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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
e8de3701 AB |
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> | |
e8de3701 AB |
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; | |
4e1016da | 125 | u16 rioid; |
e8de3701 AB |
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; | |
4e1016da | 136 | u64 length; |
e8de3701 AB |
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; | |
4e1016da | 207 | u32 event_mask; /* RIO_DOORBELL, RIO_PORTWRITE */ |
e8de3701 AB |
208 | #ifdef CONFIG_RAPIDIO_DMA_ENGINE |
209 | struct dma_chan *dmach; | |
210 | struct list_head async_list; | |
e8de3701 AB |
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 | ||
e8de3701 AB |
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) || | |
4e1016da AB |
272 | (maint_io.length == 0) || (maint_io.length % 4) || |
273 | (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ) | |
e8de3701 AB |
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 | ||
4e1016da AB |
295 | if (unlikely(copy_to_user((void __user *)(uintptr_t)maint_io.buffer, |
296 | buffer, maint_io.length))) | |
e8de3701 AB |
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) || | |
4e1016da AB |
317 | (maint_io.length == 0) || (maint_io.length % 4) || |
318 | (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ) | |
e8de3701 AB |
319 | return -EINVAL; |
320 | ||
321 | buffer = vmalloc(maint_io.length); | |
322 | if (buffer == NULL) | |
323 | return -ENOMEM; | |
324 | length = maint_io.length; | |
325 | ||
4e1016da AB |
326 | if (unlikely(copy_from_user(buffer, |
327 | (void __user *)(uintptr_t)maint_io.buffer, length))) { | |
e8de3701 AB |
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, | |
4e1016da | 360 | u16 rioid, u64 raddr, u32 size, |
e8de3701 AB |
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 | ||
4e1016da | 369 | map = kzalloc(sizeof(*map), GFP_KERNEL); |
e8de3701 AB |
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, | |
4e1016da | 394 | u16 rioid, u64 raddr, u32 size, |
e8de3701 AB |
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 | ||
4e1016da | 433 | if (unlikely(copy_from_user(&map, arg, sizeof(map)))) |
e8de3701 AB |
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 | ||
4e1016da | 448 | if (unlikely(copy_to_user(arg, &map, sizeof(map)))) |
e8de3701 AB |
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 | ||
4e1016da | 469 | if (copy_from_user(&handle, arg, sizeof(handle))) |
e8de3701 AB |
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; | |
4e1016da | 498 | u16 hdid; |
e8de3701 | 499 | |
4e1016da | 500 | if (copy_from_user(&hdid, arg, sizeof(hdid))) |
e8de3701 AB |
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; | |
4e1016da | 520 | u32 comptag; |
e8de3701 | 521 | |
4e1016da | 522 | if (copy_from_user(&comptag, arg, sizeof(comptag))) |
e8de3701 AB |
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 { | |
bbd876ad | 535 | struct kref refcount; |
e8de3701 AB |
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 | ||
e8de3701 AB |
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 | ||
bbd876ad | 570 | static void dma_req_free(struct kref *ref) |
e8de3701 | 571 | { |
bbd876ad IN |
572 | struct mport_dma_req *req = container_of(ref, struct mport_dma_req, |
573 | refcount); | |
e8de3701 | 574 | struct mport_cdev_priv *priv = req->priv; |
e8de3701 AB |
575 | |
576 | dma_unmap_sg(req->dmach->device->dev, | |
577 | req->sgt.sgl, req->sgt.nents, req->dir); | |
578 | sg_free_table(&req->sgt); | |
579 | if (req->page_list) { | |
67446283 | 580 | unpin_user_pages(req->page_list, req->nr_pages); |
e8de3701 AB |
581 | kfree(req->page_list); |
582 | } | |
583 | ||
584 | if (req->map) { | |
585 | mutex_lock(&req->map->md->buf_mutex); | |
586 | kref_put(&req->map->ref, mport_release_mapping); | |
587 | mutex_unlock(&req->map->md->buf_mutex); | |
588 | } | |
589 | ||
590 | kref_put(&priv->dma_ref, mport_release_dma); | |
591 | ||
592 | kfree(req); | |
593 | } | |
594 | ||
595 | static void dma_xfer_callback(void *param) | |
596 | { | |
597 | struct mport_dma_req *req = (struct mport_dma_req *)param; | |
598 | struct mport_cdev_priv *priv = req->priv; | |
599 | ||
600 | req->status = dma_async_is_tx_complete(priv->dmach, req->cookie, | |
601 | NULL, NULL); | |
602 | complete(&req->req_comp); | |
bbd876ad | 603 | kref_put(&req->refcount, dma_req_free); |
e8de3701 AB |
604 | } |
605 | ||
606 | /* | |
607 | * prep_dma_xfer() - Configure and send request to DMAengine to prepare DMA | |
608 | * transfer object. | |
609 | * Returns pointer to DMA transaction descriptor allocated by DMA driver on | |
610 | * success or ERR_PTR (and/or NULL) if failed. Caller must check returned | |
611 | * non-NULL pointer using IS_ERR macro. | |
612 | */ | |
613 | static struct dma_async_tx_descriptor | |
614 | *prep_dma_xfer(struct dma_chan *chan, struct rio_transfer_io *transfer, | |
615 | struct sg_table *sgt, int nents, enum dma_transfer_direction dir, | |
616 | enum dma_ctrl_flags flags) | |
617 | { | |
618 | struct rio_dma_data tx_data; | |
619 | ||
620 | tx_data.sg = sgt->sgl; | |
621 | tx_data.sg_len = nents; | |
622 | tx_data.rio_addr_u = 0; | |
623 | tx_data.rio_addr = transfer->rio_addr; | |
624 | if (dir == DMA_MEM_TO_DEV) { | |
625 | switch (transfer->method) { | |
626 | case RIO_EXCHANGE_NWRITE: | |
627 | tx_data.wr_type = RDW_ALL_NWRITE; | |
628 | break; | |
629 | case RIO_EXCHANGE_NWRITE_R_ALL: | |
630 | tx_data.wr_type = RDW_ALL_NWRITE_R; | |
631 | break; | |
632 | case RIO_EXCHANGE_NWRITE_R: | |
633 | tx_data.wr_type = RDW_LAST_NWRITE_R; | |
634 | break; | |
635 | case RIO_EXCHANGE_DEFAULT: | |
636 | tx_data.wr_type = RDW_DEFAULT; | |
637 | break; | |
638 | default: | |
639 | return ERR_PTR(-EINVAL); | |
640 | } | |
641 | } | |
642 | ||
643 | return rio_dma_prep_xfer(chan, transfer->rioid, &tx_data, dir, flags); | |
644 | } | |
645 | ||
646 | /* Request DMA channel associated with this mport device. | |
647 | * Try to request DMA channel for every new process that opened given | |
648 | * mport. If a new DMA channel is not available use default channel | |
649 | * which is the first DMA channel opened on mport device. | |
650 | */ | |
651 | static int get_dma_channel(struct mport_cdev_priv *priv) | |
652 | { | |
653 | mutex_lock(&priv->dma_lock); | |
654 | if (!priv->dmach) { | |
655 | priv->dmach = rio_request_mport_dma(priv->md->mport); | |
656 | if (!priv->dmach) { | |
657 | /* Use default DMA channel if available */ | |
658 | if (priv->md->dma_chan) { | |
659 | priv->dmach = priv->md->dma_chan; | |
660 | kref_get(&priv->md->dma_ref); | |
661 | } else { | |
662 | rmcd_error("Failed to get DMA channel"); | |
663 | mutex_unlock(&priv->dma_lock); | |
664 | return -ENODEV; | |
665 | } | |
666 | } else if (!priv->md->dma_chan) { | |
667 | /* Register default DMA channel if we do not have one */ | |
668 | priv->md->dma_chan = priv->dmach; | |
669 | kref_init(&priv->md->dma_ref); | |
670 | rmcd_debug(DMA, "Register DMA_chan %d as default", | |
671 | priv->dmach->chan_id); | |
672 | } | |
673 | ||
674 | kref_init(&priv->dma_ref); | |
675 | init_completion(&priv->comp); | |
676 | } | |
677 | ||
678 | kref_get(&priv->dma_ref); | |
679 | mutex_unlock(&priv->dma_lock); | |
680 | return 0; | |
681 | } | |
682 | ||
683 | static void put_dma_channel(struct mport_cdev_priv *priv) | |
684 | { | |
685 | kref_put(&priv->dma_ref, mport_release_dma); | |
686 | } | |
687 | ||
688 | /* | |
689 | * DMA transfer functions | |
690 | */ | |
691 | static int do_dma_request(struct mport_dma_req *req, | |
692 | struct rio_transfer_io *xfer, | |
693 | enum rio_transfer_sync sync, int nents) | |
694 | { | |
695 | struct mport_cdev_priv *priv; | |
696 | struct sg_table *sgt; | |
697 | struct dma_chan *chan; | |
698 | struct dma_async_tx_descriptor *tx; | |
699 | dma_cookie_t cookie; | |
700 | unsigned long tmo = msecs_to_jiffies(dma_timeout); | |
701 | enum dma_transfer_direction dir; | |
702 | long wret; | |
703 | int ret = 0; | |
704 | ||
705 | priv = req->priv; | |
706 | sgt = &req->sgt; | |
707 | ||
708 | chan = priv->dmach; | |
709 | dir = (req->dir == DMA_FROM_DEVICE) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV; | |
710 | ||
711 | rmcd_debug(DMA, "%s(%d) uses %s for DMA_%s", | |
712 | current->comm, task_pid_nr(current), | |
713 | dev_name(&chan->dev->device), | |
714 | (dir == DMA_DEV_TO_MEM)?"READ":"WRITE"); | |
715 | ||
716 | /* Initialize DMA transaction request */ | |
717 | tx = prep_dma_xfer(chan, xfer, sgt, nents, dir, | |
718 | DMA_CTRL_ACK | DMA_PREP_INTERRUPT); | |
719 | ||
720 | if (!tx) { | |
721 | rmcd_debug(DMA, "prep error for %s A:0x%llx L:0x%llx", | |
722 | (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", | |
723 | xfer->rio_addr, xfer->length); | |
724 | ret = -EIO; | |
725 | goto err_out; | |
726 | } else if (IS_ERR(tx)) { | |
727 | ret = PTR_ERR(tx); | |
728 | rmcd_debug(DMA, "prep error %d for %s A:0x%llx L:0x%llx", ret, | |
729 | (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", | |
730 | xfer->rio_addr, xfer->length); | |
731 | goto err_out; | |
732 | } | |
733 | ||
bbd876ad | 734 | tx->callback = dma_xfer_callback; |
e8de3701 AB |
735 | tx->callback_param = req; |
736 | ||
e8de3701 | 737 | req->status = DMA_IN_PROGRESS; |
bbd876ad | 738 | kref_get(&req->refcount); |
e8de3701 AB |
739 | |
740 | cookie = dmaengine_submit(tx); | |
741 | req->cookie = cookie; | |
742 | ||
