __be32 next_header; + + __le32 *self_id_cpu; + dma_addr_t self_id_bus; + struct tasklet_struct bus_reset_tasklet; + + u32 self_id_buffer[512]; }; static inline struct fw_ohci *fw_ohci(struct fw_card *card) -- 2.20.1