diff options
author | Greg Kroah-Hartman | 2022-07-11 20:54:28 +0200 |
---|---|---|
committer | Greg Kroah-Hartman | 2022-07-11 20:54:28 +0200 |
commit | 7e724422a7e9dfc8229ba90ee95aaafb902a788b (patch) | |
tree | f24b9a9d15040948475ccde31425fff1332937cf /drivers | |
parent | 4682f21368352ce087e3a2f73e1e6d776c38f685 (diff) | |
parent | 4d45bc82df667ad9e9cb8361830e54fc1264e993 (diff) |
Merge tag 'coresight-next-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/coresight/linux into char-misc-next
Suzuki writes:
CoreSight self-hosted tracing changes for v5.20.
- Fixes LOCKDEP warnings on module unload with configfs
- Conversion of DT bindings to DT schema
- Branch broadcast support for perf cs_etm
- Etm4x driver fixes for build failures with Clang and unrolled loops
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
* tag 'coresight-next-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/coresight/linux:
coresight: etm4x: avoid build failure with unrolled loops
Documentation: coresight: Expand branch broadcast documentation
Documentation: coresight: Link config options to existing documentation
Documentation: coresight: Turn numbered subsections into real subsections
coresight: Add config flag to enable branch broadcast
Documentation: coresight: Escape coresight bindings file wildcard
dt-bindings: arm: Convert CoreSight CPU debug to DT schema
dt-bindings: arm: Convert CoreSight bindings to DT schema
dt-bindings: arm: Rename Coresight filenames to match compatible
coresight: syscfg: Update load and unload operations
coresight: configfs: Fix unload of configurations on module exit
coresight: Clear the connection field properly
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/hwtracing/coresight/coresight-config.h | 2 | ||||
-rw-r--r-- | drivers/hwtracing/coresight/coresight-core.c | 1 | ||||
-rw-r--r-- | drivers/hwtracing/coresight/coresight-etm-perf.c | 2 | ||||
-rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x-core.c | 14 | ||||
-rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x.h | 3 | ||||
-rw-r--r-- | drivers/hwtracing/coresight/coresight-syscfg.c | 295 | ||||
-rw-r--r-- | drivers/hwtracing/coresight/coresight-syscfg.h | 13 |
7 files changed, 277 insertions, 53 deletions
diff --git a/drivers/hwtracing/coresight/coresight-config.h b/drivers/hwtracing/coresight/coresight-config.h index 2e1670523461..6ba013975741 100644 --- a/drivers/hwtracing/coresight/coresight-config.h +++ b/drivers/hwtracing/coresight/coresight-config.h @@ -134,6 +134,7 @@ struct cscfg_feature_desc { * @active_cnt: ref count for activate on this configuration. * @load_owner: handle to load owner for dynamic load and unload of configs. * @fs_group: reference to configfs group for dynamic unload. + * @available: config can be activated - multi-stage load sets true on completion. */ struct cscfg_config_desc { const char *name; @@ -148,6 +149,7 @@ struct cscfg_config_desc { atomic_t active_cnt; void *load_owner; struct config_group *fs_group; + bool available; }; /** diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c index ee6ce92ab4c3..1edfec1e9d18 100644 --- a/drivers/hwtracing/coresight/coresight-core.c +++ b/drivers/hwtracing/coresight/coresight-core.c @@ -1424,6 +1424,7 @@ static int coresight_remove_match(struct device *dev, void *data) * platform data. */ fwnode_handle_put(conn->child_fwnode); + conn->child_fwnode = NULL; /* No need to continue */ break; } diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c index c039b6ae206f..43bbd5dc3d3b 100644 --- a/drivers/hwtracing/coresight/coresight-etm-perf.c +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c @@ -52,6 +52,7 @@ static DEFINE_PER_CPU(struct coresight_device *, csdev_src); * The PMU formats were orignally for ETMv3.5/PTM's ETMCR 'config'; * now take them as general formats and apply on all ETMs. */ +PMU_FORMAT_ATTR(branch_broadcast, "config:"__stringify(ETM_OPT_BRANCH_BROADCAST)); PMU_FORMAT_ATTR(cycacc, "config:" __stringify(ETM_OPT_CYCACC)); /* contextid1 