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748 lines
18 KiB
748 lines
18 KiB
/* |
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* 8253/8254 interval timer emulation |
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* |
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* Copyright (c) 2003-2004 Fabrice Bellard |
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* Copyright (c) 2006 Intel Corporation |
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* Copyright (c) 2007 Keir Fraser, XenSource Inc |
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* Copyright (c) 2008 Intel Corporation |
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* Copyright 2009 Red Hat, Inc. and/or its affiliates. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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* |
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* Authors: |
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* Sheng Yang <[email protected]> |
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* Based on QEMU and Xen. |
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*/ |
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|
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#define pr_fmt(fmt) "pit: " fmt |
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|
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#include <linux/kvm_host.h> |
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#include <linux/slab.h> |
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|
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#include "ioapic.h" |
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#include "irq.h" |
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#include "i8254.h" |
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#include "x86.h" |
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|
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#ifndef CONFIG_X86_64 |
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#define mod_64(x, y) ((x) - (y) * div64_u64(x, y)) |
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#else |
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#define mod_64(x, y) ((x) % (y)) |
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#endif |
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|
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#define RW_STATE_LSB 1 |
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#define RW_STATE_MSB 2 |
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#define RW_STATE_WORD0 3 |
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#define RW_STATE_WORD1 4 |
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|
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static void pit_set_gate(struct kvm_pit *pit, int channel, u32 val) |
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{ |
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struct kvm_kpit_channel_state *c = &pit->pit_state.channels[channel]; |
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|
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switch (c->mode) { |
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default: |
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case 0: |
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case 4: |
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/* XXX: just disable/enable counting */ |
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break; |
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case 1: |
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case 2: |
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case 3: |
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case 5: |
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/* Restart counting on rising edge. */ |
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if (c->gate < val) |
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c->count_load_time = ktime_get(); |
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break; |
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} |
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|
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c->gate = val; |
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} |
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|
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static int pit_get_gate(struct kvm_pit *pit, int channel) |
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{ |
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return pit->pit_state.channels[channel].gate; |
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} |
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|
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static s64 __kpit_elapsed(struct kvm_pit *pit) |
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{ |
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s64 elapsed; |
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ktime_t remaining; |
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struct kvm_kpit_state *ps = &pit->pit_state; |
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|
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if (!ps->period) |
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return 0; |
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|
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/* |
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* The Counter does not stop when it reaches zero. In |
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* Modes 0, 1, 4, and 5 the Counter ``wraps around'' to |
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* the highest count, either FFFF hex for binary counting |
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* or 9999 for BCD counting, and continues counting. |
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* Modes 2 and 3 are periodic; the Counter reloads |
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* itself with the initial count and continues counting |
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* from there. |
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*/ |
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remaining = hrtimer_get_remaining(&ps->timer); |
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elapsed = ps->period - ktime_to_ns(remaining); |
