/* * hvc_iucv.c - z/VM IUCV back-end for the Hypervisor Console (HVC) * * This back-end for HVC provides terminal access via * z/VM IUCV communication paths. * * Copyright IBM Corp. 2008. * * Author(s): Hendrik Brueckner */ #define KMSG_COMPONENT "hvc_iucv" #include #include #include #include #include #include #include "hvc_console.h" /* HVC backend for z/VM IUCV */ #define HVC_IUCV_MAGIC 0xc9e4c3e5 #define MAX_HVC_IUCV_LINES HVC_ALLOC_TTY_ADAPTERS #define MEMPOOL_MIN_NR (PAGE_SIZE / sizeof(struct iucv_tty_buffer)/4) /* IUCV TTY message */ #define MSG_VERSION 0x02 /* Message version */ #define MSG_TYPE_ERROR 0x01 /* Error message */ #define MSG_TYPE_TERMENV 0x02 /* Terminal environment variable */ #define MSG_TYPE_TERMIOS 0x04 /* Terminal IO struct update */ #define MSG_TYPE_WINSIZE 0x08 /* Terminal window size update */ #define MSG_TYPE_DATA 0x10 /* Terminal data */ #define MSG_SIZE(s) ((s) + offsetof(struct iucv_tty_msg, data)) struct iucv_tty_msg { u8 version; /* Message version */ u8 type; /* Message type */ #define MSG_MAX_DATALEN (~(u16)0) u16 datalen; /* Payload length */ u8 data[]; /* Payload buffer */ } __attribute__((packed)); enum iucv_state_t { IUCV_DISCONN = 0, IUCV_CONNECTED = 1, IUCV_SEVERED = 2, }; enum tty_state_t { TTY_CLOSED = 0, TTY_OPENED = 1, }; struct hvc_iucv_private { struct hvc_struct *hvc; /* HVC console struct reference */ u8 srv_name[8]; /* IUCV service name (ebcdic) */ enum iucv_state_t iucv_state; /* IUCV connection status */ enum tty_state_t tty_state; /* TTY status */ struct iucv_path *path; /* IUCV path pointer */ spinlock_t lock; /* hvc_iucv_private lock */ struct list_head tty_outqueue; /* outgoing IUCV messages */ struct list_head tty_inqueue; /* incoming IUCV messages */ }; struct iucv_tty_buffer { struct list_head list; /* list pointer */ struct iucv_message msg; /* store an incoming IUCV message */ size_t offset; /* data buffer offset */ struct iucv_tty_msg *mbuf; /* buffer to store input/output data */ }; /* IUCV callback handler */ static int hvc_iucv_path_pending(struct iucv_path *, u8[8], u8[16]); static void hvc_iucv_path_severed(struct iucv_path *, u8[16]); static void hvc_iucv_msg_pending(struct iucv_path *, struct iucv_message *); static void hvc_iucv_msg_complete(struct iucv_path *, struct iucv_message *); /* Kernel module parameters */ static unsigned long hvc_iucv_devices; /* Array of allocated hvc iucv tty lines... */ static struct hvc_iucv_private *hvc_iucv_table[MAX_HVC_IUCV_LINES]; /* Kmem cache and mempool for iucv_tty_buffer elements */ static struct kmem_cache *hvc_iucv_buffer_cache; static mempool_t *hvc_iucv_mempool; /* IUCV handler callback functions */ static struct iucv_handler hvc_iucv_handler = { .path_pending = hvc_iucv_path_pending, .path_severed = hvc_iucv_path_severed, .message_complete = hvc_iucv_msg_complete, .message_pending = hvc_iucv_msg_pending, }; /** * hvc_iucv_get_private() - Return a struct hvc_iucv_private instance. * @num: The HVC virtual terminal number (vtermno) * * This function returns the struct hvc_iucv_private instance that corresponds * to the HVC virtual terminal number specified as parameter @num. */ struct hvc_iucv_private *hvc_iucv_get_private(uint32_t num) { if ((num < HVC_IUCV_MAGIC) || (num - HVC_IUCV_MAGIC > hvc_iucv_devices)) return NULL; return hvc_iucv_table[num - HVC_IUCV_MAGIC]; } /** * alloc_tty_buffer() - Returns a new struct iucv_tty_buffer element. * @size: Size of the