blob: 8c99bf1b5e9fde218dab95f2091b807a7fbb4623 [file] [log] [blame]
Rusty Russella23ea922010-01-18 19:14:55 +05301/*
2 * Copyright (C) 2006, 2007, 2009 Rusty Russell, IBM Corporation
Amit Shah17634ba2009-12-21 21:03:25 +05303 * Copyright (C) 2009, 2010 Red Hat, Inc.
Rusty Russell31610432007-10-22 11:03:39 +10004 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
Amit Shahfb08bd22009-12-21 21:36:04 +053019#include <linux/cdev.h>
Amit Shahd99393e2009-12-21 22:36:21 +053020#include <linux/debugfs.h>
Amit Shahfb08bd22009-12-21 21:36:04 +053021#include <linux/device.h>
Rusty Russell31610432007-10-22 11:03:39 +100022#include <linux/err.h>
Amit Shah2030fa42009-12-21 21:49:30 +053023#include <linux/fs.h>
Rusty Russell31610432007-10-22 11:03:39 +100024#include <linux/init.h>
Amit Shah38edf582010-01-18 19:15:05 +053025#include <linux/list.h>
Amit Shah2030fa42009-12-21 21:49:30 +053026#include <linux/poll.h>
27#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Amit Shah38edf582010-01-18 19:15:05 +053029#include <linux/spinlock.h>
Rusty Russell31610432007-10-22 11:03:39 +100030#include <linux/virtio.h>
31#include <linux/virtio_console.h>
Amit Shah2030fa42009-12-21 21:49:30 +053032#include <linux/wait.h>
Amit Shah17634ba2009-12-21 21:03:25 +053033#include <linux/workqueue.h>
Rusty Russell31610432007-10-22 11:03:39 +100034#include "hvc_console.h"
35
Amit Shah38edf582010-01-18 19:15:05 +053036/*
37 * This is a global struct for storing common data for all the devices
38 * this driver handles.
39 *
40 * Mainly, it has a linked list for all the consoles in one place so
41 * that callbacks from hvc for get_chars(), put_chars() work properly
42 * across multiple devices and multiple ports per device.
43 */
44struct ports_driver_data {
Amit Shahfb08bd22009-12-21 21:36:04 +053045 /* Used for registering chardevs */
46 struct class *class;
47
Amit Shahd99393e2009-12-21 22:36:21 +053048 /* Used for exporting per-port information to debugfs */
49 struct dentry *debugfs_dir;
50
Amit Shahfb08bd22009-12-21 21:36:04 +053051 /* Number of devices this driver is handling */
52 unsigned int index;
53
Rusty Russelld8a02bd2010-01-18 19:15:06 +053054 /*
55 * This is used to keep track of the number of hvc consoles
56 * spawned by this driver. This number is given as the first
57 * argument to hvc_alloc(). To correctly map an initial
58 * console spawned via hvc_instantiate to the console being
59 * hooked up via hvc_alloc, we need to pass the same vtermno.
60 *
61 * We also just assume the first console being initialised was
62 * the first one that got used as the initial console.
63 */
64 unsigned int next_vtermno;
65
Amit Shah38edf582010-01-18 19:15:05 +053066 /* All the console devices handled by this driver */
67 struct list_head consoles;
68};
69static struct ports_driver_data pdrvdata;
70
71DEFINE_SPINLOCK(pdrvdata_lock);
72
Amit Shah4f23c572010-01-18 19:15:09 +053073/* This struct holds information that's relevant only for console ports */
74struct console {
75 /* We'll place all consoles in a list in the pdrvdata struct */
76 struct list_head list;
77
78 /* The hvc device associated with this console port */
79 struct hvc_struct *hvc;
80
Amit Shah97788292010-05-06 02:05:08 +053081 /* The size of the console */
82 struct winsize ws;
83
Amit Shah4f23c572010-01-18 19:15:09 +053084 /*
85 * This number identifies the number that we used to register
86 * with hvc in hvc_instantiate() and hvc_alloc(); this is the
87 * number passed on by the hvc callbacks to us to
88 * differentiate between the other console ports handled by
89 * this driver
90 */
91 u32 vtermno;
92};
93
Amit Shahfdb9a052010-01-18 19:15:01 +053094struct port_buffer {
95 char *buf;
96
97 /* size of the buffer in *buf above */
98 size_t size;
99
100 /* used length of the buffer */
101 size_t len;
102 /* offset in the buf from which to consume data */
103 size_t offset;
104};
105
Amit Shah17634ba2009-12-21 21:03:25 +0530106/*
107 * This is a per-device struct that stores data common to all the
108 * ports for that device (vdev->priv).
109 */
110struct ports_device {
111 /*
112 * Workqueue handlers where we process deferred work after
113 * notification
114 */
115 struct work_struct control_work;
116
117 struct list_head ports;
118
119 /* To protect the list of ports */
120 spinlock_t ports_lock;
121
122 /* To protect the vq operations for the control channel */
123 spinlock_t cvq_lock;
124
125 /* The current config space is stored here */
Amit Shahb99fa812010-05-19 22:15:46 -0600126 struct virtio_console_config config;
Amit Shah17634ba2009-12-21 21:03:25 +0530127
128 /* The virtio device we're associated with */
129 struct virtio_device *vdev;
130
131 /*
132 * A couple of virtqueues for the control channel: one for
133 * guest->host transfers, one for host->guest transfers
134 */
135 struct virtqueue *c_ivq, *c_ovq;
136
137 /* Array of per-port IO virtqueues */
138 struct virtqueue **in_vqs, **out_vqs;
Amit Shahfb08bd22009-12-21 21:36:04 +0530139
140 /* Used for numbering devices for sysfs and debugfs */
141 unsigned int drv_index;
142
143 /* Major number for this device. Ports will be created as minors. */
144 int chr_major;
Amit Shah17634ba2009-12-21 21:03:25 +0530145};
146
Amit Shah1c85bf32010-01-18 19:15:07 +0530147/* This struct holds the per-port data */
Rusty Russell21206ed2010-01-18 19:15:00 +0530148struct port {
Amit Shah17634ba2009-12-21 21:03:25 +0530149 /* Next port in the list, head is in the ports_device */
150 struct list_head list;
151
Amit Shah1c85bf32010-01-18 19:15:07 +0530152 /* Pointer to the parent virtio_console device */
153 struct ports_device *portdev;
Amit Shahfdb9a052010-01-18 19:15:01 +0530154
155 /* The current buffer from which data has to be fed to readers */
156 struct port_buffer *inbuf;
Rusty Russell31610432007-10-22 11:03:39 +1000157
Amit Shah203baab2010-01-18 19:15:12 +0530158 /*
159 * To protect the operations on the in_vq associated with this
160 * port. Has to be a spinlock because it can be called from
161 * interrupt context (get_char()).
162 */
163 spinlock_t inbuf_lock;
164
Amit Shahcdfadfc2010-05-19 22:15:50 -0600165 /* Protect the operations on the out_vq. */
166 spinlock_t outvq_lock;
167
Amit Shah1c85bf32010-01-18 19:15:07 +0530168 /* The IO vqs for this port */
169 struct virtqueue *in_vq, *out_vq;
170
Amit Shahd99393e2009-12-21 22:36:21 +0530171 /* File in the debugfs directory that exposes this port's information */
172 struct dentry *debugfs_file;
173
Amit Shah4f23c572010-01-18 19:15:09 +0530174 /*
175 * The entries in this struct will be valid if this port is
176 * hooked up to an hvc console
177 */
178 struct console cons;
Amit Shah17634ba2009-12-21 21:03:25 +0530179
Amit Shahfb08bd22009-12-21 21:36:04 +0530180 /* Each port associates with a separate char device */
181 struct cdev cdev;
182 struct device *dev;
183
Amit Shah2030fa42009-12-21 21:49:30 +0530184 /* A waitqueue for poll() or blocking read operations */
185 wait_queue_head_t waitqueue;
186
Amit Shah431edb82009-12-21 21:57:40 +0530187 /* The 'name' of the port that we expose via sysfs properties */
188 char *name;
189
Amit Shah17634ba2009-12-21 21:03:25 +0530190 /* The 'id' to identify the port with the Host */
191 u32 id;
Amit Shah2030fa42009-12-21 21:49:30 +0530192
Amit Shahcdfadfc2010-05-19 22:15:50 -0600193 bool outvq_full;
194
Amit Shah2030fa42009-12-21 21:49:30 +0530195 /* Is the host device open */
196 bool host_connected;
Amit Shah3c7969c2009-11-26 11:25:38 +0530197
198 /* We should allow only one process to open a port */
199 bool guest_connected;
Rusty Russell21206ed2010-01-18 19:15:00 +0530200};
Rusty Russell31610432007-10-22 11:03:39 +1000201
Rusty Russell971f3392010-01-18 19:14:56 +0530202/* This is the very early arch-specified put chars function. */
203static int (*early_put_chars)(u32, const char *, int);
204
Amit Shah38edf582010-01-18 19:15:05 +0530205static struct port *find_port_by_vtermno(u32 vtermno)
206{
207 struct port *port;
Amit Shah4f23c572010-01-18 19:15:09 +0530208 struct console *cons;
Amit Shah38edf582010-01-18 19:15:05 +0530209 unsigned long flags;
210
211 spin_lock_irqsave(&pdrvdata_lock, flags);
Amit Shah4f23c572010-01-18 19:15:09 +0530212 list_for_each_entry(cons, &pdrvdata.consoles, list) {
213 if (cons->vtermno == vtermno) {
214 port = container_of(cons, struct port, cons);
Amit Shah38edf582010-01-18 19:15:05 +0530215 goto out;
Amit Shah4f23c572010-01-18 19:15:09 +0530216 }
Amit Shah38edf582010-01-18 19:15:05 +0530217 }
218 port = NULL;
219out:
220 spin_unlock_irqrestore(&pdrvdata_lock, flags);
221 return port;
222}
223
Amit Shah17634ba2009-12-21 21:03:25 +0530224static struct port *find_port_by_id(struct ports_device *portdev, u32 id)
225{
226 struct port *port;
227 unsigned long flags;
228
229 spin_lock_irqsave(&portdev->ports_lock, flags);
230 list_for_each_entry(port, &portdev->ports, list)
231 if (port->id == id)
232 goto out;
233 port = NULL;
234out:
235 spin_unlock_irqrestore(&portdev->ports_lock, flags);
236
237 return port;
238}
239
Amit Shah203baab2010-01-18 19:15:12 +0530240static struct port *find_port_by_vq(struct ports_device *portdev,
241 struct virtqueue *vq)
242{
243 struct port *port;
Amit Shah203baab2010-01-18 19:15:12 +0530244 unsigned long flags;
245
Amit Shah17634ba2009-12-21 21:03:25 +0530246 spin_lock_irqsave(&portdev->ports_lock, flags);
247 list_for_each_entry(port, &portdev->ports, list)
Amit Shah203baab2010-01-18 19:15:12 +0530248 if (port->in_vq == vq || port->out_vq == vq)
249 goto out;
Amit Shah203baab2010-01-18 19:15:12 +0530250 port = NULL;
251out:
Amit Shah17634ba2009-12-21 21:03:25 +0530252 spin_unlock_irqrestore(&portdev->ports_lock, flags);
Amit Shah203baab2010-01-18 19:15:12 +0530253 return port;
254}
255
Amit Shah17634ba2009-12-21 21:03:25 +0530256static bool is_console_port(struct port *port)
257{
258 if (port->cons.hvc)
259 return true;
260 return false;
261}
262
263static inline bool use_multiport(struct ports_device *portdev)
264{
265 /*
266 * This condition can be true when put_chars is called from
267 * early_init
268 */
269 if (!portdev->vdev)
270 return 0;
271 return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT);
272}
273
Amit Shahfdb9a052010-01-18 19:15:01 +0530274static void free_buf(struct port_buffer *buf)
275{
276 kfree(buf->buf);
277 kfree(buf);
278}
279
280static struct port_buffer *alloc_buf(size_t buf_size)
281{
282 struct port_buffer *buf;
283
284 buf = kmalloc(sizeof(*buf), GFP_KERNEL);
285 if (!buf)
286 goto fail;
287 buf->buf = kzalloc(buf_size, GFP_KERNEL);
288 if (!buf->buf)
289 goto free_buf;
290 buf->len = 0;
291 buf->offset = 0;
292 buf->size = buf_size;
293 return buf;
294
295free_buf:
296 kfree(buf);
297fail:
298 return NULL;
299}
300
Amit Shaha3cde442010-01-18 19:15:03 +0530301/* Callers should take appropriate locks */
302static void *get_inbuf(struct port *port)
303{
304 struct port_buffer *buf;
305 struct virtqueue *vq;
306 unsigned int len;
307
308 vq = port->in_vq;
Michael S. Tsirkin505b0452010-04-12 16:18:32 +0300309 buf = virtqueue_get_buf(vq, &len);
Amit Shaha3cde442010-01-18 19:15:03 +0530310 if (buf) {
311 buf->len = len;
312 buf->offset = 0;
313 }
314 return buf;
315}
316
Rusty Russella23ea922010-01-18 19:14:55 +0530317/*
Amit Shahe27b5192010-01-18 19:15:02 +0530318 * Create a scatter-gather list representing our input buffer and put
319 * it in the queue.
320 *
321 * Callers should take appropriate locks.
322 */
Amit Shah203baab2010-01-18 19:15:12 +0530323static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf)
Amit Shahe27b5192010-01-18 19:15:02 +0530324{
325 struct scatterlist sg[1];
Amit Shah203baab2010-01-18 19:15:12 +0530326 int ret;
Amit Shah1c85bf32010-01-18 19:15:07 +0530327
Amit Shahe27b5192010-01-18 19:15:02 +0530328 sg_init_one(sg, buf->buf, buf->size);
329
Michael S. Tsirkin505b0452010-04-12 16:18:32 +0300330 ret = virtqueue_add_buf(vq, sg, 0, 1, buf);
331 virtqueue_kick(vq);
Amit Shah203baab2010-01-18 19:15:12 +0530332 return ret;
333}
334
Amit Shah88f251a2009-12-21 22:15:30 +0530335/* Discard any unread data this port has. Callers lockers. */
336static void discard_port_data(struct port *port)
337{
338 struct port_buffer *buf;
339 struct virtqueue *vq;
340 unsigned int len;
Amit Shahd6933562010-02-12 10:32:18 +0530341 int ret;
Amit Shah88f251a2009-12-21 22:15:30 +0530342
343 vq = port->in_vq;
344 if (port->inbuf)
345 buf = port->inbuf;
346 else
Michael S. Tsirkin505b0452010-04-12 16:18:32 +0300347 buf = virtqueue_get_buf(vq, &len);
Amit Shah88f251a2009-12-21 22:15:30 +0530348
Amit Shahd6933562010-02-12 10:32:18 +0530349 ret = 0;
350 while (buf) {
351 if (add_inbuf(vq, buf) < 0) {
352 ret++;
353 free_buf(buf);
354 }
Michael S. Tsirkin505b0452010-04-12 16:18:32 +0300355 buf = virtqueue_get_buf(vq, &len);
Amit Shah88f251a2009-12-21 22:15:30 +0530356 }
Amit Shah88f251a2009-12-21 22:15:30 +0530357 port->inbuf = NULL;
Amit Shahd6933562010-02-12 10:32:18 +0530358 if (ret)
359 dev_warn(port->dev, "Errors adding %d buffers back to vq\n",
360 ret);
Amit Shah88f251a2009-12-21 22:15:30 +0530361}
362
Amit Shah203baab2010-01-18 19:15:12 +0530363static bool port_has_data(struct port *port)
364{
365 unsigned long flags;
366 bool ret;
367
Amit Shah203baab2010-01-18 19:15:12 +0530368 spin_lock_irqsave(&port->inbuf_lock, flags);
Amit Shahd6933562010-02-12 10:32:18 +0530369 if (port->inbuf) {
Amit Shah203baab2010-01-18 19:15:12 +0530370 ret = true;
Amit Shahd6933562010-02-12 10:32:18 +0530371 goto out;
372 }
373 port->inbuf = get_inbuf(port);
374 if (port->inbuf) {
375 ret = true;
376 goto out;
377 }
378 ret = false;
379out:
Amit Shah203baab2010-01-18 19:15:12 +0530380 spin_unlock_irqrestore(&port->inbuf_lock, flags);
Amit Shah203baab2010-01-18 19:15:12 +0530381 return ret;
382}
383
Amit Shah3425e702010-05-19 22:15:46 -0600384static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id,
385 unsigned int event, unsigned int value)
Amit Shah17634ba2009-12-21 21:03:25 +0530386{
387 struct scatterlist sg[1];
388 struct virtio_console_control cpkt;
389 struct virtqueue *vq;
Amit Shah604b2ad2010-02-24 10:36:51 +0530390 unsigned int len;
Amit Shah17634ba2009-12-21 21:03:25 +0530391
Amit Shah3425e702010-05-19 22:15:46 -0600392 if (!use_multiport(portdev))
Amit Shah17634ba2009-12-21 21:03:25 +0530393 return 0;
394
Amit Shah3425e702010-05-19 22:15:46 -0600395 cpkt.id = port_id;
Amit Shah17634ba2009-12-21 21:03:25 +0530396 cpkt.event = event;
397 cpkt.value = value;
398
Amit Shah3425e702010-05-19 22:15:46 -0600399 vq = portdev->c_ovq;
Amit Shah17634ba2009-12-21 21:03:25 +0530400
401 sg_init_one(sg, &cpkt, sizeof(cpkt));
Michael S. Tsirkin505b0452010-04-12 16:18:32 +0300402 if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt) >= 0) {
403 virtqueue_kick(vq);
404 while (!virtqueue_get_buf(vq, &len))
Amit Shah17634ba2009-12-21 21:03:25 +0530405 cpu_relax();
406 }
407 return 0;
408}
409
Amit Shah3425e702010-05-19 22:15:46 -0600410static ssize_t send_control_msg(struct port *port, unsigned int event,
411 unsigned int value)
412{
413 return __send_control_msg(port->portdev, port->id, event, value);
414}
415
Amit Shahcdfadfc2010-05-19 22:15:50 -0600416/* Callers must take the port->outvq_lock */
417static void reclaim_consumed_buffers(struct port *port)
418{
419 void *buf;
420 unsigned int len;
421
422 while ((buf = virtqueue_get_buf(port->out_vq, &len))) {
423 kfree(buf);
424 port->outvq_full = false;
425 }
426}
427
428static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count,
429 bool nonblock)
Amit Shahf997f00b2009-12-21 17:28:51 +0530430{
431 struct scatterlist sg[1];
432 struct virtqueue *out_vq;
433 ssize_t ret;
Amit Shahcdfadfc2010-05-19 22:15:50 -0600434 unsigned long flags;
Amit Shahf997f00b2009-12-21 17:28:51 +0530435 unsigned int len;
436
437 out_vq = port->out_vq;
438
Amit Shahcdfadfc2010-05-19 22:15:50 -0600439 spin_lock_irqsave(&port->outvq_lock, flags);
440
441 reclaim_consumed_buffers(port);
442
Amit Shahf997f00b2009-12-21 17:28:51 +0530443 sg_init_one(sg, in_buf, in_count);
Michael S. Tsirkin505b0452010-04-12 16:18:32 +0300444 ret = virtqueue_add_buf(out_vq, sg, 1, 0, in_buf);
Amit Shahf997f00b2009-12-21 17:28:51 +0530445
446 /* Tell Host to go! */
Michael S. Tsirkin505b0452010-04-12 16:18:32 +0300447 virtqueue_kick(out_vq);
Amit Shahf997f00b2009-12-21 17:28:51 +0530448
449 if (ret < 0) {
Rusty Russell9ff4cfa2010-04-08 09:46:16 -0600450 in_count = 0;
Amit Shahcdfadfc2010-05-19 22:15:50 -0600451 goto done;
Amit Shahf997f00b2009-12-21 17:28:51 +0530452 }
453
Amit Shahcdfadfc2010-05-19 22:15:50 -0600454 if (ret == 0)
455 port->outvq_full = true;
456
457 if (nonblock)
458 goto done;
459
460 /*
461 * Wait till the host acknowledges it pushed out the data we
462 * sent. This is done for ports in blocking mode or for data
463 * from the hvc_console; the tty operations are performed with
464 * spinlocks held so we can't sleep here.
465 */
Michael S. Tsirkin505b0452010-04-12 16:18:32 +0300466 while (!virtqueue_get_buf(out_vq, &len))
Amit Shahf997f00b2009-12-21 17:28:51 +0530467 cpu_relax();
Amit Shahcdfadfc2010-05-19 22:15:50 -0600468done:
469 spin_unlock_irqrestore(&port->outvq_lock, flags);
470 /*
471 * We're expected to return the amount of data we wrote -- all
472 * of it
473 */
Rusty Russell9ff4cfa2010-04-08 09:46:16 -0600474 return in_count;
Amit Shahf997f00b2009-12-21 17:28:51 +0530475}
476
Amit Shah203baab2010-01-18 19:15:12 +0530477/*
478 * Give out the data that's requested from the buffer that we have
479 * queued up.
480 */
Amit Shahb766cee2009-12-21 21:26:45 +0530481static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count,
482 bool to_user)
Amit Shah203baab2010-01-18 19:15:12 +0530483{
484 struct port_buffer *buf;
485 unsigned long flags;
486
487 if (!out_count || !port_has_data(port))
488 return 0;
489
490 buf = port->inbuf;
Amit Shahb766cee2009-12-21 21:26:45 +0530491 out_count = min(out_count, buf->len - buf->offset);
Amit Shah203baab2010-01-18 19:15:12 +0530492
Amit Shahb766cee2009-12-21 21:26:45 +0530493 if (to_user) {
494 ssize_t ret;
Amit Shah203baab2010-01-18 19:15:12 +0530495
Amit Shahb766cee2009-12-21 21:26:45 +0530496 ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count);
497 if (ret)
498 return -EFAULT;
499 } else {
500 memcpy(out_buf, buf->buf + buf->offset, out_count);
501 }
502
Amit Shah203baab2010-01-18 19:15:12 +0530503 buf->offset += out_count;
504
505 if (buf->offset == buf->len) {
506 /*
507 * We're done using all the data in this buffer.
508 * Re-queue so that the Host can send us more data.
509 */
510 spin_lock_irqsave(&port->inbuf_lock, flags);
511 port->inbuf = NULL;
512
513 if (add_inbuf(port->in_vq, buf) < 0)
Amit Shahfb08bd22009-12-21 21:36:04 +0530514 dev_warn(port->dev, "failed add_buf\n");
Amit Shah203baab2010-01-18 19:15:12 +0530515
516 spin_unlock_irqrestore(&port->inbuf_lock, flags);
517 }
Amit Shahb766cee2009-12-21 21:26:45 +0530518 /* Return the number of bytes actually copied */
Amit Shah203baab2010-01-18 19:15:12 +0530519 return out_count;
Amit Shahe27b5192010-01-18 19:15:02 +0530520}
521
Amit Shah2030fa42009-12-21 21:49:30 +0530522/* The condition that must be true for polling to end */
Amit Shah60caacd2010-05-19 22:15:49 -0600523static bool will_read_block(struct port *port)
Amit Shah2030fa42009-12-21 21:49:30 +0530524{
Amit Shah60caacd2010-05-19 22:15:49 -0600525 return !port_has_data(port) && port->host_connected;
Amit Shah2030fa42009-12-21 21:49:30 +0530526}
527
Amit Shahcdfadfc2010-05-19 22:15:50 -0600528static bool will_write_block(struct port *port)
529{
530 bool ret;
531
532 if (!port->host_connected)
533 return true;
534
535 spin_lock_irq(&port->outvq_lock);
536 /*
537 * Check if the Host has consumed any buffers since we last
538 * sent data (this is only applicable for nonblocking ports).
539 */
540 reclaim_consumed_buffers(port);
541 ret = port->outvq_full;
542 spin_unlock_irq(&port->outvq_lock);
543
544 return ret;
545}
546
Amit Shah2030fa42009-12-21 21:49:30 +0530547static ssize_t port_fops_read(struct file *filp, char __user *ubuf,
548 size_t count, loff_t *offp)
549{
550 struct port *port;
551 ssize_t ret;
552
553 port = filp->private_data;
554
555 if (!port_has_data(port)) {
556 /*
557 * If nothing's connected on the host just return 0 in
558 * case of list_empty; this tells the userspace app
559 * that there's no connection
560 */
561 if (!port->host_connected)
562 return 0;
563 if (filp->f_flags & O_NONBLOCK)
564 return -EAGAIN;
565
566 ret = wait_event_interruptible(port->waitqueue,
Amit Shah60caacd2010-05-19 22:15:49 -0600567 !will_read_block(port));
Amit Shah2030fa42009-12-21 21:49:30 +0530568 if (ret < 0)
569 return ret;
570 }
571 /*
572 * We could've received a disconnection message while we were
573 * waiting for more data.
574 *
575 * This check is not clubbed in the if() statement above as we
576 * might receive some data as well as the host could get
577 * disconnected after we got woken up from our wait. So we
578 * really want to give off whatever data we have and only then
579 * check for host_connected.
