@@ -711,7 +711,23 @@ static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
}
#if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
+#ifdef CONFIG_QUEUE_SPINLOCK
+static __always_inline void __queue_kick_cpu(int cpu)
+{
+ PVOP_VCALL1(pv_lock_ops.kick_cpu, cpu);
+}
+
+static __always_inline void
+__queue_halt_cpu(enum pv_lock_stats type, s8 *state, s8 sval)
+{
+ PVOP_VCALL3(pv_lock_ops.halt_cpu, type, state, sval);
+}
+static __always_inline void __queue_lockstat(enum pv_lock_stats type)
+{
+ PVOP_VCALL1(pv_lock_ops.lockstat, type);
+}
+#else
static __always_inline void __ticket_lock_spinning(struct arch_spinlock *lock,
__ticket_t ticket)
{
@@ -723,7 +739,7 @@ static __always_inline void __ticket_unlock_kick(struct arch_spinlock *lock,
{
PVOP_VCALL2(pv_lock_ops.unlock_kick, lock, ticket);
}
-
+#endif
#endif
#ifdef CONFIG_X86_32
@@ -333,9 +333,26 @@ struct arch_spinlock;
typedef u16 __ticket_t;
#endif
+#ifdef CONFIG_QUEUE_SPINLOCK
+enum pv_lock_stats {
+ PV_HALT_QHEAD, /* Queue head halting */
+ PV_HALT_QNODE, /* Other queue node halting */
+ PV_HALT_ABORT, /* Halting aborted */
+ PV_WAKE_KICKED, /* Wakeup by kicking */
+ PV_WAKE_SPURIOUS, /* Spurious wakeup */
+ PV_KICK_NOHALT /* Kick but CPU not halted */
+};
+#endif
+
struct pv_lock_ops {
+#ifdef CONFIG_QUEUE_SPINLOCK
+ void (*kick_cpu)(int cpu);
+ void (*halt_cpu)(enum pv_lock_stats type, s8 *state, s8 sval);
+ void (*lockstat)(enum pv_lock_stats type);
+#else
struct paravirt_callee_save lock_spinning;
void (*unlock_kick)(struct arch_spinlock *lock, __ticket_t ticket);
+#endif
};
/* This contains all the paravirt structures: we get a convenient
@@ -11,9 +11,15 @@
#ifdef CONFIG_PARAVIRT_SPINLOCKS
struct pv_lock_ops pv_lock_ops = {
#ifdef CONFIG_SMP
+#ifdef CONFIG_QUEUE_SPINLOCK
+ .kick_cpu = paravirt_nop,
+ .halt_cpu = paravirt_nop,
+ .lockstat = paravirt_nop,
+#else
.lock_spinning = __PV_IS_CALLEE_SAVE(paravirt_nop),
.unlock_kick = paravirt_nop,
#endif
+#endif
};
EXPORT_SYMBOL(pv_lock_ops);
This patch modifies the para-virtualization (PV) infrastructure code of the x86-64 architecture to support the PV queue spinlock. Three new virtual methods are added to support PV qspinlock: 1) kick_cpu - schedule in a virtual CPU 2) halt_cpu - schedule out a virtual CPU 3) lockstat - update statistical data for debugfs Signed-off-by: Waiman Long <Waiman.Long@hp.com> --- arch/x86/include/asm/paravirt.h | 18 +++++++++++++++++- arch/x86/include/asm/paravirt_types.h | 17 +++++++++++++++++ arch/x86/kernel/paravirt-spinlocks.c | 6 ++++++ 3 files changed, 40 insertions(+), 1 deletions(-)