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-rw-r--r--net/iucv/Kconfig15
-rw-r--r--net/iucv/Makefile6
-rw-r--r--net/iucv/af_iucv.c1077
-rw-r--r--net/iucv/iucv.c1619
4 files changed, 2717 insertions, 0 deletions
diff --git a/net/iucv/Kconfig b/net/iucv/Kconfig
new file mode 100644
index 000000000000..f8fcc3d10327
--- /dev/null
+++ b/net/iucv/Kconfig
@@ -0,0 +1,15 @@
+config IUCV
+ tristate "IUCV support (VM only)"
+ depends on S390
+ help
+ Select this option if you want to use inter-user communication under
+ VM or VIF sockets. If you run on z/VM, say "Y" to enable a fast
+ communication link between VM guests.
+
+config AFIUCV
+ tristate "AF_IUCV support (VM only)"
+ depends on IUCV
+ help
+ Select this option if you want to use inter-user communication under
+ VM or VIF sockets. If you run on z/VM, say "Y" to enable a fast
+ communication link between VM guests.
diff --git a/net/iucv/Makefile b/net/iucv/Makefile
new file mode 100644
index 000000000000..7bfdc8532675
--- /dev/null
+++ b/net/iucv/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for IUCV
+#
+
+obj-$(CONFIG_IUCV) += iucv.o
+obj-$(CONFIG_AFIUCV) += af_iucv.o
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
new file mode 100644
index 000000000000..acc94214bde6
--- /dev/null
+++ b/net/iucv/af_iucv.c
@@ -0,0 +1,1077 @@
+/*
+ * linux/net/iucv/af_iucv.c
+ *
+ * IUCV protocol stack for Linux on zSeries
+ *
+ * Copyright 2006 IBM Corporation
+ *
+ * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <net/sock.h>
+#include <asm/ebcdic.h>
+#include <asm/cpcmd.h>
+#include <linux/kmod.h>
+
+#include <net/iucv/iucv.h>
+#include <net/iucv/af_iucv.h>
+
+#define CONFIG_IUCV_SOCK_DEBUG 1
+
+#define IPRMDATA 0x80
+#define VERSION "1.0"
+
+static char iucv_userid[80];
+
+static struct proto_ops iucv_sock_ops;
+
+static struct proto iucv_proto = {
+ .name = "AF_IUCV",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct iucv_sock),
+};
+
+/* Call Back functions */
+static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
+static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
+static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
+static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], u8 ipuser[16]);
+static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
+
+static struct iucv_sock_list iucv_sk_list = {
+ .lock = RW_LOCK_UNLOCKED,
+ .autobind_name = ATOMIC_INIT(0)
+};
+
+static struct iucv_handler af_iucv_handler = {
+ .path_pending = iucv_callback_connreq,
+ .path_complete = iucv_callback_connack,
+ .path_severed = iucv_callback_connrej,
+ .message_pending = iucv_callback_rx,
+ .message_complete = iucv_callback_txdone
+};
+
+static inline void high_nmcpy(unsigned char *dst, char *src)
+{
+ memcpy(dst, src, 8);
+}
+
+static inline void low_nmcpy(unsigned char *dst, char *src)
+{
+ memcpy(&dst[8], src, 8);
+}
+
+/* Timers */
+static void iucv_sock_timeout(unsigned long arg)
+{
+ struct sock *sk = (struct sock *)arg;
+
+ bh_lock_sock(sk);
+ sk->sk_err = ETIMEDOUT;
+ sk->sk_state_change(sk);
+ bh_unlock_sock(sk);
+
+ iucv_sock_kill(sk);
+ sock_put(sk);
+}
+
+static void iucv_sock_clear_timer(struct sock *sk)
+{
+ sk_stop_timer(sk, &sk->sk_timer);
+}
+
+static void iucv_sock_init_timer(struct sock *sk)
+{
+ init_timer(&sk->sk_timer);
+ sk->sk_timer.function = iucv_sock_timeout;
+ sk->sk_timer.data = (unsigned long)sk;
+}
+
+static struct sock *__iucv_get_sock_by_name(char *nm)
+{
+ struct sock *sk;
+ struct hlist_node *node;
+
+ sk_for_each(sk, node, &iucv_sk_list.head)
+ if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
+ return sk;
+
+ return NULL;
+}
+
+static void iucv_sock_destruct(struct sock *sk)
+{
+ skb_queue_purge(&sk->sk_receive_queue);
+ skb_queue_purge(&sk->sk_write_queue);
+}
+
+/* Cleanup Listen */
+static void iucv_sock_cleanup_listen(struct sock *parent)
+{
+ struct sock *sk;
+
+ /* Close non-accepted connections */
+ while ((sk = iucv_accept_dequeue(parent, NULL))) {
+ iucv_sock_close(sk);
+ iucv_sock_kill(sk);
+ }
+
+ parent->sk_state = IUCV_CLOSED;
+ sock_set_flag(parent, SOCK_ZAPPED);
+}
+
+/* Kill socket */
+static void iucv_sock_kill(struct sock *sk)
+{
+ if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
+ return;
+
+ iucv_sock_unlink(&iucv_sk_list, sk);
+ sock_set_flag(sk, SOCK_DEAD);
+ sock_put(sk);
+}
+
+/* Close an IUCV socket */
+static void iucv_sock_close(struct sock *sk)
+{
+ unsigned char user_data[16];
+ struct iucv_sock *iucv = iucv_sk(sk);
+ int err;
+
+ iucv_sock_clear_timer(sk);
+ lock_sock(sk);
+
+ switch(sk->sk_state) {
+ case IUCV_LISTEN:
+ iucv_sock_cleanup_listen(sk);
+ break;
+
+ case IUCV_CONNECTED:
+ case IUCV_DISCONN:
+ err = 0;
+ if (iucv->path) {
+ low_nmcpy(user_data, iucv->src_name);
+ high_nmcpy(user_data, iucv->dst_name);
+ ASCEBC(user_data, sizeof(user_data));
+ err = iucv_path_sever(iucv->path, user_data);
+ iucv_path_free(iucv->path);
+ iucv->path = NULL;
+ }
+
+ sk->sk_state = IUCV_CLOSED;
+ sk->sk_state_change(sk);
+ sk->sk_err = ECONNRESET;
+ sk->sk_state_change(sk);
+
+ skb_queue_purge(&iucv->send_skb_q);
+
+ sock_set_flag(sk, SOCK_ZAPPED);
+ break;
+
+ default:
+ sock_set_flag(sk, SOCK_ZAPPED);
+ break;
+ };
+
+ release_sock(sk);
+ iucv_sock_kill(sk);
+}
+
+static void iucv_sock_init(struct sock *sk, struct sock *parent)
+{
+ if (parent)
+ sk->sk_type = parent->sk_type;
+}
+
+static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
+{
+ struct sock *sk;
+
+ sk = sk_alloc(PF_IUCV, prio, &iucv_proto, 1);
+ if (!sk)
+ return NULL;
+
+ sock_init_data(sock, sk);
+ INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
+ skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
+ iucv_sk(sk)->send_tag = 0;
+
+ sk->sk_destruct = iucv_sock_destruct;
+ sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
+ sk->sk_allocation = GFP_DMA;
+
+ sock_reset_flag(sk, SOCK_ZAPPED);
+
+ sk->sk_protocol = proto;
+ sk->sk_state = IUCV_OPEN;
+
+ iucv_sock_init_timer(sk);
+
+ iucv_sock_link(&iucv_sk_list, sk);
+ return sk;
+}
+
+/* Create an IUCV socket */
+static int iucv_sock_create(struct socket *sock, int protocol)
+{
+ struct sock *sk;
+
+ if (sock->type != SOCK_STREAM)
+ return -ESOCKTNOSUPPORT;
+
+ sock->state = SS_UNCONNECTED;
+ sock->ops = &iucv_sock_ops;
+
+ sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
+ if (!sk)
+ return -ENOMEM;
+
+ iucv_sock_init(sk, NULL);
+
+ return 0;
+}
+
+void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
+{
+ write_lock_bh(&l->lock);
+ sk_add_node(sk, &l->head);
+ write_unlock_bh(&l->lock);
+}
+
+void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
+{
+ write_lock_bh(&l->lock);
+ sk_del_node_init(sk);
+ write_unlock_bh(&l->lock);
+}
+
+void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
+{
+ sock_hold(sk);
+ list_add_tail(&iucv_sk(sk)->accept_q, &iucv_sk(parent)->accept_q);
+ iucv_sk(sk)->parent = parent;
+ parent->sk_ack_backlog++;
+}
+
+void iucv_accept_unlink(struct sock *sk)
+{
+ list_del_init(&iucv_sk(sk)->accept_q);
+ iucv_sk(sk)->parent->sk_ack_backlog--;
+ iucv_sk(sk)->parent = NULL;
+ sock_put(sk);
+}
+
+struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
+{
+ struct iucv_sock *isk, *n;
+ struct sock *sk;
+
+ list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q){
+ sk = (struct sock *) isk;
+ lock_sock(sk);
+
+ if (sk->sk_state == IUCV_CLOSED) {
+ release_sock(sk);
+ iucv_accept_unlink(sk);
+ continue;
+ }
+
+ if (sk->sk_state == IUCV_CONNECTED ||
+ sk->sk_state == IUCV_SEVERED ||
+ !newsock) {
+ iucv_accept_unlink(sk);
+ if (newsock)
+ sock_graft(sk, newsock);
+
+ if (sk->sk_state == IUCV_SEVERED)
+ sk->sk_state = IUCV_DISCONN;
+
+ release_sock(sk);
+ return sk;
+ }
+
+ release_sock(sk);
+ }
+ return NULL;
+}
+
+int iucv_sock_wait_state(struct sock *sk, int state, int state2,
+ unsigned long timeo)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ int err = 0;
+
+ add_wait_queue(sk->sk_sleep, &wait);
+ while (sk->sk_state != state && sk->sk_state != state2) {
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ if (!timeo) {
+ err = -EAGAIN;
+ break;
+ }
+
+ if (signal_pending(current)) {
+ err = sock_intr_errno(timeo);
+ break;
+ }
+
+ release_sock(sk);
+ timeo = schedule_timeout(timeo);
+ lock_sock(sk);
+
+ err = sock_error(sk);
+ if (err)
+ break;
+ }
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(sk->sk_sleep, &wait);
+ return err;
+}
+
+/* Bind an unbound socket */
+static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
+ int addr_len)
+{
+ struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
+ struct sock *sk = sock->sk;
+ struct iucv_sock *iucv;
+ int err;
+
+ /* Verify the input sockaddr */
+ if (!addr || addr->sa_family != AF_IUCV)
+ return -EINVAL;
+
+ lock_sock(sk);
+ if (sk->sk_state != IUCV_OPEN) {
+ err = -EBADFD;
+ goto done;
+ }
+
+ write_lock_bh(&iucv_sk_list.lock);
+
+ iucv = iucv_sk(sk);
+ if (__iucv_get_sock_by_name(sa->siucv_name)) {
+ err = -EADDRINUSE;
+ goto done_unlock;
+ }
+ if (iucv->path) {
+ err = 0;
+ goto done_unlock;
+ }
+
+ /* Bind the socket */
+ memcpy(iucv->src_name, sa->siucv_name, 8);
+
+ /* Copy the user id */
+ memcpy(iucv->src_user_id, iucv_userid, 8);
+ sk->sk_state = IUCV_BOUND;
+ err = 0;
+
+done_unlock:
+ /* Release the socket list lock */
+ write_unlock_bh(&iucv_sk_list.lock);
+done:
+ release_sock(sk);
+ return err;
+}
+
+/* Automatically bind an unbound socket */
+static int iucv_sock_autobind(struct sock *sk)
+{
+ struct iucv_sock *iucv = iucv_sk(sk);
+ char query_buffer[80];
+ char name[12];
+ int err = 0;
+
+ /* Set the userid and name */
+ cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
+ if (unlikely(err))
+ return -EPROTO;
+
+ memcpy(iucv->src_user_id, query_buffer, 8);
+
+ write_lock_bh(&iucv_sk_list.lock);
+
+ sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
+ while (__iucv_get_sock_by_name(name)) {
+ sprintf(name, "%08x",
+ atomic_inc_return(&iucv_sk_list.autobind_name));
+ }
+
+ write_unlock_bh(&iucv_sk_list.lock);
+
+ memcpy(&iucv->src_name, name, 8);
+
+ return err;
+}
+
+/* Connect an unconnected socket */
+static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
+ int alen, int flags)
+{
+ struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
+ struct sock *sk = sock->sk;
+ struct iucv_sock *iucv;
+ unsigned char user_data[16];
+ int err;
+
+ if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
+ return -EINVAL;
+
+ if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
+ return -EBADFD;
+
+ if (sk->sk_type != SOCK_STREAM)
+ return -EINVAL;
+
+ iucv = iucv_sk(sk);
+
+ if (sk->sk_state == IUCV_OPEN) {
+ err = iucv_sock_autobind(sk);
+ if (unlikely(err))
+ return err;
+ }
+
+ lock_sock(sk);
+
+ /* Set the destination information */
+ memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8);
+ memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8);
+
+ high_nmcpy(user_data, sa->siucv_name);
+ low_nmcpy(user_data, iucv_sk(sk)->src_name);
+ ASCEBC(user_data, sizeof(user_data));
+
+ iucv = iucv_sk(sk);
+ /* Create path. */
+ iucv->path = iucv_path_alloc(IUCV_QUEUELEN_DEFAULT,
+ IPRMDATA, GFP_KERNEL);
+ err = iucv_path_connect(iucv->path, &af_iucv_handler,
+ sa->siucv_user_id, NULL, user_data, sk);
+ if (err) {
+ iucv_path_free(iucv->path);
+ iucv->path = NULL;
+ err = -ECONNREFUSED;
+ goto done;
+ }
+
+ if (sk->sk_state != IUCV_CONNECTED) {
+ err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN,
+ sock_sndtimeo(sk, flags & O_NONBLOCK));
+ }
+
+ if (sk->sk_state == IUCV_DISCONN) {
+ release_sock(sk);
+ return -ECONNREFUSED;
+ }
+done:
+ release_sock(sk);
+ return err;
+}
+
+/* Move a socket into listening state. */
+static int iucv_sock_listen(struct socket *sock, int backlog)
+{
+ struct sock *sk = sock->sk;
+ int err;
+
+ lock_sock(sk);
+
+ err = -EINVAL;
+ if (sk->sk_state != IUCV_BOUND || sock->type != SOCK_STREAM)
+ goto done;
+
+ sk->sk_max_ack_backlog = backlog;
+ sk->sk_ack_backlog = 0;
+ sk->sk_state = IUCV_LISTEN;
+ err = 0;
+
+done:
+ release_sock(sk);
+ return err;
+}
+
+/* Accept a pending connection */
+static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
+ int flags)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ struct sock *sk = sock->sk, *nsk;
+ long timeo;
+ int err = 0;
+
+ lock_sock(sk);
+
+ if (sk->sk_state != IUCV_LISTEN) {
+ err = -EBADFD;
+ goto done;
+ }
+
+ timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
+
+ /* Wait for an incoming connection */
+ add_wait_queue_exclusive(sk->sk_sleep, &wait);
+ while (!(nsk = iucv_accept_dequeue(sk, newsock))){
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (!timeo) {
+ err = -EAGAIN;
+ break;
+ }
+
+ release_sock(sk);
+ timeo = schedule_timeout(timeo);
+ lock_sock(sk);
+
+ if (sk->sk_state != IUCV_LISTEN) {
+ err = -EBADFD;
+ break;
+ }
+
+ if (signal_pending(current)) {
+ err = sock_intr_errno(timeo);
+ break;
+ }
+ }
+
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(sk->sk_sleep, &wait);
+
+ if (err)
+ goto done;
+
+ newsock->state = SS_CONNECTED;
+
+done:
+ release_sock(sk);
+ return err;
+}
+
+static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
+ int *len, int peer)
+{
+ struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
+ struct sock *sk = sock->sk;
+
+ addr->sa_family = AF_IUCV;
+ *len = sizeof(struct sockaddr_iucv);
+
+ if (peer) {
+ memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
+ memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
+ } else {
+ memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
+ memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
+ }
+ memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
+ memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
+ memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
+
+ return 0;
+}
+
+static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
+ struct msghdr *msg, size_t len)
+{
+ struct sock *sk = sock->sk;
+ struct iucv_sock *iucv = iucv_sk(sk);
+ struct sk_buff *skb;
+ struct iucv_message txmsg;
+ int err;
+
+ err = sock_error(sk);
+ if (err)
+ return err;
+
+ if (msg->msg_flags & MSG_OOB)
+ return -EOPNOTSUPP;
+
+ lock_sock(sk);
+
+ if (sk->sk_shutdown & SEND_SHUTDOWN) {
+ err = -EPIPE;
+ goto out;
+ }
+
+ if (sk->sk_state == IUCV_CONNECTED){
+ if(!(skb = sock_alloc_send_skb(sk, len,
+ msg->msg_flags & MSG_DONTWAIT,
+ &err)))
+ return err;
+
+ if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)){
+ err = -EFAULT;
+ goto fail;
+ }
+
+ txmsg.class = 0;
+ txmsg.tag = iucv->send_tag++;
+ memcpy(skb->cb, &txmsg.tag, 4);
+ skb_queue_tail(&iucv->send_skb_q, skb);
+ err = iucv_message_send(iucv->path, &txmsg, 0, 0,
+ (void *) skb->data, skb->len);
+ if (err) {
+ if (err == 3)
+ printk(KERN_ERR "AF_IUCV msg limit exceeded\n");
+ skb_unlink(skb, &iucv->send_skb_q);
+ err = -EPIPE;
+ goto fail;
+ }
+
+ } else {
+ err = -ENOTCONN;
+ goto out;
+ }
+
+ release_sock(sk);
+ return len;
+
+fail:
+ kfree_skb(skb);
+out:
+ release_sock(sk);
+ return err;
+}
+
+static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
+ struct msghdr *msg, size_t len, int flags)
+{
+ int noblock = flags & MSG_DONTWAIT;
+ struct sock *sk = sock->sk;
+ int target, copied = 0;
+ struct sk_buff *skb;
+ int err = 0;
+
+ if (flags & (MSG_OOB))
+ return -EOPNOTSUPP;
+
+ target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
+
+ skb = skb_recv_datagram(sk, flags, noblock, &err);
+ if (!skb) {
+ if (sk->sk_shutdown & RCV_SHUTDOWN)
+ return 0;
+ return err;
+ }
+
+ copied = min_t(unsigned int, skb->len, len);
+
+ if (memcpy_toiovec(msg->msg_iov, skb->data, copied)) {
+ skb_queue_head(&sk->sk_receive_queue, skb);
+ if (copied == 0)
+ return -EFAULT;
+ }
+
+ len -= copied;
+
+ /* Mark read part of skb as used */
+ if (!(flags & MSG_PEEK)) {
+ skb_pull(skb, copied);
+
+ if (skb->len) {
+ skb_queue_head(&sk->sk_receive_queue, skb);
+ goto done;
+ }
+
+ kfree_skb(skb);
+ } else
+ skb_queue_head(&sk->sk_receive_queue, skb);
+
+done:
+ return err ? : copied;
+}
+
+static inline unsigned int iucv_accept_poll(struct sock *parent)
+{
+ struct iucv_sock *isk, *n;
+ struct sock *sk;
+
+ list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q){
+ sk = (struct sock *) isk;
+
+ if (sk->sk_state == IUCV_CONNECTED)
+ return POLLIN | POLLRDNORM;
+ }
+
+ return 0;
+}
+
+unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
+ poll_table *wait)
+{
+ struct sock *sk = sock->sk;
+ unsigned int mask = 0;
+
+ poll_wait(file, sk->sk_sleep, wait);
