drm/amdgpu: add amdgpu_mmhub_funcs definition

add amdgpu_mmhub_funcs definition and initialize it,
prepare for mmhub ras enablement

Signed-off-by: Tao Zhou <[e-mail]>
Reviewed-by: Hawking Zhang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 #include "amdgpu_discovery.h"
 #include "amdgpu_mes.h"
 #include "amdgpu_umc.h"
+#include "amdgpu_mmhub.h"
 
 #define MAX_GPU_INSTANCE		16
 
···
 
 	const struct amdgpu_nbio_funcs	*nbio_funcs;
 	const struct amdgpu_df_funcs	*df_funcs;
+	const struct amdgpu_mmhub_funcs	*mmhub_funcs;
 
 	/* delayed work_func for deferring clockgating during resume */
 	struct delayed_work     delayed_init_work;

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

···
+/*
+ * Copyright (C) 2019  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) 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 __AMDGPU_MMHUB_H__
+#define __AMDGPU_MMHUB_H__
+
+struct amdgpu_mmhub_funcs {
+	void (*ras_init)(struct amdgpu_device *adev);
+	void (*query_ras_error_count)(struct amdgpu_device *adev,
+					void *ras_error_status);
+};
+
+#endif
+

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

···
 	}
 }
 
+static void gmc_v9_0_set_mmhub_funcs(struct amdgpu_device *adev)
+{
+	switch (adev->asic_type) {
+	case CHIP_VEGA20:
+		adev->mmhub_funcs = &mmhub_v1_0_funcs;
+		break;
+	default:
+		break;
+	}
+}
+
 static int gmc_v9_0_early_init(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
···
 	gmc_v9_0_set_gmc_funcs(adev);
 	gmc_v9_0_set_irq_funcs(adev);
 	gmc_v9_0_set_umc_funcs(adev);
+	gmc_v9_0_set_mmhub_funcs(adev);
 
 	adev->gmc.shared_aperture_start = 0x2000000000000000ULL;
 	adev->gmc.shared_aperture_end =

drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c

···
 	if (data & ATC_L2_MISC_CG__MEM_LS_ENABLE_MASK)
 		*flags |= AMD_CG_SUPPORT_MC_LS;
 }
+
+static void mmhub_v1_0_query_ras_error_count(struct amdgpu_device *adev,
+					   void *ras_error_status)
+{
+}
+
+const struct amdgpu_mmhub_funcs mmhub_v1_0_funcs = {
+	.query_ras_error_count = mmhub_v1_0_query_ras_error_count,
+};

drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.h

···
 #ifndef __MMHUB_V1_0_H__
 #define __MMHUB_V1_0_H__
 
+extern const struct amdgpu_mmhub_funcs mmhub_v1_0_funcs;
+
 u64 mmhub_v1_0_get_fb_location(struct amdgpu_device *adev);
 int mmhub_v1_0_gart_enable(struct amdgpu_device *adev);
 void mmhub_v1_0_gart_disable(struct amdgpu_device *adev);