oem/ibm/libpldmresponder/file_io.cpp - openbmc/pldm - Gitiles

 #include "config.h"

 #include "file_io.hpp"

 #include "file_io_by_type.hpp"
 #include "file_table.hpp"
 #include "libpldmresponder/utils.hpp"
 #include "registration.hpp"
 #include "xyz/openbmc_project/Common/error.hpp"

 #include <fcntl.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>

 #include <cstring>
 #include <fstream>
 #include <memory>
 #include <phosphor-logging/elog-errors.hpp>
 #include <phosphor-logging/log.hpp>

 #include "libpldm/base.h"

 namespace pldm
 {

 using namespace phosphor::logging;
 using namespace sdbusplus::xyz::openbmc_project::Common::Error;

 namespace responder
 {

 namespace oem_ibm
 {

 void registerHandlers()
 {
     registerHandler(PLDM_OEM, PLDM_GET_FILE_TABLE, std::move(getFileTable));
     registerHandler(PLDM_OEM, PLDM_READ_FILE_INTO_MEMORY,
                     std::move(readFileIntoMemory));
     registerHandler(PLDM_OEM, PLDM_WRITE_FILE_FROM_MEMORY,
                     std::move(writeFileFromMemory));
     registerHandler(PLDM_OEM, PLDM_READ_FILE, std::move(readFile));
     registerHandler(PLDM_OEM, PLDM_WRITE_FILE, std::move(writeFile));
     registerHandler(PLDM_OEM, PLDM_WRITE_FILE_BY_TYPE_FROM_MEMORY,
                     std::move(writeFileByTypeFromMemory));
     registerHandler(PLDM_OEM, PLDM_READ_FILE_BY_TYPE_INTO_MEMORY,
                     std::move(readFileByTypeIntoMemory));
 }

 } // namespace oem_ibm

 namespace fs = std::filesystem;
 using namespace phosphor::logging;

 namespace dma
 {

 /** @struct AspeedXdmaOp
  *
  * Structure representing XDMA operation
  */
 struct AspeedXdmaOp
 {
     uint64_t hostAddr; //!< the DMA address on the host side, configured by
                        //!< PCI subsystem.
     uint32_t len;      //!< the size of the transfer in bytes, it should be a
                        //!< multiple of 16 bytes
     uint32_t upstream; //!< boolean indicating the direction of the DMA
                        //!< operation, true means a transfer from BMC to host.
 };

 constexpr auto xdmaDev = "/dev/aspeed-xdma";

 int DMA::transferDataHost(const fs::path& path, uint32_t offset,
                           uint32_t length, uint64_t address, bool upstream)
 {
     static const size_t pageSize = getpagesize();
     uint32_t numPages = length / pageSize;
     uint32_t pageAlignedLength = numPages * pageSize;

     if (length > pageAlignedLength)
     {
         pageAlignedLength += pageSize;
     }

     auto mmapCleanup = [pageAlignedLength](void* vgaMem) {
         munmap(vgaMem, pageAlignedLength);
     };

     int fd = -1;
     int rc = 0;
     fd = open(xdmaDev, O_RDWR);
     if (fd < 0)
     {
         rc = -errno;
         log<level::ERR>("Failed to open the XDMA device", entry("RC=%d", rc));
         return rc;
     }

     utils::CustomFD xdmaFd(fd);

     void* vgaMem;
     vgaMem = mmap(nullptr, pageAlignedLength, upstream ? PROT_WRITE : PROT_READ,
                   MAP_SHARED, xdmaFd(), 0);
     if (MAP_FAILED == vgaMem)
     {
         rc = -errno;
         log<level::ERR>("Failed to mmap the XDMA device", entry("RC=%d", rc));
         return rc;
     }

     std::unique_ptr<void, decltype(mmapCleanup)> vgaMemPtr(vgaMem, mmapCleanup);

     if (upstream)
     {
         std::ifstream stream(path.string(), std::ios::in | std::ios::binary);
         stream.seekg(offset);

         // Writing to the VGA memory should be aligned at page boundary,
         // otherwise write data into a buffer aligned at page boundary and
         // then write to the VGA memory.
         std::vector<char> buffer{};
         buffer.resize(pageAlignedLength);
         stream.read(buffer.data(), length);
         memcpy(static_cast<char*>(vgaMemPtr.get()), buffer.data(),
                pageAlignedLength);

         if (static_cast<uint32_t>(stream.gcount()) != length)
         {
             log<level::ERR>("mismatch between number of characters to read and "
                             "the length read",
                             entry("LENGTH=%d", length),
                             entry("COUNT=%d", stream.gcount()));
             return -1;
         }
     }

     AspeedXdmaOp xdmaOp;
     xdmaOp.upstream = upstream ? 1 : 0;
     xdmaOp.hostAddr = address;
     xdmaOp.len = length;

     rc = write(xdmaFd(), &xdmaOp, sizeof(xdmaOp));
     if (rc < 0)
     {
         rc = -errno;
         log<level::ERR>("Failed to execute the DMA operation",
                         entry("RC=%d", rc), entry("UPSTREAM=%d", upstream),
                         entry("ADDRESS=%lld", address),
                         entry("LENGTH=%d", length));
         return rc;
     }

     if (!upstream)
     {
         std::ios_base::openmode mode = std::ios::out | std::ios::binary;
         if (fs::exists(path))
         {
             mode |= std::ios::in;
         }
         std::ofstream stream(path.string(), mode);

         stream.seekp(offset);
         stream.write(static_cast<const char*>(vgaMemPtr.get()), length);
     }

     return 0;
 }

 } // namespace dma

 Response readFileIntoMemory(const pldm_msg* request, size_t payloadLength)
 {
     uint32_t fileHandle = 0;
     uint32_t offset = 0;
     uint32_t length = 0;
     uint64_t address = 0;

     Response response((sizeof(pldm_msg_hdr) + PLDM_RW_FILE_MEM_RESP_BYTES), 0);
     auto responsePtr = reinterpret_cast<pldm_msg*>(response.data());

     if (payloadLength != PLDM_RW_FILE_MEM_REQ_BYTES)
     {
         encode_rw_file_memory_resp(request->hdr.instance_id,
                                    PLDM_READ_FILE_INTO_MEMORY,
                                    PLDM_ERROR_INVALID_LENGTH, 0, responsePtr);
         return response;
     }

     decode_rw_file_memory_req(request, payloadLength, &fileHandle, &offset,
                               &length, &address);

     using namespace pldm::filetable;
     auto& table = buildFileTable(FILE_TABLE_JSON);
     FileEntry value{};

     try
     {
         value = table.at(fileHandle);
     }
     catch (std::exception& e)
     {
         log<level::ERR>("File handle does not exist in the file table",
                         entry("HANDLE=%d", fileHandle));
         encode_rw_file_memory_resp(request->hdr.instance_id,
                                    PLDM_READ_FILE_INTO_MEMORY,
                                    PLDM_INVALID_FILE_HANDLE, 0, responsePtr);
         return response;
     }

     if (!fs::exists(value.fsPath))
     {
         log<level::ERR>("File does not exist", entry("HANDLE=%d", fileHandle));
         encode_rw_file_memory_resp(request->hdr.instance_id,
                                    PLDM_READ_FILE_INTO_MEMORY,
                                    PLDM_INVALID_FILE_HANDLE, 0, responsePtr);
         return response;
     }

     auto fileSize = fs::file_size(value.fsPath);
     if (offset >= fileSize)
     {
         log<level::ERR>("Offset exceeds file size", entry("OFFSET=%d", offset),
                         entry("FILE_SIZE=%d", fileSize));
         encode_rw_file_memory_resp(request->hdr.instance_id,
                                    PLDM_READ_FILE_INTO_MEMORY,
                                    PLDM_DATA_OUT_OF_RANGE, 0, responsePtr);
         return response;
     }

     if (offset + length > fileSize)
     {
         length = fileSize - offset;
     }

     if (length % dma::minSize)
     {
         log<level::ERR>("Read length is not a multiple of DMA minSize",
                         entry("LENGTH=%d", length));
         encode_rw_file_memory_resp(request->hdr.instance_id,
                                    PLDM_READ_FILE_INTO_MEMORY,
                                    PLDM_INVALID_READ_LENGTH, 0, responsePtr);
         return response;
     }

     using namespace dma;
     DMA intf;
     return transferAll<DMA>(&intf, PLDM_READ_FILE_INTO_MEMORY, value.fsPath,
                             offset, length, address, true,
                             request->hdr.instance_id);
 }

 Response writeFileFromMemory(const pldm_msg* request, size_t payloadLength)
 {
     uint32_t fileHandle = 0;
     uint32_t offset = 0;
     uint32_t length = 0;
     uint64_t address = 0;

     Response response(sizeof(pldm_msg_hdr) + PLDM_RW_FILE_MEM_RESP_BYTES, 0);
     auto responsePtr = reinterpret_cast<pldm_msg*>(response.data());

     if (payloadLength != PLDM_RW_FILE_MEM_REQ_BYTES)
     {
         encode_rw_file_memory_resp(request->hdr.instance_id,
                                    PLDM_WRITE_FILE_FROM_MEMORY,
                                    PLDM_ERROR_INVALID_LENGTH, 0, responsePtr);
         return response;
     }

     decode_rw_file_memory_req(request, payloadLength, &fileHandle, &offset,
                               &length, &address);

     if (length % dma::minSize)
     {
         log<level::ERR>("Write length is not a multiple of DMA minSize",
                         entry("LENGTH=%d", length));
         encode_rw_file_memory_resp(request->hdr.instance_id,
                                    PLDM_WRITE_FILE_FROM_MEMORY,
                                    PLDM_INVALID_WRITE_LENGTH, 0, responsePtr);
         return response;
     }

     using namespace pldm::filetable;
     auto& table = buildFileTable(FILE_TABLE_JSON);
     FileEntry value{};

     try
     {
         value = table.at(fileHandle);
     }
     catch (std::exception& e)
     {
         log<level::ERR>("File handle does not exist in the file table",
                         entry("HANDLE=%d", fileHandle));
         encode_rw_file_memory_resp(request->hdr.instance_id,
                                    PLDM_WRITE_FILE_FROM_MEMORY,
                                    PLDM_INVALID_FILE_HANDLE, 0, responsePtr);
         return response;
     }

     if (!fs::exists(value.fsPath))
     {
         log<level::ERR>("File does not exist", entry("HANDLE=%d", fileHandle));
         encode_rw_file_memory_resp(request->hdr.instance_id,
                                    PLDM_WRITE_FILE_FROM_MEMORY,
                                    PLDM_INVALID_FILE_HANDLE, 0, responsePtr);
         return response;
     }

     auto fileSize = fs::file_size(value.fsPath);
     if (offset >= fileSize)
     {
         log<level::ERR>("Offset exceeds file size", entry("OFFSET=%d", offset),
                         entry("FILE_SIZE=%d", fileSize));
         encode_rw_file_memory_resp(request->hdr.instance_id,
                                    PLDM_WRITE_FILE_FROM_MEMORY,
                                    PLDM_DATA_OUT_OF_RANGE, 0, responsePtr);
         return response;
     }

     using namespace dma;
     DMA intf;
     return transferAll<DMA>(&intf, PLDM_WRITE_FILE_FROM_MEMORY, value.fsPath,
                             offset, length, address, false,
                             request->hdr.instance_id);
 }

