[BUG] pnpbios breaks floppy support

[BUG] pnpbios breaks floppy support

[Philippe De Muyter]

Hello linux experts,

Today I tried to upgrade a PC's kernel from 2.6.11 to 2.6.22, and
I saw some strange messages when booting :

	Floppy drive(s): fd0 is 1.44M
	floppy0: Floppy io-port 0x03f2 in use

Previously, I had :

	Floppy drive(s): fd0 is 1.44M
	FDC 0 is a post-1991 82077

Needless to say, my floppy hardware works perfectly, and my floppy
was usable with the old kernel, while the floppy is now inaccessible
with the new kernel.  Even /dev/fd0 does not exist anymore.

Searching for a cause to that problem, I saw the following messages
before the floppy probe in the new kernel :

	PnPBIOS: Scanning system for PnP BIOS support...
	PnPBIOS: Found PnP BIOS installation structure at 0xc00fd5e0
	PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0x5ba3, dseg 0xf0000
	PnPBIOS: 17 nodes reported by PnP BIOS; 17 recorded by driver
	[...]
	pnp: 00:07: ioport range 0x3f0-0x3f1 has been reserved
	pnp: 00:07: ioport range 0x3f3-0x3f3 has been reserved
	[...]

Searching the web and the outdated pnp kernel documentation, I
finally found an option to add to my kernel parameters line :

	pnpbios=off

Now my floppy works again, but I am not really satisfied.

What do I loose with the 'pnpbios=off' option ?

Isn't there a smoother option to allow pnpbios but avoiding to reserve
floppy's io-ports ?

Should I modify rather /drivers/block/floppy.c or /drivers/pnp/*.c
to make pnpbios and floppy driver coexist peacefully ? And is there
an example of such modifications for other standard peripherals ?

Thanks for reading this far

Philippe

Re: [BUG] pnpbios breaks floppy support

[Robert Hancock]

Philippe De Muyter wrote:
> Hello linux experts,
> 
> Today I tried to upgrade a PC's kernel from 2.6.11 to 2.6.22, and
> I saw some strange messages when booting :
> 
> 	Floppy drive(s): fd0 is 1.44M
> 	floppy0: Floppy io-port 0x03f2 in use
> 
> Previously, I had :
> 
> 	Floppy drive(s): fd0 is 1.44M
> 	FDC 0 is a post-1991 82077
> 
> Needless to say, my floppy hardware works perfectly, and my floppy
> was usable with the old kernel, while the floppy is now inaccessible
> with the new kernel.  Even /dev/fd0 does not exist anymore.
> 
> Searching for a cause to that problem, I saw the following messages
> before the floppy probe in the new kernel :
> 
> 	PnPBIOS: Scanning system for PnP BIOS support...
> 	PnPBIOS: Found PnP BIOS installation structure at 0xc00fd5e0
> 	PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0x5ba3, dseg 0xf0000
> 	PnPBIOS: 17 nodes reported by PnP BIOS; 17 recorded by driver
> 	[...]
> 	pnp: 00:07: ioport range 0x3f0-0x3f1 has been reserved
> 	pnp: 00:07: ioport range 0x3f3-0x3f3 has been reserved
> 	[...]
> 
> Searching the web and the outdated pnp kernel documentation, I
> finally found an option to add to my kernel parameters line :
> 
> 	pnpbios=off
> 
> Now my floppy works again, but I am not really satisfied.
> 
> What do I loose with the 'pnpbios=off' option ?
> 
> Isn't there a smoother option to allow pnpbios but avoiding to reserve
> floppy's io-ports ?
> 
> Should I modify rather /drivers/block/floppy.c or /drivers/pnp/*.c
> to make pnpbios and floppy driver coexist peacefully ? And is there
> an example of such modifications for other standard peripherals ?

Presumably the problem is that your BIOS marks the IO ports used by the 
floppy controller as reserved which prevents the floppy driver from 
binding to them. (2.6.11 probably was before we even processed PnP 
reserved regions.)

I think we now have handling for the case where the reservations overlap 
PCI devices, but I think it's the first I've heard of them overlapping 
the floppy IO ports..

Re: [BUG] pnpbios breaks floppy support

[Philippe De Muyter]

