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event/octeontx2: use WFE while waiting for head

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Use WFE to save power while waiting for tag to become head.

SSO signals EVENTI to allow cores to exit from wfe when they
are waiting for specific operations in which one of them is
setting HEAD bit in GWS_TAG.

Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
Reviewed-by: Gavin Hu <gavin.hu@arm.com>
This commit is contained in:
Pavan Nikhilesh 2019-10-23 21:42:43 +05:30 committed by Jerin Jacob
parent 206b89c742
commit 23df006e9c
1 changed files with 27 additions and 3 deletions
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30
drivers/event/octeontx2/otx2_worker.h
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@ -226,10 +226,34 @@ otx2_ssogws_swtag_wait(struct otx2_ssogws *ws)
}
static __rte_always_inline void
otx2_ssogws_head_wait(struct otx2_ssogws *ws, const uint8_t wait_flag)
otx2_ssogws_head_wait(struct otx2_ssogws *ws)
{
while (wait_flag && !(otx2_read64(ws->tag_op) & BIT_ULL(35)))
#ifdef RTE_ARCH_ARM64
uint64_t tag;
asm volatile (
" ldr %[tag], [%[tag_op]] \n"
" tbnz %[tag], 35, done%= \n"
" sevl \n"
"rty%=: wfe \n"
" ldr %[tag], [%[tag_op]] \n"
" tbz %[tag], 35, rty%= \n"
"done%=: \n"
: [tag] "=&r" (tag)
: [tag_op] "r" (ws->tag_op)
);
#else
/* Wait for the HEAD to be set */
while (!(otx2_read64(ws->tag_op) & BIT_ULL(35)))
;
#endif
}
static __rte_always_inline void
otx2_ssogws_order(struct otx2_ssogws *ws, const uint8_t wait_flag)
{
if (wait_flag)
otx2_ssogws_head_wait(ws);
rte_cio_wmb();
}
@ -258,7 +282,7 @@ otx2_ssogws_event_tx(struct otx2_ssogws *ws, struct rte_event ev[],
/* Perform header writes before barrier for TSO */
otx2_nix_xmit_prepare_tso(m, flags);
otx2_ssogws_head_wait(ws, !ev->sched_type);
otx2_ssogws_order(ws, !ev->sched_type);
otx2_ssogws_prepare_pkt(txq, m, cmd, flags);
if (flags & NIX_TX_MULTI_SEG_F) {