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f39650de68
kernel.h is being used as a dump for all kinds of stuff for a long time. Here is the attempt to start cleaning it up by splitting out panic and oops helpers. There are several purposes of doing this: - dropping dependency in bug.h - dropping a loop by moving out panic_notifier.h - unload kernel.h from something which has its own domain At the same time convert users tree-wide to use new headers, although for the time being include new header back to kernel.h to avoid twisted indirected includes for existing users. [akpm@linux-foundation.org: thread_info.h needs limits.h] [andriy.shevchenko@linux.intel.com: ia64 fix] Link: https://lkml.kernel.org/r/20210520130557.55277-1-andriy.shevchenko@linux.intel.com Link: https://lkml.kernel.org/r/20210511074137.33666-1-andriy.shevchenko@linux.intel.com Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Co-developed-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Mike Rapoport <rppt@linux.ibm.com> Acked-by: Corey Minyard <cminyard@mvista.com> Acked-by: Christian Brauner <christian.brauner@ubuntu.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Kees Cook <keescook@chromium.org> Acked-by: Wei Liu <wei.liu@kernel.org> Acked-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Sebastian Reichel <sre@kernel.org> Acked-by: Luis Chamberlain <mcgrof@kernel.org> Acked-by: Stephen Boyd <sboyd@kernel.org> Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Acked-by: Helge Deller <deller@gmx.de> # parisc Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
115 lines
2.3 KiB
C
115 lines
2.3 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/panic_notifier.h>
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#include <linux/types.h>
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#include <linux/cdev.h>
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#include <linux/list.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 struct list_head pvpanic_list;
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static spinlock_t pvpanic_lock;
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static void
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pvpanic_send_event(unsigned int event)
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{
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struct pvpanic_instance *pi_cur;
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spin_lock(&pvpanic_lock);
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list_for_each_entry(pi_cur, &pvpanic_list, list) {
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if (event & pi_cur->capability & pi_cur->events)
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iowrite8(event, pi_cur->base);
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}
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spin_unlock(&pvpanic_lock);
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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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int pvpanic_probe(struct pvpanic_instance *pi)
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{
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if (!pi || !pi->base)
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return -EINVAL;
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spin_lock(&pvpanic_lock);
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list_add(&pi->list, &pvpanic_list);
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spin_unlock(&pvpanic_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(pvpanic_probe);
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void pvpanic_remove(struct pvpanic_instance *pi)
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{
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struct pvpanic_instance *pi_cur, *pi_next;
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if (!pi)
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return;
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spin_lock(&pvpanic_lock);
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list_for_each_entry_safe(pi_cur, pi_next, &pvpanic_list, list) {
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if (pi_cur == pi) {
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list_del(&pi_cur->list);
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break;
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}
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}
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spin_unlock(&pvpanic_lock);
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}
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EXPORT_SYMBOL_GPL(pvpanic_remove);
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static int pvpanic_init(void)
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{
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INIT_LIST_HEAD(&pvpanic_list);
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spin_lock_init(&pvpanic_lock);
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atomic_notifier_chain_register(&panic_notifier_list,
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&pvpanic_panic_nb);
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return 0;
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}
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static void pvpanic_exit(void)
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{
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atomic_notifier_chain_unregister(&panic_notifier_list,
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&pvpanic_panic_nb);
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}
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module_init(pvpanic_init);
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module_exit(pvpanic_exit);
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