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qemu/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 "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 "hw/ppc/spapr.h"
#include <libfdt.h>
/* #define DEBUG_TCE */
enum sPAPRTCEAccess {
SPAPR_TCE_FAULT = 0,
SPAPR_TCE_RO = 1,
SPAPR_TCE_WO = 2,
SPAPR_TCE_RW = 3,
};
QLIST_HEAD(spapr_tce_tables, sPAPRTCETable) spapr_tce_tables;
static sPAPRTCETable *spapr_tce_find_by_liobn(uint32_t 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 == liobn) {
return tcet;
}
}
return NULL;
}
static IOMMUTLBEntry spapr_tce_translate_iommu(MemoryRegion *iommu, hwaddr addr)
{
sPAPRTCETable *tcet = container_of(iommu, sPAPRTCETable, iommu);
uint64_t tce;
#ifdef DEBUG_TCE
fprintf(stderr, "spapr_tce_translate liobn=0x%" PRIx32 " addr=0x"
DMA_ADDR_FMT "\n", tcet->liobn, addr);
#endif
if (tcet->bypass) {
return (IOMMUTLBEntry) {
.target_as = &address_space_memory,
.iova = 0,
.translated_addr = 0,
.addr_mask = ~(hwaddr)0,
.perm = IOMMU_RW,
};
}
/* Check if we are in bound */
if (addr >= tcet->window_size) {
#ifdef DEBUG_TCE
fprintf(stderr, "spapr_tce_translate out of bounds\n");
#endif
return (IOMMUTLBEntry) { .perm = IOMMU_NONE };
}
tce = tcet->table[addr >> SPAPR_TCE_PAGE_SHIFT];
#ifdef DEBUG_TCE
fprintf(stderr, " -> *paddr=0x%llx, *len=0x%llx\n",
(tce & ~SPAPR_TCE_PAGE_MASK), SPAPR_TCE_PAGE_MASK + 1);
#endif
return (IOMMUTLBEntry) {
.target_as = &address_space_memory,
.iova = addr & ~SPAPR_TCE_PAGE_MASK,
.translated_addr = tce & ~SPAPR_TCE_PAGE_MASK,
.addr_mask = SPAPR_TCE_PAGE_MASK,
.perm = tce,
};
}
static int spapr_tce_table_pre_load(void *opaque)
{
sPAPRTCETable *tcet = SPAPR_TCE_TABLE(opaque);
tcet->nb_table = tcet->window_size >> SPAPR_TCE_PAGE_SHIFT;
return 0;
}
static const VMStateDescription vmstate_spapr_tce_table = {
.name = "spapr_iommu",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.pre_load = spapr_tce_table_pre_load,
.fields = (VMStateField []) {
/* Sanity check */
VMSTATE_UINT32_EQUAL(liobn, sPAPRTCETable),
VMSTATE_UINT32_EQUAL(window_size, 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);
if (kvm_enabled()) {
tcet->table = kvmppc_create_spapr_tce(tcet->liobn,
tcet->window_size,
&tcet->fd);
}
if (!tcet->table) {
size_t table_size = (tcet->window_size >> SPAPR_TCE_PAGE_SHIFT)
* sizeof(uint64_t);
tcet->table = g_malloc0(table_size);
}
tcet->nb_table = tcet->window_size >> SPAPR_TCE_PAGE_SHIFT;
#ifdef DEBUG_TCE
fprintf(stderr, "spapr_iommu: New TCE table @ %p, liobn=0x%x, "
"table @ %p, fd=%d\n", tcet, liobn, tcet->table, tcet->fd);
#endif
memory_region_init_iommu(&tcet->iommu, OBJECT(dev), &spapr_iommu_ops,
"iommu-spapr", UINT64_MAX);
QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);
return 0;
}
sPAPRTCETable *spapr_tce_new_table(DeviceState *owner, uint32_t liobn, size_t window_size)
{
sPAPRTCETable *tcet;
if (spapr_tce_find_by_liobn(liobn)) {
fprintf(stderr, "Attempted to create TCE table with duplicate"
" LIOBN 0x%x\n", liobn);
return NULL;
}
if (!window_size) {
return NULL;
}
tcet = SPAPR_TCE_TABLE(object_new(TYPE_SPAPR_TCE_TABLE));
tcet->liobn = liobn;
tcet->window_size = window_size;
object_property_add_child(OBJECT(owner), "tce-table", OBJECT(tcet), NULL);
qdev_init_nofail(DEVICE(tcet));
return tcet;
}
static void spapr_tce_table_finalize(Object *obj)
{
sPAPRTCETable *tcet = SPAPR_TCE_TABLE(obj);
QLIST_REMOVE(tcet, list);
if (!kvm_enabled() ||
(kvmppc_remove_spapr_tce(tcet->table, tcet->fd,
tcet->window_size) != 0)) {
g_free(tcet->table);
}
}
MemoryRegion *spapr_tce_get_iommu(sPAPRTCETable *tcet)
{
return &tcet->iommu;
}
void spapr_tce_set_bypass(sPAPRTCETable *tcet, bool bypass)
{
tcet->bypass = bypass;
}
static void spapr_tce_reset(DeviceState *dev)
{
sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
size_t table_size = (tcet->window_size >> SPAPR_TCE_PAGE_SHIFT)
* sizeof(uint64_t);
tcet->bypass = false;
memset(tcet->table, 0, table_size);
}
static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
target_ulong tce)
{
IOMMUTLBEntry entry;
if (ioba >= tcet->window_size) {
hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x"
TARGET_FMT_lx "\n", ioba);
return H_PARAMETER;
}
tcet->table[ioba >> SPAPR_TCE_PAGE_SHIFT] = tce;
entry.target_as = &address_space_memory,
entry.iova = ioba & ~SPAPR_TCE_PAGE_MASK;
entry.translated_addr = tce & ~SPAPR_TCE_PAGE_MASK;
entry.addr_mask = SPAPR_TCE_PAGE_MASK;
entry.perm = tce;
memory_region_notify_iommu(&tcet->iommu, entry);
return H_SUCCESS;
}
static target_ulong h_put_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong liobn = args[0];
target_ulong ioba = args[1];
target_ulong tce = args[2];
sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
ioba &= ~(SPAPR_TCE_PAGE_SIZE - 1);
if (tcet) {
return put_tce_emu(tcet, ioba, tce);
}
#ifdef DEBUG_TCE
fprintf(stderr, "%s on liobn=" TARGET_FMT_lx /*%s*/
" ioba 0x" TARGET_FMT_lx " TCE 0x" TARGET_FMT_lx "\n",
__func__, liobn, /*dev->qdev.id, */ioba, tce);
#endif
return H_PARAMETER;
}
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->window_size);
}
static void spapr_tce_table_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->vmsd = &vmstate_spapr_tce_table;
dc->init = spapr_tce_table_realize;
dc->reset = spapr_tce_reset;
QLIST_INIT(&spapr_tce_tables);
/* hcall-tce */
spapr_register_hypercall(H_PUT_TCE, h_put_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,
.instance_finalize = spapr_tce_table_finalize,
};
static void register_types(void)
{
type_register_static(&spapr_tce_table_info);
}
type_init(register_types);
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