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eb2ec49606
CoreSight configurations and features can be added as kernel loadable modules. This patch updates the load owner API to ensure that the module cannot be unloaded either: 1) if the config it supplies is in use 2) if the module is not the last in the load order list. Signed-off-by: Mike Leach <mike.leach@linaro.org> Link: https://lore.kernel.org/r/20211124200038.28662-4-mike.leach@linaro.org Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
109 lines
3.7 KiB
C
109 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Coresight system configuration driver.
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*/
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#ifndef CORESIGHT_SYSCFG_H
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#define CORESIGHT_SYSCFG_H
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#include <linux/configfs.h>
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#include <linux/coresight.h>
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#include <linux/device.h>
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#include "coresight-config.h"
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/**
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* System configuration manager device.
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*
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* Contains lists of the loaded configurations and features, plus a list of CoreSight devices
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* registered with the system as supporting configuration management.
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*
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* Need a device to 'own' some coresight system wide sysfs entries in
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* perf events, configfs etc.
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*
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* @dev: The device.
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* @csdev_desc_list: List of coresight devices registered with the configuration manager.
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* @feat_desc_list: List of feature descriptors to load into registered devices.
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* @config_desc_list: List of system configuration descriptors to load into registered devices.
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* @load_order_list: Ordered list of owners for dynamically loaded configurations.
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* @sys_active_cnt: Total number of active config descriptor references.
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* @cfgfs_subsys: configfs subsystem used to manage configurations.
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*/
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struct cscfg_manager {
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struct device dev;
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struct list_head csdev_desc_list;
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struct list_head feat_desc_list;
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struct list_head config_desc_list;
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struct list_head load_order_list;
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atomic_t sys_active_cnt;
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struct configfs_subsystem cfgfs_subsys;
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};
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/* get reference to dev in cscfg_manager */
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struct device *cscfg_device(void);
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/**
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* List entry for Coresight devices that are registered as supporting complex
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* config operations.
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*
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* @csdev: The registered device.
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* @match_flags: The matching type information for adding features.
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* @ops: Operations supported by the registered device.
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* @item: list entry.
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*/
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struct cscfg_registered_csdev {
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struct coresight_device *csdev;
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u32 match_flags;
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struct cscfg_csdev_feat_ops ops;
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struct list_head item;
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};
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/* owner types for loading and unloading of config and feature sets */
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enum cscfg_load_owner_type {
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CSCFG_OWNER_PRELOAD,
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CSCFG_OWNER_MODULE,
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};
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/**
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* Load item - item to add to the load order list allowing dynamic load and
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* unload of configurations and features. Caller loading a config
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* set provides a context handle for unload. API ensures that
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* items unloaded strictly in reverse order from load to ensure
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* dependencies are respected.
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*
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* @item: list entry for load order list.
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* @type: type of owner - allows interpretation of owner_handle.
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* @owner_handle: load context - handle for owner of loaded configs.
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*/
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struct cscfg_load_owner_info {
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struct list_head item;
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int type;
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void *owner_handle;
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};
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/* internal core operations for cscfg */
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int __init cscfg_init(void);
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void cscfg_exit(void);
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int cscfg_preload(void *owner_handle);
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const struct cscfg_feature_desc *cscfg_get_named_feat_desc(const char *name);
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int cscfg_update_feat_param_val(struct cscfg_feature_desc *feat_desc,
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int param_idx, u64 value);
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/* syscfg manager external API */
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int cscfg_load_config_sets(struct cscfg_config_desc **cfg_descs,
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struct cscfg_feature_desc **feat_descs,
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struct cscfg_load_owner_info *owner_info);
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int cscfg_unload_config_sets(struct cscfg_load_owner_info *owner_info);
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int cscfg_register_csdev(struct coresight_device *csdev, u32 match_flags,
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struct cscfg_csdev_feat_ops *ops);
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void cscfg_unregister_csdev(struct coresight_device *csdev);
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int cscfg_activate_config(unsigned long cfg_hash);
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void cscfg_deactivate_config(unsigned long cfg_hash);
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void cscfg_csdev_reset_feats(struct coresight_device *csdev);
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int cscfg_csdev_enable_active_config(struct coresight_device *csdev,
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unsigned long cfg_hash, int preset);
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void cscfg_csdev_disable_active_config(struct coresight_device *csdev);
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#endif /* CORESIGHT_SYSCFG_H */
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