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Date: Mon, 19 Oct 2009 15:51:46 +0200
From: Oliver Neukum <oliver@...kum.org>
To: David Brownell <dbrownell@...rs.sourceforge.net>,
linux-usb@...r.kernel.org, netdev@...r.kernel.org
Subject: [rft]aggressive power management for cdc-ether
Hi,
this implements usb autosuspend for online cdc-ether devices
that support remote wakeup? What do you think?
Regards
Oliver
--
commit 956c214d266fc1764ceb931b039c7aadded4eb24
Author: Oliver Neukum <oliver@...kum.org>
Date: Mon Oct 19 15:07:54 2009 +0200
usb:usbnet&cdc-ether:full aggressive autosuspend
autosuspend for cdc-ether devices while online if
the device supports remote wakeup
diff --git a/drivers/net/usb/cdc_ether.c b/drivers/net/usb/cdc_ether.c
index 4a6aff5..8ee5bd7 100644
--- a/drivers/net/usb/cdc_ether.c
+++ b/drivers/net/usb/cdc_ether.c
@@ -411,6 +411,12 @@ static int cdc_bind(struct usbnet *dev, struct usb_interface *intf)
return 0;
}
+static int cdc_manage_power(struct usbnet *dev, int on)
+{
+ dev->intf->needs_remote_wakeup = on;
+ return 0;
+}
+
static const struct driver_info cdc_info = {
.description = "CDC Ethernet Device",
.flags = FLAG_ETHER,
@@ -418,6 +424,7 @@ static const struct driver_info cdc_info = {
.bind = cdc_bind,
.unbind = usbnet_cdc_unbind,
.status = cdc_status,
+ .manage_power = cdc_manage_power,
};
/*-------------------------------------------------------------------------*/
@@ -570,6 +577,7 @@ static struct usb_driver cdc_driver = {
.disconnect = usbnet_disconnect,
.suspend = usbnet_suspend,
.resume = usbnet_resume,
+ .supports_autosuspend = 1,
};
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index ca5ca5a..c9938d5 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -353,7 +353,8 @@ static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
if (netif_running (dev->net)
&& netif_device_present (dev->net)
- && !test_bit (EVENT_RX_HALT, &dev->flags)) {
+ && !test_bit (EVENT_RX_HALT, &dev->flags)
+ && !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
case -EPIPE:
usbnet_defer_kevent (dev, EVENT_RX_HALT);
@@ -611,15 +612,36 @@ EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
/*-------------------------------------------------------------------------*/
// precondition: never called in_interrupt
+static void usbnet_terminate_urbs(struct usbnet *dev)
+{
+ DECLARE_WAIT_QUEUE_HEAD_ONSTACK (unlink_wakeup);
+ DECLARE_WAITQUEUE (wait, current);
+ int temp;
+
+ /* ensure there are no more active urbs */
+ add_wait_queue(&unlink_wakeup, &wait);
+ dev->wait = &unlink_wakeup;
+ temp = unlink_urbs(dev, &dev->txq) +
+ unlink_urbs(dev, &dev->rxq);
+
+ /* maybe wait for deletions to finish. */
+ while (!skb_queue_empty(&dev->rxq)
+ && !skb_queue_empty(&dev->txq)
+ && !skb_queue_empty(&dev->done)) {
+ schedule_timeout(UNLINK_TIMEOUT_MS);
+ if (netif_msg_ifdown(dev))
+ devdbg(dev, "waited for %d urb completions",
+ temp);
+ }
+ dev->wait = NULL;
+ remove_wait_queue(&unlink_wakeup, &wait);
+}
int usbnet_stop (struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
struct driver_info *info = dev->driver_info;
- int temp;
int retval;
- DECLARE_WAIT_QUEUE_HEAD_ONSTACK (unlink_wakeup);
- DECLARE_WAITQUEUE (wait, current);
netif_stop_queue (net);
@@ -641,25 +663,8 @@ int usbnet_stop (struct net_device *net)
info->description);
}
- if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) {
- /* ensure there are no more active urbs */
- add_wait_queue(&unlink_wakeup, &wait);
- dev->wait = &unlink_wakeup;
- temp = unlink_urbs(dev, &dev->txq) +
- unlink_urbs(dev, &dev->rxq);
-
- /* maybe wait for deletions to finish. */
- while (!skb_queue_empty(&dev->rxq)
- && !skb_queue_empty(&dev->txq)
- && !skb_queue_empty(&dev->done)) {
- msleep(UNLINK_TIMEOUT_MS);
- if (netif_msg_ifdown(dev))
- devdbg(dev, "waited for %d urb completions",
- temp);
- }
- dev->wait = NULL;
- remove_wait_queue(&unlink_wakeup, &wait);
- }
+ if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
+ usbnet_terminate_urbs(dev);
usb_kill_urb(dev->interrupt);
@@ -672,7 +677,10 @@ int usbnet_stop (struct net_device *net)
dev->flags = 0;
del_timer_sync (&dev->delay);
tasklet_kill (&dev->bh);
- usb_autopm_put_interface(dev->intf);
+ if (info->manage_power)
+ info->manage_power(dev, 0);
+ else
+ usb_autopm_put_interface(dev->intf);
return 0;
}
@@ -753,6 +761,12 @@ int usbnet_open (struct net_device *net)
// delay posting reads until we're fully open
tasklet_schedule (&dev->bh);
+ if (info->manage_power) {
+ retval = info->manage_power(dev, 1);
+ if (retval < 0)
+ goto done;
+ usb_autopm_put_interface(dev->intf);
+ }
return retval;
done:
usb_autopm_put_interface(dev->intf);
@@ -882,6 +896,7 @@ kevent (struct work_struct *work)
if (test_bit (EVENT_TX_HALT, &dev->flags)) {
unlink_urbs (dev, &dev->txq);
status = usb_clear_halt (dev->udev, dev->out);
+ usb_autopm_put_interface(dev->intf);
if (status < 0
&& status != -EPIPE
&& status != -ESHUTDOWN) {
@@ -953,17 +968,20 @@ static void tx_complete (struct urb *urb)
if (urb->status == 0) {
dev->net->stats.tx_packets++;
dev->net->stats.tx_bytes += entry->length;
+ usb_autopm_put_interface_async(dev->intf);
} else {
dev->net->stats.tx_errors++;
switch (urb->status) {
case -EPIPE:
+ /* we do not allow autosuspension */
usbnet_defer_kevent (dev, EVENT_TX_HALT);
break;
/* software-driven interface shutdown */
case -ECONNRESET: // async unlink
case -ESHUTDOWN: // hardware gone
+ usb_autopm_put_interface_async(dev->intf);
break;
// like rx, tx gets controller i/o faults during khubd delays
@@ -971,6 +989,7 @@ static void tx_complete (struct urb *urb)
case -EPROTO:
case -ETIME:
case -EILSEQ:
+ usb_mark_last_busy(dev->udev);
if (!timer_pending (&dev->delay)) {
mod_timer (&dev->delay,
jiffies + THROTTLE_JIFFIES);
@@ -979,8 +998,10 @@ static void tx_complete (struct urb *urb)
urb->status);
}
netif_stop_queue (dev->net);
+ usb_autopm_put_interface_async(dev->intf);
break;
default:
+ usb_autopm_put_interface_async(dev->intf);
if (netif_msg_tx_err (dev))
devdbg (dev, "tx err %d", entry->urb->status);
break;
@@ -1058,6 +1079,23 @@ netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
}
spin_lock_irqsave (&dev->txq.lock, flags);
+ retval = usb_autopm_get_interface_async(dev->intf);
+ if (retval < 0) {
+ spin_unlock_irqrestore (&dev->txq.lock, flags);
+ goto drop;
+ }
+
+#ifdef CONFIG_PM
