GPU driver crash on i.MX8M-Mini with 4GB RAM

[felixradensky]

Hello,

We're experiencing GPU driver (galcore) crash on our i.MX8M-Mini board with 4GB of RAM running latest NXP BSP 4.14.98-2.0.1. Restricting memory size to 3GB by passing mem=3G kernel command line parameter fixes the problem. Is this a known problem ? 

Felix.

[r_trivedi123]

Hi, Even this issues still persist in kernel v5.15.71 in NXP BSP - kirkstone branch.

We faced it with one of our customer for sway compositor.

[   27.464790] etnaviv-gpu 38000000.gpu: AXI bus error
[   27.469745] etnaviv-gpu 38000000.gpu: MMU fault status 0x00000000
[   27.970450] etnaviv-gpu 38000000.gpu: recover hung GPU!

However we were able to resolve the issue and now its running smooth with the weston and sway compositor with 4GiB RAM usage.

As this was done for the customer we are unable to share the details, in case of support please reach-out to us on rutvij.trivedi@siliconsignals.io or visit www.siliconsignals.io.

--
BR

[Yuri]

Hello,

  According to section 2.1.2 (Cortex-A53 Memory Map) of i.MX 8M Mini  Reference Manual,

Rev. 1, 03/2019, only 3072MB of DDR Memory address area  are available for all modules,

including GPU. But address range, starting from 0x1_0000_0000 is accessible only 

by the ARM Cores.  This provides problem for NXP Linux, in particular for GPU DMA.  

Have a great day,
Yuri

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[felixradensky]

Hi Yuri

The following patch: linux-imx - i.MX Linux kernel  fixed GPU memory access for i.MX8M but missed to do the same for i.MX8M Mini. Adding check for "fsl,imx8mm-gpu" fixes the crash on Mini.

Felix.