1 /*
2  * RapidIO mport character device
3  *
4  * Copyright 2014-2015 Integrated Device Technology, Inc.
5  *    Alexandre Bounine <alexandre.bounine@idt.com>
6  * Copyright 2014-2015 Prodrive Technologies
7  *    Andre van Herk <andre.van.herk@prodrive-technologies.com>
8  *    Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>
9  * Copyright (C) 2014 Texas Instruments Incorporated
10  *    Aurelien Jacquiot <a-jacquiot@ti.com>
11  *
12  * This program is free software; you can redistribute  it and/or modify it
13  * under  the terms of  the GNU General  Public License as published by the
14  * Free Software Foundation;  either version 2 of the  License, or (at your
15  * option) any later version.
16  */
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/cdev.h>
20 #include <linux/ioctl.h>
21 #include <linux/uaccess.h>
22 #include <linux/list.h>
23 #include <linux/fs.h>
24 #include <linux/err.h>
25 #include <linux/net.h>
26 #include <linux/poll.h>
27 #include <linux/spinlock.h>
28 #include <linux/sched.h>
29 #include <linux/kfifo.h>
30 
31 #include <linux/mm.h>
32 #include <linux/slab.h>
33 #include <linux/vmalloc.h>
34 #include <linux/mman.h>
35 
36 #include <linux/dma-mapping.h>
37 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
38 #include <linux/dmaengine.h>
39 #endif
40 
41 #include <linux/rio.h>
42 #include <linux/rio_ids.h>
43 #include <linux/rio_drv.h>
44 #include <linux/rio_mport_cdev.h>
45 
46 #include "../rio.h"
47 
48 #define DRV_NAME	"rio_mport"
49 #define DRV_PREFIX	DRV_NAME ": "
50 #define DEV_NAME	"rio_mport"
51 #define DRV_VERSION     "1.0.0"
52 
53 /* Debug output filtering masks */
54 enum {
55 	DBG_NONE	= 0,
56 	DBG_INIT	= BIT(0), /* driver init */
57 	DBG_EXIT	= BIT(1), /* driver exit */
58 	DBG_MPORT	= BIT(2), /* mport add/remove */
59 	DBG_RDEV	= BIT(3), /* RapidIO device add/remove */
60 	DBG_DMA		= BIT(4), /* DMA transfer messages */
61 	DBG_MMAP	= BIT(5), /* mapping messages */
62 	DBG_IBW		= BIT(6), /* inbound window */
63 	DBG_EVENT	= BIT(7), /* event handling messages */
64 	DBG_OBW		= BIT(8), /* outbound window messages */
65 	DBG_DBELL	= BIT(9), /* doorbell messages */
66 	DBG_ALL		= ~0,
67 };
68 
69 #ifdef DEBUG
70 #define rmcd_debug(level, fmt, arg...)		\
71 	do {					\
72 		if (DBG_##level & dbg_level)	\
73 			pr_debug(DRV_PREFIX "%s: " fmt "\n", __func__, ##arg); \
74 	} while (0)
75 #else
76 #define rmcd_debug(level, fmt, arg...) \
77 		no_printk(KERN_DEBUG pr_fmt(DRV_PREFIX fmt "\n"), ##arg)
78 #endif
79 
80 #define rmcd_warn(fmt, arg...) \
81 	pr_warn(DRV_PREFIX "%s WARNING " fmt "\n", __func__, ##arg)
82 
83 #define rmcd_error(fmt, arg...) \
84 	pr_err(DRV_PREFIX "%s ERROR " fmt "\n", __func__, ##arg)
85 
86 MODULE_AUTHOR("Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>");
87 MODULE_AUTHOR("Aurelien Jacquiot <a-jacquiot@ti.com>");
88 MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>");
89 MODULE_AUTHOR("Andre van Herk <andre.van.herk@prodrive-technologies.com>");
90 MODULE_DESCRIPTION("RapidIO mport character device driver");
91 MODULE_LICENSE("GPL");
92 MODULE_VERSION(DRV_VERSION);
93 
94 static int dma_timeout = 3000; /* DMA transfer timeout in msec */
95 module_param(dma_timeout, int, S_IRUGO);
96 MODULE_PARM_DESC(dma_timeout, "DMA Transfer Timeout in msec (default: 3000)");
97 
98 #ifdef DEBUG
99 static u32 dbg_level = DBG_NONE;
100 module_param(dbg_level, uint, S_IWUSR | S_IWGRP | S_IRUGO);
101 MODULE_PARM_DESC(dbg_level, "Debugging output level (default 0 = none)");
102 #endif
103 
104 /*
105  * An internal DMA coherent buffer
106  */
107 struct mport_dma_buf {
108 	void		*ib_base;
109 	dma_addr_t	ib_phys;
110 	u32		ib_size;
111 	u64		ib_rio_base;
112 	bool		ib_map;
113 	struct file	*filp;
114 };
115 
116 /*
117  * Internal memory mapping structure
118  */
119 enum rio_mport_map_dir {
120 	MAP_INBOUND,
121 	MAP_OUTBOUND,
122 	MAP_DMA,
123 };
124 
125 struct rio_mport_mapping {
126 	struct list_head node;
127 	struct mport_dev *md;
128 	enum rio_mport_map_dir dir;
129 	u16 rioid;
130 	u64 rio_addr;
131 	dma_addr_t phys_addr; /* for mmap */
132 	void *virt_addr; /* kernel address, for dma_free_coherent */
133 	u64 size;
134 	struct kref ref; /* refcount of vmas sharing the mapping */
135 	struct file *filp;
136 };
137 
138 struct rio_mport_dma_map {
139 	int valid;
140 	u64 length;
141 	void *vaddr;
142 	dma_addr_t paddr;
143 };
144 
145 #define MPORT_MAX_DMA_BUFS	16
146 #define MPORT_EVENT_DEPTH	10
147 
148 /*
149  * mport_dev  driver-specific structure that represents mport device
150  * @active    mport device status flag
151  * @node      list node to maintain list of registered mports
152  * @cdev      character device
153  * @dev       associated device object
154  * @mport     associated subsystem's master port device object
155  * @buf_mutex lock for buffer handling
156  * @file_mutex - lock for open files list
157  * @file_list  - list of open files on given mport
158  * @properties properties of this mport
159  * @portwrites queue of inbound portwrites
160  * @pw_lock    lock for port write queue
161  * @mappings   queue for memory mappings
162  * @dma_chan   DMA channels associated with this device
163  * @dma_ref:
164  * @comp:
165  */
166 struct mport_dev {
167 	atomic_t		active;
168 	struct list_head	node;
169 	struct cdev		cdev;
170 	struct device		dev;
171 	struct rio_mport	*mport;
172 	struct mutex		buf_mutex;
173 	struct mutex		file_mutex;
174 	struct list_head	file_list;
175 	struct rio_mport_properties	properties;
176 	struct list_head		doorbells;
177 	spinlock_t			db_lock;
178 	struct list_head		portwrites;
179 	spinlock_t			pw_lock;
180 	struct list_head	mappings;
181 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
182 	struct dma_chan *dma_chan;
183 	struct kref	dma_ref;
184 	struct completion comp;
185 #endif
186 };
187 
188 /*
189  * mport_cdev_priv - data structure specific to individual file object
190  *                   associated with an open device
191  * @md    master port character device object
192  * @async_queue - asynchronous notification queue
193  * @list - file objects tracking list
194  * @db_filters    inbound doorbell filters for this descriptor
195  * @pw_filters    portwrite filters for this descriptor
196  * @event_fifo    event fifo for this descriptor
197  * @event_rx_wait wait queue for this descriptor
198  * @fifo_lock     lock for event_fifo
199  * @event_mask    event mask for this descriptor
200  * @dmach DMA engine channel allocated for specific file object
201  */
202 struct mport_cdev_priv {
203 	struct mport_dev	*md;
204 	struct fasync_struct	*async_queue;
205 	struct list_head	list;
206 	struct list_head	db_filters;
207 	struct list_head        pw_filters;
208 	struct kfifo            event_fifo;
209 	wait_queue_head_t       event_rx_wait;
210 	spinlock_t              fifo_lock;
211 	u32			event_mask; /* RIO_DOORBELL, RIO_PORTWRITE */
212 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
213 	struct dma_chan		*dmach;
214 	struct list_head	async_list;
215 	spinlock_t              req_lock;
216 	struct mutex		dma_lock;
217 	struct kref		dma_ref;
218 	struct completion	comp;
