From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Mark Rutland <mark.rutland@arm.com>,
Valentin Schneider <vschneid@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
"Paul E. McKenney" <paulmck@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"ndesaulniers@google.com" <ndesaulniers@google.com>,
linux-kernel@vger.kernel.org, Aneesh <aneesh.kumar@kernel.org>,
Rohan McLure <rmclure@linux.ibm.com>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
Josh Poimboeuf <jpoimboe@kernel.org>
Subject: [PATCH v5 2/5] powerpc/smp: Disable MC domain for shared processor
Date: Thu, 14 Dec 2023 23:37:12 +0530 [thread overview]
Message-ID: <20231214180720.310852-3-srikar@linux.vnet.ibm.com> (raw)
In-Reply-To: <20231214180720.310852-1-srikar@linux.vnet.ibm.com>
Like L2-cache info, coregroup information which is used to determine MC
sched domains is only present on dedicated LPARs. i.e PowerVM doesn't
export coregroup information for shared processor LPARs. Hence disable
creating MC domains on shared LPAR Systems.
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
---
arch/powerpc/kernel/smp.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 3fc8ad9646a4..2cebc53e97f9 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -1055,6 +1055,10 @@ static struct cpumask *cpu_coregroup_mask(int cpu)
static bool has_coregroup_support(void)
{
+ /* Coregroup identification not available on shared systems */
+ if (is_shared_processor())
+ return 0;
+
return coregroup_enabled;
}
--
2.35.3
next prev parent reply other threads:[~2023-12-14 18:10 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-14 18:07 [PATCH v5 0/5] powerpc/smp: Topology and shared processor optimizations Srikar Dronamraju
2023-12-14 18:07 ` [PATCH v5 1/5] powerpc/smp: Enable Asym packing for cores on shared processor Srikar Dronamraju
2023-12-15 5:01 ` Aneesh Kumar K.V
2023-12-14 18:07 ` Srikar Dronamraju [this message]
2023-12-14 18:07 ` [PATCH v5 3/5] powerpc/smp: Add __ro_after_init attribute Srikar Dronamraju
2023-12-14 18:07 ` [PATCH v5 4/5] powerpc/smp: Avoid asym packing within thread_group of a core Srikar Dronamraju
2023-12-14 18:07 ` [PATCH v5 5/5] powerpc/smp: Dynamically build Powerpc topology Srikar Dronamraju
2023-12-21 10:38 ` [PATCH v5 0/5] powerpc/smp: Topology and shared processor optimizations Michael Ellerman
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