From: Joakim Zhang <qiangqing.zhang@nxp.com>
To: "will@kernel.org" <will@kernel.org>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
"robin.murphy@arm.com" <robin.murphy@arm.com>
Cc: Frank Li <frank.li@nxp.com>, dl-linux-imx <linux-imx@nxp.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Joakim Zhang <qiangqing.zhang@nxp.com>
Subject: [PATCH V2 1/4] docs/perf: Add explanation for DDR_CAP_AXI_ID_FILTER_ENHANCED quirk
Date: Tue, 29 Oct 2019 07:06:12 +0000 [thread overview]
Message-ID: <20191029070314.16719-1-qiangqing.zhang@nxp.com> (raw)
Add explanation for DDR_CAP_AXI_ID_FILTER_ENHANCED quirk.
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
---
ChangeLog:
V1->V2:
* improve the context a bit.
---
Documentation/admin-guide/perf/imx-ddr.rst | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/Documentation/admin-guide/perf/imx-ddr.rst b/Documentation/admin-guide/perf/imx-ddr.rst
index 517a205abad6..b971df3117ba 100644
--- a/Documentation/admin-guide/perf/imx-ddr.rst
+++ b/Documentation/admin-guide/perf/imx-ddr.rst
@@ -50,3 +50,12 @@ in the driver.
axi_id to monitor a specific id, rather than having to specify axi_mask.
e.g.::
perf stat -a -e imx8_ddr0/axid-read,axi_id=0x12/ cmd, which will monitor ARID=0x12
+
+* With DDR_CAP_AXI_ID_FILTER_ENHANCED quirk.
+ This is the extension of DDR_CAP_AXI_ID_FILTER quirk which is only support getting
+ bursts from DDR transaction, i.e. only can get DDR read or write requests. You
+ need select both DDR_CAP_AXI_ID_FILTER and DDR_CAP_AXI_ID_FILTER_ENHANCED quirks
+ together if HW supports enhanced filter. Enhanced filter means that it can count
+ bursts and bytes from DDR transaction at the same time as it implement another
+ set of data counters. DDR PMU driver always return bytes for enhanced filter as
+ it is more meaningful for users.
--
2.17.1
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next reply other threads:[~2019-10-29 7:06 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-29 7:06 Joakim Zhang [this message]
2019-10-29 7:06 ` [PATCH V2 2/4] bindings: perf: imx-ddr: Add new compatible string Joakim Zhang
2019-10-29 7:06 ` [PATCH V2 3/4] perf/imx_ddr: Add enhanced AXI ID filter support Joakim Zhang
2019-10-31 15:38 ` Will Deacon
2019-11-01 8:21 ` Joakim Zhang
2019-10-29 7:06 ` [PATCH V2 4/4] perf/imx_ddr: Add driver for DDR PMU in i.MX8MPlus Joakim Zhang
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