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powerpc: convert to generic helpers for IPI function calls 

This converts ppc to use the new helpers for smp_call_function() and
friends, and adds support for smp_call_function_single().

ppc loses the timeout functionality of smp_call_function_mask() with
this change, as the generic code does not provide that.

Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2008-06-26 11:22:13 +02:00
parent 3b16cf8748
commit b7d7a2404f
7 changed files with 33 additions and 226 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/powerpc/Kconfig
View File

@ -110,6 +110,7 @@ config PPC
select HAVE_KPROBES
select HAVE_KRETPROBES
select HAVE_LMB
select USE_GENERIC_SMP_HELPERS if SMP
config EARLY_PRINTK
bool

234
arch/powerpc/kernel/smp.c
View File

@ -72,12 +72,8 @@ struct smp_ops_t *smp_ops;
static volatile unsigned int cpu_callin_map[NR_CPUS];
void smp_call_function_interrupt(void);
int smt_enabled_at_boot = 1;
static int ipi_fail_ok;
static void (*crash_ipi_function_ptr)(struct pt_regs *) = NULL;
#ifdef CONFIG_PPC64
@ -99,12 +95,15 @@ void smp_message_recv(int msg)
{
switch(msg) {
case PPC_MSG_CALL_FUNCTION:
smp_call_function_interrupt();
generic_smp_call_function_interrupt();
break;
case PPC_MSG_RESCHEDULE:
/* XXX Do we have to do this? */
set_need_resched();
break;
case PPC_MSG_CALL_FUNC_SINGLE:
generic_smp_call_function_single_interrupt();
break;
case PPC_MSG_DEBUGGER_BREAK:
if (crash_ipi_function_ptr) {
crash_ipi_function_ptr(get_irq_regs());
@ -128,6 +127,19 @@ void smp_send_reschedule(int cpu)
smp_ops->message_pass(cpu, PPC_MSG_RESCHEDULE);
}
void arch_send_call_function_single_ipi(int cpu)
{
smp_ops->message_pass(cpu, PPC_MSG_CALL_FUNC_SINGLE);
}
void arch_send_call_function_ipi(cpumask_t mask)
{
unsigned int cpu;
for_each_cpu_mask(cpu, mask)
smp_ops->message_pass(cpu, PPC_MSG_CALL_FUNCTION);
}
#ifdef CONFIG_DEBUGGER
void smp_send_debugger_break(int cpu)
{
@ -154,215 +166,9 @@ static void stop_this_cpu(void *dummy)
;
}
/*
* Structure and data for smp_call_function(). This is designed to minimise
* static memory requirements. It also looks cleaner.
* Stolen from the i386 version.
*/
static __cacheline_aligned_in_smp DEFINE_SPINLOCK(call_lock);
static struct call_data_struct {
void (*func) (void *info);
void *info;
atomic_t started;
atomic_t finished;
int wait;
} *call_data;
/* delay of at least 8 seconds */
#define SMP_CALL_TIMEOUT 8
/*
* These functions send a 'generic call function' IPI to other online
* CPUS in the system.
*
* [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.
* <wait> If true, wait (atomically) 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.
* <map> is a cpu map of the cpus to send IPI to.
*
* You must not call this function with disabled interrupts or from a
* hardware interrupt handler or from a bottom half handler.
*/
static 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, num_cpus;
int cpu;
u64 timeout;
if (unlikely(smp_ops == NULL))
return ret;
data.func = func;
data.info = info;
atomic_set(&data.started, 0);
data.wait = wait;
if (wait)
atomic_set(&data.finished, 0);
/* 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);
num_cpus = cpus_weight(map);
if (!num_cpus)
goto done;
call_data = &data;
smp_wmb();
/* 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 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));
if (!ipi_fail_ok)
debugger(NULL);
goto out;
}
}
/* optionally wait for the CPUs to complete */
if (wait) {
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));
debugger(NULL);
goto out;
}
}
}
done:
ret = 0;
out:
call_data = NULL;
HMT_medium();
return ret;
}
static int __smp_call_function(void (*func)(void *info), void *info,
int nonatomic, int wait)
{
int ret;
spin_lock(&call_lock);
ret =__smp_call_function_map(func, info, nonatomic, wait,
cpu_online_map);
spin_unlock(&call_lock);
return ret;
}
int smp_call_function(void (*func) (void *info), void *info, int nonatomic,
int wait)
{
/* Can deadlock when called with interrupts disabled */
WARN_ON(irqs_disabled());
return __smp_call_function(func, info, nonatomic, wait);
}
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;
int ret = 0;
/* Can deadlock when called with interrupts disabled */
WARN_ON(irqs_disabled());
if (!cpu_online(cpu))
return -EINVAL;
cpu_set(cpu, map);
if (cpu != get_cpu()) {
spin_lock(&call_lock);
ret = __smp_call_function_map(func, info, nonatomic, wait, map);
spin_unlock(&call_lock);
} else {
local_irq_disable();
func(info);
local_irq_enable();
}
put_cpu();
return ret;
}
EXPORT_SYMBOL(smp_call_function_single);
void smp_send_stop(void)
{
int nolock;
/* It's OK to fail sending the IPI, since the alternative is to
* be stuck forever waiting on the other CPU to take the interrupt.
*
* It's better to at least continue and go through reboot, since this
* function is usually called at panic or reboot time in the first
* place.
*/
ipi_fail_ok = 1;
/* Don't deadlock in case we got called through panic */
nolock = !spin_trylock(&call_lock);
__smp_call_function_map(stop_this_cpu, NULL, 1, 0, cpu_online_map);
if (!nolock)
spin_unlock(&call_lock);
}
void smp_call_function_interrupt(void)
{
void (*func) (void *info);
void *info;
int wait;
/* call_data will be NULL if the sender timed out while
* waiting on us to receive the call.
*/
if (!call_data)
return;
func = call_data->func;
info = call_data->info;
wait = call_data->wait;
if (!wait)
smp_mb__before_atomic_inc();
/*
* Notify initiating CPU that I've grabbed the data and am
* about to execute the function
*/
atomic_inc(&call_data->started);
/*
* At this point the info structure may be out of scope unless wait==1
*/
(*func)(info);
if (wait) {
smp_mb__before_atomic_inc();
atomic_inc(&call_data->finished);
}
smp_call_function(stop_this_cpu, NULL, 0, 0);
}
extern struct gettimeofday_struct do_gtod;
@ -596,9 +402,9 @@ int __devinit start_secondary(void *unused)
secondary_cpu_time_init();
spin_lock(&call_lock);
ipi_call_lock();
cpu_set(cpu, cpu_online_map);
spin_unlock(&call_lock);
ipi_call_unlock();
local_irq_enable();

1
arch/powerpc/platforms/cell/interrupt.c
View File

@ -218,6 +218,7 @@ void iic_request_IPIs(void)
{
iic_request_ipi(PPC_MSG_CALL_FUNCTION, "IPI-call");
iic_request_ipi(PPC_MSG_RESCHEDULE, "IPI-resched");
iic_request_ipi(PPC_MSG_CALL_FUNC_SINGLE, "IPI-call-single");
#ifdef CONFIG_DEBUGGER
iic_request_ipi(PPC_MSG_DEBUGGER_BREAK, "IPI-debug");
#endif /* CONFIG_DEBUGGER */

7
arch/powerpc/platforms/ps3/smp.c
View File

@ -105,9 +105,10 @@ static void __init ps3_smp_setup_cpu(int cpu)
* to index needs to be setup.
*/
BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION != 0);
BUILD_BUG_ON(PPC_MSG_RESCHEDULE != 1);
BUILD_BUG_ON(PPC_MSG_DEBUGGER_BREAK != 3);
BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION != 0);
BUILD_BUG_ON(PPC_MSG_RESCHEDULE != 1);
BUILD_BUG_ON(PPC_MSG_CALL_FUNC_SINGLE != 2);
BUILD_BUG_ON(PPC_MSG_DEBUGGER_BREAK != 3);
for (i = 0; i < MSG_COUNT; i++) {
result = ps3_event_receive_port_setup(cpu, &virqs[i]);

6
arch/powerpc/platforms/pseries/xics.c
View File

@ -383,13 +383,11 @@ static irqreturn_t xics_ipi_dispatch(int cpu)
mb();
smp_message_recv(PPC_MSG_RESCHEDULE);
}
#if 0
if (test_and_clear_bit(PPC_MSG_MIGRATE_TASK,
if (test_and_clear_bit(PPC_MSG_CALL_FUNC_SINGLE,
&xics_ipi_message[cpu].value)) {
mb();
smp_message_recv(PPC_MSG_MIGRATE_TASK);
smp_message_recv(PPC_MSG_CALL_FUNC_SINGLE);
}
#endif
#if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
if (test_and_clear_bit(PPC_MSG_DEBUGGER_BREAK,
&xics_ipi_message[cpu].value)) {

2
arch/powerpc/sysdev/mpic.c
View File

@ -1494,7 +1494,7 @@ void mpic_request_ipis(void)
static char *ipi_names[] = {
"IPI0 (call function)",
"IPI1 (reschedule)",
"IPI2 (unused)",
"IPI2 (call function single)",
"IPI3 (debugger break)",
};
BUG_ON(mpic == NULL);

8
include/asm-powerpc/smp.h
View File

@ -67,10 +67,7 @@ DECLARE_PER_CPU(cpumask_t, cpu_sibling_map);
* in /proc/interrupts will be wrong!!! --Troy */
#define PPC_MSG_CALL_FUNCTION 0
#define PPC_MSG_RESCHEDULE 1
/* This is unused now */
#if 0
#define PPC_MSG_MIGRATE_TASK 2
#endif
#define PPC_MSG_CALL_FUNC_SINGLE 2
#define PPC_MSG_DEBUGGER_BREAK 3
void smp_init_iSeries(void);
@ -117,6 +114,9 @@ extern void smp_generic_take_timebase(void);
extern struct smp_ops_t *smp_ops;
extern void arch_send_call_function_single_ipi(int cpu);
extern void arch_send_call_function_ipi(cpumask_t mask);
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */