1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (c) 2020 Linaro Limited, All rights reserved.
4 * Author: Mike Leach <mike.leach@linaro.org>
5 */
6
7#ifndef _CORESIGHT_CORESIGHT_CONFIG_H
8#define _CORESIGHT_CORESIGHT_CONFIG_H
9
10#include <linux/coresight.h>
11#include <linux/types.h>
12
13/* CoreSight Configuration Management - component and system wide configuration */
14
15/*
16 * Register type flags for register value descriptor:
17 * describe how the value is interpreted, and handled.
18 */
19#define CS_CFG_REG_TYPE_STD 0x80 /* reg is standard reg */
20#define CS_CFG_REG_TYPE_RESOURCE 0x40 /* reg is a resource */
21#define CS_CFG_REG_TYPE_VAL_PARAM 0x08 /* reg value uses param */
22#define CS_CFG_REG_TYPE_VAL_MASK 0x04 /* reg value bit masked */
23#define CS_CFG_REG_TYPE_VAL_64BIT 0x02 /* reg value 64 bit */
24#define CS_CFG_REG_TYPE_VAL_SAVE 0x01 /* reg value save on disable */
25
26/*
27 * flags defining what device class a feature will match to when processing a
28 * system configuration - used by config data and devices.
29 */
30#define CS_CFG_MATCH_CLASS_SRC_ALL 0x0001 /* match any source */
31#define CS_CFG_MATCH_CLASS_SRC_ETM4 0x0002 /* match any ETMv4 device */
32
33/* flags defining device instance matching - used in config match desc data. */
34#define CS_CFG_MATCH_INST_ANY 0x80000000 /* any instance of a class */
35
36/*
37 * Limit number of presets in a configuration
38 * This is related to the number of bits (4) we use to select the preset on
39 * the perf command line. Preset 0 is always none selected.
40 * See PMU_FORMAT_ATTR(preset, "config:0-3") in coresight-etm-perf.c
41 */
42#define CS_CFG_CONFIG_PRESET_MAX 15
43
44/**
45 * Parameter descriptor for a device feature.
46 *
47 * @name: Name of parameter.
48 * @value: Initial or default value.
49 */
50struct cscfg_parameter_desc {
51 const char *name;
52 u64 value;
53};
54
55/**
56 * Representation of register value and a descriptor of register usage.
57 *
58 * Used as a descriptor in the feature descriptors.
59 * Used as a value in when in a feature loading into a csdev.
60 *
61 * Supports full 64 bit register value, or 32 bit value with optional mask
62 * value.
63 *
64 * @type: define register usage and interpretation.
65 * @offset: the address offset for register in the hardware device (per device specification).
66 * @hw_info: optional hardware device type specific information. (ETM / CTI specific etc)
67 * @val64: 64 bit value.
68 * @val32: 32 bit value.
69 * @mask32: 32 bit mask when using 32 bit value to access device register - if mask type.
70 * @param_idx: parameter index value into parameter array if param type.
71 */
72struct cscfg_regval_desc {
73 struct {
74 u32 type:8;
75 u32 offset:12;
76 u32 hw_info:12;
77 };
78 union {
79 u64 val64;
80 struct {
81 u32 val32;
82 u32 mask32;
83 };
84 u32 param_idx;
85 };
86};
87
88/**
89 * Device feature descriptor - combination of registers and parameters to
90 * program a device to implement a specific complex function.
91 *
92 * @name: feature name.
93 * @description: brief description of the feature.
94 * @item: List entry.
95 * @match_flags: matching information if loading into a device
96 * @nr_params: number of parameters used.
97 * @params_desc: array of parameters used.
98 * @nr_regs: number of registers used.
99 * @regs_desc: array of registers used.
100 * @load_owner: handle to load owner for dynamic load and unload of features.
101 * @fs_group: reference to configfs group for dynamic unload.
102 */
103struct cscfg_feature_desc {
104 const char *name;
105 const char *description;
106 struct list_head item;
107 u32 match_flags;
108 int nr_params;
109 struct cscfg_parameter_desc *params_desc;
110 int nr_regs;
111 struct cscfg_regval_desc *regs_desc;
112 void *load_owner;
113 struct config_group *fs_group;
114};
115
116/**
117 * Configuration descriptor - describes selectable system configuration.
118 *
119 * A configuration describes device features in use, and may provide preset
120 * values for the parameters in those features.
121 *
122 * A single set of presets is the sum of the parameters declared by
123 * all the features in use - this value is @nr_total_params.
124 *
125 * @name: name of the configuration - used for selection.
126 * @description: description of the purpose of the configuration.
127 * @item: list entry.
128 * @nr_feat_refs: Number of features used in this configuration.
129 * @feat_ref_names: references to features used in this configuration.
130 * @nr_presets: Number of sets of presets supplied by this configuration.
131 * @nr_total_params: Sum of all parameters declared by used features
132 * @presets: Array of preset values.
