diff options
| author | Richard Cochran <rcochran@linutronix.de> | 2016-07-13 20:16:44 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-07-15 11:40:26 +0300 |
| commit | 2dab90932fd08f101a45acc0495ccd77b869da5d (patch) | |
| tree | 781a2dd0aec4471ef5c9bc04612dd870751ef40d /drivers/clocksource/mips-gic-timer.c | |
| parent | b04041655d0cf84b77802cb0b4517e672df04f01 (diff) | |
| download | linux-2dab90932fd08f101a45acc0495ccd77b869da5d.tar.xz | |
clocksource/mips-gic: Convert to hotplug state machine
Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs.
Signed-off-by: Richard Cochran <rcochran@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153336.380737946@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/clocksource/mips-gic-timer.c')
| -rw-r--r-- | drivers/clocksource/mips-gic-timer.c | 38 |
1 files changed, 13 insertions, 25 deletions
diff --git a/drivers/clocksource/mips-gic-timer.c b/drivers/clocksource/mips-gic-timer.c index 1572c7a778ab..d91e8725917c 100644 --- a/drivers/clocksource/mips-gic-timer.c +++ b/drivers/clocksource/mips-gic-timer.c @@ -49,10 +49,9 @@ struct irqaction gic_compare_irqaction = { .name = "timer", }; -static void gic_clockevent_cpu_init(struct clock_event_device *cd) +static void gic_clockevent_cpu_init(unsigned int cpu, + struct clock_event_device *cd) { - unsigned int cpu = smp_processor_id(); - cd->name = "MIPS GIC"; cd->features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_C3STOP; @@ -79,19 +78,10 @@ static void gic_update_frequency(void *data) clockevents_update_freq(this_cpu_ptr(&gic_clockevent_device), rate); } -static int gic_cpu_notifier(struct notifier_block *nb, unsigned long action, - void *data) +static int gic_starting_cpu(unsigned int cpu) { - switch (action & ~CPU_TASKS_FROZEN) { - case CPU_STARTING: - gic_clockevent_cpu_init(this_cpu_ptr(&gic_clockevent_device)); - break; - case CPU_DYING: - gic_clockevent_cpu_exit(this_cpu_ptr(&gic_clockevent_device)); - break; - } - - return NOTIFY_OK; + gic_clockevent_cpu_init(cpu, this_cpu_ptr(&gic_clockevent_device)); + return 0; } static int gic_clk_notifier(struct notifier_block *nb, unsigned long action, @@ -105,10 +95,11 @@ static int gic_clk_notifier(struct notifier_block *nb, unsigned long action, return NOTIFY_OK; } - -static struct notifier_block gic_cpu_nb = { - .notifier_call = gic_cpu_notifier, -}; +static int gic_dying_cpu(unsigned int cpu) +{ + gic_clockevent_cpu_exit(this_cpu_ptr(&gic_clockevent_device)); + return 0; +} static struct notifier_block gic_clk_nb = { .notifier_call = gic_clk_notifier, @@ -125,12 +116,9 @@ static int gic_clockevent_init(void) if (ret < 0) return ret; - ret = register_cpu_notifier(&gic_cpu_nb); - if (ret < 0) - pr_warn("GIC: Unable to register CPU notifier\n"); - - gic_clockevent_cpu_init(this_cpu_ptr(&gic_clockevent_device)); - + cpuhp_setup_state(CPUHP_AP_MIPS_GIC_TIMER_STARTING, + "AP_MIPS_GIC_TIMER_STARTING", gic_starting_cpu, + gic_dying_cpu); return 0; } |