Rusty Russell | a23ea92 | 2010-01-18 19:14:55 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006, 2007, 2009 Rusty Russell, IBM Corporation |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 3 | * Copyright (C) 2009, 2010 Red Hat, Inc. |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 4 | * |
| 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 Shah | fb08bd2 | 2009-12-21 21:36:04 +0530 | [diff] [blame] | 19 | #include <linux/cdev.h> |
Amit Shah | d99393e | 2009-12-21 22:36:21 +0530 | [diff] [blame] | 20 | #include <linux/debugfs.h> |
Amit Shah | fb08bd2 | 2009-12-21 21:36:04 +0530 | [diff] [blame] | 21 | #include <linux/device.h> |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 22 | #include <linux/err.h> |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 23 | #include <linux/fs.h> |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 24 | #include <linux/init.h> |
Amit Shah | 38edf58 | 2010-01-18 19:15:05 +0530 | [diff] [blame] | 25 | #include <linux/list.h> |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 26 | #include <linux/poll.h> |
| 27 | #include <linux/sched.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 28 | #include <linux/slab.h> |
Amit Shah | 38edf58 | 2010-01-18 19:15:05 +0530 | [diff] [blame] | 29 | #include <linux/spinlock.h> |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 30 | #include <linux/virtio.h> |
| 31 | #include <linux/virtio_console.h> |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 32 | #include <linux/wait.h> |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 33 | #include <linux/workqueue.h> |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 34 | #include "hvc_console.h" |
| 35 | |
Amit Shah | 38edf58 | 2010-01-18 19:15:05 +0530 | [diff] [blame] | 36 | /* |
| 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 | */ |
| 44 | struct ports_driver_data { |
Amit Shah | fb08bd2 | 2009-12-21 21:36:04 +0530 | [diff] [blame] | 45 | /* Used for registering chardevs */ |
| 46 | struct class *class; |
| 47 | |
Amit Shah | d99393e | 2009-12-21 22:36:21 +0530 | [diff] [blame] | 48 | /* Used for exporting per-port information to debugfs */ |
| 49 | struct dentry *debugfs_dir; |
| 50 | |
Amit Shah | fb08bd2 | 2009-12-21 21:36:04 +0530 | [diff] [blame] | 51 | /* Number of devices this driver is handling */ |
| 52 | unsigned int index; |
| 53 | |
Rusty Russell | d8a02bd | 2010-01-18 19:15:06 +0530 | [diff] [blame] | 54 | /* |
| 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 Shah | 38edf58 | 2010-01-18 19:15:05 +0530 | [diff] [blame] | 66 | /* All the console devices handled by this driver */ |
| 67 | struct list_head consoles; |
| 68 | }; |
| 69 | static struct ports_driver_data pdrvdata; |
| 70 | |
| 71 | DEFINE_SPINLOCK(pdrvdata_lock); |
| 72 | |
Amit Shah | 4f23c57 | 2010-01-18 19:15:09 +0530 | [diff] [blame] | 73 | /* This struct holds information that's relevant only for console ports */ |
| 74 | struct 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 Shah | 9778829 | 2010-05-06 02:05:08 +0530 | [diff] [blame] | 81 | /* The size of the console */ |
| 82 | struct winsize ws; |
| 83 | |
Amit Shah | 4f23c57 | 2010-01-18 19:15:09 +0530 | [diff] [blame] | 84 | /* |
| 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 Shah | fdb9a05 | 2010-01-18 19:15:01 +0530 | [diff] [blame] | 94 | struct 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 Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 106 | /* |
| 107 | * This is a per-device struct that stores data common to all the |
| 108 | * ports for that device (vdev->priv). |
| 109 | */ |
| 110 | struct 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 Shah | b99fa81 | 2010-05-19 22:15:46 -0600 | [diff] [blame] | 126 | struct virtio_console_config config; |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 127 | |
| 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 Shah | fb08bd2 | 2009-12-21 21:36:04 +0530 | [diff] [blame] | 139 | |
| 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 Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 145 | }; |
| 146 | |
Amit Shah | 1c85bf3 | 2010-01-18 19:15:07 +0530 | [diff] [blame] | 147 | /* This struct holds the per-port data */ |
Rusty Russell | 21206ed | 2010-01-18 19:15:00 +0530 | [diff] [blame] | 148 | struct port { |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 149 | /* Next port in the list, head is in the ports_device */ |
| 150 | struct list_head list; |
| 151 | |
Amit Shah | 1c85bf3 | 2010-01-18 19:15:07 +0530 | [diff] [blame] | 152 | /* Pointer to the parent virtio_console device */ |
| 153 | struct ports_device *portdev; |
Amit Shah | fdb9a05 | 2010-01-18 19:15:01 +0530 | [diff] [blame] | 154 | |
| 155 | /* The current buffer from which data has to be fed to readers */ |
| 156 | struct port_buffer *inbuf; |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 157 | |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 158 | /* |
| 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 Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 165 | /* Protect the operations on the out_vq. */ |
| 166 | spinlock_t outvq_lock; |
| 167 | |
Amit Shah | 1c85bf3 | 2010-01-18 19:15:07 +0530 | [diff] [blame] | 168 | /* The IO vqs for this port */ |
| 169 | struct virtqueue *in_vq, *out_vq; |
| 170 | |
Amit Shah | d99393e | 2009-12-21 22:36:21 +0530 | [diff] [blame] | 171 | /* File in the debugfs directory that exposes this port's information */ |
| 172 | struct dentry *debugfs_file; |
| 173 | |
Amit Shah | 4f23c57 | 2010-01-18 19:15:09 +0530 | [diff] [blame] | 174 | /* |
| 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 Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 179 | |
Amit Shah | fb08bd2 | 2009-12-21 21:36:04 +0530 | [diff] [blame] | 180 | /* Each port associates with a separate char device */ |
| 181 | struct cdev cdev; |
| 182 | struct device *dev; |
| 183 | |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 184 | /* A waitqueue for poll() or blocking read operations */ |
| 185 | wait_queue_head_t waitqueue; |
| 186 | |
Amit Shah | 431edb8 | 2009-12-21 21:57:40 +0530 | [diff] [blame] | 187 | /* The 'name' of the port that we expose via sysfs properties */ |
| 188 | char *name; |
