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[POWERPC] Add smp_call_function_map and smp_call_function_single

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Add a new function named smp_call_function_single().  This matches a generic
prototype from include/linux/smp.h.

Add a function smp_call_function_map().  This is, for the most part, a rename
of smp_call_function, with some added cpumask support.  smp_call_function and
smp_call_function_single call into smp_call_function_map.

Lightly tested on 970mp (blade), power4 and power5.

Signed-off-by: Will Schmidt <will_schmidt@vnet.ibm.com>
cc: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
will schmidt 2007-05-03 03:12:34 +10:00 committed by Paul Mackerras
parent e9e77ce871
commit 44755d11a3
1 changed files with 52 additions and 21 deletions
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73
arch/powerpc/kernel/smp.c
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@ -176,10 +176,10 @@ static struct call_data_struct {
#define SMP_CALL_TIMEOUT 8
/*
* This function sends a 'generic call function' IPI to all other CPUs
* in the system.
* These functions send a 'generic call function' IPI to other online
* CPUS in the system.
*
* [SUMMARY] Run a function on all other CPUs.
* [SUMMARY] Run a function on other CPUs.
* <func> The function to run. This must be fast and non-blocking.
* <info> An arbitrary pointer to pass to the function.
* <nonatomic> currently unused.
@ -190,18 +190,26 @@ static struct call_data_struct {
* 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 (void (*func) (void *info), void *info, int nonatomic,
int wait)
{
int smp_call_function_map(void (*func) (void *info), void *info, int nonatomic,
int wait, cpumask_t map)
{
struct call_data_struct data;
int ret = -1, cpus;
int ret = -1, num_cpus;
int cpu;
u64 timeout;
/* Can deadlock when called with interrupts disabled */
WARN_ON(irqs_disabled());
/* remove 'self' from the map */
if (cpu_isset(smp_processor_id(), map))
cpu_clear(smp_processor_id(), map);
/* sanity check the map, remove any non-online processors. */
cpus_and(map, map, cpu_online_map);
if (unlikely(smp_ops == NULL))
return -1;
return ret;
data.func = func;
data.info = info;
@ -213,40 +221,42 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
spin_lock(&call_lock);
/* Must grab online cpu count with preempt disabled, otherwise
* it can change. */
cpus = num_online_cpus() - 1;
if (!cpus) {
num_cpus = num_online_cpus() - 1;
if (!num_cpus || cpus_empty(map)) {
ret = 0;
goto out;
}
call_data = &data;
smp_wmb();
/* Send a message to all other CPUs and wait for them to respond */
smp_ops->message_pass(MSG_ALL_BUT_SELF, PPC_MSG_CALL_FUNCTION);
/* Send a message to all CPUs in the map */
for_each_cpu_mask(cpu, map)
smp_ops->message_pass(cpu, PPC_MSG_CALL_FUNCTION);
timeout = get_tb() + (u64) SMP_CALL_TIMEOUT * tb_ticks_per_sec;
/* Wait for response */
while (atomic_read(&data.started) != cpus) {
/* Wait for indication that they have received the message */
while (atomic_read(&data.started) != num_cpus) {
HMT_low();
if (get_tb() >= timeout) {
printk("smp_call_function on cpu %d: other cpus not "
"responding (%d)\n", smp_processor_id(),
atomic_read(&data.started));
"responding (%d)\n", smp_processor_id(),
atomic_read(&data.started));
debugger(NULL);
goto out;
}
}
/* optionally wait for the CPUs to complete */
if (wait) {
while (atomic_read(&data.finished) != cpus) {
while (atomic_read(&data.finished) != num_cpus) {
HMT_low();
if (get_tb() >= timeout) {
printk("smp_call_function on cpu %d: other "
"cpus not finishing (%d/%d)\n",
smp_processor_id(),
atomic_read(&data.finished),
atomic_read(&data.started));
"cpus not finishing (%d/%d)\n",
smp_processor_id(),
atomic_read(&data.finished),
atomic_read(&data.started));
debugger(NULL);
goto out;
}
@ -262,8 +272,29 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
return ret;
}
int smp_call_function(void (*func) (void *info), void *info, int nonatomic,
int wait)
{
return smp_call_function_map(func,info,nonatomic,wait,cpu_online_map);
}
EXPORT_SYMBOL(smp_call_function);
int smp_call_function_single(int cpu, void (*func) (void *info), void *info, int nonatomic,
int wait)
{
cpumask_t map=CPU_MASK_NONE;
if (!cpu_online(cpu))
return -EINVAL;
if (cpu == smp_processor_id())
return -EBUSY;
cpu_set(cpu, map);
return smp_call_function_map(func,info,nonatomic,wait,map);
}
EXPORT_SYMBOL(smp_call_function_single);
void smp_call_function_interrupt(void)
{
void (*func) (void *info);