Re: PCI resources above 4GB

[Steven Newbury <steve@snewbury.org.uk>]

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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@kernel.org> wrote:
> 
>>>> On Thu, Apr 12, 2012 at 4:22 AM, Steven Newbury 
>>>> <steve@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.
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commit fe2ccc15c3cd75af2a582dc6e2b4deb544aca307
Author: Steven Newbury <steve@snewbury.org.uk>
Date:   Sat Apr 14 19:37:32 2012 +0100

    PCI: Export pci_bus_alloc_resource_fit()

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 6d2b073..acb51bd 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -391,6 +391,7 @@ void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
 EXPORT_SYMBOL_GPL(pci_walk_bus);
 
 EXPORT_SYMBOL(pci_bus_alloc_resource);
+EXPORT_SYMBOL(pci_bus_alloc_resource_fit);
 EXPORT_SYMBOL_GPL(pci_bus_add_device);
 EXPORT_SYMBOL(pci_bus_add_devices);
 EXPORT_SYMBOL(pci_enable_bridges);