On 02/25/13 05:40, Mark Rutland wrote:
> I've had a quick go at writing a generic timer driver. I've not had a chance to
> test it, and there are a couple of things that are up for discussion (e.g. what
> should the rating be) but I think we want something very close to this.
>
This looks good to me. I only have some minor comments. What's the plan
for merging? Get tglx to take this and provide a stable branch and then
base my patches off that and get these patches taken through arm-soc?
> diff --git a/drivers/clocksource/dummy_timer.c b/drivers/clocksource/dummy_timer.c
> new file mode 100644
> index 0000000..bdaba34
> --- /dev/null
> +++ b/drivers/clocksource/dummy_timer.c
> @@ -0,0 +1,67 @@
> +/*
> + * linux/drivers/clocksource/dummy_timer.c
> + *
> + * Copyright (C) 2013 ARM Ltd.
> + * All Rights Reserved
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +#include <linux/clockchips.h>
> +#include <linux/cpu.h>
> +#include <linux/init.h>
> +#include <linux/percpu.h>
> +
> +DEFINE_PER_CPU(struct clock_event_device, dummy_evt);
static?
> +
> +static void dummy_set_mode(enum clock_event_mode mode,
> + struct clock_event_device *evt)
> +{
> + /*
> + * Core clockevents code will call this when exchanging timer devices.
> + * We don't need to do anything here.
> + */
> +}
> +
> +static void __cpuinit dummy_setup(void)
> +{
> + int cpu = smp_processor_id();
> + struct clock_event_device *evt = &per_cpu(dummy_evt, cpu);
Can we use __this_cpu_ptr()? I wonder if that makes the code generation
better or worse. I didn't do it in my 8/8 patch because I wanted the
code to be the same before and after to show code movement.
> +
> + evt->name = "dummy timer";
> + evt->features = CLOCK_EVT_FEAT_PERIODIC |
> + CLOCK_EVT_FEAT_ONESHOT |
> + CLOCK_EVT_FEAT_DUMMY;
> + evt->rating = 100;
> + evt->set_mode = dummy_set_mode;
> + evt->cpumask = cpumask_of(cpu);
> +
> + clockevents_register_device(evt);
> +}
> +
> +static int __cpuinit dummy_cpu_notify(struct notifier_block *self,
> + unsigned long action, void *hcpu)
> +{
> + if ((action & ~CPU_TASKS_FROZEN) == CPU_STARTING)
> + dummy_setup();
There are already two dummy_setup() functions. Perhaps we can
s/dummy/dummy_broadcast/ throughout this file?
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