linux-kernel - [PATCH v7 04/12] drm/amdgpu: add amdgpu_gtt_node_to_byte

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Message-ID: <20260129153336.7473-5-pierre-eric.pelloux-prayer@amd.com>
Date: Thu, 29 Jan 2026 16:33:16 +0100
From: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>
To: Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>, David Airlie
	<airlied@...il.com>, Simona Vetter <simona@...ll.ch>
CC: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>,
	<amd-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v7 04/12] drm/amdgpu: add amdgpu_gtt_node_to_byte_offset helper

Having a helper avoids code duplication.

Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
index 871388b86503..c43f352df953 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
@@ -220,6 +220,14 @@ static inline u64 amdgpu_compute_gart_address(struct amdgpu_gmc *gmc,
 	return gmc->gart_start + entity->gart_window_offs[index];
 }
 
+/**
+ * amdgpu_gtt_node_to_byte_offset() - Returns a byte offset of a gtt node
+ */
+static inline u64 amdgpu_gtt_node_to_byte_offset(const struct drm_mm_node *gtt_node)
+{
+	return gtt_node->start * (u64)PAGE_SIZE;
+}
+
 void amdgpu_ttm_tt_set_user_pages(struct ttm_tt *ttm, struct amdgpu_hmm_range *range);
 int amdgpu_ttm_tt_get_userptr(const struct ttm_buffer_object *tbo,
 			      uint64_t *user_addr);
-- 
2.43.0