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|
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return elapsed; |
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} |
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|
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static s64 kpit_elapsed(struct kvm_pit *pit, struct kvm_kpit_channel_state *c, |
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int channel) |
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{ |
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if (channel == 0) |
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return __kpit_elapsed(pit); |
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|
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return ktime_to_ns(ktime_sub(ktime_get(), c->count_load_time)); |
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} |
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|
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static int pit_get_count(struct kvm_pit *pit, int channel) |
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{ |
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struct kvm_kpit_channel_state *c = &pit->pit_state.channels[channel]; |
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s64 d, t; |
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int counter; |
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|
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t = kpit_elapsed(pit, c, channel); |
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d = mul_u64_u32_div(t, KVM_PIT_FREQ, NSEC_PER_SEC); |
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|
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switch (c->mode) { |
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case 0: |
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case 1: |
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case 4: |
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case 5: |
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counter = (c->count - d) & 0xffff; |
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break; |
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case 3: |
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/* XXX: may be incorrect for odd counts */ |
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counter = c->count - (mod_64((2 * d), c->count)); |
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break; |
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default: |
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counter = c->count - mod_64(d, c->count); |
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break; |
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} |
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return counter; |
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} |
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|
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static int pit_get_out(struct kvm_pit *pit, int channel) |
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{ |
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struct kvm_kpit_channel_state *c = &pit->pit_state.channels[channel]; |
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s64 d, t; |
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int out; |
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|
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t = kpit_elapsed(pit, c, channel); |
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d = mul_u64_u32_div(t, KVM_PIT_FREQ, NSEC_PER_SEC); |
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|
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switch (c->mode) { |
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default: |
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case 0: |
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out = (d >= c->count); |
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break; |
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case 1: |
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out = (d < c->count); |
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break; |
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case 2: |
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out = ((mod_64(d, c->count) == 0) && (d != 0)); |
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break; |
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case 3: |
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out = (mod_64(d, c->count) < ((c->count + 1) >> 1)); |
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break; |
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case 4: |
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case 5: |
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out = (d == c->count); |
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break; |
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} |
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|
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return out; |
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} |
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|
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static void pit_latch_count(struct kvm_pit *pit, int channel) |
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{ |
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struct kvm_kpit_channel_state *c = &pit->pit_state.channels[channel]; |
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|
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if (!c->count_latched) { |
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c->latched_count = pit_get_count(pit, channel); |
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c->count_latched = c->rw_mode; |
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} |
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} |
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|
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static void pit_latch_status(struct kvm_pit *pit, int channel) |
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{ |
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struct kvm_kpit_channel_state *c = &pit->pit_state.channels[channel]; |
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|
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if (!c->status_latched) { |
