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1 /*-
2  * Copyright (c) 2018-2020 Ruslan Bukin <br@bsdpad.com>
3  * All rights reserved.
4  *
5  * This software was developed by SRI International and the University of
6  * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
7  * ("CTSRD"), as part of the DARPA CRASH research programme.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/bus.h>
37 #include <sys/rman.h>
38 #include <sys/kernel.h>
39 #include <sys/module.h>
40 #include <machine/bus.h>
41
42 #include <arm64/coresight/coresight.h>
43
44 #include "coresight_if.h"
45
46 extern struct coresight_device_list cs_devs;
47
48 static struct coresight_device *
49 coresight_next_device(struct coresight_device *cs_dev,
50     struct coresight_event *event)
51 {
52         struct coresight_device *out;
53         struct endpoint *out_endp;
54         struct endpoint *endp;
55
56         TAILQ_FOREACH(endp, &cs_dev->pdata->endpoints, link) {
57                 if (endp->input != 0)
58                         continue;
59
60                 out = coresight_get_output_device(endp, &out_endp);
61                 if (out != NULL) {
62                         if (LIST_EMPTY(&event->endplist)) {
63                                 /* Add source device */
64                                 endp->cs_dev = cs_dev;
65                                 LIST_INSERT_HEAD(&event->endplist, endp,
66                                     endplink);
67                         }
68
69                         /* Add output device */
70                         if (bootverbose)
71                                 printf("Adding device %s to the chain\n",
72                                     device_get_nameunit(out->dev));
73                         out_endp->cs_dev = out;
74                         LIST_INSERT_HEAD(&event->endplist, out_endp, endplink);
75
76                         return (out);
77                 }
78         }
79
80         return (NULL);
81 }
82
83 static int
84 coresight_build_list(struct coresight_device *cs_dev,
85     struct coresight_event *event)
86 {
87         struct coresight_device *out;
88
89         out = cs_dev;
90         while (out != NULL)
91                 out = coresight_next_device(out, event);
92
93         return (0);
94 }
95
96 int
97 coresight_init_event(int cpu, struct coresight_event *event)
98 {
99         struct coresight_device *cs_dev;
100         struct endpoint *endp;
101
102         /* Start building path from source device */
103         TAILQ_FOREACH(cs_dev, &cs_devs, link) {
104                 if (cs_dev->dev_type == event->src &&
105                     cs_dev->pdata->cpu == cpu) {
106                         LIST_INIT(&event->endplist);
107                         coresight_build_list(cs_dev, event);
108                         break;
109                 }
110         }
111
112         /* Ensure Coresight is initialized for the CPU */
113         TAILQ_FOREACH(cs_dev, &cs_devs, link) {
114                 if (cs_dev->dev_type == CORESIGHT_CPU_DEBUG &&
115                     cs_dev->pdata->cpu == cpu)
116                         CORESIGHT_INIT(cs_dev->dev);
117         }
118
119         /* Init all devices in the path */
120         LIST_FOREACH(endp, &event->endplist, endplink) {
121                 cs_dev = endp->cs_dev;
122                 CORESIGHT_INIT(cs_dev->dev);
123         }
124
125         return (0);
126 }
127
128 void
129 coresight_enable(int cpu, struct coresight_event *event)
130 {
131         struct coresight_device *cs_dev;
132         struct endpoint *endp;
133
134         LIST_FOREACH(endp, &event->endplist, endplink) {
135                 cs_dev = endp->cs_dev;
136                 CORESIGHT_ENABLE(cs_dev->dev, endp, event);
137         }
138 }
139
140 void
141 coresight_disable(int cpu, struct coresight_event *event)
142 {
143         struct coresight_device *cs_dev;
144         struct endpoint *endp;
145
146         LIST_FOREACH(endp, &event->endplist, endplink) {
147                 cs_dev = endp->cs_dev;
148                 CORESIGHT_DISABLE(cs_dev->dev, endp, event);
149         }
150 }
151
152 void
153 coresight_read(int cpu, struct coresight_event *event)
154 {
155         struct endpoint *endp;
156
157         LIST_FOREACH(endp, &event->endplist, endplink)
158                 CORESIGHT_READ(endp->cs_dev->dev, endp, event);
159 }