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Commit | Line | Data |
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b530cc79 | 1 | /* |
fea511a6 | 2 | * The Virtio 9p transport driver |
b530cc79 | 3 | * |
e2735b77 EVH |
4 | * This is a block based transport driver based on the lguest block driver |
5 | * code. | |
b530cc79 | 6 | * |
fea511a6 | 7 | * Copyright (C) 2007, 2008 Eric Van Hensbergen, IBM Corporation |
b530cc79 EVH |
8 | * |
9 | * Based on virtio console driver | |
10 | * Copyright (C) 2006, 2007 Rusty Russell, IBM Corporation | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 | |
14 | * as published by the Free Software Foundation. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to: | |
23 | * Free Software Foundation | |
24 | * 51 Franklin Street, Fifth Floor | |
25 | * Boston, MA 02111-1301 USA | |
26 | * | |
27 | */ | |
28 | ||
29 | #include <linux/in.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/net.h> | |
32 | #include <linux/ipv6.h> | |
33 | #include <linux/errno.h> | |
34 | #include <linux/kernel.h> | |
35 | #include <linux/un.h> | |
36 | #include <linux/uaccess.h> | |
37 | #include <linux/inet.h> | |
38 | #include <linux/idr.h> | |
39 | #include <linux/file.h> | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
b530cc79 EVH |
41 | #include <net/9p/9p.h> |
42 | #include <linux/parser.h> | |
8b81ef58 | 43 | #include <net/9p/client.h> |
b530cc79 EVH |
44 | #include <net/9p/transport.h> |
45 | #include <linux/scatterlist.h> | |
46 | #include <linux/virtio.h> | |
47 | #include <linux/virtio_9p.h> | |
4038866d | 48 | #include "trans_common.h" |
b530cc79 | 49 | |
e2735b77 EVH |
50 | #define VIRTQUEUE_NUM 128 |
51 | ||
b530cc79 | 52 | /* a single mutex to manage channel initialization and attachment */ |
c1549497 | 53 | static DEFINE_MUTEX(virtio_9p_lock); |
b530cc79 | 54 | |
ee443996 EVH |
55 | /** |
56 | * struct virtio_chan - per-instance transport information | |
57 | * @initialized: whether the channel is initialized | |
58 | * @inuse: whether the channel is in use | |
59 | * @lock: protects multiple elements within this structure | |
0e15597e | 60 | * @client: client instance |
ee443996 EVH |
61 | * @vdev: virtio dev associated with this channel |
62 | * @vq: virtio queue associated with this channel | |
ee443996 EVH |
63 | * @sg: scatter gather list which is used to pack a request (protected?) |
64 | * | |
65 | * We keep all per-channel information in a structure. | |
b530cc79 EVH |
66 | * This structure is allocated within the devices dev->mem space. |
67 | * A pointer to the structure will get put in the transport private. | |
ee443996 | 68 | * |
b530cc79 | 69 | */ |
ee443996 | 70 | |
37c1209d | 71 | struct virtio_chan { |
ee443996 | 72 | bool inuse; |
b530cc79 | 73 | |
e2735b77 EVH |
74 | spinlock_t lock; |
75 | ||
fea511a6 | 76 | struct p9_client *client; |
b530cc79 | 77 | struct virtio_device *vdev; |
e2735b77 | 78 | struct virtqueue *vq; |
52f44e0d VJJ |
79 | int ring_bufs_avail; |
80 | wait_queue_head_t *vc_wq; | |
b530cc79 | 81 | |
e2735b77 EVH |
82 | /* Scatterlist: can be too big for stack. */ |
83 | struct scatterlist sg[VIRTQUEUE_NUM]; | |
37c1209d | 84 | |
