[mythtv] fixes/31 branch created!

[Mike Bibbings]

On 10/03/2020 16:10, Piotr Oniszczuk wrote:
>
>> Wiadomość napisana przez Mike Bibbings <mike.bibbings at gmail.com> w dniu 10.03.2020, o godz. 13:57:
>>
>> Hi Mark,
>>
>> Latest version v32-Pre-151-g4e81d4b52b  working well on Pi4.
>>
>> On a Pi2 I am seeing from time to time - it is fatal, and it needs a reboot to resolve.
>>
>> [ 4067.968745] [drm:vc4_bo_create [vc4]] *ERROR* Failed to allocate from CMA:
>> [ 4067.968765] [drm]                            V3D: 158964kb BOs (1142)
>> [ 4067.968771] [drm]                     V3D shader:     84kb BOs (21)
>> [ 4067.968778] [drm]                           dumb:   8116kb BOs (2)
>> [ 4067.968783] [drm]                         binner:  16384kb BOs (1)
>> [ 4067.968789] [drm]                total purged BO:  21216kb BOs (112)
>> [ 4067.970319] [drm:vc4_bo_create [vc4]] *ERROR* Failed to allocate from CMA:
>> [ 4067.970333] [drm]                            V3D: 151216kb BOs (1114)
>> [ 4067.970339] [drm]                     V3D shader:     84kb BOs (21)
>> [ 4067.970343] [drm]                           dumb:   8116kb BOs (2)
>> [ 4067.970349] [drm]                         binner:  16384kb BOs (1)
>> [ 4067.970354] [drm]                total purged BO:  21216kb BOs (112)
>> [ 4067.981562] [drm:vc4_bo_create [vc4]] *ERROR* Failed to allocate from CMA:
>> [ 4067.981577] [drm]                            V3D: 151216kb BOs (1114)
>> [ 4067.981583] [drm]                     V3D shader:     84kb BOs (21)
>> [ 4067.981588] [drm]                           dumb:   8116kb BOs (2)
>> [ 4067.981595] [drm]                         binner:  16384kb BOs (1)
>> [ 4067.981601] [drm]                total purged BO:  21216kb BOs (112)
>> [ 4068.076587] [drm:vc4_bo_create [vc4]] *ERROR* Failed to allocate from CMA:
>> [ 4068.076607] [drm]                            V3D: 159380kb BOs (1116)
>> [ 4068.076613] [drm]                     V3D shader:     84kb BOs (21)
>> [ 4068.076620] [drm]                           dumb:   8116kb BOs (2)
>> [ 4068.076627] [drm]                total purged BO:  31516kb BOs (174)
>> [ 4068.076642] vc4_v3d 3fc00000.v3d: Failed to allocate memory for tile binning: -12. You may need to enable CMA or give it more memory.
>>
>> Note this is using mythfrontend only  to a remote backend.
>>
>> Have you or anyone else seen this ?
>>
> looks to me like kernel has too smal CMA to operate with video playback.
> cma is needed as video frames decoded by decoder and passed to 3D engine needs continues memory regions (rpi iirc don’t have IOMMU to help here)
> may you pls try do add in config.txt i.e.
> cma=256 (or 384)
> and see how it goes?
>
> ____________________________________________

kernel already has cma=256

[    0.000000] cma: Reserved 256 MiB at 0x1ec00000
[    0.000000] Kernel command line: coherent_pool=1M cma=256M 
video=HDMI-A-1:1920x1080M at 50,margin_left=0,margin_right=0,margin_top=0,margin_bottom=0 
smsc95xx.macaddr=B8:27:EB:F3:20:52 vc_mem.mem_base=0x3ec00000 
vc_mem.mem_size=0x40000000  console=ttyAMA0,115200 console=tty1 
root=PARTUUID=ea7d04d6-02 rootfstype=ext4 elevator=deadline 
fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
[    0.000000] Memory: 684636K/970752K available (8192K kernel code, 
653K rwdata, 2220K rodata, 1024K init, 822K bss, 23972K reserved, 
262144K cma-reserved)

The problem can take many hours to appear but when it does, it requires 
a hard reboot (power off then on) unless already logged in via ssh from 
another machine, in which case sudo reboot works.

Mike