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acpi_piix4: expose no_hotplug attribute via i/o port 

Expose no_hotplug attribute via I/O port, so ACPI BIOS can indicate
removability status to guest OS.

An updated seabios is required to make use of this feature (seabios.git
commit ID 3c241edf3d7ef29c21).

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Tested-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Marcelo Tosatti 2011-01-11 14:20:39 -02:00 committed by Michael S. Tsirkin
parent 9c046d96d4
commit 668643b025
1 changed files with 37 additions and 0 deletions
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37
hw/acpi_piix4.c
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@ -37,6 +37,7 @@
#define GPE_BASE 0xafe0
#define PCI_BASE 0xae00
#define PCI_EJ_BASE 0xae08
#define PCI_RMV_BASE 0xae0c
#define PIIX4_PCI_HOTPLUG_STATUS 2
@ -73,6 +74,7 @@ typedef struct PIIX4PMState {
/* for pci hotplug */
struct gpe_regs gpe;
struct pci_status pci0_status;
uint32_t pci0_hotplug_enable;
} PIIX4PMState;
static void piix4_acpi_system_hot_add_init(PCIBus *bus, PIIX4PMState *s);
@ -322,6 +324,25 @@ static const VMStateDescription vmstate_acpi = {
}
};
static void piix4_update_hotplug(PIIX4PMState *s)
{
PCIDevice *dev = &s->dev;
BusState *bus = qdev_get_parent_bus(&dev->qdev);
DeviceState *qdev, *next;
s->pci0_hotplug_enable = ~0;
QLIST_FOREACH_SAFE(qdev, &bus->children, sibling, next) {
PCIDeviceInfo *info = container_of(qdev->info, PCIDeviceInfo, qdev);
PCIDevice *pdev = DO_UPCAST(PCIDevice, qdev, qdev);
int slot = PCI_SLOT(pdev->devfn);
if (info->no_hotplug) {
s->pci0_hotplug_enable &= ~(1 << slot);
}
}
}
static void piix4_reset(void *opaque)
{
PIIX4PMState *s = opaque;
@ -336,6 +357,7 @@ static void piix4_reset(void *opaque)
/* Mark SMM as already inited (until KVM supports SMM). */
pci_conf[0x5B] = 0x02;
}
piix4_update_hotplug(s);
}
static void piix4_powerdown(void *opaque, int irq, int power_failing)
@ -576,6 +598,18 @@ static void pciej_write(void *opaque, uint32_t addr, uint32_t val)
PIIX4_DPRINTF("pciej write %x <== %d\n", addr, val);
}
static uint32_t pcirmv_read(void *opaque, uint32_t addr)
{
PIIX4PMState *s = opaque;
return s->pci0_hotplug_enable;
}
static void pcirmv_write(void *opaque, uint32_t addr, uint32_t val)
{
return;
}
static int piix4_device_hotplug(DeviceState *qdev, PCIDevice *dev,
PCIHotplugState state);
@ -592,6 +626,9 @@ static void piix4_acpi_system_hot_add_init(PCIBus *bus, PIIX4PMState *s)
register_ioport_write(PCI_EJ_BASE, 4, 4, pciej_write, bus);
register_ioport_read(PCI_EJ_BASE, 4, 4, pciej_read, bus);
register_ioport_write(PCI_RMV_BASE, 4, 4, pcirmv_write, s);
register_ioport_read(PCI_RMV_BASE, 4, 4, pcirmv_read, s);
pci_bus_hotplug(bus, piix4_device_hotplug, &s->dev.qdev);
}