On Mon, May 02, 2016 at 04:42:03PM +0200, Christoph Hellwig wrote: > On Mon, May 02, 2016 at 08:11:24AM -0500, Bjorn Helgaas wrote: > > On Sun, May 01, 2016 at 08:01:49PM +0200, Christoph Hellwig wrote: > > > FYI, I spent some time trying to convert more drivers to this, and > > > I think we'll need an additional flag to skip MSI or MSI-X as there > > > is plenty of hardware claiming support in the capabilities flag, > > > but not actually supporting one of them. > > > > Or maybe add a "pdev->msix_broken" bit and quirks to set it? Or if > > pci_fixup_final quirks merely cleared pdev->msix_cap, I think the PCI > > core would never try to enable MSI-X. > > Can't say I'm excited about quirks - now we'd have to patch core > code for something that previously was entirely in the driver. Yeah, you're right. I was imagining a quirk in the driver itself, but now that I look at it, I don't see any infrastructure for that. I think there are a lot of existing quirks that could be moved from the core to a driver if we had support for quirks in drivers. It just seems a shame to complicate the pci_alloc_irq_vectors() interface with flags about broken devices. I guess if we added a "pdev->msix_broken" bit, it would be visible to drivers, and they could easily set it themselves in their .probe() methods even without any actual quirk mechanism. But a flag to pci_alloc_irq_vectors() would certainly be more direct. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
