drm/i915/pmu: Do not use colons or dashes in PMU names

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
dash and colon characters we need to transliterate them to something else.
We choose an underscore.

v2:
 * Use strreplace. (Chris)
 * Dashes are not good either. (Chris)

Signed-off-by: Tvrtko Ursulin <[email protected]>
Reported-by: Dmitry Rogozhkin <[email protected]>
Fixes: 0548867 ("drm/i915/pmu: Support multiple GPUs")
Cc: Chris Wilson <[email protected]>
Cc: Michal Wajdeczko <[email protected]>
Cc: Andi Kleen <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit aebf3b5)
Signed-off-by: Joonas Lahtinen <[email protected]>

Author: tursulin

drivers/gpu/drm/i915/i915_pmu.c

@@ -1074,12 +1074,17 @@ 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",
+				      "i915_%s",
 				      dev_name(i915->drm.dev));
-	else
+		if (pmu->name) {
+			/* tools/perf reserves colons as special. */
+			strreplace((char *)pmu->name, ':', '_');
+		}
+	} else {
 		pmu->name = "i915";
+	}
 	if (!pmu->name)
 		goto err;