ufs_device.cc

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/*
 * Copyright (c) 2013-2015 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


 
#include "dev/arm/ufs_device.hh"
 
namespace gem5
{

UFSHostDevice::UFSSCSIDevice::UFSSCSIDevice(const UFSHostDeviceParams &p,
                             uint32_t lun_id, const Callback &transfer_cb,
                             const Callback &read_cb):
    SimObject(p),
    flashDisk(p.image[lun_id]),
    flashDevice(p.internalflash[lun_id]),
    blkSize(p.img_blk_size),
    lunAvail(p.image.size()),
    diskSize(flashDisk->size()),
    capacityLower((diskSize - 1) & 0xffffffff),
    capacityUpper((diskSize - SectorSize) >> 32),
    lunID(lun_id),
    transferCompleted(false),
    readCompleted(false),
    totalRead(0),
    totalWrite(0),
    amountOfWriteTransfers(0),
    amountOfReadTransfers(0)
{
    signalDone = transfer_cb;
    memReadCallback = [this]() { readCallback(); };
    deviceReadCallback = read_cb;
    memWriteCallback = [this]() { SSDWriteDone(); };

    uint32_t temp_id = ((lun_id | 0x30) << 24) | 0x3A4449;
    lunInfo.dWord0 = 0x02060000;   //data
    lunInfo.dWord1 = 0x0200001F;
    lunInfo.vendor0 = 0x484D5241;  //ARMH (HMRA)
    lunInfo.vendor1 = 0x424D4143;  //CAMB (BMAC)
    lunInfo.product0 = 0x356D6567; //gem5  (5meg)
    lunInfo.product1 = 0x4D534655; //UFSM (MSFU)
    lunInfo.product2 = 0x4C45444F; //ODEL (LEDO)
    lunInfo.product3 = temp_id;    // ID:"lun_id" ("lun_id":DI)
    lunInfo.productRevision = 0x01000000; //0x01
 
    DPRINTF(UFSHostDevice, "Logic unit %d assumes that %d logic units are"
            " present in the system\n", lunID, lunAvail);
    DPRINTF(UFSHostDevice,"The disksize of lun: %d should be %d blocks\n",
            lunID, diskSize);
    flashDevice->initializeMemory(diskSize, SectorSize);
}
 

const unsigned int UFSHostDevice::UFSSCSIDevice::controlPage[3] =
                                                {0x01400A0A, 0x00000000,
                                                 0x0000FFFF};
const unsigned int UFSHostDevice::UFSSCSIDevice::recoveryPage[3] =
                                                {0x03800A01, 0x00000000,
                                                 0xFFFF0003};
const unsigned int UFSHostDevice::UFSSCSIDevice::cachingPage[5] =
                                                {0x00011208, 0x00000000,
                                                 0x00000000, 0x00000020,
                                                 0x00000000};
 
UFSHostDevice::UFSSCSIDevice::~UFSSCSIDevice() {}

 
struct UFSHostDevice::SCSIReply
UFSHostDevice::UFSSCSIDevice::SCSICMDHandle(uint32_t* SCSI_msg)
{
    struct SCSIReply scsi_out;
    scsi_out.reset();

    scsi_out.message.header.dWord0 = UPIUHeaderDataIndWord0 |
        lunID << 16;
    scsi_out.message.header.dWord1 = UPIUHeaderDataIndWord1;
    scsi_out.message.header.dWord2 = UPIUHeaderDataIndWord2;
    statusCheck(SCSIGood, scsi_out.senseCode);
    scsi_out.senseSize = scsi_out.senseCode[0];
    scsi_out.LUN = lunID;
    scsi_out.status = SCSIGood;
 
    DPRINTF(UFSHostDevice, "SCSI command:%2x\n", SCSI_msg[4]);
 
    switch (SCSI_msg[4] & 0xFF) {
 
      case SCSIInquiry: {
          scsi_out.msgSize = 36;
          scsi_out.message.dataMsg.resize(9);
 
          for (uint8_t count = 0; count < 9; count++)
              scsi_out.message.dataMsg[count] =
                  (reinterpret_cast<uint32_t*> (&lunInfo))[count];
      } break;
 
      case SCSIRead6: {
          scsi_out.expectMore = 0x02;
          scsi_out.msgSize = 0;
 
          uint8_t* tempptr = reinterpret_cast<uint8_t*>(&SCSI_msg[4]);

          uint32_t tmp = *reinterpret_cast<uint32_t*>(tempptr);
          uint64_t read_offset = betoh(tmp) & 0x1FFFFF;
 
          uint32_t read_size = tempptr[4];
 
 
          scsi_out.msgSize =  read_size * blkSize;
          scsi_out.offset = read_offset * blkSize;
 
          if ((read_offset + read_size) > diskSize)
              scsi_out.status = SCSIIllegalRequest;
 
          DPRINTF(UFSHostDevice, "Read6 offset: 0x%8x, for %d blocks\n",
                  read_offset, read_size);

          statusCheck(scsi_out.status, scsi_out.senseCode);
          scsi_out.senseSize = scsi_out.senseCode[0];
          scsi_out.status = (scsi_out.status == SCSIGood) ? SCSIGood :
              SCSICheckCondition;
 
      } break;
 
      case SCSIRead10: {
          scsi_out.expectMore = 0x02;
          scsi_out.msgSize = 0;
 
          uint8_t* tempptr = reinterpret_cast<uint8_t*>(&SCSI_msg[4]);

          uint32_t tmp = *reinterpret_cast<uint32_t*>(&tempptr[2]);
          uint64_t read_offset = betoh(tmp);
 
          uint16_t tmpsize = *reinterpret_cast<uint16_t*>(&tempptr[7]);
          uint32_t read_size = betoh(tmpsize);
 
          scsi_out.msgSize =  read_size * blkSize;
          scsi_out.offset = read_offset * blkSize;
 
          if ((read_offset + read_size) > diskSize)
              scsi_out.status = SCSIIllegalRequest;
 
          DPRINTF(UFSHostDevice, "Read10 offset: 0x%8x, for %d blocks\n",
                  read_offset, read_size);

          statusCheck(scsi_out.status, scsi_out.senseCode);
          scsi_out.senseSize = scsi_out.senseCode[0];
          scsi_out.status = (scsi_out.status == SCSIGood) ? SCSIGood :
              SCSICheckCondition;
 
      } break;
 
      case SCSIRead16: {
          scsi_out.expectMore = 0x02;
          scsi_out.msgSize = 0;
 
          uint8_t* tempptr = reinterpret_cast<uint8_t*>(&SCSI_msg[4]);

          uint32_t tmp = *reinterpret_cast<uint32_t*>(&tempptr[2]);
          uint64_t read_offset = betoh(tmp);
 
          tmp = *reinterpret_cast<uint32_t*>(&tempptr[6]);
          read_offset = (read_offset << 32) | betoh(tmp);
 
          tmp = *reinterpret_cast<uint32_t*>(&tempptr[10]);
          uint32_t read_size = betoh(tmp);
 
          scsi_out.msgSize =  read_size * blkSize;
          scsi_out.offset = read_offset * blkSize;
 
          if ((read_offset + read_size) > diskSize)
              scsi_out.status = SCSIIllegalRequest;
 
          DPRINTF(UFSHostDevice, "Read16 offset: 0x%8x, for %d blocks\n",
                  read_offset, read_size);

          statusCheck(scsi_out.status, scsi_out.senseCode);
          scsi_out.senseSize = scsi_out.senseCode[0];
          scsi_out.status = (scsi_out.status == SCSIGood) ? SCSIGood :
              SCSICheckCondition;
 
      } break;
 
      case SCSIReadCapacity10: {
          scsi_out.msgSize = 8;
          scsi_out.message.dataMsg.resize(2);
          scsi_out.message.dataMsg[0] =
              betoh(capacityLower);//last block
          scsi_out.message.dataMsg[1] = betoh(blkSize);//blocksize
 
      } break;
      case SCSIReadCapacity16: {
          scsi_out.msgSize = 32;
          scsi_out.message.dataMsg.resize(8);
          scsi_out.message.dataMsg[0] =
              betoh(capacityUpper);//last block
          scsi_out.message.dataMsg[1] =
              betoh(capacityLower);//last block
          scsi_out.message.dataMsg[2] = betoh(blkSize);//blocksize
          scsi_out.message.dataMsg[3] = 0x00;//
          scsi_out.message.dataMsg[4] = 0x00;//reserved
          scsi_out.message.dataMsg[5] = 0x00;//reserved
          scsi_out.message.dataMsg[6] = 0x00;//reserved
          scsi_out.message.dataMsg[7] = 0x00;//reserved
 
