4d53ee84fa
The user-space event channel device is used by applications to receive and send event channel interrupts. This device is based on the Linux evtchn device. Sponsored by: Citrix Systems R&D xen/evtchn/evtchn_dev.c: - Remove the old event channel device, which was already disabled in the build system. dev/xen/evtchn/evtchn_dev.c: - Import a new event channel device based on the one present in Linux. - This device allows the following operations: - Bind VIRQ event channels (ioctl). - Bind regular event channels (ioctl). - Create and bind new event channels (ioctl). - Unbind event channels (ioctl). - Send notifications to event channels (ioctl). - Reset the device shared memory ring (ioctl). - Unmask event channels (write). - Receive event channel upcalls (read). - The new code is MP safe, and can be used concurrently. conf/files: - Add the new device to the build system.
608 lines
14 KiB
C
608 lines
14 KiB
C
/******************************************************************************
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* evtchn.c
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*
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* Driver for receiving and demuxing event-channel signals.
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*
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* Copyright (c) 2004-2005, K A Fraser
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* Multi-process extensions Copyright (c) 2004, Steven Smith
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* FreeBSD port Copyright (c) 2014, Roger Pau Monné
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* Fetched from git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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* File: drivers/xen/evtchn.c
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* Git commit: 0dc0064add422bc0ef5165ebe9ece3052bbd457d
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/uio.h>
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#include <sys/bus.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sx.h>
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#include <sys/selinfo.h>
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#include <sys/poll.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/ioccom.h>
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#include <sys/rman.h>
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#include <sys/tree.h>
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#include <sys/module.h>
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#include <sys/filio.h>
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#include <sys/vnode.h>
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#include <machine/intr_machdep.h>
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#include <machine/xen/synch_bitops.h>
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#include <xen/xen-os.h>
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#include <xen/evtchn.h>
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#include <xen/xen_intr.h>
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#include <xen/evtchn/evtchnvar.h>
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MALLOC_DEFINE(M_EVTCHN, "evtchn_dev", "Xen event channel user-space device");
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struct user_evtchn;
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static int evtchn_cmp(struct user_evtchn *u1, struct user_evtchn *u2);
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RB_HEAD(evtchn_tree, user_evtchn);
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struct per_user_data {
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struct mtx bind_mutex; /* serialize bind/unbind operations */
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struct evtchn_tree evtchns;
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/* Notification ring, accessed via /dev/xen/evtchn. */
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#define EVTCHN_RING_SIZE (PAGE_SIZE / sizeof(evtchn_port_t))
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#define EVTCHN_RING_MASK(_i) ((_i)&(EVTCHN_RING_SIZE-1))
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evtchn_port_t *ring;
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unsigned int ring_cons, ring_prod, ring_overflow;
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struct sx ring_cons_mutex; /* protect against concurrent readers */
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struct mtx ring_prod_mutex; /* product against concurrent interrupts */
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struct selinfo ev_rsel;
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};
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struct user_evtchn {
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RB_ENTRY(user_evtchn) node;
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struct per_user_data *user;
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evtchn_port_t port;
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xen_intr_handle_t handle;
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bool enabled;
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};
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RB_GENERATE_STATIC(evtchn_tree, user_evtchn, node, evtchn_cmp);
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static device_t evtchn_dev;
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static d_read_t evtchn_read;
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static d_write_t evtchn_write;
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static d_ioctl_t evtchn_ioctl;
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static d_poll_t evtchn_poll;
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static d_open_t evtchn_open;
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static void evtchn_release(void *arg);
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static struct cdevsw evtchn_devsw = {
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.d_version = D_VERSION,
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.d_open = evtchn_open,
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.d_read = evtchn_read,
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.d_write = evtchn_write,
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.d_ioctl = evtchn_ioctl,
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.d_poll = evtchn_poll,
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.d_name = "evtchn",
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};
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/*------------------------- Red-black tree helpers ---------------------------*/
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static int
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evtchn_cmp(struct user_evtchn *u1, struct user_evtchn *u2)
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{
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return (u1->port - u2->port);
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}
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static struct user_evtchn *
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find_evtchn(struct per_user_data *u, evtchn_port_t port)
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{
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struct user_evtchn tmp = {
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.port = port,
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};
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return (RB_FIND(evtchn_tree, &u->evtchns, &tmp));
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}
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/*--------------------------- Interrupt handlers -----------------------------*/
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static int
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evtchn_filter(void *arg)
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{
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struct user_evtchn *evtchn;
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evtchn = arg;
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if (!evtchn->enabled && bootverbose) {
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device_printf(evtchn_dev,
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"Received upcall for disabled event channel %d\n",
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evtchn->port);
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}
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evtchn_mask_port(evtchn->port);
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evtchn->enabled = false;
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return (FILTER_SCHEDULE_THREAD);
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}
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static void
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evtchn_interrupt(void *arg)
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{
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struct user_evtchn *evtchn;
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struct per_user_data *u;
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evtchn = arg;
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u = evtchn->user;
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/*
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* Protect against concurrent events using this handler
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* on different CPUs.