On Sun, Feb 01, 2009 at 01:08:33AM -0600, Robert Hancock wrote:
> Philippe De Muyter wrote:
>> Hello linux experts,
>> Today I tried to upgrade a PC's kernel from 2.6.11 to 2.6.22, and
>> I saw some strange messages when booting :
>> 	Floppy drive(s): fd0 is 1.44M
>> 	floppy0: Floppy io-port 0x03f2 in use
>> Previously, I had :
>> 	Floppy drive(s): fd0 is 1.44M
>> 	FDC 0 is a post-1991 82077
>> Needless to say, my floppy hardware works perfectly, and my floppy
>> was usable with the old kernel, while the floppy is now inaccessible
>> with the new kernel.  Even /dev/fd0 does not exist anymore.
>> Searching for a cause to that problem, I saw the following messages
>> before the floppy probe in the new kernel :
>> 	PnPBIOS: Scanning system for PnP BIOS support...
>> 	PnPBIOS: Found PnP BIOS installation structure at 0xc00fd5e0
>> 	PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0x5ba3, dseg 0xf0000
>> 	PnPBIOS: 17 nodes reported by PnP BIOS; 17 recorded by driver
>> 	[...]
>> 	pnp: 00:07: ioport range 0x3f0-0x3f1 has been reserved
>> 	pnp: 00:07: ioport range 0x3f3-0x3f3 has been reserved
>> 	[...]
>> Searching the web and the outdated pnp kernel documentation, I
>> finally found an option to add to my kernel parameters line :
>> 	pnpbios=off
>> Now my floppy works again, but I am not really satisfied.
>> What do I loose with the 'pnpbios=off' option ?
>> Isn't there a smoother option to allow pnpbios but avoiding to reserve
>> floppy's io-ports ?
>> Should I modify rather /drivers/block/floppy.c or /drivers/pnp/*.c
>> to make pnpbios and floppy driver coexist peacefully ? And is there
>> an example of such modifications for other standard peripherals ?
>
> Presumably the problem is that your BIOS marks the IO ports used by the 
> floppy controller as reserved which prevents the floppy driver from binding 
> to them. (2.6.11 probably was before we even processed PnP reserved 
> regions.)
>
> I think we now have handling for the case where the reservations overlap 
> PCI devices, but I think it's the first I've heard of them overlapping the 
> floppy IO ports..

I should have added that, when started with pnpbios enabled, 
I have found the following in /sys/devices/pnp0/ :

	$ cat 00:03/id
	PNP0700
	$ cat 00:03/resources 
	state = active
	io 0x3f4-0x3f5
	io 0x3f2-0x3f2
	irq 6
	dma 2
	$ cat 00:03/options
	port 0x3f4-0x3f4, align 0x0, size 0x2, 16-bit address decoding
	port 0x3f2-0x3f2, align 0x0, size 0x1, 16-bit address decoding
	irq 6 High-Edge
	dma 2 8-bit compatible

AFAIK, PNP0700 is the pnp id for the standard floppy disk,
and the resources and options files describe the expected io-ports
of the floppy disk, so this does not seem to be an error in the bios.

Philippe

Re: [BUG] pnpbios breaks floppy support

[Robert Hancock]

Philippe De Muyter wrote:
> On Sun, Feb 01, 2009 at 01:08:33AM -0600, Robert Hancock wrote:
>> Philippe De Muyter wrote:
>>> Hello linux experts,
>>> Today I tried to upgrade a PC's kernel from 2.6.11 to 2.6.22, and
>>> I saw some strange messages when booting :
>>> 	Floppy drive(s): fd0 is 1.44M
>>> 	floppy0: Floppy io-port 0x03f2 in use
>>> Previously, I had :
>>> 	Floppy drive(s): fd0 is 1.44M
>>> 	FDC 0 is a post-1991 82077
>>> Needless to say, my floppy hardware works perfectly, and my floppy
>>> was usable with the old kernel, while the floppy is now inaccessible
>>> with the new kernel.  Even /dev/fd0 does not exist anymore.
>>> Searching for a cause to that problem, I saw the following messages
>>> before the floppy probe in the new kernel :
>>> 	PnPBIOS: Scanning system for PnP BIOS support...
>>> 	PnPBIOS: Found PnP BIOS installation structure at 0xc00fd5e0
>>> 	PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0x5ba3, dseg 0xf0000
>>> 	PnPBIOS: 17 nodes reported by PnP BIOS; 17 recorded by driver
>>> 	[...]
>>> 	pnp: 00:07: ioport range 0x3f0-0x3f1 has been reserved
>>> 	pnp: 00:07: ioport range 0x3f3-0x3f3 has been reserved
>>> 	[...]
>>> Searching the web and the outdated pnp kernel documentation, I
>>> finally found an option to add to my kernel parameters line :
>>> 	pnpbios=off
>>> Now my floppy works again, but I am not really satisfied.
>>> What do I loose with the 'pnpbios=off' option ?
>>> Isn't there a smoother option to allow pnpbios but avoiding to reserve
>>> floppy's io-ports ?
>>> Should I modify rather /drivers/block/floppy.c or /drivers/pnp/*.c
>>> to make pnpbios and floppy driver coexist peacefully ? And is there
>>> an example of such modifications for other standard peripherals ?
>> Presumably the problem is that your BIOS marks the IO ports used by the 
>> floppy controller as reserved which prevents the floppy driver from binding 
>> to them. (2.6.11 probably was before we even processed PnP reserved 
>> regions.)
>>
>> I think we now have handling for the case where the reservations overlap 
>> PCI devices, but I think it's the first I've heard of them overlapping the 
>> floppy IO ports..
> 
> I should have added that, when started with pnpbios enabled, 
> I have found the following in /sys/devices/pnp0/ :
> 
> 	$ cat 00:03/id
> 	PNP0700
> 	$ cat 00:03/resources 
> 	state = active
> 	io 0x3f4-0x3f5
> 	io 0x3f2-0x3f2
> 	irq 6
> 	dma 2
> 	$ cat 00:03/options
> 	port 0x3f4-0x3f4, align 0x0, size 0x2, 16-bit address decoding
> 	port 0x3f2-0x3f2, align 0x0, size 0x1, 16-bit address decoding
> 	irq 6 High-Edge
> 	dma 2 8-bit compatible
> 
> AFAIK, PNP0700 is the pnp id for the standard floppy disk,
> and the resources and options files describe the expected io-ports
> of the floppy disk, so this does not seem to be an error in the bios.

