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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
b6e8d4aa AB |
2 | /* |
3 | * rio_cm - RapidIO Channelized Messaging Driver | |
4 | * | |
5 | * Copyright 2013-2016 Integrated Device Technology, Inc. | |
6 | * Copyright (c) 2015, Prodrive Technologies | |
7 | * Copyright (c) 2015, RapidIO Trade Association | |
b6e8d4aa AB |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/dma-mapping.h> | |
13 | #include <linux/delay.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/rio.h> | |
16 | #include <linux/rio_drv.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/idr.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/cdev.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/poll.h> | |
23 | #include <linux/reboot.h> | |
24 | #include <linux/bitops.h> | |
25 | #include <linux/printk.h> | |
26 | #include <linux/rio_cm_cdev.h> | |
27 | ||
28 | #define DRV_NAME "rio_cm" | |
29 | #define DRV_VERSION "1.0.0" | |
30 | #define DRV_AUTHOR "Alexandre Bounine <alexandre.bounine@idt.com>" | |
31 | #define DRV_DESC "RapidIO Channelized Messaging Driver" | |
32 | #define DEV_NAME "rio_cm" | |
33 | ||
34 | /* Debug output filtering masks */ | |
35 | enum { | |
36 | DBG_NONE = 0, | |
37 | DBG_INIT = BIT(0), /* driver init */ | |
38 | DBG_EXIT = BIT(1), /* driver exit */ | |
39 | DBG_MPORT = BIT(2), /* mport add/remove */ | |
40 | DBG_RDEV = BIT(3), /* RapidIO device add/remove */ | |
41 | DBG_CHOP = BIT(4), /* channel operations */ | |
42 | DBG_WAIT = BIT(5), /* waiting for events */ | |
43 | DBG_TX = BIT(6), /* message TX */ | |
44 | DBG_TX_EVENT = BIT(7), /* message TX event */ | |
45 | DBG_RX_DATA = BIT(8), /* inbound data messages */ | |
46 | DBG_RX_CMD = BIT(9), /* inbound REQ/ACK/NACK messages */ | |
47 | DBG_ALL = ~0, | |
48 | }; | |
49 | ||
50 | #ifdef DEBUG | |
51 | #define riocm_debug(level, fmt, arg...) \ | |
52 | do { \ | |
53 | if (DBG_##level & dbg_level) \ | |
54 | pr_debug(DRV_NAME ": %s " fmt "\n", \ | |
55 | __func__, ##arg); \ | |
56 | } while (0) | |
57 | #else | |
58 | #define riocm_debug(level, fmt, arg...) \ | |
59 | no_printk(KERN_DEBUG pr_fmt(DRV_NAME fmt "\n"), ##arg) | |
60 | #endif | |
61 | ||
62 | #define riocm_warn(fmt, arg...) \ | |
63 | pr_warn(DRV_NAME ": %s WARNING " fmt "\n", __func__, ##arg) | |
64 | ||
65 | #define riocm_error(fmt, arg...) \ | |
66 | pr_err(DRV_NAME ": %s ERROR " fmt "\n", __func__, ##arg) | |
67 | ||
68 | ||
69 | static int cmbox = 1; | |
70 | module_param(cmbox, int, S_IRUGO); | |
71 | MODULE_PARM_DESC(cmbox, "RapidIO Mailbox number (default 1)"); | |
72 | ||
73 | static int chstart = 256; | |
74 | module_param(chstart, int, S_IRUGO); | |
75 | MODULE_PARM_DESC(chstart, | |
76 | "Start channel number for dynamic allocation (default 256)"); | |
77 | ||
78 | #ifdef DEBUG | |
79 | static u32 dbg_level = DBG_NONE; | |
80 | module_param(dbg_level, uint, S_IWUSR | S_IRUGO); | |
81 | MODULE_PARM_DESC(dbg_level, "Debugging output level (default 0 = none)"); | |
82 | #endif | |
83 | ||
84 | MODULE_AUTHOR(DRV_AUTHOR); | |
85 | MODULE_DESCRIPTION(DRV_DESC); | |
86 | MODULE_LICENSE("GPL"); | |
87 | MODULE_VERSION(DRV_VERSION); | |
88 | ||
89 | #define RIOCM_TX_RING_SIZE 128 | |
90 | #define RIOCM_RX_RING_SIZE 128 | |
91 | #define RIOCM_CONNECT_TO 3 /* connect response TO (in sec) */ | |
92 | ||
93 | #define RIOCM_MAX_CHNUM 0xffff /* Use full range of u16 field */ | |
94 | #define RIOCM_CHNUM_AUTO 0 | |
95 | #define RIOCM_MAX_EP_COUNT 0x10000 /* Max number of endpoints */ | |
96 | ||
97 | enum rio_cm_state { | |
98 | RIO_CM_IDLE, | |
99 | RIO_CM_CONNECT, | |
100 | RIO_CM_CONNECTED, | |
101 | RIO_CM_DISCONNECT, | |
102 | RIO_CM_CHAN_BOUND, | |
103 | RIO_CM_LISTEN, | |
104 | RIO_CM_DESTROYING, | |
105 | }; | |
106 | ||
107 | enum rio_cm_pkt_type { | |
108 | RIO_CM_SYS = 0xaa, | |
109 | RIO_CM_CHAN = 0x55, | |
110 | }; | |
111 | ||
112 | enum rio_cm_chop { | |
113 | CM_CONN_REQ, | |
114 | CM_CONN_ACK, | |
115 | CM_CONN_CLOSE, | |
116 | CM_DATA_MSG, | |
117 | }; | |
118 | ||
119 | struct rio_ch_base_bhdr { | |
120 | u32 src_id; | |
121 | u32 dst_id; | |
122 | #define RIO_HDR_LETTER_MASK 0xffff0000 | |
123 | #define RIO_HDR_MBOX_MASK 0x0000ffff | |
124 | u8 src_mbox; | |
125 | u8 dst_mbox; | |
126 | u8 type; | |
127 | } __attribute__((__packed__)); | |
128 | ||
129 | struct rio_ch_chan_hdr { | |
130 | struct rio_ch_base_bhdr bhdr; | |
131 | u8 ch_op; | |
132 | u16 dst_ch; | |
133 | u16 src_ch; | |
134 | u16 msg_len; | |
135 | u16 rsrvd; | |
136 | } __attribute__((__packed__)); | |
137 | ||
138 | struct tx_req { | |
139 | struct list_head node; | |
140 | struct rio_dev *rdev; | |
141 | void *buffer; | |
142 | size_t len; | |
143 | }; | |
144 | ||
145 | struct cm_dev { | |
146 | struct list_head list; | |
147 | struct rio_mport *mport; | |
148 | void *rx_buf[RIOCM_RX_RING_SIZE]; | |
149 | int rx_slots; | |
150 | struct mutex rx_lock; | |
151 | ||
152 | void *tx_buf[RIOCM_TX_RING_SIZE]; | |
153 | int tx_slot; | |
154 | int tx_cnt; | |
155 | int tx_ack_slot; | |
156 | struct list_head tx_reqs; | |
157 | spinlock_t tx_lock; | |
158 | ||
159 | struct list_head peers; | |
160 | u32 npeers; | |
161 | struct workqueue_struct *rx_wq; | |
162 | struct work_struct rx_work; | |
163 | }; | |
164 | ||
165 | struct chan_rx_ring { | |
166 | void *buf[RIOCM_RX_RING_SIZE]; | |
167 | int head; | |
168 | int tail; | |
169 | int count; | |
170 | ||
171 | /* Tracking RX buffers reported to upper level */ | |
172 | void *inuse[RIOCM_RX_RING_SIZE]; | |
173 | int inuse_cnt; | |
174 | }; | |
175 | ||
176 | struct rio_channel { | |
177 | u16 id; /* local channel ID */ | |
178 | struct kref ref; /* channel refcount */ | |
179 | struct file *filp; | |
180 | struct cm_dev *cmdev; /* associated CM device object */ | |
181 | struct rio_dev *rdev; /* remote RapidIO device */ | |
182 | enum rio_cm_state state; | |
183 | int error; | |
184 | spinlock_t lock; | |
185 | void *context; | |
186 | u32 loc_destid; /* local destID */ | |
187 | u32 rem_destid; /* remote destID */ | |
188 | u16 rem_channel; /* remote channel ID */ | |
189 | struct list_head accept_queue; | |
190 | struct list_head ch_node; | |
191 | struct completion comp; | |
192 | struct completion comp_close; | |
193 | struct chan_rx_ring rx_ring; | |
194 | }; | |
195 | ||
196 | struct cm_peer { | |
197 | struct list_head node; | |
198 | struct rio_dev *rdev; | |
199 | }; | |
200 | ||
201 | struct rio_cm_work { | |
202 | struct work_struct work; | |
203 | struct cm_dev *cm; | |
204 | void *data; | |
205 | }; | |
206 | ||
207 | struct conn_req { | |
208 | struct list_head node; | |
209 | u32 destid; /* requester destID */ | |
210 | u16 chan; /* requester channel ID */ | |
211 | struct cm_dev *cmdev; | |
212 | }; | |
213 | ||
214 | /* | |
215 | * A channel_dev structure represents a CM_CDEV | |
216 | * @cdev Character device | |
217 | * @dev Associated device object | |
218 | */ | |
219 | struct channel_dev { | |
220 | struct cdev cdev; | |
221 | struct device *dev; | |
222 | }; | |
223 | ||
224 | static struct rio_channel *riocm_ch_alloc(u16 ch_num); | |
225 | static void riocm_ch_free(struct kref *ref); | |
226 | static int riocm_post_send(struct cm_dev *cm, struct rio_dev *rdev, | |
227 | void *buffer, size_t len); | |
228 | static int riocm_ch_close(struct rio_channel *ch); | |
229 | ||
230 | static DEFINE_SPINLOCK(idr_lock); | |
231 | static DEFINE_IDR(ch_idr); | |
232 | ||
233 | static LIST_HEAD(cm_dev_list); | |
234 | static DECLARE_RWSEM(rdev_sem); | |
235 | ||
236 | static struct class *dev_class; | |
237 | static unsigned int dev_major; | |
238 | static unsigned int dev_minor_base; | |
239 | static dev_t dev_number; | |
240 | static struct channel_dev riocm_cdev; | |
241 | ||
242 | #define is_msg_capable(src_ops, dst_ops) \ | |
243 | ((src_ops & RIO_SRC_OPS_DATA_MSG) && \ | |
244 | (dst_ops & RIO_DST_OPS_DATA_MSG)) | |
245 | #define dev_cm_capable(dev) \ | |
246 | is_msg_capable(dev->src_ops, dev->dst_ops) | |
247 | ||
248 | static int riocm_cmp(struct rio_channel *ch, enum rio_cm_state cmp) | |
249 | { | |
250 | int ret; | |
251 | ||
252 | spin_lock_bh(&ch->lock); | |
253 | ret = (ch->state == cmp); | |
254 | spin_unlock_bh(&ch->lock); | |
255 | return ret; | |
256 | } | |
257 | ||
258 | static int riocm_cmp_exch(struct rio_channel *ch, | |
259 | enum rio_cm_state cmp, enum rio_cm_state exch) | |
260 | { | |
261 | int ret; | |
262 | ||
263 | spin_lock_bh(&ch->lock); | |
264 | ret = (ch->state == cmp); | |
265 | if (ret) | |
266 | ch->state = exch; | |
267 | spin_unlock_bh(&ch->lock); | |
268 | return ret; | |
269 | } | |
270 | ||
271 | static enum rio_cm_state riocm_exch(struct rio_channel *ch, | |
272 | enum rio_cm_state exch) | |
