thodg/cgminer/driver-klondike.c

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• Hash : 595dcdfa
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  Date : 2013-10-04T14:56:33
  

  Klondike - increase circular read buffer size

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• driver-klondike.c

• /*
   * Copyright 2013 Andrew Smith
   * Copyright 2013 Con Kolivas
   * Copyright 2013 Chris Savery
   *
   * 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 <float.h>
  #include <limits.h>
  #include <pthread.h>
  #include <stdint.h>
  #include <stdio.h>
  #include <strings.h>
  #include <sys/time.h>
  #include <unistd.h>
  #include <math.h>
  
  #include "config.h"
  
  #ifdef WIN32
  #include <windows.h>
  #endif
  
  #include "compat.h"
  #include "miner.h"
  #include "usbutils.h"
  
  #define K1 "K1"
  #define K16 "K16"
  #define K64 "K64"
  
  #define MIDSTATE_BYTES 32
  #define MERKLE_OFFSET 64
  #define MERKLE_BYTES 12
  
  #define REPLY_SIZE		15	// adequate for all types of replies
  #define REPLY_BUFSIZE 		16	// reply + 1 byte to mark used
  #define MAX_REPLY_COUNT		4096	// more unhandled replies than this will result in data loss
  #define REPLY_WAIT_TIME		100 	// poll interval for a cmd waiting it's reply
  #define CMD_REPLY_RETRIES	8	// how many retries for cmds
  #define MAX_WORK_COUNT		4	// for now, must be binary multiple and match firmware
  #define TACH_FACTOR		87890	// fan rpm divisor
  
  struct device_drv klondike_drv;
  
  typedef struct klondike_id {
  	uint8_t version;
  	uint8_t product[7];
  	uint32_t serial;
  } IDENTITY;
  
  typedef struct klondike_status {
  	uint8_t state;
  	uint8_t chipcount;
  	uint8_t slavecount;
  	uint8_t workqc;
  	uint8_t workid;
  	uint8_t temp;
  	uint8_t fanspeed;
  	uint8_t errorcount;
  	uint16_t hashcount;
  	uint16_t maxcount;
  	uint8_t noise;
  } WORKSTATUS;
  
  typedef struct _worktask {
  	uint16_t pad1;
  	uint8_t pad2;
  	uint8_t workid;
  	uint32_t midstate[8];
  	uint32_t merkle[3];
  } WORKTASK;
  
  typedef struct _workresult {
  	uint16_t pad;
  	uint8_t device;
  	uint8_t workid;
  	uint32_t nonce;
  } WORKRESULT;
  
  typedef struct klondike_cfg {
  	uint16_t hashclock;
  	uint8_t temptarget;
  	uint8_t tempcritical;
  	uint8_t fantarget;
  	uint8_t pad;
  } WORKCFG;
  
  typedef struct device_info {
  	uint32_t noncecount;
  	uint32_t nextworkid;
  	uint16_t lasthashcount;
  	uint64_t totalhashcount;
  	uint32_t rangesize;
  	uint32_t *chipstats;
  } DEVINFO;
  
  struct klondike_info {
  	bool shutdown;
  	pthread_rwlock_t stat_lock;
  	struct thr_info replies_thr;
  	WORKSTATUS *status;
  	DEVINFO *devinfo;
  	WORKCFG *cfg;
  	char *replies;
  	int nextreply;
  	int noncecount;
  	uint64_t hashcount;
  	uint64_t errorcount;
  	uint64_t noisecount;
  };
  
  IDENTITY KlondikeID;
  
  static double cvtKlnToC(uint8_t temp)
  {
  	double Rt, stein, celsius;
  
  	if (temp == 0)
  		return 0.0;
  
  	Rt = 1000.0 * 255.0 / (double)temp - 1000.0;
  
  	stein = log(Rt / 2200.0) / 3987.0;
  
  	stein += 1.0 / (double)(25.0 + 273.15);
  
  	celsius = (1.0 / stein) - 273.15;
  
