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rcu: Maintain special bits at bottom of ->dynticks counter
[linux/fpc-iii.git] / drivers / rapidio / devices / rio_mport_cdev.c
blob50b617af81bd5a2d034798bfa27f2cfa8da97bde
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 struct list_head pend_list;
216 spinlock_t req_lock;
217 struct mutex dma_lock;
218 struct kref dma_ref;
219 struct completion comp;
220 #endif
221 };
222
223 /*
224 * rio_mport_pw_filter - structure to describe a portwrite filter
225 * md_node node in mport device's list
226 * priv_node node in private file object's list
227 * priv reference to private data
228 * filter actual portwrite filter
229 */
230 struct rio_mport_pw_filter {
231 struct list_head md_node;
232 struct list_head priv_node;
233 struct mport_cdev_priv *priv;
234 struct rio_pw_filter filter;
235 };
236
237 /*
238 * rio_mport_db_filter - structure to describe a doorbell filter
239 * @data_node reference to device node
240 * @priv_node node in private data
241 * @priv reference to private data
242 * @filter actual doorbell filter
243 */
244 struct rio_mport_db_filter {
245 struct list_head data_node;
246 struct list_head priv_node;
247 struct mport_cdev_priv *priv;
248 struct rio_doorbell_filter filter;
249 };
250
251 static LIST_HEAD(mport_devs);
252 static DEFINE_MUTEX(mport_devs_lock);
253
254 #if (0) /* used by commented out portion of poll function : FIXME */
255 static DECLARE_WAIT_QUEUE_HEAD(mport_cdev_wait);
256 #endif
257
258 static struct class *dev_class;
259 static dev_t dev_number;
260
261 static struct workqueue_struct *dma_wq;
262
263 static void mport_release_mapping(struct kref *ref);
264
265 static int rio_mport_maint_rd(struct mport_cdev_priv *priv, void __user *arg,
266 int local)
267 {
268 struct rio_mport *mport = priv->md->mport;
269 struct rio_mport_maint_io maint_io;
270 u32 *buffer;
271 u32 offset;
272 size_t length;
273 int ret, i;
274
275 if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
276 return -EFAULT;
277
278 if ((maint_io.offset % 4) ||
279 (maint_io.length == 0) || (maint_io.length % 4) ||
280 (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ)
281 return -EINVAL;
282
283 buffer = vmalloc(maint_io.length);
284 if (buffer == NULL)
285 return -ENOMEM;
286 length = maint_io.length/sizeof(u32);
287 offset = maint_io.offset;
288
289 for (i = 0; i < length; i++) {
290 if (local)
291 ret = __rio_local_read_config_32(mport,
292 offset, &buffer[i]);
293 else
294 ret = rio_mport_read_config_32(mport, maint_io.rioid,
295 maint_io.hopcount, offset, &buffer[i]);
296 if (ret)
297 goto out;
298
299 offset += 4;
300 }
301
302 if (unlikely(copy_to_user((void __user *)(uintptr_t)maint_io.buffer,
303 buffer, maint_io.length)))
304 ret = -EFAULT;
305 out:
306 vfree(buffer);
307 return ret;
308 }
309
310 static int rio_mport_maint_wr(struct mport_cdev_priv *priv, void __user *arg,
311 int local)
312 {
313 struct rio_mport *mport = priv->md->mport;
314 struct rio_mport_maint_io maint_io;
315 u32 *buffer;
316 u32 offset;
317 size_t length;
318 int ret = -EINVAL, i;
319
320 if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
321 return -EFAULT;
322
323 if ((maint_io.offset % 4) ||
324 (maint_io.length == 0) || (maint_io.length % 4) ||
325 (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ)
326 return -EINVAL;
327
328 buffer = vmalloc(maint_io.length);
329 if (buffer == NULL)
330 return -ENOMEM;
331 length = maint_io.length;
332
333 if (unlikely(copy_from_user(buffer,
334 (void __user *)(uintptr_t)maint_io.buffer, length))) {
335 ret = -EFAULT;
336 goto out;
337 }
338
339 offset = maint_io.offset;
340 length /= sizeof(u32);
341
342 for (i = 0; i < length; i++) {
343 if (local)
344 ret = __rio_local_write_config_32(mport,
345 offset, buffer[i]);
346 else
347 ret = rio_mport_write_config_32(mport, maint_io.rioid,
348 maint_io.hopcount,
349 offset, buffer[i]);
350 if (ret)
351 goto out;
352
353 offset += 4;
354 }
355
356 out:
357 vfree(buffer);
358 return ret;
359 }
360
361
362 /*
363 * Inbound/outbound memory mapping functions
364 */
365 static int
366 rio_mport_create_outbound_mapping(struct mport_dev *md, struct file *filp,
367 u16 rioid, u64 raddr, u32 size,
368 dma_addr_t *paddr)
369 {
370 struct rio_mport *mport = md->mport;
371 struct rio_mport_mapping *map;
372 int ret;
373
374 rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%x", rioid, raddr, size);
375
376 map = kzalloc(sizeof(*map), GFP_KERNEL);
377 if (map == NULL)
378 return -ENOMEM;
379
380 ret = rio_map_outb_region(mport, rioid, raddr, size, 0, paddr);
381 if (ret < 0)
382 goto err_map_outb;
383
384 map->dir = MAP_OUTBOUND;
385 map->rioid = rioid;
386 map->rio_addr = raddr;
387 map->size = size;
388 map->phys_addr = *paddr;
389 map->filp = filp;
390 map->md = md;
391 kref_init(&map->ref);
392 list_add_tail(&map->node, &md->mappings);
393 return 0;
394 err_map_outb:
395 kfree(map);
396 return ret;
397 }
398
399 static int
400 rio_mport_get_outbound_mapping(struct mport_dev *md, struct file *filp,
401 u16 rioid, u64 raddr, u32 size,
402 dma_addr_t *paddr)
403 {
404 struct rio_mport_mapping *map;
405 int err = -ENOMEM;
406
407 mutex_lock(&md->buf_mutex);
408 list_for_each_entry(map, &md->mappings, node) {
409 if (map->dir != MAP_OUTBOUND)
410 continue;
411 if (rioid == map->rioid &&
412 raddr == map->rio_addr && size == map->size) {
413 *paddr = map->phys_addr;
414 err = 0;
415 break;
416 } else if (rioid == map->rioid &&
417 raddr < (map->rio_addr + map->size - 1) &&
418 (raddr + size) > map->rio_addr) {
419 err = -EBUSY;
420 break;
421 }
422 }
423
424 /* If not found, create new */
425 if (err == -ENOMEM)
426 err = rio_mport_create_outbound_mapping(md, filp, rioid, raddr,
427 size, paddr);
428 mutex_unlock(&md->buf_mutex);
429 return err;
430 }
431
432 static int rio_mport_obw_map(struct file *filp, void __user *arg)
433 {
434 struct mport_cdev_priv *priv = filp->private_data;
435 struct mport_dev *data = priv->md;
436 struct rio_mmap map;
437 dma_addr_t paddr;
438 int ret;
439
440 if (unlikely(copy_from_user(&map, arg, sizeof(map))))
441 return -EFAULT;
442
443 rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%llx",
444 map.rioid, map.rio_addr, map.length);
445
446 ret = rio_mport_get_outbound_mapping(data, filp, map.rioid,
447 map.rio_addr, map.length, &paddr);
448 if (ret < 0) {
449 rmcd_error("Failed to set OBW err= %d", ret);
450 return ret;
451 }
452
453 map.handle = paddr;
454
455 if (unlikely(copy_to_user(arg, &map, sizeof(map))))
456 return -EFAULT;
457 return 0;
458 }
459
460 /*
461 * rio_mport_obw_free() - unmap an OutBound Window from RapidIO address space
462 *
463 * @priv: driver private data
464 * @arg: buffer handle returned by allocation routine
465 */
466 static int rio_mport_obw_free(struct file *filp, void __user *arg)
467 {
468 struct mport_cdev_priv *priv = filp->private_data;
469 struct mport_dev *md = priv->md;
470 u64 handle;
471 struct rio_mport_mapping *map, *_map;
472
473 if (!md->mport->ops->unmap_outb)
474 return -EPROTONOSUPPORT;
475
476 if (copy_from_user(&handle, arg, sizeof(handle)))
477 return -EFAULT;
478
479 rmcd_debug(OBW, "h=0x%llx", handle);
480
481 mutex_lock(&md->buf_mutex);
482 list_for_each_entry_safe(map, _map, &md->mappings, node) {
483 if (map->dir == MAP_OUTBOUND && map->phys_addr == handle) {
484 if (map->filp == filp) {
485 rmcd_debug(OBW, "kref_put h=0x%llx", handle);
486 map->filp = NULL;
487 kref_put(&map->ref, mport_release_mapping);
488 }
489 break;
490 }
491 }
492 mutex_unlock(&md->buf_mutex);
493
494 return 0;
495 }
496
497 /*
498 * maint_hdid_set() - Set the host Device ID
499 * @priv: driver private data
500 * @arg: Device Id
501 */
502 static int maint_hdid_set(struct mport_cdev_priv *priv, void __user *arg)
503 {
504 struct mport_dev *md = priv->md;
505 u16 hdid;
506
507 if (copy_from_user(&hdid, arg, sizeof(hdid)))
508 return -EFAULT;
509
510 md->mport->host_deviceid = hdid;
511 md->properties.hdid = hdid;
512 rio_local_set_device_id(md->mport, hdid);
513
514 rmcd_debug(MPORT, "Set host device Id to %d", hdid);
515
516 return 0;
517 }
518
519 /*
520 * maint_comptag_set() - Set the host Component Tag
521 * @priv: driver private data
522 * @arg: Component Tag
523 */
524 static int maint_comptag_set(struct mport_cdev_priv *priv, void __user *arg)
525 {
526 struct mport_dev *md = priv->md;
527 u32 comptag;
528
529 if (copy_from_user(&comptag, arg, sizeof(comptag)))
530 return -EFAULT;
531
532 rio_local_write_config_32(md->mport, RIO_COMPONENT_TAG_CSR, comptag);
533
534 rmcd_debug(MPORT, "Set host Component Tag to %d", comptag);
535
536 return 0;
537 }
538
539 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
540
541 struct mport_dma_req {
542 struct list_head node;
543 struct file *filp;
544 struct mport_cdev_priv *priv;
545 enum rio_transfer_sync sync;
546 struct sg_table sgt;
547 struct page **page_list;
548 unsigned int nr_pages;
549 struct rio_mport_mapping *map;
550 struct dma_chan *dmach;
551 enum dma_data_direction dir;
552 dma_cookie_t cookie;
553 enum dma_status status;
554 struct completion req_comp;
555 };
556
557 struct mport_faf_work {
558 struct work_struct work;
559 struct mport_dma_req *req;
560 };
561
562 static void mport_release_def_dma(struct kref *dma_ref)
563 {
564 struct mport_dev *md =
565 container_of(dma_ref, struct mport_dev, dma_ref);
566
567 rmcd_debug(EXIT, "DMA_%d", md->dma_chan->chan_id);
568 rio_release_dma(md->dma_chan);
569 md->dma_chan = NULL;
570 }
571
572 static void mport_release_dma(struct kref *dma_ref)
573 {
574 struct mport_cdev_priv *priv =
575 container_of(dma_ref, struct mport_cdev_priv, dma_ref);
576
577 rmcd_debug(EXIT, "DMA_%d", priv->dmach->chan_id);
578 complete(&priv->comp);
579 }
580
581 static void dma_req_free(struct mport_dma_req *req)
582 {
583 struct mport_cdev_priv *priv = req->priv;
584 unsigned int i;
585
586 dma_unmap_sg(req->dmach->device->dev,
587 req->sgt.sgl, req->sgt.nents, req->dir);
588 sg_free_table(&req->sgt);
589 if (req->page_list) {
590 for (i = 0; i < req->nr_pages; i++)
591 put_page(req->page_list[i]);
592 kfree(req->page_list);
593 }
594
595 if (req->map) {
596 mutex_lock(&req->map->md->buf_mutex);
597 kref_put(&req->map->ref, mport_release_mapping);
598 mutex_unlock(&req->map->md->buf_mutex);
599 }
600
601 kref_put(&priv->dma_ref, mport_release_dma);
602
603 kfree(req);
604 }
605
606 static void dma_xfer_callback(void *param)
607 {
608 struct mport_dma_req *req = (struct mport_dma_req *)param;
609 struct mport_cdev_priv *priv = req->priv;
610
611 req->status = dma_async_is_tx_complete(priv->dmach, req->cookie,
612 NULL, NULL);
613 complete(&req->req_comp);
614 }
615
616 static void dma_faf_cleanup(struct work_struct *_work)
617 {
618 struct mport_faf_work *work = container_of(_work,
619 struct mport_faf_work, work);
620 struct mport_dma_req *req = work->req;
621
622 dma_req_free(req);
623 kfree(work);
624 }
625
626 static void dma_faf_callback(void *param)
627 {
628 struct mport_dma_req *req = (struct mport_dma_req *)param;
629 struct mport_faf_work *work;
630
631 work = kmalloc(sizeof(*work), GFP_ATOMIC);
632 if (!work)
633 return;
634
635 INIT_WORK(&work->work, dma_faf_cleanup);
636 work->req = req;
637 queue_work(dma_wq, &work->work);
638 }
639
640 /*
641 * prep_dma_xfer() - Configure and send request to DMAengine to prepare DMA
642 * transfer object.
