From patchwork Tue Apr 1 18:07:01 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leo Yan X-Patchwork-Id: 14035234 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 774E2C36017 for ; Tue, 1 Apr 2025 18:10:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=Tu3FMDsHigiQn50IpxUVGSpwlAirW5ewQunvzcK1lUA=; b=mXJhDREFiAVA5xbpynIiuYxebj vMERcRzDgXdkTsd+OGelKnAGgJlmgb9TJIpl1oj1MRLwR7BTjopqDU2ta2FVkCkd+GAtca1O5524X tR/hf781KZ6HLRK9DR+9ePm2p8mtXAM0yjYx0vfjeCLxKn0c81bnuIo4u3+5sW3GyvOfdZ/xQ8mYZ feK84g2c0EO1OyzndfTZ+6XkHGArWNWD8yTMiWf9VA+hLPCY9KAtJdl0+UXJHVvKyxz19svUSsf8Z vOzhE/MW4M39HSpZAqcZw24eAKt/2ugGcp7iwae9E8zWikko8+mVQUf4uDBRkz9iDFX9M2YGw/iJs rhd8vCTg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.1 #2 (Red Hat Linux)) id 1tzg48-000000045Fq-3jp2; Tue, 01 Apr 2025 18:10:24 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98.1 #2 (Red Hat Linux)) id 1tzg18-000000044aR-2heR for linux-arm-kernel@lists.infradead.org; Tue, 01 Apr 2025 18:07:20 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 9BC3312FC; Tue, 1 Apr 2025 11:07:20 -0700 (PDT) Received: from e132581.cambridge.arm.com (e132581.arm.com [10.1.196.87]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id CF6B23F59E; Tue, 1 Apr 2025 11:07:15 -0700 (PDT) From: Leo Yan To: Suzuki K Poulose , Mike Leach , James Clark , Jonathan Corbet , Alexander Shishkin , coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Leo Yan Subject: [PATCH v4 0/7] Arm CoreSight: Support AUX pause and resume Date: Tue, 1 Apr 2025 19:07:01 +0100 Message-Id: <20250401180708.385396-1-leo.yan@arm.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250401_110718_736510_DAD87450 X-CRM114-Status: GOOD ( 11.63 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This series is to enable AUX pause and resume on Arm CoreSight. The first patch extracts the trace unit controlling operations to two functions. These two functions will be used by AUX pause and resume. Patches 02 and 03 change the ETMv4 driver to prepare callback functions for AUX pause and resume. Patch 04 changes the ETM perf layer to support AUX pause and resume in a perf session. The patch 05 re-enables sinks after buffer update, based on it, the patch 06 updates buffer on AUX pause occasion, which can mitigate the trace data lose issue. Patch 07 documents the AUX pause usages with Arm CoreSight. This patch set has been verified on the Hikey960 board. It is suggested to disable CPUIdle (add `nohlt` option in Linux command line) when verifying this series. ETM and funnel drivers are found issues during CPU suspend and resume which will be addressed separately. Changes from v3: - Re-enabled sink in buffer update callbacks (Suzuki). Changes from v2: - Rebased on CoreSight next branch. - Dropped the uAPI 'update_buf_on_pause' and updated document respectively (Suzuki). - Renamed ETM callbacks to .pause_perf() and .resume_perf() (Suzuki). - Minor improvement for error handling in the AUX resume flow. Changes from v1: - Added validation function pointers in pause and resume APIs (Mike). Leo Yan (7): coresight: etm4x: Extract the trace unit controlling coresight: Introduce pause and resume APIs for source coresight: etm4x: Hook pause and resume callbacks coresight: perf: Support AUX trace pause and resume coresight: tmc: Re-enable sink after buffer update coresight: perf: Update buffer on AUX pause Documentation: coresight: Document AUX pause and resume Documentation/trace/coresight/coresight-perf.rst | 31 +++++++++ drivers/hwtracing/coresight/coresight-core.c | 22 +++++++ drivers/hwtracing/coresight/coresight-etm-perf.c | 84 +++++++++++++++++++++++- drivers/hwtracing/coresight/coresight-etm4x-core.c | 143 +++++++++++++++++++++++++++++------------ drivers/hwtracing/coresight/coresight-etm4x.h | 2 + drivers/hwtracing/coresight/coresight-priv.h | 2 + drivers/hwtracing/coresight/coresight-tmc-etf.c | 9 +++ drivers/hwtracing/coresight/coresight-tmc-etr.c | 10 +++ include/linux/coresight.h | 4 ++ 9 files changed, 265 insertions(+), 42 deletions(-)