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
rio_mport_maint_rd(struct mport_cdev_priv * priv,void __user * arg,int local)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
rio_mport_maint_wr(struct mport_cdev_priv * priv,void __user * arg,int local)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
rio_mport_create_outbound_mapping(struct mport_dev * md,struct file * filp,u16 rioid,u64 raddr,u32 size,dma_addr_t * paddr)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
rio_mport_get_outbound_mapping(struct mport_dev * md,struct file * filp,u16 rioid,u64 raddr,u32 size,dma_addr_t * paddr)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
rio_mport_obw_map(struct file * filp,void __user * arg)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 */
rio_mport_obw_free(struct file * filp,void __user * arg)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 */
maint_hdid_set(struct mport_cdev_priv * priv,void __user * arg)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 */
maint_comptag_set(struct mport_cdev_priv * priv,void __user * arg)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
mport_release_def_dma(struct kref * dma_ref)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
mport_release_dma(struct kref * dma_ref)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
dma_req_free(struct kref * ref)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
dma_xfer_callback(void * param)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
prep_dma_xfer(struct dma_chan * chan,struct rio_transfer_io * transfer,struct sg_table * sgt,int nents,enum dma_transfer_direction dir,enum dma_ctrl_flags flags)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 */
get_dma_channel(struct mport_cdev_priv * priv)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
put_dma_channel(struct mport_cdev_priv * priv)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 */
do_dma_request(struct mport_dma_req * req,struct rio_transfer_io * xfer,enum rio_transfer_sync sync,int nents)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
rio_dma_transfer(struct file * filp,u32 transfer_mode,enum rio_transfer_sync sync,enum dma_data_direction dir,struct rio_transfer_io * xfer)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 /*
882 * Set nr_pages up to mean "how many pages to unpin, in
883 * the error handler:
884 */
885 nr_pages = pinned;
886 }
887 ret = -EFAULT;
888 goto err_pg;
889 }
890
891 ret = sg_alloc_table_from_pages(&req->sgt, page_list, nr_pages,
892 offset, xfer->length, GFP_KERNEL);
893 if (ret) {
894 rmcd_error("sg_alloc_table failed with err=%d", ret);
895 goto err_pg;
896 }
897
898 req->page_list = page_list;
899 req->nr_pages = nr_pages;
900 } else {
901 dma_addr_t baddr;
902 struct rio_mport_mapping *map;
903
904 baddr = (dma_addr_t)xfer->handle;
905
906 mutex_lock(&md->buf_mutex);
907 list_for_each_entry(map, &md->mappings, node) {
908 if (baddr >= map->phys_addr &&
909 baddr < (map->phys_addr + map->size)) {
910 kref_get(&map->ref);
911 req->map = map;
912 break;
913 }
914 }
915 mutex_unlock(&md->buf_mutex);
916
917 if (req->map == NULL) {
918 ret = -ENOMEM;
919 goto err_req;
920 }
921
922 if (xfer->length + xfer->offset > map->size) {
923 ret = -EINVAL;
924 goto err_req;
925 }
926
927 ret = sg_alloc_table(&req->sgt, 1, GFP_KERNEL);
928 if (unlikely(ret)) {
929 rmcd_error("sg_alloc_table failed for internal buf");
930 goto err_req;
931 }
932
933 sg_set_buf(req->sgt.sgl,
934 map->virt_addr + (baddr - map->phys_addr) +
935 xfer->offset, xfer->length);
936 }
937
938 nents = dma_map_sg(chan->device->dev,
939 req->sgt.sgl, req->sgt.nents, dir);
940 if (nents == 0) {
941 rmcd_error("Failed to map SG list");
942 ret = -EFAULT;
943 goto err_pg;
944 }
945
946 ret = do_dma_request(req, xfer, sync, nents);
947
948 if (ret >= 0) {
949 if (sync == RIO_TRANSFER_ASYNC)
950 return ret; /* return ASYNC cookie */
951 } else {
952 rmcd_debug(DMA, "do_dma_request failed with err=%d", ret);
953 }
954
955 err_pg:
956 if (!req->page_list) {
957 for (i = 0; i < nr_pages; i++)
958 put_page(page_list[i]);
959 kfree(page_list);
960 }
961 err_req:
962 kref_put(&req->refcount, dma_req_free);
963 return ret;
964 }
965
rio_mport_transfer_ioctl(struct file * filp,void __user * arg)966 static int rio_mport_transfer_ioctl(struct file *filp, void __user *arg)
967 {
968 struct mport_cdev_priv *priv = filp->private_data;
969 struct rio_transaction transaction;
970 struct rio_transfer_io *transfer;
971 enum dma_data_direction dir;
972 int i, ret = 0;
973
974 if (unlikely(copy_from_user(&transaction, arg, sizeof(transaction))))
975 return -EFAULT;
976
977 if (transaction.count != 1) /* only single transfer for now */
978 return -EINVAL;
979
980 if ((transaction.transfer_mode &
981 priv->md->properties.transfer_mode) == 0)
982 return -ENODEV;
983
984 transfer = vmalloc(array_size(sizeof(*transfer), transaction.count));
985 if (!transfer)
986 return -ENOMEM;
987
988 if (unlikely(copy_from_user(transfer,
989 (void __user *)(uintptr_t)transaction.block,
990 transaction.count * sizeof(*transfer)))) {
991 ret = -EFAULT;
992 goto out_free;
993 }
994
995 dir = (transaction.dir == RIO_TRANSFER_DIR_READ) ?
996 DMA_FROM_DEVICE : DMA_TO_DEVICE;
997 for (i = 0; i < transaction.count && ret == 0; i++)
998 ret = rio_dma_transfer(filp, transaction.transfer_mode,
999 transaction.sync, dir, &transfer[i]);
1000
1001 if (unlikely(copy_to_user((void __user *)(uintptr_t)transaction.block,
1002 transfer,
1003 transaction.count * sizeof(*transfer))))
1004 ret = -EFAULT;
1005
1006 out_free:
1007 vfree(transfer);
1008
1009 return ret;
1010 }
1011
rio_mport_wait_for_async_dma(struct file * filp,void __user * arg)1012 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1013 {
1014 struct mport_cdev_priv *priv;
1015 struct rio_async_tx_wait w_param;
1016 struct mport_dma_req *req;
1017 dma_cookie_t cookie;
1018 unsigned long tmo;
1019 long wret;
1020 int found = 0;
1021 int ret;
1022
1023 priv = (struct mport_cdev_priv *)filp->private_data;
1024
1025 if (unlikely(copy_from_user(&w_param, arg, sizeof(w_param))))
1026 return -EFAULT;
1027
1028 cookie = w_param.token;
1029 if (w_param.timeout)
1030 tmo = msecs_to_jiffies(w_param.timeout);
1031 else /* Use default DMA timeout */
1032 tmo = msecs_to_jiffies(dma_timeout);
1033
1034 spin_lock(&priv->req_lock);
1035 list_for_each_entry(req, &priv->async_list, node) {
1036 if (req->cookie == cookie) {
1037 list_del(&req->node);
1038 found = 1;
1039 break;
1040 }
1041 }
1042 spin_unlock(&priv->req_lock);
1043
1044 if (!found)
1045 return -EAGAIN;
1046
1047 wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);
1048
1049 if (wret == 0) {
1050 /* Timeout on wait occurred */
1051 rmcd_error("%s(%d) timed out waiting for ASYNC DMA_%s",
