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drm/i915/pmu: Only enumerate available counters in sysfs

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Switch over to dynamically creating device attributes, which are in turn
used by the perf core to expose available counters in sysfs.

This way we do not expose counters which are not avaiable on the current
platform, and are so more consistent between what we reply to open
attempts via the perf_event_open(2), and what is discoverable in sysfs.

v2:
 * Simplify attribute pointer freeing loop.
 * Changed attr init from macro to function.
 * More common error unwind. (Chris Wilson)
 * Rename some locals. (Chris Wilson)

v3:
 * Fixed double semi-colon. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180111083525.32394-1-tvrtko.ursulin@linux.intel.com
This commit is contained in:
Tvrtko Ursulin
2018-01-11 08:35:25 +00:00
parent 6e7a3f5244
commit 109ec55837
2 changed files with 252 additions and 79 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpu/drm/i915/i915_pmu.h
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@@ -94,6 +94,14 @@ struct i915_pmu {
* struct intel_engine_cs.
*/
struct i915_pmu_sample sample[__I915_NUM_PMU_SAMPLERS];
/**
* @i915_attr: Memory block holding device attributes.
*/
void *i915_attr;
/**
* @pmu_attr: Memory block holding device attributes.
*/
void *pmu_attr;
};
#ifdef CONFIG_PERF_EVENTS