580 */
581 if (!port_has_data(port) && !port->host_connected)
582 return 0;
583
584 return fill_readbuf(port, ubuf, count, true);
585}
586
587static ssize_t port_fops_write(struct file *filp, const char __user *ubuf,
588 size_t count, loff_t *offp)
589{
590 struct port *port;
591 char *buf;
592 ssize_t ret;
Amit Shahcdfadfc2010-05-19 22:15:50 -0600593 bool nonblock;
Amit Shah2030fa42009-12-21 21:49:30 +0530594
595 port = filp->private_data;
596
Amit Shahcdfadfc2010-05-19 22:15:50 -0600597 nonblock = filp->f_flags & O_NONBLOCK;
598
599 if (will_write_block(port)) {
600 if (nonblock)
601 return -EAGAIN;
602
603 ret = wait_event_interruptible(port->waitqueue,
604 !will_write_block(port));
605 if (ret < 0)
606 return ret;
607 }
608
Amit Shah2030fa42009-12-21 21:49:30 +0530609 count = min((size_t)(32 * 1024), count);
610
611 buf = kmalloc(count, GFP_KERNEL);
612 if (!buf)
613 return -ENOMEM;
614
615 ret = copy_from_user(buf, ubuf, count);
616 if (ret) {
617 ret = -EFAULT;
618 goto free_buf;
619 }
620
Amit Shahcdfadfc2010-05-19 22:15:50 -0600621 ret = send_buf(port, buf, count, nonblock);
622
623 if (nonblock && ret > 0)
624 goto out;
625
Amit Shah2030fa42009-12-21 21:49:30 +0530626free_buf:
627 kfree(buf);
Amit Shahcdfadfc2010-05-19 22:15:50 -0600628out:
Amit Shah2030fa42009-12-21 21:49:30 +0530629 return ret;
630}
631
632static unsigned int port_fops_poll(struct file *filp, poll_table *wait)
633{
634 struct port *port;
635 unsigned int ret;
636
637 port = filp->private_data;
638 poll_wait(filp, &port->waitqueue, wait);
639
640 ret = 0;
641 if (port->inbuf)
642 ret |= POLLIN | POLLRDNORM;
Amit Shahcdfadfc2010-05-19 22:15:50 -0600643 if (!will_write_block(port))
Amit Shah2030fa42009-12-21 21:49:30 +0530644 ret |= POLLOUT;
645 if (!port->host_connected)
646 ret |= POLLHUP;
647
648 return ret;
649}
650
651static int port_fops_release(struct inode *inode, struct file *filp)
652{
653 struct port *port;
654
655 port = filp->private_data;
656
657 /* Notify host of port being closed */
658 send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0);
659
Amit Shah88f251a2009-12-21 22:15:30 +0530660 spin_lock_irq(&port->inbuf_lock);
Amit Shah3c7969c2009-11-26 11:25:38 +0530661 port->guest_connected = false;
662
Amit Shah88f251a2009-12-21 22:15:30 +0530663 discard_port_data(port);
664
665 spin_unlock_irq(&port->inbuf_lock);
666
Amit Shahcdfadfc2010-05-19 22:15:50 -0600667 spin_lock_irq(&port->outvq_lock);
668 reclaim_consumed_buffers(port);
669 spin_unlock_irq(&port->outvq_lock);
670
Amit Shah2030fa42009-12-21 21:49:30 +0530671 return 0;
672}
673
674static int port_fops_open(struct inode *inode, struct file *filp)
675{
676 struct cdev *cdev = inode->i_cdev;
677 struct port *port;
678
679 port = container_of(cdev, struct port, cdev);
680 filp->private_data = port;
681
682 /*
683 * Don't allow opening of console port devices -- that's done
684 * via /dev/hvc
685 */
686 if (is_console_port(port))
687 return -ENXIO;
688
Amit Shah3c7969c2009-11-26 11:25:38 +0530689 /* Allow only one process to open a particular port at a time */
690 spin_lock_irq(&port->inbuf_lock);
691 if (port->guest_connected) {
692 spin_unlock_irq(&port->inbuf_lock);
693 return -EMFILE;
694 }
695
696 port->guest_connected = true;
697 spin_unlock_irq(&port->inbuf_lock);
698
Amit Shahcdfadfc2010-05-19 22:15:50 -0600699 spin_lock_irq(&port->outvq_lock);
700 /*
701 * There might be a chance that we missed reclaiming a few
702 * buffers in the window of the port getting previously closed
703 * and opening now.
704 */
705 reclaim_consumed_buffers(port);
706 spin_unlock_irq(&port->outvq_lock);
707
Amit Shah2030fa42009-12-21 21:49:30 +0530708 /* Notify host of port being opened */
709 send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1);
710
711 return 0;
712}
713
714/*
715 * The file operations that we support: programs in the guest can open
716 * a console device, read from it, write to it, poll for data and
717 * close it. The devices are at
718 * /dev/vport<device number>p<port number>
719 */
720static const struct file_operations port_fops = {
721 .owner = THIS_MODULE,
722 .open = port_fops_open,
723 .read = port_fops_read,
724 .write = port_fops_write,
725 .poll = port_fops_poll,
726 .release = port_fops_release,
727};
728
Amit Shahe27b5192010-01-18 19:15:02 +0530729/*
Rusty Russella23ea922010-01-18 19:14:55 +0530730 * The put_chars() callback is pretty straightforward.
Rusty Russell31610432007-10-22 11:03:39 +1000731 *
Rusty Russella23ea922010-01-18 19:14:55 +0530732 * We turn the characters into a scatter-gather list, add it to the
733 * output queue and then kick the Host. Then we sit here waiting for
734 * it to finish: inefficient in theory, but in practice
735 * implementations will do it immediately (lguest's Launcher does).
736 */
Rusty Russell31610432007-10-22 11:03:39 +1000737static int put_chars(u32 vtermno, const char *buf, int count)
738{
Rusty Russell21206ed2010-01-18 19:15:00 +0530739 struct port *port;
Amit Shah38edf582010-01-18 19:15:05 +0530740
François Diakhaté162a6892010-03-23 18:23:15 +0530741 if (unlikely(early_put_chars))
742 return early_put_chars(vtermno, buf, count);
743
Amit Shah38edf582010-01-18 19:15:05 +0530744 port = find_port_by_vtermno(vtermno);
745 if (!port)
Amit Shah6dc69f92010-05-19 22:15:47 -0600746 return -EPIPE;
Rusty Russell31610432007-10-22 11:03:39 +1000747
Amit Shahcdfadfc2010-05-19 22:15:50 -0600748 return send_buf(port, (void *)buf, count, false);
Rusty Russell31610432007-10-22 11:03:39 +1000749}
750
Rusty Russella23ea922010-01-18 19:14:55 +0530751/*
Rusty Russella23ea922010-01-18 19:14:55 +0530752 * get_chars() is the callback from the hvc_console infrastructure
753 * when an interrupt is received.
Rusty Russell31610432007-10-22 11:03:39 +1000754 *
Amit Shah203baab2010-01-18 19:15:12 +0530755 * We call out to fill_readbuf that gets us the required data from the
756 * buffers that are queued up.
Rusty Russella23ea922010-01-18 19:14:55 +0530757 */
Rusty Russell31610432007-10-22 11:03:39 +1000758static int get_chars(u32 vtermno, char *buf, int count)
759{
Rusty Russell21206ed2010-01-18 19:15:00 +0530760 struct port *port;
Rusty Russell31610432007-10-22 11:03:39 +1000761
Amit Shah6dc69f92010-05-19 22:15:47 -0600762 /* If we've not set up the port yet, we have no input to give. */
763 if (unlikely(early_put_chars))
764 return 0;
765
Amit Shah38edf582010-01-18 19:15:05 +0530766 port = find_port_by_vtermno(vtermno);
767 if (!port)
Amit Shah6dc69f92010-05-19 22:15:47 -0600768 return -EPIPE;
Rusty Russell21206ed2010-01-18 19:15:00 +0530769
770 /* If we don't have an input queue yet, we can't get input. */
771 BUG_ON(!port->in_vq);
772
Amit Shahb766cee2009-12-21 21:26:45 +0530773 return fill_readbuf(port, buf, count, false);
Rusty Russell31610432007-10-22 11:03:39 +1000774}
Rusty Russell31610432007-10-22 11:03:39 +1000775
Amit Shahcb06e362010-01-18 19:15:08 +0530776static void resize_console(struct port *port)
Christian Borntraegerc2983452008-11-25 13:36:26 +0100777{
Amit Shahcb06e362010-01-18 19:15:08 +0530778 struct virtio_device *vdev;
Christian Borntraegerc2983452008-11-25 13:36:26 +0100779
Amit Shah2de16a42010-03-19 17:36:44 +0530780 /* The port could have been hot-unplugged */
Amit Shah97788292010-05-06 02:05:08 +0530781 if (!port || !is_console_port(port))
Amit Shah2de16a42010-03-19 17:36:44 +0530782 return;
783
Amit Shahcb06e362010-01-18 19:15:08 +0530784 vdev = port->portdev->vdev;
Amit Shah97788292010-05-06 02:05:08 +0530785 if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE))
786 hvc_resize(port->cons.hvc, port->cons.ws);
Christian Borntraegerc2983452008-11-25 13:36:26 +0100787}
788
Amit Shah38edf582010-01-18 19:15:05 +0530789/* We set the configuration at this point, since we now have a tty */
Christian Borntraeger91fcad12008-06-20 15:24:15 +0200790static int notifier_add_vio(struct hvc_struct *hp, int data)
791{
Amit Shah38edf582010-01-18 19:15:05 +0530792 struct port *port;
793
794 port = find_port_by_vtermno(hp->vtermno);
795 if (!port)
796 return -EINVAL;
797
Christian Borntraeger91fcad12008-06-20 15:24:15 +0200798 hp->irq_requested = 1;
Amit Shahcb06e362010-01-18 19:15:08 +0530799 resize_console(port);
Christian Borntraegerc2983452008-11-25 13:36:26 +0100800
Christian Borntraeger91fcad12008-06-20 15:24:15 +0200801 return 0;
802}
803
804static void notifier_del_vio(struct hvc_struct *hp, int data)
805{
806 hp->irq_requested = 0;
807}
808
Amit Shah17634ba2009-12-21 21:03:25 +0530809/* The operations for console ports. */
Rusty Russell1dff3992009-11-28 12:20:26 +0530810static const struct hv_ops hv_ops = {
Rusty Russell971f3392010-01-18 19:14:56 +0530811 .get_chars = get_chars,
812 .put_chars = put_chars,
813 .notifier_add = notifier_add_vio,
814 .notifier_del = notifier_del_vio,
815 .notifier_hangup = notifier_del_vio,
816};
817
818/*
819 * Console drivers are initialized very early so boot messages can go
820 * out, so we do things slightly differently from the generic virtio
821 * initialization of the net and block drivers.
