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6861d27cf5
Split-up generic and platform dependent code in order to be able to re-use generic event handling code in pvpanic PCI device driver in the next patches. The code from pvpanic.c was split in two new files: - pvpanic.c: generic code that handles pvpanic events - pvpanic-mmio.c: platform/bus dependent code Signed-off-by: Mihai Carabas <mihai.carabas@oracle.com> Link: https://lore.kernel.org/r/1616597356-20696-2-git-send-email-mihai.carabas@oracle.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
82 lines
1.7 KiB
C
82 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Pvpanic Device Support
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*
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* Copyright (C) 2013 Fujitsu.
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* Copyright (C) 2018 ZTE.
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* Copyright (C) 2021 Oracle.
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*/
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/kexec.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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#include <uapi/misc/pvpanic.h>
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#include "pvpanic.h"
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MODULE_AUTHOR("Mihai Carabas <mihai.carabas@oracle.com>");
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MODULE_DESCRIPTION("pvpanic device driver ");
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MODULE_LICENSE("GPL");
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static void __iomem *base;
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static unsigned int capability;
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static unsigned int events;
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static void
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pvpanic_send_event(unsigned int event)
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{
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if (event & capability & events)
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iowrite8(event, base);
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}
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static int
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pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,
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void *unused)
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{
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unsigned int event = PVPANIC_PANICKED;
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if (kexec_crash_loaded())
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event = PVPANIC_CRASH_LOADED;
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pvpanic_send_event(event);
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return NOTIFY_DONE;
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}
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static struct notifier_block pvpanic_panic_nb = {
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.notifier_call = pvpanic_panic_notify,
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.priority = 1, /* let this called before broken drm_fb_helper */
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};
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void pvpanic_probe(void __iomem *pbase, unsigned int dev_cap)
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{
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base = pbase;
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capability = dev_cap;
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events = capability;
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if (capability)
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atomic_notifier_chain_register(&panic_notifier_list,
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&pvpanic_panic_nb);
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}
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EXPORT_SYMBOL_GPL(pvpanic_probe);
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void pvpanic_remove(void)
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{
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if (capability)
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atomic_notifier_chain_unregister(&panic_notifier_list,
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&pvpanic_panic_nb);
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base = NULL;
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}
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EXPORT_SYMBOL_GPL(pvpanic_remove);
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void pvpanic_set_events(unsigned int dev_events)
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{
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events = dev_events;
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}
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EXPORT_SYMBOL_GPL(pvpanic_set_events);
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