* PCI config space
@ 2004-01-02 21:55 Jon Smirl
2004-01-03 0:50 ` Greg KH
` (4 more replies)
0 siblings, 5 replies; 9+ messages in thread
From: Jon Smirl @ 2004-01-02 21:55 UTC (permalink / raw)
To: linux-hotplug
Is there a standard API for read/write of PCI config space using sysfs?
==Jon Smirl
jonsmirl@yahoo.com
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^ permalink raw reply [flat|nested] 9+ messages in thread* Re: PCI config space
2004-01-02 21:55 PCI config space Jon Smirl
@ 2004-01-03 0:50 ` Greg KH
2004-01-03 1:03 ` Jon Smirl
` (3 subsequent siblings)
4 siblings, 0 replies; 9+ messages in thread
From: Greg KH @ 2004-01-03 0:50 UTC (permalink / raw)
To: linux-hotplug
On Fri, Jan 02, 2004 at 01:55:57PM -0800, Jon Smirl wrote:
> Is there a standard API for read/write of PCI config space using sysfs?
Open the "config" file and read and write the offset that you want to
read/write.
Does that not work for you?
greg k-h
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^ permalink raw reply [flat|nested] 9+ messages in thread* Re: PCI config space
2004-01-02 21:55 PCI config space Jon Smirl
2004-01-03 0:50 ` Greg KH
@ 2004-01-03 1:03 ` Jon Smirl
2004-01-03 1:22 ` Greg KH
` (2 subsequent siblings)
4 siblings, 0 replies; 9+ messages in thread
From: Jon Smirl @ 2004-01-03 1:03 UTC (permalink / raw)
To: linux-hotplug
That's real simple. I was trying to find a more complicated, harder solution. I
need the PCI space for the VM86 emulation of the VBIOS calls.
Is libsysfs going to be part of klibc? I can link it in statically for now.
And I should use something like execl (seems to be in klibc) to call udev to
query for it's directory and my path?
--- Greg KH <greg@kroah.com> wrote:
> On Fri, Jan 02, 2004 at 01:55:57PM -0800, Jon Smirl wrote:
> > Is there a standard API for read/write of PCI config space using sysfs?
>
> Open the "config" file and read and write the offset that you want to
> read/write.
>
> Does that not work for you?
>
> greg k-h
==Jon Smirl
jonsmirl@yahoo.com
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^ permalink raw reply [flat|nested] 9+ messages in thread* Re: PCI config space
2004-01-02 21:55 PCI config space Jon Smirl
2004-01-03 0:50 ` Greg KH
2004-01-03 1:03 ` Jon Smirl
@ 2004-01-03 1:22 ` Greg KH
2004-01-03 1:57 ` Jon Smirl
2004-01-03 2:21 ` Greg KH
4 siblings, 0 replies; 9+ messages in thread
From: Greg KH @ 2004-01-03 1:22 UTC (permalink / raw)
To: linux-hotplug
On Fri, Jan 02, 2004 at 05:03:20PM -0800, Jon Smirl wrote:
> That's real simple. I was trying to find a more complicated, harder solution. I
> need the PCI space for the VM86 emulation of the VBIOS calls.
>
> Is libsysfs going to be part of klibc? I can link it in statically for now.
They are two different, separate things, and will stay that way.
> And I should use something like execl (seems to be in klibc) to call udev to
> query for it's directory and my path?
"my path"? What does that mean?
thanks,
greg k-h
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: PCI config space
2004-01-02 21:55 PCI config space Jon Smirl
` (2 preceding siblings ...)
2004-01-03 1:22 ` Greg KH
@ 2004-01-03 1:57 ` Jon Smirl
2004-01-03 2:21 ` Greg KH
4 siblings, 0 replies; 9+ messages in thread
From: Jon Smirl @ 2004-01-03 1:57 UTC (permalink / raw)
To: linux-hotplug
--- Greg KH <greg@kroah.com> wrote:
> On Fri, Jan 02, 2004 at 05:03:20PM -0800, Jon Smirl wrote:
> > And I should use something like execl (seems to be in klibc) to call udev to
> > query for it's directory and my path?
>
> "my path"? What does that mean?
My DEVPATH, /class/dri/card0 so that I can do:
udev -q /class/dri/card0
and get the path to my device:
dri/card0
and combine it with:
udev -r
which returns
/udev/
So that I can build the path to my device:
/udev/dri/card0
==Jon Smirl
jonsmirl@yahoo.com
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^ permalink raw reply [flat|nested] 9+ messages in thread* Re: PCI config space
2004-01-02 21:55 PCI config space Jon Smirl
` (3 preceding siblings ...)
