/*
- * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 1998-2000, 2009-2010 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * @APPLE_LICENSE_HEADER_START@
- *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
+#include <libkern/OSDebug.h>
+
#include <IOKit/IOCommandGate.h>
#include <IOKit/IOWorkLoop.h>
#include <IOKit/IOReturn.h>
#include <IOKit/IOTimeStamp.h>
+#include <IOKit/IOKitDebug.h>
#define super IOEventSource
OSDefineMetaClassAndStructors(IOCommandGate, IOEventSource)
+#if __LP64__
OSMetaClassDefineReservedUnused(IOCommandGate, 0);
+#else
+OSMetaClassDefineReservedUsed(IOCommandGate, 0);
+#endif
OSMetaClassDefineReservedUnused(IOCommandGate, 1);
OSMetaClassDefineReservedUnused(IOCommandGate, 2);
OSMetaClassDefineReservedUnused(IOCommandGate, 3);
OSMetaClassDefineReservedUnused(IOCommandGate, 6);
OSMetaClassDefineReservedUnused(IOCommandGate, 7);
-bool IOCommandGate::checkForWork() { return false; }
+#if IOKITSTATS
+
+#define IOStatisticsInitializeCounter() \
+do { \
+ IOStatistics::setCounterType(IOEventSource::reserved->counter, kIOStatisticsCommandGateCounter); \
+} while (0)
+
+#define IOStatisticsActionCall() \
+do { \
+ IOStatistics::countCommandGateActionCall(IOEventSource::reserved->counter); \
+} while (0)
+
+#else
-bool IOCommandGate::init(OSObject *inOwner, Action inAction)
+#define IOStatisticsInitializeCounter()
+#define IOStatisticsActionCall()
+
+#endif /* IOKITSTATS */
+
+bool
+IOCommandGate::init(OSObject *inOwner, Action inAction)
{
- return super::init(inOwner, (IOEventSource::Action) inAction);
+ bool res = super::init(inOwner, (IOEventSource::Action) inAction);
+ if (res) {
+ IOStatisticsInitializeCounter();
+ }
+
+ return res;
}
IOCommandGate *
IOCommandGate::commandGate(OSObject *inOwner, Action inAction)
{
- IOCommandGate *me = new IOCommandGate;
+ IOCommandGate *me = new IOCommandGate;
- if (me && !me->init(inOwner, inAction)) {
- me->release();
- return 0;
- }
+ if (me && !me->init(inOwner, inAction)) {
+ me->release();
+ return 0;
+ }
- return me;
+ return me;
}
-IOReturn IOCommandGate::runCommand(void *arg0, void *arg1,
- void *arg2, void *arg3)
+/* virtual */ void
+IOCommandGate::disable()
{
- IOReturn res;
+ if (workLoop && !workLoop->inGate()) {
+ OSReportWithBacktrace("IOCommandGate::disable() called when not gated");
+ }
- if (!enabled)
- return kIOReturnNotPermitted;
+ super::disable();
+}
- if (!action)
- return kIOReturnNoResources;
+/* virtual */ void
+IOCommandGate::enable()
+{
+ if (workLoop) {
+ closeGate();
+ super::enable();
+ wakeupGate(&enabled, /* oneThread */ false); // Unblock sleeping threads
+ openGate();
+ }
+}
- // closeGate is recursive so don't worry if we already hold the lock.
- IOTimeStampConstant(IODBG_CMDQ(IOCMDQ_ACTION),
- (unsigned int) action, (unsigned int) owner);
+/* virtual */ void
+IOCommandGate::free()
+{
+ if (workLoop) {
+ setWorkLoop(0);
+ }
+ super::free();
+}
- closeGate();
- res = (*(Action) action)(owner, arg0, arg1, arg2, arg3);
- openGate();
+enum{
+ kSleepersRemoved = 0x00000001,
+ kSleepersWaitEnabled = 0x00000002,
+ kSleepersActions = 0x00000100,
+ kSleepersActionsMask = 0xffffff00,
+};
- return res;
+/* virtual */ void
+IOCommandGate::setWorkLoop(IOWorkLoop *inWorkLoop)
+{
+ IOWorkLoop * wl;
+ uintptr_t * sleepersP = (uintptr_t *) &reserved;
+ bool defer;
+
+ if (!inWorkLoop && (wl = workLoop)) { // tearing down
+ wl->closeGate();
+ *sleepersP |= kSleepersRemoved;
+ while (*sleepersP & kSleepersWaitEnabled) {
+ thread_wakeup_with_result(&enabled, THREAD_INTERRUPTED);
+ sleepGate(sleepersP, THREAD_UNINT);
+ }
+ *sleepersP &= ~kSleepersWaitEnabled;
+ defer = (0 != (kSleepersActionsMask & *sleepersP));
+ if (!defer) {
+ super::setWorkLoop(0);
+ *sleepersP &= ~kSleepersRemoved;
+ }
+ wl->openGate();
+ return;
+ }
+
+ super::setWorkLoop(inWorkLoop);
}
-IOReturn IOCommandGate::runAction(Action inAction,
- void *arg0, void *arg1,
- void *arg2, void *arg3)
+IOReturn
+IOCommandGate::runCommand(void *arg0, void *arg1,
+ void *arg2, void *arg3)
{
- IOReturn res;
-
- if (!enabled)
- return kIOReturnNotPermitted;
-
- if (!inAction)
- return kIOReturnBadArgument;
+ return runAction((Action) action, arg0, arg1, arg2, arg3);
+}
- IOTimeStampConstant(IODBG_CMDQ(IOCMDQ_ACTION),
- (unsigned int) inAction, (unsigned int) owner);
+IOReturn
+IOCommandGate::attemptCommand(void *arg0, void *arg1,
+ void *arg2, void *arg3)
+{
+ return attemptAction((Action) action, arg0, arg1, arg2, arg3);
+}
- // closeGate is recursive so don't worry if we already hold the lock.
- closeGate();
- res = (*inAction)(owner, arg0, arg1, arg2, arg3);
- openGate();
- return res;
+static IOReturn
+IOCommandGateActionToBlock(OSObject *owner,
+ void *arg0, void *arg1,
+ void *arg2, void *arg3)
+{
+ return ((IOEventSource::ActionBlock) arg0)();
}
-IOReturn IOCommandGate::attemptCommand(void *arg0, void *arg1,
- void *arg2, void *arg3)
+IOReturn
+IOCommandGate::runActionBlock(ActionBlock action)
{
- IOReturn res;
+ return runAction(&IOCommandGateActionToBlock, action);
+}
- if (!enabled)
- return kIOReturnNotPermitted;
+IOReturn
+IOCommandGate::runAction(Action inAction,
+ void *arg0, void *arg1,
+ void *arg2, void *arg3)
+{
+ IOWorkLoop * wl;
+ uintptr_t * sleepersP;
+
+ if (!inAction) {
+ return kIOReturnBadArgument;
+ }
+ if (!(wl = workLoop)) {
+ return kIOReturnNotReady;
+ }
+
+ // closeGate is recursive needn't worry if we already hold the lock.
+ wl->closeGate();
+ sleepersP = (uintptr_t *) &reserved;
+
+ // If the command gate is disabled and we aren't on the workloop thread
+ // itself then sleep until we get enabled.
+ IOReturn res;
+ if (!wl->onThread()) {
+ while (!enabled) {
+ IOReturn sleepResult = kIOReturnSuccess;
+ if (workLoop) {
+ *sleepersP |= kSleepersWaitEnabled;
+ sleepResult = wl->sleepGate(&enabled, THREAD_INTERRUPTIBLE);
+ *sleepersP &= ~kSleepersWaitEnabled;
+ }
+ bool wakeupTearDown = (!workLoop || (0 != (*sleepersP & kSleepersRemoved)));
+ if ((kIOReturnSuccess != sleepResult) || wakeupTearDown) {
+ wl->openGate();
+
+ if (wakeupTearDown) {
+ wl->wakeupGate(sleepersP, false); // No further resources used
+ }
+ return kIOReturnAborted;
+ }
+ }
+ }
+
+ bool trace = (gIOKitTrace & kIOTraceCommandGates) ? true : false;
+
+ if (trace) {
+ IOTimeStampStartConstant(IODBG_CMDQ(IOCMDQ_ACTION),
+ VM_KERNEL_ADDRHIDE(inAction), VM_KERNEL_ADDRHIDE(owner));
+ }
+
+ IOStatisticsActionCall();
+
+ // Must be gated and on the work loop or enabled
+
+ *sleepersP += kSleepersActions;
+ res = (*inAction)(owner, arg0, arg1, arg2, arg3);
+ *sleepersP -= kSleepersActions;
+
+ if (trace) {
+ IOTimeStampEndConstant(IODBG_CMDQ(IOCMDQ_ACTION),
+ VM_KERNEL_ADDRHIDE(inAction), VM_KERNEL_ADDRHIDE(owner));
+ }
+
+ if (kSleepersRemoved == ((kSleepersActionsMask | kSleepersRemoved) & *sleepersP)) {
+ // no actions outstanding
+ *sleepersP &= ~kSleepersRemoved;
+ super::setWorkLoop(0);
+ }
+
+ wl->openGate();
+
+ return res;
+}
- if (!action)
- return kIOReturnNoResources;
+IOReturn
+IOCommandGate::attemptAction(Action inAction,
+ void *arg0, void *arg1,
+ void *arg2, void *arg3)
+{
+ IOReturn res;
+ IOWorkLoop * wl;
- // Try to hold the lock if can't get return immediately.
