drm/amdgpu: add the support of XGMI link for GC 9.4.3

Add the xgmi LFB_CNTL/LBF_SIZE reg addresses to fetch the xgmi info from.

v2: move get_xgmi_info() to GC_V9_4_3 sepecific source files to utilize
the register definitions specific for GC_V9_4_3
v3: remove the duplicated register definitions
v4: enable xgmi based on asic_type as XGMI_IP ver is not available
yet for IP discovery
Signed-off-by: Shiwu Zhang <shiwu.zhang@amd.com>
Reviewed-by: Le Ma <Le.Ma@amd.com>
Ack-by: Lijo Lazar <Lijo.Lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfxhub_v1_2.c

@@ -528,6 +528,45 @@ static void gfxhub_v1_2_init(struct amdgpu_device *adev)
 	}
 }
 
+static int gfxhub_v1_2_get_xgmi_info(struct amdgpu_device *adev)
+{
+	u32 max_num_physical_nodes;
+	u32 max_physical_node_id;
+	u32 xgmi_lfb_cntl;
+	u32 max_region;
+	u64 seg_size;
+
+	xgmi_lfb_cntl = RREG32_SOC15(GC, 0, regMC_VM_XGMI_LFB_CNTL);
+	seg_size = REG_GET_FIELD(
+		RREG32_SOC15(GC, 0, regMC_VM_XGMI_LFB_SIZE),
+		MC_VM_XGMI_LFB_SIZE, PF_LFB_SIZE) << 24;
+	max_region =
+		REG_GET_FIELD(xgmi_lfb_cntl, MC_VM_XGMI_LFB_CNTL, PF_MAX_REGION);
+
+
+
+	max_num_physical_nodes   = 8;
+	max_physical_node_id     = 7;
+
+	/* PF_MAX_REGION=0 means xgmi is disabled */
+	if (max_region || adev->gmc.xgmi.connected_to_cpu) {
+		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, MC_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 = seg_size;
+	}
+
+	return 0;
+}
 
 const struct amdgpu_gfxhub_funcs gfxhub_v1_2_funcs = {
 	.get_mc_fb_offset = gfxhub_v1_2_get_mc_fb_offset,
@@ -536,5 +575,5 @@ const struct amdgpu_gfxhub_funcs gfxhub_v1_2_funcs = {
 	.gart_disable = gfxhub_v1_2_gart_disable,
 	.set_fault_enable_default = gfxhub_v1_2_set_fault_enable_default,
 	.init = gfxhub_v1_2_init,
-	.get_xgmi_info = gfxhub_v1_1_get_xgmi_info,
+	.get_xgmi_info = gfxhub_v1_2_get_xgmi_info,
 };

drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c

@@ -1419,9 +1419,13 @@ static int gmc_v9_0_early_init(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
-	/* ARCT and VEGA20 don't have XGMI defined in their IP discovery tables */
-	if (adev->asic_type == CHIP_VEGA20 ||
-	    adev->asic_type == CHIP_ARCTURUS)
+	/*
+	 * 9.4.0, 9.4.1 and 9.4.3 don't have XGMI defined
+	 * in their IP discovery tables
+	 */
+	if (adev->ip_versions[GC_HWIP][0] == IP_VERSION(9, 4, 0) ||
+	    adev->ip_versions[GC_HWIP][0] == IP_VERSION(9, 4, 1) ||
+	    adev->ip_versions[GC_HWIP][0] == IP_VERSION(9, 4, 3))
 		adev->gmc.xgmi.supported = true;
 
 	if (adev->ip_versions[XGMI_HWIP][0] == IP_VERSION(6, 1, 0)) {