[gem5-users] RISC-V Full system Linux PCI

[Νικόλαος Ταμπουρατζής via gem5-users]

Dear community,

I would like to use the IGbE_e1000 card with RISC-V Linux Full System  
Simulation. As I read in this link  
(https://gem5.googlesource.com/public/gem5/+/refs/heads/stable/RELEASE-NOTES.md) gem5 v21.0 release includes RISC-V Full system Linux boot  
support!

So, I contact Peter Yuen and he sends me the binaries, images,  
bootloader etc. As a result, I simulate a Full Linux RISCV.  
Specifically, I use the prebuilt files from here:  
https://github.com/ppeetteerrs/gem5-RISC-V-FS-Linux/ (to be noticed  
that following his instructions - Section 4, I build my own files and  
working properly).

Here is the cmd: build/RISCV/gem5.opt -d $RISCV/logs  
configs/example/riscv/fs_linux.py --kernel=$OUT/bbl --caches  
--mem-size=256MB --mem-type=DDR4_2400_8x8 --cpu-type=AtomicSimpleCPU  
--disk-image=$OUT/riscv_parsec_disk -n 1

However, as you can see in the file src/dev/riscv/HiFive.py there is  
not implemented PCI interface yet. I try to add it in order to connect  
the IGbE_e1000 ethernet card but I cannot achieve it. I do the  
following:

1) Add the src/dev/riscv/pci_host.hh file:

#ifndef __DEV_RISCV_PCI_HOST_HH__
#define __DEV_RISCV_PCI_HOST_HH__

#include "dev/pci/host.hh"

struct GenericRiscvPciHostParams;

class GenericRiscvPciHost : public GenericPciHost
{
  private:
    int intBase;

  public:
    GenericRiscvPciHost(const GenericRiscvPciHostParams &p);
    virtual ~GenericRiscvPciHost() {}

  protected:
    uint32_t mapPciInterrupt(const PciBusAddr &addr, PciIntPin pin)  
const override;
};

#endif // __DEV_RISCV_PCI_HOST_HH__

2) Add the src/dev/riscv/pci_host.cc file:

#include "dev/riscv/pci_host.hh"

#include "params/GenericRiscvPciHost.hh"

GenericRiscvPciHost::GenericRiscvPciHost(const GenericRiscvPciHostParams &p)
    : GenericPciHost(p), intBase(p.int_base)
{
}

uint32_t
GenericRiscvPciHost::mapPciInterrupt(
    const PciBusAddr &addr, PciIntPin pin) const
{
    return (intBase + (uint8_t)pin);
}

3) Add "Source('pci_host.cc')" to Sconscript

4) Add the following in the src/dev/riscv/HiFive.py

class GenericRiscvPciHost(GenericPciHost):
    type = 'GenericRiscvPciHost'
    cxx_header = "dev/riscv/pci_host.hh"
    int_base = Param.Int(0x20,
        "Base number used as interrupt line and PLIC source.")

5) Add in class HiFive(Platform):

pci_host = GenericRiscvPciHost(conf_base=0x30000000, conf_size='256MB',
        conf_device_bits=12, pci_pio_base=0x2f000000)

ethernet = IGbE_e1000(pci_bus=0, pci_dev=0, pci_func=0,
                                   InterruptLine=1, InterruptPin=1)


6) Add in gem5/configs/example/riscv/fs_linux.py the following:

range_list = system.platform._off_chip_ranges()
range_list.append(AddrRange(0x2f000000, 0x5fffffff))
system.bridge.ranges = range_list

system.platform.pci_host.pio = system.iobus.mem_side_ports
system.platform.ethernet.host = system.platform.pci_host
system.platform.ethernet.pio = system.iobus.mem_side_ports
system.platform.ethernet.dma = system.iobus.cpu_side_ports

7) Add the following in the dts which is produced from auto  
generateDeviceTree:

pci@30000000 {
                        compatible = "pci-host-ecam-generic";
                        device_type = "pci";
                        #address-cells = <0x3>;
                        #size-cells = <0x2>;
                        #interrupt-cells = <0x1>;
                        reg = <0x0 0x30000000 0x0 0x10000000>;
			ranges = <0x1000000 0x0 0x0 0x0 0x2f000000 0x0 0x10000 0x2000000  
0x0 0x40000000 0x0 0x40000000 0x0 0x10000000>;
			interrupt-map = <0x0 0x0 0x0 0x1 0x2 0x20 0x0 0x0 0x0 0x2 0x2 0x21  
0x0 0x0 0x0 0x3 0x2 0x22 0x0 0x0 0x0 0x4 0x2 0x23 0x800 0x0 0x0 0x1  
0x2 0x21 0x800 0x0 0x0 0x2 0x2 0x22 0x800 0x0 0x0 0x3 0x2 0x23 0x800  
0x0 0x0 0x4 0x2 0x20 0x1000 0x0 0x0 0x1 0x2 0x22 0x1000 0x0 0x0 0x2  
0x2 0x23 0x1000 0x0 0x0 0x3 0x2 0x20 0x1000 0x0 0x0 0x4 0x2 0x21  
0x1800 0x0 0x0 0x1 0x2 0x23 0x1800 0x0 0x0 0x2 0x2 0x20 0x1800 0x0 0x0  
0x3 0x2 0x21 0x1800 0x0 0x0 0x4 0x2 0x22>;
                        interrupt-map-mask = <0x1800 0x0 0x0 0xffffffff>;
                        dma-coherent;
                        bus-range = <0x0 0xff>;
                        linux,pci-domain = <0x0>;
                };

However, when I try to connect the IGbE_e1000 I get:

panic: invalid access size(?) for PCI configspace!

I would appreciate it if anyone would like to help me please! :)

Best regards,
Nikolaos


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