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rapidio: add RapidIO channelized messaging driver
[deliverable/linux.git] / drivers / rapidio / rio_cm.c
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 = NULL;
1084 struct rio_channel *new_ch = NULL;
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 kfree(req);
1159
1160 down_read(&rdev_sem);
1161 /* Find requester's device object */
1162 list_for_each_entry(peer, &new_ch->cmdev->peers, node) {
1163 if (peer->rdev->destid == new_ch->rem_destid) {
1164 riocm_debug(RX_CMD, "found matching device(%s)",
1165 rio_name(peer->rdev));
1166 found = 1;
1167 break;
1168 }
1169 }
1170 up_read(&rdev_sem);
1171
1172 if (!found) {
1173 /* If peer device object not found, simply ignore the request */
1174 err = -ENODEV;
1175 goto err_nodev;
1176 }
1177
1178 new_ch->rdev = peer->rdev;
1179 new_ch->state = RIO_CM_CONNECTED;
1180 spin_lock_init(&new_ch->lock);
1181
1182 /* Acknowledge the connection request. */
1183 riocm_send_ack(new_ch);
1184
1185 *new_ch_id = new_ch->id;
1186 return new_ch;
1187 err_put:
1188 riocm_put_channel(ch);
1189 err_nodev:
1190 if (new_ch) {
1191 spin_lock_bh(&idr_lock);
1192 idr_remove(&ch_idr, new_ch->id);
1193 spin_unlock_bh(&idr_lock);
1194 riocm_put_channel(new_ch);
1195 }
1196 *new_ch_id = 0;
1197 return ERR_PTR(err);
1198 }
1199
1200 /*
1201 * riocm_ch_listen - puts a channel into LISTEN state
1202 * @ch_id: channel ID
1203 *
1204 * Returns: 0 if success, or
1205 * -EINVAL if the specified channel does not exists or
1206 * is not in CHAN_BOUND state.
1207 */
1208 static int riocm_ch_listen(u16 ch_id)
1209 {
1210 struct rio_channel *ch = NULL;
1211 int ret = 0;
1212
1213 riocm_debug(CHOP, "(ch_%d)", ch_id);
1214
1215 ch = riocm_get_channel(ch_id);
1216 if (!ch || !riocm_cmp_exch(ch, RIO_CM_CHAN_BOUND, RIO_CM_LISTEN))
1217 ret = -EINVAL;
1218 riocm_put_channel(ch);
1219 return ret;
1220 }
1221
1222 /*
1223 * riocm_ch_bind - associate a channel object and an mport device
1224 * @ch_id: channel ID
1225 * @mport_id: local mport device ID
1226 * @context: pointer to the additional caller's context
1227 *
1228 * Returns: 0 if success, or
1229 * -ENODEV if cannot find specified mport,
1230 * -EINVAL if the specified channel does not exist or
1231 * is not in IDLE state.
1232 */
1233 static int riocm_ch_bind(u16 ch_id, u8 mport_id, void *context)
1234 {
1235 struct rio_channel *ch = NULL;
1236 struct cm_dev *cm;
1237 int rc = -ENODEV;
1238
1239 riocm_debug(CHOP, "ch_%d to mport_%d", ch_id, mport_id);
1240
1241 /* Find matching cm_dev object */
1242 down_read(&rdev_sem);
1243 list_for_each_entry(cm, &cm_dev_list, list) {
1244 if ((cm->mport->id == mport_id) &&
1245 rio_mport_is_running(cm->mport)) {
1246 rc = 0;
1247 break;
1248 }
1249 }
1250
1251 if (rc)
1252 goto exit;
1253
1254 ch = riocm_get_channel(ch_id);
1255 if (!ch) {
1256 rc = -EINVAL;
1257 goto exit;
1258 }
1259
1260 spin_lock_bh(&ch->lock);
1261 if (ch->state != RIO_CM_IDLE) {
1262 spin_unlock_bh(&ch->lock);
1263 rc = -EINVAL;
1264 goto err_put;
1265 }
1266
1267 ch->cmdev = cm;
1268 ch->loc_destid = cm->mport->host_deviceid;
1269 ch->context = context;
1270 ch->state = RIO_CM_CHAN_BOUND;
1271 spin_unlock_bh(&ch->lock);
1272 err_put:
1273 riocm_put_channel(ch);
1274 exit:
1275 up_read(&rdev_sem);
1276 return rc;
1277 }
1278
1279 /*
1280 * riocm_ch_alloc - channel object allocation helper routine
1281 * @ch_num: channel ID (1 ... RIOCM_MAX_CHNUM, 0 = automatic)
1282 *
1283 * Return value: pointer to newly created channel object,
1284 * or error-valued pointer
1285 */
1286 static struct rio_channel *riocm_ch_alloc(u16 ch_num)
1287 {
1288 int id;
1289 int start, end;
1290 struct rio_channel *ch;
1291
1292 ch = kzalloc(sizeof(*ch), GFP_KERNEL);
1293 if (!ch)
1294 return ERR_PTR(-ENOMEM);
1295
1296 if (ch_num) {
1297 /* If requested, try to obtain the specified channel ID */
1298 start = ch_num;
1299 end = ch_num + 1;
1300 } else {
1301 /* Obtain channel ID from the dynamic allocation range */
1302 start = chstart;
1303 end = RIOCM_MAX_CHNUM + 1;
1304 }
1305
1306 idr_preload(GFP_KERNEL);
1307 spin_lock_bh(&idr_lock);
1308 id = idr_alloc_cyclic(&ch_idr, ch, start, end, GFP_NOWAIT);
1309 spin_unlock_bh(&idr_lock);
1310 idr_preload_end();
1311
1312 if (id < 0) {
1313 kfree(ch);
1314 return ERR_PTR(id == -ENOSPC ? -EBUSY : id);
1315 }
1316
1317 ch->id = (u16)id;
1318 ch->state = RIO_CM_IDLE;
1319 spin_lock_init(&ch->lock);
1320 INIT_LIST_HEAD(&ch->accept_queue);
1321 INIT_LIST_HEAD(&ch->ch_node);
1322 init_completion(&ch->comp);
1323 init_completion(&ch->comp_close);
1324 kref_init(&ch->ref);
1325 ch->rx_ring.head = 0;
1326 ch->rx_ring.tail = 0;
1327 ch->rx_ring.count = 0;
1328 ch->rx_ring.inuse_cnt = 0;
1329
1330 return ch;
1331 }
1332
1333 /*
1334 * riocm_ch_create - creates a new channel object and allocates ID for it
1335 * @ch_num: channel ID (1 ... RIOCM_MAX_CHNUM, 0 = automatic)
1336 *
1337 * Allocates and initializes a new channel object. If the parameter ch_num > 0
1338 * and is within the valid range, riocm_ch_create tries to allocate the
1339 * specified ID for the new channel. If ch_num = 0, channel ID will be assigned
1340 * automatically from the range (chstart ... RIOCM_MAX_CHNUM).
1341 * Module parameter 'chstart' defines start of an ID range available for dynamic
1342 * allocation. Range below 'chstart' is reserved for pre-defined ID numbers.
1343 * Available channel numbers are limited by 16-bit size of channel numbers used
1344 * in the packet header.
1345 *
1346 * Return value: PTR to rio_channel structure if successful (with channel number
1347 * updated via pointer) or error-valued pointer if error.
1348 */
1349 static struct rio_channel *riocm_ch_create(u16 *ch_num)
1350 {
1351 struct rio_channel *ch = NULL;
1352
1353 ch = riocm_ch_alloc(*ch_num);
1354
1355 if (IS_ERR(ch))
1356 riocm_debug(CHOP, "Failed to allocate channel %d (err=%ld)",
1357 *ch_num, PTR_ERR(ch));
1358 else
1359 *ch_num = ch->id;
1360
1361 return ch;
1362 }
1363
1364 /*
1365 * riocm_ch_free - channel object release routine
1366 * @ref: pointer to a channel's kref structure
1367 */
1368 static void riocm_ch_free(struct kref *ref)
1369 {
1370 struct rio_channel *ch = container_of(ref, struct rio_channel, ref);
1371 int i;
1372
1373 riocm_debug(CHOP, "(ch_%d)", ch->id);
1374
1375 if (ch->rx_ring.inuse_cnt) {
1376 for (i = 0;
1377 i < RIOCM_RX_RING_SIZE && ch->rx_ring.inuse_cnt; i++) {
1378 if (ch->rx_ring.inuse[i] != NULL) {
1379 kfree(ch->rx_ring.inuse[i]);
1380 ch->rx_ring.inuse_cnt--;
1381 }
1382 }
1383 }
1384
1385 if (ch->rx_ring.count)
1386 for (i = 0; i < RIOCM_RX_RING_SIZE && ch->rx_ring.count; i++) {
1387 if (ch->rx_ring.buf[i] != NULL) {
1388 kfree(ch->rx_ring.buf[i]);
1389 ch->rx_ring.count--;
1390 }
1391 }
1392
1393 complete(&ch->comp_close);
1394 }
1395
1396 static int riocm_send_close(struct rio_channel *ch)
1397 {
1398 struct rio_ch_chan_hdr *hdr;
1399 int ret;
1400
1401 /*
1402 * Send CH_CLOSE notification to the remote RapidIO device
1403 */
1404
1405 hdr = kzalloc(sizeof(*hdr), GFP_KERNEL);
1406 if (hdr == NULL)
1407 return -ENOMEM;
1408
1409 hdr->bhdr.src_id = htonl(ch->loc_destid);
1410 hdr->bhdr.dst_id = htonl(ch->rem_destid);
1411 hdr->bhdr.src_mbox = cmbox;
1412 hdr->bhdr.dst_mbox = cmbox;
1413 hdr->bhdr.type = RIO_CM_CHAN;
1414 hdr->ch_op = CM_CONN_CLOSE;
1415 hdr->dst_ch = htons(ch->rem_channel);
1416 hdr->src_ch = htons(ch->id);
1417
1418 /* ATTN: the function call below relies on the fact that underlying
1419 * add_outb_message() routine copies TX data into its internal transfer
1420 * buffer. Needs to be reviewed if switched to direct buffer mode.