643 * Returns pointer to DMA transaction descriptor allocated by DMA driver on
644 * success or ERR_PTR (and/or NULL) if failed. Caller must check returned
645 * non-NULL pointer using IS_ERR macro.
646 */
647 static struct dma_async_tx_descriptor
648 *prep_dma_xfer(struct dma_chan *chan, struct rio_transfer_io *transfer,
649 struct sg_table *sgt, int nents, enum dma_transfer_direction dir,
650 enum dma_ctrl_flags flags)
651 {
652 struct rio_dma_data tx_data;
653
654 tx_data.sg = sgt->sgl;
655 tx_data.sg_len = nents;
656 tx_data.rio_addr_u = 0;
657 tx_data.rio_addr = transfer->rio_addr;
658 if (dir == DMA_MEM_TO_DEV) {
659 switch (transfer->method) {
660 case RIO_EXCHANGE_NWRITE:
661 tx_data.wr_type = RDW_ALL_NWRITE;
662 break;
663 case RIO_EXCHANGE_NWRITE_R_ALL:
664 tx_data.wr_type = RDW_ALL_NWRITE_R;
665 break;
666 case RIO_EXCHANGE_NWRITE_R:
667 tx_data.wr_type = RDW_LAST_NWRITE_R;
668 break;
669 case RIO_EXCHANGE_DEFAULT:
670 tx_data.wr_type = RDW_DEFAULT;
671 break;
672 default:
673 return ERR_PTR(-EINVAL);
674 }
675 }
676
677 return rio_dma_prep_xfer(chan, transfer->rioid, &tx_data, dir, flags);
678 }
679
680 /* Request DMA channel associated with this mport device.
681 * Try to request DMA channel for every new process that opened given
682 * mport. If a new DMA channel is not available use default channel
683 * which is the first DMA channel opened on mport device.
684 */
685 static int get_dma_channel(struct mport_cdev_priv *priv)
686 {
687 mutex_lock(&priv->dma_lock);
688 if (!priv->dmach) {
689 priv->dmach = rio_request_mport_dma(priv->md->mport);
690 if (!priv->dmach) {
691 /* Use default DMA channel if available */
692 if (priv->md->dma_chan) {
693 priv->dmach = priv->md->dma_chan;
694 kref_get(&priv->md->dma_ref);
695 } else {
696 rmcd_error("Failed to get DMA channel");
697 mutex_unlock(&priv->dma_lock);
698 return -ENODEV;
699 }
700 } else if (!priv->md->dma_chan) {
701 /* Register default DMA channel if we do not have one */
702 priv->md->dma_chan = priv->dmach;
703 kref_init(&priv->md->dma_ref);
704 rmcd_debug(DMA, "Register DMA_chan %d as default",
705 priv->dmach->chan_id);
706 }
707
708 kref_init(&priv->dma_ref);
709 init_completion(&priv->comp);
710 }
711
712 kref_get(&priv->dma_ref);
713 mutex_unlock(&priv->dma_lock);
714 return 0;
715 }
716
717 static void put_dma_channel(struct mport_cdev_priv *priv)
718 {
719 kref_put(&priv->dma_ref, mport_release_dma);
720 }
721
722 /*
723 * DMA transfer functions
724 */
725 static int do_dma_request(struct mport_dma_req *req,
726 struct rio_transfer_io *xfer,
727 enum rio_transfer_sync sync, int nents)
728 {
729 struct mport_cdev_priv *priv;
730 struct sg_table *sgt;
731 struct dma_chan *chan;
732 struct dma_async_tx_descriptor *tx;
733 dma_cookie_t cookie;
734 unsigned long tmo = msecs_to_jiffies(dma_timeout);
735 enum dma_transfer_direction dir;
736 long wret;
737 int ret = 0;
738
739 priv = req->priv;
740 sgt = &req->sgt;
741
742 chan = priv->dmach;
743 dir = (req->dir == DMA_FROM_DEVICE) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
744
745 rmcd_debug(DMA, "%s(%d) uses %s for DMA_%s",
746 current->comm, task_pid_nr(current),
747 dev_name(&chan->dev->device),
748 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE");
749
750 /* Initialize DMA transaction request */
751 tx = prep_dma_xfer(chan, xfer, sgt, nents, dir,
752 DMA_CTRL_ACK | DMA_PREP_INTERRUPT);
753
754 if (!tx) {
755 rmcd_debug(DMA, "prep error for %s A:0x%llx L:0x%llx",
756 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
757 xfer->rio_addr, xfer->length);
758 ret = -EIO;
759 goto err_out;
760 } else if (IS_ERR(tx)) {
761 ret = PTR_ERR(tx);
762 rmcd_debug(DMA, "prep error %d for %s A:0x%llx L:0x%llx", ret,
763 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
764 xfer->rio_addr, xfer->length);
765 goto err_out;
766 }
767
768 if (sync == RIO_TRANSFER_FAF)
769 tx->callback = dma_faf_callback;
770 else
771 tx->callback = dma_xfer_callback;
772 tx->callback_param = req;
773
774 req->dmach = chan;
775 req->sync = sync;
776 req->status = DMA_IN_PROGRESS;
777 init_completion(&req->req_comp);
778
779 cookie = dmaengine_submit(tx);
780 req->cookie = cookie;
781
782 rmcd_debug(DMA, "pid=%d DMA_%s tx_cookie = %d", task_pid_nr(current),
783 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
784
785 if (dma_submit_error(cookie)) {
786 rmcd_error("submit err=%d (addr:0x%llx len:0x%llx)",
787 cookie, xfer->rio_addr, xfer->length);
788 ret = -EIO;
789 goto err_out;
790 }
791
792 dma_async_issue_pending(chan);
793
794 if (sync == RIO_TRANSFER_ASYNC) {
795 spin_lock(&priv->req_lock);
796 list_add_tail(&req->node, &priv->async_list);
797 spin_unlock(&priv->req_lock);
798 return cookie;
799 } else if (sync == RIO_TRANSFER_FAF)
800 return 0;
801
802 wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);
803
804 if (wret == 0) {
805 /* Timeout on wait occurred */
806 rmcd_error("%s(%d) timed out waiting for DMA_%s %d",
807 current->comm, task_pid_nr(current),
808 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
809 return -ETIMEDOUT;
810 } else if (wret == -ERESTARTSYS) {
811 /* Wait_for_completion was interrupted by a signal but DMA may
812 * be in progress
813 */
814 rmcd_error("%s(%d) wait for DMA_%s %d was interrupted",
815 current->comm, task_pid_nr(current),
816 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
817 return -EINTR;
818 }
819
820 if (req->status != DMA_COMPLETE) {
821 /* DMA transaction completion was signaled with error */
822 rmcd_error("%s(%d) DMA_%s %d completed with status %d (ret=%d)",
823 current->comm, task_pid_nr(current),
824 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
825 cookie, req->status, ret);
826 ret = -EIO;
827 }
828
829 err_out:
830 return ret;
831 }
832
833 /*
834 * rio_dma_transfer() - Perform RapidIO DMA data transfer to/from
835 * the remote RapidIO device
836 * @filp: file pointer associated with the call
837 * @transfer_mode: DMA transfer mode
838 * @sync: synchronization mode
839 * @dir: DMA transfer direction (DMA_MEM_TO_DEV = write OR
840 * DMA_DEV_TO_MEM = read)
841 * @xfer: data transfer descriptor structure
842 */
843 static int
844 rio_dma_transfer(struct file *filp, u32 transfer_mode,
845 enum rio_transfer_sync sync, enum dma_data_direction dir,
846 struct rio_transfer_io *xfer)
847 {
848 struct mport_cdev_priv *priv = filp->private_data;
849 unsigned long nr_pages = 0;
850 struct page **page_list = NULL;
851 struct mport_dma_req *req;
852 struct mport_dev *md = priv->md;
853 struct dma_chan *chan;
854 int i, ret;
855 int nents;
856
857 if (xfer->length == 0)
858 return -EINVAL;
859 req = kzalloc(sizeof(*req), GFP_KERNEL);
860 if (!req)
861 return -ENOMEM;
862
863 ret = get_dma_channel(priv);
864 if (ret) {
865 kfree(req);
866 return ret;
867 }
868
869 /*
870 * If parameter loc_addr != NULL, we are transferring data from/to
871 * data buffer allocated in user-space: lock in memory user-space
872 * buffer pages and build an SG table for DMA transfer request
873 *
874 * Otherwise (loc_addr == NULL) contiguous kernel-space buffer is
875 * used for DMA data transfers: build single entry SG table using
876 * offset within the internal buffer specified by handle parameter.