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/* TODO: Return NULL COUNT (bit 6). */ |
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c->status = ((pit_get_out(pit, channel) << 7) | |
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(c->rw_mode << 4) | |
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(c->mode << 1) | |
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c->bcd); |
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c->status_latched = 1; |
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} |
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} |
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|
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static inline struct kvm_pit *pit_state_to_pit(struct kvm_kpit_state *ps) |
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{ |
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return container_of(ps, struct kvm_pit, pit_state); |
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} |
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|
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static void kvm_pit_ack_irq(struct kvm_irq_ack_notifier *kian) |
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{ |
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struct kvm_kpit_state *ps = container_of(kian, struct kvm_kpit_state, |
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irq_ack_notifier); |
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struct kvm_pit *pit = pit_state_to_pit(ps); |
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|
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atomic_set(&ps->irq_ack, 1); |
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/* irq_ack should be set before pending is read. Order accesses with |
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* inc(pending) in pit_timer_fn and xchg(irq_ack, 0) in pit_do_work. |
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*/ |
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smp_mb(); |
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if (atomic_dec_if_positive(&ps->pending) > 0) |
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kthread_queue_work(pit->worker, &pit->expired); |
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} |
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|
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void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu) |
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{ |
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struct kvm_pit *pit = vcpu->kvm->arch.vpit; |
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struct hrtimer *timer; |
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|
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if (!kvm_vcpu_is_bsp(vcpu) || !pit) |
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return; |
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|
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timer = &pit->pit_state.timer; |
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mutex_lock(&pit->pit_state.lock); |
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if (hrtimer_cancel(timer)) |
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hrtimer_start_expires(timer, HRTIMER_MODE_ABS); |
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mutex_unlock(&pit->pit_state.lock); |
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} |
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|
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static void destroy_pit_timer(struct kvm_pit *pit) |
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{ |
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hrtimer_cancel(&pit->pit_state.timer); |
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kthread_flush_work(&pit->expired); |
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} |
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|
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static void pit_do_work(struct kthread_work *work) |
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{ |
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struct kvm_pit *pit = container_of(work, struct kvm_pit, expired); |
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struct kvm *kvm = pit->kvm; |
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struct kvm_vcpu *vcpu; |
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int i; |
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struct kvm_kpit_state *ps = &pit->pit_state; |
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|
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if (atomic_read(&ps->reinject) && !atomic_xchg(&ps->irq_ack, 0)) |
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return; |
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|
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kvm_set_irq(kvm, pit->irq_source_id, 0, 1, false); |
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kvm_set_irq(kvm, pit->irq_source_id, 0, 0, false); |
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|
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/* |
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* Provides NMI watchdog support via Virtual Wire mode. |
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* The route is: PIT -> LVT0 in NMI mode. |
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* |
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* Note: Our Virtual Wire implementation does not follow |
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* the MP specification. We propagate a PIT interrupt to all |
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* VCPUs and only when LVT0 is in NMI mode. The interrupt can |
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* also be simultaneously delivered through PIC and IOAPIC. |
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*/ |
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if (atomic_read(&kvm->arch.vapics_in_nmi_mode) > 0) |
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kvm_for_each_vcpu(i, vcpu, kvm) |
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kvm_apic_nmi_wd_deliver(vcpu); |
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} |
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|
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static enum hrtimer_restart pit_timer_fn(struct hrtimer *data) |
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{ |
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struct kvm_kpit_state *ps = container_of(data, struct kvm_kpit_state, timer); |
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struct kvm_pit *pt = pit_state_to_pit(ps); |
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|
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if (atomic_read(&ps->reinject)) |
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atomic_inc(&ps->pending); |
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kthread_queue_work(pt->worker, &pt->expired); |
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|
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if (ps->is_periodic) { |
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hrtimer_add_expires_ns(&ps->timer, ps->period); |
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return HRTIMER_RESTART; |
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} else |
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return HRTIMER_NORESTART; |
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} |
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|
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static inline void kvm_pit_reset_reinject(struct kvm_pit *pit) |
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{ |
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atomic_set(&pit->pit_state.pending, 0); |
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atomic_set(&pit->pit_state.irq_ack, 1); |
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} |
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|
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void kvm_pit_set_reinject(struct kvm_pit *pit, bool reinject) |
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{ |
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struct kvm_kpit_state *ps = &pit->pit_state; |
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struct kvm *kvm = pit->kvm; |
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|
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if (atomic_read(&ps->reinject) == reinject) |
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return; |
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|
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/* |
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* AMD SVM AVIC accelerates EOI write and does not trap. |
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* This cause in-kernel PIT re-inject mode to fail |
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* since it checks ps->irq_ack before kvm_set_irq() |
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* and relies on the ack notifier to timely queue |
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* the pt->worker work iterm and reinject the missed tick. |
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* So, deactivate APICv when PIT is in reinject mode. |
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*/ |
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if (reinject) { |
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kvm_request_apicv_update(kvm, false, |
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APICV_INHIBIT_REASON_PIT_REINJ); |
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/* The initial state is preserved while ps->reinject == 0. */ |
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kvm_pit_reset_reinject(pit); |
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kvm_register_irq_ack_notifier(kvm, &ps->irq_ack_notifier); |
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kvm_register_irq_mask_notifier(kvm, 0, &pit->mask_notifier); |
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} else { |
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kvm_request_apicv_update(kvm, true, |
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APICV_INHIBIT_REASON_PIT_REINJ); |
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kvm_unregister_irq_ack_notifier(kvm, &ps->irq_ack_notifier); |
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kvm_unregister_irq_mask_notifier(kvm, 0, &pit->mask_notifier); |
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} |
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|
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atomic_set(&ps->reinject, reinject); |
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} |
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|
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static void create_pit_timer(struct kvm_pit *pit, u32 val, int is_period) |
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{ |
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struct kvm_kpit_state *ps = &pit->pit_state; |
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struct kvm *kvm = pit->kvm; |
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s64 interval; |
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|
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if (!ioapic_in_kernel(kvm) || |
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ps->flags & KVM_PIT_FLAGS_HPET_LEGACY) |
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return; |
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|
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interval = mul_u64_u32_div(val, NSEC_PER_SEC, KVM_PIT_FREQ); |
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|
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pr_debug("create pit timer, interval is %llu nsec\n", interval); |
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|
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/* TODO The new value only affected after the retriggered */ |
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hrtimer_cancel(&ps->timer); |
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kthread_flush_work(&pit->expired); |
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ps->period = interval; |
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ps->is_periodic = is_period; |
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|
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kvm_pit_reset_reinject(pit); |
|
|
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/* |
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* Do not allow the guest to program periodic timers with small |
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* interval, since the hrtimers are not throttled by the host |
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* scheduler. |
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*/ |
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if (ps->is_periodic) { |
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s64 min_period = min_timer_period_us * 1000LL; |
|
|
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if (ps->period < min_period) { |
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pr_info_ratelimited( |
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"kvm: requested %lld ns " |
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"i8254 timer period limited to %lld ns\n", |
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ps->period, min_period); |
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ps->period = min_period; |
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} |
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} |
|
|
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hrtimer_start(&ps->timer, ktime_add_ns(ktime_get(), interval), |
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HRTIMER_MODE_ABS); |
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} |
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|
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static void pit_load_count(struct kvm_pit *pit, int channel, u32 val) |
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{ |
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struct kvm_kpit_state *ps = &pit->pit_state; |
|
|
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pr_debug("load_count val is %u, channel is %d\n", val, channel); |
|
|
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/* |
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* The largest possible initial count is 0; this is equivalent |
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* to 216 for binary counting and 104 for BCD counting. |
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*/ |
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if (val == 0) |
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val = 0x10000; |
|
|
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ps->channels[channel].count = val; |
|
|
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if (channel != 0) { |
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ps->channels[channel].count_load_time = ktime_get(); |
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return; |
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} |
|
|
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/* Two types of timer |
|
* mode 1 is one shot, mode 2 is period, otherwise del timer */ |
|
switch (ps->channels[0].mode) { |
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case 0: |
|
case 1: |
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/* FIXME: enhance mode 4 precision */ |
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case 4: |
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create_pit_timer(pit, val, 0); |
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break; |
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case 2: |
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case 3: |
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create_pit_timer(pit, val, 1); |
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break; |
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default: |
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destroy_pit_timer(pit); |
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} |
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} |
|
|
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void kvm_pit_load_count(struct kvm_pit *pit, int channel, u32 val, |
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int hpet_legacy_start) |
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{ |
|
u8 saved_mode; |
|
|
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WARN_ON_ONCE(!mutex_is_locked(&pit->pit_state.lock)); |
|
|
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if (hpet_legacy_start) { |
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/* save existing mode for later reenablement */ |
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WARN_ON(channel != 0); |
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saved_mode = pit->pit_state.channels[0].mode; |
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pit->pit_state.channels[0].mode = 0xff; /* disable timer */ |
|
pit_load_count(pit, channel, val); |
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pit->pit_state.channels[0].mode = saved_mode; |
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} else { |
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pit_load_count(pit, channel, val); |
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} |
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} |
|
|
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static inline struct kvm_pit *dev_to_pit(struct kvm_io_device *dev) |
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{ |
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return container_of(dev, struct kvm_pit, dev); |
|
} |
|
|
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static inline struct kvm_pit *speaker_to_pit(struct kvm_io_device *dev) |
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{ |
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return container_of(dev, struct kvm_pit, speaker_dev); |
|
} |
|
|
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static inline int pit_in_range(gpa_t addr) |
|
{ |
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return ((addr >= KVM_PIT_BASE_ADDRESS) && |
|
(addr < KVM_PIT_BASE_ADDRESS + KVM_PIT_MEM_LENGTH)); |
|
} |
|
|
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static int pit_ioport_write(struct kvm_vcpu *vcpu, |
|
struct kvm_io_device *this, |
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gpa_t addr, int len, const void *data) |
|
{ |
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struct kvm_pit *pit = dev_to_pit(this); |
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struct kvm_kpit_state *pit_state = &pit->pit_state; |
|
int channel, access; |
|
