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qemu/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"
#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),
};
VIOsPAPRDevice *spapr_vio_find_by_reg(VIOsPAPRBus *bus, uint32_t reg)
{
DeviceState *qdev;
VIOsPAPRDevice *dev = NULL;
QLIST_FOREACH(qdev, &bus->bus.children, sibling) {
dev = (VIOsPAPRDevice *)qdev;
if (dev->reg == reg) {
break;
}
}
return dev;
}
#ifdef CONFIG_FDT
static int vio_make_devnode(VIOsPAPRDevice *dev,
void *fdt)
{
VIOsPAPRDeviceInfo *info = (VIOsPAPRDeviceInfo *)dev->qdev.info;
int vdevice_off, node_off;
int ret;
vdevice_off = fdt_path_offset(fdt, "/vdevice");
if (vdevice_off < 0) {
return vdevice_off;
}
node_off = fdt_add_subnode(fdt, vdevice_off, dev->qdev.id);
if (node_off < 0) {
return node_off;
}
ret = fdt_setprop_cell(fdt, node_off, "reg", dev->reg);
if (ret < 0) {
return ret;
}
if (info->dt_type) {
ret = fdt_setprop_string(fdt, node_off, "device_type",
info->dt_type);
if (ret < 0) {
return ret;
}
}
if (info->dt_compatible) {
ret = fdt_setprop_string(fdt, node_off, "compatible",
info->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 (info->devnode) {
ret = (info->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 = qemu_mallocz(size);
}
}
static target_ulong h_put_tce(CPUState *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("spapr_vio_put_tce on non-existent LIOBN "
TARGET_FMT_lx "\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("spapr_vio_put_tce on out-of-boards 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(CPUState *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("h_reg_crq on non-existent unit 0x"
TARGET_FMT_lx "\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("h_reg_crq, queue size too small or too big (0x%llx)\n",
(unsigned long long)queue_len);
return H_PARAMETER;
}
/* Check queue alignment */
if (queue_addr & 0xfff) {
hcall_dprintf("h_reg_crq, queue not aligned (0x%llx)\n",
(unsigned long long)queue_addr);
return H_PARAMETER;
}
/* Check if device supports CRQs */
if (!dev->crq.SendFunc) {
return H_NOT_FOUND;
}
/* Already a queue ? */
if (dev->crq.qsize) {
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 h_free_crq(CPUState *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("h_free_crq on non-existent unit 0x"
TARGET_FMT_lx "\n", reg);
return H_PARAMETER;
}
dev->crq.qladdr = 0;
dev->crq.qsize = 0;
dev->crq.qnext = 0;
dprintf("CRQ for dev 0x" TARGET_FMT_lx " freed\n", reg);
return H_SUCCESS;
}
static target_ulong h_send_crq(CPUState *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("h_send_crq on non-existent unit 0x"
TARGET_FMT_lx "\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(CPUState *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("h_enable_crq on non-existent unit 0x"
TARGET_FMT_lx "\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;
}
QLIST_FOREACH(qdev, &bus->bus.children, sibling) {
dev = (VIOsPAPRDevice *)qdev;
spapr_vio_quiesce_one(dev);
}
rtas_st(rets, 0, 0);
}
static int spapr_vio_busdev_init(DeviceState *qdev, DeviceInfo *qinfo)
{
VIOsPAPRDeviceInfo *info = (VIOsPAPRDeviceInfo *)qinfo;
VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev;
char *id;
if (asprintf(&id, "%s@%x", info->dt_name, dev->reg) < 0) {
return -1;
}
dev->qdev.id = id;
rtce_init(dev);
return info->init(dev);
}
void spapr_vio_bus_register_withprop(VIOsPAPRDeviceInfo *info)
{
info->qdev.init = spapr_vio_busdev_init;
info->qdev.bus_info = &spapr_vio_bus_info;
assert(info->qdev.size >= sizeof(VIOsPAPRDevice));
qdev_register(&info->qdev);
}
static target_ulong h_vio_signal(CPUState *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);
VIOsPAPRDeviceInfo *info;
if (!dev) {
return H_PARAMETER;
}
info = (VIOsPAPRDeviceInfo *)dev->qdev.info;
if (mode & ~info->signal_mask) {
return H_PARAMETER;
}
dev->signal_state = mode;
return H_SUCCESS;
}
VIOsPAPRBus *spapr_vio_bus_init(void)
{
VIOsPAPRBus *bus;
BusState *qbus;
DeviceState *dev;
DeviceInfo *qinfo;
/* 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);
for (qinfo = device_info_list; qinfo; qinfo = qinfo->next) {
VIOsPAPRDeviceInfo *info = (VIOsPAPRDeviceInfo *)qinfo;
if (qinfo->bus_info != &spapr_vio_bus_info) {
continue;
}
if (info->hcalls) {
info->hcalls(bus);
}
}
return bus;
}
/* Represents sPAPR hcall VIO devices */
static int spapr_vio_bridge_init(SysBusDevice *dev)
{
/* nothing */
return 0;
}
static SysBusDeviceInfo spapr_vio_bridge_info = {
.init = spapr_vio_bridge_init,
.qdev.name = "spapr-vio-bridge",
.qdev.size = sizeof(SysBusDevice),
.qdev.no_user = 1,
};
static void spapr_vio_register_devices(void)
{
sysbus_register_withprop(&spapr_vio_bridge_info);
}
device_init(spapr_vio_register_devices)
#ifdef CONFIG_FDT
int spapr_populate_vdevice(VIOsPAPRBus *bus, void *fdt)
{
DeviceState *qdev;
int ret = 0;
QLIST_FOREACH(qdev, &bus->bus.children, sibling) {
VIOsPAPRDevice *dev = (VIOsPAPRDevice *)qdev;
ret = vio_make_devnode(dev, fdt);
if (ret < 0) {
return ret;
}
}
return 0;
}
#endif /* CONFIG_FDT */
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