dma/i82374: avoid double creation of i82374 device
diff mbox

Message ID 20180326111857.26146-1-otubo@redhat.com
State New
Headers show

Commit Message

Eduardo Otubo March 26, 2018, 11:18 a.m. UTC
QEMU fails when used with the following command line:

    ./ppc64-softmmu/qemu-system-ppc64 -S -machine 40p,accel=tcg -device i82374
    qemu-system-ppc64: hw/isa/isa-bus.c:110: isa_bus_dma: Assertion `!bus->dma[0] && !bus->dma[1]' failed.
    Aborted (core dumped)

The 40p machine type already creates the device i82374. If specified in the
command line, it will try to create it again, hence generating the error. The
function isa_bus_dma() isn't supposed to be called twice for the same bus. This
patch fixes this issue by calling involved functions with Error **error_fatal
and propagating back the error so QEMU can fail nicely without Abort and core
dump.

Signed-off-by: Eduardo Otubo <otubo@redhat.com>
---
v4:
 * Change return value from int8_t to int
 * Changed function calling for other architectures.

v3:
 * Removed all unecessary local_err                                                                                                                                                                                  
 * Change return of isa_bus_dma() and DMA_init() from void to int8_t,                                                                                                                                                
   returning -EBUSY on error and 0 on success                                                                                                                                                                        
 * Added qdev_cleanup_nofail() in case isa_bus_dma() returns error. The                                                                                                                                              
   cleanup looks safe, but please review if I didn't miss any detail                                                                                                                                                 
                                                                                                                                                                                                                     
v2:                                                                                                                                                                                                                  
 * Removed user_creatable=false and replaced by error handling using                                                                                                                                                 
   Error **errp and error_propagate();          

 hw/core/qdev.c          | 16 ++++++++++++++++
 hw/dma/i82374.c         |  3 ++-
 hw/dma/i8257.c          | 35 +++++++++++++++++++----------------
 hw/i386/pc.c            |  2 +-
 hw/isa/isa-bus.c        |  8 ++++++--
 hw/mips/mips_fulong2e.c |  2 +-
 hw/mips/mips_jazz.c     |  2 +-
 hw/mips/mips_malta.c    |  2 +-
 include/hw/dma/i8257.h  |  2 +-
 include/hw/isa/isa.h    |  2 +-
 include/hw/qdev-core.h  |  1 +
 11 files changed, 50 insertions(+), 25 deletions(-)

Comments

Thomas Huth March 26, 2018, 12:14 p.m. UTC | #1
On 26.03.2018 13:18, Eduardo Otubo wrote:
> QEMU fails when used with the following command line:
> 
>     ./ppc64-softmmu/qemu-system-ppc64 -S -machine 40p,accel=tcg -device i82374
>     qemu-system-ppc64: hw/isa/isa-bus.c:110: isa_bus_dma: Assertion `!bus->dma[0] && !bus->dma[1]' failed.
>     Aborted (core dumped)
> 
> The 40p machine type already creates the device i82374. If specified in the
> command line, it will try to create it again, hence generating the error. The
> function isa_bus_dma() isn't supposed to be called twice for the same bus. This
> patch fixes this issue by calling involved functions with Error **error_fatal
> and propagating back the error so QEMU can fail nicely without Abort and core
> dump.
> 
> Signed-off-by: Eduardo Otubo <otubo@redhat.com>
> ---
> v4:
>  * Change return value from int8_t to int
>  * Changed function calling for other architectures.
> 
> v3:
>  * Removed all unecessary local_err                                                                                                                                                                                  
>  * Change return of isa_bus_dma() and DMA_init() from void to int8_t,                                                                                                                                                
>    returning -EBUSY on error and 0 on success                                                                                                                                                                        
>  * Added qdev_cleanup_nofail() in case isa_bus_dma() returns error. The                                                                                                                                              
>    cleanup looks safe, but please review if I didn't miss any detail                                                                                                                                                 
>                                                                                                                                                                                                                      
> v2:                                                                                                                                                                                                                  
>  * Removed user_creatable=false and replaced by error handling using                                                                                                                                                 
>    Error **errp and error_propagate();          
> 
>  hw/core/qdev.c          | 16 ++++++++++++++++
>  hw/dma/i82374.c         |  3 ++-
>  hw/dma/i8257.c          | 35 +++++++++++++++++++----------------
>  hw/i386/pc.c            |  2 +-
>  hw/isa/isa-bus.c        |  8 ++++++--
>  hw/mips/mips_fulong2e.c |  2 +-
>  hw/mips/mips_jazz.c     |  2 +-
>  hw/mips/mips_malta.c    |  2 +-
>  include/hw/dma/i8257.h  |  2 +-
>  include/hw/isa/isa.h    |  2 +-
>  include/hw/qdev-core.h  |  1 +
>  11 files changed, 50 insertions(+), 25 deletions(-)
> 
> diff --git a/hw/core/qdev.c b/hw/core/qdev.c
> index f6f92473b8..e14164526f 100644
> --- a/hw/core/qdev.c
> +++ b/hw/core/qdev.c
> @@ -345,6 +345,22 @@ void qdev_init_nofail(DeviceState *dev)
>      object_unref(OBJECT(dev));
>  }
>  
> +void qdev_cleanup_nofail(DeviceState *dev)
> +{
> +    Error *err = NULL;
> +
> +    assert(dev->realized);
> +
> +    object_ref(OBJECT(dev));
> +    object_property_set_bool(OBJECT(dev), false, "realized", &err);
> +    if (err) {
> +        error_reportf_err(err, "Clean up of device %s failed: ",
> +                          object_get_typename(OBJECT(dev)));
> +        exit(1);
> +    }
> +    object_unref(OBJECT(dev));
> +}

I'm not a qdev expert, but I wonder whether we need the full object_ref
+ unref dance here? If not, you could get rid of this function and
simply do the object_property_set_bool(OBJECT(dev), false, "realized",
&error_fatal) twice in i8257_dma_init() instead.

>  void qdev_machine_creation_done(void)
>  {
>      /*
> diff --git a/hw/dma/i82374.c b/hw/dma/i82374.c
> index 83c87d92e0..718cd632fd 100644
> --- a/hw/dma/i82374.c
> +++ b/hw/dma/i82374.c
> @@ -25,6 +25,7 @@
>  #include "qemu/osdep.h"
>  #include "hw/isa/isa.h"
>  #include "hw/dma/i8257.h"
> +#include "qapi/error.h"
>  
>  #define TYPE_I82374 "i82374"
>  #define I82374(obj) OBJECT_CHECK(I82374State, (obj), TYPE_I82374)
> @@ -124,7 +125,7 @@ static void i82374_realize(DeviceState *dev, Error **errp)
>      portio_list_add(&s->port_list, isa_address_space_io(&s->parent_obj),
>                      s->iobase);
>  
> -    i8257_dma_init(isa_bus_from_device(ISA_DEVICE(dev)), true);
> +    i8257_dma_init(isa_bus_from_device(ISA_DEVICE(dev)), true, errp);

I think it would be better to move this at the beginning of the
i82374_realize function and return in case of errors, so that the
portio_list_init() is not called in such a case:

    Error *local_err = NULL;

    i8257_dma_init(isa_bus_from_device(ISA_DEVICE(dev)), true, local_err);
    if (local_err) {
        error_propagate(errp, local_err);
        return;
    }

    portio_list_init(...);
    ...

>      memset(s->commands, 0, sizeof(s->commands));
>  }
>  
> diff --git a/hw/dma/i8257.c b/hw/dma/i8257.c
> index 52675e97c9..84978f9459 100644
> --- a/hw/dma/i8257.c
> +++ b/hw/dma/i8257.c
> @@ -622,26 +622,29 @@ static void i8257_register_types(void)
>  
>  type_init(i8257_register_types)
>  
> -void i8257_dma_init(ISABus *bus, bool high_page_enable)
> +void i8257_dma_init(ISABus *bus, bool high_page_enable, Error **error_fatal)

Please don't call this parameter "error_fatal" since this shadows the
global error_fatal variable and thus is very confusing. Use "errp" like
everywhere else instead.

>  {
>      ISADevice *isa1, *isa2;
> -    DeviceState *d;
> +    DeviceState *d1, *d2;
>  
>      isa1 = isa_create(bus, TYPE_I8257);
> -    d = DEVICE(isa1);
> -    qdev_prop_set_int32(d, "base", 0x00);
> -    qdev_prop_set_int32(d, "page-base", 0x80);
> -    qdev_prop_set_int32(d, "pageh-base", high_page_enable ? 0x480 : -1);
> -    qdev_prop_set_int32(d, "dshift", 0);
> -    qdev_init_nofail(d);
> +    d1 = DEVICE(isa1);
> +    qdev_prop_set_int32(d1, "base", 0x00);
> +    qdev_prop_set_int32(d1, "page-base", 0x80);
> +    qdev_prop_set_int32(d1, "pageh-base", high_page_enable ? 0x480 : -1);
> +    qdev_prop_set_int32(d1, "dshift", 0);
> +    qdev_init_nofail(d1);
>  
>      isa2 = isa_create(bus, TYPE_I8257);
> -    d = DEVICE(isa2);
> -    qdev_prop_set_int32(d, "base", 0xc0);
> -    qdev_prop_set_int32(d, "page-base", 0x88);
> -    qdev_prop_set_int32(d, "pageh-base", high_page_enable ? 0x488 : -1);
> -    qdev_prop_set_int32(d, "dshift", 1);
> -    qdev_init_nofail(d);
> -
> -    isa_bus_dma(bus, ISADMA(isa1), ISADMA(isa2));
> +    d2 = DEVICE(isa2);
> +    qdev_prop_set_int32(d2, "base", 0xc0);
> +    qdev_prop_set_int32(d2, "page-base", 0x88);
> +    qdev_prop_set_int32(d2, "pageh-base", high_page_enable ? 0x488 : -1);
> +    qdev_prop_set_int32(d2, "dshift", 1);
> +    qdev_init_nofail(d2);
> +
> +    if (isa_bus_dma(bus, ISADMA(isa1), ISADMA(isa2), error_fatal) < 0) {

