On 26/05/2023 19:20, Aravind Iddamsetty wrote: > Our hardware supports RAS(Reliability, Availability, Serviceability) by > exposing a set of error counters which can be used by observability > tools to take corrective actions or repairs. Traditionally there were > being exposed via PMU (for relative counters) and sysfs interface (for > absolute value) in our internal branch. But, due to the limitations in > this approach to use two interfaces and also not able to have an event > based reporting or configurability, an alternative approach to try > netlink was suggested by community for drm subsystem wide UAPI for RAS > and telemetry as discussed in [1]. > > This [1] is the inspiration to this series. It uses the generic > netlink(genl) family subsystem and exposes a set of commands that can > be used by every drm driver, the framework provides a means to have > custom commands too. Each drm driver instance in this example xe driver > instance registers a family and operations to the genl subsystem through > which it enumerates and reports the error counters. An event based > notification is also supported to which userpace can subscribe to and > be notified when any error occurs and read the error counter this avoids > continuous polling on error counter. This can also be extended to > threshold based notification. Hi Aravind, The habanalabs driver is another candidate to use this netlink-based drm framework. As a single-user device, we have an additional "control" device that allows multiple applications to query for information and to monitor the "compute" device. And while we are about to move the compute device to the accel nodes, we don't have a real replacement there for the control device. Another possible usage of this framework for habanalabs is the events notification. Currently we have an eventfd-based mechanism, and after being notified about an event, user starts querying about the event and the relevant info, usually in several requests. With this framework we should be allegedly possible to gather all relevant info together with the event itself. The current implementation seems intended more to errors (and quite "tailored" to Xe needs ...), while in habanalabs we would need it also for non-error static/dynamic info. Maybe we should revise the existing commands/attributes to be more generic? Moreover, the drm part is very small, while most of the netlink "mess" is still done by the specific driver. So what is the added value in making it a "drm framework"? Do we enforce something here for drm drivers that use it? Do we help them with simpler APIs and hiding the internals of netlink? Maybe it would be worth moving some functionality from the Xe driver into drm helpers? Thanks, Tomer > [1]: https://airlied.blogspot.com/2022/09/accelerators-bof-outcomes-summary.html > > this series is on top of https://patchwork.freedesktop.org/series/116181/ > > Below is an example tool drm_ras which demonstrates the use of the > supported commands. The tool will be