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Thu, 28 Jan 2021 09:09:48 -0800 (PST) From: Mike Leach To: linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org, mathieu.poirier@linaro.org, linux-doc@vger.kernel.org, suzuki.poulose@arm.com Subject: [PATCH v4 04/10] coresight: etm-perf: update to handle configuration selection Date: Thu, 28 Jan 2021 17:09:30 +0000 Message-Id: <20210128170936.9222-5-mike.leach@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210128170936.9222-1-mike.leach@linaro.org> References: <20210128170936.9222-1-mike.leach@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210128_120949_922619_B1FE3985 X-CRM114-Status: GOOD ( 30.29 ) 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: gregkh@linuxfoundation.org, alexander.shishkin@linux.intel.com, yabinc@google.com, corbet@lwn.net, linux-kernel@vger.kernel.org, tingwei@codeaurora.org, leo.yan@linaro.org, Mike Leach MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Loaded coresight configurations are registered in the cs_etm\cs_config sub directory. This extends the etm-perf code to handle these registrations, and the cs_syscfg driver to perform the registration on load. Signed-off-by: Mike Leach --- .../hwtracing/coresight/coresight-config.h | 5 +- .../hwtracing/coresight/coresight-etm-perf.c | 164 +++++++++++++++--- .../hwtracing/coresight/coresight-etm-perf.h | 8 + .../hwtracing/coresight/coresight-syscfg.c | 13 +- 4 files changed, 166 insertions(+), 24 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-config.h b/drivers/hwtracing/coresight/coresight-config.h index 9d66e0071f38..98380b496046 100644 --- a/drivers/hwtracing/coresight/coresight-config.h +++ b/drivers/hwtracing/coresight/coresight-config.h @@ -154,7 +154,8 @@ struct cscfg_config_feat_ref { * @nr_presets: Number of sets of presets supplied by this configuration. * @nr_total_params: Sum of all parameters declared by used features * @presets: Array of preset values. - * + * @id_ea: Extended attribute for perf configid value + * @event_ea: Extended attribute for perf event value */ struct cscfg_config_desc { const char *name; @@ -165,6 +166,8 @@ struct cscfg_config_desc { int nr_presets; int nr_total_params; const u64 *presets; /* nr_presets * nr_total_params */ + struct dev_ext_attribute *id_ea; + struct dev_ext_attribute *event_ea; }; /** diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c index a608081bd446..e270bb1e0f7d 100644 --- a/drivers/hwtracing/coresight/coresight-etm-perf.c +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c @@ -18,8 +18,10 @@ #include #include +#include "coresight-config.h" #include "coresight-etm-perf.h" #include "coresight-priv.h" +#include "coresight-syscfg.h" static struct pmu etm_pmu; static bool etm_perf_up; @@ -32,8 +34,13 @@ PMU_FORMAT_ATTR(cycacc, "config:" __stringify(ETM_OPT_CYCACC)); PMU_FORMAT_ATTR(contextid, "config:" __stringify(ETM_OPT_CTXTID)); PMU_FORMAT_ATTR(timestamp, "config:" __stringify(ETM_OPT_TS)); PMU_FORMAT_ATTR(retstack, "config:" __stringify(ETM_OPT_RETSTK)); +/* preset - if sink ID is used as a configuration selector */ +PMU_FORMAT_ATTR(preset, "config:0-3"); /* Sink ID - same for all ETMs */ PMU_FORMAT_ATTR(sinkid, "config2:0-31"); +/* config ID - set if a system configuration is selected */ +PMU_FORMAT_ATTR(configid, "config2:32-63"); + static struct attribute *etm_config_formats_attr[] = { &format_attr_cycacc.attr, @@ -41,6 +48,8 @@ static struct attribute *etm_config_formats_attr[] = { &format_attr_timestamp.attr, &format_attr_retstack.attr, &format_attr_sinkid.attr, + &format_attr_preset.attr, + &format_attr_configid.attr, NULL, }; @@ -58,9 +67,29 @@ static const struct attribute_group etm_pmu_sinks_group = { .attrs = etm_config_sinks_attr, }; +static struct attribute *etm_config_cscfg_attr[] = { + NULL, +}; + +static const