| 1 | /* $NetBSD: sys_pmc.c,v 1.11 2014/01/25 21:11:49 christos Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2002 Wasabi Systems, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Written by Allen Briggs for Wasabi Systems, Inc. |
| 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 | * 3. All advertising materials mentioning features or use of this software |
| 18 | * must display the following acknowledgement: |
| 19 | * This product includes software developed for the NetBSD Project by |
| 20 | * Wasabi Systems, Inc. |
| 21 | * 4. The name of Wasabi Systems, Inc. may not be used to endorse |
| 22 | * or promote products derived from this software without specific prior |
| 23 | * written permission. |
| 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND |
| 26 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 27 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 28 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC |
| 29 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 32 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 33 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 34 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 35 | * POSSIBILITY OF SUCH DAMAGE. |
| 36 | */ |
| 37 | |
| 38 | #include <sys/cdefs.h> |
| 39 | __KERNEL_RCSID(0, "$NetBSD: sys_pmc.c,v 1.11 2014/01/25 21:11:49 christos Exp $" ); |
| 40 | |
| 41 | #include "opt_perfctrs.h" |
| 42 | |
| 43 | #include <sys/param.h> |
| 44 | #include <sys/proc.h> |
| 45 | #include <sys/mount.h> |
| 46 | #include <sys/systm.h> |
| 47 | #include <sys/syscallargs.h> |
| 48 | #include <sys/types.h> |
| 49 | |
| 50 | #if defined(PERFCTRS) |
| 51 | #include <sys/pmc.h> |
| 52 | #endif |
| 53 | |
| 54 | /* |
| 55 | * XXX We need a multiprocessor locking protocol! |
| 56 | */ |
| 57 | |
| 58 | int |
| 59 | sys_pmc_control(struct lwp *l, const struct sys_pmc_control_args *uap, register_t *retval) |
| 60 | { |
| 61 | /* { |
| 62 | syscallarg(int) ctr; |
| 63 | syscallarg(int) op; |
| 64 | syscallarg(void *) args; |
| 65 | } */ |
| 66 | #ifndef PERFCTRS |
| 67 | return ENXIO; |
| 68 | #else |
| 69 | struct pmc_counter_cfg cfg; |
| 70 | void *args; |
| 71 | int ctr, operation, error=0; |
| 72 | |
| 73 | ctr = SCARG(uap, ctr); |
| 74 | __USE(ctr); |
| 75 | operation = SCARG(uap, op); |
| 76 | |
| 77 | KERNEL_LOCK(1, NULL); |
| 78 | switch (operation) { |
| 79 | case PMC_OP_START: |
| 80 | if (!pmc_counter_isconfigured(l->l_proc, ctr)) { |
| 81 | error = ENXIO; |
| 82 | } else if (pmc_counter_isrunning(l->l_proc, ctr)) { |
| 83 | error = EINPROGRESS; |
| 84 | } else { |
| 85 | pmc_enable_counter(l->l_proc, ctr); |
| 86 | } |
| 87 | break; |
| 88 | case PMC_OP_STOP: |
| 89 | if (!pmc_counter_isconfigured(l->l_proc, ctr)) { |
| 90 | error = ENXIO; |
| 91 | } else if (pmc_counter_isrunning(l->l_proc, ctr)) { |
| 92 | pmc_disable_counter(l->l_proc, ctr); |
| 93 | } |
| 94 | break; |
| 95 | case PMC_OP_CONFIGURE: |
| 96 | args = SCARG(uap, args); |
| 97 | |
| 98 | if (pmc_counter_isrunning(l->l_proc, ctr)) { |
| 99 | pmc_disable_counter(l->l_proc, ctr); |
| 100 | } |
| 101 | error = copyin(args, &cfg, sizeof(struct pmc_counter_cfg)); |
| 102 | if (error == 0) { |
| 103 | error = pmc_configure_counter(l->l_proc, ctr, &cfg); |
| 104 | } |
| 105 | break; |
| 106 | case PMC_OP_PROFSTART: |
| 107 | args = SCARG(uap, args); |
| 108 | |
| 109 | error = copyin(args, &cfg, sizeof(struct pmc_counter_cfg)); |
| 110 | if (error == 0) { |
| 111 | error = pmc_start_profiling(ctr, &cfg); |
| 112 | } |
| 113 | break; |
| 114 | case PMC_OP_PROFSTOP: |
| 115 | error = pmc_stop_profiling(ctr); |
| 116 | break; |
| 117 | default: |
| 118 | error = EINVAL; |
| 119 | break; |
| 120 | } |
| 121 | KERNEL_UNLOCK_ONE(NULL); |
| 122 | return error; |
| 123 | #endif |
| 124 | } |
| 125 | |
| 126 | int |
| 127 | sys_pmc_get_info(struct lwp *l, const struct sys_pmc_get_info_args *uap, register_t *retval) |
| 128 | { |
| 129 | /* { |
| 130 | syscallarg(int) ctr; |
| 131 | syscallarg(int) op; |
| 132 | syscallarg(void *) args; |
| 133 | } */ |
| 134 | #ifndef PERFCTRS |
| 135 | return ENXIO; |
| 136 | #else |
| 137 | uint64_t val; |
| 138 | void *args; |
| 139 | int nctrs, ctr, ctrt, request, error=0, flags=0; |
| 140 | |
| 141 | ctr = SCARG(uap, ctr); |
| 142 | request = SCARG(uap, op); |
| 143 | args = SCARG(uap, args); |
| 144 | __USE(flags); |
| 145 | |
| 146 | KERNEL_LOCK(1, NULL); |
| 147 | nctrs = pmc_get_num_counters(); |
| 148 | switch (request) { |
| 149 | case PMC_INFO_NCOUNTERS: /* args should be (int *) */ |
| 150 | error = copyout(&nctrs, args, sizeof(int)); |
| 151 | break; |
| 152 | |
| 153 | case PMC_INFO_CPUCTR_TYPE: /* args should be (int *) */ |
| 154 | ctrt = pmc_get_counter_type(ctr); |
| 155 | error = copyout(&ctrt, args, sizeof(int)); |
| 156 | break; |
| 157 | /* args should be (pmc_ctr_t *) */ |
| 158 | case PMC_INFO_ACCUMULATED_COUNTER_VALUE: |
| 159 | flags = PMC_VALUE_FLAGS_CHILDREN; |
| 160 | /*FALLTHROUGH*/ |
| 161 | case PMC_INFO_COUNTER_VALUE: |
| 162 | if (ctr < 0 || ctr >= nctrs) { |
| 163 | error = EINVAL; |
| 164 | break; |
| 165 | } |
| 166 | error = pmc_get_counter_value(l->l_proc, ctr, flags, &val); |
| 167 | if (error == 0) { |
| 168 | error = copyout(&val, args, sizeof(uint64_t)); |
| 169 | } |
| 170 | break; |
| 171 | default: |
| 172 | error = EINVAL; |
| 173 | break; |
| 174 | } |
| 175 | KERNEL_UNLOCK_ONE(NULL); |
| 176 | return error; |
| 177 | #endif |
| 178 | } |
| 179 | |