* 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"
* itself with the initial count and continues counting
* from there.
*/
- remaining = hrtimer_expires_remaining(&ps->pit_timer.timer);
+ 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);
{
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);
+ raw_spin_unlock(&ps->inject_lock);
}
void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu)
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);
}
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);
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);
/*
* The largest possible initial count is 0; this is equivalent
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)
{
- mutex_lock(&kvm->arch.vpit->pit_state.lock);
- pit_load_count(kvm, channel, val);
- mutex_unlock(&kvm->arch.vpit->pit_state.lock);
+ 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, 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)
+{
+ 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;
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 = 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 = 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 = 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;
static const struct kvm_io_device_ops pit_dev_ops = {
.read = pit_ioport_read,
.write = pit_ioport_write,
- .in_range = pit_in_range,
};
static const struct kvm_io_device_ops speaker_dev_ops = {
.read = speaker_ioport_read,
.write = speaker_ioport_write,
- .in_range = speaker_in_range,
};
+/* 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)
mutex_init(&pit->pit_state.lock);
mutex_lock(&pit->pit_state.lock);
- spin_lock_init(&pit->pit_state.inject_lock);
+ raw_spin_lock_init(&pit->pit_state.inject_lock);
kvm->arch.vpit = pit;
pit->kvm = kvm;
kvm_register_irq_mask_notifier(kvm, 0, &pit->mask_notifier);
kvm_iodevice_init(&pit->dev, &pit_dev_ops);
- kvm_io_bus_register_dev(&kvm->pio_bus, &pit->dev);
+ 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);
- kvm_io_bus_register_dev(&kvm->pio_bus, &pit->speaker_dev);
+ 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)
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->irq_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->irq_lock);
/*
* Provides NMI watchdog support via Virtual Wire mode.
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