273 | { | |
274 | enum rio_cm_state old; | |
275 | ||
276 | spin_lock_bh(&ch->lock); | |
277 | old = ch->state; | |
278 | ch->state = exch; | |
279 | spin_unlock_bh(&ch->lock); | |
280 | return old; | |
281 | } | |
282 | ||
283 | static struct rio_channel *riocm_get_channel(u16 nr) | |
284 | { | |
285 | struct rio_channel *ch; | |
286 | ||
287 | spin_lock_bh(&idr_lock); | |
288 | ch = idr_find(&ch_idr, nr); | |
289 | if (ch) | |
290 | kref_get(&ch->ref); | |
291 | spin_unlock_bh(&idr_lock); | |
292 | return ch; | |
293 | } | |
294 | ||
295 | static void riocm_put_channel(struct rio_channel *ch) | |
296 | { | |
297 | kref_put(&ch->ref, riocm_ch_free); | |
298 | } | |
299 | ||
300 | static void *riocm_rx_get_msg(struct cm_dev *cm) | |
301 | { | |
302 | void *msg; | |
303 | int i; | |
304 | ||
305 | msg = rio_get_inb_message(cm->mport, cmbox); | |
306 | if (msg) { | |
307 | for (i = 0; i < RIOCM_RX_RING_SIZE; i++) { | |
308 | if (cm->rx_buf[i] == msg) { | |
309 | cm->rx_buf[i] = NULL; | |
310 | cm->rx_slots++; | |
311 | break; | |
312 | } | |
313 | } | |
314 | ||
315 | if (i == RIOCM_RX_RING_SIZE) | |
316 | riocm_warn("no record for buffer 0x%p", msg); | |
317 | } | |
318 | ||
319 | return msg; | |
320 | } | |
321 | ||
322 | /* | |
323 | * riocm_rx_fill - fills a ring of receive buffers for given cm device | |
324 | * @cm: cm_dev object | |
325 | * @nent: max number of entries to fill | |
326 | * | |
327 | * Returns: none | |
328 | */ | |
329 | static void riocm_rx_fill(struct cm_dev *cm, int nent) | |
330 | { | |
331 | int i; | |
332 | ||
333 | if (cm->rx_slots == 0) | |
334 | return; | |
335 | ||
336 | for (i = 0; i < RIOCM_RX_RING_SIZE && cm->rx_slots && nent; i++) { | |
337 | if (cm->rx_buf[i] == NULL) { | |
338 | cm->rx_buf[i] = kmalloc(RIO_MAX_MSG_SIZE, GFP_KERNEL); | |
339 | if (cm->rx_buf[i] == NULL) | |
340 | break; | |
341 | rio_add_inb_buffer(cm->mport, cmbox, cm->rx_buf[i]); | |
342 | cm->rx_slots--; | |
343 | nent--; | |
344 | } | |
345 | } | |
346 | } | |
347 | ||
348 | /* | |
349 | * riocm_rx_free - frees all receive buffers associated with given cm device | |
350 | * @cm: cm_dev object | |
351 | * | |
352 | * Returns: none | |
353 | */ | |
354 | static void riocm_rx_free(struct cm_dev *cm) | |
355 | { | |
356 | int i; | |
357 | ||
358 | for (i = 0; i < RIOCM_RX_RING_SIZE; i++) { | |
359 | if (cm->rx_buf[i] != NULL) { | |
360 | kfree(cm->rx_buf[i]); | |
361 | cm->rx_buf[i] = NULL; | |
362 | } | |
363 | } | |
364 | } | |
365 | ||
366 | /* | |
367 | * riocm_req_handler - connection request handler | |
368 | * @cm: cm_dev object | |
369 | * @req_data: pointer to the request packet | |
370 | * | |
371 | * Returns: 0 if success, or | |
372 | * -EINVAL if channel is not in correct state, | |
373 | * -ENODEV if cannot find a channel with specified ID, | |
374 | * -ENOMEM if unable to allocate memory to store the request | |
375 | */ | |
376 | static int riocm_req_handler(struct cm_dev *cm, void *req_data) | |
377 | { | |
378 | struct rio_channel *ch; | |
379 | struct conn_req *req; | |
380 | struct rio_ch_chan_hdr *hh = req_data; | |
381 | u16 chnum; | |
382 | ||
383 | chnum = ntohs(hh->dst_ch); | |
384 | ||
385 | ch = riocm_get_channel(chnum); | |
386 | ||
387 | if (!ch) | |
388 | return -ENODEV; | |
389 | ||
390 | if (ch->state != RIO_CM_LISTEN) { | |
391 | riocm_debug(RX_CMD, "channel %d is not in listen state", chnum); | |
392 | riocm_put_channel(ch); | |
393 | return -EINVAL; | |
394 | } | |
395 | ||
396 | req = kzalloc(sizeof(*req), GFP_KERNEL); | |
397 | if (!req) { | |
398 | riocm_put_channel(ch); | |
399 | return -ENOMEM; | |
400 | } | |
401 | ||
402 | req->destid = ntohl(hh->bhdr.src_id); | |
403 | req->chan = ntohs(hh->src_ch); | |
404 | req->cmdev = cm; | |
405 | ||
406 | spin_lock_bh(&ch->lock); | |
407 | list_add_tail(&req->node, &ch->accept_queue); | |
408 | spin_unlock_bh(&ch->lock); | |
409 | complete(&ch->comp); | |
410 | riocm_put_channel(ch); | |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
415 | /* | |
416 | * riocm_resp_handler - response to connection request handler | |
417 | * @resp_data: pointer to the response packet | |
418 | * | |
419 | * Returns: 0 if success, or | |
420 | * -EINVAL if channel is not in correct state, | |
421 | * -ENODEV if cannot find a channel with specified ID, | |
422 | */ | |
423 | static int riocm_resp_handler(void *resp_data) | |
424 | { | |
425 | struct rio_channel *ch; | |
426 | struct rio_ch_chan_hdr *hh = resp_data; | |
427 | u16 chnum; | |
428 | ||
429 | chnum = ntohs(hh->dst_ch); | |
430 | ch = riocm_get_channel(chnum); | |
431 | if (!ch) | |
432 | return -ENODEV; | |
433 | ||
434 | if (ch->state != RIO_CM_CONNECT) { | |
435 | riocm_put_channel(ch); | |
436 | return -EINVAL; | |
437 | } | |
438 | ||
439 | riocm_exch(ch, RIO_CM_CONNECTED); | |
440 | ch->rem_channel = ntohs(hh->src_ch); | |
441 | complete(&ch->comp); | |
442 | riocm_put_channel(ch); | |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
447 | /* | |
448 | * riocm_close_handler - channel close request handler | |
449 | * @req_data: pointer to the request packet | |
450 | * | |
451 | * Returns: 0 if success, or | |
452 | * -ENODEV if cannot find a channel with specified ID, | |
453 | * + error codes returned by riocm_ch_close. | |
454 | */ | |
455 | static int riocm_close_handler(void *data) | |
456 | { | |
457 | struct rio_channel *ch; | |
458 | struct rio_ch_chan_hdr *hh = data; | |
459 | int ret; | |
460 | ||
461 | riocm_debug(RX_CMD, "for ch=%d", ntohs(hh->dst_ch)); | |
462 | ||
463 | spin_lock_bh(&idr_lock); | |
464 | ch = idr_find(&ch_idr, ntohs(hh->dst_ch)); | |
465 | if (!ch) { | |
466 | spin_unlock_bh(&idr_lock); | |
467 | return -ENODEV; | |
468 | } | |
469 | idr_remove(&ch_idr, ch->id); | |
470 | spin_unlock_bh(&idr_lock); | |
471 | ||
472 | riocm_exch(ch, RIO_CM_DISCONNECT); | |
473 | ||
474 | ret = riocm_ch_close(ch); | |
475 | if (ret) | |
476 | riocm_debug(RX_CMD, "riocm_ch_close() returned %d", ret); | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
481 | /* | |
482 | * rio_cm_handler - function that services request (non-data) packets | |
483 | * @cm: cm_dev object | |
484 | * @data: pointer to the packet | |
485 | */ | |
486 | static void rio_cm_handler(struct cm_dev *cm, void *data) | |
487 | { | |
488 | struct rio_ch_chan_hdr *hdr; | |
489 | ||
490 | if (!rio_mport_is_running(cm->mport)) | |
491 | goto out; | |
492 | ||
493 | hdr = data; | |
494 | ||
495 | riocm_debug(RX_CMD, "OP=%x for ch=%d from %d", | |
496 | hdr->ch_op, ntohs(hdr->dst_ch), ntohs(hdr->src_ch)); | |
497 | ||
498 | switch (hdr->ch_op) { | |
499 | case CM_CONN_REQ: | |
500 | riocm_req_handler(cm, data); | |
501 | break; | |
502 | case CM_CONN_ACK: | |
503 | riocm_resp_handler(data); | |
504 | break; | |
505 | case CM_CONN_CLOSE: | |
506 | riocm_close_handler(data); | |
507 | break; | |
508 | default: | |
509 | riocm_error("Invalid packet header"); | |
510 | break; | |
511 | } | |
512 | out: | |
513 | kfree(data); | |
514 | } | |
515 | ||
516 | /* | |
517 | * rio_rx_data_handler - received data packet handler | |
518 | * @cm: cm_dev object | |
519 | * @buf: data packet | |
520 | * | |
521 | * Returns: 0 if success, or | |
522 | * -ENODEV if cannot find a channel with specified ID, | |
523 | * -EIO if channel is not in CONNECTED state, | |
524 | * -ENOMEM if channel RX queue is full (packet discarded) | |
525 | */ | |
526 | static int rio_rx_data_handler(struct cm_dev *cm, void *buf) | |
527 | { | |
528 | struct rio_ch_chan_hdr *hdr; | |
529 | struct rio_channel *ch; | |
530 | ||
531 | hdr = buf; | |
532 | ||
533 | riocm_debug(RX_DATA, "for ch=%d", ntohs(hdr->dst_ch)); | |
534 | ||
535 | ch = riocm_get_channel(ntohs(hdr->dst_ch)); | |
536 | if (!ch) { | |
537 | /* Discard data message for non-existing channel */ | |
538 | kfree(buf); | |
539 | return -ENODEV; | |
540 | } | |
541 | ||
542 | /* Place pointer to the buffer into channel's RX queue */ | |
543 | spin_lock(&ch->lock); | |
544 | ||
545 | if (ch->state != RIO_CM_CONNECTED) { | |
546 | /* Channel is not ready to receive data, discard a packet */ | |
547 | riocm_debug(RX_DATA, "ch=%d is in wrong state=%d", | |
548 | ch->id, ch->state); | |
549 | spin_unlock(&ch->lock); | |
550 | kfree(buf); | |
551 | riocm_put_channel(ch); | |
552 | return -EIO; | |
553 | } | |
554 | ||
555 | if (ch->rx_ring.count == RIOCM_RX_RING_SIZE) { | |
556 | /* If RX ring is full, discard a packet */ | |
557 | riocm_debug(RX_DATA, "ch=%d is full", ch->id); | |
558 | spin_unlock(&ch->lock); | |
559 | kfree(buf); | |
560 | riocm_put_channel(ch); | |
561 | return -ENOMEM; | |
562 | } | |
563 | ||
564 | ch->rx_ring.buf[ch->rx_ring.head] = buf; | |
565 | ch->rx_ring.head++; | |
566 | ch->rx_ring.count++; | |
567 | ch->rx_ring.head %= RIOCM_RX_RING_SIZE; | |
568 | ||
569 | complete(&ch->comp); | |
570 | ||
571 | spin_unlock(&ch->lock); | |
572 | riocm_put_channel(ch); | |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
577 | /* | |
578 | * rio_ibmsg_handler - inbound message packet handler | |
579 | */ | |
580 | static void rio_ibmsg_handler(struct work_struct *work) | |
581 | { | |
582 | struct cm_dev *cm = container_of(work, struct cm_dev, rx_work); | |
583 | void *data; | |
584 | struct rio_ch_chan_hdr *hdr; | |
585 | ||
586 | if (!rio_mport_is_running(cm->mport)) | |
587 | return; | |
588 | ||
589 | while (1) { | |
590 | mutex_lock(&cm->rx_lock); | |
591 | data = riocm_rx_get_msg(cm); | |
592 | if (data) | |
593 | riocm_rx_fill(cm, 1); | |
594 | mutex_unlock(&cm->rx_lock); | |
595 | ||
596 | if (data == NULL) | |
597 | break; | |
598 | ||
599 | hdr = data; | |
600 | ||
601 | if (hdr->bhdr.type != RIO_CM_CHAN) { | |
602 | /* For now simply discard packets other than channel */ | |
603 | riocm_error("Unsupported TYPE code (0x%x). Msg dropped", | |
604 | hdr->bhdr.type); | |
605 | kfree(data); | |
606 | continue; | |
607 | } | |
608 | ||
609 | /* Process a channel message */ | |
610 | if (hdr->ch_op == CM_DATA_MSG) | |
611 | rio_rx_data_handler(cm, data); | |
612 | else | |
613 | rio_cm_handler(cm, data); | |
614 | } | |
615 | } | |
616 | ||
617 | static void riocm_inb_msg_event(struct rio_mport *mport, void *dev_id, | |
618 | int mbox, int slot) | |
619 | { | |
620 | struct cm_dev *cm = dev_id; | |
621 | ||
622 | if (rio_mport_is_running(cm->mport) && !work_pending(&cm->rx_work)) | |
623 | queue_work(cm->rx_wq, &cm->rx_work); | |
624 | } | |
625 | ||
626 | /* | |
627 | * rio_txcq_handler - TX completion handler | |
628 | * @cm: cm_dev object | |
629 | * @slot: TX queue slot | |
630 | * | |
631 | * TX completion handler also ensures that pending request packets are placed | |
632 | * into transmit queue as soon as a free slot becomes available. This is done | |
633 | * to give higher priority to request packets during high intensity data flow. | |
634 | */ | |
635 | static void rio_txcq_handler(struct cm_dev *cm, int slot) | |
636 | { | |
637 | int ack_slot; | |
638 | ||
639 | /* ATTN: Add TX completion notification if/when direct buffer | |
640 | * transfer is implemented. At this moment only correct tracking | |
641 | * of tx_count is important. | |
642 | */ | |
643 | riocm_debug(TX_EVENT, "for mport_%d slot %d tx_cnt %d", | |
644 | cm->mport->id, slot, cm->tx_cnt); | |
645 | ||
646 | spin_lock(&cm->tx_lock); | |
647 | ack_slot = cm->tx_ack_slot; | |
648 | ||
649 | if (ack_slot == slot) | |
650 | riocm_debug(TX_EVENT, "slot == ack_slot"); | |
651 | ||
652 | while (cm->tx_cnt && ((ack_slot != slot) || | |
653 | (cm->tx_cnt == RIOCM_TX_RING_SIZE))) { | |
654 | ||
655 | cm->tx_buf[ack_slot] = NULL; | |
656 | ++ack_slot; | |
657 | ack_slot &= (RIOCM_TX_RING_SIZE - 1); | |
658 | cm->tx_cnt--; | |
659 | } | |
660 | ||
661 | if (cm->tx_cnt < 0 || cm->tx_cnt > RIOCM_TX_RING_SIZE) | |
662 | riocm_error("tx_cnt %d out of sync", cm->tx_cnt); | |
663 | ||
664 | WARN_ON((cm->tx_cnt < 0) || (cm->tx_cnt > RIOCM_TX_RING_SIZE)); | |
665 | ||
666 | cm->tx_ack_slot = ack_slot; | |
667 | ||
668 | /* | |
669 | * If there are pending requests, insert them into transmit queue | |
670 | */ | |
671 | if (!list_empty(&cm->tx_reqs) && (cm->tx_cnt < RIOCM_TX_RING_SIZE)) { | |
672 | struct tx_req *req, *_req; | |
673 | int rc; | |
674 | ||
675 | list_for_each_entry_safe(req, _req, &cm->tx_reqs, node) { | |
676 | list_del(&req->node); | |
677 | cm->tx_buf[cm->tx_slot] = req->buffer; | |
678 | rc = rio_add_outb_message(cm->mport, req->rdev, cmbox, | |
679 | req->buffer, req->len); | |
680 | kfree(req->buffer); | |
681 | kfree(req); | |
682 | ||
683 | ++cm->tx_cnt; | |
684 | ++cm->tx_slot; | |
685 | cm->tx_slot &= (RIOCM_TX_RING_SIZE - 1); | |
686 | if (cm->tx_cnt == RIOCM_TX_RING_SIZE) | |
687 | break; | |
688 | } | |
689 | } | |
690 | ||
691 | spin_unlock(&cm->tx_lock); | |
692 | } | |
693 | ||
694 | static void riocm_outb_msg_event(struct rio_mport *mport, void *dev_id, | |
695 | int mbox, int slot) | |
696 | { | |
697 | struct cm_dev *cm = dev_id; | |
698 | ||
699 | if (cm && rio_mport_is_running(cm->mport)) | |
700 | rio_txcq_handler(cm, slot); | |
701 | } | |
702 | ||
703 | static int riocm_queue_req(struct cm_dev *cm, struct rio_dev *rdev, | |
704 | void *buffer, size_t len) | |
705 | { | |
706 | unsigned long flags; | |
707 | struct tx_req *treq; | |
708 | ||
709 | treq = kzalloc(sizeof(*treq), GFP_KERNEL); | |
710 | if (treq == NULL) | |
711 | return -ENOMEM; | |
712 | ||
713 | treq->rdev = rdev; | |
714 | treq->buffer = buffer; | |
715 | treq->len = len; | |
716 | ||
717 | spin_lock_irqsave(&cm->tx_lock, flags); | |
718 | list_add_tail(&treq->node, &cm->tx_reqs); | |
719 | spin_unlock_irqrestore(&cm->tx_lock, flags); | |
720 | return 0; | |
721 | } | |
722 | ||
723 | /* | |
724 | * riocm_post_send - helper function that places packet into msg TX queue | |
725 | * @cm: cm_dev object | |
726 | * @rdev: target RapidIO device object (required by outbound msg interface) | |
727 | * @buffer: pointer to a packet buffer to send | |
728 | * @len: length of data to transfer | |
729 | * @req: request priority flag | |
730 | * | |
731 | * Returns: 0 if success, or error code otherwise. | |
732 | */ | |
733 | static int riocm_post_send(struct cm_dev *cm, struct rio_dev *rdev, | |
734 | void *buffer, size_t len) | |
735 | { | |
736 | int rc; | |
737 | unsigned long flags; | |
738 | ||
739 | spin_lock_irqsave(&cm->tx_lock, flags); | |
740 | ||
741 | if (cm->mport == NULL) { | |
742 | rc = -ENODEV; | |
743 | goto err_out; | |
744 | } | |
745 | ||
746 | if (cm->tx_cnt == RIOCM_TX_RING_SIZE) { | |
747 | riocm_debug(TX, "Tx Queue is full"); | |
748 | rc = -EBUSY; | |
749 | goto err_out; | |
750 | } | |
751 | ||
752 | cm->tx_buf[cm->tx_slot] = buffer; | |
753 | rc = rio_add_outb_message(cm->mport, rdev, cmbox, buffer, len); | |
754 | ||
755 | riocm_debug(TX, "Add buf@%p destid=%x tx_slot=%d tx_cnt=%d", | |
756 | buffer, rdev->destid, cm->tx_slot, cm->tx_cnt); | |
757 | ||
758 | ++cm->tx_cnt; | |
759 | ++cm->tx_slot; | |
760 | cm->tx_slot &= (RIOCM_TX_RING_SIZE - 1); | |
761 | ||
762 | err_out: | |
763 | spin_unlock_irqrestore(&cm->tx_lock, flags); | |
764 | return rc; | |
765 | } | |
766 | ||
767 | /* | |
768 | * riocm_ch_send - sends a data packet to a remote device | |
769 | * @ch_id: local channel ID | |
770 | * @buf: pointer to a data buffer to send (including CM header) | |
771 | * @len: length of data to transfer (including CM header) | |
772 | * | |
773 | * ATTN: ASSUMES THAT THE HEADER SPACE IS RESERVED PART OF THE DATA PACKET | |
774 | * | |
775 | * Returns: 0 if success, or | |
776 | * -EINVAL if one or more input parameters is/are not valid, | |
777 | * -ENODEV if cannot find a channel with specified ID, | |
778 | * -EAGAIN if a channel is not in CONNECTED state, | |
779 | * + error codes returned by HW send routine. | |
780 | */ | |
781 | static int riocm_ch_send(u16 ch_id, void *buf, int len) | |
782 | { | |
783 | struct rio_channel *ch; | |
784 | struct rio_ch_chan_hdr *hdr; | |
785 | int ret; | |
786 | ||
787 | if (buf == NULL || ch_id == 0 || len == 0 || len > RIO_MAX_MSG_SIZE) | |
788 | return -EINVAL; | |
789 | ||
790 | ch = riocm_get_channel(ch_id); | |
791 | if (!ch) { | |
792 | riocm_error("%s(%d) ch_%d not found", current->comm, | |
793 | task_pid_nr(current), ch_id); | |
794 | return -ENODEV; | |
795 | } | |
796 | ||
797 | if (!riocm_cmp(ch, RIO_CM_CONNECTED)) { | |
798 | ret = -EAGAIN; | |
799 | goto err_out; | |
800 | } | |
801 | ||
802 | /* | |
803 | * Fill buffer header section with corresponding channel data | |
804 | */ | |
805 | hdr = buf; | |
806 | ||
807 | hdr->bhdr.src_id = htonl(ch->loc_destid); | |
808 | hdr->bhdr.dst_id = htonl(ch->rem_destid); | |
809 | hdr->bhdr.src_mbox = cmbox; | |
810 | hdr->bhdr.dst_mbox = cmbox; | |
811 | hdr->bhdr.type = RIO_CM_CHAN; | |
812 | hdr->ch_op = CM_DATA_MSG; | |
813 | hdr->dst_ch = htons(ch->rem_channel); | |
814 | hdr->src_ch = htons(ch->id); | |
815 | hdr->msg_len = htons((u16)len); | |
816 | ||
817 | /* ATTN: the function call below relies on the fact that underlying | |
818 | * HW-specific add_outb_message() routine copies TX data into its own | |
819 | * internal transfer buffer (true for all RIONET compatible mport | |
820 | * drivers). Must be reviewed if mport driver uses the buffer directly. | |
821 | */ | |
822 | ||
823 | ret = riocm_post_send(ch->cmdev, ch->rdev, buf, len); | |
824 | if (ret) | |
825 | riocm_debug(TX, "ch %d send_err=%d", ch->id, ret); | |
826 | err_out: | |
827 | riocm_put_channel(ch); | |