internal buffer used to store data. * @flags: Memory allocation flags passed to mempool. * * This function allocates a new struct iucv_tty_buffer element and, optionally, * allocates an internal data buffer with the specified size @size. * Note: The total message size arises from the internal buffer size and the * members of the iucv_tty_msg structure. * * The function returns NULL if memory allocation has failed. */ static struct iucv_tty_buffer *alloc_tty_buffer(size_t size, gfp_t flags) { struct iucv_tty_buffer *bufp; bufp = mempool_alloc(hvc_iucv_mempool, flags); if (!bufp) return NULL; memset(bufp, 0, sizeof(struct iucv_tty_buffer)); if (size > 0) { bufp->msg.length = MSG_SIZE(size); bufp->mbuf = kmalloc(bufp->msg.length, flags); if (!bufp->mbuf) { mempool_free(bufp, hvc_iucv_mempool); return NULL; } bufp->mbuf->version = MSG_VERSION; bufp->mbuf->type = MSG_TYPE_DATA; bufp->mbuf->datalen = (u16) size; } return bufp; } /** * destroy_tty_buffer() - destroy struct iucv_tty_buffer element. * @bufp: Pointer to a struct iucv_tty_buffer element, SHALL NOT be NULL. * * The destroy_tty_buffer() function frees the internal data buffer and returns * the struct iucv_tty_buffer element back to the mempool for freeing. */ static void destroy_tty_buffer(struct iucv_tty_buffer *bufp) { kfree(bufp->mbuf); mempool_free(bufp, hvc_iucv_mempool); } /** * destroy_tty_buffer_list() - call destroy_tty_buffer() for each list element. * @list: List head pointer to a list containing struct iucv_tty_buffer * elements. * * Calls destroy_tty_buffer() for each struct iucv_tty_buffer element in the * list @list. */ static void destroy_tty_buffer_list(struct list_head *list) { struct iucv_tty_buffer *ent, *next; list_for_each_entry_safe(ent, next, list, list) { list_del(&ent->list); destroy_tty_buffer(ent); } } /** * hvc_iucv_write() - Receive IUCV message write data to HVC console buffer. * @priv: Pointer to hvc_iucv_private structure. * @buf: HVC console buffer for writing received terminal data. * @count: HVC console buffer size. * @has_more_data: Pointer to an int variable. * * The function picks up pending messages from the input queue and receives * the message data that is then written to the specified buffer @buf. * If the buffer size @count is less than the data message size, then the * message is kept on the input queue and @has_more_data is set to 1. * If the message data has been entirely written, the message is removed from * the input queue. * * The function returns the number of bytes written to the terminal, zero if * there are no pending data messages available or if there is no established * IUCV path. * If the IUCV path has been severed, then -EPIPE is returned to cause a * hang up (that is issued by the HVC console layer). */ static int hvc_iucv_write(struct hvc_iucv_private *priv, char *buf, int count, int *has_more_data) { struct iucv_tty_buffer *rb; int written; int rc; /* Immediately return if there is no IUCV connection */ if (priv->iucv_state == IUCV_DISCONN) return 0; /* If the IUCV path has been severed, return -EPIPE to inform the * hvc console layer to hang up the tty device. */ if (priv->iucv_state == IUCV_SEVERED) return -EPIPE; /* check if there are pending messages */ if (list_empty(&priv->tty_inqueue)) return 0; /* receive a iucv message and flip data to the tty (ldisc) */ rb = list_first_entry(&priv->tty_inqueue, struct iucv_tty_buffer, list); written = 0; if (!rb->mbuf) { /* message not yet received ... */ /* allocate mem to store msg data; if no memory is available * then leave the buffer on the list and re-try later */ rb->mbuf = kmalloc(rb->msg.length, GFP_ATOMIC); if (!rb->mbuf) return -ENOMEM; rc = __iucv_message_receive(priv->path, &rb->msg, 0, rb->mbuf, rb->msg.length, NULL); switch (rc) { case 0: /* Successful */ break; case 2: /* No message found */ case 9: /* Message purged */ break; default: written = -EIO; } /* remove buffer if an error has occured or received data * is not correct */ if (rc || (rb->mbuf->version != MSG_VERSION) || (rb->msg.length != MSG_SIZE(rb->mbuf->datalen))) goto out_remove_buffer; } switch (rb->mbuf->type) { case MSG_TYPE_DATA: written = min_t(int, rb->mbuf->datalen - rb->offset, count); memcpy(buf, rb->mbuf->data + rb->offset, written); if (written < (rb->mbuf->datalen - rb->offset)) { rb->offset += written; *has_more_data = 1; goto out_written; } break; case MSG_TYPE_WINSIZE: if (rb->mbuf->datalen != sizeof(struct winsize)) break; hvc_resize(priv->hvc, *((struct winsize *)rb->mbuf->data)); break; case MSG_TYPE_ERROR: /* ignored ... */ case MSG_TYPE_TERMENV: /* ignored ... */ case MSG_TYPE_TERMIOS: /* ignored ... */ break; } out_remove_buffer: list_del(&rb->list); destroy_tty_buffer(rb); *has_more_data = !list_empty(&priv->tty_inqueue); out_written: return written; } /** * hvc_iucv_get_chars() - HVC get_chars operation. * @vtermno: HVC virtual terminal number. * @buf: Pointer to a buffer to store data * @count: Size of buffer available for writing * * The hvc_console thread calls this method to read characters from * the terminal backend. If an IUCV communication path has been established, * pending IUCV messages are received and data is copied into buffer @buf * up to @count bytes. * * Locking: The routine gets called under an irqsave() spinlock; and * the routine locks the struct hvc_iucv_private->lock to call * helper functions. */ static int hvc_iucv_get_chars(uint32_t vtermno, char *buf, int count) { struct hvc_iucv_private *priv = hvc_iucv_get_private(vtermno); int written; int has_more_data; if (count <= 0) return 0; if (!priv) return -ENODEV; spin_lock(&priv->lock); has_more_data = 0; written = hvc_iucv_write(priv, buf, count, &has_more_data); spin_unlock(&priv->lock); /* if there are still messages on the queue... schedule another run */ if (has_more_data) hvc_kick(); return written; } /** * hvc_iucv_send() - Send an IUCV message containing terminal data. * @priv: Pointer to struct hvc_iucv_private instance. * @buf: Buffer containing data to send. * @size: Size of buffer and amount of data to send. * * If an IUCV communication path is established, the function copies the buffer * data to a newly allocated struct iucv_tty_buffer element, sends the data and * puts the element to the outqueue. * * If there is no IUCV communication path established, the function returns 0. * If an existing IUCV communicaton path has been severed, the function returns * -EPIPE (can be passed to HVC layer to cause a tty hangup). */ static int hvc_iucv_send(struct hvc_iucv_private *priv, const char *buf, int count) { struct iucv_tty_buffer *sb; int rc; u16 len; if (priv->iucv_state == IUCV_SEVERED) return -EPIPE; if (priv->iucv_state == IUCV_DISCONN) return 0; len = min_t(u16, MSG_MAX_DATALEN, count); /* allocate internal buffer to store msg data and also compute total * message length */ sb = alloc_tty_buffer(len, GFP_ATOMIC); if (!sb) return -ENOMEM; sb->mbuf->datalen = len; memcpy(sb->mbuf->data, buf, len); list_add_tail(&sb->list, &priv->tty_outqueue); rc = __iucv_message_send(priv->path, &sb->msg, 0, 0, (void *) sb->mbuf, sb->msg.length); if (rc) { list_del(&sb->list); destroy_tty_buffer(sb); len = 0; } return len; } /** * hvc_iucv_put_chars() - HVC put_chars operation. * @vtermno: HVC virtual terminal number. * @buf: Pointer to an buffer to read data from * @count: Size of buffer available for reading * * The hvc_console thread calls this method to write characters from * to the terminal backend. * The function calls hvc_iucv_send() under the lock of the * struct hvc_iucv_private instance that corresponds to the tty @vtermno. * * Locking: The method gets called under an irqsave() spinlock; and * locks struct hvc_iucv_private->lock. */ static int hvc_iucv_put_chars(uint32_t vtermno, const char *buf, int count) { struct hvc_iucv_private *priv = hvc_iucv_get_private(vtermno); int sent; if (count <= 0) return 0; if (!priv) return -ENODEV; spin_lock(&priv->lock); sent = hvc_iucv_send(priv, buf, count); spin_unlock(&priv->lock); return sent; } /** * hvc_iucv_notifier_add() - HVC notifier for opening a TTY for the first time. * @hp: Pointer to the HVC device (struct hvc_struct) * @id: Additional data (originally passed to hvc_alloc): the index of an struct * hvc_iucv_private instance. * * The function sets the tty state to TTY_OPEN for the struct hvc_iucv_private * instance that is derived from @id. Always returns 0. * * Locking: struct hvc_iucv_private->lock, spin_lock_bh */ static int hvc_iucv_notifier_add(struct hvc_struct *hp, int id) { struct hvc_iucv_private *priv; priv = hvc_iucv_get_private(id); if (!priv) return 0; spin_lock_bh(&priv->lock); priv->tty_state = TTY_OPENED; spin_unlock_bh(&priv->lock); return 0; } /** * hvc_iucv_cleanup() - Clean up function if the tty portion is finally closed. * @priv: Pointer to the struct hvc_iucv_private instance. * * The functions severs the established IUCV communication path (if any), and * destroy struct iucv_tty_buffer elements from the in- and outqueue. Finally, * the functions resets the states to TTY_CLOSED and IUCV_DISCONN. */ static void hvc_iucv_cleanup(struct hvc_iucv_private *priv) { destroy_tty_buffer_list(&priv->tty_outqueue); destroy_tty_buffer_list(&priv->tty_inqueue); priv->tty_state = TTY_CLOSED; priv->iucv_state = IUCV_DISCONN; } /** * hvc_iucv_notifier_hangup() - HVC notifier for tty hangups. * @hp: Pointer to the HVC device (struct hvc_struct) * @id: Additional data (originally passed to hvc_alloc): the index of an struct * hvc_iucv_private instance. * * This routine notifies the HVC backend that a tty hangup (carrier loss, * virtual or otherwise) has occured. * * The HVC backend for z/VM IUCV ignores virtual hangups (vhangup()), to keep * an existing IUCV communication path established. * (Background: vhangup() is called from user space (by getty or login) to * disable writing to the tty by other applications). * * If the tty has been opened (e.g. getty) and an established IUCV path has been * severed (we caused the tty hangup in that case), then the functions invokes * hvc_iucv_cleanup() to clean up. * * Locking: struct hvc_iucv_private->lock */ static void hvc_iucv_notifier_hangup(struct hvc_struct *hp, int id) { struct hvc_iucv_private *priv; priv = hvc_iucv_get_private(id); if (!priv) return; spin_lock_bh(&priv->lock); /* NOTE: If the hangup was scheduled by ourself (from the iucv * path_servered callback [IUCV_SEVERED]), then we have to * finally clean up the tty backend structure and set state to * TTY_CLOSED. * * If the tty was hung up otherwise (e.g. vhangup()), then we * ignore this hangup and keep an established IUCV path open... * (...the reason is that we are not able to connect back to the * client if we disconnect on hang up) */ priv->tty_state = TTY_CLOSED; if (priv->iucv_state == IUCV_SEVERED) hvc_iucv_cleanup(priv); spin_unlock_bh(&priv->lock); } /** * hvc_iucv_notifier_del() - HVC notifier for closing a TTY for the last time. * @hp: Pointer to the HVC device (struct hvc_struct) * @id: Additional data (originally passed to hvc_alloc): * the index of an struct hvc_iucv_private instance. * * This routine notifies the HVC backend that the last tty device file * descriptor has been closed. * The function calls hvc_iucv_cleanup() to clean up the struct hvc_iucv_private * instance. * * Locking: struct hvc_iucv_private->lock */ static void hvc_iucv_notifier_del(struct hvc_struct *hp, int id) { struct hvc_iucv_private *priv; struct iucv_path *path; priv = hvc_iucv_get_private(id); if (!priv) return; spin_lock_bh(&priv->lock); path = priv->path; /* save reference to IUCV path */ priv->path = NULL; hvc_iucv_cleanup(priv); spin_unlock_bh(&priv->lock); /* sever IUCV path outside of priv->lock due to lock ordering of: * priv->lock <--> iucv_table_lock */ if (path) { iucv_path_sever(path, NULL); iucv_path_free(path); } } /** * hvc_iucv_path_pending() - IUCV handler to process a connection request. * @path: Pending path (struct iucv_path) * @ipvmid: Originator z/VM system identifier * @ipuser: User specified data for this path * (AF_IUCV: port/service name and originator port) * * The function uses the @ipuser data to check to determine if the pending * path belongs to a terminal managed by this HVC backend. * If the check is successful, then an additional check is done to ensure * that a terminal cannot be accessed multiple times (only one connection * to a terminal is allowed). In that particular case, the pending path is * severed. If it is the first connection, the pending path is accepted and * associated to the struct hvc_iucv_private. The iucv state is updated to * reflect that a communication path has been established. * * Returns 0 if the path belongs to a terminal managed by the this HVC backend; * otherwise returns -ENODEV in order to dispatch this path to other handlers. * * Locking: struct hvc_iucv_private->lock */ static int hvc_iucv_path_pending(struct iucv_path *path, u8 ipvmid[8], u8 ipuser[16]) { struct hvc_iucv_private *priv; u8 nuser_data[16]; int i, rc; priv = NULL; for (i = 0; i < hvc_iucv_devices; i++) if (hvc_iucv_table[i] && (0 == memcmp(hvc_iucv_table[i]->srv_name, ipuser, 8))) { priv = hvc_iucv_table[i]; break; } if (!priv) return -ENODEV; spin_lock(&priv->lock); /* If the terminal is already connected or being severed, then sever * this path to enforce that there is only ONE established communication * path per terminal. */ if (priv->iucv_state != IUCV_DISCONN) { iucv_path_sever(path, ipuser); iucv_path_free(path); goto out_path_handled; } /* accept path */ memcpy(nuser_data, ipuser + 8, 8); /* remote service (for af_iucv) */ memcpy(nuser_data + 8, ipuser, 8); /* local service (for af_iucv) */ path->msglim = 0xffff; /* IUCV MSGLIMIT */ path->flags &= ~IUCV_IPRMDATA; /* TODO: use IUCV_IPRMDATA */ rc = iucv_path_accept(path, &hvc_iucv_handler, nuser_data, priv); if (rc) { iucv_path_sever(path, ipuser); iucv_path_free(path); goto out_path_handled; } priv->path = path; priv->iucv_state = IUCV_CONNECTED; out_path_handled: spin_unlock(&priv->lock); return 0; } /** * hvc_iucv_path_severed() - IUCV handler to process a path sever. * @path: Pending path (struct iucv_path) * @ipuser: User specified data for this path * (AF_IUCV: port/service name and originator port) * * The function also severs the path (as required by the IUCV protocol) and * sets the iucv state to IUCV_SEVERED for the associated struct * hvc_iucv_private instance. Later, the IUCV_SEVERED state triggers a tty * hangup (hvc_iucv_get_chars() / hvc_iucv_write()). * * If tty portion of the HVC is closed then clean up the outqueue in addition. * * Locking: struct hvc_iucv_private->lock */ static void hvc_iucv_path_severed(struct iucv_path *path, u8 ipuser[16]) { struct hvc_iucv_private *priv = path->private; spin_lock(&priv->lock); priv->iucv_state = IUCV_SEVERED; /* NOTE: If the tty has not yet been opened by a getty program * (e.g. to see console messages), then cleanup the * hvc_iucv_private structure to allow re-connects. * * If the tty has been opened, the get_chars() callback returns * -EPIPE to signal the hvc console layer to hang up the tty. */ priv->path = NULL; if (priv->tty_state == TTY_CLOSED) hvc_iucv_cleanup(priv); spin_unlock(&priv->lock); /* finally sever path (outside of priv->lock due to lock ordering) */ iucv_path_sever(path, ipuser); iucv_path_free(path); } /** * hvc_iucv_msg_pending() - IUCV handler to process an incoming IUCV message. * @path: Pending path (struct iucv_path) * @msg: Pointer to the IUCV message * * The function stores an incoming message on the input queue for later * processing (by hvc_iucv_get_chars() / hvc_iucv_write()). * However, if the tty has not yet been opened, the message is rejected. * * Locking: struct hvc_iucv_private->lock */ static void hvc_iucv_msg_pending(struct iucv_path *path, struct iucv_message *msg) { struct hvc_iucv_private *priv = path->private; struct iucv_tty_buffer *rb; spin_lock(&priv->lock); /* reject messages if tty has not yet been opened */ if (priv->tty_state == TTY_CLOSED) { iucv_message_reject(path, msg); goto unlock_return; } /* allocate buffer an empty buffer element */ rb = alloc_tty_buffer(0, GFP_ATOMIC); if (!rb) { iucv_message_reject(path, msg); goto unlock_return; /* -ENOMEM */ } rb->msg = *msg; list_add_tail(&rb->list, &priv->tty_inqueue); hvc_kick(); /* wakup hvc console thread */ unlock_return: spin_unlock(&priv->lock); } /** * hvc_iucv_msg_complete() - IUCV handler to process message completion * @path: Pending path (struct iucv_path) * @msg: Pointer to the IUCV message * * The function is called upon completion of message delivery and the * message is removed from the outqueue. Additional delivery information * can be found in msg->audit: rejected messages (0x040000 (IPADRJCT)) and * purged messages (0x010000 (IPADPGNR)). * * Locking: struct hvc_iucv_private->lock */ static void hvc_iucv_msg_complete(struct iucv_path *path, struct iucv_message *msg) { struct hvc_iucv_private *priv = path->private; struct iucv_tty_buffer *ent, *next; LIST_HEAD(list_remove); spin_lock(&priv->lock); list_for_each_entry_safe(ent, next, &priv->tty_outqueue, list) if (ent->msg.id == msg->id) { list_move(&ent->list, &list_remove); break; } spin_unlock(&priv->lock); destroy_tty_buffer_list(&list_remove); } /* HVC operations */ static struct hv_ops hvc_iucv_ops = { .get_chars = hvc_iucv_get_chars, .put_chars = hvc_iucv_put_chars, .notifier_add = hvc_iucv_notifier_add, .notifier_del = hvc_iucv_notifier_del, .notifier_hangup = hvc_iucv_notifier_hangup, }; /** * hvc_iucv_alloc() - Allocates a new struct hvc_iucv_private instance * @id: hvc_iucv_table index * * This function allocates a new hvc_iucv_private struct and put the * instance into hvc_iucv_table at index @id. * Returns 0 on success; otherwise non-zero. */ static int __init hvc_iucv_alloc(int id) { struct hvc_iucv_private *priv; char name[9]; int rc; priv = kzalloc(sizeof(struct hvc_iucv_private), GFP_KERNEL); if (!priv) return -ENOMEM; spin_lock_init(&priv->lock); INIT_LIST_HEAD(&priv->tty_outqueue); INIT_LIST_HEAD(&priv->tty_inqueue); /* Finally allocate hvc */ priv->hvc = hvc_alloc(HVC_IUCV_MAGIC + id, HVC_IUCV_MAGIC + id, &hvc_iucv_ops, PAGE_SIZE); if (IS_ERR(priv->hvc)) { rc = PTR_ERR(priv->hvc); kfree(priv); return rc; } /* setup iucv related information */ snprintf(name, 9, "ihvc%-4d", id); memcpy(priv->srv_name, name, 8); ASCEBC(priv->srv_name, 8); hvc_iucv_table[id] = priv; return 0; } /** * hvc_iucv_init() - Initialization of HVC backend for z/VM IUCV */ static int __init hvc_iucv_init(void) { int rc, i; if (!MACHINE_IS_VM) { pr_warning("The z/VM IUCV Hypervisor console cannot be " "used without z/VM.\n"); return -ENODEV; } if (!hvc_iucv_devices) return -ENODEV; if (hvc_iucv_devices > MAX_HVC_IUCV_LINES) return -EINVAL; hvc_iucv_buffer_cache = kmem_cache_create(KMSG_COMPONENT, sizeof(struct iucv_tty_buffer), 0, 0, NULL); if (!hvc_iucv_buffer_cache) { pr_err("Not enough memory for driver initialization " "(rs=%d).\n", 1); return -ENOMEM; } hvc_iucv_mempool = mempool_create_slab_pool(MEMPOOL_MIN_NR, hvc_iucv_buffer_cache); if (!hvc_iucv_mempool) { pr_err("Not enough memory for driver initialization " "(rs=%d).\n", 2); kmem_cache_destroy(hvc_iucv_buffer_cache); return -ENOMEM; } /* allocate hvc_iucv_private structs */ for (i = 0; i < hvc_iucv_devices; i++) { rc = hvc_iucv_alloc(i); if (rc) { pr_err("Could not create new z/VM IUCV HVC backend " "rc=%d.\n", rc); goto out_error_hvc; } } /* register IUCV callback handler */ rc = iucv_register(&hvc_iucv_handler, 0); if (rc) { pr_err("Could not register iucv handler (rc=%d).\n", rc); goto out_error_iucv; } return 0; out_error_iucv: iucv_unregister(&hvc_iucv_handler, 0); out_error_hvc: for (i = 0; i < hvc_iucv_devices; i++) if (hvc_iucv_table[i]) { if (hvc_iucv_table[i]->hvc) hvc_remove(hvc_iucv_table[i]->hvc); kfree(hvc_iucv_table[i]); } mempool_destroy(hvc_iucv_mempool); kmem_cache_destroy(hvc_iucv_buffer_cache); return rc; } /** * hvc_iucv_console_init() - Early console initialization */ static int __init hvc_iucv_console_init(void) { if (!MACHINE_IS_VM || !hvc_iucv_devices) return -ENODEV; return hvc_instantiate(HVC_IUCV_MAGIC, 0, &hvc_iucv_ops); } /** * hvc_iucv_config() - Parsing of hvc_iucv= kernel command line parameter * @val: Parameter value (numeric) */ static int __init hvc_iucv_config(char *val) { return strict_strtoul(val, 10, &hvc_iucv_devices); } module_init(hvc_iucv_init); console_initcall(hvc_iucv_console_init); __setup("hvc_iucv=", hvc_iucv_config); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("HVC back-end for z/VM IUCV."); MODULE_AUTHOR("Hendrik Brueckner ");