Re: [Xen-devel] Radeon DRM dom0 issues

[Michael D Labriola <mlabriol@xxxxxxxx>]

Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote on 01/24/2014 
09:49:38 AM:

> From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> To: Michael D Labriola <mlabriol@xxxxxxxx>, 
> Cc: Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>, 
> michael.d.labriola@xxxxxxxxx, xen-devel@xxxxxxxxxxxxx, xen-devel-
> bounces@xxxxxxxxxxxxx
> Date: 01/24/2014 09:50 AM
> Subject: Re: [Xen-devel] Radeon DRM dom0 issues
> 
> On Thu, Jan 23, 2014 at 11:54:37AM -0500, Michael D Labriola wrote:
> > xen-devel-bounces@xxxxxxxxxxxxx wrote on 01/21/2014 04:59:05 PM:
> > 
> > > From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> > > To: Michael D Labriola <mlabriol@xxxxxxxx>, 
> > > Cc: Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>, 
> > > michael.d.labriola@xxxxxxxxx, xen-devel@xxxxxxxxxxxxx
> > > Date: 01/21/2014 04:59 PM
> > > Subject: Re: [Xen-devel] Radeon DRM dom0 issues
> > > Sent by: xen-devel-bounces@xxxxxxxxxxxxx
> > > 
> > > On Mon, Jan 20, 2014 at 03:15:24PM -0500, Michael D Labriola wrote:
> > > > Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote on 01/20/2014 

> > > > 10:38:27 AM:
> > > > 
> > > > > From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> > > > > To: Michael D Labriola <mlabriol@xxxxxxxx>, 
> > > > > Cc: Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>, 
> > > > > michael.d.labriola@xxxxxxxxx, xen-devel@xxxxxxxxxxxxx
> > > > > Date: 01/20/2014 10:38 AM
> > > > > Subject: Re: [Xen-devel] Radeon DRM dom0 issues
> > > > > 
> > > > > On Mon, Jan 20, 2014 at 10:26:22AM -0500, Michael D Labriola 
wrote:
> > > > > > Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx> wrote on 01/20/2014 
> > 10:14:36 
> > > > AM:
> > > > > > 
> > > > > > > From: Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>
> > > > > > > To: Michael D Labriola <mlabriol@xxxxxxxx>, 
> > > > > > > Cc: xen-devel@xxxxxxxxxxxxx, michael.d.labriola@xxxxxxxxx
> > > > > > > Date: 01/20/2014 10:14 AM
> > > > > > > Subject: Re: [Xen-devel] Radeon DRM dom0 issues
> > > > > > > 
> > > > > > > On Mon, Jan 20, 2014 at 09:58:32AM -0500, Michael D Labriola 

> > wrote:
> > > > > > > > Anyone here running a dom0 w/ Radeon DRM?  I'm having 
> > consistent 
> > > > > > crashes 
> > > > > > > > with multiple older R600 series (HD 6470 and HD 6570) and 
> > unusably 
> > > > 
> > > > > > slow 
> > > > > > > > graphics with a newer HD7000 (can see each line refresh 
> > > > indiviually on 
> > > > > > 
> > > > > > > > radeonfb tty).  All 3 systems seem to work fine bare 
metal.
> > > > > > > 
> > > > > > > I hadn't been using DRM, just Xserver. Is that what you 
mean?
> > > > > > 
> > > > > > The R600 problems happen when in X, using OpenGL, on my dom0. 
The 
> > 
> > > > > > RadeonSI sluggishness is when using the KMS framebuffer device 
for 
> > a 
> > > > plain 
> > > > > > text console login.
> > > > > 
> > > > > So sluggish is probably due to the PAT not being enabled. This 
patch
> > > > > should be applied:
> > > > > 
> > > > > lkml.org/lkml/2011/11/8/406
> > > > > 
> > > > > (or http://marc.info/?l=linux-kernel&m=132888833209874&w=2)
> > > > > 
> > > > > and these two reverted:
> > > > > 
> > > > >  "xen/pat: Disable PAT support for now."
> > > > >  "xen/pat: Disable PAT using pat_enabled value."
> > > > > 
> > > > > Which is to say do:
> > > > > 
> > > > > git revert c79c49826270b8b0061b2fca840fc3f013c8a78a
> > > > > git revert 8eaffa67b43e99ae581622c5133e20b0f48bcef1
> > > > 
> > > > Thanks!  I cherry-picked that patch out of your testing tree, 
reverted 
> > 
> > > > those 2 commits, recompiled and installed.  Definitely fixed the 
HD 
> > 7000 
> > > > sluggishness and appears to have fixed the R600 crashes (although 
it's 
> > 
> > > > only been running a few hours).
> > > > 
> > > > How come that patch didn't get into mainline?  It looks pretty 
> > innocuous 
> > > > to me...
> > > 
> > > <Sigh> the x86 maintainers wanted a different route. And I hadn't 
had
> > > the chance nor time to implement it.
> > 
> > I see.  Well, I've got a handful of boxes in my lab that need that 
patch 
> > to be usable.  If you do come up with a more mainline-able solution, 
I'd 
> > gladly test it for you.  ;-)
> 
> Thank you!