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*/
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mtx_lock(&u->ring_prod_mutex);
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if ((u->ring_prod - u->ring_cons) < EVTCHN_RING_SIZE) {
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u->ring[EVTCHN_RING_MASK(u->ring_prod)] = evtchn->port;
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wmb(); /* Ensure ring contents visible */
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if (u->ring_cons == u->ring_prod++) {
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wakeup(u);
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selwakeup(&u->ev_rsel);
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}
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} else
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u->ring_overflow = 1;
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mtx_unlock(&u->ring_prod_mutex);
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}
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/*------------------------- Character device methods -------------------------*/
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static int
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evtchn_open(struct cdev *dev, int flag, int otyp, struct thread *td)
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{
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struct per_user_data *u;
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int error;
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u = malloc(sizeof(*u), M_EVTCHN, M_WAITOK | M_ZERO);
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u->ring = malloc(PAGE_SIZE, M_EVTCHN, M_WAITOK | M_ZERO);
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/* Initialize locks */
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mtx_init(&u->bind_mutex, "evtchn_bind_mutex", NULL, MTX_DEF);
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sx_init(&u->ring_cons_mutex, "evtchn_ringc_sx");
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mtx_init(&u->ring_prod_mutex, "evtchn_ringp_mutex", NULL, MTX_DEF);
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/* Initialize red-black tree. */
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RB_INIT(&u->evtchns);
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/* Assign the allocated per_user_data to this open instance. */
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error = devfs_set_cdevpriv(u, evtchn_release);
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if (error != 0) {
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mtx_destroy(&u->bind_mutex);
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mtx_destroy(&u->ring_prod_mutex);
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sx_destroy(&u->ring_cons_mutex);
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free(u->ring, M_EVTCHN);
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free(u, M_EVTCHN);
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}
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return (error);
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}
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static void
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evtchn_release(void *arg)
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{
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struct per_user_data *u;
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struct user_evtchn *evtchn, *tmp;
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u = arg;
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seldrain(&u->ev_rsel);
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RB_FOREACH_SAFE(evtchn, evtchn_tree, &u->evtchns, tmp) {
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xen_intr_unbind(&evtchn->handle);
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RB_REMOVE(evtchn_tree, &u->evtchns, evtchn);
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free(evtchn, M_EVTCHN);
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}
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mtx_destroy(&u->bind_mutex);
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mtx_destroy(&u->ring_prod_mutex);
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sx_destroy(&u->ring_cons_mutex);
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free(u->ring, M_EVTCHN);
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free(u, M_EVTCHN);
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}
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static int
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evtchn_read(struct cdev *dev, struct uio *uio, int ioflag)
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{
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int error, count;
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unsigned int c, p, bytes1 = 0, bytes2 = 0;
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struct per_user_data *u;
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error = devfs_get_cdevpriv((void **)&u);
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if (error != 0)
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return (EINVAL);
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/* Whole number of ports. */
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count = uio->uio_resid;
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count &= ~(sizeof(evtchn_port_t)-1);
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if (count == 0)
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return (0);
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if (count > PAGE_SIZE)
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count = PAGE_SIZE;