1421 */
1422 ret = riocm_post_send(ch->cmdev, ch->rdev, hdr, sizeof(*hdr));
1423
1424 if (ret == -EBUSY && !riocm_queue_req(ch->cmdev, ch->rdev,
1425 hdr, sizeof(*hdr)))
1426 return 0;
1427 kfree(hdr);
1428
1429 if (ret)
1430 riocm_error("ch(%d) send CLOSE failed (ret=%d)", ch->id, ret);
1431
1432 return ret;
1433 }
1434
1435 /*
1436 * riocm_ch_close - closes a channel object with specified ID (by local request)
1437 * @ch: channel to be closed
1438 */
1439 static int riocm_ch_close(struct rio_channel *ch)
1440 {
1441 unsigned long tmo = msecs_to_jiffies(3000);
1442 enum rio_cm_state state;
1443 long wret;
1444 int ret = 0;
1445
1446 riocm_debug(CHOP, "ch_%d by %s(%d)",
1447 ch->id, current->comm, task_pid_nr(current));
1448
1449 state = riocm_exch(ch, RIO_CM_DESTROYING);
1450 if (state == RIO_CM_CONNECTED)
1451 riocm_send_close(ch);
1452
1453 complete_all(&ch->comp);
1454
1455 riocm_put_channel(ch);
1456 wret = wait_for_completion_interruptible_timeout(&ch->comp_close, tmo);
1457
1458 riocm_debug(WAIT, "wait on %d returns %ld", ch->id, wret);
1459
1460 if (wret == 0) {
1461 /* Timeout on wait occurred */
1462 riocm_debug(CHOP, "%s(%d) timed out waiting for ch %d",
1463 current->comm, task_pid_nr(current), ch->id);
1464 ret = -ETIMEDOUT;
1465 } else if (wret == -ERESTARTSYS) {
1466 /* Wait_for_completion was interrupted by a signal */
1467 riocm_debug(CHOP, "%s(%d) wait for ch %d was interrupted",
1468 current->comm, task_pid_nr(current), ch->id);
1469 ret = -EINTR;
1470 }
1471
1472 if (!ret) {
1473 riocm_debug(CHOP, "ch_%d resources released", ch->id);
1474 kfree(ch);
1475 } else {
1476 riocm_debug(CHOP, "failed to release ch_%d resources", ch->id);
1477 }
1478
1479 return ret;
1480 }
1481
1482 /*
1483 * riocm_cdev_open() - Open character device
1484 */
1485 static int riocm_cdev_open(struct inode *inode, struct file *filp)
1486 {
1487 riocm_debug(INIT, "by %s(%d) filp=%p ",
1488 current->comm, task_pid_nr(current), filp);
1489
1490 if (list_empty(&cm_dev_list))
1491 return -ENODEV;
1492
1493 return 0;
1494 }
1495
1496 /*
1497 * riocm_cdev_release() - Release character device
1498 */
1499 static int riocm_cdev_release(struct inode *inode, struct file *filp)
1500 {
1501 struct rio_channel *ch, *_c;
1502 unsigned int i;
1503 LIST_HEAD(list);
1504
1505 riocm_debug(EXIT, "by %s(%d) filp=%p",
1506 current->comm, task_pid_nr(current), filp);
1507
1508 /* Check if there are channels associated with this file descriptor */
1509 spin_lock_bh(&idr_lock);
1510 idr_for_each_entry(&ch_idr, ch, i) {
1511 if (ch && ch->filp == filp) {
1512 riocm_debug(EXIT, "ch_%d not released by %s(%d)",
1513 ch->id, current->comm,
1514 task_pid_nr(current));
1515 idr_remove(&ch_idr, ch->id);
1516 list_add(&ch->ch_node, &list);
1517 }
1518 }
1519 spin_unlock_bh(&idr_lock);
1520
1521 if (!list_empty(&list)) {
1522 list_for_each_entry_safe(ch, _c, &list, ch_node) {
1523 list_del(&ch->ch_node);
1524 riocm_ch_close(ch);
1525 }
1526 }
1527
1528 return 0;
1529 }
1530
1531 /*
1532 * cm_ep_get_list_size() - Reports number of endpoints in the network
1533 */
1534 static int cm_ep_get_list_size(void __user *arg)
1535 {
1536 u32 __user *p = arg;
1537 u32 mport_id;
1538 u32 count = 0;
1539 struct cm_dev *cm;
1540
1541 if (get_user(mport_id, p))
1542 return -EFAULT;
1543 if (mport_id >= RIO_MAX_MPORTS)
1544 return -EINVAL;
1545
1546 /* Find a matching cm_dev object */
1547 down_read(&rdev_sem);
1548 list_for_each_entry(cm, &cm_dev_list, list) {
1549 if (cm->mport->id == mport_id) {
1550 count = cm->npeers;
1551 up_read(&rdev_sem);
1552 if (copy_to_user(arg, &count, sizeof(u32)))
1553 return -EFAULT;
1554 return 0;
1555 }
1556 }
1557 up_read(&rdev_sem);
1558
1559 return -ENODEV;
1560 }
1561
1562 /*
1563 * cm_ep_get_list() - Returns list of attached endpoints
1564 */
1565 static int cm_ep_get_list(void __user *arg)
1566 {
1567 struct cm_dev *cm;
1568 struct cm_peer *peer;
1569 u32 info[2];
1570 void *buf;
1571 u32 nent;
1572 u32 *entry_ptr;
1573 u32 i = 0;
1574 int ret = 0;
1575
1576 if (copy_from_user(&info, arg, sizeof(info)))
1577 return -EFAULT;
1578
1579 if (info[1] >= RIO_MAX_MPORTS || info[0] > RIOCM_MAX_EP_COUNT)
1580 return -EINVAL;
1581
1582 /* Find a matching cm_dev object */
1583 down_read(&rdev_sem);
1584 list_for_each_entry(cm, &cm_dev_list, list)
1585 if (cm->mport->id == (u8)info[1])
1586 goto found;
1587
1588 up_read(&rdev_sem);