      } break;
 
      case SCSIReportLUNs: {
          scsi_out.msgSize = (lunAvail * 8) + 8;//list + overhead
          scsi_out.message.dataMsg.resize(2 * lunAvail + 2);
          scsi_out.message.dataMsg[0] = (lunAvail * 8) << 24;//LUN listlength
          scsi_out.message.dataMsg[1] = 0x00;
 
          for (uint8_t count = 0; count < lunAvail; count++) {
              //LUN "count"
              scsi_out.message.dataMsg[2 + 2 * count] = (count & 0x7F) << 8;
              scsi_out.message.dataMsg[3 + 2 * count] = 0x00;
          }
 
      } break;
 
      case SCSIStartStop: {
          //Just acknowledge; not deemed relevant ATM
          scsi_out.msgSize = 0;
 
      } break;
 
      case SCSITestUnitReady: {
          //Just acknowledge; not deemed relevant ATM
          scsi_out.msgSize = 0;
 
      } break;
 
      case SCSIVerify10: {
          scsi_out.msgSize = 0;
 
          uint8_t* tempptr = reinterpret_cast<uint8_t*>(&SCSI_msg[4]);

          uint32_t tmp = *reinterpret_cast<uint32_t*>(&tempptr[2]);
          uint64_t read_offset = betoh(tmp);
 
          uint16_t tmpsize = *reinterpret_cast<uint16_t*>(&tempptr[7]);
          uint32_t read_size = betoh(tmpsize);
 
          if ((read_offset + read_size) > diskSize)
              scsi_out.status = SCSIIllegalRequest;

          statusCheck(scsi_out.status, scsi_out.senseCode);
          scsi_out.senseSize = scsi_out.senseCode[0];
          scsi_out.status = (scsi_out.status == SCSIGood) ? SCSIGood :
              SCSICheckCondition;
 
      } break;
 
      case SCSIWrite6: {
 
          uint8_t* tempptr = reinterpret_cast<uint8_t*>(&SCSI_msg[4]);

          uint32_t tmp = *reinterpret_cast<uint32_t*>(tempptr);
          uint64_t write_offset = betoh(tmp) & 0x1FFFFF;
 
          uint32_t write_size = tempptr[4];
 
          scsi_out.msgSize =  write_size * blkSize;
          scsi_out.offset = write_offset * blkSize;
          scsi_out.expectMore = 0x01;
 
          if ((write_offset + write_size) > diskSize)
              scsi_out.status = SCSIIllegalRequest;
 
          DPRINTF(UFSHostDevice, "Write6 offset: 0x%8x, for %d blocks\n",
                  write_offset, write_size);

          statusCheck(scsi_out.status, scsi_out.senseCode);
          scsi_out.senseSize = scsi_out.senseCode[0];
          scsi_out.status = (scsi_out.status == SCSIGood) ? SCSIGood :
              SCSICheckCondition;
 
      } break;
 
      case SCSIWrite10: {
          uint8_t* tempptr = reinterpret_cast<uint8_t*>(&SCSI_msg[4]);

          uint32_t tmp = *reinterpret_cast<uint32_t*>(&tempptr[2]);
          uint64_t write_offset = betoh(tmp);
 
          uint16_t tmpsize = *reinterpret_cast<uint16_t*>(&tempptr[7]);
          uint32_t write_size = betoh(tmpsize);
 
          scsi_out.msgSize =  write_size * blkSize;
          scsi_out.offset = write_offset * blkSize;
          scsi_out.expectMore = 0x01;
 
          if ((write_offset + write_size) > diskSize)
              scsi_out.status = SCSIIllegalRequest;
 
          DPRINTF(UFSHostDevice, "Write10 offset: 0x%8x, for %d blocks\n",
                  write_offset, write_size);

          statusCheck(scsi_out.status, scsi_out.senseCode);
          scsi_out.senseSize = scsi_out.senseCode[0];
          scsi_out.status = (scsi_out.status == SCSIGood) ? SCSIGood :
              SCSICheckCondition;
 
      } break;
 
      case SCSIWrite16: {
          uint8_t* tempptr = reinterpret_cast<uint8_t*>(&SCSI_msg[4]);

          uint32_t tmp = *reinterpret_cast<uint32_t*>(&tempptr[2]);
          uint64_t write_offset = betoh(tmp);
 
          tmp = *reinterpret_cast<uint32_t*>(&tempptr[6]);
          write_offset = (write_offset << 32) | betoh(tmp);
 
          tmp = *reinterpret_cast<uint32_t*>(&tempptr[10]);
          uint32_t write_size = betoh(tmp);
 
          scsi_out.msgSize = write_size * blkSize;
          scsi_out.offset = write_offset * blkSize;
          scsi_out.expectMore = 0x01;
 
          if ((write_offset + write_size) > diskSize)
              scsi_out.status = SCSIIllegalRequest;
 
          DPRINTF(UFSHostDevice, "Write16 offset: 0x%8x, for %d blocks\n",
                  write_offset, write_size);

          statusCheck(scsi_out.status, scsi_out.senseCode);
          scsi_out.senseSize = scsi_out.senseCode[0];
          scsi_out.status = (scsi_out.status == SCSIGood) ? SCSIGood :
              SCSICheckCondition;
 
      } break;
 
      case SCSIFormatUnit: {//not yet verified
          scsi_out.msgSize = 0;
          scsi_out.expectMore = 0x01;
 
      } break;
 
      case SCSISendDiagnostic: {//not yet verified
          scsi_out.msgSize = 0;
 
      } break;
 
      case SCSISynchronizeCache: {
          //do we have cache (we don't have cache at this moment)
          //TODO: here will synchronization happen when cache is modelled
          scsi_out.msgSize = 0;
 
      } break;
 
        //UFS SCSI additional command set for full functionality
      case SCSIModeSelect10:
        //TODO:
        //scsi_out.expectMore = 0x01;//not supported due to modepage support
        //code isn't dead, code suggest what is to be done when implemented
        break;
 
      case SCSIModeSense6: case SCSIModeSense10: {
          if ((SCSI_msg[4] & 0x3F0000) >> 16 == 0x0A) {//control page
              scsi_out.message.dataMsg.resize((sizeof(controlPage) >> 2) + 2);
              scsi_out.message.dataMsg[0] = 0x00000A00;//control page code
              scsi_out.message.dataMsg[1] = 0x00000000;//See JEDEC220 ch8
 
              for (uint8_t count = 0; count < 3; count++)
                  scsi_out.message.dataMsg[2 + count] = controlPage[count];
 
              scsi_out.msgSize = 20;
              DPRINTF(UFSHostDevice, "CONTROL page\n");
 
          } else if ((SCSI_msg[4] & 0x3F0000) >> 16 == 0x01) {//recovery page
              scsi_out.message.dataMsg.resize((sizeof(recoveryPage) >> 2)
                                              + 2);
 
              scsi_out.message.dataMsg[0] = 0x00000100;//recovery page code
              scsi_out.message.dataMsg[1] = 0x00000000;//See JEDEC220 ch8
 
              for (uint8_t count = 0; count < 3; count++)
                  scsi_out.message.dataMsg[2 + count] = recoveryPage[count];
 
              scsi_out.msgSize = 20;
              DPRINTF(UFSHostDevice, "RECOVERY page\n");
 
          } else if ((SCSI_msg[4] & 0x3F0000) >> 16 == 0x08) {//caching page
 
              scsi_out.message.dataMsg.resize((sizeof(cachingPage) >> 2) + 2);
              scsi_out.message.dataMsg[0] = 0x00001200;//caching page code
              scsi_out.message.dataMsg[1] = 0x00000000;//See JEDEC220 ch8
 
              for (uint8_t count = 0; count < 5; count++)
                  scsi_out.message.dataMsg[2 + count] = cachingPage[count];
 
              scsi_out.msgSize = 20;
              DPRINTF(UFSHostDevice, "CACHE page\n");
 
          } else if ((SCSI_msg[4] & 0x3F0000) >> 16 == 0x3F) {//ALL the pages!
 
              scsi_out.message.dataMsg.resize(((sizeof(controlPage) +
                                                sizeof(recoveryPage) +
                                                sizeof(cachingPage)) >> 2)
                                              + 2);
              scsi_out.message.dataMsg[0] = 0x00003200;//all page code
              scsi_out.message.dataMsg[1] = 0x00000000;//See JEDEC220 ch8
 
              for (uint8_t count = 0; count < 3; count++)
                  scsi_out.message.dataMsg[2 + count] = recoveryPage[count];
 
              for (uint8_t count = 0; count < 5; count++)
                  scsi_out.message.dataMsg[5 + count] = cachingPage[count];
 
              for (uint8_t count = 0; count < 3; count++)
                  scsi_out.message.dataMsg[10 + count] = controlPage[count];
 
              scsi_out.msgSize = 52;
              DPRINTF(UFSHostDevice, "Return ALL the pages!!!\n");
 
