Trace MMIO Read/Write

[Joseph Smith]

Hello,
Is there anyway to trace (capture) reads and writes to a mmio space in
Linux? A utility program maybe?

[ron minnich]

On Wed, Mar 4, 2009 at 2:23 PM, Joseph Smith  wrote:
> Hello,
> Is there anyway to trace (capture) reads and writes to a mmio space in
> Linux? A utility program maybe?

tell me more. what is the program, can you run it under ptrace, etc.
What's it do?

ron

[Joseph Smith]

On Wed, 4 Mar 2009 14:25:03 -0800, ron minnich  wrote:
> On Wed, Mar 4, 2009 at 2:23 PM, Joseph Smith  wrote:
> > Hello,
> > Is there anyway to trace (capture) reads and writes to a mmio space in
> > Linux? A utility program maybe?
>
> tell me more. what is the program, can you run it under ptrace, etc.
> What's it do?

I more specifically, I can dump the mmio space before and after a driver is
implimented, but there are certian registers that get programmed in a
specific order to give the end result. I need to know what registers get
programmed in what order, does that make sense?

[Patrick Georgi]

Am 04.03.2009 23:23, schrieb Joseph Smith:
> Hello,
> Is there anyway to trace (capture) reads and writes to a mmio space in
> Linux? A utility program maybe?

I think that's what the renouveau project does, so they should have a
tool for that.
It should work by mapping the mmio area away, then catching all accesses
before passing them trough.

Regards,
Patrick Georgi

[Joseph Smith]

On Wed, 04 Mar 2009 23:27:07 +0100, Patrick Georgi 
wrote:
> Am 04.03.2009 23:23, schrieb Joseph Smith:
> > Hello,
> > Is there anyway to trace (capture) reads and writes to a mmio space in
> > Linux? A utility program maybe?
>
> I think that's what the renouveau project does, so they should have a
> tool for that.
> It should work by mapping the mmio area away, then catching all accesses
> before passing them trough.

Thanks Patrick, I will check it out. Does it catch reads as well as writes?

[Joseph Smith]

On Wed, 04 Mar 2009 17:37:50 -0500, Joseph Smith 
wrote:
> On Wed, 04 Mar 2009 23:27:07 +0100, Patrick Georgi
>
> wrote:
> > Am 04.03.2009 23:23, schrieb Joseph Smith:
> > > Hello,
> > > Is there anyway to trace (capture) reads and writes to a mmio space in
> > > Linux? A utility program maybe?
> >
> > I think that's what the renouveau project does, so they should have a
> > tool for that.
> > It should work by mapping the mmio area away, then catching all accesses
> > before passing them trough.
>
> Thanks Patrick, I will check it out. Does it catch reads as well as
> writes?

Ahhh, thanks again Patrick!

http://nouveau.freedesktop.org/wiki/MmioTrace

This will do exactly what I want it to :-)
Yahoo, this is going to crack the mystery wide open!!!

[Joseph Smith]

On Wed, 04 Mar 2009 17:48:55 -0500, Joseph Smith 
wrote:
> On Wed, 04 Mar 2009 17:37:50 -0500, Joseph Smith 
> wrote:
> > On Wed, 04 Mar 2009 23:27:07 +0100, Patrick Georgi
> >
> > wrote:
> > > Am 04.03.2009 23:23, schrieb Joseph Smith:
> > > > Hello,
> > > > Is there anyway to trace (capture) reads and writes to a mmio space in
> > > > Linux? A utility program maybe?
> > >
> > > I think that's what the renouveau project does, so they should have a
> > > tool for that.
> > > It should work by mapping the mmio area away, then catching all
>
> accesses
> > > before passing them trough.
> >
> > Thanks Patrick, I will check it out. Does it catch reads as well as
> > writes?
>
> Ahhh, thanks again Patrick!
>
> http://nouveau.freedesktop.org/wiki/MmioTrace

hmmm :-(
I need to do this on a older kernel 2.6.10 and mmiotrace does not support
older kernels....

Any other suggestions?

[Myles Watson]

> -----Original Message-----
> From: coreboot-bounces+mylesgw=[e-mail] [mailto:coreboot-
> bounces+mylesgw=[e-mail]] On Behalf Of Joseph Smith
> Sent: Wednesday, March 04, 2009 6:13 PM
> To: Patrick Georgi; coreboot
> Subject: Re: [coreboot] Trace MMIO Read/Write
>
> On Wed, 04 Mar 2009 17:48:55 -0500, Joseph Smith 
> wrote:
> > On Wed, 04 Mar 2009 17:37:50 -0500, Joseph Smith 
> > wrote:
> > > On Wed, 04 Mar 2009 23:27:07 +0100, Patrick Georgi
> > >
> > > wrote:
> > > > Am 04.03.2009 23:23, schrieb Joseph Smith:
> > > > > Hello,
> > > > > Is there anyway to trace (capture) reads and writes to a mmio space
>
> in
> > > > > Linux? A utility program maybe?
> > > >
> > > > I think that's what the renouveau project does, so they should have a
> > > > tool for that.
> > > > It should work by mapping the mmio area away, then catching all
> >
> > accesses
> > > > before passing them trough.
> > >
> > > Thanks Patrick, I will check it out. Does it catch reads as well as
> > > writes?
> >
> > Ahhh, thanks again Patrick!
> >
> > http://nouveau.freedesktop.org/wiki/MmioTrace
>
> hmmm :-(
> I need to do this on a older kernel 2.6.10 and mmiotrace does not support
> older kernels....
>
> Any other suggestions?