1589 return -ENODEV;
1590
1591 found:
1592 nent = min(info[0], cm->npeers);
1593 buf = kcalloc(nent + 2, sizeof(u32), GFP_KERNEL);
1594 if (!buf) {
1595 up_read(&rdev_sem);
1596 return -ENOMEM;
1597 }
1598
1599 entry_ptr = (u32 *)((uintptr_t)buf + 2*sizeof(u32));
1600
1601 list_for_each_entry(peer, &cm->peers, node) {
1602 *entry_ptr = (u32)peer->rdev->destid;
1603 entry_ptr++;
1604 if (++i == nent)
1605 break;
1606 }
1607 up_read(&rdev_sem);
1608
1609 ((u32 *)buf)[0] = i; /* report an updated number of entries */
1610 ((u32 *)buf)[1] = info[1]; /* put back an mport ID */
1611 if (copy_to_user(arg, buf, sizeof(u32) * (info[0] + 2)))
1612 ret = -EFAULT;
1613
1614 kfree(buf);
1615 return ret;
1616 }
1617
1618 /*
1619 * cm_mport_get_list() - Returns list of available local mport devices
1620 */
1621 static int cm_mport_get_list(void __user *arg)
1622 {
1623 int ret = 0;
1624 u32 entries;
1625 void *buf;
1626 struct cm_dev *cm;
1627 u32 *entry_ptr;
1628 int count = 0;
1629
1630 if (copy_from_user(&entries, arg, sizeof(entries)))
1631 return -EFAULT;
1632 if (entries == 0 || entries > RIO_MAX_MPORTS)
1633 return -EINVAL;
1634 buf = kcalloc(entries + 1, sizeof(u32), GFP_KERNEL);
1635 if (!buf)
1636 return -ENOMEM;
1637
1638 /* Scan all registered cm_dev objects */
1639 entry_ptr = (u32 *)((uintptr_t)buf + sizeof(u32));
1640 down_read(&rdev_sem);
1641 list_for_each_entry(cm, &cm_dev_list, list) {
1642 if (count++ < entries) {
1643 *entry_ptr = (cm->mport->id << 16) |
1644 cm->mport->host_deviceid;
1645 entry_ptr++;
1646 }
1647 }
1648 up_read(&rdev_sem);
1649
1650 *((u32 *)buf) = count; /* report a real number of entries */
1651 if (copy_to_user(arg, buf, sizeof(u32) * (count + 1)))
1652 ret = -EFAULT;
1653
1654 kfree(buf);
1655 return ret;
1656 }
1657
1658 /*
1659 * cm_chan_create() - Create a message exchange channel
1660 */
1661 static int cm_chan_create(struct file *filp, void __user *arg)
1662 {
1663 u16 __user *p = arg;
1664 u16 ch_num;
1665 struct rio_channel *ch;
1666
1667 if (get_user(ch_num, p))
1668 return -EFAULT;
1669
1670 riocm_debug(CHOP, "ch_%d requested by %s(%d)",
1671 ch_num, current->comm, task_pid_nr(current));
1672 ch = riocm_ch_create(&ch_num);
1673 if (IS_ERR(ch))
1674 return PTR_ERR(ch);
1675
1676 ch->filp = filp;
1677 riocm_debug(CHOP, "ch_%d created by %s(%d)",
1678 ch_num, current->comm, task_pid_nr(current));
1679 return put_user(ch_num, p);
1680 }
1681
1682 /*
1683 * cm_chan_close() - Close channel
1684 * @filp: Pointer to file object
1685 * @arg: Channel to close
1686 */
1687 static int cm_chan_close(struct file *filp, void __user *arg)
1688 {
1689 u16 __user *p = arg;
1690 u16 ch_num;
1691 struct rio_channel *ch;
1692
1693 if (get_user(ch_num, p))
1694 return -EFAULT;
1695
1696 riocm_debug(CHOP, "ch_%d by %s(%d)",
1697 ch_num, current->comm, task_pid_nr(current));
1698
1699 spin_lock_bh(&idr_lock);
1700 ch = idr_find(&ch_idr, ch_num);
1701 if (!ch) {
1702 spin_unlock_bh(&idr_lock);
1703 return 0;
1704 }
1705 if (ch->filp != filp) {
1706 spin_unlock_bh(&idr_lock);
1707 return -EINVAL;
1708 }
1709 idr_remove(&ch_idr, ch->id);
1710 spin_unlock_bh(&idr_lock);
1711
1712 return riocm_ch_close(ch);
1713 }
1714
1715 /*
1716 * cm_chan_bind() - Bind channel
1717 * @arg: Channel number
1718 */
1719 static int cm_chan_bind(void __user *arg)
1720 {
1721 struct rio_cm_channel chan;
1722
1723 if (copy_from_user(&chan, arg, sizeof(chan)))
1724 return -EFAULT;
1725 if (chan.mport_id >= RIO_MAX_MPORTS)
1726 return -EINVAL;
1727
1728 return riocm_ch_bind(chan.id, chan.mport_id, NULL);
1729 }
1730
1731 /*
1732 * cm_chan_listen() - Listen on channel
1733 * @arg: Channel number
1734 */
1735 static int cm_chan_listen(void __user *arg)
1736 {
1737 u16 __user *p = arg;
1738 u16 ch_num;
1739
1740 if (get_user(ch_num, p))
1741 return -EFAULT;
1742
1743 return riocm_ch_listen(ch_num);
1744 }
1745
1746 /*
1747 * cm_chan_accept() - Accept incoming connection
1748 * @filp: Pointer to file object
1749 * @arg: Channel number
1750 */
1751 static int cm_chan_accept(struct file *filp, void __user *arg)
1752 {
1753 struct rio_cm_accept param;
1754 long accept_to;
1755 struct rio_channel *ch;
1756
1757 if (copy_from_user(&param, arg, sizeof(param)))
1758 return -EFAULT;
1759
1760 riocm_debug(CHOP, "on ch_%d by %s(%d)",
1761 param.ch_num, current->comm, task_pid_nr(current));
1762
1763 accept_to = param.wait_to ?
