bfgminer/driver-avalonmm.c

/*
 * Copyright 2014 Luke Dashjr
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 3 of the License, or (at your option)
 * any later version.  See COPYING for more details.
 */

#include "config.h"

#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <utlist.h>

#include "deviceapi.h"
#include "logging.h"
#include "lowlevel.h"
#include "lowl-vcom.h"
#include "miner.h"
#include "util.h"
#include "work2d.h"

#define AVALONMM_MAX_MODULES  4
#define AVALONMM_MAX_COINBASE_SIZE  (6 * 1024)
#define AVALONMM_MAX_MERKLES  20
#define AVALONMM_MAX_NONCE_DIFF  0x20

// Must be a power of two
#define AVALONMM_CACHED_JOBS  2

#define AVALONMM_NONCE_OFFSET  0x180

BFG_REGISTER_DRIVER(avalonmm_drv)

#define AVALONMM_PKT_DATA_SIZE  0x20
#define AVALONMM_PKT_SIZE  (AVALONMM_PKT_DATA_SIZE + 7)

enum avalonmm_cmd {
	AMC_DETECT     = 0x0a,
	AMC_NEW_JOB    = 0x0b,
	AMC_JOB_ID     = 0x0c,
	AMC_COINBASE   = 0x0d,
	AMC_MERKLES    = 0x0e,
	AMC_BLKHDR     = 0x0f,
	AMC_POLL       = 0x10,
	AMC_TARGET     = 0x11,
	AMC_START      = 0x13,
};

enum avalonmm_reply {
	AMR_NONCE      = 0x17,
	AMR_STATUS     = 0x18,
	AMR_DETECT_ACK = 0x19,
};

static
bool avalonmm_write_cmd(const int fd, const enum avalonmm_cmd cmd, const void *data, size_t datasz)
{
	uint8_t packets = ((datasz + AVALONMM_PKT_DATA_SIZE - 1) / AVALONMM_PKT_DATA_SIZE) ?: 1;
	uint8_t pkt[AVALONMM_PKT_SIZE] = {'A', 'V', cmd, 1, packets};
	uint16_t crc;
	ssize_t r;
	while (true)
	{
		size_t copysz = AVALONMM_PKT_DATA_SIZE;
		if (datasz < copysz)
		{
			copysz = datasz;
			memset(&pkt[5 + copysz], '\0', AVALONMM_PKT_DATA_SIZE - copysz);
		}
		if (copysz)
			memcpy(&pkt[5], data, copysz);
		crc = crc16xmodem(&pkt[5], AVALONMM_PKT_DATA_SIZE);
		pk_u16be(pkt, 5 + AVALONMM_PKT_DATA_SIZE, crc);
		r = write(fd, pkt, sizeof(pkt));
		if (opt_dev_protocol)
		{
			char hex[(sizeof(pkt) * 2) + 1];
			bin2hex(hex, pkt, sizeof(pkt));
			applog(LOG_DEBUG, "DEVPROTO fd=%d SEND: %s => %d", fd, hex, (int)r);
		}
		if (sizeof(pkt) != r)
			return false;
		datasz -= copysz;
		if (!datasz)
			break;
		data += copysz;
		++pkt[3];
	}
	return true;
}