struct attribute_group etm_pmu_cscfg_group = { + .name = "configurations", + .attrs = etm_config_cscfg_attr, +}; + +static struct attribute *etm_config_events_attr[] = { + NULL, +}; + +static const struct attribute_group etm_pmu_events_group = { + .name = "events", + .attrs = etm_config_events_attr, +}; + static const struct attribute_group *etm_pmu_attr_groups[] = { &etm_pmu_format_group, &etm_pmu_sinks_group, + &etm_pmu_cscfg_group, + &etm_pmu_events_group, NULL, }; @@ -219,7 +248,7 @@ static void *etm_setup_aux(struct perf_event *event, void **pages, INIT_WORK(&event_data->work, free_event_data); /* First get the selected sink from user space. */ - if (event->attr.config2) { + if (event->attr.config2 & GENMASK_ULL(31, 0)) { id = (u32)event->attr.config2; sink = coresight_get_sink_by_id(id); } @@ -537,21 +566,17 @@ static ssize_t etm_perf_sink_name_show(struct device *dev, return scnprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)(ea->var)); } -int etm_perf_add_symlink_sink(struct coresight_device *csdev) +int etm_perf_add_symlink_group(struct device *dev, + struct dev_ext_attribute **ext_attr, + const char *name, + const char *group_name) { - int ret; + struct dev_ext_attribute *ea; unsigned long hash; - const char *name; + int ret; struct device *pmu_dev = etm_pmu.dev; - struct device *dev = &csdev->dev; - struct dev_ext_attribute *ea; - if (csdev->type != CORESIGHT_DEV_TYPE_SINK && - csdev->type != CORESIGHT_DEV_TYPE_LINKSINK) - return -EINVAL; - - if (csdev->ea != NULL) - return -EINVAL; + *ext_attr = NULL; if (!etm_perf_up) return -EPROBE_DEFER; @@ -560,7 +585,6 @@ int etm_perf_add_symlink_sink(struct coresight_device *csdev) if (!ea) return -ENOMEM; - name = dev_name(dev); /* See function coresight_get_sink_by_id() to know where this is used */ hash = hashlen_hash(hashlen_string(NULL, name)); @@ -574,31 +598,127 @@ int etm_perf_add_symlink_sink(struct coresight_device *csdev) ea->var = (unsigned long *)hash; ret = sysfs_add_file_to_group(&pmu_dev->kobj, - &ea->attr.attr, "sinks"); - + &ea->attr.attr, group_name); if (!ret) - csdev->ea = ea; - + *ext_attr = ea; return ret; } -void etm_perf_del_symlink_sink(struct coresight_device *csdev) +int etm_perf_add_symlink_sink(struct coresight_device *csdev) +{ + const char *name; + struct device *dev = &csdev->dev; + + if (csdev->type != CORESIGHT_DEV_TYPE_SINK && + csdev->type != CORESIGHT_DEV_TYPE_LINKSINK) + return -EINVAL; + + if (csdev->ea != NULL) + return -EINVAL; + + name = dev_name(dev); + return etm_perf_add_symlink_group(dev, &csdev->ea, name, "sinks"); +} + +void etm_perf_del_symlink_group(struct dev_ext_attribute *ea, const char *group_name) { struct device *pmu_dev = etm_pmu.dev; - struct dev_ext_attribute *ea = csdev->ea; + sysfs_remove_file_from_group(&pmu_dev->kobj, + &ea->attr.attr, group_name); +} + +void etm_perf_del_symlink_sink(struct coresight_device *csdev) +{ if (csdev->type != CORESIGHT_DEV_TYPE_SINK && csdev->type != CORESIGHT_DEV_TYPE_LINKSINK) return; - if (!ea) + if (!csdev->ea) return; - sysfs_remove_file_from_group(&pmu_dev->kobj, - &ea->attr.attr, "sinks"); + etm_perf_del_symlink_group(csdev->ea, "sinks"); csdev->ea = NULL; } +/* string to contain the attribute value */ +#define CSCFG_EVENT_STR_SIZE 32 + +static ssize_t etm_perf_cscfg_event_show(struct device *dev, + struct device_attribute *dattr, + char *buf) +{ + struct dev_ext_attribute *ea; + + ea = container_of(dattr, struct dev_ext_attribute, attr); + return scnprintf(buf, PAGE_SIZE, "%s\n", (const char *)(ea->var)); +} + +static int etm_perf_add_cscfg_event(struct device *dev, struct cscfg_config_desc *cs_cfg) +{ + struct dev_ext_attribute *ea; + unsigned long hash; + int ret; + struct device *pmu_dev = etm_pmu.dev; + + ea = devm_kzalloc(dev, sizeof(*ea), GFP_KERNEL); + if (!ea) + return -ENOMEM; + + hash = (unsigned