877 */
878 if (xfer->loc_addr) {
879 unsigned long offset;
880 long pinned;
881
882 offset = (unsigned long)(uintptr_t)xfer->loc_addr & ~PAGE_MASK;
883 nr_pages = PAGE_ALIGN(xfer->length + offset) >> PAGE_SHIFT;
884
885 page_list = kmalloc_array(nr_pages,
886 sizeof(*page_list), GFP_KERNEL);
887 if (page_list == NULL) {
888 ret = -ENOMEM;
889 goto err_req;
890 }
891
892 pinned = get_user_pages_unlocked(
893 (unsigned long)xfer->loc_addr & PAGE_MASK,
894 nr_pages,
895 page_list,
896 dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0);
897
898 if (pinned != nr_pages) {
899 if (pinned < 0) {
900 rmcd_error("get_user_pages_unlocked err=%ld",
901 pinned);
902 nr_pages = 0;
903 } else
904 rmcd_error("pinned %ld out of %ld pages",
905 pinned, nr_pages);
906 ret = -EFAULT;
907 goto err_pg;
908 }
909
910 ret = sg_alloc_table_from_pages(&req->sgt, page_list, nr_pages,
911 offset, xfer->length, GFP_KERNEL);
912 if (ret) {
913 rmcd_error("sg_alloc_table failed with err=%d", ret);
914 goto err_pg;
915 }
916
917 req->page_list = page_list;
918 req->nr_pages = nr_pages;
919 } else {
920 dma_addr_t baddr;
921 struct rio_mport_mapping *map;
922
923 baddr = (dma_addr_t)xfer->handle;
924
925 mutex_lock(&md->buf_mutex);
926 list_for_each_entry(map, &md->mappings, node) {
927 if (baddr >= map->phys_addr &&
928 baddr < (map->phys_addr + map->size)) {
929 kref_get(&map->ref);
930 req->map = map;
931 break;
932 }
933 }
934 mutex_unlock(&md->buf_mutex);
935
936 if (req->map == NULL) {
937 ret = -ENOMEM;
938 goto err_req;
939 }
940
941 if (xfer->length + xfer->offset > map->size) {
942 ret = -EINVAL;
943 goto err_req;
944 }
945
946 ret = sg_alloc_table(&req->sgt, 1, GFP_KERNEL);
947 if (unlikely(ret)) {
948 rmcd_error("sg_alloc_table failed for internal buf");
949 goto err_req;
950 }
951
952 sg_set_buf(req->sgt.sgl,
953 map->virt_addr + (baddr - map->phys_addr) +
954 xfer->offset, xfer->length);
955 }
956
957 req->dir = dir;
958 req->filp = filp;
959 req->priv = priv;
960 chan = priv->dmach;
961
962 nents = dma_map_sg(chan->device->dev,
963 req->sgt.sgl, req->sgt.nents, dir);
964 if (nents == -EFAULT) {
965 rmcd_error("Failed to map SG list");
966 return -EFAULT;
967 }
968
969 ret = do_dma_request(req, xfer, sync, nents);
970
971 if (ret >= 0) {
972 if (sync == RIO_TRANSFER_SYNC)
973 goto sync_out;
974 return ret; /* return ASYNC cookie */
975 }
976
977 if (ret == -ETIMEDOUT || ret == -EINTR) {
978 /*
979 * This can happen only in case of SYNC transfer.
980 * Do not free unfinished request structure immediately.
981 * Place it into pending list and deal with it later
982 */
983 spin_lock(&priv->req_lock);
984 list_add_tail(&req->node, &priv->pend_list);
985 spin_unlock(&priv->req_lock);
986 return ret;
987 }
988
989
990 rmcd_debug(DMA, "do_dma_request failed with err=%d", ret);
991 sync_out:
992 dma_unmap_sg(chan->device->dev, req->sgt.sgl, req->sgt.nents, dir);
993 sg_free_table(&req->sgt);
994 err_pg:
995 if (page_list) {
996 for (i = 0; i < nr_pages; i++)
997 put_page(page_list[i]);
998 kfree(page_list);
999 }
1000 err_req:
1001 if (req->map) {
1002 mutex_lock(&md->buf_mutex);
1003 kref_put(&req->map->ref, mport_release_mapping);
1004 mutex_unlock(&md->buf_mutex);
1005 }
1006 put_dma_channel(priv);
1007 kfree(req);
1008 return ret;
1009 }
1010
1011 static int rio_mport_transfer_ioctl(struct file *filp, void __user *arg)
1012 {
1013 struct mport_cdev_priv *priv = filp->private_data;
1014 struct rio_transaction transaction;
1015 struct rio_transfer_io *transfer;
1016 enum dma_data_direction dir;
1017 int i, ret = 0;
1018
1019 if (unlikely(copy_from_user(&transaction, arg, sizeof(transaction))))
1020 return -EFAULT;
1021
1022 if (transaction.count != 1) /* only single transfer for now */
1023 return -EINVAL;
1024
1025 if ((transaction.transfer_mode &
1026 priv->md->properties.transfer_mode) == 0)
1027 return -ENODEV;
1028
1029 transfer = vmalloc(transaction.count * sizeof(*transfer));
1030 if (!transfer)
1031 return -ENOMEM;
1032
1033 if (unlikely(copy_from_user(transfer,
1034 (void __user *)(uintptr_t)transaction.block,
1035 transaction.count * sizeof(*transfer)))) {
1036 ret = -EFAULT;
1037 goto out_free;
1038 }
1039
1040 dir = (transaction.dir == RIO_TRANSFER_DIR_READ) ?
1041 DMA_FROM_DEVICE : DMA_TO_DEVICE;
1042 for (i = 0; i < transaction.count && ret == 0; i++)
1043 ret = rio_dma_transfer(filp, transaction.transfer_mode,
1044 transaction.sync, dir, &transfer[i]);
1045
1046 if (unlikely(copy_to_user((void __user *)(uintptr_t)transaction.block,
1047 transfer,
1048 transaction.count * sizeof(*transfer))))
1049 ret = -EFAULT;
1050
1051 out_free:
1052 vfree(transfer);
1053
1054 return ret;
1055 }
1056
1057 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1058 {
1059 struct mport_cdev_priv *priv;
1060 struct mport_dev *md;
1061 struct rio_async_tx_wait w_param;
1062 struct mport_dma_req *req;
1063 dma_cookie_t cookie;
1064 unsigned long tmo;
1065 long wret;
1066 int found = 0;
1067 int ret;
1068
1069 priv = (struct mport_cdev_priv *)filp->private_data;
1070 md = priv->md;
1071
1072 if (unlikely(copy_from_user(&w_param, arg, sizeof(w_param))))
1073 return -EFAULT;
1074
1075 cookie = w_param.token;
1076 if (w_param.timeout)
1077 tmo = msecs_to_jiffies(w_param.timeout);
1078 else /* Use default DMA timeout */
1079 tmo = msecs_to_jiffies(dma_timeout);
1080
1081 spin_lock(&priv->req_lock);
1082 list_for_each_entry(req, &priv->async_list, node) {
1083 if (req->cookie == cookie) {
1084 list_del(&req->node);
1085 found = 1;
1086 break;
1087 }
1088 }
1089 spin_unlock(&priv->req_lock);
1090
1091 if (!found)
1092 return -EAGAIN;
1093
1094 wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);
1095
1096 if (wret == 0) {
1097 /* Timeout on wait occurred */
1098 rmcd_error("%s(%d) timed out waiting for ASYNC DMA_%s",
1099 current->comm, task_pid_nr(current),
1100 (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
1101 ret = -ETIMEDOUT;
1102 goto err_tmo;
1103 } else if (wret == -ERESTARTSYS) {
1104 /* Wait_for_completion was interrupted by a signal but DMA may
1105 * be still in progress
1106 */
1107 rmcd_error("%s(%d) wait for ASYNC DMA_%s was interrupted",
1108 current->comm, task_pid_nr(current),
1109 (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
1110 ret = -EINTR;
1111 goto err_tmo;
1112 }
1113
1114 if (req->status != DMA_COMPLETE) {
1115 /* DMA transaction completion signaled with transfer error */
1116 rmcd_error("%s(%d) ASYNC DMA_%s completion with status %d",
1117 current->comm, task_pid_nr(current),
1118 (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE",
1119 req->status);
1120 ret = -EIO;
1121 } else
1122 ret = 0;
1123
1124 if (req->status != DMA_IN_PROGRESS && req->status != DMA_PAUSED)
1125 dma_req_free(req);
1126
1127 return ret;
1128
1129 err_tmo:
1130 /* Return request back into async queue */
1131 spin_lock(&priv->req_lock);
1132 list_add_tail(&req->node, &priv->async_list);
1133 spin_unlock(&priv->req_lock);
1134 return ret;
1135 }
1136
1137 static int rio_mport_create_dma_mapping(struct mport_dev *md, struct file *filp,
1138 u64 size, struct rio_mport_mapping **mapping)
1139 {
1140 struct rio_mport_mapping *map;
1141
1142 map = kzalloc(sizeof(*map), GFP_KERNEL);
1143 if (map == NULL)
1144 return -ENOMEM;
1145
1146 map->virt_addr = dma_alloc_coherent(md->mport->dev.parent, size,
1147 &map->phys_addr, GFP_KERNEL);
1148 if (map->virt_addr == NULL) {
1149 kfree(map);
1150 return -ENOMEM;
1151 }
1152
1153 map->dir = MAP_DMA;
1154 map->size = size;
1155 map->filp = filp;
1156 map->md = md;
1157 kref_init(&map->ref);
1158 mutex_lock(&md->buf_mutex);
1159 list_add_tail(&map->node, &md->mappings);
1160 mutex_unlock(&md->buf_mutex);
1161 *mapping = map;
1162
1163 return 0;
1164 }
1165
1166 static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1167 {
1168 struct mport_cdev_priv *priv = filp->private_data;
1169 struct mport_dev *md = priv->md;
1170 struct rio_dma_mem map;
1171 struct rio_mport_mapping *mapping = NULL;
1172 int ret;
1173
1174 if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1175 return -EFAULT;
1176
1177 ret = rio_mport_create_dma_mapping(md, filp, map.length, &mapping);
1178 if (ret)
1179 return ret;
1180
1181 map.dma_handle = mapping->phys_addr;
1182
1183 if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1184 mutex_lock(&md->buf_mutex);
1185 kref_put(&mapping->ref, mport_release_mapping);
1186 mutex_unlock(&md->buf_mutex);
1187 return -EFAULT;
1188 }
1189
1190 return 0;
1191 }
1192
1193 static int rio_mport_free_dma(struct file *filp, void __user *arg)
1194 {
1195 struct mport_cdev_priv *priv = filp->private_data;
1196 struct mport_dev *md = priv->md;
1197 u64 handle;
1198 int ret = -EFAULT;
