From: Philip Yang <Philip.Yang@amd.com>
Date: Tue, 9 Dec 2025 23:15:23 +0000 (-0500)
Subject: drm/amdgpu: Add helper to alloc GART entries
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=698fa62f56aa3600efcfb11dd04f84e938dfc5fa;p=thirdparty%2Fkernel%2Flinux.git

drm/amdgpu: Add helper to alloc GART entries

Add helper amdgpu_gtt_mgr_alloc/free_entries, define
GART_ENTRY_WITHOUT_BO_COLOR color for GART node not allocated with GTT
bo, then amdgpu_gtt_mgr_recover skip those mm_node.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
index 895c1e4c6747..dd9b845d5783 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
@@ -26,6 +26,8 @@
 
 #include "amdgpu.h"
 
+#define GART_ENTRY_WITHOUT_BO_COLOR	1
+
 static inline struct amdgpu_gtt_mgr *
 to_gtt_mgr(struct ttm_resource_manager *man)
 {
@@ -180,6 +182,49 @@ static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man,
 	kfree(node);
 }
 
+/**
+ * amdgpu_gtt_mgr_alloc_entries - alloc GART entries without GTT bo
+ *
+ * @mgr: The GTT manager object
+ * @mm_node: The drm mm node to return the new allocation node information
+ * @num_pages: The number of pages for the new allocation
+ * @mode: The new allocation mode
+ *
+ * Helper to dynamic alloc GART entries to map memory not accociated with
+ * GTT BO, for example VRAM BO physical memory, remote physical memory.
+ */
+int amdgpu_gtt_mgr_alloc_entries(struct amdgpu_gtt_mgr *mgr,
+				 struct drm_mm_node *mm_node,
+				 u64 num_pages,
+				 enum drm_mm_insert_mode mode)
+{
+	struct amdgpu_device *adev = container_of(mgr, typeof(*adev), mman.gtt_mgr);
+	int r;
+
+	spin_lock(&mgr->lock);
+	r = drm_mm_insert_node_in_range(&mgr->mm, mm_node, num_pages,
+					0, GART_ENTRY_WITHOUT_BO_COLOR, 0,
+					adev->gmc.gart_size >> PAGE_SHIFT,
+					mode);
+	spin_unlock(&mgr->lock);
+	return r;
+}
+
+/**
+ * amdgpu_gtt_mgr_free_entries - free GART entries not accocaited with GTT bo
+ *
+ * @mgr: The GTT manager object
+ * @mm_node: The drm mm node to free
+ */
+void amdgpu_gtt_mgr_free_entries(struct amdgpu_gtt_mgr *mgr,
+				 struct drm_mm_node *mm_node)
+{
+	spin_lock(&mgr->lock);
+	if (drm_mm_node_allocated(mm_node))
+		drm_mm_remove_node(mm_node);
+	spin_unlock(&mgr->lock);
+}
+
 /**
  * amdgpu_gtt_mgr_recover - re-init gart
  *
@@ -196,6 +241,9 @@ void amdgpu_gtt_mgr_recover(struct amdgpu_gtt_mgr *mgr)
 	adev = container_of(mgr, typeof(*adev), mman.gtt_mgr);
 	spin_lock(&mgr->lock);
 	drm_mm_for_each_node(mm_node, &mgr->mm) {
+		if (mm_node->color == GART_ENTRY_WITHOUT_BO_COLOR)
+			continue;
+
 		node = container_of(mm_node, typeof(*node), mm_nodes[0]);
 		amdgpu_ttm_recover_gart(node->base.bo);
 	}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
index 72488124aa59..143201ecea3f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
@@ -141,6 +141,12 @@ void amdgpu_vram_mgr_fini(struct amdgpu_device *adev);
 bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *mem);
 void amdgpu_gtt_mgr_recover(struct amdgpu_gtt_mgr *mgr);
 
+int amdgpu_gtt_mgr_alloc_entries(struct amdgpu_gtt_mgr *mgr,
+				 struct drm_mm_node *mm_node,
+				 u64 num_pages,
+				 enum drm_mm_insert_mode mode);
+void amdgpu_gtt_mgr_free_entries(struct amdgpu_gtt_mgr *mgr,
+				 struct drm_mm_node *mm_node);
 uint64_t amdgpu_preempt_mgr_usage(struct ttm_resource_manager *man);
 
 u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo);