diff options
| author | Bjorn Helgaas <bhelgaas@google.com> | 2018-08-15 22:59:16 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2018-08-15 22:59:16 +0300 |
| commit | fa687fb9ced47b97bd22297366e788dac1927dd7 (patch) | |
| tree | 67a41bd3501ad652660e8c67315149739f9f1952 | |
| parent | 323fc7509a2a752207924dee9866a1b4f2838db4 (diff) | |
| parent | a7f58b9ecfd3c0f63703ec10f4a592cc38dbd1b8 (diff) | |
| download | linux-fa687fb9ced47b97bd22297366e788dac1927dd7.tar.xz | |
Merge branch 'remotes/lorenzo/pci/vmd'
- 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
| -rw-r--r-- | drivers/pci/controller/vmd.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c index 942b64fc7f1f..fd2dbd7eed7b 100644 --- a/drivers/pci/controller/vmd.c +++ b/drivers/pci/controller/vmd.c @@ -197,9 +197,20 @@ static struct vmd_irq_list *vmd_next_irq(struct vmd_dev *vmd, struct msi_desc *d int i, best = 1; 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]; + /* + * 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); for (i = 1; i < vmd->msix_count; i++) if (vmd->irqs[i].count < vmd->irqs[best].count) |