[PATCH 2/3] drm/xe: Drop xe_gt_tlb_invalidation_wait

Matthew Brost matthew.brost at intel.com
Thu Jul 18 05:27:32 UTC 2024


Having two methods to wait on GT TLB invalidations is not ideal. Remove
xe_gt_tlb_invalidation_wait and only use GT TLB invalidation fences.

In addition to two methods being less than ideal, once GT TLB
invalidations are coalesced the seqno cannot be assigned during
xe_gt_tlb_invalidation_ggtt/range. Thus xe_gt_tlb_invalidation_wait
would not have a seqno to wait one. A fence however can be armed and
later signaled.

v3:
 - Add explaination about coalescing to commit message

Signed-off-by: Matthew Brost <matthew.brost at intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das at intel.com>
---
 drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c | 101 ++++++--------------
 drivers/gpu/drm/xe/xe_gt_tlb_invalidation.h |   7 +-
 drivers/gpu/drm/xe/xe_vm.c                  |  28 +++---
 3 files changed, 49 insertions(+), 87 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c b/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c
index 92a18a0e4acd..687214d07ac7 100644
--- a/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c
+++ b/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c
@@ -111,7 +111,6 @@ invalidation_fence_signal(struct xe_device *xe, struct xe_gt_tlb_invalidation_fe
 void xe_gt_tlb_invalidation_reset(struct xe_gt *gt)
 {
 	struct xe_gt_tlb_invalidation_fence *fence, *next;
-	struct xe_guc *guc = &gt->uc.guc;
 	int pending_seqno;
 
 	/*
@@ -134,7 +133,6 @@ void xe_gt_tlb_invalidation_reset(struct xe_gt *gt)
 	else
 		pending_seqno = gt->tlb_invalidation.seqno - 1;
 	WRITE_ONCE(gt->tlb_invalidation.seqno_recv, pending_seqno);
-	wake_up_all(&guc->ct.wq);
 
 	list_for_each_entry_safe(fence, next,
 				 &gt->tlb_invalidation.pending_fences, link)
@@ -165,6 +163,8 @@ static int send_tlb_invalidation(struct xe_guc *guc,
 	int seqno;
 	int ret;
 
+	xe_gt_assert(gt, fence);
+
 	/*
 	 * XXX: The seqno algorithm relies on TLB invalidation being processed
 	 * in order which they currently are, if that changes the algorithm will
@@ -173,10 +173,8 @@ static int send_tlb_invalidation(struct xe_guc *guc,
 
 	mutex_lock(&guc->ct.lock);
 	seqno = gt->tlb_invalidation.seqno;
-	if (fence) {
-		fence->seqno = seqno;
-		trace_xe_gt_tlb_invalidation_fence_send(xe, fence);
-	}
+	fence->seqno = seqno;
+	trace_xe_gt_tlb_invalidation_fence_send(xe, fence);
 	action[1] = seqno;
 	ret = xe_guc_ct_send_locked(&guc->ct, action, len,
 				    G2H_LEN_DW_TLB_INVALIDATE, 1);
@@ -209,7 +207,6 @@ static int send_tlb_invalidation(struct xe_guc *guc,
 			TLB_INVALIDATION_SEQNO_MAX;
 		if (!gt->tlb_invalidation.seqno)
 			gt->tlb_invalidation.seqno = 1;
-		ret = seqno;
 	}
 	mutex_unlock(&guc->ct.lock);
 
@@ -223,14 +220,16 @@ static int send_tlb_invalidation(struct xe_guc *guc,
 /**
  * xe_gt_tlb_invalidation_guc - Issue a TLB invalidation on this GT for the GuC
  * @gt: graphics tile
+ * @fence: invalidation fence which will be signal on TLB invalidation
+ * completion
  *
  * Issue a TLB invalidation for the GuC. Completion of TLB is asynchronous and
- * caller can use seqno + xe_gt_tlb_invalidation_wait to wait for completion.
+ * caller can use the invalidation fence to wait for completion.
  *
- * Return: Seqno which can be passed to xe_gt_tlb_invalidation_wait on success,
- * negative error code on error.
+ * Return: 0 on success, negative error code on error
  */
-static int xe_gt_tlb_invalidation_guc(struct xe_gt *gt)
+static int xe_gt_tlb_invalidation_guc(struct xe_gt *gt,
+				      struct xe_gt_tlb_invalidation_fence *fence)
 {
 	u32 action[] = {
 		XE_GUC_ACTION_TLB_INVALIDATION,
@@ -238,7 +237,7 @@ static int xe_gt_tlb_invalidation_guc(struct xe_gt *gt)
 		MAKE_INVAL_OP(XE_GUC_TLB_INVAL_GUC),
 	};
 
