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From: Maarten Lankhorst <dev@lankhorst.se>
To: intel-xe@lists.freedesktop.org
Cc: Maarten Lankhorst <dev@lankhorst.se>
Subject: [PATCH 3/7] drm/xe: Add xe_ggtt_node_addr() to avoid dereferencing xe_ggtt_node
Date: Tue, 21 Oct 2025 14:18:17 +0200	[thread overview]
Message-ID: <20251021121814.2193153-12-dev@lankhorst.se> (raw)
In-Reply-To: <20251021121814.2193153-9-dev@lankhorst.se>

This function makes it possible to add an offset that is applied to
all xe_ggtt_node's, and hides the internals from all its users.

Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>
---
 drivers/gpu/drm/xe/xe_bo.h   |  8 +++++---
 drivers/gpu/drm/xe/xe_ggtt.c | 11 +++++++++++
 drivers/gpu/drm/xe/xe_ggtt.h |  2 ++
 3 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_bo.h b/drivers/gpu/drm/xe/xe_bo.h
index 911d5b90461a2..9c3f0ebaa1554 100644
--- a/drivers/gpu/drm/xe/xe_bo.h
+++ b/drivers/gpu/drm/xe/xe_bo.h
@@ -9,6 +9,7 @@
 #include <drm/ttm/ttm_tt.h>
 
 #include "xe_bo_types.h"
+#include "xe_ggtt.h"
 #include "xe_macros.h"
 #include "xe_validation.h"
 #include "xe_vm_types.h"
@@ -251,13 +252,14 @@ static inline u32
 __xe_bo_ggtt_addr(struct xe_bo *bo, u8 tile_id)
 {
 	struct xe_ggtt_node *ggtt_node = bo->ggtt_node[tile_id];
+	u64 offset;
 
 	if (XE_WARN_ON(!ggtt_node))
 		return 0;
 
-	XE_WARN_ON(ggtt_node->base.size > xe_bo_size(bo));
-	XE_WARN_ON(ggtt_node->base.start + ggtt_node->base.size > (1ull << 32));
-	return ggtt_node->base.start;
+	offset = xe_ggtt_node_addr(ggtt_node);
+	XE_WARN_ON(offset + xe_bo_size(bo) > (1ull << 32));
+	return offset;
 }
 
 static inline u32
diff --git a/drivers/gpu/drm/xe/xe_ggtt.c b/drivers/gpu/drm/xe/xe_ggtt.c
index 42e3caa3a6d9c..05515037e2d6a 100644
--- a/drivers/gpu/drm/xe/xe_ggtt.c
+++ b/drivers/gpu/drm/xe/xe_ggtt.c
@@ -1079,3 +1079,14 @@ u64 xe_ggtt_read_pte(struct xe_ggtt *ggtt, u64 offset)
 {
 	return ioread64(ggtt->gsm + (offset / XE_PAGE_SIZE));
 }
+
+/**
+ * xe_ggtt_node_addr - Get @node offset in GGTT.
+ * @node: &xe_ggtt_node
+ *
+ * Get the GGTT offset for allocated node.
+ */
+u64 xe_ggtt_node_addr(const struct xe_ggtt_node *node)
+{
+	return node->base.start;
+}
diff --git a/drivers/gpu/drm/xe/xe_ggtt.h b/drivers/gpu/drm/xe/xe_ggtt.h
index d54a2ae2b4aa8..4a8ef1b824156 100644
--- a/drivers/gpu/drm/xe/xe_ggtt.h
+++ b/drivers/gpu/drm/xe/xe_ggtt.h
@@ -58,4 +58,6 @@ void xe_ggtt_might_lock(struct xe_ggtt *ggtt);
 u64 xe_ggtt_encode_pte_flags(struct xe_ggtt *ggtt, struct xe_bo *bo, u16 pat_index);
 u64 xe_ggtt_read_pte(struct xe_ggtt *ggtt, u64 offset);
 
+u64 xe_ggtt_node_addr(const struct xe_ggtt_node *node);
+
 #endif
-- 
2.51.0


  parent reply	other threads:[~2025-10-21 12:18 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-10-21 12:18 [PATCH 0/7] drm/xe: Privatize struct xe_ggtt_node Maarten Lankhorst
2025-10-21 12:18 ` [PATCH 1/7] drm/xe: Start using ggtt->start in preparation of balloon removal Maarten Lankhorst
2025-10-21 12:18 ` [PATCH 2/7] drm/xe: Convert xe_fb_pin to use a callback for insertion into GGTT Maarten Lankhorst
2025-10-21 12:18 ` Maarten Lankhorst [this message]
2025-10-21 13:15   ` [PATCH 3/7] drm/xe: Add xe_ggtt_node_addr() to avoid dereferencing xe_ggtt_node Michal Wajdeczko
2025-10-21 13:48     ` Maarten Lankhorst
2025-10-21 12:18 ` [PATCH 4/7] drm/xe/display: Avoid " Maarten Lankhorst
2025-10-21 12:18 ` [PATCH 5/7] drm/xe: Do not dereference ggtt_node in xe_bo.c Maarten Lankhorst
2025-10-21 12:18 ` [PATCH 6/7] drm/xe: Improve xe_gt_sriov_pf_config GGTT handling Maarten Lankhorst
2025-10-21 12:46   ` Michal Wajdeczko
2025-10-21 12:18 ` [PATCH 7/7] drm/xe: Privatize xe_ggtt_node Maarten Lankhorst
2025-10-21 13:49 ` ✗ CI.checkpatch: warning for drm/xe: Privatize struct xe_ggtt_node Patchwork
2025-10-21 13:50 ` ✗ CI.KUnit: failure " Patchwork

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