1052 current->comm, task_pid_nr(current),
1053 (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
1054 ret = -ETIMEDOUT;
1055 goto err_tmo;
1056 } else if (wret == -ERESTARTSYS) {
1057 /* Wait_for_completion was interrupted by a signal but DMA may
1058 * be still in progress
1059 */
1060 rmcd_error("%s(%d) wait for ASYNC DMA_%s was interrupted",
1061 current->comm, task_pid_nr(current),
1062 (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
1063 ret = -EINTR;
1064 goto err_tmo;
1065 }
1066
1067 if (req->status != DMA_COMPLETE) {
1068 /* DMA transaction completion signaled with transfer error */
1069 rmcd_error("%s(%d) ASYNC DMA_%s completion with status %d",
1070 current->comm, task_pid_nr(current),
1071 (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE",
1072 req->status);
1073 ret = -EIO;
1074 } else
1075 ret = 0;
1076
1077 if (req->status != DMA_IN_PROGRESS && req->status != DMA_PAUSED)
1078 kref_put(&req->refcount, dma_req_free);
1079
1080 return ret;
1081
1082 err_tmo:
1083 /* Return request back into async queue */
1084 spin_lock(&priv->req_lock);
1085 list_add_tail(&req->node, &priv->async_list);
1086 spin_unlock(&priv->req_lock);
1087 return ret;
1088 }
1089
rio_mport_create_dma_mapping(struct mport_dev * md,struct file * filp,u64 size,struct rio_mport_mapping ** mapping)1090 static int rio_mport_create_dma_mapping(struct mport_dev *md, struct file *filp,
1091 u64 size, struct rio_mport_mapping **mapping)
1092 {
1093 struct rio_mport_mapping *map;
1094
1095 map = kzalloc(sizeof(*map), GFP_KERNEL);
1096 if (map == NULL)
1097 return -ENOMEM;
1098
1099 map->virt_addr = dma_alloc_coherent(md->mport->dev.parent, size,
1100 &map->phys_addr, GFP_KERNEL);
1101 if (map->virt_addr == NULL) {
1102 kfree(map);
1103 return -ENOMEM;
1104 }
1105
1106 map->dir = MAP_DMA;
1107 map->size = size;
1108 map->filp = filp;
1109 map->md = md;
1110 kref_init(&map->ref);
1111 mutex_lock(&md->buf_mutex);
1112 list_add_tail(&map->node, &md->mappings);
1113 mutex_unlock(&md->buf_mutex);
1114 *mapping = map;
1115
1116 return 0;
1117 }
1118
rio_mport_alloc_dma(struct file * filp,void __user * arg)1119 static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1120 {
1121 struct mport_cdev_priv *priv = filp->private_data;
1122 struct mport_dev *md = priv->md;
1123 struct rio_dma_mem map;
1124 struct rio_mport_mapping *mapping = NULL;
1125 int ret;
1126
1127 if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1128 return -EFAULT;
1129
1130 ret = rio_mport_create_dma_mapping(md, filp, map.length, &mapping);
1131 if (ret)
1132 return ret;
1133
1134 map.dma_handle = mapping->phys_addr;
1135
1136 if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1137 mutex_lock(&md->buf_mutex);
1138 kref_put(&mapping->ref, mport_release_mapping);
1139 mutex_unlock(&md->buf_mutex);
1140 return -EFAULT;
1141 }
1142
1143 return 0;
1144 }
1145
rio_mport_free_dma(struct file * filp,void __user * arg)1146 static int rio_mport_free_dma(struct file *filp, void __user *arg)
1147 {
1148 struct mport_cdev_priv *priv = filp->private_data;
1149 struct mport_dev *md = priv->md;
1150 u64 handle;
1151 int ret = -EFAULT;
1152 struct rio_mport_mapping *map, *_map;
1153
1154 if (copy_from_user(&handle, arg, sizeof(handle)))
1155 return -EFAULT;
1156 rmcd_debug(EXIT, "filp=%p", filp);
1157
1158 mutex_lock(&md->buf_mutex);
1159 list_for_each_entry_safe(map, _map, &md->mappings, node) {
1160 if (map->dir == MAP_DMA && map->phys_addr == handle &&
1161 map->filp == filp) {
1162 kref_put(&map->ref, mport_release_mapping);
1163 ret = 0;
1164 break;
1165 }
1166 }
1167 mutex_unlock(&md->buf_mutex);
1168
1169 if (ret == -EFAULT) {
1170 rmcd_debug(DMA, "ERR no matching mapping");
1171 return ret;
1172 }
1173
1174 return 0;
1175 }
1176 #else
rio_mport_transfer_ioctl(struct file * filp,void * arg)1177 static int rio_mport_transfer_ioctl(struct file *filp, void *arg)
1178 {
1179 return -ENODEV;
1180 }
1181
rio_mport_wait_for_async_dma(struct file * filp,void __user * arg)1182 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1183 {
1184 return -ENODEV;
1185 }
1186
rio_mport_alloc_dma(struct file * filp,void __user * arg)1187 static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1188 {
1189 return -ENODEV;
1190 }
1191
rio_mport_free_dma(struct file * filp,void __user * arg)1192 static int rio_mport_free_dma(struct file *filp, void __user *arg)
1193 {
1194 return -ENODEV;
1195 }
1196 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1197
1198 /*
1199 * Inbound/outbound memory mapping functions
1200 */
1201
1202 static int
rio_mport_create_inbound_mapping(struct mport_dev * md,struct file * filp,u64 raddr,u64 size,struct rio_mport_mapping ** mapping)1203 rio_mport_create_inbound_mapping(struct mport_dev *md, struct file *filp,
1204 u64 raddr, u64 size,
1205 struct rio_mport_mapping **mapping)
1206 {
1207 struct rio_mport *mport = md->mport;
1208 struct rio_mport_mapping *map;
1209 int ret;
1210
1211 /* rio_map_inb_region() accepts u32 size */
1212 if (size > 0xffffffff)
1213 return -EINVAL;
1214
1215 map = kzalloc(sizeof(*map), GFP_KERNEL);
1216 if (map == NULL)
1217 return -ENOMEM;
1218
1219 map->virt_addr = dma_alloc_coherent(mport->dev.parent, size,
1220 &map->phys_addr, GFP_KERNEL);
1221 if (map->virt_addr == NULL) {
1222 ret = -ENOMEM;
1223 goto err_dma_alloc;
1224 }
1225
1226 if (raddr == RIO_MAP_ANY_ADDR)
1227 raddr = map->phys_addr;
1228 ret = rio_map_inb_region(mport, map->phys_addr, raddr, (u32)size, 0);
1229 if (ret < 0)
1230 goto err_map_inb;
1231
1232 map->dir = MAP_INBOUND;
1233 map->rio_addr = raddr;
1234 map->size = size;
1235 map->filp = filp;
1236 map->md = md;
1237 kref_init(&map->ref);
1238 mutex_lock(&md->buf_mutex);
1239 list_add_tail(&map->node, &md->mappings);
1240 mutex_unlock(&md->buf_mutex);
1241 *mapping = map;
1242 return 0;
1243
1244 err_map_inb:
1245 dma_free_coherent(mport->dev.parent, size,
1246 map->virt_addr, map->phys_addr);
1247 err_dma_alloc:
1248 kfree(map);
1249 return ret;
1250 }
1251
1252 static int
rio_mport_get_inbound_mapping(struct mport_dev * md,struct file * filp,u64 raddr,u64 size,struct rio_mport_mapping ** mapping)1253 rio_mport_get_inbound_mapping(struct mport_dev *md, struct file *filp,
1254 u64 raddr, u64 size,
1255 struct rio_mport_mapping **mapping)
1256 {
1257 struct rio_mport_mapping *map;
1258 int err = -ENOMEM;
1259
1260 if (raddr == RIO_MAP_ANY_ADDR)
1261 goto get_new;
1262
1263 mutex_lock(&md->buf_mutex);
1264 list_for_each_entry(map, &md->mappings, node) {
1265 if (map->dir != MAP_INBOUND)
1266 continue;
1267 if (raddr == map->rio_addr && size == map->size) {
1268 /* allow exact match only */
1269 *mapping = map;
1270 err = 0;
1271 break;
1272 } else if (raddr < (map->rio_addr + map->size - 1) &&
1273 (raddr + size) > map->rio_addr) {
1274 err = -EBUSY;
