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Message-ID: <20231102101009.15104-1-william@wkennington.com> Date: Thu, 2 Nov 2023 03:10:09 -0700 From: "William A. Kennington III" <william@...nnington.com> To: tmaimon77@...il.com, tali.perry1@...il.com, avifishman70@...il.com Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, openbmc@...ts.ozlabs.org, Brian Ma <chma0@...oton.com>, "William A . Kennington III" <william@...nnington.com> Subject: [PATCH v2] ARM: npcm: Add CPU hotplug callbacks for kexec support From: Brian Ma <chma0@...oton.com> Add callbacks required for kexec to function. The NPCM7xx does not expose controls for powering down CPU cores, so just wait in idle loop. Signed-off-by: Brian Ma <chma0@...oton.com> Signed-off-by: William A. Kennington III <william@...nnington.com> --- arch/arm/mach-npcm/platsmp.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/arm/mach-npcm/platsmp.c b/arch/arm/mach-npcm/platsmp.c index 41891d3aa124..6cc7b5894f08 100644 --- a/arch/arm/mach-npcm/platsmp.c +++ b/arch/arm/mach-npcm/platsmp.c @@ -69,10 +69,27 @@ static void __init npcm7xx_smp_prepare_cpus(unsigned int max_cpus) iounmap(scu_base); } +#ifdef CONFIG_HOTPLUG_CPU +static void npcm7xx_cpu_die(unsigned int cpu) +{ + while (1) + cpu_do_idle(); +} + +static int npcm7xx_cpu_kill(unsigned int l_cpu) +{ + return 1; +} +#endif + static struct smp_operations npcm7xx_smp_ops __initdata = { .smp_prepare_cpus = npcm7xx_smp_prepare_cpus, .smp_boot_secondary = npcm7xx_smp_boot_secondary, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_die = npcm7xx_cpu_die, + .cpu_kill = npcm7xx_cpu_kill, +#endif }; CPU_METHOD_OF_DECLARE(npcm7xx_smp, "nuvoton,npcm750-smp", &npcm7xx_smp_ops); -- 2.42.0.820.g83a721a137-goog
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