Merge tag 'to-linus' of git://github.com/rustyrussell/linux

* tag 'to-linus' of git://github.com/rustyrussell/linux: (24 commits)
  lguest: Make sure interrupt is allocated ok by lguest_setup_irq
  lguest: move the lguest tool to the tools directory
  lguest: switch segment-voodoo-numbers to readable symbols
  virtio: balloon: Add freeze, restore handlers to support S4
  virtio: balloon: Move vq initialization into separate function
  virtio: net: Add freeze, restore handlers to support S4
  virtio: net: Move vq and vq buf removal into separate function
  virtio: net: Move vq initialization into separate function
  virtio: blk: Add freeze, restore handlers to support S4
  virtio: blk: Move vq initialization to separate function
  virtio: console: Disable callbacks for virtqueues at start of S4 freeze
  virtio: console: Add freeze and restore handlers to support S4
  virtio: console: Move vq and vq buf removal into separate functions
  virtio: pci: add PM notification handlers for restore, freeze, thaw, poweroff
  virtio: pci: switch to new PM API
  virtio_blk: fix config handler race
  virtio: add debugging if driver doesn't kick.
  virtio: expose added descriptors immediately.
  virtio: avoid modulus operation.
  virtio: support unlocked queue kick
  ...

2 files changed, 110 insertions, 32 deletions

diff --git a/drivers/char/hw_random/virtio-rng.c b/drivers/char/hw_random/virtio-rng.c
index fd699ccecf5b..723725bbb96b 100644
--- a/drivers/char/hw_random/virtio-rng.c
+++ b/drivers/char/hw_random/virtio-rng.c
@@ -47,7 +47,7 @@ static void register_buffer(u8 *buf, size_t size)
 	sg_init_one(&sg, buf, size);
 
 	/* There should always be room for one buffer. */
-	if (virtqueue_add_buf(vq, &sg, 0, 1, buf) < 0)
+	if (virtqueue_add_buf(vq, &sg, 0, 1, buf, GFP_KERNEL) < 0)
 		BUG();
 
 	virtqueue_kick(vq);
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 8e3c46d67cb3..b58b56187065 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -392,7 +392,7 @@ static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf)
 
 	sg_init_one(sg, buf->buf, buf->size);
 
-	ret = virtqueue_add_buf(vq, sg, 0, 1, buf);
+	ret = virtqueue_add_buf(vq, sg, 0, 1, buf, GFP_ATOMIC);
 	virtqueue_kick(vq);
 	return ret;
 }
@@ -457,7 +457,7 @@ static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id,
 	vq = portdev->c_ovq;
 
 	sg_init_one(sg, &cpkt, sizeof(cpkt));
-	if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt) >= 0) {
+	if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt, GFP_ATOMIC) >= 0) {
 		virtqueue_kick(vq);
 		while (!virtqueue_get_buf(vq, &len))
 			cpu_relax();
@@ -506,7 +506,7 @@ static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count,
 	reclaim_consumed_buffers(port);
 
 	sg_init_one(sg, in_buf, in_count);
-	ret = virtqueue_add_buf(out_vq, sg, 1, 0, in_buf);
+	ret = virtqueue_add_buf(out_vq, sg, 1, 0, in_buf, GFP_ATOMIC);
 
 	/* Tell Host to go! */
 	virtqueue_kick(out_vq);
@@ -1271,6 +1271,20 @@ static void remove_port(struct kref *kref)
 	kfree(port);
 }
 
+static void remove_port_data(struct port *port)
+{
+	struct port_buffer *buf;
+
+	/* Remove unused data this port might have received. */
+	discard_port_data(port);
+
+	reclaim_consumed_buffers(port);
+
+	/* Remove buffers we queued up for the Host to send us data in. */
+	while ((buf = virtqueue_detach_unused_buf(port->in_vq)))
+		free_buf(buf);
+}
+
 /*
  * Port got unplugged.  Remove port from portdev's list and drop the
  * kref reference.  If no userspace has this port opened, it will
@@ -1278,8 +1292,6 @@ static void remove_port(struct kref *kref)
  */
 static void unplug_port(struct port *port)
 {
-	struct port_buffer *buf;
-
 	spin_lock_irq(&port->portdev->ports_lock);
 	list_del(&port->list);
 	spin_unlock_irq(&port->portdev->ports_lock);
@@ -1300,14 +1312,7 @@ static void unplug_port(struct port *port)
 		hvc_remove(port->cons.hvc);
 	}
 
-	/* Remove unused data this port might have received. */
-	discard_port_data(port);
-
-	reclaim_consumed_buffers(port);
-
-	/* Remove buffers we queued up for the Host to send us data in. */
-	while ((buf = virtqueue_detach_unused_buf(port->in_vq)))
-		free_buf(buf);
+	remove_port_data(port);
 
