RASCSI/cpp/devices/primary_device.cpp
Uwe Seimet 1cae530d42
Added command byte count to SCSI command mapping (#966)
* Extended mapping table with command byte count

* Terminate early if command is unknown
2022-11-06 19:44:44 +01:00

319 lines
8.9 KiB
C++

//---------------------------------------------------------------------------
//
// SCSI Target Emulator RaSCSI Reloaded
// for Raspberry Pi
//
// Copyright (C) 2022 Uwe Seimet
//
//---------------------------------------------------------------------------
#include "log.h"
#include "rascsi_exceptions.h"
#include "scsi_command_util.h"
#include "primary_device.h"
using namespace std;
using namespace scsi_defs;
using namespace scsi_command_util;
bool PrimaryDevice::Init(const unordered_map<string, string>& params)
{
// Mandatory SCSI primary commands
AddCommand(scsi_command::eCmdTestUnitReady, [this] { TestUnitReady(); });
AddCommand(scsi_command::eCmdInquiry, [this] { Inquiry(); });
AddCommand(scsi_command::eCmdReportLuns, [this] { ReportLuns(); });
// Optional commands supported by all RaSCSI devices
AddCommand(scsi_command::eCmdRequestSense, [this] { RequestSense(); });
AddCommand(scsi_command::eCmdReserve6, [this] { ReserveUnit(); });
AddCommand(scsi_command::eCmdRelease6, [this] { ReleaseUnit(); });
AddCommand(scsi_command::eCmdSendDiagnostic, [this] { SendDiagnostic(); });
SetParams(params);
return true;
}
void PrimaryDevice::AddCommand(scsi_command opcode, const operation& execute)
{
commands[opcode] = execute;
}
void PrimaryDevice::Dispatch(scsi_command cmd)
{
if (const auto& it = commands.find(cmd); it != commands.end()) {
LOGDEBUG("Executing %s ($%02X)", command_mapping.find(cmd)->second.second, static_cast<int>(cmd))
it->second();
}
else {
LOGTRACE("ID %d LUN %d received unsupported command: $%02X", GetId(), GetLun(), static_cast<int>(cmd))
throw scsi_exception(sense_key::ILLEGAL_REQUEST, asc::INVALID_COMMAND_OPERATION_CODE);
}
}
void PrimaryDevice::Reset()
{
DiscardReservation();
Device::Reset();
}
int PrimaryDevice::GetId() const
{
if (GetController() == nullptr) {
LOGERROR("Device is missing its controller")
}
return GetController() != nullptr ? GetController()->GetTargetId() : -1;
}
void PrimaryDevice::SetController(shared_ptr<AbstractController> c)
{
controller = c;
}
void PrimaryDevice::TestUnitReady()
{
CheckReady();
EnterStatusPhase();
}
void PrimaryDevice::Inquiry()
{
// EVPD and page code check
if ((GetController()->GetCmd(1) & 0x01) || GetController()->GetCmd(2)) {
throw scsi_exception(sense_key::ILLEGAL_REQUEST, asc::INVALID_FIELD_IN_CDB);
}
vector<uint8_t> buf = InquiryInternal();
const size_t allocation_length = min(buf.size(), static_cast<size_t>(GetInt16(GetController()->GetCmd(), 3)));
memcpy(GetController()->GetBuffer().data(), buf.data(), allocation_length);
GetController()->SetLength(static_cast<uint32_t>(allocation_length));
// Report if the device does not support the requested LUN
if (int lun = GetController()->GetEffectiveLun(); !GetController()->HasDeviceForLun(lun)) {
LOGTRACE("Reporting LUN %d for device ID %d as not supported", lun, GetId())
// Signal that the requested LUN does not exist
GetController()->GetBuffer().data()[0] = 0x7f;
}
EnterDataInPhase();
}
void PrimaryDevice::ReportLuns()
{
// Only SELECT REPORT mode 0 is supported
if (GetController()->GetCmd(2)) {
throw scsi_exception(sense_key::ILLEGAL_REQUEST, asc::INVALID_FIELD_IN_CDB);
}
const uint32_t allocation_length = GetInt32(GetController()->GetCmd(), 6);
vector<uint8_t>& buf = GetController()->GetBuffer();
fill_n(buf.begin(), min(buf.size(), static_cast<size_t>(allocation_length)), 0);
uint32_t size = 0;
for (int lun = 0; lun < GetController()->GetMaxLuns(); lun++) {
if (GetController()->HasDeviceForLun(lun)) {
size += 8;
buf[size + 7] = (uint8_t)lun;
}
}
SetInt16(buf, 2, size);
size += 8;
GetController()->SetLength(min(allocation_length, size));
EnterDataInPhase();
}
void PrimaryDevice::RequestSense()
{
int lun = GetController()->GetEffectiveLun();
// Note: According to the SCSI specs the LUN handling for REQUEST SENSE non-existing LUNs do *not* result
// in CHECK CONDITION. Only the Sense Key and ASC are set in order to signal the non-existing LUN.
if (!GetController()->HasDeviceForLun(lun)) {
// LUN 0 can be assumed to be present (required to call RequestSense() below)
assert(GetController()->HasDeviceForLun(0));
lun = 0;
// Do not raise an exception here because the rest of the code must be executed
GetController()->Error(sense_key::ILLEGAL_REQUEST, asc::INVALID_LUN);
GetController()->SetStatus(status::GOOD);
