qemu-e2k/hw/ppc/spapr_vio.c

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/*
* QEMU sPAPR VIO code
*
* Copyright (c) 2010 David Gibson, IBM Corporation <dwg@au1.ibm.com>
* Based on the s390 virtio bus code:
* Copyright (c) 2009 Alexander Graf <agraf@suse.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* 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/>.
*/
#include "qemu/osdep.h"
#include "qemu/error-report.h"
2016-03-14 09:01:28 +01:00
#include "qapi/error.h"
#include "qapi/visitor.h"
#include "hw/hw.h"
#include "qemu/log.h"
#include "sysemu/sysemu.h"
#include "hw/boards.h"
#include "hw/loader.h"
#include "elf.h"
#include "hw/sysbus.h"
#include "sysemu/kvm.h"
#include "sysemu/device_tree.h"
#include "kvm_ppc.h"
#include "sysemu/qtest.h"
#include "hw/ppc/spapr.h"
#include "hw/ppc/spapr_vio.h"
#include "hw/ppc/fdt.h"
#include "trace.h"
#include <libfdt.h>
#define SPAPR_VIO_REG_BASE 0x71000000
static char *spapr_vio_get_dev_name(DeviceState *qdev)
{
VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(qdev);
VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
/* Device tree style name device@reg */
return g_strdup_printf("%s@%x", pc->dt_name, dev->reg);
}
static void spapr_vio_bus_class_init(ObjectClass *klass, void *data)
{
BusClass *k = BUS_CLASS(klass);
k->get_dev_path = spapr_vio_get_dev_name;
k->get_fw_dev_path = spapr_vio_get_dev_name;
}
static const TypeInfo spapr_vio_bus_info = {
.name = TYPE_SPAPR_VIO_BUS,
.parent = TYPE_BUS,
.class_init = spapr_vio_bus_class_init,
.instance_size = sizeof(VIOsPAPRBus),
};
VIOsPAPRDevice *spapr_vio_find_by_reg(VIOsPAPRBus *bus, uint32_t reg)
{
BusChild *kid;
VIOsPAPRDevice *dev = NULL;
QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
dev = (VIOsPAPRDevice *)kid->child;
if (dev->reg == reg) {
return dev;
}
}
return NULL;
}
static int vio_make_devnode(VIOsPAPRDevice *dev,
void *fdt)
{
VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
int vdevice_off, node_off, ret;
char *dt_name;
vdevice_off = fdt_path_offset(fdt, "/vdevice");
if (vdevice_off < 0) {
return vdevice_off;
}
dt_name = spapr_vio_get_dev_name(DEVICE(dev));
node_off = fdt_add_subnode(fdt, vdevice_off, dt_name);
g_free(dt_name);
if (node_off < 0) {
return node_off;
}
ret = fdt_setprop_cell(fdt, node_off, "reg", dev->reg);
if (ret < 0) {
return ret;
}
if (pc->dt_type) {
ret = fdt_setprop_string(fdt, node_off, "device_type",
pc->dt_type);
if (ret < 0) {
return ret;
}
}
if (pc->dt_compatible) {
ret = fdt_setprop_string(fdt, node_off, "compatible",
pc->dt_compatible);
if (ret < 0) {
return ret;
}
}
if (dev->irq) {
spapr: fix LSI interrupt specifiers in the device tree LoPAPR 1.1 B.6.9.1.2 describes the "#interrupt-cells" property of the PowerPC External Interrupt Source Controller node as follows: “#interrupt-cells” Standard property name to define the number of cells in an interrupt- specifier within an interrupt domain. prop-encoded-array: An integer, encoded as with encode-int, that denotes the number of cells required to represent an interrupt specifier in its child nodes. The value of this property for the PowerPC External Interrupt option shall be 2. Thus all interrupt specifiers (as used in the standard “interrupts” property) shall consist of two cells, each containing an integer encoded as with encode-int. The first integer represents the interrupt number the second integer is the trigger code: 0 for edge triggered, 1 for level triggered. This patch fixes the interrupt specifiers in the "interrupt-map" property of the PHB node, that were setting the second cell to 8 (confusion with IRQ_TYPE_LEVEL_LOW ?) instead of 1. VIO devices and RTAS event sources use the same format for interrupt specifiers: while here, we introduce a common helper to handle the encoding details. Signed-off-by: Greg Kurz <groug@kaod.org> Reviewed-by: Cédric Le Goater <clg@kaod.org> Tested-by: Cédric Le Goater <clg@kaod.org> -- v3: - reference public LoPAPR instead of internal PAPR+ in changelog - change helper name to spapr_dt_xics_irq() v2: - drop the erroneous changes to the "interrupts" prop in PCI device nodes - introduce a common helper to encode interrupt specifiers Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2017-12-06 09:13:16 +01:00
uint32_t ints_prop[2];
spapr_dt_irq(ints_prop, dev->irq, false);
ret = fdt_setprop(fdt, node_off, "interrupts", ints_prop,
sizeof(ints_prop));
if (ret < 0) {
return ret;
}
}
ret = spapr_tcet_dma_dt(fdt, node_off, "ibm,my-dma-window", dev->tcet);
if (ret < 0) {
return ret;
}
if (pc->devnode) {
ret = (pc->devnode)(dev, fdt, node_off);
if (ret < 0) {
return ret;
}
}
return node_off;
}
/*
* CRQ handling
*/
static target_ulong h_reg_crq(PowerPCCPU *cpu, sPAPRMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong reg = args[0];
target_ulong queue_addr = args[1];
target_ulong queue_len = args[2];
VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
if (!dev) {
hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
return H_PARAMETER;
}
/* We can't grok a queue size bigger than 256M for now */
if (queue_len < 0x1000 || queue_len > 0x10000000) {
hcall_dprintf("Queue size too small or too big (0x" TARGET_FMT_lx
")\n", queue_len);
return H_PARAMETER;
}
/* Check queue alignment */
if (queue_addr & 0xfff) {
hcall_dprintf("Queue not aligned (0x" TARGET_FMT_lx ")\n", queue_addr);
return H_PARAMETER;
}
/* Check if device supports CRQs */
if (!dev->crq.SendFunc) {
hcall_dprintf("Device does not support CRQ\n");
return H_NOT_FOUND;
}
/* Already a queue ? */
if (dev->crq.qsize) {
hcall_dprintf("CRQ already registered\n");
return H_RESOURCE;
}
dev->crq.qladdr = queue_addr;
dev->crq.qsize = queue_len;
dev->crq.qnext = 0;
trace_spapr_vio_h_reg_crq(reg, queue_addr, queue_len);
return H_SUCCESS;
}
static target_ulong free_crq(VIOsPAPRDevice *dev)
{
dev->crq.qladdr = 0;
dev->crq.qsize = 0;
dev->crq.qnext = 0;
trace_spapr_vio_free_crq(dev->reg);
return H_SUCCESS;
}
static target_ulong h_free_crq(PowerPCCPU *cpu, sPAPRMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong reg = args[0];
VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
if (!dev) {
hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
return H_PARAMETER;
}
return free_crq(dev);
}
static target_ulong h_send_crq(PowerPCCPU *cpu, sPAPRMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong reg = args[0];
target_ulong msg_hi = args[1];
target_ulong msg_lo = args[2];
VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
uint64_t crq_mangle[2];
if (!dev) {
hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
return H_PARAMETER;
}
crq_mangle[0] = cpu_to_be64(msg_hi);
crq_mangle[1] = cpu_to_be64(msg_lo);
if (dev->crq.SendFunc) {
return dev->crq.SendFunc(dev, (uint8_t *)crq_mangle);
}
return H_HARDWARE;
}
static target_ulong h_enable_crq(PowerPCCPU *cpu, sPAPRMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong reg = args[0];
VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
if (!dev) {
hcall_dprintf("Unit 0x" TARGET_FMT_lx " does not exist\n", reg);
