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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / rapidio / devices / rio_mport_cdev.c
blob8155f59ece38d08eba6dbb8079ff880f6b482ec5
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * RapidIO mport character device
4 *
5 * Copyright 2014-2015 Integrated Device Technology, Inc.
6 * Alexandre Bounine <alexandre.bounine@idt.com>
7 * Copyright 2014-2015 Prodrive Technologies
8 * Andre van Herk <andre.van.herk@prodrive-technologies.com>
9 * Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>
10 * Copyright (C) 2014 Texas Instruments Incorporated
11 * Aurelien Jacquiot <a-jacquiot@ti.com>
12 */
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/cdev.h>
16 #include <linux/ioctl.h>
17 #include <linux/uaccess.h>
18 #include <linux/list.h>
19 #include <linux/fs.h>
20 #include <linux/err.h>
21 #include <linux/net.h>
22 #include <linux/poll.h>
23 #include <linux/spinlock.h>
24 #include <linux/sched.h>
25 #include <linux/kfifo.h>
26
27 #include <linux/mm.h>
28 #include <linux/slab.h>
29 #include <linux/vmalloc.h>
30 #include <linux/mman.h>
31
32 #include <linux/dma-mapping.h>
33 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
34 #include <linux/dmaengine.h>
35 #endif
36
37 #include <linux/rio.h>
38 #include <linux/rio_ids.h>
39 #include <linux/rio_drv.h>
40 #include <linux/rio_mport_cdev.h>
41
42 #include "../rio.h"
43
44 #define DRV_NAME "rio_mport"
45 #define DRV_PREFIX DRV_NAME ": "
46 #define DEV_NAME "rio_mport"
47 #define DRV_VERSION "1.0.0"
48
49 /* Debug output filtering masks */
50 enum {
51 DBG_NONE = 0,
52 DBG_INIT = BIT(0), /* driver init */
53 DBG_EXIT = BIT(1), /* driver exit */
54 DBG_MPORT = BIT(2), /* mport add/remove */
55 DBG_RDEV = BIT(3), /* RapidIO device add/remove */
56 DBG_DMA = BIT(4), /* DMA transfer messages */
57 DBG_MMAP = BIT(5), /* mapping messages */
58 DBG_IBW = BIT(6), /* inbound window */
59 DBG_EVENT = BIT(7), /* event handling messages */
60 DBG_OBW = BIT(8), /* outbound window messages */
61 DBG_DBELL = BIT(9), /* doorbell messages */
62 DBG_ALL = ~0,
63 };
64
65 #ifdef DEBUG
66 #define rmcd_debug(level, fmt, arg...) \
67 do { \
68 if (DBG_##level & dbg_level) \
69 pr_debug(DRV_PREFIX "%s: " fmt "\n", __func__, ##arg); \
70 } while (0)
71 #else
72 #define rmcd_debug(level, fmt, arg...) \
73 no_printk(KERN_DEBUG pr_fmt(DRV_PREFIX fmt "\n"), ##arg)
74 #endif
75
76 #define rmcd_warn(fmt, arg...) \
77 pr_warn(DRV_PREFIX "%s WARNING " fmt "\n", __func__, ##arg)
78
79 #define rmcd_error(fmt, arg...) \
80 pr_err(DRV_PREFIX "%s ERROR " fmt "\n", __func__, ##arg)
81
82 MODULE_AUTHOR("Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>");
83 MODULE_AUTHOR("Aurelien Jacquiot <a-jacquiot@ti.com>");
84 MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>");
85 MODULE_AUTHOR("Andre van Herk <andre.van.herk@prodrive-technologies.com>");
86 MODULE_DESCRIPTION("RapidIO mport character device driver");
87 MODULE_LICENSE("GPL");
88 MODULE_VERSION(DRV_VERSION);
89
90 static int dma_timeout = 3000; /* DMA transfer timeout in msec */
91 module_param(dma_timeout, int, S_IRUGO);
92 MODULE_PARM_DESC(dma_timeout, "DMA Transfer Timeout in msec (default: 3000)");
93
94 #ifdef DEBUG
95 static u32 dbg_level = DBG_NONE;
96 module_param(dbg_level, uint, S_IWUSR | S_IWGRP | S_IRUGO);
97 MODULE_PARM_DESC(dbg_level, "Debugging output level (default 0 = none)");
98 #endif
99
100 /*
101 * An internal DMA coherent buffer
102 */
103 struct mport_dma_buf {
104 void *ib_base;
105 dma_addr_t ib_phys;
106 u32 ib_size;
107 u64 ib_rio_base;
108 bool ib_map;
109 struct file *filp;
110 };
111
112 /*
113 * Internal memory mapping structure
114 */
115 enum rio_mport_map_dir {
116 MAP_INBOUND,
117 MAP_OUTBOUND,
118 MAP_DMA,
119 };
120
121 struct rio_mport_mapping {
122 struct list_head node;
123 struct mport_dev *md;
124 enum rio_mport_map_dir dir;
125 u16 rioid;
126 u64 rio_addr;
127 dma_addr_t phys_addr; /* for mmap */
128 void *virt_addr; /* kernel address, for dma_free_coherent */
129 u64 size;
130 struct kref ref; /* refcount of vmas sharing the mapping */
131 struct file *filp;
132 };
133
134 struct rio_mport_dma_map {
135 int valid;
136 u64 length;
137 void *vaddr;
138 dma_addr_t paddr;
139 };
140
141 #define MPORT_MAX_DMA_BUFS 16
142 #define MPORT_EVENT_DEPTH 10
143
144 /*
145 * mport_dev driver-specific structure that represents mport device
146 * @active mport device status flag
147 * @node list node to maintain list of registered mports
148 * @cdev character device
149 * @dev associated device object
150 * @mport associated subsystem's master port device object
151 * @buf_mutex lock for buffer handling
152 * @file_mutex - lock for open files list
153 * @file_list - list of open files on given mport
154 * @properties properties of this mport
155 * @portwrites queue of inbound portwrites
156 * @pw_lock lock for port write queue
157 * @mappings queue for memory mappings
158 * @dma_chan DMA channels associated with this device
159 * @dma_ref:
160 * @comp:
161 */
162 struct mport_dev {
163 atomic_t active;
164 struct list_head node;
165 struct cdev cdev;
166 struct device dev;
167 struct rio_mport *mport;
168 struct mutex buf_mutex;
169 struct mutex file_mutex;
170 struct list_head file_list;
171 struct rio_mport_properties properties;
172 struct list_head doorbells;
173 spinlock_t db_lock;
174 struct list_head portwrites;
175 spinlock_t pw_lock;
176 struct list_head mappings;
177 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
178 struct dma_chan *dma_chan;
179 struct kref dma_ref;
180 struct completion comp;
181 #endif
182 };
183
184 /*
185 * mport_cdev_priv - data structure specific to individual file object
186 * associated with an open device
187 * @md master port character device object
188 * @async_queue - asynchronous notification queue
189 * @list - file objects tracking list
190 * @db_filters inbound doorbell filters for this descriptor
191 * @pw_filters portwrite filters for this descriptor
192 * @event_fifo event fifo for this descriptor
193 * @event_rx_wait wait queue for this descriptor
194 * @fifo_lock lock for event_fifo
195 * @event_mask event mask for this descriptor
