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
89