en Copyright 2015 Java http://172.16.0.5:8080/history/linux-6.15/Documentation/ABI/testing/debugfs-driver-qat_telemetry#eb527077 crypto: qat - add support for ring pair level telemetryExpose through debugfs ring pair telemetry data for QAT GEN4 devices.This allows to gather metrics about the PCIe channel and device TLB fora selected ring pair. It is possible to monitor maximum 4 ring pairs atthe time per device.For details, refer to debugfs-driver-qat_telemetry in Documentation/ABI.This patch is based on earlier work done by Wojciech Ziemba.Signed-off-by: Lucas Segarra Fernandez <lucas.segarra.fernandez@intel.com>Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>Reviewed-by: Damian Muszynski <damian.muszynski@intel.com>Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> List of files: /linux-6.15/Documentation/ABI/testing/debugfs-driver-qat_telemetry Fri, 22 Dec 2023 10:35:08 +0000 Lucas Segarra Fernandez <lucas.segarra.fernandez@intel.com> http://172.16.0.5:8080/history/linux-6.15/Documentation/ABI/testing/debugfs-driver-qat_telemetry#69e7649f crypto: qat - add support for device telemetryExpose through debugfs device telemetry data for QAT GEN4 devices.This allows to gather metrics about the performance and the utilizationof a device. In particular, statistics on (1) the utilization of thePCIe channel, (2) address translation, when SVA is enabled and (3) theinternal engines for crypto and data compression.If telemetry is supported by the firmware, the driver allocates a DMAregion and a circular buffer. When telemetry is enabled, through the`control` attribute in debugfs, the driver sends to the firmware, viathe admin interface, the `TL_START` command. This triggers the device toperiodically gather telemetry data from hardware registers and write itinto the DMA memory region. The device writes into the shared regionevery second.The driver, every 500ms, snapshots the DMA shared region into thecircular buffer. This is then used to compute basic metric(min/max/average) on each counter, every time the `device_data` attributeis queried.Telemetry counters are exposed through debugfs in the folder/sys/kernel/debug/qat_<device>_<BDF>/telemetry.For details, refer to debugfs-driver-qat_telemetry in Documentation/ABI.This patch is based on earlier work done by Wojciech Ziemba.Signed-off-by: Lucas Segarra Fernandez <lucas.segarra.fernandez@intel.com>Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>Reviewed-by: Damian Muszynski <damian.muszynski@intel.com>Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> List of files: /linux-6.15/Documentation/ABI/testing/debugfs-driver-qat_telemetry Fri, 22 Dec 2023 10:35:07 +0000 Lucas Segarra Fernandez <lucas.segarra.fernandez@intel.com>