294 lines
7.3 KiB
C
294 lines
7.3 KiB
C
/*
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* QEMU sPAPR IOMMU (TCE) code
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*
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* Copyright (c) 2010 David Gibson, IBM Corporation <dwg@au1.ibm.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "hw/hw.h"
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#include "sysemu/kvm.h"
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#include "hw/qdev.h"
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#include "kvm_ppc.h"
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#include "sysemu/dma.h"
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#include "exec/address-spaces.h"
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#include "hw/ppc/spapr.h"
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#include <libfdt.h>
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/* #define DEBUG_TCE */
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enum sPAPRTCEAccess {
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SPAPR_TCE_FAULT = 0,
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SPAPR_TCE_RO = 1,
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SPAPR_TCE_WO = 2,
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SPAPR_TCE_RW = 3,
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};
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typedef struct sPAPRTCETable sPAPRTCETable;
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struct sPAPRTCETable {
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DMAContext dma;
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uint32_t liobn;
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uint32_t window_size;
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sPAPRTCE *table;
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bool bypass;
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int fd;
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QLIST_ENTRY(sPAPRTCETable) list;
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};
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QLIST_HEAD(spapr_tce_tables, sPAPRTCETable) spapr_tce_tables;
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static sPAPRTCETable *spapr_tce_find_by_liobn(uint32_t liobn)
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{
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sPAPRTCETable *tcet;
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if (liobn & 0xFFFFFFFF00000000ULL) {
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hcall_dprintf("Request for out-of-bounds LIOBN 0x" TARGET_FMT_lx "\n",
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liobn);
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return NULL;
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}
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QLIST_FOREACH(tcet, &spapr_tce_tables, list) {
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if (tcet->liobn == liobn) {
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return tcet;
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}
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}
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return NULL;
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}
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static int spapr_tce_translate(DMAContext *dma,
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dma_addr_t addr,
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hwaddr *paddr,
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hwaddr *len,
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DMADirection dir)
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{
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sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);
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enum sPAPRTCEAccess access = (dir == DMA_DIRECTION_FROM_DEVICE)
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? SPAPR_TCE_WO : SPAPR_TCE_RO;
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uint64_t tce;
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#ifdef DEBUG_TCE
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fprintf(stderr, "spapr_tce_translate liobn=0x%" PRIx32 " addr=0x"
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DMA_ADDR_FMT "\n", tcet->liobn, addr);
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#endif
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if (tcet->bypass) {
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*paddr = addr;
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*len = (hwaddr)-1;
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return 0;
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}
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/* Check if we are in bound */
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if (addr >= tcet->window_size) {
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#ifdef DEBUG_TCE
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fprintf(stderr, "spapr_tce_translate out of bounds\n");
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#endif
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return -EFAULT;
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}
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tce = tcet->table[addr >> SPAPR_TCE_PAGE_SHIFT].tce;
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/* Check TCE */
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if (!(tce & access)) {
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return -EPERM;
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}
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/* How much til end of page ? */
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*len = ((~addr) & SPAPR_TCE_PAGE_MASK) + 1;
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/* Translate */
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*paddr = (tce & ~SPAPR_TCE_PAGE_MASK) |
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(addr & SPAPR_TCE_PAGE_MASK);
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#ifdef DEBUG_TCE
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fprintf(stderr, " -> *paddr=0x" TARGET_FMT_plx ", *len=0x"
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TARGET_FMT_plx "\n", *paddr, *len);
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#endif
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return 0;
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}
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DMAContext *spapr_tce_new_dma_context(uint32_t liobn, size_t window_size)
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{
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sPAPRTCETable *tcet;
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if (spapr_tce_find_by_liobn(liobn)) {
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fprintf(stderr, "Attempted to create TCE table with duplicate"
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" LIOBN 0x%x\n", liobn);
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return NULL;
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}
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if (!window_size) {
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return NULL;
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}
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tcet = g_malloc0(sizeof(*tcet));
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dma_context_init(&tcet->dma, &address_space_memory, spapr_tce_translate, NULL, NULL);
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tcet->liobn = liobn;
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tcet->window_size = window_size;
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if (kvm_enabled()) {
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tcet->table = kvmppc_create_spapr_tce(liobn,
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window_size,
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&tcet->fd);
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}
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if (!tcet->table) {
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size_t table_size = (window_size >> SPAPR_TCE_PAGE_SHIFT)
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* sizeof(sPAPRTCE);
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tcet->table = g_malloc0(table_size);
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}
