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/param.h> 34 #include <sys/systm.h> 35 #include <sys/bus.h> 36 #include <sys/kernel.h> 37 #include <sys/kthread.h> 38 #include <sys/malloc.h> 39 #include <sys/proc.h> 40 #include <sys/taskqueue.h> 41 42 #include <contrib/dev/acpica/include/acpi.h> 43 #include <contrib/dev/acpica/include/accommon.h> 44 45 #include <dev/acpica/acpivar.h> 46 47 #define _COMPONENT ACPI_OS_SERVICES 48 ACPI_MODULE_NAME("SCHEDULE") 49 50 /* 51 * Allow the user to tune the maximum number of tasks we may enqueue. 52 */ 53 static int acpi_max_tasks = ACPI_MAX_TASKS; 54 SYSCTL_INT(_debug_acpi, OID_AUTO, max_tasks, CTLFLAG_RDTUN, &acpi_max_tasks, 55 0, "Maximum acpi tasks"); 56 57 /* 58 * Track and report the system's demand for task slots. 59 */ 60 static int acpi_tasks_hiwater; 61 SYSCTL_INT(_debug_acpi, OID_AUTO, tasks_hiwater, CTLFLAG_RD, 62 &acpi_tasks_hiwater, 1, "Peak demand for ACPI event task slots."); 63 64 /* 65 * Allow the user to tune the number of task threads we start. It seems 66 * some systems have problems with increased parallelism. 67 */ 68 static int acpi_max_threads = ACPI_MAX_THREADS; 69 SYSCTL_INT(_debug_acpi, OID_AUTO, max_threads, CTLFLAG_RDTUN, &acpi_max_threads, 70 0, "Maximum acpi threads"); 71 72 static MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task"); 73 74 struct acpi_task_ctx { 75 struct task at_task; 76 ACPI_OSD_EXEC_CALLBACK at_function; 77 void *at_context; 78 int at_flag; 79 #define ACPI_TASK_FREE 0 80 #define ACPI_TASK_USED 1 81 #define ACPI_TASK_ENQUEUED 2 82 }; 83 84 struct taskqueue *acpi_taskq; 85 static struct acpi_task_ctx *acpi_tasks; 86 /* Unsynchronized as only useful in the mono-CPU startup phase. */ 87 static int acpi_task_count; 88 static int acpi_taskq_started; 89 90 /* 91 * Preallocate some memory for tasks early enough. 92 * malloc(9) cannot be used with spin lock held. 93 */ 94 static void 95 acpi_task_init(void *arg) 96 { 97 98 acpi_tasks = malloc(sizeof(*acpi_tasks) * acpi_max_tasks, M_ACPITASK, 99 M_WAITOK | M_ZERO); 100 } 101 102 SYSINIT(acpi_tasks, SI_SUB_DRIVERS, SI_ORDER_FIRST, acpi_task_init, NULL); 103 104 /* 105 * Initialize ACPI task queue. 106 */ 107 static void 108 acpi_taskq_init(void *arg) 109 { 110 int i; 111 112 acpi_taskq = taskqueue_create_fast("acpi_task", M_NOWAIT, 113 &taskqueue_thread_enqueue, &acpi_taskq); 114 taskqueue_start_threads(&acpi_taskq, acpi_max_threads, PWAIT, "acpi_task"); 115 if (acpi_task_count > 0) { 116 if (bootverbose) 117 printf("AcpiOsExecute: enqueue %d pending tasks\n", 118 acpi_task_count); 119 for (i = 0; i < acpi_max_tasks; i++) 120 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_USED, 121 ACPI_TASK_USED | ACPI_TASK_ENQUEUED)) 122 taskqueue_enqueue(acpi_taskq, &acpi_tasks[i].at_task); 123 } 124 acpi_taskq_started = 1; 125 } 126 127 SYSINIT(acpi_taskq, SI_SUB_KICK_SCHEDULER, SI_ORDER_ANY, acpi_taskq_init, NULL); 128 129 /* 130 * Bounce through this wrapper function since ACPI-CA doesn't understand 131 * the pending argument for its callbacks. 