mirror of
https://github.com/torvalds/linux.git
synced 2024-12-26 12:52:30 +00:00
e77deacb7b
On some i386/x86_64 systems, sending an NMI IPI as a broadcast will reset the system. This seems to be a BIOS bug which affects machines where one or more cpus are not under OS control. It occurs on HT systems with a version of the OS that is not compiled without HT support. It also occurs when a system is booted with max_cpus=n where 2 <= n < cpus known to the BIOS. The fix is to always send NMI IPI as a mask instead of as a broadcast. Signed-off-by: Keith Owens <kaos@sgi.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
#ifndef __ASM_MACH_IPI_H
|
|
#define __ASM_MACH_IPI_H
|
|
|
|
/* Avoid include hell */
|
|
#define NMI_VECTOR 0x02
|
|
|
|
void send_IPI_mask_bitmask(cpumask_t mask, int vector);
|
|
void __send_IPI_shortcut(unsigned int shortcut, int vector);
|
|
|
|
extern int no_broadcast;
|
|
|
|
static inline void send_IPI_mask(cpumask_t mask, int vector)
|
|
{
|
|
send_IPI_mask_bitmask(mask, vector);
|
|
}
|
|
|
|
static inline void __local_send_IPI_allbutself(int vector)
|
|
{
|
|
if (no_broadcast || vector == NMI_VECTOR) {
|
|
cpumask_t mask = cpu_online_map;
|
|
|
|
cpu_clear(smp_processor_id(), mask);
|
|
send_IPI_mask(mask, vector);
|
|
} else
|
|
__send_IPI_shortcut(APIC_DEST_ALLBUT, vector);
|
|
}
|
|
|
|
static inline void __local_send_IPI_all(int vector)
|
|
{
|
|
if (no_broadcast || vector == NMI_VECTOR)
|
|
send_IPI_mask(cpu_online_map, vector);
|
|
else
|
|
__send_IPI_shortcut(APIC_DEST_ALLINC, vector);
|
|
}
|
|
|
|
static inline void send_IPI_allbutself(int vector)
|
|
{
|
|
/*
|
|
* if there are no other CPUs in the system then we get an APIC send
|
|
* error if we try to broadcast, thus avoid sending IPIs in this case.
|
|
*/
|
|
if (!(num_online_cpus() > 1))
|
|
return;
|
|
|
|
__local_send_IPI_allbutself(vector);
|
|
return;
|
|
}
|
|
|
|
static inline void send_IPI_all(int vector)
|
|
{
|
|
__local_send_IPI_all(vector);
|
|
}
|
|
|
|
#endif /* __ASM_MACH_IPI_H */
|