** Lots of stuff stolen from arch/alpha/kernel/smp.c
** ...and then parisc stole from arch/ia64/kernel/smp.c. Thanks David! :^)
**
-** Thanks to John Curry and Ullas Ponnadi. I learned alot from their work.
+** Thanks to John Curry and Ullas Ponnadi. I learned a lot from their work.
** -grant (1/12/2001)
**
** This program is free software; you can redistribute it and/or modify
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
*/
-#undef ENTRY_SYS_CPUS /* syscall support for iCOD-like functionality */
-
-
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/kernel_stat.h>
#include <linux/mm.h>
+#include <linux/err.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <asm/unistd.h>
#include <asm/cacheflush.h>
-#define kDEBUG 0
+#undef DEBUG_SMP
+#ifdef DEBUG_SMP
+static int smp_debug_lvl = 0;
+#define smp_debug(lvl, printargs...) \
+ if (lvl >= smp_debug_lvl) \
+ printk(printargs);
+#else
+#define smp_debug(lvl, ...)
+#endif /* DEBUG_SMP */
DEFINE_SPINLOCK(smp_lock);
EXPORT_SYMBOL(cpu_online_map);
EXPORT_SYMBOL(cpu_possible_map);
-
-struct smp_call_struct {
- void (*func) (void *info);
- void *info;
- long wait;
- atomic_t unstarted_count;
- atomic_t unfinished_count;
-};
-static volatile struct smp_call_struct *smp_call_function_data;
+DEFINE_PER_CPU(spinlock_t, ipi_lock) = SPIN_LOCK_UNLOCKED;
enum ipi_message_type {
IPI_NOP=0,
IPI_RESCHEDULE=1,
IPI_CALL_FUNC,
+ IPI_CALL_FUNC_SINGLE,
IPI_CPU_START,
IPI_CPU_STOP,
IPI_CPU_TEST
static void
ipi_init(int cpuid)
{
-
- /* If CPU is present ... */
-#ifdef ENTRY_SYS_CPUS
- /* *and* running (not stopped) ... */
-#error iCOD support wants state checked here.
-#endif
-
#error verify IRQ_OFFSET(IPI_IRQ) is ipi_interrupt() in new IRQ region
if(cpu_online(cpuid) )
static void
halt_processor(void)
{
-#ifdef ENTRY_SYS_CPUS
-#error halt_processor() needs rework
-/*
-** o migrate I/O interrupts off this CPU.
-** o leave IPI enabled - __cli() will disable IPI.
-** o leave CPU in online map - just change the state
-*/
- cpu_data[this_cpu].state = STATE_STOPPED;
- mark_bh(IPI_BH);
-#else
/* REVISIT : redirect I/O Interrupts to another CPU? */
/* REVISIT : does PM *know* this CPU isn't available? */
cpu_clear(smp_processor_id(), cpu_online_map);
local_irq_disable();
for (;;)
;
-#endif
}
mb(); /* Order interrupt and bit testing. */
for (;;) {
- spin_lock_irqsave(&(p->lock),flags);
+ spinlock_t *lock = &per_cpu(ipi_lock, this_cpu);
+ spin_lock_irqsave(lock, flags);
ops = p->pending_ipi;
p->pending_ipi = 0;
- spin_unlock_irqrestore(&(p->lock),flags);
+ spin_unlock_irqrestore(lock, flags);
mb(); /* Order bit clearing and data access. */
switch (which) {
case IPI_NOP:
-#if (kDEBUG>=100)
- printk(KERN_DEBUG "CPU%d IPI_NOP\n",this_cpu);
-#endif /* kDEBUG */
+ smp_debug(100, KERN_DEBUG "CPU%d IPI_NOP\n", this_cpu);
break;
case IPI_RESCHEDULE:
-#if (kDEBUG>=100)
- printk(KERN_DEBUG "CPU%d IPI_RESCHEDULE\n",this_cpu);
-#endif /* kDEBUG */
+ smp_debug(100, KERN_DEBUG "CPU%d IPI_RESCHEDULE\n", this_cpu);
/*
* Reschedule callback. Everything to be
* done is done by the interrupt return path.
break;
case IPI_CALL_FUNC:
-#if (kDEBUG>=100)
- printk(KERN_DEBUG "CPU%d IPI_CALL_FUNC\n",this_cpu);
-#endif /* kDEBUG */
- {
- volatile struct smp_call_struct *data;
- void (*func)(void *info);
- void *info;
- int wait;
-
- data = smp_call_function_data;
- func = data->func;
- info = data->info;
- wait = data->wait;
-
- mb();
- atomic_dec ((atomic_t *)&data->unstarted_count);
-
- /* At this point, *data can't
- * be relied upon.
- */
-
- (*func)(info);
-
- /* Notify the sending CPU that the
- * task is done.
