[PATCH v2] powerpc/powernv: Enable cpuidle state detection for POWER11

[PATCH v2] powerpc/powernv: Enable cpuidle state detection for POWER11

[Aboorva Devarajan]

Extend cpuidle state detection to POWER11 by updating the PVR check.
This ensures POWER11 correctly recognizes supported stop states,
similar to POWER9 and POWER10.

Without Patch: (Power11 - PowerNV systems)

CPUidle driver: powernv_idle
CPUidle governor: menu
analyzing CPU 927:

Number of idle states: 1
Available idle states: snooze
snooze:
Flags/Description: snooze
Latency: 0
Usage: 251631
Duration: 207497715900

--
With Patch: (Power11 - PowerNV systems)

CPUidle driver: powernv_idle
CPUidle governor: menu
analyzing CPU 959:

Number of idle states: 4
Available idle states: snooze stop0_lite stop0 stop3
snooze:
Flags/Description: snooze
Latency: 0
Usage: 2
Duration: 33
stop0_lite:
Flags/Description: stop0_lite
Latency: 1
Usage: 1
Duration: 52
stop0:
Flags/Description: stop0
Latency: 10
Usage: 13
Duration: 1920
stop3:
Flags/Description: stop3
Latency: 45
Usage: 381
Duration: 21638478

Signed-off-by: Aboorva Devarajan <aboorvad@linux.ibm.com>

---

v1: https://lore.kernel.org/all/20250421070718.162783-1-aboorvad@linux.ibm.com/

v1 -> v2: Fixed overly permissive PVR version check as pointed out by
Christophe.

---
 arch/powerpc/platforms/powernv/idle.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/idle.c b/arch/powerpc/platforms/powernv/idle.c
index d98b933e4984..e4f4e907f6e3 100644
--- a/arch/powerpc/platforms/powernv/idle.c
+++ b/arch/powerpc/platforms/powernv/idle.c
@@ -1171,8 +1171,9 @@ static void __init pnv_arch300_idle_init(void)
 	u64 max_residency_ns = 0;
 	int i;
 
-	/* stop is not really architected, we only have p9,p10 drivers */
-	if (!pvr_version_is(PVR_POWER10) && !pvr_version_is(PVR_POWER9))
+	/* stop is not really architected, we only have p9,p10 and p11 drivers */
+	if (!pvr_version_is(PVR_POWER9) && !pvr_version_is(PVR_POWER10) &&
+		!pvr_version_is(PVR_POWER11))
 		return;
 
 	/*
@@ -1189,8 +1190,8 @@ static void __init pnv_arch300_idle_init(void)
 		struct pnv_idle_states_t *state = &pnv_idle_states[i];
 		u64 psscr_rl = state->psscr_val & PSSCR_RL_MASK;
 
-		/* No deep loss driver implemented for POWER10 yet */
-		if (pvr_version_is(PVR_POWER10) &&
+		/* No deep loss driver implemented for POWER10 and POWER11 yet */
+		if ((pvr_version_is(PVR_POWER10) || pvr_version_is(PVR_POWER11)) &&
 				state->flags & (OPAL_PM_TIMEBASE_STOP|OPAL_PM_LOSE_FULL_CONTEXT))
 			continue;
 
-- 
2.47.1

Re: [PATCH v2] powerpc/powernv: Enable cpuidle state detection for POWER11

[Madadi Vineeth Reddy]

