diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/msi.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/msi.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c index 1b305e411862..8627362f613e 100644 --- a/arch/powerpc/platforms/pseries/msi.c +++ b/arch/powerpc/platforms/pseries/msi.c @@ -507,12 +507,27 @@ static void pseries_msi_unmask(struct irq_data *d) irq_chip_unmask_parent(d); } +static void pseries_msi_write_msg(struct irq_data *data, struct msi_msg *msg) +{ + struct msi_desc *entry = irq_data_get_msi_desc(data); + + /* + * Do not update the MSIx vector table. It's not strictly necessary + * because the table is initialized by the underlying hypervisor, PowerVM + * or QEMU/KVM. However, if the MSIx vector entry is cleared, any further + * activation will fail. This can happen in some drivers (eg. IPR) which + * deactivate an IRQ used for testing MSI support. + */ + entry->msg = *msg; +} + static struct irq_chip pseries_pci_msi_irq_chip = { .name = "pSeries-PCI-MSI", .irq_shutdown = pseries_msi_shutdown, .irq_mask = pseries_msi_mask, .irq_unmask = pseries_msi_unmask, .irq_eoi = irq_chip_eoi_parent, + .irq_write_msi_msg = pseries_msi_write_msg, }; static struct msi_domain_info pseries_msi_domain_info = { |