 Response getFileTable(const pldm_msg* request, size_t payloadLength)
 {
     uint32_t transferHandle = 0;
     uint8_t transferFlag = 0;
     uint8_t tableType = 0;

     Response response(sizeof(pldm_msg_hdr) +
                       PLDM_GET_FILE_TABLE_MIN_RESP_BYTES);
     auto responsePtr = reinterpret_cast<pldm_msg*>(response.data());

     if (payloadLength != PLDM_GET_FILE_TABLE_REQ_BYTES)
     {
         encode_get_file_table_resp(request->hdr.instance_id,
                                    PLDM_ERROR_INVALID_LENGTH, 0, 0, nullptr, 0,
                                    responsePtr);
         return response;
     }

     auto rc = decode_get_file_table_req(request, payloadLength, &transferHandle,
                                         &transferFlag, &tableType);
     if (rc)
     {
         encode_get_file_table_resp(request->hdr.instance_id, rc, 0, 0, nullptr,
                                    0, responsePtr);
         return response;
     }

     if (tableType != PLDM_FILE_ATTRIBUTE_TABLE)
     {
         encode_get_file_table_resp(request->hdr.instance_id,
                                    PLDM_INVALID_FILE_TABLE_TYPE, 0, 0, nullptr,
                                    0, responsePtr);
         return response;
     }

     using namespace pldm::filetable;
     auto table = buildFileTable(FILE_TABLE_JSON);
     auto attrTable = table();
     response.resize(response.size() + attrTable.size());
     responsePtr = reinterpret_cast<pldm_msg*>(response.data());

     if (attrTable.empty())
     {
         encode_get_file_table_resp(request->hdr.instance_id,
                                    PLDM_FILE_TABLE_UNAVAILABLE, 0, 0, nullptr,
                                    0, responsePtr);
         return response;
     }

     encode_get_file_table_resp(request->hdr.instance_id, PLDM_SUCCESS, 0,
                                PLDM_START_AND_END, attrTable.data(),
                                attrTable.size(), responsePtr);
     return response;
 }

 Response readFile(const pldm_msg* request, size_t payloadLength)
 {
     uint32_t fileHandle = 0;
     uint32_t offset = 0;
     uint32_t length = 0;

     Response response(sizeof(pldm_msg_hdr) + PLDM_READ_FILE_RESP_BYTES);
     auto responsePtr = reinterpret_cast<pldm_msg*>(response.data());

     if (payloadLength != PLDM_READ_FILE_REQ_BYTES)
     {
         encode_read_file_resp(request->hdr.instance_id,
                               PLDM_ERROR_INVALID_LENGTH, length, responsePtr);
         return response;
     }

     auto rc = decode_read_file_req(request, payloadLength, &fileHandle, &offset,
                                    &length);

     if (rc)
     {
         encode_read_file_resp(request->hdr.instance_id, rc, 0, responsePtr);
         return response;
     }

     using namespace pldm::filetable;
     auto& table = buildFileTable(FILE_TABLE_JSON);
     FileEntry value{};

     try
     {
         value = table.at(fileHandle);
     }
     catch (std::exception& e)
     {
         log<level::ERR>("File handle does not exist in the file table",
                         entry("HANDLE=%d", fileHandle));
         encode_read_file_resp(request->hdr.instance_id,
                               PLDM_INVALID_FILE_HANDLE, length, responsePtr);
         return response;
     }

     if (!fs::exists(value.fsPath))
     {
         log<level::ERR>("File does not exist", entry("HANDLE=%d", fileHandle));
         encode_read_file_resp(request->hdr.instance_id,
                               PLDM_INVALID_FILE_HANDLE, length, responsePtr);
         return response;
     }

     auto fileSize = fs::file_size(value.fsPath);
     if (offset >= fileSize)
     {
         log<level::ERR>("Offset exceeds file size", entry("OFFSET=%d", offset),
                         entry("FILE_SIZE=%d", fileSize));
         encode_read_file_resp(request->hdr.instance_id, PLDM_DATA_OUT_OF_RANGE,
                               length, responsePtr);
         return response;
     }

     if (offset + length > fileSize)
     {
         length = fileSize - offset;
     }

     response.resize(response.size() + length);
     responsePtr = reinterpret_cast<pldm_msg*>(response.data());
     auto fileDataPos = reinterpret_cast<char*>(responsePtr);
     fileDataPos += sizeof(pldm_msg_hdr) + sizeof(uint8_t) + sizeof(length);

     std::ifstream stream(value.fsPath, std::ios::in | std::ios::binary);
     stream.seekg(offset);
     stream.read(fileDataPos, length);

     encode_read_file_resp(request->hdr.instance_id, PLDM_SUCCESS, length,
                           responsePtr);

     return response;
 }

 Response writeFile(const pldm_msg* request, size_t payloadLength)
 {
     uint32_t fileHandle = 0;
     uint32_t offset = 0;
     uint32_t length = 0;
     size_t fileDataOffset = 0;