s/error_fatal/errp/

> +        qdev_cleanup_nofail(d1);
> +        qdev_cleanup_nofail(d2);
> +    }
>  }
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index d36bac8c89..31777a7ed5 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -1624,7 +1624,7 @@ void pc_basic_device_init(ISABus *isa_bus, qemu_irq *gsi,
>          pcspk_init(isa_bus, pit);
>      }
>  
> -    i8257_dma_init(isa_bus, 0);
> +    i8257_dma_init(isa_bus, 0, &error_fatal);
>  
>      /* Super I/O */
>      pc_superio_init(isa_bus, create_fdctrl, no_vmport);
> diff --git a/hw/isa/isa-bus.c b/hw/isa/isa-bus.c
> index 63fa77effc..f0f9a1f8e0 100644
> --- a/hw/isa/isa-bus.c
> +++ b/hw/isa/isa-bus.c
> @@ -104,12 +104,16 @@ void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, int isairq)
>      qdev_connect_gpio_out(DEVICE(isadev), gpioirq, irq);
>  }
>  
> -void isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16)
> +int isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16, Error **error_fatal)

s/error_fatal/errp/

>  {
>      assert(bus && dma8 && dma16);
> -    assert(!bus->dma[0] && !bus->dma[1]);
> +    if (bus->dma[0] || bus->dma[1]) {
> +        error_setg(error_fatal, "DMA already initialized on ISA bus");

s/error_fatal/errp/

> +        return -EBUSY;
> +    }
>      bus->dma[0] = dma8;
>      bus->dma[1] = dma16;
> +    return 0;
>  }
>  
>  IsaDma *isa_get_dma(ISABus *bus, int nchan)
> diff --git a/hw/mips/mips_fulong2e.c b/hw/mips/mips_fulong2e.c
> index 02fb2fdcc4..e98d994f3a 100644
> --- a/hw/mips/mips_fulong2e.c
> +++ b/hw/mips/mips_fulong2e.c
> @@ -243,7 +243,7 @@ static void vt82c686b_southbridge_init(PCIBus *pci_bus, int slot, qemu_irq intc,
>      isa_bus_irqs(isa_bus, i8259);
>      /* init other devices */
>      i8254_pit_init(isa_bus, 0x40, 0, NULL);
> -    i8257_dma_init(isa_bus, 0);
> +    i8257_dma_init(isa_bus, 0, &error_fatal);
>      /* Super I/O */
>      isa_create_simple(isa_bus, TYPE_VT82C686B_SUPERIO);
>  
> diff --git a/hw/mips/mips_jazz.c b/hw/mips/mips_jazz.c
> index 7223085547..a1c071e311 100644
> --- a/hw/mips/mips_jazz.c
> +++ b/hw/mips/mips_jazz.c
> @@ -222,7 +222,7 @@ static void mips_jazz_init(MachineState *machine,
>      /* ISA devices */
>      i8259 = i8259_init(isa_bus, env->irq[4]);
>      isa_bus_irqs(isa_bus, i8259);
> -    i8257_dma_init(isa_bus, 0);
> +    i8257_dma_init(isa_bus, 0, &error_fatal);
>      pit = i8254_pit_init(isa_bus, 0x40, 0, NULL);
>      pcspk_init(isa_bus, pit);
>  
> diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
> index f6513a4fd5..7bb9b6071d 100644
> --- a/hw/mips/mips_malta.c
> +++ b/hw/mips/mips_malta.c
> @@ -1198,7 +1198,7 @@ void mips_malta_init(MachineState *machine)
>      smbus = piix4_pm_init(pci_bus, piix4_devfn + 3, 0x1100,
>                            isa_get_irq(NULL, 9), NULL, 0, NULL);
>      pit = i8254_pit_init(isa_bus, 0x40, 0, NULL);
> -    i8257_dma_init(isa_bus, 0);
> +    i8257_dma_init(isa_bus, 0, &error_fatal);
>      mc146818_rtc_init(isa_bus, 2000, NULL);
>  
>      /* generate SPD EEPROM data */
> diff --git a/include/hw/dma/i8257.h b/include/hw/dma/i8257.h
> index 2cab50bb6c..d3f89393fe 100644
> --- a/include/hw/dma/i8257.h
> +++ b/include/hw/dma/i8257.h
> @@ -44,6 +44,6 @@ typedef struct I8257State {
>      PortioList portio_pageh;
>  } I8257State;
>  
> -void i8257_dma_init(ISABus *bus, bool high_page_enable);
> +void i8257_dma_init(ISABus *bus, bool high_page_enable, Error **error_fatal);

