Commit a7f58b9e authored May 08, 2018 by Keith Busch Committed by Lorenzo Pieralisi Jun 28, 2018

PCI: vmd: White list for fast interrupt handlers



Devices with slow interrupt handlers are significantly harming
performance when their interrupt vector is shared with a fast device.

Create a class code white list for devices with known fast interrupt
handlers and let all other devices share a single vector so that they
don't interfere with performance.

At the moment, only the NVM Express class code is on the list, but more
may be added if VMD users desire to use other low-latency devices in
these domains.

Signed-off-by: Keith Busch <keith.busch@intel.com>
[lorenzo.pieralisi@arm.com: changelog]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Jon Derrick: <jonathan.derrick@intel.com>

parent ce397d21

drivers/pci/controller/vmd.c

+12 −1

Original line number	Diff line number	Diff line
		@@ -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)

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