          } else inform("Wrong mode page requested\n");
 
          scsi_out.message.dataCount = scsi_out.msgSize << 24;
      } break;
 
      case SCSIRequestSense: {
          scsi_out.msgSize = 0;
 
      } break;
 
      case SCSIUnmap:break;//not yet verified
 
      case SCSIWriteBuffer: {
          scsi_out.expectMore = 0x01;
 
          uint8_t* tempptr = reinterpret_cast<uint8_t*>(&SCSI_msg[4]);

          uint32_t tmp = *reinterpret_cast<uint32_t*>(&tempptr[2]);
          uint64_t write_offset = betoh(tmp) & 0xFFFFFF;
 
          tmp = *reinterpret_cast<uint32_t*>(&tempptr[5]);
          uint32_t write_size = betoh(tmp) & 0xFFFFFF;
 
          scsi_out.msgSize =  write_size;
          scsi_out.offset = write_offset;
 
      } break;
 
      case SCSIReadBuffer: {
          scsi_out.expectMore = 0x02;
 
          uint8_t* tempptr = reinterpret_cast<uint8_t*>(&SCSI_msg[4]);

          uint32_t tmp = *reinterpret_cast<uint32_t*>(&tempptr[2]);
          uint64_t read_offset = betoh(tmp) & 0xFFFFFF;
 
          tmp = *reinterpret_cast<uint32_t*>(&tempptr[5]);
          uint32_t read_size = betoh(tmp) & 0xFFFFFF;
 
          scsi_out.msgSize = read_size;
          scsi_out.offset = read_offset;
 
          if ((read_offset + read_size) > capacityLower * blkSize)
              scsi_out.status = SCSIIllegalRequest;
 
          DPRINTF(UFSHostDevice, "Read buffer location: 0x%8x\n",
                  read_offset);
          DPRINTF(UFSHostDevice, "Number of bytes: 0x%8x\n", read_size);
 
          statusCheck(scsi_out.status, scsi_out.senseCode);
          scsi_out.senseSize = scsi_out.senseCode[0];
          scsi_out.status = (scsi_out.status == SCSIGood) ? SCSIGood :
              SCSICheckCondition;
 
      } break;
 
      case SCSIMaintenanceIn: {
          DPRINTF(UFSHostDevice, "Ignoring Maintenance In command\n");
          statusCheck(SCSIIllegalRequest, scsi_out.senseCode);
          scsi_out.senseSize = scsi_out.senseCode[0];
          scsi_out.status = (scsi_out.status == SCSIGood) ? SCSIGood :
              SCSICheckCondition;
          scsi_out.msgSize = 0;
      } break;
 
      default: {
          statusCheck(SCSIIllegalRequest, scsi_out.senseCode);
          scsi_out.senseSize = scsi_out.senseCode[0];
          scsi_out.status = (scsi_out.status == SCSIGood) ? SCSIGood :
              SCSICheckCondition;
          scsi_out.msgSize = 0;
          inform("Unsupported scsi message type: %2x\n", SCSI_msg[4] & 0xFF);
          inform("0x%8x\n", SCSI_msg[0]);
          inform("0x%8x\n", SCSI_msg[1]);
          inform("0x%8x\n", SCSI_msg[2]);
          inform("0x%8x\n", SCSI_msg[3]);
          inform("0x%8x\n", SCSI_msg[4]);
      } break;
    }
 
    return scsi_out;
}

 
void
UFSHostDevice::UFSSCSIDevice::statusCheck(uint8_t status,
                                uint8_t* sensecodelist)
{
    for (uint8_t count = 0; count < 19; count++)
        sensecodelist[count] = 0;
 
    sensecodelist[0] = 18; //sense length
    sensecodelist[1] = 0x70; //we send a valid frame
    sensecodelist[3] = status & 0xF; //mask to be sure + sensecode
    sensecodelist[8] = 0x1F; //data length
}

 
void
UFSHostDevice::UFSSCSIDevice::readFlash(uint8_t* readaddr, uint64_t offset,
                                   uint32_t size)
{
    for (int count = 0; count < (size / SectorSize); count++)
        flashDisk->read(&(readaddr[SectorSize*count]), (offset /
                                                        SectorSize) + count);
}

 
void
UFSHostDevice::UFSSCSIDevice::writeFlash(uint8_t* writeaddr, uint64_t offset,
                                    uint32_t size)
{
    for (int count = 0; count < (size / SectorSize); count++)
        flashDisk->write(&(writeaddr[SectorSize * count]),
                         (offset / SectorSize) + count);
}

 
UFSHostDevice::UFSHostDevice(const UFSHostDeviceParams &p) :
    DmaDevice(p),
    pioAddr(p.pio_addr),
    pioSize(0x0FFF),
    pioDelay(p.pio_latency),
    intNum(p.int_num),
    gic(p.gic),
    lunAvail(p.image.size()),
    UFSSlots(p.ufs_slots - 1),
    readPendingNum(0),
    writePendingNum(0),
    activeDoorbells(0),
    pendingDoorbells(0),
    countInt(0),
    transferTrack(0),
    taskCommandTrack(0),
    idlePhaseStart(0),
    stats(this),
    SCSIResumeEvent([this]{ SCSIStart(); }, name()),
    UTPEvent([this]{ finalUTP(); }, name())
{
    DPRINTF(UFSHostDevice, "The hostcontroller hosts %d Logic units\n",
            lunAvail);
    UFSDevice.resize(lunAvail);
 
    for (int count = 0; count < lunAvail; count++) {
        UFSDevice[count] = new UFSSCSIDevice(p, count,
                [this]() { LUNSignal(); },
                [this]() { readCallback(); });
    }
 
    if (UFSSlots > 31)
        warn("UFSSlots = %d, this will results in %d command slots",
             UFSSlots, (UFSSlots & 0x1F));
 
    if ((UFSSlots & 0x1F) == 0)
        fatal("Number of UFS command slots should be between 1 and 32.");
 
    setValues();
}
 
UFSHostDevice::
UFSHostDeviceStats::UFSHostDeviceStats(UFSHostDevice *parent)
    : statistics::Group(parent, "UFSDiskHost"),
      ADD_STAT(currentSCSIQueue, statistics::units::Count::get(),
               "Most up to date length of the command queue"),
      ADD_STAT(currentReadSSDQueue, statistics::units::Count::get(),
               "Most up to date length of the read SSD queue"),
      ADD_STAT(currentWriteSSDQueue, statistics::units::Count::get(),
               "Most up to date length of the write SSD queue"),
      ADD_STAT(totalReadSSD, statistics::units::Byte::get(),
               "Number of bytes read from SSD"),
      ADD_STAT(totalWrittenSSD, statistics::units::Byte::get(),
               "Number of bytes written to SSD"),
      ADD_STAT(totalReadDiskTransactions, statistics::units::Count::get(),
               "Number of transactions from disk"),
      ADD_STAT(totalWriteDiskTransactions, statistics::units::Count::get(),
               "Number of transactions to disk"),
      ADD_STAT(totalReadUFSTransactions, statistics::units::Count::get(),
               "Number of transactions from device"),
      ADD_STAT(totalWriteUFSTransactions, statistics::units::Count::get(),
               "Number of transactions to device"),
      ADD_STAT(averageReadSSDBW, statistics::units::Rate<
                    statistics::units::Byte, statistics::units::Second>::get(),
               "Average read bandwidth",
               totalReadSSD / simSeconds),
      ADD_STAT(averageWriteSSDBW, statistics::units::Rate<
                    statistics::units::Byte, statistics::units::Second>::get(),
               "Average write bandwidth",
               totalWrittenSSD / simSeconds),
      ADD_STAT(averageSCSIQueue, statistics::units::Rate<
                    statistics::units::Count, statistics::units::Tick>::get(),
               "Average command queue length"),
      ADD_STAT(averageReadSSDQueue, statistics::units::Rate<
                    statistics::units::Count, statistics::units::Tick>::get(),
               "Average read queue length"),
      ADD_STAT(averageWriteSSDQueue, statistics::units::Rate<
                    statistics::units::Count, statistics::units::Tick>::get(),
               "Average write queue length"),
      ADD_STAT(curDoorbell, statistics::units::Count::get(),
               "Most up to date number of doorbells used",
               parent->activeDoorbells),
      ADD_STAT(maxDoorbell, statistics::units::Count::get(),
               "Maximum number of doorbells utilized"),
      ADD_STAT(averageDoorbell, statistics::units::Rate<
                    statistics::units::Count, statistics::units::Tick>::get(),
               "Average number of Doorbells used"),
      ADD_STAT(transactionLatency, statistics::units::Tick::get(),
               "Histogram of transaction times"),
      ADD_STAT(idleTimes, statistics::units::Tick::get(), "Histogram of idle times")
{
    using namespace statistics;
 
