RE: Latest 2.4 IA64 Baseline (Bjorn) + Latest ACPI testing report

From: Yu, Luming <luming.yu_at_intel.com>
Date: 2003-12-16 20:37:35
>> > >> 3.alloc 0x0-0xcf7 from PCI IO for PCI Bus 00:00 failed   (Known issue)
>> > 
>> > Since VGA console driver faile to allocate that port range,  why it still can work?
>> > Does it mean 0x3c0-0x3df is inessential to  VGA console driver.
>> 
>> No, I think those ports are essential.  The driver just uses them,
>> even if the allocation fails.  I have a 2.6 patch that cleans this
>> up.  It doesn't change any functionality; it just gets rid of the
>> message and makes /proc/ioports more correct.  I'll submit it as
>> soon as it makes sense to put non-critical changes into 2.6.

>I didn't answer this quite right.  The VGA driver allocates ports
>0x3c0-0x3df early, and that allocation succeeds.  Later, we
>discover the PCI root bridges, and try to allocate the port ranges
>for each.  It's the PCI root bridge allocation that fails, because
>it's trying to allocate a range that includes the VGA ports.

>So we end up with something like this in /proc/ioports (this is a
>made-up example, but same idea):
>
>	000003c0-000003df : vga+
>	00004000-00009fff : PCI Bus 00:00
>	  00004000-000040ff : sym53c8xx
>	  00004100-000041ff : sym53c8xx
>
>when we should have this:
>
>	00000000-00000cf7 : PCI Bus 00:00
>	  000003c0-000003df : vga+
>	00004000-00009fff : PCI Bus 00:00
>	  00004000-000040ff : sym53c8xx
>	  00004100-000041ff : sym53c8xx
>
>The patch just changes the PCI root bridge allocation so that
>instead of failing if part of the range has already been allocated,
>it inserts a new range up one level, so it encloses the previous
>VGA allocation.

Could you let me see what are you patch doing.  

I think  "To bus device, resources returned from _CRS method means that bus device will
supply those resouces to its children devices. So it's unreasonable to call
request_resource for them."

I have a patch for above statement.  Please take http://bugzilla.kernel.org/show_bug.cgi?id=1685 a look.

Thanks,
Luming
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Received on Tue Dec 16 04:37:55 2003

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