From: Radim Krčmář Date: Wed, 2 Mar 2016 21:56:43 +0000 (+0100) Subject: KVM: i8254: pass struct kvm_pit instead of kvm in PIT X-Git-Tag: v4.14-rc1~3659^2~29 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=09edea72b7f9fd8a8d26c1f7504d989b9773ee5e;p=platform%2Fkernel%2Flinux-rpi.git KVM: i8254: pass struct kvm_pit instead of kvm in PIT This patch passes struct kvm_pit into internal PIT functions. Those functions used to get PIT through kvm->arch.vpit, even though most of them never used *kvm for other purposes. Another benefit is that we don't need to set kvm->arch.vpit during initialization. Signed-off-by: Radim Krčmář Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c index e5a3e80..2afe09b0 100644 --- a/arch/x86/kvm/i8254.c +++ b/arch/x86/kvm/i8254.c @@ -71,10 +71,9 @@ static u64 muldiv64(u64 a, u32 b, u32 c) return res.ll; } -static void pit_set_gate(struct kvm *kvm, int channel, u32 val) +static void pit_set_gate(struct kvm_pit *pit, int channel, u32 val) { - struct kvm_kpit_channel_state *c = - &kvm->arch.vpit->pit_state.channels[channel]; + struct kvm_kpit_channel_state *c = &pit->pit_state.channels[channel]; switch (c->mode) { default: @@ -95,16 +94,16 @@ static void pit_set_gate(struct kvm *kvm, int channel, u32 val) c->gate = val; } -static int pit_get_gate(struct kvm *kvm, int channel) +static int pit_get_gate(struct kvm_pit *pit, int channel) { - return kvm->arch.vpit->pit_state.channels[channel].gate; + return pit->pit_state.channels[channel].gate; } -static s64 __kpit_elapsed(struct kvm *kvm) +static s64 __kpit_elapsed(struct kvm_pit *pit) { s64 elapsed; ktime_t remaining; - struct kvm_kpit_state *ps = &kvm->arch.vpit->pit_state; + struct kvm_kpit_state *ps = &pit->pit_state; if (!ps->period) return 0; @@ -124,23 +123,22 @@ static s64 __kpit_elapsed(struct kvm *kvm) return elapsed; } -static s64 kpit_elapsed(struct kvm *kvm, struct kvm_kpit_channel_state *c, +static s64 kpit_elapsed(struct kvm_pit *pit, struct kvm_kpit_channel_state *c, int channel) { if (channel == 0) - return __kpit_elapsed(kvm); + return __kpit_elapsed(pit); return ktime_to_ns(ktime_sub(ktime_get(), c->count_load_time)); } -static int pit_get_count(struct kvm *kvm, int channel) +static int pit_get_count(struct kvm_pit *pit, int channel) { - struct kvm_kpit_channel_state *c = - &kvm->arch.vpit->pit_state.channels[channel]; + struct kvm_kpit_channel_state *c = &pit->pit_state.channels[channel]; s64 d, t; int counter; - t = kpit_elapsed(kvm, c, channel); + t = kpit_elapsed(pit, c, channel); d = muldiv64(t, KVM_PIT_FREQ, NSEC_PER_SEC); switch (c->mode) { @@ -161,14 +159,13 @@ static int pit_get_count(struct kvm *kvm, int channel) return counter; } -static int pit_get_out(struct kvm *kvm, int channel) +static int pit_get_out(struct kvm_pit *pit, int channel) { - struct kvm_kpit_channel_state *c = - &kvm->arch.vpit->pit_state.channels[channel]; + struct kvm_kpit_channel_state *c = &pit->pit_state.channels[channel]; s64 d, t; int out; - t = kpit_elapsed(kvm, c, channel); + t = kpit_elapsed(pit, c, channel); d = muldiv64(t, KVM_PIT_FREQ, NSEC_PER_SEC); switch (c->mode) { @@ -194,25 +191,23 @@ static int pit_get_out(struct kvm *kvm, int channel) return out; } -static void pit_latch_count(struct kvm *kvm, int channel) +static void pit_latch_count(struct kvm_pit *pit, int channel) { - struct kvm_kpit_channel_state *c = - &kvm->arch.vpit->pit_state.channels[channel]; + struct kvm_kpit_channel_state *c = &pit->pit_state.channels[channel]; if (!c->count_latched) { - c->latched_count = pit_get_count(kvm, channel); + c->latched_count = pit_get_count(pit, channel); c->count_latched = c->rw_mode; } } -static void pit_latch_status(struct kvm *kvm, int channel) +static void pit_latch_status(struct kvm_pit *pit, int channel) { - struct kvm_kpit_channel_state *c = - &kvm->arch.vpit->pit_state.channels[channel]; + struct kvm_kpit_channel_state *c = &pit->pit_state.channels[channel]; if (!c->status_latched) { /* TODO: Return NULL COUNT (bit 6). */ - c->status = ((pit_get_out(kvm, channel) << 7) | + c->status = ((pit_get_out(pit, channel) << 