On Tue, Jun 18, 2019 at 05:15:52PM +0200, Hannes Reinecke wrote: > On 6/18/19 10:06 AM, Daniel Drake wrote: > > We can probably also use these registers for MSI support. I > > started to experiment, doesn't quite work but I'll keep poking. > > The doc suggests there is a single MSI-X vector for the AHCI SATA > > device, and AHCI MSI-X Starting Vector (AMXV) has value 0x140 on > > this platform. No idea how to interpret that value. From > > experimentation, the AHCI SATA disk generates interrupts on vector > > 0. > > > The 0x140 is probably the offset into the PCI config space where the > AHCI MSI-X vector table can be found ... An MSI-X vector table is in memory space, not config space. You'd have to look at PCI_MSIX_TABLE_BIR to find which BAR maps it, and then add PCI_MSIX_TABLE_OFFSET to the BAR value. Bjorn