  	// For display of bad data
  	if (celsius < 0.0)
  		celsius = 0.0;
  	if (celsius > 200.0)
  		celsius = 200.0;
  
  	return celsius;
  }
  
  static int cvtCToKln(double deg)
  {
  	double Rt, stein, temp;
  
  	if (deg < 0.0)
  		deg = 0.0;
  
  	stein = 1.0 / (deg + 273.15);
  
  	stein -= 1.0 / (double)(25.0 + 273.15);
  
  	Rt = exp(stein * 3987.0) * 2200.0;
  
  	if (Rt == -1000.0)
  		Rt++;
  
  	temp = 1000.0 * 256.0 / (Rt + 1000.0);
  
  	if (temp > 255)
  		temp = 255;
  	if (temp < 0)
  		temp = 0;
  
  	return (int)temp;
  }
  
  static char *SendCmdGetReply(struct cgpu_info *klncgpu, char Cmd, int device, int datalen, void *data)
  {
  	struct klondike_info *klninfo = (struct klondike_info *)(klncgpu->device_data);
  	char outbuf[64];
  	int retries = CMD_REPLY_RETRIES;
  	int chkreply = klninfo->nextreply;
  	int sent, err;
  
  	if (klncgpu->usbinfo.nodev)
  		return NULL;
  
  	outbuf[0] = Cmd;
  	outbuf[1] = device;
  	memcpy(outbuf+2, data, datalen);
  	err = usb_write(klncgpu, outbuf, 2+datalen, &sent, C_REQUESTRESULTS);
  	if (err < 0 || sent != 2+datalen) {
  		applog(LOG_ERR, "%s (%s) Cmd:%c Dev:%d, write failed (%d:%d)", klncgpu->drv->dname, klncgpu->device_path, Cmd, device, sent, err);
  	}
  	while (retries-- > 0 && klninfo->shutdown == false) {
  		cgsleep_ms(REPLY_WAIT_TIME);
  		while (*(klninfo->replies + chkreply*REPLY_BUFSIZE) != Cmd || *(klninfo->replies + chkreply*REPLY_BUFSIZE + 2) != device) {
  			if (++chkreply == MAX_REPLY_COUNT)
  				chkreply = 0;
  			if (chkreply == klninfo->nextreply)
  				break;
  		}
  		if (chkreply == klninfo->nextreply)
  			continue;
  		*(klninfo->replies + chkreply*REPLY_BUFSIZE) = '!';  // mark to prevent re-use
  		return klninfo->replies + chkreply*REPLY_BUFSIZE + 1;
  	}
  	return NULL;
  }
  
  static bool klondike_get_stats(struct cgpu_info *klncgpu)
  {
  	struct klondike_info *klninfo = (struct klondike_info *)(klncgpu->device_data);
  	int slaves, dev;
  
  	if (klncgpu->usbinfo.nodev || klninfo->status == NULL)
  		return false;
  
  	applog(LOG_DEBUG, "Klondike getting status");
  	slaves = klninfo->status[0].slavecount;
  
  	// loop thru devices and get status for each
  	wr_lock(&(klninfo->stat_lock));
  	for (dev = 0; dev <= slaves; dev++) {
  		char *reply = SendCmdGetReply(klncgpu, 'S', dev, 0, NULL);
  		if (reply != NULL)
  			memcpy((void *)(&(klninfo->status[dev])), reply+2, sizeof(klninfo->status[dev]));
  	}
  	wr_unlock(&(klninfo->stat_lock));
  
  	// todo: detect slavecount change and realloc space
  
  	return true;
  }
  
  static bool klondike_init(struct cgpu_info *klncgpu)
  {
  	struct klondike_info *klninfo = (struct klondike_info *)(klncgpu->device_data);
  	int slaves, dev;
  
  	char *reply = SendCmdGetReply(klncgpu, 'S', 0, 0, NULL);
  	if (reply == NULL)
  		return false;
  
  	slaves = ((WORKSTATUS *)(reply+2))->slavecount;
  	if (klninfo->status == NULL) {
  		applog(LOG_DEBUG, "Klondike initializing data");
  