static
ssize_t avalonmm_read(const int fd, const int logprio, enum avalonmm_reply *out_reply, void * const bufp, size_t bufsz)
{
	uint8_t *buf = bufp;
	uint8_t pkt[AVALONMM_PKT_SIZE];
	uint8_t packets = 0, got = 0;
	uint16_t good_crc, actual_crc;
	ssize_t r;
	while (true)
	{
		r = serial_read(fd, pkt, sizeof(pkt));
		if (opt_dev_protocol)
		{
			if (r >= 0)
			{
				char hex[(r * 2) + 1];
				bin2hex(hex, pkt, r);
				applog(LOG_DEBUG, "DEVPROTO fd=%d RECV: %s", fd, hex);
			}
			else
				applog(LOG_DEBUG, "DEVPROTO fd=%d RECV (%d)", fd, (int)r);
		}
		if (r != sizeof(pkt))
			return -1;
		if (memcmp(pkt, "AV", 2))
			applogr(-1, logprio, "%s: bad header", __func__);
		good_crc = crc16xmodem(&pkt[5], AVALONMM_PKT_DATA_SIZE);
		actual_crc = upk_u16le(pkt, 5 + AVALONMM_PKT_DATA_SIZE);
		if (good_crc != actual_crc)
			applogr(-1, logprio, "%s: bad CRC (good=%04x actual=%04x)", __func__, good_crc, actual_crc);
		*out_reply = pkt[2];
		if (!got)
		{
			if (pkt[3] != 1)
				applogr(-1, logprio, "%s: first packet is not index 1", __func__);
			++got;
			packets = pkt[4];
		}
		else
		{
			if (pkt[3] != ++got)
				applogr(-1, logprio, "%s: packet %d is not index %d", __func__, got, got);
			if (pkt[4] != packets)
				applogr(-1, logprio, "%s: packet %d total packet count is %d rather than original value of %d", __func__, got, pkt[4], packets);
		}
		if (bufsz)
		{
			if (likely(bufsz > AVALONMM_PKT_DATA_SIZE))
			{
				memcpy(buf, &pkt[5], AVALONMM_PKT_DATA_SIZE);
				bufsz -= AVALONMM_PKT_DATA_SIZE;
				buf += AVALONMM_PKT_DATA_SIZE;
			}
			else
			{
				memcpy(buf, &pkt[5], bufsz);
				bufsz = 0;
			}
		}
		if (got == packets)
			break;
	}
	return (((ssize_t)got) * AVALONMM_PKT_DATA_SIZE);
}

static
bool avalonmm_detect_one(const char * const devpath)
{
	uint8_t buf[AVALONMM_PKT_DATA_SIZE] = {0};
	enum avalonmm_reply reply;
	const int fd = serial_open(devpath, 0, 1, true);
	struct cgpu_info *prev_cgpu = NULL;
	if (fd == -1)
		applogr(false, LOG_DEBUG, "%s: Failed to open %s", __func__, devpath);
	
	for (int i = 0; i < AVALONMM_MAX_MODULES; ++i)
	{
		pk_u32be(buf, AVALONMM_PKT_DATA_SIZE - 4, i);
		avalonmm_write_cmd(fd, AMC_DETECT, buf, AVALONMM_PKT_DATA_SIZE);
	}
	
	while (avalonmm_read(fd, LOG_DEBUG, &reply, NULL, 0) > 0)
	{
		if (reply != AMR_DETECT_ACK)
			continue;
		
		int moduleno = upk_u32be(buf, AVALONMM_PKT_DATA_SIZE - 4);
		struct cgpu_info * const cgpu = malloc(sizeof(*cgpu));
		*cgpu = (struct cgpu_info){
			.drv = &avalonmm_drv,
			.device_path = prev_cgpu ? prev_cgpu->device_path : strdup(devpath),
			.device_data = (void*)(intptr_t)moduleno,
			.deven = DEV_ENABLED,
			.procs = 1,
			.threads = prev_cgpu ? 0 : 1,
		};
		
		add_cgpu_slave(cgpu, prev_cgpu);
		prev_cgpu = cgpu;
	}
	
	serial_close(fd);
	
	return prev_cgpu;
}

static
bool avalonmm_lowl_probe(const struct lowlevel_device_info * const info)
{
	return vcom_lowl_probe_wrapper(info, avalonmm_detect_one);
}

struct avalonmm_job {
	struct stratum_work swork;
	uint32_t jobid;
	struct timeval tv_prepared;
	double nonce_diff;
};

struct avalonmm_chain_state {
	uint32_t xnonce1;
	struct avalonmm_job *jobs[AVALONMM_CACHED_JOBS];
	uint32_t next_jobid;
};

struct avalonmm_module_state {
	unsigned module_id;
	uint16_t temp[2];
};

static
bool avalonmm_init(struct thr_info * const master_thr)
{
	struct cgpu_info * const master_dev = master_thr->cgpu, *dev = NULL;
	const char * const devpath = master_dev->device_path;
	const int fd = serial_open(devpath, 115200, 1, true);
	
	master_dev->device_fd = fd;
	if (unlikely(fd == -1))
		applogr(false, LOG_ERR, "%s: Failed to initialise", master_dev->dev_repr);
	
	struct avalonmm_chain_state * const chain = malloc(sizeof(*chain));
	*chain = (struct avalonmm_chain_state){
		.xnonce1 = 0,
	};
	
	work2d_init();
	if (!reserve_work2d_(&chain->xnonce1))
	{
		applog(LOG_ERR, "%s: Failed to reserve 2D work", master_dev->dev_repr);
		free(chain);
		serial_close(fd);
		return false;
	}
	
