Re: Losing completion interrupts with amdgpu on rx460

Tue, 27 Dec 2016 13:06:52 -0800

It's a well known problem that the completion interrupts are notorious unreliable.
That's why we have a fallback timer in amdgpu_fence.c which kicks an extra hardware probe after a certain timeout. Please double check that this one is working as expected. 


Another possibility is that the memory where the fence is written 
doesn't has the proper attributes (e.g. USWC vs. cached vs. uncached).


Regards,
Christian.

Am 26.12.2016 um 02:54 schrieb Matthew Macy:

I'm running an rx460 using the amdgpu driver from Linux 4.8 with Mesa 13/LLVM 
3.9 and Xorg 1.18 on FreeBSD. It seems to largely perform pretty well.

However, ever since I got Mesa working I will inevitably end up losing 
completion interrupts after X has been running for a brief period. I can bring 
the problem on more quickly by running glxgears with vblank_mode=0. It's a safe 
bet that the problem with the linuxkpi. However, since this bug is manifesting 
itself in a very hardware specific way I'm coming here for advice on what I can 
do to dump device state to better understand why it ceases to fire interrupts.

I enabled FENCE_TRACE and added some logging to fence creation and 
fence_default_wait as well. The last interrupt in this particular excerpt is:

"Dec 22 22:36:22 daleks kernel: fence at 210850477167 f 0#233745: signaled from irq 
context"

amdgpu_cs_wait goes on to sleep on 411#116530 and never wake up. Any guidance 
would be much appreciated. Thanks in advance.




Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] pid=100793, dev=0xe200, auth=1, 
AMDGPU_BO_LIST
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl]
Dec 22 22:36:22 daleks kernel: &fence->scheduled at 210850212762 f 86#116944: 
signaled from irq context
Dec 22 22:36:22 daleks kernel: pid=100699, dev=0xe200, auth=1, AMDGPU_BO_LIST
Dec 22 22:36:22 daleks kernel: [drm:amdgpu_ih_process] [drm:drm_ioctl] 
pid=100793, dev=0xe200, auth=1, AMDGPU_CS
Dec 22 22:36:22 daleks kernel: amdgpu_ih_process: rptr 864, wptr 880
Dec 22 22:36:22 daleks kernel: [drm:gfx_v8_0_eop_irq] IH: CP EOP
Dec 22 22:36:22 daleks kernel: &fence->finished at 210850251259 f 411#116528: 
signaled from irq context
Dec 22 22:36:22 daleks kernel: fence at 210850253222 f 0#233742: signaled from 
irq context
Dec 22 22:36:22 daleks kernel: [drm:amdgpu_ih_process] amdgpu_ih_process: rptr 
880, wptr 880
Dec 22 22:36:22 daleks kernel: [drm:amdgpu_ih_process] created fence 410#116529 
411#116529 @210850271550
Dec 22 22:36:22 daleks kernel: amdgpu_ih_process: rptr 880, wptr 896
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] [drm:gfx_v8_0_eop_irq] 
pid=100793, dev=0xe200, auth=1, AMDGPU_BO_LIST
Dec 22 22:36:22 daleks kernel: IH: CP EOP
Dec 22 22:36:22 daleks kernel: &fence->finished at 210850308909 f 87#116944: 
signaled from irq context
Dec 22 22:36:22 daleks kernel: fence at 210850310670 f 0#233743: signaled from 
irq context
Dec 22 22:36:22 daleks kernel: [drm:amdgpu_ih_process] amdgpu_ih_process: rptr 
896, wptr 896
Dec 22 22:36:22 daleks kernel: &fence->scheduled at 210850325151 f 410#116529: 
signaled from irq context
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] pid=100699, dev=0xe200, auth=1, 
AMDGPU_BO_LIST
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] pid=100699, dev=0xe200, auth=1, 
AMDGPU_CS
Dec 22 22:36:22 daleks kernel: created fence 86#116945 87#116945 @210850375328
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] pid=100793, dev=0xe200, auth=1, 
AMDGPU_BO_LIST
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl]
Dec 22 22:36:22 daleks kernel: &fence->scheduled at 210850389385 f 86#116945: 
signaled from irq context
Dec 22 22:36:22 daleks kernel: [drm:amdgpu_ih_process] pid=100699, dev=0xe200, 
auth=1, AMDGPU_BO_LIST
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] amdgpu_ih_process: rptr 896, 
wptr 912
Dec 22 22:36:22 daleks kernel: [drm:gfx_v8_0_eop_irq] IH: CP EOP
Dec 22 22:36:22 daleks kernel: &fence->finished at 210850416620 f 411#116529: 
signaled from irq context
Dec 22 22:36:22 daleks kernel: fence at 210850418382 f 0#233744: signaled from 
irq context
Dec 22 22:36:22 daleks kernel: pid=100793, dev=0xe200, auth=1, AMDGPU_CS
Dec 22 22:36:22 daleks kernel: [drm:amdgpu_ih_process] created fence 410#116530 
411#116530 @210850440720
Dec 22 22:36:22 daleks kernel: amdgpu_ih_process: rptr 912, wptr 912
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] [drm:amdgpu_ih_process] 
amdgpu_ih_process: rptr 912, wptr 928
Dec 22 22:36:22 daleks kernel: [drm:gfx_v8_0_eop_irq] IH: CP EOP
Dec 22 22:36:22 daleks kernel: &fence->finished at 210850475397 f 87#116945: 
signaled from irq context
Dec 22 22:36:22 daleks kernel: fence at 210850477167 f 0#233745: signaled from 
irq context
Dec 22 22:36:22 daleks kernel: pid=100793, dev=0xe200, auth=1, AMDGPU_BO_LIST
Dec 22 22:36:22 daleks kernel: [drm:amdgpu_ih_process] amdgpu_ih_process: rptr 
928, wptr 928
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] pid=100699, dev=0xe200, auth=1, 
AMDGPU_BO_LIST
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] pid=100699, dev=0xe200, auth=1, 
AMDGPU_CS
Dec 22 22:36:22 daleks kernel: created fence 86#116946 87#116946 @210850557790
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] pid=100793, dev=0xe200, auth=1, 
AMDGPU_BO_LIST
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] pid=100699, dev=0xe200, auth=1, 
AMDGPU_BO_LIST
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] pid=100793, dev=0xe200, auth=1, 
AMDGPU_CS
Dec 22 22:36:22 daleks kernel: created fence 410#116531 411#116531 @210850614023
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] pid=100793, dev=0xe200, auth=1, 
AMDGPU_BO_LIST
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] pid=100699, dev=0xe200, auth=1, 
AMDGPU_BO_LIST
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] pid=100699, dev=0xe200, auth=1, 
AMDGPU_CS
Dec 22 22:36:22 daleks kernel: created fence 86#116947 87#116947 @210850719230
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] pid=100793, dev=0xe200, auth=1, 
AMDGPU_WAIT_CS
Dec 22 22:36:22 daleks kernel: [drm:drm_ioctl] amdgpu_cs_wait on 411#116530
Dec 22 22:36:22 daleks kernel: pid=100699, dev=0xe200, auth=1, AMDGPU_BO_LIST
Dec 22 22:36:22 daleks kernel: 411#116530 sleeping tid 100793 at 210850747487


-M

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