enables tracing CONTEXTIDR_EL1 for ETMv4 */ PMU_FORMAT_ATTR(contextid1, "config:" __stringify(ETM_OPT_CTXTID)); @@ -97,6 +98,7 @@ static struct attribute *etm_config_formats_attr[] = { &format_attr_sinkid.attr, &format_attr_preset.attr, &format_attr_configid.attr, + &format_attr_branch_broadcast.attr, NULL, }; diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index 87299e99dabb..cf249ecad5a5 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -696,6 +696,20 @@ static int etm4_parse_event_config(struct coresight_device *csdev, ret = cscfg_csdev_enable_active_config(csdev, cfg_hash, preset); } + /* branch broadcast - enable if selected and supported */ + if (attr->config & BIT(ETM_OPT_BRANCH_BROADCAST)) { + if (!drvdata->trcbb) { + /* + * Missing BB support could cause silent decode errors + * so fail to open if it's not supported. + */ + ret = -EINVAL; + goto out; + } else { + config->cfg |= BIT(ETM4_CFG_BIT_BB); + } + } + out: return ret; } diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h index 33869c1d20c3..a7bfea31f7d8 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.h +++ b/drivers/hwtracing/coresight/coresight-etm4x.h @@ -7,6 +7,7 @@ #define _CORESIGHT_CORESIGHT_ETM_H #include <asm/local.h> +#include <linux/const.h> #include <linux/spinlock.h> #include <linux/types.h> #include "coresight-priv.h" @@ -515,7 +516,7 @@ ({ \ u64 __val; \ \ - if (__builtin_constant_p((offset))) \ + if (__is_constexpr((offset))) \ __val = read_etm4x_sysreg_const_offset((offset)); \ else \ __val = etm4x_sysreg_read((offset), true, (_64bit)); \ diff --git a/drivers/hwtracing/coresight/coresight-syscfg.c b/drivers/hwtracing/coresight/coresight-syscfg.c index 11850fd8c3b5..11138a9762b0 100644 --- a/drivers/hwtracing/coresight/coresight-syscfg.c +++ b/drivers/hwtracing/coresight/coresight-syscfg.c @@ -415,6 +415,27 @@ static void cscfg_remove_owned_csdev_features(struct coresight_device *csdev, vo } /* + * Unregister all configuration and features from configfs owned by load_owner. + * Although this is called without the list mutex being held, it is in the + * context of an unload operation which are strictly serialised, + * so the lists cannot change during this call. + */ +static void cscfg_fs_unregister_cfgs_feats(void *load_owner) +{ + struct cscfg_config_desc *config_desc; + struct cscfg_feature_desc *feat_desc; + + list_for_each_entry(config_desc, &cscfg_mgr->config_desc_list, item) { + if (config_desc->load_owner == load_owner) + cscfg_configfs_del_config(config_desc); + } + list_for_each_entry(feat_desc, &cscfg_mgr->feat_desc_list, item) { + if (feat_desc->load_owner == load_owner) + cscfg_configfs_del_feature(feat_desc); + } +} + +/* * removal is relatively easy - just remove from all lists, anything that * matches the owner. Memory for the descriptors will be managed by the owner, * memory for the csdev items is devm_ allocated with the individual csdev @@ -426,6 +447,8 @@ static void cscfg_unload_owned_cfgs_feats(void *load_owner) struct cscfg_feature_desc *feat_desc, *feat_tmp; struct cscfg_registered_csdev *csdev_item; + lockdep_assert_held(&cscfg_mutex); + /* remove from each csdev instance feature and config lists */ list_for_each_entry(csdev_item, &cscfg_mgr->csdev_desc_list, item) { /* @@ -439,7 +462,6 @@ static void cscfg_unload_owned_cfgs_feats(void *load_owner) /* remove from the config descriptor lists */ list_for_each_entry_safe(config_desc, cfg_tmp, &cscfg_mgr->config_desc_list, item) { if (config_desc->load_owner == load_owner) { - cscfg_configfs_del_config(config_desc); etm_perf_del_symlink_cscfg(config_desc); list_del(&config_desc->item); } @@ -448,12 +470,90 @@ static void cscfg_unload_owned_cfgs_feats(void *load_owner) /* remove from the feature descriptor lists */ list_for_each_entry_safe(feat_desc, feat_tmp, &cscfg_mgr->feat_desc_list, item) { if (feat_desc->load_owner == load_owner) { - cscfg_configfs_del_feature(feat_desc); list_del(&feat_desc->item); } } } +/* + * load the features and configs to the