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Re: [Qemu-devel] [PATCH v3 09/10] isa: Clean up use of cannot_instantiat
From: |
Marcel Apfelbaum |
Subject: |
Re: [Qemu-devel] [PATCH v3 09/10] isa: Clean up use of cannot_instantiate_with_device_add_yet |
Date: |
Thu, 31 Oct 2013 14:44:30 +0200 |
On Wed, 2013-10-30 at 17:28 +0100, address@hidden wrote:
> From: Markus Armbruster <address@hidden>
>
> Drop it when there's no obvious reason why device_add could not work.
> Else keep and document why.
>
> * isa-fdc: drop
>
> * i8042: drop, even though its I/O base is hardcoded (because you
> could conceivably still add one to a board that has none), and even
> though PC board code wires up the A20 line (because that wiring is
> optional)
>
> * port92: keep because it needs additional wiring by port92_init()
>
> * mc146818rtc: keep because it needs to be wired up by rtc_init()
>
> * m48t59_isa: keep because needs to be wired up by m48t59_init_isa()
>
> * isa-pit, kvm-pit: keep (in their abstract base pic-common) because
> the PIT needs additional wiring by board code, depending on HPET
> presence
>
> * pcspk: keep because of pointer property pit, and because realize
> sets global pcspk_state
>
> * vmmouse: keep because of pointer property ps2_mouse
>
> * vmport: keep because realize sets global port_state
>
> * isa-i8259, kvm-i8259: keep (in their abstract base pic-common),
> because the PICs' IRQ input lines are set up by board code, and the
> wiring of the slave to the master is hard-coded in device model code
I agree with the intend of this patch, but I am not familiar
with this code, so I am not comfortable reviewing it, anyone else?
Thanks,
Marcel
>
> Signed-off-by: Markus Armbruster <address@hidden>
> ---
> hw/audio/pcspk.c | 3 ++-
> hw/block/fdc.c | 1 -
> hw/i386/pc.c | 7 ++++++-
> hw/input/pckbd.c | 1 -
> hw/input/vmmouse.c | 3 ++-
> hw/intc/i8259_common.c | 8 +++++++-
> hw/misc/vmport.c | 3 ++-
> hw/timer/i8254_common.c | 7 ++++++-
> hw/timer/m48t59.c | 3 ++-
> hw/timer/mc146818rtc.c | 3 ++-
> 10 files changed, 29 insertions(+), 10 deletions(-)
>
> diff --git a/hw/audio/pcspk.c b/hw/audio/pcspk.c
> index 8e3e178..f980d66 100644
> --- a/hw/audio/pcspk.c
> +++ b/hw/audio/pcspk.c
> @@ -192,8 +192,9 @@ static void pcspk_class_initfn(ObjectClass *klass, void
> *data)
>
> dc->realize = pcspk_realizefn;
> set_bit(DEVICE_CATEGORY_SOUND, dc->categories);
> - dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why
> */
> dc->props = pcspk_properties;
> + /* Reason: pointer property "pit", realize sets global pcspk_state */
> + dc->cannot_instantiate_with_device_add_yet = true;
> }
>
> static const TypeInfo pcspk_info = {
> diff --git a/hw/block/fdc.c b/hw/block/fdc.c
> index 86f4920..592b58f 100644
> --- a/hw/block/fdc.c
> +++ b/hw/block/fdc.c
> @@ -2234,7 +2234,6 @@ static void isabus_fdc_class_init(ObjectClass *klass,
> void *data)
>
> dc->realize = isabus_fdc_realize;
> dc->fw_name = "fdc";
> - dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why
> */
> dc->reset = fdctrl_external_reset_isa;
> dc->vmsd = &vmstate_isa_fdc;
> dc->props = isa_fdc_properties;
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index fe33843..20402ba 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -544,10 +544,15 @@ static void port92_class_initfn(ObjectClass *klass,
> void *data)
> {
> DeviceClass *dc = DEVICE_CLASS(klass);
>
> - dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why
> */
> dc->realize = port92_realizefn;
> dc->reset = port92_reset;
> dc->vmsd = &vmstate_port92_isa;
> + /*
> + * Reason: unlike ordinary ISA devices, this one needs additional
> + * wiring: its A20 output line needs to be wired up by
> + * port92_init().
> + */
> + dc->cannot_instantiate_with_device_add_yet = true;
> }
>
> static const TypeInfo port92_info = {
> diff --git a/hw/input/pckbd.c b/hw/input/pckbd.c
> index dee31a6..655b8c5 100644
> --- a/hw/input/pckbd.c
> +++ b/hw/input/pckbd.c
> @@ -522,7 +522,6 @@ static void i8042_class_initfn(ObjectClass *klass, void
> *data)
> DeviceClass *dc = DEVICE_CLASS(klass);
>
> dc->realize = i8042_realizefn;
> - dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why
> */
> dc->vmsd = &vmstate_kbd_isa;
> }
>
> diff --git a/hw/input/vmmouse.c b/hw/input/vmmouse.c
> index 600e4a2..6a50533 100644
> --- a/hw/input/vmmouse.c
> +++ b/hw/input/vmmouse.c
> @@ -282,10 +282,11 @@ static void vmmouse_class_initfn(ObjectClass *klass,
> void *data)
> DeviceClass *dc = DEVICE_CLASS(klass);
>
> dc->realize = vmmouse_realizefn;
> - dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why
> */
> dc->reset = vmmouse_reset;
> dc->vmsd = &vmstate_vmmouse;
> dc->props = vmmouse_properties;
> + /* Reason: pointer property "ps2_mouse" */
> + dc->cannot_instantiate_with_device_add_yet = true;
> }
>
> static const TypeInfo vmmouse_info = {
> diff --git a/hw/intc/i8259_common.c b/hw/intc/i8259_common.c
> index 2acdbfe..9d29399 100644
> --- a/hw/intc/i8259_common.c
> +++ b/hw/intc/i8259_common.c
> @@ -135,9 +135,15 @@ static void pic_common_class_init(ObjectClass *klass,
> void *data)
> DeviceClass *dc = DEVICE_CLASS(klass);
>
> dc->vmsd = &vmstate_pic_common;
> - dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why
> */
> dc->props = pic_properties_common;
> dc->realize = pic_common_realize;
> + /*
> + * Reason: unlike ordinary ISA devices, the PICs need additional
> + * wiring: its IRQ input lines are set up by board code, and the
> + * wiring of the slave to the master is hard-coded in device model
> + * code.
