[5.14-rc5] etnaviv-gpu 130000.gpu: recover hung GPU!

[Wadim Egorov]

Hi,

we have noticed "recover hung GPU" messages with the latest Linux on a i.MX6 
Solo. The GPU recover message appears after some time running a Qt application 
with QT_QPA_PLATFORM=eglfs and Mesa 21.0.3.
So far there are no problems with the GUI. Nevertheless, we want to understand 
the cause of the problem.

Below is the output from the viv-unpack tool of a coredump we've saved. 
Unfortunately, I am not familiar with the whole DRM/GPU framework and don't 
really know how to proceed and provide more relevant debug information.

Is this a known problem?

Regards,
Wadim


=== Register dump
0000000c = 00000051
00000000 = 00040100
00000004 = 7ffffff6 Idle: FE- DE+ PE+ SH- PA+ SE+ RA+ TX+ VG+ IM+ FP+ TS+
00000008 = 00002200
00000014 = ffffffff
00000018 = 0c010000
0000001c = e02864ad
00000020 = 00000880
00000024 = 00005106
00000028 = 20110511
0000002c = 01012500
00000034 = c9f99eff
00000038 = c9f99eff
00000070 = 00000000
00000100 = 00140021
00000104 = 00000010
00000108 = 000000e4
0000010c = 00000000
00000400 = 2a200000
00000404 = 2a200000
00000408 = 2a200000
0000040c = 2a200000
00000410 = 2a200000
00000414 = 3e000000
00000418 = 28000000
0000041c = 28000000
00000420 = 28000000
00000424 = 28000000
00000428 = 28000000
0000042c = 2a230000
00000480 = 00000088
0000065c = 00000001
00000660 = 00000804 Cmd: [adr1 DMA: idle Fetch: valid] Req idle Cal idle
00000664 = 02082650 Command DMA address
00000668 = 08010380 FE fetched word 0
0000066c = 00000003 FE fetched word 1
00000670 = 00000000
=== Buffers
  Num Name  IOVA     Size
    0 reg   00000000 00000128      296
    1 mmu   00000000 00200000  2097152
    2 ring  02080000 00001000     4096
*  3 cmd   02082000 00000a08     2568
    4 bomap 00000000 00006300    25344
    5 bo    80a07000 00003000    12288
    6 bo    80003000 00003000    12288
    7 bo    80006000 00100000  1048576
    8 bo    80a0a000 00001000     4096
    9 bo    80107000 00280000  2621440
   10 bo    80a0b000 00280000  2621440
   11 bo    80106000 00001000     4096
   12 bo    80607000 00400000  4194304
   13 bo    02700000 00258000  2457600

Checking MMU entries... ok