return H_PARAMETER;
}
return 0;
}
/* Returns negative error, 0 success, or positive: queue full */
int spapr_vio_send_crq(VIOsPAPRDevice *dev, uint8_t *crq)
{
int rc;
uint8_t byte;
if (!dev->crq.qsize) {
error_report("spapr_vio_send_creq on uninitialized queue");
return -1;
}
/* Maybe do a fast path for KVM just writing to the pages */
rc = spapr_vio_dma_read(dev, dev->crq.qladdr + dev->crq.qnext, &byte, 1);
if (rc) {
return rc;
}
if (byte != 0) {
return 1;
}
rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext + 8,
&crq[8], 8);
if (rc) {
return rc;
}
kvmppc_eieio();
rc = spapr_vio_dma_write(dev, dev->crq.qladdr + dev->crq.qnext, crq, 8);
if (rc) {
return rc;
}
dev->crq.qnext = (dev->crq.qnext + 16) % dev->crq.qsize;
if (dev->signal_state & 1) {
qemu_irq_pulse(spapr_vio_qirq(dev));
}
return 0;
}
/* "quiesce" handling */
static void spapr_vio_quiesce_one(VIOsPAPRDevice *dev)
{
if (dev->tcet) {
device_reset(DEVICE(dev->tcet));
}
free_crq(dev);
}
void spapr_vio_set_bypass(VIOsPAPRDevice *dev, bool bypass)
{
if (!dev->tcet) {
return;
}
memory_region_set_enabled(&dev->mrbypass, bypass);
memory_region_set_enabled(spapr_tce_get_iommu(dev->tcet), !bypass);
dev->tcet->bypass = bypass;
}
static void rtas_set_tce_bypass(PowerPCCPU *cpu, sPAPRMachineState *spapr,
uint32_t token,
uint32_t nargs, target_ulong args,
uint32_t nret, target_ulong rets)
{
VIOsPAPRBus *bus = spapr->vio_bus;
VIOsPAPRDevice *dev;
uint32_t unit, enable;
if (nargs != 2) {
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return;
}
unit = rtas_ld(args, 0);
enable = rtas_ld(args, 1);
dev = spapr_vio_find_by_reg(bus, unit);
if (!dev) {
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return;
}
if (!dev->tcet) {
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return;
}
spapr_vio_set_bypass(dev, !!enable);
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
}
static void rtas_quiesce(PowerPCCPU *cpu, sPAPRMachineState *spapr,
uint32_t token,
uint32_t nargs, target_ulong args,
uint32_t nret, target_ulong rets)
{
VIOsPAPRBus *bus = spapr->vio_bus;
BusChild *kid;
VIOsPAPRDevice *dev = NULL;
if (nargs != 0) {
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return;
}
QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
dev = (VIOsPAPRDevice *)kid->child;
spapr_vio_quiesce_one(dev);
}
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
}
static VIOsPAPRDevice *reg_conflict(VIOsPAPRDevice *dev)
{
VIOsPAPRBus *bus = SPAPR_VIO_BUS(dev->qdev.parent_bus);
BusChild *kid;
VIOsPAPRDevice *other;
/*
* Check for a device other than the given one which is already
* using the requested address. We have to open code this because
* the given dev might already be in the list.
*/
QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
other = VIO_SPAPR_DEVICE(kid->child);
if (other != dev && other->reg == dev->reg) {
return other;
}
}
return 0;
}
static void spapr_vio_busdev_reset(DeviceState *qdev)
{
VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(qdev);
VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
/* Shut down the request queue and TCEs if necessary */
spapr_vio_quiesce_one(dev);
dev->signal_state = 0;
spapr_vio_set_bypass(dev, false);
if (pc->reset) {
pc->reset(dev);
}
}
/*
* The register property of a VIO device is defined in livirt using
* 0x1000 as a base register number plus a 0x1000 increment. For the
* VIO tty device, the base number is changed to 0x30000000. QEMU uses
* a base register number of 0x71000000 and then a simple increment.