+
+ if (sk->sk_state == IUCV_LISTEN)
+ return iucv_accept_poll(sk);
+
+ if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
+ mask |= POLLERR;
+
+ if (sk->sk_shutdown & RCV_SHUTDOWN)
+ mask |= POLLRDHUP;
+
+ if (sk->sk_shutdown == SHUTDOWN_MASK)
+ mask |= POLLHUP;
+
+ if (!skb_queue_empty(&sk->sk_receive_queue) ||
+ (sk->sk_shutdown & RCV_SHUTDOWN))
+ mask |= POLLIN | POLLRDNORM;
+
+ if (sk->sk_state == IUCV_CLOSED)
+ mask |= POLLHUP;
+
+ if (sock_writeable(sk))
+ mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
+ else
+ set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
+
+ return mask;
+}
+
+static int iucv_sock_shutdown(struct socket *sock, int how)
+{
+ struct sock *sk = sock->sk;
+ struct iucv_sock *iucv = iucv_sk(sk);
+ struct iucv_message txmsg;
+ int err = 0;
+ u8 prmmsg[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
+
+ how++;
+
+ if ((how & ~SHUTDOWN_MASK) || !how)
+ return -EINVAL;
+
+ lock_sock(sk);
+ switch(sk->sk_state) {
+ case IUCV_CLOSED:
+ err = -ENOTCONN;
+ goto fail;
+
+ default:
+ sk->sk_shutdown |= how;
+ break;
+ }
+
+ if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
+ txmsg.class = 0;
+ txmsg.tag = 0;
+ err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
+ (void *) prmmsg, 8);
+ if (err) {
+ switch(err) {
+ case 1:
+ err = -ENOTCONN;
+ break;
+ case 2:
+ err = -ECONNRESET;
+ break;
+ default:
+ err = -ENOTCONN;
+ break;
+ }
+ }
+ }
+
+ if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
+ err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
+ if (err)
+ err = -ENOTCONN;
+
+ skb_queue_purge(&sk->sk_receive_queue);
+ }
+
+ /* Wake up anyone sleeping in poll */
+ sk->sk_state_change(sk);
+
+fail:
+ release_sock(sk);
+ return err;
+}
+
+static int iucv_sock_release(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+ int err = 0;
+
+ if (!sk)
+ return 0;
+
+ iucv_sock_close(sk);
+
+ /* Unregister with IUCV base support */
+ if (iucv_sk(sk)->path) {
+ iucv_path_sever(iucv_sk(sk)->path, NULL);
+ iucv_path_free(iucv_sk(sk)->path);
+ iucv_sk(sk)->path = NULL;
+ }
+
+ if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime){
+ lock_sock(sk);
+ err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0,
+ sk->sk_lingertime);
+ release_sock(sk);
+ }
+
+ sock_orphan(sk);
+ iucv_sock_kill(sk);
+ return err;
+}
+
+/* Callback wrappers - called from iucv base support */
+static int iucv_callback_connreq(struct iucv_path *path,
+ u8 ipvmid[8], u8 ipuser[16])
+{
+ unsigned char user_data[16];
+ unsigned char nuser_data[16];
+ unsigned char src_name[8];
+ struct hlist_node *node;
+ struct sock *sk, *nsk;
+ struct iucv_sock *iucv, *niucv;
+ int err;
+
+ memcpy(src_name, ipuser, 8);
+ EBCASC(src_name, 8);
+ /* Find out if this path belongs to af_iucv. */
+ read_lock(&iucv_sk_list.lock);
+ iucv = NULL;
+ sk_for_each(sk, node, &iucv_sk_list.head)
+ if (sk->sk_state == IUCV_LISTEN &&
+ !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
+ /*
+ * Found a listening socket with
+ * src_name == ipuser[0-7].
+ */
+ iucv = iucv_sk(sk);
+ break;
+ }
+ read_unlock(&iucv_sk_list.lock);
+ if (!iucv)
+ /* No socket found, not one of our paths. */
+ return -EINVAL;
+
+ bh_lock_sock(sk);
+
+ /* Check if parent socket is listening */
+ low_nmcpy(user_data, iucv->src_name);
+ high_nmcpy(user_data, iucv->dst_name);
+ ASCEBC(user_data, sizeof(user_data));
+ if (sk->sk_state != IUCV_LISTEN) {
+ err = iucv_path_sever(path, user_data);
+ goto fail;
+ }
+
+ /* Check for backlog size */
+ if (sk_acceptq_is_full(sk)) {
+ err = iucv_path_sever(path, user_data);
+ goto fail;
+ }
+
+ /* Create the new socket */
+ nsk = iucv_sock_alloc(NULL, SOCK_STREAM, GFP_ATOMIC);
+ if (!nsk){
+ err = iucv_path_sever(path, user_data);
+ goto fail;
+ }
+
+ niucv = iucv_sk(nsk);
+ iucv_sock_init(nsk, sk);
+
+ /* Set the new iucv_sock */
+ memcpy(niucv->dst_name, ipuser + 8, 8);
+ EBCASC(niucv->dst_name, 8);
+ memcpy(niucv->dst_user_id, ipvmid, 8);
+ memcpy(niucv->src_name, iucv->src_name, 8);
+ memcpy(niucv->src_user_id, iucv->src_user_id, 8);
+ niucv->path = path;
+
+ /* Call iucv_accept */
+ high_nmcpy(nuser_data, ipuser + 8);
+ memcpy(nuser_data + 8, niucv->src_name, 8);
+ ASCEBC(nuser_data + 8, 8);
+
+ path->msglim = IUCV_QUEUELEN_DEFAULT;
+ err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
+ if (err){
+ err = iucv_path_sever(path, user_data);
+ goto fail;
+ }
+
+ iucv_accept_enqueue(sk, nsk);
+
+ /* Wake up accept */
+ nsk->sk_state = IUCV_CONNECTED;
+ sk->sk_data_ready(sk, 1);
+ err = 0;
+fail:
+ bh_unlock_sock(sk);
+ return 0;
+}
+
+static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
+{
+ struct sock *sk = path->private;
+
+ sk->sk_state = IUCV_CONNECTED;
+ sk->sk_state_change(sk);
+}
+
+static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
+{
+ struct sock *sk = path->private;
+ struct sk_buff *skb;
+ int rc;
+
+ if (sk->sk_shutdown & RCV_SHUTDOWN)
+ return;
+
+ skb = alloc_skb(msg->length, GFP_ATOMIC | GFP_DMA);
+ if (!skb) {
+ iucv_message_reject(path, msg);
+ return;
+ }
+
+ if (msg->flags & IPRMDATA) {
+ skb->data = NULL;
+ skb->len = 0;
+ } else {
+ rc = iucv_message_receive(path, msg, 0, skb->data,
+ msg->length, NULL);
+ if (rc) {
+ kfree_skb(skb);
+ return;
+ }
+
+ skb->h.raw = skb->data;
+ skb->nh.raw = skb->data;
+ skb->len = msg->length;
+ }
+
+ if (sock_queue_rcv_skb(sk, skb))
+ kfree_skb(skb);
+}
+
+static void iucv_callback_txdone(struct iucv_path *path,
+ struct iucv_message *msg)
+{
+ struct sock *sk = path->private;
+ struct sk_buff *this;
+ struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
+ struct sk_buff *list_skb = list->next;
+ unsigned long flags;
+
+ spin_lock_irqsave(&list->lock, flags);
+
+ do {
+ this = list_skb;
+ list_skb = list_skb->next;
+ } while (memcmp(&msg->tag, this->cb, 4));
+
+ spin_unlock_irqrestore(&list->lock, flags);
+
+ skb_unlink(this, &iucv_sk(sk)->send_skb_q);
+ kfree_skb(this);
+}
+
+static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
+{
+ struct sock *sk = path->private;
+
+ if (!list_empty(&iucv_sk(sk)->accept_q))
+ sk->sk_state = IUCV_SEVERED;
+ else
+ sk->sk_state = IUCV_DISCONN;
+
+ sk->sk_state_change(sk);
+}
+
+static struct proto_ops iucv_sock_ops = {
+ .family = PF_IUCV,
+ .owner = THIS_MODULE,
+ .release = iucv_sock_release,
+ .bind = iucv_sock_bind,
+ .connect = iucv_sock_connect,
+ .listen = iucv_sock_listen,
+ .accept = iucv_sock_accept,
+ .getname = iucv_sock_getname,
+ .sendmsg = iucv_sock_sendmsg,
+ .recvmsg = iucv_sock_recvmsg,
+ .poll = iucv_sock_poll,
+ .ioctl = sock_no_ioctl,
+ .mmap = sock_no_mmap,
+ .socketpair = sock_no_socketpair,
+ .shutdown = iucv_sock_shutdown,
+ .setsockopt = sock_no_setsockopt,
+ .getsockopt = sock_no_getsockopt
+};
+
+static struct net_proto_family iucv_sock_family_ops = {
+ .family = AF_IUCV,
+ .owner = THIS_MODULE,
+ .create = iucv_sock_create,
+};
+
+static int afiucv_init(void)
+{
+ int err;
+
+ if (!MACHINE_IS_VM) {
+ printk(KERN_ERR "AF_IUCV connection needs VM as base\n");
+ err = -EPROTONOSUPPORT;
+ goto out;
+ }
+ cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
+ if (unlikely(err)) {
+ printk(KERN_ERR "AF_IUCV needs the VM userid\n");
+ err = -EPROTONOSUPPORT;
+ goto out;
+ }
+
+ err = iucv_register(&af_iucv_handler, 0);
+ if (err)
+ goto out;
+ err = proto_register(&iucv_proto, 0);
+ if (err)
+ goto out_iucv;
+ err = sock_register(&iucv_sock_family_ops);
+ if (err)
+ goto out_proto;
+ printk(KERN_INFO "AF_IUCV lowlevel driver initialized\n");
+ return 0;
+
+out_proto:
+ proto_unregister(&iucv_proto);
+out_iucv:
+ iucv_unregister(&af_iucv_handler, 0);
+out:
+ return err;
+}
+
+static void __exit afiucv_exit(void)
+{
+ sock_unregister(PF_IUCV);
+ proto_unregister(&iucv_proto);
+ iucv_unregister(&af_iucv_handler, 0);
+
+ printk(KERN_INFO "AF_IUCV lowlevel driver unloaded\n");
+}
+
+module_init(afiucv_init);
+module_exit(afiucv_exit);
+
+MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
+MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NETPROTO(PF_IUCV);
diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c
new file mode 100644
index 000000000000..1b10d576f222
--- /dev/null
+++ b/net/iucv/iucv.c
@@ -0,0 +1,1619 @@
+/*
+ * IUCV base infrastructure.
