[PATCH v16 4/7] drm/i915: No TLB invalidation on suspended GT

[Andi Shyti]

From: Jonathan Cavitt <jonathan.cavitt at intel.com>

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>
Reviewed-by: Andi Shyti <andi.shyti at linux.intel.com>
Acked-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Acked-by: Nirmoy Das <nirmoy.das at intel.com>
---
 drivers/gpu/drm/i915/gt/uc/intel_guc.h        |  1 +
 .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 24 ++++++++++++-------
 drivers/gpu/drm/i915/gt/uc/intel_uc.c         |  7 ++++++
 3 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index 0949628d69f8..2b6dfe62c8f2 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
@@ -537,4 +537,5 @@ int intel_guc_invalidate_tlb_engines(struct intel_guc *guc);
 int intel_guc_invalidate_tlb_guc(struct intel_guc *guc);
 int intel_guc_tlb_invalidation_done(struct intel_guc *guc,
 				    const u32 *payload, u32 len);
+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 80a6d35373e3..ba1f27c4d16c 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1796,6 +1796,20 @@ static void __guc_reset_context(struct intel_context *ce, intel_engine_mask_t st
 	intel_context_put(parent);
 }
 
+void wake_up_all_tlb_invalidate(struct intel_guc *guc)
+{
+	struct intel_guc_tlb_wait *wait;
+	unsigned long i;
+
+	if (!intel_guc_tlb_invalidation_is_available(guc))
+		return;
+
+	xa_lock_irq(&guc->tlb_lookup);
+	xa_for_each(&guc->tlb_lookup, i, wait)
+		wake_up(&wait->wq);
+	xa_unlock_irq(&guc->tlb_lookup);
+}
+
 void intel_guc_submission_reset(struct intel_guc *guc, intel_engine_mask_t stalled)
 {
 	struct intel_context *ce;
@@ -1925,9 +1939,6 @@ void intel_guc_submission_cancel_requests(struct intel_guc *guc)
 
 void intel_guc_submission_reset_finish(struct intel_guc *guc)
 {
-	struct intel_guc_tlb_wait *wait;
-	long unsigned int i;
-
 	/* Reset called during driver load or during wedge? */
 	if (unlikely(!guc_submission_initialized(guc) ||
 		     intel_gt_is_wedged(guc_to_gt(guc)))) {
@@ -1951,12 +1962,7 @@ void intel_guc_submission_reset_finish(struct intel_guc *guc)
 	 * The full GT reset will have cleared the TLB caches and flushed the
 	 * G2H message queue; we can release all the blocked waiters.
 	 */
-	if (intel_guc_tlb_invalidation_is_available(guc)) {
-		xa_lock_irq(&guc->tlb_lookup);
-		xa_for_each(&guc->tlb_lookup, i, wait)
-			wake_up(&wait->wq);
-		xa_unlock_irq(&guc->tlb_lookup);
-	}
+	wake_up_all_tlb_invalidate(guc);
 }
 
 static void destroyed_worker_func(struct work_struct *w);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.c b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
index 98b103375b7a..27f6561dd731 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
@@ -688,6 +688,8 @@ void intel_uc_suspend(struct intel_uc *uc)
 	/* flush the GSC worker */
 	intel_gsc_uc_flush_work(&uc->gsc);
 
+	wake_up_all_tlb_invalidate(guc);
+
 	if (!intel_guc_is_ready(guc)) {
 		guc->interrupts.enabled = false;
 		return;
@@ -736,6 +738,11 @@ static int __uc_resume(struct intel_uc *uc, bool enable_communication)
 
 	intel_gsc_uc_resume(&uc->gsc);
 
+	if (intel_guc_tlb_invalidation_is_available(guc)) {
+		intel_guc_invalidate_tlb_engines(guc);
+		intel_guc_invalidate_tlb_guc(guc);
+	}
+
 	return 0;
 }
 
-- 
2.40.1