On 08/11/2019 08:56, Chris Wilson wrote:
We want to avoid taking forcewake when querying the performance stats,
as we wish to avoid perturbing the system under observation. (And with
the forcewake being kept alive for 1ms after use, sampling the frequency
from a timer keeps forcewake 60% active.)
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_pmu.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index 05395015d1f2..dbde80a376cb 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -366,8 +366,12 @@ frequency_sample(struct intel_gt *gt, unsigned int period_ns)
val = rps->cur_freq;
if (intel_gt_pm_get_if_awake(gt)) {
- val = intel_uncore_read_notrace(uncore, GEN6_RPSTAT1);
- val = intel_get_cagf(rps, val);
+ u32 stat;
+
+ stat = intel_uncore_read_fw(uncore, GEN6_RPSTAT1);
+ if (stat)
+ val = intel_get_cagf(rps, stat);
+
intel_gt_pm_put(gt);
}
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
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