Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 1 | /* |
Eric Van Hensbergen | fea511a | 2008-10-13 18:45:23 -0500 | [diff] [blame] | 2 | * The Virtio 9p transport driver |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 3 | * |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 4 | * This is a block based transport driver based on the lguest block driver |
| 5 | * code. |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 6 | * |
Eric Van Hensbergen | fea511a | 2008-10-13 18:45:23 -0500 | [diff] [blame] | 7 | * Copyright (C) 2007, 2008 Eric Van Hensbergen, IBM Corporation |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 40 | #include <linux/slab.h> |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 41 | #include <net/9p/9p.h> |
| 42 | #include <linux/parser.h> |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 43 | #include <net/9p/client.h> |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 44 | #include <net/9p/transport.h> |
| 45 | #include <linux/scatterlist.h> |
Venkateswararao Jujjuri (JV) | 68da9ba | 2011-03-18 15:49:48 -0700 | [diff] [blame] | 46 | #include <linux/swap.h> |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 47 | #include <linux/virtio.h> |
| 48 | #include <linux/virtio_9p.h> |
Venkateswararao Jujjuri (JV) | 4038866 | 2011-01-28 15:22:36 -0800 | [diff] [blame] | 49 | #include "trans_common.h" |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 50 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 51 | #define VIRTQUEUE_NUM 128 |
| 52 | |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 53 | /* a single mutex to manage channel initialization and attachment */ |
Josef 'Jeff' Sipek | c154949 | 2008-03-07 11:39:13 -0600 | [diff] [blame] | 54 | static DEFINE_MUTEX(virtio_9p_lock); |
Venkateswararao Jujjuri (JV) | 68da9ba | 2011-03-18 15:49:48 -0700 | [diff] [blame] | 55 | static DECLARE_WAIT_QUEUE_HEAD(vp_wq); |
| 56 | static atomic_t vp_pinned = ATOMIC_INIT(0); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 57 | |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 58 | /** |
| 59 | * struct virtio_chan - per-instance transport information |
| 60 | * @initialized: whether the channel is initialized |
| 61 | * @inuse: whether the channel is in use |
| 62 | * @lock: protects multiple elements within this structure |
Abhishek Kulkarni | 0e15597 | 2009-07-19 13:41:55 -0600 | [diff] [blame] | 63 | * @client: client instance |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 64 | * @vdev: virtio dev associated with this channel |
| 65 | * @vq: virtio queue associated with this channel |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 66 | * @sg: scatter gather list which is used to pack a request (protected?) |
| 67 | * |
| 68 | * We keep all per-channel information in a structure. |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 69 | * This structure is allocated within the devices dev->mem space. |
| 70 | * A pointer to the structure will get put in the transport private. |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 71 | * |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 72 | */ |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 73 | |
Aneesh Kumar K.V | 37c1209d4 | 2010-02-15 17:27:01 +0000 | [diff] [blame] | 74 | struct virtio_chan { |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 75 | bool inuse; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 76 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 77 | spinlock_t lock; |
| 78 | |
Eric Van Hensbergen | fea511a | 2008-10-13 18:45:23 -0500 | [diff] [blame] | 79 | struct p9_client *client; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 80 | struct virtio_device *vdev; |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 81 | struct virtqueue *vq; |
Venkateswararao Jujjuri (JV) | 52f44e0 | 2010-09-29 18:33:41 -0700 | [diff] [blame] | 82 | int ring_bufs_avail; |
| 83 | wait_queue_head_t *vc_wq; |
Venkateswararao Jujjuri (JV) | 68da9ba | 2011-03-18 15:49:48 -0700 | [diff] [blame] | 84 | /* This is global limit. Since we don't have a global structure, |
| 85 | * will be placing it in each channel. |
| 86 | */ |
| 87 | int p9_max_pages; |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 88 | /* Scatterlist: can be too big for stack. */ |
| 89 | struct scatterlist sg[VIRTQUEUE_NUM]; |
Aneesh Kumar K.V | 37c1209d4 | 2010-02-15 17:27:01 +0000 | [diff] [blame] | 90 | |
Aneesh Kumar K.V | 97ee9b0 | 2010-03-06 04:44:14 +0000 | [diff] [blame] | 91 | int tag_len; |
| 92 | /* |
| 93 | * tag name to identify a mount Non-null terminated |
| 94 | */ |
| 95 | char *tag; |
| 96 | |
Aneesh Kumar K.V | 37c1209d4 | 2010-02-15 17:27:01 +0000 | [diff] [blame] | 97 | struct list_head chan_list; |
| 98 | }; |
| 99 | |
| 100 | static struct list_head virtio_chan_list; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 101 | |
| 102 | /* How many bytes left in this page. */ |
| 103 | static unsigned int rest_of_page(void *data) |
| 104 | { |
| 105 | return PAGE_SIZE - ((unsigned long)data % PAGE_SIZE); |
| 106 | } |
| 107 | |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 108 | /** |
| 109 | * p9_virtio_close - reclaim resources of a channel |
Abhishek Kulkarni | 0e15597 | 2009-07-19 13:41:55 -0600 | [diff] [blame] | 110 | * @client: client instance |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 111 | * |
| 112 | * This reclaims a channel by freeing its resources and |
| 113 | * reseting its inuse flag. |
| 114 | * |
| 115 | */ |
| 116 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 117 | static void p9_virtio_close(struct p9_client *client) |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 118 | { |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 119 | struct virtio_chan *chan = client->trans; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 120 | |
Josef 'Jeff' Sipek | c154949 | 2008-03-07 11:39:13 -0600 | [diff] [blame] | 121 | mutex_lock(&virtio_9p_lock); |
Aneesh Kumar K.V | fb78610 | 2010-02-08 11:50:32 +0000 | [diff] [blame] | 122 | if (chan) |
| 123 | chan->inuse = false; |
Josef 'Jeff' Sipek | c154949 | 2008-03-07 11:39:13 -0600 | [diff] [blame] | 124 | mutex_unlock(&virtio_9p_lock); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 125 | } |
| 126 | |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 127 | /** |
| 128 | * req_done - callback which signals activity from the server |
| 129 | * @vq: virtio queue activity was received on |
| 130 | * |
| 131 | * This notifies us that the server has triggered some activity |
| 132 | * on the virtio channel - most likely a response to request we |
| 133 | * sent. Figure out which requests now have responses and wake up |
| 134 | * those threads. |
| 135 | * |
| 136 | * Bugs: could do with some additional sanity checking, but appears to work. |
| 137 | * |
| 138 | */ |
| 139 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 140 | static void req_done(struct virtqueue *vq) |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 141 | { |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 142 | struct virtio_chan *chan = vq->vdev->priv; |
| 143 | struct p9_fcall *rc; |
| 144 | unsigned int len; |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 145 | struct p9_req_t *req; |
Venkateswararao Jujjuri (JV) | 419b395 | 2010-09-29 18:06:54 -0700 | [diff] [blame] | 146 | unsigned long flags; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 147 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 148 | P9_DPRINTK(P9_DEBUG_TRANS, ": request done\n"); |
| 149 | |
Venkateswararao Jujjuri (JV) | a01a984 | 2011-03-14 14:12:49 -0700 | [diff] [blame] | 150 | while (1) { |
Venkateswararao Jujjuri (JV) | 419b395 | 2010-09-29 18:06:54 -0700 | [diff] [blame] | 151 | spin_lock_irqsave(&chan->lock, flags); |
| 152 | rc = virtqueue_get_buf(chan->vq, &len); |
Venkateswararao Jujjuri (JV) | 419b395 | 2010-09-29 18:06:54 -0700 | [diff] [blame] | 153 | |
Venkateswararao Jujjuri (JV) | a01a984 | 2011-03-14 14:12:49 -0700 | [diff] [blame] | 154 | if (rc == NULL) { |
Venkateswararao Jujjuri (JV) | 52f44e0 | 2010-09-29 18:33:41 -0700 | [diff] [blame] | 155 | spin_unlock_irqrestore(&chan->lock, flags); |
Venkateswararao Jujjuri (JV) | a01a984 | 2011-03-14 14:12:49 -0700 | [diff] [blame] | 156 | break; |
Venkateswararao Jujjuri (JV) | 419b395 | 2010-09-29 18:06:54 -0700 | [diff] [blame] | 157 | } |
Venkateswararao Jujjuri (JV) | a01a984 | 2011-03-14 14:12:49 -0700 | [diff] [blame] | 158 | |