     Response response(sizeof(pldm_msg_hdr) + PLDM_WRITE_FILE_RESP_BYTES);
     auto responsePtr = reinterpret_cast<pldm_msg*>(response.data());

     if (payloadLength < PLDM_WRITE_FILE_REQ_BYTES)
     {
         encode_write_file_resp(request->hdr.instance_id,
                                PLDM_ERROR_INVALID_LENGTH, 0, responsePtr);
         return response;
     }

     auto rc = decode_write_file_req(request, payloadLength, &fileHandle,
                                     &offset, &length, &fileDataOffset);

     if (rc)
     {
         encode_write_file_resp(request->hdr.instance_id, rc, 0, responsePtr);
         return response;
     }

     using namespace pldm::filetable;
     auto& table = buildFileTable(FILE_TABLE_JSON);
     FileEntry value{};

     try
     {
         value = table.at(fileHandle);
     }
     catch (std::exception& e)
     {
         log<level::ERR>("File handle does not exist in the file table",
                         entry("HANDLE=%d", fileHandle));
         encode_write_file_resp(request->hdr.instance_id,
                                PLDM_INVALID_FILE_HANDLE, 0, responsePtr);
         return response;
     }

     if (!fs::exists(value.fsPath))
     {
         log<level::ERR>("File does not exist", entry("HANDLE=%d", fileHandle));
         encode_write_file_resp(request->hdr.instance_id,
                                PLDM_INVALID_FILE_HANDLE, 0, responsePtr);
         return response;
     }

     auto fileSize = fs::file_size(value.fsPath);
     if (offset >= fileSize)
     {
         log<level::ERR>("Offset exceeds file size", entry("OFFSET=%d", offset),
                         entry("FILE_SIZE=%d", fileSize));
         encode_write_file_resp(request->hdr.instance_id, PLDM_DATA_OUT_OF_RANGE,
                                0, responsePtr);
         return response;
     }

     auto fileDataPos =
         reinterpret_cast<const char*>(request->payload) + fileDataOffset;

     std::ofstream stream(value.fsPath,
                          std::ios::in | std::ios::out | std::ios::binary);
     stream.seekp(offset);
     stream.write(fileDataPos, length);

     encode_write_file_resp(request->hdr.instance_id, PLDM_SUCCESS, length,
                            responsePtr);

     return response;
 }

 Response rwFileByTypeIntoMemory(uint8_t cmd, const pldm_msg* request,
                                 size_t payloadLength)
 {
     Response response(
         sizeof(pldm_msg_hdr) + PLDM_RW_FILE_BY_TYPE_MEM_RESP_BYTES, 0);
     auto responsePtr = reinterpret_cast<pldm_msg*>(response.data());

     if (payloadLength != PLDM_RW_FILE_BY_TYPE_MEM_REQ_BYTES)
     {
         encode_rw_file_by_type_memory_resp(request->hdr.instance_id, cmd,
                                            PLDM_ERROR_INVALID_LENGTH, 0,
                                            responsePtr);
         return response;
     }

     uint16_t fileType{};
     uint32_t fileHandle{};
     uint32_t offset{};
     uint32_t length{};
     uint64_t address{};
     auto rc = decode_rw_file_by_type_memory_req(request, payloadLength,
                                                 &fileType, &fileHandle, &offset,
                                                 &length, &address);
     if (rc != PLDM_SUCCESS)
     {
         encode_rw_file_by_type_memory_resp(request->hdr.instance_id, cmd, rc, 0,
                                            responsePtr);
         return response;
     }
     if (length % dma::minSize)
     {
         log<level::ERR>("Length is not a multiple of DMA minSize",
                         entry("LENGTH=%d", length));
         encode_rw_file_by_type_memory_resp(request->hdr.instance_id, cmd,
                                            PLDM_INVALID_WRITE_LENGTH, 0,
                                            responsePtr);
         return response;
     }

     std::unique_ptr<FileHandler> handler{};
     try
     {
         handler = getHandlerByType(fileType, fileHandle);
     }
     catch (const InternalFailure& e)
     {
         log<level::ERR>("unknown file type ", entry("TYPE=%d", fileType));
         encode_rw_file_by_type_memory_resp(request->hdr.instance_id, cmd,
                                            PLDM_INVALID_FILE_TYPE, 0,
                                            responsePtr);
         return response;
     }

     rc = cmd == PLDM_WRITE_FILE_BY_TYPE_FROM_MEMORY
              ? handler->writeFromMemory(offset, length, address)
              : handler->readIntoMemory(offset, length, address);
     encode_rw_file_by_type_memory_resp(request->hdr.instance_id, cmd, rc,
                                        length, responsePtr);
     return response;
 }

 Response writeFileByTypeFromMemory(const pldm_msg* request,
                                    size_t payloadLength)
 {
     return rwFileByTypeIntoMemory(PLDM_WRITE_FILE_BY_TYPE_FROM_MEMORY, request,
                                   payloadLength);
 }

 Response readFileByTypeIntoMemory(const pldm_msg* request, size_t payloadLength)
 {
     return rwFileByTypeIntoMemory(PLDM_READ_FILE_BY_TYPE_INTO_MEMORY, request,
                                   payloadLength);
 }

 } // namespace responder
 } // namespace pldm
	#include "config.h"

	#include "file_io.hpp"

	#include "file_io_by_type.hpp"
	#include "file_table.hpp"
	#include "libpldmresponder/utils.hpp"
	#include "registration.hpp"
	#include "xyz/openbmc_project/Common/error.hpp"

	#include <fcntl.h>
	#include <sys/mman.h>
	#include <sys/stat.h>
	#include <sys/types.h>
	#include <unistd.h>

	#include <cstring>
	#include <fstream>
	#include <memory>
	#include <phosphor-logging/elog-errors.hpp>
	#include <phosphor-logging/log.hpp>

	#include "libpldm/base.h"

	namespace pldm
	{

	using namespace phosphor::logging;
	using namespace sdbusplus::xyz::openbmc_project::Common::Error;

	namespace responder
	{

	namespace oem_ibm
	{

	void registerHandlers()
	{
	registerHandler(PLDM_OEM, PLDM_GET_FILE_TABLE, std::move(getFileTable));
	registerHandler(PLDM_OEM, PLDM_READ_FILE_INTO_MEMORY,
	std::move(readFileIntoMemory));
	registerHandler(PLDM_OEM, PLDM_WRITE_FILE_FROM_MEMORY,
	std::move(writeFileFromMemory));
	registerHandler(PLDM_OEM, PLDM_READ_FILE, std::move(readFile));
	registerHandler(PLDM_OEM, PLDM_WRITE_FILE, std::move(writeFile));
	registerHandler(PLDM_OEM, PLDM_WRITE_FILE_BY_TYPE_FROM_MEMORY,
	std::move(writeFileByTypeFromMemory));
	registerHandler(PLDM_OEM, PLDM_READ_FILE_BY_TYPE_INTO_MEMORY,
	std::move(readFileByTypeIntoMemory));
	}

	} // namespace oem_ibm

	namespace fs = std::filesystem;
	using namespace phosphor::logging;

	namespace dma
	{

	/** @struct AspeedXdmaOp
	*
	* Structure representing XDMA operation
	*/
	struct AspeedXdmaOp
	{
	uint64_t hostAddr; //!< the DMA address on the host side, configured by
	//!< PCI subsystem.
	uint32_t len; //!< the size of the transfer in bytes, it should be a
	//!< multiple of 16 bytes
	uint32_t upstream; //!< boolean indicating the direction of the DMA
	//!< operation, true means a transfer from BMC to host.
	};

	constexpr auto xdmaDev = "/dev/aspeed-xdma";

	int DMA::transferDataHost(const fs::path& path, uint32_t offset,
	uint32_t length, uint64_t address, bool upstream)
	{
	static const size_t pageSize = getpagesize();
	uint32_t numPages = length / pageSize;
	uint32_t pageAlignedLength = numPages * pageSize;

	if (length > pageAlignedLength)
	{
	pageAlignedLength += pageSize;
	}

	auto mmapCleanup = [pageAlignedLength](void* vgaMem) {
	munmap(vgaMem, pageAlignedLength);
	};

	int fd = -1;
	int rc = 0;
	fd = open(xdmaDev, O_RDWR);
	if (fd < 0)
	{
	rc = -errno;
	log<level::ERR>("Failed to open the XDMA device", entry("RC=%d", rc));
	return rc;
	}

	utils::CustomFD xdmaFd(fd);

	void* vgaMem;
	vgaMem = mmap(nullptr, pageAlignedLength, upstream ? PROT_WRITE : PROT_READ,
	MAP_SHARED, xdmaFd(), 0);
	if (MAP_FAILED == vgaMem)
	{
	rc = -errno;
	log<level::ERR>("Failed to mmap the XDMA device", entry("RC=%d", rc));
	return rc;
	}

	std::unique_ptr<void, decltype(mmapCleanup)> vgaMemPtr(vgaMem, mmapCleanup);

	if (upstream)
	{
	std::ifstream stream(path.string(), std::ios::in \| std::ios::binary);
	stream.seekg(offset);

	// Writing to the VGA memory should be aligned at page boundary,
	// otherwise write data into a buffer aligned at page boundary and
	// then write to the VGA memory.
	std::vector<char> buffer{};
	buffer.resize(pageAlignedLength);
	stream.read(buffer.data(), length);
	memcpy(static_cast<char*>(vgaMemPtr.get()), buffer.data(),
	pageAlignedLength);

	if (static_cast<uint32_t>(stream.gcount()) != length)
	{
	log<level::ERR>("mismatch between number of characters to read and "
	"the length read",
	entry("LENGTH=%d", length),
	entry("COUNT=%d", stream.gcount()));
	return -1;
	}
	}

	AspeedXdmaOp xdmaOp;
	xdmaOp.upstream = upstream ? 1 : 0;
	xdmaOp.hostAddr = address;
	xdmaOp.len = length;

	rc = write(xdmaFd(), &xdmaOp, sizeof(xdmaOp));
	if (rc < 0)
	{
	rc = -errno;
	log<level::ERR>("Failed to execute the DMA operation",
	entry("RC=%d", rc), entry("UPSTREAM=%d", upstream),
	entry("ADDRESS=%lld", address),
	entry("LENGTH=%d", length));
	return rc;
	}

	if (!upstream)
	{
	std::ios_base::openmode mode = std::ios::out \| std::ios::binary;
	if (fs::exists(path))
	{
	mode \|= std::ios::in;
	}
	std::ofstream stream(path.string(), mode);

	stream.seekp(offset);
	stream.write(static_cast<const char*>(vgaMemPtr.get()), length);
	}

	return 0;
	}

	} // namespace dma

	Response readFileIntoMemory(const pldm_msg* request, size_t payloadLength)
	{
	uint32_t fileHandle = 0;
	uint32_t offset = 0;
	uint32_t length = 0;
	uint64_t address = 0;

	Response response((sizeof(pldm_msg_hdr) + PLDM_RW_FILE_MEM_RESP_BYTES), 0);
	auto responsePtr = reinterpret_cast<pldm_msg*>(response.data());

	if (payloadLength != PLDM_RW_FILE_MEM_REQ_BYTES)
	{
	encode_rw_file_memory_resp(request->hdr.instance_id,
	PLDM_READ_FILE_INTO_MEMORY,
	PLDM_ERROR_INVALID_LENGTH, 0, responsePtr);
	return response;
	}

	decode_rw_file_memory_req(request, payloadLength, &fileHandle, &offset,
	&length, &address);

	using namespace pldm::filetable;
	auto& table = buildFileTable(FILE_TABLE_JSON);
	FileEntry value{};

	try
	{
	value = table.at(fileHandle);
	}
	catch (std::exception& e)
	{
	log<level::ERR>("File handle does not exist in the file table",
	entry("HANDLE=%d", fileHandle));
	encode_rw_file_memory_resp(request->hdr.instance_id,
	PLDM_READ_FILE_INTO_MEMORY,
	PLDM_INVALID_FILE_HANDLE, 0, responsePtr);
	return response;
	}

	if (!fs::exists(value.fsPath))
	{
	log<level::ERR>("File does not exist", entry("HANDLE=%d", fileHandle));
	encode_rw_file_memory_resp(request->hdr.instance_id,
	PLDM_READ_FILE_INTO_MEMORY,
	PLDM_INVALID_FILE_HANDLE, 0, responsePtr);
	return response;
	}

	auto fileSize = fs::file_size(value.fsPath);
	if (offset >= fileSize)
	{
	log<level::ERR>("Offset exceeds file size", entry("OFFSET=%d", offset),
	entry("FILE_SIZE=%d", fileSize));
	encode_rw_file_memory_resp(request->hdr.instance_id,
	PLDM_READ_FILE_INTO_MEMORY,
	PLDM_DATA_OUT_OF_RANGE, 0, responsePtr);
	return response;
	}

	if (offset + length > fileSize)
	{
	length = fileSize - offset;
	}

	if (length % dma::minSize)
	{
	log<level::ERR>("Read length is not a multiple of DMA minSize",
	entry("LENGTH=%d", length));
	encode_rw_file_memory_resp(request->hdr.instance_id,
	PLDM_READ_FILE_INTO_MEMORY,
	PLDM_INVALID_READ_LENGTH, 0, responsePtr);
	return response;
	}

	using namespace dma;
	DMA intf;
	return transferAll<DMA>(&intf, PLDM_READ_FILE_INTO_MEMORY, value.fsPath,
	offset, length, address, true,
	request->hdr.instance_id);
	}

	Response writeFileFromMemory(const pldm_msg* request, size_t payloadLength)
	{
	uint32_t fileHandle = 0;
	uint32_t offset = 0;
	uint32_t length = 0;
	uint64_t address = 0;

	Response response(sizeof(pldm_msg_hdr) + PLDM_RW_FILE_MEM_RESP_BYTES, 0);
	auto responsePtr = reinterpret_cast<pldm_msg*>(response.data());

	if (payloadLength != PLDM_RW_FILE_MEM_REQ_BYTES)
	{
	encode_rw_file_memory_resp(request->hdr.instance_id,
	PLDM_WRITE_FILE_FROM_MEMORY,
	PLDM_ERROR_INVALID_LENGTH, 0, responsePtr);
	return response;
	}

	decode_rw_file_memory_req(request, payloadLength, &fileHandle, &offset,
	&length, &address);

	if (length % dma::minSize)
	{
	log<level::ERR>("Write length is not a multiple of DMA minSize",
	entry("LENGTH=%d", length));
	encode_rw_file_memory_resp(request->hdr.instance_id,
	PLDM_WRITE_FILE_FROM_MEMORY,
	PLDM_INVALID_WRITE_LENGTH, 0, responsePtr);
	return response;
	}

	using namespace pldm::filetable;
	auto& table = buildFileTable(FILE_TABLE_JSON);
	FileEntry value{};

	try
	{
	value = table.at(fileHandle);
	}
	catch (std::exception& e)
	{
	log<level::ERR>("File handle does not exist in the file table",
	entry("HANDLE=%d", fileHandle));
	encode_rw_file_memory_resp(request->hdr.instance_id,
	PLDM_WRITE_FILE_FROM_MEMORY,
	PLDM_INVALID_FILE_HANDLE, 0, responsePtr);
	return response;
	}

	if (!fs::exists(value.fsPath))
	{
	log<level::ERR>("File does not exist", entry("HANDLE=%d", fileHandle));
	encode_rw_file_memory_resp(request->hdr.instance_id,
	PLDM_WRITE_FILE_FROM_MEMORY,
	PLDM_INVALID_FILE_HANDLE, 0, responsePtr);
	return response;
	}

	auto fileSize = fs::file_size(value.fsPath);
	if (offset >= fileSize)
	{
	log<level::ERR>("Offset exceeds file size", entry("OFFSET=%d", offset),
	entry("FILE_SIZE=%d", fileSize));
	encode_rw_file_memory_resp(request->hdr.instance_id,
	PLDM_WRITE_FILE_FROM_MEMORY,
	PLDM_DATA_OUT_OF_RANGE, 0, responsePtr);
	return response;
	}

	using namespace dma;
	DMA intf;
	return transferAll<DMA>(&intf, PLDM_WRITE_FILE_FROM_MEMORY, value.fsPath,
	offset, length, address, false,
	request->hdr.instance_id);
	}

	Response getFileTable(const pldm_msg* request, size_t payloadLength)
	{
	uint32_t transferHandle = 0;
	uint8_t transferFlag = 0;
	uint8_t tableType = 0;

	Response response(sizeof(pldm_msg_hdr) +
	PLDM_GET_FILE_TABLE_MIN_RESP_BYTES);
	auto responsePtr = reinterpret_cast<pldm_msg*>(response.data());

	if (payloadLength != PLDM_GET_FILE_TABLE_REQ_BYTES)
	{
	encode_get_file_table_resp(request->hdr.instance_id,
	PLDM_ERROR_INVALID_LENGTH, 0, 0, nullptr, 0,
	responsePtr);
	return response;
	}

	auto rc = decode_get_file_table_req(request, payloadLength, &transferHandle,
	&transferFlag, &tableType);
	if (rc)
	{
	encode_get_file_table_resp(request->hdr.instance_id, rc, 0, 0, nullptr,
	0, responsePtr);
	return response;
	}

	if (tableType != PLDM_FILE_ATTRIBUTE_TABLE)
	{
	encode_get_file_table_resp(request->hdr.instance_id,
	PLDM_INVALID_FILE_TABLE_TYPE, 0, 0, nullptr,
	0, responsePtr);
	return response;
	}

	using namespace pldm::filetable;
	auto table = buildFileTable(FILE_TABLE_JSON);
	auto attrTable = table();
	response.resize(response.size() + attrTable.size());
	responsePtr = reinterpret_cast<pldm_msg*>(response.data());

	if (attrTable.empty())
	{
	encode_get_file_table_resp(request->hdr.instance_id,
	PLDM_FILE_TABLE_UNAVAILABLE, 0, 0, nullptr,
	0, responsePtr);
	return response;
	}

	encode_get_file_table_resp(request->hdr.instance_id, PLDM_SUCCESS, 0,
	PLDM_START_AND_END, attrTable.data(),
	attrTable.size(), responsePtr);
	return response;
	}

	Response readFile(const pldm_msg* request, size_t payloadLength)
	{
	uint32_t fileHandle = 0;
	uint32_t offset = 0;
	uint32_t length = 0;

	Response response(sizeof(pldm_msg_hdr) + PLDM_READ_FILE_RESP_BYTES);
	auto responsePtr = reinterpret_cast<pldm_msg*>(response.data());

	if (payloadLength != PLDM_READ_FILE_REQ_BYTES)
	{
	encode_read_file_resp(request->hdr.instance_id,
	PLDM_ERROR_INVALID_LENGTH, length, responsePtr);
	return response;
	}

	auto rc = decode_read_file_req(request, payloadLength, &fileHandle, &offset,
	&length);

	if (rc)
	{
	encode_read_file_resp(request->hdr.instance_id, rc, 0, responsePtr);
	return response;
	}

	using namespace pldm::filetable;
	auto& table = buildFileTable(FILE_TABLE_JSON);
	FileEntry value{};

	try
	{
	value = table.at(fileHandle);
	}
	catch (std::exception& e)
	{
	log<level::ERR>("File handle does not exist in the file table",
	entry("HANDLE=%d", fileHandle));
	encode_read_file_resp(request->hdr.instance_id,
	PLDM_INVALID_FILE_HANDLE, length, responsePtr);
	return response;
	}

	if (!fs::exists(value.fsPath))
	{
	log<level::ERR>("File does not exist", entry("HANDLE=%d", fileHandle));
	encode_read_file_resp(request->hdr.instance_id,
	PLDM_INVALID_FILE_HANDLE, length, responsePtr);
	return response;
	}

	auto fileSize = fs::file_size(value.fsPath);
	if (offset >= fileSize)
	{
	log<level::ERR>("Offset exceeds file size", entry("OFFSET=%d", offset),
	entry("FILE_SIZE=%d", fileSize));
	encode_read_file_resp(request->hdr.instance_id, PLDM_DATA_OUT_OF_RANGE,
	length, responsePtr);
	return response;
	}

	if (offset + length > fileSize)
	{
	length = fileSize - offset;
	}

	response.resize(response.size() + length);
	responsePtr = reinterpret_cast<pldm_msg*>(response.data());
	auto fileDataPos = reinterpret_cast<char*>(responsePtr);
	fileDataPos += sizeof(pldm_msg_hdr) + sizeof(uint8_t) + sizeof(length);

	std::ifstream stream(value.fsPath, std::ios::in \| std::ios::binary);
	stream.seekg(offset);
	stream.read(fileDataPos, length);

	encode_read_file_resp(request->hdr.instance_id, PLDM_SUCCESS, length,
	responsePtr);

	return response;
	}

	Response writeFile(const pldm_msg* request, size_t payloadLength)
	{
	uint32_t fileHandle = 0;
	uint32_t offset = 0;
	uint32_t length = 0;
	size_t fileDataOffset = 0;

