blob: 942a9826bd23ed64b83095fcdeb65ed059c9ce02 [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
Amit Shah60e5e0b2010-05-27 13:24:40 +0530532 if (!port->guest_connected) {
533 /* Port got hot-unplugged. Let's exit. */
534 return false;
535 }
Amit Shahcdfadfc2010-05-19 22:15:50 -0600536 if (!port->host_connected)
537 return true;
538
539 spin_lock_irq(&port->outvq_lock);
540 /*
541 * Check if the Host has consumed any buffers since we last
542 * sent data (this is only applicable for nonblocking ports).
543 */
544 reclaim_consumed_buffers(port);
545 ret = port->outvq_full;
546 spin_unlock_irq(&port->outvq_lock);
547
548 return ret;
549}
550
Amit Shah2030fa42009-12-21 21:49:30 +0530551static ssize_t port_fops_read(struct file *filp, char __user *ubuf,
552 size_t count, loff_t *offp)
553{
554 struct port *port;
555 ssize_t ret;
556
557 port = filp->private_data;
558
559 if (!port_has_data(port)) {
560 /*
561 * If nothing's connected on the host just return 0 in
562 * case of list_empty; this tells the userspace app
563 * that there's no connection
564 */
565 if (!port->host_connected)
566 return 0;
567 if (filp->f_flags & O_NONBLOCK)
568 return -EAGAIN;
569
570 ret = wait_event_interruptible(port->waitqueue,
Amit Shah60caacd2010-05-19 22:15:49 -0600571 !will_read_block(port));
Amit Shah2030fa42009-12-21 21:49:30 +0530572 if (ret < 0)
573 return ret;
574 }
575 /*
576 * We could've received a disconnection message while we were
577 * waiting for more data.
578 *
579 * This check is not clubbed in the if() statement above as we
580 * might receive some data as well as the host could get
581 * disconnected after we got woken up from our wait. So we
582 * really want to give off whatever data we have and only then
583 * check for host_connected.
584 */
585 if (!port_has_data(port) && !port->host_connected)
586 return 0;
587
588 return fill_readbuf(port, ubuf, count, true);
589}
590
591static ssize_t port_fops_write(struct file *filp, const char __user *ubuf,
592 size_t count, loff_t *offp)
593{
594 struct port *port;
595 char *buf;
596 ssize_t ret;
Amit Shahcdfadfc2010-05-19 22:15:50 -0600597 bool nonblock;
Amit Shah2030fa42009-12-21 21:49:30 +0530598
599 port = filp->private_data;
600
Amit Shahcdfadfc2010-05-19 22:15:50 -0600601 nonblock = filp->f_flags & O_NONBLOCK;
602
603 if (will_write_block(port)) {
604 if (nonblock)
605 return -EAGAIN;
606
607 ret = wait_event_interruptible(port->waitqueue,
608 !will_write_block(port));
609 if (ret < 0)
610 return ret;
611 }
612
Amit Shah2030fa42009-12-21 21:49:30 +0530613 count = min((size_t)(32 * 1024), count);
614
615 buf = kmalloc(count, GFP_KERNEL);
616 if (!buf)
617 return -ENOMEM;
618
619 ret = copy_from_user(buf, ubuf, count);
620 if (ret) {
621 ret = -EFAULT;
622 goto free_buf;
623 }
624
Amit Shahcdfadfc2010-05-19 22:15:50 -0600625 ret = send_buf(port, buf, count, nonblock);
626
627 if (nonblock && ret > 0)
628 goto out;
629
Amit Shah2030fa42009-12-21 21:49:30 +0530630free_buf:
631 kfree(buf);
Amit Shahcdfadfc2010-05-19 22:15:50 -0600632out:
Amit Shah2030fa42009-12-21 21:49:30 +0530633 return ret;
634}
635
636static unsigned int port_fops_poll(struct file *filp, poll_table *wait)
637{
638 struct port *port;
639 unsigned int ret;
640
641 port = filp->private_data;
642 poll_wait(filp, &port->waitqueue, wait);
643
644 ret = 0;
645 if (port->inbuf)
646 ret |= POLLIN | POLLRDNORM;
Amit Shahcdfadfc2010-05-19 22:15:50 -0600647 if (!will_write_block(port))
Amit Shah2030fa42009-12-21 21:49:30 +0530648 ret |= POLLOUT;
649 if (!port->host_connected)
650 ret |= POLLHUP;
651
652 return ret;
653}
654
655static int port_fops_release(struct inode *inode, struct file *filp)
656{
657 struct port *port;
658
659 port = filp->private_data;
660
661 /* Notify host of port being closed */
662 send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0);
663
Amit Shah88f251a2009-12-21 22:15:30 +0530664 spin_lock_irq(&port->inbuf_lock);
Amit Shah3c7969c2009-11-26 11:25:38 +0530665 port->guest_connected = false;
666
Amit Shah88f251a2009-12-21 22:15:30 +0530667 discard_port_data(port);
668
669 spin_unlock_irq(&port->inbuf_lock);
670
Amit Shahcdfadfc2010-05-19 22:15:50 -0600671 spin_lock_irq(&port->outvq_lock);
672 reclaim_consumed_buffers(port);
673 spin_unlock_irq(&port->outvq_lock);
674
Amit Shah2030fa42009-12-21 21:49:30 +0530675 return 0;
676}
677
678static int port_fops_open(struct inode *inode, struct file *filp)
679{
680 struct cdev *cdev = inode->i_cdev;
681 struct port *port;
682
683 port = container_of(cdev, struct port, cdev);
684 filp->private_data = port;
685
686 /*
687 * Don't allow opening of console port devices -- that's done
688 * via /dev/hvc
689 */
690 if (is_console_port(port))
691 return -ENXIO;
692
Amit Shah3c7969c2009-11-26 11:25:38 +0530693 /* Allow only one process to open a particular port at a time */
694 spin_lock_irq(&port->inbuf_lock);
695 if (port->guest_connected) {
696 spin_unlock_irq(&port->inbuf_lock);
697 return -EMFILE;
698 }
699
700 port->guest_connected = true;
701 spin_unlock_irq(&port->inbuf_lock);
702
Amit Shahcdfadfc2010-05-19 22:15:50 -0600703 spin_lock_irq(&port->outvq_lock);
704 /*
705 * There might be a chance that we missed reclaiming a few
706 * buffers in the window of the port getting previously closed
707 * and opening now.
