drm/i915: add a dedicated workqueue inside drm_i915_private

In order to avoid flush_scheduled_work() usage, add a dedicated
workqueue in the drm_i915_private structure.  In this way, we don't
need to use the system queue anymore.

This change is mostly mechanical and based on Tetsuo's original
patch[1].

v6 by Jani:
- Also create unordered_wq for mock device

Link: https://patchwork.freedesktop.org/series/114608/ [1]
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/c816ebe17ef08d363981942a096a586a7658a65e.1686231190.git.jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_display.c

@@ -7180,11 +7180,12 @@ intel_atomic_commit_ready(struct i915_sw_fence *fence,
 		break;
 	case FENCE_FREE:
 		{
+			struct drm_i915_private *i915 = to_i915(state->base.dev);
 			struct intel_atomic_helper *helper =
-				&to_i915(state->base.dev)->display.atomic_helper;
+				&i915->display.atomic_helper;
 
 			if (llist_add(&state->freed, &helper->free_list))
-				schedule_work(&helper->free_work);
+				queue_work(i915->unordered_wq, &helper->free_work);
 			break;
 		}
 	}

drivers/gpu/drm/i915/display/intel_display_driver.c

@@ -442,7 +442,7 @@ void intel_display_driver_remove_noirq(struct drm_i915_private *i915)
 	intel_unregister_dsm_handler();
 
 	/* flush any delayed tasks or pending work */
-	flush_scheduled_work();
+	flush_workqueue(i915->unordered_wq);
 
 	intel_hdcp_component_fini(i915);
 

drivers/gpu/drm/i915/display/intel_dmc.c

@@ -1057,7 +1057,7 @@ void intel_dmc_init(struct drm_i915_private *i915)
 	i915->display.dmc.dmc = dmc;
 
 	drm_dbg_kms(&i915->drm, "Loading %s\n", dmc->fw_path);
-	schedule_work(&dmc->work);
+	queue_work(i915->unordered_wq, &dmc->work);
 
 	return;
 

drivers/gpu/drm/i915/display/intel_dp.c

@@ -5251,7 +5251,7 @@ static void intel_dp_oob_hotplug_event(struct drm_connector *connector)
 	spin_lock_irq(&i915->irq_lock);
 	i915->display.hotplug.event_bits |= BIT(encoder->hpd_pin);
 	spin_unlock_irq(&i915->irq_lock);
-	queue_delayed_work(system_wq, &i915->display.hotplug.hotplug_work, 0);
+	queue_delayed_work(i915->unordered_wq, &i915->display.hotplug.hotplug_work, 0);
 }
 
 static const struct drm_connector_funcs intel_dp_connector_funcs = {

drivers/gpu/drm/i915/display/intel_dp_link_training.c

@@ -1064,6 +1064,7 @@ static void intel_dp_schedule_fallback_link_training(struct intel_dp *intel_dp,
 						     const struct intel_crtc_state *crtc_state)
 {
 	struct intel_connector *intel_connector = intel_dp->attached_connector;
+	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 
 	if (!intel_digital_port_connected(&dp_to_dig_port(intel_dp)->base)) {
 		lt_dbg(intel_dp, DP_PHY_DPRX, "Link Training failed on disconnected sink.\n");
@@ -1081,7 +1082,7 @@ static void intel_dp_schedule_fallback_link_training(struct intel_dp *intel_dp,
 	}
 
 	/* Schedule a Hotplug Uevent to userspace to start modeset */
-	schedule_work(&intel_connector->modeset_retry_work);
+	queue_work(i915->unordered_wq, &intel_connector->modeset_retry_work);
 }
 
 /* Perform the link training on all LTTPRs and the DPRX on a link. */

drivers/gpu/drm/i915/display/intel_drrs.c

@@ -111,7 +111,9 @@ static void intel_drrs_set_state(struct intel_crtc *crtc,
 
 static void intel_drrs_schedule_work(struct intel_crtc *crtc)
 {
-	mod_delayed_work(system_wq, &crtc->drrs.work, msecs_to_jiffies(1000));
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+
+	mod_delayed_work(i915->unordered_wq, &crtc->drrs.work, msecs_to_jiffies(1000));
 }
 
 static unsigned int intel_drrs_frontbuffer_bits(const struct intel_crtc_state *crtc_state)

drivers/gpu/drm/i915/display/intel_fbc.c

@@ -1600,7 +1600,7 @@ static void __intel_fbc_handle_fifo_underrun_irq(struct intel_fbc *fbc)
 	if (READ_ONCE(fbc->underrun_detected))
 		return;
 
