/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2020 Linaro Limited, All rights reserved.
* Author: Mike Leach <mike.leach@linaro.org>
*/
#ifndef _CORESIGHT_CORESIGHT_CONFIG_H
#define _CORESIGHT_CORESIGHT_CONFIG_H
#include <linux/coresight.h>
#include <linux/types.h>
/* CoreSight Configuration Management - component and system wide configuration */
/*
* Register type flags for register value descriptor:
* describe how the value is interpreted, and handled.
*/
#define CS_CFG_REG_TYPE_STD 0x80 /* reg is standard reg */
#define CS_CFG_REG_TYPE_RESOURCE 0x40 /* reg is a resource */
#define CS_CFG_REG_TYPE_VAL_PARAM 0x08 /* reg value uses param */
#define CS_CFG_REG_TYPE_VAL_MASK 0x04 /* reg value bit masked */
#define CS_CFG_REG_TYPE_VAL_64BIT 0x02 /* reg value 64 bit */
#define CS_CFG_REG_TYPE_VAL_SAVE 0x01 /* reg value save on disable */
/*
* flags defining what device class a feature will match to when processing a
* system configuration - used by config data and devices.
*/
#define CS_CFG_MATCH_CLASS_SRC_ALL 0x0001 /* match any source */
#define CS_CFG_MATCH_CLASS_SRC_ETM4 0x0002 /* match any ETMv4 device */
/* flags defining device instance matching - used in config match desc data. */
#define CS_CFG_MATCH_INST_ANY 0x80000000 /* any instance of a class */
/*
* Limit number of presets in a configuration
* This is related to the number of bits (4) we use to select the preset on
* the perf command line. Preset 0 is always none selected.
* See PMU_FORMAT_ATTR(preset, "config:0-3") in coresight-etm-perf.c
*/
#define CS_CFG_CONFIG_PRESET_MAX 15
/**
* Parameter descriptor for a device feature.
*
* @name: Name of parameter.
* @value: Initial or default value.
*/
struct cscfg_parameter_desc {
const char *name;
u64 value;
};
/**
* Representation of register value and a descriptor of register usage.
*
* Used as a descriptor in the feature descriptors.
* Used as a value in when in a feature loading into a csdev.
*
* Supports full 64 bit register value, or 32 bit value with optional mask
* value.
*
* @type: define register usage and interpretation.
* @offset: the address offset for register in the hardware device (per device specification).
* @hw_info: optional hardware device type specific information. (ETM / CTI specific etc)
* @val64: 64 bit value.
* @val32: 32 bit value.
* @mask32: 32 bit mask when using 32 bit value to access device register - if mask type.
* @param_idx: parameter index value into parameter array if param type.
*/
struct cscfg_regval_desc {
struct {
u32 type:8;
u32 offset:12;
u32 hw_info:12;
};
union {
u64 val64;
struct {
u32 val32;
u32 mask32;
};
u32 param_idx;
};
};
/**
* Device feature descriptor - combination of registers and parameters to
* program a device to implement a specific complex function.
*
* @name: feature name.
* @description: brief description of the feature.
* @item: List entry.
* @match_flags: matching information if loading into a device
* @nr_params: number of parameters used.
* @params_desc: array of parameters used.
* @nr_regs: number of registers used.
* @regs_desc: array of registers used.
* @load_owner: handle to load owner for dynamic load and unload of features.
* @fs_group: reference to configfs group for dynamic unload.
*/
struct cscfg_feature_desc {
const char *name;
const char *description;
struct list_head item;
u32 match_flags;
int nr_params;
struct cscfg_parameter_desc *params_desc;
int nr_regs;
struct cscfg_regval_desc *regs_desc;
void *load_owner;
struct config_group *fs_group;
};
/**
* Configuration descriptor - describes selectable system configuration.
*
* A configuration describes device features in use, and may provide preset
* values for the parameters in those features.
*
* A single set of presets is the sum of the parameters declared by
* all the features in use - this value is @nr_total_params.
*
* @name: name of the configuration - used for selection.
* @description: description of the purpose of the configuration.
