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Commit 00746621 authored by Sven Schnelle's avatar Sven Schnelle Committed by Greg Kroah-Hartman
Browse files

parisc/kgdb: add kgdb_roundup() to make kgdb work with idle polling 



[ Upstream commit 66e29fcda1824f0427966fbee2bd2c85bf362c82 ]

With idle polling, IPIs are not sent when a CPU idle, but queued
and run later from do_idle(). The default kgdb_call_nmi_hook()
implementation gets the pointer to struct pt_regs from get_irq_reqs(),
which doesn't work in that case because it was not called from the
IPI interrupt handler. Fix it by defining our own kgdb_roundup()
function which sents an IPI_ENTER_KGDB. When that IPI is received
on the target CPU kgdb_nmicallback() is called.

Signed-off-by: default avatarSven Schnelle <svens@stackframe.org>
Signed-off-by: default avatarHelge Deller <deller@gmx.de>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 4847dcb4

arch/parisc/kernel/smp.c

+17 −2
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ 
#include <linux/bitops.h>

#include <linux/ftrace.h>

#include <linux/cpu.h>

#include <linux/kgdb.h>



#include <linux/atomic.h>

#include <asm/current.h>
@@ -74,7 +75,10 @@ enum ipi_message_type { 
	IPI_CALL_FUNC,

	IPI_CPU_START,

	IPI_CPU_STOP,

	IPI_CPU_TEST

	IPI_CPU_TEST,

#ifdef CONFIG_KGDB

	IPI_ENTER_KGDB,

#endif

};
@@ -170,7 +174,12 @@ ipi_interrupt(int irq, void *dev_id) 
			case IPI_CPU_TEST:

				smp_debug(100, KERN_DEBUG "CPU%d is alive!\n", this_cpu);

				break;



#ifdef CONFIG_KGDB

			case IPI_ENTER_KGDB:

				smp_debug(100, KERN_DEBUG "CPU%d ENTER_KGDB\n", this_cpu);

				kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());

				break;

#endif

			default:

				printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n",

					this_cpu, which);
@@ -226,6 +235,12 @@ send_IPI_allbutself(enum ipi_message_type op) 
	}

}



#ifdef CONFIG_KGDB

void kgdb_roundup_cpus(void)

{

	send_IPI_allbutself(IPI_ENTER_KGDB);

}

#endif



inline void 

smp_send_stop(void)	{ send_IPI_allbutself(IPI_CPU_STOP); }