iucv.c

linux 内核源代码

		if (!iucv_param[cpu])
			return NOTIFY_BAD;
		break;
	case CPU_UP_CANCELED:
	case CPU_UP_CANCELED_FROZEN:
	case CPU_DEAD:
	case CPU_DEAD_FROZEN:
		kfree(iucv_param[cpu]);
		iucv_param[cpu] = NULL;
		kfree(iucv_irq_data[cpu]);
		iucv_irq_data[cpu] = NULL;
		break;
	case CPU_ONLINE:
	case CPU_ONLINE_FROZEN:
	case CPU_DOWN_FAILED:
	case CPU_DOWN_FAILED_FROZEN:
		smp_call_function_single(cpu, iucv_declare_cpu, NULL, 0, 1);
		break;
	case CPU_DOWN_PREPARE:
	case CPU_DOWN_PREPARE_FROZEN:
		cpumask = iucv_buffer_cpumask;
		cpu_clear(cpu, cpumask);
		if (cpus_empty(cpumask))
			/* Can't offline last IUCV enabled cpu. */
			return NOTIFY_BAD;
		smp_call_function_single(cpu, iucv_retrieve_cpu, NULL, 0, 1);
		if (cpus_empty(iucv_irq_cpumask))
			smp_call_function_single(first_cpu(iucv_buffer_cpumask),
						 iucv_allow_cpu, NULL, 0, 1);
		break;
	}
	return NOTIFY_OK;
}

static struct notifier_block __cpuinitdata iucv_cpu_notifier = {
	.notifier_call = iucv_cpu_notify,
};

/**
 * iucv_sever_pathid
 * @pathid: path identification number.
 * @userdata: 16-bytes of user data.
 *
 * Sever an iucv path to free up the pathid. Used internally.
 */
static int iucv_sever_pathid(u16 pathid, u8 userdata[16])
{
	union iucv_param *parm;

	parm = iucv_param[smp_processor_id()];
	memset(parm, 0, sizeof(union iucv_param));
	if (userdata)
		memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
	parm->ctrl.ippathid = pathid;
	return iucv_call_b2f0(IUCV_SEVER, parm);
}

#ifdef CONFIG_SMP
/**
 * __iucv_cleanup_queue
 * @dummy: unused dummy argument
 *
 * Nop function called via smp_call_function to force work items from
 * pending external iucv interrupts to the work queue.
 */
static void __iucv_cleanup_queue(void *dummy)
{
}
#endif

/**
 * iucv_cleanup_queue
 *
 * Function called after a path has been severed to find all remaining
 * work items for the now stale pathid. The caller needs to hold the
 * iucv_table_lock.
 */
static void iucv_cleanup_queue(void)
{
	struct iucv_irq_list *p, *n;

	/*
	 * When a path is severed, the pathid can be reused immediatly
	 * on a iucv connect or a connection pending interrupt. Remove
	 * all entries from the task queue that refer to a stale pathid
	 * (iucv_path_table[ix] == NULL). Only then do the iucv connect
	 * or deliver the connection pending interrupt. To get all the
	 * pending interrupts force them to the work queue by calling
	 * an empty function on all cpus.
	 */
	smp_call_function(__iucv_cleanup_queue, NULL, 0, 1);
	spin_lock_irq(&iucv_queue_lock);
	list_for_each_entry_safe(p, n, &iucv_task_queue, list) {
		/* Remove stale work items from the task queue. */
		if (iucv_path_table[p->data.ippathid] == NULL) {
			list_del(&p->list);
			kfree(p);
		}
	}
	spin_unlock_irq(&iucv_queue_lock);
}

/**
 * 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)
{
	int rc;

	if (!iucv_available)
		return -ENOSYS;
	mutex_lock(&iucv_register_mutex);
	if (!smp)
		iucv_nonsmp_handler++;
	if (list_empty(&iucv_handler_list)) {
		rc = iucv_enable();
		if (rc)
			goto out_mutex;
	} else if (!smp && iucv_nonsmp_handler == 1)
		iucv_setmask_up();
	INIT_LIST_HEAD(&handler->paths);

	spin_lock_irq(&iucv_table_lock);
	list_add_tail(&handler->list, &iucv_handler_list);
	spin_unlock_irq(&iucv_table_lock);
	rc = 0;
out_mutex:
	mutex_unlock(&iucv_register_mutex);
	return rc;
}
EXPORT_SYMBOL(iucv_register);

/**
 * 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 *handler, int smp)
{
	struct iucv_path *p, *n;

	mutex_lock(&iucv_register_mutex);
	spin_lock_bh(&iucv_table_lock);
	/* Remove handler from the iucv_handler_list. */
	list_del_init(&handler->list);
	/* Sever all pathids still refering to the handler. */
	list_for_each_entry_safe(p, n, &handler->paths, list) {
		iucv_sever_pathid(p->pathid, NULL);
		iucv_path_table[p->pathid] = NULL;
		list_del(&p->list);
		iucv_path_free(p);
	}
	spin_unlock_bh(&iucv_table_lock);
	if (!smp)
		iucv_nonsmp_handler--;
	if (list_empty(&iucv_handler_list))
		iucv_disable();
	else if (!smp && iucv_nonsmp_handler == 0)
		iucv_setmask_mp();
	mutex_unlock(&iucv_register_mutex);
}
EXPORT_SYMBOL(iucv_unregister);

/**
 * 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[16], void *private)
{
	union iucv_param *parm;
	int rc;

	local_bh_disable();
	/* Prepare parameter block. */
	parm = iucv_param[smp_processor_id()];
	memset(parm, 0, sizeof(union iucv_param));
	parm->ctrl.ippathid = path->pathid;
	parm->ctrl.ipmsglim = path->msglim;
	if (userdata)
		memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
	parm->ctrl.ipflags1 = path->flags;

	rc = iucv_call_b2f0(IUCV_ACCEPT, parm);
	if (!rc) {
		path->private = private;
		path->msglim = parm->ctrl.ipmsglim;
		path->flags = parm->ctrl.ipflags1;
	}
	local_bh_enable();
	return rc;
}
EXPORT_SYMBOL(iucv_path_accept);

/**
 * 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[8], u8 system[8], u8 userdata[16],
		      void *private)
{
	union iucv_param *parm;
	int rc;

	BUG_ON(in_atomic());
	spin_lock_bh(&iucv_table_lock);
	iucv_cleanup_queue();
	parm = iucv_param[smp_processor_id()];
	memset(parm, 0, sizeof(union iucv_param));
	parm->ctrl.ipmsglim = path->msglim;
	parm->ctrl.ipflags1 = path->flags;
	if (userid) {
		memcpy(parm->ctrl.ipvmid, userid, sizeof(parm->ctrl.ipvmid));
		ASCEBC(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
		EBC_TOUPPER(parm->ctrl.ipvmid, sizeof(parm->ctrl.ipvmid));
	}
	if (system) {
		memcpy(parm->ctrl.iptarget, system,
		       sizeof(parm->ctrl.iptarget));
		ASCEBC(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
		EBC_TOUPPER(parm->ctrl.iptarget, sizeof(parm->ctrl.iptarget));
	}
	if (userdata)
		memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));

	rc = iucv_call_b2f0(IUCV_CONNECT, parm);
	if (!rc) {
		if (parm->ctrl.ippathid < iucv_max_pathid) {
			path->pathid = parm->ctrl.ippathid;
			path->msglim = parm->ctrl.ipmsglim;
			path->flags = parm->ctrl.ipflags1;
			path->handler = handler;
			path->private = private;
			list_add_tail(&path->list, &handler->paths);
			iucv_path_table[path->pathid] = path;
		} else {
			iucv_sever_pathid(parm->ctrl.ippathid,
					  iucv_error_pathid);
			rc = -EIO;
		}
	}
	spin_unlock_bh(&iucv_table_lock);
	return rc;
}
EXPORT_SYMBOL(iucv_path_connect);

/**
 * 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[16])
{
	union iucv_param *parm;
	int rc;

	local_bh_disable();
	parm = iucv_param[smp_processor_id()];
	memset(parm, 0, sizeof(union iucv_param));
	if (userdata)
		memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
	parm->ctrl.ippathid = path->pathid;
	rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
	local_bh_enable();
	return rc;
}
EXPORT_SYMBOL(iucv_path_quiesce);

/**
 * 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[16])
{
	union iucv_param *parm;
	int rc;

	local_bh_disable();
	parm = iucv_param[smp_processor_id()];
	memset(parm, 0, sizeof(union iucv_param));
	if (userdata)
		memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
	parm->ctrl.ippathid = path->pathid;
	rc = iucv_call_b2f0(IUCV_RESUME, parm);
	local_bh_enable();
	return rc;
}

/**
 * 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[16])
{
	int rc;

	preempt_disable();
	if (iucv_active_cpu != smp_processor_id())
		spin_lock_bh(&iucv_table_lock);
	rc = iucv_sever_pathid(path->pathid, userdata);
	if (!rc) {
		iucv_path_table[path->pathid] = NULL;
		list_del_init(&path->list);
	}
	if (iucv_active_cpu != smp_processor_id())
		spin_unlock_bh(&iucv_table_lock);
	preempt_enable();
	return rc;
}
EXPORT_SYMBOL(iucv_path_sever);

