diff options
| author | Andre Detsch <adetsch@br.ibm.com> | 2009-11-04 13:03:19 -0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-11-05 17:06:27 +1100 |
| commit | 8435b027b87a78145992c37b0b8ed0f1b7761bf0 (patch) | |
| tree | f0972989a6b199079503294b20c25f81713c062c | |
| parent | 978d7eb31d44de34a7f71e04ed4158f3f854688d (diff) | |
| download | linux-8435b027b87a78145992c37b0b8ed0f1b7761bf0.tar.bz2 | |
powerpc/pci: Fix regression in powerpc MSI-X
Patch f598282f5145036312d90875d0ed5c14b49fd8a7 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>
| -rw-r--r-- | arch/powerpc/platforms/pseries/msi.c | 2 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/xics.c | 9 |
2 files changed, 9 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c index bf2e1ac41308..1164c3430f2c 100644 --- a/arch/powerpc/platforms/pseries/msi.c +++ b/arch/powerpc/platforms/pseries/msi.c @@ -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_msi_msg(virq, &msg); entry->msg = msg; - - unmask_msi_irq(virq); } return 0; diff --git a/arch/powerpc/platforms/pseries/xics.c b/arch/powerpc/platforms/pseries/xics.c index 419f8a637ffe..b9bf0eedccf2 100644 --- a/arch/powerpc/platforms/pseries/xics.c +++ b/arch/powerpc/platforms/pseries/xics.c @@ -18,6 +18,7 @@ #include <linux/init.h> #include <linux/radix-tree.h> #include <linux/cpu.h> +#include <linux/msi.h> #include <linux/of.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) { + /* + * 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 */ xics_unmask_irq(virq); return 0; |