[S390] convert s390 to generic IPI infrastructure

Since etr/stp don't need the old smp_call_function semantics anymore
we can convert s390 to the generic IPI infrastructure.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 19 insertions, 156 deletions

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index b5595688a477..176a43e5b8b4 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -77,159 +77,6 @@ static DEFINE_PER_CPU(struct cpu, cpu_devices);
 
 static void smp_ext_bitcall(int, ec_bit_sig);
 
-/*
- * Structure and data for __smp_call_function_map(). This is designed to
- * minimise static memory requirements. It also looks cleaner.
- */
-static DEFINE_SPINLOCK(call_lock);
-
-struct call_data_struct {
-        void (*func) (void *info);
-        void *info;
-        cpumask_t started;
-        cpumask_t finished;
-        int wait;
-};
-
-static struct call_data_struct *call_data;
-
-/*
- * 'Call function' interrupt callback
- */
-static void do_call_function(void)
-{
-        void (*func) (void *info) = call_data->func;
-        void *info = call_data->info;
-        int wait = call_data->wait;
-
-        cpu_set(smp_processor_id(), call_data->started);
-        (*func)(info);
-        if (wait)
-                cpu_set(smp_processor_id(), call_data->finished);;
-}
-
-static void __smp_call_function_map(void (*func) (void *info), void *info,
-                                    int wait, cpumask_t map)
-{
-        struct call_data_struct data;
-        int cpu, local = 0;
-
-        /*
-         * Can deadlock when interrupts are disabled or if in wrong context.
-         */
-        WARN_ON(irqs_disabled() || in_irq());
-
-        /*
-         * Check for local function call. We have to have the same call order
-         * as in on_each_cpu() because of machine_restart_smp().
-         */
-        if (cpu_isset(smp_processor_id(), map)) {
-                local = 1;
-                cpu_clear(smp_processor_id(), map);
-        }
-
-        cpus_and(map, map, cpu_online_map);
-        if (cpus_empty(map))
-                goto out;
-
-        data.func = func;
-        data.info = info;
-        data.started = CPU_MASK_NONE;
-        data.wait = wait;
-        if (wait)
-                data.finished = CPU_MASK_NONE;
-
-        call_data = &data;
-
-        for_each_cpu_mask(cpu, map)
-                smp_ext_bitcall(cpu, ec_call_function);
-
-        /* Wait for response */
-        while (!cpus_equal(map, data.started))
-                cpu_relax();
-        if (wait)
-                while (!cpus_equal(map, data.finished))
-                        cpu_relax();
-out:
-        if (local) {
-                local_irq_disable();
-                func(info);
-                local_irq_enable();
-        }
-}
-
-/*
- * smp_call_function:
- * @func: the function to run; this must be fast and non-blocking
- * @info: an arbitrary pointer to pass to the function
- * @wait: if true, wait (atomically) until function has completed on other CPUs
- *
- * Run a function on all other CPUs.
- *
- * You must not call this function with disabled interrupts, from a
- * hardware interrupt handler or from a bottom half.
- */
-int smp_call_function(void (*func) (void *info), void *info, int wait)
-{
-        cpumask_t map;
-
-        spin_lock(&call_lock);
-        map = cpu_online_map;
-        cpu_clear(smp_processor_id(), map);
-        __smp_call_function_map(func, info, wait, map);
-        spin_unlock(&call_lock);
-        return 0;
-}
-EXPORT_SYMBOL(smp_call_function);
-
-/*
- * smp_call_function_single:
- * @cpu: the CPU where func should run
- * @func: the function to run; this must be fast and non-blocking
- * @info: an arbitrary pointer to pass to the function
- * @wait: if true, wait (atomically) until function has completed on other CPUs
- *
- * Run a function on one processor.
- *
- * You must not call this function with disabled interrupts, from a
- * hardware interrupt handler or from a bottom half.
- */
-int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
-                             int wait)
-{
-        spin_lock(&call_lock);
-        __smp_call_function_map(func, info, wait, cpumask_of_cpu(cpu));
-        spin_unlock(&call_lock);
-        return 0;
-}
-EXPORT_SYMBOL(smp_call_function_single);
-
-/**
- * smp_call_function_mask(): Run a function on a set of other CPUs.
- * @mask: The set of cpus to run on.  Must not include the current cpu.
- * @func: The function to run. This must be fast and non-blocking.
- * @info: An arbitrary pointer to pass to the function.
- * @wait: If true, wait (atomically) until function has completed on other CPUs.
- *
- * Returns 0 on success, else a negative status code.
- *
- * If @wait is true, then returns once @func has returned; otherwise
- * it returns just before the target cpu calls @func.
- *
- * You must not call this function with disabled interrupts or from a
- * hardware interrupt handler or from a bottom half handler.
- */
-int smp_call_function_mask(cpumask_t mask, void (*func)(void *), void *info,
-                           int wait)
-{
-        spin_lock(&call_lock);
-        cpu_clear(smp_processor_id(), mask);
-        __smp_call_function_map(func, info, wait, mask);
-        spin_unlock(&call_lock);
-        return 0;
-}
-EXPORT_SYMBOL(smp_call_function_mask);
-
 void smp_send_stop(void)
 {
         int cpu, rc;
@@ -271,7 +118,10 @@ static void do_ext_call_interrupt(__u16 code)
         bits = xchg(&S390_lowcore.ext_call_fast, 0);
 
         if (test_bit(ec_call_function, &bits))
-                do_call_function();
+                generic_smp_call_function_interrupt();
+
+        if (test_bit(ec_call_function_single, &bits))
+                generic_smp_call_function_single_interrupt();
 }
 
 /*
@@ -288,6 +138,19 @@ static void smp_ext_bitcall(int cpu, ec_bit_sig sig)
                 udelay(10);
 }
 
+void arch_send_call_function_ipi(cpumask_t mask)
+{
+        int cpu;
+
+        for_each_cpu_mask(cpu, mask)
+                smp_ext_bitcall(cpu, ec_call_function);
+}
+
+void arch_send_call_function_single_ipi(int cpu)
+{
+        smp_ext_bitcall(cpu, ec_call_function_single);
+}
+
 #ifndef CONFIG_64BIT
 /*
  * this function sends a 'purge tlb' signal to another CPU.
@@ -588,9 +451,9 @@ int __cpuinit start_secondary(void *cpuvoid)
         /* call cpu notifiers */
         notify_cpu_starting(smp_processor_id());
         /* Mark this cpu as online */
-        spin_lock(&call_lock);
+        ipi_call_lock();
         cpu_set(smp_processor_id(), cpu_online_map);
-        spin_unlock(&call_lock);
+        ipi_call_unlock();
         /* Switch on interrupts */
         local_irq_enable();
         /* Print info about this processor */