s/error_fatal/errp/

>  #endif
> diff --git a/include/hw/isa/isa.h b/include/hw/isa/isa.h
> index b9dbab24b4..eb89654d24 100644
> --- a/include/hw/isa/isa.h
> +++ b/include/hw/isa/isa.h
> @@ -103,7 +103,7 @@ void isa_bus_irqs(ISABus *bus, qemu_irq *irqs);
>  qemu_irq isa_get_irq(ISADevice *dev, int isairq);
>  void isa_init_irq(ISADevice *dev, qemu_irq *p, int isairq);
>  void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, int isairq);
> -void isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16);
> +int isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16, Error ** error_fatal);

s/error_fatal/errp/

>  IsaDma *isa_get_dma(ISABus *bus, int nchan);
>  MemoryRegion *isa_address_space(ISADevice *dev);
>  MemoryRegion *isa_address_space_io(ISADevice *dev);
> diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
> index 9453588160..238ad2f6f3 100644
> --- a/include/hw/qdev-core.h
> +++ b/include/hw/qdev-core.h
> @@ -283,6 +283,7 @@ typedef struct GlobalProperty {
>  DeviceState *qdev_create(BusState *bus, const char *name);
>  DeviceState *qdev_try_create(BusState *bus, const char *name);
>  void qdev_init_nofail(DeviceState *dev);
> +void qdev_cleanup_nofail(DeviceState *dev);
>  void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
>                                   int required_for_version);
>  HotplugHandler *qdev_get_machine_hotplug_handler(DeviceState *dev);
> 

 Thomas
Paolo Bonzini March 26, 2018, 12:16 p.m. UTC | #2
On 26/03/2018 14:14, Thomas Huth wrote:
>> +    object_ref(OBJECT(dev));
>> +    object_property_set_bool(OBJECT(dev), false, "realized", &err);
>> +    if (err) {
>> +        error_reportf_err(err, "Clean up of device %s failed: ",
>> +                          object_get_typename(OBJECT(dev)));
>> +        exit(1);
>> +    }
>> +    object_unref(OBJECT(dev));
>> +}
> 
> I'm not a qdev expert, but I wonder whether we need the full object_ref
> + unref dance here? If not, you could get rid of this function and
> simply do the object_property_set_bool(OBJECT(dev), false, "realized",
> &error_fatal) twice in i8257_dma_init() instead.

No, however we do need an object_unparent call.

Paolo
Philippe Mathieu-Daudé March 26, 2018, 3:20 p.m. UTC | #3
Hi Eduardo,

On 03/26/2018 08:18 AM, Eduardo Otubo wrote:
> QEMU fails when used with the following command line:
> 
>     ./ppc64-softmmu/qemu-system-ppc64 -S -machine 40p,accel=tcg -device i82374
>     qemu-system-ppc64: hw/isa/isa-bus.c:110: isa_bus_dma: Assertion `!bus->dma[0] && !bus->dma[1]' failed.
>     Aborted (core dumped)
> 
> The 40p machine type already creates the device i82374. If specified in the
> command line, it will try to create it again, hence generating the error. The
> function isa_bus_dma() isn't supposed to be called twice for the same bus. This
> patch fixes this issue by calling involved functions with Error **error_fatal
> and propagating back the error so QEMU can fail nicely without Abort and core
> dump.

I came with a simpler patch (imho), keeping your comment.

