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powerpc/64s: Disallow system reset vs system reset reentrancy

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In preparation for using a dedicated stack for system reset interrupts,
prevent a nested system reset from recovering, in order to simplify
code that is called in crash/debug path. This allows a system reset
interrupt to just use the base stack pointer.

Keep an in_nmi nesting counter similarly to the in_mce counter. Consider
the interrrupt non-recoverable if it is taken inside another system
reset.

Interrupt nesting could be allowed similarly to MCE, but system reset
is a special case that's not for normal operation, so simplicity wins
until there is requirement for nested system reset interrupts.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
2016-12-20 04:30:05 +10:00
committed by Michael Ellerman
parent a3d96f70c1
commit c4f3b52ce7
6 changed files with 51 additions and 7 deletions
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arch/powerpc/xmon/xmon.c
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@@ -2236,6 +2236,7 @@ static void dump_one_paca(int cpu)
DUMP(p, emergency_sp, "p");
#ifdef CONFIG_PPC_BOOK3S_64
DUMP(p, mc_emergency_sp, "p");
DUMP(p, in_nmi, "x");
DUMP(p, in_mce, "x");
DUMP(p, hmi_event_available, "x");
#endif