Boot failures in -next on Jetson TK1

[Thierry Reding]

On Sat, May 26, 2018 at 11:36:29AM +0100, Mark Brown wrote:
> Currently -next is failing to boot on Jetson TK1.  The problem looks to
> be the Nouveau driver, during initialization it reports an address
> decode error then starts printing error messages saying "nouveau
> 57000000.gpu: fifo: SCHED_ERROR 20 []" over and over again.
> 
> I've pasted the start of the errors below, you can see a full log and
> more details at:
> 
>    https://kernelci.org/boot/id/5b0882a259b514339779a881/
> 
> The warnings about Spectre are a separate issue and don't seem to affect
> the boot.
> 
> [ 15.194484] nouveau 57000000.gpu: NVIDIA GK20A (0ea000a1)
> [   15.200109] udevd[109]: could not rename interface '3' from 'eth0' to 'enp1s0': Device or resource busy
> [   15.206399] nouveau 57000000.gpu: imem: using IOMMU
> [   15.315122] CPU2: Spectre v2: firmware did not set auxiliary control register IBE bit, system vulnerable
> [   15.320021] nouveau 57000000.gpu: Direct firmware load for nvidia/gk20a/fecs_inst.bin failed with error -2
> [   15.384841] nouveau 57000000.gpu: Direct firmware load for nouveau/nvea_fuc409c failed with error -2
> [   15.393972] nouveau 57000000.gpu: Direct firmware load for nouveau/fuc409c failed with error -2
> [   15.402679] nouveau 57000000.gpu: gr: failed to load fuc409c
> [   15.409434] CPU1: Spectre v2: firmware did not set auxiliary control register IBE bit, system vulnerable
> [   15.419398] CPU1: Spectre v2: firmware did not set auxiliary control register IBE bit, system vulnerable
> [   15.482568] tegra-mc 70019000.memory-controller: gpusrd: read @0x00041200: EMEM address decode error (EMEM decode error)
> [   15.491232] [TTM] Zone  kernel: Available graphics memory: 375202 kiB
> [   15.502768] [TTM] Zone highmem: Available graphics memory: 1030050 kiB
> [   15.509290] [TTM] Initializing pool allocator
> [   15.513658] nouveau 57000000.gpu: DRM: VRAM: 0 MiB
> [   15.518451] nouveau 57000000.gpu: DRM: GART: 1048576 MiB
> [   15.526546] CPU1: Spectre v2: firmware did not set auxiliary control register IBE bit, system vulnerable
> [   15.527290] tegra-mc 70019000.memory-controller: gpusrd: read @0x00072000: EMEM address decode error (EMEM decode error)
> [   15.537050] CPU1: Spectre v2: firmware did not set auxiliary control register IBE bit, system vulnerable
> [   15.546928] nouveau 57000000.gpu: fifo: SCHED_ERROR 20 []

This is a known issue that was introduced in v4.16 by a combination of
the 32-bit ARM DMA/IOMMU glue and an Tegra SMMU driver change.

There is a fix here:

	http://patchwork.ozlabs.org/patch/902830/

Which got remotely NAK'ed by the DMA API maintainer. I then came up with
this, based on feedback from Christoph:

	http://patchwork.ozlabs.org/project/linux-tegra/list/?series=40853

But that's kind of blocked right now, awaiting feedback. I'll send out
another version, which will hopefully strike the right balance.

Thierry
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