From: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Neuling <mikey@neuling.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,
"Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
Subject: [PATCH] powernv: Clear SPRN_PSSCR when a POWER9 CPU comes online
Date: Tue, 22 Nov 2016 23:36:40 +0530 [thread overview]
Message-ID: <1479838000-380-1-git-send-email-ego@linux.vnet.ibm.com> (raw)
From: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
Ensure that PSSCR is set to a safe value corresponding to no
state-loss each time a POWER9 CPU comes online.
Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
---
arch/powerpc/kernel/cpu_setup_power.S | 2 ++
1 file changed, 2 insertions(+)
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)
mtlr r11
beqlr
li r0,0
+ mtspr SPRN_PSSCR,r0
mtspr SPRN_LPID,r0
mfspr r3,SPRN_LPCR
ori r3, r3, LPCR_PECEDH
@@ -116,6 +117,7 @@ _GLOBAL(__restore_cpu_power9)
mtlr r11
beqlr
li r0,0
+ mtspr SPRN_PSSCR,r0
mtspr SPRN_LPID,r0
mfspr r3,SPRN_LPCR
ori r3, r3, LPCR_PECEDH
--
1.9.4
next reply other threads:[~2016-11-22 18:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-22 18:06 Gautham R. Shenoy [this message]
2016-11-22 23:30 ` [PATCH] powernv: Clear SPRN_PSSCR when a POWER9 CPU comes online Michael Ellerman
2016-11-22 23:35 ` Michael Neuling
2016-11-23 0:32 ` Michael Neuling
2016-11-28 12:15 ` Michael Ellerman
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