lists - called with list mutex held + */ +static int cscfg_load_owned_cfgs_feats(struct cscfg_config_desc **config_descs, + struct cscfg_feature_desc **feat_descs, + struct cscfg_load_owner_info *owner_info) +{ + int i, err; + + lockdep_assert_held(&cscfg_mutex); + + /* load features first */ + if (feat_descs) { + for (i = 0; feat_descs[i]; i++) { + err = cscfg_load_feat(feat_descs[i]); + if (err) { + pr_err("coresight-syscfg: Failed to load feature %s\n", + feat_descs[i]->name); + return err; + } + feat_descs[i]->load_owner = owner_info; + } + } + + /* next any configurations to check feature dependencies */ + if (config_descs) { + for (i = 0; config_descs[i]; i++) { + err = cscfg_load_config(config_descs[i]); + if (err) { + pr_err("coresight-syscfg: Failed to load configuration %s\n", + config_descs[i]->name); + return err; + } + config_descs[i]->load_owner = owner_info; + config_descs[i]->available = false; + } + } + return 0; +} + +/* set configurations as available to activate at the end of the load process */ +static void cscfg_set_configs_available(struct cscfg_config_desc **config_descs) +{ + int i; + + lockdep_assert_held(&cscfg_mutex); + + if (config_descs) { + for (i = 0; config_descs[i]; i++) + config_descs[i]->available = true; + } +} + +/* + * Create and register each of the configurations and features with configfs. + * Called without mutex being held. + */ +static int cscfg_fs_register_cfgs_feats(struct cscfg_config_desc **config_descs, + struct cscfg_feature_desc **feat_descs) +{ + int i, err; + + if (feat_descs) { + for (i = 0; feat_descs[i]; i++) { + err = cscfg_configfs_add_feature(feat_descs[i]); + if (err) + return err; + } + } + if (config_descs) { + for (i = 0; config_descs[i]; i++) { + err = cscfg_configfs_add_config(config_descs[i]); + if (err) + return err; + } + } + return 0; +} + /** * cscfg_load_config_sets - API function to load feature and config sets. * @@ -476,57 +576,63 @@ int cscfg_load_config_sets(struct cscfg_config_desc **config_descs, struct cscfg_feature_desc **feat_descs, struct cscfg_load_owner_info *owner_info) { - int err = 0, i = 0; + int err = 0; mutex_lock(&cscfg_mutex); - - /* load features first */ - if (feat_descs) { - while (feat_descs[i]) { - err = cscfg_load_feat(feat_descs[i]); - if (!err) - err = cscfg_configfs_add_feature(feat_descs[i]); - if (err) { - pr_err("coresight-syscfg: Failed to load feature %s\n", - feat_descs[i]->name); - cscfg_unload_owned_cfgs_feats(owner_info); - goto exit_unlock; - } - feat_descs[i]->load_owner = owner_info; - i++; - } + if (cscfg_mgr->load_state != CSCFG_NONE) { + mutex_unlock(&cscfg_mutex); + return -EBUSY; } + cscfg_mgr->load_state = CSCFG_LOAD; - /* next any configurations to check feature dependencies */ - i = 0; - if (config_descs) { - while (config_descs[i]) { - err = cscfg_load_config(config_descs[i]); - if (!err) - err = cscfg_configfs_add_config(config_descs[i]); - if (err) { - pr_err("coresight-syscfg: Failed to load configuration %s\n", - config_descs[i]->name); - cscfg_unload_owned_cfgs_feats(owner_info); - goto exit_unlock; - } - config_descs[i]->load_owner = owner_info; - i++; - } - } + /* first load and add to the lists */ + err = cscfg_load_owned_cfgs_feats(config_descs, feat_descs, owner_info); + if (err) + goto err_clean_load; /* add the load owner to the load order list */ list_add_tail(&owner_info->item, &cscfg_mgr->load_order_list); if (!list_is_singular(&cscfg_mgr->load_order_list)) { /* lock previous item in load order list */ err = cscfg_owner_get(list_prev_entry(owner_info, item)); - if (err) { - cscfg_unload_owned_cfgs_feats(owner_info); - list_del(&owner_info->item); - } + if (err) + goto err_clean_owner_list; } + /* + * make visible to configfs - configfs manipulation must occur outside + * the list mutex lock to avoid circular lockdep issues with configfs + * built in mutexes and semaphores. This is safe as it is not possible + * to start a new load/unload operation till the current one is done. + */ + mutex_unlock(&cscfg_mutex); + + /* create the configfs elements */ + err = cscfg_fs_register_cfgs_feats(config_descs, feat_descs); + mutex_lock(&cscfg_mutex); + + if (err) + goto err_clean_cfs; + + /* mark any new configs as available for activation */ + cscfg_set_configs_available(config_descs); + goto exit_unlock; + +err_clean_cfs: + /* cleanup after error registering with configfs */ + cscfg_fs_unregister_cfgs_feats(owner_info); + + if (!list_is_singular(&cscfg_mgr->load_order_list)) + cscfg_owner_put(list_prev_entry(owner_info, item)); + +err_clean_owner_list: + list_del(&owner_info->item); + +err_clean_load: + cscfg_unload_owned_cfgs_feats(owner_info); + exit_unlock: + cscfg_mgr->load_state = CSCFG_NONE; mutex_unlock(&cscfg_mutex); return err; } @@ -543,6 +649,9 @@ EXPORT_SYMBOL_GPL(cscfg_load_config_sets); * 1) no configurations are active. * 2) the set being unloaded was the last to be loaded to maintain dependencies. * + * Once the unload operation commences, we disallow any configuration being + * made active until it is complete. + * * @owner_info: Information on owner for set being unloaded. */ int cscfg_unload_config_sets(struct cscfg_load_owner_info *owner_info) @@ -551,6 +660,13 @@ int cscfg_unload_config_sets(struct cscfg_load_owner_info *owner_info) struct cscfg_load_owner_info *load_list_item = NULL; mutex_lock(&cscfg_mutex); + if (cscfg_mgr->load_state != CSCFG_NONE) { + mutex_unlock(&cscfg_mutex); + return -EBUSY; + } + + /* unload op in progress also prevents activation of any config */ + cscfg_mgr->load_state = CSCFG_UNLOAD; /* cannot unload if anything is active */ if (atomic_read(&cscfg_mgr->sys_active_cnt)) { @@ -571,7 +687,12 @@ int cscfg_unload_config_sets(struct cscfg_load_owner_info *owner_info) goto exit_unlock; } - /* unload all belonging to load_owner */ + /* remove from configfs - again outside the scope of the list mutex */ + mutex_unlock(&cscfg_mutex); + cscfg_fs_unregister_cfgs_feats(owner_info); + mutex_lock(&cscfg_mutex); + + /* unload everything from lists belonging to load_owner */ cscfg_unload_owned_cfgs_feats(owner_info); /* remove from load order list */ @@ -582,6 +703,7 @@ int cscfg_unload_config_sets(struct cscfg_load_owner_info *owner_info) list_del(&owner_info->item); exit_unlock: + cscfg_mgr->load_state = CSCFG_NONE; mutex_unlock(&cscfg_mutex); return err; } @@ -759,8 +881,15 @@ static int _cscfg_activate_config(unsigned long cfg_hash) struct cscfg_config_desc *config_desc; int err = -EINVAL; + if (cscfg_mgr->load_state == CSCFG_UNLOAD) + return -EBUSY; + list_for_each_entry(config_desc, &cscfg_mgr->config_desc_list, item) { if ((unsigned long)config_desc->event_ea->var == cfg_hash) { + /* if we happen upon a partly loaded config, can't use it */ + if (config_desc->available == false) + return -EBUSY; + /* must ensure that config cannot be unloaded in use */ err = cscfg_owner_get(config_desc->load_owner); if (err) @@ -1022,8 +1151,10 @@ struct device *cscfg_device(void) /* Must have a release function or the kernel will complain on module unload */ static void cscfg_dev_release(struct device *dev) { + mutex_lock(&cscfg_mutex); kfree(cscfg_mgr); cscfg_mgr = NULL; + mutex_unlock(&cscfg_mutex); } /* a device is needed to "own" some kernel elements such as sysfs entries. */ @@ -1042,6 +1173,14 @@ static int cscfg_create_device(void) if (!cscfg_mgr) goto create_dev_exit_unlock; + /* initialise the cscfg_mgr structure */ + INIT_LIST_HEAD(&cscfg_mgr->csdev_desc_list); + INIT_LIST_HEAD(&cscfg_mgr->feat_desc_list); + INIT_LIST_HEAD(&cscfg_mgr->config_desc_list); + INIT_LIST_HEAD(&cscfg_mgr->load_order_list); + atomic_set(&cscfg_mgr->sys_active_cnt, 0); + cscfg_mgr->load_state = CSCFG_NONE; + /* setup the device */ dev = cscfg_device(); dev->release = cscfg_dev_release; @@ -1056,17 +1195,73 @@ create_dev_exit_unlock: return err; } -static void cscfg_clear_device(void) +/* + * Loading and unloading is generally on user discretion. + * If exiting due to coresight module unload, we need to unload any