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ARM64: smp: Save CPU registers before IPI_CPU_STOP processing

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When a kernel panic occurs on one CPU, other CPUs are instructed to stop
execution via the IPI_CPU_STOP message. These other CPUs dump their stack,
which may not be good enough to reconstruct their context to perform
post-mortem analysis. Dump each CPU's context (before it started
processing the IPI) into a globally accessible structure and print them on
the dmesg/console to allow for easier post-mortem debugging.

[eberman@codeaurora.org: make regs_before_stop static]
Change-Id: Ifd7589af4327992540196c87f8b640045d7eaf19
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
Signed-off-by: Elliot Berman <eberman@codeaurora.org>
This commit is contained in:
Rohit Vaswani 2014-06-26 21:29:37 -07:00 • committed by Elliot Berman
commit a0f944eb08
1 changed files with 8 additions and 2 deletions
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10
arch/arm64/kernel/smp.c
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@ -49,6 +49,7 @@
#include <asm/tlbflush.h>
#include <asm/ptrace.h>
#include <asm/virt.h>
#include <asm/system_misc.h>
#define CREATE_TRACE_POINTS
#include <trace/events/ipi.h>
@ -835,15 +836,20 @@ void arch_irq_work_raise(void)
#endif
static DEFINE_RAW_SPINLOCK(stop_lock);
static DEFINE_PER_CPU(struct pt_regs, regs_before_stop);
/*
* ipi_cpu_stop - handle IPI from smp_send_stop()
*/
static void ipi_cpu_stop(unsigned int cpu)
static void ipi_cpu_stop(unsigned int cpu, struct pt_regs *regs)
{
if (system_state == SYSTEM_BOOTING ||
system_state == SYSTEM_RUNNING) {
per_cpu(regs_before_stop, cpu) = *regs;
raw_spin_lock(&stop_lock);
pr_crit("CPU%u: stopping\n", cpu);
__show_regs(regs);
dump_stack();
raw_spin_unlock(&stop_lock);
}
@ -906,7 +912,7 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
case IPI_CPU_STOP:
irq_enter();
ipi_cpu_stop(cpu);
ipi_cpu_stop(cpu, regs);
irq_exit();
break;