828 | return ret; | |
829 | } | |
830 | ||
831 | static int riocm_ch_free_rxbuf(struct rio_channel *ch, void *buf) | |
832 | { | |
833 | int i, ret = -EINVAL; | |
834 | ||
835 | spin_lock_bh(&ch->lock); | |
836 | ||
837 | for (i = 0; i < RIOCM_RX_RING_SIZE; i++) { | |
838 | if (ch->rx_ring.inuse[i] == buf) { | |
839 | ch->rx_ring.inuse[i] = NULL; | |
840 | ch->rx_ring.inuse_cnt--; | |
841 | ret = 0; | |
842 | break; | |
843 | } | |
844 | } | |
845 | ||
846 | spin_unlock_bh(&ch->lock); | |
847 | ||
848 | if (!ret) | |
849 | kfree(buf); | |
850 | ||
851 | return ret; | |
852 | } | |
853 | ||
854 | /* | |
855 | * riocm_ch_receive - fetch a data packet received for the specified channel | |
856 | * @ch: local channel ID | |
857 | * @buf: pointer to a packet buffer | |
858 | * @timeout: timeout to wait for incoming packet (in jiffies) | |
859 | * | |
860 | * Returns: 0 and valid buffer pointer if success, or NULL pointer and one of: | |
861 | * -EAGAIN if a channel is not in CONNECTED state, | |
862 | * -ENOMEM if in-use tracking queue is full, | |
863 | * -ETIME if wait timeout expired, | |
864 | * -EINTR if wait was interrupted. | |
865 | */ | |
866 | static int riocm_ch_receive(struct rio_channel *ch, void **buf, long timeout) | |
867 | { | |
868 | void *rxmsg = NULL; | |
869 | int i, ret = 0; | |
870 | long wret; | |
871 | ||
872 | if (!riocm_cmp(ch, RIO_CM_CONNECTED)) { | |
873 | ret = -EAGAIN; | |
874 | goto out; | |
875 | } | |
876 | ||
877 | if (ch->rx_ring.inuse_cnt == RIOCM_RX_RING_SIZE) { | |
878 | /* If we do not have entries to track buffers given to upper | |
879 | * layer, reject request. | |
880 | */ | |
881 | ret = -ENOMEM; | |
882 | goto out; | |
883 | } | |
884 | ||
885 | wret = wait_for_completion_interruptible_timeout(&ch->comp, timeout); | |
886 | ||
887 | riocm_debug(WAIT, "wait on %d returned %ld", ch->id, wret); | |
888 | ||
889 | if (!wret) | |
890 | ret = -ETIME; | |
891 | else if (wret == -ERESTARTSYS) | |
892 | ret = -EINTR; | |
893 | else | |
894 | ret = riocm_cmp(ch, RIO_CM_CONNECTED) ? 0 : -ECONNRESET; | |
895 | ||
896 | if (ret) | |
897 | goto out; | |
898 | ||
899 | spin_lock_bh(&ch->lock); | |
900 | ||
901 | rxmsg = ch->rx_ring.buf[ch->rx_ring.tail]; | |
902 | ch->rx_ring.buf[ch->rx_ring.tail] = NULL; | |
903 | ch->rx_ring.count--; | |
904 | ch->rx_ring.tail++; | |
905 | ch->rx_ring.tail %= RIOCM_RX_RING_SIZE; | |
906 | ret = -ENOMEM; | |
907 | ||
908 | for (i = 0; i < RIOCM_RX_RING_SIZE; i++) { | |
909 | if (ch->rx_ring.inuse[i] == NULL) { | |
910 | ch->rx_ring.inuse[i] = rxmsg; | |
911 | ch->rx_ring.inuse_cnt++; | |
912 | ret = 0; | |
913 | break; | |
914 | } | |
915 | } | |
916 | ||
917 | if (ret) { | |
918 | /* We have no entry to store pending message: drop it */ | |
919 | kfree(rxmsg); | |
920 | rxmsg = NULL; | |
921 | } | |
922 | ||
923 | spin_unlock_bh(&ch->lock); | |
924 | out: | |
925 | *buf = rxmsg; | |
926 | return ret; | |
927 | } | |
928 | ||
929 | /* | |
930 | * riocm_ch_connect - sends a connect request to a remote device | |
931 | * @loc_ch: local channel ID | |
932 | * @cm: CM device to send connect request | |
933 | * @peer: target RapidIO device | |
934 | * @rem_ch: remote channel ID | |
935 | * | |
936 | * Returns: 0 if success, or | |
937 | * -EINVAL if the channel is not in IDLE state, | |
938 | * -EAGAIN if no connection request available immediately, | |
939 | * -ETIME if ACK response timeout expired, | |
940 | * -EINTR if wait for response was interrupted. | |
941 | */ | |
942 | static int riocm_ch_connect(u16 loc_ch, struct cm_dev *cm, | |
943 | struct cm_peer *peer, u16 rem_ch) | |
944 | { | |
945 | struct rio_channel *ch = NULL; | |
946 | struct rio_ch_chan_hdr *hdr; | |
947 | int ret; | |
948 | long wret; | |
949 | ||
950 | ch = riocm_get_channel(loc_ch); | |
951 | if (!ch) | |
952 | return -ENODEV; | |
953 | ||
954 | if (!riocm_cmp_exch(ch, RIO_CM_IDLE, RIO_CM_CONNECT)) { | |
955 | ret = -EINVAL; | |
956 | goto conn_done; | |
957 | } | |
958 | ||
959 | ch->cmdev = cm; | |
960 | ch->rdev = peer->rdev; | |
961 | ch->context = NULL; | |
962 | ch->loc_destid = cm->mport->host_deviceid; | |
963 | ch->rem_channel = rem_ch; | |
964 | ||
965 | /* | |
966 | * Send connect request to the remote RapidIO device | |
967 | */ | |
968 | ||
969 | hdr = kzalloc(sizeof(*hdr), GFP_KERNEL); | |
970 | if (hdr == NULL) { | |
971 | ret = -ENOMEM; | |
972 | goto conn_done; | |
973 | } | |
974 | ||
975 | hdr->bhdr.src_id = htonl(ch->loc_destid); | |
976 | hdr->bhdr.dst_id = htonl(peer->rdev->destid); | |
977 | hdr->bhdr.src_mbox = cmbox; | |
978 | hdr->bhdr.dst_mbox = cmbox; | |
979 | hdr->bhdr.type = RIO_CM_CHAN; | |
980 | hdr->ch_op = CM_CONN_REQ; | |
981 | hdr->dst_ch = htons(rem_ch); | |
982 | hdr->src_ch = htons(loc_ch); | |
983 | ||
984 | /* ATTN: the function call below relies on the fact that underlying | |
985 | * HW-specific add_outb_message() routine copies TX data into its | |
986 | * internal transfer buffer. Must be reviewed if mport driver uses | |
987 | * this buffer directly. | |
988 | */ | |
989 | ret = riocm_post_send(cm, peer->rdev, hdr, sizeof(*hdr)); | |
990 | ||
991 | if (ret != -EBUSY) { | |
992 | kfree(hdr); | |
993 | } else { | |
994 | ret = riocm_queue_req(cm, peer->rdev, hdr, sizeof(*hdr)); | |
995 | if (ret) | |
996 | kfree(hdr); | |
997 | } | |
998 | ||
999 | if (ret) { | |
1000 | riocm_cmp_exch(ch, RIO_CM_CONNECT, RIO_CM_IDLE); | |
1001 | goto conn_done; | |
1002 | } | |
1003 | ||
1004 | /* Wait for connect response from the remote device */ | |
1005 | wret = wait_for_completion_interruptible_timeout(&ch->comp, | |
1006 | RIOCM_CONNECT_TO * HZ); | |
1007 | riocm_debug(WAIT, "wait on %d returns %ld", ch->id, wret); | |
1008 | ||
1009 | if (!wret) | |
1010 | ret = -ETIME; | |
1011 | else if (wret == -ERESTARTSYS) | |
1012 | ret = -EINTR; | |
1013 | else | |
1014 | ret = riocm_cmp(ch, RIO_CM_CONNECTED) ? 0 : -1; | |
1015 | ||
1016 | conn_done: | |
1017 | riocm_put_channel(ch); | |
1018 | return ret; | |
1019 | } | |
1020 | ||
1021 | static int riocm_send_ack(struct rio_channel *ch) | |
1022 | { | |
1023 | struct rio_ch_chan_hdr *hdr; | |
1024 | int ret; | |
1025 | ||
1026 | hdr = kzalloc(sizeof(*hdr), GFP_KERNEL); | |
1027 | if (hdr == NULL) | |
1028 | return -ENOMEM; | |
1029 | ||
1030 | hdr->bhdr.src_id = htonl(ch->loc_destid); | |
1031 | hdr->bhdr.dst_id = htonl(ch->rem_destid); | |
1032 | hdr->dst_ch = htons(ch->rem_channel); | |
1033 | hdr->src_ch = htons(ch->id); | |
1034 | hdr->bhdr.src_mbox = cmbox; | |
1035 | hdr->bhdr.dst_mbox = cmbox; | |
1036 | hdr->bhdr.type = RIO_CM_CHAN; | |
1037 | hdr->ch_op = CM_CONN_ACK; | |
1038 | ||
1039 | /* ATTN: the function call below relies on the fact that underlying | |
1040 | * add_outb_message() routine copies TX data into its internal transfer | |
1041 | * buffer. Review if switching to direct buffer version. | |
1042 | */ | |
1043 | ret = riocm_post_send(ch->cmdev, ch->rdev, hdr, sizeof(*hdr)); | |
1044 | ||
1045 | if (ret == -EBUSY && !riocm_queue_req(ch->cmdev, | |
1046 | ch->rdev, hdr, sizeof(*hdr))) | |
1047 | return 0; | |
1048 | kfree(hdr); | |
1049 | ||
1050 | if (ret) | |
1051 | riocm_error("send ACK to ch_%d on %s failed (ret=%d)", | |
1052 | ch->id, rio_name(ch->rdev), ret); | |
1053 | return ret; | |
1054 | } | |
1055 | ||
1056 | /* | |
1057 | * riocm_ch_accept - accept incoming connection request | |
1058 | * @ch_id: channel ID | |
1059 | * @new_ch_id: local mport device | |
1060 | * @timeout: wait timeout (if 0 non-blocking call, do not wait if connection | |
1061 | * request is not available). | |
1062 | * | |
1063 | * Returns: pointer to new channel struct if success, or error-valued pointer: | |
1064 | * -ENODEV - cannot find specified channel or mport, | |
1065 | * -EINVAL - the channel is not in IDLE state, | |
1066 | * -EAGAIN - no connection request available immediately (timeout=0), | |
1067 | * -ENOMEM - unable to allocate new channel, | |
1068 | * -ETIME - wait timeout expired, | |
1069 | * -EINTR - wait was interrupted. | |
1070 | */ | |
1071 | static struct rio_channel *riocm_ch_accept(u16 ch_id, u16 *new_ch_id, | |
1072 | long timeout) | |
1073 | { | |
73984137 DC |
1074 | struct rio_channel *ch; |
1075 | struct rio_channel *new_ch; | |
b6e8d4aa AB |
1076 | struct conn_req *req; |
1077 | struct cm_peer *peer; | |
1078 | int found = 0; | |
1079 | int err = 0; | |
1080 | long wret; | |
1081 | ||
1082 | ch = riocm_get_channel(ch_id); | |
1083 | if (!ch) | |
1084 | return ERR_PTR(-EINVAL); | |
1085 | ||
1086 | if (!riocm_cmp(ch, RIO_CM_LISTEN)) { | |
1087 | err = -EINVAL; | |
1088 | goto err_put; | |
1089 | } | |
1090 | ||
1091 | /* Don't sleep if this is a non blocking call */ | |
1092 | if (!timeout) { | |
