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Merge branch 'remotes/lorenzo/pci/vmd'

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- Whitelist VMD devices with fast interrupt handlers to avoid sharing
    vectors with slow handlers (Keith Busch)

* remotes/lorenzo/pci/vmd:
  PCI: vmd: White list for fast interrupt handlers
This commit is contained in:
Bjorn Helgaas 2018-08-15 14:59:16 -05:00
commit fa687fb9ce
1 changed files with 12 additions and 1 deletions
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13
drivers/pci/controller/vmd.c
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@ -197,9 +197,20 @@ static struct vmd_irq_list *vmd_next_irq(struct vmd_dev *vmd, struct msi_desc *d
int i, best = 1; int i, best = 1;
unsigned long flags; unsigned long flags;
if (pci_is_bridge(msi_desc_to_pci_dev(desc)) || vmd->msix_count == 1) if (vmd->msix_count == 1)
return &vmd->irqs[0]; return &vmd->irqs[0];
/*
* White list for fast-interrupt handlers. All others will share the
* "slow" interrupt vector.
*/
switch (msi_desc_to_pci_dev(desc)->class) {
case PCI_CLASS_STORAGE_EXPRESS:
break;
default:
return &vmd->irqs[0];
}
raw_spin_lock_irqsave(&list_lock, flags); raw_spin_lock_irqsave(&list_lock, flags);
for (i = 1; i < vmd->msix_count; i++) for (i = 1; i < vmd->msix_count; i++)
if (vmd->irqs[i].count < vmd->irqs[best].count) if (vmd->irqs[i].count < vmd->irqs[best].count)