1199 struct rio_mport_mapping *map, *_map;
1200
1201 if (copy_from_user(&handle, arg, sizeof(handle)))
1202 return -EFAULT;
1203 rmcd_debug(EXIT, "filp=%p", filp);
1204
1205 mutex_lock(&md->buf_mutex);
1206 list_for_each_entry_safe(map, _map, &md->mappings, node) {
1207 if (map->dir == MAP_DMA && map->phys_addr == handle &&
1208 map->filp == filp) {
1209 kref_put(&map->ref, mport_release_mapping);
1210 ret = 0;
1211 break;
1212 }
1213 }
1214 mutex_unlock(&md->buf_mutex);
1215
1216 if (ret == -EFAULT) {
1217 rmcd_debug(DMA, "ERR no matching mapping");
1218 return ret;
1219 }
1220
1221 return 0;
1222 }
1223 #else
1224 static int rio_mport_transfer_ioctl(struct file *filp, void *arg)
1225 {
1226 return -ENODEV;
1227 }
1228
1229 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1230 {
1231 return -ENODEV;
1232 }
1233
1234 static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1235 {
1236 return -ENODEV;
1237 }
1238
1239 static int rio_mport_free_dma(struct file *filp, void __user *arg)
1240 {
1241 return -ENODEV;
1242 }
1243 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1244
1245 /*
1246 * Inbound/outbound memory mapping functions
1247 */
1248
1249 static int
1250 rio_mport_create_inbound_mapping(struct mport_dev *md, struct file *filp,
1251 u64 raddr, u64 size,
1252 struct rio_mport_mapping **mapping)
1253 {
1254 struct rio_mport *mport = md->mport;
1255 struct rio_mport_mapping *map;
1256 int ret;
1257
1258 /* rio_map_inb_region() accepts u32 size */
1259 if (size > 0xffffffff)
1260 return -EINVAL;
1261
1262 map = kzalloc(sizeof(*map), GFP_KERNEL);
1263 if (map == NULL)
1264 return -ENOMEM;
1265
1266 map->virt_addr = dma_alloc_coherent(mport->dev.parent, size,
1267 &map->phys_addr, GFP_KERNEL);
1268 if (map->virt_addr == NULL) {
1269 ret = -ENOMEM;
1270 goto err_dma_alloc;
1271 }
1272
1273 if (raddr == RIO_MAP_ANY_ADDR)
1274 raddr = map->phys_addr;
1275 ret = rio_map_inb_region(mport, map->phys_addr, raddr, (u32)size, 0);
1276 if (ret < 0)
1277 goto err_map_inb;
1278
1279 map->dir = MAP_INBOUND;
1280 map->rio_addr = raddr;
1281 map->size = size;
1282 map->filp = filp;
1283 map->md = md;
1284 kref_init(&map->ref);
1285 mutex_lock(&md->buf_mutex);
1286 list_add_tail(&map->node, &md->mappings);
1287 mutex_unlock(&md->buf_mutex);
1288 *mapping = map;
1289 return 0;
1290
1291 err_map_inb:
1292 dma_free_coherent(mport->dev.parent, size,
1293 map->virt_addr, map->phys_addr);
1294 err_dma_alloc:
1295 kfree(map);
1296 return ret;
1297 }
1298
1299 static int
1300 rio_mport_get_inbound_mapping(struct mport_dev *md, struct file *filp,
1301 u64 raddr, u64 size,
1302 struct rio_mport_mapping **mapping)
1303 {
1304 struct rio_mport_mapping *map;
1305 int err = -ENOMEM;
1306
1307 if (raddr == RIO_MAP_ANY_ADDR)
1308 goto get_new;
1309
1310 mutex_lock(&md->buf_mutex);
1311 list_for_each_entry(map, &md->mappings, node) {
1312 if (map->dir != MAP_INBOUND)
1313 continue;
1314 if (raddr == map->rio_addr && size == map->size) {
1315 /* allow exact match only */
1316 *mapping = map;
1317 err = 0;
1318 break;
1319 } else if (raddr < (map->rio_addr + map->size - 1) &&
1320 (raddr + size) > map->rio_addr) {
1321 err = -EBUSY;
1322 break;
1323 }
1324 }
1325 mutex_unlock(&md->buf_mutex);
1326
1327 if (err != -ENOMEM)
1328 return err;
1329 get_new:
1330 /* not found, create new */
1331 return rio_mport_create_inbound_mapping(md, filp, raddr, size, mapping);
1332 }
1333
1334 static int rio_mport_map_inbound(struct file *filp, void __user *arg)
1335 {
1336 struct mport_cdev_priv *priv = filp->private_data;
1337 struct mport_dev *md = priv->md;
1338 struct rio_mmap map;
1339 struct rio_mport_mapping *mapping = NULL;
1340 int ret;
1341
1342 if (!md->mport->ops->map_inb)
1343 return -EPROTONOSUPPORT;
1344 if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1345 return -EFAULT;
1346
1347 rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1348
1349 ret = rio_mport_get_inbound_mapping(md, filp, map.rio_addr,
1350 map.length, &mapping);
1351 if (ret)
1352 return ret;
1353
1354 map.handle = mapping->phys_addr;
1355 map.rio_addr = mapping->rio_addr;
1356
1357 if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1358 /* Delete mapping if it was created by this request */
1359 if (ret == 0 && mapping->filp == filp) {
1360 mutex_lock(&md->buf_mutex);
1361 kref_put(&mapping->ref, mport_release_mapping);
1362 mutex_unlock(&md->buf_mutex);
1363 }
1364 return -EFAULT;
1365 }
1366
1367 return 0;
1368 }
1369
1370 /*
1371 * rio_mport_inbound_free() - unmap from RapidIO address space and free
1372 * previously allocated inbound DMA coherent buffer
1373 * @priv: driver private data
1374 * @arg: buffer handle returned by allocation routine
1375 */
1376 static int rio_mport_inbound_free(struct file *filp, void __user *arg)
1377 {
1378 struct mport_cdev_priv *priv = filp->private_data;
1379 struct mport_dev *md = priv->md;
1380 u64 handle;
1381 struct rio_mport_mapping *map, *_map;
1382
1383 rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1384
1385 if (!md->mport->ops->unmap_inb)
1386 return -EPROTONOSUPPORT;
1387
1388 if (copy_from_user(&handle, arg, sizeof(handle)))
1389 return -EFAULT;
1390
1391 mutex_lock(&md->buf_mutex);
1392 list_for_each_entry_safe(map, _map, &md->mappings, node) {
1393 if (map->dir == MAP_INBOUND && map->phys_addr == handle) {
1394 if (map->filp == filp) {
1395 map->filp = NULL;
1396 kref_put(&map->ref, mport_release_mapping);
1397 }
1398 break;
1399 }
1400 }
1401 mutex_unlock(&md->buf_mutex);
1402
1403 return 0;
1404 }
1405
1406 /*
1407 * maint_port_idx_get() - Get the port index of the mport instance
1408 * @priv: driver private data
1409 * @arg: port index
1410 */
1411 static int maint_port_idx_get(struct mport_cdev_priv *priv, void __user *arg)
1412 {
1413 struct mport_dev *md = priv->md;
1414 u32 port_idx = md->mport->index;
1415
1416 rmcd_debug(MPORT, "port_index=%d", port_idx);
1417
1418 if (copy_to_user(arg, &port_idx, sizeof(port_idx)))
1419 return -EFAULT;
1420
1421 return 0;
1422 }
1423
1424 static int rio_mport_add_event(struct mport_cdev_priv *priv,
1425 struct rio_event *event)
1426 {
1427 int overflow;
1428
1429 if (!(priv->event_mask & event->header))
1430 return -EACCES;
1431
1432 spin_lock(&priv->fifo_lock);
1433 overflow = kfifo_avail(&priv->event_fifo) < sizeof(*event)
1434 || kfifo_in(&priv->event_fifo, (unsigned char *)event,
1435 sizeof(*event)) != sizeof(*event);
1436 spin_unlock(&priv->fifo_lock);
1437
1438 wake_up_interruptible(&priv->event_rx_wait);
1439
1440 if (overflow) {
1441 dev_warn(&priv->md->dev, DRV_NAME ": event fifo overflow\n");
1442 return -EBUSY;
1443 }
1444
1445 return 0;
1446 }
1447
1448 static void rio_mport_doorbell_handler(struct rio_mport *mport, void *dev_id,
1449 u16 src, u16 dst, u16 info)
1450 {
1451 struct mport_dev *data = dev_id;
1452 struct mport_cdev_priv *priv;
1453 struct rio_mport_db_filter *db_filter;
1454 struct rio_event event;
1455 int handled;
1456
1457 event.header = RIO_DOORBELL;
1458 event.u.doorbell.rioid = src;
1459 event.u.doorbell.payload = info;
1460
1461 handled = 0;
1462 spin_lock(&data->db_lock);
1463 list_for_each_entry(db_filter, &data->doorbells, data_node) {
1464 if (((db_filter->filter.rioid == RIO_INVALID_DESTID ||
1465 db_filter->filter.rioid == src)) &&
1466 info >= db_filter->filter.low &&
1467 info <= db_filter->filter.high) {
1468 priv = db_filter->priv;
1469 rio_mport_add_event(priv, &event);
1470 handled = 1;
1471 }
1472 }
1473 spin_unlock(&data->db_lock);
1474
1475 if (!handled)
1476 dev_warn(&data->dev,
1477 "%s: spurious DB received from 0x%x, info=0x%04x\n",
1478 __func__, src, info);
1479 }
1480
1481 static int rio_mport_add_db_filter(struct mport_cdev_priv *priv,
1482 void __user *arg)
1483 {
1484 struct mport_dev *md = priv->md;
1485 struct rio_mport_db_filter *db_filter;
1486 struct rio_doorbell_filter filter;
1487 unsigned long flags;
1488 int ret;
1489
1490 if (copy_from_user(&filter, arg, sizeof(filter)))
1491 return -EFAULT;
1492
1493 if (filter.low > filter.high)
1494 return -EINVAL;
1495
1496 ret = rio_request_inb_dbell(md->mport, md, filter.low, filter.high,
1497 rio_mport_doorbell_handler);
1498 if (ret) {
1499 rmcd_error("%s failed to register IBDB, err=%d",
1500 dev_name(&md->dev), ret);
1501 return ret;
1502 }
1503
1504 db_filter = kzalloc(sizeof(*db_filter), GFP_KERNEL);
1505 if (db_filter == NULL) {
1506 rio_release_inb_dbell(md->mport, filter.low, filter.high);
1507 return -ENOMEM;
1508 }
1509
1510 db_filter->filter = filter;
1511 db_filter->priv = priv;
1512 spin_lock_irqsave(&md->db_lock, flags);
1513 list_add_tail(&db_filter->priv_node, &priv->db_filters);
1514 list_add_tail(&db_filter->data_node, &md->doorbells);
1515 spin_unlock_irqrestore(&md->db_lock, flags);
