pcib allocation failure

[John Baldwin]

On Saturday, May 28, 2011 9:45:48 pm deeptech71 at gmail.com wrote:
> On Thu, May 26, 2011 at 3:40 PM, John Baldwin <jhb at freebsd.org> wrote:
> > Ohh, you have two devices behind this bridge that have prefetch ranges.
> >
> > As a hack, can you try this:
> >
> > Index: pci_pci.c
> > ===================================================================
> > --- pci_pci.c   (revision 222285)
> > +++ pci_pci.c   (working copy)
> > @@ -162,8 +162,13 @@ pcib_write_windows(struct pcib_softc *sc, int mask
> >  {
> >        device_t dev;
> >        uint32_t val;
> > +       uint16_t cmd;
> >
> >        dev = sc->dev;
> > +       cmd = pci_read_config(dev, PCIR_COMMAND, 2);
> > +       if (cmd & (PCIM_CMD_PORTEN | PCIM_CMD_MEMEN))
> > +               pci_write_config(dev, PCIR_COMMAND,
> > +                   cmd & ~(PCIM_CMD_PORTEN | PCIM_CMD_MEMEN), 2);
> >        if (sc->io.valid && mask & WIN_IO) {
> >                val = pci_read_config(dev, PCIR_IOBASEL_1, 1);
> >                if ((val & PCIM_BRIO_MASK) == PCIM_BRIO_32) {
> > @@ -192,6 +197,8 @@ pcib_write_windows(struct pcib_softc *sc, int mask
> >                pci_write_config(dev, PCIR_PMBASEL_1, sc->pmem.base >> 16, 
2);
> >                pci_write_config(dev, PCIR_PMLIMITL_1, sc->pmem.limit >> 
16, 2);
> >        }
> > +       if (cmd & (PCIM_CMD_PORTEN | PCIM_CMD_MEMEN))
> > +               pci_write_config(dev, PCIR_COMMAND, cmd, 2);
> >  }
> >
> >  static void
> > @@ -337,6 +344,9 @@ pcib_probe_windows(struct pcib_softc *sc)
> >                            pci_read_config(dev, PCIR_PMLIMITL_1, 2));
> >                        max = 0xffffffff;
> >                }
> > +               /* XXX: Testing hack */
> > +               if (device_get_unit(sc->sc_dev) == 1)
> 
> i'm assuming that "sc->sc_dev" should be "dev" (this fixes a compilation 
error).
> 
> > +                       sc->pmem.limit = 0xefffffff;
> >                pcib_alloc_window(sc, &sc->pmem, SYS_RES_MEMORY,
> >                    RF_PREFETCHABLE, max);
> >        }
> 
> that seems to work!

Hmmm, ok.  This may not be easy to fix properly for the time being as it 
requires the PCI-PCI bridge to scan all the devices behind the bus to find 
what resource ranges are actually needed before programming its windows.  Note 
that this is all to work around your BIOS being very broken. :(

> btw, is my machine a test-pig for an upcoming change to the PCI bus driver?

Well, it's been a good test thus far.

-- 
John Baldwin