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 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/bus.h> 35 #include <sys/rman.h> 36 #include <sys/kernel.h> 37 #include <sys/module.h> 38 #include <machine/bus.h> 39 40 #include <arm64/coresight/coresight.h> 41 42 #include "coresight_if.h" 43 44 extern struct coresight_device_list cs_devs; 45 46 static struct coresight_device * 47 coresight_next_device(struct coresight_device *cs_dev, 48 struct coresight_event *event) 49 { 50 struct coresight_device *out; 51 struct endpoint *out_endp; 52 struct endpoint *endp; 53 54 TAILQ_FOREACH(endp, &cs_dev->pdata->endpoints, link) { 55 if (endp->input != 0) 56 continue; 57 58 out = coresight_get_output_device(endp, &out_endp); 59 if (out != NULL) { 60 if (LIST_EMPTY(&event->endplist)) { 61 /* Add source device */ 62 endp->cs_dev = cs_dev; 63 LIST_INSERT_HEAD(&event->endplist, endp, 64 endplink); 65 } 66 67 /* Add output device */ 68 if (bootverbose) 69 printf("Adding device %s to the chain\n", 70 device_get_nameunit(out->dev)); 71 out_endp->cs_dev = out; 72 LIST_INSERT_HEAD(&event->endplist, out_endp, endplink); 73 74 return (out); 75 } 76 } 77 78 return (NULL); 79 } 80 81 static int 82 coresight_build_list(struct coresight_device *cs_dev, 83 struct coresight_event *event) 84 { 85 struct coresight_device *out; 86 87 out = cs_dev; 88 while (out != NULL) 89 out = coresight_next_device(out, event); 90 91 return (0); 92 } 93 94 int 95 coresight_init_event(int cpu, struct coresight_event *event) 96 { 97 struct coresight_device *cs_dev; 98 struct endpoint *endp; 99 100 /* Start building path from source device */ 101 TAILQ_FOREACH(cs_dev, &cs_devs, link) { 102 if (cs_dev->dev_type == event->src && 103 cs_dev->pdata->cpu == cpu) { 104 LIST_INIT(&event->endplist); 105 coresight_build_list(cs_dev, event); 106 break; 107 } 108 } 109 110 /* Ensure Coresight is initialized for the CPU */ 111 TAILQ_FOREACH(cs_dev, &cs_devs, link) { 112 if (cs_dev->dev_type == CORESIGHT_CPU_DEBUG && 113 cs_dev->pdata->cpu == cpu) 114 CORESIGHT_INIT(cs_dev->dev); 115 } 116 117 /* Init all devices in the path */ 118 LIST_FOREACH(endp, &event->endplist, endplink) { 119 cs_dev = endp->cs_dev; 120 CORESIGHT_INIT(cs_dev->dev); 121 } 122 123 return (0); 124 } 125 126 void 127 coresight_enable(int cpu, struct coresight_event *event) 128 { 129 struct coresight_device *cs_dev; 130 struct endpoint *endp; 131 132 LIST_FOREACH(endp, &event->endplist, endplink) { 133 cs_dev = endp->cs_dev; 134 CORESIGHT_ENABLE(cs_dev->dev, endp, event); 135 } 136 } 137 138 void 139 coresight_disable(int cpu, struct coresight_event *event) 140 { 141 struct coresight_device *cs_dev; 142 struct endpoint *endp; 143 144 LIST_FOREACH(endp, &event->endplist, endplink) { 145 cs_dev = endp->cs_dev; 146 CORESIGHT_DISABLE(cs_dev->dev, endp, event); 147 } 148 } 149 150 void 151 coresight_read(int cpu, struct coresight_event *event) 152 { 153 struct endpoint *endp; 154 155 LIST_FOREACH(endp, &event->endplist, endplink) 156 CORESIGHT_READ(endp->cs_dev->dev, endp, event); 157 } 158