There's likely another resource with id of PNP0C01 or PNP0C02 
(Motherboard resources) which contains that same IO port range.

Re: [BUG] pnpbios breaks floppy support

[Adam M Belay]

Quoting Robert Hancock <hancockrwd@gmail.com>:

> Philippe De Muyter wrote:
>> On Sun, Feb 01, 2009 at 01:08:33AM -0600, Robert Hancock wrote:
>>> Philippe De Muyter wrote:
>>>> Hello linux experts,
>>>> Today I tried to upgrade a PC's kernel from 2.6.11 to 2.6.22, and
>>>> I saw some strange messages when booting :
>>>> 	Floppy drive(s): fd0 is 1.44M
>>>> 	floppy0: Floppy io-port 0x03f2 in use
>>>> Previously, I had :
>>>> 	Floppy drive(s): fd0 is 1.44M
>>>> 	FDC 0 is a post-1991 82077
>>>> Needless to say, my floppy hardware works perfectly, and my floppy
>>>> was usable with the old kernel, while the floppy is now inaccessible
>>>> with the new kernel.  Even /dev/fd0 does not exist anymore.
>>>> Searching for a cause to that problem, I saw the following messages
>>>> before the floppy probe in the new kernel :
>>>> 	PnPBIOS: Scanning system for PnP BIOS support...
>>>> 	PnPBIOS: Found PnP BIOS installation structure at 0xc00fd5e0
>>>> 	PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0x5ba3, dseg 0xf0000
>>>> 	PnPBIOS: 17 nodes reported by PnP BIOS; 17 recorded by driver
>>>> 	[...]
>>>> 	pnp: 00:07: ioport range 0x3f0-0x3f1 has been reserved
>>>> 	pnp: 00:07: ioport range 0x3f3-0x3f3 has been reserved
>>>> 	[...]
>>>> Searching the web and the outdated pnp kernel documentation, I
>>>> finally found an option to add to my kernel parameters line :
>>>> 	pnpbios=off
>>>> Now my floppy works again, but I am not really satisfied.
>>>> What do I loose with the 'pnpbios=off' option ?
>>>> Isn't there a smoother option to allow pnpbios but avoiding to reserve
>>>> floppy's io-ports ?
>>>> Should I modify rather /drivers/block/floppy.c or /drivers/pnp/*.c
>>>> to make pnpbios and floppy driver coexist peacefully ? And is there
>>>> an example of such modifications for other standard peripherals ?
>>> Presumably the problem is that your BIOS marks the IO ports used by 
>>> the floppy controller as reserved which prevents the floppy driver 
>>> from binding to them. (2.6.11 probably was before we even processed 
>>> PnP reserved regions.)
>>>
>>> I think we now have handling for the case where the reservations 
>>> overlap PCI devices, but I think it's the first I've heard of them 
>>> overlapping the floppy IO ports..
>>
>> I should have added that, when started with pnpbios enabled, I have 
>> found the following in /sys/devices/pnp0/ :
>>
>> 	$ cat 00:03/id
>> 	PNP0700
>> 	$ cat 00:03/resources 	state = active
>> 	io 0x3f4-0x3f5
>> 	io 0x3f2-0x3f2
>> 	irq 6
>> 	dma 2
>> 	$ cat 00:03/options
>> 	port 0x3f4-0x3f4, align 0x0, size 0x2, 16-bit address decoding
>> 	port 0x3f2-0x3f2, align 0x0, size 0x1, 16-bit address decoding
>> 	irq 6 High-Edge
>> 	dma 2 8-bit compatible
>>
>> AFAIK, PNP0700 is the pnp id for the standard floppy disk,
>> and the resources and options files describe the expected io-ports
>> of the floppy disk, so this does not seem to be an error in the bios.
>
> There's likely another resource with id of PNP0C01 or PNP0C02 
> (Motherboard resources) which contains that same IO port range.
>

Yes, could you post the same information for 00:07 so we can start to narrow
this down?  Also having "cat /proc/ioports" couldn't hurt.

Thanks,
Adam

Re: [BUG] pnpbios breaks floppy support

[Philippe De Muyter]

