linux-kernel - [PATCH 1/2] Documentation: perf: Update documentation for ThunderX2 PMU uncore driver

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Date:   Fri, 14 Jun 2019 17:42:45 +0000
From:   Ganapatrao Kulkarni <gkulkarni@...vell.com>
To:     "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
CC:     "Will.Deacon@....com" <Will.Deacon@....com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "corbet@....net" <corbet@....net>,
        "jnair@...iumnetworks.com" <jnair@...iumnetworks.com>,
        "Robert.Richter@...ium.com" <Robert.Richter@...ium.com>,
        "Jan.Glauber@...ium.com" <Jan.Glauber@...ium.com>,
        "gklkml16@...il.com" <gklkml16@...il.com>
Subject: [PATCH 1/2] Documentation: perf: Update documentation for ThunderX2
 PMU uncore driver

From: Ganapatrao Kulkarni <ganapatrao.kulkarni@...vell.com>

Add documentation for Cavium Coherent Processor Interconnect (CCPI2) PMU.

Signed-off-by: Ganapatrao Kulkarni <gkulkarni@...vell.com>
---
 Documentation/perf/thunderx2-pmu.txt | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/Documentation/perf/thunderx2-pmu.txt b/Documentation/perf/thunderx2-pmu.txt
index dffc57143736..62243230abc3 100644
--- a/Documentation/perf/thunderx2-pmu.txt
+++ b/Documentation/perf/thunderx2-pmu.txt
@@ -2,24 +2,26 @@ Cavium ThunderX2 SoC Performance Monitoring Unit (PMU UNCORE)
 =============================================================
 
 The ThunderX2 SoC PMU consists of independent, system-wide, per-socket
-PMUs such as the Level 3 Cache (L3C) and DDR4 Memory Controller (DMC).
+PMUs such as the Level 3 Cache (L3C), DDR4 Memory Controller (DMC) and
+Cavium Coherent Processor Interconnect (CCPI2).
 
 The DMC has 8 interleaved channels and the L3C has 16 interleaved tiles.
 Events are counted for the default channel (i.e. channel 0) and prorated
 to the total number of channels/tiles.
 
-The DMC and L3C support up to 4 counters. Counters are independently
-programmable and can be started and stopped individually. Each counter
-can be set to a different event. Counters are 32-bit and do not support
-an overflow interrupt; they are read every 2 seconds.
+The DMC, L3C support up to 4 counters and CCPI2 support up to 8 counters.
+Counters are independently programmable and can be started and stopped
+individually. Each counter can be set to a different event. DMC and L3C
+Counters are 32-bit and do not support an overflow interrupt; they are read
+every 2 seconds. CCPI2 counters are 64-bit.
 
 PMU UNCORE (perf) driver:
 
 The thunderx2_pmu driver registers per-socket perf PMUs for the DMC and
-L3C devices.  Each PMU can be used to count up to 4 events
-simultaneously. The PMUs provide a description of their available events
-and configuration options under sysfs, see
-/sys/devices/uncore_<l3c_S/dmc_S/>; S is the socket id.
+L3C devices.  Each PMU can be used to count up to 4(DMC/L3C) or up to 8
+(CCPI2) events simultaneously. The PMUs provide a description of their
+available events and configuration options under sysfs, see
+/sys/devices/uncore_<l3c_S/dmc_S/ccpi2_S/>; S is the socket id.
 
 The driver does not support sampling, therefore "perf record" will not
 work. Per-task perf sessions are also not supported.
-- 
2.17.1