/*
* 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.h"
#include "kvm.h"
#include "qdev.h"
#include "kvm_ppc.h"
#include "dma.h"
#include "hw/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,
};
typedef struct sPAPRTCETable sPAPRTCETable;
struct sPAPRTCETable {
DMAContext dma;
uint32_t liobn;
uint32_t window_size;
sPAPRTCE *table;
int fd;
QLIST_ENTRY(sPAPRTCETable) list;
};
QLIST_HEAD(spapr_tce_tables, sPAPRTCETable) spapr_tce_tables;
static sPAPRTCETable *spapr_tce_find_by_liobn(uint32_t liobn)
{
sPAPRTCETable *tcet;
QLIST_FOREACH(tcet, &spapr_tce_tables, list) {
if (tcet->liobn == liobn) {
return tcet;
}
}
return NULL;
}
static int spapr_tce_translate(DMAContext *dma,
dma_addr_t addr,
target_phys_addr_t *paddr,
target_phys_addr_t *len,
DMADirection dir)
{
sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);
enum sPAPRTCEAccess access = (dir == DMA_DIRECTION_FROM_DEVICE)
? SPAPR_TCE_WO : SPAPR_TCE_RO;
uint64_t tce;
#ifdef DEBUG_TCE
fprintf(stderr, "spapr_tce_translate liobn=0x%" PRIx32 " addr=0x"
DMA_ADDR_FMT "\n", tcet->liobn, addr);
#endif
/* 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 -EFAULT;
}
tce = tcet->table[addr >> SPAPR_TCE_PAGE_SHIFT].tce;
/* Check TCE */
if (!(tce & access)) {
return -EPERM;
}
/* How much til end of page ? */
*len = ((~addr) & SPAPR_TCE_PAGE_MASK) + 1;
/* Translate */
*paddr = (tce & ~SPAPR_TCE_PAGE_MASK) |
(addr & SPAPR_TCE_PAGE_MASK);
#ifdef DEBUG_TCE
fprintf(stderr, " -> *paddr=0x" TARGET_FMT_plx ", *len=0x"
TARGET_FMT_plx "\n", *paddr, *len);
#endif
return 0;
}
DMAContext *spapr_tce_new_dma_context(uint32_t liobn, size_t window_size)
{
sPAPRTCETable *tcet;
if (!window_size) {
return NULL;
}
tcet = g_malloc0(sizeof(*tcet));
dma_context_init(&tcet->dma, spapr_tce_translate, NULL, NULL);
tcet->liobn = liobn;
tcet->window_size = window_size;
if (kvm_enabled()) {
tcet->table = kvmppc_create_spapr_tce(liobn,
window_size,
&tcet->fd);
}
if (!tcet->table) {
size_t table_size = (window_size >> SPAPR_TCE_PAGE_SHIFT)
* sizeof(sPAPRTCE);
tcet->table = g_malloc0(table_size);
}
#ifdef DEBUG_TCE
fprintf(stderr, "spapr_iommu: New TCE table, liobn=0x%x, context @ %p, "
"table @ %p, fd=%d\n", liobn, &tcet->dma, tcet->table, tcet->fd);
#endif
QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);
return &tcet->dma;
}
void spapr_tce_free(DMAContext *dma)
{
if (dma) {
sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);
QLIST_REMOVE(tcet, list);
if (!kvm_enabled() ||
(kvmppc_remove_spapr_tce(tcet->table, tcet->fd,
tcet->window_size) != 0)) {
g_free(tcet->table);
}
g_free(tcet);
}
}
static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
target_ulong tce)
{
sPAPRTCE *tcep;
if (ioba >= tcet->window_size) {
hcall_dprintf("spapr_vio_put_tce on out-of-boards IOBA 0x"
TARGET_FMT_lx "\n", ioba);
return H_PARAMETER;
}
tcep = tcet->table + (ioba >> SPAPR_TCE_PAGE_SHIFT);
tcep->tce = tce;
return H_SUCCESS;
}
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];
sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
if (liobn & 0xFFFFFFFF00000000ULL) {
hcall_dprintf("spapr_vio_put_tce on out-of-boundsw LIOBN "
TARGET_FMT_lx "\n", liobn);
return H_PARAMETER;
}
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;
}
void spapr_iommu_init(void)
{
QLIST_INIT(&spapr_tce_tables);
/* hcall-tce */
spapr_register_hypercall(H_PUT_TCE, h_put_tce);
}
int spapr_dma_dt(void *fdt, int node_off, const char *propname,
DMAContext *dma)
{
if (dma) {
sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);
uint32_t dma_prop[] = {cpu_to_be32(tcet->liobn),
0, 0,
0, cpu_to_be32(tcet->window_size)};
int ret;
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;
}
