forked from luck/tmp_suning_uos_patched
[PATCH] i386/x86-64: Remove un/set_nmi_callback and reserve/release_lapic_nmi functions
Removes the un/set_nmi_callback and reserve/release_lapic_nmi functions as they are no longer needed. The various subsystems are modified to register with the die_notifier instead. Also includes compile fixes by Andrew Morton. Signed-off-by: Don Zickus <dzickus@redhat.com> Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
parent
957dc87c1b
commit
2fbe7b25c8
@ -22,6 +22,8 @@
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#include <asm/nmi.h>
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#include <asm/hw_irq.h>
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#include <asm/apic.h>
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#include <asm/kdebug.h>
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#include <mach_ipi.h>
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@ -93,9 +95,18 @@ static void crash_save_self(struct pt_regs *regs)
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#if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
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static atomic_t waiting_for_crash_ipi;
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static int crash_nmi_callback(struct pt_regs *regs, int cpu)
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static int crash_nmi_callback(struct notifier_block *self,
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unsigned long val, void *data)
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{
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struct pt_regs *regs;
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struct pt_regs fixed_regs;
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int cpu;
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if (val != DIE_NMI)
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return NOTIFY_OK;
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regs = ((struct die_args *)data)->regs;
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cpu = raw_smp_processor_id();
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/* Don't do anything if this handler is invoked on crashing cpu.
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* Otherwise, system will completely hang. Crashing cpu can get
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@ -125,13 +136,18 @@ static void smp_send_nmi_allbutself(void)
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send_IPI_allbutself(NMI_VECTOR);
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}
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static struct notifier_block crash_nmi_nb = {
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.notifier_call = crash_nmi_callback,
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};
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static void nmi_shootdown_cpus(void)
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{
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unsigned long msecs;
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atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
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/* Would it be better to replace the trap vector here? */
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set_nmi_callback(crash_nmi_callback);
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if (register_die_notifier(&crash_nmi_nb))
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return; /* return what? */
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/* Ensure the new callback function is set before sending
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* out the NMI
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*/
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@ -42,20 +42,6 @@ static DEFINE_PER_CPU(unsigned long, evntsel_nmi_owner[3]);
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*/
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#define NMI_MAX_COUNTER_BITS 66
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/*
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* lapic_nmi_owner tracks the ownership of the lapic NMI hardware:
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* - it may be reserved by some other driver, or not
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* - when not reserved by some other driver, it may be used for
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* the NMI watchdog, or not
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*
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* This is maintained separately from nmi_active because the NMI
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* watchdog may also be driven from the I/O APIC timer.
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*/
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static DEFINE_SPINLOCK(lapic_nmi_owner_lock);
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static unsigned int lapic_nmi_owner;
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#define LAPIC_NMI_WATCHDOG (1<<0)
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#define LAPIC_NMI_RESERVED (1<<1)
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/* nmi_active:
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* >0: the lapic NMI watchdog is active, but can be disabled
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* <0: the lapic NMI watchdog has not been set up, and cannot
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@ -325,33 +311,6 @@ static void enable_lapic_nmi_watchdog(void)
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touch_nmi_watchdog();
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}
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int reserve_lapic_nmi(void)
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{
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unsigned int old_owner;
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spin_lock(&lapic_nmi_owner_lock);
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old_owner = lapic_nmi_owner;
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lapic_nmi_owner |= LAPIC_NMI_RESERVED;
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spin_unlock(&lapic_nmi_owner_lock);
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if (old_owner & LAPIC_NMI_RESERVED)
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return -EBUSY;
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if (old_owner & LAPIC_NMI_WATCHDOG)
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disable_lapic_nmi_watchdog();
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return 0;
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}
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void release_lapic_nmi(void)
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{
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unsigned int new_owner;
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spin_lock(&lapic_nmi_owner_lock);
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new_owner = lapic_nmi_owner & ~LAPIC_NMI_RESERVED;
