1/*
 2 * Copyright 2018 Advanced Micro Devices, Inc.
 3 *
 4 * Permission is hereby granted, free of charge, to any person obtaining a
 5 * copy of this software and associated documentation files (the "Software"),
 6 * to deal in the Software without restriction, including without limitation
 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 8 * and/or sell copies of the Software, and to permit persons to whom the
 9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 */
23#include "amdgpu.h"
24#include "gfxhub_v1_1.h"
25
26#include "gc/gc_9_2_1_offset.h"
27#include "gc/gc_9_2_1_sh_mask.h"
28
29#include "soc15_common.h"
30
31int gfxhub_v1_1_get_xgmi_info(struct amdgpu_device *adev)
32{
33	u32 xgmi_lfb_cntl = RREG32_SOC15(GC, 0, mmMC_VM_XGMI_LFB_CNTL);
34	u32 max_region =
35		REG_GET_FIELD(xgmi_lfb_cntl, MC_VM_XGMI_LFB_CNTL, PF_MAX_REGION);
36
37	/* PF_MAX_REGION=0 means xgmi is disabled */
38	if (max_region) {
39		adev->gmc.xgmi.num_physical_nodes = max_region + 1;
40		if (adev->gmc.xgmi.num_physical_nodes > 4)
41			return -EINVAL;
42
43		adev->gmc.xgmi.physical_node_id =
44			REG_GET_FIELD(xgmi_lfb_cntl, MC_VM_XGMI_LFB_CNTL, PF_LFB_REGION);
45		if (adev->gmc.xgmi.physical_node_id > 3)
46			return -EINVAL;
47		adev->gmc.xgmi.node_segment_size = REG_GET_FIELD(
48			RREG32_SOC15(GC, 0, mmMC_VM_XGMI_LFB_SIZE),
49			MC_VM_XGMI_LFB_SIZE, PF_LFB_SIZE) << 24;
50	}
51
52	return 0;
53}