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qemu-irix/hw/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 "hw.h"
#include "sysemu.h"
#include "boards.h"
#include "monitor.h"
#include "loader.h"
#include "elf.h"
#include "hw/sysbus.h"
#include "kvm.h"
#include "device_tree.h"
#include "kvm_ppc.h"
#include "hw/spapr.h"
#include "hw/spapr_vio.h"
#include "hw/xics.h"
#ifdef CONFIG_FDT
#include <libfdt.h>
#endif /* CONFIG_FDT */
/* #define DEBUG_SPAPR */
/* #define DEBUG_TCE */
#ifdef DEBUG_SPAPR
#define dprintf(fmt, ...) \
do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
#else
#define dprintf(fmt, ...) \
do { } while (0)
#endif
static struct BusInfo spapr_vio_bus_info = {
.name = "spapr-vio",
.size = sizeof(VIOsPAPRBus),
.props = (Property[]) {
DEFINE_PROP_UINT32("irq", VIOsPAPRDevice, vio_irq_num, 0), \
DEFINE_PROP_END_OF_LIST(),
},
};
VIOsPAPRDevice *spapr_vio_find_by_reg(VIOsPAPRBus *bus, uint32_t reg)
{
DeviceState *qdev;
VIOsPAPRDevice *dev = NULL;
QTAILQ_FOREACH(qdev, &bus->bus.children, sibling) {
dev = (VIOsPAPRDevice *)qdev;
if (dev->reg == reg) {
return dev;
}
}
return NULL;
}
static char *vio_format_dev_name(VIOsPAPRDevice *dev)
{
VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
char *name;
/* Device tree style name device@reg */
if (asprintf(&name, "%s@%x", pc->dt_name, dev->reg) < 0) {
return NULL;
}
return name;
}
#ifdef CONFIG_FDT
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 = vio_format_dev_name(dev);
if (!dt_name) {
return -ENOMEM;
}
node_off = fdt_add_subnode(fdt, vdevice_off, dt_name);
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->qirq) {
uint32_t ints_prop[] = {cpu_to_be32(dev->vio_irq_num), 0};
ret = fdt_setprop(fdt, node_off, "interrupts", ints_prop,
sizeof(ints_prop));
if (ret < 0) {
return ret;
}
}
if (dev->rtce_window_size) {
uint32_t dma_prop[] = {cpu_to_be32(dev->reg),
0, 0,
0, cpu_to_be32(dev->rtce_window_size)};
ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2);
if (ret < 0) {
return ret;
}
ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2);
if (ret < 0) {
return ret;
}
ret = fdt_setprop(fdt, node_off, "ibm,my-dma-window", dma_prop,
sizeof(dma_prop));
if (ret < 0) {
return ret;
}
}
if (pc->devnode) {
ret = (pc->devnode)(dev, fdt, node_off);
if (ret < 0) {
return ret;
}
}
return node_off;
}
#endif /* CONFIG_FDT */
/*
* RTCE handling
*/
static void rtce_init(VIOsPAPRDevice *dev)
{
size_t size = (dev->rtce_window_size >> SPAPR_VIO_TCE_PAGE_SHIFT)
* sizeof(VIOsPAPR_RTCE);
if (size) {
dev->rtce_table = kvmppc_create_spapr_tce(dev->reg,
dev->rtce_window_size,
&dev->kvmtce_fd);
if (!dev->rtce_table) {
dev->rtce_table = g_malloc0(size);
}
}
}
static target_ulong h_put_tce(CPUPPCState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong liobn = args[0];
target_ulong ioba = args[1];
target_ulong tce = args[2];
VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, liobn);
VIOsPAPR_RTCE *rtce;
if (!dev) {
hcall_dprintf("LIOBN 0x" TARGET_FMT_lx " does not exist\n", liobn);
return H_PARAMETER;
}
ioba &= ~(SPAPR_VIO_TCE_PAGE_SIZE - 1);
#ifdef DEBUG_TCE
fprintf(stderr, "spapr_vio_put_tce on %s ioba 0x" TARGET_FMT_lx
" TCE 0x" TARGET_FMT_lx "\n", dev->qdev.id, ioba, tce);
#endif
if (ioba >= dev->rtce_window_size) {
