1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 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 10 struct 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->bus == &platform_bus_type) 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 } 32 out: 33 put_cxl_mock_ops(index); 34 return found; 35 } 36