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CIFS: Do not set credits to 1 if the server didn't grant anything
[linux/fpc-iii.git] / drivers / rapidio / rio_cm.c
blobbad0e0ea4f3059e51b6cfaffc78c859c1be3aecb
1 /*
2 * rio_cm - RapidIO Channelized Messaging Driver
3 *
4 * Copyright 2013-2016 Integrated Device Technology, Inc.
5 * Copyright (c) 2015, Prodrive Technologies
6 * Copyright (c) 2015, RapidIO Trade Association
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 * THIS PROGRAM IS DISTRIBUTED IN THE HOPE THAT IT WILL BE USEFUL,
14 * BUT WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF
15 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. SEE THE
16 * GNU GENERAL PUBLIC LICENSE FOR MORE DETAILS.
17 */
18
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/dma-mapping.h>
22 #include <linux/delay.h>
23 #include <linux/sched.h>
24 #include <linux/rio.h>
25 #include <linux/rio_drv.h>
26 #include <linux/slab.h>
27 #include <linux/idr.h>
28 #include <linux/interrupt.h>
29 #include <linux/cdev.h>
30 #include <linux/fs.h>
31 #include <linux/poll.h>
32 #include <linux/reboot.h>
33 #include <linux/bitops.h>
34 #include <linux/printk.h>
35 #include <linux/rio_cm_cdev.h>
36
37 #define DRV_NAME "rio_cm"
38 #define DRV_VERSION "1.0.0"
39 #define DRV_AUTHOR "Alexandre Bounine <alexandre.bounine@idt.com>"
40 #define DRV_DESC "RapidIO Channelized Messaging Driver"
41 #define DEV_NAME "rio_cm"
42
43 /* Debug output filtering masks */
44 enum {
45 DBG_NONE = 0,
46 DBG_INIT = BIT(0), /* driver init */
47 DBG_EXIT = BIT(1), /* driver exit */
48 DBG_MPORT = BIT(2), /* mport add/remove */
49 DBG_RDEV = BIT(3), /* RapidIO device add/remove */
50 DBG_CHOP = BIT(4), /* channel operations */
51 DBG_WAIT = BIT(5), /* waiting for events */
52 DBG_TX = BIT(6), /* message TX */
53 DBG_TX_EVENT = BIT(7), /* message TX event */
54 DBG_RX_DATA = BIT(8), /* inbound data messages */
55 DBG_RX_CMD = BIT(9), /* inbound REQ/ACK/NACK messages */
56 DBG_ALL = ~0,
57 };
58
59 #ifdef DEBUG
60 #define riocm_debug(level, fmt, arg...) \
61 do { \
62 if (DBG_##level & dbg_level) \
63 pr_debug(DRV_NAME ": %s " fmt "\n", \
64 __func__, ##arg); \
65 } while (0)
66 #else
67 #define riocm_debug(level, fmt, arg...) \
68 no_printk(KERN_DEBUG pr_fmt(DRV_NAME fmt "\n"), ##arg)
69 #endif
70
71 #define riocm_warn(fmt, arg...) \
72 pr_warn(DRV_NAME ": %s WARNING " fmt "\n", __func__, ##arg)
73
74 #define riocm_error(fmt, arg...) \
75 pr_err(DRV_NAME ": %s ERROR " fmt "\n", __func__, ##arg)
76
77
78 static int cmbox = 1;
79 module_param(cmbox, int, S_IRUGO);
80 MODULE_PARM_DESC(cmbox, "RapidIO Mailbox number (default 1)");
81
82 static int chstart = 256;
83 module_param(chstart, int, S_IRUGO);
84 MODULE_PARM_DESC(chstart,
85 "Start channel number for dynamic allocation (default 256)");
86
87 #ifdef DEBUG
88 static u32 dbg_level = DBG_NONE;
89 module_param(dbg_level, uint, S_IWUSR | S_IRUGO);
90 MODULE_PARM_DESC(dbg_level, "Debugging output level (default 0 = none)");
91 #endif
92
93 MODULE_AUTHOR(DRV_AUTHOR);
94 MODULE_DESCRIPTION(DRV_DESC);
95 MODULE_LICENSE("GPL");
96 MODULE_VERSION(DRV_VERSION);
97
98 #define RIOCM_TX_RING_SIZE 128
99 #define RIOCM_RX_RING_SIZE 128
100 #define RIOCM_CONNECT_TO 3 /* connect response TO (in sec) */
101
102 #define RIOCM_MAX_CHNUM 0xffff /* Use full range of u16 field */
103 #define RIOCM_CHNUM_AUTO 0
104 #define RIOCM_MAX_EP_COUNT 0x10000 /* Max number of endpoints */
105
106 enum rio_cm_state {
107 RIO_CM_IDLE,
108 RIO_CM_CONNECT,
109 RIO_CM_CONNECTED,
110 RIO_CM_DISCONNECT,
111 RIO_CM_CHAN_BOUND,
112 RIO_CM_LISTEN,
113 RIO_CM_DESTROYING,
114 };
115
116 enum rio_cm_pkt_type {
117 RIO_CM_SYS = 0xaa,
118 RIO_CM_CHAN = 0x55,
119 };
120
121 enum rio_cm_chop {
122 CM_CONN_REQ,
123 CM_CONN_ACK,
124 CM_CONN_CLOSE,
125 CM_DATA_MSG,
126 };
127
128 struct rio_ch_base_bhdr {
129 u32 src_id;
130 u32 dst_id;
131 #define RIO_HDR_LETTER_MASK 0xffff0000
132 #define RIO_HDR_MBOX_MASK 0x0000ffff
133 u8 src_mbox;
134 u8 dst_mbox;
135 u8 type;
136 } __attribute__((__packed__));
137
138 struct rio_ch_chan_hdr {
139 struct rio_ch_base_bhdr bhdr;
140 u8 ch_op;
141 u16 dst_ch;
142 u16 src_ch;
143 u16 msg_len;
144 u16 rsrvd;
145 } __attribute__((__packed__));
146
147 struct tx_req {
148 struct list_head node;
149 struct rio_dev *rdev;
150 void *buffer;
151 size_t len;
152 };
153
154 struct cm_dev {
155 struct list_head list;
156 struct rio_mport *mport;
157 void *rx_buf[RIOCM_RX_RING_SIZE];
158 int rx_slots;
159 struct mutex rx_lock;
160
161 void *tx_buf[RIOCM_TX_RING_SIZE];
162 int tx_slot;
163 int tx_cnt;
164 int tx_ack_slot;
165 struct list_head tx_reqs;
166 spinlock_t tx_lock;
167
168 struct list_head peers;
169 u32 npeers;
170 struct workqueue_struct *rx_wq;
171 struct work_struct rx_work;
172 };
173
174 struct chan_rx_ring {
175 void *buf[RIOCM_RX_RING_SIZE];
176 int head;
177 int tail;
178 int count;
179
180 /* Tracking RX buffers reported to upper level */
181 void *inuse[RIOCM_RX_RING_SIZE];
182 int inuse_cnt;
183 };
184
185 struct rio_channel {
186 u16 id; /* local channel ID */
187 struct kref ref; /* channel refcount */
188 struct file *filp;
189 struct cm_dev *cmdev; /* associated CM device object */
190 struct rio_dev *rdev; /* remote RapidIO device */
191 enum rio_cm_state state;
192 int error;
193 spinlock_t lock;
194 void *context;
195 u32 loc_destid; /* local destID */
196 u32 rem_destid; /* remote destID */
197 u16 rem_channel; /* remote channel ID */
198 struct list_head accept_queue;
199 struct list_head ch_node;
200 struct completion comp;
201 struct completion comp_close;
202 struct chan_rx_ring rx_ring;
203 };
204
205 struct cm_peer {
206 struct list_head node;
207 struct rio_dev *rdev;
208 };
209
210 struct rio_cm_work {
211 struct work_struct work;
212 struct cm_dev *cm;
213 void *data;
214 };
215
216 struct conn_req {
217 struct list_head node;
218 u32 destid; /* requester destID */
219 u16 chan; /* requester channel ID */
220 struct cm_dev *cmdev;
221 };
222
223 /*
224 * A channel_dev structure represents a CM_CDEV
225 * @cdev Character device
226 * @dev Associated device object
227 */
228 struct channel_dev {
229 struct cdev cdev;
230 struct device *dev;
231 };
232
233 static struct rio_channel *riocm_ch_alloc(u16 ch_num);
234 static void riocm_ch_free(struct kref *ref);
235 static int riocm_post_send(struct cm_dev *cm, struct rio_dev *rdev,
236 void *buffer, size_t len);
237 static int riocm_ch_close(struct rio_channel *ch);
238
239 static DEFINE_SPINLOCK(idr_lock);
240 static DEFINE_IDR(ch_idr);
241
242 static LIST_HEAD(cm_dev_list);
243 static DECLARE_RWSEM(rdev_sem);
244
245 static struct class *dev_class;
246 static unsigned int dev_major;
247 static unsigned int dev_minor_base;
248 static dev_t dev_number;
249 static struct channel_dev riocm_cdev;
250
251 #define is_msg_capable(src_ops, dst_ops) \
252 ((src_ops & RIO_SRC_OPS_DATA_MSG) && \
253 (dst_ops & RIO_DST_OPS_DATA_MSG))
254 #define dev_cm_capable(dev) \
255 is_msg_capable(dev->src_ops, dev->dst_ops)
256
257 static int riocm_cmp(struct rio_channel *ch, enum rio_cm_state cmp)
258 {
259 int ret;
260
261 spin_lock_bh(&ch->lock);
262 ret = (ch->state == cmp);
263 spin_unlock_bh(&ch->lock);
264 return ret;
265 }
266
267 static int riocm_cmp_exch(struct rio_channel *ch,
268 enum rio_cm_state cmp, enum rio_cm_state exch)
269 {
270 int ret;
271
272 spin_lock_bh(&ch->lock);
273 ret = (ch->state == cmp);
274 if (ret)
275 ch->state = exch;
276 spin_unlock_bh(&ch->lock);
277 return ret;
278 }
279
280 static enum rio_cm_state riocm_exch(struct rio_channel *ch,
281 enum rio_cm_state exch)
282 {
283 enum rio_cm_state old;
284
285 spin_lock_bh(&ch->lock);
286 old = ch->state;
287 ch->state = exch;
288 spin_unlock_bh(&ch->lock);
289 return old;
290 }
291
292 static struct rio_channel *riocm_get_channel(u16 nr)
293 {
294 struct rio_channel *ch;
295
296 spin_lock_bh(&idr_lock);
297 ch = idr_find(&ch_idr, nr);
298 if (ch)
299 kref_get(&ch->ref);
300 spin_unlock_bh(&idr_lock);
301 return ch;
302 }
303
304 static void riocm_put_channel(struct rio_channel *ch)
305 {
306 kref_put(&ch->ref, riocm_ch_free);
307 }
308
