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powerpc/rfi-flush: Make it possible to call setup_rfi_flush() again

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commit abf110f3e1 upstream.

For PowerVM migration we want to be able to call setup_rfi_flush()
again after we've migrated the partition.

To support that we need to check that we're not trying to allocate the
fallback flush area after memblock has gone away (i.e., boot-time only).

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Ellerman
2018-05-26 14:27:31 +10:00
committed by Greg Kroah-Hartman
parent 5412a9d91d
commit d744f8457f
2 changed files with 6 additions and 2 deletions
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2
arch/powerpc/include/asm/setup.h
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@@ -49,7 +49,7 @@ enum l1d_flush_type {
L1D_FLUSH_MTTRIG = 0x8,
};
void __init setup_rfi_flush(enum l1d_flush_type, bool enable);
void setup_rfi_flush(enum l1d_flush_type, bool enable);
void do_rfi_flush_fixups(enum l1d_flush_type types);
#endif /* !__ASSEMBLY__ */

6
arch/powerpc/kernel/setup_64.c
View File

@@ -836,6 +836,10 @@ static void init_fallback_flush(void)
u64 l1d_size, limit;
int cpu;
/* Only allocate the fallback flush area once (at boot time). */
if (l1d_flush_fallback_area)
return;
l1d_size = ppc64_caches.l1d.size;
limit = min(safe_stack_limit(), ppc64_rma_size);
@@ -853,7 +857,7 @@ static void init_fallback_flush(void)
}
}
void __init setup_rfi_flush(enum l1d_flush_type types, bool enable)
void setup_rfi_flush(enum l1d_flush_type types, bool enable)
{
if (types & L1D_FLUSH_FALLBACK) {
pr_info("rfi-flush: Using fallback displacement flush\n");