-	schedule_work(&fbc->underrun_work);
+	queue_work(fbc->i915->unordered_wq, &fbc->underrun_work);
 }
 
 /**

drivers/gpu/drm/i915/display/intel_fbdev.c

@@ -694,7 +694,8 @@ void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous
 			/* Don't block our own workqueue as this can
 			 * be run in parallel with other i915.ko tasks.
 			 */
-			schedule_work(&dev_priv->display.fbdev.suspend_work);
+			queue_work(dev_priv->unordered_wq,
+				   &dev_priv->display.fbdev.suspend_work);
 			return;
 		}
 	}

drivers/gpu/drm/i915/display/intel_hdcp.c

@@ -983,6 +983,7 @@ static void intel_hdcp_update_value(struct intel_connector *connector,
 	struct drm_device *dev = connector->base.dev;
 	struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
 	struct intel_hdcp *hdcp = &connector->hdcp;
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
 
 	drm_WARN_ON(connector->base.dev, !mutex_is_locked(&hdcp->mutex));
 
@@ -1001,7 +1002,7 @@ static void intel_hdcp_update_value(struct intel_connector *connector,
 	hdcp->value = value;
 	if (update_property) {
 		drm_connector_get(&connector->base);
-		schedule_work(&hdcp->prop_work);
+		queue_work(i915->unordered_wq, &hdcp->prop_work);
 	}
 }
 
@@ -2090,16 +2091,17 @@ static void intel_hdcp_check_work(struct work_struct *work)
 					       struct intel_hdcp,
 					       check_work);
 	struct intel_connector *connector = intel_hdcp_to_connector(hdcp);
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
 
 	if (drm_connector_is_unregistered(&connector->base))
 		return;
 
 	if (!intel_hdcp2_check_link(connector))
-		schedule_delayed_work(&hdcp->check_work,
-				      DRM_HDCP2_CHECK_PERIOD_MS);
+		queue_delayed_work(i915->unordered_wq, &hdcp->check_work,
+				   DRM_HDCP2_CHECK_PERIOD_MS);
 	else if (!intel_hdcp_check_link(connector))
-		schedule_delayed_work(&hdcp->check_work,
-				      DRM_HDCP_CHECK_PERIOD_MS);
+		queue_delayed_work(i915->unordered_wq, &hdcp->check_work,
+				   DRM_HDCP_CHECK_PERIOD_MS);
 }
 
 static int i915_hdcp_component_bind(struct device *i915_kdev,
@@ -2398,7 +2400,8 @@ int intel_hdcp_enable(struct intel_atomic_state *state,
 	}
 
 	if (!ret) {
-		schedule_delayed_work(&hdcp->check_work, check_link_interval);
+		queue_delayed_work(i915->unordered_wq, &hdcp->check_work,
+				   check_link_interval);
 		intel_hdcp_update_value(connector,
 					DRM_MODE_CONTENT_PROTECTION_ENABLED,
 					true);
@@ -2447,6 +2450,7 @@ void intel_hdcp_update_pipe(struct intel_atomic_state *state,
 				to_intel_connector(conn_state->connector);
 	struct intel_hdcp *hdcp = &connector->hdcp;
 	bool content_protection_type_changed, desired_and_not_enabled = false;
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
 
 	if (!connector->hdcp.shim)
 		return;
@@ -2473,7 +2477,7 @@ void intel_hdcp_update_pipe(struct intel_atomic_state *state,
 		mutex_lock(&hdcp->mutex);
 		hdcp->value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
 		drm_connector_get(&connector->base);
-		schedule_work(&hdcp->prop_work);
+		queue_work(i915->unordered_wq, &hdcp->prop_work);
 		mutex_unlock(&hdcp->mutex);
 	}
 
@@ -2490,7 +2494,7 @@ void intel_hdcp_update_pipe(struct intel_atomic_state *state,
 		 */
 		if (!desired_and_not_enabled && !content_protection_type_changed) {
 			drm_connector_get(&connector->base);
-			schedule_work(&hdcp->prop_work);
+			queue_work(i915->unordered_wq, &hdcp->prop_work);
 		}
 	}
 