309 static void *riocm_rx_get_msg(struct cm_dev *cm)
310 {
311 void *msg;
312 int i;
313
314 msg = rio_get_inb_message(cm->mport, cmbox);
315 if (msg) {
316 for (i = 0; i < RIOCM_RX_RING_SIZE; i++) {
317 if (cm->rx_buf[i] == msg) {
318 cm->rx_buf[i] = NULL;
319 cm->rx_slots++;
320 break;
321 }
322 }
323
324 if (i == RIOCM_RX_RING_SIZE)
325 riocm_warn("no record for buffer 0x%p", msg);
326 }
327
328 return msg;
329 }
330
331 /*
332 * riocm_rx_fill - fills a ring of receive buffers for given cm device
333 * @cm: cm_dev object
334 * @nent: max number of entries to fill
335 *
336 * Returns: none
337 */
338 static void riocm_rx_fill(struct cm_dev *cm, int nent)
339 {
340 int i;
341
342 if (cm->rx_slots == 0)
343 return;
344
345 for (i = 0; i < RIOCM_RX_RING_SIZE && cm->rx_slots && nent; i++) {
346 if (cm->rx_buf[i] == NULL) {
347 cm->rx_buf[i] = kmalloc(RIO_MAX_MSG_SIZE, GFP_KERNEL);
348 if (cm->rx_buf[i] == NULL)
349 break;
350 rio_add_inb_buffer(cm->mport, cmbox, cm->rx_buf[i]);
351 cm->rx_slots--;
352 nent--;
353 }
354 }
355 }
356
357 /*
358 * riocm_rx_free - frees all receive buffers associated with given cm device
359 * @cm: cm_dev object
360 *
361 * Returns: none
362 */
363 static void riocm_rx_free(struct cm_dev *cm)
364 {
365 int i;
366
367 for (i = 0; i < RIOCM_RX_RING_SIZE; i++) {
368 if (cm->rx_buf[i] != NULL) {
369 kfree(cm->rx_buf[i]);
370 cm->rx_buf[i] = NULL;
371 }
372 }
373 }
374
375 /*
376 * riocm_req_handler - connection request handler
377 * @cm: cm_dev object
378 * @req_data: pointer to the request packet
379 *
380 * Returns: 0 if success, or
381 * -EINVAL if channel is not in correct state,
382 * -ENODEV if cannot find a channel with specified ID,
383 * -ENOMEM if unable to allocate memory to store the request
384 */
385 static int riocm_req_handler(struct cm_dev *cm, void *req_data)
386 {
387 struct rio_channel *ch;
388 struct conn_req *req;
389 struct rio_ch_chan_hdr *hh = req_data;
390 u16 chnum;
391
392 chnum = ntohs(hh->dst_ch);
393
394 ch = riocm_get_channel(chnum);
395
396 if (!ch)
397 return -ENODEV;
398
399 if (ch->state != RIO_CM_LISTEN) {
400 riocm_debug(RX_CMD, "channel %d is not in listen state", chnum);
401 riocm_put_channel(ch);
402 return -EINVAL;
403 }
404
405 req = kzalloc(sizeof(*req), GFP_KERNEL);
406 if (!req) {
407 riocm_put_channel(ch);
408 return -ENOMEM;
409 }
410
411 req->destid = ntohl(hh->bhdr.src_id);
412 req->chan = ntohs(hh->src_ch);
413 req->cmdev = cm;
414
415 spin_lock_bh(&ch->lock);
416 list_add_tail(&req->node, &ch->accept_queue);
417 spin_unlock_bh(&ch->lock);
418 complete(&ch->comp);
419 riocm_put_channel(ch);
420
421 return 0;
422 }
423
424 /*
425 * riocm_resp_handler - response to connection request handler
426 * @resp_data: pointer to the response packet
427 *
428 * Returns: 0 if success, or
429 * -EINVAL if channel is not in correct state,
430 * -ENODEV if cannot find a channel with specified ID,
431 */
432 static int riocm_resp_handler(void *resp_data)
433 {
434 struct rio_channel *ch;
435 struct rio_ch_chan_hdr *hh = resp_data;
436 u16 chnum;
437
438 chnum = ntohs(hh->dst_ch);
439 ch = riocm_get_channel(chnum);
440 if (!ch)
441 return -ENODEV;
442
443 if (ch->state != RIO_CM_CONNECT) {
444 riocm_put_channel(ch);
445 return -EINVAL;
446 }
447
448 riocm_exch(ch, RIO_CM_CONNECTED);
449 ch->rem_channel = ntohs(hh->src_ch);
450 complete(&ch->comp);
451 riocm_put_channel(ch);
452
453 return 0;
454 }
455
456 /*
457 * riocm_close_handler - channel close request handler
458 * @req_data: pointer to the request packet
459 *
460 * Returns: 0 if success, or
461 * -ENODEV if cannot find a channel with specified ID,
462 * + error codes returned by riocm_ch_close.
463 */
464 static int riocm_close_handler(void *data)
465 {
466 struct rio_channel *ch;
467 struct rio_ch_chan_hdr *hh = data;
468 int ret;
469
470 riocm_debug(RX_CMD, "for ch=%d", ntohs(hh->dst_ch));
471
472 spin_lock_bh(&idr_lock);
473 ch = idr_find(&ch_idr, ntohs(hh->dst_ch));
474 if (!ch) {
475 spin_unlock_bh(&idr_lock);
476 return -ENODEV;
477 }
478 idr_remove(&ch_idr, ch->id);
479 spin_unlock_bh(&idr_lock);
480
481 riocm_exch(ch, RIO_CM_DISCONNECT);
482
483 ret = riocm_ch_close(ch);
484 if (ret)
485 riocm_debug(RX_CMD, "riocm_ch_close() returned %d", ret);
486
487 return 0;
488 }
489
490 /*
491 * rio_cm_handler - function that services request (non-data) packets
492 * @cm: cm_dev object
493 * @data: pointer to the packet
494 */
495 static void rio_cm_handler(struct cm_dev *cm, void *data)
496 {
497 struct rio_ch_chan_hdr *hdr;
498
499 if (!rio_mport_is_running(cm->mport))
500 goto out;
501
502 hdr = data;
503
504 riocm_debug(RX_CMD, "OP=%x for ch=%d from %d",
505 hdr->ch_op, ntohs(hdr->dst_ch), ntohs(hdr->src_ch));
506
507 switch (hdr->ch_op) {
508 case CM_CONN_REQ:
509 riocm_req_handler(cm, data);
510 break;
511 case CM_CONN_ACK:
512 riocm_resp_handler(data);
513 break;
514 case CM_CONN_CLOSE:
515 riocm_close_handler(data);
516 break;
517 default:
518 riocm_error("Invalid packet header");
519 break;
520 }
521 out:
522 kfree(data);
523 }
524
525 /*
526 * rio_rx_data_handler - received data packet handler
527 * @cm: cm_dev object
528 * @buf: data packet
529 *
530 * Returns: 0 if success, or
531 * -ENODEV if cannot find a channel with specified ID,
532 * -EIO if channel is not in CONNECTED state,
533 * -ENOMEM if channel RX queue is full (packet discarded)
534 */
535 static int rio_rx_data_handler(struct cm_dev *cm, void *buf)
536 {
537 struct rio_ch_chan_hdr *hdr;
538 struct rio_channel *ch;
539
540 hdr = buf;
541
542 riocm_debug(RX_DATA, "for ch=%d", ntohs(hdr->dst_ch));
543
544 ch = riocm_get_channel(ntohs(hdr->dst_ch));
545 if (!ch) {
546 /* Discard data message for non-existing channel */
547 kfree(buf);
548 return -ENODEV;
549 }
550
551 /* Place pointer to the buffer into channel's RX queue */
552 spin_lock(&ch->lock);
553
554 if (ch->state != RIO_CM_CONNECTED) {
555 /* Channel is not ready to receive data, discard a packet */
556 riocm_debug(RX_DATA, "ch=%d is in wrong state=%d",
557 ch->id, ch->state);
558 spin_unlock(&ch->lock);
559 kfree(buf);
560 riocm_put_channel(ch);
561 return -EIO;
562 }
563
564 if (ch->rx_ring.count == RIOCM_RX_RING_SIZE) {
565 /* If RX ring is full, discard a packet */
566 riocm_debug(RX_DATA, "ch=%d is full", ch->id);
567 spin_unlock(&ch->lock);
568 kfree(buf);
569 riocm_put_channel(ch);
570 return -ENOMEM;
571 }
572
573 ch->rx_ring.buf[ch->rx_ring.head] = buf;
574 ch->rx_ring.head++;
575 ch->rx_ring.count++;
576 ch->rx_ring.head %= RIOCM_RX_RING_SIZE;
577
578 complete(&ch->comp);
579
580 spin_unlock(&ch->lock);
581 riocm_put_channel(ch);
582
583 return 0;
584 }
585
586 /*
587 * rio_ibmsg_handler - inbound message packet handler
588 */
589 static void rio_ibmsg_handler(struct work_struct *work)
590 {
591 struct cm_dev *cm = container_of(work, struct cm_dev, rx_work);
592 void *data;
593 struct rio_ch_chan_hdr *hdr;
594
595 if (!rio_mport_is_running(cm->mport))
596 return;
597
598 while (1) {
599 mutex_lock(&cm->rx_lock);
600 data = riocm_rx_get_msg(cm);
601 if (data)
602 riocm_rx_fill(cm, 1);
603 mutex_unlock(&cm->rx_lock);
604
605 if (data == NULL)
606 break;
607
608 hdr = data;
609
610 if (hdr->bhdr.type != RIO_CM_CHAN) {
611 /* For now simply discard packets other than channel */
612 riocm_error("Unsupported TYPE code (0x%x). Msg dropped",
613 hdr->bhdr.type);
614 kfree(data);
615 continue;
616 }
617
618 /* Process a channel message */
619 if (hdr->ch_op == CM_DATA_MSG)
620 rio_rx_data_handler(cm, data);
621 else
622 rio_cm_handler(cm, data);
623 }
624 }
625
626 static void riocm_inb_msg_event(struct rio_mport *mport, void *dev_id,
627 int mbox, int slot)
628 {
629 struct cm_dev *cm = dev_id;
630
631 if (rio_mport_is_running(cm->mport) && !work_pending(&cm->rx_work))
632 queue_work(cm->rx_wq, &cm->rx_work);
633 }
634
635 /*
636 * rio_txcq_handler - TX completion handler
637 * @cm: cm_dev object
638 * @slot: TX queue slot
639 *
640 * TX completion handler also ensures that pending request packets are placed
641 * into transmit queue as soon as a free slot becomes available. This is done
642 * to give higher priority to request packets during high intensity data flow.
