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Fri, 1 Nov 2019 08:36:10 +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; Fri, 1 Nov 2019 08:36:10 +0000 From: Joakim Zhang To: "will@kernel.org" , "mark.rutland@arm.com" , "robin.murphy@arm.com" Subject: [PATCH V3 1/4] docs/perf: Add explanation for DDR_CAP_AXI_ID_FILTER_ENHANCED quirk Thread-Topic: [PATCH V3 1/4] docs/perf: Add explanation for DDR_CAP_AXI_ID_FILTER_ENHANCED quirk Thread-Index: AQHVkI9p4K7tGFD97Ee5sgRPKHNZiQ== Date: Fri, 1 Nov 2019 08:36:10 +0000 Message-ID: <20191101083317.29510-1-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: SG2PR04CA0156.apcprd04.prod.outlook.com (2603:1096:4::18) 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 [40.107.1.85 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from 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. V2->V3: * only need select this enhanced quirk if HW supports. --- Documentation/admin-guide/perf/imx-ddr.rst | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/admin-guide/perf/imx-ddr.rst b/Documentation/admin-guide/perf/imx-ddr.rst index 517a205abad6..d1347928ac39 100644 --- a/Documentation/admin-guide/perf/imx-ddr.rst +++ b/Documentation/admin-guide/perf/imx-ddr.rst @@ -50,3 +50,11 @@ 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 + can select DDR_CAP_AXI_ID_FILTER_ENHANCED quirk if HW supports enhanced filter. + Enhanced filter means that it can count bursts and bytes from DDR transaction + at the same time as it implements another set of data counters. DDR PMU driver + always return bytes for enhanced filter due to it is more meaningful for users.