hw/pcie: Introduce a base class for PCI Express Root Ports

The 'base' PCI Express Root Port includes
the common code to be re-used for all
Root Ports implementations. Most of the code
was taken from the current implementation
of Intel's IOH 3420 Root Port.

Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

default-configs/arm-softmmu.mak

@@ -108,6 +108,7 @@ CONFIG_FSL_IMX25=y
 
 CONFIG_IMX_I2C=y
 
+CONFIG_PCIE_PORT=y
 CONFIG_XIO3130=y
 CONFIG_IOH3420=y
 CONFIG_I82801B11=y

default-configs/i386-softmmu.mak

@@ -51,6 +51,7 @@ CONFIG_PVPANIC=y
 CONFIG_MEM_HOTPLUG=y
 CONFIG_NVDIMM=y
 CONFIG_ACPI_NVDIMM=y
+CONFIG_PCIE_PORT=y
 CONFIG_XIO3130=y
 CONFIG_IOH3420=y
 CONFIG_I82801B11=y

default-configs/x86_64-softmmu.mak

@@ -51,6 +51,7 @@ CONFIG_PVPANIC=y
 CONFIG_MEM_HOTPLUG=y
 CONFIG_NVDIMM=y
 CONFIG_ACPI_NVDIMM=y
+CONFIG_PCIE_PORT=y
 CONFIG_XIO3130=y
 CONFIG_IOH3420=y
 CONFIG_I82801B11=y

hw/pci-bridge/Makefile.objs

@@ -1,5 +1,6 @@
 common-obj-y += pci_bridge_dev.o
 common-obj-y += pci_expander_bridge.o
+common-obj-$(CONFIG_PCIE_PORT) += pcie_root_port.o
 common-obj-$(CONFIG_XIO3130) += xio3130_upstream.o xio3130_downstream.o
 common-obj-$(CONFIG_IOH3420) += ioh3420.o
 common-obj-$(CONFIG_I82801B11) += i82801b11.o

