host.cc revision 11260 
1/*
2 * Copyright (c) 2015 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 "dev/pci/host.hh"
41
42#include <utility>
43
44#include "debug/PciHost.hh"
45#include "dev/pci/device.hh"
46#include "dev/platform.hh"
47#include "params/GenericPciHost.hh"
48#include "params/PciHost.hh"
49
50
51PciHost::PciHost(const PciHostParams *p)
52    : PioDevice(p)
53{
54}
55
56PciHost::~PciHost()
57{
58}
59
60PciHost::DeviceInterface
61PciHost::registerDevice(PciDevice *device, PciBusAddr bus_addr, PciIntPin pin)
62{
63    auto map_entry = devices.emplace(bus_addr, device);
64
65    DPRINTF(PciHost, "%02x:%02x.%i: Registering device\n",
66            bus_addr.bus, bus_addr.dev, bus_addr.func);
67
68    fatal_if(!map_entry.second,
69             "%02x:%02x.%i: PCI bus ID collision\n",
70             bus_addr.bus, bus_addr.dev, bus_addr.func);
71
72    return DeviceInterface(*this, bus_addr, pin);
73}
74
75PciDevice *
76PciHost::getDevice(const PciBusAddr &addr)
77{
78    auto device = devices.find(addr);
79    return device != devices.end() ? device->second : nullptr;
80}
81
82const PciDevice *
83PciHost::getDevice(const PciBusAddr &addr) const
84{
85    auto device = devices.find(addr);
86    return device != devices.end() ? device->second : nullptr;
87}
88
89PciHost::DeviceInterface::DeviceInterface(
90    PciHost &_host,
91    PciBusAddr &bus_addr, PciIntPin interrupt_pin)
92    : host(_host),
93      busAddr(bus_addr), interruptPin(interrupt_pin)
94{
95}
96
97const std::string
98PciHost::DeviceInterface::name() const
99{
100    return csprintf("%s.interface[%02x:%02x.%i]",
101                    host.name(), busAddr.bus, busAddr.dev, busAddr.func);
102}
103
104void
105PciHost::DeviceInterface::postInt()
106{
107    DPRINTF(PciHost, "postInt\n");
108
109    host.postInt(busAddr, interruptPin);
110}
111
112void
113PciHost::DeviceInterface::clearInt()
114{
115    DPRINTF(PciHost, "clearInt\n");
116
117    host.clearInt(busAddr, interruptPin);
118}
119
120
121GenericPciHost::GenericPciHost(const GenericPciHostParams *p)
122    : PciHost(p),
123      platform(*p->platform),
124      confBase(p->conf_base), confSize(p->conf_size),
125      confDeviceBits(p->conf_device_bits),
126      pciPioBase(p->pci_pio_base), pciMemBase(p->pci_mem_base),
127      pciDmaBase(p->pci_dma_base)
128{
129}
130
131GenericPciHost::~GenericPciHost()
132{
133}
134
135
136Tick
137GenericPciHost::read(PacketPtr pkt)
138{
139    const auto dev_addr(decodeAddress(pkt->getAddr() - confBase));
140    const Addr size(pkt->getSize());
141
142    DPRINTF(PciHost, "%02x:%02x.%i: read: offset=0x%x, size=0x%x\n",
143            dev_addr.first.bus, dev_addr.first.dev, dev_addr.first.func,
144            dev_addr.second,
145            size);
146
147    PciDevice *const pci_dev(getDevice(dev_addr.first));
148    if (pci_dev) {
149        // @todo Remove this after testing
150        pkt->headerDelay = pkt->payloadDelay = 0;
151        return pci_dev->readConfig(pkt);
152    } else {
153        uint8_t *pkt_data(pkt->getPtr<uint8_t>());
154        std::fill(pkt_data, pkt_data + size, 0xFF);
155        pkt->makeAtomicResponse();
156        return 0;
157    }
158}
159
160Tick
161GenericPciHost::write(PacketPtr pkt)
162{
163    const auto dev_addr(decodeAddress(pkt->getAddr() - confBase));
164
165    DPRINTF(PciHost, "%02x:%02x.%i: write: offset=0x%x, size=0x%x\n",
166            dev_addr.first.bus, dev_addr.first.dev, dev_addr.first.func,
167            dev_addr.second,
168            pkt->getSize());
169
170    PciDevice *const pci_dev(getDevice(dev_addr.first));
171    panic_if(!pci_dev,
172             "%02x:%02x.%i: Write to config space on non-existent PCI device\n",
173             dev_addr.first.bus, dev_addr.first.dev, dev_addr.first.func);
174
175    // @todo Remove this after testing
176    pkt->headerDelay = pkt->payloadDelay = 0;
177
178    return pci_dev->writeConfig(pkt);
179}
180
181AddrRangeList
182GenericPciHost::getAddrRanges() const
183{
184    return AddrRangeList({ RangeSize(confBase, confSize) });
185}
186
187std::pair<PciBusAddr, Addr>
188GenericPciHost::decodeAddress(Addr addr)
189{
190    const Addr offset(addr & mask(confDeviceBits));
191    const Addr bus_addr(addr >> confDeviceBits);
192
193    return std::make_pair(
194        PciBusAddr(bits(bus_addr, 15, 8),
195                   bits(bus_addr,  7, 3),
196                   bits(bus_addr,  2, 0)),
197        offset);
198}
199
200
201void
202GenericPciHost::postInt(const PciBusAddr &addr, PciIntPin pin)
203{
204    platform.postPciInt(mapPciInterrupt(addr, pin));
205}
206
207void
208GenericPciHost::clearInt(const PciBusAddr &addr, PciIntPin pin)
209{
210    platform.clearPciInt(mapPciInterrupt(addr, pin));
211}
212
213
214uint32_t
215GenericPciHost::mapPciInterrupt(const PciBusAddr &addr, PciIntPin pin) const
216{
217    const PciDevice *dev(getDevice(addr));
218    assert(dev);
219
220    return dev->interruptLine();
221}
222
223
224GenericPciHost *
225GenericPciHostParams::create()
226{
227    return new GenericPciHost(this);
228}
229