drivers/usb/usbip/stub.h

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2003-2008 Takahiro Hirofuchi
   4  */
   5
   6 #ifndef __USBIP_STUB_H
   7 #define __USBIP_STUB_H
   8
   9 #include <linux/list.h>
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/types.h>
  13 #include <linux/usb.h>
  14 #include <linux/wait.h>
  15
  16 #define STUB_BUSID_OTHER 0
  17 #define STUB_BUSID_REMOV 1
  18 #define STUB_BUSID_ADDED 2
  19 #define STUB_BUSID_ALLOC 3
  20
  21 struct stub_device {
  22         struct usb_device *udev;
  23
  24         struct usbip_device ud;
  25         __u32 devid;
  26
  27         /*
  28          * stub_priv preserves private data of each urb.
  29          * It is allocated as stub_priv_cache and assigned to urb->context.
  30          *
  31          * stub_priv is always linked to any one of 3 lists;
  32          *      priv_init: linked to this until the comletion of a urb.
  33          *      priv_tx  : linked to this after the completion of a urb.
  34          *      priv_free: linked to this after the sending of the result.
  35          *
  36          * Any of these list operations should be locked by priv_lock.
  37          */
  38         spinlock_t priv_lock;
  39         struct list_head priv_init;
  40         struct list_head priv_tx;
  41         struct list_head priv_free;
  42
  43         /* see comments for unlinking in stub_rx.c */
  44         struct list_head unlink_tx;
  45         struct list_head unlink_free;
  46
  47         wait_queue_head_t tx_waitq;
  48 };
  49
  50 /* private data into urb->priv */
  51 struct stub_priv {
  52         unsigned long seqnum;
  53         struct list_head list;
  54         struct stub_device *sdev;
  55         struct urb *urb;
  56
  57         int unlinking;
  58 };
  59
  60 struct stub_unlink {
  61         unsigned long seqnum;
  62         struct list_head list;
  63         __u32 status;
  64 };
  65
  66 /* same as SYSFS_BUS_ID_SIZE */
  67 #define BUSID_SIZE 32
  68
  69 struct bus_id_priv {
  70         char name[BUSID_SIZE];
  71         char status;
  72         int interf_count;
  73         struct stub_device *sdev;
  74         struct usb_device *udev;
  75         char shutdown_busid;
  76         spinlock_t busid_lock;
  77 };
  78
  79 /* stub_priv is allocated from stub_priv_cache */
  80 extern struct kmem_cache *stub_priv_cache;
  81
  82 /* stub_dev.c */
  83 extern struct usb_device_driver stub_driver;
  84
  85 /* stub_main.c */
  86 struct bus_id_priv *get_busid_priv(const char *busid);
  87 void put_busid_priv(struct bus_id_priv *bid);
  88 int del_match_busid(char *busid);
  89 void stub_device_cleanup_urbs(struct stub_device *sdev);
  90
  91 /* stub_rx.c */
  92 int stub_rx_loop(void *data);
  93
  94 /* stub_tx.c */
  95 void stub_enqueue_ret_unlink(struct stub_device *sdev, __u32 seqnum,
  96                              __u32 status);
  97 void stub_complete(struct urb *urb);
  98 int stub_tx_loop(void *data);
  99
 100 #endif /* __USBIP_STUB_H */