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 
31 int 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 }
54