hcall_dprintf("Out-of-bounds IOBA 0x" TARGET_FMT_lx "\n", ioba);
return H_PARAMETER;
}
rtce = dev->rtce_table + (ioba >> SPAPR_VIO_TCE_PAGE_SHIFT);
rtce->tce = tce;
return H_SUCCESS;
}
int spapr_vio_check_tces(VIOsPAPRDevice *dev, target_ulong ioba,
target_ulong len, enum VIOsPAPR_TCEAccess access)
{
int start, end, i;
start = ioba >> SPAPR_VIO_TCE_PAGE_SHIFT;
end = (ioba + len - 1) >> SPAPR_VIO_TCE_PAGE_SHIFT;
for (i = start; i <= end; i++) {
if ((dev->rtce_table[i].tce & access) != access) {
#ifdef DEBUG_TCE
fprintf(stderr, "FAIL on %d\n", i);
#endif
return -1;
}
}
return 0;
}
int spapr_tce_dma_write(VIOsPAPRDevice *dev, uint64_t taddr, const void *buf,
uint32_t size)
{
#ifdef DEBUG_TCE
fprintf(stderr, "spapr_tce_dma_write taddr=0x%llx size=0x%x\n",
(unsigned long long)taddr, size);
#endif
/* Check for bypass */
if (dev->flags & VIO_PAPR_FLAG_DMA_BYPASS) {
cpu_physical_memory_write(taddr, buf, size);
return 0;
}
while (size) {
uint64_t tce;
uint32_t lsize;
uint64_t txaddr;
/* Check if we are in bound */
if (taddr >= dev->rtce_window_size) {
#ifdef DEBUG_TCE
fprintf(stderr, "spapr_tce_dma_write out of bounds\n");
#endif
return H_DEST_PARM;
}
tce = dev->rtce_table[taddr >> SPAPR_VIO_TCE_PAGE_SHIFT].tce;
/* How much til end of page ? */
lsize = MIN(size, ((~taddr) & SPAPR_VIO_TCE_PAGE_MASK) + 1);
/* Check TCE */
if (!(tce & 2)) {
return H_DEST_PARM;
}
/* Translate */
txaddr = (tce & ~SPAPR_VIO_TCE_PAGE_MASK) |
(taddr & SPAPR_VIO_TCE_PAGE_MASK);
#ifdef DEBUG_TCE
fprintf(stderr, " -> write to txaddr=0x%llx, size=0x%x\n",
(unsigned long long)txaddr, lsize);
#endif
/* Do it */
cpu_physical_memory_write(txaddr, buf, lsize);
buf += lsize;
taddr += lsize;
size -= lsize;
}
return 0;
}
int spapr_tce_dma_zero(VIOsPAPRDevice *dev, uint64_t taddr, uint32_t size)
{
/* FIXME: allocating a temp buffer is nasty, but just stepping
* through writing zeroes is awkward. This will do for now. */
uint8_t zeroes[size];
#ifdef DEBUG_TCE
fprintf(stderr, "spapr_tce_dma_zero taddr=0x%llx size=0x%x\n",
(unsigned long long)taddr, size);
#endif
memset(zeroes, 0, size);
return spapr_tce_dma_write(dev, taddr, zeroes, size);
}
void stb_tce(VIOsPAPRDevice *dev, uint64_t taddr, uint8_t val)
{
spapr_tce_dma_write(dev, taddr, &val, sizeof(val));
}
void sth_tce(VIOsPAPRDevice *dev, uint64_t taddr, uint16_t val)
{
val = tswap16(val);
spapr_tce_dma_write(dev, taddr, &val, sizeof(val));
}
void stw_tce(VIOsPAPRDevice *dev, uint64_t taddr, uint32_t val)
{
val = tswap32(val);
spapr_tce_dma_write(dev, taddr, &val, sizeof(val));
}
void stq_tce(VIOsPAPRDevice *dev, uint64_t taddr, uint64_t val)
{
val = tswap64(val);
spapr_tce_dma_write(dev, taddr, &val, sizeof(val));
}
int spapr_tce_dma_read(VIOsPAPRDevice *dev, uint64_t taddr, void *buf,
uint32_t size)
{
#ifdef DEBUG_TCE
fprintf(stderr, "spapr_tce_dma_write taddr=0x%llx size=0x%x\n",
(unsigned long long)taddr, size);
#endif
/* Check for bypass */
if (dev->flags & VIO_PAPR_FLAG_DMA_BYPASS) {
cpu_physical_memory_read(taddr, buf, size);
return 0;
}
while (size) {
uint64_t tce;
uint32_t lsize;
uint64_t txaddr;
/* Check if we are in bound */
if (taddr >= dev->rtce_window_size) {
#ifdef DEBUG_TCE
fprintf(stderr, "spapr_tce_dma_read out of bounds\n");
#endif
return H_DEST_PARM;
}
