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 and reset the PCI link of the 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/ Andrey Grodzovsky (7): drm/amdgpu: Implement DPC recovery 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 recoveries failure. drm/amdgpu: Trim amdgpu_pci_slot_reset by reusing code. drm/amdgpu: Disable DPC for XGMI for now. drivers/gpu/drm/amd/amdgpu/amdgpu.h | 16 ++ drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 289 ++++++++++++++++++++++++++++- drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 13 +- drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c | 6 + drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c | 6 + drivers/gpu/drm/amd/amdgpu/atom.c | 1 + 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/amdgpu_smu.c | 3 + drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c | 3 + 11 files changed, 344 insertions(+), 19 deletions(-) -- 2.7.4 _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