> 
> Signed-off-by: Eduardo Otubo <otubo@redhat.com>
> ---
> v4:
>  * Change return value from int8_t to int
>  * Changed function calling for other architectures.
> 
> v3:
>  * Removed all unecessary local_err                                                                                                                                                                                  
>  * Change return of isa_bus_dma() and DMA_init() from void to int8_t,                                                                                                                                                
>    returning -EBUSY on error and 0 on success                                                                                                                                                                        
>  * Added qdev_cleanup_nofail() in case isa_bus_dma() returns error. The                                                                                                                                              
>    cleanup looks safe, but please review if I didn't miss any detail                                                                                                                                                 
>                                                                                                                                                                                                                      
> v2:                                                                                                                                                                                                                  
>  * Removed user_creatable=false and replaced by error handling using                                                                                                                                                 
>    Error **errp and error_propagate();          
> 
>  hw/core/qdev.c          | 16 ++++++++++++++++
>  hw/dma/i82374.c         |  3 ++-
>  hw/dma/i8257.c          | 35 +++++++++++++++++++----------------
>  hw/i386/pc.c            |  2 +-
>  hw/isa/isa-bus.c        |  8 ++++++--
>  hw/mips/mips_fulong2e.c |  2 +-
>  hw/mips/mips_jazz.c     |  2 +-
>  hw/mips/mips_malta.c    |  2 +-
>  include/hw/dma/i8257.h  |  2 +-
>  include/hw/isa/isa.h    |  2 +-
>  include/hw/qdev-core.h  |  1 +
>  11 files changed, 50 insertions(+), 25 deletions(-)
> 
> diff --git a/hw/core/qdev.c b/hw/core/qdev.c
> index f6f92473b8..e14164526f 100644
> --- a/hw/core/qdev.c
> +++ b/hw/core/qdev.c
> @@ -345,6 +345,22 @@ void qdev_init_nofail(DeviceState *dev)
>      object_unref(OBJECT(dev));
>  }
>  
> +void qdev_cleanup_nofail(DeviceState *dev)
> +{
> +    Error *err = NULL;
> +
> +    assert(dev->realized);
> +
> +    object_ref(OBJECT(dev));
> +    object_property_set_bool(OBJECT(dev), false, "realized", &err);
> +    if (err) {
> +        error_reportf_err(err, "Clean up of device %s failed: ",
> +                          object_get_typename(OBJECT(dev)));
> +        exit(1);
> +    }
> +    object_unref(OBJECT(dev));
> +}
> +
>  void qdev_machine_creation_done(void)
>  {
>      /*
> diff --git a/hw/dma/i82374.c b/hw/dma/i82374.c
> index 83c87d92e0..718cd632fd 100644
> --- a/hw/dma/i82374.c
> +++ b/hw/dma/i82374.c
> @@ -25,6 +25,7 @@
>  #include "qemu/osdep.h"
>  #include "hw/isa/isa.h"
>  #include "hw/dma/i8257.h"
> +#include "qapi/error.h"
>  
>  #define TYPE_I82374 "i82374"
>  #define I82374(obj) OBJECT_CHECK(I82374State, (obj), TYPE_I82374)
> @@ -124,7 +125,7 @@ static void i82374_realize(DeviceState *dev, Error **errp)
>      portio_list_add(&s->port_list, isa_address_space_io(&s->parent_obj),
>                      s->iobase);
>  
> -    i8257_dma_init(isa_bus_from_device(ISA_DEVICE(dev)), true);
> +    i8257_dma_init(isa_bus_from_device(ISA_DEVICE(dev)), true, errp);
>      memset(s->commands, 0, sizeof(s->commands));
>  }
>  
> diff --git a/hw/dma/i8257.c b/hw/dma/i8257.c
> index 52675e97c9..84978f9459 100644
> --- a/hw/dma/i8257.c
> +++ b/hw/dma/i8257.c
> @@ -622,26 +622,29 @@ static void i8257_register_types(void)
>  
>  type_init(i8257_register_types)
>  
> -void i8257_dma_init(ISABus *bus, bool high_page_enable)
> +void i8257_dma_init(ISABus *bus, bool high_page_enable, Error **error_fatal)
>  {
>      ISADevice *isa1, *isa2;
> -    DeviceState *d;
> +    DeviceState *d1, *d2;
>  
>      isa1 = isa_create(bus, TYPE_I8257);
> -    d = DEVICE(isa1);
> -    qdev_prop_set_int32(d, "base", 0x00);
> -    qdev_prop_set_int32(d, "page-base", 0x80);
> -    qdev_prop_set_int32(d, "pageh-base", high_page_enable ? 0x480 : -1);
> -    qdev_prop_set_int32(d, "dshift", 0);
> -    qdev_init_nofail(d);
> +    d1 = DEVICE(isa1);
> +    qdev_prop_set_int32(d1, "base", 0x00);
> +    qdev_prop_set_int32(d1, "page-base", 0x80);
> +    qdev_prop_set_int32(d1, "pageh-base", high_page_enable ? 0x480 : -1);
> +    qdev_prop_set_int32(d1, "dshift", 0);
> +    qdev_init_nofail(d1);
>  
>      isa2 = isa_create(bus, TYPE_I8257);
> -    d = DEVICE(isa2);
> -    qdev_prop_set_int32(d, "base", 0xc0);
> -    qdev_prop_set_int32(d, "page-base", 0x88);
> -    qdev_prop_set_int32(d, "pageh-base", high_page_enable ? 0x488 : -1);
