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powerpc/book3s: Flush SLB/TLBs if we get SLB/TLB machine check errors on power7.

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If we get a machine check exception due to SLB or TLB errors, then flush
SLBs/TLBs and reload SLBs to recover. We do this in real mode before turning
on MMU. Otherwise we would run into nested machine checks.

If we get a machine check when we are in guest, then just flush the
SLBs and continue. This patch handles errors for power7. The next
patch will handle errors for power8

Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Mahesh Salgaonkar
2013-10-30 20:05:11 +05:30
committed by Benjamin Herrenschmidt
parent 0440705049
commit e22a22740c
5 changed files with 227 additions and 0 deletions
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5
arch/powerpc/include/asm/bitops.h
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@@ -46,6 +46,11 @@
#include <asm/asm-compat.h>
#include <asm/synch.h>
/* PPC bit number conversion */
#define PPC_BITLSHIFT(be) (BITS_PER_LONG - 1 - (be))
#define PPC_BIT(bit) (1UL << PPC_BITLSHIFT(bit))
#define PPC_BITMASK(bs, be) ((PPC_BIT(bs) - PPC_BIT(be)) | PPC_BIT(bs))
/*
* clear_bit doesn't imply a memory barrier
*/