@@ -2602,6 +2606,7 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
 void intel_hdcp_handle_cp_irq(struct intel_connector *connector)
 {
 	struct intel_hdcp *hdcp = &connector->hdcp;
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
 
 	if (!hdcp->shim)
 		return;
@@ -2609,5 +2614,5 @@ void intel_hdcp_handle_cp_irq(struct intel_connector *connector)
 	atomic_inc(&connector->hdcp.cp_irq_count);
 	wake_up_all(&connector->hdcp.cp_irq_queue);
 
-	schedule_delayed_work(&hdcp->check_work, 0);
+	queue_delayed_work(i915->unordered_wq, &hdcp->check_work, 0);
 }

drivers/gpu/drm/i915/display/intel_hotplug.c

@@ -212,7 +212,8 @@ intel_hpd_irq_storm_switch_to_polling(struct drm_i915_private *dev_priv)
 	/* Enable polling and queue hotplug re-enabling. */
 	if (hpd_disabled) {
 		drm_kms_helper_poll_enable(&dev_priv->drm);
-		mod_delayed_work(system_wq, &dev_priv->display.hotplug.reenable_work,
+		mod_delayed_work(dev_priv->unordered_wq,
+				 &dev_priv->display.hotplug.reenable_work,
 				 msecs_to_jiffies(HPD_STORM_REENABLE_DELAY));
 	}
 }
@@ -339,7 +340,8 @@ static void i915_digport_work_func(struct work_struct *work)
 		spin_lock_irq(&dev_priv->irq_lock);
 		dev_priv->display.hotplug.event_bits |= old_bits;
 		spin_unlock_irq(&dev_priv->irq_lock);
-		queue_delayed_work(system_wq, &dev_priv->display.hotplug.hotplug_work, 0);
+		queue_delayed_work(dev_priv->unordered_wq,
+				   &dev_priv->display.hotplug.hotplug_work, 0);
 	}
 }
 
@@ -446,7 +448,8 @@ static void i915_hotplug_work_func(struct work_struct *work)
 		dev_priv->display.hotplug.retry_bits |= retry;
 		spin_unlock_irq(&dev_priv->irq_lock);
 
-		mod_delayed_work(system_wq, &dev_priv->display.hotplug.hotplug_work,
+		mod_delayed_work(dev_priv->unordered_wq,
+				 &dev_priv->display.hotplug.hotplug_work,
 				 msecs_to_jiffies(HPD_RETRY_DELAY));
 	}
 }
@@ -577,7 +580,8 @@ void intel_hpd_irq_handler(struct drm_i915_private *dev_priv,
 	if (queue_dig)
 		queue_work(dev_priv->display.hotplug.dp_wq, &dev_priv->display.hotplug.dig_port_work);
 	if (queue_hp)
-		queue_delayed_work(system_wq, &dev_priv->display.hotplug.hotplug_work, 0);
+		queue_delayed_work(dev_priv->unordered_wq,
+				   &dev_priv->display.hotplug.hotplug_work, 0);
 }
 
 /**
@@ -687,7 +691,8 @@ void intel_hpd_poll_enable(struct drm_i915_private *dev_priv)
 	 * As well, there's no issue if we race here since we always reschedule
 	 * this worker anyway
 	 */
-	schedule_work(&dev_priv->display.hotplug.poll_init_work);
+	queue_work(dev_priv->unordered_wq,
+		   &dev_priv->display.hotplug.poll_init_work);
 }
 
 /**
@@ -715,7 +720,8 @@ void intel_hpd_poll_disable(struct drm_i915_private *dev_priv)
 		return;
 
 	WRITE_ONCE(dev_priv->display.hotplug.poll_enabled, false);
-	schedule_work(&dev_priv->display.hotplug.poll_init_work);
+	queue_work(dev_priv->unordered_wq,
+		   &dev_priv->display.hotplug.poll_init_work);
 }
 
 void intel_hpd_init_early(struct drm_i915_private *i915)

drivers/gpu/drm/i915/display/intel_opregion.c

@@ -635,7 +635,8 @@ static void asle_work(struct work_struct *work)
 void intel_opregion_asle_intr(struct drm_i915_private *dev_priv)
 {
 	if (dev_priv->display.opregion.asle)
-		schedule_work(&dev_priv->display.opregion.asle_work);
+		queue_work(dev_priv->unordered_wq,
+			   &dev_priv->display.opregion.asle_work);
 }
 
