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[68.147.0.187]) by smtp.gmail.com with ESMTPSA id s19sm18102890pfh.168.2021.03.29.12.54.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Mar 2021 12:54:41 -0700 (PDT) Date: Mon, 29 Mar 2021 13:54:38 -0600 From: Mathieu Poirier To: Mike Leach Cc: linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org, linux-doc@vger.kernel.org, suzuki.poulose@arm.com, yabinc@google.com, corbet@lwn.net, leo.yan@linaro.org, alexander.shishkin@linux.intel.com, tingwei@codeaurora.org, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v5 01/10] coresight: syscfg: Initial coresight system configuration Message-ID: <20210329195438.GD2236953@xps15> References: <20210316180400.7184-1-mike.leach@linaro.org> <20210316180400.7184-2-mike.leach@linaro.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210316180400.7184-2-mike.leach@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210329_205444_251749_9A349FD1 X-CRM114-Status: GOOD ( 51.17 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Good day, On Tue, Mar 16, 2021 at 06:03:51PM +0000, Mike Leach wrote: > Creates an system management API to allow complex configurations and > features to be programmed into a CoreSight infrastructure. > > A feature is defined as a programming set for a device or class of > devices. > > A configuration is a set of features across the system that are enabled > for a trace session. > > The API will manage system wide configuration, and allow complex > programmed features to be added to individual device instances, and > provide for system wide configuration selection on trace capture > operations. > > This patch creates the initial data object and the initial API for > loading configurations and features. > > Signed-off-by: Mike Leach > --- > drivers/hwtracing/coresight/Makefile | 2 +- > .../hwtracing/coresight/coresight-config.h | 142 +++++++++++++ > drivers/hwtracing/coresight/coresight-core.c | 12 +- > .../hwtracing/coresight/coresight-etm-perf.c | 2 +- > .../hwtracing/coresight/coresight-etm-perf.h | 2 +- > .../hwtracing/coresight/coresight-syscfg.c | 195 ++++++++++++++++++ > .../hwtracing/coresight/coresight-syscfg.h | 46 +++++ > 7 files changed, 397 insertions(+), 4 deletions(-) > create mode 100644 drivers/hwtracing/coresight/coresight-config.h > create mode 100644 drivers/hwtracing/coresight/coresight-syscfg.c > create mode 100644 drivers/hwtracing/coresight/coresight-syscfg.h > > diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile > index f20e357758d1..4ce854c434b1 100644 > --- a/drivers/hwtracing/coresight/Makefile > +++ b/drivers/hwtracing/coresight/Makefile > @@ -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 > diff --git a/drivers/hwtracing/coresight/coresight-config.h b/drivers/hwtracing/coresight/coresight-config.h > new file mode 100644 > index 000000000000..21aa7464dcdc > --- /dev/null > +++ b/drivers/hwtracing/coresight/coresight-config.h > @@ -0,0 +1,142 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * Copyright (c) 2020 Linaro Limited, All rights reserved. > + * Author: Mike Leach > + */ > + > +#ifndef _CORESIGHT_CORESIGHT_CONFIG_H > +#define _CORESIGHT_CORESIGHT_CONFIG_H > + > +#include > +#include > + > +/* 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 */ > diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c > index 0062c8935653..6bd41de46648 100644 > --- a/drivers/hwtracing/coresight/coresight-core.c > +++ b/drivers/hwtracing/coresight/coresight-core.c > @@ -21,6 +21,7 @@ > > #include "coresight-etm-perf.h" > #include "coresight-priv.h" > +#include "coresight-syscfg.h" > > static DEFINE_MUTEX(coresight_mutex); > > @@ -1739,13 +1740,22 @@ 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); > } > diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c > index 0f603b4094f2..0e392513b2d6 100644 > --- a/drivers/hwtracing/coresight/coresight-etm-perf.c > +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c > @@ -655,7 +655,7 @@ int __init etm_perf_init(void) > return ret; > } > > -void __exit etm_perf_exit(void) > +void etm_perf_exit(void) I'm guessing you need to do this because the linker script yelled at you for calling a function labelled with __exit in another one labelled with __init, i.e coresight_init() ? > { > perf_pmu_unregister(&etm_pmu); > } > diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.h b/drivers/hwtracing/coresight/coresight-etm-perf.h > index 3e4f2ad5e193..29d90dfeba31 100644 > --- a/drivers/hwtracing/coresight/coresight-etm-perf.h > +++ b/drivers/hwtracing/coresight/coresight-etm-perf.h > @@ -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 > diff --git a/drivers/hwtracing/coresight/coresight-syscfg.c b/drivers/hwtracing/coresight/coresight-syscfg.c > new file mode 100644 > index 000000000000..3e0ab4ac93fd > --- /dev/null > +++ b/drivers/hwtracing/coresight/coresight-syscfg.c > @@ -0,0 +1,195 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (c) 2020 Linaro Limited, All rights reserved. > + * Author: Mike Leach > + */ > + > +#include > + > +#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; > +} > + > +/* > + * External 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. > + */ > +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 */ > +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. */ > +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; > +} > + > +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(); > +} > diff --git a/drivers/hwtracing/coresight/coresight-syscfg.h b/drivers/hwtracing/coresight/coresight-syscfg.h > new file mode 100644 > index 000000000000..18be9b58cd0b > --- /dev/null > +++ b/drivers/hwtracing/coresight/coresight-syscfg.h > @@ -0,0 +1,46 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* > + * Coresight system configuration driver. > + */ > + > +#ifndef CORESIGHT_SYSCFG_H > +#define CORESIGHT_SYSCFG_H > + > +#include > +#include > + > +#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); > + Reviewed-by: Mathieu Poirier > +#endif /* CORESIGHT_SYSCFG_H */ > -- > 2.17.1 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel