From f8fe689a81f906d1b91bb3220acde2a4ecb14c5b Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 05:01:46 +0200 Subject: Adding upstream version 6.0.4-dfsg. Signed-off-by: Daniel Baumann --- .../Runtime/r0drv/linux/semevent-r0drv-linux.c | 279 +++++++++++++++++++++ 1 file changed, 279 insertions(+) create mode 100644 src/VBox/Runtime/r0drv/linux/semevent-r0drv-linux.c (limited to 'src/VBox/Runtime/r0drv/linux/semevent-r0drv-linux.c') diff --git a/src/VBox/Runtime/r0drv/linux/semevent-r0drv-linux.c b/src/VBox/Runtime/r0drv/linux/semevent-r0drv-linux.c new file mode 100644 index 00000000..bbed6371 --- /dev/null +++ b/src/VBox/Runtime/r0drv/linux/semevent-r0drv-linux.c @@ -0,0 +1,279 @@ +/* $Id: semevent-r0drv-linux.c $ */ +/** @file + * IPRT - Single Release Event Semaphores, Ring-0 Driver, Linux. + */ + +/* + * Copyright (C) 2006-2019 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#define RTSEMEVENT_WITHOUT_REMAPPING +#include "the-linux-kernel.h" +#include "internal/iprt.h" +#include + +#include +#include +#include +#include +#include + +#include "waitqueue-r0drv-linux.h" +#include "internal/magics.h" + + +/********************************************************************************************************************************* +* Structures and Typedefs * +*********************************************************************************************************************************/ +/** + * Linux event semaphore. + */ +typedef struct RTSEMEVENTINTERNAL +{ + /** Magic value (RTSEMEVENT_MAGIC). */ + uint32_t volatile u32Magic; + /** The object status - !0 when signaled and 0 when reset. */ + uint32_t volatile fState; + /** Reference counter. */ + uint32_t volatile cRefs; + /** The wait queue. */ + wait_queue_head_t Head; +} RTSEMEVENTINTERNAL, *PRTSEMEVENTINTERNAL; + + + +RTDECL(int) RTSemEventCreate(PRTSEMEVENT phEventSem) +{ + return RTSemEventCreateEx(phEventSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL); +} + + +RTDECL(int) RTSemEventCreateEx(PRTSEMEVENT phEventSem, uint32_t fFlags, RTLOCKVALCLASS hClass, const char *pszNameFmt, ...) +{ + PRTSEMEVENTINTERNAL pThis; + IPRT_LINUX_SAVE_EFL_AC(); + RT_NOREF_PV(hClass); RT_NOREF_PV(pszNameFmt); + + AssertReturn(!(fFlags & ~(RTSEMEVENT_FLAGS_NO_LOCK_VAL | RTSEMEVENT_FLAGS_BOOTSTRAP_HACK)), VERR_INVALID_PARAMETER); + Assert(!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK) || (fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL)); + + pThis = (PRTSEMEVENTINTERNAL)RTMemAlloc(sizeof(*pThis)); + if (!pThis) + return VERR_NO_MEMORY; + + pThis->u32Magic = RTSEMEVENT_MAGIC; + pThis->fState = 0; + pThis->cRefs = 1; + init_waitqueue_head(&pThis->Head); + + *phEventSem = pThis; + IPRT_LINUX_RESTORE_EFL_AC(); + return VINF_SUCCESS; +} +RT_EXPORT_SYMBOL(RTSemEventCreate); + + +/** + * Retains a reference to the event semaphore. + * + * @param pThis The event semaphore. + */ +DECLINLINE(void) rtR0SemEventLnxRetain(PRTSEMEVENTINTERNAL pThis) +{ + uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs); + Assert(cRefs < 100000); NOREF(cRefs); +} + + +/** + * Releases a reference to the event semaphore. + * + * @param pThis The event semaphore. + */ +DECLINLINE(void) rtR0SemEventLnxRelease(PRTSEMEVENTINTERNAL pThis) +{ + if (RT_UNLIKELY(ASMAtomicDecU32(&pThis->cRefs) == 0)) + RTMemFree(pThis); +} + + +RTDECL(int) RTSemEventDestroy(RTSEMEVENT hEventSem) +{ + IPRT_LINUX_SAVE_EFL_AC(); + + /* + * Validate input. + */ + PRTSEMEVENTINTERNAL pThis = hEventSem; + if (pThis == NIL_RTSEMEVENT) + return VINF_SUCCESS; + AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE); + Assert(pThis->cRefs > 0); + + /* + * Invalidate it and signal the object just in case. + */ + ASMAtomicWriteU32(&pThis->u32Magic, ~RTSEMEVENT_MAGIC); + ASMAtomicWriteU32(&pThis->fState, 0); + Assert(!waitqueue_active(&pThis->Head)); + wake_up_all(&pThis->Head); + rtR0SemEventLnxRelease(pThis); + + IPRT_LINUX_RESTORE_EFL_AC(); + return VINF_SUCCESS; +} +RT_EXPORT_SYMBOL(RTSemEventDestroy); + + +RTDECL(int) RTSemEventSignal(RTSEMEVENT hEventSem) +{ + IPRT_LINUX_SAVE_EFL_AC(); + + /* + * Validate input. + */ + PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)hEventSem; + AssertPtrReturn(pThis, VERR_INVALID_HANDLE); + AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE); + rtR0SemEventLnxRetain(pThis); + + /* + * Signal the event object. + */ + ASMAtomicWriteU32(&pThis->fState, 1); + wake_up(&pThis->Head); + + rtR0SemEventLnxRelease(pThis); + IPRT_LINUX_RESTORE_EFL_AC(); + return VINF_SUCCESS; +} +RT_EXPORT_SYMBOL(RTSemEventSignal); + + +/** + * Worker for RTSemEventWaitEx and RTSemEventWaitExDebug. + * + * @returns VBox status code. + * @param pThis The event semaphore. + * @param fFlags See RTSemEventWaitEx. + * @param uTimeout See RTSemEventWaitEx. + * @param pSrcPos The source code position of the wait. + */ +static int rtR0SemEventLnxWait(PRTSEMEVENTINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout, + PCRTLOCKVALSRCPOS pSrcPos) +{ + int rc; + RT_NOREF_PV(pSrcPos); + + /* + * Validate the input. + */ + AssertPtrReturn(pThis, VERR_INVALID_PARAMETER); + AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER); + AssertReturn(RTSEMWAIT_FLAGS_ARE_VALID(fFlags), VERR_INVALID_PARAMETER); + rtR0SemEventLnxRetain(pThis); + + /* + * Try grab the event without setting up the wait. + */ + if ( 1 /** @todo check if there are someone waiting already - waitqueue_active, but then what do we do below? */ + && ASMAtomicCmpXchgU32(&pThis->fState, 0, 1)) + rc = VINF_SUCCESS; + else + { + /* + * We have to wait. + */ + IPRT_LINUX_SAVE_EFL_AC(); + RTR0SEMLNXWAIT Wait; + rc = rtR0SemLnxWaitInit(&Wait, fFlags, uTimeout, &pThis->Head); + if (RT_SUCCESS(rc)) + { + IPRT_DEBUG_SEMS_STATE(pThis, 'E'); + for (;;) + { + /* The destruction test. */ + if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENT_MAGIC)) + rc = VERR_SEM_DESTROYED; + else + { + rtR0SemLnxWaitPrepare(&Wait); + + /* Check the exit conditions. */ + if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENT_MAGIC)) + rc = VERR_SEM_DESTROYED; + else if (ASMAtomicCmpXchgU32(&pThis->fState, 0, 1)) + rc = VINF_SUCCESS; + else if (rtR0SemLnxWaitHasTimedOut(&Wait)) + rc = VERR_TIMEOUT; + else if (rtR0SemLnxWaitWasInterrupted(&Wait)) + rc = VERR_INTERRUPTED; + else + { + /* Do the wait and then recheck the conditions. */ + rtR0SemLnxWaitDoIt(&Wait); + continue; + } + } + break; + } + + rtR0SemLnxWaitDelete(&Wait); + IPRT_DEBUG_SEMS_STATE_RC(pThis, 'E', rc); + } + IPRT_LINUX_RESTORE_EFL_AC(); + } + + rtR0SemEventLnxRelease(pThis); + return rc; +} + + +RTDECL(int) RTSemEventWaitEx(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout) +{ +#ifndef RTSEMEVENT_STRICT + return rtR0SemEventLnxWait(hEventSem, fFlags, uTimeout, NULL); +#else + RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API(); + return rtR0SemEventLnxWait(hEventSem, fFlags, uTimeout, &SrcPos); +#endif +} +RT_EXPORT_SYMBOL(RTSemEventWaitEx); + + +RTDECL(int) RTSemEventWaitExDebug(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout, + RTHCUINTPTR uId, RT_SRC_POS_DECL) +{ + RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API(); + return rtR0SemEventLnxWait(hEventSem, fFlags, uTimeout, &SrcPos); +} +RT_EXPORT_SYMBOL(RTSemEventWaitExDebug); + + +RTDECL(uint32_t) RTSemEventGetResolution(void) +{ + return rtR0SemLnxWaitGetResolution(); +} +RT_EXPORT_SYMBOL(RTSemEventGetResolution); + -- cgit v1.2.3