| 189 | |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 190 | /* The 'id' to identify the port with the Host */ |
| 191 | u32 id; |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 192 | |
Amit Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 193 | bool outvq_full; |
| 194 | |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 195 | /* Is the host device open */ |
| 196 | bool host_connected; |
Amit Shah | 3c7969c | 2009-11-26 11:25:38 +0530 | [diff] [blame] | 197 | |
| 198 | /* We should allow only one process to open a port */ |
| 199 | bool guest_connected; |
Rusty Russell | 21206ed | 2010-01-18 19:15:00 +0530 | [diff] [blame] | 200 | }; |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 201 | |
Rusty Russell | 971f339 | 2010-01-18 19:14:56 +0530 | [diff] [blame] | 202 | /* This is the very early arch-specified put chars function. */ |
| 203 | static int (*early_put_chars)(u32, const char *, int); |
| 204 | |
Amit Shah | 38edf58 | 2010-01-18 19:15:05 +0530 | [diff] [blame] | 205 | static struct port *find_port_by_vtermno(u32 vtermno) |
| 206 | { |
| 207 | struct port *port; |
Amit Shah | 4f23c57 | 2010-01-18 19:15:09 +0530 | [diff] [blame] | 208 | struct console *cons; |
Amit Shah | 38edf58 | 2010-01-18 19:15:05 +0530 | [diff] [blame] | 209 | unsigned long flags; |
| 210 | |
| 211 | spin_lock_irqsave(&pdrvdata_lock, flags); |
Amit Shah | 4f23c57 | 2010-01-18 19:15:09 +0530 | [diff] [blame] | 212 | list_for_each_entry(cons, &pdrvdata.consoles, list) { |
| 213 | if (cons->vtermno == vtermno) { |
| 214 | port = container_of(cons, struct port, cons); |
Amit Shah | 38edf58 | 2010-01-18 19:15:05 +0530 | [diff] [blame] | 215 | goto out; |
Amit Shah | 4f23c57 | 2010-01-18 19:15:09 +0530 | [diff] [blame] | 216 | } |
Amit Shah | 38edf58 | 2010-01-18 19:15:05 +0530 | [diff] [blame] | 217 | } |
| 218 | port = NULL; |
| 219 | out: |
| 220 | spin_unlock_irqrestore(&pdrvdata_lock, flags); |
| 221 | return port; |
| 222 | } |
| 223 | |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 224 | static 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; |
| 234 | out: |
| 235 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
| 236 | |
| 237 | return port; |
| 238 | } |
| 239 | |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 240 | static struct port *find_port_by_vq(struct ports_device *portdev, |
| 241 | struct virtqueue *vq) |
| 242 | { |
| 243 | struct port *port; |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 244 | unsigned long flags; |
| 245 | |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 246 | spin_lock_irqsave(&portdev->ports_lock, flags); |
| 247 | list_for_each_entry(port, &portdev->ports, list) |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 248 | if (port->in_vq == vq || port->out_vq == vq) |
| 249 | goto out; |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 250 | port = NULL; |
| 251 | out: |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 252 | spin_unlock_irqrestore(&portdev->ports_lock, flags); |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 253 | return port; |
| 254 | } |
| 255 | |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 256 | static bool is_console_port(struct port *port) |
| 257 | { |
| 258 | if (port->cons.hvc) |
| 259 | return true; |
| 260 | return false; |
| 261 | } |
| 262 | |
| 263 | static 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 Shah | fdb9a05 | 2010-01-18 19:15:01 +0530 | [diff] [blame] | 274 | static void free_buf(struct port_buffer *buf) |
| 275 | { |
| 276 | kfree(buf->buf); |
| 277 | kfree(buf); |
| 278 | } |
| 279 | |
| 280 | static 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 | |
| 295 | free_buf: |
| 296 | kfree(buf); |
| 297 | fail: |
| 298 | return NULL; |
| 299 | } |
| 300 | |
Amit Shah | a3cde44 | 2010-01-18 19:15:03 +0530 | [diff] [blame] | 301 | /* Callers should take appropriate locks */ |
| 302 | static 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. Tsirkin | 505b045 | 2010-04-12 16:18:32 +0300 | [diff] [blame] | 309 | buf = virtqueue_get_buf(vq, &len); |
Amit Shah | a3cde44 | 2010-01-18 19:15:03 +0530 | [diff] [blame] | 310 | if (buf) { |
| 311 | buf->len = len; |
| 312 | buf->offset = 0; |
| 313 | } |
| 314 | return buf; |
| 315 | } |
| 316 | |
Rusty Russell | a23ea92 | 2010-01-18 19:14:55 +0530 | [diff] [blame] | 317 | /* |
Amit Shah | e27b519 | 2010-01-18 19:15:02 +0530 | [diff] [blame] | 318 | * 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 Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 323 | static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
Amit Shah | e27b519 | 2010-01-18 19:15:02 +0530 | [diff] [blame] | 324 | { |
| 325 | struct scatterlist sg[1]; |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 326 | int ret; |
Amit Shah | 1c85bf3 | 2010-01-18 19:15:07 +0530 | [diff] [blame] | 327 | |
Amit Shah | e27b519 | 2010-01-18 19:15:02 +0530 | [diff] [blame] | 328 | sg_init_one(sg, buf->buf, buf->size); |
| 329 | |
Michael S. Tsirkin | 505b045 | 2010-04-12 16:18:32 +0300 | [diff] [blame] | 330 | ret = virtqueue_add_buf(vq, sg, 0, 1, buf); |
| 331 | virtqueue_kick(vq); |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 332 | return ret; |
| 333 | } |
| 334 | |
Amit Shah | 88f251a | 2009-12-21 22:15:30 +0530 | [diff] [blame] | 335 | /* Discard any unread data this port has. Callers lockers. */ |
| 336 | static void discard_port_data(struct port *port) |
| 337 | { |
| 338 | struct port_buffer *buf; |
| 339 | struct virtqueue *vq; |
| 340 | unsigned int len; |
Amit Shah | d693356 | 2010-02-12 10:32:18 +0530 | [diff] [blame] | 341 | int ret; |
Amit Shah | 88f251a | 2009-12-21 22:15:30 +0530 | [diff] [blame] | 342 | |
| 343 | vq = port->in_vq; |
| 344 | if (port->inbuf) |
| 345 | buf = port->inbuf; |
| 346 | else |
Michael S. Tsirkin | 505b045 | 2010-04-12 16:18:32 +0300 | [diff] [blame] | 347 | buf = virtqueue_get_buf(vq, &len); |
Amit Shah | 88f251a | 2009-12-21 22:15:30 +0530 | [diff] [blame] | 348 | |
Amit Shah | d693356 | 2010-02-12 10:32:18 +0530 | [diff] [blame] | 349 | ret = 0; |
| 350 | while (buf) { |
| 351 | if (add_inbuf(vq, buf) < 0) { |
| 352 | ret++; |
| 353 | free_buf(buf); |
| 354 | } |
Michael S. Tsirkin | 505b045 | 2010-04-12 16:18:32 +0300 | [diff] [blame] | 355 | buf = virtqueue_get_buf(vq, &len); |
Amit Shah | 88f251a | 2009-12-21 22:15:30 +0530 | [diff] [blame] | 356 | } |
Amit Shah | 88f251a | 2009-12-21 22:15:30 +0530 | [diff] [blame] | 357 | port->inbuf = NULL; |
Amit Shah | d693356 | 2010-02-12 10:32:18 +0530 | [diff] [blame] | 358 | if (ret) |
| 359 | dev_warn(port->dev, "Errors adding %d buffers back to vq\n", |
| 360 | ret); |
Amit Shah | 88f251a | 2009-12-21 22:15:30 +0530 | [diff] [blame] | 361 | } |
| 362 | |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 363 | static bool port_has_data(struct port *port) |
| 364 | { |
| 365 | unsigned long flags; |
| 366 | bool ret; |
| 367 | |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 368 | spin_lock_irqsave(&port->inbuf_lock, flags); |
Amit Shah | d693356 | 2010-02-12 10:32:18 +0530 | [diff] [blame] | 369 | if (port->inbuf) { |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 370 | ret = true; |
Amit Shah | d693356 | 2010-02-12 10:32:18 +0530 | [diff] [blame] | 371 | goto out; |
| 372 | } |
| 373 | port->inbuf = get_inbuf(port); |
| 374 | if (port->inbuf) { |
| 375 | ret = true; |
| 376 | goto out; |
| 377 | } |
| 378 | ret = false; |
| 379 | out: |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 380 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 381 | return ret; |
| 382 | } |
| 383 | |
Amit Shah | 3425e70 | 2010-05-19 22:15:46 -0600 | [diff] [blame] | 384 | static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, |
| 385 | unsigned int event, unsigned int value) |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 386 | { |
| 387 | struct scatterlist sg[1]; |
| 388 | struct virtio_console_control cpkt; |
| 389 | struct virtqueue *vq; |
Amit Shah | 604b2ad | 2010-02-24 10:36:51 +0530 | [diff] [blame] | 390 | unsigned int len; |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 391 | |
Amit Shah | 3425e70 | 2010-05-19 22:15:46 -0600 | [diff] [blame] | 392 | if (!use_multiport(portdev)) |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 393 | return 0; |
| 394 | |
Amit Shah | 3425e70 | 2010-05-19 22:15:46 -0600 | [diff] [blame] | 395 | cpkt.id = port_id; |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 396 | cpkt.event = event; |
| 397 | cpkt.value = value; |
| 398 | |
Amit Shah | 3425e70 | 2010-05-19 22:15:46 -0600 | [diff] [blame] | 399 | vq = portdev->c_ovq; |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 400 | |
| 401 | sg_init_one(sg, &cpkt, sizeof(cpkt)); |
Michael S. Tsirkin | 505b045 | 2010-04-12 16:18:32 +0300 | [diff] [blame] | 402 | if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt) >= 0) { |
| 403 | virtqueue_kick(vq); |
| 404 | while (!virtqueue_get_buf(vq, &len)) |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 405 | cpu_relax(); |
| 406 | } |
| 407 | return 0; |
| 408 | } |
| 409 | |
Amit Shah | 3425e70 | 2010-05-19 22:15:46 -0600 | [diff] [blame] | 410 | static 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 Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 416 | /* Callers must take the port->outvq_lock */ |
| 417 | static 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 | |
| 428 | static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count, |
| 429 | bool nonblock) |
Amit Shah | f997f00b | 2009-12-21 17:28:51 +0530 | [diff] [blame] | 430 | { |
| 431 | struct scatterlist sg[1]; |
| 432 | struct virtqueue *out_vq; |
| 433 | ssize_t ret; |
Amit Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 434 | unsigned long flags; |
Amit Shah | f997f00b | 2009-12-21 17:28:51 +0530 | [diff] [blame] | 435 | unsigned int len; |
| 436 | |
| 437 | out_vq = port->out_vq; |
| 438 | |
Amit Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 439 | spin_lock_irqsave(&port->outvq_lock, flags); |
| 440 | |
| 441 | reclaim_consumed_buffers(port); |
| 442 | |
Amit Shah | f997f00b | 2009-12-21 17:28:51 +0530 | [diff] [blame] | 443 | sg_init_one(sg, in_buf, in_count); |
Michael S. Tsirkin | 505b045 | 2010-04-12 16:18:32 +0300 | [diff] [blame] | 444 | ret = virtqueue_add_buf(out_vq, sg, 1, 0, in_buf); |
Amit Shah | f997f00b | 2009-12-21 17:28:51 +0530 | [diff] [blame] | 445 | |
| 446 | /* Tell Host to go! */ |
Michael S. Tsirkin | 505b045 | 2010-04-12 16:18:32 +0300 | [diff] [blame] | 447 | virtqueue_kick(out_vq); |
Amit Shah | f997f00b | 2009-12-21 17:28:51 +0530 | [diff] [blame] | 448 | |
| 449 | if (ret < 0) { |
Rusty Russell | 9ff4cfa | 2010-04-08 09:46:16 -0600 | [diff] [blame] | 450 | in_count = 0; |
Amit Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 451 | goto done; |
Amit Shah | f997f00b | 2009-12-21 17:28:51 +0530 | [diff] [blame] | 452 | } |
| 453 | |
Amit Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 454 | 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. Tsirkin | 505b045 | 2010-04-12 16:18:32 +0300 | [diff] [blame] | 466 | while (!virtqueue_get_buf(out_vq, &len)) |
Amit Shah | f997f00b | 2009-12-21 17:28:51 +0530 | [diff] [blame] | 467 | cpu_relax(); |
Amit Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 468 | done: |
| 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 Russell | 9ff4cfa | 2010-04-08 09:46:16 -0600 | [diff] [blame] | 474 | return in_count; |
Amit Shah | f997f00b | 2009-12-21 17:28:51 +0530 | [diff] [blame] | 475 | } |
| 476 | |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 477 | /* |
| 478 | * Give out the data that's requested from the buffer that we have |
| 479 | * queued up. |
| 480 | */ |
Amit Shah | b766cee | 2009-12-21 21:26:45 +0530 | [diff] [blame] | 481 | static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
| 482 | bool to_user) |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 483 | { |
| 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 Shah | b766cee | 2009-12-21 21:26:45 +0530 | [diff] [blame] | 491 | out_count = min(out_count, buf->len - buf->offset); |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 492 | |
Amit Shah | b766cee | 2009-12-21 21:26:45 +0530 | [diff] [blame] | 493 | if (to_user) { |
| 494 | ssize_t ret; |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 495 | |
Amit Shah | b766cee | 2009-12-21 21:26:45 +0530 | [diff] [blame] | 496 | 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 Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 503 | 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 Shah | fb08bd2 | 2009-12-21 21:36:04 +0530 | [diff] [blame] | 514 | dev_warn(port->dev, "failed add_buf\n"); |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 515 | |