1516
1517 return 0;
1518 }
1519
1520 static void rio_mport_delete_db_filter(struct rio_mport_db_filter *db_filter)
1521 {
1522 list_del(&db_filter->data_node);
1523 list_del(&db_filter->priv_node);
1524 kfree(db_filter);
1525 }
1526
1527 static int rio_mport_remove_db_filter(struct mport_cdev_priv *priv,
1528 void __user *arg)
1529 {
1530 struct rio_mport_db_filter *db_filter;
1531 struct rio_doorbell_filter filter;
1532 unsigned long flags;
1533 int ret = -EINVAL;
1534
1535 if (copy_from_user(&filter, arg, sizeof(filter)))
1536 return -EFAULT;
1537
1538 if (filter.low > filter.high)
1539 return -EINVAL;
1540
1541 spin_lock_irqsave(&priv->md->db_lock, flags);
1542 list_for_each_entry(db_filter, &priv->db_filters, priv_node) {
1543 if (db_filter->filter.rioid == filter.rioid &&
1544 db_filter->filter.low == filter.low &&
1545 db_filter->filter.high == filter.high) {
1546 rio_mport_delete_db_filter(db_filter);
1547 ret = 0;
1548 break;
1549 }
1550 }
1551 spin_unlock_irqrestore(&priv->md->db_lock, flags);
1552
1553 if (!ret)
1554 rio_release_inb_dbell(priv->md->mport, filter.low, filter.high);
1555
1556 return ret;
1557 }
1558
1559 static int rio_mport_match_pw(union rio_pw_msg *msg,
1560 struct rio_pw_filter *filter)
1561 {
1562 if ((msg->em.comptag & filter->mask) < filter->low ||
1563 (msg->em.comptag & filter->mask) > filter->high)
1564 return 0;
1565 return 1;
1566 }
1567
1568 static int rio_mport_pw_handler(struct rio_mport *mport, void *context,
1569 union rio_pw_msg *msg, int step)
1570 {
1571 struct mport_dev *md = context;
1572 struct mport_cdev_priv *priv;
1573 struct rio_mport_pw_filter *pw_filter;
1574 struct rio_event event;
1575 int handled;
1576
1577 event.header = RIO_PORTWRITE;
1578 memcpy(event.u.portwrite.payload, msg->raw, RIO_PW_MSG_SIZE);
1579
1580 handled = 0;
1581 spin_lock(&md->pw_lock);
1582 list_for_each_entry(pw_filter, &md->portwrites, md_node) {
1583 if (rio_mport_match_pw(msg, &pw_filter->filter)) {
1584 priv = pw_filter->priv;
1585 rio_mport_add_event(priv, &event);
1586 handled = 1;
1587 }
1588 }
1589 spin_unlock(&md->pw_lock);
1590
1591 if (!handled) {
1592 printk_ratelimited(KERN_WARNING DRV_NAME
1593 ": mport%d received spurious PW from 0x%08x\n",
1594 mport->id, msg->em.comptag);
1595 }
1596
1597 return 0;
1598 }
1599
1600 static int rio_mport_add_pw_filter(struct mport_cdev_priv *priv,
1601 void __user *arg)
1602 {
1603 struct mport_dev *md = priv->md;
1604 struct rio_mport_pw_filter *pw_filter;
1605 struct rio_pw_filter filter;
1606 unsigned long flags;
1607 int hadd = 0;
1608
1609 if (copy_from_user(&filter, arg, sizeof(filter)))
1610 return -EFAULT;
1611
1612 pw_filter = kzalloc(sizeof(*pw_filter), GFP_KERNEL);
1613 if (pw_filter == NULL)
1614 return -ENOMEM;
1615
1616 pw_filter->filter = filter;
1617 pw_filter->priv = priv;
1618 spin_lock_irqsave(&md->pw_lock, flags);
1619 if (list_empty(&md->portwrites))
1620 hadd = 1;
1621 list_add_tail(&pw_filter->priv_node, &priv->pw_filters);
1622 list_add_tail(&pw_filter->md_node, &md->portwrites);
1623 spin_unlock_irqrestore(&md->pw_lock, flags);
1624
1625 if (hadd) {
1626 int ret;
1627
1628 ret = rio_add_mport_pw_handler(md->mport, md,
1629 rio_mport_pw_handler);
1630 if (ret) {
1631 dev_err(&md->dev,
1632 "%s: failed to add IB_PW handler, err=%d\n",
1633 __func__, ret);
1634 return ret;
1635 }
1636 rio_pw_enable(md->mport, 1);
1637 }
1638
1639 return 0;
1640 }
1641
1642 static void rio_mport_delete_pw_filter(struct rio_mport_pw_filter *pw_filter)
1643 {
1644 list_del(&pw_filter->md_node);
1645 list_del(&pw_filter->priv_node);
1646 kfree(pw_filter);
1647 }
1648
1649 static int rio_mport_match_pw_filter(struct rio_pw_filter *a,
1650 struct rio_pw_filter *b)
1651 {
1652 if ((a->mask == b->mask) && (a->low == b->low) && (a->high == b->high))
1653 return 1;
1654 return 0;
1655 }
1656
1657 static int rio_mport_remove_pw_filter(struct mport_cdev_priv *priv,
1658 void __user *arg)
1659 {
1660 struct mport_dev *md = priv->md;
1661 struct rio_mport_pw_filter *pw_filter;
1662 struct rio_pw_filter filter;
1663 unsigned long flags;
1664 int ret = -EINVAL;
1665 int hdel = 0;
1666
1667 if (copy_from_user(&filter, arg, sizeof(filter)))
1668 return -EFAULT;
1669
1670 spin_lock_irqsave(&md->pw_lock, flags);
1671 list_for_each_entry(pw_filter, &priv->pw_filters, priv_node) {
1672 if (rio_mport_match_pw_filter(&pw_filter->filter, &filter)) {
1673 rio_mport_delete_pw_filter(pw_filter);
1674 ret = 0;
1675 break;
1676 }
1677 }
1678
1679 if (list_empty(&md->portwrites))
1680 hdel = 1;
1681 spin_unlock_irqrestore(&md->pw_lock, flags);
1682
1683 if (hdel) {
1684 rio_del_mport_pw_handler(md->mport, priv->md,
1685 rio_mport_pw_handler);
1686 rio_pw_enable(md->mport, 0);
1687 }
1688
1689 return ret;
1690 }
1691
1692 /*
1693 * rio_release_dev - release routine for kernel RIO device object
1694 * @dev: kernel device object associated with a RIO device structure
1695 *
1696 * Frees a RIO device struct associated a RIO device struct.
1697 * The RIO device struct is freed.
1698 */
1699 static void rio_release_dev(struct device *dev)
1700 {
1701 struct rio_dev *rdev;
1702
1703 rdev = to_rio_dev(dev);
1704 pr_info(DRV_PREFIX "%s: %s\n", __func__, rio_name(rdev));
1705 kfree(rdev);
1706 }
1707
1708
1709 static void rio_release_net(struct device *dev)
1710 {
1711 struct rio_net *net;
1712
1713 net = to_rio_net(dev);
1714 rmcd_debug(RDEV, "net_%d", net->id);
1715 kfree(net);
1716 }
1717
1718
1719 /*
1720 * rio_mport_add_riodev - creates a kernel RIO device object
1721 *
1722 * Allocates a RIO device data structure and initializes required fields based
1723 * on device's configuration space contents.
1724 * If the device has switch capabilities, then a switch specific portion is
1725 * allocated and configured.
1726 */
1727 static int rio_mport_add_riodev(struct mport_cdev_priv *priv,
1728 void __user *arg)
1729 {
1730 struct mport_dev *md = priv->md;
1731 struct rio_rdev_info dev_info;
1732 struct rio_dev *rdev;
1733 struct rio_switch *rswitch = NULL;
1734 struct rio_mport *mport;
1735 size_t size;
1736 u32 rval;
1737 u32 swpinfo = 0;
1738 u16 destid;
1739 u8 hopcount;
1740 int err;
1741
1742 if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1743 return -EFAULT;
1744
1745 rmcd_debug(RDEV, "name:%s ct:0x%x did:0x%x hc:0x%x", dev_info.name,
1746 dev_info.comptag, dev_info.destid, dev_info.hopcount);
1747
1748 if (bus_find_device_by_name(&rio_bus_type, NULL, dev_info.name)) {
1749 rmcd_debug(RDEV, "device %s already exists", dev_info.name);
1750 return -EEXIST;
1751 }
1752
1753 size = sizeof(*rdev);
1754 mport = md->mport;
1755 destid = dev_info.destid;
1756 hopcount = dev_info.hopcount;
1757
1758 if (rio_mport_read_config_32(mport, destid, hopcount,
1759 RIO_PEF_CAR, &rval))
1760 return -EIO;
1761
1762 if (rval & RIO_PEF_SWITCH) {
1763 rio_mport_read_config_32(mport, destid, hopcount,
1764 RIO_SWP_INFO_CAR, &swpinfo);
1765 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
1766 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
1767 }
1768
1769 rdev = kzalloc(size, GFP_KERNEL);
1770 if (rdev == NULL)
1771 return -ENOMEM;
1772
1773 if (mport->net == NULL) {
1774 struct rio_net *net;
1775
1776 net = rio_alloc_net(mport);
1777 if (!net) {
1778 err = -ENOMEM;
1779 rmcd_debug(RDEV, "failed to allocate net object");
1780 goto cleanup;
1781 }
1782
1783 net->id = mport->id;
1784 net->hport = mport;
1785 dev_set_name(&net->dev, "rnet_%d", net->id);
1786 net->dev.parent = &mport->dev;
1787 net->dev.release = rio_release_net;
1788 err = rio_add_net(net);
1789 if (err) {
1790 rmcd_debug(RDEV, "failed to register net, err=%d", err);
1791 kfree(net);
1792 goto cleanup;
1793 }
1794 }
1795
1796 rdev->net = mport->net;
1797 rdev->pef = rval;
1798 rdev->swpinfo = swpinfo;
1799 rio_mport_read_config_32(mport, destid, hopcount,
1800 RIO_DEV_ID_CAR, &rval);
1801 rdev->did = rval >> 16;
1802 rdev->vid = rval & 0xffff;
1803 rio_mport_read_config_32(mport, destid, hopcount, RIO_DEV_INFO_CAR,
1804 &rdev->device_rev);
1805 rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_ID_CAR,
1806 &rval);
1807 rdev->asm_did = rval >> 16;
1808 rdev->asm_vid = rval & 0xffff;
1809 rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_INFO_CAR,
1810 &rval);
1811 rdev->asm_rev = rval >> 16;
1812
1813 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
1814 rdev->efptr = rval & 0xffff;
1815 rdev->phys_efptr = rio_mport_get_physefb(mport, 0, destid,
1816 hopcount, &rdev->phys_rmap);
1817
1818 rdev->em_efptr = rio_mport_get_feature(mport, 0, destid,
1819 hopcount, RIO_EFB_ERR_MGMNT);
1820 }
1821
1822 rio_mport_read_config_32(mport, destid, hopcount, RIO_SRC_OPS_CAR,
1823 &rdev->src_ops);
