Intel TigerLake NVMe vmd: Adding Support & Debugging a Patch

[Neel Chauhan]

To extend, I am getting an issue with `pci_read_device()` where it 
returns a `vid` (PCI Vendor ID) of 0xffff.

This ends up returning "Cannot allocate dinfo!" from vmd.

Log (via grep): https://imgur.com/a/tAmmY7i

-Neel

On 2020-12-30 16:38, Neel Chauhan wrote:
> Hi Chuck,
> 
> On 2020-12-30 10:04, Chuck Tuffli wrote:
>> What is the output from
>> # pciconf -rb pci0:0:14:0 0x40:0x48
> 
> The output is:
> 
> 01 00 00 00 01 2e 68 02  00
> 
>> --chuck
> 
> I was also able to stop kernel panics by adding:
> 
> rman_fini(&sc->vmd_bus.rman);
> 
> In the fail: statement in vmd_attach().
> 
> But I still cannot detect the SSD.
> 
> -Neel
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