+ /* if this triggers the device is still a sleep */
+ if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
+ /* transmission will be done in resume */
+ dev->deferred = urb;
+ /* no use to process more packets */
+ netif_stop_queue(net);
+ spin_unlock_irqrestore(&dev->txq.lock, flags);
+ goto deferred;
+ }
+#endif
switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
case -EPIPE:
@@ -1088,6 +1126,7 @@ drop:
devdbg (dev, "> tx, len %d, type 0x%x",
length, skb->protocol);
}
+deferred:
return NETDEV_TX_OK;
}
EXPORT_SYMBOL_GPL(usbnet_start_xmit);
@@ -1363,13 +1402,23 @@ int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
struct usbnet *dev = usb_get_intfdata(intf);
if (!dev->suspend_count++) {
+ spin_lock_irq(&dev->txq.lock);
+ /* don't autosuspend while transmitting */
+ if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) {
+ spin_unlock_irq(&dev->txq.lock);
+ return -EBUSY;
+ } else {
+ set_bit(EVENT_DEV_ASLEEP, &dev->flags);
+ spin_unlock_irq(&dev->txq.lock);
+ }
/*
* accelerate emptying of the rx and queues, to avoid
* having everything error out.
*/
netif_device_detach (dev->net);
- (void) unlink_urbs (dev, &dev->rxq);
- (void) unlink_urbs (dev, &dev->txq);
+ usbnet_terminate_urbs(dev);
+ usb_kill_urb(dev->interrupt);
+
/*
* reattach so runtime management can use and
* wake the device
@@ -1383,10 +1432,32 @@ EXPORT_SYMBOL_GPL(usbnet_suspend);
int usbnet_resume (struct usb_interface *intf)
{
struct usbnet *dev = usb_get_intfdata(intf);
-
- if (!--dev->suspend_count)
+ struct sk_buff *skb;
+ struct urb *res;
+ int retval;
+
+ if (!--dev->suspend_count) {
+ spin_lock_irq(&dev->txq.lock);
+ res = dev->deferred;
+ dev->deferred = NULL;
+ clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
+ spin_unlock_irq(&dev->txq.lock);
+ if (res) {
+ retval = usb_submit_urb(res, GFP_NOIO);
+ if (retval < 0) {
+ usb_free_urb(res);
+ netif_start_queue(dev->net);
+ usb_autopm_put_interface_async(dev->intf);
+ } else {
+ skb = (struct sk_buff *)res->context;
+ dev->net->trans_start = jiffies;
+ __skb_queue_tail (&dev->txq, skb);
+ if (!(dev->txq.qlen >= TX_QLEN(dev)))
+ netif_start_queue(dev->net);
+ }
+ }
tasklet_schedule (&dev->bh);
-
+ }
return 0;
}
EXPORT_SYMBOL_GPL(usbnet_resume);
diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h
index f814730..e418c0b 100644
--- a/include/linux/usb/usbnet.h
+++ b/include/linux/usb/usbnet.h
@@ -55,6 +55,7 @@ struct usbnet {
struct sk_buff_head done;
struct sk_buff_head rxq_pause;
struct urb *interrupt;
+ struct urb *deferred;
struct tasklet_struct bh;
struct work_struct kevent;
@@ -65,6 +66,8 @@ struct usbnet {
# define EVENT_STS_SPLIT 3
# define EVENT_LINK_RESET 4
# define EVENT_RX_PAUSED 5
+# define EVENT_DEV_WAKING 6
+# define EVENT_DEV_ASLEEP 7
};
static inline struct usb_driver *driver_of(struct usb_interface *intf)
@@ -107,6 +110,9 @@ struct driver_info {
/* see if peer is connected ... can sleep */
int (*check_connect)(struct usbnet *);
+ /* (dis)activate runtime power management */
+ int (*manage_power)(struct usbnet *, int);
+
/* for status polling */
void (*status)(struct usbnet *, struct urb *);
--
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