| Message ID | 20210316180400.7184-6-mike.leach@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | CoreSight configuration management; ETM strobing | expand |
On Tue, Mar 16, 2021 at 06:03:55PM +0000, Mike Leach wrote: > Configurations are first activated, then when any coresight device is > enabled, the active configurations are checked and any matching > one is enabled. > > This patch provides the activation / enable API. > > Signed-off-by: Mike Leach <mike.leach@linaro.org> > --- > .../hwtracing/coresight/coresight-config.h | 2 + > .../hwtracing/coresight/coresight-syscfg.c | 122 ++++++++++++++++++ > .../hwtracing/coresight/coresight-syscfg.h | 8 ++ > include/linux/coresight.h | 2 + > 4 files changed, 134 insertions(+) > Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> > diff --git a/drivers/hwtracing/coresight/coresight-config.h b/drivers/hwtracing/coresight/coresight-config.h > index 38fd1c71eb05..f1a5957a25c9 100644 > --- a/drivers/hwtracing/coresight/coresight-config.h > +++ b/drivers/hwtracing/coresight/coresight-config.h > @@ -127,6 +127,7 @@ struct cscfg_feature_desc { > * @nr_total_params: Sum of all parameters declared by used features > * @presets: Array of preset values. > * @event_ea: Extended attribute for perf event value > + * @active_cnt: ref count for activate on this configuration. > * > */ > struct cscfg_config_desc { > @@ -139,6 +140,7 @@ struct cscfg_config_desc { > int nr_total_params; > const u64 *presets; /* nr_presets * nr_total_params */ > struct dev_ext_attribute *event_ea; > + atomic_t active_cnt; > }; > > /** > diff --git a/drivers/hwtracing/coresight/coresight-syscfg.c b/drivers/hwtracing/coresight/coresight-syscfg.c > index 03014a2142c1..c44746d6cd6d 100644 > --- a/drivers/hwtracing/coresight/coresight-syscfg.c > +++ b/drivers/hwtracing/coresight/coresight-syscfg.c > @@ -284,6 +284,7 @@ static int cscfg_load_config(struct cscfg_config_desc *config_desc) > return err; > > list_add(&config_desc->item, &cscfg_mgr->config_desc_list); > + atomic_set(&config_desc->active_cnt, 0); > return 0; > } > > @@ -451,6 +452,126 @@ void cscfg_unregister_csdev(struct coresight_device *csdev) > } > EXPORT_SYMBOL_GPL(cscfg_unregister_csdev); > > +void cscfg_csdev_reset_feats(struct coresight_device *csdev) > +{ > + struct cscfg_feature_csdev *feat_csdev; > + > + mutex_lock(&cscfg_csdev_mutex); > + if (list_empty(&csdev->feature_csdev_list)) > + goto unlock_exit; > + > + list_for_each_entry(feat_csdev, &csdev->feature_csdev_list, node) > + cscfg_reset_feat(feat_csdev); > + > +unlock_exit: > + mutex_unlock(&cscfg_csdev_mutex); > +} > +EXPORT_SYMBOL_GPL(cscfg_csdev_reset_feats); > + > +/** > + * Mark a config descriptor as active. > + * This will be seen when csdev devices are activated in the system. > + * > + * Selection by hash value - generated from the configuration name when it > + * was loaded and added to the cs_etm/configurations file system for selection > + * by perf. > + * > + * @cfg_hash: Hash value of the selected configuration name. > + */ > +int cscfg_activate_config(unsigned long cfg_hash) > +{ > + struct cscfg_config_desc *config_desc; > + int err = -EINVAL; > + > + mutex_lock(&cscfg_mutex); > + > + list_for_each_entry(config_desc, &cscfg_mgr->config_desc_list, item) { > + if ((unsigned long)config_desc->event_ea->var == cfg_hash) { > + /* > + * increment the global active count - control changes to > + * active configurations > + */ > + atomic_inc(&cscfg_mgr->sys_active_cnt); > + > + /* > + * mark the descriptor as active so enable config on a > + * device instance will use it > + */ > + atomic_inc(&config_desc->active_cnt); > + > + err = 0; > + dev_dbg(cscfg_device(), "Activate config %s.\n", config_desc->name); > + break; > + } > + } > + mutex_unlock(&cscfg_mutex); > + > + return err; > +} > +EXPORT_SYMBOL_GPL(cscfg_activate_config); > + > +void cscfg_deactivate_config(unsigned long cfg_hash) > +{ > + struct cscfg_config_desc *config_desc; > + > + mutex_lock(&cscfg_mutex); > + > + list_for_each_entry(config_desc, &cscfg_mgr->config_desc_list, item) { > + if ((unsigned long)config_desc->event_ea->var == cfg_hash) { > + atomic_dec(&config_desc->active_cnt); > + atomic_dec(&cscfg_mgr->sys_active_cnt); > + dev_dbg(cscfg_device(), "Deactivate config %s.\n", config_desc->name); > + break; > + } > + } > + mutex_unlock(&cscfg_mutex); > +} > +EXPORT_SYMBOL_GPL(cscfg_deactivate_config); > + > +/* Find and program any active config for the supplied device.*/ > +int cscfg_csdev_enable_active_config(struct coresight_device *csdev, > + unsigned long cfg_hash, int preset) > +{ > + struct cscfg_config_csdev *config_csdev_active = NULL, *config_csdev_item; > + const struct cscfg_config_desc *config_desc; > + int err = 0; > + > + /* quickly check global count */ > + if (!atomic_read(&cscfg_mgr->sys_active_cnt)) > + return 0; > + > + mutex_lock(&cscfg_csdev_mutex); > + list_for_each_entry(config_csdev_item, &csdev->config_csdev_list, node) { > + config_desc = config_csdev_item->config_desc; > + if ((atomic_read(&config_desc->active_cnt)) && > + ((unsigned long)config_desc->event_ea->var == cfg_hash)) { > + config_csdev_active = config_csdev_item; > + break; > + } > + } > + if (config_csdev_active) { > + err = cscfg_csdev_enable_config(config_csdev_active, preset); > + if (!err) > + csdev->active_cscfg_ctxt = (void *)config_csdev_active; > + } > + mutex_unlock(&cscfg_csdev_mutex); > + return err; > +} > +EXPORT_SYMBOL_GPL(cscfg_csdev_enable_active_config); > + > +/* save and disable the active config for the device */ > +void cscfg_csdev_disable_active_config(struct coresight_device *csdev) > +{ > + struct cscfg_config_csdev *config_csdev; > + > + mutex_lock(&cscfg_csdev_mutex); > + config_csdev = (struct cscfg_config_csdev *)csdev->active_cscfg_ctxt; > + if (config_csdev) > + cscfg_csdev_disable_config(config_csdev); > + mutex_unlock(&cscfg_csdev_mutex); > +} > +EXPORT_SYMBOL_GPL(cscfg_csdev_disable_active_config); > + > /* Initialise system configuration management device. */ > > struct device *cscfg_device(void) > @@ -519,6 +640,7 @@ int __init cscfg_init(void) > INIT_LIST_HEAD(&cscfg_mgr->csdev_desc_list); > INIT_LIST_HEAD(&cscfg_mgr->feat_desc_list); > INIT_LIST_HEAD(&cscfg_mgr->config_desc_list); > + atomic_set(&cscfg_mgr->sys_active_cnt, 0); > > dev_info(cscfg_device(), "CoreSight Configuration manager initialised"); > return 0; > diff --git a/drivers/hwtracing/coresight/coresight-syscfg.h b/drivers/hwtracing/coresight/coresight-syscfg.h > index 5bcae3b374c6..a52775890670 100644 > --- a/drivers/hwtracing/coresight/coresight-syscfg.h > +++ b/drivers/hwtracing/coresight/coresight-syscfg.h > @@ -24,12 +24,14 @@ > * @csdev_desc_list: List of