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isa: Clean up error handling around isa_bus_new()

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We can have at most one ISA bus.  If you try to create another one,
isa_bus_new() complains to stderr and returns null.

isa_bus_new() is called in two contexts, machine's init() and device's
realize() methods.  Since complaining to stderr is not proper in the
latter context, convert isa_bus_new() to Error.

Machine's init():

* mips_jazz_init(), called from the init() methods of machines
  "magnum" and "pica"

* mips_r4k_init(), the init() method of machine "mips"

* pc_init1() called from the init() methods of non-q35 PC machines

* typhoon_init(), called from clipper_init(), the init() method of
  machine "clipper"

These callers always create the first ISA bus, hence isa_bus_new()
can't fail.  Simply pass &error_abort.

Device's realize():

* i82378_realize(), of PCI device "i82378"

* ich9_lpc_realize(), of PCI device "ICH9-LPC"

* pci_ebus_realize(), of PCI device "ebus"

* piix3_realize(), of PCI device "pci-piix3", abstract parent of
  "PIIX3" and "PIIX3-xen"

* piix4_realize(), of PCI device "PIIX4"

* vt82c686b_realize(), of PCI device "VT82C686B"

Propagate the error.  Note that these devices are typically created
only by machine init() methods with qdev_init_nofail() or similar.  If
we screwed up and created an ISA bus before that call, we now give up
right away.  Before, we'd hobble on, and typically die in
isa_bus_irqs().  Similar if someone finds a way to hot-plug one of
these critters.

Cc: Richard Henderson <rth@twiddle.net>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: "Hervé Poussineau" <hpoussin@reactos.org>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Hervé Poussineau <hpoussin@reactos.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <1450370121-5768-11-git-send-email-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2015-12-17 17:35:18 +01:00
parent 3a80ceadcb
commit d10e54329b
12 changed files with 34 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
hw/alpha/typhoon.c
View File

@ -920,7 +920,8 @@ PCIBus *typhoon_init(ram_addr_t ram_size, ISABus **isa_bus,
{
qemu_irq *isa_irqs;
*isa_bus = isa_bus_new(NULL, get_system_memory(), &s->pchip.reg_io);
*isa_bus = isa_bus_new(NULL, get_system_memory(), &s->pchip.reg_io,
&error_abort);
isa_irqs = i8259_init(*isa_bus,
qemu_allocate_irq(typhoon_set_isa_irq, s, 0));
isa_bus_irqs(*isa_bus, isa_irqs);

3
hw/i386/pc_piix.c
View File

@ -189,7 +189,8 @@ static void pc_init1(MachineState *machine,
} else {
pci_bus = NULL;
i440fx_state = NULL;
isa_bus = isa_bus_new(NULL, get_system_memory(), system_io);
isa_bus = isa_bus_new(NULL, get_system_memory(), system_io,
&error_abort);
no_hpet = 1;
}
isa_bus_irqs(isa_bus, gsi);

5
hw/isa/i82378.c
View File

@ -75,7 +75,10 @@ static void i82378_realize(PCIDevice *pci, Error **errp)
pci_config_set_interrupt_pin(pci_conf, 1); /* interrupt pin 0 */
isabus = isa_bus_new(dev, get_system_memory(),
pci_address_space_io(pci));
pci_address_space_io(pci), errp);
if (!isabus) {
return;
}
/* This device has:
2 82C59 (irq)

4
hw/isa/isa-bus.c
View File

@ -44,10 +44,10 @@ static const TypeInfo isa_bus_info = {
};
ISABus *isa_bus_new(DeviceState *dev, MemoryRegion* address_space,
MemoryRegion *address_space_io)
MemoryRegion *address_space_io, Error **errp)
{
if (isabus) {
fprintf(stderr, "Can't create a second ISA bus\n");
error_setg(errp, "Can't create a second ISA bus");
return NULL;
}
if (!dev) {

6
hw/isa/lpc_ich9.c
View File

@ -607,7 +607,11 @@ static void ich9_lpc_realize(PCIDevice *d, Error **errp)
ICH9LPCState *lpc = ICH9_LPC_DEVICE(d);
ISABus *isa_bus;
isa_bus = isa_bus_new(DEVICE(d), get_system_memory(), get_system_io());
isa_bus = isa_bus_new(DEVICE(d), get_system_memory(), get_system_io(),
errp);
if (!isa_bus) {
return;
}
pci_set_long(d->wmask + ICH9_LPC_PMBASE,
ICH9_LPC_PMBASE_BASE_ADDRESS_MASK);

6
hw/isa/piix4.c
View File

@ -90,8 +90,10 @@ static void piix4_realize(PCIDevice *dev, Error **errp)
{
PIIX4State *d = PIIX4_PCI_DEVICE(dev);
isa_bus_new(DEVICE(d), pci_address_space(dev),
pci_address_space_io(dev));
if (!isa_bus_new(DEVICE(d), pci_address_space(dev),
pci_address_space_io(dev), errp)) {
return;
}
piix4_dev = &d->dev;
qemu_register_reset(piix4_reset, d);
}

5
hw/isa/vt82c686.c
View File

@ -440,7 +440,10 @@ static void vt82c686b_realize(PCIDevice *d, Error **errp)
int i;
isa_bus = isa_bus_new(DEVICE(d), get_system_memory(),
pci_address_space_io(d));
pci_address_space_io(d), errp);
if (!isa_bus) {
return;
}
pci_conf = d->config;
pci_config_set_prog_interface(pci_conf, 0x0);

2
hw/mips/mips_jazz.c
View File

@ -219,7 +219,7 @@ static void mips_jazz_init(MachineState *machine,
memory_region_init(isa_mem, NULL, "isa-mem", 0x01000000);
memory_region_add_subregion(address_space, 0x90000000, isa_io);
memory_region_add_subregion(address_space, 0x91000000, isa_mem);
isa_bus = isa_bus_new(NULL, isa_mem, isa_io);
isa_bus = isa_bus_new(NULL, isa_mem, isa_io, &error_abort);
/* ISA devices */
i8259 = i8259_init(isa_bus, env->irq[4]);

2
hw/mips/mips_r4k.c
View File

@ -272,7 +272,7 @@ void mips_r4k_init(MachineState *machine)
memory_region_init(isa_mem, NULL, "isa-mem", 0x01000000);
memory_region_add_subregion(get_system_memory(), 0x14000000, isa_io);
memory_region_add_subregion(get_system_memory(), 0x10000000, isa_mem);
isa_bus = isa_bus_new(NULL, isa_mem, get_system_io());
isa_bus = isa_bus_new(NULL, isa_mem, get_system_io(), &error_abort);
/* The PIC is attached to the MIPS CPU INT0 pin */
i8259 = i8259_init(isa_bus, env->irq[2]);

6
hw/pci-host/piix.c
View File

@ -651,8 +651,10 @@ static void piix3_realize(PCIDevice *dev, Error **errp)
{
PIIX3State *d = PIIX3_PCI_DEVICE(dev);
isa_bus_new(DEVICE(d), get_system_memory(),
pci_address_space_io(dev));
if (!isa_bus_new(DEVICE(d), get_system_memory(),
pci_address_space_io(dev), errp)) {
return;
}
memory_region_init_io(&d->rcr_mem, OBJECT(dev), &rcr_ops, d,
"piix3-reset-control", 1);

6
hw/sparc64/sun4u.c
View File

@ -604,8 +604,10 @@ static void pci_ebus_realize(PCIDevice *pci_dev, Error **errp)
{
EbusState *s = DO_UPCAST(EbusState, pci_dev, pci_dev);
isa_bus_new(DEVICE(pci_dev), get_system_memory(),
pci_address_space_io(pci_dev));
if (!isa_bus_new(DEVICE(pci_dev), get_system_memory(),
pci_address_space_io(pci_dev), errp)) {
return;
}
pci_dev->config[0x04] = 0x06; // command = bus master, pci mem
pci_dev->config[0x05] = 0x00;

2
include/hw/isa/isa.h
View File

@ -59,7 +59,7 @@ struct ISADevice {
};
ISABus *isa_bus_new(DeviceState *dev, MemoryRegion *address_space,
MemoryRegion *address_space_io);
MemoryRegion *address_space_io, Error **errp);
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);