1824 rio_mport_read_config_32(mport, destid, hopcount, RIO_DST_OPS_CAR,
1825 &rdev->dst_ops);
1826
1827 rdev->comp_tag = dev_info.comptag;
1828 rdev->destid = destid;
1829 /* hopcount is stored as specified by a caller, regardles of EP or SW */
1830 rdev->hopcount = hopcount;
1831
1832 if (rdev->pef & RIO_PEF_SWITCH) {
1833 rswitch = rdev->rswitch;
1834 rswitch->route_table = NULL;
1835 }
1836
1837 if (strlen(dev_info.name))
1838 dev_set_name(&rdev->dev, "%s", dev_info.name);
1839 else if (rdev->pef & RIO_PEF_SWITCH)
1840 dev_set_name(&rdev->dev, "%02x:s:%04x", mport->id,
1841 rdev->comp_tag & RIO_CTAG_UDEVID);
1842 else
1843 dev_set_name(&rdev->dev, "%02x:e:%04x", mport->id,
1844 rdev->comp_tag & RIO_CTAG_UDEVID);
1845
1846 INIT_LIST_HEAD(&rdev->net_list);
1847 rdev->dev.parent = &mport->net->dev;
1848 rio_attach_device(rdev);
1849 rdev->dev.release = rio_release_dev;
1850
1851 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
1852 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
1853 0, 0xffff);
1854 err = rio_add_device(rdev);
1855 if (err)
1856 goto cleanup;
1857 rio_dev_get(rdev);
1858
1859 return 0;
1860 cleanup:
1861 kfree(rdev);
1862 return err;
1863 }
1864
1865 static int rio_mport_del_riodev(struct mport_cdev_priv *priv, void __user *arg)
1866 {
1867 struct rio_rdev_info dev_info;
1868 struct rio_dev *rdev = NULL;
1869 struct device *dev;
1870 struct rio_mport *mport;
1871 struct rio_net *net;
1872
1873 if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1874 return -EFAULT;
1875
1876 mport = priv->md->mport;
1877
1878 /* If device name is specified, removal by name has priority */
1879 if (strlen(dev_info.name)) {
1880 dev = bus_find_device_by_name(&rio_bus_type, NULL,
1881 dev_info.name);
1882 if (dev)
1883 rdev = to_rio_dev(dev);
1884 } else {
1885 do {
1886 rdev = rio_get_comptag(dev_info.comptag, rdev);
1887 if (rdev && rdev->dev.parent == &mport->net->dev &&
1888 rdev->destid == dev_info.destid &&
1889 rdev->hopcount == dev_info.hopcount)
1890 break;
1891 } while (rdev);
1892 }
1893
1894 if (!rdev) {
1895 rmcd_debug(RDEV,
1896 "device name:%s ct:0x%x did:0x%x hc:0x%x not found",
1897 dev_info.name, dev_info.comptag, dev_info.destid,
1898 dev_info.hopcount);
1899 return -ENODEV;
1900 }
1901
1902 net = rdev->net;
1903 rio_dev_put(rdev);
1904 rio_del_device(rdev, RIO_DEVICE_SHUTDOWN);
1905
1906 if (list_empty(&net->devices)) {
1907 rio_free_net(net);
1908 mport->net = NULL;
1909 }
1910
1911 return 0;
1912 }
1913
1914 /*
1915 * Mport cdev management
1916 */
1917
1918 /*
1919 * mport_cdev_open() - Open character device (mport)
1920 */
1921 static int mport_cdev_open(struct inode *inode, struct file *filp)
1922 {
1923 int ret;
1924 int minor = iminor(inode);
1925 struct mport_dev *chdev;
1926 struct mport_cdev_priv *priv;
1927
1928 /* Test for valid device */
1929 if (minor >= RIO_MAX_MPORTS) {
1930 rmcd_error("Invalid minor device number");
1931 return -EINVAL;
1932 }
1933
1934 chdev = container_of(inode->i_cdev, struct mport_dev, cdev);
1935
1936 rmcd_debug(INIT, "%s filp=%p", dev_name(&chdev->dev), filp);
1937
1938 if (atomic_read(&chdev->active) == 0)
1939 return -ENODEV;
1940
1941 get_device(&chdev->dev);
1942
1943 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1944 if (!priv) {
1945 put_device(&chdev->dev);
1946 return -ENOMEM;
1947 }
1948
1949 priv->md = chdev;
1950
1951 mutex_lock(&chdev->file_mutex);
1952 list_add_tail(&priv->list, &chdev->file_list);
1953 mutex_unlock(&chdev->file_mutex);
1954
1955 INIT_LIST_HEAD(&priv->db_filters);
1956 INIT_LIST_HEAD(&priv->pw_filters);
1957 spin_lock_init(&priv->fifo_lock);
1958 init_waitqueue_head(&priv->event_rx_wait);
1959 ret = kfifo_alloc(&priv->event_fifo,
1960 sizeof(struct rio_event) * MPORT_EVENT_DEPTH,
1961 GFP_KERNEL);
1962 if (ret < 0) {
1963 dev_err(&chdev->dev, DRV_NAME ": kfifo_alloc failed\n");
1964 ret = -ENOMEM;
1965 goto err_fifo;
1966 }
1967
1968 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1969 INIT_LIST_HEAD(&priv->async_list);
1970 INIT_LIST_HEAD(&priv->pend_list);
1971 spin_lock_init(&priv->req_lock);
1972 mutex_init(&priv->dma_lock);
1973 #endif
1974
1975 filp->private_data = priv;
1976 goto out;
1977 err_fifo:
1978 kfree(priv);
1979 out:
1980 return ret;
1981 }
1982
1983 static int mport_cdev_fasync(int fd, struct file *filp, int mode)
1984 {
1985 struct mport_cdev_priv *priv = filp->private_data;
1986
1987 return fasync_helper(fd, filp, mode, &priv->async_queue);
1988 }
1989
1990 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1991 static void mport_cdev_release_dma(struct file *filp)
1992 {
1993 struct mport_cdev_priv *priv = filp->private_data;
1994 struct mport_dev *md;
1995 struct mport_dma_req *req, *req_next;
1996 unsigned long tmo = msecs_to_jiffies(dma_timeout);
1997 long wret;
1998 LIST_HEAD(list);
1999
2000 rmcd_debug(EXIT, "from filp=%p %s(%d)",
2001 filp, current->comm, task_pid_nr(current));
2002
2003 if (!priv->dmach) {
2004 rmcd_debug(EXIT, "No DMA channel for filp=%p", filp);
2005 return;
2006 }
2007
2008 md = priv->md;
2009
2010 flush_workqueue(dma_wq);
2011
2012 spin_lock(&priv->req_lock);
2013 if (!list_empty(&priv->async_list)) {
2014 rmcd_debug(EXIT, "async list not empty filp=%p %s(%d)",
2015 filp, current->comm, task_pid_nr(current));
2016 list_splice_init(&priv->async_list, &list);
2017 }
2018 spin_unlock(&priv->req_lock);
2019
2020 if (!list_empty(&list)) {
2021 rmcd_debug(EXIT, "temp list not empty");
2022 list_for_each_entry_safe(req, req_next, &list, node) {
2023 rmcd_debug(EXIT, "free req->filp=%p cookie=%d compl=%s",
2024 req->filp, req->cookie,
2025 completion_done(&req->req_comp)?"yes":"no");
2026 list_del(&req->node);
2027 dma_req_free(req);
2028 }
2029 }
2030
2031 if (!list_empty(&priv->pend_list)) {
2032 rmcd_debug(EXIT, "Free pending DMA requests for filp=%p %s(%d)",
2033 filp, current->comm, task_pid_nr(current));
2034 list_for_each_entry_safe(req,
2035 req_next, &priv->pend_list, node) {
2036 rmcd_debug(EXIT, "free req->filp=%p cookie=%d compl=%s",
2037 req->filp, req->cookie,
2038 completion_done(&req->req_comp)?"yes":"no");
2039 list_del(&req->node);
2040 dma_req_free(req);
2041 }
2042 }
2043
2044 put_dma_channel(priv);
2045 wret = wait_for_completion_interruptible_timeout(&priv->comp, tmo);
2046
2047 if (wret <= 0) {
2048 rmcd_error("%s(%d) failed waiting for DMA release err=%ld",
2049 current->comm, task_pid_nr(current), wret);
2050 }
2051
2052 spin_lock(&priv->req_lock);
2053
2054 if (!list_empty(&priv->pend_list)) {
2055 rmcd_debug(EXIT, "ATTN: pending DMA requests, filp=%p %s(%d)",
2056 filp, current->comm, task_pid_nr(current));
2057 }
2058
2059 spin_unlock(&priv->req_lock);
2060
2061 if (priv->dmach != priv->md->dma_chan) {
2062 rmcd_debug(EXIT, "Release DMA channel for filp=%p %s(%d)",
2063 filp, current->comm, task_pid_nr(current));
2064 rio_release_dma(priv->dmach);
2065 } else {
2066 rmcd_debug(EXIT, "Adjust default DMA channel refcount");
2067 kref_put(&md->dma_ref, mport_release_def_dma);
2068 }
2069
2070 priv->dmach = NULL;
2071 }
2072 #else
2073 #define mport_cdev_release_dma(priv) do {} while (0)
2074 #endif
2075
2076 /*
2077 * mport_cdev_release() - Release character device
2078 */
2079 static int mport_cdev_release(struct inode *inode, struct file *filp)
2080 {
2081 struct mport_cdev_priv *priv = filp->private_data;
2082 struct mport_dev *chdev;
2083 struct rio_mport_pw_filter *pw_filter, *pw_filter_next;
2084 struct rio_mport_db_filter *db_filter, *db_filter_next;
2085 struct rio_mport_mapping *map, *_map;
2086 unsigned long flags;
2087
2088 rmcd_debug(EXIT, "%s filp=%p", dev_name(&priv->md->dev), filp);
2089
2090 chdev = priv->md;
2091 mport_cdev_release_dma(filp);
2092
2093 priv->event_mask = 0;
2094
2095 spin_lock_irqsave(&chdev->pw_lock, flags);
2096 if (!list_empty(&priv->pw_filters)) {
2097 list_for_each_entry_safe(pw_filter, pw_filter_next,
2098 &priv->pw_filters, priv_node)
2099 rio_mport_delete_pw_filter(pw_filter);
2100 }
2101 spin_unlock_irqrestore(&chdev->pw_lock, flags);
2102
2103 spin_lock_irqsave(&chdev->db_lock, flags);
2104 list_for_each_entry_safe(db_filter, db_filter_next,
2105 &priv->db_filters, priv_node) {
2106 rio_mport_delete_db_filter(db_filter);
2107 }
2108 spin_unlock_irqrestore(&chdev->db_lock, flags);
2109
2110 kfifo_free(&priv->event_fifo);
2111
2112 mutex_lock(&chdev->buf_mutex);
2113 list_for_each_entry_safe(map, _map, &chdev->mappings, node) {
2114 if (map->filp == filp) {
2115 rmcd_debug(EXIT, "release mapping %p filp=%p",
2116 map->virt_addr, filp);
2117 kref_put(&map->ref, mport_release_mapping);
2118 }
2119 }
2120 mutex_unlock(&chdev->buf_mutex);
2121
2122 mport_cdev_fasync(-1, filp, 0);
2123 filp->private_data = NULL;
2124 mutex_lock(&chdev->file_mutex);
