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 * Track and report the system's demand for task slots. 64 */ 65 static int acpi_tasks_hiwater; 66 SYSCTL_INT(_debug_acpi, OID_AUTO, tasks_hiwater, CTLFLAG_RD, 67 &acpi_tasks_hiwater, 1, "Peak demand for ACPI event task slots."); 68 69 /* 70 * Allow the user to tune the number of task threads we start. It seems 71 * some systems have problems with increased parallelism. 72 */ 73 static int acpi_max_threads = ACPI_MAX_THREADS; 74 SYSCTL_INT(_debug_acpi, OID_AUTO, max_threads, CTLFLAG_RDTUN, &acpi_max_threads, 75 0, "Maximum acpi threads"); 76 77 static MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task"); 78 79 struct acpi_task_ctx { 80 struct task at_task; 81 ACPI_OSD_EXEC_CALLBACK at_function; 82 void *at_context; 83 int at_flag; 84 #define ACPI_TASK_FREE 0 85 #define ACPI_TASK_USED 1 86 #define ACPI_TASK_ENQUEUED 2 87 }; 88 89 struct taskqueue *acpi_taskq; 90 static struct acpi_task_ctx *acpi_tasks; 91 static int acpi_task_count; 92 static int acpi_taskq_started; 93 94 /* 95 * Preallocate some memory for tasks early enough. 96 * malloc(9) cannot be used with spin lock held. 97 */ 98 static void 99 acpi_task_init(void *arg) 100 { 101 102 acpi_tasks = malloc(sizeof(*acpi_tasks) * acpi_max_tasks, M_ACPITASK, 103 M_WAITOK | M_ZERO); 104 } 105 106 SYSINIT(acpi_tasks, SI_SUB_DRIVERS, SI_ORDER_FIRST, acpi_task_init, NULL); 107 108 /* 109 * Initialize ACPI task queue. 110 */ 111 static void 112 acpi_taskq_init(void *arg) 113 { 114 int i; 115 116 acpi_taskq = taskqueue_create_fast("acpi_task", M_NOWAIT, 117 &taskqueue_thread_enqueue, &acpi_taskq); 118 taskqueue_start_threads(&acpi_taskq, acpi_max_threads, PWAIT, "acpi_task"); 119 if (acpi_task_count > 0) { 120 if (bootverbose) 121 printf("AcpiOsExecute: enqueue %d pending tasks\n", 122 acpi_task_count); 123 for (i = 0; i < acpi_max_tasks; i++) 124 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_USED, 125 ACPI_TASK_USED | ACPI_TASK_ENQUEUED)) 126 taskqueue_enqueue(acpi_taskq, &acpi_tasks[i].at_task); 127 } 128 acpi_taskq_started = 1; 129 } 130 131 SYSINIT(acpi_taskq, SI_SUB_CONFIGURE, SI_ORDER_SECOND, acpi_taskq_init, NULL); 132 133 /* 134 * Bounce through this wrapper function since ACPI-CA doesn't understand 135 * the pending argument for its callbacks. 136 */ 137 static void 138 acpi_task_execute(void *context, int pending) 139 { 140 struct acpi_task_ctx *at; 141 142 at = (struct acpi_task_ctx *)context; 143 at->at_function(at->at_context); 144 atomic_clear_int(&at->at_flag, ACPI_TASK_USED | ACPI_TASK_ENQUEUED); 145 acpi_task_count--; 146 } 147 148 static ACPI_STATUS 149 acpi_task_enqueue(int priority, ACPI_OSD_EXEC_CALLBACK Function, void *Context) 150 { 151 struct acpi_task_ctx *at; 152 int i; 153 154 for (at = NULL, i = 0; i < acpi_max_tasks; i++) 155 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_FREE, 156 ACPI_TASK_USED)) { 157 at = &acpi_tasks[i]; 158 acpi_task_count++; 159 break; 160 } 161 162 if (i > acpi_tasks_hiwater) 163 atomic_cmpset_int(&acpi_tasks_hiwater, acpi_tasks_hiwater, i); 164 165 if (at == NULL) { 166 printf("AcpiOsExecute: failed to enqueue task, consider increasing " 167 "the debug.acpi.max_tasks tunable\n"); 168 return (AE_NO_MEMORY); 