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lapic_nmi_owner = new_owner;
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spin_unlock(&lapic_nmi_owner_lock);
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if (new_owner & LAPIC_NMI_WATCHDOG)
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enable_lapic_nmi_watchdog();
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}
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void disable_timer_nmi_watchdog(void)
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{
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BUG_ON(nmi_watchdog != NMI_IO_APIC);
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@ -866,6 +825,15 @@ int nmi_watchdog_tick (struct pt_regs * regs, unsigned reason)
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return rc;
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}
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int do_nmi_callback(struct pt_regs * regs, int cpu)
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{
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#ifdef CONFIG_SYSCTL
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if (unknown_nmi_panic)
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return unknown_nmi_panic_callback(regs, cpu);
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#endif
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return 0;
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}
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#ifdef CONFIG_SYSCTL
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static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu)
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@ -873,37 +841,8 @@ static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu)
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unsigned char reason = get_nmi_reason();
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char buf[64];
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if (!(reason & 0xc0)) {
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sprintf(buf, "NMI received for unknown reason %02x\n", reason);
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die_nmi(regs, buf);
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}
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return 0;
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}
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/*
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* proc handler for /proc/sys/kernel/unknown_nmi_panic
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*/
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int proc_unknown_nmi_panic(ctl_table *table, int write, struct file *file,
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void __user *buffer, size_t *length, loff_t *ppos)
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{
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int old_state;
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old_state = unknown_nmi_panic;
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proc_dointvec(table, write, file, buffer, length, ppos);
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if (!!old_state == !!unknown_nmi_panic)
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return 0;
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if (unknown_nmi_panic) {
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if (reserve_lapic_nmi() < 0) {
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unknown_nmi_panic = 0;
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return -EBUSY;
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} else {
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set_nmi_callback(unknown_nmi_panic_callback);
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}
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} else {
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release_lapic_nmi();
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unset_nmi_callback();
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}
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sprintf(buf, "NMI received for unknown reason %02x\n", reason);
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die_nmi(regs, buf);
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return 0;
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}
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@ -917,7 +856,5 @@ EXPORT_SYMBOL(reserve_perfctr_nmi);
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EXPORT_SYMBOL(release_perfctr_nmi);
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EXPORT_SYMBOL(reserve_evntsel_nmi);
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EXPORT_SYMBOL(release_evntsel_nmi);
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EXPORT_SYMBOL(reserve_lapic_nmi);
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EXPORT_SYMBOL(release_lapic_nmi);
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EXPORT_SYMBOL(disable_timer_nmi_watchdog);
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EXPORT_SYMBOL(enable_timer_nmi_watchdog);
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@ -706,13 +706,6 @@ void die_nmi (struct pt_regs *regs, const char *msg)
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do_exit(SIGSEGV);
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}
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static int dummy_nmi_callback(struct pt_regs * regs, int cpu)
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{
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return 0;
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}
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static nmi_callback_t nmi_callback = dummy_nmi_callback;
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static void default_do_nmi(struct pt_regs * regs)
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{
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unsigned char reason = 0;
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@ -732,9 +725,10 @@ static void default_do_nmi(struct pt_regs * regs)
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*/
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if (nmi_watchdog_tick(regs, reason))
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return;
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if (!do_nmi_callback(regs, smp_processor_id()))
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#endif
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if (!rcu_dereference(nmi_callback)(regs, smp_processor_id()))
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unknown_nmi_error(reason, regs);
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return;
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}
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if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
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@ -765,19 +759,6 @@ fastcall void do_nmi(struct pt_regs * regs, long error_code)
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nmi_exit();
