src/dev/amdgpu/interrupt_handler.cc - public/gem5 - Git at Google

 /*
  * Copyright (c) 2021 Advanced Micro Devices, Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright notice,
  * this list of conditions and the following disclaimer.
  *
  * 2. 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.
  *
  * 3. Neither the name of the copyright holder 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 LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  *
  */

 #include "dev/amdgpu/interrupt_handler.hh"

 #include "debug/AMDGPUDevice.hh"
 #include "dev/amdgpu/ih_mmio.hh"
 #include "mem/packet_access.hh"

 // For generating interrupts, the object causing interrupt communicates with
 // the Interrupt Handler (IH), which submits a 256-bit Interrupt packet to the
 // system memory. The location where the IH submits the packet is the
 // IH Ring buffer in the system memory. The IH updates the Write Pointer
 // and the host consumes the ring buffer and once done, updates the Read
 // Pointer through the doorbell.

 // IH_RB_BaseAddr, IH_RB_WptrAddr (Lo/Hi), IH_RB_RptrAddr (Lo/Hi), etc. are
 // not GART addresses but system dma addresses and thus don't require
 // translations through the GART table.

 namespace gem5
 {

 AMDGPUInterruptHandler::AMDGPUInterruptHandler(
                                        const AMDGPUInterruptHandlerParams &p)
     : DmaDevice(p)
 {
     memset(&regs, 0, sizeof(AMDGPUIHRegs));
 }

 AddrRangeList
 AMDGPUInterruptHandler::getAddrRanges() const
 {
     AddrRangeList ranges;
     return ranges;
 }

 void
 AMDGPUInterruptHandler::intrPost()
 {
     if (gpuDevice)
         gpuDevice->intrPost();
 }

 void
 AMDGPUInterruptHandler::prepareInterruptCookie(ContextID cntxt_id,
                                                 uint32_t ring_id,
                                                 uint32_t client_id,
                                                 uint32_t source_id)
 {
     assert(client_id == SOC15_IH_CLIENTID_RLC ||
            client_id == SOC15_IH_CLIENTID_SDMA0 ||
            client_id == SOC15_IH_CLIENTID_SDMA1 ||
            client_id == SOC15_IH_CLIENTID_GRBM_CP);
     assert(source_id == CP_EOP || source_id == TRAP_ID);

     /**
      * Setup the fields in the interrupt cookie (see header file for more
      * detail on the fields). The timestamp here is a bogus value. It seems
      * the driver does not really care what this value is. Additionally the
      * model does not currently have anything to keep track of time. It is
      * possible that tick/cycle count can be used in the future if this ends
      * up being important. The remaining fields are passed from whichever
      * block is sending the interrupt.
      */
     AMDGPUInterruptCookie *cookie = new AMDGPUInterruptCookie();
     memset(cookie, 0, sizeof(AMDGPUInterruptCookie));

     // Currently only one process is supported and the first pasid from driver
     // is always 0x8000. In the future this can be obtained from the PM4
     // MAP_PROCESS packet and may need to be passed to this function.
     //
     // On a related note, leave vmid fields alone as they are only used for
     // memory exceptions. Memory exceptions are not supported on gfx900.
     cookie->pasid = 0x8000;
     cookie->timestamp_Lo = 0x40;
     cookie->clientId = client_id;
     cookie->sourceId = source_id;
     cookie->ringId = ring_id;
     cookie->source_data_dw1 = cntxt_id;
     interruptQueue.push(cookie);
 }

 void
 AMDGPUInterruptHandler::DmaEvent::process()
 {
     if (data == 1) {
         DPRINTF(AMDGPUDevice, "Completed interrupt cookie write\n");
         deviceIh->submitWritePointer();
     } else if (data == 2) {
         DPRINTF(AMDGPUDevice, "Completed interrupt write pointer update\n");
         deviceIh->intrPost();
     } else {
         fatal("Interrupt Handler DMA event returned bad value: %d\n", data);
     }
 }

 void
 AMDGPUInterruptHandler::submitWritePointer()
 {
     uint8_t *dataPtr = new uint8_t[sizeof(uint32_t)];
     regs.IH_Wptr += sizeof(AMDGPUInterruptCookie);
     Addr paddr = regs.WptrAddr;
     std::memcpy(dataPtr, &regs.IH_Wptr, sizeof(uint32_t));

     dmaEvent = new AMDGPUInterruptHandler::DmaEvent(this, 2);
     dmaWrite(paddr, sizeof(uint32_t), dmaEvent, dataPtr);
 }

 void
 AMDGPUInterruptHandler::submitInterruptCookie()
 {
     assert(!interruptQueue.empty());
     auto cookie = interruptQueue.front();
     size_t cookieSize = sizeof(AMDGPUInterruptCookie);

     uint8_t *dataPtr = new uint8_t[cookieSize];
     std::memcpy(dataPtr, cookie, cookieSize);
     Addr paddr = regs.baseAddr + regs.IH_Wptr;

     DPRINTF(AMDGPUDevice, "InterruptHandler rptr: 0x%x wptr: 0x%x\n",
                           regs.IH_Rptr, regs.IH_Wptr);
     dmaEvent = new AMDGPUInterruptHandler::DmaEvent(this, 1);
     dmaWrite(paddr, cookieSize, dmaEvent, dataPtr);

     interruptQueue.pop();
 }

 void
 AMDGPUInterruptHandler::writeMMIO(PacketPtr pkt, Addr mmio_offset)
 {
     switch (mmio_offset) {
       case mmIH_RB_CNTL:
         setCntl(pkt->getLE<uint32_t>());
         break;
       case mmIH_RB_BASE:
         setBase(pkt->getLE<uint32_t>());
         break;
       case mmIH_RB_BASE_HI:
         setBaseHi(pkt->getLE<uint32_t>());
         break;
       case mmIH_RB_RPTR:
         setRptr(pkt->getLE<uint32_t>());
         break;
       case mmIH_RB_WPTR:
         setWptr(pkt->getLE<uint32_t>());
         break;
       case mmIH_RB_WPTR_ADDR_LO:
         setWptrAddrLo(pkt->getLE<uint32_t>());
         break;
       case mmIH_RB_WPTR_ADDR_HI:
         setWptrAddrHi(pkt->getLE<uint32_t>());
         break;
       case mmIH_DOORBELL_RPTR:
         setDoorbellOffset(pkt->getLE<uint32_t>());
         if (bits(pkt->getLE<uint32_t>(), 28, 28)) {
             gpuDevice->setDoorbellType(getDoorbellOffset() << 2,
                                        InterruptHandler);
         }
         break;
       default:
         DPRINTF(AMDGPUDevice, "IH Unknown MMIO %#x\n", mmio_offset);
         break;
     }
 }

 void
 AMDGPUInterruptHandler::setCntl(const uint32_t &data)
 {
     regs.IH_Cntl = data;
 }

 void
 AMDGPUInterruptHandler::setBase(const uint32_t &data)
 {
     regs.IH_Base = data << 8;
     regs.baseAddr |= regs.IH_Base;
 }

 void
 AMDGPUInterruptHandler::setBaseHi(const uint32_t &data)
 {
     regs.IH_Base_Hi = data;
     regs.baseAddr |= ((uint64_t)regs.IH_Base_Hi) << 32;
 }

 void
 AMDGPUInterruptHandler::setRptr(const uint32_t &data)
 {
     regs.IH_Rptr = data;
 }

 void
 AMDGPUInterruptHandler::setWptr(const uint32_t &data)
 {
     regs.IH_Wptr = data;
 }

 void
 AMDGPUInterruptHandler::setWptrAddrLo(const uint32_t &data)
 {
     regs.IH_Wptr_Addr_Lo = data;
     regs.WptrAddr |= regs.IH_Wptr_Addr_Lo;
 }

 void
 AMDGPUInterruptHandler::setWptrAddrHi(const uint32_t &data)
 {
     regs.IH_Wptr_Addr_Hi = data;
     regs.WptrAddr |= ((uint64_t)regs.IH_Wptr_Addr_Hi) << 32;
 }

 void
 AMDGPUInterruptHandler::setDoorbellOffset(const uint32_t &data)
 {
     regs.IH_Doorbell = data & 0x3ffffff;
 }

 void
 AMDGPUInterruptHandler::updateRptr(const uint32_t &data)
 {
     regs.IH_Rptr = data; // update ring buffer rptr offset
 }

 void
 AMDGPUInterruptHandler::serialize(CheckpointOut &cp) const
 {
     uint32_t ih_cntl = regs.IH_Cntl;
     uint32_t ih_base = regs.IH_Base;
     uint32_t ih_base_hi = regs.IH_Base_Hi;
     Addr ih_baseAddr = regs.baseAddr;
     uint32_t ih_rptr = regs.IH_Rptr;
     uint32_t ih_wptr = regs.IH_Wptr;
     uint32_t ih_wptr_addr_lo = regs.IH_Wptr_Addr_Lo;
     uint32_t ih_wptr_addr_hi = regs.IH_Wptr_Addr_Hi;
     Addr ih_wptrAddr = regs.WptrAddr;
     uint32_t ih_doorbellOffset = regs.IH_Doorbell;

     SERIALIZE_SCALAR(ih_cntl);
     SERIALIZE_SCALAR(ih_base);
     SERIALIZE_SCALAR(ih_base_hi);
     SERIALIZE_SCALAR(ih_baseAddr);
     SERIALIZE_SCALAR(ih_rptr);
     SERIALIZE_SCALAR(ih_wptr);
     SERIALIZE_SCALAR(ih_wptr_addr_lo);
     SERIALIZE_SCALAR(ih_wptr_addr_hi);
     SERIALIZE_SCALAR(ih_wptrAddr);
     SERIALIZE_SCALAR(ih_doorbellOffset);
 }

 void
 AMDGPUInterruptHandler::unserialize(CheckpointIn &cp)
 {
     uint32_t ih_cntl;
     uint32_t ih_base;
     uint32_t ih_base_hi;
     Addr ih_baseAddr;
     uint32_t ih_rptr;
     uint32_t ih_wptr;
     uint32_t ih_wptr_addr_lo;
     uint32_t ih_wptr_addr_hi;
     Addr ih_wptrAddr;
     uint32_t ih_doorbellOffset;

     UNSERIALIZE_SCALAR(ih_cntl);
     UNSERIALIZE_SCALAR(ih_base);
     UNSERIALIZE_SCALAR(ih_base_hi);
     UNSERIALIZE_SCALAR(ih_baseAddr);
     UNSERIALIZE_SCALAR(ih_rptr);
     UNSERIALIZE_SCALAR(ih_wptr);
     UNSERIALIZE_SCALAR(ih_wptr_addr_lo);
     UNSERIALIZE_SCALAR(ih_wptr_addr_hi);
     UNSERIALIZE_SCALAR(ih_wptrAddr);
     UNSERIALIZE_SCALAR(ih_doorbellOffset);

     regs.IH_Cntl = ih_cntl;
     regs.IH_Base = ih_base;
     regs.IH_Base_Hi = ih_base_hi;
     regs.baseAddr = ih_baseAddr;
     regs.IH_Rptr = ih_rptr;
     regs.IH_Wptr = ih_wptr;
     regs.IH_Wptr_Addr_Lo = ih_wptr_addr_lo;
     regs.IH_Wptr_Addr_Hi = ih_wptr_addr_hi;
     regs.WptrAddr = ih_wptrAddr;
     regs.IH_Doorbell = ih_doorbellOffset;
 }