196 * @dmach DMA engine channel allocated for specific file object
197 */
198 struct mport_cdev_priv {
199 struct mport_dev *md;
200 struct fasync_struct *async_queue;
201 struct list_head list;
202 struct list_head db_filters;
203 struct list_head pw_filters;
204 struct kfifo event_fifo;
205 wait_queue_head_t event_rx_wait;
206 spinlock_t fifo_lock;
207 u32 event_mask; /* RIO_DOORBELL, RIO_PORTWRITE */
208 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
209 struct dma_chan *dmach;
210 struct list_head async_list;
211 spinlock_t req_lock;
212 struct mutex dma_lock;
213 struct kref dma_ref;
214 struct completion comp;
215 #endif
216 };
217
218 /*
219 * rio_mport_pw_filter - structure to describe a portwrite filter
220 * md_node node in mport device's list
221 * priv_node node in private file object's list
222 * priv reference to private data
223 * filter actual portwrite filter
224 */
225 struct rio_mport_pw_filter {
226 struct list_head md_node;
227 struct list_head priv_node;
228 struct mport_cdev_priv *priv;
229 struct rio_pw_filter filter;
230 };
231
232 /*
233 * rio_mport_db_filter - structure to describe a doorbell filter
234 * @data_node reference to device node
235 * @priv_node node in private data
236 * @priv reference to private data
237 * @filter actual doorbell filter
238 */
239 struct rio_mport_db_filter {
240 struct list_head data_node;
241 struct list_head priv_node;
242 struct mport_cdev_priv *priv;
243 struct rio_doorbell_filter filter;
244 };
245
246 static LIST_HEAD(mport_devs);
247 static DEFINE_MUTEX(mport_devs_lock);
248
249 #if (0) /* used by commented out portion of poll function : FIXME */
250 static DECLARE_WAIT_QUEUE_HEAD(mport_cdev_wait);
251 #endif
252
253 static struct class *dev_class;
254 static dev_t dev_number;
255
256 static void mport_release_mapping(struct kref *ref);
257
258 static int rio_mport_maint_rd(struct mport_cdev_priv *priv, void __user *arg,
259 int local)
260 {
261 struct rio_mport *mport = priv->md->mport;
262 struct rio_mport_maint_io maint_io;
263 u32 *buffer;
264 u32 offset;
265 size_t length;
266 int ret, i;
267
268 if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
269 return -EFAULT;
270
271 if ((maint_io.offset % 4) ||
272 (maint_io.length == 0) || (maint_io.length % 4) ||
273 (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ)
274 return -EINVAL;
275
276 buffer = vmalloc(maint_io.length);
277 if (buffer == NULL)
278 return -ENOMEM;
279 length = maint_io.length/sizeof(u32);
280 offset = maint_io.offset;
281
282 for (i = 0; i < length; i++) {
283 if (local)
284 ret = __rio_local_read_config_32(mport,
285 offset, &buffer[i]);
286 else
287 ret = rio_mport_read_config_32(mport, maint_io.rioid,
288 maint_io.hopcount, offset, &buffer[i]);
289 if (ret)
290 goto out;
291
292 offset += 4;
293 }
294
295 if (unlikely(copy_to_user((void __user *)(uintptr_t)maint_io.buffer,
296 buffer, maint_io.length)))
297 ret = -EFAULT;
298 out:
299 vfree(buffer);
300 return ret;
301 }
302
303 static int rio_mport_maint_wr(struct mport_cdev_priv *priv, void __user *arg,
304 int local)
305 {
306 struct rio_mport *mport = priv->md->mport;
307 struct rio_mport_maint_io maint_io;
308 u32 *buffer;
309 u32 offset;
310 size_t length;
311 int ret = -EINVAL, i;
312
313 if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
314 return -EFAULT;
315
316 if ((maint_io.offset % 4) ||
317 (maint_io.length == 0) || (maint_io.length % 4) ||
318 (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ)
319 return -EINVAL;
320
321 buffer = vmalloc(maint_io.length);
322 if (buffer == NULL)
323 return -ENOMEM;
324 length = maint_io.length;
325
326 if (unlikely(copy_from_user(buffer,
327 (void __user *)(uintptr_t)maint_io.buffer, length))) {
328 ret = -EFAULT;
329 goto out;
330 }
331
332 offset = maint_io.offset;
333 length /= sizeof(u32);
334
335 for (i = 0; i < length; i++) {
336 if (local)
337 ret = __rio_local_write_config_32(mport,
338 offset, buffer[i]);
339 else
340 ret = rio_mport_write_config_32(mport, maint_io.rioid,
341 maint_io.hopcount,
342 offset, buffer[i]);
343 if (ret)
344 goto out;
345
346 offset += 4;
347 }
348
349 out:
350 vfree(buffer);
351 return ret;
352 }
353
354
355 /*
356 * Inbound/outbound memory mapping functions
357 */
358 static int
359 rio_mport_create_outbound_mapping(struct mport_dev *md, struct file *filp,
360 u16 rioid, u64 raddr, u32 size,
361 dma_addr_t *paddr)
362 {
363 struct rio_mport *mport = md->mport;
364 struct rio_mport_mapping *map;
365 int ret;
366
367 rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%x", rioid, raddr, size);
368
369 map = kzalloc(sizeof(*map), GFP_KERNEL);
370 if (map == NULL)
371 return -ENOMEM;
372
373 ret = rio_map_outb_region(mport, rioid, raddr, size, 0, paddr);
374 if (ret < 0)
375 goto err_map_outb;
376
377 map->dir = MAP_OUTBOUND;
378 map->rioid = rioid;
379 map->rio_addr = raddr;
380 map->size = size;
381 map->phys_addr = *paddr;
382 map->filp = filp;
383 map->md = md;
384 kref_init(&map->ref);
385 list_add_tail(&map->node, &md->mappings);
386 return 0;
387 err_map_outb:
388 kfree(map);
389 return ret;
390 }
391
392 static int
393 rio_mport_get_outbound_mapping(struct mport_dev *md, struct file *filp,
394 u16 rioid, u64 raddr, u32 size,
395 dma_addr_t *paddr)
396 {
397 struct rio_mport_mapping *map;
398 int err = -ENOMEM;
399
400 mutex_lock(&md->buf_mutex);
401 list_for_each_entry(map, &md->mappings, node) {
402 if (map->dir != MAP_OUTBOUND)
403 continue;
404 if (rioid == map->rioid &&
405 raddr == map->rio_addr && size == map->size) {
406 *paddr = map->phys_addr;
407 err = 0;
408 break;
409 } else if (rioid == map->rioid &&
410 raddr < (map->rio_addr + map->size - 1) &&
411 (raddr + size) > map->rio_addr) {
412 err = -EBUSY;
413 break;
414 }
415 }
416
417 /* If not found, create new */
418 if (err == -ENOMEM)
419 err = rio_mport_create_outbound_mapping(md, filp, rioid, raddr,
420 size, paddr);
421 mutex_unlock(&md->buf_mutex);
422 return err;
423 }
424
425 static int rio_mport_obw_map(struct file *filp, void __user *arg)
426 {
427 struct mport_cdev_priv *priv = filp->private_data;
428 struct mport_dev *data = priv->md;
429 struct rio_mmap map;
430 dma_addr_t paddr;
431 int ret;