708 */
709 reclaim_consumed_buffers(port);
710 spin_unlock_irq(&port->outvq_lock);
711
Amit Shah2030fa42009-12-21 21:49:30 +0530712 /* Notify host of port being opened */
713 send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1);
714
715 return 0;
716}
717
718/*
719 * The file operations that we support: programs in the guest can open
720 * a console device, read from it, write to it, poll for data and
721 * close it. The devices are at
722 * /dev/vport<device number>p<port number>
723 */
724static const struct file_operations port_fops = {
725 .owner = THIS_MODULE,
726 .open = port_fops_open,
727 .read = port_fops_read,
728 .write = port_fops_write,
729 .poll = port_fops_poll,
730 .release = port_fops_release,
731};
732
Amit Shahe27b5192010-01-18 19:15:02 +0530733/*
Rusty Russella23ea922010-01-18 19:14:55 +0530734 * The put_chars() callback is pretty straightforward.
Rusty Russell31610432007-10-22 11:03:39 +1000735 *
Rusty Russella23ea922010-01-18 19:14:55 +0530736 * We turn the characters into a scatter-gather list, add it to the
737 * output queue and then kick the Host. Then we sit here waiting for
738 * it to finish: inefficient in theory, but in practice
739 * implementations will do it immediately (lguest's Launcher does).
740 */
Rusty Russell31610432007-10-22 11:03:39 +1000741static int put_chars(u32 vtermno, const char *buf, int count)
742{
Rusty Russell21206ed2010-01-18 19:15:00 +0530743 struct port *port;
Amit Shah38edf582010-01-18 19:15:05 +0530744
François Diakhaté162a6892010-03-23 18:23:15 +0530745 if (unlikely(early_put_chars))
746 return early_put_chars(vtermno, buf, count);
747
Amit Shah38edf582010-01-18 19:15:05 +0530748 port = find_port_by_vtermno(vtermno);
749 if (!port)
Amit Shah6dc69f972010-05-19 22:15:47 -0600750 return -EPIPE;
Rusty Russell31610432007-10-22 11:03:39 +1000751
Amit Shahcdfadfc2010-05-19 22:15:50 -0600752 return send_buf(port, (void *)buf, count, false);
Rusty Russell31610432007-10-22 11:03:39 +1000753}
754
Rusty Russella23ea922010-01-18 19:14:55 +0530755/*
Rusty Russella23ea922010-01-18 19:14:55 +0530756 * get_chars() is the callback from the hvc_console infrastructure
757 * when an interrupt is received.
Rusty Russell31610432007-10-22 11:03:39 +1000758 *
Amit Shah203baab2010-01-18 19:15:12 +0530759 * We call out to fill_readbuf that gets us the required data from the
760 * buffers that are queued up.
Rusty Russella23ea922010-01-18 19:14:55 +0530761 */
Rusty Russell31610432007-10-22 11:03:39 +1000762static int get_chars(u32 vtermno, char *buf, int count)
763{
Rusty Russell21206ed2010-01-18 19:15:00 +0530764 struct port *port;
Rusty Russell31610432007-10-22 11:03:39 +1000765
Amit Shah6dc69f972010-05-19 22:15:47 -0600766 /* If we've not set up the port yet, we have no input to give. */
767 if (unlikely(early_put_chars))
768 return 0;
769
Amit Shah38edf582010-01-18 19:15:05 +0530770 port = find_port_by_vtermno(vtermno);
771 if (!port)
Amit Shah6dc69f972010-05-19 22:15:47 -0600772 return -EPIPE;
Rusty Russell21206ed2010-01-18 19:15:00 +0530773
774 /* If we don't have an input queue yet, we can't get input. */
775 BUG_ON(!port->in_vq);
776
Amit Shahb766cee2009-12-21 21:26:45 +0530777 return fill_readbuf(port, buf, count, false);
Rusty Russell31610432007-10-22 11:03:39 +1000778}
Rusty Russell31610432007-10-22 11:03:39 +1000779
Amit Shahcb06e362010-01-18 19:15:08 +0530780static void resize_console(struct port *port)
Christian Borntraegerc2983452008-11-25 13:36:26 +0100781{
Amit Shahcb06e362010-01-18 19:15:08 +0530782 struct virtio_device *vdev;
Christian Borntraegerc2983452008-11-25 13:36:26 +0100783
Amit Shah2de16a42010-03-19 17:36:44 +0530784 /* The port could have been hot-unplugged */
Amit Shah97788292010-05-06 02:05:08 +0530785 if (!port || !is_console_port(port))
Amit Shah2de16a42010-03-19 17:36:44 +0530786 return;
787
Amit Shahcb06e362010-01-18 19:15:08 +0530788 vdev = port->portdev->vdev;
Amit Shah97788292010-05-06 02:05:08 +0530789 if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE))
790 hvc_resize(port->cons.hvc, port->cons.ws);
Christian Borntraegerc2983452008-11-25 13:36:26 +0100791}
792
Amit Shah38edf582010-01-18 19:15:05 +0530793/* We set the configuration at this point, since we now have a tty */
Christian Borntraeger91fcad12008-06-20 15:24:15 +0200794static int notifier_add_vio(struct hvc_struct *hp, int data)
795{
Amit Shah38edf582010-01-18 19:15:05 +0530796 struct port *port;
797
798 port = find_port_by_vtermno(hp->vtermno);
799 if (!port)
800 return -EINVAL;
801
Christian Borntraeger91fcad12008-06-20 15:24:15 +0200802 hp->irq_requested = 1;
Amit Shahcb06e362010-01-18 19:15:08 +0530803 resize_console(port);
Christian Borntraegerc2983452008-11-25 13:36:26 +0100804
Christian Borntraeger91fcad12008-06-20 15:24:15 +0200805 return 0;
806}
807
808static void notifier_del_vio(struct hvc_struct *hp, int data)
809{
810 hp->irq_requested = 0;
811}
812
Amit Shah17634ba2009-12-21 21:03:25 +0530813/* The operations for console ports. */
Rusty Russell1dff3992009-11-28 12:20:26 +0530814static const struct hv_ops hv_ops = {
Rusty Russell971f3392010-01-18 19:14:56 +0530815 .get_chars = get_chars,
816 .put_chars = put_chars,
817 .notifier_add = notifier_add_vio,
818 .notifier_del = notifier_del_vio,
819 .notifier_hangup = notifier_del_vio,
820};
821
822/*
823 * Console drivers are initialized very early so boot messages can go
824 * out, so we do things slightly differently from the generic virtio
825 * initialization of the net and block drivers.
826 *
827 * At this stage, the console is output-only. It's too early to set
828 * up a virtqueue, so we let the drivers do some boutique early-output
829 * thing.
830 */
831int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int))
832{
833 early_put_chars = put_chars;
834 return hvc_instantiate(0, 0, &hv_ops);
835}
836
Amit Shah17634ba2009-12-21 21:03:25 +0530837int init_port_console(struct port *port)
Amit Shahcfa6d372010-01-18 19:15:10 +0530838{
839 int ret;
840
841 /*
842 * The Host's telling us this port is a console port. Hook it
843 * up with an hvc console.
844 *
845 * To set up and manage our virtual console, we call
846 * hvc_alloc().
847 *
848 * The first argument of hvc_alloc() is the virtual console
849 * number. The second argument is the parameter for the
850 * notification mechanism (like irq number). We currently
851 * leave this as zero, virtqueues have implicit notifications.
852 *
853 * The third argument is a "struct hv_ops" containing the
854 * put_chars() get_chars(), notifier_add() and notifier_del()
855 * pointers. The final argument is the output buffer size: we
856 * can do any size, so we put PAGE_SIZE here.
857 */
858 port->cons.vtermno = pdrvdata.next_vtermno;
859
860 port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE);
861 if (IS_ERR(port->cons.hvc)) {
862 ret = PTR_ERR(port->cons.hvc);
Amit Shah298add72010-01-18 16:35:23 +0530863 dev_err(port->dev,
864 "error %d allocating hvc for port\n", ret);
Amit Shahcfa6d372010-01-18 19:15:10 +0530865 port->cons.hvc = NULL;
866 return ret;
867 }
868 spin_lock_irq(&pdrvdata_lock);
869 pdrvdata.next_vtermno++;
870 list_add_tail(&port->cons.list, &pdrvdata.consoles);
871 spin_unlock_irq(&pdrvdata_lock);
Amit Shah3c7969c2009-11-26 11:25:38 +0530872 port->guest_connected = true;
Amit Shahcfa6d372010-01-18 19:15:10 +0530873
Amit Shah1d051602010-05-19 22:15:49 -0600874 /*
875 * Start using the new console output if this is the first
876 * console to come up.
877 */
878 if (early_put_chars)
879 early_put_chars = NULL;
880
Amit Shah2030fa42009-12-21 21:49:30 +0530881 /* Notify host of port being opened */
882 send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1);
883
Amit Shahcfa6d372010-01-18 19:15:10 +0530884 return 0;
885}
886
Amit Shah431edb82009-12-21 21:57:40 +0530887static ssize_t show_port_name(struct device *dev,
888 struct device_attribute *attr, char *buffer)
889{
890 struct port *port;
891
892 port = dev_get_drvdata(dev);
893
894 return sprintf(buffer, "%s\n", port->name);
895}
896
897static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL);
898
899static struct attribute *port_sysfs_entries[] = {
900 &dev_attr_name.attr,
901 NULL
902};
903
904static struct attribute_group port_attribute_group = {
905 .name = NULL, /* put in device directory */
906 .attrs = port_sysfs_entries,
907};
908
Amit Shahd99393e2009-12-21 22:36:21 +0530909static int debugfs_open(struct inode *inode, struct file *filp)
910{
911 filp->private_data = inode->i_private;
912 return 0;
913}
914
915static ssize_t debugfs_read(struct file *filp, char __user *ubuf,
916 size_t count, loff_t *offp)
917{
918 struct port *port;
919 char *buf;
920 ssize_t ret, out_offset, out_count;
921
922 out_count = 1024;
923 buf = kmalloc(out_count, GFP_KERNEL);
924 if (!buf)
925 return -ENOMEM;
926
927 port = filp->private_data;
928 out_offset = 0;
929 out_offset += snprintf(buf + out_offset, out_count,
930 "name: %s\n", port->name ? port->name : "");
931 out_offset += snprintf(buf + out_offset, out_count - out_offset,
932 "guest_connected: %d\n", port->guest_connected);
933 out_offset += snprintf(buf + out_offset, out_count - out_offset,
934 "host_connected: %d\n", port->host_connected);
935 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Amit Shahcdfadfc2010-05-19 22:15:50 -0600936 "outvq_full: %d\n", port->outvq_full);
937 out_offset += snprintf(buf + out_offset, out_count - out_offset,
Amit Shahd99393e2009-12-21 22:36:21 +0530938 "is_console: %s\n",
939 is_console_port(port) ? "yes" : "no");
940 out_offset += snprintf(buf + out_offset, out_count - out_offset,
941 "console_vtermno: %u\n", port->cons.vtermno);
942
943 ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset);
944 kfree(buf);
945 return ret;
946}
947
948static const struct file_operations port_debugfs_ops = {
949 .owner = THIS_MODULE,
950 .open = debugfs_open,
951 .read = debugfs_read,
952};
953
Amit Shah97788292010-05-06 02:05:08 +0530954static void set_console_size(struct port *port, u16 rows, u16 cols)
955{
956 if (!port || !is_console_port(port))
957 return;
958
959 port->cons.ws.ws_row = rows;
960 port->cons.ws.ws_col = cols;
961}
962
Amit Shahc446f8f2010-05-19 22:15:48 -0600963static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock)
964{
965 struct port_buffer *buf;
966 unsigned int nr_added_bufs;
967 int ret;
968
969 nr_added_bufs = 0;
970 do {
971 buf = alloc_buf(PAGE_SIZE);
972 if (!buf)
973 break;
