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kernel/drivers/usb/usbip/usbip_common.h
Andreas Gruenbacher 6309727ef2 kthread: add kthread_stop_put 
Add a kthread_stop_put() helper that stops a thread and puts its task
struct.  Use it to replace the various instances of kthread_stop()
followed by put_task_struct().

Remove the kthread_stop_put() macro in usbip that is similar but doesn't
return the result of kthread_stop().

[agruenba@redhat.com: fix kerneldoc comment]
  Link: https://lkml.kernel.org/r/20230911111730.2565537-1-agruenba@redhat.com
[akpm@linux-foundation.org: document kthread_stop_put()'s argument]
Link: https://lkml.kernel.org/r/20230907234048.2499820-1-agruenba@redhat.com
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2023-10-04 10:41:57 -07:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2003-2008 Takahiro Hirofuchi
* Copyright (C) 2015-2016 Samsung Electronics
* Krzysztof Opasiak <k.opasiak@samsung.com>
*/
#ifndef __USBIP_COMMON_H
#define __USBIP_COMMON_H
#include <linux/compiler.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/net.h>
#include <linux/printk.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/usb.h>
#include <linux/wait.h>
#include <linux/sched/task.h>
#include <linux/kcov.h>
#include <uapi/linux/usbip.h>
#undef pr_fmt
#ifdef DEBUG
#define pr_fmt(fmt) KBUILD_MODNAME ": %s:%d: " fmt, __func__, __LINE__
#else
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#endif
enum {
usbip_debug_xmit = (1 << 0),
usbip_debug_sysfs = (1 << 1),
usbip_debug_urb = (1 << 2),
usbip_debug_eh = (1 << 3),
usbip_debug_stub_cmp = (1 << 8),
usbip_debug_stub_dev = (1 << 9),
usbip_debug_stub_rx = (1 << 10),
usbip_debug_stub_tx = (1 << 11),
usbip_debug_vhci_rh = (1 << 8),
usbip_debug_vhci_hc = (1 << 9),
usbip_debug_vhci_rx = (1 << 10),
usbip_debug_vhci_tx = (1 << 11),
usbip_debug_vhci_sysfs = (1 << 12)
};
#define usbip_dbg_flag_xmit (usbip_debug_flag & usbip_debug_xmit)
#define usbip_dbg_flag_vhci_rh (usbip_debug_flag & usbip_debug_vhci_rh)
#define usbip_dbg_flag_vhci_hc (usbip_debug_flag & usbip_debug_vhci_hc)
#define usbip_dbg_flag_vhci_rx (usbip_debug_flag & usbip_debug_vhci_rx)
#define usbip_dbg_flag_vhci_tx (usbip_debug_flag & usbip_debug_vhci_tx)
#define usbip_dbg_flag_stub_rx (usbip_debug_flag & usbip_debug_stub_rx)
#define usbip_dbg_flag_stub_tx (usbip_debug_flag & usbip_debug_stub_tx)
#define usbip_dbg_flag_vhci_sysfs (usbip_debug_flag & usbip_debug_vhci_sysfs)
extern unsigned long usbip_debug_flag;
extern struct device_attribute dev_attr_usbip_debug;
#define usbip_dbg_with_flag(flag, fmt, args...) \
do { \
if (flag & usbip_debug_flag) \
pr_debug(fmt, ##args); \
} while (0)
#define usbip_dbg_sysfs(fmt, args...) \
usbip_dbg_with_flag(usbip_debug_sysfs, fmt , ##args)
#define usbip_dbg_xmit(fmt, args...) \
usbip_dbg_with_flag(usbip_debug_xmit, fmt , ##args)
#define usbip_dbg_urb(fmt, args...) \
usbip_dbg_with_flag(usbip_debug_urb, fmt , ##args)
#define usbip_dbg_eh(fmt, args...) \
usbip_dbg_with_flag(usbip_debug_eh, fmt , ##args)
#define usbip_dbg_vhci_rh(fmt, args...) \
usbip_dbg_with_flag(usbip_debug_vhci_rh, fmt , ##args)
#define usbip_dbg_vhci_hc(fmt, args...) \
usbip_dbg_with_flag(usbip_debug_vhci_hc, fmt , ##args)
#define usbip_dbg_vhci_rx(fmt, args...) \
usbip_dbg_with_flag(usbip_debug_vhci_rx, fmt , ##args)
#define usbip_dbg_vhci_tx(fmt, args...) \
usbip_dbg_with_flag(usbip_debug_vhci_tx, fmt , ##args)
#define usbip_dbg_vhci_sysfs(fmt, args...) \
usbip_dbg_with_flag(usbip_debug_vhci_sysfs, fmt , ##args)
#define usbip_dbg_stub_cmp(fmt, args...) \
usbip_dbg_with_flag(usbip_debug_stub_cmp, fmt , ##args)
#define usbip_dbg_stub_rx(fmt, args...) \