*
* The formula below tries to compute a unique index number from the
* register value that will be used to define the IRQ number of the
* VIO device.
*
* A maximum of 256 VIO devices is covered. Collisions are possible
* but they will be detected when the IRQ is claimed.
*/
static inline uint32_t spapr_vio_reg_to_irq(uint32_t reg)
{
uint32_t irq;
if (reg >= SPAPR_VIO_REG_BASE) {
/*
* VIO device register values when allocated by QEMU. For
* these, we simply mask the high bits to fit the overall
* range: [0x00 - 0xff].
*
* The nvram VIO device (reg=0x71000000) is a static device of
* the pseries machine and so is always allocated by QEMU. Its
* IRQ number is 0x0.
*/
irq = reg & 0xff;
} else if (reg >= 0x30000000) {
/*
* VIO tty devices register values, when allocated by livirt,
* are mapped in range [0xf0 - 0xff], gives us a maximum of 16
* vtys.
*/
irq = 0xf0 | ((reg >> 12) & 0xf);
} else {
/*
* Other VIO devices register values, when allocated by
* livirt, should be mapped in range [0x00 - 0xef]. Conflicts
* will be detected when IRQ is claimed.
*/
irq = (reg >> 12) & 0xff;
}
return SPAPR_IRQ_VIO | irq;
}
static void spapr_vio_busdev_realize(DeviceState *qdev, Error **errp)
{
sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev;
VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
char *id;
Error *local_err = NULL;
if (dev->reg != -1) {
/*
* Explicitly assigned address, just verify that no-one else
* is using it. other mechanism). We have to open code this
* rather than using spapr_vio_find_by_reg() because sdev
* itself is already in the list.
*/
VIOsPAPRDevice *other = reg_conflict(dev);
if (other) {
error_setg(errp, "%s and %s devices conflict at address %#x",
object_get_typename(OBJECT(qdev)),
object_get_typename(OBJECT(&other->qdev)),
dev->reg);
return;
}
} else {
/* Need to assign an address */
VIOsPAPRBus *bus = SPAPR_VIO_BUS(dev->qdev.parent_bus);
do {
dev->reg = bus->next_reg++;
} while (reg_conflict(dev));
}
/* Don't overwrite ids assigned on the command line */
if (!dev->qdev.id) {
id = spapr_vio_get_dev_name(DEVICE(dev));
dev->qdev.id = id;
}
dev->irq = spapr_vio_reg_to_irq(dev->reg);
if (SPAPR_MACHINE_GET_CLASS(spapr)->legacy_irq_allocation) {
dev->irq = spapr_irq_findone(spapr, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
spapr_irq_claim(spapr, dev->irq, false, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
if (pc->rtce_window_size) {
uint32_t liobn = SPAPR_VIO_LIOBN(dev->reg);
memory_region_init(&dev->mrroot, OBJECT(dev), "iommu-spapr-root",
ram_size);
memory_region_init_alias(&dev->mrbypass, OBJECT(dev),
"iommu-spapr-bypass", get_system_memory(),
0, ram_size);
memory_region_add_subregion_overlap(&dev->mrroot, 0, &dev->mrbypass, 1);
address_space_init(&dev->as, &dev->mrroot, qdev->id);