822 *
823 * At this stage, the console is output-only. It's too early to set
824 * up a virtqueue, so we let the drivers do some boutique early-output
825 * thing.
826 */
827int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int))
828{
829 early_put_chars = put_chars;
830 return hvc_instantiate(0, 0, &hv_ops);
831}
832
Amit Shah17634ba2009-12-21 21:03:25 +0530833int init_port_console(struct port *port)
Amit Shahcfa6d372010-01-18 19:15:10 +0530834{
835 int ret;
836
837 /*
838 * The Host's telling us this port is a console port. Hook it
839 * up with an hvc console.
840 *
841 * To set up and manage our virtual console, we call
842 * hvc_alloc().
843 *
844 * The first argument of hvc_alloc() is the virtual console
845 * number. The second argument is the parameter for the
846 * notification mechanism (like irq number). We currently
847 * leave this as zero, virtqueues have implicit notifications.
848 *
849 * The third argument is a "struct hv_ops" containing the
850 * put_chars() get_chars(), notifier_add() and notifier_del()
851 * pointers. The final argument is the output buffer size: we
852 * can do any size, so we put PAGE_SIZE here.
853 */
854 port->cons.vtermno = pdrvdata.next_vtermno;
855
856 port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE);
857 if (IS_ERR(port->cons.hvc)) {
858 ret = PTR_ERR(port->cons.hvc);
Amit Shah298add72010-01-18 16:35:23 +0530859 dev_err(port->dev,
860 "error %d allocating hvc for port\n", ret);
Amit Shahcfa6d372010-01-18 19:15:10 +0530861 port->cons.hvc = NULL;
862 return ret;
863 }
864 spin_lock_irq(&pdrvdata_lock);
865 pdrvdata.next_vtermno++;
866 list_add_tail(&port->cons.list, &pdrvdata.consoles);
867 spin_unlock_irq(&pdrvdata_lock);
Amit Shah3c7969c2009-11-26 11:25:38 +0530868 port->guest_connected = true;
Amit Shahcfa6d372010-01-18 19:15:10 +0530869
Amit Shah1d051602010-05-19 22:15:49 -0600870 /*
871 * Start using the new console output if this is the first
872 * console to come up.
873 */
874 if (early_put_chars)
875 early_put_chars = NULL;
876
Amit Shah2030fa42009-12-21 21:49:30 +0530877 /* Notify host of port being opened */
878 send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1);
879
Amit Shahcfa6d372010-01-18 19:15:10 +0530880 return 0;
881}
882
Amit Shah431edb82009-12-21 21:57:40 +0530883static ssize_t show_port_name(struct device *dev,
884 struct device_attribute *attr, char *buffer)
885{
886 struct port *port;
887
888 port = dev_get_drvdata(dev);
889
890 return sprintf(buffer, "%s\n", port->name);
891}
892
893static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL);
894
895static struct attribute *port_sysfs_entries[] = {
896 &dev_attr_name.attr,
897 NULL
898};
899
900static struct attribute_group port_attribute_group = {
901 .name = NULL, /* put in device directory */
902 .attrs = port_sysfs_entries,
903};
904
Amit Shahd99393e2009-12-21 22:36:21 +0530905static int debugfs_open(struct inode *inode, struct file *filp)
906{
907 filp->private_data = inode->i_private;
908 return 0;
909}
910
911static ssize_t debugfs_read(struct file *filp, char __user *ubuf,
912 size_t count, loff_t *offp)
913{
914 struct port *port;
915 char *buf;
916 ssize_t ret, out_offset, out_count;
917
918 out_count = 1024;
919 buf = kmalloc(out_count, GFP_KERNEL);
920 if (!buf)
921 return -ENOMEM;
922
923 port = filp->private_data;
924 out_offset = 0;
925 out_offset += snprintf(buf + out_offset, out_count,
926 "name: %s\n", port->name ? port->name : "");
927 out_offset += snprintf(buf + out_offset, out_count - out_offset,
928 "guest_connected: %d\n", port->guest_connected);
929 out_offset += snprintf(buf + out_offset, out_count - out_offset,
930 "host_connected: %d\n", port->host_connected);
931 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Amit Shahcdfadfc2010-05-19 22:15:50 -0600932 "outvq_full: %d\n", port->outvq_full);
933 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Amit Shahd99393e2009-12-21 22:36:21 +0530934 "is_console: %s\n",
935 is_console_port(port) ? "yes" : "no");
936 out_offset += snprintf(buf + out_offset, out_count - out_offset,
937 "console_vtermno: %u\n", port->cons.vtermno);
938
939 ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset);
940 kfree(buf);
941 return ret;
942}
943
944static const struct file_operations port_debugfs_ops = {
945 .owner = THIS_MODULE,
946 .open = debugfs_open,
947 .read = debugfs_read,
948};
949
Amit Shah97788292010-05-06 02:05:08 +0530950static void set_console_size(struct port *port, u16 rows, u16 cols)
951{
952 if (!port || !is_console_port(port))
953 return;
954
955 port->cons.ws.ws_row = rows;
956 port->cons.ws.ws_col = cols;
957}
958
Amit Shahc446f8f2010-05-19 22:15:48 -0600959static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock)
960{
961 struct port_buffer *buf;
962 unsigned int nr_added_bufs;
963 int ret;
964
965 nr_added_bufs = 0;
966 do {
967 buf = alloc_buf(PAGE_SIZE);
968 if (!buf)
969 break;
970
971 spin_lock_irq(lock);
972 ret = add_inbuf(vq, buf);
973 if (ret < 0) {
974 spin_unlock_irq(lock);
975 free_buf(buf);
976 break;
977 }
978 nr_added_bufs++;
979 spin_unlock_irq(lock);
980 } while (ret > 0);
981
982 return nr_added_bufs;
983}
984
985static int add_port(struct ports_device *portdev, u32 id)
986{
987 char debugfs_name[16];
988 struct port *port;
989 struct port_buffer *buf;
990 dev_t devt;
991 unsigned int nr_added_bufs;
992 int err;
993
994 port = kmalloc(sizeof(*port), GFP_KERNEL);
995 if (!port) {
996 err = -ENOMEM;
997 goto fail;
998 }
999
1000 port->portdev = portdev;
1001 port->id = id;
1002
1003 port->name = NULL;
1004 port->inbuf = NULL;
1005 port->cons.hvc = NULL;
1006
Amit Shah97788292010-05-06 02:05:08 +05301007 port->cons.ws.ws_row = port->cons.ws.ws_col = 0;
1008
Amit Shahc446f8f2010-05-19 22:15:48 -06001009 port->host_connected = port->guest_connected = false;
1010
Amit Shahcdfadfc2010-05-19 22:15:50 -06001011 port->outvq_full = false;
1012
Amit Shahc446f8f2010-05-19 22:15:48 -06001013 port->in_vq = portdev->in_vqs[port->id];
1014 port->out_vq = portdev->out_vqs[port->id];
1015
1016 cdev_init(&port->cdev, &port_fops);
1017
1018 devt = MKDEV(portdev->chr_major, id);
1019 err = cdev_add(&port->cdev, devt, 1);
1020 if (err < 0) {
1021 dev_err(&port->portdev->vdev->dev,
1022 "Error %d adding cdev for port %u\n", err, id);
1023 goto free_port;
1024 }
1025 port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev,
1026 devt, port, "vport%up%u",
1027 port->portdev->drv_index, id);
1028 if (IS_ERR(port->dev)) {
1029 err = PTR_ERR(port->dev);
1030 dev_err(&port->portdev->vdev->dev,
1031 "Error %d creating device for port %u\n",
1032 err, id);
1033 goto free_cdev;
1034 }
1035
1036 spin_lock_init(&port->inbuf_lock);
Amit Shahcdfadfc2010-05-19 22:15:50 -06001037 spin_lock_init(&port->outvq_lock);
Amit Shahc446f8f2010-05-19 22:15:48 -06001038 init_waitqueue_head(&port->waitqueue);
1039
1040 /* Fill the in_vq with buffers so the host can send us data. */
1041 nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock);
1042 if (!nr_added_bufs) {
1043 dev_err(port->dev, "Error allocating inbufs\n");
1044 err = -ENOMEM;
1045 goto free_device;
1046 }
1047
1048 /*
1049 * If we're not using multiport support, this has to be a console port
1050 */
1051 if (!use_multiport(port->portdev)) {
1052 err = init_port_console(port);
1053 if (err)
1054 goto free_inbufs;
1055 }
1056
1057 spin_lock_irq(&portdev->ports_lock);
1058 list_add_tail(&port->list, &port->portdev->ports);
1059 spin_unlock_irq(&portdev->ports_lock);
1060
1061 /*
1062 * Tell the Host we're set so that it can send us various
1063 * configuration parameters for this port (eg, port name,
1064 * caching, whether this is a console port, etc.)
