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The [clang-analyzer-deadcode.DeadStores] helper reports that the value stored to 'irq' is never read. Signed-off-by: Like Xu <likexu@tencent.com> Message-Id: <20220301120217.38092-1-likexu@tencent.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
655 lines
14 KiB
C
655 lines
14 KiB
C
/*
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* 8259 interrupt controller emulation
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*
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* Copyright (c) 2003-2004 Fabrice Bellard
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* Copyright (c) 2007 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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* Authors:
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* Yaozu (Eddie) Dong <Eddie.dong@intel.com>
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* Port from Qemu.
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*/
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/bitops.h>
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#include "irq.h"
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#include <linux/kvm_host.h>
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#include "trace.h"
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#define pr_pic_unimpl(fmt, ...) \
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pr_err_ratelimited("kvm: pic: " fmt, ## __VA_ARGS__)
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static void pic_irq_request(struct kvm *kvm, int level);
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static void pic_lock(struct kvm_pic *s)
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__acquires(&s->lock)
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{
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spin_lock(&s->lock);
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}
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static void pic_unlock(struct kvm_pic *s)
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__releases(&s->lock)
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{
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bool wakeup = s->wakeup_needed;
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struct kvm_vcpu *vcpu;
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unsigned long i;
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s->wakeup_needed = false;
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spin_unlock(&s->lock);
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if (wakeup) {
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kvm_for_each_vcpu(i, vcpu, s->kvm) {
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if (kvm_apic_accept_pic_intr(vcpu)) {
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kvm_make_request(KVM_REQ_EVENT, vcpu);
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kvm_vcpu_kick(vcpu);
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return;
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}
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}
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}
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}
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static void pic_clear_isr(struct kvm_kpic_state *s, int irq)
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{
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s->isr &= ~(1 << irq);
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if (s != &s->pics_state->pics[0])
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irq += 8;
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/*
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* We are dropping lock while calling ack notifiers since ack
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* notifier callbacks for assigned devices call into PIC recursively.
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* Other interrupt may be delivered to PIC while lock is dropped but
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* it should be safe since PIC state is already updated at this stage.
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*/
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pic_unlock(s->pics_state);
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kvm_notify_acked_irq(s->pics_state->kvm, SELECT_PIC(irq), irq);
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pic_lock(s->pics_state);
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}
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/*
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* set irq level. If an edge is detected, then the IRR is set to 1
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*/
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static inline int pic_set_irq1(struct kvm_kpic_state *s, int irq, int level)
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{
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int mask, ret = 1;
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mask = 1 << irq;
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if (s->elcr & mask) /* level triggered */
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if (level) {
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ret = !(s->irr & mask);
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s->irr |= mask;
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s->last_irr |= mask;
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} else {
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s->irr &= ~mask;
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s->last_irr &= ~mask;
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}
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else /* edge triggered */
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if (level) {
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if ((s->last_irr & mask) == 0) {
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ret = !(s->irr & mask);
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s->irr |= mask;
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}
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s->last_irr |= mask;
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} else
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s->last_irr &= ~mask;
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return (s->imr & mask) ? -1 : ret;
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}
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/*
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* return the highest priority found in mask (highest = smallest
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* number). Return 8 if no irq
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*/
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static inline int get_priority(struct kvm_kpic_state *s, int mask)
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{
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int priority;
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if (mask == 0)
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return 8;
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priority = 0;
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while ((mask & (1 << ((priority + s->priority_add) & 7))) == 0)
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priority++;
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return priority;
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}
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/*
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* return the pic wanted interrupt. return -1 if none
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*/
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static int pic_get_irq(struct kvm_kpic_state *s)
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{
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int mask, cur_priority, priority;
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mask = s->irr & ~s->imr;
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priority = get_priority(s, mask);
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if (priority == 8)
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return -1;
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/*
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* compute current priority. If special fully nested mode on the
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* master, the IRQ coming from the slave is not taken into account
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* for the priority computation.
