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scsi_hd: fix write command.

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This commit is contained in:
Maxim Poliakovski 2022-11-07 21:56:01 +01:00
parent c87fc10376
commit b2ef809de1
4 changed files with 84 additions and 39 deletions
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33
devices/common/scsi/sc53c94.cpp
View File

@ -445,6 +445,7 @@ void Sc53C94::sequencer()
}
break;
case SeqState::SEND_MSG:
this->bus_obj->negotiate_xfer(this->data_fifo_pos, this->bytes_out);
this->bus_obj->push_data(this->target_id, this->data_fifo, this->bytes_out);
this->data_fifo_pos -= this->bytes_out;
if (this->data_fifo_pos > 0) {
@ -452,6 +453,7 @@ void Sc53C94::sequencer()
}
break;
case SeqState::SEND_CMD:
this->bus_obj->negotiate_xfer(this->data_fifo_pos, this->bytes_out);
this->bus_obj->push_data(this->target_id, this->data_fifo, this->data_fifo_pos);
this->data_fifo_pos = 0;
break;
@ -464,18 +466,17 @@ void Sc53C94::sequencer()
case SeqState::XFER_BEGIN:
this->cur_bus_phase = this->bus_obj->current_phase();
switch (this->cur_bus_phase) {
case ScsiPhase::COMMAND:
case ScsiPhase::DATA_OUT:
case ScsiPhase::MESSAGE_OUT:
if (this->cmd_fifo[0] & 0x80) {
this->cur_state = SeqState::SEND_DATA;
break;
}
this->bus_obj->push_data(this->target_id, this->data_fifo, this->data_fifo_pos);
this->data_fifo_pos = 0;
this->cur_state = SeqState::XFER_END;
this->cmd_steps++;
this->sequencer();
break;
case ScsiPhase::STATUS:
case ScsiPhase::DATA_IN:
case ScsiPhase::MESSAGE_IN:
this->bus_obj->negotiate_xfer(this->data_fifo_pos, this->bytes_out);
this->cur_state = SeqState::RCV_DATA;
this->rcv_data();
@ -493,6 +494,8 @@ void Sc53C94::sequencer()
this->update_irq();
exec_next_command();
break;
case SeqState::SEND_DATA:
break;
case SeqState::RCV_DATA:
// check for unexpected bus phase changes
if (this->bus_obj->current_phase() != this->cur_bus_phase) {
@ -607,7 +610,25 @@ void Sc53C94::real_dma_xfer(int direction)
bool is_done = false;
if (direction) {
ABORT_F("Sc53C94: real DMA transfers from host to target not implemented yet");
uint32_t got_bytes;
uint8_t* src_ptr;
while (this->xfer_count) {
this->dma_ch->pull_data(std::min((int)this->xfer_count, DATA_FIFO_MAX),
&got_bytes, &src_ptr);
std::memcpy(this->data_fifo, src_ptr, got_bytes);
this->data_fifo_pos = got_bytes;
this->bus_obj->push_data(this->target_id, this->data_fifo, this->data_fifo_pos);
this->xfer_count -= this->data_fifo_pos;
this->data_fifo_pos = 0;
if (!this->xfer_count) {
is_done = true;
this->status |= STAT_TC; // signal zero transfer count
this->cur_state = SeqState::XFER_END;
this->sequencer();
}
}
} else { // transfer data from target to host's memory
while (this->xfer_count) {
if (this->data_fifo_pos) {

