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/kernel.h> 41 #include <sys/kthread.h> 42 #include <sys/malloc.h> 43 #include <sys/proc.h> 44 #include <sys/taskqueue.h> 45 46 #include <contrib/dev/acpica/include/acpi.h> 47 #include <contrib/dev/acpica/include/accommon.h> 48 49 #include <dev/acpica/acpivar.h> 50 51 #define _COMPONENT ACPI_OS_SERVICES 52 ACPI_MODULE_NAME("SCHEDULE") 53 54 /* 55 * Allow the user to tune the maximum number of tasks we may enqueue. 56 */ 57 static int acpi_max_tasks = ACPI_MAX_TASKS; 58 SYSCTL_INT(_debug_acpi, OID_AUTO, max_tasks, CTLFLAG_RDTUN, &acpi_max_tasks, 59 0, "Maximum acpi tasks"); 60 61 /* 62 * Track and report the system's demand for task slots. 63 */ 64 static int acpi_tasks_hiwater; 65 SYSCTL_INT(_debug_acpi, OID_AUTO, tasks_hiwater, CTLFLAG_RD, 66 &acpi_tasks_hiwater, 1, "Peak demand for ACPI event task slots."); 67 68 /* 69 * Allow the user to tune the number of task threads we start. It seems 70 * some systems have problems with increased parallelism. 71 */ 72 static int acpi_max_threads = ACPI_MAX_THREADS; 73 SYSCTL_INT(_debug_acpi, OID_AUTO, max_threads, CTLFLAG_RDTUN, &acpi_max_threads, 74 0, "Maximum acpi threads"); 75 76 static MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task"); 77 78 struct acpi_task_ctx { 79 struct task at_task; 80 ACPI_OSD_EXEC_CALLBACK at_function; 81 void *at_context; 82 int at_flag; 83 #define ACPI_TASK_FREE 0 84 #define ACPI_TASK_USED 1 85 #define ACPI_TASK_ENQUEUED 2 86 }; 87 88 struct taskqueue *acpi_taskq; 89 static struct acpi_task_ctx *acpi_tasks; 90 static int acpi_task_count; 91 static int acpi_taskq_started; 92 93 /* 94 * Preallocate some memory for tasks early enough. 95 * malloc(9) cannot be used with spin lock held. 96 */ 97 static void 98 acpi_task_init(void *arg) 99 { 100 101 acpi_tasks = malloc(sizeof(*acpi_tasks) * acpi_max_tasks, M_ACPITASK, 102 M_WAITOK | M_ZERO); 103 } 104 105 SYSINIT(acpi_tasks, SI_SUB_DRIVERS, SI_ORDER_FIRST, acpi_task_init, NULL); 106 107 /* 108 * Initialize ACPI task queue. 109 */ 110 static void 111 acpi_taskq_init(void *arg) 112 { 113 int i; 114 115 acpi_taskq = taskqueue_create_fast("acpi_task", M_NOWAIT, 116 &taskqueue_thread_enqueue, &acpi_taskq); 117 taskqueue_start_threads(&acpi_taskq, acpi_max_threads, PWAIT, "acpi_task"); 118 if (acpi_task_count > 0) { 119 if (bootverbose) 120 printf("AcpiOsExecute: enqueue %d pending tasks\n", 121 acpi_task_count); 122 for (i = 0; i < acpi_max_tasks; i++) 123 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_USED, 124 ACPI_TASK_USED | ACPI_TASK_ENQUEUED)) 125 taskqueue_enqueue(acpi_taskq, &acpi_tasks[i].at_task); 126 } 127 acpi_taskq_started = 1; 128 } 129 130 SYSINIT(acpi_taskq, SI_SUB_KICK_SCHEDULER, SI_ORDER_ANY, acpi_taskq_init, NULL); 131 132 /* 133 * Bounce through this wrapper function since ACPI-CA doesn't understand 134 * the pending argument for its callbacks. 135 */ 136 static void 137 acpi_task_execute(void *context, int pending) 138 { 139 struct acpi_task_ctx *at; 140 141 at = (struct acpi_task_ctx *)context; 142 at->at_function(at->at_context); 143 atomic_clear_int(&at->at_flag, ACPI_TASK_USED | ACPI_TASK_ENQUEUED); 144 acpi_task_count--; 145 } 146 147 static ACPI_STATUS 148 acpi_task_enqueue(int priority, ACPI_OSD_EXEC_CALLBACK Function, void *Context) 149 { 150 struct acpi_task_ctx *at; 151 int i; 152 153 for (at = NULL, i = 0; i < acpi_max_tasks; i++) 154 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_FREE, 