Hi Aboorva,

On 08/09/25 14:21, Aboorva Devarajan wrote:
> Extend cpuidle state detection to POWER11 by updating the PVR check.
> This ensures POWER11 correctly recognizes supported stop states,
> similar to POWER9 and POWER10.
> 
> Without Patch: (Power11 - PowerNV systems)
> 
> CPUidle driver: powernv_idle
> CPUidle governor: menu
> analyzing CPU 927:
> 
> Number of idle states: 1
> Available idle states: snooze
> snooze:
> Flags/Description: snooze
> Latency: 0
> Usage: 251631
> Duration: 207497715900
> 
> --
> With Patch: (Power11 - PowerNV systems)
> 
> CPUidle driver: powernv_idle
> CPUidle governor: menu
> analyzing CPU 959:
> 
> Number of idle states: 4
> Available idle states: snooze stop0_lite stop0 stop3
> snooze:
> Flags/Description: snooze
> Latency: 0
> Usage: 2
> Duration: 33
> stop0_lite:
> Flags/Description: stop0_lite
> Latency: 1
> Usage: 1
> Duration: 52
> stop0:
> Flags/Description: stop0
> Latency: 10
> Usage: 13
> Duration: 1920
> stop3:
> Flags/Description: stop3
> Latency: 45
> Usage: 381
> Duration: 21638478

This patch enables correct recognition of P11 supported stop states.

Reviewed-by: Madadi Vineeth Reddy <vineethr@linux.ibm.com>
Tested-by: Madadi Vineeth Reddy <vineethr@linux.ibm.com>

Thanks,
Vineeth

> 
> Signed-off-by: Aboorva Devarajan <aboorvad@linux.ibm.com>
> 
> ---
> 
> v1: https://lore.kernel.org/all/20250421070718.162783-1-aboorvad@linux.ibm.com/
> 
> v1 -> v2: Fixed overly permissive PVR version check as pointed out by
> Christophe.
> 
> ---
>  arch/powerpc/platforms/powernv/idle.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/powernv/idle.c b/arch/powerpc/platforms/powernv/idle.c
> index d98b933e4984..e4f4e907f6e3 100644
> --- a/arch/powerpc/platforms/powernv/idle.c
> +++ b/arch/powerpc/platforms/powernv/idle.c
> @@ -1171,8 +1171,9 @@ static void __init pnv_arch300_idle_init(void)
>  	u64 max_residency_ns = 0;
>  	int i;
>  
> -	/* stop is not really architected, we only have p9,p10 drivers */
> -	if (!pvr_version_is(PVR_POWER10) && !pvr_version_is(PVR_POWER9))
> +	/* stop is not really architected, we only have p9,p10 and p11 drivers */
> +	if (!pvr_version_is(PVR_POWER9) && !pvr_version_is(PVR_POWER10) &&
> +		!pvr_version_is(PVR_POWER11))
>  		return;
>  
>  	/*
> @@ -1189,8 +1190,8 @@ static void __init pnv_arch300_idle_init(void)
>  		struct pnv_idle_states_t *state = &pnv_idle_states[i];
>  		u64 psscr_rl = state->psscr_val & PSSCR_RL_MASK;
>  
> -		/* No deep loss driver implemented for POWER10 yet */
> -		if (pvr_version_is(PVR_POWER10) &&
> +		/* No deep loss driver implemented for POWER10 and POWER11 yet */
> +		if ((pvr_version_is(PVR_POWER10) || pvr_version_is(PVR_POWER11)) &&
>  				state->flags & (OPAL_PM_TIMEBASE_STOP|OPAL_PM_LOSE_FULL_CONTEXT))
>  			continue;
>  

Re: [PATCH v2] powerpc/powernv: Enable cpuidle state detection for POWER11

[Madhavan Srinivasan]

On Mon, 08 Sep 2025 14:21:23 +0530, Aboorva Devarajan wrote:
> Extend cpuidle state detection to POWER11 by updating the PVR check.
> This ensures POWER11 correctly recognizes supported stop states,
> similar to POWER9 and POWER10.
> 
> Without Patch: (Power11 - PowerNV systems)
> 
> CPUidle driver: powernv_idle
> CPUidle governor: menu
> analyzing CPU 927:
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc/powernv: Enable cpuidle state detection for POWER11
      https://git.kernel.org/powerpc/c/fbe409d138b1d8a8b91cdad19cf95495e8ebe1ee

cheers