nvml: small changes to handle the 750ti app clocks

dynamically alloc the hardcoded gpu clocks list array size.

Unlike the 9xx, the 750ti api call requires to get them all (361.62)

Something was "fixed" recently for the 750 Ti in linux drivers...

nvml.cpp

@@ -329,31 +329,36 @@ int nvml_set_clocks(nvml_handle *nvmlh, int dev_id)
 	if (device_mem_clocks[dev_id]) mem_clk = device_mem_clocks[dev_id];
 	if (device_gpu_clocks[dev_id]) gpu_clk = device_gpu_clocks[dev_id];
 
-	// these functions works for the 960 and the 970 (346.72+), not for the 750 Ti
-	uint32_t nclocks = 0, clocks[127] = { 0 };
+	// these functions works for the 960 and the 970 (346.72+), and for the 750 Ti with driver ~361+
+	uint32_t nclocks = 0, mem_clocks[32] = { 0 };
 	nvmlh->nvmlDeviceGetSupportedMemoryClocks(nvmlh->devs[n], &nclocks, NULL);
-	nclocks = min(nclocks, 127);
+	nclocks = min(nclocks, 32);
 	if (nclocks)
-		nvmlh->nvmlDeviceGetSupportedMemoryClocks(nvmlh->devs[n], &nclocks, clocks);
+		nvmlh->nvmlDeviceGetSupportedMemoryClocks(nvmlh->devs[n], &nclocks, mem_clocks);
 	for (uint8_t u=0; u < nclocks; u++) {
 		// ordered by pstate (so highest is first memory clock - P0)
-		if (clocks[u] <= mem_clk) {
-			mem_clk = clocks[u];
+		if (mem_clocks[u] <= mem_clk) {
+			mem_clk = mem_clocks[u];
 			break;
 		}
 	}
 
+	uint32_t* gpu_clocks = NULL;
 	nclocks = 0;
 	nvmlh->nvmlDeviceGetSupportedGraphicsClocks(nvmlh->devs[n], mem_clk, &nclocks, NULL);
-	nclocks = min(nclocks, 127);
-	if (nclocks)
-		nvmlh->nvmlDeviceGetSupportedGraphicsClocks(nvmlh->devs[n], mem_clk, &nclocks, clocks);
-	for (uint8_t u=0; u < nclocks; u++) {
-		// ordered desc, so get first
-		if (clocks[u] <= gpu_clk) {
-			gpu_clk = clocks[u];
-			break;
+	if (nclocks) {
+		if (opt_debug)
+			applog(LOG_DEBUG, "GPU #%d: %u clocks found for mem %u", dev_id, nclocks, mem_clk);
+		gpu_clocks = (uint32_t*) calloc(1, sizeof(uint32_t) * nclocks + 4);
+		nvmlh->nvmlDeviceGetSupportedGraphicsClocks(nvmlh->devs[n], mem_clk, &nclocks, gpu_clocks);
+		for (uint8_t u=0; u < nclocks; u++) {
+			// ordered desc, so get first
+			if (gpu_clocks[u] <= gpu_clk) {
+				gpu_clk = gpu_clocks[u];
+				break;
+			}
 		}
+		free(gpu_clocks);
 	}
 
 	rc = nvmlh->nvmlDeviceSetApplicationsClocks(nvmlh->devs[n], mem_clk, gpu_clk);
@@ -435,37 +440,41 @@ int nvml_set_pstate(nvml_handle *nvmlh, int dev_id)
 	if (device_mem_clocks[dev_id]) mem_clk = device_mem_clocks[dev_id];
 	if (device_gpu_clocks[dev_id]) gpu_clk = device_gpu_clocks[dev_id];
 
-	// these functions works for the 960 and the 970 (346.72+), not for the 750 Ti
-	uint32_t nclocks = 0, clocks[127] = { 0 };
+	// these functions works for the 960 and the 970 (346.72+), and for the 750 Ti with driver ~361+
+	uint32_t nclocks = 0, mem_clocks[32] = { 0 };
 	int8_t wanted_pstate = device_pstate[dev_id];
 	nvmlh->nvmlDeviceGetSupportedMemoryClocks(nvmlh->devs[n], &nclocks, NULL);
-	nclocks = min(nclocks, 127);
+	nclocks = min(nclocks, 32);
 	if (nclocks)
-		nvmlh->nvmlDeviceGetSupportedMemoryClocks(nvmlh->devs[n], &nclocks, clocks);
+		nvmlh->nvmlDeviceGetSupportedMemoryClocks(nvmlh->devs[n], &nclocks, mem_clocks);
+	if (wanted_pstate+1 > nclocks) {
+		applog(LOG_WARNING, "GPU #%d: only %u mem clocks available (p-states)", dev_id, nclocks);
+	}
 	for (uint8_t u=0; u < nclocks; u++) {
 		// ordered by pstate (so highest P0 first)
 		if (u == wanted_pstate) {
-			mem_clk = clocks[u];
+			mem_clk = mem_clocks[u];
 			break;
 		}
 	}
 
+	uint32_t* gpu_clocks = NULL;
 	nclocks = 0;
 	nvmlh->nvmlDeviceGetSupportedGraphicsClocks(nvmlh->devs[n], mem_clk, &nclocks, NULL);
-	nclocks = min(nclocks, 127);
-	if (nclocks)
-		nvmlh->nvmlDeviceGetSupportedGraphicsClocks(nvmlh->devs[n], mem_clk, &nclocks, clocks);
-	for (uint8_t u=0; u < nclocks; u++) {
-		// ordered desc, so get first
-		if (clocks[u] <= gpu_clk) {
-			gpu_clk = clocks[u];
-			break;
+	if (nclocks) {
+		gpu_clocks = (uint32_t*) calloc(1, sizeof(uint32_t) * nclocks + 4);
+		rc = nvmlh->nvmlDeviceGetSupportedGraphicsClocks(nvmlh->devs[n], mem_clk, &nclocks, gpu_clocks);
+		if (rc == NVML_SUCCESS) {
+			// ordered desc, get the max app clock (do not limit)
+			gpu_clk = gpu_clocks[0];
 		}
+		free(gpu_clocks);
 	}
 
 	rc = nvmlh->nvmlDeviceSetApplicationsClocks(nvmlh->devs[n], mem_clk, gpu_clk);
 	if (rc != NVML_SUCCESS) {
-		applog(LOG_WARNING, "GPU #%d: pstate %s", dev_id, nvmlh->nvmlErrorString(rc));
+		applog(LOG_WARNING, "GPU #%d: pstate P%d (%u/%u) %s", dev_id, (int) wanted_pstate,
+			mem_clk, gpu_clk, nvmlh->nvmlErrorString(rc));
 		return -1;
 	}