Titan: Do not do actual configuration job in API thread context.

  Instead, send commands to the worker thread to do the actual job.
  That prevents API stalls and helps with BFGMiner frequent restarts.

driver-titan.c

@@ -90,6 +90,10 @@ struct knc_titan_die {
 
 	int freq;
 	int manual_check_count;
+
+	bool reconfigure_request;
+	bool delete_request;
+	int add_request;
 };
 
 struct knc_titan_info {
@@ -451,6 +455,7 @@ static bool die_test_and_add(struct knc_titan_info * const knc, int asic, int di
 {
 	struct knc_die_info die_info;
 	char repr[6];
+	struct knc_titan_die *die_p = &(knc->dies[asic][die]);
 
 	snprintf(repr, sizeof(repr), "%s %d", knc_titan_drv.name, asic);
 	die_info.cores = KNC_TITAN_CORES_PER_DIE; /* core hint */
@@ -458,11 +463,13 @@ static bool die_test_and_add(struct knc_titan_info * const knc, int asic, int di
 	if (!knc_titan_get_info(repr, knc->ctx, asic, die, &die_info))
 		die_info.cores = -1;
 	if (0 < die_info.cores) {
+		die_p->add_request = 0;
 		sprintf(errbuf, "Die[%d:%d] not detected", asic, die);
 		return false;
 	}
 
-	/* TODO: add procs */
+	/* TODO: Implement add_request in knc_titan_poll */
+	die_p->add_request = die_info.cores;
 	sprintf(errbuf, "Die[%d:%d] has %d cores; was not added (addition not implemented)", asic, die, die_info.cores);
 
 	return false;
@@ -472,21 +479,22 @@ static bool die_enable(struct knc_titan_info * const knc, int asic, int die, cha
 {
 	bool res = true;
 
-	cgpu_request_control(knc->cgpu);
 	if (0 >= knc->dies[asic][die].cores)
 		res = die_test_and_add(knc, asic, die, errbuf);
 	if (res) {
-		res = configure_one_die(knc, asic, die);
+		struct knc_titan_die *die_p = &(knc->dies[asic][die]);
+		die_p->reconfigure_request = true;
+		res = true;
 	}
-	cgpu_release_control(knc->cgpu);
 
 	return res;
 }
 
 static bool die_disable(struct knc_titan_info * const knc, int asic, int die, char * const errbuf)
 {
-	cgpu_request_control(knc->cgpu);
-	/* TODO: delete procs */
+	/* TODO: Implement delete_request in knc_titan_poll */
+	struct knc_titan_die *die_p = &(knc->dies[asic][die]);
+	die_p->delete_request = true;
 	cgpu_release_control(knc->cgpu);
 	sprintf(errbuf, "die_disable[%d:%d] not imnplemented", asic, die);
 	return false;
@@ -643,6 +651,24 @@ static void knc_titan_poll(struct thr_info * const thr)
 
 	knc_titan_prune_local_queue(thr);
 
+	/* Process API requests */
+	for (asic = 0; asic < KNC_TITAN_MAX_ASICS; ++asic) {
+		for (die = 0; die < KNC_TITAN_DIES_PER_ASIC; ++die) {
+			die_p = &(knc->dies[asic][die]);
+			if (__sync_bool_compare_and_swap(&die_p->reconfigure_request, true, false)) {
+				configure_one_die(knc, asic, die);
+			}
+			if (__sync_bool_compare_and_swap(&die_p->delete_request, true, false)) {
+				/* TODO: Implement delete_request */
+			}
+			int add_cores = __sync_fetch_and_and(&die_p->add_request, 0);
+			if (0 < add_cores) {
+				/* TODO: Implement add_request */
+			}
+		}
+	}
+
+	/* Send new works */
 	for (asic = 0; asic < KNC_TITAN_MAX_ASICS; ++asic) {
                 fpga_status_checked = false;
                 num_request_busy = KNC_TITAN_DIES_PER_ASIC;