[Intel-gfx] New " Unclaimed read from register 0x1f0034" in 4.12-rc1

[Chris Wilson]

On Thu, May 18, 2017 at 02:20:09PM +0200, Hans de Goede wrote:
> Hi,
> 
> So while trying to reproduce my previously reported
> "RPM wakelock ref not held during HW access" in 4.12-rc1 ?"
> 
> Bug, to test the possible fixes I encountered a new
> "RPM wakelock ref not held during HW access" error combined
> with a "Unclaimed read from register 0x1f0034" error:
> 
> Which I believe is a new issue in 4.12-rc1 I've tried adding
> i915.mmio_debug=99 to the kernel cmdline and then I get the
> same unclaimed read error 3 times for a single resume.
> 
> [   69.462566] Suspended for 3.099 seconds
> [   69.463092] PM: resume from suspend-to-idle
> [   69.489870] PM: noirq resume of devices complete after 26.368 msecs
> [   69.490177] RPM wakelock ref not held during HW access
> [   69.490355] ------------[ cut here ]------------
> [   69.490441] WARNING: CPU: 1 PID: 2003 at drivers/gpu/drm/i915/intel_drv.h:1780 intel_init_vebox_ring_buffer+0x3753/0x4cb0 [i915]
> ...
> [   69.491022] RIP: 0010:intel_init_vebox_ring_buffer+0x3753/0x4cb0 [i915]
> ...
> [   69.491089] Call Trace:
> [   69.491152]  intel_gvt_init_cmd_parser+0x25a/0x360 [i915]

Your symbols are wrong, that's the only explanation I can give for the
incorrect function chains. Can you track down what's causing the stack
trace to be so confused?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre