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Re: [Qemu-devel] [PATCH 06/15] piix: create i8254 through composition
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [PATCH 06/15] piix: create i8254 through composition |
Date: |
Tue, 31 Jan 2012 15:51:55 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2012-01-31 15:47, Anthony Liguori wrote:
> On 01/31/2012 08:34 AM, Jan Kiszka wrote:
>> On 2012-01-26 20:00, Anthony Liguori wrote:
>>> @@ -548,6 +550,13 @@ static int piix3_realize(PCIDevice *dev)
>>> /* Setup the RTC IRQ */
>>> s->rtc.irq = rtc_irq;
>>>
>>> + /* Realize the PIT */
>>> + qdev_set_parent_bus(DEVICE(&s->pit), BUS(s->bus));
>>> + qdev_init_nofail(DEVICE(&s->pit));
>>> +
>>> + /* FIXME this should be refactored */
>>> + pcspk_init(ISA_DEVICE(&s->pit));
>>
>> Fixing ATM, ie. converting to qdev/QOM.
>>
>> Q: How do I use qdev_property_add_link& Co. to establish the relation
>> from the speaker port device to the PIT?
>
> In the state structure, have:
>
> struct PCSpkState {
> ...
> PITState *pit;
> };
>
> In the pcspk instance_init, do:
>
> object_property_add_link(obj, "pit", TYPE_PIT, (Object **)&s->pit, NULL);
>
> In the pcspk realize function (DeviceClass::init), do:
>
> assert(s->pit != NULL); // make sure the pit link is set
>
> And that's it.
>
> You can set the s->pit field directly. You are not required to use any
> special
> QOM function to interact with link properties.
>
> BTW, this is yet another benefit of making structures public. You can take
> the
> address of a child and set link fields directly without accessors.
Well, that has two sides. We introduced properties to avoid this direct
messing.
Does linking also work without exposing internals?
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
- Re: [Qemu-devel] [PATCH 01/15] pc: merge pc_piix.c into pc.c, (continued)
- Re: [Qemu-devel] [PATCH 01/15] pc: merge pc_piix.c into pc.c, Anthony Liguori, 2012/01/27
- Re: [Qemu-devel] [PATCH 01/15] pc: merge pc_piix.c into pc.c, Jan Kiszka, 2012/01/27
- Re: [Qemu-devel] [PATCH 01/15] pc: merge pc_piix.c into pc.c, Anthony Liguori, 2012/01/27
- Re: [Qemu-devel] [PATCH 01/15] pc: merge pc_piix.c into pc.c, Jan Kiszka, 2012/01/27
- Re: [Qemu-devel] [PATCH 01/15] pc: merge pc_piix.c into pc.c, Anthony Liguori, 2012/01/27
- Re: [Qemu-devel] [PATCH 01/15] pc: merge pc_piix.c into pc.c, Andreas Färber, 2012/01/27
- Re: [Qemu-devel] [PATCH 01/15] pc: merge pc_piix.c into pc.c, Anthony Liguori, 2012/01/27
[Qemu-devel] [PATCH 06/15] piix: create i8254 through composition, Anthony Liguori, 2012/01/26
- Re: [Qemu-devel] [PATCH 06/15] piix: create i8254 through composition, Jan Kiszka, 2012/01/31
- Re: [Qemu-devel] [PATCH 06/15] piix: create i8254 through composition, Anthony Liguori, 2012/01/31
- Re: [Qemu-devel] [PATCH 06/15] piix: create i8254 through composition,
Jan Kiszka <=
- Re: [Qemu-devel] [PATCH 06/15] piix: create i8254 through composition, Anthony Liguori, 2012/01/31
- Re: [Qemu-devel] [PATCH 06/15] piix: create i8254 through composition, Jan Kiszka, 2012/01/31
- Re: [Qemu-devel] [PATCH 06/15] piix: create i8254 through composition, Anthony Liguori, 2012/01/31
- Re: [Qemu-devel] [PATCH 06/15] piix: create i8254 through composition, Jan Kiszka, 2012/01/31
Re: [Qemu-devel] [PATCH 06/15] piix: create i8254 through composition, Paolo Bonzini, 2012/01/31
Re: [Qemu-devel] [PATCH 06/15] piix: create i8254 through composition, Jan Kiszka, 2012/01/31
Re: [Qemu-devel] [PATCH 06/15] piix: create i8254 through composition, Anthony Liguori, 2012/01/31
Re: [Qemu-devel] [PATCH 06/15] piix: create i8254 through composition, Jan Kiszka, 2012/01/31
Re: [Qemu-devel] [PATCH 06/15] piix: create i8254 through composition, Anthony Liguori, 2012/01/31
Re: [Qemu-devel] [PATCH 06/15] piix: create i8254 through composition, Paolo Bonzini, 2012/01/31