12
devices/common/scsi/scsi.h
View File

@ -28,6 +28,7 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
#include <array>
#include <cinttypes>
#include <functional>
#include <string>
/** SCSI control signals.
@ -146,6 +147,8 @@ enum ScsiError : int {
class ScsiBus;
typedef std::function<void()> action_callback;
class ScsiDevice : public HWComponent {
public:
ScsiDevice(int my_id) {
@ -157,12 +160,13 @@ public:
virtual void notify(ScsiBus* bus_obj, ScsiMsg msg_type, int param);
virtual void next_step(ScsiBus* bus_obj);
virtual void prepare_xfer(ScsiBus* bus_obj, int& bytes_in, int& bytes_out);
virtual void switch_phase(const int new_phase);
virtual bool prepare_data() = 0;
virtual bool has_data() { return this->data_size != 0; };
virtual int send_data(uint8_t* dst_ptr, int count);
virtual int rcv_data(const uint8_t* src_ptr, const int count);
virtual bool prepare_data() = 0;
virtual void process_command() = 0;
protected:
@ -173,7 +177,13 @@ protected:
int cur_phase;
uint8_t* data_ptr = nullptr;
int data_size;
int incoming_size;
uint8_t status;
ScsiBus* bus_obj;
action_callback pre_xfer_action = nullptr;
action_callback post_xfer_action = nullptr;
};
/** This class provides a higher level abstraction for the SCSI bus. */

21
devices/common/scsi/scsi_hd.cpp
View File

@ -66,12 +66,17 @@ void ScsiHardDisk::process_command() {
uint8_t page_code = 0;
uint8_t subpage_code = 0;
this->pre_xfer_action = nullptr;
this->post_xfer_action = nullptr;
// assume successful command execution
this->status = ScsiStatus::GOOD;
uint8_t* cmd = this->cmd_buf;
LOG_F(INFO, "SCSI-HD: processing command 0x%X", cmd[0]);
if (cmd[0] != 8 && cmd[0] != 0xA && cmd[0] != 0x28 && cmd[0] != 0x2A) {
ABORT_F("SCSI-HD: untested command 0x%X", cmd[0]);
}
switch (cmd[0]) {
case ScsiCommand::TEST_UNIT_READY:
@ -107,6 +112,7 @@ void ScsiHardDisk::process_command() {
lba = (cmd[2] << 24) + (cmd[3] << 16) + (cmd[4] << 8) + cmd[5];
transfer_len = (cmd[7] << 8) + cmd[8];
write(lba, transfer_len, 10);
this->switch_phase(ScsiPhase::DATA_OUT);
break;
case ScsiCommand::SEEK_6:
lba = ((cmd[1] & 0x1F) << 16) + (cmd[2] << 8) + cmd[3];
@ -138,6 +144,10 @@ bool ScsiHardDisk::prepare_data() {
this->data_ptr = (uint8_t*)this->img_buffer;
this->data_size = this->cur_buf_cnt;
break;
case ScsiPhase::DATA_OUT:
this->data_ptr = (uint8_t*)this->img_buffer;
this->data_size = 0;
break;
case ScsiPhase::STATUS:
if (!error) {
this->img_buffer[0] = ScsiStatus::GOOD;
@ -242,6 +252,8 @@ void ScsiHardDisk::read(uint32_t lba, uint16_t transfer_len, uint8_t cmd_len) {
this->cur_buf_cnt = transfer_size;
this->msg_buf[0] = ScsiMessage::COMMAND_COMPLETE;
this->switch_phase(ScsiPhase::DATA_IN);
}
void ScsiHardDisk::write(uint32_t lba, uint16_t transfer_len, uint8_t cmd_len) {
@ -253,8 +265,13 @@ void ScsiHardDisk::write(uint32_t lba, uint16_t transfer_len, uint8_t cmd_len) {
transfer_size *= sector_size;
uint64_t device_offset = lba * sector_size;
this->incoming_size = transfer_size;
this->hdd_img.seekg(device_offset, this->hdd_img.beg);
this->hdd_img.write((char*)&img_buffer, transfer_size);
this->post_xfer_action = [this]() {
this->hdd_img.write(this->img_buffer, this->incoming_size);
};
}
void ScsiHardDisk::seek(uint32_t lba) {