 #define ACPI_EV_DISPLAY_SWITCH (1<<0)

drivers/gpu/drm/i915/display/intel_pps.c

@@ -867,6 +867,7 @@ static void edp_panel_vdd_work(struct work_struct *__work)
 
 static void edp_panel_vdd_schedule_off(struct intel_dp *intel_dp)
 {
+	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 	unsigned long delay;
 
 	/*
@@ -882,7 +883,8 @@ static void edp_panel_vdd_schedule_off(struct intel_dp *intel_dp)
 	 * operations.
 	 */
 	delay = msecs_to_jiffies(intel_dp->pps.panel_power_cycle_delay * 5);
-	schedule_delayed_work(&intel_dp->pps.panel_vdd_work, delay);
+	queue_delayed_work(i915->unordered_wq,
+			   &intel_dp->pps.panel_vdd_work, delay);
 }
 
 /*

drivers/gpu/drm/i915/display/intel_psr.c

@@ -341,7 +341,7 @@ void intel_psr_irq_handler(struct intel_dp *intel_dp, u32 psr_iir)
 		 */
 		intel_de_rmw(dev_priv, imr_reg, 0, psr_irq_psr_error_bit_get(intel_dp));
 
-		schedule_work(&intel_dp->psr.work);
+		queue_work(dev_priv->unordered_wq, &intel_dp->psr.work);
 	}
 }
 
@@ -2440,6 +2440,8 @@ static void
 tgl_dc3co_flush_locked(struct intel_dp *intel_dp, unsigned int frontbuffer_bits,
 		       enum fb_op_origin origin)
 {
+	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+
 	if (!intel_dp->psr.dc3co_exitline || !intel_dp->psr.psr2_enabled ||
 	    !intel_dp->psr.active)
 		return;
@@ -2453,7 +2455,7 @@ tgl_dc3co_flush_locked(struct intel_dp *intel_dp, unsigned int frontbuffer_bits,
 		return;
 
 	tgl_psr2_enable_dc3co(intel_dp);
-	mod_delayed_work(system_wq, &intel_dp->psr.dc3co_work,
+	mod_delayed_work(i915->unordered_wq, &intel_dp->psr.dc3co_work,
 			 intel_dp->psr.dc3co_exit_delay);
 }
 
@@ -2493,7 +2495,7 @@ static void _psr_flush_handle(struct intel_dp *intel_dp)
 		psr_force_hw_tracking_exit(intel_dp);
 
 		if (!intel_dp->psr.active && !intel_dp->psr.busy_frontbuffer_bits)
-			schedule_work(&intel_dp->psr.work);
+			queue_work(dev_priv->unordered_wq, &intel_dp->psr.work);
 	}
 }
 

drivers/gpu/drm/i915/gt/intel_execlists_submission.c

@@ -2327,6 +2327,7 @@ static u32 active_ccid(struct intel_engine_cs *engine)
 
 static void execlists_capture(struct intel_engine_cs *engine)
 {
+	struct drm_i915_private *i915 = engine->i915;
 	struct execlists_capture *cap;
 
 	if (!IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR))
@@ -2375,7 +2376,7 @@ static void execlists_capture(struct intel_engine_cs *engine)
 		goto err_rq;
 
 	INIT_WORK(&cap->work, execlists_capture_work);
-	schedule_work(&cap->work);
+	queue_work(i915->unordered_wq, &cap->work);
 	return;
 
 err_rq:
@@ -3680,7 +3681,7 @@ static void virtual_context_destroy(struct kref *kref)
 	 * lock, we can delegate the free of the engine to an RCU worker.
 	 */
 	INIT_RCU_WORK(&ve->rcu, rcu_virtual_context_destroy);
-	queue_rcu_work(system_wq, &ve->rcu);
+	queue_rcu_work(ve->context.engine->i915->unordered_wq, &ve->rcu);
 }
 
 static void virtual_engine_initial_hint(struct virtual_engine *ve)

drivers/gpu/drm/i915/gt/intel_gt_buffer_pool.c

@@ -88,10 +88,11 @@ static void pool_free_work(struct work_struct *wrk)
 {
 	struct intel_gt_buffer_pool *pool =
 		container_of(wrk, typeof(*pool), work.work);
+	struct intel_gt *gt = container_of(pool, struct intel_gt, buffer_pool);
 
