linux-kernel - [PATCH 04/17] powerpc/smp: Add num_available_cores callback for smp

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Message-ID: <20251204175405.1511340-5-srikar@linux.ibm.com>
Date: Thu,  4 Dec 2025 23:23:52 +0530
From: Srikar Dronamraju <srikar@...ux.ibm.com>
To: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Peter Zijlstra <peterz@...radead.org>
Cc: Ben Segall <bsegall@...gle.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Ingo Molnar <mingo@...nel.org>, Juri Lelli <juri.lelli@...hat.com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Mel Gorman <mgorman@...e.de>, Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Shrikanth Hegde <sshegde@...ux.ibm.com>,
        Srikar Dronamraju <srikar@...ux.ibm.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Swapnil Sapkal <swapnil.sapkal@....com>,
        Thomas Huth <thuth@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        virtualization@...ts.linux.dev, Yicong Yang <yangyicong@...ilicon.com>,
        Ilya Leoshkevich <iii@...ux.ibm.com>
Subject: [PATCH 04/17] powerpc/smp: Add num_available_cores callback for smp_ops

num_available_cores callback will update the current number of available
cores. If num_available_cores() callback is not defined, then assume
all cores are available.

Signed-off-by: Srikar Dronamraju <srikar@...ux.ibm.com>
---
 arch/powerpc/include/asm/smp.h | 3 +++
 arch/powerpc/kernel/smp.c      | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/arch/powerpc/include/asm/smp.h b/arch/powerpc/include/asm/smp.h
index e41b9ea42122..fe6315057474 100644
--- a/arch/powerpc/include/asm/smp.h
+++ b/arch/powerpc/include/asm/smp.h
@@ -60,6 +60,9 @@ struct smp_ops_t {
 #ifdef CONFIG_HOTPLUG_CPU
 	void  (*cpu_offline_self)(void);
 #endif
+#ifdef CONFIG_PPC_SPLPAR
+	unsigned int (*num_available_cores)(void);
+#endif
 };
 
 extern struct task_struct *secondary_current;
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 68edb66c2964..c33e9928a2b0 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -1732,6 +1732,11 @@ void __init smp_cpus_done(unsigned int max_cpus)
 
 	dump_numa_cpu_topology();
 	build_sched_topology();
+
+#ifdef CONFIG_PPC_SPLPAR
+	if (smp_ops->num_available_cores)
+		smp_ops->num_available_cores();
+#endif
 }
 
 /*
-- 
2.43.7