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authorMahesh Salgaonkar <mahesh@linux.vnet.ibm.com>2013-10-30 20:04:00 +0530
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-12-05 16:02:05 +1100
commit729b0f715371ce1e7636b4958fc45d6882442456 (patch)
tree10563ebf4b7536a781eef24ce2e09025f519d275 /arch/powerpc/xmon
parentb14a7253cf999412e5a0dd39d58b0a42d19fd73a (diff)
powerpc/book3s: Introduce exclusive emergency stack for machine check exception.
This patch introduces exclusive emergency stack for machine check exception. We use emergency stack to handle machine check exception so that we can save MCE information (srr1, srr0, dar and dsisr) before turning on ME bit and be ready for re-entrancy. This helps us to prevent clobbering of MCE information in case of nested machine checks. The reason for using emergency stack over normal kernel stack is that the machine check might occur in the middle of setting up a stack frame which may result into improper use of kernel stack. Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/xmon')
-rw-r--r--arch/powerpc/xmon/xmon.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index af9d3469fb99..a90731b3d44a 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -2051,6 +2051,10 @@ static void dump_one_paca(int cpu)
DUMP(p, stab_addr, "lx");
#endif
DUMP(p, emergency_sp, "p");
+#ifdef CONFIG_PPC_BOOK3S_64
+ DUMP(p, mc_emergency_sp, "p");
+ DUMP(p, in_mce, "x");
+#endif
DUMP(p, data_offset, "lx");
DUMP(p, hw_cpu_id, "x");
DUMP(p, cpu_start, "x");