432
433 if (unlikely(copy_from_user(&map, arg, sizeof(map))))
434 return -EFAULT;
435
436 rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%llx",
437 map.rioid, map.rio_addr, map.length);
438
439 ret = rio_mport_get_outbound_mapping(data, filp, map.rioid,
440 map.rio_addr, map.length, &paddr);
441 if (ret < 0) {
442 rmcd_error("Failed to set OBW err= %d", ret);
443 return ret;
444 }
445
446 map.handle = paddr;
447
448 if (unlikely(copy_to_user(arg, &map, sizeof(map))))
449 return -EFAULT;
450 return 0;
451 }
452
453 /*
454 * rio_mport_obw_free() - unmap an OutBound Window from RapidIO address space
455 *
456 * @priv: driver private data
457 * @arg: buffer handle returned by allocation routine
458 */
459 static int rio_mport_obw_free(struct file *filp, void __user *arg)
460 {
461 struct mport_cdev_priv *priv = filp->private_data;
462 struct mport_dev *md = priv->md;
463 u64 handle;
464 struct rio_mport_mapping *map, *_map;
465
466 if (!md->mport->ops->unmap_outb)
467 return -EPROTONOSUPPORT;
468
469 if (copy_from_user(&handle, arg, sizeof(handle)))
470 return -EFAULT;
471
472 rmcd_debug(OBW, "h=0x%llx", handle);
473
474 mutex_lock(&md->buf_mutex);
475 list_for_each_entry_safe(map, _map, &md->mappings, node) {
476 if (map->dir == MAP_OUTBOUND && map->phys_addr == handle) {
477 if (map->filp == filp) {
478 rmcd_debug(OBW, "kref_put h=0x%llx", handle);
479 map->filp = NULL;
480 kref_put(&map->ref, mport_release_mapping);
481 }
482 break;
483 }
484 }
485 mutex_unlock(&md->buf_mutex);
486
487 return 0;
488 }
489
490 /*
491 * maint_hdid_set() - Set the host Device ID
492 * @priv: driver private data
493 * @arg: Device Id
494 */
495 static int maint_hdid_set(struct mport_cdev_priv *priv, void __user *arg)
496 {
497 struct mport_dev *md = priv->md;
498 u16 hdid;
499
500 if (copy_from_user(&hdid, arg, sizeof(hdid)))
501 return -EFAULT;
502
503 md->mport->host_deviceid = hdid;
504 md->properties.hdid = hdid;
505 rio_local_set_device_id(md->mport, hdid);
506
507 rmcd_debug(MPORT, "Set host device Id to %d", hdid);
508
509 return 0;
510 }
511
512 /*
513 * maint_comptag_set() - Set the host Component Tag
514 * @priv: driver private data
515 * @arg: Component Tag
516 */
517 static int maint_comptag_set(struct mport_cdev_priv *priv, void __user *arg)
518 {
519 struct mport_dev *md = priv->md;
520 u32 comptag;
521
522 if (copy_from_user(&comptag, arg, sizeof(comptag)))
523 return -EFAULT;
524
525 rio_local_write_config_32(md->mport, RIO_COMPONENT_TAG_CSR, comptag);
526
527 rmcd_debug(MPORT, "Set host Component Tag to %d", comptag);
528
529 return 0;
530 }
531
532 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
533
534 struct mport_dma_req {
535 struct kref refcount;
536 struct list_head node;
537 struct file *filp;
538 struct mport_cdev_priv *priv;
539 enum rio_transfer_sync sync;
540 struct sg_table sgt;
541 struct page **page_list;
542 unsigned int nr_pages;
543 struct rio_mport_mapping *map;
544 struct dma_chan *dmach;
545 enum dma_data_direction dir;
546 dma_cookie_t cookie;
547 enum dma_status status;
548 struct completion req_comp;
549 };
550
551 static void mport_release_def_dma(struct kref *dma_ref)
552 {
553 struct mport_dev *md =
554 container_of(dma_ref, struct mport_dev, dma_ref);
555
556 rmcd_debug(EXIT, "DMA_%d", md->dma_chan->chan_id);
557 rio_release_dma(md->dma_chan);
558 md->dma_chan = NULL;
559 }
560
561 static void mport_release_dma(struct kref *dma_ref)
562 {
563 struct mport_cdev_priv *priv =
564 container_of(dma_ref, struct mport_cdev_priv, dma_ref);
565
566 rmcd_debug(EXIT, "DMA_%d", priv->dmach->chan_id);
567 complete(&priv->comp);
568 }
569
570 static void dma_req_free(struct kref *ref)
571 {
572 struct mport_dma_req *req = container_of(ref, struct mport_dma_req,
573 refcount);
574 struct mport_cdev_priv *priv = req->priv;
575 unsigned int i;
576
577 dma_unmap_sg(req->dmach->device->dev,
578 req->sgt.sgl, req->sgt.nents, req->dir);
579 sg_free_table(&req->sgt);
580 if (req->page_list) {
581 for (i = 0; i < req->nr_pages; i++)
582 put_page(req->page_list[i]);
583 kfree(req->page_list);
584 }
585
586 if (req->map) {
587 mutex_lock(&req->map->md->buf_mutex);
588 kref_put(&req->map->ref, mport_release_mapping);
589 mutex_unlock(&req->map->md->buf_mutex);
590 }
591
592 kref_put(&priv->dma_ref, mport_release_dma);
593
594 kfree(req);
595 }
596
597 static void dma_xfer_callback(void *param)
598 {
599 struct mport_dma_req *req = (struct mport_dma_req *)param;
600 struct mport_cdev_priv *priv = req->priv;
601
602 req->status = dma_async_is_tx_complete(priv->dmach, req->cookie,
603 NULL, NULL);
604 complete(&req->req_comp);
605 kref_put(&req->refcount, dma_req_free);
606 }
607
608 /*
609 * prep_dma_xfer() - Configure and send request to DMAengine to prepare DMA
610 * transfer object.
611 * Returns pointer to DMA transaction descriptor allocated by DMA driver on
612 * success or ERR_PTR (and/or NULL) if failed. Caller must check returned
613 * non-NULL pointer using IS_ERR macro.
614 */
615 static struct dma_async_tx_descriptor
616 *prep_dma_xfer(struct dma_chan *chan, struct rio_transfer_io *transfer,
617 struct sg_table *sgt, int nents, enum dma_transfer_direction dir,
618 enum dma_ctrl_flags flags)
619 {
620 struct rio_dma_data tx_data;
621
622 tx_data.sg = sgt->sgl;
623 tx_data.sg_len = nents;
624 tx_data.rio_addr_u = 0;
625 tx_data.rio_addr = transfer->rio_addr;
626 if (dir == DMA_MEM_TO_DEV) {
627 switch (transfer->method) {
628 case RIO_EXCHANGE_NWRITE:
629 tx_data.wr_type = RDW_ALL_NWRITE;
630 break;
631 case RIO_EXCHANGE_NWRITE_R_ALL:
632 tx_data.wr_type = RDW_ALL_NWRITE_R;
633 break;
634 case RIO_EXCHANGE_NWRITE_R:
635 tx_data.wr_type = RDW_LAST_NWRITE_R;
636 break;
637 case RIO_EXCHANGE_DEFAULT:
638 tx_data.wr_type = RDW_DEFAULT;
639 break;
640 default:
641 return ERR_PTR(-EINVAL);
642 }
643 }
644
645 return rio_dma_prep_xfer(chan, transfer->rioid, &tx_data, dir, flags);
646 }
647
648 /* Request DMA channel associated with this mport device.
649 * Try to request DMA channel for every new process that opened given
650 * mport. If a new DMA channel is not available use default channel
651 * which is the first DMA channel opened on mport device.