1764 msecs_to_jiffies(param.wait_to) : 0;
1765
1766 ch = riocm_ch_accept(param.ch_num, &param.ch_num, accept_to);
1767 if (IS_ERR(ch))
1768 return PTR_ERR(ch);
1769 ch->filp = filp;
1770
1771 riocm_debug(CHOP, "new ch_%d for %s(%d)",
1772 ch->id, current->comm, task_pid_nr(current));
1773
1774 if (copy_to_user(arg, &param, sizeof(param)))
1775 return -EFAULT;
1776 return 0;
1777 }
1778
1779 /*
1780 * cm_chan_connect() - Connect on channel
1781 * @arg: Channel information
1782 */
1783 static int cm_chan_connect(void __user *arg)
1784 {
1785 struct rio_cm_channel chan;
1786 struct cm_dev *cm;
1787 struct cm_peer *peer;
1788 int ret = -ENODEV;
1789
1790 if (copy_from_user(&chan, arg, sizeof(chan)))
1791 return -EFAULT;
1792 if (chan.mport_id >= RIO_MAX_MPORTS)
1793 return -EINVAL;
1794
1795 down_read(&rdev_sem);
1796
1797 /* Find matching cm_dev object */
1798 list_for_each_entry(cm, &cm_dev_list, list) {
1799 if (cm->mport->id == chan.mport_id) {
1800 ret = 0;
1801 break;
1802 }
1803 }
1804
1805 if (ret)
1806 goto err_out;
1807
1808 if (chan.remote_destid >= RIO_ANY_DESTID(cm->mport->sys_size)) {
1809 ret = -EINVAL;
1810 goto err_out;
1811 }
1812
1813 /* Find corresponding RapidIO endpoint device object */
1814 ret = -ENODEV;
1815
1816 list_for_each_entry(peer, &cm->peers, node) {
1817 if (peer->rdev->destid == chan.remote_destid) {
1818 ret = 0;
1819 break;
1820 }
1821 }
1822
1823 if (ret)
1824 goto err_out;
1825
1826 up_read(&rdev_sem);
1827
1828 return riocm_ch_connect(chan.id, cm, peer, chan.remote_channel);
1829 err_out:
1830 up_read(&rdev_sem);
1831 return ret;
1832 }
1833
1834 /*
1835 * cm_chan_msg_send() - Send a message through channel
1836 * @arg: Outbound message information
1837 */
1838 static int cm_chan_msg_send(void __user *arg)
1839 {
1840 struct rio_cm_msg msg;
1841 void *buf;
1842 int ret = 0;
1843
1844 if (copy_from_user(&msg, arg, sizeof(msg)))
1845 return -EFAULT;
1846 if (msg.size > RIO_MAX_MSG_SIZE)
1847 return -EINVAL;
1848
1849 buf = kmalloc(msg.size, GFP_KERNEL);
1850 if (!buf)
1851 return -ENOMEM;
1852
1853 if (copy_from_user(buf, (void __user *)(uintptr_t)msg.msg, msg.size)) {
1854 ret = -EFAULT;
1855 goto out;
1856 }
1857
1858 ret = riocm_ch_send(msg.ch_num, buf, msg.size);
1859 out:
1860 kfree(buf);
1861 return ret;
1862 }
1863
1864 /*
1865 * cm_chan_msg_rcv() - Receive a message through channel
1866 * @arg: Inbound message information
1867 */
1868 static int cm_chan_msg_rcv(void __user *arg)
1869 {
1870 struct rio_cm_msg msg;
1871 struct rio_channel *ch;
1872 void *buf;
1873 long rxto;
1874 int ret = 0, msg_size;
1875
1876 if (copy_from_user(&msg, arg, sizeof(msg)))
1877 return -EFAULT;
1878
1879 if (msg.ch_num == 0 || msg.size == 0)
1880 return -EINVAL;
1881
1882 ch = riocm_get_channel(msg.ch_num);
1883 if (!ch)
1884 return -ENODEV;
1885
1886 rxto = msg.rxto ? msecs_to_jiffies(msg.rxto) : MAX_SCHEDULE_TIMEOUT;
1887
1888 ret = riocm_ch_receive(ch, &buf, rxto);
1889 if (ret)
1890 goto out;
1891
1892 msg_size = min(msg.size, (u16)(RIO_MAX_MSG_SIZE));
1893
1894 if (copy_to_user((void __user *)(uintptr_t)msg.msg, buf, msg_size))
1895 ret = -EFAULT;
1896
1897 riocm_ch_free_rxbuf(ch, buf);
1898 out:
1899 riocm_put_channel(ch);
1900 return ret;
1901 }
1902
1903 /*
1904 * riocm_cdev_ioctl() - IOCTL requests handler
1905 */
1906 static long
1907 riocm_cdev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1908 {
1909 switch (cmd) {
1910 case RIO_CM_EP_GET_LIST_SIZE:
1911 return cm_ep_get_list_size((void __user *)arg);
1912 case RIO_CM_EP_GET_LIST:
1913 return cm_ep_get_list((void __user *)arg);
1914 case RIO_CM_CHAN_CREATE:
1915 return cm_chan_create(filp, (void __user *)arg);
1916 case RIO_CM_CHAN_CLOSE:
1917 return cm_chan_close(filp, (void __user *)arg);
1918 case RIO_CM_CHAN_BIND:
1919 return cm_chan_bind((void __user *)arg);
1920 case RIO_CM_CHAN_LISTEN:
1921 return cm_chan_listen((void __user *)arg);
1922 case RIO_CM_CHAN_ACCEPT:
1923 return cm_chan_accept(filp, (void __user *)arg);
1924 case RIO_CM_CHAN_CONNECT:
1925 return cm_chan_connect((void __user *)arg);
1926 case RIO_CM_CHAN_SEND:
1927 return cm_chan_msg_send((void __user *)arg);
1928 case RIO_CM_CHAN_RECEIVE:
1929 return cm_chan_msg_rcv((void __user *)arg);
1930 case RIO_CM_MPORT_GET_LIST:
1931 return cm_mport_get_list((void __user *)arg);
1932 default:
1933 break;
1934 }
1935
1936 return -EINVAL;
1937 }
1938
1939 static const struct file_operations riocm_cdev_fops = {
1940 .owner = THIS_MODULE,
1941 .open = riocm_cdev_open,
1942 .release = riocm_cdev_release,
1943 .unlocked_ioctl = riocm_cdev_ioctl,
1944 };
1945
1946 /*
1947 * riocm_add_dev - add new remote RapidIO device into channel management core
1948 * @dev: device object associated with RapidIO device
1949 * @sif: subsystem interface
1950 *
1951 * Adds the specified RapidIO device (if applicable) into peers list of
1952 * the corresponding channel management device (cm_dev).
