[Intel-gfx] [PATCH] drm/i915/pmu: Do not use colon characters in PMU names

[Chris Wilson]

Quoting Tvrtko Ursulin (2020-01-10 11:11:26)
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> We use PCI device path in the registered PMU name in order to distinguish
> between multiple GPUs. But since tools/perf reserves a special meaning to
> the colon character we need to transliterate them to something else. We
> choose a dash.
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Reported-by: Dmitry Rogozhkin <dmitry.v.rogozhkin at intel.com>
> Fixes: 05488673a4d4 ("drm/i915/pmu: Support multiple GPUs")
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
> Cc: Andi Kleen <ak at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/i915_pmu.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
> index f3ef6700a5f2..ecbd0e1f1a90 100644
> --- a/drivers/gpu/drm/i915/i915_pmu.c
> +++ b/drivers/gpu/drm/i915/i915_pmu.c
> @@ -1117,12 +1117,22 @@ void i915_pmu_register(struct drm_i915_private *i915)
>         hrtimer_init(&pmu->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
>         pmu->timer.function = i915_sample;
>  
> -       if (!is_igp(i915))
> +       if (!is_igp(i915)) {
>                 pmu->name = kasprintf(GFP_KERNEL,
>                                       "i915-%s",
>                                       dev_name(i915->drm.dev));
> -       else
> +               if (pmu->name) {

/* tools/perf reserves colons as special. */
strreplace(pmu->name, ':', '-');

I worry because the err_idx pointed to the '-'. We may have to use _
-Chris