| 1 | /* $Id: PDMAllQueue.cpp 93609 2022-02-05 19:03:08Z vboxsync $ */
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| 2 | /** @file
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| 3 | * PDM Queue - Transport data and tasks to EMT and R3.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2022 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.alldomusa.eu.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 |
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| 19 | /*********************************************************************************************************************************
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| 20 | * Header Files *
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| 21 | *********************************************************************************************************************************/
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| 22 | #define LOG_GROUP LOG_GROUP_PDM_QUEUE
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| 23 | #include "PDMInternal.h"
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| 24 | #include <VBox/vmm/pdm.h>
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| 25 | #ifndef IN_RC
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| 26 | # include <VBox/vmm/mm.h>
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| 27 | #endif
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| 28 | #include <VBox/vmm/vmcc.h>
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| 29 | #include <iprt/errcore.h>
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| 30 | #include <VBox/log.h>
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| 31 | #include <iprt/asm.h>
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| 32 | #include <iprt/assert.h>
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| 33 | #include <iprt/string.h>
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| 34 |
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| 35 |
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| 36 | /*********************************************************************************************************************************
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| 37 | * Defined Constants And Macros *
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| 38 | *********************************************************************************************************************************/
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| 39 | /*
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| 40 | * Macros for thoroughly validating a queue handle and ownership.
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| 41 | */
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| 42 | #define PDMQUEUE_HANDLE_TO_VARS_RETURN_COMMON(a_cbMax, a_cbTotalMax) \
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| 43 | AssertReturn(cbItem >= sizeof(PDMQUEUEITEMCORE), pQueue->rcOkay = VERR_INTERNAL_ERROR_4); \
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| 44 | AssertReturn(cbItem <= (a_cbMax), pQueue->rcOkay = VERR_INTERNAL_ERROR_4); \
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| 45 | \
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| 46 | /* paranoia^3: */ \
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| 47 | AssertReturn(cItems > 0, pQueue->rcOkay = VERR_INTERNAL_ERROR_4); \
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| 48 | AssertReturn(cItems <= PDMQUEUE_MAX_ITEMS, pQueue->rcOkay = VERR_INTERNAL_ERROR_4); \
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| 49 | AssertReturn(cbItem * cItems <= (a_cbTotalMax), pQueue->rcOkay = VERR_INTERNAL_ERROR_4)
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| 50 |
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| 51 | #ifdef IN_RING0
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| 52 | # define PDMQUEUE_HANDLE_TO_VARS_RETURN(a_pVM, a_hQueue, a_pvOwner) \
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| 53 | AssertPtrReturn((a_pvOwner), VERR_INVALID_PARAMETER); \
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| 54 | \
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| 55 | AssertCompile(RT_ELEMENTS((a_pVM)->pdm.s.apRing0Queues) == RT_ELEMENTS((a_pVM)->pdmr0.s.aQueues)); \
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| 56 | AssertReturn((a_hQueue) < RT_ELEMENTS((a_pVM)->pdmr0.s.aQueues), VERR_INVALID_HANDLE); \
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| 57 | AssertReturn((a_hQueue) < (a_pVM)->pdmr0.s.cQueues, VERR_INVALID_HANDLE); \
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| 58 | AssertReturn((a_pVM)->pdmr0.s.aQueues[(a_hQueue)].pvOwner == (a_pvOwner), VERR_INVALID_HANDLE); \
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| 59 | PPDMQUEUE pQueue = (a_pVM)->pdmr0.s.aQueues[(a_hQueue)].pQueue; \
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| 60 | AssertPtrReturn(pQueue, VERR_INVALID_HANDLE); \
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| 61 | AssertReturn(pQueue->u32Magic == PDMQUEUE_MAGIC, VERR_INVALID_HANDLE); \
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| 62 | AssertReturn(pQueue->rcOkay == VINF_SUCCESS, pQueue->rcOkay); \
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| 63 | \
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| 64 | uint32_t const cbItem = (a_pVM)->pdmr0.s.aQueues[(a_hQueue)].cbItem; \
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| 65 | uint32_t const cItems = (a_pVM)->pdmr0.s.aQueues[(a_hQueue)].cItems; \
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| 66 | uint32_t const offItems = (a_pVM)->pdmr0.s.aQueues[(a_hQueue)].offItems; \
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| 67 | \
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| 68 | /* paranoia^2: */ \
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| 69 | AssertReturn(pQueue->cbItem == cbItem, pQueue->rcOkay = VERR_INTERNAL_ERROR_3); \
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| 70 | AssertReturn(pQueue->cItems == cItems, pQueue->rcOkay = VERR_INTERNAL_ERROR_3); \
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| 71 | AssertReturn(pQueue->offItems == offItems, pQueue->rcOkay = VERR_INTERNAL_ERROR_3); \
