ath0: could not map interrupt (again?)

[Adrian Chadd]

hi,

warner says "pcie interrupts aren't shared." :-)

So why is this working? You're saying this is a mini-pci slot?

Would you please file a PR so we can get some more eyeballs on this? thanks!


-adrian
On Mon, 21 May 2018 at 12:55, Tim Chase <freebsd at tim.thechases.com> wrote:

> I've been using this for a couple weeks now with no issues, for what
> little value my OK is, your patch seems to be ready to roll.

> -tim

> On 2018-05-06 20:16, Tim Chase wrote:
> > On 2018-05-03 17:54, Oleksandr Tymoshenko wrote:
> > > Tim Chase (freebsd at tim.thechases.com) wrote:
> > > > ppb0 at pci0 dev 28 function 0 "Intel SCH PCIE" rev 0x07: apic 2
> > > > int 17 ...
> > > > athn0 at pci2 dev 0 function 0 "Atheros AR9281" rev 0x01: apic 2
> > > > int 17 athn0: AR9280 rev 2 (2T2R), ROM rev 22, address
> > > > 00:24:d2:b3:8c:b4
> > > >
> > > > so it looks like the interrupt *can* be shared, it just appears
> > > > that FreeBSD is doing something peculiar with it.
> > >
> > > It looks like PCI bridge allocates interupt without RF_SHAREABLE
> > > (see dev/pci/pci_pci.c, pcib_alloc_pcie_irq). Could you test
> > > this patch [1]? I am not sure if non-shareable IRQs for PCI/PCI
> > > bridge is a design decision or it's just that nobody has hit this
> > > problem before.
> > >
> > > [1]
> > > https://people.freebsd.org/~gonzo/patches/pci_pci-shareable-irq.diff
> >
> > Applying your one-line patch adding RF_SHAREABLE (sorry for the
> > delay as buildworld took ~2.5 days and buildkernel took about half
> > a day on this machine) does seem to have at least gotten past the
> > initial issue.  The pcib1 now looks like it's properly sharing the
> > interrupt and ath0 at least identifies.  Relevant excerpts from
> > dmesg:
> >
> > # dmesg | grep -e ath0 -e pcib1
> > pcib1: <ACPI PCI-PCI bridge> irq 17 at device 28.0 on pci0
> > pcib1: [GIANT-LOCKED]
> > pci1: <ACPI PCI bus> on pcib1
> > ath0: <Atheros 9280> mem 0xd8000000-0xd800ffff irq 17 at device 0.0
> > on pci2 ath0: [HT] enabling HT modes
> > ath0: [HT] 1 stream STBC receive enabled
> > ath0: [HT] 1 stream STBC transmit enabled
> > ath0: [HT] 2 RX streams; 2 TX streams
> > ath0: AR9280 mac 128.2 RF5133 phy 13.0
> > ath0: 2GHz radio: 0x0000; 5GHz radio: 0x00c0
> >
> > This was performed against HEAD which, at the time, was r333254.
> >
> > I'll poke at it more thoroughly in the morning, but I wanted to let
> > you know that it seems to be working thus far.
> >
> > If you know of any particular ways in which I should stress it (to
> > see if IRQ 17 on pcib1 really *wasn't* supposed to be sharable), I'd
> > be glad to abuse it a bit.
> >
> > Many thanks!
> >
> > -tim
> >
> >
> >
> >


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