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qemu/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 "hw/hw.h"
#include "sysemu/sysemu.h"
#include "hw/boards.h"
#include "monitor/monitor.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 "hw/ppc/spapr.h"
#include "hw/ppc/spapr_vio.h"
#include "hw/ppc/xics.h"
#include <libfdt.h>
/* #define DEBUG_SPAPR */
#ifdef DEBUG_SPAPR
#define DPRINTF(fmt, ...) \
do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) \
do { } while (0)
#endif
static Property spapr_vio_props[] = {
DEFINE_PROP_UINT32("irq", VIOsPAPRDevice, irq, 0), \
DEFINE_PROP_END_OF_LIST(),
};
static char *spapr_vio_get_dev_name(DeviceState *qdev)
{
VIOsPAPRDevice *dev = VIO_SPAPR_DEVICE(qdev);
VIOsPAPRDeviceClass *pc = VIO_SPAPR_DEVICE_GET_CLASS(dev);
char *name;
/* Device tree style name device@reg */
name = g_strdup_printf("%s@%x", pc->dt_name, dev->reg);
return name;
}
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;
}
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) {
uint32_t ints_prop[] = {cpu_to_be32(dev->irq), 0};
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, 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(PowerPCCPU *cpu, 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(PowerPCCPU *cpu, 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(PowerPCCPU *cpu, 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_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);
}
static void rtas_set_tce_bypass(PowerPCCPU *cpu, 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 (!dev->tcet) {
rtas_st(rets, 0, -3);
return;
}
spapr_tce_set_bypass(dev->tcet, !!enable);
rtas_st(rets, 0, 0);
}
static void rtas_quiesce(PowerPCCPU *cpu, sPAPREnvironment *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, -3);
return;
}
QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
dev = (VIOsPAPRDevice *)kid->child;
spapr_vio_quiesce_one(dev);
}
rtas_st(rets, 0, 0);
}
static VIOsPAPRDevice *reg_conflict(VIOsPAPRDevice *dev)
{
VIOsPAPRBus *bus = DO_UPCAST(VIOsPAPRBus, 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;
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;
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) {
fprintf(stderr, "vio: %s and %s devices conflict at address %#x\n",
object_get_typename(OBJECT(qdev)),
object_get_typename(OBJECT(&other->qdev)),
dev->reg);
return -1;
}
} else {
/* Need to assign an address */
VIOsPAPRBus *bus = DO_UPCAST(VIOsPAPRBus, 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_allocate_msi(dev->irq);
if (!dev->irq) {
return -1;
}
if (pc->rtce_window_size) {
uint32_t liobn = SPAPR_VIO_BASE_LIOBN | dev->reg;
dev->tcet = spapr_tce_new_table(qdev, liobn, pc->rtce_window_size);
address_space_init(&dev->as, spapr_tce_get_iommu(dev->tcet), qdev->id);
}
return pc->init(dev);
}
static target_ulong h_vio_signal(PowerPCCPU *cpu, 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(TYPE_SPAPR_VIO_BUS, dev, "spapr-vio");
bus = DO_UPCAST(VIOsPAPRBus, bus, qbus);
bus->next_reg = 0x71000000;
/* 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("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 const 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,
};
const VMStateDescription vmstate_spapr_vio = {
.name = "spapr_vio",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField []) {
/* Sanity check */
VMSTATE_UINT32_EQUAL(reg, VIOsPAPRDevice),
VMSTATE_UINT32_EQUAL(irq, VIOsPAPRDevice),
/* General VIO device state */
VMSTATE_UINTTL(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->init = spapr_vio_busdev_init;
k->reset = spapr_vio_busdev_reset;
k->bus_type = TYPE_SPAPR_VIO_BUS;
k->props = spapr_vio_props;
}
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;
}
int spapr_populate_vdevice(VIOsPAPRBus *bus, void *fdt)
{
DeviceState *qdev, **qdevs;
BusChild *kid;
int i, num, ret = 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_malloc(sizeof(qdev) * 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]);
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 = spapr_vio_get_dev_name(DEVICE(dev));
path = g_strdup_printf("/vdevice/%s", name);
ret = fdt_setprop_string(fdt, offset, "linux,stdout-path", path);
g_free(name);
g_free(path);
return ret;
}
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