1 /*- 2 * Copyright (c) 2000 Michael Smith 3 * Copyright (c) 2000 BSDi 4 * Copyright (c) 2007-2012 Jung-uk Kim <jkim@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * 6.3 : Scheduling services 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include "opt_acpi.h" 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/bus.h> 40 #include <sys/interrupt.h> 41 #include <sys/kernel.h> 42 #include <sys/kthread.h> 43 #include <sys/malloc.h> 44 #include <sys/proc.h> 45 #include <sys/taskqueue.h> 46 47 #include <contrib/dev/acpica/include/acpi.h> 48 #include <contrib/dev/acpica/include/accommon.h> 49 50 #include <dev/acpica/acpivar.h> 51 52 #define _COMPONENT ACPI_OS_SERVICES 53 ACPI_MODULE_NAME("SCHEDULE") 54 55 /* 56 * Allow the user to tune the maximum number of tasks we may enqueue. 57 */ 58 static int acpi_max_tasks = ACPI_MAX_TASKS; 59 SYSCTL_INT(_debug_acpi, OID_AUTO, max_tasks, CTLFLAG_RDTUN, &acpi_max_tasks, 60 0, "Maximum acpi tasks"); 61 62 /* 63 * Allow the user to tune the number of task threads we start. It seems 64 * some systems have problems with increased parallelism. 65 */ 66 static int acpi_max_threads = ACPI_MAX_THREADS; 67 SYSCTL_INT(_debug_acpi, OID_AUTO, max_threads, CTLFLAG_RDTUN, &acpi_max_threads, 68 0, "Maximum acpi threads"); 69 70 static MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task"); 71 72 struct acpi_task_ctx { 73 struct task at_task; 74 ACPI_OSD_EXEC_CALLBACK at_function; 75 void *at_context; 76 int at_flag; 77 #define ACPI_TASK_FREE 0 78 #define ACPI_TASK_USED 1 79 #define ACPI_TASK_ENQUEUED 2 80 }; 81 82 struct taskqueue *acpi_taskq; 83 static struct acpi_task_ctx *acpi_tasks; 84 static int acpi_task_count; 85 static int acpi_taskq_started; 86 87 /* 88 * Preallocate some memory for tasks early enough. 89 * malloc(9) cannot be used with spin lock held. 90 */ 91 static void 92 acpi_task_init(void *arg) 93 { 94 95 acpi_tasks = malloc(sizeof(*acpi_tasks) * acpi_max_tasks, M_ACPITASK, 96 M_WAITOK | M_ZERO); 97 } 98 99 SYSINIT(acpi_tasks, SI_SUB_DRIVERS, SI_ORDER_FIRST, acpi_task_init, NULL); 100 101 /* 102 * Initialize ACPI task queue. 103 */ 104 static void 105 acpi_taskq_init(void *arg) 106 { 107 int i; 108 109 acpi_taskq = taskqueue_create_fast("acpi_task", M_NOWAIT, 110 &taskqueue_thread_enqueue, &acpi_taskq); 111 taskqueue_start_threads(&acpi_taskq, acpi_max_threads, PWAIT, "acpi_task"); 112 if (acpi_task_count > 0) { 113 if (bootverbose) 114 printf("AcpiOsExecute: enqueue %d pending tasks\n", 115 acpi_task_count); 116 for (i = 0; i < acpi_max_tasks; i++) 117 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_USED, 118 ACPI_TASK_USED | ACPI_TASK_ENQUEUED)) 119 taskqueue_enqueue(acpi_taskq, &acpi_tasks[i].at_task); 120 } 121 acpi_taskq_started = 1; 122 } 123 124 SYSINIT(acpi_taskq, SI_SUB_CONFIGURE, SI_ORDER_SECOND, acpi_taskq_init, NULL); 125 126 /* 127 * Bounce through this wrapper function since ACPI-CA doesn't understand 128 * the pending argument for its callbacks. 