97ee9b02 AK |
85 | int tag_len; |
86 | /* | |
87 | * tag name to identify a mount Non-null terminated | |
88 | */ | |
89 | char *tag; | |
90 | ||
37c1209d AK |
91 | struct list_head chan_list; |
92 | }; | |
93 | ||
94 | static struct list_head virtio_chan_list; | |
b530cc79 EVH |
95 | |
96 | /* How many bytes left in this page. */ | |
97 | static unsigned int rest_of_page(void *data) | |
98 | { | |
99 | return PAGE_SIZE - ((unsigned long)data % PAGE_SIZE); | |
100 | } | |
101 | ||
ee443996 EVH |
102 | /** |
103 | * p9_virtio_close - reclaim resources of a channel | |
0e15597e | 104 | * @client: client instance |
ee443996 EVH |
105 | * |
106 | * This reclaims a channel by freeing its resources and | |
107 | * reseting its inuse flag. | |
108 | * | |
109 | */ | |
110 | ||
8b81ef58 | 111 | static void p9_virtio_close(struct p9_client *client) |
e2735b77 | 112 | { |
8b81ef58 | 113 | struct virtio_chan *chan = client->trans; |
b530cc79 | 114 | |
c1549497 | 115 | mutex_lock(&virtio_9p_lock); |
fb786100 AK |
116 | if (chan) |
117 | chan->inuse = false; | |
c1549497 | 118 | mutex_unlock(&virtio_9p_lock); |
b530cc79 EVH |
119 | } |
120 | ||
ee443996 EVH |
121 | /** |
122 | * req_done - callback which signals activity from the server | |
123 | * @vq: virtio queue activity was received on | |
124 | * | |
125 | * This notifies us that the server has triggered some activity | |
126 | * on the virtio channel - most likely a response to request we | |
127 | * sent. Figure out which requests now have responses and wake up | |
128 | * those threads. | |
129 | * | |
130 | * Bugs: could do with some additional sanity checking, but appears to work. | |
131 | * | |
132 | */ | |
133 | ||
e2735b77 | 134 | static void req_done(struct virtqueue *vq) |
b530cc79 | 135 | { |
e2735b77 EVH |
136 | struct virtio_chan *chan = vq->vdev->priv; |
137 | struct p9_fcall *rc; | |
138 | unsigned int len; | |
e2735b77 | 139 | struct p9_req_t *req; |
419b3956 | 140 | unsigned long flags; |
e2735b77 | 141 | |
91b8534f EVH |
142 | P9_DPRINTK(P9_DEBUG_TRANS, ": request done\n"); |
143 | ||
a01a9840 | 144 | while (1) { |
419b3956 VJJ |
145 | spin_lock_irqsave(&chan->lock, flags); |
146 | rc = virtqueue_get_buf(chan->vq, &len); | |
419b3956 | 147 | |
a01a9840 | 148 | if (rc == NULL) { |
52f44e0d | 149 | spin_unlock_irqrestore(&chan->lock, flags); |
a01a9840 VJJ |
150 | break; |
151 | } | |
152 | ||
153 | chan->ring_bufs_avail = 1; | |
154 | spin_unlock_irqrestore(&chan->lock, flags); | |
155 | /* Wakeup if anyone waiting for VirtIO ring space. */ | |
156 | wake_up(chan->vc_wq); | |
157 | P9_DPRINTK(P9_DEBUG_TRANS, ": rc %p\n", rc); | |
158 | P9_DPRINTK(P9_DEBUG_TRANS, ": lookup tag %d\n", rc->tag); | |
159 | req = p9_tag_lookup(chan->client, rc->tag); | |
160 | if (req->tc->private) { | |
161 | struct trans_rpage_info *rp = req->tc->private; | |
162 | /*Release pages */ | |
163 | p9_release_req_pages(rp); | |
164 | if (rp->rp_alloc) | |
165 | kfree(rp); | |
166 | req->tc->private = NULL; | |
419b3956 | 167 | } |
a01a9840 VJJ |
168 | req->status = REQ_STATUS_RCVD; |
169 | p9_client_cb(chan->client, req); | |
170 | } | |
e2735b77 | 171 | } |
b530cc79 | 172 | |
