linux-kernel - Re: [PATCH] x86: Reserve legacy VGA MMIO area for x86_64 as well as x86

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Date:	Fri, 09 Apr 2010 19:46:04 -0700
From:	Yinghai <yinghai.lu@...cle.com>
To:	Andy Isaacson <adi@...apodia.org>
CC:	guenter.roeck@...csson.com, "H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Renninger <trenn@...e.de>
Subject: Re: [PATCH] x86: Reserve legacy VGA MMIO area for x86_64 as well
 as x86_32

On 04/09/2010 06:57 PM, Andy Isaacson wrote:
> On Fri, Apr 09, 2010 at 06:48:31PM -0700, Yinghai wrote:
>> On 04/09/2010 06:43 PM, Andy Isaacson wrote:
>>> On Fri, Apr 09, 2010 at 06:10:49PM -0700, Yinghai wrote:
>>>> in addition to -v2 patch
>>>>
>>>> please apply this patch too
>>>>
>>>> also please boot with "debug" in boot command line.
>>>>
>>>> Thanks
>>>>
>>>> Yinghai
>>>>
>>>> [PATCH] x86,acpi: use request_resource instead of instead of insert_resource
>>>>
>>>> So make pci root resouce from _CRS honor the one We reserve in e820 below 1M
>>>>
>>>> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>>>>
>>>> ---
>>>>  arch/x86/pci/acpi.c |    2 +-
>>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> Index: linux-2.6/arch/x86/pci/acpi.c
>>>> ===================================================================
>>>> --- linux-2.6.orig/arch/x86/pci/acpi.c
>>>> +++ linux-2.6/arch/x86/pci/acpi.c
>>>> @@ -168,7 +168,7 @@ setup_resource(struct acpi_resource *acp
>>>>  		return AE_OK;
>>>>  	}
>>>>  
>>>> -	conflict = insert_resource_conflict(root, res);
>>>> +	conflict = request_resource_conflict(root, res);
>>>>  	if (conflict) {
>>>>  		dev_err(&info->bridge->dev,
>>>>  			"address space collision: host bridge window %pR "
>>>
>>> That works.  dmesg.gz attached (I'm pretty sure I'm skating close to
>>> vger's size limit without gz).  "debug" didn't seem to make much
>>> difference?
>>
>> [    0.636805] ACPI: PCI Root Bridge [PCI0] (0000:00)
>> [    0.654025] pci_root PNP0A03:00: address space collision: host bridge window [io  0x0000-0x0cf7] conflicts with dma1 [io  0x0000-0x001f]
>> [    0.654370] pci_root PNP0A03:00: host bridge window [io  0x0d00-0xffff]
>> [    0.654586] pci_root PNP0A03:00: address space collision: host bridge window [mem 0x000a0000-0x000bffff] conflicts with reserved [mem 0x000a0000-0x000fffff]
>> [    0.654933] pci_root PNP0A03:00: address space collision: host bridge window [mem 0x000c0000-0x000effff] conflicts with reserved [mem 0x000a0000-0x000fffff]
>> [    0.655002] pci_root PNP0A03:00: address space collision: host bridge window [mem 0x000f0000-0x000fffff] conflicts with reserved [mem 0x000a0000-0x000fffff]
>> [    0.655367] pci_root PNP0A03:00: host bridge window [mem 0xf0000000-0xfebfffff]
>> [    0.655706] pci_root PNP0A03:00: host bridge window [mem 0xbff00000-0xdfffffff]
>> [    0.656003] pci_root PNP0A03:00: host bridge window [mem 0xff980800-0xff980bff]
>> [    0.656360] pci_root PNP0A03:00: host bridge window [mem 0xff97c000-0xff97ffff]
>> [    0.657002] pci_root PNP0A03:00: host bridge window [mem 0xfed20000-0xfed9ffff]
>>
>> still not optimal.
> 
> Well, thanks for looking at it; if there are any more patches I can try,
> let me know (but I may not get to it until Monday morning, since I can't
> reliably reboot this machine remotely).
> 
> Is this a BIOS error?  I am currently running A04; there's an A10
> available, but I didn't want to perturb the situation during the
> debugging cycle without guidance.

thanks.

please use this one replace second patch
[PATCH] x86,pci, acpi: Inherent BUSY flag when setup_resource for root bus

So make pci root resource from _CRS honor the range We reserve in e820 below 1M

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 arch/x86/pci/acpi.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux-2.6/arch/x86/pci/acpi.c
===================================================================
--- linux-2.6.orig/arch/x86/pci/acpi.c
+++ linux-2.6/arch/x86/pci/acpi.c
@@ -175,6 +175,10 @@ setup_resource(struct acpi_resource *acp
 			"conflicts with %s %pR\n",
 			res, conflict->name, conflict);
 	} else {
+		/* In case it falls in big reserved region */
+		if (res->parent->flags & IORESOURCE_BUSY)
+			res->flags |= IORESOURCE_BUSY;
+
 		pci_bus_add_resource(info->bus, res, 0);
 		info->res_num++;
 		if (addr.translation_offset)
--
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