- */
- mb();
- if (wait)
- atomic_dec ((atomic_t *)&data->unfinished_count);
- }
+ smp_debug(100, KERN_DEBUG "CPU%d IPI_CALL_FUNC\n", this_cpu);
+ generic_smp_call_function_interrupt();
+ break;
+
+ case IPI_CALL_FUNC_SINGLE:
+ smp_debug(100, KERN_DEBUG "CPU%d IPI_CALL_FUNC_SINGLE\n", this_cpu);
+ generic_smp_call_function_single_interrupt();
break;
case IPI_CPU_START:
-#if (kDEBUG>=100)
- printk(KERN_DEBUG "CPU%d IPI_CPU_START\n",this_cpu);
-#endif /* kDEBUG */
-#ifdef ENTRY_SYS_CPUS
- p->state = STATE_RUNNING;
-#endif
+ smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_START\n", this_cpu);
break;
case IPI_CPU_STOP:
-#if (kDEBUG>=100)
- printk(KERN_DEBUG "CPU%d IPI_CPU_STOP\n",this_cpu);
-#endif /* kDEBUG */
-#ifdef ENTRY_SYS_CPUS
-#else
+ smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_STOP\n", this_cpu);
halt_processor();
-#endif
break;
case IPI_CPU_TEST:
-#if (kDEBUG>=100)
- printk(KERN_DEBUG "CPU%d is alive!\n",this_cpu);
-#endif /* kDEBUG */
+ smp_debug(100, KERN_DEBUG "CPU%d is alive!\n", this_cpu);
break;
default:
ipi_send(int cpu, enum ipi_message_type op)
{
struct cpuinfo_parisc *p = &cpu_data[cpu];
+ spinlock_t *lock = &per_cpu(ipi_lock, cpu);
unsigned long flags;
- spin_lock_irqsave(&(p->lock),flags);
+ spin_lock_irqsave(lock, flags);
p->pending_ipi |= 1 << op;
gsc_writel(IPI_IRQ - CPU_IRQ_BASE, cpu_data[cpu].hpa);
- spin_unlock_irqrestore(&(p->lock),flags);
+ spin_unlock_irqrestore(lock, flags);
}
+static void
+send_IPI_mask(cpumask_t mask, enum ipi_message_type op)
+{
+ int cpu;
+
+ for_each_cpu_mask(cpu, mask)
+ ipi_send(cpu, op);
+}
static inline void
send_IPI_single(int dest_cpu, enum ipi_message_type op)
send_IPI_allbutself(IPI_NOP);
}
-
-/**
- * Run a function on all other CPUs.
- * <func> The function to run. This must be fast and non-blocking.
- * <info> An arbitrary pointer to pass to the function.
- * <retry> If true, keep retrying until ready.
- * <wait> If true, wait until function has completed on other CPUs.
- * [RETURNS] 0 on success, else a negative status code.
- *
- * Does not return until remote CPUs are nearly ready to execute <func>
- * or have executed.
- */
-
-int
-smp_call_function (void (*func) (void *info), void *info, int retry, int wait)
+void arch_send_call_function_ipi(cpumask_t mask)
{
- struct smp_call_struct data;
- unsigned long timeout;
- static DEFINE_SPINLOCK(lock);
- int retries = 0;
-
- if (num_online_cpus() < 2)
- return 0;
-
- /* Can deadlock when called with interrupts disabled */
- WARN_ON(irqs_disabled());
-
- /* can also deadlock if IPIs are disabled */
- WARN_ON((get_eiem() & (1UL<<(CPU_IRQ_MAX - IPI_IRQ))) == 0);
-
-
- data.func = func;
- data.info = info;
- data.wait = wait;
- atomic_set(&data.unstarted_count, num_online_cpus() - 1);
- atomic_set(&data.unfinished_count, num_online_cpus() - 1);
-
- if (retry) {
- spin_lock (&lock);
- while (smp_call_function_data != 0)
- barrier();
- }
- else {
- spin_lock (&lock);
- if (smp_call_function_data) {
- spin_unlock (&lock);
- return -EBUSY;
- }
- }
-
- smp_call_function_data = &data;
- spin_unlock (&lock);
-
- /* Send a message to all other CPUs and wait for them to respond */
- send_IPI_allbutself(IPI_CALL_FUNC);
-
- retry:
- /* Wait for response */
- timeout = jiffies + HZ;
- while ( (atomic_read (&data.unstarted_count) > 0) &&
- time_before (jiffies, timeout) )
- barrier ();
-
- if (atomic_read (&data.unstarted_count) > 0) {
- printk(KERN_CRIT "SMP CALL FUNCTION TIMED OUT! (cpu=%d), try %d\n",
- smp_processor_id(), ++retries);
- goto retry;
- }
- /* We either got one or timed out. Release the lock */
-
- mb();
- smp_call_function_data = NULL;
-
- while (wait && atomic_read (&data.unfinished_count) > 0)
- barrier ();
-
- return 0;
+ send_IPI_mask(mask, IPI_CALL_FUNC);
}
-EXPORT_SYMBOL(smp_call_function);
+void arch_send_call_function_single_ipi(int cpu)
+{
+ send_IPI_single(cpu, IPI_CALL_FUNC_SINGLE);
+}
/*
* Flush all other CPU's tlb and then mine. Do this with on_each_cpu()
BUG();
enter_lazy_tlb(&init_mm, current);
- init_IRQ(); /* make sure no IRQ's are enabled or pending */
+ init_IRQ(); /* make sure no IRQs are enabled or pending */
start_cpu_itimer();
}
void __init smp_callin(void)
{
int slave_id = cpu_now_booting;
-#if 0
- void *istack;
-#endif
smp_cpu_init(slave_id);
preempt_disable();
-#if 0 /* NOT WORKING YET - see entry.S */
- istack = (void *)__get_free_pages(GFP_KERNEL,ISTACK_ORDER);
- if (istack == NULL) {
- printk(KERN_CRIT "Failed to allocate interrupt stack for cpu %d\n",slave_id);
- BUG();
- }
- mtctl(istack,31);
-#endif
-
flush_cache_all_local(); /* start with known state */
flush_tlb_all_local(NULL);
/*
* Bring one cpu online.