  		// alloc space for status, devinfo and cfg for master and slaves
  		klninfo->status = calloc(slaves+1, sizeof(WORKSTATUS));
  		if (unlikely(!klninfo->status))
  			quit(1, "Failed to calloc status array in klondke_get_stats");
  		klninfo->devinfo = calloc(slaves+1, sizeof(DEVINFO));
  		if (unlikely(!klninfo->devinfo))
  			quit(1, "Failed to calloc devinfo array in klondke_get_stats");
  		klninfo->cfg = calloc(slaves+1, sizeof(WORKCFG));
  		if (unlikely(!klninfo->cfg))
  			quit(1, "Failed to calloc cfg array in klondke_get_stats");
  	}
  
  	WORKCFG cfgset = { 0,0,0,0,0 }; // zero init triggers read back only
  	double temp1, temp2;
  	int size = 2;
  
  	if (opt_klondike_options != NULL) {  // boundaries are checked by device, with valid values returned
  		sscanf(opt_klondike_options, "%hu:%lf:%lf:%hhu", &cfgset.hashclock, &temp1, &temp2, &cfgset.fantarget);
  		cfgset.temptarget = cvtCToKln(temp1);
  		cfgset.tempcritical = cvtCToKln(temp2);
  		cfgset.fantarget = (int)255*cfgset.fantarget/100;
  		size = sizeof(cfgset);
  	}
  
  	for (dev = 0; dev <= slaves; dev++) {
  		char *reply = SendCmdGetReply(klncgpu, 'C', dev, size, &cfgset);
  		if (reply != NULL) {
  			klninfo->cfg[dev] = *(WORKCFG *)(reply+2);
  			applog(LOG_NOTICE, "Klondike config (%d: Clk: %d, T:%.0lf, C:%.0lf, F:%d)",
  				dev, klninfo->cfg[dev].hashclock,
  				cvtKlnToC(klninfo->cfg[dev].temptarget),
  				cvtKlnToC(klninfo->cfg[dev].tempcritical),
  				(int)100*klninfo->cfg[dev].fantarget/256);
  		}
  	}
  	klondike_get_stats(klncgpu);
  	for (dev = 0; dev <= slaves; dev++) {
  		klninfo->devinfo[dev].rangesize = ((uint64_t)1<<32) / klninfo->status[dev].chipcount;
  		klninfo->devinfo[dev].chipstats = calloc(klninfo->status[dev].chipcount*2 , sizeof(uint32_t));
  	}
  
  	SendCmdGetReply(klncgpu, 'E', 0, 1, "1");
  
  	return true;
  }
  
  static bool klondike_detect_one(struct libusb_device *dev, struct usb_find_devices *found)
  {
  	struct cgpu_info *klncgpu = usb_alloc_cgpu(&klondike_drv, 1);
  	struct klondike_info *klninfo = NULL;
  
  	if (unlikely(!klncgpu))
  		quit(1, "Failed to calloc klncgpu in klondike_detect_one");
  
  	klninfo = calloc(1, sizeof(*klninfo));
  	if (unlikely(!klninfo))
  		quit(1, "Failed to calloc klninfo in klondke_detect_one");
  	klncgpu->device_data = (FILE *)klninfo;
  
  	klninfo->replies = calloc(MAX_REPLY_COUNT, REPLY_BUFSIZE);
  	if (unlikely(!klninfo->replies))
  		quit(1, "Failed to calloc replies buffer in klondke_detect_one");
  	klninfo->nextreply = 0;
  
  	if (usb_init(klncgpu, dev, found)) {
  		int attempts = 0;
  		while (attempts++ < 3) {
  			char devpath[20], reply[REPLY_SIZE];
  			int sent, recd, err;
  
  			sprintf(devpath, "%d:%d", (int)(klncgpu->usbinfo.bus_number), (int)(klncgpu->usbinfo.device_address));
  			err = usb_write(klncgpu, "I", 2, &sent, C_REQUESTRESULTS);
  			if (err < 0 || sent != 2) {
  				applog(LOG_ERR, "%s (%s) detect write failed (%d:%d)", klncgpu->drv->dname, devpath, sent, err);
  			}
  			cgsleep_ms(REPLY_WAIT_TIME*10);
  			err = usb_read(klncgpu, reply, REPLY_SIZE, &recd, C_GETRESULTS);
  			if (err < 0) {
  				applog(LOG_ERR, "%s (%s) detect read failed (%d:%d)", klncgpu->drv->dname, devpath, recd, err);
  			} else if (recd < 1) {
  				applog(LOG_ERR, "%s (%s) detect empty reply (%d)",	klncgpu->drv->dname, devpath, recd);
  			} else if (reply[0] == 'I' && reply[1] == 0) {
  
  				applog(LOG_DEBUG, "%s (%s) detect successful", klncgpu->drv->dname, devpath);
  				KlondikeID = *(IDENTITY *)(&reply[2]);
  				klncgpu->device_path = strdup(devpath);
  				update_usb_stats(klncgpu);
  				if (!add_cgpu(klncgpu))
  					break;
  				applog(LOG_DEBUG, "Klondike cgpu added");
  				return true;
  			}
  		}
  		usb_uninit(klncgpu);
  	}
  	free(klninfo->replies);
  	free(klncgpu);
  	return false;
  }
  
  static void klondike_detect(bool __maybe_unused hotplug)
  {
  	usb_detect(&klondike_drv, klondike_detect_one);
  }
  
  static void klondike_identify(__maybe_unused struct cgpu_info *klncgpu)
  {
  	//SendCmdGetReply(klncgpu, 'I', 0, 0, NULL);
  }
  
  static void klondike_check_nonce(struct cgpu_info *klncgpu, WORKRESULT *result)
  {
  	struct klondike_info *klninfo = (struct klondike_info *)(klncgpu->device_data);
  	struct work *work, *tmp;
  
  	applog(LOG_DEBUG, "Klondike FOUND NONCE (%02x:%08x)", result->workid, result->nonce);
  
  	HASH_ITER(hh, klncgpu->queued_work, work, tmp) {
  		if (work->queued && (work->subid == (result->device*256 + result->workid))) {
  
  			wr_lock(&(klninfo->stat_lock));
  			klninfo->devinfo[result->device].noncecount++;
  			klninfo->noncecount++;
  			wr_unlock(&(klninfo->stat_lock));
  
  			result->nonce = le32toh(result->nonce - 0xC0);
  			applog(LOG_DEBUG, "Klondike SUBMIT NONCE (%02x:%08x)", result->workid, result->nonce);
  			bool ok = submit_nonce(klncgpu->thr[0], work, result->nonce);
  
  			applog(LOG_DEBUG, "Klondike chip stats %d, %08x, %d, %d", result->device, result->nonce, klninfo->devinfo[result->device].rangesize, klninfo->status[result->device].chipcount);
  			klninfo->devinfo[result->device].chipstats[(result->nonce / klninfo->devinfo[result->device].rangesize) + (ok ? 0 : klninfo->status[result->device].chipcount)]++;
  			return;
  		}
  	}
  
  	applog(LOG_ERR, "%s%i:%d unknown work (%02x:%08x) - ignored",
  		klncgpu->drv->name, klncgpu->device_id, result->device, result->workid, result->nonce);
  	//inc_hw_errors(klncgpu->thr[0]);
  }
  
  // Change this to LOG_WARNING if you wish to always see the replies
  #define READ_DEBUG LOG_DEBUG
  
  // thread to keep looking for replies
  static void *klondike_get_replies(void *userdata)
  {
  	struct cgpu_info *klncgpu = (struct cgpu_info *)userdata;
  	struct klondike_info *klninfo = (struct klondike_info *)(klncgpu->device_data);
  	struct klondike_status *ks;
  	struct _workresult *wr;
  	struct klondike_cfg *kc;
  	struct klondike_id *ki;
  	char *replybuf;
  	int err, recd;
  
  	applog(LOG_DEBUG, "Klondike listening for replies");
  
  	while (klninfo->shutdown == false) {
  		if (klncgpu->usbinfo.nodev)
  			return NULL;
  
  		replybuf = klninfo->replies + klninfo->nextreply * REPLY_BUFSIZE;
  		replybuf[0] = 0;
  
  		err = usb_read(klncgpu, replybuf+1, REPLY_SIZE, &recd, C_GETRESULTS);
  		if (!err && recd == REPLY_SIZE) {
  			if (opt_log_level <= READ_DEBUG) {
  				char *hexdata = bin2hex((unsigned char *)(replybuf+1), recd);
  				applog(READ_DEBUG, "%s (%s) reply [%s:%s]", klncgpu->drv->dname, klncgpu->device_path, replybuf+1, hexdata);
  				free(hexdata);
  			}
  			if (++klninfo->nextreply == MAX_REPLY_COUNT)
  				klninfo->nextreply = 0;
  
  			replybuf[0] = replybuf[1];
  			switch (replybuf[0]) {
  				case '=':
  					wr = (struct _workresult *)(replybuf+1);
  					klondike_check_nonce(klncgpu, (WORKRESULT *)replybuf);
  					applog(READ_DEBUG,
  						"%s (%s) reply: work [%c] device=%d workid=%d"
  						" nonce=0x%08x",
  						klncgpu->drv->dname, klncgpu->device_path,
  						*(replybuf+1),
  						(int)(wr->device),
  						(int)(wr->workid),
  						(unsigned int)(wr->nonce));
  					break;
  				case 'S':
  				case 'W':
  				case 'A':
  				case 'E':
  					ks = (struct klondike_status *)(replybuf+1);
  					wr_lock(&(klninfo->stat_lock));
  					klninfo->errorcount += ks->errorcount;
  					klninfo->noisecount += ks->noise;
  					wr_unlock(&(klninfo->stat_lock));
  					applog(READ_DEBUG,
  						"%s (%s) reply: status [%c] chips=%d slaves=%d"
  						" workcq=%d workid=%d temp=%d fan=%d errors=%d"
  						" hashes=%d max=%d noise=%d",
  						klncgpu->drv->dname, klncgpu->device_path,
  						*(replybuf+1),
  						(int)(ks->chipcount),
  						(int)(ks->slavecount),
  						(int)(ks->workqc),
  						(int)(ks->workid),
  						(int)(ks->temp),
  						(int)(ks->fanspeed),
  						(int)(ks->errorcount),
  						(int)(ks->hashcount),
  						(int)(ks->maxcount),
  						(int)(ks->noise));
  					break;
  				case 'C':
  					kc = (struct klondike_cfg *)(replybuf+2);
  					applog(READ_DEBUG,
  						"%s (%s) reply: config [%c] clock=%d temptarget=%d"
  						" tempcrit=%d fan=%d",
  						klncgpu->drv->dname, klncgpu->device_path,
  						*(replybuf+1),
  						(int)(kc->hashclock),
  						(int)(kc->temptarget),
  						(int)(kc->tempcritical),
  						(int)(kc->fantarget));
  					break;
  				case 'I':
  					ki = (struct klondike_id *)(replybuf+2);
  					applog(READ_DEBUG,
  						"%s (%s) reply: info [%c] version=0x%02x prod=%.7s"
  						" serial=0x%08x",
  						klncgpu->drv->dname, klncgpu->device_path,
  						*(replybuf+1),
  						(int)(ki->version),
  						ki->product,
  						(unsigned int)(ki->serial));
  					break;
  				default:
  					break;
  			}
  		}
  	}
  	return NULL;
  }
  