974
975 spin_lock_irq(lock);
976 ret = add_inbuf(vq, buf);
977 if (ret < 0) {
978 spin_unlock_irq(lock);
979 free_buf(buf);
980 break;
981 }
982 nr_added_bufs++;
983 spin_unlock_irq(lock);
984 } while (ret > 0);
985
986 return nr_added_bufs;
987}
988
989static int add_port(struct ports_device *portdev, u32 id)
990{
991 char debugfs_name[16];
992 struct port *port;
993 struct port_buffer *buf;
994 dev_t devt;
995 unsigned int nr_added_bufs;
996 int err;
997
998 port = kmalloc(sizeof(*port), GFP_KERNEL);
999 if (!port) {
1000 err = -ENOMEM;
1001 goto fail;
1002 }
1003
1004 port->portdev = portdev;
1005 port->id = id;
1006
1007 port->name = NULL;
1008 port->inbuf = NULL;
1009 port->cons.hvc = NULL;
1010
Amit Shah97788292010-05-06 02:05:08 +05301011 port->cons.ws.ws_row = port->cons.ws.ws_col = 0;
1012
Amit Shahc446f8f2010-05-19 22:15:48 -06001013 port->host_connected = port->guest_connected = false;
1014
Amit Shahcdfadfc2010-05-19 22:15:50 -06001015 port->outvq_full = false;
1016
Amit Shahc446f8f2010-05-19 22:15:48 -06001017 port->in_vq = portdev->in_vqs[port->id];
1018 port->out_vq = portdev->out_vqs[port->id];
1019
1020 cdev_init(&port->cdev, &port_fops);
1021
1022 devt = MKDEV(portdev->chr_major, id);
1023 err = cdev_add(&port->cdev, devt, 1);
1024 if (err < 0) {
1025 dev_err(&port->portdev->vdev->dev,
1026 "Error %d adding cdev for port %u\n", err, id);
1027 goto free_port;
1028 }
1029 port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev,
1030 devt, port, "vport%up%u",
1031 port->portdev->drv_index, id);
1032 if (IS_ERR(port->dev)) {
1033 err = PTR_ERR(port->dev);
1034 dev_err(&port->portdev->vdev->dev,
1035 "Error %d creating device for port %u\n",
1036 err, id);
1037 goto free_cdev;
1038 }
1039
1040 spin_lock_init(&port->inbuf_lock);
Amit Shahcdfadfc2010-05-19 22:15:50 -06001041 spin_lock_init(&port->outvq_lock);
Amit Shahc446f8f2010-05-19 22:15:48 -06001042 init_waitqueue_head(&port->waitqueue);
1043
1044 /* Fill the in_vq with buffers so the host can send us data. */
1045 nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock);
1046 if (!nr_added_bufs) {
1047 dev_err(port->dev, "Error allocating inbufs\n");
1048 err = -ENOMEM;
1049 goto free_device;
1050 }
1051
1052 /*
1053 * If we're not using multiport support, this has to be a console port
1054 */
1055 if (!use_multiport(port->portdev)) {
1056 err = init_port_console(port);
1057 if (err)
1058 goto free_inbufs;
1059 }
1060
1061 spin_lock_irq(&portdev->ports_lock);
1062 list_add_tail(&port->list, &port->portdev->ports);
1063 spin_unlock_irq(&portdev->ports_lock);
1064
1065 /*
1066 * Tell the Host we're set so that it can send us various
1067 * configuration parameters for this port (eg, port name,
1068 * caching, whether this is a console port, etc.)
1069 */
1070 send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1);
1071
1072 if (pdrvdata.debugfs_dir) {
1073 /*
1074 * Finally, create the debugfs file that we can use to
1075 * inspect a port's state at any time
1076 */
1077 sprintf(debugfs_name, "vport%up%u",
1078 port->portdev->drv_index, id);
1079 port->debugfs_file = debugfs_create_file(debugfs_name, 0444,
1080 pdrvdata.debugfs_dir,
1081 port,
1082 &port_debugfs_ops);
1083 }
1084 return 0;
1085
1086free_inbufs:
1087 while ((buf = virtqueue_detach_unused_buf(port->in_vq)))
1088 free_buf(buf);
1089free_device:
1090 device_destroy(pdrvdata.class, port->dev->devt);
1091free_cdev:
1092 cdev_del(&port->cdev);
1093free_port:
1094 kfree(port);
1095fail:
1096 /* The host might want to notify management sw about port add failure */
Julia Lawall0643e4c2010-05-15 11:45:53 +02001097 __send_control_msg(portdev, id, VIRTIO_CONSOLE_PORT_READY, 0);
Amit Shahc446f8f2010-05-19 22:15:48 -06001098 return err;
1099}
1100
Amit Shah1f7aa422009-12-21 22:27:31 +05301101/* Remove all port-specific data. */
1102static int remove_port(struct port *port)
1103{
Amit Shaha9cdd482010-02-12 10:32:15 +05301104 struct port_buffer *buf;
1105
Amit Shah00476342010-05-27 13:24:39 +05301106 if (port->guest_connected) {
1107 port->guest_connected = false;
1108 port->host_connected = false;
1109 wake_up_interruptible(&port->waitqueue);
1110 send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0);
1111 }
1112
Amit Shah1f7aa422009-12-21 22:27:31 +05301113 spin_lock_irq(&port->portdev->ports_lock);
1114 list_del(&port->list);
1115 spin_unlock_irq(&port->portdev->ports_lock);
1116
1117 if (is_console_port(port)) {
1118 spin_lock_irq(&pdrvdata_lock);
1119 list_del(&port->cons.list);
1120 spin_unlock_irq(&pdrvdata_lock);
Amit Shah69eb9a92010-05-19 22:15:47 -06001121#if 0
1122 /*
1123 * hvc_remove() not called as removing one hvc port
1124 * results in other hvc ports getting frozen.
1125 *
1126 * Once this is resolved in hvc, this functionality
1127 * will be enabled. Till that is done, the -EPIPE
1128 * return from get_chars() above will help
1129 * hvc_console.c to clean up on ports we remove here.