743 | rmcd_debug(DMA, "pid=%d DMA_%s tx_cookie = %d", task_pid_nr(current), | |
744 | (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie); | |
745 | ||
746 | if (dma_submit_error(cookie)) { | |
747 | rmcd_error("submit err=%d (addr:0x%llx len:0x%llx)", | |
748 | cookie, xfer->rio_addr, xfer->length); | |
bbd876ad | 749 | kref_put(&req->refcount, dma_req_free); |
e8de3701 AB |
750 | ret = -EIO; |
751 | goto err_out; | |
752 | } | |
753 | ||
754 | dma_async_issue_pending(chan); | |
755 | ||
756 | if (sync == RIO_TRANSFER_ASYNC) { | |
757 | spin_lock(&priv->req_lock); | |
758 | list_add_tail(&req->node, &priv->async_list); | |
759 | spin_unlock(&priv->req_lock); | |
760 | return cookie; | |
761 | } else if (sync == RIO_TRANSFER_FAF) | |
762 | return 0; | |
763 | ||
764 | wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo); | |
765 | ||
766 | if (wret == 0) { | |
767 | /* Timeout on wait occurred */ | |
768 | rmcd_error("%s(%d) timed out waiting for DMA_%s %d", | |
769 | current->comm, task_pid_nr(current), | |
770 | (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie); | |
771 | return -ETIMEDOUT; | |
772 | } else if (wret == -ERESTARTSYS) { | |
773 | /* Wait_for_completion was interrupted by a signal but DMA may | |
774 | * be in progress | |
775 | */ | |
776 | rmcd_error("%s(%d) wait for DMA_%s %d was interrupted", | |
777 | current->comm, task_pid_nr(current), | |
778 | (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie); | |
779 | return -EINTR; | |
780 | } | |
781 | ||
782 | if (req->status != DMA_COMPLETE) { | |
783 | /* DMA transaction completion was signaled with error */ | |
784 | rmcd_error("%s(%d) DMA_%s %d completed with status %d (ret=%d)", | |
785 | current->comm, task_pid_nr(current), | |
786 | (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", | |
787 | cookie, req->status, ret); | |
788 | ret = -EIO; | |
789 | } | |
790 | ||
791 | err_out: | |
792 | return ret; | |
793 | } | |
794 | ||
795 | /* | |
796 | * rio_dma_transfer() - Perform RapidIO DMA data transfer to/from | |
797 | * the remote RapidIO device | |
798 | * @filp: file pointer associated with the call | |
799 | * @transfer_mode: DMA transfer mode | |
800 | * @sync: synchronization mode | |
801 | * @dir: DMA transfer direction (DMA_MEM_TO_DEV = write OR | |
802 | * DMA_DEV_TO_MEM = read) | |
803 | * @xfer: data transfer descriptor structure | |
804 | */ | |
805 | static int | |
4e1016da | 806 | rio_dma_transfer(struct file *filp, u32 transfer_mode, |
e8de3701 AB |
807 | enum rio_transfer_sync sync, enum dma_data_direction dir, |
808 | struct rio_transfer_io *xfer) | |
809 | { | |
810 | struct mport_cdev_priv *priv = filp->private_data; | |
811 | unsigned long nr_pages = 0; | |
812 | struct page **page_list = NULL; | |
813 | struct mport_dma_req *req; | |
814 | struct mport_dev *md = priv->md; | |
815 | struct dma_chan *chan; | |
67446283 | 816 | int ret; |
e8de3701 AB |
817 | int nents; |
818 | ||
819 | if (xfer->length == 0) | |
820 | return -EINVAL; | |
821 | req = kzalloc(sizeof(*req), GFP_KERNEL); | |
822 | if (!req) | |
823 | return -ENOMEM; | |
824 | ||
825 | ret = get_dma_channel(priv); | |
826 | if (ret) { | |
827 | kfree(req); | |
828 | return ret; | |
829 | } | |
c5157b76 IN |
830 | chan = priv->dmach; |
831 | ||
832 | kref_init(&req->refcount); | |
833 | init_completion(&req->req_comp); | |
834 | req->dir = dir; | |
835 | req->filp = filp; | |
836 | req->priv = priv; | |
837 | req->dmach = chan; | |
838 | req->sync = sync; | |
e8de3701 AB |
839 | |
840 | /* | |
841 | * If parameter loc_addr != NULL, we are transferring data from/to | |
842 | * data buffer allocated in user-space: lock in memory user-space | |
843 | * buffer pages and build an SG table for DMA transfer request | |
844 | * | |
845 | * Otherwise (loc_addr == NULL) contiguous kernel-space buffer is | |
846 | * used for DMA data transfers: build single entry SG table using | |
847 | * offset within the internal buffer specified by handle parameter. | |
848 | */ | |
849 | if (xfer->loc_addr) { | |
c4860ad6 | 850 | unsigned int offset; |
e8de3701 AB |
851 | long pinned; |
852 | ||
c4860ad6 | 853 | offset = lower_32_bits(offset_in_page(xfer->loc_addr)); |
e8de3701 AB |
854 | nr_pages = PAGE_ALIGN(xfer->length + offset) >> PAGE_SHIFT; |
855 | ||
856 | page_list = kmalloc_array(nr_pages, | |
857 | sizeof(*page_list), GFP_KERNEL); | |
858 | if (page_list == NULL) { | |
859 | ret = -ENOMEM; | |
860 | goto err_req; | |
861 | } | |
862 | ||
67446283 | 863 | pinned = pin_user_pages_fast( |
e8de3701 | 864 | (unsigned long)xfer->loc_addr & PAGE_MASK, |
73b0140b IW |
865 | nr_pages, |
866 | dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0, | |
867 | page_list); | |
e8de3701 AB |
868 | |
869 | if (pinned != nr_pages) { | |
870 | if (pinned < 0) { | |
67446283 | 871 | rmcd_error("pin_user_pages_fast err=%ld", |
369f2679 | 872 | pinned); |
e8de3701 | 873 | nr_pages = 0; |
fa63f083 | 874 | } else { |
e8de3701 AB |
875 | rmcd_error("pinned %ld out of %ld pages", |
876 | pinned, nr_pages); | |
fa63f083 SJ |
877 | /* |
878 | * Set nr_pages up to mean "how many pages to unpin, in | |
879 | * the error handler: | |
880 | */ | |
881 | nr_pages = pinned; | |
882 | } | |
e8de3701 AB |
883 | ret = -EFAULT; |
884 | goto err_pg; | |
885 | } | |
886 | ||
887 | ret = sg_alloc_table_from_pages(&req->sgt, page_list, nr_pages, | |
888 | offset, xfer->length, GFP_KERNEL); | |
889 | if (ret) { | |
890 | rmcd_error("sg_alloc_table failed with err=%d", ret); | |
891 | goto err_pg; | |
892 | } | |
893 | ||
894 | req->page_list = page_list; | |
895 | req->nr_pages = nr_pages; | |
896 | } else { | |
897 | dma_addr_t baddr; | |
898 | struct rio_mport_mapping *map; | |
899 | ||
900 | baddr = (dma_addr_t)xfer->handle; | |
901 | ||
902 | mutex_lock(&md->buf_mutex); | |
903 | list_for_each_entry(map, &md->mappings, node) { | |
904 | if (baddr >= map->phys_addr && | |
905 | baddr < (map->phys_addr + map->size)) { | |
906 | kref_get(&map->ref); | |
907 | req->map = map; | |
908 | break; | |
909 | } | |
910 | } | |
911 | mutex_unlock(&md->buf_mutex); | |
912 | ||
913 | if (req->map == NULL) { | |
914 | ret = -ENOMEM; | |
915 | goto err_req; | |
916 | } | |
917 | ||
918 | if (xfer->length + xfer->offset > map->size) { | |
919 | ret = -EINVAL; | |
920 | goto err_req; | |
921 | } | |
922 | ||
923 | ret = sg_alloc_table(&req->sgt, 1, GFP_KERNEL); | |
924 | if (unlikely(ret)) { | |
925 | rmcd_error("sg_alloc_table failed for internal buf"); | |
926 | goto err_req; | |
927 | } | |
928 | ||
929 | sg_set_buf(req->sgt.sgl, | |
930 | map->virt_addr + (baddr - map->phys_addr) + | |
931 | xfer->offset, xfer->length); | |
932 | } | |
933 | ||
e8de3701 AB |
934 | nents = dma_map_sg(chan->device->dev, |
935 | req->sgt.sgl, req->sgt.nents, dir); | |
c46d90cd | 936 | if (nents == 0) { |
e8de3701 | 937 | rmcd_error("Failed to map SG list"); |
b1402dcb CJ |
938 | ret = -EFAULT; |
939 | goto err_pg; | |
e8de3701 AB |
940 | } |
941 | ||
942 | ret = do_dma_request(req, xfer, sync, nents); | |
943 | ||
944 | if (ret >= 0) { | |
bbd876ad IN |
945 | if (sync == RIO_TRANSFER_ASYNC) |
946 | return ret; /* return ASYNC cookie */ | |
947 | } else { | |
948 | rmcd_debug(DMA, "do_dma_request failed with err=%d", ret); | |
e8de3701 AB |
949 | } |
950 | ||
e8de3701 | 951 | err_pg: |
bbd876ad | 952 | if (!req->page_list) { |
67446283 | 953 | unpin_user_pages(page_list, nr_pages); |
e8de3701 AB |
954 | kfree(page_list); |
955 | } | |
956 | err_req: | |
bbd876ad | 957 | kref_put(&req->refcount, dma_req_free); |
e8de3701 AB |
958 | return ret; |
959 | } | |
960 | ||
961 | static int rio_mport_transfer_ioctl(struct file *filp, void __user *arg) | |
962 | { | |
963 | struct mport_cdev_priv *priv = filp->private_data; | |
964 | struct rio_transaction transaction; | |
965 | struct rio_transfer_io *transfer; | |
966 | enum dma_data_direction dir; | |
967 | int i, ret = 0; | |
968 | ||
969 | if (unlikely(copy_from_user(&transaction, arg, sizeof(transaction)))) | |
970 | return -EFAULT; | |
971 | ||
4e1016da | 972 | if (transaction.count != 1) /* only single transfer for now */ |
e8de3701 AB |
973 | return -EINVAL; |
974 | ||
975 | if ((transaction.transfer_mode & | |
976 | priv->md->properties.transfer_mode) == 0) | |
977 | return -ENODEV; | |
978 | ||
42bc47b3 | 979 | transfer = vmalloc(array_size(sizeof(*transfer), transaction.count)); |
e8de3701 AB |
980 | if (!transfer) |
981 | return -ENOMEM; | |
982 | ||
4e1016da AB |
983 | if (unlikely(copy_from_user(transfer, |
984 | (void __user *)(uintptr_t)transaction.block, | |
d7137549 | 985 | array_size(sizeof(*transfer), transaction.count)))) { |
e8de3701 AB |
986 | ret = -EFAULT; |
987 | goto out_free; | |
988 | } | |
989 | ||
990 | dir = (transaction.dir == RIO_TRANSFER_DIR_READ) ? | |
991 | DMA_FROM_DEVICE : DMA_TO_DEVICE; | |
992 | for (i = 0; i < transaction.count && ret == 0; i++) | |
993 | ret = rio_dma_transfer(filp, transaction.transfer_mode, | |
994 | transaction.sync, dir, &transfer[i]); | |
995 | ||
4e1016da AB |
996 | if (unlikely(copy_to_user((void __user *)(uintptr_t)transaction.block, |
997 | transfer, | |
d7137549 | 998 | array_size(sizeof(*transfer), transaction.count)))) |
e8de3701 AB |
999 | ret = -EFAULT; |
1000 | ||
1001 | out_free: | |
1002 | vfree(transfer); | |
1003 | ||
1004 | return ret; | |
1005 | } | |
1006 | ||
1007 | static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg) | |
1008 | { | |
1009 | struct mport_cdev_priv *priv; | |
e8de3701 AB |
