1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * RapidIO mport character device
4  *
5  * Copyright 2014-2015 Integrated Device Technology, Inc.
6  *    Alexandre Bounine <alexandre.bounine@idt.com>
7  * Copyright 2014-2015 Prodrive Technologies
8  *    Andre van Herk <andre.van.herk@prodrive-technologies.com>
9  *    Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>
10  * Copyright (C) 2014 Texas Instruments Incorporated
11  *    Aurelien Jacquiot <a-jacquiot@ti.com>
12  */
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/cdev.h>
16 #include <linux/ioctl.h>
17 #include <linux/uaccess.h>
18 #include <linux/list.h>
19 #include <linux/fs.h>
20 #include <linux/err.h>
21 #include <linux/net.h>
22 #include <linux/poll.h>
23 #include <linux/spinlock.h>
24 #include <linux/sched.h>
25 #include <linux/kfifo.h>
26 
27 #include <linux/mm.h>
28 #include <linux/slab.h>
29 #include <linux/vmalloc.h>
30 #include <linux/mman.h>
31 
32 #include <linux/dma-mapping.h>
33 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
34 #include <linux/dmaengine.h>
35 #endif
36 
37 #include <linux/rio.h>
38 #include <linux/rio_ids.h>
39 #include <linux/rio_drv.h>
40 #include <linux/rio_mport_cdev.h>
41 
42 #include "../rio.h"
43 
44 #define DRV_NAME	"rio_mport"
45 #define DRV_PREFIX	DRV_NAME ": "
46 #define DEV_NAME	"rio_mport"
47 #define DRV_VERSION     "1.0.0"
48 
49 /* Debug output filtering masks */
50 enum {
51 	DBG_NONE	= 0,
52 	DBG_INIT	= BIT(0), /* driver init */
53 	DBG_EXIT	= BIT(1), /* driver exit */
54 	DBG_MPORT	= BIT(2), /* mport add/remove */
55 	DBG_RDEV	= BIT(3), /* RapidIO device add/remove */
56 	DBG_DMA		= BIT(4), /* DMA transfer messages */
57 	DBG_MMAP	= BIT(5), /* mapping messages */
58 	DBG_IBW		= BIT(6), /* inbound window */
59 	DBG_EVENT	= BIT(7), /* event handling messages */
60 	DBG_OBW		= BIT(8), /* outbound window messages */
61 	DBG_DBELL	= BIT(9), /* doorbell messages */
62 	DBG_ALL		= ~0,
63 };
64 
65 #ifdef DEBUG
66 #define rmcd_debug(level, fmt, arg...)		\
67 	do {					\
68 		if (DBG_##level & dbg_level)	\
69 			pr_debug(DRV_PREFIX "%s: " fmt "\n", __func__, ##arg); \
70 	} while (0)
71 #else
72 #define rmcd_debug(level, fmt, arg...) \
73 		no_printk(KERN_DEBUG pr_fmt(DRV_PREFIX fmt "\n"), ##arg)
74 #endif
75 
76 #define rmcd_warn(fmt, arg...) \
77 	pr_warn(DRV_PREFIX "%s WARNING " fmt "\n", __func__, ##arg)
78 
79 #define rmcd_error(fmt, arg...) \
80 	pr_err(DRV_PREFIX "%s ERROR " fmt "\n", __func__, ##arg)
81 
82 MODULE_AUTHOR("Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>");
83 MODULE_AUTHOR("Aurelien Jacquiot <a-jacquiot@ti.com>");
84 MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>");
85 MODULE_AUTHOR("Andre van Herk <andre.van.herk@prodrive-technologies.com>");
86 MODULE_DESCRIPTION("RapidIO mport character device driver");
87 MODULE_LICENSE("GPL");
88 MODULE_VERSION(DRV_VERSION);
89 
90 static int dma_timeout = 3000; /* DMA transfer timeout in msec */
91 module_param(dma_timeout, int, S_IRUGO);
92 MODULE_PARM_DESC(dma_timeout, "DMA Transfer Timeout in msec (default: 3000)");
93 
94 #ifdef DEBUG
95 static u32 dbg_level = DBG_NONE;
96 module_param(dbg_level, uint, S_IWUSR | S_IWGRP | S_IRUGO);
97 MODULE_PARM_DESC(dbg_level, "Debugging output level (default 0 = none)");
98 #endif
99 
100 /*
101  * An internal DMA coherent buffer
102  */
103 struct mport_dma_buf {
104 	void		*ib_base;
105 	dma_addr_t	ib_phys;
106 	u32		ib_size;
107 	u64		ib_rio_base;
108 	bool		ib_map;
109 	struct file	*filp;
110 };
111 
112 /*
113  * Internal memory mapping structure
114  */
115 enum rio_mport_map_dir {
116 	MAP_INBOUND,
117 	MAP_OUTBOUND,
118 	MAP_DMA,
119 };
120 
121 struct rio_mport_mapping {
122 	struct list_head node;
123 	struct mport_dev *md;
124 	enum rio_mport_map_dir dir;
125 	u16 rioid;
126 	u64 rio_addr;
127 	dma_addr_t phys_addr; /* for mmap */
128 	void *virt_addr; /* kernel address, for dma_free_coherent */
129 	u64 size;
130 	struct kref ref; /* refcount of vmas sharing the mapping */
131 	struct file *filp;
132 };
133 
134 struct rio_mport_dma_map {
135 	int valid;
136 	u64 length;
137 	void *vaddr;
138 	dma_addr_t paddr;
139 };
140 
141 #define MPORT_MAX_DMA_BUFS	16
142 #define MPORT_EVENT_DEPTH	10
143 
144 /*
145  * mport_dev  driver-specific structure that represents mport device
146  * @active    mport device status flag
147  * @node      list node to maintain list of registered mports
148  * @cdev      character device
149  * @dev       associated device object
150  * @mport     associated subsystem's master port device object
151  * @buf_mutex lock for buffer handling
152  * @file_mutex - lock for open files list
153  * @file_list  - list of open files on given mport
154  * @properties properties of this mport
155  * @portwrites queue of inbound portwrites
156  * @pw_lock    lock for port write queue
157  * @mappings   queue for memory mappings
158  * @dma_chan   DMA channels associated with this device
159  * @dma_ref:
160  * @comp:
161  */
162 struct mport_dev {
163 	atomic_t		active;
164 	struct list_head	node;
165 	struct cdev		cdev;
166 	struct device		dev;
167 	struct rio_mport	*mport;
168 	struct mutex		buf_mutex;
169 	struct mutex		file_mutex;
170 	struct list_head	file_list;
171 	struct rio_mport_properties	properties;
172 	struct list_head		doorbells;
173 	spinlock_t			db_lock;
174 	struct list_head		portwrites;
175 	spinlock_t			pw_lock;
176 	struct list_head	mappings;
177 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
178 	struct dma_chan *dma_chan;
179 	struct kref	dma_ref;
180 	struct completion comp;
181 #endif
182 };
183 
184 /*
185  * mport_cdev_priv - data structure specific to individual file object
186  *                   associated with an open device
187  * @md    master port character device object
188  * @async_queue - asynchronous notification queue
189  * @list - file objects tracking list
190  * @db_filters    inbound doorbell filters for this descriptor
191  * @pw_filters    portwrite filters for this descriptor
192  * @event_fifo    event fifo for this descriptor
193  * @event_rx_wait wait queue for this descriptor
194  * @fifo_lock     lock for event_fifo
195  * @event_mask    event mask for this descriptor
196  * @dmach DMA engine channel allocated for specific file object
197  */
198 struct mport_cdev_priv {
199 	struct mport_dev	*md;
200 	struct fasync_struct	*async_queue;
201 	struct list_head	list;
202 	struct list_head	db_filters;
203 	struct list_head        pw_filters;
204 	struct kfifo            event_fifo;
205 	wait_queue_head_t       event_rx_wait;
206 	spinlock_t              fifo_lock;
207 	u32			event_mask; /* RIO_DOORBELL, RIO_PORTWRITE */
208 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
209 	struct dma_chan		*dmach;
210 	struct list_head	async_list;
211 	spinlock_t              req_lock;
212 	struct mutex		dma_lock;
213 	struct kref		dma_ref;
214 	struct completion	comp;
215 #endif
216 };
217 
218 /*
219  * rio_mport_pw_filter - structure to describe a portwrite filter
220  * md_node   node in mport device's list
221  * priv_node node in private file object's list
222  * priv      reference to private data
223  * filter    actual portwrite filter
224  */
225 struct rio_mport_pw_filter {
226 	struct list_head md_node;
227 	struct list_head priv_node;
228 	struct mport_cdev_priv *priv;
229 	struct rio_pw_filter filter;
230 };
231 
232 /*
233  * rio_mport_db_filter - structure to describe a doorbell filter
234  * @data_node reference to device node
235  * @priv_node node in private data
236  * @priv      reference to private data
237  * @filter    actual doorbell filter
238  */
239 struct rio_mport_db_filter {
240 	struct list_head data_node;
241 	struct list_head priv_node;
242 	struct mport_cdev_priv *priv;
243 	struct rio_doorbell_filter filter;
244 };
245 
246 static LIST_HEAD(mport_devs);
247 static DEFINE_MUTEX(mport_devs_lock);
248 
249 #if (0) /* used by commented out portion of poll function : FIXME */
250 static DECLARE_WAIT_QUEUE_HEAD(mport_cdev_wait);
251 #endif
252 
253 static struct class *dev_class;
254 static dev_t dev_number;
255 
256 static void mport_release_mapping(struct kref *ref);
257 
258 static int rio_mport_maint_rd(struct mport_cdev_priv *priv, void __user *arg,
259 			      int local)
260 {
261 	struct rio_mport *mport = priv->md->mport;
262 	struct rio_mport_maint_io maint_io;
263 	u32 *buffer;
264 	u32 offset;
265 	size_t length;
266 	int ret, i;
267 
268 	if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
269 		return -EFAULT;
270 
271 	if ((maint_io.offset % 4) ||
272 	    (maint_io.length == 0) || (maint_io.length % 4) ||
273 	    (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ)
274 		return -EINVAL;
275 
276 	buffer = vmalloc(maint_io.length);
277 	if (buffer == NULL)
278 		return -ENOMEM;
279 	length = maint_io.length/sizeof(u32);
280 	offset = maint_io.offset;
281 
282 	for (i = 0; i < length; i++) {
283 		if (local)
284 			ret = __rio_local_read_config_32(mport,
285 				offset, &buffer[i]);
286 		else
287 			ret = rio_mport_read_config_32(mport, maint_io.rioid,
288 				maint_io.hopcount, offset, &buffer[i]);
289 		if (ret)
290 			goto out;
291 
292 		offset += 4;
293 	}
294 
295 	if (unlikely(copy_to_user((void __user *)(uintptr_t)maint_io.buffer,
296 				   buffer, maint_io.length)))
297 		ret = -EFAULT;
298 out:
299 	vfree(buffer);
300 	return ret;
301 }
302 
303 static int rio_mport_maint_wr(struct mport_cdev_priv *priv, void __user *arg,
304 			      int local)
305 {
306 	struct rio_mport *mport = priv->md->mport;
307 	struct rio_mport_maint_io maint_io;
308 	u32 *buffer;
309 	u32 offset;
