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Input: evdev - Add the events() callback
By sending a full frame of events at the same time, the irqsoff latency at heavy load is brought down from 200 us to 100 us. Cc: Daniel Kurtz <djkurtz@chromium.org> Tested-by: Benjamin Tissoires <benjamin.tissoires@enac.fr> Tested-by: Ping Cheng <pingc@wacom.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
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4369c64c79
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1 changed files with 60 additions and 34 deletions
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@ -54,16 +54,9 @@ struct evdev_client {
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static struct evdev *evdev_table[EVDEV_MINORS];
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static DEFINE_MUTEX(evdev_table_mutex);
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static void evdev_pass_event(struct evdev_client *client,
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struct input_event *event,
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ktime_t mono, ktime_t real)
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static void __pass_event(struct evdev_client *client,
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const struct input_event *event)
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{
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event->time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ?
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mono : real);
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/* Interrupts are disabled, just acquire the lock. */
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spin_lock(&client->buffer_lock);
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client->buffer[client->head++] = *event;
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client->head &= client->bufsize - 1;
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@ -86,8 +79,63 @@ static void evdev_pass_event(struct evdev_client *client,
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client->packet_head = client->head;
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kill_fasync(&client->fasync, SIGIO, POLL_IN);
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}
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}
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static void evdev_pass_values(struct evdev_client *client,
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const struct input_value *vals, unsigned int count,
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ktime_t mono, ktime_t real)
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{
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struct evdev *evdev = client->evdev;
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const struct input_value *v;
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struct input_event event;
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bool wakeup = false;
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event.time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ?
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mono : real);
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/* Interrupts are disabled, just acquire the lock. */
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spin_lock(&client->buffer_lock);
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for (v = vals; v != vals + count; v++) {
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event.type = v->type;
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event.code = v->code;
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event.value = v->value;
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__pass_event(client, &event);
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if (v->type == EV_SYN && v->code == SYN_REPORT)
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wakeup = true;
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}
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spin_unlock(&client->buffer_lock);
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if (wakeup)
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wake_up_interruptible(&evdev->wait);
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}
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/*
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* Pass incoming events to all connected clients.
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*/
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static void evdev_events(struct input_handle *handle,
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const struct input_value *vals, unsigned int count)
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{
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struct evdev *evdev = handle->private;
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struct evdev_client *client;
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ktime_t time_mono, time_real;
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time_mono = ktime_get();
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time_real = ktime_sub(time_mono, ktime_get_monotonic_offset());
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rcu_read_lock();
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client = rcu_dereference(evdev->grab);
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if (client)
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evdev_pass_values(client, vals, count, time_mono, time_real);
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else
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list_for_each_entry_rcu(client, &evdev->client_list, node)
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evdev_pass_values(client, vals, count,
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time_mono, time_real);
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rcu_read_unlock();
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}
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/*
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@ -96,32 +144,9 @@ static void evdev_pass_event(struct evdev_client *client,
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static void evdev_event(struct input_handle *handle,
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unsigned int type, unsigned int code, int value)
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{
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struct evdev *evdev = handle->private;
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struct evdev_client *client;
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struct input_event event;
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ktime_t time_mono, time_real;
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struct input_value vals[] = { { type, code, value } };
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time_mono = ktime_get();
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time_real = ktime_sub(time_mono, ktime_get_monotonic_offset());
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event.type = type;
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event.code = code;
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event.value = value;
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rcu_read_lock();
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client = rcu_dereference(evdev->grab);
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if (client)
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evdev_pass_event(client, &event, time_mono, time_real);
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else
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list_for_each_entry_rcu(client, &evdev->client_list, node)
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evdev_pass_event(client, &event, time_mono, time_real);
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rcu_read_unlock();
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if (type == EV_SYN && code == SYN_REPORT)
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wake_up_interruptible(&evdev->wait);
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evdev_events(handle, vals, 1);
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}
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static int evdev_fasync(int fd, struct file *file, int on)
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@ -1050,6 +1075,7 @@ MODULE_DEVICE_TABLE(input, evdev_ids);
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static struct input_handler evdev_handler = {
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.event = evdev_event,
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.events = evdev_events,
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.connect = evdev_connect,
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.disconnect = evdev_disconnect,
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.fops = &evdev_fops,
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