coresight devices registered with the configuration manager. > * @feat_desc_list: List of feature descriptors to load into registered devices. > * @config_desc_list: List of system configuration descriptors to load into registered devices. > + * @sys_active_cnt: Total number of active config descriptor references. > */ > struct cscfg_manager { > struct device dev; > struct list_head csdev_desc_list; > struct list_head feat_desc_list; > struct list_head config_desc_list; > + atomic_t sys_active_cnt; > }; > > /* get reference to dev in cscfg_manager */ > @@ -61,5 +63,11 @@ int cscfg_load_config_sets(struct cscfg_config_desc **cfg_descs, > int cscfg_register_csdev(struct coresight_device *csdev, u32 match_flags, > struct cscfg_csdev_feat_ops *ops); > void cscfg_unregister_csdev(struct coresight_device *csdev); > +int cscfg_activate_config(unsigned long cfg_hash); > +void cscfg_deactivate_config(unsigned long cfg_hash); > +void cscfg_csdev_reset_feats(struct coresight_device *csdev); > +int cscfg_csdev_enable_active_config(struct coresight_device *csdev, > + unsigned long cfg_hash, int preset); > +void cscfg_csdev_disable_active_config(struct coresight_device *csdev); > > #endif /* CORESIGHT_SYSCFG_H */ > diff --git a/include/linux/coresight.h b/include/linux/coresight.h > index d0126ed326a6..a3b39ce2d6ef 100644 > --- a/include/linux/coresight.h > +++ b/include/linux/coresight.h > @@ -221,6 +221,7 @@ struct coresight_sysfs_link { > * @has_conns_grp: Have added a "connections" group for sysfs links. > * @feature_csdev_list: List of complex feature programming added to the device. > * @config_csdev_list: List of system configurations added to the device. > + * @active_cscfg_ctxt: Context information for current active system configuration. > */ > struct coresight_device { > struct coresight_platform_data *pdata; > @@ -245,6 +246,7 @@ struct coresight_device { > /* system configuration and feature lists */ > struct list_head feature_csdev_list; > struct list_head config_csdev_list; > + void *active_cscfg_ctxt; > }; > > /* > -- > 2.17.1 >
diff --git a/drivers/hwtracing/coresight/coresight-config.h b/drivers/hwtracing/coresight/coresight-config.h index 38fd1c71eb05..f1a5957a25c9 100644 --- a/drivers/hwtracing/coresight/coresight-config.h +++ b/drivers/hwtracing/coresight/coresight-config.h @@ -127,6 +127,7 @@ struct cscfg_feature_desc { * @nr_total_params: Sum of all parameters declared by used features * @presets: Array of preset values. * @event_ea: Extended attribute for perf event value + * @active_cnt: ref count for activate on this configuration. * */ struct cscfg_config_desc { @@ -139,6 +140,7 @@ struct cscfg_config_desc { int nr_total_params; const u64 *presets; /* nr_presets * nr_total_params */ struct dev_ext_attribute *event_ea; + atomic_t active_cnt; }; /** diff --git a/drivers/hwtracing/coresight/coresight-syscfg.c b/drivers/hwtracing/coresight/coresight-syscfg.c index 03014a2142c1..c44746d6cd6d 100644 --- a/drivers/hwtracing/coresight/coresight-syscfg.c +++ b/drivers/hwtracing/coresight/coresight-syscfg.c @@ -284,6 +284,7 @@ static int cscfg_load_config(struct cscfg_config_desc *config_desc) return err; list_add(&config_desc->item, &cscfg_mgr->config_desc_list); + atomic_set(&config_desc->active_cnt, 0); return 0; } @@ -451,6 +452,126 @@ void cscfg_unregister_csdev(struct coresight_device *csdev) } EXPORT_SYMBOL_GPL(cscfg_unregister_csdev); +void cscfg_csdev_reset_feats(struct coresight_device *csdev) +{ + struct cscfg_feature_csdev *feat_csdev; + + mutex_lock(&cscfg_csdev_mutex); + if (list_empty(&csdev->feature_csdev_list)) + goto unlock_exit; + + list_for_each_entry(feat_csdev, &csdev->feature_csdev_list, node) + cscfg_reset_feat(feat_csdev); + +unlock_exit: + mutex_unlock(&cscfg_csdev_mutex); +} +EXPORT_SYMBOL_GPL(cscfg_csdev_reset_feats); + +/** + * Mark a config descriptor as active. + * This will be seen when csdev devices are activated in the system. + * + * Selection by hash value - generated from the configuration name when it + * was loaded and added to the cs_etm/configurations file system for selection + * by perf. + * + * @cfg_hash: Hash value of the selected configuration name. + */ +int cscfg_activate_config(unsigned long cfg_hash) +{ + struct cscfg_config_desc *config_desc; + int err = -EINVAL; + + mutex_lock(&cscfg_mutex); + + list_for_each_entry(config_desc, &cscfg_mgr->config_desc_list, item) { + if ((unsigned long)config_desc->event_ea->var == cfg_hash) { + /* + * increment the global active count - control changes to + * active configurations + */ + atomic_inc(&cscfg_mgr->sys_active_cnt); + + /* + * mark the descriptor as active so enable config on a + * device instance will use it + */ + atomic_inc(&config_desc->active_cnt); + + err = 0; + dev_dbg(cscfg_device(), "Activate config %s.\n", config_desc->name); + break; + } + } + mutex_unlock(&cscfg_mutex); + + return err; +} +EXPORT_SYMBOL_GPL(cscfg_activate_config); + +void cscfg_deactivate_config(unsigned long cfg_hash) +{ + struct cscfg_config_desc *config_desc; + + mutex_lock(&cscfg_mutex); + + list_for_each_entry(config_desc, &cscfg_mgr->config_desc_list, item) { + if ((unsigned long)config_desc->event_ea->var == cfg_hash) { + atomic_dec(&config_desc->active_cnt); + atomic_dec(&cscfg_mgr->sys_active_cnt); + dev_dbg(cscfg_device(), "Deactivate config %s.\n", config_desc->name); + break; + } + } + mutex_unlock(&cscfg_mutex); +} +EXPORT_SYMBOL_GPL(cscfg_deactivate_config); + +/* Find and program any active config for the supplied device.*/ +int cscfg_csdev_enable_active_config(struct coresight_device *csdev, + unsigned long cfg_hash, int preset) +{ + struct cscfg_config_csdev *config_csdev_active = NULL, *config_csdev_item; + const struct cscfg_config_desc *config_desc; + int err = 0; + + /* quickly check global count */ + if (!atomic_read(&cscfg_mgr->sys_active_cnt)) + return 0; + + mutex_lock(&cscfg_csdev_mutex); + list_for_each_entry(config_csdev_item, &csdev->config_csdev_list, node) { + config_desc = config_csdev_item->config_desc; + if ((atomic_read(&config_desc->active_cnt)) && + ((unsigned long)config_desc->event_ea->var == cfg_hash)) { + config_csdev_active = config_csdev_item; + break; + } + } + if (config_csdev_active) { + err = cscfg_csdev_enable_config(config_csdev_active, preset); + if (!err) + csdev->active_cscfg_ctxt = (void *)config_csdev_active; + } + mutex_unlock(&cscfg_csdev_mutex); + return err; +} +EXPORT_SYMBOL_GPL(cscfg_csdev_enable_active_config); + +/* save and disable the active config for the device */ +void cscfg_csdev_disable_active_config(struct coresight_device *csdev) +{ + struct cscfg_config_csdev *config_csdev; + + mutex_lock(&cscfg_csdev_mutex); + config_csdev = (struct cscfg_config_csdev *)csdev->active_cscfg_ctxt; + if (config_csdev) + cscfg_csdev_disable_config(config_csdev); + mutex_unlock(&cscfg_csdev_mutex); +} +EXPORT_SYMBOL_GPL(cscfg_csdev_disable_active_config); + /* Initialise system configuration management device. */ struct device *cscfg_device(void) @@ -519,6 +640,7 @@ int __init cscfg_init(void) INIT_LIST_HEAD(&cscfg_mgr->csdev_desc_list); INIT_LIST_HEAD(&cscfg_mgr->feat_desc_list); INIT_LIST_HEAD(&cscfg_mgr->config_desc_list); + atomic_set(&cscfg_mgr->sys_active_cnt, 0); dev_info(cscfg_device(), "CoreSight Configuration manager initialised"); return 0; diff --git a/drivers/hwtracing/coresight/coresight-syscfg.h b/drivers/hwtracing/coresight/coresight-syscfg.h index 5bcae3b374c6..a52775890670 100644 --- a/drivers/hwtracing/coresight/coresight-syscfg.h +++ b/drivers/hwtracing/coresight/coresight-syscfg.h @@ -24,12 +24,14 @@ * @csdev_desc_list: List of coresight devices registered with the configuration manager. * @feat_desc_list: List of feature descriptors to load into registered devices. * @config_desc_list: List of system configuration descriptors to load into registered devices. + * @sys_active_cnt: Total number of active config descriptor references. */ struct cscfg_manager { struct device dev; struct list_head csdev_desc_list; struct list_head feat_desc_list; struct list_head config_desc_list; + atomic_t sys_active_cnt; }; /* get reference to dev in cscfg_manager */ @@ -61,5 +63,11 @@ int cscfg_load_config_sets(struct cscfg_config_desc **cfg_descs, int cscfg_register_csdev(struct coresight_device *csdev, u32 match_flags, struct cscfg_csdev_feat_ops *ops); void cscfg_unregister_csdev(struct coresight_device *csdev); +int cscfg_activate_config(unsigned long cfg_hash); +void cscfg_deactivate_config(unsigned long cfg_hash); +void cscfg_csdev_reset_feats(struct coresight_device *csdev); +int cscfg_csdev_enable_active_config(struct coresight_device *csdev, + unsigned long cfg_hash, int preset); +void cscfg_csdev_disable_active_config(struct coresight_device *csdev); #endif /* CORESIGHT_SYSCFG_H */ diff --git a/include/linux/coresight.h b/include/linux/coresight.h index d0126ed326a6..a3b39ce2d6ef 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -221,6 +221,7 @@ struct coresight_sysfs_link { * @has_conns_grp: Have added a "connections" group for sysfs links. * @feature_csdev_list: List of complex feature programming added to the device. * @config_csdev_list: List of system configurations added to the device. + * @active_cscfg_ctxt: Context information for current active system configuration. */ struct coresight_device { struct coresight_platform_data *pdata; @@ -245,6 +246,7 @@ struct coresight_device { /* system configuration and feature lists */ struct list_head feature_csdev_list; struct list_head config_csdev_list; + void *active_cscfg_ctxt; }; /*
Configurations are first activated, then when any coresight device is enabled, the active configurations are checked and any matching one is enabled. This patch provides the activation / enable API. Signed-off-by: Mike Leach <mike.leach@linaro.org> --- .../hwtracing/coresight/coresight-config.h | 2 + .../hwtracing/coresight/coresight-syscfg.c | 122 ++++++++++++++++++ .../hwtracing/coresight/coresight-syscfg.h | 8 ++ include/linux/coresight.h | 2 + 4 files changed, 134 insertions(+)