| 516 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
| 517 | } |
Amit Shah | b766cee | 2009-12-21 21:26:45 +0530 | [diff] [blame] | 518 | /* Return the number of bytes actually copied */ |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 519 | return out_count; |
Amit Shah | e27b519 | 2010-01-18 19:15:02 +0530 | [diff] [blame] | 520 | } |
| 521 | |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 522 | /* The condition that must be true for polling to end */ |
Amit Shah | 60caacd | 2010-05-19 22:15:49 -0600 | [diff] [blame] | 523 | static bool will_read_block(struct port *port) |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 524 | { |
Amit Shah | 60caacd | 2010-05-19 22:15:49 -0600 | [diff] [blame] | 525 | return !port_has_data(port) && port->host_connected; |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 526 | } |
| 527 | |
Amit Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 528 | static 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 Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 547 | static 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 Shah | 60caacd | 2010-05-19 22:15:49 -0600 | [diff] [blame] | 567 | !will_read_block(port)); |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 568 | 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 | |
| 587 | static 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 Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 593 | bool nonblock; |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 594 | |
| 595 | port = filp->private_data; |
| 596 | |
Amit Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 597 | 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 Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 609 | 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 Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 621 | ret = send_buf(port, buf, count, nonblock); |
| 622 | |
| 623 | if (nonblock && ret > 0) |
| 624 | goto out; |
| 625 | |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 626 | free_buf: |
| 627 | kfree(buf); |
Amit Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 628 | out: |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 629 | return ret; |
| 630 | } |
| 631 | |
| 632 | static 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 Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 643 | if (!will_write_block(port)) |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 644 | ret |= POLLOUT; |
| 645 | if (!port->host_connected) |
| 646 | ret |= POLLHUP; |
| 647 | |
| 648 | return ret; |
| 649 | } |
| 650 | |
| 651 | static 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 Shah | 88f251a | 2009-12-21 22:15:30 +0530 | [diff] [blame] | 660 | spin_lock_irq(&port->inbuf_lock); |
Amit Shah | 3c7969c | 2009-11-26 11:25:38 +0530 | [diff] [blame] | 661 | port->guest_connected = false; |
| 662 | |
Amit Shah | 88f251a | 2009-12-21 22:15:30 +0530 | [diff] [blame] | 663 | discard_port_data(port); |
| 664 | |
| 665 | spin_unlock_irq(&port->inbuf_lock); |
| 666 | |
Amit Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 667 | spin_lock_irq(&port->outvq_lock); |
| 668 | reclaim_consumed_buffers(port); |
| 669 | spin_unlock_irq(&port->outvq_lock); |
| 670 | |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 671 | return 0; |
| 672 | } |
| 673 | |
| 674 | static 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 Shah | 3c7969c | 2009-11-26 11:25:38 +0530 | [diff] [blame] | 689 | /* 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 Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 699 | 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 Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 708 | /* 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 | */ |
| 720 | static 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 Shah | e27b519 | 2010-01-18 19:15:02 +0530 | [diff] [blame] | 729 | /* |
Rusty Russell | a23ea92 | 2010-01-18 19:14:55 +0530 | [diff] [blame] | 730 | * The put_chars() callback is pretty straightforward. |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 731 | * |
Rusty Russell | a23ea92 | 2010-01-18 19:14:55 +0530 | [diff] [blame] | 732 | * 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 Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 737 | static int put_chars(u32 vtermno, const char *buf, int count) |
| 738 | { |
Rusty Russell | 21206ed | 2010-01-18 19:15:00 +0530 | [diff] [blame] | 739 | struct port *port; |
Amit Shah | 38edf58 | 2010-01-18 19:15:05 +0530 | [diff] [blame] | 740 | |
François Diakhaté | 162a689 | 2010-03-23 18:23:15 +0530 | [diff] [blame] | 741 | if (unlikely(early_put_chars)) |
| 742 | return early_put_chars(vtermno, buf, count); |
| 743 | |
Amit Shah | 38edf58 | 2010-01-18 19:15:05 +0530 | [diff] [blame] | 744 | port = find_port_by_vtermno(vtermno); |
| 745 | if (!port) |
Amit Shah | 6dc69f9 | 2010-05-19 22:15:47 -0600 | [diff] [blame] | 746 | return -EPIPE; |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 747 | |
Amit Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 748 | return send_buf(port, (void *)buf, count, false); |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 749 | } |
| 750 | |
Rusty Russell | a23ea92 | 2010-01-18 19:14:55 +0530 | [diff] [blame] | 751 | /* |
Rusty Russell | a23ea92 | 2010-01-18 19:14:55 +0530 | [diff] [blame] | 752 | * get_chars() is the callback from the hvc_console infrastructure |
| 753 | * when an interrupt is received. |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 754 | * |
Amit Shah | 203baab | 2010-01-18 19:15:12 +0530 | [diff] [blame] | 755 | * We call out to fill_readbuf that gets us the required data from the |
| 756 | * buffers that are queued up. |
Rusty Russell | a23ea92 | 2010-01-18 19:14:55 +0530 | [diff] [blame] | 757 | */ |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 758 | static int get_chars(u32 vtermno, char *buf, int count) |
| 759 | { |
Rusty Russell | 21206ed | 2010-01-18 19:15:00 +0530 | [diff] [blame] | 760 | struct port *port; |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 761 | |
