On Mon, Aug 5, 2013 at 1:21 AM, Zhenzhong Duan
<zhenzhong.duan@xxxxxxxxxx> wrote:
> xen_initdom_restore_msi_irqs trigger a hypercall to restore addr/data/mask
> in dom0. It's better to do the same in default_restore_msi_irqs for baremetal.
>
> Move restore of mask in default_restore_msi_irqs, this could avoid mask
> restored twice in dom0, and the logic for baremetal keep same.
>
> First mask restore is in xen_initdom_restore_msi_irqs->PHYSDEVOP_restore_msi,
> Second restore is __pci_restore_msix_state->msix_mask_irq.
>
> Mask bits are under full control of xen, and the entry->masked in dom0 kernel
> is invalid. restore an invalid value to mask register could mask the msix
> interrupt.
>
> Without fix, qlcnic driver calling pci_reset_function will lost interrupt
> in dom0.
Konrad, this changelog still doesn't make any sense to me, but if you
ack this, I guess I can apply it.
I guess there are also:
Jul 24 [PATCH 1/3] Refactor msi/msix restore code Part1
Jul 30 [PATCH 3/3 v2] Update x86_msi.restore_msi_irqs API param
and all three should be applied as a series?
> Tested-by: Sucheta Chakraborty <sucheta.chakraborty@xxxxxxxxxx>
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@xxxxxxxxxx>
> ---
> 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;
> --
> 1.7.3
>
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