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Diffstat (limited to '')
| -rw-r--r-- | drivers/usb/usbip/usbip_common.h | 373 |
1 files changed, 373 insertions, 0 deletions
diff --git a/drivers/usb/usbip/usbip_common.h b/drivers/usb/usbip/usbip_common.h new file mode 100644 index 000000000..d8cbd2dfc --- /dev/null +++ b/drivers/usb/usbip/usbip_common.h @@ -0,0 +1,373 @@ +// 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; \ +}) + +#define kthread_stop_put(k) \ + do { \ + kthread_stop(k); \ + put_task_struct(k); \ + } while (0) + +/* 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 */ |