On Sun, Feb 01, 2009 at 03:48:49PM -0500, Adam M Belay wrote:
> Quoting Robert Hancock <hancockrwd@gmail.com>:
>
>> Philippe De Muyter wrote:
>>> On Sun, Feb 01, 2009 at 01:08:33AM -0600, Robert Hancock wrote:
>>>> Philippe De Muyter wrote:
>>>>> Hello linux experts,
>>>>> Today I tried to upgrade a PC's kernel from 2.6.11 to 2.6.22, and
>>>>> I saw some strange messages when booting :
>>>>> 	Floppy drive(s): fd0 is 1.44M
>>>>> 	floppy0: Floppy io-port 0x03f2 in use
>>>>> Previously, I had :
>>>>> 	Floppy drive(s): fd0 is 1.44M
>>>>> 	FDC 0 is a post-1991 82077
>>>>> Needless to say, my floppy hardware works perfectly, and my floppy
>>>>> was usable with the old kernel, while the floppy is now inaccessible
>>>>> with the new kernel.  Even /dev/fd0 does not exist anymore.
>>>>> Searching for a cause to that problem, I saw the following messages
>>>>> before the floppy probe in the new kernel :
>>>>> 	PnPBIOS: Scanning system for PnP BIOS support...
>>>>> 	PnPBIOS: Found PnP BIOS installation structure at 0xc00fd5e0
>>>>> 	PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0x5ba3, dseg 0xf0000
>>>>> 	PnPBIOS: 17 nodes reported by PnP BIOS; 17 recorded by driver
>>>>> 	[...]
>>>>> 	pnp: 00:07: ioport range 0x3f0-0x3f1 has been reserved
>>>>> 	pnp: 00:07: ioport range 0x3f3-0x3f3 has been reserved
>>>>> 	[...]
>>>>> Searching the web and the outdated pnp kernel documentation, I
>>>>> finally found an option to add to my kernel parameters line :
>>>>> 	pnpbios=off
>>>>> Now my floppy works again, but I am not really satisfied.
>>>>> What do I loose with the 'pnpbios=off' option ?
>>>>> Isn't there a smoother option to allow pnpbios but avoiding to reserve
>>>>> floppy's io-ports ?
>>>>> Should I modify rather /drivers/block/floppy.c or /drivers/pnp/*.c
>>>>> to make pnpbios and floppy driver coexist peacefully ? And is there
>>>>> an example of such modifications for other standard peripherals ?
>>>> Presumably the problem is that your BIOS marks the IO ports used by the 
>>>> floppy controller as reserved which prevents the floppy driver from 
>>>> binding to them. (2.6.11 probably was before we even processed PnP 
>>>> reserved regions.)
>>>>
>>>> I think we now have handling for the case where the reservations overlap 
>>>> PCI devices, but I think it's the first I've heard of them overlapping 
>>>> the floppy IO ports..
>>>
>>> I should have added that, when started with pnpbios enabled, I have found 
>>> the following in /sys/devices/pnp0/ :
>>>
>>> 	$ cat 00:03/id
>>> 	PNP0700
>>> 	$ cat 00:03/resources 	state = active
>>> 	io 0x3f4-0x3f5
>>> 	io 0x3f2-0x3f2
>>> 	irq 6
>>> 	dma 2
>>> 	$ cat 00:03/options
>>> 	port 0x3f4-0x3f4, align 0x0, size 0x2, 16-bit address decoding
>>> 	port 0x3f2-0x3f2, align 0x0, size 0x1, 16-bit address decoding
>>> 	irq 6 High-Edge
>>> 	dma 2 8-bit compatible
>>>
>>> AFAIK, PNP0700 is the pnp id for the standard floppy disk,
>>> and the resources and options files describe the expected io-ports
>>> of the floppy disk, so this does not seem to be an error in the bios.
>>
>> There's likely another resource with id of PNP0C01 or PNP0C02 (Motherboard 
>> resources) which contains that same IO port range.
>>
>
> Yes, could you post the same information for 00:07 so we can start to 
> narrow
> this down?  Also having "cat /proc/ioports" couldn't hurt.

Here it is, and that shows that you are thus both really experts in that area :

	$ cat 00:07/id 00:07/resources
	PNP0c02
	state = active
	io 0x80-0x80
	io 0x10-0x1f
	io 0x22-0x3f
	io 0x44-0x5f
	io 0x90-0x9f
	io 0xa2-0xbf
	io 0x3f0-0x3f1
	io 0x3f3-0x3f3
	mem 0x100000-0xc0fffff
	mem 0xfff80000-0xfff94fff
	mem 0xfff98000-0xfffbffff
	mem 0xfffc0000-0xffffffff

	$ cat /proc/ioports 
	0000-001f : dma1
	0020-0021 : pic1
	0040-0043 : timer0
	0050-0053 : timer1
	0060-006f : keyboard
	0070-0077 : rtc
	0080-008f : dma page reg
	00a0-00a1 : pic2
	00c0-00df : dma2
	00f0-00ff : fpu
	0170-0177 : 0000:00:07.1
	  0170-0177 : libata
	01f0-01f7 : 0000:00:07.1
	  01f0-01f7 : libata
	02f8-02ff : serial
	0376-0376 : 0000:00:07.1
	  0376-0376 : libata
	0378-037a : parport0
	037b-037f : parport0
	03c0-03df : vga+
	03f0-03f1 : pnp 00:07
	03f3-03f3 : pnp 00:07
	03f6-03f6 : 0000:00:07.1
	  03f6-03f6 : libata
	03f8-03ff : serial
	04d0-04d1 : pnp 00:11
	0cf8-0cff : PCI conf1
	ec00-ec7f : 0000:00:03.0
	  ec00-ec7f : tulip
	ecf0-ecff : 0000:00:07.1
	  ecf0-ecff : libata

Thanks for your quick answers.  Feel free to ask more info's

Philippe

Re: [BUG] pnpbios breaks floppy support

[Robert Hancock]

Philippe De Muyter wrote:
> On Sun, Feb 01, 2009 at 03:48:49PM -0500, Adam M Belay wrote:
>> Quoting Robert Hancock <hancockrwd@gmail.com>:
>>
>>> Philippe De Muyter wrote:
>>>> On Sun, Feb 01, 2009 at 01:08:33AM -0600, Robert Hancock wrote:
>>>>> Philippe De Muyter wrote:
>>>>>> Hello linux experts,
>>>>>> Today I tried to upgrade a PC's kernel from 2.6.11 to 2.6.22, and
>>>>>> I saw some strange messages when booting :
>>>>>> 	Floppy drive(s): fd0 is 1.44M
>>>>>> 	floppy0: Floppy io-port 0x03f2 in use
>>>>>> Previously, I had :
>>>>>> 	Floppy drive(s): fd0 is 1.44M
>>>>>> 	FDC 0 is a post-1991 82077
>>>>>> Needless to say, my floppy hardware works perfectly, and my floppy
>>>>>> was usable with the old kernel, while the floppy is now inaccessible
>>>>>> with the new kernel.  Even /dev/fd0 does not exist anymore.
>>>>>> Searching for a cause to that problem, I saw the following messages
>>>>>> before the floppy probe in the new kernel :
>>>>>> 	PnPBIOS: Scanning system for PnP BIOS support...
>>>>>> 	PnPBIOS: Found PnP BIOS installation structure at 0xc00fd5e0
>>>>>> 	PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0x5ba3, dseg 0xf0000
>>>>>> 	PnPBIOS: 17 nodes reported by PnP BIOS; 17 recorded by driver
>>>>>> 	[...]
>>>>>> 	pnp: 00:07: ioport range 0x3f0-0x3f1 has been reserved
>>>>>> 	pnp: 00:07: ioport range 0x3f3-0x3f3 has been reserved
>>>>>> 	[...]
>>>>>> Searching the web and the outdated pnp kernel documentation, I
>>>>>> finally found an option to add to my kernel parameters line :
>>>>>> 	pnpbios=off
>>>>>> Now my floppy works again, but I am not really satisfied.
>>>>>> What do I loose with the 'pnpbios=off' option ?
>>>>>> Isn't there a smoother option to allow pnpbios but avoiding to reserve
>>>>>> floppy's io-ports ?
>>>>>> Should I modify rather /drivers/block/floppy.c or /drivers/pnp/*.c
>>>>>> to make pnpbios and floppy driver coexist peacefully ? And is there
>>>>>> an example of such modifications for other standard peripherals ?
>>>>> Presumably the problem is that your BIOS marks the IO ports used by the 
>>>>> floppy controller as reserved which prevents the floppy driver from 
>>>>> binding to them. (2.6.11 probably was before we even processed PnP 
>>>>> reserved regions.)
>>>>>
>>>>> I think we now have handling for the case where the reservations overlap 
>>>>> PCI devices, but I think it's the first I've heard of them overlapping 
>>>>> the floppy IO ports..
>>>> I should have added that, when started with pnpbios enabled, I have found 
>>>> the following in /sys/devices/pnp0/ :
>>>>
>>>> 	$ cat 00:03/id
>>>> 	PNP0700
>>>> 	$ cat 00:03/resources 	state = active
>>>> 	io 0x3f4-0x3f5
>>>> 	io 0x3f2-0x3f2
>>>> 	irq 6
>>>> 	dma 2
>>>> 	$ cat 00:03/options
>>>> 	port 0x3f4-0x3f4, align 0x0, size 0x2, 16-bit address decoding
>>>> 	port 0x3f2-0x3f2, align 0x0, size 0x1, 16-bit address decoding
>>>> 	irq 6 High-Edge
>>>> 	dma 2 8-bit compatible
>>>>
>>>> AFAIK, PNP0700 is the pnp id for the standard floppy disk,
>>>> and the resources and options files describe the expected io-ports
>>>> of the floppy disk, so this does not seem to be an error in the bios.
>>> There's likely another resource with id of PNP0C01 or PNP0C02 (Motherboard 
>>> resources) which contains that same IO port range.
>>>
>> Yes, could you post the same information for 00:07 so we can start to 
>> narrow
>> this down?  Also having "cat /proc/ioports" couldn't hurt.
> 
> Here it is, and that shows that you are thus both really experts in that area :
> 
> 	$ cat 00:07/id 00:07/resources
> 	PNP0c02
> 	state = active
> 	io 0x80-0x80
> 	io 0x10-0x1f
> 	io 0x22-0x3f
> 	io 0x44-0x5f
> 	io 0x90-0x9f
> 	io 0xa2-0xbf
> 	io 0x3f0-0x3f1
> 	io 0x3f3-0x3f3
> 	mem 0x100000-0xc0fffff
> 	mem 0xfff80000-0xfff94fff
> 	mem 0xfff98000-0xfffbffff
> 	mem 0xfffc0000-0xffffffff
> 
> 	$ cat /proc/ioports 
> 	0000-001f : dma1
> 	0020-0021 : pic1
> 	0040-0043 : timer0
> 	0050-0053 : timer1
> 	0060-006f : keyboard
> 	0070-0077 : rtc
> 	0080-008f : dma page reg
> 	00a0-00a1 : pic2
> 	00c0-00df : dma2
> 	00f0-00ff : fpu
> 	0170-0177 : 0000:00:07.1
> 	  0170-0177 : libata
> 	01f0-01f7 : 0000:00:07.1
> 	  01f0-01f7 : libata
> 	02f8-02ff : serial
> 	0376-0376 : 0000:00:07.1
> 	  0376-0376 : libata
> 	0378-037a : parport0
> 	037b-037f : parport0
> 	03c0-03df : vga+
> 	03f0-03f1 : pnp 00:07
> 	03f3-03f3 : pnp 00:07
> 	03f6-03f6 : 0000:00:07.1
> 	  03f6-03f6 : libata
> 	03f8-03ff : serial
> 	04d0-04d1 : pnp 00:11
> 	0cf8-0cff : PCI conf1
> 	ec00-ec7f : 0000:00:03.0
> 	  ec00-ec7f : tulip
> 	ecf0-ecff : 0000:00:07.1
> 	  ecf0-ecff : libata
> 
> Thanks for your quick answers.  Feel free to ask more info's

Likely we should change things so that if a motherboard resource 
overlaps another PnP resource then we ignore it, as obviously Windows 
permits this behavior..

Re: [BUG] pnpbios breaks floppy support

[Adam M Belay]

Quoting Robert Hancock <hancockrwd@gmail.com>:

> Philippe De Muyter wrote:
>> On Sun, Feb 01, 2009 at 03:48:49PM -0500, Adam M Belay wrote:
>>> Quoting Robert Hancock <hancockrwd@gmail.com>:
>>>
>>>> Philippe De Muyter wrote:
>>>>> On Sun, Feb 01, 2009 at 01:08:33AM -0600, Robert Hancock wrote:
>>>>>> Philippe De Muyter wrote:
>>>>>>> Hello linux experts,
>>>>>>> Today I tried to upgrade a PC's kernel from 2.6.11 to 2.6.22, and
>>>>>>> I saw some strange messages when booting :
>>>>>>> 	Floppy drive(s): fd0 is 1.44M
>>>>>>> 	floppy0: Floppy io-port 0x03f2 in use
>>>>>>> Previously, I had :
>>>>>>> 	Floppy drive(s): fd0 is 1.44M
>>>>>>> 	FDC 0 is a post-1991 82077
>>>>>>> Needless to say, my floppy hardware works perfectly, and my floppy
>>>>>>> was usable with the old kernel, while the floppy is now inaccessible
>>>>>>> with the new kernel.  Even /dev/fd0 does not exist anymore.
>>>>>>> Searching for a cause to that problem, I saw the following messages
>>>>>>> before the floppy probe in the new kernel :
>>>>>>> 	PnPBIOS: Scanning system for PnP BIOS support...
>>>>>>> 	PnPBIOS: Found PnP BIOS installation structure at 0xc00fd5e0
>>>>>>> 	PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0x5ba3, dseg 0xf0000
>>>>>>> 	PnPBIOS: 17 nodes reported by PnP BIOS; 17 recorded by driver
>>>>>>> 	[...]
>>>>>>> 	pnp: 00:07: ioport range 0x3f0-0x3f1 has been reserved
>>>>>>> 	pnp: 00:07: ioport range 0x3f3-0x3f3 has been reserved
>>>>>>> 	[...]
>>>>>>> Searching the web and the outdated pnp kernel documentation, I
>>>>>>> finally found an option to add to my kernel parameters line :
>>>>>>> 	pnpbios=off
>>>>>>> Now my floppy works again, but I am not really satisfied.
>>>>>>> What do I loose with the 'pnpbios=off' option ?
>>>>>>> Isn't there a smoother option to allow pnpbios but avoiding to reserve
>>>>>>> floppy's io-ports ?
>>>>>>> Should I modify rather /drivers/block/floppy.c or /drivers/pnp/*.c
>>>>>>> to make pnpbios and floppy driver coexist peacefully ? And is there
>>>>>>> an example of such modifications for other standard peripherals ?
>>>>>> Presumably the problem is that your BIOS marks the IO ports used 
>>>>>> by the floppy controller as reserved which prevents the floppy 
>>>>>> driver from binding to them. (2.6.11 probably was before we even 
>>>>>> processed PnP reserved regions.)
>>>>>>
>>>>>> I think we now have handling for the case where the reservations 
>>>>>> overlap PCI devices, but I think it's the first I've heard of 
>>>>>> them overlapping the floppy IO ports..
>>>>> I should have added that, when started with pnpbios enabled, I 
>>>>> have found the following in /sys/devices/pnp0/ :
>>>>>
>>>>> 	$ cat 00:03/id
>>>>> 	PNP0700
>>>>> 	$ cat 00:03/resources 	state = active
>>>>> 	io 0x3f4-0x3f5
>>>>> 	io 0x3f2-0x3f2
>>>>> 	irq 6
>>>>> 	dma 2
>>>>> 	$ cat 00:03/options
>>>>> 	port 0x3f4-0x3f4, align 0x0, size 0x2, 16-bit address decoding
>>>>> 	port 0x3f2-0x3f2, align 0x0, size 0x1, 16-bit address decoding
>>>>> 	irq 6 High-Edge
>>>>> 	dma 2 8-bit compatible
>>>>>
>>>>> AFAIK, PNP0700 is the pnp id for the standard floppy disk,
>>>>> and the resources and options files describe the expected io-ports
>>>>> of the floppy disk, so this does not seem to be an error in the bios.
>>>> There's likely another resource with id of PNP0C01 or PNP0C02 
>>>> (Motherboard resources) which contains that same IO port range.
>>>>
>>> Yes, could you post the same information for 00:07 so we can start 
>>> to narrow
>>> this down?  Also having "cat /proc/ioports" couldn't hurt.
>>
>> Here it is, and that shows that you are thus both really experts in 
>> that area :
>>
>> 	$ cat 00:07/id 00:07/resources
>> 	PNP0c02
>> 	state = active
>> 	io 0x80-0x80
>> 	io 0x10-0x1f
>> 	io 0x22-0x3f
>> 	io 0x44-0x5f
>> 	io 0x90-0x9f
>> 	io 0xa2-0xbf
>> 	io 0x3f0-0x3f1
>> 	io 0x3f3-0x3f3
>> 	mem 0x100000-0xc0fffff
>> 	mem 0xfff80000-0xfff94fff
>> 	mem 0xfff98000-0xfffbffff
>> 	mem 0xfffc0000-0xffffffff
>>
>> 	$ cat /proc/ioports 	0000-001f : dma1
>> 	0020-0021 : pic1
>> 	0040-0043 : timer0
>> 	0050-0053 : timer1
>> 	0060-006f : keyboard
>> 	0070-0077 : rtc
>> 	0080-008f : dma page reg
>> 	00a0-00a1 : pic2
>> 	00c0-00df : dma2
>> 	00f0-00ff : fpu
>> 	0170-0177 : 0000:00:07.1
>> 	  0170-0177 : libata
>> 	01f0-01f7 : 0000:00:07.1
>> 	  01f0-01f7 : libata
>> 	02f8-02ff : serial
>> 	0376-0376 : 0000:00:07.1
>> 	  0376-0376 : libata
>> 	0378-037a : parport0
>> 	037b-037f : parport0
>> 	03c0-03df : vga+
>> 	03f0-03f1 : pnp 00:07
>> 	03f3-03f3 : pnp 00:07
>> 	03f6-03f6 : 0000:00:07.1
>> 	  03f6-03f6 : libata
>> 	03f8-03ff : serial
>> 	04d0-04d1 : pnp 00:11
>> 	0cf8-0cff : PCI conf1
>> 	ec00-ec7f : 0000:00:03.0
>> 	  ec00-ec7f : tulip
>> 	ecf0-ecff : 0000:00:07.1
>> 	  ecf0-ecff : libata
>>
>> Thanks for your quick answers.  Feel free to ask more info's
>
> Likely we should change things so that if a motherboard resource 
> overlaps another PnP resource then we ignore it, as obviously Windows 
> permits this behavior..
>