/**
 * 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)
{
	union iucv_param *parm;
	int rc;

	local_bh_disable();
	parm = iucv_param[smp_processor_id()];
	memset(parm, 0, sizeof(union iucv_param));
	parm->purge.ippathid = path->pathid;
	parm->purge.ipmsgid = msg->id;
	parm->purge.ipsrccls = srccls;
	parm->purge.ipflags1 = IUCV_IPSRCCLS | IUCV_IPFGMID | IUCV_IPFGPID;
	rc = iucv_call_b2f0(IUCV_PURGE, parm);
	if (!rc) {
		msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
		msg->tag = parm->purge.ipmsgtag;
	}
	local_bh_enable();
	return rc;
}
EXPORT_SYMBOL(iucv_message_purge);

/**
 * iucv_message_receive
 * @path: address of iucv path structure
 * @msg: address of iucv msg structure
 * @flags: 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.
 *
 * 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)
{
	union iucv_param *parm;
	struct iucv_array *array;
	u8 *rmmsg;
	size_t copy;
	int rc;

	if (msg->flags & IUCV_IPRMDATA) {
		/*
		 * Message is 8 bytes long and has been stored to the
		 * message descriptor itself.
		 */
		rc = (size < 8) ? 5 : 0;
		if (residual)
			*residual = abs(size - 8);
		rmmsg = msg->rmmsg;
		if (flags & IUCV_IPBUFLST) {
			/* Copy to struct iucv_array. */
			size = (size < 8) ? size : 8;
			for (array = buffer; size > 0; array++) {
				copy = min_t(size_t, size, array->length);
				memcpy((u8 *)(addr_t) array->address,
				       rmmsg, copy);
				rmmsg += copy;
				size -= copy;
			}
		} else {
			/* Copy to direct buffer. */
			memcpy(buffer, rmmsg, min_t(size_t, size, 8));
		}
		return 0;
	}

	local_bh_disable();
	parm = iucv_param[smp_processor_id()];
	memset(parm, 0, sizeof(union iucv_param));
	parm->db.ipbfadr1 = (u32)(addr_t) buffer;
	parm->db.ipbfln1f = (u32) size;
	parm->db.ipmsgid = msg->id;
	parm->db.ippathid = path->pathid;
	parm->db.iptrgcls = msg->class;
	parm->db.ipflags1 = (flags | IUCV_IPFGPID |
			     IUCV_IPFGMID | IUCV_IPTRGCLS);
	rc = iucv_call_b2f0(IUCV_RECEIVE, parm);
	if (!rc || rc == 5) {
		msg->flags = parm->db.ipflags1;
		if (residual)
			*residual = parm->db.ipbfln1f;
	}
	local_bh_enable();
	return rc;
}
EXPORT_SYMBOL(iucv_message_receive);

/**
 * 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)
{
	union iucv_param *parm;
	int rc;

	local_bh_disable();
	parm = iucv_param[smp_processor_id()];
	memset(parm, 0, sizeof(union iucv_param));
	parm->db.ippathid = path->pathid;
	parm->db.ipmsgid = msg->id;
	parm->db.iptrgcls = msg->class;
	parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
	rc = iucv_call_b2f0(IUCV_REJECT, parm);
	local_bh_enable();
	return rc;
}
EXPORT_SYMBOL(iucv_message_reject);

/**
 * 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 reply 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)
{
	union iucv_param *parm;
	int rc;

	local_bh_disable();
	parm = iucv_param[smp_processor_id()];
	memset(parm, 0, sizeof(union iucv_param));
	if (flags & IUCV_IPRMDATA) {
		parm->dpl.ippathid = path->pathid;
		parm->dpl.ipflags1 = flags;
		parm->dpl.ipmsgid = msg->id;
		parm->dpl.iptrgcls = msg->class;
		memcpy(parm->dpl.iprmmsg, reply, min_t(size_t, size, 8));
	} else {
		parm->db.ipbfadr1 = (u32)(addr_t) reply;
		parm->db.ipbfln1f = (u32) size;
		parm->db.ippathid = path->pathid;
		parm->db.ipflags1 = flags;
		parm->db.ipmsgid = msg->id;
		parm->db.iptrgcls = msg->class;
	}
	rc = iucv_call_b2f0(IUCV_REPLY, parm);
	local_bh_enable();
	return rc;
}
EXPORT_SYMBOL(iucv_message_reply);

/**
 * 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 send 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.
 *
 * 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)
{
	union iucv_param *parm;
	int rc;

	local_bh_disable();
	parm = iucv_param[smp_processor_id()];
	memset(parm, 0, sizeof(union iucv_param));
	if (flags & IUCV_IPRMDATA) {
		/* Message of 8 bytes can be placed into the parameter list. */
		parm->dpl.ippathid = path->pathid;
		parm->dpl.ipflags1 = flags | IUCV_IPNORPY;
		parm->dpl.iptrgcls = msg->class;
		parm->dpl.ipsrccls = srccls;
		parm->dpl.ipmsgtag = msg->tag;
		memcpy(parm->dpl.iprmmsg, buffer, 8);
	} else {