Messages in this thread | | | Date | Fri, 02 Aug 2013 17:16:01 +0800 | From | Zhenzhong Duan <> | Subject | Re: [PATCH 2/3] Refactor msi/msix restore code Part2 |
| |
On 2013-08-01 23:16, Konrad Rzeszutek Wilk wrote: > On Wed, Jul 31, 2013 at 04:41:32PM -0600, Bjorn Helgaas wrote: >> On Tue, Jul 23, 2013 at 9:08 PM, Zhenzhong Duan >> <zhenzhong.duan@oracle.com> wrote: >>> xen_initdom_restore_msi_irqs trigger a hypercall to restore addr/data/mask >>> in dom0. It's better to do the same for default_restore_msi_irqs in baremetal. >>> >>> Move restore of mask in default_restore_msi_irqs, this could avoid mask >>> restored twice in dom0, once in hypercall, the other in kernel. >>> >>> Without that, qlcnic driver calling pci_reset_function will lost interrupt >>> in dom0. >>> >>> Tested-by: Sucheta Chakraborty <sucheta.chakraborty@qlogic.com> >>> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com> >>> --- >>> drivers/pci/msi.c | 17 ++++++++++++++--- >>> 1 files changed, 14 insertions(+), 3 deletions(-) >>> >>> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c >>> index 87223ae..922fb49 100644 >>> --- a/drivers/pci/msi.c >>> +++ b/drivers/pci/msi.c >>> @@ -216,6 +216,8 @@ void unmask_msi_irq(struct irq_data *data) >>> #ifdef HAVE_DEFAULT_MSI_RESTORE_IRQS >>> void default_restore_msi_irqs(struct pci_dev *dev, int irq) >>> { >>> + int pos; >>> + u16 control; >>> struct msi_desc *entry; >>> >>> entry = NULL; >>> @@ -228,8 +230,19 @@ void default_restore_msi_irqs(struct pci_dev *dev, int irq) >>> entry = irq_get_msi_desc(irq); >>> } >>> >>> - if (entry) >>> + if (entry) { >>> write_msi_msg(irq, &entry->msg); >>> + if (dev->msix_enabled) { >>> + msix_mask_irq(entry, entry->masked); >>> + readl(entry->mask_base); >>> + } else { >>> + pos = entry->msi_attrib.pos; >>> + pci_read_config_word(dev, pos + PCI_MSI_FLAGS, >>> + &control); >>> + msi_mask_irq(entry, msi_capable_mask(control), >>> + entry->masked); >>> + } >>> + } >>> } >>> #endif >>> >>> @@ -406,7 +419,6 @@ static void __pci_restore_msi_state(struct pci_dev *dev) >>> arch_restore_msi_irqs(dev, dev->irq); >>> >>> pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control); >>> - msi_mask_irq(entry, msi_capable_mask(control), entry->masked); >>> control &= ~PCI_MSI_FLAGS_QSIZE; >>> control |= (entry->msi_attrib.multiple << 4) | PCI_MSI_FLAGS_ENABLE; >>> pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control); >>> @@ -430,7 +442,6 @@ static void __pci_restore_msix_state(struct pci_dev *dev) >>> >>> list_for_each_entry(entry, &dev->msi_list, list) { >>> arch_restore_msi_irqs(dev, entry->irq); >>> - msix_mask_irq(entry, entry->masked); >>> } >>> >>> control &= ~PCI_MSIX_FLAGS_MASKALL; >> Konrad, are you OK with this patch now? > Yes, I wanted to make sure that the existing behavior under baremetal > was not altered. > > And Duan had confirmed it was not - thought to be on a safe side it > would be good to confirm this via testing just in case. I had ever let our customer test on baremetal and it passed.
zduan
| |