1275 break;
1276 }
1277 }
1278 mutex_unlock(&md->buf_mutex);
1279
1280 if (err != -ENOMEM)
1281 return err;
1282 get_new:
1283 /* not found, create new */
1284 return rio_mport_create_inbound_mapping(md, filp, raddr, size, mapping);
1285 }
1286
rio_mport_map_inbound(struct file * filp,void __user * arg)1287 static int rio_mport_map_inbound(struct file *filp, void __user *arg)
1288 {
1289 struct mport_cdev_priv *priv = filp->private_data;
1290 struct mport_dev *md = priv->md;
1291 struct rio_mmap map;
1292 struct rio_mport_mapping *mapping = NULL;
1293 int ret;
1294
1295 if (!md->mport->ops->map_inb)
1296 return -EPROTONOSUPPORT;
1297 if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1298 return -EFAULT;
1299
1300 rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1301
1302 ret = rio_mport_get_inbound_mapping(md, filp, map.rio_addr,
1303 map.length, &mapping);
1304 if (ret)
1305 return ret;
1306
1307 map.handle = mapping->phys_addr;
1308 map.rio_addr = mapping->rio_addr;
1309
1310 if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1311 /* Delete mapping if it was created by this request */
1312 if (ret == 0 && mapping->filp == filp) {
1313 mutex_lock(&md->buf_mutex);
1314 kref_put(&mapping->ref, mport_release_mapping);
1315 mutex_unlock(&md->buf_mutex);
1316 }
1317 return -EFAULT;
1318 }
1319
1320 return 0;
1321 }
1322
1323 /*
1324 * rio_mport_inbound_free() - unmap from RapidIO address space and free
1325 * previously allocated inbound DMA coherent buffer
1326 * @priv: driver private data
1327 * @arg: buffer handle returned by allocation routine
1328 */
rio_mport_inbound_free(struct file * filp,void __user * arg)1329 static int rio_mport_inbound_free(struct file *filp, void __user *arg)
1330 {
1331 struct mport_cdev_priv *priv = filp->private_data;
1332 struct mport_dev *md = priv->md;
1333 u64 handle;
1334 struct rio_mport_mapping *map, *_map;
1335
1336 rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1337
1338 if (!md->mport->ops->unmap_inb)
1339 return -EPROTONOSUPPORT;
1340
1341 if (copy_from_user(&handle, arg, sizeof(handle)))
1342 return -EFAULT;
1343
1344 mutex_lock(&md->buf_mutex);
1345 list_for_each_entry_safe(map, _map, &md->mappings, node) {
1346 if (map->dir == MAP_INBOUND && map->phys_addr == handle) {
1347 if (map->filp == filp) {
1348 map->filp = NULL;
1349 kref_put(&map->ref, mport_release_mapping);
1350 }
1351 break;
1352 }
1353 }
1354 mutex_unlock(&md->buf_mutex);
1355
1356 return 0;
1357 }
1358
1359 /*
1360 * maint_port_idx_get() - Get the port index of the mport instance
1361 * @priv: driver private data
1362 * @arg: port index
1363 */
maint_port_idx_get(struct mport_cdev_priv * priv,void __user * arg)1364 static int maint_port_idx_get(struct mport_cdev_priv *priv, void __user *arg)
1365 {
1366 struct mport_dev *md = priv->md;
1367 u32 port_idx = md->mport->index;
1368
1369 rmcd_debug(MPORT, "port_index=%d", port_idx);
1370
1371 if (copy_to_user(arg, &port_idx, sizeof(port_idx)))
1372 return -EFAULT;
1373
1374 return 0;
1375 }
1376
rio_mport_add_event(struct mport_cdev_priv * priv,struct rio_event * event)1377 static int rio_mport_add_event(struct mport_cdev_priv *priv,
1378 struct rio_event *event)
1379 {
1380 int overflow;
1381
1382 if (!(priv->event_mask & event->header))
1383 return -EACCES;
1384
1385 spin_lock(&priv->fifo_lock);
1386 overflow = kfifo_avail(&priv->event_fifo) < sizeof(*event)
1387 || kfifo_in(&priv->event_fifo, (unsigned char *)event,
1388 sizeof(*event)) != sizeof(*event);
1389 spin_unlock(&priv->fifo_lock);
1390
1391 wake_up_interruptible(&priv->event_rx_wait);
1392
1393 if (overflow) {
1394 dev_warn(&priv->md->dev, DRV_NAME ": event fifo overflow\n");
1395 return -EBUSY;
1396 }
1397
1398 return 0;
1399 }
1400
rio_mport_doorbell_handler(struct rio_mport * mport,void * dev_id,u16 src,u16 dst,u16 info)1401 static void rio_mport_doorbell_handler(struct rio_mport *mport, void *dev_id,
1402 u16 src, u16 dst, u16 info)
1403 {
1404 struct mport_dev *data = dev_id;
1405 struct mport_cdev_priv *priv;
1406 struct rio_mport_db_filter *db_filter;
1407 struct rio_event event;
1408 int handled;
1409
1410 event.header = RIO_DOORBELL;
1411 event.u.doorbell.rioid = src;
1412 event.u.doorbell.payload = info;
1413
1414 handled = 0;
1415 spin_lock(&data->db_lock);
1416 list_for_each_entry(db_filter, &data->doorbells, data_node) {
1417 if (((db_filter->filter.rioid == RIO_INVALID_DESTID ||
1418 db_filter->filter.rioid == src)) &&
1419 info >= db_filter->filter.low &&
1420 info <= db_filter->filter.high) {
1421 priv = db_filter->priv;
1422 rio_mport_add_event(priv, &event);
1423 handled = 1;
1424 }
1425 }
1426 spin_unlock(&data->db_lock);
1427
1428 if (!handled)
1429 dev_warn(&data->dev,
1430 "%s: spurious DB received from 0x%x, info=0x%04x\n",
1431 __func__, src, info);
1432 }
1433
rio_mport_add_db_filter(struct mport_cdev_priv * priv,void __user * arg)1434 static int rio_mport_add_db_filter(struct mport_cdev_priv *priv,
1435 void __user *arg)
1436 {
1437 struct mport_dev *md = priv->md;
1438 struct rio_mport_db_filter *db_filter;
1439 struct rio_doorbell_filter filter;
1440 unsigned long flags;
1441 int ret;
1442
1443 if (copy_from_user(&filter, arg, sizeof(filter)))
1444 return -EFAULT;
1445
1446 if (filter.low > filter.high)
1447 return -EINVAL;
1448
1449 ret = rio_request_inb_dbell(md->mport, md, filter.low, filter.high,
1450 rio_mport_doorbell_handler);
1451 if (ret) {
1452 rmcd_error("%s failed to register IBDB, err=%d",
1453 dev_name(&md->dev), ret);
1454 return ret;
1455 }
1456
1457 db_filter = kzalloc(sizeof(*db_filter), GFP_KERNEL);
1458 if (db_filter == NULL) {
1459 rio_release_inb_dbell(md->mport, filter.low, filter.high);
1460 return -ENOMEM;
1461 }
1462
1463 db_filter->filter = filter;
1464 db_filter->priv = priv;
1465 spin_lock_irqsave(&md->db_lock, flags);
1466 list_add_tail(&db_filter->priv_node, &priv->db_filters);
1467 list_add_tail(&db_filter->data_node, &md->doorbells);
1468 spin_unlock_irqrestore(&md->db_lock, flags);
1469
1470 return 0;
1471 }
1472
rio_mport_delete_db_filter(struct rio_mport_db_filter * db_filter)1473 static void rio_mport_delete_db_filter(struct rio_mport_db_filter *db_filter)
1474 {
1475 list_del(&db_filter->data_node);
1476 list_del(&db_filter->priv_node);
1477 kfree(db_filter);
1478 }
1479
rio_mport_remove_db_filter(struct mport_cdev_priv * priv,void __user * arg)1480 static int rio_mport_remove_db_filter(struct mport_cdev_priv *priv,
1481 void __user *arg)
1482 {
1483 struct rio_mport_db_filter *db_filter;
1484 struct rio_doorbell_filter filter;
1485 unsigned long flags;
1486 int ret = -EINVAL;
1487
1488 if (copy_from_user(&filter, arg, sizeof(filter)))
1489 return -EFAULT;
1490
1491 if (filter.low > filter.high)
1492 return -EINVAL;
1493