2125 list_del(&priv->list);
2126 mutex_unlock(&chdev->file_mutex);
2127 put_device(&chdev->dev);
2128 kfree(priv);
2129 return 0;
2130 }
2131
2132 /*
2133 * mport_cdev_ioctl() - IOCTLs for character device
2134 */
2135 static long mport_cdev_ioctl(struct file *filp,
2136 unsigned int cmd, unsigned long arg)
2137 {
2138 int err = -EINVAL;
2139 struct mport_cdev_priv *data = filp->private_data;
2140 struct mport_dev *md = data->md;
2141
2142 if (atomic_read(&md->active) == 0)
2143 return -ENODEV;
2144
2145 switch (cmd) {
2146 case RIO_MPORT_MAINT_READ_LOCAL:
2147 return rio_mport_maint_rd(data, (void __user *)arg, 1);
2148 case RIO_MPORT_MAINT_WRITE_LOCAL:
2149 return rio_mport_maint_wr(data, (void __user *)arg, 1);
2150 case RIO_MPORT_MAINT_READ_REMOTE:
2151 return rio_mport_maint_rd(data, (void __user *)arg, 0);
2152 case RIO_MPORT_MAINT_WRITE_REMOTE:
2153 return rio_mport_maint_wr(data, (void __user *)arg, 0);
2154 case RIO_MPORT_MAINT_HDID_SET:
2155 return maint_hdid_set(data, (void __user *)arg);
2156 case RIO_MPORT_MAINT_COMPTAG_SET:
2157 return maint_comptag_set(data, (void __user *)arg);
2158 case RIO_MPORT_MAINT_PORT_IDX_GET:
2159 return maint_port_idx_get(data, (void __user *)arg);
2160 case RIO_MPORT_GET_PROPERTIES:
2161 md->properties.hdid = md->mport->host_deviceid;
2162 if (copy_to_user((void __user *)arg, &(md->properties),
2163 sizeof(md->properties)))
2164 return -EFAULT;
2165 return 0;
2166 case RIO_ENABLE_DOORBELL_RANGE:
2167 return rio_mport_add_db_filter(data, (void __user *)arg);
2168 case RIO_DISABLE_DOORBELL_RANGE:
2169 return rio_mport_remove_db_filter(data, (void __user *)arg);
2170 case RIO_ENABLE_PORTWRITE_RANGE:
2171 return rio_mport_add_pw_filter(data, (void __user *)arg);
2172 case RIO_DISABLE_PORTWRITE_RANGE:
2173 return rio_mport_remove_pw_filter(data, (void __user *)arg);
2174 case RIO_SET_EVENT_MASK:
2175 data->event_mask = (u32)arg;
2176 return 0;
2177 case RIO_GET_EVENT_MASK:
2178 if (copy_to_user((void __user *)arg, &data->event_mask,
2179 sizeof(u32)))
2180 return -EFAULT;
2181 return 0;
2182 case RIO_MAP_OUTBOUND:
2183 return rio_mport_obw_map(filp, (void __user *)arg);
2184 case RIO_MAP_INBOUND:
2185 return rio_mport_map_inbound(filp, (void __user *)arg);
2186 case RIO_UNMAP_OUTBOUND:
2187 return rio_mport_obw_free(filp, (void __user *)arg);
2188 case RIO_UNMAP_INBOUND:
2189 return rio_mport_inbound_free(filp, (void __user *)arg);
2190 case RIO_ALLOC_DMA:
2191 return rio_mport_alloc_dma(filp, (void __user *)arg);
2192 case RIO_FREE_DMA:
2193 return rio_mport_free_dma(filp, (void __user *)arg);
2194 case RIO_WAIT_FOR_ASYNC:
2195 return rio_mport_wait_for_async_dma(filp, (void __user *)arg);
2196 case RIO_TRANSFER:
2197 return rio_mport_transfer_ioctl(filp, (void __user *)arg);
2198 case RIO_DEV_ADD:
2199 return rio_mport_add_riodev(data, (void __user *)arg);
2200 case RIO_DEV_DEL:
2201 return rio_mport_del_riodev(data, (void __user *)arg);
2202 default:
2203 break;
2204 }
2205
2206 return err;
2207 }
2208
2209 /*
2210 * mport_release_mapping - free mapping resources and info structure
2211 * @ref: a pointer to the kref within struct rio_mport_mapping
2212 *
2213 * NOTE: Shall be called while holding buf_mutex.
2214 */
2215 static void mport_release_mapping(struct kref *ref)
2216 {
2217 struct rio_mport_mapping *map =
2218 container_of(ref, struct rio_mport_mapping, ref);
2219 struct rio_mport *mport = map->md->mport;
2220
2221 rmcd_debug(MMAP, "type %d mapping @ %p (phys = %pad) for %s",
2222 map->dir, map->virt_addr,
2223 &map->phys_addr, mport->name);
2224
2225 list_del(&map->node);
2226
2227 switch (map->dir) {
2228 case MAP_INBOUND:
2229 rio_unmap_inb_region(mport, map->phys_addr);
2230 case MAP_DMA:
2231 dma_free_coherent(mport->dev.parent, map->size,
2232 map->virt_addr, map->phys_addr);
2233 break;
2234 case MAP_OUTBOUND:
2235 rio_unmap_outb_region(mport, map->rioid, map->rio_addr);
2236 break;
2237 }
2238 kfree(map);
2239 }
2240
2241 static void mport_mm_open(struct vm_area_struct *vma)
2242 {
2243 struct rio_mport_mapping *map = vma->vm_private_data;
2244
2245 rmcd_debug(MMAP, "%pad", &map->phys_addr);
2246 kref_get(&map->ref);
2247 }
2248
2249 static void mport_mm_close(struct vm_area_struct *vma)
2250 {
2251 struct rio_mport_mapping *map = vma->vm_private_data;
2252
2253 rmcd_debug(MMAP, "%pad", &map->phys_addr);
2254 mutex_lock(&map->md->buf_mutex);
2255 kref_put(&map->ref, mport_release_mapping);
2256 mutex_unlock(&map->md->buf_mutex);
2257 }
2258
2259 static const struct vm_operations_struct vm_ops = {
2260 .open = mport_mm_open,
2261 .close = mport_mm_close,
2262 };
2263
2264 static int mport_cdev_mmap(struct file *filp, struct vm_area_struct *vma)
2265 {
2266 struct mport_cdev_priv *priv = filp->private_data;
2267 struct mport_dev *md;
2268 size_t size = vma->vm_end - vma->vm_start;
2269 dma_addr_t baddr;
2270 unsigned long offset;
2271 int found = 0, ret;
2272 struct rio_mport_mapping *map;
2273
2274 rmcd_debug(MMAP, "0x%x bytes at offset 0x%lx",
2275 (unsigned int)size, vma->vm_pgoff);
2276
2277 md = priv->md;
2278 baddr = ((dma_addr_t)vma->vm_pgoff << PAGE_SHIFT);
2279
2280 mutex_lock(&md->buf_mutex);
2281 list_for_each_entry(map, &md->mappings, node) {
2282 if (baddr >= map->phys_addr &&
2283 baddr < (map->phys_addr + map->size)) {
2284 found = 1;
2285 break;
2286 }
2287 }
2288 mutex_unlock(&md->buf_mutex);
2289
2290 if (!found)
2291 return -ENOMEM;
2292
2293 offset = baddr - map->phys_addr;
2294
2295 if (size + offset > map->size)
2296 return -EINVAL;
2297
2298 vma->vm_pgoff = offset >> PAGE_SHIFT;
2299 rmcd_debug(MMAP, "MMAP adjusted offset = 0x%lx", vma->vm_pgoff);
2300
2301 if (map->dir == MAP_INBOUND || map->dir == MAP_DMA)
2302 ret = dma_mmap_coherent(md->mport->dev.parent, vma,
2303 map->virt_addr, map->phys_addr, map->size);
2304 else if (map->dir == MAP_OUTBOUND) {
2305 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
2306 ret = vm_iomap_memory(vma, map->phys_addr, map->size);
2307 } else {
2308 rmcd_error("Attempt to mmap unsupported mapping type");
2309 ret = -EIO;
2310 }
2311
2312 if (!ret) {
2313 vma->vm_private_data = map;
2314 vma->vm_ops = &vm_ops;
2315 mport_mm_open(vma);
2316 } else {
2317 rmcd_error("MMAP exit with err=%d", ret);
2318 }
2319
2320 return ret;
2321 }
2322
2323 static unsigned int mport_cdev_poll(struct file *filp, poll_table *wait)
2324 {
2325 struct mport_cdev_priv *priv = filp->private_data;
2326
2327 poll_wait(filp, &priv->event_rx_wait, wait);
2328 if (kfifo_len(&priv->event_fifo))
2329 return POLLIN | POLLRDNORM;
2330
2331 return 0;
2332 }
2333
2334 static ssize_t mport_read(struct file *filp, char __user *buf, size_t count,
2335 loff_t *ppos)
2336 {
2337 struct mport_cdev_priv *priv = filp->private_data;
2338 int copied;
2339 ssize_t ret;
2340
2341 if (!count)
2342 return 0;
2343
2344 if (kfifo_is_empty(&priv->event_fifo) &&
2345 (filp->f_flags & O_NONBLOCK))
2346 return -EAGAIN;
2347
2348 if (count % sizeof(struct rio_event))
2349 return -EINVAL;
2350
2351 ret = wait_event_interruptible(priv->event_rx_wait,
2352 kfifo_len(&priv->event_fifo) != 0);
2353 if (ret)
2354 return ret;
2355
2356 while (ret < count) {
2357 if (kfifo_to_user(&priv->event_fifo, buf,
2358 sizeof(struct rio_event), &copied))
2359 return -EFAULT;
2360 ret += copied;
2361 buf += copied;
2362 }
2363
2364 return ret;
2365 }
2366
2367 static ssize_t mport_write(struct file *filp, const char __user *buf,
2368 size_t count, loff_t *ppos)
2369 {
2370 struct mport_cdev_priv *priv = filp->private_data;
2371 struct rio_mport *mport = priv->md->mport;
2372 struct rio_event event;
2373 int len, ret;
2374
2375 if (!count)
2376 return 0;
2377
2378 if (count % sizeof(event))
2379 return -EINVAL;
2380
2381 len = 0;
2382 while ((count - len) >= (int)sizeof(event)) {
2383 if (copy_from_user(&event, buf, sizeof(event)))
2384 return -EFAULT;
2385
2386 if (event.header != RIO_DOORBELL)
2387 return -EINVAL;
2388
2389 ret = rio_mport_send_doorbell(mport,
2390 event.u.doorbell.rioid,
2391 event.u.doorbell.payload);
2392 if (ret < 0)
2393 return ret;
2394
2395 len += sizeof(event);
2396 buf += sizeof(event);
2397 }
2398
2399 return len;
2400 }
2401
2402 static const struct file_operations mport_fops = {
2403 .owner = THIS_MODULE,
2404 .open = mport_cdev_open,
2405 .release = mport_cdev_release,
2406 .poll = mport_cdev_poll,
2407 .read = mport_read,
2408 .write = mport_write,
2409 .mmap = mport_cdev_mmap,
2410 .fasync = mport_cdev_fasync,
2411 .unlocked_ioctl = mport_cdev_ioctl
2412 };
2413
2414 /*
2415 * Character device management
2416 */
2417
2418 static void mport_device_release(struct device *dev)
2419 {
2420 struct mport_dev *md;
2421
2422 rmcd_debug(EXIT, "%s", dev_name(dev));