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*/
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mask = s->isr;
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if (s->special_fully_nested_mode && s == &s->pics_state->pics[0])
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mask &= ~(1 << 2);
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cur_priority = get_priority(s, mask);
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if (priority < cur_priority)
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/*
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* higher priority found: an irq should be generated
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*/
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return (priority + s->priority_add) & 7;
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else
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return -1;
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}
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/*
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* raise irq to CPU if necessary. must be called every time the active
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* irq may change
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*/
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static void pic_update_irq(struct kvm_pic *s)
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{
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int irq2, irq;
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irq2 = pic_get_irq(&s->pics[1]);
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if (irq2 >= 0) {
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/*
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* if irq request by slave pic, signal master PIC
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*/
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pic_set_irq1(&s->pics[0], 2, 1);
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pic_set_irq1(&s->pics[0], 2, 0);
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}
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irq = pic_get_irq(&s->pics[0]);
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pic_irq_request(s->kvm, irq >= 0);
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}
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void kvm_pic_update_irq(struct kvm_pic *s)
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{
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pic_lock(s);
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pic_update_irq(s);
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pic_unlock(s);
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}
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int kvm_pic_set_irq(struct kvm_pic *s, int irq, int irq_source_id, int level)
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{
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int ret, irq_level;
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BUG_ON(irq < 0 || irq >= PIC_NUM_PINS);
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pic_lock(s);
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irq_level = __kvm_irq_line_state(&s->irq_states[irq],
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irq_source_id, level);
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ret = pic_set_irq1(&s->pics[irq >> 3], irq & 7, irq_level);
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pic_update_irq(s);
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trace_kvm_pic_set_irq(irq >> 3, irq & 7, s->pics[irq >> 3].elcr,
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s->pics[irq >> 3].imr, ret == 0);
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pic_unlock(s);
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return ret;
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}
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void kvm_pic_clear_all(struct kvm_pic *s, int irq_source_id)
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{
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int i;
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pic_lock(s);
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for (i = 0; i < PIC_NUM_PINS; i++)
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__clear_bit(irq_source_id, &s->irq_states[i]);
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pic_unlock(s);
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}
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/*
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* acknowledge interrupt 'irq'
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*/
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static inline void pic_intack(struct kvm_kpic_state *s, int irq)
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{
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s->isr |= 1 << irq;
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/*
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* We don't clear a level sensitive interrupt here
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*/
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if (!(s->elcr & (1 << irq)))
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s->irr &= ~(1 << irq);
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if (s->auto_eoi) {
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if (s->rotate_on_auto_eoi)
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s->priority_add = (irq + 1) & 7;
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pic_clear_isr(s, irq);
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}
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}
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int kvm_pic_read_irq(struct kvm *kvm)
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{
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int irq, irq2, intno;
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struct kvm_pic *s = kvm->arch.vpic;
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s->output = 0;
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pic_lock(s);
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irq = pic_get_irq(&s->pics[0]);
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if (irq >= 0) {
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pic_intack(&s->pics[0], irq);
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if (irq == 2) {
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irq2 = pic_get_irq(&s->pics[1]);
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if (irq2 >= 0)
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pic_intack(&s->pics[1], irq2);
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else
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/*
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* spurious IRQ on slave controller
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*/