 	if (pool_free_older_than(pool, HZ))
-		schedule_delayed_work(&pool->work,
-				      round_jiffies_up_relative(HZ));
+		queue_delayed_work(gt->i915->unordered_wq, &pool->work,
+				   round_jiffies_up_relative(HZ));
 }
 
 static void pool_retire(struct i915_active *ref)
@@ -99,6 +100,7 @@ static void pool_retire(struct i915_active *ref)
 	struct intel_gt_buffer_pool_node *node =
 		container_of(ref, typeof(*node), active);
 	struct intel_gt_buffer_pool *pool = node->pool;
+	struct intel_gt *gt = container_of(pool, struct intel_gt, buffer_pool);
 	struct list_head *list = bucket_for_size(pool, node->obj->base.size);
 	unsigned long flags;
 
@@ -116,8 +118,8 @@ static void pool_retire(struct i915_active *ref)
 	WRITE_ONCE(node->age, jiffies ?: 1); /* 0 reserved for active nodes */
 	spin_unlock_irqrestore(&pool->lock, flags);
 
-	schedule_delayed_work(&pool->work,
-			      round_jiffies_up_relative(HZ));
+	queue_delayed_work(gt->i915->unordered_wq, &pool->work,
+			   round_jiffies_up_relative(HZ));
 }
 
 void intel_gt_buffer_pool_mark_used(struct intel_gt_buffer_pool_node *node)

drivers/gpu/drm/i915/gt/intel_gt_irq.c

@@ -376,7 +376,7 @@ static void gen7_parity_error_irq_handler(struct intel_gt *gt, u32 iir)
 	if (iir & GT_RENDER_L3_PARITY_ERROR_INTERRUPT)
 		gt->i915->l3_parity.which_slice |= 1 << 0;
 
-	schedule_work(&gt->i915->l3_parity.error_work);
+	queue_work(gt->i915->unordered_wq, &gt->i915->l3_parity.error_work);
 }
 
 void gen6_gt_irq_handler(struct intel_gt *gt, u32 gt_iir)

drivers/gpu/drm/i915/gt/intel_gt_requests.c

@@ -116,7 +116,7 @@ void intel_engine_add_retire(struct intel_engine_cs *engine,
 	GEM_BUG_ON(intel_engine_is_virtual(engine));
 
 	if (add_retire(engine, tl))
-		schedule_work(&engine->retire_work);
+		queue_work(engine->i915->unordered_wq, &engine->retire_work);
 }
 
 void intel_engine_init_retire(struct intel_engine_cs *engine)
@@ -207,8 +207,8 @@ static void retire_work_handler(struct work_struct *work)
 	struct intel_gt *gt =
 		container_of(work, typeof(*gt), requests.retire_work.work);
 
-	schedule_delayed_work(&gt->requests.retire_work,
-			      round_jiffies_up_relative(HZ));
+	queue_delayed_work(gt->i915->unordered_wq, &gt->requests.retire_work,
+			   round_jiffies_up_relative(HZ));
 	intel_gt_retire_requests(gt);
 }
 
@@ -224,8 +224,8 @@ void intel_gt_park_requests(struct intel_gt *gt)
 
 void intel_gt_unpark_requests(struct intel_gt *gt)
 {
-	schedule_delayed_work(&gt->requests.retire_work,
-			      round_jiffies_up_relative(HZ));
+	queue_delayed_work(gt->i915->unordered_wq, &gt->requests.retire_work,
+			   round_jiffies_up_relative(HZ));
 }
 
 void intel_gt_fini_requests(struct intel_gt *gt)

drivers/gpu/drm/i915/gt/intel_reset.c

@@ -1625,7 +1625,7 @@ void __intel_init_wedge(struct intel_wedge_me *w,
 	w->name = name;
 
 	INIT_DELAYED_WORK_ONSTACK(&w->work, intel_wedge_me);
-	schedule_delayed_work(&w->work, timeout);
+	queue_delayed_work(gt->i915->unordered_wq, &w->work, timeout);
 }
 
 void __intel_fini_wedge(struct intel_wedge_me *w)

drivers/gpu/drm/i915/gt/intel_rps.c

@@ -73,13 +73,14 @@ static void set(struct intel_uncore *uncore, i915_reg_t reg, u32 val)
 static void rps_timer(struct timer_list *t)
 {
 	struct intel_rps *rps = from_timer(rps, t, timer);
+	struct intel_gt *gt = rps_to_gt(rps);
 	struct intel_engine_cs *engine;
 	ktime_t dt, last, timestamp;
 	enum intel_engine_id id;
 	s64 max_busy[3] = {};
 
 	timestamp = 0;
-	for_each_engine(engine, rps_to_gt(rps), id) {
+	for_each_engine(engine, gt, id) {
 		s64 busy;
 		int i;
 
