RASCSI/cpp/controllers/abstract_controller.h
Uwe Seimet c98c52ffb8
Cleaned up dependencies on controller manager (#964)
* Cleaned up dependencies on controller manager

* Removed global fields

* Simplified setting up RascsiResponse and RascsiExecutor

* Got rid of remaining raw pointers

* Use references instead of pointers

* Improved encapsulation
2022-11-04 08:22:32 +01:00

134 lines
4.3 KiB
C++

//---------------------------------------------------------------------------
//
// SCSI Target Emulator RaSCSI Reloaded
// for Raspberry Pi
//
// Copyright (C) 2022 Uwe Seimet
//
// Base class for device controllers
//
//---------------------------------------------------------------------------
#pragma once
#include "scsi.h"
#include "hal/bus.h"
#include "phase_handler.h"
#include "controller_manager.h"
#include <unordered_set>
#include <unordered_map>
#include <vector>
#include <memory>
using namespace std;
class PrimaryDevice;
class AbstractController : public PhaseHandler, public enable_shared_from_this<AbstractController>
{
public:
enum class rascsi_shutdown_mode {
NONE,
STOP_RASCSI,
STOP_PI,
RESTART_PI
};
AbstractController(shared_ptr<ControllerManager> controller_manager, int target_id, int max_luns)
: controller_manager(controller_manager), target_id(target_id), max_luns(max_luns) {}
~AbstractController() override = default;
virtual void Error(scsi_defs::sense_key, scsi_defs::asc = scsi_defs::asc::NO_ADDITIONAL_SENSE_INFORMATION,
scsi_defs::status = scsi_defs::status::CHECK_CONDITION) = 0;
virtual void Reset();
virtual int GetInitiatorId() const = 0;
// Get requested LUN based on IDENTIFY message, with LUN from the CDB as fallback
virtual int GetEffectiveLun() const = 0;
virtual void ScheduleShutdown(rascsi_shutdown_mode) = 0;
int GetTargetId() const { return target_id; }
int GetMaxLuns() const { return max_luns; }
int GetLunCount() const { return static_cast<int>(luns.size()); }
unordered_set<shared_ptr<PrimaryDevice>> GetDevices() const;
shared_ptr<PrimaryDevice> GetDeviceForLun(int) const;
bool AddDevice(shared_ptr<PrimaryDevice>);
bool RemoveDevice(shared_ptr<PrimaryDevice>);
bool HasDeviceForLun(int) const;
int ExtractInitiatorId(int) const;
// TODO These should probably be extracted into a new TransferHandler class
void AllocateBuffer(size_t);
vector<uint8_t>& GetBuffer() { return ctrl.buffer; }
scsi_defs::status GetStatus() const { return ctrl.status; }
void SetStatus(scsi_defs::status s) { ctrl.status = s; }
uint32_t GetLength() const { return ctrl.length; }
void SetLength(uint32_t l) { ctrl.length = l; }
uint32_t GetBlocks() const { return ctrl.blocks; }
void SetBlocks(uint32_t b) { ctrl.blocks = b; }
void DecrementBlocks() { --ctrl.blocks; }
uint64_t GetNext() const { return ctrl.next; }
void SetNext(uint64_t n) { ctrl.next = n; }
void IncrementNext() { ++ctrl.next; }
int GetMessage() const { return ctrl.message; }
void SetMessage(int m) { ctrl.message = m; }
vector<int>& GetCmd() { return ctrl.cmd; }
int GetCmd(int index) const { return ctrl.cmd[index]; }
bool IsByteTransfer() const { return is_byte_transfer; }
void SetByteTransfer(bool);
uint32_t GetBytesToTransfer() const { return bytes_to_transfer; }
void SetBytesToTransfer(uint32_t b) { bytes_to_transfer = b; }
protected:
shared_ptr<ControllerManager> GetControllerManager() const { return controller_manager.lock(); }
inline BUS& GetBus() const { return controller_manager.lock()->GetBus(); }
scsi_defs::scsi_command GetOpcode() const { return static_cast<scsi_defs::scsi_command>(ctrl.cmd[0]); }
int GetLun() const { return (ctrl.cmd[1] >> 5) & 0x07; }
void ProcessPhase();
void AllocateCmd(size_t);
// TODO These should probably be extracted into a new TransferHandler class
bool HasValidLength() const { return ctrl.length != 0; }
int GetOffset() const { return ctrl.offset; }
void ResetOffset() { ctrl.offset = 0; }
void UpdateOffsetAndLength() { ctrl.offset += ctrl.length; ctrl.length = 0; }
private:
using ctrl_t = struct _ctrl_t {
// Command data, dynamically resized if required
vector<int> cmd = vector<int>(16);
scsi_defs::status status; // Status data
int message; // Message data
// Transfer
vector<uint8_t> buffer; // Transfer data buffer
uint32_t blocks; // Number of transfer blocks
uint64_t next; // Next record
uint32_t offset; // Transfer offset
uint32_t length; // Transfer remaining length
};
ctrl_t ctrl = {};
weak_ptr<ControllerManager> controller_manager;
// Logical units of this controller mapped to their LUN numbers
unordered_map<int, shared_ptr<PrimaryDevice>> luns;
int target_id;
int max_luns;
bool is_byte_transfer = false;
uint32_t bytes_to_transfer = 0;
};