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blackfin: smp: adapt to generic smp helpers 

Replace blackfin ipi message queue with generic smp helper function.

Signed-off-by: Steven Miao <realmz6@gmail.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
This commit is contained in:
Steven Miao 2012-07-31 17:28:10 +08:00 committed by Bob Liu
parent 0d7614f09c
commit 50888469bd
3 changed files with 66 additions and 154 deletions
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1
arch/blackfin/Kconfig
View File

@ -38,6 +38,7 @@ config BLACKFIN
select GENERIC_ATOMIC64
select GENERIC_IRQ_PROBE
select IRQ_PER_CPU if SMP
select USE_GENERIC_SMP_HELPERS if SMP
select HAVE_NMI_WATCHDOG if NMI_WATCHDOG
select GENERIC_SMP_IDLE_THREAD
select ARCH_USES_GETTIMEOFFSET if !GENERIC_CLOCKEVENTS

2
arch/blackfin/include/asm/smp.h
View File

@ -18,6 +18,8 @@
#define raw_smp_processor_id() blackfin_core_id()
extern void bfin_relocate_coreb_l1_mem(void);
extern void arch_send_call_function_single_ipi(int cpu);
extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
#if defined(CONFIG_SMP) && defined(CONFIG_ICACHE_FLUSH_L1)
asmlinkage void blackfin_icache_flush_range_l1(unsigned long *ptr);

