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- .. SPDX-License-Identifier: GPL-2.0
- ===========================================================
- Amlogic SoC DDR Bandwidth Performance Monitoring Unit (PMU)
- ===========================================================
- The Amlogic Meson G12 SoC contains a bandwidth monitor inside DRAM controller.
- The monitor includes 4 channels. Each channel can count the request accessing
- DRAM. The channel can count up to 3 AXI port simultaneously. It can be helpful
- to show if the performance bottleneck is on DDR bandwidth.
- Currently, this driver supports the following 5 perf events:
- + meson_ddr_bw/total_rw_bytes/
- + meson_ddr_bw/chan_1_rw_bytes/
- + meson_ddr_bw/chan_2_rw_bytes/
- + meson_ddr_bw/chan_3_rw_bytes/
- + meson_ddr_bw/chan_4_rw_bytes/
- meson_ddr_bw/chan_{1,2,3,4}_rw_bytes/ events are channel-specific events.
- Each channel support filtering, which can let the channel to monitor
- individual IP module in SoC.
- Below are DDR access request event filter keywords:
- + arm - from CPU
- + vpu_read1 - from OSD + VPP read
- + gpu - from 3D GPU
- + pcie - from PCIe controller
- + hdcp - from HDCP controller
- + hevc_front - from HEVC codec front end
- + usb3_0 - from USB3.0 controller
- + hevc_back - from HEVC codec back end
- + h265enc - from HEVC encoder
- + vpu_read2 - from DI read
- + vpu_write1 - from VDIN write
- + vpu_write2 - from di write
- + vdec - from legacy codec video decoder
- + hcodec - from H264 encoder
- + ge2d - from ge2d
- + spicc1 - from SPI controller 1
- + usb0 - from USB2.0 controller 0
- + dma - from system DMA controller 1
- + arb0 - from arb0
- + sd_emmc_b - from SD eMMC b controller
- + usb1 - from USB2.0 controller 1
- + audio - from Audio module
- + sd_emmc_c - from SD eMMC c controller
- + spicc2 - from SPI controller 2
- + ethernet - from Ethernet controller
- Examples:
- + Show the total DDR bandwidth per seconds:
- .. code-block:: bash
- perf stat -a -e meson_ddr_bw/total_rw_bytes/ -I 1000 sleep 10
- + Show individual DDR bandwidth from CPU and GPU respectively, as well as
- sum of them:
- .. code-block:: bash
- perf stat -a -e meson_ddr_bw/chan_1_rw_bytes,arm=1/ -I 1000 sleep 10
- perf stat -a -e meson_ddr_bw/chan_2_rw_bytes,gpu=1/ -I 1000 sleep 10
- perf stat -a -e meson_ddr_bw/chan_3_rw_bytes,arm=1,gpu=1/ -I 1000 sleep 10
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