| 159 | chan->ring_bufs_avail = 1; |
| 160 | spin_unlock_irqrestore(&chan->lock, flags); |
| 161 | /* Wakeup if anyone waiting for VirtIO ring space. */ |
| 162 | wake_up(chan->vc_wq); |
| 163 | P9_DPRINTK(P9_DEBUG_TRANS, ": rc %p\n", rc); |
| 164 | P9_DPRINTK(P9_DEBUG_TRANS, ": lookup tag %d\n", rc->tag); |
| 165 | req = p9_tag_lookup(chan->client, rc->tag); |
| 166 | if (req->tc->private) { |
| 167 | struct trans_rpage_info *rp = req->tc->private; |
Venkateswararao Jujjuri (JV) | 68da9ba | 2011-03-18 15:49:48 -0700 | [diff] [blame] | 168 | int p = rp->rp_nr_pages; |
Venkateswararao Jujjuri (JV) | a01a984 | 2011-03-14 14:12:49 -0700 | [diff] [blame] | 169 | /*Release pages */ |
| 170 | p9_release_req_pages(rp); |
Venkateswararao Jujjuri (JV) | 68da9ba | 2011-03-18 15:49:48 -0700 | [diff] [blame] | 171 | atomic_sub(p, &vp_pinned); |
| 172 | wake_up(&vp_wq); |
Venkateswararao Jujjuri (JV) | a01a984 | 2011-03-14 14:12:49 -0700 | [diff] [blame] | 173 | if (rp->rp_alloc) |
| 174 | kfree(rp); |
| 175 | req->tc->private = NULL; |
| 176 | } |
| 177 | req->status = REQ_STATUS_RCVD; |
| 178 | p9_client_cb(chan->client, req); |
| 179 | } |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 180 | } |
| 181 | |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 182 | /** |
| 183 | * pack_sg_list - pack a scatter gather list from a linear buffer |
| 184 | * @sg: scatter/gather list to pack into |
| 185 | * @start: which segment of the sg_list to start at |
| 186 | * @limit: maximum segment to pack data to |
| 187 | * @data: data to pack into scatter/gather list |
| 188 | * @count: amount of data to pack into the scatter/gather list |
| 189 | * |
| 190 | * sg_lists have multiple segments of various sizes. This will pack |
| 191 | * arbitrary data into an existing scatter gather list, segmenting the |
| 192 | * data as necessary within constraints. |
| 193 | * |
| 194 | */ |
| 195 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 196 | static int |
| 197 | pack_sg_list(struct scatterlist *sg, int start, int limit, char *data, |
| 198 | int count) |
| 199 | { |
| 200 | int s; |
| 201 | int index = start; |
| 202 | |
| 203 | while (count) { |
| 204 | s = rest_of_page(data); |
| 205 | if (s > count) |
| 206 | s = count; |
| 207 | sg_set_buf(&sg[index++], data, s); |
| 208 | count -= s; |
| 209 | data += s; |
Julia Lawall | d6584f3 | 2008-02-17 18:42:53 -0800 | [diff] [blame] | 210 | BUG_ON(index > limit); |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 211 | } |
| 212 | |
| 213 | return index-start; |
| 214 | } |
| 215 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 216 | /* We don't currently allow canceling of virtio requests */ |
| 217 | static int p9_virtio_cancel(struct p9_client *client, struct p9_req_t *req) |
| 218 | { |
| 219 | return 1; |
| 220 | } |
| 221 | |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 222 | /** |
Venkateswararao Jujjuri (JV) | 4038866 | 2011-01-28 15:22:36 -0800 | [diff] [blame] | 223 | * pack_sg_list_p - Just like pack_sg_list. Instead of taking a buffer, |
| 224 | * this takes a list of pages. |
| 225 | * @sg: scatter/gather list to pack into |
| 226 | * @start: which segment of the sg_list to start at |
| 227 | * @pdata_off: Offset into the first page |
| 228 | * @**pdata: a list of pages to add into sg. |
| 229 | * @count: amount of data to pack into the scatter/gather list |
| 230 | */ |
| 231 | static int |
| 232 | pack_sg_list_p(struct scatterlist *sg, int start, int limit, size_t pdata_off, |
| 233 | struct page **pdata, int count) |
| 234 | { |
| 235 | int s; |
| 236 | int i = 0; |
| 237 | int index = start; |
| 238 | |
| 239 | if (pdata_off) { |
| 240 | s = min((int)(PAGE_SIZE - pdata_off), count); |
| 241 | sg_set_page(&sg[index++], pdata[i++], s, pdata_off); |
| 242 | count -= s; |
| 243 | } |
| 244 | |
| 245 | while (count) { |
| 246 | BUG_ON(index > limit); |
| 247 | s = min((int)PAGE_SIZE, count); |
| 248 | sg_set_page(&sg[index++], pdata[i++], s, 0); |
| 249 | count -= s; |
| 250 | } |
| 251 | return index-start; |
| 252 | } |
| 253 | |
| 254 | /** |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 255 | * p9_virtio_request - issue a request |
