71fff5e6ca
This patch converts the x86_cpu_to_apicid array to be a per cpu variable. This saves sizeof(apicid) * NR unused cpus. Access is mostly from startup and CPU HOTPLUG functions. MP_processor_info() is one of the functions that require access to the x86_cpu_to_apicid array before the per_cpu data area is setup. For this case, a pointer to the __initdata array is initialized in setup_arch() and removed in smp_prepare_cpus() after the per_cpu data area is initialized. A second change is included to change the initial array value of ARCH i386 from 0xff to BAD_APICID to be consistent with ARCH x86_64. Signed-off-by: Mike Travis <travis@sgi.com> Cc: Andi Kleen <ak@suse.de> Cc: Christoph Lameter <clameter@sgi.com> Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
128 lines
2.7 KiB
C
128 lines
2.7 KiB
C
#ifndef __ASM_IPI_H
|
|
#define __ASM_IPI_H
|
|
|
|
/*
|
|
* Copyright 2004 James Cleverdon, IBM.
|
|
* Subject to the GNU Public License, v.2
|
|
*
|
|
* Generic APIC InterProcessor Interrupt code.
|
|
*
|
|
* Moved to include file by James Cleverdon from
|
|
* arch/x86-64/kernel/smp.c
|
|
*
|
|
* Copyrights from kernel/smp.c:
|
|
*
|
|
* (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
|
|
* (c) 1998-99, 2000 Ingo Molnar <mingo@redhat.com>
|
|
* (c) 2002,2003 Andi Kleen, SuSE Labs.
|
|
* Subject to the GNU Public License, v.2
|
|
*/
|
|
|
|
#include <asm/hw_irq.h>
|
|
#include <asm/apic.h>
|
|
|
|
/*
|
|
* the following functions deal with sending IPIs between CPUs.
|
|
*
|
|
* We use 'broadcast', CPU->CPU IPIs and self-IPIs too.
|
|
*/
|
|
|
|
static inline unsigned int __prepare_ICR (unsigned int shortcut, int vector, unsigned int dest)
|
|
{
|
|
unsigned int icr = shortcut | dest;
|
|
|
|
switch (vector) {
|
|
default:
|
|
icr |= APIC_DM_FIXED | vector;
|
|
break;
|
|
case NMI_VECTOR:
|
|
icr |= APIC_DM_NMI;
|
|
break;
|
|
}
|
|
return icr;
|
|
}
|
|
|
|
static inline int __prepare_ICR2 (unsigned int mask)
|
|
{
|
|
return SET_APIC_DEST_FIELD(mask);
|
|
}
|
|
|
|
static inline void __send_IPI_shortcut(unsigned int shortcut, int vector, unsigned int dest)
|
|
{
|
|
/*
|
|
* Subtle. In the case of the 'never do double writes' workaround
|
|
* we have to lock out interrupts to be safe. As we don't care
|
|
* of the value read we use an atomic rmw access to avoid costly
|
|
* cli/sti. Otherwise we use an even cheaper single atomic write
|
|
* to the APIC.
|
|
*/
|
|
unsigned int cfg;
|
|
|
|
/*
|
|
* Wait for idle.
|
|
*/
|
|
apic_wait_icr_idle();
|
|
|
|
/*
|
|
* No need to touch the target chip field
|
|
*/
|
|
cfg = __prepare_ICR(shortcut, vector, dest);
|
|
|
|
/*
|
|
* Send the IPI. The write to APIC_ICR fires this off.
|
|
*/
|
|
apic_write(APIC_ICR, cfg);
|
|
}
|
|
|
|
/*
|
|
* This is used to send an IPI with no shorthand notation (the destination is
|
|
* specified in bits 56 to 63 of the ICR).
|
|
*/
|
|
static inline void __send_IPI_dest_field(unsigned int mask, int vector, unsigned int dest)
|
|
{
|
|
unsigned long cfg;
|
|
|
|
/*
|
|
* Wait for idle.
|
|
*/
|
|
if (unlikely(vector == NMI_VECTOR))
|
|
safe_apic_wait_icr_idle();
|
|
else
|
|
apic_wait_icr_idle();
|
|
|
|
/*
|
|
* prepare target chip field
|
|
*/
|
|
cfg = __prepare_ICR2(mask);
|
|
apic_write(APIC_ICR2, cfg);
|
|
|
|
/*
|
|
* program the ICR
|
|
*/
|
|
cfg = __prepare_ICR(0, vector, dest);
|
|
|
|
/*
|
|
* Send the IPI. The write to APIC_ICR fires this off.
|
|
*/
|
|
apic_write(APIC_ICR, cfg);
|
|
}
|
|
|
|
static inline void send_IPI_mask_sequence(cpumask_t mask, int vector)
|
|
{
|
|
unsigned long flags;
|
|
unsigned long query_cpu;
|
|
|
|
/*
|
|
* Hack. The clustered APIC addressing mode doesn't allow us to send
|
|
* to an arbitrary mask, so I do a unicast to each CPU instead.
|
|
* - mbligh
|
|
*/
|
|
local_irq_save(flags);
|
|
for_each_cpu_mask(query_cpu, mask) {
|
|
__send_IPI_dest_field(per_cpu(x86_cpu_to_apicid, query_cpu),
|
|
vector, APIC_DEST_PHYSICAL);
|
|
}
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
#endif /* __ASM_IPI_H */
|