 } // namespace gem5
	/*
	* Copyright (c) 2021 Advanced Micro Devices, Inc.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* 1. Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	*
	* 2. 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.
	*
	* 3. Neither the name of the copyright holder 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 LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	* POSSIBILITY OF SUCH DAMAGE.
	*
	*/

	#include "dev/amdgpu/interrupt_handler.hh"

	#include "debug/AMDGPUDevice.hh"
	#include "dev/amdgpu/ih_mmio.hh"
	#include "mem/packet_access.hh"

	// For generating interrupts, the object causing interrupt communicates with
	// the Interrupt Handler (IH), which submits a 256-bit Interrupt packet to the
	// system memory. The location where the IH submits the packet is the
	// IH Ring buffer in the system memory. The IH updates the Write Pointer
	// and the host consumes the ring buffer and once done, updates the Read
	// Pointer through the doorbell.

	// IH_RB_BaseAddr, IH_RB_WptrAddr (Lo/Hi), IH_RB_RptrAddr (Lo/Hi), etc. are
	// not GART addresses but system dma addresses and thus don't require
	// translations through the GART table.

	namespace gem5
	{

	AMDGPUInterruptHandler::AMDGPUInterruptHandler(
	const AMDGPUInterruptHandlerParams &p)
	: DmaDevice(p)
	{
	memset(&regs, 0, sizeof(AMDGPUIHRegs));
	}

	AddrRangeList
	AMDGPUInterruptHandler::getAddrRanges() const
	{
	AddrRangeList ranges;
	return ranges;
	}

	void
	AMDGPUInterruptHandler::intrPost()
	{
	if (gpuDevice)
	gpuDevice->intrPost();
	}

	void
	AMDGPUInterruptHandler::prepareInterruptCookie(ContextID cntxt_id,
	uint32_t ring_id,
	uint32_t client_id,
	uint32_t source_id)
	{
	assert(client_id == SOC15_IH_CLIENTID_RLC \|\|
	client_id == SOC15_IH_CLIENTID_SDMA0 \|\|
	client_id == SOC15_IH_CLIENTID_SDMA1 \|\|
	client_id == SOC15_IH_CLIENTID_GRBM_CP);
	assert(source_id == CP_EOP \|\| source_id == TRAP_ID);

	/**
	* Setup the fields in the interrupt cookie (see header file for more
	* detail on the fields). The timestamp here is a bogus value. It seems
	* the driver does not really care what this value is. Additionally the
	* model does not currently have anything to keep track of time. It is
	* possible that tick/cycle count can be used in the future if this ends
	* up being important. The remaining fields are passed from whichever
	* block is sending the interrupt.
	*/
	AMDGPUInterruptCookie *cookie = new AMDGPUInterruptCookie();
	memset(cookie, 0, sizeof(AMDGPUInterruptCookie));

	// Currently only one process is supported and the first pasid from driver
	// is always 0x8000. In the future this can be obtained from the PM4
	// MAP_PROCESS packet and may need to be passed to this function.
	//
	// On a related note, leave vmid fields alone as they are only used for
	// memory exceptions. Memory exceptions are not supported on gfx900.
	cookie->pasid = 0x8000;
	cookie->timestamp_Lo = 0x40;
	cookie->clientId = client_id;
	cookie->sourceId = source_id;
	cookie->ringId = ring_id;
	cookie->source_data_dw1 = cntxt_id;
	interruptQueue.push(cookie);
	}

	void
	AMDGPUInterruptHandler::DmaEvent::process()
	{
	if (data == 1) {
	DPRINTF(AMDGPUDevice, "Completed interrupt cookie write\n");
	deviceIh->submitWritePointer();
	} else if (data == 2) {
	DPRINTF(AMDGPUDevice, "Completed interrupt write pointer update\n");
	deviceIh->intrPost();
	} else {
	fatal("Interrupt Handler DMA event returned bad value: %d\n", data);
	}
	}