  static void klondike_flush_work(struct cgpu_info *klncgpu)
  {
  	struct klondike_info *klninfo = (struct klondike_info *)(klncgpu->device_data);
  	int dev;
  
  	applog(LOG_DEBUG, "Klondike flushing work");
  	for (dev = 0; dev <= klninfo->status->slavecount; dev++) {
  		char *reply = SendCmdGetReply(klncgpu, 'A', dev, 0, NULL);
  		if (reply != NULL) {
  			wr_lock(&(klninfo->stat_lock));
  			klninfo->status[dev] = *(WORKSTATUS *)(reply+2);
  			wr_unlock(&(klninfo->stat_lock));
  		}
  	}
  }
  
  static bool klondike_thread_prepare(struct thr_info *thr)
  {
  	struct cgpu_info *klncgpu = thr->cgpu;
  	struct klondike_info *klninfo = (struct klondike_info *)(klncgpu->device_data);
  
  	if (thr_info_create(&(klninfo->replies_thr), NULL, klondike_get_replies, (void *)klncgpu)) {
  		applog(LOG_ERR, "%s%i: thread create failed", klncgpu->drv->name, klncgpu->device_id);
  		return false;
  	}
  	pthread_detach(klninfo->replies_thr.pth);
  
  	// let the listening get started
  	cgsleep_ms(100);
  
  	return klondike_init(klncgpu);
  }
  
  static bool klondike_thread_init(struct thr_info *thr)
  {
  	struct cgpu_info *klncgpu = thr->cgpu;
  
  	if (klncgpu->usbinfo.nodev)
  		return false;
  
  	klondike_flush_work(klncgpu);
  
  	return true;
  }
  
  static void klondike_shutdown(struct thr_info *thr)
  {
  	struct cgpu_info *klncgpu = thr->cgpu;
  	struct klondike_info *klninfo = (struct klondike_info *)(klncgpu->device_data);
  	int dev;
  
  	applog(LOG_DEBUG, "Klondike shutting down work");
  	for (dev = 0; dev <= klninfo->status->slavecount; dev++) {
  		SendCmdGetReply(klncgpu, 'E', dev, 1, "0");
  	}
  	klncgpu->shutdown = klninfo->shutdown = true;
  }
  
  static void klondike_thread_enable(struct thr_info *thr)
  {
  	struct cgpu_info *klncgpu = thr->cgpu;
  
  	if (klncgpu->usbinfo.nodev)
  		return;
  
  	//SendCmdGetReply(klncgpu, 'E', 0, 1, "0");
  
  }
  
  static bool klondike_send_work(struct cgpu_info *klncgpu, int dev, struct work *work)
  {
  	struct klondike_info *klninfo = (struct klondike_info *)(klncgpu->device_data);
  	struct work *tmp;
  	WORKTASK data;
  
  	if (klncgpu->usbinfo.nodev)
  		return false;
  
  	memcpy(data.midstate, work->midstate, MIDSTATE_BYTES);
  	memcpy(data.merkle, work->data + MERKLE_OFFSET, MERKLE_BYTES);
  	data.workid = (uint8_t)(klninfo->devinfo[dev].nextworkid++ & 0xFF);
  	work->subid = dev*256 + data.workid;
  
  	if (opt_log_level <= LOG_DEBUG) {
  		char *hexdata = bin2hex(&data.workid, sizeof(data)-3);
  		applog(LOG_DEBUG, "WORKDATA: %s", hexdata);
  		free(hexdata);
  	}
  
  	applog(LOG_DEBUG, "Klondike sending work (%d:%02x)", dev, data.workid);
  	char *reply = SendCmdGetReply(klncgpu, 'W', dev, sizeof(data)-3, &data.workid);
  	if (reply != NULL) {
  		wr_lock(&(klninfo->stat_lock));
  		klninfo->status[dev] = *(WORKSTATUS *)(reply+2);
  		wr_unlock(&(klninfo->stat_lock));
  