> -    qdev_prop_set_int32(d, "dshift", 1);
> -    qdev_init_nofail(d);
> -
> -    isa_bus_dma(bus, ISADMA(isa1), ISADMA(isa2));
> +    d2 = DEVICE(isa2);
> +    qdev_prop_set_int32(d2, "base", 0xc0);
> +    qdev_prop_set_int32(d2, "page-base", 0x88);
> +    qdev_prop_set_int32(d2, "pageh-base", high_page_enable ? 0x488 : -1);
> +    qdev_prop_set_int32(d2, "dshift", 1);
> +    qdev_init_nofail(d2);
> +
> +    if (isa_bus_dma(bus, ISADMA(isa1), ISADMA(isa2), error_fatal) < 0) {
> +        qdev_cleanup_nofail(d1);
> +        qdev_cleanup_nofail(d2);
> +    }
>  }
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index d36bac8c89..31777a7ed5 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -1624,7 +1624,7 @@ void pc_basic_device_init(ISABus *isa_bus, qemu_irq *gsi,
>          pcspk_init(isa_bus, pit);
>      }
>  
> -    i8257_dma_init(isa_bus, 0);
> +    i8257_dma_init(isa_bus, 0, &error_fatal);
>  
>      /* Super I/O */
>      pc_superio_init(isa_bus, create_fdctrl, no_vmport);
> diff --git a/hw/isa/isa-bus.c b/hw/isa/isa-bus.c
> index 63fa77effc..f0f9a1f8e0 100644
> --- a/hw/isa/isa-bus.c
> +++ b/hw/isa/isa-bus.c
> @@ -104,12 +104,16 @@ void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, int isairq)
>      qdev_connect_gpio_out(DEVICE(isadev), gpioirq, irq);
>  }
>  
> -void isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16)
> +int isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16, Error **error_fatal)
>  {
>      assert(bus && dma8 && dma16);
> -    assert(!bus->dma[0] && !bus->dma[1]);
> +    if (bus->dma[0] || bus->dma[1]) {
> +        error_setg(error_fatal, "DMA already initialized on ISA bus");
> +        return -EBUSY;
> +    }
>      bus->dma[0] = dma8;
>      bus->dma[1] = dma16;
> +    return 0;
>  }
>  
>  IsaDma *isa_get_dma(ISABus *bus, int nchan)
> diff --git a/hw/mips/mips_fulong2e.c b/hw/mips/mips_fulong2e.c
> index 02fb2fdcc4..e98d994f3a 100644
> --- a/hw/mips/mips_fulong2e.c
> +++ b/hw/mips/mips_fulong2e.c
> @@ -243,7 +243,7 @@ static void vt82c686b_southbridge_init(PCIBus *pci_bus, int slot, qemu_irq intc,
>      isa_bus_irqs(isa_bus, i8259);
>      /* init other devices */
>      i8254_pit_init(isa_bus, 0x40, 0, NULL);
> -    i8257_dma_init(isa_bus, 0);
> +    i8257_dma_init(isa_bus, 0, &error_fatal);
>      /* Super I/O */
>      isa_create_simple(isa_bus, TYPE_VT82C686B_SUPERIO);
>  
> diff --git a/hw/mips/mips_jazz.c b/hw/mips/mips_jazz.c
> index 7223085547..a1c071e311 100644
> --- a/hw/mips/mips_jazz.c
> +++ b/hw/mips/mips_jazz.c
> @@ -222,7 +222,7 @@ static void mips_jazz_init(MachineState *machine,
>      /* ISA devices */
>      i8259 = i8259_init(isa_bus, env->irq[4]);
>      isa_bus_irqs(isa_bus, i8259);
> -    i8257_dma_init(isa_bus, 0);
> +    i8257_dma_init(isa_bus, 0, &error_fatal);
>      pit = i8254_pit_init(isa_bus, 0x40, 0, NULL);
>      pcspk_init(isa_bus, pit);
>  
> diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
> index f6513a4fd5..7bb9b6071d 100644
> --- a/hw/mips/mips_malta.c
> +++ b/hw/mips/mips_malta.c
> @@ -1198,7 +1198,7 @@ void mips_malta_init(MachineState *machine)
>      smbus = piix4_pm_init(pci_bus, piix4_devfn + 3, 0x1100,
>                            isa_get_irq(NULL, 9), NULL, 0, NULL);
>      pit = i8254_pit_init(isa_bus, 0x40, 0, NULL);
> -    i8257_dma_init(isa_bus, 0);
> +    i8257_dma_init(isa_bus, 0, &error_fatal);
>      mc146818_rtc_init(isa_bus, 2000, NULL);
>  
>      /* generate SPD EEPROM data */
> diff --git a/include/hw/dma/i8257.h b/include/hw/dma/i8257.h
> index 2cab50bb6c..d3f89393fe 100644
> --- a/include/hw/dma/i8257.h
> +++ b/include/hw/dma/i8257.h
> @@ -44,6 +44,6 @@ typedef struct I8257State {
>      PortioList portio_pageh;
>  } I8257State;
>  
> -void i8257_dma_init(ISABus *bus, bool high_page_enable);
> +void i8257_dma_init(ISABus *bus, bool high_page_enable, Error **error_fatal);
>  
>  #endif
> diff --git a/include/hw/isa/isa.h b/include/hw/isa/isa.h
> index b9dbab24b4..eb89654d24 100644
> --- a/include/hw/isa/isa.h
> +++ b/include/hw/isa/isa.h
> @@ -103,7 +103,7 @@ void isa_bus_irqs(ISABus *bus, qemu_irq *irqs);
>  qemu_irq isa_get_irq(ISADevice *dev, int isairq);
>  void isa_init_irq(ISADevice *dev, qemu_irq *p, int isairq);
>  void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, int isairq);
> -void isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16);
> +int isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16, Error ** error_fatal);
>  IsaDma *isa_get_dma(ISABus *bus, int nchan);
>  MemoryRegion *isa_address_space(ISADevice *dev);
>  MemoryRegion *isa_address_space_io(ISADevice *dev);
> diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
> index 9453588160..238ad2f6f3 100644
> --- a/include/hw/qdev-core.h
> +++ b/include/hw/qdev-core.h
> @@ -283,6 +283,7 @@ typedef struct GlobalProperty {
>  DeviceState *qdev_create(BusState *bus, const char *name);
>  DeviceState *qdev_try_create(BusState *bus, const char *name);
>  void qdev_init_nofail(DeviceState *dev);
> +void qdev_cleanup_nofail(DeviceState *dev);
>  void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
>                                   int required_for_version);
>  HotplugHandler *qdev_get_machine_hotplug_handler(DeviceState *dev);
>

