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powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild

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[ 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: 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>
This commit is contained in:
Nathan Lynch 2019-06-11 23:45:04 -05:00 • committed by Greg Kroah-Hartman
parent a1ab56ebe4
commit fb5c1d13a7
2 changed files with 21 additions and 0 deletions
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17
arch/powerpc/kernel/cacheinfo.c
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@ -867,4 +867,21 @@ void cacheinfo_cpu_offline(unsigned int cpu_id)
if (cache)
cache_cpu_clear(cache, cpu_id);
}
void cacheinfo_teardown(void)
{
unsigned int cpu;
for_each_online_cpu(cpu)
cacheinfo_cpu_offline(cpu);
}
void cacheinfo_rebuild(void)
{
unsigned int cpu;
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

@ -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 */