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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Coresight system configuration driver.
*/
#ifndef CORESIGHT_SYSCFG_H
#define CORESIGHT_SYSCFG_H
#include <linux/configfs.h>
#include <linux/coresight.h>
#include <linux/device.h>
#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.
*
* Contains lists of the loaded configurations and features, plus a list of CoreSight devices
* registered with the system as supporting configuration management.
*
* Need a device to 'own' some coresight system wide sysfs entries in
* perf events, configfs etc.
*
* @dev: The device.
* @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.
* @load_order_list: Ordered list of owners for dynamically loaded configurations.
* @sys_active_cnt: Total number of active config descriptor references.
* @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;
struct list_head csdev_desc_list;
struct list_head feat_desc_list;
struct list_head config_desc_list;
struct list_head load_order_list;
atomic_t sys_active_cnt;
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 */
struct device *cscfg_device(void);
/**
* List entry for Coresight devices that are registered as supporting complex
* config operations.
*
* @csdev: The registered device.
* @match_flags: The matching type information for adding features.
* @ops: Operations supported by the registered device.
* @item: list entry.
*/
struct cscfg_registered_csdev {
struct coresight_device *csdev;
u32 match_flags;
struct cscfg_csdev_feat_ops ops;
struct list_head item;
};
/* owner types for loading and unloading of config and feature sets */
enum cscfg_load_owner_type {
CSCFG_OWNER_PRELOAD,
CSCFG_OWNER_MODULE,
};
/**
* Load item - item to add to the load order list allowing dynamic load and
* unload of configurations and features. Caller loading a config
* set provides a context handle for unload. API ensures that
* items unloaded strictly in reverse order from load to ensure
* dependencies are respected.
*
* @item: list entry for load order list.
* @type: type of owner - allows interpretation of owner_handle.
* @owner_handle: load context - handle for owner of loaded configs.
*/
struct cscfg_load_owner_info {
struct list_head item;
int type;
void *owner_handle;
};
/* internal core operations for cscfg */
int __init cscfg_init(void);
void cscfg_exit(void);
int cscfg_preload(void *owner_handle);
const struct cscfg_feature_desc *cscfg_get_named_feat_desc(const char *name);
int cscfg_update_feat_param_val(struct cscfg_feature_desc *feat_desc,
int param_idx, u64 value);
int cscfg_config_sysfs_activate(struct cscfg_config_desc *cfg_desc, bool activate);
void cscfg_config_sysfs_set_preset(int preset);
/* syscfg manager external API */
int cscfg_load_config_sets(struct cscfg_config_desc **cfg_descs,
struct cscfg_feature_desc **feat_descs,
struct cscfg_load_owner_info *owner_info);
int cscfg_unload_config_sets(struct cscfg_load_owner_info *owner_info);
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);
void cscfg_config_sysfs_get_active_cfg(unsigned long *cfg_hash, int *preset);
#endif /* CORESIGHT_SYSCFG_H */
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