include/net/iucv/iucv.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  drivers/s390/net/iucv.h
   4  *    IUCV base support.
   5  *
   6  *  S390 version
   7  *    Copyright 2000, 2006 IBM Corporation
   8  *    Author(s):Alan Altmark (Alan_Altmark@us.ibm.com)
   9  *              Xenia Tkatschow (xenia@us.ibm.com)
  10  *    Rewritten for af_iucv:
  11  *      Martin Schwidefsky <schwidefsky@de.ibm.com>
  12  *
  13  *
  14  * Functionality:
  15  * To explore any of the IUCV functions, one must first register their
  16  * program using iucv_register(). Once your program has successfully
  17  * completed a register, it can exploit the other functions.
  18  * For furthur reference on all IUCV functionality, refer to the
  19  * CP Programming Services book, also available on the web thru
  20  * www.vm.ibm.com/pubs, manual # SC24-6084
  21  *
  22  * Definition of Return Codes
  23  * - All positive return codes including zero are reflected back
  24  *   from CP. The definition of each return code can be found in
  25  *   CP Programming Services book.
  26  * - Return Code of:
  27  *   -EINVAL: Invalid value
  28  *   -ENOMEM: storage allocation failed
  29  */
  30
  31 #include <linux/types.h>
  32 #include <linux/slab.h>
  33 #include <asm/debug.h>
  34
  35 /*
  36  * IUCV option flags usable by device drivers:
  37  *
  38  * IUCV_IPRMDATA  Indicates that your program can handle a message in the
  39  *                parameter list / a message is sent in the parameter list.
  40  *                Used for iucv_path_accept, iucv_path_connect,
  41  *                iucv_message_reply, iucv_message_send, iucv_message_send2way.
  42  * IUCV_IPQUSCE   Indicates that you do not want to receive messages on this
  43  *                path until an iucv_path_resume is issued.
  44  *                Used for iucv_path_accept, iucv_path_connect.
  45  * IUCV_IPBUFLST  Indicates that an address list is used for the message data.
  46  *                Used for iucv_message_receive, iucv_message_send,
  47  *                iucv_message_send2way.
  48  * IUCV_IPPRTY    Specifies that you want to send priority messages.
  49  *                Used for iucv_path_accept, iucv_path_connect,
  50  *                iucv_message_reply, iucv_message_send, iucv_message_send2way.
  51  * IUCV_IPSYNC    Indicates a synchronous send request.
  52  *                Used for iucv_message_send, iucv_message_send2way.
  53  * IUCV_IPANSLST  Indicates that an address list is used for the reply data.
  54  *                Used for iucv_message_reply, iucv_message_send2way.
  55  * IUCV_IPLOCAL   Specifies that the communication partner has to be on the
  56  *                local system. If local is specified no target class can be
  57  *                specified.
  58  *                Used for iucv_path_connect.
  59  *
  60  * All flags are defined in the input field IPFLAGS1 of each function
  61  * and can be found in CP Programming Services.
  62  */
  63 #define IUCV_IPRMDATA   0x80
  64 #define IUCV_IPQUSCE    0x40
  65 #define IUCV_IPBUFLST   0x40
  66 #define IUCV_IPPRTY     0x20
  67 #define IUCV_IPANSLST   0x08
  68 #define IUCV_IPSYNC     0x04
  69 #define IUCV_IPLOCAL    0x01
  70
  71 /*
  72  * iucv_array : Defines buffer array.
  73  * Inside the array may be 31- bit addresses and 31-bit lengths.
  74  * Use a pointer to an iucv_array as the buffer, reply or answer
  75  * parameter on iucv_message_send, iucv_message_send2way, iucv_message_receive
  76  * and iucv_message_reply if IUCV_IPBUFLST or IUCV_IPANSLST are used.
  77  */
  78 struct iucv_array {
  79         u32 address;
  80         u32 length;
  81 } __attribute__ ((aligned (8)));
  82
  83 extern struct bus_type iucv_bus;
  84 extern struct device *iucv_root;
  85
  86 /*
  87  * struct iucv_path
  88  * pathid: 16 bit path identification
  89  * msglim: 16 bit message limit
  90  * flags: properties of the path: IPRMDATA, IPQUSCE, IPPRTY
  91  * handler:  address of iucv handler structure
  92  * private: private information of the handler associated with the path
  93  * list: list_head for the iucv_handler path list.
  94  */
  95 struct iucv_path {
  96         u16 pathid;
  97         u16 msglim;
  98         u8  flags;
  99         void *private;
 100         struct iucv_handler *handler;
 101         struct list_head list;
 102 };
 103
 104 /*
 105  * struct iucv_message
 106  * id: 32 bit message id
 107  * audit: 32 bit error information of purged or replied messages
 108  * class: 32 bit target class of a message (source class for replies)
 109  * tag: 32 bit tag to be associated with the message
 110  * length: 32 bit length of the message / reply
 111  * reply_size: 32 bit maximum allowed length of the reply
 112  * rmmsg: 8 byte inline message
 113  * flags: message properties (IUCV_IPPRTY)
 114  */
 115 struct iucv_message {
 116         u32 id;
 117         u32 audit;
 118         u32 class;
 119         u32 tag;
 120         u32 length;
 121         u32 reply_size;
 122         u8  rmmsg[8];
 123         u8  flags;
 124 } __packed;
 125
 126 /*
 127  * struct iucv_handler
 128  *
 129  * A vector of functions that handle IUCV interrupts. Each functions gets
 130  * a parameter area as defined by the CP Programming Services and private
 131  * pointer that is provided by the user of the interface.
 132  */
 133 struct iucv_handler {
 134          /*
 135           * The path_pending function is called after an iucv interrupt
 136           * type 0x01 has been received. The base code allocates a path
 137           * structure and "asks" the handler if this path belongs to the
 138           * handler. To accept the path the path_pending function needs
 139           * to call iucv_path_accept and return 0. If the callback returns
 140           * a value != 0 the iucv base code will continue with the next
 141           * handler. The order in which the path_pending functions are
 142           * called is the order of the registration of the iucv handlers
 143           * to the base code.
 144           */
 145         int  (*path_pending)(struct iucv_path *, u8 *ipvmid, u8 *ipuser);
 146         /*
 147          * The path_complete function is called after an iucv interrupt
 148          * type 0x02 has been received for a path that has been established
 149          * for this handler with iucv_path_connect and got accepted by the
 150          * peer with iucv_path_accept.
 151          */
 152         void (*path_complete)(struct iucv_path *, u8 *ipuser);
 153          /*
 154           * The path_severed function is called after an iucv interrupt
 155           * type 0x03 has been received. The communication peer shutdown
 156           * his end of the communication path. The path still exists and
 157           * remaining messages can be received until a iucv_path_sever
 158           * shuts down the other end of the path as well.
 159           */
 160         void (*path_severed)(struct iucv_path *, u8 *ipuser);
 161         /*
 162          * The path_quiesced function is called after an icuv interrupt
 163          * type 0x04 has been received. The communication peer has quiesced
 164          * the path. Delivery of messages is stopped until iucv_path_resume
 165          * has been called.
 166          */
 167         void (*path_quiesced)(struct iucv_path *, u8 *ipuser);
 168         /*
 169          * The path_resumed function is called after an icuv interrupt
 170          * type 0x05 has been received. The communication peer has resumed
 171          * the path.
 172          */
 173         void (*path_resumed)(struct iucv_path *, u8 *ipuser);
 174         /*
 175          * The message_pending function is called after an icuv interrupt
 176          * type 0x06 or type 0x07 has been received. A new message is
 177          * available and can be received with iucv_message_receive.
