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NetBSD/sys/dev/usb/usbdivar.h
riastradh 87858756ca Factor out HCI-independent xfer completion logic. 
New API for HCI drivers to synchronize hardware completion
interrupts, synchronous aborts, and asynchronous timeouts:

- When submitting an xfer to hardware, call
  usbd_xfer_schedule_timeout(xfer).

- On HCI completion interrupt for xfer completion:

	if (!usbd_xfer_trycomplete(xfer))
		return;		/* timed out or aborted, ignore it */

- In upm_abort methods, call usbd_xfer_abort(xfer).

For HCI drivers that use this API (not needed in drivers that don't,
or for xfers like root intr xfers that don't use it):

- New ubm_abortx method serves role of former *hci_abort_xfer, but
  without any logic for wrangling timeouts/callouts/tasks -- caller
  in usbd_xfer_abort has already handled them.

- New ubm_dying method, returns true if the device is in the process
  of detaching, used by the timeout logic.

Converted and tested:
- ehci
- ohci

Converted and compile-tested:
- ahci (XXX did this ever work?)
- dwc2
- motg (XXX missing usbd_xfer_schedule_timeout in motg_*_start?)
- uhci
- xhci

Not changed:

- slhci (sys/dev/ic/sl811hs.c) -- doesn't use a separate per-xfer
  callout for timeouts (XXX but maybe should?)

- ugenhc (sys/rump/dev/lib/libugenhc/ugenhc.c) -- doesn't manage its
  own transfer timeouts

- vhci -- times transfers out only on detach; could be adapted easily
  if we wanted to use the xfer->ux_callout
2020-02-12 16:01:00 +00:00