ee443996 EVH |
173 | /** |
174 | * pack_sg_list - pack a scatter gather list from a linear buffer | |
175 | * @sg: scatter/gather list to pack into | |
176 | * @start: which segment of the sg_list to start at | |
177 | * @limit: maximum segment to pack data to | |
178 | * @data: data to pack into scatter/gather list | |
179 | * @count: amount of data to pack into the scatter/gather list | |
180 | * | |
181 | * sg_lists have multiple segments of various sizes. This will pack | |
182 | * arbitrary data into an existing scatter gather list, segmenting the | |
183 | * data as necessary within constraints. | |
184 | * | |
185 | */ | |
186 | ||
e2735b77 EVH |
187 | static int |
188 | pack_sg_list(struct scatterlist *sg, int start, int limit, char *data, | |
189 | int count) | |
190 | { | |
191 | int s; | |
192 | int index = start; | |
193 | ||
194 | while (count) { | |
195 | s = rest_of_page(data); | |
196 | if (s > count) | |
197 | s = count; | |
198 | sg_set_buf(&sg[index++], data, s); | |
199 | count -= s; | |
200 | data += s; | |
d6584f3a | 201 | BUG_ON(index > limit); |
e2735b77 | 202 | } |
b530cc79 | 203 | |
e2735b77 | 204 | return index-start; |
b530cc79 EVH |
205 | } |
206 | ||
91b8534f EVH |
207 | /* We don't currently allow canceling of virtio requests */ |
208 | static int p9_virtio_cancel(struct p9_client *client, struct p9_req_t *req) | |
209 | { | |
210 | return 1; | |
211 | } | |
212 | ||
4038866d VJJ |
213 | /** |
214 | * pack_sg_list_p - Just like pack_sg_list. Instead of taking a buffer, | |
215 | * this takes a list of pages. | |
216 | * @sg: scatter/gather list to pack into | |
217 | * @start: which segment of the sg_list to start at | |
218 | * @pdata_off: Offset into the first page | |
219 | * @**pdata: a list of pages to add into sg. | |
220 | * @count: amount of data to pack into the scatter/gather list | |
221 | */ | |
222 | static int | |
223 | pack_sg_list_p(struct scatterlist *sg, int start, int limit, size_t pdata_off, | |
224 | struct page **pdata, int count) | |
225 | { | |
226 | int s; | |
227 | int i = 0; | |
228 | int index = start; | |
229 | ||
230 | if (pdata_off) { | |
231 | s = min((int)(PAGE_SIZE - pdata_off), count); | |
232 | sg_set_page(&sg[index++], pdata[i++], s, pdata_off); | |
233 | count -= s; | |
234 | } | |
235 | ||
236 | while (count) { | |
237 | BUG_ON(index > limit); | |
238 | s = min((int)PAGE_SIZE, count); | |
239 | sg_set_page(&sg[index++], pdata[i++], s, 0); | |
240 | count -= s; | |
241 | } | |
242 | return index-start; | |
243 | } | |
244 | ||
ee443996 | 245 | /** |
91b8534f | 246 | * p9_virtio_request - issue a request |
0e15597e AK |
247 | * @client: client instance issuing the request |
248 | * @req: request to be issued | |
ee443996 EVH |
249 | * |
250 | */ | |
251 | ||
e2735b77 | 252 | static int |
91b8534f | 253 | p9_virtio_request(struct p9_client *client, struct p9_req_t *req) |
b530cc79 | 254 | { |
4038866d | 255 | int in, out, inp, outp; |
91b8534f EVH |
256 | struct virtio_chan *chan = client->trans; |
257 | char *rdata = (char *)req->rc+sizeof(struct p9_fcall); | |
419b3956 | 258 | unsigned long flags; |
4038866d VJJ |
259 | size_t pdata_off = 0; |
