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powerpc/pci: Fix regression in powerpc MSI-X 

Patch f598282f51 exposed a problem in
powerpc MSI-X functionality, making network interfaces such as ixgbe
and cxgb3 stop to work when MSI-X is enabled. RX interrupts were not
being generated.

The problem was caused because MSI irq was not being effectively
unmasked after device initialization.

Signed-off-by: Andre Detsch <adetsch@br.ibm.com>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Andre Detsch 2009-11-04 13:03:19 -02:00 committed by Benjamin Herrenschmidt
parent 978d7eb31d
commit 8435b027b8
2 changed files with 9 additions and 2 deletions
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2
arch/powerpc/platforms/pseries/msi.c
View File

@ -432,8 +432,6 @@ static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
/* Read config space back so we can restore after reset */ /* Read config space back so we can restore after reset */
read_msi_msg(virq, &msg); read_msi_msg(virq, &msg);
entry->msg = msg; entry->msg = msg;
unmask_msi_irq(virq);
} }
return 0; return 0;

9
arch/powerpc/platforms/pseries/xics.c
View File

@ -18,6 +18,7 @@
#include <linux/init.h> #include <linux/init.h>
#include <linux/radix-tree.h> #include <linux/radix-tree.h>
#include <linux/cpu.h> #include <linux/cpu.h>
#include <linux/msi.h>
#include <linux/of.h> #include <linux/of.h>
#include <asm/firmware.h> #include <asm/firmware.h>
@ -219,6 +220,14 @@ static void xics_unmask_irq(unsigned int virq)
static unsigned int xics_startup(unsigned int virq) static unsigned int xics_startup(unsigned int virq)
{ {
/*
* The generic MSI code returns with the interrupt disabled on the
* card, using the MSI mask bits. Firmware doesn't appear to unmask
* at that level, so we do it here by hand.
*/
if (irq_to_desc(virq)->msi_desc)
unmask_msi_irq(virq);
/* unmask it */ /* unmask it */
xics_unmask_irq(virq); xics_unmask_irq(virq);
return 0; return 0;