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}
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void set_nmi_callback(nmi_callback_t callback)
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{
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vmalloc_sync_all();
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rcu_assign_pointer(nmi_callback, callback);
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}
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EXPORT_SYMBOL_GPL(set_nmi_callback);
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void unset_nmi_callback(void)
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{
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nmi_callback = dummy_nmi_callback;
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}
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EXPORT_SYMBOL_GPL(unset_nmi_callback);
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#ifdef CONFIG_KPROBES
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fastcall void __kprobes do_int3(struct pt_regs *regs, long error_code)
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{
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@ -17,14 +17,15 @@
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#include <asm/nmi.h>
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#include <asm/msr.h>
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#include <asm/apic.h>
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#include <asm/kdebug.h>
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#include "op_counter.h"
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#include "op_x86_model.h"
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static struct op_x86_model_spec const * model;
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static struct op_msrs cpu_msrs[NR_CPUS];
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static unsigned long saved_lvtpc[NR_CPUS];
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static int nmi_start(void);
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static void nmi_stop(void);
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@ -82,13 +83,24 @@ static void exit_driverfs(void)
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#define exit_driverfs() do { } while (0)
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#endif /* CONFIG_PM */
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static int nmi_callback(struct pt_regs * regs, int cpu)
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int profile_exceptions_notify(struct notifier_block *self,
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unsigned long val, void *data)
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{
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return model->check_ctrs(regs, &cpu_msrs[cpu]);
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struct die_args *args = (struct die_args *)data;
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int ret = NOTIFY_DONE;
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int cpu = smp_processor_id();
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switch(val) {
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case DIE_NMI:
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if (model->check_ctrs(args->regs, &cpu_msrs[cpu]))
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ret = NOTIFY_STOP;
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break;
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default:
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break;
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}
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return ret;
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}
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static void nmi_cpu_save_registers(struct op_msrs * msrs)
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{
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unsigned int const nr_ctrs = model->num_counters;
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@ -174,27 +186,29 @@ static void nmi_cpu_setup(void * dummy)
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apic_write(APIC_LVTPC, APIC_DM_NMI);
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}
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static struct notifier_block profile_exceptions_nb = {
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.notifier_call = profile_exceptions_notify,
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.next = NULL,
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.priority = 0
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};
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static int nmi_setup(void)
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{
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int err=0;
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if (!allocate_msrs())
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return -ENOMEM;
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/* We walk a thin line between law and rape here.
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* We need to be careful to install our NMI handler
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* without actually triggering any NMIs as this will
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* break the core code horrifically.
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*/
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if (reserve_lapic_nmi() < 0) {
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if ((err = register_die_notifier(&profile_exceptions_nb))){
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free_msrs();
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return -EBUSY;
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return err;
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}
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/* We need to serialize save and setup for HT because the subset
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* of msrs are distinct for save and setup operations
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*/
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on_each_cpu(nmi_save_registers, NULL, 0, 1);
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on_each_cpu(nmi_cpu_setup, NULL, 0, 1);
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set_nmi_callback(nmi_callback);
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nmi_enabled = 1;
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return 0;
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}
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@ -250,8 +264,7 @@ static void nmi_shutdown(void)
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{
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nmi_enabled = 0;
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on_each_cpu(nmi_cpu_shutdown, NULL, 0, 1);
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unset_nmi_callback();
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release_lapic_nmi();