sent to ML with the subject > "[RFC i-g-t 0/1] A tool to demonstrate use of netlink sockets to read RAS error counters" > > read single error counter: > > $ ./drm_ras READ_ONE --device=drm:/dev/dri/card1 --error_id=0x0000000000000005 > counter value 0 > > read all error counters: > > $ ./drm_ras READ_ALL --device=drm:/dev/dri/card1 > name config-id counter > > error-gt0-correctable-guc 0x0000000000000001 0 > error-gt0-correctable-slm 0x0000000000000003 0 > error-gt0-correctable-eu-ic 0x0000000000000004 0 > error-gt0-correctable-eu-grf 0x0000000000000005 0 > error-gt0-fatal-guc 0x0000000000000009 0 > error-gt0-fatal-slm 0x000000000000000d 0 > error-gt0-fatal-eu-grf 0x000000000000000f 0 > error-gt0-fatal-fpu 0x0000000000000010 0 > error-gt0-fatal-tlb 0x0000000000000011 0 > error-gt0-fatal-l3-fabric 0x0000000000000012 0 > error-gt0-correctable-subslice 0x0000000000000013 0 > error-gt0-correctable-l3bank 0x0000000000000014 0 > error-gt0-fatal-subslice 0x0000000000000015 0 > error-gt0-fatal-l3bank 0x0000000000000016 0 > error-gt0-sgunit-correctable 0x0000000000000017 0 > error-gt0-sgunit-nonfatal 0x0000000000000018 0 > error-gt0-sgunit-fatal 0x0000000000000019 0 > error-gt0-soc-fatal-psf-csc-0 0x000000000000001a 0 > error-gt0-soc-fatal-psf-csc-1 0x000000000000001b 0 > error-gt0-soc-fatal-psf-csc-2 0x000000000000001c 0 > error-gt0-soc-fatal-punit 0x000000000000001d 0 > error-gt0-soc-fatal-psf-0 0x000000000000001e 0 > error-gt0-soc-fatal-psf-1 0x000000000000001f 0 > error-gt0-soc-fatal-psf-2 0x0000000000000020 0 > error-gt0-soc-fatal-cd0 0x0000000000000021 0 > error-gt0-soc-fatal-cd0-mdfi 0x0000000000000022 0 > error-gt0-soc-fatal-mdfi-east 0x0000000000000023 0 > error-gt0-soc-fatal-mdfi-south 0x0000000000000024 0 > error-gt0-soc-fatal-hbm-ss0-0 0x0000000000000025 0 > error-gt0-soc-fatal-hbm-ss0-1 0x0000000000000026 0 > error-gt0-soc-fatal-hbm-ss0-2 0x0000000000000027 0 > error-gt0-soc-fatal-hbm-ss0-3 0x0000000000000028 0 > error-gt0-soc-fatal-hbm-ss0-4 0x0000000000000029 0 > error-gt0-soc-fatal-hbm-ss0-5 0x000000000000002a 0 > error-gt0-soc-fatal-hbm-ss0-6 0x000000000000002b 0 > error-gt0-soc-fatal-hbm-ss0-7 0x000000000000002c 0 > error-gt0-soc-fatal-hbm-ss1-0 0x000000000000002d 0 > error-gt0-soc-fatal-hbm-ss1-1 0x000000000000002e 0 > error-gt0-soc-fatal-hbm-ss1-2 0x000000000000002f 0 > error-gt0-soc-fatal-hbm-ss1-3 0x0000000000000030 0 > error-gt0-soc-fatal-hbm-ss1-4 0x0000000000000031 0 > error-gt0-soc-fatal-hbm-ss1-5 0x0000000000000032 0 > error-gt0-soc-fatal-hbm-ss1-6 0x0000000000000033 0 > error-gt0-soc-fatal-hbm-ss1-7 0x0000000000000034 0 > error-gt0-soc-fatal-hbm-ss2-0 0x0000000000000035 0 > error-gt0-soc-fatal-hbm-ss2-1 0x0000000000000036 0 > error-gt0-soc-fatal-hbm-ss2-2 0x0000000000000037 0 > error-gt0-soc-fatal-hbm-ss2-3 0x0000000000000038 0 > error-gt0-soc-fatal-hbm-ss2-4 0x0000000000000039 0 > error-gt0-soc-fatal-hbm-ss2-5 0x000000000000003a 0 > error-gt0-soc-fatal-hbm-ss2-6 0x000000000000003b 0 > error-gt0-soc-fatal-hbm-ss2-7 0x000000000000003c 0 > error-gt0-soc-fatal-hbm-ss3-0 0x000000000000003d 0 > error-gt0-soc-fatal-hbm-ss3-1 0x000000000000003e 0 > error-gt0-soc-fatal-hbm-ss3-2 0x000000000000003f 0 > error-gt0-soc-fatal-hbm-ss3-3 0x0000000000000040 0 > error-gt0-soc-fatal-hbm-ss3-4 0x0000000000000041 0 > error-gt0-soc-fatal-hbm-ss3-5 0x0000000000000042 0 > error-gt0-soc-fatal-hbm-ss3-6 0x0000000000000043 0 > error-gt0-soc-fatal-hbm-ss3-7 0x0000000000000044 0 > error-gt0-gsc-correctable-sram-ecc 0x0000000000000045 0 > error-gt0-gsc-nonfatal-mia-shutdown 0x0000000000000046 0 > error-gt0-gsc-nonfatal-mia-int 0x0000000000000047 0 > error-gt0-gsc-nonfatal-sram-ecc 0x0000000000000048 0 > error-gt0-gsc-nonfatal-wdg-timeout 0x0000000000000049 0 > error-gt0-gsc-nonfatal-rom-parity 0x000000000000004a 0 > error-gt0-gsc-nonfatal-ucode-parity 0x000000000000004b 0 > error-gt0-gsc-nonfatal-glitch-det 0x000000000000004c 0 > error-gt0-gsc-nonfatal-fuse-pull 0x000000000000004d 0 > error-gt0-gsc-nonfatal-fuse-crc-check 0x000000000000004e 0 > error-gt0-gsc-nonfatal-selfmbist 0x000000000000004f 0 > error-gt0-gsc-nonfatal-aon-parity 0x0000000000000050 0 > error-gt1-correctable-guc 0x1000000000000001 0 > error-gt1-correctable-slm 0x1000000000000003 0 > error-gt1-correctable-eu-ic 0x1000000000000004 0 > error-gt1-correctable-eu-grf 0x1000000000000005 0 > error-gt1-fatal-guc 0x1000000000000009 0 > error-gt1-fatal-slm 0x100000000000000d 0 > error-gt1-fatal-eu-grf 0x100000000000000f 0 > error-gt1-fatal-fpu 0x1000000000000010 0 > error-gt1-fatal-tlb 0x1000000000000011 0 > error-gt1-fatal-l3-fabric 0x1000000000000012 0 > error-gt1-correctable-subslice 0x1000000000000013 0 > error-gt1-correctable-l3bank 0x1000000000000014 0 > error-gt1-fatal-subslice 0x1000000000000015 0 > error-gt1-fatal-l3bank 0x1000000000000016 0 > error-gt1-sgunit-correctable 0x1000000000000017 0 > error-gt1-sgunit-nonfatal 0x1000000000000018 0 > error-gt1-sgunit-fatal 0x1000000000000019 0 > error-gt1-soc-fatal-psf-csc-0 0x100000000000001a 0 > error-gt1-soc-fatal-psf-csc-1 0x100000000000001b 0 > error-gt1-soc-fatal-psf-csc-2 0x100000000000001c 0 > error-gt1-soc-fatal-punit 0x100000000000001d 0 > error-gt1-soc-fatal-psf-0 0x100000000000001e 0 > error-gt1-soc-fatal-psf-1 0x100000000000001f 0 > error-gt1-soc-fatal-psf-2 0x1000000000000020 0 > error-gt1-soc-fatal-cd0 0x1000000000000021 0 > error-gt1-soc-fatal-cd0-mdfi 0x1000000000000022 0 > error-gt1-soc-fatal-mdfi-east 0x1000000000000023 0 > error-gt1-soc-fatal-mdfi-south 0x1000000000000024 0 > error-gt1-soc-fatal-hbm-ss0-0 0x1000000000000025 0 > error-gt1-soc-fatal-hbm-ss0-1 0x1000000000000026 0 > error-gt1-soc-fatal-hbm-ss0-2 0x1000000000000027 0 > error-gt1-soc-fatal-hbm-ss0-3 0x1000000000000028 0 > error-gt1-soc-fatal-hbm-ss0-4 0x1000000000000029 0 > error-gt1-soc-fatal-hbm-ss0-5 0x100000000000002a 0 > error-gt1-soc-fatal-hbm-ss0-6 0x100000000000002b 0 > error-gt1-soc-fatal-hbm-ss0-7 0x100000000000002c 0 > error-gt1-soc-fatal-hbm-ss1-0 0x100000000000002d 0 > error-gt1-soc-fatal-hbm-ss1-1 0x100000000000002e 0 > error-gt1-soc-fatal-hbm-ss1-2 0x100000000000002f 0 > error-gt1-soc-fatal-hbm-ss1-3 0x1000000000000030 0 > error-gt1-soc-fatal-hbm-ss1-4 0x1000000000000031 0 > error-gt1-soc-fatal-hbm-ss1-5 0x1000000000000032 0 > error-gt1-soc-fatal-hbm-ss1-6 0x1000000000000033 0 > error-gt1-soc-fatal-hbm-ss1-7 0x1000000000000034 0 > error-gt1-soc-fatal-hbm-ss2-0 0x1000000000000035 0 > error-gt1-soc-fatal-hbm-ss2-1 0x1000000000000036 0 > error-gt1-soc-fatal-hbm-ss2-2 0x1000000000000037 0 > error-gt1-soc-fatal-hbm-ss2-3 0x1000000000000038 0 > error-gt1-soc-fatal-hbm-ss2-4 0x1000000000000039 0 > error-gt1-soc-fatal-hbm-ss2-5 0x100000000000003a 0 > error-gt1-soc-fatal-hbm-ss2-6 0x100000000000003b 0 > error-gt1-soc-fatal-hbm-ss2-7 0x100000000000003c 0 > error-gt1-soc-fatal-hbm-ss3-0 0x100000000000003d 0 > error-gt1-soc-fatal-hbm-ss3-1 0x100000000000003e 0 > error-gt1-soc-fatal-hbm-ss3-2 0x100000000000003f 0 > error-gt1-soc-fatal-hbm-ss3-3 0x1000000000000040 0 > error-gt1-soc-fatal-hbm-ss3-4 0x1000000000000041 0 > error-gt1-soc-fatal-hbm-ss3-5 0x1000000000000042 0 > error-gt1-soc-fatal-hbm-ss3-6 0x1000000000000043 0 > error-gt1-soc-fatal-hbm-ss3-7 0x1000000000000044 0 > > wait on a error event: > > $ ./drm_ras WAIT_ON_EVENT --device=drm:/dev/dri/card1 > waiting for error event > error event received > counter value 0 > > list all errors: > > $ ./drm_ras LIST_ERRORS --device=drm:/dev/dri/card1 > name config-id > > error-gt0-correctable-guc 0x0000000000000001 > error-gt0-correctable-slm 0x0000000000000003 > error-gt0-correctable-eu-ic 0x0000000000000004 > error-gt0-correctable-eu-grf 0x0000000000000005 > error-gt0-fatal-guc 0x0000000000000009 > error-gt0-fatal-slm 0x000000000000000d > error-gt0-fatal-eu-grf 0x000000000000000f > error-gt0-fatal-fpu 0x0000000000000010 > error-gt0-fatal-tlb 0x0000000000000011 > error-gt0-fatal-l3-fabric 0x0000000000000012 > error-gt0-correctable-subslice 0x0000000000000013 > error-gt0-correctable-l3bank 0x0000000000000014 > error-gt0-fatal-subslice 0x0000000000000015 > error-gt0-fatal-l3bank 0x0000000000000016 > error-gt0-sgunit-correctable 0x0000000000000017 > error-gt0-sgunit-nonfatal 0x0000000000000018 > error-gt0-sgunit-fatal 0x0000000000000019 > error-gt0-soc-fatal-psf-csc-0 0x000000000000001a > error-gt0-soc-fatal-psf-csc-1 0x000000000000001b > error-gt0-soc-fatal-psf-csc-2 0x000000000000001c > error-gt0-soc-fatal-punit 0x000000000000001d > error-gt0-soc-fatal-psf-0 0x000000000000001e > error-gt0-soc-fatal-psf-1 0x000000000000001f > error-gt0-soc-fatal-psf-2 0x0000000000000020 > error-gt0-soc-fatal-cd0 0x0000000000000021 > error-gt0-soc-fatal-cd0-mdfi 0x0000000000000022 > error-gt0-soc-fatal-mdfi-east 0x0000000000000023 > error-gt0-soc-fatal-mdfi-south 0x0000000000000024 > error-gt0-soc-fatal-hbm-ss0-0 0x0000000000000025 > error-gt0-soc-fatal-hbm-ss0-1 0x0000000000000026 > error-gt0-soc-fatal-hbm-ss0-2 0x0000000000000027 > error-gt0-soc-fatal-hbm-ss0-3 0x0000000000000028 > error-gt0-soc-fatal-hbm-ss0-4 0x0000000000000029 > error-gt0-soc-fatal-hbm-ss0-5 0x000000000000002a > error-gt0-soc-fatal-hbm-ss0-6 0x000000000000002b > error-gt0-soc-fatal-hbm-ss0-7 0x000000000000002c > error-gt0-soc-fatal-hbm-ss1-0 0x000000000000002d > error-gt0-soc-fatal-hbm-ss1-1 0x000000000000002e > error-gt0-soc-fatal-hbm-ss1-2 0x000000000000002f > error-gt0-soc-fatal-hbm-ss1-3 0x0000000000000030 > error-gt0-soc-fatal-hbm-ss1-4 0x0000000000000031 > error-gt0-soc-fatal-hbm-ss1-5 0x0000000000000032 > error-gt0-soc-fatal-hbm-ss1-6 0x0000000000000033 > error-gt0-soc-fatal-hbm-ss1-7 0x0000000000000034 > error-gt0-soc-fatal-hbm-ss2-0 0x0000000000000035 > error-gt0-soc-fatal-hbm-ss2-1 0x0000000000000036 > error-gt0-soc-fatal-hbm-ss2-2 0x0000000000000037 > error-gt0-soc-fatal-hbm-ss2-3 0x0000000000000038 > error-gt0-soc-fatal-hbm-ss2-4 0x0000000000000039 > error-gt0-soc-fatal-hbm-ss2-5 0x000000000000003a > error-gt0-soc-fatal-hbm-ss2-6 0x000000000000003b > error-gt0-soc-fatal-hbm-ss2-7 0x000000000000003c > error-gt0-soc-fatal-hbm-ss3-0 0x000000000000003d > error-gt0-soc-fatal-hbm-ss3-1 0x000000000000003e > error-gt0-soc-fatal-hbm-ss3-2 0x000000000000003f > error-gt0-soc-fatal-hbm-ss3-3 0x0000000000000040 > error-gt0-soc-fatal-hbm-ss3-4 0x0000000000000041 > error-gt0-soc-fatal-hbm-ss3-5 0x0000000000000042 > error-gt0-soc-fatal-hbm-ss3-6 0x0000000000000043 > error-gt0-soc-fatal-hbm-ss3-7 0x0000000000000044 > error-gt0-gsc-correctable-sram-ecc 0x0000000000000045 > error-gt0-gsc-nonfatal-mia-shutdown 0x0000000000000046 > error-gt0-gsc-nonfatal-mia-int 0x0000000000000047 > error-gt0-gsc-nonfatal-sram-ecc 0x0000000000000048 > error-gt0-gsc-nonfatal-wdg-timeout 0x0000000000000049 > error-gt0-gsc-nonfatal-rom-parity 0x000000000000004a > error-gt0-gsc-nonfatal-ucode-parity 0x000000000000004b > error-gt0-gsc-nonfatal-glitch-det 0x000000000000004c > error-gt0-gsc-nonfatal-fuse-pull 0x000000000000004d > error-gt0-gsc-nonfatal-fuse-crc-check 0x000000000000004e > error-gt0-gsc-nonfatal-selfmbist 0x000000000000004f > error-gt0-gsc-nonfatal-aon-parity 0x0000000000000050 > error-gt1-correctable-guc 0x1000000000000001 > error-gt1-correctable-slm 0x1000000000000003 > error-gt1-correctable-eu-ic 0x1000000000000004 > error-gt1-correctable-eu-grf 0x1000000000000005 > error-gt1-fatal-guc 0x1000000000000009 > error-gt1-fatal-slm 0x100000000000000d > error-gt1-fatal-eu-grf 0x100000000000000f > error-gt1-fatal-fpu 0x1000000000000010 > error-gt1-fatal-tlb 0x1000000000000011 > error-gt1-fatal-l3-fabric 0x1000000000000012 > error-gt1-correctable-subslice 0x1000000000000013 > error-gt1-correctable-l3bank 0x1000000000000014 > error-gt1-fatal-subslice 0x1000000000000015 > error-gt1-fatal-l3bank 0x1000000000000016 > error-gt1-sgunit-correctable 0x1000000000000017 > error-gt1-sgunit-nonfatal 0x1000000000000018 > error-gt1-sgunit-fatal 0x1000000000000019 > error-gt1-soc-fatal-psf-csc-0 0x100000000000001a > error-gt1-soc-fatal-psf-csc-1 0x100000000000001b > error-gt1-soc-fatal-psf-csc-2 0x100000000000001c > error-gt1-soc-fatal-punit 0x100000000000001d > error-gt1-soc-fatal-psf-0 0x100000000000001e > error-gt1-soc-fatal-psf-1 0x100000000000001f > error-gt1-soc-fatal-psf-2 0x1000000000000020 > error-gt1-soc-fatal-cd0 0x1000000000000021 > error-gt1-soc-fatal-cd0-mdfi 0x1000000000000022 > error-gt1-soc-fatal-mdfi-east 0x1000000000000023 > error-gt1-soc-fatal-mdfi-south 0x1000000000000024 > error-gt1-soc-fatal-hbm-ss0-0 0x1000000000000025 > error-gt1-soc-fatal-hbm-ss0-1 0x1000000000000026 > error-gt1-soc-fatal-hbm-ss0-2 0x1000000000000027 > error-gt1-soc-fatal-hbm-ss0-3 0x1000000000000028 > error-gt1-soc-fatal-hbm-ss0-4 0x1000000000000029 > error-gt1-soc-fatal-hbm-ss0-5 0x100000000000002a > error-gt1-soc-fatal-hbm-ss0-6 0x100000000000002b > error-gt1-soc-fatal-hbm-ss0-7 0x100000000000002c > error-gt1-soc-fatal-hbm-ss1-0 0x100000000000002d > error-gt1-soc-fatal-hbm-ss1-1 0x100000000000002e > error-gt1-soc-fatal-hbm-ss1-2 0x100000000000002f > error-gt1-soc-fatal-hbm-ss1-3 0x1000000000000030 > error-gt1-soc-fatal-hbm-ss1-4 0x1000000000000031 > error-gt1-soc-fatal-hbm-ss1-5 0x1000000000000032 > error-gt1-soc-fatal-hbm-ss1-6 0x1000000000000033 > error-gt1-soc-fatal-hbm-ss1-7 0x1000000000000034 > error-gt1-soc-fatal-hbm-ss2-0 0x1000000000000035 > error-gt1-soc-fatal-hbm-ss2-1 0x1000000000000036 > error-gt1-soc-fatal-hbm-ss2-2 0x1000000000000037 > error-gt1-soc-fatal-hbm-ss2-3 0x1000000000000038 > error-gt1-soc-fatal-hbm-ss2-4 0x1000000000000039 > error-gt1-soc-fatal-hbm-ss2-5 0x100000000000003a > error-gt1-soc-fatal-hbm-ss2-6 0x100000000000003b > error-gt1-soc-fatal-hbm-ss2-7 0x100000000000003c > error-gt1-soc-fatal-hbm-ss3-0 0x100000000000003d > error-gt1-soc-fatal-hbm-ss3-1 0x100000000000003e > error-gt1-soc-fatal-hbm-ss3-2 0x100000000000003f > error-gt1-soc-fatal-hbm-ss3-3 0x1000000000000040 > error-gt1-soc-fatal-hbm-ss3-4 0x1000000000000041 > error-gt1-soc-fatal-hbm-ss3-5 0x1000000000000042 > error-gt1-soc-fatal-hbm-ss3-6 0x1000000000000043 > error-gt1-soc-fatal-hbm-ss3-7 0x1000000000000044 > > Cc: Alex Deucher <alexander.deucher@xxxxxxx> > Cc: David Airlie <airlied@xxxxxxxxx> > Cc: Daniel Vetter <daniel@xxxxxxxx> > Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> > Cc: Oded Gabbay <ogabbay@xxxxxxxxxx> > > > Aravind Iddamsetty (5): > drm/netlink: Add netlink infrastructure > drm/xe/RAS: Register a genl netlink family > drm/xe/RAS: Expose the error counters > drm/netlink: define multicast groups > drm/xe/RAS: send multicast event on occurrence of an error > > drivers/gpu/drm/xe/Makefile | 1 + > drivers/gpu/drm/xe/xe_device.c | 3 + > drivers/gpu/drm/xe/xe_device_types.h | 2 + > drivers/gpu/drm/xe/xe_irq.c | 32 ++ > drivers/gpu/drm/xe/xe_module.c | 2 + > drivers/gpu/drm/xe/xe_netlink.c | 526 +++++++++++++++++++++++++++ > drivers/gpu/drm/xe/xe_netlink.h | 14 + > include/uapi/drm/drm_netlink.h | 81 +++++ > include/uapi/drm/xe_drm.h | 64 ++++ > 9 files changed, 725 insertions(+) > create mode 100644 drivers/gpu/drm/xe/xe_netlink.c > create mode 100644 drivers/gpu/drm/xe/xe_netlink.h > create mode 100644 include/uapi/drm/drm_netlink.h >
