ath0: could not map interrupt (again?)

[Oleksandr Tymoshenko]

Tim Chase (freebsd at tim.thechases.com) wrote:
> On 2018-05-02 21:10, Tim Chase wrote:
> > On 2018-05-02 23:21, Adrian Chadd wrote:
> > > CAn you try booting freebsd-head and see if it's any better?  
> > 
> > At your advice, I created a boot image of 12.0-CURRENT r333017 but
> > see the same  "could not map interrupt" in my dmesg that I got on
> > 11.x
> 
> If it makes any difference, booting OpenBSD 6.3 on the machine says
> they're both successfully on INT 17 (the ath0/athn0 works there)
> 
> 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

-- 
gonzo