-	return send_tlb_invalidation(&gt->uc.guc, NULL, action,
+	return send_tlb_invalidation(&gt->uc.guc, fence, action,
 				     ARRAY_SIZE(action));
 }
 
@@ -257,13 +256,15 @@ int xe_gt_tlb_invalidation_ggtt(struct xe_gt *gt)
 
 	if (xe_guc_ct_enabled(&gt->uc.guc.ct) &&
 	    gt->uc.guc.submission_state.enabled) {
-		int seqno;
+		struct xe_gt_tlb_invalidation_fence fence;
+		int ret;
 
-		seqno = xe_gt_tlb_invalidation_guc(gt);
-		if (seqno <= 0)
-			return seqno;
+		xe_gt_tlb_invalidation_fence_init(gt, &fence);
+		ret = xe_gt_tlb_invalidation_guc(gt, &fence);
+		if (ret < 0)
+			return ret;
 
-		xe_gt_tlb_invalidation_wait(gt, seqno);
+		xe_gt_tlb_invalidation_fence_wait(&fence);
 	} else if (xe_device_uc_enabled(xe) && !xe_device_wedged(xe)) {
 		if (IS_SRIOV_VF(xe))
 			return 0;
@@ -290,18 +291,16 @@ int xe_gt_tlb_invalidation_ggtt(struct xe_gt *gt)
  *
  * @gt: graphics tile
  * @fence: invalidation fence which will be signal on TLB invalidation
- * completion, can be NULL
+ * completion
  * @start: start address
  * @end: end address
  * @asid: address space id
  *
  * Issue a range based TLB invalidation if supported, if not fallback to a full
- * TLB invalidation. Completion of TLB is asynchronous and caller can either use
- * the invalidation fence or seqno + xe_gt_tlb_invalidation_wait to wait for
- * completion.
+ * TLB invalidation. Completion of TLB is asynchronous and caller can use
+ * the invalidation fence to wait for completion.
  *
- * Return: Seqno which can be passed to xe_gt_tlb_invalidation_wait on success,
- * negative error code on error.
+ * Return: Negative error code on error, 0 on success
  */
 int xe_gt_tlb_invalidation_range(struct xe_gt *gt,
 				 struct xe_gt_tlb_invalidation_fence *fence,
@@ -312,11 +311,11 @@ int xe_gt_tlb_invalidation_range(struct xe_gt *gt,
 	u32 action[MAX_TLB_INVALIDATION_LEN];
 	int len = 0;
 
+	xe_gt_assert(gt, fence);
+
 	/* Execlists not supported */
 	if (gt_to_xe(gt)->info.force_execlist) {
-		if (fence)
-			__invalidation_fence_signal(xe, fence);
-
+		__invalidation_fence_signal(xe, fence);
 		return 0;
 	}
 
@@ -382,12 +381,10 @@ int xe_gt_tlb_invalidation_range(struct xe_gt *gt,
  * @vma: VMA to invalidate
  *
  * Issue a range based TLB invalidation if supported, if not fallback to a full
- * TLB invalidation. Completion of TLB is asynchronous and caller can either use
- * the invalidation fence or seqno + xe_gt_tlb_invalidation_wait to wait for
- * completion.
+ * TLB invalidation. Completion of TLB is asynchronous and caller can use
+ * the invalidation fence to wait for completion.
  *
- * Return: Seqno which can be passed to xe_gt_tlb_invalidation_wait on success,
- * negative error code on error.
+ * Return: Negative error code on error, 0 on success
  */
 int xe_gt_tlb_invalidation_vma(struct xe_gt *gt,
 			       struct xe_gt_tlb_invalidation_fence *fence,
@@ -400,43 +397,6 @@ int xe_gt_tlb_invalidation_vma(struct xe_gt *gt,
 					    xe_vma_vm(vma)->usm.asid);
 }
 