1093 | if (!try_wait_for_completion(&ch->comp)) { | |
1094 | err = -EAGAIN; | |
1095 | goto err_put; | |
1096 | } | |
1097 | } else { | |
1098 | riocm_debug(WAIT, "on %d", ch->id); | |
1099 | ||
1100 | wret = wait_for_completion_interruptible_timeout(&ch->comp, | |
1101 | timeout); | |
1102 | if (!wret) { | |
1103 | err = -ETIME; | |
1104 | goto err_put; | |
1105 | } else if (wret == -ERESTARTSYS) { | |
1106 | err = -EINTR; | |
1107 | goto err_put; | |
1108 | } | |
1109 | } | |
1110 | ||
1111 | spin_lock_bh(&ch->lock); | |
1112 | ||
1113 | if (ch->state != RIO_CM_LISTEN) { | |
1114 | err = -ECANCELED; | |
1115 | } else if (list_empty(&ch->accept_queue)) { | |
1116 | riocm_debug(WAIT, "on %d accept_queue is empty on completion", | |
1117 | ch->id); | |
1118 | err = -EIO; | |
1119 | } | |
1120 | ||
1121 | spin_unlock_bh(&ch->lock); | |
1122 | ||
1123 | if (err) { | |
1124 | riocm_debug(WAIT, "on %d returns %d", ch->id, err); | |
1125 | goto err_put; | |
1126 | } | |
1127 | ||
1128 | /* Create new channel for this connection */ | |
1129 | new_ch = riocm_ch_alloc(RIOCM_CHNUM_AUTO); | |
1130 | ||
1131 | if (IS_ERR(new_ch)) { | |
1132 | riocm_error("failed to get channel for new req (%ld)", | |
1133 | PTR_ERR(new_ch)); | |
1134 | err = -ENOMEM; | |
1135 | goto err_put; | |
1136 | } | |
1137 | ||
1138 | spin_lock_bh(&ch->lock); | |
1139 | ||
1140 | req = list_first_entry(&ch->accept_queue, struct conn_req, node); | |
1141 | list_del(&req->node); | |
1142 | new_ch->cmdev = ch->cmdev; | |
1143 | new_ch->loc_destid = ch->loc_destid; | |
1144 | new_ch->rem_destid = req->destid; | |
1145 | new_ch->rem_channel = req->chan; | |
1146 | ||
1147 | spin_unlock_bh(&ch->lock); | |
1148 | riocm_put_channel(ch); | |
73984137 | 1149 | ch = NULL; |
b6e8d4aa AB |
1150 | kfree(req); |
1151 | ||
1152 | down_read(&rdev_sem); | |
1153 | /* Find requester's device object */ | |
1154 | list_for_each_entry(peer, &new_ch->cmdev->peers, node) { | |
1155 | if (peer->rdev->destid == new_ch->rem_destid) { | |
1156 | riocm_debug(RX_CMD, "found matching device(%s)", | |
1157 | rio_name(peer->rdev)); | |
1158 | found = 1; | |
1159 | break; | |
1160 | } | |
1161 | } | |
1162 | up_read(&rdev_sem); | |
1163 | ||
1164 | if (!found) { | |
1165 | /* If peer device object not found, simply ignore the request */ | |
1166 | err = -ENODEV; | |
73984137 | 1167 | goto err_put_new_ch; |
b6e8d4aa AB |
1168 | } |
1169 | ||
1170 | new_ch->rdev = peer->rdev; | |
1171 | new_ch->state = RIO_CM_CONNECTED; | |
1172 | spin_lock_init(&new_ch->lock); | |
1173 | ||
1174 | /* Acknowledge the connection request. */ | |
1175 | riocm_send_ack(new_ch); | |
1176 | ||
1177 | *new_ch_id = new_ch->id; | |
1178 | return new_ch; | |
73984137 DC |
1179 | |
1180 | err_put_new_ch: | |
1181 | spin_lock_bh(&idr_lock); | |
1182 | idr_remove(&ch_idr, new_ch->id); | |
1183 | spin_unlock_bh(&idr_lock); | |
1184 | riocm_put_channel(new_ch); | |
1185 | ||
b6e8d4aa | 1186 | err_put: |
73984137 DC |
1187 | if (ch) |
1188 | riocm_put_channel(ch); | |
b6e8d4aa AB |
1189 | *new_ch_id = 0; |
1190 | return ERR_PTR(err); | |
1191 | } | |
1192 | ||
1193 | /* | |
1194 | * riocm_ch_listen - puts a channel into LISTEN state | |
1195 | * @ch_id: channel ID | |
1196 | * | |
1197 | * Returns: 0 if success, or | |
1198 | * -EINVAL if the specified channel does not exists or | |
1199 | * is not in CHAN_BOUND state. | |
1200 | */ | |
1201 | static int riocm_ch_listen(u16 ch_id) | |
1202 | { | |
1203 | struct rio_channel *ch = NULL; | |
1204 | int ret = 0; | |
1205 | ||
1206 | riocm_debug(CHOP, "(ch_%d)", ch_id); | |
1207 | ||
1208 | ch = riocm_get_channel(ch_id); | |
5ac188b1 DC |
1209 | if (!ch) |
1210 | return -EINVAL; | |
1211 | if (!riocm_cmp_exch(ch, RIO_CM_CHAN_BOUND, RIO_CM_LISTEN)) | |
b6e8d4aa AB |
1212 | ret = -EINVAL; |
1213 | riocm_put_channel(ch); | |
1214 | return ret; | |
1215 | } | |
1216 | ||
1217 | /* | |
1218 | * riocm_ch_bind - associate a channel object and an mport device | |
1219 | * @ch_id: channel ID | |
1220 | * @mport_id: local mport device ID | |
1221 | * @context: pointer to the additional caller's context | |
1222 | * | |
1223 | * Returns: 0 if success, or | |
1224 | * -ENODEV if cannot find specified mport, | |
1225 | * -EINVAL if the specified channel does not exist or | |
1226 | * is not in IDLE state. | |
1227 | */ | |
1228 | static int riocm_ch_bind(u16 ch_id, u8 mport_id, void *context) | |
1229 | { | |
1230 | struct rio_channel *ch = NULL; | |
1231 | struct cm_dev *cm; | |
1232 | int rc = -ENODEV; | |
1233 | ||
1234 | riocm_debug(CHOP, "ch_%d to mport_%d", ch_id, mport_id); | |
1235 | ||
1236 | /* Find matching cm_dev object */ | |
1237 | down_read(&rdev_sem); | |
1238 | list_for_each_entry(cm, &cm_dev_list, list) { | |
1239 | if ((cm->mport->id == mport_id) && | |
1240 | rio_mport_is_running(cm->mport)) { | |
1241 | rc = 0; | |
1242 | break; | |
1243 | } | |
1244 | } | |
1245 | ||
1246 | if (rc) | |
1247 | goto exit; | |
1248 | ||
1249 | ch = riocm_get_channel(ch_id); | |
1250 | if (!ch) { | |
1251 | rc = -EINVAL; | |
1252 | goto exit; | |
1253 | } | |
1254 | ||
1255 | spin_lock_bh(&ch->lock); | |
1256 | if (ch->state != RIO_CM_IDLE) { | |
1257 | spin_unlock_bh(&ch->lock); | |
1258 | rc = -EINVAL; | |
1259 | goto err_put; | |
1260 | } | |
1261 | ||
1262 | ch->cmdev = cm; | |
1263 | ch->loc_destid = cm->mport->host_deviceid; | |
1264 | ch->context = context; | |
1265 | ch->state = RIO_CM_CHAN_BOUND; | |
1266 | spin_unlock_bh(&ch->lock); | |
1267 | err_put: | |
1268 | riocm_put_channel(ch); | |
1269 | exit: | |
1270 | up_read(&rdev_sem); | |
1271 | return rc; | |
1272 | } | |
1273 | ||
1274 | /* | |
1275 | * riocm_ch_alloc - channel object allocation helper routine | |
1276 | * @ch_num: channel ID (1 ... RIOCM_MAX_CHNUM, 0 = automatic) | |
1277 | * | |
1278 | * Return value: pointer to newly created channel object, | |
1279 | * or error-valued pointer | |
1280 | */ | |
1281 | static struct rio_channel *riocm_ch_alloc(u16 ch_num) | |
1282 | { | |
1283 | int id; | |
1284 | int start, end; | |
1285 | struct rio_channel *ch; | |
1286 | ||
1287 | ch = kzalloc(sizeof(*ch), GFP_KERNEL); | |
1288 | if (!ch) | |
1289 | return ERR_PTR(-ENOMEM); | |
1290 | ||
1291 | if (ch_num) { | |
1292 | /* If requested, try to obtain the specified channel ID */ | |
1293 | start = ch_num; | |
1294 | end = ch_num + 1; | |
1295 | } else { | |
1296 | /* Obtain channel ID from the dynamic allocation range */ | |
1297 | start = chstart; | |
1298 | end = RIOCM_MAX_CHNUM + 1; | |
1299 | } | |
1300 | ||
1301 | idr_preload(GFP_KERNEL); | |
1302 | spin_lock_bh(&idr_lock); | |
1303 | id = idr_alloc_cyclic(&ch_idr, ch, start, end, GFP_NOWAIT); | |
1304 | spin_unlock_bh(&idr_lock); | |
1305 | idr_preload_end(); | |
1306 | ||
1307 | if (id < 0) { | |
1308 | kfree(ch); | |
1309 | return ERR_PTR(id == -ENOSPC ? -EBUSY : id); | |
1310 | } | |
1311 | ||
1312 | ch->id = (u16)id; | |
1313 | ch->state = RIO_CM_IDLE; | |
1314 | spin_lock_init(&ch->lock); | |
1315 | INIT_LIST_HEAD(&ch->accept_queue); | |
1316 | INIT_LIST_HEAD(&ch->ch_node); | |
1317 | init_completion(&ch->comp); | |
1318 | init_completion(&ch->comp_close); | |
1319 | kref_init(&ch->ref); | |
1320 | ch->rx_ring.head = 0; | |
1321 | ch->rx_ring.tail = 0; | |
1322 | ch->rx_ring.count = 0; | |
1323 | ch->rx_ring.inuse_cnt = 0; | |
1324 | ||
1325 | return ch; | |
1326 | } | |
1327 | ||
1328 | /* | |
1329 | * riocm_ch_create - creates a new channel object and allocates ID for it | |
1330 | * @ch_num: channel ID (1 ... RIOCM_MAX_CHNUM, 0 = automatic) | |
1331 | * | |
1332 | * Allocates and initializes a new channel object. If the parameter ch_num > 0 | |
1333 | * and is within the valid range, riocm_ch_create tries to allocate the | |
1334 | * specified ID for the new channel. If ch_num = 0, channel ID will be assigned | |
1335 | * automatically from the range (chstart ... RIOCM_MAX_CHNUM). | |
1336 | * Module parameter 'chstart' defines start of an ID range available for dynamic | |
1337 | * allocation. Range below 'chstart' is reserved for pre-defined ID numbers. | |
1338 | * Available channel numbers are limited by 16-bit size of channel numbers used | |
1339 | * in the packet header. | |
1340 | * | |
1341 | * Return value: PTR to rio_channel structure if successful (with channel number | |
1342 | * updated via pointer) or error-valued pointer if error. | |
1343 | */ | |
1344 | static struct rio_channel *riocm_ch_create(u16 *ch_num) | |
1345 | { | |
1346 | struct rio_channel *ch = NULL; | |
1347 | ||
1348 | ch = riocm_ch_alloc(*ch_num); | |
1349 | ||
1350 | if (IS_ERR(ch)) | |
1351 | riocm_debug(CHOP, "Failed to allocate channel %d (err=%ld)", | |
1352 | *ch_num, PTR_ERR(ch)); | |
1353 | else | |
