diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-04 22:57:00 +0000 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-11-05 13:07:51 +0100 |
| commit | 539da7877275edb21a76aa02fb2c147eff02c559 (patch) | |
| tree | 3ea82cce6b2d2e77ba3b2ec2894c40b3d65fb43a | |
| parent | 66ef3493d4bb387f5a83915e33dc893102fd1b43 (diff) | |
x86/apic: Add a single-target IPI function to the apic
We still fall back on the "send mask" versions if an apic definition
doesn't have the single-target version, but at least this allows the
(trivial) case for the common clustered x2apic case.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@alien.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Travis <travis@sgi.com>
Cc: Daniel J Blueman <daniel@numascale.com>
Link: http://lkml.kernel.org/r/20151104220848.737120838@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | arch/x86/include/asm/apic.h | 1 | ||||
| -rw-r--r-- | arch/x86/kernel/smp.c | 16 |
2 files changed, 15 insertions, 2 deletions
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h index a30316bf801a..7f62ad47d7e4 100644 --- a/arch/x86/include/asm/apic.h +++ b/arch/x86/include/asm/apic.h @@ -303,6 +303,7 @@ struct apic { unsigned int *apicid); /* ipi */ + void (*send_IPI)(int cpu, int vector); void (*send_IPI_mask)(const struct cpumask *mask, int vector); void (*send_IPI_mask_allbutself)(const struct cpumask *mask, int vector); diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c index 12c8286206ce..1dbf590cdd89 100644 --- a/arch/x86/kernel/smp.c +++ b/arch/x86/kernel/smp.c @@ -115,6 +115,18 @@ static atomic_t stopping_cpu = ATOMIC_INIT(-1); static bool smp_no_nmi_ipi = false; /* + * Helper wrapper: not all apic definitions support sending to + * a single CPU, so we fall back to sending to a mask. + */ +static void send_IPI_cpu(int cpu, int vector) +{ + if (apic->send_IPI) + apic->send_IPI(cpu, vector); + else + apic->send_IPI_mask(cpumask_of(cpu), vector); +} + +/* * this function sends a 'reschedule' IPI to another CPU. * it goes straight through and wastes no time serializing * anything. Worst case is that we lose a reschedule ... @@ -125,12 +137,12 @@ static void native_smp_send_reschedule(int cpu) WARN_ON(1); return; } - apic->send_IPI_mask(cpumask_of(cpu), RESCHEDULE_VECTOR); + send_IPI_cpu(cpu, RESCHEDULE_VECTOR); } void native_send_call_func_single_ipi(int cpu) { - apic->send_IPI_mask(cpumask_of(cpu), CALL_FUNCTION_SINGLE_VECTOR); + send_IPI_cpu(cpu, CALL_FUNCTION_SINGLE_VECTOR); } void native_send_call_func_ipi(const struct cpumask *mask) |