219 #endif
220 };
221 
222 /*
223  * rio_mport_pw_filter - structure to describe a portwrite filter
224  * md_node   node in mport device's list
225  * priv_node node in private file object's list
226  * priv      reference to private data
227  * filter    actual portwrite filter
228  */
229 struct rio_mport_pw_filter {
230 	struct list_head md_node;
231 	struct list_head priv_node;
232 	struct mport_cdev_priv *priv;
233 	struct rio_pw_filter filter;
234 };
235 
236 /*
237  * rio_mport_db_filter - structure to describe a doorbell filter
238  * @data_node reference to device node
239  * @priv_node node in private data
240  * @priv      reference to private data
241  * @filter    actual doorbell filter
242  */
243 struct rio_mport_db_filter {
244 	struct list_head data_node;
245 	struct list_head priv_node;
246 	struct mport_cdev_priv *priv;
247 	struct rio_doorbell_filter filter;
248 };
249 
250 static LIST_HEAD(mport_devs);
251 static DEFINE_MUTEX(mport_devs_lock);
252 
253 #if (0) /* used by commented out portion of poll function : FIXME */
254 static DECLARE_WAIT_QUEUE_HEAD(mport_cdev_wait);
255 #endif
256 
257 static struct class *dev_class;
258 static dev_t dev_number;
259 
260 static void mport_release_mapping(struct kref *ref);
261 
262 static int rio_mport_maint_rd(struct mport_cdev_priv *priv, void __user *arg,
263 			      int local)
264 {
265 	struct rio_mport *mport = priv->md->mport;
266 	struct rio_mport_maint_io maint_io;
267 	u32 *buffer;
268 	u32 offset;
269 	size_t length;
270 	int ret, i;
271 
272 	if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
273 		return -EFAULT;
274 
275 	if ((maint_io.offset % 4) ||
276 	    (maint_io.length == 0) || (maint_io.length % 4) ||
277 	    (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ)
278 		return -EINVAL;
279 
280 	buffer = vmalloc(maint_io.length);
281 	if (buffer == NULL)
282 		return -ENOMEM;
283 	length = maint_io.length/sizeof(u32);
284 	offset = maint_io.offset;
285 
286 	for (i = 0; i < length; i++) {
287 		if (local)
288 			ret = __rio_local_read_config_32(mport,
289 				offset, &buffer[i]);
290 		else
291 			ret = rio_mport_read_config_32(mport, maint_io.rioid,
292 				maint_io.hopcount, offset, &buffer[i]);
293 		if (ret)
294 			goto out;
295 
296 		offset += 4;
297 	}
298 
299 	if (unlikely(copy_to_user((void __user *)(uintptr_t)maint_io.buffer,
300 				   buffer, maint_io.length)))
301 		ret = -EFAULT;
302 out:
303 	vfree(buffer);
304 	return ret;
305 }
306 
307 static int rio_mport_maint_wr(struct mport_cdev_priv *priv, void __user *arg,
308 			      int local)
309 {
310 	struct rio_mport *mport = priv->md->mport;
311 	struct rio_mport_maint_io maint_io;
312 	u32 *buffer;
313 	u32 offset;
314 	size_t length;
315 	int ret = -EINVAL, i;
316 
317 	if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
318 		return -EFAULT;
319 
320 	if ((maint_io.offset % 4) ||
321 	    (maint_io.length == 0) || (maint_io.length % 4) ||
322 	    (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ)
323 		return -EINVAL;
324 
325 	buffer = vmalloc(maint_io.length);
326 	if (buffer == NULL)
327 		return -ENOMEM;
328 	length = maint_io.length;
329 
330 	if (unlikely(copy_from_user(buffer,
331 			(void __user *)(uintptr_t)maint_io.buffer, length))) {
332 		ret = -EFAULT;
333 		goto out;
334 	}
335 
336 	offset = maint_io.offset;
337 	length /= sizeof(u32);
338 
339 	for (i = 0; i < length; i++) {
340 		if (local)
341 			ret = __rio_local_write_config_32(mport,
342 							  offset, buffer[i]);
343 		else
344 			ret = rio_mport_write_config_32(mport, maint_io.rioid,
345 							maint_io.hopcount,
346 							offset, buffer[i]);
347 		if (ret)
348 			goto out;
349 
350 		offset += 4;
351 	}
352 
353 out:
354 	vfree(buffer);
355 	return ret;
356 }
357 
358 
359 /*
360  * Inbound/outbound memory mapping functions
361  */
362 static int
363 rio_mport_create_outbound_mapping(struct mport_dev *md, struct file *filp,
364 				  u16 rioid, u64 raddr, u32 size,
365 				  dma_addr_t *paddr)
366 {
367 	struct rio_mport *mport = md->mport;
368 	struct rio_mport_mapping *map;
369 	int ret;
370 
371 	rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%x", rioid, raddr, size);
372 
373 	map = kzalloc(sizeof(*map), GFP_KERNEL);
374 	if (map == NULL)
375 		return -ENOMEM;
376 
377 	ret = rio_map_outb_region(mport, rioid, raddr, size, 0, paddr);
378 	if (ret < 0)
379 		goto err_map_outb;
380 
381 	map->dir = MAP_OUTBOUND;
382 	map->rioid = rioid;
383 	map->rio_addr = raddr;
384 	map->size = size;
385 	map->phys_addr = *paddr;
386 	map->filp = filp;
387 	map->md = md;
388 	kref_init(&map->ref);
389 	list_add_tail(&map->node, &md->mappings);
390 	return 0;
391 err_map_outb:
392 	kfree(map);
393 	return ret;
394 }
395 
396 static int
397 rio_mport_get_outbound_mapping(struct mport_dev *md, struct file *filp,
398 			       u16 rioid, u64 raddr, u32 size,
399 			       dma_addr_t *paddr)
400 {
401 	struct rio_mport_mapping *map;
402 	int err = -ENOMEM;
403 
404 	mutex_lock(&md->buf_mutex);
405 	list_for_each_entry(map, &md->mappings, node) {
406 		if (map->dir != MAP_OUTBOUND)
407 			continue;
408 		if (rioid == map->rioid &&
409 		    raddr == map->rio_addr && size == map->size) {
410 			*paddr = map->phys_addr;
411 			err = 0;
412 			break;
413 		} else if (rioid == map->rioid &&
414 			   raddr < (map->rio_addr + map->size - 1) &&
415 			   (raddr + size) > map->rio_addr) {
416 			err = -EBUSY;
417 			break;
418 		}
419 	}
420 
421 	/* If not found, create new */
422 	if (err == -ENOMEM)
423 		err = rio_mport_create_outbound_mapping(md, filp, rioid, raddr,
424 						size, paddr);
425 	mutex_unlock(&md->buf_mutex);
426 	return err;
427 }
428 
429 static int rio_mport_obw_map(struct file *filp, void __user *arg)
430 {
431 	struct mport_cdev_priv *priv = filp->private_data;
432 	struct mport_dev *data = priv->md;
433 	struct rio_mmap map;
434 	dma_addr_t paddr;
435 	int ret;
436 
437 	if (unlikely(copy_from_user(&map, arg, sizeof(map))))
438 		return -EFAULT;
439 
440 	rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%llx",
441 		   map.rioid, map.rio_addr, map.length);
442 
443 	ret = rio_mport_get_outbound_mapping(data, filp, map.rioid,
444 					     map.rio_addr, map.length, &paddr);
445 	if (ret < 0) {
446 		rmcd_error("Failed to set OBW err= %d", ret);
447 		return ret;
448 	}
449 
450 	map.handle = paddr;
451 
452 	if (unlikely(copy_to_user(arg, &map, sizeof(map))))
453 		return -EFAULT;
454 	return 0;
455 }
456 
457 /*
458  * rio_mport_obw_free() - unmap an OutBound Window from RapidIO address space
459  *
460  * @priv: driver private data
461  * @arg:  buffer handle returned by allocation routine
462  */
463 static int rio_mport_obw_free(struct file *filp, void __user *arg)
464 {
465 	struct mport_cdev_priv *priv = filp->private_data;
466 	struct mport_dev *md = priv->md;
467 	u64 handle;
468 	struct rio_mport_mapping *map, *_map;
469 
470 	if (!md->mport->ops->unmap_outb)
471 		return -EPROTONOSUPPORT;
472 
473 	if (copy_from_user(&handle, arg, sizeof(handle)))
474 		return -EFAULT;
475 
476 	rmcd_debug(OBW, "h=0x%llx", handle);
477 
