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sparc64: Use CPU_POKE to resume idle cpu

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Use CPU_POKE hypervisor call to resume idle cpu if supported.

Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vijay Kumar
2017-07-21 10:23:57 -06:00
committed by David S. Miller
parent 28d43de741
commit 8536e02e91
5 changed files with 90 additions and 5 deletions
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80
arch/sparc/kernel/smp_64.c
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@@ -74,6 +74,9 @@ EXPORT_SYMBOL(cpu_core_sib_cache_map);
static cpumask_t smp_commenced_mask;
static DEFINE_PER_CPU(bool, poke);
static bool cpu_poke;
void smp_info(struct seq_file *m)
{
int i;
@@ -1439,15 +1442,86 @@ void __init smp_cpus_done(unsigned int max_cpus)
{
}
static void send_cpu_ipi(int cpu)
{
xcall_deliver((u64) &xcall_receive_signal,
0, 0, cpumask_of(cpu));
}
void scheduler_poke(void)
{
if (!cpu_poke)
return;
if (!__this_cpu_read(poke))
return;
__this_cpu_write(poke, false);
set_softint(1 << PIL_SMP_RECEIVE_SIGNAL);
}
static unsigned long send_cpu_poke(int cpu)
{
unsigned long hv_err;
per_cpu(poke, cpu) = true;
hv_err = sun4v_cpu_poke(cpu);
if (hv_err != HV_EOK) {
per_cpu(poke, cpu) = false;
pr_err_ratelimited("%s: sun4v_cpu_poke() fails err=%lu\n",
__func__, hv_err);
}
return hv_err;
}
void smp_send_reschedule(int cpu)
{
if (cpu == smp_processor_id()) {
WARN_ON_ONCE(preemptible());
set_softint(1 << PIL_SMP_RECEIVE_SIGNAL);
} else {
xcall_deliver((u64) &xcall_receive_signal,
0, 0, cpumask_of(cpu));
return;
}
/* Use cpu poke to resume idle cpu if supported. */
if (cpu_poke && idle_cpu(cpu)) {
unsigned long ret;
ret = send_cpu_poke(cpu);
if (ret == HV_EOK)
return;
}
/* Use IPI in following cases:
* - cpu poke not supported
* - cpu not idle
* - send_cpu_poke() returns with error
*/
send_cpu_ipi(cpu);
}
void smp_init_cpu_poke(void)
{
unsigned long major;
unsigned long minor;
int ret;
if (tlb_type != hypervisor)
return;
ret = sun4v_hvapi_get(HV_GRP_CORE, &major, &minor);
if (ret) {
pr_debug("HV_GRP_CORE is not registered\n");
return;
}
if (major == 1 && minor >= 6) {
/* CPU POKE is registered. */
cpu_poke = true;
return;
}
pr_debug("CPU_POKE not supported\n");
}
void __irq_entry smp_receive_signal_client(int irq, struct pt_regs *regs)