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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 @@
1config IUCV
2 tristate "IUCV support (VM only)"
3 depends on S390
4 help
5 Select this option if you want to use inter-user communication under
6 VM or VIF sockets. If you run on z/VM, say "Y" to enable a fast
7 communication link between VM guests.
8
9config AFIUCV
10 tristate "AF_IUCV support (VM only)"
11 depends on IUCV
12 help
13 Select this option if you want to use inter-user communication under
14 VM or VIF sockets. If you run on z/VM, say "Y" to enable a fast
15 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 @@
1#
2# Makefile for IUCV
3#
4
5obj-$(CONFIG_IUCV) += iucv.o
6obj-$(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 @@
1/*
2 * linux/net/iucv/af_iucv.c
3 *
4 * IUCV protocol stack for Linux on zSeries
5 *
6 * Copyright 2006 IBM Corporation
7 *
8 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
9 */
10
11#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/list.h>
14#include <linux/errno.h>
15#include <linux/kernel.h>
16#include <linux/sched.h>
17#include <linux/slab.h>
18#include <linux/skbuff.h>
19#include <linux/init.h>
20#include <linux/poll.h>
21#include <net/sock.h>
22#include <asm/ebcdic.h>
23#include <asm/cpcmd.h>
24#include <linux/kmod.h>
25
26#include <net/iucv/iucv.h>
27#include <net/iucv/af_iucv.h>
28
29#define CONFIG_IUCV_SOCK_DEBUG 1
30
31#define IPRMDATA 0x80
32#define VERSION "1.0"
33
34static char iucv_userid[80];
35
36static struct proto_ops iucv_sock_ops;
37
38static struct proto iucv_proto = {
39 .name = "AF_IUCV",
40 .owner = THIS_MODULE,
41 .obj_size = sizeof(struct iucv_sock),
42};
43
44/* Call Back functions */
45static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
46static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
47static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
48static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], u8 ipuser[16]);
49static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
50
51static struct iucv_sock_list iucv_sk_list = {
52 .lock = RW_LOCK_UNLOCKED,
53 .autobind_name = ATOMIC_INIT(0)
54};
55
56static struct iucv_handler af_iucv_handler = {
57 .path_pending = iucv_callback_connreq,
58 .path_complete = iucv_callback_connack,
59 .path_severed = iucv_callback_connrej,
60 .message_pending = iucv_callback_rx,
61 .message_complete = iucv_callback_txdone
62};
63
64static inline void high_nmcpy(unsigned char *dst, char *src)
65{
66 memcpy(dst, src, 8);
67}
68
69static inline void low_nmcpy(unsigned char *dst, char *src)
70{
71 memcpy(&dst[8], src, 8);
72}
73
74/* Timers */
75static void iucv_sock_timeout(unsigned long arg)
76{
77 struct sock *sk = (struct sock *)arg;
78
79 bh_lock_sock(sk);
80 sk->sk_err = ETIMEDOUT;
81 sk->sk_state_change(sk);
82 bh_unlock_sock(sk);
83
84 iucv_sock_kill(sk);
85 sock_put(sk);
86}
87
88static void iucv_sock_clear_timer(struct sock *sk)
89{
90 sk_stop_timer(sk, &sk->sk_timer);
91}
92
93static void iucv_sock_init_timer(struct sock *sk)
94{
95 init_timer(&sk->sk_timer);
96 sk->sk_timer.function = iucv_sock_timeout;
97 sk->sk_timer.data = (unsigned long)sk;
98}
99
100static struct sock *__iucv_get_sock_by_name(char *nm)
101{
102 struct sock *sk;
103 struct hlist_node *node;
104
105 sk_for_each(sk, node, &iucv_sk_list.head)
106 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
107 return sk;
108
109 return NULL;
110}
111
112static void iucv_sock_destruct(struct sock *sk)
113{
114 skb_queue_purge(&sk->sk_receive_queue);
115 skb_queue_purge(&sk->sk_write_queue);
116}
117
118/* Cleanup Listen */
119static void iucv_sock_cleanup_listen(struct sock *parent)
120{
121 struct sock *sk;
122
123 /* Close non-accepted connections */
124 while ((sk = iucv_accept_dequeue(parent, NULL))) {
125 iucv_sock_close(sk);
126 iucv_sock_kill(sk);
127 }
128
129 parent->sk_state = IUCV_CLOSED;
130 sock_set_flag(parent, SOCK_ZAPPED);
131}
132
133/* Kill socket */
134static void iucv_sock_kill(struct sock *sk)
135{
136 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
137 return;
138
139 iucv_sock_unlink(&iucv_sk_list, sk);
140 sock_set_flag(sk, SOCK_DEAD);
141 sock_put(sk);
142}
143
144/* Close an IUCV socket */
145static void iucv_sock_close(struct sock *sk)
146{
147 unsigned char user_data[16];
148 struct iucv_sock *iucv = iucv_sk(sk);
149 int err;
150
151 iucv_sock_clear_timer(sk);
152 lock_sock(sk);
153
154 switch(sk->sk_state) {
155 case IUCV_LISTEN:
156 iucv_sock_cleanup_listen(sk);
157 break;
158
159 case IUCV_CONNECTED:
160 case IUCV_DISCONN:
161 err = 0;
162 if (iucv->path) {
163 low_nmcpy(user_data, iucv->src_name);
164 high_nmcpy(user_data, iucv->dst_name);
165 ASCEBC(user_data, sizeof(user_data));
166 err = iucv_path_sever(iucv->path, user_data);
167 iucv_path_free(iucv->path);
168 iucv->path = NULL;
169 }
170
171 sk->sk_state = IUCV_CLOSED;
172 sk->sk_state_change(sk);
173 sk->sk_err = ECONNRESET;
174 sk->sk_state_change(sk);
175
176 skb_queue_purge(&iucv->send_skb_q);
177
178 sock_set_flag(sk, SOCK_ZAPPED);
179 break;
180
181 default:
182 sock_set_flag(sk, SOCK_ZAPPED);
183 break;
184 };
185
186 release_sock(sk);
187 iucv_sock_kill(sk);
188}
189
190static void iucv_sock_init(struct sock *sk, struct sock *parent)
191{
192 if (parent)
193 sk->sk_type = parent->sk_type;
194}
195
196static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
197{
198 struct sock *sk;
199
200 sk = sk_alloc(PF_IUCV, prio, &iucv_proto, 1);
201 if (!sk)
202 return NULL;
203
204 sock_init_data(sock, sk);
205 INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
206 skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
207 iucv_sk(sk)->send_tag = 0;
208
209 sk->sk_destruct = iucv_sock_destruct;
210 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
211 sk->sk_allocation = GFP_DMA;
212
213 sock_reset_flag(sk, SOCK_ZAPPED);
214
215 sk->sk_protocol = proto;
216 sk->sk_state = IUCV_OPEN;
217
218 iucv_sock_init_timer(sk);
219
220 iucv_sock_link(&iucv_sk_list, sk);
221 return sk;
222}
223
224/* Create an IUCV socket */
225static int iucv_sock_create(struct socket *sock, int protocol)
226{
227 struct sock *sk;
228
229 if (sock->type != SOCK_STREAM)
230 return -ESOCKTNOSUPPORT;
231
232 sock->state = SS_UNCONNECTED;
233 sock->ops = &iucv_sock_ops;
234
235 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
236 if (!sk)
237 return -ENOMEM;
238
239 iucv_sock_init(sk, NULL);
240
241 return 0;
242}
243
244void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
245{
246 write_lock_bh(&l->lock);
247 sk_add_node(sk, &l->head);
248 write_unlock_bh(&l->lock);
249}
250
251void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
252{
253 write_lock_bh(&l->lock);
254 sk_del_node_init(sk);
255 write_unlock_bh(&l->lock);
256}
257
258void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
259{
260 sock_hold(sk);
261 list_add_tail(&iucv_sk(sk)->accept_q, &iucv_sk(parent)->accept_q);
262 iucv_sk(sk)->parent = parent;
263 parent->sk_ack_backlog++;
264}
265
266void iucv_accept_unlink(struct sock *sk)
267{
268 list_del_init(&iucv_sk(sk)->accept_q);
269 iucv_sk(sk)->parent->sk_ack_backlog--;
270 iucv_sk(sk)->parent = NULL;
271 sock_put(sk);
272}
273
274struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
275{
276 struct iucv_sock *isk, *n;
277 struct sock *sk;
278
279 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q){
280 sk = (struct sock *) isk;
281 lock_sock(sk);
282
283 if (sk->sk_state == IUCV_CLOSED) {
284 release_sock(sk);
285 iucv_accept_unlink(sk);
286 continue;
287 }
288
289 if (sk->sk_state == IUCV_CONNECTED ||
290 sk->sk_state == IUCV_SEVERED ||
291 !newsock) {
292 iucv_accept_unlink(sk);
293 if (newsock)
294 sock_graft(sk, newsock);
295
296 if (sk->sk_state == IUCV_SEVERED)
297 sk->sk_state = IUCV_DISCONN;
298
299 release_sock(sk);
300 return sk;
301 }
302
303 release_sock(sk);
304 }
305 return NULL;
306}
307
308int iucv_sock_wait_state(struct sock *sk, int state, int state2,
309 unsigned long timeo)
310{
311 DECLARE_WAITQUEUE(wait, current);
312 int err = 0;
313
314 add_wait_queue(sk->sk_sleep, &wait);
315 while (sk->sk_state != state && sk->sk_state != state2) {
316 set_current_state(TASK_INTERRUPTIBLE);
317
318 if (!timeo) {
319 err = -EAGAIN;
320 break;
321 }
322
323 if (signal_pending(current)) {
324 err = sock_intr_errno(timeo);
325 break;
326 }
327
328 release_sock(sk);
329 timeo = schedule_timeout(timeo);
330 lock_sock(sk);
331
332 err = sock_error(sk);
333 if (err)
334 break;
335 }
336 set_current_state(TASK_RUNNING);
337 remove_wait_queue(sk->sk_sleep, &wait);
338 return err;
339}
340
341/* Bind an unbound socket */
342static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
343 int addr_len)
344{
345 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
346 struct sock *sk = sock->sk;
347 struct iucv_sock *iucv;
348 int err;
349
350 /* Verify the input sockaddr */
351 if (!addr || addr->sa_family != AF_IUCV)
352 return -EINVAL;
353
354 lock_sock(sk);
355 if (sk->sk_state != IUCV_OPEN) {
356 err = -EBADFD;
357 goto done;
358 }
359
360 write_lock_bh(&iucv_sk_list.lock);
361
362 iucv = iucv_sk(sk);
363 if (__iucv_get_sock_by_name(sa->siucv_name)) {
364 err = -EADDRINUSE;
365 goto done_unlock;
366 }
367 if (iucv->path) {
368 err = 0;
369 goto done_unlock;
370 }
371
372 /* Bind the socket */
373 memcpy(iucv->src_name, sa->siucv_name, 8);
374
375 /* Copy the user id */
376 memcpy(iucv->src_user_id, iucv_userid, 8);
377 sk->sk_state = IUCV_BOUND;
378 err = 0;
379
380done_unlock:
381 /* Release the socket list lock */
382 write_unlock_bh(&iucv_sk_list.lock);
383done:
384 release_sock(sk);
385 return err;
386}
387
388/* Automatically bind an unbound socket */
389static int iucv_sock_autobind(struct sock *sk)
390{
391 struct iucv_sock *iucv = iucv_sk(sk);
392 char query_buffer[80];
393 char name[12];
394 int err = 0;
395
396 /* Set the userid and name */
397 cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
398 if (unlikely(err))
399 return -EPROTO;
400
401 memcpy(iucv->src_user_id, query_buffer, 8);
402
403 write_lock_bh(&iucv_sk_list.lock);
404
405 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
406 while (__iucv_get_sock_by_name(name)) {
407 sprintf(name, "%08x",
408 atomic_inc_return(&iucv_sk_list.autobind_name));
409 }
410