129 */ 130 static void 131 acpi_task_execute(void *context, int pending) 132 { 133 struct acpi_task_ctx *at; 134 135 at = (struct acpi_task_ctx *)context; 136 at->at_function(at->at_context); 137 atomic_clear_int(&at->at_flag, ACPI_TASK_USED | ACPI_TASK_ENQUEUED); 138 acpi_task_count--; 139 } 140 141 static ACPI_STATUS 142 acpi_task_enqueue(int priority, ACPI_OSD_EXEC_CALLBACK Function, void *Context) 143 { 144 struct acpi_task_ctx *at; 145 int i; 146 147 for (at = NULL, i = 0; i < acpi_max_tasks; i++) 148 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_FREE, 149 ACPI_TASK_USED)) { 150 at = &acpi_tasks[i]; 151 acpi_task_count++; 152 break; 153 } 154 if (at == NULL) { 155 printf("AcpiOsExecute: failed to enqueue task, consider increasing " 156 "the debug.acpi.max_tasks tunable\n"); 157 return (AE_NO_MEMORY); 158 } 159 160 TASK_INIT(&at->at_task, priority, acpi_task_execute, at); 161 at->at_function = Function; 162 at->at_context = Context; 163 164 /* 165 * If the task queue is ready, enqueue it now. 166 */ 167 if (acpi_taskq_started) { 168 atomic_set_int(&at->at_flag, ACPI_TASK_ENQUEUED); 169 taskqueue_enqueue(acpi_taskq, &at->at_task); 170 return (AE_OK); 171 } 172 if (bootverbose) 173 printf("AcpiOsExecute: task queue not started\n"); 174 175 return (AE_OK); 176 } 177 178 /* 179 * This function may be called in interrupt context, i.e. when a GPE fires. 180 * We allocate and queue a task for one of our taskqueue threads to process. 181 */ 182 ACPI_STATUS 183 AcpiOsExecute(ACPI_EXECUTE_TYPE Type, ACPI_OSD_EXEC_CALLBACK Function, 184 void *Context) 185 { 186 ACPI_STATUS status; 187 int pri; 188 189 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 190 191 if (Function == NULL) 192 return_ACPI_STATUS(AE_BAD_PARAMETER); 193 194 switch (Type) { 195 case OSL_GPE_HANDLER: 196 case OSL_NOTIFY_HANDLER: 197 /* 198 * Run GPEs and Notifies at the same priority. This allows 199 * Notifies that are generated by running a GPE's method (e.g., _L00) 200 * to not be pre-empted by a later GPE that arrives during the 201 * Notify handler execution. 202 */ 203 pri = 10; 204 break; 205 case OSL_GLOBAL_LOCK_HANDLER: 206 case OSL_EC_POLL_HANDLER: 207 case OSL_EC_BURST_HANDLER: 208 pri = 5; 209 break; 210 case OSL_DEBUGGER_THREAD: 211 pri = 0; 212 break; 213 default: 214 return_ACPI_STATUS(AE_BAD_PARAMETER); 215 } 216 217 status = acpi_task_enqueue(pri, Function, Context); 218 return_ACPI_STATUS(status); 219 } 220 221 void 222 AcpiOsWaitEventsComplete(void) 223 { 224 int i; 225 226 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 227 228 for (i = 0; i < acpi_max_tasks; i++) 229 if ((atomic_load_acq_int(&acpi_tasks[i].at_flag) & 230 ACPI_TASK_ENQUEUED) != 0) 231 taskqueue_drain(acpi_taskq, &acpi_tasks[i].at_task); 232 return_VOID; 233 } 234 235 void 236 AcpiOsSleep(UINT64 Milliseconds) 237 { 238 int timo; 239 240 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 241 242 timo = Milliseconds * hz / 1000; 243 244 /* 245 * If requested sleep time is less than our hz resolution, use 246 * DELAY instead for better granularity. 247 */ 248 if (timo > 0) 249 pause("acpislp", timo); 250 else 251 DELAY(Milliseconds * 1000); 252 253 return_VOID; 254 } 255 256 /* 257 * Return the current time in 100 nanosecond units 258 */ 259 UINT64 260 AcpiOsGetTimer(void) 261 { 262 struct bintime bt; 263 UINT64 t; 264 265 /* XXX During early boot there is no (decent) timer available yet. */ 266 KASSERT(cold == 0, ("acpi: timer op not yet supported during boot")); 267 268 binuptime(&bt); 269 t = (uint64_t)bt.sec * 10000000; 270 t += ((uint64_t)10000000 * (uint32_t)(bt.frac >> 32)) >> 32; 271 272 return (t); 273 } 274 275 void 276 AcpiOsStall(UINT32 Microseconds) 277 { 278 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 279 280 DELAY(Microseconds); 281 return_VOID; 282 } 283 284 ACPI_THREAD_ID 285 AcpiOsGetThreadId(void) 286 { 287 288 /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */ 289 290 /* Returning 0 is not allowed. */ 291 return (curthread->td_tid); 292 } 293