MFNetBSD: uhub.c (1.49), usb.c (1.51), usbdi.h (1.48), usbdivar.h (1.63)
date: 2001/01/21 19:00:06; author: augustss;
Change the operation of the USB event thread. Before it only
performed USB device discovery, now it can also perform (short)
tasks for device drivers that need a process context, but don't
have one. This is not pretty, but better than using busy-wait
in an interrupt context.
This commit is contained in:
joe
parent
dc5c8e8f74
commit
78620e321f
@ -1,4 +1,4 @@
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/* $NetBSD: uhub.c,v 1.48 2000/12/29 01:24:56 augustss Exp $ */
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/* $NetBSD: uhub.c,v 1.49 2001/01/21 19:00:06 augustss Exp $ */
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/* $FreeBSD$ */
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/*
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@ -592,7 +592,8 @@ uhub_intr(usbd_xfer_handle xfer, usbd_private_handle addr, usbd_status status)
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if (status == USBD_STALLED)
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usbd_clear_endpoint_stall_async(sc->sc_ipipe);
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else if (status == USBD_NORMAL_COMPLETION)
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usb_needs_explore(sc->sc_hub->bus);
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usb_needs_explore(sc->sc_hub);
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}
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#if defined(__FreeBSD__)
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@ -1,4 +1,4 @@
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/* $NetBSD: usb.c,v 1.49 2001/01/21 02:39:53 augustss Exp $ */
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/* $NetBSD: usb.c,v 1.51 2001/01/21 19:00:06 augustss Exp $ */
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/* $FreeBSD$ */
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/*
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@ -117,8 +117,11 @@ struct usb_softc {
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usbd_bus_handle sc_bus; /* USB controller */
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struct usbd_port sc_port; /* dummy port for root hub */
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SIMPLEQ_HEAD(, usb_task) sc_tasks;
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struct proc *sc_event_thread;
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struct usb_task sc_exp_task;
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char sc_dying;
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};
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@ -151,7 +154,7 @@ struct cdevsw usb_cdevsw = {
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};
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#endif
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Static usbd_status usb_discover(void *);
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Static void usb_discover(void *);
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Static void usb_create_event_thread(void *);
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Static void usb_event_thread(void *);
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@ -210,6 +213,10 @@ USB_ATTACH(usb)
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sc->sc_bus = aux;
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sc->sc_bus->usbctl = sc;
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sc->sc_port.power = USB_MAX_POWER;
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SIMPLEQ_INIT(&sc->sc_tasks);
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sc->sc_exp_task.fun = usb_discover;
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sc->sc_exp_task.arg = sc;
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#if defined(__FreeBSD__)
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printf("%s", USBDEVNAME(sc->sc_dev));
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@ -310,12 +317,29 @@ usb_create_event_thread(void *arg)
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}
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}
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void
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usb_add_task(usbd_device_handle dev, struct usb_task *task)
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{
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struct usb_softc *sc = dev->bus->usbctl;
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int s;
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s = splusb();
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if (!task->onqueue) {
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DPRINTFN(2,("usb_add_task: sc=%p task=%p\n", sc, task));
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SIMPLEQ_INSERT_TAIL(&sc->sc_tasks, task, next);
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task->onqueue = 1;
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} else
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DPRINTFN(3,("usb_add_task: sc=%p task=%p on q\n", sc, task));
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wakeup(&sc->sc_tasks);
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splx(s);
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}
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void
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usb_event_thread(void *arg)
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{
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struct usb_softc *sc = arg;
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int to;
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int first = 1;
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struct usb_task *task;
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int s;
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#ifdef __FreeBSD__
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mtx_lock(&Giant);
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@ -325,23 +349,24 @@ usb_event_thread(void *arg)
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/* Make sure first discover does something. */
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sc->sc_bus->needs_explore = 1;
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usb_discover(sc);
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config_pending_decr();
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while (!sc->sc_dying) {
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#ifdef USB_DEBUG
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if (usb_noexplore < 2)
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#endif
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usb_discover(sc);
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if (first) {
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config_pending_decr();
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first = 0;
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s = splusb();
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task = SIMPLEQ_FIRST(&sc->sc_tasks);
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if (task == NULL) {
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tsleep(&sc->sc_tasks, PWAIT, "usbevt", 0);
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task = SIMPLEQ_FIRST(&sc->sc_tasks);
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}
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to = hz * 60;
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#ifdef USB_DEBUG
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if (usb_noexplore)