1130 */
Amit Shah1f7aa422009-12-21 22:27:31 +05301131 hvc_remove(port->cons.hvc);
Amit Shah69eb9a92010-05-19 22:15:47 -06001132#endif
Amit Shah1f7aa422009-12-21 22:27:31 +05301133 }
Amit Shah1f7aa422009-12-21 22:27:31 +05301134 sysfs_remove_group(&port->dev->kobj, &port_attribute_group);
1135 device_destroy(pdrvdata.class, port->dev->devt);
1136 cdev_del(&port->cdev);
1137
Amit Shaha9cdd482010-02-12 10:32:15 +05301138 /* Remove unused data this port might have received. */
Amit Shah1f7aa422009-12-21 22:27:31 +05301139 discard_port_data(port);
Amit Shaha9cdd482010-02-12 10:32:15 +05301140
Amit Shahcdfadfc2010-05-19 22:15:50 -06001141 reclaim_consumed_buffers(port);
1142
Amit Shaha9cdd482010-02-12 10:32:15 +05301143 /* Remove buffers we queued up for the Host to send us data in. */
Michael S. Tsirkin505b0452010-04-12 16:18:32 +03001144 while ((buf = virtqueue_detach_unused_buf(port->in_vq)))
Amit Shaha9cdd482010-02-12 10:32:15 +05301145 free_buf(buf);
1146
Amit Shah1f7aa422009-12-21 22:27:31 +05301147 kfree(port->name);
1148
Amit Shahd99393e2009-12-21 22:36:21 +05301149 debugfs_remove(port->debugfs_file);
1150
Amit Shah1f7aa422009-12-21 22:27:31 +05301151 kfree(port);
1152 return 0;
1153}
1154
Amit Shah17634ba2009-12-21 21:03:25 +05301155/* Any private messages that the Host and Guest want to share */
1156static void handle_control_message(struct ports_device *portdev,
1157 struct port_buffer *buf)
1158{
1159 struct virtio_console_control *cpkt;
1160 struct port *port;
Amit Shah431edb82009-12-21 21:57:40 +05301161 size_t name_size;
1162 int err;
Amit Shah17634ba2009-12-21 21:03:25 +05301163
1164 cpkt = (struct virtio_console_control *)(buf->buf + buf->offset);
1165
1166 port = find_port_by_id(portdev, cpkt->id);
Amit Shahf909f852010-05-19 22:15:48 -06001167 if (!port && cpkt->event != VIRTIO_CONSOLE_PORT_ADD) {
Amit Shah17634ba2009-12-21 21:03:25 +05301168 /* No valid header at start of buffer. Drop it. */
1169 dev_dbg(&portdev->vdev->dev,
1170 "Invalid index %u in control packet\n", cpkt->id);
1171 return;
1172 }
1173
1174 switch (cpkt->event) {
Amit Shahf909f852010-05-19 22:15:48 -06001175 case VIRTIO_CONSOLE_PORT_ADD:
1176 if (port) {
Amit Shah1d051602010-05-19 22:15:49 -06001177 dev_dbg(&portdev->vdev->dev,
1178 "Port %u already added\n", port->id);
Amit Shahf909f852010-05-19 22:15:48 -06001179 send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1);
1180 break;
1181 }
1182 if (cpkt->id >= portdev->config.max_nr_ports) {
1183 dev_warn(&portdev->vdev->dev,
1184 "Request for adding port with out-of-bound id %u, max. supported id: %u\n",
1185 cpkt->id, portdev->config.max_nr_ports - 1);
1186 break;
1187 }
1188 add_port(portdev, cpkt->id);
1189 break;
1190 case VIRTIO_CONSOLE_PORT_REMOVE:
1191 remove_port(port);
1192 break;
Amit Shah17634ba2009-12-21 21:03:25 +05301193 case VIRTIO_CONSOLE_CONSOLE_PORT:
1194 if (!cpkt->value)
1195 break;
1196 if (is_console_port(port))
1197 break;
1198
1199 init_port_console(port);
1200 /*
1201 * Could remove the port here in case init fails - but
1202 * have to notify the host first.
1203 */
1204 break;
Amit Shah8345adb2010-05-06 02:05:09 +05301205 case VIRTIO_CONSOLE_RESIZE: {
1206 struct {
1207 __u16 rows;
1208 __u16 cols;
1209 } size;
1210
Amit Shah17634ba2009-12-21 21:03:25 +05301211 if (!is_console_port(port))
1212 break;
Amit Shah8345adb2010-05-06 02:05:09 +05301213
1214 memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt),
1215 sizeof(size));
1216 set_console_size(port, size.rows, size.cols);
1217
Amit Shah17634ba2009-12-21 21:03:25 +05301218 port->cons.hvc->irq_requested = 1;
1219 resize_console(port);
1220 break;
Amit Shah8345adb2010-05-06 02:05:09 +05301221 }
Amit Shah2030fa42009-12-21 21:49:30 +05301222 case VIRTIO_CONSOLE_PORT_OPEN:
1223 port->host_connected = cpkt->value;
1224 wake_up_interruptible(&port->waitqueue);
Amit Shahcdfadfc2010-05-19 22:15:50 -06001225 /*
1226 * If the host port got closed and the host had any
1227 * unconsumed buffers, we'll be able to reclaim them
1228 * now.
1229 */
1230 spin_lock_irq(&port->outvq_lock);
1231 reclaim_consumed_buffers(port);
1232 spin_unlock_irq(&port->outvq_lock);
Amit Shah2030fa42009-12-21 21:49:30 +05301233 break;
Amit Shah431edb82009-12-21 21:57:40 +05301234 case VIRTIO_CONSOLE_PORT_NAME:
1235 /*
1236 * Skip the size of the header and the cpkt to get the size
1237 * of the name that was sent
1238 */
1239 name_size = buf->len - buf->offset - sizeof(*cpkt) + 1;
1240
1241 port->name = kmalloc(name_size, GFP_KERNEL);
1242 if (!port->name) {
1243 dev_err(port->dev,
1244 "Not enough space to store port name\n");
1245 break;
1246 }
1247 strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt),
1248 name_size - 1);
1249 port->name[name_size - 1] = 0;
1250
1251 /*
1252 * Since we only have one sysfs attribute, 'name',
1253 * create it only if we have a name for the port.
1254 */
1255 err = sysfs_create_group(&port->dev->kobj,
1256 &port_attribute_group);
Amit Shahec642132010-03-19 17:36:43 +05301257 if (err) {
Amit Shah431edb82009-12-21 21:57:40 +05301258 dev_err(port->dev,
1259 "Error %d creating sysfs device attributes\n",
1260 err);
Amit Shahec642132010-03-19 17:36:43 +05301261 } else {
1262 /*
1263 * Generate a udev event so that appropriate
1264 * symlinks can be created based on udev
1265 * rules.
