drivers/gpu/drm/amd/amdgpu/gfxhub_v1_1.c

   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 }