host.cc

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/*
 * Copyright (c) 2015 ARM Limited
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 *
 * The license below extends only to copyright in the software and shall
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 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
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 * met: redistributions of source code must retain the above copyright
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 */
 
#include "dev/pci/host.hh"
 
#include <utility>
 
#include "debug/PciHost.hh"
#include "dev/pci/device.hh"
#include "dev/platform.hh"
#include "params/GenericPciHost.hh"
#include "params/PciHost.hh"
 
PciHost::PciHost(const PciHostParams *p)
    : PioDevice(p)
{
}
 
PciHost::~PciHost()
{
}
 
PciHost::DeviceInterface
PciHost::registerDevice(PciDevice *device, PciBusAddr bus_addr, PciIntPin pin)
{
    auto map_entry = devices.emplace(bus_addr, device);
 
    DPRINTF(PciHost, "%02x:%02x.%i: Registering device\n",
            bus_addr.bus, bus_addr.dev, bus_addr.func);
 
    fatal_if(!map_entry.second,
             "%02x:%02x.%i: PCI bus ID collision\n",
             bus_addr.bus, bus_addr.dev, bus_addr.func);
 
    return DeviceInterface(*this, bus_addr, pin);
}
 
PciDevice *
PciHost::getDevice(const PciBusAddr &addr)
{
    auto device = devices.find(addr);
    return device != devices.end() ? device->second : nullptr;
}
 
const PciDevice *
PciHost::getDevice(const PciBusAddr &addr) const
{
    auto device = devices.find(addr);
    return device != devices.end() ? device->second : nullptr;
}
 
PciHost::DeviceInterface::DeviceInterface(
    PciHost &_host,
    PciBusAddr &bus_addr, PciIntPin interrupt_pin)
    : host(_host),
      busAddr(bus_addr), interruptPin(interrupt_pin)
{
}
 
const std::string
PciHost::DeviceInterface::name() const
{
    return csprintf("%s.interface[%02x:%02x.%i]",
                    host.name(), busAddr.bus, busAddr.dev, busAddr.func);
}
 
void
PciHost::DeviceInterface::postInt()
{
    DPRINTF(PciHost, "postInt\n");
 
    host.postInt(busAddr, interruptPin);
}
 
void
PciHost::DeviceInterface::clearInt()
{
    DPRINTF(PciHost, "clearInt\n");
 
    host.clearInt(busAddr, interruptPin);
}
 
 
GenericPciHost::GenericPciHost(const GenericPciHostParams *p)
    : PciHost(p),
      platform(*p->platform),
      confBase(p->conf_base), confSize(p->conf_size),
      confDeviceBits(p->conf_device_bits),
      pciPioBase(p->pci_pio_base), pciMemBase(p->pci_mem_base),
      pciDmaBase(p->pci_dma_base)
{
}
 
GenericPciHost::~GenericPciHost()
{
}
 
 
Tick
GenericPciHost::read(PacketPtr pkt)
{
    const auto dev_addr(decodeAddress(pkt->getAddr() - confBase));
    const Addr size(pkt->getSize());
 
    DPRINTF(PciHost, "%02x:%02x.%i: read: offset=0x%x, size=0x%x\n",
            dev_addr.first.bus, dev_addr.first.dev, dev_addr.first.func,
            dev_addr.second,
            size);
 
    PciDevice *const pci_dev(getDevice(dev_addr.first));
    if (pci_dev) {
        // @todo Remove this after testing
        pkt->headerDelay = pkt->payloadDelay = 0;
        return pci_dev->readConfig(pkt);
    } else {
        uint8_t *pkt_data(pkt->getPtr<uint8_t>());
        std::fill(pkt_data, pkt_data + size, 0xFF);
        pkt->makeAtomicResponse();
        return 0;
    }
}
 
Tick
GenericPciHost::write(PacketPtr pkt)
{
    const auto dev_addr(decodeAddress(pkt->getAddr() - confBase));
 
    DPRINTF(PciHost, "%02x:%02x.%i: write: offset=0x%x, size=0x%x\n",
            dev_addr.first.bus, dev_addr.first.dev, dev_addr.first.func,
            dev_addr.second,
            pkt->getSize());
 
    PciDevice *const pci_dev(getDevice(dev_addr.first));
    panic_if(!pci_dev,
             "%02x:%02x.%i: Write to config space on non-existent PCI device\n",
             dev_addr.first.bus, dev_addr.first.dev, dev_addr.first.func);
 
    // @todo Remove this after testing
    pkt->headerDelay = pkt->payloadDelay = 0;
 
    return pci_dev->writeConfig(pkt);
}
 
AddrRangeList
GenericPciHost::getAddrRanges() const
{
    return AddrRangeList({ RangeSize(confBase, confSize) });
}
 
std::pair<PciBusAddr, Addr>
GenericPciHost::decodeAddress(Addr addr)
{
    const Addr offset(addr & mask(confDeviceBits));
    const Addr bus_addr(addr >> confDeviceBits);
 
    return std::make_pair(
        PciBusAddr(bits(bus_addr, 15, 8),
                   bits(bus_addr,  7, 3),
                   bits(bus_addr,  2, 0)),
        offset);
}
 
 
void
GenericPciHost::postInt(const PciBusAddr &addr, PciIntPin pin)
{
    platform.postPciInt(mapPciInterrupt(addr, pin));
}
 
void
GenericPciHost::clearInt(const PciBusAddr &addr, PciIntPin pin)
{
    platform.clearPciInt(mapPciInterrupt(addr, pin));
}
 
 
uint32_t
GenericPciHost::mapPciInterrupt(const PciBusAddr &addr, PciIntPin pin) const
{
    const PciDevice *dev(getDevice(addr));
    assert(dev);
 
    return dev->interruptLine();
}
 
 
GenericPciHost *
GenericPciHostParams::create()
{
    return new GenericPciHost(this);
}