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powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild
[ Upstream commitd4aa219a07
] 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:410bccf978
("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>
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2 changed files with 25 additions and 0 deletions
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@ -865,4 +865,25 @@ void cacheinfo_cpu_offline(unsigned int cpu_id)
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if (cache)
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cache_cpu_clear(cache, cpu_id);
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}
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void cacheinfo_teardown(void)
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{
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unsigned int cpu;
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lockdep_assert_cpus_held();
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for_each_online_cpu(cpu)
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cacheinfo_cpu_offline(cpu);
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}
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void cacheinfo_rebuild(void)
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{
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unsigned int cpu;
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lockdep_assert_cpus_held();
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for_each_online_cpu(cpu)
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cacheinfo_cpu_online(cpu);
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}
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#endif /* (CONFIG_PPC_PSERIES && CONFIG_SUSPEND) || CONFIG_HOTPLUG_CPU */
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@ -6,4 +6,8 @@
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extern void cacheinfo_cpu_online(unsigned int cpu_id);
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extern void cacheinfo_cpu_offline(unsigned int cpu_id);
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/* Allow migration/suspend to tear down and rebuild the hierarchy. */
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extern void cacheinfo_teardown(void);
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extern void cacheinfo_rebuild(void);
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#endif /* _PPC_CACHEINFO_H */
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