+ *
+ * Copyright 2001, 2006 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s):
+ * Original source:
+ * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
+ * Xenia Tkatschow (xenia@us.ibm.com)
+ * 2Gb awareness and general cleanup:
+ * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
+ * Rewritten for af_iucv:
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ *
+ * Documentation used:
+ * The original source
+ * CP Programming Service, IBM document # SC24-5760
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+
+#include <linux/spinlock.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/cpu.h>
+#include <net/iucv/iucv.h>
+#include <asm/atomic.h>
+#include <asm/ebcdic.h>
+#include <asm/io.h>
+#include <asm/s390_ext.h>
+#include <asm/s390_rdev.h>
+#include <asm/smp.h>
+
+/*
+ * FLAGS:
+ * All flags are defined in the field IPFLAGS1 of each function
+ * and can be found in CP Programming Services.
+ * IPSRCCLS - Indicates you have specified a source class.
+ * IPTRGCLS - Indicates you have specified a target class.
+ * IPFGPID - Indicates you have specified a pathid.
+ * IPFGMID - Indicates you have specified a message ID.
+ * IPNORPY - Indicates a one-way message. No reply expected.
+ * IPALL - Indicates that all paths are affected.
+ */
+#define IUCV_IPSRCCLS 0x01
+#define IUCV_IPTRGCLS 0x01
+#define IUCV_IPFGPID 0x02
+#define IUCV_IPFGMID 0x04
+#define IUCV_IPNORPY 0x10
+#define IUCV_IPALL 0x80
+
+static int iucv_bus_match (struct device *dev, struct device_driver *drv)
+{
+ return 0;
+}
+
+struct bus_type iucv_bus = {
+ .name = "iucv",
+ .match = iucv_bus_match,
+};
+
+struct device *iucv_root;
+static int iucv_available;
+
+/* General IUCV interrupt structure */
+struct iucv_irq_data {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iptype;
+ u32 res2[8];
+};
+
+struct iucv_work {
+ struct list_head list;
+ struct iucv_irq_data data;
+};
+
+static LIST_HEAD(iucv_work_queue);
+static DEFINE_SPINLOCK(iucv_work_lock);
+
+static struct iucv_irq_data *iucv_irq_data;
+static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE;
+static cpumask_t iucv_irq_cpumask = CPU_MASK_NONE;
+
+static void iucv_tasklet_handler(unsigned long);
+static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_handler,0);
+
+enum iucv_command_codes {
+ IUCV_QUERY = 0,
+ IUCV_RETRIEVE_BUFFER = 2,
+ IUCV_SEND = 4,
+ IUCV_RECEIVE = 5,
+ IUCV_REPLY = 6,
+ IUCV_REJECT = 8,
+ IUCV_PURGE = 9,
+ IUCV_ACCEPT = 10,
+ IUCV_CONNECT = 11,
+ IUCV_DECLARE_BUFFER = 12,
+ IUCV_QUIESCE = 13,
+ IUCV_RESUME = 14,
+ IUCV_SEVER = 15,
+ IUCV_SETMASK = 16,
+};
+
+/*
+ * Error messages that are used with the iucv_sever function. They get
+ * converted to EBCDIC.
+ */
+static char iucv_error_no_listener[16] = "NO LISTENER";
+static char iucv_error_no_memory[16] = "NO MEMORY";
+static char iucv_error_pathid[16] = "INVALID PATHID";
+
+/*
+ * iucv_handler_list: List of registered handlers.
+ */
+static LIST_HEAD(iucv_handler_list);
+
+/*
+ * iucv_path_table: an array of iucv_path structures.
+ */
+static struct iucv_path **iucv_path_table;
+static unsigned long iucv_max_pathid;
+
+/*
+ * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
+ */
+static DEFINE_SPINLOCK(iucv_table_lock);
+
+/*
+ * iucv_tasklet_cpu: contains the number of the cpu executing the tasklet.
+ * Needed for iucv_path_sever called from tasklet.
+ */
+static int iucv_tasklet_cpu = -1;
+
+/*
+ * Mutex and wait queue for iucv_register/iucv_unregister.
+ */
+static DEFINE_MUTEX(iucv_register_mutex);
+
+/*
+ * Counter for number of non-smp capable handlers.
+ */
+static int iucv_nonsmp_handler;
+
+/*
+ * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
+ * iucv_path_quiesce and iucv_path_sever.
+ */
+struct iucv_cmd_control {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iprcode;
+ u16 ipmsglim;
+ u16 res1;
+ u8 ipvmid[8];
+ u8 ipuser[16];
+ u8 iptarget[8];
+} __attribute__ ((packed,aligned(8)));
+
+/*
+ * Data in parameter list iucv structure. Used by iucv_message_send,
+ * iucv_message_send2way and iucv_message_reply.
+ */
+struct iucv_cmd_dpl {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iprcode;
+ u32 ipmsgid;
+ u32 iptrgcls;
+ u8 iprmmsg[8];
+ u32 ipsrccls;
+ u32 ipmsgtag;
+ u32 ipbfadr2;
+ u32 ipbfln2f;
+ u32 res;
+} __attribute__ ((packed,aligned(8)));
+
+/*
+ * Data in buffer iucv structure. Used by iucv_message_receive,
+ * iucv_message_reject, iucv_message_send, iucv_message_send2way
+ * and iucv_declare_cpu.
+ */
+struct iucv_cmd_db {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iprcode;
+ u32 ipmsgid;
+ u32 iptrgcls;
+ u32 ipbfadr1;
+ u32 ipbfln1f;
+ u32 ipsrccls;
+ u32 ipmsgtag;
+ u32 ipbfadr2;
+ u32 ipbfln2f;
+ u32 res;
+} __attribute__ ((packed,aligned(8)));
+
+/*
+ * Purge message iucv structure. Used by iucv_message_purge.
+ */
+struct iucv_cmd_purge {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iprcode;
+ u32 ipmsgid;
+ u8 ipaudit[3];
+ u8 res1[5];
+ u32 res2;
+ u32 ipsrccls;
+ u32 ipmsgtag;
+ u32 res3[3];
+} __attribute__ ((packed,aligned(8)));
+
+/*
+ * Set mask iucv structure. Used by iucv_enable_cpu.
+ */
+struct iucv_cmd_set_mask {
+ u8 ipmask;
+ u8 res1[2];
+ u8 iprcode;
+ u32 res2[9];
+} __attribute__ ((packed,aligned(8)));
+
+union iucv_param {
+ struct iucv_cmd_control ctrl;
+ struct iucv_cmd_dpl dpl;
+ struct iucv_cmd_db db;
+ struct iucv_cmd_purge purge;
+ struct iucv_cmd_set_mask set_mask;
+};
+
+/*
+ * Anchor for per-cpu IUCV command parameter block.
+ */
+static union iucv_param *iucv_param;
+
+/**
+ * iucv_call_b2f0
+ * @code: identifier of IUCV call to CP.
+ * @parm: pointer to a struct iucv_parm block
+ *
+ * Calls CP to execute IUCV commands.
+ *
+ * Returns the result of the CP IUCV call.
+ */
+static inline int iucv_call_b2f0(int command, union iucv_param *parm)
+{
+ register unsigned long reg0 asm ("0");
+ register unsigned long reg1 asm ("1");
+ int ccode;
+
+ reg0 = command;
+ reg1 = virt_to_phys(parm);
+ asm volatile(
+ " .long 0xb2f01000\n"
+ " ipm %0\n"
+ " srl %0,28\n"
+ : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
+ : "m" (*parm) : "cc");
+ return (ccode == 1) ? parm->ctrl.iprcode : ccode;
+}
+
+/**
+ * iucv_query_maxconn
+ *
+ * Determines the maximum number of connections that may be established.
+ *
+ * Returns the maximum number of connections or -EPERM is IUCV is not
+ * available.
+ */
+static int iucv_query_maxconn(void)
+{
+ register unsigned long reg0 asm ("0");
+ register unsigned long reg1 asm ("1");
+ void *param;
+ int ccode;
+
+ param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA);
+ if (!param)
+ return -ENOMEM;
+ reg0 = IUCV_QUERY;
+ reg1 = (unsigned long) param;
+ asm volatile (
+ " .long 0xb2f01000\n"
+ " ipm %0\n"
+ " srl %0,28\n"
+ : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
+ if (ccode == 0)
+ iucv_max_pathid = reg0;
+ kfree(param);
+ return ccode ? -EPERM : 0;
+}
+
+/**
+ * iucv_allow_cpu
+ * @data: unused
+ *
+ * Allow iucv interrupts on this cpu.
+ */
+static void iucv_allow_cpu(void *data)
+{
+ int cpu = smp_processor_id();
+ union iucv_param *parm;
+
+ /*
+ * Enable all iucv interrupts.