643 */
644 static void rio_txcq_handler(struct cm_dev *cm, int slot)
645 {
646 int ack_slot;
647
648 /* ATTN: Add TX completion notification if/when direct buffer
649 * transfer is implemented. At this moment only correct tracking
650 * of tx_count is important.
651 */
652 riocm_debug(TX_EVENT, "for mport_%d slot %d tx_cnt %d",
653 cm->mport->id, slot, cm->tx_cnt);
654
655 spin_lock(&cm->tx_lock);
656 ack_slot = cm->tx_ack_slot;
657
658 if (ack_slot == slot)
659 riocm_debug(TX_EVENT, "slot == ack_slot");
660
661 while (cm->tx_cnt && ((ack_slot != slot) ||
662 (cm->tx_cnt == RIOCM_TX_RING_SIZE))) {
663
664 cm->tx_buf[ack_slot] = NULL;
665 ++ack_slot;
666 ack_slot &= (RIOCM_TX_RING_SIZE - 1);
667 cm->tx_cnt--;
668 }
669
670 if (cm->tx_cnt < 0 || cm->tx_cnt > RIOCM_TX_RING_SIZE)
671 riocm_error("tx_cnt %d out of sync", cm->tx_cnt);
672
673 WARN_ON((cm->tx_cnt < 0) || (cm->tx_cnt > RIOCM_TX_RING_SIZE));
674
675 cm->tx_ack_slot = ack_slot;
676
677 /*
678 * If there are pending requests, insert them into transmit queue
679 */
680 if (!list_empty(&cm->tx_reqs) && (cm->tx_cnt < RIOCM_TX_RING_SIZE)) {
681 struct tx_req *req, *_req;
682 int rc;
683
684 list_for_each_entry_safe(req, _req, &cm->tx_reqs, node) {
685 list_del(&req->node);
686 cm->tx_buf[cm->tx_slot] = req->buffer;
687 rc = rio_add_outb_message(cm->mport, req->rdev, cmbox,
688 req->buffer, req->len);
689 kfree(req->buffer);
690 kfree(req);
691
692 ++cm->tx_cnt;
693 ++cm->tx_slot;
694 cm->tx_slot &= (RIOCM_TX_RING_SIZE - 1);
695 if (cm->tx_cnt == RIOCM_TX_RING_SIZE)
696 break;
697 }
698 }
699
700 spin_unlock(&cm->tx_lock);
701 }
702
703 static void riocm_outb_msg_event(struct rio_mport *mport, void *dev_id,
704 int mbox, int slot)
705 {
706 struct cm_dev *cm = dev_id;
707
708 if (cm && rio_mport_is_running(cm->mport))
709 rio_txcq_handler(cm, slot);
710 }
711
712 static int riocm_queue_req(struct cm_dev *cm, struct rio_dev *rdev,
713 void *buffer, size_t len)
714 {
715 unsigned long flags;
716 struct tx_req *treq;
717
718 treq = kzalloc(sizeof(*treq), GFP_KERNEL);
719 if (treq == NULL)
720 return -ENOMEM;
721
722 treq->rdev = rdev;
723 treq->buffer = buffer;
724 treq->len = len;
725
726 spin_lock_irqsave(&cm->tx_lock, flags);
727 list_add_tail(&treq->node, &cm->tx_reqs);
728 spin_unlock_irqrestore(&cm->tx_lock, flags);
729 return 0;
730 }
731
732 /*
733 * riocm_post_send - helper function that places packet into msg TX queue
734 * @cm: cm_dev object
735 * @rdev: target RapidIO device object (required by outbound msg interface)
736 * @buffer: pointer to a packet buffer to send
737 * @len: length of data to transfer
738 * @req: request priority flag
739 *
740 * Returns: 0 if success, or error code otherwise.
741 */
742 static int riocm_post_send(struct cm_dev *cm, struct rio_dev *rdev,
743 void *buffer, size_t len)
744 {
745 int rc;
746 unsigned long flags;
747
748 spin_lock_irqsave(&cm->tx_lock, flags);
749
750 if (cm->mport == NULL) {
751 rc = -ENODEV;
752 goto err_out;
753 }
754
755 if (cm->tx_cnt == RIOCM_TX_RING_SIZE) {
756 riocm_debug(TX, "Tx Queue is full");
757 rc = -EBUSY;
758 goto err_out;
759 }
760
761 cm->tx_buf[cm->tx_slot] = buffer;
762 rc = rio_add_outb_message(cm->mport, rdev, cmbox, buffer, len);
763
764 riocm_debug(TX, "Add buf@%p destid=%x tx_slot=%d tx_cnt=%d",
765 buffer, rdev->destid, cm->tx_slot, cm->tx_cnt);
766
767 ++cm->tx_cnt;
768 ++cm->tx_slot;
769 cm->tx_slot &= (RIOCM_TX_RING_SIZE - 1);
770
771 err_out:
772 spin_unlock_irqrestore(&cm->tx_lock, flags);
773 return rc;
774 }
775
776 /*
777 * riocm_ch_send - sends a data packet to a remote device
778 * @ch_id: local channel ID
779 * @buf: pointer to a data buffer to send (including CM header)
780 * @len: length of data to transfer (including CM header)
781 *
782 * ATTN: ASSUMES THAT THE HEADER SPACE IS RESERVED PART OF THE DATA PACKET
783 *
784 * Returns: 0 if success, or
785 * -EINVAL if one or more input parameters is/are not valid,
786 * -ENODEV if cannot find a channel with specified ID,
787 * -EAGAIN if a channel is not in CONNECTED state,
788 * + error codes returned by HW send routine.
789 */
790 static int riocm_ch_send(u16 ch_id, void *buf, int len)
791 {
792 struct rio_channel *ch;
793 struct rio_ch_chan_hdr *hdr;
794 int ret;
795
796 if (buf == NULL || ch_id == 0 || len == 0 || len > RIO_MAX_MSG_SIZE)
797 return -EINVAL;
798
799 ch = riocm_get_channel(ch_id);
800 if (!ch) {
801 riocm_error("%s(%d) ch_%d not found", current->comm,
802 task_pid_nr(current), ch_id);
803 return -ENODEV;
804 }
805
806 if (!riocm_cmp(ch, RIO_CM_CONNECTED)) {
807 ret = -EAGAIN;
808 goto err_out;
809 }
810
811 /*
812 * Fill buffer header section with corresponding channel data
813 */
814 hdr = buf;
815
816 hdr->bhdr.src_id = htonl(ch->loc_destid);
817 hdr->bhdr.dst_id = htonl(ch->rem_destid);
818 hdr->bhdr.src_mbox = cmbox;
819 hdr->bhdr.dst_mbox = cmbox;
820 hdr->bhdr.type = RIO_CM_CHAN;
821 hdr->ch_op = CM_DATA_MSG;
822 hdr->dst_ch = htons(ch->rem_channel);
823 hdr->src_ch = htons(ch->id);
824 hdr->msg_len = htons((u16)len);
825
826 /* ATTN: the function call below relies on the fact that underlying
827 * HW-specific add_outb_message() routine copies TX data into its own
828 * internal transfer buffer (true for all RIONET compatible mport
829 * drivers). Must be reviewed if mport driver uses the buffer directly.
830 */
831
832 ret = riocm_post_send(ch->cmdev, ch->rdev, buf, len);
833 if (ret)
834 riocm_debug(TX, "ch %d send_err=%d", ch->id, ret);
835 err_out:
836 riocm_put_channel(ch);
837 return ret;
838 }
839
840 static int riocm_ch_free_rxbuf(struct rio_channel *ch, void *buf)
841 {
842 int i, ret = -EINVAL;
843
844 spin_lock_bh(&ch->lock);
845
846 for (i = 0; i < RIOCM_RX_RING_SIZE; i++) {
847 if (ch->rx_ring.inuse[i] == buf) {
848 ch->rx_ring.inuse[i] = NULL;
849 ch->rx_ring.inuse_cnt--;
850 ret = 0;
851 break;
852 }
853 }
854
855 spin_unlock_bh(&ch->lock);
856
857 if (!ret)
858 kfree(buf);
859
860 return ret;
861 }
862
863 /*
864 * riocm_ch_receive - fetch a data packet received for the specified channel
865 * @ch: local channel ID
866 * @buf: pointer to a packet buffer
867 * @timeout: timeout to wait for incoming packet (in jiffies)
868 *
869 * Returns: 0 and valid buffer pointer if success, or NULL pointer and one of:
870 * -EAGAIN if a channel is not in CONNECTED state,
871 * -ENOMEM if in-use tracking queue is full,
872 * -ETIME if wait timeout expired,
873 * -EINTR if wait was interrupted.
874 */
875 static int riocm_ch_receive(struct rio_channel *ch, void **buf, long timeout)
876 {
877 void *rxmsg = NULL;
878 int i, ret = 0;
879 long wret;
880
881 if (!riocm_cmp(ch, RIO_CM_CONNECTED)) {
882 ret = -EAGAIN;
883 goto out;
884 }
885
886 if (ch->rx_ring.inuse_cnt == RIOCM_RX_RING_SIZE) {
887 /* If we do not have entries to track buffers given to upper
888 * layer, reject request.