2004-01-03 1:57 ` Jon Smirl
@ 2004-01-03 2:21 ` Greg KH
4 siblings, 0 replies; 9+ messages in thread
From: Greg KH @ 2004-01-03 2:21 UTC (permalink / raw)
To: linux-hotplug
On Fri, Jan 02, 2004 at 05:57:02PM -0800, Jon Smirl wrote:
> --- Greg KH <greg@kroah.com> wrote:
> > On Fri, Jan 02, 2004 at 05:03:20PM -0800, Jon Smirl wrote:
> > > And I should use something like execl (seems to be in klibc) to call udev to
> > > query for it's directory and my path?
> >
> > "my path"? What does that mean?
>
> My DEVPATH, /class/dri/card0 so that I can do:
> udev -q /class/dri/card0
> and get the path to my device:
> dri/card0
That is your device node that udev created, right?
> and combine it with:
> udev -r
> which returns
> /udev/
>
> So that I can build the path to my device:
> /udev/dri/card0
Yes, then you can do whatever operations on that device node you want
to.
But if you want to touch the PCI config stuff for your device, just go
off of the DEVPATH. There should be a "device" symlink in your
/class/dri/card0/ directory that points to the pci device directory,
right?
Anyway, it sounds like you are on the right path...
thanks,
greg k-h
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^ permalink raw reply [flat|nested] 9+ messages in thread
* pci config space
@ 2011-02-19 21:32 Asim
2011-02-20 5:33 ` Greg KH
0 siblings, 1 reply; 9+ messages in thread
From: Asim @ 2011-02-19 21:32 UTC (permalink / raw)
To: kernelnewbies
Hi,
While this may just be connecting the dots, I am not able to fully
understand how pci_save_state works.
I see that the pci_save_state and pci_restore_state are invoked at
suspend and resume. This saves the PCI configuration registers during
suspend. Are these the device registers or bridge registers?
Consequently, is the pci_save_state and driver suspend routine saving
the full device state/device state exposed to PCI or PCI state ?
Thanks,
Asim
^ permalink raw reply [flat|nested] 9+ messages in thread
* pci config space
2011-02-19 21:32 pci " Asim
@ 2011-02-20 5:33 ` Greg KH
2011-02-20 20:27 ` Asim
0 siblings, 1 reply; 9+ messages in thread
From: Greg KH @ 2011-02-20 5:33 UTC (permalink / raw)
To: kernelnewbies
On Sat, Feb 19, 2011 at 03:32:51PM -0600, Asim wrote:
> Hi,
>
> While this may just be connecting the dots, I am not able to fully
> understand how pci_save_state works.
>
> I see that the pci_save_state and pci_restore_state are invoked at
> suspend and resume. This saves the PCI configuration registers during
> suspend. Are these the device registers or bridge registers?
It depends if the device is a device or a bridge :)
> Consequently, is the pci_save_state and driver suspend routine saving
> the full device state/device state exposed to PCI or PCI state ?
Yes.
Hope this helps,
greg k-h
^ permalink raw reply [flat|nested] 9+ messages in thread
* pci config space
2011-02-20 5:33 ` Greg KH
@ 2011-02-20 20:27 ` Asim
0 siblings, 0 replies; 9+ messages in thread
From: Asim @ 2011-02-20 20:27 UTC (permalink / raw)
To: kernelnewbies
Thanks for your response.
On Sat, Feb 19, 2011 at 11:33 PM, Greg KH <greg@kroah.com> wrote:
> On Sat, Feb 19, 2011 at 03:32:51PM -0600, Asim wrote:
>> Hi,
>>
>> While this may just be connecting the dots, I am not able to fully
>> understand how pci_save_state works.
>>
>> I see that the pci_save_state and pci_restore_state are invoked at
>> suspend and resume. ?This saves the PCI configuration registers during
>> suspend. Are these the device registers or bridge registers?
>
> It depends if the device is a device or a bridge :)
>
>> Consequently, is the pci_save_state and driver suspend routine saving
>> the full device state/device state exposed to PCI or PCI state ?
>
> Yes.
>
> Hope this helps,
>
> greg k-h
>
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2011-02-20 20:27 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2004-01-02 21:55 PCI config space Jon Smirl
2004-01-03 0:50 ` Greg KH
2004-01-03 1:03 ` Jon Smirl
2004-01-03 1:22 ` Greg KH
2004-01-03 1:57 ` Jon Smirl
2004-01-03 2:21 ` Greg KH
-- strict thread matches above, loose matches on Subject: below --
2011-02-19 21:32 pci " Asim
2011-02-20 5:33 ` Greg KH
2011-02-20 20:27 ` Asim
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