 	/*
 	 * We should just assume the device itself has gone off --
@@ -1659,6 +1664,28 @@ static const struct file_operations portdev_fops = {
 	.owner = THIS_MODULE,
 };
 
+static void remove_vqs(struct ports_device *portdev)
+{
+	portdev->vdev->config->del_vqs(portdev->vdev);
+	kfree(portdev->in_vqs);
+	kfree(portdev->out_vqs);
+}
+
+static void remove_controlq_data(struct ports_device *portdev)
+{
+	struct port_buffer *buf;
+	unsigned int len;
+
+	if (!use_multiport(portdev))
+		return;
+
+	while ((buf = virtqueue_get_buf(portdev->c_ivq, &len)))
+		free_buf(buf);
+
+	while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq)))
+		free_buf(buf);
+}
+
 /*
  * Once we're further in boot, we get probed like any other virtio
  * device.
@@ -1764,9 +1791,7 @@ free_vqs:
 	/* The host might want to notify mgmt sw about device add failure */
 	__send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID,
 			   VIRTIO_CONSOLE_DEVICE_READY, 0);
-	vdev->config->del_vqs(vdev);
-	kfree(portdev->in_vqs);
-	kfree(portdev->out_vqs);
+	remove_vqs(portdev);
 free_chrdev:
 	unregister_chrdev(portdev->chr_major, "virtio-portsdev");
 free:
@@ -1804,21 +1829,8 @@ static void virtcons_remove(struct virtio_device *vdev)
 	 * have to just stop using the port, as the vqs are going
 	 * away.
 	 */
-	if (use_multiport(portdev)) {
-		struct port_buffer *buf;
-		unsigned int len;
-
-		while ((buf = virtqueue_get_buf(portdev->c_ivq, &len)))
-			free_buf(buf);
-
-		while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq)))
-			free_buf(buf);
-	}
-
-	vdev->config->del_vqs(vdev);
-	kfree(portdev->in_vqs);
-	kfree(portdev->out_vqs);
-
+	remove_controlq_data(portdev);
+	remove_vqs(portdev);
 	kfree(portdev);
 }
 
@@ -1832,6 +1844,68 @@ static unsigned int features[] = {
 	VIRTIO_CONSOLE_F_MULTIPORT,
 };
 
+#ifdef CONFIG_PM
+static int virtcons_freeze(struct virtio_device *vdev)
+{
+	struct ports_device *portdev;
+	struct port *port;
+
+	portdev = vdev->priv;
+
+	vdev->config->reset(vdev);
+
+	virtqueue_disable_cb(portdev->c_ivq);
+	cancel_work_sync(&portdev->control_work);
+	/*
+	 * Once more: if control_work_handler() was running, it would
+	 * enable the cb as the last step.
+	 */
+	virtqueue_disable_cb(portdev->c_ivq);
+	remove_controlq_data(portdev);
+
+	list_for_each_entry(port, &portdev->ports, list) {
+		virtqueue_disable_cb(port->in_vq);
+		virtqueue_disable_cb(port->out_vq);
+		/*
+		 * We'll ask the host later if the new invocation has
+		 * the port opened or closed.
+		 */
+		port->host_connected = false;
+		remove_port_data(port);
+	}
+	remove_vqs(portdev);
+
+	return 0;
+}
+
+static int virtcons_restore(struct virtio_device *vdev)
+{
+	struct ports_device *portdev;
+	struct port *port;
+	int ret;
+
+	portdev = vdev->priv;
+
+	ret = init_vqs(portdev);
+	if (ret)
+		return ret;
+
+	if (use_multiport(portdev))
+		fill_queue(portdev->c_ivq, &portdev->cvq_lock);
+
+	list_for_each_entry(port, &portdev->ports, list) {
+		port->in_vq = portdev->in_vqs[port->id];
+		port->out_vq = portdev->out_vqs[port->id];
+
+		fill_queue(port->in_vq, &port->inbuf_lock);
+
+		/* Get port open/close status on the host */
+		send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1);
+	}
+	return 0;
+}
+#endif
+
 static struct virtio_driver virtio_console = {
 	.feature_table = features,
 	.feature_table_size = ARRAY_SIZE(features),
@@ -1841,6 +1915,10 @@ static struct virtio_driver virtio_console = {
 	.probe =	virtcons_probe,
 	.remove =	virtcons_remove,
 	.config_changed = config_intr,
+#ifdef CONFIG_PM
+	.freeze =	virtcons_freeze,
+	.restore =	virtcons_restore,
+#endif
 };
 
 static int __init init(void)