Amit Shah | 6dc69f9 | 2010-05-19 22:15:47 -0600 | [diff] [blame] | 762 | /* 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 Shah | 38edf58 | 2010-01-18 19:15:05 +0530 | [diff] [blame] | 766 | port = find_port_by_vtermno(vtermno); |
| 767 | if (!port) |
Amit Shah | 6dc69f9 | 2010-05-19 22:15:47 -0600 | [diff] [blame] | 768 | return -EPIPE; |
Rusty Russell | 21206ed | 2010-01-18 19:15:00 +0530 | [diff] [blame] | 769 | |
| 770 | /* If we don't have an input queue yet, we can't get input. */ |
| 771 | BUG_ON(!port->in_vq); |
| 772 | |
Amit Shah | b766cee | 2009-12-21 21:26:45 +0530 | [diff] [blame] | 773 | return fill_readbuf(port, buf, count, false); |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 774 | } |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 775 | |
Amit Shah | cb06e36 | 2010-01-18 19:15:08 +0530 | [diff] [blame] | 776 | static void resize_console(struct port *port) |
Christian Borntraeger | c298345 | 2008-11-25 13:36:26 +0100 | [diff] [blame] | 777 | { |
Amit Shah | cb06e36 | 2010-01-18 19:15:08 +0530 | [diff] [blame] | 778 | struct virtio_device *vdev; |
Christian Borntraeger | c298345 | 2008-11-25 13:36:26 +0100 | [diff] [blame] | 779 | |
Amit Shah | 2de16a4 | 2010-03-19 17:36:44 +0530 | [diff] [blame] | 780 | /* The port could have been hot-unplugged */ |
Amit Shah | 9778829 | 2010-05-06 02:05:08 +0530 | [diff] [blame] | 781 | if (!port || !is_console_port(port)) |
Amit Shah | 2de16a4 | 2010-03-19 17:36:44 +0530 | [diff] [blame] | 782 | return; |
| 783 | |
Amit Shah | cb06e36 | 2010-01-18 19:15:08 +0530 | [diff] [blame] | 784 | vdev = port->portdev->vdev; |
Amit Shah | 9778829 | 2010-05-06 02:05:08 +0530 | [diff] [blame] | 785 | if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) |
| 786 | hvc_resize(port->cons.hvc, port->cons.ws); |
Christian Borntraeger | c298345 | 2008-11-25 13:36:26 +0100 | [diff] [blame] | 787 | } |
| 788 | |
Amit Shah | 38edf58 | 2010-01-18 19:15:05 +0530 | [diff] [blame] | 789 | /* We set the configuration at this point, since we now have a tty */ |
Christian Borntraeger | 91fcad1 | 2008-06-20 15:24:15 +0200 | [diff] [blame] | 790 | static int notifier_add_vio(struct hvc_struct *hp, int data) |
| 791 | { |
Amit Shah | 38edf58 | 2010-01-18 19:15:05 +0530 | [diff] [blame] | 792 | struct port *port; |
| 793 | |
| 794 | port = find_port_by_vtermno(hp->vtermno); |
| 795 | if (!port) |
| 796 | return -EINVAL; |
| 797 | |
Christian Borntraeger | 91fcad1 | 2008-06-20 15:24:15 +0200 | [diff] [blame] | 798 | hp->irq_requested = 1; |
Amit Shah | cb06e36 | 2010-01-18 19:15:08 +0530 | [diff] [blame] | 799 | resize_console(port); |
Christian Borntraeger | c298345 | 2008-11-25 13:36:26 +0100 | [diff] [blame] | 800 | |
Christian Borntraeger | 91fcad1 | 2008-06-20 15:24:15 +0200 | [diff] [blame] | 801 | return 0; |
| 802 | } |
| 803 | |
| 804 | static void notifier_del_vio(struct hvc_struct *hp, int data) |
| 805 | { |
| 806 | hp->irq_requested = 0; |
| 807 | } |
| 808 | |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 809 | /* The operations for console ports. */ |
Rusty Russell | 1dff399 | 2009-11-28 12:20:26 +0530 | [diff] [blame] | 810 | static const struct hv_ops hv_ops = { |
Rusty Russell | 971f339 | 2010-01-18 19:14:56 +0530 | [diff] [blame] | 811 | .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 | */ |
| 827 | int __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 Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 833 | int init_port_console(struct port *port) |
Amit Shah | cfa6d37 | 2010-01-18 19:15:10 +0530 | [diff] [blame] | 834 | { |
| 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 Shah | 298add7 | 2010-01-18 16:35:23 +0530 | [diff] [blame] | 859 | dev_err(port->dev, |
| 860 | "error %d allocating hvc for port\n", ret); |
Amit Shah | cfa6d37 | 2010-01-18 19:15:10 +0530 | [diff] [blame] | 861 | 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 Shah | 3c7969c | 2009-11-26 11:25:38 +0530 | [diff] [blame] | 868 | port->guest_connected = true; |
Amit Shah | cfa6d37 | 2010-01-18 19:15:10 +0530 | [diff] [blame] | 869 | |
Amit Shah | 1d05160 | 2010-05-19 22:15:49 -0600 | [diff] [blame] | 870 | /* |
| 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 Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 877 | /* Notify host of port being opened */ |
| 878 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); |
| 879 | |
Amit Shah | cfa6d37 | 2010-01-18 19:15:10 +0530 | [diff] [blame] | 880 | return 0; |
| 881 | } |
| 882 | |
Amit Shah | 431edb8 | 2009-12-21 21:57:40 +0530 | [diff] [blame] | 883 | static 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 | |
| 893 | static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); |
| 894 | |
| 895 | static struct attribute *port_sysfs_entries[] = { |
| 896 | &dev_attr_name.attr, |
| 897 | NULL |
| 898 | }; |
| 899 | |
| 900 | static struct attribute_group port_attribute_group = { |
| 901 | .name = NULL, /* put in device directory */ |
| 902 | .attrs = port_sysfs_entries, |
| 903 | }; |
| 904 | |
Amit Shah | d99393e | 2009-12-21 22:36:21 +0530 | [diff] [blame] | 905 | static int debugfs_open(struct inode *inode, struct file *filp) |
| 906 | { |
| 907 | filp->private_data = inode->i_private; |
| 908 | return 0; |
| 909 | } |
| 910 | |
| 911 | static 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 Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 932 | "outvq_full: %d\n", port->outvq_full); |
| 933 | out_offset += snprintf(buf + out_offset, out_count - out_offset, |
Amit Shah | d99393e | 2009-12-21 22:36:21 +0530 | [diff] [blame] | 934 | "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 | |
| 944 | static const struct file_operations port_debugfs_ops = { |
| 945 | .owner = THIS_MODULE, |
| 946 | .open = debugfs_open, |
| 947 | .read = debugfs_read, |
| 948 | }; |
| 949 | |
Amit Shah | 9778829 | 2010-05-06 02:05:08 +0530 | [diff] [blame] | 950 | static 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 Shah | c446f8f | 2010-05-19 22:15:48 -0600 | [diff] [blame] | 959 | static 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 | |
| 985 | static 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 Shah | 9778829 | 2010-05-06 02:05:08 +0530 | [diff] [blame] | 1007 | port->cons.ws.ws_row = port->cons.ws.ws_col = 0; |
