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Subject[RFC][PATCH 12/12] PM / r8169: Add simplified run-time PM support
Date
From: Rafael J. Wysocki <rjw@sisk.pl>

Use the PCI run-time power management framework to add simplified
run-time PM support to the r8169 driver. Namely, make the driver
suspend the device when the link is off and set it up for generating
wake-up event after the link has been detected again.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
drivers/net/r8169.c | 133 +++++++++++++++++++++++++++++++++++++++++-----------
1 file changed, 106 insertions(+), 27 deletions(-)
Index: linux-2.6/drivers/net/r8169.c
===================================================================
--- linux-2.6.orig/drivers/net/r8169.c
+++ linux-2.6/drivers/net/r8169.c
@@ -23,6 +23,7 @@
#include <linux/tcp.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
+#include <linux/pm_runtime.h>

#include <asm/system.h>
#include <asm/io.h>
@@ -504,6 +505,8 @@ struct rtl8169_private {

struct mii_if_info mii;
struct rtl8169_counters counters;
+ u32 saved_wolopts;
+ bool exiting;
};

MODULE_AUTHOR("Realtek and the Linux r8169 crew <netdev@vger.kernel.org>");
@@ -750,48 +753,54 @@ static void rtl8169_check_link_status(st
if (netif_msg_ifdown(tp))
printk(KERN_INFO PFX "%s: link down\n", dev->name);
netif_carrier_off(dev);
+ pm_schedule_suspend(&tp->pci_dev->dev, 100);
}
spin_unlock_irqrestore(&tp->lock, flags);
}

-static void rtl8169_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
+#define WAKE_ANY (WAKE_PHY | WAKE_MAGIC | WAKE_UCAST | WAKE_BCAST | WAKE_MCAST)
+
+static u32 __rtl8169_get_wol(struct rtl8169_private *tp)
{
- struct rtl8169_private *tp = netdev_priv(dev);
void __iomem *ioaddr = tp->mmio_addr;
u8 options;
-
- wol->wolopts = 0;
-
-#define WAKE_ANY (WAKE_PHY | WAKE_MAGIC | WAKE_UCAST | WAKE_BCAST | WAKE_MCAST)
- wol->supported = WAKE_ANY;
-
- spin_lock_irq(&tp->lock);
+ u32 wolopts = 0;

options = RTL_R8(Config1);
if (!(options & PMEnable))
- goto out_unlock;
+ return 0;

options = RTL_R8(Config3);
if (options & LinkUp)
- wol->wolopts |= WAKE_PHY;
+ wolopts |= WAKE_PHY;
if (options & MagicPacket)
- wol->wolopts |= WAKE_MAGIC;
+ wolopts |= WAKE_MAGIC;

options = RTL_R8(Config5);
if (options & UWF)
- wol->wolopts |= WAKE_UCAST;
+ wolopts |= WAKE_UCAST;
if (options & BWF)
- wol->wolopts |= WAKE_BCAST;
+ wolopts |= WAKE_BCAST;
if (options & MWF)
- wol->wolopts |= WAKE_MCAST;
+ wolopts |= WAKE_MCAST;

-out_unlock:
- spin_unlock_irq(&tp->lock);
+ return wolopts;
}

-static int rtl8169_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
+static void rtl8169_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
{
struct rtl8169_private *tp = netdev_priv(dev);
+
+ spin_lock_irq(&tp->lock);
+
+ wol->supported = WAKE_ANY;
+ wol->wolopts = __rtl8169_get_wol(tp);
+
+ spin_unlock_irq(&tp->lock);
+}
+
+static void __rtl8169_set_wol(struct rtl8169_private *tp, u32 wolopts)
+{
void __iomem *ioaddr = tp->mmio_addr;
unsigned int i;
static struct {
@@ -808,23 +817,29 @@ static int rtl8169_set_wol(struct net_de
{ WAKE_ANY, Config5, LanWake }
};

- spin_lock_irq(&tp->lock);
-
RTL_W8(Cfg9346, Cfg9346_Unlock);

for (i = 0; i < ARRAY_SIZE(cfg); i++) {
u8 options = RTL_R8(cfg[i].reg) & ~cfg[i].mask;
- if (wol->wolopts & cfg[i].opt)
+ if (wolopts & cfg[i].opt)
options |= cfg[i].mask;
RTL_W8(cfg[i].reg, options);
}

RTL_W8(Cfg9346, Cfg9346_Lock);
+}
+
+static int rtl8169_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
+{
+ struct rtl8169_private *tp = netdev_priv(dev);
+
+ spin_lock_irq(&tp->lock);

if (wol->wolopts)
tp->features |= RTL_FEATURE_WOL;
else
tp->features &= ~RTL_FEATURE_WOL;
+ __rtl8169_set_wol(tp, wol->wolopts);
device_set_wakeup_enable(&tp->pci_dev->dev, wol->wolopts);

spin_unlock_irq(&tp->lock);
@@ -3000,6 +3015,7 @@ rtl8169_init_one(struct pci_dev *pdev, c
tp->dev = dev;
tp->pci_dev = pdev;
tp->msg_enable = netif_msg_init(debug.msg_enable, R8169_MSG_DEFAULT);
+ tp->exiting = false;

mii = &tp->mii;
mii->dev = dev;
@@ -3232,6 +3248,8 @@ static void __devexit rtl8169_remove_one
struct net_device *dev = pci_get_drvdata(pdev);
struct rtl8169_private *tp = netdev_priv(dev);

+ tp->exiting = true;
+
flush_scheduled_work();

unregister_netdev(dev);
@@ -3254,7 +3272,6 @@ static int rtl8169_open(struct net_devic
struct pci_dev *pdev = tp->pci_dev;
int retval = -ENOMEM;

-
rtl8169_set_rxbufsize(tp, dev);

/*
@@ -3291,6 +3308,13 @@ static int rtl8169_open(struct net_devic

rtl8169_request_timer(dev);

+ tp->saved_wolopts = 0;
+
+ if (pci_dev_run_wake(pdev)) {
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+ }
+
rtl8169_check_link_status(dev, tp, tp->mmio_addr);
out:
return retval;
@@ -4724,6 +4748,14 @@ static int rtl8169_close(struct net_devi
struct rtl8169_private *tp = netdev_priv(dev);
struct pci_dev *pdev = tp->pci_dev;

+ if (pci_dev_run_wake(pdev)) {
+ pm_runtime_get_noresume(&pdev->dev);
+ pm_runtime_resume(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ pm_runtime_set_suspended(&pdev->dev);
+ pm_runtime_put_noidle(&pdev->dev);
+ }
+
/* update counters before going down */
rtl8169_update_counters(dev);

@@ -4841,21 +4873,65 @@ static int rtl8169_suspend(struct device
return 0;
}

+static void __rtl8169_resume(struct net_device *dev)
+{
+ netif_device_attach(dev);
+ rtl8169_schedule_work(dev, rtl8169_reset_task);
+}
+
static int rtl8169_resume(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct net_device *dev = pci_get_drvdata(pdev);

- if (!netif_running(dev))
- goto out;
+ if (netif_running(dev))
+ __rtl8169_resume(dev);

- netif_device_attach(dev);
+ return 0;
+}
+
+static int rtl8169_runtime_suspend(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct net_device *dev = pci_get_drvdata(pdev);
+ struct rtl8169_private *tp = netdev_priv(dev);
+
+ dev_dbg(&pdev->dev, "suspending\n");
+
+ spin_lock_irq(&tp->lock);
+ tp->saved_wolopts = __rtl8169_get_wol(tp);
+ __rtl8169_set_wol(tp, WAKE_ANY);
+ spin_unlock_irq(&tp->lock);
+
+ rtl8169_net_suspend(dev);
+
+ return 0;
+}
+
+static int rtl8169_runtime_resume(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct net_device *dev = pci_get_drvdata(pdev);
+ struct rtl8169_private *tp = netdev_priv(dev);
+
+ dev_dbg(&pdev->dev, "resuming\n");
+
+ spin_lock_irq(&tp->lock);
+ __rtl8169_set_wol(tp, tp->saved_wolopts);
+ tp->saved_wolopts = 0;
+ spin_unlock_irq(&tp->lock);
+
+ if (!tp->exiting)
+ __rtl8169_resume(dev);

- rtl8169_schedule_work(dev, rtl8169_reset_task);
-out:
return 0;
}

+static int rtl8169_runtime_idle(struct device *device)
+{
+ return -EBUSY;
+}
+
static struct dev_pm_ops rtl8169_pm_ops = {
.suspend = rtl8169_suspend,
.resume = rtl8169_resume,
@@ -4863,6 +4939,9 @@ static struct dev_pm_ops rtl8169_pm_ops
.thaw = rtl8169_resume,
.poweroff = rtl8169_suspend,
.restore = rtl8169_resume,
+ .runtime_suspend = rtl8169_runtime_suspend,
+ .runtime_resume = rtl8169_runtime_resume,
+ .runtime_idle = rtl8169_runtime_idle,
};

#define RTL8169_PM_OPS (&rtl8169_pm_ops)


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