===================================================================
Marvell Odyssey DDR PMU Performance Monitoring Unit (PMU UNCORE)
===================================================================

Odyssey DRAM Subsystem supports eight counters for monitoring performance
and software can program those counters to monitor any of the defined
performance events. Supported performance events include those counted
at the interface between the DDR controller and the PHY, interface between
the DDR Controller and the CHI interconnect, or within the DDR Controller.

Additionally DSS also supports two fixed performance event counters, one
for ddr reads and the other for ddr writes.

The counter will be operating in either manual or auto mode.

The PMU driver exposes the available events and format options under sysfs::

        /sys/bus/event_source/devices/mrvl_ddr_pmu_<>/events/
        /sys/bus/event_source/devices/mrvl_ddr_pmu_<>/format/

Examples::

        $ perf list | grep ddr
        mrvl_ddr_pmu_<>/ddr_act_bypass_access/   [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_bsm_alloc/           [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_bsm_starvation/      [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_cam_active_access/   [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_cam_mwr/             [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_cam_rd_active_access/ [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_cam_rd_or_wr_access/ [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_cam_read/            [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_cam_wr_access/       [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_cam_write/           [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_capar_error/         [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_crit_ref/            [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_ddr_reads/           [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_ddr_writes/          [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_dfi_cmd_is_retry/    [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_dfi_cycles/          [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_dfi_parity_poison/   [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_dfi_rd_data_access/  [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_dfi_wr_data_access/  [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_dqsosc_mpc/          [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_dqsosc_mrr/          [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_enter_mpsm/          [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_enter_powerdown/     [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_enter_selfref/       [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_hif_pri_rdaccess/    [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_hif_rd_access/       [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_hif_rd_or_wr_access/ [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_hif_rmw_access/      [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_hif_wr_access/       [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_hpri_sched_rd_crit_access/ [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_load_mode/           [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_lpri_sched_rd_crit_access/ [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_precharge/           [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_precharge_for_other/ [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_precharge_for_rdwr/  [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_raw_hazard/          [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_rd_bypass_access/    [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_rd_crc_error/        [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_rd_uc_ecc_error/     [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_rdwr_transitions/    [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_refresh/             [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_retry_fifo_full/     [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_spec_ref/            [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_tcr_mrr/             [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_war_hazard/          [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_waw_hazard/          [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_win_limit_reached_rd/ [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_win_limit_reached_wr/ [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_wr_crc_error/        [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_wr_trxn_crit_access/ [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_write_combine/       [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_zqcl/                [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_zqlatch/             [Kernel PMU event]
        mrvl_ddr_pmu_<>/ddr_zqstart/             [Kernel PMU event]

        $ perf stat -e ddr_cam_read,ddr_cam_write,ddr_cam_active_access,ddr_cam
          rd_or_wr_access,ddr_cam_rd_active_access,ddr_cam_mwr <workload>