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

Randy Dunlap
2021-04-13T06:22:28Z

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On 4/12/21 11:06 PM, Mike Rapoport wrote:
> 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...
>

It's attached.

--
~Randy
{bedtime}

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