+ * ipmask contains bits for the different interrupts
+ * 0x80 - Flag to allow nonpriority message pending interrupts
+ * 0x40 - Flag to allow priority message pending interrupts
+ * 0x20 - Flag to allow nonpriority message completion interrupts
+ * 0x10 - Flag to allow priority message completion interrupts
+ * 0x08 - Flag to allow IUCV control interrupts
+ */
+ parm = percpu_ptr(iucv_param, smp_processor_id());
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->set_mask.ipmask = 0xf8;
+ iucv_call_b2f0(IUCV_SETMASK, parm);
+
+ /* Set indication that iucv interrupts are allowed for this cpu. */
+ cpu_set(cpu, iucv_irq_cpumask);
+}
+
+/**
+ * iucv_block_cpu
+ * @data: unused
+ *
+ * Block iucv interrupts on this cpu.
+ */
+static void iucv_block_cpu(void *data)
+{
+ int cpu = smp_processor_id();
+ union iucv_param *parm;
+
+ /* Disable all iucv interrupts. */
+ parm = percpu_ptr(iucv_param, smp_processor_id());
+ memset(parm, 0, sizeof(union iucv_param));
+ iucv_call_b2f0(IUCV_SETMASK, parm);
+
+ /* Clear indication that iucv interrupts are allowed for this cpu. */
+ cpu_clear(cpu, iucv_irq_cpumask);
+}
+
+/**
+ * iucv_declare_cpu
+ * @data: unused
+ *
+ * Declare a interupt buffer on this cpu.
+ */
+static void iucv_declare_cpu(void *data)
+{
+ int cpu = smp_processor_id();
+ union iucv_param *parm;
+ int rc;
+
+ if (cpu_isset(cpu, iucv_buffer_cpumask))
+ return;
+
+ /* Declare interrupt buffer. */
+ parm = percpu_ptr(iucv_param, cpu);
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->db.ipbfadr1 = virt_to_phys(percpu_ptr(iucv_irq_data, cpu));
+ rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
+ if (rc) {
+ char *err = "Unknown";
+ switch(rc) {
+ case 0x03:
+ err = "Directory error";
+ break;
+ case 0x0a:
+ err = "Invalid length";
+ break;
+ case 0x13:
+ err = "Buffer already exists";
+ break;
+ case 0x3e:
+ err = "Buffer overlap";
+ break;
+ case 0x5c:
+ err = "Paging or storage error";
+ break;
+ }
+ printk(KERN_WARNING "iucv_register: iucv_declare_buffer "
+ "on cpu %i returned error 0x%02x (%s)\n", cpu, rc, err);
+ return;
+ }
+
+ /* Set indication that an iucv buffer exists for this cpu. */
+ cpu_set(cpu, iucv_buffer_cpumask);
+
+ if (iucv_nonsmp_handler == 0 || cpus_empty(iucv_irq_cpumask))
+ /* Enable iucv interrupts on this cpu. */
+ iucv_allow_cpu(NULL);
+ else
+ /* Disable iucv interrupts on this cpu. */
+ iucv_block_cpu(NULL);
+}
+
+/**
+ * iucv_retrieve_cpu
+ * @data: unused
+ *
+ * Retrieve interrupt buffer on this cpu.
+ */
+static void iucv_retrieve_cpu(void *data)
+{
+ int cpu = smp_processor_id();
+ union iucv_param *parm;
+
+ if (!cpu_isset(cpu, iucv_buffer_cpumask))
+ return;
+
+ /* Block iucv interrupts. */
+ iucv_block_cpu(NULL);
+
+ /* Retrieve interrupt buffer. */
+ parm = percpu_ptr(iucv_param, cpu);
+ iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
+
+ /* Clear indication that an iucv buffer exists for this cpu. */
+ cpu_clear(cpu, iucv_buffer_cpumask);
+}
+
+/**
+ * iucv_setmask_smp
+ *
+ * Allow iucv interrupts on all cpus.
+ */
+static void iucv_setmask_mp(void)
+{
+ int cpu;
+
+ for_each_online_cpu(cpu)
+ /* Enable all cpus with a declared buffer. */
+ if (cpu_isset(cpu, iucv_buffer_cpumask) &&
+ !cpu_isset(cpu, iucv_irq_cpumask))
+ smp_call_function_on(iucv_allow_cpu, NULL, 0, 1, cpu);
+}
+
+/**
+ * iucv_setmask_up
+ *
+ * Allow iucv interrupts on a single cpus.
+ */
+static void iucv_setmask_up(void)
+{
+ cpumask_t cpumask;
+ int cpu;
+
+ /* Disable all cpu but the first in cpu_irq_cpumask. */
+ cpumask = iucv_irq_cpumask;
+ cpu_clear(first_cpu(iucv_irq_cpumask), cpumask);
+ for_each_cpu_mask(cpu, cpumask)
+ smp_call_function_on(iucv_block_cpu, NULL, 0, 1, cpu);
+}
+
+/**
+ * iucv_enable
+ *
+ * This function makes iucv ready for use. It allocates the pathid
+ * table, declares an iucv interrupt buffer and enables the iucv
+ * interrupts. Called when the first user has registered an iucv
+ * handler.
+ */
+static int iucv_enable(void)
+{
+ size_t alloc_size;
+ int cpu, rc;
+
+ rc = -ENOMEM;
+ alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
+ iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
+ if (!iucv_path_table)
+ goto out;
+ /* Declare per cpu buffers. */
+ rc = -EIO;
+ for_each_online_cpu(cpu)
+ smp_call_function_on(iucv_declare_cpu, NULL, 0, 1, cpu);
+ if (cpus_empty(iucv_buffer_cpumask))
+ /* No cpu could declare an iucv buffer. */
+ goto out_path;
+ return 0;
+
+out_path:
+ kfree(iucv_path_table);
+out:
+ return rc;
+}
+
+/**
+ * iucv_disable
+ *
+ * This function shuts down iucv. It disables iucv interrupts, retrieves
+ * the iucv interrupt buffer and frees the pathid table. Called after the
+ * last user unregister its iucv handler.
+ */
+static void iucv_disable(void)
+{
+ on_each_cpu(iucv_retrieve_cpu, NULL, 0, 1);
+ kfree(iucv_path_table);
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
+ unsigned long action, void *hcpu)
+{
+ cpumask_t cpumask;
+ long cpu = (long) hcpu;
+
+ switch (action) {
+ case CPU_UP_PREPARE:
+ if (!percpu_populate(iucv_irq_data,
+ sizeof(struct iucv_irq_data),
+ GFP_KERNEL|GFP_DMA, cpu))
+ return NOTIFY_BAD;
+ if (!percpu_populate(iucv_param, sizeof(union iucv_param),
+ GFP_KERNEL|GFP_DMA, cpu)) {
+ percpu_depopulate(iucv_irq_data, cpu);
+ return NOTIFY_BAD;
+ }
+ break;
+ case CPU_UP_CANCELED:
+ case CPU_DEAD:
+ percpu_depopulate(iucv_param, cpu);
+ percpu_depopulate(iucv_irq_data, cpu);
+ break;
+ case CPU_ONLINE:
+ case CPU_DOWN_FAILED:
+ smp_call_function_on(iucv_declare_cpu, NULL, 0, 1, cpu);
+ break;
+ case CPU_DOWN_PREPARE:
+ cpumask = iucv_buffer_cpumask;
+ cpu_clear(cpu, cpumask);
+ if (cpus_empty(cpumask))
+ /* Can't offline last IUCV enabled cpu. */
+ return NOTIFY_BAD;
+ smp_call_function_on(iucv_retrieve_cpu, NULL, 0, 1, cpu);
+ if (cpus_empty(iucv_irq_cpumask))
+ smp_call_function_on(iucv_allow_cpu, NULL, 0, 1,
+ first_cpu(iucv_buffer_cpumask));
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block iucv_cpu_notifier = {
+ .notifier_call = iucv_cpu_notify,
+};
+#endif
+
+/**
+ * iucv_sever_pathid
+ * @pathid: path identification number.
+ * @userdata: 16-bytes of user data.
+ *
+ * Sever an iucv path to free up the pathid. Used internally.
+ */
+static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
+{
+ union iucv_param *parm;
+
+ parm = percpu_ptr(iucv_param, smp_processor_id());
+ memset(parm, 0, sizeof(union iucv_param));
+ if (userdata)
+ memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
+ parm->ctrl.ippathid = pathid;
+ return iucv_call_b2f0(IUCV_SEVER, parm);
+}
+
+/**
+ * __iucv_cleanup_pathid
+ * @dummy: unused dummy argument
+ *
+ * Nop function called via smp_call_function to force work items from
+ * pending external iucv interrupts to the work queue.
+ */
+static void __iucv_cleanup_pathid(void *dummy)
+{
+}
+
+/**
+ * iucv_cleanup_pathid
+ * @pathid: 16 bit pathid
+ *
+ * Function called after a path has been severed to find all remaining
+ * work items for the now stale pathid. The caller needs to hold the
+ * iucv_table_lock.
+ */
+static void iucv_cleanup_pathid(u16 pathid)
+{
+ struct iucv_work *p, *n;
+
+ /*
+ * Path is severed, the pathid can be reused immediatly on
+ * a iucv connect or a connection pending interrupt.
+ * iucv_path_connect and connection pending interrupt will
+ * wait until the iucv_table_lock is released before the
+ * recycled pathid enters the system.
+ * Force remaining interrupts to the work queue, then
+ * scan the work queue for items of this path.
+ */
+ smp_call_function(__iucv_cleanup_pathid, NULL, 0, 1);
+ spin_lock_irq(&iucv_work_lock);
+ list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
+ /* Remove work items for pathid except connection pending */
+ if (p->data.ippathid == pathid && p->data.iptype != 0x01) {
+ list_del(&p->list);
+ kfree(p);
+ }
+ }
+ spin_unlock_irq(&iucv_work_lock);
+}
+
+/**
+ * iucv_register:
+ * @handler: address of iucv handler structure
+ * @smp: != 0 indicates that the handler can deal with out of order messages
+ *
+ * Registers a driver with IUCV.
