[IA64] Implement smp_call_function_mask for ia64
This interface provides more flexible functionality for smp infrastructure ... e.g. KVM frequently needs to operate on a subset of cpus. Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
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2 changed files with 85 additions and 0 deletions
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@ -209,6 +209,19 @@ send_IPI_allbutself (int op)
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}
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}
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}
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/*
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* Called with preemption disabled.
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*/
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static inline void
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send_IPI_mask(cpumask_t mask, int op)
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{
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unsigned int cpu;
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for_each_cpu_mask(cpu, mask) {
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send_IPI_single(cpu, op);
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}
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}
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/*
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/*
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* Called with preemption disabled.
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* Called with preemption disabled.
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*/
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*/
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@ -401,6 +414,75 @@ smp_call_function_single (int cpuid, void (*func) (void *info), void *info, int
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}
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}
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EXPORT_SYMBOL(smp_call_function_single);
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EXPORT_SYMBOL(smp_call_function_single);
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/**
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* smp_call_function_mask(): Run a function on a set of other CPUs.
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* <mask> The set of cpus to run on. Must not include the current cpu.
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* <func> The function to run. This must be fast and non-blocking.
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* <info> An arbitrary pointer to pass to the function.
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* <wait> If true, wait (atomically) until function
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* has completed on other CPUs.
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*
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* Returns 0 on success, else a negative status code.
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*
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* If @wait is true, then returns once @func has returned; otherwise
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* it returns just before the target cpu calls @func.
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*
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* You must not call this function with disabled interrupts or from a
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* hardware interrupt handler or from a bottom half handler.
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*/
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int smp_call_function_mask(cpumask_t mask,
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void (*func)(void *), void *info,
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int wait)
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{
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struct call_data_struct data;
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cpumask_t allbutself;
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int cpus;
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spin_lock(&call_lock);
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allbutself = cpu_online_map;
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cpu_clear(smp_processor_id(), allbutself);
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cpus_and(mask, mask, allbutself);
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cpus = cpus_weight(mask);
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if (!cpus) {
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spin_unlock(&call_lock);
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return 0;
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}
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/* Can deadlock when called with interrupts disabled */
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WARN_ON(irqs_disabled());
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data.func = func;
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data.info = info;
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atomic_set(&data.started, 0);
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data.wait = wait;
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if (wait)
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atomic_set(&data.finished, 0);
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call_data = &data;
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mb(); /* ensure store to call_data precedes setting of IPI_CALL_FUNC*/
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/* Send a message to other CPUs */
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if (cpus_equal(mask, allbutself))
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send_IPI_allbutself(IPI_CALL_FUNC);
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else
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send_IPI_mask(mask, IPI_CALL_FUNC);
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/* Wait for response */
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while (atomic_read(&data.started) != cpus)
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cpu_relax();
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if (wait)
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while (atomic_read(&data.finished) != cpus)
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cpu_relax();
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call_data = NULL;
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spin_unlock(&call_lock);
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return 0;
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}
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EXPORT_SYMBOL(smp_call_function_mask);
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/*
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/*
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* this function sends a 'generic call function' IPI to all other CPUs
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* this function sends a 'generic call function' IPI to all other CPUs
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* in the system.
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* in the system.
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@ -38,6 +38,9 @@ ia64_get_lid (void)
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return lid.f.id << 8 | lid.f.eid;
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return lid.f.id << 8 | lid.f.eid;
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}
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}
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extern int smp_call_function_mask(cpumask_t mask, void (*func)(void *),
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void *info, int wait);
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#define hard_smp_processor_id() ia64_get_lid()
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#define hard_smp_processor_id() ia64_get_lid()
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#ifdef CONFIG_SMP
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#ifdef CONFIG_SMP
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