drm/amdgpu: Add mode2 reset support for aldebaran

v1: Aldebaran uses reset control to support mode2 reset. The sequences to
reset and restore hardware context are specific to a particular
configuration.

v2: Clear bus mastering before reset.
Fix coding style issues, drop unwanted variables and info log.
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/Makefile

@@ -71,7 +71,7 @@ amdgpu-y += \
 	vi.o mxgpu_vi.o nbio_v6_1.o soc15.o emu_soc.o mxgpu_ai.o nbio_v7_0.o vega10_reg_init.o \
 	vega20_reg_init.o nbio_v7_4.o nbio_v2_3.o nv.o navi10_reg_init.o navi14_reg_init.o \
 	arct_reg_init.o navi12_reg_init.o mxgpu_nv.o sienna_cichlid_reg_init.o vangogh_reg_init.o \
-	nbio_v7_2.o dimgrey_cavefish_reg_init.o hdp_v4_0.o hdp_v5_0.o aldebaran_reg_init.o
+	nbio_v7_2.o dimgrey_cavefish_reg_init.o hdp_v4_0.o hdp_v5_0.o aldebaran_reg_init.o aldebaran.o
 
 # add DF block
 amdgpu-y += \

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

+/*
+ * Copyright 2021 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 __ALDEBARAN_H__
+#define __ALDEBARAN_H__
+
+#include "amdgpu.h"
+
+int aldebaran_reset_init(struct amdgpu_device *adev);
+int aldebaran_reset_fini(struct amdgpu_device *adev);
+
+#endif

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

@@ -36,6 +36,14 @@ int amdgpu_reset_init(struct amdgpu_device *adev)
 {
 	int ret = 0;
 
+	switch (adev->asic_type) {
+	case CHIP_ALDEBARAN:
+		ret = aldebaran_reset_init(adev);
+		break;
+	default:
+		break;
+	}
+
 	return ret;
 }
 
@@ -43,6 +51,14 @@ int amdgpu_reset_fini(struct amdgpu_device *adev)
 {
 	int ret = 0;
 
+	switch (adev->asic_type) {
+	case CHIP_ALDEBARAN:
+		ret = aldebaran_reset_fini(adev);
+		break;
+	default:
+		break;
+	}
+
 	return ret;
 }
 

drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c

@@ -4024,8 +4024,14 @@ static int gfx_v9_0_hw_fini(void *handle)
 	}
 
 	gfx_v9_0_cp_enable(adev, false);
-	adev->gfx.rlc.funcs->stop(adev);
 
+	/* Skip suspend with A+A reset */
+	if (adev->gmc.xgmi.connected_to_cpu && amdgpu_in_reset(adev)) {
+		dev_dbg(adev->dev, "Device in reset. Skipping RLC halt\n");
+		return 0;
+	}
+
+	adev->gfx.rlc.funcs->stop(adev);
 	return 0;
 }