310 	size_t length;
311 	int ret = -EINVAL, i;
312 
313 	if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
314 		return -EFAULT;
315 
316 	if ((maint_io.offset % 4) ||
317 	    (maint_io.length == 0) || (maint_io.length % 4) ||
318 	    (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ)
319 		return -EINVAL;
320 
321 	buffer = vmalloc(maint_io.length);
322 	if (buffer == NULL)
323 		return -ENOMEM;
324 	length = maint_io.length;
325 
326 	if (unlikely(copy_from_user(buffer,
327 			(void __user *)(uintptr_t)maint_io.buffer, length))) {
328 		ret = -EFAULT;
329 		goto out;
330 	}
331 
332 	offset = maint_io.offset;
333 	length /= sizeof(u32);
334 
335 	for (i = 0; i < length; i++) {
336 		if (local)
337 			ret = __rio_local_write_config_32(mport,
338 							  offset, buffer[i]);
339 		else
340 			ret = rio_mport_write_config_32(mport, maint_io.rioid,
341 							maint_io.hopcount,
342 							offset, buffer[i]);
343 		if (ret)
344 			goto out;
345 
346 		offset += 4;
347 	}
348 
349 out:
350 	vfree(buffer);
351 	return ret;
352 }
353 
354 
355 /*
356  * Inbound/outbound memory mapping functions
357  */
358 static int
359 rio_mport_create_outbound_mapping(struct mport_dev *md, struct file *filp,
360 				  u16 rioid, u64 raddr, u32 size,
361 				  dma_addr_t *paddr)
362 {
363 	struct rio_mport *mport = md->mport;
364 	struct rio_mport_mapping *map;
365 	int ret;
366 
367 	rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%x", rioid, raddr, size);
368 
369 	map = kzalloc(sizeof(*map), GFP_KERNEL);
370 	if (map == NULL)
371 		return -ENOMEM;
372 
373 	ret = rio_map_outb_region(mport, rioid, raddr, size, 0, paddr);
374 	if (ret < 0)
375 		goto err_map_outb;
376 
377 	map->dir = MAP_OUTBOUND;
378 	map->rioid = rioid;
379 	map->rio_addr = raddr;
380 	map->size = size;
381 	map->phys_addr = *paddr;
382 	map->filp = filp;
383 	map->md = md;
384 	kref_init(&map->ref);
385 	list_add_tail(&map->node, &md->mappings);
386 	return 0;
387 err_map_outb:
388 	kfree(map);
389 	return ret;
390 }
391 
392 static int
393 rio_mport_get_outbound_mapping(struct mport_dev *md, struct file *filp,
394 			       u16 rioid, u64 raddr, u32 size,
395 			       dma_addr_t *paddr)
396 {
397 	struct rio_mport_mapping *map;
398 	int err = -ENOMEM;
399 
400 	mutex_lock(&md->buf_mutex);
401 	list_for_each_entry(map, &md->mappings, node) {
402 		if (map->dir != MAP_OUTBOUND)
403 			continue;
404 		if (rioid == map->rioid &&
405 		    raddr == map->rio_addr && size == map->size) {
406 			*paddr = map->phys_addr;
407 			err = 0;
408 			break;
409 		} else if (rioid == map->rioid &&
410 			   raddr < (map->rio_addr + map->size - 1) &&
411 			   (raddr + size) > map->rio_addr) {
412 			err = -EBUSY;
413 			break;
414 		}
415 	}
416 
417 	/* If not found, create new */
418 	if (err == -ENOMEM)
419 		err = rio_mport_create_outbound_mapping(md, filp, rioid, raddr,
420 						size, paddr);
421 	mutex_unlock(&md->buf_mutex);
422 	return err;
423 }
424 
425 static int rio_mport_obw_map(struct file *filp, void __user *arg)
426 {
427 	struct mport_cdev_priv *priv = filp->private_data;
428 	struct mport_dev *data = priv->md;
429 	struct rio_mmap map;
430 	dma_addr_t paddr;
431 	int ret;
432 
433 	if (unlikely(copy_from_user(&map, arg, sizeof(map))))
434 		return -EFAULT;
435 
436 	rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%llx",
437 		   map.rioid, map.rio_addr, map.length);
438 
439 	ret = rio_mport_get_outbound_mapping(data, filp, map.rioid,
440 					     map.rio_addr, map.length, &paddr);
441 	if (ret < 0) {
442 		rmcd_error("Failed to set OBW err= %d", ret);
443 		return ret;
444 	}
445 
446 	map.handle = paddr;
447 
448 	if (unlikely(copy_to_user(arg, &map, sizeof(map))))
449 		return -EFAULT;
450 	return 0;
451 }
452 
453 /*
454  * rio_mport_obw_free() - unmap an OutBound Window from RapidIO address space
455  *
456  * @priv: driver private data
457  * @arg:  buffer handle returned by allocation routine
458  */
459 static int rio_mport_obw_free(struct file *filp, void __user *arg)
460 {
461 	struct mport_cdev_priv *priv = filp->private_data;
462 	struct mport_dev *md = priv->md;
463 	u64 handle;
464 	struct rio_mport_mapping *map, *_map;
465 
466 	if (!md->mport->ops->unmap_outb)
467 		return -EPROTONOSUPPORT;
468 
469 	if (copy_from_user(&handle, arg, sizeof(handle)))
470 		return -EFAULT;
471 
472 	rmcd_debug(OBW, "h=0x%llx", handle);
473 
474 	mutex_lock(&md->buf_mutex);
475 	list_for_each_entry_safe(map, _map, &md->mappings, node) {
476 		if (map->dir == MAP_OUTBOUND && map->phys_addr == handle) {
477 			if (map->filp == filp) {
478 				rmcd_debug(OBW, "kref_put h=0x%llx", handle);
479 				map->filp = NULL;
480 				kref_put(&map->ref, mport_release_mapping);
481 			}
482 			break;
483 		}
484 	}
485 	mutex_unlock(&md->buf_mutex);
486 
487 	return 0;
488 }
489 
490 /*
491  * maint_hdid_set() - Set the host Device ID
492  * @priv: driver private data
493  * @arg:	Device Id
494  */
495 static int maint_hdid_set(struct mport_cdev_priv *priv, void __user *arg)
496 {
497 	struct mport_dev *md = priv->md;
498 	u16 hdid;
499 
500 	if (copy_from_user(&hdid, arg, sizeof(hdid)))
501 		return -EFAULT;
502 
503 	md->mport->host_deviceid = hdid;
504 	md->properties.hdid = hdid;
505 	rio_local_set_device_id(md->mport, hdid);
506 
507 	rmcd_debug(MPORT, "Set host device Id to %d", hdid);
508 
509 	return 0;
510 }
511 
512 /*
513  * maint_comptag_set() - Set the host Component Tag
514  * @priv: driver private data
515  * @arg:	Component Tag
516  */
517 static int maint_comptag_set(struct mport_cdev_priv *priv, void __user *arg)
518 {
519 	struct mport_dev *md = priv->md;
520 	u32 comptag;
521 
522 	if (copy_from_user(&comptag, arg, sizeof(comptag)))
523 		return -EFAULT;
524 
525 	rio_local_write_config_32(md->mport, RIO_COMPONENT_TAG_CSR, comptag);
526 
527 	rmcd_debug(MPORT, "Set host Component Tag to %d", comptag);
528 
529 	return 0;
530 }
531 
532 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
533 
534 struct mport_dma_req {
535 	struct kref refcount;
536 	struct list_head node;
537 	struct file *filp;
538 	struct mport_cdev_priv *priv;
539 	enum rio_transfer_sync sync;
540 	struct sg_table sgt;
541 	struct page **page_list;
542 	unsigned int nr_pages;
543 	struct rio_mport_mapping *map;
544 	struct dma_chan *dmach;
545 	enum dma_data_direction dir;
546 	dma_cookie_t cookie;
547 	enum dma_status	status;
548 	struct completion req_comp;
549 };
550 
551 static void mport_release_def_dma(struct kref *dma_ref)
552 {
553 	struct mport_dev *md =
554 			container_of(dma_ref, struct mport_dev, dma_ref);
555 
556 	rmcd_debug(EXIT, "DMA_%d", md->dma_chan->chan_id);
557 	rio_release_dma(md->dma_chan);
558 	md->dma_chan = NULL;
559 }
560 
561 static void mport_release_dma(struct kref *dma_ref)
562 {
563 	struct mport_cdev_priv *priv =
564 			container_of(dma_ref, struct mport_cdev_priv, dma_ref);
565 
566 	rmcd_debug(EXIT, "DMA_%d", priv->dmach->chan_id);
567 	complete(&priv->comp);
568 }
569 
570 static void dma_req_free(struct kref *ref)
571 {
572 	struct mport_dma_req *req = container_of(ref, struct mport_dma_req,
573 			refcount);
574 	struct mport_cdev_priv *priv = req->priv;
575 
576 	dma_unmap_sg(req->dmach->device->dev,
577 		     req->sgt.sgl, req->sgt.nents, req->dir);
578 	sg_free_table(&req->sgt);
579 	if (req->page_list) {
580 		unpin_user_pages(req->page_list, req->nr_pages);
581 		kfree(req->page_list);
582 	}
583 
584 	if (req->map) {
585 		mutex_lock(&req->map->md->buf_mutex);
586 		kref_put(&req->map->ref, mport_release_mapping);
587 		mutex_unlock(&req->map->md->buf_mutex);
588 	}
589 
590 	kref_put(&priv->dma_ref, mport_release_dma);
591 
592 	kfree(req);
593 }
594 
595 static void dma_xfer_callback(void *param)
596 {
597 	struct mport_dma_req *req = (struct mport_dma_req *)param;
598 	struct mport_cdev_priv *priv = req->priv;
599 
600 	req->status = dma_async_is_tx_complete(priv->dmach, req->cookie,
601 					       NULL, NULL);
602 	complete(&req->req_comp);
603 	kref_put(&req->refcount, dma_req_free);
604 }
605 
606 /*
607  * prep_dma_xfer() - Configure and send request to DMAengine to prepare DMA
608  *                   transfer object.
609  * Returns pointer to DMA transaction descriptor allocated by DMA driver on
610  * success or ERR_PTR (and/or NULL) if failed. Caller must check returned
611  * non-NULL pointer using IS_ERR macro.
612  */
613 static struct dma_async_tx_descriptor
614 *prep_dma_xfer(struct dma_chan *chan, struct rio_transfer_io *transfer,
615 	struct sg_table *sgt, int nents, enum dma_transfer_direction dir,
616 	enum dma_ctrl_flags flags)
617 {
618 	struct rio_dma_data tx_data;
619 
620 	tx_data.sg = sgt->sgl;
621 	tx_data.sg_len = nents;
622 	tx_data.rio_addr_u = 0;
623 	tx_data.rio_addr = transfer->rio_addr;
624 	if (dir == DMA_MEM_TO_DEV) {
625 		switch (transfer->method) {
626 		case RIO_EXCHANGE_NWRITE:
627 			tx_data.wr_type = RDW_ALL_NWRITE;
628 			break;
629 		case RIO_EXCHANGE_NWRITE_R_ALL:
630 			tx_data.wr_type = RDW_ALL_NWRITE_R;
631 			break;
632 		case RIO_EXCHANGE_NWRITE_R:
633 			tx_data.wr_type = RDW_LAST_NWRITE_R;
634 			break;
635 		case RIO_EXCHANGE_DEFAULT:
636 			tx_data.wr_type = RDW_DEFAULT;
637 			break;
638 		default:
639 			return ERR_PTR(-EINVAL);
640 		}
641 	}
642 
643 	return rio_dma_prep_xfer(chan, transfer->rioid, &tx_data, dir, flags);
644 }
645 
646 /* Request DMA channel associated with this mport device.
647  * Try to request DMA channel for every new process that opened given
648  * mport. If a new DMA channel is not available use default channel
649  * which is the first DMA channel opened on mport device.
650  */
651 static int get_dma_channel(struct mport_cdev_priv *priv)
652 {
653 	mutex_lock(&priv->dma_lock);
654 	if (!priv->dmach) {
655 		priv->dmach = rio_request_mport_dma(priv->md->mport);
656 		if (!priv->dmach) {
657 			/* Use default DMA channel if available */
658 			if (priv->md->dma_chan) {
659 				priv->dmach = priv->md->dma_chan;
660 				kref_get(&priv->md->dma_ref);
661 			} else {
662 				rmcd_error("Failed to get DMA channel");
663 				mutex_unlock(&priv->dma_lock);
664 				return -ENODEV;
665 			}
666 		} else if (!priv->md->dma_chan) {
667 			/* Register default DMA channel if we do not have one */
668 			priv->md->dma_chan = priv->dmach;
669 			kref_init(&priv->md->dma_ref);
670 			rmcd_debug(DMA, "Register DMA_chan %d as default",
671 				   priv->dmach->chan_id);
672 		}
673 
674 		kref_init(&priv->dma_ref);
675 		init_completion(&priv->comp);
676 	}
677 
678 	kref_get(&priv->dma_ref);
679 	mutex_unlock(&priv->dma_lock);
680 	return 0;
681 }
682 
683 static void put_dma_channel(struct mport_cdev_priv *priv)
684 {
685 	kref_put(&priv->dma_ref, mport_release_dma);
686 }
687 
688 /*
689  * DMA transfer functions
690  */
691 static int do_dma_request(struct mport_dma_req *req,
692 			  struct rio_transfer_io *xfer,
693 			  enum rio_transfer_sync sync, int nents)
694 {
695 	struct mport_cdev_priv *priv;
696 	struct sg_table *sgt;
697 	struct dma_chan *chan;
698 	struct dma_async_tx_descriptor *tx;
699 	dma_cookie_t cookie;
700 	unsigned long tmo = msecs_to_jiffies(dma_timeout);
701 	enum dma_transfer_direction dir;
702 	long wret;
703 	int ret = 0;
704 
705 	priv = req->priv;
706 	sgt = &req->sgt;
707 
708 	chan = priv->dmach;
709 	dir = (req->dir == DMA_FROM_DEVICE) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
710 
711 	rmcd_debug(DMA, "%s(%d) uses %s for DMA_%s",
712 		   current->comm, task_pid_nr(current),
713 		   dev_name(&chan->dev->device),
714 		   (dir == DMA_DEV_TO_MEM)?"READ":"WRITE");
715 
716 	/* Initialize DMA transaction request */
717 	tx = prep_dma_xfer(chan, xfer, sgt, nents, dir,
718 			   DMA_CTRL_ACK | DMA_PREP_INTERRUPT);
719 
720 	if (!tx) {
721 		rmcd_debug(DMA, "prep error for %s A:0x%llx L:0x%llx",
722 			(dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
723 			xfer->rio_addr, xfer->length);
724 		ret = -EIO;
725 		goto err_out;
726 	} else if (IS_ERR(tx)) {
727 		ret = PTR_ERR(tx);
728 		rmcd_debug(DMA, "prep error %d for %s A:0x%llx L:0x%llx", ret,
729 			(dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
730 			xfer->rio_addr, xfer->length);
731 		goto err_out;
732 	}
733 
734 	tx->callback = dma_xfer_callback;
735 	tx->callback_param = req;
736 
737 	req->status = DMA_IN_PROGRESS;
738 	kref_get(&req->refcount);
739 
740 	cookie = dmaengine_submit(tx);
741 	req->cookie = cookie;
742 
743 	rmcd_debug(DMA, "pid=%d DMA_%s tx_cookie = %d", task_pid_nr(current),
744 		   (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
745 
746 	if (dma_submit_error(cookie)) {
747 		rmcd_error("submit err=%d (addr:0x%llx len:0x%llx)",
748 			   cookie, xfer->rio_addr, xfer->length);
749 		kref_put(&req->refcount, dma_req_free);
750 		ret = -EIO;
751 		goto err_out;
752 	}
753 
754 	dma_async_issue_pending(chan);
755 
756 	if (sync == RIO_TRANSFER_ASYNC) {
757 		spin_lock(&priv->req_lock);
758 		list_add_tail(&req->node, &priv->async_list);
759 		spin_unlock(&priv->req_lock);
760 		return cookie;
761 	} else if (sync == RIO_TRANSFER_FAF)
762 		return 0;
763 
764 	wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);
765 
766 	if (wret == 0) {
767 		/* Timeout on wait occurred */
768 		rmcd_error("%s(%d) timed out waiting for DMA_%s %d",
769 		       current->comm, task_pid_nr(current),
770 		       (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
771 		return -ETIMEDOUT;
772 	} else if (wret == -ERESTARTSYS) {
773 		/* Wait_for_completion was interrupted by a signal but DMA may
774 		 * be in progress
775 		 */
776 		rmcd_error("%s(%d) wait for DMA_%s %d was interrupted",
777 			current->comm, task_pid_nr(current),
778 			(dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
779 		return -EINTR;
780 	}
781 
782 	if (req->status != DMA_COMPLETE) {
783 		/* DMA transaction completion was signaled with error */
784 		rmcd_error("%s(%d) DMA_%s %d completed with status %d (ret=%d)",
785 			current->comm, task_pid_nr(current),
786 			(dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
787 			cookie, req->status, ret);
788 		ret = -EIO;
789 	}
790 
791 err_out:
792 	return ret;
793 }
794 
795 /*
796  * rio_dma_transfer() - Perform RapidIO DMA data transfer to/from
797  *                      the remote RapidIO device
798  * @filp: file pointer associated with the call
799  * @transfer_mode: DMA transfer mode
800  * @sync: synchronization mode
801  * @dir: DMA transfer direction (DMA_MEM_TO_DEV = write OR
802  *                               DMA_DEV_TO_MEM = read)
803  * @xfer: data transfer descriptor structure
804  */
805 static int
806 rio_dma_transfer(struct file *filp, u32 transfer_mode,
807 		 enum rio_transfer_sync sync, enum dma_data_direction dir,
808 		 struct rio_transfer_io *xfer)
809 {
810 	struct mport_cdev_priv *priv = filp->private_data;
811 	unsigned long nr_pages = 0;
812 	struct page **page_list = NULL;
813 	struct mport_dma_req *req;
814 	struct mport_dev *md = priv->md;
815 	struct dma_chan *chan;
816 	int ret;
817 	int nents;
818 
819 	if (xfer->length == 0)
820 		return -EINVAL;
821 	req = kzalloc(sizeof(*req), GFP_KERNEL);
822 	if (!req)
823 		return -ENOMEM;
824 
825 	ret = get_dma_channel(priv);
826 	if (ret) {
827 		kfree(req);
828 		return ret;
829 	}
830 	chan = priv->dmach;
831 
832 	kref_init(&req->refcount);
833 	init_completion(&req->req_comp);
834 	req->dir = dir;
835 	req->filp = filp;
836 	req->priv = priv;
837 	req->dmach = chan;
838 	req->sync = sync;
839 
840 	/*
841 	 * If parameter loc_addr != NULL, we are transferring data from/to
842 	 * data buffer allocated in user-space: lock in memory user-space
843 	 * buffer pages and build an SG table for DMA transfer request
844 	 *
845 	 * Otherwise (loc_addr == NULL) contiguous kernel-space buffer is
846 	 * used for DMA data transfers: build single entry SG table using
847 	 * offset within the internal buffer specified by handle parameter.
848 	 */
849 	if (xfer->loc_addr) {
850 		unsigned int offset;
851 		long pinned;
852 
853 		offset = lower_32_bits(offset_in_page(xfer->loc_addr));
854 		nr_pages = PAGE_ALIGN(xfer->length + offset) >> PAGE_SHIFT;
855 
856 		page_list = kmalloc_array(nr_pages,
857 					  sizeof(*page_list), GFP_KERNEL);
858 		if (page_list == NULL) {
859 			ret = -ENOMEM;
860 			goto err_req;
861 		}
862 
863 		pinned = pin_user_pages_fast(
864 				(unsigned long)xfer->loc_addr & PAGE_MASK,
865 				nr_pages,
866 				dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0,
867 				page_list);
868 
869 		if (pinned != nr_pages) {
870 			if (pinned < 0) {
871 				rmcd_error("pin_user_pages_fast err=%ld",
872 					   pinned);
873 				nr_pages = 0;
874 			} else
875 				rmcd_error("pinned %ld out of %ld pages",
876 					   pinned, nr_pages);
877 			ret = -EFAULT;
878 			/*
879 			 * Set nr_pages up to mean "how many pages to unpin, in
880 			 * the error handler:
881 			 */
882 			nr_pages = pinned;
883 			goto err_pg;
884 		}
885 
886 		ret = sg_alloc_table_from_pages(&req->sgt, page_list, nr_pages,
887 					offset, xfer->length, GFP_KERNEL);
888 		if (ret) {
889 			rmcd_error("sg_alloc_table failed with err=%d", ret);
890 			goto err_pg;
891 		}
892 
893 		req->page_list = page_list;
894 		req->nr_pages = nr_pages;
895 	} else {
896 		dma_addr_t baddr;
897 		struct rio_mport_mapping *map;
898 
899 		baddr = (dma_addr_t)xfer->handle;
900 
901 		mutex_lock(&md->buf_mutex);
902 		list_for_each_entry(map, &md->mappings, node) {
903 			if (baddr >= map->phys_addr &&
904 			    baddr < (map->phys_addr + map->size)) {
905 				kref_get(&map->ref);
906 				req->map = map;
907 				break;
908 			}
909 		}
910 		mutex_unlock(&md->buf_mutex);
911 
912 		if (req->map == NULL) {
913 			ret = -ENOMEM;
914 			goto err_req;
915 		}
916 
917 		if (xfer->length + xfer->offset > map->size) {
918 			ret = -EINVAL;
919 			goto err_req;
920 		}
921 
922 		ret = sg_alloc_table(&req->sgt, 1, GFP_KERNEL);
923 		if (unlikely(ret)) {
924 			rmcd_error("sg_alloc_table failed for internal buf");
925 			goto err_req;
926 		}
927 
928 		sg_set_buf(req->sgt.sgl,
929 			   map->virt_addr + (baddr - map->phys_addr) +
930 				xfer->offset, xfer->length);
931 	}
932 
933 	nents = dma_map_sg(chan->device->dev,
934 			   req->sgt.sgl, req->sgt.nents, dir);
935 	if (nents == 0) {
936 		rmcd_error("Failed to map SG list");
937 		ret = -EFAULT;
938 		goto err_pg;
939 	}
940 
941 	ret = do_dma_request(req, xfer, sync, nents);
942 
943 	if (ret >= 0) {
944 		if (sync == RIO_TRANSFER_ASYNC)
945 			return ret; /* return ASYNC cookie */
946 	} else {
947 		rmcd_debug(DMA, "do_dma_request failed with err=%d", ret);
948 	}
949 
950 err_pg:
951 	if (!req->page_list) {
952 		unpin_user_pages(page_list, nr_pages);
953 		kfree(page_list);
954 	}
955 err_req:
956 	kref_put(&req->refcount, dma_req_free);
957 	return ret;
958 }
959 
960 static int rio_mport_transfer_ioctl(struct file *filp, void __user *arg)
961 {
962 	struct mport_cdev_priv *priv = filp->private_data;
963 	struct rio_transaction transaction;
964 	struct rio_transfer_io *transfer;
965 	enum dma_data_direction dir;
966 	int i, ret = 0;
967 
968 	if (unlikely(copy_from_user(&transaction, arg, sizeof(transaction))))
969 		return -EFAULT;
970 
971 	if (transaction.count != 1) /* only single transfer for now */
972 		return -EINVAL;
973 
974 	if ((transaction.transfer_mode &
975 	     priv->md->properties.transfer_mode) == 0)
976 		return -ENODEV;
977 
978 	transfer = vmalloc(array_size(sizeof(*transfer), transaction.count));
979 	if (!transfer)
980 		return -ENOMEM;
981 
982 	if (unlikely(copy_from_user(transfer,
983 				    (void __user *)(uintptr_t)transaction.block,
984 				    transaction.count * sizeof(*transfer)))) {
985 		ret = -EFAULT;
986 		goto out_free;
987 	}
988 
989 	dir = (transaction.dir == RIO_TRANSFER_DIR_READ) ?