Ok, so it appears that we have a genuine resource conflict with the
system device (00:07).  This is because the floppy driver is requesting
four consecutive I/O ports rather than the two ports reported by the
PnPBIOS.

Here's a look at what I see on one of my ACPI boxes:

state = active
io 0x3f0-0x3f5
io 0x3f7-0x3f7
irq 6
dma 2

This should work just fine and matches well with what the floppy driver
expects.

So the next step is to determine if this issue is typical when running in
PnPBIOS mode.  I'm not convinced we need to permit PnP resources to overlap,
as it turns out to not be the issue in this case: There are no overlaps
between the system device and floppy device in Philippe's configuration.
It does suggest, however, that calling request_region() without using the
size of the resource that PnP reports can cause problems.

Bjorn, I think it might make sense to eventually have the PnP layer
register resources with request_region() instead of handling it in
device drivers.  What do you think?  In the short term we could either
skip the floppy driver's call to request_region() when using PnP detection
or have it use the length reported in the resource descriptor.  Still, I'm
curious which I/O ports the driver is actually using.

More to follow...

Thanks,
Adam

Re: [BUG] pnpbios breaks floppy support

[Bjorn Helgaas]

On Sunday 01 February 2009 11:43:31 pm Adam M Belay wrote:
> >>>>> 	$ cat 00:03/resources
> >>>>> 	state = active 
> >>>>> 	io 0x3f4-0x3f5
> >>>>> 	io 0x3f2-0x3f2

> >> 	$ cat 00:07/id 00:07/resources
> >> 	PNP0c02
> >> 	state = active
> >> 	io 0x80-0x80
> >> 	io 0x10-0x1f
> >> 	io 0x22-0x3f
> >> 	io 0x44-0x5f
> >> 	io 0x90-0x9f
> >> 	io 0xa2-0xbf
> >> 	io 0x3f0-0x3f1
> >> 	io 0x3f3-0x3f3

> Ok, so it appears that we have a genuine resource conflict with the
> system device (00:07).  This is because the floppy driver is requesting
> four consecutive I/O ports rather than the two ports reported by the
> PnPBIOS.

As far as I can tell, floppy.c uses only these registers:
  0x3f2 (FD_DOR)
  0x3f4 (FD_STATUS)
  0x3f5 (FD_DATA)
  0x3f7 (FD_DCR/FD_DIR)

But it requests 0x3f2-0x3f5 and 0x3f7.  That includes the unused
register at 0x3f3, hence the conflict with 00:07.

