/* $Id: req.cpp $ */ /** @file * IPRT - Request packets */ /* * 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 * *********************************************************************************************************************************/ #include #include "internal/iprt.h" #include #include #include #include #include #include #include #include #include #include "internal/req.h" #include "internal/magics.h" /********************************************************************************************************************************* * Internal Functions * *********************************************************************************************************************************/ /** * Allocate a new request from the heap. * * @returns IPRT status code. * @param enmType The reques type. * @param fPoolOrQueue The owner type. * @param pvOwner The owner. * @param phReq Where to return the request handle. */ DECLHIDDEN(int) rtReqAlloc(RTREQTYPE enmType, bool fPoolOrQueue, void *pvOwner, PRTREQ *phReq) { PRTREQ pReq = (PRTREQ)RTMemAllocZ(sizeof(*pReq)); if (RT_UNLIKELY(!pReq)) return VERR_NO_MEMORY; /* * Create the semaphore used for waiting. */ int rc = RTSemEventCreate(&pReq->EventSem); AssertRCReturnStmt(rc, RTMemFree(pReq), rc); /* * Initialize the packet and return it. */ pReq->u32Magic = RTREQ_MAGIC; pReq->fEventSemClear = true; pReq->fSignalPushBack = true; pReq->fPoolOrQueue = fPoolOrQueue; pReq->iStatusX = VERR_RT_REQUEST_STATUS_STILL_PENDING; pReq->enmState = RTREQSTATE_ALLOCATED; pReq->pNext = NULL; pReq->uOwner.pv = pvOwner; pReq->fFlags = RTREQFLAGS_IPRT_STATUS; pReq->enmType = enmType; pReq->cRefs = 1; *phReq = pReq; return VINF_SUCCESS; } /** * Re-initializes a request when it's being recycled. * * @returns IRPT status code, the request is freed on failure. * @param pReq The request. * @param enmType The request type. */ DECLHIDDEN(int) rtReqReInit(PRTREQINT pReq, RTREQTYPE enmType) { Assert(pReq->u32Magic == RTREQ_MAGIC); Assert(pReq->enmType == RTREQTYPE_INVALID); Assert(pReq->enmState == RTREQSTATE_FREE); Assert(pReq->cRefs == 0); /* * Make sure the event sem is not signaled. */ if (!pReq->fEventSemClear) { int rc = RTSemEventWait(pReq->EventSem, 0); if (rc != VINF_SUCCESS && rc != VERR_TIMEOUT) { /* * This shall not happen, but if it does we'll just destroy * the semaphore and create a new one. */ AssertMsgFailed(("rc=%Rrc from RTSemEventWait(%#x).\n", rc, pReq->EventSem)); RTSemEventDestroy(pReq->EventSem); rc = RTSemEventCreate(&pReq->EventSem); if (RT_FAILURE(rc)) { AssertRC(rc); pReq->EventSem = NIL_RTSEMEVENT; rtReqFreeIt(pReq); return rc; } } pReq->fEventSemClear = true; } else Assert(RTSemEventWait(pReq->EventSem, 0) == VERR_TIMEOUT); /* * Initialize the packet and return it. */ ASMAtomicWriteNullPtr(&pReq->pNext); pReq->iStatusX = VERR_RT_REQUEST_STATUS_STILL_PENDING; pReq->enmState = RTREQSTATE_ALLOCATED; pReq->fFlags = RTREQFLAGS_IPRT_STATUS; pReq->enmType = enmType; pReq->cRefs = 1; return VINF_SUCCESS; } RTDECL(uint32_t) RTReqRetain(PRTREQ hReq) { PRTREQINT pReq = hReq; AssertPtrReturn(pReq, UINT32_MAX); AssertReturn(pReq->u32Magic == RTREQ_MAGIC, UINT32_MAX); return ASMAtomicIncU32(&pReq->cRefs); } RT_EXPORT_SYMBOL(RTReqRetain); /** * Frees a request. * * @param pReq The request. */ DECLHIDDEN(void) rtReqFreeIt(PRTREQINT pReq) { Assert(pReq->u32Magic == RTREQ_MAGIC); Assert(pReq->cRefs == 0); pReq->u32Magic = RTREQ_MAGIC_DEAD; RTSemEventDestroy(pReq->EventSem); pReq->EventSem = NIL_RTSEMEVENT; RTSemEventMultiDestroy(pReq->hPushBackEvt); pReq->hPushBackEvt = NIL_RTSEMEVENTMULTI; RTMemFree(pReq); } RTDECL(uint32_t) RTReqRelease(PRTREQ hReq) { /* * Ignore NULL and validate the request. */ if (!hReq) return 0; PRTREQINT pReq = hReq; AssertPtrReturn(pReq, UINT32_MAX); AssertReturn(pReq->u32Magic == RTREQ_MAGIC, UINT32_MAX); /* * Drop a reference, recycle the request when we reach 0. */ uint32_t cRefs = ASMAtomicDecU32(&pReq->cRefs); if (cRefs == 0) { /* * Check packet state. */ switch (pReq->enmState) { case RTREQSTATE_ALLOCATED: case RTREQSTATE_COMPLETED: break; default: AssertMsgFailed(("Invalid state %d!\n", pReq->enmState)); return 0; } /* * Make it a free packet and put it into one of the free packet lists. */ pReq->enmState = RTREQSTATE_FREE; pReq->iStatusX = VERR_RT_REQUEST_STATUS_FREED; pReq->enmType = RTREQTYPE_INVALID; bool fRecycled; if (pReq->fPoolOrQueue) fRecycled = rtReqPoolRecycle(pReq->uOwner.hPool, pReq); else fRecycled = rtReqQueueRecycle(pReq->uOwner.hQueue, pReq); if (!fRecycled) rtReqFreeIt(pReq); } return cRefs; } RT_EXPORT_SYMBOL(RTReqRelease); RTDECL(int) RTReqSubmit(PRTREQ hReq, RTMSINTERVAL cMillies) { LogFlow(("RTReqSubmit: hReq=%p cMillies=%d\n", hReq, cMillies)); /* * Verify the supplied package. */ PRTREQINT pReq = hReq; AssertPtrReturn(pReq, VERR_INVALID_HANDLE); AssertReturn(pReq->u32Magic == RTREQ_MAGIC, VERR_INVALID_HANDLE); AssertMsgReturn(pReq->enmState == RTREQSTATE_ALLOCATED, ("%d\n", pReq->enmState), VERR_RT_REQUEST_STATE); AssertMsgReturn(pReq->uOwner.hQueue && !pReq->pNext && pReq->EventSem != NIL_RTSEMEVENT, ("Invalid request package! Anyone cooking their own packages???\n"), VERR_RT_REQUEST_INVALID_PACKAGE); AssertMsgReturn(pReq->enmType > RTREQTYPE_INVALID && pReq->enmType < RTREQTYPE_MAX, ("Invalid package type %d valid range %d-%d inclusively. This was verified on alloc too...\n", pReq->enmType, RTREQTYPE_INVALID + 1, RTREQTYPE_MAX - 1), VERR_RT_REQUEST_INVALID_TYPE); /* * Insert it. Donate the caller's reference if RTREQFLAGS_NO_WAIT is set, * otherwise retain another reference for the queue. */ pReq->uSubmitNanoTs = RTTimeNanoTS(); pReq->enmState = RTREQSTATE_QUEUED; unsigned fFlags = ((RTREQ volatile *)pReq)->fFlags; /* volatile paranoia */ if (!(fFlags & RTREQFLAGS_NO_WAIT)) RTReqRetain(pReq); if (!pReq->fPoolOrQueue) rtReqQueueSubmit(pReq->uOwner.hQueue, pReq); else rtReqPoolSubmit(pReq->uOwner.hPool, pReq); /* * Wait and return. */ int rc = VINF_SUCCESS; if (!(fFlags & RTREQFLAGS_NO_WAIT)) rc = RTReqWait(pReq, cMillies); LogFlow(("RTReqSubmit: returns %Rrc\n", rc)); return rc; } RT_EXPORT_SYMBOL(RTReqSubmit); RTDECL(int) RTReqWait(PRTREQ hReq, RTMSINTERVAL cMillies) { LogFlow(("RTReqWait: hReq=%p cMillies=%d\n", hReq, cMillies)); /* * Verify the supplied package. */ PRTREQINT pReq = hReq; AssertPtrReturn(pReq, VERR_INVALID_HANDLE); AssertReturn(pReq->u32Magic == RTREQ_MAGIC, VERR_INVALID_HANDLE); AssertMsgReturn( pReq->enmState == RTREQSTATE_QUEUED || pReq->enmState == RTREQSTATE_PROCESSING || pReq->enmState == RTREQSTATE_COMPLETED, ("Invalid state %d\n", pReq->enmState), VERR_RT_REQUEST_STATE); AssertMsgReturn(pReq->uOwner.hQueue && pReq->EventSem != NIL_RTSEMEVENT, ("Invalid request package! Anyone cooking their own packages???\n"), VERR_RT_REQUEST_INVALID_PACKAGE); AssertMsgReturn(pReq->enmType > RTREQTYPE_INVALID && pReq->enmType < RTREQTYPE_MAX, ("Invalid package type %d valid range %d-%d inclusively. This was verified on alloc too...\n", pReq->enmType, RTREQTYPE_INVALID + 1, RTREQTYPE_MAX - 1), VERR_RT_REQUEST_INVALID_TYPE); /* * Wait on the package. */ int rc; if (cMillies != RT_INDEFINITE_WAIT) rc = RTSemEventWait(pReq->EventSem, cMillies); else { do { rc = RTSemEventWait(pReq->EventSem, RT_INDEFINITE_WAIT); Assert(rc != VERR_TIMEOUT); } while (pReq->enmState != RTREQSTATE_COMPLETED); } if (rc == VINF_SUCCESS) ASMAtomicXchgSize(&pReq->fEventSemClear, true); if (pReq->enmState == RTREQSTATE_COMPLETED) rc = VINF_SUCCESS; LogFlow(("RTReqWait: returns %Rrc\n", rc)); Assert(rc != VERR_INTERRUPTED); Assert(pReq->cRefs >= 1); return rc; } RT_EXPORT_SYMBOL(RTReqWait); RTDECL(int) RTReqGetStatus(PRTREQ hReq) { PRTREQINT pReq = hReq; AssertPtrReturn(pReq, VERR_INVALID_POINTER); AssertReturn(pReq->u32Magic == RTREQ_MAGIC, VERR_INVALID_POINTER); return pReq->iStatusX; } RT_EXPORT_SYMBOL(RTReqGetStatus); /** * Process one request. * * @returns IPRT status code. * * @param pReq Request packet to process. */ DECLHIDDEN(int) rtReqProcessOne(PRTREQINT pReq) { LogFlow(("rtReqProcessOne: pReq=%p type=%d fFlags=%#x\n", pReq, pReq->enmType, pReq->fFlags)); /* * Process the request. */ Assert(pReq->enmState == RTREQSTATE_QUEUED); pReq->enmState = RTREQSTATE_PROCESSING; int rcRet = VINF_SUCCESS; /* the return code of this function. */ int rcReq = VERR_NOT_IMPLEMENTED; /* the request status. */ switch (pReq->enmType) { /* * A packed down call frame. */ case RTREQTYPE_INTERNAL: { uintptr_t *pauArgs = &pReq->u.Internal.aArgs[0]; union { PFNRT pfn; DECLCALLBACKMEMBER(int, pfn00)(void); DECLCALLBACKMEMBER(int, pfn01)(uintptr_t); DECLCALLBACKMEMBER(int, pfn02)(uintptr_t, uintptr_t); DECLCALLBACKMEMBER(int, pfn03)(uintptr_t, uintptr_t, uintptr_t); DECLCALLBACKMEMBER(int, pfn04)(uintptr_t, uintptr_t, uintptr_t, uintptr_t); DECLCALLBACKMEMBER(int, pfn05)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t); DECLCALLBACKMEMBER(int, pfn06)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t); DECLCALLBACKMEMBER(int, pfn07)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t); DECLCALLBACKMEMBER(int, pfn08)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t); DECLCALLBACKMEMBER(int, pfn09)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t); DECLCALLBACKMEMBER(int, pfn10)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t); DECLCALLBACKMEMBER(int, pfn11)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t); DECLCALLBACKMEMBER(int, pfn12)(uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t, uintptr_t); } u; u.pfn = pReq->u.Internal.pfn; #ifndef RT_ARCH_X86 switch (pReq->u.Internal.cArgs) { case 0: rcRet = u.pfn00(); break; case 1: rcRet = u.pfn01(pauArgs[0]); break; case 2: rcRet = u.pfn02(pauArgs[0], pauArgs[1]); break; case 3: rcRet = u.pfn03(pauArgs[0], pauArgs[1], pauArgs[2]); break; case 4: rcRet = u.pfn04(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3]); break; case 5: rcRet = u.pfn05(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4]); break; case 6: rcRet = u.pfn06(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5]); break; case 7: rcRet = u.pfn07(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6]); break; case 8: rcRet = u.pfn08(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7]); break; case 9: rcRet = u.pfn09(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8]); break; case 10: rcRet = u.pfn10(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8], pauArgs[9]); break; case 11: rcRet = u.pfn11(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8], pauArgs[9], pauArgs[10]); break; case 12: rcRet = u.pfn12(pauArgs[0], pauArgs[1], pauArgs[2], pauArgs[3], pauArgs[4], pauArgs[5], pauArgs[6], pauArgs[7], pauArgs[8], pauArgs[9], pauArgs[10], pauArgs[11]); break; default: AssertReleaseMsgFailed(("cArgs=%d\n", pReq->u.Internal.cArgs)); rcRet = rcReq = VERR_INTERNAL_ERROR; break; } #else /* RT_ARCH_X86 */ size_t cbArgs = pReq->u.Internal.cArgs * sizeof(uintptr_t); # ifdef __GNUC__ __asm__ __volatile__("movl %%esp, %%edx\n\t" "subl %2, %%esp\n\t" "andl $0xfffffff0, %%esp\n\t" "shrl $2, %2\n\t" "movl %%esp, %%edi\n\t" "rep movsl\n\t" "movl %%edx, %%edi\n\t" "call *%%eax\n\t" "mov %%edi, %%esp\n\t" : "=a" (rcRet), "=S" (pauArgs), "=c" (cbArgs) : "0" (u.pfn), "1" (pauArgs), "2" (cbArgs) : "edi", "edx"); # else __asm { xor edx, edx /* just mess it up. */ mov eax, u.pfn mov ecx, cbArgs shr ecx, 2 mov esi, pauArgs mov ebx, esp sub esp, cbArgs and esp, 0xfffffff0 mov edi, esp rep movsd call eax mov esp, ebx mov rcRet, eax } # endif #endif /* RT_ARCH_X86 */ if ((pReq->fFlags & (RTREQFLAGS_RETURN_MASK)) == RTREQFLAGS_VOID) rcRet = VINF_SUCCESS; rcReq = rcRet; break; } default: AssertMsgFailed(("pReq->enmType=%d\n", pReq->enmType)); rcReq = VERR_NOT_IMPLEMENTED; break; } /* * Complete the request and then release our request handle reference. */ pReq->iStatusX = rcReq; pReq->enmState = RTREQSTATE_COMPLETED; if (pReq->fFlags & RTREQFLAGS_NO_WAIT) LogFlow(("rtReqProcessOne: Completed request %p: rcReq=%Rrc rcRet=%Rrc (no wait)\n", pReq, rcReq, rcRet)); else { /* Notify the waiting thread. */ LogFlow(("rtReqProcessOne: Completed request %p: rcReq=%Rrc rcRet=%Rrc - notifying waiting thread\n", pReq, rcReq, rcRet)); ASMAtomicXchgSize(&pReq->fEventSemClear, false); int rc2 = RTSemEventSignal(pReq->EventSem); if (rc2 != VINF_SUCCESS) { AssertRC(rc2); rcRet = rc2; } } RTReqRelease(pReq); return rcRet; }