478 	mutex_lock(&md->buf_mutex);
479 	list_for_each_entry_safe(map, _map, &md->mappings, node) {
480 		if (map->dir == MAP_OUTBOUND && map->phys_addr == handle) {
481 			if (map->filp == filp) {
482 				rmcd_debug(OBW, "kref_put h=0x%llx", handle);
483 				map->filp = NULL;
484 				kref_put(&map->ref, mport_release_mapping);
485 			}
486 			break;
487 		}
488 	}
489 	mutex_unlock(&md->buf_mutex);
490 
491 	return 0;
492 }
493 
494 /*
495  * maint_hdid_set() - Set the host Device ID
496  * @priv: driver private data
497  * @arg:	Device Id
498  */
499 static int maint_hdid_set(struct mport_cdev_priv *priv, void __user *arg)
500 {
501 	struct mport_dev *md = priv->md;
502 	u16 hdid;
503 
504 	if (copy_from_user(&hdid, arg, sizeof(hdid)))
505 		return -EFAULT;
506 
507 	md->mport->host_deviceid = hdid;
508 	md->properties.hdid = hdid;
509 	rio_local_set_device_id(md->mport, hdid);
510 
511 	rmcd_debug(MPORT, "Set host device Id to %d", hdid);
512 
513 	return 0;
514 }
515 
516 /*
517  * maint_comptag_set() - Set the host Component Tag
518  * @priv: driver private data
519  * @arg:	Component Tag
520  */
521 static int maint_comptag_set(struct mport_cdev_priv *priv, void __user *arg)
522 {
523 	struct mport_dev *md = priv->md;
524 	u32 comptag;
525 
526 	if (copy_from_user(&comptag, arg, sizeof(comptag)))
527 		return -EFAULT;
528 
529 	rio_local_write_config_32(md->mport, RIO_COMPONENT_TAG_CSR, comptag);
530 
531 	rmcd_debug(MPORT, "Set host Component Tag to %d", comptag);
532 
533 	return 0;
534 }
535 
536 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
537 
538 struct mport_dma_req {
539 	struct kref refcount;
540 	struct list_head node;
541 	struct file *filp;
542 	struct mport_cdev_priv *priv;
543 	enum rio_transfer_sync sync;
544 	struct sg_table sgt;
545 	struct page **page_list;
546 	unsigned int nr_pages;
547 	struct rio_mport_mapping *map;
548 	struct dma_chan *dmach;
549 	enum dma_data_direction dir;
550 	dma_cookie_t cookie;
551 	enum dma_status	status;
552 	struct completion req_comp;
553 };
554 
555 static void mport_release_def_dma(struct kref *dma_ref)
556 {
557 	struct mport_dev *md =
558 			container_of(dma_ref, struct mport_dev, dma_ref);
559 
560 	rmcd_debug(EXIT, "DMA_%d", md->dma_chan->chan_id);
561 	rio_release_dma(md->dma_chan);
562 	md->dma_chan = NULL;
563 }
564 
565 static void mport_release_dma(struct kref *dma_ref)
566 {
567 	struct mport_cdev_priv *priv =
568 			container_of(dma_ref, struct mport_cdev_priv, dma_ref);
569 
570 	rmcd_debug(EXIT, "DMA_%d", priv->dmach->chan_id);
571 	complete(&priv->comp);
572 }
573 
574 static void dma_req_free(struct kref *ref)
575 {
576 	struct mport_dma_req *req = container_of(ref, struct mport_dma_req,
577 			refcount);
578 	struct mport_cdev_priv *priv = req->priv;
579 	unsigned int i;
580 
581 	dma_unmap_sg(req->dmach->device->dev,
582 		     req->sgt.sgl, req->sgt.nents, req->dir);
583 	sg_free_table(&req->sgt);
584 	if (req->page_list) {
585 		for (i = 0; i < req->nr_pages; i++)
586 			put_page(req->page_list[i]);
587 		kfree(req->page_list);
588 	}
589 
590 	if (req->map) {
591 		mutex_lock(&req->map->md->buf_mutex);
592 		kref_put(&req->map->ref, mport_release_mapping);
593 		mutex_unlock(&req->map->md->buf_mutex);
594 	}
595 
596 	kref_put(&priv->dma_ref, mport_release_dma);
597 
598 	kfree(req);
599 }
600 
601 static void dma_xfer_callback(void *param)
602 {
603 	struct mport_dma_req *req = (struct mport_dma_req *)param;
604 	struct mport_cdev_priv *priv = req->priv;
605 
606 	req->status = dma_async_is_tx_complete(priv->dmach, req->cookie,
607 					       NULL, NULL);
608 	complete(&req->req_comp);
609 	kref_put(&req->refcount, dma_req_free);
610 }
611 
612 /*
613  * prep_dma_xfer() - Configure and send request to DMAengine to prepare DMA
614  *                   transfer object.
615  * Returns pointer to DMA transaction descriptor allocated by DMA driver on
616  * success or ERR_PTR (and/or NULL) if failed. Caller must check returned
617  * non-NULL pointer using IS_ERR macro.
618  */
619 static struct dma_async_tx_descriptor
620 *prep_dma_xfer(struct dma_chan *chan, struct rio_transfer_io *transfer,
621 	struct sg_table *sgt, int nents, enum dma_transfer_direction dir,
622 	enum dma_ctrl_flags flags)
623 {
624 	struct rio_dma_data tx_data;
625 
626 	tx_data.sg = sgt->sgl;
627 	tx_data.sg_len = nents;
628 	tx_data.rio_addr_u = 0;
629 	tx_data.rio_addr = transfer->rio_addr;
630 	if (dir == DMA_MEM_TO_DEV) {
631 		switch (transfer->method) {
632 		case RIO_EXCHANGE_NWRITE:
633 			tx_data.wr_type = RDW_ALL_NWRITE;
634 			break;
635 		case RIO_EXCHANGE_NWRITE_R_ALL:
636 			tx_data.wr_type = RDW_ALL_NWRITE_R;
637 			break;
638 		case RIO_EXCHANGE_NWRITE_R:
639 			tx_data.wr_type = RDW_LAST_NWRITE_R;
640 			break;
641 		case RIO_EXCHANGE_DEFAULT:
642 			tx_data.wr_type = RDW_DEFAULT;
643 			break;
644 		default:
645 			return ERR_PTR(-EINVAL);
646 		}
647 	}
648 
649 	return rio_dma_prep_xfer(chan, transfer->rioid, &tx_data, dir, flags);
650 }
651 
652 /* Request DMA channel associated with this mport device.
653  * Try to request DMA channel for every new process that opened given
654  * mport. If a new DMA channel is not available use default channel
655  * which is the first DMA channel opened on mport device.
656  */
657 static int get_dma_channel(struct mport_cdev_priv *priv)
658 {
659 	mutex_lock(&priv->dma_lock);
660 	if (!priv->dmach) {
661 		priv->dmach = rio_request_mport_dma(priv->md->mport);
662 		if (!priv->dmach) {
663 			/* Use default DMA channel if available */
664 			if (priv->md->dma_chan) {
665 				priv->dmach = priv->md->dma_chan;
666 				kref_get(&priv->md->dma_ref);
667 			} else {
668 				rmcd_error("Failed to get DMA channel");
669 				mutex_unlock(&priv->dma_lock);
670 				return -ENODEV;
671 			}
672 		} else if (!priv->md->dma_chan) {
673 			/* Register default DMA channel if we do not have one */
674 			priv->md->dma_chan = priv->dmach;
675 			kref_init(&priv->md->dma_ref);
676 			rmcd_debug(DMA, "Register DMA_chan %d as default",
677 				   priv->dmach->chan_id);
678 		}
679 
680 		kref_init(&priv->dma_ref);
681 		init_completion(&priv->comp);
682 	}
683 
684 	kref_get(&priv->dma_ref);
685 	mutex_unlock(&priv->dma_lock);
686 	return 0;
687 }
688 
689 static void put_dma_channel(struct mport_cdev_priv *priv)
690 {
691 	kref_put(&priv->dma_ref, mport_release_dma);
692 }
693 
694 /*
695  * DMA transfer functions
696  */
697 static int do_dma_request(struct mport_dma_req *req,
698 			  struct rio_transfer_io *xfer,
699 			  enum rio_transfer_sync sync, int nents)
700 {
701 	struct mport_cdev_priv *priv;
702 	struct sg_table *sgt;
703 	struct dma_chan *chan;
704 	struct dma_async_tx_descriptor *tx;
705 	dma_cookie_t cookie;
706 	unsigned long tmo = msecs_to_jiffies(dma_timeout);
707 	enum dma_transfer_direction dir;
708 	long wret;
709 	int ret = 0;
710 
711 	priv = req->priv;
712 	sgt = &req->sgt;
713 
714 	chan = priv->dmach;
715 	dir = (req->dir == DMA_FROM_DEVICE) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
716 
717 	rmcd_debug(DMA, "%s(%d) uses %s for DMA_%s",
718 		   current->comm, task_pid_nr(current),