411 write_unlock_bh(&iucv_sk_list.lock);
412
413 memcpy(&iucv->src_name, name, 8);
414
415 return err;
416}
417
418/* Connect an unconnected socket */
419static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
420 int alen, int flags)
421{
422 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
423 struct sock *sk = sock->sk;
424 struct iucv_sock *iucv;
425 unsigned char user_data[16];
426 int err;
427
428 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
429 return -EINVAL;
430
431 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
432 return -EBADFD;
433
434 if (sk->sk_type != SOCK_STREAM)
435 return -EINVAL;
436
437 iucv = iucv_sk(sk);
438
439 if (sk->sk_state == IUCV_OPEN) {
440 err = iucv_sock_autobind(sk);
441 if (unlikely(err))
442 return err;
443 }
444
445 lock_sock(sk);
446
447 /* Set the destination information */
448 memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8);
449 memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8);
450
451 high_nmcpy(user_data, sa->siucv_name);
452 low_nmcpy(user_data, iucv_sk(sk)->src_name);
453 ASCEBC(user_data, sizeof(user_data));
454
455 iucv = iucv_sk(sk);
456 /* Create path. */
457 iucv->path = iucv_path_alloc(IUCV_QUEUELEN_DEFAULT,
458 IPRMDATA, GFP_KERNEL);
459 err = iucv_path_connect(iucv->path, &af_iucv_handler,
460 sa->siucv_user_id, NULL, user_data, sk);
461 if (err) {
462 iucv_path_free(iucv->path);
463 iucv->path = NULL;
464 err = -ECONNREFUSED;
465 goto done;
466 }
467
468 if (sk->sk_state != IUCV_CONNECTED) {
469 err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN,
470 sock_sndtimeo(sk, flags & O_NONBLOCK));
471 }
472
473 if (sk->sk_state == IUCV_DISCONN) {
474 release_sock(sk);
475 return -ECONNREFUSED;
476 }
477done:
478 release_sock(sk);
479 return err;
480}
481
482/* Move a socket into listening state. */
483static int iucv_sock_listen(struct socket *sock, int backlog)
484{
485 struct sock *sk = sock->sk;
486 int err;
487
488 lock_sock(sk);
489
490 err = -EINVAL;
491 if (sk->sk_state != IUCV_BOUND || sock->type != SOCK_STREAM)
492 goto done;
493
494 sk->sk_max_ack_backlog = backlog;
495 sk->sk_ack_backlog = 0;
496 sk->sk_state = IUCV_LISTEN;
497 err = 0;
498
499done:
500 release_sock(sk);
501 return err;
502}
503
504/* Accept a pending connection */
505static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
506 int flags)
507{
508 DECLARE_WAITQUEUE(wait, current);
509 struct sock *sk = sock->sk, *nsk;
510 long timeo;
511 int err = 0;
512
513 lock_sock(sk);
514
515 if (sk->sk_state != IUCV_LISTEN) {
516 err = -EBADFD;
517 goto done;
518 }
519
520 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
521
522 /* Wait for an incoming connection */
523 add_wait_queue_exclusive(sk->sk_sleep, &wait);
524 while (!(nsk = iucv_accept_dequeue(sk, newsock))){
525 set_current_state(TASK_INTERRUPTIBLE);
526 if (!timeo) {
527 err = -EAGAIN;
528 break;
529 }
530
531 release_sock(sk);
532 timeo = schedule_timeout(timeo);
533 lock_sock(sk);
534
535 if (sk->sk_state != IUCV_LISTEN) {
536 err = -EBADFD;
537 break;
538 }
539
540 if (signal_pending(current)) {
541 err = sock_intr_errno(timeo);
542 break;
543 }
544 }
545
546 set_current_state(TASK_RUNNING);
547 remove_wait_queue(sk->sk_sleep, &wait);
548
549 if (err)
550 goto done;
551
552 newsock->state = SS_CONNECTED;
553
554done:
555 release_sock(sk);
556 return err;
557}
558
559static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
560 int *len, int peer)
561{
562 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
563 struct sock *sk = sock->sk;
564
565 addr->sa_family = AF_IUCV;
566 *len = sizeof(struct sockaddr_iucv);
567
568 if (peer) {
569 memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
570 memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
571 } else {
572 memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
573 memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
574 }
575 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
576 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
577 memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
578
579 return 0;
580}
581
582static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
583 struct msghdr *msg, size_t len)
584{
585 struct sock *sk = sock->sk;
586 struct iucv_sock *iucv = iucv_sk(sk);
587 struct sk_buff *skb;
588 struct iucv_message txmsg;
589 int err;
590
591 err = sock_error(sk);
592 if (err)
593 return err;
594
595 if (msg->msg_flags & MSG_OOB)
596 return -EOPNOTSUPP;
597
598 lock_sock(sk);
599
600 if (sk->sk_shutdown & SEND_SHUTDOWN) {
601 err = -EPIPE;
602 goto out;
603 }
604
605 if (sk->sk_state == IUCV_CONNECTED){
606 if(!(skb = sock_alloc_send_skb(sk, len,
607 msg->msg_flags & MSG_DONTWAIT,
608 &err)))
609 return err;
610
611 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)){
612 err = -EFAULT;
613 goto fail;
614 }
615
616 txmsg.class = 0;
617 txmsg.tag = iucv->send_tag++;
618 memcpy(skb->cb, &txmsg.tag, 4);
619 skb_queue_tail(&iucv->send_skb_q, skb);
620 err = iucv_message_send(iucv->path, &txmsg, 0, 0,
621 (void *) skb->data, skb->len);
622 if (err) {
623 if (err == 3)
624 printk(KERN_ERR "AF_IUCV msg limit exceeded\n");
625 skb_unlink(skb, &iucv->send_skb_q);
626 err = -EPIPE;
627 goto fail;
628 }
629
630 } else {
631 err = -ENOTCONN;
632 goto out;
633 }
634
635 release_sock(sk);
636 return len;
637
638fail:
639 kfree_skb(skb);
640out:
641 release_sock(sk);
642 return err;
643}
644
645static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
646 struct msghdr *msg, size_t len, int flags)
647{
648 int noblock = flags & MSG_DONTWAIT;
649 struct sock *sk = sock->sk;
650 int target, copied = 0;
651 struct sk_buff *skb;
652 int err = 0;
653
654 if (flags & (MSG_OOB))
655 return -EOPNOTSUPP;
656
657 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
658
659 skb = skb_recv_datagram(sk, flags, noblock, &err);
660 if (!skb) {
661 if (sk->sk_shutdown & RCV_SHUTDOWN)
662 return 0;
663 return err;
664 }
665
666 copied = min_t(unsigned int, skb->len, len);
667
668 if (memcpy_toiovec(msg->msg_iov, skb->data, copied)) {
669 skb_queue_head(&sk->sk_receive_queue, skb);
670 if (copied == 0)
671 return -EFAULT;
672 }
673
674 len -= copied;
675
676 /* Mark read part of skb as used */
677 if (!(flags & MSG_PEEK)) {
678 skb_pull(skb, copied);
679
680 if (skb->len) {
681 skb_queue_head(&sk->sk_receive_queue, skb);
682 goto done;
683 }
684
685 kfree_skb(skb);
686 } else
687 skb_queue_head(&sk->sk_receive_queue, skb);
688
689done:
690 return err ? : copied;
691}
692
693static inline unsigned int iucv_accept_poll(struct sock *parent)
694{
695 struct iucv_sock *isk, *n;
696 struct sock *sk;
697
698 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q){
699 sk = (struct sock *) isk;
700
701 if (sk->sk_state == IUCV_CONNECTED)
702 return POLLIN | POLLRDNORM;
703 }
704
705 return 0;
706}
707
708unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
709 poll_table *wait)
710{
711 struct sock *sk = sock->sk;
712 unsigned int mask = 0;
713
714 poll_wait(file, sk->sk_sleep, wait);
715
716 if (sk->sk_state == IUCV_LISTEN)
717 return iucv_accept_poll(sk);
718
719 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
720 mask |= POLLERR;
721
722 if (sk->sk_shutdown & RCV_SHUTDOWN)
723 mask |= POLLRDHUP;
724
725 if (sk->sk_shutdown == SHUTDOWN_MASK)
726 mask |= POLLHUP;
727
728 if (!skb_queue_empty(&sk->sk_receive_queue) ||
729 (sk->sk_shutdown & RCV_SHUTDOWN))
730 mask |= POLLIN | POLLRDNORM;
731
732 if (sk->sk_state == IUCV_CLOSED)
733 mask |= POLLHUP;
734
735 if (sock_writeable(sk))
736 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
737 else
738 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
739
740 return mask;
741}
742
743static int iucv_sock_shutdown(struct socket *sock, int how)
744{
745 struct sock *sk = sock->sk;
746 struct iucv_sock *iucv = iucv_sk(sk);
747 struct iucv_message txmsg;
748 int err = 0;
749 u8 prmmsg[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
750
751 how++;
752
753 if ((how & ~SHUTDOWN_MASK) || !how)
754 return -EINVAL;
755
756 lock_sock(sk);
757 switch(sk->sk_state) {
758 case IUCV_CLOSED:
759 err = -ENOTCONN;
760 goto fail;
761
762 default:
763 sk->sk_shutdown |= how;
764 break;
765 }
766
767 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
768 txmsg.class = 0;
769 txmsg.tag = 0;
770 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
771 (void *) prmmsg, 8);
772 if (err) {
773 switch(err) {
774 case 1:
775 err = -ENOTCONN;
776 break;
777 case 2:
778 err = -ECONNRESET;
779 break;
780 default:
781 err = -ENOTCONN;
782 break;
783 }
784 }
785 }
786
787 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
788 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
789 if (err)
790 err = -ENOTCONN;
791
792 skb_queue_purge(&sk->sk_receive_queue);
793 }
794
795 /* Wake up anyone sleeping in poll */
796 sk->sk_state_change(sk);
797
798fail:
799 release_sock(sk);
800 return err;
801}
802
803static int iucv_sock_release(struct socket *sock)
804{
805 struct sock *sk = sock->sk;
806 int err = 0;
807
808 if (!sk)
809 return 0;
810
811 iucv_sock_close(sk);
812
813 /* Unregister with IUCV base support */
814 if (iucv_sk(sk)->path) {
815 iucv_path_sever(iucv_sk(sk)->path, NULL);
816 iucv_path_free(iucv_sk(sk)->path);
817 iucv_sk(sk)->path = NULL;
818 }
819
820 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime){
821 lock_sock(sk);
822 err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0,
823 sk->sk_lingertime);
824 release_sock(sk);
825 }
826
827 sock_orphan(sk);
828 iucv_sock_kill(sk);
829 return err;
830}
831
832/* Callback wrappers - called from iucv base support */
833static int iucv_callback_connreq(struct iucv_path *path,
834 u8 ipvmid[8], u8 ipuser[16])
835{
836 unsigned char user_data[16];
837 unsigned char nuser_data[16];
838 unsigned char src_name[8];
839 struct hlist_node *node;
840 struct sock *sk, *nsk;
841 struct iucv_sock *iucv, *niucv;
842 int err;
843
844 memcpy(src_name, ipuser, 8);
845 EBCASC(src_name, 8);
846 /* Find out if this path belongs to af_iucv. */
847 read_lock(&iucv_sk_list.lock);
848 iucv = NULL;
849 sk_for_each(sk, node, &iucv_sk_list.head)
850 if (sk->sk_state == IUCV_LISTEN &&
851 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
852 /*
853 * Found a listening socket with
854 * src_name == ipuser[0-7].
