mirror of https://gitee.com/openkylin/linux.git
Merge branch 'xen/dev-evtchn' into upstream/evtchn
* xen/dev-evtchn: xen/evtchn: add missing static xen/evtchn: Fix name of Xen event-channel device xen/evtchn: don't do unbind_from_irqhandler under spinlock xen/evtchn: remove spurious barrier xen/evtchn: ports start enabled xen/evtchn: dynamically allocate port_user array xen/evtchn: track enabled state for each port
This commit is contained in:
Jeremy Fitzhardinge
commit
67cb405609
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@ -69,20 +69,51 @@ struct per_user_data {
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const char *name;
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};
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/* Who's bound to each port? */
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static struct per_user_data *port_user[NR_EVENT_CHANNELS];
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/*
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* Who's bound to each port? This is logically an array of struct
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* per_user_data *, but we encode the current enabled-state in bit 0.
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*/
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static unsigned long *port_user;
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static DEFINE_SPINLOCK(port_user_lock); /* protects port_user[] and ring_prod */
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irqreturn_t evtchn_interrupt(int irq, void *data)
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static inline struct per_user_data *get_port_user(unsigned port)
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{
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return (struct per_user_data *)(port_user[port] & ~1);
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}
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static inline void set_port_user(unsigned port, struct per_user_data *u)
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{
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port_user[port] = (unsigned long)u;
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}
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static inline bool get_port_enabled(unsigned port)
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{
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return port_user[port] & 1;
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}
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static inline void set_port_enabled(unsigned port, bool enabled)
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{
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if (enabled)
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port_user[port] |= 1;
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else
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port_user[port] &= ~1;
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}
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static irqreturn_t evtchn_interrupt(int irq, void *data)
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{
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unsigned int port = (unsigned long)data;
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struct per_user_data *u;
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spin_lock(&port_user_lock);
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u = port_user[port];
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u = get_port_user(port);
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WARN(!get_port_enabled(port),
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"Interrupt for port %d, but apparently not enabled; per-user %p\n",
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port, u);
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disable_irq_nosync(irq);
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set_port_enabled(port, false);
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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)] = port;
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@ -92,9 +123,8 @@ irqreturn_t evtchn_interrupt(int irq, void *data)
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kill_fasync(&u->evtchn_async_queue,
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SIGIO, POLL_IN);
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}
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} else {
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} else
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u->ring_overflow = 1;
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}
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spin_unlock(&port_user_lock);
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@ -198,9 +228,18 @@ static ssize_t evtchn_write(struct file *file, const char __user *buf,
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goto out;
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spin_lock_irq(&port_user_lock);
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for (i = 0; i < (count/sizeof(evtchn_port_t)); i++)
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if ((kbuf[i] < NR_EVENT_CHANNELS) && (port_user[kbuf[i]] == u))
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enable_irq(irq_from_evtchn(kbuf[i]));
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for (i = 0; i < (count/sizeof(evtchn_port_t)); i++) {
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unsigned port = kbuf[i];
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if (port < NR_EVENT_CHANNELS &&
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get_port_user(port) == u &&
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!get_port_enabled(port)) {
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set_port_enabled(port, true);
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enable_irq(irq_from_evtchn(port));
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}
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}
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spin_unlock_irq(&port_user_lock);
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rc = count;
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@ -222,8 +261,9 @@ static int evtchn_bind_to_user(struct per_user_data *u, int port)
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* interrupt handler yet, and our caller has already
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* serialized bind operations.)
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*/
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BUG_ON(port_user[port] != NULL);
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port_user[port] = u;
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BUG_ON(get_port_user(port) != NULL);
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set_port_user(port, u);
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set_port_enabled(port, true); /* start enabled */
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rc = bind_evtchn_to_irqhandler(port, evtchn_interrupt, IRQF_DISABLED,
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u->name, (void *)(unsigned long)port);
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@ -239,10 +279,7 @@ static void evtchn_unbind_from_user(struct per_user_data *u, int port)
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unbind_from_irqhandler(irq, (void *)(unsigned long)port);
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/* make sure we unbind the irq handler before clearing the port */
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barrier();
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port_user[port] = NULL;
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set_port_user(port, NULL);
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}
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static long evtchn_ioctl(struct file *file,
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@ -333,15 +370,17 @@ static long evtchn_ioctl(struct file *file,
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spin_lock_irq(&port_user_lock);
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rc = -ENOTCONN;
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if (port_user[unbind.port] != u) {
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if (get_port_user(unbind.port) != u) {
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spin_unlock_irq(&port_user_lock);
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break;
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}
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evtchn_unbind_from_user(u, unbind.port);
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disable_irq(irq_from_evtchn(unbind.port));
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spin_unlock_irq(&port_user_lock);
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evtchn_unbind_from_user(u, unbind.port);
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rc = 0;
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break;
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}
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@ -355,7 +394,7 @@ static long evtchn_ioctl(struct file *file,
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if (notify.port >= NR_EVENT_CHANNELS) {
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rc = -EINVAL;
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} else if (port_user[notify.port] != u) {
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} else if (get_port_user(notify.port) != u) {
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rc = -ENOTCONN;
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} else {
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notify_remote_via_evtchn(notify.port);
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@ -444,14 +483,21 @@ static int evtchn_release(struct inode *inode, struct file *filp)
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free_page((unsigned long)u->ring);
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for (i = 0; i < NR_EVENT_CHANNELS; i++) {
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if (port_user[i] != u)
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if (get_port_user(i) != u)
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continue;
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evtchn_unbind_from_user(port_user[i], i);
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disable_irq(irq_from_evtchn(i));
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}
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spin_unlock_irq(&port_user_lock);
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for (i = 0; i < NR_EVENT_CHANNELS; i++) {
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if (get_port_user(i) != u)
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continue;
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evtchn_unbind_from_user(get_port_user(i), i);
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}
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kfree(u->name);
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kfree(u);
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@ -472,7 +518,7 @@ static const struct file_operations evtchn_fops = {
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static struct miscdevice evtchn_miscdev = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "evtchn",
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.name = "xen/evtchn",
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.fops = &evtchn_fops,
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};
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static int __init evtchn_init(void)
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@ -482,8 +528,11 @@ static int __init evtchn_init(void)
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if (!xen_domain())
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return -ENODEV;
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port_user = kcalloc(NR_EVENT_CHANNELS, sizeof(*port_user), GFP_KERNEL);
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if (port_user == NULL)
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return -ENOMEM;
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spin_lock_init(&port_user_lock);
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memset(port_user, 0, sizeof(port_user));
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/* Create '/dev/misc/evtchn'. */
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err = misc_register(&evtchn_miscdev);
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@ -499,6 +548,9 @@ static int __init evtchn_init(void)
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static void __exit evtchn_cleanup(void)
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{
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kfree(port_user);
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port_user = NULL;
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misc_deregister(&evtchn_miscdev);
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}
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