drm/amdgpu: save the reset dump register value for devcoredump

Allocate memory for register value and use the same values for devcoredump.
v1 -> v2: Change krealloc_array() to kmalloc_array()
v2 -> v3: Fix alignment
Signed-off-by: Somalapuram Amaranath <Amaranath.Somalapuram@amd.com>
Reviewed-by: Shashank Sharma <Shashank.sharma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1044,6 +1044,7 @@ struct amdgpu_device {
 
 	/* reset dump register */
 	uint32_t                        *reset_dump_reg_list;
+	uint32_t			*reset_dump_reg_value;
 	int                             num_regs;
 
 	bool                            scpm_enabled;

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

@@ -1709,17 +1709,24 @@ static ssize_t amdgpu_reset_dump_register_list_write(struct file *f,
 		i++;
 	} while (len < size);
 
+	new = kmalloc_array(i, sizeof(uint32_t), GFP_KERNEL);
+	if (!new) {
+		ret = -ENOMEM;
+		goto error_free;
+	}
 	ret = down_write_killable(&adev->reset_domain->sem);
 	if (ret)
 		goto error_free;
 
 	swap(adev->reset_dump_reg_list, tmp);
+	swap(adev->reset_dump_reg_value, new);
 	adev->num_regs = i;
 	up_write(&adev->reset_domain->sem);
 	ret = size;
 
 error_free:
 	kfree(tmp);
+	kfree(new);
 	return ret;
 }
 

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

@@ -4666,15 +4666,15 @@ int amdgpu_device_pre_asic_reset(struct amdgpu_device *adev,
 
 static int amdgpu_reset_reg_dumps(struct amdgpu_device *adev)
 {
-	uint32_t reg_value;
 	int i;
 
 	lockdep_assert_held(&adev->reset_domain->sem);
 	dump_stack();
 
 	for (i = 0; i < adev->num_regs; i++) {
-		reg_value = RREG32(adev->reset_dump_reg_list[i]);
-		trace_amdgpu_reset_reg_dumps(adev->reset_dump_reg_list[i], reg_value);
+		adev->reset_dump_reg_value[i] = RREG32(adev->reset_dump_reg_list[i]);
+		trace_amdgpu_reset_reg_dumps(adev->reset_dump_reg_list[i],
+					     adev->reset_dump_reg_value[i]);
 	}
 
 	return 0;