linux-kernel - Re: [RFC] x86,perf: Implement minimal P4 PMU driver v14

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Date:	Thu, 11 Mar 2010 07:12:52 +0300
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	Robert Richter <robert.richter@....com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] x86,perf: Implement minimal P4 PMU driver v14

On 3/11/10, Lin Ming <ming.m.lin@...el.com> wrote:
> On Thu, 2010-03-11 at 02:31 +0800, Cyrill Gorcunov wrote:
>> +static __initconst struct x86_pmu p4_pmu = {
>> +       .name                   = "Netburst P4/Xeon",
>> +       .handle_irq             = p4_pmu_handle_irq,
>> +       .disable_all            = p4_pmu_disable_all,
>> +       .enable_all             = p4_pmu_enable_all,
>> +       .enable                 = p4_pmu_enable_event,
>> +       .disable                = p4_pmu_disable_event,
>> +       .eventsel               = MSR_P4_BPU_CCCR0,
>> +       .perfctr                = MSR_P4_BPU_PERFCTR0,
>> +       .event_map              = p4_pmu_event_map,
>> +       .raw_event              = p4_pmu_raw_event,
>> +       .max_events             = ARRAY_SIZE(p4_event_map),
>> +       /*
>> +        * IF HT disabled we may need to use all
>> +        * ARCH_P4_MAX_CCCR counters simulaneously
>> +        * though leave it restricted at moment assuming
>> +        * HT is on
>> +        */
>> +       .num_events             = ARCH_P4_MAX_CCCR,
>> +       .apic                   = 1,
>> +       .event_bits             = 40,
>> +       .event_mask             = (1ULL << 40) - 1,
>> +       .max_period             = (1ULL << 39) - 1,
>> +       .hw_config              = p4_hw_config,
>> +       .schedule_events        = p4_pmu_schedule_events,
>> +};
>
> commit ca03770(perf, x86: Add PEBS infrastructure) introduces a new
> function validate_event that calls x86_pmu.get_event_constraints.
>
> static int validate_event(struct perf_event *event)
> {
> 	...
> 	c = x86_pmu.get_event_constraints(fake_cpuc, event);
> 	...
> }
>
> So we need to add .get_event_constraints to p4_pmu.
>
> diff --git a/arch/x86/kernel/cpu/perf_event_p4.c
> b/arch/x86/kernel/cpu/perf_event_p4.c
> index 4eb79b1..99a2a7c 100644
> --- a/arch/x86/kernel/cpu/perf_event_p4.c
> +++ b/arch/x86/kernel/cpu/perf_event_p4.c
> @@ -586,6 +586,7 @@ static __initconst struct x86_pmu p4_pmu = {
>  	.max_period		= (1ULL << 39) - 1,
>  	.hw_config		= p4_hw_config,
>  	.schedule_events	= p4_pmu_schedule_events,
> +	.get_event_constraints  = x86_get_event_constraints,
>  };
>
>  static __init int p4_pmu_init(void)
>
> ---
> Lin Ming
>
>
>
Thanks, Ming! This snippet somehow escaped me. Will update.
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