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From: Maarten Lankhorst <dev@lankhorst.se>
To: intel-xe@lists.freedesktop.org
Cc: Maarten Lankhorst <dev@lankhorst.se>
Subject: [PATCH v3 1/5] drm/xe: Make xe_ggtt_node offset relative to starting offset
Date: Tue, 13 Jan 2026 09:36:57 +0100	[thread overview]
Message-ID: <20260113083702.1276449-2-dev@lankhorst.se> (raw)
In-Reply-To: <20260113083702.1276449-1-dev@lankhorst.se>

This will make node shifting in the next commit a one-liner.

Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>
---
 drivers/gpu/drm/xe/xe_ggtt.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_ggtt.c b/drivers/gpu/drm/xe/xe_ggtt.c
index cb23d97845a86..cbea6dd9146cb 100644
--- a/drivers/gpu/drm/xe/xe_ggtt.c
+++ b/drivers/gpu/drm/xe/xe_ggtt.c
@@ -300,7 +300,7 @@ static void __xe_ggtt_init_early(struct xe_ggtt *ggtt, u64 start, u64 size)
 {
 	ggtt->start = start;
 	ggtt->size = size;
-	drm_mm_init(&ggtt->mm, start, size);
+	drm_mm_init(&ggtt->mm, 0, size);
 }
 
 int xe_ggtt_init_kunit(struct xe_ggtt *ggtt, u32 start, u32 size)
@@ -402,7 +402,7 @@ static void xe_ggtt_initial_clear(struct xe_ggtt *ggtt)
 	/* Display may have allocated inside ggtt, so be careful with clearing here */
 	mutex_lock(&ggtt->lock);
 	drm_mm_for_each_hole(hole, &ggtt->mm, start, end)
-		xe_ggtt_clear(ggtt, start, end - start);
+		xe_ggtt_clear(ggtt, ggtt->start + start, end - start);
 
 	xe_ggtt_invalidate(ggtt);
 	mutex_unlock(&ggtt->lock);
@@ -419,7 +419,7 @@ static void ggtt_node_remove(struct xe_ggtt_node *node)
 
 	mutex_lock(&ggtt->lock);
 	if (bound)
-		xe_ggtt_clear(ggtt, node->base.start, node->base.size);
+		xe_ggtt_clear(ggtt, xe_ggtt_node_addr(node), node->base.size);
 	drm_mm_remove_node(&node->base);
 	node->base.size = 0;
 	mutex_unlock(&ggtt->lock);
@@ -574,13 +574,13 @@ int xe_ggtt_node_insert_balloon_locked(struct xe_ggtt_node *node, u64 start, u64
 	lockdep_assert_held(&ggtt->lock);
 
 	node->base.color = 0;
-	node->base.start = start;
+	node->base.start = start - ggtt->start;
 	node->base.size = end - start;
 
 	err = drm_mm_reserve_node(&ggtt->mm, &node->base);
 
 	if (xe_tile_WARN(ggtt->tile, err, "Failed to balloon GGTT %#llx-%#llx (%pe)\n",
-			 node->base.start, node->base.start + node->base.size, ERR_PTR(err)))
+			 xe_ggtt_node_addr(node), xe_ggtt_node_addr(node) + node->base.size, ERR_PTR(err)))
 		return err;
 
 	xe_ggtt_dump_node(ggtt, &node->base, "balloon");
@@ -771,7 +771,7 @@ static void xe_ggtt_map_bo(struct xe_ggtt *ggtt, struct xe_ggtt_node *node,
 	if (XE_WARN_ON(!node))
 		return;
 
-	start = node->base.start;
+	start = xe_ggtt_node_addr(node);
 	end = start + xe_bo_size(bo);
 
 	if (!xe_bo_is_vram(bo) && !xe_bo_is_stolen(bo)) {
@@ -892,6 +892,17 @@ static int __xe_ggtt_insert_bo_at(struct xe_ggtt *ggtt, struct xe_bo *bo,
 	}
 
 	mutex_lock(&ggtt->lock);
+	/*
+	 * all cases where start < ggtt_start when 0 is passed as argument are
+	 * set to 0, as negative offsets are invalid.
+	 */
+	if (start < ggtt->start)
+		start = 0;
+	else
+		start -= ggtt->start;
+
+	end -= ggtt->start;
+
 	err = drm_mm_insert_node_in_range(&ggtt->mm, &bo->ggtt_node[tile_id]->base,
 					  xe_bo_size(bo), alignment, 0, start, end, 0);
 	if (err) {
@@ -1212,7 +1223,7 @@ u64 xe_ggtt_read_pte(struct xe_ggtt *ggtt, u64 offset)
  */
 u64 xe_ggtt_node_addr(const struct xe_ggtt_node *node)
 {
-	return node->base.start;
+	return node->base.start + node->ggtt->start;
 }
 
 /**
-- 
2.51.0


  reply	other threads:[~2026-01-13  8:37 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-01-13  8:36 [PATCH v3 0/5] drm/xe: Privatize struct xe_ggtt Maarten Lankhorst
2026-01-13  8:36 ` Maarten Lankhorst [this message]
2026-01-13  8:36 ` [PATCH v3 2/5] drm/xe: Rewrite GGTT VF initialisation Maarten Lankhorst
2026-01-13  8:36 ` [PATCH v3 3/5] drm/xe: Move struct xe_ggtt to xe_ggtt.c Maarten Lankhorst
2026-01-13  8:37 ` [PATCH v3 4/5] drm/xe: Make xe_ggtt_node_insert return a node Maarten Lankhorst
2026-01-13  8:37 ` [PATCH v3 5/5] drm/xe: Remove xe_ggtt_node_allocated Maarten Lankhorst
2026-01-13  8:44 ` ✗ CI.checkpatch: warning for drm/xe: Privatize struct xe_ggtt Patchwork
2026-01-13  8:45 ` ✓ CI.KUnit: success " Patchwork
2026-01-13  9:20 ` ✓ Xe.CI.BAT: " Patchwork

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