1354 | *ch_num = ch->id; | |
1355 | ||
1356 | return ch; | |
1357 | } | |
1358 | ||
1359 | /* | |
1360 | * riocm_ch_free - channel object release routine | |
1361 | * @ref: pointer to a channel's kref structure | |
1362 | */ | |
1363 | static void riocm_ch_free(struct kref *ref) | |
1364 | { | |
1365 | struct rio_channel *ch = container_of(ref, struct rio_channel, ref); | |
1366 | int i; | |
1367 | ||
1368 | riocm_debug(CHOP, "(ch_%d)", ch->id); | |
1369 | ||
1370 | if (ch->rx_ring.inuse_cnt) { | |
1371 | for (i = 0; | |
1372 | i < RIOCM_RX_RING_SIZE && ch->rx_ring.inuse_cnt; i++) { | |
1373 | if (ch->rx_ring.inuse[i] != NULL) { | |
1374 | kfree(ch->rx_ring.inuse[i]); | |
1375 | ch->rx_ring.inuse_cnt--; | |
1376 | } | |
1377 | } | |
1378 | } | |
1379 | ||
1380 | if (ch->rx_ring.count) | |
1381 | for (i = 0; i < RIOCM_RX_RING_SIZE && ch->rx_ring.count; i++) { | |
1382 | if (ch->rx_ring.buf[i] != NULL) { | |
1383 | kfree(ch->rx_ring.buf[i]); | |
1384 | ch->rx_ring.count--; | |
1385 | } | |
1386 | } | |
1387 | ||
1388 | complete(&ch->comp_close); | |
1389 | } | |
1390 | ||
1391 | static int riocm_send_close(struct rio_channel *ch) | |
1392 | { | |
1393 | struct rio_ch_chan_hdr *hdr; | |
1394 | int ret; | |
1395 | ||
1396 | /* | |
1397 | * Send CH_CLOSE notification to the remote RapidIO device | |
1398 | */ | |
1399 | ||
1400 | hdr = kzalloc(sizeof(*hdr), GFP_KERNEL); | |
1401 | if (hdr == NULL) | |
1402 | return -ENOMEM; | |
1403 | ||
1404 | hdr->bhdr.src_id = htonl(ch->loc_destid); | |
1405 | hdr->bhdr.dst_id = htonl(ch->rem_destid); | |
1406 | hdr->bhdr.src_mbox = cmbox; | |
1407 | hdr->bhdr.dst_mbox = cmbox; | |
1408 | hdr->bhdr.type = RIO_CM_CHAN; | |
1409 | hdr->ch_op = CM_CONN_CLOSE; | |
1410 | hdr->dst_ch = htons(ch->rem_channel); | |
1411 | hdr->src_ch = htons(ch->id); | |
1412 | ||
1413 | /* ATTN: the function call below relies on the fact that underlying | |
1414 | * add_outb_message() routine copies TX data into its internal transfer | |
1415 | * buffer. Needs to be reviewed if switched to direct buffer mode. | |
1416 | */ | |
1417 | ret = riocm_post_send(ch->cmdev, ch->rdev, hdr, sizeof(*hdr)); | |
1418 | ||
1419 | if (ret == -EBUSY && !riocm_queue_req(ch->cmdev, ch->rdev, | |
1420 | hdr, sizeof(*hdr))) | |
1421 | return 0; | |
1422 | kfree(hdr); | |
1423 | ||
1424 | if (ret) | |
1425 | riocm_error("ch(%d) send CLOSE failed (ret=%d)", ch->id, ret); | |
1426 | ||
1427 | return ret; | |
1428 | } | |
1429 | ||
1430 | /* | |
1431 | * riocm_ch_close - closes a channel object with specified ID (by local request) | |
1432 | * @ch: channel to be closed | |
1433 | */ | |
1434 | static int riocm_ch_close(struct rio_channel *ch) | |
1435 | { | |
1436 | unsigned long tmo = msecs_to_jiffies(3000); | |
1437 | enum rio_cm_state state; | |
1438 | long wret; | |
1439 | int ret = 0; | |
1440 | ||
1441 | riocm_debug(CHOP, "ch_%d by %s(%d)", | |
1442 | ch->id, current->comm, task_pid_nr(current)); | |
1443 | ||
1444 | state = riocm_exch(ch, RIO_CM_DESTROYING); | |
1445 | if (state == RIO_CM_CONNECTED) | |
1446 | riocm_send_close(ch); | |
1447 | ||
1448 | complete_all(&ch->comp); | |
1449 | ||
1450 | riocm_put_channel(ch); | |
1451 | wret = wait_for_completion_interruptible_timeout(&ch->comp_close, tmo); | |
1452 | ||
1453 | riocm_debug(WAIT, "wait on %d returns %ld", ch->id, wret); | |
1454 | ||
1455 | if (wret == 0) { | |
1456 | /* Timeout on wait occurred */ | |
1457 | riocm_debug(CHOP, "%s(%d) timed out waiting for ch %d", | |
1458 | current->comm, task_pid_nr(current), ch->id); | |
1459 | ret = -ETIMEDOUT; | |
1460 | } else if (wret == -ERESTARTSYS) { | |
1461 | /* Wait_for_completion was interrupted by a signal */ | |
1462 | riocm_debug(CHOP, "%s(%d) wait for ch %d was interrupted", | |
1463 | current->comm, task_pid_nr(current), ch->id); | |
1464 | ret = -EINTR; | |
1465 | } | |
1466 | ||
1467 | if (!ret) { | |
1468 | riocm_debug(CHOP, "ch_%d resources released", ch->id); | |
1469 | kfree(ch); | |
1470 | } else { | |
1471 | riocm_debug(CHOP, "failed to release ch_%d resources", ch->id); | |
1472 | } | |
1473 | ||
1474 | return ret; | |
1475 | } | |
1476 | ||
1477 | /* | |
1478 | * riocm_cdev_open() - Open character device | |
1479 | */ | |
1480 | static int riocm_cdev_open(struct inode *inode, struct file *filp) | |
1481 | { | |
1482 | riocm_debug(INIT, "by %s(%d) filp=%p ", | |
1483 | current->comm, task_pid_nr(current), filp); | |
1484 | ||
1485 | if (list_empty(&cm_dev_list)) | |
1486 | return -ENODEV; | |
1487 | ||
1488 | return 0; | |
1489 | } | |
1490 | ||
1491 | /* | |
1492 | * riocm_cdev_release() - Release character device | |
1493 | */ | |
1494 | static int riocm_cdev_release(struct inode *inode, struct file *filp) | |
1495 | { | |
1496 | struct rio_channel *ch, *_c; | |
1497 | unsigned int i; | |
1498 | LIST_HEAD(list); | |
1499 | ||
1500 | riocm_debug(EXIT, "by %s(%d) filp=%p", | |
1501 | current->comm, task_pid_nr(current), filp); | |
1502 | ||
1503 | /* Check if there are channels associated with this file descriptor */ | |
1504 | spin_lock_bh(&idr_lock); | |
1505 | idr_for_each_entry(&ch_idr, ch, i) { | |
1506 | if (ch && ch->filp == filp) { | |
1507 | riocm_debug(EXIT, "ch_%d not released by %s(%d)", | |
1508 | ch->id, current->comm, | |
1509 | task_pid_nr(current)); | |
1510 | idr_remove(&ch_idr, ch->id); | |
1511 | list_add(&ch->ch_node, &list); | |
1512 | } | |
1513 | } | |
1514 | spin_unlock_bh(&idr_lock); | |
1515 | ||
1516 | if (!list_empty(&list)) { | |
1517 | list_for_each_entry_safe(ch, _c, &list, ch_node) { | |
1518 | list_del(&ch->ch_node); | |
1519 | riocm_ch_close(ch); | |
1520 | } | |
1521 | } | |
1522 | ||
1523 | return 0; | |
1524 | } | |
1525 | ||
1526 | /* | |
1527 | * cm_ep_get_list_size() - Reports number of endpoints in the network | |
1528 | */ | |
1529 | static int cm_ep_get_list_size(void __user *arg) | |
1530 | { | |
1531 | u32 __user *p = arg; | |
1532 | u32 mport_id; | |
1533 | u32 count = 0; | |
1534 | struct cm_dev *cm; | |
1535 | ||
1536 | if (get_user(mport_id, p)) | |
1537 | return -EFAULT; | |
1538 | if (mport_id >= RIO_MAX_MPORTS) | |
1539 | return -EINVAL; | |
1540 | ||
1541 | /* Find a matching cm_dev object */ | |
1542 | down_read(&rdev_sem); | |
1543 | list_for_each_entry(cm, &cm_dev_list, list) { | |
1544 | if (cm->mport->id == mport_id) { | |
1545 | count = cm->npeers; | |
1546 | up_read(&rdev_sem); | |
1547 | if (copy_to_user(arg, &count, sizeof(u32))) | |
1548 | return -EFAULT; | |
1549 | return 0; | |
1550 | } | |
1551 | } | |
1552 | up_read(&rdev_sem); | |
1553 | ||
1554 | return -ENODEV; | |
1555 | } | |
1556 | ||
1557 | /* | |
1558 | * cm_ep_get_list() - Returns list of attached endpoints | |
1559 | */ | |
1560 | static int cm_ep_get_list(void __user *arg) | |
1561 | { | |
1562 | struct cm_dev *cm; | |
1563 | struct cm_peer *peer; | |
1564 | u32 info[2]; | |
1565 | void *buf; | |
1566 | u32 nent; | |
1567 | u32 *entry_ptr; | |
1568 | u32 i = 0; | |
1569 | int ret = 0; | |
1570 | ||
1571 | if (copy_from_user(&info, arg, sizeof(info))) | |
1572 | return -EFAULT; | |
1573 | ||
1574 | if (info[1] >= RIO_MAX_MPORTS || info[0] > RIOCM_MAX_EP_COUNT) | |
1575 | return -EINVAL; | |
1576 | ||
1577 | /* Find a matching cm_dev object */ | |
1578 | down_read(&rdev_sem); | |
1579 | list_for_each_entry(cm, &cm_dev_list, list) | |
1580 | if (cm->mport->id == (u8)info[1]) | |
1581 | goto found; | |
1582 | ||
1583 | up_read(&rdev_sem); | |
1584 | return -ENODEV; | |
1585 | ||
1586 | found: | |
1587 | nent = min(info[0], cm->npeers); | |
1588 | buf = kcalloc(nent + 2, sizeof(u32), GFP_KERNEL); | |
1589 | if (!buf) { | |
1590 | up_read(&rdev_sem); | |
1591 | return -ENOMEM; | |
1592 | } | |
1593 | ||
1594 | entry_ptr = (u32 *)((uintptr_t)buf + 2*sizeof(u32)); | |
1595 | ||
1596 | list_for_each_entry(peer, &cm->peers, node) { | |
1597 | *entry_ptr = (u32)peer->rdev->destid; | |
1598 | entry_ptr++; | |
1599 | if (++i == nent) | |
1600 | break; | |
1601 | } | |
1602 | up_read(&rdev_sem); | |
1603 | ||
1604 | ((u32 *)buf)[0] = i; /* report an updated number of entries */ | |
1605 | ((u32 *)buf)[1] = info[1]; /* put back an mport ID */ | |
1606 | if (copy_to_user(arg, buf, sizeof(u32) * (info[0] + 2))) | |
1607 | ret = -EFAULT; | |
1608 | ||
1609 | kfree(buf); | |
1610 | return ret; | |
1611 | } | |
1612 | ||
1613 | /* | |
1614 | * cm_mport_get_list() - Returns list of available local mport devices | |
1615 | */ | |
1616 | static int cm_mport_get_list(void __user *arg) | |
1617 | { | |
1618 | int ret = 0; | |
1619 | u32 entries; | |
1620 | void *buf; | |
1621 | struct cm_dev *cm; | |
1622 | u32 *entry_ptr; | |
1623 | int count = 0; | |
1624 | ||
1625 | if (copy_from_user(&entries, arg, sizeof(entries))) | |