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unregister_die_notifier(&profile_exceptions_nb);
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free_msrs();
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}
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@ -17,32 +17,49 @@
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#include <asm/nmi.h>
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#include <asm/apic.h>
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#include <asm/ptrace.h>
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#include <asm/kdebug.h>
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static int nmi_timer_callback(struct pt_regs * regs, int cpu)
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int profile_timer_exceptions_notify(struct notifier_block *self,
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unsigned long val, void *data)
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{
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oprofile_add_sample(regs, 0);
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return 1;
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struct die_args *args = (struct die_args *)data;
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int ret = NOTIFY_DONE;
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switch(val) {
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case DIE_NMI:
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oprofile_add_sample(args->regs, 0);
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ret = NOTIFY_STOP;
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break;
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default:
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break;
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}
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return ret;
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}
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static struct notifier_block profile_timer_exceptions_nb = {
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.notifier_call = profile_timer_exceptions_notify,
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.next = NULL,
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.priority = 0
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};
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static int timer_start(void)
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{
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disable_timer_nmi_watchdog();
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set_nmi_callback(nmi_timer_callback);
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if (register_die_notifier(&profile_timer_exceptions_nb))
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return 1;
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return 0;
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}
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static void timer_stop(void)
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{
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enable_timer_nmi_watchdog();
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unset_nmi_callback();
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unregister_die_notifier(&profile_timer_exceptions_nb);
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synchronize_sched(); /* Allow already-started NMIs to complete. */
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}
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int __init op_nmi_timer_init(struct oprofile_operations * ops)
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{
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if (atomic_read(&nmi_active) <= 0)
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if ((nmi_watchdog != NMI_IO_APIC) || (atomic_read(&nmi_active) <= 0))
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return -ENODEV;
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ops->start = timer_start;
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@ -23,6 +23,7 @@
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#include <asm/nmi.h>
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#include <asm/hw_irq.h>
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#include <asm/mach_apic.h>
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#include <asm/kdebug.h>
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/* This keeps a track of which one is crashing cpu. */
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static int crashing_cpu;
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@ -95,8 +96,18 @@ static void crash_save_self(struct pt_regs *regs)
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#ifdef CONFIG_SMP
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static atomic_t waiting_for_crash_ipi;
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static int crash_nmi_callback(struct pt_regs *regs, int cpu)
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static int crash_nmi_callback(struct notifier_block *self,
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unsigned long val, void *data)
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{
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struct pt_regs *regs;
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int cpu;
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if (val != DIE_NMI)
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return NOTIFY_OK;
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regs = ((struct die_args *)data)->regs;
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cpu = raw_smp_processor_id();
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/*
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* Don't do anything if this handler is invoked on crashing cpu.
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* Otherwise, system will completely hang. Crashing cpu can get
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@ -127,12 +138,17 @@ static void smp_send_nmi_allbutself(void)
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* cpu hotplug shouldn't matter.
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*/
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static struct notifier_block crash_nmi_nb = {
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.notifier_call = crash_nmi_callback,
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};
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static void nmi_shootdown_cpus(void)
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{
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unsigned long msecs;
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atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
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set_nmi_callback(crash_nmi_callback);
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if (register_die_notifier(&crash_nmi_nb))
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return; /* return what? */
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/*