*/
-int __init smp_boot_one_cpu(int cpuid)
+int __cpuinit smp_boot_one_cpu(int cpuid)
{
struct task_struct *idle;
long timeout;
alive:
/* Remember the Slave data */
-#if (kDEBUG>=100)
- printk(KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n",
+ smp_debug(100, KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n",
cpuid, timeout * 100);
-#endif /* kDEBUG */
-#ifdef ENTRY_SYS_CPUS
- cpu_data[cpuid].state = STATE_RUNNING;
-#endif
return 0;
}
{
int bootstrap_processor=cpu_data[0].cpuid; /* CPU ID of BSP */
-#ifdef ENTRY_SYS_CPUS
- cpu_data[0].state = STATE_RUNNING;
-#endif
-
/* Setup BSP mappings */
printk("SMP: bootstrap CPU ID is %d\n",bootstrap_processor);
/*
** inventory.c:do_inventory() hasn't yet been run and thus we
-** don't 'discover' the additional CPU's until later.
+** don't 'discover' the additional CPUs until later.
*/
void __init smp_prepare_cpus(unsigned int max_cpus)
{
return cpu_online(cpu) ? 0 : -ENOSYS;
}
-
-
-#ifdef ENTRY_SYS_CPUS
-/* Code goes along with:
-** entry.s: ENTRY_NAME(sys_cpus) / * 215, for cpu stat * /
-*/
-int sys_cpus(int argc, char **argv)
-{
- int i,j=0;
- extern int current_pid(int cpu);
-
- if( argc > 2 ) {
- printk("sys_cpus:Only one argument supported\n");
- return (-1);
- }
- if ( argc == 1 ){
-
-#ifdef DUMP_MORE_STATE
- for_each_online_cpu(i) {
- int cpus_per_line = 4;
-
- if (j++ % cpus_per_line)
- printk(" %3d",i);
- else
- printk("\n %3d",i);
- }
- printk("\n");
-#else
- printk("\n 0\n");
-#endif
- } else if((argc==2) && !(strcmp(argv[1],"-l"))) {
- printk("\nCPUSTATE TASK CPUNUM CPUID HARDCPU(HPA)\n");
-#ifdef DUMP_MORE_STATE
- for_each_online_cpu(i) {
- if (cpu_data[i].cpuid != NO_PROC_ID) {
- switch(cpu_data[i].state) {
- case STATE_RENDEZVOUS:
- printk("RENDEZVS ");
- break;
- case STATE_RUNNING:
- printk((current_pid(i)!=0) ? "RUNNING " : "IDLING ");
- break;
- case STATE_STOPPED:
- printk("STOPPED ");
- break;
- case STATE_HALTED:
- printk("HALTED ");
- break;
- default:
- printk("%08x?", cpu_data[i].state);
- break;
- }
- if(cpu_online(i)) {
- printk(" %4d",current_pid(i));
- }
- printk(" %6d",cpu_number_map(i));
- printk(" %5d",i);
- printk(" 0x%lx\n",cpu_data[i].hpa);
- }
- }
-#else
- printk("\n%s %4d 0 0 --------",
- (current->pid)?"RUNNING ": "IDLING ",current->pid);
-#endif
- } else if ((argc==2) && !(strcmp(argv[1],"-s"))) {
-#ifdef DUMP_MORE_STATE
- printk("\nCPUSTATE CPUID\n");
- for_each_online_cpu(i) {
- if (cpu_data[i].cpuid != NO_PROC_ID) {
- switch(cpu_data[i].state) {
- case STATE_RENDEZVOUS:
- printk("RENDEZVS");break;
- case STATE_RUNNING:
- printk((current_pid(i)!=0) ? "RUNNING " : "IDLING");
- break;
- case STATE_STOPPED:
- printk("STOPPED ");break;
- case STATE_HALTED:
- printk("HALTED ");break;
- default:
- }
- printk(" %5d\n",i);
- }
- }
-#else
- printk("\n%s CPU0",(current->pid==0)?"RUNNING ":"IDLING ");
-#endif
- } else {
- printk("sys_cpus:Unknown request\n");
- return (-1);
- }
- return 0;
-}
-#endif /* ENTRY_SYS_CPUS */
-
#ifdef CONFIG_PROC_FS
int __init
setup_profiling_timer(unsigned int multiplier)
projects / linux-2.6-omap-h63xx.git / blobdiff