990 					DMA_FROM_DEVICE : DMA_TO_DEVICE;
991 	for (i = 0; i < transaction.count && ret == 0; i++)
992 		ret = rio_dma_transfer(filp, transaction.transfer_mode,
993 			transaction.sync, dir, &transfer[i]);
994 
995 	if (unlikely(copy_to_user((void __user *)(uintptr_t)transaction.block,
996 				  transfer,
997 				  transaction.count * sizeof(*transfer))))
998 		ret = -EFAULT;
999 
1000 out_free:
1001 	vfree(transfer);
1002 
1003 	return ret;
1004 }
1005 
1006 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1007 {
1008 	struct mport_cdev_priv *priv;
1009 	struct rio_async_tx_wait w_param;
1010 	struct mport_dma_req *req;
1011 	dma_cookie_t cookie;
1012 	unsigned long tmo;
1013 	long wret;
1014 	int found = 0;
1015 	int ret;
1016 
1017 	priv = (struct mport_cdev_priv *)filp->private_data;
1018 
1019 	if (unlikely(copy_from_user(&w_param, arg, sizeof(w_param))))
1020 		return -EFAULT;
1021 
1022 	cookie = w_param.token;
1023 	if (w_param.timeout)
1024 		tmo = msecs_to_jiffies(w_param.timeout);
1025 	else /* Use default DMA timeout */
1026 		tmo = msecs_to_jiffies(dma_timeout);
1027 
1028 	spin_lock(&priv->req_lock);
1029 	list_for_each_entry(req, &priv->async_list, node) {
1030 		if (req->cookie == cookie) {
1031 			list_del(&req->node);
1032 			found = 1;
1033 			break;
1034 		}
1035 	}
1036 	spin_unlock(&priv->req_lock);
1037 
1038 	if (!found)
1039 		return -EAGAIN;
1040 
1041 	wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);
1042 
1043 	if (wret == 0) {
1044 		/* Timeout on wait occurred */
1045 		rmcd_error("%s(%d) timed out waiting for ASYNC DMA_%s",
1046 		       current->comm, task_pid_nr(current),
1047 		       (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
1048 		ret = -ETIMEDOUT;
1049 		goto err_tmo;
1050 	} else if (wret == -ERESTARTSYS) {
1051 		/* Wait_for_completion was interrupted by a signal but DMA may
1052 		 * be still in progress
1053 		 */
1054 		rmcd_error("%s(%d) wait for ASYNC DMA_%s was interrupted",
1055 			current->comm, task_pid_nr(current),
1056 			(req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
1057 		ret = -EINTR;
1058 		goto err_tmo;
1059 	}
1060 
1061 	if (req->status != DMA_COMPLETE) {
1062 		/* DMA transaction completion signaled with transfer error */
1063 		rmcd_error("%s(%d) ASYNC DMA_%s completion with status %d",
1064 			current->comm, task_pid_nr(current),
1065 			(req->dir == DMA_FROM_DEVICE)?"READ":"WRITE",
1066 			req->status);
1067 		ret = -EIO;
1068 	} else
1069 		ret = 0;
1070 
1071 	if (req->status != DMA_IN_PROGRESS && req->status != DMA_PAUSED)
1072 		kref_put(&req->refcount, dma_req_free);
1073 
1074 	return ret;
1075 
1076 err_tmo:
1077 	/* Return request back into async queue */
1078 	spin_lock(&priv->req_lock);
1079 	list_add_tail(&req->node, &priv->async_list);
1080 	spin_unlock(&priv->req_lock);
1081 	return ret;
1082 }
1083 
1084 static int rio_mport_create_dma_mapping(struct mport_dev *md, struct file *filp,
1085 			u64 size, struct rio_mport_mapping **mapping)
1086 {
1087 	struct rio_mport_mapping *map;
1088 
1089 	map = kzalloc(sizeof(*map), GFP_KERNEL);
1090 	if (map == NULL)
1091 		return -ENOMEM;
1092 
1093 	map->virt_addr = dma_alloc_coherent(md->mport->dev.parent, size,
1094 					    &map->phys_addr, GFP_KERNEL);
1095 	if (map->virt_addr == NULL) {
1096 		kfree(map);
1097 		return -ENOMEM;
1098 	}
1099 
1100 	map->dir = MAP_DMA;
1101 	map->size = size;
1102 	map->filp = filp;
1103 	map->md = md;
1104 	kref_init(&map->ref);
1105 	mutex_lock(&md->buf_mutex);
1106 	list_add_tail(&map->node, &md->mappings);
1107 	mutex_unlock(&md->buf_mutex);
1108 	*mapping = map;
1109 
1110 	return 0;
1111 }
1112 
1113 static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1114 {
1115 	struct mport_cdev_priv *priv = filp->private_data;
1116 	struct mport_dev *md = priv->md;
1117 	struct rio_dma_mem map;
1118 	struct rio_mport_mapping *mapping = NULL;
1119 	int ret;
1120 
1121 	if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1122 		return -EFAULT;
1123 
1124 	ret = rio_mport_create_dma_mapping(md, filp, map.length, &mapping);
1125 	if (ret)
1126 		return ret;
1127 
1128 	map.dma_handle = mapping->phys_addr;
1129 
1130 	if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1131 		mutex_lock(&md->buf_mutex);
1132 		kref_put(&mapping->ref, mport_release_mapping);
1133 		mutex_unlock(&md->buf_mutex);
1134 		return -EFAULT;
1135 	}
1136 
1137 	return 0;
1138 }
1139 
1140 static int rio_mport_free_dma(struct file *filp, void __user *arg)
1141 {
1142 	struct mport_cdev_priv *priv = filp->private_data;
1143 	struct mport_dev *md = priv->md;
1144 	u64 handle;
1145 	int ret = -EFAULT;
1146 	struct rio_mport_mapping *map, *_map;
1147 
1148 	if (copy_from_user(&handle, arg, sizeof(handle)))
1149 		return -EFAULT;
1150 	rmcd_debug(EXIT, "filp=%p", filp);
1151 
1152 	mutex_lock(&md->buf_mutex);
1153 	list_for_each_entry_safe(map, _map, &md->mappings, node) {
1154 		if (map->dir == MAP_DMA && map->phys_addr == handle &&
1155 		    map->filp == filp) {
1156 			kref_put(&map->ref, mport_release_mapping);
1157 			ret = 0;
1158 			break;
1159 		}
1160 	}
1161 	mutex_unlock(&md->buf_mutex);
1162 
1163 	if (ret == -EFAULT) {
1164 		rmcd_debug(DMA, "ERR no matching mapping");
1165 		return ret;
1166 	}
1167 
1168 	return 0;
1169 }
1170 #else
1171 static int rio_mport_transfer_ioctl(struct file *filp, void *arg)
1172 {
1173 	return -ENODEV;
1174 }
1175 
1176 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1177 {
1178 	return -ENODEV;
1179 }
1180 
1181 static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1182 {
1183 	return -ENODEV;
1184 }
1185 
1186 static int rio_mport_free_dma(struct file *filp, void __user *arg)
1187 {
1188 	return -ENODEV;
1189 }
1190 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1191 
1192 /*
1193  * Inbound/outbound memory mapping functions
1194  */
1195 
1196 static int
1197 rio_mport_create_inbound_mapping(struct mport_dev *md, struct file *filp,
1198 				u64 raddr, u64 size,
1199 				struct rio_mport_mapping **mapping)
1200 {
1201 	struct rio_mport *mport = md->mport;
1202 	struct rio_mport_mapping *map;
1203 	int ret;
1204 
1205 	/* rio_map_inb_region() accepts u32 size */
1206 	if (size > 0xffffffff)
1207 		return -EINVAL;
1208 
1209 	map = kzalloc(sizeof(*map), GFP_KERNEL);
1210 	if (map == NULL)
1211 		return -ENOMEM;
1212 
1213 	map->virt_addr = dma_alloc_coherent(mport->dev.parent, size,
1214 					    &map->phys_addr, GFP_KERNEL);
1215 	if (map->virt_addr == NULL) {
1216 		ret = -ENOMEM;
1217 		goto err_dma_alloc;
1218 	}
1219 
1220 	if (raddr == RIO_MAP_ANY_ADDR)
1221 		raddr = map->phys_addr;
1222 	ret = rio_map_inb_region(mport, map->phys_addr, raddr, (u32)size, 0);
1223 	if (ret < 0)
1224 		goto err_map_inb;
1225 
1226 	map->dir = MAP_INBOUND;
1227 	map->rio_addr = raddr;
1228 	map->size = size;
1229 	map->filp = filp;
1230 	map->md = md;
1231 	kref_init(&map->ref);
1232 	mutex_lock(&md->buf_mutex);
1233 	list_add_tail(&map->node, &md->mappings);
1234 	mutex_unlock(&md->buf_mutex);
1235 	*mapping = map;
1236 	return 0;
1237 
1238 err_map_inb:
1239 	dma_free_coherent(mport->dev.parent, size,
1240 			  map->virt_addr, map->phys_addr);
1241 err_dma_alloc:
1242 	kfree(map);
1243 	return ret;
1244 }
1245 
1246 static int
1247 rio_mport_get_inbound_mapping(struct mport_dev *md, struct file *filp,
1248 			      u64 raddr, u64 size,
1249 			      struct rio_mport_mapping **mapping)
1250 {
1251 	struct rio_mport_mapping *map;
1252 	int err = -ENOMEM;
1253 
1254 	if (raddr == RIO_MAP_ANY_ADDR)
1255 		goto get_new;
1256 
1257 	mutex_lock(&md->buf_mutex);
1258 	list_for_each_entry(map, &md->mappings, node) {
1259 		if (map->dir != MAP_INBOUND)
1260 			continue;
1261 		if (raddr == map->rio_addr && size == map->size) {
1262 			/* allow exact match only */
1263 			*mapping = map;
1264 			err = 0;
1265 			break;
1266 		} else if (raddr < (map->rio_addr + map->size - 1) &&
1267 			   (raddr + size) > map->rio_addr) {
1268 			err = -EBUSY;
1269 			break;
1270 		}
1271 	}
1272 	mutex_unlock(&md->buf_mutex);
1273 
1274 	if (err != -ENOMEM)
1275 		return err;
1276 get_new:
1277 	/* not found, create new */
1278 	return rio_mport_create_inbound_mapping(md, filp, raddr, size, mapping);
1279 }
1280 
1281 static int rio_mport_map_inbound(struct file *filp, void __user *arg)
1282 {
1283 	struct mport_cdev_priv *priv = filp->private_data;
1284 	struct mport_dev *md = priv->md;
1285 	struct rio_mmap map;
1286 	struct rio_mport_mapping *mapping = NULL;
1287 	int ret;
1288 
1289 	if (!md->mport->ops->map_inb)
1290 		return -EPROTONOSUPPORT;
1291 	if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1292 		return -EFAULT;
1293 
1294 	rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1295 
1296 	ret = rio_mport_get_inbound_mapping(md, filp, map.rio_addr,
1297 					    map.length, &mapping);
1298 	if (ret)
1299 		return ret;
1300 
1301 	map.handle = mapping->phys_addr;
1302 	map.rio_addr = mapping->rio_addr;
1303 
1304 	if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1305 		/* Delete mapping if it was created by this request */
1306 		if (ret == 0 && mapping->filp == filp) {
1307 			mutex_lock(&md->buf_mutex);
1308 			kref_put(&mapping->ref, mport_release_mapping);
1309 			mutex_unlock(&md->buf_mutex);
1310 		}
1311 		return -EFAULT;
1312 	}
1313 
1314 	return 0;
1315 }
1316 
1317 /*
1318  * rio_mport_inbound_free() - unmap from RapidIO address space and free
1319  *                    previously allocated inbound DMA coherent buffer
1320  * @priv: driver private data
1321  * @arg:  buffer handle returned by allocation routine
1322  */
1323 static int rio_mport_inbound_free(struct file *filp, void __user *arg)
1324 {
1325 	struct mport_cdev_priv *priv = filp->private_data;
1326 	struct mport_dev *md = priv->md;
1327 	u64 handle;
1328 	struct rio_mport_mapping *map, *_map;
1329 
1330 	rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1331 
1332 	if (!md->mport->ops->unmap_inb)
