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Date: Fri, 24 Jan 2020 10:30:52 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Nathan Lynch <nathanl@...ux.ibm.com>, "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>, Michael Ellerman <mpe@...erman.id.au>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 4.14 234/343] powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild From: Nathan Lynch <nathanl@...ux.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@...ux.ibm.com> Reviewed-by: Gautham R. Shenoy <ego@...ux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@...erman.id.au> Signed-off-by: Sasha Levin <sashal@...nel.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 a8f20e5928e13..9edb454301336 100644 --- a/arch/powerpc/kernel/cacheinfo.c +++ b/arch/powerpc/kernel/cacheinfo.c @@ -865,4 +865,25 @@ 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 955f5e999f1b8..52bd3fc6642da 100644 --- a/arch/powerpc/kernel/cacheinfo.h +++ b/arch/powerpc/kernel/cacheinfo.h @@ -6,4 +6,8 @@ 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
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