diff options
Diffstat (limited to 'hw/spapr_iommu.c')
| -rw-r--r-- | hw/spapr_iommu.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/hw/spapr_iommu.c b/hw/spapr_iommu.c new file mode 100644 index 0000000000..388ffa4b22 --- /dev/null +++ b/hw/spapr_iommu.c @@ -0,0 +1,246 @@ +/* + * 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; +} |