ACK: [PATCH 0/5][SRU][Plucky/Oracular] Unexpected system reboot at loading GUI session on some AMD platforms

[Edoardo Canepa]

Acked-by: Edoardo Canepa <edoardo.canepa at canonical.com>

On 05/06/25 20:34, You-Sheng Yang wrote:
> BugLink: https://bugs.launchpad.net/bugs/2112462
>
> [ Impact ]
>
> AMD Strix Halo devices experience unexpected reboots while starting GUI
> session every boot.
>
> This is caused by:
> * 689275140cb8e drm/amdgpu/hdp7.0: do a posting read when flushing HDP
> * abe1cbaec6cfe drm/amdgpu/hdp6.0: do a posting read when flushing HDP
> * f756dbac1ce1d drm/amdgpu/hdp5.2: do a posting read when flushing HDP
> * cf424020e040b drm/amdgpu/hdp5.0: do a posting read when flushing HDP
> * c9b8dcabb52af drm/amdgpu/hdp4.0: do a posting read when flushing HDP
>
> And fixed by:
> * 5a11a27677311 drm/amdgpu/hdp7: use memcfg register to post the write for HDP flush
> * ca28e80abe421 drm/amdgpu/hdp6: use memcfg register to post the write for HDP flush
> * dbc988c689333 drm/amdgpu/hdp5.2: use memcfg register to post the write for HDP flush
> * 0e33e0f339b91 drm/amdgpu/hdp5: use memcfg register to post the write for HDP flush
> * f690e3974755a drm/amdgpu/hdp4: use memcfg register to post the write for HDP flush
>
> [ Test Plan ]
>
> 1. Install -proposed kernel
> 2. Reboot to the installed kernel and check if the device may finish boot
>     process to GUI session.
>
> [ Where problems could occur ]
>
> No. This fix a problem when reading back the whole mapped
> KFD_MMIO_REMAP_HDP_MEM_FLUSH_CNTL register by reading another register that
> also triggers the flush.
>
> [ Other Info ]
>
> The causing commits were first committed to v6.13-rc1 , and have also been
> backported to v6.12.5, v6.6.69, v6.1.120. The fixes are available in
> v6.15-rc6, also backported to v6.14.7, v6.12.29, v6.6.91, v6.1.139,
> therefore this affects following Ubuntu kernels:
> * linux/plucky: all (currently 6.14.0-22.22)
> * linux-oem-6.14/noble: all (currently 6.14.0-1005.5)
> * linux/oracular: 6.11.0-20.20 to latest (currently 6.11.0-28.28)
> * linux-oem-6.11/noble: 6.11.0-1017.17 to latest (currently 6.11.0-1024.24)
> * linux/noble: 6.8.0-58.60 to latest (currently 6.8.0-62.65)
> * linux-oem-6.8/noble: 6.8.0-1026.26 to latest (currently 6.8.0-1029.29)
>
> Nominate for linux/noble, linux-oem-6.8/noble, linux/oracular,
> linux-oem-6.11/noble, linux/plucky, and linux-oem-6.14/noble.
>
> Alex Deucher (5):
>    drm/amdgpu/hdp4: use memcfg register to post the write for HDP flush
>    drm/amdgpu/hdp5: use memcfg register to post the write for HDP flush
>    drm/amdgpu/hdp5.2: use memcfg register to post the write for HDP flush
>    drm/amdgpu/hdp6: use memcfg register to post the write for HDP flush
>    drm/amdgpu/hdp7: use memcfg register to post the write for HDP flush
>
>   drivers/gpu/drm/amd/amdgpu/hdp_v4_0.c |  7 ++++++-
>   drivers/gpu/drm/amd/amdgpu/hdp_v5_0.c |  7 ++++++-
>   drivers/gpu/drm/amd/amdgpu/hdp_v5_2.c | 12 +++++++++++-
>   drivers/gpu/drm/amd/amdgpu/hdp_v6_0.c |  7 ++++++-
>   drivers/gpu/drm/amd/amdgpu/hdp_v7_0.c |  7 ++++++-
>   5 files changed, 35 insertions(+), 5 deletions(-)
>
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