855 */
856 iucv = iucv_sk(sk);
857 break;
858 }
859 read_unlock(&iucv_sk_list.lock);
860 if (!iucv)
861 /* No socket found, not one of our paths. */
862 return -EINVAL;
863
864 bh_lock_sock(sk);
865
866 /* Check if parent socket is listening */
867 low_nmcpy(user_data, iucv->src_name);
868 high_nmcpy(user_data, iucv->dst_name);
869 ASCEBC(user_data, sizeof(user_data));
870 if (sk->sk_state != IUCV_LISTEN) {
871 err = iucv_path_sever(path, user_data);
872 goto fail;
873 }
874
875 /* Check for backlog size */
876 if (sk_acceptq_is_full(sk)) {
877 err = iucv_path_sever(path, user_data);
878 goto fail;
879 }
880
881 /* Create the new socket */
882 nsk = iucv_sock_alloc(NULL, SOCK_STREAM, GFP_ATOMIC);
883 if (!nsk){
884 err = iucv_path_sever(path, user_data);
885 goto fail;
886 }
887
888 niucv = iucv_sk(nsk);
889 iucv_sock_init(nsk, sk);
890
891 /* Set the new iucv_sock */
892 memcpy(niucv->dst_name, ipuser + 8, 8);
893 EBCASC(niucv->dst_name, 8);
894 memcpy(niucv->dst_user_id, ipvmid, 8);
895 memcpy(niucv->src_name, iucv->src_name, 8);
896 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
897 niucv->path = path;
898
899 /* Call iucv_accept */
900 high_nmcpy(nuser_data, ipuser + 8);
901 memcpy(nuser_data + 8, niucv->src_name, 8);
902 ASCEBC(nuser_data + 8, 8);
903
904 path->msglim = IUCV_QUEUELEN_DEFAULT;
905 err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
906 if (err){
907 err = iucv_path_sever(path, user_data);
908 goto fail;
909 }
910
911 iucv_accept_enqueue(sk, nsk);
912
913 /* Wake up accept */
914 nsk->sk_state = IUCV_CONNECTED;
915 sk->sk_data_ready(sk, 1);
916 err = 0;
917fail:
918 bh_unlock_sock(sk);
919 return 0;
920}
921
922static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
923{
924 struct sock *sk = path->private;
925
926 sk->sk_state = IUCV_CONNECTED;
927 sk->sk_state_change(sk);
928}
929
930static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
931{
932 struct sock *sk = path->private;
933 struct sk_buff *skb;
934 int rc;
935
936 if (sk->sk_shutdown & RCV_SHUTDOWN)
937 return;
938
939 skb = alloc_skb(msg->length, GFP_ATOMIC | GFP_DMA);
940 if (!skb) {
941 iucv_message_reject(path, msg);
942 return;
943 }
944
945 if (msg->flags & IPRMDATA) {
946 skb->data = NULL;
947 skb->len = 0;
948 } else {
949 rc = iucv_message_receive(path, msg, 0, skb->data,
950 msg->length, NULL);
951 if (rc) {
952 kfree_skb(skb);
953 return;
954 }
955
956 skb->h.raw = skb->data;
957 skb->nh.raw = skb->data;
958 skb->len = msg->length;
959 }
960
961 if (sock_queue_rcv_skb(sk, skb))
962 kfree_skb(skb);
963}
964
965static void iucv_callback_txdone(struct iucv_path *path,
966 struct iucv_message *msg)
967{
968 struct sock *sk = path->private;
969 struct sk_buff *this;
970 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
971 struct sk_buff *list_skb = list->next;
972 unsigned long flags;
973
974 spin_lock_irqsave(&list->lock, flags);
975
976 do {
977 this = list_skb;
978 list_skb = list_skb->next;
979 } while (memcmp(&msg->tag, this->cb, 4));
980
981 spin_unlock_irqrestore(&list->lock, flags);
982
983 skb_unlink(this, &iucv_sk(sk)->send_skb_q);
984 kfree_skb(this);
985}
986
987static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
988{
989 struct sock *sk = path->private;
990
991 if (!list_empty(&iucv_sk(sk)->accept_q))
992 sk->sk_state = IUCV_SEVERED;
993 else
994 sk->sk_state = IUCV_DISCONN;
995
996 sk->sk_state_change(sk);
997}
998
999static struct proto_ops iucv_sock_ops = {
1000 .family = PF_IUCV,
1001 .owner = THIS_MODULE,
1002 .release = iucv_sock_release,
1003 .bind = iucv_sock_bind,
1004 .connect = iucv_sock_connect,
1005 .listen = iucv_sock_listen,
1006 .accept = iucv_sock_accept,
1007 .getname = iucv_sock_getname,
1008 .sendmsg = iucv_sock_sendmsg,
1009 .recvmsg = iucv_sock_recvmsg,
1010 .poll = iucv_sock_poll,
1011 .ioctl = sock_no_ioctl,
1012 .mmap = sock_no_mmap,
1013 .socketpair = sock_no_socketpair,
1014 .shutdown = iucv_sock_shutdown,
1015 .setsockopt = sock_no_setsockopt,
1016 .getsockopt = sock_no_getsockopt
1017};
1018
1019static struct net_proto_family iucv_sock_family_ops = {
1020 .family = AF_IUCV,
1021 .owner = THIS_MODULE,
1022 .create = iucv_sock_create,
1023};
1024
1025static int afiucv_init(void)
1026{
1027 int err;
1028
1029 if (!MACHINE_IS_VM) {
1030 printk(KERN_ERR "AF_IUCV connection needs VM as base\n");
1031 err = -EPROTONOSUPPORT;
1032 goto out;
1033 }
1034 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
1035 if (unlikely(err)) {
1036 printk(KERN_ERR "AF_IUCV needs the VM userid\n");
1037 err = -EPROTONOSUPPORT;
1038 goto out;
1039 }
1040
1041 err = iucv_register(&af_iucv_handler, 0);
1042 if (err)
1043 goto out;
1044 err = proto_register(&iucv_proto, 0);
1045 if (err)
1046 goto out_iucv;
1047 err = sock_register(&iucv_sock_family_ops);
1048 if (err)
1049 goto out_proto;
1050 printk(KERN_INFO "AF_IUCV lowlevel driver initialized\n");
1051 return 0;
1052
1053out_proto:
1054 proto_unregister(&iucv_proto);
1055out_iucv:
1056 iucv_unregister(&af_iucv_handler, 0);
1057out:
1058 return err;
1059}
1060
1061static void __exit afiucv_exit(void)
1062{
1063 sock_unregister(PF_IUCV);
1064 proto_unregister(&iucv_proto);
1065 iucv_unregister(&af_iucv_handler, 0);
1066
1067 printk(KERN_INFO "AF_IUCV lowlevel driver unloaded\n");
1068}
1069
1070module_init(afiucv_init);
1071module_exit(afiucv_exit);
1072
1073MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
1074MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
1075MODULE_VERSION(VERSION);
1076MODULE_LICENSE("GPL");
1077MODULE_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 @@
1/*
2 * IUCV base infrastructure.
3 *
4 * Copyright 2001, 2006 IBM Deutschland Entwicklung GmbH, IBM Corporation
5 * Author(s):
6 * Original source:
7 * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
8 * Xenia Tkatschow (xenia@us.ibm.com)
9 * 2Gb awareness and general cleanup:
10 * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
11 * Rewritten for af_iucv:
12 * Martin Schwidefsky <schwidefsky@de.ibm.com>
13 *
14 * Documentation used:
15 * The original source
16 * CP Programming Service, IBM document # SC24-5760
17 *
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation; either version 2, or (at your option)
21 * any later version.
22 *
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
27 *
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
31 */
32
33#include <linux/module.h>
34#include <linux/moduleparam.h>
35
36#include <linux/spinlock.h>
37#include <linux/kernel.h>
38#include <linux/slab.h>
39#include <linux/init.h>
40#include <linux/interrupt.h>
41#include <linux/list.h>
42#include <linux/errno.h>
43#include <linux/err.h>
44#include <linux/device.h>
45#include <linux/cpu.h>
46#include <net/iucv/iucv.h>
47#include <asm/atomic.h>
48#include <asm/ebcdic.h>
49#include <asm/io.h>
50#include <asm/s390_ext.h>
51#include <asm/s390_rdev.h>
52#include <asm/smp.h>
53
54/*
55 * FLAGS:
56 * All flags are defined in the field IPFLAGS1 of each function
57 * and can be found in CP Programming Services.
58 * IPSRCCLS - Indicates you have specified a source class.
59 * IPTRGCLS - Indicates you have specified a target class.
60 * IPFGPID - Indicates you have specified a pathid.
61 * IPFGMID - Indicates you have specified a message ID.
62 * IPNORPY - Indicates a one-way message. No reply expected.