Uh, oh.  Looks like those reverts and patches didn't entirely fix my 
problem.  My box with the HD5450 (r600 gallium3d) started going bonkers 
again yeserday.  After being solid as a rock for 2 weeks as my primary 
workstation, X has crashed a half dozen or so times so far this week. I've 
been in Xen with 2 paravirtual linux guests running almost constantly for 
this whole period.  I don't understand what's changed, but my system has 
been entirely unstable now.  I did recompile my kernel... but I all did 
was merge the v3.13.1 stable commit into my working tree and turn a few 
things on (netfilter, wifi, a couple drivers turned on here and there).  I 
just went and verified that those patches are still applied in my tree 
(i.e., I didn't accidentally undo them).  I'm scratching my head (and 
staring at a TTY login).

When X crashes, my kernel log prints a couple dozen iterations of this. 3d 
acceleration no longer functions unless I reboot.  If memory serves, the 
unpatched behavior upon X crash was that the kernel continued to spew 
these errors until the whole box locked up.  At least that's not happening 
any more... ;-)

[  702.070084] [TTM] radeon 0000:01:00.0: Unable to get page 2
[  702.075971] [TTM] radeon 0000:01:00.0: Failed to fill cached pool 
(r:-12)!
[  704.720699] [TTM] radeon 0000:01:00.0: Unable to get page 0
[  704.726635] [TTM] radeon 0000:01:00.0: Failed to fill cached pool 
(r:-12)!
[  704.733910] [drm:radeon_gem_object_create] *ERROR* Failed to allocate 
GEM object (8192, 2, 4096, -12)

and here's a slightly different variant that happened while I was typing 
this email (on a different machine, luckily):

[ 3107.713039] sdf: detected capacity change from 31625052160 to 0
[ 3114.491717] usb 9-1: USB disconnect, device number 2
[64348.271534] [TTM] radeon 0000:01:00.0: Unable to get page 3
[64348.277312] [TTM] radeon 0000:01:00.0: Failed to fill cached pool 
(r:-12)!
[64348.284470] [TTM] radeon 0000:01:00.0: Unable to get page 0
[64348.290257] [TTM] radeon 0000:01:00.0: Failed to fill cached pool 
(r:-12)!
[64348.297561] [TTM] Buffer eviction failed
[64349.550518] [TTM] radeon 0000:01:00.0: Unable to get page 0
[64349.556417] [TTM] radeon 0000:01:00.0: Failed to fill cached pool 
(r:-12)!
[64349.563714] [drm:radeon_gem_object_create] *ERROR* Failed to allocate 
GEM object (16384, 2, 4096, -12)

Any ideas?


---
Michael D Labriola
Electric Boat
mlabriol@xxxxxxxx
401-848-8871 (desk)
401-848-8513 (lab)
401-316-9844 (cell)



 




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