Re: [Qemu-devel] [RESEND][PATCH 2/9] PCMCIA: start qdev'ication

[andrzej zaborowski <balrogg@gmail.com>]

Hi Dmitry,

On 25 April 2011 11:06, Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> wrote:
> Convert PCMCIA bus handling code to use QBus internally.
> MicroDrive code is still unaffected.
>
> Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
> ---
>  Makefile.objs      |    3 ++
>  hw/pcmcia.c        |  102 ++++++++++++++++++++++++++++++++++++++++++++++++++++
>  hw/pcmcia.h        |   15 +++++++-
>  hw/pxa2xx_pcmcia.c |    2 +-
>  vl.c               |   43 ----------------------
>  5 files changed, 120 insertions(+), 45 deletions(-)
>  create mode 100644 hw/pcmcia.c
>
> diff --git a/Makefile.objs b/Makefile.objs
> index 44ce368..153a148 100644
> --- a/Makefile.objs
> +++ b/Makefile.objs
> @@ -289,6 +289,9 @@ hw-obj-$(CONFIG_REALLY_VIRTFS) += virtio-9p-debug.o
>  hw-obj-$(CONFIG_VIRTFS) += virtio-9p-local.o virtio-9p-xattr.o
>  hw-obj-$(CONFIG_VIRTFS) += virtio-9p-xattr-user.o virtio-9p-posix-acl.o
>
> +# PCMCIA
> +hw-obj-y += pcmcia.o
> +
>  ######################################################################
>  # libdis
>  # NOTE: the disassembler code is only needed for debugging
> diff --git a/hw/pcmcia.c b/hw/pcmcia.c
> new file mode 100644
> index 0000000..17a49b6
> --- /dev/null
> +++ b/hw/pcmcia.c
> @@ -0,0 +1,102 @@
> +/*
> + * QEMU System Emulator
> + * PCMCIA subsystem
> + *
> + * Copyright (c) 2003-2008 Fabrice Bellard
> + * Copyright (c) 2011 Dmitry Eremin-Solenikov
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a copy
> + * of this software and associated documentation files (the "Software"), to deal
> + * in the Software without restriction, including without limitation the rights
> + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
> + * copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
> + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
> + * THE SOFTWARE.
> + */
> +#include "hw.h"
> +#include "pcmcia.h"
> +#include "monitor.h"
> +
> +/***********************************************************/
> +/* PCMCIA/Cardbus */
> +
> +static struct pcmcia_socket_entry_s {
> +    PCMCIASocket *socket;
> +    struct pcmcia_socket_entry_s *next;
> +} *pcmcia_sockets = 0;
> +
> +static BusInfo pcmcia_bus_info = {
> +    .name       = "PCMCIA",
> +    .size       = sizeof(PCMCIASocket),
> +};
> +
> +void pcmcia_socket_register(PCMCIASocket *socket, DeviceState *parent)
> +{
> +    struct pcmcia_socket_entry_s *entry;
> +
> +    qbus_create_inplace(&socket->qbus, &pcmcia_bus_info,
> +                    parent, "pcmcia");
> +
> +    entry = qemu_malloc(sizeof(struct pcmcia_socket_entry_s));
> +    entry->socket = socket;
> +    entry->next = pcmcia_sockets;
> +    pcmcia_sockets = entry;
> +}
> +
> +void pcmcia_socket_unregister(PCMCIASocket *socket)
> +{
> +    struct pcmcia_socket_entry_s *entry, **ptr;
> +
> +    ptr = &pcmcia_sockets;
> +    for (entry = *ptr; entry; ptr = &entry->next, entry = *ptr)
> +        if (entry->socket == socket) {
> +            *ptr = entry->next;
> +            qemu_free(entry);
> +        }

I think you need a "break" here, or something else.  Otherwise you'll
be accessing entry->next incorrectly.  (I notice that this error is
present in the current code too)

It would also be great if someone with understanding of qbus could ack
the rest of this patch.

Out of curiosity, In the patch 1/9 can you include pxa.h instead of
moving the declaration out of pxa.h?

I also want to remind you that (iirc) the tosa code was merged in a
rather incomplete state, like the collie, kind of on the condition
that it would be worked on for stuff like audio/video soon after ;)

Cheers