Abhishek Kulkarni | 0e15597 | 2009-07-19 13:41:55 -0600 | [diff] [blame] | 256 | * @client: client instance issuing the request |
| 257 | * @req: request to be issued |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 258 | * |
| 259 | */ |
| 260 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 261 | static int |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 262 | p9_virtio_request(struct p9_client *client, struct p9_req_t *req) |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 263 | { |
Venkateswararao Jujjuri (JV) | 4038866 | 2011-01-28 15:22:36 -0800 | [diff] [blame] | 264 | int in, out, inp, outp; |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 265 | struct virtio_chan *chan = client->trans; |
| 266 | char *rdata = (char *)req->rc+sizeof(struct p9_fcall); |
Venkateswararao Jujjuri (JV) | 419b395 | 2010-09-29 18:06:54 -0700 | [diff] [blame] | 267 | unsigned long flags; |
Venkateswararao Jujjuri (JV) | 4038866 | 2011-01-28 15:22:36 -0800 | [diff] [blame] | 268 | size_t pdata_off = 0; |
| 269 | struct trans_rpage_info *rpinfo = NULL; |
| 270 | int err, pdata_len = 0; |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 271 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 272 | P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio request\n"); |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 273 | |
Venkateswararao Jujjuri (JV) | 419b395 | 2010-09-29 18:06:54 -0700 | [diff] [blame] | 274 | req->status = REQ_STATUS_SENT; |
| 275 | |
Venkateswararao Jujjuri (JV) | 4038866 | 2011-01-28 15:22:36 -0800 | [diff] [blame] | 276 | if (req->tc->pbuf_size && (req->tc->pubuf && P9_IS_USER_CONTEXT)) { |
| 277 | int nr_pages = p9_nr_pages(req); |
| 278 | int rpinfo_size = sizeof(struct trans_rpage_info) + |
| 279 | sizeof(struct page *) * nr_pages; |
| 280 | |
Venkateswararao Jujjuri (JV) | 68da9ba | 2011-03-18 15:49:48 -0700 | [diff] [blame] | 281 | if (atomic_read(&vp_pinned) >= chan->p9_max_pages) { |
| 282 | err = wait_event_interruptible(vp_wq, |
| 283 | atomic_read(&vp_pinned) < chan->p9_max_pages); |
| 284 | if (err == -ERESTARTSYS) |
| 285 | return err; |
| 286 | P9_DPRINTK(P9_DEBUG_TRANS, "9p: May gup pages now.\n"); |
| 287 | } |
| 288 | |
Venkateswararao Jujjuri (JV) | 4038866 | 2011-01-28 15:22:36 -0800 | [diff] [blame] | 289 | if (rpinfo_size <= (req->tc->capacity - req->tc->size)) { |
| 290 | /* We can use sdata */ |
| 291 | req->tc->private = req->tc->sdata + req->tc->size; |
| 292 | rpinfo = (struct trans_rpage_info *)req->tc->private; |
| 293 | rpinfo->rp_alloc = 0; |
| 294 | } else { |
| 295 | req->tc->private = kmalloc(rpinfo_size, GFP_NOFS); |
| 296 | if (!req->tc->private) { |
| 297 | P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: " |
| 298 | "private kmalloc returned NULL"); |
| 299 | return -ENOMEM; |
| 300 | } |
| 301 | rpinfo = (struct trans_rpage_info *)req->tc->private; |
| 302 | rpinfo->rp_alloc = 1; |
| 303 | } |
| 304 | |
| 305 | err = p9_payload_gup(req, &pdata_off, &pdata_len, nr_pages, |
| 306 | req->tc->id == P9_TREAD ? 1 : 0); |
| 307 | if (err < 0) { |
| 308 | if (rpinfo->rp_alloc) |
| 309 | kfree(rpinfo); |
| 310 | return err; |
Venkateswararao Jujjuri (JV) | 68da9ba | 2011-03-18 15:49:48 -0700 | [diff] [blame] | 311 | } else { |
| 312 | atomic_add(rpinfo->rp_nr_pages, &vp_pinned); |
Venkateswararao Jujjuri (JV) | 4038866 | 2011-01-28 15:22:36 -0800 | [diff] [blame] | 313 | } |
| 314 | } |
| 315 | |
Venkateswararao Jujjuri (JV) | 316ad55 | 2011-03-14 14:22:41 -0700 | [diff] [blame] | 316 | req_retry_pinned: |
Venkateswararao Jujjuri (JV) | 419b395 | 2010-09-29 18:06:54 -0700 | [diff] [blame] | 317 | spin_lock_irqsave(&chan->lock, flags); |
Venkateswararao Jujjuri (JV) | 4038866 | 2011-01-28 15:22:36 -0800 | [diff] [blame] | 318 | |
| 319 | /* Handle out VirtIO ring buffers */ |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 320 | out = pack_sg_list(chan->sg, 0, VIRTQUEUE_NUM, req->tc->sdata, |
Venkateswararao Jujjuri (JV) | 4038866 | 2011-01-28 15:22:36 -0800 | [diff] [blame] | 321 | req->tc->size); |
| 322 | |
| 323 | if (req->tc->pbuf_size && (req->tc->id == P9_TWRITE)) { |
| 324 | /* We have additional write payload buffer to take care */ |
| 325 | if (req->tc->pubuf && P9_IS_USER_CONTEXT) { |
| 326 | outp = pack_sg_list_p(chan->sg, out, VIRTQUEUE_NUM, |
| 327 | pdata_off, rpinfo->rp_data, pdata_len); |
| 328 | } else { |
| 329 | char *pbuf = req->tc->pubuf ? req->tc->pubuf : |
| 330 | req->tc->pkbuf; |
| 331 | outp = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM, pbuf, |
| 332 | req->tc->pbuf_size); |
| 333 | } |
| 334 | out += outp; |
| 335 | } |
| 336 | |
| 337 | /* Handle in VirtIO ring buffers */ |
| 338 | if (req->tc->pbuf_size && |
| 339 | ((req->tc->id == P9_TREAD) || (req->tc->id == P9_TREADDIR))) { |
| 340 | /* |
| 341 | * Take care of additional Read payload. |
| 342 | * 11 is the read/write header = PDU Header(7) + IO Size (4). |
| 343 | * Arrange in such a way that server places header in the |
| 344 | * alloced memory and payload onto the user buffer. |
| 345 | */ |
| 346 | inp = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM, rdata, 11); |
| 347 | /* |
| 348 | * Running executables in the filesystem may result in |
| 349 | * a read request with kernel buffer as opposed to user buffer. |
| 350 | */ |
| 351 | if (req->tc->pubuf && P9_IS_USER_CONTEXT) { |
| 352 | in = pack_sg_list_p(chan->sg, out+inp, VIRTQUEUE_NUM, |
| 353 | pdata_off, rpinfo->rp_data, pdata_len); |
| 354 | } else { |
| 355 | char *pbuf = req->tc->pubuf ? req->tc->pubuf : |
| 356 | req->tc->pkbuf; |
| 357 | in = pack_sg_list(chan->sg, out+inp, VIRTQUEUE_NUM, |
| 358 | pbuf, req->tc->pbuf_size); |
| 359 | } |
| 360 | in += inp; |
| 361 | } else { |
| 362 | in = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM, rdata, |
| 363 | client->msize); |
| 364 | } |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 365 | |
Venkateswararao Jujjuri (JV) | 419b395 | 2010-09-29 18:06:54 -0700 | [diff] [blame] | 366 | err = virtqueue_add_buf(chan->vq, chan->sg, out, in, req->tc); |
| 367 | if (err < 0) { |
Venkateswararao Jujjuri (JV) | 52f44e0 | 2010-09-29 18:33:41 -0700 | [diff] [blame] | 368 | if (err == -ENOSPC) { |
| 369 | chan->ring_bufs_avail = 0; |
| 370 | spin_unlock_irqrestore(&chan->lock, flags); |
| 371 | err = wait_event_interruptible(*chan->vc_wq, |
| 372 | chan->ring_bufs_avail); |
| 373 | if (err == -ERESTARTSYS) |
| 374 | return err; |
| 375 | |
| 376 | P9_DPRINTK(P9_DEBUG_TRANS, "9p:Retry virtio request\n"); |
Venkateswararao Jujjuri (JV) | 316ad55 | 2011-03-14 14:22:41 -0700 | [diff] [blame] | 377 | goto req_retry_pinned; |
Venkateswararao Jujjuri (JV) | 52f44e0 | 2010-09-29 18:33:41 -0700 | [diff] [blame] | 378 | } else { |
| 379 | spin_unlock_irqrestore(&chan->lock, flags); |
| 380 | P9_DPRINTK(P9_DEBUG_TRANS, |
| 381 | "9p debug: " |
| 382 | "virtio rpc add_buf returned failure"); |
Venkateswararao Jujjuri (JV) | 4038866 | 2011-01-28 15:22:36 -0800 | [diff] [blame] | 383 | if (rpinfo && rpinfo->rp_alloc) |
| 384 | kfree(rpinfo); |
Venkateswararao Jujjuri (JV) | 52f44e0 | 2010-09-29 18:33:41 -0700 | [diff] [blame] | 385 | return -EIO; |
| 386 | } |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 387 | } |
| 388 | |
Michael S. Tsirkin | dc3f5e6 | 2010-04-13 16:11:50 +0300 | [diff] [blame] | 389 | virtqueue_kick(chan->vq); |
Venkateswararao Jujjuri (JV) | 419b395 | 2010-09-29 18:06:54 -0700 | [diff] [blame] | 390 | spin_unlock_irqrestore(&chan->lock, flags); |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 391 | |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 392 | P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio request kicked\n"); |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 393 | return 0; |
| 394 | } |
| 395 | |
Aneesh Kumar K.V | 86c8437 | 2010-03-06 04:44:15 +0000 | [diff] [blame] | 396 | static ssize_t p9_mount_tag_show(struct device *dev, |
| 397 | struct device_attribute *attr, char *buf) |
| 398 | { |
| 399 | struct virtio_chan *chan; |
| 400 | struct virtio_device *vdev; |
| 401 | |
| 402 | vdev = dev_to_virtio(dev); |
| 403 | chan = vdev->priv; |
| 404 | |
| 405 | return snprintf(buf, chan->tag_len + 1, "%s", chan->tag); |
| 406 | } |
| 407 | |
| 408 | static DEVICE_ATTR(mount_tag, 0444, p9_mount_tag_show, NULL); |
| 409 | |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 410 | /** |
| 411 | * p9_virtio_probe - probe for existence of 9P virtio channels |
| 412 | * @vdev: virtio device to probe |
