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 #include "trace.h"
  26
  27 #include "hw/ppc/spapr.h"
  28 #include "hw/ppc/spapr_vio.h"
  29
  30 #include <libfdt.h>
  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 #define IOMMU_PAGE_SIZE(shift)      (1ULL << (shift))
  40 #define IOMMU_PAGE_MASK(shift)      (~(IOMMU_PAGE_SIZE(shift) - 1))
  41
  42 static QLIST_HEAD(spapr_tce_tables, sPAPRTCETable) spapr_tce_tables;
  43
  44 static sPAPRTCETable *spapr_tce_find_by_liobn(uint32_t liobn)
  45 {
  46     sPAPRTCETable *tcet;
  47
  48     if (liobn & 0xFFFFFFFF00000000ULL) {
  49         hcall_dprintf("Request for out-of-bounds LIOBN 0x" TARGET_FMT_lx "\n",
  50                       liobn);
  51         return NULL;
  52     }
  53
  54     QLIST_FOREACH(tcet, &spapr_tce_tables, list) {
  55         if (tcet->liobn == liobn) {
  56             return tcet;
  57         }
  58     }
  59
  60     return NULL;
  61 }
  62
  63 /* Called from RCU critical section */
  64 static IOMMUTLBEntry spapr_tce_translate_iommu(MemoryRegion *iommu, hwaddr addr,
  65                                                bool is_write)
  66 {
  67     sPAPRTCETable *tcet = container_of(iommu, sPAPRTCETable, iommu);
  68     uint64_t tce;
  69     IOMMUTLBEntry ret = {
  70         .target_as = &address_space_memory,
  71         .iova = 0,
  72         .translated_addr = 0,
  73         .addr_mask = ~(hwaddr)0,
  74         .perm = IOMMU_NONE,
  75     };
  76
  77     if ((addr >> tcet->page_shift) < tcet->nb_table) {
  78         /* Check if we are in bound */
  79         hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
  80
  81         tce = tcet->table[addr >> tcet->page_shift];
  82         ret.iova = addr & page_mask;
  83         ret.translated_addr = tce & page_mask;
  84         ret.addr_mask = ~page_mask;
  85         ret.perm = tce & IOMMU_RW;
  86     }
  87     trace_spapr_iommu_xlate(tcet->liobn, addr, ret.iova, ret.perm,
  88                             ret.addr_mask);
  89
  90     return ret;
  91 }
  92
  93 static int spapr_tce_table_post_load(void *opaque, int version_id)
  94 {
  95     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(opaque);
  96
  97     if (tcet->vdev) {
  98         spapr_vio_set_bypass(tcet->vdev, tcet->bypass);
  99     }
 100
 101     return 0;
 102 }
 103
 104 static const VMStateDescription vmstate_spapr_tce_table = {
 105     .name = "spapr_iommu",
 106     .version_id = 2,
 107     .minimum_version_id = 2,
 108     .post_load = spapr_tce_table_post_load,
 109     .fields      = (VMStateField []) {
 110         /* Sanity check */
 111         VMSTATE_UINT32_EQUAL(liobn, sPAPRTCETable),
 112         VMSTATE_UINT32_EQUAL(nb_table, sPAPRTCETable),
 113
 114         /* IOMMU state */
 115         VMSTATE_BOOL(bypass, sPAPRTCETable),
 116         VMSTATE_VARRAY_UINT32(table, sPAPRTCETable, nb_table, 0, vmstate_info_uint64, uint64_t),
 117
 118         VMSTATE_END_OF_LIST()
 119     },
 120 };
 121
 122 static MemoryRegionIOMMUOps spapr_iommu_ops = {
 123     .translate = spapr_tce_translate_iommu,
 124 };
 125
 126 static int spapr_tce_table_realize(DeviceState *dev)
 127 {
 128     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
 129
 130     if (kvm_enabled()) {
 131         tcet->table = kvmppc_create_spapr_tce(tcet->liobn,
 132                                               tcet->nb_table <<
 133                                               tcet->page_shift,
 134                                               &tcet->fd,
 135                                               tcet->vfio_accel);
 136     }
 137
 138     if (!tcet->table) {
 139         size_t table_size = tcet->nb_table * sizeof(uint64_t);
 140         tcet->table = g_malloc0(table_size);
 141     }
 142
 143     trace_spapr_iommu_new_table(tcet->liobn, tcet, tcet->table, tcet->fd);
 144
 145     memory_region_init_iommu(&tcet->iommu, OBJECT(dev), &spapr_iommu_ops,
 146                              "iommu-spapr",
 147                              (uint64_t)tcet->nb_table << tcet->page_shift);
 148
 149     QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);
 150
 151     vmstate_register(DEVICE(tcet), tcet->liobn, &vmstate_spapr_tce_table,
 152                      tcet);
 153
 154     return 0;
 155 }
 156
 157 sPAPRTCETable *spapr_tce_new_table(DeviceState *owner, uint32_t liobn,
 158                                    uint64_t bus_offset,
 159                                    uint32_t page_shift,
 160                                    uint32_t nb_table,
 161                                    bool vfio_accel)
 162 {
 163     sPAPRTCETable *tcet;
 164
 165     if (spapr_tce_find_by_liobn(liobn)) {
 166         fprintf(stderr, "Attempted to create TCE table with duplicate"
 167                 " LIOBN 0x%x\n", liobn);
 168         return NULL;
 169     }
 170
 171     if (!nb_table) {
 172         return NULL;
 173     }
 174
 175     tcet = SPAPR_TCE_TABLE(object_new(TYPE_SPAPR_TCE_TABLE));
 176     tcet->liobn = liobn;
 177     tcet->bus_offset = bus_offset;
 178     tcet->page_shift = page_shift;
 179     tcet->nb_table = nb_table;
 180     tcet->vfio_accel = vfio_accel;
 181
 182     object_property_add_child(OBJECT(owner), "tce-table", OBJECT(tcet), NULL);
 183
 184     object_property_set_bool(OBJECT(tcet), true, "realized", NULL);
 185
 186     return tcet;
