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[PATCH] i386: __send_IPI_dest_field - i386 

Implement __send_IPI_dest_field which can be used to send IPIs when the
"destination shorthand" field of the ICR is set to 00 (destination
field). Use it whenever possible.

Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Fernando Luis [** ISO-8859-1 charset **] VzquezCao 2007-05-02 19:27:18 +02:00 committed by Andi Kleen
parent 3144c332fa
commit 45ae5e968e
1 changed files with 18 additions and 29 deletions
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47
arch/i386/kernel/smp.c
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@ -165,16 +165,13 @@ void fastcall send_IPI_self(int vector)
}
/*
* This is only used on smaller machines.
* This is used to send an IPI with no shorthand notation (the destination is
* specified in bits 56 to 63 of the ICR).
*/
void send_IPI_mask_bitmask(cpumask_t cpumask, int vector)
static inline void __send_IPI_dest_field(unsigned long mask, int vector)
{
unsigned long mask = cpus_addr(cpumask)[0];
unsigned long cfg;
unsigned long flags;
local_irq_save(flags);
WARN_ON(mask & ~cpus_addr(cpu_online_map)[0]);
/*
* Wait for idle.
*/
@ -195,13 +192,25 @@ void send_IPI_mask_bitmask(cpumask_t cpumask, int vector)
* Send the IPI. The write to APIC_ICR fires this off.
*/
apic_write_around(APIC_ICR, cfg);
}
/*
* This is only used on smaller machines.
*/
void send_IPI_mask_bitmask(cpumask_t cpumask, int vector)
{
unsigned long mask = cpus_addr(cpumask)[0];
unsigned long flags;
local_irq_save(flags);
WARN_ON(mask & ~cpus_addr(cpu_online_map)[0]);
__send_IPI_dest_field(mask, vector);
local_irq_restore(flags);
}
void send_IPI_mask_sequence(cpumask_t mask, int vector)
{
unsigned long cfg, flags;
unsigned long flags;
unsigned int query_cpu;
/*
@ -211,30 +220,10 @@ void send_IPI_mask_sequence(cpumask_t mask, int vector)
*/
local_irq_save(flags);
for (query_cpu = 0; query_cpu < NR_CPUS; ++query_cpu) {
if (cpu_isset(query_cpu, mask)) {
/*
* Wait for idle.
*/
apic_wait_icr_idle();
/*
* prepare target chip field
*/
cfg = __prepare_ICR2(cpu_to_logical_apicid(query_cpu));
apic_write_around(APIC_ICR2, cfg);
/*
* program the ICR
*/
cfg = __prepare_ICR(0, vector);
/*
* Send the IPI. The write to APIC_ICR fires this off.
*/
apic_write_around(APIC_ICR, cfg);
__send_IPI_dest_field(cpu_to_logical_apicid(query_cpu),
vector);
}
}
local_irq_restore(flags);