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The source code is licensed under MS-PL license, taken from Windows Driver Samples repository (https://github.com/microsoft/Windows-driver-samples/tree/master/storage/class/classpnp/) Synched with commit 88541f70c4273ecd30c8c7c72135bc038a00fd88 The driver is written for Windows 8+, so we compile it with ntoskrnl_vista statically linked and with NTDDI_WIN8 defined CORE-17129
147 lines
4.2 KiB
C
147 lines
4.2 KiB
C
/*++
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Copyright (C) Microsoft Corporation, 1991 - 1999
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Module Name:
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history.c
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Abstract:
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Packet history routines for CLASSPNP
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Environment:
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kernel mode only
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Notes:
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Revision History:
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--*/
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#include "classp.h"
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#include "debug.h"
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#ifdef DEBUG_USE_WPP
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#include "history.tmh"
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#endif
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//#ifdef ALLOC_PRAGMA
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// #pragma alloc_text(PAGE, InitializeTransferPackets)
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//#endif
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VOID HistoryInitializeRetryLogs(_Out_ PSRB_HISTORY History, ULONG HistoryCount) {
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ULONG tmpSize = HistoryCount * sizeof(SRB_HISTORY_ITEM);
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tmpSize += sizeof(SRB_HISTORY) - sizeof(SRB_HISTORY_ITEM);
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RtlZeroMemory(History, tmpSize);
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History->TotalHistoryCount = HistoryCount;
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return;
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}
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VOID HistoryLogSendPacket(TRANSFER_PACKET * Pkt) {
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PSRB_HISTORY history;
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PSRB_HISTORY_ITEM item;
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NT_ASSERT( Pkt->RetryHistory != NULL );
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history = Pkt->RetryHistory;
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// sending a packet implies a new history unit is to be used.
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NT_ASSERT( history->UsedHistoryCount <= history->TotalHistoryCount );
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// if already all used up, request class driver to remove at least one history unit
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if (history->UsedHistoryCount == history->TotalHistoryCount )
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{
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PFUNCTIONAL_DEVICE_EXTENSION fdoExtension = Pkt->Fdo->DeviceExtension;
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PCLASS_PRIVATE_FDO_DATA fdoData = fdoExtension->PrivateFdoData;
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NT_ASSERT( fdoData->InterpretSenseInfo != NULL );
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NT_ASSERT( fdoData->InterpretSenseInfo->Compress != NULL );
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fdoData->InterpretSenseInfo->Compress( fdoExtension->DeviceObject, history );
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NT_ASSERT( history->UsedHistoryCount < history->TotalHistoryCount );
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}
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// thus, since we are about to increment the count, it must now be less...
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NT_ASSERT( history->UsedHistoryCount < history->TotalHistoryCount );
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// increment the number of history units in use
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history->UsedHistoryCount++;
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// determine index to use
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item = &( history->History[ history->UsedHistoryCount-1 ] );
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// zero out the history item
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RtlZeroMemory(item, sizeof(SRB_HISTORY_ITEM));
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// Query the tick count and store in the history
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KeQueryTickCount(&item->TickCountSent);
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return;
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}
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VOID HistoryLogReturnedPacket(TRANSFER_PACKET *Pkt) {
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PSRB_HISTORY history;
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PSRB_HISTORY_ITEM item;
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UCHAR senseSize;
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PVOID senseInfoBuffer;
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UCHAR senseInfoBufferLength;
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SENSE_DATA convertedSenseBuffer = {0};
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BOOLEAN validSense = TRUE;
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NT_ASSERT( Pkt->RetryHistory != NULL );
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history = Pkt->RetryHistory;
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NT_ASSERT( history->UsedHistoryCount <= history->TotalHistoryCount );
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item = &( history->History[ history->UsedHistoryCount-1 ] );
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// Query the tick count and store in the history
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KeQueryTickCount(&item->TickCountCompleted);
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// Copy the SRB Status...
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item->SrbStatus = Pkt->Srb->SrbStatus;
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//
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// Process sense data
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//
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senseInfoBuffer = ClasspTransferPacketGetSenseInfoBuffer(Pkt);
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senseInfoBufferLength = ClasspTransferPacketGetSenseInfoBufferLength(Pkt);
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if (IsDescriptorSenseDataFormat(senseInfoBuffer)) {
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validSense = ScsiConvertToFixedSenseFormat(senseInfoBuffer,
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senseInfoBufferLength,
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(PVOID)&convertedSenseBuffer,
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sizeof(convertedSenseBuffer));
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if (validSense) {
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senseInfoBuffer = (PVOID)&convertedSenseBuffer;
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senseInfoBufferLength = sizeof(convertedSenseBuffer);
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}
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}
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RtlZeroMemory(&(item->NormalizedSenseData), sizeof(item->NormalizedSenseData));
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if (validSense) {
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// Determine the amount of valid sense data
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if (!ScsiGetTotalSenseByteCountIndicated(senseInfoBuffer,
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senseInfoBufferLength,
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&senseSize)) {
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senseSize = senseInfoBufferLength;
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}
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// Normalize the sense data copy in the history
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senseSize = min(senseSize, sizeof(item->NormalizedSenseData));
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RtlCopyMemory(&(item->NormalizedSenseData),
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senseInfoBuffer,
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senseSize
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);
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}
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return;
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}
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