From: Helge Deller <deller@gmx.de>
To: linux-parisc@vger.kernel.org,
James Bottomley <James.Bottomley@hansenpartnership.com>,
John David Anglin <dave.anglin@bell.net>
Subject: [PATCH] parisc: Add arch_trigger_cpumask_backtrace() function
Date: Wed, 19 Feb 2020 15:09:38 +0100 [thread overview]
Message-ID: <20200219140938.GA27510@ls3530.fritz.box> (raw)
Implement the parisc version for the arch_trigger_cpumask_backtrace()
function to provide IPI-triggered per-CPU backtrace printouts.
Signed-off-by: Helge Deller <deller@gmx.de>
diff --git a/arch/parisc/include/asm/irq.h b/arch/parisc/include/asm/irq.h
index 959e79cd2c14..c978d50bd29e 100644
--- a/arch/parisc/include/asm/irq.h
+++ b/arch/parisc/include/asm/irq.h
@@ -50,4 +50,10 @@ extern int cpu_check_affinity(struct irq_data *d, const struct cpumask *dest);
/* soft power switch support (power.c) */
extern struct tasklet_struct power_tasklet;
+#ifdef CONFIG_SMP
+extern void arch_trigger_cpumask_backtrace(const cpumask_t *mask,
+ bool exclude_self);
+#define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
+#endif
+
#endif /* _ASM_PARISC_IRQ_H */
diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index e202c37e56af..7cdbe98c26a8 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -29,6 +29,7 @@
#include <linux/bitops.h>
#include <linux/ftrace.h>
#include <linux/cpu.h>
+#include <linux/nmi.h>
#include <linux/atomic.h>
#include <asm/current.h>
@@ -71,7 +72,8 @@ enum ipi_message_type {
IPI_CALL_FUNC,
IPI_CPU_START,
IPI_CPU_STOP,
- IPI_CPU_TEST
+ IPI_CPU_TEST,
+ IPI_CPU_BACKTRACE
};
@@ -170,6 +172,14 @@ ipi_interrupt(int irq, void *dev_id)
smp_debug(100, KERN_DEBUG "CPU%d is alive!\n", this_cpu);
break;
+ case IPI_CPU_BACKTRACE:
+ printk_nmi_enter();
+ irq_enter();
+ nmi_cpu_backtrace(get_irq_regs());
+ irq_exit();
+ printk_nmi_exit();
+ break;
+
default:
printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n",
this_cpu, which);
@@ -248,6 +258,16 @@ void arch_send_call_function_single_ipi(int cpu)
send_IPI_single(cpu, IPI_CALL_FUNC);
}
+static void raise_nmi(cpumask_t *mask)
+{
+ send_IPI_mask(mask, IPI_CPU_BACKTRACE);
+}
+
+void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self)
+{
+ nmi_trigger_cpumask_backtrace(mask, exclude_self, raise_nmi);
+}
+
/*
* Called by secondaries to update state and initialize CPU registers.
*/
next reply other threads:[~2020-02-19 14:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-19 14:09 Helge Deller [this message]
2020-08-13 8:19 ` [PATCH v2] parisc: Add raise_nmi() and arch_trigger_cpumask_backtrace() Helge Deller
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