From: Michael Neuling <mikey@neuling.org>
To: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
"Shreyas B. Prabhu" <shreyasbp@gmail.com>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] powernv: Clear SPRN_PSSCR when a POWER9 CPU comes online
Date: Wed, 23 Nov 2016 11:32:52 +1100 [thread overview]
Message-ID: <1479861172.6542.62.camel@neuling.org> (raw)
In-Reply-To: <1479838000-380-1-git-send-email-ego@linux.vnet.ibm.com>
On Tue, 2016-11-22 at 23:36 +0530, Gautham R. Shenoy wrote:
> From: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
>=20
> Ensure that PSSCR is set to a safe value corresponding to no
> state-loss each time a POWER9 CPU comes online.
>=20
> Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Tested here on my configuration... FWIW
Acked-By: Michael Neuling <mikey@neuling.org>
> ---
> =C2=A0arch/powerpc/kernel/cpu_setup_power.S | 2 ++
> =C2=A01 file changed, 2 insertions(+)
>=20
> diff --git a/arch/powerpc/kernel/cpu_setup_power.S
> b/arch/powerpc/kernel/cpu_setup_power.S
> index 52ff3f0..37ad045 100644
> --- a/arch/powerpc/kernel/cpu_setup_power.S
> +++ b/arch/powerpc/kernel/cpu_setup_power.S
> @@ -96,6 +96,7 @@ _GLOBAL(__setup_cpu_power9)
> =C2=A0 mtlr r11
> =C2=A0 beqlr
> =C2=A0 li r0,0
> + mtspr SPRN_PSSCR,r0
> =C2=A0 mtspr SPRN_LPID,r0
> =C2=A0 mfspr r3,SPRN_LPCR
> =C2=A0 ori r3, r3, LPCR_PECEDH
> @@ -116,6 +117,7 @@ _GLOBAL(__restore_cpu_power9)
> =C2=A0 mtlr r11
> =C2=A0 beqlr
> =C2=A0 li r0,0
> + mtspr SPRN_PSSCR,r0
> =C2=A0 mtspr SPRN_LPID,r0
> =C2=A0 mfspr=C2=A0=C2=A0=C2=A0r3,SPRN_LPCR
> =C2=A0 ori r3, r3, LPCR_PECEDH
next prev parent reply other threads:[~2016-11-23 0:32 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-22 18:06 [PATCH] powernv: Clear SPRN_PSSCR when a POWER9 CPU comes online Gautham R. Shenoy
2016-11-22 23:30 ` Michael Ellerman
2016-11-22 23:35 ` Michael Neuling
2016-11-23 0:32 ` Michael Neuling [this message]
2016-11-28 12:15 ` Michael Ellerman
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