Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 1 | /* |
| 2 | * hvc_iucv.c - z/VM IUCV back-end for the Hypervisor Console (HVC) |
| 3 | * |
| 4 | * This back-end for HVC provides terminal access via |
| 5 | * z/VM IUCV communication paths. |
| 6 | * |
| 7 | * Copyright IBM Corp. 2008. |
| 8 | * |
| 9 | * Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com> |
| 10 | */ |
| 11 | #define KMSG_COMPONENT "hvc_iucv" |
| 12 | |
| 13 | #include <linux/types.h> |
| 14 | #include <asm/ebcdic.h> |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 15 | #include <linux/delay.h> |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 16 | #include <linux/mempool.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/tty.h> |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 19 | #include <linux/wait.h> |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 20 | #include <net/iucv/iucv.h> |
| 21 | |
| 22 | #include "hvc_console.h" |
| 23 | |
| 24 | |
| 25 | /* HVC backend for z/VM IUCV */ |
| 26 | #define HVC_IUCV_MAGIC 0xc9e4c3e5 |
| 27 | #define MAX_HVC_IUCV_LINES HVC_ALLOC_TTY_ADAPTERS |
| 28 | #define MEMPOOL_MIN_NR (PAGE_SIZE / sizeof(struct iucv_tty_buffer)/4) |
| 29 | |
| 30 | /* IUCV TTY message */ |
| 31 | #define MSG_VERSION 0x02 /* Message version */ |
| 32 | #define MSG_TYPE_ERROR 0x01 /* Error message */ |
| 33 | #define MSG_TYPE_TERMENV 0x02 /* Terminal environment variable */ |
| 34 | #define MSG_TYPE_TERMIOS 0x04 /* Terminal IO struct update */ |
| 35 | #define MSG_TYPE_WINSIZE 0x08 /* Terminal window size update */ |
| 36 | #define MSG_TYPE_DATA 0x10 /* Terminal data */ |
| 37 | |
| 38 | #define MSG_SIZE(s) ((s) + offsetof(struct iucv_tty_msg, data)) |
| 39 | struct iucv_tty_msg { |
| 40 | u8 version; /* Message version */ |
| 41 | u8 type; /* Message type */ |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 42 | #define MSG_MAX_DATALEN ((u16)(~0)) |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 43 | u16 datalen; /* Payload length */ |
| 44 | u8 data[]; /* Payload buffer */ |
| 45 | } __attribute__((packed)); |
| 46 | |
| 47 | enum iucv_state_t { |
| 48 | IUCV_DISCONN = 0, |
| 49 | IUCV_CONNECTED = 1, |
| 50 | IUCV_SEVERED = 2, |
| 51 | }; |
| 52 | |
| 53 | enum tty_state_t { |
| 54 | TTY_CLOSED = 0, |
| 55 | TTY_OPENED = 1, |
| 56 | }; |
| 57 | |
| 58 | struct hvc_iucv_private { |
| 59 | struct hvc_struct *hvc; /* HVC console struct reference */ |
| 60 | u8 srv_name[8]; /* IUCV service name (ebcdic) */ |
| 61 | enum iucv_state_t iucv_state; /* IUCV connection status */ |
| 62 | enum tty_state_t tty_state; /* TTY status */ |
| 63 | struct iucv_path *path; /* IUCV path pointer */ |
| 64 | spinlock_t lock; /* hvc_iucv_private lock */ |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 65 | #define SNDBUF_SIZE (PAGE_SIZE) /* must be < MSG_MAX_DATALEN */ |
| 66 | void *sndbuf; /* send buffer */ |
| 67 | size_t sndbuf_len; /* length of send buffer */ |
| 68 | #define QUEUE_SNDBUF_DELAY (HZ / 25) |
| 69 | struct delayed_work sndbuf_work; /* work: send iucv msg(s) */ |
| 70 | wait_queue_head_t sndbuf_waitq; /* wait for send completion */ |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 71 | struct list_head tty_outqueue; /* outgoing IUCV messages */ |
| 72 | struct list_head tty_inqueue; /* incoming IUCV messages */ |
| 73 | }; |
| 74 | |
| 75 | struct iucv_tty_buffer { |
| 76 | struct list_head list; /* list pointer */ |
| 77 | struct iucv_message msg; /* store an incoming IUCV message */ |
| 78 | size_t offset; /* data buffer offset */ |
| 79 | struct iucv_tty_msg *mbuf; /* buffer to store input/output data */ |
| 80 | }; |
| 81 | |
| 82 | /* IUCV callback handler */ |
| 83 | static int hvc_iucv_path_pending(struct iucv_path *, u8[8], u8[16]); |
| 84 | static void hvc_iucv_path_severed(struct iucv_path *, u8[16]); |
| 85 | static void hvc_iucv_msg_pending(struct iucv_path *, struct iucv_message *); |
| 86 | static void hvc_iucv_msg_complete(struct iucv_path *, struct iucv_message *); |
| 87 | |
| 88 | |
Hendrik Brueckner | 2dc184c | 2009-01-09 12:14:57 +0100 | [diff] [blame] | 89 | /* Kernel module parameter: use one terminal device as default */ |
| 90 | static unsigned long hvc_iucv_devices = 1; |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 91 | |
| 92 | /* Array of allocated hvc iucv tty lines... */ |
| 93 | static struct hvc_iucv_private *hvc_iucv_table[MAX_HVC_IUCV_LINES]; |
| 94 | |
| 95 | /* Kmem cache and mempool for iucv_tty_buffer elements */ |
| 96 | static struct kmem_cache *hvc_iucv_buffer_cache; |
| 97 | static mempool_t *hvc_iucv_mempool; |
| 98 | |
| 99 | /* IUCV handler callback functions */ |
| 100 | static struct iucv_handler hvc_iucv_handler = { |
| 101 | .path_pending = hvc_iucv_path_pending, |
| 102 | .path_severed = hvc_iucv_path_severed, |
| 103 | .message_complete = hvc_iucv_msg_complete, |
| 104 | .message_pending = hvc_iucv_msg_pending, |
| 105 | }; |
| 106 | |
| 107 | |
| 108 | /** |
| 109 | * hvc_iucv_get_private() - Return a struct hvc_iucv_private instance. |
| 110 | * @num: The HVC virtual terminal number (vtermno) |
| 111 | * |
| 112 | * This function returns the struct hvc_iucv_private instance that corresponds |
| 113 | * to the HVC virtual terminal number specified as parameter @num. |
| 114 | */ |