1333 		return -EPROTONOSUPPORT;
1334 
1335 	if (copy_from_user(&handle, arg, sizeof(handle)))
1336 		return -EFAULT;
1337 
1338 	mutex_lock(&md->buf_mutex);
1339 	list_for_each_entry_safe(map, _map, &md->mappings, node) {
1340 		if (map->dir == MAP_INBOUND && map->phys_addr == handle) {
1341 			if (map->filp == filp) {
1342 				map->filp = NULL;
1343 				kref_put(&map->ref, mport_release_mapping);
1344 			}
1345 			break;
1346 		}
1347 	}
1348 	mutex_unlock(&md->buf_mutex);
1349 
1350 	return 0;
1351 }
1352 
1353 /*
1354  * maint_port_idx_get() - Get the port index of the mport instance
1355  * @priv: driver private data
1356  * @arg:  port index
1357  */
1358 static int maint_port_idx_get(struct mport_cdev_priv *priv, void __user *arg)
1359 {
1360 	struct mport_dev *md = priv->md;
1361 	u32 port_idx = md->mport->index;
1362 
1363 	rmcd_debug(MPORT, "port_index=%d", port_idx);
1364 
1365 	if (copy_to_user(arg, &port_idx, sizeof(port_idx)))
1366 		return -EFAULT;
1367 
1368 	return 0;
1369 }
1370 
1371 static int rio_mport_add_event(struct mport_cdev_priv *priv,
1372 			       struct rio_event *event)
1373 {
1374 	int overflow;
1375 
1376 	if (!(priv->event_mask & event->header))
1377 		return -EACCES;
1378 
1379 	spin_lock(&priv->fifo_lock);
1380 	overflow = kfifo_avail(&priv->event_fifo) < sizeof(*event)
1381 		|| kfifo_in(&priv->event_fifo, (unsigned char *)event,
1382 			sizeof(*event)) != sizeof(*event);
1383 	spin_unlock(&priv->fifo_lock);
1384 
1385 	wake_up_interruptible(&priv->event_rx_wait);
1386 
1387 	if (overflow) {
1388 		dev_warn(&priv->md->dev, DRV_NAME ": event fifo overflow\n");
1389 		return -EBUSY;
1390 	}
1391 
1392 	return 0;
1393 }
1394 
1395 static void rio_mport_doorbell_handler(struct rio_mport *mport, void *dev_id,
1396 				       u16 src, u16 dst, u16 info)
1397 {
1398 	struct mport_dev *data = dev_id;
1399 	struct mport_cdev_priv *priv;
1400 	struct rio_mport_db_filter *db_filter;
1401 	struct rio_event event;
1402 	int handled;
1403 
1404 	event.header = RIO_DOORBELL;
1405 	event.u.doorbell.rioid = src;
1406 	event.u.doorbell.payload = info;
1407 
1408 	handled = 0;
1409 	spin_lock(&data->db_lock);
1410 	list_for_each_entry(db_filter, &data->doorbells, data_node) {
1411 		if (((db_filter->filter.rioid == RIO_INVALID_DESTID ||
1412 		      db_filter->filter.rioid == src)) &&
1413 		      info >= db_filter->filter.low &&
1414 		      info <= db_filter->filter.high) {
1415 			priv = db_filter->priv;
1416 			rio_mport_add_event(priv, &event);
1417 			handled = 1;
1418 		}
1419 	}
1420 	spin_unlock(&data->db_lock);
1421 
1422 	if (!handled)
1423 		dev_warn(&data->dev,
1424 			"%s: spurious DB received from 0x%x, info=0x%04x\n",
1425 			__func__, src, info);
1426 }
1427 
1428 static int rio_mport_add_db_filter(struct mport_cdev_priv *priv,
1429 				   void __user *arg)
1430 {
1431 	struct mport_dev *md = priv->md;
1432 	struct rio_mport_db_filter *db_filter;
1433 	struct rio_doorbell_filter filter;
1434 	unsigned long flags;
1435 	int ret;
1436 
1437 	if (copy_from_user(&filter, arg, sizeof(filter)))
1438 		return -EFAULT;
1439 
1440 	if (filter.low > filter.high)
1441 		return -EINVAL;
1442 
1443 	ret = rio_request_inb_dbell(md->mport, md, filter.low, filter.high,
1444 				    rio_mport_doorbell_handler);
1445 	if (ret) {
1446 		rmcd_error("%s failed to register IBDB, err=%d",
1447 			   dev_name(&md->dev), ret);
1448 		return ret;
1449 	}
1450 
1451 	db_filter = kzalloc(sizeof(*db_filter), GFP_KERNEL);
1452 	if (db_filter == NULL) {
1453 		rio_release_inb_dbell(md->mport, filter.low, filter.high);
1454 		return -ENOMEM;
1455 	}
1456 
1457 	db_filter->filter = filter;
1458 	db_filter->priv = priv;
1459 	spin_lock_irqsave(&md->db_lock, flags);
1460 	list_add_tail(&db_filter->priv_node, &priv->db_filters);
1461 	list_add_tail(&db_filter->data_node, &md->doorbells);
1462 	spin_unlock_irqrestore(&md->db_lock, flags);
1463 
1464 	return 0;
1465 }
1466 
1467 static void rio_mport_delete_db_filter(struct rio_mport_db_filter *db_filter)
1468 {
1469 	list_del(&db_filter->data_node);
1470 	list_del(&db_filter->priv_node);
1471 	kfree(db_filter);
1472 }
1473 
1474 static int rio_mport_remove_db_filter(struct mport_cdev_priv *priv,
1475 				      void __user *arg)
1476 {
1477 	struct rio_mport_db_filter *db_filter;
1478 	struct rio_doorbell_filter filter;
1479 	unsigned long flags;
1480 	int ret = -EINVAL;
1481 
1482 	if (copy_from_user(&filter, arg, sizeof(filter)))
1483 		return -EFAULT;
1484 
1485 	if (filter.low > filter.high)
1486 		return -EINVAL;
1487 
1488 	spin_lock_irqsave(&priv->md->db_lock, flags);
1489 	list_for_each_entry(db_filter, &priv->db_filters, priv_node) {
1490 		if (db_filter->filter.rioid == filter.rioid &&
1491 		    db_filter->filter.low == filter.low &&
1492 		    db_filter->filter.high == filter.high) {
1493 			rio_mport_delete_db_filter(db_filter);
1494 			ret = 0;
1495 			break;
1496 		}
1497 	}
1498 	spin_unlock_irqrestore(&priv->md->db_lock, flags);
1499 
1500 	if (!ret)
1501 		rio_release_inb_dbell(priv->md->mport, filter.low, filter.high);
1502 
1503 	return ret;
1504 }
1505 
1506 static int rio_mport_match_pw(union rio_pw_msg *msg,
1507 			      struct rio_pw_filter *filter)
1508 {
1509 	if ((msg->em.comptag & filter->mask) < filter->low ||
1510 		(msg->em.comptag & filter->mask) > filter->high)
1511 		return 0;
1512 	return 1;
1513 }
1514 
1515 static int rio_mport_pw_handler(struct rio_mport *mport, void *context,
1516 				union rio_pw_msg *msg, int step)
1517 {
1518 	struct mport_dev *md = context;
1519 	struct mport_cdev_priv *priv;
1520 	struct rio_mport_pw_filter *pw_filter;
1521 	struct rio_event event;
1522 	int handled;
1523 
1524 	event.header = RIO_PORTWRITE;
1525 	memcpy(event.u.portwrite.payload, msg->raw, RIO_PW_MSG_SIZE);
1526 
1527 	handled = 0;
1528 	spin_lock(&md->pw_lock);
1529 	list_for_each_entry(pw_filter, &md->portwrites, md_node) {
1530 		if (rio_mport_match_pw(msg, &pw_filter->filter)) {
1531 			priv = pw_filter->priv;
1532 			rio_mport_add_event(priv, &event);
1533 			handled = 1;
1534 		}
1535 	}
1536 	spin_unlock(&md->pw_lock);
1537 
1538 	if (!handled) {
1539 		printk_ratelimited(KERN_WARNING DRV_NAME
1540 			": mport%d received spurious PW from 0x%08x\n",
1541 			mport->id, msg->em.comptag);
1542 	}
1543 
1544 	return 0;
1545 }
1546 
1547 static int rio_mport_add_pw_filter(struct mport_cdev_priv *priv,
1548 				   void __user *arg)
1549 {
1550 	struct mport_dev *md = priv->md;
1551 	struct rio_mport_pw_filter *pw_filter;
1552 	struct rio_pw_filter filter;
1553 	unsigned long flags;
1554 	int hadd = 0;
1555 
1556 	if (copy_from_user(&filter, arg, sizeof(filter)))
1557 		return -EFAULT;
1558 
1559 	pw_filter = kzalloc(sizeof(*pw_filter), GFP_KERNEL);
1560 	if (pw_filter == NULL)
1561 		return -ENOMEM;
1562 
1563 	pw_filter->filter = filter;
1564 	pw_filter->priv = priv;
1565 	spin_lock_irqsave(&md->pw_lock, flags);
1566 	if (list_empty(&md->portwrites))
1567 		hadd = 1;
1568 	list_add_tail(&pw_filter->priv_node, &priv->pw_filters);
1569 	list_add_tail(&pw_filter->md_node, &md->portwrites);
1570 	spin_unlock_irqrestore(&md->pw_lock, flags);
1571 
1572 	if (hadd) {
1573 		int ret;
1574 
1575 		ret = rio_add_mport_pw_handler(md->mport, md,
1576 					       rio_mport_pw_handler);
1577 		if (ret) {
1578 			dev_err(&md->dev,
1579 				"%s: failed to add IB_PW handler, err=%d\n",
1580 				__func__, ret);
1581 			return ret;
1582 		}
1583 		rio_pw_enable(md->mport, 1);
1584 	}
1585 
1586 	return 0;
1587 }
1588 
1589 static void rio_mport_delete_pw_filter(struct rio_mport_pw_filter *pw_filter)
1590 {
1591 	list_del(&pw_filter->md_node);
1592 	list_del(&pw_filter->priv_node);
1593 	kfree(pw_filter);
1594 }
1595 
1596 static int rio_mport_match_pw_filter(struct rio_pw_filter *a,
1597 				     struct rio_pw_filter *b)
1598 {
1599 	if ((a->mask == b->mask) && (a->low == b->low) && (a->high == b->high))
1600 		return 1;
1601 	return 0;
1602 }
1603 
1604 static int rio_mport_remove_pw_filter(struct mport_cdev_priv *priv,
1605 				      void __user *arg)
1606 {
1607 	struct mport_dev *md = priv->md;
1608 	struct rio_mport_pw_filter *pw_filter;
1609 	struct rio_pw_filter filter;
1610 	unsigned long flags;
1611 	int ret = -EINVAL;
1612 	int hdel = 0;
1613 
1614 	if (copy_from_user(&filter, arg, sizeof(filter)))
1615 		return -EFAULT;
1616 
1617 	spin_lock_irqsave(&md->pw_lock, flags);
1618 	list_for_each_entry(pw_filter, &priv->pw_filters, priv_node) {
1619 		if (rio_mport_match_pw_filter(&pw_filter->filter, &filter)) {
1620 			rio_mport_delete_pw_filter(pw_filter);
1621 			ret = 0;
1622 			break;
1623 		}
1624 	}
1625 
1626 	if (list_empty(&md->portwrites))
1627 		hdel = 1;
1628 	spin_unlock_irqrestore(&md->pw_lock, flags);
1629 
1630 	if (hdel) {
1631 		rio_del_mport_pw_handler(md->mport, priv->md,
1632 					 rio_mport_pw_handler);
1633 		rio_pw_enable(md->mport, 0);
1634 	}
1635 
1636 	return ret;
1637 }
1638 
1639 /*
1640  * rio_release_dev - release routine for kernel RIO device object
1641  * @dev: kernel device object associated with a RIO device structure
1642  *
1643  * Frees a RIO device struct associated a RIO device struct.
1644  * The RIO device struct is freed.
1645  */
1646 static void rio_release_dev(struct device *dev)
1647 {
1648 	struct rio_dev *rdev;
1649 
1650 	rdev = to_rio_dev(dev);
1651 	pr_info(DRV_PREFIX "%s: %s\n", __func__, rio_name(rdev));
1652 	kfree(rdev);
1653 }
1654 
1655 
1656 static void rio_release_net(struct device *dev)
1657 {
1658 	struct rio_net *net;
1659 
1660 	net = to_rio_net(dev);
1661 	rmcd_debug(RDEV, "net_%d", net->id);
1662 	kfree(net);
1663 }
1664 
1665 
1666 /*
1667  * rio_mport_add_riodev - creates a kernel RIO device object
1668  *
1669  * Allocates a RIO device data structure and initializes required fields based
1670  * on device's configuration space contents.
1671  * If the device has switch capabilities, then a switch specific portion is
1672  * allocated and configured.
