NAME

pmc.dmc-620 — measure the Arm DMC-620 Dynamic Memory Controller performance counter events.

LIBRARY

Performance Counters Library (libpmc, -lpmc)

SYNOPSIS

#include <pmc.h>

DESCRIPTION

DMC-620 PMU counters may be configured to count any one of a defined set of hardware events.

Arm CoreLink DMC-620 Dynamic Memory Controller performance counters are documented in Revision: r0p0, ARM CoreLink DMC-620 Dynamic Memory Controller Technical Reference Manual, ARM Limited, 2017.

PMC Capabilities

DMC-620 PMU counters support the following capabilities:

Capability	Support
PMC_CAP_CASCADE	No
PMC_CAP_EDGE	No
PMC_CAP_INTERRUPT	Yes
PMC_CAP_INVERT	Yes
PMC_CAP_READ	Yes
PMC_CAP_PRECISE	No
PMC_CAP_SYSTEM	Yes
PMC_CAP_TAGGING	No
PMC_CAP_THRESHOLD	Yes
PMC_CAP_USER	No
PMC_CAP_WRITE	Yes

Event Qualifiers

Event specifiers for these PMCs support the following common qualifiers:

inc=value: Two-bit value that controls direction of count for PMC. Behavior depend on selected event.
inv: Invert the sense of comparison.
match=value: Count only events matched by value.
mask=qualifier: Allow to apply qualifier mask to compared value.

Class Name Prefix

These PMCs use a class name prefix of “DMC620_CD2_” or “DMC620_C_”.

Event Specifiers

The following PMC events are available:

clkdiv2_cycle_count

clkdiv2_allocate

clkdiv2_queue_depth

clkdiv2_waiting_for_wr_data

clkdiv2_read_backlog

clkdiv2_waiting_for_mi

clkdiv2_hazard_resolution

clkdiv2_enqueue

clkdiv2_arbitrate

clkdiv2_lrank_turnaround_activate

clkdiv2_prank_turnaround_activate

clkdiv2_read_depth

clkdiv2_write_depth

clkdiv2_highhigh_qos_depth

clkdiv2_high_qos_depth

clkdiv2_medium_qos_depth

clkdiv2_low_qos_depth

clkdiv2_activate

clkdiv2_rdwr

clkdiv2_refresh

clkdiv2_training_request

clkdiv2_t_mac_tracker

clkdiv2_bk_fsm_tracker

clkdiv2_bk_open_tracker

clkdiv2_ranks_in_pwr_down

clkdiv2_ranks_in_sref

clk_cycle_count

clk_request

clk_upload_stall

HISTORY

The pmc library first appeared in FreeBSD 6.0.
The pmc.dmc-620 driver was added in FreeBSD 14.0.

AUTHORS

The Performance Counters Library (libpmc, -lpmc) library was written by Joseph Koshy <jkoshy@FreeBSD.org>. Oleksandr Rybalko <ray@FreeBSD.org>.
The DMC-620 PMU driver was sponsored by Ampere Computing LLC. This manual page was written by Oleksandr Rybalko <ray@FreeBSD.org>.