1953 */
1954 static int riocm_add_dev(struct device *dev, struct subsys_interface *sif)
1955 {
1956 struct cm_peer *peer;
1957 struct rio_dev *rdev = to_rio_dev(dev);
1958 struct cm_dev *cm;
1959
1960 /* Check if the remote device has capabilities required to support CM */
1961 if (!dev_cm_capable(rdev))
1962 return 0;
1963
1964 riocm_debug(RDEV, "(%s)", rio_name(rdev));
1965
1966 peer = kmalloc(sizeof(*peer), GFP_KERNEL);
1967 if (!peer)
1968 return -ENOMEM;
1969
1970 /* Find a corresponding cm_dev object */
1971 down_write(&rdev_sem);
1972 list_for_each_entry(cm, &cm_dev_list, list) {
1973 if (cm->mport == rdev->net->hport)
1974 goto found;
1975 }
1976
1977 up_write(&rdev_sem);
1978 kfree(peer);
1979 return -ENODEV;
1980
1981 found:
1982 peer->rdev = rdev;
1983 list_add_tail(&peer->node, &cm->peers);
1984 cm->npeers++;
1985
1986 up_write(&rdev_sem);
1987 return 0;
1988 }
1989
1990 /*
1991 * riocm_remove_dev - remove remote RapidIO device from channel management core
1992 * @dev: device object associated with RapidIO device
1993 * @sif: subsystem interface
1994 *
1995 * Removes the specified RapidIO device (if applicable) from peers list of
1996 * the corresponding channel management device (cm_dev).
1997 */
1998 static void riocm_remove_dev(struct device *dev, struct subsys_interface *sif)
1999 {
2000 struct rio_dev *rdev = to_rio_dev(dev);
2001 struct cm_dev *cm;
2002 struct cm_peer *peer;
2003 struct rio_channel *ch, *_c;
2004 unsigned int i;
2005 bool found = false;
2006 LIST_HEAD(list);
2007
2008 /* Check if the remote device has capabilities required to support CM */
2009 if (!dev_cm_capable(rdev))
2010 return;
2011
2012 riocm_debug(RDEV, "(%s)", rio_name(rdev));
2013
2014 /* Find matching cm_dev object */
2015 down_write(&rdev_sem);
2016 list_for_each_entry(cm, &cm_dev_list, list) {
2017 if (cm->mport == rdev->net->hport) {
2018 found = true;
2019 break;
2020 }
2021 }
2022
2023 if (!found) {
2024 up_write(&rdev_sem);
2025 return;
2026 }
2027
2028 /* Remove remote device from the list of peers */
2029 found = false;
2030 list_for_each_entry(peer, &cm->peers, node) {
2031 if (peer->rdev == rdev) {
2032 riocm_debug(RDEV, "removing peer %s", rio_name(rdev));
2033 found = true;
2034 list_del(&peer->node);
2035 cm->npeers--;
2036 kfree(peer);
2037 break;
2038 }
2039 }
2040
2041 up_write(&rdev_sem);
2042
2043 if (!found)
2044 return;
2045
2046 /*
2047 * Release channels associated with this peer
2048 */
2049
2050 spin_lock_bh(&idr_lock);
2051 idr_for_each_entry(&ch_idr, ch, i) {
2052 if (ch && ch->rdev == rdev) {
2053 if (atomic_read(&rdev->state) != RIO_DEVICE_SHUTDOWN)
2054 riocm_exch(ch, RIO_CM_DISCONNECT);
2055 idr_remove(&ch_idr, ch->id);
2056 list_add(&ch->ch_node, &list);
2057 }
2058 }
2059 spin_unlock_bh(&idr_lock);
2060
2061 if (!list_empty(&list)) {
2062 list_for_each_entry_safe(ch, _c, &list, ch_node) {
2063 list_del(&ch->ch_node);
2064 riocm_ch_close(ch);
2065 }
2066 }
2067 }
2068
2069 /*
2070 * riocm_cdev_add() - Create rio_cm char device
2071 * @devno: device number assigned to device (MAJ + MIN)
2072 */
2073 static int riocm_cdev_add(dev_t devno)
2074 {
2075 int ret;
2076
2077 cdev_init(&riocm_cdev.cdev, &riocm_cdev_fops);
2078 riocm_cdev.cdev.owner = THIS_MODULE;
2079 ret = cdev_add(&riocm_cdev.cdev, devno, 1);
2080 if (ret < 0) {
2081 riocm_error("Cannot register a device with error %d", ret);
2082 return ret;
2083 }
2084
2085 riocm_cdev.dev = device_create(dev_class, NULL, devno, NULL, DEV_NAME);
2086 if (IS_ERR(riocm_cdev.dev)) {
2087 cdev_del(&riocm_cdev.cdev);
2088 return PTR_ERR(riocm_cdev.dev);
2089 }
2090
2091 riocm_debug(MPORT, "Added %s cdev(%d:%d)",
2092 DEV_NAME, MAJOR(devno), MINOR(devno));
2093
2094 return 0;
2095 }
2096
2097 /*
2098 * riocm_add_mport - add new local mport device into channel management core
2099 * @dev: device object associated with mport
2100 * @class_intf: class interface
2101 *
2102 * When a new mport device is added, CM immediately reserves inbound and
2103 * outbound RapidIO mailboxes that will be used.