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sx_xlock(&u->ring_cons_mutex);
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for (;;) {
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error = EFBIG;
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if (u->ring_overflow)
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goto unlock_out;
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c = u->ring_cons;
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p = u->ring_prod;
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if (c != p)
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break;
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if (ioflag & IO_NDELAY) {
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sx_xunlock(&u->ring_cons_mutex);
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return (EWOULDBLOCK);
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}
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error = sx_sleep(u, &u->ring_cons_mutex, PCATCH, "evtchw", 0);
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if ((error != 0) && (error != EWOULDBLOCK))
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return (error);
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}
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/* Byte lengths of two chunks. Chunk split (if any) is at ring wrap. */
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if (((c ^ p) & EVTCHN_RING_SIZE) != 0) {
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bytes1 = (EVTCHN_RING_SIZE - EVTCHN_RING_MASK(c)) *
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sizeof(evtchn_port_t);
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bytes2 = EVTCHN_RING_MASK(p) * sizeof(evtchn_port_t);
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} else {
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bytes1 = (p - c) * sizeof(evtchn_port_t);
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bytes2 = 0;
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}
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/* Truncate chunks according to caller's maximum byte count. */
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if (bytes1 > count) {
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bytes1 = count;
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bytes2 = 0;
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} else if ((bytes1 + bytes2) > count) {
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bytes2 = count - bytes1;
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}
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error = EFAULT;
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rmb(); /* Ensure that we see the port before we copy it. */
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if (uiomove(&u->ring[EVTCHN_RING_MASK(c)], bytes1, uio) ||
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((bytes2 != 0) && uiomove(&u->ring[0], bytes2, uio)))
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goto unlock_out;
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u->ring_cons += (bytes1 + bytes2) / sizeof(evtchn_port_t);
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error = 0;
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unlock_out:
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sx_xunlock(&u->ring_cons_mutex);
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return (error);
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}
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static int
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evtchn_write(struct cdev *dev, struct uio *uio, int ioflag)
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{
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int error, i, count;
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evtchn_port_t *kbuf;
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struct per_user_data *u;
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error = devfs_get_cdevpriv((void **)&u);
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if (error != 0)
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return (EINVAL);
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kbuf = malloc(PAGE_SIZE, M_EVTCHN, M_WAITOK);
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if (kbuf == NULL)
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return (ENOMEM);
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count = uio->uio_resid;
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/* Whole number of ports. */
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count &= ~(sizeof(evtchn_port_t)-1);
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error = 0;
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if (count == 0)
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goto out;
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if (count > PAGE_SIZE)
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count = PAGE_SIZE;
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error = uiomove(kbuf, count, uio);
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if (error != 0)
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goto out;
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mtx_lock(&u->bind_mutex);
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for (i = 0; i < (count/sizeof(evtchn_port_t)); i++) {
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evtchn_port_t port = kbuf[i];
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struct user_evtchn *evtchn;
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evtchn = find_evtchn(u, port);
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if (evtchn && !evtchn->enabled) {
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evtchn->enabled = true;
