Rewrite libsmctrl_test_gpc_info to output clearly and take a GPU ID

1 files changed, 27 insertions, 6 deletions

diff --git a/libsmctrl_test_gpc_info.c b/libsmctrl_test_gpc_info.c
index 5ef44b1..9b2b963 100644
--- a/libsmctrl_test_gpc_info.c
+++ b/libsmctrl_test_gpc_info.c
@@ -1,14 +1,35 @@
+// Copyright 2024 Joshua Bakita
+#define _GNU_SOURCE
+#include <error.h>
+#include <errno.h>
 #include <stdio.h>
 #include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
 #include "libsmctrl.h"
 
-int main() {
-        uint32_t num_gpcs;
-        uint64_t* masks;
-        libsmctrl_get_gpc_info(&num_gpcs, &masks, 1);
-        printf("Num GPCs: %d\n", num_gpcs);
+int main(int argc, char** argv) {
+        uint32_t num_gpcs = 0, num_tpcs = 0;
+        uint64_t* masks = NULL;
+        int res;
+        int gpu_id = 0;
+        // Optionally support specifying the GPU ID to query via an argument
+        // Important: This GPU ID must match the ID used by the nvdebug module. See
+        //            the documentation on libsmctrl_get_gpc_info() for details.
+        if (argc > 2 || (argc == 2 && (!strcmp(argv[1], "--help") || !strcmp(argv[1], "-h")))) {
+                fprintf(stderr, "Usage: %s <nvdebug GPU ID>\n", argv[0]);
+                return 1;
+        }
+        if (argc > 1)
+                gpu_id = atoi(argv[1]);
+        if ((res = libsmctrl_get_gpc_info(&num_gpcs, &masks, gpu_id)) != 0)
+                error(1, res, "libsmctrl_get_gpc_info() failed");
+        printf("%s: GPU%d has %d enabled GPCs.\n", program_invocation_name, gpu_id, num_gpcs);
         for (int i = 0; i < num_gpcs; i++) {
-                printf("Mask of TPCs associated with GPC %d: %#018lx\n", i, masks[i]);
+                num_tpcs += __builtin_popcountl(masks[i]);
+                printf("%s: Mask of %d TPCs associated with GPC %d: %#018lx\n", program_invocation_name, __builtin_popcountl(masks[i]), i, masks[i]);
         }
+        printf("%s: Total of %u enabled TPCs.\n", program_invocation_name, num_tpcs);
         return 0;
 }