From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Wed, 28 Jun 2017 12:18:54 +0200
Subject: drm/amdgpu: reserve the first 2x512 pages of GART
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Git-commit: cc25188afdb886044785be4c29f3993c3a3b2b92
Patch-mainline: v4.14-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

We want to use them as remap address space.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c |    5 ++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h     |    3 +++
 2 files changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
@@ -43,12 +43,15 @@ static int amdgpu_gtt_mgr_init(struct tt
 			       unsigned long p_size)
 {
 	struct amdgpu_gtt_mgr *mgr;
+	uint64_t start, size;
 
 	mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
 	if (!mgr)
 		return -ENOMEM;
 
-	drm_mm_init(&mgr->mm, 0, p_size);
+	start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
+	size = p_size - start;
+	drm_mm_init(&mgr->mm, start, size);
 	spin_lock_init(&mgr->lock);
 	mgr->available = p_size;
 	man->priv = mgr;
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
@@ -34,6 +34,9 @@
 #define AMDGPU_PL_FLAG_GWS		(TTM_PL_FLAG_PRIV << 1)
 #define AMDGPU_PL_FLAG_OA		(TTM_PL_FLAG_PRIV << 2)
 
+#define AMDGPU_GTT_MAX_TRANSFER_SIZE	512
+#define AMDGPU_GTT_NUM_TRANSFER_WINDOWS	2
+
 struct amdgpu_mman {
 	struct ttm_bo_global_ref        bo_global_ref;
 	struct drm_global_reference	mem_global_ref;