652 */
653 static int get_dma_channel(struct mport_cdev_priv *priv)
654 {
655 mutex_lock(&priv->dma_lock);
656 if (!priv->dmach) {
657 priv->dmach = rio_request_mport_dma(priv->md->mport);
658 if (!priv->dmach) {
659 /* Use default DMA channel if available */
660 if (priv->md->dma_chan) {
661 priv->dmach = priv->md->dma_chan;
662 kref_get(&priv->md->dma_ref);
663 } else {
664 rmcd_error("Failed to get DMA channel");
665 mutex_unlock(&priv->dma_lock);
666 return -ENODEV;
667 }
668 } else if (!priv->md->dma_chan) {
669 /* Register default DMA channel if we do not have one */
670 priv->md->dma_chan = priv->dmach;
671 kref_init(&priv->md->dma_ref);
672 rmcd_debug(DMA, "Register DMA_chan %d as default",
673 priv->dmach->chan_id);
674 }
675
676 kref_init(&priv->dma_ref);
677 init_completion(&priv->comp);
678 }
679
680 kref_get(&priv->dma_ref);
681 mutex_unlock(&priv->dma_lock);
682 return 0;
683 }
684
685 static void put_dma_channel(struct mport_cdev_priv *priv)
686 {
687 kref_put(&priv->dma_ref, mport_release_dma);
688 }
689
690 /*
691 * DMA transfer functions
692 */
693 static int do_dma_request(struct mport_dma_req *req,
694 struct rio_transfer_io *xfer,
695 enum rio_transfer_sync sync, int nents)
696 {
697 struct mport_cdev_priv *priv;
698 struct sg_table *sgt;
699 struct dma_chan *chan;
700 struct dma_async_tx_descriptor *tx;
701 dma_cookie_t cookie;
702 unsigned long tmo = msecs_to_jiffies(dma_timeout);
703 enum dma_transfer_direction dir;
704 long wret;
705 int ret = 0;
706
707 priv = req->priv;
708 sgt = &req->sgt;
709
710 chan = priv->dmach;
711 dir = (req->dir == DMA_FROM_DEVICE) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
712
713 rmcd_debug(DMA, "%s(%d) uses %s for DMA_%s",
714 current->comm, task_pid_nr(current),
715 dev_name(&chan->dev->device),
716 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE");
717
718 /* Initialize DMA transaction request */
719 tx = prep_dma_xfer(chan, xfer, sgt, nents, dir,
720 DMA_CTRL_ACK | DMA_PREP_INTERRUPT);
721
722 if (!tx) {
723 rmcd_debug(DMA, "prep error for %s A:0x%llx L:0x%llx",
724 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
725 xfer->rio_addr, xfer->length);
726 ret = -EIO;
727 goto err_out;
728 } else if (IS_ERR(tx)) {
729 ret = PTR_ERR(tx);
730 rmcd_debug(DMA, "prep error %d for %s A:0x%llx L:0x%llx", ret,
731 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
732 xfer->rio_addr, xfer->length);
733 goto err_out;
734 }
735
736 tx->callback = dma_xfer_callback;
737 tx->callback_param = req;
738
739 req->status = DMA_IN_PROGRESS;
740 kref_get(&req->refcount);
741
742 cookie = dmaengine_submit(tx);
743 req->cookie = cookie;
744
745 rmcd_debug(DMA, "pid=%d DMA_%s tx_cookie = %d", task_pid_nr(current),
746 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
747
748 if (dma_submit_error(cookie)) {
749 rmcd_error("submit err=%d (addr:0x%llx len:0x%llx)",
750 cookie, xfer->rio_addr, xfer->length);
751 kref_put(&req->refcount, dma_req_free);
752 ret = -EIO;
753 goto err_out;
754 }
755
756 dma_async_issue_pending(chan);
757
758 if (sync == RIO_TRANSFER_ASYNC) {
759 spin_lock(&priv->req_lock);
760 list_add_tail(&req->node, &priv->async_list);
761 spin_unlock(&priv->req_lock);
762 return cookie;
763 } else if (sync == RIO_TRANSFER_FAF)
764 return 0;
765
766 wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);
767
768 if (wret == 0) {
769 /* Timeout on wait occurred */
770 rmcd_error("%s(%d) timed out waiting for DMA_%s %d",
771 current->comm, task_pid_nr(current),
772 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
773 return -ETIMEDOUT;
774 } else if (wret == -ERESTARTSYS) {
775 /* Wait_for_completion was interrupted by a signal but DMA may
776 * be in progress
777 */
778 rmcd_error("%s(%d) wait for DMA_%s %d was interrupted",
779 current->comm, task_pid_nr(current),
780 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
781 return -EINTR;
782 }
783
784 if (req->status != DMA_COMPLETE) {
785 /* DMA transaction completion was signaled with error */
786 rmcd_error("%s(%d) DMA_%s %d completed with status %d (ret=%d)",
787 current->comm, task_pid_nr(current),
788 (dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
789 cookie, req->status, ret);
790 ret = -EIO;
791 }
792
793 err_out:
794 return ret;
795 }
796
797 /*
798 * rio_dma_transfer() - Perform RapidIO DMA data transfer to/from
799 * the remote RapidIO device
800 * @filp: file pointer associated with the call
801 * @transfer_mode: DMA transfer mode
802 * @sync: synchronization mode
803 * @dir: DMA transfer direction (DMA_MEM_TO_DEV = write OR
804 * DMA_DEV_TO_MEM = read)
805 * @xfer: data transfer descriptor structure
806 */
807 static int
808 rio_dma_transfer(struct file *filp, u32 transfer_mode,
809 enum rio_transfer_sync sync, enum dma_data_direction dir,
810 struct rio_transfer_io *xfer)
811 {
812 struct mport_cdev_priv *priv = filp->private_data;
813 unsigned long nr_pages = 0;
814 struct page **page_list = NULL;
815 struct mport_dma_req *req;
816 struct mport_dev *md = priv->md;
817 struct dma_chan *chan;
818 int i, ret;
819 int nents;
820
821 if (xfer->length == 0)
822 return -EINVAL;
823 req = kzalloc(sizeof(*req), GFP_KERNEL);
824 if (!req)
825 return -ENOMEM;
826
827 ret = get_dma_channel(priv);
828 if (ret) {
829 kfree(req);
830 return ret;
831 }
832 chan = priv->dmach;
833
834 kref_init(&req->refcount);
835 init_completion(&req->req_comp);
836 req->dir = dir;
837 req->filp = filp;
838 req->priv = priv;
839 req->dmach = chan;
840 req->sync = sync;
841
842 /*
843 * If parameter loc_addr != NULL, we are transferring data from/to
844 * data buffer allocated in user-space: lock in memory user-space
845 * buffer pages and build an SG table for DMA transfer request
846 *
847 * Otherwise (loc_addr == NULL) contiguous kernel-space buffer is
848 * used for DMA data transfers: build single entry SG table using
849 * offset within the internal buffer specified by handle parameter.
850 */
851 if (xfer->loc_addr) {
852 unsigned int offset;
853 long pinned;
854
855 offset = lower_32_bits(offset_in_page(xfer->loc_addr));
856 nr_pages = PAGE_ALIGN(xfer->length + offset) >> PAGE_SHIFT;
857
858 page_list = kmalloc_array(nr_pages,
859 sizeof(*page_list), GFP_KERNEL);
860 if (page_list == NULL) {
861 ret = -ENOMEM;
862 goto err_req;
863 }
864
865 pinned = get_user_pages_fast(
866 (unsigned long)xfer->loc_addr & PAGE_MASK,
867 nr_pages,
868 dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0,
869 page_list);
870
871 if (pinned != nr_pages) {
872 if (pinned < 0) {
873 rmcd_error("get_user_pages_unlocked err=%ld",
874 pinned);
875 nr_pages = 0;
876 } else
877 rmcd_error("pinned %ld out of %ld pages",
878 pinned, nr_pages);
879 ret = -EFAULT;
880 goto err_pg;
881 }
882
883 ret = sg_alloc_table_from_pages(&req->sgt, page_list, nr_pages,
884 offset, xfer->length, GFP_KERNEL);
885 if (ret) {
886 rmcd_error("sg_alloc_table failed with err=%d", ret);
887 goto err_pg;
888 }
889
890 req->page_list = page_list;
891 req->nr_pages = nr_pages;
892 } else {
893 dma_addr_t baddr;
894 struct rio_mport_mapping *map;
895
896 baddr = (dma_addr_t)xfer->handle;
897
898 mutex_lock(&md->buf_mutex);
899 list_for_each_entry(map, &md->mappings, node) {
900 if (baddr >= map->phys_addr &&
901 baddr < (map->phys_addr + map->size)) {
902 kref_get(&map->ref);
903 req->map = map;
904 break;
905 }
906 }
907 mutex_unlock(&md->buf_mutex);
908
909 if (req->map == NULL) {
910 ret = -ENOMEM;
911 goto err_req;
912 }
913
914 if (xfer->length + xfer->offset > map->size) {
915 ret = -EINVAL;
916 goto err_req;
917 }
918
919 ret = sg_alloc_table(&req->sgt, 1, GFP_KERNEL);
920 if (unlikely(ret)) {
921 rmcd_error("sg_alloc_table failed for internal buf");
922 goto err_req;
923 }
924
925 sg_set_buf(req->sgt.sgl,
926 map->virt_addr + (baddr - map->phys_addr) +
927 xfer->offset, xfer->length);
928 }
929
930 nents = dma_map_sg(chan->device->dev,
931 req->sgt.sgl, req->sgt.nents, dir);
932 if (nents == 0) {
933 rmcd_error("Failed to map SG list");
934 ret = -EFAULT;
935 goto err_pg;
936 }
937
938 ret = do_dma_request(req, xfer, sync, nents);
939
940 if (ret >= 0) {
941 if (sync == RIO_TRANSFER_ASYNC)
942 return ret; /* return ASYNC cookie */
943 } else {
944 rmcd_debug(DMA, "do_dma_request failed with err=%d", ret);
945 }
946
947 err_pg:
948 if (!req->page_list) {
949 for (i = 0; i < nr_pages; i++)
950 put_page(page_list[i]);
951 kfree(page_list);
952 }
953 err_req:
954 kref_put(&req->refcount, dma_req_free);
955 return ret;
956 }
957
958 static int rio_mport_transfer_ioctl(struct file *filp, void __user *arg)
959 {
960 struct mport_cdev_priv *priv = filp->private_data;
961 struct rio_transaction transaction;
962 struct rio_transfer_io *transfer;
963 enum dma_data_direction dir;
964 int i, ret = 0;
965
966 if (unlikely(copy_from_user(&transaction, arg, sizeof(transaction))))
967 return -EFAULT;
968
969 if (transaction.count != 1) /* only single transfer for now */
970 return -EINVAL;
971
972 if ((transaction.transfer_mode &
973 priv->md->properties.transfer_mode) == 0)
974 return -ENODEV;
975
976 transfer = vmalloc(array_size(sizeof(*transfer), transaction.count));
977 if (!transfer)
978 return -ENOMEM;
979
980 if (unlikely(copy_from_user(transfer,
981 (void __user *)(uintptr_t)transaction.block,
982 transaction.count * sizeof(*transfer)))) {
983 ret = -EFAULT;
984 goto out_free;
985 }
986
987 dir = (transaction.dir == RIO_TRANSFER_DIR_READ) ?
