[+cc Christoph, Alexander] Best to wrap your emails to fit in 70 columns or so. On Wed, Jun 15, 2016 at 07:03:09PM +0000, Tang, CQ wrote: > Hi, > I am writing a driver to deal with MSI-X vector shortage. PCI local bus specification 6.8.3.2 clearly says that, software controlled aliasing can be used to solve the problem, where multiple MSI-X table entries are configured with the same vector. > pci_enable_msix() call from driver only configure the entries specified in the argument with different vectors. Does Linux provide help function to copy MSI-X table entries? I search the pci/msi source code and don't find an exported function to do that. I don't think so. > If there are such function, please tell the function name. if not, can we add such help function? > Or is driver allowed to access the MSI-X table entries directly, etc, read from one entry (configured by PCI subsystem), and write to another unused entry? I don't think drivers should fiddle with MSI-X table entries directly. That sounds like a way to confuse the PCI core. I added Christoph and Alexander because they're working on similar issues. Bjorn -- 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
