On Fri, Apr 20, 2018 at 11:23:06AM +0100, Matt Redfearn wrote:
> diff --git a/arch/mips/kernel/perf_event_mipsxx.c b/arch/mips/kernel/perf_event_mipsxx.c
> index 7e2b7d38a774..fe50986e83c6 100644
> --- a/arch/mips/kernel/perf_event_mipsxx.c
> +++ b/arch/mips/kernel/perf_event_mipsxx.c
> @@ -323,7 +323,11 @@ static int mipsxx_pmu_alloc_counter(struct cpu_hw_events *cpuc,
>
> static void mipsxx_pmu_enable_event(struct hw_perf_event *evt, int idx)
> {
> + struct perf_event *event = container_of(evt, struct perf_event, hw);
> struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
> +#ifdef CONFIG_MIPS_MT_SMP
> + unsigned int range = evt->event_base >> 24;
> +#endif /* CONFIG_MIPS_MT_SMP */
>
> WARN_ON(idx < 0 || idx >= mipspmu.num_counters);
>
> @@ -331,11 +335,37 @@ static void mipsxx_pmu_enable_event(struct hw_perf_event *evt, int idx)
> (evt->config_base & M_PERFCTL_CONFIG_MASK) |
> /* Make sure interrupt enabled. */
> MIPS_PERFCTRL_IE;
> - if (IS_ENABLED(CONFIG_CPU_BMIPS5000))
> +
> +#ifdef CONFIG_CPU_BMIPS5000
> + {
> /* enable the counter for the calling thread */
> cpuc->saved_ctrl[idx] |=
> (1 << (12 + vpe_id())) | BRCM_PERFCTRL_TC;
> + }
> +#else
> +#ifdef CONFIG_MIPS_MT_SMP
> + if (range > V) {
> + /* The counter is processor wide. Set it up to count all TCs. */
> + pr_debug("Enabling perf counter for all TCs\n");
> + cpuc->saved_ctrl[idx] |= M_TC_EN_ALL;
> + } else
> +#endif /* CONFIG_MIPS_MT_SMP */
> + {
> + unsigned int cpu, ctrl;
>
> + /*
> + * Set up the counter for a particular CPU when event->cpu is
> + * a valid CPU number. Otherwise set up the counter for the CPU
> + * scheduling this thread.
> + */
> + cpu = (event->cpu >= 0) ? event->cpu : smp_processor_id();
> +
> + ctrl = M_PERFCTL_VPEID(cpu_vpe_id(&cpu_data[cpu]));
> + ctrl |= M_TC_EN_VPE;
> + cpuc->saved_ctrl[idx] |= ctrl;
> + pr_debug("Enabling perf counter for CPU%d\n", cpu);
> + }
> +#endif /* CONFIG_CPU_BMIPS5000 */
I'm not a huge fan of the ifdefery tbh, I don't think it makes it very
easy to read having a combination of ifs and #ifdefs. I reckon
IF_ENABLED would be better, perhaps with having the BMIPS5000 case
return to avoid too much nesting.
Otherwise the patch looks okay to me.
Thanks
James
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