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f36e7c9845
Remove my old invalid email address which can be found in a couple of files. Instead of updating it, just remove my contact data completely from source files. We have git and other tools which allow to figure out who is responsible for what with recent contact data. Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
163 lines
4.1 KiB
C
163 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Channel report handling code
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*
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* Copyright IBM Corp. 2000, 2009
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* Author(s): Ingo Adlung <adlung@de.ibm.com>,
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* Martin Schwidefsky <schwidefsky@de.ibm.com>,
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* Cornelia Huck <cornelia.huck@de.ibm.com>,
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*/
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#include <linux/mutex.h>
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#include <linux/kthread.h>
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#include <linux/init.h>
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#include <linux/wait.h>
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#include <asm/crw.h>
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#include <asm/ctl_reg.h>
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#include "ioasm.h"
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static DEFINE_MUTEX(crw_handler_mutex);
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static crw_handler_t crw_handlers[NR_RSCS];
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static atomic_t crw_nr_req = ATOMIC_INIT(0);
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static DECLARE_WAIT_QUEUE_HEAD(crw_handler_wait_q);
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/**
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* crw_register_handler() - register a channel report word handler
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* @rsc: reporting source code to handle
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* @handler: handler to be registered
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*
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* Returns %0 on success and a negative error value otherwise.
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*/
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int crw_register_handler(int rsc, crw_handler_t handler)
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{
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int rc = 0;
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if ((rsc < 0) || (rsc >= NR_RSCS))
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return -EINVAL;
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mutex_lock(&crw_handler_mutex);
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if (crw_handlers[rsc])
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rc = -EBUSY;
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else
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crw_handlers[rsc] = handler;
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mutex_unlock(&crw_handler_mutex);
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return rc;
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}
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/**
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* crw_unregister_handler() - unregister a channel report word handler
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* @rsc: reporting source code to handle
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*/
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void crw_unregister_handler(int rsc)
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{
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if ((rsc < 0) || (rsc >= NR_RSCS))
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return;
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mutex_lock(&crw_handler_mutex);
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crw_handlers[rsc] = NULL;
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mutex_unlock(&crw_handler_mutex);
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}
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/*
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* Retrieve CRWs and call function to handle event.
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*/
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static int crw_collect_info(void *unused)
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{
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struct crw crw[2];
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int ccode, signal;
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unsigned int chain;
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repeat:
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signal = wait_event_interruptible(crw_handler_wait_q,
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atomic_read(&crw_nr_req) > 0);
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if (unlikely(signal))
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atomic_inc(&crw_nr_req);
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chain = 0;
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while (1) {
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crw_handler_t handler;
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if (unlikely(chain > 1)) {
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struct crw tmp_crw;
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printk(KERN_WARNING"%s: Code does not support more "
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"than two chained crws; please report to "
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"linux390@de.ibm.com!\n", __func__);
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ccode = stcrw(&tmp_crw);
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printk(KERN_WARNING"%s: crw reports slct=%d, oflw=%d, "
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"chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
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__func__, tmp_crw.slct, tmp_crw.oflw,
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tmp_crw.chn, tmp_crw.rsc, tmp_crw.anc,
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tmp_crw.erc, tmp_crw.rsid);
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printk(KERN_WARNING"%s: This was crw number %x in the "
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"chain\n", __func__, chain);
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if (ccode != 0)
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break;
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chain = tmp_crw.chn ? chain + 1 : 0;
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continue;
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}
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ccode = stcrw(&crw[chain]);
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if (ccode != 0)
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break;
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printk(KERN_DEBUG "crw_info : CRW reports slct=%d, oflw=%d, "
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"chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
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crw[chain].slct, crw[chain].oflw, crw[chain].chn,
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crw[chain].rsc, crw[chain].anc, crw[chain].erc,
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crw[chain].rsid);
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/* Check for overflows. */
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if (crw[chain].oflw) {
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int i;
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pr_debug("%s: crw overflow detected!\n", __func__);
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mutex_lock(&crw_handler_mutex);
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for (i = 0; i < NR_RSCS; i++) {
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if (crw_handlers[i])
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crw_handlers[i](NULL, NULL, 1);
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}
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mutex_unlock(&crw_handler_mutex);
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chain = 0;
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continue;
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}
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if (crw[0].chn && !chain) {
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chain++;
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continue;
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}
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mutex_lock(&crw_handler_mutex);
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handler = crw_handlers[crw[chain].rsc];
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if (handler)
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handler(&crw[0], chain ? &crw[1] : NULL, 0);
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mutex_unlock(&crw_handler_mutex);
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/* chain is always 0 or 1 here. */
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chain = crw[chain].chn ? chain + 1 : 0;
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}
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if (atomic_dec_and_test(&crw_nr_req))
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wake_up(&crw_handler_wait_q);
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goto repeat;
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return 0;
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}
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void crw_handle_channel_report(void)
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{
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atomic_inc(&crw_nr_req);
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wake_up(&crw_handler_wait_q);
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}
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void crw_wait_for_channel_report(void)
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{
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crw_handle_channel_report();
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wait_event(crw_handler_wait_q, atomic_read(&crw_nr_req) == 0);
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}
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/*
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* Machine checks for the channel subsystem must be enabled
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* after the channel subsystem is initialized
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*/
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static int __init crw_machine_check_init(void)
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{
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struct task_struct *task;
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task = kthread_run(crw_collect_info, NULL, "kmcheck");
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if (IS_ERR(task))
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return PTR_ERR(task);
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ctl_set_bit(14, 28); /* enable channel report MCH */
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return 0;
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}
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device_initcall(crw_machine_check_init);
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