[PATCH v4 0/8] Implement PCI Error Recovery on Navi12

[Bjorn Helgaas]

On Wed, Sep 02, 2020 at 02:42:02PM -0400, Andrey Grodzovsky wrote:
> Many PCI bus controllers are able to detect a variety of hardware PCI errors on the bus, 
> such as parity errors on the data and address buses,  A typical action taken is to disconnect 
> the affected device, halting all I/O to it. Typically, a reconnection mechanism is also offered, 
> so that the affected PCI device(s) are reset and put back into working condition. 
> In our case the reconnection mechanism is facilitated by kernel Downstream Port Containment (DPC) 
> driver which will intercept the PCIe error, remove (isolate) the faulting device after which it 
> will call into PCIe recovery code of the PCI core. 
> This code will call hooks which are implemented in this patchset where the error is 
> first reported at which point we block the GPU scheduler, next DPC resets the 
> PCI link which generates HW interrupt which is intercepted by SMU/PSP who 
> start executing mode1 reset of the ASIC, next step is slot reset hook is called 
> at which point we wait for ASIC reset to complete, restore PCI config space and run 
> HW suspend/resume sequence to resinit the ASIC. 
> Last hook called is resume normal operation at which point we will restart the GPU scheduler.
> 
> More info on PCIe error handling and DPC are here:
> https://www.kernel.org/doc/html/latest/PCI/pci-error-recovery.html
> https://patchwork.kernel.org/patch/8945681/
> 
> v4:Rebase to 5.9 kernel and revert PCI error recovery core commit which breaks the feature.

What does this apply to?  I tried 

  - v5.9-rc1 (9123e3a74ec7 ("Linux 5.9-rc1")),
  - v5.9-rc2 (d012a7190fc1 ("Linux 5.9-rc2")),
  - v5.9-rc3 (f75aef392f86 ("Linux 5.9-rc3")),
  - drm-next (3393649977f9 ("Merge tag 'drm-intel-next-2020-08-24-1' of git://anongit.freedesktop.org/drm/drm-intel into drm-next")),
  - linux-next (4442749a2031 ("Add linux-next specific files for 20200902"))

but it doesn't apply cleanly to any.

> Andrey Grodzovsky (8):
>   drm/amdgpu: Avoid accessing HW when suspending SW state
>   drm/amdgpu: Block all job scheduling activity during DPC recovery
>   drm/amdgpu: Fix SMU error failure
>   drm/amdgpu: Fix consecutive DPC recovery failures.
>   drm/amdgpu: Trim amdgpu_pci_slot_reset by reusing code.
>   drm/amdgpu: Disable DPC for XGMI for now.
>   drm/amdgpu: Minor checkpatch fix
>   Revert "PCI/ERR: Update error status after reset_link()"
> 
>  drivers/gpu/drm/amd/amdgpu/amdgpu.h        |   6 +
>  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 247 +++++++++++++++++++++--------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c    |   4 +-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c    |   6 +
>  drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c    |   6 +
>  drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c     |  18 ++-
>  drivers/gpu/drm/amd/amdgpu/nv.c            |   4 +-
>  drivers/gpu/drm/amd/amdgpu/soc15.c         |   4 +-
>  drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c     |   3 +
>  drivers/pci/pcie/err.c                     |   3 +-
>  10 files changed, 222 insertions(+), 79 deletions(-)
> 
> -- 
> 2.7.4
>