-/**
- * xe_gt_tlb_invalidation_wait - Wait for TLB to complete
- * @gt: graphics tile
- * @seqno: seqno to wait which was returned from xe_gt_tlb_invalidation
- *
- * Wait for tlb_timeout_jiffies() for a TLB invalidation to complete.
- *
- * Return: 0 on success, -ETIME on TLB invalidation timeout
- */
-int xe_gt_tlb_invalidation_wait(struct xe_gt *gt, int seqno)
-{
-	struct xe_guc *guc = &gt->uc.guc;
-	int ret;
-
-	/* Execlists not supported */
-	if (gt_to_xe(gt)->info.force_execlist)
-		return 0;
-
-	/*
-	 * XXX: See above, this algorithm only works if seqno are always in
-	 * order
-	 */
-	ret = wait_event_timeout(guc->ct.wq,
-				 tlb_invalidation_seqno_past(gt, seqno),
-				 tlb_timeout_jiffies(gt));
-	if (!ret) {
-		struct drm_printer p = xe_gt_err_printer(gt);
-
-		xe_gt_err(gt, "TLB invalidation time'd out, seqno=%d, recv=%d\n",
-			  seqno, gt->tlb_invalidation.seqno_recv);
-		xe_guc_ct_print(&guc->ct, &p, true);
-		return -ETIME;
-	}
-
-	return 0;
-}
-
 /**
  * xe_guc_tlb_invalidation_done_handler - TLB invalidation done handler
  * @guc: guc
@@ -480,12 +440,7 @@ int xe_guc_tlb_invalidation_done_handler(struct xe_guc *guc, u32 *msg, u32 len)
 		return 0;
 	}
 
-	/*
-	 * wake_up_all() and wait_event_timeout() already have the correct
-	 * barriers.
-	 */
 	WRITE_ONCE(gt->tlb_invalidation.seqno_recv, msg[0]);
-	wake_up_all(&guc->ct.wq);
 
 	list_for_each_entry_safe(fence, next,
 				 &gt->tlb_invalidation.pending_fences, link) {
diff --git a/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.h b/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.h
index 948f4a2f5214..cbf49b3d0265 100644
--- a/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.h
+++ b/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.h
@@ -23,10 +23,15 @@ int xe_gt_tlb_invalidation_vma(struct xe_gt *gt,
 int xe_gt_tlb_invalidation_range(struct xe_gt *gt,
 				 struct xe_gt_tlb_invalidation_fence *fence,
 				 u64 start, u64 end, u32 asid);
-int xe_gt_tlb_invalidation_wait(struct xe_gt *gt, int seqno);
 int xe_guc_tlb_invalidation_done_handler(struct xe_guc *guc, u32 *msg, u32 len);
 
 void xe_gt_tlb_invalidation_fence_init(struct xe_gt *gt,
 				       struct xe_gt_tlb_invalidation_fence *fence);
 
+static inline void
+xe_gt_tlb_invalidation_fence_wait(struct xe_gt_tlb_invalidation_fence *fence)
+{
+	dma_fence_wait(&fence->base, false);
+}
+
 #endif	/* _XE_GT_TLB_INVALIDATION_ */
diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index b6932cc98ff9..135bccc72d50 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -3180,8 +3180,8 @@ int xe_vm_invalidate_vma(struct xe_vma *vma)
 {
 	struct xe_device *xe = xe_vma_vm(vma)->xe;
 	struct xe_tile *tile;
+	struct xe_gt_tlb_invalidation_fence fence[XE_MAX_TILES_PER_DEVICE];
 	u32 tile_needs_invalidate = 0;
-	int seqno[XE_MAX_TILES_PER_DEVICE];
 	u8 id;
 	int ret;
 
@@ -3208,29 +3208,31 @@ int xe_vm_invalidate_vma(struct xe_vma *vma)
 
 	for_each_tile(tile, xe, id) {
 		if (xe_pt_zap_ptes(tile, vma)) {
-			tile_needs_invalidate |= BIT(id);
 			xe_device_wmb(xe);
+			xe_gt_tlb_invalidation_fence_init(tile->primary_gt,
+							  &fence[id]);
+
 			/*
 			 * FIXME: We potentially need to invalidate multiple
 			 * GTs within the tile
 			 */
-			seqno[id] = xe_gt_tlb_invalidation_vma(tile->primary_gt, NULL, vma);
-			if (seqno[id] < 0)
-				return seqno[id];
-		}
-	}
-
-	for_each_tile(tile, xe, id) {
-		if (tile_needs_invalidate & BIT(id)) {
-			ret = xe_gt_tlb_invalidation_wait(tile->primary_gt, seqno[id]);
+			ret = xe_gt_tlb_invalidation_vma(tile->primary_gt,
+							 &fence[id], vma);
 			if (ret < 0)
-				return ret;
+				goto wait;
+
+			tile_needs_invalidate |= BIT(id);
 		}
 	}
 
+wait:
+	for_each_tile(tile, xe, id)
+		if (tile_needs_invalidate & BIT(id))
+			xe_gt_tlb_invalidation_fence_wait(&fence[id]);
+
 	vma->tile_invalidated = vma->tile_mask;
 
-	return 0;
+	return ret;
 }
 
 struct xe_vm_snapshot {
-- 
2.34.1



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