* Based on QEMU and Xen.
*/
+#define pr_fmt(fmt) "pit: " fmt
+
#include <linux/kvm_host.h>
+#include <linux/slab.h>
#include "irq.h"
#include "i8254.h"
return kvm->arch.vpit->pit_state.channels[channel].gate;
}
+static s64 __kpit_elapsed(struct kvm *kvm)
+{
+ s64 elapsed;
+ ktime_t remaining;
+ struct kvm_kpit_state *ps = &kvm->arch.vpit->pit_state;
+
+ if (!ps->pit_timer.period)
+ return 0;
+
+ /*
+ * The Counter does not stop when it reaches zero. In
+ * Modes 0, 1, 4, and 5 the Counter ``wraps around'' to
+ * the highest count, either FFFF hex for binary counting
+ * or 9999 for BCD counting, and continues counting.
+ * Modes 2 and 3 are periodic; the Counter reloads
+ * itself with the initial count and continues counting
+ * from there.
+ */
+ remaining = hrtimer_get_remaining(&ps->pit_timer.timer);
+ elapsed = ps->pit_timer.period - ktime_to_ns(remaining);
+ elapsed = mod_64(elapsed, ps->pit_timer.period);
+
+ return elapsed;
+}
+
+static s64 kpit_elapsed(struct kvm *kvm, struct kvm_kpit_channel_state *c,
+ int channel)
+{
+ if (channel == 0)
+ return __kpit_elapsed(kvm);
+
+ return ktime_to_ns(ktime_sub(ktime_get(), c->count_load_time));
+}
+
static int pit_get_count(struct kvm *kvm, int channel)
{
struct kvm_kpit_channel_state *c =
WARN_ON(!mutex_is_locked(&kvm->arch.vpit->pit_state.lock));
- t = ktime_to_ns(ktime_sub(ktime_get(), c->count_load_time));
+ t = kpit_elapsed(kvm, c, channel);
d = muldiv64(t, KVM_PIT_FREQ, NSEC_PER_SEC);
switch (c->mode) {
WARN_ON(!mutex_is_locked(&kvm->arch.vpit->pit_state.lock));
- t = ktime_to_ns(ktime_sub(ktime_get(), c->count_load_time));
+ t = kpit_elapsed(kvm, c, channel);
d = muldiv64(t, KVM_PIT_FREQ, NSEC_PER_SEC);
switch (c->mode) {
}
}
-static int __pit_timer_fn(struct kvm_kpit_state *ps)
-{
- struct kvm_vcpu *vcpu0 = ps->pit->kvm->vcpus[0];
- struct kvm_kpit_timer *pt = &ps->pit_timer;
-
- if (!atomic_inc_and_test(&pt->pending))
- set_bit(KVM_REQ_PENDING_TIMER, &vcpu0->requests);
-
- if (vcpu0 && waitqueue_active(&vcpu0->wq))
- wake_up_interruptible(&vcpu0->wq);
-
- hrtimer_add_expires_ns(&pt->timer, pt->period);
- pt->scheduled = hrtimer_get_expires_ns(&pt->timer);
- if (pt->period)
- ps->channels[0].count_load_time = hrtimer_get_expires(&pt->timer);
-
- return (pt->period == 0 ? 0 : 1);
-}
-
int pit_has_pending_timer(struct kvm_vcpu *vcpu)
{
struct kvm_pit *pit = vcpu->kvm->arch.vpit;
- if (pit && vcpu->vcpu_id == 0 && pit->pit_state.irq_ack)
+ if (pit && kvm_vcpu_is_bsp(vcpu) && pit->pit_state.irq_ack)
return atomic_read(&pit->pit_state.pit_timer.pending);
return 0;
}
{
struct kvm_kpit_state *ps = container_of(kian, struct kvm_kpit_state,
irq_ack_notifier);
- spin_lock(&ps->inject_lock);
+ raw_spin_lock(&ps->inject_lock);
if (atomic_dec_return(&ps->pit_timer.pending) < 0)
atomic_inc(&ps->pit_timer.pending);
ps->irq_ack = 1;
- spin_unlock(&ps->inject_lock);
-}
-
-static enum hrtimer_restart pit_timer_fn(struct hrtimer *data)
-{
- struct kvm_kpit_state *ps;
- int restart_timer = 0;
-
- ps = container_of(data, struct kvm_kpit_state, pit_timer.timer);
-
- restart_timer = __pit_timer_fn(ps);
-
- if (restart_timer)
- return HRTIMER_RESTART;
- else
- return HRTIMER_NORESTART;
+ raw_spin_unlock(&ps->inject_lock);
}
void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu)
struct kvm_pit *pit = vcpu->kvm->arch.vpit;
struct hrtimer *timer;
- if (vcpu->vcpu_id != 0 || !pit)
+ if (!kvm_vcpu_is_bsp(vcpu) || !pit)
return;
timer = &pit->pit_state.pit_timer.timer;
hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
}
-static void destroy_pit_timer(struct kvm_kpit_timer *pt)
+static void destroy_pit_timer(struct kvm_timer *pt)
{
- pr_debug("pit: execute del timer!\n");
+ pr_debug("execute del timer!\n");
hrtimer_cancel(&pt->timer);
}
+static bool kpit_is_periodic(struct kvm_timer *ktimer)
+{
+ struct kvm_kpit_state *ps = container_of(ktimer, struct kvm_kpit_state,
+ pit_timer);
+ return ps->is_periodic;
+}
+
+static struct kvm_timer_ops kpit_ops = {
+ .is_periodic = kpit_is_periodic,
+};
+
static void create_pit_timer(struct kvm_kpit_state *ps, u32 val, int is_period)
{
- struct kvm_kpit_timer *pt = &ps->pit_timer;
+ struct kvm_timer *pt = &ps->pit_timer;
s64 interval;
interval = muldiv64(val, NSEC_PER_SEC, KVM_PIT_FREQ);
- pr_debug("pit: create pit timer, interval is %llu nsec\n", interval);
+ pr_debug("create pit timer, interval is %llu nsec\n", interval);
/* TODO The new value only affected after the retriggered */
hrtimer_cancel(&pt->timer);
- pt->period = (is_period == 0) ? 0 : interval;
- pt->timer.function = pit_timer_fn;
+ pt->period = interval;
+ ps->is_periodic = is_period;
+
+ pt->timer.function = kvm_timer_fn;
+ pt->t_ops = &kpit_ops;
+ pt->kvm = ps->pit->kvm;
+ pt->vcpu = pt->kvm->bsp_vcpu;
+
atomic_set(&pt->pending, 0);
ps->irq_ack = 1;
WARN_ON(!mutex_is_locked(&ps->lock));
- pr_debug("pit: load_count val is %d, channel is %d\n", val, channel);
+ pr_debug("load_count val is %d, channel is %d\n", val, channel);
/*
- * Though spec said the state of 8254 is undefined after power-up,
- * seems some tricky OS like Windows XP depends on IRQ0 interrupt
- * when booting up.
- * So here setting initialize rate for it, and not a specific number
+ * The largest possible initial count is 0; this is equivalent
+ * to 216 for binary counting and 104 for BCD counting.