1494 spin_lock_irqsave(&priv->md->db_lock, flags);
1495 list_for_each_entry(db_filter, &priv->db_filters, priv_node) {
1496 if (db_filter->filter.rioid == filter.rioid &&
1497 db_filter->filter.low == filter.low &&
1498 db_filter->filter.high == filter.high) {
1499 rio_mport_delete_db_filter(db_filter);
1500 ret = 0;
1501 break;
1502 }
1503 }
1504 spin_unlock_irqrestore(&priv->md->db_lock, flags);
1505
1506 if (!ret)
1507 rio_release_inb_dbell(priv->md->mport, filter.low, filter.high);
1508
1509 return ret;
1510 }
1511
rio_mport_match_pw(union rio_pw_msg * msg,struct rio_pw_filter * filter)1512 static int rio_mport_match_pw(union rio_pw_msg *msg,
1513 struct rio_pw_filter *filter)
1514 {
1515 if ((msg->em.comptag & filter->mask) < filter->low ||
1516 (msg->em.comptag & filter->mask) > filter->high)
1517 return 0;
1518 return 1;
1519 }
1520
rio_mport_pw_handler(struct rio_mport * mport,void * context,union rio_pw_msg * msg,int step)1521 static int rio_mport_pw_handler(struct rio_mport *mport, void *context,
1522 union rio_pw_msg *msg, int step)
1523 {
1524 struct mport_dev *md = context;
1525 struct mport_cdev_priv *priv;
1526 struct rio_mport_pw_filter *pw_filter;
1527 struct rio_event event;
1528 int handled;
1529
1530 event.header = RIO_PORTWRITE;
1531 memcpy(event.u.portwrite.payload, msg->raw, RIO_PW_MSG_SIZE);
1532
1533 handled = 0;
1534 spin_lock(&md->pw_lock);
1535 list_for_each_entry(pw_filter, &md->portwrites, md_node) {
1536 if (rio_mport_match_pw(msg, &pw_filter->filter)) {
1537 priv = pw_filter->priv;
1538 rio_mport_add_event(priv, &event);
1539 handled = 1;
1540 }
1541 }
1542 spin_unlock(&md->pw_lock);
1543
1544 if (!handled) {
1545 printk_ratelimited(KERN_WARNING DRV_NAME
1546 ": mport%d received spurious PW from 0x%08x\n",
1547 mport->id, msg->em.comptag);
1548 }
1549
1550 return 0;
1551 }
1552
rio_mport_add_pw_filter(struct mport_cdev_priv * priv,void __user * arg)1553 static int rio_mport_add_pw_filter(struct mport_cdev_priv *priv,
1554 void __user *arg)
1555 {
1556 struct mport_dev *md = priv->md;
1557 struct rio_mport_pw_filter *pw_filter;
1558 struct rio_pw_filter filter;
1559 unsigned long flags;
1560 int hadd = 0;
1561
1562 if (copy_from_user(&filter, arg, sizeof(filter)))
1563 return -EFAULT;
1564
1565 pw_filter = kzalloc(sizeof(*pw_filter), GFP_KERNEL);
1566 if (pw_filter == NULL)
1567 return -ENOMEM;
1568
1569 pw_filter->filter = filter;
1570 pw_filter->priv = priv;
1571 spin_lock_irqsave(&md->pw_lock, flags);
1572 if (list_empty(&md->portwrites))
1573 hadd = 1;
1574 list_add_tail(&pw_filter->priv_node, &priv->pw_filters);
1575 list_add_tail(&pw_filter->md_node, &md->portwrites);
1576 spin_unlock_irqrestore(&md->pw_lock, flags);
1577
1578 if (hadd) {
1579 int ret;
1580
1581 ret = rio_add_mport_pw_handler(md->mport, md,
1582 rio_mport_pw_handler);
1583 if (ret) {
1584 dev_err(&md->dev,
1585 "%s: failed to add IB_PW handler, err=%d\n",
1586 __func__, ret);
1587 return ret;
1588 }
1589 rio_pw_enable(md->mport, 1);
1590 }
1591
1592 return 0;
1593 }
1594
rio_mport_delete_pw_filter(struct rio_mport_pw_filter * pw_filter)1595 static void rio_mport_delete_pw_filter(struct rio_mport_pw_filter *pw_filter)
1596 {
1597 list_del(&pw_filter->md_node);
1598 list_del(&pw_filter->priv_node);
1599 kfree(pw_filter);
1600 }
1601
rio_mport_match_pw_filter(struct rio_pw_filter * a,struct rio_pw_filter * b)1602 static int rio_mport_match_pw_filter(struct rio_pw_filter *a,
1603 struct rio_pw_filter *b)
1604 {
1605 if ((a->mask == b->mask) && (a->low == b->low) && (a->high == b->high))
1606 return 1;
1607 return 0;
1608 }
1609
rio_mport_remove_pw_filter(struct mport_cdev_priv * priv,void __user * arg)1610 static int rio_mport_remove_pw_filter(struct mport_cdev_priv *priv,
1611 void __user *arg)
1612 {
1613 struct mport_dev *md = priv->md;
1614 struct rio_mport_pw_filter *pw_filter;
1615 struct rio_pw_filter filter;
1616 unsigned long flags;
1617 int ret = -EINVAL;
1618 int hdel = 0;
1619
1620 if (copy_from_user(&filter, arg, sizeof(filter)))
1621 return -EFAULT;
1622
1623 spin_lock_irqsave(&md->pw_lock, flags);
1624 list_for_each_entry(pw_filter, &priv->pw_filters, priv_node) {
1625 if (rio_mport_match_pw_filter(&pw_filter->filter, &filter)) {
1626 rio_mport_delete_pw_filter(pw_filter);
1627 ret = 0;
1628 break;
1629 }
1630 }
1631
1632 if (list_empty(&md->portwrites))
1633 hdel = 1;
1634 spin_unlock_irqrestore(&md->pw_lock, flags);
1635
1636 if (hdel) {
1637 rio_del_mport_pw_handler(md->mport, priv->md,
1638 rio_mport_pw_handler);
1639 rio_pw_enable(md->mport, 0);
1640 }
1641
1642 return ret;
1643 }
1644
1645 /*
1646 * rio_release_dev - release routine for kernel RIO device object
1647 * @dev: kernel device object associated with a RIO device structure
1648 *
1649 * Frees a RIO device struct associated a RIO device struct.
1650 * The RIO device struct is freed.
1651 */
rio_release_dev(struct device * dev)1652 static void rio_release_dev(struct device *dev)
1653 {
1654 struct rio_dev *rdev;
1655
1656 rdev = to_rio_dev(dev);
1657 pr_info(DRV_PREFIX "%s: %s\n", __func__, rio_name(rdev));
1658 kfree(rdev);
1659 }
1660
1661
rio_release_net(struct device * dev)1662 static void rio_release_net(struct device *dev)
1663 {
1664 struct rio_net *net;
1665
1666 net = to_rio_net(dev);
1667 rmcd_debug(RDEV, "net_%d", net->id);
1668 kfree(net);
1669 }
1670
1671
1672 /*
1673 * rio_mport_add_riodev - creates a kernel RIO device object
1674 *
1675 * Allocates a RIO device data structure and initializes required fields based
1676 * on device's configuration space contents.
1677 * If the device has switch capabilities, then a switch specific portion is
1678 * allocated and configured.
1679 */
rio_mport_add_riodev(struct mport_cdev_priv * priv,void __user * arg)1680 static int rio_mport_add_riodev(struct mport_cdev_priv *priv,
1681 void __user *arg)
1682 {
1683 struct mport_dev *md = priv->md;
1684 struct rio_rdev_info dev_info;
1685 struct rio_dev *rdev;
1686 struct rio_switch *rswitch = NULL;
1687 struct rio_mport *mport;
1688 struct device *dev;
1689 size_t size;
1690 u32 rval;
1691 u32 swpinfo = 0;
1692 u16 destid;
1693 u8 hopcount;
1694 int err;
1695
1696 if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1697 return -EFAULT;
1698 dev_info.name[sizeof(dev_info.name) - 1] = '\0';
1699
1700 rmcd_debug(RDEV, "name:%s ct:0x%x did:0x%x hc:0x%x", dev_info.name,
1701 dev_info.comptag, dev_info.destid, dev_info.hopcount);
1702
1703 dev = bus_find_device_by_name(&rio_bus_type, NULL, dev_info.name);
1704 if (dev) {
1705 rmcd_debug(RDEV, "device %s already exists", dev_info.name);
1706 put_device(dev);
1707 return -EEXIST;
1708 }
1709
1710 size = sizeof(*rdev);
1711 mport = md->mport;
1712 destid = dev_info.destid;
1713 hopcount = dev_info.hopcount;
1714
1715 if (rio_mport_read_config_32(mport, destid, hopcount,