@@ -123,7 +124,7 @@ static void rps_timer(struct timer_list *t)
 
 			busy += div_u64(max_busy[i], 1 << i);
 		}
-		GT_TRACE(rps_to_gt(rps),
+		GT_TRACE(gt,
 			 "busy:%lld [%d%%], max:[%lld, %lld, %lld], interval:%d\n",
 			 busy, (int)div64_u64(100 * busy, dt),
 			 max_busy[0], max_busy[1], max_busy[2],
@@ -133,12 +134,12 @@ static void rps_timer(struct timer_list *t)
 		    rps->cur_freq < rps->max_freq_softlimit) {
 			rps->pm_iir |= GEN6_PM_RP_UP_THRESHOLD;
 			rps->pm_interval = 1;
-			schedule_work(&rps->work);
+			queue_work(gt->i915->unordered_wq, &rps->work);
 		} else if (100 * busy < rps->power.down_threshold * dt &&
 			   rps->cur_freq > rps->min_freq_softlimit) {
 			rps->pm_iir |= GEN6_PM_RP_DOWN_THRESHOLD;
 			rps->pm_interval = 1;
-			schedule_work(&rps->work);
+			queue_work(gt->i915->unordered_wq, &rps->work);
 		} else {
 			rps->last_adj = 0;
 		}
@@ -973,7 +974,7 @@ static int rps_set_boost_freq(struct intel_rps *rps, u32 val)
 	}
 	mutex_unlock(&rps->lock);
 	if (boost)
-		schedule_work(&rps->work);
+		queue_work(rps_to_gt(rps)->i915->unordered_wq, &rps->work);
 
 	return 0;
 }
@@ -1025,7 +1026,8 @@ void intel_rps_boost(struct i915_request *rq)
 			if (!atomic_fetch_inc(&slpc->num_waiters)) {
 				GT_TRACE(rps_to_gt(rps), "boost fence:%llx:%llx\n",
 					 rq->fence.context, rq->fence.seqno);
-				schedule_work(&slpc->boost_work);
+				queue_work(rps_to_gt(rps)->i915->unordered_wq,
+					   &slpc->boost_work);
 			}
 
 			return;
@@ -1041,7 +1043,7 @@ void intel_rps_boost(struct i915_request *rq)
 			 rq->fence.context, rq->fence.seqno);
 
 		if (READ_ONCE(rps->cur_freq) < rps->boost_freq)
-			schedule_work(&rps->work);
+			queue_work(rps_to_gt(rps)->i915->unordered_wq, &rps->work);
 
 		WRITE_ONCE(rps->boosts, rps->boosts + 1); /* debug only */
 	}
@@ -1900,7 +1902,7 @@ void gen11_rps_irq_handler(struct intel_rps *rps, u32 pm_iir)
 	gen6_gt_pm_mask_irq(gt, events);
 
 	rps->pm_iir |= events;
-	schedule_work(&rps->work);
+	queue_work(gt->i915->unordered_wq, &rps->work);
 }
 
 void gen6_rps_irq_handler(struct intel_rps *rps, u32 pm_iir)
@@ -1917,7 +1919,7 @@ void gen6_rps_irq_handler(struct intel_rps *rps, u32 pm_iir)
 		gen6_gt_pm_mask_irq(gt, events);
 		rps->pm_iir |= events;
 
-		schedule_work(&rps->work);
+		queue_work(gt->i915->unordered_wq, &rps->work);
 		spin_unlock(gt->irq_lock);
 	}
 

drivers/gpu/drm/i915/gt/selftest_engine_cs.c

@@ -27,7 +27,7 @@ static void perf_begin(struct intel_gt *gt)
 
