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[68.147.8.254]) by smtp.gmail.com with ESMTPSA id s24sm11965176pgv.55.2020.09.15.11.09.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Sep 2020 11:09:20 -0700 (PDT) Date: Tue, 15 Sep 2020 12:09:18 -0600 From: Mathieu Poirier To: Tingwei Zhang Subject: Re: [PATCH v11 09/24] coresight: etm3x: allow etm3x to be built as a module Message-ID: <20200915180918.GA3665622@xps15> References: <20200915104116.16789-1-tingwei@codeaurora.org> <20200915104116.16789-10-tingwei@codeaurora.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200915104116.16789-10-tingwei@codeaurora.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200915_140923_385123_28D9C437 X-CRM114-Status: GOOD ( 34.99 ) 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, Sai Prakash Ranjan , Kim Phillips , Mao Jinlong , Suzuki K Poulose , Alexander Shishkin , Greg Kroah-Hartman , coresight@lists.linaro.org, Randy Dunlap , Mian Yousaf Kaukab , Russell King , linux-kernel@vger.kernel.org, Leo Yan , linux-arm-kernel@lists.infradead.org, Mike Leach 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 Tue, Sep 15, 2020 at 06:41:01PM +0800, 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 > - delay advertising the per-cpu etmdrvdata > - protect etmdrvdata[] by modifying it on relevant CPU > > 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 | 5 +- > ...resight-etm3x.c => coresight-etm3x-core.c} | 148 ++++++++++++++---- > 3 files changed, 122 insertions(+), 36 deletions(-) > rename drivers/hwtracing/coresight/{coresight-etm3x.c => coresight-etm3x-core.c} (90%) > > 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..86b4648844b4 100644 > --- a/drivers/hwtracing/coresight/Makefile > +++ b/drivers/hwtracing/coresight/Makefile > @@ -11,8 +11,9 @@ 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 \ > - coresight-etm3x-sysfs.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 > obj-$(CONFIG_CORESIGHT_STM) += coresight-stm.o > diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x-core.c > similarity index 90% > rename from drivers/hwtracing/coresight/coresight-etm3x.c > rename to drivers/hwtracing/coresight/coresight-etm3x-core.c > index bf22dcfd3327..56eba0b5c71f 100644 > --- a/drivers/hwtracing/coresight/coresight-etm3x.c > +++ b/drivers/hwtracing/coresight/coresight-etm3x-core.c > @@ -782,6 +782,42 @@ static void etm_init_trace_id(struct etm_drvdata *drvdata) > drvdata->traceid = coresight_get_trace_id(drvdata->cpu); > } > > +static int __init etm_hp_setup(void) > +{ > + int ret; > + > + ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ARM_CORESIGHT_STARTING, > + "arm/coresight:starting", > + etm_starting_cpu, etm_dying_cpu); Indentation problem. > + > + if (ret) > + return ret; > + > + ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN, > + "arm/coresight:online", > + etm_online_cpu, NULL); > + > + /* HP dyn state ID returned in ret on success */ > + if (ret > 0) { > + hp_online = ret; > + return 0; > + } > + > + /* failed dyn state - remove others */ > + cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING); > + > + return ret; > +} > + > +static void etm_hp_clear(void) > +{ > + cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING); > + if (hp_online) { > + cpuhp_remove_state_nocalls(hp_online); > + hp_online = 0; > + } > +} > + > static int etm_probe(struct amba_device *adev, const struct amba_id *id) > { > int ret; > @@ -824,38 +860,23 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id) > return -ENOMEM; > > cpus_read_lock(); Locking is no longer needed. > - etmdrvdata[drvdata->cpu] = drvdata; > > if (smp_call_function_single(drvdata->cpu, > etm_init_arch_data, drvdata, 1)) > dev_err(dev, "ETM arch init failed\n"); > > - if (!etm_count++) { > - cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ARM_CORESIGHT_STARTING, > - "arm/coresight:starting", > - etm_starting_cpu, etm_dying_cpu); > - ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN, > - "arm/coresight:online", > - etm_online_cpu, NULL); > - if (ret < 0) > - goto err_arch_supported; > - hp_online = ret; > - } > cpus_read_unlock(); > > - if (etm_arch_supported(drvdata->arch) == false) { > - ret = -EINVAL; > - goto err_arch_supported; > - } > + if (etm_arch_supported(drvdata->arch) == false) > + return -EINVAL; > > etm_init_trace_id(drvdata); > etm_set_default(&drvdata->config); > > pdata = coresight_get_platform_data(dev); > - if (IS_ERR(pdata)) { > - ret = PTR_ERR(pdata); > - goto err_arch_supported; > - } > + if (IS_ERR(pdata)) > + return PTR_ERR(pdata); > + > adev->dev.platform_data = pdata; > > desc.type = CORESIGHT_DEV_TYPE_SOURCE; > @@ -865,17 +886,17 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id) > desc.dev = dev; > desc.groups = coresight_etm_groups; > drvdata->csdev = coresight_register(&desc); > - if (IS_ERR(drvdata->csdev)) { > - ret = PTR_ERR(drvdata->csdev); > - goto err_arch_supported; > - } > + if (IS_ERR(drvdata->csdev)) > + return PTR_ERR(drvdata->csdev); > > ret = etm_perf_symlink(drvdata->csdev, true); > if (ret) { > coresight_unregister(drvdata->csdev); > - goto err_arch_supported; > + return ret; > } > > + etmdrvdata[drvdata->cpu] = drvdata; > + > pm_runtime_put(&adev->dev); > dev_info(&drvdata->csdev->dev, > "%s initialized\n", (char *)coresight_get_uci_data(id)); > @@ -885,14 +906,40 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id) > } > > return 0; > +} > > -err_arch_supported: > - if (--etm_count == 0) { > - cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING); > - if (hp_online) > - cpuhp_remove_state_nocalls(hp_online); > - } > - return ret; > +static void __exit clear_etmdrvdata(void *info) > +{ > + int cpu = *(int *)info; > + > + etmdrvdata[cpu] = NULL; > +} > + > +static int __exit etm_remove(struct amba_device *adev) > +{ > + struct etm_drvdata *drvdata = dev_get_drvdata(&adev->dev); > + > + etm_perf_symlink(drvdata->csdev, false); > + > + /* > + * Taking hotplug lock here to avoid racing between etm_remove and > + * CPU hotplug call backs. > + */ > + cpus_read_lock(); > + /* > + * The readers for etmdrvdata[] are CPU hotplug call backs > + * and PM notification call backs. Change etmdrvdata[i] on > + * CPU i ensures these call backs has consistent view > + * inside one call back function. > + */ > + if (smp_call_function_single(drvdata->cpu, clear_etmdrvdata, &drvdata->cpu, 1)) > + etmdrvdata[drvdata->cpu] = NULL; > + > + cpus_read_unlock(); > + > + coresight_unregister(drvdata->csdev); > + > + return 0; > } > > #ifdef CONFIG_PM > @@ -937,6 +984,8 @@ static const struct amba_id etm_ids[] = { > { 0, 0}, > }; > > +MODULE_DEVICE_TABLE(amba, etm_ids); > + > static struct amba_driver etm_driver = { > .drv = { > .name = "coresight-etm3x", > @@ -945,6 +994,39 @@ static struct amba_driver etm_driver = { > .suppress_bind_attrs = true, > }, > .probe = etm_probe, > + .remove = etm_remove, > .id_table = etm_ids, > }; > -builtin_amba_driver(etm_driver); > + > +static int __init etm_init(void) > +{ > + int ret; > + > + ret = etm_hp_setup(); > + > + /* etm_pm_setup() does its own cleanup - exit on error */ Copy/paste error --> s/etm_pm_setup/etm_hp_setup > + if (ret) > + return ret; > + > + ret = amba_driver_register(&etm_driver); > + if (ret) { > + pr_err("Error registering etm3x driver\n"); > + etm_hp_clear(); > + } > + > + return ret; > +} > + > +static void __exit etm_exit(void) > +{ > + amba_driver_unregister(&etm_driver); > + etm_hp_clear(); > +} > + > +module_init(etm_init); > +module_exit(etm_exit); > + > +MODULE_AUTHOR("Pratik Patel "); > +MODULE_AUTHOR("Mathieu Poirier "); > +MODULE_DESCRIPTION("Arm CoreSight Program Flow Trace driver"); > +MODULE_LICENSE("GPL v2"); > -- > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, > a Linux Foundation Collaborative Project > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel