drivers/dma/idxd/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
  10 int __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 }
  27 EXPORT_SYMBOL_GPL(__idxd_driver_register);
  28
  29 void idxd_driver_unregister(struct idxd_device_driver *idxd_drv)
  30 {
  31         driver_unregister(&idxd_drv->drv);
  32 }
  33 EXPORT_SYMBOL_GPL(idxd_driver_unregister);
  34
  35 static 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
  52 static 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
  61 static 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
  70 static 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
  75 const 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 };
  82 EXPORT_SYMBOL_GPL(dsa_bus_type);
  83
  84 static int __init dsa_bus_init(void)
  85 {
  86         return bus_register(&dsa_bus_type);
  87 }
  88 module_init(dsa_bus_init);
  89
  90 static void __exit dsa_bus_exit(void)
  91 {
  92         bus_unregister(&dsa_bus_type);
  93 }
  94 module_exit(dsa_bus_exit);
  95
  96 MODULE_DESCRIPTION("IDXD driver dsa_bus_type driver");
  97 MODULE_LICENSE("GPL v2");