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evtchn_unmask_port(evtchn->port);
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}
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}
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mtx_unlock(&u->bind_mutex);
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error = 0;
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out:
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free(kbuf, M_EVTCHN);
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return (error);
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}
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static inline int
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evtchn_bind_user_port(struct per_user_data *u, struct user_evtchn *evtchn)
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{
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int error;
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evtchn->port = xen_intr_port(evtchn->handle);
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evtchn->user = u;
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evtchn->enabled = true;
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mtx_lock(&u->bind_mutex);
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RB_INSERT(evtchn_tree, &u->evtchns, evtchn);
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mtx_unlock(&u->bind_mutex);
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error = xen_intr_add_handler(evtchn_dev, evtchn_filter,
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evtchn_interrupt, evtchn, INTR_TYPE_MISC | INTR_MPSAFE,
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evtchn->handle);
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if (error != 0) {
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xen_intr_unbind(&evtchn->handle);
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mtx_lock(&u->bind_mutex);
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RB_REMOVE(evtchn_tree, &u->evtchns, evtchn);
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mtx_unlock(&u->bind_mutex);
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free(evtchn, M_EVTCHN);
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}
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return (error);
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}
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static int
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evtchn_ioctl(struct cdev *dev, unsigned long cmd, caddr_t arg,
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int mode, struct thread *td __unused)
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{
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struct per_user_data *u;
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int error;
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error = devfs_get_cdevpriv((void **)&u);
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if (error != 0)
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return (EINVAL);
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switch (cmd) {
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case IOCTL_EVTCHN_BIND_VIRQ: {
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struct ioctl_evtchn_bind_virq *bind;
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struct user_evtchn *evtchn;
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evtchn = malloc(sizeof(*evtchn), M_EVTCHN, M_WAITOK | M_ZERO);
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bind = (struct ioctl_evtchn_bind_virq *)arg;
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error = xen_intr_bind_virq(evtchn_dev, bind->virq, 0,
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NULL, NULL, NULL, 0, &evtchn->handle);
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if (error != 0) {
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free(evtchn, M_EVTCHN);
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break;
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}
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error = evtchn_bind_user_port(u, evtchn);
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if (error != 0)
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break;
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bind->port = evtchn->port;
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break;
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}
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case IOCTL_EVTCHN_BIND_INTERDOMAIN: {
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struct ioctl_evtchn_bind_interdomain *bind;
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struct user_evtchn *evtchn;
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evtchn = malloc(sizeof(*evtchn), M_EVTCHN, M_WAITOK | M_ZERO);
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bind = (struct ioctl_evtchn_bind_interdomain *)arg;
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error = xen_intr_bind_remote_port(evtchn_dev,
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bind->remote_domain, bind->remote_port, NULL,
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NULL, NULL, 0, &evtchn->handle);
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if (error != 0) {
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free(evtchn, M_EVTCHN);
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break;
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}
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error = evtchn_bind_user_port(u, evtchn);
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if (error != 0)
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break;
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bind->port = evtchn->port;