| 1008 | |
Amit Shah | c446f8f | 2010-05-19 22:15:48 -0600 | [diff] [blame] | 1009 | port->host_connected = port->guest_connected = false; |
| 1010 | |
Amit Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 1011 | port->outvq_full = false; |
| 1012 | |
Amit Shah | c446f8f | 2010-05-19 22:15:48 -0600 | [diff] [blame] | 1013 | 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 Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 1037 | spin_lock_init(&port->outvq_lock); |
Amit Shah | c446f8f | 2010-05-19 22:15:48 -0600 | [diff] [blame] | 1038 | 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 | |
| 1082 | free_inbufs: |
| 1083 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) |
| 1084 | free_buf(buf); |
| 1085 | free_device: |
| 1086 | device_destroy(pdrvdata.class, port->dev->devt); |
| 1087 | free_cdev: |
| 1088 | cdev_del(&port->cdev); |
| 1089 | free_port: |
| 1090 | kfree(port); |
| 1091 | fail: |
| 1092 | /* The host might want to notify management sw about port add failure */ |
Julia Lawall | 0643e4c | 2010-05-15 11:45:53 +0200 | [diff] [blame] | 1093 | __send_control_msg(portdev, id, VIRTIO_CONSOLE_PORT_READY, 0); |
Amit Shah | c446f8f | 2010-05-19 22:15:48 -0600 | [diff] [blame] | 1094 | return err; |
| 1095 | } |
| 1096 | |
Amit Shah | 1f7aa42 | 2009-12-21 22:27:31 +0530 | [diff] [blame] | 1097 | /* Remove all port-specific data. */ |
| 1098 | static int remove_port(struct port *port) |
| 1099 | { |
Amit Shah | a9cdd48 | 2010-02-12 10:32:15 +0530 | [diff] [blame] | 1100 | struct port_buffer *buf; |
| 1101 | |
Amit Shah | 1f7aa42 | 2009-12-21 22:27:31 +0530 | [diff] [blame] | 1102 | 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 Shah | 69eb9a9 | 2010-05-19 22:15:47 -0600 | [diff] [blame] | 1110 | #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 Shah | 1f7aa42 | 2009-12-21 22:27:31 +0530 | [diff] [blame] | 1120 | hvc_remove(port->cons.hvc); |
Amit Shah | 69eb9a9 | 2010-05-19 22:15:47 -0600 | [diff] [blame] | 1121 | #endif |
Amit Shah | 1f7aa42 | 2009-12-21 22:27:31 +0530 | [diff] [blame] | 1122 | } |
| 1123 | if (port->guest_connected) |
| 1124 | send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); |
| 1125 | |
Amit Shah | 1f7aa42 | 2009-12-21 22:27:31 +0530 | [diff] [blame] | 1126 | sysfs_remove_group(&port->dev->kobj, &port_attribute_group); |
| 1127 | device_destroy(pdrvdata.class, port->dev->devt); |
| 1128 | cdev_del(&port->cdev); |
| 1129 | |
Amit Shah | a9cdd48 | 2010-02-12 10:32:15 +0530 | [diff] [blame] | 1130 | /* Remove unused data this port might have received. */ |
Amit Shah | 1f7aa42 | 2009-12-21 22:27:31 +0530 | [diff] [blame] | 1131 | discard_port_data(port); |
Amit Shah | a9cdd48 | 2010-02-12 10:32:15 +0530 | [diff] [blame] | 1132 | |
Amit Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 1133 | reclaim_consumed_buffers(port); |
| 1134 | |
Amit Shah | a9cdd48 | 2010-02-12 10:32:15 +0530 | [diff] [blame] | 1135 | /* Remove buffers we queued up for the Host to send us data in. */ |
Michael S. Tsirkin | 505b045 | 2010-04-12 16:18:32 +0300 | [diff] [blame] | 1136 | while ((buf = virtqueue_detach_unused_buf(port->in_vq))) |
Amit Shah | a9cdd48 | 2010-02-12 10:32:15 +0530 | [diff] [blame] | 1137 | free_buf(buf); |
| 1138 | |
Amit Shah | 1f7aa42 | 2009-12-21 22:27:31 +0530 | [diff] [blame] | 1139 | kfree(port->name); |
| 1140 | |
Amit Shah | d99393e | 2009-12-21 22:36:21 +0530 | [diff] [blame] | 1141 | debugfs_remove(port->debugfs_file); |
| 1142 | |
Amit Shah | 1f7aa42 | 2009-12-21 22:27:31 +0530 | [diff] [blame] | 1143 | kfree(port); |
| 1144 | return 0; |
| 1145 | } |
| 1146 | |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1147 | /* Any private messages that the Host and Guest want to share */ |
| 1148 | static 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 Shah | 431edb8 | 2009-12-21 21:57:40 +0530 | [diff] [blame] | 1153 | size_t name_size; |
| 1154 | int err; |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1155 | |
| 1156 | cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); |
| 1157 | |
| 1158 | port = find_port_by_id(portdev, cpkt->id); |
Amit Shah | f909f85 | 2010-05-19 22:15:48 -0600 | [diff] [blame] | 1159 | if (!port && cpkt->event != VIRTIO_CONSOLE_PORT_ADD) { |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1160 | /* 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 Shah | f909f85 | 2010-05-19 22:15:48 -0600 | [diff] [blame] | 1167 | case VIRTIO_CONSOLE_PORT_ADD: |
| 1168 | if (port) { |
Amit Shah | 1d05160 | 2010-05-19 22:15:49 -0600 | [diff] [blame] | 1169 | dev_dbg(&portdev->vdev->dev, |
| 1170 | "Port %u already added\n", port->id); |
Amit Shah | f909f85 | 2010-05-19 22:15:48 -0600 | [diff] [blame] | 1171 | 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 Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1185 | 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 Shah | 8345adb | 2010-05-06 02:05:09 +0530 | [diff] [blame] | 1197 | case VIRTIO_CONSOLE_RESIZE: { |
| 1198 | struct { |
| 1199 | __u16 rows; |
| 1200 | __u16 cols; |
| 1201 | } size; |
| 1202 | |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1203 | if (!is_console_port(port)) |
| 1204 | break; |
Amit Shah | 8345adb | 2010-05-06 02:05:09 +0530 | [diff] [blame] | 1205 | |
| 1206 | memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt), |
| 1207 | sizeof(size)); |
| 1208 | set_console_size(port, size.rows, size.cols); |
| 1209 | |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1210 | port->cons.hvc->irq_requested = 1; |
| 1211 | resize_console(port); |
| 1212 | break; |
Amit Shah | 8345adb | 2010-05-06 02:05:09 +0530 | [diff] [blame] | 1213 | } |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 1214 | case VIRTIO_CONSOLE_PORT_OPEN: |
| 1215 | port->host_connected = cpkt->value; |
| 1216 | wake_up_interruptible(&port->waitqueue); |
Amit Shah | cdfadfc | 2010-05-19 22:15:50 -0600 | [diff] [blame] | 1217 | /* |
| 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 Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 1225 | break; |
Amit Shah | 431edb8 | 2009-12-21 21:57:40 +0530 | [diff] [blame] | 1226 | 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 Shah | ec64213 | 2010-03-19 17:36:43 +0530 | [diff] [blame] | 1249 | if (err) { |