133 * @event_ea: Extended attribute for perf event value
134 * @active_cnt: ref count for activate on this configuration.
135 * @load_owner: handle to load owner for dynamic load and unload of configs.
136 * @fs_group: reference to configfs group for dynamic unload.
137 * @available: config can be activated - multi-stage load sets true on completion.
138 */
139struct cscfg_config_desc {
140 const char *name;
141 const char *description;
142 struct list_head item;
143 int nr_feat_refs;
144 const char **feat_ref_names;
145 int nr_presets;
146 int nr_total_params;
147 const u64 *presets; /* nr_presets * nr_total_params */
148 struct dev_ext_attribute *event_ea;
149 atomic_t active_cnt;
150 void *load_owner;
151 struct config_group *fs_group;
152 bool available;
153};
154
155/**
156 * config register instance - part of a loaded feature.
157 * maps register values to csdev driver structures
158 *
159 * @reg_desc: value to use when setting feature on device / store for
160 * readback of volatile values.
161 * @driver_regval: pointer to internal driver element used to set the value
162 * in hardware.
163 */
164struct cscfg_regval_csdev {
165 struct cscfg_regval_desc reg_desc;
166 void *driver_regval;
167};
168
169/**
170 * config parameter instance - part of a loaded feature.
171 *
172 * @feat_csdev: parent feature
173 * @reg_csdev: register value updated by this parameter.
174 * @current_value: current value of parameter - may be set by user via
175 * sysfs, or modified during device operation.
176 * @val64: true if 64 bit value
177 */
178struct cscfg_parameter_csdev {
179 struct cscfg_feature_csdev *feat_csdev;
180 struct cscfg_regval_csdev *reg_csdev;
181 u64 current_value;
182 bool val64;
183};
184
185/**
186 * Feature instance loaded into a CoreSight device.
187 *
188 * When a feature is loaded into a specific device, then this structure holds
189 * the connections between the register / parameter values used and the
190 * internal data structures that are written when the feature is enabled.
191 *
192 * Since applying a feature modifies internal data structures in the device,
193 * then we have a reference to the device spinlock to protect access to these
194 * structures (@drv_spinlock).
195 *
196 * @feat_desc: pointer to the static descriptor for this feature.
197 * @csdev: parent CoreSight device instance.
198 * @node: list entry into feature list for this device.
199 * @drv_spinlock: device spinlock for access to driver register data.
200 * @nr_params: number of parameters.
201 * @params_csdev: current parameter values on this device
202 * @nr_regs: number of registers to be programmed.
203 * @regs_csdev: Programming details for the registers
204 */
205struct cscfg_feature_csdev {
206 const struct cscfg_feature_desc *feat_desc;
207 struct coresight_device *csdev;
208 struct list_head node;
209 spinlock_t *drv_spinlock;
210 int nr_params;
211 struct cscfg_parameter_csdev *params_csdev;
212 int nr_regs;
213 struct cscfg_regval_csdev *regs_csdev;
214};
215
216/**
217 * Configuration instance when loaded into a CoreSight device.
218 *
219 * The instance contains references to loaded features on this device that are
220 * used by the configuration.
221 *
222 * @config_desc:reference to the descriptor for this configuration
223 * @csdev: parent coresight device for this configuration instance.
224 * @enabled: true if configuration is enabled on this device.
225 * @node: list entry within the coresight device
226 * @nr_feat: Number of features on this device that are used in the
227 * configuration.
228 * @feats_csdev:references to the device features to enable.
229 */
230struct cscfg_config_csdev {
231 const struct cscfg_config_desc *config_desc;
232 struct coresight_device *csdev;
233 bool enabled;
234 struct list_head node;
235 int nr_feat;
236 struct cscfg_feature_csdev *feats_csdev[];
237};
238
239/**
240 * Coresight device operations.
241 *
242 * Registered coresight devices provide these operations to manage feature
243 * instances compatible with the device hardware and drivers
244 *
245 * @load_feat: Pass a feature descriptor into the device and create the
246 * loaded feature instance (struct cscfg_feature_csdev).
247 */
248struct cscfg_csdev_feat_ops {
249 int (*load_feat)(struct coresight_device *csdev,
250 struct cscfg_feature_csdev *feat_csdev);
251};
252
253/* coresight config helper functions*/
254
255/* enable / disable config on a device - called with appropriate locks set.*/
256int cscfg_csdev_enable_config(struct cscfg_config_csdev *config_csdev, int preset);
257void cscfg_csdev_disable_config(struct cscfg_config_csdev *config_csdev);
258
259/* reset a feature to default values */
260void cscfg_reset_feat(struct cscfg_feature_csdev *feat_csdev);
261
262#endif /* _CORESIGHT_CORESIGHT_CONFIG_H */
263

source code of linux/drivers/hwtracing/coresight/coresight-config.h