988 DMA_FROM_DEVICE : DMA_TO_DEVICE;
989 for (i = 0; i < transaction.count && ret == 0; i++)
990 ret = rio_dma_transfer(filp, transaction.transfer_mode,
991 transaction.sync, dir, &transfer[i]);
992
993 if (unlikely(copy_to_user((void __user *)(uintptr_t)transaction.block,
994 transfer,
995 transaction.count * sizeof(*transfer))))
996 ret = -EFAULT;
997
998 out_free:
999 vfree(transfer);
1000
1001 return ret;
1002 }
1003
1004 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1005 {
1006 struct mport_cdev_priv *priv;
1007 struct rio_async_tx_wait w_param;
1008 struct mport_dma_req *req;
1009 dma_cookie_t cookie;
1010 unsigned long tmo;
1011 long wret;
1012 int found = 0;
1013 int ret;
1014
1015 priv = (struct mport_cdev_priv *)filp->private_data;
1016
1017 if (unlikely(copy_from_user(&w_param, arg, sizeof(w_param))))
1018 return -EFAULT;
1019
1020 cookie = w_param.token;
1021 if (w_param.timeout)
1022 tmo = msecs_to_jiffies(w_param.timeout);
1023 else /* Use default DMA timeout */
1024 tmo = msecs_to_jiffies(dma_timeout);
1025
1026 spin_lock(&priv->req_lock);
1027 list_for_each_entry(req, &priv->async_list, node) {
1028 if (req->cookie == cookie) {
1029 list_del(&req->node);
1030 found = 1;
1031 break;
1032 }
1033 }
1034 spin_unlock(&priv->req_lock);
1035
1036 if (!found)
1037 return -EAGAIN;
1038
1039 wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);
1040
1041 if (wret == 0) {
1042 /* Timeout on wait occurred */
1043 rmcd_error("%s(%d) timed out waiting for ASYNC DMA_%s",
1044 current->comm, task_pid_nr(current),
1045 (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
1046 ret = -ETIMEDOUT;
1047 goto err_tmo;
1048 } else if (wret == -ERESTARTSYS) {
1049 /* Wait_for_completion was interrupted by a signal but DMA may
1050 * be still in progress
1051 */
1052 rmcd_error("%s(%d) wait for ASYNC DMA_%s was interrupted",
1053 current->comm, task_pid_nr(current),
1054 (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
1055 ret = -EINTR;
1056 goto err_tmo;
1057 }
1058
1059 if (req->status != DMA_COMPLETE) {
1060 /* DMA transaction completion signaled with transfer error */
1061 rmcd_error("%s(%d) ASYNC DMA_%s completion with status %d",
1062 current->comm, task_pid_nr(current),
1063 (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE",
1064 req->status);
1065 ret = -EIO;
1066 } else
1067 ret = 0;
1068
1069 if (req->status != DMA_IN_PROGRESS && req->status != DMA_PAUSED)
1070 kref_put(&req->refcount, dma_req_free);
1071
1072 return ret;
1073
1074 err_tmo:
1075 /* Return request back into async queue */
1076 spin_lock(&priv->req_lock);
1077 list_add_tail(&req->node, &priv->async_list);
1078 spin_unlock(&priv->req_lock);
1079 return ret;
1080 }
1081
1082 static int rio_mport_create_dma_mapping(struct mport_dev *md, struct file *filp,
1083 u64 size, struct rio_mport_mapping **mapping)
1084 {
1085 struct rio_mport_mapping *map;
1086
1087 map = kzalloc(sizeof(*map), GFP_KERNEL);
1088 if (map == NULL)
1089 return -ENOMEM;
1090
1091 map->virt_addr = dma_alloc_coherent(md->mport->dev.parent, size,
1092 &map->phys_addr, GFP_KERNEL);
1093 if (map->virt_addr == NULL) {
1094 kfree(map);
1095 return -ENOMEM;
1096 }
1097
1098 map->dir = MAP_DMA;
1099 map->size = size;
1100 map->filp = filp;
1101 map->md = md;
1102 kref_init(&map->ref);
1103 mutex_lock(&md->buf_mutex);
1104 list_add_tail(&map->node, &md->mappings);
1105 mutex_unlock(&md->buf_mutex);
1106 *mapping = map;
1107
1108 return 0;
1109 }
1110
1111 static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1112 {
1113 struct mport_cdev_priv *priv = filp->private_data;
1114 struct mport_dev *md = priv->md;
1115 struct rio_dma_mem map;
1116 struct rio_mport_mapping *mapping = NULL;
1117 int ret;
1118
1119 if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1120 return -EFAULT;
1121
1122 ret = rio_mport_create_dma_mapping(md, filp, map.length, &mapping);
1123 if (ret)
1124 return ret;
1125
1126 map.dma_handle = mapping->phys_addr;
1127
1128 if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1129 mutex_lock(&md->buf_mutex);
1130 kref_put(&mapping->ref, mport_release_mapping);
1131 mutex_unlock(&md->buf_mutex);
1132 return -EFAULT;
1133 }
1134
1135 return 0;
1136 }
1137
1138 static int rio_mport_free_dma(struct file *filp, void __user *arg)
1139 {
1140 struct mport_cdev_priv *priv = filp->private_data;
1141 struct mport_dev *md = priv->md;
1142 u64 handle;
1143 int ret = -EFAULT;
1144 struct rio_mport_mapping *map, *_map;
1145
1146 if (copy_from_user(&handle, arg, sizeof(handle)))
1147 return -EFAULT;
1148 rmcd_debug(EXIT, "filp=%p", filp);
1149
1150 mutex_lock(&md->buf_mutex);
1151 list_for_each_entry_safe(map, _map, &md->mappings, node) {
1152 if (map->dir == MAP_DMA && map->phys_addr == handle &&
1153 map->filp == filp) {
1154 kref_put(&map->ref, mport_release_mapping);
1155 ret = 0;
1156 break;
1157 }
1158 }
1159 mutex_unlock(&md->buf_mutex);
1160
1161 if (ret == -EFAULT) {
1162 rmcd_debug(DMA, "ERR no matching mapping");
1163 return ret;
1164 }
1165
1166 return 0;
1167 }
1168 #else
1169 static int rio_mport_transfer_ioctl(struct file *filp, void *arg)
1170 {
1171 return -ENODEV;
1172 }
1173
1174 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1175 {
1176 return -ENODEV;
1177 }
1178
1179 static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1180 {
1181 return -ENODEV;
1182 }
1183
1184 static int rio_mport_free_dma(struct file *filp, void __user *arg)
1185 {
1186 return -ENODEV;
1187 }
1188 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1189
1190 /*
1191 * Inbound/outbound memory mapping functions
1192 */
1193
1194 static int
1195 rio_mport_create_inbound_mapping(struct mport_dev *md, struct file *filp,
1196 u64 raddr, u64 size,
1197 struct rio_mport_mapping **mapping)
1198 {
1199 struct rio_mport *mport = md->mport;
1200 struct rio_mport_mapping *map;
1201 int ret;
1202
1203 /* rio_map_inb_region() accepts u32 size */
1204 if (size > 0xffffffff)
1205 return -EINVAL;
1206
1207 map = kzalloc(sizeof(*map), GFP_KERNEL);
1208 if (map == NULL)
1209 return -ENOMEM;
