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powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild

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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:
Nathan Lynch 2019-06-11 23:45:04 -05:00 committed by Michael Ellerman
parent 0aa82c482a
commit d4aa219a07
2 changed files with 25 additions and 0 deletions
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21
arch/powerpc/kernel/cacheinfo.c
View File

@ -896,4 +896,25 @@ 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 */

4
arch/powerpc/kernel/cacheinfo.h
View File

@ -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 */