719 		   dev_name(&chan->dev->device),
720 		   (dir == DMA_DEV_TO_MEM)?"READ":"WRITE");
721 
722 	/* Initialize DMA transaction request */
723 	tx = prep_dma_xfer(chan, xfer, sgt, nents, dir,
724 			   DMA_CTRL_ACK | DMA_PREP_INTERRUPT);
725 
726 	if (!tx) {
727 		rmcd_debug(DMA, "prep error for %s A:0x%llx L:0x%llx",
728 			(dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
729 			xfer->rio_addr, xfer->length);
730 		ret = -EIO;
731 		goto err_out;
732 	} else if (IS_ERR(tx)) {
733 		ret = PTR_ERR(tx);
734 		rmcd_debug(DMA, "prep error %d for %s A:0x%llx L:0x%llx", ret,
735 			(dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
736 			xfer->rio_addr, xfer->length);
737 		goto err_out;
738 	}
739 
740 	tx->callback = dma_xfer_callback;
741 	tx->callback_param = req;
742 
743 	req->status = DMA_IN_PROGRESS;
744 	kref_get(&req->refcount);
745 
746 	cookie = dmaengine_submit(tx);
747 	req->cookie = cookie;
748 
749 	rmcd_debug(DMA, "pid=%d DMA_%s tx_cookie = %d", task_pid_nr(current),
750 		   (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
751 
752 	if (dma_submit_error(cookie)) {
753 		rmcd_error("submit err=%d (addr:0x%llx len:0x%llx)",
754 			   cookie, xfer->rio_addr, xfer->length);
755 		kref_put(&req->refcount, dma_req_free);
756 		ret = -EIO;
757 		goto err_out;
758 	}
759 
760 	dma_async_issue_pending(chan);
761 
762 	if (sync == RIO_TRANSFER_ASYNC) {
763 		spin_lock(&priv->req_lock);
764 		list_add_tail(&req->node, &priv->async_list);
765 		spin_unlock(&priv->req_lock);
766 		return cookie;
767 	} else if (sync == RIO_TRANSFER_FAF)
768 		return 0;
769 
770 	wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);
771 
772 	if (wret == 0) {
773 		/* Timeout on wait occurred */
774 		rmcd_error("%s(%d) timed out waiting for DMA_%s %d",
775 		       current->comm, task_pid_nr(current),
776 		       (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
777 		return -ETIMEDOUT;
778 	} else if (wret == -ERESTARTSYS) {
779 		/* Wait_for_completion was interrupted by a signal but DMA may
780 		 * be in progress
781 		 */
782 		rmcd_error("%s(%d) wait for DMA_%s %d was interrupted",
783 			current->comm, task_pid_nr(current),
784 			(dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
785 		return -EINTR;
786 	}
787 
788 	if (req->status != DMA_COMPLETE) {
789 		/* DMA transaction completion was signaled with error */
790 		rmcd_error("%s(%d) DMA_%s %d completed with status %d (ret=%d)",
791 			current->comm, task_pid_nr(current),
792 			(dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
793 			cookie, req->status, ret);
794 		ret = -EIO;
795 	}
796 
797 err_out:
798 	return ret;
799 }
800 
801 /*
802  * rio_dma_transfer() - Perform RapidIO DMA data transfer to/from
803  *                      the remote RapidIO device
804  * @filp: file pointer associated with the call
805  * @transfer_mode: DMA transfer mode
806  * @sync: synchronization mode
807  * @dir: DMA transfer direction (DMA_MEM_TO_DEV = write OR
808  *                               DMA_DEV_TO_MEM = read)
809  * @xfer: data transfer descriptor structure
810  */
811 static int
812 rio_dma_transfer(struct file *filp, u32 transfer_mode,
813 		 enum rio_transfer_sync sync, enum dma_data_direction dir,
814 		 struct rio_transfer_io *xfer)
815 {
816 	struct mport_cdev_priv *priv = filp->private_data;
817 	unsigned long nr_pages = 0;
818 	struct page **page_list = NULL;
819 	struct mport_dma_req *req;
820 	struct mport_dev *md = priv->md;
821 	struct dma_chan *chan;
822 	int i, ret;
823 	int nents;
824 
825 	if (xfer->length == 0)
826 		return -EINVAL;
827 	req = kzalloc(sizeof(*req), GFP_KERNEL);
828 	if (!req)
829 		return -ENOMEM;
830 
831 	ret = get_dma_channel(priv);
832 	if (ret) {
833 		kfree(req);
834 		return ret;
835 	}
836 	chan = priv->dmach;
837 
838 	kref_init(&req->refcount);
839 	init_completion(&req->req_comp);
840 	req->dir = dir;
841 	req->filp = filp;
842 	req->priv = priv;
843 	req->dmach = chan;
844 	req->sync = sync;
845 
846 	/*
847 	 * If parameter loc_addr != NULL, we are transferring data from/to
848 	 * data buffer allocated in user-space: lock in memory user-space
849 	 * buffer pages and build an SG table for DMA transfer request
850 	 *
851 	 * Otherwise (loc_addr == NULL) contiguous kernel-space buffer is
852 	 * used for DMA data transfers: build single entry SG table using
853 	 * offset within the internal buffer specified by handle parameter.
854 	 */
855 	if (xfer->loc_addr) {
856 		unsigned int offset;
857 		long pinned;
858 
859 		offset = lower_32_bits(offset_in_page(xfer->loc_addr));
860 		nr_pages = PAGE_ALIGN(xfer->length + offset) >> PAGE_SHIFT;
861 
862 		page_list = kmalloc_array(nr_pages,
863 					  sizeof(*page_list), GFP_KERNEL);
864 		if (page_list == NULL) {
865 			ret = -ENOMEM;
866 			goto err_req;
867 		}
868 
869 		pinned = get_user_pages_fast(
870 				(unsigned long)xfer->loc_addr & PAGE_MASK,
871 				nr_pages, dir == DMA_FROM_DEVICE, page_list);
872 
873 		if (pinned != nr_pages) {
874 			if (pinned < 0) {
875 				rmcd_error("get_user_pages_unlocked err=%ld",
876 					   pinned);
877 				nr_pages = 0;
878 			} else
879 				rmcd_error("pinned %ld out of %ld pages",
880 					   pinned, nr_pages);
881 			ret = -EFAULT;
882 			goto err_pg;
883 		}
884 
885 		ret = sg_alloc_table_from_pages(&req->sgt, page_list, nr_pages,
886 					offset, xfer->length, GFP_KERNEL);
887 		if (ret) {
888 			rmcd_error("sg_alloc_table failed with err=%d", ret);
889 			goto err_pg;
890 		}
891 
892 		req->page_list = page_list;
893 		req->nr_pages = nr_pages;
894 	} else {
895 		dma_addr_t baddr;
896 		struct rio_mport_mapping *map;
897 
898 		baddr = (dma_addr_t)xfer->handle;
899 
900 		mutex_lock(&md->buf_mutex);
901 		list_for_each_entry(map, &md->mappings, node) {
902 			if (baddr >= map->phys_addr &&
903 			    baddr < (map->phys_addr + map->size)) {
904 				kref_get(&map->ref);
905 				req->map = map;
906 				break;
907 			}
908 		}
909 		mutex_unlock(&md->buf_mutex);
910 
911 		if (req->map == NULL) {
912 			ret = -ENOMEM;
913 			goto err_req;
914 		}
915 
916 		if (xfer->length + xfer->offset > map->size) {
917 			ret = -EINVAL;
918 			goto err_req;
919 		}
920 
921 		ret = sg_alloc_table(&req->sgt, 1, GFP_KERNEL);
922 		if (unlikely(ret)) {
923 			rmcd_error("sg_alloc_table failed for internal buf");
924 			goto err_req;
925 		}
926 
927 		sg_set_buf(req->sgt.sgl,
928 			   map->virt_addr + (baddr - map->phys_addr) +
929 				xfer->offset, xfer->length);
930 	}
931 
932 	nents = dma_map_sg(chan->device->dev,
933 			   req->sgt.sgl, req->sgt.nents, dir);
934 	if (nents == 0) {
935 		rmcd_error("Failed to map SG list");
936 		ret = -EFAULT;
937 		goto err_pg;
938 	}
939 
940 	ret = do_dma_request(req, xfer, sync, nents);
941 
942 	if (ret >= 0) {
943 		if (sync == RIO_TRANSFER_ASYNC)
944 			return ret; /* return ASYNC cookie */
945 	} else {
946 		rmcd_debug(DMA, "do_dma_request failed with err=%d", ret);
947 	}
948 
949 err_pg:
950 	if (!req->page_list) {
951 		for (i = 0; i < nr_pages; i++)
952 			put_page(page_list[i]);
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 