> + */
> + dc->cannot_instantiate_with_device_add_yet = true;
> }
>
> static const TypeInfo pic_common_type = {
> diff --git a/hw/misc/vmport.c b/hw/misc/vmport.c
> index 94ae6ae..cd5716a 100644
> --- a/hw/misc/vmport.c
> +++ b/hw/misc/vmport.c
> @@ -162,7 +162,8 @@ static void vmport_class_initfn(ObjectClass *klass, void
> *data)
> DeviceClass *dc = DEVICE_CLASS(klass);
>
> dc->realize = vmport_realizefn;
> - dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why
> */
> + /* Reason: realize sets global port_state */
> + dc->cannot_instantiate_with_device_add_yet = true;
> }
>
> static const TypeInfo vmport_info = {
> diff --git a/hw/timer/i8254_common.c b/hw/timer/i8254_common.c
> index dc2196c..9db5c9d 100644
> --- a/hw/timer/i8254_common.c
> +++ b/hw/timer/i8254_common.c
> @@ -282,7 +282,12 @@ static void pit_common_class_init(ObjectClass *klass,
> void *data)
>
> dc->realize = pit_common_realize;
> dc->vmsd = &vmstate_pit_common;
> - dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why
> */
> + /*
> + * Reason: unlike ordinary ISA devices, the PIT may need to be
> + * wired to the HPET, and because of that, some wiring is always
> + * done by board code.
> + */
> + dc->cannot_instantiate_with_device_add_yet = true;
> }
>
> static const TypeInfo pit_common_type = {
> diff --git a/hw/timer/m48t59.c b/hw/timer/m48t59.c
> index f81cf48..8005503 100644
> --- a/hw/timer/m48t59.c
> +++ b/hw/timer/m48t59.c
> @@ -750,9 +750,10 @@ static void m48t59_isa_class_init(ObjectClass *klass,
> void *data)
> DeviceClass *dc = DEVICE_CLASS(klass);
>
> dc->realize = m48t59_isa_realize;
> - dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why
> */
> dc->reset = m48t59_reset_isa;
> dc->props = m48t59_isa_properties;
> + /* Reason: needs to be wired up by m48t59_init_isa() */
> + dc->cannot_instantiate_with_device_add_yet = true;
> }
>
> static const TypeInfo m48t59_isa_info = {
> diff --git a/hw/timer/mc146818rtc.c b/hw/timer/mc146818rtc.c
> index 2f58220..17e1907 100644
> --- a/hw/timer/mc146818rtc.c
> +++ b/hw/timer/mc146818rtc.c
> @@ -906,9 +906,10 @@ static void rtc_class_initfn(ObjectClass *klass, void
> *data)
> DeviceClass *dc = DEVICE_CLASS(klass);
>
> dc->realize = rtc_realizefn;
> - dc->cannot_instantiate_with_device_add_yet = true; /* FIXME explain why
> */
> dc->vmsd = &vmstate_rtc;
> dc->props = mc146818rtc_properties;
> + /* Reason: needs to be wired up by rtc_init() */
> + dc->cannot_instantiate_with_device_add_yet = true;
> }
>
> static const TypeInfo mc146818rtc_info = {
- [Qemu-devel] [PATCH v3 00/10] Clean up and fix no_user, armbru, 2013/10/30
- [Qemu-devel] [PATCH v3 02/10] sysbus: Set cannot_instantiate_with_device_add_yet, armbru, 2013/10/30
- [Qemu-devel] [PATCH v3 04/10] apic: Document why cannot_instantiate_with_device_add_yet, armbru, 2013/10/30
- [Qemu-devel] [PATCH v3 03/10] cpu: Document why cannot_instantiate_with_device_add_yet, armbru, 2013/10/30
- [Qemu-devel] [PATCH v3 06/10] ich9: Document why cannot_instantiate_with_device_add_yet, armbru, 2013/10/30
- [Qemu-devel] [PATCH v3 08/10] vt82c686: Clean up use of cannot_instantiate_with_device_add_yet, armbru, 2013/10/30
- [Qemu-devel] [PATCH v3 01/10] qdev: Replace no_user by cannot_instantiate_with_device_add_yet, armbru, 2013/10/30
- [Qemu-devel] [PATCH v3 09/10] isa: Clean up use of cannot_instantiate_with_device_add_yet, armbru, 2013/10/30
- Re: [Qemu-devel] [PATCH v3 09/10] isa: Clean up use of cannot_instantiate_with_device_add_yet,
Marcel Apfelbaum <=
- [Qemu-devel] [PATCH v3 05/10] pci-host: Consistently set cannot_instantiate_with_device_add_yet, armbru, 2013/10/30
- [Qemu-devel] [PATCH v3 07/10] piix3 piix4: Clean up use of cannot_instantiate_with_device_add_yet, armbru, 2013/10/30
- [Qemu-devel] [PATCH v3 10/10] qdev: Do not let the user try to device_add when it cannot work, armbru, 2013/10/30