LXR linux/drivers/hwtracing/coresight/coresight-etm-perf.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Copyright(C) 2015 Linaro Limited. All rights reserved.
   4 * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
   5 */
   6
   7#ifndef _CORESIGHT_ETM_PERF_H
   8#define _CORESIGHT_ETM_PERF_H
   9
  10#include <linux/percpu-defs.h>
  11#include "coresight-priv.h"
  12
  13struct coresight_device;
  14
  15/*
  16 * In both ETMv3 and v4 the maximum number of address comparator implentable
  17 * is 8.  The actual number is implementation specific and will be checked
  18 * when filters are applied.
  19 */
  20#define ETM_ADDR_CMP_MAX        8
  21
  22/**
  23 * struct etm_filter - single instruction range or start/stop configuration.
  24 * @start_addr: The address to start tracing on.
  25 * @stop_addr:  The address to stop tracing on.
  26 * @type:       Is this a range or start/stop filter.
  27 */
  28struct etm_filter {
  29        unsigned long start_addr;
  30        unsigned long stop_addr;
  31        enum etm_addr_type type;
  32};
  33
  34/**
  35 * struct etm_filters - set of filters for a session
  36 * @etm_filter: All the filters for this session.
  37 * @nr_filters: Number of filters
  38 * @ssstatus:   Status of the start/stop logic.
  39 */
  40struct etm_filters {
  41        struct etm_filter       etm_filter[ETM_ADDR_CMP_MAX];
  42        unsigned int            nr_filters;
  43        bool                    ssstatus;
  44};
  45
  46/**
  47 * struct etm_event_data - Coresight specifics associated to an event
  48 * @work:               Handle to free allocated memory outside IRQ context.
  49 * @mask:               Hold the CPU(s) this event was set for.
  50 * @snk_config:         The sink configuration.
  51 * @path:               An array of path, each slot for one CPU.
  52 */
  53struct etm_event_data {
  54        struct work_struct work;
  55        cpumask_t mask;
  56        void *snk_config;
  57        struct list_head * __percpu *path;
  58};
  59
  60#if IS_ENABLED(CONFIG_CORESIGHT)
  61int etm_perf_symlink(struct coresight_device *csdev, bool link);
  62int etm_perf_add_symlink_sink(struct coresight_device *csdev);
  63void etm_perf_del_symlink_sink(struct coresight_device *csdev);
  64static inline void *etm_perf_sink_config(struct perf_output_handle *handle)
  65{
  66        struct etm_event_data *data = perf_get_aux(handle);
  67
  68        if (data)
  69                return data->snk_config;
  70        return NULL;
  71}
  72#else
  73static inline int etm_perf_symlink(struct coresight_device *csdev, bool link)
  74{ return -EINVAL; }
  75int etm_perf_add_symlink_sink(struct coresight_device *csdev)
  76{ return -EINVAL; }
  77void etm_perf_del_symlink_sink(struct coresight_device *csdev) {}
  78static inline void *etm_perf_sink_config(struct perf_output_handle *handle)
  79{
  80        return NULL;
  81}
  82
  83#endif /* CONFIG_CORESIGHT */
  84
  85int __init etm_perf_init(void);
  86void __exit etm_perf_exit(void);
  87
  88#endif
  89