| 115 | struct hvc_iucv_private *hvc_iucv_get_private(uint32_t num) |
| 116 | { |
| 117 | if ((num < HVC_IUCV_MAGIC) || (num - HVC_IUCV_MAGIC > hvc_iucv_devices)) |
| 118 | return NULL; |
| 119 | return hvc_iucv_table[num - HVC_IUCV_MAGIC]; |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * alloc_tty_buffer() - Returns a new struct iucv_tty_buffer element. |
| 124 | * @size: Size of the internal buffer used to store data. |
| 125 | * @flags: Memory allocation flags passed to mempool. |
| 126 | * |
| 127 | * This function allocates a new struct iucv_tty_buffer element and, optionally, |
| 128 | * allocates an internal data buffer with the specified size @size. |
| 129 | * Note: The total message size arises from the internal buffer size and the |
| 130 | * members of the iucv_tty_msg structure. |
| 131 | * |
| 132 | * The function returns NULL if memory allocation has failed. |
| 133 | */ |
| 134 | static struct iucv_tty_buffer *alloc_tty_buffer(size_t size, gfp_t flags) |
| 135 | { |
| 136 | struct iucv_tty_buffer *bufp; |
| 137 | |
| 138 | bufp = mempool_alloc(hvc_iucv_mempool, flags); |
| 139 | if (!bufp) |
| 140 | return NULL; |
| 141 | memset(bufp, 0, sizeof(struct iucv_tty_buffer)); |
| 142 | |
| 143 | if (size > 0) { |
| 144 | bufp->msg.length = MSG_SIZE(size); |
| 145 | bufp->mbuf = kmalloc(bufp->msg.length, flags); |
| 146 | if (!bufp->mbuf) { |
| 147 | mempool_free(bufp, hvc_iucv_mempool); |
| 148 | return NULL; |
| 149 | } |
| 150 | bufp->mbuf->version = MSG_VERSION; |
| 151 | bufp->mbuf->type = MSG_TYPE_DATA; |
| 152 | bufp->mbuf->datalen = (u16) size; |
| 153 | } |
| 154 | return bufp; |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * destroy_tty_buffer() - destroy struct iucv_tty_buffer element. |
| 159 | * @bufp: Pointer to a struct iucv_tty_buffer element, SHALL NOT be NULL. |
| 160 | * |
| 161 | * The destroy_tty_buffer() function frees the internal data buffer and returns |
| 162 | * the struct iucv_tty_buffer element back to the mempool for freeing. |
| 163 | */ |
| 164 | static void destroy_tty_buffer(struct iucv_tty_buffer *bufp) |
| 165 | { |
| 166 | kfree(bufp->mbuf); |
| 167 | mempool_free(bufp, hvc_iucv_mempool); |
| 168 | } |
| 169 | |
| 170 | /** |
| 171 | * destroy_tty_buffer_list() - call destroy_tty_buffer() for each list element. |
| 172 | * @list: List head pointer to a list containing struct iucv_tty_buffer |
| 173 | * elements. |
| 174 | * |
| 175 | * Calls destroy_tty_buffer() for each struct iucv_tty_buffer element in the |
| 176 | * list @list. |
| 177 | */ |
| 178 | static void destroy_tty_buffer_list(struct list_head *list) |
| 179 | { |
| 180 | struct iucv_tty_buffer *ent, *next; |
| 181 | |
| 182 | list_for_each_entry_safe(ent, next, list, list) { |
| 183 | list_del(&ent->list); |
| 184 | destroy_tty_buffer(ent); |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * hvc_iucv_write() - Receive IUCV message write data to HVC console buffer. |
| 190 | * @priv: Pointer to hvc_iucv_private structure. |
| 191 | * @buf: HVC console buffer for writing received terminal data. |
| 192 | * @count: HVC console buffer size. |
| 193 | * @has_more_data: Pointer to an int variable. |
| 194 | * |
| 195 | * The function picks up pending messages from the input queue and receives |
| 196 | * the message data that is then written to the specified buffer @buf. |
| 197 | * If the buffer size @count is less than the data message size, then the |
| 198 | * message is kept on the input queue and @has_more_data is set to 1. |
| 199 | * If the message data has been entirely written, the message is removed from |
| 200 | * the input queue. |
| 201 | * |
| 202 | * The function returns the number of bytes written to the terminal, zero if |
| 203 | * there are no pending data messages available or if there is no established |
| 204 | * IUCV path. |
| 205 | * If the IUCV path has been severed, then -EPIPE is returned to cause a |
| 206 | * hang up (that is issued by the HVC console layer). |
| 207 | */ |
| 208 | static int hvc_iucv_write(struct hvc_iucv_private *priv, |
| 209 | char *buf, int count, int *has_more_data) |
| 210 | { |
| 211 | struct iucv_tty_buffer *rb; |
| 212 | int written; |
| 213 | int rc; |
| 214 | |
| 215 | /* Immediately return if there is no IUCV connection */ |
| 216 | if (priv->iucv_state == IUCV_DISCONN) |
| 217 | return 0; |
| 218 | |
| 219 | /* If the IUCV path has been severed, return -EPIPE to inform the |
| 220 | * hvc console layer to hang up the tty device. */ |
| 221 | if (priv->iucv_state == IUCV_SEVERED) |
| 222 | return -EPIPE; |
| 223 | |
| 224 | /* check if there are pending messages */ |
| 225 | if (list_empty(&priv->tty_inqueue)) |
| 226 | return 0; |
| 227 | |
| 228 | /* receive a iucv message and flip data to the tty (ldisc) */ |
| 229 | rb = list_first_entry(&priv->tty_inqueue, struct iucv_tty_buffer, list); |
| 230 | |
| 231 | written = 0; |
| 232 | if (!rb->mbuf) { /* message not yet received ... */ |
| 233 | /* allocate mem to store msg data; if no memory is available |
| 234 | * then leave the buffer on the list and re-try later */ |
| 235 | rb->mbuf = kmalloc(rb->msg.length, GFP_ATOMIC); |
| 236 | if (!rb->mbuf) |
| 237 | return -ENOMEM; |
| 238 | |
| 239 | rc = __iucv_message_receive(priv->path, &rb->msg, 0, |