1010 | struct rio_async_tx_wait w_param; |
1011 | struct mport_dma_req *req; | |
1012 | dma_cookie_t cookie; | |
1013 | unsigned long tmo; | |
1014 | long wret; | |
1015 | int found = 0; | |
1016 | int ret; | |
1017 | ||
1018 | priv = (struct mport_cdev_priv *)filp->private_data; | |
e8de3701 AB |
1019 | |
1020 | if (unlikely(copy_from_user(&w_param, arg, sizeof(w_param)))) | |
1021 | return -EFAULT; | |
1022 | ||
1023 | cookie = w_param.token; | |
1024 | if (w_param.timeout) | |
1025 | tmo = msecs_to_jiffies(w_param.timeout); | |
1026 | else /* Use default DMA timeout */ | |
1027 | tmo = msecs_to_jiffies(dma_timeout); | |
1028 | ||
1029 | spin_lock(&priv->req_lock); | |
1030 | list_for_each_entry(req, &priv->async_list, node) { | |
1031 | if (req->cookie == cookie) { | |
1032 | list_del(&req->node); | |
1033 | found = 1; | |
1034 | break; | |
1035 | } | |
1036 | } | |
1037 | spin_unlock(&priv->req_lock); | |
1038 | ||
1039 | if (!found) | |
1040 | return -EAGAIN; | |
1041 | ||
1042 | wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo); | |
1043 | ||
1044 | if (wret == 0) { | |
1045 | /* Timeout on wait occurred */ | |
1046 | rmcd_error("%s(%d) timed out waiting for ASYNC DMA_%s", | |
1047 | current->comm, task_pid_nr(current), | |
1048 | (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE"); | |
1049 | ret = -ETIMEDOUT; | |
1050 | goto err_tmo; | |
1051 | } else if (wret == -ERESTARTSYS) { | |
1052 | /* Wait_for_completion was interrupted by a signal but DMA may | |
1053 | * be still in progress | |
1054 | */ | |
1055 | rmcd_error("%s(%d) wait for ASYNC DMA_%s was interrupted", | |
1056 | current->comm, task_pid_nr(current), | |
1057 | (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE"); | |
1058 | ret = -EINTR; | |
1059 | goto err_tmo; | |
1060 | } | |
1061 | ||
1062 | if (req->status != DMA_COMPLETE) { | |
1063 | /* DMA transaction completion signaled with transfer error */ | |
1064 | rmcd_error("%s(%d) ASYNC DMA_%s completion with status %d", | |
1065 | current->comm, task_pid_nr(current), | |
1066 | (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE", | |
1067 | req->status); | |
1068 | ret = -EIO; | |
1069 | } else | |
1070 | ret = 0; | |
1071 | ||
1072 | if (req->status != DMA_IN_PROGRESS && req->status != DMA_PAUSED) | |
bbd876ad | 1073 | kref_put(&req->refcount, dma_req_free); |
e8de3701 AB |
1074 | |
1075 | return ret; | |
1076 | ||
1077 | err_tmo: | |
1078 | /* Return request back into async queue */ | |
1079 | spin_lock(&priv->req_lock); | |
1080 | list_add_tail(&req->node, &priv->async_list); | |
1081 | spin_unlock(&priv->req_lock); | |
1082 | return ret; | |
1083 | } | |
1084 | ||
1085 | static int rio_mport_create_dma_mapping(struct mport_dev *md, struct file *filp, | |
4e1016da | 1086 | u64 size, struct rio_mport_mapping **mapping) |
e8de3701 AB |
1087 | { |
1088 | struct rio_mport_mapping *map; | |
1089 | ||
4e1016da | 1090 | map = kzalloc(sizeof(*map), GFP_KERNEL); |
e8de3701 AB |
1091 | if (map == NULL) |
1092 | return -ENOMEM; | |
1093 | ||
1094 | map->virt_addr = dma_alloc_coherent(md->mport->dev.parent, size, | |
1095 | &map->phys_addr, GFP_KERNEL); | |
1096 | if (map->virt_addr == NULL) { | |
1097 | kfree(map); | |
1098 | return -ENOMEM; | |
1099 | } | |
1100 | ||
1101 | map->dir = MAP_DMA; | |
1102 | map->size = size; | |
1103 | map->filp = filp; | |
1104 | map->md = md; | |
1105 | kref_init(&map->ref); | |
1106 | mutex_lock(&md->buf_mutex); | |
1107 | list_add_tail(&map->node, &md->mappings); | |
1108 | mutex_unlock(&md->buf_mutex); | |
1109 | *mapping = map; | |
1110 | ||
1111 | return 0; | |
1112 | } | |
1113 | ||
1114 | static int rio_mport_alloc_dma(struct file *filp, void __user *arg) | |
1115 | { | |
1116 | struct mport_cdev_priv *priv = filp->private_data; | |
1117 | struct mport_dev *md = priv->md; | |
1118 | struct rio_dma_mem map; | |
1119 | struct rio_mport_mapping *mapping = NULL; | |
1120 | int ret; | |
1121 | ||
4e1016da | 1122 | if (unlikely(copy_from_user(&map, arg, sizeof(map)))) |
e8de3701 AB |
1123 | return -EFAULT; |
1124 | ||
1125 | ret = rio_mport_create_dma_mapping(md, filp, map.length, &mapping); | |
1126 | if (ret) | |
1127 | return ret; | |
1128 | ||
1129 | map.dma_handle = mapping->phys_addr; | |
1130 | ||
4e1016da | 1131 | if (unlikely(copy_to_user(arg, &map, sizeof(map)))) { |
e8de3701 AB |
1132 | mutex_lock(&md->buf_mutex); |
1133 | kref_put(&mapping->ref, mport_release_mapping); | |
1134 | mutex_unlock(&md->buf_mutex); | |
1135 | return -EFAULT; | |
1136 | } | |
1137 | ||
1138 | return 0; | |
1139 | } | |
1140 | ||
1141 | static int rio_mport_free_dma(struct file *filp, void __user *arg) | |
1142 | { | |
1143 | struct mport_cdev_priv *priv = filp->private_data; | |
1144 | struct mport_dev *md = priv->md; | |
1145 | u64 handle; | |
1146 | int ret = -EFAULT; | |
1147 | struct rio_mport_mapping *map, *_map; | |
1148 | ||
4e1016da | 1149 | if (copy_from_user(&handle, arg, sizeof(handle))) |
e8de3701 AB |
1150 | return -EFAULT; |
1151 | rmcd_debug(EXIT, "filp=%p", filp); | |
1152 | ||
1153 | mutex_lock(&md->buf_mutex); | |
1154 | list_for_each_entry_safe(map, _map, &md->mappings, node) { | |
1155 | if (map->dir == MAP_DMA && map->phys_addr == handle && | |
1156 | map->filp == filp) { | |
1157 | kref_put(&map->ref, mport_release_mapping); | |
1158 | ret = 0; | |
1159 | break; | |
1160 | } | |
1161 | } | |
1162 | mutex_unlock(&md->buf_mutex); | |
1163 | ||
1164 | if (ret == -EFAULT) { | |
1165 | rmcd_debug(DMA, "ERR no matching mapping"); | |
1166 | return ret; | |
1167 | } | |
1168 | ||
1169 | return 0; | |
1170 | } | |
1171 | #else | |
1172 | static int rio_mport_transfer_ioctl(struct file *filp, void *arg) | |
1173 | { | |
1174 | return -ENODEV; | |
1175 | } | |
1176 | ||
1177 | static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg) | |
1178 | { | |
1179 | return -ENODEV; | |
1180 | } | |
1181 | ||
1182 | static int rio_mport_alloc_dma(struct file *filp, void __user *arg) | |
1183 | { | |
1184 | return -ENODEV; | |
1185 | } | |
1186 | ||
1187 | static int rio_mport_free_dma(struct file *filp, void __user *arg) | |
1188 | { | |
1189 | return -ENODEV; | |
1190 | } | |
1191 | #endif /* CONFIG_RAPIDIO_DMA_ENGINE */ | |
1192 | ||
1193 | /* | |
1194 | * Inbound/outbound memory mapping functions | |
1195 | */ | |
1196 | ||
1197 | static int | |
1198 | rio_mport_create_inbound_mapping(struct mport_dev *md, struct file *filp, | |
4e1016da | 1199 | u64 raddr, u64 size, |
e8de3701 AB |
1200 | struct rio_mport_mapping **mapping) |
1201 | { | |
1202 | struct rio_mport *mport = md->mport; | |
1203 | struct rio_mport_mapping *map; | |
1204 | int ret; | |
1205 | ||
4e1016da AB |
1206 | /* rio_map_inb_region() accepts u32 size */ |
1207 | if (size > 0xffffffff) | |
1208 | return -EINVAL; | |
1209 | ||
1210 | map = kzalloc(sizeof(*map), GFP_KERNEL); | |
e8de3701 AB |
1211 | if (map == NULL) |
1212 | return -ENOMEM; | |
1213 | ||
1214 | map->virt_addr = dma_alloc_coherent(mport->dev.parent, size, | |
1215 | &map->phys_addr, GFP_KERNEL); | |
1216 | if (map->virt_addr == NULL) { | |
1217 | ret = -ENOMEM; | |
1218 | goto err_dma_alloc; | |
1219 | } | |
1220 | ||
1221 | if (raddr == RIO_MAP_ANY_ADDR) | |
1222 | raddr = map->phys_addr; | |
4e1016da | 1223 | ret = rio_map_inb_region(mport, map->phys_addr, raddr, (u32)size, 0); |
e8de3701 AB |
1224 | if (ret < 0) |
1225 | goto err_map_inb; | |
1226 | ||
1227 | map->dir = MAP_INBOUND; | |
1228 | map->rio_addr = raddr; | |
1229 | map->size = size; | |
1230 | map->filp = filp; | |
1231 | map->md = md; | |
1232 | kref_init(&map->ref); | |
1233 | mutex_lock(&md->buf_mutex); | |
1234 | list_add_tail(&map->node, &md->mappings); | |
1235 | mutex_unlock(&md->buf_mutex); | |
1236 | *mapping = map; | |
1237 | return 0; | |
1238 | ||
1239 | err_map_inb: | |
1240 | dma_free_coherent(mport->dev.parent, size, | |
1241 | map->virt_addr, map->phys_addr); | |
1242 | err_dma_alloc: | |
1243 | kfree(map); | |
1244 | return ret; | |
1245 | } | |
1246 | ||
1247 | static int | |
1248 | rio_mport_get_inbound_mapping(struct mport_dev *md, struct file *filp, | |
4e1016da | 1249 | u64 raddr, u64 size, |
e8de3701 AB |
1250 | struct rio_mport_mapping **mapping) |
1251 | { | |
1252 | struct rio_mport_mapping *map; | |
1253 | int err = -ENOMEM; | |
1254 | ||
1255 | if (raddr == RIO_MAP_ANY_ADDR) | |
1256 | goto get_new; | |
1257 | ||
1258 | mutex_lock(&md->buf_mutex); | |
1259 | list_for_each_entry(map, &md->mappings, node) { | |
1260 | if (map->dir != MAP_INBOUND) | |
1261 | continue; | |
1262 | if (raddr == map->rio_addr && size == map->size) { | |
1263 | /* allow exact match only */ | |
1264 | *mapping = map; | |
1265 | err = 0; | |
1266 | break; | |
1267 | } else if (raddr < (map->rio_addr + map->size - 1) && | |
1268 | (raddr + size) > map->rio_addr) { | |
1269 | err = -EBUSY; | |
1270 | break; | |
1271 | } | |
1272 | } | |
1273 | mutex_unlock(&md->buf_mutex); | |
1274 | ||
1275 | if (err != -ENOMEM) | |
1276 | return err; | |
1277 | get_new: | |
1278 | /* not found, create new */ | |
1279 | return rio_mport_create_inbound_mapping(md, filp, raddr, size, mapping); | |
1280 | } | |
1281 | ||
1282 | static int rio_mport_map_inbound(struct file *filp, void __user *arg) | |
1283 | { | |
1284 | struct mport_cdev_priv *priv = filp->private_data; | |
1285 | struct mport_dev *md = priv->md; | |
1286 | struct rio_mmap map; | |
1287 | struct rio_mport_mapping *mapping = NULL; | |
1288 | int ret; | |
1289 | ||