	void
	AMDGPUInterruptHandler::submitWritePointer()
	{
	uint8_t *dataPtr = new uint8_t[sizeof(uint32_t)];
	regs.IH_Wptr += sizeof(AMDGPUInterruptCookie);
	Addr paddr = regs.WptrAddr;
	std::memcpy(dataPtr, &regs.IH_Wptr, sizeof(uint32_t));

	dmaEvent = new AMDGPUInterruptHandler::DmaEvent(this, 2);
	dmaWrite(paddr, sizeof(uint32_t), dmaEvent, dataPtr);
	}

	void
	AMDGPUInterruptHandler::submitInterruptCookie()
	{
	assert(!interruptQueue.empty());
	auto cookie = interruptQueue.front();
	size_t cookieSize = sizeof(AMDGPUInterruptCookie);

	uint8_t *dataPtr = new uint8_t[cookieSize];
	std::memcpy(dataPtr, cookie, cookieSize);
	Addr paddr = regs.baseAddr + regs.IH_Wptr;

	DPRINTF(AMDGPUDevice, "InterruptHandler rptr: 0x%x wptr: 0x%x\n",
	regs.IH_Rptr, regs.IH_Wptr);
	dmaEvent = new AMDGPUInterruptHandler::DmaEvent(this, 1);
	dmaWrite(paddr, cookieSize, dmaEvent, dataPtr);

	interruptQueue.pop();
	}

	void
	AMDGPUInterruptHandler::writeMMIO(PacketPtr pkt, Addr mmio_offset)
	{
	switch (mmio_offset) {
	case mmIH_RB_CNTL:
	setCntl(pkt->getLE<uint32_t>());
	break;
	case mmIH_RB_BASE:
	setBase(pkt->getLE<uint32_t>());
	break;
	case mmIH_RB_BASE_HI:
	setBaseHi(pkt->getLE<uint32_t>());
	break;
	case mmIH_RB_RPTR:
	setRptr(pkt->getLE<uint32_t>());
	break;
	case mmIH_RB_WPTR:
	setWptr(pkt->getLE<uint32_t>());
	break;
	case mmIH_RB_WPTR_ADDR_LO:
	setWptrAddrLo(pkt->getLE<uint32_t>());
	break;
	case mmIH_RB_WPTR_ADDR_HI:
	setWptrAddrHi(pkt->getLE<uint32_t>());
	break;
	case mmIH_DOORBELL_RPTR:
	setDoorbellOffset(pkt->getLE<uint32_t>());
	if (bits(pkt->getLE<uint32_t>(), 28, 28)) {
	gpuDevice->setDoorbellType(getDoorbellOffset() << 2,
	InterruptHandler);
	}
	break;
	default:
	DPRINTF(AMDGPUDevice, "IH Unknown MMIO %#x\n", mmio_offset);
	break;
	}
	}

	void
	AMDGPUInterruptHandler::setCntl(const uint32_t &data)
	{
	regs.IH_Cntl = data;
	}

	void
	AMDGPUInterruptHandler::setBase(const uint32_t &data)
	{
	regs.IH_Base = data << 8;
	regs.baseAddr \|= regs.IH_Base;
	}

	void
	AMDGPUInterruptHandler::setBaseHi(const uint32_t &data)
	{
	regs.IH_Base_Hi = data;
	regs.baseAddr \|= ((uint64_t)regs.IH_Base_Hi) << 32;
	}

	void
	AMDGPUInterruptHandler::setRptr(const uint32_t &data)
	{
	regs.IH_Rptr = data;
	}

	void
	AMDGPUInterruptHandler::setWptr(const uint32_t &data)
	{
	regs.IH_Wptr = data;
	}

	void
	AMDGPUInterruptHandler::setWptrAddrLo(const uint32_t &data)
	{
	regs.IH_Wptr_Addr_Lo = data;
	regs.WptrAddr \|= regs.IH_Wptr_Addr_Lo;
	}