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break;
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}
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case IOCTL_EVTCHN_BIND_UNBOUND_PORT: {
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struct ioctl_evtchn_bind_unbound_port *bind;
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struct user_evtchn *evtchn;
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evtchn = malloc(sizeof(*evtchn), M_EVTCHN, M_WAITOK | M_ZERO);
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bind = (struct ioctl_evtchn_bind_unbound_port *)arg;
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error = xen_intr_alloc_and_bind_local_port(evtchn_dev,
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bind->remote_domain, NULL, NULL, NULL, 0, &evtchn->handle);
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if (error != 0) {
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free(evtchn, M_EVTCHN);
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break;
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}
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error = evtchn_bind_user_port(u, evtchn);
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if (error != 0)
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break;
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bind->port = evtchn->port;
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break;
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}
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case IOCTL_EVTCHN_UNBIND: {
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struct ioctl_evtchn_unbind *unbind;
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struct user_evtchn *evtchn;
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unbind = (struct ioctl_evtchn_unbind *)arg;
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mtx_lock(&u->bind_mutex);
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evtchn = find_evtchn(u, unbind->port);
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if (evtchn == NULL) {
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error = ENOTCONN;
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break;
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}
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xen_intr_unbind(&evtchn->handle);
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RB_REMOVE(evtchn_tree, &u->evtchns, evtchn);
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mtx_unlock(&u->bind_mutex);
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free(evtchn, M_EVTCHN);
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error = 0;
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break;
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}
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case IOCTL_EVTCHN_NOTIFY: {
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struct ioctl_evtchn_notify *notify;
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struct user_evtchn *evtchn;
|
|
|
|
notify = (struct ioctl_evtchn_notify *)arg;
|
|
|
|
mtx_lock(&u->bind_mutex);
|
|
evtchn = find_evtchn(u, notify->port);
|
|
if (evtchn == NULL) {
|
|
error = ENOTCONN;
|
|
break;
|
|
}
|
|
|
|
xen_intr_signal(evtchn->handle);
|
|
mtx_unlock(&u->bind_mutex);
|
|
error = 0;
|
|
break;
|
|
}
|
|
|
|
case IOCTL_EVTCHN_RESET: {
|
|
/* Initialise the ring to empty. Clear errors. */
|
|
sx_xlock(&u->ring_cons_mutex);
|
|
mtx_lock(&u->ring_prod_mutex);
|
|
u->ring_cons = u->ring_prod = u->ring_overflow = 0;
|
|
mtx_unlock(&u->ring_prod_mutex);
|
|
sx_xunlock(&u->ring_cons_mutex);
|
|
error = 0;
|
|
break;
|
|
}
|
|
|
|
case FIONBIO:
|
|
case FIOASYNC:
|
|
/* Handled in an upper layer */
|
|
error = 0;
|
|
break;
|
|
|
|
default:
|
|
error = ENOTTY;
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
evtchn_poll(struct cdev *dev, int events, struct thread *td)
|
|
{
|
|
struct per_user_data *u;
|
|
int error, mask;
|
|
|
|
error = devfs_get_cdevpriv((void **)&u);
|
|
if (error != 0)
|
|
return (POLLERR);
|
|
|
|
/* we can always write */
|
|
mask = events & (POLLOUT | POLLWRNORM);
|
|
|
|
mtx_lock(&u->ring_prod_mutex);
|
|
if (events & (POLLIN | POLLRDNORM)) {
|
|
if (u->ring_cons != u->ring_prod) {
|
|
mask |= events & (POLLIN | POLLRDNORM);
|
|
} else {
|
|
/* Record that someone is waiting */
|
|
selrecord(td, &u->ev_rsel);
|
|
}
|
|
}
|
|
mtx_unlock(&u->ring_prod_mutex);
|
|
|
|
return (mask);
|
|
}
|
|
|
|
/*------------------ Private Device Attachment Functions --------------------*/
|
|
static void
|
|
evtchn_identify(driver_t *driver, device_t parent)
|
|
{
|
|
|
|
KASSERT((xen_domain()),
|
|
("Trying to attach evtchn device on non Xen domain"));
|
|
|
|
evtchn_dev = BUS_ADD_CHILD(parent, 0, "evtchn", 0);
|
|
if (evtchn_dev == NULL)
|
|
panic("unable to attach evtchn user-space device");
|
|
}
|
|
|
|
static int
|
|
evtchn_probe(device_t dev)
|
|
{
|
|
|
|
device_set_desc(dev, "Xen event channel user-space device");
|
|
return (BUS_PROBE_NOWILDCARD);
|
|
}
|
|
|
|
static int
|
|
evtchn_attach(device_t dev)
|
|
{
|
|
|
|
make_dev_credf(MAKEDEV_ETERNAL, &evtchn_devsw, 0, NULL, UID_ROOT,
|
|
GID_WHEEL, 0600, "xen/evtchn");
|
|
return (0);
|
|
}
|
|
|
|
/*-------------------- Private Device Attachment Data -----------------------*/
|
|
static device_method_t evtchn_methods[] = {
|
|
DEVMETHOD(device_identify, evtchn_identify),
|
|
DEVMETHOD(device_probe, evtchn_probe),
|
|
DEVMETHOD(device_attach, evtchn_attach),
|
|
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
static driver_t evtchn_driver = {
|
|
"evtchn",
|
|
evtchn_methods,
|
|
0,
|
|
};
|
|
|
|
devclass_t evtchn_devclass;
|
|
|
|
DRIVER_MODULE(evtchn, xenpv, evtchn_driver, evtchn_devclass, 0, 0);
|
|
MODULE_DEPEND(evtchn, xenpv, 1, 1, 1);
|