X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/c0fea4742e91338fffdcf79f86a7c1d5e2b97eb1..eee3565979933af707c711411001ba11fe406a3c:/iokit/Kernel/IOCommandGate.cpp?ds=sidebyside diff --git a/iokit/Kernel/IOCommandGate.cpp b/iokit/Kernel/IOCommandGate.cpp index 37a5304c2..ae767744e 100644 --- a/iokit/Kernel/IOCommandGate.cpp +++ b/iokit/Kernel/IOCommandGate.cpp @@ -1,23 +1,29 @@ /* - * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 1998-2000, 2009-2010 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. + * 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. 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. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * 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, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. + * 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 @@ -25,11 +31,16 @@ #include #include #include +#include #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); @@ -38,11 +49,33 @@ OSMetaClassDefineReservedUnused(IOCommandGate, 5); 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 + +#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 * @@ -78,24 +111,41 @@ IOCommandGate::commandGate(OSObject *inOwner, Action inAction) /* virtual */ void IOCommandGate::free() { - setWorkLoop(0); + if (workLoop) setWorkLoop(0); super::free(); } +enum +{ + kSleepersRemoved = 0x00000001, + kSleepersWaitEnabled = 0x00000002, + kSleepersActions = 0x00000100, + kSleepersActionsMask = 0xffffff00, +}; + /* virtual */ void IOCommandGate::setWorkLoop(IOWorkLoop *inWorkLoop) { - uintptr_t *sleepersP = (uintptr_t *) &reserved; - if (!inWorkLoop && workLoop) { // tearing down - closeGate(); - *sleepersP |= 1; - while (*sleepersP >> 1) { + 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 = 0; - openGate(); + *sleepersP &= ~kSleepersWaitEnabled; + defer = (0 != (kSleepersActionsMask & *sleepersP)); + if (!defer) + { + super::setWorkLoop(0); + *sleepersP &= ~kSleepersRemoved; + } + wl->openGate(); + return; } - else super::setWorkLoop(inWorkLoop); } @@ -116,42 +166,69 @@ IOReturn IOCommandGate::runAction(Action inAction, void *arg0, void *arg1, void *arg2, void *arg3) { + IOWorkLoop * wl; + uintptr_t * sleepersP; + if (!inAction) return kIOReturnBadArgument; - - IOTimeStampConstant(IODBG_CMDQ(IOCMDQ_ACTION), - (unsigned int) inAction, (unsigned int) owner); + if (!(wl = workLoop)) + return kIOReturnNotReady; // closeGate is recursive needn't worry if we already hold the lock. - closeGate(); + 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 (!workLoop->onThread()) { - while (!enabled) { - uintptr_t *sleepersP = (uintptr_t *) &reserved; - - *sleepersP += 2; - IOReturn res = sleepGate(&enabled, THREAD_ABORTSAFE); - *sleepersP -= 2; - - bool wakeupTearDown = (*sleepersP & 1); - if (res || wakeupTearDown) { - openGate(); + if (!wl->onThread()) + { + while (!enabled) + { + IOReturn sleepResult = kIOReturnSuccess; + if (workLoop) + { + *sleepersP |= kSleepersWaitEnabled; + sleepResult = wl->sleepGate(&enabled, THREAD_ABORTSAFE); + *sleepersP &= ~kSleepersWaitEnabled; + } + bool wakeupTearDown = (!workLoop || (0 != (*sleepersP & kSleepersRemoved))); + if ((kIOReturnSuccess != sleepResult) || wakeupTearDown) { + wl->openGate(); if (wakeupTearDown) - commandWakeup(sleepersP); // No further resources used + 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_UNSLIDE(inAction), (uintptr_t) owner); + + IOStatisticsActionCall(); + // Must be gated and on the work loop or enabled + + *sleepersP += kSleepersActions; res = (*inAction)(owner, arg0, arg1, arg2, arg3); - openGate(); + *sleepersP -= kSleepersActions; + + if (trace) IOTimeStampEndConstant(IODBG_CMDQ(IOCMDQ_ACTION), + VM_KERNEL_UNSLIDE(inAction), (uintptr_t) owner); + if (kSleepersRemoved == ((kSleepersActionsMask|kSleepersRemoved) & *sleepersP)) + { + // no actions outstanding + *sleepersP &= ~kSleepersRemoved; + super::setWorkLoop(0); + } + + wl->openGate(); + return res; } @@ -160,25 +237,38 @@ IOReturn IOCommandGate::attemptAction(Action inAction, void *arg2, void *arg3) { IOReturn res; + IOWorkLoop * wl; if (!inAction) return kIOReturnBadArgument; + if (!(wl = workLoop)) + return kIOReturnNotReady; // Try to close the gate if can't get return immediately. - if (!tryCloseGate()) + if (!wl->tryCloseGate()) return kIOReturnCannotLock; // If the command gate is disabled then sleep until we get a wakeup - if (!workLoop->onThread() && !enabled) + if (!wl->onThread() && !enabled) res = kIOReturnNotPermitted; else { - IOTimeStampConstant(IODBG_CMDQ(IOCMDQ_ACTION), - (unsigned int) inAction, (unsigned int) owner); - - res = (*inAction)(owner, arg0, arg1, arg2, arg3); + + bool trace = ( gIOKitTrace & kIOTraceCommandGates ) ? true : false; + + if (trace) + IOTimeStampStartConstant(IODBG_CMDQ(IOCMDQ_ACTION), + VM_KERNEL_UNSLIDE(inAction), (uintptr_t) owner); + + IOStatisticsActionCall(); + + res = (*inAction)(owner, arg0, arg1, arg2, arg3); + + if (trace) + IOTimeStampEndConstant(IODBG_CMDQ(IOCMDQ_ACTION), + VM_KERNEL_UNSLIDE(inAction), (uintptr_t) owner); } - openGate(); + wl->openGate(); return res; } @@ -191,6 +281,14 @@ IOReturn IOCommandGate::commandSleep(void *event, UInt32 interruptible) return sleepGate(event, interruptible); } +IOReturn IOCommandGate::commandSleep(void *event, AbsoluteTime deadline, UInt32 interruptible) +{ + if (!workLoop->inGate()) + return kIOReturnNotPermitted; + + return sleepGate(event, deadline, interruptible); +} + void IOCommandGate::commandWakeup(void *event, bool oneThread) { wakeupGate(event, oneThread);