The patch titled
Subject: rapidio/tsi721: fix bug in MSI interrupt handling
has been added to the -mm tree. Its filename is
rapidio-tsi721-fix-bug-in-msi-interrupt-handling.patch
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------------------------------------------------------
From: Alexandre Bounine <[email protected]>
Subject: rapidio/tsi721: fix bug in MSI interrupt handling
Fix bug in MSI interrupt handling which causes loss of event notifications.
Typical indication of lost MSI interrupts are stalled message and doorbell
transfers between RapidIO endpoints. To avoid loss of MSI interrupts all
interrupts from the device must be disabled on entering the interrupt
handler routine and re-enabled when exiting it. Re-enabling device
interrupts will trigger new MSI message(s) if Tsi721 registered new events
since entering interrupt handler routine.
This patch is applicable to kernel versions starting from v3.2.
Signed-off-by: Alexandre Bounine <[email protected]>
Cc: Matt Porter <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
drivers/rapidio/devices/tsi721.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff -puN
drivers/rapidio/devices/tsi721.c~rapidio-tsi721-fix-bug-in-msi-interrupt-handling
drivers/rapidio/devices/tsi721.c
---
a/drivers/rapidio/devices/tsi721.c~rapidio-tsi721-fix-bug-in-msi-interrupt-handling
+++ a/drivers/rapidio/devices/tsi721.c
@@ -471,6 +471,10 @@ static irqreturn_t tsi721_irqhandler(int
u32 intval;
u32 ch_inte;
+ /* For MSI mode disable all device-level interrupts */
+ if (priv->flags & TSI721_USING_MSI)
+ iowrite32(0, priv->regs + TSI721_DEV_INTE);
+
dev_int = ioread32(priv->regs + TSI721_DEV_INT);
if (!dev_int)
return IRQ_NONE;
@@ -560,6 +564,14 @@ static irqreturn_t tsi721_irqhandler(int
}
}
#endif
+
+ /* For MSI mode re-enable device-level interrupts */
+ if (priv->flags & TSI721_USING_MSI) {
+ dev_int = TSI721_DEV_INT_SR2PC_CH | TSI721_DEV_INT_SRIO |
+ TSI721_DEV_INT_SMSG_CH | TSI721_DEV_INT_BDMA_CH;
+ iowrite32(dev_int, priv->regs + TSI721_DEV_INTE);
+ }
+
return IRQ_HANDLED;
}
_
Patches currently in -mm which might be from [email protected] are
rapidio-make-enumeration-discovery-configurable.patch
rapidio-add-enumeration-discovery-start-from-user-space.patch
rapidio-documentation-update-for-enumeration-changes.patch
rapidio-tsi721-fix-bug-in-msi-interrupt-handling.patch
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