63 * IPALL - Indicates that all paths are affected.
64 */
65#define IUCV_IPSRCCLS 0x01
66#define IUCV_IPTRGCLS 0x01
67#define IUCV_IPFGPID 0x02
68#define IUCV_IPFGMID 0x04
69#define IUCV_IPNORPY 0x10
70#define IUCV_IPALL 0x80
71
72static int iucv_bus_match (struct device *dev, struct device_driver *drv)
73{
74 return 0;
75}
76
77struct bus_type iucv_bus = {
78 .name = "iucv",
79 .match = iucv_bus_match,
80};
81
82struct device *iucv_root;
83static int iucv_available;
84
85/* General IUCV interrupt structure */
86struct iucv_irq_data {
87 u16 ippathid;
88 u8 ipflags1;
89 u8 iptype;
90 u32 res2[8];
91};
92
93struct iucv_work {
94 struct list_head list;
95 struct iucv_irq_data data;
96};
97
98static LIST_HEAD(iucv_work_queue);
99static DEFINE_SPINLOCK(iucv_work_lock);
100
101static struct iucv_irq_data *iucv_irq_data;
102static cpumask_t iucv_buffer_cpumask = CPU_MASK_NONE;
103static cpumask_t iucv_irq_cpumask = CPU_MASK_NONE;
104
105static void iucv_tasklet_handler(unsigned long);
106static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_handler,0);
107
108enum iucv_command_codes {
109 IUCV_QUERY = 0,
110 IUCV_RETRIEVE_BUFFER = 2,
111 IUCV_SEND = 4,
112 IUCV_RECEIVE = 5,
113 IUCV_REPLY = 6,
114 IUCV_REJECT = 8,
115 IUCV_PURGE = 9,
116 IUCV_ACCEPT = 10,
117 IUCV_CONNECT = 11,
118 IUCV_DECLARE_BUFFER = 12,
119 IUCV_QUIESCE = 13,
120 IUCV_RESUME = 14,
121 IUCV_SEVER = 15,
122 IUCV_SETMASK = 16,
123};
124
125/*
126 * Error messages that are used with the iucv_sever function. They get
127 * converted to EBCDIC.
128 */
129static char iucv_error_no_listener[16] = "NO LISTENER";
130static char iucv_error_no_memory[16] = "NO MEMORY";
131static char iucv_error_pathid[16] = "INVALID PATHID";
132
133/*
134 * iucv_handler_list: List of registered handlers.
135 */
136static LIST_HEAD(iucv_handler_list);
137
138/*
139 * iucv_path_table: an array of iucv_path structures.
140 */
141static struct iucv_path **iucv_path_table;
142static unsigned long iucv_max_pathid;
143
144/*
145 * iucv_lock: spinlock protecting iucv_handler_list and iucv_pathid_table
146 */
147static DEFINE_SPINLOCK(iucv_table_lock);
148
149/*
150 * iucv_tasklet_cpu: contains the number of the cpu executing the tasklet.
151 * Needed for iucv_path_sever called from tasklet.
152 */
153static int iucv_tasklet_cpu = -1;
154
155/*
156 * Mutex and wait queue for iucv_register/iucv_unregister.
157 */
158static DEFINE_MUTEX(iucv_register_mutex);
159
160/*
161 * Counter for number of non-smp capable handlers.
162 */
163static int iucv_nonsmp_handler;
164
165/*
166 * IUCV control data structure. Used by iucv_path_accept, iucv_path_connect,
167 * iucv_path_quiesce and iucv_path_sever.
168 */
169struct iucv_cmd_control {
170 u16 ippathid;
171 u8 ipflags1;
172 u8 iprcode;
173 u16 ipmsglim;
174 u16 res1;
175 u8 ipvmid[8];
176 u8 ipuser[16];
177 u8 iptarget[8];
178} __attribute__ ((packed,aligned(8)));
179
180/*
181 * Data in parameter list iucv structure. Used by iucv_message_send,
182 * iucv_message_send2way and iucv_message_reply.
183 */
184struct iucv_cmd_dpl {
185 u16 ippathid;
186 u8 ipflags1;
187 u8 iprcode;
188 u32 ipmsgid;
189 u32 iptrgcls;
190 u8 iprmmsg[8];
191 u32 ipsrccls;
192 u32 ipmsgtag;
193 u32 ipbfadr2;
194 u32 ipbfln2f;
195 u32 res;
196} __attribute__ ((packed,aligned(8)));
197
198/*
199 * Data in buffer iucv structure. Used by iucv_message_receive,
200 * iucv_message_reject, iucv_message_send, iucv_message_send2way
201 * and iucv_declare_cpu.
202 */
203struct iucv_cmd_db {
204 u16 ippathid;
205 u8 ipflags1;
206 u8 iprcode;
207 u32 ipmsgid;
208 u32 iptrgcls;
209 u32 ipbfadr1;
210 u32 ipbfln1f;
211 u32 ipsrccls;
212 u32 ipmsgtag;
213 u32 ipbfadr2;
214 u32 ipbfln2f;
215 u32 res;
216} __attribute__ ((packed,aligned(8)));
217
218/*
219 * Purge message iucv structure. Used by iucv_message_purge.
220 */
221struct iucv_cmd_purge {
222 u16 ippathid;
223 u8 ipflags1;
224 u8 iprcode;
225 u32 ipmsgid;
226 u8 ipaudit[3];
227 u8 res1[5];
228 u32 res2;
229 u32 ipsrccls;
230 u32 ipmsgtag;
231 u32 res3[3];
232} __attribute__ ((packed,aligned(8)));
233
234/*
235 * Set mask iucv structure. Used by iucv_enable_cpu.
236 */
237struct iucv_cmd_set_mask {
238 u8 ipmask;
239 u8 res1[2];
240 u8 iprcode;
241 u32 res2[9];
242} __attribute__ ((packed,aligned(8)));
243
244union iucv_param {
245 struct iucv_cmd_control ctrl;
246 struct iucv_cmd_dpl dpl;
247 struct iucv_cmd_db db;
248 struct iucv_cmd_purge purge;
249 struct iucv_cmd_set_mask set_mask;
250};
251
252/*
253 * Anchor for per-cpu IUCV command parameter block.
254 */
255static union iucv_param *iucv_param;
256
257/**
258 * iucv_call_b2f0
259 * @code: identifier of IUCV call to CP.
260 * @parm: pointer to a struct iucv_parm block
261 *
262 * Calls CP to execute IUCV commands.
263 *
264 * Returns the result of the CP IUCV call.
265 */
266static inline int iucv_call_b2f0(int command, union iucv_param *parm)
267{
268 register unsigned long reg0 asm ("0");
269 register unsigned long reg1 asm ("1");
270 int ccode;
271
272 reg0 = command;
273 reg1 = virt_to_phys(parm);
274 asm volatile(
275 " .long 0xb2f01000\n"
276 " ipm %0\n"
277 " srl %0,28\n"
278 : "=d" (ccode), "=m" (*parm), "+d" (reg0), "+a" (reg1)
279 : "m" (*parm) : "cc");
280 return (ccode == 1) ? parm->ctrl.iprcode : ccode;
281}
282
283/**
284 * iucv_query_maxconn
285 *
286 * Determines the maximum number of connections that may be established.
287 *
288 * Returns the maximum number of connections or -EPERM is IUCV is not
289 * available.
290 */
291static int iucv_query_maxconn(void)
292{
293 register unsigned long reg0 asm ("0");
294 register unsigned long reg1 asm ("1");
295 void *param;
296 int ccode;
297
298 param = kzalloc(sizeof(union iucv_param), GFP_KERNEL|GFP_DMA);
299 if (!param)
300 return -ENOMEM;
301 reg0 = IUCV_QUERY;
302 reg1 = (unsigned long) param;
303 asm volatile (
304 " .long 0xb2f01000\n"
305 " ipm %0\n"
306 " srl %0,28\n"
307 : "=d" (ccode), "+d" (reg0), "+d" (reg1) : : "cc");
308 if (ccode == 0)
309 iucv_max_pathid = reg0;
310 kfree(param);
311 return ccode ? -EPERM : 0;
312}
313
314/**
315 * iucv_allow_cpu
316 * @data: unused
317 *
318 * Allow iucv interrupts on this cpu.
319 */
320static void iucv_allow_cpu(void *data)
321{
322 int cpu = smp_processor_id();
323 union iucv_param *parm;
324
325 /*
326 * Enable all iucv interrupts.
327 * ipmask contains bits for the different interrupts
328 * 0x80 - Flag to allow nonpriority message pending interrupts
329 * 0x40 - Flag to allow priority message pending interrupts
330 * 0x20 - Flag to allow nonpriority message completion interrupts
331 * 0x10 - Flag to allow priority message completion interrupts
332 * 0x08 - Flag to allow IUCV control interrupts
333 */
334 parm = percpu_ptr(iucv_param, smp_processor_id());
335 memset(parm, 0, sizeof(union iucv_param));
336 parm->set_mask.ipmask = 0xf8;
337 iucv_call_b2f0(IUCV_SETMASK, parm);
338
339 /* Set indication that iucv interrupts are allowed for this cpu. */
340 cpu_set(cpu, iucv_irq_cpumask);
341}
342
343/**
344 * iucv_block_cpu
345 * @data: unused
346 *
347 * Block iucv interrupts on this cpu.
348 */
349static void iucv_block_cpu(void *data)
350{
351 int cpu = smp_processor_id();
352 union iucv_param *parm;
353
354 /* Disable all iucv interrupts. */
355 parm = percpu_ptr(iucv_param, smp_processor_id());
356 memset(parm, 0, sizeof(union iucv_param));
357 iucv_call_b2f0(IUCV_SETMASK, parm);
358
359 /* Clear indication that iucv interrupts are allowed for this cpu. */
360 cpu_clear(cpu, iucv_irq_cpumask);
361}
362
363/**
364 * iucv_declare_cpu
365 * @data: unused
366 *
367 * Declare a interupt buffer on this cpu.