| 240 | rb->mbuf, rb->msg.length, NULL); |
| 241 | switch (rc) { |
| 242 | case 0: /* Successful */ |
| 243 | break; |
| 244 | case 2: /* No message found */ |
| 245 | case 9: /* Message purged */ |
| 246 | break; |
| 247 | default: |
| 248 | written = -EIO; |
| 249 | } |
| 250 | /* remove buffer if an error has occured or received data |
| 251 | * is not correct */ |
| 252 | if (rc || (rb->mbuf->version != MSG_VERSION) || |
| 253 | (rb->msg.length != MSG_SIZE(rb->mbuf->datalen))) |
| 254 | goto out_remove_buffer; |
| 255 | } |
| 256 | |
| 257 | switch (rb->mbuf->type) { |
| 258 | case MSG_TYPE_DATA: |
| 259 | written = min_t(int, rb->mbuf->datalen - rb->offset, count); |
| 260 | memcpy(buf, rb->mbuf->data + rb->offset, written); |
| 261 | if (written < (rb->mbuf->datalen - rb->offset)) { |
| 262 | rb->offset += written; |
| 263 | *has_more_data = 1; |
| 264 | goto out_written; |
| 265 | } |
| 266 | break; |
| 267 | |
| 268 | case MSG_TYPE_WINSIZE: |
| 269 | if (rb->mbuf->datalen != sizeof(struct winsize)) |
| 270 | break; |
| 271 | hvc_resize(priv->hvc, *((struct winsize *)rb->mbuf->data)); |
| 272 | break; |
| 273 | |
| 274 | case MSG_TYPE_ERROR: /* ignored ... */ |
| 275 | case MSG_TYPE_TERMENV: /* ignored ... */ |
| 276 | case MSG_TYPE_TERMIOS: /* ignored ... */ |
| 277 | break; |
| 278 | } |
| 279 | |
| 280 | out_remove_buffer: |
| 281 | list_del(&rb->list); |
| 282 | destroy_tty_buffer(rb); |
| 283 | *has_more_data = !list_empty(&priv->tty_inqueue); |
| 284 | |
| 285 | out_written: |
| 286 | return written; |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * hvc_iucv_get_chars() - HVC get_chars operation. |
| 291 | * @vtermno: HVC virtual terminal number. |
| 292 | * @buf: Pointer to a buffer to store data |
| 293 | * @count: Size of buffer available for writing |
| 294 | * |
| 295 | * The hvc_console thread calls this method to read characters from |
| 296 | * the terminal backend. If an IUCV communication path has been established, |
| 297 | * pending IUCV messages are received and data is copied into buffer @buf |
| 298 | * up to @count bytes. |
| 299 | * |
| 300 | * Locking: The routine gets called under an irqsave() spinlock; and |
| 301 | * the routine locks the struct hvc_iucv_private->lock to call |
| 302 | * helper functions. |
| 303 | */ |
| 304 | static int hvc_iucv_get_chars(uint32_t vtermno, char *buf, int count) |
| 305 | { |
| 306 | struct hvc_iucv_private *priv = hvc_iucv_get_private(vtermno); |
| 307 | int written; |
| 308 | int has_more_data; |
| 309 | |
| 310 | if (count <= 0) |
| 311 | return 0; |
| 312 | |
| 313 | if (!priv) |
| 314 | return -ENODEV; |
| 315 | |
| 316 | spin_lock(&priv->lock); |
| 317 | has_more_data = 0; |
| 318 | written = hvc_iucv_write(priv, buf, count, &has_more_data); |
| 319 | spin_unlock(&priv->lock); |
| 320 | |
| 321 | /* if there are still messages on the queue... schedule another run */ |
| 322 | if (has_more_data) |
| 323 | hvc_kick(); |
| 324 | |
| 325 | return written; |
| 326 | } |
| 327 | |
| 328 | /** |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 329 | * hvc_iucv_queue() - Buffer terminal data for sending. |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 330 | * @priv: Pointer to struct hvc_iucv_private instance. |
| 331 | * @buf: Buffer containing data to send. |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 332 | * @count: Size of buffer and amount of data to send. |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 333 | * |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 334 | * The function queues data for sending. To actually send the buffered data, |
| 335 | * a work queue function is * scheduled (with QUEUE_SNDBUF_DELAY). |
| 336 | * The function returns the number of data bytes that has been buffered. |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 337 | * |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 338 | * If the device is not connected, data is ignored and the function returns |
| 339 | * @count. |
| 340 | * If the buffer is full, the function returns 0. |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 341 | * If an existing IUCV communicaton path has been severed, the function returns |
| 342 | * -EPIPE (can be passed to HVC layer to cause a tty hangup). |
| 343 | */ |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 344 | static int hvc_iucv_queue(struct hvc_iucv_private *priv, const char *buf, |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 345 | int count) |
| 346 | { |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 347 | size_t len; |
| 348 | |
| 349 | if (priv->iucv_state == IUCV_DISCONN) |
| 350 | return count; /* ignore data */ |
| 351 | |
| 352 | if (priv->iucv_state == IUCV_SEVERED) |
| 353 | return -EPIPE; |
| 354 | |
| 355 | len = min_t(size_t, count, SNDBUF_SIZE - priv->sndbuf_len); |
| 356 | if (!len) |
| 357 | return 0; |
| 358 | |
| 359 | memcpy(priv->sndbuf + priv->sndbuf_len, buf, len); |
| 360 | priv->sndbuf_len += len; |
| 361 | |
| 362 | if (priv->iucv_state == IUCV_CONNECTED) |
| 363 | schedule_delayed_work(&priv->sndbuf_work, QUEUE_SNDBUF_DELAY); |
| 364 | |
| 365 | return len; |
| 366 | } |
| 367 | |
| 368 | /** |
| 369 | * hvc_iucv_send() - Send an IUCV message containing terminal data. |
| 370 | * @priv: Pointer to struct hvc_iucv_private instance. |
| 371 | * |
| 372 | * If an IUCV communication path has been established, the queued data |
| 373 | * for output are sent via an IUCV message. |
| 374 | * |
| 375 | * If there is no IUCV communication path established, the function returns 0. |
| 376 | * If an existing IUCV communicaton path has been severed, the function returns |
| 377 | * -EPIPE. |
| 378 | */ |
| 379 | static int hvc_iucv_send(struct hvc_iucv_private *priv) |
| 380 | { |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 381 | struct iucv_tty_buffer *sb; |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 382 | int rc, len; |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 383 | |
| 384 | if (priv->iucv_state == IUCV_SEVERED) |
| 385 | return -EPIPE; |
| 386 | |
| 387 | if (priv->iucv_state == IUCV_DISCONN) |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 388 | return -EIO; |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 389 | |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 390 | if (!priv->sndbuf_len) |
| 391 | return 0; |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 392 | |
| 393 | /* allocate internal buffer to store msg data and also compute total |
| 394 | * message length */ |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 395 | sb = alloc_tty_buffer(priv->sndbuf_len, GFP_ATOMIC); |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 396 | if (!sb) |
| 397 | return -ENOMEM; |
| 398 | |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 399 | memcpy(sb->mbuf->data, priv->sndbuf, priv->sndbuf_len); |
| 400 | sb->mbuf->datalen = (u16) priv->sndbuf_len; |
| 401 | sb->msg.length = MSG_SIZE(sb->mbuf->datalen); |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 402 | |
| 403 | list_add_tail(&sb->list, &priv->tty_outqueue); |
| 404 | |
| 405 | rc = __iucv_message_send(priv->path, &sb->msg, 0, 0, |
| 406 | (void *) sb->mbuf, sb->msg.length); |
| 407 | if (rc) { |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 408 | /* drop the message here; however we might want to handle |
| 409 | * 0x03 (msg limit reached) by trying again... */ |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 410 | list_del(&sb->list); |
| 411 | destroy_tty_buffer(sb); |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 412 | } |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 413 | len = priv->sndbuf_len; |
| 414 | priv->sndbuf_len = 0; |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 415 | |
| 416 | return len; |
| 417 | } |
| 418 | |
| 419 | /** |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 420 | * hvc_iucv_sndbuf_work() - Send buffered data over IUCV |
| 421 | * @work: Work structure. |
| 422 | * |
| 423 | * The function sends buffered output data over IUCV and, if necessary, |
| 424 | * reschedules itself if not all buffered data could be sent. |
| 425 | */ |
| 426 | static void hvc_iucv_sndbuf_work(struct work_struct *work) |
| 427 | { |
| 428 | struct hvc_iucv_private *priv; |
| 429 | |
| 430 | priv = container_of(work, struct hvc_iucv_private, sndbuf_work.work); |
| 431 | |
| 432 | if (!priv) |
| 433 | return; |
| 434 | |
| 435 | spin_lock_bh(&priv->lock); |
| 436 | hvc_iucv_send(priv); |
| 437 | spin_unlock_bh(&priv->lock); |
| 438 | } |
| 439 | |
| 440 | /** |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 441 | * hvc_iucv_put_chars() - HVC put_chars operation. |
| 442 | * @vtermno: HVC virtual terminal number. |
| 443 | * @buf: Pointer to an buffer to read data from |
| 444 | * @count: Size of buffer available for reading |
| 445 | * |
| 446 | * The hvc_console thread calls this method to write characters from |
| 447 | * to the terminal backend. |
| 448 | * The function calls hvc_iucv_send() under the lock of the |
| 449 | * struct hvc_iucv_private instance that corresponds to the tty @vtermno. |
| 450 | * |
| 451 | * Locking: The method gets called under an irqsave() spinlock; and |
| 452 | * locks struct hvc_iucv_private->lock. |
| 453 | */ |
| 454 | static int hvc_iucv_put_chars(uint32_t vtermno, const char *buf, int count) |
| 455 | { |
| 456 | struct hvc_iucv_private *priv = hvc_iucv_get_private(vtermno); |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 457 | int queued; |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 458 | |
| 459 | if (count <= 0) |
| 460 | return 0; |
| 461 | |
| 462 | if (!priv) |
| 463 | return -ENODEV; |
| 464 | |
| 465 | spin_lock(&priv->lock); |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 466 | queued = hvc_iucv_queue(priv, buf, count); |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 467 | spin_unlock(&priv->lock); |
| 468 | |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 469 | return queued; |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 470 | } |
| 471 | |
| 472 | /** |
| 473 | * hvc_iucv_notifier_add() - HVC notifier for opening a TTY for the first time. |
| 474 | * @hp: Pointer to the HVC device (struct hvc_struct) |
| 475 | * @id: Additional data (originally passed to hvc_alloc): the index of an struct |
| 476 | * hvc_iucv_private instance. |
| 477 | * |
| 478 | * The function sets the tty state to TTY_OPEN for the struct hvc_iucv_private |
| 479 | * instance that is derived from @id. Always returns 0. |
| 480 | * |