1692 	rmcd_debug(RDEV, "name:%s ct:0x%x did:0x%x hc:0x%x", dev_info.name,
1693 		   dev_info.comptag, dev_info.destid, dev_info.hopcount);
1694 
1695 	if (bus_find_device_by_name(&rio_bus_type, NULL, dev_info.name)) {
1696 		rmcd_debug(RDEV, "device %s already exists", dev_info.name);
1697 		return -EEXIST;
1698 	}
1699 
1700 	size = sizeof(*rdev);
1701 	mport = md->mport;
1702 	destid = dev_info.destid;
1703 	hopcount = dev_info.hopcount;
1704 
1705 	if (rio_mport_read_config_32(mport, destid, hopcount,
1706 				     RIO_PEF_CAR, &rval))
1707 		return -EIO;
1708 
1709 	if (rval & RIO_PEF_SWITCH) {
1710 		rio_mport_read_config_32(mport, destid, hopcount,
1711 					 RIO_SWP_INFO_CAR, &swpinfo);
1712 		size += (RIO_GET_TOTAL_PORTS(swpinfo) *
1713 			 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
1714 	}
1715 
1716 	rdev = kzalloc(size, GFP_KERNEL);
1717 	if (rdev == NULL)
1718 		return -ENOMEM;
1719 
1720 	if (mport->net == NULL) {
1721 		struct rio_net *net;
1722 
1723 		net = rio_alloc_net(mport);
1724 		if (!net) {
1725 			err = -ENOMEM;
1726 			rmcd_debug(RDEV, "failed to allocate net object");
1727 			goto cleanup;
1728 		}
1729 
1730 		net->id = mport->id;
1731 		net->hport = mport;
1732 		dev_set_name(&net->dev, "rnet_%d", net->id);
1733 		net->dev.parent = &mport->dev;
1734 		net->dev.release = rio_release_net;
1735 		err = rio_add_net(net);
1736 		if (err) {
1737 			rmcd_debug(RDEV, "failed to register net, err=%d", err);
1738 			kfree(net);
1739 			goto cleanup;
1740 		}
1741 	}
1742 
1743 	rdev->net = mport->net;
1744 	rdev->pef = rval;
1745 	rdev->swpinfo = swpinfo;
1746 	rio_mport_read_config_32(mport, destid, hopcount,
1747 				 RIO_DEV_ID_CAR, &rval);
1748 	rdev->did = rval >> 16;
1749 	rdev->vid = rval & 0xffff;
1750 	rio_mport_read_config_32(mport, destid, hopcount, RIO_DEV_INFO_CAR,
1751 				 &rdev->device_rev);
1752 	rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_ID_CAR,
1753 				 &rval);
1754 	rdev->asm_did = rval >> 16;
1755 	rdev->asm_vid = rval & 0xffff;
1756 	rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_INFO_CAR,
1757 				 &rval);
1758 	rdev->asm_rev = rval >> 16;
1759 
1760 	if (rdev->pef & RIO_PEF_EXT_FEATURES) {
1761 		rdev->efptr = rval & 0xffff;
1762 		rdev->phys_efptr = rio_mport_get_physefb(mport, 0, destid,
1763 						hopcount, &rdev->phys_rmap);
1764 
1765 		rdev->em_efptr = rio_mport_get_feature(mport, 0, destid,
1766 						hopcount, RIO_EFB_ERR_MGMNT);
1767 	}
1768 
1769 	rio_mport_read_config_32(mport, destid, hopcount, RIO_SRC_OPS_CAR,
1770 				 &rdev->src_ops);
1771 	rio_mport_read_config_32(mport, destid, hopcount, RIO_DST_OPS_CAR,
1772 				 &rdev->dst_ops);
1773 
1774 	rdev->comp_tag = dev_info.comptag;
1775 	rdev->destid = destid;
1776 	/* hopcount is stored as specified by a caller, regardles of EP or SW */
1777 	rdev->hopcount = hopcount;
1778 
1779 	if (rdev->pef & RIO_PEF_SWITCH) {
1780 		rswitch = rdev->rswitch;
1781 		rswitch->route_table = NULL;
1782 	}
1783 
1784 	if (strlen(dev_info.name))
1785 		dev_set_name(&rdev->dev, "%s", dev_info.name);
1786 	else if (rdev->pef & RIO_PEF_SWITCH)
1787 		dev_set_name(&rdev->dev, "%02x:s:%04x", mport->id,
1788 			     rdev->comp_tag & RIO_CTAG_UDEVID);
1789 	else
1790 		dev_set_name(&rdev->dev, "%02x:e:%04x", mport->id,
1791 			     rdev->comp_tag & RIO_CTAG_UDEVID);
1792 
1793 	INIT_LIST_HEAD(&rdev->net_list);
1794 	rdev->dev.parent = &mport->net->dev;
1795 	rio_attach_device(rdev);
1796 	rdev->dev.release = rio_release_dev;
1797 
1798 	if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
1799 		rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
1800 				   0, 0xffff);
1801 	err = rio_add_device(rdev);
1802 	if (err)
1803 		goto cleanup;
1804 	rio_dev_get(rdev);
1805 
1806 	return 0;
1807 cleanup:
1808 	kfree(rdev);
1809 	return err;
1810 }
1811 
1812 static int rio_mport_del_riodev(struct mport_cdev_priv *priv, void __user *arg)
1813 {
1814 	struct rio_rdev_info dev_info;
1815 	struct rio_dev *rdev = NULL;
1816 	struct device  *dev;
1817 	struct rio_mport *mport;
1818 	struct rio_net *net;
1819 
1820 	if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1821 		return -EFAULT;
1822 
1823 	mport = priv->md->mport;
1824 
1825 	/* If device name is specified, removal by name has priority */
1826 	if (strlen(dev_info.name)) {
1827 		dev = bus_find_device_by_name(&rio_bus_type, NULL,
1828 					      dev_info.name);
1829 		if (dev)
1830 			rdev = to_rio_dev(dev);
1831 	} else {
1832 		do {
1833 			rdev = rio_get_comptag(dev_info.comptag, rdev);
1834 			if (rdev && rdev->dev.parent == &mport->net->dev &&
1835 			    rdev->destid == dev_info.destid &&
1836 			    rdev->hopcount == dev_info.hopcount)
1837 				break;
1838 		} while (rdev);
1839 	}
1840 
1841 	if (!rdev) {
1842 		rmcd_debug(RDEV,
1843 			"device name:%s ct:0x%x did:0x%x hc:0x%x not found",
1844 			dev_info.name, dev_info.comptag, dev_info.destid,
1845 			dev_info.hopcount);
1846 		return -ENODEV;
1847 	}
1848 
1849 	net = rdev->net;
1850 	rio_dev_put(rdev);
1851 	rio_del_device(rdev, RIO_DEVICE_SHUTDOWN);
1852 
1853 	if (list_empty(&net->devices)) {
1854 		rio_free_net(net);
1855 		mport->net = NULL;
1856 	}
1857 
1858 	return 0;
1859 }
1860 
1861 /*
1862  * Mport cdev management
1863  */
1864 
1865 /*
1866  * mport_cdev_open() - Open character device (mport)
1867  */
1868 static int mport_cdev_open(struct inode *inode, struct file *filp)
1869 {
1870 	int ret;
1871 	int minor = iminor(inode);
1872 	struct mport_dev *chdev;
1873 	struct mport_cdev_priv *priv;
1874 
1875 	/* Test for valid device */
1876 	if (minor >= RIO_MAX_MPORTS) {
1877 		rmcd_error("Invalid minor device number");
1878 		return -EINVAL;
1879 	}
1880 
1881 	chdev = container_of(inode->i_cdev, struct mport_dev, cdev);
1882 
1883 	rmcd_debug(INIT, "%s filp=%p", dev_name(&chdev->dev), filp);
1884 
1885 	if (atomic_read(&chdev->active) == 0)
1886 		return -ENODEV;
1887 
1888 	get_device(&chdev->dev);
1889 
1890 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1891 	if (!priv) {
1892 		put_device(&chdev->dev);
1893 		return -ENOMEM;
1894 	}
1895 
1896 	priv->md = chdev;
1897 
1898 	mutex_lock(&chdev->file_mutex);
1899 	list_add_tail(&priv->list, &chdev->file_list);
1900 	mutex_unlock(&chdev->file_mutex);
1901 
1902 	INIT_LIST_HEAD(&priv->db_filters);
1903 	INIT_LIST_HEAD(&priv->pw_filters);
1904 	spin_lock_init(&priv->fifo_lock);
1905 	init_waitqueue_head(&priv->event_rx_wait);
1906 	ret = kfifo_alloc(&priv->event_fifo,
1907 			  sizeof(struct rio_event) * MPORT_EVENT_DEPTH,
1908 			  GFP_KERNEL);
1909 	if (ret < 0) {
1910 		dev_err(&chdev->dev, DRV_NAME ": kfifo_alloc failed\n");
1911 		ret = -ENOMEM;
1912 		goto err_fifo;
1913 	}
1914 
1915 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1916 	INIT_LIST_HEAD(&priv->async_list);
1917 	spin_lock_init(&priv->req_lock);
1918 	mutex_init(&priv->dma_lock);
1919 #endif
1920 
1921 	filp->private_data = priv;
1922 	goto out;
1923 err_fifo:
1924 	kfree(priv);
1925 out:
1926 	return ret;
1927 }
1928 
1929 static int mport_cdev_fasync(int fd, struct file *filp, int mode)
1930 {
1931 	struct mport_cdev_priv *priv = filp->private_data;