7) | (c->rw_mode << 4) | (c->mode << 1) | c->bcd); @@ -306,9 +301,10 @@ static inline void kvm_pit_reset_reinject(struct kvm_pit *pit) atomic_set(&pit->pit_state.irq_ack, 1); } -static void create_pit_timer(struct kvm *kvm, u32 val, int is_period) +static void create_pit_timer(struct kvm_pit *pit, u32 val, int is_period) { - struct kvm_kpit_state *ps = &kvm->arch.vpit->pit_state; + struct kvm_kpit_state *ps = &pit->pit_state; + struct kvm *kvm = pit->kvm; s64 interval; if (!ioapic_in_kernel(kvm) || @@ -326,9 +322,9 @@ static void create_pit_timer(struct kvm *kvm, u32 val, int is_period) ps->is_periodic = is_period; ps->timer.function = pit_timer_fn; - ps->kvm = ps->pit->kvm; + ps->kvm = pit->kvm; - kvm_pit_reset_reinject(ps->pit); + kvm_pit_reset_reinject(pit); /* * Do not allow the guest to program periodic timers with small @@ -351,9 +347,9 @@ static void create_pit_timer(struct kvm *kvm, u32 val, int is_period) HRTIMER_MODE_ABS); } -static void pit_load_count(struct kvm *kvm, int channel, u32 val) +static void pit_load_count(struct kvm_pit *pit, int channel, u32 val) { - struct kvm_kpit_state *ps = &kvm->arch.vpit->pit_state; + struct kvm_kpit_state *ps = &pit->pit_state; pr_debug("load_count val is %d, channel is %d\n", val, channel); @@ -378,32 +374,33 @@ static void pit_load_count(struct kvm *kvm, int channel, u32 val) case 1: /* FIXME: enhance mode 4 precision */ case 4: - create_pit_timer(kvm, val, 0); + create_pit_timer(pit, val, 0); break; case 2: case 3: - create_pit_timer(kvm, val, 1); + create_pit_timer(pit, val, 1); break; default: - destroy_pit_timer(kvm->arch.vpit); + destroy_pit_timer(pit); } } -void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start) +void kvm_pit_load_count(struct kvm_pit *pit, int channel, u32 val, + int hpet_legacy_start) { u8 saved_mode; - WARN_ON_ONCE(!mutex_is_locked(&kvm->arch.vpit->pit_state.lock)); + WARN_ON_ONCE(!mutex_is_locked(&pit->pit_state.lock)); if (hpet_legacy_start) { /* save existing mode for later reenablement */ WARN_ON(channel != 0); - 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; + saved_mode = pit->pit_state.channels[0].mode; + pit->pit_state.channels[0].mode = 0xff; /* disable timer */ + pit_load_count(pit, channel, val); + pit->pit_state.channels[0].mode = saved_mode; } else { - pit_load_count(kvm, channel, val); + pit_load_count(pit, channel, val); } } @@ -429,7 +426,6 @@ static int pit_ioport_write(struct kvm_vcpu *vcpu, { 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; @@ -453,9 +449,9 @@ static int pit_ioport_write(struct kvm_vcpu *vcpu, s = &pit_state->channels[channel]; if (val & (2 << channel)) { if (!(val & 0x20)) - pit_latch_count(kvm, channel); + pit_latch_count(pit, channel); if (!(val & 0x10)) - pit_latch_status(kvm, channel); + pit_latch_status(pit, channel); } } } else { @@ -463,7 +459,7 @@ static int pit_ioport_write(struct kvm_vcpu *vcpu, s = &pit_state->channels[channel]; access = (val >> 4) & KVM_PIT_CHANNEL_MASK; if (access == 0) { - pit_latch_count(kvm, channel); + pit_latch_count(pit, channel); } else { s->rw_mode = access; s->read_state = access; @@ -480,17 +476,17 @@ static int pit_ioport_write(struct kvm_vcpu *vcpu, switch (s->write_state) { default: case RW_STATE_LSB: - pit_load_count(kvm, addr, val); + pit_load_count(pit, addr, val); break; case RW_STATE_MSB: - pit_load_count(kvm, addr, val << 8); + pit_load_count(pit, addr, val << 8); break; case RW_STATE_WORD0: s->write_latch = val; s->write_state = RW_STATE_WORD1; break; case RW_STATE_WORD1: - pit_load_count(kvm, addr, s->write_latch | (val << 8)); + pit_load_count(pit, addr, s->write_latch | (val << 8)); s->write_state = RW_STATE_WORD0; break; } @@ -506,7 +502,6 @@ static int pit_ioport_read(struct kvm_vcpu *vcpu, { 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)) @@ -543,20 +538,20 @@ static int pit_ioport_read(struct kvm_vcpu *vcpu, switch (s->read_state) { default: case RW_STATE_LSB: - count = pit_get_count(kvm, addr); + count = pit_get_count(pit, addr); ret = count & 0xff; break; case RW_STATE_MSB: - count = pit_get_count(kvm, addr); + count = pit_get_count(pit, addr); ret = (count >> 8) & 0xff; break; case RW_STATE_WORD0: - count = pit_get_count(kvm, addr); + count = pit_get_count(pit, addr); ret = count & 0xff; s->read_state = RW_STATE_WORD1; break; case RW_STATE_WORD1: - count = pit_get_count(kvm, addr); + count = pit_get_count(pit, addr); ret = (count >> 8) & 0xff; s->read_state = RW_STATE_WORD0; break; @@ -577,14 +572,13 @@ static int speaker_ioport_write(struct kvm_vcpu *vcpu, { 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); + pit_set_gate(pit, 2, val & 1); mutex_unlock(&pit_state->lock); return 0; } @@ -595,7 +589,6 @@ static int speaker_ioport_read(struct kvm_vcpu *vcpu, { 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) @@ -605,8 +598,8 @@ static int speaker_ioport_read(struct kvm_vcpu *vcpu, refresh_clock = ((unsigned int)ktime_to_ns(ktime_get()) >> 14) & 1; mutex_lock(&pit_state->lock); - ret = ((pit_state->speaker_data_on << 1) | pit_get_gate(kvm, 2) | - (pit_get_out(kvm, 2) << 5) | (refresh_clock << 4)); + ret = ((pit_state->speaker_data_on << 1) | pit_get_gate(pit, 2) | + (pit_get_out(pit, 2) << 5) | (refresh_clock << 4)); if (len > sizeof(ret)) len = sizeof(ret); memcpy(data, (char *)&ret, len); @@ -625,7 +618,7 @@ void kvm_pit_reset(struct kvm_pit *pit) c = &pit->pit_state.channels[i]; c->mode = 0xff; c->gate = (i != 2); - pit_load_count(pit->kvm, i, 0); + pit_load_count(pit, i, 0); } mutex_unlock(&pit->pit_state.lock); @@ -687,7 +680,6 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags) } init_kthread_work(&pit->expired, pit_do_work); - kvm->arch.vpit = pit; pit->kvm = kvm; pit_state = &pit->pit_state; diff --git a/arch/x86/kvm/i8254.h b/arch/x86/kvm/i8254.h index f8cf4b8..a6aceaf 100644 --- a/arch/x86/kvm/i8254.h +++ b/arch/x86/kvm/i8254.h @@ -56,9 +56,11 @@ struct kvm_pit { #define KVM_MAX_PIT_INTR_INTERVAL HZ / 100 #define KVM_PIT_CHANNEL_MASK 0x3 -void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start); struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags); void kvm_free_pit(struct kvm *kvm); + void kvm_pit_reset(struct kvm_pit *pit); +void kvm_pit_load_count(struct kvm_pit *pit, int channel, u32 val, + int hpet_legacy_start); #endif diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index f4654e4..a88e1a3 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3613,11 +3613,13 @@ static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps) static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps) { int i; - mutex_lock(&kvm->arch.vpit->pit_state.lock); - memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state)); + struct kvm_pit *pit = kvm->arch.vpit; + + mutex_lock(&pit->pit_state.lock); + memcpy(&pit->pit_state, ps, sizeof(struct kvm_pit_state)); for (i = 0; i < 3; i++) - kvm_pit_load_count(kvm, i, ps->channels[i].count, 0); - mutex_unlock(&kvm->arch.vpit->pit_state.lock); + kvm_pit_load_count(pit, i, ps->channels[i].count, 0); + mutex_unlock(&pit->pit_state.lock); return 0; } @@ -3637,18 +3639,20 @@ static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) int start = 0; int i; u32 prev_legacy, cur_legacy; - mutex_lock(&kvm->arch.vpit->pit_state.lock); - prev_legacy = kvm->arch.vpit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY; + struct kvm_pit *pit = kvm->arch.vpit; + + mutex_lock(&pit->pit_state.lock); + prev_legacy = pit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY; cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY; if (!prev_legacy && cur_legacy) start = 1; - memcpy(&kvm->arch.vpit->pit_state.channels, &ps->channels, - sizeof(kvm->arch.vpit->pit_state.channels)); - kvm->arch.vpit->pit_state.flags = ps->flags; + memcpy(&pit->pit_state.channels, &ps->channels, + sizeof(pit->pit_state.channels)); + pit->pit_state.flags = ps->flags; for (i = 0; i < 3; i++) - kvm_pit_load_count(kvm, i, kvm->arch.vpit->pit_state.channels[i].count, + kvm_pit_load_count(pit, i, pit->pit_state.channels[i].count, start && i == 0); - mutex_unlock(&kvm->arch.vpit->pit_state.lock); + mutex_unlock(&pit->pit_state.lock); return 0; }