1673  */
1674 static int rio_mport_add_riodev(struct mport_cdev_priv *priv,
1675 				   void __user *arg)
1676 {
1677 	struct mport_dev *md = priv->md;
1678 	struct rio_rdev_info dev_info;
1679 	struct rio_dev *rdev;
1680 	struct rio_switch *rswitch = NULL;
1681 	struct rio_mport *mport;
1682 	size_t size;
1683 	u32 rval;
1684 	u32 swpinfo = 0;
1685 	u16 destid;
1686 	u8 hopcount;
1687 	int err;
1688 
1689 	if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1690 		return -EFAULT;
1691 	dev_info.name[sizeof(dev_info.name) - 1] = '\0';
1692 
1693 	rmcd_debug(RDEV, "name:%s ct:0x%x did:0x%x hc:0x%x", dev_info.name,
1694 		   dev_info.comptag, dev_info.destid, dev_info.hopcount);
1695 
1696 	if (bus_find_device_by_name(&rio_bus_type, NULL, dev_info.name)) {
1697 		rmcd_debug(RDEV, "device %s already exists", dev_info.name);
1698 		return -EEXIST;
1699 	}
1700 
1701 	size = sizeof(*rdev);
1702 	mport = md->mport;
1703 	destid = dev_info.destid;
1704 	hopcount = dev_info.hopcount;
1705 
1706 	if (rio_mport_read_config_32(mport, destid, hopcount,
1707 				     RIO_PEF_CAR, &rval))
1708 		return -EIO;
1709 
1710 	if (rval & RIO_PEF_SWITCH) {
1711 		rio_mport_read_config_32(mport, destid, hopcount,
1712 					 RIO_SWP_INFO_CAR, &swpinfo);
1713 		size += (RIO_GET_TOTAL_PORTS(swpinfo) *
1714 			 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
1715 	}
1716 
1717 	rdev = kzalloc(size, GFP_KERNEL);
1718 	if (rdev == NULL)
1719 		return -ENOMEM;
1720 
1721 	if (mport->net == NULL) {
1722 		struct rio_net *net;
1723 
1724 		net = rio_alloc_net(mport);
1725 		if (!net) {
1726 			err = -ENOMEM;
1727 			rmcd_debug(RDEV, "failed to allocate net object");
1728 			goto cleanup;
1729 		}
1730 
1731 		net->id = mport->id;
1732 		net->hport = mport;
1733 		dev_set_name(&net->dev, "rnet_%d", net->id);
1734 		net->dev.parent = &mport->dev;
1735 		net->dev.release = rio_release_net;
1736 		err = rio_add_net(net);
1737 		if (err) {
1738 			rmcd_debug(RDEV, "failed to register net, err=%d", err);
1739 			kfree(net);
1740 			goto cleanup;
1741 		}
1742 	}
1743 
1744 	rdev->net = mport->net;
1745 	rdev->pef = rval;
1746 	rdev->swpinfo = swpinfo;
1747 	rio_mport_read_config_32(mport, destid, hopcount,
1748 				 RIO_DEV_ID_CAR, &rval);
1749 	rdev->did = rval >> 16;
1750 	rdev->vid = rval & 0xffff;
1751 	rio_mport_read_config_32(mport, destid, hopcount, RIO_DEV_INFO_CAR,
1752 				 &rdev->device_rev);
1753 	rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_ID_CAR,
1754 				 &rval);
1755 	rdev->asm_did = rval >> 16;
1756 	rdev->asm_vid = rval & 0xffff;
1757 	rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_INFO_CAR,
1758 				 &rval);
1759 	rdev->asm_rev = rval >> 16;
1760 
1761 	if (rdev->pef & RIO_PEF_EXT_FEATURES) {
1762 		rdev->efptr = rval & 0xffff;
1763 		rdev->phys_efptr = rio_mport_get_physefb(mport, 0, destid,
1764 						hopcount, &rdev->phys_rmap);
1765 
1766 		rdev->em_efptr = rio_mport_get_feature(mport, 0, destid,
1767 						hopcount, RIO_EFB_ERR_MGMNT);
1768 	}
1769 
1770 	rio_mport_read_config_32(mport, destid, hopcount, RIO_SRC_OPS_CAR,
1771 				 &rdev->src_ops);
1772 	rio_mport_read_config_32(mport, destid, hopcount, RIO_DST_OPS_CAR,
1773 				 &rdev->dst_ops);
1774 
1775 	rdev->comp_tag = dev_info.comptag;
1776 	rdev->destid = destid;
1777 	/* hopcount is stored as specified by a caller, regardles of EP or SW */
1778 	rdev->hopcount = hopcount;
1779 
1780 	if (rdev->pef & RIO_PEF_SWITCH) {
1781 		rswitch = rdev->rswitch;
1782 		rswitch->route_table = NULL;
1783 	}
1784 
1785 	if (strlen(dev_info.name))
1786 		dev_set_name(&rdev->dev, "%s", dev_info.name);
1787 	else if (rdev->pef & RIO_PEF_SWITCH)
1788 		dev_set_name(&rdev->dev, "%02x:s:%04x", mport->id,
1789 			     rdev->comp_tag & RIO_CTAG_UDEVID);
1790 	else
1791 		dev_set_name(&rdev->dev, "%02x:e:%04x", mport->id,
1792 			     rdev->comp_tag & RIO_CTAG_UDEVID);
1793 
1794 	INIT_LIST_HEAD(&rdev->net_list);
1795 	rdev->dev.parent = &mport->net->dev;
1796 	rio_attach_device(rdev);
1797 	rdev->dev.release = rio_release_dev;
1798 
1799 	if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
1800 		rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
1801 				   0, 0xffff);
1802 	err = rio_add_device(rdev);
1803 	if (err)
1804 		goto cleanup;
1805 	rio_dev_get(rdev);
1806 
1807 	return 0;
1808 cleanup:
1809 	kfree(rdev);
1810 	return err;
1811 }
1812 
1813 static int rio_mport_del_riodev(struct mport_cdev_priv *priv, void __user *arg)
1814 {
1815 	struct rio_rdev_info dev_info;
1816 	struct rio_dev *rdev = NULL;
1817 	struct device  *dev;
1818 	struct rio_mport *mport;
1819 	struct rio_net *net;
1820 
1821 	if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1822 		return -EFAULT;
1823 	dev_info.name[sizeof(dev_info.name) - 1] = '\0';
1824 
1825 	mport = priv->md->mport;
1826 
1827 	/* If device name is specified, removal by name has priority */
1828 	if (strlen(dev_info.name)) {
1829 		dev = bus_find_device_by_name(&rio_bus_type, NULL,
1830 					      dev_info.name);
1831 		if (dev)
1832 			rdev = to_rio_dev(dev);
1833 	} else {
1834 		do {
1835 			rdev = rio_get_comptag(dev_info.comptag, rdev);
1836 			if (rdev && rdev->dev.parent == &mport->net->dev &&
1837 			    rdev->destid == dev_info.destid &&
1838 			    rdev->hopcount == dev_info.hopcount)
1839 				break;
1840 		} while (rdev);
1841 	}
1842 
1843 	if (!rdev) {
1844 		rmcd_debug(RDEV,
1845 			"device name:%s ct:0x%x did:0x%x hc:0x%x not found",
1846 			dev_info.name, dev_info.comptag, dev_info.destid,
1847 			dev_info.hopcount);
1848 		return -ENODEV;
1849 	}
1850 
1851 	net = rdev->net;
1852 	rio_dev_put(rdev);
1853 	rio_del_device(rdev, RIO_DEVICE_SHUTDOWN);
1854 
1855 	if (list_empty(&net->devices)) {
1856 		rio_free_net(net);
1857 		mport->net = NULL;
1858 	}
1859 
1860 	return 0;
1861 }
1862 
1863 /*
1864  * Mport cdev management
1865  */
1866 
1867 /*
1868  * mport_cdev_open() - Open character device (mport)
1869  */
1870 static int mport_cdev_open(struct inode *inode, struct file *filp)
1871 {
1872 	int ret;
1873 	int minor = iminor(inode);
1874 	struct mport_dev *chdev;
1875 	struct mport_cdev_priv *priv;
1876 
1877 	/* Test for valid device */
1878 	if (minor >= RIO_MAX_MPORTS) {
1879 		rmcd_error("Invalid minor device number");
1880 		return -EINVAL;
1881 	}
1882 
1883 	chdev = container_of(inode->i_cdev, struct mport_dev, cdev);
1884 
1885 	rmcd_debug(INIT, "%s filp=%p", dev_name(&chdev->dev), filp);
1886 
1887 	if (atomic_read(&chdev->active) == 0)
1888 		return -ENODEV;
1889 
1890 	get_device(&chdev->dev);
1891 
1892 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1893 	if (!priv) {
1894 		put_device(&chdev->dev);
1895 		return -ENOMEM;
1896 	}
1897 
1898 	priv->md = chdev;
1899 
1900 	mutex_lock(&chdev->file_mutex);
1901 	list_add_tail(&priv->list, &chdev->file_list);
1902 	mutex_unlock(&chdev->file_mutex);
1903 
1904 	INIT_LIST_HEAD(&priv->db_filters);
1905 	INIT_LIST_HEAD(&priv->pw_filters);
1906 	spin_lock_init(&priv->fifo_lock);
1907 	init_waitqueue_head(&priv->event_rx_wait);
1908 	ret = kfifo_alloc(&priv->event_fifo,
1909 			  sizeof(struct rio_event) * MPORT_EVENT_DEPTH,
1910 			  GFP_KERNEL);
1911 	if (ret < 0) {
1912 		dev_err(&chdev->dev, DRV_NAME ": kfifo_alloc failed\n");
1913 		ret = -ENOMEM;
1914 		goto err_fifo;
1915 	}
1916 
1917 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1918 	INIT_LIST_HEAD(&priv->async_list);
1919 	spin_lock_init(&priv->req_lock);
1920 	mutex_init(&priv->dma_lock);
1921 #endif
1922 
1923 	filp->private_data = priv;
1924 	goto out;
1925 err_fifo:
1926 	kfree(priv);
1927 out:
1928 	return ret;
1929 }
1930 
1931 static int mport_cdev_fasync(int fd, struct file *filp, int mode)
1932 {
1933 	struct mport_cdev_priv *priv = filp->private_data;
1934 
1935 	return fasync_helper(fd, filp, mode, &priv->async_queue);
1936 }
1937 
1938 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1939 static void mport_cdev_release_dma(struct file *filp)
1940 {
1941 	struct mport_cdev_priv *priv = filp->private_data;
1942 	struct mport_dev *md;
1943 	struct mport_dma_req *req, *req_next;
1944 	unsigned long tmo = msecs_to_jiffies(dma_timeout);
1945 	long wret;
1946 	LIST_HEAD(list);
1947 
1948 	rmcd_debug(EXIT, "from filp=%p %s(%d)",
1949 		   filp, current->comm, task_pid_nr(current));
1950 
1951 	if (!priv->dmach) {
1952 		rmcd_debug(EXIT, "No DMA channel for filp=%p", filp);
1953 		return;
1954 	}
1955 
1956 	md = priv->md;
1957 
1958 	spin_lock(&priv->req_lock);
1959 	if (!list_empty(&priv->async_list)) {
1960 		rmcd_debug(EXIT, "async list not empty filp=%p %s(%d)",
1961 			   filp, current->comm, task_pid_nr(current));
1962 		list_splice_init(&priv->async_list, &list);
1963 	}
1964 	spin_unlock(&priv->req_lock);
1965 
1966 	if (!list_empty(&list)) {
1967 		rmcd_debug(EXIT, "temp list not empty");
1968 		list_for_each_entry_safe(req, req_next, &list, node) {
1969 			rmcd_debug(EXIT, "free req->filp=%p cookie=%d compl=%s",
1970 				   req->filp, req->cookie,
1971 				   completion_done(&req->req_comp)?"yes":"no");
1972 			list_del(&req->node);
1973 			kref_put(&req->refcount, dma_req_free);
1974 		}
1975 	}
1976 
1977 	put_dma_channel(priv);
1978 	wret = wait_for_completion_interruptible_timeout(&priv->comp, tmo);
1979 
1980 	if (wret <= 0) {
1981 		rmcd_error("%s(%d) failed waiting for DMA release err=%ld",
1982 			current->comm, task_pid_nr(current), wret);
1983 	}
1984 
1985 	if (priv->dmach != priv->md->dma_chan) {
1986 		rmcd_debug(EXIT, "Release DMA channel for filp=%p %s(%d)",
1987 			   filp, current->comm, task_pid_nr(current));
1988 		rio_release_dma(priv->dmach);
1989 	} else {
1990 		rmcd_debug(EXIT, "Adjust default DMA channel refcount");
1991 		kref_put(&md->dma_ref, mport_release_def_dma);
1992 	}
