diff options
Diffstat (limited to 'qemu/hw/i386/kvm/i8254.c')
-rw-r--r-- | qemu/hw/i386/kvm/i8254.c | 337 |
1 files changed, 0 insertions, 337 deletions
diff --git a/qemu/hw/i386/kvm/i8254.c b/qemu/hw/i386/kvm/i8254.c deleted file mode 100644 index a4462e5ca..000000000 --- a/qemu/hw/i386/kvm/i8254.c +++ /dev/null @@ -1,337 +0,0 @@ -/* - * KVM in-kernel PIT (i8254) support - * - * Copyright (c) 2003-2004 Fabrice Bellard - * Copyright (c) 2012 Jan Kiszka, Siemens AG - * - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL - * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN - * THE SOFTWARE. - */ -#include "qemu/osdep.h" -#include "qapi/error.h" -#include "qemu/timer.h" -#include "sysemu/sysemu.h" -#include "hw/timer/i8254.h" -#include "hw/timer/i8254_internal.h" -#include "sysemu/kvm.h" - -#define KVM_PIT_REINJECT_BIT 0 - -#define CALIBRATION_ROUNDS 3 - -#define KVM_PIT(obj) OBJECT_CHECK(KVMPITState, (obj), TYPE_KVM_I8254) -#define KVM_PIT_CLASS(class) \ - OBJECT_CLASS_CHECK(KVMPITClass, (class), TYPE_KVM_I8254) -#define KVM_PIT_GET_CLASS(obj) \ - OBJECT_GET_CLASS(KVMPITClass, (obj), TYPE_KVM_I8254) - -typedef struct KVMPITState { - PITCommonState parent_obj; - - LostTickPolicy lost_tick_policy; - bool vm_stopped; - int64_t kernel_clock_offset; -} KVMPITState; - -typedef struct KVMPITClass { - PITCommonClass parent_class; - - DeviceRealize parent_realize; -} KVMPITClass; - -static int64_t abs64(int64_t v) -{ - return v < 0 ? -v : v; -} - -static void kvm_pit_update_clock_offset(KVMPITState *s) -{ - int64_t offset, clock_offset; - struct timespec ts; - int i; - - /* - * Measure the delta between CLOCK_MONOTONIC, the base used for - * kvm_pit_channel_state::count_load_time, and QEMU_CLOCK_VIRTUAL. Take the - * minimum of several samples to filter out scheduling noise. - */ - clock_offset = INT64_MAX; - for (i = 0; i < CALIBRATION_ROUNDS; i++) { - offset = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); - clock_gettime(CLOCK_MONOTONIC, &ts); - offset -= ts.tv_nsec; - offset -= (int64_t)ts.tv_sec * 1000000000; - if (abs64(offset) < abs64(clock_offset)) { - clock_offset = offset; - } - } - s->kernel_clock_offset = clock_offset; -} - -static void kvm_pit_get(PITCommonState *pit) -{ - KVMPITState *s = KVM_PIT(pit); - struct kvm_pit_state2 kpit; - struct kvm_pit_channel_state *kchan; - struct PITChannelState *sc; - int i, ret; - - /* No need to re-read the state if VM is stopped. */ - if (s->vm_stopped) { - return; - } - - if (kvm_has_pit_state2()) { - ret = kvm_vm_ioctl(kvm_state, KVM_GET_PIT2, &kpit); - if (ret < 0) { - fprintf(stderr, "KVM_GET_PIT2 failed: %s\n", strerror(ret)); - abort(); - } - pit->channels[0].irq_disabled = kpit.flags & KVM_PIT_FLAGS_HPET_LEGACY; - } else { - /* - * kvm_pit_state2 is superset of kvm_pit_state struct, - * so we can use it for KVM_GET_PIT as well. - */ - ret = kvm_vm_ioctl(kvm_state, KVM_GET_PIT, &kpit); - if (ret < 0) { - fprintf(stderr, "KVM_GET_PIT failed: %s\n", strerror(ret)); - abort(); - } - } - for (i = 0; i < 3; i++) { - kchan = &kpit.channels[i]; - sc = &pit->channels[i]; - sc->count = kchan->count; - sc->latched_count = kchan->latched_count; - sc->count_latched = kchan->count_latched; - sc->status_latched = kchan->status_latched; - sc->status = kchan->status; - sc->read_state = kchan->read_state; - sc->write_state = kchan->write_state; - sc->write_latch = kchan->write_latch; - sc->rw_mode = kchan->rw_mode; - sc->mode = kchan->mode; - sc->bcd = kchan->bcd; - sc->gate = kchan->gate; - sc->count_load_time = kchan->count_load_time + s->kernel_clock_offset; - } - - sc = &pit->channels[0]; - sc->next_transition_time = - pit_get_next_transition_time(sc, sc->count_load_time); -} - -static void kvm_pit_put(PITCommonState *pit) -{ - KVMPITState *s = KVM_PIT(pit); - struct kvm_pit_state2 kpit = {}; - struct kvm_pit_channel_state *kchan; - struct PITChannelState *sc; - int i, ret; - - /* The offset keeps changing as long as the VM is stopped. */ - if (s->vm_stopped) { - kvm_pit_update_clock_offset(s); - } - - kpit.flags = pit->channels[0].irq_disabled ? KVM_PIT_FLAGS_HPET_LEGACY : 0; - for (i = 0; i < 3; i++) { - kchan = &kpit.channels[i]; - sc = &pit->channels[i]; - kchan->count = sc->count; - kchan->latched_count = sc->latched_count; - kchan->count_latched = sc->count_latched; - kchan->status_latched = sc->status_latched; - kchan->status = sc->status; - kchan->read_state = sc->read_state; - kchan->write_state = sc->write_state; - kchan->write_latch = sc->write_latch; - kchan->rw_mode = sc->rw_mode; - kchan->mode = sc->mode; - kchan->bcd = sc->bcd; - kchan->gate = sc->gate; - kchan->count_load_time = sc->count_load_time - s->kernel_clock_offset; - } - - ret = kvm_vm_ioctl(kvm_state, - kvm_has_pit_state2() ? KVM_SET_PIT2 : KVM_SET_PIT, - &kpit); - if (ret < 0) { - fprintf(stderr, "%s failed: %s\n", - kvm_has_pit_state2() ? "KVM_SET_PIT2" : "KVM_SET_PIT", - strerror(ret)); - abort(); - } -} - -static void kvm_pit_set_gate(PITCommonState *s, PITChannelState *sc, int val) -{ - kvm_pit_get(s); - - switch (sc->mode) { - default: - case 0: - case 4: - /* XXX: just disable/enable counting */ - break; - case 1: - case 2: - case 3: - case 5: - if (sc->gate < val) { - /* restart counting on rising edge */ - sc->count_load_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); - } - break; - } - sc->gate = val; - - kvm_pit_put(s); -} - -static void kvm_pit_get_channel_info(PITCommonState *s, PITChannelState *sc, - PITChannelInfo *info) -{ - kvm_pit_get(s); - - pit_get_channel_info_common(s, sc, info); -} - -static void kvm_pit_reset(DeviceState *dev) -{ - PITCommonState *s = PIT_COMMON(dev); - - pit_reset_common(s); - - kvm_pit_put(s); -} - -static void kvm_pit_irq_control(void *opaque, int n, int enable) -{ - PITCommonState *pit = opaque; - PITChannelState *s = &pit->channels[0]; - - kvm_pit_get(pit); - - s->irq_disabled = !enable; - - kvm_pit_put(pit); -} - -static void kvm_pit_vm_state_change(void *opaque, int running, - RunState state) -{ - KVMPITState *s = opaque; - - if (running) { - kvm_pit_update_clock_offset(s); - kvm_pit_put(PIT_COMMON(s)); - s->vm_stopped = false; - } else { - kvm_pit_update_clock_offset(s); - kvm_pit_get(PIT_COMMON(s)); - s->vm_stopped = true; - } -} - -static void kvm_pit_realizefn(DeviceState *dev, Error **errp) -{ - PITCommonState *pit = PIT_COMMON(dev); - KVMPITClass *kpc = KVM_PIT_GET_CLASS(dev); - KVMPITState *s = KVM_PIT(pit); - struct kvm_pit_config config = { - .flags = 0, - }; - int ret; - - if (kvm_check_extension(kvm_state, KVM_CAP_PIT2)) { - ret = kvm_vm_ioctl(kvm_state, KVM_CREATE_PIT2, &config); - } else { - ret = kvm_vm_ioctl(kvm_state, KVM_CREATE_PIT); - } - if (ret < 0) { - error_setg(errp, "Create kernel PIC irqchip failed: %s", - strerror(ret)); - return; - } - switch (s->lost_tick_policy) { - case LOST_TICK_POLICY_DELAY: - break; /* enabled by default */ - case LOST_TICK_POLICY_DISCARD: - if (kvm_check_extension(kvm_state, KVM_CAP_REINJECT_CONTROL)) { - struct kvm_reinject_control control = { .pit_reinject = 0 }; - - ret = kvm_vm_ioctl(kvm_state, KVM_REINJECT_CONTROL, &control); - if (ret < 0) { - error_setg(errp, - "Can't disable in-kernel PIT reinjection: %s", - strerror(ret)); - return; - } - } - break; - default: - error_setg(errp, "Lost tick policy not supported."); - return; - } - - memory_region_init_reservation(&pit->ioports, NULL, "kvm-pit", 4); - - qdev_init_gpio_in(dev, kvm_pit_irq_control, 1); - - qemu_add_vm_change_state_handler(kvm_pit_vm_state_change, s); - - kpc->parent_realize(dev, errp); -} - -static Property kvm_pit_properties[] = { - DEFINE_PROP_UINT32("iobase", PITCommonState, iobase, -1), - DEFINE_PROP_LOSTTICKPOLICY("lost_tick_policy", KVMPITState, - lost_tick_policy, LOST_TICK_POLICY_DELAY), - DEFINE_PROP_END_OF_LIST(), -}; - -static void kvm_pit_class_init(ObjectClass *klass, void *data) -{ - KVMPITClass *kpc = KVM_PIT_CLASS(klass); - PITCommonClass *k = PIT_COMMON_CLASS(klass); - DeviceClass *dc = DEVICE_CLASS(klass); - - kpc->parent_realize = dc->realize; - dc->realize = kvm_pit_realizefn; - k->set_channel_gate = kvm_pit_set_gate; - k->get_channel_info = kvm_pit_get_channel_info; - dc->reset = kvm_pit_reset; - dc->props = kvm_pit_properties; -} - -static const TypeInfo kvm_pit_info = { - .name = TYPE_KVM_I8254, - .parent = TYPE_PIT_COMMON, - .instance_size = sizeof(KVMPITState), - .class_init = kvm_pit_class_init, - .class_size = sizeof(KVMPITClass), -}; - -static void kvm_pit_register(void) -{ - type_register_static(&kvm_pit_info); -} - -type_init(kvm_pit_register) |