| 413 | * |
Aneesh Kumar K.V | 37c1209d4 | 2010-02-15 17:27:01 +0000 | [diff] [blame] | 414 | * This probes for existing virtio channels. |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 415 | * |
| 416 | */ |
| 417 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 418 | static int p9_virtio_probe(struct virtio_device *vdev) |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 419 | { |
Aneesh Kumar K.V | 97ee9b0 | 2010-03-06 04:44:14 +0000 | [diff] [blame] | 420 | __u16 tag_len; |
| 421 | char *tag; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 422 | int err; |
| 423 | struct virtio_chan *chan; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 424 | |
Aneesh Kumar K.V | 37c1209d4 | 2010-02-15 17:27:01 +0000 | [diff] [blame] | 425 | chan = kmalloc(sizeof(struct virtio_chan), GFP_KERNEL); |
| 426 | if (!chan) { |
| 427 | printk(KERN_ERR "9p: Failed to allocate virtio 9P channel\n"); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 428 | err = -ENOMEM; |
| 429 | goto fail; |
| 430 | } |
| 431 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 432 | chan->vdev = vdev; |
| 433 | |
| 434 | /* We expect one virtqueue, for requests. */ |
Michael S. Tsirkin | d2a7ddd | 2009-06-12 22:16:36 -0600 | [diff] [blame] | 435 | chan->vq = virtio_find_single_vq(vdev, req_done, "requests"); |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 436 | if (IS_ERR(chan->vq)) { |
| 437 | err = PTR_ERR(chan->vq); |
| 438 | goto out_free_vq; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 439 | } |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 440 | chan->vq->vdev->priv = chan; |
| 441 | spin_lock_init(&chan->lock); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 442 | |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 443 | sg_init_table(chan->sg, VIRTQUEUE_NUM); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 444 | |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 445 | chan->inuse = false; |
Aneesh Kumar K.V | 97ee9b0 | 2010-03-06 04:44:14 +0000 | [diff] [blame] | 446 | if (virtio_has_feature(vdev, VIRTIO_9P_MOUNT_TAG)) { |
| 447 | vdev->config->get(vdev, |
| 448 | offsetof(struct virtio_9p_config, tag_len), |
| 449 | &tag_len, sizeof(tag_len)); |
| 450 | } else { |
| 451 | err = -EINVAL; |
| 452 | goto out_free_vq; |
| 453 | } |
| 454 | tag = kmalloc(tag_len, GFP_KERNEL); |
| 455 | if (!tag) { |
| 456 | err = -ENOMEM; |
| 457 | goto out_free_vq; |
| 458 | } |
| 459 | vdev->config->get(vdev, offsetof(struct virtio_9p_config, tag), |
| 460 | tag, tag_len); |
| 461 | chan->tag = tag; |
| 462 | chan->tag_len = tag_len; |
Aneesh Kumar K.V | 86c8437 | 2010-03-06 04:44:15 +0000 | [diff] [blame] | 463 | err = sysfs_create_file(&(vdev->dev.kobj), &dev_attr_mount_tag.attr); |
| 464 | if (err) { |
Venkateswararao Jujjuri (JV) | 52f44e0 | 2010-09-29 18:33:41 -0700 | [diff] [blame] | 465 | goto out_free_tag; |
Aneesh Kumar K.V | 86c8437 | 2010-03-06 04:44:15 +0000 | [diff] [blame] | 466 | } |
Venkateswararao Jujjuri (JV) | 52f44e0 | 2010-09-29 18:33:41 -0700 | [diff] [blame] | 467 | chan->vc_wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL); |
| 468 | if (!chan->vc_wq) { |
| 469 | err = -ENOMEM; |
| 470 | goto out_free_tag; |
| 471 | } |
| 472 | init_waitqueue_head(chan->vc_wq); |
| 473 | chan->ring_bufs_avail = 1; |
Venkateswararao Jujjuri (JV) | 68da9ba | 2011-03-18 15:49:48 -0700 | [diff] [blame] | 474 | /* Ceiling limit to avoid denial of service attacks */ |
| 475 | chan->p9_max_pages = nr_free_buffer_pages()/4; |
Venkateswararao Jujjuri (JV) | 52f44e0 | 2010-09-29 18:33:41 -0700 | [diff] [blame] | 476 | |
Aneesh Kumar K.V | 37c1209d4 | 2010-02-15 17:27:01 +0000 | [diff] [blame] | 477 | mutex_lock(&virtio_9p_lock); |
| 478 | list_add_tail(&chan->chan_list, &virtio_chan_list); |
| 479 | mutex_unlock(&virtio_9p_lock); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 480 | return 0; |
| 481 | |
Venkateswararao Jujjuri (JV) | 52f44e0 | 2010-09-29 18:33:41 -0700 | [diff] [blame] | 482 | out_free_tag: |
| 483 | kfree(tag); |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 484 | out_free_vq: |
Michael S. Tsirkin | d2a7ddd | 2009-06-12 22:16:36 -0600 | [diff] [blame] | 485 | vdev->config->del_vqs(vdev); |
