From db4728e6fec0364b866d3106125974eedc00e091 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Mon, 14 Oct 2013 18:01:11 +0300 Subject: pcihp: generalization of piix4 acpi Add ACPI based PCI hotplug library with bridge hotplug support. Design - each bus gets assigned "bsel" property. - ACPI code writes this number to a new BNUM register, then uses existing UP/DOWN registers to probe slot status; to eject, write number to BNUM register, then slot into existing EJ. The interface is actually backwards-compatible with existing PIIX4 ACPI (though not migration compatible). This is split out from PIIX4 codebase so we can reuse it for Q35 as well. Signed-off-by: Michael S. Tsirkin --- include/hw/acpi/pcihp.h | 72 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 include/hw/acpi/pcihp.h (limited to 'include/hw') diff --git a/include/hw/acpi/pcihp.h b/include/hw/acpi/pcihp.h new file mode 100644 index 0000000..6230e60 --- /dev/null +++ b/include/hw/acpi/pcihp.h @@ -0,0 +1,72 @@ +/* + * QEMU<->ACPI BIOS PCI hotplug interface + * + * QEMU supports PCI hotplug via ACPI. This module + * implements the interface between QEMU and the ACPI BIOS. + * Interface specification - see docs/specs/acpi_pci_hotplug.txt + * + * Copyright (c) 2013, Red Hat Inc, Michael S. Tsirkin (mst@redhat.com) + * Copyright (c) 2006 Fabrice Bellard + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License version 2 as published by the Free Software Foundation. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see + * + * Contributions after 2012-01-13 are licensed under the terms of the + * GNU GPL, version 2 or (at your option) any later version. + */ + +#ifndef HW_ACPI_PCIHP_H +#define HW_ACPI_PCIHP_H + +#include +#include +#include "hw/pci/pci.h" /* for PCIHotplugState */ + +typedef struct AcpiPciHpPciStatus { + uint32_t up; /* deprecated, maintained for migration compatibility */ + uint32_t down; + uint32_t hotplug_enable; + uint32_t device_present; +} AcpiPciHpPciStatus; + +#define ACPI_PCIHP_PROP_BSEL "acpi-pcihp-bsel" +#define ACPI_PCIHP_MAX_HOTPLUG_BUS 256 + +typedef struct AcpiPciHpState { + AcpiPciHpPciStatus acpi_pcihp_pci_status[ACPI_PCIHP_MAX_HOTPLUG_BUS]; + uint32_t hotplug_select; + PCIBus *root; + MemoryRegion io; +} AcpiPciHpState; + +void acpi_pcihp_init(AcpiPciHpState *, PCIBus *root, + MemoryRegion *address_space_io); + +/* Invoke on device hotplug */ +int acpi_pcihp_device_hotplug(AcpiPciHpState *, PCIDevice *, + PCIHotplugState state); + +/* Called on reset */ +void acpi_pcihp_reset(AcpiPciHpState *s); + +extern const VMStateDescription vmstate_acpi_pcihp_pci_status; + +#define VMSTATE_PCI_HOTPLUG(pcihp, state, test_pcihp) \ + VMSTATE_UINT32_TEST(pcihp.hotplug_select, state, \ + test_pcihp), \ + VMSTATE_STRUCT_ARRAY_TEST(pcihp.acpi_pcihp_pci_status, state, \ + ACPI_PCIHP_MAX_HOTPLUG_BUS, \ + test_pcihp, 1, \ + vmstate_acpi_pcihp_pci_status, \ + AcpiPciHpPciStatus) + +#endif -- cgit v1.1