[Qemu-devel] [RFC v3 1/2] pci/pci-host: Add generic-pci PCI host controller device

[Alvise Rigo <a.rigo@virtualopensystems.com>]

Add a generic PCI host controller for virtual platforms, based on the
previous work by Rob Herring:
http://lists.gnu.org/archive/html/qemu-devel/2014-06/msg03482.html

The controller relies on a configuration memory region and provides two
PCI memory regions for I/O (one port and one memory mapped).  The device
needs the following qdev properties to configure the memory regions:
- cfg_win_size: size of the configuration memory
- pio_win_size: size of the port I/O space
- mmio_win_size: size of the MMIO space
- mmio_win_addr: offset of MMIO space in the system memory

Signed-off-by: Alvise Rigo <a.rigo@virtualopensystems.com>
---
 hw/pci-host/Makefile.objs         |   2 +-
 hw/pci-host/generic-pci.c         | 140 ++++++++++++++++++++++++++++++++++++++
 include/hw/pci-host/generic-pci.h |  45 ++++++++++++
 3 files changed, 186 insertions(+), 1 deletion(-)
 create mode 100644 hw/pci-host/generic-pci.c
 create mode 100644 include/hw/pci-host/generic-pci.h

diff --git a/hw/pci-host/Makefile.objs b/hw/pci-host/Makefile.objs
index bb65f9c..8ef9fac 100644
--- a/hw/pci-host/Makefile.objs
+++ b/hw/pci-host/Makefile.objs
@@ -1,4 +1,4 @@
-common-obj-y += pam.o
+common-obj-y += pam.o generic-pci.o
 
 # PPC devices
 common-obj-$(CONFIG_PREP_PCI) += prep.o
diff --git a/hw/pci-host/generic-pci.c b/hw/pci-host/generic-pci.c
new file mode 100644
index 0000000..54c9647
--- /dev/null
+++ b/hw/pci-host/generic-pci.c
@@ -0,0 +1,140 @@
+/*
+ * Generic PCI host controller
+ *
+ * Copyright (c) 2014 Linaro, Ltd.
+ * Author: Rob Herring <rob.herring@linaro.org>
+ *
+ * Based on ARM Versatile PCI controller (hw/pci-host/versatile.c):
+ * Copyright (c) 2006-2009 CodeSourcery.
+ * Written by Paul Brook
+ *
+ * This code is licensed under the LGPL.
+ */
+
+#include "hw/sysbus.h"
+#include "hw/pci-host/generic-pci.h"
+#include "exec/address-spaces.h"
+#include "sysemu/device_tree.h"
+
+static const VMStateDescription pci_generic_host_vmstate = {
+    .name = "generic-host-pci",
+    .version_id = 1,
+    .minimum_version_id = 1,
+};
+
+static void pci_cam_config_write(void *opaque, hwaddr addr,
+                                 uint64_t val, unsigned size)
+{
+    PCIGenState *s = opaque;
+    pci_data_write(&s->pci_bus, addr, val, size);
+}
+
+static uint64_t pci_cam_config_read(void *opaque, hwaddr addr, unsigned size)
+{
+    PCIGenState *s = opaque;
+    uint32_t val;
+    val = pci_data_read(&s->pci_bus, addr, size);
+    return val;
+}
+
+static const MemoryRegionOps pci_generic_config_ops = {
+    .read = pci_cam_config_read,
+    .write = pci_cam_config_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static void pci_generic_set_irq(void *opaque, int irq_num, int level)
+{
+    qemu_irq *pic = opaque;
+    qemu_set_irq(pic[irq_num], level);
+}
+
+static void pci_generic_host_realize(DeviceState *dev, Error **errp)
+{
+    PCIHostState *h = PCI_HOST_BRIDGE(dev);
+    PCIGenState *s = PCI_GEN(dev);
+    GenericPCIHostState *gps = &s->pci_gen;
+    SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
+    int i;
+
+    memory_region_init(&s->pci_io_window, OBJECT(s), "pci_io", s->pio_win_size);
+    memory_region_init(&s->pci_mem_space, OBJECT(s), "pci_mem", 1ULL << 32);
+
+    pci_bus_new_inplace(&s->pci_bus, sizeof(s->pci_bus), dev, "pci",
+                        &s->pci_mem_space, &s->pci_io_window,
+                        PCI_DEVFN(0, 0), TYPE_PCI_BUS);
+    h->bus = &s->pci_bus;
+
+    object_initialize(gps, sizeof(*gps), TYPE_GENERIC_PCI_HOST);
+    qdev_set_parent_bus(DEVICE(gps), BUS(&s->pci_bus));
+
+    for (i = 0; i < s->irqs; i++) {
+        sysbus_init_irq(sbd, &s->irq[i]);
+    }
+
+    pci_bus_irqs(&s->pci_bus, pci_generic_set_irq, pci_swizzle_map_irq_fn,
+                                                         s->irq, s->irqs);
+    memory_region_init_io(&s->mem_config, OBJECT(s), &pci_generic_config_ops, s,
+                          "pci-config", s->cfg_win_size);
+    memory_region_init_alias(&s->pci_mem_window, OBJECT(s), "pci-mem-win",
+                    &s->pci_mem_space, s->mmio_win_addr, s->mmio_win_size);
+
+    sysbus_init_mmio(sbd, &s->mem_config);
+    sysbus_init_mmio(sbd, &s->pci_io_window);
+    sysbus_init_mmio(sbd, &s->pci_mem_window);
+}
+
+static void pci_generic_host_class_init(ObjectClass *klass, void *data)
+{
+    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    k->vendor_id = PCI_VENDOR_ID_REDHAT;
+    k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE;
+    k->class_id = PCI_CLASS_PROCESSOR_CO;
+    /*
+     * 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 pci_generic_host_info = {
+    .name          = TYPE_GENERIC_PCI_HOST,
+    .parent        = TYPE_PCI_DEVICE,
+    .instance_size = sizeof(GenericPCIHostState),
+    .class_init    = pci_generic_host_class_init,
+};
+
+static Property pci_generic_props[] = {
+    DEFINE_PROP_UINT32("cfg_win_size", PCIGenState, cfg_win_size, 1ULL << 20),
+    DEFINE_PROP_UINT32("pio_win_size", PCIGenState, pio_win_size, 64 * 1024),
+    DEFINE_PROP_UINT64("mmio_win_size", PCIGenState, mmio_win_size, 1ULL << 32),
+    DEFINE_PROP_UINT64("mmio_win_addr", PCIGenState, mmio_win_addr, 0),
+    DEFINE_PROP_UINT32("irqs", PCIGenState, irqs, 4),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void pci_generic_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->realize = pci_generic_host_realize;
+    dc->vmsd = &pci_generic_host_vmstate;
+    dc->props = pci_generic_props;
+}
+
+static const TypeInfo pci_generic_info = {
+    .name          = TYPE_GENERIC_PCI,
+    .parent        = TYPE_PCI_HOST_BRIDGE,
+    .instance_size = sizeof(PCIGenState),
+    .class_init    = pci_generic_class_init,
+};
+
+static void generic_pci_host_register_types(void)
+{
+    type_register_static(&pci_generic_info);
+    type_register_static(&pci_generic_host_info);
+}
+
+type_init(generic_pci_host_register_types)
\ No newline at end of file
diff --git a/include/hw/pci-host/generic-pci.h b/include/hw/pci-host/generic-pci.h
new file mode 100644
index 0000000..830542e
--- /dev/null
+++ b/include/hw/pci-host/generic-pci.h
@@ -0,0 +1,45 @@
+#ifndef QEMU_GENERIC_PCI_H
+#define QEMU_GENERIC_PCI_H
+
+#include "hw/pci/pci.h"
+#include "hw/pci/pci_bus.h"
+#include "hw/pci/pci_host.h"
+
+#define MAX_PCI_DEVICES (PCI_SLOT_MAX * PCI_FUNC_MAX)
+
+typedef struct {
+    /*< private >*/
+    PCIDevice parent_obj;
+} GenericPCIHostState;
+
+typedef struct PCIGenState {
+    /*< private >*/
+    PCIHostState parent_obj;
+
+    qemu_irq irq[MAX_PCI_DEVICES];
+    MemoryRegion mem_config;
+    /* Container representing the PCI address MMIO space */
+    MemoryRegion pci_mem_space;
+    /* Alias region into PCI address spaces which we expose as sysbus region */
+    MemoryRegion pci_mem_window;
+    /* PCI I/O region */
+    MemoryRegion pci_io_window;
+    PCIBus pci_bus;
+    GenericPCIHostState pci_gen;
+
+    uint32_t cfg_win_size;
+    uint32_t pio_win_size;
+    uint64_t mmio_win_addr; // offset of pci_mem_window inside pci_mem_space
+    uint64_t mmio_win_size;
+    uint32_t irqs;
+} PCIGenState;
+
+#define TYPE_GENERIC_PCI "generic_pci"
+#define PCI_GEN(obj) \
+    OBJECT_CHECK(PCIGenState, (obj), TYPE_GENERIC_PCI)
+
+#define TYPE_GENERIC_PCI_HOST "generic_pci_host"
+#define PCI_GEN_HOST(obj) \
+    OBJECT_CHECK(GenericPCIHostState, (obj), TYPE_GENERIC_PCI_HOST)
+
+#endif
\ No newline at end of file
-- 
2.1.0