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[S390] iucv: establish reboot notifier
To guarantee a proper cleanup, patch adds a reboot notifier to the iucv base code, which disables iucv interrupts, shuts down established iucv pathes, and removes iucv declarations for z/VM. Checks have to be added to the iucv-API functions, whether iucv-buffers removed at reboot time are still declared. Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Ursula Braun
Martin Schwidefsky
parent
62b7494209
commit
6c005961c1
1 changed files with 87 additions and 2 deletions
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@ -1,7 +1,8 @@
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/*
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* IUCV base infrastructure.
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*
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* Copyright 2001, 2006 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Copyright IBM Corp. 2001, 2009
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*
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* Author(s):
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* Original source:
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* Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
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@ -45,6 +46,7 @@
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/cpu.h>
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#include <linux/reboot.h>
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#include <net/iucv/iucv.h>
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#include <asm/atomic.h>
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#include <asm/ebcdic.h>
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@ -758,6 +760,28 @@ void iucv_unregister(struct iucv_handler *handler, int smp)
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}
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EXPORT_SYMBOL(iucv_unregister);
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static int iucv_reboot_event(struct notifier_block *this,
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unsigned long event, void *ptr)
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{
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int i, rc;
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get_online_cpus();
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on_each_cpu(iucv_block_cpu, NULL, 1);
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preempt_disable();
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for (i = 0; i < iucv_max_pathid; i++) {
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if (iucv_path_table[i])
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rc = iucv_sever_pathid(i, NULL);
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}
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preempt_enable();
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put_online_cpus();
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iucv_disable();
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return NOTIFY_DONE;
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}
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static struct notifier_block iucv_reboot_notifier = {
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.notifier_call = iucv_reboot_event,
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};
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/**
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* iucv_path_accept
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* @path: address of iucv path structure
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@ -777,6 +801,10 @@ int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
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int rc;
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local_bh_disable();
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if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
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rc = -EIO;
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goto out;
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}
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/* Prepare parameter block. */
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parm = iucv_param[smp_processor_id()];
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memset(parm, 0, sizeof(union iucv_param));
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@ -792,6 +820,7 @@ int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
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path->msglim = parm->ctrl.ipmsglim;
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path->flags = parm->ctrl.ipflags1;
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}
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out:
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local_bh_enable();
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return rc;
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}
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@ -821,6 +850,10 @@ int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
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spin_lock_bh(&iucv_table_lock);
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iucv_cleanup_queue();
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if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
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rc = -EIO;
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goto out;
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}
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parm = iucv_param[smp_processor_id()];
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memset(parm, 0, sizeof(union iucv_param));
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parm->ctrl.ipmsglim = path->msglim;
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@ -855,6 +888,7 @@ int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
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rc = -EIO;
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}
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}
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out:
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spin_unlock_bh(&iucv_table_lock);
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return rc;
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}
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@ -876,12 +910,17 @@ int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16])
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int rc;
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local_bh_disable();
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if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
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rc = -EIO;
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goto out;
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}
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parm = iucv_param[smp_processor_id()];
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memset(parm, 0, sizeof(union iucv_param));
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if (userdata)
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memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
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parm->ctrl.ippathid = path->pathid;
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rc = iucv_call_b2f0(IUCV_QUIESCE, parm);
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out:
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local_bh_enable();
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return rc;
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}
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@ -903,12 +942,17 @@ int iucv_path_resume(struct iucv_path *path, u8 userdata[16])
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int rc;
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local_bh_disable();
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if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
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rc = -EIO;
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goto out;
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}
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parm = iucv_param[smp_processor_id()];
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memset(parm, 0, sizeof(union iucv_param));
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if (userdata)
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memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
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parm->ctrl.ippathid = path->pathid;
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rc = iucv_call_b2f0(IUCV_RESUME, parm);
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out:
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local_bh_enable();
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return rc;
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}
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@ -927,6 +971,10 @@ int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
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int rc;
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preempt_disable();
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if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
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rc = -EIO;
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goto out;
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}
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if (iucv_active_cpu != smp_processor_id())
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spin_lock_bh(&iucv_table_lock);
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rc = iucv_sever_pathid(path->pathid, userdata);
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@ -934,6 +982,7 @@ int iucv_path_sever(struct iucv_path *path, u8 userdata[16])
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list_del_init(&path->list);
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if (iucv_active_cpu != smp_processor_id())
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spin_unlock_bh(&iucv_table_lock);
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out:
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preempt_enable();
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return rc;
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}
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@ -956,6 +1005,10 @@ int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
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int rc;
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local_bh_disable();