*/
if (val == 0)
val = 0x10000;
- ps->channels[channel].count_load_time = ktime_get();
ps->channels[channel].count = val;
- if (channel != 0)
+ if (channel != 0) {
+ ps->channels[channel].count_load_time = ktime_get();
return;
+ }
/* Two types of timer
* mode 1 is one shot, mode 2 is period, otherwise del timer */
switch (ps->channels[0].mode) {
+ case 0:
case 1:
/* FIXME: enhance mode 4 precision */
case 4:
- create_pit_timer(ps, val, 0);
+ if (!(ps->flags & KVM_PIT_FLAGS_HPET_LEGACY)) {
+ create_pit_timer(ps, val, 0);
+ }
break;
case 2:
case 3:
- create_pit_timer(ps, val, 1);
+ if (!(ps->flags & KVM_PIT_FLAGS_HPET_LEGACY)){
+ create_pit_timer(ps, val, 1);
+ }
break;
default:
destroy_pit_timer(&ps->pit_timer);
}
}
-void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val)
+void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start)
+{
+ u8 saved_mode;
+ if (hpet_legacy_start) {
+ /* save existing mode for later reenablement */
+ saved_mode = kvm->arch.vpit->pit_state.channels[0].mode;
+ kvm->arch.vpit->pit_state.channels[0].mode = 0xff; /* disable timer */
+ pit_load_count(kvm, channel, val);
+ kvm->arch.vpit->pit_state.channels[0].mode = saved_mode;
+ } else {
+ pit_load_count(kvm, channel, val);
+ }
+}
+
+static inline struct kvm_pit *dev_to_pit(struct kvm_io_device *dev)
+{
+ return container_of(dev, struct kvm_pit, dev);
+}
+
+static inline struct kvm_pit *speaker_to_pit(struct kvm_io_device *dev)
{
- mutex_lock(&kvm->arch.vpit->pit_state.lock);
- pit_load_count(kvm, channel, val);
- mutex_unlock(&kvm->arch.vpit->pit_state.lock);
+ return container_of(dev, struct kvm_pit, speaker_dev);
}
-static void pit_ioport_write(struct kvm_io_device *this,
- gpa_t addr, int len, const void *data)
+static inline int pit_in_range(gpa_t addr)
{
- struct kvm_pit *pit = (struct kvm_pit *)this->private;
+ return ((addr >= KVM_PIT_BASE_ADDRESS) &&
+ (addr < KVM_PIT_BASE_ADDRESS + KVM_PIT_MEM_LENGTH));
+}
+
+static int pit_ioport_write(struct kvm_io_device *this,
+ gpa_t addr, int len, const void *data)
+{
+ struct kvm_pit *pit = dev_to_pit(this);
struct kvm_kpit_state *pit_state = &pit->pit_state;
struct kvm *kvm = pit->kvm;
int channel, access;
struct kvm_kpit_channel_state *s;
u32 val = *(u32 *) data;
+ if (!pit_in_range(addr))
+ return -EOPNOTSUPP;
val &= 0xff;
addr &= KVM_PIT_CHANNEL_MASK;
mutex_lock(&pit_state->lock);
if (val != 0)
- pr_debug("pit: write addr is 0x%x, len is %d, val is 0x%x\n",
- (unsigned int)addr, len, val);
+ pr_debug("write addr is 0x%x, len is %d, val is 0x%x\n",
+ (unsigned int)addr, len, val);
if (addr == 3) {
channel = val >> 6;
}
mutex_unlock(&pit_state->lock);
+ return 0;
}
-static void pit_ioport_read(struct kvm_io_device *this,
- gpa_t addr, int len, void *data)
+static int pit_ioport_read(struct kvm_io_device *this,
+ gpa_t addr, int len, void *data)
{
- struct kvm_pit *pit = (struct kvm_pit *)this->private;
+ struct kvm_pit *pit = dev_to_pit(this);
struct kvm_kpit_state *pit_state = &pit->pit_state;
struct kvm *kvm = pit->kvm;
int ret, count;
struct kvm_kpit_channel_state *s;
+ if (!pit_in_range(addr))
+ return -EOPNOTSUPP;
addr &= KVM_PIT_CHANNEL_MASK;
+ if (addr == 3)
+ return 0;
+
s = &pit_state->channels[addr];
mutex_lock(&pit_state->lock);
memcpy(data, (char *)&ret, len);
mutex_unlock(&pit_state->lock);
+ return 0;
}
-static int pit_in_range(struct kvm_io_device *this, gpa_t addr,
- int len, int is_write)
-{
- return ((addr >= KVM_PIT_BASE_ADDRESS) &&
- (addr < KVM_PIT_BASE_ADDRESS + KVM_PIT_MEM_LENGTH));
-}
-
-static void speaker_ioport_write(struct kvm_io_device *this,
- gpa_t addr, int len, const void *data)
+static int speaker_ioport_write(struct kvm_io_device *this,
+ gpa_t addr, int len, const void *data)
{
- struct kvm_pit *pit = (struct kvm_pit *)this->private;
+ struct kvm_pit *pit = speaker_to_pit(this);
struct kvm_kpit_state *pit_state = &pit->pit_state;
struct kvm *kvm = pit->kvm;
u32 val = *(u32 *) data;
+ if (addr != KVM_SPEAKER_BASE_ADDRESS)
+ return -EOPNOTSUPP;
mutex_lock(&pit_state->lock);
pit_state->speaker_data_on = (val >> 1) & 1;
pit_set_gate(kvm, 2, val & 1);
mutex_unlock(&pit_state->lock);
+ return 0;
}
-static void speaker_ioport_read(struct kvm_io_device *this,
- gpa_t addr, int len, void *data)
+static int speaker_ioport_read(struct kvm_io_device *this,
+ gpa_t addr, int len, void *data)
{
- struct kvm_pit *pit = (struct kvm_pit *)this->private;
+ struct kvm_pit *pit = speaker_to_pit(this);
struct kvm_kpit_state *pit_state = &pit->pit_state;
struct kvm *kvm = pit->kvm;
unsigned int refresh_clock;
int ret;
+ if (addr != KVM_SPEAKER_BASE_ADDRESS)
+ return -EOPNOTSUPP;
/* Refresh clock toggles at about 15us. We approximate as 2^14ns. */
refresh_clock = ((unsigned int)ktime_to_ns(ktime_get()) >> 14) & 1;
len = sizeof(ret);
memcpy(data, (char *)&ret, len);
mutex_unlock(&pit_state->lock);
-}
-
-static int speaker_in_range(struct kvm_io_device *this, gpa_t addr,
- int len, int is_write)
-{
- return (addr == KVM_SPEAKER_BASE_ADDRESS);
+ return 0;
}
void kvm_pit_reset(struct kvm_pit *pit)
struct kvm_kpit_channel_state *c;
mutex_lock(&pit->pit_state.lock);
+ pit->pit_state.flags = 0;
for (i = 0; i < 3; i++) {
c = &pit->pit_state.channels[i];
c->mode = 0xff;
pit->pit_state.irq_ack = 1;
}
-struct kvm_pit *kvm_create_pit(struct kvm *kvm)
+static void pit_mask_notifer(struct kvm_irq_mask_notifier *kimn, bool mask)
+{
+ struct kvm_pit *pit = container_of(kimn, struct kvm_pit, mask_notifier);
+
+ if (!mask) {
+ atomic_set(&pit->pit_state.pit_timer.pending, 0);
+ pit->pit_state.irq_ack = 1;
+ }
+}
+
+static const struct kvm_io_device_ops pit_dev_ops = {
+ .read = pit_ioport_read,
+ .write = pit_ioport_write,
+};
+
+static const struct kvm_io_device_ops speaker_dev_ops = {
+ .read = speaker_ioport_read,
+ .write = speaker_ioport_write,
+};
+
+/* Caller must hold slots_lock */
+struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags)
{
struct kvm_pit *pit;
struct kvm_kpit_state *pit_state;
+ int ret;
pit = kzalloc(sizeof(struct kvm_pit), GFP_KERNEL);
if (!pit)
return NULL;
- mutex_lock(&kvm->lock);
pit->irq_source_id = kvm_request_irq_source_id(kvm);
- mutex_unlock(&kvm->lock);
if (pit->irq_source_id < 0) {
kfree(pit);
return NULL;
mutex_init(&pit->pit_state.lock);
mutex_lock(&pit->pit_state.lock);
