[PATCH v2] eal/x86: enable timeout in AMD power monitor

[Burakov, Anatoly]

On 10/13/2025 7:51 AM, Sivaprasad Tummala wrote:
> Previously, the AMD power monitor implementation did not enable the
> timeout, causing the lcore to remain in a wait state until an external
> monitoring event occurred or an interrupt was received.
> 
> This patch enables the timeout-based exit condition, allowing
> the lcore to automatically wake up after the specified period.
> The maximum supported timeout value is 2^32 - 1.
> 
> Fixes: c7ed1ce04704 ("eal/x86: add power intrinsics for AMD")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Sivaprasad Tummala <sivaprasad.tummala at amd.com>
> 
> v2:
> 1. fixed asm compilation error.
> ---
>   lib/eal/x86/rte_power_intrinsics.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/lib/eal/x86/rte_power_intrinsics.c b/lib/eal/x86/rte_power_intrinsics.c
> index 489ad3983f..8a5f222aea 100644
> --- a/lib/eal/x86/rte_power_intrinsics.c
> +++ b/lib/eal/x86/rte_power_intrinsics.c
> @@ -89,14 +89,14 @@ static void amd_monitorx(volatile void *addr)
>   
>   static void amd_mwaitx(const uint64_t timeout)
>   {
> -	RTE_SET_USED(timeout);
>   #if defined(RTE_TOOLCHAIN_MSVC) || defined(__MWAITX__)
> -	_mm_mwaitx(0, 0, 0);
> +	_mm_mwaitx(2, 0, (uint32_t)timeout);
>   #else
>   	asm volatile(".byte 0x0f, 0x01, 0xfb;"
>   			: /* ignore rflags */
>   			: "a"(0), /* enter C1 */
> -			"c"(0)); /* no time-out */
> +			"b"((uint32_t)timeout),
> +			"c"(2)); /* enable time-out */
>   #endif
>   }
>   

Acked-by: Anatoly Burakov <anatoly.burakov at intel.com>

-- 
Thanks,
Anatoly