diff options
| author | Keith Busch <keith.busch@intel.com> | 2016-06-20 09:39:53 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-06-20 14:41:16 -0500 |
| commit | 9c2053040ca7ae52f1143a47ae84502aa7970438 (patch) | |
| tree | a875234d3475cf90d28ef09ad8cdb01090803309 | |
| parent | e382dffc904d14cb6e2c31e2eefebdca41343943 (diff) | |
| download | linux-9c2053040ca7ae52f1143a47ae84502aa7970438.tar.bz2 | |
x86/PCI: VMD: Separate MSI and MSI-X vector sharing
Child devices in a VMD domain that want to use MSI are slowing down MSI-X
using devices sharing the same vectors. Move all MSI usage to a single VMD
vector, and MSI-X devices can share the rest.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Jon Derrick <jonathan.derrick@intel.com>
| -rw-r--r-- | arch/x86/pci/vmd.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/arch/x86/pci/vmd.c b/arch/x86/pci/vmd.c index 0f77cc1dbb4e..fd582abfad91 100644 --- a/arch/x86/pci/vmd.c +++ b/arch/x86/pci/vmd.c @@ -169,11 +169,14 @@ static irq_hw_number_t vmd_get_hwirq(struct msi_domain_info *info, * XXX: We can be even smarter selecting the best IRQ once we solve the * affinity problem. */ -static struct vmd_irq_list *vmd_next_irq(struct vmd_dev *vmd) +static struct vmd_irq_list *vmd_next_irq(struct vmd_dev *vmd, struct msi_desc *desc) { - int i, best = 0; + int i, best = 1; unsigned long flags; + if (!desc->msi_attrib.is_msix || vmd->msix_count == 1) + 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) @@ -188,14 +191,15 @@ static int vmd_msi_init(struct irq_domain *domain, struct msi_domain_info *info, unsigned int virq, irq_hw_number_t hwirq, msi_alloc_info_t *arg) { - struct vmd_dev *vmd = vmd_from_bus(msi_desc_to_pci_dev(arg->desc)->bus); + struct msi_desc *desc = arg->desc; + struct vmd_dev *vmd = vmd_from_bus(msi_desc_to_pci_dev(desc)->bus); struct vmd_irq *vmdirq = kzalloc(sizeof(*vmdirq), GFP_KERNEL); if (!vmdirq) return -ENOMEM; INIT_LIST_HEAD(&vmdirq->node); - vmdirq->irq = vmd_next_irq(vmd); + vmdirq->irq = vmd_next_irq(vmd, desc); vmdirq->virq = virq; irq_domain_set_info(domain, virq, vmdirq->irq->vmd_vector, info->chip, |