1932 
1933 	return fasync_helper(fd, filp, mode, &priv->async_queue);
1934 }
1935 
1936 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1937 static void mport_cdev_release_dma(struct file *filp)
1938 {
1939 	struct mport_cdev_priv *priv = filp->private_data;
1940 	struct mport_dev *md;
1941 	struct mport_dma_req *req, *req_next;
1942 	unsigned long tmo = msecs_to_jiffies(dma_timeout);
1943 	long wret;
1944 	LIST_HEAD(list);
1945 
1946 	rmcd_debug(EXIT, "from filp=%p %s(%d)",
1947 		   filp, current->comm, task_pid_nr(current));
1948 
1949 	if (!priv->dmach) {
1950 		rmcd_debug(EXIT, "No DMA channel for filp=%p", filp);
1951 		return;
1952 	}
1953 
1954 	md = priv->md;
1955 
1956 	spin_lock(&priv->req_lock);
1957 	if (!list_empty(&priv->async_list)) {
1958 		rmcd_debug(EXIT, "async list not empty filp=%p %s(%d)",
1959 			   filp, current->comm, task_pid_nr(current));
1960 		list_splice_init(&priv->async_list, &list);
1961 	}
1962 	spin_unlock(&priv->req_lock);
1963 
1964 	if (!list_empty(&list)) {
1965 		rmcd_debug(EXIT, "temp list not empty");
1966 		list_for_each_entry_safe(req, req_next, &list, node) {
1967 			rmcd_debug(EXIT, "free req->filp=%p cookie=%d compl=%s",
1968 				   req->filp, req->cookie,
1969 				   completion_done(&req->req_comp)?"yes":"no");
1970 			list_del(&req->node);
1971 			kref_put(&req->refcount, dma_req_free);
1972 		}
1973 	}
1974 
1975 	put_dma_channel(priv);
1976 	wret = wait_for_completion_interruptible_timeout(&priv->comp, tmo);
1977 
1978 	if (wret <= 0) {
1979 		rmcd_error("%s(%d) failed waiting for DMA release err=%ld",
1980 			current->comm, task_pid_nr(current), wret);
1981 	}
1982 
1983 	if (priv->dmach != priv->md->dma_chan) {
1984 		rmcd_debug(EXIT, "Release DMA channel for filp=%p %s(%d)",
1985 			   filp, current->comm, task_pid_nr(current));
1986 		rio_release_dma(priv->dmach);
1987 	} else {
1988 		rmcd_debug(EXIT, "Adjust default DMA channel refcount");
1989 		kref_put(&md->dma_ref, mport_release_def_dma);
1990 	}
1991 
1992 	priv->dmach = NULL;
1993 }
1994 #else
1995 #define mport_cdev_release_dma(priv) do {} while (0)
1996 #endif
1997 
1998 /*
1999  * mport_cdev_release() - Release character device
2000  */
2001 static int mport_cdev_release(struct inode *inode, struct file *filp)
2002 {
2003 	struct mport_cdev_priv *priv = filp->private_data;
2004 	struct mport_dev *chdev;
2005 	struct rio_mport_pw_filter *pw_filter, *pw_filter_next;
2006 	struct rio_mport_db_filter *db_filter, *db_filter_next;
2007 	struct rio_mport_mapping *map, *_map;
2008 	unsigned long flags;
2009 
2010 	rmcd_debug(EXIT, "%s filp=%p", dev_name(&priv->md->dev), filp);
2011 
2012 	chdev = priv->md;
2013 	mport_cdev_release_dma(filp);
2014 
2015 	priv->event_mask = 0;
2016 
2017 	spin_lock_irqsave(&chdev->pw_lock, flags);
2018 	if (!list_empty(&priv->pw_filters)) {
2019 		list_for_each_entry_safe(pw_filter, pw_filter_next,
2020 					 &priv->pw_filters, priv_node)
2021 			rio_mport_delete_pw_filter(pw_filter);
2022 	}
2023 	spin_unlock_irqrestore(&chdev->pw_lock, flags);
2024 
2025 	spin_lock_irqsave(&chdev->db_lock, flags);
2026 	list_for_each_entry_safe(db_filter, db_filter_next,
2027 				 &priv->db_filters, priv_node) {
2028 		rio_mport_delete_db_filter(db_filter);
2029 	}
2030 	spin_unlock_irqrestore(&chdev->db_lock, flags);
2031 
2032 	kfifo_free(&priv->event_fifo);
2033 
2034 	mutex_lock(&chdev->buf_mutex);
2035 	list_for_each_entry_safe(map, _map, &chdev->mappings, node) {
2036 		if (map->filp == filp) {
2037 			rmcd_debug(EXIT, "release mapping %p filp=%p",
2038 				   map->virt_addr, filp);
2039 			kref_put(&map->ref, mport_release_mapping);
2040 		}
2041 	}
2042 	mutex_unlock(&chdev->buf_mutex);
2043 
2044 	mport_cdev_fasync(-1, filp, 0);
2045 	filp->private_data = NULL;
2046 	mutex_lock(&chdev->file_mutex);
2047 	list_del(&priv->list);
2048 	mutex_unlock(&chdev->file_mutex);
2049 	put_device(&chdev->dev);
2050 	kfree(priv);
2051 	return 0;
2052 }
2053 
2054 /*
2055  * mport_cdev_ioctl() - IOCTLs for character device
2056  */
2057 static long mport_cdev_ioctl(struct file *filp,
2058 		unsigned int cmd, unsigned long arg)
2059 {
2060 	int err = -EINVAL;
2061 	struct mport_cdev_priv *data = filp->private_data;
2062 	struct mport_dev *md = data->md;
2063 
2064 	if (atomic_read(&md->active) == 0)
2065 		return -ENODEV;
2066 
2067 	switch (cmd) {
2068 	case RIO_MPORT_MAINT_READ_LOCAL:
2069 		return rio_mport_maint_rd(data, (void __user *)arg, 1);
2070 	case RIO_MPORT_MAINT_WRITE_LOCAL:
2071 		return rio_mport_maint_wr(data, (void __user *)arg, 1);
2072 	case RIO_MPORT_MAINT_READ_REMOTE:
2073 		return rio_mport_maint_rd(data, (void __user *)arg, 0);
2074 	case RIO_MPORT_MAINT_WRITE_REMOTE:
2075 		return rio_mport_maint_wr(data, (void __user *)arg, 0);
2076 	case RIO_MPORT_MAINT_HDID_SET:
2077 		return maint_hdid_set(data, (void __user *)arg);
2078 	case RIO_MPORT_MAINT_COMPTAG_SET:
2079 		return maint_comptag_set(data, (void __user *)arg);
2080 	case RIO_MPORT_MAINT_PORT_IDX_GET:
2081 		return maint_port_idx_get(data, (void __user *)arg);
2082 	case RIO_MPORT_GET_PROPERTIES:
2083 		md->properties.hdid = md->mport->host_deviceid;
2084 		if (copy_to_user((void __user *)arg, &(md->properties),
2085 				 sizeof(md->properties)))
2086 			return -EFAULT;
2087 		return 0;
2088 	case RIO_ENABLE_DOORBELL_RANGE:
2089 		return rio_mport_add_db_filter(data, (void __user *)arg);
2090 	case RIO_DISABLE_DOORBELL_RANGE:
2091 		return rio_mport_remove_db_filter(data, (void __user *)arg);
2092 	case RIO_ENABLE_PORTWRITE_RANGE:
2093 		return rio_mport_add_pw_filter(data, (void __user *)arg);
2094 	case RIO_DISABLE_PORTWRITE_RANGE:
2095 		return rio_mport_remove_pw_filter(data, (void __user *)arg);
2096 	case RIO_SET_EVENT_MASK:
2097 		data->event_mask = (u32)arg;
2098 		return 0;
2099 	case RIO_GET_EVENT_MASK:
2100 		if (copy_to_user((void __user *)arg, &data->event_mask,
2101 				    sizeof(u32)))
2102 			return -EFAULT;
2103 		return 0;
2104 	case RIO_MAP_OUTBOUND:
2105 		return rio_mport_obw_map(filp, (void __user *)arg);
2106 	case RIO_MAP_INBOUND:
2107 		return rio_mport_map_inbound(filp, (void __user *)arg);
2108 	case RIO_UNMAP_OUTBOUND:
2109 		return rio_mport_obw_free(filp, (void __user *)arg);
2110 	case RIO_UNMAP_INBOUND:
2111 		return rio_mport_inbound_free(filp, (void __user *)arg);
2112 	case RIO_ALLOC_DMA:
2113 		return rio_mport_alloc_dma(filp, (void __user *)arg);
2114 	case RIO_FREE_DMA:
2115 		return rio_mport_free_dma(filp, (void __user *)arg);
2116 	case RIO_WAIT_FOR_ASYNC:
2117 		return rio_mport_wait_for_async_dma(filp, (void __user *)arg);
2118 	case RIO_TRANSFER:
2119 		return rio_mport_transfer_ioctl(filp, (void __user *)arg);
2120 	case RIO_DEV_ADD:
2121 		return rio_mport_add_riodev(data, (void __user *)arg);
2122 	case RIO_DEV_DEL:
2123 		return rio_mport_del_riodev(data, (void __user *)arg);
2124 	default:
2125 		break;
2126 	}
2127 
2128 	return err;
2129 }
2130 
2131 /*
2132  * mport_release_mapping - free mapping resources and info structure
2133  * @ref: a pointer to the kref within struct rio_mport_mapping
2134  *
2135  * NOTE: Shall be called while holding buf_mutex.