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* Ensure the new callback function is set before sending
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@ -41,20 +41,6 @@ static DEFINE_PER_CPU(unsigned, evntsel_nmi_owner[2]);
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*/
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#define NMI_MAX_COUNTER_BITS 66
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/*
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* lapic_nmi_owner tracks the ownership of the lapic NMI hardware:
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* - it may be reserved by some other driver, or not
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* - when not reserved by some other driver, it may be used for
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* the NMI watchdog, or not
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*
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* This is maintained separately from nmi_active because the NMI
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* watchdog may also be driven from the I/O APIC timer.
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*/
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static DEFINE_SPINLOCK(lapic_nmi_owner_lock);
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static unsigned int lapic_nmi_owner;
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#define LAPIC_NMI_WATCHDOG (1<<0)
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#define LAPIC_NMI_RESERVED (1<<1)
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/* nmi_active:
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* >0: the lapic NMI watchdog is active, but can be disabled
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* <0: the lapic NMI watchdog has not been set up, and cannot
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@ -321,33 +307,6 @@ static void enable_lapic_nmi_watchdog(void)
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touch_nmi_watchdog();
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}
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int reserve_lapic_nmi(void)
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{
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unsigned int old_owner;
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spin_lock(&lapic_nmi_owner_lock);
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old_owner = lapic_nmi_owner;
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lapic_nmi_owner |= LAPIC_NMI_RESERVED;
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spin_unlock(&lapic_nmi_owner_lock);
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if (old_owner & LAPIC_NMI_RESERVED)
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return -EBUSY;
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if (old_owner & LAPIC_NMI_WATCHDOG)
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disable_lapic_nmi_watchdog();
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return 0;
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}
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void release_lapic_nmi(void)
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{
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unsigned int new_owner;
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spin_lock(&lapic_nmi_owner_lock);
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new_owner = lapic_nmi_owner & ~LAPIC_NMI_RESERVED;
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lapic_nmi_owner = new_owner;
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spin_unlock(&lapic_nmi_owner_lock);
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if (new_owner & LAPIC_NMI_WATCHDOG)
|
||||
enable_lapic_nmi_watchdog();
|
||||
}
|
||||
|
||||
void disable_timer_nmi_watchdog(void)
|
||||
{
|
||||
BUG_ON(nmi_watchdog != NMI_IO_APIC);
|
||||
@ -762,13 +721,6 @@ int __kprobes nmi_watchdog_tick(struct pt_regs * regs, unsigned reason)
|
||||
return rc;
|
||||
}
|
||||
|
||||
static __kprobes int dummy_nmi_callback(struct pt_regs * regs, int cpu)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static nmi_callback_t nmi_callback = dummy_nmi_callback;
|
||||
|
||||
asmlinkage __kprobes void do_nmi(struct pt_regs * regs, long error_code)
|
||||
{
|
||||
nmi_enter();
|
||||
@ -779,22 +731,13 @@ asmlinkage __kprobes void do_nmi(struct pt_regs * regs, long error_code)
|
||||
|
||||
int do_nmi_callback(struct pt_regs * regs, int cpu)
|
||||
{
|
||||
return rcu_dereference(nmi_callback)(regs, cpu);
|
||||
#ifdef CONFIG_SYSCTL
|
||||
if (unknown_nmi_panic)
|
||||
return unknown_nmi_panic_callback(regs, cpu);
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
void set_nmi_callback(nmi_callback_t callback)
|
||||
{
|
||||
vmalloc_sync_all();
|
||||
rcu_assign_pointer(nmi_callback, callback);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(set_nmi_callback);
|
||||
|
||||
void unset_nmi_callback(void)
|
||||
{
|
||||
nmi_callback = dummy_nmi_callback;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(unset_nmi_callback);
|
||||
|
||||
#ifdef CONFIG_SYSCTL
|
||||
|
||||
static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu)
|
||||
@ -802,37 +745,8 @@ static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu)
|
||||
unsigned char reason = get_nmi_reason();
|
||||
char buf[64];
|
||||
|
||||
if (!(reason & 0xc0)) {
|
||||
sprintf(buf, "NMI received for unknown reason %02x\n", reason);
|
||||
die_nmi(buf,regs);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* proc handler for /proc/sys/kernel/unknown_nmi_panic
|
||||
*/
|
||||
int proc_unknown_nmi_panic(struct ctl_table *table, int write, struct file *file,
|
||||
void __user *buffer, size_t *length, loff_t *ppos)
|
||||
{
|
||||
int old_state;
|
||||
|
||||
old_state = unknown_nmi_panic;
|
||||
proc_dointvec(table, write, file, buffer, length, ppos);
|
||||
if (!!old_state == !!unknown_nmi_panic)
|
||||
return 0;
|
||||
|
||||
if (unknown_nmi_panic) {
|
||||
if (reserve_lapic_nmi() < 0) {
|
||||
unknown_nmi_panic = 0;
|
||||
return -EBUSY;
|
||||
} else {
|
||||
set_nmi_callback(unknown_nmi_panic_callback);
|
||||
}
|
||||
} else {
|
||||
release_lapic_nmi();
|
||||
unset_nmi_callback();
|
||||
}
|
||||
sprintf(buf, "NMI received for unknown reason %02x\n", reason);
|
||||
die_nmi(buf,regs);
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -846,8 +760,6 @@ EXPORT_SYMBOL(reserve_perfctr_nmi);
|
||||
EXPORT_SYMBOL(release_perfctr_nmi);
|
||||
EXPORT_SYMBOL(reserve_evntsel_nmi);
|
||||
EXPORT_SYMBOL(release_evntsel_nmi);
|
||||
EXPORT_SYMBOL(reserve_lapic_nmi);
|
||||
EXPORT_SYMBOL(release_lapic_nmi);
|
||||
EXPORT_SYMBOL(disable_timer_nmi_watchdog);
|
||||
EXPORT_SYMBOL(enable_timer_nmi_watchdog);
|
||||
EXPORT_SYMBOL(touch_nmi_watchdog);
|
||||
|
@ -6,24 +6,13 @@
|
||||
|
||||
#include <linux/pm.h>
|
||||
|
||||
struct pt_regs;
|
||||
|
||||
typedef int (*nmi_callback_t)(struct pt_regs * regs, int cpu);
|
||||
|
||||
/**
|
||||
* set_nmi_callback
|
||||
* do_nmi_callback
|
||||
*
|
||||
* Set a handler for an NMI. Only one handler may be
|
||||
* set. Return 1 if the NMI was handled.