tce = dev->rtce_table[taddr >> SPAPR_VIO_TCE_PAGE_SHIFT].tce;
/* How much til end of page ? */
lsize = MIN(size, ((~taddr) & SPAPR_VIO_TCE_PAGE_MASK) + 1);
/* Check TCE */
if (!(tce & 1)) {
return H_DEST_PARM;
}
/* Translate */
txaddr = (tce & ~SPAPR_VIO_TCE_PAGE_MASK) |
(taddr & SPAPR_VIO_TCE_PAGE_MASK);
#ifdef DEBUG_TCE
fprintf(stderr, " -> write to txaddr=0x%llx, size=0x%x\n",
(unsigned long long)txaddr, lsize);
#endif
/* Do it */
cpu_physical_memory_read(txaddr, buf, lsize);
buf += lsize;
taddr += lsize;
size -= lsize;
}
return H_SUCCESS;
}
uint64_t ldq_tce(VIOsPAPRDevice *dev, uint64_t taddr)
{
uint64_t val;
spapr_tce_dma_read(dev, taddr, &val, sizeof(val));
return tswap64(val);
}
/*
* CRQ handling
*/
static target_ulong h_reg_crq(CPUPPCState *env, sPAPREnvironment *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;
dprintf("CRQ for dev 0x" TARGET_FMT_lx " registered at 0x"
TARGET_FMT_lx "/0x" TARGET_FMT_lx "\n",
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;
dprintf("CRQ for dev 0x%" PRIx32 " freed\n", dev->reg);
return H_SUCCESS;
}
static target_ulong h_free_crq(CPUPPCState *env, sPAPREnvironment *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(CPUPPCState *env, sPAPREnvironment *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(CPUPPCState *env, sPAPREnvironment *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) {
fprintf(stderr, "spapr_vio_send_creq on uninitialized queue\n");
return -1;
}
/* Maybe do a fast path for KVM just writing to the pages */
rc = spapr_tce_dma_read(dev, dev->crq.qladdr + dev->crq.qnext, &byte, 1);
if (rc) {
return rc;
}
if (byte != 0) {
return 1;
}
rc = spapr_tce_dma_write(dev, dev->crq.qladdr + dev->crq.qnext + 8,
&crq[8], 8);
if (rc) {
return rc;
}
kvmppc_eieio();
rc = spapr_tce_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(dev->qirq);
}
return 0;
}
/* "quiesce" handling */
static void spapr_vio_quiesce_one(VIOsPAPRDevice *dev)
{
dev->flags &= ~VIO_PAPR_FLAG_DMA_BYPASS;
if (dev->rtce_table) {
size_t size = (dev->rtce_window_size >> SPAPR_VIO_TCE_PAGE_SHIFT)
* sizeof(VIOsPAPR_RTCE);
memset(dev->rtce_table, 0, size);
}
dev->crq.qladdr = 0;
dev->crq.qsize = 0;
dev->crq.qnext = 0;
}
static void rtas_set_tce_bypass(sPAPREnvironment *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, -3);
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, -3);
return;
}
if (enable) {
dev->flags |= VIO_PAPR_FLAG_DMA_BYPASS;
} else {
dev->flags &= ~VIO_PAPR_FLAG_DMA_BYPASS;
}
rtas_st(rets, 0, 0);
}
static void rtas_quiesce(sPAPREnvironment *spapr, uint32_t token,
uint32_t nargs, target_ulong args,
uint32_t nret, target_ulong rets)
{
VIOsPAPRBus *bus = spapr->vio_bus;
DeviceState *qdev;
VIOsPAPRDevice *dev = NULL;
if (nargs != 0) {
rtas_st(rets, 0, -3);
return;
}
QTAILQ_FOREACH(qdev, &bus->bus.children, sibling) {
dev = (VIOsPAPRDevice *)qdev;
spapr_vio_quiesce_one(dev);
}
rtas_st(rets, 0, 0);
}
static int spapr_vio_check_reg(VIOsPAPRDevice *sdev)
{
VIOsPAPRDevice *other_sdev;
DeviceState *qdev;
VIOsPAPRBus *sbus;
sbus = DO_UPCAST(VIOsPAPRBus, bus, sdev->qdev.parent_bus);
/*
* Check two device aren't given clashing addresses by the user (or some
* other mechanism). We have to open code this because we have to check
* for matches with devices other than us.
*/
QTAILQ_FOREACH(qdev, &sbus->bus.children, sibling) {
other_sdev = DO_UPCAST(VIOsPAPRDevice, qdev, qdev);
if (other_sdev != sdev && other_sdev->reg == sdev->reg) {
fprintf(stderr, "vio: %s and %s devices conflict at address %#x\n",
object_get_typename(OBJECT(sdev)),
object_get_typename(OBJECT(qdev)),
sdev->reg);
return -EEXIST;
}
}
return 0;
}
static void spapr_vio_busdev_reset(DeviceState *qdev)
{
VIOsPAPRDevice *dev = DO_UPCAST(VIOsPAPRDevice, qdev, qdev);
VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
if (dev->crq.qsize) {
free_crq(dev);
}
if (pc->reset) {
pc->reset(dev);
}
}
static int spapr_vio_busdev_init(DeviceState *qdev)
{
VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev;
VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
char *id;
int ret;
ret = spapr_vio_check_reg(dev);
if (ret) {
return ret;
}
/* Don't overwrite ids assigned on the command line */
if (!dev->qdev.id) {
id = vio_format_dev_name(dev);
if (!id) {
return -1;
}
dev->qdev.id = id;
}
dev->qirq = spapr_allocate_msi(dev->vio_irq_num, &dev->vio_irq_num);
if (!dev->qirq) {
return -1;
}
rtce_init(dev);
return pc->init(dev);
}
static target_ulong h_vio_signal(CPUPPCState *env, sPAPREnvironment *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, "spapr-vio-bridge");
qdev_init_nofail(dev);
/* Create bus on bridge device */
qbus = qbus_create(&spapr_vio_bus_info, dev, "spapr-vio");
bus = DO_UPCAST(VIOsPAPRBus, bus, qbus);
/* hcall-vio */
spapr_register_hypercall(H_VIO_SIGNAL, h_vio_signal);
/* hcall-tce */
spapr_register_hypercall(H_PUT_TCE, h_put_tce);
/* 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("ibm,set-tce-bypass", rtas_set_tce_bypass);
spapr_rtas_register("quiesce", rtas_quiesce);
return bus;
}
/* Represents sPAPR hcall VIO devices */
static int spapr_vio_bridge_init(SysBusDevice *dev)
{
/* nothing */
return 0;
}
static void spapr_vio_bridge_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
k->init = spapr_vio_bridge_init;
dc->no_user = 1;
}
static TypeInfo spapr_vio_bridge_info = {
.name = "spapr-vio-bridge",
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(SysBusDevice),
.class_init = spapr_vio_bridge_class_init,
};
static void vio_spapr_device_class_init(ObjectClass *klass, void *data)
{
DeviceClass *k = DEVICE_CLASS(klass);
k->init = spapr_vio_busdev_init;
k->reset = spapr_vio_busdev_reset;
k->bus_info = &spapr_vio_bus_info;
}
static 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_bridge_info);
type_register_static(&spapr_vio_type_info);
}
type_init(spapr_vio_register_types)
#ifdef CONFIG_FDT
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;
}
int spapr_populate_vdevice(VIOsPAPRBus *bus, void *fdt)
{
DeviceState *qdev, **qdevs;
int i, num, ret = 0;
/* Count qdevs on the bus list */
num = 0;
QTAILQ_FOREACH(qdev, &bus->bus.children, sibling) {
num++;
}
/* Copy out into an array of pointers */
qdevs = g_malloc(sizeof(qdev) * num);
num = 0;
QTAILQ_FOREACH(qdev, &bus->bus.children, sibling) {
qdevs[num++] = qdev;
}
/* 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]);
ret = vio_make_devnode(dev, fdt);
if (ret < 0) {
goto out;
}
}
ret = 0;
out:
free(qdevs);
return ret;
}
int spapr_populate_chosen_stdout(void *fdt, VIOsPAPRBus *bus)
{
VIOsPAPRDevice *dev;
char *name, *path;
int ret, offset;
dev = spapr_vty_get_default(bus);
if (!dev)
return 0;
offset = fdt_path_offset(fdt, "/chosen");
if (offset < 0) {
return offset;
}
name = vio_format_dev_name(dev);
if (!name) {
return -ENOMEM;
}
if (asprintf(&path, "/vdevice/%s", name) < 0) {
path = NULL;
ret = -ENOMEM;
goto out;
}
ret = fdt_setprop_string(fdt, offset, "linux,stdout-path", path);
out:
free(name);
free(path);
return ret;
}
#endif /* CONFIG_FDT */
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