	for_each_managed_proc(proc, master_dev)
	{
		if (dev == proc->device)
			continue;
		dev = proc->device;
		
		struct thr_info * const thr = proc->thr[0];
		
		struct avalonmm_module_state * const module = malloc(sizeof(*module));
		*module = (struct avalonmm_module_state){
			.module_id = (intptr_t)dev->device_data,
		};
		
		proc->device_data = chain;
		thr->cgpu_data = module;
	}
	
	for_each_managed_proc(proc, master_dev)
	{
		proc->status = LIFE_INIT2;
	}
	
	return true;
}

static
bool avalonmm_send_swork(const int fd, struct avalonmm_chain_state * const chain, const struct stratum_work * const swork, uint32_t jobid, double *out_nonce_diff)
{
	uint8_t buf[AVALONMM_PKT_DATA_SIZE];
	bytes_t coinbase = BYTES_INIT;
	
	int coinbase_len = bytes_len(&swork->coinbase);
	if (coinbase_len > AVALONMM_MAX_COINBASE_SIZE)
		return false;
	
	if (swork->merkles > AVALONMM_MAX_MERKLES)
		return false;
	
	pk_u32be(buf,    0, coinbase_len);
	
	const size_t xnonce2_offset = swork->nonce2_offset + work2d_pad_xnonce_size(swork) + work2d_xnonce1sz;
	pk_u32be(buf,    4, xnonce2_offset);
	
	pk_u32be(buf,    8, 4);  // extranonce2 size, but only 4 is supported - smaller sizes are handled by limiting the range
	pk_u32be(buf, 0x0c, 0x24);  // merkle_offset, always 0x24 for Bitcoin
	pk_u32be(buf, 0x10, swork->merkles);
	pk_u32be(buf, 0x14, 1);  // diff? poorly defined
	pk_u32be(buf, 0x18, 0);  // pool number - none of its business
	if (!avalonmm_write_cmd(fd, AMC_NEW_JOB, buf, 0x1c))
		return false;
	
	double nonce_diff = target_diff(swork->target);
	if (nonce_diff >= AVALONMM_MAX_NONCE_DIFF)
		set_target_to_pdiff(buf, nonce_diff = AVALONMM_MAX_NONCE_DIFF);
	else
		memcpy(buf, swork->target, 0x20);
	*out_nonce_diff = nonce_diff;
	if (!avalonmm_write_cmd(fd, AMC_TARGET, buf, 0x20))
		return false;
	
	pk_u32be(buf, 0, jobid);
	if (!avalonmm_write_cmd(fd, AMC_JOB_ID, buf, 4))
		return false;
	
	// Need to add extranonce padding and extranonce2
	bytes_cpy(&coinbase, &swork->coinbase);
	uint8_t *cbp = bytes_buf(&coinbase);
	cbp += swork->nonce2_offset;
	work2d_pad_xnonce(cbp, swork, false);
	cbp += work2d_pad_xnonce_size(swork);
	memcpy(cbp, &chain->xnonce1, work2d_xnonce1sz);
	cbp += work2d_xnonce1sz;
	if (!avalonmm_write_cmd(fd, AMC_COINBASE, bytes_buf(&coinbase), bytes_len(&coinbase)))
		return false;
	
	if (!avalonmm_write_cmd(fd, AMC_MERKLES, bytes_buf(&swork->merkle_bin), bytes_len(&swork->merkle_bin)))
		return false;
	
	uint8_t header_bin[0x80];
	memcpy(&header_bin[   0], swork->header1, 0x24);
	memset(&header_bin[0x24], '\0', 0x20);  // merkle root
	pk_u32be(header_bin, 0x44, swork->ntime);
	memcpy(&header_bin[0x48], swork->diffbits, 4);
	memset(&header_bin[0x4c], '\0', 4);  // nonce
	memcpy(&header_bin[0x50], bfg_workpadding_bin, 0x30);
	if (!avalonmm_write_cmd(fd, AMC_BLKHDR, header_bin, sizeof(header_bin)))
		return false;
	