long)cs_cfg->id_ea->var; + + sysfs_attr_init(&ea->attr.attr); + ea->attr.attr.name = devm_kstrdup(dev, cs_cfg->name, GFP_KERNEL); + if (!ea->attr.attr.name) + return -ENOMEM; + + /* + * attribute value is "configid=". + * this will be what perf evaluates when the config name is used + * on the command line. + */ + ea->var = devm_kzalloc(dev, CSCFG_EVENT_STR_SIZE, GFP_KERNEL); + if (!ea->var) + return -ENOMEM; + + scnprintf(ea->var, CSCFG_EVENT_STR_SIZE, "configid=0x%lx", hash); + ea->attr.attr.mode = 0444; + ea->attr.show = etm_perf_cscfg_event_show; + + ret = sysfs_add_file_to_group(&pmu_dev->kobj, + &ea->attr.attr, "events"); + if (!ret) + cs_cfg->event_ea = ea; + return ret; +} + +int etm_perf_add_symlink_cscfg(struct device *dev, struct cscfg_config_desc *cs_cfg) +{ + int err; + + if (cs_cfg->id_ea != NULL) + return 0; + + err = etm_perf_add_symlink_group(dev, &cs_cfg->id_ea, + cs_cfg->name, "configurations"); + + if (!err) + err = etm_perf_add_cscfg_event(dev, cs_cfg); + + return err; +} + +void etm_perf_del_symlink_cscfg(struct cscfg_config_desc *cs_cfg) +{ + if (!cs_cfg->id_ea) + return; + + etm_perf_del_symlink_group(cs_cfg->id_ea, "configurations"); + etm_perf_del_symlink_group(cs_cfg->event_ea, "events"); + cs_cfg->id_ea = NULL; + cs_cfg->event_ea = NULL; +} + int __init etm_perf_init(void) { int ret; diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.h b/drivers/hwtracing/coresight/coresight-etm-perf.h index 29d90dfeba31..3646a3837a0b 100644 --- a/drivers/hwtracing/coresight/coresight-etm-perf.h +++ b/drivers/hwtracing/coresight/coresight-etm-perf.h @@ -11,6 +11,7 @@ #include "coresight-priv.h" struct coresight_device; +struct cscfg_config_desc; /* * In both ETMv3 and v4 the maximum number of address comparator implentable @@ -69,6 +70,9 @@ static inline void *etm_perf_sink_config(struct perf_output_handle *handle) return data->snk_config; return NULL; } +int etm_perf_add_symlink_cscfg(struct device *dev, + struct cscfg_config_desc *cscfg_desc); +void etm_perf_del_symlink_cscfg(struct cscfg_config_desc *cscfg_desc); #else static inline int etm_perf_symlink(struct coresight_device *csdev, bool link) { return -EINVAL; } @@ -79,6 +83,10 @@ static inline void *etm_perf_sink_config(struct perf_output_handle *handle) { return NULL; } +int etm_perf_add_symlink_cscfg(struct device *dev, + struct cscfg_config_desc *cscfg_desc) +{ return -EINVAL; } +void etm_perf_del_symlink_cscfg(struct cscfg_config_desc *cscfg_desc) {} #endif /* CONFIG_CORESIGHT */ diff --git a/drivers/hwtracing/coresight/coresight-syscfg.c b/drivers/hwtracing/coresight/coresight-syscfg.c index 4b8e4e35e3e7..a070f135eca3 100644 --- a/drivers/hwtracing/coresight/coresight-syscfg.c +++ b/drivers/hwtracing/coresight/coresight-syscfg.c @@ -7,6 +7,7 @@ #include #include "coresight-config.h" +#include "coresight-etm-perf.h" #include "coresight-syscfg.h" /* @@ -100,6 +101,7 @@ static int cscfg_add_csdev_cfg(struct coresight_device *csdev, dev_cfg->feats[dev_cfg->nr_feat++] = feat; } } + /* if matched features, add config to device.*/ if (dev_cfg) { mutex_lock(&cscfg_csdev_mutex); @@ -290,8 +292,12 @@ static int cscfg_load_config(struct cscfg_config_desc *cfg_desc) if (err) return err; - list_add(&cfg_desc->item, &cscfg_mgr->data.config_desc_list); + /* add config to perf fs to allow selection */ + err = etm_perf_add_symlink_cscfg(to_device_cscfg(), cfg_desc); + if (err) + return err; + list_add(&cfg_desc->item, &cscfg_mgr->data.config_desc_list); return 0; } @@ -517,7 +523,12 @@ int cscfg_create_device(void) void cscfg_clear_device(void) { + struct cscfg_config_desc *cfg_desc; + mutex_lock(&cscfg_mutex); + list_for_each_entry(cfg_desc, &cscfg_mgr->data.config_desc_list, item) { + etm_perf_del_symlink_cscfg(cfg_desc); + } device_unregister(to_device_cscfg()); mutex_unlock(&cscfg_mutex); }