260 | struct trans_rpage_info *rpinfo = NULL; | |
261 | int err, pdata_len = 0; | |
b530cc79 | 262 | |
91b8534f | 263 | P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio request\n"); |
b530cc79 | 264 | |
52f44e0d | 265 | req_retry: |
419b3956 VJJ |
266 | req->status = REQ_STATUS_SENT; |
267 | ||
4038866d VJJ |
268 | if (req->tc->pbuf_size && (req->tc->pubuf && P9_IS_USER_CONTEXT)) { |
269 | int nr_pages = p9_nr_pages(req); | |
270 | int rpinfo_size = sizeof(struct trans_rpage_info) + | |
271 | sizeof(struct page *) * nr_pages; | |
272 | ||
273 | if (rpinfo_size <= (req->tc->capacity - req->tc->size)) { | |
274 | /* We can use sdata */ | |
275 | req->tc->private = req->tc->sdata + req->tc->size; | |
276 | rpinfo = (struct trans_rpage_info *)req->tc->private; | |
277 | rpinfo->rp_alloc = 0; | |
278 | } else { | |
279 | req->tc->private = kmalloc(rpinfo_size, GFP_NOFS); | |
280 | if (!req->tc->private) { | |
281 | P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: " | |
282 | "private kmalloc returned NULL"); | |
283 | return -ENOMEM; | |
284 | } | |
285 | rpinfo = (struct trans_rpage_info *)req->tc->private; | |
286 | rpinfo->rp_alloc = 1; | |
287 | } | |
288 | ||
289 | err = p9_payload_gup(req, &pdata_off, &pdata_len, nr_pages, | |
290 | req->tc->id == P9_TREAD ? 1 : 0); | |
291 | if (err < 0) { | |
292 | if (rpinfo->rp_alloc) | |
293 | kfree(rpinfo); | |
294 | return err; | |
295 | } | |
296 | } | |
297 | ||
419b3956 | 298 | spin_lock_irqsave(&chan->lock, flags); |
4038866d VJJ |
299 | |
300 | /* Handle out VirtIO ring buffers */ | |
91b8534f | 301 | out = pack_sg_list(chan->sg, 0, VIRTQUEUE_NUM, req->tc->sdata, |
4038866d VJJ |
302 | req->tc->size); |
303 | ||
304 | if (req->tc->pbuf_size && (req->tc->id == P9_TWRITE)) { | |
305 | /* We have additional write payload buffer to take care */ | |
306 | if (req->tc->pubuf && P9_IS_USER_CONTEXT) { | |
307 | outp = pack_sg_list_p(chan->sg, out, VIRTQUEUE_NUM, | |
308 | pdata_off, rpinfo->rp_data, pdata_len); | |
309 | } else { | |
310 | char *pbuf = req->tc->pubuf ? req->tc->pubuf : | |
311 | req->tc->pkbuf; | |
312 | outp = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM, pbuf, | |
313 | req->tc->pbuf_size); | |
314 | } | |
315 | out += outp; | |
316 | } | |
317 | ||
318 | /* Handle in VirtIO ring buffers */ | |
319 | if (req->tc->pbuf_size && | |
320 | ((req->tc->id == P9_TREAD) || (req->tc->id == P9_TREADDIR))) { | |
321 | /* | |
322 | * Take care of additional Read payload. | |
323 | * 11 is the read/write header = PDU Header(7) + IO Size (4). | |
324 | * Arrange in such a way that server places header in the | |
325 | * alloced memory and payload onto the user buffer. | |
326 | */ | |
327 | inp = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM, rdata, 11); | |
328 | /* | |
329 | * Running executables in the filesystem may result in | |
330 | * a read request with kernel buffer as opposed to user buffer. | |
331 | */ | |
332 | if (req->tc->pubuf && P9_IS_USER_CONTEXT) { | |
333 | in = pack_sg_list_p(chan->sg, out+inp, VIRTQUEUE_NUM, | |
334 | pdata_off, rpinfo->rp_data, pdata_len); | |
335 | } else { | |
336 | char *pbuf = req->tc->pubuf ? req->tc->pubuf : | |
