Re: [Qemu-devel] [PATCH v3 4/5] Enable fw_cfg DMA interface for ARM

["Marc Marí" <markmb@redhat.com>]

On Fri, 18 Sep 2015 22:16:46 +0200
Laszlo Ersek <lersek@redhat.com> wrote:

> On 09/18/15 10:58, Marc Marí wrote:
> > Enable the fw_cfg DMA interface for the ARM virt machine.
> > 
> > Based on Gerd Hoffman's initial implementation.
> > 
> > Signed-off-by: Marc Marí <markmb@redhat.com>
> > ---
> >  hw/arm/virt.c | 9 +++++----
> >  1 file changed, 5 insertions(+), 4 deletions(-)
> > 
> > diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> > index 3568107..47f4ad3 100644
> > --- a/hw/arm/virt.c
> > +++ b/hw/arm/virt.c
> > @@ -113,7 +113,7 @@ static const MemMapEntry a15memmap[] = {
> >      [VIRT_GIC_V2M] =            { 0x08020000, 0x00001000 },
> >      [VIRT_UART] =               { 0x09000000, 0x00001000 },
> >      [VIRT_RTC] =                { 0x09010000, 0x00001000 },
> > -    [VIRT_FW_CFG] =             { 0x09020000, 0x0000000a },
> > +    [VIRT_FW_CFG] =             { 0x09020000, 0x00000014 },
> 
> Okay, Laszlo is the hateful reviewer. Sorry about that. I'm late, yes.
> 
> But: this says 0x00000014, ie 20 bytes in decimal. I don't think
> that's correct; it should be 0x18 -- 24 bytes in decimal. From patch
> #2: "DMA Address address:       Base + 16 (8 bytes)".

It's not your problem if I don't know how to count. So don't
apologize :).

And it's better to catch this stupid little mistakes now.

Thanks
Marc

> Thanks (and I'm sorry about being late!)
> Laszlo
> 
> >      [VIRT_MMIO] =               { 0x0a000000, 0x00000200 },
> >      /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of
> > that size */ [VIRT_PLATFORM_BUS] =       { 0x0c000000, 0x02000000 },
> > @@ -651,13 +651,13 @@ static void create_flash(const VirtBoardInfo
> > *vbi) g_free(nodename);
> >  }
> >  
> > -static void create_fw_cfg(const VirtBoardInfo *vbi)
> > +static void create_fw_cfg(const VirtBoardInfo *vbi, AddressSpace
> > *as) {
> >      hwaddr base = vbi->memmap[VIRT_FW_CFG].base;
> >      hwaddr size = vbi->memmap[VIRT_FW_CFG].size;
> >      char *nodename;
> >  
> > -    fw_cfg_init_mem_wide(base + 8, base, 8, 0, NULL);
> > +    fw_cfg_init_mem_wide(base + 8, base, 8, base + 16, as);
> >  
> >      nodename = g_strdup_printf("/fw-cfg@%" PRIx64, base);
> >      qemu_fdt_add_subnode(vbi->fdt, nodename);
> > @@ -919,6 +919,7 @@ static void machvirt_init(MachineState *machine)
> >  
> >      create_fdt(vbi);
> >  
> > +
> >      for (n = 0; n < smp_cpus; n++) {
> >          ObjectClass *oc = cpu_class_by_name(TYPE_ARM_CPU,
> > cpustr[0]); CPUClass *cc = CPU_CLASS(oc);
> > @@ -984,7 +985,7 @@ static void machvirt_init(MachineState *machine)
> >       */
> >      create_virtio_devices(vbi, pic);
> >  
> > -    create_fw_cfg(vbi);
> > +    create_fw_cfg(vbi, &address_space_memory);
> >      rom_set_fw(fw_cfg_find());
> >  
> >      guest_info->smp_cpus = smp_cpus;
> > 
>