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Leo Yan ; > Suzuki Poulose ; Mike Leach > ; Alexander Shishkin > > Cc: Greg Kroah-Hartman ; Jonathan Corbet > ; Mathieu Poirier ; Randy > Dunlap ; Shuah Khan ; > coresight@lists.linaro.org; linux-arm-kernel@lists.infradead.org; linux- > doc@vger.kernel.org; linux-kernel@vger.kernel.org > Subject: [PATCH v2 1/4] coresight: syscfg: Fail to enable a configuration= not > loaded on the device >=20 > cscfg_csdev_enable_active_config() looks up the selected configuration in > the device's loaded configurations, and returns success when it is not > there. A configuration is only loaded on devices that match at least one > of its features, so a perf session or sysfs enable that selects it on any > other device runs without the configuration, with no error. >=20 > Return -EINVAL instead, so enabling the source fails on that device. The > function is only called with a non-zero configuration hash, so sources > enabled without a configuration are unaffected. >=20 If you look at the original comments - the idea of this function is to enab= le a configuration on a device if it is present on that device. Not enabling a configuration is _not_ an error. This is a generic function = that can cover multiple classes of coresight device. Moving forwards matching configurations to devices can omit certain devices= from the configuration.=20 For example, a system will have many CTIs, but we may only want to use a sp= ecific one or two - possibly to connect etm external outputs to trigger a P= E interrupt. Thus the remaining CTIs would not be active in this configuration. This conflicts with your purpose which I assume is to prevent perf from usi= ng ETM sources that cannot load the required configuration. I think what is actually needed is a "can_activate" function to be run on t= he ETM/ETE sources at etm_setup_aux time so that none compliant devices can= be filtered out of the active cpu mask at that point. Regards Mike > Fixes: f8cce2ff3c04 ("coresight: syscfg: Add API to activate and enable > configurations") > Assisted-by: Devmate:Opus-5.5 > Signed-off-by: Amir Ayupov > --- > .../hwtracing/coresight/coresight-syscfg.c | 53 ++++++++++--------- > 1 file changed, 28 insertions(+), 25 deletions(-) >=20 > diff --git a/drivers/hwtracing/coresight/coresight-syscfg.c > b/drivers/hwtracing/coresight/coresight-syscfg.c > index 2bfdd7b45e49c..a816c22c87bc8 100644 > --- a/drivers/hwtracing/coresight/coresight-syscfg.c > +++ b/drivers/hwtracing/coresight/coresight-syscfg.c > @@ -1088,36 +1088,39 @@ int cscfg_csdev_enable_active_config(struct > coresight_device *csdev, > raw_spin_unlock_irqrestore(&csdev->cscfg_csdev_lock, flags); >=20 > /* > - * If found, attempt to enable > + * The configuration is active but not loaded on this device, because > + * none of its features match the device. Fail rather than trace > + * without it. > */ > - if (config_csdev_active) { > + if (!config_csdev_active) > + return -EINVAL; > + > + /* > + * Call the generic routine that will program up the internal > + * driver structures prior to programming up the hardware. > + * This routine takes the driver spinlock saved in the configs. > + */ > + err =3D cscfg_csdev_enable_config(config_csdev_active, preset); > + if (!err) { > /* > - * Call the generic routine that will program up the internal > - * driver structures prior to programming up the hardware. > - * This routine takes the driver spinlock saved in the configs. > + * Successful programming. Check the active_cscfg_ctxt > + * pointer to ensure no pre-emption disabled it via > + * cscfg_csdev_disable_active_config() before > + * we could start. > + * > + * Set enabled if OK, err if not. > */ > - err =3D cscfg_csdev_enable_config(config_csdev_active, preset); > - if (!err) { > - /* > - * Successful programming. Check the > active_cscfg_ctxt > - * pointer to ensure no pre-emption disabled it via > - * cscfg_csdev_disable_active_config() before > - * we could start. > - * > - * Set enabled if OK, err if not. > - */ > - raw_spin_lock_irqsave(&csdev->cscfg_csdev_lock, > flags); > - if (csdev->active_cscfg_ctxt) > - config_csdev_active->enabled =3D true; > - else > - err =3D -EBUSY; > - raw_spin_unlock_irqrestore(&csdev- > >cscfg_csdev_lock, flags); > - } > - > - if (err) > - cscfg_config_desc_put(config_desc); > + raw_spin_lock_irqsave(&csdev->cscfg_csdev_lock, flags); > + if (csdev->active_cscfg_ctxt) > + config_csdev_active->enabled =3D true; > + else > + err =3D -EBUSY; > + raw_spin_unlock_irqrestore(&csdev->cscfg_csdev_lock, flags); > } >=20 > + if (err) > + cscfg_config_desc_put(config_desc); > + > return err; > } > EXPORT_SYMBOL_GPL(cscfg_csdev_enable_active_config); > -- > 2.52.0