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[68.147.8.254]) by smtp.gmail.com with ESMTPSA id t64sm47261961pfa.86.2019.04.25.12.53.44 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 25 Apr 2019 12:53:45 -0700 (PDT) From: Mathieu Poirier To: gregkh@linuxfoundation.org Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 26/32] coresight: tmc-etr: Introduce the notion of process ID to ETR devices Date: Thu, 25 Apr 2019 13:53:04 -0600 Message-Id: <20190425195310.31562-27-mathieu.poirier@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190425195310.31562-1-mathieu.poirier@linaro.org> References: <20190425195310.31562-1-mathieu.poirier@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In preparation to support CPU-wide trace scenarios, introduce the notion of process ID to ETR devices. That way events monitoring the same process can use the same etr_buf, allowing multiple CPUs to use the same sink. Signed-off-by: Mathieu Poirier Tested-by: Leo Yan Tested-by: Robert Walker --- drivers/hwtracing/coresight/coresight-tmc-etr.c | 4 ++++ 1 file changed, 4 insertions(+) -- 2.17.1 diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index bca1b2d9ef2e..1acad42184e6 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include "coresight-catu.h" #include "coresight-etm-perf.h" @@ -25,6 +26,7 @@ struct etr_flat_buf { /* * etr_perf_buffer - Perf buffer used for ETR * @etr_buf - Actual buffer used by the ETR + * @pid - The PID this etr_perf_buffer belongs to. * @snaphost - Perf session mode * @head - handle->head at the beginning of the session. * @nr_pages - Number of pages in the ring buffer. @@ -32,6 +34,7 @@ struct etr_flat_buf { */ struct etr_perf_buffer { struct etr_buf *etr_buf; + pid_t pid; bool snapshot; unsigned long head; int nr_pages; @@ -1277,6 +1280,7 @@ static void *tmc_alloc_etr_buffer(struct coresight_device *csdev, return NULL; } + etr_perf->pid = task_pid_nr(event->owner); etr_perf->snapshot = snapshot; etr_perf->nr_pages = nr_pages; etr_perf->pages = pages;