    // Register the stats
    currentSCSIQueue
        .flags(none);
    currentReadSSDQueue
        .flags(none);
    currentWriteSSDQueue
        .flags(none);

    totalReadSSD
        .flags(none);
 
    totalWrittenSSD
        .flags(none);
 
    totalReadDiskTransactions
        .flags(none);
    totalWriteDiskTransactions
        .flags(none);
    totalReadUFSTransactions
        .flags(none);
    totalWriteUFSTransactions
        .flags(none);

    averageReadSSDBW
        .flags(nozero);
 
    averageWriteSSDBW
        .flags(nozero);
 
    averageSCSIQueue
        .flags(nozero);
    averageReadSSDQueue
        .flags(nozero);
    averageWriteSSDQueue
        .flags(nozero);

    curDoorbell
        .flags(none);
 
    maxDoorbell
        .flags(none);
    averageDoorbell
        .flags(nozero);

    transactionLatency
        .init(100)
        .flags(pdf);
 
    idleTimes
        .init(100)
        .flags(pdf);
}

void UFSHostDevice::setValues()
{
    UFSHCIMem.HCCAP = 0x06070000 | (UFSSlots & 0x1F);
    UFSHCIMem.HCversion = 0x00010000; //version is 1.0
    UFSHCIMem.HCHCDDID = 0xAA003C3C;// Arbitrary number
    UFSHCIMem.HCHCPMID = 0x41524D48; //ARMH (not an official MIPI number)
    UFSHCIMem.TRUTRLDBR = 0x00;
    UFSHCIMem.TMUTMRLDBR = 0x00;
    UFSHCIMem.CMDUICCMDR = 0x00;
    // We can process CMD, TM, TR, device present
    UFSHCIMem.ORHostControllerStatus = 0x08;
    UFSHCIMem.TRUTRLBA = 0x00;
    UFSHCIMem.TRUTRLBAU = 0x00;
    UFSHCIMem.TMUTMRLBA = 0x00;
    UFSHCIMem.TMUTMRLBAU = 0x00;
}

 
AddrRangeList
UFSHostDevice::getAddrRanges() const
{
    AddrRangeList ranges;
    ranges.push_back(RangeSize(pioAddr, pioSize));
    return ranges;
}

 
Tick
UFSHostDevice::read(PacketPtr pkt)
{
    uint32_t data = 0;
 
    switch (pkt->getAddr() & 0xFF)
    {
 
      case regControllerCapabilities:
        data = UFSHCIMem.HCCAP;
        break;
 
      case regUFSVersion:
        data = UFSHCIMem.HCversion;
        break;
 
      case regControllerDEVID:
        data = UFSHCIMem.HCHCDDID;
        break;
 
      case regControllerPRODID:
        data = UFSHCIMem.HCHCPMID;
        break;
 
      case regInterruptStatus:
        data = UFSHCIMem.ORInterruptStatus;
        UFSHCIMem.ORInterruptStatus = 0x00;
        //TODO: Revise and extend
        clearInterrupt();
        break;
 
      case regInterruptEnable:
        data = UFSHCIMem.ORInterruptEnable;
        break;
 
      case regControllerStatus:
        data = UFSHCIMem.ORHostControllerStatus;
        break;
 
      case regControllerEnable:
        data = UFSHCIMem.ORHostControllerEnable;
        break;
 
      case regUICErrorCodePHYAdapterLayer:
        data = UFSHCIMem.ORUECPA;
        break;
 
      case regUICErrorCodeDataLinkLayer:
        data = UFSHCIMem.ORUECDL;
        break;
 
      case regUICErrorCodeNetworkLayer:
        data = UFSHCIMem.ORUECN;
        break;
 
      case regUICErrorCodeTransportLayer:
        data = UFSHCIMem.ORUECT;
        break;
 
      case regUICErrorCodeDME:
        data = UFSHCIMem.ORUECDME;
        break;
 
      case regUTPTransferREQINTAGGControl:
        data = UFSHCIMem.ORUTRIACR;
        break;
 
      case regUTPTransferREQListBaseL:
        data = UFSHCIMem.TRUTRLBA;
        break;
 
      case regUTPTransferREQListBaseH:
        data = UFSHCIMem.TRUTRLBAU;
        break;
 
      case regUTPTransferREQDoorbell:
        data = UFSHCIMem.TRUTRLDBR;
        break;
 
      case regUTPTransferREQListClear:
        data = UFSHCIMem.TRUTRLCLR;
        break;
 
      case regUTPTransferREQListRunStop:
        data = UFSHCIMem.TRUTRLRSR;
        break;
 
      case regUTPTaskREQListBaseL:
        data = UFSHCIMem.TMUTMRLBA;
        break;
 
      case regUTPTaskREQListBaseH:
        data = UFSHCIMem.TMUTMRLBAU;
        break;
 
      case regUTPTaskREQDoorbell:
        data = UFSHCIMem.TMUTMRLDBR;
        break;
 
      case regUTPTaskREQListClear:
        data = UFSHCIMem.TMUTMRLCLR;
        break;
 
      case regUTPTaskREQListRunStop:
        data = UFSHCIMem.TMUTMRLRSR;
        break;
 
      case regUICCommand:
        data = UFSHCIMem.CMDUICCMDR;
        break;
 
      case regUICCommandArg1:
        data = UFSHCIMem.CMDUCMDARG1;
        break;
 
      case regUICCommandArg2:
        data = UFSHCIMem.CMDUCMDARG2;
        break;
 
      case regUICCommandArg3:
        data = UFSHCIMem.CMDUCMDARG3;
        break;
 
      default:
        data = 0x00;
        break;
    }
 
    pkt->setLE<uint32_t>(data);
    pkt->makeResponse();
    return pioDelay;
}

Tick
UFSHostDevice::write(PacketPtr pkt)
{
    assert(pkt->getSize() <= 4);
 
    const uint32_t data = pkt->getUintX(ByteOrder::little);
 
    switch (pkt->getAddr() & 0xFF)
    {
      case regControllerCapabilities://you shall not write to this
        break;
 
      case regUFSVersion://you shall not write to this
        break;
 
      case regControllerDEVID://you shall not write to this
        break;
 
      case regControllerPRODID://you shall not write to this
        break;
 
      case regInterruptStatus://you shall not write to this
        break;
 
      case regInterruptEnable:
        UFSHCIMem.ORInterruptEnable = data;
        break;
 
      case regControllerStatus:
        UFSHCIMem.ORHostControllerStatus = data;
        break;
 
      case regControllerEnable:
        UFSHCIMem.ORHostControllerEnable = data;
        break;
 
      case regUICErrorCodePHYAdapterLayer:
        UFSHCIMem.ORUECPA = data;
        break;
 
      case regUICErrorCodeDataLinkLayer:
        UFSHCIMem.ORUECDL = data;
        break;
 
      case regUICErrorCodeNetworkLayer:
        UFSHCIMem.ORUECN = data;
        break;
 
      case regUICErrorCodeTransportLayer:
        UFSHCIMem.ORUECT = data;
        break;
 
      case regUICErrorCodeDME:
        UFSHCIMem.ORUECDME = data;
        break;
 
      case regUTPTransferREQINTAGGControl:
        UFSHCIMem.ORUTRIACR = data;
        break;
 
      case regUTPTransferREQListBaseL:
        UFSHCIMem.TRUTRLBA = data;
        if (((UFSHCIMem.TRUTRLBA | UFSHCIMem.TRUTRLBAU) != 0x00) &&
            ((UFSHCIMem.TMUTMRLBA | UFSHCIMem.TMUTMRLBAU)!= 0x00))
            UFSHCIMem.ORHostControllerStatus |= UICCommandReady;
        break;
 
      case regUTPTransferREQListBaseH:
        UFSHCIMem.TRUTRLBAU = data;
        if (((UFSHCIMem.TRUTRLBA | UFSHCIMem.TRUTRLBAU) != 0x00) &&
            ((UFSHCIMem.TMUTMRLBA | UFSHCIMem.TMUTMRLBAU) != 0x00))
            UFSHCIMem.ORHostControllerStatus |= UICCommandReady;
        break;
 
      case regUTPTransferREQDoorbell:
        if (!(UFSHCIMem.TRUTRLDBR) && data)
            stats.idleTimes.sample(curTick() - idlePhaseStart);
        UFSHCIMem.TRUTRLDBR |= data;
        requestHandler();
        break;
 
      case regUTPTransferREQListClear:
        UFSHCIMem.TRUTRLCLR = data;
        break;
 
      case regUTPTransferREQListRunStop:
        UFSHCIMem.TRUTRLRSR = data;
        break;
 
      case regUTPTaskREQListBaseL:
        UFSHCIMem.TMUTMRLBA = data;
        if (((UFSHCIMem.TRUTRLBA | UFSHCIMem.TRUTRLBAU) != 0x00) &&
            ((UFSHCIMem.TMUTMRLBA | UFSHCIMem.TMUTMRLBAU) != 0x00))
            UFSHCIMem.ORHostControllerStatus |= UICCommandReady;
        break;
 
      case regUTPTaskREQListBaseH:
        UFSHCIMem.TMUTMRLBAU = data;
        if (((UFSHCIMem.TRUTRLBA | UFSHCIMem.TRUTRLBAU) != 0x00) &&
            ((UFSHCIMem.TMUTMRLBA | UFSHCIMem.TMUTMRLBAU) != 0x00))
            UFSHCIMem.ORHostControllerStatus |= UICCommandReady;
        break;
 
      case regUTPTaskREQDoorbell:
        UFSHCIMem.TMUTMRLDBR |= data;
        requestHandler();
        break;
 
      case regUTPTaskREQListClear:
        UFSHCIMem.TMUTMRLCLR = data;
        break;
 
      case regUTPTaskREQListRunStop:
        UFSHCIMem.TMUTMRLRSR = data;
        break;
 
      case regUICCommand:
        UFSHCIMem.CMDUICCMDR = data;
        requestHandler();
        break;
 
      case regUICCommandArg1:
        UFSHCIMem.CMDUCMDARG1 = data;
        break;
 
      case regUICCommandArg2:
        UFSHCIMem.CMDUCMDARG2 = data;
        break;
 
      case regUICCommandArg3:
        UFSHCIMem.CMDUCMDARG3 = data;
        break;
 
      default:break;//nothing happens, you try to access a register that
                    //does not exist
 
    }
 
    pkt->makeResponse();
    return pioDelay;
}

 
void
UFSHostDevice::requestHandler()
{
    Addr address = 0x00;
    int mask = 0x01;
    int size;
    int count = 0;
    struct taskStart task_info;
    struct transferStart transferstart_info;
    transferstart_info.done = 0;

    while (((UFSHCIMem.CMDUICCMDR > 0x00) |
            ((UFSHCIMem.TMUTMRLDBR ^ taskCommandTrack) > 0x00) |
            ((UFSHCIMem.TRUTRLDBR ^ transferTrack) > 0x00)) ) {
 
        if (UFSHCIMem.CMDUICCMDR > 0x00) {
            commandHandler();
            UFSHCIMem.ORInterruptStatus |= UICCommandCOMPL;
            generateInterrupt();
            UFSHCIMem.CMDUICCMDR = 0x00;
            return; //command, nothing more we can do
 
        } else if ((UFSHCIMem.TMUTMRLDBR ^ taskCommandTrack) > 0x00) {
            size = sizeof(UTPUPIUTaskReq);
            count = findLsbSet((UFSHCIMem.TMUTMRLDBR ^ taskCommandTrack));
            address = UFSHCIMem.TMUTMRLBAU;
            //<-64 bit
            address = (count * size) + (address << 32) +
                UFSHCIMem.TMUTMRLBA;
            taskCommandTrack |= mask << count;
 
            inform("UFSmodel received a task from the system; this might"
                   " lead to untested behaviour.\n");
 
            task_info.mask = mask << count;
            task_info.address = address;
            task_info.size = size;
            task_info.done = UFSHCIMem.TMUTMRLDBR;
            taskInfo.push_back(task_info);
            taskEventQueue.push_back(
                EventFunctionWrapper([this]{ taskStart(); }, name()));
            writeDevice(&taskEventQueue.back(), false, address, size,
                        reinterpret_cast<uint8_t*>
                        (&taskInfo.back().destination), 0, 0);
 
        } else if ((UFSHCIMem.TRUTRLDBR ^ transferTrack) > 0x00) {
            size = sizeof(UTPTransferReqDesc);
            count = findLsbSet((UFSHCIMem.TRUTRLDBR ^ transferTrack));
            address = UFSHCIMem.TRUTRLBAU;
            //<-64 bit
            address = (count * size) + (address << 32) + UFSHCIMem.TRUTRLBA;
 
            transferTrack |= mask << count;
            DPRINTF(UFSHostDevice, "Doorbell register: 0x%8x select #:"
                    " 0x%8x completion info: 0x%8x\n", UFSHCIMem.TRUTRLDBR,
                    count, transferstart_info.done);
 
            transferstart_info.done = UFSHCIMem.TRUTRLDBR;

            transactionStart[count] = curTick(); //note the start time
            ++activeDoorbells;
            stats.maxDoorbell = (stats.maxDoorbell.value() < activeDoorbells)
                ? activeDoorbells : stats.maxDoorbell.value();
            stats.averageDoorbell = stats.maxDoorbell.value();

            transferstart_info.mask = mask << count;
            transferstart_info.address = address;
            transferstart_info.size = size;
            transferstart_info.done = UFSHCIMem.TRUTRLDBR;
            transferStartInfo.push_back(transferstart_info);

            transferStartInfo.back().destination = new struct
                UTPTransferReqDesc;
            DPRINTF(UFSHostDevice, "Initial transfer start: 0x%8x\n",
                    transferstart_info.done);
            transferEventQueue.push_back(
                EventFunctionWrapper([this]{ transferStart(); }, name()));
 
            if (transferEventQueue.size() < 2) {
                writeDevice(&transferEventQueue.front(), false,
                            address, size, reinterpret_cast<uint8_t*>
                            (transferStartInfo.front().destination),0, 0);
                DPRINTF(UFSHostDevice, "Transfer scheduled\n");
            }
        }
    }
}

 
void
UFSHostDevice::taskStart()
{
    DPRINTF(UFSHostDevice, "Task start");
    taskHandler(&taskInfo.front().destination, taskInfo.front().mask,
                taskInfo.front().address, taskInfo.front().size);
    taskInfo.pop_front();
    taskEventQueue.pop_front();
}

 
void
UFSHostDevice::transferStart()
{
    DPRINTF(UFSHostDevice, "Enter transfer event\n");
    transferHandler(transferStartInfo.front().destination,
                    transferStartInfo.front().mask,
                    transferStartInfo.front().address,
                    transferStartInfo.front().size,
                    transferStartInfo.front().done);
 
    transferStartInfo.pop_front();
    DPRINTF(UFSHostDevice, "Transfer queue size at end of event: "
            "0x%8x\n", transferEventQueue.size());
}

 
void
UFSHostDevice::commandHandler()
{
    if (UFSHCIMem.CMDUICCMDR == 0x16) {
        UFSHCIMem.ORHostControllerStatus |= 0x0F;//link startup
    }
 
}

 
void
UFSHostDevice::taskHandler(struct UTPUPIUTaskReq* request_in,
                           uint32_t req_pos, Addr finaladdress, uint32_t
                           finalsize)
{
    inform("taskHandler\n");
    inform("%8x\n", request_in->header.dWord0);
    inform("%8x\n", request_in->header.dWord1);
    inform("%8x\n", request_in->header.dWord2);
 
    request_in->header.dWord2 &= 0xffffff00;
 
    UFSHCIMem.TMUTMRLDBR &= ~(req_pos);
    taskCommandTrack &= ~(req_pos);
    UFSHCIMem.ORInterruptStatus |= UTPTaskREQCOMPL;
 
    readDevice(true, finaladdress, finalsize, reinterpret_cast<uint8_t*>
               (request_in), true, NULL);
 
}

 
void
UFSHostDevice::transferHandler(struct UTPTransferReqDesc* request_in,
                               int req_pos, Addr finaladdress, uint32_t
                               finalsize, uint32_t done)
{
 
    Addr cmd_desc_addr = 0x00;
 
 
    //acknowledge handling of the message
    DPRINTF(UFSHostDevice, "SCSI message detected\n");
    request_in->header.dWord2 &= 0xffffff00;
    SCSIInfo.RequestIn = request_in;
    SCSIInfo.reqPos = req_pos;
    SCSIInfo.finalAddress = finaladdress;
    SCSIInfo.finalSize = finalsize;
    SCSIInfo.destination.resize(request_in->PRDTableOffset * 4
        + request_in->PRDTableLength * sizeof(UFSHCDSGEntry));
    SCSIInfo.done = done;
 
    assert(!SCSIResumeEvent.scheduled());
    cmd_desc_addr = request_in->commandDescBaseAddrHi;
    cmd_desc_addr = (cmd_desc_addr << 32) |
        (request_in->commandDescBaseAddrLo & 0xffffffff);
 
    writeDevice(&SCSIResumeEvent, false, cmd_desc_addr,
                SCSIInfo.destination.size(), &SCSIInfo.destination[0],0, 0);
 
