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Re: [Qemu-devel] [PATCH 1/3] hw/sd/pxa2xx_mmci: convert to SysBusDevice


From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH 1/3] hw/sd/pxa2xx_mmci: convert to SysBusDevice object
Date: Mon, 7 Sep 2015 17:42:13 +0100

On 7 September 2015 at 17:40, Markus Armbruster <address@hidden> wrote:
> Peter Maydell <address@hidden> writes:
>
>> Convert the pxa2xx_mmci device to be a sysbus device.

>> +static Property pxa2xx_mmci_properties[] = {
>> +    /* Note: pointer property 'drive' may remain NULL, thus no need
>> +     * for dc->cannot_instantiate_with_device_add_yet = true;
>> +     * Unfortunately this can't be a DEFINE_PROP_DRIVE, because
>> +     * setting a 'drive' property results in a call to blk_attach_dev()
>> +     * attaching the BlockBackend to this device; that then means that
>> +     * the call in sd_init() to blk_attach_dev_nofail() which tries to
>> +     * attach the BlockBackend to the SD card object aborts.
>> +     */
>> +    DEFINE_PROP_PTR("drive", PXA2xxMMCIState, blk),
>> +    DEFINE_PROP_END_OF_LIST(),
>> +};
>
> As far as I can tell, this problem is an artifact of our interface to
> the common sd-card code, namely sd_init().  sd_init() was made for the
> pre-qdev world: it creates and completely initializes the common
> SDState.
>
> In qdev, we do this in three separate steps: create, set properties,
> realize.  Split up sd_init(), and the problem should go away.

Yes, but I don't really want to gate QOMification of mmc
controller devices on the more complicated problem of
QOMifying sd.c itself, especially since we already have several
QOMified mmc controllers...

thanks
-- PMM



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