Amit Shah | 431edb8 | 2009-12-21 21:57:40 +0530 | [diff] [blame] | 1250 | dev_err(port->dev, |
| 1251 | "Error %d creating sysfs device attributes\n", |
| 1252 | err); |
Amit Shah | ec64213 | 2010-03-19 17:36:43 +0530 | [diff] [blame] | 1253 | } 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 Shah | 431edb8 | 2009-12-21 21:57:40 +0530 | [diff] [blame] | 1261 | break; |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1262 | } |
| 1263 | } |
| 1264 | |
| 1265 | static 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. Tsirkin | 505b045 | 2010-04-12 16:18:32 +0300 | [diff] [blame] | 1276 | while ((buf = virtqueue_get_buf(vq, &len))) { |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1277 | 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 | |
| 1294 | static 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 Shah | d693356 | 2010-02-12 10:32:18 +0530 | [diff] [blame] | 1304 | if (!port->inbuf) |
| 1305 | port->inbuf = get_inbuf(port); |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1306 | |
Amit Shah | 88f251a | 2009-12-21 22:15:30 +0530 | [diff] [blame] | 1307 | /* |
| 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 Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1317 | spin_unlock_irqrestore(&port->inbuf_lock, flags); |
| 1318 | |
Amit Shah | 2030fa4 | 2009-12-21 21:49:30 +0530 | [diff] [blame] | 1319 | wake_up_interruptible(&port->waitqueue); |
| 1320 | |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1321 | if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
| 1322 | hvc_kick(); |
| 1323 | } |
| 1324 | |
| 1325 | static 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 Shah | 7f5d810 | 2009-12-21 22:22:08 +0530 | [diff] [blame] | 1333 | static void config_intr(struct virtio_device *vdev) |
| 1334 | { |
| 1335 | struct ports_device *portdev; |
| 1336 | |
| 1337 | portdev = vdev->priv; |
Amit Shah | 99f905f | 2010-05-19 22:15:48 -0600 | [diff] [blame] | 1338 | |
Amit Shah | 4038f5b7 | 2010-05-06 02:05:07 +0530 | [diff] [blame] | 1339 | if (!use_multiport(portdev)) { |
Amit Shah | 9778829 | 2010-05-06 02:05:08 +0530 | [diff] [blame] | 1340 | 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 Shah | 4038f5b7 | 2010-05-06 02:05:07 +0530 | [diff] [blame] | 1353 | /* |
| 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 Shah | 9778829 | 2010-05-06 02:05:08 +0530 | [diff] [blame] | 1360 | resize_console(port); |
Amit Shah | 4038f5b7 | 2010-05-06 02:05:07 +0530 | [diff] [blame] | 1361 | } |
Amit Shah | 7f5d810 | 2009-12-21 22:22:08 +0530 | [diff] [blame] | 1362 | } |
| 1363 | |
Amit Shah | 2658a79 | 2010-01-18 19:15:11 +0530 | [diff] [blame] | 1364 | static int init_vqs(struct ports_device *portdev) |
| 1365 | { |
| 1366 | vq_callback_t **io_callbacks; |
| 1367 | char **io_names; |
| 1368 | struct virtqueue **vqs; |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1369 | u32 i, j, nr_ports, nr_queues; |
Amit Shah | 2658a79 | 2010-01-18 19:15:11 +0530 | [diff] [blame] | 1370 | int err; |
| 1371 | |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1372 | nr_ports = portdev->config.max_nr_ports; |
| 1373 | nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; |
Amit Shah | 2658a79 | 2010-01-18 19:15:11 +0530 | [diff] [blame] | 1374 | |
| 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 Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1403 | /* |
| 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 Shah | 2658a79 | 2010-01-18 19:15:11 +0530 | [diff] [blame] | 1414 | |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1415 | 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 Shah | 2658a79 | 2010-01-18 19:15:11 +0530 | [diff] [blame] | 1429 | /* 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 Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1436 | j = 0; |
Amit Shah | 2658a79 | 2010-01-18 19:15:11 +0530 | [diff] [blame] | 1437 | portdev->in_vqs[0] = vqs[0]; |
| 1438 | portdev->out_vqs[0] = vqs[1]; |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1439 | j += 2; |
| 1440 | if (use_multiport(portdev)) { |
| 1441 | portdev->c_ivq = vqs[j]; |
| 1442 | portdev->c_ovq = vqs[j + 1]; |
Amit Shah | 2658a79 | 2010-01-18 19:15:11 +0530 | [diff] [blame] | 1443 | |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1444 | 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 Shah | 2658a79 | 2010-01-18 19:15:11 +0530 | [diff] [blame] | 1450 | kfree(io_callbacks); |
| 1451 | kfree(io_names); |
| 1452 | kfree(vqs); |
| 1453 | |
| 1454 | return 0; |
| 1455 | |
| 1456 | free_names: |
| 1457 | kfree(io_names); |
| 1458 | free_callbacks: |
| 1459 | kfree(io_callbacks); |
| 1460 | free_outvqs: |
| 1461 | kfree(portdev->out_vqs); |
| 1462 | free_invqs: |
| 1463 | kfree(portdev->in_vqs); |
| 1464 | free_vqs: |
| 1465 | kfree(vqs); |
| 1466 | fail: |
| 1467 | return err; |
| 1468 | } |
| 1469 | |
Amit Shah | fb08bd2 | 2009-12-21 21:36:04 +0530 | [diff] [blame] | 1470 | static const struct file_operations portdev_fops = { |
| 1471 | .owner = THIS_MODULE, |
| 1472 | }; |
| 1473 | |
Amit Shah | 1c85bf3 | 2010-01-18 19:15:07 +0530 | [diff] [blame] | 1474 | /* |
| 1475 | * Once we're further in boot, we get probed like any other virtio |
| 1476 | * device. |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1477 | * |
| 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 Shah | 1c85bf3 | 2010-01-18 19:15:07 +0530 | [diff] [blame] | 1481 | */ |
| 1482 | static int __devinit virtcons_probe(struct virtio_device *vdev) |
| 1483 | { |
Amit Shah | 1c85bf3 | 2010-01-18 19:15:07 +0530 | [diff] [blame] | 1484 | struct ports_device *portdev; |
| 1485 | int err; |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1486 | bool multiport; |
Amit Shah | 1c85bf3 | 2010-01-18 19:15:07 +0530 | [diff] [blame] | 1487 | |
| 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 Shah | fb08bd2 | 2009-12-21 21:36:04 +0530 | [diff] [blame] | 1498 | 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 Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1512 | multiport = false; |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1513 | 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 Shah | b99fa81 | 2010-05-19 22:15:46 -0600 | [diff] [blame] | 1518 | vdev->config->get(vdev, offsetof(struct virtio_console_config, |
