diff options
| author | Rohit Vaswani <rvaswani@codeaurora.org> | 2014-06-26 21:29:37 -0700 |
|---|---|---|
| committer | Rohit Vaswani <rvaswani@codeaurora.org> | 2016-03-01 12:22:10 -0800 |
| commit | abf6131264e60ad0ae85191fd1e70928f40fd2c7 (patch) | |
| tree | fece2020723869485a43250daccb6617f05d8e12 | |
| parent | 47ae5b18729dcd554e28bd414d005c2c515e293b (diff) | |
ARM64: smp: Save CPU registers before IPI_CPU_STOP processing
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
procesing the IPI) into a globally accessible structure and print them on
the dmesg/console to allow for easier post-mortem debugging.
Change-Id: Ifd7589af4327992540196c87f8b640045d7eaf19
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
[abhimany: resolve trivial merge conflic]
Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>
| -rw-r--r-- | arch/arm64/kernel/smp.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index b1adc51b2c2e..3349cb6e5cbe 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -680,15 +680,19 @@ void arch_irq_work_raise(void) static DEFINE_RAW_SPINLOCK(stop_lock); +static struct pt_regs __percpu 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); } @@ -727,7 +731,7 @@ 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; |