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powerpc: Add NMI IPI infrastructure

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Add a simple NMI IPI system that handles concurrency and reentrancy.

The platform does not have to implement a true non-maskable interrupt,
the default is to simply use the debugger break IPI message. This has
now been co-opted for a general IPI message, and users (debugger and
crash) have been reimplemented on top of the NMI system.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Incorporate incremental fixes from Nick]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
2016-12-20 04:30:08 +10:00
committed by Michael Ellerman
parent 2b4f3ac564
commit ddd703ca06
5 changed files with 226 additions and 42 deletions
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4
arch/powerpc/platforms/ps3/smp.c
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@@ -77,7 +77,7 @@ static void __init ps3_smp_probe(void)
BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION != 0);
BUILD_BUG_ON(PPC_MSG_RESCHEDULE != 1);
BUILD_BUG_ON(PPC_MSG_TICK_BROADCAST != 2);
BUILD_BUG_ON(PPC_MSG_DEBUGGER_BREAK != 3);
BUILD_BUG_ON(PPC_MSG_NMI_IPI != 3);
for (i = 0; i < MSG_COUNT; i++) {
result = ps3_event_receive_port_setup(cpu, &virqs[i]);
@@ -96,7 +96,7 @@ static void __init ps3_smp_probe(void)
ps3_register_ipi_irq(cpu, virqs[i]);
}
ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_DEBUGGER_BREAK]);
ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_NMI_IPI]);
DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
}