diff options
| author | Asai Thambi S P <asamymuthupa@micron.com> | 2013-04-29 21:19:49 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2013-04-29 21:19:49 +0200 |
| commit | 2077d947260c620550ba06f76aa4affd0106f4da (patch) | |
| tree | 1c81837535f27e94ff0fb6d57db47c0c5cf61bde /drivers/block/mtip32xx/mtip32xx.h | |
| parent | 68466cbf92367c0808bfd2c64bc6faddd7a97b6f (diff) | |
mtip32xx: Workaround for unaligned writes
Workaround for handling unaligned writes: limit number of outstanding
unaligned writes
Signed-off-by: Sam Bradshaw <sbradshaw@micron.com>
Signed-off-by: Asai Thambi S P <asamymuthupa@micron.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/mtip32xx/mtip32xx.h')
| -rw-r--r-- | drivers/block/mtip32xx/mtip32xx.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/block/mtip32xx/mtip32xx.h b/drivers/block/mtip32xx/mtip32xx.h index 3bffff5f670c..579fb84bdd95 100644 --- a/drivers/block/mtip32xx/mtip32xx.h +++ b/drivers/block/mtip32xx/mtip32xx.h @@ -52,6 +52,9 @@ #define MTIP_FTL_REBUILD_MAGIC 0xED51 #define MTIP_FTL_REBUILD_TIMEOUT_MS 2400000 +/* unaligned IO handling */ +#define MTIP_MAX_UNALIGNED_SLOTS 8 + /* Macro to extract the tag bit number from a tag value. */ #define MTIP_TAG_BIT(tag) (tag & 0x1F) @@ -333,6 +336,8 @@ struct mtip_cmd { int scatter_ents; /* Number of scatter list entries used */ + int unaligned; /* command is unaligned on 4k boundary */ + struct scatterlist sg[MTIP_MAX_SG]; /* Scatter list entries */ int retries; /* The number of retries left for this command. */ @@ -452,6 +457,10 @@ struct mtip_port { * command slots available. */ struct semaphore cmd_slot; + + /* Semaphore to control queue depth of unaligned IOs */ + struct semaphore cmd_slot_unal; + /* Spinlock for working around command-issue bug. */ spinlock_t cmd_issue_lock[MTIP_MAX_SLOT_GROUPS]; }; @@ -501,6 +510,8 @@ struct driver_data { atomic_t irq_workers_active; int isr_binding; + + int unal_qdepth; /* qdepth of unaligned IO queue */ }; #endif |