forked from Minki/linux
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
Bob Liu
parent
0d7614f09c
commit
50888469bd
@ -38,6 +38,7 @@ config BLACKFIN
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select GENERIC_ATOMIC64
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select GENERIC_IRQ_PROBE
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select IRQ_PER_CPU if SMP
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select USE_GENERIC_SMP_HELPERS if SMP
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select HAVE_NMI_WATCHDOG if NMI_WATCHDOG
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select GENERIC_SMP_IDLE_THREAD
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select ARCH_USES_GETTIMEOFFSET if !GENERIC_CLOCKEVENTS
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@ -18,6 +18,8 @@
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#define raw_smp_processor_id() blackfin_core_id()
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extern void bfin_relocate_coreb_l1_mem(void);
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extern void arch_send_call_function_single_ipi(int cpu);
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extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
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#if defined(CONFIG_SMP) && defined(CONFIG_ICACHE_FLUSH_L1)
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asmlinkage void blackfin_icache_flush_range_l1(unsigned long *ptr);
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@ -48,10 +48,13 @@ unsigned long blackfin_iflush_l1_entry[NR_CPUS];
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struct blackfin_initial_pda __cpuinitdata initial_pda_coreb;
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#define BFIN_IPI_TIMER 0
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#define BFIN_IPI_RESCHEDULE 1
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#define BFIN_IPI_CALL_FUNC 2
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#define BFIN_IPI_CPU_STOP 3
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enum ipi_message_type {
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BFIN_IPI_TIMER,
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BFIN_IPI_RESCHEDULE,
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BFIN_IPI_CALL_FUNC,
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BFIN_IPI_CALL_FUNC_SINGLE,
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BFIN_IPI_CPU_STOP,
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};
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struct blackfin_flush_data {
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unsigned long start;
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@ -60,35 +63,20 @@ struct blackfin_flush_data {
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void *secondary_stack;
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struct smp_call_struct {
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void (*func)(void *info);
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void *info;
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int wait;
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cpumask_t *waitmask;
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};
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static struct blackfin_flush_data smp_flush_data;
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static DEFINE_SPINLOCK(stop_lock);
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struct ipi_message {
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unsigned long type;
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struct smp_call_struct call_struct;
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};
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/* A magic number - stress test shows this is safe for common cases */
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#define BFIN_IPI_MSGQ_LEN 5
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/* Simple FIFO buffer, overflow leads to panic */
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struct ipi_message_queue {
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spinlock_t lock;
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struct ipi_data {
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unsigned long count;
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unsigned long head; /* head of the queue */
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struct ipi_message ipi_message[BFIN_IPI_MSGQ_LEN];
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unsigned long bits;
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};
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static DEFINE_PER_CPU(struct ipi_message_queue, ipi_msg_queue);
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static DEFINE_PER_CPU(struct ipi_data, bfin_ipi);
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static void ipi_cpu_stop(unsigned int cpu)
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{
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@ -129,28 +117,6 @@ static void ipi_flush_icache(void *info)
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blackfin_icache_flush_range(fdata->start, fdata->end);
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}
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static void ipi_call_function(unsigned int cpu, struct ipi_message *msg)
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{
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int wait;
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void (*func)(void *info);
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void *info;
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func = msg->call_struct.func;
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info = msg->call_struct.info;
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wait = msg->call_struct.wait;
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func(info);
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if (wait) {
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#ifdef __ARCH_SYNC_CORE_DCACHE
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/*
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* 'wait' usually means synchronization between CPUs.
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* Invalidate D cache in case shared data was changed
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* by func() to ensure cache coherence.
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*/
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resync_core_dcache();
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#endif
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cpumask_clear_cpu(cpu, msg->call_struct.waitmask);
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}
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}
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/* Use IRQ_SUPPLE_0 to request reschedule.
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* When returning from interrupt to user space,
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* there is chance to reschedule */
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@ -172,152 +138,95 @@ void ipi_timer(void)
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static irqreturn_t ipi_handler_int1(int irq, void *dev_instance)
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{
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struct ipi_message *msg;
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struct ipi_message_queue *msg_queue;
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struct ipi_data *bfin_ipi_data;
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unsigned int cpu = smp_processor_id();
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unsigned long flags;
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unsigned long pending;
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unsigned long msg;
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platform_clear_ipi(cpu, IRQ_SUPPLE_1);
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msg_queue = &__get_cpu_var(ipi_msg_queue);
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bfin_ipi_data = &__get_cpu_var(bfin_ipi);
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spin_lock_irqsave(&msg_queue->lock, flags);
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while ((pending = xchg(&bfin_ipi_data->bits, 0)) != 0) {
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msg = 0;
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do {
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msg = find_next_bit(&pending, BITS_PER_LONG, msg + 1);
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switch (msg) {
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case BFIN_IPI_TIMER:
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ipi_timer();
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break;
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case BFIN_IPI_RESCHEDULE:
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scheduler_ipi();
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break;
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case BFIN_IPI_CALL_FUNC:
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generic_smp_call_function_interrupt();
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break;
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while (msg_queue->count) {
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msg = &msg_queue->ipi_message[msg_queue->head];
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switch (msg->type) {
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case BFIN_IPI_TIMER:
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ipi_timer();
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break;
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case BFIN_IPI_RESCHEDULE:
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scheduler_ipi();
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break;
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case BFIN_IPI_CALL_FUNC:
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ipi_call_function(cpu, msg);
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break;
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case BFIN_IPI_CPU_STOP:
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ipi_cpu_stop(cpu);
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break;
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default:
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printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%lx\n",
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cpu, msg->type);
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break;
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}
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msg_queue->head++;
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msg_queue->head %= BFIN_IPI_MSGQ_LEN;
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msg_queue->count--;
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case BFIN_IPI_CALL_FUNC_SINGLE:
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generic_smp_call_function_single_interrupt();
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break;
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case BFIN_IPI_CPU_STOP:
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ipi_cpu_stop(cpu);
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break;
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}
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} while (msg < BITS_PER_LONG);
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smp_mb();
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}
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spin_unlock_irqrestore(&msg_queue->lock, flags);
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return IRQ_HANDLED;
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}
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static void ipi_queue_init(void)
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static void bfin_ipi_init(void)
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{
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unsigned int cpu;
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struct ipi_message_queue *msg_queue;
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struct ipi_data *bfin_ipi_data;
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for_each_possible_cpu(cpu) {
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msg_queue = &per_cpu(ipi_msg_queue, cpu);
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spin_lock_init(&msg_queue->lock);
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msg_queue->count = 0;
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msg_queue->head = 0;
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bfin_ipi_data = &per_cpu(bfin_ipi, cpu);
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bfin_ipi_data->bits = 0;
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bfin_ipi_data->count = 0;
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}
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}
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static inline void smp_send_message(cpumask_t callmap, unsigned long type,
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void (*func) (void *info), void *info, int wait)
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void send_ipi(const struct cpumask *cpumask, enum ipi_message_type msg)
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{
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unsigned int cpu;
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struct ipi_message_queue *msg_queue;
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struct ipi_message *msg;
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unsigned long flags, next_msg;
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cpumask_t waitmask; /* waitmask is shared by all cpus */
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struct ipi_data *bfin_ipi_data;
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unsigned long flags;
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cpumask_copy(&waitmask, &callmap);
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for_each_cpu(cpu, &callmap) {
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msg_queue = &per_cpu(ipi_msg_queue, cpu);
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spin_lock_irqsave(&msg_queue->lock, flags);
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if (msg_queue->count < BFIN_IPI_MSGQ_LEN) {
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next_msg = (msg_queue->head + msg_queue->count)
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% BFIN_IPI_MSGQ_LEN;
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msg = &msg_queue->ipi_message[next_msg];
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msg->type = type;
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if (type == BFIN_IPI_CALL_FUNC) {
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msg->call_struct.func = func;
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msg->call_struct.info = info;
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msg->call_struct.wait = wait;
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msg->call_struct.waitmask = &waitmask;
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}
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msg_queue->count++;
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} else
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panic("IPI message queue overflow\n");
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spin_unlock_irqrestore(&msg_queue->lock, flags);
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local_irq_save(flags);
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for_each_cpu(cpu, cpumask) {
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bfin_ipi_data = &per_cpu(bfin_ipi, cpu);
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smp_mb();
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set_bit(msg, &bfin_ipi_data->bits);
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bfin_ipi_data->count++;
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platform_send_ipi_cpu(cpu, IRQ_SUPPLE_1);
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}
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if (wait) {
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while (!cpumask_empty(&waitmask))
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blackfin_dcache_invalidate_range(
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(unsigned long)(&waitmask),
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(unsigned long)(&waitmask));
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#ifdef __ARCH_SYNC_CORE_DCACHE
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/*
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* Invalidate D cache in case shared data was changed by
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* other processors to ensure cache coherence.
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*/
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resync_core_dcache();
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#endif
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}
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local_irq_restore(flags);
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}
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int smp_call_function(void (*func)(void *info), void *info, int wait)
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void arch_send_call_function_single_ipi(int cpu)
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{
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cpumask_t callmap;
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preempt_disable();
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cpumask_copy(&callmap, cpu_online_mask);
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cpumask_clear_cpu(smp_processor_id(), &callmap);
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if (!cpumask_empty(&callmap))
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smp_send_message(callmap, BFIN_IPI_CALL_FUNC, func, info, wait);
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preempt_enable();
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return 0;
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send_ipi(cpumask_of(cpu), BFIN_IPI_CALL_FUNC_SINGLE);
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}
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EXPORT_SYMBOL_GPL(smp_call_function);
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int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
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int wait)
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void arch_send_call_function_ipi_mask(const struct cpumask *mask)
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{
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unsigned int cpu = cpuid;
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cpumask_t callmap;
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if (cpu_is_offline(cpu))
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return 0;
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cpumask_clear(&callmap);
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cpumask_set_cpu(cpu, &callmap);
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smp_send_message(callmap, BFIN_IPI_CALL_FUNC, func, info, wait);
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return 0;
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send_ipi(mask, BFIN_IPI_CALL_FUNC);
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}
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EXPORT_SYMBOL_GPL(smp_call_function_single);
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void smp_send_reschedule(int cpu)
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{
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cpumask_t callmap;
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/* simply trigger an ipi */
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cpumask_clear(&callmap);
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cpumask_set_cpu(cpu, &callmap);
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smp_send_message(callmap, BFIN_IPI_RESCHEDULE, NULL, NULL, 0);
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send_ipi(cpumask_of(cpu), BFIN_IPI_RESCHEDULE);
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return;
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}
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void smp_send_msg(const struct cpumask *mask, unsigned long type)
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{
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smp_send_message(*mask, type, NULL, NULL, 0);
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send_ipi(mask, type);
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}
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void smp_timer_broadcast(const struct cpumask *mask)
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@ -333,7 +242,7 @@ void smp_send_stop(void)
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cpumask_copy(&callmap, cpu_online_mask);
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cpumask_clear_cpu(smp_processor_id(), &callmap);
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if (!cpumask_empty(&callmap))
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smp_send_message(callmap, BFIN_IPI_CPU_STOP, NULL, NULL, 0);
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send_ipi(&callmap, BFIN_IPI_CPU_STOP);
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preempt_enable();
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@ -436,7 +345,7 @@ void __init smp_prepare_boot_cpu(void)
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void __init smp_prepare_cpus(unsigned int max_cpus)
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{
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platform_prepare_cpus(max_cpus);
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ipi_queue_init();
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bfin_ipi_init();
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platform_request_ipi(IRQ_SUPPLE_0, ipi_handler_int0);
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platform_request_ipi(IRQ_SUPPLE_1, ipi_handler_int1);
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}
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