1266 */
1267 kobject_uevent(&port->dev->kobj, KOBJ_CHANGE);
1268 }
Amit Shah431edb82009-12-21 21:57:40 +05301269 break;
Amit Shah17634ba2009-12-21 21:03:25 +05301270 }
1271}
1272
1273static void control_work_handler(struct work_struct *work)
1274{
1275 struct ports_device *portdev;
1276 struct virtqueue *vq;
1277 struct port_buffer *buf;
1278 unsigned int len;
1279
1280 portdev = container_of(work, struct ports_device, control_work);
1281 vq = portdev->c_ivq;
1282
1283 spin_lock(&portdev->cvq_lock);
Michael S. Tsirkin505b0452010-04-12 16:18:32 +03001284 while ((buf = virtqueue_get_buf(vq, &len))) {
Amit Shah17634ba2009-12-21 21:03:25 +05301285 spin_unlock(&portdev->cvq_lock);
1286
1287 buf->len = len;
1288 buf->offset = 0;
1289
1290 handle_control_message(portdev, buf);
1291
1292 spin_lock(&portdev->cvq_lock);
1293 if (add_inbuf(portdev->c_ivq, buf) < 0) {
1294 dev_warn(&portdev->vdev->dev,
1295 "Error adding buffer to queue\n");
1296 free_buf(buf);
1297 }
1298 }
1299 spin_unlock(&portdev->cvq_lock);
1300}
1301
1302static void in_intr(struct virtqueue *vq)
1303{
1304 struct port *port;
1305 unsigned long flags;
1306
1307 port = find_port_by_vq(vq->vdev->priv, vq);
1308 if (!port)
1309 return;
1310
1311 spin_lock_irqsave(&port->inbuf_lock, flags);
Amit Shahd6933562010-02-12 10:32:18 +05301312 if (!port->inbuf)
1313 port->inbuf = get_inbuf(port);
Amit Shah17634ba2009-12-21 21:03:25 +05301314
Amit Shah88f251a2009-12-21 22:15:30 +05301315 /*
1316 * Don't queue up data when port is closed. This condition
1317 * can be reached when a console port is not yet connected (no
1318 * tty is spawned) and the host sends out data to console
1319 * ports. For generic serial ports, the host won't
1320 * (shouldn't) send data till the guest is connected.
1321 */
1322 if (!port->guest_connected)
1323 discard_port_data(port);
1324
Amit Shah17634ba2009-12-21 21:03:25 +05301325 spin_unlock_irqrestore(&port->inbuf_lock, flags);
1326
Amit Shah2030fa42009-12-21 21:49:30 +05301327 wake_up_interruptible(&port->waitqueue);
1328
Amit Shah17634ba2009-12-21 21:03:25 +05301329 if (is_console_port(port) && hvc_poll(port->cons.hvc))
1330 hvc_kick();
1331}
1332
1333static void control_intr(struct virtqueue *vq)
1334{
1335 struct ports_device *portdev;
1336
1337 portdev = vq->vdev->priv;
1338 schedule_work(&portdev->control_work);
1339}
1340
Amit Shah7f5d8102009-12-21 22:22:08 +05301341static void config_intr(struct virtio_device *vdev)
1342{
1343 struct ports_device *portdev;
1344
1345 portdev = vdev->priv;
Amit Shah99f905f2010-05-19 22:15:48 -06001346
Amit Shah4038f5b72010-05-06 02:05:07 +05301347 if (!use_multiport(portdev)) {
Amit Shah97788292010-05-06 02:05:08 +05301348 struct port *port;
1349 u16 rows, cols;
1350
1351 vdev->config->get(vdev,
1352 offsetof(struct virtio_console_config, cols),
1353 &cols, sizeof(u16));
1354 vdev->config->get(vdev,
1355 offsetof(struct virtio_console_config, rows),
1356 &rows, sizeof(u16));
1357
1358 port = find_port_by_id(portdev, 0);
1359 set_console_size(port, rows, cols);
1360
Amit Shah4038f5b72010-05-06 02:05:07 +05301361 /*
1362 * We'll use this way of resizing only for legacy
1363 * support. For newer userspace
1364 * (VIRTIO_CONSOLE_F_MULTPORT+), use control messages
1365 * to indicate console size changes so that it can be
1366 * done per-port.
1367 */
Amit Shah97788292010-05-06 02:05:08 +05301368 resize_console(port);
Amit Shah4038f5b72010-05-06 02:05:07 +05301369 }
Amit Shah7f5d8102009-12-21 22:22:08 +05301370}
1371
Amit Shah2658a79a2010-01-18 19:15:11 +05301372static int init_vqs(struct ports_device *portdev)
1373{
1374 vq_callback_t **io_callbacks;
1375 char **io_names;
1376 struct virtqueue **vqs;
Amit Shah17634ba2009-12-21 21:03:25 +05301377 u32 i, j, nr_ports, nr_queues;
Amit Shah2658a79a2010-01-18 19:15:11 +05301378 int err;
1379
Amit Shah17634ba2009-12-21 21:03:25 +05301380 nr_ports = portdev->config.max_nr_ports;
1381 nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2;
Amit Shah2658a79a2010-01-18 19:15:11 +05301382
1383 vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL);
1384 if (!vqs) {
1385 err = -ENOMEM;
1386 goto fail;
1387 }
1388 io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL);
1389 if (!io_callbacks) {
1390 err = -ENOMEM;
1391 goto free_vqs;
1392 }
1393 io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL);
1394 if (!io_names) {
1395 err = -ENOMEM;
1396 goto free_callbacks;
1397 }
1398 portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *),
1399 GFP_KERNEL);
1400 if (!portdev->in_vqs) {
1401 err = -ENOMEM;
1402 goto free_names;
1403 }
1404 portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *),
1405 GFP_KERNEL);
1406 if (!portdev->out_vqs) {
1407 err = -ENOMEM;
1408 goto free_invqs;
1409 }
1410
Amit Shah17634ba2009-12-21 21:03:25 +05301411 /*
1412 * For backward compat (newer host but older guest), the host
1413 * spawns a console port first and also inits the vqs for port
1414 * 0 before others.