889 */
890 ret = -ENOMEM;
891 goto out;
892 }
893
894 wret = wait_for_completion_interruptible_timeout(&ch->comp, timeout);
895
896 riocm_debug(WAIT, "wait on %d returned %ld", ch->id, wret);
897
898 if (!wret)
899 ret = -ETIME;
900 else if (wret == -ERESTARTSYS)
901 ret = -EINTR;
902 else
903 ret = riocm_cmp(ch, RIO_CM_CONNECTED) ? 0 : -ECONNRESET;
904
905 if (ret)
906 goto out;
907
908 spin_lock_bh(&ch->lock);
909
910 rxmsg = ch->rx_ring.buf[ch->rx_ring.tail];
911 ch->rx_ring.buf[ch->rx_ring.tail] = NULL;
912 ch->rx_ring.count--;
913 ch->rx_ring.tail++;
914 ch->rx_ring.tail %= RIOCM_RX_RING_SIZE;
915 ret = -ENOMEM;
916
917 for (i = 0; i < RIOCM_RX_RING_SIZE; i++) {
918 if (ch->rx_ring.inuse[i] == NULL) {
919 ch->rx_ring.inuse[i] = rxmsg;
920 ch->rx_ring.inuse_cnt++;
921 ret = 0;
922 break;
923 }
924 }
925
926 if (ret) {
927 /* We have no entry to store pending message: drop it */
928 kfree(rxmsg);
929 rxmsg = NULL;
930 }
931
932 spin_unlock_bh(&ch->lock);
933 out:
934 *buf = rxmsg;
935 return ret;
936 }
937
938 /*
939 * riocm_ch_connect - sends a connect request to a remote device
940 * @loc_ch: local channel ID
941 * @cm: CM device to send connect request
942 * @peer: target RapidIO device
943 * @rem_ch: remote channel ID
944 *
945 * Returns: 0 if success, or
946 * -EINVAL if the channel is not in IDLE state,
947 * -EAGAIN if no connection request available immediately,
948 * -ETIME if ACK response timeout expired,
949 * -EINTR if wait for response was interrupted.
950 */
951 static int riocm_ch_connect(u16 loc_ch, struct cm_dev *cm,
952 struct cm_peer *peer, u16 rem_ch)
953 {
954 struct rio_channel *ch = NULL;
955 struct rio_ch_chan_hdr *hdr;
956 int ret;
957 long wret;
958
959 ch = riocm_get_channel(loc_ch);
960 if (!ch)
961 return -ENODEV;
962
963 if (!riocm_cmp_exch(ch, RIO_CM_IDLE, RIO_CM_CONNECT)) {
964 ret = -EINVAL;
965 goto conn_done;
966 }
967
968 ch->cmdev = cm;
969 ch->rdev = peer->rdev;
970 ch->context = NULL;
971 ch->loc_destid = cm->mport->host_deviceid;
972 ch->rem_channel = rem_ch;
973
974 /*
975 * Send connect request to the remote RapidIO device
976 */
977
978 hdr = kzalloc(sizeof(*hdr), GFP_KERNEL);
979 if (hdr == NULL) {
980 ret = -ENOMEM;
981 goto conn_done;
982 }
983
984 hdr->bhdr.src_id = htonl(ch->loc_destid);
985 hdr->bhdr.dst_id = htonl(peer->rdev->destid);
986 hdr->bhdr.src_mbox = cmbox;
987 hdr->bhdr.dst_mbox = cmbox;
988 hdr->bhdr.type = RIO_CM_CHAN;
989 hdr->ch_op = CM_CONN_REQ;
990 hdr->dst_ch = htons(rem_ch);
991 hdr->src_ch = htons(loc_ch);
992
993 /* ATTN: the function call below relies on the fact that underlying
994 * HW-specific add_outb_message() routine copies TX data into its
995 * internal transfer buffer. Must be reviewed if mport driver uses
996 * this buffer directly.
997 */
998 ret = riocm_post_send(cm, peer->rdev, hdr, sizeof(*hdr));
999
1000 if (ret != -EBUSY) {
1001 kfree(hdr);
1002 } else {
1003 ret = riocm_queue_req(cm, peer->rdev, hdr, sizeof(*hdr));
1004 if (ret)
1005 kfree(hdr);
1006 }
1007
1008 if (ret) {
1009 riocm_cmp_exch(ch, RIO_CM_CONNECT, RIO_CM_IDLE);
1010 goto conn_done;
1011 }
1012
1013 /* Wait for connect response from the remote device */
1014 wret = wait_for_completion_interruptible_timeout(&ch->comp,
1015 RIOCM_CONNECT_TO * HZ);
1016 riocm_debug(WAIT, "wait on %d returns %ld", ch->id, wret);
1017
1018 if (!wret)
1019 ret = -ETIME;
1020 else if (wret == -ERESTARTSYS)
1021 ret = -EINTR;
1022 else
1023 ret = riocm_cmp(ch, RIO_CM_CONNECTED) ? 0 : -1;
1024
1025 conn_done:
1026 riocm_put_channel(ch);
1027 return ret;
1028 }
1029
1030 static int riocm_send_ack(struct rio_channel *ch)
1031 {
1032 struct rio_ch_chan_hdr *hdr;
1033 int ret;
1034
1035 hdr = kzalloc(sizeof(*hdr), GFP_KERNEL);
1036 if (hdr == NULL)
1037 return -ENOMEM;
1038
1039 hdr->bhdr.src_id = htonl(ch->loc_destid);
1040 hdr->bhdr.dst_id = htonl(ch->rem_destid);
1041 hdr->dst_ch = htons(ch->rem_channel);
1042 hdr->src_ch = htons(ch->id);
1043 hdr->bhdr.src_mbox = cmbox;
1044 hdr->bhdr.dst_mbox = cmbox;
1045 hdr->bhdr.type = RIO_CM_CHAN;
1046 hdr->ch_op = CM_CONN_ACK;
1047
1048 /* ATTN: the function call below relies on the fact that underlying
1049 * add_outb_message() routine copies TX data into its internal transfer
1050 * buffer. Review if switching to direct buffer version.
1051 */
1052 ret = riocm_post_send(ch->cmdev, ch->rdev, hdr, sizeof(*hdr));
1053
1054 if (ret == -EBUSY && !riocm_queue_req(ch->cmdev,
1055 ch->rdev, hdr, sizeof(*hdr)))
1056 return 0;
1057 kfree(hdr);
1058
1059 if (ret)
1060 riocm_error("send ACK to ch_%d on %s failed (ret=%d)",
1061 ch->id, rio_name(ch->rdev), ret);
1062 return ret;
1063 }
1064
1065 /*
1066 * riocm_ch_accept - accept incoming connection request
1067 * @ch_id: channel ID
1068 * @new_ch_id: local mport device
1069 * @timeout: wait timeout (if 0 non-blocking call, do not wait if connection
1070 * request is not available).
1071 *
1072 * Returns: pointer to new channel struct if success, or error-valued pointer:
1073 * -ENODEV - cannot find specified channel or mport,
1074 * -EINVAL - the channel is not in IDLE state,
1075 * -EAGAIN - no connection request available immediately (timeout=0),
1076 * -ENOMEM - unable to allocate new channel,
1077 * -ETIME - wait timeout expired,
1078 * -EINTR - wait was interrupted.
1079 */
1080 static struct rio_channel *riocm_ch_accept(u16 ch_id, u16 *new_ch_id,
1081 long timeout)
1082 {
1083 struct rio_channel *ch;
1084 struct rio_channel *new_ch;
1085 struct conn_req *req;
1086 struct cm_peer *peer;
1087 int found = 0;
1088 int err = 0;
1089 long wret;
1090
1091 ch = riocm_get_channel(ch_id);
1092 if (!ch)
1093 return ERR_PTR(-EINVAL);
1094
1095 if (!riocm_cmp(ch, RIO_CM_LISTEN)) {
1096 err = -EINVAL;
1097 goto err_put;
1098 }
1099
1100 /* Don't sleep if this is a non blocking call */
1101 if (!timeout) {
1102 if (!try_wait_for_completion(&ch->comp)) {
1103 err = -EAGAIN;
1104 goto err_put;
1105 }
1106 } else {
1107 riocm_debug(WAIT, "on %d", ch->id);
1108
1109 wret = wait_for_completion_interruptible_timeout(&ch->comp,
1110 timeout);
1111 if (!wret) {
1112 err = -ETIME;
1113 goto err_put;
1114 } else if (wret == -ERESTARTSYS) {
1115 err = -EINTR;
1116 goto err_put;
1117 }
1118 }
1119
1120 spin_lock_bh(&ch->lock);
1121
1122 if (ch->state != RIO_CM_LISTEN) {
1123 err = -ECANCELED;
1124 } else if (list_empty(&ch->accept_queue)) {
1125 riocm_debug(WAIT, "on %d accept_queue is empty on completion",
1126 ch->id);
1127 err = -EIO;
1128 }
1129
1130 spin_unlock_bh(&ch->lock);
1131
1132 if (err) {
1133 riocm_debug(WAIT, "on %d returns %d", ch->id, err);
1134 goto err_put;
1135 }
1136
1137 /* Create new channel for this connection */
1138 new_ch = riocm_ch_alloc(RIOCM_CHNUM_AUTO);
1139
1140 if (IS_ERR(new_ch)) {
1141 riocm_error("failed to get channel for new req (%ld)",
1142 PTR_ERR(new_ch));
1143 err = -ENOMEM;
1144 goto err_put;
1145 }
1146
1147 spin_lock_bh(&ch->lock);
1148
1149 req = list_first_entry(&ch->accept_queue, struct conn_req, node);
1150 list_del(&req->node);
1151 new_ch->cmdev = ch->cmdev;
1152 new_ch->loc_destid = ch->loc_destid;
1153 new_ch->rem_destid = req->destid;
1154 new_ch->rem_channel = req->chan;
1155
1156 spin_unlock_bh(&ch->lock);
1157 riocm_put_channel(ch);
1158 ch = NULL;
1159 kfree(req);
1160
1161 down_read(&rdev_sem);
1162 /* Find requester's device object */
1163 list_for_each_entry(peer, &new_ch->cmdev->peers, node) {
1164 if (peer->rdev->destid == new_ch->rem_destid) {
1165 riocm_debug(RX_CMD, "found matching device(%s)",
1166 rio_name(peer->rdev));
1167 found = 1;
1168 break;
1169 }
1170 }
1171 up_read(&rdev_sem);
1172
1173 if (!found) {
1174 /* If peer device object not found, simply ignore the request */
1175 err = -ENODEV;
1176 goto err_put_new_ch;
1177 }
1178
1179 new_ch->rdev = peer->rdev;
1180 new_ch->state = RIO_CM_CONNECTED;
1181 spin_lock_init(&new_ch->lock);
1182
1183 /* Acknowledge the connection request. */
1184 riocm_send_ack(new_ch);
1185
1186 *new_ch_id = new_ch->id;
1187 return new_ch;
1188
1189 err_put_new_ch:
1190 spin_lock_bh(&idr_lock);
1191 idr_remove(&ch_idr, new_ch->id);
1192 spin_unlock_bh(&idr_lock);
1193 riocm_put_channel(new_ch);
1194
1195 err_put:
1196 if (ch)
1197 riocm_put_channel(ch);
1198 *new_ch_id = 0;
1199 return ERR_PTR(err);
1200 }
1201
1202 /*
1203 * riocm_ch_listen - puts a channel into LISTEN state
1204 * @ch_id: channel ID
1205 *
1206 * Returns: 0 if success, or
1207 * -EINVAL if the specified channel does not exists or
1208 * is not in CHAN_BOUND state.
