r8169 / PCI / PM: Add simplified runtime PM support (rev. 3)
Use the PCI runtime power management framework to add basic PCI
runtime PM support to the r8169 driver. Namely, make the driver
suspend the device when the link is not present and set it up for
generating a wakeup event after the link has been detected again.
[This feature is disabled until the user space enables it with the
help of the /sys/devices/.../power/contol device attribute.]
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index 9d3ebf3..964305c 100644
--- a/drivers/net/r8169.c
+++ b/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 +505,7 @@
struct mii_if_info mii;
struct rtl8169_counters counters;
+ u32 saved_wolopts;
};
MODULE_AUTHOR("Realtek and the Linux r8169 crew <netdev@vger.kernel.org>");
@@ -744,53 +746,61 @@
spin_lock_irqsave(&tp->lock, flags);
if (tp->link_ok(ioaddr)) {
+ /* This is to cancel a scheduled suspend if there's one. */
+ pm_request_resume(&tp->pci_dev->dev);
netif_carrier_on(dev);
netif_info(tp, ifup, dev, "link up\n");
} else {
netif_carrier_off(dev);
netif_info(tp, ifdown, dev, "link down\n");
+ pm_schedule_suspend(&tp->pci_dev->dev, 100);
}
spin_unlock_irqrestore(&tp->lock, flags);
}
+#define WAKE_ANY (WAKE_PHY | WAKE_MAGIC | WAKE_UCAST | WAKE_BCAST | WAKE_MCAST)
+
+static u32 __rtl8169_get_wol(struct rtl8169_private *tp)
+{
+ void __iomem *ioaddr = tp->mmio_addr;
+ u8 options;
+ u32 wolopts = 0;
+
+ options = RTL_R8(Config1);
+ if (!(options & PMEnable))
+ return 0;
+
+ options = RTL_R8(Config3);
+ if (options & LinkUp)
+ wolopts |= WAKE_PHY;
+ if (options & MagicPacket)
+ wolopts |= WAKE_MAGIC;
+
+ options = RTL_R8(Config5);
+ if (options & UWF)
+ wolopts |= WAKE_UCAST;
+ if (options & BWF)
+ wolopts |= WAKE_BCAST;
+ if (options & MWF)
+ wolopts |= WAKE_MCAST;
+
+ return wolopts;
+}
+
static void rtl8169_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
{
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);
- options = RTL_R8(Config1);
- if (!(options & PMEnable))
- goto out_unlock;
+ wol->supported = WAKE_ANY;
+ wol->wolopts = __rtl8169_get_wol(tp);
- options = RTL_R8(Config3);
- if (options & LinkUp)
- wol->wolopts |= WAKE_PHY;
- if (options & MagicPacket)
- wol->wolopts |= WAKE_MAGIC;
-
- options = RTL_R8(Config5);
- if (options & UWF)
- wol->wolopts |= WAKE_UCAST;
- if (options & BWF)
- wol->wolopts |= WAKE_BCAST;
- if (options & MWF)
- wol->wolopts |= WAKE_MCAST;
-
-out_unlock:
spin_unlock_irq(&tp->lock);
}
-static int rtl8169_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
+static void __rtl8169_set_wol(struct rtl8169_private *tp, u32 wolopts)
{
- struct rtl8169_private *tp = netdev_priv(dev);
void __iomem *ioaddr = tp->mmio_addr;
unsigned int i;
static const struct {
@@ -807,23 +817,29 @@
{ 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);
@@ -3189,6 +3205,12 @@
device_set_wakeup_enable(&pdev->dev, tp->features & RTL_FEATURE_WOL);
+ if (pci_dev_run_wake(pdev)) {
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+ }
+ pm_runtime_idle(&pdev->dev);
+
out:
return rc;
@@ -3211,10 +3233,18 @@
struct net_device *dev = pci_get_drvdata(pdev);
struct rtl8169_private *tp = netdev_priv(dev);
+ pm_runtime_get_sync(&pdev->dev);
+
flush_scheduled_work();
unregister_netdev(dev);
+ if (pci_dev_run_wake(pdev)) {
+ pm_runtime_disable(&pdev->dev);
+ pm_runtime_set_suspended(&pdev->dev);
+ }
+ pm_runtime_put_noidle(&pdev->dev);
+
/* restore original MAC address */
rtl_rar_set(tp, dev->perm_addr);
@@ -3237,6 +3267,7 @@
struct pci_dev *pdev = tp->pci_dev;
int retval = -ENOMEM;
+ pm_runtime_get_sync(&pdev->dev);
rtl8169_set_rxbufsize(tp, dev);
@@ -3247,7 +3278,7 @@
tp->TxDescArray = pci_alloc_consistent(pdev, R8169_TX_RING_BYTES,
&tp->TxPhyAddr);
if (!tp->TxDescArray)
- goto out;
+ goto err_pm_runtime_put;
tp->RxDescArray = pci_alloc_consistent(pdev, R8169_RX_RING_BYTES,
&tp->RxPhyAddr);
@@ -3274,6 +3305,9 @@
rtl8169_request_timer(dev);
+ tp->saved_wolopts = 0;
+ pm_runtime_put_noidle(&pdev->dev);
+
rtl8169_check_link_status(dev, tp, tp->mmio_addr);
out:
return retval;
@@ -3283,9 +3317,13 @@
err_free_rx_1:
pci_free_consistent(pdev, R8169_RX_RING_BYTES, tp->RxDescArray,
tp->RxPhyAddr);
+ tp->RxDescArray = NULL;
err_free_tx_0:
pci_free_consistent(pdev, R8169_TX_RING_BYTES, tp->TxDescArray,
tp->TxPhyAddr);
+ tp->TxDescArray = NULL;
+err_pm_runtime_put:
+ pm_runtime_put_noidle(&pdev->dev);
goto out;
}
@@ -4692,6 +4730,8 @@
struct rtl8169_private *tp = netdev_priv(dev);
struct pci_dev *pdev = tp->pci_dev;
+ pm_runtime_get_sync(&pdev->dev);
+
/* update counters before going down */
rtl8169_update_counters(dev);
@@ -4706,6 +4746,8 @@
tp->TxDescArray = NULL;
tp->RxDescArray = NULL;
+ pm_runtime_put_sync(&pdev->dev);
+
return 0;
}
@@ -4804,21 +4846,74 @@
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);
-
- rtl8169_schedule_work(dev, rtl8169_reset_task);
-out:
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);
+
+ if (!tp->TxDescArray)
+ return 0;
+
+ 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);
+
+ if (!tp->TxDescArray)
+ return 0;
+
+ spin_lock_irq(&tp->lock);
+ __rtl8169_set_wol(tp, tp->saved_wolopts);
+ tp->saved_wolopts = 0;
+ spin_unlock_irq(&tp->lock);
+
+ __rtl8169_resume(dev);
+
+ return 0;
+}
+
+static int rtl8169_runtime_idle(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);
+
+ if (!tp->TxDescArray)
+ return 0;
+
+ rtl8169_check_link_status(dev, tp, tp->mmio_addr);
+ return -EBUSY;
+}
+
static const struct dev_pm_ops rtl8169_pm_ops = {
.suspend = rtl8169_suspend,
.resume = rtl8169_resume,
@@ -4826,6 +4921,9 @@
.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)