Aneesh Kumar K.V | 37c1209d4 | 2010-02-15 17:27:01 +0000 | [diff] [blame] | 486 | kfree(chan); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 487 | fail: |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 488 | return err; |
| 489 | } |
| 490 | |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 491 | |
| 492 | /** |
| 493 | * p9_virtio_create - allocate a new virtio channel |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 494 | * @client: client instance invoking this transport |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 495 | * @devname: string identifying the channel to connect to (unused) |
| 496 | * @args: args passed from sys_mount() for per-transport options (unused) |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 497 | * |
| 498 | * This sets up a transport channel for 9p communication. Right now |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 499 | * we only match the first available channel, but eventually we couldlook up |
| 500 | * alternate channels by matching devname versus a virtio_config entry. |
| 501 | * We use a simple reference count mechanism to ensure that only a single |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 502 | * mount has a channel open at a time. |
| 503 | * |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 504 | */ |
| 505 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 506 | static int |
| 507 | p9_virtio_create(struct p9_client *client, const char *devname, char *args) |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 508 | { |
Aneesh Kumar K.V | 37c1209d4 | 2010-02-15 17:27:01 +0000 | [diff] [blame] | 509 | struct virtio_chan *chan; |
Aneesh Kumar K.V | c1a7c22 | 2010-02-15 17:27:02 +0000 | [diff] [blame] | 510 | int ret = -ENOENT; |
Aneesh Kumar K.V | 37c1209d4 | 2010-02-15 17:27:01 +0000 | [diff] [blame] | 511 | int found = 0; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 512 | |
Josef 'Jeff' Sipek | c154949 | 2008-03-07 11:39:13 -0600 | [diff] [blame] | 513 | mutex_lock(&virtio_9p_lock); |
Aneesh Kumar K.V | 37c1209d4 | 2010-02-15 17:27:01 +0000 | [diff] [blame] | 514 | list_for_each_entry(chan, &virtio_chan_list, chan_list) { |
Sven Eckelmann | 0b20406 | 2010-09-27 15:54:44 -0700 | [diff] [blame] | 515 | if (!strncmp(devname, chan->tag, chan->tag_len) && |
| 516 | strlen(devname) == chan->tag_len) { |
Aneesh Kumar K.V | f75580c | 2010-02-15 17:27:00 +0000 | [diff] [blame] | 517 | if (!chan->inuse) { |
| 518 | chan->inuse = true; |
Aneesh Kumar K.V | 37c1209d4 | 2010-02-15 17:27:01 +0000 | [diff] [blame] | 519 | found = 1; |
Aneesh Kumar K.V | f75580c | 2010-02-15 17:27:00 +0000 | [diff] [blame] | 520 | break; |
| 521 | } |
Aneesh Kumar K.V | c1a7c22 | 2010-02-15 17:27:02 +0000 | [diff] [blame] | 522 | ret = -EBUSY; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 523 | } |
| 524 | } |
Josef 'Jeff' Sipek | c154949 | 2008-03-07 11:39:13 -0600 | [diff] [blame] | 525 | mutex_unlock(&virtio_9p_lock); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 526 | |
Aneesh Kumar K.V | 37c1209d4 | 2010-02-15 17:27:01 +0000 | [diff] [blame] | 527 | if (!found) { |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 528 | printk(KERN_ERR "9p: no channels available\n"); |
Aneesh Kumar K.V | c1a7c22 | 2010-02-15 17:27:02 +0000 | [diff] [blame] | 529 | return ret; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 530 | } |
| 531 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 532 | client->trans = (void *)chan; |
Eric Van Hensbergen | 562ada6 | 2010-01-15 18:54:03 -0600 | [diff] [blame] | 533 | client->status = Connected; |
Eric Van Hensbergen | fea511a | 2008-10-13 18:45:23 -0500 | [diff] [blame] | 534 | chan->client = client; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 535 | |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 536 | return 0; |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 537 | } |
| 538 | |
Eric Van Hensbergen | ee44399 | 2008-03-05 07:08:09 -0600 | [diff] [blame] | 539 | /** |
| 540 | * p9_virtio_remove - clean up resources associated with a virtio device |
| 541 | * @vdev: virtio device to remove |
| 542 | * |
| 543 | */ |
| 544 | |
Eric Van Hensbergen | f393354 | 2008-02-06 19:25:04 -0600 | [diff] [blame] | 545 | static void p9_virtio_remove(struct virtio_device *vdev) |
