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5a2223ca26
PIIX created a made-up value for the UP register since it was read by guest 32 times for each interrupt. There's no reason to do this for the new PCIHP: register is only read once for each interrupt, so clean up code by making read act as an interrupt acknowledgement: the new UP register clear on read. In this way we cut down the number of bus rescans by a factor of 32, and drop a bunch of code that's now unused. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/*
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* QEMU<->ACPI BIOS PCI hotplug interface
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*
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* QEMU supports PCI hotplug via ACPI. This module
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* implements the interface between QEMU and the ACPI BIOS.
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* Interface specification - see docs/specs/acpi_pci_hotplug.txt
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*
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* Copyright (c) 2013, Red Hat Inc, Michael S. Tsirkin (mst@redhat.com)
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* Copyright (c) 2006 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2 as published by the Free Software Foundation.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#ifndef HW_ACPI_PCIHP_H
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#define HW_ACPI_PCIHP_H
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#include <inttypes.h>
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#include <qemu/typedefs.h>
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#include "hw/pci/pci.h" /* for PCIHotplugState */
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typedef struct AcpiPciHpPciStatus {
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uint32_t up;
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uint32_t down;
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uint32_t hotplug_enable;
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uint32_t device_present;
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} AcpiPciHpPciStatus;
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#define ACPI_PCIHP_PROP_BSEL "acpi-pcihp-bsel"
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#define ACPI_PCIHP_MAX_HOTPLUG_BUS 256
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typedef struct AcpiPciHpState {
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AcpiPciHpPciStatus acpi_pcihp_pci_status[ACPI_PCIHP_MAX_HOTPLUG_BUS];
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uint32_t hotplug_select;
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PCIBus *root;
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MemoryRegion io;
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} AcpiPciHpState;
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void acpi_pcihp_init(AcpiPciHpState *, PCIBus *root,
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MemoryRegion *address_space_io);
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/* Invoke on device hotplug */
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int acpi_pcihp_device_hotplug(AcpiPciHpState *, PCIDevice *,
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PCIHotplugState state);
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/* Called on reset */
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void acpi_pcihp_reset(AcpiPciHpState *s);
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extern const VMStateDescription vmstate_acpi_pcihp_pci_status;
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#define VMSTATE_PCI_HOTPLUG(pcihp, state, test_pcihp) \
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VMSTATE_UINT32_TEST(pcihp.hotplug_select, state, \
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test_pcihp), \
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VMSTATE_STRUCT_ARRAY_TEST(pcihp.acpi_pcihp_pci_status, state, \
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ACPI_PCIHP_MAX_HOTPLUG_BUS, \
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test_pcihp, 1, \
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vmstate_acpi_pcihp_pci_status, \
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AcpiPciHpPciStatus)
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#endif
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