1290 | if (!md->mport->ops->map_inb) | |
1291 | return -EPROTONOSUPPORT; | |
4e1016da | 1292 | if (unlikely(copy_from_user(&map, arg, sizeof(map)))) |
e8de3701 AB |
1293 | return -EFAULT; |
1294 | ||
1295 | rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp); | |
1296 | ||
1297 | ret = rio_mport_get_inbound_mapping(md, filp, map.rio_addr, | |
1298 | map.length, &mapping); | |
1299 | if (ret) | |
1300 | return ret; | |
1301 | ||
1302 | map.handle = mapping->phys_addr; | |
1303 | map.rio_addr = mapping->rio_addr; | |
1304 | ||
4e1016da | 1305 | if (unlikely(copy_to_user(arg, &map, sizeof(map)))) { |
e8de3701 AB |
1306 | /* Delete mapping if it was created by this request */ |
1307 | if (ret == 0 && mapping->filp == filp) { | |
1308 | mutex_lock(&md->buf_mutex); | |
1309 | kref_put(&mapping->ref, mport_release_mapping); | |
1310 | mutex_unlock(&md->buf_mutex); | |
1311 | } | |
1312 | return -EFAULT; | |
1313 | } | |
1314 | ||
1315 | return 0; | |
1316 | } | |
1317 | ||
1318 | /* | |
1319 | * rio_mport_inbound_free() - unmap from RapidIO address space and free | |
1320 | * previously allocated inbound DMA coherent buffer | |
1321 | * @priv: driver private data | |
1322 | * @arg: buffer handle returned by allocation routine | |
1323 | */ | |
1324 | static int rio_mport_inbound_free(struct file *filp, void __user *arg) | |
1325 | { | |
1326 | struct mport_cdev_priv *priv = filp->private_data; | |
1327 | struct mport_dev *md = priv->md; | |
1328 | u64 handle; | |
1329 | struct rio_mport_mapping *map, *_map; | |
1330 | ||
1331 | rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp); | |
1332 | ||
1333 | if (!md->mport->ops->unmap_inb) | |
1334 | return -EPROTONOSUPPORT; | |
1335 | ||
4e1016da | 1336 | if (copy_from_user(&handle, arg, sizeof(handle))) |
e8de3701 AB |
1337 | return -EFAULT; |
1338 | ||
1339 | mutex_lock(&md->buf_mutex); | |
1340 | list_for_each_entry_safe(map, _map, &md->mappings, node) { | |
1341 | if (map->dir == MAP_INBOUND && map->phys_addr == handle) { | |
1342 | if (map->filp == filp) { | |
1343 | map->filp = NULL; | |
1344 | kref_put(&map->ref, mport_release_mapping); | |
1345 | } | |
1346 | break; | |
1347 | } | |
1348 | } | |
1349 | mutex_unlock(&md->buf_mutex); | |
1350 | ||
1351 | return 0; | |
1352 | } | |
1353 | ||
1354 | /* | |
1355 | * maint_port_idx_get() - Get the port index of the mport instance | |
1356 | * @priv: driver private data | |
1357 | * @arg: port index | |
1358 | */ | |
1359 | static int maint_port_idx_get(struct mport_cdev_priv *priv, void __user *arg) | |
1360 | { | |
1361 | struct mport_dev *md = priv->md; | |
4e1016da | 1362 | u32 port_idx = md->mport->index; |
e8de3701 AB |
1363 | |
1364 | rmcd_debug(MPORT, "port_index=%d", port_idx); | |
1365 | ||
1366 | if (copy_to_user(arg, &port_idx, sizeof(port_idx))) | |
1367 | return -EFAULT; | |
1368 | ||
1369 | return 0; | |
1370 | } | |
1371 | ||
1372 | static int rio_mport_add_event(struct mport_cdev_priv *priv, | |
1373 | struct rio_event *event) | |
1374 | { | |
1375 | int overflow; | |
1376 | ||
1377 | if (!(priv->event_mask & event->header)) | |
1378 | return -EACCES; | |
1379 | ||
1380 | spin_lock(&priv->fifo_lock); | |
1381 | overflow = kfifo_avail(&priv->event_fifo) < sizeof(*event) | |
1382 | || kfifo_in(&priv->event_fifo, (unsigned char *)event, | |
1383 | sizeof(*event)) != sizeof(*event); | |
1384 | spin_unlock(&priv->fifo_lock); | |
1385 | ||
1386 | wake_up_interruptible(&priv->event_rx_wait); | |
1387 | ||
1388 | if (overflow) { | |
1389 | dev_warn(&priv->md->dev, DRV_NAME ": event fifo overflow\n"); | |
1390 | return -EBUSY; | |
1391 | } | |
1392 | ||
1393 | return 0; | |
1394 | } | |
1395 | ||
1396 | static void rio_mport_doorbell_handler(struct rio_mport *mport, void *dev_id, | |
1397 | u16 src, u16 dst, u16 info) | |
1398 | { | |
1399 | struct mport_dev *data = dev_id; | |
1400 | struct mport_cdev_priv *priv; | |
1401 | struct rio_mport_db_filter *db_filter; | |
1402 | struct rio_event event; | |
1403 | int handled; | |
1404 | ||
1405 | event.header = RIO_DOORBELL; | |
1406 | event.u.doorbell.rioid = src; | |
1407 | event.u.doorbell.payload = info; | |
1408 | ||
1409 | handled = 0; | |
1410 | spin_lock(&data->db_lock); | |
1411 | list_for_each_entry(db_filter, &data->doorbells, data_node) { | |
4e1016da | 1412 | if (((db_filter->filter.rioid == RIO_INVALID_DESTID || |
e8de3701 AB |
1413 | db_filter->filter.rioid == src)) && |
1414 | info >= db_filter->filter.low && | |
1415 | info <= db_filter->filter.high) { | |
1416 | priv = db_filter->priv; | |
1417 | rio_mport_add_event(priv, &event); | |
1418 | handled = 1; | |
1419 | } | |
1420 | } | |
1421 | spin_unlock(&data->db_lock); | |
1422 | ||
1423 | if (!handled) | |
1424 | dev_warn(&data->dev, | |
1425 | "%s: spurious DB received from 0x%x, info=0x%04x\n", | |
1426 | __func__, src, info); | |
1427 | } | |
1428 | ||
1429 | static int rio_mport_add_db_filter(struct mport_cdev_priv *priv, | |
1430 | void __user *arg) | |
1431 | { | |
1432 | struct mport_dev *md = priv->md; | |
1433 | struct rio_mport_db_filter *db_filter; | |
1434 | struct rio_doorbell_filter filter; | |
1435 | unsigned long flags; | |
1436 | int ret; | |
1437 | ||
1438 | if (copy_from_user(&filter, arg, sizeof(filter))) | |
1439 | return -EFAULT; | |
1440 | ||
1441 | if (filter.low > filter.high) | |
1442 | return -EINVAL; | |
1443 | ||
1444 | ret = rio_request_inb_dbell(md->mport, md, filter.low, filter.high, | |
1445 | rio_mport_doorbell_handler); | |
1446 | if (ret) { | |
1447 | rmcd_error("%s failed to register IBDB, err=%d", | |
1448 | dev_name(&md->dev), ret); | |
1449 | return ret; | |
1450 | } | |
1451 | ||
1452 | db_filter = kzalloc(sizeof(*db_filter), GFP_KERNEL); | |
1453 | if (db_filter == NULL) { | |
1454 | rio_release_inb_dbell(md->mport, filter.low, filter.high); | |
1455 | return -ENOMEM; | |
1456 | } | |
1457 | ||
1458 | db_filter->filter = filter; | |
1459 | db_filter->priv = priv; | |
1460 | spin_lock_irqsave(&md->db_lock, flags); | |
1461 | list_add_tail(&db_filter->priv_node, &priv->db_filters); | |
1462 | list_add_tail(&db_filter->data_node, &md->doorbells); | |
1463 | spin_unlock_irqrestore(&md->db_lock, flags); | |
1464 | ||
1465 | return 0; | |
1466 | } | |
1467 | ||
1468 | static void rio_mport_delete_db_filter(struct rio_mport_db_filter *db_filter) | |
1469 | { | |
1470 | list_del(&db_filter->data_node); | |
1471 | list_del(&db_filter->priv_node); | |
1472 | kfree(db_filter); | |
1473 | } | |
1474 | ||
1475 | static int rio_mport_remove_db_filter(struct mport_cdev_priv *priv, | |
1476 | void __user *arg) | |
1477 | { | |
1478 | struct rio_mport_db_filter *db_filter; | |
1479 | struct rio_doorbell_filter filter; | |
1480 | unsigned long flags; | |
1481 | int ret = -EINVAL; | |
1482 | ||
1483 | if (copy_from_user(&filter, arg, sizeof(filter))) | |
1484 | return -EFAULT; | |
1485 | ||
4e1016da AB |
1486 | if (filter.low > filter.high) |
1487 | return -EINVAL; | |
1488 | ||
e8de3701 AB |
1489 | spin_lock_irqsave(&priv->md->db_lock, flags); |
1490 | list_for_each_entry(db_filter, &priv->db_filters, priv_node) { | |
1491 | if (db_filter->filter.rioid == filter.rioid && | |
1492 | db_filter->filter.low == filter.low && | |
1493 | db_filter->filter.high == filter.high) { | |
1494 | rio_mport_delete_db_filter(db_filter); | |
1495 | ret = 0; | |
1496 | break; | |
1497 | } | |
1498 | } | |
1499 | spin_unlock_irqrestore(&priv->md->db_lock, flags); | |
1500 | ||
1501 | if (!ret) | |
1502 | rio_release_inb_dbell(priv->md->mport, filter.low, filter.high); | |
1503 | ||
1504 | return ret; | |
1505 | } | |
1506 | ||
1507 | static int rio_mport_match_pw(union rio_pw_msg *msg, | |
1508 | struct rio_pw_filter *filter) | |
1509 | { | |
1510 | if ((msg->em.comptag & filter->mask) < filter->low || | |
1511 | (msg->em.comptag & filter->mask) > filter->high) | |
1512 | return 0; | |
1513 | return 1; | |
1514 | } | |
1515 | ||
1516 | static int rio_mport_pw_handler(struct rio_mport *mport, void *context, | |
1517 | union rio_pw_msg *msg, int step) | |
1518 | { | |
1519 | struct mport_dev *md = context; | |
1520 | struct mport_cdev_priv *priv; | |
1521 | struct rio_mport_pw_filter *pw_filter; | |
1522 | struct rio_event event; | |
1523 | int handled; | |
1524 | ||
1525 | event.header = RIO_PORTWRITE; | |
1526 | memcpy(event.u.portwrite.payload, msg->raw, RIO_PW_MSG_SIZE); | |
1527 | ||
1528 | handled = 0; | |
1529 | spin_lock(&md->pw_lock); | |
1530 | list_for_each_entry(pw_filter, &md->portwrites, md_node) { | |
1531 | if (rio_mport_match_pw(msg, &pw_filter->filter)) { | |
1532 | priv = pw_filter->priv; | |
1533 | rio_mport_add_event(priv, &event); | |
1534 | handled = 1; | |
1535 | } | |
1536 | } | |
1537 | spin_unlock(&md->pw_lock); | |
1538 | ||
1539 | if (!handled) { | |
1540 | printk_ratelimited(KERN_WARNING DRV_NAME | |
1541 | ": mport%d received spurious PW from 0x%08x\n", | |
1542 | mport->id, msg->em.comptag); | |
1543 | } | |
1544 | ||
1545 | return 0; | |
1546 | } | |
1547 | ||
1548 | static int rio_mport_add_pw_filter(struct mport_cdev_priv *priv, | |
1549 | void __user *arg) | |
1550 | { | |
1551 | struct mport_dev *md = priv->md; | |
1552 | struct rio_mport_pw_filter *pw_filter; | |
1553 | struct rio_pw_filter filter; | |
1554 | unsigned long flags; | |
1555 | int hadd = 0; | |
1556 | ||
1557 | if (copy_from_user(&filter, arg, sizeof(filter))) | |
1558 | return -EFAULT; | |
1559 | ||
1560 | pw_filter = kzalloc(sizeof(*pw_filter), GFP_KERNEL); | |
1561 | if (pw_filter == NULL) | |
