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Tue, 29 Oct 2019 07:06:12 +0000 Received: from DB7PR04MB4618.eurprd04.prod.outlook.com ([fe80::79f1:61a7:4076:8679]) by DB7PR04MB4618.eurprd04.prod.outlook.com ([fe80::79f1:61a7:4076:8679%3]) with mapi id 15.20.2367.031; Tue, 29 Oct 2019 07:06:12 +0000 From: Joakim Zhang To: "will@kernel.org" , "mark.rutland@arm.com" , "robin.murphy@arm.com" Subject: [PATCH V2 1/4] docs/perf: Add explanation for DDR_CAP_AXI_ID_FILTER_ENHANCED quirk Thread-Topic: [PATCH V2 1/4] docs/perf: Add explanation for DDR_CAP_AXI_ID_FILTER_ENHANCED quirk Thread-Index: AQHVjidYUN4624ydXUufacyI1IW9CQ== Date: Tue, 29 Oct 2019 07:06:12 +0000 Message-ID: <20191029070314.16719-1-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: SG2PR03CA0120.apcprd03.prod.outlook.com (2603:1096:4:91::24) 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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X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [40.107.5.44 listed in list.dnswl.org] -0.0 RCVD_IN_MSPIKE_H2 RBL: Average reputation (+2) [40.107.5.44 listed in wl.mailspike.net] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Frank Li , dl-linux-imx , "linux-arm-kernel@lists.infradead.org" , Joakim Zhang Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Add explanation for DDR_CAP_AXI_ID_FILTER_ENHANCED quirk. Signed-off-by: Joakim Zhang --- 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.