2104 */
2105 static int riocm_add_mport(struct device *dev,
2106 struct class_interface *class_intf)
2107 {
2108 int rc;
2109 int i;
2110 struct cm_dev *cm;
2111 struct rio_mport *mport = to_rio_mport(dev);
2112
2113 riocm_debug(MPORT, "add mport %s", mport->name);
2114
2115 cm = kzalloc(sizeof(*cm), GFP_KERNEL);
2116 if (!cm)
2117 return -ENOMEM;
2118
2119 cm->mport = mport;
2120
2121 rc = rio_request_outb_mbox(mport, cm, cmbox,
2122 RIOCM_TX_RING_SIZE, riocm_outb_msg_event);
2123 if (rc) {
2124 riocm_error("failed to allocate OBMBOX_%d on %s",
2125 cmbox, mport->name);
2126 kfree(cm);
2127 return -ENODEV;
2128 }
2129
2130 rc = rio_request_inb_mbox(mport, cm, cmbox,
2131 RIOCM_RX_RING_SIZE, riocm_inb_msg_event);
2132 if (rc) {
2133 riocm_error("failed to allocate IBMBOX_%d on %s",
2134 cmbox, mport->name);
2135 rio_release_outb_mbox(mport, cmbox);
2136 kfree(cm);
2137 return -ENODEV;
2138 }
2139
2140 /*
2141 * Allocate and register inbound messaging buffers to be ready
2142 * to receive channel and system management requests
2143 */
2144 for (i = 0; i < RIOCM_RX_RING_SIZE; i++)
2145 cm->rx_buf[i] = NULL;
2146
2147 cm->rx_slots = RIOCM_RX_RING_SIZE;
2148 mutex_init(&cm->rx_lock);
2149 riocm_rx_fill(cm, RIOCM_RX_RING_SIZE);
2150 cm->rx_wq = create_workqueue(DRV_NAME "/rxq");
2151 INIT_WORK(&cm->rx_work, rio_ibmsg_handler);
2152
2153 cm->tx_slot = 0;
2154 cm->tx_cnt = 0;
2155 cm->tx_ack_slot = 0;
2156 spin_lock_init(&cm->tx_lock);
2157
2158 INIT_LIST_HEAD(&cm->peers);
2159 cm->npeers = 0;
2160 INIT_LIST_HEAD(&cm->tx_reqs);
2161
2162 down_write(&rdev_sem);
2163 list_add_tail(&cm->list, &cm_dev_list);
2164 up_write(&rdev_sem);
2165
2166 return 0;
2167 }
2168
2169 /*
2170 * riocm_remove_mport - remove local mport device from channel management core
2171 * @dev: device object associated with mport
2172 * @class_intf: class interface
2173 *
2174 * Removes a local mport device from the list of registered devices that provide
2175 * channel management services. Returns an error if the specified mport is not
2176 * registered with the CM core.