1716 RIO_PEF_CAR, &rval))
1717 return -EIO;
1718
1719 if (rval & RIO_PEF_SWITCH) {
1720 rio_mport_read_config_32(mport, destid, hopcount,
1721 RIO_SWP_INFO_CAR, &swpinfo);
1722 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
1723 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
1724 }
1725
1726 rdev = kzalloc(size, GFP_KERNEL);
1727 if (rdev == NULL)
1728 return -ENOMEM;
1729
1730 if (mport->net == NULL) {
1731 struct rio_net *net;
1732
1733 net = rio_alloc_net(mport);
1734 if (!net) {
1735 err = -ENOMEM;
1736 rmcd_debug(RDEV, "failed to allocate net object");
1737 goto cleanup;
1738 }
1739
1740 net->id = mport->id;
1741 net->hport = mport;
1742 dev_set_name(&net->dev, "rnet_%d", net->id);
1743 net->dev.parent = &mport->dev;
1744 net->dev.release = rio_release_net;
1745 err = rio_add_net(net);
1746 if (err) {
1747 rmcd_debug(RDEV, "failed to register net, err=%d", err);
1748 kfree(net);
1749 goto cleanup;
1750 }
1751 }
1752
1753 rdev->net = mport->net;
1754 rdev->pef = rval;
1755 rdev->swpinfo = swpinfo;
1756 rio_mport_read_config_32(mport, destid, hopcount,
1757 RIO_DEV_ID_CAR, &rval);
1758 rdev->did = rval >> 16;
1759 rdev->vid = rval & 0xffff;
1760 rio_mport_read_config_32(mport, destid, hopcount, RIO_DEV_INFO_CAR,
1761 &rdev->device_rev);
1762 rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_ID_CAR,
1763 &rval);
1764 rdev->asm_did = rval >> 16;
1765 rdev->asm_vid = rval & 0xffff;
1766 rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_INFO_CAR,
1767 &rval);
1768 rdev->asm_rev = rval >> 16;
1769
1770 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
1771 rdev->efptr = rval & 0xffff;
1772 rdev->phys_efptr = rio_mport_get_physefb(mport, 0, destid,
1773 hopcount, &rdev->phys_rmap);
1774
1775 rdev->em_efptr = rio_mport_get_feature(mport, 0, destid,
1776 hopcount, RIO_EFB_ERR_MGMNT);
1777 }
1778
1779 rio_mport_read_config_32(mport, destid, hopcount, RIO_SRC_OPS_CAR,
1780 &rdev->src_ops);
1781 rio_mport_read_config_32(mport, destid, hopcount, RIO_DST_OPS_CAR,
1782 &rdev->dst_ops);
1783
1784 rdev->comp_tag = dev_info.comptag;
1785 rdev->destid = destid;
1786 /* hopcount is stored as specified by a caller, regardles of EP or SW */
1787 rdev->hopcount = hopcount;
1788
1789 if (rdev->pef & RIO_PEF_SWITCH) {
1790 rswitch = rdev->rswitch;
1791 rswitch->route_table = NULL;
1792 }
1793
1794 if (strlen(dev_info.name))
1795 dev_set_name(&rdev->dev, "%s", dev_info.name);
1796 else if (rdev->pef & RIO_PEF_SWITCH)
1797 dev_set_name(&rdev->dev, "%02x:s:%04x", mport->id,
1798 rdev->comp_tag & RIO_CTAG_UDEVID);
1799 else
1800 dev_set_name(&rdev->dev, "%02x:e:%04x", mport->id,
1801 rdev->comp_tag & RIO_CTAG_UDEVID);
1802
1803 INIT_LIST_HEAD(&rdev->net_list);
1804 rdev->dev.parent = &mport->net->dev;
1805 rio_attach_device(rdev);
1806 rdev->dev.release = rio_release_dev;
1807
1808 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
1809 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
1810 0, 0xffff);
1811 err = rio_add_device(rdev);
1812 if (err)
1813 goto cleanup;
1814 rio_dev_get(rdev);
1815
1816 return 0;
1817 cleanup:
1818 kfree(rdev);
1819 return err;
1820 }
1821
rio_mport_del_riodev(struct mport_cdev_priv * priv,void __user * arg)1822 static int rio_mport_del_riodev(struct mport_cdev_priv *priv, void __user *arg)
1823 {
1824 struct rio_rdev_info dev_info;
1825 struct rio_dev *rdev = NULL;
1826 struct device *dev;
1827 struct rio_mport *mport;
1828 struct rio_net *net;
1829
1830 if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1831 return -EFAULT;
1832 dev_info.name[sizeof(dev_info.name) - 1] = '\0';
1833
1834 mport = priv->md->mport;
1835
1836 /* If device name is specified, removal by name has priority */
1837 if (strlen(dev_info.name)) {
1838 dev = bus_find_device_by_name(&rio_bus_type, NULL,
1839 dev_info.name);
1840 if (dev)
1841 rdev = to_rio_dev(dev);
1842 } else {
1843 do {
1844 rdev = rio_get_comptag(dev_info.comptag, rdev);
1845 if (rdev && rdev->dev.parent == &mport->net->dev &&
1846 rdev->destid == dev_info.destid &&
1847 rdev->hopcount == dev_info.hopcount)
1848 break;
1849 } while (rdev);
1850 }
1851
1852 if (!rdev) {
1853 rmcd_debug(RDEV,
1854 "device name:%s ct:0x%x did:0x%x hc:0x%x not found",
1855 dev_info.name, dev_info.comptag, dev_info.destid,
1856 dev_info.hopcount);
1857 return -ENODEV;
1858 }
1859
1860 net = rdev->net;
1861 rio_dev_put(rdev);
1862 rio_del_device(rdev, RIO_DEVICE_SHUTDOWN);
1863
1864 if (list_empty(&net->devices)) {
1865 rio_free_net(net);
1866 mport->net = NULL;
1867 }
1868
1869 return 0;
1870 }
1871
1872 /*
1873 * Mport cdev management
1874 */
1875
1876 /*
1877 * mport_cdev_open() - Open character device (mport)
1878 */
mport_cdev_open(struct inode * inode,struct file * filp)1879 static int mport_cdev_open(struct inode *inode, struct file *filp)
1880 {
1881 int ret;
1882 int minor = iminor(inode);
1883 struct mport_dev *chdev;
1884 struct mport_cdev_priv *priv;
1885
1886 /* Test for valid device */
1887 if (minor >= RIO_MAX_MPORTS) {
1888 rmcd_error("Invalid minor device number");
1889 return -EINVAL;
1890 }
1891
1892 chdev = container_of(inode->i_cdev, struct mport_dev, cdev);
1893
1894 rmcd_debug(INIT, "%s filp=%p", dev_name(&chdev->dev), filp);
1895
1896 if (atomic_read(&chdev->active) == 0)
1897 return -ENODEV;
1898
1899 get_device(&chdev->dev);
1900
1901 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1902 if (!priv) {
1903 put_device(&chdev->dev);
1904 return -ENOMEM;
1905 }
1906
1907 priv->md = chdev;
1908
1909 mutex_lock(&chdev->file_mutex);
1910 list_add_tail(&priv->list, &chdev->file_list);
1911 mutex_unlock(&chdev->file_mutex);
1912
1913 INIT_LIST_HEAD(&priv->db_filters);
1914 INIT_LIST_HEAD(&priv->pw_filters);
1915 spin_lock_init(&priv->fifo_lock);
1916 init_waitqueue_head(&priv->event_rx_wait);
1917 ret = kfifo_alloc(&priv->event_fifo,
1918 sizeof(struct rio_event) * MPORT_EVENT_DEPTH,
1919 GFP_KERNEL);
1920 if (ret < 0) {
1921 dev_err(&chdev->dev, DRV_NAME ": kfifo_alloc failed\n");
1922 ret = -ENOMEM;
1923 goto err_fifo;
1924 }
1925
1926 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1927 INIT_LIST_HEAD(&priv->async_list);
1928 spin_lock_init(&priv->req_lock);
1929 mutex_init(&priv->dma_lock);
1930 #endif
1931
1932 filp->private_data = priv;
1933 goto out;
1934 err_fifo:
1935 kfree(priv);
1936 out:
1937 return ret;
1938 }
1939
mport_cdev_fasync(int fd,struct file * filp,int mode)1940 static int mport_cdev_fasync(int fd, struct file *filp, int mode)
1941 {
1942 struct mport_cdev_priv *priv = filp->private_data;
1943
1944 return fasync_helper(fd, filp, mode, &priv->async_queue);
1945 }
1946
1947 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
mport_cdev_release_dma(struct file * filp)1948 static void mport_cdev_release_dma(struct file *filp)
1949 {
1950 struct mport_cdev_priv *priv = filp->private_data;
1951 struct mport_dev *md;
1952 struct mport_dma_req *req, *req_next;
1953 unsigned long tmo = msecs_to_jiffies(dma_timeout);
1954 long wret;
1955 LIST_HEAD(list);
1956
1957 rmcd_debug(EXIT, "from filp=%p %s(%d)",
1958 filp, current->comm, task_pid_nr(current));
1959
1960 if (!priv->dmach) {
1961 rmcd_debug(EXIT, "No DMA channel for filp=%p", filp);
1962 return;
1963 }
1964
1965 md = priv->md;
1966
1967 spin_lock(&priv->req_lock);
1968 if (!list_empty(&priv->async_list)) {
1969 rmcd_debug(EXIT, "async list not empty filp=%p %s(%d)",
1970 filp, current->comm, task_pid_nr(current));
1971 list_splice_init(&priv->async_list, &list);
1972 }
1973 spin_unlock(&priv->req_lock);
1974
1975 if (!list_empty(&list)) {
1976 rmcd_debug(EXIT, "temp list not empty");
1977 list_for_each_entry_safe(req, req_next, &list, node) {
1978 rmcd_debug(EXIT, "free req->filp=%p cookie=%d compl=%s",
1979 req->filp, req->cookie,
1980 completion_done(&req->req_comp)?"yes":"no");
1981 list_del(&req->node);
1982 kref_put(&req->refcount, dma_req_free);
1983 }
1984 }
1985
1986 put_dma_channel(priv);
1987 wret = wait_for_completion_interruptible_timeout(&priv->comp, tmo);
1988
1989 if (wret <= 0) {
1990 rmcd_error("%s(%d) failed waiting for DMA release err=%ld",
1991 current->comm, task_pid_nr(current), wret);
1992 }
1993
1994 if (priv->dmach != priv->md->dma_chan) {
1995 rmcd_debug(EXIT, "Release DMA channel for filp=%p %s(%d)",
1996 filp, current->comm, task_pid_nr(current));
1997 rio_release_dma(priv->dmach);
1998 } else {
1999 rmcd_debug(EXIT, "Adjust default DMA channel refcount");
2000 kref_put(&md->dma_ref, mport_release_def_dma);
2001 }
2002
2003 priv->dmach = NULL;
2004 }
2005 #else
2006 #define mport_cdev_release_dma(priv) do {} while (0)
2007 #endif
2008
2009 /*
2010 * mport_cdev_release() - Release character device
2011 */
mport_cdev_release(struct inode * inode,struct file * filp)2012 static int mport_cdev_release(struct inode *inode, struct file *filp)
2013 {
2014 struct mport_cdev_priv *priv = filp->private_data;
2015 struct mport_dev *chdev;
2016 struct rio_mport_pw_filter *pw_filter, *pw_filter_next;
2017 struct rio_mport_db_filter *db_filter, *db_filter_next;
2018 struct rio_mport_mapping *map, *_map;
2019 unsigned long flags;
2020
2021 rmcd_debug(EXIT, "%s filp=%p", dev_name(&priv->md->dev), filp);
2022
2023 chdev = priv->md;
2024 mport_cdev_release_dma(filp);
2025
2026 priv->event_mask = 0;
2027
2028 spin_lock_irqsave(&chdev->pw_lock, flags);
2029 if (!list_empty(&priv->pw_filters)) {
2030 list_for_each_entry_safe(pw_filter, pw_filter_next,
2031 &priv->pw_filters, priv_node)
2032 rio_mport_delete_pw_filter(pw_filter);
2033 }
2034 spin_unlock_irqrestore(&chdev->pw_lock, flags);
2035
2036 spin_lock_irqsave(&chdev->db_lock, flags);
2037 list_for_each_entry_safe(db_filter, db_filter_next,
2038 &priv->db_filters, priv_node) {
2039 rio_mport_delete_db_filter(db_filter);
2040 }
2041 spin_unlock_irqrestore(&chdev->db_lock, flags);
2042
2043 kfifo_free(&priv->event_fifo);
2044
2045 mutex_lock(&chdev->buf_mutex);
2046 list_for_each_entry_safe(map, _map, &chdev->mappings, node) {
2047 if (map->filp == filp) {
2048 rmcd_debug(EXIT, "release mapping %p filp=%p",
2049 map->virt_addr, filp);
2050 kref_put(&map->ref, mport_release_mapping);
2051 }
2052 }
2053 mutex_unlock(&chdev->buf_mutex);
2054
2055 mport_cdev_fasync(-1, filp, 0);
2056 filp->private_data = NULL;
2057 mutex_lock(&chdev->file_mutex);
2058 list_del(&priv->list);
2059 mutex_unlock(&chdev->file_mutex);
2060 put_device(&chdev->dev);
2061 kfree(priv);
2062 return 0;
2063 }
2064
2065 /*
2066 * mport_cdev_ioctl() - IOCTLs for character device
2067 */
mport_cdev_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)2068 static long mport_cdev_ioctl(struct file *filp,
2069 unsigned int cmd, unsigned long arg)
2070 {
2071 int err = -EINVAL;
2072 struct mport_cdev_priv *data = filp->private_data;
2073 struct mport_dev *md = data->md;
2074
2075 if (atomic_read(&md->active) == 0)
2076 return -ENODEV;
2077
2078 switch (cmd) {
2079 case RIO_MPORT_MAINT_READ_LOCAL:
2080 return rio_mport_maint_rd(data, (void __user *)arg, 1);
2081 case RIO_MPORT_MAINT_WRITE_LOCAL:
2082 return rio_mport_maint_wr(data, (void __user *)arg, 1);
2083 case RIO_MPORT_MAINT_READ_REMOTE:
2084 return rio_mport_maint_rd(data, (void __user *)arg, 0);
2085 case RIO_MPORT_MAINT_WRITE_REMOTE:
2086 return rio_mport_maint_wr(data, (void __user *)arg, 0);
2087 case RIO_MPORT_MAINT_HDID_SET:
2088 return maint_hdid_set(data, (void __user *)arg);
2089 case RIO_MPORT_MAINT_COMPTAG_SET:
2090 return maint_comptag_set(data, (void __user *)arg);
2091 case RIO_MPORT_MAINT_PORT_IDX_GET:
2092 return maint_port_idx_get(data, (void __user *)arg);
2093 case RIO_MPORT_GET_PROPERTIES:
2094 md->properties.hdid = md->mport->host_deviceid;
2095 if (copy_to_user((void __user *)arg, &(md->properties),
2096 sizeof(md->properties)))
2097 return -EFAULT;
2098 return 0;
2099 case RIO_ENABLE_DOORBELL_RANGE:
2100 return rio_mport_add_db_filter(data, (void __user *)arg);
2101 case RIO_DISABLE_DOORBELL_RANGE:
2102 return rio_mport_remove_db_filter(data, (void __user *)arg);
2103 case RIO_ENABLE_PORTWRITE_RANGE:
2104 return rio_mport_add_pw_filter(data, (void __user *)arg);
2105 case RIO_DISABLE_PORTWRITE_RANGE:
2106 return rio_mport_remove_pw_filter(data, (void __user *)arg);
2107 case RIO_SET_EVENT_MASK:
2108 data->event_mask = (u32)arg;
2109 return 0;
2110 case RIO_GET_EVENT_MASK:
2111 if (copy_to_user((void __user *)arg, &data->event_mask,
2112 sizeof(u32)))
2113 return -EFAULT;
2114 return 0;
2115 case RIO_MAP_OUTBOUND:
2116 return rio_mport_obw_map(filp, (void __user *)arg);
2117 case RIO_MAP_INBOUND:
2118 return rio_mport_map_inbound(filp, (void __user *)arg);
2119 case RIO_UNMAP_OUTBOUND:
2120 return rio_mport_obw_free(filp, (void __user *)arg);
2121 case RIO_UNMAP_INBOUND:
2122 return rio_mport_inbound_free(filp, (void __user *)arg);
2123 case RIO_ALLOC_DMA:
2124 return rio_mport_alloc_dma(filp, (void __user *)arg);
2125 case RIO_FREE_DMA:
2126 return rio_mport_free_dma(filp, (void __user *)arg);
2127 case RIO_WAIT_FOR_ASYNC:
2128 return rio_mport_wait_for_async_dma(filp, (void __user *)arg);
2129 case RIO_TRANSFER:
2130 return rio_mport_transfer_ioctl(filp, (void __user *)arg);
2131 case RIO_DEV_ADD:
2132 return rio_mport_add_riodev(data, (void __user *)arg);
2133 case RIO_DEV_DEL:
2134 return rio_mport_del_riodev(data, (void __user *)arg);
2135 default:
2136 break;
2137 }
2138
2139 return err;
2140 }
2141
2142 /*
2143 * mport_release_mapping - free mapping resources and info structure
2144 * @ref: a pointer to the kref within struct rio_mport_mapping
2145 *
2146 * NOTE: Shall be called while holding buf_mutex.
