linux-kernel - Re: [PATCH 5/6] MIPS: perf: Add support for 64-bit perf counters.

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Date:	Thu, 20 Jan 2011 18:06:28 +0800
From:	Deng-Cheng Zhu <dengcheng.zhu@...il.com>
To:	David Daney <ddaney@...iumnetworks.com>
Cc:	linux-mips@...ux-mips.org, ralf@...ux-mips.org,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 5/6] MIPS: perf: Add support for 64-bit perf counters.

2011/1/7 David Daney <ddaney@...iumnetworks.com>:
> @@ -294,14 +519,29 @@ static void mipspmu_read(struct perf_event *event)
>
>  static void mipspmu_enable(struct pmu *pmu)
>  {
> -       if (mipspmu)
> -               mipspmu->start();
> +#ifdef CONFIG_MIPS_MT_SMP
> +       write_unlock(&pmuint_rwlock);
> +#endif
> +       resume_local_counters();
>  }

When working with CONFIG_MIPS_MT_SMP, the compiler says 'pmuint_rwlock
undeclared' because of its improper place of definition.


> @@ -1550,10 +1462,30 @@ init_hw_perf_events(void)
>                return -ENODEV;
>        }
>
> -       if (mipspmu)
> -               pr_cont("%s PMU enabled, %d counters available to each "
> -                       "CPU, irq %d%s\n", mipspmu->name, counters, irq,
> -                       irq < 0 ? " (share with timer interrupt)" : "");
> +       mipspmu.num_counters = counters;
> +       mipspmu.irq = irq;
> +
> +       if (read_c0_perfctrl0() & M_PERFCTL_WIDE) {
> +               mipspmu.max_period = (1ULL << 63) - 1;
> +               mipspmu.valid_count = (1ULL << 63) - 1;
> +               mipspmu.overflow = 1ULL << 63;
> +               mipspmu.read_counter = mipsxx_pmu_read_counter_64;
> +               mipspmu.write_counter = mipsxx_pmu_write_counter_64;
> +               counter_bits = 64;
> +       } else {
> +               mipspmu.max_period = (1ULL << 32) - 1;
> +               mipspmu.valid_count = (1ULL << 31) - 1;
> +               mipspmu.overflow = 1ULL << 31;
> +               mipspmu.read_counter = mipsxx_pmu_read_counter;
> +               mipspmu.write_counter = mipsxx_pmu_write_counter;
> +               counter_bits = 32;
> +       }
> +
> +       on_each_cpu(reset_counters, (void *)(long)counters, 1);
> +
> +       pr_cont("%s PMU enabled, %d %d-bit counters available to each "
> +               "CPU, irq %d%s\n", mipspmu.name, counters, counter_bits, irq,
> +               irq < 0 ? " (share with timer interrupt)" : "");
>
>        perf_pmu_register(&pmu);
>

perf_pmu_register(&pmu) should be now changed to perf_pmu_register(&pmu,
"cpu", PERF_TYPE_RAW).


Deng-Cheng
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