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drm/i915/gt: Drop atomic for engine->fw_active tracking
Since schedule-in/out is now entirely serialised by the tasklet bitlock, we do not need to worry about concurrent in/out operations and so reduce the atomic operations to plain instructions. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Andi Shyti <andi.shyti@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210115142331.24458-1-chris@chris-wilson.co.uk
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@ -1676,7 +1676,7 @@ void intel_engine_dump(struct intel_engine_cs *engine,
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ktime_to_ms(intel_engine_get_busy_time(engine,
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&dummy)));
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drm_printf(m, "\tForcewake: %x domains, %d active\n",
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engine->fw_domain, atomic_read(&engine->fw_active));
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engine->fw_domain, READ_ONCE(engine->fw_active));
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rcu_read_lock();
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rq = READ_ONCE(engine->heartbeat.systole);
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@ -319,7 +319,7 @@ struct intel_engine_cs {
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* as possible.
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*/
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enum forcewake_domains fw_domain;
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atomic_t fw_active;
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unsigned int fw_active;
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unsigned long context_tag;
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@ -538,7 +538,7 @@ __execlists_schedule_in(struct i915_request *rq)
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ce->lrc.ccid |= engine->execlists.ccid;
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__intel_gt_pm_get(engine->gt);
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if (engine->fw_domain && !atomic_fetch_inc(&engine->fw_active))
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if (engine->fw_domain && !engine->fw_active++)
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intel_uncore_forcewake_get(engine->uncore, engine->fw_domain);
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execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_IN);
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intel_engine_context_in(engine);
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@ -645,7 +645,7 @@ static void __execlists_schedule_out(struct i915_request * const rq,
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lrc_update_runtime(ce);
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intel_engine_context_out(engine);
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execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_OUT);
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if (engine->fw_domain && !atomic_dec_return(&engine->fw_active))
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if (engine->fw_domain && !--engine->fw_active)
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intel_uncore_forcewake_put(engine->uncore, engine->fw_domain);
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intel_gt_pm_put_async(engine->gt);
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