	Response response(sizeof(pldm_msg_hdr) + PLDM_WRITE_FILE_RESP_BYTES);
	auto responsePtr = reinterpret_cast<pldm_msg*>(response.data());

	if (payloadLength < PLDM_WRITE_FILE_REQ_BYTES)
	{
	encode_write_file_resp(request->hdr.instance_id,
	PLDM_ERROR_INVALID_LENGTH, 0, responsePtr);
	return response;
	}

	auto rc = decode_write_file_req(request, payloadLength, &fileHandle,
	&offset, &length, &fileDataOffset);

	if (rc)
	{
	encode_write_file_resp(request->hdr.instance_id, rc, 0, responsePtr);
	return response;
	}

	using namespace pldm::filetable;
	auto& table = buildFileTable(FILE_TABLE_JSON);
	FileEntry value{};

	try
	{
	value = table.at(fileHandle);
	}
	catch (std::exception& e)
	{
	log<level::ERR>("File handle does not exist in the file table",
	entry("HANDLE=%d", fileHandle));
	encode_write_file_resp(request->hdr.instance_id,
	PLDM_INVALID_FILE_HANDLE, 0, responsePtr);
	return response;
	}

	if (!fs::exists(value.fsPath))
	{
	log<level::ERR>("File does not exist", entry("HANDLE=%d", fileHandle));
	encode_write_file_resp(request->hdr.instance_id,
	PLDM_INVALID_FILE_HANDLE, 0, responsePtr);
	return response;
	}

	auto fileSize = fs::file_size(value.fsPath);
	if (offset >= fileSize)
	{
	log<level::ERR>("Offset exceeds file size", entry("OFFSET=%d", offset),
	entry("FILE_SIZE=%d", fileSize));
	encode_write_file_resp(request->hdr.instance_id, PLDM_DATA_OUT_OF_RANGE,
	0, responsePtr);
	return response;
	}

	auto fileDataPos =
	reinterpret_cast<const char*>(request->payload) + fileDataOffset;

	std::ofstream stream(value.fsPath,
	std::ios::in \| std::ios::out \| std::ios::binary);
	stream.seekp(offset);
	stream.write(fileDataPos, length);

	encode_write_file_resp(request->hdr.instance_id, PLDM_SUCCESS, length,
	responsePtr);

	return response;
	}

	Response rwFileByTypeIntoMemory(uint8_t cmd, const pldm_msg* request,
	size_t payloadLength)
	{
	Response response(
	sizeof(pldm_msg_hdr) + PLDM_RW_FILE_BY_TYPE_MEM_RESP_BYTES, 0);
	auto responsePtr = reinterpret_cast<pldm_msg*>(response.data());

	if (payloadLength != PLDM_RW_FILE_BY_TYPE_MEM_REQ_BYTES)
	{
	encode_rw_file_by_type_memory_resp(request->hdr.instance_id, cmd,
	PLDM_ERROR_INVALID_LENGTH, 0,
	responsePtr);
	return response;
	}

	uint16_t fileType{};
	uint32_t fileHandle{};
	uint32_t offset{};
	uint32_t length{};
	uint64_t address{};
	auto rc = decode_rw_file_by_type_memory_req(request, payloadLength,
	&fileType, &fileHandle, &offset,
	&length, &address);
	if (rc != PLDM_SUCCESS)
	{
	encode_rw_file_by_type_memory_resp(request->hdr.instance_id, cmd, rc, 0,
	responsePtr);
	return response;
	}
	if (length % dma::minSize)
	{
	log<level::ERR>("Length is not a multiple of DMA minSize",
	entry("LENGTH=%d", length));
	encode_rw_file_by_type_memory_resp(request->hdr.instance_id, cmd,
	PLDM_INVALID_WRITE_LENGTH, 0,
	responsePtr);
	return response;
	}

	std::unique_ptr<FileHandler> handler{};
	try
	{
	handler = getHandlerByType(fileType, fileHandle);
	}
	catch (const InternalFailure& e)
	{
	log<level::ERR>("unknown file type ", entry("TYPE=%d", fileType));
	encode_rw_file_by_type_memory_resp(request->hdr.instance_id, cmd,
	PLDM_INVALID_FILE_TYPE, 0,
	responsePtr);
	return response;
	}

	rc = cmd == PLDM_WRITE_FILE_BY_TYPE_FROM_MEMORY
	? handler->writeFromMemory(offset, length, address)
	: handler->readIntoMemory(offset, length, address);
	encode_rw_file_by_type_memory_resp(request->hdr.instance_id, cmd, rc,
	length, responsePtr);
	return response;
	}

	Response writeFileByTypeFromMemory(const pldm_msg* request,
	size_t payloadLength)
	{
	return rwFileByTypeIntoMemory(PLDM_WRITE_FILE_BY_TYPE_FROM_MEMORY, request,
	payloadLength);
	}

	Response readFileByTypeIntoMemory(const pldm_msg* request, size_t payloadLength)
	{
	return rwFileByTypeIntoMemory(PLDM_READ_FILE_BY_TYPE_INTO_MEMORY, request,
	payloadLength);
	}

	} // namespace responder
	} // namespace pldm