2147 */
mport_release_mapping(struct kref * ref)2148 static void mport_release_mapping(struct kref *ref)
2149 {
2150 struct rio_mport_mapping *map =
2151 container_of(ref, struct rio_mport_mapping, ref);
2152 struct rio_mport *mport = map->md->mport;
2153
2154 rmcd_debug(MMAP, "type %d mapping @ %p (phys = %pad) for %s",
2155 map->dir, map->virt_addr,
2156 &map->phys_addr, mport->name);
2157
2158 list_del(&map->node);
2159
2160 switch (map->dir) {
2161 case MAP_INBOUND:
2162 rio_unmap_inb_region(mport, map->phys_addr);
2163 case MAP_DMA:
2164 dma_free_coherent(mport->dev.parent, map->size,
2165 map->virt_addr, map->phys_addr);
2166 break;
2167 case MAP_OUTBOUND:
2168 rio_unmap_outb_region(mport, map->rioid, map->rio_addr);
2169 break;
2170 }
2171 kfree(map);
2172 }
2173
mport_mm_open(struct vm_area_struct * vma)2174 static void mport_mm_open(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 kref_get(&map->ref);
2180 }
2181
mport_mm_close(struct vm_area_struct * vma)2182 static void mport_mm_close(struct vm_area_struct *vma)
2183 {
2184 struct rio_mport_mapping *map = vma->vm_private_data;
2185
2186 rmcd_debug(MMAP, "%pad", &map->phys_addr);
2187 mutex_lock(&map->md->buf_mutex);
2188 kref_put(&map->ref, mport_release_mapping);
2189 mutex_unlock(&map->md->buf_mutex);
2190 }
2191
2192 static const struct vm_operations_struct vm_ops = {
2193 .open = mport_mm_open,
2194 .close = mport_mm_close,
2195 };
2196
mport_cdev_mmap(struct file * filp,struct vm_area_struct * vma)2197 static int mport_cdev_mmap(struct file *filp, struct vm_area_struct *vma)
2198 {
2199 struct mport_cdev_priv *priv = filp->private_data;
2200 struct mport_dev *md;
2201 size_t size = vma->vm_end - vma->vm_start;
2202 dma_addr_t baddr;
2203 unsigned long offset;
2204 int found = 0, ret;
2205 struct rio_mport_mapping *map;
2206
2207 rmcd_debug(MMAP, "0x%x bytes at offset 0x%lx",
2208 (unsigned int)size, vma->vm_pgoff);
2209
2210 md = priv->md;
2211 baddr = ((dma_addr_t)vma->vm_pgoff << PAGE_SHIFT);
2212
2213 mutex_lock(&md->buf_mutex);
2214 list_for_each_entry(map, &md->mappings, node) {
2215 if (baddr >= map->phys_addr &&
2216 baddr < (map->phys_addr + map->size)) {
2217 found = 1;
2218 break;
2219 }
2220 }
2221 mutex_unlock(&md->buf_mutex);
2222
2223 if (!found)
2224 return -ENOMEM;
2225
2226 offset = baddr - map->phys_addr;
2227
2228 if (size + offset > map->size)
2229 return -EINVAL;
2230
2231 vma->vm_pgoff = offset >> PAGE_SHIFT;
2232 rmcd_debug(MMAP, "MMAP adjusted offset = 0x%lx", vma->vm_pgoff);
2233
2234 if (map->dir == MAP_INBOUND || map->dir == MAP_DMA)
2235 ret = dma_mmap_coherent(md->mport->dev.parent, vma,
2236 map->virt_addr, map->phys_addr, map->size);
2237 else if (map->dir == MAP_OUTBOUND) {
2238 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
2239 ret = vm_iomap_memory(vma, map->phys_addr, map->size);
2240 } else {
2241 rmcd_error("Attempt to mmap unsupported mapping type");
2242 ret = -EIO;
2243 }
2244
2245 if (!ret) {
2246 vma->vm_private_data = map;
2247 vma->vm_ops = &vm_ops;
2248 mport_mm_open(vma);
2249 } else {
2250 rmcd_error("MMAP exit with err=%d", ret);
2251 }
2252
2253 return ret;
2254 }
2255
mport_cdev_poll(struct file * filp,poll_table * wait)2256 static __poll_t mport_cdev_poll(struct file *filp, poll_table *wait)
2257 {
2258 struct mport_cdev_priv *priv = filp->private_data;
2259
2260 poll_wait(filp, &priv->event_rx_wait, wait);
2261 if (kfifo_len(&priv->event_fifo))
2262 return EPOLLIN | EPOLLRDNORM;
2263
2264 return 0;
2265 }
2266
mport_read(struct file * filp,char __user * buf,size_t count,loff_t * ppos)2267 static ssize_t mport_read(struct file *filp, char __user *buf, size_t count,
2268 loff_t *ppos)
2269 {
2270 struct mport_cdev_priv *priv = filp->private_data;
2271 int copied;
2272 ssize_t ret;
2273
2274 if (!count)
2275 return 0;
2276
2277 if (kfifo_is_empty(&priv->event_fifo) &&
2278 (filp->f_flags & O_NONBLOCK))
2279 return -EAGAIN;
2280
2281 if (count % sizeof(struct rio_event))
2282 return -EINVAL;
2283
2284 ret = wait_event_interruptible(priv->event_rx_wait,
2285 kfifo_len(&priv->event_fifo) != 0);
2286 if (ret)
2287 return ret;
2288
2289 while (ret < count) {
2290 if (kfifo_to_user(&priv->event_fifo, buf,
2291 sizeof(struct rio_event), &copied))
2292 return -EFAULT;
2293 ret += copied;
2294 buf += copied;
2295 }
2296
2297 return ret;
2298 }
2299
mport_write(struct file * filp,const char __user * buf,size_t count,loff_t * ppos)2300 static ssize_t mport_write(struct file *filp, const char __user *buf,
2301 size_t count, loff_t *ppos)
2302 {
2303 struct mport_cdev_priv *priv = filp->private_data;
2304 struct rio_mport *mport = priv->md->mport;
2305 struct rio_event event;
2306 int len, ret;
2307
2308 if (!count)
2309 return 0;
2310
2311 if (count % sizeof(event))
2312 return -EINVAL;
2313
2314 len = 0;
2315 while ((count - len) >= (int)sizeof(event)) {
2316 if (copy_from_user(&event, buf, sizeof(event)))
2317 return -EFAULT;
2318
2319 if (event.header != RIO_DOORBELL)
2320 return -EINVAL;
2321
2322 ret = rio_mport_send_doorbell(mport,
2323 event.u.doorbell.rioid,
2324 event.u.doorbell.payload);
2325 if (ret < 0)
2326 return ret;
2327
2328 len += sizeof(event);
2329 buf += sizeof(event);
2330 }
2331
2332 return len;
2333 }
2334
2335 static const struct file_operations mport_fops = {
2336 .owner = THIS_MODULE,
2337 .open = mport_cdev_open,
2338 .release = mport_cdev_release,
2339 .poll = mport_cdev_poll,
2340 .read = mport_read,
2341 .write = mport_write,
2342 .mmap = mport_cdev_mmap,
2343 .fasync = mport_cdev_fasync,
2344 .unlocked_ioctl = mport_cdev_ioctl
2345 };
2346
2347 /*
2348 * Character device management
2349 */
2350
mport_device_release(struct device * dev)2351 static void mport_device_release(struct device *dev)
2352 {
2353 struct mport_dev *md;
2354
2355 rmcd_debug(EXIT, "%s", dev_name(dev));
2356 md = container_of(dev, struct mport_dev, dev);
2357 kfree(md);
2358 }
2359
2360 /*
2361 * mport_cdev_add() - Create mport_dev from rio_mport
2362 * @mport: RapidIO master port
2363 */
mport_cdev_add(struct rio_mport * mport)2364 static struct mport_dev *mport_cdev_add(struct rio_mport *mport)
2365 {
2366 int ret = 0;
2367 struct mport_dev *md;
2368 struct rio_mport_attr attr;
2369
2370 md = kzalloc(sizeof(*md), GFP_KERNEL);
2371 if (!md) {
2372 rmcd_error("Unable allocate a device object");
2373 return NULL;
2374 }
2375
2376 md->mport = mport;
2377 mutex_init(&md->buf_mutex);
2378 mutex_init(&md->file_mutex);
2379 INIT_LIST_HEAD(&md->file_list);
2380
2381 device_initialize(&md->dev);
2382 md->dev.devt = MKDEV(MAJOR(dev_number), mport->id);
2383 md->dev.class = dev_class;
2384 md->dev.parent = &mport->dev;
2385 md->dev.release = mport_device_release;
2386 dev_set_name(&md->dev, DEV_NAME "%d", mport->id);
2387 atomic_set(&md->active, 1);
2388
2389 cdev_init(&md->cdev, &mport_fops);
2390 md->cdev.owner = THIS_MODULE;
2391
2392 INIT_LIST_HEAD(&md->doorbells);
2393 spin_lock_init(&md->db_lock);
2394 INIT_LIST_HEAD(&md->portwrites);
2395 spin_lock_init(&md->pw_lock);
2396 INIT_LIST_HEAD(&md->mappings);
2397
2398 md->properties.id = mport->id;
2399 md->properties.sys_size = mport->sys_size;
2400 md->properties.hdid = mport->host_deviceid;
2401 md->properties.index = mport->index;
2402
2403 /* The transfer_mode property will be returned through mport query
2404 * interface
2405 */
2406 #ifdef CONFIG_FSL_RIO /* for now: only on Freescale's SoCs */
2407 md->properties.transfer_mode |= RIO_TRANSFER_MODE_MAPPED;
2408 #else
2409 md->properties.transfer_mode |= RIO_TRANSFER_MODE_TRANSFER;
2410 #endif
2411
2412 ret = cdev_device_add(&md->cdev, &md->dev);
2413 if (ret) {
2414 rmcd_error("Failed to register mport %d (err=%d)",
2415 mport->id, ret);
2416 goto err_cdev;
2417 }
2418 ret = rio_query_mport(mport, &attr);
2419 if (!ret) {
2420 md->properties.flags = attr.flags;
2421 md->properties.link_speed = attr.link_speed;
2422 md->properties.link_width = attr.link_width;
2423 md->properties.dma_max_sge = attr.dma_max_sge;
2424 md->properties.dma_max_size = attr.dma_max_size;
2425 md->properties.dma_align = attr.dma_align;
2426 md->properties.cap_sys_size = 0;
2427 md->properties.cap_transfer_mode = 0;
2428 md->properties.cap_addr_size = 0;
2429 } else
2430 pr_info(DRV_PREFIX "Failed to obtain info for %s cdev(%d:%d)\n",
2431 mport->name, MAJOR(dev_number), mport->id);
2432
2433 mutex_lock(&mport_devs_lock);
2434 list_add_tail(&md->node, &mport_devs);
2435 mutex_unlock(&mport_devs_lock);
2436
2437 pr_info(DRV_PREFIX "Added %s cdev(%d:%d)\n",
2438 mport->name, MAJOR(dev_number), mport->id);
2439
2440 return md;
2441
2442 err_cdev:
2443 put_device(&md->dev);
2444 return NULL;
2445 }
2446
2447 /*
2448 * mport_cdev_terminate_dma() - Stop all active DMA data transfers and release
2449 * associated DMA channels.
