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D61548.1794761803.diff
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diff --git a/sys/dev/acpica/Osd/OsdSchedule.c b/sys/dev/acpica/Osd/OsdSchedule.c
--- a/sys/dev/acpica/Osd/OsdSchedule.c
+++ b/sys/dev/acpica/Osd/OsdSchedule.c
@@ -83,7 +83,6 @@
int at_flag;
#define ACPI_TASK_FREE 0
#define ACPI_TASK_USED 1
-#define ACPI_TASK_ENQUEUED 2
};
struct taskqueue *acpi_taskq;
@@ -91,11 +90,12 @@
static int acpi_taskq_started;
/*
- * Preallocate some memory for tasks early enough.
- * malloc(9) cannot be used with spin lock held.
+ * Preallocate memory for tasks, as tasks can be posted from interrupt contexts
+ * where malloc(9) cannot be called, and initialize the taskqueue so we can
+ * enqueue tasks on behalf of drivers.
*/
static void
-acpi_task_init(void *arg)
+acpi_taskq_init(void *arg)
{
if (acpi_max_tasks < 0) {
acpi_max_tasks = ACPI_MAX_TASKS;
@@ -105,39 +105,33 @@
acpi_tasks = malloc(sizeof(*acpi_tasks) * acpi_max_tasks, M_ACPITASK,
M_WAITOK | M_ZERO);
-}
-
-SYSINIT(acpi_tasks, SI_SUB_DRIVERS, SI_ORDER_FIRST, acpi_task_init, NULL);
-
-/*
- * Initialize ACPI task queue.
- */
-static void
-acpi_taskq_init(void *arg)
-{
- int boot_tasks_nb, i;
-
acpi_taskq = taskqueue_create_fast("acpi_task", M_WAITOK,
&taskqueue_thread_enqueue, &acpi_taskq);
+}
+
+SYSINIT(acpi_tasks, SI_SUB_DRIVERS, SI_ORDER_FIRST, acpi_taskq_init, NULL);
+
+/*
+ * Start processing of the taskqueue.
+ */
+static void
+acpi_taskq_kick(void *arg)
+{
+ int boot_tasks_nb;
+
+ if (bootverbose && (boot_tasks_nb = atomic_load_int(&acpi_boot_tasks_nb),
+ boot_tasks_nb > 0))
+ printf("ACPI: Unleashing pending %d tasks\n", boot_tasks_nb);
if (acpi_max_threads < 1)
acpi_max_threads = 1;
taskqueue_start_threads(&acpi_taskq, acpi_max_threads, PWAIT, "acpi_task");
- boot_tasks_nb = atomic_load_int(&acpi_boot_tasks_nb);
- if (boot_tasks_nb > 0) {
- if (bootverbose)
- printf("AcpiOsExecute: enqueue %d pending tasks\n", boot_tasks_nb);
- for (i = 0; i < acpi_max_tasks; i++)
- if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_USED,
- ACPI_TASK_USED | ACPI_TASK_ENQUEUED))
- taskqueue_enqueue(acpi_taskq, &acpi_tasks[i].at_task);
- }
- acpi_taskq_started = 1;
+ atomic_store_int(&acpi_taskq_started, 1);
}
-SYSINIT(acpi_taskq, SI_SUB_KICK_SCHEDULER, SI_ORDER_ANY, acpi_taskq_init, NULL);
+SYSINIT(acpi_taskq, SI_SUB_KICK_SCHEDULER, SI_ORDER_ANY, acpi_taskq_kick, NULL);
/*
* Bounce through this wrapper function since ACPI-CA doesn't understand
@@ -150,12 +144,13 @@
at = (struct acpi_task_ctx *)context;
at->at_function(at->at_context);
- atomic_clear_int(&at->at_flag, ACPI_TASK_USED | ACPI_TASK_ENQUEUED);
+ atomic_store_int(&at->at_flag, ACPI_TASK_FREE);
}
static ACPI_STATUS
acpi_task_enqueue(int priority, ACPI_OSD_EXEC_CALLBACK Function, void *Context)
{
+ const int started = atomic_load_int(&acpi_taskq_started);
struct acpi_task_ctx *at;
int *high_water_p;
int high_water, i;
@@ -169,8 +164,7 @@
}
/* Update the appropriate high water mark. */
- high_water_p = acpi_taskq_started ? &acpi_tasks_high_water :
- &acpi_boot_tasks_nb;
+ high_water_p = started ? &acpi_tasks_high_water : &acpi_boot_tasks_nb;
while (high_water = atomic_load_int(high_water_p), i + 1 > high_water) {
if (atomic_cmpset_int(high_water_p, high_water, i + 1))
break;
@@ -178,25 +172,18 @@
}
if (at == NULL) {
- printf("AcpiOsExecute: failed to enqueue task, consider increasing "
- "the debug.acpi.max_tasks tunable\n");
+ printf("AcpiOsExecute: Failed to enqueue task! Consider increasing "
+ "the 'debug.acpi.max_tasks' tunable.\n");
return (AE_NO_MEMORY);
}
TASK_INIT(&at->at_task, priority, acpi_task_execute, at);
at->at_function = Function;
at->at_context = Context;
+ taskqueue_enqueue(acpi_taskq, &at->at_task);
- /*
- * If the task queue is ready, enqueue it now.
- */
- if (acpi_taskq_started) {
- atomic_set_int(&at->at_flag, ACPI_TASK_ENQUEUED);
- taskqueue_enqueue(acpi_taskq, &at->at_task);
- return (AE_OK);
- }
- if (bootverbose)
- printf("AcpiOsExecute: task queue not started\n");
+ if (bootverbose && !started)
+ printf("AcpiOsExecute: Task enqueued but processing not started yet\n");
return (AE_OK);
}
@@ -248,15 +235,21 @@
void
AcpiOsWaitEventsComplete(void)
{
- int i;
+ static bool warning_printed = false;
- ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
+ ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
- for (i = 0; i < acpi_max_tasks; i++)
- if ((atomic_load_acq_int(&acpi_tasks[i].at_flag) &
- ACPI_TASK_ENQUEUED) != 0)
- taskqueue_drain(acpi_taskq, &acpi_tasks[i].at_task);
- return_VOID;
+ if (!atomic_load_int(&acpi_taskq_started) &&
+ atomic_load_int(&acpi_boot_tasks_nb) > 0) {
+ if (!warning_printed) {
+ warning_printed = true;
+ printf("%s: Task processing not started, ignoring request\n",
+ __func__);
+ }
+ } else
+ taskqueue_drain_all(acpi_taskq);
+
+ return_VOID;
}
void

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