spapr_iommu: Introduce "enabled" state for TCE table Currently TCE tables are created once at start and their sizes never change. We are going to change that by introducing a Dynamic DMA windows support where DMA configuration may change during the guest execution. This changes spapr_tce_new_table() to create an empty zero-size IOMMU memory region (IOMMU MR). Only LIOBN is assigned by the time of creation. It still will be called once at the owner object (VIO or PHB) creation. This introduces an "enabled" state for TCE table objects, some helper functions are added: - spapr_tce_table_enable() receives TCE table parameters, stores in sPAPRTCETable and allocates a guest view of the TCE table (in the user space or KVM) and sets the correct size on the IOMMU MR; - spapr_tce_table_disable() disposes the table and resets the IOMMU MR size; it is made public as the following DDW code will be using it. This changes the PHB reset handler to do the default DMA initialization instead of spapr_phb_realize(). This does not make differenct now but later with more than just one DMA window, we will have to remove them all and create the default one on a system reset. No visible change in behaviour is expected except the actual table will be reallocated every reset. We might optimize this later. The other way to implement this would be dynamically create/remove the TCE table QOM objects but this would make migration impossible as the migration code expects all QOM objects to exist at the receiver so we have to have TCE table objects created when migration begins. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2016-06-01 10:57:33 +02:00
dev->tcet = spapr_tce_new_table(qdev, liobn);
spapr_tce_table_enable(dev->tcet, SPAPR_TCE_PAGE_SHIFT, 0,
pc->rtce_window_size >> SPAPR_TCE_PAGE_SHIFT);
dev->tcet->vdev = dev;
memory_region_add_subregion_overlap(&dev->mrroot, 0,
spapr_tce_get_iommu(dev->tcet), 2);
}
pc->realize(dev, errp);
}
static target_ulong h_vio_signal(PowerPCCPU *cpu, sPAPRMachineState *spapr,
target_ulong opcode,
target_ulong *args)
{
target_ulong reg = args[0];
target_ulong mode = args[1];
VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
VIOsPAPRDeviceClass *pc;
if (!dev) {
return H_PARAMETER;
}
pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
if (mode & ~pc->signal_mask) {
return H_PARAMETER;
}
dev->signal_state = mode;
return H_SUCCESS;
}
VIOsPAPRBus *spapr_vio_bus_init(void)
{
VIOsPAPRBus *bus;
BusState *qbus;
DeviceState *dev;
/* Create bridge device */
dev = qdev_create(NULL, TYPE_SPAPR_VIO_BRIDGE);
qdev_init_nofail(dev);
/* Create bus on bridge device */
qbus = qbus_create(TYPE_SPAPR_VIO_BUS, dev, "spapr-vio");
bus = SPAPR_VIO_BUS(qbus);
bus->next_reg = SPAPR_VIO_REG_BASE;
/* hcall-vio */
spapr_register_hypercall(H_VIO_SIGNAL, h_vio_signal);
/* hcall-crq */
spapr_register_hypercall(H_REG_CRQ, h_reg_crq);
spapr_register_hypercall(H_FREE_CRQ, h_free_crq);
spapr_register_hypercall(H_SEND_CRQ, h_send_crq);
spapr_register_hypercall(H_ENABLE_CRQ, h_enable_crq);
/* RTAS calls */
spapr_rtas_register(RTAS_IBM_SET_TCE_BYPASS, "ibm,set-tce-bypass",
rtas_set_tce_bypass);
spapr_rtas_register(RTAS_QUIESCE, "quiesce", rtas_quiesce);
return bus;
}
static void spapr_vio_bridge_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->fw_name = "vdevice";
}
static const TypeInfo spapr_vio_bridge_info = {
.name = TYPE_SPAPR_VIO_BRIDGE,
.parent = TYPE_SYS_BUS_DEVICE,
.class_init = spapr_vio_bridge_class_init,
};
const VMStateDescription vmstate_spapr_vio = {
.name = "spapr_vio",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
/* Sanity check */
VMSTATE_UINT32_EQUAL(reg, VIOsPAPRDevice, NULL),
VMSTATE_UINT32_EQUAL(irq, VIOsPAPRDevice, NULL),
/* General VIO device state */
VMSTATE_UINT64(signal_state, VIOsPAPRDevice),
VMSTATE_UINT64(crq.qladdr, VIOsPAPRDevice),
VMSTATE_UINT32(crq.qsize, VIOsPAPRDevice),
VMSTATE_UINT32(crq.qnext, VIOsPAPRDevice),
VMSTATE_END_OF_LIST()
},
};
static void vio_spapr_device_class_init(ObjectClass *klass, void *data)
{
DeviceClass *k = DEVICE_CLASS(klass);
k->realize = spapr_vio_busdev_realize;
k->reset = spapr_vio_busdev_reset;
k->bus_type = TYPE_SPAPR_VIO_BUS;
}
static const TypeInfo spapr_vio_type_info = {
.name = TYPE_VIO_SPAPR_DEVICE,
.parent = TYPE_DEVICE,
.instance_size = sizeof(VIOsPAPRDevice),
.abstract = true,
.class_size = sizeof(VIOsPAPRDeviceClass),
.class_init = vio_spapr_device_class_init,
};
static void spapr_vio_register_types(void)
{
type_register_static(&spapr_vio_bus_info);
type_register_static(&spapr_vio_bridge_info);
type_register_static(&spapr_vio_type_info);
}
type_init(spapr_vio_register_types)
static int compare_reg(const void *p1, const void *p2)
{
VIOsPAPRDevice const *dev1, *dev2;
dev1 = (VIOsPAPRDevice *)*(DeviceState **)p1;
dev2 = (VIOsPAPRDevice *)*(DeviceState **)p2;
if (dev1->reg < dev2->reg) {
return -1;
}
if (dev1->reg == dev2->reg) {
return 0;
}
/* dev1->reg > dev2->reg */
return 1;
}
void spapr_dt_vdevice(VIOsPAPRBus *bus, void *fdt)
{
DeviceState *qdev, **qdevs;
BusChild *kid;
int i, num, ret = 0;
int node;
_FDT(node = fdt_add_subnode(fdt, 0, "vdevice"));
_FDT(fdt_setprop_string(fdt, node, "device_type", "vdevice"));
_FDT(fdt_setprop_string(fdt, node, "compatible", "IBM,vdevice"));
_FDT(fdt_setprop_cell(fdt, node, "#address-cells", 1));
_FDT(fdt_setprop_cell(fdt, node, "#size-cells", 0));
_FDT(fdt_setprop_cell(fdt, node, "#interrupt-cells", 2));
_FDT(fdt_setprop(fdt, node, "interrupt-controller", NULL, 0));
/* Count qdevs on the bus list */
num = 0;
QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
num++;
}
/* Copy out into an array of pointers */
qdevs = g_new(DeviceState *, num);
num = 0;
QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
qdevs[num++] = kid->child;
}
/* Sort the array */
qsort(qdevs, num, sizeof(qdev), compare_reg);
/* Hack alert. Give the devices to libfdt in reverse order, we happen
* to know that will mean they are in forward order in the tree. */
for (i = num - 1; i >= 0; i--) {
VIOsPAPRDevice *dev = (VIOsPAPRDevice *)(qdevs[i]);
VIOsPAPRDeviceClass *vdc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
ret = vio_make_devnode(dev, fdt);
if (ret < 0) {
error_report("Couldn't create device node /vdevice/%s@%"PRIx32,
vdc->dt_name, dev->reg);
exit(1);
}
}
g_free(qdevs);
}
gchar *spapr_vio_stdout_path(VIOsPAPRBus *bus)
{
VIOsPAPRDevice *dev;
char *name, *path;
dev = spapr_vty_get_default(bus);
if (!dev) {
return NULL;
}
name = spapr_vio_get_dev_name(DEVICE(dev));
path = g_strdup_printf("/vdevice/%s", name);
g_free(name);
return path;
}