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/* $NetBSD: usbdivar.h,v 1.122 2020/02/12 16:01:00 riastradh Exp $ */
/*
* Copyright (c) 1998, 2012 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Lennart Augustsson (lennart@augustsson.net) at
* Carlstedt Research & Technology and Matthew R. Green (mrg@eterna.com.au).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Discussion about locking in the USB code:
*
* The host controller presents one lock at IPL_SOFTUSB (aka IPL_SOFTNET).
*
* List of hardware interface methods, and whether the lock is held
* when each is called by this module:
*
* BUS METHOD LOCK NOTES
* ----------------------- ------- -------------------------
* ubm_open - might want to take lock?
* ubm_softint x
* ubm_dopoll - might want to take lock?
* ubm_allocx -
* ubm_freex -
* ubm_getlock - Called at attach time
* ubm_newdev - Will take lock
ubm_rhctrl
*
* PIPE METHOD LOCK NOTES
* ----------------------- ------- -------------------------
* upm_transfer -
* upm_start - might want to take lock?
* upm_abort x
* upm_close x
* upm_cleartoggle -
* upm_done x
*
* The above semantics are likely to change. Little performance
* evaluation has been done on this code and the locking strategy.
*
* USB functions known to expect the lock taken include (this list is
* probably not exhaustive):
* usb_transfer_complete()
* usb_insert_transfer()
* usb_start_next()
*
*/
#include <sys/callout.h>
#include <sys/mutex.h>
#include <sys/bus.h>
/* From usb_mem.h */
struct usb_dma_block;
typedef struct {
struct usb_dma_block *udma_block;
u_int udma_offs;
} usb_dma_t;
struct usbd_xfer;
struct usbd_pipe;
struct usbd_port;
struct usbd_endpoint {
usb_endpoint_descriptor_t *ue_edesc;
int ue_refcnt;
int ue_toggle;
};
struct usbd_bus_methods {
usbd_status (*ubm_open)(struct usbd_pipe *);
void (*ubm_softint)(void *);
void (*ubm_dopoll)(struct usbd_bus *);
struct usbd_xfer *(*ubm_allocx)(struct usbd_bus *, unsigned int);
void (*ubm_freex)(struct usbd_bus *, struct usbd_xfer *);
void (*ubm_abortx)(struct usbd_xfer *);
bool (*ubm_dying)(struct usbd_bus *);
void (*ubm_getlock)(struct usbd_bus *, kmutex_t **);
usbd_status (*ubm_newdev)(device_t, struct usbd_bus *, int,
int, int, struct usbd_port *);
int (*ubm_rhctrl)(struct usbd_bus *,
usb_device_request_t *, void *, int);
};
struct usbd_pipe_methods {
int (*upm_init)(struct usbd_xfer *);
void (*upm_fini)(struct usbd_xfer *);
usbd_status (*upm_transfer)(struct usbd_xfer *);
usbd_status (*upm_start)(struct usbd_xfer *);
void (*upm_abort)(struct usbd_xfer *);
void (*upm_close)(struct usbd_pipe *);
void (*upm_cleartoggle)(struct usbd_pipe *);
void (*upm_done)(struct usbd_xfer *);
};
struct usbd_tt {
struct usbd_hub *utt_hub;
};
struct usbd_port {
usb_port_status_t up_status;
uint16_t up_power; /* mA of current on port */
uint8_t up_portno;
uint8_t up_restartcnt;
#define USBD_RESTART_MAX 5
uint8_t up_reattach;
struct usbd_device *up_dev; /* Connected device */
struct usbd_device *up_parent; /* The ports hub */
struct usbd_tt *up_tt; /* Transaction translator (if any) */
};
struct usbd_hub {
usbd_status (*uh_explore)(struct usbd_device *hub);
void *uh_hubsoftc;
usb_hub_descriptor_t uh_hubdesc;
struct usbd_port uh_ports[1];
};
/*****/
/* 0, root, and 1->127 */
#define USB_ROOTHUB_INDEX 1
#define USB_TOTAL_DEVICES (USB_MAX_DEVICES + 1)
struct usbd_bus {
/* Filled by HC driver */
void *ub_hcpriv;
int ub_revision; /* USB revision */
#define USBREV_UNKNOWN 0
#define USBREV_PRE_1_0 1
#define USBREV_1_0 2
#define USBREV_1_1 3
#define USBREV_2_0 4
#define USBREV_3_0 5
#define USBREV_3_1 6
#define USBREV_STR { "unknown", "pre 1.0", "1.0", "1.1", "2.0", "3.0", "3.1" }
const struct usbd_bus_methods
*ub_methods;
uint32_t ub_pipesize; /* size of a pipe struct */
bool ub_usedma; /* Does this HC support DMA */
int ub_dmaflags;
bus_dma_tag_t ub_dmatag; /* DMA tag */
/* Filled by usb driver */
kmutex_t *ub_lock;
struct usbd_device *ub_roothub;
uint8_t ub_rhaddr; /* roothub address */
uint8_t ub_rhconf; /* roothub configuration */
struct usbd_device *ub_devices[USB_TOTAL_DEVICES];
kcondvar_t ub_needsexplore_cv;
char ub_needsexplore;/* a hub a signalled a change */
char ub_usepolling;
device_t ub_usbctl;
struct usb_device_stats ub_stats;
void *ub_soft; /* soft interrupt cookie */
};
struct usbd_device {
struct usbd_bus *ud_bus; /* our controller */
struct usbd_pipe *ud_pipe0; /* pipe 0 */
uint8_t ud_addr; /* device addess */
uint8_t ud_config; /* current configuration # */
uint8_t ud_depth; /* distance from root hub */
uint8_t ud_speed; /* low/full/high speed */
uint8_t ud_selfpowered; /* flag for self powered */
uint16_t ud_power; /* mA the device uses */
int16_t ud_langid; /* language for strings */
#define USBD_NOLANG (-1)
usb_event_cookie_t ud_cookie; /* unique connection id */
struct usbd_port *ud_powersrc; /* upstream hub port, or 0 */
struct usbd_device *ud_myhub; /* upstream hub */
struct usbd_port *ud_myhsport; /* closest high speed port */
struct usbd_endpoint ud_ep0; /* for pipe 0 */