+ *
+ * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
+ * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
+ */
+int iucv_register(struct iucv_handler *handler, int smp)
+{
+ int rc;
+
+ if (!iucv_available)
+ return -ENOSYS;
+ mutex_lock(&iucv_register_mutex);
+ if (!smp)
+ iucv_nonsmp_handler++;
+ if (list_empty(&iucv_handler_list)) {
+ rc = iucv_enable();
+ if (rc)
+ goto out_mutex;
+ } else if (!smp && iucv_nonsmp_handler == 1)
+ iucv_setmask_up();
+ INIT_LIST_HEAD(&handler->paths);
+
+ spin_lock_irq(&iucv_table_lock);
+ list_add_tail(&handler->list, &iucv_handler_list);
+ spin_unlock_irq(&iucv_table_lock);
+ rc = 0;
+out_mutex:
+ mutex_unlock(&iucv_register_mutex);
+ return rc;
+}
+
+/**
+ * iucv_unregister
+ * @handler: address of iucv handler structure
+ * @smp: != 0 indicates that the handler can deal with out of order messages
+ *
+ * Unregister driver from IUCV.
+ */
+void iucv_unregister(struct iucv_handler *handler, int smp)
+{
+ struct iucv_path *p, *n;
+
+ mutex_lock(&iucv_register_mutex);
+ spin_lock_bh(&iucv_table_lock);
+ /* Remove handler from the iucv_handler_list. */
+ list_del_init(&handler->list);
+ /* Sever all pathids still refering to the handler. */
+ list_for_each_entry_safe(p, n, &handler->paths, list) {
+ iucv_sever_pathid(p->pathid, NULL);
+ iucv_path_table[p->pathid] = NULL;
+ list_del(&p->list);
+ iucv_cleanup_pathid(p->pathid);
+ iucv_path_free(p);
+ }
+ spin_unlock_bh(&iucv_table_lock);
+ if (!smp)
+ iucv_nonsmp_handler--;
+ if (list_empty(&iucv_handler_list))
+ iucv_disable();
+ else if (!smp && iucv_nonsmp_handler == 0)
+ iucv_setmask_mp();
+ mutex_unlock(&iucv_register_mutex);
+}
+
+/**
+ * iucv_path_accept
+ * @path: address of iucv path structure
+ * @handler: address of iucv handler structure
+ * @userdata: 16 bytes of data reflected to the communication partner
+ * @private: private data passed to interrupt handlers for this path
+ *
+ * This function is issued after the user received a connection pending
+ * external interrupt and now wishes to complete the IUCV communication path.
+ *
+ * Returns the result of the CP IUCV call.
+ */
+int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
+ u8 userdata[16], void *private)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ /* Prepare parameter block. */
+ parm = percpu_ptr(iucv_param, smp_processor_id());
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->ctrl.ippathid = path->pathid;
+ parm->ctrl.ipmsglim = path->msglim;
+ if (userdata)
+ memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
+ parm->ctrl.ipflags1 = path->flags;
+
+ rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
+ if (!rc) {
+ path->private = private;
+ path->msglim = parm->ctrl.ipmsglim;
+ path->flags = parm->ctrl.ipflags1;
+ }
+ local_bh_enable();
+ return rc;
+}
+
+/**
+ * iucv_path_connect
+ * @path: address of iucv path structure
+ * @handler: address of iucv handler structure
+ * @userid: 8-byte user identification
+ * @system: 8-byte target system identification
+ * @userdata: 16 bytes of data reflected to the communication partner
+ * @private: private data passed to interrupt handlers for this path
+ *
+ * This function establishes an IUCV path. Although the connect may complete
+ * successfully, you are not able to use the path until you receive an IUCV
+ * Connection Complete external interrupt.
+ *
+ * Returns the result of the CP IUCV call.
+ */
+int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
+ u8 userid[8], u8 system[8], u8 userdata[16],
+ void *private)
+{
+ union iucv_param *parm;
+ int rc;
+
+ preempt_disable();
+ if (iucv_tasklet_cpu != smp_processor_id())
+ spin_lock_bh(&iucv_table_lock);
+ parm = percpu_ptr(iucv_param, smp_processor_id());
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->ctrl.ipmsglim = path->msglim;
+ parm->ctrl.ipflags1 = path->flags;
+ if (userid) {
+ memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
+ ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
+ EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
+ }
+ if (system) {
+ memcpy(parm->ctrl.iptarget, system,
+ sizeof(parm->ctrl.iptarget));
+ ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
+ EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
+ }
+ if (userdata)
+ memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
+
+ rc = iucv_call_b2f0(IUCV_CONNECT, parm);
+ if (!rc) {
+ if (parm->ctrl.ippathid < iucv_max_pathid) {
+ path->pathid = parm->ctrl.ippathid;
+ path->msglim = parm->ctrl.ipmsglim;
+ path->flags = parm->ctrl.ipflags1;
+ path->handler = handler;
+ path->private = private;
+ list_add_tail(&path->list, &handler->paths);
+ iucv_path_table[path->pathid] = path;
+ } else {
+ iucv_sever_pathid(parm->ctrl.ippathid,
+ iucv_error_pathid);
+ rc = -EIO;
+ }
+ }
+ if (iucv_tasklet_cpu != smp_processor_id())
+ spin_unlock_bh(&iucv_table_lock);
+ preempt_enable();
+ return rc;
+}
+
+/**
+ * iucv_path_quiesce:
+ * @path: address of iucv path structure
+ * @userdata: 16 bytes of data reflected to the communication partner
+ *
+ * This function temporarily suspends incoming messages on an IUCV path.
+ * You can later reactivate the path by invoking the iucv_resume function.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ parm = percpu_ptr(iucv_param, smp_processor_id());
+ memset(parm, 0, sizeof(union iucv_param));
+ if (userdata)
+ memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
+ parm->ctrl.ippathid = path->pathid;
+ rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
+ local_bh_enable();
+ return rc;
+}
+
+/**
+ * iucv_path_resume:
+ * @path: address of iucv path structure
+ * @userdata: 16 bytes of data reflected to the communication partner
+ *
+ * This function resumes incoming messages on an IUCV path that has
+ * been stopped with iucv_path_quiesce.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ parm = percpu_ptr(iucv_param, smp_processor_id());
+ memset(parm, 0, sizeof(union iucv_param));
+ if (userdata)
+ memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
+ parm->ctrl.ippathid = path->pathid;
+ rc = iucv_call_b2f0(IUCV_RESUME, parm);
+ local_bh_enable();
+ return rc;
+}
+
+/**
+ * iucv_path_sever
+ * @path: address of iucv path structure
+ * @userdata: 16 bytes of data reflected to the communication partner
+ *
+ * This function terminates an IUCV path.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
+{
+ int rc;
+
+
+ preempt_disable();
+ if (iucv_tasklet_cpu != smp_processor_id())
+ spin_lock_bh(&iucv_table_lock);
+ rc = iucv_sever_pathid(path->pathid, userdata);
+ if (!rc) {
+ iucv_path_table[path->pathid] = NULL;
+ list_del_init(&path->list);
+ iucv_cleanup_pathid(path->pathid);
+ }
+ if (iucv_tasklet_cpu != smp_processor_id())
+ spin_unlock_bh(&iucv_table_lock);
+ preempt_enable();
+ return rc;
+}
+
+/**
+ * iucv_message_purge
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @srccls: source class of message
+ *
+ * Cancels a message you have sent.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
+ u32 srccls)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ parm = percpu_ptr(iucv_param, smp_processor_id());
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->purge.ippathid = path->pathid;
+ parm->purge.ipmsgid = msg->id;
+ parm->purge.ipsrccls = srccls;
+ parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
+ rc = iucv_call_b2f0(IUCV_PURGE, parm);
+ if (!rc) {
+ msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
+ msg->tag = parm->purge.ipmsgtag;
+ }
+ local_bh_enable();
+ return rc;
+}
+
+/**
+ * iucv_message_receive
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the message is received (IUCV_IPBUFLST)
+ * @buffer: address of data buffer or address of struct iucv_array
+ * @size: length of data buffer
+ * @residual:
+ *
+ * This function receives messages that are being sent to you over
+ * established paths. This function will deal with RMDATA messages
+ * embedded in struct iucv_message as well.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
+ u8 flags, void *buffer, size_t size, size_t *residual)
+{
+ union iucv_param *parm;
+ struct iucv_array *array;
+ u8 *rmmsg;
+ size_t copy;
+ int rc;
+
+ if (msg->flags & IUCV_IPRMDATA) {
+ /*
+ * Message is 8 bytes long and has been stored to the
+ * message descriptor itself.
