tools: Add guest trace agent as a user tool

[~andy/linux] / tools / virtio / virtio-trace / trace-agent.h

diff --git a/tools/virtio/virtio-trace/trace-agent.h b/tools/virtio/virtio-trace/trace-agent.h
new file mode 100644 (file)
index 0000000..8de79bf
--- /dev/null
+++ b/tools/virtio/virtio-trace/trace-agent.h
@@ -0,0 +1,75 @@
+#ifndef __TRACE_AGENT_H__
+#define __TRACE_AGENT_H__
+#include <pthread.h>
+#include <stdbool.h>
+
+#define MAX_CPUS       256
+#define PIPE_INIT       (1024*1024)
+
+/*
+ * agent_info - structure managing total information of guest agent
+ * @pipe_size: size of pipe (default 1MB)
+ * @use_stdout:        set to true when o option is added (default false)
+ * @cpus:      total number of CPUs
+ * @ctl_fd:    fd of control path, /dev/virtio-ports/agent-ctl-path
+ * @rw_ti:     structure managing information of read/write threads
+ */
+struct agent_info {
+       unsigned long pipe_size;
+       bool use_stdout;
+       int cpus;
+       int ctl_fd;
+       struct rw_thread_info *rw_ti[MAX_CPUS];
+};
+
+/*
+ * rw_thread_info - structure managing a read/write thread a cpu
+ * @cpu_num:   cpu number operating this read/write thread
+ * @in_fd:     fd of reading trace data path in cpu_num
+ * @out_fd:    fd of writing trace data path in cpu_num
+ * @read_pipe: fd of read pipe
+ * @write_pipe:        fd of write pipe
+ * @pipe_size: size of pipe (default 1MB)
+ */
+struct rw_thread_info {
+       int cpu_num;
+       int in_fd;
+       int out_fd;
+       int read_pipe;
+       int write_pipe;
+       unsigned long pipe_size;
+};
+
+/* use for stopping rw threads */
+extern bool global_sig_receive;
+
+/* use for notification */
+extern bool global_run_operation;
+extern pthread_mutex_t mutex_notify;
+extern pthread_cond_t cond_wakeup;
+
+/* for controller of read/write threads */
+extern int rw_ctl_init(const char *ctl_path);
+extern void *rw_ctl_loop(int ctl_fd);
+
+/* for trace read/write thread */
+extern void *rw_thread_info_new(void);
+extern void *rw_thread_init(int cpu, const char *in_path, const char *out_path,
+                       bool stdout_flag, unsigned long pipe_size,
+                       struct rw_thread_info *rw_ti);
+extern pthread_t rw_thread_run(struct rw_thread_info *rw_ti);
+
+static inline void *zalloc(size_t size)
+{
+       return calloc(1, size);
+}
+
+#define pr_err(format, ...) fprintf(stderr, format, ## __VA_ARGS__)
+#define pr_info(format, ...) fprintf(stdout, format, ## __VA_ARGS__)
+#ifdef DEBUG
+#define pr_debug(format, ...) fprintf(stderr, format, ## __VA_ARGS__)
+#else
+#define pr_debug(format, ...) do {} while (0)
+#endif
+
+#endif /*__TRACE_AGENT_H__*/