1993 
1994 	priv->dmach = NULL;
1995 }
1996 #else
1997 #define mport_cdev_release_dma(priv) do {} while (0)
1998 #endif
1999 
2000 /*
2001  * mport_cdev_release() - Release character device
2002  */
2003 static int mport_cdev_release(struct inode *inode, struct file *filp)
2004 {
2005 	struct mport_cdev_priv *priv = filp->private_data;
2006 	struct mport_dev *chdev;
2007 	struct rio_mport_pw_filter *pw_filter, *pw_filter_next;
2008 	struct rio_mport_db_filter *db_filter, *db_filter_next;
2009 	struct rio_mport_mapping *map, *_map;
2010 	unsigned long flags;
2011 
2012 	rmcd_debug(EXIT, "%s filp=%p", dev_name(&priv->md->dev), filp);
2013 
2014 	chdev = priv->md;
2015 	mport_cdev_release_dma(filp);
2016 
2017 	priv->event_mask = 0;
2018 
2019 	spin_lock_irqsave(&chdev->pw_lock, flags);
2020 	if (!list_empty(&priv->pw_filters)) {
2021 		list_for_each_entry_safe(pw_filter, pw_filter_next,
2022 					 &priv->pw_filters, priv_node)
2023 			rio_mport_delete_pw_filter(pw_filter);
2024 	}
2025 	spin_unlock_irqrestore(&chdev->pw_lock, flags);
2026 
2027 	spin_lock_irqsave(&chdev->db_lock, flags);
2028 	list_for_each_entry_safe(db_filter, db_filter_next,
2029 				 &priv->db_filters, priv_node) {
2030 		rio_mport_delete_db_filter(db_filter);
2031 	}
2032 	spin_unlock_irqrestore(&chdev->db_lock, flags);
2033 
2034 	kfifo_free(&priv->event_fifo);
2035 
2036 	mutex_lock(&chdev->buf_mutex);
2037 	list_for_each_entry_safe(map, _map, &chdev->mappings, node) {
2038 		if (map->filp == filp) {
2039 			rmcd_debug(EXIT, "release mapping %p filp=%p",
2040 				   map->virt_addr, filp);
2041 			kref_put(&map->ref, mport_release_mapping);
2042 		}
2043 	}
2044 	mutex_unlock(&chdev->buf_mutex);
2045 
2046 	mport_cdev_fasync(-1, filp, 0);
2047 	filp->private_data = NULL;
2048 	mutex_lock(&chdev->file_mutex);
2049 	list_del(&priv->list);
2050 	mutex_unlock(&chdev->file_mutex);
2051 	put_device(&chdev->dev);
2052 	kfree(priv);
2053 	return 0;
2054 }
2055 
2056 /*
2057  * mport_cdev_ioctl() - IOCTLs for character device
2058  */
2059 static long mport_cdev_ioctl(struct file *filp,
2060 		unsigned int cmd, unsigned long arg)
2061 {
2062 	int err = -EINVAL;
2063 	struct mport_cdev_priv *data = filp->private_data;
2064 	struct mport_dev *md = data->md;
2065 
2066 	if (atomic_read(&md->active) == 0)
2067 		return -ENODEV;
2068 
2069 	switch (cmd) {
2070 	case RIO_MPORT_MAINT_READ_LOCAL:
2071 		return rio_mport_maint_rd(data, (void __user *)arg, 1);
2072 	case RIO_MPORT_MAINT_WRITE_LOCAL:
2073 		return rio_mport_maint_wr(data, (void __user *)arg, 1);
2074 	case RIO_MPORT_MAINT_READ_REMOTE:
2075 		return rio_mport_maint_rd(data, (void __user *)arg, 0);
2076 	case RIO_MPORT_MAINT_WRITE_REMOTE:
2077 		return rio_mport_maint_wr(data, (void __user *)arg, 0);
2078 	case RIO_MPORT_MAINT_HDID_SET:
2079 		return maint_hdid_set(data, (void __user *)arg);
2080 	case RIO_MPORT_MAINT_COMPTAG_SET:
2081 		return maint_comptag_set(data, (void __user *)arg);
2082 	case RIO_MPORT_MAINT_PORT_IDX_GET:
2083 		return maint_port_idx_get(data, (void __user *)arg);
2084 	case RIO_MPORT_GET_PROPERTIES:
2085 		md->properties.hdid = md->mport->host_deviceid;
2086 		if (copy_to_user((void __user *)arg, &(md->properties),
2087 				 sizeof(md->properties)))
2088 			return -EFAULT;
2089 		return 0;
2090 	case RIO_ENABLE_DOORBELL_RANGE:
2091 		return rio_mport_add_db_filter(data, (void __user *)arg);
2092 	case RIO_DISABLE_DOORBELL_RANGE:
2093 		return rio_mport_remove_db_filter(data, (void __user *)arg);
2094 	case RIO_ENABLE_PORTWRITE_RANGE:
2095 		return rio_mport_add_pw_filter(data, (void __user *)arg);
2096 	case RIO_DISABLE_PORTWRITE_RANGE:
2097 		return rio_mport_remove_pw_filter(data, (void __user *)arg);
2098 	case RIO_SET_EVENT_MASK:
2099 		data->event_mask = (u32)arg;
2100 		return 0;
2101 	case RIO_GET_EVENT_MASK:
2102 		if (copy_to_user((void __user *)arg, &data->event_mask,
2103 				    sizeof(u32)))
2104 			return -EFAULT;
2105 		return 0;
2106 	case RIO_MAP_OUTBOUND:
2107 		return rio_mport_obw_map(filp, (void __user *)arg);
2108 	case RIO_MAP_INBOUND:
2109 		return rio_mport_map_inbound(filp, (void __user *)arg);
2110 	case RIO_UNMAP_OUTBOUND:
2111 		return rio_mport_obw_free(filp, (void __user *)arg);
2112 	case RIO_UNMAP_INBOUND:
2113 		return rio_mport_inbound_free(filp, (void __user *)arg);
2114 	case RIO_ALLOC_DMA:
2115 		return rio_mport_alloc_dma(filp, (void __user *)arg);
2116 	case RIO_FREE_DMA:
2117 		return rio_mport_free_dma(filp, (void __user *)arg);
2118 	case RIO_WAIT_FOR_ASYNC:
2119 		return rio_mport_wait_for_async_dma(filp, (void __user *)arg);
2120 	case RIO_TRANSFER:
2121 		return rio_mport_transfer_ioctl(filp, (void __user *)arg);
2122 	case RIO_DEV_ADD:
2123 		return rio_mport_add_riodev(data, (void __user *)arg);
2124 	case RIO_DEV_DEL:
2125 		return rio_mport_del_riodev(data, (void __user *)arg);
2126 	default:
2127 		break;
2128 	}
2129 
2130 	return err;
2131 }
2132 
2133 /*
2134  * mport_release_mapping - free mapping resources and info structure
2135  * @ref: a pointer to the kref within struct rio_mport_mapping
2136  *
2137  * NOTE: Shall be called while holding buf_mutex.
2138  */
2139 static void mport_release_mapping(struct kref *ref)
2140 {
2141 	struct rio_mport_mapping *map =
2142 			container_of(ref, struct rio_mport_mapping, ref);
2143 	struct rio_mport *mport = map->md->mport;
2144 
2145 	rmcd_debug(MMAP, "type %d mapping @ %p (phys = %pad) for %s",
2146 		   map->dir, map->virt_addr,
2147 		   &map->phys_addr, mport->name);
2148 
2149 	list_del(&map->node);
2150 
2151 	switch (map->dir) {
2152 	case MAP_INBOUND:
2153 		rio_unmap_inb_region(mport, map->phys_addr);
2154 		/* fall through */
2155 	case MAP_DMA:
2156 		dma_free_coherent(mport->dev.parent, map->size,
2157 				  map->virt_addr, map->phys_addr);
2158 		break;
2159 	case MAP_OUTBOUND:
2160 		rio_unmap_outb_region(mport, map->rioid, map->rio_addr);
2161 		break;
2162 	}
2163 	kfree(map);
2164 }
2165 
2166 static void mport_mm_open(struct vm_area_struct *vma)
2167 {
2168 	struct rio_mport_mapping *map = vma->vm_private_data;
2169 
2170 	rmcd_debug(MMAP, "%pad", &map->phys_addr);
2171 	kref_get(&map->ref);
2172 }
2173 
2174 static void mport_mm_close(struct vm_area_struct *vma)
2175 {
2176 	struct rio_mport_mapping *map = vma->vm_private_data;
2177 
2178 	rmcd_debug(MMAP, "%pad", &map->phys_addr);
2179 	mutex_lock(&map->md->buf_mutex);
2180 	kref_put(&map->ref, mport_release_mapping);
2181 	mutex_unlock(&map->md->buf_mutex);
2182 }
2183 
2184 static const struct vm_operations_struct vm_ops = {
2185 	.open =	mport_mm_open,
2186 	.close = mport_mm_close,
2187 };
2188 
2189 static int mport_cdev_mmap(struct file *filp, struct vm_area_struct *vma)
2190 {
2191 	struct mport_cdev_priv *priv = filp->private_data;
2192 	struct mport_dev *md;
2193 	size_t size = vma->vm_end - vma->vm_start;
2194 	dma_addr_t baddr;
2195 	unsigned long offset;
2196 	int found = 0, ret;
2197 	struct rio_mport_mapping *map;
2198 
2199 	rmcd_debug(MMAP, "0x%x bytes at offset 0x%lx",
2200 		   (unsigned int)size, vma->vm_pgoff);
2201 
2202 	md = priv->md;
2203 	baddr = ((dma_addr_t)vma->vm_pgoff << PAGE_SHIFT);
2204 
2205 	mutex_lock(&md->buf_mutex);
2206 	list_for_each_entry(map, &md->mappings, node) {
2207 		if (baddr >= map->phys_addr &&
2208 		    baddr < (map->phys_addr + map->size)) {
2209 			found = 1;
2210 			break;
2211 		}
2212 	}
2213 	mutex_unlock(&md->buf_mutex);
2214 
2215 	if (!found)
2216 		return -ENOMEM;
2217 
2218 	offset = baddr - map->phys_addr;
2219 
2220 	if (size + offset > map->size)
2221 		return -EINVAL;
2222 
2223 	vma->vm_pgoff = offset >> PAGE_SHIFT;
2224 	rmcd_debug(MMAP, "MMAP adjusted offset = 0x%lx", vma->vm_pgoff);
2225 
2226 	if (map->dir == MAP_INBOUND || map->dir == MAP_DMA)
2227 		ret = dma_mmap_coherent(md->mport->dev.parent, vma,
2228 				map->virt_addr, map->phys_addr, map->size);
2229 	else if (map->dir == MAP_OUTBOUND) {
2230 		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
2231 		ret = vm_iomap_memory(vma, map->phys_addr, map->size);
2232 	} else {
2233 		rmcd_error("Attempt to mmap unsupported mapping type");
2234 		ret = -EIO;
2235 	}
2236 
2237 	if (!ret) {
2238 		vma->vm_private_data = map;
2239 		vma->vm_ops = &vm_ops;
2240 		mport_mm_open(vma);
2241 	} else {
2242 		rmcd_error("MMAP exit with err=%d", ret);
2243 	}
2244 
2245 	return ret;
2246 }
2247 
2248 static __poll_t mport_cdev_poll(struct file *filp, poll_table *wait)
2249 {
2250 	struct mport_cdev_priv *priv = filp->private_data;
2251 
2252 	poll_wait(filp, &priv->event_rx_wait, wait);
2253 	if (kfifo_len(&priv->event_fifo))
2254 		return EPOLLIN | EPOLLRDNORM;
2255 
2256 	return 0;
2257 }
2258 
2259 static ssize_t mport_read(struct file *filp, char __user *buf, size_t count,
2260 			loff_t *ppos)
2261 {
2262 	struct mport_cdev_priv *priv = filp->private_data;
2263 	int copied;
2264 	ssize_t ret;
2265 
2266 	if (!count)
2267 		return 0;
2268 
2269 	if (kfifo_is_empty(&priv->event_fifo) &&
2270 	    (filp->f_flags & O_NONBLOCK))
2271 		return -EAGAIN;
2272 
2273 	if (count % sizeof(struct rio_event))
2274 		return -EINVAL;
2275 
2276 	ret = wait_event_interruptible(priv->event_rx_wait,
2277 					kfifo_len(&priv->event_fifo) != 0);
2278 	if (ret)
2279 		return ret;
2280 
2281 	while (ret < count) {
2282 		if (kfifo_to_user(&priv->event_fifo, buf,
2283 		      sizeof(struct rio_event), &copied))
2284 			return -EFAULT;
2285 		ret += copied;
2286 		buf += copied;
2287 	}
2288 
2289 	return ret;
2290 }
2291 
2292 static ssize_t mport_write(struct file *filp, const char __user *buf,
2293 			 size_t count, loff_t *ppos)
2294 {
2295 	struct mport_cdev_priv *priv = filp->private_data;
2296 	struct rio_mport *mport = priv->md->mport;
2297 	struct rio_event event;