I think we should just change floppy.c to request only ports
2, 4-5, and 7, with something like the patch below.  Philippe,
can you give it a try?

> Bjorn, I think it might make sense to eventually have the PnP layer
> register resources with request_region() instead of handling it in
> device drivers.  What do you think?  In the short term we could either
> skip the floppy driver's call to request_region() when using PnP detection
> or have it use the length reported in the resource descriptor.  Still, I'm
> curious which I/O ports the driver is actually using.

In PCI, we do both: the core requests resources based on the BAR values,
and the drivers request the actual resources they need.  I think that's
important because we account for the resources used by devices without
drivers.

I would really like the PNP core to do something similar eventually.
We actually tried it a year or so ago in the -mm tree, but there are
some subtleties that I didn't fully comprehend, so we had to back it
out.  Here are some of the threads from that attempt:

  http://lkml.org/lkml/2007/10/29/412 (RFC)
  http://lkml.org/lkml/2007/11/1/214 (repost)
  http://lkml.org/lkml/2007/11/29/451 (suspend/resume problem)
  http://lkml.org/lkml/2007/12/5/227 (more suspend/resume fiddling)
  http://lkml.org/lkml/2007/12/11/200 (causes critical temp shutdown)

Bjorn


diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index cf29cc4..44f711b 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -4399,15 +4399,20 @@ static int floppy_grab_irq_and_dma(void)
 
 	for (fdc = 0; fdc < N_FDC; fdc++) {
 		if (FDCS->address != -1) {
-			if (!request_region(FDCS->address + 2, 4, "floppy")) {
+			if (!request_region(FDCS->address + 2, 1, "floppy")) {
 				DPRINT("Floppy io-port 0x%04lx in use\n",
 				       FDCS->address + 2);
 				goto cleanup1;
 			}
+			if (!request_region(FDCS->address + 4, 2, "floppy")) {
+				DPRINT("Floppy io-port 0x%04lx in use\n",
+				       FDCS->address + 4);
+				goto cleanup2;
+			}
 			if (!request_region(FDCS->address + 7, 1, "floppy DIR")) {
 				DPRINT("Floppy io-port 0x%04lx in use\n",
 				       FDCS->address + 7);
-				goto cleanup2;
+				goto cleanup3;
 			}
 			/* address + 6 is reserved, and may be taken by IDE.
 			 * Unfortunately, Adaptec doesn't know this :-(, */
@@ -4432,13 +4437,16 @@ static int floppy_grab_irq_and_dma(void)
 	fdc = 0;
 	irqdma_allocated = 1;
 	return 0;
+cleanup3:
+	release_region(FDCS->address + 4, 2);
 cleanup2:
-	release_region(FDCS->address + 2, 4);
+	release_region(FDCS->address + 2, 1);
 cleanup1:
 	fd_free_irq();
 	fd_free_dma();
 	while (--fdc >= 0) {
-		release_region(FDCS->address + 2, 4);
+		release_region(FDCS->address + 2, 1);
+		release_region(FDCS->address + 4, 2);
 		release_region(FDCS->address + 7, 1);
 	}
 	spin_lock_irqsave(&floppy_usage_lock, flags);

Re: [BUG] pnpbios breaks floppy support

[Philippe De Muyter]

On Tue, Feb 03, 2009 at 05:29:01PM -0700, Bjorn Helgaas wrote:

> I think we should just change floppy.c to request only ports
> 2, 4-5, and 7, with something like the patch below.  Philippe,
> can you give it a try?

Your patch solves the problem : no error from the floppy initialisation,
and the floppy works effectively.

Thank you

Philippe

Re: [BUG] pnpbios breaks floppy support

[Adam M Belay]

Philippe, thanks for reporting this bug and testing the fix.  Bjorn,
this patch looks good to me.

Thanks,
Adam

Quoting Philippe De Muyter <phdm@macqel.be>:

> On Tue, Feb 03, 2009 at 05:29:01PM -0700, Bjorn Helgaas wrote:
>
>> I think we should just change floppy.c to request only ports
>> 2, 4-5, and 7, with something like the patch below.  Philippe,
>> can you give it a try?
>
> Your patch solves the problem : no error from the floppy initialisation,
> and the floppy works effectively.
>
> Thank you
>
> Philippe
>

Re: [BUG] pnpbios breaks floppy support

[matthieu castet]

> I should have added that, when started with pnpbios enabled, 
> I have found the following in /sys/devices/pnp0/ :
> 
> 	$ cat 00:03/id
> 	PNP0700
> 	$ cat 00:03/resources 
> 	state = active
> 	io 0x3f4-0x3f5
> 	io 0x3f2-0x3f2
> 	irq 6
> 	dma 2
> 	$ cat 00:03/options
> 	port 0x3f4-0x3f4, align 0x0, size 0x2, 16-bit address decoding
> 	port 0x3f2-0x3f2, align 0x0, size 0x1, 16-bit address decoding
> 	irq 6 High-Edge
> 	dma 2 8-bit compatible

And what is on "cat 00:07/resources" ?
I bet you also found the floppy IO here...


Matthieu