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A System Trace Module (STM) is a device exporting data in System Trace Protocol (STP) format as defined by MIPI STP standards. Examples of such devices are Intel(R) Trace Hub and Coresight STM. This abstraction provides a unified interface for software trace sources to send their data over an STM device to a debug host. In order to do that, such a trace source needs to be assigned a pair of master/channel identifiers that all the data from this source will be tagged with. The STP decoder on the debug host side will use these master/channel tags to distinguish different trace streams from one another inside one STP stream. This abstraction provides a configfs-based policy management mechanism for dynamic allocation of these master/channel pairs based on trace source-supplied string identifier. It has the flexibility of being defined at runtime and at the same time (provided that the policy definition is aligned with the decoding end) consistency. For userspace trace sources, this abstraction provides write()-based and mmap()-based (if the underlying stm device allows this) output mechanism. For kernel-side trace sources, we provide "stm_source" device class that can be connected to an stm device at run time. Cc: linux-api@vger.kernel.org Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/*
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* System Trace Module (STM) infrastructure
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* Copyright (c) 2014, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* STM class implements generic infrastructure for System Trace Module devices
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* as defined in MIPI STPv2 specification.
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*/
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#ifndef _STM_STM_H_
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#define _STM_STM_H_
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struct stp_policy;
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struct stp_policy_node;
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struct stp_policy_node *
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stp_policy_node_lookup(struct stm_device *stm, char *s);
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void stp_policy_node_put(struct stp_policy_node *policy_node);
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void stp_policy_unbind(struct stp_policy *policy);
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void stp_policy_node_get_ranges(struct stp_policy_node *policy_node,
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unsigned int *mstart, unsigned int *mend,
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unsigned int *cstart, unsigned int *cend);
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int stp_configfs_init(void);
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void stp_configfs_exit(void);
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struct stp_master {
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unsigned int nr_free;
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unsigned long chan_map[0];
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};
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struct stm_device {
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struct device dev;
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struct module *owner;
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struct stp_policy *policy;
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struct mutex policy_mutex;
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int major;
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unsigned int sw_nmasters;
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struct stm_data *data;
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spinlock_t link_lock;
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struct list_head link_list;
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/* master allocation */
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spinlock_t mc_lock;
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struct stp_master *masters[0];
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};
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#define to_stm_device(_d) \
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container_of((_d), struct stm_device, dev)
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struct stm_output {
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unsigned int master;
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unsigned int channel;
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unsigned int nr_chans;
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};
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struct stm_file {
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struct stm_device *stm;
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struct stp_policy_node *policy_node;
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struct stm_output output;
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};
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struct stm_device *stm_find_device(const char *name);
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void stm_put_device(struct stm_device *stm);
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struct stm_source_device {
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struct device dev;
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struct stm_source_data *data;
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spinlock_t link_lock;
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struct stm_device *link;
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struct list_head link_entry;
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/* one output per stm_source device */
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struct stp_policy_node *policy_node;
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struct stm_output output;
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};
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#define to_stm_source_device(_d) \
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container_of((_d), struct stm_source_device, dev)
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#endif /* _STM_STM_H_ */
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