2298 	int len, ret;
2299 
2300 	if (!count)
2301 		return 0;
2302 
2303 	if (count % sizeof(event))
2304 		return -EINVAL;
2305 
2306 	len = 0;
2307 	while ((count - len) >= (int)sizeof(event)) {
2308 		if (copy_from_user(&event, buf, sizeof(event)))
2309 			return -EFAULT;
2310 
2311 		if (event.header != RIO_DOORBELL)
2312 			return -EINVAL;
2313 
2314 		ret = rio_mport_send_doorbell(mport,
2315 					      event.u.doorbell.rioid,
2316 					      event.u.doorbell.payload);
2317 		if (ret < 0)
2318 			return ret;
2319 
2320 		len += sizeof(event);
2321 		buf += sizeof(event);
2322 	}
2323 
2324 	return len;
2325 }
2326 
2327 static const struct file_operations mport_fops = {
2328 	.owner		= THIS_MODULE,
2329 	.open		= mport_cdev_open,
2330 	.release	= mport_cdev_release,
2331 	.poll		= mport_cdev_poll,
2332 	.read		= mport_read,
2333 	.write		= mport_write,
2334 	.mmap		= mport_cdev_mmap,
2335 	.fasync		= mport_cdev_fasync,
2336 	.unlocked_ioctl = mport_cdev_ioctl
2337 };
2338 
2339 /*
2340  * Character device management
2341  */
2342 
2343 static void mport_device_release(struct device *dev)
2344 {
2345 	struct mport_dev *md;
2346 
2347 	rmcd_debug(EXIT, "%s", dev_name(dev));
2348 	md = container_of(dev, struct mport_dev, dev);
2349 	kfree(md);
2350 }
2351 
2352 /*
2353  * mport_cdev_add() - Create mport_dev from rio_mport
2354  * @mport:	RapidIO master port
2355  */
2356 static struct mport_dev *mport_cdev_add(struct rio_mport *mport)
2357 {
2358 	int ret = 0;
2359 	struct mport_dev *md;
2360 	struct rio_mport_attr attr;
2361 
2362 	md = kzalloc(sizeof(*md), GFP_KERNEL);
2363 	if (!md) {
2364 		rmcd_error("Unable allocate a device object");
2365 		return NULL;
2366 	}
2367 
2368 	md->mport = mport;
2369 	mutex_init(&md->buf_mutex);
2370 	mutex_init(&md->file_mutex);
2371 	INIT_LIST_HEAD(&md->file_list);
2372 
2373 	device_initialize(&md->dev);
2374 	md->dev.devt = MKDEV(MAJOR(dev_number), mport->id);
2375 	md->dev.class = dev_class;
2376 	md->dev.parent = &mport->dev;
2377 	md->dev.release = mport_device_release;
2378 	dev_set_name(&md->dev, DEV_NAME "%d", mport->id);
2379 	atomic_set(&md->active, 1);
2380 
2381 	cdev_init(&md->cdev, &mport_fops);
2382 	md->cdev.owner = THIS_MODULE;
2383 
2384 	INIT_LIST_HEAD(&md->doorbells);
2385 	spin_lock_init(&md->db_lock);
2386 	INIT_LIST_HEAD(&md->portwrites);
2387 	spin_lock_init(&md->pw_lock);
2388 	INIT_LIST_HEAD(&md->mappings);
2389 
2390 	md->properties.id = mport->id;
2391 	md->properties.sys_size = mport->sys_size;
2392 	md->properties.hdid = mport->host_deviceid;
2393 	md->properties.index = mport->index;
2394 
2395 	/* The transfer_mode property will be returned through mport query
2396 	 * interface
2397 	 */
2398 #ifdef CONFIG_FSL_RIO /* for now: only on Freescale's SoCs */
2399 	md->properties.transfer_mode |= RIO_TRANSFER_MODE_MAPPED;
2400 #else
2401 	md->properties.transfer_mode |= RIO_TRANSFER_MODE_TRANSFER;
2402 #endif
2403 
2404 	ret = cdev_device_add(&md->cdev, &md->dev);
2405 	if (ret) {
2406 		rmcd_error("Failed to register mport %d (err=%d)",
2407 		       mport->id, ret);
2408 		goto err_cdev;
2409 	}
2410 	ret = rio_query_mport(mport, &attr);
2411 	if (!ret) {
2412 		md->properties.flags = attr.flags;
2413 		md->properties.link_speed = attr.link_speed;
2414 		md->properties.link_width = attr.link_width;
2415 		md->properties.dma_max_sge = attr.dma_max_sge;
2416 		md->properties.dma_max_size = attr.dma_max_size;
2417 		md->properties.dma_align = attr.dma_align;
2418 		md->properties.cap_sys_size = 0;
2419 		md->properties.cap_transfer_mode = 0;
2420 		md->properties.cap_addr_size = 0;
2421 	} else
2422 		pr_info(DRV_PREFIX "Failed to obtain info for %s cdev(%d:%d)\n",
2423 			mport->name, MAJOR(dev_number), mport->id);
2424 
2425 	mutex_lock(&mport_devs_lock);
2426 	list_add_tail(&md->node, &mport_devs);
2427 	mutex_unlock(&mport_devs_lock);
2428 
2429 	pr_info(DRV_PREFIX "Added %s cdev(%d:%d)\n",
2430 		mport->name, MAJOR(dev_number), mport->id);
2431 
2432 	return md;
2433 
2434 err_cdev:
2435 	put_device(&md->dev);
2436 	return NULL;
2437 }
2438 
2439 /*
2440  * mport_cdev_terminate_dma() - Stop all active DMA data transfers and release
2441  *                              associated DMA channels.
2442  */
2443 static void mport_cdev_terminate_dma(struct mport_dev *md)
2444 {
2445 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
2446 	struct mport_cdev_priv *client;
2447 
2448 	rmcd_debug(DMA, "%s", dev_name(&md->dev));
2449 
2450 	mutex_lock(&md->file_mutex);
2451 	list_for_each_entry(client, &md->file_list, list) {
2452 		if (client->dmach) {
2453 			dmaengine_terminate_all(client->dmach);
2454 			rio_release_dma(client->dmach);
2455 		}
2456 	}
2457 	mutex_unlock(&md->file_mutex);
2458 
2459 	if (md->dma_chan) {
2460 		dmaengine_terminate_all(md->dma_chan);
2461 		rio_release_dma(md->dma_chan);
2462 		md->dma_chan = NULL;
2463 	}
2464 #endif
2465 }
2466 
2467 
2468 /*
2469  * mport_cdev_kill_fasync() - Send SIGIO signal to all processes with open
2470  *                            mport_cdev files.
2471  */
2472 static int mport_cdev_kill_fasync(struct mport_dev *md)
2473 {
2474 	unsigned int files = 0;
2475 	struct mport_cdev_priv *client;
2476 
2477 	mutex_lock(&md->file_mutex);
2478 	list_for_each_entry(client, &md->file_list, list) {
2479 		if (client->async_queue)
2480 			kill_fasync(&client->async_queue, SIGIO, POLL_HUP);
2481 		files++;
2482 	}
2483 	mutex_unlock(&md->file_mutex);
2484 	return files;
2485 }
2486 
2487 /*
2488  * mport_cdev_remove() - Remove mport character device
2489  * @dev:	Mport device to remove
2490  */
2491 static void mport_cdev_remove(struct mport_dev *md)
2492 {
2493 	struct rio_mport_mapping *map, *_map;
2494 
2495 	rmcd_debug(EXIT, "Remove %s cdev", md->mport->name);
2496 	atomic_set(&md->active, 0);
2497 	mport_cdev_terminate_dma(md);
2498 	rio_del_mport_pw_handler(md->mport, md, rio_mport_pw_handler);
2499 	cdev_device_del(&md->cdev, &md->dev);
2500 	mport_cdev_kill_fasync(md);
2501 
2502 	/* TODO: do we need to give clients some time to close file
2503 	 * descriptors? Simple wait for XX, or kref?
2504 	 */
2505 
2506 	/*
2507 	 * Release DMA buffers allocated for the mport device.
2508 	 * Disable associated inbound Rapidio requests mapping if applicable.
2509 	 */
2510 	mutex_lock(&md->buf_mutex);
2511 	list_for_each_entry_safe(map, _map, &md->mappings, node) {
2512 		kref_put(&map->ref, mport_release_mapping);
2513 	}
2514 	mutex_unlock(&md->buf_mutex);
2515 
2516 	if (!list_empty(&md->mappings))
2517 		rmcd_warn("WARNING: %s pending mappings on removal",
2518 			  md->mport->name);
2519 
2520 	rio_release_inb_dbell(md->mport, 0, 0x0fff);
2521 
2522 	put_device(&md->dev);
2523 }
2524 
2525 /*
2526  * RIO rio_mport_interface driver
2527  */
2528 
2529 /*
2530  * mport_add_mport() - Add rio_mport from LDM device struct
2531  * @dev:		Linux device model struct
2532  * @class_intf:	Linux class_interface
2533  */
2534 static int mport_add_mport(struct device *dev,
2535 		struct class_interface *class_intf)
2536 {
2537 	struct rio_mport *mport = NULL;
2538 	struct mport_dev *chdev = NULL;
2539 
2540 	mport = to_rio_mport(dev);
2541 	if (!mport)
2542 		return -ENODEV;
2543 
2544 	chdev = mport_cdev_add(mport);
2545 	if (!chdev)
2546 		return -ENODEV;
2547 
2548 	return 0;
2549 }
2550 
2551 /*
2552  * mport_remove_mport() - Remove rio_mport from global list
2553  * TODO remove device from global mport_dev list
2554  */
2555 static void mport_remove_mport(struct device *dev,
2556 		struct class_interface *class_intf)
2557 {
2558 	struct rio_mport *mport = NULL;
2559 	struct mport_dev *chdev;
2560 	int found = 0;
2561 
2562 	mport = to_rio_mport(dev);
2563 	rmcd_debug(EXIT, "Remove %s", mport->name);
2564 
2565 	mutex_lock(&mport_devs_lock);
2566 	list_for_each_entry(chdev, &mport_devs, node) {
2567 		if (chdev->mport->id == mport->id) {
2568 			atomic_set(&chdev->active, 0);
2569 			list_del(&chdev->node);
2570 			found = 1;
2571 			break;
2572 		}
2573 	}
2574 	mutex_unlock(&mport_devs_lock);
2575 
2576 	if (found)
2577 		mport_cdev_remove(chdev);
2578 }
2579 
2580 /* the rio_mport_interface is used to handle local mport devices */
2581 static struct class_interface rio_mport_interface __refdata = {
2582 	.class		= &rio_mport_class,
2583 	.add_dev	= mport_add_mport,
2584 	.remove_dev	= mport_remove_mport,
2585 };
2586 
2587 /*
2588  * Linux kernel module
2589  */
2590 
2591 /*
2592  * mport_init - Driver module loading
2593  */
2594 static int __init mport_init(void)
2595 {
2596 	int ret;
2597 
2598 	/* Create device class needed by udev */
2599 	dev_class = class_create(THIS_MODULE, DRV_NAME);
2600 	if (IS_ERR(dev_class)) {
2601 		rmcd_error("Unable to create " DRV_NAME " class");
2602 		return PTR_ERR(dev_class);
2603 	}
2604 
2605 	ret = alloc_chrdev_region(&dev_number, 0, RIO_MAX_MPORTS, DRV_NAME);
2606 	if (ret < 0)
2607 		goto err_chr;
2608 
2609 	rmcd_debug(INIT, "Registered class with major=%d", MAJOR(dev_number));
2610 
2611 	/* Register to rio_mport_interface */
2612 	ret = class_interface_register(&rio_mport_interface);
2613 	if (ret) {
2614 		rmcd_error("class_interface_register() failed, err=%d", ret);
2615 		goto err_cli;
2616 	}
2617 
2618 	return 0;
2619 
2620 err_cli:
2621 	unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2622 err_chr:
2623 	class_destroy(dev_class);
2624 	return ret;
2625 }
2626 
2627 /**
2628  * mport_exit - Driver module unloading
2629  */
2630 static void __exit mport_exit(void)
2631 {
2632 	class_interface_unregister(&rio_mport_interface);
2633 	class_destroy(dev_class);
2634 	unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2635 }
2636 
2637 module_init(mport_init);
2638 module_exit(mport_exit);
2639