* @item: list entry.
* @nr_feat_refs: Number of features used in this configuration.
* @feat_ref_names: references to features used in this configuration.
* @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.
* @event_ea: Extended attribute for perf event value
* @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;
const char *description;
struct list_head item;
int nr_feat_refs;
const char **feat_ref_names;
int nr_presets;
int nr_total_params;
const u64 *presets; /* nr_presets * nr_total_params */
struct dev_ext_attribute *event_ea;
atomic_t active_cnt;
void *load_owner;
struct config_group *fs_group;
bool available;
};
/**
* config register instance - part of a loaded feature.
* maps register values to csdev driver structures
*
* @reg_desc: value to use when setting feature on device / store for
* readback of volatile values.
* @driver_regval: pointer to internal driver element used to set the value
* in hardware.
*/
struct cscfg_regval_csdev {
struct cscfg_regval_desc reg_desc;
void *driver_regval;
};
/**
* config parameter instance - part of a loaded feature.
*
* @feat_csdev: parent feature
* @reg_csdev: register value updated by this parameter.
* @current_value: current value of parameter - may be set by user via
* sysfs, or modified during device operation.
* @val64: true if 64 bit value
*/
struct cscfg_parameter_csdev {
struct cscfg_feature_csdev *feat_csdev;
struct cscfg_regval_csdev *reg_csdev;
u64 current_value;
bool val64;
};
/**
* Feature instance loaded into a CoreSight device.
*
* When a feature is loaded into a specific device, then this structure holds
* the connections between the register / parameter values used and the
* internal data structures that are written when the feature is enabled.
*
* Since applying a feature modifies internal data structures in the device,
* then we have a reference to the device spinlock to protect access to these
* structures (@drv_spinlock).
*
* @feat_desc: pointer to the static descriptor for this feature.
* @csdev: parent CoreSight device instance.
* @node: list entry into feature list for this device.
* @drv_spinlock: device spinlock for access to driver register data.
* @nr_params: number of parameters.
* @params_csdev: current parameter values on this device
* @nr_regs: number of registers to be programmed.
* @regs_csdev: Programming details for the registers
*/
struct cscfg_feature_csdev {
const struct cscfg_feature_desc *feat_desc;
struct coresight_device *csdev;
struct list_head node;
spinlock_t *drv_spinlock;
int nr_params;
struct cscfg_parameter_csdev *params_csdev;
int nr_regs;
struct cscfg_regval_csdev *regs_csdev;
};
/**
* Configuration instance when loaded into a CoreSight device.
*
* The instance contains references to loaded features on this device that are
* used by the configuration.
*
* @config_desc:reference to the descriptor for this configuration
* @csdev: parent coresight device for this configuration instance.
* @enabled: true if configuration is enabled on this device.
* @node: list entry within the coresight device
* @nr_feat: Number of features on this device that are used in the
* configuration.
* @feats_csdev:references to the device features to enable.
*/
struct cscfg_config_csdev {
const struct cscfg_config_desc *config_desc;
struct coresight_device *csdev;
bool enabled;
struct list_head node;
int nr_feat;
struct cscfg_feature_csdev *feats_csdev[];
};
/**
* Coresight device operations.
*
* Registered coresight devices provide these operations to manage feature
* instances compatible with the device hardware and drivers
*
* @load_feat: Pass a feature descriptor into the device and create the
* loaded feature instance (struct cscfg_feature_csdev).
*/
struct cscfg_csdev_feat_ops {
int (*load_feat)(struct coresight_device *csdev,
struct cscfg_feature_csdev *feat_csdev);
};
/* coresight config helper functions*/
/* enable / disable config on a device - called with appropriate locks set.*/
int cscfg_csdev_enable_config(struct cscfg_config_csdev *config_csdev, int preset);
void cscfg_csdev_disable_config(struct cscfg_config_csdev *config_csdev);
/* reset a feature to default values */
void cscfg_reset_feat(struct cscfg_feature_csdev *feat_csdev);
#endif /* _CORESIGHT_CORESIGHT_CONFIG_H */