[Intel-gfx] [PATCH v8 4/7] drm/i915: No TLB invalidation on suspended GT

[Jonathan Cavitt]

In case of GT is suspended, don't allow submission of new TLB invalidation
request and cancel all pending requests. The TLB entries will be
invalidated either during GuC reload or on system resume.

Signed-off-by: Fei Yang <fei.yang at intel.com>
Signed-off-by: Jonathan Cavitt <jonathan.cavitt at intel.com>
CC: John Harrison <john.c.harrison at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt.h            |  1 +
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |  1 +
 .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 23 +++++++++++++++----
 drivers/gpu/drm/i915/gt/uc/intel_uc.c         |  8 +++++++
 drivers/gpu/drm/i915/i915_driver.c            |  2 ++
 5 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt.h b/drivers/gpu/drm/i915/gt/intel_gt.h
index 970bedf6b78a7..4e3bb221d2f4d 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt.h
@@ -179,4 +179,5 @@ enum i915_map_type intel_gt_coherent_map_type(struct intel_gt *gt,
 void intel_gt_bind_context_set_ready(struct intel_gt *gt);
 void intel_gt_bind_context_set_unready(struct intel_gt *gt);
 bool intel_gt_is_bind_context_ready(struct intel_gt *gt);
+
 #endif /* __INTEL_GT_H__ */
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index 88deb43bbdc48..add74000e621e 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
@@ -536,4 +536,5 @@ void intel_guc_dump_time_info(struct intel_guc *guc, struct drm_printer *p);
 
 int intel_guc_sched_disable_gucid_threshold_max(struct intel_guc *guc);
 
+void wake_up_all_tlb_invalidate(struct intel_guc *guc);
 #endif
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 0c5ccda1b3e87..4ed6e9e759007 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1796,13 +1796,23 @@ static void __guc_reset_context(struct intel_context *ce, intel_engine_mask_t st
 	intel_context_put(parent);
 }
 
-void intel_guc_submission_reset(struct intel_guc *guc, intel_engine_mask_t stalled)
+void wake_up_all_tlb_invalidate(struct intel_guc *guc)
 {
 	struct intel_guc_tlb_wait *wait;
+	unsigned long i;
+
+	if (!HAS_GUC_TLB_INVALIDATION(guc_to_gt(guc)->i915))
+		return;
+	xa_for_each(&guc->tlb_lookup, i, wait) {
+		wake_up(&wait->wq);
+	}
+}
+
+void intel_guc_submission_reset(struct intel_guc *guc, intel_engine_mask_t stalled)
+{
 	struct intel_context *ce;
 	unsigned long index;
 	unsigned long flags;
-	unsigned long i;
 
 	if (unlikely(!guc_submission_initialized(guc))) {
 		/* Reset called during driver load? GuC not yet initialised! */
@@ -1838,8 +1848,7 @@ void intel_guc_submission_reset(struct intel_guc *guc, intel_engine_mask_t stall
 	 * invalidations on GT reset, and there's a large window of time
 	 * between the GT reset and GuC becoming available.
 	 */
-	xa_for_each(&guc->tlb_lookup, i, wait)
-		wake_up(&wait->wq);
+	wake_up_all_tlb_invalidate(guc);
 }
 
 static void guc_cancel_context_requests(struct intel_context *ce)
@@ -1935,6 +1944,12 @@ void intel_guc_submission_cancel_requests(struct intel_guc *guc)
 
 	/* GuC is blown away, drop all references to contexts */
 	xa_destroy(&guc->context_lookup);
+
+	/*
+	 * Wedged GT won't respond to any TLB invalidation request. Simply
+	 * release all the blocked waiters.
+	 */
+	wake_up_all_tlb_invalidate(guc);
 }
 
 void intel_guc_submission_reset_finish(struct intel_guc *guc)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.c b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
index 98b103375b7ab..8d6a4d8ce61bb 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
@@ -688,6 +688,9 @@ void intel_uc_suspend(struct intel_uc *uc)
 	/* flush the GSC worker */
 	intel_gsc_uc_flush_work(&uc->gsc);
 
+	if (HAS_GUC_TLB_INVALIDATION(guc_to_gt(guc)->i915))
+		wake_up_all_tlb_invalidate(guc);
+
 	if (!intel_guc_is_ready(guc)) {
 		guc->interrupts.enabled = false;
 		return;
@@ -736,6 +739,11 @@ static int __uc_resume(struct intel_uc *uc, bool enable_communication)
 
 	intel_gsc_uc_resume(&uc->gsc);
 
+	if (HAS_GUC_TLB_INVALIDATION(gt->i915)) {
+		intel_guc_invalidate_tlb_engines(guc);
+		intel_guc_invalidate_tlb_guc(guc);
+	}
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
index ccbb2834cde07..85ac9400c2dc7 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -72,6 +72,7 @@
 #include "gt/intel_gt.h"
 #include "gt/intel_gt_pm.h"
 #include "gt/intel_rc6.h"
+#include "gt/intel_tlb.h"
 
 #include "pxp/intel_pxp.h"
 #include "pxp/intel_pxp_debugfs.h"
@@ -1093,6 +1094,7 @@ static int i915_drm_suspend(struct drm_device *dev)
 	intel_dp_mst_suspend(dev_priv);
 
 	intel_runtime_pm_disable_interrupts(dev_priv);
+
 	intel_hpd_cancel_work(dev_priv);
 
 	intel_suspend_encoders(dev_priv);
-- 
2.25.1