337 | req->tc->pkbuf; | |
338 | in = pack_sg_list(chan->sg, out+inp, VIRTQUEUE_NUM, | |
339 | pbuf, req->tc->pbuf_size); | |
340 | } | |
341 | in += inp; | |
342 | } else { | |
343 | in = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM, rdata, | |
344 | client->msize); | |
345 | } | |
b530cc79 | 346 | |
419b3956 VJJ |
347 | err = virtqueue_add_buf(chan->vq, chan->sg, out, in, req->tc); |
348 | if (err < 0) { | |
52f44e0d VJJ |
349 | if (err == -ENOSPC) { |
350 | chan->ring_bufs_avail = 0; | |
351 | spin_unlock_irqrestore(&chan->lock, flags); | |
352 | err = wait_event_interruptible(*chan->vc_wq, | |
353 | chan->ring_bufs_avail); | |
354 | if (err == -ERESTARTSYS) | |
355 | return err; | |
356 | ||
357 | P9_DPRINTK(P9_DEBUG_TRANS, "9p:Retry virtio request\n"); | |
358 | goto req_retry; | |
359 | } else { | |
360 | spin_unlock_irqrestore(&chan->lock, flags); | |
361 | P9_DPRINTK(P9_DEBUG_TRANS, | |
362 | "9p debug: " | |
363 | "virtio rpc add_buf returned failure"); | |
4038866d VJJ |
364 | if (rpinfo && rpinfo->rp_alloc) |
365 | kfree(rpinfo); | |
52f44e0d VJJ |
366 | return -EIO; |
367 | } | |
e2735b77 | 368 | } |
b530cc79 | 369 | |
dc3f5e68 | 370 | virtqueue_kick(chan->vq); |
419b3956 | 371 | spin_unlock_irqrestore(&chan->lock, flags); |
b530cc79 | 372 | |
91b8534f | 373 | P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio request kicked\n"); |
e2735b77 | 374 | return 0; |
b530cc79 EVH |
375 | } |
376 | ||
86c84373 AK |
377 | static ssize_t p9_mount_tag_show(struct device *dev, |
378 | struct device_attribute *attr, char *buf) | |
379 | { | |
380 | struct virtio_chan *chan; | |
381 | struct virtio_device *vdev; | |
382 | ||
383 | vdev = dev_to_virtio(dev); | |
384 | chan = vdev->priv; | |
385 | ||
386 | return snprintf(buf, chan->tag_len + 1, "%s", chan->tag); | |
387 | } | |
388 | ||
389 | static DEVICE_ATTR(mount_tag, 0444, p9_mount_tag_show, NULL); | |
390 | ||
ee443996 EVH |
391 | /** |
392 | * p9_virtio_probe - probe for existence of 9P virtio channels | |
393 | * @vdev: virtio device to probe | |
394 | * | |
37c1209d | 395 | * This probes for existing virtio channels. |
ee443996 EVH |
396 | * |
397 | */ | |
398 | ||
e2735b77 | 399 | static int p9_virtio_probe(struct virtio_device *vdev) |
b530cc79 | 400 | { |
97ee9b02 AK |
401 | __u16 tag_len; |
402 | char *tag; | |
b530cc79 EVH |
403 | int err; |
404 | struct virtio_chan *chan; | |
b530cc79 | 405 | |
37c1209d AK |
406 | chan = kmalloc(sizeof(struct virtio_chan), GFP_KERNEL); |
407 | if (!chan) { | |
408 | printk(KERN_ERR "9p: Failed to allocate virtio 9P channel\n"); | |
b530cc79 EVH |
409 | err = -ENOMEM; |
410 | goto fail; | |
411 | } | |
412 | ||
e2735b77 | 413 | chan->vdev = vdev; |
b530cc79 | 414 | |
e2735b77 | 415 | /* We expect one virtqueue, for requests. */ |
d2a7ddda | 416 | chan->vq = virtio_find_single_vq(vdev, req_done, "requests"); |
e2735b77 EVH |
417 | if (IS_ERR(chan->vq)) { |
418 | err = PTR_ERR(chan->vq); | |
419 | goto out_free_vq; | |
b530cc79 | 420 | } |
e2735b77 EVH |
421 | chan->vq->vdev->priv = chan; |
422 | spin_lock_init(&chan->lock); | |
b530cc79 | 423 | |
e2735b77 | 424 | sg_init_table(chan->sg, VIRTQUEUE_NUM); |
