tools/testing/cxl/mock_acpi.c

   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 }