usbip_dbg_with_flag(usbip_debug_stub_rx, fmt , ##args)
#define usbip_dbg_stub_tx(fmt, args...) \
usbip_dbg_with_flag(usbip_debug_stub_tx, fmt , ##args)
/*
* USB/IP request headers
*
* Each request is transferred across the network to its counterpart, which
* facilitates the normal USB communication. The values contained in the headers
* are basically the same as in a URB. Currently, four request types are
* defined:
*
* - USBIP_CMD_SUBMIT: a USB request block, corresponds to usb_submit_urb()
* (client to server)
*
* - USBIP_RET_SUBMIT: the result of USBIP_CMD_SUBMIT
* (server to client)
*
* - USBIP_CMD_UNLINK: an unlink request of a pending USBIP_CMD_SUBMIT,
* corresponds to usb_unlink_urb()
* (client to server)
*
* - USBIP_RET_UNLINK: the result of USBIP_CMD_UNLINK
* (server to client)
*
*/
#define USBIP_CMD_SUBMIT 0x0001
#define USBIP_CMD_UNLINK 0x0002
#define USBIP_RET_SUBMIT 0x0003
#define USBIP_RET_UNLINK 0x0004
#define USBIP_DIR_OUT 0x00
#define USBIP_DIR_IN 0x01
/*
* Arbitrary limit for the maximum number of isochronous packets in an URB,
* compare for example the uhci_submit_isochronous function in
* drivers/usb/host/uhci-q.c
*/
#define USBIP_MAX_ISO_PACKETS 1024
/**
* struct usbip_header_basic - data pertinent to every request
* @command: the usbip request type
* @seqnum: sequential number that identifies requests; incremented per
* connection
* @devid: specifies a remote USB device uniquely instead of busnum and devnum;
* in the stub driver, this value is ((busnum << 16) | devnum)
* @direction: direction of the transfer
* @ep: endpoint number
*/
struct usbip_header_basic {
__u32 command;
__u32 seqnum;
__u32 devid;
__u32 direction;
__u32 ep;
} __packed;
/**
* struct usbip_header_cmd_submit - USBIP_CMD_SUBMIT packet header
* @transfer_flags: URB flags
* @transfer_buffer_length: the data size for (in) or (out) transfer
* @start_frame: initial frame for isochronous or interrupt transfers
* @number_of_packets: number of isochronous packets
* @interval: maximum time for the request on the server-side host controller
* @setup: setup data for a control request
*/
struct usbip_header_cmd_submit {
__u32 transfer_flags;
__s32 transfer_buffer_length;
/* it is difficult for usbip to sync frames (reserved only?) */
__s32 start_frame;
__s32 number_of_packets;
__s32 interval;
unsigned char setup[8];
} __packed;
/**
* struct usbip_header_ret_submit - USBIP_RET_SUBMIT packet header
* @status: return status of a non-iso request
* @actual_length: number of bytes transferred
* @start_frame: initial frame for isochronous or interrupt transfers
* @number_of_packets: number of isochronous packets
* @error_count: number of errors for isochronous transfers
*/
struct usbip_header_ret_submit {
__s32 status;
__s32 actual_length;
__s32 start_frame;
__s32 number_of_packets;
__s32 error_count;
} __packed;
/**
* struct usbip_header_cmd_unlink - USBIP_CMD_UNLINK packet header
* @seqnum: the URB seqnum to unlink
*/
struct usbip_header_cmd_unlink {
__u32 seqnum;
} __packed;
/**
* struct usbip_header_ret_unlink - USBIP_RET_UNLINK packet header
* @status: return status of the request
*/
struct usbip_header_ret_unlink {
__s32 status;
} __packed;
/**
* struct usbip_header - common header for all usbip packets
* @base: the basic header
* @u: packet type dependent header
*/
struct usbip_header {
struct usbip_header_basic base;
union {
struct usbip_header_cmd_submit cmd_submit;
struct usbip_header_ret_submit ret_submit;
struct usbip_header_cmd_unlink cmd_unlink;
struct usbip_header_ret_unlink ret_unlink;
} u;
} __packed;
/*
* This is the same as usb_iso_packet_descriptor but packed for pdu.
