test: Add helper to read LPAR info from /proc

Signed-off-by: Matheus Castanho <msc@linux.ibm.com>

test/test_utils.c

@@ -17,6 +17,8 @@
 
 Byte ran_data[DATA_MAX_LEN];
 
+struct lpar_info lpar_info;
+
 static char dict[] = {
 	'a', 'b', 'c', 'd', 'e', 'f', 'g',
 	'h', 'i', 'j', 'k', 'l', 'm', 'n',
@@ -67,6 +69,52 @@ int is_powervm(void) {
 	return !access(dtpath, F_OK);
 }
 
+int get_lpar_info(void) {
+	char *line = NULL;
+	FILE *f;
+	size_t n;
+
+	const char* lparcfg = "/proc/ppc64/lparcfg";
+
+	const char shared_mode_key[] = "shared_processor_mode";
+	const size_t shared_mode_len = sizeof(shared_mode_key)/sizeof(char) - 1;
+	bool shared_mode_found = false;
+
+	const char active_procs_key[] = "partition_active_processors";
+	const size_t active_procs_len = sizeof(active_procs_key)/sizeof(char) -1;
+	bool active_procs_found = false;
+
+	f = fopen(lparcfg, "r");
+	if (!f) {
+		fprintf(stderr, "Couldn't file %s!\n", lparcfg);
+		return -1;
+	}
+
+	do {
+		ssize_t nchars = getline(&line, &n, f);
+
+		if (nchars == 0 || nchars == -1)
+			break;
+
+		if (!shared_mode_found &&
+		    !strncmp(shared_mode_key, line, shared_mode_len)) {
+			lpar_info.shared_proc_mode = line[nchars-2] == '1';
+			shared_mode_found = true;
+			printf("Mode: %s\n",
+			       lpar_info.shared_proc_mode ? "shared" : "dedicated");
+		} else if (!active_procs_found &&
+			   !strncmp(active_procs_key, line, active_procs_len)) {
+			lpar_info.active_processors = atoi(&line[active_procs_len+1]);
+			active_procs_found = true;
+			printf("Number of active processors: %d\n",
+			       lpar_info.active_processors);
+		}
+	} while(!active_procs_found || !shared_mode_found);
+
+	free(line);
+	return 0;
+}
+
 int read_sysfs_entry(const char *path, int *val)
 {
 	char buf[32];

test/test_utils.h

@@ -2,6 +2,7 @@
 #define TEST_UTILS_H_
 
 #include <sys/time.h>
+#include <stdbool.h>
 
 #define DATA_MAX_LEN (128*1024*1024) // 128M
 
@@ -19,6 +20,12 @@ struct f_interval {
   struct timeval end;
 };
 
+struct lpar_info {
+	bool shared_proc_mode;
+	int active_processors;
+};
+
+extern struct lpar_info lpar_info;
 extern Byte ran_data[DATA_MAX_LEN];
 extern void generate_random_data(int len);
 extern Byte* generate_allocated_random_data(unsigned int len);
@@ -30,6 +37,9 @@ void zcheck_internal(int retval, int expected, char* file, int line);
 #define zcheck(val,exp) zcheck_internal((val),(exp),__FILE__,__LINE__)
 
 int is_powervm(void);
+
+int get_lpar_info(void);
+
 int read_sysfs_entry(const char *path, int *val);
 
 int _test_nx_deflate(Byte* src, unsigned int src_len, Byte* compr,