2136  */
2137 static void mport_release_mapping(struct kref *ref)
2138 {
2139 	struct rio_mport_mapping *map =
2140 			container_of(ref, struct rio_mport_mapping, ref);
2141 	struct rio_mport *mport = map->md->mport;
2142 
2143 	rmcd_debug(MMAP, "type %d mapping @ %p (phys = %pad) for %s",
2144 		   map->dir, map->virt_addr,
2145 		   &map->phys_addr, mport->name);
2146 
2147 	list_del(&map->node);
2148 
2149 	switch (map->dir) {
2150 	case MAP_INBOUND:
2151 		rio_unmap_inb_region(mport, map->phys_addr);
2152 		/* fall through */
2153 	case MAP_DMA:
2154 		dma_free_coherent(mport->dev.parent, map->size,
2155 				  map->virt_addr, map->phys_addr);
2156 		break;
2157 	case MAP_OUTBOUND:
2158 		rio_unmap_outb_region(mport, map->rioid, map->rio_addr);
2159 		break;
2160 	}
2161 	kfree(map);
2162 }
2163 
2164 static void mport_mm_open(struct vm_area_struct *vma)
2165 {
2166 	struct rio_mport_mapping *map = vma->vm_private_data;
2167 
2168 	rmcd_debug(MMAP, "%pad", &map->phys_addr);
2169 	kref_get(&map->ref);
2170 }
2171 
2172 static void mport_mm_close(struct vm_area_struct *vma)
2173 {
2174 	struct rio_mport_mapping *map = vma->vm_private_data;
2175 
2176 	rmcd_debug(MMAP, "%pad", &map->phys_addr);
2177 	mutex_lock(&map->md->buf_mutex);
2178 	kref_put(&map->ref, mport_release_mapping);
2179 	mutex_unlock(&map->md->buf_mutex);
2180 }
2181 
2182 static const struct vm_operations_struct vm_ops = {
2183 	.open =	mport_mm_open,
2184 	.close = mport_mm_close,
2185 };
2186 
2187 static int mport_cdev_mmap(struct file *filp, struct vm_area_struct *vma)
2188 {
2189 	struct mport_cdev_priv *priv = filp->private_data;
2190 	struct mport_dev *md;
2191 	size_t size = vma->vm_end - vma->vm_start;
2192 	dma_addr_t baddr;
2193 	unsigned long offset;
2194 	int found = 0, ret;
2195 	struct rio_mport_mapping *map;
2196 
2197 	rmcd_debug(MMAP, "0x%x bytes at offset 0x%lx",
2198 		   (unsigned int)size, vma->vm_pgoff);
2199 
2200 	md = priv->md;
2201 	baddr = ((dma_addr_t)vma->vm_pgoff << PAGE_SHIFT);
2202 
2203 	mutex_lock(&md->buf_mutex);
2204 	list_for_each_entry(map, &md->mappings, node) {
2205 		if (baddr >= map->phys_addr &&
2206 		    baddr < (map->phys_addr + map->size)) {
2207 			found = 1;
2208 			break;
2209 		}
2210 	}
2211 	mutex_unlock(&md->buf_mutex);
2212 
2213 	if (!found)
2214 		return -ENOMEM;
2215 
2216 	offset = baddr - map->phys_addr;
2217 
2218 	if (size + offset > map->size)
2219 		return -EINVAL;
2220 
2221 	vma->vm_pgoff = offset >> PAGE_SHIFT;
2222 	rmcd_debug(MMAP, "MMAP adjusted offset = 0x%lx", vma->vm_pgoff);
2223 
2224 	if (map->dir == MAP_INBOUND || map->dir == MAP_DMA)
2225 		ret = dma_mmap_coherent(md->mport->dev.parent, vma,
2226 				map->virt_addr, map->phys_addr, map->size);
2227 	else if (map->dir == MAP_OUTBOUND) {
2228 		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
2229 		ret = vm_iomap_memory(vma, map->phys_addr, map->size);
2230 	} else {
2231 		rmcd_error("Attempt to mmap unsupported mapping type");
2232 		ret = -EIO;
2233 	}
2234 
2235 	if (!ret) {
2236 		vma->vm_private_data = map;
2237 		vma->vm_ops = &vm_ops;
2238 		mport_mm_open(vma);
2239 	} else {
2240 		rmcd_error("MMAP exit with err=%d", ret);
2241 	}
2242 
2243 	return ret;
2244 }
2245 
2246 static __poll_t mport_cdev_poll(struct file *filp, poll_table *wait)
2247 {
2248 	struct mport_cdev_priv *priv = filp->private_data;
2249 
2250 	poll_wait(filp, &priv->event_rx_wait, wait);
2251 	if (kfifo_len(&priv->event_fifo))
2252 		return EPOLLIN | EPOLLRDNORM;
2253 
2254 	return 0;
2255 }
2256 
2257 static ssize_t mport_read(struct file *filp, char __user *buf, size_t count,
2258 			loff_t *ppos)
2259 {
2260 	struct mport_cdev_priv *priv = filp->private_data;
2261 	int copied;
2262 	ssize_t ret;
2263 
2264 	if (!count)
2265 		return 0;
2266 
2267 	if (kfifo_is_empty(&priv->event_fifo) &&
2268 	    (filp->f_flags & O_NONBLOCK))
2269 		return -EAGAIN;
2270 
2271 	if (count % sizeof(struct rio_event))
2272 		return -EINVAL;
2273 
2274 	ret = wait_event_interruptible(priv->event_rx_wait,
2275 					kfifo_len(&priv->event_fifo) != 0);
2276 	if (ret)
2277 		return ret;
2278 
2279 	while (ret < count) {
2280 		if (kfifo_to_user(&priv->event_fifo, buf,
2281 		      sizeof(struct rio_event), &copied))
2282 			return -EFAULT;
2283 		ret += copied;
2284 		buf += copied;
2285 	}
2286 
2287 	return ret;
2288 }
2289 
2290 static ssize_t mport_write(struct file *filp, const char __user *buf,
2291 			 size_t count, loff_t *ppos)
2292 {
2293 	struct mport_cdev_priv *priv = filp->private_data;
2294 	struct rio_mport *mport = priv->md->mport;
2295 	struct rio_event event;
2296 	int len, ret;
2297 
2298 	if (!count)
2299 		return 0;
2300 
2301 	if (count % sizeof(event))
2302 		return -EINVAL;
2303 
2304 	len = 0;
2305 	while ((count - len) >= (int)sizeof(event)) {
2306 		if (copy_from_user(&event, buf, sizeof(event)))
2307 			return -EFAULT;
2308 
2309 		if (event.header != RIO_DOORBELL)
2310 			return -EINVAL;
2311 
2312 		ret = rio_mport_send_doorbell(mport,
2313 					      event.u.doorbell.rioid,
2314 					      event.u.doorbell.payload);
2315 		if (ret < 0)
2316 			return ret;
2317 
2318 		len += sizeof(event);
2319 		buf += sizeof(event);
2320 	}
2321 
2322 	return len;
2323 }
2324 
2325 static const struct file_operations mport_fops = {
2326 	.owner		= THIS_MODULE,
2327 	.open		= mport_cdev_open,
2328 	.release	= mport_cdev_release,
2329 	.poll		= mport_cdev_poll,
2330 	.read		= mport_read,
2331 	.write		= mport_write,
2332 	.mmap		= mport_cdev_mmap,
2333 	.fasync		= mport_cdev_fasync,
2334 	.unlocked_ioctl = mport_cdev_ioctl
2335 };
2336 
2337 /*
2338  * Character device management
2339  */
2340 
2341 static void mport_device_release(struct device *dev)
2342 {
2343 	struct mport_dev *md;
2344 
2345 	rmcd_debug(EXIT, "%s", dev_name(dev));
2346 	md = container_of(dev, struct mport_dev, dev);
2347 	kfree(md);
2348 }
2349 
2350 /*
2351  * mport_cdev_add() - Create mport_dev from rio_mport
2352  * @mport:	RapidIO master port
2353  */
2354 static struct mport_dev *mport_cdev_add(struct rio_mport *mport)
2355 {
2356 	int ret = 0;
2357 	struct mport_dev *md;
2358 	struct rio_mport_attr attr;
2359 
2360 	md = kzalloc(sizeof(*md), GFP_KERNEL);
2361 	if (!md) {
2362 		rmcd_error("Unable allocate a device object");
2363 		return NULL;
2364 	}
2365 
2366 	md->mport = mport;
2367 	mutex_init(&md->buf_mutex);
2368 	mutex_init(&md->file_mutex);
2369 	INIT_LIST_HEAD(&md->file_list);
2370 
2371 	device_initialize(&md->dev);
2372 	md->dev.devt = MKDEV(MAJOR(dev_number), mport->id);
2373 	md->dev.class = dev_class;
2374 	md->dev.parent = &mport->dev;
2375 	md->dev.release = mport_device_release;
2376 	dev_set_name(&md->dev, DEV_NAME "%d", mport->id);
2377 	atomic_set(&md->active, 1);
2378 
2379 	cdev_init(&md->cdev, &mport_fops);
2380 	md->cdev.owner = THIS_MODULE;
2381 
2382 	ret = cdev_device_add(&md->cdev, &md->dev);
2383 	if (ret) {
2384 		rmcd_error("Failed to register mport %d (err=%d)",
2385 		       mport->id, ret);
2386 		goto err_cdev;
2387 	}
2388 
2389 	INIT_LIST_HEAD(&md->doorbells);
2390 	spin_lock_init(&md->db_lock);
2391 	INIT_LIST_HEAD(&md->portwrites);
2392 	spin_lock_init(&md->pw_lock);
2393 	INIT_LIST_HEAD(&md->mappings);
2394 
2395 	md->properties.id = mport->id;
2396 	md->properties.sys_size = mport->sys_size;
2397 	md->properties.hdid = mport->host_deviceid;
2398 	md->properties.index = mport->index;
2399 
2400 	/* The transfer_mode property will be returned through mport query
2401 	 * interface
2402 	 */
2403 #ifdef CONFIG_FSL_RIO /* for now: only on Freescale's SoCs */
2404 	md->properties.transfer_mode |= RIO_TRANSFER_MODE_MAPPED;
2405 #else
2406 	md->properties.transfer_mode |= RIO_TRANSFER_MODE_TRANSFER;
2407 #endif
2408 	ret = rio_query_mport(mport, &attr);
2409 	if (!ret) {
2410 		md->properties.flags = attr.flags;
2411 		md->properties.link_speed = attr.link_speed;
2412 		md->properties.link_width = attr.link_width;
2413 		md->properties.dma_max_sge = attr.dma_max_sge;
2414 		md->properties.dma_max_size = attr.dma_max_size;
2415 		md->properties.dma_align = attr.dma_align;
2416 		md->properties.cap_sys_size = 0;
2417 		md->properties.cap_transfer_mode = 0;
2418 		md->properties.cap_addr_size = 0;
2419 	} else
2420 		pr_info(DRV_PREFIX "Failed to obtain info for %s cdev(%d:%d)\n",
2421 			mport->name, MAJOR(dev_number), mport->id);
2422 
2423 	mutex_lock(&mport_devs_lock);
2424 	list_add_tail(&md->node, &mport_devs);
2425 	mutex_unlock(&mport_devs_lock);
2426 
2427 	pr_info(DRV_PREFIX "Added %s cdev(%d:%d)\n",
2428 		mport->name, MAJOR(dev_number), mport->id);
2429 
2430 	return md;
2431 
2432 err_cdev:
2433 	put_device(&md->dev);
2434 	return NULL;
2435 }
2436 
2437 /*
2438  * mport_cdev_terminate_dma() - Stop all active DMA data transfers and release
2439  *                              associated DMA channels.