usb_endpoint_descriptor_t
ud_ep0desc; /* for pipe 0 */
struct usbd_interface *ud_ifaces; /* array of all interfaces */
usb_device_descriptor_t ud_ddesc; /* device descriptor */
usb_config_descriptor_t *ud_cdesc; /* full config descr */
usb_bos_descriptor_t *ud_bdesc; /* full BOS descr */
const struct usbd_quirks
*ud_quirks; /* device quirks, always set */
struct usbd_hub *ud_hub; /* only if this is a hub */
u_int ud_subdevlen; /* array length of following */
device_t *ud_subdevs; /* sub-devices */
int ud_nifaces_claimed; /* number of ifaces in use */
void *ud_hcpriv;
char *ud_serial; /* serial number, can be NULL */
char *ud_vendor; /* vendor string, can be NULL */
char *ud_product; /* product string can be NULL */
};
struct usbd_interface {
struct usbd_device *ui_dev;
usb_interface_descriptor_t
*ui_idesc;
int ui_index;
int ui_altindex;
struct usbd_endpoint *ui_endpoints;
void *ui_priv;
LIST_HEAD(, usbd_pipe) ui_pipes;
};
struct usbd_pipe {
struct usbd_interface *up_iface;
struct usbd_device *up_dev;
struct usbd_endpoint *up_endpoint;
char up_running;
char up_aborting;
bool up_serialise;
SIMPLEQ_HEAD(, usbd_xfer)
up_queue;
LIST_ENTRY(usbd_pipe) up_next;
struct usb_task up_async_task;
struct usbd_xfer *up_intrxfer; /* used for repeating requests */
char up_repeat;
int up_interval;
uint8_t up_flags;
/* Filled by HC driver. */
const struct usbd_pipe_methods
*up_methods;
};
struct usbd_xfer {
struct usbd_pipe *ux_pipe;
void *ux_priv;
void *ux_buffer;
kcondvar_t ux_cv;
uint32_t ux_length;
uint32_t ux_actlen;
uint16_t ux_flags;
uint32_t ux_timeout;
usbd_status ux_status;
usbd_callback ux_callback;
volatile uint8_t ux_done;
uint8_t ux_state; /* used for DIAGNOSTIC */
#define XFER_FREE 0x46
#define XFER_BUSY 0x55
#define XFER_ONQU 0x9e
/* For control pipe */
usb_device_request_t ux_request;
/* For isoc */
uint16_t *ux_frlengths;
int ux_nframes;
const struct usbd_pipe_methods *ux_methods;
/* For memory allocation and softc */
struct usbd_bus *ux_bus;
usb_dma_t ux_dmabuf;
void *ux_buf;
uint32_t ux_bufsize;
uint8_t ux_rqflags;
#define URQ_REQUEST 0x01
SIMPLEQ_ENTRY(usbd_xfer)
ux_next;
void *ux_hcpriv; /* private use by the HC driver */
struct usb_task ux_aborttask;
struct callout ux_callout;
/*
* Protected by bus lock.
*
* - ux_timeout_set: The timeout is scheduled as a callout or
* usb task, and has not yet acquired the bus lock.
*
* - ux_timeout_reset: The xfer completed, and was resubmitted
* before the callout or task was able to acquire the bus
* lock, so one or the other needs to schedule a new callout.
*/
bool ux_timeout_set;
bool ux_timeout_reset;
};
void usbd_init(void);
void usbd_finish(void);
#if defined(USB_DEBUG)
void usbd_dump_iface(struct usbd_interface *);
void usbd_dump_device(struct usbd_device *);
void usbd_dump_endpoint(struct usbd_endpoint *);
void usbd_dump_queue(struct usbd_pipe *);
void usbd_dump_pipe(struct usbd_pipe *);
#endif
/* Routines from usb_subr.c */
int usbctlprint(void *, const char *);
void usbd_get_device_strings(struct usbd_device *);
void usb_delay_ms_locked(struct usbd_bus *, u_int, kmutex_t *);
void usb_delay_ms(struct usbd_bus *, u_int);
void usbd_delay_ms_locked(struct usbd_device *, u_int, kmutex_t *);
void usbd_delay_ms(struct usbd_device *, u_int);
usbd_status usbd_reset_port(struct usbd_device *, int, usb_port_status_t *);
usbd_status usbd_setup_pipe(struct usbd_device *,
struct usbd_interface *,
struct usbd_endpoint *, int,
struct usbd_pipe **);
usbd_status usbd_setup_pipe_flags(struct usbd_device *,
struct usbd_interface *,
struct usbd_endpoint *, int,
struct usbd_pipe **,
uint8_t);
usbd_status usbd_new_device(device_t, struct usbd_bus *, int, int, int,
struct usbd_port *);
usbd_status usbd_reattach_device(device_t, struct usbd_device *,
int, const int *);
void usbd_remove_device(struct usbd_device *, struct usbd_port *);
usbd_status usbd_fill_iface_data(struct usbd_device *, int, int);
void usb_free_device(struct usbd_device *);
usbd_status usb_insert_transfer(struct usbd_xfer *);
void usb_transfer_complete(struct usbd_xfer *);
int usb_disconnect_port(struct usbd_port *, device_t, int);
void usbd_kill_pipe(struct usbd_pipe *);
usbd_status usbd_attach_roothub(device_t, struct usbd_device *);
usbd_status usbd_probe_and_attach(device_t, struct usbd_device *, int, int);
/* Routines from usb.c */
void usb_needs_explore(struct usbd_device *);
void usb_needs_reattach(struct usbd_device *);
void usb_schedsoftintr(struct usbd_bus *);
static __inline int
usbd_xfer_isread(struct usbd_xfer *xfer)
{
if (xfer->ux_rqflags & URQ_REQUEST)
return xfer->ux_request.bmRequestType & UT_READ;
return xfer->ux_pipe->up_endpoint->ue_edesc->bEndpointAddress &
UE_DIR_IN;
}
static __inline size_t
usb_addr2dindex(int addr)
{
return USB_ROOTHUB_INDEX + addr;
}
/*
* These macros reflect the current locking scheme. They might change.
*/
#define usbd_lock_pipe(p) mutex_enter((p)->up_dev->ud_bus->ub_lock)
#define usbd_unlock_pipe(p) mutex_exit((p)->up_dev->ud_bus->ub_lock)
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