diff options
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/mpt3sas/mpt3sas_base.c | 21 | ||||
| -rw-r--r-- | drivers/scsi/mpt3sas/mpt3sas_base.h | 5 |
2 files changed, 26 insertions, 0 deletions
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c index 9a36ea93cfbd..3c3e4745a7b8 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_base.c +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c @@ -1382,6 +1382,16 @@ union reply_descriptor { } u; }; +static u32 base_mod64(u64 dividend, u32 divisor) +{ + u32 remainder; + + if (!divisor) + pr_err("mpt3sas: DIVISOR is zero, in div fn\n"); + remainder = do_div(dividend, divisor); + return remainder; +} + /** * _base_process_reply_queue - Process reply descriptors from reply * descriptor post queue. @@ -2845,6 +2855,11 @@ _base_assign_reply_queues(struct MPT3SAS_ADAPTER *ioc) if (!_base_is_controller_msix_enabled(ioc)) return; + ioc->msix_load_balance = false; + if (ioc->reply_queue_count < num_online_cpus()) { + ioc->msix_load_balance = true; + return; + } memset(ioc->cpu_msix_table, 0, ioc->cpu_msix_table_sz); @@ -3248,6 +3263,12 @@ mpt3sas_base_get_reply_virt_addr(struct MPT3SAS_ADAPTER *ioc, u32 phys_addr) static inline u8 _base_get_msix_index(struct MPT3SAS_ADAPTER *ioc) { + /* Enables reply_queue load balancing */ + if (ioc->msix_load_balance) + return ioc->reply_queue_count ? + base_mod64(atomic64_add_return(1, + &ioc->total_io_cnt), ioc->reply_queue_count) : 0; + return ioc->cpu_msix_table[raw_smp_processor_id()]; } diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.h b/drivers/scsi/mpt3sas/mpt3sas_base.h index fb572cdb751e..3895407183ff 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_base.h +++ b/drivers/scsi/mpt3sas/mpt3sas_base.h @@ -1024,6 +1024,9 @@ typedef void (*MPT3SAS_FLUSH_RUNNING_CMDS)(struct MPT3SAS_ADAPTER *ioc); * @msix_vector_count: number msix vectors * @cpu_msix_table: table for mapping cpus to msix index * @cpu_msix_table_sz: table size + * @total_io_cnt: Gives total IO count, used to load balance the interrupts + * @msix_load_balance: Enables load balancing of interrupts across + * the multiple MSIXs * @schedule_dead_ioc_flush_running_cmds: callback to flush pending commands * @scsi_io_cb_idx: shost generated commands * @tm_cb_idx: task management commands @@ -1200,6 +1203,8 @@ struct MPT3SAS_ADAPTER { u32 ioc_reset_count; MPT3SAS_FLUSH_RUNNING_CMDS schedule_dead_ioc_flush_running_cmds; u32 non_operational_loop; + atomic64_t total_io_cnt; + bool msix_load_balance; /* internal commands, callback index */ u8 scsi_io_cb_idx; |