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if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
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rc = -EIO;
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goto out;
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}
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parm = iucv_param[smp_processor_id()];
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memset(parm, 0, sizeof(union iucv_param));
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parm->purge.ippathid = path->pathid;
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@ -967,6 +1020,7 @@ int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
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msg->audit = (*(u32 *) &parm->purge.ipaudit) >> 8;
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msg->tag = parm->purge.ipmsgtag;
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}
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out:
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local_bh_enable();
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return rc;
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}
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@ -1043,6 +1097,10 @@ int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
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if (msg->flags & IUCV_IPRMDATA)
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return iucv_message_receive_iprmdata(path, msg, flags,
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buffer, size, residual);
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if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
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rc = -EIO;
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goto out;
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}
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parm = iucv_param[smp_processor_id()];
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memset(parm, 0, sizeof(union iucv_param));
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parm->db.ipbfadr1 = (u32)(addr_t) buffer;
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@ -1058,6 +1116,7 @@ int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
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if (residual)
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*residual = parm->db.ipbfln1f;
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}
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out:
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return rc;
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}
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EXPORT_SYMBOL(__iucv_message_receive);
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@ -1111,6 +1170,10 @@ int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
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int rc;
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local_bh_disable();
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if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
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rc = -EIO;
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goto out;
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}
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parm = iucv_param[smp_processor_id()];
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memset(parm, 0, sizeof(union iucv_param));
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parm->db.ippathid = path->pathid;
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@ -1118,6 +1181,7 @@ int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg)
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parm->db.iptrgcls = msg->class;
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parm->db.ipflags1 = (IUCV_IPTRGCLS | IUCV_IPFGMID | IUCV_IPFGPID);
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rc = iucv_call_b2f0(IUCV_REJECT, parm);
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out:
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local_bh_enable();
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return rc;
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}
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@ -1145,6 +1209,10 @@ int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
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int rc;
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local_bh_disable();
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if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
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rc = -EIO;
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goto out;
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}
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parm = iucv_param[smp_processor_id()];
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memset(parm, 0, sizeof(union iucv_param));
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if (flags & IUCV_IPRMDATA) {
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@ -1162,6 +1230,7 @@ int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
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parm->db.iptrgcls = msg->class;
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}
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rc = iucv_call_b2f0(IUCV_REPLY, parm);
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out:
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local_bh_enable();
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return rc;
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}
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@ -1190,6 +1259,10 @@ int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
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union iucv_param *parm;
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int rc;
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if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
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rc = -EIO;
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goto out;
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}
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parm = iucv_param[smp_processor_id()];
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memset(parm, 0, sizeof(union iucv_param));
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if (flags & IUCV_IPRMDATA) {
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@ -1212,6 +1285,7 @@ int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
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rc = iucv_call_b2f0(IUCV_SEND, parm);
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if (!rc)
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msg->id = parm->db.ipmsgid;
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out:
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return rc;
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}
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EXPORT_SYMBOL(__iucv_message_send);
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@ -1272,6 +1346,10 @@ int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
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int rc;
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local_bh_disable();
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if (!cpu_isset(smp_processor_id(), iucv_buffer_cpumask)) {
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rc = -EIO;
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goto out;
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}
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parm = iucv_param[smp_processor_id()];
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memset(parm, 0, sizeof(union iucv_param));
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if (flags & IUCV_IPRMDATA) {
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@ -1297,6 +1375,7 @@ int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
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rc = iucv_call_b2f0(IUCV_SEND, parm);
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if (!rc)
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msg->id = parm->db.ipmsgid;
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out:
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local_bh_enable();
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return rc;
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}
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@ -1740,15 +1819,20 @@ static int __init iucv_init(void)
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rc = register_hotcpu_notifier(&iucv_cpu_notifier);
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if (rc)
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goto out_free;
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rc = register_reboot_notifier(&iucv_reboot_notifier);
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if (rc)
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goto out_cpu;
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ASCEBC(iucv_error_no_listener, 16);
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ASCEBC(iucv_error_no_memory, 16);
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ASCEBC(iucv_error_pathid, 16);
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iucv_available = 1;
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rc = bus_register(&iucv_bus);
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if (rc)
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goto out_cpu;
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goto out_reboot;
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return 0;
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out_reboot:
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unregister_reboot_notifier(&iucv_reboot_notifier);
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out_cpu:
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unregister_hotcpu_notifier(&iucv_cpu_notifier);
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out_free:
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@ -1783,6 +1867,7 @@ static void __exit iucv_exit(void)
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list_for_each_entry_safe(p, n, &iucv_work_queue, list)
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kfree(p);
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spin_unlock_irq(&iucv_queue_lock);
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unregister_reboot_notifier(&iucv_reboot_notifier);
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unregister_hotcpu_notifier(&iucv_cpu_notifier);
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for_each_possible_cpu(cpu) {
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kfree(iucv_param_irq[cpu]);
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