struct kvm_kpit_channel_state *s; |
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u32 val = *(u32 *) data; |
|
if (!pit_in_range(addr)) |
|
return -EOPNOTSUPP; |
|
|
|
val &= 0xff; |
|
addr &= KVM_PIT_CHANNEL_MASK; |
|
|
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mutex_lock(&pit_state->lock); |
|
|
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if (val != 0) |
|
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; |
|
if (channel == 3) { |
|
/* Read-Back Command. */ |
|
for (channel = 0; channel < 3; channel++) { |
|
if (val & (2 << channel)) { |
|
if (!(val & 0x20)) |
|
pit_latch_count(pit, channel); |
|
if (!(val & 0x10)) |
|
pit_latch_status(pit, channel); |
|
} |
|
} |
|
} else { |
|
/* Select Counter <channel>. */ |
|
s = &pit_state->channels[channel]; |
|
access = (val >> 4) & KVM_PIT_CHANNEL_MASK; |
|
if (access == 0) { |
|
pit_latch_count(pit, channel); |
|
} else { |
|
s->rw_mode = access; |
|
s->read_state = access; |
|
s->write_state = access; |
|
s->mode = (val >> 1) & 7; |
|
if (s->mode > 5) |
|
s->mode -= 4; |
|
s->bcd = val & 1; |
|
} |
|
} |
|
} else { |
|
/* Write Count. */ |
|
s = &pit_state->channels[addr]; |
|
switch (s->write_state) { |
|
default: |
|
case RW_STATE_LSB: |
|
pit_load_count(pit, addr, val); |
|
break; |
|
case RW_STATE_MSB: |
|
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(pit, addr, s->write_latch | (val << 8)); |
|
s->write_state = RW_STATE_WORD0; |
|
break; |
|
} |
|
} |
|
|
|
mutex_unlock(&pit_state->lock); |
|
return 0; |
|
} |
|
|
|
static int pit_ioport_read(struct kvm_vcpu *vcpu, |
|
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; |
|
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); |
|
|
|
if (s->status_latched) { |
|
s->status_latched = 0; |
|
ret = s->status; |
|
} else if (s->count_latched) { |
|
switch (s->count_latched) { |
|
default: |
|
case RW_STATE_LSB: |
|
ret = s->latched_count & 0xff; |
|
s->count_latched = 0; |
|
break; |
|
case RW_STATE_MSB: |
|
ret = s->latched_count >> 8; |
|
s->count_latched = 0; |
|
break; |
|
case RW_STATE_WORD0: |
|
ret = s->latched_count & 0xff; |
|
s->count_latched = RW_STATE_MSB; |
|
break; |
|
} |
|
} else { |
|
switch (s->read_state) { |
|
default: |
|
case RW_STATE_LSB: |
|
count = pit_get_count(pit, addr); |
|
ret = count & 0xff; |
|
break; |
|
case RW_STATE_MSB: |
|
count = pit_get_count(pit, addr); |
|
ret = (count >> 8) & 0xff; |
|
break; |
|
case RW_STATE_WORD0: |
|
count = pit_get_count(pit, addr); |
|
ret = count & 0xff; |
|
s->read_state = RW_STATE_WORD1; |
|
break; |
|
case RW_STATE_WORD1: |
|
count = pit_get_count(pit, addr); |
|
ret = (count >> 8) & 0xff; |
|
s->read_state = RW_STATE_WORD0; |
|
break; |
|
} |
|
} |
|
|
|
if (len > sizeof(ret)) |
|
len = sizeof(ret); |
|
memcpy(data, (char *)&ret, len); |
|
|
|
mutex_unlock(&pit_state->lock); |
|
return 0; |
|
} |
|
|
|
static int speaker_ioport_write(struct kvm_vcpu *vcpu, |
|
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; |
|
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(pit, 2, val & 1); |
|
mutex_unlock(&pit_state->lock); |
|
return 0; |
|
} |
|
|
|
static int speaker_ioport_read(struct kvm_vcpu *vcpu, |
|
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; |
|
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; |
|
|
|
mutex_lock(&pit_state->lock); |
|
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); |
|
mutex_unlock(&pit_state->lock); |
|
return 0; |
|
} |
|
|
|
static void kvm_pit_reset(struct kvm_pit *pit) |
|
{ |
|
int i; |
|
struct kvm_kpit_channel_state *c; |
|
|
|
pit->pit_state.flags = 0; |
|
for (i = 0; i < 3; i++) { |
|
c = &pit->pit_state.channels[i]; |
|
c->mode = 0xff; |
|
c->gate = (i != 2); |
|
pit_load_count(pit, i, 0); |
|
} |
|
|
|
kvm_pit_reset_reinject(pit); |
|
} |
|
|
|
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) |
|
kvm_pit_reset_reinject(pit); |
|
} |
|
|
|
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, |
|
}; |
|
|
|
struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags) |
|
{ |
|
struct kvm_pit *pit; |
|
struct kvm_kpit_state *pit_state; |
|
struct pid *pid; |
|
pid_t pid_nr; |
|
int ret; |
|
|
|
pit = kzalloc(sizeof(struct kvm_pit), GFP_KERNEL_ACCOUNT); |
|
if (!pit) |
|
return NULL; |
|
|
|
pit->irq_source_id = kvm_request_irq_source_id(kvm); |
|
if (pit->irq_source_id < 0) |
|
goto fail_request; |
|
|
|
mutex_init(&pit->pit_state.lock); |
|
|
|
pid = get_pid(task_tgid(current)); |
|
pid_nr = pid_vnr(pid); |
|
put_pid(pid); |
|
|
|
pit->worker = kthread_create_worker(0, "kvm-pit/%d", pid_nr); |
|
if (IS_ERR(pit->worker)) |
|
goto fail_kthread; |
|
|
|
kthread_init_work(&pit->expired, pit_do_work); |
|
|
|
pit->kvm = kvm; |
|
|
|
pit_state = &pit->pit_state; |
|
hrtimer_init(&pit_state->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
|
pit_state->timer.function = pit_timer_fn; |
|
|
|
pit_state->irq_ack_notifier.gsi = 0; |
|
pit_state->irq_ack_notifier.irq_acked = kvm_pit_ack_irq; |
|
pit->mask_notifier.func = pit_mask_notifer; |
|
|
|
kvm_pit_reset(pit); |
|
|
|
kvm_pit_set_reinject(pit, true); |
|
|
|
mutex_lock(&kvm->slots_lock); |
|
kvm_iodevice_init(&pit->dev, &pit_dev_ops); |
|
ret = kvm_io_bus_register_dev(kvm, KVM_PIO_BUS, KVM_PIT_BASE_ADDRESS, |
|
KVM_PIT_MEM_LENGTH, &pit->dev); |
|
if (ret < 0) |
|
goto fail_register_pit; |
|
|
|
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, |
|
KVM_SPEAKER_BASE_ADDRESS, 4, |
|
&pit->speaker_dev); |
|
if (ret < 0) |
|
goto fail_register_speaker; |
|
} |
|
mutex_unlock(&kvm->slots_lock); |
|
|
|
return pit; |
|
|
|
fail_register_speaker: |
|
kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &pit->dev); |
|
fail_register_pit: |
|
mutex_unlock(&kvm->slots_lock); |
|
kvm_pit_set_reinject(pit, false); |
|
kthread_destroy_worker(pit->worker); |
|
fail_kthread: |
|
kvm_free_irq_source_id(kvm, pit->irq_source_id); |
|
fail_request: |
|
kfree(pit); |
|
return NULL; |
|
} |
|
|
|
void kvm_free_pit(struct kvm *kvm) |
|
{ |
|
struct kvm_pit *pit = kvm->arch.vpit; |
|
|
|
if (pit) { |
|
mutex_lock(&kvm->slots_lock); |
|
kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &pit->dev); |
|
kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &pit->speaker_dev); |
|
mutex_unlock(&kvm->slots_lock); |
|
kvm_pit_set_reinject(pit, false); |
|
hrtimer_cancel(&pit->pit_state.timer); |
|
kthread_destroy_worker(pit->worker); |
|
kvm_free_irq_source_id(kvm, pit->irq_source_id); |
|
kfree(pit); |
|
} |
|
}
|
|
|