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powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild
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>
This commit is contained in:
parent
0aa82c482a
commit
d4aa219a07
@ -896,4 +896,25 @@ void cacheinfo_cpu_offline(unsigned int cpu_id)
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if (cache)
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if (cache)
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cache_cpu_clear(cache, cpu_id);
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cache_cpu_clear(cache, cpu_id);
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}
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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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#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_online(unsigned int cpu_id);
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extern void cacheinfo_cpu_offline(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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#endif /* _PPC_CACHEINFO_H */
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