| 481 | * Locking: struct hvc_iucv_private->lock, spin_lock_bh |
| 482 | */ |
| 483 | static int hvc_iucv_notifier_add(struct hvc_struct *hp, int id) |
| 484 | { |
| 485 | struct hvc_iucv_private *priv; |
| 486 | |
| 487 | priv = hvc_iucv_get_private(id); |
| 488 | if (!priv) |
| 489 | return 0; |
| 490 | |
| 491 | spin_lock_bh(&priv->lock); |
| 492 | priv->tty_state = TTY_OPENED; |
| 493 | spin_unlock_bh(&priv->lock); |
| 494 | |
| 495 | return 0; |
| 496 | } |
| 497 | |
| 498 | /** |
| 499 | * hvc_iucv_cleanup() - Clean up function if the tty portion is finally closed. |
| 500 | * @priv: Pointer to the struct hvc_iucv_private instance. |
| 501 | * |
| 502 | * The functions severs the established IUCV communication path (if any), and |
| 503 | * destroy struct iucv_tty_buffer elements from the in- and outqueue. Finally, |
| 504 | * the functions resets the states to TTY_CLOSED and IUCV_DISCONN. |
| 505 | */ |
| 506 | static void hvc_iucv_cleanup(struct hvc_iucv_private *priv) |
| 507 | { |
| 508 | destroy_tty_buffer_list(&priv->tty_outqueue); |
| 509 | destroy_tty_buffer_list(&priv->tty_inqueue); |
| 510 | |
| 511 | priv->tty_state = TTY_CLOSED; |
| 512 | priv->iucv_state = IUCV_DISCONN; |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 513 | |
| 514 | priv->sndbuf_len = 0; |
| 515 | } |
| 516 | |
| 517 | /** |
| 518 | * tty_outqueue_empty() - Test if the tty outq is empty |
| 519 | * @priv: Pointer to struct hvc_iucv_private instance. |
| 520 | */ |
| 521 | static inline int tty_outqueue_empty(struct hvc_iucv_private *priv) |
| 522 | { |
| 523 | int rc; |
| 524 | |
| 525 | spin_lock_bh(&priv->lock); |
| 526 | rc = list_empty(&priv->tty_outqueue); |
| 527 | spin_unlock_bh(&priv->lock); |
| 528 | |
| 529 | return rc; |
| 530 | } |
| 531 | |
| 532 | /** |
| 533 | * flush_sndbuf_sync() - Flush send buffer and wait for completion |
| 534 | * @priv: Pointer to struct hvc_iucv_private instance. |
| 535 | * |
| 536 | * The routine cancels a pending sndbuf work, calls hvc_iucv_send() |
| 537 | * to flush any buffered terminal output data and waits for completion. |
| 538 | */ |
| 539 | static void flush_sndbuf_sync(struct hvc_iucv_private *priv) |
| 540 | { |
| 541 | int sync_wait; |
| 542 | |
| 543 | cancel_delayed_work_sync(&priv->sndbuf_work); |
| 544 | |
| 545 | spin_lock_bh(&priv->lock); |
| 546 | hvc_iucv_send(priv); /* force sending buffered data */ |
| 547 | sync_wait = !list_empty(&priv->tty_outqueue); /* anything queued ? */ |
| 548 | spin_unlock_bh(&priv->lock); |
| 549 | |
| 550 | if (sync_wait) |
| 551 | wait_event_timeout(priv->sndbuf_waitq, |
| 552 | tty_outqueue_empty(priv), HZ); |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 553 | } |
| 554 | |
| 555 | /** |
| 556 | * hvc_iucv_notifier_hangup() - HVC notifier for tty hangups. |
| 557 | * @hp: Pointer to the HVC device (struct hvc_struct) |
| 558 | * @id: Additional data (originally passed to hvc_alloc): the index of an struct |
| 559 | * hvc_iucv_private instance. |
| 560 | * |
| 561 | * This routine notifies the HVC backend that a tty hangup (carrier loss, |
| 562 | * virtual or otherwise) has occured. |
| 563 | * |
| 564 | * The HVC backend for z/VM IUCV ignores virtual hangups (vhangup()), to keep |
| 565 | * an existing IUCV communication path established. |
| 566 | * (Background: vhangup() is called from user space (by getty or login) to |
| 567 | * disable writing to the tty by other applications). |
| 568 | * |
| 569 | * If the tty has been opened (e.g. getty) and an established IUCV path has been |
| 570 | * severed (we caused the tty hangup in that case), then the functions invokes |
| 571 | * hvc_iucv_cleanup() to clean up. |
| 572 | * |
| 573 | * Locking: struct hvc_iucv_private->lock |
| 574 | */ |
| 575 | static void hvc_iucv_notifier_hangup(struct hvc_struct *hp, int id) |
| 576 | { |
| 577 | struct hvc_iucv_private *priv; |
| 578 | |
| 579 | priv = hvc_iucv_get_private(id); |
| 580 | if (!priv) |
| 581 | return; |
| 582 | |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 583 | flush_sndbuf_sync(priv); |
| 584 | |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 585 | spin_lock_bh(&priv->lock); |
| 586 | /* NOTE: If the hangup was scheduled by ourself (from the iucv |
| 587 | * path_servered callback [IUCV_SEVERED]), then we have to |
| 588 | * finally clean up the tty backend structure and set state to |
| 589 | * TTY_CLOSED. |
| 590 | * |
| 591 | * If the tty was hung up otherwise (e.g. vhangup()), then we |
| 592 | * ignore this hangup and keep an established IUCV path open... |
| 593 | * (...the reason is that we are not able to connect back to the |
| 594 | * client if we disconnect on hang up) */ |
| 595 | priv->tty_state = TTY_CLOSED; |
| 596 | |
| 597 | if (priv->iucv_state == IUCV_SEVERED) |
| 598 | hvc_iucv_cleanup(priv); |
| 599 | spin_unlock_bh(&priv->lock); |
| 600 | } |
| 601 | |
| 602 | /** |
| 603 | * hvc_iucv_notifier_del() - HVC notifier for closing a TTY for the last time. |
| 604 | * @hp: Pointer to the HVC device (struct hvc_struct) |
| 605 | * @id: Additional data (originally passed to hvc_alloc): |
| 606 | * the index of an struct hvc_iucv_private instance. |
| 607 | * |
| 608 | * This routine notifies the HVC backend that the last tty device file |
| 609 | * descriptor has been closed. |
| 610 | * The function calls hvc_iucv_cleanup() to clean up the struct hvc_iucv_private |
| 611 | * instance. |
| 612 | * |
| 613 | * Locking: struct hvc_iucv_private->lock |
| 614 | */ |
| 615 | static void hvc_iucv_notifier_del(struct hvc_struct *hp, int id) |
| 616 | { |
| 617 | struct hvc_iucv_private *priv; |
| 618 | struct iucv_path *path; |
| 619 | |
| 620 | priv = hvc_iucv_get_private(id); |
| 621 | if (!priv) |
| 622 | return; |
| 623 | |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 624 | flush_sndbuf_sync(priv); |
| 625 | |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 626 | spin_lock_bh(&priv->lock); |
| 627 | path = priv->path; /* save reference to IUCV path */ |
| 628 | priv->path = NULL; |
| 629 | hvc_iucv_cleanup(priv); |
| 630 | spin_unlock_bh(&priv->lock); |
| 631 | |
| 632 | /* sever IUCV path outside of priv->lock due to lock ordering of: |
| 633 | * priv->lock <--> iucv_table_lock */ |
| 634 | if (path) { |
| 635 | iucv_path_sever(path, NULL); |
| 636 | iucv_path_free(path); |
| 637 | } |
| 638 | } |
| 639 | |
| 640 | /** |
| 641 | * hvc_iucv_path_pending() - IUCV handler to process a connection request. |
| 642 | * @path: Pending path (struct iucv_path) |
| 643 | * @ipvmid: Originator z/VM system identifier |
| 644 | * @ipuser: User specified data for this path |
| 645 | * (AF_IUCV: port/service name and originator port) |
| 646 | * |
| 647 | * The function uses the @ipuser data to check to determine if the pending |
| 648 | * path belongs to a terminal managed by this HVC backend. |
| 649 | * If the check is successful, then an additional check is done to ensure |
| 650 | * that a terminal cannot be accessed multiple times (only one connection |
| 651 | * to a terminal is allowed). In that particular case, the pending path is |
| 652 | * severed. If it is the first connection, the pending path is accepted and |
| 653 | * associated to the struct hvc_iucv_private. The iucv state is updated to |
| 654 | * reflect that a communication path has been established. |
| 655 | * |
| 656 | * Returns 0 if the path belongs to a terminal managed by the this HVC backend; |
| 657 | * otherwise returns -ENODEV in order to dispatch this path to other handlers. |
| 658 | * |
| 659 | * Locking: struct hvc_iucv_private->lock |
| 660 | */ |
| 661 | static int hvc_iucv_path_pending(struct iucv_path *path, |
| 662 | u8 ipvmid[8], u8 ipuser[16]) |
| 663 | { |
| 664 | struct hvc_iucv_private *priv; |
| 665 | u8 nuser_data[16]; |
| 666 | int i, rc; |
| 667 | |
| 668 | priv = NULL; |
| 669 | for (i = 0; i < hvc_iucv_devices; i++) |
| 670 | if (hvc_iucv_table[i] && |
| 671 | (0 == memcmp(hvc_iucv_table[i]->srv_name, ipuser, 8))) { |
| 672 | priv = hvc_iucv_table[i]; |
| 673 | break; |
| 674 | } |
| 675 | |
| 676 | if (!priv) |
| 677 | return -ENODEV; |
| 678 | |
| 679 | spin_lock(&priv->lock); |
| 680 | |
| 681 | /* If the terminal is already connected or being severed, then sever |
| 682 | * this path to enforce that there is only ONE established communication |
| 683 | * path per terminal. */ |
| 684 | if (priv->iucv_state != IUCV_DISCONN) { |
| 685 | iucv_path_sever(path, ipuser); |
| 686 | iucv_path_free(path); |
| 687 | goto out_path_handled; |
| 688 | } |
| 689 | |
| 690 | /* accept path */ |
| 691 | memcpy(nuser_data, ipuser + 8, 8); /* remote service (for af_iucv) */ |
| 692 | memcpy(nuser_data + 8, ipuser, 8); /* local service (for af_iucv) */ |
| 693 | path->msglim = 0xffff; /* IUCV MSGLIMIT */ |
| 694 | path->flags &= ~IUCV_IPRMDATA; /* TODO: use IUCV_IPRMDATA */ |
| 695 | rc = iucv_path_accept(path, &hvc_iucv_handler, nuser_data, priv); |
| 696 | if (rc) { |
| 697 | iucv_path_sever(path, ipuser); |
| 698 | iucv_path_free(path); |
| 699 | goto out_path_handled; |
| 700 | } |
| 701 | priv->path = path; |
| 702 | priv->iucv_state = IUCV_CONNECTED; |
| 703 | |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 704 | /* flush buffered output data... */ |
| 705 | schedule_delayed_work(&priv->sndbuf_work, 5); |
| 706 | |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 707 | out_path_handled: |
| 708 | spin_unlock(&priv->lock); |
| 709 | return 0; |
| 710 | } |
| 711 | |
| 712 | /** |
| 713 | * hvc_iucv_path_severed() - IUCV handler to process a path sever. |
| 714 | * @path: Pending path (struct iucv_path) |
| 715 | * @ipuser: User specified data for this path |
| 716 | * (AF_IUCV: port/service name and originator port) |
| 717 | * |
| 718 | * The function also severs the path (as required by the IUCV protocol) and |
| 719 | * sets the iucv state to IUCV_SEVERED for the associated struct |
| 720 | * hvc_iucv_private instance. Later, the IUCV_SEVERED state triggers a tty |
| 721 | * hangup (hvc_iucv_get_chars() / hvc_iucv_write()). |
| 722 | * |
| 723 | * If tty portion of the HVC is closed then clean up the outqueue in addition. |
| 724 | * |
| 725 | * Locking: struct hvc_iucv_private->lock |
| 726 | */ |
| 727 | static void hvc_iucv_path_severed(struct iucv_path *path, u8 ipuser[16]) |
| 728 | { |
| 729 | struct hvc_iucv_private *priv = path->private; |
| 730 | |
| 731 | spin_lock(&priv->lock); |
| 732 | priv->iucv_state = IUCV_SEVERED; |
| 733 | |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 734 | /* If the tty has not yet been opened, clean up the hvc_iucv_private |