368 */
369static void iucv_declare_cpu(void *data)
370{
371 int cpu = smp_processor_id();
372 union iucv_param *parm;
373 int rc;
374
375 if (cpu_isset(cpu, iucv_buffer_cpumask))
376 return;
377
378 /* Declare interrupt buffer. */
379 parm = percpu_ptr(iucv_param, cpu);
380 memset(parm, 0, sizeof(union iucv_param));
381 parm->db.ipbfadr1 = virt_to_phys(percpu_ptr(iucv_irq_data, cpu));
382 rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
383 if (rc) {
384 char *err = "Unknown";
385 switch(rc) {
386 case 0x03:
387 err = "Directory error";
388 break;
389 case 0x0a:
390 err = "Invalid length";
391 break;
392 case 0x13:
393 err = "Buffer already exists";
394 break;
395 case 0x3e:
396 err = "Buffer overlap";
397 break;
398 case 0x5c:
399 err = "Paging or storage error";
400 break;
401 }
402 printk(KERN_WARNING "iucv_register: iucv_declare_buffer "
403 "on cpu %i returned error 0x%02x (%s)\n", cpu, rc, err);
404 return;
405 }
406
407 /* Set indication that an iucv buffer exists for this cpu. */
408 cpu_set(cpu, iucv_buffer_cpumask);
409
410 if (iucv_nonsmp_handler == 0 || cpus_empty(iucv_irq_cpumask))
411 /* Enable iucv interrupts on this cpu. */
412 iucv_allow_cpu(NULL);
413 else
414 /* Disable iucv interrupts on this cpu. */
415 iucv_block_cpu(NULL);
416}
417
418/**
419 * iucv_retrieve_cpu
420 * @data: unused
421 *
422 * Retrieve interrupt buffer on this cpu.
423 */
424static void iucv_retrieve_cpu(void *data)
425{
426 int cpu = smp_processor_id();
427 union iucv_param *parm;
428
429 if (!cpu_isset(cpu, iucv_buffer_cpumask))
430 return;
431
432 /* Block iucv interrupts. */
433 iucv_block_cpu(NULL);
434
435 /* Retrieve interrupt buffer. */
436 parm = percpu_ptr(iucv_param, cpu);
437 iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
438
439 /* Clear indication that an iucv buffer exists for this cpu. */
440 cpu_clear(cpu, iucv_buffer_cpumask);
441}
442
443/**
444 * iucv_setmask_smp
445 *
446 * Allow iucv interrupts on all cpus.
447 */
448static void iucv_setmask_mp(void)
449{
450 int cpu;
451
452 for_each_online_cpu(cpu)
453 /* Enable all cpus with a declared buffer. */
454 if (cpu_isset(cpu, iucv_buffer_cpumask) &&
455 !cpu_isset(cpu, iucv_irq_cpumask))
456 smp_call_function_on(iucv_allow_cpu, NULL, 0, 1, cpu);
457}
458
459/**
460 * iucv_setmask_up
461 *
462 * Allow iucv interrupts on a single cpus.
463 */
464static void iucv_setmask_up(void)
465{
466 cpumask_t cpumask;
467 int cpu;
468
469 /* Disable all cpu but the first in cpu_irq_cpumask. */
470 cpumask = iucv_irq_cpumask;
471 cpu_clear(first_cpu(iucv_irq_cpumask), cpumask);
472 for_each_cpu_mask(cpu, cpumask)
473 smp_call_function_on(iucv_block_cpu, NULL, 0, 1, cpu);
474}
475
476/**
477 * iucv_enable
478 *
479 * This function makes iucv ready for use. It allocates the pathid
480 * table, declares an iucv interrupt buffer and enables the iucv
481 * interrupts. Called when the first user has registered an iucv
482 * handler.
483 */
484static int iucv_enable(void)
485{
486 size_t alloc_size;
487 int cpu, rc;
488
489 rc = -ENOMEM;
490 alloc_size = iucv_max_pathid * sizeof(struct iucv_path);
491 iucv_path_table = kzalloc(alloc_size, GFP_KERNEL);
492 if (!iucv_path_table)
493 goto out;
494 /* Declare per cpu buffers. */
495 rc = -EIO;
496 for_each_online_cpu(cpu)
497 smp_call_function_on(iucv_declare_cpu, NULL, 0, 1, cpu);
498 if (cpus_empty(iucv_buffer_cpumask))
499 /* No cpu could declare an iucv buffer. */
500 goto out_path;
501 return 0;
502
503out_path:
504 kfree(iucv_path_table);
505out:
506 return rc;
507}
508
509/**
510 * iucv_disable
511 *
512 * This function shuts down iucv. It disables iucv interrupts, retrieves
513 * the iucv interrupt buffer and frees the pathid table. Called after the
514 * last user unregister its iucv handler.
515 */
516static void iucv_disable(void)
517{
518 on_each_cpu(iucv_retrieve_cpu, NULL, 0, 1);
519 kfree(iucv_path_table);
520}
521
522#ifdef CONFIG_HOTPLUG_CPU
523static int __cpuinit iucv_cpu_notify(struct notifier_block *self,
524 unsigned long action, void *hcpu)
525{
526 cpumask_t cpumask;
527 long cpu = (long) hcpu;
528
529 switch (action) {
530 case CPU_UP_PREPARE:
531 if (!percpu_populate(iucv_irq_data,
532 sizeof(struct iucv_irq_data),
533 GFP_KERNEL|GFP_DMA, cpu))
534 return NOTIFY_BAD;
535 if (!percpu_populate(iucv_param, sizeof(union iucv_param),
536 GFP_KERNEL|GFP_DMA, cpu)) {
537 percpu_depopulate(iucv_irq_data, cpu);
538 return NOTIFY_BAD;
539 }
540 break;
541 case CPU_UP_CANCELED:
542 case CPU_DEAD:
543 percpu_depopulate(iucv_param, cpu);
544 percpu_depopulate(iucv_irq_data, cpu);
545 break;
546 case CPU_ONLINE:
547 case CPU_DOWN_FAILED:
548 smp_call_function_on(iucv_declare_cpu, NULL, 0, 1, cpu);
549 break;
550 case CPU_DOWN_PREPARE:
551 cpumask = iucv_buffer_cpumask;
552 cpu_clear(cpu, cpumask);
553 if (cpus_empty(cpumask))
554 /* Can't offline last IUCV enabled cpu. */
555 return NOTIFY_BAD;
556 smp_call_function_on(iucv_retrieve_cpu, NULL, 0, 1, cpu);
557 if (cpus_empty(iucv_irq_cpumask))
558 smp_call_function_on(iucv_allow_cpu, NULL, 0, 1,
559 first_cpu(iucv_buffer_cpumask));
560 break;
561 }
562 return NOTIFY_OK;
563}
564
565static struct notifier_block iucv_cpu_notifier = {
566 .notifier_call = iucv_cpu_notify,
567};
568#endif
569
570/**
571 * iucv_sever_pathid
572 * @pathid: path identification number.
573 * @userdata: 16-bytes of user data.
574 *
575 * Sever an iucv path to free up the pathid. Used internally.
576 */
577static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
578{
579 union iucv_param *parm;
580
581 parm = percpu_ptr(iucv_param, smp_processor_id());
582 memset(parm, 0, sizeof(union iucv_param));
583 if (userdata)
584 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
585 parm->ctrl.ippathid = pathid;
586 return iucv_call_b2f0(IUCV_SEVER, parm);
587}
588
589/**
590 * __iucv_cleanup_pathid
591 * @dummy: unused dummy argument
592 *
593 * Nop function called via smp_call_function to force work items from
594 * pending external iucv interrupts to the work queue.
595 */
596static void __iucv_cleanup_pathid(void *dummy)
597{
598}
599
600/**
601 * iucv_cleanup_pathid
602 * @pathid: 16 bit pathid
603 *
604 * Function called after a path has been severed to find all remaining
605 * work items for the now stale pathid. The caller needs to hold the
606 * iucv_table_lock.
607 */
608static void iucv_cleanup_pathid(u16 pathid)
609{
610 struct iucv_work *p, *n;
611
612 /*
613 * Path is severed, the pathid can be reused immediatly on
614 * a iucv connect or a connection pending interrupt.
615 * iucv_path_connect and connection pending interrupt will
616 * wait until the iucv_table_lock is released before the
617 * recycled pathid enters the system.
618 * Force remaining interrupts to the work queue, then
619 * scan the work queue for items of this path.
620 */
621 smp_call_function(__iucv_cleanup_pathid, NULL, 0, 1);
622 spin_lock_irq(&iucv_work_lock);
623 list_for_each_entry_safe(p, n, &iucv_work_queue, list) {
624 /* Remove work items for pathid except connection pending */
625 if (p->data.ippathid == pathid && p->data.iptype != 0x01) {
626 list_del(&p->list);
627 kfree(p);
628 }
629 }
630 spin_unlock_irq(&iucv_work_lock);
631}
632
633/**
634 * iucv_register:
635 * @handler: address of iucv handler structure
636 * @smp: != 0 indicates that the handler can deal with out of order messages
637 *
638 * Registers a driver with IUCV.
639 *
640 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
641 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
642 */
643int iucv_register(struct iucv_handler *handler, int smp)
644{
645 int rc;
646
647 if (!iucv_available)
648 return -ENOSYS;
649 mutex_lock(&iucv_register_mutex);
650 if (!smp)
651 iucv_nonsmp_handler++;
652 if (list_empty(&iucv_handler_list)) {
653 rc = iucv_enable();
654 if (rc)
655 goto out_mutex;
656 } else if (!smp && iucv_nonsmp_handler == 1)
657 iucv_setmask_up();
658 INIT_LIST_HEAD(&handler->paths);
659
660 spin_lock_irq(&iucv_table_lock);
661 list_add_tail(&handler->list, &iucv_handler_list);
662 spin_unlock_irq(&iucv_table_lock);
663 rc = 0;
664out_mutex:
665 mutex_unlock(&iucv_register_mutex);
666 return rc;
667}
668
669/**
670 * iucv_unregister
671 * @handler: address of iucv handler structure
672 * @smp: != 0 indicates that the handler can deal with out of order messages
673 *
674 * Unregister driver from IUCV.
675 */
676void iucv_unregister(struct iucv_handler *handler, int smp)
677{
678 struct iucv_path *p, *n;
679
680 mutex_lock(&iucv_register_mutex);
681 spin_lock_bh(&iucv_table_lock);
682 /* Remove handler from the iucv_handler_list. */
683 list_del_init(&handler->list);
684 /* Sever all pathids still refering to the handler. */
685 list_for_each_entry_safe(p, n, &handler->paths, list) {
686 iucv_sever_pathid(p->pathid, NULL);
687 iucv_path_table[p->pathid] = NULL;
688 list_del(&p->list);
689 iucv_cleanup_pathid(p->pathid);
690 iucv_path_free(p);
691 }
692 spin_unlock_bh(&iucv_table_lock);
693 if (!smp)
694 iucv_nonsmp_handler--;
695 if (list_empty(&iucv_handler_list))
696 iucv_disable();
697 else if (!smp && iucv_nonsmp_handler == 0)
698 iucv_setmask_mp();
699 mutex_unlock(&iucv_register_mutex);
700}
701
702/**
703 * iucv_path_accept
704 * @path: address of iucv path structure
705 * @handler: address of iucv handler structure
706 * @userdata: 16 bytes of data reflected to the communication partner
707 * @private: private data passed to interrupt handlers for this path
708 *
709 * This function is issued after the user received a connection pending
710 * external interrupt and now wishes to complete the IUCV communication path.
