public void AllocatePlaneToWriteTransaction(InternalWriteRequest internalReq)
{
if (myFTL.AddressMapper.AddressMappingDomains[internalReq.RelatedIORequest.StreamID].MappingTable.State[internalReq.LPN] != 0)
{
if ((internalReq.State & myFTL.AddressMapper.AddressMappingDomains[internalReq.RelatedIORequest.StreamID].MappingTable.State[internalReq.LPN])
!= myFTL.AddressMapper.AddressMappingDomains[internalReq.RelatedIORequest.StreamID].MappingTable.State[internalReq.LPN])
{
myFTL.TotalPageReads++;
myFTL.PageReadsForWorkload++;
myFTL.PageReadsForUpdate++;
InternalReadRequest update = new InternalReadRequest();
myFTL.AddressMapper.ConvertPPNToPageAddress(myFTL.AddressMapper.AddressMappingDomains[internalReq.RelatedIORequest.StreamID].MappingTable.PPN[internalReq.LPN], update.TargetPageAddress);
update.TargetFlashChip = myFTL.FlashChips[update.TargetPageAddress.OverallFlashChipID];
update.LPN = internalReq.LPN;
update.PPN = myFTL.AddressMapper.AddressMappingDomains[internalReq.RelatedIORequest.StreamID].MappingTable.PPN[internalReq.LPN];
update.State = ((myFTL.AddressMapper.AddressMappingDomains[internalReq.RelatedIORequest.StreamID].MappingTable.State[internalReq.LPN] ^ internalReq.State) & 0x7fffffff);
update.SizeInSubpages = FTL.SizeInSubpages(update.State);
update.SizeInByte = update.SizeInSubpages * FTL.SubPageCapacity;
update.BodyTransferCycles = update.SizeInByte / FTL.ChannelWidthInByte;
update.Type = InternalRequestType.Read;
update.IsUpdate = true;
update.RelatedWrite = internalReq;
update.RelatedIORequest = internalReq.RelatedIORequest;
internalReq.UpdateRead = update;
internalReq.State = (internalReq.State | update.State);
internalReq.SizeInSubpages = FTL.SizeInSubpages(internalReq.State);
}
}
myFTL.AddressMapper.AllocatePlaneForWrite(internalReq.RelatedIORequest.StreamID, internalReq);
}
private void createFlashOperationRequest(ulong lpn, uint sizeInSubpages, uint state, IORequest currentIORequest)
{
if (currentIORequest.Type == IORequestType.Read)
{
InternalReadRequest subRequest = new InternalReadRequest();
myFTL.TotalPageReads++;
myFTL.PageReadsForWorkload++;
if (myFTL.AddressMapper.AddressMappingDomains[currentIORequest.StreamID].MappingTable.State[lpn] == 0)
{
for (var LPN = myFTL.currentActiveWriteLPNs[currentIORequest.StreamID].First; LPN != null; LPN = LPN.Next)
{
if (LPN.Value == lpn)
{
return;
}
}
throw new Exception("Accessing an unwritten logical address for read!");
}
myFTL.AddressMapper.ConvertPPNToPageAddress(myFTL.AddressMapper.AddressMappingDomains[currentIORequest.StreamID].MappingTable.PPN[lpn], subRequest.TargetPageAddress);
subRequest.TargetFlashChip = myFTL.FlashChips[subRequest.TargetPageAddress.OverallFlashChipID];
subRequest.LPN = lpn;
subRequest.PPN = myFTL.AddressMapper.AddressMappingDomains[currentIORequest.StreamID].MappingTable.PPN[lpn];
subRequest.SizeInSubpages = sizeInSubpages;
subRequest.SizeInByte = sizeInSubpages * FTL.SubPageCapacity;
subRequest.BodyTransferCycles = subRequest.SizeInByte / FTL.ChannelWidthInByte;
subRequest.State = (myFTL.AddressMapper.AddressMappingDomains[currentIORequest.StreamID].MappingTable.State[lpn] & 0x7fffffff);
subRequest.Type = InternalRequestType.Read;
subRequest.RelatedIORequest = currentIORequest;
//Arash: I have omitted a section of original code to ignore simultaneous read of same memory location
currentIORequest.InternalRequestList.AddLast(subRequest);
}
else //currentRequest.Type == IORequestType.Write
{
InternalWriteRequest subRequest = new InternalWriteRequest();
myFTL.currentActiveWriteLPNs[currentIORequest.StreamID].AddLast(lpn);
myFTL.TotalPageProgams++;
myFTL.PageProgramsForWorkload++;
subRequest.LPN = lpn;
subRequest.PPN = 0;
subRequest.SizeInSubpages = sizeInSubpages;
subRequest.SizeInByte = sizeInSubpages * FTL.SubPageCapacity;
subRequest.BodyTransferCycles = subRequest.SizeInByte / FTL.ChannelWidthInByte;
subRequest.State = state;
subRequest.Type = InternalRequestType.Write;
subRequest.RelatedIORequest = currentIORequest;
//The above line should be positioned before AllocateLocation.
AllocatePlaneToWriteTransaction(subRequest);
currentIORequest.InternalRequestList.AddLast(subRequest);
}
}
/// <summary> /// Provides communication between controller and flash chip for a multiplane or interleaved read command execution. /// </summary> /// <param name="internalReqList">The list of internal requests that are executed in multiplane or interleaved mode.</param> public abstract void SendAdvCommandToChipRD(InternalReadRequest firstInternalReq, InternalReadRequest secondInternalReq);