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Thu, 13 Aug 2020 10:57:09 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id B5F7CC433A1; Thu, 13 Aug 2020 10:57:08 +0000 (UTC) Received: from codeaurora.org (unknown [180.166.53.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: tingwei) by smtp.codeaurora.org (Postfix) with ESMTPSA id 9B84CC433C9; Thu, 13 Aug 2020 10:57:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 9B84CC433C9 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=tingweiz@codeaurora.org Date: Thu, 13 Aug 2020 18:56:55 +0800 From: Tingwei Zhang To: Suzuki K Poulose Subject: Re: [PATCH v8 09/24] coresight: etm3x: allow etm3x to be built as a module Message-ID: <20200813105654.GA6742@codeaurora.org> References: <20200807111153.7784-1-tingwei@codeaurora.org> <20200807111153.7784-10-tingwei@codeaurora.org> <375f5a93-aa4e-14c0-33d6-af4894375986@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <375f5a93-aa4e-14c0-33d6-af4894375986@arm.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200813_065725_761734_07205543 X-CRM114-Status: GOOD ( 27.36 ) 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: tsoni@codeaurora.org, saiprakash.ranjan@codeaurora.org, kim.phillips@arm.com, mathieu.poirier@linaro.org, alexander.shishkin@linux.intel.com, gregkh@linuxfoundation.org, coresight@lists.linaro.org, rdunlap@infradead.org, ykaukab@suse.de, linux@armlinux.org.uk, jinlmao@codeaurora.org, tingwei@codeaurora.org, leo.yan@linaro.org, linux-arm-kernel@lists.infradead.org, mike.leach@linaro.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Aug 13, 2020 at 05:47:22PM +0800, Suzuki K Poulose wrote: > On 08/07/2020 12:11 PM, Tingwei Zhang wrote: > >From: Kim Phillips > > > >Allow to build coresight-etm3x as a module, for ease of development. > > > >- Kconfig becomes a tristate, to allow =m > >- append -core to source file name to allow module to > > be called coresight-etm3x by the Makefile > >- add an etm_remove function, for module unload > >- add a MODULE_DEVICE_TABLE for autoloading on boot > > > >Cc: Mathieu Poirier > >Cc: Leo Yan > >Cc: Alexander Shishkin > >Cc: Randy Dunlap > >Cc: Suzuki K Poulose > >Cc: Greg Kroah-Hartman > >Cc: Russell King > >Signed-off-by: Kim Phillips > >Signed-off-by: Tingwei Zhang > >Reviewed-by: Mike Leach > >--- > > drivers/hwtracing/coresight/Kconfig | 5 +++- > > drivers/hwtracing/coresight/Makefile | 3 ++- > > ...resight-etm3x.c => coresight-etm3x-core.c} | 27 ++++++++++++++++++- > > 3 files changed, 32 insertions(+), 3 deletions(-) > > rename drivers/hwtracing/coresight/{coresight-etm3x.c => > >coresight-etm3x-core.c} (97%) > > > >diff --git a/drivers/hwtracing/coresight/Kconfig > >b/drivers/hwtracing/coresight/Kconfig > >index 6433f835fc97..8fd9fd139cf3 100644 > >--- a/drivers/hwtracing/coresight/Kconfig > >+++ b/drivers/hwtracing/coresight/Kconfig > >@@ -65,7 +65,7 @@ config CORESIGHT_SINK_ETBV10 > > special enhancement or added features. > > > > config CORESIGHT_SOURCE_ETM3X > >- bool "CoreSight Embedded Trace Macrocell 3.x driver" > >+ tristate "CoreSight Embedded Trace Macrocell 3.x driver" > > depends on !ARM64 > > select CORESIGHT_LINKS_AND_SINKS > > help > >@@ -74,6 +74,9 @@ config CORESIGHT_SOURCE_ETM3X > > This is primarily useful for instruction level tracing. Depending > > the ETM version data tracing may also be available. > > > >+ To compile this driver as a module, choose M here: the > >+ module will be called coresight-etm3x. > >+ > > config CORESIGHT_SOURCE_ETM4X > > bool "CoreSight Embedded Trace Macrocell 4.x driver" > > depends on ARM64 > >diff --git a/drivers/hwtracing/coresight/Makefile > >b/drivers/hwtracing/coresight/Makefile > >index 19497d1d92bf..d619cfd0abd8 100644 > >--- a/drivers/hwtracing/coresight/Makefile > >+++ b/drivers/hwtracing/coresight/Makefile > >@@ -11,7 +11,8 @@ obj-$(CONFIG_CORESIGHT_SINK_TPIU) += coresight-tpiu.o > > obj-$(CONFIG_CORESIGHT_SINK_ETBV10) += coresight-etb10.o > > obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-funnel.o \ > > coresight-replicator.o > >-obj-$(CONFIG_CORESIGHT_SOURCE_ETM3X) += coresight-etm3x.o > >coresight-etm-cp14.o \ > >+obj-$(CONFIG_CORESIGHT_SOURCE_ETM3X) += coresight-etm3x.o > >+coresight-etm3x-y := coresight-etm3x-core.o coresight-etm-cp14.o \ > > coresight-etm3x-sysfs.o > > obj-$(CONFIG_CORESIGHT_SOURCE_ETM4X) += coresight-etm4x.o \ > > coresight-etm4x-sysfs.o > >diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c > >b/drivers/hwtracing/coresight/coresight-etm3x-core.c > >similarity index 97% > >rename from drivers/hwtracing/coresight/coresight-etm3x.c > >rename to drivers/hwtracing/coresight/coresight-etm3x-core.c > >index bf22dcfd3327..82b333c40006 100644 > >--- a/drivers/hwtracing/coresight/coresight-etm3x.c > >+++ b/drivers/hwtracing/coresight/coresight-etm3x-core.c > >@@ -895,6 +895,23 @@ static int etm_probe(struct amba_device *adev, const > >struct amba_id *id) > > return ret; > > } > > > >+static int __exit etm_remove(struct amba_device *adev) > >+{ > >+ struct etm_drvdata *drvdata = dev_get_drvdata(&adev->dev); > >+ > >+ etm_perf_symlink(drvdata->csdev, false); > >+ > >+ if (--etm_count == 0) { > >+ cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING); > >+ if (hp_online) > >+ cpuhp_remove_state_nocalls(hp_online); > >+ } > >+ > > As mentioned in the previous version, this needs fixing > similar to the etm4x to avoid races with etm_count. I understand > that it is an exisiting problem. But this set exposes it more > due to etm_remove() calls and is much more probable to hit it. > OK. I'll fix this. Can you help to review ETM4 fix? If that's fine, I'll make similar fix here. Unfortunately, I don't have any device with ETM3. Can anyone help to verify the function on ETM3? I'll really appreciate that. Thanks, Tingwei > > Suzuki _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel