From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- drivers/s390/cio/airq.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 drivers/s390/cio/airq.c (limited to 'drivers/s390/cio/airq.c') diff --git a/drivers/s390/cio/airq.c b/drivers/s390/cio/airq.c new file mode 100644 index 00000000000..3720e77b465 --- /dev/null +++ b/drivers/s390/cio/airq.c @@ -0,0 +1,87 @@ +/* + * drivers/s390/cio/airq.c + * S/390 common I/O routines -- support for adapter interruptions + * + * $Revision: 1.12 $ + * + * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH, + * IBM Corporation + * Author(s): Ingo Adlung (adlung@de.ibm.com) + * Cornelia Huck (cohuck@de.ibm.com) + * Arnd Bergmann (arndb@de.ibm.com) + */ + +#include +#include +#include +#include + +#include "cio_debug.h" +#include "airq.h" + +static adapter_int_handler_t adapter_handler; + +/* + * register for adapter interrupts + * + * With HiperSockets the zSeries architecture provides for + * means of adapter interrups, pseudo I/O interrupts that are + * not tied to an I/O subchannel, but to an adapter. However, + * it doesn't disclose the info how to enable/disable them, but + * to recognize them only. Perhaps we should consider them + * being shared interrupts, and thus build a linked list + * of adapter handlers ... to be evaluated ... + */ +int +s390_register_adapter_interrupt (adapter_int_handler_t handler) +{ + int ret; + char dbf_txt[15]; + + CIO_TRACE_EVENT (4, "rgaint"); + + if (handler == NULL) + ret = -EINVAL; + else + ret = (cmpxchg(&adapter_handler, NULL, handler) ? -EBUSY : 0); + if (!ret) + synchronize_kernel(); + + sprintf (dbf_txt, "ret:%d", ret); + CIO_TRACE_EVENT (4, dbf_txt); + + return ret; +} + +int +s390_unregister_adapter_interrupt (adapter_int_handler_t handler) +{ + int ret; + char dbf_txt[15]; + + CIO_TRACE_EVENT (4, "urgaint"); + + if (handler == NULL) + ret = -EINVAL; + else { + adapter_handler = NULL; + synchronize_kernel(); + ret = 0; + } + sprintf (dbf_txt, "ret:%d", ret); + CIO_TRACE_EVENT (4, dbf_txt); + + return ret; +} + +void +do_adapter_IO (void) +{ + CIO_TRACE_EVENT (6, "doaio"); + + if (adapter_handler) + (*adapter_handler) (); +} + +EXPORT_SYMBOL (s390_register_adapter_interrupt); +EXPORT_SYMBOL (s390_unregister_adapter_interrupt); -- cgit v1.2.3