Re: [Qemu-devel] [RFC 1/2] hw/arm/virt: add a Calxeda XGMAC device

[Andreas Färber]

Hi,

Am 05.03.2014 05:27, schrieb Eric Auger:
> Hi Kim,
> 
> - Parameter 'driver' expects pluggable device type
> this can be fixed setting dc->cannot_instantiate_with_device_add_yet to
> false in vfio_platform_dev_class_init. You do not get the error anymore.
> However I must aknowledge I have not studies all possible side effects
> of this setting and maybe there is a cleaner way to achieve the same
> result.

If the realize/init function sets up MMIO mappings and IRQs itself
(rather than expecting the code instantiating the device to do so) then
you are free to set that field to false.

In this case that would be vbi->memmap[VIRT_ETHERNET].base in
create_ethernet(), so I have doubts.

Regards,
Andreas

> Then you can add additional properties in dc->props.
> - location of the device in gpa space and impact on RAM size: my
> understanding is that device could sit in another location than the
> hpa's one and you are not compelled to use the same address.
> - we effectively need to work on fdt tree generation for VFIO devices
> 
> Best Regards
> 
> Eric
> 
> 
> On 26 February 2014 03:37, Kim Phillips <address@hidden
> <mailto:address@hidden>> wrote:
> 
>     This is a hack and only serves as an example of what needs to be
>     done to make the next RFC - add vfio-platform support - work
>     for development purposes on a Calxeda Midway system.  We don't want
>     mach-virt to always create this ethernet device - DO NOT APPLY, etc.
> 
>     Initial attempts to convince QEMU to create a memory mapped device
>     on the command line (e.g., -device vfio-platform,name=fff51000.ethernet)
>     would fail with "Parameter 'driver' expects pluggable device type".
>     Any guidance as to how to overcome this apparent design limitation
>     is welcome.
> 
>     RAM is reduced from 30 to 1GiB such as to not overlap the xgmac device's
>     physical address.  Not sure if the 30GiB RAM (or whatever the user sets
>     it to with -m) could be set up above 0x1_0000_0000, but there is
>     probably
>     extra work needed to resolve this type of conflict.
> 
>     note: vfio-platform interrupt support development may want interrupt
>     property data filled; here it's omitted for the time being.
> 
>     Not-signed-off-by: Kim Phillips <address@hidden
>     <mailto:address@hidden>>
>     ---
>      hw/arm/virt.c | 24 +++++++++++++++++++++++-
>      1 file changed, 23 insertions(+), 1 deletion(-)
> 
>     diff --git a/hw/arm/virt.c b/hw/arm/virt.c
>     index 517f2fe..75edf33 100644
>     --- a/hw/arm/virt.c
>     +++ b/hw/arm/virt.c
>     @@ -65,6 +65,7 @@ enum {
>          VIRT_GIC_CPU,
>          VIRT_UART,
>          VIRT_MMIO,
>     +    VIRT_ETHERNET,
>      };
> 
>      typedef struct MemMapEntry {
>     @@ -106,7 +107,8 @@ static const MemMapEntry a15memmap[] = {
>          [VIRT_MMIO] = { 0xa000000, 0x200 },
>          /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of
>     that size */
>          /* 0x10000000 .. 0x40000000 reserved for PCI */
>     -    [VIRT_MEM] = { 0x40000000, 30ULL * 1024 * 1024 * 1024 },
>     +    [VIRT_MEM] = { 0x40000000, 1ULL * 1024 * 1024 * 1024 },
>     +    [VIRT_ETHERNET] = { 0xfff51000, 0x1000 },
>      };
> 
>      static const int a15irqmap[] = {
>     @@ -291,6 +293,25 @@ static void create_uart(const VirtBoardInfo
>     *vbi, qemu_irq *pic)
>          g_free(nodename);
>      }
> 
>     +static void create_ethernet(const VirtBoardInfo *vbi, qemu_irq *pic)
>     +{
>     +    char *nodename;
>     +    hwaddr base = vbi->memmap[VIRT_ETHERNET].base;
>     +    hwaddr size = vbi->memmap[VIRT_ETHERNET].size;
>     +    const char compat[] = "calxeda,hb-xgmac";
>     +
>     +    sysbus_create_simple("vfio-platform", base, NULL);
>     +
>     +    nodename = g_strdup_printf("/address@hidden" PRIx64, base);
>     +    qemu_fdt_add_subnode(vbi->fdt, nodename);
>     +
>     +    /* Note that we can't use setprop_string because of the
>     embedded NUL */
>     +    qemu_fdt_setprop(vbi->fdt, nodename, "compatible", compat,
>     sizeof(compat));
>     +    qemu_fdt_setprop_sized_cells(vbi->fdt, nodename, "reg", 2,
>     base, 2, size);
>     +
>     +    g_free(nodename);
>     +}
>     +
>      static void create_virtio_devices(const VirtBoardInfo *vbi,
>     qemu_irq *pic)
>      {
>          int i;
>     @@ -419,6 +440,7 @@ static void machvirt_init(QEMUMachineInitArgs *args)
>          }
> 
>          create_uart(vbi, pic);
>     +    create_ethernet(vbi, pic);
> 
>          /* Create mmio transports, so the user can create virtio backends
>           * (which will be automatically plugged in to the transports). If
>     --
>     1.9.0
> 
> 


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