@@ -4,7 +4,7 @@
#
obj-$(CONFIG_CORESIGHT) += coresight.o
coresight-y := coresight-core.o coresight-etm-perf.o coresight-platform.o \
- coresight-sysfs.o
+ coresight-sysfs.o coresight-syscfg.o
obj-$(CONFIG_CORESIGHT_LINK_AND_SINK_TMC) += coresight-tmc.o
coresight-tmc-y := coresight-tmc-core.o coresight-tmc-etf.o \
coresight-tmc-etr.o
new file mode 100644
@@ -0,0 +1,142 @@
+/* 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.
+ */
+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;
+};
+
+/**
+ * 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.
+ *
+ */
+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 */
+};
+
+#endif /* _CORESIGHT_CORESIGHT_CONFIG_H */
@@ -21,6 +21,7 @@
#include "coresight-etm-perf.h"
#include "coresight-priv.h"
+#include "coresight-syscfg.h"
static DEFINE_MUTEX(coresight_mutex);
static DEFINE_PER_CPU(struct coresight_device *, csdev_sink);
@@ -1763,13 +1764,22 @@ static int __init coresight_init(void)
ret = etm_perf_init();
if (ret)
- bus_unregister(&coresight_bustype);
+ goto exit_bus_unregister;
+ /* initialise the coresight syscfg API */
+ ret = cscfg_init();
+ if (!ret)
+ return 0;
+
+ etm_perf_exit();
+exit_bus_unregister:
+ bus_unregister(&coresight_bustype);
return ret;
}
static void __exit coresight_exit(void)
{
+ cscfg_exit();
etm_perf_exit();
bus_unregister(&coresight_bustype);
}
@@ -748,7 +748,7 @@ int __init etm_perf_init(void)
return ret;
}
-void __exit etm_perf_exit(void)
+void etm_perf_exit(void)
{
perf_pmu_unregister(&etm_pmu);
}
@@ -83,6 +83,6 @@ static inline void *etm_perf_sink_config(struct perf_output_handle *handle)
#endif /* CONFIG_CORESIGHT */
int __init etm_perf_init(void);
-void __exit etm_perf_exit(void);
+void etm_perf_exit(void);
#endif
new file mode 100644
@@ -0,0 +1,199 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2020 Linaro Limited, All rights reserved.
+ * Author: Mike Leach <mike.leach@linaro.org>
+ */
+
+#include <linux/platform_device.h>
+
+#include "coresight-config.h"
+#include "coresight-syscfg.h"
+
+/*
+ * cscfg_ API manages configurations and features for the entire coresight
+ * infrastructure.
+ *
+ * It allows the loading of configurations and features, and loads these into
+ * coresight devices as appropriate.
+ */
+
+/* protect the cscsg_data and device */
+static DEFINE_MUTEX(cscfg_mutex);
+
+/* only one of these */
+static struct cscfg_manager *cscfg_mgr;
+
+/* load features and configuations into the lists */
+
+/* check feature list for a named feature - call with mutex locked. */
+static bool cscfg_match_list_feat(const char *name)
+{
+ struct cscfg_feature_desc *feat_desc;
+
+ list_for_each_entry(feat_desc, &cscfg_mgr->feat_desc_list, item) {
+ if (strcmp(feat_desc->name, name) == 0)
+ return true;
+ }
+ return false;
+}
+
+/* check all feat needed for cfg are in the list - call with mutex locked. */
+static int cscfg_check_feat_for_cfg(struct cscfg_config_desc *config_desc)
+{
+ int i;
+
+ for (i = 0; i < config_desc->nr_feat_refs; i++)
+ if (!cscfg_match_list_feat(config_desc->feat_ref_names[i]))
+ return -EINVAL;
+ return 0;
+}
+
+/*
+ * load feature - add to feature list.
+ */
+static int cscfg_load_feat(struct cscfg_feature_desc *feat_desc)
+{
+ list_add(&feat_desc->item, &cscfg_mgr->feat_desc_list);
+
+ return 0;
+}
+
+/*
+ * load config into the system - validate used features exist then add to
+ * config list.
+ */
+static int cscfg_load_config(struct cscfg_config_desc *config_desc)
+{
+ int err;
+
+ /* validate features are present */
+ err = cscfg_check_feat_for_cfg(config_desc);
+ if (err)
+ return err;
+
+ list_add(&config_desc->item, &cscfg_mgr->config_desc_list);
+ return 0;
+}
+
+/**
+ * cscfg_load_config_sets - API function to load feature and config sets.
