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1// SPDX-License-Identifier: GPL-2.0-only2/* Copyright(c) 2021 Intel Corporation. All rights reserved. */3 4#include <linux/platform_device.h>5#include <linux/device.h>6#include <linux/acpi.h>7#include <cxl.h>8#include "test/mock.h"9 10struct acpi_device *to_cxl_host_bridge(struct device *host, struct device *dev)11{12 int index;13 struct acpi_device *adev, *found = NULL;14 struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);15 16 if (ops && ops->is_mock_bridge(dev)) {17 found = ACPI_COMPANION(dev);18 goto out;19 }20 21 if (dev_is_platform(dev))22 goto out;23 24 adev = to_acpi_device(dev);25 if (!acpi_pci_find_root(adev->handle))26 goto out;27 28 if (strcmp(acpi_device_hid(adev), "ACPI0016") == 0) {29 found = adev;30 dev_dbg(host, "found host bridge %s\n", dev_name(&adev->dev));31 }32out:33 put_cxl_mock_ops(index);34 return found;35}36