    DPRINTF(UFSHostDevice, "SCSI scheduled\n");
 
    transferEventQueue.pop_front();
}

 
void
UFSHostDevice::SCSIStart()
{
    DPRINTF(UFSHostDevice, "SCSI message on hold until ready\n");
    uint32_t LUN = SCSIInfo.destination[2];
    UFSDevice[LUN]->SCSIInfoQueue.push_back(SCSIInfo);
 
    DPRINTF(UFSHostDevice, "SCSI queue %d has %d elements\n", LUN,
            UFSDevice[LUN]->SCSIInfoQueue.size());

    if (UFSDevice[LUN]->SCSIInfoQueue.size() < 2) //LUN is available
        SCSIResume(LUN);
 
    else if (UFSDevice[LUN]->SCSIInfoQueue.size() > 32)
        panic("SCSI queue is getting too big %d\n", UFSDevice[LUN]->
              SCSIInfoQueue.size());

    if (!transferEventQueue.empty()) {

        writeDevice(&transferEventQueue.front(), false,
                    transferStartInfo.front().address,
                    transferStartInfo.front().size, reinterpret_cast<uint8_t*>
                    (transferStartInfo.front().destination), 0, 0);
 
        DPRINTF(UFSHostDevice, "Transfer scheduled");
    }
}

 
void
UFSHostDevice::SCSIResume(uint32_t lun_id)
{
    DPRINTF(UFSHostDevice, "SCSIresume\n");
    if (UFSDevice[lun_id]->SCSIInfoQueue.empty())
        panic("No SCSI message scheduled lun:%d Doorbell: 0x%8x", lun_id,
              UFSHCIMem.TRUTRLDBR);

    struct UTPTransferReqDesc* request_in = UFSDevice[lun_id]->
        SCSIInfoQueue.front().RequestIn;
 
    uint32_t req_pos = UFSDevice[lun_id]->SCSIInfoQueue.front().reqPos;
 
    Addr finaladdress = UFSDevice[lun_id]->SCSIInfoQueue.front().
        finalAddress;
 
    uint32_t finalsize = UFSDevice[lun_id]->SCSIInfoQueue.front().finalSize;
 
    uint32_t* transfercommand = reinterpret_cast<uint32_t*>
        (&(UFSDevice[lun_id]->SCSIInfoQueue.front().destination[0]));
 
    DPRINTF(UFSHostDevice, "Task tag: 0x%8x\n", transfercommand[0]>>24);
    request_out_datain = UFSDevice[(transfercommand[0] & 0xFF0000) >> 16]->
        SCSICMDHandle(transfercommand);
 
    DPRINTF(UFSHostDevice, "LUN: %d\n", request_out_datain.LUN);

    request_in->header.dWord0 = ((request_in->header.dWord0 >> 24) == 0x21)
        ? 0x36 : 0x21;
    UFSDevice[lun_id]->transferInfo.requestOut.header.dWord0 =
        request_in->header.dWord0 | (request_out_datain.LUN << 8)
        | (transfercommand[0] & 0xFF000000);
    UFSDevice[lun_id]->transferInfo.requestOut.header.dWord1 = 0x00000000 |
        (request_out_datain.status << 24);
    UFSDevice[lun_id]->transferInfo.requestOut.header.dWord2 = 0x00000000 |
        ((request_out_datain.senseSize + 2) << 24) | 0x05;
    UFSDevice[lun_id]->transferInfo.requestOut.senseDataLen =
        request_out_datain.senseSize;
 
    //data
    for (uint8_t count = 0; count<request_out_datain.senseSize; count++) {
        UFSDevice[lun_id]->transferInfo.requestOut.senseData[count] =
            request_out_datain.senseCode[count + 1];
    }
 
    /*
     * At position defined by "request_in->PRDTableOffset" (counting 32 bit
     * words) in array "transfercommand" we have a scatter gather list, which
     * is usefull to us if we interpreted it as a UFSHCDSGEntry structure.
     */
    struct UFSHCDSGEntry* sglist =  reinterpret_cast<UFSHCDSGEntry*>
        (&(transfercommand[(request_in->PRDTableOffset)]));
 
    uint32_t length = request_in->PRDTableLength;
    DPRINTF(UFSHostDevice, "# PRDT entries: %d\n", length);
 
    Addr response_addr = request_in->commandDescBaseAddrHi;
    response_addr = (response_addr << 32) |
        ((request_in->commandDescBaseAddrLo +
          (request_in->responseUPIULength << 2)) & 0xffffffff);

    UFSDevice[lun_id]->transferInfo.responseStartAddr = response_addr;
    UFSDevice[lun_id]->transferInfo.reqPos = req_pos;
    UFSDevice[lun_id]->transferInfo.size = finalsize;
    UFSDevice[lun_id]->transferInfo.address = finaladdress;
    UFSDevice[lun_id]->transferInfo.destination = reinterpret_cast<uint8_t*>
        (UFSDevice[lun_id]->SCSIInfoQueue.front().RequestIn);
    UFSDevice[lun_id]->transferInfo.finished = true;
    UFSDevice[lun_id]->transferInfo.lunID = request_out_datain.LUN;

    if (request_out_datain.expectMore == 0x01) {
        manageWriteTransfer(request_out_datain.LUN, request_out_datain.offset,
                            length, sglist);
 
    } else if (request_out_datain.expectMore == 0x02) {
        manageReadTransfer(request_out_datain.msgSize, request_out_datain.LUN,
                           request_out_datain.offset, length, sglist);
 
    } else {
        uint32_t count = 0;
        uint32_t size_accum = 0;
        DPRINTF(UFSHostDevice, "Data DMA size: 0x%8x\n",
                request_out_datain.msgSize);

        while ((length > count) && size_accum
               < (request_out_datain.msgSize - 1) &&
               (request_out_datain.msgSize != 0x00)) {
            Addr SCSI_start = sglist[count].upperAddr;
            SCSI_start = (SCSI_start << 32) |
                (sglist[count].baseAddr & 0xFFFFFFFF);
            DPRINTF(UFSHostDevice, "Data DMA start: 0x%8x\n", SCSI_start);
            DPRINTF(UFSHostDevice, "Data DMA size: 0x%8x\n",
                    (sglist[count].size + 1));
            uint32_t size_to_send = sglist[count].size + 1;
 
            if (request_out_datain.msgSize < (size_to_send + size_accum))
                size_to_send = request_out_datain.msgSize - size_accum;
 
            readDevice(false, SCSI_start, size_to_send,
                       reinterpret_cast<uint8_t*>
                       (&(request_out_datain.message.dataMsg[size_accum])),
                       false, NULL);
 
            size_accum += size_to_send;
            DPRINTF(UFSHostDevice, "Total remaining: 0x%8x,accumulated so far"
                    " : 0x%8x\n", (request_out_datain.msgSize - size_accum),
                    size_accum);
 
            ++count;
            DPRINTF(UFSHostDevice, "Transfer #: %d\n", count);
        }

        transferDone(response_addr, req_pos, UFSDevice[lun_id]->
                     transferInfo.requestOut, finalsize, finaladdress,
                     reinterpret_cast<uint8_t*>(request_in), true, lun_id);
    }
 
    DPRINTF(UFSHostDevice, "SCSI resume done\n");
}

void
UFSHostDevice::LUNSignal()
{
    uint8_t this_lun = 0;
 
    //while we haven't found the right lun, keep searching
    while ((this_lun < lunAvail) && !UFSDevice[this_lun]->finishedCommand())
        ++this_lun;
 
    if (this_lun < lunAvail) {
        //Clear signal.
        UFSDevice[this_lun]->clearSignal();
        //found it; call transferDone
        transferDone(UFSDevice[this_lun]->transferInfo.responseStartAddr,
                     UFSDevice[this_lun]->transferInfo.reqPos,
                     UFSDevice[this_lun]->transferInfo.requestOut,
                     UFSDevice[this_lun]->transferInfo.size,
                     UFSDevice[this_lun]->transferInfo.address,
                     UFSDevice[this_lun]->transferInfo.destination,
                     UFSDevice[this_lun]->transferInfo.finished,
                     UFSDevice[this_lun]->transferInfo.lunID);
    }
 
    else
        panic("no LUN finished in tick %d\n", curTick());
}

 
void
UFSHostDevice::transferDone(Addr responseStartAddr, uint32_t req_pos,
                            struct UTPUPIURSP request_out, uint32_t size,
                            Addr address, uint8_t* destination,
                            bool finished, uint32_t lun_id)
{
    if (UFSDevice[lun_id]->SCSIInfoQueue.empty())
        panic("No SCSI message scheduled lun:%d Doorbell: 0x%8x", lun_id,
              UFSHCIMem.TRUTRLDBR);
 
