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 #include <machine/clock.h> 46 47 #include <contrib/dev/acpica/acpi.h> 48 #include <dev/acpica/acpivar.h> 49 50 #define _COMPONENT ACPI_OS_SERVICES 51 ACPI_MODULE_NAME("SCHEDULE") 52 53 /* 54 * Allow the user to tune the number of task threads we start. It seems 55 * some systems have problems with increased parallelism. 56 */ 57 static int acpi_max_threads = ACPI_MAX_THREADS; 58 TUNABLE_INT("debug.acpi.max_threads", &acpi_max_threads); 59 60 MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task"); 61 62 struct acpi_task_ctx { 63 struct task at_task; 64 ACPI_OSD_EXEC_CALLBACK at_function; 65 void *at_context; 66 }; 67 68 TASKQUEUE_DEFINE(acpi, taskqueue_thread_enqueue, &taskqueue_acpi, 69 taskqueue_start_threads(&taskqueue_acpi, acpi_max_threads, PWAIT, 70 "acpi_task")); 71 72 /* 73 * Bounce through this wrapper function since ACPI-CA doesn't understand 74 * the pending argument for its callbacks. 75 */ 76 static void 77 acpi_task_execute(void *context, int pending) 78 { 79 struct acpi_task_ctx *at; 80 81 at = (struct acpi_task_ctx *)context; 82 at->at_function(at->at_context); 83 free(at, M_ACPITASK); 84 } 85 86 /* 87 * This function may be called in interrupt context, i.e. when a GPE fires. 88 * We allocate and queue a task for one of our taskqueue threads to process. 89 */ 90 ACPI_STATUS 91 AcpiOsQueueForExecution(UINT32 Priority, ACPI_OSD_EXEC_CALLBACK Function, 92 void *Context) 93 { 94 struct acpi_task_ctx *at; 95 int pri; 96 97 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 98 99 if (Function == NULL) 100 return_ACPI_STATUS (AE_BAD_PARAMETER); 101 102 at = malloc(sizeof(*at), M_ACPITASK, M_NOWAIT); 103 if (at == NULL) 104 return_ACPI_STATUS (AE_NO_MEMORY); 105 106 at->at_function = Function; 107 at->at_context = Context; 108 switch (Priority) { 109 case OSD_PRIORITY_GPE: 110 pri = 4; 111 break; 112 case OSD_PRIORITY_HIGH: 113 pri = 3; 114 break; 115 case OSD_PRIORITY_MED: 116 pri = 2; 117 break; 118 case OSD_PRIORITY_LO: 119 pri = 1; 120 break; 121 default: 122 free(at, M_ACPITASK); 123 return_ACPI_STATUS (AE_BAD_PARAMETER); 124 } 125 126 TASK_INIT(&at->at_task, pri, acpi_task_execute, at); 127 taskqueue_enqueue(taskqueue_acpi, &at->at_task); 128 129 return_ACPI_STATUS (AE_OK); 130 } 131 132 void 133 AcpiOsSleep(ACPI_INTEGER Milliseconds) 134 { 135 int timo; 136 static int dummy; 137 138 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 139 140 timo = Milliseconds * hz / 1000; 141 142 /* 143 * If requested sleep time is less than our hz resolution, use 144 * DELAY instead for better granularity. 145 */ 146 if (timo > 0) 147 tsleep(&dummy, 0, "acpislp", timo); 148 else 149 DELAY(Milliseconds * 1000); 150 151 return_VOID; 152 } 153 154 /* 155 * Return the current time in 100 nanosecond units 156 */ 157 UINT64 158 AcpiOsGetTimer(void) 159 { 160 struct bintime bt; 161 UINT64 t; 162 163 /* XXX During early boot there is no (decent) timer available yet. */ 164 if (cold) 165 panic("acpi: timer op not yet supported during boot"); 166 167 binuptime(&bt); 168 t = ((UINT64)10000000 * (uint32_t)(bt.frac >> 32)) >> 32; 169 t += bt.sec * 10000000; 170 171 return (t); 172 } 173 174 void 175 AcpiOsStall(UINT32 Microseconds) 176 { 177 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 178 179 DELAY(Microseconds); 180 return_VOID; 181 } 182 183 UINT32 184 AcpiOsGetThreadId(void) 185 { 186 struct proc *p; 187 188 /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */ 189 190 p = curproc; 191 KASSERT(p != NULL, ("%s: curproc is NULL!", __func__)); 192 193 /* Returning 0 is not allowed. */ 194 return (p->p_pid + 1); 195 } 196