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a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=wP3pNCr1ah4A:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=7CQSdrXTAAAA:8 a=JfrnYn6hAAAA:8 a=yPCof4ZbAAAA:8 a=C9KTRrY6tsI4kfzUhbwA:9 a=a-qgeE7W1pNrGK8U0ZQC:22 a=1CNFftbPRP8L7MoqJWF3:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMjE1MDA0MSBTYWx0ZWRfXzNpQhCfsWRUr WtjjWOrgaQhcRwxg92ZwRIvfxoEq+eXgc3yu95jMN1IYQ8BX7iCPUhhKovHENUfQUk1GOH/7XXj qQSrE9edZ16EalH0kLlFLJQGYvixKHlC+9JphPELZVMTAXzltGX6CLM9qMkM5xml99wOtBMwF0x 9hAlH9ix2YLMsokL96WAOBhHfWhS52V7OD53CgiuHf9muwGP/qd2H76zLqXbn/lpKjqJAfUe3lc NihAYVyu6E0cnnyg41YPIcVIpEGVoUFR7+W49nKFfJhIav13mdzmriabZvRUFJ/uWVz3K8mAjem e+UG+qGQTUPGC0HnT4NPAUjWQ6CBwv7/rMzoXfOxUpwlN6MnLVuJ/J+vPO1op/MXTa3flGnHKdg UCH1eqkUFyQREawxufYI0IhJ+0wVYg== X-Proofpoint-ORIG-GUID: BufA6kXQ9VeEzNJclsScW2Qe7R5iuXGw X-Proofpoint-GUID: BufA6kXQ9VeEzNJclsScW2Qe7R5iuXGw Content-Type: text/plain; charset="utf-8" Support waiting in smp_cond_load_relaxed_timeout() via __cmpwait_relaxed(). To ensure that we wake from waiting in WFE periodically and don't block forever if there are no stores to ptr, this path is only used when the event-stream is enabled. Note that when using __cmpwait_relaxed() we ignore the timeout value, allowing an overshoot by upto the event-stream period. And, in the unlikely event that the event-stream is unavailable, fallback to spin-waiting. Also set SMP_TIMEOUT_POLL_COUNT to 1 so we do the time-check in each iteration of smp_cond_load_relaxed_timeout(). Cc: Arnd Bergmann Cc: Will Deacon Cc: Catalin Marinas Cc: linux-arm-kernel@lists.infradead.org Suggested-by: Will Deacon Signed-off-by: Ankur Arora --- Notes: - cpu_poll_relax() now takes an additional parameter. - added a comment detailing why we define SMP_TIMEOUT_POLL_COUNT=3D1 and how it ties up with smp_cond_load_relaxed_timeout(). - explicitly include for cpu_relax(). arch/arm64/include/asm/barrier.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barr= ier.h index 9495c4441a46..6190e178db51 100644 --- a/arch/arm64/include/asm/barrier.h +++ b/arch/arm64/include/asm/barrier.h @@ -12,6 +12,7 @@ #include =20 #include +#include =20 #define __nops(n) ".rept " #n "\nnop\n.endr\n" #define nops(n) asm volatile(__nops(n)) @@ -219,6 +220,26 @@ do { \ (typeof(*ptr))VAL; \ }) =20 +/* Re-declared here to avoid include dependency. */ +extern bool arch_timer_evtstrm_available(void); + +/* + * In the common case, cpu_poll_relax() sits waiting in __cmpwait_relaxed() + * for the ptr value to change. + * + * Since this period is reasonably long, choose SMP_TIMEOUT_POLL_COUNT + * to be 1, so smp_cond_load_{relaxed,acquire}_timeout() does a + * time-check in each iteration. + */ +#define SMP_TIMEOUT_POLL_COUNT 1 + +#define cpu_poll_relax(ptr, val, timeout_ns) do { \ + if (arch_timer_evtstrm_available()) \ + __cmpwait_relaxed(ptr, val); \ + else \ + cpu_relax(); \ +} while (0) + #include =20 #endif /* __ASSEMBLER__ */ --=20 2.31.1