gic.cc revision 11462 
1/*
2 * Copyright (c) 2015-2016 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Andreas Sandberg
38 */
39
40#include "arch/arm/kvm/gic.hh"
41
42#include <linux/kvm.h>
43
44#include "debug/Interrupt.hh"
45#include "params/KvmGic.hh"
46
47KvmKernelGicV2::KvmKernelGicV2(KvmVM &_vm, Addr cpu_addr, Addr dist_addr,
48                               unsigned it_lines)
49    : cpuRange(RangeSize(cpu_addr, KVM_VGIC_V2_CPU_SIZE)),
50      distRange(RangeSize(dist_addr, KVM_VGIC_V2_DIST_SIZE)),
51      vm(_vm),
52      kdev(vm.createDevice(KVM_DEV_TYPE_ARM_VGIC_V2))
53{
54    kdev.setAttr<uint64_t>(
55        KVM_DEV_ARM_VGIC_GRP_ADDR, KVM_VGIC_V2_ADDR_TYPE_DIST, dist_addr);
56    kdev.setAttr<uint64_t>(
57        KVM_DEV_ARM_VGIC_GRP_ADDR, KVM_VGIC_V2_ADDR_TYPE_CPU, cpu_addr);
58
59    kdev.setAttr<uint32_t>(KVM_DEV_ARM_VGIC_GRP_NR_IRQS, 0, it_lines);
60}
61
62KvmKernelGicV2::~KvmKernelGicV2()
63{
64}
65
66void
67KvmKernelGicV2::setSPI(unsigned spi)
68{
69    setIntState(KVM_ARM_IRQ_TYPE_SPI, 0, spi, true);
70}
71
72void
73KvmKernelGicV2::clearSPI(unsigned spi)
74{
75    setIntState(KVM_ARM_IRQ_TYPE_SPI, 0, spi, false);
76}
77
78void
79KvmKernelGicV2::setPPI(unsigned vcpu, unsigned ppi)
80{
81    setIntState(KVM_ARM_IRQ_TYPE_PPI, vcpu, ppi, true);
82}
83
84void
85KvmKernelGicV2::clearPPI(unsigned vcpu, unsigned ppi)
86{
87    setIntState(KVM_ARM_IRQ_TYPE_PPI, vcpu, ppi, false);
88}
89
90void
91KvmKernelGicV2::setIntState(unsigned type, unsigned vcpu, unsigned irq,
92                            bool high)
93{
94    assert(type <= KVM_ARM_IRQ_TYPE_MASK);
95    assert(vcpu <= KVM_ARM_IRQ_VCPU_MASK);
96    assert(irq <= KVM_ARM_IRQ_NUM_MASK);
97    const uint32_t line(
98        (type << KVM_ARM_IRQ_TYPE_SHIFT) |
99        (vcpu << KVM_ARM_IRQ_VCPU_SHIFT) |
100        (irq << KVM_ARM_IRQ_NUM_SHIFT));
101
102    vm.setIRQLine(line, high);
103}
104
105
106KvmGic::KvmGic(const KvmGicParams *p)
107    : BaseGic(p),
108      system(*p->system),
109      kernelGic(*p->kvmVM, p->cpu_addr, p->dist_addr, p->it_lines),
110      addrRanges{kernelGic.distRange, kernelGic.cpuRange}
111{
112}
113
114KvmGic::~KvmGic()
115{
116}
117
118void
119KvmGic::serialize(CheckpointOut &cp) const
120{
121    panic("Checkpointing unsupported\n");
122}
123
124void
125KvmGic::unserialize(CheckpointIn &cp)
126{
127    panic("Checkpointing unsupported\n");
128}
129
130Tick
131KvmGic::read(PacketPtr pkt)
132{
133    panic("KvmGic: PIO from gem5 is currently unsupported\n");
134}
135
136Tick
137KvmGic::write(PacketPtr pkt)
138{
139    panic("KvmGic: PIO from gem5 is currently unsupported\n");
140}
141
142void
143KvmGic::sendInt(uint32_t num)
144{
145    DPRINTF(Interrupt, "Set SPI %d\n", num);
146    kernelGic.setSPI(num);
147}
148
149void
150KvmGic::clearInt(uint32_t num)
151{
152    DPRINTF(Interrupt, "Clear SPI %d\n", num);
153    kernelGic.clearSPI(num);
154}
155
156void
157KvmGic::sendPPInt(uint32_t num, uint32_t cpu)
158{
159    DPRINTF(Interrupt, "Set PPI %d:%d\n", cpu, num);
160    kernelGic.setPPI(cpu, num);
161}
162
163void
164KvmGic::clearPPInt(uint32_t num, uint32_t cpu)
165{
166    DPRINTF(Interrupt, "Clear PPI %d:%d\n", cpu, num);
167    kernelGic.clearPPI(cpu, num);
168}
169
170void
171KvmGic::verifyMemoryMode() const
172{
173    if (!(system.isAtomicMode() && system.bypassCaches())) {
174        fatal("The in-kernel KVM GIC can only be used with KVM CPUs, but the "
175              "current memory mode does not support KVM.\n");
176    }
177}
178
179
180KvmGic *
181KvmGicParams::create()
182{
183    return new KvmGic(this);
184}
185