Patch
diff mbox

diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index f6f92473b8..e14164526f 100644
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -345,6 +345,22 @@  void qdev_init_nofail(DeviceState *dev)
     object_unref(OBJECT(dev));
 }
 
+void qdev_cleanup_nofail(DeviceState *dev)
+{
+    Error *err = NULL;
+
+    assert(dev->realized);
+
+    object_ref(OBJECT(dev));
+    object_property_set_bool(OBJECT(dev), false, "realized", &err);
+    if (err) {
+        error_reportf_err(err, "Clean up of device %s failed: ",
+                          object_get_typename(OBJECT(dev)));
+        exit(1);
+    }
+    object_unref(OBJECT(dev));
+}
+
 void qdev_machine_creation_done(void)
 {
     /*
diff --git a/hw/dma/i82374.c b/hw/dma/i82374.c
index 83c87d92e0..718cd632fd 100644
--- a/hw/dma/i82374.c
+++ b/hw/dma/i82374.c
@@ -25,6 +25,7 @@ 
 #include "qemu/osdep.h"
 #include "hw/isa/isa.h"
 #include "hw/dma/i8257.h"
+#include "qapi/error.h"
 
 #define TYPE_I82374 "i82374"
 #define I82374(obj) OBJECT_CHECK(I82374State, (obj), TYPE_I82374)
@@ -124,7 +125,7 @@  static void i82374_realize(DeviceState *dev, Error **errp)
     portio_list_add(&s->port_list, isa_address_space_io(&s->parent_obj),
                     s->iobase);
 
-    i8257_dma_init(isa_bus_from_device(ISA_DEVICE(dev)), true);
+    i8257_dma_init(isa_bus_from_device(ISA_DEVICE(dev)), true, errp);
     memset(s->commands, 0, sizeof(s->commands));
 }
 
diff --git a/hw/dma/i8257.c b/hw/dma/i8257.c
index 52675e97c9..84978f9459 100644
--- a/hw/dma/i8257.c
+++ b/hw/dma/i8257.c
@@ -622,26 +622,29 @@  static void i8257_register_types(void)
 
 type_init(i8257_register_types)
 
-void i8257_dma_init(ISABus *bus, bool high_page_enable)
+void i8257_dma_init(ISABus *bus, bool high_page_enable, Error **error_fatal)
 {
     ISADevice *isa1, *isa2;
-    DeviceState *d;
+    DeviceState *d1, *d2;
 
     isa1 = isa_create(bus, TYPE_I8257);
-    d = DEVICE(isa1);
-    qdev_prop_set_int32(d, "base", 0x00);
-    qdev_prop_set_int32(d, "page-base", 0x80);
-    qdev_prop_set_int32(d, "pageh-base", high_page_enable ? 0x480 : -1);
-    qdev_prop_set_int32(d, "dshift", 0);
-    qdev_init_nofail(d);
+    d1 = DEVICE(isa1);
+    qdev_prop_set_int32(d1, "base", 0x00);
+    qdev_prop_set_int32(d1, "page-base", 0x80);
+    qdev_prop_set_int32(d1, "pageh-base", high_page_enable ? 0x480 : -1);
+    qdev_prop_set_int32(d1, "dshift", 0);
+    qdev_init_nofail(d1);
 
     isa2 = isa_create(bus, TYPE_I8257);
-    d = DEVICE(isa2);
-    qdev_prop_set_int32(d, "base", 0xc0);
-    qdev_prop_set_int32(d, "page-base", 0x88);
-    qdev_prop_set_int32(d, "pageh-base", high_page_enable ? 0x488 : -1);
-    qdev_prop_set_int32(d, "dshift", 1);
-    qdev_init_nofail(d);
-
-    isa_bus_dma(bus, ISADMA(isa1), ISADMA(isa2));
+    d2 = DEVICE(isa2);
+    qdev_prop_set_int32(d2, "base", 0xc0);
+    qdev_prop_set_int32(d2, "page-base", 0x88);
+    qdev_prop_set_int32(d2, "pageh-base", high_page_enable ? 0x488 : -1);
+    qdev_prop_set_int32(d2, "dshift", 1);
+    qdev_init_nofail(d2);
+
+    if (isa_bus_dma(bus, ISADMA(isa1), ISADMA(isa2), error_fatal) < 0) {
+        qdev_cleanup_nofail(d1);
+        qdev_cleanup_nofail(d2);
+    }
 }
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index d36bac8c89..31777a7ed5 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1624,7 +1624,7 @@  void pc_basic_device_init(ISABus *isa_bus, qemu_irq *gsi,
         pcspk_init(isa_bus, pit);
     }
 
-    i8257_dma_init(isa_bus, 0);
+    i8257_dma_init(isa_bus, 0, &error_fatal);
 