1209 */
1210 static int riocm_ch_listen(u16 ch_id)
1211 {
1212 struct rio_channel *ch = NULL;
1213 int ret = 0;
1214
1215 riocm_debug(CHOP, "(ch_%d)", ch_id);
1216
1217 ch = riocm_get_channel(ch_id);
1218 if (!ch || !riocm_cmp_exch(ch, RIO_CM_CHAN_BOUND, RIO_CM_LISTEN))
1219 ret = -EINVAL;
1220 riocm_put_channel(ch);
1221 return ret;
1222 }
1223
1224 /*
1225 * riocm_ch_bind - associate a channel object and an mport device
1226 * @ch_id: channel ID
1227 * @mport_id: local mport device ID
1228 * @context: pointer to the additional caller's context
1229 *
1230 * Returns: 0 if success, or
1231 * -ENODEV if cannot find specified mport,
1232 * -EINVAL if the specified channel does not exist or
1233 * is not in IDLE state.
1234 */
1235 static int riocm_ch_bind(u16 ch_id, u8 mport_id, void *context)
1236 {
1237 struct rio_channel *ch = NULL;
1238 struct cm_dev *cm;
1239 int rc = -ENODEV;
1240
1241 riocm_debug(CHOP, "ch_%d to mport_%d", ch_id, mport_id);
1242
1243 /* Find matching cm_dev object */
1244 down_read(&rdev_sem);
1245 list_for_each_entry(cm, &cm_dev_list, list) {
1246 if ((cm->mport->id == mport_id) &&
1247 rio_mport_is_running(cm->mport)) {
1248 rc = 0;
1249 break;
1250 }
1251 }
1252
1253 if (rc)
1254 goto exit;
1255
1256 ch = riocm_get_channel(ch_id);
1257 if (!ch) {
1258 rc = -EINVAL;
1259 goto exit;
1260 }
1261
1262 spin_lock_bh(&ch->lock);
1263 if (ch->state != RIO_CM_IDLE) {
1264 spin_unlock_bh(&ch->lock);
1265 rc = -EINVAL;
1266 goto err_put;
1267 }
1268
1269 ch->cmdev = cm;
1270 ch->loc_destid = cm->mport->host_deviceid;
1271 ch->context = context;
1272 ch->state = RIO_CM_CHAN_BOUND;
1273 spin_unlock_bh(&ch->lock);
1274 err_put:
1275 riocm_put_channel(ch);
1276 exit:
1277 up_read(&rdev_sem);
1278 return rc;
1279 }
1280
1281 /*
1282 * riocm_ch_alloc - channel object allocation helper routine
1283 * @ch_num: channel ID (1 ... RIOCM_MAX_CHNUM, 0 = automatic)
1284 *
1285 * Return value: pointer to newly created channel object,
1286 * or error-valued pointer
1287 */
1288 static struct rio_channel *riocm_ch_alloc(u16 ch_num)
1289 {
1290 int id;
1291 int start, end;
1292 struct rio_channel *ch;
1293
1294 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
1295 if (!ch)
1296 return ERR_PTR(-ENOMEM);
1297
1298 if (ch_num) {
1299 /* If requested, try to obtain the specified channel ID */
1300 start = ch_num;
1301 end = ch_num + 1;
1302 } else {
1303 /* Obtain channel ID from the dynamic allocation range */
1304 start = chstart;
1305 end = RIOCM_MAX_CHNUM + 1;
1306 }
1307
1308 idr_preload(GFP_KERNEL);
1309 spin_lock_bh(&idr_lock);
1310 id = idr_alloc_cyclic(&ch_idr, ch, start, end, GFP_NOWAIT);
1311 spin_unlock_bh(&idr_lock);
1312 idr_preload_end();
1313
1314 if (id < 0) {
1315 kfree(ch);
1316 return ERR_PTR(id == -ENOSPC ? -EBUSY : id);
1317 }
1318
1319 ch->id = (u16)id;
1320 ch->state = RIO_CM_IDLE;
1321 spin_lock_init(&ch->lock);
1322 INIT_LIST_HEAD(&ch->accept_queue);
1323 INIT_LIST_HEAD(&ch->ch_node);
1324 init_completion(&ch->comp);
1325 init_completion(&ch->comp_close);
1326 kref_init(&ch->ref);
1327 ch->rx_ring.head = 0;
1328 ch->rx_ring.tail = 0;
1329 ch->rx_ring.count = 0;
1330 ch->rx_ring.inuse_cnt = 0;
1331
1332 return ch;
1333 }
1334
1335 /*
1336 * riocm_ch_create - creates a new channel object and allocates ID for it
1337 * @ch_num: channel ID (1 ... RIOCM_MAX_CHNUM, 0 = automatic)
1338 *
1339 * Allocates and initializes a new channel object. If the parameter ch_num > 0
1340 * and is within the valid range, riocm_ch_create tries to allocate the
1341 * specified ID for the new channel. If ch_num = 0, channel ID will be assigned
1342 * automatically from the range (chstart ... RIOCM_MAX_CHNUM).
1343 * Module parameter 'chstart' defines start of an ID range available for dynamic
1344 * allocation. Range below 'chstart' is reserved for pre-defined ID numbers.
1345 * Available channel numbers are limited by 16-bit size of channel numbers used
1346 * in the packet header.
1347 *
1348 * Return value: PTR to rio_channel structure if successful (with channel number
1349 * updated via pointer) or error-valued pointer if error.
1350 */
1351 static struct rio_channel *riocm_ch_create(u16 *ch_num)
1352 {
1353 struct rio_channel *ch = NULL;
1354
1355 ch = riocm_ch_alloc(*ch_num);
1356
1357 if (IS_ERR(ch))
1358 riocm_debug(CHOP, "Failed to allocate channel %d (err=%ld)",
1359 *ch_num, PTR_ERR(ch));
1360 else
1361 *ch_num = ch->id;
1362
1363 return ch;
1364 }
1365
1366 /*
1367 * riocm_ch_free - channel object release routine
1368 * @ref: pointer to a channel's kref structure
1369 */
1370 static void riocm_ch_free(struct kref *ref)
1371 {
1372 struct rio_channel *ch = container_of(ref, struct rio_channel, ref);
1373 int i;
1374
1375 riocm_debug(CHOP, "(ch_%d)", ch->id);
1376
1377 if (ch->rx_ring.inuse_cnt) {
1378 for (i = 0;
1379 i < RIOCM_RX_RING_SIZE && ch->rx_ring.inuse_cnt; i++) {
1380 if (ch->rx_ring.inuse[i] != NULL) {
1381 kfree(ch->rx_ring.inuse[i]);
1382 ch->rx_ring.inuse_cnt--;
1383 }
1384 }
1385 }
1386
1387 if (ch->rx_ring.count)
1388 for (i = 0; i < RIOCM_RX_RING_SIZE && ch->rx_ring.count; i++) {
1389 if (ch->rx_ring.buf[i] != NULL) {
1390 kfree(ch->rx_ring.buf[i]);
1391 ch->rx_ring.count--;
1392 }
1393 }
1394
1395 complete(&ch->comp_close);
1396 }
1397
1398 static int riocm_send_close(struct rio_channel *ch)
1399 {
1400 struct rio_ch_chan_hdr *hdr;
1401 int ret;
1402
1403 /*
1404 * Send CH_CLOSE notification to the remote RapidIO device
1405 */
1406
1407 hdr = kzalloc(sizeof(*hdr), GFP_KERNEL);
1408 if (hdr == NULL)
1409 return -ENOMEM;
1410
1411 hdr->bhdr.src_id = htonl(ch->loc_destid);
1412 hdr->bhdr.dst_id = htonl(ch->rem_destid);
1413 hdr->bhdr.src_mbox = cmbox;
1414 hdr->bhdr.dst_mbox = cmbox;
1415 hdr->bhdr.type = RIO_CM_CHAN;
1416 hdr->ch_op = CM_CONN_CLOSE;
1417 hdr->dst_ch = htons(ch->rem_channel);
1418 hdr->src_ch = htons(ch->id);
1419
1420 /* ATTN: the function call below relies on the fact that underlying
1421 * add_outb_message() routine copies TX data into its internal transfer
1422 * buffer. Needs to be reviewed if switched to direct buffer mode.
