1 /*- 2 * Copyright (c) 2000 Michael Smith 3 * Copyright (c) 2000 BSDi 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 /* 29 * 6.3 : Scheduling services 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "opt_acpi.h" 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/bus.h> 39 #include <sys/interrupt.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/acpi.h> 47 #include <dev/acpica/acpivar.h> 48 49 #define _COMPONENT ACPI_OS_SERVICES 50 ACPI_MODULE_NAME("SCHEDULE") 51 52 /* 53 * Allow the user to tune the number of task threads we start. It seems 54 * some systems have problems with increased parallelism. 55 */ 56 static int acpi_max_threads = ACPI_MAX_THREADS; 57 TUNABLE_INT("debug.acpi.max_threads", &acpi_max_threads); 58 59 MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task"); 60 61 struct acpi_task_ctx { 62 struct task at_task; 63 ACPI_OSD_EXEC_CALLBACK at_function; 64 void *at_context; 65 }; 66 67 TASKQUEUE_DEFINE(acpi, taskqueue_thread_enqueue, &taskqueue_acpi, 68 taskqueue_start_threads(&taskqueue_acpi, acpi_max_threads, PWAIT, 69 "acpi_task")); 70 71 /* 72 * Bounce through this wrapper function since ACPI-CA doesn't understand 73 * the pending argument for its callbacks. 74 */ 75 static void 76 acpi_task_execute(void *context, int pending) 77 { 78 struct acpi_task_ctx *at; 79 80 at = (struct acpi_task_ctx *)context; 81 at->at_function(at->at_context); 82 free(at, M_ACPITASK); 83 } 84 85 /* 86 * This function may be called in interrupt context, i.e. when a GPE fires. 87 * We allocate and queue a task for one of our taskqueue threads to process. 88 */ 89 ACPI_STATUS 90 AcpiOsExecute(ACPI_EXECUTE_TYPE Type, ACPI_OSD_EXEC_CALLBACK Function, 91 void *Context) 92 { 93 struct acpi_task_ctx *at; 94 int pri; 95 96 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 97 98 if (Function == NULL) 99 return_ACPI_STATUS (AE_BAD_PARAMETER); 100 101 at = malloc(sizeof(*at), M_ACPITASK, M_NOWAIT); 102 if (at == NULL) 103 return_ACPI_STATUS (AE_NO_MEMORY); 104 105 at->at_function = Function; 106 at->at_context = Context; 107 switch (Type) { 108 case OSL_GPE_HANDLER: 109 case OSL_NOTIFY_HANDLER: 110 /* 111 * Run GPEs and Notifies at the same priority. This allows 112 * Notifies that are generated by running a GPE's method (e.g., _L00) 113 * to not be pre-empted by a later GPE that arrives during the 114 * Notify handler execution. 115 */ 116 pri = 10; 117 break; 118 case OSL_GLOBAL_LOCK_HANDLER: 119 case OSL_EC_POLL_HANDLER: 120 case OSL_EC_BURST_HANDLER: 121 pri = 5; 122 break; 123 case OSL_DEBUGGER_THREAD: 124 pri = 0; 125 break; 126 default: 127 free(at, M_ACPITASK); 128 return_ACPI_STATUS (AE_BAD_PARAMETER); 129 } 130 131 TASK_INIT(&at->at_task, pri, acpi_task_execute, at); 132 taskqueue_enqueue(taskqueue_acpi, &at->at_task); 133 134 return_ACPI_STATUS (AE_OK); 135 } 136 137 void 138 AcpiOsSleep(ACPI_INTEGER Milliseconds) 139 { 140 int timo; 141 142 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 143 144 timo = Milliseconds * hz / 1000; 145 146 /* 147 * If requested sleep time is less than our hz resolution, use 148 * DELAY instead for better granularity. 149 */ 150 if (timo > 0) 151 pause("acpislp", timo); 152 else 153 DELAY(Milliseconds * 1000); 154 155 return_VOID; 156 } 157 158 /* 159 * Return the current time in 100 nanosecond units 160 */ 161 UINT64 162 AcpiOsGetTimer(void) 163 { 164 struct bintime bt; 165 UINT64 t; 166 167 /* XXX During early boot there is no (decent) timer available yet. */ 168 if (cold) 169 panic("acpi: timer op not yet supported during boot"); 170 171 binuptime(&bt); 172 t = ((UINT64)10000000 * (uint32_t)(bt.frac >> 32)) >> 32; 173 t += bt.sec * 10000000; 174 175 return (t); 176 } 177 178 void 179 AcpiOsStall(UINT32 Microseconds) 180 { 181 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 182 183 DELAY(Microseconds); 184 return_VOID; 185 } 186 187 ACPI_THREAD_ID 188 AcpiOsGetThreadId(void) 189 { 190 struct proc *p; 191 192 /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */ 193 194 p = curproc; 195 KASSERT(p != NULL, ("%s: curproc is NULL!", __func__)); 196 197 /* Returning 0 is not allowed. */ 198 return (p->p_pid + 1); 199 } 200