Re: linux-next: Tree for Apr 9 (x86 boot problem)

Mike Rapoport
2021-04-13T06:06:44Z

Hi Randy,

On Mon, Apr 12, 2021 at 01:53:34PM -0700, Randy Dunlap wrote:
> On 4/12/21 10:01 AM, Mike Rapoport wrote:
> > On Mon, Apr 12, 2021 at 08:49:49AM -0700, Randy Dunlap wrote:
> >
> > I thought about adding some prints to see what's causing the hang, the
> > reservations or their absence. Can you replace the debug patch with this
> > one:
> >
> > diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> > index 776fc9b3fafe..a10ac252dbcc 100644
> > --- a/arch/x86/kernel/setup.c
> > +++ b/arch/x86/kernel/setup.c
> > @@ -600,10 +600,13 @@ static bool __init snb_gfx_workaround_needed(void)
> > return false;
> >
> > vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
> > + devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
> > +
> > + pr_info("%s: vendor: %x, device: %x\n", __func__, vendor, device);
>
> s/device)/devid)/

Oh, sorry.

> > +
> > if (vendor != 0x8086)
> > return false;
> >
> > - devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
> > for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
> > if (devid == snb_ids[i])
> > return true;
>
> That prints:
>
> [ 0.000000] snb_gfx_workaround_needed: vendor: 8086, device: 126
> [ 0.000000] early_reserve_memory: snb_gfx: 1
> ...
> [ 0.014061] snb_gfx_workaround_needed: vendor: 8086, device: 126
> [ 0.014064] reserving inaccessible SNB gfx pages
>
>
> The full boot log is attached.

Can you please send the log with memblock=debug added to the kernel command
line?

Probably should have started from this...

--
Sincerely yours,
Mike.