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[50.116.44.211]) by smtp.gmail.com with ESMTPSA id f67sm5267299qtb.68.2019.05.28.01.08.58 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 28 May 2019 01:09:03 -0700 (PDT) Date: Tue, 28 May 2019 16:08:53 +0800 From: Leo Yan To: Suzuki K Poulose Subject: Re: [PATCH v4 00/30] coresight: Support for ACPI bindings Message-ID: <20190528080853.GB5753@leoy-ThinkPad-X240s> References: <1558521304-27469-1-git-send-email-suzuki.poulose@arm.com> <20190528051924.GA19112@leoy-ThinkPad-X240s> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190528051924.GA19112@leoy-ThinkPad-X240s> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190528_010906_867570_8D134B88 X-CRM114-Status: GOOD ( 13.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: coresight@lists.linaro.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Suzuki, Mathieu, On Tue, May 28, 2019 at 01:19:24PM +0800, Leo Yan wrote: [...] > After I applied this patch set, I found all device names under > '/sys/bus/event_source/devices/cs_etm/sinks/' have been changed as > below on my DB410c board: > # ls /sys/bus/event_source/devices/cs_etm/sinks/ > tmc_etf0 tmc_etr0 tpiu0 > > This leads to below command failure when open PMU device: > # perf record -e cs_etm/@826000.etr/ --per-thread uname > failed to set sink "826000.etr" on event cs_etm/@826000.etr/ with 2 (No such file or directory) > > I must use below command so that perf can match string with the > device name under '/sys/bus/event_source/devices/cs_etm/sinks/': > # perf record -e cs_etm/@tmc_etr0/ --per-thread uname > > Seems to me, this is an unexpected change and when I worked on the > patch set v2, IIRC that version still can use '826000.etr' to open PMU > device. > > Please help confirm for this. Thanks! Finally, this is narrowed down to the patch 09/30 'coresight: Use coresight device names for sinks in PMU attribute', so this is delibrately to change to use new name format for perf command; if so, maybe also update the documentation to reflect this change? Thanks, Leo Yan _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel