[tip:smp/hotplug] sparc: Use generic idle loop

tip-bot for Sam Ravnborg
2013-04-13T19:54:12Z

Commit-ID: 87fa05aeb3a5e8e21b1a5510eef6983650eff092
Gitweb: http://git.kernel.org/tip/87fa05aeb3a5e8e21b1a5510eef6983650eff092
Author: Sam Ravnborg <sam@ravnborg.org>
AuthorDate: Thu, 11 Apr 2013 21:38:50 +0200
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Sat, 13 Apr 2013 21:36:27 +0200

sparc: Use generic idle loop

Add generic cpu_idle support

sparc32:
- replace call to cpu_idle() with cpu_startup_entry()
- add arch_cpu_idle()

sparc64:
- smp_callin() now include cpu_startup_entry() call so we can
skip calling cpu_idle from assembler
- add arch_cpu_idle() and arch_cpu_idle_dead()

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Cc: torvalds@linux-foundation.org
Cc: rusty@rustcorp.com.au
Cc: paulmck@linux.vnet.ibm.com
Cc: peterz@infradead.org
Cc: magnus.damm@gmail.com
Acked-by: David Miller <davem@davemloft.net>
Link: http://lkml.kernel.org/r/20130411193850.GA2330@merkur.ravnborg.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/sparc/Kconfig | 1 +
arch/sparc/kernel/hvtramp.S | 3 +--
arch/sparc/kernel/process_32.c | 21 ++++-------------
arch/sparc/kernel/process_64.c | 49 +++++++++++----------------------------
arch/sparc/kernel/smp_32.c | 2 +-
arch/sparc/kernel/smp_64.c | 2 ++
arch/sparc/kernel/trampoline_64.S | 3 +--
7 files changed, 24 insertions(+), 57 deletions(-)

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 3d361f2..ee5eacc 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -37,6 +37,7 @@ config SPARC
select GENERIC_SMP_IDLE_THREAD
select GENERIC_CMOS_UPDATE
select GENERIC_CLOCKEVENTS
+ select GENERIC_IDLE_LOOP
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select MODULES_USE_ELF_RELA
diff --git a/arch/sparc/kernel/hvtramp.S b/arch/sparc/kernel/hvtramp.S
index 9365432..605c960 100644
--- a/arch/sparc/kernel/hvtramp.S
+++ b/arch/sparc/kernel/hvtramp.S
@@ -128,8 +128,7 @@ hv_cpu_startup:

call smp_callin
nop
- call cpu_idle
- mov 0, %o0
+
call cpu_panic
nop

diff --git a/arch/sparc/kernel/process_32.c b/arch/sparc/kernel/process_32.c
index 62eede1..c852410 100644
--- a/arch/sparc/kernel/process_32.c
+++ b/arch/sparc/kernel/process_32.c
@@ -64,23 +64,12 @@ extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *);
struct task_struct *last_task_used_math = NULL;
struct thread_info *current_set[NR_CPUS];

-/*
- * the idle loop on a Sparc... ;)
- */
-void cpu_idle(void)
+/* Idle loop support. */
+void arch_cpu_idle(void)
{
- set_thread_flag(TIF_POLLING_NRFLAG);
-
- /* endless idle loop with no priority at all */
- for (;;) {
- while (!need_resched()) {
- if (sparc_idle)
- (*sparc_idle)();
- else
- cpu_relax();
- }
- schedule_preempt_disabled();
- }
+ if (sparc_idle)
+ (*sparc_idle)();
+ local_irq_enable();
}

/* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */
diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c
index cdb80b2..9fbf0d1 100644
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -52,20 +52,17 @@

#include "kstack.h"

-static void sparc64_yield(int cpu)
+/* Idle loop support on sparc64. */
+void arch_cpu_idle(void)
{
if (tlb_type != hypervisor) {
touch_nmi_watchdog();
- return;
- }
-
- clear_thread_flag(TIF_POLLING_NRFLAG);
- smp_mb__after_clear_bit();
-
- while (!need_resched() && !cpu_is_offline(cpu)) {
+ } else {
unsigned long pstate;

- /* Disable interrupts. */
+ /* The sun4v sleeping code requires that we have PSTATE.IE cleared over
+ * the cpu sleep hypervisor call.
+ */
__asm__ __volatile__(
"rdpr %%pstate, %0\n\t"
"andn %0, %1, %0\n\t"
@@ -73,7 +70,7 @@ static void sparc64_yield(int cpu)
: "=&r" (pstate)
: "i" (PSTATE_IE));

- if (!need_resched() && !cpu_is_offline(cpu))
+ if (!need_resched() && !cpu_is_offline(smp_processor_id()))
sun4v_cpu_yield();

/* Re-enable interrupts. */
@@ -84,36 +81,16 @@ static void sparc64_yield(int cpu)
: "=&r" (pstate)
: "i" (PSTATE_IE));
}
-
- set_thread_flag(TIF_POLLING_NRFLAG);
+ local_irq_enable();
}

-/* The idle loop on sparc64. */
-void cpu_idle(void)
-{
- int cpu = smp_processor_id();
-
- set_thread_flag(TIF_POLLING_NRFLAG);
-
- while(1) {
- tick_nohz_idle_enter();
- rcu_idle_enter();
-
- while (!need_resched() && !cpu_is_offline(cpu))
- sparc64_yield(cpu);
-
- rcu_idle_exit();
- tick_nohz_idle_exit();
-
#ifdef CONFIG_HOTPLUG_CPU
- if (cpu_is_offline(cpu)) {
- sched_preempt_enable_no_resched();
- cpu_play_dead();
- }
-#endif
- schedule_preempt_disabled();
- }
+void arch_cpu_idle_dead()
+{
+ sched_preempt_enable_no_resched();
+ cpu_play_dead();
}
+#endif

#ifdef CONFIG_COMPAT
static void show_regwindow32(struct pt_regs *regs)
diff --git a/arch/sparc/kernel/smp_32.c b/arch/sparc/kernel/smp_32.c
index 9e7e6d7..e3f2b81 100644
--- a/arch/sparc/kernel/smp_32.c
+++ b/arch/sparc/kernel/smp_32.c
@@ -369,7 +369,7 @@ void __cpuinit sparc_start_secondary(void *arg)
local_irq_enable();

wmb();
- cpu_idle();
+ cpu_startup_entry(CPUHP_ONLINE);

/* We should never reach here! */
BUG();
diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index 537eb66..c025ffc 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -127,6 +127,8 @@ void __cpuinit smp_callin(void)

/* idle thread is expected to have preempt disabled */
preempt_disable();
+
+ cpu_startup_entry(CPUHP_ONLINE);
}

void cpu_panic(void)
diff --git a/arch/sparc/kernel/trampoline_64.S b/arch/sparc/kernel/trampoline_64.S
index da1b781..2e973a2 100644
--- a/arch/sparc/kernel/trampoline_64.S
+++ b/arch/sparc/kernel/trampoline_64.S
@@ -407,8 +407,7 @@ after_lock_tlb:

call smp_callin
nop
- call cpu_idle
- mov 0, %o0
+
call cpu_panic
nop
1: b,a,pt %xcc, 1b