1 /*- 2 * Copyright (c) 2000 Michael Smith 3 * Copyright (c) 2000 BSDi 4 * Copyright (c) 2007-2009 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 TUNABLE_INT("debug.acpi.max_tasks", &acpi_max_tasks); 60 61 /* 62 * Allow the user to tune the number of task threads we start. It seems 63 * some systems have problems with increased parallelism. 64 */ 65 static int acpi_max_threads = ACPI_MAX_THREADS; 66 TUNABLE_INT("debug.acpi.max_threads", &acpi_max_threads); 67 68 static MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task"); 69 70 struct acpi_task_ctx { 71 struct task at_task; 72 ACPI_OSD_EXEC_CALLBACK at_function; 73 void *at_context; 74 int at_flag; 75 #define ACPI_TASK_FREE 0 76 #define ACPI_TASK_USED 1 77 #define ACPI_TASK_ENQUEUED 2 78 }; 79 80 struct taskqueue *acpi_taskq; 81 static struct acpi_task_ctx *acpi_tasks; 82 static int acpi_task_count; 83 static int acpi_taskq_started; 84 85 /* 86 * Preallocate some memory for tasks early enough. 87 * malloc(9) cannot be used with spin lock held. 88 */ 89 static void 90 acpi_task_init(void *arg) 91 { 92 93 acpi_tasks = malloc(sizeof(*acpi_tasks) * acpi_max_tasks, M_ACPITASK, 94 M_WAITOK | M_ZERO); 95 } 96 97 SYSINIT(acpi_tasks, SI_SUB_DRIVERS, SI_ORDER_FIRST, acpi_task_init, NULL); 98 99 /* 100 * Initialize ACPI task queue. 101 */ 102 static void 103 acpi_taskq_init(void *arg) 104 { 105 int i; 106 107 acpi_taskq = taskqueue_create_fast("acpi_task", M_NOWAIT, 108 &taskqueue_thread_enqueue, &acpi_taskq); 109 taskqueue_start_threads(&acpi_taskq, acpi_max_threads, PWAIT, "acpi_task"); 110 if (acpi_task_count > 0) { 111 if (bootverbose) 112 printf("AcpiOsExecute: enqueue %d pending tasks\n", 113 acpi_task_count); 114 for (i = 0; i < acpi_max_tasks; i++) 115 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_USED, 116 ACPI_TASK_USED | ACPI_TASK_ENQUEUED)) 117 taskqueue_enqueue(acpi_taskq, &acpi_tasks[i].at_task); 118 } 119 acpi_taskq_started = 1; 120 } 121 122 SYSINIT(acpi_taskq, SI_SUB_CONFIGURE, SI_ORDER_SECOND, acpi_taskq_init, NULL); 123 124 /* 125 * Bounce through this wrapper function since ACPI-CA doesn't understand 126 * the pending argument for its callbacks. 127 */ 128 static void 129 acpi_task_execute(void *context, int pending) 130 { 131 struct acpi_task_ctx *at; 132 133 at = (struct acpi_task_ctx *)context; 134 at->at_function(at->at_context); 135 atomic_clear_int(&at->at_flag, ACPI_TASK_USED | ACPI_TASK_ENQUEUED); 136 acpi_task_count--; 137 } 138 139 static ACPI_STATUS 140 acpi_task_enqueue(int priority, ACPI_OSD_EXEC_CALLBACK Function, void *Context) 141 { 142 struct acpi_task_ctx *at; 143 int i; 144 145 for (at = NULL, i = 0; i < acpi_max_tasks; i++) 146 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_FREE, 147 ACPI_TASK_USED)) { 148 at = &acpi_tasks[i]; 149 acpi_task_count++; 150 break; 151 } 152 if (at == NULL) { 153 printf("AcpiOsExecute: failed to enqueue task, consider increasing " 154 "the debug.acpi.max_tasks tunable\n"); 155 return (AE_NO_MEMORY); 156 } 157 158 TASK_INIT(&at->at_task, priority, acpi_task_execute, at); 159 at->at_function = Function; 160 at->at_context = Context; 161 162 /* 163 * If the task queue is ready, enqueue it now. 164 */ 165 if (acpi_taskq_started) { 166 atomic_set_int(&at->at_flag, ACPI_TASK_ENQUEUED); 167 taskqueue_enqueue(acpi_taskq, &at->at_task); 168 return (AE_OK); 169 } 170 if (bootverbose) 171 printf("AcpiOsExecute: task queue not started\n"); 172 173 return (AE_OK); 174 } 175 176 /* 177 * This function may be called in interrupt context, i.e. when a GPE fires. 178 * We allocate and queue a task for one of our taskqueue threads to process. 179 */ 180 ACPI_STATUS 181 AcpiOsExecute(ACPI_EXECUTE_TYPE Type, ACPI_OSD_EXEC_CALLBACK Function, 182 void *Context) 183 { 184 int pri; 185 186 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 187 188 if (Function == NULL) 189 return_ACPI_STATUS (AE_BAD_PARAMETER); 190 191 switch (Type) { 192 case OSL_GPE_HANDLER: 193 case OSL_NOTIFY_HANDLER: 194 /* 195 * Run GPEs and Notifies at the same priority. This allows 196 * Notifies that are generated by running a GPE's method (e.g., _L00) 197 * to not be pre-empted by a later GPE that arrives during the 198 * Notify handler execution. 199 */ 200 pri = 10; 201 break; 202 case OSL_GLOBAL_LOCK_HANDLER: 203 case OSL_EC_POLL_HANDLER: 204 case OSL_EC_BURST_HANDLER: 205 pri = 5; 206 break; 207 case OSL_DEBUGGER_THREAD: 208 pri = 0; 209 break; 210 default: 211 return_ACPI_STATUS (AE_BAD_PARAMETER); 212 } 213 214 return_ACPI_STATUS (acpi_task_enqueue(pri, Function, Context)); 215 } 216 217 void 218 AcpiOsSleep(UINT64 Milliseconds) 219 { 220 int timo; 221 222 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 223 224 timo = Milliseconds * hz / 1000; 225 226 /* 227 * If requested sleep time is less than our hz resolution, use 228 * DELAY instead for better granularity. 229 */ 230 if (timo > 0) 231 pause("acpislp", timo); 232 else 233 DELAY(Milliseconds * 1000); 234 235 return_VOID; 236 } 237 238 /* 239 * Return the current time in 100 nanosecond units 240 */ 241 UINT64 242 AcpiOsGetTimer(void) 243 { 244 struct bintime bt; 245 UINT64 t; 246 247 /* XXX During early boot there is no (decent) timer available yet. */ 248 KASSERT(cold == 0, ("acpi: timer op not yet supported during boot")); 249 250 binuptime(&bt); 251 t = ((UINT64)10000000 * (uint32_t)(bt.frac >> 32)) >> 32; 252 t += bt.sec * 10000000; 253 254 return (t); 255 } 256 257 void 258 AcpiOsStall(UINT32 Microseconds) 259 { 260 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 261 262 DELAY(Microseconds); 263 return_VOID; 264 } 265 266 ACPI_THREAD_ID 267 AcpiOsGetThreadId(void) 268 { 269 270 /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */ 271 272 /* Returning 0 is not allowed. */ 273 return (curthread->td_tid); 274 } 275