diff options
| -rw-r--r-- | hw/acpi_piix4.c | 74 |
1 files changed, 53 insertions, 21 deletions
diff --git a/hw/acpi_piix4.c b/hw/acpi_piix4.c index 5e8b261b74..0e7af51063 100644 --- a/hw/acpi_piix4.c +++ b/hw/acpi_piix4.c @@ -48,7 +48,7 @@ #define PIIX4_PCI_HOTPLUG_STATUS 2 struct pci_status { - uint32_t up; + uint32_t up; /* deprecated, maintained for migration compatibility */ uint32_t down; }; @@ -70,6 +70,7 @@ typedef struct PIIX4PMState { /* for pci hotplug */ struct pci_status pci0_status; uint32_t pci0_hotplug_enable; + uint32_t pci0_slot_device_present; } PIIX4PMState; static void piix4_acpi_system_hot_add_init(PCIBus *bus, PIIX4PMState *s); @@ -205,6 +206,17 @@ static void pm_write_config(PCIDevice *d, pm_io_space_update((PIIX4PMState *)d); } +static void vmstate_pci_status_pre_save(void *opaque) +{ + struct pci_status *pci0_status = opaque; + PIIX4PMState *s = container_of(pci0_status, PIIX4PMState, pci0_status); + + /* We no longer track up, so build a safe value for migrating + * to a version that still does... of course these might get lost + * by an old buggy implementation, but we try. */ + pci0_status->up = s->pci0_slot_device_present & s->pci0_hotplug_enable; +} + static int vmstate_acpi_post_load(void *opaque, int version_id) { PIIX4PMState *s = opaque; @@ -241,6 +253,7 @@ static const VMStateDescription vmstate_pci_status = { .version_id = 1, .minimum_version_id = 1, .minimum_version_id_old = 1, + .pre_save = vmstate_pci_status_pre_save, .fields = (VMStateField []) { VMSTATE_UINT32(up, struct pci_status), VMSTATE_UINT32(down, struct pci_status), @@ -269,13 +282,38 @@ static const VMStateDescription vmstate_acpi = { } }; +static void acpi_piix_eject_slot(PIIX4PMState *s, unsigned slots) +{ + DeviceState *qdev, *next; + BusState *bus = qdev_get_parent_bus(&s->dev.qdev); + int slot = ffs(slots) - 1; + + /* Mark request as complete */ + s->pci0_status.down &= ~(1U << slot); + + QTAILQ_FOREACH_SAFE(qdev, &bus->children, sibling, next) { + PCIDevice *dev = PCI_DEVICE(qdev); + PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev); + if (PCI_SLOT(dev->devfn) == slot && !pc->no_hotplug) { + s->pci0_slot_device_present &= ~(1U << slot); + qdev_free(qdev); + } + } +} + static void piix4_update_hotplug(PIIX4PMState *s) { PCIDevice *dev = &s->dev; BusState *bus = qdev_get_parent_bus(&dev->qdev); DeviceState *qdev, *next; + /* Execute any pending removes during reset */ + while (s->pci0_status.down) { + acpi_piix_eject_slot(s, s->pci0_status.down); + } + s->pci0_hotplug_enable = ~0; + s->pci0_slot_device_present = 0; QTAILQ_FOREACH_SAFE(qdev, &bus->children, sibling, next) { PCIDevice *pdev = PCI_DEVICE(qdev); @@ -283,8 +321,10 @@ static void piix4_update_hotplug(PIIX4PMState *s) int slot = PCI_SLOT(pdev->devfn); if (pc->no_hotplug) { - s->pci0_hotplug_enable &= ~(1 << slot); + s->pci0_hotplug_enable &= ~(1U << slot); } + + s->pci0_slot_device_present |= (1U << slot); } } @@ -452,7 +492,11 @@ static void gpe_writeb(void *opaque, uint32_t addr, uint32_t val) static uint32_t pci_up_read(void *opaque, uint32_t addr) { PIIX4PMState *s = opaque; - uint32_t val = s->pci0_status.up; + uint32_t val; + + /* Manufacture an "up" value to cause a device check on any hotplug + * slot with a device. Extra device checks are harmless. */ + val = s->pci0_slot_device_present & s->pci0_hotplug_enable; PIIX4_DPRINTF("pci_up_read %x\n", val); return val; @@ -475,18 +519,7 @@ static uint32_t pciej_read(void *opaque, uint32_t addr) static void pciej_write(void *opaque, uint32_t addr, uint32_t val) { - BusState *bus = opaque; - DeviceState *qdev, *next; - int slot = ffs(val) - 1; - - QTAILQ_FOREACH_SAFE(qdev, &bus->children, sibling, next) { - PCIDevice *dev = PCI_DEVICE(qdev); - PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev); - if (PCI_SLOT(dev->devfn) == slot && !pc->no_hotplug) { - qdev_free(qdev); - } - } - + acpi_piix_eject_slot(opaque, val); PIIX4_DPRINTF("pciej write %x <== %d\n", addr, val); } @@ -516,8 +549,8 @@ static void piix4_acpi_system_hot_add_init(PCIBus *bus, PIIX4PMState *s) register_ioport_read(PCI_UP_BASE, 4, 4, pci_up_read, s); register_ioport_read(PCI_DOWN_BASE, 4, 4, pci_down_read, 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_EJ_BASE, 4, 4, pciej_write, s); + register_ioport_read(PCI_EJ_BASE, 4, 4, pciej_read, s); register_ioport_write(PCI_RMV_BASE, 4, 4, pcirmv_write, s); register_ioport_read(PCI_RMV_BASE, 4, 4, pcirmv_read, s); @@ -528,13 +561,13 @@ static void piix4_acpi_system_hot_add_init(PCIBus *bus, PIIX4PMState *s) static void enable_device(PIIX4PMState *s, int slot) { s->ar.gpe.sts[0] |= PIIX4_PCI_HOTPLUG_STATUS; - s->pci0_status.up |= (1 << slot); + s->pci0_slot_device_present |= (1U << slot); } static void disable_device(PIIX4PMState *s, int slot) { s->ar.gpe.sts[0] |= PIIX4_PCI_HOTPLUG_STATUS; - s->pci0_status.down |= (1 << slot); + s->pci0_status.down |= (1U << slot); } static int piix4_device_hotplug(DeviceState *qdev, PCIDevice *dev, @@ -548,11 +581,10 @@ static int piix4_device_hotplug(DeviceState *qdev, PCIDevice *dev, * it is present on boot, no hotplug event is necessary. We do send an * event when the device is disabled later. */ if (state == PCI_COLDPLUG_ENABLED) { + s->pci0_slot_device_present |= (1U << slot); return 0; } - s->pci0_status.up = 0; - s->pci0_status.down = 0; if (state == PCI_HOTPLUG_ENABLED) { enable_device(s, slot); } else { |