1210
1211 map->virt_addr = dma_alloc_coherent(mport->dev.parent, size,
1212 &map->phys_addr, GFP_KERNEL);
1213 if (map->virt_addr == NULL) {
1214 ret = -ENOMEM;
1215 goto err_dma_alloc;
1216 }
1217
1218 if (raddr == RIO_MAP_ANY_ADDR)
1219 raddr = map->phys_addr;
1220 ret = rio_map_inb_region(mport, map->phys_addr, raddr, (u32)size, 0);
1221 if (ret < 0)
1222 goto err_map_inb;
1223
1224 map->dir = MAP_INBOUND;
1225 map->rio_addr = raddr;
1226 map->size = size;
1227 map->filp = filp;
1228 map->md = md;
1229 kref_init(&map->ref);
1230 mutex_lock(&md->buf_mutex);
1231 list_add_tail(&map->node, &md->mappings);
1232 mutex_unlock(&md->buf_mutex);
1233 *mapping = map;
1234 return 0;
1235
1236 err_map_inb:
1237 dma_free_coherent(mport->dev.parent, size,
1238 map->virt_addr, map->phys_addr);
1239 err_dma_alloc:
1240 kfree(map);
1241 return ret;
1242 }
1243
1244 static int
1245 rio_mport_get_inbound_mapping(struct mport_dev *md, struct file *filp,
1246 u64 raddr, u64 size,
1247 struct rio_mport_mapping **mapping)
1248 {
1249 struct rio_mport_mapping *map;
1250 int err = -ENOMEM;
1251
1252 if (raddr == RIO_MAP_ANY_ADDR)
1253 goto get_new;
1254
1255 mutex_lock(&md->buf_mutex);
1256 list_for_each_entry(map, &md->mappings, node) {
1257 if (map->dir != MAP_INBOUND)
1258 continue;
1259 if (raddr == map->rio_addr && size == map->size) {
1260 /* allow exact match only */
1261 *mapping = map;
1262 err = 0;
1263 break;
1264 } else if (raddr < (map->rio_addr + map->size - 1) &&
1265 (raddr + size) > map->rio_addr) {
1266 err = -EBUSY;
1267 break;
1268 }
1269 }
1270 mutex_unlock(&md->buf_mutex);
1271
1272 if (err != -ENOMEM)
1273 return err;
1274 get_new:
1275 /* not found, create new */
1276 return rio_mport_create_inbound_mapping(md, filp, raddr, size, mapping);
1277 }
1278
1279 static int rio_mport_map_inbound(struct file *filp, void __user *arg)
1280 {
1281 struct mport_cdev_priv *priv = filp->private_data;
1282 struct mport_dev *md = priv->md;
1283 struct rio_mmap map;
1284 struct rio_mport_mapping *mapping = NULL;
1285 int ret;
1286
1287 if (!md->mport->ops->map_inb)
1288 return -EPROTONOSUPPORT;
1289 if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1290 return -EFAULT;
1291
1292 rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1293
1294 ret = rio_mport_get_inbound_mapping(md, filp, map.rio_addr,
1295 map.length, &mapping);
1296 if (ret)
1297 return ret;
1298
1299 map.handle = mapping->phys_addr;
1300 map.rio_addr = mapping->rio_addr;
1301
1302 if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1303 /* Delete mapping if it was created by this request */
1304 if (ret == 0 && mapping->filp == filp) {
1305 mutex_lock(&md->buf_mutex);
1306 kref_put(&mapping->ref, mport_release_mapping);
1307 mutex_unlock(&md->buf_mutex);
1308 }
1309 return -EFAULT;
1310 }
1311
1312 return 0;
1313 }
1314
1315 /*
1316 * rio_mport_inbound_free() - unmap from RapidIO address space and free
1317 * previously allocated inbound DMA coherent buffer
1318 * @priv: driver private data
1319 * @arg: buffer handle returned by allocation routine
1320 */
1321 static int rio_mport_inbound_free(struct file *filp, void __user *arg)
1322 {
1323 struct mport_cdev_priv *priv = filp->private_data;
1324 struct mport_dev *md = priv->md;
1325 u64 handle;
1326 struct rio_mport_mapping *map, *_map;
1327
1328 rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1329
1330 if (!md->mport->ops->unmap_inb)
1331 return -EPROTONOSUPPORT;
1332
1333 if (copy_from_user(&handle, arg, sizeof(handle)))
1334 return -EFAULT;
1335
1336 mutex_lock(&md->buf_mutex);
1337 list_for_each_entry_safe(map, _map, &md->mappings, node) {
1338 if (map->dir == MAP_INBOUND && map->phys_addr == handle) {
1339 if (map->filp == filp) {
1340 map->filp = NULL;
1341 kref_put(&map->ref, mport_release_mapping);
1342 }
1343 break;
1344 }
1345 }
1346 mutex_unlock(&md->buf_mutex);
1347
1348 return 0;
1349 }
1350
1351 /*
1352 * maint_port_idx_get() - Get the port index of the mport instance
1353 * @priv: driver private data
1354 * @arg: port index
1355 */
1356 static int maint_port_idx_get(struct mport_cdev_priv *priv, void __user *arg)
1357 {
1358 struct mport_dev *md = priv->md;
1359 u32 port_idx = md->mport->index;
1360
1361 rmcd_debug(MPORT, "port_index=%d", port_idx);
1362
1363 if (copy_to_user(arg, &port_idx, sizeof(port_idx)))
1364 return -EFAULT;
1365
1366 return 0;
1367 }
1368
1369 static int rio_mport_add_event(struct mport_cdev_priv *priv,
1370 struct rio_event *event)
1371 {
1372 int overflow;
1373
1374 if (!(priv->event_mask & event->header))
1375 return -EACCES;
1376
1377 spin_lock(&priv->fifo_lock);
1378 overflow = kfifo_avail(&priv->event_fifo) < sizeof(*event)
1379 || kfifo_in(&priv->event_fifo, (unsigned char *)event,
1380 sizeof(*event)) != sizeof(*event);
1381 spin_unlock(&priv->fifo_lock);
1382
1383 wake_up_interruptible(&priv->event_rx_wait);
1384
1385 if (overflow) {
1386 dev_warn(&priv->md->dev, DRV_NAME ": event fifo overflow\n");
1387 return -EBUSY;
1388 }
1389
1390 return 0;
1391 }
1392
1393 static void rio_mport_doorbell_handler(struct rio_mport *mport, void *dev_id,
1394 u16 src, u16 dst, u16 info)
1395 {
1396 struct mport_dev *data = dev_id;
1397 struct mport_cdev_priv *priv;
1398 struct rio_mport_db_filter *db_filter;
1399 struct rio_event event;
1400 int handled;
1401
1402 event.header = RIO_DOORBELL;
1403 event.u.doorbell.rioid = src;
1404 event.u.doorbell.payload = info;
1405
1406 handled = 0;
1407 spin_lock(&data->db_lock);
1408 list_for_each_entry(db_filter, &data->doorbells, data_node) {
1409 if (((db_filter->filter.rioid == RIO_INVALID_DESTID ||
1410 db_filter->filter.rioid == src)) &&
1411 info >= db_filter->filter.low &&
1412 info <= db_filter->filter.high) {
1413 priv = db_filter->priv;
1414 rio_mport_add_event(priv, &event);
1415 handled = 1;
1416 }
1417 }
1418 spin_unlock(&data->db_lock);
1419
1420 if (!handled)
1421 dev_warn(&data->dev,
1422 "%s: spurious DB received from 0x%x, info=0x%04x\n",
1423 __func__, src, info);
1424 }
1425
1426 static int rio_mport_add_db_filter(struct mport_cdev_priv *priv,
