Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/tools/io_uring/liburing.h b/tools/io_uring/liburing.h
new file mode 100644
index 0000000..5f305c8
--- /dev/null
+++ b/tools/io_uring/liburing.h
@@ -0,0 +1,183 @@
+#ifndef LIB_URING_H
+#define LIB_URING_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <sys/uio.h>
+#include <signal.h>
+#include <string.h>
+#include "../../include/uapi/linux/io_uring.h"
+#include <inttypes.h>
+#include "barrier.h"
+
+/*
+ * Library interface to io_uring
+ */
+struct io_uring_sq {
+ unsigned *khead;
+ unsigned *ktail;
+ unsigned *kring_mask;
+ unsigned *kring_entries;
+ unsigned *kflags;
+ unsigned *kdropped;
+ unsigned *array;
+ struct io_uring_sqe *sqes;
+
+ unsigned sqe_head;
+ unsigned sqe_tail;
+
+ size_t ring_sz;
+};
+
+struct io_uring_cq {
+ unsigned *khead;
+ unsigned *ktail;
+ unsigned *kring_mask;
+ unsigned *kring_entries;
+ unsigned *koverflow;
+ struct io_uring_cqe *cqes;
+
+ size_t ring_sz;
+};
+
+struct io_uring {
+ struct io_uring_sq sq;
+ struct io_uring_cq cq;
+ int ring_fd;
+};
+
+/*
+ * System calls
+ */
+extern int io_uring_setup(unsigned entries, struct io_uring_params *p);
+extern int io_uring_enter(int fd, unsigned to_submit,
+ unsigned min_complete, unsigned flags, sigset_t *sig);
+extern int io_uring_register(int fd, unsigned int opcode, void *arg,
+ unsigned int nr_args);
+
+/*
+ * Library interface
+ */
+extern int io_uring_queue_init(unsigned entries, struct io_uring *ring,
+ unsigned flags);
+extern int io_uring_queue_mmap(int fd, struct io_uring_params *p,
+ struct io_uring *ring);
+extern void io_uring_queue_exit(struct io_uring *ring);
+extern int io_uring_peek_cqe(struct io_uring *ring,
+ struct io_uring_cqe **cqe_ptr);
+extern int io_uring_wait_cqe(struct io_uring *ring,
+ struct io_uring_cqe **cqe_ptr);
+extern int io_uring_submit(struct io_uring *ring);
+extern struct io_uring_sqe *io_uring_get_sqe(struct io_uring *ring);
+
+/*
+ * Must be called after io_uring_{peek,wait}_cqe() after the cqe has
+ * been processed by the application.
+ */
+static inline void io_uring_cqe_seen(struct io_uring *ring,
+ struct io_uring_cqe *cqe)
+{
+ if (cqe) {
+ struct io_uring_cq *cq = &ring->cq;
+
+ (*cq->khead)++;
+ /*
+ * Ensure that the kernel sees our new head, the kernel has
+ * the matching read barrier.
+ */
+ write_barrier();
+ }
+}
+
+/*
+ * Command prep helpers
+ */
+static inline void io_uring_sqe_set_data(struct io_uring_sqe *sqe, void *data)
+{
+ sqe->user_data = (unsigned long) data;
+}
+
+static inline void *io_uring_cqe_get_data(struct io_uring_cqe *cqe)
+{
+ return (void *) (uintptr_t) cqe->user_data;
+}
+
+static inline void io_uring_prep_rw(int op, struct io_uring_sqe *sqe, int fd,
+ const void *addr, unsigned len,
+ off_t offset)
+{
+ memset(sqe, 0, sizeof(*sqe));
+ sqe->opcode = op;
+ sqe->fd = fd;
+ sqe->off = offset;
+ sqe->addr = (unsigned long) addr;
+ sqe->len = len;
+}
+
+static inline void io_uring_prep_readv(struct io_uring_sqe *sqe, int fd,
+ const struct iovec *iovecs,
+ unsigned nr_vecs, off_t offset)
+{
+ io_uring_prep_rw(IORING_OP_READV, sqe, fd, iovecs, nr_vecs, offset);
+}
+
+static inline void io_uring_prep_read_fixed(struct io_uring_sqe *sqe, int fd,
+ void *buf, unsigned nbytes,
+ off_t offset)
+{
+ io_uring_prep_rw(IORING_OP_READ_FIXED, sqe, fd, buf, nbytes, offset);
+}
+
+static inline void io_uring_prep_writev(struct io_uring_sqe *sqe, int fd,
+ const struct iovec *iovecs,
+ unsigned nr_vecs, off_t offset)
+{
+ io_uring_prep_rw(IORING_OP_WRITEV, sqe, fd, iovecs, nr_vecs, offset);
+}
+
+static inline void io_uring_prep_write_fixed(struct io_uring_sqe *sqe, int fd,
+ const void *buf, unsigned nbytes,
+ off_t offset)
+{
+ io_uring_prep_rw(IORING_OP_WRITE_FIXED, sqe, fd, buf, nbytes, offset);
+}
+
+static inline void io_uring_prep_poll_add(struct io_uring_sqe *sqe, int fd,
+ short poll_mask)
+{
+ memset(sqe, 0, sizeof(*sqe));
+ sqe->opcode = IORING_OP_POLL_ADD;
+ sqe->fd = fd;
+ sqe->poll_events = poll_mask;
+}
+
+static inline void io_uring_prep_poll_remove(struct io_uring_sqe *sqe,
+ void *user_data)
+{
+ memset(sqe, 0, sizeof(*sqe));
+ sqe->opcode = IORING_OP_POLL_REMOVE;
+ sqe->addr = (unsigned long) user_data;
+}
+
+static inline void io_uring_prep_fsync(struct io_uring_sqe *sqe, int fd,
+ unsigned fsync_flags)
+{
+ memset(sqe, 0, sizeof(*sqe));
+ sqe->opcode = IORING_OP_FSYNC;
+ sqe->fd = fd;
+ sqe->fsync_flags = fsync_flags;
+}
+
+static inline void io_uring_prep_nop(struct io_uring_sqe *sqe)
+{
+ memset(sqe, 0, sizeof(*sqe));
+ sqe->opcode = IORING_OP_NOP;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif