1 files changed, 124 insertions, 0 deletions
diff --git a/tracefile_ftrace.c b/tracefile_ftrace.c
new file mode 100644
index 0000000..ab07bb4
--- /dev/null
+++ b/tracefile_ftrace.c
@@ -0,0 +1,124 @@
+#include "topology.h"
+#include "trace_ops.h"
+#include "utils.h"
+#include "idlestat.h"
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+#include <malloc.h>
+#include <assert.h>
+#include <values.h>
+
+#define TRACE_FORMAT "%*[^]]] %*s %lf:%*[^=]=%u%*[^=]=%d"
+
+static int ftrace_magic(const char *filename)
+{
+	FILE *f;
+	char *line;
+	char buffer[BUFSIZE];
+
+	f = fopen(filename, "r");
+	if (!f) {
+		fprintf(stderr, "%s: failed to open '%s': %m\n", __func__,
+					filename);
+		return -1;
+	}
+
+	line = fgets(buffer, BUFSIZE, f);
+	fclose(f);
+
+	return (line != NULL) && !strncmp(buffer, "# tracer", 8);
+}
+
+static struct cpuidle_datas * ftrace_load(const char *filename)
+{
+	FILE *f;
+	unsigned int nrcpus;
+	struct cpuidle_datas *datas;
+	int ret;
+	char *line;
+	char buffer[BUFSIZE];
+
+	f = fopen(filename, "r");
+	if (!f) {
+		fprintf(stderr, "%s: failed to open '%s': %m\n", __func__,
+					filename);
+		return ptrerror(NULL);
+	}
+
+	/* Version line */
+	line = fgets(buffer, BUFSIZE, f);
+	if (!line)
+		goto error_close;
+
+	/* Number of CPUs */
+	nrcpus = 0;
+	while(!feof(f)) {
+		if (buffer[0] != '#')
+			break;
+		if (strncmp(buffer, "#P:", 3)) {
+			ret = sscanf(buffer, "#%*[^#]#P:%u", &nrcpus);
+			if (ret != 1)
+				nrcpus = 0;
+		}
+		line = fgets(buffer, BUFSIZE, f);
+	}
+
+	if (!line)
+		goto error_close;
+
+	if (!nrcpus) {
+		fclose(f);
+		return ptrerror("Cannot load trace file (nrcpus == 0)");
+	}
+
+	datas = calloc(sizeof(*datas), 1);
+	if (!datas) {
+		fclose(f);
+		return ptrerror(__func__);
+	}
+
+	datas->nrcpus = nrcpus;
+	datas->pstates = build_pstate_info(nrcpus);
+	if (!datas->pstates)
+		goto propagate_error_free_datas;
+
+	datas->topo = read_sysfs_cpu_topo();
+	if (is_err(datas->topo))
+		goto propagate_error_free_datas;
+
+	/* Build C-state information from current host sysfs */
+	datas->cstates = build_cstate_info(nrcpus);
+	if (is_err(datas->cstates))
+		goto propagate_error_free_datas;
+
+	load_text_data_lines(f, buffer, datas);
+
+	fclose(f);
+
+	return datas;
+
+ propagate_error_free_datas:
+	fclose(f);
+	if (!is_err(datas->topo))
+		release_cpu_topo_info(datas->topo);
+	if (!is_err(datas->cstates))
+		release_cstate_info(datas->cstates, nrcpus);
+	free(datas);
+	return ptrerror(NULL);
+
+ error_close:
+	fclose(f);
+	fprintf(stderr, "%s: error or EOF while reading '%s': %m",
+		__func__, filename);
+	return ptrerror(NULL);
+}
+
+
+static const struct trace_ops ftrace_trace_ops = {
+	.name = "ftrace",
+	.check_magic = ftrace_magic,
+	.load = ftrace_load
+};
+
+EXPORT_TRACE_OPS(ftrace);