Merge branch 'x86/spinlocks' into x86/xen
This commit is contained in:
commit
eac4345be6
|
@ -10,7 +10,7 @@ ifdef CONFIG_FTRACE
|
|||
# Do not profile debug and lowlevel utilities
|
||||
CFLAGS_REMOVE_tsc.o = -pg
|
||||
CFLAGS_REMOVE_rtc.o = -pg
|
||||
CFLAGS_REMOVE_paravirt.o = -pg
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||||
CFLAGS_REMOVE_paravirt-spinlocks.o = -pg
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||||
endif
|
||||
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||||
#
|
||||
|
@ -89,7 +89,7 @@ obj-$(CONFIG_DEBUG_NX_TEST) += test_nx.o
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|||
obj-$(CONFIG_VMI) += vmi_32.o vmiclock_32.o
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||||
obj-$(CONFIG_KVM_GUEST) += kvm.o
|
||||
obj-$(CONFIG_KVM_CLOCK) += kvmclock.o
|
||||
obj-$(CONFIG_PARAVIRT) += paravirt.o paravirt_patch_$(BITS).o
|
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obj-$(CONFIG_PARAVIRT) += paravirt.o paravirt_patch_$(BITS).o paravirt-spinlocks.o
|
||||
obj-$(CONFIG_PARAVIRT_CLOCK) += pvclock.o
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||||
|
||||
obj-$(CONFIG_PCSPKR_PLATFORM) += pcspeaker.o
|
||||
|
|
31
arch/x86/kernel/paravirt-spinlocks.c
Normal file
31
arch/x86/kernel/paravirt-spinlocks.c
Normal file
|
@ -0,0 +1,31 @@
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|||
/*
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* Split spinlock implementation out into its own file, so it can be
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* compiled in a FTRACE-compatible way.
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*/
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <asm/paravirt.h>
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struct pv_lock_ops pv_lock_ops = {
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#ifdef CONFIG_SMP
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.spin_is_locked = __ticket_spin_is_locked,
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.spin_is_contended = __ticket_spin_is_contended,
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.spin_lock = __ticket_spin_lock,
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.spin_trylock = __ticket_spin_trylock,
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.spin_unlock = __ticket_spin_unlock,
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#endif
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};
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EXPORT_SYMBOL_GPL(pv_lock_ops);
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void __init paravirt_use_bytelocks(void)
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{
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#ifdef CONFIG_SMP
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pv_lock_ops.spin_is_locked = __byte_spin_is_locked;
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pv_lock_ops.spin_is_contended = __byte_spin_is_contended;
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pv_lock_ops.spin_lock = __byte_spin_lock;
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pv_lock_ops.spin_trylock = __byte_spin_trylock;
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pv_lock_ops.spin_unlock = __byte_spin_unlock;
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#endif
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}
|
|
@ -268,17 +268,6 @@ enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
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|||
return __get_cpu_var(paravirt_lazy_mode);
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}
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|
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void __init paravirt_use_bytelocks(void)
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{
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#ifdef CONFIG_SMP
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pv_lock_ops.spin_is_locked = __byte_spin_is_locked;
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pv_lock_ops.spin_is_contended = __byte_spin_is_contended;
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pv_lock_ops.spin_lock = __byte_spin_lock;
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pv_lock_ops.spin_trylock = __byte_spin_trylock;
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pv_lock_ops.spin_unlock = __byte_spin_unlock;
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#endif
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}
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||||
struct pv_info pv_info = {
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.name = "bare hardware",
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.paravirt_enabled = 0,
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|
@ -465,18 +454,6 @@ struct pv_mmu_ops pv_mmu_ops = {
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.set_fixmap = native_set_fixmap,
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};
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|
||||
struct pv_lock_ops pv_lock_ops = {
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#ifdef CONFIG_SMP
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.spin_is_locked = __ticket_spin_is_locked,
|
||||
.spin_is_contended = __ticket_spin_is_contended,
|
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|
||||
.spin_lock = __ticket_spin_lock,
|
||||
.spin_trylock = __ticket_spin_trylock,
|
||||
.spin_unlock = __ticket_spin_unlock,
|
||||
#endif
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(pv_lock_ops);
|
||||
|
||||
EXPORT_SYMBOL_GPL(pv_time_ops);
|
||||
EXPORT_SYMBOL (pv_cpu_ops);
|
||||
EXPORT_SYMBOL (pv_mmu_ops);
|
||||
|
|
|
@ -1,4 +1,10 @@
|
|||
ifdef CONFIG_FTRACE
|
||||
# Do not profile debug and lowlevel utilities
|
||||
CFLAGS_REMOVE_spinlock.o = -pg
|
||||
CFLAGS_REMOVE_time.o = -pg
|
||||
endif
|
||||
|
||||
obj-y := enlighten.o setup.o multicalls.o mmu.o \
|
||||
time.o xen-asm_$(BITS).o grant-table.o suspend.o
|
||||
|
||||
obj-$(CONFIG_SMP) += smp.o
|
||||
obj-$(CONFIG_SMP) += smp.o spinlock.o
|
||||
|
|
|
@ -15,7 +15,6 @@
|
|||
* This does not handle HOTPLUG_CPU yet.
|
||||
*/
|
||||
#include <linux/sched.h>
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#include <linux/kernel_stat.h>
|
||||
#include <linux/err.h>
|
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#include <linux/smp.h>
|
||||
|
||||
|
@ -36,8 +35,6 @@
|
|||
#include "xen-ops.h"
|
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#include "mmu.h"
|
||||
|
||||
static void __cpuinit xen_init_lock_cpu(int cpu);
|
||||
|
||||
cpumask_t xen_cpu_initialized_map;
|
||||
|
||||
static DEFINE_PER_CPU(int, resched_irq);
|
||||
|
@ -419,170 +416,6 @@ static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
|
|||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
struct xen_spinlock {
|
||||
unsigned char lock; /* 0 -> free; 1 -> locked */
|
||||
unsigned short spinners; /* count of waiting cpus */
|
||||
};
|
||||
|
||||
static int xen_spin_is_locked(struct raw_spinlock *lock)
|
||||
{
|
||||
struct xen_spinlock *xl = (struct xen_spinlock *)lock;
|
||||
|
||||
return xl->lock != 0;
|
||||
}
|
||||
|
||||
static int xen_spin_is_contended(struct raw_spinlock *lock)
|
||||
{
|
||||
struct xen_spinlock *xl = (struct xen_spinlock *)lock;
|
||||
|
||||
/* Not strictly true; this is only the count of contended
|
||||
lock-takers entering the slow path. */
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return xl->spinners != 0;
|
||||
}
|
||||
|
||||
static int xen_spin_trylock(struct raw_spinlock *lock)
|
||||
{
|
||||
struct xen_spinlock *xl = (struct xen_spinlock *)lock;
|
||||
u8 old = 1;
|
||||
|
||||
asm("xchgb %b0,%1"
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||||
: "+q" (old), "+m" (xl->lock) : : "memory");
|
||||
|
||||
return old == 0;
|
||||
}
|
||||
|
||||
static DEFINE_PER_CPU(int, lock_kicker_irq) = -1;
|
||||
static DEFINE_PER_CPU(struct xen_spinlock *, lock_spinners);
|
||||
|
||||
static inline void spinning_lock(struct xen_spinlock *xl)
|
||||
{
|
||||
__get_cpu_var(lock_spinners) = xl;
|
||||
wmb(); /* set lock of interest before count */
|
||||
asm(LOCK_PREFIX " incw %0"
|
||||
: "+m" (xl->spinners) : : "memory");
|
||||
}
|
||||
|
||||
static inline void unspinning_lock(struct xen_spinlock *xl)
|
||||
{
|
||||
asm(LOCK_PREFIX " decw %0"
|
||||
: "+m" (xl->spinners) : : "memory");
|
||||
wmb(); /* decrement count before clearing lock */
|
||||
__get_cpu_var(lock_spinners) = NULL;
|
||||
}
|
||||
|
||||
static noinline int xen_spin_lock_slow(struct raw_spinlock *lock)
|
||||
{
|
||||
struct xen_spinlock *xl = (struct xen_spinlock *)lock;
|
||||
int irq = __get_cpu_var(lock_kicker_irq);
|
||||
int ret;
|
||||
|
||||
/* If kicker interrupts not initialized yet, just spin */
|
||||
if (irq == -1)
|
||||
return 0;
|
||||
|
||||
/* announce we're spinning */
|
||||
spinning_lock(xl);
|
||||
|
||||
/* clear pending */
|
||||
xen_clear_irq_pending(irq);
|
||||
|
||||
/* check again make sure it didn't become free while
|
||||
we weren't looking */
|
||||
ret = xen_spin_trylock(lock);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
/* block until irq becomes pending */
|
||||
xen_poll_irq(irq);
|
||||
kstat_this_cpu.irqs[irq]++;
|
||||
|
||||
out:
|
||||
unspinning_lock(xl);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void xen_spin_lock(struct raw_spinlock *lock)
|
||||
{
|
||||
struct xen_spinlock *xl = (struct xen_spinlock *)lock;
|
||||
int timeout;
|
||||
u8 oldval;
|
||||
|
||||
do {
|
||||
timeout = 1 << 10;
|
||||
|
||||
asm("1: xchgb %1,%0\n"
|
||||
" testb %1,%1\n"
|
||||
" jz 3f\n"
|
||||
"2: rep;nop\n"
|
||||
" cmpb $0,%0\n"
|
||||
" je 1b\n"
|
||||
" dec %2\n"
|
||||
" jnz 2b\n"
|
||||
"3:\n"
|
||||
: "+m" (xl->lock), "=q" (oldval), "+r" (timeout)
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||||
: "1" (1)
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||||
: "memory");
|
||||
|
||||
} while (unlikely(oldval != 0 && !xen_spin_lock_slow(lock)));
|
||||
}
|
||||
|
||||
static noinline void xen_spin_unlock_slow(struct xen_spinlock *xl)
|
||||
{
|
||||
int cpu;
|
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|
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for_each_online_cpu(cpu) {
|
||||
/* XXX should mix up next cpu selection */
|
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if (per_cpu(lock_spinners, cpu) == xl) {
|
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xen_send_IPI_one(cpu, XEN_SPIN_UNLOCK_VECTOR);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void xen_spin_unlock(struct raw_spinlock *lock)
|
||||
{
|
||||
struct xen_spinlock *xl = (struct xen_spinlock *)lock;
|
||||
|
||||
smp_wmb(); /* make sure no writes get moved after unlock */
|
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xl->lock = 0; /* release lock */
|
||||
|
||||
/* make sure unlock happens before kick */
|
||||
barrier();
|
||||
|
||||
if (unlikely(xl->spinners))
|
||||
xen_spin_unlock_slow(xl);
|
||||
}
|
||||
|
||||
static __cpuinit void xen_init_lock_cpu(int cpu)
|
||||
{
|
||||
int irq;
|
||||
const char *name;
|
||||
|
||||
name = kasprintf(GFP_KERNEL, "spinlock%d", cpu);
|
||||
irq = bind_ipi_to_irqhandler(XEN_SPIN_UNLOCK_VECTOR,
|
||||
cpu,
|
||||
xen_reschedule_interrupt,
|
||||
IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
|
||||
name,
|
||||
NULL);
|
||||
|
||||
if (irq >= 0) {
|
||||
disable_irq(irq); /* make sure it's never delivered */
|
||||
per_cpu(lock_kicker_irq, cpu) = irq;
|
||||
}
|
||||
|
||||
printk("cpu %d spinlock event irq %d\n", cpu, irq);
|
||||
}
|
||||
|
||||
static void __init xen_init_spinlocks(void)
|
||||
{
|
||||
pv_lock_ops.spin_is_locked = xen_spin_is_locked;
|
||||
pv_lock_ops.spin_is_contended = xen_spin_is_contended;
|
||||
pv_lock_ops.spin_lock = xen_spin_lock;
|
||||
pv_lock_ops.spin_trylock = xen_spin_trylock;
|
||||
pv_lock_ops.spin_unlock = xen_spin_unlock;
|
||||
}
|
||||
|
||||
static const struct smp_ops xen_smp_ops __initdata = {
|
||||
.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
|
||||
.smp_prepare_cpus = xen_smp_prepare_cpus,
|
||||
|
|
183
arch/x86/xen/spinlock.c
Normal file
183
arch/x86/xen/spinlock.c
Normal file
|
@ -0,0 +1,183 @@
|
|||
/*
|
||||
* Split spinlock implementation out into its own file, so it can be
|
||||
* compiled in a FTRACE-compatible way.
|
||||
*/
|
||||
#include <linux/kernel_stat.h>
|
||||
#include <linux/spinlock.h>
|
||||
|
||||
#include <asm/paravirt.h>
|
||||
|
||||
#include <xen/interface/xen.h>
|
||||
#include <xen/events.h>
|
||||
|
||||
#include "xen-ops.h"
|
||||
|
||||
struct xen_spinlock {
|
||||
unsigned char lock; /* 0 -> free; 1 -> locked */
|
||||
unsigned short spinners; /* count of waiting cpus */
|
||||
};
|
||||
|
||||
static int xen_spin_is_locked(struct raw_spinlock *lock)
|
||||
{
|
||||
struct xen_spinlock *xl = (struct xen_spinlock *)lock;
|
||||
|
||||
return xl->lock != 0;
|
||||
}
|
||||
|
||||
static int xen_spin_is_contended(struct raw_spinlock *lock)
|
||||
{
|
||||
struct xen_spinlock *xl = (struct xen_spinlock *)lock;
|
||||
|
||||
/* Not strictly true; this is only the count of contended
|
||||
lock-takers entering the slow path. */
|
||||
return xl->spinners != 0;
|
||||
}
|
||||
|
||||
static int xen_spin_trylock(struct raw_spinlock *lock)
|
||||
{
|
||||
struct xen_spinlock *xl = (struct xen_spinlock *)lock;
|
||||
u8 old = 1;
|
||||
|
||||
asm("xchgb %b0,%1"
|
||||
: "+q" (old), "+m" (xl->lock) : : "memory");
|
||||
|
||||
return old == 0;
|
||||
}
|
||||
|
||||
static DEFINE_PER_CPU(int, lock_kicker_irq) = -1;
|
||||
static DEFINE_PER_CPU(struct xen_spinlock *, lock_spinners);
|
||||
|
||||
static inline void spinning_lock(struct xen_spinlock *xl)
|
||||
{
|
||||
__get_cpu_var(lock_spinners) = xl;
|
||||
wmb(); /* set lock of interest before count */
|
||||
asm(LOCK_PREFIX " incw %0"
|
||||
: "+m" (xl->spinners) : : "memory");
|
||||
}
|
||||
|
||||
static inline void unspinning_lock(struct xen_spinlock *xl)
|
||||
{
|
||||
asm(LOCK_PREFIX " decw %0"
|
||||
: "+m" (xl->spinners) : : "memory");
|
||||
wmb(); /* decrement count before clearing lock */
|
||||
__get_cpu_var(lock_spinners) = NULL;
|
||||
}
|
||||
|
||||
static noinline int xen_spin_lock_slow(struct raw_spinlock *lock)
|
||||
{
|
||||
struct xen_spinlock *xl = (struct xen_spinlock *)lock;
|
||||
int irq = __get_cpu_var(lock_kicker_irq);
|
||||
int ret;
|
||||
|
||||
/* If kicker interrupts not initialized yet, just spin */
|
||||
if (irq == -1)
|
||||
return 0;
|
||||
|
||||
/* announce we're spinning */
|
||||
spinning_lock(xl);
|
||||
|
||||
/* clear pending */
|
||||
xen_clear_irq_pending(irq);
|
||||
|
||||
/* check again make sure it didn't become free while
|
||||
we weren't looking */
|
||||
ret = xen_spin_trylock(lock);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
/* block until irq becomes pending */
|
||||
xen_poll_irq(irq);
|
||||
kstat_this_cpu.irqs[irq]++;
|
||||
|
||||
out:
|
||||
unspinning_lock(xl);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void xen_spin_lock(struct raw_spinlock *lock)
|
||||
{
|
||||
struct xen_spinlock *xl = (struct xen_spinlock *)lock;
|
||||
int timeout;
|
||||
u8 oldval;
|
||||
|
||||
do {
|
||||
timeout = 1 << 10;
|
||||
|
||||
asm("1: xchgb %1,%0\n"
|
||||
" testb %1,%1\n"
|
||||
" jz 3f\n"
|
||||
"2: rep;nop\n"
|
||||
" cmpb $0,%0\n"
|
||||
" je 1b\n"
|
||||
" dec %2\n"
|
||||
" jnz 2b\n"
|
||||
"3:\n"
|
||||
: "+m" (xl->lock), "=q" (oldval), "+r" (timeout)
|
||||
: "1" (1)
|
||||
: "memory");
|
||||
|
||||
} while (unlikely(oldval != 0 && !xen_spin_lock_slow(lock)));
|
||||
}
|
||||
|
||||
static noinline void xen_spin_unlock_slow(struct xen_spinlock *xl)
|
||||
{
|
||||
int cpu;
|
||||
|
||||
for_each_online_cpu(cpu) {
|
||||
/* XXX should mix up next cpu selection */
|
||||
if (per_cpu(lock_spinners, cpu) == xl) {
|
||||
xen_send_IPI_one(cpu, XEN_SPIN_UNLOCK_VECTOR);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void xen_spin_unlock(struct raw_spinlock *lock)
|
||||
{
|
||||
struct xen_spinlock *xl = (struct xen_spinlock *)lock;
|
||||
|
||||
smp_wmb(); /* make sure no writes get moved after unlock */
|
||||
xl->lock = 0; /* release lock */
|
||||
|
||||
/* make sure unlock happens before kick */
|
||||
barrier();
|
||||
|
||||
if (unlikely(xl->spinners))
|
||||
xen_spin_unlock_slow(xl);
|
||||
}
|
||||
|
||||
static irqreturn_t dummy_handler(int irq, void *dev_id)
|
||||
{
|
||||
BUG();
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
void __cpuinit xen_init_lock_cpu(int cpu)
|
||||
{
|
||||
int irq;
|
||||
const char *name;
|
||||
|
||||
name = kasprintf(GFP_KERNEL, "spinlock%d", cpu);
|
||||
irq = bind_ipi_to_irqhandler(XEN_SPIN_UNLOCK_VECTOR,
|
||||
cpu,
|
||||
dummy_handler,
|
||||
IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
|
||||
name,
|
||||
NULL);
|
||||
|
||||
if (irq >= 0) {
|
||||
disable_irq(irq); /* make sure it's never delivered */
|
||||
per_cpu(lock_kicker_irq, cpu) = irq;
|
||||
}
|
||||
|
||||
printk("cpu %d spinlock event irq %d\n", cpu, irq);
|
||||
}
|
||||
|
||||
void __init xen_init_spinlocks(void)
|
||||
{
|
||||
pv_lock_ops.spin_is_locked = xen_spin_is_locked;
|
||||
pv_lock_ops.spin_is_contended = xen_spin_is_contended;
|
||||
pv_lock_ops.spin_lock = xen_spin_lock;
|
||||
pv_lock_ops.spin_trylock = xen_spin_trylock;
|
||||
pv_lock_ops.spin_unlock = xen_spin_unlock;
|
||||
}
|
|
@ -50,6 +50,9 @@ void __init xen_setup_vcpu_info_placement(void);
|
|||
#ifdef CONFIG_SMP
|
||||
void xen_smp_init(void);
|
||||
|
||||
void __init xen_init_spinlocks(void);
|
||||
__cpuinit void xen_init_lock_cpu(int cpu);
|
||||
|
||||
extern cpumask_t xen_cpu_initialized_map;
|
||||
#else
|
||||
static inline void xen_smp_init(void) {}
|
||||
|
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Loading…
Reference in a new issue