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Edit File: iucv.h

/* SPDX-License-Identifier: GPL-2.0 */ /* * drivers/s390/net/iucv.h * IUCV base support. * * S390 version * Copyright 2000, 2006 IBM Corporation * Author(s):Alan Altmark (Alan_Altmark@us.ibm.com) * Xenia Tkatschow (xenia@us.ibm.com) * Rewritten for af_iucv: * Martin Schwidefsky <schwidefsky@de.ibm.com> * * * Functionality: * To explore any of the IUCV functions, one must first register their * program using iucv_register(). Once your program has successfully * completed a register, it can exploit the other functions. * For furthur reference on all IUCV functionality, refer to the * CP Programming Services book, also available on the web thru * www.vm.ibm.com/pubs, manual # SC24-6084 * * Definition of Return Codes * - All positive return codes including zero are reflected back * from CP. The definition of each return code can be found in * CP Programming Services book. * - Return Code of: * -EINVAL: Invalid value * -ENOMEM: storage allocation failed */ #include <linux/types.h> #include <linux/slab.h> #include <asm/debug.h> /* * IUCV option flags usable by device drivers: * * IUCV_IPRMDATA Indicates that your program can handle a message in the * parameter list / a message is sent in the parameter list. * Used for iucv_path_accept, iucv_path_connect, * iucv_message_reply, iucv_message_send, iucv_message_send2way. * IUCV_IPQUSCE Indicates that you do not want to receive messages on this * path until an iucv_path_resume is issued. * Used for iucv_path_accept, iucv_path_connect. * IUCV_IPBUFLST Indicates that an address list is used for the message data. * Used for iucv_message_receive, iucv_message_send, * iucv_message_send2way. * IUCV_IPPRTY Specifies that you want to send priority messages. * Used for iucv_path_accept, iucv_path_connect, * iucv_message_reply, iucv_message_send, iucv_message_send2way. * IUCV_IPSYNC Indicates a synchronous send request. * Used for iucv_message_send, iucv_message_send2way. * IUCV_IPANSLST Indicates that an address list is used for the reply data. * Used for iucv_message_reply, iucv_message_send2way. * IUCV_IPLOCAL Specifies that the communication partner has to be on the * local system. If local is specified no target class can be * specified. * Used for iucv_path_connect. * * All flags are defined in the input field IPFLAGS1 of each function * and can be found in CP Programming Services. */ #define IUCV_IPRMDATA 0x80 #define IUCV_IPQUSCE 0x40 #define IUCV_IPBUFLST 0x40 #define IUCV_IPPRTY 0x20 #define IUCV_IPANSLST 0x08 #define IUCV_IPSYNC 0x04 #define IUCV_IPLOCAL 0x01 /* * iucv_array : Defines buffer array. * Inside the array may be 31- bit addresses and 31-bit lengths. * Use a pointer to an iucv_array as the buffer, reply or answer * parameter on iucv_message_send, iucv_message_send2way, iucv_message_receive * and iucv_message_reply if IUCV_IPBUFLST or IUCV_IPANSLST are used. */ struct iucv_array { u32 address; u32 length; } __attribute__ ((aligned (8))); extern struct bus_type iucv_bus; extern struct device *iucv_root; /* * struct iucv_path * pathid: 16 bit path identification * msglim: 16 bit message limit * flags: properties of the path: IPRMDATA, IPQUSCE, IPPRTY * handler: address of iucv handler structure * private: private information of the handler associated with the path * list: list_head for the iucv_handler path list. */ struct iucv_path { u16 pathid; u16 msglim; u8 flags; void *private; struct iucv_handler *handler; struct list_head list; }; /* * struct iucv_message * id: 32 bit message id * audit: 32 bit error information of purged or replied messages * class: 32 bit target class of a message (source class for replies) * tag: 32 bit tag to be associated with the message * length: 32 bit length of the message / reply * reply_size: 32 bit maximum allowed length of the reply * rmmsg: 8 byte inline message * flags: message properties (IUCV_IPPRTY) */ struct iucv_message { u32 id; u32 audit; u32 class; u32 tag; u32 length; u32 reply_size; u8 rmmsg[8]; u8 flags; } __packed; /* * struct iucv_handler * * A vector of functions that handle IUCV interrupts. Each functions gets * a parameter area as defined by the CP Programming Services and private * pointer that is provided by the user of the interface. */ struct iucv_handler { /* * The path_pending function is called after an iucv interrupt * type 0x01 has been received. The base code allocates a path * structure and "asks" the handler if this path belongs to the * handler. To accept the path the path_pending function needs * to call iucv_path_accept and return 0. If the callback returns * a value != 0 the iucv base code will continue with the next * handler. The order in which the path_pending functions are * called is the order of the registration of the iucv handlers * to the base code. */ int (*path_pending)(struct iucv_path *, u8 *ipvmid, u8 *ipuser); /* * The path_complete function is called after an iucv interrupt * type 0x02 has been received for a path that has been established * for this handler with iucv_path_connect and got accepted by the * peer with iucv_path_accept. */ void (*path_complete)(struct iucv_path *, u8 *ipuser); /* * The path_severed function is called after an iucv interrupt * type 0x03 has been received. The communication peer shutdown * his end of the communication path. The path still exists and * remaining messages can be received until a iucv_path_sever * shuts down the other end of the path as well. */ void (*path_severed)(struct iucv_path *, u8 *ipuser); /* * The path_quiesced function is called after an icuv interrupt * type 0x04 has been received. The communication peer has quiesced * the path. Delivery of messages is stopped until iucv_path_resume * has been called. */ void (*path_quiesced)(struct iucv_path *, u8 *ipuser); /* * The path_resumed function is called after an icuv interrupt * type 0x05 has been received. The communication peer has resumed * the path. */ void (*path_resumed)(struct iucv_path *, u8 *ipuser); /* * The message_pending function is called after an icuv interrupt * type 0x06 or type 0x07 has been received. A new message is * available and can be received with iucv_message_receive. */ void (*message_pending)(struct iucv_path *, struct iucv_message *); /* * The message_complete function is called after an icuv interrupt * type 0x08 or type 0x09 has been received. A message send with * iucv_message_send2way has been replied to. The reply can be * received with iucv_message_receive. */ void (*message_complete)(struct iucv_path *, struct iucv_message *); struct list_head list; struct list_head paths; }; /** * iucv_register: * @handler: address of iucv handler structure * @smp: != 0 indicates that the handler can deal with out of order messages * * Registers a driver with IUCV. * * Returns 0 on success, -ENOMEM if the memory allocation for the pathid * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus. */ int iucv_register(struct iucv_handler *handler, int smp); /** * iucv_unregister * @handler: address of iucv handler structure * @smp: != 0 indicates that the handler can deal with out of order messages * * Unregister driver from IUCV. */ void iucv_unregister(struct iucv_handler *handle, int smp); /** * iucv_path_alloc * @msglim: initial message limit * @flags: initial flags * @gfp: kmalloc allocation flag * * Allocate a new path structure for use with iucv_connect. * * Returns NULL if the memory allocation failed or a pointer to the * path structure. */ static inline struct iucv_path *iucv_path_alloc(u16 msglim, u8 flags, gfp_t gfp) { struct iucv_path *path; path = kzalloc(sizeof(struct iucv_path), gfp); if (path) { path->msglim = msglim; path->flags = flags; } return path; } /** * iucv_path_free * @path: address of iucv path structure * * Frees a path structure. */ static inline void iucv_path_free(struct iucv_path *path) { kfree(path); } /** * iucv_path_accept * @path: address of iucv path structure * @handler: address of iucv handler structure * @userdata: 16 bytes of data reflected to the communication partner * @private: private data passed to interrupt handlers for this path * * This function is issued after the user received a connection pending * external interrupt and now wishes to complete the IUCV communication path. * * Returns the result of the CP IUCV call. */ int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler, u8 *userdata, void *private); /** * iucv_path_connect * @path: address of iucv path structure * @handler: address of iucv handler structure * @userid: 8-byte user identification * @system: 8-byte target system identification * @userdata: 16 bytes of data reflected to the communication partner * @private: private data passed to interrupt handlers for this path * * This function establishes an IUCV path. Although the connect may complete * successfully, you are not able to use the path until you receive an IUCV * Connection Complete external interrupt. * * Returns the result of the CP IUCV call. */ int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler, u8 *userid, u8 *system, u8 *userdata, void *private); /** * iucv_path_quiesce: * @path: address of iucv path structure * @userdata: 16 bytes of data reflected to the communication partner * * This function temporarily suspends incoming messages on an IUCV path. * You can later reactivate the path by invoking the iucv_resume function. * * Returns the result from the CP IUCV call. */ int iucv_path_quiesce(struct iucv_path *path, u8 *userdata); /** * iucv_path_resume: * @path: address of iucv path structure * @userdata: 16 bytes of data reflected to the communication partner * * This function resumes incoming messages on an IUCV path that has * been stopped with iucv_path_quiesce. * * Returns the result from the CP IUCV call. */ int iucv_path_resume(struct iucv_path *path, u8 *userdata); /** * iucv_path_sever * @path: address of iucv path structure * @userdata: 16 bytes of data reflected to the communication partner * * This function terminates an IUCV path. * * Returns the result from the CP IUCV call. */ int iucv_path_sever(struct iucv_path *path, u8 *userdata); /** * iucv_message_purge * @path: address of iucv path structure * @msg: address of iucv msg structure * @srccls: source class of message * * Cancels a message you have sent. * * Returns the result from the CP IUCV call. */ int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg, u32 srccls); /** * iucv_message_receive * @path: address of iucv path structure * @msg: address of iucv msg structure * @flags: flags that affect how the message is received (IUCV_IPBUFLST) * @buffer: address of data buffer or address of struct iucv_array * @size: length of data buffer * @residual: * * This function receives messages that are being sent to you over * established paths. This function will deal with RMDATA messages * embedded in struct iucv_message as well. * * Locking: local_bh_enable/local_bh_disable * * Returns the result from the CP IUCV call. */ int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, u8 flags, void *buffer, size_t size, size_t *residual); /** * __iucv_message_receive * @path: address of iucv path structure * @msg: address of iucv msg structure * @flags: flags that affect how the message is received (IUCV_IPBUFLST) * @buffer: address of data buffer or address of struct iucv_array * @size: length of data buffer * @residual: * * This function receives messages that are being sent to you over * established paths. This function will deal with RMDATA messages * embedded in struct iucv_message as well. * * Locking: no locking. * * Returns the result from the CP IUCV call. */ int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg, u8 flags, void *buffer, size_t size, size_t *residual); /** * iucv_message_reject * @path: address of iucv path structure * @msg: address of iucv msg structure * * The reject function refuses a specified message. Between the time you * are notified of a message and the time that you complete the message, * the message may be rejected. * * Returns the result from the CP IUCV call. */ int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg); /** * iucv_message_reply * @path: address of iucv path structure * @msg: address of iucv msg structure * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) * @reply: address of data buffer or address of struct iucv_array * @size: length of reply data buffer * * This function responds to the two-way messages that you receive. You * must identify completely the message to which you wish to reply. ie, * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into * the parameter list. * * Returns the result from the CP IUCV call. */ int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg, u8 flags, void *reply, size_t size); /** * iucv_message_send * @path: address of iucv path structure * @msg: address of iucv msg structure * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) * @srccls: source class of message * @buffer: address of data buffer or address of struct iucv_array * @size: length of send buffer * * This function transmits data to another application. Data to be * transmitted is in a buffer and this is a one-way message and the * receiver will not reply to the message. * * Locking: local_bh_enable/local_bh_disable * * Returns the result from the CP IUCV call. */ int iucv_message_send(struct iucv_path *path, struct iucv_message *msg, u8 flags, u32 srccls, void *buffer, size_t size); /** * __iucv_message_send * @path: address of iucv path structure * @msg: address of iucv msg structure * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST) * @srccls: source class of message * @buffer: address of data buffer or address of struct iucv_array * @size: length of send buffer * * This function transmits data to another application. Data to be * transmitted is in a buffer and this is a one-way message and the * receiver will not reply to the message. * * Locking: no locking. * * Returns the result from the CP IUCV call. */ int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg, u8 flags, u32 srccls, void *buffer, size_t size); /** * iucv_message_send2way * @path: address of iucv path structure * @msg: address of iucv msg structure * @flags: how the message is sent and the reply is received * (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST) * @srccls: source class of message * @buffer: address of data buffer or address of struct iucv_array * @size: length of send buffer * @ansbuf: address of answer buffer or address of struct iucv_array * @asize: size of reply buffer * * This function transmits data to another application. Data to be * transmitted is in a buffer. The receiver of the send is expected to * reply to the message and a buffer is provided into which IUCV moves * the reply to this message. * * Returns the result from the CP IUCV call. */ int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg, u8 flags, u32 srccls, void *buffer, size_t size, void *answer, size_t asize, size_t *residual); struct iucv_interface { int (*message_receive)(struct iucv_path *path, struct iucv_message *msg, u8 flags, void *buffer, size_t size, size_t *residual); int (*__message_receive)(struct iucv_path *path, struct iucv_message *msg, u8 flags, void *buffer, size_t size, size_t *residual); int (*message_reply)(struct iucv_path *path, struct iucv_message *msg, u8 flags, void *reply, size_t size); int (*message_reject)(struct iucv_path *path, struct iucv_message *msg); int (*message_send)(struct iucv_path *path, struct iucv_message *msg, u8 flags, u32 srccls, void *buffer, size_t size); int (*__message_send)(struct iucv_path *path, struct iucv_message *msg, u8 flags, u32 srccls, void *buffer, size_t size); int (*message_send2way)(struct iucv_path *path, struct iucv_message *msg, u8 flags, u32 srccls, void *buffer, size_t size, void *answer, size_t asize, size_t *residual); int (*message_purge)(struct iucv_path *path, struct iucv_message *msg, u32 srccls); int (*path_accept)(struct iucv_path *path, struct iucv_handler *handler, u8 userdata[16], void *private); int (*path_connect)(struct iucv_path *path, struct iucv_handler *handler, u8 userid[8], u8 system[8], u8 userdata[16], void *private); int (*path_quiesce)(struct iucv_path *path, u8 userdata[16]); int (*path_resume)(struct iucv_path *path, u8 userdata[16]); int (*path_sever)(struct iucv_path *path, u8 userdata[16]); int (*iucv_register)(struct iucv_handler *handler, int smp); void (*iucv_unregister)(struct iucv_handler *handler, int smp); struct bus_type *bus; struct device *root; }; extern struct iucv_interface iucv_if;