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irq2 = 7;
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intno = s->pics[1].irq_base + irq2;
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} else
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intno = s->pics[0].irq_base + irq;
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} else {
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/*
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* spurious IRQ on host controller
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*/
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irq = 7;
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intno = s->pics[0].irq_base + irq;
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}
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pic_update_irq(s);
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pic_unlock(s);
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return intno;
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}
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static void kvm_pic_reset(struct kvm_kpic_state *s)
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{
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int irq;
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unsigned long i;
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struct kvm_vcpu *vcpu;
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u8 edge_irr = s->irr & ~s->elcr;
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bool found = false;
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s->last_irr = 0;
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s->irr &= s->elcr;
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s->imr = 0;
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s->priority_add = 0;
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s->special_mask = 0;
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s->read_reg_select = 0;
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if (!s->init4) {
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s->special_fully_nested_mode = 0;
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s->auto_eoi = 0;
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}
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s->init_state = 1;
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kvm_for_each_vcpu(i, vcpu, s->pics_state->kvm)
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if (kvm_apic_accept_pic_intr(vcpu)) {
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found = true;
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break;
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}
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if (!found)
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return;
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for (irq = 0; irq < PIC_NUM_PINS/2; irq++)
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if (edge_irr & (1 << irq))
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pic_clear_isr(s, irq);
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}
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static void pic_ioport_write(void *opaque, u32 addr, u32 val)
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{
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struct kvm_kpic_state *s = opaque;
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int priority, cmd, irq;
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addr &= 1;
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if (addr == 0) {
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if (val & 0x10) {
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s->init4 = val & 1;
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if (val & 0x02)
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pr_pic_unimpl("single mode not supported");
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if (val & 0x08)
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pr_pic_unimpl(
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"level sensitive irq not supported");
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kvm_pic_reset(s);
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} else if (val & 0x08) {
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if (val & 0x04)
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s->poll = 1;
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if (val & 0x02)
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s->read_reg_select = val & 1;
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if (val & 0x40)
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s->special_mask = (val >> 5) & 1;
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} else {
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cmd = val >> 5;
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switch (cmd) {
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case 0:
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case 4:
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s->rotate_on_auto_eoi = cmd >> 2;
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break;
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case 1: /* end of interrupt */
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case 5:
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priority = get_priority(s, s->isr);
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if (priority != 8) {
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irq = (priority + s->priority_add) & 7;
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if (cmd == 5)
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s->priority_add = (irq + 1) & 7;
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pic_clear_isr(s, irq);
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pic_update_irq(s->pics_state);
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}
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break;
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case 3:
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irq = val & 7;
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pic_clear_isr(s, irq);
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pic_update_irq(s->pics_state);
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break;
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case 6:
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s->priority_add = (val + 1) & 7;
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pic_update_irq(s->pics_state);
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break;
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case 7:
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irq = val & 7;
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s->priority_add = (irq + 1) & 7;
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pic_clear_isr(s, irq);
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pic_update_irq(s->pics_state);