195
arch/blackfin/mach-common/smp.c
View File

@ -48,10 +48,13 @@ unsigned long blackfin_iflush_l1_entry[NR_CPUS];
struct blackfin_initial_pda __cpuinitdata initial_pda_coreb;
#define BFIN_IPI_TIMER 0
#define BFIN_IPI_RESCHEDULE 1
#define BFIN_IPI_CALL_FUNC 2
#define BFIN_IPI_CPU_STOP 3
enum ipi_message_type {
BFIN_IPI_TIMER,
BFIN_IPI_RESCHEDULE,
BFIN_IPI_CALL_FUNC,
BFIN_IPI_CALL_FUNC_SINGLE,
BFIN_IPI_CPU_STOP,
};
struct blackfin_flush_data {
unsigned long start;
@ -60,35 +63,20 @@ struct blackfin_flush_data {
void *secondary_stack;
struct smp_call_struct {
void (*func)(void *info);
void *info;
int wait;
cpumask_t *waitmask;
};
static struct blackfin_flush_data smp_flush_data;
static DEFINE_SPINLOCK(stop_lock);
struct ipi_message {
unsigned long type;
struct smp_call_struct call_struct;
};
/* A magic number - stress test shows this is safe for common cases */
#define BFIN_IPI_MSGQ_LEN 5
/* Simple FIFO buffer, overflow leads to panic */
struct ipi_message_queue {
spinlock_t lock;
struct ipi_data {
unsigned long count;
unsigned long head; /* head of the queue */
struct ipi_message ipi_message[BFIN_IPI_MSGQ_LEN];
unsigned long bits;
};
static DEFINE_PER_CPU(struct ipi_message_queue, ipi_msg_queue);
static DEFINE_PER_CPU(struct ipi_data, bfin_ipi);
static void ipi_cpu_stop(unsigned int cpu)
{
@ -129,28 +117,6 @@ static void ipi_flush_icache(void *info)
blackfin_icache_flush_range(fdata->start, fdata->end);
}
static void ipi_call_function(unsigned int cpu, struct ipi_message *msg)
{
int wait;
void (*func)(void *info);
void *info;
func = msg->call_struct.func;
info = msg->call_struct.info;
wait = msg->call_struct.wait;
func(info);
if (wait) {
#ifdef __ARCH_SYNC_CORE_DCACHE
/*
* 'wait' usually means synchronization between CPUs.
* Invalidate D cache in case shared data was changed
* by func() to ensure cache coherence.
*/
resync_core_dcache();
#endif
cpumask_clear_cpu(cpu, msg->call_struct.waitmask);
}
}
/* Use IRQ_SUPPLE_0 to request reschedule.
* When returning from interrupt to user space,
* there is chance to reschedule */
@ -172,20 +138,20 @@ void ipi_timer(void)
static irqreturn_t ipi_handler_int1(int irq, void *dev_instance)
{
struct ipi_message *msg;
struct ipi_message_queue *msg_queue;
struct ipi_data *bfin_ipi_data;
unsigned int cpu = smp_processor_id();
unsigned long flags;
unsigned long pending;
unsigned long msg;
platform_clear_ipi(cpu, IRQ_SUPPLE_1);
msg_queue = &__get_cpu_var(ipi_msg_queue);
bfin_ipi_data = &__get_cpu_var(bfin_ipi);
spin_lock_irqsave(&msg_queue->lock, flags);
while (msg_queue->count) {
msg = &msg_queue->ipi_message[msg_queue->head];
switch (msg->type) {
while ((pending = xchg(&bfin_ipi_data->bits, 0)) != 0) {
msg = 0;
do {
msg = find_next_bit(&pending, BITS_PER_LONG, msg + 1);
switch (msg) {
case BFIN_IPI_TIMER:
ipi_timer();
break;
@ -193,131 +159,74 @@ static irqreturn_t ipi_handler_int1(int irq, void *dev_instance)
scheduler_ipi();
break;
case BFIN_IPI_CALL_FUNC:
ipi_call_function(cpu, msg);
generic_smp_call_function_interrupt();
break;
case BFIN_IPI_CALL_FUNC_SINGLE:
generic_smp_call_function_single_interrupt();
break;
case BFIN_IPI_CPU_STOP:
ipi_cpu_stop(cpu);
break;
default:
printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%lx\n",
cpu, msg->type);
break;
}
msg_queue->head++;
msg_queue->head %= BFIN_IPI_MSGQ_LEN;
msg_queue->count--;
} while (msg < BITS_PER_LONG);
smp_mb();
}
spin_unlock_irqrestore(&msg_queue->lock, flags);
return IRQ_HANDLED;
}
static void ipi_queue_init(void)
static void bfin_ipi_init(void)
{
unsigned int cpu;
struct ipi_message_queue *msg_queue;
struct ipi_data *bfin_ipi_data;
for_each_possible_cpu(cpu) {
msg_queue = &per_cpu(ipi_msg_queue, cpu);
spin_lock_init(&msg_queue->lock);
msg_queue->count = 0;
msg_queue->head = 0;
bfin_ipi_data = &per_cpu(bfin_ipi, cpu);
bfin_ipi_data->bits = 0;
bfin_ipi_data->count = 0;
}
}
static inline void smp_send_message(cpumask_t callmap, unsigned long type,
void (*func) (void *info), void *info, int wait)
void send_ipi(const struct cpumask *cpumask, enum ipi_message_type msg)
{
unsigned int cpu;
struct ipi_message_queue *msg_queue;
struct ipi_message *msg;
unsigned long flags, next_msg;
cpumask_t waitmask; /* waitmask is shared by all cpus */
struct ipi_data *bfin_ipi_data;
unsigned long flags;
cpumask_copy(&waitmask, &callmap);
for_each_cpu(cpu, &callmap) {
msg_queue = &per_cpu(ipi_msg_queue, cpu);
spin_lock_irqsave(&msg_queue->lock, flags);
if (msg_queue->count < BFIN_IPI_MSGQ_LEN) {
next_msg = (msg_queue->head + msg_queue->count)
% BFIN_IPI_MSGQ_LEN;
msg = &msg_queue->ipi_message[next_msg];
msg->type = type;
if (type == BFIN_IPI_CALL_FUNC) {
msg->call_struct.func = func;
msg->call_struct.info = info;
msg->call_struct.wait = wait;
msg->call_struct.waitmask = &waitmask;
}
msg_queue->count++;
} else
panic("IPI message queue overflow\n");
spin_unlock_irqrestore(&msg_queue->lock, flags);
local_irq_save(flags);
for_each_cpu(cpu, cpumask) {
bfin_ipi_data = &per_cpu(bfin_ipi, cpu);
smp_mb();
set_bit(msg, &bfin_ipi_data->bits);
bfin_ipi_data->count++;
platform_send_ipi_cpu(cpu, IRQ_SUPPLE_1);
}
if (wait) {
while (!cpumask_empty(&waitmask))
blackfin_dcache_invalidate_range(
(unsigned long)(&waitmask),
(unsigned long)(&waitmask));
#ifdef __ARCH_SYNC_CORE_DCACHE
/*
* Invalidate D cache in case shared data was changed by
* other processors to ensure cache coherence.
*/
resync_core_dcache();
#endif
}
local_irq_restore(flags);
}
int smp_call_function(void (*func)(void *info), void *info, int wait)
void arch_send_call_function_single_ipi(int cpu)
{
cpumask_t callmap;
preempt_disable();
cpumask_copy(&callmap, cpu_online_mask);
cpumask_clear_cpu(smp_processor_id(), &callmap);
if (!cpumask_empty(&callmap))
smp_send_message(callmap, BFIN_IPI_CALL_FUNC, func, info, wait);
preempt_enable();
return 0;
send_ipi(cpumask_of(cpu), BFIN_IPI_CALL_FUNC_SINGLE);
}
EXPORT_SYMBOL_GPL(smp_call_function);
int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
int wait)
void arch_send_call_function_ipi_mask(const struct cpumask *mask)
{
unsigned int cpu = cpuid;
cpumask_t callmap;
if (cpu_is_offline(cpu))
return 0;
cpumask_clear(&callmap);
cpumask_set_cpu(cpu, &callmap);
smp_send_message(callmap, BFIN_IPI_CALL_FUNC, func, info, wait);
return 0;
send_ipi(mask, BFIN_IPI_CALL_FUNC);
}
EXPORT_SYMBOL_GPL(smp_call_function_single);
void smp_send_reschedule(int cpu)
{
cpumask_t callmap;
/* simply trigger an ipi */
cpumask_clear(&callmap);
cpumask_set_cpu(cpu, &callmap);
smp_send_message(callmap, BFIN_IPI_RESCHEDULE, NULL, NULL, 0);
send_ipi(cpumask_of(cpu), BFIN_IPI_RESCHEDULE);
return;
}
void smp_send_msg(const struct cpumask *mask, unsigned long type)
{
smp_send_message(*mask, type, NULL, NULL, 0);
send_ipi(mask, type);
}
void smp_timer_broadcast(const struct cpumask *mask)
@ -333,7 +242,7 @@ void smp_send_stop(void)
cpumask_copy(&callmap, cpu_online_mask);
cpumask_clear_cpu(smp_processor_id(), &callmap);
if (!cpumask_empty(&callmap))
smp_send_message(callmap, BFIN_IPI_CPU_STOP, NULL, NULL, 0);
send_ipi(&callmap, BFIN_IPI_CPU_STOP);
preempt_enable();
@ -436,7 +345,7 @@ void __init smp_prepare_boot_cpu(void)
void __init smp_prepare_cpus(unsigned int max_cpus)
{
platform_prepare_cpus(max_cpus);
ipi_queue_init();
bfin_ipi_init();
platform_request_ipi(IRQ_SUPPLE_0, ipi_handler_int0);
platform_request_ipi(IRQ_SUPPLE_1, ipi_handler_int1);
}