Re: [BUG] rk3399-rockpro64 pcie synchronous external abort

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On Mon, Nov 11, 2019 at 7:03 PM Bjorn Helgaas <helgaas@xxxxxxxxxx> wrote:
>
> On Sun, Nov 10, 2019 at 10:43:48AM -0500, Peter Geis wrote:
>
> > I plugged in an i350 two port nic and examined the assigned address spaces.
> > I've attached it below.
> > Judging by the usage, I think this controller has enough address space
> > for another two port NIC, and that's about it.
> > I'm pretty sure now that the rk3399 controller just doesn't have the
> > address space to map larger devices.
> > I'm pretty sure the IOMMU would allow us to address system memory as
> > pcie address space and overcome this limitation, but I don't know how
> > to do that.
>
> I don't think you're out of MMIO space, at least in this instance.  It
> looks like you have 32MB available and the two-port NIC on bus 01 only
> takes 5MB.
>
> The IOMMU is used for DMA (e.g., reads/writes initiated by the NIC),
> while the MMIO space is used for CPU programmed I/O (reads/writes done
> by the driver running on the CPU).
>
> > The address space for the nic is below:
> > f8000000-f8ffffff : axi-base
> > fa000000-fbdfffff : MEM
>
> 32MB.
>
> >   fa000000-fa4fffff : PCI Bus 0000:01
>
> 5MB.
Just a note, this is not the device that triggered the bug.
This is a i350 NIC, i posted it as a comparison to my original email.
>
> >     fa000000-fa07ffff : 0000:01:00.0
> >       fa000000-fa07ffff : igb
> >     fa080000-fa0fffff : 0000:01:00.0
> >     fa100000-fa17ffff : 0000:01:00.1
> >       fa100000-fa17ffff : igb
> >     fa180000-fa1fffff : 0000:01:00.1
> >     fa200000-fa27ffff : 0000:01:00.0
> >     fa280000-fa2fffff : 0000:01:00.0
> >     fa300000-fa37ffff : 0000:01:00.1
> >     fa380000-fa3fffff : 0000:01:00.1
> >     fa400000-fa403fff : 0000:01:00.0
> >       fa400000-fa403fff : igb
> >     fa404000-fa407fff : 0000:01:00.1
> >       fa404000-fa407fff : igb
> > fd000000-fdffffff : f8000000.pcie



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