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[mirror_ubuntu-hirsute-kernel.git] / drivers / rapidio / devices / rio_mport_cdev.c
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);
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