b530cc79 | 425 | |
b530cc79 | 426 | chan->inuse = false; |
97ee9b02 AK |
427 | if (virtio_has_feature(vdev, VIRTIO_9P_MOUNT_TAG)) { |
428 | vdev->config->get(vdev, | |
429 | offsetof(struct virtio_9p_config, tag_len), | |
430 | &tag_len, sizeof(tag_len)); | |
431 | } else { | |
432 | err = -EINVAL; | |
433 | goto out_free_vq; | |
434 | } | |
435 | tag = kmalloc(tag_len, GFP_KERNEL); | |
436 | if (!tag) { | |
437 | err = -ENOMEM; | |
438 | goto out_free_vq; | |
439 | } | |
440 | vdev->config->get(vdev, offsetof(struct virtio_9p_config, tag), | |
441 | tag, tag_len); | |
442 | chan->tag = tag; | |
443 | chan->tag_len = tag_len; | |
86c84373 AK |
444 | err = sysfs_create_file(&(vdev->dev.kobj), &dev_attr_mount_tag.attr); |
445 | if (err) { | |
52f44e0d | 446 | goto out_free_tag; |
86c84373 | 447 | } |
52f44e0d VJJ |
448 | chan->vc_wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL); |
449 | if (!chan->vc_wq) { | |
450 | err = -ENOMEM; | |
451 | goto out_free_tag; | |
452 | } | |
453 | init_waitqueue_head(chan->vc_wq); | |
454 | chan->ring_bufs_avail = 1; | |
455 | ||
37c1209d AK |
456 | mutex_lock(&virtio_9p_lock); |
457 | list_add_tail(&chan->chan_list, &virtio_chan_list); | |
458 | mutex_unlock(&virtio_9p_lock); | |
b530cc79 EVH |
459 | return 0; |
460 | ||
52f44e0d VJJ |
461 | out_free_tag: |
462 | kfree(tag); | |
e2735b77 | 463 | out_free_vq: |
d2a7ddda | 464 | vdev->config->del_vqs(vdev); |
37c1209d | 465 | kfree(chan); |
b530cc79 | 466 | fail: |
b530cc79 EVH |
467 | return err; |
468 | } | |
469 | ||
ee443996 EVH |
470 | |
471 | /** | |
472 | * p9_virtio_create - allocate a new virtio channel | |
8b81ef58 | 473 | * @client: client instance invoking this transport |
ee443996 EVH |
474 | * @devname: string identifying the channel to connect to (unused) |
475 | * @args: args passed from sys_mount() for per-transport options (unused) | |
ee443996 EVH |
476 | * |
477 | * This sets up a transport channel for 9p communication. Right now | |
b530cc79 EVH |
478 | * we only match the first available channel, but eventually we couldlook up |
479 | * alternate channels by matching devname versus a virtio_config entry. | |
480 | * We use a simple reference count mechanism to ensure that only a single | |
ee443996 EVH |
481 | * mount has a channel open at a time. |
482 | * | |
ee443996 EVH |
483 | */ |
484 | ||
8b81ef58 EVH |
485 | static int |
486 | p9_virtio_create(struct p9_client *client, const char *devname, char *args) | |
b530cc79 | 487 | { |
37c1209d | 488 | struct virtio_chan *chan; |
c1a7c226 | 489 | int ret = -ENOENT; |
37c1209d | 490 | int found = 0; |
b530cc79 | 491 | |
c1549497 | 492 | mutex_lock(&virtio_9p_lock); |
37c1209d | 493 | list_for_each_entry(chan, &virtio_chan_list, chan_list) { |
0b20406c SE |
494 | if (!strncmp(devname, chan->tag, chan->tag_len) && |
495 | strlen(devname) == chan->tag_len) { | |
f75580c4 AK |
496 | if (!chan->inuse) { |
497 | chan->inuse = true; | |
37c1209d | 498 | found = 1; |
f75580c4 AK |
499 | break; |
500 | } | |
c1a7c226 | 501 | ret = -EBUSY; |
b530cc79 EVH |
502 | } |
503 | } | |
c1549497 | 504 | mutex_unlock(&virtio_9p_lock); |
b530cc79 | 505 | |
37c1209d | 506 | if (!found) { |
