drm/amdgpu/gmc9: add a new gfxhub 1.1 helper for xgmi

Used to populate the xgmi info on vega20.

v2: PF_MAX_REGION is val - 1 (Ray)

Acked-by: Huang Rui <[e-mail]>
Acked-by: Slava Abramov <[e-mail]>
Reviewed-by :Shaoyun liu <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>
Acked-by: Christian König <[e-mail]>
Signed-off-by :Shaoyun liu <[e-mail]>

drivers/gpu/drm/amd/amdgpu/Makefile

···
 amdgpu-y += \
 	gmc_v7_0.o \
 	gmc_v8_0.o \
-	gfxhub_v1_0.o mmhub_v1_0.o gmc_v9_0.o
+	gfxhub_v1_0.o mmhub_v1_0.o gmc_v9_0.o gfxhub_v1_1.o
 
 # add IH block
 amdgpu-y += \

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

···
+/*
+ * Copyright 2018 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+#include "amdgpu.h"
+#include "gfxhub_v1_1.h"
+
+#include "gc/gc_9_2_1_offset.h"
+#include "gc/gc_9_2_1_sh_mask.h"
+
+#include "soc15_common.h"
+
+int gfxhub_v1_1_get_xgmi_info(struct amdgpu_device *adev)
+{
+	u32 xgmi_lfb_cntl = RREG32_SOC15(GC, 0, mmMC_VM_XGMI_LFB_CNTL);
+	u32 max_region =
+		REG_GET_FIELD(xgmi_lfb_cntl, MC_VM_XGMI_LFB_CNTL, PF_MAX_REGION);
+
+	/* 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 > 4)
+			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 > 3)
+			return -EINVAL;
+	}
+
+	return 0;
+}

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

···
+/*
+ * Copyright 2018 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef __GFXHUB_V1_1_H__
+#define __GFXHUB_V1_1_H__
+
+int gfxhub_v1_1_get_xgmi_info(struct amdgpu_device *adev);
+
+#endif

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

···
 
 #include "gfxhub_v1_0.h"
 #include "mmhub_v1_0.h"
+#include "gfxhub_v1_1.h"
 
 #include "ivsrcid/vmc/irqsrcs_vmc_1_0.h"
 
···
 		printk(KERN_WARNING "amdgpu: No coherent DMA available.\n");
 	}
 	adev->need_swiotlb = drm_get_max_iomem() > ((u64)1 << dma_bits);
+
+	if (adev->asic_type == CHIP_VEGA20) {
+		r = gfxhub_v1_1_get_xgmi_info(adev);
+		if (r)
+			return r;
+	}
 
 	r = gmc_v9_0_mc_init(adev);
 	if (r)