+ */
+ rc = (size < 8) ? 5 : 0;
+ if (residual)
+ *residual = abs(size - 8);
+ rmmsg = msg->rmmsg;
+ if (flags & IUCV_IPBUFLST) {
+ /* Copy to struct iucv_array. */
+ size = (size < 8) ? size : 8;
+ for (array = buffer; size > 0; array++) {
+ copy = min_t(size_t, size, array->length);
+ memcpy((u8 *)(addr_t) array->address,
+ rmmsg, copy);
+ rmmsg += copy;
+ size -= copy;
+ }
+ } else {
+ /* Copy to direct buffer. */
+ memcpy(buffer, rmmsg, min_t(size_t, size, 8));
+ }
+ return 0;
+ }
+
+ local_bh_disable();
+ parm = percpu_ptr(iucv_param, smp_processor_id());
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->db.ipbfadr1 = (u32)(addr_t) buffer;
+ parm->db.ipbfln1f = (u32) size;
+ parm->db.ipmsgid = msg->id;
+ parm->db.ippathid = path->pathid;
+ parm->db.iptrgcls = msg->class;
+ parm->db.ipflags1 = (flags | IUCV_IPFGPID |
+ IUCV_IPFGMID | IUCV_IPTRGCLS);
+ rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
+ if (!rc || rc == 5) {
+ msg->flags = parm->db.ipflags1;
+ if (residual)
+ *residual = parm->db.ipbfln1f;
+ }
+ local_bh_enable();
+ return rc;
+}
+
+/**
+ * iucv_message_reject
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ *
+ * The reject function refuses a specified message. Between the time you
+ * are notified of a message and the time that you complete the message,
+ * the message may be rejected.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ parm = percpu_ptr(iucv_param, smp_processor_id());
+ memset(parm, 0, sizeof(union iucv_param));
+ parm->db.ippathid = path->pathid;
+ parm->db.ipmsgid = msg->id;
+ parm->db.iptrgcls = msg->class;
+ parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
+ rc = iucv_call_b2f0(IUCV_REJECT, parm);
+ local_bh_enable();
+ return rc;
+}
+
+/**
+ * iucv_message_reply
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
+ * @reply: address of reply data buffer or address of struct iucv_array
+ * @size: length of reply data buffer
+ *
+ * This function responds to the two-way messages that you receive. You
+ * must identify completely the message to which you wish to reply. ie,
+ * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
+ * the parameter list.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
+ u8 flags, void *reply, size_t size)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ parm = percpu_ptr(iucv_param, smp_processor_id());
+ memset(parm, 0, sizeof(union iucv_param));
+ if (flags & IUCV_IPRMDATA) {
+ parm->dpl.ippathid = path->pathid;
+ parm->dpl.ipflags1 = flags;
+ parm->dpl.ipmsgid = msg->id;
+ parm->dpl.iptrgcls = msg->class;
+ memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
+ } else {
+ parm->db.ipbfadr1 = (u32)(addr_t) reply;
+ parm->db.ipbfln1f = (u32) size;
+ parm->db.ippathid = path->pathid;
+ parm->db.ipflags1 = flags;
+ parm->db.ipmsgid = msg->id;
+ parm->db.iptrgcls = msg->class;
+ }
+ rc = iucv_call_b2f0(IUCV_REPLY, parm);
+ local_bh_enable();
+ return rc;
+}
+
+/**
+ * iucv_message_send
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
+ * @srccls: source class of message
+ * @buffer: address of send buffer or address of struct iucv_array
+ * @size: length of send buffer
+ *
+ * This function transmits data to another application. Data to be
+ * transmitted is in a buffer and this is a one-way message and the
+ * receiver will not reply to the message.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
+ u8 flags, u32 srccls, void *buffer, size_t size)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ parm = percpu_ptr(iucv_param, smp_processor_id());
+ memset(parm, 0, sizeof(union iucv_param));
+ if (flags & IUCV_IPRMDATA) {
+ /* Message of 8 bytes can be placed into the parameter list. */
+ parm->dpl.ippathid = path->pathid;
+ parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
+ parm->dpl.iptrgcls = msg->class;
+ parm->dpl.ipsrccls = srccls;
+ parm->dpl.ipmsgtag = msg->tag;
+ memcpy(parm->dpl.iprmmsg, buffer, 8);
+ } else {
+ parm->db.ipbfadr1 = (u32)(addr_t) buffer;
+ parm->db.ipbfln1f = (u32) size;
+ parm->db.ippathid = path->pathid;
+ parm->db.ipflags1 = flags | IUCV_IPNORPY;
+ parm->db.iptrgcls = msg->class;
+ parm->db.ipsrccls = srccls;
+ parm->db.ipmsgtag = msg->tag;
+ }
+ rc = iucv_call_b2f0(IUCV_SEND, parm);
+ if (!rc)
+ msg->id = parm->db.ipmsgid;
+ local_bh_enable();
+ return rc;
+}
+
+/**
+ * iucv_message_send2way
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the message is sent and the reply is received
+ * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
+ * @srccls: source class of message
+ * @buffer: address of send buffer or address of struct iucv_array
+ * @size: length of send buffer
+ * @ansbuf: address of answer buffer or address of struct iucv_array
+ * @asize: size of reply buffer
+ *
+ * This function transmits data to another application. Data to be
+ * transmitted is in a buffer. The receiver of the send is expected to
+ * reply to the message and a buffer is provided into which IUCV moves
+ * the reply to this message.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
+ u8 flags, u32 srccls, void *buffer, size_t size,
+ void *answer, size_t asize, size_t *residual)
+{
+ union iucv_param *parm;
+ int rc;
+
+ local_bh_disable();
+ parm = percpu_ptr(iucv_param, smp_processor_id());
+ memset(parm, 0, sizeof(union iucv_param));
+ if (flags & IUCV_IPRMDATA) {
+ parm->dpl.ippathid = path->pathid;
+ parm->dpl.ipflags1 = path->flags; /* priority message */
+ parm->dpl.iptrgcls = msg->class;
+ parm->dpl.ipsrccls = srccls;
+ parm->dpl.ipmsgtag = msg->tag;
+ parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
+ parm->dpl.ipbfln2f = (u32) asize;
+ memcpy(parm->dpl.iprmmsg, buffer, 8);
+ } else {
+ parm->db.ippathid = path->pathid;
+ parm->db.ipflags1 = path->flags; /* priority message */
+ parm->db.iptrgcls = msg->class;
+ parm->db.ipsrccls = srccls;
+ parm->db.ipmsgtag = msg->tag;
+ parm->db.ipbfadr1 = (u32)(addr_t) buffer;
+ parm->db.ipbfln1f = (u32) size;
+ parm->db.ipbfadr2 = (u32)(addr_t) answer;
+ parm->db.ipbfln2f = (u32) asize;
+ }
+ rc = iucv_call_b2f0(IUCV_SEND, parm);
+ if (!rc)
+ msg->id = parm->db.ipmsgid;
+ local_bh_enable();
+ return rc;
+}
+
+/**
+ * iucv_path_pending
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process connection pending work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_path_pending {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iptype;
+ u16 ipmsglim;
+ u16 res1;
+ u8 ipvmid[8];
+ u8 ipuser[16];
+ u32 res3;
+ u8 ippollfg;
+ u8 res4[3];
+} __attribute__ ((packed));
+
+static void iucv_path_pending(struct iucv_irq_data *data)
+{
+ struct iucv_path_pending *ipp = (void *) data;
+ struct iucv_handler *handler;
+ struct iucv_path *path;
+ char *error;
+
+ BUG_ON(iucv_path_table[ipp->ippathid]);
+ /* New pathid, handler found. Create a new path struct. */
+ error = iucv_error_no_memory;
+ path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
+ if (!path)
+ goto out_sever;
+ path->pathid = ipp->ippathid;
+ iucv_path_table[path->pathid] = path;
+ EBCASC(ipp->ipvmid, 8);
+
+ /* Call registered handler until one is found that wants the path. */
+ list_for_each_entry(handler, &iucv_handler_list, list) {
+ if (!handler->path_pending)
+ continue;
+ /*
+ * Add path to handler to allow a call to iucv_path_sever
+ * inside the path_pending function. If the handler returns
+ * an error remove the path from the handler again.
+ */
+ list_add(&path->list, &handler->paths);
+ path->handler = handler;
+ if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
+ return;
+ list_del(&path->list);
+ path->handler = NULL;
+ }
+ /* No handler wanted the path. */
+ iucv_path_table[path->pathid] = NULL;
+ iucv_path_free(path);
+ error = iucv_error_no_listener;
+out_sever:
+ iucv_sever_pathid(ipp->ippathid, error);
+}
+
+/**
+ * iucv_path_complete
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process connection complete work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_path_complete {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iptype;
+ u16 ipmsglim;
+ u16 res1;
+ u8 res2[8];
+ u8 ipuser[16];
+ u32 res3;
+ u8 ippollfg;
+ u8 res4[3];
+} __attribute__ ((packed));
+
+static void iucv_path_complete(struct iucv_irq_data *data)
+{
+ struct iucv_path_complete *ipc = (void *) data;
+ struct iucv_path *path = iucv_path_table[ipc->ippathid];
+
+ BUG_ON(!path || !path->handler);
+ if (path->handler->path_complete)
+ path->handler->path_complete(path, ipc->ipuser);
+}
+
+/**
+ * iucv_path_severed
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process connection severed work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_path_severed {
+ u16 ippathid;
+ u8 res1;
+ u8 iptype;
+ u32 res2;
+ u8 res3[8];
+ u8 ipuser[16];
+ u32 res4;
+ u8 ippollfg;
+ u8 res5[3];
+} __attribute__ ((packed));
+
+static void iucv_path_severed(struct iucv_irq_data *data)
+{
+ struct iucv_path_severed *ips = (void *) data;
+ struct iucv_path *path = iucv_path_table[ips->ippathid];
+
+ BUG_ON(!path || !path->handler);
+ if (path->handler->path_severed)
+ path->handler->path_severed(path, ips->ipuser);
+ else {
+ iucv_sever_pathid(path->pathid, NULL);
+ iucv_path_table[path->pathid] = NULL;
+ list_del_init(&path->list);
+ iucv_cleanup_pathid(path->pathid);
+ iucv_path_free(path);
+ }
+}
+
+/**
+ * iucv_path_quiesced
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process connection quiesced work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_path_quiesced {
+ u16 ippathid;
+ u8 res1;
+ u8 iptype;
+ u32 res2;
+ u8 res3[8];
+ u8 ipuser[16];
+ u32 res4;
+ u8 ippollfg;
+ u8 res5[3];
+} __attribute__ ((packed));
+
+static void iucv_path_quiesced(struct iucv_irq_data *data)
+{
+ struct iucv_path_quiesced *ipq = (void *) data;
+ struct iucv_path *path = iucv_path_table[ipq->ippathid];
+
+ BUG_ON(!path || !path->handler);
+ if (path->handler->path_quiesced)
+ path->handler->path_quiesced(path, ipq->ipuser);
+}
+
+/**
+ * iucv_path_resumed
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process connection resumed work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_path_resumed {
+ u16 ippathid;
+ u8 res1;
+ u8 iptype;
+ u32 res2;
+ u8 res3[8];
+ u8 ipuser[16];
+ u32 res4;
+ u8 ippollfg;
+ u8 res5[3];
+} __attribute__ ((packed));
+
+static void iucv_path_resumed(struct iucv_irq_data *data)
+{
+ struct iucv_path_resumed *ipr = (void *) data;
+ struct iucv_path *path = iucv_path_table[ipr->ippathid];
+
+ BUG_ON(!path || !path->handler);
+ if (path->handler->path_resumed)
+ path->handler->path_resumed(path, ipr->ipuser);
+}
+
+/**
+ * iucv_message_complete
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process message complete work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_message_complete {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iptype;
+ u32 ipmsgid;
+ u32 ipaudit;
+ u8 iprmmsg[8];
+ u32 ipsrccls;
+ u32 ipmsgtag;
+ u32 res;
+ u32 ipbfln2f;
+ u8 ippollfg;
+ u8 res2[3];
+} __attribute__ ((packed));
+
+static void iucv_message_complete(struct iucv_irq_data *data)
+{
+ struct iucv_message_complete *imc = (void *) data;
+ struct iucv_path *path = iucv_path_table[imc->ippathid];
+ struct iucv_message msg;
+
+ BUG_ON(!path || !path->handler);
+ if (path->handler->message_complete) {
+ msg.flags = imc->ipflags1;
+ msg.id = imc->ipmsgid;
+ msg.audit = imc->ipaudit;
+ memcpy(msg.rmmsg, imc->iprmmsg, 8);
+ msg.class = imc->ipsrccls;
+ msg.tag = imc->ipmsgtag;
+ msg.length = imc->ipbfln2f;
+ path->handler->message_complete(path, &msg);
+ }
+}
+
+/**
+ * iucv_message_pending
+ * @data: Pointer to external interrupt buffer
+ *
+ * Process message pending work item. Called from tasklet while holding
+ * iucv_table_lock.
