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Diffstat (limited to 'arch/parisc/kernel/smp.c')
-rw-r--r--arch/parisc/kernel/smp.c255
1 files changed, 54 insertions, 201 deletions
diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index 85fc7754ec2..ceda229ea6c 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -18,7 +18,6 @@
*/
#include <linux/types.h>
#include <linux/spinlock.h>
-#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -31,9 +30,10 @@
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/bitops.h>
+#include <linux/ftrace.h>
+#include <linux/cpu.h>
-#include <asm/system.h>
-#include <asm/atomic.h>
+#include <linux/atomic.h>
#include <asm/current.h>
#include <asm/delay.h>
#include <asm/tlbflush.h>
@@ -56,42 +56,17 @@ static int smp_debug_lvl = 0;
if (lvl >= smp_debug_lvl) \
printk(printargs);
#else
-#define smp_debug(lvl, ...)
+#define smp_debug(lvl, ...) do { } while(0)
#endif /* DEBUG_SMP */
-DEFINE_SPINLOCK(smp_lock);
-
volatile struct task_struct *smp_init_current_idle_task;
-static volatile int cpu_now_booting __read_mostly = 0; /* track which CPU is booting */
-
-static int parisc_max_cpus __read_mostly = 1;
-
-/* online cpus are ones that we've managed to bring up completely
- * possible cpus are all valid cpu
- * present cpus are all detected cpu
- *
- * On startup we bring up the "possible" cpus. Since we discover
- * CPUs later, we add them as hotplug, so the possible cpu mask is
- * empty in the beginning.
- */
+/* track which CPU is booting */
+static volatile int cpu_now_booting;
-cpumask_t cpu_online_map __read_mostly = CPU_MASK_NONE; /* Bitmap of online CPUs */
-cpumask_t cpu_possible_map __read_mostly = CPU_MASK_ALL; /* Bitmap of Present CPUs */
+static int parisc_max_cpus = 1;
-EXPORT_SYMBOL(cpu_online_map);
-EXPORT_SYMBOL(cpu_possible_map);
-
-DEFINE_PER_CPU(spinlock_t, ipi_lock) = SPIN_LOCK_UNLOCKED;
-
-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;
+static DEFINE_PER_CPU(spinlock_t, ipi_lock);
enum ipi_message_type {
IPI_NOP=0,
@@ -135,26 +110,21 @@ halt_processor(void)
{
/* 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);
+ set_cpu_online(smp_processor_id(), false);
local_irq_disable();
for (;;)
;
}
-irqreturn_t
+irqreturn_t __irq_entry
ipi_interrupt(int irq, void *dev_id)
{
int this_cpu = smp_processor_id();
- struct cpuinfo_parisc *p = &cpu_data[this_cpu];
+ struct cpuinfo_parisc *p = &per_cpu(cpu_data, this_cpu);
unsigned long ops;
unsigned long flags;
- /* Count this now; we may make a call that never returns. */
- p->ipi_count++;
-
- mb(); /* Order interrupt and bit testing. */
-
for (;;) {
spinlock_t *lock = &per_cpu(ipi_lock, this_cpu);
spin_lock_irqsave(lock, flags);
@@ -179,41 +149,13 @@ ipi_interrupt(int irq, void *dev_id)
case IPI_RESCHEDULE:
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.
- */
+ inc_irq_stat(irq_resched_count);
+ scheduler_ipi();
break;
case IPI_CALL_FUNC:
smp_debug(100, KERN_DEBUG "CPU%d IPI_CALL_FUNC\n", this_cpu);
- {
- 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);
- }
+ generic_smp_call_function_interrupt();
break;
case IPI_CPU_START:
@@ -246,24 +188,29 @@ ipi_interrupt(int irq, void *dev_id)
static inline void
ipi_send(int cpu, enum ipi_message_type op)
{
- struct cpuinfo_parisc *p = &cpu_data[cpu];
+ struct cpuinfo_parisc *p = &per_cpu(cpu_data, cpu);
spinlock_t *lock = &per_cpu(ipi_lock, cpu);
unsigned long flags;
spin_lock_irqsave(lock, flags);
p->pending_ipi |= 1 << op;
- gsc_writel(IPI_IRQ - CPU_IRQ_BASE, cpu_data[cpu].hpa);
+ gsc_writel(IPI_IRQ - CPU_IRQ_BASE, p->hpa);
spin_unlock_irqrestore(lock, flags);
}
+static void
+send_IPI_mask(const struct cpumask *mask, enum ipi_message_type op)
+{
+ int cpu;
+
+ for_each_cpu(cpu, mask)
+ ipi_send(cpu, op);
+}
static inline void
send_IPI_single(int dest_cpu, enum ipi_message_type op)
{
- if (dest_cpu == NO_PROC_ID) {
- BUG();
- return;
- }
+ BUG_ON(dest_cpu == NO_PROC_ID);
ipi_send(dest_cpu, op);
}
@@ -295,96 +242,14 @@ smp_send_all_nop(void)
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_mask(const struct cpumask *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);
-
-/*
- * Flush all other CPU's tlb and then mine. Do this with on_each_cpu()
- * as we want to ensure all TLB's flushed before proceeding.
- */
-
-void
-smp_flush_tlb_all(void)
+void arch_send_call_function_single_ipi(int cpu)
{
- on_each_cpu(flush_tlb_all_local, NULL, 1, 1);
+ send_IPI_single(cpu, IPI_CALL_FUNC);
}
/*
@@ -405,19 +270,21 @@ smp_cpu_init(int cpunum)
mb();
/* Well, support 2.4 linux scheme as well. */
- if (cpu_test_and_set(cpunum, cpu_online_map))
- {
+ if (cpu_online(cpunum)) {
extern void machine_halt(void); /* arch/parisc.../process.c */
printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum);
machine_halt();
- }
+ }
+
+ notify_cpu_starting(cpunum);
+
+ set_cpu_online(cpunum, true);
/* Initialise the idle task for this CPU */
atomic_inc(&init_mm.mm_count);
current->active_mm = &init_mm;
- if(current->mm)
- BUG();
+ BUG_ON(current->mm);
enter_lazy_tlb(&init_mm, current);
init_IRQ(); /* make sure no IRQs are enabled or pending */
@@ -441,7 +308,7 @@ void __init smp_callin(void)
local_irq_enable(); /* Interrupts have been off until now */
- cpu_idle(); /* Wait for timer to schedule some work */
+ cpu_startup_entry(CPUHP_ONLINE);
/* NOTREACHED */
panic("smp_callin() AAAAaaaaahhhh....\n");
@@ -450,25 +317,11 @@ void __init smp_callin(void)
/*
* Bring one cpu online.
*/
-int __cpuinit smp_boot_one_cpu(int cpuid)
+int smp_boot_one_cpu(int cpuid, struct task_struct *idle)
{
- struct task_struct *idle;
+ const struct cpuinfo_parisc *p = &per_cpu(cpu_data, cpuid);
long timeout;
- /*
- * Create an idle task for this CPU. Note the address wed* give
- * to kernel_thread is irrelevant -- it's going to start
- * where OS_BOOT_RENDEVZ vector in SAL says to start. But
- * this gets all the other task-y sort of data structures set
- * up like we wish. We need to pull the just created idle task
- * off the run queue and stuff it into the init_tasks[] array.
- * Sheesh . . .
- */
-
- idle = fork_idle(cpuid);
- if (IS_ERR(idle))
- panic("SMP: fork failed for CPU:%d", cpuid);
-
task_thread_info(idle)->cpu = cpuid;
/* Let _start know what logical CPU we're booting
@@ -483,7 +336,7 @@ int __cpuinit smp_boot_one_cpu(int cpuid)
smp_init_current_idle_task = idle ;
mb();
- printk("Releasing cpu %d now, hpa=%lx\n", cpuid, cpu_data[cpuid].hpa);
+ printk(KERN_INFO "Releasing cpu %d now, hpa=%lx\n", cpuid, p->hpa);
/*
** This gets PDC to release the CPU from a very tight loop.
@@ -494,7 +347,7 @@ int __cpuinit smp_boot_one_cpu(int cpuid)
** EIR{0}). MEM_RENDEZ is valid only when it is nonzero and the
** contents of memory are valid."
*/
- gsc_writel(TIMER_IRQ - CPU_IRQ_BASE, cpu_data[cpuid].hpa);
+ gsc_writel(TIMER_IRQ - CPU_IRQ_BASE, p->hpa);
mb();
/*
@@ -512,10 +365,6 @@ int __cpuinit smp_boot_one_cpu(int cpuid)
udelay(100);
barrier();
}
-
- put_task_struct(idle);
- idle = NULL;
-
printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid);
return -1;
@@ -526,15 +375,15 @@ alive:
return 0;
}
-void __devinit smp_prepare_boot_cpu(void)
+void __init smp_prepare_boot_cpu(void)
{
- int bootstrap_processor=cpu_data[0].cpuid; /* CPU ID of BSP */
+ int bootstrap_processor = per_cpu(cpu_data, 0).cpuid;
/* Setup BSP mappings */
- printk("SMP: bootstrap CPU ID is %d\n",bootstrap_processor);
+ printk(KERN_INFO "SMP: bootstrap CPU ID is %d\n", bootstrap_processor);
- cpu_set(bootstrap_processor, cpu_online_map);
- cpu_set(bootstrap_processor, cpu_present_map);
+ set_cpu_online(bootstrap_processor, true);
+ set_cpu_present(bootstrap_processor, true);
}
@@ -545,8 +394,12 @@ void __devinit smp_prepare_boot_cpu(void)
*/
void __init smp_prepare_cpus(unsigned int max_cpus)
{
- cpus_clear(cpu_present_map);
- cpu_set(0, cpu_present_map);
+ int cpu;
+
+ for_each_possible_cpu(cpu)
+ spin_lock_init(&per_cpu(ipi_lock, cpu));
+
+ init_cpu_present(cpumask_of(0));
parisc_max_cpus = max_cpus;
if (!max_cpus)
@@ -560,10 +413,10 @@ void smp_cpus_done(unsigned int cpu_max)
}
-int __cpuinit __cpu_up(unsigned int cpu)
+int __cpu_up(unsigned int cpu, struct task_struct *tidle)
{
if (cpu != 0 && cpu < parisc_max_cpus)
- smp_boot_one_cpu(cpu);
+ smp_boot_one_cpu(cpu, tidle);
return cpu_online(cpu) ? 0 : -ENOSYS;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 05:36:32 +0000