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pci: Add generic PCIe host bridge

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With simple exposure of MMFG, ioport window, mmio window and an IRQ line we
can successfully create a workable PCIe host bridge that can be mapped anywhere
and only needs to get described to the OS using whatever means it likes.

This patch implements such a "generic" host bridge. It handles 4 legacy IRQ
lines. MSIs need to be handled external to the host bridge.

This device is particularly useful for the "pci-host-ecam-generic" driver in
Linux.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Claudio Fontana <claudio.fontana@huawei.com>
Tested-by: Claudio Fontana <claudio.fontana@huawei.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Alexander Graf 2015-02-13 05:46:07 +00:00 committed by Peter Maydell
parent bf439db499
commit 4d8fde1126
3 changed files with 211 additions and 0 deletions
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1
hw/pci-host/Makefile.objs
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@ -15,3 +15,4 @@ common-obj-$(CONFIG_PCI_APB) += apb.o
common-obj-$(CONFIG_FULONG) += bonito.o
common-obj-$(CONFIG_PCI_PIIX) += piix.o
common-obj-$(CONFIG_PCI_Q35) += q35.o
common-obj-$(CONFIG_PCI_GENERIC) += gpex.o

154
hw/pci-host/gpex.c Normal file
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@ -0,0 +1,154 @@
/*
* QEMU Generic PCI Express Bridge Emulation
*
* Copyright (C) 2015 Alexander Graf <agraf@suse.de>
*
* Code loosely based on q35.c.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* Check out these documents for more information on the device:
*
* http://www.kernel.org/doc/Documentation/devicetree/bindings/pci/host-generic-pci.txt
* http://www.firmware.org/1275/practice/imap/imap0_9d.pdf
*/
#include "hw/hw.h"
#include "hw/pci-host/gpex.h"
/****************************************************************************
* GPEX host
*/
static void gpex_set_irq(void *opaque, int irq_num, int level)
{
GPEXHost *s = opaque;
qemu_set_irq(s->irq[irq_num], level);
}
static void gpex_host_realize(DeviceState *dev, Error **errp)
{
PCIHostState *pci = PCI_HOST_BRIDGE(dev);
GPEXHost *s = GPEX_HOST(dev);
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
PCIExpressHost *pex = PCIE_HOST_BRIDGE(dev);
int i;
pcie_host_mmcfg_init(pex, PCIE_MMCFG_SIZE_MAX);
memory_region_init(&s->io_mmio, OBJECT(s), "gpex_mmio", UINT64_MAX);
memory_region_init(&s->io_ioport, OBJECT(s), "gpex_ioport", 64 * 1024);
sysbus_init_mmio(sbd, &pex->mmio);
sysbus_init_mmio(sbd, &s->io_mmio);
sysbus_init_mmio(sbd, &s->io_ioport);
for (i = 0; i < GPEX_NUM_IRQS; i++) {
sysbus_init_irq(sbd, &s->irq[i]);
}
pci->bus = pci_register_bus(dev, "pcie.0", gpex_set_irq,
pci_swizzle_map_irq_fn, s, &s->io_mmio,
&s->io_ioport, 0, 4, TYPE_PCIE_BUS);
qdev_set_parent_bus(DEVICE(&s->gpex_root), BUS(pci->bus));
qdev_init_nofail(DEVICE(&s->gpex_root));
}
static const char *gpex_host_root_bus_path(PCIHostState *host_bridge,
PCIBus *rootbus)
{
return "0000:00";
}
static void gpex_host_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
hc->root_bus_path = gpex_host_root_bus_path;
dc->realize = gpex_host_realize;
set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
dc->fw_name = "pci";
}
static void gpex_host_initfn(Object *obj)
{
GPEXHost *s = GPEX_HOST(obj);
GPEXRootState *root = &s->gpex_root;
object_initialize(root, sizeof(*root), TYPE_GPEX_ROOT_DEVICE);
object_property_add_child(obj, "gpex_root", OBJECT(root), NULL);
qdev_prop_set_uint32(DEVICE(root), "addr", PCI_DEVFN(0, 0));
qdev_prop_set_bit(DEVICE(root), "multifunction", false);
}
static const TypeInfo gpex_host_info = {
.name = TYPE_GPEX_HOST,
.parent = TYPE_PCIE_HOST_BRIDGE,
.instance_size = sizeof(GPEXHost),
.instance_init = gpex_host_initfn,
.class_init = gpex_host_class_init,
};
/****************************************************************************
* GPEX Root D0:F0
*/
static const VMStateDescription vmstate_gpex_root = {
.name = "gpex_root",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_PCI_DEVICE(parent_obj, GPEXRootState),
VMSTATE_END_OF_LIST()
}
};
static void gpex_root_class_init(ObjectClass *klass, void *data)
{
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
DeviceClass *dc = DEVICE_CLASS(klass);
set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
dc->desc = "QEMU generic PCIe host bridge";
dc->vmsd = &vmstate_gpex_root;
k->vendor_id = PCI_VENDOR_ID_REDHAT;
k->device_id = PCI_DEVICE_ID_REDHAT_PCIE_HOST;
k->revision = 0;
k->class_id = PCI_CLASS_BRIDGE_HOST;
/*
* PCI-facing part of the host bridge, not usable without the
* host-facing part, which can't be device_add'ed, yet.
*/
dc->cannot_instantiate_with_device_add_yet = true;
}
static const TypeInfo gpex_root_info = {
.name = TYPE_GPEX_ROOT_DEVICE,
.parent = TYPE_PCI_DEVICE,
.instance_size = sizeof(GPEXRootState),
.class_init = gpex_root_class_init,
};
static void gpex_register(void)
{
type_register_static(&gpex_root_info);
type_register_static(&gpex_host_info);
}
type_init(gpex_register)

56
include/hw/pci-host/gpex.h Normal file
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@ -0,0 +1,56 @@
/*
* QEMU Generic PCI Express Bridge Emulation
*
* Copyright (C) 2015 Alexander Graf <agraf@suse.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 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/>
*/
#ifndef HW_GPEX_H
#define HW_GPEX_H
#include "hw/hw.h"
#include "hw/sysbus.h"
#include "hw/pci/pci.h"
#include "hw/pci/pcie_host.h"
#define TYPE_GPEX_HOST "gpex-pcihost"
#define GPEX_HOST(obj) \
OBJECT_CHECK(GPEXHost, (obj), TYPE_GPEX_HOST)
#define TYPE_GPEX_ROOT_DEVICE "gpex-root"
#define MCH_PCI_DEVICE(obj) \
OBJECT_CHECK(GPEXRootState, (obj), TYPE_GPEX_ROOT_DEVICE)
#define GPEX_NUM_IRQS 4
typedef struct GPEXRootState {
/*< private >*/
PCIDevice parent_obj;
/*< public >*/
} GPEXRootState;
typedef struct GPEXHost {
/*< private >*/
PCIExpressHost parent_obj;
/*< public >*/
GPEXRootState gpex_root;
MemoryRegion io_ioport;
MemoryRegion io_mmio;
qemu_irq irq[GPEX_NUM_IRQS];
} GPEXHost;
#endif /* HW_GPEX_H */