1423 */
1424 ret = riocm_post_send(ch->cmdev, ch->rdev, hdr, sizeof(*hdr));
1425
1426 if (ret == -EBUSY && !riocm_queue_req(ch->cmdev, ch->rdev,
1427 hdr, sizeof(*hdr)))
1428 return 0;
1429 kfree(hdr);
1430
1431 if (ret)
1432 riocm_error("ch(%d) send CLOSE failed (ret=%d)", ch->id, ret);
1433
1434 return ret;
1435 }
1436
1437 /*
1438 * riocm_ch_close - closes a channel object with specified ID (by local request)
1439 * @ch: channel to be closed
1440 */
1441 static int riocm_ch_close(struct rio_channel *ch)
1442 {
1443 unsigned long tmo = msecs_to_jiffies(3000);
1444 enum rio_cm_state state;
1445 long wret;
1446 int ret = 0;
1447
1448 riocm_debug(CHOP, "ch_%d by %s(%d)",
1449 ch->id, current->comm, task_pid_nr(current));
1450
1451 state = riocm_exch(ch, RIO_CM_DESTROYING);
1452 if (state == RIO_CM_CONNECTED)
1453 riocm_send_close(ch);
1454
1455 complete_all(&ch->comp);
1456
1457 riocm_put_channel(ch);
1458 wret = wait_for_completion_interruptible_timeout(&ch->comp_close, tmo);
1459
1460 riocm_debug(WAIT, "wait on %d returns %ld", ch->id, wret);
1461
1462 if (wret == 0) {
1463 /* Timeout on wait occurred */
1464 riocm_debug(CHOP, "%s(%d) timed out waiting for ch %d",
1465 current->comm, task_pid_nr(current), ch->id);
1466 ret = -ETIMEDOUT;
1467 } else if (wret == -ERESTARTSYS) {
1468 /* Wait_for_completion was interrupted by a signal */
1469 riocm_debug(CHOP, "%s(%d) wait for ch %d was interrupted",
1470 current->comm, task_pid_nr(current), ch->id);
1471 ret = -EINTR;
1472 }
1473
1474 if (!ret) {
1475 riocm_debug(CHOP, "ch_%d resources released", ch->id);
1476 kfree(ch);
1477 } else {
1478 riocm_debug(CHOP, "failed to release ch_%d resources", ch->id);
1479 }
1480
1481 return ret;
1482 }
1483
1484 /*
1485 * riocm_cdev_open() - Open character device
1486 */
1487 static int riocm_cdev_open(struct inode *inode, struct file *filp)
1488 {
1489 riocm_debug(INIT, "by %s(%d) filp=%p ",
1490 current->comm, task_pid_nr(current), filp);
1491
1492 if (list_empty(&cm_dev_list))
1493 return -ENODEV;
1494
1495 return 0;
1496 }
1497
1498 /*
1499 * riocm_cdev_release() - Release character device
1500 */
1501 static int riocm_cdev_release(struct inode *inode, struct file *filp)
1502 {
1503 struct rio_channel *ch, *_c;
1504 unsigned int i;
1505 LIST_HEAD(list);
1506
1507 riocm_debug(EXIT, "by %s(%d) filp=%p",
1508 current->comm, task_pid_nr(current), filp);
1509
1510 /* Check if there are channels associated with this file descriptor */
1511 spin_lock_bh(&idr_lock);
1512 idr_for_each_entry(&ch_idr, ch, i) {
1513 if (ch && ch->filp == filp) {
1514 riocm_debug(EXIT, "ch_%d not released by %s(%d)",
1515 ch->id, current->comm,
1516 task_pid_nr(current));
1517 idr_remove(&ch_idr, ch->id);
1518 list_add(&ch->ch_node, &list);
1519 }
1520 }
1521 spin_unlock_bh(&idr_lock);
1522
1523 if (!list_empty(&list)) {
1524 list_for_each_entry_safe(ch, _c, &list, ch_node) {
1525 list_del(&ch->ch_node);
1526 riocm_ch_close(ch);
1527 }
1528 }
1529
1530 return 0;
1531 }
1532
1533 /*
1534 * cm_ep_get_list_size() - Reports number of endpoints in the network
1535 */
1536 static int cm_ep_get_list_size(void __user *arg)
1537 {
1538 u32 __user *p = arg;
1539 u32 mport_id;
1540 u32 count = 0;
1541 struct cm_dev *cm;
1542
1543 if (get_user(mport_id, p))
1544 return -EFAULT;
1545 if (mport_id >= RIO_MAX_MPORTS)
1546 return -EINVAL;
1547
1548 /* Find a matching cm_dev object */
1549 down_read(&rdev_sem);
1550 list_for_each_entry(cm, &cm_dev_list, list) {
1551 if (cm->mport->id == mport_id) {
1552 count = cm->npeers;
1553 up_read(&rdev_sem);
1554 if (copy_to_user(arg, &count, sizeof(u32)))
1555 return -EFAULT;
1556 return 0;
1557 }
1558 }
1559 up_read(&rdev_sem);
1560
1561 return -ENODEV;
1562 }
1563
1564 /*
1565 * cm_ep_get_list() - Returns list of attached endpoints
1566 */
1567 static int cm_ep_get_list(void __user *arg)
1568 {
1569 struct cm_dev *cm;
1570 struct cm_peer *peer;
1571 u32 info[2];
1572 void *buf;
1573 u32 nent;
1574 u32 *entry_ptr;
1575 u32 i = 0;
1576 int ret = 0;
1577
1578 if (copy_from_user(&info, arg, sizeof(info)))
1579 return -EFAULT;
1580
1581 if (info[1] >= RIO_MAX_MPORTS || info[0] > RIOCM_MAX_EP_COUNT)
1582 return -EINVAL;
1583
1584 /* Find a matching cm_dev object */
1585 down_read(&rdev_sem);
1586 list_for_each_entry(cm, &cm_dev_list, list)
1587 if (cm->mport->id == (u8)info[1])
1588 goto found;
1589
1590 up_read(&rdev_sem);
1591 return -ENODEV;
1592
1593 found:
1594 nent = min(info[0], cm->npeers);
1595 buf = kcalloc(nent + 2, sizeof(u32), GFP_KERNEL);
1596 if (!buf) {
1597 up_read(&rdev_sem);
1598 return -ENOMEM;
1599 }
1600
1601 entry_ptr = (u32 *)((uintptr_t)buf + 2*sizeof(u32));
1602
1603 list_for_each_entry(peer, &cm->peers, node) {
1604 *entry_ptr = (u32)peer->rdev->destid;
1605 entry_ptr++;
1606 if (++i == nent)
1607 break;
1608 }
1609 up_read(&rdev_sem);
1610
1611 ((u32 *)buf)[0] = i; /* report an updated number of entries */
1612 ((u32 *)buf)[1] = info[1]; /* put back an mport ID */
1613 if (copy_to_user(arg, buf, sizeof(u32) * (info[0] + 2)))
1614 ret = -EFAULT;
1615
1616 kfree(buf);
1617 return ret;
1618 }
1619
1620 /*
1621 * cm_mport_get_list() - Returns list of available local mport devices
1622 */
1623 static int cm_mport_get_list(void __user *arg)
1624 {
1625 int ret = 0;
1626 u32 entries;
1627 void *buf;
1628 struct cm_dev *cm;
1629 u32 *entry_ptr;
1630 int count = 0;
1631
1632 if (copy_from_user(&entries, arg, sizeof(entries)))
1633 return -EFAULT;
1634 if (entries == 0 || entries > RIO_MAX_MPORTS)
1635 return -EINVAL;
1636 buf = kcalloc(entries + 1, sizeof(u32), GFP_KERNEL);
1637 if (!buf)
1638 return -ENOMEM;
1639
1640 /* Scan all registered cm_dev objects */
1641 entry_ptr = (u32 *)((uintptr_t)buf + sizeof(u32));
1642 down_read(&rdev_sem);
1643 list_for_each_entry(cm, &cm_dev_list, list) {
1644 if (count++ < entries) {
1645 *entry_ptr = (cm->mport->id << 16) |
1646 cm->mport->host_deviceid;
1647 entry_ptr++;
1648 }
1649 }
1650 up_read(&rdev_sem);
1651
1652 *((u32 *)buf) = count; /* report a real number of entries */
1653 if (copy_to_user(arg, buf, sizeof(u32) * (count + 1)))
1654 ret = -EFAULT;
1655
1656 kfree(buf);
1657 return ret;
1658 }
1659
1660 /*
1661 * cm_chan_create() - Create a message exchange channel
1662 */
1663 static int cm_chan_create(struct file *filp, void __user *arg)
1664 {
1665 u16 __user *p = arg;
1666 u16 ch_num;
1667 struct rio_channel *ch;
1668
1669 if (get_user(ch_num, p))
1670 return -EFAULT;
1671
1672 riocm_debug(CHOP, "ch_%d requested by %s(%d)",
1673 ch_num, current->comm, task_pid_nr(current));
1674 ch = riocm_ch_create(&ch_num);
1675 if (IS_ERR(ch))
1676 return PTR_ERR(ch);
1677
1678 ch->filp = filp;
1679 riocm_debug(CHOP, "ch_%d created by %s(%d)",
1680 ch_num, current->comm, task_pid_nr(current));
1681 return put_user(ch_num, p);
1682 }
1683
1684 /*
1685 * cm_chan_close() - Close channel
1686 * @filp: Pointer to file object
1687 * @arg: Channel to close
1688 */
1689 static int cm_chan_close(struct file *filp, void __user *arg)
1690 {
1691 u16 __user *p = arg;
1692 u16 ch_num;
1693 struct rio_channel *ch;
1694
1695 if (get_user(ch_num, p))
1696 return -EFAULT;
1697
1698 riocm_debug(CHOP, "ch_%d by %s(%d)",
1699 ch_num, current->comm, task_pid_nr(current));
1700
1701 spin_lock_bh(&idr_lock);
1702 ch = idr_find(&ch_idr, ch_num);
1703 if (!ch) {
1704 spin_unlock_bh(&idr_lock);
1705 return 0;
1706 }
1707 if (ch->filp != filp) {
1708 spin_unlock_bh(&idr_lock);
1709 return -EINVAL;
1710 }
1711 idr_remove(&ch_idr, ch->id);
1712 spin_unlock_bh(&idr_lock);
1713
1714 return riocm_ch_close(ch);
1715 }
1716
1717 /*
1718 * cm_chan_bind() - Bind channel
1719 * @arg: Channel number
1720 */
1721 static int cm_chan_bind(void __user *arg)
1722 {
1723 struct rio_cm_channel chan;
1724
1725 if (copy_from_user(&chan, arg, sizeof(chan)))
1726 return -EFAULT;
1727 if (chan.mport_id >= RIO_MAX_MPORTS)
1728 return -EINVAL;
1729
1730 return riocm_ch_bind(chan.id, chan.mport_id, NULL);
1731 }
1732
1733 /*
1734 * cm_chan_listen() - Listen on channel
1735 * @arg: Channel number
1736 */
1737 static int cm_chan_listen(void __user *arg)
1738 {
1739 u16 __user *p = arg;
1740 u16 ch_num;
1741
1742 if (get_user(ch_num, p))
1743 return -EFAULT;
1744
1745 return riocm_ch_listen(ch_num);
1746 }
1747
1748 /*
1749 * cm_chan_accept() - Accept incoming connection
1750 * @filp: Pointer to file object
1751 * @arg: Channel number
1752 */
1753 static int cm_chan_accept(struct file *filp, void __user *arg)
1754 {
1755 struct rio_cm_accept param;
1756 long accept_to;
1757 struct rio_channel *ch;
1758
1759 if (copy_from_user(&param, arg, sizeof(param)))
1760 return -EFAULT;
1761
1762 riocm_debug(CHOP, "on ch_%d by %s(%d)",
1763 param.ch_num, current->comm, task_pid_nr(current));
1764
1765 accept_to = param.wait_to ?
