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Subject[PATCH 3/5] x86-64: convert to generic helpers for IPI function calls
Date
This converts x86-64 to use the new helpers for smp_call_function() and
frieds, and adds support for smp_call_function_single().

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---
arch/x86/kernel/entry_64.S | 3 +
arch/x86/kernel/i8259_64.c | 1 +
arch/x86/kernel/smp_64.c | 175 ++++++++++---------------------------------
include/asm-x86/hw_irq_64.h | 4 +-
4 files changed, 46 insertions(+), 137 deletions(-)
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index c20c9e7..22caf56 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -713,6 +713,9 @@ END(invalidate_interrupt\num)
ENTRY(call_function_interrupt)
apicinterrupt CALL_FUNCTION_VECTOR,smp_call_function_interrupt
END(call_function_interrupt)
+ENTRY(call_function_single_interrupt)
+ apicinterrupt CALL_FUNCTION_SINGLE_VECTOR,smp_call_function_single_interrupt
+END(call_function_single_interrupt)
ENTRY(irq_move_cleanup_interrupt)
apicinterrupt IRQ_MOVE_CLEANUP_VECTOR,smp_irq_move_cleanup_interrupt
END(irq_move_cleanup_interrupt)
diff --git a/arch/x86/kernel/i8259_64.c b/arch/x86/kernel/i8259_64.c
index fa57a15..2b0b6d2 100644
--- a/arch/x86/kernel/i8259_64.c
+++ b/arch/x86/kernel/i8259_64.c
@@ -493,6 +493,7 @@ void __init native_init_IRQ(void)

/* IPI for generic function call */
set_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
+ set_intr_gate(CALL_FUNCTION_SINGLE_VECTOR, call_function_single_interrupt);

/* Low priority IPI to cleanup after moving an irq */
set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
diff --git a/arch/x86/kernel/smp_64.c b/arch/x86/kernel/smp_64.c
index 2fd74b0..6002274 100644
--- a/arch/x86/kernel/smp_64.c
+++ b/arch/x86/kernel/smp_64.c
@@ -295,111 +295,27 @@ void smp_send_reschedule(int cpu)
send_IPI_mask(cpumask_of_cpu(cpu), RESCHEDULE_VECTOR);
}

-/*
- * Structure and data for smp_call_function(). 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;
- atomic_t started;
- atomic_t finished;
- int wait;
-};
-
-static struct call_data_struct * call_data;
-
void lock_ipi_call_lock(void)
{
- spin_lock_irq(&call_lock);
+ spin_lock_irq(&call_function_lock);
}

void unlock_ipi_call_lock(void)
{
- spin_unlock_irq(&call_lock);
+ spin_unlock_irq(&call_function_lock);
}

-/*
- * this function sends a 'generic call function' IPI to all other CPU
- * of the system defined in the mask.
- */
-static int __smp_call_function_mask(cpumask_t mask,
- void (*func)(void *), void *info,
- int wait)
+static void send_cfs_ipi(int cpu)
{
- struct call_data_struct data;
- cpumask_t allbutself;
- int cpus;
-
- allbutself = cpu_online_map;
- cpu_clear(smp_processor_id(), allbutself);
-
- cpus_and(mask, mask, allbutself);
- cpus = cpus_weight(mask);
-
- if (!cpus)
- return 0;
-
- data.func = func;
- data.info = info;
- atomic_set(&data.started, 0);
- data.wait = wait;
- if (wait)
- atomic_set(&data.finished, 0);
-
- call_data = &data;
- wmb();
-
- /* Send a message to other CPUs */
- if (cpus_equal(mask, allbutself))
- send_IPI_allbutself(CALL_FUNCTION_VECTOR);
- else
- send_IPI_mask(mask, CALL_FUNCTION_VECTOR);
-
- /* Wait for response */
- while (atomic_read(&data.started) != cpus)
- cpu_relax();
+ cpumask_t mask = cpumask_of_cpu(cpu);

- if (!wait)
- return 0;
-
- while (atomic_read(&data.finished) != cpus)
- cpu_relax();
-
- return 0;
+ send_IPI_mask(mask, CALL_FUNCTION_SINGLE_VECTOR);
}
-/**
- * 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)
-{
- int ret;
-
- /* Can deadlock when called with interrupts disabled */
- WARN_ON(irqs_disabled());

- spin_lock(&call_lock);
- ret = __smp_call_function_mask(mask, func, info, wait);
- spin_unlock(&call_lock);
- return ret;
+void __smp_call_function_single(int cpu, struct call_single_data *data)
+{
+ generic_exec_single(cpu, data, send_cfs_ipi);
}
-EXPORT_SYMBOL(smp_call_function_mask);