     /* Super I/O */
     pc_superio_init(isa_bus, create_fdctrl, no_vmport);
diff --git a/hw/isa/isa-bus.c b/hw/isa/isa-bus.c
index 63fa77effc..f0f9a1f8e0 100644
--- a/hw/isa/isa-bus.c
+++ b/hw/isa/isa-bus.c
@@ -104,12 +104,16 @@  void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, int isairq)
     qdev_connect_gpio_out(DEVICE(isadev), gpioirq, irq);
 }
 
-void isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16)
+int isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16, Error **error_fatal)
 {
     assert(bus && dma8 && dma16);
-    assert(!bus->dma[0] && !bus->dma[1]);
+    if (bus->dma[0] || bus->dma[1]) {
+        error_setg(error_fatal, "DMA already initialized on ISA bus");
+        return -EBUSY;
+    }
     bus->dma[0] = dma8;
     bus->dma[1] = dma16;
+    return 0;
 }
 
 IsaDma *isa_get_dma(ISABus *bus, int nchan)
diff --git a/hw/mips/mips_fulong2e.c b/hw/mips/mips_fulong2e.c
index 02fb2fdcc4..e98d994f3a 100644
--- a/hw/mips/mips_fulong2e.c
+++ b/hw/mips/mips_fulong2e.c
@@ -243,7 +243,7 @@  static void vt82c686b_southbridge_init(PCIBus *pci_bus, int slot, qemu_irq intc,
     isa_bus_irqs(isa_bus, i8259);
     /* init other devices */
     i8254_pit_init(isa_bus, 0x40, 0, NULL);
-    i8257_dma_init(isa_bus, 0);
+    i8257_dma_init(isa_bus, 0, &error_fatal);
     /* Super I/O */
     isa_create_simple(isa_bus, TYPE_VT82C686B_SUPERIO);
 
diff --git a/hw/mips/mips_jazz.c b/hw/mips/mips_jazz.c
index 7223085547..a1c071e311 100644
--- a/hw/mips/mips_jazz.c
+++ b/hw/mips/mips_jazz.c
@@ -222,7 +222,7 @@  static void mips_jazz_init(MachineState *machine,
     /* ISA devices */
     i8259 = i8259_init(isa_bus, env->irq[4]);
     isa_bus_irqs(isa_bus, i8259);
-    i8257_dma_init(isa_bus, 0);
+    i8257_dma_init(isa_bus, 0, &error_fatal);
     pit = i8254_pit_init(isa_bus, 0x40, 0, NULL);
     pcspk_init(isa_bus, pit);
 
diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
index f6513a4fd5..7bb9b6071d 100644
--- a/hw/mips/mips_malta.c
+++ b/hw/mips/mips_malta.c
@@ -1198,7 +1198,7 @@  void mips_malta_init(MachineState *machine)
     smbus = piix4_pm_init(pci_bus, piix4_devfn + 3, 0x1100,
                           isa_get_irq(NULL, 9), NULL, 0, NULL);
     pit = i8254_pit_init(isa_bus, 0x40, 0, NULL);
-    i8257_dma_init(isa_bus, 0);
+    i8257_dma_init(isa_bus, 0, &error_fatal);
     mc146818_rtc_init(isa_bus, 2000, NULL);
 
     /* generate SPD EEPROM data */
diff --git a/include/hw/dma/i8257.h b/include/hw/dma/i8257.h
index 2cab50bb6c..d3f89393fe 100644
--- a/include/hw/dma/i8257.h
+++ b/include/hw/dma/i8257.h
@@ -44,6 +44,6 @@  typedef struct I8257State {
     PortioList portio_pageh;
 } I8257State;
 
-void i8257_dma_init(ISABus *bus, bool high_page_enable);
+void i8257_dma_init(ISABus *bus, bool high_page_enable, Error **error_fatal);
 
 #endif
diff --git a/include/hw/isa/isa.h b/include/hw/isa/isa.h
index b9dbab24b4..eb89654d24 100644
--- a/include/hw/isa/isa.h
+++ b/include/hw/isa/isa.h
@@ -103,7 +103,7 @@  void isa_bus_irqs(ISABus *bus, qemu_irq *irqs);
 qemu_irq isa_get_irq(ISADevice *dev, int isairq);
 void isa_init_irq(ISADevice *dev, qemu_irq *p, int isairq);
 void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, int isairq);
-void isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16);
+int isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16, Error ** error_fatal);
 IsaDma *isa_get_dma(ISABus *bus, int nchan);
 MemoryRegion *isa_address_space(ISADevice *dev);
 MemoryRegion *isa_address_space_io(ISADevice *dev);
diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
index 9453588160..238ad2f6f3 100644
--- a/include/hw/qdev-core.h
+++ b/include/hw/qdev-core.h
@@ -283,6 +283,7 @@  typedef struct GlobalProperty {
 DeviceState *qdev_create(BusState *bus, const char *name);
 DeviceState *qdev_try_create(BusState *bus, const char *name);
 void qdev_init_nofail(DeviceState *dev);
+void qdev_cleanup_nofail(DeviceState *dev);
 void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
                                  int required_for_version);
 HotplugHandler *qdev_get_machine_hotplug_handler(DeviceState *dev);