1562 | return -ENOMEM; | |
1563 | ||
1564 | pw_filter->filter = filter; | |
1565 | pw_filter->priv = priv; | |
1566 | spin_lock_irqsave(&md->pw_lock, flags); | |
1567 | if (list_empty(&md->portwrites)) | |
1568 | hadd = 1; | |
1569 | list_add_tail(&pw_filter->priv_node, &priv->pw_filters); | |
1570 | list_add_tail(&pw_filter->md_node, &md->portwrites); | |
1571 | spin_unlock_irqrestore(&md->pw_lock, flags); | |
1572 | ||
1573 | if (hadd) { | |
1574 | int ret; | |
1575 | ||
1576 | ret = rio_add_mport_pw_handler(md->mport, md, | |
1577 | rio_mport_pw_handler); | |
1578 | if (ret) { | |
1579 | dev_err(&md->dev, | |
1580 | "%s: failed to add IB_PW handler, err=%d\n", | |
1581 | __func__, ret); | |
1582 | return ret; | |
1583 | } | |
1584 | rio_pw_enable(md->mport, 1); | |
1585 | } | |
1586 | ||
1587 | return 0; | |
1588 | } | |
1589 | ||
1590 | static void rio_mport_delete_pw_filter(struct rio_mport_pw_filter *pw_filter) | |
1591 | { | |
1592 | list_del(&pw_filter->md_node); | |
1593 | list_del(&pw_filter->priv_node); | |
1594 | kfree(pw_filter); | |
1595 | } | |
1596 | ||
1597 | static int rio_mport_match_pw_filter(struct rio_pw_filter *a, | |
1598 | struct rio_pw_filter *b) | |
1599 | { | |
1600 | if ((a->mask == b->mask) && (a->low == b->low) && (a->high == b->high)) | |
1601 | return 1; | |
1602 | return 0; | |
1603 | } | |
1604 | ||
1605 | static int rio_mport_remove_pw_filter(struct mport_cdev_priv *priv, | |
1606 | void __user *arg) | |
1607 | { | |
1608 | struct mport_dev *md = priv->md; | |
1609 | struct rio_mport_pw_filter *pw_filter; | |
1610 | struct rio_pw_filter filter; | |
1611 | unsigned long flags; | |
1612 | int ret = -EINVAL; | |
1613 | int hdel = 0; | |
1614 | ||
1615 | if (copy_from_user(&filter, arg, sizeof(filter))) | |
1616 | return -EFAULT; | |
1617 | ||
1618 | spin_lock_irqsave(&md->pw_lock, flags); | |
1619 | list_for_each_entry(pw_filter, &priv->pw_filters, priv_node) { | |
1620 | if (rio_mport_match_pw_filter(&pw_filter->filter, &filter)) { | |
1621 | rio_mport_delete_pw_filter(pw_filter); | |
1622 | ret = 0; | |
1623 | break; | |
1624 | } | |
1625 | } | |
1626 | ||
1627 | if (list_empty(&md->portwrites)) | |
1628 | hdel = 1; | |
1629 | spin_unlock_irqrestore(&md->pw_lock, flags); | |
1630 | ||
1631 | if (hdel) { | |
1632 | rio_del_mport_pw_handler(md->mport, priv->md, | |
1633 | rio_mport_pw_handler); | |
1634 | rio_pw_enable(md->mport, 0); | |
1635 | } | |
1636 | ||
1637 | return ret; | |
1638 | } | |
1639 | ||
1640 | /* | |
1641 | * rio_release_dev - release routine for kernel RIO device object | |
1642 | * @dev: kernel device object associated with a RIO device structure | |
1643 | * | |
1644 | * Frees a RIO device struct associated a RIO device struct. | |
1645 | * The RIO device struct is freed. | |
1646 | */ | |
1647 | static void rio_release_dev(struct device *dev) | |
1648 | { | |
1649 | struct rio_dev *rdev; | |
1650 | ||
1651 | rdev = to_rio_dev(dev); | |
1652 | pr_info(DRV_PREFIX "%s: %s\n", __func__, rio_name(rdev)); | |
1653 | kfree(rdev); | |
1654 | } | |
1655 | ||
1656 | ||
1657 | static void rio_release_net(struct device *dev) | |
1658 | { | |
1659 | struct rio_net *net; | |
1660 | ||
1661 | net = to_rio_net(dev); | |
1662 | rmcd_debug(RDEV, "net_%d", net->id); | |
1663 | kfree(net); | |
1664 | } | |
1665 | ||
1666 | ||
1667 | /* | |
1668 | * rio_mport_add_riodev - creates a kernel RIO device object | |
1669 | * | |
1670 | * Allocates a RIO device data structure and initializes required fields based | |
1671 | * on device's configuration space contents. | |
1672 | * If the device has switch capabilities, then a switch specific portion is | |
1673 | * allocated and configured. | |
1674 | */ | |
1675 | static int rio_mport_add_riodev(struct mport_cdev_priv *priv, | |
1676 | void __user *arg) | |
1677 | { | |
1678 | struct mport_dev *md = priv->md; | |
1679 | struct rio_rdev_info dev_info; | |
1680 | struct rio_dev *rdev; | |
1681 | struct rio_switch *rswitch = NULL; | |
1682 | struct rio_mport *mport; | |
85094c05 | 1683 | struct device *dev; |
e8de3701 AB |
1684 | size_t size; |
1685 | u32 rval; | |
1686 | u32 swpinfo = 0; | |
1687 | u16 destid; | |
1688 | u8 hopcount; | |
1689 | int err; | |
1690 | ||
1691 | if (copy_from_user(&dev_info, arg, sizeof(dev_info))) | |
1692 | return -EFAULT; | |
156e0b1a | 1693 | dev_info.name[sizeof(dev_info.name) - 1] = '\0'; |
e8de3701 AB |
1694 | |
1695 | rmcd_debug(RDEV, "name:%s ct:0x%x did:0x%x hc:0x%x", dev_info.name, | |
1696 | dev_info.comptag, dev_info.destid, dev_info.hopcount); | |
1697 | ||
85094c05 JX |
1698 | dev = bus_find_device_by_name(&rio_bus_type, NULL, dev_info.name); |
1699 | if (dev) { | |
e8de3701 | 1700 | rmcd_debug(RDEV, "device %s already exists", dev_info.name); |
85094c05 | 1701 | put_device(dev); |
e8de3701 AB |
1702 | return -EEXIST; |
1703 | } | |
1704 | ||
4e1016da | 1705 | size = sizeof(*rdev); |
e8de3701 | 1706 | mport = md->mport; |
4e1016da AB |
1707 | destid = dev_info.destid; |
1708 | hopcount = dev_info.hopcount; | |
e8de3701 AB |
1709 | |
1710 | if (rio_mport_read_config_32(mport, destid, hopcount, | |
1711 | RIO_PEF_CAR, &rval)) | |
1712 | return -EIO; | |
1713 | ||
1714 | if (rval & RIO_PEF_SWITCH) { | |
1715 | rio_mport_read_config_32(mport, destid, hopcount, | |
1716 | RIO_SWP_INFO_CAR, &swpinfo); | |
216ec27f | 1717 | size += struct_size(rswitch, nextdev, RIO_GET_TOTAL_PORTS(swpinfo)); |
e8de3701 AB |
1718 | } |
1719 | ||
1720 | rdev = kzalloc(size, GFP_KERNEL); | |
1721 | if (rdev == NULL) | |
1722 | return -ENOMEM; | |
1723 | ||
1724 | if (mport->net == NULL) { | |
1725 | struct rio_net *net; | |
1726 | ||
1727 | net = rio_alloc_net(mport); | |
1728 | if (!net) { | |
1729 | err = -ENOMEM; | |
1730 | rmcd_debug(RDEV, "failed to allocate net object"); | |
1731 | goto cleanup; | |
1732 | } | |
1733 | ||
1734 | net->id = mport->id; | |
1735 | net->hport = mport; | |
1736 | dev_set_name(&net->dev, "rnet_%d", net->id); | |
1737 | net->dev.parent = &mport->dev; | |
1738 | net->dev.release = rio_release_net; | |
1739 | err = rio_add_net(net); | |
1740 | if (err) { | |
1741 | rmcd_debug(RDEV, "failed to register net, err=%d", err); | |
1742 | kfree(net); | |
1743 | goto cleanup; | |
1744 | } | |
1745 | } | |
1746 | ||
1747 | rdev->net = mport->net; | |
1748 | rdev->pef = rval; | |
1749 | rdev->swpinfo = swpinfo; | |
1750 | rio_mport_read_config_32(mport, destid, hopcount, | |
1751 | RIO_DEV_ID_CAR, &rval); | |
1752 | rdev->did = rval >> 16; | |
1753 | rdev->vid = rval & 0xffff; | |
1754 | rio_mport_read_config_32(mport, destid, hopcount, RIO_DEV_INFO_CAR, | |
1755 | &rdev->device_rev); | |
1756 | rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_ID_CAR, | |
1757 | &rval); | |
1758 | rdev->asm_did = rval >> 16; | |
1759 | rdev->asm_vid = rval & 0xffff; | |
1760 | rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_INFO_CAR, | |
1761 | &rval); | |
1762 | rdev->asm_rev = rval >> 16; | |
1763 | ||
1764 | if (rdev->pef & RIO_PEF_EXT_FEATURES) { | |
1765 | rdev->efptr = rval & 0xffff; | |
1766 | rdev->phys_efptr = rio_mport_get_physefb(mport, 0, destid, | |
1ae842de | 1767 | hopcount, &rdev->phys_rmap); |
e8de3701 AB |
1768 | |
1769 | rdev->em_efptr = rio_mport_get_feature(mport, 0, destid, | |
1770 | hopcount, RIO_EFB_ERR_MGMNT); | |
1771 | } | |
1772 | ||
1773 | rio_mport_read_config_32(mport, destid, hopcount, RIO_SRC_OPS_CAR, | |
1774 | &rdev->src_ops); | |
1775 | rio_mport_read_config_32(mport, destid, hopcount, RIO_DST_OPS_CAR, | |
1776 | &rdev->dst_ops); | |
1777 | ||
1778 | rdev->comp_tag = dev_info.comptag; | |
1779 | rdev->destid = destid; | |
1780 | /* hopcount is stored as specified by a caller, regardles of EP or SW */ | |
1781 | rdev->hopcount = hopcount; | |
1782 | ||
1783 | if (rdev->pef & RIO_PEF_SWITCH) { | |
1784 | rswitch = rdev->rswitch; | |
1785 | rswitch->route_table = NULL; | |
1786 | } | |
1787 | ||
1788 | if (strlen(dev_info.name)) | |
1789 | dev_set_name(&rdev->dev, "%s", dev_info.name); | |
1790 | else if (rdev->pef & RIO_PEF_SWITCH) | |
1791 | dev_set_name(&rdev->dev, "%02x:s:%04x", mport->id, | |
1792 | rdev->comp_tag & RIO_CTAG_UDEVID); | |
1793 | else | |
1794 | dev_set_name(&rdev->dev, "%02x:e:%04x", mport->id, | |
1795 | rdev->comp_tag & RIO_CTAG_UDEVID); | |
1796 | ||
1797 | INIT_LIST_HEAD(&rdev->net_list); | |
1798 | rdev->dev.parent = &mport->net->dev; | |
1799 | rio_attach_device(rdev); | |
1800 | rdev->dev.release = rio_release_dev; | |
1801 | ||
1802 | if (rdev->dst_ops & RIO_DST_OPS_DOORBELL) | |
1803 | rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE], | |
1804 | 0, 0xffff); | |
1805 | err = rio_add_device(rdev); | |
1806 | if (err) | |
1807 | goto cleanup; | |
1808 | rio_dev_get(rdev); | |
1809 | ||
1810 | return 0; | |
1811 | cleanup: | |
1812 | kfree(rdev); | |
1813 | return err; | |
1814 | } | |
1815 | ||
1816 | static int rio_mport_del_riodev(struct mport_cdev_priv *priv, void __user *arg) | |
1817 | { | |
1818 | struct rio_rdev_info dev_info; | |
1819 | struct rio_dev *rdev = NULL; | |
1820 | struct device *dev; | |
1821 | struct rio_mport *mport; | |
1822 | struct rio_net *net; | |
1823 | ||
1824 | if (copy_from_user(&dev_info, arg, sizeof(dev_info))) | |
1825 | return -EFAULT; | |
156e0b1a | 1826 | dev_info.name[sizeof(dev_info.name) - 1] = '\0'; |
e8de3701 AB |
1827 | |
1828 | mport = priv->md->mport; | |
1829 | ||
1830 | /* If device name is specified, removal by name has priority */ | |