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break;
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default:
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break; /* no operation */
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}
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}
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} else
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switch (s->init_state) {
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case 0: { /* normal mode */
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u8 imr_diff = s->imr ^ val,
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off = (s == &s->pics_state->pics[0]) ? 0 : 8;
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s->imr = val;
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for (irq = 0; irq < PIC_NUM_PINS/2; irq++)
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if (imr_diff & (1 << irq))
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kvm_fire_mask_notifiers(
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s->pics_state->kvm,
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SELECT_PIC(irq + off),
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irq + off,
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!!(s->imr & (1 << irq)));
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pic_update_irq(s->pics_state);
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break;
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}
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case 1:
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s->irq_base = val & 0xf8;
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s->init_state = 2;
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break;
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case 2:
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if (s->init4)
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s->init_state = 3;
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else
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s->init_state = 0;
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break;
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case 3:
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s->special_fully_nested_mode = (val >> 4) & 1;
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s->auto_eoi = (val >> 1) & 1;
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s->init_state = 0;
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break;
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}
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}
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static u32 pic_poll_read(struct kvm_kpic_state *s, u32 addr1)
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{
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int ret;
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ret = pic_get_irq(s);
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if (ret >= 0) {
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if (addr1 >> 7) {
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s->pics_state->pics[0].isr &= ~(1 << 2);
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s->pics_state->pics[0].irr &= ~(1 << 2);
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}
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s->irr &= ~(1 << ret);
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pic_clear_isr(s, ret);
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if (addr1 >> 7 || ret != 2)
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pic_update_irq(s->pics_state);
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} else {
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ret = 0x07;
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pic_update_irq(s->pics_state);
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}
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return ret;
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}
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static u32 pic_ioport_read(void *opaque, u32 addr)
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{
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struct kvm_kpic_state *s = opaque;
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int ret;
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if (s->poll) {
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ret = pic_poll_read(s, addr);
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s->poll = 0;
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} else
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if ((addr & 1) == 0)
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if (s->read_reg_select)
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ret = s->isr;
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else
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ret = s->irr;
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else
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ret = s->imr;
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return ret;
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}
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static void elcr_ioport_write(void *opaque, u32 val)
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{
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struct kvm_kpic_state *s = opaque;
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s->elcr = val & s->elcr_mask;
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}
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static u32 elcr_ioport_read(void *opaque)
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{
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struct kvm_kpic_state *s = opaque;
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return s->elcr;
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}
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static int picdev_write(struct kvm_pic *s,
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gpa_t addr, int len, const void *val)
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{
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unsigned char data = *(unsigned char *)val;
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if (len != 1) {
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pr_pic_unimpl("non byte write\n");
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return 0;
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}
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switch (addr) {
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case 0x20:
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case 0x21:
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pic_lock(s);
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pic_ioport_write(&s->pics[0], addr, data);
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pic_unlock(s);
