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
  13 struct 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  */
  28 struct 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  */
  40 struct 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  */
  53 struct 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)
  61 int etm_perf_symlink(struct coresight_device *csdev, bool link);
  62 int etm_perf_add_symlink_sink(struct coresight_device *csdev);
  63 void etm_perf_del_symlink_sink(struct coresight_device *csdev);
  64 static 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
  73 static inline int etm_perf_symlink(struct coresight_device *csdev, bool link)
  74 { return -EINVAL; }
  75 int etm_perf_add_symlink_sink(struct coresight_device *csdev)
  76 { return -EINVAL; }
  77 void etm_perf_del_symlink_sink(struct coresight_device *csdev) {}
  78 static inline void *etm_perf_sink_config(struct perf_output_handle *handle)
  79 {
  80         return NULL;
  81 }
  82
  83 #endif /* CONFIG_CORESIGHT */
  84
  85 int __init etm_perf_init(void);
  86 void __exit etm_perf_exit(void);
  87
  88 #endif