57
devices/common/scsi/scsidevice.cpp
View File

@ -45,16 +45,13 @@ void ScsiDevice::notify(ScsiBus* bus_obj, ScsiMsg msg_type, int param)
bus_obj->assert_ctrl_line(this->scsi_id, SCSI_CTRL_BSY);
bus_obj->confirm_selection(this->scsi_id);
this->initiator_id = bus_obj->get_initiator_id();
this->bus_obj = bus_obj;
if (bus_obj->test_ctrl_lines(SCSI_CTRL_ATN)) {
this->cur_phase = ScsiPhase::MESSAGE_OUT;
bus_obj->switch_phase(this->scsi_id, ScsiPhase::MESSAGE_OUT);
this->switch_phase(ScsiPhase::MESSAGE_OUT);
LOG_F(INFO, "ScsiDevice: received message 0x%X", this->msg_buf[0]);
}
this->cur_phase = ScsiPhase::COMMAND;
bus_obj->switch_phase(this->scsi_id, ScsiPhase::COMMAND);
this->switch_phase(ScsiPhase::COMMAND);
this->process_command();
this->cur_phase = ScsiPhase::DATA_IN;
bus_obj->switch_phase(this->scsi_id, ScsiPhase::DATA_IN);
if (this->prepare_data()) {
bus_obj->assert_ctrl_line(this->scsi_id, SCSI_CTRL_REQ);
} else {
@ -67,31 +64,39 @@ void ScsiDevice::notify(ScsiBus* bus_obj, ScsiMsg msg_type, int param)
}
}
void ScsiDevice::switch_phase(const int new_phase)
{
this->cur_phase = new_phase;
this->bus_obj->switch_phase(this->scsi_id, this->cur_phase);
}
void ScsiDevice::next_step(ScsiBus* bus_obj)
{
switch (this->cur_phase) {
case ScsiPhase::COMMAND:
this->process_command();
bus_obj->switch_phase(this->scsi_id, ScsiPhase::DATA_IN);
this->cur_phase = ScsiPhase::DATA_IN;
this->switch_phase(ScsiPhase::DATA_IN);
break;
case ScsiPhase::DATA_OUT:
if (this->data_size >= this->incoming_size) {
if (this->post_xfer_action != nullptr) {
this->post_xfer_action();
}
this->switch_phase(ScsiPhase::STATUS);
}
break;
case ScsiPhase::DATA_IN:
if (!this->has_data()) {
this->cur_phase = ScsiPhase::STATUS;
bus_obj->switch_phase(this->scsi_id, ScsiPhase::STATUS);
this->switch_phase(ScsiPhase::STATUS);
}
break;
case ScsiPhase::STATUS:
this->cur_phase = ScsiPhase::MESSAGE_IN;
bus_obj->switch_phase(this->scsi_id, ScsiPhase::MESSAGE_IN);
this->switch_phase(ScsiPhase::MESSAGE_IN);
break;
case ScsiPhase::MESSAGE_IN:
this->cur_phase = ScsiPhase::BUS_FREE;
/* fall-through */
case ScsiPhase::BUS_FREE:
bus_obj->release_ctrl_lines(this->scsi_id);
bus_obj->switch_phase(this->scsi_id, ScsiPhase::BUS_FREE);
this->cur_phase = ScsiPhase::BUS_FREE;
this->switch_phase(ScsiPhase::BUS_FREE);
break;
default:
LOG_F(WARNING, "ScsiDevice: nothing to do for phase %d", this->cur_phase);
@ -115,6 +120,8 @@ void ScsiDevice::prepare_xfer(ScsiBus* bus_obj, int& bytes_in, int& bytes_out)
case ScsiPhase::DATA_IN:
bytes_out = this->data_size;
break;
case ScsiPhase::DATA_OUT:
break;
case ScsiPhase::MESSAGE_OUT:
this->data_ptr = this->msg_buf;
this->data_size = bytes_in;
@ -146,20 +153,10 @@ int ScsiDevice::send_data(uint8_t* dst_ptr, const int count)
int ScsiDevice::rcv_data(const uint8_t* src_ptr, const int count)
{
uint8_t* dst_ptr;
switch (this->cur_phase) {
case ScsiPhase::COMMAND:
dst_ptr = this->cmd_buf;
break;
case ScsiPhase::MESSAGE_OUT:
dst_ptr = this->msg_buf;
break;
default:
ABORT_F("ScsiDevice: invalid phase %d in rcv_data()", this->cur_phase);
}
std::memcpy(dst_ptr, src_ptr, count);
// accumulating incoming data in the pre-configured buffer
std::memcpy(this->data_ptr, src_ptr, count);
this->data_ptr += count;
this->data_size += count;
return count;
}