drm/i915/pmu: Avoid with_intel_runtime_pm within spinlock

When guc timestamp ping worker runs it takes the spinlock and calls
with_intel_runtime_pm.  Since with_intel_runtime_pm may sleep, move the
spinlock inside __update_guc_busyness_stats.

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211120014201.26480-1-umesh.nerlige.ramappa@intel.com

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index 77fbcd8..a7108b3 100644 (file)
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1251,12 +1251,15 @@ static void __update_guc_busyness_stats(struct intel_guc *guc)
        struct intel_gt *gt = guc_to_gt(guc);
        struct intel_engine_cs *engine;
        enum intel_engine_id id;
+       unsigned long flags;
        ktime_t unused;
 
+       spin_lock_irqsave(&guc->timestamp.lock, flags);
        for_each_engine(engine, gt, id) {
                guc_update_pm_timestamp(guc, engine, &unused);
                guc_update_engine_gt_clks(engine);
        }
+       spin_unlock_irqrestore(&guc->timestamp.lock, flags);
 }
 
 static void guc_timestamp_ping(struct work_struct *wrk)
@@ -1266,7 +1269,6 @@ static void guc_timestamp_ping(struct work_struct *wrk)
        struct intel_uc *uc = container_of(guc, typeof(*uc), guc);
        struct intel_gt *gt = guc_to_gt(guc);
        intel_wakeref_t wakeref;
-       unsigned long flags;
        int srcu, ret;
 
        /*
@@ -1277,13 +1279,9 @@ static void guc_timestamp_ping(struct work_struct *wrk)
        if (ret)
                return;
 
-       spin_lock_irqsave(&guc->timestamp.lock, flags);
-
        with_intel_runtime_pm(&gt->i915->runtime_pm, wakeref)
                __update_guc_busyness_stats(guc);
 
-       spin_unlock_irqrestore(&guc->timestamp.lock, flags);
-
        intel_gt_reset_unlock(gt, srcu);
 
        mod_delayed_work(system_highpri_wq, &guc->timestamp.work,
@@ -1322,16 +1320,12 @@ static void guc_init_engine_stats(struct intel_guc *guc)
 void intel_guc_busyness_park(struct intel_gt *gt)
 {
        struct intel_guc *guc = &gt->uc.guc;
-       unsigned long flags;
 
        if (!guc_submission_initialized(guc))
                return;
 
        cancel_delayed_work(&guc->timestamp.work);
-
-       spin_lock_irqsave(&guc->timestamp.lock, flags);
        __update_guc_busyness_stats(guc);
-       spin_unlock_irqrestore(&guc->timestamp.lock, flags);
 }
 
 void intel_guc_busyness_unpark(struct intel_gt *gt)