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| 72 | \
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| 73 | PDMQUEUE_HANDLE_TO_VARS_RETURN_COMMON(PDMQUEUE_MAX_ITEM_SIZE, PDMQUEUE_MAX_TOTAL_SIZE_R0)
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| 74 |
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| 75 | #else
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| 76 | # define PDMQUEUE_HANDLE_TO_VARS_RETURN(a_pVM, a_hQueue, a_pvOwner) \
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| 77 | AssertPtrReturn((a_pvOwner), VERR_INVALID_PARAMETER); \
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| 78 | \
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| 79 | PPDMQUEUE pQueue; \
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| 80 | if ((a_hQueue) < RT_ELEMENTS((a_pVM)->pdm.s.apRing0Queues)) \
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| 81 | pQueue = (a_pVM)->pdm.s.apRing0Queues[(a_hQueue)]; \
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| 82 | else \
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| 83 | { \
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| 84 | (a_hQueue) -= RT_ELEMENTS((a_pVM)->pdm.s.apRing0Queues); \
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| 85 | AssertReturn((a_pVM)->pdm.s.cRing3Queues, VERR_INVALID_HANDLE); \
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| 86 | pQueue = (a_pVM)->pdm.s.papRing3Queues[(a_hQueue)]; \
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| 87 | } \
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| 88 | AssertPtrReturn(pQueue, VERR_INVALID_HANDLE); \
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| 89 | AssertReturn(pQueue->u32Magic == PDMQUEUE_MAGIC, VERR_INVALID_HANDLE); \
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| 90 | AssertReturn(pQueue->u.Gen.pvOwner == (a_pvOwner), VERR_INVALID_HANDLE); \
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| 91 | AssertReturn(pQueue->rcOkay == VINF_SUCCESS, pQueue->rcOkay); \
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| 92 | \
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| 93 | uint32_t const cbItem = pQueue->cbItem; \
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| 94 | uint32_t const cItems = pQueue->cItems; \
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| 95 | uint32_t const offItems = pQueue->offItems; \
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| 96 | \
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| 97 | PDMQUEUE_HANDLE_TO_VARS_RETURN_COMMON(PDMQUEUE_MAX_ITEM_SIZE, PDMQUEUE_MAX_TOTAL_SIZE_R3)
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| 98 |
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| 99 | #endif
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| 100 |
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| 101 |
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| 102 | /**
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| 103 | * Commmon function for initializing the shared queue structure.
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| 104 | */
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| 105 | void pdmQueueInit(PPDMQUEUE pQueue, uint32_t cbBitmap, uint32_t cbItem, uint32_t cItems,
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| 106 | const char *pszName, PDMQUEUETYPE enmType, RTR3PTR pfnCallback, RTR3PTR pvOwner)
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| 107 | {
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| 108 | Assert(cbBitmap * 8 >= cItems);
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| 109 |
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| 110 | pQueue->u32Magic = PDMQUEUE_MAGIC;
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| 111 | pQueue->cbItem = cbItem;
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| 112 | pQueue->cItems = cItems;
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| 113 | pQueue->offItems = RT_UOFFSETOF(PDMQUEUE, bmAlloc) + cbBitmap;
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| 114 | pQueue->rcOkay = VINF_SUCCESS;
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| 115 | pQueue->u32Padding = 0;
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| 116 | pQueue->hTimer = NIL_TMTIMERHANDLE;
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| 117 | pQueue->cMilliesInterval = 0;
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| 118 | pQueue->enmType = enmType;
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| 119 | pQueue->u.Gen.pfnCallback = pfnCallback;
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| 120 | pQueue->u.Gen.pvOwner = pvOwner;
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| 121 | RTStrCopy(pQueue->szName, sizeof(pQueue->szName), pszName);
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| 122 | pQueue->iPending = UINT32_MAX;
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| 123 | RT_BZERO(pQueue->bmAlloc, cbBitmap);
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| 124 | ASMBitSetRange(pQueue->bmAlloc, 0, cItems);
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| 125 |
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| 126 | uint8_t *pbItem = (uint8_t *)&pQueue->bmAlloc[0] + cbBitmap;
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| 127 | while (cItems-- > 0)
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| 128 | {
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| 129 | ((PPDMQUEUEITEMCORE)pbItem)->u64View = UINT64_C(0xfeedfeedfeedfeed);
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| 130 |
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| 131 | /* next */
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| 132 | pbItem += cbItem;
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| 133 | }
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| 134 | }
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| 135 |
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| 136 |
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| 137 | /**
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| 138 | * Allocate an item from a queue, extended version.