Does it run in a simulator or an emulator?  SimNow or Qemu could log them
for you.

Myles

[Joseph Smith]

On Wed, 4 Mar 2009 20:44:38 -0700, "Myles Watson" 
wrote:
> > -----Original Message-----
> > From: coreboot-bounces+mylesgw=[e-mail] [mailto:coreboot-
> > bounces+mylesgw=[e-mail]] On Behalf Of Joseph Smith
> > Sent: Wednesday, March 04, 2009 6:13 PM
> > To: Patrick Georgi; coreboot
> > Subject: Re: [coreboot] Trace MMIO Read/Write
> >
> > On Wed, 04 Mar 2009 17:48:55 -0500, Joseph Smith 
> > wrote:
> > > On Wed, 04 Mar 2009 17:37:50 -0500, Joseph Smith 
> > > wrote:
> > > > On Wed, 04 Mar 2009 23:27:07 +0100, Patrick Georgi
> > > >
> > > > wrote:
> > > > > Am 04.03.2009 23:23, schrieb Joseph Smith:
> > > > > > Hello,
> > > > > > Is there anyway to trace (capture) reads and writes to a mmio space
> >
> > in
> > > > > > Linux? A utility program maybe?
> > > > >
> > > > > I think that's what the renouveau project does, so they should have
>
> a
> > > > > tool for that.
> > > > > It should work by mapping the mmio area away, then catching all
> > >
> > > accesses
> > > > > before passing them trough.
> > > >
> > > > Thanks Patrick, I will check it out. Does it catch reads as well as
> > > > writes?
> > >
> > > Ahhh, thanks again Patrick!
> > >
> > > http://nouveau.freedesktop.org/wiki/MmioTrace
> >
> > hmmm :-(
> > I need to do this on a older kernel 2.6.10 and mmiotrace does not
>
> support
> > older kernels....
> >
> > Any other suggestions?
>
> Does it run in a simulator or an emulator?  SimNow or Qemu could log them
> for you.

Can they simulate a Intel onboard graphics adapter?

[Myles Watson]

> -----Original Message-----
> From: Joseph Smith [mailto:[e-mail]]
> Sent: Wednesday, March 04, 2009 9:14 PM
> To: Myles Watson
> Cc: coreboot
> Subject: RE: [coreboot] Trace MMIO Read/Write
>
> On Wed, 4 Mar 2009 20:44:38 -0700, "Myles Watson" 
> wrote:
> > > -----Original Message-----
> > > From: coreboot-bounces+mylesgw=[e-mail] [mailto:coreboot-
> > > bounces+mylesgw=[e-mail]] On Behalf Of Joseph Smith
> > > Sent: Wednesday, March 04, 2009 6:13 PM
> > > To: Patrick Georgi; coreboot
> > > Subject: Re: [coreboot] Trace MMIO Read/Write
> > >
> > > On Wed, 04 Mar 2009 17:48:55 -0500, Joseph Smith 
> > > wrote:
> > > > On Wed, 04 Mar 2009 17:37:50 -0500, Joseph Smith
>
> > > > wrote:
> > > > > On Wed, 04 Mar 2009 23:27:07 +0100, Patrick Georgi
> > > > >
> > > > > wrote:
> > > > > > Am 04.03.2009 23:23, schrieb Joseph Smith:
> > > > > > > Hello,
> > > > > > > Is there anyway to trace (capture) reads and writes to a mmio
>
> space
> > > in
> > > > > > > Linux? A utility program maybe?
> > > > > > >
> > > > > > I think that's what the renouveau project does, so they should have
> >
> > a
> > > > > > tool for that.
> > > > > > It should work by mapping the mmio area away, then catching all
> > > >
> > > > accesses
> > > > > > before passing them trough.
> > > > >
> > > > > Thanks Patrick, I will check it out. Does it catch reads as well as
> > > > > writes?
> > > >
> > > > Ahhh, thanks again Patrick!
> > > >
> > > > http://nouveau.freedesktop.org/wiki/MmioTrace
> > >
> > > hmmm :-(
> > > I need to do this on a older kernel 2.6.10 and mmiotrace does not
> >
> > support
> > > older kernels....
> > >
> > > Any other suggestions?
> >
> > Does it run in a simulator or an emulator?  SimNow or Qemu could log
>
> them
> > for you.
>
> Can they simulate a Intel onboard graphics adapter?

Probably not easily.  Is the driver not open-source?  I'm wondering why you
couldn't recompile it for the newer kernel if you really want to use
MmioTrace.

Thanks,
Myles

[Joseph Smith]

> > > > I need to do this on a older kernel 2.6.10 and mmiotrace does not
> > >
> > > support
> > > > older kernels....
> > > >
> > > > Any other suggestions?
> > >
> > > Does it run in a simulator or an emulator?  SimNow or Qemu could log
> >
> > them
> > > for you.
> >
> > Can they simulate a Intel onboard graphics adapter?
>
> Probably not easily.  Is the driver not open-source?  I'm wondering why
> you
> couldn't recompile it for the newer kernel if you really want to use
> MmioTrace.

That is were the problem lies. It is a prebuilt kernel module (*.ko) for
2.6.10... The source is not available. That is why I need to do a mmio
trace to find out exactly what it is doing. If I had the source I would not
need the trace. I wonder if I could backwards hack MmioTrace to work with
the 2.6.10 kernel?