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qemu-e2k/hw/ppc/spapr_iommu.c

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/*
* QEMU sPAPR IOMMU (TCE) code
*
* Copyright (c) 2010 David Gibson, IBM Corporation <dwg@au1.ibm.com>
*
* 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 "hw/hw.h"
#include "sysemu/kvm.h"
#include "hw/qdev.h"
#include "kvm_ppc.h"
#include "sysemu/dma.h"
#include "exec/address-spaces.h"
#include "trace.h"
#include "hw/ppc/spapr.h"
#include "hw/ppc/spapr_vio.h"
#include <libfdt.h>
enum sPAPRTCEAccess {
SPAPR_TCE_FAULT = 0,
SPAPR_TCE_RO = 1,
SPAPR_TCE_WO = 2,
SPAPR_TCE_RW = 3,
};
#define IOMMU_PAGE_SIZE(shift) (1ULL << (shift))
#define IOMMU_PAGE_MASK(shift) (~(IOMMU_PAGE_SIZE(shift) - 1))
static QLIST_HEAD(spapr_tce_tables, sPAPRTCETable) spapr_tce_tables;
sPAPRTCETable *spapr_tce_find_by_liobn(target_ulong liobn)
{
sPAPRTCETable *tcet;
if (liobn & 0xFFFFFFFF00000000ULL) {
hcall_dprintf("Request for out-of-bounds LIOBN 0x" TARGET_FMT_lx "\n",
liobn);
return NULL;
}
QLIST_FOREACH(tcet, &spapr_tce_tables, list) {
if (tcet->liobn == (uint32_t)liobn) {
return tcet;
}
}
return NULL;
}
static IOMMUAccessFlags spapr_tce_iommu_access_flags(uint64_t tce)
{
switch (tce & SPAPR_TCE_RW) {
case SPAPR_TCE_FAULT:
return IOMMU_NONE;
case SPAPR_TCE_RO:
return IOMMU_RO;
case SPAPR_TCE_WO:
return IOMMU_WO;
default: /* SPAPR_TCE_RW */
return IOMMU_RW;
}
}
/* Called from RCU critical section */
static IOMMUTLBEntry spapr_tce_translate_iommu(MemoryRegion *iommu, hwaddr addr,
bool is_write)
{
sPAPRTCETable *tcet = container_of(iommu, sPAPRTCETable, iommu);
uint64_t tce;
IOMMUTLBEntry ret = {
.target_as = &address_space_memory,
.iova = 0,
.translated_addr = 0,
.addr_mask = ~(hwaddr)0,
.perm = IOMMU_NONE,
};
if ((addr >> tcet->page_shift) < tcet->nb_table) {
/* Check if we are in bound */
hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
tce = tcet->table[addr >> tcet->page_shift];
ret.iova = addr & page_mask;
ret.translated_addr = tce & page_mask;
ret.addr_mask = ~page_mask;
ret.perm = spapr_tce_iommu_access_flags(tce);
}
trace_spapr_iommu_xlate(tcet->liobn, addr, ret.iova, ret.perm,
ret.addr_mask);
return ret;
}
static int spapr_tce_table_post_load(void *opaque, int version_id)
{
sPAPRTCETable *tcet = SPAPR_TCE_TABLE(opaque);
if (tcet->vdev) {
spapr_vio_set_bypass(tcet->vdev, tcet->bypass);
}
return 0;
}
static const VMStateDescription vmstate_spapr_tce_table = {
.name = "spapr_iommu",
.version_id = 2,
.minimum_version_id = 2,
.post_load = spapr_tce_table_post_load,
.fields = (VMStateField []) {
/* Sanity check */
VMSTATE_UINT32_EQUAL(liobn, sPAPRTCETable),
VMSTATE_UINT32_EQUAL(nb_table, sPAPRTCETable),
/* IOMMU state */
VMSTATE_BOOL(bypass, sPAPRTCETable),
VMSTATE_VARRAY_UINT32(table, sPAPRTCETable, nb_table, 0, vmstate_info_uint64, uint64_t),
VMSTATE_END_OF_LIST()
},
};
static MemoryRegionIOMMUOps spapr_iommu_ops = {
.translate = spapr_tce_translate_iommu,
};
static int spapr_tce_table_realize(DeviceState *dev)
{
sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
uint64_t window_size = (uint64_t)tcet->nb_table << tcet->page_shift;
if (kvm_enabled() && !(window_size >> 32)) {
tcet->table = kvmppc_create_spapr_tce(tcet->liobn,
window_size,
&tcet->fd,
tcet->need_vfio);
}
if (!tcet->table) {
size_t table_size = tcet->nb_table * sizeof(uint64_t);
tcet->table = g_malloc0(table_size);
}
trace_spapr_iommu_new_table(tcet->liobn, tcet, tcet->table, tcet->fd);
memory_region_init_iommu(&tcet->iommu, OBJECT(dev), &spapr_iommu_ops,
"iommu-spapr",
(uint64_t)tcet->nb_table << tcet->page_shift);
QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);
vmstate_register(DEVICE(tcet), tcet->liobn, &vmstate_spapr_tce_table,
tcet);