  		// remove old work
  		HASH_ITER(hh, klncgpu->queued_work, work, tmp) {
  		if (work->queued && (work->subid == (int)(dev*256 + ((klninfo->devinfo[dev].nextworkid-2*MAX_WORK_COUNT) & 0xFF))))
  			work_completed(klncgpu, work);
  		}
  		return true;
  	}
  	return false;
  }
  
  static bool klondike_queue_full(struct cgpu_info *klncgpu)
  {
  	struct klondike_info *klninfo = (struct klondike_info *)(klncgpu->device_data);
  	struct work *work = NULL;
  	int dev, queued;
  
  	for (queued = 0; queued < MAX_WORK_COUNT-1; queued++)
  		for (dev = 0; dev <= klninfo->status->slavecount; dev++)
  			if (klninfo->status[dev].workqc <= queued) {
  				if (!work)
  					work = get_queued(klncgpu);
  				if (unlikely(!work))
  					return false;
  				if (klondike_send_work(klncgpu, dev, work)) {
  					work = NULL;
  					break;
  				}
  			}
  
  	return true;
  }
  
  static int64_t klondike_scanwork(struct thr_info *thr)
  {
  	struct cgpu_info *klncgpu = thr->cgpu;
  	struct klondike_info *klninfo = (struct klondike_info *)(klncgpu->device_data);
  	int64_t newhashcount = 0;
  	int dev;
  
  	if (klncgpu->usbinfo.nodev)
  		return -1;
  
  	restart_wait(thr, 200);
  	if (klninfo->status != NULL) {
  		rd_lock(&(klninfo->stat_lock));
  		for (dev = 0; dev <= klninfo->status->slavecount; dev++) {
  			uint64_t newhashdev = 0;
  			if (klninfo->devinfo[dev].lasthashcount > klninfo->status[dev].hashcount) // todo: chg this to check workid for wrapped instead
  				newhashdev += klninfo->status[dev].maxcount; // hash counter wrapped
  			newhashdev += klninfo->status[dev].hashcount - klninfo->devinfo[dev].lasthashcount;
  			klninfo->devinfo[dev].lasthashcount = klninfo->status[dev].hashcount;
  			if (klninfo->status[dev].maxcount != 0)
  				klninfo->hashcount += (newhashdev << 32) / klninfo->status[dev].maxcount;
  
  			// todo: check stats for critical conditions
  		}
  		newhashcount += 0xffffffffull * (uint64_t)klninfo->noncecount;
  		klninfo->noncecount = 0;
  		rd_unlock(&(klninfo->stat_lock));
  	}
  	return newhashcount;
  }
  
  
  static void get_klondike_statline_before(char *buf, size_t siz, struct cgpu_info *klncgpu)
  {
  	struct klondike_info *klninfo = (struct klondike_info *)(klncgpu->device_data);
  	uint8_t temp = 0xFF;
  	uint16_t fan = 0;
  	uint16_t clock = 0;
  	int dev;
  	char tmp[16];
  
  	if (klninfo->status == NULL)
  		return;
  
  	rd_lock(&(klninfo->stat_lock));
  	for (dev = 0; dev <= klninfo->status->slavecount; dev++) {
  		if (klninfo->status[dev].temp < temp)
  			temp = klninfo->status[dev].temp;
  		fan += klninfo->cfg[dev].fantarget;
  		clock += klninfo->cfg[dev].hashclock;
  	}
  	fan /= klninfo->status->slavecount+1;
  	clock /= klninfo->status->slavecount+1;
  	rd_unlock(&(klninfo->stat_lock));
  
