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path: root/drivers/infiniband/hw/hfi1/iowait.c
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Diffstat (limited to 'drivers/infiniband/hw/hfi1/iowait.c')
-rw-r--r--drivers/infiniband/hw/hfi1/iowait.c34
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;
+}