Re: [PATCH] PCI: Add Intel remapped NVMe device support

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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



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