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to = 0;
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#endif
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(void)tsleep(&sc->sc_bus->needs_explore, PWAIT, "usbevt", to);
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DPRINTFN(2,("usb_event_thread: woke up\n"));
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DPRINTFN(2,("usb_event_thread: woke up task=%p\n", task));
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if (task != NULL && !sc->sc_dying) {
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SIMPLEQ_REMOVE_HEAD(&sc->sc_tasks, task, next);
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task->onqueue = 0;
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splx(s);
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task->fun(task->arg);
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} else
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splx(s);
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}
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sc->sc_event_thread = NULL;
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@ -587,7 +612,7 @@ usbpoll(dev_t dev, int events, usb_proc_ptr p)
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}
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/* Explore device tree from the root. */
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usbd_status
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Static void
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usb_discover(void *v)
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{
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struct usb_softc *sc = v;
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@ -597,6 +622,12 @@ usb_discover(void *v)
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int s;
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#endif
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DPRINTFN(2,("usb_discover\n"));
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#ifdef USB_DEBUG
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if (usb_noexplore > 1)
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return;
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#endif
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/*
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* We need mutual exclusion while traversing the device tree,
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* but this is guaranteed since this function is only called
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@ -618,15 +649,14 @@ usb_discover(void *v)
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#if defined(__FreeBSD__)
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splx(s);
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#endif
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return (USBD_NORMAL_COMPLETION);
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}
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void
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usb_needs_explore(usbd_bus_handle bus)
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usb_needs_explore(usbd_device_handle dev)
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{
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bus->needs_explore = 1;
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wakeup(&bus->needs_explore);
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DPRINTFN(2,("usb_needs_explore\n"));
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dev->bus->needs_explore = 1;
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usb_add_task(dev, &dev->bus->usbctl->sc_exp_task);
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}
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/* Called at splusb() */
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@ -776,7 +806,7 @@ usb_detach(device_ptr_t self, int flags)
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/* Kill off event thread. */
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if (sc->sc_event_thread) {
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wakeup(&sc->sc_bus->needs_explore);
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wakeup(&sc->sc_tasks);
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if (tsleep(sc, PWAIT, "usbdet", hz * 60))
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printf("%s: event thread didn't die\n",
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USBDEVNAME(sc->sc_dev));
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@ -1,4 +1,4 @@
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/* $NetBSD: usbdi.h,v 1.47 2001/01/21 02:39:53 augustss Exp $ */
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/* $NetBSD: usbdi.h,v 1.48 2001/01/21 19:00:06 augustss Exp $ */
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/* $FreeBSD$ */
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/*
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@ -177,6 +177,21 @@ usb_endpoint_descriptor_t *usbd_get_endpoint_descriptor
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usbd_status usbd_reload_device_desc(usbd_device_handle);
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/*
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* The usb_task structs form a queue of things to run in the USB event
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* thread. Normally this is just device discovery when a connect/disconnect
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* has been detected. But it may also be used by drivers that need to
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* perform (short) tasks that must have a process context.
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*/
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struct usb_task {
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SIMPLEQ_ENTRY(usb_task) next;
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void (*fun)(void *);
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void *arg;
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char onqueue;
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};
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void usb_add_task(usbd_device_handle dev, struct usb_task *task);
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struct usb_devno {
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u_int16_t ud_vendor;
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u_int16_t ud_product;
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@ -1,4 +1,4 @@
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/* $NetBSD: usbdivar.h,v 1.62 2001/01/21 02:39:53 augustss Exp $ */
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/* $NetBSD: usbdivar.h,v 1.63 2001/01/21 19:00:06 augustss Exp $ */
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/* $FreeBSD$ */
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/*
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@ -249,7 +249,7 @@ void usb_transfer_complete(usbd_xfer_handle xfer);
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void usb_disconnect_port(struct usbd_port *up, device_ptr_t);
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/* Routines from usb.c */
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void usb_needs_explore(usbd_bus_handle);
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void usb_needs_explore(usbd_device_handle);
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void usb_schedsoftintr(struct usbd_bus *);
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/*
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