LXR linux/drivers/gpu/drm/amd/amdgpu/gfxhub_v1

   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}
  54