aboutsummaryrefslogtreecommitdiffstats
path: root/arch/alpha/kernel/smp.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/alpha/kernel/smp.c')
-rw-r--r--arch/alpha/kernel/smp.c180
1 files changed, 15 insertions, 165 deletions
diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c
index 2525692db0ab..83df541650fc 100644
--- a/arch/alpha/kernel/smp.c
+++ b/arch/alpha/kernel/smp.c
@@ -62,6 +62,7 @@ static struct {
enum ipi_message_type {
IPI_RESCHEDULE,
IPI_CALL_FUNC,
+ IPI_CALL_FUNC_SINGLE,
IPI_CPU_STOP,
};
@@ -558,51 +559,6 @@ send_ipi_message(cpumask_t to_whom, enum ipi_message_type operation)
wripir(i);
}
-/* Structure and data for smp_call_function. This is designed to
- minimize static memory requirements. Plus it looks cleaner. */
-
-struct smp_call_struct {
- void (*func) (void *info);
- void *info;
- long wait;
- atomic_t unstarted_count;
- atomic_t unfinished_count;
-};
-
-static struct smp_call_struct *smp_call_function_data;
-
-/* Atomicly drop data into a shared pointer. The pointer is free if
- it is initially locked. If retry, spin until free. */
-
-static int
-pointer_lock (void *lock, void *data, int retry)
-{
- void *old, *tmp;
-
- mb();
- again:
- /* Compare and swap with zero. */
- asm volatile (
- "1: ldq_l %0,%1\n"
- " mov %3,%2\n"
- " bne %0,2f\n"
- " stq_c %2,%1\n"
- " beq %2,1b\n"
- "2:"
- : "=&r"(old), "=m"(*(void **)lock), "=&r"(tmp)
- : "r"(data)
- : "memory");
-
- if (old == 0)
- return 0;
- if (! retry)
- return -EBUSY;
-
- while (*(void **)lock)
- barrier();
- goto again;
-}
-
void
handle_ipi(struct pt_regs *regs)
{
@@ -632,31 +588,12 @@ handle_ipi(struct pt_regs *regs)
break;
case IPI_CALL_FUNC:
- {
- 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;
-
- /* Notify the sending CPU that the data has been
- received, and execution is about to begin. */
- mb();
- atomic_dec (&data->unstarted_count);
-
- /* At this point the structure may be gone unless
- wait is true. */
- (*func)(info);
-
- /* Notify the sending CPU that the task is done. */
- mb();
- if (wait) atomic_dec (&data->unfinished_count);
+ generic_smp_call_function_interrupt();
+ break;
+
+ case IPI_CALL_FUNC_SINGLE:
+ generic_smp_call_function_single_interrupt();
break;
- }
case IPI_CPU_STOP:
halt();
@@ -700,102 +637,15 @@ smp_send_stop(void)
send_ipi_message(to_whom, IPI_CPU_STOP);
}
-/*
- * 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 are or have executed.
- * 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_on_cpu (void (*func) (void *info), void *info, int retry,
- int wait, cpumask_t to_whom)
+void arch_send_call_function_ipi(cpumask_t mask)
{
- struct smp_call_struct data;
- unsigned long timeout;
- int num_cpus_to_call;
-
- /* Can deadlock when called with interrupts disabled */
- WARN_ON(irqs_disabled());
-
- data.func = func;
- data.info = info;
- data.wait = wait;
-
- cpu_clear(smp_processor_id(), to_whom);
- num_cpus_to_call = cpus_weight(to_whom);
-
- atomic_set(&data.unstarted_count, num_cpus_to_call);
- atomic_set(&data.unfinished_count, num_cpus_to_call);
-
- /* Acquire the smp_call_function_data mutex. */
- if (pointer_lock(&smp_call_function_data, &data, retry))
- return -EBUSY;
-
- /* Send a message to the requested CPUs. */
- send_ipi_message(to_whom, IPI_CALL_FUNC);
-
- /* Wait for a minimal response. */
- timeout = jiffies + HZ;
- while (atomic_read (&data.unstarted_count) > 0
- && time_before (jiffies, timeout))
- barrier();
-
- /* If there's no response yet, log a message but allow a longer
- * timeout period -- if we get a response this time, log
- * a message saying when we got it..
