From: Sasha Levin <sashal@kernel.org> To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Nathan Lynch <nathanl@linux.ibm.com>, "Gautham R . Shenoy" <ego@linux.vnet.ibm.com>, linuxppc-dev@lists.ozlabs.org, Sasha Levin <sashal@kernel.org> Subject: [PATCH AUTOSEL 4.9 152/251] powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild Date: Thu, 16 Jan 2020 12:35:01 -0500 Message-ID: <20200116173641.22137-112-sashal@kernel.org> (raw) In-Reply-To: <20200116173641.22137-1-sashal@kernel.org> From: Nathan Lynch <nathanl@linux.ibm.com> [ Upstream commit d4aa219a074a5abaf95a756b9f0d190b5c03a945 ] Allow external callers to force the cacheinfo code to release all its references to cache nodes, e.g. before processing device tree updates post-migration, and to rebuild the hierarchy afterward. CPU online/offline must be blocked by callers; enforce this. Fixes: 410bccf97881 ("powerpc/pseries: Partition migration in the kernel") Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com> Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Sasha Levin <sashal@kernel.org> --- arch/powerpc/kernel/cacheinfo.c | 21 +++++++++++++++++++++ arch/powerpc/kernel/cacheinfo.h | 4 ++++ 2 files changed, 25 insertions(+) diff --git a/arch/powerpc/kernel/cacheinfo.c b/arch/powerpc/kernel/cacheinfo.c index c641983bbdd6..0122d5ce0637 100644 --- a/arch/powerpc/kernel/cacheinfo.c +++ b/arch/powerpc/kernel/cacheinfo.c @@ -867,4 +867,25 @@ void cacheinfo_cpu_offline(unsigned int cpu_id) if (cache) cache_cpu_clear(cache, cpu_id); } + +void cacheinfo_teardown(void) +{ + unsigned int cpu; + + lockdep_assert_cpus_held(); + + for_each_online_cpu(cpu) + cacheinfo_cpu_offline(cpu); +} + +void cacheinfo_rebuild(void) +{ + unsigned int cpu; + + lockdep_assert_cpus_held(); + + for_each_online_cpu(cpu) + cacheinfo_cpu_online(cpu); +} + #endif /* (CONFIG_PPC_PSERIES && CONFIG_SUSPEND) || CONFIG_HOTPLUG_CPU */ diff --git a/arch/powerpc/kernel/cacheinfo.h b/arch/powerpc/kernel/cacheinfo.h index a7b74d36acd7..2cdee87a482c 100644 --- a/arch/powerpc/kernel/cacheinfo.h +++ b/arch/powerpc/kernel/cacheinfo.h @@ -5,4 +5,8 @@ extern void cacheinfo_cpu_online(unsigned int cpu_id); extern void cacheinfo_cpu_offline(unsigned int cpu_id); +/* Allow migration/suspend to tear down and rebuild the hierarchy. */ +extern void cacheinfo_teardown(void); +extern void cacheinfo_rebuild(void); + #endif /* _PPC_CACHEINFO_H */ -- 2.20.1
next prev parent reply index Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <20200116173641.22137-1-sashal@kernel.org> 2020-01-16 17:33 ` [PATCH AUTOSEL 4.9 043/251] ASoC: imx-sgtl5000: put of nodes if finding codec fails Sasha Levin 2020-01-16 17:34 ` [PATCH AUTOSEL 4.9 110/251] soc/fsl/qe: Fix an error code in qe_pin_request() Sasha Levin 2020-01-16 17:34 ` [PATCH AUTOSEL 4.9 117/251] powerpc: vdso: Make vdso32 installation conditional in vdso_install Sasha Levin 2020-01-16 17:35 ` Sasha Levin [this message] 2020-01-16 17:35 ` [PATCH AUTOSEL 4.9 159/251] perf/ioctl: Add check for the sample_period value Sasha Levin 2020-01-16 17:35 ` [PATCH AUTOSEL 4.9 174/251] ALSA: aoa: onyx: always initialize register read value Sasha Levin 2020-01-16 17:36 ` [PATCH AUTOSEL 4.9 246/251] powerpc/powernv: Disable native PCIe port management Sasha Levin 2020-01-16 17:36 ` [PATCH AUTOSEL 4.9 250/251] powerpc/archrandom: fix arch_get_random_seed_int() Sasha Levin
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