e2735b77 | 507 | printk(KERN_ERR "9p: no channels available\n"); |
c1a7c226 | 508 | return ret; |
e2735b77 EVH |
509 | } |
510 | ||
8b81ef58 | 511 | client->trans = (void *)chan; |
562ada61 | 512 | client->status = Connected; |
fea511a6 | 513 | chan->client = client; |
b530cc79 | 514 | |
8b81ef58 | 515 | return 0; |
b530cc79 EVH |
516 | } |
517 | ||
ee443996 EVH |
518 | /** |
519 | * p9_virtio_remove - clean up resources associated with a virtio device | |
520 | * @vdev: virtio device to remove | |
521 | * | |
522 | */ | |
523 | ||
f3933545 EVH |
524 | static void p9_virtio_remove(struct virtio_device *vdev) |
525 | { | |
526 | struct virtio_chan *chan = vdev->priv; | |
527 | ||
528 | BUG_ON(chan->inuse); | |
37c1209d AK |
529 | vdev->config->del_vqs(vdev); |
530 | ||
531 | mutex_lock(&virtio_9p_lock); | |
532 | list_del(&chan->chan_list); | |
533 | mutex_unlock(&virtio_9p_lock); | |
86c84373 | 534 | sysfs_remove_file(&(vdev->dev.kobj), &dev_attr_mount_tag.attr); |
97ee9b02 | 535 | kfree(chan->tag); |
52f44e0d | 536 | kfree(chan->vc_wq); |
37c1209d | 537 | kfree(chan); |
f3933545 | 538 | |
f3933545 EVH |
539 | } |
540 | ||
b530cc79 EVH |
541 | static struct virtio_device_id id_table[] = { |
542 | { VIRTIO_ID_9P, VIRTIO_DEV_ANY_ID }, | |
543 | { 0 }, | |
544 | }; | |
545 | ||
97ee9b02 AK |
546 | static unsigned int features[] = { |
547 | VIRTIO_9P_MOUNT_TAG, | |
548 | }; | |
549 | ||
b530cc79 EVH |
550 | /* The standard "struct lguest_driver": */ |
551 | static struct virtio_driver p9_virtio_drv = { | |
97ee9b02 AK |
552 | .feature_table = features, |
553 | .feature_table_size = ARRAY_SIZE(features), | |
554 | .driver.name = KBUILD_MODNAME, | |
555 | .driver.owner = THIS_MODULE, | |
556 | .id_table = id_table, | |
557 | .probe = p9_virtio_probe, | |
558 | .remove = p9_virtio_remove, | |
b530cc79 EVH |
559 | }; |
560 | ||
561 | static struct p9_trans_module p9_virtio_trans = { | |
562 | .name = "virtio", | |
563 | .create = p9_virtio_create, | |
8b81ef58 | 564 | .close = p9_virtio_close, |
91b8534f EVH |
565 | .request = p9_virtio_request, |
566 | .cancel = p9_virtio_cancel, | |
e2735b77 | 567 | .maxsize = PAGE_SIZE*16, |
6f69c395 | 568 | .pref = P9_TRANS_PREF_PAYLOAD_SEP, |
b530cc79 | 569 | .def = 0, |
72029fe8 | 570 | .owner = THIS_MODULE, |
b530cc79 EVH |
571 | }; |
572 | ||
573 | /* The standard init function */ | |
574 | static int __init p9_virtio_init(void) | |
575 | { | |
37c1209d | 576 | INIT_LIST_HEAD(&virtio_chan_list); |
b530cc79 EVH |
577 | |
578 | v9fs_register_trans(&p9_virtio_trans); | |
579 | return register_virtio_driver(&p9_virtio_drv); | |
580 | } | |
581 | ||
f3933545 EVH |
582 | static void __exit p9_virtio_cleanup(void) |
583 | { | |
584 | unregister_virtio_driver(&p9_virtio_drv); | |
72029fe8 | 585 | v9fs_unregister_trans(&p9_virtio_trans); |
f3933545 EVH |
586 | } |
587 | ||
b530cc79 | 588 | module_init(p9_virtio_init); |
f3933545 | 589 | module_exit(p9_virtio_cleanup); |
b530cc79 EVH |
590 | |
591 | MODULE_DEVICE_TABLE(virtio, id_table); | |
592 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); | |
593 | MODULE_DESCRIPTION("Virtio 9p Transport"); | |
594 | MODULE_LICENSE("GPL"); |