711 *
712 * Returns the result of the CP IUCV call.
713 */
714int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
715 u8 userdata[16], void *private)
716{
717 union iucv_param *parm;
718 int rc;
719
720 local_bh_disable();
721 /* Prepare parameter block. */
722 parm = percpu_ptr(iucv_param, smp_processor_id());
723 memset(parm, 0, sizeof(union iucv_param));
724 parm->ctrl.ippathid = path->pathid;
725 parm->ctrl.ipmsglim = path->msglim;
726 if (userdata)
727 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
728 parm->ctrl.ipflags1 = path->flags;
729
730 rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
731 if (!rc) {
732 path->private = private;
733 path->msglim = parm->ctrl.ipmsglim;
734 path->flags = parm->ctrl.ipflags1;
735 }
736 local_bh_enable();
737 return rc;
738}
739
740/**
741 * iucv_path_connect
742 * @path: address of iucv path structure
743 * @handler: address of iucv handler structure
744 * @userid: 8-byte user identification
745 * @system: 8-byte target system identification
746 * @userdata: 16 bytes of data reflected to the communication partner
747 * @private: private data passed to interrupt handlers for this path
748 *
749 * This function establishes an IUCV path. Although the connect may complete
750 * successfully, you are not able to use the path until you receive an IUCV
751 * Connection Complete external interrupt.
752 *
753 * Returns the result of the CP IUCV call.
754 */
755int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
756 u8 userid[8], u8 system[8], u8 userdata[16],
757 void *private)
758{
759 union iucv_param *parm;
760 int rc;
761
762 preempt_disable();
763 if (iucv_tasklet_cpu != smp_processor_id())
764 spin_lock_bh(&iucv_table_lock);
765 parm = percpu_ptr(iucv_param, smp_processor_id());
766 memset(parm, 0, sizeof(union iucv_param));
767 parm->ctrl.ipmsglim = path->msglim;
768 parm->ctrl.ipflags1 = path->flags;
769 if (userid) {
770 memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
771 ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
772 EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
773 }
774 if (system) {
775 memcpy(parm->ctrl.iptarget, system,
776 sizeof(parm->ctrl.iptarget));
777 ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
778 EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
779 }
780 if (userdata)
781 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
782
783 rc = iucv_call_b2f0(IUCV_CONNECT, parm);
784 if (!rc) {
785 if (parm->ctrl.ippathid < iucv_max_pathid) {
786 path->pathid = parm->ctrl.ippathid;
787 path->msglim = parm->ctrl.ipmsglim;
788 path->flags = parm->ctrl.ipflags1;
789 path->handler = handler;
790 path->private = private;
791 list_add_tail(&path->list, &handler->paths);
792 iucv_path_table[path->pathid] = path;
793 } else {
794 iucv_sever_pathid(parm->ctrl.ippathid,
795 iucv_error_pathid);
796 rc = -EIO;
797 }
798 }
799 if (iucv_tasklet_cpu != smp_processor_id())
800 spin_unlock_bh(&iucv_table_lock);
801 preempt_enable();
802 return rc;
803}
804
805/**
806 * iucv_path_quiesce:
807 * @path: address of iucv path structure
808 * @userdata: 16 bytes of data reflected to the communication partner
809 *
810 * This function temporarily suspends incoming messages on an IUCV path.
811 * You can later reactivate the path by invoking the iucv_resume function.
812 *
813 * Returns the result from the CP IUCV call.
814 */
815int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
816{
817 union iucv_param *parm;
818 int rc;
819
820 local_bh_disable();
821 parm = percpu_ptr(iucv_param, smp_processor_id());
822 memset(parm, 0, sizeof(union iucv_param));
823 if (userdata)
824 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
825 parm->ctrl.ippathid = path->pathid;
826 rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
827 local_bh_enable();
828 return rc;
829}
830
831/**
832 * iucv_path_resume:
833 * @path: address of iucv path structure
834 * @userdata: 16 bytes of data reflected to the communication partner
835 *
836 * This function resumes incoming messages on an IUCV path that has
837 * been stopped with iucv_path_quiesce.
838 *
839 * Returns the result from the CP IUCV call.
840 */
841int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
842{
843 union iucv_param *parm;
844 int rc;
845
846 local_bh_disable();
847 parm = percpu_ptr(iucv_param, smp_processor_id());
848 memset(parm, 0, sizeof(union iucv_param));
849 if (userdata)
850 memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
851 parm->ctrl.ippathid = path->pathid;
852 rc = iucv_call_b2f0(IUCV_RESUME, parm);
853 local_bh_enable();
854 return rc;
855}
856
857/**
858 * iucv_path_sever
859 * @path: address of iucv path structure
860 * @userdata: 16 bytes of data reflected to the communication partner
861 *
862 * This function terminates an IUCV path.
863 *
864 * Returns the result from the CP IUCV call.
865 */
866int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
867{
868 int rc;
869
870
871 preempt_disable();
872 if (iucv_tasklet_cpu != smp_processor_id())
873 spin_lock_bh(&iucv_table_lock);
874 rc = iucv_sever_pathid(path->pathid, userdata);
875 if (!rc) {
876 iucv_path_table[path->pathid] = NULL;
877 list_del_init(&path->list);
878 iucv_cleanup_pathid(path->pathid);
879 }
880 if (iucv_tasklet_cpu != smp_processor_id())
881 spin_unlock_bh(&iucv_table_lock);
882 preempt_enable();
883 return rc;
884}
885
886/**
887 * iucv_message_purge
888 * @path: address of iucv path structure
889 * @msg: address of iucv msg structure
890 * @srccls: source class of message
891 *
892 * Cancels a message you have sent.
893 *
894 * Returns the result from the CP IUCV call.
895 */
896int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
897 u32 srccls)
898{
899 union iucv_param *parm;
900 int rc;
901
902 local_bh_disable();
903 parm = percpu_ptr(iucv_param, smp_processor_id());
904 memset(parm, 0, sizeof(union iucv_param));
905 parm->purge.ippathid = path->pathid;
906 parm->purge.ipmsgid = msg->id;
907 parm->purge.ipsrccls = srccls;
908 parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
909 rc = iucv_call_b2f0(IUCV_PURGE, parm);
910 if (!rc) {
911 msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
912 msg->tag = parm->purge.ipmsgtag;
913 }
914 local_bh_enable();
915 return rc;
916}
917
918/**
919 * iucv_message_receive
920 * @path: address of iucv path structure
921 * @msg: address of iucv msg structure
922 * @flags: how the message is received (IUCV_IPBUFLST)
923 * @buffer: address of data buffer or address of struct iucv_array
924 * @size: length of data buffer
925 * @residual:
926 *
927 * This function receives messages that are being sent to you over
928 * established paths. This function will deal with RMDATA messages
929 * embedded in struct iucv_message as well.
930 *
931 * Returns the result from the CP IUCV call.
932 */
933int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
934 u8 flags, void *buffer, size_t size, size_t *residual)
935{
936 union iucv_param *parm;
937 struct iucv_array *array;
938 u8 *rmmsg;
939 size_t copy;
940 int rc;
941
942 if (msg->flags & IUCV_IPRMDATA) {
943 /*
944 * Message is 8 bytes long and has been stored to the
945 * message descriptor itself.
946 */
947 rc = (size < 8) ? 5 : 0;
948 if (residual)
949 *residual = abs(size - 8);
950 rmmsg = msg->rmmsg;
951 if (flags & IUCV_IPBUFLST) {
952 /* Copy to struct iucv_array. */
953 size = (size < 8) ? size : 8;
954 for (array = buffer; size > 0; array++) {
955 copy = min_t(size_t, size, array->length);
956 memcpy((u8 *)(addr_t) array->address,
957 rmmsg, copy);
958 rmmsg += copy;
959 size -= copy;
960 }
961 } else {
962 /* Copy to direct buffer. */
963 memcpy(buffer, rmmsg, min_t(size_t, size, 8));
964 }
965 return 0;
966 }
967
968 local_bh_disable();
969 parm = percpu_ptr(iucv_param, smp_processor_id());
970 memset(parm, 0, sizeof(union iucv_param));
971 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
972 parm->db.ipbfln1f = (u32) size;
973 parm->db.ipmsgid = msg->id;
974 parm->db.ippathid = path->pathid;
975 parm->db.iptrgcls = msg->class;
976 parm->db.ipflags1 = (flags | IUCV_IPFGPID |
977 IUCV_IPFGMID | IUCV_IPTRGCLS);
978 rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
979 if (!rc || rc == 5) {
980 msg->flags = parm->db.ipflags1;
981 if (residual)
982 *residual = parm->db.ipbfln1f;
983 }
984 local_bh_enable();
985 return rc;
986}
987
988/**
989 * iucv_message_reject
990 * @path: address of iucv path structure
991 * @msg: address of iucv msg structure
992 *
993 * The reject function refuses a specified message. Between the time you
994 * are notified of a message and the time that you complete the message,
995 * the message may be rejected.
996 *
997 * Returns the result from the CP IUCV call.
998 */
999int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
1000{
1001 union iucv_param *parm;
1002 int rc;
1003
1004 local_bh_disable();
1005 parm = percpu_ptr(iucv_param, smp_processor_id());
1006 memset(parm, 0, sizeof(union iucv_param));
1007 parm->db.ippathid = path->pathid;
1008 parm->db.ipmsgid = msg->id;
1009 parm->db.iptrgcls = msg->class;
1010 parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
1011 rc = iucv_call_b2f0(IUCV_REJECT, parm);
1012 local_bh_enable();
1013 return rc;
1014}
1015
1016/**
1017 * iucv_message_reply
1018 * @path: address of iucv path structure
1019 * @msg: address of iucv msg structure
1020 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1021 * @reply: address of reply data buffer or address of struct iucv_array
1022 * @size: length of reply data buffer
1023 *
1024 * This function responds to the two-way messages that you receive. You
1025 * must identify completely the message to which you wish to reply. ie,
1026 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
1027 * the parameter list.
1028 *
1029 * Returns the result from the CP IUCV call.
