linux-kernel - [PATCH v6 1/2] Documentation: perf: Update documentation for ThunderX2 PMU uncore driver

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Message-ID: <1571218608-15933-2-git-send-email-gkulkarni@marvell.com>
Date:   Wed, 16 Oct 2019 09:36:59 +0000
From:   Ganapatrao Prabhakerrao 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@...nel.org" <will@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "corbet@....net" <corbet@....net>,
        "Jayachandran Chandrasekharan Nair" <jnair@...vell.com>,
        Robert Richter <rrichter@...vell.com>,
        Jan Glauber <jglauber@...vell.com>,
        "gklkml16@...il.com" <gklkml16@...il.com>
Subject: [PATCH v6 1/2] Documentation: perf: Update documentation for
 ThunderX2 PMU uncore driver

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

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

diff --git a/Documentation/admin-guide/perf/thunderx2-pmu.rst b/Documentation/admin-guide/perf/thunderx2-pmu.rst
index 08e33675853a..01f158238ae1 100644
--- a/Documentation/admin-guide/perf/thunderx2-pmu.rst
+++ b/Documentation/admin-guide/perf/thunderx2-pmu.rst
@@ -3,24 +3,26 @@ 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 and L3C support up to 4 counters, while the CCPI2 supports up to 8
+counters. Counters are independently programmable to different events and
+can be started and stopped individually. None of the counters support an
+overflow interrupt. DMC and L3C counters are 32-bit and read every 2 seconds.
+The CCPI2 counters are 64-bit and assumed not to overflow in normal operation.
 
 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