[Intel-gfx] [PATCH v13 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>
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 | 22 ++++++++++++-------
 drivers/gpu/drm/i915/gt/uc/intel_uc.c         |  7 ++++++
 3 files changed, 22 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index 0949628d69f8b..2b6dfe62c8f2a 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 1377398afcdfa..3a0d20064878a 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 +1796,24 @@ 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)) {
+		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;
 	unsigned long index;
 	unsigned long flags;
-	unsigned long i;
 
 	if (unlikely(!guc_submission_initialized(guc))) {
 		/* Reset called during driver load? GuC not yet initialised! */
@@ -1833,12 +1844,7 @@ void intel_guc_submission_reset(struct intel_guc *guc, intel_engine_mask_t stall
 	 * The full GT reset will have cleared the TLB caches and flushed the
 	 * G2H message queue; we can release all the blocked waiters.
 	 */
-	if (HAS_GUC_TLB_INVALIDATION(guc_to_gt(guc)->i915)) {
-		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 guc_cancel_context_requests(struct intel_context *ce)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.c b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
index 98b103375b7ab..27f6561dd7319 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;
 }
 
-- 
2.25.1