diff options
| author | Sven Schnelle <svens@stackframe.org> | 2021-10-15 21:49:23 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-26 11:58:38 +0100 |
| commit | dfe4a722a19d9b74af3b2c8ebb9a58f69c6d0b0e (patch) | |
| tree | cbdce1438aa15c27df44f5292964911a69539229 /arch | |
| parent | 2a4b6e778c74b200d461f45c4cbd370eebb6ff35 (diff) | |
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: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/parisc/kernel/smp.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c index 52e85973a283..5a2c4771e9d1 100644 --- a/arch/parisc/kernel/smp.c +++ b/arch/parisc/kernel/smp.c @@ -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); } |