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[TG3]: Add msi test

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Add MSI test for chips that support MSI. If MSI test fails, it will
switch back to INTx mode and will print a message asking the user to
report the failure.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2005-04-21 17:13:59 -07:00 committed by David S. Miller
parent 88b06bc26b
commit 7938109fff
1 changed files with 151 additions and 3 deletions
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154
drivers/net/tg3.c
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@ -2996,6 +2996,22 @@ static irqreturn_t tg3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
return IRQ_RETVAL(handled);
}
/* ISR for interrupt test */
static irqreturn_t tg3_test_isr(int irq, void *dev_id,
struct pt_regs *regs)
{
struct net_device *dev = dev_id;
struct tg3 *tp = netdev_priv(dev);
struct tg3_hw_status *sblk = tp->hw_status;
if (sblk->status & SD_STATUS_UPDATED) {
tw32_mailbox(MAILBOX_INTERRUPT_0 + TG3_64BIT_REG_LOW,
0x00000001);
return IRQ_RETVAL(1);
}
return IRQ_RETVAL(0);
}
static int tg3_init_hw(struct tg3 *);
static int tg3_halt(struct tg3 *);
@ -5796,6 +5812,118 @@ static void tg3_timer(unsigned long __opaque)
add_timer(&tp->timer);
}
static int tg3_test_interrupt(struct tg3 *tp)
{
struct net_device *dev = tp->dev;
int err, i;
u32 int_mbox = 0;
tg3_disable_ints(tp);
free_irq(tp->pdev->irq, dev);
err = request_irq(tp->pdev->irq, tg3_test_isr,
SA_SHIRQ, dev->name, dev);
if (err)
return err;
tg3_enable_ints(tp);
tw32_f(HOSTCC_MODE, tp->coalesce_mode | HOSTCC_MODE_ENABLE |
HOSTCC_MODE_NOW);
for (i = 0; i < 5; i++) {
int_mbox = tr32(MAILBOX_INTERRUPT_0 + TG3_64BIT_REG_LOW);
if (int_mbox != 0)
break;
msleep(10);
}
tg3_disable_ints(tp);
free_irq(tp->pdev->irq, dev);
if (tp->tg3_flags2 & TG3_FLG2_USING_MSI)
err = request_irq(tp->pdev->irq, tg3_msi,
0, dev->name, dev);
else
err = request_irq(tp->pdev->irq, tg3_interrupt,
SA_SHIRQ, dev->name, dev);
if (err)
return err;
if (int_mbox != 0)
return 0;
return -EIO;
}
/* Returns 0 if MSI test succeeds or MSI test fails and INTx mode is
* successfully restored
*/
static int tg3_test_msi(struct tg3 *tp)
{
struct net_device *dev = tp->dev;
int err;
u16 pci_cmd;
if (!(tp->tg3_flags2 & TG3_FLG2_USING_MSI))
return 0;
/* Turn off SERR reporting in case MSI terminates with Master
* Abort.
*/
pci_read_config_word(tp->pdev, PCI_COMMAND, &pci_cmd);
pci_write_config_word(tp->pdev, PCI_COMMAND,
pci_cmd & ~PCI_COMMAND_SERR);
err = tg3_test_interrupt(tp);
pci_write_config_word(tp->pdev, PCI_COMMAND, pci_cmd);
if (!err)
return 0;
/* other failures */
if (err != -EIO)
return err;
/* MSI test failed, go back to INTx mode */
printk(KERN_WARNING PFX "%s: No interrupt was generated using MSI, "
"switching to INTx mode. Please report this failure to "
"the PCI maintainer and include system chipset information.\n",
tp->dev->name);
free_irq(tp->pdev->irq, dev);
pci_disable_msi(tp->pdev);
tp->tg3_flags2 &= ~TG3_FLG2_USING_MSI;
err = request_irq(tp->pdev->irq, tg3_interrupt,
SA_SHIRQ, dev->name, dev);
if (err)
return err;
/* Need to reset the chip because the MSI cycle may have terminated
* with Master Abort.
*/
spin_lock_irq(&tp->lock);
spin_lock(&tp->tx_lock);
tg3_halt(tp);
err = tg3_init_hw(tp);
spin_unlock(&tp->tx_lock);
spin_unlock_irq(&tp->lock);
if (err)
free_irq(tp->pdev->irq, dev);
return err;
}
static int tg3_open(struct net_device *dev)
{
struct tg3 *tp = netdev_priv(dev);
@ -5860,9 +5988,6 @@ static int tg3_open(struct net_device *dev)
tp->timer.expires = jiffies + tp->timer_offset;
tp->timer.data = (unsigned long) tp;
tp->timer.function = tg3_timer;
add_timer(&tp->timer);
tp->tg3_flags |= TG3_FLAG_INIT_COMPLETE;
}
spin_unlock(&tp->tx_lock);
@ -5878,9 +6003,32 @@ static int tg3_open(struct net_device *dev)
return err;
}
if (tp->tg3_flags2 & TG3_FLG2_USING_MSI) {
err = tg3_test_msi(tp);
if (err) {
spin_lock_irq(&tp->lock);
spin_lock(&tp->tx_lock);
if (tp->tg3_flags2 & TG3_FLG2_USING_MSI) {
pci_disable_msi(tp->pdev);
tp->tg3_flags2 &= ~TG3_FLG2_USING_MSI;
}
tg3_halt(tp);
tg3_free_rings(tp);
tg3_free_consistent(tp);
spin_unlock(&tp->tx_lock);
spin_unlock_irq(&tp->lock);
return err;
}
}
spin_lock_irq(&tp->lock);
spin_lock(&tp->tx_lock);
add_timer(&tp->timer);
tp->tg3_flags |= TG3_FLAG_INIT_COMPLETE;
tg3_enable_ints(tp);
spin_unlock(&tp->tx_lock);