return 0;
}
void spapr_tce_set_need_vfio(sPAPRTCETable *tcet, bool need_vfio)
{
size_t table_size = tcet->nb_table * sizeof(uint64_t);
void *newtable;
if (need_vfio == tcet->need_vfio) {
/* Nothing to do */
return;
}
if (!need_vfio) {
/* FIXME: We don't support transition back to KVM accelerated
* TCEs yet */
return;
}
tcet->need_vfio = true;
if (tcet->fd < 0) {
/* Table is already in userspace, nothing to be do */
return;
}
newtable = g_malloc(table_size);
memcpy(newtable, tcet->table, table_size);
kvmppc_remove_spapr_tce(tcet->table, tcet->fd, tcet->nb_table);
tcet->fd = -1;
tcet->table = newtable;
}
sPAPRTCETable *spapr_tce_new_table(DeviceState *owner, uint32_t liobn,
uint64_t bus_offset,
uint32_t page_shift,
uint32_t nb_table,
bool need_vfio)
{
sPAPRTCETable *tcet;
char tmp[64];
if (spapr_tce_find_by_liobn(liobn)) {
fprintf(stderr, "Attempted to create TCE table with duplicate"
" LIOBN 0x%x\n", liobn);
return NULL;
}
if (!nb_table) {
return NULL;
}
tcet = SPAPR_TCE_TABLE(object_new(TYPE_SPAPR_TCE_TABLE));
tcet->liobn = liobn;
tcet->bus_offset = bus_offset;
tcet->page_shift = page_shift;
tcet->nb_table = nb_table;
tcet->need_vfio = need_vfio;
snprintf(tmp, sizeof(tmp), "tce-table-%x", liobn);
object_property_add_child(OBJECT(owner), tmp, OBJECT(tcet), NULL);
object_property_set_bool(OBJECT(tcet), true, "realized", NULL);
return tcet;
}
static void spapr_tce_table_unrealize(DeviceState *dev, Error **errp)
{
sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
QLIST_REMOVE(tcet, list);
if (!kvm_enabled() ||
(kvmppc_remove_spapr_tce(tcet->table, tcet->fd,
tcet->nb_table) != 0)) {
g_free(tcet->table);
}
}
MemoryRegion *spapr_tce_get_iommu(sPAPRTCETable *tcet)
{
return &tcet->iommu;
}
static void spapr_tce_reset(DeviceState *dev)
{
sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
size_t table_size = tcet->nb_table * sizeof(uint64_t);
memset(tcet->table, 0, table_size);
}
static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
target_ulong tce)
{
IOMMUTLBEntry entry;
hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift;
if (index >= tcet->nb_table) {
hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x"
TARGET_FMT_lx "\n", ioba);
return H_PARAMETER;
}
tcet->table[index] = tce;
entry.target_as = &address_space_memory,
entry.iova = ioba & page_mask;
entry.translated_addr = tce & page_mask;
entry.addr_mask = ~page_mask;
entry.perm = spapr_tce_iommu_access_flags(tce);
memory_region_notify_iommu(&tcet->iommu, entry);
return H_SUCCESS;
}
static target_ulong h_put_tce_indirect(PowerPCCPU *cpu,
sPAPRMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
int i;
target_ulong liobn = args[0];
target_ulong ioba = args[1];
target_ulong ioba1 = ioba;
target_ulong tce_list = args[2];
target_ulong npages = args[3];
target_ulong ret = H_PARAMETER, tce = 0;
sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
CPUState *cs = CPU(cpu);
hwaddr page_mask, page_size;
if (!tcet) {
return H_PARAMETER;
}
if ((npages > 512) || (tce_list & SPAPR_TCE_PAGE_MASK)) {
return H_PARAMETER;
}
page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
page_size = IOMMU_PAGE_SIZE(tcet->page_shift);
ioba &= page_mask;
for (i = 0; i < npages; ++i, ioba += page_size) {
tce = ldq_be_phys(cs->as, tce_list + i * sizeof(target_ulong));
ret = put_tce_emu(tcet, ioba, tce);
if (ret) {
break;
}
}
/* Trace last successful or the first problematic entry */
i = i ? (i - 1) : 0;
if (SPAPR_IS_PCI_LIOBN(liobn)) {
trace_spapr_iommu_pci_indirect(liobn, ioba1, tce_list, i, tce, ret);
} else {
trace_spapr_iommu_indirect(liobn, ioba1, tce_list, i, tce, ret);
}
return ret;
}
static target_ulong h_stuff_tce(PowerPCCPU *cpu, sPAPRMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
int i;
target_ulong liobn = args[0];
target_ulong ioba = args[1];
target_ulong tce_value = args[2];
target_ulong npages = args[3];
target_ulong ret = H_PARAMETER;
sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
hwaddr page_mask, page_size;
if (!tcet) {
return H_PARAMETER;
}
if (npages > tcet->nb_table) {
return H_PARAMETER;
}
page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
page_size = IOMMU_PAGE_SIZE(tcet->page_shift);
ioba &= page_mask;
for (i = 0; i < npages; ++i, ioba += page_size) {
ret = put_tce_emu(tcet, ioba, tce_value);
if (ret) {
break;
}
}
if (SPAPR_IS_PCI_LIOBN(liobn)) {
trace_spapr_iommu_pci_stuff(liobn, ioba, tce_value, npages, ret);
} else {
trace_spapr_iommu_stuff(liobn, ioba, tce_value, npages, ret);
}
return ret;
}
static target_ulong h_put_tce(PowerPCCPU *cpu, sPAPRMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong liobn = args[0];
target_ulong ioba = args[1];
target_ulong tce = args[2];
target_ulong ret = H_PARAMETER;
sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
if (tcet) {
hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
ioba &= page_mask;
ret = put_tce_emu(tcet, ioba, tce);
}
if (SPAPR_IS_PCI_LIOBN(liobn)) {
trace_spapr_iommu_pci_put(liobn, ioba, tce, ret);
} else {
trace_spapr_iommu_put(liobn, ioba, tce, ret);
}
return ret;
}
static target_ulong get_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
target_ulong *tce)
{
unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift;
if (index >= tcet->nb_table) {
hcall_dprintf("spapr_iommu_get_tce on out-of-bounds IOBA 0x"
TARGET_FMT_lx "\n", ioba);
return H_PARAMETER;
}
*tce = tcet->table[index];
return H_SUCCESS;
}
static target_ulong h_get_tce(PowerPCCPU *cpu, sPAPRMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong liobn = args[0];
target_ulong ioba = args[1];
target_ulong tce = 0;
target_ulong ret = H_PARAMETER;
sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
if (tcet) {
hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
ioba &= page_mask;
ret = get_tce_emu(tcet, ioba, &tce);
if (!ret) {
args[0] = tce;
}
}
if (SPAPR_IS_PCI_LIOBN(liobn)) {
trace_spapr_iommu_pci_get(liobn, ioba, ret, tce);
} else {
trace_spapr_iommu_get(liobn, ioba, ret, tce);
}
return ret;
}
int spapr_dma_dt(void *fdt, int node_off, const char *propname,
uint32_t liobn, uint64_t window, uint32_t size)
{
uint32_t dma_prop[5];
int ret;
dma_prop[0] = cpu_to_be32(liobn);
dma_prop[1] = cpu_to_be32(window >> 32);
dma_prop[2] = cpu_to_be32(window & 0xFFFFFFFF);
dma_prop[3] = 0; /* window size is 32 bits */
dma_prop[4] = cpu_to_be32(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, propname, dma_prop, sizeof(dma_prop));
if (ret < 0) {
return ret;
}
return 0;
}
int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname,
sPAPRTCETable *tcet)
{
if (!tcet) {
return 0;
}
return spapr_dma_dt(fdt, node_off, propname,
tcet->liobn, 0, tcet->nb_table << tcet->page_shift);
}
static void spapr_tce_table_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->init = spapr_tce_table_realize;
dc->reset = spapr_tce_reset;
dc->unrealize = spapr_tce_table_unrealize;
QLIST_INIT(&spapr_tce_tables);
/* hcall-tce */
spapr_register_hypercall(H_PUT_TCE, h_put_tce);
spapr_register_hypercall(H_GET_TCE, h_get_tce);
spapr_register_hypercall(H_PUT_TCE_INDIRECT, h_put_tce_indirect);
spapr_register_hypercall(H_STUFF_TCE, h_stuff_tce);
}
static TypeInfo spapr_tce_table_info = {
.name = TYPE_SPAPR_TCE_TABLE,
.parent = TYPE_DEVICE,
.instance_size = sizeof(sPAPRTCETable),
.class_init = spapr_tce_table_class_init,
};
static void register_types(void)
{
type_register_static(&spapr_tce_table_info);
}
type_init(register_types);
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