hw/ppc/spapr_iommu.c

   1 /*
   2  * QEMU sPAPR IOMMU (TCE) code
   3  *
   4  * Copyright (c) 2010 David Gibson, IBM Corporation <dwg@au1.ibm.com>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include "hw/hw.h"
  20 #include "sysemu/kvm.h"
  21 #include "hw/qdev.h"
  22 #include "kvm_ppc.h"
  23 #include "sysemu/dma.h"
  24 #include "exec/address-spaces.h"
  25
  26 #include "hw/ppc/spapr.h"
  27
  28 #include <libfdt.h>
  29
  30 /* #define DEBUG_TCE */
  31
  32 enum sPAPRTCEAccess {
  33     SPAPR_TCE_FAULT = 0,
  34     SPAPR_TCE_RO = 1,
  35     SPAPR_TCE_WO = 2,
  36     SPAPR_TCE_RW = 3,
  37 };
  38
  39 struct sPAPRTCETable {
  40     DMAContext dma;
  41     uint32_t liobn;
  42     uint32_t window_size;
  43     sPAPRTCE *table;
  44     bool bypass;
  45     int fd;
  46     QLIST_ENTRY(sPAPRTCETable) list;
  47 };
  48
  49
  50 QLIST_HEAD(spapr_tce_tables, sPAPRTCETable) spapr_tce_tables;
  51
  52 static sPAPRTCETable *spapr_tce_find_by_liobn(uint32_t liobn)
  53 {
  54     sPAPRTCETable *tcet;
  55
  56     if (liobn & 0xFFFFFFFF00000000ULL) {
  57         hcall_dprintf("Request for out-of-bounds LIOBN 0x" TARGET_FMT_lx "\n",
  58                       liobn);
  59         return NULL;
  60     }
  61
  62     QLIST_FOREACH(tcet, &spapr_tce_tables, list) {
  63         if (tcet->liobn == liobn) {
  64             return tcet;
  65         }
  66     }
  67
  68     return NULL;
  69 }
  70
  71 static IOMMUTLBEntry spapr_tce_translate_iommu(sPAPRTCETable *tcet, hwaddr addr)
  72 {
  73     uint64_t tce;
  74
  75 #ifdef DEBUG_TCE
  76     fprintf(stderr, "spapr_tce_translate liobn=0x%" PRIx32 " addr=0x"
  77             DMA_ADDR_FMT "\n", tcet->liobn, addr);
  78 #endif
  79
  80     if (tcet->bypass) {
  81         return (IOMMUTLBEntry) {
  82             .target_as = &address_space_memory,
  83             .iova = 0,
  84             .translated_addr = 0,
  85             .addr_mask = ~(hwaddr)0,
  86             .perm = IOMMU_RW,
  87         };
  88     }
  89
  90     /* Check if we are in bound */
  91     if (addr >= tcet->window_size) {
  92 #ifdef DEBUG_TCE
  93         fprintf(stderr, "spapr_tce_translate out of bounds\n");
  94 #endif
  95         return (IOMMUTLBEntry) { .perm = IOMMU_NONE };
  96     }
  97
  98     tce = tcet->table[addr >> SPAPR_TCE_PAGE_SHIFT].tce;
  99
 100 #ifdef DEBUG_TCE
 101     fprintf(stderr, " ->  *paddr=0x%llx, *len=0x%llx\n",
 102             (tce & ~SPAPR_TCE_PAGE_MASK), SPAPR_TCE_PAGE_MASK + 1);
 103 #endif
 104
 105     return (IOMMUTLBEntry) {
 106         .target_as = &address_space_memory,
 107         .iova = addr & ~SPAPR_TCE_PAGE_MASK,
 108         .translated_addr = tce & ~SPAPR_TCE_PAGE_MASK,
 109         .addr_mask = SPAPR_TCE_PAGE_MASK,
 110         .perm = tce,
 111     };
 112 }
 113
 114 static int spapr_tce_translate(DMAContext *dma,
 115                                dma_addr_t addr,
 116                                hwaddr *paddr,
 117                                hwaddr *len,
 118                                DMADirection dir)
 119  {
 120     sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);
 121     bool is_write = (dir == DMA_DIRECTION_FROM_DEVICE);
 122     IOMMUTLBEntry entry = spapr_tce_translate_iommu(tcet, addr);
 123     if (!(entry.perm & (1 << is_write))) {
 124         return -EPERM;
 125     }
 126
 127     /* Translate */
 128     *paddr = entry.translated_addr | (addr & entry.addr_mask);
 129     *len = (addr | entry.addr_mask) - addr + 1;
 130     return 0;
 131 }
 132
 133 sPAPRTCETable *spapr_tce_new_table(uint32_t liobn, size_t window_size)
 134 {
 135     sPAPRTCETable *tcet;
 136
 137     if (spapr_tce_find_by_liobn(liobn)) {
 138         fprintf(stderr, "Attempted to create TCE table with duplicate"
 139                 " LIOBN 0x%x\n", liobn);
 140         return NULL;
 141     }
 142
 143     if (!window_size) {
 144         return NULL;
 145     }
 146
 147     tcet = g_malloc0(sizeof(*tcet));
 148     dma_context_init(&tcet->dma, &address_space_memory, spapr_tce_translate, NULL, NULL);
 149
 150     tcet->liobn = liobn;
 151     tcet->window_size = window_size;
 152