2450 */
mport_cdev_terminate_dma(struct mport_dev * md)2451 static void mport_cdev_terminate_dma(struct mport_dev *md)
2452 {
2453 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
2454 struct mport_cdev_priv *client;
2455
2456 rmcd_debug(DMA, "%s", dev_name(&md->dev));
2457
2458 mutex_lock(&md->file_mutex);
2459 list_for_each_entry(client, &md->file_list, list) {
2460 if (client->dmach) {
2461 dmaengine_terminate_all(client->dmach);
2462 rio_release_dma(client->dmach);
2463 }
2464 }
2465 mutex_unlock(&md->file_mutex);
2466
2467 if (md->dma_chan) {
2468 dmaengine_terminate_all(md->dma_chan);
2469 rio_release_dma(md->dma_chan);
2470 md->dma_chan = NULL;
2471 }
2472 #endif
2473 }
2474
2475
2476 /*
2477 * mport_cdev_kill_fasync() - Send SIGIO signal to all processes with open
2478 * mport_cdev files.
2479 */
mport_cdev_kill_fasync(struct mport_dev * md)2480 static int mport_cdev_kill_fasync(struct mport_dev *md)
2481 {
2482 unsigned int files = 0;
2483 struct mport_cdev_priv *client;
2484
2485 mutex_lock(&md->file_mutex);
2486 list_for_each_entry(client, &md->file_list, list) {
2487 if (client->async_queue)
2488 kill_fasync(&client->async_queue, SIGIO, POLL_HUP);
2489 files++;
2490 }
2491 mutex_unlock(&md->file_mutex);
2492 return files;
2493 }
2494
2495 /*
2496 * mport_cdev_remove() - Remove mport character device
2497 * @dev: Mport device to remove
2498 */
mport_cdev_remove(struct mport_dev * md)2499 static void mport_cdev_remove(struct mport_dev *md)
2500 {
2501 struct rio_mport_mapping *map, *_map;
2502
2503 rmcd_debug(EXIT, "Remove %s cdev", md->mport->name);
2504 atomic_set(&md->active, 0);
2505 mport_cdev_terminate_dma(md);
2506 rio_del_mport_pw_handler(md->mport, md, rio_mport_pw_handler);
2507 cdev_device_del(&md->cdev, &md->dev);
2508 mport_cdev_kill_fasync(md);
2509
2510 /* TODO: do we need to give clients some time to close file
2511 * descriptors? Simple wait for XX, or kref?
2512 */
2513
2514 /*
2515 * Release DMA buffers allocated for the mport device.
2516 * Disable associated inbound Rapidio requests mapping if applicable.
2517 */
2518 mutex_lock(&md->buf_mutex);
2519 list_for_each_entry_safe(map, _map, &md->mappings, node) {
2520 kref_put(&map->ref, mport_release_mapping);
2521 }
2522 mutex_unlock(&md->buf_mutex);
2523
2524 if (!list_empty(&md->mappings))
2525 rmcd_warn("WARNING: %s pending mappings on removal",
2526 md->mport->name);
2527
2528 rio_release_inb_dbell(md->mport, 0, 0x0fff);
2529
2530 put_device(&md->dev);
2531 }
2532
2533 /*
2534 * RIO rio_mport_interface driver
2535 */
2536
2537 /*
2538 * mport_add_mport() - Add rio_mport from LDM device struct
2539 * @dev: Linux device model struct
2540 * @class_intf: Linux class_interface
2541 */
mport_add_mport(struct device * dev,struct class_interface * class_intf)2542 static int mport_add_mport(struct device *dev,
2543 struct class_interface *class_intf)
2544 {
2545 struct rio_mport *mport = NULL;
2546 struct mport_dev *chdev = NULL;
2547
2548 mport = to_rio_mport(dev);
2549 if (!mport)
2550 return -ENODEV;
2551
2552 chdev = mport_cdev_add(mport);
2553 if (!chdev)
2554 return -ENODEV;
2555
2556 return 0;
2557 }
2558
2559 /*
2560 * mport_remove_mport() - Remove rio_mport from global list
2561 * TODO remove device from global mport_dev list
2562 */
mport_remove_mport(struct device * dev,struct class_interface * class_intf)2563 static void mport_remove_mport(struct device *dev,
2564 struct class_interface *class_intf)
2565 {
2566 struct rio_mport *mport = NULL;
2567 struct mport_dev *chdev;
2568 int found = 0;
2569
2570 mport = to_rio_mport(dev);
2571 rmcd_debug(EXIT, "Remove %s", mport->name);
2572
2573 mutex_lock(&mport_devs_lock);
2574 list_for_each_entry(chdev, &mport_devs, node) {
2575 if (chdev->mport->id == mport->id) {
2576 atomic_set(&chdev->active, 0);
2577 list_del(&chdev->node);
2578 found = 1;
2579 break;
2580 }
2581 }
2582 mutex_unlock(&mport_devs_lock);
2583
2584 if (found)
2585 mport_cdev_remove(chdev);
2586 }
2587
2588 /* the rio_mport_interface is used to handle local mport devices */
2589 static struct class_interface rio_mport_interface __refdata = {
2590 .class = &rio_mport_class,
2591 .add_dev = mport_add_mport,
2592 .remove_dev = mport_remove_mport,
2593 };
2594
2595 /*
2596 * Linux kernel module
2597 */
2598
2599 /*
2600 * mport_init - Driver module loading
2601 */
mport_init(void)2602 static int __init mport_init(void)
2603 {
2604 int ret;
2605
2606 /* Create device class needed by udev */
2607 dev_class = class_create(THIS_MODULE, DRV_NAME);
2608 if (IS_ERR(dev_class)) {
2609 rmcd_error("Unable to create " DRV_NAME " class");
2610 return PTR_ERR(dev_class);
2611 }
2612
2613 ret = alloc_chrdev_region(&dev_number, 0, RIO_MAX_MPORTS, DRV_NAME);
2614 if (ret < 0)
2615 goto err_chr;
2616
2617 rmcd_debug(INIT, "Registered class with major=%d", MAJOR(dev_number));
2618
2619 /* Register to rio_mport_interface */
2620 ret = class_interface_register(&rio_mport_interface);
2621 if (ret) {
2622 rmcd_error("class_interface_register() failed, err=%d", ret);
2623 goto err_cli;
2624 }
2625
2626 return 0;
2627
2628 err_cli:
2629 unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2630 err_chr:
2631 class_destroy(dev_class);
2632 return ret;
2633 }
2634
2635 /**
2636 * mport_exit - Driver module unloading
2637 */
mport_exit(void)2638 static void __exit mport_exit(void)
2639 {
2640 class_interface_unregister(&rio_mport_interface);
2641 class_destroy(dev_class);
2642 unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2643 }
2644
2645 module_init(mport_init);
2646 module_exit(mport_exit);
2647