/*
* smp_call_function_single - Run a function on a specific CPU
@@ -413,30 +329,26 @@ EXPORT_SYMBOL(smp_call_function_mask);
* Does not return until the remote CPU is nearly ready to execute <func>
* or is or has executed.
*/
-
-int smp_call_function_single (int cpu, void (*func) (void *info), void *info,
+int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
int nonatomic, int wait)
{
- /* prevent preemption and reschedule on another processor */
- int ret, me = get_cpu();
-
- /* Can deadlock when called with interrupts disabled */
- WARN_ON(irqs_disabled());
-
- if (cpu == me) {
- local_irq_disable();
- func(info);
- local_irq_enable();
- put_cpu();
- return 0;
- }
+ return generic_smp_call_function_single(cpu, func, info, wait,
+ send_cfs_ipi);
+}
+EXPORT_SYMBOL(smp_call_function_single);

- ret = smp_call_function_mask(cpumask_of_cpu(cpu), func, info, wait);
+static void send_call_function_ipi(cpumask_t mask)
+{
+ cpumask_t allbutself;

- put_cpu();
- return ret;
+ allbutself = cpu_online_map;
+ cpu_clear(smp_processor_id(), allbutself);
+
+ if (cpus_equal(mask, allbutself))
+ send_IPI_allbutself(CALL_FUNCTION_VECTOR);
+ else
+ send_IPI_mask(mask, CALL_FUNCTION_VECTOR);
}
-EXPORT_SYMBOL(smp_call_function_single);

/*
* smp_call_function - run a function on all other CPUs.
@@ -456,7 +368,8 @@ EXPORT_SYMBOL(smp_call_function_single);
int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
int wait)
{
- return smp_call_function_mask(cpu_online_map, func, info, wait);
+ return generic_smp_call_function(func, info, wait, cpu_online_map,
+ send_call_function_ipi);
}
EXPORT_SYMBOL(smp_call_function);

@@ -474,18 +387,13 @@ static void stop_this_cpu(void *dummy)

void smp_send_stop(void)
{
- int nolock;
unsigned long flags;

if (reboot_force)
return;

- /* Don't deadlock on the call lock in panic */
- nolock = !spin_trylock(&call_lock);
local_irq_save(flags);
- __smp_call_function_mask(cpu_online_map, stop_this_cpu, NULL, 0);
- if (!nolock)
- spin_unlock(&call_lock);
+ smp_call_function(stop_this_cpu, NULL, 0, 0);
disable_local_APIC();
local_irq_restore(flags);
}
@@ -503,28 +411,25 @@ asmlinkage void smp_reschedule_interrupt(void)

asmlinkage void smp_call_function_interrupt(void)
{
- void (*func) (void *info) = call_data->func;
- void *info = call_data->info;
- int wait = call_data->wait;
+ ack_APIC_irq();
+ exit_idle();
+ irq_enter();
+
+ generic_smp_call_function_interrupt();
+
+ add_pda(irq_call_count, 1);
+ irq_exit();
+}

+asmlinkage void smp_call_function_single_interrupt(void)
+{
ack_APIC_irq();
- /*
- * Notify initiating CPU that I've grabbed the data and am
- * about to execute the function
- */
- mb();
- atomic_inc(&call_data->started);
- /*
- * At this point the info structure may be out of scope unless wait==1
- */
exit_idle();
irq_enter();
- (*func)(info);
+
+ generic_smp_call_function_single_interrupt();
+
add_pda(irq_call_count, 1);
irq_exit();
- if (wait) {
- mb();
- atomic_inc(&call_data->finished);
- }
}

diff --git a/include/asm-x86/hw_irq_64.h b/include/asm-x86/hw_irq_64.h
index 312a58d..06ac80c 100644
--- a/include/asm-x86/hw_irq_64.h
+++ b/include/asm-x86/hw_irq_64.h
@@ -68,8 +68,7 @@
#define ERROR_APIC_VECTOR 0xfe
#define RESCHEDULE_VECTOR 0xfd
#define CALL_FUNCTION_VECTOR 0xfc
-/* fb free - please don't readd KDB here because it's useless
- (hint - think what a NMI bit does to a vector) */
+#define CALL_FUNCTION_SINGLE_VECTOR 0xfb
#define THERMAL_APIC_VECTOR 0xfa
#define THRESHOLD_APIC_VECTOR 0xf9
/* f8 free */
@@ -102,6 +101,7 @@ void spurious_interrupt(void);
void error_interrupt(void);
void reschedule_interrupt(void);
void call_function_interrupt(void);
+void call_function_single_interrupt(void);
void irq_move_cleanup_interrupt(void);
void invalidate_interrupt0(void);
void invalidate_interrupt1(void);
--
1.5.4.GIT


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