	void
	AMDGPUInterruptHandler::setWptrAddrHi(const uint32_t &data)
	{
	regs.IH_Wptr_Addr_Hi = data;
	regs.WptrAddr \|= ((uint64_t)regs.IH_Wptr_Addr_Hi) << 32;
	}

	void
	AMDGPUInterruptHandler::setDoorbellOffset(const uint32_t &data)
	{
	regs.IH_Doorbell = data & 0x3ffffff;
	}

	void
	AMDGPUInterruptHandler::updateRptr(const uint32_t &data)
	{
	regs.IH_Rptr = data; // update ring buffer rptr offset
	}

	void
	AMDGPUInterruptHandler::serialize(CheckpointOut &cp) const
	{
	uint32_t ih_cntl = regs.IH_Cntl;
	uint32_t ih_base = regs.IH_Base;
	uint32_t ih_base_hi = regs.IH_Base_Hi;
	Addr ih_baseAddr = regs.baseAddr;
	uint32_t ih_rptr = regs.IH_Rptr;
	uint32_t ih_wptr = regs.IH_Wptr;
	uint32_t ih_wptr_addr_lo = regs.IH_Wptr_Addr_Lo;
	uint32_t ih_wptr_addr_hi = regs.IH_Wptr_Addr_Hi;
	Addr ih_wptrAddr = regs.WptrAddr;
	uint32_t ih_doorbellOffset = regs.IH_Doorbell;

	SERIALIZE_SCALAR(ih_cntl);
	SERIALIZE_SCALAR(ih_base);
	SERIALIZE_SCALAR(ih_base_hi);
	SERIALIZE_SCALAR(ih_baseAddr);
	SERIALIZE_SCALAR(ih_rptr);
	SERIALIZE_SCALAR(ih_wptr);
	SERIALIZE_SCALAR(ih_wptr_addr_lo);
	SERIALIZE_SCALAR(ih_wptr_addr_hi);
	SERIALIZE_SCALAR(ih_wptrAddr);
	SERIALIZE_SCALAR(ih_doorbellOffset);
	}

	void
	AMDGPUInterruptHandler::unserialize(CheckpointIn &cp)
	{
	uint32_t ih_cntl;
	uint32_t ih_base;
	uint32_t ih_base_hi;
	Addr ih_baseAddr;
	uint32_t ih_rptr;
	uint32_t ih_wptr;
	uint32_t ih_wptr_addr_lo;
	uint32_t ih_wptr_addr_hi;
	Addr ih_wptrAddr;
	uint32_t ih_doorbellOffset;

	UNSERIALIZE_SCALAR(ih_cntl);
	UNSERIALIZE_SCALAR(ih_base);
	UNSERIALIZE_SCALAR(ih_base_hi);
	UNSERIALIZE_SCALAR(ih_baseAddr);
	UNSERIALIZE_SCALAR(ih_rptr);
	UNSERIALIZE_SCALAR(ih_wptr);
	UNSERIALIZE_SCALAR(ih_wptr_addr_lo);
	UNSERIALIZE_SCALAR(ih_wptr_addr_hi);
	UNSERIALIZE_SCALAR(ih_wptrAddr);
	UNSERIALIZE_SCALAR(ih_doorbellOffset);

	regs.IH_Cntl = ih_cntl;
	regs.IH_Base = ih_base;
	regs.IH_Base_Hi = ih_base_hi;
	regs.baseAddr = ih_baseAddr;
	regs.IH_Rptr = ih_rptr;
	regs.IH_Wptr = ih_wptr;
	regs.IH_Wptr_Addr_Lo = ih_wptr_addr_lo;
	regs.IH_Wptr_Addr_Hi = ih_wptr_addr_hi;
	regs.WptrAddr = ih_wptrAddr;
	regs.IH_Doorbell = ih_doorbellOffset;
	}

	} // namespace gem5