From 31b86cc1f1b0d44c5dd9d8cdab4bf2a58fc17bf6 Mon Sep 17 00:00:00 2001
From: Oak Zeng <Oak.Zeng@amd.com>
Date: Wed, 5 Aug 2020 10:53:09 -0500
Subject: [PATCH] drm/amdgpu: Add comment to function amdgpu_ttm_alloc_gart
Add comments to refect what function does
Signed-off-by: Oak Zeng <Oak.Zeng@amd.com>
Reviewed-by: Christian Konig <christian.koenig@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 868d577c5b67c..1a0bf585b58ca 100755
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1401,7 +1401,12 @@ static int amdgpu_ttm_backend_bind(struct ttm_tt *ttm,
}
/**
- * amdgpu_ttm_alloc_gart - Allocate GART memory for buffer object
+ * amdgpu_ttm_alloc_gart - Make sure buffer object is accessible either
+ * through AGP or GART aperture.
+ *
+ * If bo is accessible through AGP aperture, then use AGP aperture
+ * to access bo; otherwise allocate logical space in GART aperture
+ * and map bo to GART aperture.
*/
int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo)
{
--
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