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usb: hcd: Try MSI interrupts on PCI devices

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It appears that some platforms share same IRQ line between several devices,
some of which are EHCI and OHCI controllers. This is neither practical nor
performance-wise, especially in the case when they are supporting MSI.

In order to improve the situation try to allocate MSI and fallback to legacy
IRQ if no MSI available.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200702143045.23429-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2020-07-02 17:30:45 +03:00 committed by Greg Kroah-Hartman
parent eed3c957dd
commit 306c54d0ed
1 changed files with 10 additions and 4 deletions
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14
drivers/usb/core/hcd-pci.c
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@ -194,20 +194,21 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id,
* make sure irq setup is not touched for xhci in generic hcd code
*/
if ((driver->flags & HCD_MASK) < HCD_USB3) {
if (!dev->irq) {
retval = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_LEGACY | PCI_IRQ_MSI);
if (retval < 0) {
dev_err(&dev->dev,
"Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
pci_name(dev));
retval = -ENODEV;
goto disable_pci;
}
hcd_irq = dev->irq;
hcd_irq = pci_irq_vector(dev, 0);
}
hcd = usb_create_hcd(driver, &dev->dev, pci_name(dev));
if (!hcd) {
retval = -ENOMEM;
goto disable_pci;
goto free_irq_vectors;
}
hcd->amd_resume_bug = (usb_hcd_amd_remote_wakeup_quirk(dev) &&
@ -286,6 +287,9 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id,
put_hcd:
usb_put_hcd(hcd);
free_irq_vectors:
if ((driver->flags & HCD_MASK) < HCD_USB3)
pci_free_irq_vectors(dev);
disable_pci:
pci_disable_device(dev);
dev_err(&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
@ -343,6 +347,8 @@ void usb_hcd_pci_remove(struct pci_dev *dev)
up_read(&companions_rwsem);
}
usb_put_hcd(hcd);
if ((hcd->driver->flags & HCD_MASK) < HCD_USB3)
pci_free_irq_vectors(dev);
pci_disable_device(dev);
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);
@ -454,7 +460,7 @@ static int suspend_common(struct device *dev, bool do_wakeup)
* synchronized here.
*/
if (!hcd->msix_enabled)
synchronize_irq(pci_dev->irq);
synchronize_irq(pci_irq_vector(pci_dev, 0));
/* Downstream ports from this root hub should already be quiesced, so
* there will be no DMA activity. Now we can shut down the upstream