1030 */
1031int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
1032 u8 flags, void *reply, size_t size)
1033{
1034 union iucv_param *parm;
1035 int rc;
1036
1037 local_bh_disable();
1038 parm = percpu_ptr(iucv_param, smp_processor_id());
1039 memset(parm, 0, sizeof(union iucv_param));
1040 if (flags & IUCV_IPRMDATA) {
1041 parm->dpl.ippathid = path->pathid;
1042 parm->dpl.ipflags1 = flags;
1043 parm->dpl.ipmsgid = msg->id;
1044 parm->dpl.iptrgcls = msg->class;
1045 memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
1046 } else {
1047 parm->db.ipbfadr1 = (u32)(addr_t) reply;
1048 parm->db.ipbfln1f = (u32) size;
1049 parm->db.ippathid = path->pathid;
1050 parm->db.ipflags1 = flags;
1051 parm->db.ipmsgid = msg->id;
1052 parm->db.iptrgcls = msg->class;
1053 }
1054 rc = iucv_call_b2f0(IUCV_REPLY, parm);
1055 local_bh_enable();
1056 return rc;
1057}
1058
1059/**
1060 * iucv_message_send
1061 * @path: address of iucv path structure
1062 * @msg: address of iucv msg structure
1063 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
1064 * @srccls: source class of message
1065 * @buffer: address of send buffer or address of struct iucv_array
1066 * @size: length of send buffer
1067 *
1068 * This function transmits data to another application. Data to be
1069 * transmitted is in a buffer and this is a one-way message and the
1070 * receiver will not reply to the message.
1071 *
1072 * Returns the result from the CP IUCV call.
1073 */
1074int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
1075 u8 flags, u32 srccls, void *buffer, size_t size)
1076{
1077 union iucv_param *parm;
1078 int rc;
1079
1080 local_bh_disable();
1081 parm = percpu_ptr(iucv_param, smp_processor_id());
1082 memset(parm, 0, sizeof(union iucv_param));
1083 if (flags & IUCV_IPRMDATA) {
1084 /* Message of 8 bytes can be placed into the parameter list. */
1085 parm->dpl.ippathid = path->pathid;
1086 parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
1087 parm->dpl.iptrgcls = msg->class;
1088 parm->dpl.ipsrccls = srccls;
1089 parm->dpl.ipmsgtag = msg->tag;
1090 memcpy(parm->dpl.iprmmsg, buffer, 8);
1091 } else {
1092 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1093 parm->db.ipbfln1f = (u32) size;
1094 parm->db.ippathid = path->pathid;
1095 parm->db.ipflags1 = flags | IUCV_IPNORPY;
1096 parm->db.iptrgcls = msg->class;
1097 parm->db.ipsrccls = srccls;
1098 parm->db.ipmsgtag = msg->tag;
1099 }
1100 rc = iucv_call_b2f0(IUCV_SEND, parm);
1101 if (!rc)
1102 msg->id = parm->db.ipmsgid;
1103 local_bh_enable();
1104 return rc;
1105}
1106
1107/**
1108 * iucv_message_send2way
1109 * @path: address of iucv path structure
1110 * @msg: address of iucv msg structure
1111 * @flags: how the message is sent and the reply is received
1112 * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
1113 * @srccls: source class of message
1114 * @buffer: address of send buffer or address of struct iucv_array
1115 * @size: length of send buffer
1116 * @ansbuf: address of answer buffer or address of struct iucv_array
1117 * @asize: size of reply buffer
1118 *
1119 * This function transmits data to another application. Data to be
1120 * transmitted is in a buffer. The receiver of the send is expected to
1121 * reply to the message and a buffer is provided into which IUCV moves
1122 * the reply to this message.
1123 *
1124 * Returns the result from the CP IUCV call.
1125 */
1126int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
1127 u8 flags, u32 srccls, void *buffer, size_t size,
1128 void *answer, size_t asize, size_t *residual)
1129{
1130 union iucv_param *parm;
1131 int rc;
1132
1133 local_bh_disable();
1134 parm = percpu_ptr(iucv_param, smp_processor_id());
1135 memset(parm, 0, sizeof(union iucv_param));
1136 if (flags & IUCV_IPRMDATA) {
1137 parm->dpl.ippathid = path->pathid;
1138 parm->dpl.ipflags1 = path->flags; /* priority message */
1139 parm->dpl.iptrgcls = msg->class;
1140 parm->dpl.ipsrccls = srccls;
1141 parm->dpl.ipmsgtag = msg->tag;
1142 parm->dpl.ipbfadr2 = (u32)(addr_t) answer;
1143 parm->dpl.ipbfln2f = (u32) asize;
1144 memcpy(parm->dpl.iprmmsg, buffer, 8);
1145 } else {
1146 parm->db.ippathid = path->pathid;
1147 parm->db.ipflags1 = path->flags; /* priority message */
1148 parm->db.iptrgcls = msg->class;
1149 parm->db.ipsrccls = srccls;
1150 parm->db.ipmsgtag = msg->tag;
1151 parm->db.ipbfadr1 = (u32)(addr_t) buffer;
1152 parm->db.ipbfln1f = (u32) size;
1153 parm->db.ipbfadr2 = (u32)(addr_t) answer;
1154 parm->db.ipbfln2f = (u32) asize;
1155 }
1156 rc = iucv_call_b2f0(IUCV_SEND, parm);
1157 if (!rc)
1158 msg->id = parm->db.ipmsgid;
1159 local_bh_enable();
1160 return rc;
1161}
1162
1163/**
1164 * iucv_path_pending
1165 * @data: Pointer to external interrupt buffer
1166 *
1167 * Process connection pending work item. Called from tasklet while holding
1168 * iucv_table_lock.
1169 */
1170struct iucv_path_pending {
1171 u16 ippathid;
1172 u8 ipflags1;
1173 u8 iptype;
1174 u16 ipmsglim;
1175 u16 res1;
1176 u8 ipvmid[8];
1177 u8 ipuser[16];
1178 u32 res3;
1179 u8 ippollfg;
1180 u8 res4[3];
1181} __attribute__ ((packed));
1182
1183static void iucv_path_pending(struct iucv_irq_data *data)
1184{
1185 struct iucv_path_pending *ipp = (void *) data;
1186 struct iucv_handler *handler;
1187 struct iucv_path *path;
1188 char *error;
1189
1190 BUG_ON(iucv_path_table[ipp->ippathid]);
1191 /* New pathid, handler found. Create a new path struct. */
1192 error = iucv_error_no_memory;
1193 path = iucv_path_alloc(ipp->ipmsglim, ipp->ipflags1, GFP_ATOMIC);
1194 if (!path)
1195 goto out_sever;
1196 path->pathid = ipp->ippathid;
1197 iucv_path_table[path->pathid] = path;
1198 EBCASC(ipp->ipvmid, 8);
1199
1200 /* Call registered handler until one is found that wants the path. */
1201 list_for_each_entry(handler, &iucv_handler_list, list) {
1202 if (!handler->path_pending)
1203 continue;
1204 /*
1205 * Add path to handler to allow a call to iucv_path_sever
1206 * inside the path_pending function. If the handler returns
1207 * an error remove the path from the handler again.
1208 */
1209 list_add(&path->list, &handler->paths);
1210 path->handler = handler;
1211 if (!handler->path_pending(path, ipp->ipvmid, ipp->ipuser))
1212 return;
1213 list_del(&path->list);
1214 path->handler = NULL;
1215 }
1216 /* No handler wanted the path. */
1217 iucv_path_table[path->pathid] = NULL;
1218 iucv_path_free(path);
1219 error = iucv_error_no_listener;
1220out_sever:
1221 iucv_sever_pathid(ipp->ippathid, error);
1222}
1223
1224/**
1225 * iucv_path_complete
1226 * @data: Pointer to external interrupt buffer
1227 *
1228 * Process connection complete work item. Called from tasklet while holding
1229 * iucv_table_lock.
1230 */
1231struct iucv_path_complete {
1232 u16 ippathid;
1233 u8 ipflags1;
1234 u8 iptype;
1235 u16 ipmsglim;
1236 u16 res1;
1237 u8 res2[8];
1238 u8 ipuser[16];
1239 u32 res3;
1240 u8 ippollfg;
1241 u8 res4[3];
1242} __attribute__ ((packed));
1243
1244static void iucv_path_complete(struct iucv_irq_data *data)
1245{
1246 struct iucv_path_complete *ipc = (void *) data;
1247 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1248
1249 BUG_ON(!path || !path->handler);
1250 if (path->handler->path_complete)
1251 path->handler->path_complete(path, ipc->ipuser);
1252}
1253
1254/**
1255 * iucv_path_severed
1256 * @data: Pointer to external interrupt buffer
1257 *
1258 * Process connection severed work item. Called from tasklet while holding
1259 * iucv_table_lock.
1260 */
1261struct iucv_path_severed {
1262 u16 ippathid;
1263 u8 res1;
1264 u8 iptype;
1265 u32 res2;
1266 u8 res3[8];
1267 u8 ipuser[16];
1268 u32 res4;
1269 u8 ippollfg;
1270 u8 res5[3];
1271} __attribute__ ((packed));
1272
1273static void iucv_path_severed(struct iucv_irq_data *data)
1274{
1275 struct iucv_path_severed *ips = (void *) data;
1276 struct iucv_path *path = iucv_path_table[ips->ippathid];
1277
1278 BUG_ON(!path || !path->handler);
1279 if (path->handler->path_severed)
1280 path->handler->path_severed(path, ips->ipuser);
1281 else {
1282 iucv_sever_pathid(path->pathid, NULL);
1283 iucv_path_table[path->pathid] = NULL;
1284 list_del_init(&path->list);
1285 iucv_cleanup_pathid(path->pathid);
1286 iucv_path_free(path);
1287 }
1288}
1289
1290/**
1291 * iucv_path_quiesced
1292 * @data: Pointer to external interrupt buffer
1293 *
1294 * Process connection quiesced work item. Called from tasklet while holding
1295 * iucv_table_lock.
1296 */
1297struct iucv_path_quiesced {
1298 u16 ippathid;
1299 u8 res1;
1300 u8 iptype;
1301 u32 res2;
1302 u8 res3[8];
1303 u8 ipuser[16];
1304 u32 res4;
1305 u8 ippollfg;
1306 u8 res5[3];
1307} __attribute__ ((packed));
1308
1309static void iucv_path_quiesced(struct iucv_irq_data *data)
1310{
1311 struct iucv_path_quiesced *ipq = (void *) data;
1312 struct iucv_path *path = iucv_path_table[ipq->ippathid];
1313
1314 BUG_ON(!path || !path->handler);
1315 if (path->handler->path_quiesced)
1316 path->handler->path_quiesced(path, ipq->ipuser);
1317}
1318
1319/**
1320 * iucv_path_resumed
1321 * @data: Pointer to external interrupt buffer
1322 *
1323 * Process connection resumed work item. Called from tasklet while holding
1324 * iucv_table_lock.
1325 */
1326struct iucv_path_resumed {
1327 u16 ippathid;
1328 u8 res1;
1329 u8 iptype;
1330 u32 res2;
1331 u8 res3[8];
1332 u8 ipuser[16];
1333 u32 res4;
1334 u8 ippollfg;
1335 u8 res5[3];
1336} __attribute__ ((packed));
1337
1338static void iucv_path_resumed(struct iucv_irq_data *data)
1339{
1340 struct iucv_path_resumed *ipr = (void *) data;
1341 struct iucv_path *path = iucv_path_table[ipr->ippathid];
1342
1343 BUG_ON(!path || !path->handler);
1344 if (path->handler->path_resumed)
1345 path->handler->path_resumed(path, ipr->ipuser);
1346}
1347
1348/**
1349 * iucv_message_complete
1350 * @data: Pointer to external interrupt buffer
1351 *
1352 * Process message complete work item. Called from tasklet while holding
1353 * iucv_table_lock.
1354 */
1355struct iucv_message_complete {
1356 u16 ippathid;
1357 u8 ipflags1;
1358 u8 iptype;
1359 u32 ipmsgid;
1360 u32 ipaudit;
1361 u8 iprmmsg[8];
1362 u32 ipsrccls;
1363 u32 ipmsgtag;
1364 u32 res;
1365 u32 ipbfln2f;
1366 u8 ippollfg;
1367 u8 res2[3];
1368} __attribute__ ((packed));
1369
1370static void iucv_message_complete(struct iucv_irq_data *data)
1371{
1372 struct iucv_message_complete *imc = (void *) data;
1373 struct iucv_path *path = iucv_path_table[imc->ippathid];
1374 struct iucv_message msg;
1375
1376 BUG_ON(!path || !path->handler);
1377 if (path->handler->message_complete) {
1378 msg.flags = imc->ipflags1;
1379 msg.id = imc->ipmsgid;
1380 msg.audit = imc->ipaudit;
1381 memcpy(msg.rmmsg, imc->iprmmsg, 8);
1382 msg.class = imc->ipsrccls;
1383 msg.tag = imc->ipmsgtag;
1384 msg.length = imc->ipbfln2f;
1385 path->handler->message_complete(path, &msg);
1386 }
1387}
1388
1389/**
1390 * iucv_message_pending
1391 * @data: Pointer to external interrupt buffer
1392 *
1393 * Process message pending work item. Called from tasklet while holding
1394 * iucv_table_lock.
1395 */
1396struct iucv_message_pending {
1397 u16 ippathid;
1398 u8 ipflags1;
1399 u8 iptype;
1400 u32 ipmsgid;
1401 u32 iptrgcls;
1402 union {
1403 u32 iprmmsg1_u32;
1404 u8 iprmmsg1[4];
1405 } ln1msg1;
1406 union {
1407 u32 ipbfln1f;
1408 u8 iprmmsg2[4];
1409 } ln1msg2;
1410 u32 res1[3];
1411 u32 ipbfln2f;
1412 u8 ippollfg;
1413 u8 res2[3];
1414} __attribute__ ((packed));
1415
1416static void iucv_message_pending(struct iucv_irq_data *data)
1417{
1418 struct iucv_message_pending *imp = (void *) data;
1419 struct iucv_path *path = iucv_path_table[imp->ippathid];
1420 struct iucv_message msg;
1421
1422 BUG_ON(!path || !path->handler);
1423 if (path->handler->message_pending) {
1424 msg.flags = imp->ipflags1;
1425 msg.id = imp->ipmsgid;
1426 msg.class = imp->iptrgcls;
1427 if (imp->ipflags1 & IUCV_IPRMDATA) {
1428 memcpy(msg.rmmsg, imp->ln1msg1.iprmmsg1, 8);
1429 msg.length = 8;
1430 } else
1431 msg.length = imp->ln1msg2.ipbfln1f;
1432 msg.reply_size = imp->ipbfln2f;
1433 path->handler->message_pending(path, &msg);
1434 }
1435}
1436
1437/**
1438 * iucv_tasklet_handler:
1439 *
1440 * This tasklet loops over the queue of irq buffers created by
1441 * iucv_external_interrupt, calls the appropriate action handler
1442 * and then frees the buffer.
1443 */
1444static void iucv_tasklet_handler(unsigned long ignored)
1445{
1446 typedef void iucv_irq_fn(struct iucv_irq_data *);
1447 static iucv_irq_fn *irq_fn[] = {
1448 [0x01] = iucv_path_pending,
1449 [0x02] = iucv_path_complete,
1450 [0x03] = iucv_path_severed,
1451 [0x04] = iucv_path_quiesced,
1452 [0x05] = iucv_path_resumed,
1453 [0x06] = iucv_message_complete,
1454 [0x07] = iucv_message_complete,
1455 [0x08] = iucv_message_pending,
1456 [0x09] = iucv_message_pending,
1457 };
1458 struct iucv_work *p;
1459
1460 /* Serialize tasklet, iucv_path_sever and iucv_path_connect. */
1461 spin_lock(&iucv_table_lock);
1462 iucv_tasklet_cpu = smp_processor_id();
1463
1464 spin_lock_irq(&iucv_work_lock);
1465 while (!list_empty(&iucv_work_queue)) {
1466 p = list_entry(iucv_work_queue.next, struct iucv_work, list);
1467 list_del_init(&p->list);
1468 spin_unlock_irq(&iucv_work_lock);
1469 irq_fn[p->data.iptype](&p->data);
1470 kfree(p);
1471 spin_lock_irq(&iucv_work_lock);
1472 }
1473 spin_unlock_irq(&iucv_work_lock);
1474
1475 iucv_tasklet_cpu = -1;
1476 spin_unlock(&iucv_table_lock);
1477}
1478
1479/**
1480 * iucv_external_interrupt
1481 * @code: irq code
1482 *
1483 * Handles external interrupts coming in from CP.
1484 * Places the interrupt buffer on a queue and schedules iucv_tasklet_handler().
1485 */
1486static void iucv_external_interrupt(u16 code)
1487{
1488 struct iucv_irq_data *p;
1489 struct iucv_work *work;
1490
1491 p = percpu_ptr(iucv_irq_data, smp_processor_id());
1492 if (p->ippathid >= iucv_max_pathid) {
1493 printk(KERN_WARNING "iucv_do_int: Got interrupt with "
1494 "pathid %d > max_connections (%ld)\n",
1495 p->ippathid, iucv_max_pathid - 1);
1496 iucv_sever_pathid(p->ippathid, iucv_error_no_listener);
1497 return;
1498 }
1499 if (p->iptype < 0x01 || p->iptype > 0x09) {
1500 printk(KERN_ERR "iucv_do_int: unknown iucv interrupt\n");
1501 return;
1502 }
1503 work = kmalloc(sizeof(struct iucv_work), GFP_ATOMIC);
1504 if (!work) {
1505 printk(KERN_WARNING "iucv_external_interrupt: out of memory\n");
1506 return;
1507 }
1508 memcpy(&work->data, p, sizeof(work->data));
1509 spin_lock(&iucv_work_lock);
1510 list_add_tail(&work->list, &iucv_work_queue);
1511 spin_unlock(&iucv_work_lock);
1512 tasklet_schedule(&iucv_tasklet);
1513}
1514
1515/**
1516 * iucv_init
1517 *
1518 * Allocates and initializes various data structures.
1519 */
1520static int iucv_init(void)
1521{
1522 int rc;
1523
1524 if (!MACHINE_IS_VM) {
1525 rc = -EPROTONOSUPPORT;
1526 goto out;
1527 }
1528 rc = iucv_query_maxconn();
1529 if (rc)
1530 goto out;
1531 rc = register_external_interrupt (0x4000, iucv_external_interrupt);
1532 if (rc)
1533 goto out;
1534 rc = bus_register(&iucv_bus);
1535 if (rc)
1536 goto out_int;
1537 iucv_root = s390_root_dev_register("iucv");
1538 if (IS_ERR(iucv_root)) {
1539 rc = PTR_ERR(iucv_root);
1540 goto out_bus;
1541 }
1542 /* Note: GFP_DMA used used to get memory below 2G */
1543 iucv_irq_data = percpu_alloc(sizeof(struct iucv_irq_data),
1544 GFP_KERNEL|GFP_DMA);
1545 if (!iucv_irq_data) {
1546 rc = -ENOMEM;
1547 goto out_root;
1548 }
1549 /* Allocate parameter blocks. */
1550 iucv_param = percpu_alloc(sizeof(union iucv_param),
1551 GFP_KERNEL|GFP_DMA);
1552 if (!iucv_param) {
1553 rc = -ENOMEM;
1554 goto out_extint;
1555 }
1556 register_hotcpu_notifier(&iucv_cpu_notifier);
1557 ASCEBC(iucv_error_no_listener, 16);
1558 ASCEBC(iucv_error_no_memory, 16);
1559 ASCEBC(iucv_error_pathid, 16);
1560 iucv_available = 1;
1561 return 0;
1562
1563out_extint:
1564 percpu_free(iucv_irq_data);
1565out_root:
1566 s390_root_dev_unregister(iucv_root);
1567out_bus:
1568 bus_unregister(&iucv_bus);
1569out_int:
1570 unregister_external_interrupt(0x4000, iucv_external_interrupt);
1571out:
1572 return rc;
1573}
1574
1575/**
1576 * iucv_exit
1577 *
1578 * Frees everything allocated from iucv_init.
1579 */
1580static void iucv_exit(void)
1581{
1582 struct iucv_work *p, *n;
1583
1584 spin_lock_irq(&iucv_work_lock);
1585 list_for_each_entry_safe(p, n, &iucv_work_queue, list)
1586 kfree(p);
1587 spin_unlock_irq(&iucv_work_lock);
1588 unregister_hotcpu_notifier(&iucv_cpu_notifier);
1589 percpu_free(iucv_param);
1590 percpu_free(iucv_irq_data);
1591 s390_root_dev_unregister(iucv_root);
1592 bus_unregister(&iucv_bus);
1593 unregister_external_interrupt(0x4000, iucv_external_interrupt);
1594}
1595
1596subsys_initcall(iucv_init);
1597module_exit(iucv_exit);
1598
1599/**
1600 * Export all public stuff
1601 */
1602EXPORT_SYMBOL (iucv_bus);
1603EXPORT_SYMBOL (iucv_root);
1604EXPORT_SYMBOL (iucv_register);
1605EXPORT_SYMBOL (iucv_unregister);
1606EXPORT_SYMBOL (iucv_path_accept);
1607EXPORT_SYMBOL (iucv_path_connect);
1608EXPORT_SYMBOL (iucv_path_quiesce);
1609EXPORT_SYMBOL (iucv_path_sever);
1610EXPORT_SYMBOL (iucv_message_purge);
1611EXPORT_SYMBOL (iucv_message_receive);
1612EXPORT_SYMBOL (iucv_message_reject);
1613EXPORT_SYMBOL (iucv_message_reply);
1614EXPORT_SYMBOL (iucv_message_send);
1615EXPORT_SYMBOL (iucv_message_send2way);
1616
1617MODULE_AUTHOR("(C) 2001 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
1618MODULE_DESCRIPTION("Linux for S/390 IUCV lowlevel driver");
1619MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-05 17:49:56 -0500