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 >