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| 139 | *
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| 140 | * The allocated item must be handed on to PDMR3QueueInsert() after the
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| 141 | * data have been filled in.
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| 142 | *
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| 143 | * @returns VBox status code.
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| 144 | * @param pVM Pointer to the cross context VM structure w/ ring-0.
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| 145 | * @param hQueue The queue handle.
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| 146 | * @param pvOwner The queue owner.
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| 147 | * @param ppNew Where to return the item pointer on success.
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| 148 | * @thread Any thread.
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| 149 | */
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| 150 | VMMDECL(int) PDMQueueAllocEx(PVMCC pVM, PDMQUEUEHANDLE hQueue, void *pvOwner, PPDMQUEUEITEMCORE *ppNew)
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| 151 | {
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| 152 | /*
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| 153 | * Validate and translate input.
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| 154 | */
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| 155 | *ppNew = NULL;
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| 156 | PDMQUEUE_HANDLE_TO_VARS_RETURN(pVM, hQueue, pvOwner);
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| 157 |
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| 158 | /*
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| 159 | * Do the allocation.
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| 160 | */
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| 161 | uint32_t cEmptyScans = 0;
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| 162 | for (;;)
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| 163 | {
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| 164 | int32_t iBit = ASMBitFirstSet(pQueue->bmAlloc, cItems);
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| 165 | if (iBit >= 0)
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| 166 | {
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| 167 | if (ASMAtomicBitTestAndClear(pQueue->bmAlloc, iBit))
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| 168 | {
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| 169 | PPDMQUEUEITEMCORE pNew = (PPDMQUEUEITEMCORE)&((uint8_t *)pQueue)[offItems + iBit * cbItem];
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| 170 | pNew->u64View = UINT64_C(0xbeefbeefbeefbeef);
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| 171 | *ppNew = pNew;
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| 172 | return VINF_SUCCESS;
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| 173 | }
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| 174 | cEmptyScans = 0;
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| 175 | }
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| 176 | else if (++cEmptyScans < 16)
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| 177 | ASMNopPause();
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| 178 | else
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| 179 | {
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| 180 | STAM_REL_COUNTER_INC(&pQueue->StatAllocFailures);
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| 181 | return VERR_OUT_OF_RESOURCES;
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| 182 | }
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| 183 | }
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| 184 | }
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| 185 |
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| 186 |
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| 187 | /**
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| 188 | * Allocate an item from a queue.
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| 189 | *
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| 190 | * The allocated item must be handed on to PDMR3QueueInsert() after the
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| 191 | * data have been filled in.
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| 192 | *
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| 193 | * @returns VBox status code.
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| 194 | * @param pVM Pointer to the cross context VM structure w/ ring-0.
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| 195 | * @param hQueue The queue handle.
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| 196 | * @param pvOwner The queue owner.
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| 197 | * @param ppNew Where to return the item pointer on success.
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| 198 | * @thread Any thread.
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| 199 | */
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| 200 | VMMDECL(PPDMQUEUEITEMCORE) PDMQueueAlloc(PVMCC pVM, PDMQUEUEHANDLE hQueue, void *pvOwner)
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| 201 | {
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| 202 | PPDMQUEUEITEMCORE pNew = NULL;
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| 203 | int rc = PDMQueueAllocEx(pVM, hQueue, pvOwner, &pNew);
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| 204 | if (RT_SUCCESS(rc))
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| 205 | return pNew;
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| 206 | return NULL;
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| 207 | }
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| 208 |
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| 209 |
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| 210 | /**
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| 211 | * Sets the FFs and fQueueFlushed.
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| 212 | *
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| 213 | * @param pVM Pointer to the cross context VM structure w/ ring-0.
