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Fri, 6 Sep 2019 08:26:59 +0000 Received: from DB7PR04MB4618.eurprd04.prod.outlook.com ([fe80::29e4:47d:7a2b:a6c6]) by DB7PR04MB4618.eurprd04.prod.outlook.com ([fe80::29e4:47d:7a2b:a6c6%7]) with mapi id 15.20.2220.024; Fri, 6 Sep 2019 08:26:59 +0000 From: Joakim Zhang To: "will@kernel.org" , "mark.rutland@arm.com" , "robin.murphy@arm.com" , Frank Li Subject: [PATCH 2/2] doc/perf: add DDR_CAP_AXI_ID_FILTER_ENHANCED quirk explanation Thread-Topic: [PATCH 2/2] doc/perf: add DDR_CAP_AXI_ID_FILTER_ENHANCED quirk explanation Thread-Index: AQHVZIzZEXm68GUHxUeycnF5Ux6CYg== Date: Fri, 6 Sep 2019 08:26:59 +0000 Message-ID: <20190906082356.25485-2-qiangqing.zhang@nxp.com> References: <20190906082356.25485-1-qiangqing.zhang@nxp.com> In-Reply-To: <20190906082356.25485-1-qiangqing.zhang@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.17.1 x-clientproxiedby: SG2PR04CA0129.apcprd04.prod.outlook.com (2603:1096:3:16::13) To DB7PR04MB4618.eurprd04.prod.outlook.com (2603:10a6:5:38::23) authentication-results: spf=none (sender IP is ) smtp.mailfrom=qiangqing.zhang@nxp.com; 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Signed-off-by: Joakim Zhang --- Documentation/admin-guide/perf/imx-ddr.rst | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/admin-guide/perf/imx-ddr.rst b/Documentation/admin-guide/perf/imx-ddr.rst index 45943c7325e3..0f2170974701 100644 --- a/Documentation/admin-guide/perf/imx-ddr.rst +++ b/Documentation/admin-guide/perf/imx-ddr.rst @@ -51,3 +51,10 @@ in the driver. 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 reading or writing, i.e. only can get DDR read or write requests. + You can select both DDR_CAP_AXI_ID_FILTER and DDR_CAP_AXI_ID_FILTER_ENHANCED + quirks together to get bytes of reading or writing DDR if HW supports this + enhanced filter. It is meaningful as user always care more about each master's + bandwidth.