1427 void __user *arg)
1428 {
1429 struct mport_dev *md = priv->md;
1430 struct rio_mport_db_filter *db_filter;
1431 struct rio_doorbell_filter filter;
1432 unsigned long flags;
1433 int ret;
1434
1435 if (copy_from_user(&filter, arg, sizeof(filter)))
1436 return -EFAULT;
1437
1438 if (filter.low > filter.high)
1439 return -EINVAL;
1440
1441 ret = rio_request_inb_dbell(md->mport, md, filter.low, filter.high,
1442 rio_mport_doorbell_handler);
1443 if (ret) {
1444 rmcd_error("%s failed to register IBDB, err=%d",
1445 dev_name(&md->dev), ret);
1446 return ret;
1447 }
1448
1449 db_filter = kzalloc(sizeof(*db_filter), GFP_KERNEL);
1450 if (db_filter == NULL) {
1451 rio_release_inb_dbell(md->mport, filter.low, filter.high);
1452 return -ENOMEM;
1453 }
1454
1455 db_filter->filter = filter;
1456 db_filter->priv = priv;
1457 spin_lock_irqsave(&md->db_lock, flags);
1458 list_add_tail(&db_filter->priv_node, &priv->db_filters);
1459 list_add_tail(&db_filter->data_node, &md->doorbells);
1460 spin_unlock_irqrestore(&md->db_lock, flags);
1461
1462 return 0;
1463 }
1464
1465 static void rio_mport_delete_db_filter(struct rio_mport_db_filter *db_filter)
1466 {
1467 list_del(&db_filter->data_node);
1468 list_del(&db_filter->priv_node);
1469 kfree(db_filter);
1470 }
1471
1472 static int rio_mport_remove_db_filter(struct mport_cdev_priv *priv,
1473 void __user *arg)
1474 {
1475 struct rio_mport_db_filter *db_filter;
1476 struct rio_doorbell_filter filter;
1477 unsigned long flags;
1478 int ret = -EINVAL;
1479
1480 if (copy_from_user(&filter, arg, sizeof(filter)))
1481 return -EFAULT;
1482
1483 if (filter.low > filter.high)
1484 return -EINVAL;
1485
1486 spin_lock_irqsave(&priv->md->db_lock, flags);
1487 list_for_each_entry(db_filter, &priv->db_filters, priv_node) {
1488 if (db_filter->filter.rioid == filter.rioid &&
1489 db_filter->filter.low == filter.low &&
1490 db_filter->filter.high == filter.high) {
1491 rio_mport_delete_db_filter(db_filter);
1492 ret = 0;
1493 break;
1494 }
1495 }
1496 spin_unlock_irqrestore(&priv->md->db_lock, flags);
1497
1498 if (!ret)
1499 rio_release_inb_dbell(priv->md->mport, filter.low, filter.high);
1500
1501 return ret;
1502 }
1503
1504 static int rio_mport_match_pw(union rio_pw_msg *msg,
1505 struct rio_pw_filter *filter)
1506 {
1507 if ((msg->em.comptag & filter->mask) < filter->low ||
1508 (msg->em.comptag & filter->mask) > filter->high)
1509 return 0;
1510 return 1;
1511 }
1512
1513 static int rio_mport_pw_handler(struct rio_mport *mport, void *context,
1514 union rio_pw_msg *msg, int step)
1515 {
1516 struct mport_dev *md = context;
1517 struct mport_cdev_priv *priv;
1518 struct rio_mport_pw_filter *pw_filter;
1519 struct rio_event event;
1520 int handled;
1521
1522 event.header = RIO_PORTWRITE;
1523 memcpy(event.u.portwrite.payload, msg->raw, RIO_PW_MSG_SIZE);
1524
1525 handled = 0;
1526 spin_lock(&md->pw_lock);
1527 list_for_each_entry(pw_filter, &md->portwrites, md_node) {
1528 if (rio_mport_match_pw(msg, &pw_filter->filter)) {
1529 priv = pw_filter->priv;
1530 rio_mport_add_event(priv, &event);
1531 handled = 1;
1532 }
1533 }
1534 spin_unlock(&md->pw_lock);
1535
1536 if (!handled) {
1537 printk_ratelimited(KERN_WARNING DRV_NAME
1538 ": mport%d received spurious PW from 0x%08x\n",
1539 mport->id, msg->em.comptag);
1540 }
1541
1542 return 0;
1543 }
1544
1545 static int rio_mport_add_pw_filter(struct mport_cdev_priv *priv,
1546 void __user *arg)
1547 {
1548 struct mport_dev *md = priv->md;
1549 struct rio_mport_pw_filter *pw_filter;
1550 struct rio_pw_filter filter;
1551 unsigned long flags;
1552 int hadd = 0;
1553
1554 if (copy_from_user(&filter, arg, sizeof(filter)))
1555 return -EFAULT;
1556
1557 pw_filter = kzalloc(sizeof(*pw_filter), GFP_KERNEL);
1558 if (pw_filter == NULL)
1559 return -ENOMEM;
1560
1561 pw_filter->filter = filter;
1562 pw_filter->priv = priv;
1563 spin_lock_irqsave(&md->pw_lock, flags);
1564 if (list_empty(&md->portwrites))
1565 hadd = 1;
1566 list_add_tail(&pw_filter->priv_node, &priv->pw_filters);
1567 list_add_tail(&pw_filter->md_node, &md->portwrites);
1568 spin_unlock_irqrestore(&md->pw_lock, flags);
1569
1570 if (hadd) {
1571 int ret;
1572
1573 ret = rio_add_mport_pw_handler(md->mport, md,
1574 rio_mport_pw_handler);
1575 if (ret) {
1576 dev_err(&md->dev,
1577 "%s: failed to add IB_PW handler, err=%d\n",
1578 __func__, ret);
1579 return ret;
1580 }
1581 rio_pw_enable(md->mport, 1);
1582 }
1583
1584 return 0;
1585 }
1586
1587 static void rio_mport_delete_pw_filter(struct rio_mport_pw_filter *pw_filter)
1588 {
1589 list_del(&pw_filter->md_node);
1590 list_del(&pw_filter->priv_node);
1591 kfree(pw_filter);
1592 }
1593
1594 static int rio_mport_match_pw_filter(struct rio_pw_filter *a,
1595 struct rio_pw_filter *b)
1596 {
1597 if ((a->mask == b->mask) && (a->low == b->low) && (a->high == b->high))
1598 return 1;
1599 return 0;
1600 }
1601
1602 static int rio_mport_remove_pw_filter(struct mport_cdev_priv *priv,
1603 void __user *arg)
1604 {
1605 struct mport_dev *md = priv->md;
1606 struct rio_mport_pw_filter *pw_filter;
1607 struct rio_pw_filter filter;
1608 unsigned long flags;
1609 int ret = -EINVAL;
1610 int hdel = 0;
1611
1612 if (copy_from_user(&filter, arg, sizeof(filter)))
1613 return -EFAULT;
1614
1615 spin_lock_irqsave(&md->pw_lock, flags);
1616 list_for_each_entry(pw_filter, &priv->pw_filters, priv_node) {
1617 if (rio_mport_match_pw_filter(&pw_filter->filter, &filter)) {
1618 rio_mport_delete_pw_filter(pw_filter);
1619 ret = 0;
1620 break;
1621 }
1622 }
1623
1624 if (list_empty(&md->portwrites))
1625 hdel = 1;
1626 spin_unlock_irqrestore(&md->pw_lock, flags);
1627
1628 if (hdel) {
1629 rio_del_mport_pw_handler(md->mport, priv->md,
1630 rio_mport_pw_handler);
1631 rio_pw_enable(md->mport, 0);
1632 }
1633
1634 return ret;
1635 }
1636
1637 /*
1638 * rio_release_dev - release routine for kernel RIO device object
1639 * @dev: kernel device object associated with a RIO device structure
1640 *
1641 * Frees a RIO device struct associated a RIO device struct.
