88 lines
1.9 KiB
C
88 lines
1.9 KiB
C
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/*
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* drivers/s390/cio/airq.c
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* S/390 common I/O routines -- support for adapter interruptions
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*
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* $Revision: 1.12 $
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*
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* Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
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* IBM Corporation
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* Author(s): Ingo Adlung (adlung@de.ibm.com)
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* Cornelia Huck (cohuck@de.ibm.com)
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* Arnd Bergmann (arndb@de.ibm.com)
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/rcupdate.h>
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#include "cio_debug.h"
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#include "airq.h"
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static adapter_int_handler_t adapter_handler;
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/*
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* register for adapter interrupts
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*
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* With HiperSockets the zSeries architecture provides for
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* means of adapter interrups, pseudo I/O interrupts that are
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* not tied to an I/O subchannel, but to an adapter. However,
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* it doesn't disclose the info how to enable/disable them, but
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* to recognize them only. Perhaps we should consider them
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* being shared interrupts, and thus build a linked list
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* of adapter handlers ... to be evaluated ...
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*/
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int
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s390_register_adapter_interrupt (adapter_int_handler_t handler)
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{
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int ret;
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char dbf_txt[15];
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CIO_TRACE_EVENT (4, "rgaint");
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if (handler == NULL)
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ret = -EINVAL;
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else
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ret = (cmpxchg(&adapter_handler, NULL, handler) ? -EBUSY : 0);
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if (!ret)
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synchronize_kernel();
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sprintf (dbf_txt, "ret:%d", ret);
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CIO_TRACE_EVENT (4, dbf_txt);
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return ret;
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}
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int
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s390_unregister_adapter_interrupt (adapter_int_handler_t handler)
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{
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int ret;
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char dbf_txt[15];
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CIO_TRACE_EVENT (4, "urgaint");
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if (handler == NULL)
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ret = -EINVAL;
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else {
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adapter_handler = NULL;
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synchronize_kernel();
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ret = 0;
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}
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sprintf (dbf_txt, "ret:%d", ret);
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CIO_TRACE_EVENT (4, dbf_txt);
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return ret;
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}
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void
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do_adapter_IO (void)
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{
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CIO_TRACE_EVENT (6, "doaio");
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if (adapter_handler)
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(*adapter_handler) ();
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}
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EXPORT_SYMBOL (s390_register_adapter_interrupt);
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EXPORT_SYMBOL (s390_unregister_adapter_interrupt);
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