 178          */
 179         void (*message_pending)(struct iucv_path *, struct iucv_message *);
 180         /*
 181          * The message_complete function is called after an icuv interrupt
 182          * type 0x08 or type 0x09 has been received. A message send with
 183          * iucv_message_send2way has been replied to. The reply can be
 184          * received with iucv_message_receive.
 185          */
 186         void (*message_complete)(struct iucv_path *, struct iucv_message *);
 187
 188         struct list_head list;
 189         struct list_head paths;
 190 };
 191
 192 /**
 193  * iucv_register:
 194  * @handler: address of iucv handler structure
 195  * @smp: != 0 indicates that the handler can deal with out of order messages
 196  *
 197  * Registers a driver with IUCV.
 198  *
 199  * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
 200  * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
 201  */
 202 int iucv_register(struct iucv_handler *handler, int smp);
 203
 204 /**
 205  * iucv_unregister
 206  * @handler:  address of iucv handler structure
 207  * @smp: != 0 indicates that the handler can deal with out of order messages
 208  *
 209  * Unregister driver from IUCV.
 210  */
 211 void iucv_unregister(struct iucv_handler *handle, int smp);
 212
 213 /**
 214  * iucv_path_alloc
 215  * @msglim: initial message limit
 216  * @flags: initial flags
 217  * @gfp: kmalloc allocation flag
 218  *
 219  * Allocate a new path structure for use with iucv_connect.
 220  *
 221  * Returns NULL if the memory allocation failed or a pointer to the
 222  * path structure.
 223  */
 224 static inline struct iucv_path *iucv_path_alloc(u16 msglim, u8 flags, gfp_t gfp)
 225 {
 226         struct iucv_path *path;
 227
 228         path = kzalloc(sizeof(struct iucv_path), gfp);
 229         if (path) {
 230                 path->msglim = msglim;
 231                 path->flags = flags;
 232         }
 233         return path;
 234 }
 235
 236 /**
 237  * iucv_path_free
 238  * @path: address of iucv path structure
 239  *
 240  * Frees a path structure.
 241  */
 242 static inline void iucv_path_free(struct iucv_path *path)
 243 {
 244         kfree(path);
 245 }
 246
 247 /**
 248  * iucv_path_accept
 249  * @path: address of iucv path structure
 250  * @handler: address of iucv handler structure
 251  * @userdata: 16 bytes of data reflected to the communication partner
 252  * @private: private data passed to interrupt handlers for this path
 253  *
 254  * This function is issued after the user received a connection pending
 255  * external interrupt and now wishes to complete the IUCV communication path.
 256  *
 257  * Returns the result of the CP IUCV call.
 258  */
 259 int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
 260                      u8 *userdata, void *private);
 261
 262 /**
 263  * iucv_path_connect
 264  * @path: address of iucv path structure
 265  * @handler: address of iucv handler structure
 266  * @userid: 8-byte user identification
 267  * @system: 8-byte target system identification
 268  * @userdata: 16 bytes of data reflected to the communication partner
 269  * @private: private data passed to interrupt handlers for this path
 270  *
 271  * This function establishes an IUCV path. Although the connect may complete
 272  * successfully, you are not able to use the path until you receive an IUCV
 273  * Connection Complete external interrupt.
 274  *
 275  * Returns the result of the CP IUCV call.
 276  */
 277 int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
 278                       u8 *userid, u8 *system, u8 *userdata,
 279                       void *private);
 280
 281 /**
 282  * iucv_path_quiesce:
 283  * @path: address of iucv path structure
 284  * @userdata: 16 bytes of data reflected to the communication partner
 285  *
 286  * This function temporarily suspends incoming messages on an IUCV path.
 287  * You can later reactivate the path by invoking the iucv_resume function.
 288  *
 289  * Returns the result from the CP IUCV call.
 290  */
 291 int iucv_path_quiesce(struct iucv_path *path, u8 *userdata);
 292
 293 /**
 294  * iucv_path_resume:
 295  * @path: address of iucv path structure
 296  * @userdata: 16 bytes of data reflected to the communication partner
 297  *
 298  * This function resumes incoming messages on an IUCV path that has
 299  * been stopped with iucv_path_quiesce.
 300  *
 301  * Returns the result from the CP IUCV call.
 302  */
 303 int iucv_path_resume(struct iucv_path *path, u8 *userdata);
 304
 305 /**
 306  * iucv_path_sever
 307  * @path: address of iucv path structure
 308  * @userdata: 16 bytes of data reflected to the communication partner
 309  *
 310  * This function terminates an IUCV path.
 311  *
 312  * Returns the result from the CP IUCV call.
 313  */
 314 int iucv_path_sever(struct iucv_path *path, u8 *userdata);
 315
 316 /**
 317  * iucv_message_purge
 318  * @path: address of iucv path structure
 319  * @msg: address of iucv msg structure
 320  * @srccls: source class of message
 321  *
 322  * Cancels a message you have sent.
 323  *
 324  * Returns the result from the CP IUCV call.
 325  */
 326 int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
 327                        u32 srccls);
 328
 329 /**
 330  * iucv_message_receive
 331  * @path: address of iucv path structure
 332  * @msg: address of iucv msg structure
 333  * @flags: flags that affect how the message is received (IUCV_IPBUFLST)
 334  * @buffer: address of data buffer or address of struct iucv_array
 335  * @size: length of data buffer
 336  * @residual:
 337  *
 338  * This function receives messages that are being sent to you over
 339  * established paths. This function will deal with RMDATA messages
 340  * embedded in struct iucv_message as well.
 341  *
 342  * Locking:     local_bh_enable/local_bh_disable
 343  *
 344  * Returns the result from the CP IUCV call.
 345  */
 346 int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
 347                          u8 flags, void *buffer, size_t size, size_t *residual);
 348
 349 /**
 350  * __iucv_message_receive
 351  * @path: address of iucv path structure
 352  * @msg: address of iucv msg structure
 353  * @flags: flags that affect how the message is received (IUCV_IPBUFLST)
 354  * @buffer: address of data buffer or address of struct iucv_array
 355  * @size: length of data buffer
 356  * @residual:
 357  *
 358  * This function receives messages that are being sent to you over
 359  * established paths. This function will deal with RMDATA messages
 360  * embedded in struct iucv_message as well.
 361  *
 362  * Locking:     no locking.
 363  *
 364  * Returns the result from the CP IUCV call.
 365  */
 366 int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
 367                            u8 flags, void *buffer, size_t size,
 368                            size_t *residual);
 369
 370 /**
 371  * iucv_message_reject
 372  * @path: address of iucv path structure
 373  * @msg: address of iucv msg structure
 374  *
 375  * The reject function refuses a specified message. Between the time you
 376  * are notified of a message and the time that you complete the message,
 377  * the message may be rejected.
 378  *
 379  * Returns the result from the CP IUCV call.
 380  */
 381 int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg);
 382
 383 /**
 384  * iucv_message_reply
 385  * @path: address of iucv path structure
 386  * @msg: address of iucv msg structure
 387  * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
 388  * @reply: address of data buffer or address of struct iucv_array
 389  * @size: length of reply data buffer
 390  *
 391  * This function responds to the two-way messages that you receive. You
 392  * must identify completely the message to which you wish to reply. ie,
 393  * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
 394  * the parameter list.
 395  *
 396  * Returns the result from the CP IUCV call.
 397  */
 398 int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
 399                        u8 flags, void *reply, size_t size);
 400
 401 /**
 402  * iucv_message_send
 403  * @path: address of iucv path structure
 404  * @msg: address of iucv msg structure
 405  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
 406  * @srccls: source class of message
 407  * @buffer: address of data buffer or address of struct iucv_array
 408  * @size: length of send buffer
 409  *
 410  * This function transmits data to another application. Data to be
 411  * transmitted is in a buffer and this is a one-way message and the
 412  * receiver will not reply to the message.
 413  *
 414  * Locking:     local_bh_enable/local_bh_disable
 415  *
 416  * Returns the result from the CP IUCV call.
 417  */
 418 int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
 419                       u8 flags, u32 srccls, void *buffer, size_t size);
 420
 421 /**
 422  * __iucv_message_send
 423  * @path: address of iucv path structure
 424  * @msg: address of iucv msg structure
 425  * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
 426  * @srccls: source class of message
 427  * @buffer: address of data buffer or address of struct iucv_array
 428  * @size: length of send buffer
 429  *
 430  * This function transmits data to another application. Data to be
 431  * transmitted is in a buffer and this is a one-way message and the
 432  * receiver will not reply to the message.
 433  *
 434  * Locking:     no locking.
 435  *
 436  * Returns the result from the CP IUCV call.
 437  */
 438 int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
 439                         u8 flags, u32 srccls, void *buffer, size_t size);
 440
 441 /**
 442  * iucv_message_send2way
 443  * @path: address of iucv path structure
 444  * @msg: address of iucv msg structure
 445  * @flags: how the message is sent and the reply is received
 446  *         (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
 447  * @srccls: source class of message
 448  * @buffer: address of data buffer or address of struct iucv_array
 449  * @size: length of send buffer
 450  * @ansbuf: address of answer buffer or address of struct iucv_array
 451  * @asize: size of reply buffer
 452  *
 453  * This function transmits data to another application. Data to be
 454  * transmitted is in a buffer. The receiver of the send is expected to
 455  * reply to the message and a buffer is provided into which IUCV moves
 456  * the reply to this message.
 457  *
 458  * Returns the result from the CP IUCV call.
 459  */
 460 int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
 461                           u8 flags, u32 srccls, void *buffer, size_t size,
 462                           void *answer, size_t asize, size_t *residual);
 463
 464 struct iucv_interface {
 465         int (*message_receive)(struct iucv_path *path, struct iucv_message *msg,
 466                 u8 flags, void *buffer, size_t size, size_t *residual);
 467         int (*__message_receive)(struct iucv_path *path,
 468                 struct iucv_message *msg, u8 flags, void *buffer, size_t size,
 469                 size_t *residual);
 470         int (*message_reply)(struct iucv_path *path, struct iucv_message *msg,
 471                 u8 flags, void *reply, size_t size);
 472         int (*message_reject)(struct iucv_path *path, struct iucv_message *msg);
 473         int (*message_send)(struct iucv_path *path, struct iucv_message *msg,
 474                 u8 flags, u32 srccls, void *buffer, size_t size);
 475         int (*__message_send)(struct iucv_path *path, struct iucv_message *msg,
 476                 u8 flags, u32 srccls, void *buffer, size_t size);
 477         int (*message_send2way)(struct iucv_path *path,
 478                 struct iucv_message *msg, u8 flags, u32 srccls, void *buffer,
 479                 size_t size, void *answer, size_t asize, size_t *residual);
 480         int (*message_purge)(struct iucv_path *path, struct iucv_message *msg,
 481                 u32 srccls);
 482         int (*path_accept)(struct iucv_path *path, struct iucv_handler *handler,
 483                 u8 userdata[16], void *private);
 484         int (*path_connect)(struct iucv_path *path,
 485                 struct iucv_handler *handler,
 486                 u8 userid[8], u8 system[8], u8 userdata[16], void *private);
 487         int (*path_quiesce)(struct iucv_path *path, u8 userdata[16]);
 488         int (*path_resume)(struct iucv_path *path, u8 userdata[16]);
 489         int (*path_sever)(struct iucv_path *path, u8 userdata[16]);
 490         int (*iucv_register)(struct iucv_handler *handler, int smp);
 491         void (*iucv_unregister)(struct iucv_handler *handler, int smp);
 492         struct bus_type *bus;
 493         struct device *root;
 494 };
 495
 496 extern struct iucv_interface iucv_if;