1642 * The RIO device struct is freed.
1643 */
1644 static void rio_release_dev(struct device *dev)
1645 {
1646 struct rio_dev *rdev;
1647
1648 rdev = to_rio_dev(dev);
1649 pr_info(DRV_PREFIX "%s: %s\n", __func__, rio_name(rdev));
1650 kfree(rdev);
1651 }
1652
1653
1654 static void rio_release_net(struct device *dev)
1655 {
1656 struct rio_net *net;
1657
1658 net = to_rio_net(dev);
1659 rmcd_debug(RDEV, "net_%d", net->id);
1660 kfree(net);
1661 }
1662
1663
1664 /*
1665 * rio_mport_add_riodev - creates a kernel RIO device object
1666 *
1667 * Allocates a RIO device data structure and initializes required fields based
1668 * on device's configuration space contents.
1669 * If the device has switch capabilities, then a switch specific portion is
1670 * allocated and configured.
1671 */
1672 static int rio_mport_add_riodev(struct mport_cdev_priv *priv,
1673 void __user *arg)
1674 {
1675 struct mport_dev *md = priv->md;
1676 struct rio_rdev_info dev_info;
1677 struct rio_dev *rdev;
1678 struct rio_switch *rswitch = NULL;
1679 struct rio_mport *mport;
1680 size_t size;
1681 u32 rval;
1682 u32 swpinfo = 0;
1683 u16 destid;
1684 u8 hopcount;
1685 int err;
1686
1687 if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1688 return -EFAULT;
1689 dev_info.name[sizeof(dev_info.name) - 1] = '\0';
1690
1691 rmcd_debug(RDEV, "name:%s ct:0x%x did:0x%x hc:0x%x", dev_info.name,
1692 dev_info.comptag, dev_info.destid, dev_info.hopcount);
1693
1694 if (bus_find_device_by_name(&rio_bus_type, NULL, dev_info.name)) {
1695 rmcd_debug(RDEV, "device %s already exists", dev_info.name);
1696 return -EEXIST;
1697 }
1698
1699 size = sizeof(*rdev);
1700 mport = md->mport;
1701 destid = dev_info.destid;
1702 hopcount = dev_info.hopcount;
1703
1704 if (rio_mport_read_config_32(mport, destid, hopcount,
1705 RIO_PEF_CAR, &rval))
1706 return -EIO;
1707
1708 if (rval & RIO_PEF_SWITCH) {
1709 rio_mport_read_config_32(mport, destid, hopcount,
1710 RIO_SWP_INFO_CAR, &swpinfo);
1711 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
1712 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
1713 }
1714
1715 rdev = kzalloc(size, GFP_KERNEL);
1716 if (rdev == NULL)
1717 return -ENOMEM;
1718
1719 if (mport->net == NULL) {
1720 struct rio_net *net;
1721
1722 net = rio_alloc_net(mport);
1723 if (!net) {
1724 err = -ENOMEM;
1725 rmcd_debug(RDEV, "failed to allocate net object");
1726 goto cleanup;
1727 }
1728
1729 net->id = mport->id;
1730 net->hport = mport;
1731 dev_set_name(&net->dev, "rnet_%d", net->id);
1732 net->dev.parent = &mport->dev;
1733 net->dev.release = rio_release_net;
1734 err = rio_add_net(net);
1735 if (err) {
1736 rmcd_debug(RDEV, "failed to register net, err=%d", err);
1737 kfree(net);
1738 goto cleanup;
1739 }
1740 }
1741
1742 rdev->net = mport->net;
1743 rdev->pef = rval;
1744 rdev->swpinfo = swpinfo;
1745 rio_mport_read_config_32(mport, destid, hopcount,
1746 RIO_DEV_ID_CAR, &rval);
1747 rdev->did = rval >> 16;
1748 rdev->vid = rval & 0xffff;
1749 rio_mport_read_config_32(mport, destid, hopcount, RIO_DEV_INFO_CAR,
1750 &rdev->device_rev);
1751 rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_ID_CAR,
1752 &rval);
1753 rdev->asm_did = rval >> 16;
1754 rdev->asm_vid = rval & 0xffff;
1755 rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_INFO_CAR,
1756 &rval);
1757 rdev->asm_rev = rval >> 16;
1758
1759 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
1760 rdev->efptr = rval & 0xffff;
1761 rdev->phys_efptr = rio_mport_get_physefb(mport, 0, destid,
1762 hopcount, &rdev->phys_rmap);
1763
1764 rdev->em_efptr = rio_mport_get_feature(mport, 0, destid,
1765 hopcount, RIO_EFB_ERR_MGMNT);
1766 }
1767
1768 rio_mport_read_config_32(mport, destid, hopcount, RIO_SRC_OPS_CAR,
1769 &rdev->src_ops);
1770 rio_mport_read_config_32(mport, destid, hopcount, RIO_DST_OPS_CAR,
1771 &rdev->dst_ops);
1772
1773 rdev->comp_tag = dev_info.comptag;
1774 rdev->destid = destid;
1775 /* hopcount is stored as specified by a caller, regardles of EP or SW */
1776 rdev->hopcount = hopcount;
1777
1778 if (rdev->pef & RIO_PEF_SWITCH) {
1779 rswitch = rdev->rswitch;
1780 rswitch->route_table = NULL;
1781 }
1782
1783 if (strlen(dev_info.name))
1784 dev_set_name(&rdev->dev, "%s", dev_info.name);
1785 else if (rdev->pef & RIO_PEF_SWITCH)
1786 dev_set_name(&rdev->dev, "%02x:s:%04x", mport->id,
1787 rdev->comp_tag & RIO_CTAG_UDEVID);
1788 else
1789 dev_set_name(&rdev->dev, "%02x:e:%04x", mport->id,
1790 rdev->comp_tag & RIO_CTAG_UDEVID);
1791
1792 INIT_LIST_HEAD(&rdev->net_list);
1793 rdev->dev.parent = &mport->net->dev;
1794 rio_attach_device(rdev);
1795 rdev->dev.release = rio_release_dev;
1796
1797 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
1798 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
1799 0, 0xffff);
1800 err = rio_add_device(rdev);
1801 if (err)
1802 goto cleanup;
1803 rio_dev_get(rdev);
1804
1805 return 0;
1806 cleanup:
1807 kfree(rdev);
1808 return err;
1809 }
1810
1811 static int rio_mport_del_riodev(struct mport_cdev_priv *priv, void __user *arg)
1812 {
1813 struct rio_rdev_info dev_info;
1814 struct rio_dev *rdev = NULL;
1815 struct device *dev;
1816 struct rio_mport *mport;
1817 struct rio_net *net;
1818
1819 if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1820 return -EFAULT;
1821 dev_info.name[sizeof(dev_info.name) - 1] = '\0';
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);
Linux with added FPC-III support