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 #include "opt_acpi.h"
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/bus.h>
38 #include <sys/kernel.h>
39 #include <sys/kthread.h>
40 #include <sys/malloc.h>
41 #include <sys/proc.h>
42 #include <sys/taskqueue.h>
43
44 #include <contrib/dev/acpica/include/acpi.h>
45 #include <contrib/dev/acpica/include/accommon.h>
46
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 maximum number of tasks we may enqueue.
54 */
55 static int acpi_max_tasks = ACPI_MAX_TASKS;
56 SYSCTL_INT(_debug_acpi, OID_AUTO, max_tasks, CTLFLAG_RDTUN, &acpi_max_tasks,
57 0, "Maximum acpi tasks");
58
59 /*
60 * Track and report the system's demand for task slots.
61 */
62 static int acpi_tasks_hiwater;
63 SYSCTL_INT(_debug_acpi, OID_AUTO, tasks_hiwater, CTLFLAG_RD,
64 &acpi_tasks_hiwater, 1, "Peak demand for ACPI event task slots.");
65
66 /*
67 * Allow the user to tune the number of task threads we start. It seems
68 * some systems have problems with increased parallelism.
69 */
70 static int acpi_max_threads = ACPI_MAX_THREADS;
71 SYSCTL_INT(_debug_acpi, OID_AUTO, max_threads, CTLFLAG_RDTUN, &acpi_max_threads,
72 0, "Maximum acpi threads");
73
74 static MALLOC_DEFINE(M_ACPITASK, "acpitask", "ACPI deferred task");
75
76 struct acpi_task_ctx {
77 struct task at_task;
78 ACPI_OSD_EXEC_CALLBACK at_function;
79 void *at_context;
80 int at_flag;
81 #define ACPI_TASK_FREE 0
82 #define ACPI_TASK_USED 1
83 #define ACPI_TASK_ENQUEUED 2
84 };
85
86 struct taskqueue *acpi_taskq;
87 static struct acpi_task_ctx *acpi_tasks;
88 static int acpi_task_count;
89 static int acpi_taskq_started;
90
91 /*
92 * Preallocate some memory for tasks early enough.
93 * malloc(9) cannot be used with spin lock held.
94 */
95 static void
acpi_task_init(void * arg)96 acpi_task_init(void *arg)
97 {
98
99 acpi_tasks = malloc(sizeof(*acpi_tasks) * acpi_max_tasks, M_ACPITASK,
100 M_WAITOK | M_ZERO);
101 }
102
103 SYSINIT(acpi_tasks, SI_SUB_DRIVERS, SI_ORDER_FIRST, acpi_task_init, NULL);
104
105 /*
106 * Initialize ACPI task queue.
107 */
108 static void
acpi_taskq_init(void * arg)109 acpi_taskq_init(void *arg)
110 {
111 int i;
112
113 acpi_taskq = taskqueue_create_fast("acpi_task", M_NOWAIT,
114 &taskqueue_thread_enqueue, &acpi_taskq);
115 taskqueue_start_threads(&acpi_taskq, acpi_max_threads, PWAIT, "acpi_task");
116 if (acpi_task_count > 0) {
117 if (bootverbose)
118 printf("AcpiOsExecute: enqueue %d pending tasks\n",
119 acpi_task_count);
120 for (i = 0; i < acpi_max_tasks; i++)
121 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_USED,
122 ACPI_TASK_USED | ACPI_TASK_ENQUEUED))
123 taskqueue_enqueue(acpi_taskq, &acpi_tasks[i].at_task);
124 }
125 acpi_taskq_started = 1;
126 }
127
128 SYSINIT(acpi_taskq, SI_SUB_KICK_SCHEDULER, SI_ORDER_ANY, acpi_taskq_init, NULL);
129
130 /*
131 * Bounce through this wrapper function since ACPI-CA doesn't understand
132 * the pending argument for its callbacks.
133 */
134 static void
acpi_task_execute(void * context,int pending)135 acpi_task_execute(void *context, int pending)
136 {
137 struct acpi_task_ctx *at;
138
139 at = (struct acpi_task_ctx *)context;
140 at->at_function(at->at_context);
141 atomic_clear_int(&at->at_flag, ACPI_TASK_USED | ACPI_TASK_ENQUEUED);
142 acpi_task_count--;
143 }
144
145 static ACPI_STATUS
acpi_task_enqueue(int priority,ACPI_OSD_EXEC_CALLBACK Function,void * Context)146 acpi_task_enqueue(int priority, ACPI_OSD_EXEC_CALLBACK Function, void *Context)
147 {
148 struct acpi_task_ctx *at;
149 int i;
150
151 for (at = NULL, i = 0; i < acpi_max_tasks; i++)
152 if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_FREE,
153 ACPI_TASK_USED)) {
154 at = &acpi_tasks[i];
155 acpi_task_count++;
156 break;
157 }
158
159 if (i > acpi_tasks_hiwater)
160 atomic_cmpset_int(&acpi_tasks_hiwater, acpi_tasks_hiwater, i);
161
162 if (at == NULL) {
163 printf("AcpiOsExecute: failed to enqueue task, consider increasing "
164 "the debug.acpi.max_tasks tunable\n");
165 return (AE_NO_MEMORY);
166 }
167
168 TASK_INIT(&at->at_task, priority, acpi_task_execute, at);
169 at->at_function = Function;
170 at->at_context = Context;
171
172 /*
173 * If the task queue is ready, enqueue it now.