 	/* Boost gpufreq to max [waitboost] and keep it fixed */
 	atomic_inc(&gt->rps.num_waiters);
-	schedule_work(&gt->rps.work);
+	queue_work(gt->i915->unordered_wq, &gt->rps.work);
 	flush_work(&gt->rps.work);
 }
 

drivers/gpu/drm/i915/i915_driver.c

@@ -132,8 +132,20 @@ static int i915_workqueues_init(struct drm_i915_private *dev_priv)
 	if (dev_priv->display.hotplug.dp_wq == NULL)
 		goto out_free_wq;
 
+	/*
+	 * The unordered i915 workqueue should be used for all work
+	 * scheduling that do not require running in order, which used
+	 * to be scheduled on the system_wq before moving to a driver
+	 * instance due deprecation of flush_scheduled_work().
+	 */
+	dev_priv->unordered_wq = alloc_workqueue("i915-unordered", 0, 0);
+	if (dev_priv->unordered_wq == NULL)
+		goto out_free_dp_wq;
+
 	return 0;
 
+out_free_dp_wq:
+	destroy_workqueue(dev_priv->display.hotplug.dp_wq);
 out_free_wq:
 	destroy_workqueue(dev_priv->wq);
 out_err:
@@ -144,6 +156,7 @@ static int i915_workqueues_init(struct drm_i915_private *dev_priv)
 
 static void i915_workqueues_cleanup(struct drm_i915_private *dev_priv)
 {
+	destroy_workqueue(dev_priv->unordered_wq);
 	destroy_workqueue(dev_priv->display.hotplug.dp_wq);
 	destroy_workqueue(dev_priv->wq);
 }

drivers/gpu/drm/i915/i915_drv.h

@@ -260,6 +260,16 @@ struct drm_i915_private {
 	 */
 	struct workqueue_struct *wq;
 
+	/**
+	 * unordered_wq - internal workqueue for unordered work
+	 *
+	 * This workqueue should be used for all unordered work
+	 * scheduling within i915, which used to be scheduled on the
+	 * system_wq before moving to a driver instance due
+	 * deprecation of flush_scheduled_work().
+	 */
+	struct workqueue_struct *unordered_wq;
+
 	/* pm private clock gating functions */
 	const struct drm_i915_clock_gating_funcs *clock_gating_funcs;
 

drivers/gpu/drm/i915/i915_request.c

@@ -290,7 +290,7 @@ static enum hrtimer_restart __rq_watchdog_expired(struct hrtimer *hrtimer)
 
 	if (!i915_request_completed(rq)) {
 		if (llist_add(&rq->watchdog.link, &gt->watchdog.list))
-			schedule_work(&gt->watchdog.work);
+			queue_work(gt->i915->unordered_wq, &gt->watchdog.work);
 	} else {
 		i915_request_put(rq);
 	}

drivers/gpu/drm/i915/intel_wakeref.c

@@ -75,7 +75,7 @@ void __intel_wakeref_put_last(struct intel_wakeref *wf, unsigned long flags)
 
 	/* Assume we are not in process context and so cannot sleep. */
 	if (flags & INTEL_WAKEREF_PUT_ASYNC || !mutex_trylock(&wf->mutex)) {
-		mod_delayed_work(system_wq, &wf->work,
+		mod_delayed_work(wf->i915->unordered_wq, &wf->work,
 				 FIELD_GET(INTEL_WAKEREF_PUT_DELAY, flags));
 		return;
 	}

drivers/gpu/drm/i915/selftests/mock_gem_device.c

@@ -69,6 +69,7 @@ static void mock_device_release(struct drm_device *dev)
 	i915_gem_drain_workqueue(i915);
 
 	mock_fini_ggtt(to_gt(i915)->ggtt);
+	destroy_workqueue(i915->unordered_wq);
 	destroy_workqueue(i915->wq);
 
 	intel_region_ttm_device_fini(i915);
@@ -208,6 +209,10 @@ struct drm_i915_private *mock_gem_device(void)
 	if (!i915->wq)
 		goto err_drv;
 
+	i915->unordered_wq = alloc_workqueue("mock-unordered", 0, 0);
+	if (!i915->unordered_wq)
+		goto err_wq;
+
 	mock_init_contexts(i915);
 
 	/* allocate the ggtt */
@@ -239,6 +244,8 @@ struct drm_i915_private *mock_gem_device(void)
 err_context:
 	intel_gt_driver_remove(to_gt(i915));
 err_unlock:
+	destroy_workqueue(i915->unordered_wq);
+err_wq:
 	destroy_workqueue(i915->wq);
 err_drv:
 	intel_region_ttm_device_fini(i915);