/* 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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