155 ACPI_TASK_USED)) { 156 at = &acpi_tasks[i]; 157 acpi_task_count++; 158 break; 159 } 160 161 if (i > acpi_tasks_hiwater) 162 atomic_cmpset_int(&acpi_tasks_hiwater, acpi_tasks_hiwater, i); 163 164 if (at == NULL) { 165 printf("AcpiOsExecute: failed to enqueue task, consider increasing " 166 "the debug.acpi.max_tasks tunable\n"); 167 return (AE_NO_MEMORY); 168 } 169 170 TASK_INIT(&at->at_task, priority, acpi_task_execute, at); 171 at->at_function = Function; 172 at->at_context = Context; 173 174 /* 175 * If the task queue is ready, enqueue it now. 176 */ 177 if (acpi_taskq_started) { 178 atomic_set_int(&at->at_flag, ACPI_TASK_ENQUEUED); 179 taskqueue_enqueue(acpi_taskq, &at->at_task); 180 return (AE_OK); 181 } 182 if (bootverbose) 183 printf("AcpiOsExecute: task queue not started\n"); 184 185 return (AE_OK); 186 } 187 188 /* 189 * This function may be called in interrupt context, i.e. when a GPE fires. 190 * We allocate and queue a task for one of our taskqueue threads to process. 191 */ 192 ACPI_STATUS 193 AcpiOsExecute(ACPI_EXECUTE_TYPE Type, ACPI_OSD_EXEC_CALLBACK Function, 194 void *Context) 195 { 196 ACPI_STATUS status; 197 int pri; 198 199 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 200 201 if (Function == NULL) 202 return_ACPI_STATUS(AE_BAD_PARAMETER); 203 204 switch (Type) { 205 case OSL_GPE_HANDLER: 206 case OSL_NOTIFY_HANDLER: 207 /* 208 * Run GPEs and Notifies at the same priority. This allows 209 * Notifies that are generated by running a GPE's method (e.g., _L00) 210 * to not be pre-empted by a later GPE that arrives during the 211 * Notify handler execution. 212 */ 213 pri = 10; 214 break; 215 case OSL_GLOBAL_LOCK_HANDLER: 216 case OSL_EC_POLL_HANDLER: 217 case OSL_EC_BURST_HANDLER: 218 pri = 5; 219 break; 220 case OSL_DEBUGGER_MAIN_THREAD: 221 case OSL_DEBUGGER_EXEC_THREAD: 222 pri = 0; 223 break; 224 default: 225 return_ACPI_STATUS(AE_BAD_PARAMETER); 226 } 227 228 status = acpi_task_enqueue(pri, Function, Context); 229 return_ACPI_STATUS(status); 230 } 231 232 void 233 AcpiOsWaitEventsComplete(void) 234 { 235 int i; 236 237 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 238 239 for (i = 0; i < acpi_max_tasks; i++) 240 if ((atomic_load_acq_int(&acpi_tasks[i].at_flag) & 241 ACPI_TASK_ENQUEUED) != 0) 242 taskqueue_drain(acpi_taskq, &acpi_tasks[i].at_task); 243 return_VOID; 244 } 245 246 void 247 AcpiOsSleep(UINT64 Milliseconds) 248 { 249 int timo; 250 251 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 252 253 timo = Milliseconds * hz / 1000; 254 255 /* 256 * If requested sleep time is less than our hz resolution, use 257 * DELAY instead for better granularity. 258 */ 259 if (timo > 0) 260 pause("acpislp", timo); 261 else 262 DELAY(Milliseconds * 1000); 263 264 return_VOID; 265 } 266 267 /* 268 * Return the current time in 100 nanosecond units 269 */ 270 UINT64 271 AcpiOsGetTimer(void) 272 { 273 struct bintime bt; 274 UINT64 t; 275 276 binuptime(&bt); 277 t = (uint64_t)bt.sec * 10000000; 278 t += ((uint64_t)10000000 * (uint32_t)(bt.frac >> 32)) >> 32; 279 280 return (t); 281 } 282 283 void 284 AcpiOsStall(UINT32 Microseconds) 285 { 286 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 287 288 DELAY(Microseconds); 289 return_VOID; 290 } 291 292 ACPI_THREAD_ID 293 AcpiOsGetThreadId(void) 294 { 295 296 /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */ 297 298 /* Returning 0 is not allowed. */ 299 return (curthread->td_tid); 300 } 301