  	snprintf(tmp, sizeof(tmp), "%2.0fC", cvtKlnToC(temp));
  	if (strlen(tmp) < 4)
  		strcat(tmp, " ");
  
  	tailsprintf(buf, siz, "%3dMHz %3d%% %s| ", (int)clock, fan*100/255, tmp);
  }
  
  static struct api_data *klondike_api_stats(struct cgpu_info *klncgpu)
  {
  	struct klondike_info *klninfo = (struct klondike_info *)(klncgpu->device_data);
  	struct api_data *root = NULL;
  	char buf[32];
  	int dev;
  
  	if (klninfo->status == NULL)
  		return NULL;
  
  	rd_lock(&(klninfo->stat_lock));
  	for (dev = 0; dev <= klninfo->status->slavecount; dev++) {
  
  		float fTemp = cvtKlnToC(klninfo->status[dev].temp);
  		sprintf(buf, "Temp %d", dev);
  		root = api_add_temp(root, buf, &fTemp, true);
  
  		double dClk = (double)klninfo->cfg[dev].hashclock;
  		sprintf(buf, "Clock %d", dev);
  		root = api_add_freq(root, buf, &dClk, true);
  
  		unsigned int iFan = (unsigned int)100 * klninfo->cfg[dev].fantarget / 255;
  		sprintf(buf, "Fan Percent %d", dev);
  		root = api_add_int(root, buf, (int *)(&iFan), true);
  
  		iFan = 0;
  		if (klninfo->status[dev].fanspeed > 0)
  			iFan = (unsigned int)TACH_FACTOR / klninfo->status[dev].fanspeed;
  		sprintf(buf, "Fan RPM %d", dev);
  		root = api_add_int(root, buf, (int *)(&iFan), true);
  
  		if (klninfo->devinfo[dev].chipstats != NULL) {
  			char data[2048];
  			char one[32];
  			int n;
  
  			sprintf(buf, "Nonces / Chip %d", dev);
  			data[0] = '\0';
  			for (n = 0; n < klninfo->status[dev].chipcount; n++) {
  				snprintf(one, sizeof(one), "%07d ", klninfo->devinfo[dev].chipstats[n]);
  				strcat(data, one);
  			}
  			root = api_add_string(root, buf, data, true);
  
  			sprintf(buf, "Errors / Chip %d", dev);
  			data[0] = '\0';
  			for (n = 0; n < klninfo->status[dev].chipcount; n++) {
  				snprintf(one, sizeof(one), "%07d ", klninfo->devinfo[dev].chipstats[n + klninfo->status[dev].chipcount]);
  				strcat(data, one);
  			}
  			root = api_add_string(root, buf, data, true);
  		}
  	}
  
  	root = api_add_uint64(root, "Hash Count", &(klninfo->hashcount), true);
  	root = api_add_uint64(root, "Error Count", &(klninfo->errorcount), true);
  	root = api_add_uint64(root, "Noise Count", &(klninfo->noisecount), true);
  
  	rd_unlock(&(klninfo->stat_lock));
  
  	return root;
  }
  
  struct device_drv klondike_drv = {
  	.drv_id = DRIVER_klondike,
  	.dname = "Klondike",
  	.name = "KLN",
  	.drv_detect = klondike_detect,
  	.get_api_stats = klondike_api_stats,
  	.get_statline_before = get_klondike_statline_before,
  	.get_stats = klondike_get_stats,
  	.identify_device = klondike_identify,
  	.thread_prepare = klondike_thread_prepare,
  	.thread_init = klondike_thread_init,
  	.hash_work = hash_queued_work,
  	.scanwork = klondike_scanwork,
  	.queue_full = klondike_queue_full,
  	.flush_work = klondike_flush_work,
  	.thread_shutdown = klondike_shutdown,
  	.thread_enable = klondike_thread_enable
  };
  

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