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1.. SPDX-License-Identifier: GPL-2.02 3===========================================================4Amlogic SoC DDR Bandwidth Performance Monitoring Unit (PMU)5===========================================================6 7The Amlogic Meson G12 SoC contains a bandwidth monitor inside DRAM controller.8The monitor includes 4 channels. Each channel can count the request accessing9DRAM. The channel can count up to 3 AXI port simultaneously. It can be helpful10to show if the performance bottleneck is on DDR bandwidth.11 12Currently, this driver supports the following 5 perf events:13 14+ meson_ddr_bw/total_rw_bytes/15+ meson_ddr_bw/chan_1_rw_bytes/16+ meson_ddr_bw/chan_2_rw_bytes/17+ meson_ddr_bw/chan_3_rw_bytes/18+ meson_ddr_bw/chan_4_rw_bytes/19 20meson_ddr_bw/chan_{1,2,3,4}_rw_bytes/ events are channel-specific events.21Each channel support filtering, which can let the channel to monitor22individual IP module in SoC.23 24Below are DDR access request event filter keywords:25 26+ arm - from CPU27+ vpu_read1 - from OSD + VPP read28+ gpu - from 3D GPU29+ pcie - from PCIe controller30+ hdcp - from HDCP controller31+ hevc_front - from HEVC codec front end32+ usb3_0 - from USB3.0 controller33+ hevc_back - from HEVC codec back end34+ h265enc - from HEVC encoder35+ vpu_read2 - from DI read36+ vpu_write1 - from VDIN write37+ vpu_write2 - from di write38+ vdec - from legacy codec video decoder39+ hcodec - from H264 encoder40+ ge2d - from ge2d41+ spicc1 - from SPI controller 142+ usb0 - from USB2.0 controller 043+ dma - from system DMA controller 144+ arb0 - from arb045+ sd_emmc_b - from SD eMMC b controller46+ usb1 - from USB2.0 controller 147+ audio - from Audio module48+ sd_emmc_c - from SD eMMC c controller49+ spicc2 - from SPI controller 250+ ethernet - from Ethernet controller51 52 53Examples:54 55 + Show the total DDR bandwidth per seconds:56 57 .. code-block:: bash58 59 perf stat -a -e meson_ddr_bw/total_rw_bytes/ -I 1000 sleep 1060 61 62 + Show individual DDR bandwidth from CPU and GPU respectively, as well as63 sum of them:64 65 .. code-block:: bash66 67 perf stat -a -e meson_ddr_bw/chan_1_rw_bytes,arm=1/ -I 1000 sleep 1068 perf stat -a -e meson_ddr_bw/chan_2_rw_bytes,gpu=1/ -I 1000 sleep 1069 perf stat -a -e meson_ddr_bw/chan_3_rw_bytes,arm=1,gpu=1/ -I 1000 sleep 1070 71