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 only supports a single legacy IRQ line so far. 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 <ag...@suse.de> Reviewed-by: Claudio Fontana <claudio.font...@huawei.com> Tested-by: Claudio Fontana <claudio.font...@huawei.com> --- v1 -> v2: - Add documentation links - Remove mmio_window_size - Expose 4 INTX IRQs --- hw/pci-host/Makefile.objs | 1 + hw/pci-host/gpex.c | 153 +++++++++++++++++++++++++++++++++++++++++++++ include/hw/pci-host/gpex.h | 54 ++++++++++++++++ 3 files changed, 208 insertions(+) create mode 100644 hw/pci-host/gpex.c create mode 100644 include/hw/pci-host/gpex.h diff --git a/hw/pci-host/Makefile.objs b/hw/pci-host/Makefile.objs index bb65f9c..45f1f0e 100644 --- a/hw/pci-host/Makefile.objs +++ b/hw/pci-host/Makefile.objs @@ -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 diff --git a/hw/pci-host/gpex.c b/hw/pci-host/gpex.c new file mode 100644 index 0000000..11aaf5b --- /dev/null +++ b/hw/pci-host/gpex.c @@ -0,0 +1,153 @@ +/* + * QEMU Generic PCI Express Bridge Emulation + * + * Copyright (C) 2015 Alexander Graf <ag...@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_MIN); + 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 < 4; 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); + + object_initialize(&s->gpex_root, sizeof(s->gpex_root), TYPE_GPEX_ROOT_DEVICE); + object_property_add_child(OBJECT(s), "gpex_root", OBJECT(&s->gpex_root), NULL); + qdev_prop_set_uint32(DEVICE(&s->gpex_root), "addr", PCI_DEVFN(0, 0)); + qdev_prop_set_bit(DEVICE(&s->gpex_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 = "Host bridge"; + dc->vmsd = &vmstate_gpex_root; + k->vendor_id = PCI_VENDOR_ID_REDHAT; + k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE; + 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); diff --git a/include/hw/pci-host/gpex.h b/include/hw/pci-host/gpex.h new file mode 100644 index 0000000..b465667 --- /dev/null +++ b/include/hw/pci-host/gpex.h @@ -0,0 +1,54 @@ +/* + * gpex.h + * + * Copyright (C) 2015 Alexander Graf <ag...@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) + +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[4]; +} GPEXHost; + +#endif /* HW_GPEX_H */ -- 1.7.12.4
