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powerpc/64s: Default l1d_size to 64K in RFI fallback flush
If there is no d-cache-size property in the device tree, l1d_size could
be zero. We don't actually expect that to happen, it's only been seen
on mambo (simulator) in some configurations.
A zero-size l1d_size leads to the loop in the asm wrapping around to
2^64-1, and then walking off the end of the fallback area and
eventually causing a page fault which is fatal.
Just default to 64K which is correct on some CPUs, and sane enough to
not cause a crash on others.
Fixes: aa8a5e0062
('powerpc/64s: Add support for RFI flush of L1-D cache')
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
[mpe: Rewrite comment and change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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@ -890,6 +890,17 @@ static void __ref init_fallback_flush(void)
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return;
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l1d_size = ppc64_caches.l1d.size;
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/*
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* If there is no d-cache-size property in the device tree, l1d_size
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* could be zero. That leads to the loop in the asm wrapping around to
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* 2^64-1, and then walking off the end of the fallback area and
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* eventually causing a page fault which is fatal. Just default to
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* something vaguely sane.
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*/
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if (!l1d_size)
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l1d_size = (64 * 1024);
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limit = min(ppc64_bolted_size(), ppc64_rma_size);
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/*
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