132 */ 133 static void 134 acpi_task_execute(void *context, int pending) 135 { 136 struct acpi_task_ctx *at; 137 138 at = (struct acpi_task_ctx *)context; 139 at->at_function(at->at_context); 140 atomic_clear_int(&at->at_flag, ACPI_TASK_USED | ACPI_TASK_ENQUEUED); 141 acpi_task_count--; 142 } 143 144 static ACPI_STATUS 145 acpi_task_enqueue(int priority, ACPI_OSD_EXEC_CALLBACK Function, void *Context) 146 { 147 struct acpi_task_ctx *at; 148 int i; 149 150 for (at = NULL, i = 0; i < acpi_max_tasks; i++) 151 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_FREE, 152 ACPI_TASK_USED)) { 153 at = &acpi_tasks[i]; 154 acpi_task_count++; 155 break; 156 } 157 158 if (i > acpi_tasks_hiwater) 159 atomic_cmpset_int(&acpi_tasks_hiwater, acpi_tasks_hiwater, i); 160 161 if (at == NULL) { 162 printf("AcpiOsExecute: failed to enqueue task, consider increasing " 163 "the debug.acpi.max_tasks tunable\n"); 164 return (AE_NO_MEMORY); 165 } 166 167 TASK_INIT(&at->at_task, priority, acpi_task_execute, at); 168 at->at_function = Function; 169 at->at_context = Context; 170 171 /* 172 * If the task queue is ready, enqueue it now. 173 */ 174 if (acpi_taskq_started) { 175 atomic_set_int(&at->at_flag, ACPI_TASK_ENQUEUED); 176 taskqueue_enqueue(acpi_taskq, &at->at_task); 177 return (AE_OK); 178 } 179 if (bootverbose) 180 printf("AcpiOsExecute: task queue not started\n"); 181 182 return (AE_OK); 183 } 184 185 /* 186 * This function may be called in interrupt context, i.e. when a GPE fires. 187 * We allocate and queue a task for one of our taskqueue threads to process. 188 */ 189 ACPI_STATUS 190 AcpiOsExecute(ACPI_EXECUTE_TYPE Type, ACPI_OSD_EXEC_CALLBACK Function, 191 void *Context) 192 { 193 ACPI_STATUS status; 194 int pri; 195 196 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 197 198 if (Function == NULL) 199 return_ACPI_STATUS(AE_BAD_PARAMETER); 200 201 switch (Type) { 202 case OSL_GPE_HANDLER: 203 case OSL_NOTIFY_HANDLER: 204 /* 205 * Run GPEs and Notifies at the same priority. This allows 206 * Notifies that are generated by running a GPE's method (e.g., _L00) 207 * to not be pre-empted by a later GPE that arrives during the 208 * Notify handler execution. 209 */ 210 pri = 10; 211 break; 212 case OSL_GLOBAL_LOCK_HANDLER: 213 case OSL_EC_POLL_HANDLER: 214 case OSL_EC_BURST_HANDLER: 215 pri = 5; 216 break; 217 case OSL_DEBUGGER_MAIN_THREAD: 218 case OSL_DEBUGGER_EXEC_THREAD: 219 pri = 0; 220 break; 221 default: 222 return_ACPI_STATUS(AE_BAD_PARAMETER); 223 } 224 225 status = acpi_task_enqueue(pri, Function, Context); 226 return_ACPI_STATUS(status); 227 } 228 229 void 230 AcpiOsWaitEventsComplete(void) 231 { 232 int i; 233 234 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 235 236 for (i = 0; i < acpi_max_tasks; i++) 237 if ((atomic_load_acq_int(&acpi_tasks[i].at_flag) & 238 ACPI_TASK_ENQUEUED) != 0) 239 taskqueue_drain(acpi_taskq, &acpi_tasks[i].at_task); 240 return_VOID; 241 } 242 243 void 244 AcpiOsSleep(UINT64 Milliseconds) 245 { 246 int timo; 247 248 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 249 250 timo = Milliseconds * hz / 1000; 251 252 /* 253 * If requested sleep time is less than our hz resolution, use 254 * DELAY instead for better granularity. 255 */ 256 if (timo > 0) 257 pause("acpislp", timo); 258 else 259 DELAY(Milliseconds * 1000); 260 261 return_VOID; 262 } 263 264 /* 265 * Return the current time in 100 nanosecond units 266 */ 267 UINT64 268 AcpiOsGetTimer(void) 269 { 270 struct bintime bt; 271 UINT64 t; 272 273 binuptime(&bt); 274 t = (uint64_t)bt.sec * 10000000; 275 t += ((uint64_t)10000000 * (uint32_t)(bt.frac >> 32)) >> 32; 276 277 return (t); 278 } 279 280 void 281 AcpiOsStall(UINT32 Microseconds) 282 { 283 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 284 285 DELAY(Microseconds); 286 return_VOID; 287 } 288 289 ACPI_THREAD_ID 290 AcpiOsGetThreadId(void) 291 { 292 293 /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */ 294 295 /* Returning 0 is not allowed. */ 296 return (curthread->td_tid); 297 } 298