- */
- if (atomic_read(&data.unstarted_count) > 0) {
- long start_time = jiffies;
- printk(KERN_ERR "%s: initial timeout -- trying long wait\n",
- __func__);
- timeout = jiffies + 30 * HZ;
- while (atomic_read(&data.unstarted_count) > 0
- && time_before(jiffies, timeout))
- barrier();
- if (atomic_read(&data.unstarted_count) <= 0) {
- long delta = jiffies - start_time;
- printk(KERN_ERR
- "%s: response %ld.%ld seconds into long wait\n",
- __func__, delta / HZ,
- (100 * (delta - ((delta / HZ) * HZ))) / HZ);
- }
- }
-
- /* We either got one or timed out -- clear the lock. */
- mb();
- smp_call_function_data = NULL;
-
- /*
- * If after both the initial and long timeout periods we still don't
- * have a response, something is very wrong...
- */
- BUG_ON(atomic_read (&data.unstarted_count) > 0);
-
- /* Wait for a complete response, if needed. */
- if (wait) {
- while (atomic_read (&data.unfinished_count) > 0)
- barrier();
- }
-
- return 0;
+ send_ipi_message(mask, IPI_CALL_FUNC);
}
-EXPORT_SYMBOL(smp_call_function_on_cpu);
-int
-smp_call_function (void (*func) (void *info), void *info, int retry, int wait)
+void arch_send_call_function_single_ipi(int cpu)
{
- return smp_call_function_on_cpu (func, info, retry, wait,
- cpu_online_map);
+ send_ipi_message(cpumask_of_cpu(cpu), IPI_CALL_FUNC_SINGLE);
}
-EXPORT_SYMBOL(smp_call_function);
static void
ipi_imb(void *ignored)
@@ -807,7 +657,7 @@ void
smp_imb(void)
{
/* Must wait other processors to flush their icache before continue. */
- if (on_each_cpu(ipi_imb, NULL, 1, 1))
+ if (on_each_cpu(ipi_imb, NULL, 1))
printk(KERN_CRIT "smp_imb: timed out\n");
}
EXPORT_SYMBOL(smp_imb);
@@ -823,7 +673,7 @@ flush_tlb_all(void)
{
/* Although we don't have any data to pass, we do want to
synchronize with the other processors. */
- if (on_each_cpu(ipi_flush_tlb_all, NULL, 1, 1)) {
+ if (on_each_cpu(ipi_flush_tlb_all, NULL, 1)) {
printk(KERN_CRIT "flush_tlb_all: timed out\n");
}
}
@@ -860,7 +710,7 @@ flush_tlb_mm(struct mm_struct *mm)
}
}
- if (smp_call_function(ipi_flush_tlb_mm, mm, 1, 1)) {
+ if (smp_call_function(ipi_flush_tlb_mm, mm, 1)) {
printk(KERN_CRIT "flush_tlb_mm: timed out\n");
}
@@ -913,7 +763,7 @@ flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
data.mm = mm;
data.addr = addr;
- if (smp_call_function(ipi_flush_tlb_page, &data, 1, 1)) {
+ if (smp_call_function(ipi_flush_tlb_page, &data, 1)) {
printk(KERN_CRIT "flush_tlb_page: timed out\n");
}
@@ -965,7 +815,7 @@ flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
}
}
- if (smp_call_function(ipi_flush_icache_page, mm, 1, 1)) {
+ if (smp_call_function(ipi_flush_icache_page, mm, 1)) {
printk(KERN_CRIT "flush_icache_page: timed out\n");
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.