 153     if (kvm_enabled()) {
 154         tcet->table = kvmppc_create_spapr_tce(liobn,
 155                                               window_size,
 156                                               &tcet->fd);
 157     }
 158
 159     if (!tcet->table) {
 160         size_t table_size = (window_size >> SPAPR_TCE_PAGE_SHIFT)
 161             * sizeof(sPAPRTCE);
 162         tcet->table = g_malloc0(table_size);
 163     }
 164
 165 #ifdef DEBUG_TCE
 166     fprintf(stderr, "spapr_iommu: New TCE table @ %p, liobn=0x%x, "
 167             "table @ %p, fd=%d\n", tcet, liobn, tcet->table, tcet->fd);
 168 #endif
 169
 170     QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);
 171
 172     return tcet;
 173 }
 174
 175 void spapr_tce_free(sPAPRTCETable *tcet)
 176 {
 177     QLIST_REMOVE(tcet, list);
 178
 179     if (!kvm_enabled() ||
 180         (kvmppc_remove_spapr_tce(tcet->table, tcet->fd,
 181                                  tcet->window_size) != 0)) {
 182         g_free(tcet->table);
 183     }
 184
 185     g_free(tcet);
 186 }
 187
 188 DMAContext *spapr_tce_get_dma(sPAPRTCETable *tcet)
 189 {
 190     return &tcet->dma;
 191 }
 192
 193 void spapr_tce_set_bypass(sPAPRTCETable *tcet, bool bypass)
 194 {
 195     tcet->bypass = bypass;
 196 }
 197
 198 void spapr_tce_reset(sPAPRTCETable *tcet)
 199 {
 200     size_t table_size = (tcet->window_size >> SPAPR_TCE_PAGE_SHIFT)
 201         * sizeof(sPAPRTCE);
 202
 203     tcet->bypass = false;
 204     memset(tcet->table, 0, table_size);
 205 }
 206
 207 static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
 208                                 target_ulong tce)
 209 {
 210     sPAPRTCE *tcep;
 211
 212     if (ioba >= tcet->window_size) {
 213         hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x"
 214                       TARGET_FMT_lx "\n", ioba);
 215         return H_PARAMETER;
 216     }
 217
 218     tcep = tcet->table + (ioba >> SPAPR_TCE_PAGE_SHIFT);
 219     tcep->tce = tce;
 220
 221     return H_SUCCESS;
 222 }
 223
 224 static target_ulong h_put_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 225                               target_ulong opcode, target_ulong *args)
 226 {
 227     target_ulong liobn = args[0];
 228     target_ulong ioba = args[1];
 229     target_ulong tce = args[2];
 230     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 231
 232     ioba &= ~(SPAPR_TCE_PAGE_SIZE - 1);
 233
 234     if (tcet) {
 235         return put_tce_emu(tcet, ioba, tce);
 236     }
 237 #ifdef DEBUG_TCE
 238     fprintf(stderr, "%s on liobn=" TARGET_FMT_lx /*%s*/
 239             "  ioba 0x" TARGET_FMT_lx "  TCE 0x" TARGET_FMT_lx "\n",
 240             __func__, liobn, /*dev->qdev.id, */ioba, tce);
 241 #endif
 242
 243     return H_PARAMETER;
 244 }
 245
 246 void spapr_iommu_init(void)
 247 {
 248     QLIST_INIT(&spapr_tce_tables);
 249
 250     /* hcall-tce */
 251     spapr_register_hypercall(H_PUT_TCE, h_put_tce);
 252 }
 253
 254 int spapr_dma_dt(void *fdt, int node_off, const char *propname,
 255                  uint32_t liobn, uint64_t window, uint32_t size)
 256 {
 257     uint32_t dma_prop[5];
 258     int ret;
 259
 260     dma_prop[0] = cpu_to_be32(liobn);
 261     dma_prop[1] = cpu_to_be32(window >> 32);
 262     dma_prop[2] = cpu_to_be32(window & 0xFFFFFFFF);
 263     dma_prop[3] = 0; /* window size is 32 bits */
 264     dma_prop[4] = cpu_to_be32(size);
 265
 266     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2);
 267     if (ret < 0) {
 268         return ret;
 269     }
 270
 271     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2);
 272     if (ret < 0) {
 273         return ret;
 274     }
 275
 276     ret = fdt_setprop(fdt, node_off, propname, dma_prop, sizeof(dma_prop));
 277     if (ret < 0) {
 278         return ret;
 279     }
 280
 281     return 0;
 282 }
 283
 284 int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname,
 285                       sPAPRTCETable *tcet)
 286 {
 287     if (!tcet) {
 288         return 0;
 289     }
 290
 291     return spapr_dma_dt(fdt, node_off, propname,
 292                         tcet->liobn, 0, tcet->window_size);
 293 }