Amit Shah | b99fa81 | 2010-05-19 22:15:46 -0600 | [diff] [blame] | 1519 | max_nr_ports), |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1520 | &portdev->config.max_nr_ports, |
| 1521 | sizeof(portdev->config.max_nr_ports)); |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1522 | } |
| 1523 | |
| 1524 | /* Let the Host know we support multiple ports.*/ |
| 1525 | vdev->config->finalize_features(vdev); |
| 1526 | |
Amit Shah | 2658a79 | 2010-01-18 19:15:11 +0530 | [diff] [blame] | 1527 | err = init_vqs(portdev); |
| 1528 | if (err < 0) { |
| 1529 | dev_err(&vdev->dev, "Error %d initializing vqs\n", err); |
Amit Shah | fb08bd2 | 2009-12-21 21:36:04 +0530 | [diff] [blame] | 1530 | goto free_chrdev; |
Amit Shah | 2658a79 | 2010-01-18 19:15:11 +0530 | [diff] [blame] | 1531 | } |
Amit Shah | 1c85bf3 | 2010-01-18 19:15:07 +0530 | [diff] [blame] | 1532 | |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1533 | spin_lock_init(&portdev->ports_lock); |
| 1534 | INIT_LIST_HEAD(&portdev->ports); |
| 1535 | |
| 1536 | if (multiport) { |
Amit Shah | 335a64a5c | 2010-02-24 10:37:44 +0530 | [diff] [blame] | 1537 | unsigned int nr_added_bufs; |
| 1538 | |
Amit Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1539 | spin_lock_init(&portdev->cvq_lock); |
| 1540 | INIT_WORK(&portdev->control_work, &control_work_handler); |
| 1541 | |
Amit Shah | 335a64a5c | 2010-02-24 10:37:44 +0530 | [diff] [blame] | 1542 | nr_added_bufs = fill_queue(portdev->c_ivq, &portdev->cvq_lock); |
| 1543 | if (!nr_added_bufs) { |
Amit Shah | 22a29ea | 2010-02-12 10:32:17 +0530 | [diff] [blame] | 1544 | dev_err(&vdev->dev, |
| 1545 | "Error allocating buffers for control queue\n"); |
| 1546 | err = -ENOMEM; |
| 1547 | goto free_vqs; |
| 1548 | } |
Amit Shah | 1d05160 | 2010-05-19 22:15:49 -0600 | [diff] [blame] | 1549 | } 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 Shah | 17634ba | 2009-12-21 21:03:25 +0530 | [diff] [blame] | 1555 | } |
| 1556 | |
Amit Shah | f909f85 | 2010-05-19 22:15:48 -0600 | [diff] [blame] | 1557 | __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, |
| 1558 | VIRTIO_CONSOLE_DEVICE_READY, 1); |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 1559 | return 0; |
| 1560 | |
Amit Shah | 22a29ea | 2010-02-12 10:32:17 +0530 | [diff] [blame] | 1561 | free_vqs: |
Julia Lawall | 0643e4c | 2010-05-15 11:45:53 +0200 | [diff] [blame] | 1562 | /* 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 Shah | 22a29ea | 2010-02-12 10:32:17 +0530 | [diff] [blame] | 1565 | vdev->config->del_vqs(vdev); |
| 1566 | kfree(portdev->in_vqs); |
| 1567 | kfree(portdev->out_vqs); |
Amit Shah | fb08bd2 | 2009-12-21 21:36:04 +0530 | [diff] [blame] | 1568 | free_chrdev: |
| 1569 | unregister_chrdev(portdev->chr_major, "virtio-portsdev"); |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 1570 | free: |
Amit Shah | 1c85bf3 | 2010-01-18 19:15:07 +0530 | [diff] [blame] | 1571 | kfree(portdev); |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 1572 | fail: |
| 1573 | return err; |
| 1574 | } |
| 1575 | |
Amit Shah | 7177876 | 2010-02-12 10:32:16 +0530 | [diff] [blame] | 1576 | static 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 Shah | 7177876 | 2010-02-12 10:32:16 +0530 | [diff] [blame] | 1586 | |
| 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. Tsirkin | 505b045 | 2010-04-12 16:18:32 +0300 | [diff] [blame] | 1592 | while ((buf = virtqueue_get_buf(portdev->c_ivq, &len))) |
Amit Shah | 7177876 | 2010-02-12 10:32:16 +0530 | [diff] [blame] | 1593 | free_buf(buf); |
| 1594 | |
Michael S. Tsirkin | 505b045 | 2010-04-12 16:18:32 +0300 | [diff] [blame] | 1595 | while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq))) |
Amit Shah | 7177876 | 2010-02-12 10:32:16 +0530 | [diff] [blame] | 1596 | 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 Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 1605 | static struct virtio_device_id id_table[] = { |
| 1606 | { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, |
| 1607 | { 0 }, |
| 1608 | }; |
| 1609 | |
Christian Borntraeger | c298345 | 2008-11-25 13:36:26 +0100 | [diff] [blame] | 1610 | static unsigned int features[] = { |
| 1611 | VIRTIO_CONSOLE_F_SIZE, |
Amit Shah | b99fa81 | 2010-05-19 22:15:46 -0600 | [diff] [blame] | 1612 | VIRTIO_CONSOLE_F_MULTIPORT, |
Christian Borntraeger | c298345 | 2008-11-25 13:36:26 +0100 | [diff] [blame] | 1613 | }; |
| 1614 | |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 1615 | static struct virtio_driver virtio_console = { |
Christian Borntraeger | c298345 | 2008-11-25 13:36:26 +0100 | [diff] [blame] | 1616 | .feature_table = features, |
| 1617 | .feature_table_size = ARRAY_SIZE(features), |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 1618 | .driver.name = KBUILD_MODNAME, |
| 1619 | .driver.owner = THIS_MODULE, |
| 1620 | .id_table = id_table, |
| 1621 | .probe = virtcons_probe, |
Amit Shah | 7177876 | 2010-02-12 10:32:16 +0530 | [diff] [blame] | 1622 | .remove = virtcons_remove, |
Amit Shah | 7f5d810 | 2009-12-21 22:22:08 +0530 | [diff] [blame] | 1623 | .config_changed = config_intr, |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 1624 | }; |
| 1625 | |
| 1626 | static int __init init(void) |
| 1627 | { |
Amit Shah | fb08bd2 | 2009-12-21 21:36:04 +0530 | [diff] [blame] | 1628 | 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 Shah | d99393e | 2009-12-21 22:36:21 +0530 | [diff] [blame] | 1636 | |
| 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 Shah | 38edf58 | 2010-01-18 19:15:05 +0530 | [diff] [blame] | 1642 | INIT_LIST_HEAD(&pdrvdata.consoles); |
| 1643 | |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 1644 | return register_virtio_driver(&virtio_console); |
| 1645 | } |
Amit Shah | 7177876 | 2010-02-12 10:32:16 +0530 | [diff] [blame] | 1646 | |
| 1647 | static 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 Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 1655 | module_init(init); |
Amit Shah | 7177876 | 2010-02-12 10:32:16 +0530 | [diff] [blame] | 1656 | module_exit(fini); |
Rusty Russell | 3161043 | 2007-10-22 11:03:39 +1000 | [diff] [blame] | 1657 | |
| 1658 | MODULE_DEVICE_TABLE(virtio, id_table); |
| 1659 | MODULE_DESCRIPTION("Virtio console driver"); |
| 1660 | MODULE_LICENSE("GPL"); |