2177 */
2178 static void riocm_remove_mport(struct device *dev,
2179 struct class_interface *class_intf)
2180 {
2181 struct rio_mport *mport = to_rio_mport(dev);
2182 struct cm_dev *cm;
2183 struct cm_peer *peer, *temp;
2184 struct rio_channel *ch, *_c;
2185 unsigned int i;
2186 bool found = false;
2187 LIST_HEAD(list);
2188
2189 riocm_debug(MPORT, "%s", mport->name);
2190
2191 /* Find a matching cm_dev object */
2192 down_write(&rdev_sem);
2193 list_for_each_entry(cm, &cm_dev_list, list) {
2194 if (cm->mport == mport) {
2195 list_del(&cm->list);
2196 found = true;
2197 break;
2198 }
2199 }
2200 up_write(&rdev_sem);
2201 if (!found)
2202 return;
2203
2204 flush_workqueue(cm->rx_wq);
2205 destroy_workqueue(cm->rx_wq);
2206
2207 /* Release channels bound to this mport */
2208 spin_lock_bh(&idr_lock);
2209 idr_for_each_entry(&ch_idr, ch, i) {
2210 if (ch->cmdev == cm) {
2211 riocm_debug(RDEV, "%s drop ch_%d",
2212 mport->name, ch->id);
2213 idr_remove(&ch_idr, ch->id);
2214 list_add(&ch->ch_node, &list);
2215 }
2216 }
2217 spin_unlock_bh(&idr_lock);
2218
2219 if (!list_empty(&list)) {
2220 list_for_each_entry_safe(ch, _c, &list, ch_node) {
2221 list_del(&ch->ch_node);
2222 riocm_ch_close(ch);
2223 }
2224 }
2225
2226 rio_release_inb_mbox(mport, cmbox);
2227 rio_release_outb_mbox(mport, cmbox);
2228
2229 /* Remove and free peer entries */
2230 if (!list_empty(&cm->peers))
2231 riocm_debug(RDEV, "ATTN: peer list not empty");
2232 list_for_each_entry_safe(peer, temp, &cm->peers, node) {
2233 riocm_debug(RDEV, "removing peer %s", rio_name(peer->rdev));
2234 list_del(&peer->node);
2235 kfree(peer);
2236 }
2237
2238 riocm_rx_free(cm);
2239 kfree(cm);
2240 riocm_debug(MPORT, "%s done", mport->name);
2241 }
2242
2243 static int rio_cm_shutdown(struct notifier_block *nb, unsigned long code,
2244 void *unused)
2245 {
2246 struct rio_channel *ch;
2247 unsigned int i;
2248
2249 riocm_debug(EXIT, ".");
2250
2251 spin_lock_bh(&idr_lock);
2252 idr_for_each_entry(&ch_idr, ch, i) {
2253 riocm_debug(EXIT, "close ch %d", ch->id);
2254 if (ch->state == RIO_CM_CONNECTED)
2255 riocm_send_close(ch);
2256 }
2257 spin_unlock_bh(&idr_lock);
2258
2259 return NOTIFY_DONE;
2260 }
2261
2262 /*
2263 * riocm_interface handles addition/removal of remote RapidIO devices
2264 */
2265 static struct subsys_interface riocm_interface = {
2266 .name = "rio_cm",
2267 .subsys = &rio_bus_type,
2268 .add_dev = riocm_add_dev,
2269 .remove_dev = riocm_remove_dev,
2270 };
2271
2272 /*
2273 * rio_mport_interface handles addition/removal local mport devices
2274 */
2275 static struct class_interface rio_mport_interface __refdata = {
2276 .class = &rio_mport_class,
2277 .add_dev = riocm_add_mport,
2278 .remove_dev = riocm_remove_mport,
2279 };
2280
2281 static struct notifier_block rio_cm_notifier = {
2282 .notifier_call = rio_cm_shutdown,
2283 };
2284
2285 static int __init riocm_init(void)
2286 {
2287 int ret;
2288
2289 /* Create device class needed by udev */
2290 dev_class = class_create(THIS_MODULE, DRV_NAME);
2291 if (IS_ERR(dev_class)) {
2292 riocm_error("Cannot create " DRV_NAME " class");
2293 return PTR_ERR(dev_class);
2294 }
2295
2296 ret = alloc_chrdev_region(&dev_number, 0, 1, DRV_NAME);
2297 if (ret) {
2298 class_destroy(dev_class);
2299 return ret;
2300 }
2301
2302 dev_major = MAJOR(dev_number);
2303 dev_minor_base = MINOR(dev_number);
2304 riocm_debug(INIT, "Registered class with %d major", dev_major);
2305
2306 /*
2307 * Register as rapidio_port class interface to get notifications about
2308 * mport additions and removals.
2309 */
2310 ret = class_interface_register(&rio_mport_interface);
2311 if (ret) {
2312 riocm_error("class_interface_register error: %d", ret);
2313 goto err_reg;
2314 }
2315
2316 /*
2317 * Register as RapidIO bus interface to get notifications about
2318 * addition/removal of remote RapidIO devices.
2319 */
2320 ret = subsys_interface_register(&riocm_interface);
2321 if (ret) {
2322 riocm_error("subsys_interface_register error: %d", ret);
2323 goto err_cl;
2324 }
2325
2326 ret = register_reboot_notifier(&rio_cm_notifier);
2327 if (ret) {
2328 riocm_error("failed to register reboot notifier (err=%d)", ret);
2329 goto err_sif;
2330 }
2331
2332 ret = riocm_cdev_add(dev_number);
2333 if (ret) {
2334 unregister_reboot_notifier(&rio_cm_notifier);
2335 ret = -ENODEV;
2336 goto err_sif;
2337 }
2338
2339 return 0;
2340 err_sif:
2341 subsys_interface_unregister(&riocm_interface);
2342 err_cl:
2343 class_interface_unregister(&rio_mport_interface);
2344 err_reg:
2345 unregister_chrdev_region(dev_number, 1);
2346 class_destroy(dev_class);
2347 return ret;
2348 }
2349
2350 static void __exit riocm_exit(void)
2351 {
2352 riocm_debug(EXIT, "enter");
2353 unregister_reboot_notifier(&rio_cm_notifier);
2354 subsys_interface_unregister(&riocm_interface);
2355 class_interface_unregister(&rio_mport_interface);
2356 idr_destroy(&ch_idr);
2357
2358 device_unregister(riocm_cdev.dev);
2359 cdev_del(&(riocm_cdev.cdev));
2360
2361 class_destroy(dev_class);
2362 unregister_chrdev_region(dev_number, 1);
2363 }
2364
2365 late_initcall(riocm_init);
2366 module_exit(riocm_exit);
Linux kernel - Deliverables
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