- if (!tryCloseGate())
- return kIOReturnCannotLock;
+ if (!inAction) {
+ return kIOReturnBadArgument;
+ }
+ if (!(wl = workLoop)) {
+ return kIOReturnNotReady;
+ }
- // closeGate is recursive so don't worry if we already hold the lock.
- IOTimeStampConstant(IODBG_CMDQ(IOCMDQ_ACTION),
- (unsigned int) action, (unsigned int) owner);
+ // Try to close the gate if can't get return immediately.
+ if (!wl->tryCloseGate()) {
+ return kIOReturnCannotLock;
+ }
- res = (*(Action) action)(owner, arg0, arg1, arg2, arg3);
- openGate();
+ // If the command gate is disabled then sleep until we get a wakeup
+ if (!wl->onThread() && !enabled) {
+ res = kIOReturnNotPermitted;
+ } else {
+ bool trace = (gIOKitTrace & kIOTraceCommandGates) ? true : false;
- return res;
-}
+ if (trace) {
+ IOTimeStampStartConstant(IODBG_CMDQ(IOCMDQ_ACTION),
+ VM_KERNEL_ADDRHIDE(inAction), VM_KERNEL_ADDRHIDE(owner));
+ }
-IOReturn IOCommandGate::attemptAction(Action inAction,
- void *arg0, void *arg1,
- void *arg2, void *arg3)
-{
- IOReturn res;
+ IOStatisticsActionCall();
- if (!enabled)
- return kIOReturnNotPermitted;
+ res = (*inAction)(owner, arg0, arg1, arg2, arg3);
- if (!inAction)
- return kIOReturnBadArgument;
+ if (trace) {
+ IOTimeStampEndConstant(IODBG_CMDQ(IOCMDQ_ACTION),
+ VM_KERNEL_ADDRHIDE(inAction), VM_KERNEL_ADDRHIDE(owner));
+ }
+ }
- // Try to close the gate if can't get return immediately.
- if (!tryCloseGate())
- return kIOReturnCannotLock;
+ wl->openGate();
- IOTimeStampConstant(IODBG_CMDQ(IOCMDQ_ACTION),
- (unsigned int) inAction, (unsigned int) owner);
+ return res;
+}
- res = (*inAction)(owner, arg0, arg1, arg2, arg3);
- openGate();
+IOReturn
+IOCommandGate::commandSleep(void *event, UInt32 interruptible)
+{
+ if (!workLoop->inGate()) {
+ /* The equivalent of 'msleep' while not holding the mutex is invalid */
+ panic("invalid commandSleep while not holding the gate");
+ }
- return res;
+ return sleepGate(event, interruptible);
}
-IOReturn IOCommandGate::commandSleep(void *event, UInt32 interruptible)
+IOReturn
+IOCommandGate::commandSleep(void *event, AbsoluteTime deadline, UInt32 interruptible)
{
- if (!workLoop->inGate())
- return kIOReturnNotPermitted;
+ if (!workLoop->inGate()) {
+ /* The equivalent of 'msleep' while not holding the mutex is invalid */
+ panic("invalid commandSleep while not holding the gate");
+ }
- return sleepGate(event, interruptible);
+ return sleepGate(event, deadline, interruptible);
}
-void IOCommandGate::commandWakeup(void *event, bool oneThread)
+void
+IOCommandGate::commandWakeup(void *event, bool oneThread)
{
- wakeupGate(event, oneThread);
+ wakeupGate(event, oneThread);
}
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