1831 | if (strlen(dev_info.name)) { | |
1832 | dev = bus_find_device_by_name(&rio_bus_type, NULL, | |
1833 | dev_info.name); | |
1834 | if (dev) | |
1835 | rdev = to_rio_dev(dev); | |
1836 | } else { | |
1837 | do { | |
1838 | rdev = rio_get_comptag(dev_info.comptag, rdev); | |
1839 | if (rdev && rdev->dev.parent == &mport->net->dev && | |
4e1016da AB |
1840 | rdev->destid == dev_info.destid && |
1841 | rdev->hopcount == dev_info.hopcount) | |
e8de3701 AB |
1842 | break; |
1843 | } while (rdev); | |
1844 | } | |
1845 | ||
1846 | if (!rdev) { | |
1847 | rmcd_debug(RDEV, | |
1848 | "device name:%s ct:0x%x did:0x%x hc:0x%x not found", | |
1849 | dev_info.name, dev_info.comptag, dev_info.destid, | |
1850 | dev_info.hopcount); | |
1851 | return -ENODEV; | |
1852 | } | |
1853 | ||
1854 | net = rdev->net; | |
1855 | rio_dev_put(rdev); | |
1856 | rio_del_device(rdev, RIO_DEVICE_SHUTDOWN); | |
1857 | ||
1858 | if (list_empty(&net->devices)) { | |
1859 | rio_free_net(net); | |
1860 | mport->net = NULL; | |
1861 | } | |
1862 | ||
1863 | return 0; | |
1864 | } | |
1865 | ||
1866 | /* | |
1867 | * Mport cdev management | |
1868 | */ | |
1869 | ||
1870 | /* | |
1871 | * mport_cdev_open() - Open character device (mport) | |
1872 | */ | |
1873 | static int mport_cdev_open(struct inode *inode, struct file *filp) | |
1874 | { | |
1875 | int ret; | |
1876 | int minor = iminor(inode); | |
1877 | struct mport_dev *chdev; | |
1878 | struct mport_cdev_priv *priv; | |
1879 | ||
1880 | /* Test for valid device */ | |
1881 | if (minor >= RIO_MAX_MPORTS) { | |
1882 | rmcd_error("Invalid minor device number"); | |
1883 | return -EINVAL; | |
1884 | } | |
1885 | ||
1886 | chdev = container_of(inode->i_cdev, struct mport_dev, cdev); | |
1887 | ||
1888 | rmcd_debug(INIT, "%s filp=%p", dev_name(&chdev->dev), filp); | |
1889 | ||
1890 | if (atomic_read(&chdev->active) == 0) | |
1891 | return -ENODEV; | |
1892 | ||
1893 | get_device(&chdev->dev); | |
1894 | ||
1895 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
1896 | if (!priv) { | |
1897 | put_device(&chdev->dev); | |
1898 | return -ENOMEM; | |
1899 | } | |
1900 | ||
1901 | priv->md = chdev; | |
1902 | ||
1903 | mutex_lock(&chdev->file_mutex); | |
1904 | list_add_tail(&priv->list, &chdev->file_list); | |
1905 | mutex_unlock(&chdev->file_mutex); | |
1906 | ||
1907 | INIT_LIST_HEAD(&priv->db_filters); | |
1908 | INIT_LIST_HEAD(&priv->pw_filters); | |
1909 | spin_lock_init(&priv->fifo_lock); | |
1910 | init_waitqueue_head(&priv->event_rx_wait); | |
1911 | ret = kfifo_alloc(&priv->event_fifo, | |
1912 | sizeof(struct rio_event) * MPORT_EVENT_DEPTH, | |
1913 | GFP_KERNEL); | |
1914 | if (ret < 0) { | |
1915 | dev_err(&chdev->dev, DRV_NAME ": kfifo_alloc failed\n"); | |
1916 | ret = -ENOMEM; | |
1917 | goto err_fifo; | |
1918 | } | |
1919 | ||
1920 | #ifdef CONFIG_RAPIDIO_DMA_ENGINE | |
1921 | INIT_LIST_HEAD(&priv->async_list); | |
e8de3701 AB |
1922 | spin_lock_init(&priv->req_lock); |
1923 | mutex_init(&priv->dma_lock); | |
1924 | #endif | |
1925 | ||
1926 | filp->private_data = priv; | |
1927 | goto out; | |
1928 | err_fifo: | |
1929 | kfree(priv); | |
1930 | out: | |
1931 | return ret; | |
1932 | } | |
1933 | ||
1934 | static int mport_cdev_fasync(int fd, struct file *filp, int mode) | |
1935 | { | |
1936 | struct mport_cdev_priv *priv = filp->private_data; | |
1937 | ||
1938 | return fasync_helper(fd, filp, mode, &priv->async_queue); | |
1939 | } | |
1940 | ||
1941 | #ifdef CONFIG_RAPIDIO_DMA_ENGINE | |
1942 | static void mport_cdev_release_dma(struct file *filp) | |
1943 | { | |
1944 | struct mport_cdev_priv *priv = filp->private_data; | |
1945 | struct mport_dev *md; | |
1946 | struct mport_dma_req *req, *req_next; | |
1947 | unsigned long tmo = msecs_to_jiffies(dma_timeout); | |
1948 | long wret; | |
1949 | LIST_HEAD(list); | |
1950 | ||
1951 | rmcd_debug(EXIT, "from filp=%p %s(%d)", | |
1952 | filp, current->comm, task_pid_nr(current)); | |
1953 | ||
1954 | if (!priv->dmach) { | |
1955 | rmcd_debug(EXIT, "No DMA channel for filp=%p", filp); | |
1956 | return; | |
1957 | } | |
1958 | ||
1959 | md = priv->md; | |
1960 | ||
e8de3701 AB |
1961 | spin_lock(&priv->req_lock); |
1962 | if (!list_empty(&priv->async_list)) { | |
1963 | rmcd_debug(EXIT, "async list not empty filp=%p %s(%d)", | |
1964 | filp, current->comm, task_pid_nr(current)); | |
1965 | list_splice_init(&priv->async_list, &list); | |
1966 | } | |
1967 | spin_unlock(&priv->req_lock); | |
1968 | ||
1969 | if (!list_empty(&list)) { | |
1970 | rmcd_debug(EXIT, "temp list not empty"); | |
1971 | list_for_each_entry_safe(req, req_next, &list, node) { | |
1972 | rmcd_debug(EXIT, "free req->filp=%p cookie=%d compl=%s", | |
1973 | req->filp, req->cookie, | |
1974 | completion_done(&req->req_comp)?"yes":"no"); | |
1975 | list_del(&req->node); | |
bbd876ad | 1976 | kref_put(&req->refcount, dma_req_free); |
e8de3701 AB |
1977 | } |
1978 | } | |
1979 | ||
1980 | put_dma_channel(priv); | |
1981 | wret = wait_for_completion_interruptible_timeout(&priv->comp, tmo); | |
1982 | ||
1983 | if (wret <= 0) { | |
1984 | rmcd_error("%s(%d) failed waiting for DMA release err=%ld", | |
1985 | current->comm, task_pid_nr(current), wret); | |
1986 | } | |
1987 | ||
e8de3701 AB |
1988 | if (priv->dmach != priv->md->dma_chan) { |
1989 | rmcd_debug(EXIT, "Release DMA channel for filp=%p %s(%d)", | |
1990 | filp, current->comm, task_pid_nr(current)); | |
1991 | rio_release_dma(priv->dmach); | |
1992 | } else { | |
1993 | rmcd_debug(EXIT, "Adjust default DMA channel refcount"); | |
1994 | kref_put(&md->dma_ref, mport_release_def_dma); | |
1995 | } | |
1996 | ||
1997 | priv->dmach = NULL; | |
1998 | } | |
1999 | #else | |
2000 | #define mport_cdev_release_dma(priv) do {} while (0) | |
2001 | #endif | |
2002 | ||
2003 | /* | |
2004 | * mport_cdev_release() - Release character device | |
2005 | */ | |
2006 | static int mport_cdev_release(struct inode *inode, struct file *filp) | |
2007 | { | |
2008 | struct mport_cdev_priv *priv = filp->private_data; | |
2009 | struct mport_dev *chdev; | |
2010 | struct rio_mport_pw_filter *pw_filter, *pw_filter_next; | |
2011 | struct rio_mport_db_filter *db_filter, *db_filter_next; | |
2012 | struct rio_mport_mapping *map, *_map; | |
2013 | unsigned long flags; | |
2014 | ||
2015 | rmcd_debug(EXIT, "%s filp=%p", dev_name(&priv->md->dev), filp); | |
2016 | ||
2017 | chdev = priv->md; | |
2018 | mport_cdev_release_dma(filp); | |
2019 | ||
2020 | priv->event_mask = 0; | |
2021 | ||
2022 | spin_lock_irqsave(&chdev->pw_lock, flags); | |
2023 | if (!list_empty(&priv->pw_filters)) { | |
2024 | list_for_each_entry_safe(pw_filter, pw_filter_next, | |
2025 | &priv->pw_filters, priv_node) | |
2026 | rio_mport_delete_pw_filter(pw_filter); | |
2027 | } | |
2028 | spin_unlock_irqrestore(&chdev->pw_lock, flags); | |
2029 | ||
2030 | spin_lock_irqsave(&chdev->db_lock, flags); | |
2031 | list_for_each_entry_safe(db_filter, db_filter_next, | |
2032 | &priv->db_filters, priv_node) { | |
2033 | rio_mport_delete_db_filter(db_filter); | |
2034 | } | |
2035 | spin_unlock_irqrestore(&chdev->db_lock, flags); | |
2036 | ||
2037 | kfifo_free(&priv->event_fifo); | |
2038 | ||
2039 | mutex_lock(&chdev->buf_mutex); | |
2040 | list_for_each_entry_safe(map, _map, &chdev->mappings, node) { | |
2041 | if (map->filp == filp) { | |
2042 | rmcd_debug(EXIT, "release mapping %p filp=%p", | |
2043 | map->virt_addr, filp); | |
2044 | kref_put(&map->ref, mport_release_mapping); | |
2045 | } | |
2046 | } | |
2047 | mutex_unlock(&chdev->buf_mutex); | |
2048 | ||
2049 | mport_cdev_fasync(-1, filp, 0); | |
2050 | filp->private_data = NULL; | |
2051 | mutex_lock(&chdev->file_mutex); | |
2052 | list_del(&priv->list); | |
2053 | mutex_unlock(&chdev->file_mutex); | |
2054 | put_device(&chdev->dev); | |
2055 | kfree(priv); | |
2056 | return 0; | |
2057 | } | |
2058 | ||
2059 | /* | |
2060 | * mport_cdev_ioctl() - IOCTLs for character device | |
2061 | */ | |
2062 | static long mport_cdev_ioctl(struct file *filp, | |
2063 | unsigned int cmd, unsigned long arg) | |
2064 | { | |
2065 | int err = -EINVAL; | |
2066 | struct mport_cdev_priv *data = filp->private_data; | |
2067 | struct mport_dev *md = data->md; | |
2068 | ||
2069 | if (atomic_read(&md->active) == 0) | |
2070 | return -ENODEV; | |
2071 | ||
2072 | switch (cmd) { | |
2073 | case RIO_MPORT_MAINT_READ_LOCAL: | |
2074 | return rio_mport_maint_rd(data, (void __user *)arg, 1); | |
2075 | case RIO_MPORT_MAINT_WRITE_LOCAL: | |
2076 | return rio_mport_maint_wr(data, (void __user *)arg, 1); | |
2077 | case RIO_MPORT_MAINT_READ_REMOTE: | |
2078 | return rio_mport_maint_rd(data, (void __user *)arg, 0); | |
2079 | case RIO_MPORT_MAINT_WRITE_REMOTE: | |
2080 | return rio_mport_maint_wr(data, (void __user *)arg, 0); | |
2081 | case RIO_MPORT_MAINT_HDID_SET: | |
2082 | return maint_hdid_set(data, (void __user *)arg); | |
2083 | case RIO_MPORT_MAINT_COMPTAG_SET: | |
2084 | return maint_comptag_set(data, (void __user *)arg); | |
2085 | case RIO_MPORT_MAINT_PORT_IDX_GET: | |
2086 | return maint_port_idx_get(data, (void __user *)arg); | |
2087 | case RIO_MPORT_GET_PROPERTIES: | |
2088 | md->properties.hdid = md->mport->host_deviceid; | |
4e1016da AB |
2089 | if (copy_to_user((void __user *)arg, &(md->properties), |
2090 | sizeof(md->properties))) | |
e8de3701 AB |
2091 | return -EFAULT; |
2092 | return 0; | |
2093 | case RIO_ENABLE_DOORBELL_RANGE: | |
2094 | return rio_mport_add_db_filter(data, (void __user *)arg); | |