| 546 | { |
| 547 | struct virtio_chan *chan = vdev->priv; |
| 548 | |
| 549 | BUG_ON(chan->inuse); |
Aneesh Kumar K.V | 37c1209d4 | 2010-02-15 17:27:01 +0000 | [diff] [blame] | 550 | vdev->config->del_vqs(vdev); |
Eric Van Hensbergen | f393354 | 2008-02-06 19:25:04 -0600 | [diff] [blame] | 551 | |
Aneesh Kumar K.V | 37c1209d4 | 2010-02-15 17:27:01 +0000 | [diff] [blame] | 552 | mutex_lock(&virtio_9p_lock); |
| 553 | list_del(&chan->chan_list); |
| 554 | mutex_unlock(&virtio_9p_lock); |
Aneesh Kumar K.V | 86c8437 | 2010-03-06 04:44:15 +0000 | [diff] [blame] | 555 | sysfs_remove_file(&(vdev->dev.kobj), &dev_attr_mount_tag.attr); |
Aneesh Kumar K.V | 97ee9b0 | 2010-03-06 04:44:14 +0000 | [diff] [blame] | 556 | kfree(chan->tag); |
Venkateswararao Jujjuri (JV) | 52f44e0 | 2010-09-29 18:33:41 -0700 | [diff] [blame] | 557 | kfree(chan->vc_wq); |
Aneesh Kumar K.V | 37c1209d4 | 2010-02-15 17:27:01 +0000 | [diff] [blame] | 558 | kfree(chan); |
| 559 | |
Eric Van Hensbergen | f393354 | 2008-02-06 19:25:04 -0600 | [diff] [blame] | 560 | } |
| 561 | |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 562 | static struct virtio_device_id id_table[] = { |
| 563 | { VIRTIO_ID_9P, VIRTIO_DEV_ANY_ID }, |
| 564 | { 0 }, |
| 565 | }; |
| 566 | |
Aneesh Kumar K.V | 97ee9b0 | 2010-03-06 04:44:14 +0000 | [diff] [blame] | 567 | static unsigned int features[] = { |
| 568 | VIRTIO_9P_MOUNT_TAG, |
| 569 | }; |
| 570 | |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 571 | /* The standard "struct lguest_driver": */ |
| 572 | static struct virtio_driver p9_virtio_drv = { |
Aneesh Kumar K.V | 97ee9b0 | 2010-03-06 04:44:14 +0000 | [diff] [blame] | 573 | .feature_table = features, |
| 574 | .feature_table_size = ARRAY_SIZE(features), |
| 575 | .driver.name = KBUILD_MODNAME, |
| 576 | .driver.owner = THIS_MODULE, |
| 577 | .id_table = id_table, |
| 578 | .probe = p9_virtio_probe, |
| 579 | .remove = p9_virtio_remove, |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 580 | }; |
| 581 | |
| 582 | static struct p9_trans_module p9_virtio_trans = { |
| 583 | .name = "virtio", |
| 584 | .create = p9_virtio_create, |
Eric Van Hensbergen | 8b81ef5 | 2008-10-13 18:45:25 -0500 | [diff] [blame] | 585 | .close = p9_virtio_close, |
Eric Van Hensbergen | 91b8534 | 2008-10-13 18:45:21 -0500 | [diff] [blame] | 586 | .request = p9_virtio_request, |
| 587 | .cancel = p9_virtio_cancel, |
Eric Van Hensbergen | e2735b7 | 2008-02-06 19:25:58 -0600 | [diff] [blame] | 588 | .maxsize = PAGE_SIZE*16, |
Venkateswararao Jujjuri (JV) | 6f69c39 | 2011-02-06 12:08:01 -0800 | [diff] [blame] | 589 | .pref = P9_TRANS_PREF_PAYLOAD_SEP, |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 590 | .def = 0, |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 591 | .owner = THIS_MODULE, |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 592 | }; |
| 593 | |
| 594 | /* The standard init function */ |
| 595 | static int __init p9_virtio_init(void) |
| 596 | { |
Aneesh Kumar K.V | 37c1209d4 | 2010-02-15 17:27:01 +0000 | [diff] [blame] | 597 | INIT_LIST_HEAD(&virtio_chan_list); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 598 | |
| 599 | v9fs_register_trans(&p9_virtio_trans); |
| 600 | return register_virtio_driver(&p9_virtio_drv); |
| 601 | } |
| 602 | |
Eric Van Hensbergen | f393354 | 2008-02-06 19:25:04 -0600 | [diff] [blame] | 603 | static void __exit p9_virtio_cleanup(void) |
| 604 | { |
| 605 | unregister_virtio_driver(&p9_virtio_drv); |
Tejun Heo | 72029fe | 2008-09-24 16:22:23 -0500 | [diff] [blame] | 606 | v9fs_unregister_trans(&p9_virtio_trans); |
Eric Van Hensbergen | f393354 | 2008-02-06 19:25:04 -0600 | [diff] [blame] | 607 | } |
| 608 | |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 609 | module_init(p9_virtio_init); |
Eric Van Hensbergen | f393354 | 2008-02-06 19:25:04 -0600 | [diff] [blame] | 610 | module_exit(p9_virtio_cleanup); |
Eric Van Hensbergen | b530cc7 | 2007-10-23 13:47:31 -0500 | [diff] [blame] | 611 | |
| 612 | MODULE_DEVICE_TABLE(virtio, id_table); |
| 613 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); |
| 614 | MODULE_DESCRIPTION("Virtio 9p Transport"); |
| 615 | MODULE_LICENSE("GPL"); |