hw/pci-bridge/pcie_root_port.c

@@ -0,0 +1,171 @@
+/*
+ * Base class for PCI Express Root Ports
+ *
+ * Copyright (C) 2017 Red Hat Inc
+ *
+ * Authors:
+ *   Marcel Apfelbaum <marcel@redhat.com>
+ *
+ * Most of the code was migrated from hw/pci-bridge/ioh3420.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/pci/pcie_port.h"
+
+static void rp_aer_vector_update(PCIDevice *d)
+{
+    PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(d);
+
+    if (rpc->aer_vector) {
+        pcie_aer_root_set_vector(d, rpc->aer_vector(d));
+    }
+}
+
+static void rp_write_config(PCIDevice *d, uint32_t address,
+                            uint32_t val, int len)
+{
+    uint32_t root_cmd =
+        pci_get_long(d->config + d->exp.aer_cap + PCI_ERR_ROOT_COMMAND);
+
+    pci_bridge_write_config(d, address, val, len);
+    rp_aer_vector_update(d);
+    pcie_cap_slot_write_config(d, address, val, len);
+    pcie_aer_write_config(d, address, val, len);
+    pcie_aer_root_write_config(d, address, val, len, root_cmd);
+}
+
+static void rp_reset(DeviceState *qdev)
+{
+    PCIDevice *d = PCI_DEVICE(qdev);
+
+    rp_aer_vector_update(d);
+    pcie_cap_root_reset(d);
+    pcie_cap_deverr_reset(d);
+    pcie_cap_slot_reset(d);
+    pcie_cap_arifwd_reset(d);
+    pcie_aer_root_reset(d);
+    pci_bridge_reset(qdev);
+    pci_bridge_disable_base_limit(d);
+}
+
+static void rp_realize(PCIDevice *d, Error **errp)
+{
+    PCIEPort *p = PCIE_PORT(d);
+    PCIESlot *s = PCIE_SLOT(d);
+    PCIDeviceClass *dc = PCI_DEVICE_GET_CLASS(d);
+    PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(d);
+    int rc;
+    Error *local_err = NULL;
+
+    pci_config_set_interrupt_pin(d->config, 1);
+    pci_bridge_initfn(d, TYPE_PCIE_BUS);
+    pcie_port_init_reg(d);
+
+    rc = pci_bridge_ssvid_init(d, rpc->ssvid_offset, dc->vendor_id, rpc->ssid);
+    if (rc < 0) {
+        error_setg(errp, "Can't init SSV ID, error %d", rc);
+        goto err_bridge;
+    }
+
+    if (rpc->interrupts_init) {
+        rc = rpc->interrupts_init(d, &local_err);
+        if (rc < 0) {
+            error_propagate(errp, local_err);
+            goto err_bridge;
+        }
+    }
+
+    rc = pcie_cap_init(d, rpc->exp_offset, PCI_EXP_TYPE_ROOT_PORT, p->port);
+    if (rc < 0) {
+        error_setg(errp, "Can't add Root Port capability, error %d", rc);
+        goto err_int;
+    }
+
+    pcie_cap_arifwd_init(d);
+    pcie_cap_deverr_init(d);
+    pcie_cap_slot_init(d, s->slot);
+    pcie_cap_root_init(d);
+
+    pcie_chassis_create(s->chassis);
+    rc = pcie_chassis_add_slot(s);
+    if (rc < 0) {
+        error_setg(errp, "Can't add chassis slot, error %d", rc);
+        goto err_pcie_cap;
+    }
+
+    rc = pcie_aer_init(d, PCI_ERR_VER, rpc->aer_offset,
+                       PCI_ERR_SIZEOF, &local_err);
+    if (rc < 0) {
+        error_propagate(errp, local_err);
+        goto err;
+    }
+    pcie_aer_root_init(d);
+    rp_aer_vector_update(d);
+
+    return;
+
+err:
+    pcie_chassis_del_slot(s);
+err_pcie_cap:
+    pcie_cap_exit(d);
+err_int:
+    if (rpc->interrupts_uninit) {
+        rpc->interrupts_uninit(d);
+    }
+err_bridge:
+    pci_bridge_exitfn(d);
+}
+
+static void rp_exit(PCIDevice *d)
+{
+    PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(d);
+    PCIESlot *s = PCIE_SLOT(d);
+
+    pcie_aer_exit(d);
+    pcie_chassis_del_slot(s);
+    pcie_cap_exit(d);
+    if (rpc->interrupts_uninit) {
+        rpc->interrupts_uninit(d);
+    }
+    pci_bridge_exitfn(d);
+}
+
+static Property rp_props[] = {
+    DEFINE_PROP_BIT(COMPAT_PROP_PCP, PCIDevice, cap_present,
+                    QEMU_PCIE_SLTCAP_PCP_BITNR, true),
+    DEFINE_PROP_END_OF_LIST()
+};
+
+static void rp_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+    k->is_express = 1;
+    k->is_bridge = 1;
+    k->config_write = rp_write_config;
+    k->realize = rp_realize;
+    k->exit = rp_exit;
+    set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
+    dc->reset = rp_reset;
+    dc->props = rp_props;
+}
+
+static const TypeInfo rp_info = {
+    .name          = TYPE_PCIE_ROOT_PORT,
+    .parent        = TYPE_PCIE_SLOT,
+    .class_init    = rp_class_init,
+    .abstract      = true,
+    .class_size = sizeof(PCIERootPortClass),
+};
+
+static void rp_register_types(void)
+{
+    type_register_static(&rp_info);
+}
+
+type_init(rp_register_types)

include/hw/pci/pcie_port.h

@@ -57,4 +57,23 @@ PCIESlot *pcie_chassis_find_slot(uint8_t chassis, uint16_t slot);
 int pcie_chassis_add_slot(struct PCIESlot *slot);
 void pcie_chassis_del_slot(PCIESlot *s);
 
+#define TYPE_PCIE_ROOT_PORT         "pcie-root-port-base"
+#define PCIE_ROOT_PORT_CLASS(klass) \
+     OBJECT_CLASS_CHECK(PCIERootPortClass, (klass), TYPE_PCIE_ROOT_PORT)
+#define PCIE_ROOT_PORT_GET_CLASS(obj) \
+     OBJECT_GET_CLASS(PCIERootPortClass, (obj), TYPE_PCIE_ROOT_PORT)
+
+typedef struct PCIERootPortClass {
+    PCIDeviceClass parent_class;
+
+    uint8_t (*aer_vector)(const PCIDevice *dev);
+    int (*interrupts_init)(PCIDevice *dev, Error **errp);
+    void (*interrupts_uninit)(PCIDevice *dev);
+
+    int exp_offset;
+    int aer_offset;
+    int ssvid_offset;
+    int ssid;
+} PCIERootPortClass;
+
 #endif /* QEMU_PCIE_PORT_H */