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break;
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case 0xa0:
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case 0xa1:
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pic_lock(s);
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pic_ioport_write(&s->pics[1], addr, data);
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pic_unlock(s);
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break;
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case 0x4d0:
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case 0x4d1:
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pic_lock(s);
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elcr_ioport_write(&s->pics[addr & 1], data);
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pic_unlock(s);
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break;
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default:
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static int picdev_read(struct kvm_pic *s,
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gpa_t addr, int len, void *val)
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{
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unsigned char *data = (unsigned char *)val;
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if (len != 1) {
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memset(val, 0, len);
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pr_pic_unimpl("non byte read\n");
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return 0;
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}
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switch (addr) {
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case 0x20:
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case 0x21:
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case 0xa0:
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case 0xa1:
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pic_lock(s);
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*data = pic_ioport_read(&s->pics[addr >> 7], addr);
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pic_unlock(s);
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break;
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case 0x4d0:
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case 0x4d1:
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pic_lock(s);
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*data = elcr_ioport_read(&s->pics[addr & 1]);
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pic_unlock(s);
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break;
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default:
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static int picdev_master_write(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
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gpa_t addr, int len, const void *val)
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{
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return picdev_write(container_of(dev, struct kvm_pic, dev_master),
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addr, len, val);
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}
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static int picdev_master_read(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
|
|
gpa_t addr, int len, void *val)
|
|
{
|
|
return picdev_read(container_of(dev, struct kvm_pic, dev_master),
|
|
addr, len, val);
|
|
}
|
|
|
|
static int picdev_slave_write(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
|
|
gpa_t addr, int len, const void *val)
|
|
{
|
|
return picdev_write(container_of(dev, struct kvm_pic, dev_slave),
|
|
addr, len, val);
|
|
}
|
|
|
|
static int picdev_slave_read(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
|
|
gpa_t addr, int len, void *val)
|
|
{
|
|
return picdev_read(container_of(dev, struct kvm_pic, dev_slave),
|
|
addr, len, val);
|
|
}
|
|
|
|
static int picdev_elcr_write(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
|
|
gpa_t addr, int len, const void *val)
|
|
{
|
|
return picdev_write(container_of(dev, struct kvm_pic, dev_elcr),
|
|
addr, len, val);
|
|
}
|
|
|
|
static int picdev_elcr_read(struct kvm_vcpu *vcpu, struct kvm_io_device *dev,
|
|
gpa_t addr, int len, void *val)
|
|
{
|
|
return picdev_read(container_of(dev, struct kvm_pic, dev_elcr),
|
|
addr, len, val);
|
|
}
|
|
|
|
/*
|
|
* callback when PIC0 irq status changed
|
|
*/
|
|
static void pic_irq_request(struct kvm *kvm, int level)
|
|
{
|
|
struct kvm_pic *s = kvm->arch.vpic;
|
|
|
|
if (!s->output)
|
|
s->wakeup_needed = true;
|
|
s->output = level;
|
|
}
|
|
|
|
static const struct kvm_io_device_ops picdev_master_ops = {
|
|
.read = picdev_master_read,
|
|
.write = picdev_master_write,
|
|
};
|
|
|
|
static const struct kvm_io_device_ops picdev_slave_ops = {
|
|
.read = picdev_slave_read,
|
|
.write = picdev_slave_write,
|
|
};
|
|
|
|
static const struct kvm_io_device_ops picdev_elcr_ops = {
|
|
.read = picdev_elcr_read,
|
|
.write = picdev_elcr_write,
|
|
};
|
|
|
|
int kvm_pic_init(struct kvm *kvm)
|
|
{
|
|
struct kvm_pic *s;
|
|
int ret;
|
|
|
|
s = kzalloc(sizeof(struct kvm_pic), GFP_KERNEL_ACCOUNT);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
spin_lock_init(&s->lock);
|
|
s->kvm = kvm;
|
|
s->pics[0].elcr_mask = 0xf8;
|
|
s->pics[1].elcr_mask = 0xde;
|
|
s->pics[0].pics_state = s;
|
|
s->pics[1].pics_state = s;
|
|
|
|
/*
|
|
* Initialize PIO device
|
|
*/
|
|
kvm_iodevice_init(&s->dev_master, &picdev_master_ops);
|
|
kvm_iodevice_init(&s->dev_slave, &picdev_slave_ops);
|
|
kvm_iodevice_init(&s->dev_elcr, &picdev_elcr_ops);
|
|
mutex_lock(&kvm->slots_lock);
|
|
ret = kvm_io_bus_register_dev(kvm, KVM_PIO_BUS, 0x20, 2,
|
|
&s->dev_master);
|
|
if (ret < 0)
|
|
goto fail_unlock;
|
|
|
|
ret = kvm_io_bus_register_dev(kvm, KVM_PIO_BUS, 0xa0, 2, &s->dev_slave);
|
|
if (ret < 0)
|
|
goto fail_unreg_2;
|
|
|
|
ret = kvm_io_bus_register_dev(kvm, KVM_PIO_BUS, 0x4d0, 2, &s->dev_elcr);
|
|
if (ret < 0)
|
|
goto fail_unreg_1;
|
|
|
|
mutex_unlock(&kvm->slots_lock);
|
|
|
|
kvm->arch.vpic = s;
|
|
|
|
return 0;
|
|
|
|
fail_unreg_1:
|
|
kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &s->dev_slave);
|
|
|
|
fail_unreg_2:
|
|
kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS, &s->dev_master);
|
|
|
|
fail_unlock:
|
|
mutex_unlock(&kvm->slots_lock);
|
|
|
|
kfree(s);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void kvm_pic_destroy(struct kvm *kvm)
|
|
{
|
|
struct kvm_pic *vpic = kvm->arch.vpic;
|
|
|
|
if (!vpic)
|
|
return;
|
|
|
|
mutex_lock(&kvm->slots_lock);
|
|
kvm_io_bus_unregister_dev(vpic->kvm, KVM_PIO_BUS, &vpic->dev_master);
|
|
kvm_io_bus_unregister_dev(vpic->kvm, KVM_PIO_BUS, &vpic->dev_slave);
|
|
kvm_io_bus_unregister_dev(vpic->kvm, KVM_PIO_BUS, &vpic->dev_elcr);
|
|
mutex_unlock(&kvm->slots_lock);
|
|
|
|
kvm->arch.vpic = NULL;
|
|
kfree(vpic);
|
|
}
|