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Date: Thu, 26 Apr 2007 23:49:07 +0200
From: Francois Romieu <romieu@...zoreil.com>
To: jeff@...zik.org
Cc: netdev@...r.kernel.org, Bernhard Walle <bernhard.walle@....de>,
Edward Hsu <edward_hsu@...ltek.com>
Subject: [PATCH 09/12] r8169: MSI support
It is currently limited to 0x8136 and 0x8168. 8169sb/8110sb ought to
handle it as well where they support MSI.
Includes unregister_netdev() fix from Bernhard Walle <bwalle@...e.de>
against BUG_ON(irq_has_action(dev->first_msi_irq)) (2007/02/24).
Signed-off-by: Francois Romieu <romieu@...zoreil.com>
Fixed-by: Bernhard Walle <bernhard.walle@....de>
Cc: Edward Hsu <edward_hsu@...ltek.com>
---
drivers/net/r8169.c | 102 ++++++++++++++++++++++++++++++++++++++++++++++++--
1 files changed, 97 insertions(+), 5 deletions(-)
diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index 7a0c5e7..e6dbfc9 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -250,6 +250,9 @@ enum rtl_register_content {
CmdTxEnb = 0x04,
RxBufEmpty = 0x01,
+ /* TXPoll register p.5 */
+ FSWInt = 1, /* Forced software interrupt */
+
/* Cfg9346Bits */
Cfg9346_Lock = 0x00,
Cfg9346_Unlock = 0xc0,
@@ -271,6 +274,7 @@ enum rtl_register_content {
TxDMAShift = 8, /* DMA burst value (0-7) is shift this many bits */
/* Config1 register p.24 */
+ MSIEnable = (1 << 5), /* Enable Message Signaled Interrupt */
PMEnable = (1 << 0), /* Power Management Enable */
/* Config2 register p. 25 */
@@ -414,6 +418,7 @@ struct rtl8169_private {
unsigned int (*link_ok)(void __iomem *);
struct delayed_work task;
unsigned wol_enabled : 1;
+ unsigned msi : 1;
};
MODULE_AUTHOR("Realtek and the Linux r8169 crew <netdev@...r.kernel.org>");
@@ -1410,12 +1415,85 @@ static int rtl8169_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
return -EOPNOTSUPP;
}
+static irqreturn_t __devinit rtl_test_intr(int irq, void *dev_instance)
+{
+ struct rtl8169_private *tp = dev_instance;
+ void __iomem *ioaddr = tp->mmio_addr;
+ u32 status;
+
+ status = RTL_R16(IntrStatus);
+ if ((status == 0xffff) || !status)
+ return IRQ_NONE;
+
+ if (status & SWInt) {
+ tp->msi = 1;
+ smp_wmb();
+ RTL_W16(IntrStatus, SWInt);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int __devinit rtl_try_msi(struct rtl8169_private *tp)
+{
+ struct pci_dev *pdev = tp->pci_dev;
+ void __iomem *ioaddr = tp->mmio_addr;
+ unsigned int i;
+ int rc;
+
+ rc = pci_enable_msi(pdev);
+ if (rc < 0)
+ return 0;
+
+ RTL_W8(Config2, RTL_R8(Config2) | MSIEnable);
+
+ rc = request_irq(pdev->irq, rtl_test_intr, 0, pci_name(pdev), tp);
+ if (rc < 0)
+ goto err_disable_msi_0;
+
+ RTL_W16(IntrMask, SWInt);
+ RTL_W8(TxPoll, FSWInt);
+ /* Commit */
+ RTL_R8(IntrMask);
+
+ for (i = 0; i < 100; i++) {
+ smp_rmb();
+ if (tp->msi)
+ break;
+ msleep(10);
+ }
+
+ RTL_W16(IntrStatus, SWInt);
+ RTL_W16(IntrMask, 0);
+ RTL_R8(IntrMask);
+
+ free_irq(pdev->irq, tp);
+
+ smp_rmb();
+
+ if (!tp->msi && netif_msg_drv(tp))
+ goto err_status_ok_1;
+
+ tp->dev->irq = pdev->irq;
+out:
+ return rc;
+
+err_status_ok_1:
+ printk(KERN_INFO "%s: no MSI. Back to INTx.\n", pci_name(pdev));
+ rc = 0;
+err_disable_msi_0:
+ RTL_W8(Config2, RTL_R8(Config2) & ~MSIEnable);
+ pci_disable_msi(pdev);
+ goto out;
+}
+
static const struct rtl_cfg_info {
void (*hw_start)(struct net_device *);
unsigned int region;
unsigned int align;
u16 intr_event;
u16 napi_event;
+ unsigned msi : 1;
} rtl_cfg_infos [] = {
[RTL_CFG_0] = {
.hw_start = rtl_hw_start_8169,
@@ -1423,7 +1501,8 @@ static const struct rtl_cfg_info {
.align = 2,
.intr_event = SYSErr | LinkChg | RxOverflow |
RxFIFOOver | TxErr | TxOK | RxOK | RxErr,
- .napi_event = RxFIFOOver | TxErr | TxOK | RxOK | RxOverflow
+ .napi_event = RxFIFOOver | TxErr | TxOK | RxOK | RxOverflow,
+ .msi = 0
},
[RTL_CFG_1] = {
.hw_start = rtl_hw_start_8168,
@@ -1431,7 +1510,8 @@ static const struct rtl_cfg_info {
.align = 8,
.intr_event = SYSErr | LinkChg | RxOverflow |
TxErr | TxOK | RxOK | RxErr,
- .napi_event = TxErr | TxOK | RxOK | RxOverflow
+ .napi_event = TxErr | TxOK | RxOK | RxOverflow,
+ .msi = 1
},
[RTL_CFG_2] = {
.hw_start = rtl_hw_start_8101,
@@ -1439,7 +1519,8 @@ static const struct rtl_cfg_info {
.align = 8,
.intr_event = SYSErr | LinkChg | RxOverflow | PCSTimeout |
RxFIFOOver | TxErr | TxOK | RxOK | RxErr,
- .napi_event = RxFIFOOver | TxErr | TxOK | RxOK | RxOverflow
+ .napi_event = RxFIFOOver | TxErr | TxOK | RxOK | RxOverflow,
+ .msi = 1
}
};
@@ -1663,6 +1744,12 @@ rtl8169_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
if (rc < 0)
goto err_out_unmap_5;
+ if (cfg->msi) {
+ rc = rtl_try_msi(tp);
+ if (rc < 0)
+ goto err_out_unregister_netdev_6;
+ }
+
pci_set_drvdata(pdev, dev);
if (netif_msg_probe(tp)) {
@@ -1682,6 +1769,8 @@ rtl8169_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
out:
return rc;
+err_out_unregister_netdev_6:
+ unregister_netdev(dev);
err_out_unmap_5:
iounmap(ioaddr);
err_out_free_res_4:
@@ -1703,6 +1792,9 @@ static void __devexit rtl8169_remove_one(struct pci_dev *pdev)
flush_scheduled_work();
unregister_netdev(dev);
+ if (tp->msi)
+ pci_disable_msi(pdev);
+ tp->msi = 0;
rtl8169_release_board(pdev, dev, tp->mmio_addr);
pci_set_drvdata(pdev, NULL);
}
@@ -1746,8 +1838,8 @@ static int rtl8169_open(struct net_device *dev)
smp_mb();
- retval = request_irq(dev->irq, rtl8169_interrupt, IRQF_SHARED,
- dev->name, dev);
+ retval = request_irq(dev->irq, rtl8169_interrupt,
+ tp->msi ? 0 : IRQF_SHARED, dev->name, dev);
if (retval < 0)
goto err_release_ring_2;
--
1.4.4.2
-
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