1====================================== 2HNS3 Performance Monitoring Unit (PMU) 3====================================== 4 5HNS3(HiSilicon network system 3) Performance Monitoring Unit (PMU) is an 6End Point device to collect performance statistics of HiSilicon SoC NIC. 7On Hip09, each SICL(Super I/O cluster) has one PMU device. 8 9HNS3 PMU supports collection of performance statistics such as bandwidth, 10latency, packet rate and interrupt rate. 11 12Each HNS3 PMU supports 8 hardware events. 13 14HNS3 PMU driver 15=============== 16 17The HNS3 PMU driver registers a perf PMU with the name of its sicl id.:: 18 19 /sys/bus/event_source/devices/hns3_pmu_sicl_<sicl_id> 20 21PMU driver provides description of available events, filter modes, format, 22identifier and cpumask in sysfs. 23 24The "events" directory describes the event code of all supported events 25shown in perf list. 26 27The "filtermode" directory describes the supported filter modes of each 28event. 29 30The "format" directory describes all formats of the config (events) and 31config1 (filter options) fields of the perf_event_attr structure. 32 33The "identifier" file shows version of PMU hardware device. 34 35The "bdf_min" and "bdf_max" files show the supported bdf range of each 36pmu device. 37 38The "hw_clk_freq" file shows the hardware clock frequency of each pmu 39device. 40 41Example usage of checking event code and subevent code:: 42 43 $# cat /sys/bus/event_source/devices/hns3_pmu_sicl_0/events/dly_tx_normal_to_mac_time 44 config=0x00204 45 $# cat /sys/bus/event_source/devices/hns3_pmu_sicl_0/events/dly_tx_normal_to_mac_packet_num 46 config=0x10204 47 48Each performance statistic has a pair of events to get two values to 49calculate real performance data in userspace. 50 51The bits 0~15 of config (here 0x0204) are the true hardware event code. If 52two events have same value of bits 0~15 of config, that means they are 53event pair. And the bit 16 of config indicates getting counter 0 or 54counter 1 of hardware event. 55 56After getting two values of event pair in userspace, the formula of 57computation to calculate real performance data is::: 58 59 counter 0 / counter 1 60 61Example usage of checking supported filter mode:: 62 63 $# cat /sys/bus/event_source/devices/hns3_pmu_sicl_0/filtermode/bw_ssu_rpu_byte_num 64 filter mode supported: global/port/port-tc/func/func-queue/ 65 66Example usage of perf:: 67 68 $# perf list 69 hns3_pmu_sicl_0/bw_ssu_rpu_byte_num/ [kernel PMU event] 70 hns3_pmu_sicl_0/bw_ssu_rpu_time/ [kernel PMU event] 71 ------------------------------------------ 72 73 $# perf stat -g -e hns3_pmu_sicl_0/bw_ssu_rpu_byte_num,global=1/ -e hns3_pmu_sicl_0/bw_ssu_rpu_time,global=1/ -I 1000 74 or 75 $# perf stat -g -e hns3_pmu_sicl_0/config=0x00002,global=1/ -e hns3_pmu_sicl_0/config=0x10002,global=1/ -I 1000 76 77 78Filter modes 79-------------- 80 811. global mode 82PMU collect performance statistics for all HNS3 PCIe functions of IO DIE. 83Set the "global" filter option to 1 will enable this mode. 84Example usage of perf:: 85 86 $# perf stat -a -e hns3_pmu_sicl_0/config=0x1020F,global=1/ -I 1000 87 882. port mode 89PMU collect performance statistic of one whole physical port. The port id 90is same as mac id. The "tc" filter option must be set to 0xF in this mode, 91here tc stands for traffic class. 92 93Example usage of perf:: 94 95 $# perf stat -a -e hns3_pmu_sicl_0/config=0x1020F,port=0,tc=0xF/ -I 1000 96 973. port-tc mode 98PMU collect performance statistic of one tc of physical port. The port id 99is same as mac id. The "tc" filter option must be set to 0 ~ 7 in this 100mode. 101Example usage of perf:: 102 103 $# perf stat -a -e hns3_pmu_sicl_0/config=0x1020F,port=0,tc=0/ -I 1000 104 1054. func mode 106PMU collect performance statistic of one PF/VF. The function id is BDF of 107PF/VF, its conversion formula:: 108 109 func = (bus << 8) + (device << 3) + (function) 110 111for example: 112 BDF func 113 35:00.0 0x3500 114 35:00.1 0x3501 115 35:01.0 0x3508 116 117In this mode, the "queue" filter option must be set to 0xFFFF. 118Example usage of perf:: 119 120 $# perf stat -a -e hns3_pmu_sicl_0/config=0x1020F,bdf=0x3500,queue=0xFFFF/ -I 1000 121 1225. func-queue mode 123PMU collect performance statistic of one queue of PF/VF. The function id 124is BDF of PF/VF, the "queue" filter option must be set to the exact queue 125id of function. 126Example usage of perf:: 127 128 $# perf stat -a -e hns3_pmu_sicl_0/config=0x1020F,bdf=0x3500,queue=0/ -I 1000 129 1306. func-intr mode 131PMU collect performance statistic of one interrupt of PF/VF. The function 132id is BDF of PF/VF, the "intr" filter option must be set to the exact 133interrupt id of function. 134Example usage of perf:: 135 136 $# perf stat -a -e hns3_pmu_sicl_0/config=0x00301,bdf=0x3500,intr=0/ -I 1000 137