1415 */
1416 j = 0;
1417 io_callbacks[j] = in_intr;
1418 io_callbacks[j + 1] = NULL;
1419 io_names[j] = "input";
1420 io_names[j + 1] = "output";
1421 j += 2;
Amit Shah2658a79a2010-01-18 19:15:11 +05301422
Amit Shah17634ba2009-12-21 21:03:25 +05301423 if (use_multiport(portdev)) {
1424 io_callbacks[j] = control_intr;
1425 io_callbacks[j + 1] = NULL;
1426 io_names[j] = "control-i";
1427 io_names[j + 1] = "control-o";
1428
1429 for (i = 1; i < nr_ports; i++) {
1430 j += 2;
1431 io_callbacks[j] = in_intr;
1432 io_callbacks[j + 1] = NULL;
1433 io_names[j] = "input";
1434 io_names[j + 1] = "output";
1435 }
1436 }
Amit Shah2658a79a2010-01-18 19:15:11 +05301437 /* Find the queues. */
1438 err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs,
1439 io_callbacks,
1440 (const char **)io_names);
1441 if (err)
1442 goto free_outvqs;
1443
Amit Shah17634ba2009-12-21 21:03:25 +05301444 j = 0;
Amit Shah2658a79a2010-01-18 19:15:11 +05301445 portdev->in_vqs[0] = vqs[0];
1446 portdev->out_vqs[0] = vqs[1];
Amit Shah17634ba2009-12-21 21:03:25 +05301447 j += 2;
1448 if (use_multiport(portdev)) {
1449 portdev->c_ivq = vqs[j];
1450 portdev->c_ovq = vqs[j + 1];
Amit Shah2658a79a2010-01-18 19:15:11 +05301451
Amit Shah17634ba2009-12-21 21:03:25 +05301452 for (i = 1; i < nr_ports; i++) {
1453 j += 2;
1454 portdev->in_vqs[i] = vqs[j];
1455 portdev->out_vqs[i] = vqs[j + 1];
1456 }
1457 }
Amit Shah2658a79a2010-01-18 19:15:11 +05301458 kfree(io_callbacks);
1459 kfree(io_names);
1460 kfree(vqs);
1461
1462 return 0;
1463
1464free_names:
1465 kfree(io_names);
1466free_callbacks:
1467 kfree(io_callbacks);
1468free_outvqs:
1469 kfree(portdev->out_vqs);
1470free_invqs:
1471 kfree(portdev->in_vqs);
1472free_vqs:
1473 kfree(vqs);
1474fail:
1475 return err;
1476}
1477
Amit Shahfb08bd22009-12-21 21:36:04 +05301478static const struct file_operations portdev_fops = {
1479 .owner = THIS_MODULE,
1480};
1481
Amit Shah1c85bf32010-01-18 19:15:07 +05301482/*
1483 * Once we're further in boot, we get probed like any other virtio
1484 * device.
Amit Shah17634ba2009-12-21 21:03:25 +05301485 *
1486 * If the host also supports multiple console ports, we check the
1487 * config space to see how many ports the host has spawned. We
1488 * initialize each port found.
Amit Shah1c85bf32010-01-18 19:15:07 +05301489 */
1490static int __devinit virtcons_probe(struct virtio_device *vdev)
1491{
Amit Shah1c85bf32010-01-18 19:15:07 +05301492 struct ports_device *portdev;
1493 int err;
Amit Shah17634ba2009-12-21 21:03:25 +05301494 bool multiport;
Amit Shah1c85bf32010-01-18 19:15:07 +05301495
1496 portdev = kmalloc(sizeof(*portdev), GFP_KERNEL);
1497 if (!portdev) {
1498 err = -ENOMEM;
1499 goto fail;
1500 }
1501
1502 /* Attach this portdev to this virtio_device, and vice-versa. */
1503 portdev->vdev = vdev;
1504 vdev->priv = portdev;
1505
Amit Shahfb08bd22009-12-21 21:36:04 +05301506 spin_lock_irq(&pdrvdata_lock);
1507 portdev->drv_index = pdrvdata.index++;
1508 spin_unlock_irq(&pdrvdata_lock);
1509
1510 portdev->chr_major = register_chrdev(0, "virtio-portsdev",
1511 &portdev_fops);
1512 if (portdev->chr_major < 0) {
1513 dev_err(&vdev->dev,
1514 "Error %d registering chrdev for device %u\n",
1515 portdev->chr_major, portdev->drv_index);
1516 err = portdev->chr_major;
1517 goto free;
1518 }
1519
Amit Shah17634ba2009-12-21 21:03:25 +05301520 multiport = false;
Amit Shah17634ba2009-12-21 21:03:25 +05301521 portdev->config.max_nr_ports = 1;
1522 if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) {
1523 multiport = true;
1524 vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT;
1525
Amit Shahb99fa812010-05-19 22:15:46 -06001526 vdev->config->get(vdev, offsetof(struct virtio_console_config,
Amit Shahb99fa812010-05-19 22:15:46 -06001527 max_nr_ports),
Amit Shah17634ba2009-12-21 21:03:25 +05301528 &portdev->config.max_nr_ports,
1529 sizeof(portdev->config.max_nr_ports));
Amit Shah17634ba2009-12-21 21:03:25 +05301530 }
1531
1532 /* Let the Host know we support multiple ports.*/
1533 vdev->config->finalize_features(vdev);
1534
Amit Shah2658a79a2010-01-18 19:15:11 +05301535 err = init_vqs(portdev);
1536 if (err < 0) {
1537 dev_err(&vdev->dev, "Error %d initializing vqs\n", err);
Amit Shahfb08bd22009-12-21 21:36:04 +05301538 goto free_chrdev;
Amit Shah2658a79a2010-01-18 19:15:11 +05301539 }
Amit Shah1c85bf32010-01-18 19:15:07 +05301540
Amit Shah17634ba2009-12-21 21:03:25 +05301541 spin_lock_init(&portdev->ports_lock);
1542 INIT_LIST_HEAD(&portdev->ports);
1543
1544 if (multiport) {
Amit Shah335a64a5c2010-02-24 10:37:44 +05301545 unsigned int nr_added_bufs;
1546
Amit Shah17634ba2009-12-21 21:03:25 +05301547 spin_lock_init(&portdev->cvq_lock);
1548 INIT_WORK(&portdev->control_work, &control_work_handler);
1549
Amit Shah335a64a5c2010-02-24 10:37:44 +05301550 nr_added_bufs = fill_queue(portdev->c_ivq, &portdev->cvq_lock);
1551 if (!nr_added_bufs) {
Amit Shah22a29ea2010-02-12 10:32:17 +05301552 dev_err(&vdev->dev,
1553 "Error allocating buffers for control queue\n");
1554 err = -ENOMEM;
1555 goto free_vqs;
1556 }
Amit Shah1d051602010-05-19 22:15:49 -06001557 } else {
1558 /*
1559 * For backward compatibility: Create a console port
1560 * if we're running on older host.