174 */
175 if (acpi_taskq_started) {
176 atomic_set_int(&at->at_flag, ACPI_TASK_ENQUEUED);
177 taskqueue_enqueue(acpi_taskq, &at->at_task);
178 return (AE_OK);
179 }
180 if (bootverbose)
181 printf("AcpiOsExecute: task queue not started\n");
182
183 return (AE_OK);
184 }
185
186 /*
187 * This function may be called in interrupt context, i.e. when a GPE fires.
188 * We allocate and queue a task for one of our taskqueue threads to process.
189 */
190 ACPI_STATUS
AcpiOsExecute(ACPI_EXECUTE_TYPE Type,ACPI_OSD_EXEC_CALLBACK Function,void * Context)191 AcpiOsExecute(ACPI_EXECUTE_TYPE Type, ACPI_OSD_EXEC_CALLBACK Function,
192 void *Context)
193 {
194 ACPI_STATUS status;
195 int pri;
196
197 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
198
199 if (Function == NULL)
200 return_ACPI_STATUS(AE_BAD_PARAMETER);
201
202 switch (Type) {
203 case OSL_GPE_HANDLER:
204 case OSL_NOTIFY_HANDLER:
205 /*
206 * Run GPEs and Notifies at the same priority. This allows
207 * Notifies that are generated by running a GPE's method (e.g., _L00)
208 * to not be pre-empted by a later GPE that arrives during the
209 * Notify handler execution.
210 */
211 pri = 10;
212 break;
213 case OSL_GLOBAL_LOCK_HANDLER:
214 case OSL_EC_POLL_HANDLER:
215 case OSL_EC_BURST_HANDLER:
216 pri = 5;
217 break;
218 case OSL_DEBUGGER_MAIN_THREAD:
219 case OSL_DEBUGGER_EXEC_THREAD:
220 pri = 0;
221 break;
222 default:
223 return_ACPI_STATUS(AE_BAD_PARAMETER);
224 }
225
226 status = acpi_task_enqueue(pri, Function, Context);
227 return_ACPI_STATUS(status);
228 }
229
230 void
AcpiOsWaitEventsComplete(void)231 AcpiOsWaitEventsComplete(void)
232 {
233 int i;
234
235 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
236
237 for (i = 0; i < acpi_max_tasks; i++)
238 if ((atomic_load_acq_int(&acpi_tasks[i].at_flag) &
239 ACPI_TASK_ENQUEUED) != 0)
240 taskqueue_drain(acpi_taskq, &acpi_tasks[i].at_task);
241 return_VOID;
242 }
243
244 void
AcpiOsSleep(UINT64 Milliseconds)245 AcpiOsSleep(UINT64 Milliseconds)
246 {
247 int timo;
248
249 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
250
251 timo = Milliseconds * hz / 1000;
252
253 /*
254 * If requested sleep time is less than our hz resolution, use
255 * DELAY instead for better granularity.
256 */
257 if (timo > 0)
258 pause("acpislp", timo);
259 else
260 DELAY(Milliseconds * 1000);
261
262 return_VOID;
263 }
264
265 /*
266 * Return the current time in 100 nanosecond units
267 */
268 UINT64
AcpiOsGetTimer(void)269 AcpiOsGetTimer(void)
270 {
271 struct bintime bt;
272 UINT64 t;
273
274 binuptime(&bt);
275 t = (uint64_t)bt.sec * 10000000;
276 t += ((uint64_t)10000000 * (uint32_t)(bt.frac >> 32)) >> 32;
277
278 return (t);
279 }
280
281 void
AcpiOsStall(UINT32 Microseconds)282 AcpiOsStall(UINT32 Microseconds)
283 {
284 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
285
286 DELAY(Microseconds);
287 return_VOID;
288 }
289
290 ACPI_THREAD_ID
AcpiOsGetThreadId(void)291 AcpiOsGetThreadId(void)
292 {
293
294 /* XXX do not add ACPI_FUNCTION_TRACE here, results in recursive call. */
295
296 /* Returning 0 is not allowed. */
297 return (curthread->td_tid);
298 }
299