	// Avalon MM cannot handle xnonce2_size other than 4, and works in big endian, so we use a range to ensure the following bytes match
	const int fixed_mm_xnonce2_bytes = (work2d_xnonce2sz >= 4) ? 0 : (4 - work2d_xnonce2sz);
	uint8_t mm_xnonce2_start[4];
	uint32_t xnonce2_range;
	memset(mm_xnonce2_start, '\0', 4);
	cbp += work2d_xnonce2sz;
	for (int i = 1; i <= fixed_mm_xnonce2_bytes; ++i)
		mm_xnonce2_start[fixed_mm_xnonce2_bytes - i] = cbp++[0];
	if (fixed_mm_xnonce2_bytes > 0)
		xnonce2_range = (1 << (8 * work2d_xnonce2sz)) - 1;
	else
		xnonce2_range = 0xffffffff;
	
	pk_u32be(buf, 0, 80);  // fan speed %
	uint16_t voltcfg = ((uint16_t)bitflip8((0x78 - /*deci-milli-volts*/6625 / 125) << 1 | 1)) << 8;
	pk_u32be(buf, 4, voltcfg);
	pk_u32be(buf, 8, 450/*freq*/);
	memcpy(&buf[0xc], mm_xnonce2_start, 4);
	pk_u32be(buf, 0x10, xnonce2_range);
	if (!avalonmm_write_cmd(fd, AMC_START, buf, 0x14))
		return false;
	
	return true;
}

static
void avalonmm_free_job(struct avalonmm_job * const mmjob)
{
	stratum_work_clean(&mmjob->swork);
	free(mmjob);
}

static
bool avalonmm_update_swork_from_pool(struct cgpu_info * const master_dev, struct pool * const pool)
{
	struct avalonmm_chain_state * const chain = master_dev->device_data;
	const int fd = master_dev->device_fd;
	struct avalonmm_job *mmjob = malloc(sizeof(*mmjob));
	*mmjob = (struct avalonmm_job){
		.jobid = chain->next_jobid,
	};
	cg_rlock(&pool->data_lock);
	stratum_work_cpy(&mmjob->swork, &pool->swork);
	cg_runlock(&pool->data_lock);
	timer_set_now(&mmjob->tv_prepared);
	mmjob->swork.data_lock_p = NULL;
	if (!avalonmm_send_swork(fd, chain, &mmjob->swork, mmjob->jobid, &mmjob->nonce_diff))
	{
		avalonmm_free_job(mmjob);
		return false;
	}
	applog(LOG_DEBUG, "%s: Upload of job id %08lx complete", master_dev->dev_repr, (unsigned long)mmjob->jobid);
	++chain->next_jobid;
	
	struct avalonmm_job **jobentry = &chain->jobs[mmjob->jobid % AVALONMM_CACHED_JOBS];
	if (*jobentry)
		avalonmm_free_job(*jobentry);
	*jobentry = mmjob;
	
	return true;
}

static
struct cgpu_info *avalonmm_dev_for_module_id(struct cgpu_info * const master_dev, const uint32_t module_id)
{
	struct cgpu_info *dev = NULL;
	for_each_managed_proc(proc, master_dev)
	{
		if (dev == proc->device)
			continue;
		dev = proc->device;
		
		struct thr_info * const thr = dev->thr[0];
		struct avalonmm_module_state * const module = thr->cgpu_data;
		
		if (module->module_id == module_id)
			return dev;
	}
	return NULL;
}

static
bool avalonmm_poll_once(struct cgpu_info * const master_dev)
{
	struct avalonmm_chain_state * const chain = master_dev->device_data;
	const int fd = master_dev->device_fd;
	uint8_t buf[AVALONMM_PKT_DATA_SIZE];
	enum avalonmm_reply reply;
	
	if (avalonmm_read(fd, LOG_ERR, &reply, buf, sizeof(buf)) < 0)
		return false;
	
	switch (reply)
	{
		case AMR_STATUS:
		{
			const uint32_t module_id = upk_u32be(buf, AVALONMM_PKT_DATA_SIZE - 4);
			struct cgpu_info * const dev = avalonmm_dev_for_module_id(master_dev, module_id);
			
			if (unlikely(!dev))
			{
				struct thr_info * const master_thr = master_dev->thr[0];
				applog(LOG_ERR, "%s: %s for unknown module id %lu", master_dev->dev_repr, "Status", (unsigned long)module_id);
				inc_hw_errors_only(master_thr);
				break;
			}
			
			struct thr_info * const thr = dev->thr[0];
			struct avalonmm_module_state * const module = thr->cgpu_data;
			
			module->temp[0] = upk_u16be(buf,    0);
			module->temp[1] = upk_u16be(buf,    2);
#if 0
			module->fan [0] = upk_u16be(buf,    4);
			module->fan [1] = upk_u16be(buf,    6);
			module->freq    = upk_u32be(buf,    8);
			module->voltage = upk_u32be(buf, 0x0c);
#endif
			