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| 214 | */
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| 215 | static void pdmQueueSetFF(PVMCC pVM)
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| 216 | {
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| 217 | Log2(("PDMQueueInsert: VM_FF_PDM_QUEUES %d -> 1\n", VM_FF_IS_SET(pVM, VM_FF_PDM_QUEUES)));
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| 218 | VM_FF_SET(pVM, VM_FF_PDM_QUEUES);
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| 219 | ASMAtomicBitSet(&pVM->pdm.s.fQueueFlushing, PDM_QUEUE_FLUSH_FLAG_PENDING_BIT);
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| 220 | #ifdef IN_RING3
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| 221 | VMR3NotifyGlobalFFU(pVM->pUVM, VMNOTIFYFF_FLAGS_DONE_REM);
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| 222 | #endif
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| 223 | }
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| 224 |
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| 225 |
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| 226 | /**
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| 227 | * Queue an item.
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| 228 | *
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| 229 | * The item must have been obtained using PDMQueueAlloc(). Once the item
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| 230 | * have been passed to this function it must not be touched!
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| 231 | *
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| 232 | * @returns VBox status code.
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| 233 | * @param pVM Pointer to the cross context VM structure w/ ring-0.
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| 234 | * @param hQueue The queue handle.
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| 235 | * @param pvOwner The queue owner.
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| 236 | * @param pInsert The item to insert.
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| 237 | * @thread Any thread.
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| 238 | */
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| 239 | VMMDECL(int) PDMQueueInsert(PVMCC pVM, PDMQUEUEHANDLE hQueue, void *pvOwner, PPDMQUEUEITEMCORE pInsert)
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| 240 | {
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| 241 | /*
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| 242 | * Validate and translate input.
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| 243 | */
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| 244 | PDMQUEUE_HANDLE_TO_VARS_RETURN(pVM, hQueue, pvOwner);
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| 245 |
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| 246 | uint8_t * const pbItems = (uint8_t *)pQueue + offItems;
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| 247 | uintptr_t const offInsert = (uintptr_t)pInsert - (uintptr_t)pbItems;
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| 248 | uintptr_t const iInsert = offInsert / cbItem;
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| 249 | AssertReturn(iInsert < cItems, VERR_INVALID_PARAMETER);
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| 250 | AssertReturn(iInsert * cbItem == offInsert, VERR_INVALID_PARAMETER);
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| 251 |
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| 252 | AssertReturn(ASMBitTest(pQueue->bmAlloc, iInsert) == false, VERR_INVALID_PARAMETER);
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| 253 |
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| 254 | /*
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| 255 | * Append the item to the pending list.
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| 256 | */
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| 257 | for (;;)
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| 258 | {
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| 259 | uint32_t const iOldPending = ASMAtomicUoReadU32(&pQueue->iPending);
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| 260 | pInsert->iNext = iOldPending;
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| 261 | if (ASMAtomicCmpXchgU32(&pQueue->iPending, iInsert, iOldPending))
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| 262 | break;
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| 263 | ASMNopPause();
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| 264 | }
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| 265 |
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| 266 | if (pQueue->hTimer == NIL_TMTIMERHANDLE)
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| 267 | pdmQueueSetFF(pVM);
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| 268 | STAM_REL_COUNTER_INC(&pQueue->StatInsert);
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| 269 | STAM_STATS({ ASMAtomicIncU32(&pQueue->cStatPending); });
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| 270 |
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| 271 | return VINF_SUCCESS;
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| 272 | }
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| 273 |
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| 274 |
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| 275 | /**
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| 276 | * Schedule the queue for flushing (processing) if necessary.
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| 277 | *
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| 278 | * @returns VBox status code.
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| 279 | * @retval VINF_SUCCESS if a flush was necessary.
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| 280 | * @retval VINF_NO_CHANGE if no flushing needed.
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| 281 | *
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| 282 | * @param pVM The cross context VM structure.
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| 283 | * @param pvOwner The alleged queue owner.
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| 284 | * @param hQueue The queueu to maybe flush.
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| 285 | */
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| 286 | VMMDECL(int) PDMQueueFlushIfNecessary(PVMCC pVM, PDMQUEUEHANDLE hQueue, void *pvOwner)
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| 287 | {
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| 288 | /*
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| 289 | * Validate input.
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| 290 | */
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| 291 | PDMQUEUE_HANDLE_TO_VARS_RETURN(pVM, hQueue, pvOwner);
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| 292 | RT_NOREF(offItems);
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| 293 |
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| 294 | /*
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| 295 | * Check and maybe flush.
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| 296 | */
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| 297 | if (ASMAtomicUoReadU32(&pQueue->iPending) != UINT32_MAX)
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| 298 | {
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| 299 | pdmQueueSetFF(pVM);
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| 300 | return VINF_SUCCESS;
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| 301 | }
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| 302 | return VINF_NO_CHANGE;
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| 303 | }
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| 304 |
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