| 735 | * structure to allow re-connects. |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 736 | * |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 737 | * If it has been opened, let get_chars() return -EPIPE to signal the |
| 738 | * HVC layer to hang up the tty. |
| 739 | * If so, we need to wake up the HVC thread to call get_chars()... |
| 740 | */ |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 741 | priv->path = NULL; |
| 742 | if (priv->tty_state == TTY_CLOSED) |
| 743 | hvc_iucv_cleanup(priv); |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 744 | else |
| 745 | hvc_kick(); |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 746 | spin_unlock(&priv->lock); |
| 747 | |
| 748 | /* finally sever path (outside of priv->lock due to lock ordering) */ |
| 749 | iucv_path_sever(path, ipuser); |
| 750 | iucv_path_free(path); |
| 751 | } |
| 752 | |
| 753 | /** |
| 754 | * hvc_iucv_msg_pending() - IUCV handler to process an incoming IUCV message. |
| 755 | * @path: Pending path (struct iucv_path) |
| 756 | * @msg: Pointer to the IUCV message |
| 757 | * |
| 758 | * The function stores an incoming message on the input queue for later |
| 759 | * processing (by hvc_iucv_get_chars() / hvc_iucv_write()). |
| 760 | * However, if the tty has not yet been opened, the message is rejected. |
| 761 | * |
| 762 | * Locking: struct hvc_iucv_private->lock |
| 763 | */ |
| 764 | static void hvc_iucv_msg_pending(struct iucv_path *path, |
| 765 | struct iucv_message *msg) |
| 766 | { |
| 767 | struct hvc_iucv_private *priv = path->private; |
| 768 | struct iucv_tty_buffer *rb; |
| 769 | |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 770 | /* reject messages that exceed max size of iucv_tty_msg->datalen */ |
| 771 | if (msg->length > MSG_SIZE(MSG_MAX_DATALEN)) { |
| 772 | iucv_message_reject(path, msg); |
| 773 | return; |
| 774 | } |
| 775 | |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 776 | spin_lock(&priv->lock); |
| 777 | |
| 778 | /* reject messages if tty has not yet been opened */ |
| 779 | if (priv->tty_state == TTY_CLOSED) { |
| 780 | iucv_message_reject(path, msg); |
| 781 | goto unlock_return; |
| 782 | } |
| 783 | |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 784 | /* allocate tty buffer to save iucv msg only */ |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 785 | rb = alloc_tty_buffer(0, GFP_ATOMIC); |
| 786 | if (!rb) { |
| 787 | iucv_message_reject(path, msg); |
| 788 | goto unlock_return; /* -ENOMEM */ |
| 789 | } |
| 790 | rb->msg = *msg; |
| 791 | |
| 792 | list_add_tail(&rb->list, &priv->tty_inqueue); |
| 793 | |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 794 | hvc_kick(); /* wake up hvc console thread */ |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 795 | |
| 796 | unlock_return: |
| 797 | spin_unlock(&priv->lock); |
| 798 | } |
| 799 | |
| 800 | /** |
| 801 | * hvc_iucv_msg_complete() - IUCV handler to process message completion |
| 802 | * @path: Pending path (struct iucv_path) |
| 803 | * @msg: Pointer to the IUCV message |
| 804 | * |
| 805 | * The function is called upon completion of message delivery and the |
| 806 | * message is removed from the outqueue. Additional delivery information |
| 807 | * can be found in msg->audit: rejected messages (0x040000 (IPADRJCT)) and |
| 808 | * purged messages (0x010000 (IPADPGNR)). |
| 809 | * |
| 810 | * Locking: struct hvc_iucv_private->lock |
| 811 | */ |
| 812 | static void hvc_iucv_msg_complete(struct iucv_path *path, |
| 813 | struct iucv_message *msg) |
| 814 | { |
| 815 | struct hvc_iucv_private *priv = path->private; |
| 816 | struct iucv_tty_buffer *ent, *next; |
| 817 | LIST_HEAD(list_remove); |
| 818 | |
| 819 | spin_lock(&priv->lock); |
| 820 | list_for_each_entry_safe(ent, next, &priv->tty_outqueue, list) |
| 821 | if (ent->msg.id == msg->id) { |
| 822 | list_move(&ent->list, &list_remove); |
| 823 | break; |
| 824 | } |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 825 | wake_up(&priv->sndbuf_waitq); |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 826 | spin_unlock(&priv->lock); |
| 827 | destroy_tty_buffer_list(&list_remove); |
| 828 | } |
| 829 | |
| 830 | |
| 831 | /* HVC operations */ |
| 832 | static struct hv_ops hvc_iucv_ops = { |
| 833 | .get_chars = hvc_iucv_get_chars, |
| 834 | .put_chars = hvc_iucv_put_chars, |
| 835 | .notifier_add = hvc_iucv_notifier_add, |
| 836 | .notifier_del = hvc_iucv_notifier_del, |
| 837 | .notifier_hangup = hvc_iucv_notifier_hangup, |
| 838 | }; |
| 839 | |
| 840 | /** |
| 841 | * hvc_iucv_alloc() - Allocates a new struct hvc_iucv_private instance |
| 842 | * @id: hvc_iucv_table index |
| 843 | * |
| 844 | * This function allocates a new hvc_iucv_private struct and put the |
| 845 | * instance into hvc_iucv_table at index @id. |
| 846 | * Returns 0 on success; otherwise non-zero. |
| 847 | */ |
| 848 | static int __init hvc_iucv_alloc(int id) |
| 849 | { |
| 850 | struct hvc_iucv_private *priv; |
| 851 | char name[9]; |
| 852 | int rc; |
| 853 | |
| 854 | priv = kzalloc(sizeof(struct hvc_iucv_private), GFP_KERNEL); |
| 855 | if (!priv) |
| 856 | return -ENOMEM; |
| 857 | |
| 858 | spin_lock_init(&priv->lock); |
| 859 | INIT_LIST_HEAD(&priv->tty_outqueue); |
| 860 | INIT_LIST_HEAD(&priv->tty_inqueue); |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 861 | INIT_DELAYED_WORK(&priv->sndbuf_work, hvc_iucv_sndbuf_work); |
| 862 | init_waitqueue_head(&priv->sndbuf_waitq); |
| 863 | |
| 864 | priv->sndbuf = (void *) get_zeroed_page(GFP_KERNEL); |
| 865 | if (!priv->sndbuf) { |
| 866 | kfree(priv); |
| 867 | return -ENOMEM; |
| 868 | } |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 869 | |
| 870 | /* Finally allocate hvc */ |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 871 | priv->hvc = hvc_alloc(HVC_IUCV_MAGIC + id, /* PAGE_SIZE */ |
| 872 | HVC_IUCV_MAGIC + id, &hvc_iucv_ops, 256); |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 873 | if (IS_ERR(priv->hvc)) { |
| 874 | rc = PTR_ERR(priv->hvc); |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 875 | free_page((unsigned long) priv->sndbuf); |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 876 | kfree(priv); |
| 877 | return rc; |
| 878 | } |
| 879 | |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 880 | /* kick khvcd thread; instead of using polling */ |
| 881 | priv->hvc->irq_requested = 1; |
| 882 | |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 883 | /* setup iucv related information */ |
Hendrik Brueckner | 2dc184c | 2009-01-09 12:14:57 +0100 | [diff] [blame] | 884 | snprintf(name, 9, "lnxhvc%-2d", id); |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 885 | memcpy(priv->srv_name, name, 8); |
| 886 | ASCEBC(priv->srv_name, 8); |
| 887 | |
| 888 | hvc_iucv_table[id] = priv; |
| 889 | return 0; |
| 890 | } |
| 891 | |
| 892 | /** |
| 893 | * hvc_iucv_init() - Initialization of HVC backend for z/VM IUCV |
| 894 | */ |
| 895 | static int __init hvc_iucv_init(void) |
| 896 | { |
| 897 | int rc, i; |
| 898 | |
| 899 | if (!MACHINE_IS_VM) { |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 900 | pr_info("The z/VM IUCV HVC device driver cannot " |
| 901 | "be used without z/VM\n"); |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 902 | return -ENODEV; |
| 903 | } |
| 904 | |
| 905 | if (!hvc_iucv_devices) |
| 906 | return -ENODEV; |
| 907 | |
| 908 | if (hvc_iucv_devices > MAX_HVC_IUCV_LINES) |
| 909 | return -EINVAL; |
| 910 | |
| 911 | hvc_iucv_buffer_cache = kmem_cache_create(KMSG_COMPONENT, |
| 912 | sizeof(struct iucv_tty_buffer), |
| 913 | 0, 0, NULL); |
| 914 | if (!hvc_iucv_buffer_cache) { |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 915 | pr_err("Allocating memory failed with reason code=%d\n", 1); |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 916 | return -ENOMEM; |
| 917 | } |
| 918 | |
| 919 | hvc_iucv_mempool = mempool_create_slab_pool(MEMPOOL_MIN_NR, |
| 920 | hvc_iucv_buffer_cache); |
| 921 | if (!hvc_iucv_mempool) { |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 922 | pr_err("Allocating memory failed with reason code=%d\n", 2); |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 923 | kmem_cache_destroy(hvc_iucv_buffer_cache); |
| 924 | return -ENOMEM; |
| 925 | } |
| 926 | |
| 927 | /* allocate hvc_iucv_private structs */ |
| 928 | for (i = 0; i < hvc_iucv_devices; i++) { |
| 929 | rc = hvc_iucv_alloc(i); |
| 930 | if (rc) { |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 931 | pr_err("Creating a new HVC terminal device " |
| 932 | "failed with error code=%d\n", rc); |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 933 | goto out_error_hvc; |
| 934 | } |
| 935 | } |
| 936 | |
| 937 | /* register IUCV callback handler */ |
| 938 | rc = iucv_register(&hvc_iucv_handler, 0); |
| 939 | if (rc) { |
Hendrik Brueckner | c45ce4b | 2009-01-09 12:14:58 +0100 | [diff] [blame^] | 940 | pr_err("Registering IUCV handlers failed with error code=%d\n", |
| 941 | rc); |
Hendrik Brueckner | 44a01d5 | 2008-12-25 13:38:57 +0100 | [diff] [blame] | 942 | goto out_error_iucv; |
| 943 | } |
| 944 | |
| 945 | return 0; |
| 946 | |
| 947 | out_error_iucv: |
| 948 | iucv_unregister(&hvc_iucv_handler, 0); |
| 949 | out_error_hvc: |
| 950 | for (i = 0; i < hvc_iucv_devices; i++) |
| 951 | if (hvc_iucv_table[i]) { |
| 952 | if (hvc_iucv_table[i]->hvc) |
| 953 | hvc_remove(hvc_iucv_table[i]->hvc); |
| 954 | kfree(hvc_iucv_table[i]); |
| 955 | } |
| 956 | mempool_destroy(hvc_iucv_mempool); |
| 957 | kmem_cache_destroy(hvc_iucv_buffer_cache); |
| 958 | return rc; |
| 959 | } |
| 960 | |
| 961 | /** |
| 962 | * hvc_iucv_console_init() - Early console initialization |
| 963 | */ |
| 964 | static int __init hvc_iucv_console_init(void) |
| 965 | { |
| 966 | if (!MACHINE_IS_VM || !hvc_iucv_devices) |
| 967 | return -ENODEV; |
| 968 | return hvc_instantiate(HVC_IUCV_MAGIC, 0, &hvc_iucv_ops); |
| 969 | } |
| 970 | |
| 971 | /** |
| 972 | * hvc_iucv_config() - Parsing of hvc_iucv= kernel command line parameter |
| 973 | * @val: Parameter value (numeric) |
| 974 | */ |
| 975 | static int __init hvc_iucv_config(char *val) |
| 976 | { |
| 977 | return strict_strtoul(val, 10, &hvc_iucv_devices); |
| 978 | } |
| 979 | |
| 980 | |
| 981 | module_init(hvc_iucv_init); |
| 982 | console_initcall(hvc_iucv_console_init); |
| 983 | __setup("hvc_iucv=", hvc_iucv_config); |
| 984 | |
| 985 | MODULE_LICENSE("GPL"); |
| 986 | MODULE_DESCRIPTION("HVC back-end for z/VM IUCV."); |
| 987 | MODULE_AUTHOR("Hendrik Brueckner <brueckner@linux.vnet.ibm.com>"); |