+ *
+ * Take a 0 terminated array of feature descriptors and/or configuration
+ * descriptors and load into the system.
+ * Features are loaded first to ensure configuration dependencies can be met.
+ *
+ * @config_descs: 0 terminated array of configuration descriptors.
+ * @feat_descs: 0 terminated array of feature descriptors.
+ */
+int cscfg_load_config_sets(struct cscfg_config_desc **config_descs,
+ struct cscfg_feature_desc **feat_descs)
+{
+ int err, i = 0;
+
+ mutex_lock(&cscfg_mutex);
+
+ /* load features first */
+ if (feat_descs) {
+ while (feat_descs[i]) {
+ err = cscfg_load_feat(feat_descs[i]);
+ if (err) {
+ pr_err("coresight-syscfg: Failed to load feature %s\n",
+ feat_descs[i]->name);
+ goto exit_unlock;
+ }
+ i++;
+ }
+ }
+
+ /* next any configurations to check feature dependencies */
+ i = 0;
+ if (config_descs) {
+ while (config_descs[i]) {
+ err = cscfg_load_config(config_descs[i]);
+ if (err) {
+ pr_err("coresight-syscfg: Failed to load configuration %s\n",
+ config_descs[i]->name);
+ goto exit_unlock;
+ }
+ i++;
+ }
+ }
+
+exit_unlock:
+ mutex_unlock(&cscfg_mutex);
+ return err;
+}
+EXPORT_SYMBOL_GPL(cscfg_load_config_sets);
+
+/* Initialise system configuration management device. */
+
+struct device *cscfg_device(void)
+{
+ return cscfg_mgr ? &cscfg_mgr->dev : NULL;
+}
+
+/* Must have a release function or the kernel will complain on module unload */
+static void cscfg_dev_release(struct device *dev)
+{
+ kfree(cscfg_mgr);
+ cscfg_mgr = NULL;
+}
+
+/* a device is needed to "own" some kernel elements such as sysfs entries. */
+static int cscfg_create_device(void)
+{
+ struct device *dev;
+ int err = -ENOMEM;
+
+ mutex_lock(&cscfg_mutex);
+ if (cscfg_mgr) {
+ err = -EINVAL;
+ goto create_dev_exit_unlock;
+ }
+
+ cscfg_mgr = kzalloc(sizeof(struct cscfg_manager), GFP_KERNEL);
+ if (!cscfg_mgr)
+ goto create_dev_exit_unlock;
+
+ /* setup the device */
+ dev = cscfg_device();
+ dev->release = cscfg_dev_release;
+ dev->init_name = "cs_system_cfg";
+
+ err = device_register(dev);
+ if (err)
+ cscfg_dev_release(dev);
+
+create_dev_exit_unlock:
+ mutex_unlock(&cscfg_mutex);
+ return err;
+}
+
+static void cscfg_clear_device(void)
+{
+ mutex_lock(&cscfg_mutex);
+ device_unregister(cscfg_device());
+ mutex_unlock(&cscfg_mutex);
+}
+
+/* Initialise system config management API device */
+int __init cscfg_init(void)
+{
+ int err = 0;
+
+ err = cscfg_create_device();
+ if (err)
+ return err;
+
+ INIT_LIST_HEAD(&cscfg_mgr->csdev_desc_list);
+ INIT_LIST_HEAD(&cscfg_mgr->feat_desc_list);
+ INIT_LIST_HEAD(&cscfg_mgr->config_desc_list);
+
+ dev_info(cscfg_device(), "CoreSight Configuration manager initialised");
+ return 0;
+}
+
+void cscfg_exit(void)
+{
+ cscfg_clear_device();
+}
new file mode 100644
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Coresight system configuration driver.
+ */
+
+#ifndef CORESIGHT_SYSCFG_H
+#define CORESIGHT_SYSCFG_H
+
+#include <linux/coresight.h>
+#include <linux/device.h>
+
+#include "coresight-config.h"
+
+/**
+ * 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.
+ */
+struct cscfg_manager {
+ struct device dev;
+ struct list_head csdev_desc_list;
+ struct list_head feat_desc_list;
+ struct list_head config_desc_list;
+};
+
+/* get reference to dev in cscfg_manager */
+struct device *cscfg_device(void);
+
+/* internal core operations for cscfg */
+int __init cscfg_init(void);
+void cscfg_exit(void);
+
+/* syscfg manager external API */
+int cscfg_load_config_sets(struct cscfg_config_desc **cfg_descs,
+ struct cscfg_feature_desc **feat_descs);
+
+#endif /* CORESIGHT_SYSCFG_H */