    DPRINTF(UFSHostDevice, "DMA start: 0x%8x; DMA size: 0x%8x\n",
            responseStartAddr, sizeof(request_out));
 
    struct transferStart lastinfo;
    lastinfo.mask = req_pos;
    lastinfo.done = finished;
    lastinfo.address = address;
    lastinfo.size = size;
    lastinfo.destination = reinterpret_cast<UTPTransferReqDesc*>
        (destination);
    lastinfo.lun_id = lun_id;
 
    transferEnd.push_back(lastinfo);
 
    DPRINTF(UFSHostDevice, "Transfer done start\n");
 
    readDevice(false, responseStartAddr, sizeof(request_out),
               reinterpret_cast<uint8_t*>
               (&(UFSDevice[lun_id]->transferInfo.requestOut)),
               true, &UTPEvent);
}

 
void
UFSHostDevice::finalUTP()
{
    uint32_t lun_id = transferEnd.front().lun_id;
 
    UFSDevice[lun_id]->SCSIInfoQueue.pop_front();
    DPRINTF(UFSHostDevice, "SCSIInfoQueue size: %d, lun: %d\n",
            UFSDevice[lun_id]->SCSIInfoQueue.size(), lun_id);

    if (UFSHCIMem.TRUTRLDBR & transferEnd.front().mask) {
        uint8_t count = 0;
        while (!(transferEnd.front().mask & (0x1 << count)))
            ++count;
        stats.transactionLatency.sample(curTick() -
                                        transactionStart[count]);
    }

    readDevice(true, transferEnd.front().address,
               transferEnd.front().size, reinterpret_cast<uint8_t*>
               (transferEnd.front().destination), true, NULL);

    transferTrack &= ~(transferEnd.front().mask);
    --activeDoorbells;
    ++pendingDoorbells;
    garbage.push_back(transferEnd.front().destination);
    transferEnd.pop_front();
    DPRINTF(UFSHostDevice, "UTP handled\n");

    stats.averageDoorbell = stats.maxDoorbell.value();
 
    DPRINTF(UFSHostDevice, "activeDoorbells: %d, pendingDoorbells: %d,"
            " garbage: %d, TransferEvent: %d\n", activeDoorbells,
            pendingDoorbells, garbage.size(), transferEventQueue.size());

    if (!UFSDevice[lun_id]->SCSIInfoQueue.empty())
        SCSIResume(lun_id);
}

void
UFSHostDevice::readDone()
{
    DPRINTF(UFSHostDevice, "Read done start\n");
    --readPendingNum;

    if (garbage.size() > 0) {
        delete garbage.front();
        garbage.pop_front();
        }

    if (!(UFSHCIMem.ORInterruptStatus & 0x01)) {
        UFSHCIMem.ORInterruptStatus |= UTPTransferREQCOMPL;
        generateInterrupt();
    }
 
 
    if (!readDoneEvent.empty()) {
        readDoneEvent.pop_front();
    }
}

 
void
UFSHostDevice::generateInterrupt()
{
    countInt++;

    UFSHCIMem.TRUTRLDBR &= transferTrack;
    pendingDoorbells = 0;
    DPRINTF(UFSHostDevice, "Clear doorbell %X\n", UFSHCIMem.TRUTRLDBR);
 
    checkDrain();

    gic->sendInt(intNum);
    DPRINTF(UFSHostDevice, "Send interrupt @ transaction: 0x%8x!\n",
            countInt);
}

 
void
UFSHostDevice::clearInterrupt()
{
    gic->clearInt(intNum);
    DPRINTF(UFSHostDevice, "Clear interrupt: 0x%8x!\n", countInt);
 
    checkDrain();
 
    if (!(UFSHCIMem.TRUTRLDBR)) {
        idlePhaseStart = curTick();
    }
}

 

 
void
UFSHostDevice::writeDevice(Event* additional_action, bool toDisk, Addr
                           start, int size, uint8_t* destination, uint64_t
                           SCSIDiskOffset, uint32_t lun_id)
{
    DPRINTF(UFSHostDevice, "Write transaction Start: 0x%8x; Size: %d\n",
            start, size);

    if (toDisk) {
        ++writePendingNum;
 
        while (!writeDoneEvent.empty() && (writeDoneEvent.front().when()
                                          < curTick()))
            writeDoneEvent.pop_front();
 
        writeDoneEvent.push_back(
            EventFunctionWrapper([this]{ writeDone(); },
                                 name()));
        assert(!writeDoneEvent.back().scheduled());

        struct transferInfo new_transfer;
        new_transfer.offset = SCSIDiskOffset;
        new_transfer.size = size;
        new_transfer.lunID = lun_id;
        new_transfer.filePointer = 0;
        SSDWriteinfo.push_back(new_transfer);

        SSDWriteinfo.back().buffer.resize(size);

        dmaPort.dmaAction(MemCmd::ReadReq, start, size,
                          &writeDoneEvent.back(),
                          &SSDWriteinfo.back().buffer[0], 0);
        //yes, a readreq at a write device function is correct.
        DPRINTF(UFSHostDevice, "Write to disk scheduled\n");
 
    } else {
        assert(!additional_action->scheduled());
        dmaPort.dmaAction(MemCmd::ReadReq, start, size,
                          additional_action, destination, 0);
        DPRINTF(UFSHostDevice, "Write scheduled\n");
    }
}

 
void
UFSHostDevice::manageWriteTransfer(uint8_t LUN, uint64_t offset, uint32_t
                                   sg_table_length, struct UFSHCDSGEntry*
                                   sglist)
{
    struct writeToDiskBurst next_packet;
 
    next_packet.SCSIDiskOffset = offset;
 
    UFSDevice[LUN]->setTotalWrite(sg_table_length);

    for (uint32_t count = 0; count < sg_table_length; count++) {
        next_packet.start = sglist[count].upperAddr;
        next_packet.start = (next_packet.start << 32) |
            (sglist[count].baseAddr & 0xFFFFFFFF);
        next_packet.LUN = LUN;
        DPRINTF(UFSHostDevice, "Write data DMA start: 0x%8x\n",
                next_packet.start);
        DPRINTF(UFSHostDevice, "Write data DMA size: 0x%8x\n",
                (sglist[count].size + 1));
        assert(sglist[count].size > 0);
 
        if (count != 0)
            next_packet.SCSIDiskOffset = next_packet.SCSIDiskOffset +
                (sglist[count - 1].size + 1);
 
        next_packet.size = sglist[count].size + 1;

        if (dmaWriteInfo.empty())
            writeDevice(NULL, true, next_packet.start, next_packet.size,
                        NULL, next_packet.SCSIDiskOffset, next_packet.LUN);
        else
            DPRINTF(UFSHostDevice, "Write not initiated queue: %d\n",
                    dmaWriteInfo.size());
 
        dmaWriteInfo.push_back(next_packet);
        DPRINTF(UFSHostDevice, "Write Location: 0x%8x\n",
                next_packet.SCSIDiskOffset);
 
        DPRINTF(UFSHostDevice, "Write transfer #: 0x%8x\n", count + 1);

        stats.totalWrittenSSD += (sglist[count].size + 1);
    }

    ++stats.totalWriteUFSTransactions;
}

 
void
UFSHostDevice::writeDone()
{
    assert(dmaWriteInfo.size() > 0);
    dmaWriteInfo.pop_front();
    assert(SSDWriteinfo.size() > 0);
    uint32_t lun = SSDWriteinfo.front().lunID;

    DPRINTF(UFSHostDevice, "Write done entered, queue: %d\n",
            UFSDevice[lun]->SSDWriteDoneInfo.size());
    UFSDevice[lun]->writeFlash(&SSDWriteinfo.front().buffer[0],
                               SSDWriteinfo.front().offset,
                               SSDWriteinfo.front().size);

    UFSDevice[lun]->SSDWriteDoneInfo.push_back(SSDWriteinfo.front());
    SSDWriteinfo.pop_front();
 
