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pcihp: generalization of piix4 acpi

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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 <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2013-10-14 18:01:11 +03:00
parent eb0acfdde6
commit db4728e6fe
3 changed files with 389 additions and 2 deletions
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72
include/hw/acpi/pcihp.h Normal file
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/*
* 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 <http://www.gnu.org/licenses/>
*
* 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 <inttypes.h>
#include <qemu/typedefs.h>
#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