configurations that remain, + * before we unregister the configfs intrastructure. + * + * Do this by walking the load_owner list and taking appropriate action, depending on the load + * owner type. + */ +static void cscfg_unload_cfgs_on_exit(void) { - struct cscfg_config_desc *cfg_desc; + struct cscfg_load_owner_info *owner_info = NULL; + /* + * grab the mutex - even though we are exiting, some configfs files + * may still be live till we dump them, so ensure list data is + * protected from a race condition. + */ mutex_lock(&cscfg_mutex); - list_for_each_entry(cfg_desc, &cscfg_mgr->config_desc_list, item) { - etm_perf_del_symlink_cscfg(cfg_desc); + while (!list_empty(&cscfg_mgr->load_order_list)) { + + /* remove in reverse order of loading */ + owner_info = list_last_entry(&cscfg_mgr->load_order_list, + struct cscfg_load_owner_info, item); + + /* action according to type */ + switch (owner_info->type) { + case CSCFG_OWNER_PRELOAD: + /* + * preloaded descriptors are statically allocated in + * this module - just need to unload dynamic items from + * csdev lists, and remove from configfs directories. + */ + pr_info("cscfg: unloading preloaded configurations\n"); + break; + + case CSCFG_OWNER_MODULE: + /* + * this is an error - the loadable module must have been unloaded prior + * to the coresight module unload. Therefore that module has not + * correctly unloaded configs in its own exit code. + * Nothing to do other than emit an error string as the static descriptor + * references we need to unload will have disappeared with the module. + */ + pr_err("cscfg: ERROR: prior module failed to unload configuration\n"); + goto list_remove; + } + + /* remove from configfs - outside the scope of the list mutex */ + mutex_unlock(&cscfg_mutex); + cscfg_fs_unregister_cfgs_feats(owner_info); + mutex_lock(&cscfg_mutex); + + /* Next unload from csdev lists. */ + cscfg_unload_owned_cfgs_feats(owner_info); + +list_remove: + /* remove from load order list */ + list_del(&owner_info->item); } + mutex_unlock(&cscfg_mutex); +} + +static void cscfg_clear_device(void) +{ + cscfg_unload_cfgs_on_exit(); cscfg_configfs_release(cscfg_mgr); device_unregister(cscfg_device()); - mutex_unlock(&cscfg_mutex); } /* Initialise system config management API device */ @@ -1074,20 +1269,16 @@ int __init cscfg_init(void) { int err = 0; + /* create the device and init cscfg_mgr */ err = cscfg_create_device(); if (err) return err; + /* initialise configfs subsystem */ err = cscfg_configfs_init(cscfg_mgr); if (err) goto exit_err; - INIT_LIST_HEAD(&cscfg_mgr->csdev_desc_list); - INIT_LIST_HEAD(&cscfg_mgr->feat_desc_list); - INIT_LIST_HEAD(&cscfg_mgr->config_desc_list); - INIT_LIST_HEAD(&cscfg_mgr->load_order_list); - atomic_set(&cscfg_mgr->sys_active_cnt, 0); - /* preload built-in configurations */ err = cscfg_preload(THIS_MODULE); if (err) diff --git a/drivers/hwtracing/coresight/coresight-syscfg.h b/drivers/hwtracing/coresight/coresight-syscfg.h index 9106ffab4833..66e2db890d82 100644 --- a/drivers/hwtracing/coresight/coresight-syscfg.h +++ b/drivers/hwtracing/coresight/coresight-syscfg.h @@ -12,6 +12,17 @@ #include "coresight-config.h" +/* + * Load operation types. + * When loading or unloading, another load operation cannot be run. + * When unloading configurations cannot be activated. + */ +enum cscfg_load_ops { + CSCFG_NONE, + CSCFG_LOAD, + CSCFG_UNLOAD +}; + /** * System configuration manager device. * @@ -30,6 +41,7 @@ * @cfgfs_subsys: configfs subsystem used to manage configurations. * @sysfs_active_config:Active config hash used if CoreSight controlled from sysfs. * @sysfs_active_preset:Active preset index used if CoreSight controlled from sysfs. + * @load_state: A multi-stage load/unload operation is in progress. */ struct cscfg_manager { struct device dev; @@ -41,6 +53,7 @@ struct cscfg_manager { struct configfs_subsystem cfgfs_subsys; u32 sysfs_active_config; int sysfs_active_preset; + enum cscfg_load_ops load_state; }; /* get reference to dev in cscfg_manager */ |