169 } 170 171 TASK_INIT(&at->at_task, priority, acpi_task_execute, at); 172 at->at_function = Function; 173 at->at_context = Context; 174 175 /* 176 * If the task queue is ready, enqueue it now. 177 */ 178 if (acpi_taskq_started) { 179 atomic_set_int(&at->at_flag, ACPI_TASK_ENQUEUED); 180 taskqueue_enqueue(acpi_taskq, &at->at_task); 181 return (AE_OK); 182 } 183 if (bootverbose) 184 printf("AcpiOsExecute: task queue not started\n"); 185 186 return (AE_OK); 187 } 188 189 /* 190 * This function may be called in interrupt context, i.e. when a GPE fires. 191 * We allocate and queue a task for one of our taskqueue threads to process. 192 */ 193 ACPI_STATUS 194 AcpiOsExecute(ACPI_EXECUTE_TYPE Type, ACPI_OSD_EXEC_CALLBACK Function, 195 void *Context) 196 { 197 ACPI_STATUS status; 198 int pri; 199 200 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 201 202 if (Function == NULL) 203 return_ACPI_STATUS(AE_BAD_PARAMETER); 204 205 switch (Type) { 206 case OSL_GPE_HANDLER: 207 case OSL_NOTIFY_HANDLER: 208 /* 209 * Run GPEs and Notifies at the same priority. This allows 210 * Notifies that are generated by running a GPE's method (e.g., _L00) 211 * to not be pre-empted by a later GPE that arrives during the 212 * Notify handler execution. 213 */ 214 pri = 10; 215 break; 216 case OSL_GLOBAL_LOCK_HANDLER: 217 case OSL_EC_POLL_HANDLER: 218 case OSL_EC_BURST_HANDLER: 219 pri = 5; 220 break; 221 case OSL_DEBUGGER_MAIN_THREAD: 222 case OSL_DEBUGGER_EXEC_THREAD: 223 pri = 0; 224 break; 225 default: 226 return_ACPI_STATUS(AE_BAD_PARAMETER); 227 } 228 229 status = acpi_task_enqueue(pri, Function, Context); 230 return_ACPI_STATUS(status); 231 } 232 233 void 234 AcpiOsWaitEventsComplete(void) 235 { 236 int i; 237 238 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 239 240 for (i = 0; i < acpi_max_tasks; i++) 241 if ((atomic_load_acq_int(&acpi_tasks[i].at_flag) & 242 ACPI_TASK_ENQUEUED) != 0) 243 taskqueue_drain(acpi_taskq, &acpi_tasks[i].at_task); 244 return_VOID; 245 } 246 247 void 248 AcpiOsSleep(UINT64 Milliseconds) 249 { 250 int timo; 251 252 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 253 254 timo = Milliseconds * hz / 1000; 255 256 /* 257 * If requested sleep time is less than our hz resolution, use 258 * DELAY instead for better granularity. 259 */ 260 if (timo > 0) 261 pause("acpislp", timo); 262 else 263 DELAY(Milliseconds * 1000); 264 265 return_VOID; 266 } 267 268 /* 269 * Return the current time in 100 nanosecond units 270 */ 271 UINT64 272 AcpiOsGetTimer(void) 273 { 274 struct bintime bt; 275 UINT64 t; 276 277 /* XXX During early boot there is no (decent) timer available yet. */ 278 KASSERT(cold == 0, ("acpi: timer op not yet supported during boot")); 279 280 binuptime(&bt); 281 t = (uint64_t)bt.sec * 10000000; 282 t += ((uint64_t)10000000 * (uint32_t)(bt.frac >> 32)) >> 32; 283 284 return (t); 285 } 286 287 void 288 AcpiOsStall(UINT32 Microseconds) 289 { 290 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 291 292 DELAY(Microseconds); 293 return_VOID; 294 } 295 296 ACPI_THREAD_ID 297 AcpiOsGetThreadId(void) 298 { 299 300 /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */ 301 302 /* Returning 0 is not allowed. */ 303 return (curthread->td_tid); 304 } 305