PCI resources above 4GB

Yinghai Lu yinghai at kernel.org
Sat Apr 14 13:48:29 PDT 2012


On Sat, Apr 14, 2012 at 12:21 PM, Steven Newbury <steve at snewbury.org.uk> wrote:
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> On 14/04/12 20:08, Steven Newbury wrote:
>> On 14/04/12 19:42, Steven Newbury wrote:
>>> On 14/04/12 19:05, Steven Newbury wrote:
>>>> On 14/04/12 18:37, Steven Newbury wrote:
>>>>> On 12/04/12 17:40, Steven Newbury wrote:
>>>>>> On Thu, 12 Apr 2012, 17:07:33 BST, Yinghai Lu
>>>>>> <yinghai at kernel.org> wrote:
>>
>>>>>>> On Thu, Apr 12, 2012 at 4:22 AM, Steven Newbury
>>>>>>> <steve at snewbury.org.uk> wrote:
>>>>>>>> Thanks, that fixed it! :) I had a similar patch I've
>>>>>>>> been working on but I had my fix in the wrong place!
>>>>>>>>
>>>>>>>> In the working case, initially the BIOS has set GMA to
>>>>>>>>  within the low system DRAM 0xC0000000 obviously
>>>>>>>> invalid. This conflict is detected and it's
>>>>>>>> relallocated to 0x12000000.
>>>>>>>>
>>>>>>>> I've attempted to modify probe.c to disable 64-bit
>>>>>>>> BARs not allocated above 4G so they get reallocated
>>>>>>>> above when possible later.  It seemed to work, but
>>>>>>>> again broke GMA despite the BAR originally containing
>>>>>>>> an invalid address as mentioned above, it seems for
>>>>>>>> some reason something is different when the conflict is
>>>>>>>> detected and rellocated, compared to disabling it early
>>>>>>>> then allocating a valid value..?
>>>>>>>>
>>>>> I've created a new quirk utilising an extra PCI resource
>>>>> flag to force reallocation of the resource.  It's the first
>>>>> approach I've had any success at.  It does work.  Only
>>>>> "Intel Page Flush" now gets allocated @0xe0000000!
>>
>>
>>>> Hopefully this should fix "Intel Flush Page"
>>> Need to export pci_bus_alloc_resource_fit for intel-gtt.
>> Nearly worked... Or at least it should have worked, but for some
>> reason the allocator failed to utilise 0xe0000000-0xefffffff for
>> 04:00.0 BAR0..?
>>
>>
>> pci 0000:03:08.0: BAR 15: can't assign mem pref (size 0x18000000)
> Ah! Not enough space for the bridge window!:(
>

please append pci=norom ...

Yinghai


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