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#ifdef DEBUG_TCE
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fprintf(stderr, "spapr_iommu: New TCE table, liobn=0x%x, context @ %p, "
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"table @ %p, fd=%d\n", liobn, &tcet->dma, tcet->table, tcet->fd);
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#endif
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QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);
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return &tcet->dma;
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}
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void spapr_tce_free(DMAContext *dma)
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{
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if (dma) {
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sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);
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QLIST_REMOVE(tcet, list);
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if (!kvm_enabled() ||
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(kvmppc_remove_spapr_tce(tcet->table, tcet->fd,
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tcet->window_size) != 0)) {
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g_free(tcet->table);
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}
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g_free(tcet);
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}
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}
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void spapr_tce_set_bypass(DMAContext *dma, bool bypass)
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{
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sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);
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tcet->bypass = bypass;
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}
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void spapr_tce_reset(DMAContext *dma)
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{
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sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);
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size_t table_size = (tcet->window_size >> SPAPR_TCE_PAGE_SHIFT)
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* sizeof(sPAPRTCE);
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tcet->bypass = false;
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memset(tcet->table, 0, table_size);
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}
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static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
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target_ulong tce)
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{
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sPAPRTCE *tcep;
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if (ioba >= tcet->window_size) {
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hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x"
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TARGET_FMT_lx "\n", ioba);
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return H_PARAMETER;
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}
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tcep = tcet->table + (ioba >> SPAPR_TCE_PAGE_SHIFT);
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tcep->tce = tce;
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return H_SUCCESS;
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}
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static target_ulong h_put_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
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target_ulong opcode, target_ulong *args)
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{
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target_ulong liobn = args[0];
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target_ulong ioba = args[1];
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target_ulong tce = args[2];
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sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
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ioba &= ~(SPAPR_TCE_PAGE_SIZE - 1);
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if (tcet) {
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return put_tce_emu(tcet, ioba, tce);
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}
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#ifdef DEBUG_TCE
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fprintf(stderr, "%s on liobn=" TARGET_FMT_lx /*%s*/
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" ioba 0x" TARGET_FMT_lx " TCE 0x" TARGET_FMT_lx "\n",
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__func__, liobn, /*dev->qdev.id, */ioba, tce);
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#endif
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return H_PARAMETER;
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}
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void spapr_iommu_init(void)
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{
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QLIST_INIT(&spapr_tce_tables);
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/* hcall-tce */
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spapr_register_hypercall(H_PUT_TCE, h_put_tce);
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}
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int spapr_dma_dt(void *fdt, int node_off, const char *propname,
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uint32_t liobn, uint64_t window, uint32_t size)
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{
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uint32_t dma_prop[5];
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int ret;
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dma_prop[0] = cpu_to_be32(liobn);
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dma_prop[1] = cpu_to_be32(window >> 32);
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dma_prop[2] = cpu_to_be32(window & 0xFFFFFFFF);
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dma_prop[3] = 0; /* window size is 32 bits */
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dma_prop[4] = cpu_to_be32(size);
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ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2);
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if (ret < 0) {
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return ret;
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}
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ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2);
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if (ret < 0) {
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return ret;
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}
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ret = fdt_setprop(fdt, node_off, propname, dma_prop, sizeof(dma_prop));
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if (ret < 0) {
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return ret;
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}
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return 0;
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}
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int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname,
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DMAContext *iommu)
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{
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if (!iommu) {
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return 0;
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}
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if (iommu->translate == spapr_tce_translate) {
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sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, iommu);
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return spapr_dma_dt(fdt, node_off, propname,
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tcet->liobn, 0, tcet->window_size);
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}
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return -1;
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}
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