1766 msecs_to_jiffies(param.wait_to) : 0;
1767
1768 ch = riocm_ch_accept(param.ch_num, &param.ch_num, accept_to);
1769 if (IS_ERR(ch))
1770 return PTR_ERR(ch);
1771 ch->filp = filp;
1772
1773 riocm_debug(CHOP, "new ch_%d for %s(%d)",
1774 ch->id, current->comm, task_pid_nr(current));
1775
1776 if (copy_to_user(arg, &param, sizeof(param)))
1777 return -EFAULT;
1778 return 0;
1779 }
1780
1781 /*
1782 * cm_chan_connect() - Connect on channel
1783 * @arg: Channel information
1784 */
1785 static int cm_chan_connect(void __user *arg)
1786 {
1787 struct rio_cm_channel chan;
1788 struct cm_dev *cm;
1789 struct cm_peer *peer;
1790 int ret = -ENODEV;
1791
1792 if (copy_from_user(&chan, arg, sizeof(chan)))
1793 return -EFAULT;
1794 if (chan.mport_id >= RIO_MAX_MPORTS)
1795 return -EINVAL;
1796
1797 down_read(&rdev_sem);
1798
1799 /* Find matching cm_dev object */
1800 list_for_each_entry(cm, &cm_dev_list, list) {
1801 if (cm->mport->id == chan.mport_id) {
1802 ret = 0;
1803 break;
1804 }
1805 }
1806
1807 if (ret)
1808 goto err_out;
1809
1810 if (chan.remote_destid >= RIO_ANY_DESTID(cm->mport->sys_size)) {
1811 ret = -EINVAL;
1812 goto err_out;
1813 }
1814
1815 /* Find corresponding RapidIO endpoint device object */
1816 ret = -ENODEV;
1817
1818 list_for_each_entry(peer, &cm->peers, node) {
1819 if (peer->rdev->destid == chan.remote_destid) {
1820 ret = 0;
1821 break;
1822 }
1823 }
1824
1825 if (ret)
1826 goto err_out;
1827
1828 up_read(&rdev_sem);
1829
1830 return riocm_ch_connect(chan.id, cm, peer, chan.remote_channel);
1831 err_out:
1832 up_read(&rdev_sem);
1833 return ret;
1834 }
1835
1836 /*
1837 * cm_chan_msg_send() - Send a message through channel
1838 * @arg: Outbound message information
1839 */
1840 static int cm_chan_msg_send(void __user *arg)
1841 {
1842 struct rio_cm_msg msg;
1843 void *buf;
1844 int ret;
1845
1846 if (copy_from_user(&msg, arg, sizeof(msg)))
1847 return -EFAULT;
1848 if (msg.size > RIO_MAX_MSG_SIZE)
1849 return -EINVAL;
1850
1851 buf = memdup_user((void __user *)(uintptr_t)msg.msg, msg.size);
1852 if (IS_ERR(buf))
1853 return PTR_ERR(buf);
1854
1855 ret = riocm_ch_send(msg.ch_num, buf, msg.size);
1856
1857 kfree(buf);
1858 return ret;
1859 }
1860
1861 /*
1862 * cm_chan_msg_rcv() - Receive a message through channel
1863 * @arg: Inbound message information
1864 */
1865 static int cm_chan_msg_rcv(void __user *arg)
1866 {
1867 struct rio_cm_msg msg;
1868 struct rio_channel *ch;
1869 void *buf;
1870 long rxto;
1871 int ret = 0, msg_size;
1872
1873 if (copy_from_user(&msg, arg, sizeof(msg)))
1874 return -EFAULT;
1875
1876 if (msg.ch_num == 0 || msg.size == 0)
1877 return -EINVAL;
1878
1879 ch = riocm_get_channel(msg.ch_num);
1880 if (!ch)
1881 return -ENODEV;
1882
1883 rxto = msg.rxto ? msecs_to_jiffies(msg.rxto) : MAX_SCHEDULE_TIMEOUT;
1884
1885 ret = riocm_ch_receive(ch, &buf, rxto);
1886 if (ret)
1887 goto out;
1888
1889 msg_size = min(msg.size, (u16)(RIO_MAX_MSG_SIZE));
1890
1891 if (copy_to_user((void __user *)(uintptr_t)msg.msg, buf, msg_size))
1892 ret = -EFAULT;
1893
1894 riocm_ch_free_rxbuf(ch, buf);
1895 out:
1896 riocm_put_channel(ch);
1897 return ret;
1898 }
1899
1900 /*
1901 * riocm_cdev_ioctl() - IOCTL requests handler
1902 */
1903 static long
1904 riocm_cdev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1905 {
1906 switch (cmd) {
1907 case RIO_CM_EP_GET_LIST_SIZE:
1908 return cm_ep_get_list_size((void __user *)arg);
1909 case RIO_CM_EP_GET_LIST:
1910 return cm_ep_get_list((void __user *)arg);
1911 case RIO_CM_CHAN_CREATE:
1912 return cm_chan_create(filp, (void __user *)arg);
1913 case RIO_CM_CHAN_CLOSE:
1914 return cm_chan_close(filp, (void __user *)arg);
1915 case RIO_CM_CHAN_BIND:
1916 return cm_chan_bind((void __user *)arg);
1917 case RIO_CM_CHAN_LISTEN:
1918 return cm_chan_listen((void __user *)arg);
1919 case RIO_CM_CHAN_ACCEPT:
1920 return cm_chan_accept(filp, (void __user *)arg);
1921 case RIO_CM_CHAN_CONNECT:
1922 return cm_chan_connect((void __user *)arg);
1923 case RIO_CM_CHAN_SEND:
1924 return cm_chan_msg_send((void __user *)arg);
1925 case RIO_CM_CHAN_RECEIVE:
1926 return cm_chan_msg_rcv((void __user *)arg);
1927 case RIO_CM_MPORT_GET_LIST:
1928 return cm_mport_get_list((void __user *)arg);
1929 default:
1930 break;
1931 }
1932
1933 return -EINVAL;
1934 }
1935
1936 static const struct file_operations riocm_cdev_fops = {
1937 .owner = THIS_MODULE,
1938 .open = riocm_cdev_open,
1939 .release = riocm_cdev_release,
1940 .unlocked_ioctl = riocm_cdev_ioctl,
1941 };
1942
1943 /*
1944 * riocm_add_dev - add new remote RapidIO device into channel management core
1945 * @dev: device object associated with RapidIO device
1946 * @sif: subsystem interface
1947 *
1948 * Adds the specified RapidIO device (if applicable) into peers list of
1949 * the corresponding channel management device (cm_dev).
1950 */
1951 static int riocm_add_dev(struct device *dev, struct subsys_interface *sif)
1952 {
1953 struct cm_peer *peer;
1954 struct rio_dev *rdev = to_rio_dev(dev);
1955 struct cm_dev *cm;
1956
1957 /* Check if the remote device has capabilities required to support CM */
1958 if (!dev_cm_capable(rdev))
1959 return 0;
1960
1961 riocm_debug(RDEV, "(%s)", rio_name(rdev));
1962
1963 peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1964 if (!peer)
1965 return -ENOMEM;
1966
1967 /* Find a corresponding cm_dev object */
1968 down_write(&rdev_sem);
1969 list_for_each_entry(cm, &cm_dev_list, list) {
1970 if (cm->mport == rdev->net->hport)
1971 goto found;
1972 }
1973
1974 up_write(&rdev_sem);
1975 kfree(peer);
1976 return -ENODEV;
1977
1978 found:
1979 peer->rdev = rdev;
1980 list_add_tail(&peer->node, &cm->peers);
1981 cm->npeers++;
1982
1983 up_write(&rdev_sem);
1984 return 0;
1985 }
1986
1987 /*
1988 * riocm_remove_dev - remove remote RapidIO device from channel management core
1989 * @dev: device object associated with RapidIO device
1990 * @sif: subsystem interface
1991 *
1992 * Removes the specified RapidIO device (if applicable) from peers list of
1993 * the corresponding channel management device (cm_dev).
1994 */
1995 static void riocm_remove_dev(struct device *dev, struct subsys_interface *sif)
1996 {
1997 struct rio_dev *rdev = to_rio_dev(dev);
1998 struct cm_dev *cm;
1999 struct cm_peer *peer;
2000 struct rio_channel *ch, *_c;
2001 unsigned int i;
2002 bool found = false;
2003 LIST_HEAD(list);
2004
2005 /* Check if the remote device has capabilities required to support CM */
2006 if (!dev_cm_capable(rdev))
2007 return;
2008
2009 riocm_debug(RDEV, "(%s)", rio_name(rdev));
2010
2011 /* Find matching cm_dev object */
2012 down_write(&rdev_sem);
2013 list_for_each_entry(cm, &cm_dev_list, list) {
2014 if (cm->mport == rdev->net->hport) {
2015 found = true;
2016 break;
2017 }
2018 }
2019
2020 if (!found) {
2021 up_write(&rdev_sem);
2022 return;
2023 }
2024
2025 /* Remove remote device from the list of peers */
2026 found = false;
2027 list_for_each_entry(peer, &cm->peers, node) {
2028 if (peer->rdev == rdev) {
2029 riocm_debug(RDEV, "removing peer %s", rio_name(rdev));
2030 found = true;
2031 list_del(&peer->node);
2032 cm->npeers--;
2033 kfree(peer);
2034 break;
2035 }
2036 }
2037
2038 up_write(&rdev_sem);
2039
2040 if (!found)
2041 return;
2042
2043 /*
2044 * Release channels associated with this peer
2045 */
2046
2047 spin_lock_bh(&idr_lock);
2048 idr_for_each_entry(&ch_idr, ch, i) {
2049 if (ch && ch->rdev == rdev) {
2050 if (atomic_read(&rdev->state) != RIO_DEVICE_SHUTDOWN)
2051 riocm_exch(ch, RIO_CM_DISCONNECT);
2052 idr_remove(&ch_idr, ch->id);
2053 list_add(&ch->ch_node, &list);
2054 }
2055 }
2056 spin_unlock_bh(&idr_lock);
2057
2058 if (!list_empty(&list)) {
2059 list_for_each_entry_safe(ch, _c, &list, ch_node) {
2060 list_del(&ch->ch_node);
2061 riocm_ch_close(ch);
2062 }
2063 }
2064 }
2065
2066 /*
2067 * riocm_cdev_add() - Create rio_cm char device
2068 * @devno: device number assigned to device (MAJ + MIN)
2069 */
2070 static int riocm_cdev_add(dev_t devno)
2071 {
2072 int ret;
2073
2074 cdev_init(&riocm_cdev.cdev, &riocm_cdev_fops);
2075 riocm_cdev.cdev.owner = THIS_MODULE;
2076 ret = cdev_add(&riocm_cdev.cdev, devno, 1);
2077 if (ret < 0) {
2078 riocm_error("Cannot register a device with error %d", ret);
2079 return ret;
2080 }
2081
2082 riocm_cdev.dev = device_create(dev_class, NULL, devno, NULL, DEV_NAME);
2083 if (IS_ERR(riocm_cdev.dev)) {
2084 cdev_del(&riocm_cdev.cdev);
2085 return PTR_ERR(riocm_cdev.dev);
2086 }
2087
2088 riocm_debug(MPORT, "Added %s cdev(%d:%d)",
2089 DEV_NAME, MAJOR(devno), MINOR(devno));
2090
2091 return 0;
2092 }
2093
2094 /*
2095 * riocm_add_mport - add new local mport device into channel management core
2096 * @dev: device object associated with mport
2097 * @class_intf: class interface
2098 *
2099 * When a new mport device is added, CM immediately reserves inbound and
2100 * outbound RapidIO mailboxes that will be used.