}
vector<byte> buf = GetController()->GetDeviceForLun(lun)->HandleRequestSense();
const size_t allocation_length = min(buf.size(), static_cast<size_t>(GetController()->GetCmd(4)));
memcpy(GetController()->GetBuffer().data(), buf.data(), allocation_length);
GetController()->SetLength(static_cast<uint32_t>(allocation_length));
EnterDataInPhase();
}
void PrimaryDevice::SendDiagnostic()
{
// Do not support PF bit
if (GetController()->GetCmd(1) & 0x10) {
throw scsi_exception(sense_key::ILLEGAL_REQUEST, asc::INVALID_FIELD_IN_CDB);
}
// Do not support parameter list
if ((GetController()->GetCmd(3) != 0) || (GetController()->GetCmd(4) != 0)) {
throw scsi_exception(sense_key::ILLEGAL_REQUEST, asc::INVALID_FIELD_IN_CDB);
}
EnterStatusPhase();
}
void PrimaryDevice::CheckReady()
{
// Not ready if reset
if (IsReset()) {
SetReset(false);
LOGTRACE("%s Device in reset", __PRETTY_FUNCTION__)
throw scsi_exception(sense_key::UNIT_ATTENTION, asc::POWER_ON_OR_RESET);
}
// Not ready if it needs attention
if (IsAttn()) {
SetAttn(false);
LOGTRACE("%s Device in needs attention", __PRETTY_FUNCTION__)
throw scsi_exception(sense_key::UNIT_ATTENTION, asc::NOT_READY_TO_READY_CHANGE);
}
// Return status if not ready
if (!IsReady()) {
LOGTRACE("%s Device not ready", __PRETTY_FUNCTION__)
throw scsi_exception(sense_key::NOT_READY, asc::MEDIUM_NOT_PRESENT);
}
// Initialization with no error
LOGTRACE("%s Device is ready", __PRETTY_FUNCTION__)
}
vector<uint8_t> PrimaryDevice::HandleInquiry(device_type type, scsi_level level, bool is_removable) const
{
vector<uint8_t> buf(0x1F + 5);
// Basic data
// buf[0] ... SCSI device type
// buf[1] ... Bit 7: Removable/not removable
// buf[2] ... SCSI compliance level of command system
// buf[3] ... SCSI compliance level of Inquiry response
// buf[4] ... Inquiry additional data
buf[0] = static_cast<uint8_t>(type);
buf[1] = is_removable ? 0x80 : 0x00;
buf[2] = static_cast<uint8_t>(level);
buf[3] = level >= scsi_level::SCSI_2 ?
static_cast<uint8_t>(scsi_level::SCSI_2) : static_cast<uint8_t>(scsi_level::SCSI_1_CCS);
buf[4] = 0x1F;
// Padded vendor, product, revision
memcpy(&buf.data()[8], GetPaddedName().c_str(), 28);
return buf;
}
vector<byte> PrimaryDevice::HandleRequestSense() const
{
// Return not ready only if there are no errors
if (!GetStatusCode() && !IsReady()) {
throw scsi_exception(sense_key::NOT_READY, asc::MEDIUM_NOT_PRESENT);
}
// Set 18 bytes including extended sense data
vector<byte> buf(18);
// Current error
buf[0] = (byte)0x70;
buf[2] = (byte)(GetStatusCode() >> 16);
buf[7] = (byte)10;
buf[12] = (byte)(GetStatusCode() >> 8);
buf[13] = (byte)GetStatusCode();
LOGTRACE("%s Status $%02X, Sense Key $%02X, ASC $%02X",__PRETTY_FUNCTION__, static_cast<int>(GetController()->GetStatus()),
static_cast<int>(buf[2]), static_cast<int>(buf[12]))
return buf;
}
bool PrimaryDevice::WriteByteSequence(vector<uint8_t>&, uint32_t)
{
LOGERROR("%s Writing bytes is not supported by this device", __PRETTY_FUNCTION__)
return false;
}
void PrimaryDevice::ReserveUnit()
{
reserving_initiator = GetController()->GetInitiatorId();
if (reserving_initiator != -1) {
LOGTRACE("Reserved device ID %d, LUN %d for initiator ID %d", GetId(), GetLun(), reserving_initiator)
}
else {
LOGTRACE("Reserved device ID %d, LUN %d for unknown initiator", GetId(), GetLun())
}
EnterStatusPhase();
}
void PrimaryDevice::ReleaseUnit()
{
if (reserving_initiator != -1) {
LOGTRACE("Released device ID %d, LUN %d reserved by initiator ID %d", GetId(), GetLun(), reserving_initiator)
}
else {
LOGTRACE("Released device ID %d, LUN %d reserved by unknown initiator", GetId(), GetLun())
}
DiscardReservation();
EnterStatusPhase();
}
bool PrimaryDevice::CheckReservation(int initiator_id, scsi_command cmd, bool prevent_removal) const
{
if (reserving_initiator == NOT_RESERVED || reserving_initiator == initiator_id) {
return true;
}
// A reservation is valid for all commands except those excluded below
if (cmd == scsi_command::eCmdInquiry || cmd == scsi_command::eCmdRequestSense || cmd == scsi_command::eCmdRelease6) {
return true;
}
// PREVENT ALLOW MEDIUM REMOVAL is permitted if the prevent bit is 0
if (cmd == scsi_command::eCmdPreventAllowMediumRemoval && !prevent_removal) {
return true;
}
if (initiator_id != -1) {
LOGTRACE("Initiator ID %d tries to access reserved device ID %d, LUN %d", initiator_id, GetId(), GetLun())
}
else {
LOGTRACE("Unknown initiator tries to access reserved device ID %d, LUN %d", GetId(), GetLun())
}
return false;
}
void PrimaryDevice::DiscardReservation()
{
reserving_initiator = NOT_RESERVED;
}