*/
struct usbip_iso_packet_descriptor {
__u32 offset;
__u32 length; /* expected length */
__u32 actual_length;
__u32 status;
} __packed;
enum usbip_side {
USBIP_VHCI,
USBIP_STUB,
USBIP_VUDC,
};
/* event handler */
#define USBIP_EH_SHUTDOWN (1 << 0)
#define USBIP_EH_BYE (1 << 1)
#define USBIP_EH_RESET (1 << 2)
#define USBIP_EH_UNUSABLE (1 << 3)
#define SDEV_EVENT_REMOVED (USBIP_EH_SHUTDOWN | USBIP_EH_BYE)
#define SDEV_EVENT_DOWN (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
#define SDEV_EVENT_ERROR_TCP (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
#define SDEV_EVENT_ERROR_SUBMIT (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
#define SDEV_EVENT_ERROR_MALLOC (USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
#define VUDC_EVENT_REMOVED (USBIP_EH_SHUTDOWN | USBIP_EH_RESET | USBIP_EH_BYE)
#define VUDC_EVENT_DOWN (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
#define VUDC_EVENT_ERROR_TCP (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
/* catastrophic emulated usb error */
#define VUDC_EVENT_ERROR_USB (USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
#define VUDC_EVENT_ERROR_MALLOC (USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
#define VDEV_EVENT_REMOVED (USBIP_EH_SHUTDOWN | USBIP_EH_RESET | USBIP_EH_BYE)
#define VDEV_EVENT_DOWN (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
#define VDEV_EVENT_ERROR_TCP (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
#define VDEV_EVENT_ERROR_MALLOC (USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
/* a common structure for stub_device and vhci_device */
struct usbip_device {
enum usbip_side side;
enum usbip_device_status status;
/* lock for status */
spinlock_t lock;
/* mutex for synchronizing sysfs store paths */
struct mutex sysfs_lock;
int sockfd;
struct socket *tcp_socket;
struct task_struct *tcp_rx;
struct task_struct *tcp_tx;
unsigned long event;
wait_queue_head_t eh_waitq;
struct eh_ops {
void (*shutdown)(struct usbip_device *);
void (*reset)(struct usbip_device *);
void (*unusable)(struct usbip_device *);
} eh_ops;
#ifdef CONFIG_KCOV
u64 kcov_handle;
#endif
};
#define kthread_get_run(threadfn, data, namefmt, ...) \
({ \
struct task_struct *__k \
= kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); \
if (!IS_ERR(__k)) { \
get_task_struct(__k); \
wake_up_process(__k); \
} \
__k; \
})
/* usbip_common.c */
void usbip_dump_urb(struct urb *purb);
void usbip_dump_header(struct usbip_header *pdu);
int usbip_recv(struct socket *sock, void *buf, int size);
void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
int pack);
void usbip_header_correct_endian(struct usbip_header *pdu, int send);
struct usbip_iso_packet_descriptor*
usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen);
/* some members of urb must be substituted before. */
int usbip_recv_iso(struct usbip_device *ud, struct urb *urb);
void usbip_pad_iso(struct usbip_device *ud, struct urb *urb);
int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb);
/* usbip_event.c */
int usbip_init_eh(void);
void usbip_finish_eh(void);
int usbip_start_eh(struct usbip_device *ud);
void usbip_stop_eh(struct usbip_device *ud);
void usbip_event_add(struct usbip_device *ud, unsigned long event);
int usbip_event_happened(struct usbip_device *ud);
int usbip_in_eh(struct task_struct *task);
static inline int interface_to_busnum(struct usb_interface *interface)
{
struct usb_device *udev = interface_to_usbdev(interface);
return udev->bus->busnum;
}
static inline int interface_to_devnum(struct usb_interface *interface)
{
struct usb_device *udev = interface_to_usbdev(interface);
return udev->devnum;
}
#ifdef CONFIG_KCOV
static inline void usbip_kcov_handle_init(struct usbip_device *ud)
{
ud->kcov_handle = kcov_common_handle();
}
static inline void usbip_kcov_remote_start(struct usbip_device *ud)
{
kcov_remote_start_common(ud->kcov_handle);
}
static inline void usbip_kcov_remote_stop(void)
{
kcov_remote_stop();
}
#else /* CONFIG_KCOV */
static inline void usbip_kcov_handle_init(struct usbip_device *ud) { }
static inline void usbip_kcov_remote_start(struct usbip_device *ud) { }
static inline void usbip_kcov_remote_stop(void) { }
#endif /* CONFIG_KCOV */
#endif /* __USBIP_COMMON_H */
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