2095 | case RIO_DISABLE_DOORBELL_RANGE: | |
2096 | return rio_mport_remove_db_filter(data, (void __user *)arg); | |
2097 | case RIO_ENABLE_PORTWRITE_RANGE: | |
2098 | return rio_mport_add_pw_filter(data, (void __user *)arg); | |
2099 | case RIO_DISABLE_PORTWRITE_RANGE: | |
2100 | return rio_mport_remove_pw_filter(data, (void __user *)arg); | |
2101 | case RIO_SET_EVENT_MASK: | |
4e1016da | 2102 | data->event_mask = (u32)arg; |
e8de3701 AB |
2103 | return 0; |
2104 | case RIO_GET_EVENT_MASK: | |
2105 | if (copy_to_user((void __user *)arg, &data->event_mask, | |
4e1016da | 2106 | sizeof(u32))) |
e8de3701 AB |
2107 | return -EFAULT; |
2108 | return 0; | |
2109 | case RIO_MAP_OUTBOUND: | |
2110 | return rio_mport_obw_map(filp, (void __user *)arg); | |
2111 | case RIO_MAP_INBOUND: | |
2112 | return rio_mport_map_inbound(filp, (void __user *)arg); | |
2113 | case RIO_UNMAP_OUTBOUND: | |
2114 | return rio_mport_obw_free(filp, (void __user *)arg); | |
2115 | case RIO_UNMAP_INBOUND: | |
2116 | return rio_mport_inbound_free(filp, (void __user *)arg); | |
2117 | case RIO_ALLOC_DMA: | |
2118 | return rio_mport_alloc_dma(filp, (void __user *)arg); | |
2119 | case RIO_FREE_DMA: | |
2120 | return rio_mport_free_dma(filp, (void __user *)arg); | |
2121 | case RIO_WAIT_FOR_ASYNC: | |
2122 | return rio_mport_wait_for_async_dma(filp, (void __user *)arg); | |
2123 | case RIO_TRANSFER: | |
2124 | return rio_mport_transfer_ioctl(filp, (void __user *)arg); | |
2125 | case RIO_DEV_ADD: | |
2126 | return rio_mport_add_riodev(data, (void __user *)arg); | |
2127 | case RIO_DEV_DEL: | |
2128 | return rio_mport_del_riodev(data, (void __user *)arg); | |
2129 | default: | |
2130 | break; | |
2131 | } | |
2132 | ||
2133 | return err; | |
2134 | } | |
2135 | ||
2136 | /* | |
2137 | * mport_release_mapping - free mapping resources and info structure | |
2138 | * @ref: a pointer to the kref within struct rio_mport_mapping | |
2139 | * | |
2140 | * NOTE: Shall be called while holding buf_mutex. | |
2141 | */ | |
2142 | static void mport_release_mapping(struct kref *ref) | |
2143 | { | |
2144 | struct rio_mport_mapping *map = | |
2145 | container_of(ref, struct rio_mport_mapping, ref); | |
2146 | struct rio_mport *mport = map->md->mport; | |
2147 | ||
2148 | rmcd_debug(MMAP, "type %d mapping @ %p (phys = %pad) for %s", | |
2149 | map->dir, map->virt_addr, | |
2150 | &map->phys_addr, mport->name); | |
2151 | ||
2152 | list_del(&map->node); | |
2153 | ||
2154 | switch (map->dir) { | |
2155 | case MAP_INBOUND: | |
2156 | rio_unmap_inb_region(mport, map->phys_addr); | |
df561f66 | 2157 | fallthrough; |
e8de3701 AB |
2158 | case MAP_DMA: |
2159 | dma_free_coherent(mport->dev.parent, map->size, | |
2160 | map->virt_addr, map->phys_addr); | |
2161 | break; | |
2162 | case MAP_OUTBOUND: | |
2163 | rio_unmap_outb_region(mport, map->rioid, map->rio_addr); | |
2164 | break; | |
2165 | } | |
2166 | kfree(map); | |
2167 | } | |
2168 | ||
2169 | static void mport_mm_open(struct vm_area_struct *vma) | |
2170 | { | |
2171 | struct rio_mport_mapping *map = vma->vm_private_data; | |
2172 | ||
ea87b8e1 | 2173 | rmcd_debug(MMAP, "%pad", &map->phys_addr); |
e8de3701 AB |
2174 | kref_get(&map->ref); |
2175 | } | |
2176 | ||
2177 | static void mport_mm_close(struct vm_area_struct *vma) | |
2178 | { | |
2179 | struct rio_mport_mapping *map = vma->vm_private_data; | |
2180 | ||
ea87b8e1 | 2181 | rmcd_debug(MMAP, "%pad", &map->phys_addr); |
e8de3701 AB |
2182 | mutex_lock(&map->md->buf_mutex); |
2183 | kref_put(&map->ref, mport_release_mapping); | |
2184 | mutex_unlock(&map->md->buf_mutex); | |
2185 | } | |
2186 | ||
2187 | static const struct vm_operations_struct vm_ops = { | |
2188 | .open = mport_mm_open, | |
2189 | .close = mport_mm_close, | |
2190 | }; | |
2191 | ||
2192 | static int mport_cdev_mmap(struct file *filp, struct vm_area_struct *vma) | |
2193 | { | |
2194 | struct mport_cdev_priv *priv = filp->private_data; | |
2195 | struct mport_dev *md; | |
2196 | size_t size = vma->vm_end - vma->vm_start; | |
2197 | dma_addr_t baddr; | |
2198 | unsigned long offset; | |
2199 | int found = 0, ret; | |
2200 | struct rio_mport_mapping *map; | |
2201 | ||
2202 | rmcd_debug(MMAP, "0x%x bytes at offset 0x%lx", | |
2203 | (unsigned int)size, vma->vm_pgoff); | |
2204 | ||
2205 | md = priv->md; | |
2206 | baddr = ((dma_addr_t)vma->vm_pgoff << PAGE_SHIFT); | |
2207 | ||
2208 | mutex_lock(&md->buf_mutex); | |
2209 | list_for_each_entry(map, &md->mappings, node) { | |
2210 | if (baddr >= map->phys_addr && | |
2211 | baddr < (map->phys_addr + map->size)) { | |
2212 | found = 1; | |
2213 | break; | |
2214 | } | |
2215 | } | |
2216 | mutex_unlock(&md->buf_mutex); | |
2217 | ||
2218 | if (!found) | |
2219 | return -ENOMEM; | |
2220 | ||
2221 | offset = baddr - map->phys_addr; | |
2222 | ||
2223 | if (size + offset > map->size) | |
2224 | return -EINVAL; | |
2225 | ||
2226 | vma->vm_pgoff = offset >> PAGE_SHIFT; | |
2227 | rmcd_debug(MMAP, "MMAP adjusted offset = 0x%lx", vma->vm_pgoff); | |
2228 | ||
2229 | if (map->dir == MAP_INBOUND || map->dir == MAP_DMA) | |
2230 | ret = dma_mmap_coherent(md->mport->dev.parent, vma, | |
2231 | map->virt_addr, map->phys_addr, map->size); | |
2232 | else if (map->dir == MAP_OUTBOUND) { | |
2233 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
2234 | ret = vm_iomap_memory(vma, map->phys_addr, map->size); | |
2235 | } else { | |
2236 | rmcd_error("Attempt to mmap unsupported mapping type"); | |
2237 | ret = -EIO; | |
2238 | } | |
2239 | ||
2240 | if (!ret) { | |
2241 | vma->vm_private_data = map; | |
2242 | vma->vm_ops = &vm_ops; | |
2243 | mport_mm_open(vma); | |
2244 | } else { | |
2245 | rmcd_error("MMAP exit with err=%d", ret); | |
2246 | } | |
2247 | ||
2248 | return ret; | |
2249 | } | |
2250 | ||
afc9a42b | 2251 | static __poll_t mport_cdev_poll(struct file *filp, poll_table *wait) |
e8de3701 AB |
2252 | { |
2253 | struct mport_cdev_priv *priv = filp->private_data; | |
2254 | ||
2255 | poll_wait(filp, &priv->event_rx_wait, wait); | |
2256 | if (kfifo_len(&priv->event_fifo)) | |
a9a08845 | 2257 | return EPOLLIN | EPOLLRDNORM; |
e8de3701 AB |
2258 | |
2259 | return 0; | |
2260 | } | |
2261 | ||
2262 | static ssize_t mport_read(struct file *filp, char __user *buf, size_t count, | |
2263 | loff_t *ppos) | |
2264 | { | |
2265 | struct mport_cdev_priv *priv = filp->private_data; | |
2266 | int copied; | |
2267 | ssize_t ret; | |
2268 | ||
2269 | if (!count) | |
2270 | return 0; | |
2271 | ||
2272 | if (kfifo_is_empty(&priv->event_fifo) && | |
2273 | (filp->f_flags & O_NONBLOCK)) | |
2274 | return -EAGAIN; | |
2275 | ||
2276 | if (count % sizeof(struct rio_event)) | |
2277 | return -EINVAL; | |
2278 | ||
2279 | ret = wait_event_interruptible(priv->event_rx_wait, | |
2280 | kfifo_len(&priv->event_fifo) != 0); | |
2281 | if (ret) | |
2282 | return ret; | |
2283 | ||
2284 | while (ret < count) { | |
2285 | if (kfifo_to_user(&priv->event_fifo, buf, | |
2286 | sizeof(struct rio_event), &copied)) | |
2287 | return -EFAULT; | |
2288 | ret += copied; | |
2289 | buf += copied; | |
2290 | } | |
2291 | ||
2292 | return ret; | |
2293 | } | |
2294 | ||
2295 | static ssize_t mport_write(struct file *filp, const char __user *buf, | |
2296 | size_t count, loff_t *ppos) | |
2297 | { | |
2298 | struct mport_cdev_priv *priv = filp->private_data; | |
2299 | struct rio_mport *mport = priv->md->mport; | |
2300 | struct rio_event event; | |
2301 | int len, ret; | |
2302 | ||
2303 | if (!count) | |
2304 | return 0; | |
2305 | ||
2306 | if (count % sizeof(event)) | |
2307 | return -EINVAL; | |
2308 | ||
2309 | len = 0; | |
2310 | while ((count - len) >= (int)sizeof(event)) { | |
2311 | if (copy_from_user(&event, buf, sizeof(event))) | |
2312 | return -EFAULT; | |
2313 | ||
2314 | if (event.header != RIO_DOORBELL) | |
2315 | return -EINVAL; | |
2316 | ||
2317 | ret = rio_mport_send_doorbell(mport, | |
4e1016da | 2318 | event.u.doorbell.rioid, |
e8de3701 AB |
2319 | event.u.doorbell.payload); |
2320 | if (ret < 0) | |
2321 | return ret; | |
2322 | ||
2323 | len += sizeof(event); | |
2324 | buf += sizeof(event); | |
2325 | } | |
2326 | ||
2327 | return len; | |
2328 | } | |
2329 | ||
2330 | static const struct file_operations mport_fops = { | |
2331 | .owner = THIS_MODULE, | |
2332 | .open = mport_cdev_open, | |
2333 | .release = mport_cdev_release, | |
2334 | .poll = mport_cdev_poll, | |
2335 | .read = mport_read, | |
2336 | .write = mport_write, | |
2337 | .mmap = mport_cdev_mmap, | |
2338 | .fasync = mport_cdev_fasync, | |
2339 | .unlocked_ioctl = mport_cdev_ioctl | |
2340 | }; | |
2341 | ||
2342 | /* | |
2343 | * Character device management | |
2344 | */ | |
2345 | ||
2346 | static void mport_device_release(struct device *dev) | |
2347 | { | |
2348 | struct mport_dev *md; | |
2349 | ||
2350 | rmcd_debug(EXIT, "%s", dev_name(dev)); | |
2351 | md = container_of(dev, struct mport_dev, dev); | |
2352 | kfree(md); | |
2353 | } | |
2354 | ||
2355 | /* | |
2356 | * mport_cdev_add() - Create mport_dev from rio_mport | |
2357 | * @mport: RapidIO master port | |
2358 | */ | |
2359 | static struct mport_dev *mport_cdev_add(struct rio_mport *mport) | |
2360 | { | |
2361 | int ret = 0; | |
2362 | struct mport_dev *md; | |
2363 | struct rio_mport_attr attr; | |
2364 | ||
4e1016da | 2365 | md = kzalloc(sizeof(*md), GFP_KERNEL); |
e8de3701 AB |
2366 | if (!md) { |
2367 | rmcd_error("Unable allocate a device object"); | |
2368 | return NULL; | |
2369 | } | |
2370 | ||