1561 */
1562 add_port(portdev, 0);
Amit Shah17634ba2009-12-21 21:03:25 +05301563 }
1564
Amit Shahf909f852010-05-19 22:15:48 -06001565 __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID,
1566 VIRTIO_CONSOLE_DEVICE_READY, 1);
Rusty Russell31610432007-10-22 11:03:39 +10001567 return 0;
1568
Amit Shah22a29ea2010-02-12 10:32:17 +05301569free_vqs:
Julia Lawall0643e4c2010-05-15 11:45:53 +02001570 /* The host might want to notify mgmt sw about device add failure */
1571 __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID,
1572 VIRTIO_CONSOLE_DEVICE_READY, 0);
Amit Shah22a29ea2010-02-12 10:32:17 +05301573 vdev->config->del_vqs(vdev);
1574 kfree(portdev->in_vqs);
1575 kfree(portdev->out_vqs);
Amit Shahfb08bd22009-12-21 21:36:04 +05301576free_chrdev:
1577 unregister_chrdev(portdev->chr_major, "virtio-portsdev");
Rusty Russell31610432007-10-22 11:03:39 +10001578free:
Amit Shah1c85bf32010-01-18 19:15:07 +05301579 kfree(portdev);
Rusty Russell31610432007-10-22 11:03:39 +10001580fail:
1581 return err;
1582}
1583
Amit Shah71778762010-02-12 10:32:16 +05301584static void virtcons_remove(struct virtio_device *vdev)
1585{
1586 struct ports_device *portdev;
1587 struct port *port, *port2;
1588 struct port_buffer *buf;
1589 unsigned int len;
1590
1591 portdev = vdev->priv;
1592
1593 cancel_work_sync(&portdev->control_work);
Amit Shah71778762010-02-12 10:32:16 +05301594
1595 list_for_each_entry_safe(port, port2, &portdev->ports, list)
1596 remove_port(port);
1597
1598 unregister_chrdev(portdev->chr_major, "virtio-portsdev");
1599
Michael S. Tsirkin505b0452010-04-12 16:18:32 +03001600 while ((buf = virtqueue_get_buf(portdev->c_ivq, &len)))
Amit Shah71778762010-02-12 10:32:16 +05301601 free_buf(buf);
1602
Michael S. Tsirkin505b0452010-04-12 16:18:32 +03001603 while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq)))
Amit Shah71778762010-02-12 10:32:16 +05301604 free_buf(buf);
1605
1606 vdev->config->del_vqs(vdev);
1607 kfree(portdev->in_vqs);
1608 kfree(portdev->out_vqs);
1609
1610 kfree(portdev);
1611}
1612
Rusty Russell31610432007-10-22 11:03:39 +10001613static struct virtio_device_id id_table[] = {
1614 { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID },
1615 { 0 },
1616};
1617
Christian Borntraegerc2983452008-11-25 13:36:26 +01001618static unsigned int features[] = {
1619 VIRTIO_CONSOLE_F_SIZE,
Amit Shahb99fa812010-05-19 22:15:46 -06001620 VIRTIO_CONSOLE_F_MULTIPORT,
Christian Borntraegerc2983452008-11-25 13:36:26 +01001621};
1622
Rusty Russell31610432007-10-22 11:03:39 +10001623static struct virtio_driver virtio_console = {
Christian Borntraegerc2983452008-11-25 13:36:26 +01001624 .feature_table = features,
1625 .feature_table_size = ARRAY_SIZE(features),
Rusty Russell31610432007-10-22 11:03:39 +10001626 .driver.name = KBUILD_MODNAME,
1627 .driver.owner = THIS_MODULE,
1628 .id_table = id_table,
1629 .probe = virtcons_probe,
Amit Shah71778762010-02-12 10:32:16 +05301630 .remove = virtcons_remove,
Amit Shah7f5d8102009-12-21 22:22:08 +05301631 .config_changed = config_intr,
Rusty Russell31610432007-10-22 11:03:39 +10001632};
1633
1634static int __init init(void)
1635{
Amit Shahfb08bd22009-12-21 21:36:04 +05301636 int err;
1637
1638 pdrvdata.class = class_create(THIS_MODULE, "virtio-ports");
1639 if (IS_ERR(pdrvdata.class)) {
1640 err = PTR_ERR(pdrvdata.class);
1641 pr_err("Error %d creating virtio-ports class\n", err);
1642 return err;
1643 }
Amit Shahd99393e2009-12-21 22:36:21 +05301644
1645 pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL);
1646 if (!pdrvdata.debugfs_dir) {
1647 pr_warning("Error %ld creating debugfs dir for virtio-ports\n",
1648 PTR_ERR(pdrvdata.debugfs_dir));
1649 }
Amit Shah38edf582010-01-18 19:15:05 +05301650 INIT_LIST_HEAD(&pdrvdata.consoles);
1651
Rusty Russell31610432007-10-22 11:03:39 +10001652 return register_virtio_driver(&virtio_console);
1653}
Amit Shah71778762010-02-12 10:32:16 +05301654
1655static void __exit fini(void)
1656{
1657 unregister_virtio_driver(&virtio_console);
1658
1659 class_destroy(pdrvdata.class);
1660 if (pdrvdata.debugfs_dir)
1661 debugfs_remove_recursive(pdrvdata.debugfs_dir);
1662}
Rusty Russell31610432007-10-22 11:03:39 +10001663module_init(init);
Amit Shah71778762010-02-12 10:32:16 +05301664module_exit(fini);
Rusty Russell31610432007-10-22 11:03:39 +10001665
1666MODULE_DEVICE_TABLE(virtio, id_table);
1667MODULE_DESCRIPTION("Virtio console driver");
1668MODULE_LICENSE("GPL");