			dev->temp = max(module->temp[0], module->temp[1]);
			
			break;
		}
		case AMR_NONCE:
		{
			const int fixed_mm_xnonce2_bytes = (work2d_xnonce2sz >= 4) ? 0 : (4 - work2d_xnonce2sz);
			const uint8_t * const backward_xnonce2 = &buf[8 + fixed_mm_xnonce2_bytes];
			const uint32_t nonce = upk_u32be(buf, 0x10) - AVALONMM_NONCE_OFFSET;
			const uint32_t jobid = upk_u32be(buf, 0x14);
			const uint32_t module_id = upk_u32be(buf, AVALONMM_PKT_DATA_SIZE - 4);
			struct cgpu_info * const dev = avalonmm_dev_for_module_id(master_dev, module_id);
			
			if (unlikely(!dev))
			{
				struct thr_info * const master_thr = master_dev->thr[0];
				applog(LOG_ERR, "%s: %s for unknown module id %lu", master_dev->dev_repr, "Nonce", (unsigned long)module_id);
				inc_hw_errors_only(master_thr);
				break;
			}
			
			struct thr_info * const thr = dev->thr[0];
			
			bool invalid_jobid = false;
			if (unlikely((uint32_t)(chain->next_jobid - AVALONMM_CACHED_JOBS) > chain->next_jobid))
				// Jobs wrap around
				invalid_jobid = (jobid < chain->next_jobid - AVALONMM_CACHED_JOBS && jobid >= chain->next_jobid);
			else
				invalid_jobid = (jobid < chain->next_jobid - AVALONMM_CACHED_JOBS || jobid >= chain->next_jobid);
			if (unlikely(invalid_jobid))
			{
				applog(LOG_ERR, "%s: Bad job id %08lx", dev->dev_repr, (unsigned long)jobid);
				inc_hw_errors_only(thr);
				break;
			}
			struct avalonmm_job * const mmjob = chain->jobs[jobid % AVALONMM_CACHED_JOBS];
			
			uint8_t xnonce2[work2d_xnonce2sz];
			for (int i = 0; i < work2d_xnonce2sz; ++i)
				xnonce2[i] = backward_xnonce2[(work2d_xnonce2sz - 1) - i];
			
			work2d_submit_nonce(thr, &mmjob->swork, &mmjob->tv_prepared, xnonce2, chain->xnonce1, nonce, mmjob->swork.ntime, NULL, mmjob->nonce_diff);
			break;
		}
	}
	
	return true;
}

static
void avalonmm_poll(struct cgpu_info * const master_dev, int n)
{
	while (n > 0)
	{
		if (avalonmm_poll_once(master_dev))
			--n;
	}
}

static
void avalonmm_minerloop(struct thr_info * const master_thr)
{
	struct cgpu_info * const master_dev = master_thr->cgpu;
	const int fd = master_dev->device_fd;
	struct pool *nextpool = current_pool(), *pool = NULL;
	uint8_t buf[AVALONMM_PKT_DATA_SIZE] = {0};
	
	while (likely(!master_dev->shutdown))
	{
		master_thr->work_restart = false;
		if (!pool_has_usable_swork(nextpool))
			; // FIXME
		else
		if (avalonmm_update_swork_from_pool(master_dev, nextpool))
			pool = nextpool;
		
		while (likely(!(master_thr->work_restart || ((nextpool = current_pool()) != pool && pool_has_usable_swork(nextpool)))))
		{
			cgsleep_ms(10);
			
			struct cgpu_info *dev = NULL;
			int n = 0;
			for_each_managed_proc(proc, master_dev)
			{
				if (dev == proc->device)
					continue;
				dev = proc->device;
				
				struct thr_info * const thr = dev->thr[0];
				struct avalonmm_module_state * const module = thr->cgpu_data;
				
				pk_u32be(buf, AVALONMM_PKT_DATA_SIZE - 4, module->module_id);
				avalonmm_write_cmd(fd, AMC_POLL, buf, AVALONMM_PKT_DATA_SIZE);
				++n;
			}
			avalonmm_poll(master_dev, n);
		}
	}
}

struct device_drv avalonmm_drv = {
	.dname = "avalonmm",
	.name = "AVM",
	
	.lowl_probe = avalonmm_lowl_probe,
	
	.thread_init = avalonmm_init,
	.minerloop = avalonmm_minerloop,
};