2371 | md->mport = mport; | |
2372 | mutex_init(&md->buf_mutex); | |
2373 | mutex_init(&md->file_mutex); | |
2374 | INIT_LIST_HEAD(&md->file_list); | |
e8de3701 | 2375 | |
dbef390d LG |
2376 | device_initialize(&md->dev); |
2377 | md->dev.devt = MKDEV(MAJOR(dev_number), mport->id); | |
e8de3701 AB |
2378 | md->dev.class = dev_class; |
2379 | md->dev.parent = &mport->dev; | |
2380 | md->dev.release = mport_device_release; | |
2381 | dev_set_name(&md->dev, DEV_NAME "%d", mport->id); | |
2382 | atomic_set(&md->active, 1); | |
2383 | ||
dbef390d LG |
2384 | cdev_init(&md->cdev, &mport_fops); |
2385 | md->cdev.owner = THIS_MODULE; | |
2386 | ||
e8de3701 AB |
2387 | INIT_LIST_HEAD(&md->doorbells); |
2388 | spin_lock_init(&md->db_lock); | |
2389 | INIT_LIST_HEAD(&md->portwrites); | |
2390 | spin_lock_init(&md->pw_lock); | |
2391 | INIT_LIST_HEAD(&md->mappings); | |
2392 | ||
2393 | md->properties.id = mport->id; | |
2394 | md->properties.sys_size = mport->sys_size; | |
2395 | md->properties.hdid = mport->host_deviceid; | |
2396 | md->properties.index = mport->index; | |
2397 | ||
2398 | /* The transfer_mode property will be returned through mport query | |
2399 | * interface | |
2400 | */ | |
4e1016da | 2401 | #ifdef CONFIG_FSL_RIO /* for now: only on Freescale's SoCs */ |
e8de3701 AB |
2402 | md->properties.transfer_mode |= RIO_TRANSFER_MODE_MAPPED; |
2403 | #else | |
2404 | md->properties.transfer_mode |= RIO_TRANSFER_MODE_TRANSFER; | |
2405 | #endif | |
e1c3cdb2 MB |
2406 | |
2407 | ret = cdev_device_add(&md->cdev, &md->dev); | |
2408 | if (ret) { | |
2409 | rmcd_error("Failed to register mport %d (err=%d)", | |
2410 | mport->id, ret); | |
2411 | goto err_cdev; | |
2412 | } | |
e8de3701 AB |
2413 | ret = rio_query_mport(mport, &attr); |
2414 | if (!ret) { | |
2415 | md->properties.flags = attr.flags; | |
2416 | md->properties.link_speed = attr.link_speed; | |
2417 | md->properties.link_width = attr.link_width; | |
2418 | md->properties.dma_max_sge = attr.dma_max_sge; | |
2419 | md->properties.dma_max_size = attr.dma_max_size; | |
2420 | md->properties.dma_align = attr.dma_align; | |
2421 | md->properties.cap_sys_size = 0; | |
2422 | md->properties.cap_transfer_mode = 0; | |
2423 | md->properties.cap_addr_size = 0; | |
2424 | } else | |
2425 | pr_info(DRV_PREFIX "Failed to obtain info for %s cdev(%d:%d)\n", | |
2426 | mport->name, MAJOR(dev_number), mport->id); | |
2427 | ||
2428 | mutex_lock(&mport_devs_lock); | |
2429 | list_add_tail(&md->node, &mport_devs); | |
2430 | mutex_unlock(&mport_devs_lock); | |
2431 | ||
2432 | pr_info(DRV_PREFIX "Added %s cdev(%d:%d)\n", | |
2433 | mport->name, MAJOR(dev_number), mport->id); | |
2434 | ||
2435 | return md; | |
2436 | ||
2437 | err_cdev: | |
dbef390d | 2438 | put_device(&md->dev); |
e8de3701 AB |
2439 | return NULL; |
2440 | } | |
2441 | ||
2442 | /* | |
2443 | * mport_cdev_terminate_dma() - Stop all active DMA data transfers and release | |
2444 | * associated DMA channels. | |
2445 | */ | |
2446 | static void mport_cdev_terminate_dma(struct mport_dev *md) | |
2447 | { | |
2448 | #ifdef CONFIG_RAPIDIO_DMA_ENGINE | |
2449 | struct mport_cdev_priv *client; | |
2450 | ||
2451 | rmcd_debug(DMA, "%s", dev_name(&md->dev)); | |
2452 | ||
2453 | mutex_lock(&md->file_mutex); | |
2454 | list_for_each_entry(client, &md->file_list, list) { | |
2455 | if (client->dmach) { | |
2456 | dmaengine_terminate_all(client->dmach); | |
2457 | rio_release_dma(client->dmach); | |
2458 | } | |
2459 | } | |
2460 | mutex_unlock(&md->file_mutex); | |
2461 | ||
2462 | if (md->dma_chan) { | |
2463 | dmaengine_terminate_all(md->dma_chan); | |
2464 | rio_release_dma(md->dma_chan); | |
2465 | md->dma_chan = NULL; | |
2466 | } | |
2467 | #endif | |
2468 | } | |
2469 | ||
2470 | ||
2471 | /* | |
2472 | * mport_cdev_kill_fasync() - Send SIGIO signal to all processes with open | |
2473 | * mport_cdev files. | |
2474 | */ | |
2475 | static int mport_cdev_kill_fasync(struct mport_dev *md) | |
2476 | { | |
2477 | unsigned int files = 0; | |
2478 | struct mport_cdev_priv *client; | |
2479 | ||
2480 | mutex_lock(&md->file_mutex); | |
2481 | list_for_each_entry(client, &md->file_list, list) { | |
2482 | if (client->async_queue) | |
2483 | kill_fasync(&client->async_queue, SIGIO, POLL_HUP); | |
2484 | files++; | |
2485 | } | |
2486 | mutex_unlock(&md->file_mutex); | |
2487 | return files; | |
2488 | } | |
2489 | ||
2490 | /* | |
2491 | * mport_cdev_remove() - Remove mport character device | |
2492 | * @dev: Mport device to remove | |
2493 | */ | |
2494 | static void mport_cdev_remove(struct mport_dev *md) | |
2495 | { | |
2496 | struct rio_mport_mapping *map, *_map; | |
2497 | ||
2498 | rmcd_debug(EXIT, "Remove %s cdev", md->mport->name); | |
2499 | atomic_set(&md->active, 0); | |
2500 | mport_cdev_terminate_dma(md); | |
2501 | rio_del_mport_pw_handler(md->mport, md, rio_mport_pw_handler); | |
dbef390d | 2502 | cdev_device_del(&md->cdev, &md->dev); |
e8de3701 AB |
2503 | mport_cdev_kill_fasync(md); |
2504 | ||
e8de3701 AB |
2505 | /* TODO: do we need to give clients some time to close file |
2506 | * descriptors? Simple wait for XX, or kref? | |
2507 | */ | |
2508 | ||
2509 | /* | |
2510 | * Release DMA buffers allocated for the mport device. | |
2511 | * Disable associated inbound Rapidio requests mapping if applicable. | |
2512 | */ | |
2513 | mutex_lock(&md->buf_mutex); | |
2514 | list_for_each_entry_safe(map, _map, &md->mappings, node) { | |
2515 | kref_put(&map->ref, mport_release_mapping); | |
2516 | } | |
2517 | mutex_unlock(&md->buf_mutex); | |
2518 | ||
2519 | if (!list_empty(&md->mappings)) | |
2520 | rmcd_warn("WARNING: %s pending mappings on removal", | |
2521 | md->mport->name); | |
2522 | ||
2523 | rio_release_inb_dbell(md->mport, 0, 0x0fff); | |
2524 | ||
e8de3701 AB |
2525 | put_device(&md->dev); |
2526 | } | |
2527 | ||
2528 | /* | |
2529 | * RIO rio_mport_interface driver | |
2530 | */ | |
2531 | ||
2532 | /* | |
2533 | * mport_add_mport() - Add rio_mport from LDM device struct | |
2534 | * @dev: Linux device model struct | |
2535 | * @class_intf: Linux class_interface | |
2536 | */ | |
2537 | static int mport_add_mport(struct device *dev, | |
2538 | struct class_interface *class_intf) | |
2539 | { | |
2540 | struct rio_mport *mport = NULL; | |
2541 | struct mport_dev *chdev = NULL; | |
2542 | ||
2543 | mport = to_rio_mport(dev); | |
2544 | if (!mport) | |
2545 | return -ENODEV; | |
2546 | ||
2547 | chdev = mport_cdev_add(mport); | |
2548 | if (!chdev) | |
2549 | return -ENODEV; | |
2550 | ||
2551 | return 0; | |
2552 | } | |
2553 | ||
2554 | /* | |
2555 | * mport_remove_mport() - Remove rio_mport from global list | |
2556 | * TODO remove device from global mport_dev list | |
2557 | */ | |
2558 | static void mport_remove_mport(struct device *dev, | |
2559 | struct class_interface *class_intf) | |
2560 | { | |
2561 | struct rio_mport *mport = NULL; | |
2562 | struct mport_dev *chdev; | |
2563 | int found = 0; | |
2564 | ||
2565 | mport = to_rio_mport(dev); | |
2566 | rmcd_debug(EXIT, "Remove %s", mport->name); | |
2567 | ||
2568 | mutex_lock(&mport_devs_lock); | |
2569 | list_for_each_entry(chdev, &mport_devs, node) { | |
2570 | if (chdev->mport->id == mport->id) { | |
2571 | atomic_set(&chdev->active, 0); | |
2572 | list_del(&chdev->node); | |
2573 | found = 1; | |
2574 | break; | |
2575 | } | |
2576 | } | |
2577 | mutex_unlock(&mport_devs_lock); | |
2578 | ||
2579 | if (found) | |
2580 | mport_cdev_remove(chdev); | |
2581 | } | |
2582 | ||
2583 | /* the rio_mport_interface is used to handle local mport devices */ | |
2584 | static struct class_interface rio_mport_interface __refdata = { | |
2585 | .class = &rio_mport_class, | |
2586 | .add_dev = mport_add_mport, | |
2587 | .remove_dev = mport_remove_mport, | |
2588 | }; | |
2589 | ||
2590 | /* | |
2591 | * Linux kernel module | |
2592 | */ | |
2593 | ||
2594 | /* | |
2595 | * mport_init - Driver module loading | |
2596 | */ | |
2597 | static int __init mport_init(void) | |
2598 | { | |
2599 | int ret; | |
2600 | ||
2601 | /* Create device class needed by udev */ | |
2602 | dev_class = class_create(THIS_MODULE, DRV_NAME); | |
99f23c2c | 2603 | if (IS_ERR(dev_class)) { |
e8de3701 | 2604 | rmcd_error("Unable to create " DRV_NAME " class"); |
99f23c2c | 2605 | return PTR_ERR(dev_class); |
e8de3701 AB |
2606 | } |
2607 | ||
2608 | ret = alloc_chrdev_region(&dev_number, 0, RIO_MAX_MPORTS, DRV_NAME); | |
2609 | if (ret < 0) | |
2610 | goto err_chr; | |
2611 | ||
2612 | rmcd_debug(INIT, "Registered class with major=%d", MAJOR(dev_number)); | |
2613 | ||
2614 | /* Register to rio_mport_interface */ | |
2615 | ret = class_interface_register(&rio_mport_interface); | |
2616 | if (ret) { | |
2617 | rmcd_error("class_interface_register() failed, err=%d", ret); | |
2618 | goto err_cli; | |
2619 | } | |
2620 | ||
e8de3701 AB |
2621 | return 0; |
2622 | ||
e8de3701 AB |
2623 | err_cli: |
2624 | unregister_chrdev_region(dev_number, RIO_MAX_MPORTS); | |
2625 | err_chr: | |
2626 | class_destroy(dev_class); | |
2627 | return ret; | |
2628 | } | |
2629 | ||
2630 | /** | |
2631 | * mport_exit - Driver module unloading | |
2632 | */ | |
2633 | static void __exit mport_exit(void) | |
2634 | { | |
2635 | class_interface_unregister(&rio_mport_interface); | |
2636 | class_destroy(dev_class); | |
2637 | unregister_chrdev_region(dev_number, RIO_MAX_MPORTS); | |
e8de3701 AB |
2638 | } |
2639 | ||
2640 | module_init(mport_init); | |
2641 | module_exit(mport_exit); |