2423 md = container_of(dev, struct mport_dev, dev);
2424 kfree(md);
2425 }
2426
2427 /*
2428 * mport_cdev_add() - Create mport_dev from rio_mport
2429 * @mport: RapidIO master port
2430 */
2431 static struct mport_dev *mport_cdev_add(struct rio_mport *mport)
2432 {
2433 int ret = 0;
2434 struct mport_dev *md;
2435 struct rio_mport_attr attr;
2436
2437 md = kzalloc(sizeof(*md), GFP_KERNEL);
2438 if (!md) {
2439 rmcd_error("Unable allocate a device object");
2440 return NULL;
2441 }
2442
2443 md->mport = mport;
2444 mutex_init(&md->buf_mutex);
2445 mutex_init(&md->file_mutex);
2446 INIT_LIST_HEAD(&md->file_list);
2447 cdev_init(&md->cdev, &mport_fops);
2448 md->cdev.owner = THIS_MODULE;
2449 ret = cdev_add(&md->cdev, MKDEV(MAJOR(dev_number), mport->id), 1);
2450 if (ret < 0) {
2451 kfree(md);
2452 rmcd_error("Unable to register a device, err=%d", ret);
2453 return NULL;
2454 }
2455
2456 md->dev.devt = md->cdev.dev;
2457 md->dev.class = dev_class;
2458 md->dev.parent = &mport->dev;
2459 md->dev.release = mport_device_release;
2460 dev_set_name(&md->dev, DEV_NAME "%d", mport->id);
2461 atomic_set(&md->active, 1);
2462
2463 ret = device_register(&md->dev);
2464 if (ret) {
2465 rmcd_error("Failed to register mport %d (err=%d)",
2466 mport->id, ret);
2467 goto err_cdev;
2468 }
2469
2470 get_device(&md->dev);
2471
2472 INIT_LIST_HEAD(&md->doorbells);
2473 spin_lock_init(&md->db_lock);
2474 INIT_LIST_HEAD(&md->portwrites);
2475 spin_lock_init(&md->pw_lock);
2476 INIT_LIST_HEAD(&md->mappings);
2477
2478 md->properties.id = mport->id;
2479 md->properties.sys_size = mport->sys_size;
2480 md->properties.hdid = mport->host_deviceid;
2481 md->properties.index = mport->index;
2482
2483 /* The transfer_mode property will be returned through mport query
2484 * interface
2485 */
2486 #ifdef CONFIG_FSL_RIO /* for now: only on Freescale's SoCs */
2487 md->properties.transfer_mode |= RIO_TRANSFER_MODE_MAPPED;
2488 #else
2489 md->properties.transfer_mode |= RIO_TRANSFER_MODE_TRANSFER;
2490 #endif
2491 ret = rio_query_mport(mport, &attr);
2492 if (!ret) {
2493 md->properties.flags = attr.flags;
2494 md->properties.link_speed = attr.link_speed;
2495 md->properties.link_width = attr.link_width;
2496 md->properties.dma_max_sge = attr.dma_max_sge;
2497 md->properties.dma_max_size = attr.dma_max_size;
2498 md->properties.dma_align = attr.dma_align;
2499 md->properties.cap_sys_size = 0;
2500 md->properties.cap_transfer_mode = 0;
2501 md->properties.cap_addr_size = 0;
2502 } else
2503 pr_info(DRV_PREFIX "Failed to obtain info for %s cdev(%d:%d)\n",
2504 mport->name, MAJOR(dev_number), mport->id);
2505
2506 mutex_lock(&mport_devs_lock);
2507 list_add_tail(&md->node, &mport_devs);
2508 mutex_unlock(&mport_devs_lock);
2509
2510 pr_info(DRV_PREFIX "Added %s cdev(%d:%d)\n",
2511 mport->name, MAJOR(dev_number), mport->id);
2512
2513 return md;
2514
2515 err_cdev:
2516 cdev_del(&md->cdev);
2517 kfree(md);
2518 return NULL;
2519 }
2520
2521 /*
2522 * mport_cdev_terminate_dma() - Stop all active DMA data transfers and release
2523 * associated DMA channels.
2524 */
2525 static void mport_cdev_terminate_dma(struct mport_dev *md)
2526 {
2527 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
2528 struct mport_cdev_priv *client;
2529
2530 rmcd_debug(DMA, "%s", dev_name(&md->dev));
2531
2532 mutex_lock(&md->file_mutex);
2533 list_for_each_entry(client, &md->file_list, list) {
2534 if (client->dmach) {
2535 dmaengine_terminate_all(client->dmach);
2536 rio_release_dma(client->dmach);
2537 }
2538 }
2539 mutex_unlock(&md->file_mutex);
2540
2541 if (md->dma_chan) {
2542 dmaengine_terminate_all(md->dma_chan);
2543 rio_release_dma(md->dma_chan);
2544 md->dma_chan = NULL;
2545 }
2546 #endif
2547 }
2548
2549
2550 /*
2551 * mport_cdev_kill_fasync() - Send SIGIO signal to all processes with open
2552 * mport_cdev files.
2553 */
2554 static int mport_cdev_kill_fasync(struct mport_dev *md)
2555 {
2556 unsigned int files = 0;
2557 struct mport_cdev_priv *client;
2558
2559 mutex_lock(&md->file_mutex);
2560 list_for_each_entry(client, &md->file_list, list) {
2561 if (client->async_queue)
2562 kill_fasync(&client->async_queue, SIGIO, POLL_HUP);
2563 files++;
2564 }
2565 mutex_unlock(&md->file_mutex);
2566 return files;
2567 }
2568
2569 /*
2570 * mport_cdev_remove() - Remove mport character device
2571 * @dev: Mport device to remove
2572 */
2573 static void mport_cdev_remove(struct mport_dev *md)
2574 {
2575 struct rio_mport_mapping *map, *_map;
2576
2577 rmcd_debug(EXIT, "Remove %s cdev", md->mport->name);
2578 atomic_set(&md->active, 0);
2579 mport_cdev_terminate_dma(md);
2580 rio_del_mport_pw_handler(md->mport, md, rio_mport_pw_handler);
2581 cdev_del(&(md->cdev));
2582 mport_cdev_kill_fasync(md);
2583
2584 flush_workqueue(dma_wq);
2585
2586 /* TODO: do we need to give clients some time to close file
2587 * descriptors? Simple wait for XX, or kref?
2588 */
2589
2590 /*
2591 * Release DMA buffers allocated for the mport device.
2592 * Disable associated inbound Rapidio requests mapping if applicable.
2593 */
2594 mutex_lock(&md->buf_mutex);
2595 list_for_each_entry_safe(map, _map, &md->mappings, node) {
2596 kref_put(&map->ref, mport_release_mapping);
2597 }
2598 mutex_unlock(&md->buf_mutex);
2599
2600 if (!list_empty(&md->mappings))
2601 rmcd_warn("WARNING: %s pending mappings on removal",
2602 md->mport->name);
2603
2604 rio_release_inb_dbell(md->mport, 0, 0x0fff);
2605
2606 device_unregister(&md->dev);
2607 put_device(&md->dev);
2608 }
2609
2610 /*
2611 * RIO rio_mport_interface driver
2612 */
2613
2614 /*
2615 * mport_add_mport() - Add rio_mport from LDM device struct
2616 * @dev: Linux device model struct
2617 * @class_intf: Linux class_interface
2618 */
2619 static int mport_add_mport(struct device *dev,
2620 struct class_interface *class_intf)
2621 {
2622 struct rio_mport *mport = NULL;
2623 struct mport_dev *chdev = NULL;
2624
2625 mport = to_rio_mport(dev);
2626 if (!mport)
2627 return -ENODEV;
2628
2629 chdev = mport_cdev_add(mport);
2630 if (!chdev)
2631 return -ENODEV;
2632
2633 return 0;
2634 }
2635
2636 /*
2637 * mport_remove_mport() - Remove rio_mport from global list
2638 * TODO remove device from global mport_dev list
2639 */
2640 static void mport_remove_mport(struct device *dev,
2641 struct class_interface *class_intf)
2642 {
2643 struct rio_mport *mport = NULL;
2644 struct mport_dev *chdev;
2645 int found = 0;
2646
2647 mport = to_rio_mport(dev);
2648 rmcd_debug(EXIT, "Remove %s", mport->name);
2649
2650 mutex_lock(&mport_devs_lock);
2651 list_for_each_entry(chdev, &mport_devs, node) {
2652 if (chdev->mport->id == mport->id) {
2653 atomic_set(&chdev->active, 0);
2654 list_del(&chdev->node);
2655 found = 1;
2656 break;
2657 }
2658 }
2659 mutex_unlock(&mport_devs_lock);
2660
2661 if (found)
2662 mport_cdev_remove(chdev);
2663 }
2664
2665 /* the rio_mport_interface is used to handle local mport devices */
2666 static struct class_interface rio_mport_interface __refdata = {
2667 .class = &rio_mport_class,
2668 .add_dev = mport_add_mport,
2669 .remove_dev = mport_remove_mport,
2670 };
2671
2672 /*
2673 * Linux kernel module
2674 */
2675
2676 /*
2677 * mport_init - Driver module loading
2678 */
2679 static int __init mport_init(void)
2680 {
2681 int ret;
2682
2683 /* Create device class needed by udev */
2684 dev_class = class_create(THIS_MODULE, DRV_NAME);
2685 if (IS_ERR(dev_class)) {
2686 rmcd_error("Unable to create " DRV_NAME " class");
2687 return PTR_ERR(dev_class);
2688 }
2689
2690 ret = alloc_chrdev_region(&dev_number, 0, RIO_MAX_MPORTS, DRV_NAME);
2691 if (ret < 0)
2692 goto err_chr;
2693
2694 rmcd_debug(INIT, "Registered class with major=%d", MAJOR(dev_number));
2695
2696 /* Register to rio_mport_interface */
2697 ret = class_interface_register(&rio_mport_interface);
2698 if (ret) {
2699 rmcd_error("class_interface_register() failed, err=%d", ret);
2700 goto err_cli;
2701 }
2702
2703 dma_wq = create_singlethread_workqueue("dma_wq");
2704 if (!dma_wq) {
2705 rmcd_error("failed to create DMA work queue");
2706 ret = -ENOMEM;
2707 goto err_wq;
2708 }
2709
2710 return 0;
2711
2712 err_wq:
2713 class_interface_unregister(&rio_mport_interface);
2714 err_cli:
2715 unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2716 err_chr:
2717 class_destroy(dev_class);
2718 return ret;
2719 }
2720
2721 /**
2722 * mport_exit - Driver module unloading
2723 */
2724 static void __exit mport_exit(void)
2725 {
2726 class_interface_unregister(&rio_mport_interface);
2727 class_destroy(dev_class);
2728 unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2729 destroy_workqueue(dma_wq);
2730 }
2731
2732 module_init(mport_init);
2733 module_exit(mport_exit);
Linux with added FPC-III support