src/rasd.c

#include "cpumap.h"
#include "evsel.h"
#include "evlist.h"
#include "ras.h"
#include "debugfs.h"

#define EVENT_STR_MAX_LENGTH	1024
#define SYS_NAME_SEPARATOR	":"

unsigned int page_size;
struct perf_evlist evlist;
struct perf_rasd rasd;

/*
 * Extract the event subsystem and event names from the command
 * line argument. The syntax is 'sys:name'.
 */
static int extract_sys_name(char **str, char **sys, char **name)
{
	/* Look for the sys:name separator */
	char *sys_ptr = strsep(str, SYS_NAME_SEPARATOR);

	if (!*str || !sys_ptr)
		return -1;

	/* Is there something after the separator? */
	if (!strlen(*str))
		return -1;

	/* Alloc and fill the sys part */
	*sys = strndup(sys_ptr, EVENT_STR_MAX_LENGTH);

	/*
	 * Look for the newline in the rest of the string.
	 * If found alloc and fill the name part.
	 */
	*name = strndup(strsep(str, "\n\r"), EVENT_STR_MAX_LENGTH);

	return 0;
}

/* Add the requested tracepoint event to evlist */
static int add_tp_event(char *event_str)
{
	struct perf_evsel *tp;
	char **str = &event_str;
	int ret;

	if (extract_sys_name(str, &rasd.sys, &rasd.name))
		err("invalid event specified, syntax is sys:name");

	/* Initialize tracepoint evsel */
	tp = perf_evsel__newtp_idx(rasd.sys, rasd.name, 0);
	if (!tp)
		err("init tracepoint evsel");

	/* Add the event to the lists of events */
	list_add_tail(&tp->node, &evlist.entries);

	return ret;
}

int main()
{
	struct perf_evsel *c;
	char *ev_name = strdup("mce:mce_record");

	page_size = sysconf(_SC_PAGE_SIZE);

	/*
	 * Mount debugfs. The basepath is in debugfs_mountpoint
	 */
	if (!debugfs_mount(NULL))
		err("mounting debugfs");

	INIT_LIST_HEAD(&evlist.entries);

	/* Add event from the name string */
	add_tp_event(ev_name);

	evlist__for_each(&evlist, c) {
		/*
		 * On all online cpus by default.
		 */
		if (perf_evsel__open(c, cpu_map__new(NULL), NULL) < 0)
			err("opening counter");
	}

        if (perf_evlist__mmap(&evlist, 4 /* opts->mmap_pages */, false) < 0)
                err("Failed to mmap with %d (%s)\n", errno, strerror(errno));

	/* mmap it and all that, consume it */

	perf_evlist__delete(&evlist);

	free(rasd.name);
	free(rasd.sys);

	return 0;
}