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drm/i915/gt: Ignore dt==0 for reporting underflows

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The presumption was that some time would always elapse between recording
the start and the finish of a context switch. This turns out to be a
regular occurrence and emitting a debug statement superfluous.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201117113103.21480-4-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2020-11-17 11:30:39 +00:00
parent ac54c826cd
commit d33fcd798c
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/gt/intel_lrc.c
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@@ -1307,7 +1307,7 @@ static void reset_active(struct i915_request *rq,
static void st_update_runtime_underflow(struct intel_context *ce, s32 dt)
{
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
ce->runtime.num_underflow += dt < 0;
ce->runtime.num_underflow++;
ce->runtime.max_underflow = max_t(u32, ce->runtime.max_underflow, -dt);
#endif
}
@@ -1324,7 +1324,7 @@ static void intel_context_update_runtime(struct intel_context *ce)
ce->runtime.last = intel_context_get_runtime(ce);
dt = ce->runtime.last - old;
if (unlikely(dt <= 0)) {
if (unlikely(dt < 0)) {
CE_TRACE(ce, "runtime underflow: last=%u, new=%u, delta=%d\n",
old, ce->runtime.last, dt);
st_update_runtime_underflow(ce, dt);