void pcie_cap_slot_write_config(PCIDevice *dev,
uint32_t addr, uint32_t val, int len)
{
uint32_t pos = dev->exp.exp_cap;
uint8_t *exp_cap = dev->config + pos;
uint16_t sltsta = pci_get_word(exp_cap + PCI_EXP_SLTSTA);
if (ranges_overlap(addr, len, pos + PCI_EXP_SLTSTA, 2)) {
hotplug_event_clear(dev);
}
if (!ranges_overlap(addr, len, pos + PCI_EXP_SLTCTL, 2)) {
return;
}
if (pci_word_test_and_clear_mask(exp_cap + PCI_EXP_SLTCTL,
PCI_EXP_SLTCTL_EIC)) {
sltsta ^= PCI_EXP_SLTSTA_EIS; /* toggle PCI_EXP_SLTSTA_EIS bit */
pci_set_word(exp_cap + PCI_EXP_SLTSTA, sltsta);
PCIE_DEV_PRINTF(dev, "PCI_EXP_SLTCTL_EIC: "
"sltsta -> 0x%02"PRIx16"\n",
sltsta);
}
/*
* If the slot is polulated, power indicator is off and power
* controller is off, it is safe to detach the devices.
*/
if ((sltsta & PCI_EXP_SLTSTA_PDS) && (val & PCI_EXP_SLTCTL_PCC) &&
((val & PCI_EXP_SLTCTL_PIC_OFF) == PCI_EXP_SLTCTL_PIC_OFF)) {
PCIBus *sec_bus = pci_bridge_get_sec_bus(PCI_BRIDGE(dev));
pci_for_each_device(sec_bus, pci_bus_num(sec_bus),
pcie_unplug_device, NULL);
pci_word_test_and_clear_mask(exp_cap + PCI_EXP_SLTSTA,
PCI_EXP_SLTSTA_PDS);
pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
PCI_EXP_SLTSTA_PDC);
}
hotplug_event_notify(dev);
/*
* 6.7.3.2 Command Completed Events
*
* Software issues a command to a hot-plug capable Downstream Port by
* issuing a write transaction that targets any portion of the Port’s Slot
* Control register. A single write to the Slot Control register is
* considered to be a single command, even if the write affects more than
* one field in the Slot Control register. In response to this transaction,
* the Port must carry out the requested actions and then set the
* associated status field for the command completed event. */
/* Real hardware might take a while to complete requested command because
* physical movement would be involved like locking the electromechanical
* lock. However in our case, command is completed instantaneously above,
* so send a command completion event right now.
*/
pcie_cap_slot_event(dev, PCI_EXP_HP_EV_CCI);
}
void pcie_cap_slot_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
Error **errp)
{
PCIDevice *hotplug_pdev = PCI_DEVICE(hotplug_dev);
uint8_t *exp_cap = hotplug_pdev->config + hotplug_pdev->exp.exp_cap;
PCIDevice *pci_dev = PCI_DEVICE(dev);
/* Don't send event when device is enabled during qemu machine creation:
* it is present on boot, no hotplug event is necessary. We do send an
* event when the device is disabled later. */
if (!dev->hotplugged) {
pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
PCI_EXP_SLTSTA_PDS);
if (pci_dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA,
PCI_EXP_LNKSTA_DLLLA);
}
return;
}
/* To enable multifunction hot-plug, we just ensure the function
* 0 added last. When function 0 is added, we set the sltsta and
* inform OS via event notification.
*/
if (pci_get_function_0(pci_dev)) {
pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
PCI_EXP_SLTSTA_PDS);
if (pci_dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA,
PCI_EXP_LNKSTA_DLLLA);
}
pcie_cap_slot_event(PCI_DEVICE(hotplug_dev),
PCI_EXP_HP_EV_PDC | PCI_EXP_HP_EV_ABP);
}
}
void pcie_cap_slot_hotplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
Error **errp)
{
uint8_t *exp_cap;
PCIDevice *pci_dev = PCI_DEVICE(dev);
pcie_cap_slot_hotplug_common(PCI_DEVICE(hotplug_dev), dev, &exp_cap, errp);
/* Don't send event when device is enabled during qemu machine creation:
* it is present on boot, no hotplug event is necessary. We do send an
* event when the device is disabled later. */
if (!dev->hotplugged) {
pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
PCI_EXP_SLTSTA_PDS);
return;
}
/* TODO: multifunction hot-plug.
* Right now, only a device of function = 0 is allowed to be
* hot plugged/unplugged.
*/
assert(PCI_FUNC(pci_dev->devfn) == 0);
pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
PCI_EXP_SLTSTA_PDS);
pcie_cap_slot_event(PCI_DEVICE(hotplug_dev),
PCI_EXP_HP_EV_PDC | PCI_EXP_HP_EV_ABP);
}
static int pcie_cap_slot_hotplug(DeviceState *qdev,
PCIDevice *pci_dev, PCIHotplugState state)
{
PCIDevice *d = PCI_DEVICE(qdev);
uint8_t *exp_cap = d->config + d->exp.exp_cap;
uint16_t sltsta = pci_get_word(exp_cap + PCI_EXP_SLTSTA);
/* Don't send event when device is enabled during qemu machine creation:
* 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) {
pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
PCI_EXP_SLTSTA_PDS);
return 0;
}
PCIE_DEV_PRINTF(pci_dev, "hotplug state: %d\n", state);
if (sltsta & PCI_EXP_SLTSTA_EIS) {
/* the slot is electromechanically locked.
* This error is propagated up to qdev and then to HMP/QMP.
*/
return -EBUSY;
}
/* TODO: multifunction hot-plug.
* Right now, only a device of function = 0 is allowed to be
* hot plugged/unplugged.
*/
assert(PCI_FUNC(pci_dev->devfn) == 0);
if (state == PCI_HOTPLUG_ENABLED) {
pci_word_test_and_set_mask(exp_cap + PCI_EXP_SLTSTA,
PCI_EXP_SLTSTA_PDS);
pcie_cap_slot_event(d, PCI_EXP_HP_EV_PDC);
} else {
object_unparent(OBJECT(pci_dev));
pci_word_test_and_clear_mask(exp_cap + PCI_EXP_SLTSTA,
PCI_EXP_SLTSTA_PDS);
pcie_cap_slot_event(d, PCI_EXP_HP_EV_PDC);
}
return 0;
}
void pcie_cap_slot_push_attention_button(PCIDevice *dev)
{
pcie_cap_slot_event(dev, PCI_EXP_HP_EV_ABP);
}