- spin_lock_init(&pit->pit_state.inject_lock);
-
- /* Initialize PIO device */
- pit->dev.read = pit_ioport_read;
- pit->dev.write = pit_ioport_write;
- pit->dev.in_range = pit_in_range;
- pit->dev.private = pit;
- kvm_io_bus_register_dev(&kvm->pio_bus, &pit->dev);
-
- pit->speaker_dev.read = speaker_ioport_read;
- pit->speaker_dev.write = speaker_ioport_write;
- pit->speaker_dev.in_range = speaker_in_range;
- pit->speaker_dev.private = pit;
- kvm_io_bus_register_dev(&kvm->pio_bus, &pit->speaker_dev);
+ raw_spin_lock_init(&pit->pit_state.inject_lock);
kvm->arch.vpit = pit;
pit->kvm = kvm;
pit_state->irq_ack_notifier.gsi = 0;
pit_state->irq_ack_notifier.irq_acked = kvm_pit_ack_irq;
kvm_register_irq_ack_notifier(kvm, &pit_state->irq_ack_notifier);
+ pit_state->pit_timer.reinject = true;
mutex_unlock(&pit->pit_state.lock);
kvm_pit_reset(pit);
+ pit->mask_notifier.func = pit_mask_notifer;
+ kvm_register_irq_mask_notifier(kvm, 0, &pit->mask_notifier);
+
+ kvm_iodevice_init(&pit->dev, &pit_dev_ops);
+ ret = kvm_io_bus_register_dev(kvm, KVM_PIO_BUS, &pit->dev);
+ if (ret < 0)
+ goto fail;
+
+ if (flags & KVM_PIT_SPEAKER_DUMMY) {
+ kvm_iodevice_init(&pit->speaker_dev, &speaker_dev_ops);
+ ret = kvm_io_bus_register_dev(kvm, KVM_PIO_BUS,
+ &pit->speaker_dev);
+ if (ret < 0)
+ goto fail_unregister;
+ }
+
return pit;
+
+fail_unregister:
+ kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &pit->dev);
+
+fail:
+ kvm_unregister_irq_mask_notifier(kvm, 0, &pit->mask_notifier);
+ kvm_unregister_irq_ack_notifier(kvm, &pit_state->irq_ack_notifier);
+ kvm_free_irq_source_id(kvm, pit->irq_source_id);
+
+ kfree(pit);
+ return NULL;
}
void kvm_free_pit(struct kvm *kvm)
struct hrtimer *timer;
if (kvm->arch.vpit) {
+ kvm_unregister_irq_mask_notifier(kvm, 0,
+ &kvm->arch.vpit->mask_notifier);
+ kvm_unregister_irq_ack_notifier(kvm,
+ &kvm->arch.vpit->pit_state.irq_ack_notifier);
mutex_lock(&kvm->arch.vpit->pit_state.lock);
timer = &kvm->arch.vpit->pit_state.pit_timer.timer;
hrtimer_cancel(timer);
struct kvm_vcpu *vcpu;
int i;
- mutex_lock(&kvm->lock);
kvm_set_irq(kvm, kvm->arch.vpit->irq_source_id, 0, 1);
kvm_set_irq(kvm, kvm->arch.vpit->irq_source_id, 0, 0);
- mutex_unlock(&kvm->lock);
/*
* Provides NMI watchdog support via Virtual Wire mode.
* VCPU0, and only if its LVT0 is in EXTINT mode.
*/
if (kvm->arch.vapics_in_nmi_mode > 0)
- for (i = 0; i < KVM_MAX_VCPUS; ++i) {
- vcpu = kvm->vcpus[i];
- if (vcpu)
- kvm_apic_nmi_wd_deliver(vcpu);
- }
+ kvm_for_each_vcpu(i, vcpu, kvm)
+ kvm_apic_nmi_wd_deliver(vcpu);
}
void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu)
struct kvm *kvm = vcpu->kvm;
struct kvm_kpit_state *ps;
- if (vcpu && pit) {
+ if (pit) {
int inject = 0;
ps = &pit->pit_state;
/* Try to inject pending interrupts when
* last one has been acked.
*/
- spin_lock(&ps->inject_lock);
+ raw_spin_lock(&ps->inject_lock);
if (atomic_read(&ps->pit_timer.pending) && ps->irq_ack) {
ps->irq_ack = 0;
inject = 1;
}
- spin_unlock(&ps->inject_lock);
+ raw_spin_unlock(&ps->inject_lock);
if (inject)
__inject_pit_timer_intr(kvm);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff