From: Pratik Rajesh Sampat <psampat@linux.ibm.com>
To: mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org,
mikey@neuling.org, ravi.bangoria@linux.ibm.com,
ego@linux.vnet.ibm.com, svaidy@linux.ibm.com,
psampat@linux.ibm.com, pratik.r.sampat@gmail.com,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 2/3] powerpc/powernv/idle: save-restore DAWR0, DAWRX0 for P10
Date: Fri, 10 Jul 2020 10:52:06 +0530 [thread overview]
Message-ID: <20200710052207.12003-3-psampat@linux.ibm.com> (raw)
In-Reply-To: <20200710052207.12003-1-psampat@linux.ibm.com>
Additional registers DAWR0, DAWRX0 may be lost on Power 10 for
stop levels < 4.
Therefore save the values of these SPRs before entering a "stop"
state and restore their values on wakeup.
Signed-off-by: Pratik Rajesh Sampat <psampat@linux.ibm.com>
---
arch/powerpc/platforms/powernv/idle.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/powerpc/platforms/powernv/idle.c b/arch/powerpc/platforms/powernv/idle.c
index 19d94d021357..f2e2a6a4c274 100644
--- a/arch/powerpc/platforms/powernv/idle.c
+++ b/arch/powerpc/platforms/powernv/idle.c
@@ -600,6 +600,8 @@ struct p9_sprs {
u64 iamr;
u64 amor;
u64 uamor;
+ u64 dawr0;
+ u64 dawrx0;
};
static unsigned long power9_idle_stop(unsigned long psscr, bool mmu_on)
@@ -687,6 +689,10 @@ static unsigned long power9_idle_stop(unsigned long psscr, bool mmu_on)
sprs.iamr = mfspr(SPRN_IAMR);
sprs.amor = mfspr(SPRN_AMOR);
sprs.uamor = mfspr(SPRN_UAMOR);
+ if (cpu_has_feature(CPU_FTR_ARCH_31)) {
+ sprs.dawr0 = mfspr(SPRN_DAWR0);
+ sprs.dawrx0 = mfspr(SPRN_DAWRX0);
+ }
srr1 = isa300_idle_stop_mayloss(psscr); /* go idle */
@@ -710,6 +716,10 @@ static unsigned long power9_idle_stop(unsigned long psscr, bool mmu_on)
mtspr(SPRN_IAMR, sprs.iamr);
mtspr(SPRN_AMOR, sprs.amor);
mtspr(SPRN_UAMOR, sprs.uamor);
+ if (cpu_has_feature(CPU_FTR_ARCH_31)) {
+ mtspr(SPRN_DAWR0, sprs.dawr0);
+ mtspr(SPRN_DAWRX0, sprs.dawrx0);
+ }
/*
* Workaround for POWER9 DD2.0, if we lost resources, the ERAT
--
2.25.4
next prev parent reply other threads:[~2020-07-10 5:26 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-10 5:22 [PATCH v2 0/3] Power10 basic energy management Pratik Rajesh Sampat
2020-07-10 5:22 ` [PATCH v2 1/3] powerpc/powernv/idle: Exclude mfspr on HID1, 4, 5 on P9 and above Pratik Rajesh Sampat
2020-07-13 5:53 ` Nicholas Piggin
2020-07-10 5:22 ` Pratik Rajesh Sampat [this message]
2020-07-13 5:52 ` [PATCH v2 2/3] powerpc/powernv/idle: save-restore DAWR0, DAWRX0 for P10 Nicholas Piggin
2020-07-20 4:30 ` Ravi Bangoria
2020-07-20 4:24 ` [PATCH v2 2/3] powerpc/powernv/idle: save-restore DAWR0,DAWRX0 " Ravi Bangoria
2020-07-24 1:25 ` Michael Neuling
2020-07-24 6:34 ` Pratik Sampat
2020-07-10 5:22 ` [PATCH v2 3/3] powerpc/powernv/idle: Rename pnv_first_spr_loss_level variable Pratik Rajesh Sampat
2020-07-13 5:23 ` [PATCH v2 0/3] Power10 basic energy management Nicholas Piggin
2020-07-13 10:02 ` Pratik Sampat
2020-07-13 16:50 ` Nicholas Piggin
2020-07-13 18:27 ` Pratik Sampat
2020-07-13 10:48 ` Gautham R Shenoy
2020-07-13 16:58 ` Nicholas Piggin
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