.\" Copyright (c) 2022 Ampere Computing.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd Jul 22, 2022
.Dt PMC.DMC-620 3
.Os
.Sh NAME
.Nm pmc.dmc-620
.Nd measure the
.Tn Arm
.Tn DMC-620
Dynamic Memory Controller performance counter events.
.Sh LIBRARY
.Lb libpmc
.Sh SYNOPSIS
.In pmc.h
.Sh DESCRIPTION
.Tn DMC-620
PMU counters may be configured to count any one of a defined set of hardware
events.
.Pp
.Tn Arm
.Tn CoreLink
.Tn DMC-620 Dynamic Memory Controller performance counters are documented in
.Rs
.%B "ARM CoreLink DMC-620 Dynamic Memory Controller Technical Reference Manual"
.%T "Revision: r0p0"
.%D 2017
.%Q "ARM Limited"
.Re
.Ss PMC Capabilities
.Tn DMC-620
PMU counters support the following capabilities:
.Bl -column "PMC_CAP_INTERRUPT" "Support"
.It Sy Capability Ta Em Support
.It PMC_CAP_CASCADE Ta \&No
.It PMC_CAP_EDGE Ta \&No
.It PMC_CAP_INTERRUPT Ta Yes
.It PMC_CAP_INVERT Ta Yes
.It PMC_CAP_READ Ta Yes
.It PMC_CAP_PRECISE Ta \&No
.It PMC_CAP_SYSTEM Ta Yes
.It PMC_CAP_TAGGING Ta \&No
.It PMC_CAP_THRESHOLD Ta Yes
.It PMC_CAP_USER Ta \&No
.It PMC_CAP_WRITE Ta Yes
.El
.Ss Event Qualifiers
Event specifiers for these PMCs support the following common
qualifiers:
.Bl -tag -width indent
.It Li inc= Ns Ar value
Two-bit value that controls direction of count for PMC.
Behavior depend on selected event.
.It Li inv
Invert the sense of comparison.
.It Li match= Ns Ar value
Count only events matched by
.Ar value.
.It Li mask= Ns Ar qualifier
Allow to apply
.Ar qualifier
mask to compared
.Ar value .
.El
.Ss Class Name Prefix
These PMCs use a class name prefix of
.Dq Li DMC620_CD2_
or
.Dq Li DMC620_C_ .
.Ss Event Specifiers
The following PMC events are available:
.Bl -column
.It Sy clkdiv2_cycle_count
.It Sy clkdiv2_allocate
.It Sy clkdiv2_queue_depth
.It Sy clkdiv2_waiting_for_wr_data
.It Sy clkdiv2_read_backlog
.It Sy clkdiv2_waiting_for_mi
.It Sy clkdiv2_hazard_resolution
.It Sy clkdiv2_enqueue
.It Sy clkdiv2_arbitrate
.It Sy clkdiv2_lrank_turnaround_activate
.It Sy clkdiv2_prank_turnaround_activate
.It Sy clkdiv2_read_depth
.It Sy clkdiv2_write_depth
.It Sy clkdiv2_highhigh_qos_depth
.It Sy clkdiv2_high_qos_depth
.It Sy clkdiv2_medium_qos_depth
.It Sy clkdiv2_low_qos_depth
.It Sy clkdiv2_activate
.It Sy clkdiv2_rdwr
.It Sy clkdiv2_refresh
.It Sy clkdiv2_training_request
.It Sy clkdiv2_t_mac_tracker
.It Sy clkdiv2_bk_fsm_tracker
.It Sy clkdiv2_bk_open_tracker
.It Sy clkdiv2_ranks_in_pwr_down
.It Sy clkdiv2_ranks_in_sref
.It Sy clk_cycle_count
.It Sy clk_request
.It Sy clk_upload_stall
.El
.Sh SEE ALSO
.Xr pmc 3 ,
.Xr pmc.amd 3 ,
.Xr pmc.atom 3 ,
.Xr pmc.core 3 ,
.Xr pmc.core2 3 ,
.Xr pmc.corei7 3 ,
.Xr pmc.corei7uc 3 ,
.Xr pmc.iaf 3 ,
.Xr pmc.soft 3 ,
.Xr pmc.tsc 3 ,
.Xr pmc.westmere 3 ,
.Xr pmc.westmereuc 3 ,
.Xr pmc_cpuinfo 3 ,
.Xr pmclog 3 ,
.Xr hwpmc 4
.Sh HISTORY
The
.Nm pmc
library first appeared in
.Fx 6.0 .
.br
The
.Nm pmc.dmc-620
driver was added in
.Fx 14.0 .
.Sh AUTHORS
.An -nosplit
The
.Lb libpmc
library was written by
.An Joseph Koshy Aq Mt jkoshy@FreeBSD.org .
.An Oleksandr Rybalko Aq Mt ray@FreeBSD.org .
.br
The DMC-620 PMU driver was sponsored by Ampere Computing LLC.
This manual page was written by
.An Oleksandr Rybalko Aq Mt ray@FreeBSD.org .