drm/amdgpu: add XGMI support for sienna cichlid

support for setting up XGMI FB address regions
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: John Clements <john.clements@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfxhub_v2_1.c

@@ -373,3 +373,39 @@ void gfxhub_v2_1_init(struct amdgpu_device *adev)
 	hub->vm_l2_pro_fault_cntl =
 		SOC15_REG_OFFSET(GC, 0, mmGCVM_L2_PROTECTION_FAULT_CNTL);
 }
+
+int gfxhub_v2_1_get_xgmi_info(struct amdgpu_device *adev)
+{
+	u32 xgmi_lfb_cntl = RREG32_SOC15(GC, 0, mmGCMC_VM_XGMI_LFB_CNTL);
+	u32 max_region =
+		REG_GET_FIELD(xgmi_lfb_cntl, GCMC_VM_XGMI_LFB_CNTL, PF_MAX_REGION);
+	u32 max_num_physical_nodes   = 0;
+	u32 max_physical_node_id     = 0;
+
+	switch (adev->asic_type) {
+	case CHIP_SIENNA_CICHLID:
+		max_num_physical_nodes   = 4;
+		max_physical_node_id     = 3;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* PF_MAX_REGION=0 means xgmi is disabled */
+	if (max_region) {
+		adev->gmc.xgmi.num_physical_nodes = max_region + 1;
+		if (adev->gmc.xgmi.num_physical_nodes > max_num_physical_nodes)
+			return -EINVAL;
+
+		adev->gmc.xgmi.physical_node_id =
+			REG_GET_FIELD(xgmi_lfb_cntl, GCMC_VM_XGMI_LFB_CNTL, PF_LFB_REGION);
+		if (adev->gmc.xgmi.physical_node_id > max_physical_node_id)
+			return -EINVAL;
+
+		adev->gmc.xgmi.node_segment_size = REG_GET_FIELD(
+			RREG32_SOC15(GC, 0, mmGCMC_VM_XGMI_LFB_SIZE),
+			GCMC_VM_XGMI_LFB_SIZE, PF_LFB_SIZE) << 24;
+	}
+
+	return 0;
+}

drivers/gpu/drm/amd/amdgpu/gfxhub_v2_1.h

@@ -34,4 +34,6 @@ u64 gfxhub_v2_1_get_mc_fb_offset(struct amdgpu_device *adev);
 void gfxhub_v2_1_setup_vm_pt_regs(struct amdgpu_device *adev, uint32_t vmid,
 				uint64_t page_table_base);
 
+int gfxhub_v2_1_get_xgmi_info(struct amdgpu_device *adev);
+
 #endif

drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c

@@ -691,6 +691,9 @@ static void gmc_v10_0_vram_gtt_location(struct amdgpu_device *adev,
 	else
 		base = gfxhub_v2_0_get_fb_location(adev);
 
+	/* add the xgmi offset of the physical node */
+	base += adev->gmc.xgmi.physical_node_id * adev->gmc.xgmi.node_segment_size;
+
 	amdgpu_gmc_vram_location(adev, &adev->gmc, base);
 	amdgpu_gmc_gart_location(adev, mc);
 
@@ -699,6 +702,10 @@ static void gmc_v10_0_vram_gtt_location(struct amdgpu_device *adev,
 		adev->vm_manager.vram_base_offset = gfxhub_v2_1_get_mc_fb_offset(adev);
 	else
 		adev->vm_manager.vram_base_offset = gfxhub_v2_0_get_mc_fb_offset(adev);
+
+	/* add the xgmi offset of the physical node */
+	adev->vm_manager.vram_base_offset +=
+		adev->gmc.xgmi.physical_node_id * adev->gmc.xgmi.node_segment_size;
 }
 
 /**
@@ -871,6 +878,12 @@ static int gmc_v10_0_sw_init(void *handle)
 		return r;
 	}
 
+	if (adev->gmc.xgmi.supported) {
+		r = gfxhub_v2_1_get_xgmi_info(adev);
+		if (r)
+			return r;
+	}
+
 	r = gmc_v10_0_mc_init(adev);
 	if (r)
 		return r;