1065 */
1066 send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1);
1067
1068 if (pdrvdata.debugfs_dir) {
1069 /*
1070 * Finally, create the debugfs file that we can use to
1071 * inspect a port's state at any time
1072 */
1073 sprintf(debugfs_name, "vport%up%u",
1074 port->portdev->drv_index, id);
1075 port->debugfs_file = debugfs_create_file(debugfs_name, 0444,
1076 pdrvdata.debugfs_dir,
1077 port,
1078 &port_debugfs_ops);
1079 }
1080 return 0;
1081
1082free_inbufs:
1083 while ((buf = virtqueue_detach_unused_buf(port->in_vq)))
1084 free_buf(buf);
1085free_device:
1086 device_destroy(pdrvdata.class, port->dev->devt);
1087free_cdev:
1088 cdev_del(&port->cdev);
1089free_port:
1090 kfree(port);
1091fail:
1092 /* The host might want to notify management sw about port add failure */
Julia Lawall0643e4c2010-05-15 11:45:53 +02001093 __send_control_msg(portdev, id, VIRTIO_CONSOLE_PORT_READY, 0);
Amit Shahc446f8f2010-05-19 22:15:48 -06001094 return err;
1095}
1096
Amit Shah1f7aa422009-12-21 22:27:31 +05301097/* Remove all port-specific data. */
1098static int remove_port(struct port *port)
1099{
Amit Shaha9cdd482010-02-12 10:32:15 +05301100 struct port_buffer *buf;
1101
Amit Shah1f7aa422009-12-21 22:27:31 +05301102 spin_lock_irq(&port->portdev->ports_lock);
1103 list_del(&port->list);
1104 spin_unlock_irq(&port->portdev->ports_lock);
1105
1106 if (is_console_port(port)) {
1107 spin_lock_irq(&pdrvdata_lock);
1108 list_del(&port->cons.list);
1109 spin_unlock_irq(&pdrvdata_lock);
Amit Shah69eb9a92010-05-19 22:15:47 -06001110#if 0
1111 /*
1112 * hvc_remove() not called as removing one hvc port
1113 * results in other hvc ports getting frozen.
1114 *
1115 * Once this is resolved in hvc, this functionality
1116 * will be enabled. Till that is done, the -EPIPE
1117 * return from get_chars() above will help
1118 * hvc_console.c to clean up on ports we remove here.
1119 */
Amit Shah1f7aa422009-12-21 22:27:31 +05301120 hvc_remove(port->cons.hvc);
Amit Shah69eb9a92010-05-19 22:15:47 -06001121#endif
Amit Shah1f7aa422009-12-21 22:27:31 +05301122 }
1123 if (port->guest_connected)
1124 send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0);
1125
Amit Shah1f7aa422009-12-21 22:27:31 +05301126 sysfs_remove_group(&port->dev->kobj, &port_attribute_group);
1127 device_destroy(pdrvdata.class, port->dev->devt);
1128 cdev_del(&port->cdev);
1129
Amit Shaha9cdd482010-02-12 10:32:15 +05301130 /* Remove unused data this port might have received. */
Amit Shah1f7aa422009-12-21 22:27:31 +05301131 discard_port_data(port);
Amit Shaha9cdd482010-02-12 10:32:15 +05301132
Amit Shahcdfadfc2010-05-19 22:15:50 -06001133 reclaim_consumed_buffers(port);
1134
Amit Shaha9cdd482010-02-12 10:32:15 +05301135 /* Remove buffers we queued up for the Host to send us data in. */
Michael S. Tsirkin505b0452010-04-12 16:18:32 +03001136 while ((buf = virtqueue_detach_unused_buf(port->in_vq)))
Amit Shaha9cdd482010-02-12 10:32:15 +05301137 free_buf(buf);
1138
Amit Shah1f7aa422009-12-21 22:27:31 +05301139 kfree(port->name);
1140
Amit Shahd99393e2009-12-21 22:36:21 +05301141 debugfs_remove(port->debugfs_file);
1142
Amit Shah1f7aa422009-12-21 22:27:31 +05301143 kfree(port);
1144 return 0;
1145}
1146
Amit Shah17634ba2009-12-21 21:03:25 +05301147/* Any private messages that the Host and Guest want to share */
1148static void handle_control_message(struct ports_device *portdev,
1149 struct port_buffer *buf)
1150{
1151 struct virtio_console_control *cpkt;
1152 struct port *port;
Amit Shah431edb82009-12-21 21:57:40 +05301153 size_t name_size;
1154 int err;
Amit Shah17634ba2009-12-21 21:03:25 +05301155
1156 cpkt = (struct virtio_console_control *)(buf->buf + buf->offset);
1157
1158 port = find_port_by_id(portdev, cpkt->id);
Amit Shahf909f852010-05-19 22:15:48 -06001159 if (!port && cpkt->event != VIRTIO_CONSOLE_PORT_ADD) {
Amit Shah17634ba2009-12-21 21:03:25 +05301160 /* No valid header at start of buffer. Drop it. */
1161 dev_dbg(&portdev->vdev->dev,
1162 "Invalid index %u in control packet\n", cpkt->id);
1163 return;
1164 }
1165
1166 switch (cpkt->event) {
Amit Shahf909f852010-05-19 22:15:48 -06001167 case VIRTIO_CONSOLE_PORT_ADD:
1168 if (port) {
Amit Shah1d051602010-05-19 22:15:49 -06001169 dev_dbg(&portdev->vdev->dev,
1170 "Port %u already added\n", port->id);
Amit Shahf909f852010-05-19 22:15:48 -06001171 send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1);
1172 break;
1173 }
1174 if (cpkt->id >= portdev->config.max_nr_ports) {
1175 dev_warn(&portdev->vdev->dev,
1176 "Request for adding port with out-of-bound id %u, max. supported id: %u\n",
1177 cpkt->id, portdev->config.max_nr_ports - 1);
1178 break;
1179 }
1180 add_port(portdev, cpkt->id);
1181 break;
1182 case VIRTIO_CONSOLE_PORT_REMOVE:
1183 remove_port(port);
1184 break;
Amit Shah17634ba2009-12-21 21:03:25 +05301185 case VIRTIO_CONSOLE_CONSOLE_PORT:
1186 if (!cpkt->value)
1187 break;
1188 if (is_console_port(port))
1189 break;
1190
1191 init_port_console(port);
1192 /*
1193 * Could remove the port here in case init fails - but
1194 * have to notify the host first.
1195 */
1196 break;
Amit Shah8345adb2010-05-06 02:05:09 +05301197 case VIRTIO_CONSOLE_RESIZE: {
1198 struct {
1199 __u16 rows;
1200 __u16 cols;
1201 } size;
1202
Amit Shah17634ba2009-12-21 21:03:25 +05301203 if (!is_console_port(port))
1204 break;
Amit Shah8345adb2010-05-06 02:05:09 +05301205
1206 memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt),
1207 sizeof(size));
1208 set_console_size(port, size.rows, size.cols);
1209
Amit Shah17634ba2009-12-21 21:03:25 +05301210 port->cons.hvc->irq_requested = 1;
1211 resize_console(port);
1212 break;
Amit Shah8345adb2010-05-06 02:05:09 +05301213 }
Amit Shah2030fa42009-12-21 21:49:30 +05301214 case VIRTIO_CONSOLE_PORT_OPEN:
1215 port->host_connected = cpkt->value;
1216 wake_up_interruptible(&port->waitqueue);
Amit Shahcdfadfc2010-05-19 22:15:50 -06001217 /*
1218 * If the host port got closed and the host had any
1219 * unconsumed buffers, we'll be able to reclaim them
1220 * now.
1221 */
1222 spin_lock_irq(&port->outvq_lock);
1223 reclaim_consumed_buffers(port);
1224 spin_unlock_irq(&port->outvq_lock);
Amit Shah2030fa42009-12-21 21:49:30 +05301225 break;
Amit Shah431edb82009-12-21 21:57:40 +05301226 case VIRTIO_CONSOLE_PORT_NAME:
1227 /*
1228 * Skip the size of the header and the cpkt to get the size
1229 * of the name that was sent
1230 */
1231 name_size = buf->len - buf->offset - sizeof(*cpkt) + 1;
1232
1233 port->name = kmalloc(name_size, GFP_KERNEL);
1234 if (!port->name) {
1235 dev_err(port->dev,
1236 "Not enough space to store port name\n");
1237 break;
1238 }
1239 strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt),
1240 name_size - 1);
1241 port->name[name_size - 1] = 0;
1242
1243 /*
1244 * Since we only have one sysfs attribute, 'name',
1245 * create it only if we have a name for the port.
1246 */
1247 err = sysfs_create_group(&port->dev->kobj,
1248 &port_attribute_group);
Amit Shahec642132010-03-19 17:36:43 +05301249 if (err) {
Amit Shah431edb82009-12-21 21:57:40 +05301250 dev_err(port->dev,
1251 "Error %d creating sysfs device attributes\n",
1252 err);
Amit Shahec642132010-03-19 17:36:43 +05301253 } else {
1254 /*
1255 * Generate a udev event so that appropriate
1256 * symlinks can be created based on udev
1257 * rules.
1258 */
1259 kobject_uevent(&port->dev->kobj, KOBJ_CHANGE);
1260 }
Amit Shah431edb82009-12-21 21:57:40 +05301261 break;
Amit Shah17634ba2009-12-21 21:03:25 +05301262 }
1263}
1264
1265static void control_work_handler(struct work_struct *work)
1266{
1267 struct ports_device *portdev;
1268 struct virtqueue *vq;
1269 struct port_buffer *buf;
1270 unsigned int len;
1271
1272 portdev = container_of(work, struct ports_device, control_work);
1273 vq = portdev->c_ivq;
1274
1275 spin_lock(&portdev->cvq_lock);
Michael S. Tsirkin505b0452010-04-12 16:18:32 +03001276 while ((buf = virtqueue_get_buf(vq, &len))) {
Amit Shah17634ba2009-12-21 21:03:25 +05301277 spin_unlock(&portdev->cvq_lock);
1278
1279 buf->len = len;
1280 buf->offset = 0;
1281
1282 handle_control_message(portdev, buf);
1283
1284 spin_lock(&portdev->cvq_lock);
1285 if (add_inbuf(portdev->c_ivq, buf) < 0) {
1286 dev_warn(&portdev->vdev->dev,
1287 "Error adding buffer to queue\n");
1288 free_buf(buf);
1289 }
1290 }
1291 spin_unlock(&portdev->cvq_lock);
1292}
1293
1294static void in_intr(struct virtqueue *vq)
1295{
1296 struct port *port;
1297 unsigned long flags;
1298
1299 port = find_port_by_vq(vq->vdev->priv, vq);
1300 if (!port)
1301 return;
1302
1303 spin_lock_irqsave(&port->inbuf_lock, flags);
Amit Shahd6933562010-02-12 10:32:18 +05301304 if (!port->inbuf)
1305 port->inbuf = get_inbuf(port);
Amit Shah17634ba2009-12-21 21:03:25 +05301306
Amit Shah88f251a2009-12-21 22:15:30 +05301307 /*
1308 * Don't queue up data when port is closed. This condition
1309 * can be reached when a console port is not yet connected (no
1310 * tty is spawned) and the host sends out data to console
1311 * ports. For generic serial ports, the host won't
1312 * (shouldn't) send data till the guest is connected.
1313 */
1314 if (!port->guest_connected)
1315 discard_port_data(port);
1316
Amit Shah17634ba2009-12-21 21:03:25 +05301317 spin_unlock_irqrestore(&port->inbuf_lock, flags);
1318
Amit Shah2030fa42009-12-21 21:49:30 +05301319 wake_up_interruptible(&port->waitqueue);
1320
Amit Shah17634ba2009-12-21 21:03:25 +05301321 if (is_console_port(port) && hvc_poll(port->cons.hvc))
1322 hvc_kick();
1323}
1324
1325static void control_intr(struct virtqueue *vq)
1326{
1327 struct ports_device *portdev;
1328
1329 portdev = vq->vdev->priv;
1330 schedule_work(&portdev->control_work);
1331}
1332
Amit Shah7f5d8102009-12-21 22:22:08 +05301333static void config_intr(struct virtio_device *vdev)
1334{
1335 struct ports_device *portdev;
1336
1337 portdev = vdev->priv;
Amit Shah99f905f2010-05-19 22:15:48 -06001338
Amit Shah4038f5b72010-05-06 02:05:07 +05301339 if (!use_multiport(portdev)) {
Amit Shah97788292010-05-06 02:05:08 +05301340 struct port *port;
1341 u16 rows, cols;
1342
1343 vdev->config->get(vdev,
1344 offsetof(struct virtio_console_config, cols),
1345 &cols, sizeof(u16));
1346 vdev->config->get(vdev,
1347 offsetof(struct virtio_console_config, rows),
1348 &rows, sizeof(u16));
1349
1350 port = find_port_by_id(portdev, 0);
1351 set_console_size(port, rows, cols);
1352
Amit Shah4038f5b72010-05-06 02:05:07 +05301353 /*
1354 * We'll use this way of resizing only for legacy
1355 * support. For newer userspace
1356 * (VIRTIO_CONSOLE_F_MULTPORT+), use control messages
1357 * to indicate console size changes so that it can be
1358 * done per-port.
1359 */
Amit Shah97788292010-05-06 02:05:08 +05301360 resize_console(port);
Amit Shah4038f5b72010-05-06 02:05:07 +05301361 }
Amit Shah7f5d8102009-12-21 22:22:08 +05301362}
1363
Amit Shah2658a792010-01-18 19:15:11 +05301364static int init_vqs(struct ports_device *portdev)
1365{
1366 vq_callback_t **io_callbacks;
1367 char **io_names;
1368 struct virtqueue **vqs;
Amit Shah17634ba2009-12-21 21:03:25 +05301369 u32 i, j, nr_ports, nr_queues;
Amit Shah2658a792010-01-18 19:15:11 +05301370 int err;
1371
Amit Shah17634ba2009-12-21 21:03:25 +05301372 nr_ports = portdev->config.max_nr_ports;
1373 nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2;
Amit Shah2658a792010-01-18 19:15:11 +05301374
1375 vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL);
1376 if (!vqs) {
1377 err = -ENOMEM;
1378 goto fail;
1379 }
1380 io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL);
1381 if (!io_callbacks) {
1382 err = -ENOMEM;
1383 goto free_vqs;
1384 }
1385 io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL);
1386 if (!io_names) {
1387 err = -ENOMEM;
1388 goto free_callbacks;
1389 }
1390 portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *),
1391 GFP_KERNEL);
1392 if (!portdev->in_vqs) {
1393 err = -ENOMEM;
1394 goto free_names;
1395 }
1396 portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *),
1397 GFP_KERNEL);
1398 if (!portdev->out_vqs) {
1399 err = -ENOMEM;
1400 goto free_invqs;
1401 }
1402
Amit Shah17634ba2009-12-21 21:03:25 +05301403 /*
1404 * For backward compat (newer host but older guest), the host
1405 * spawns a console port first and also inits the vqs for port
1406 * 0 before others.
1407 */
1408 j = 0;
1409 io_callbacks[j] = in_intr;
1410 io_callbacks[j + 1] = NULL;
1411 io_names[j] = "input";
1412 io_names[j + 1] = "output";
1413 j += 2;
Amit Shah2658a792010-01-18 19:15:11 +05301414
Amit Shah17634ba2009-12-21 21:03:25 +05301415 if (use_multiport(portdev)) {
1416 io_callbacks[j] = control_intr;
1417 io_callbacks[j + 1] = NULL;
1418 io_names[j] = "control-i";
1419 io_names[j + 1] = "control-o";
1420
1421 for (i = 1; i < nr_ports; i++) {
1422 j += 2;
1423 io_callbacks[j] = in_intr;
1424 io_callbacks[j + 1] = NULL;
1425 io_names[j] = "input";
1426 io_names[j + 1] = "output";
1427 }
1428 }
Amit Shah2658a792010-01-18 19:15:11 +05301429 /* Find the queues. */
1430 err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs,
1431 io_callbacks,
1432 (const char **)io_names);
1433 if (err)
1434 goto free_outvqs;
1435
Amit Shah17634ba2009-12-21 21:03:25 +05301436 j = 0;
Amit Shah2658a792010-01-18 19:15:11 +05301437 portdev->in_vqs[0] = vqs[0];
1438 portdev->out_vqs[0] = vqs[1];
Amit Shah17634ba2009-12-21 21:03:25 +05301439 j += 2;
1440 if (use_multiport(portdev)) {
1441 portdev->c_ivq = vqs[j];
1442 portdev->c_ovq = vqs[j + 1];
Amit Shah2658a792010-01-18 19:15:11 +05301443
Amit Shah17634ba2009-12-21 21:03:25 +05301444 for (i = 1; i < nr_ports; i++) {
1445 j += 2;
1446 portdev->in_vqs[i] = vqs[j];
1447 portdev->out_vqs[i] = vqs[j + 1];
1448 }
1449 }
Amit Shah2658a792010-01-18 19:15:11 +05301450 kfree(io_callbacks);
1451 kfree(io_names);
1452 kfree(vqs);
1453
1454 return 0;
1455
1456free_names:
1457 kfree(io_names);
1458free_callbacks:
1459 kfree(io_callbacks);
1460free_outvqs:
1461 kfree(portdev->out_vqs);
1462free_invqs:
1463 kfree(portdev->in_vqs);
1464free_vqs:
1465 kfree(vqs);
1466fail:
1467 return err;
1468}
1469
Amit Shahfb08bd22009-12-21 21:36:04 +05301470static const struct file_operations portdev_fops = {
1471 .owner = THIS_MODULE,
1472};
1473
Amit Shah1c85bf32010-01-18 19:15:07 +05301474/*
1475 * Once we're further in boot, we get probed like any other virtio
1476 * device.
Amit Shah17634ba2009-12-21 21:03:25 +05301477 *
1478 * If the host also supports multiple console ports, we check the
1479 * config space to see how many ports the host has spawned. We
1480 * initialize each port found.
Amit Shah1c85bf32010-01-18 19:15:07 +05301481 */
1482static int __devinit virtcons_probe(struct virtio_device *vdev)
1483{
Amit Shah1c85bf32010-01-18 19:15:07 +05301484 struct ports_device *portdev;
1485 int err;
Amit Shah17634ba2009-12-21 21:03:25 +05301486 bool multiport;
Amit Shah1c85bf32010-01-18 19:15:07 +05301487
1488 portdev = kmalloc(sizeof(*portdev), GFP_KERNEL);
1489 if (!portdev) {
1490 err = -ENOMEM;
1491 goto fail;
1492 }
1493
1494 /* Attach this portdev to this virtio_device, and vice-versa. */
1495 portdev->vdev = vdev;
1496 vdev->priv = portdev;
1497
Amit Shahfb08bd22009-12-21 21:36:04 +05301498 spin_lock_irq(&pdrvdata_lock);
1499 portdev->drv_index = pdrvdata.index++;
1500 spin_unlock_irq(&pdrvdata_lock);
1501
1502 portdev->chr_major = register_chrdev(0, "virtio-portsdev",
1503 &portdev_fops);
1504 if (portdev->chr_major < 0) {
1505 dev_err(&vdev->dev,
1506 "Error %d registering chrdev for device %u\n",
1507 portdev->chr_major, portdev->drv_index);
1508 err = portdev->chr_major;
1509 goto free;
1510 }
1511
Amit Shah17634ba2009-12-21 21:03:25 +05301512 multiport = false;
Amit Shah17634ba2009-12-21 21:03:25 +05301513 portdev->config.max_nr_ports = 1;
1514 if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) {
1515 multiport = true;
1516 vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT;
1517
Amit Shahb99fa812010-05-19 22:15:46 -06001518 vdev->config->get(vdev, offsetof(struct virtio_console_config,
Amit Shahb99fa812010-05-19 22:15:46 -06001519 max_nr_ports),
Amit Shah17634ba2009-12-21 21:03:25 +05301520 &portdev->config.max_nr_ports,
1521 sizeof(portdev->config.max_nr_ports));
Amit Shah17634ba2009-12-21 21:03:25 +05301522 }
1523
1524 /* Let the Host know we support multiple ports.*/
1525 vdev->config->finalize_features(vdev);
1526
Amit Shah2658a792010-01-18 19:15:11 +05301527 err = init_vqs(portdev);
1528 if (err < 0) {
1529 dev_err(&vdev->dev, "Error %d initializing vqs\n", err);
Amit Shahfb08bd22009-12-21 21:36:04 +05301530 goto free_chrdev;
Amit Shah2658a792010-01-18 19:15:11 +05301531 }
Amit Shah1c85bf32010-01-18 19:15:07 +05301532
Amit Shah17634ba2009-12-21 21:03:25 +05301533 spin_lock_init(&portdev->ports_lock);
1534 INIT_LIST_HEAD(&portdev->ports);
1535
1536 if (multiport) {
Amit Shah335a64a5c2010-02-24 10:37:44 +05301537 unsigned int nr_added_bufs;
1538
Amit Shah17634ba2009-12-21 21:03:25 +05301539 spin_lock_init(&portdev->cvq_lock);
1540 INIT_WORK(&portdev->control_work, &control_work_handler);
1541
Amit Shah335a64a5c2010-02-24 10:37:44 +05301542 nr_added_bufs = fill_queue(portdev->c_ivq, &portdev->cvq_lock);
1543 if (!nr_added_bufs) {
Amit Shah22a29ea2010-02-12 10:32:17 +05301544 dev_err(&vdev->dev,
1545 "Error allocating buffers for control queue\n");
1546 err = -ENOMEM;
1547 goto free_vqs;
1548 }
Amit Shah1d051602010-05-19 22:15:49 -06001549 } else {
1550 /*
1551 * For backward compatibility: Create a console port
1552 * if we're running on older host.
1553 */
1554 add_port(portdev, 0);
Amit Shah17634ba2009-12-21 21:03:25 +05301555 }
1556
Amit Shahf909f852010-05-19 22:15:48 -06001557 __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID,
1558 VIRTIO_CONSOLE_DEVICE_READY, 1);
Rusty Russell31610432007-10-22 11:03:39 +10001559 return 0;
1560
Amit Shah22a29ea2010-02-12 10:32:17 +05301561free_vqs:
Julia Lawall0643e4c2010-05-15 11:45:53 +02001562 /* The host might want to notify mgmt sw about device add failure */
1563 __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID,
1564 VIRTIO_CONSOLE_DEVICE_READY, 0);
Amit Shah22a29ea2010-02-12 10:32:17 +05301565 vdev->config->del_vqs(vdev);
1566 kfree(portdev->in_vqs);
1567 kfree(portdev->out_vqs);
Amit Shahfb08bd22009-12-21 21:36:04 +05301568free_chrdev:
1569 unregister_chrdev(portdev->chr_major, "virtio-portsdev");
Rusty Russell31610432007-10-22 11:03:39 +10001570free:
Amit Shah1c85bf32010-01-18 19:15:07 +05301571 kfree(portdev);
Rusty Russell31610432007-10-22 11:03:39 +10001572fail:
1573 return err;
1574}
1575
Amit Shah71778762010-02-12 10:32:16 +05301576static void virtcons_remove(struct virtio_device *vdev)
1577{
1578 struct ports_device *portdev;
1579 struct port *port, *port2;
1580 struct port_buffer *buf;
1581 unsigned int len;
1582
1583 portdev = vdev->priv;
1584
1585 cancel_work_sync(&portdev->control_work);
Amit Shah71778762010-02-12 10:32:16 +05301586
1587 list_for_each_entry_safe(port, port2, &portdev->ports, list)
1588 remove_port(port);
1589
1590 unregister_chrdev(portdev->chr_major, "virtio-portsdev");
1591
Michael S. Tsirkin505b0452010-04-12 16:18:32 +03001592 while ((buf = virtqueue_get_buf(portdev->c_ivq, &len)))
Amit Shah71778762010-02-12 10:32:16 +05301593 free_buf(buf);
1594
Michael S. Tsirkin505b0452010-04-12 16:18:32 +03001595 while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq)))
Amit Shah71778762010-02-12 10:32:16 +05301596 free_buf(buf);
1597
1598 vdev->config->del_vqs(vdev);
1599 kfree(portdev->in_vqs);
1600 kfree(portdev->out_vqs);
1601
1602 kfree(portdev);
1603}
1604
Rusty Russell31610432007-10-22 11:03:39 +10001605static struct virtio_device_id id_table[] = {
1606 { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID },
1607 { 0 },
1608};
1609
Christian Borntraegerc2983452008-11-25 13:36:26 +01001610static unsigned int features[] = {
1611 VIRTIO_CONSOLE_F_SIZE,
Amit Shahb99fa812010-05-19 22:15:46 -06001612 VIRTIO_CONSOLE_F_MULTIPORT,
Christian Borntraegerc2983452008-11-25 13:36:26 +01001613};
1614
Rusty Russell31610432007-10-22 11:03:39 +10001615static struct virtio_driver virtio_console = {
Christian Borntraegerc2983452008-11-25 13:36:26 +01001616 .feature_table = features,
1617 .feature_table_size = ARRAY_SIZE(features),
Rusty Russell31610432007-10-22 11:03:39 +10001618 .driver.name = KBUILD_MODNAME,
1619 .driver.owner = THIS_MODULE,
1620 .id_table = id_table,
1621 .probe = virtcons_probe,
Amit Shah71778762010-02-12 10:32:16 +05301622 .remove = virtcons_remove,
Amit Shah7f5d8102009-12-21 22:22:08 +05301623 .config_changed = config_intr,
Rusty Russell31610432007-10-22 11:03:39 +10001624};
1625
1626static int __init init(void)
1627{
Amit Shahfb08bd22009-12-21 21:36:04 +05301628 int err;
1629
1630 pdrvdata.class = class_create(THIS_MODULE, "virtio-ports");
1631 if (IS_ERR(pdrvdata.class)) {
1632 err = PTR_ERR(pdrvdata.class);
1633 pr_err("Error %d creating virtio-ports class\n", err);
1634 return err;
1635 }
Amit Shahd99393e2009-12-21 22:36:21 +05301636
1637 pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL);
1638 if (!pdrvdata.debugfs_dir) {
1639 pr_warning("Error %ld creating debugfs dir for virtio-ports\n",
1640 PTR_ERR(pdrvdata.debugfs_dir));
1641 }
Amit Shah38edf582010-01-18 19:15:05 +05301642 INIT_LIST_HEAD(&pdrvdata.consoles);
1643
Rusty Russell31610432007-10-22 11:03:39 +10001644 return register_virtio_driver(&virtio_console);
1645}
Amit Shah71778762010-02-12 10:32:16 +05301646
1647static void __exit fini(void)
1648{
1649 unregister_virtio_driver(&virtio_console);
1650
1651 class_destroy(pdrvdata.class);
1652 if (pdrvdata.debugfs_dir)
1653 debugfs_remove_recursive(pdrvdata.debugfs_dir);
1654}
Rusty Russell31610432007-10-22 11:03:39 +10001655module_init(init);
Amit Shah71778762010-02-12 10:32:16 +05301656module_exit(fini);
Rusty Russell31610432007-10-22 11:03:39 +10001657
1658MODULE_DEVICE_TABLE(virtio, id_table);
1659MODULE_DESCRIPTION("Virtio console driver");
1660MODULE_LICENSE("GPL");