    --writePendingNum;
    UFSDevice[lun]->SSDWriteStart();

    stats.currentWriteSSDQueue = UFSDevice[lun]->SSDWriteDoneInfo.size();
    stats.averageWriteSSDQueue = UFSDevice[lun]->SSDWriteDoneInfo.size();
    ++stats.totalWriteDiskTransactions;

    if (!dmaWriteInfo.empty())
        writeDevice(NULL, true, dmaWriteInfo.front().start,
                    dmaWriteInfo.front().size,  NULL,
                    dmaWriteInfo.front().SCSIDiskOffset,
                    dmaWriteInfo.front().LUN);
    DPRINTF(UFSHostDevice, "Write done end\n");
}

void
UFSHostDevice::UFSSCSIDevice::SSDWriteStart()
{
    assert(SSDWriteDoneInfo.size() > 0);
    flashDevice->writeMemory(
        SSDWriteDoneInfo.front().offset,
        SSDWriteDoneInfo.front().size, memWriteCallback);
 
    SSDWriteDoneInfo.pop_front();
 
    DPRINTF(UFSHostDevice, "Write is started; left in queue: %d\n",
            SSDWriteDoneInfo.size());
}
 

 
void
UFSHostDevice::UFSSCSIDevice::SSDWriteDone()
{
    DPRINTF(UFSHostDevice, "Write disk, aiming for %d messages, %d so far\n",
            totalWrite, amountOfWriteTransfers);
 
    //we have done one extra transfer
    ++amountOfWriteTransfers;

    assert(totalWrite >= amountOfWriteTransfers && totalWrite != 0);

    if (totalWrite == amountOfWriteTransfers) {
        DPRINTF(UFSHostDevice, "Write transactions finished\n");
        totalWrite = 0;
        amountOfWriteTransfers = 0;
 
        //Callback UFS Host
        setSignal();
        signalDone();
    }
 
}

 
void
UFSHostDevice::readDevice(bool lastTransfer, Addr start, uint32_t size,
                          uint8_t* destination, bool no_cache, Event*
                          additional_action)
{
    DPRINTF(UFSHostDevice, "Read start: 0x%8x; Size: %d, data[0]: 0x%8x\n",
            start, size, (reinterpret_cast<uint32_t *>(destination))[0]);

    if (lastTransfer) {
        ++readPendingNum;
        readDoneEvent.push_back(
            EventFunctionWrapper([this]{ readDone(); },
                                 name()));
        assert(!readDoneEvent.back().scheduled());
        dmaPort.dmaAction(MemCmd::WriteReq, start, size,
                          &readDoneEvent.back(), destination, 0);
        //yes, a writereq at a read device function is correct.
 
    } else {
        if (additional_action != NULL)
            assert(!additional_action->scheduled());
 
        dmaPort.dmaAction(MemCmd::WriteReq, start, size,
                          additional_action, destination, 0);
 
    }
 
}

 
void
UFSHostDevice::manageReadTransfer(uint32_t size, uint32_t LUN, uint64_t
                                  offset, uint32_t sg_table_length,
                                  struct UFSHCDSGEntry* sglist)
{
    uint32_t size_accum = 0;
 
    DPRINTF(UFSHostDevice, "Data READ size: %d\n", size);

    for (uint32_t count = 0; count < sg_table_length; count++) {
        struct transferInfo new_transfer;
        new_transfer.offset = sglist[count].upperAddr;
        new_transfer.offset = (new_transfer.offset << 32) |
            (sglist[count].baseAddr & 0xFFFFFFFF);
        new_transfer.filePointer = offset + size_accum;
        new_transfer.size = (sglist[count].size + 1);
        new_transfer.lunID = LUN;
 
        DPRINTF(UFSHostDevice, "Data READ start: 0x%8x; size: %d\n",
                new_transfer.offset, new_transfer.size);
 
        UFSDevice[LUN]->SSDReadInfo.push_back(new_transfer);
        UFSDevice[LUN]->SSDReadInfo.back().buffer.resize(sglist[count].size
                                                         + 1);

        UFSDevice[LUN]->readFlash(&UFSDevice[LUN]->
                                  SSDReadInfo.back().buffer[0],
                                  offset + size_accum,
                                  sglist[count].size + 1);
 
        size_accum += (sglist[count].size + 1);
 
        DPRINTF(UFSHostDevice, "Transfer %d; Remaining: 0x%8x, Accumulated:"
                " 0x%8x\n", (count + 1), (size-size_accum), size_accum);

        stats.totalReadSSD += (sglist[count].size + 1);
        stats.currentReadSSDQueue = UFSDevice[LUN]->SSDReadInfo.size();
        stats.averageReadSSDQueue = UFSDevice[LUN]->SSDReadInfo.size();
    }
 
    UFSDevice[LUN]->SSDReadStart(sg_table_length);

    ++stats.totalReadUFSTransactions;
 
}
 
 

 
void
UFSHostDevice::UFSSCSIDevice::SSDReadStart(uint32_t total_read)
{
    totalRead = total_read;
    for (uint32_t number_handled = 0; number_handled < SSDReadInfo.size();
         number_handled++) {
        flashDevice->readMemory(SSDReadInfo.front().filePointer,
                                SSDReadInfo.front().size, memReadCallback);
    }
 
}
 

 
void
UFSHostDevice::UFSSCSIDevice::SSDReadDone()
{
    DPRINTF(UFSHostDevice, "SSD read done at lun %d, Aiming for %d messages,"
            " %d so far\n", lunID, totalRead, amountOfReadTransfers);
 
    if (totalRead == amountOfReadTransfers) {
        totalRead = 0;
        amountOfReadTransfers = 0;

        setSignal();
        signalDone();
    }
 
}

void
UFSHostDevice::UFSSCSIDevice::readCallback()
{
    ++amountOfReadTransfers;

    setReadSignal();
    deviceReadCallback();
 
    //Are we done yet?
    SSDReadDone();
}

 
void
UFSHostDevice::readCallback()
{
    DPRINTF(UFSHostDevice, "Read Callback\n");
    uint8_t this_lun = 0;
 
    //while we haven't found the right lun, keep searching
    while ((this_lun < lunAvail) && !UFSDevice[this_lun]->finishedRead())
        ++this_lun;
 
    DPRINTF(UFSHostDevice, "Found LUN %d messages pending for clean: %d\n",
            this_lun, SSDReadPending.size());
 
    if (this_lun < lunAvail) {
        //Clear signal.
        UFSDevice[this_lun]->clearReadSignal();
        SSDReadPending.push_back(UFSDevice[this_lun]->SSDReadInfo.front());
        UFSDevice[this_lun]->SSDReadInfo.pop_front();
        readGarbageEventQueue.push_back(
            EventFunctionWrapper([this]{ readGarbage(); }, name()));
 
        //make sure the queue is popped a the end of the dma transaction
        readDevice(false, SSDReadPending.front().offset,
                   SSDReadPending.front().size,
                   &SSDReadPending.front().buffer[0], false,
                   &readGarbageEventQueue.back());

        ++stats.totalReadDiskTransactions;
    }
    else
        panic("no read finished in tick %d\n", curTick());
}

void
UFSHostDevice::readGarbage()
{
    DPRINTF(UFSHostDevice, "Clean read data, %d\n", SSDReadPending.size());
    SSDReadPending.pop_front();
    readGarbageEventQueue.pop_front();
}

 
void
UFSHostDevice::serialize(CheckpointOut &cp) const
{
    DmaDevice::serialize(cp);
 
    const uint8_t* temp_HCI_mem = reinterpret_cast<const uint8_t*>(&UFSHCIMem);
    SERIALIZE_ARRAY(temp_HCI_mem, sizeof(HCIMem));
 
    uint32_t lun_avail = lunAvail;
    SERIALIZE_SCALAR(lun_avail);
}
 

 
void
UFSHostDevice::unserialize(CheckpointIn &cp)
{
    DmaDevice::unserialize(cp);
    uint8_t* temp_HCI_mem = reinterpret_cast<uint8_t*>(&UFSHCIMem);
    UNSERIALIZE_ARRAY(temp_HCI_mem, sizeof(HCIMem));
 
    uint32_t lun_avail;
    UNSERIALIZE_SCALAR(lun_avail);
    assert(lunAvail == lun_avail);
}
 

 
DrainState
UFSHostDevice::drain()
{
    if (UFSHCIMem.TRUTRLDBR) {
        DPRINTF(UFSHostDevice, "UFSDevice is draining...\n");
        return DrainState::Draining;
    } else {
        DPRINTF(UFSHostDevice, "UFSDevice drained\n");
        return DrainState::Drained;
    }
}

 
void
UFSHostDevice::checkDrain()
{
    if (drainState() != DrainState::Draining)
        return;
 
    if (UFSHCIMem.TRUTRLDBR) {
        DPRINTF(UFSHostDevice, "UFSDevice is still draining; with %d active"
            " doorbells\n", activeDoorbells);
    } else {
        DPRINTF(UFSHostDevice, "UFSDevice is done draining\n");
        signalDrainDone();
    }
}
 
} // namespace gem5