bus.c

 1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright(c) 2021 Intel Corporation. All rights rsvd. */
 3#include <linux/init.h>
 4#include <linux/kernel.h>
 5#include <linux/module.h>
 6#include <linux/device.h>
 7#include "idxd.h"
 8
 9
10int __idxd_driver_register(struct idxd_device_driver *idxd_drv, struct module *owner,
11			   const char *mod_name)
12{
13	struct device_driver *drv = &idxd_drv->drv;
14
15	if (!idxd_drv->type) {
16		pr_debug("driver type not set (%ps)\n", __builtin_return_address(0));
17		return -EINVAL;
18	}
19
20	drv->name = idxd_drv->name;
21	drv->bus = &dsa_bus_type;
22	drv->owner = owner;
23	drv->mod_name = mod_name;
24
25	return driver_register(drv);
26}
27EXPORT_SYMBOL_GPL(__idxd_driver_register);
28
29void idxd_driver_unregister(struct idxd_device_driver *idxd_drv)
30{
31	driver_unregister(&idxd_drv->drv);
32}
33EXPORT_SYMBOL_GPL(idxd_driver_unregister);
34
35static int idxd_config_bus_match(struct device *dev,
36				 const struct device_driver *drv)
37{
38	const struct idxd_device_driver *idxd_drv =
39		container_of_const(drv, struct idxd_device_driver, drv);
40	struct idxd_dev *idxd_dev = confdev_to_idxd_dev(dev);
41	int i = 0;
42
43	while (idxd_drv->type[i] != IDXD_DEV_NONE) {
44		if (idxd_dev->type == idxd_drv->type[i])
45			return 1;
46		i++;
47	}
48
49	return 0;
50}
51
52static int idxd_config_bus_probe(struct device *dev)
53{
54	struct idxd_device_driver *idxd_drv =
55		container_of(dev->driver, struct idxd_device_driver, drv);
56	struct idxd_dev *idxd_dev = confdev_to_idxd_dev(dev);
57
58	return idxd_drv->probe(idxd_dev);
59}
60
61static void idxd_config_bus_remove(struct device *dev)
62{
63	struct idxd_device_driver *idxd_drv =
64		container_of(dev->driver, struct idxd_device_driver, drv);
65	struct idxd_dev *idxd_dev = confdev_to_idxd_dev(dev);
66
67	idxd_drv->remove(idxd_dev);
68}
69
70static int idxd_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
71{
72	return add_uevent_var(env, "MODALIAS=" IDXD_DEVICES_MODALIAS_FMT, 0);
73}
74
75const struct bus_type dsa_bus_type = {
76	.name = "dsa",
77	.match = idxd_config_bus_match,
78	.probe = idxd_config_bus_probe,
79	.remove = idxd_config_bus_remove,
80	.uevent = idxd_bus_uevent,
81};
82EXPORT_SYMBOL_GPL(dsa_bus_type);
83
84static int __init dsa_bus_init(void)
85{
86	return bus_register(&dsa_bus_type);
87}
88module_init(dsa_bus_init);
89
90static void __exit dsa_bus_exit(void)
91{
92	bus_unregister(&dsa_bus_type);
93}
94module_exit(dsa_bus_exit);
95
96MODULE_DESCRIPTION("IDXD driver dsa_bus_type driver");
97MODULE_LICENSE("GPL v2");