+ */
+struct iucv_message_pending {
+ u16 ippathid;
+ u8 ipflags1;
+ u8 iptype;
+ u32 ipmsgid;
+ u32 iptrgcls;
+ union {
+ u32 iprmmsg1_u32;
+ u8 iprmmsg1[4];
+ } ln1msg1;
+ union {
+ u32 ipbfln1f;
+ u8 iprmmsg2[4];
+ } ln1msg2;
+ u32 res1[3];
+ u32 ipbfln2f;
+ u8 ippollfg;
+ u8 res2[3];
+} __attribute__ ((packed));
+
+static void iucv_message_pending(struct iucv_irq_data *data)
+{
+ struct iucv_message_pending *imp = (void *) data;
+ struct iucv_path *path = iucv_path_table[imp->ippathid];
+ struct iucv_message msg;
+
+ BUG_ON(!path || !path->handler);
+ if (path->handler->message_pending) {
+ msg.flags = imp->ipflags1;
+ msg.id = imp->ipmsgid;
+ msg.class = imp->iptrgcls;
+ if (imp->ipflags1 & IUCV_IPRMDATA) {
+ memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
+ msg.length = 8;
+ } else
+ msg.length = imp->ln1msg2.ipbfln1f;
+ msg.reply_size = imp->ipbfln2f;
+ path->handler->message_pending(path, &msg);
+ }
+}
+
+/**
+ * iucv_tasklet_handler:
+ *
+ * This tasklet loops over the queue of irq buffers created by
+ * iucv_external_interrupt, calls the appropriate action handler
+ * and then frees the buffer.
+ */
+static void iucv_tasklet_handler(unsigned long ignored)
+{
+ typedef void iucv_irq_fn(struct iucv_irq_data *);
+ static iucv_irq_fn *irq_fn[] = {
+ [0x01] = iucv_path_pending,
+ [0x02] = iucv_path_complete,
+ [0x03] = iucv_path_severed,
+ [0x04] = iucv_path_quiesced,
+ [0x05] = iucv_path_resumed,
+ [0x06] = iucv_message_complete,
+ [0x07] = iucv_message_complete,
+ [0x08] = iucv_message_pending,
+ [0x09] = iucv_message_pending,
+ };
+ struct iucv_work *p;
+
+ /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
+ spin_lock(&iucv_table_lock);
+ iucv_tasklet_cpu = smp_processor_id();
+
+ spin_lock_irq(&iucv_work_lock);
+ while (!list_empty(&iucv_work_queue)) {
+ p = list_entry(iucv_work_queue.next, struct iucv_work, list);
+ list_del_init(&p->list);
+ spin_unlock_irq(&iucv_work_lock);
+ irq_fn[p->data.iptype](&p->data);
+ kfree(p);
+ spin_lock_irq(&iucv_work_lock);
+ }
+ spin_unlock_irq(&iucv_work_lock);
+
+ iucv_tasklet_cpu = -1;
+ spin_unlock(&iucv_table_lock);
+}
+
+/**
+ * iucv_external_interrupt
+ * @code: irq code
+ *
+ * Handles external interrupts coming in from CP.
+ * Places the interrupt buffer on a queue and schedules iucv_tasklet_handler().
+ */
+static void iucv_external_interrupt(u16 code)
+{
+ struct iucv_irq_data *p;
+ struct iucv_work *work;
+
+ p = percpu_ptr(iucv_irq_data, smp_processor_id());
+ if (p->ippathid >= iucv_max_pathid) {
+ printk(KERN_WARNING "iucv_do_int: Got interrupt with "
+ "pathid %d > max_connections (%ld)\n",
+ p->ippathid, iucv_max_pathid - 1);
+ iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
+ return;
+ }
+ if (p->iptype < 0x01 || p->iptype > 0x09) {
+ printk(KERN_ERR "iucv_do_int: unknown iucv interrupt\n");
+ return;
+ }
+ work = kmalloc(sizeof(struct iucv_work), GFP_ATOMIC);
+ if (!work) {
+ printk(KERN_WARNING "iucv_external_interrupt: out of memory\n");
+ return;
+ }
+ memcpy(&work->data, p, sizeof(work->data));
+ spin_lock(&iucv_work_lock);
+ list_add_tail(&work->list, &iucv_work_queue);
+ spin_unlock(&iucv_work_lock);
+ tasklet_schedule(&iucv_tasklet);
+}
+
+/**
+ * iucv_init
+ *
+ * Allocates and initializes various data structures.
+ */
+static int iucv_init(void)
+{
+ int rc;
+
+ if (!MACHINE_IS_VM) {
+ rc = -EPROTONOSUPPORT;
+ goto out;
+ }
+ rc = iucv_query_maxconn();
+ if (rc)
+ goto out;
+ rc = register_external_interrupt (0x4000, iucv_external_interrupt);
+ if (rc)
+ goto out;
+ rc = bus_register(&iucv_bus);
+ if (rc)
+ goto out_int;
+ iucv_root = s390_root_dev_register("iucv");
+ if (IS_ERR(iucv_root)) {
+ rc = PTR_ERR(iucv_root);
+ goto out_bus;
+ }
+ /* Note: GFP_DMA used used to get memory below 2G */
+ iucv_irq_data = percpu_alloc(sizeof(struct iucv_irq_data),
+ GFP_KERNEL|GFP_DMA);
+ if (!iucv_irq_data) {
+ rc = -ENOMEM;
+ goto out_root;
+ }
+ /* Allocate parameter blocks. */
+ iucv_param = percpu_alloc(sizeof(union iucv_param),
+ GFP_KERNEL|GFP_DMA);
+ if (!iucv_param) {
+ rc = -ENOMEM;
+ goto out_extint;
+ }
+ register_hotcpu_notifier(&iucv_cpu_notifier);
+ ASCEBC(iucv_error_no_listener, 16);
+ ASCEBC(iucv_error_no_memory, 16);
+ ASCEBC(iucv_error_pathid, 16);
+ iucv_available = 1;
+ return 0;
+
+out_extint:
+ percpu_free(iucv_irq_data);
+out_root:
+ s390_root_dev_unregister(iucv_root);
+out_bus:
+ bus_unregister(&iucv_bus);
+out_int:
+ unregister_external_interrupt(0x4000, iucv_external_interrupt);
+out:
+ return rc;
+}
+
+/**
+ * iucv_exit
+ *
+ * Frees everything allocated from iucv_init.
+ */
+static void iucv_exit(void)
+{
+ struct iucv_work *p, *n;
+
+ spin_lock_irq(&iucv_work_lock);
+ list_for_each_entry_safe(p, n, &iucv_work_queue, list)
+ kfree(p);
+ spin_unlock_irq(&iucv_work_lock);
+ unregister_hotcpu_notifier(&iucv_cpu_notifier);
+ percpu_free(iucv_param);
+ percpu_free(iucv_irq_data);
+ s390_root_dev_unregister(iucv_root);
+ bus_unregister(&iucv_bus);
+ unregister_external_interrupt(0x4000, iucv_external_interrupt);
+}
+
+subsys_initcall(iucv_init);
+module_exit(iucv_exit);
+
+/**
+ * Export all public stuff
+ */
+EXPORT_SYMBOL (iucv_bus);
+EXPORT_SYMBOL (iucv_root);
+EXPORT_SYMBOL (iucv_register);
+EXPORT_SYMBOL (iucv_unregister);
+EXPORT_SYMBOL (iucv_path_accept);
+EXPORT_SYMBOL (iucv_path_connect);
+EXPORT_SYMBOL (iucv_path_quiesce);
+EXPORT_SYMBOL (iucv_path_sever);
+EXPORT_SYMBOL (iucv_message_purge);
+EXPORT_SYMBOL (iucv_message_receive);
+EXPORT_SYMBOL (iucv_message_reject);
+EXPORT_SYMBOL (iucv_message_reply);
+EXPORT_SYMBOL (iucv_message_send);
+EXPORT_SYMBOL (iucv_message_send2way);
+
+MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
+MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 17:02:31 +0000