Hi Jan,
Thanks for the reply. I am using the uio driver and when I load it, the pci
devices become enabled. I suppose this part is ok:
lspci -v after the driver is loaded:
00:00.0 Unassigned class [ff00]: Red Hat, Inc Inter-VM shared memory
Subsystem: Red Hat, Inc Inter-VM shared memory
Flags: bus master, fast devsel, latency 0, IRQ 38
Memory at fc100000 (64-bit, non-prefetchable) [size=256]
Kernel driver in use: uio_ivshmem
00:01.0 Unassigned class [ff01]: Red Hat, Inc Inter-VM shared memory
Subsystem: Red Hat, Inc Inter-VM shared memory
Flags: bus master, fast devsel, latency 0, IRQ 39
Memory at fc100100 (64-bit, non-prefetchable) [size=256]
Kernel driver in use: uio_ivshmem
I got the code available here (https://github.com/evidence/linux-jailhouse-tx1)
that has an ivshmem demo on arm. I basically copied and pasted the
pci_read_config and pci_write_config functions in the
inmates/lib/arm-common/pci.c (had to change some makefiles to compile the code
because of the pci.c file).
However, I am getting an Unhandled data read at 0xfc100000, which is the
address of the 00:00.0 device, during the execution of the function
pci_find_device().
If a decrease the while value test in the pci_find_device() function (bdf <
0x10000), it does not find any PCI device (obviously) and there is no error.
start_bdf is initially defined as 0xfc000000, as configured in the root cell
(.pci_mmconfig_base = 0xfc000000).
Any suggestion?
Giovani
> On 2018-04-10 16:39, Giovani Gracioli wrote:
> > Updating:
> >
> > I added
> >
> > .num_msix_vectors = 1,
> > .iommu = 1,
> >
> > to the root cell .pci_devices config, wrote a simple linux program to write
> > to the shared memory (0x800500000) and a simple inmate cell code to read
> > from the shared memory. It was able to read the values that were written.
> >
> > The next step is how to generate interrupts among the cells. I tried to use
> > the pci functions (the same used in the ivshmem-demo) on the arm64 but got
> > an error. The lib/pci.c is not compiled by arm64.
> >
> > How should I discover the pci device and send/receive interrupts on arm64?
> >
>
> ivshmem demo inmate for ARM/ARM64 is still work in progress. Henning, is
> there any intermediate step we can point to?
>
> You could start your tests between two Linux cells, meanwhile, using the
> uio driver.
>
> Jan
>
> --
> Siemens AG, Corporate Technology, CT RDA IOT SES-DE
> Corporate Competence Center Embedded Linux
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