2440  */
2441 static void mport_cdev_terminate_dma(struct mport_dev *md)
2442 {
2443 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
2444 	struct mport_cdev_priv *client;
2445 
2446 	rmcd_debug(DMA, "%s", dev_name(&md->dev));
2447 
2448 	mutex_lock(&md->file_mutex);
2449 	list_for_each_entry(client, &md->file_list, list) {
2450 		if (client->dmach) {
2451 			dmaengine_terminate_all(client->dmach);
2452 			rio_release_dma(client->dmach);
2453 		}
2454 	}
2455 	mutex_unlock(&md->file_mutex);
2456 
2457 	if (md->dma_chan) {
2458 		dmaengine_terminate_all(md->dma_chan);
2459 		rio_release_dma(md->dma_chan);
2460 		md->dma_chan = NULL;
2461 	}
2462 #endif
2463 }
2464 
2465 
2466 /*
2467  * mport_cdev_kill_fasync() - Send SIGIO signal to all processes with open
2468  *                            mport_cdev files.
2469  */
2470 static int mport_cdev_kill_fasync(struct mport_dev *md)
2471 {
2472 	unsigned int files = 0;
2473 	struct mport_cdev_priv *client;
2474 
2475 	mutex_lock(&md->file_mutex);
2476 	list_for_each_entry(client, &md->file_list, list) {
2477 		if (client->async_queue)
2478 			kill_fasync(&client->async_queue, SIGIO, POLL_HUP);
2479 		files++;
2480 	}
2481 	mutex_unlock(&md->file_mutex);
2482 	return files;
2483 }
2484 
2485 /*
2486  * mport_cdev_remove() - Remove mport character device
2487  * @dev:	Mport device to remove
2488  */
2489 static void mport_cdev_remove(struct mport_dev *md)
2490 {
2491 	struct rio_mport_mapping *map, *_map;
2492 
2493 	rmcd_debug(EXIT, "Remove %s cdev", md->mport->name);
2494 	atomic_set(&md->active, 0);
2495 	mport_cdev_terminate_dma(md);
2496 	rio_del_mport_pw_handler(md->mport, md, rio_mport_pw_handler);
2497 	cdev_device_del(&md->cdev, &md->dev);
2498 	mport_cdev_kill_fasync(md);
2499 
2500 	/* TODO: do we need to give clients some time to close file
2501 	 * descriptors? Simple wait for XX, or kref?
2502 	 */
2503 
2504 	/*
2505 	 * Release DMA buffers allocated for the mport device.
2506 	 * Disable associated inbound Rapidio requests mapping if applicable.
2507 	 */
2508 	mutex_lock(&md->buf_mutex);
2509 	list_for_each_entry_safe(map, _map, &md->mappings, node) {
2510 		kref_put(&map->ref, mport_release_mapping);
2511 	}
2512 	mutex_unlock(&md->buf_mutex);
2513 
2514 	if (!list_empty(&md->mappings))
2515 		rmcd_warn("WARNING: %s pending mappings on removal",
2516 			  md->mport->name);
2517 
2518 	rio_release_inb_dbell(md->mport, 0, 0x0fff);
2519 
2520 	put_device(&md->dev);
2521 }
2522 
2523 /*
2524  * RIO rio_mport_interface driver
2525  */
2526 
2527 /*
2528  * mport_add_mport() - Add rio_mport from LDM device struct
2529  * @dev:		Linux device model struct
2530  * @class_intf:	Linux class_interface
2531  */
2532 static int mport_add_mport(struct device *dev,
2533 		struct class_interface *class_intf)
2534 {
2535 	struct rio_mport *mport = NULL;
2536 	struct mport_dev *chdev = NULL;
2537 
2538 	mport = to_rio_mport(dev);
2539 	if (!mport)
2540 		return -ENODEV;
2541 
2542 	chdev = mport_cdev_add(mport);
2543 	if (!chdev)
2544 		return -ENODEV;
2545 
2546 	return 0;
2547 }
2548 
2549 /*
2550  * mport_remove_mport() - Remove rio_mport from global list
2551  * TODO remove device from global mport_dev list
2552  */
2553 static void mport_remove_mport(struct device *dev,
2554 		struct class_interface *class_intf)
2555 {
2556 	struct rio_mport *mport = NULL;
2557 	struct mport_dev *chdev;
2558 	int found = 0;
2559 
2560 	mport = to_rio_mport(dev);
2561 	rmcd_debug(EXIT, "Remove %s", mport->name);
2562 
2563 	mutex_lock(&mport_devs_lock);
2564 	list_for_each_entry(chdev, &mport_devs, node) {
2565 		if (chdev->mport->id == mport->id) {
2566 			atomic_set(&chdev->active, 0);
2567 			list_del(&chdev->node);
2568 			found = 1;
2569 			break;
2570 		}
2571 	}
2572 	mutex_unlock(&mport_devs_lock);
2573 
2574 	if (found)
2575 		mport_cdev_remove(chdev);
2576 }
2577 
2578 /* the rio_mport_interface is used to handle local mport devices */
2579 static struct class_interface rio_mport_interface __refdata = {
2580 	.class		= &rio_mport_class,
2581 	.add_dev	= mport_add_mport,
2582 	.remove_dev	= mport_remove_mport,
2583 };
2584 
2585 /*
2586  * Linux kernel module
2587  */
2588 
2589 /*
2590  * mport_init - Driver module loading
2591  */
2592 static int __init mport_init(void)
2593 {
2594 	int ret;
2595 
2596 	/* Create device class needed by udev */
2597 	dev_class = class_create(THIS_MODULE, DRV_NAME);
2598 	if (IS_ERR(dev_class)) {
2599 		rmcd_error("Unable to create " DRV_NAME " class");
2600 		return PTR_ERR(dev_class);
2601 	}
2602 
2603 	ret = alloc_chrdev_region(&dev_number, 0, RIO_MAX_MPORTS, DRV_NAME);
2604 	if (ret < 0)
2605 		goto err_chr;
2606 
2607 	rmcd_debug(INIT, "Registered class with major=%d", MAJOR(dev_number));
2608 
2609 	/* Register to rio_mport_interface */
2610 	ret = class_interface_register(&rio_mport_interface);
2611 	if (ret) {
2612 		rmcd_error("class_interface_register() failed, err=%d", ret);
2613 		goto err_cli;
2614 	}
2615 
2616 	return 0;
2617 
2618 err_cli:
2619 	unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2620 err_chr:
2621 	class_destroy(dev_class);
2622 	return ret;
2623 }
2624 
2625 /**
2626  * mport_exit - Driver module unloading
2627  */
2628 static void __exit mport_exit(void)
2629 {
2630 	class_interface_unregister(&rio_mport_interface);
2631 	class_destroy(dev_class);
2632 	unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2633 }
2634 
2635 module_init(mport_init);
2636 module_exit(mport_exit);
2637