diff options
Diffstat (limited to 'drivers/infiniband/hw/hfi1/iowait.c')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/iowait.c | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/hfi1/iowait.c b/drivers/infiniband/hw/hfi1/iowait.c index 582f1ba136ff..adb4a1ba921b 100644 --- a/drivers/infiniband/hw/hfi1/iowait.c +++ b/drivers/infiniband/hw/hfi1/iowait.c @@ -6,6 +6,9 @@ #include "iowait.h" #include "trace_iowait.h" +/* 1 priority == 16 starve_cnt */ +#define IOWAIT_PRIORITY_STARVE_SHIFT 4 + void iowait_set_flag(struct iowait *wait, u32 flag) { trace_hfi1_iowait_set(wait, flag); @@ -44,7 +47,8 @@ void iowait_init(struct iowait *wait, u32 tx_limit, uint seq, bool pkts_sent), void (*wakeup)(struct iowait *wait, int reason), - void (*sdma_drained)(struct iowait *wait)) + void (*sdma_drained)(struct iowait *wait), + void (*init_priority)(struct iowait *wait)) { int i; @@ -58,6 +62,7 @@ void iowait_init(struct iowait *wait, u32 tx_limit, wait->sleep = sleep; wait->wakeup = wakeup; wait->sdma_drained = sdma_drained; + wait->init_priority = init_priority; wait->flags = 0; for (i = 0; i < IOWAIT_SES; i++) { wait->wait[i].iow = wait; @@ -92,3 +97,30 @@ int iowait_set_work_flag(struct iowait_work *w) iowait_set_flag(w->iow, IOWAIT_PENDING_TID); return IOWAIT_TID_SE; } + +/** + * iowait_priority_update_top - update the top priority entry + * @w: the iowait struct + * @top: a pointer to the top priority entry + * @idx: the index of the current iowait in an array + * @top_idx: the array index for the iowait entry that has the top priority + * + * This function is called to compare the priority of a given + * iowait with the given top priority entry. The top index will + * be returned. + */ +uint iowait_priority_update_top(struct iowait *w, + struct iowait *top, + uint idx, uint top_idx) +{ + u8 cnt, tcnt; + + /* Convert priority into starve_cnt and compare the total.*/ + cnt = (w->priority << IOWAIT_PRIORITY_STARVE_SHIFT) + w->starved_cnt; + tcnt = (top->priority << IOWAIT_PRIORITY_STARVE_SHIFT) + + top->starved_cnt; + if (cnt > tcnt) + return idx; + else + return top_idx; +} |