1626 | return -EFAULT; | |
1627 | if (entries == 0 || entries > RIO_MAX_MPORTS) | |
1628 | return -EINVAL; | |
1629 | buf = kcalloc(entries + 1, sizeof(u32), GFP_KERNEL); | |
1630 | if (!buf) | |
1631 | return -ENOMEM; | |
1632 | ||
1633 | /* Scan all registered cm_dev objects */ | |
1634 | entry_ptr = (u32 *)((uintptr_t)buf + sizeof(u32)); | |
1635 | down_read(&rdev_sem); | |
1636 | list_for_each_entry(cm, &cm_dev_list, list) { | |
1637 | if (count++ < entries) { | |
1638 | *entry_ptr = (cm->mport->id << 16) | | |
1639 | cm->mport->host_deviceid; | |
1640 | entry_ptr++; | |
1641 | } | |
1642 | } | |
1643 | up_read(&rdev_sem); | |
1644 | ||
1645 | *((u32 *)buf) = count; /* report a real number of entries */ | |
1646 | if (copy_to_user(arg, buf, sizeof(u32) * (count + 1))) | |
1647 | ret = -EFAULT; | |
1648 | ||
1649 | kfree(buf); | |
1650 | return ret; | |
1651 | } | |
1652 | ||
1653 | /* | |
1654 | * cm_chan_create() - Create a message exchange channel | |
1655 | */ | |
1656 | static int cm_chan_create(struct file *filp, void __user *arg) | |
1657 | { | |
1658 | u16 __user *p = arg; | |
1659 | u16 ch_num; | |
1660 | struct rio_channel *ch; | |
1661 | ||
1662 | if (get_user(ch_num, p)) | |
1663 | return -EFAULT; | |
1664 | ||
1665 | riocm_debug(CHOP, "ch_%d requested by %s(%d)", | |
1666 | ch_num, current->comm, task_pid_nr(current)); | |
1667 | ch = riocm_ch_create(&ch_num); | |
1668 | if (IS_ERR(ch)) | |
1669 | return PTR_ERR(ch); | |
1670 | ||
1671 | ch->filp = filp; | |
1672 | riocm_debug(CHOP, "ch_%d created by %s(%d)", | |
1673 | ch_num, current->comm, task_pid_nr(current)); | |
1674 | return put_user(ch_num, p); | |
1675 | } | |
1676 | ||
1677 | /* | |
1678 | * cm_chan_close() - Close channel | |
1679 | * @filp: Pointer to file object | |
1680 | * @arg: Channel to close | |
1681 | */ | |
1682 | static int cm_chan_close(struct file *filp, void __user *arg) | |
1683 | { | |
1684 | u16 __user *p = arg; | |
1685 | u16 ch_num; | |
1686 | struct rio_channel *ch; | |
1687 | ||
1688 | if (get_user(ch_num, p)) | |
1689 | return -EFAULT; | |
1690 | ||
1691 | riocm_debug(CHOP, "ch_%d by %s(%d)", | |
1692 | ch_num, current->comm, task_pid_nr(current)); | |
1693 | ||
1694 | spin_lock_bh(&idr_lock); | |
1695 | ch = idr_find(&ch_idr, ch_num); | |
1696 | if (!ch) { | |
1697 | spin_unlock_bh(&idr_lock); | |
1698 | return 0; | |
1699 | } | |
1700 | if (ch->filp != filp) { | |
1701 | spin_unlock_bh(&idr_lock); | |
1702 | return -EINVAL; | |
1703 | } | |
1704 | idr_remove(&ch_idr, ch->id); | |
1705 | spin_unlock_bh(&idr_lock); | |
1706 | ||
1707 | return riocm_ch_close(ch); | |
1708 | } | |
1709 | ||
1710 | /* | |
1711 | * cm_chan_bind() - Bind channel | |
1712 | * @arg: Channel number | |
1713 | */ | |
1714 | static int cm_chan_bind(void __user *arg) | |
1715 | { | |
1716 | struct rio_cm_channel chan; | |
1717 | ||
1718 | if (copy_from_user(&chan, arg, sizeof(chan))) | |
1719 | return -EFAULT; | |
1720 | if (chan.mport_id >= RIO_MAX_MPORTS) | |
1721 | return -EINVAL; | |
1722 | ||
1723 | return riocm_ch_bind(chan.id, chan.mport_id, NULL); | |
1724 | } | |
1725 | ||
1726 | /* | |
1727 | * cm_chan_listen() - Listen on channel | |
1728 | * @arg: Channel number | |
1729 | */ | |
1730 | static int cm_chan_listen(void __user *arg) | |
1731 | { | |
1732 | u16 __user *p = arg; | |
1733 | u16 ch_num; | |
1734 | ||
1735 | if (get_user(ch_num, p)) | |
1736 | return -EFAULT; | |
1737 | ||
1738 | return riocm_ch_listen(ch_num); | |
1739 | } | |
1740 | ||
1741 | /* | |
1742 | * cm_chan_accept() - Accept incoming connection | |
1743 | * @filp: Pointer to file object | |
1744 | * @arg: Channel number | |
1745 | */ | |
1746 | static int cm_chan_accept(struct file *filp, void __user *arg) | |
1747 | { | |
1748 | struct rio_cm_accept param; | |
1749 | long accept_to; | |
1750 | struct rio_channel *ch; | |
1751 | ||
1752 | if (copy_from_user(¶m, arg, sizeof(param))) | |
1753 | return -EFAULT; | |
1754 | ||
1755 | riocm_debug(CHOP, "on ch_%d by %s(%d)", | |
1756 | param.ch_num, current->comm, task_pid_nr(current)); | |
1757 | ||
1758 | accept_to = param.wait_to ? | |
1759 | msecs_to_jiffies(param.wait_to) : 0; | |
1760 | ||
1761 | ch = riocm_ch_accept(param.ch_num, ¶m.ch_num, accept_to); | |
1762 | if (IS_ERR(ch)) | |
1763 | return PTR_ERR(ch); | |
1764 | ch->filp = filp; | |
1765 | ||
1766 | riocm_debug(CHOP, "new ch_%d for %s(%d)", | |
1767 | ch->id, current->comm, task_pid_nr(current)); | |
1768 | ||
1769 | if (copy_to_user(arg, ¶m, sizeof(param))) | |
1770 | return -EFAULT; | |
1771 | return 0; | |
1772 | } | |
1773 | ||
1774 | /* | |
1775 | * cm_chan_connect() - Connect on channel | |
1776 | * @arg: Channel information | |
1777 | */ | |
1778 | static int cm_chan_connect(void __user *arg) | |
1779 | { | |
1780 | struct rio_cm_channel chan; | |
1781 | struct cm_dev *cm; | |
1782 | struct cm_peer *peer; | |
1783 | int ret = -ENODEV; | |
1784 | ||
1785 | if (copy_from_user(&chan, arg, sizeof(chan))) | |
1786 | return -EFAULT; | |
1787 | if (chan.mport_id >= RIO_MAX_MPORTS) | |
1788 | return -EINVAL; | |
1789 | ||
1790 | down_read(&rdev_sem); | |
1791 | ||
1792 | /* Find matching cm_dev object */ | |
1793 | list_for_each_entry(cm, &cm_dev_list, list) { | |
1794 | if (cm->mport->id == chan.mport_id) { | |
1795 | ret = 0; | |
1796 | break; | |
1797 | } | |
1798 | } | |
1799 | ||
1800 | if (ret) | |
1801 | goto err_out; | |
1802 | ||
1803 | if (chan.remote_destid >= RIO_ANY_DESTID(cm->mport->sys_size)) { | |
1804 | ret = -EINVAL; | |
1805 | goto err_out; | |
1806 | } | |
1807 | ||
1808 | /* Find corresponding RapidIO endpoint device object */ | |
1809 | ret = -ENODEV; | |
1810 | ||
1811 | list_for_each_entry(peer, &cm->peers, node) { | |
1812 | if (peer->rdev->destid == chan.remote_destid) { | |
1813 | ret = 0; | |
1814 | break; | |
1815 | } | |
1816 | } | |
1817 | ||
1818 | if (ret) | |
1819 | goto err_out; | |
1820 | ||
1821 | up_read(&rdev_sem); | |
1822 | ||
1823 | return riocm_ch_connect(chan.id, cm, peer, chan.remote_channel); | |
1824 | err_out: | |
1825 | up_read(&rdev_sem); | |
1826 | return ret; | |
1827 | } | |
1828 | ||
1829 | /* | |
1830 | * cm_chan_msg_send() - Send a message through channel | |
1831 | * @arg: Outbound message information | |
1832 | */ | |
1833 | static int cm_chan_msg_send(void __user *arg) | |
1834 | { | |
1835 | struct rio_cm_msg msg; | |
1836 | void *buf; | |
7836a2d9 | 1837 | int ret; |
b6e8d4aa AB |
1838 | |
1839 | if (copy_from_user(&msg, arg, sizeof(msg))) | |
1840 | return -EFAULT; | |
1841 | if (msg.size > RIO_MAX_MSG_SIZE) | |
1842 | return -EINVAL; | |
1843 | ||
7836a2d9 AB |
1844 | buf = memdup_user((void __user *)(uintptr_t)msg.msg, msg.size); |
1845 | if (IS_ERR(buf)) | |
1846 | return PTR_ERR(buf); | |
b6e8d4aa AB |
1847 | |
1848 | ret = riocm_ch_send(msg.ch_num, buf, msg.size); | |
7836a2d9 | 1849 | |
b6e8d4aa AB |
1850 | kfree(buf); |
1851 | return ret; | |
1852 | } | |
1853 | ||
1854 | /* | |
1855 | * cm_chan_msg_rcv() - Receive a message through channel | |
1856 | * @arg: Inbound message information | |
1857 | */ | |
1858 | static int cm_chan_msg_rcv(void __user *arg) | |
1859 | { | |
1860 | struct rio_cm_msg msg; | |
1861 | struct rio_channel *ch; | |
1862 | void *buf; | |
1863 | long rxto; | |
1864 | int ret = 0, msg_size; | |
1865 | ||
1866 | if (copy_from_user(&msg, arg, sizeof(msg))) | |
1867 | return -EFAULT; | |
1868 | ||
1869 | if (msg.ch_num == 0 || msg.size == 0) | |
1870 | return -EINVAL; | |
1871 | ||
1872 | ch = riocm_get_channel(msg.ch_num); | |
1873 | if (!ch) | |
1874 | return -ENODEV; | |
1875 | ||
1876 | rxto = msg.rxto ? msecs_to_jiffies(msg.rxto) : MAX_SCHEDULE_TIMEOUT; | |
1877 | ||
1878 | ret = riocm_ch_receive(ch, &buf, rxto); | |
1879 | if (ret) | |
1880 | goto out; | |
1881 | ||
1882 | msg_size = min(msg.size, (u16)(RIO_MAX_MSG_SIZE)); | |
1883 | ||
1884 | if (copy_to_user((void __user *)(uintptr_t)msg.msg, buf, msg_size)) | |
1885 | ret = -EFAULT; | |
1886 | ||
1887 | riocm_ch_free_rxbuf(ch, buf); | |
1888 | out: | |
1889 | riocm_put_channel(ch); | |
1890 | return ret; | |
1891 | } | |
1892 | ||
1893 | /* | |
1894 | * riocm_cdev_ioctl() - IOCTL requests handler | |
1895 | */ | |
1896 | static long | |
1897 | riocm_cdev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1898 | { | |
1899 | switch (cmd) { | |
1900 | case RIO_CM_EP_GET_LIST_SIZE: | |
1901 | return cm_ep_get_list_size((void __user *)arg); | |
1902 | case RIO_CM_EP_GET_LIST: | |
1903 | return cm_ep_get_list((void __user *)arg); | |
1904 | case RIO_CM_CHAN_CREATE: | |
1905 | return cm_chan_create(filp, (void __user *)arg); | |
1906 | case RIO_CM_CHAN_CLOSE: | |
1907 | return cm_chan_close(filp, (void __user *)arg); | |
1908 | case RIO_CM_CHAN_BIND: | |
1909 | return cm_chan_bind((void __user *)arg); | |
1910 | case RIO_CM_CHAN_LISTEN: | |
1911 | return cm_chan_listen((void __user *)arg); | |
1912 | case RIO_CM_CHAN_ACCEPT: | |
1913 | return cm_chan_accept(filp, (void __user *)arg); | |
1914 | case RIO_CM_CHAN_CONNECT: | |
1915 | return cm_chan_connect((void __user *)arg); | |
1916 | case RIO_CM_CHAN_SEND: | |
1917 | return cm_chan_msg_send((void __user *)arg); | |
1918 | case RIO_CM_CHAN_RECEIVE: | |
1919 | return cm_chan_msg_rcv((void __user *)arg); | |
1920 | case RIO_CM_MPORT_GET_LIST: | |
1921 | return cm_mport_get_list((void __user *)arg); | |
1922 | default: | |
1923 | break; | |
1924 | } | |
1925 | ||
1926 | return -EINVAL; | |
1927 | } | |
1928 | ||
1929 | static const struct file_operations riocm_cdev_fops = { | |
1930 | .owner = THIS_MODULE, | |
1931 | .open = riocm_cdev_open, | |
1932 | .release = riocm_cdev_release, | |
1933 | .unlocked_ioctl = riocm_cdev_ioctl, | |
1934 | }; | |
1935 | ||
1936 | /* | |
1937 | * riocm_add_dev - add new remote RapidIO device into channel management core | |
1938 | * @dev: device object associated with RapidIO device | |
1939 | * @sif: subsystem interface | |
1940 | * | |
1941 | * Adds the specified RapidIO device (if applicable) into peers list of | |
1942 | * the corresponding channel management device (cm_dev). | |
1943 | */ | |
1944 | static int riocm_add_dev(struct device *dev, struct subsys_interface *sif) | |
1945 | { | |
1946 | struct cm_peer *peer; | |
1947 | struct rio_dev *rdev = to_rio_dev(dev); | |
1948 | struct cm_dev *cm; | |
1949 | ||
1950 | /* Check if the remote device has capabilities required to support CM */ | |
1951 | if (!dev_cm_capable(rdev)) | |
1952 | return 0; | |
1953 | ||
1954 | riocm_debug(RDEV, "(%s)", rio_name(rdev)); | |
1955 | ||
1956 | peer = kmalloc(sizeof(*peer), GFP_KERNEL); | |
1957 | if (!peer) | |
1958 | return -ENOMEM; | |
1959 | ||
1960 | /* Find a corresponding cm_dev object */ | |
1961 | down_write(&rdev_sem); | |
1962 | list_for_each_entry(cm, &cm_dev_list, list) { | |
1963 | if (cm->mport == rdev->net->hport) | |
1964 | goto found; | |
1965 | } | |
1966 | ||
1967 | up_write(&rdev_sem); | |
1968 | kfree(peer); | |
1969 | return -ENODEV; | |
1970 | ||
1971 | found: | |
1972 | peer->rdev = rdev; | |
1973 | list_add_tail(&peer->node, &cm->peers); | |
1974 | cm->npeers++; | |
1975 | ||
1976 | up_write(&rdev_sem); | |
1977 | return 0; | |
1978 | } | |
1979 | ||
1980 | /* | |
1981 | * riocm_remove_dev - remove remote RapidIO device from channel management core | |
1982 | * @dev: device object associated with RapidIO device | |
1983 | * @sif: subsystem interface | |
1984 | * | |
1985 | * Removes the specified RapidIO device (if applicable) from peers list of | |
1986 | * the corresponding channel management device (cm_dev). | |
1987 | */ | |
1988 | static void riocm_remove_dev(struct device *dev, struct subsys_interface *sif) | |
1989 | { | |
1990 | struct rio_dev *rdev = to_rio_dev(dev); | |
1991 | struct cm_dev *cm; | |
1992 | struct cm_peer *peer; | |
1993 | struct rio_channel *ch, *_c; | |
1994 | unsigned int i; | |
1995 | bool found = false; | |
1996 | LIST_HEAD(list); | |
1997 | ||
1998 | /* Check if the remote device has capabilities required to support CM */ | |
1999 | if (!dev_cm_capable(rdev)) | |
2000 | return; | |
2001 | ||
2002 | riocm_debug(RDEV, "(%s)", rio_name(rdev)); | |
2003 | ||
2004 | /* Find matching cm_dev object */ | |
2005 | down_write(&rdev_sem); | |
2006 | list_for_each_entry(cm, &cm_dev_list, list) { | |
2007 | if (cm->mport == rdev->net->hport) { | |
2008 | found = true; | |
2009 | break; | |
2010 | } | |
2011 | } | |
2012 | ||
2013 | if (!found) { | |
2014 | up_write(&rdev_sem); | |
2015 | return; | |
2016 | } | |
2017 | ||
2018 | /* Remove remote device from the list of peers */ | |
2019 | found = false; | |
2020 | list_for_each_entry(peer, &cm->peers, node) { | |
2021 | if (peer->rdev == rdev) { | |
2022 | riocm_debug(RDEV, "removing peer %s", rio_name(rdev)); | |
2023 | found = true; | |
2024 | list_del(&peer->node); | |
2025 | cm->npeers--; | |
2026 | kfree(peer); | |
2027 | break; | |
2028 | } | |
2029 | } | |
2030 | ||
2031 | up_write(&rdev_sem); | |
2032 | ||
2033 | if (!found) | |
2034 | return; | |
2035 | ||
2036 | /* | |
2037 | * Release channels associated with this peer | |
2038 | */ | |
2039 | ||
2040 | spin_lock_bh(&idr_lock); | |
2041 | idr_for_each_entry(&ch_idr, ch, i) { | |
2042 | if (ch && ch->rdev == rdev) { | |
2043 | if (atomic_read(&rdev->state) != RIO_DEVICE_SHUTDOWN) | |
2044 | riocm_exch(ch, RIO_CM_DISCONNECT); | |
2045 | idr_remove(&ch_idr, ch->id); | |
2046 | list_add(&ch->ch_node, &list); | |
2047 | } | |
2048 | } | |
2049 | spin_unlock_bh(&idr_lock); | |
2050 | ||
2051 | if (!list_empty(&list)) { | |
2052 | list_for_each_entry_safe(ch, _c, &list, ch_node) { | |
2053 | list_del(&ch->ch_node); | |
2054 | riocm_ch_close(ch); | |
2055 | } | |
2056 | } | |
2057 | } | |
2058 | ||
2059 | /* | |
2060 | * riocm_cdev_add() - Create rio_cm char device | |
2061 | * @devno: device number assigned to device (MAJ + MIN) | |
2062 | */ | |
2063 | static int riocm_cdev_add(dev_t devno) | |
2064 | { | |
2065 | int ret; | |
2066 | ||
2067 | cdev_init(&riocm_cdev.cdev, &riocm_cdev_fops); | |
2068 | riocm_cdev.cdev.owner = THIS_MODULE; | |
2069 | ret = cdev_add(&riocm_cdev.cdev, devno, 1); | |
2070 | if (ret < 0) { | |
2071 | riocm_error("Cannot register a device with error %d", ret); | |
2072 | return ret; | |
2073 | } | |
2074 | ||
2075 | riocm_cdev.dev = device_create(dev_class, NULL, devno, NULL, DEV_NAME); | |
2076 | if (IS_ERR(riocm_cdev.dev)) { | |
2077 | cdev_del(&riocm_cdev.cdev); | |
2078 | return PTR_ERR(riocm_cdev.dev); | |
2079 | } | |
2080 | ||
2081 | riocm_debug(MPORT, "Added %s cdev(%d:%d)", | |
2082 | DEV_NAME, MAJOR(devno), MINOR(devno)); | |
2083 | ||
2084 | return 0; | |
2085 | } | |
2086 | ||
2087 | /* | |
2088 | * riocm_add_mport - add new local mport device into channel management core | |
2089 | * @dev: device object associated with mport | |
2090 | * @class_intf: class interface | |
2091 | * | |
2092 | * When a new mport device is added, CM immediately reserves inbound and | |
2093 | * outbound RapidIO mailboxes that will be used. | |
2094 | */ | |
2095 | static int riocm_add_mport(struct device *dev, | |
2096 | struct class_interface *class_intf) | |
2097 | { | |
2098 | int rc; | |
2099 | int i; | |
2100 | struct cm_dev *cm; | |
2101 | struct rio_mport *mport = to_rio_mport(dev); | |
2102 | ||
2103 | riocm_debug(MPORT, "add mport %s", mport->name); | |
2104 | ||
2105 | cm = kzalloc(sizeof(*cm), GFP_KERNEL); | |
2106 | if (!cm) | |
2107 | return -ENOMEM; | |
2108 | ||
2109 | cm->mport = mport; | |
2110 | ||
2111 | rc = rio_request_outb_mbox(mport, cm, cmbox, | |
2112 | RIOCM_TX_RING_SIZE, riocm_outb_msg_event); | |
2113 | if (rc) { | |
2114 | riocm_error("failed to allocate OBMBOX_%d on %s", | |
2115 | cmbox, mport->name); | |
2116 | kfree(cm); | |
2117 | return -ENODEV; | |
2118 | } | |
2119 | ||
2120 | rc = rio_request_inb_mbox(mport, cm, cmbox, | |
2121 | RIOCM_RX_RING_SIZE, riocm_inb_msg_event); | |
2122 | if (rc) { | |
2123 | riocm_error("failed to allocate IBMBOX_%d on %s", | |
2124 | cmbox, mport->name); | |
2125 | rio_release_outb_mbox(mport, cmbox); | |
2126 | kfree(cm); | |
2127 | return -ENODEV; | |
2128 | } | |
2129 | ||
69ce3ae3 AR |
2130 | cm->rx_wq = create_workqueue(DRV_NAME "/rxq"); |
2131 | if (!cm->rx_wq) { | |
2132 | rio_release_inb_mbox(mport, cmbox); | |
2133 | rio_release_outb_mbox(mport, cmbox); | |
2134 | kfree(cm); | |
2135 | return -ENOMEM; | |
2136 | } | |
2137 | ||
b6e8d4aa AB |
2138 | /* |
2139 | * Allocate and register inbound messaging buffers to be ready | |
2140 | * to receive channel and system management requests | |
2141 | */ | |
2142 | for (i = 0; i < RIOCM_RX_RING_SIZE; i++) | |
2143 | cm->rx_buf[i] = NULL; | |
2144 | ||
2145 | cm->rx_slots = RIOCM_RX_RING_SIZE; | |
2146 | mutex_init(&cm->rx_lock); | |
2147 | riocm_rx_fill(cm, RIOCM_RX_RING_SIZE); | |
b6e8d4aa AB |
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; | |
b92ae139 | 2245 | LIST_HEAD(list); |
b6e8d4aa AB |
2246 | |
2247 | riocm_debug(EXIT, "."); | |
2248 | ||
b92ae139 AB |
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 | */ | |
b6e8d4aa AB |
2256 | spin_lock_bh(&idr_lock); |
2257 | idr_for_each_entry(&ch_idr, ch, i) { | |
b92ae139 AB |
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 | } | |
b6e8d4aa AB |
2263 | } |
2264 | spin_unlock_bh(&idr_lock); | |
2265 | ||
b92ae139 AB |
2266 | list_for_each_entry(ch, &list, ch_node) |
2267 | riocm_send_close(ch); | |
2268 | ||
b6e8d4aa AB |
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); |