|
||||
* Check to see if a callback exists and execute it. Return 1
|
||||
* if the handler exists and was handled successfully.
|
||||
*/
|
||||
void set_nmi_callback(nmi_callback_t callback);
|
||||
|
||||
/**
|
||||
* unset_nmi_callback
|
||||
*
|
||||
* Remove the handler previously set.
|
||||
*/
|
||||
void unset_nmi_callback(void);
|
||||
int do_nmi_callback(struct pt_regs *regs, int cpu);
|
||||
|
||||
extern int avail_to_resrv_perfctr_nmi_bit(unsigned int);
|
||||
extern int avail_to_resrv_perfctr_nmi(unsigned int);
|
||||
@ -33,8 +22,6 @@ extern int reserve_evntsel_nmi(unsigned int);
|
||||
extern void release_evntsel_nmi(unsigned int);
|
||||
|
||||
extern void setup_apic_nmi_watchdog (void *);
|
||||
extern int reserve_lapic_nmi(void);
|
||||
extern void release_lapic_nmi(void);
|
||||
extern void disable_timer_nmi_watchdog(void);
|
||||
extern void enable_timer_nmi_watchdog(void);
|
||||
extern int nmi_watchdog_tick (struct pt_regs * regs, unsigned reason);
|
||||
|
@ -7,25 +7,6 @@
|
||||
#include <linux/pm.h>
|
||||
#include <asm/io.h>
|
||||
|
||||
struct pt_regs;
|
||||
|
||||
typedef int (*nmi_callback_t)(struct pt_regs * regs, int cpu);
|
||||
|
||||
/**
|
||||
* set_nmi_callback
|
||||
*
|
||||
* Set a handler for an NMI. Only one handler may be
|
||||
* set. Return 1 if the NMI was handled.
|
||||
*/
|
||||
void set_nmi_callback(nmi_callback_t callback);
|
||||
|
||||
/**
|
||||
* unset_nmi_callback
|
||||
*
|
||||
* Remove the handler previously set.
|
||||
*/
|
||||
void unset_nmi_callback(void);
|
||||
|
||||
/**
|
||||
* do_nmi_callback
|
||||
*
|
||||
@ -72,8 +53,6 @@ extern int reserve_evntsel_nmi(unsigned int);
|
||||
extern void release_evntsel_nmi(unsigned int);
|
||||
|
||||
extern void setup_apic_nmi_watchdog (void *);
|
||||
extern int reserve_lapic_nmi(void);
|
||||
extern void release_lapic_nmi(void);
|
||||
extern void disable_timer_nmi_watchdog(void);
|
||||
extern void enable_timer_nmi_watchdog(void);
|
||||
extern int nmi_watchdog_tick (struct pt_regs * regs, unsigned reason);
|
||||
|
@ -76,8 +76,6 @@ extern int compat_log;
|
||||
|
||||
#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
|
||||
int unknown_nmi_panic;
|
||||
extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *,
|
||||
void __user *, size_t *, loff_t *);
|
||||
#endif
|
||||
|
||||
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
|
||||
@ -628,7 +626,7 @@ static ctl_table kern_table[] = {
|
||||
.data = &unknown_nmi_panic,
|
||||
.maxlen = sizeof (int),
|
||||
.mode = 0644,
|
||||
.proc_handler = &proc_unknown_nmi_panic,
|
||||
.proc_handler = &proc_dointvec,
|
||||
},
|
||||
#endif
|
||||
#if defined(CONFIG_X86)
|
||||
|
Loading…
Reference in New Issue
Block a user