Re: Enabling MSI on the Asus Vintage AH-1

Pyun YongHyeon wrote:
On Sat, Dec 23, 2006 at 09:54:58PM +0000, Bruce M. Simpson wrote:
> Hi,
> > It looks like MSI was detected, but not used by the msk(4) driver on the > Asus Vintage AH-1.
> > This is a uniprocessor Athlon64 system. The PCI bridges on this system > aren't in the MSI blacklist, however, there are several odd messages > regarding a non-default MSI window. Looking at the code suggests it > expects to see the MSI window at 0xfee00000.
> > BTW: This system's on-board SATA controller stopped working with 6.2-RC, > so I'm using an add-on PCI-e card for SATA to connect the root disk.
> > pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
> pci0: <ACPI PCI bus> on pcib0
> pci0: physical bus=0

[...]

> pcib2: <ACPI PCI-PCI bridge> at device 6.0 on pci0
> pcib2: secondary bus 2
> pcib2: subordinate bus 2
> pcib2: I/O decode 0xc000-0xcfff
> pcib2: memory decode 0xfe400000-0xfe4fffff
> pcib2: no prefetched decode
> pci2: <ACPI PCI bus> on pcib2
> pci2: physical bus=2
> found-> vendor=0x11ab, dev=0x4362, revid=0x19
> bus=2, slot=0, func=0
> class=02-00-00, hdrtype=0x00, mfdev=0
> cmdreg=0x0107, statreg=0x4010, cachelnsz=16 (dwords)
> lattimer=0x00 (0 ns), mingnt=0x00 (0 ns), maxlat=0x00 (0 ns)
> intpin=a, irq=5
> powerspec 2 supports D0 D1 D2 D3 current D0
> VPD Ident: Marvell Yukon 88E8053 Gigabit Ethernet Controller
> PN: Yukon 88E8053
> EC: Rev. 1.9
> MN: Marvell
> SN: AbCdEfG32a88a
> CP: id 1, BAR16, off 0x3cc
> RV: 0x24
> MSI supports 2 messages, 64 bit
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
I think Yukon II supports one MSI message. But all systems I know
reported that it supports two MSI messages. This is main reason why
msk(4) doesn't use MSI ATM. I don't know why Yukon II claims to
support two MSI messages.(for dual port MAC configuraiton?)

My guess is that it advertises 2 messages for the dual-port configuration. The intention is probably that the driver would
run a loop where it allocates a message as it configures each port.
So if you only have a single port, then you only allocate a single
message and ignore the other one. This looks like it will be hard to
fit into the msk+mskc code that is there right now.


You can force to use MSI by assigning 'msic = 1' before calling
pci_alloc_msi(9) in mskc_attach(). However it wouldn't work if you
reload the msk(4) again. Other than that it works well with MSI.

I don't understand why there would be a failure here. Can you explain?

Scott
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