2101 */
2102 static int riocm_add_mport(struct device *dev,
2103 struct class_interface *class_intf)
2104 {
2105 int rc;
2106 int i;
2107 struct cm_dev *cm;
2108 struct rio_mport *mport = to_rio_mport(dev);
2109
2110 riocm_debug(MPORT, "add mport %s", mport->name);
2111
2112 cm = kzalloc(sizeof(*cm), GFP_KERNEL);
2113 if (!cm)
2114 return -ENOMEM;
2115
2116 cm->mport = mport;
2117
2118 rc = rio_request_outb_mbox(mport, cm, cmbox,
2119 RIOCM_TX_RING_SIZE, riocm_outb_msg_event);
2120 if (rc) {
2121 riocm_error("failed to allocate OBMBOX_%d on %s",
2122 cmbox, mport->name);
2123 kfree(cm);
2124 return -ENODEV;
2125 }
2126
2127 rc = rio_request_inb_mbox(mport, cm, cmbox,
2128 RIOCM_RX_RING_SIZE, riocm_inb_msg_event);
2129 if (rc) {
2130 riocm_error("failed to allocate IBMBOX_%d on %s",
2131 cmbox, mport->name);
2132 rio_release_outb_mbox(mport, cmbox);
2133 kfree(cm);
2134 return -ENODEV;
2135 }
2136
2137 /*
2138 * Allocate and register inbound messaging buffers to be ready
2139 * to receive channel and system management requests
2140 */
2141 for (i = 0; i < RIOCM_RX_RING_SIZE; i++)
2142 cm->rx_buf[i] = NULL;
2143
2144 cm->rx_slots = RIOCM_RX_RING_SIZE;
2145 mutex_init(&cm->rx_lock);
2146 riocm_rx_fill(cm, RIOCM_RX_RING_SIZE);
2147 cm->rx_wq = create_workqueue(DRV_NAME "/rxq");
2148 INIT_WORK(&cm->rx_work, rio_ibmsg_handler);
2149
2150 cm->tx_slot = 0;
2151 cm->tx_cnt = 0;
2152 cm->tx_ack_slot = 0;
2153 spin_lock_init(&cm->tx_lock);
2154
2155 INIT_LIST_HEAD(&cm->peers);
2156 cm->npeers = 0;
2157 INIT_LIST_HEAD(&cm->tx_reqs);
2158
2159 down_write(&rdev_sem);
2160 list_add_tail(&cm->list, &cm_dev_list);
2161 up_write(&rdev_sem);
2162
2163 return 0;
2164 }
2165
2166 /*
2167 * riocm_remove_mport - remove local mport device from channel management core
2168 * @dev: device object associated with mport
2169 * @class_intf: class interface
2170 *
2171 * Removes a local mport device from the list of registered devices that provide
2172 * channel management services. Returns an error if the specified mport is not
2173 * registered with the CM core.
2174 */
2175 static void riocm_remove_mport(struct device *dev,
2176 struct class_interface *class_intf)
2177 {
2178 struct rio_mport *mport = to_rio_mport(dev);
2179 struct cm_dev *cm;
2180 struct cm_peer *peer, *temp;
2181 struct rio_channel *ch, *_c;
2182 unsigned int i;
2183 bool found = false;
2184 LIST_HEAD(list);
2185
2186 riocm_debug(MPORT, "%s", mport->name);
2187
2188 /* Find a matching cm_dev object */
2189 down_write(&rdev_sem);
2190 list_for_each_entry(cm, &cm_dev_list, list) {
2191 if (cm->mport == mport) {
2192 list_del(&cm->list);
2193 found = true;
2194 break;
2195 }
2196 }
2197 up_write(&rdev_sem);
2198 if (!found)
2199 return;
2200
2201 flush_workqueue(cm->rx_wq);
2202 destroy_workqueue(cm->rx_wq);
2203
2204 /* Release channels bound to this mport */
2205 spin_lock_bh(&idr_lock);
2206 idr_for_each_entry(&ch_idr, ch, i) {
2207 if (ch->cmdev == cm) {
2208 riocm_debug(RDEV, "%s drop ch_%d",
2209 mport->name, ch->id);
2210 idr_remove(&ch_idr, ch->id);
2211 list_add(&ch->ch_node, &list);
2212 }
2213 }
2214 spin_unlock_bh(&idr_lock);
2215
2216 if (!list_empty(&list)) {
2217 list_for_each_entry_safe(ch, _c, &list, ch_node) {
2218 list_del(&ch->ch_node);
2219 riocm_ch_close(ch);
2220 }
2221 }
2222
2223 rio_release_inb_mbox(mport, cmbox);
2224 rio_release_outb_mbox(mport, cmbox);
2225
2226 /* Remove and free peer entries */
2227 if (!list_empty(&cm->peers))
2228 riocm_debug(RDEV, "ATTN: peer list not empty");
2229 list_for_each_entry_safe(peer, temp, &cm->peers, node) {
2230 riocm_debug(RDEV, "removing peer %s", rio_name(peer->rdev));
2231 list_del(&peer->node);
2232 kfree(peer);
2233 }
2234
2235 riocm_rx_free(cm);
2236 kfree(cm);
2237 riocm_debug(MPORT, "%s done", mport->name);
2238 }
2239
2240 static int rio_cm_shutdown(struct notifier_block *nb, unsigned long code,
2241 void *unused)
2242 {
2243 struct rio_channel *ch;
2244 unsigned int i;
2245 LIST_HEAD(list);
2246
2247 riocm_debug(EXIT, ".");
2248
2249 /*
2250 * If there are any channels left in connected state send
2251 * close notification to the connection partner.
2252 * First build a list of channels that require a closing
2253 * notification because function riocm_send_close() should
2254 * be called outside of spinlock protected code.
2255 */
2256 spin_lock_bh(&idr_lock);
2257 idr_for_each_entry(&ch_idr, ch, i) {
2258 if (ch->state == RIO_CM_CONNECTED) {
2259 riocm_debug(EXIT, "close ch %d", ch->id);
2260 idr_remove(&ch_idr, ch->id);
2261 list_add(&ch->ch_node, &list);
2262 }
2263 }
2264 spin_unlock_bh(&idr_lock);
2265
2266 list_for_each_entry(ch, &list, ch_node)
2267 riocm_send_close(ch);
2268
2269 return NOTIFY_DONE;
2270 }
2271
2272 /*
2273 * riocm_interface handles addition/removal of remote RapidIO devices
2274 */
2275 static struct subsys_interface riocm_interface = {
2276 .name = "rio_cm",
2277 .subsys = &rio_bus_type,
2278 .add_dev = riocm_add_dev,
2279 .remove_dev = riocm_remove_dev,
2280 };
2281
2282 /*
2283 * rio_mport_interface handles addition/removal local mport devices
2284 */
2285 static struct class_interface rio_mport_interface __refdata = {
2286 .class = &rio_mport_class,
2287 .add_dev = riocm_add_mport,
2288 .remove_dev = riocm_remove_mport,
2289 };
2290
2291 static struct notifier_block rio_cm_notifier = {
2292 .notifier_call = rio_cm_shutdown,
2293 };
2294
2295 static int __init riocm_init(void)
2296 {
2297 int ret;
2298
2299 /* Create device class needed by udev */
2300 dev_class = class_create(THIS_MODULE, DRV_NAME);
2301 if (IS_ERR(dev_class)) {
2302 riocm_error("Cannot create " DRV_NAME " class");
2303 return PTR_ERR(dev_class);
2304 }
2305
2306 ret = alloc_chrdev_region(&dev_number, 0, 1, DRV_NAME);
2307 if (ret) {
2308 class_destroy(dev_class);
2309 return ret;
2310 }
2311
2312 dev_major = MAJOR(dev_number);
2313 dev_minor_base = MINOR(dev_number);
2314 riocm_debug(INIT, "Registered class with %d major", dev_major);
2315
2316 /*
2317 * Register as rapidio_port class interface to get notifications about
2318 * mport additions and removals.
2319 */
2320 ret = class_interface_register(&rio_mport_interface);
2321 if (ret) {
2322 riocm_error("class_interface_register error: %d", ret);
2323 goto err_reg;
2324 }
2325
2326 /*
2327 * Register as RapidIO bus interface to get notifications about
2328 * addition/removal of remote RapidIO devices.
2329 */
2330 ret = subsys_interface_register(&riocm_interface);
2331 if (ret) {
2332 riocm_error("subsys_interface_register error: %d", ret);
2333 goto err_cl;
2334 }
2335
2336 ret = register_reboot_notifier(&rio_cm_notifier);
2337 if (ret) {
2338 riocm_error("failed to register reboot notifier (err=%d)", ret);
2339 goto err_sif;
2340 }
2341
2342 ret = riocm_cdev_add(dev_number);
2343 if (ret) {
2344 unregister_reboot_notifier(&rio_cm_notifier);
2345 ret = -ENODEV;
2346 goto err_sif;
2347 }
2348
2349 return 0;
2350 err_sif:
2351 subsys_interface_unregister(&riocm_interface);
2352 err_cl:
2353 class_interface_unregister(&rio_mport_interface);
2354 err_reg:
2355 unregister_chrdev_region(dev_number, 1);
2356 class_destroy(dev_class);
2357 return ret;
2358 }
2359
2360 static void __exit riocm_exit(void)
2361 {
2362 riocm_debug(EXIT, "enter");
2363 unregister_reboot_notifier(&rio_cm_notifier);
2364 subsys_interface_unregister(&riocm_interface);
2365 class_interface_unregister(&rio_mport_interface);
2366 idr_destroy(&ch_idr);
2367
2368 device_unregister(riocm_cdev.dev);
2369 cdev_del(&(riocm_cdev.cdev));
2370
2371 class_destroy(dev_class);
2372 unregister_chrdev_region(dev_number, 1);
2373 }
2374
2375 late_initcall(riocm_init);
2376 module_exit(riocm_exit);
Linux with added FPC-III support