 187 }
 188
 189 static void spapr_tce_table_unrealize(DeviceState *dev, Error **errp)
 190 {
 191     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
 192
 193     QLIST_REMOVE(tcet, list);
 194
 195     if (!kvm_enabled() ||
 196         (kvmppc_remove_spapr_tce(tcet->table, tcet->fd,
 197                                  tcet->nb_table) != 0)) {
 198         g_free(tcet->table);
 199     }
 200 }
 201
 202 MemoryRegion *spapr_tce_get_iommu(sPAPRTCETable *tcet)
 203 {
 204     return &tcet->iommu;
 205 }
 206
 207 static void spapr_tce_reset(DeviceState *dev)
 208 {
 209     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
 210     size_t table_size = tcet->nb_table * sizeof(uint64_t);
 211
 212     memset(tcet->table, 0, table_size);
 213 }
 214
 215 static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
 216                                 target_ulong tce)
 217 {
 218     IOMMUTLBEntry entry;
 219     hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 220     unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift;
 221
 222     if (index >= tcet->nb_table) {
 223         hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x"
 224                       TARGET_FMT_lx "\n", ioba);
 225         return H_PARAMETER;
 226     }
 227
 228     tcet->table[index] = tce;
 229
 230     entry.target_as = &address_space_memory,
 231     entry.iova = ioba & page_mask;
 232     entry.translated_addr = tce & page_mask;
 233     entry.addr_mask = ~page_mask;
 234     entry.perm = tce & IOMMU_RW;
 235     memory_region_notify_iommu(&tcet->iommu, entry);
 236
 237     return H_SUCCESS;
 238 }
 239
 240 static target_ulong h_put_tce_indirect(PowerPCCPU *cpu,
 241                                        sPAPREnvironment *spapr,
 242                                        target_ulong opcode, target_ulong *args)
 243 {
 244     int i;
 245     target_ulong liobn = args[0];
 246     target_ulong ioba = args[1];
 247     target_ulong ioba1 = ioba;
 248     target_ulong tce_list = args[2];
 249     target_ulong npages = args[3];
 250     target_ulong ret = H_PARAMETER;
 251     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 252     CPUState *cs = CPU(cpu);
 253     hwaddr page_mask, page_size;
 254
 255     if (!tcet) {
 256         return H_PARAMETER;
 257     }
 258
 259     if ((npages > 512) || (tce_list & SPAPR_TCE_PAGE_MASK)) {
 260         return H_PARAMETER;
 261     }
 262
 263     page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 264     page_size = IOMMU_PAGE_SIZE(tcet->page_shift);
 265     ioba &= page_mask;
 266
 267     for (i = 0; i < npages; ++i, ioba += page_size) {
 268         target_ulong off = (tce_list & ~SPAPR_TCE_RW) +
 269                                 i * sizeof(target_ulong);
 270         target_ulong tce = ldq_phys(cs->as, off);
 271
 272         ret = put_tce_emu(tcet, ioba, tce);
 273         if (ret) {
 274             break;
 275         }
 276     }
 277
 278     /* Trace last successful or the first problematic entry */
 279     i = i ? (i - 1) : 0;
 280     trace_spapr_iommu_indirect(liobn, ioba1, tce_list, i,
 281                                ldq_phys(cs->as,
 282                                tce_list + i * sizeof(target_ulong)),
 283                                ret);
 284
 285     return ret;
 286 }
 287
 288 static target_ulong h_stuff_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 289                               target_ulong opcode, target_ulong *args)
 290 {
 291     int i;
 292     target_ulong liobn = args[0];
 293     target_ulong ioba = args[1];
 294     target_ulong tce_value = args[2];
 295     target_ulong npages = args[3];
 296     target_ulong ret = H_PARAMETER;
 297     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 298     hwaddr page_mask, page_size;
 299
 300     if (!tcet) {
 301         return H_PARAMETER;
 302     }
 303
 304     if (npages > tcet->nb_table) {
 305         return H_PARAMETER;
 306     }
 307
 308     page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 309     page_size = IOMMU_PAGE_SIZE(tcet->page_shift);
 310     ioba &= page_mask;
 311
 312     for (i = 0; i < npages; ++i, ioba += page_size) {
 313         ret = put_tce_emu(tcet, ioba, tce_value);
 314         if (ret) {
 315             break;
 316         }
 317     }
 318     trace_spapr_iommu_stuff(liobn, ioba, tce_value, npages, ret);
 319
 320     return ret;
 321 }
 322
 323 static target_ulong h_put_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 324                               target_ulong opcode, target_ulong *args)
 325 {
 326     target_ulong liobn = args[0];
 327     target_ulong ioba = args[1];
 328     target_ulong tce = args[2];
 329     target_ulong ret = H_PARAMETER;
 330     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 331
 332     if (tcet) {
 333         hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 334
 335         ioba &= page_mask;
 336
 337         ret = put_tce_emu(tcet, ioba, tce);
 338     }
 339     trace_spapr_iommu_put(liobn, ioba, tce, ret);
 340
 341     return ret;
 342 }
 343
 344 static target_ulong get_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
 345                                 target_ulong *tce)
 346 {
 347     unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift;
 348
 349     if (index >= tcet->nb_table) {
 350         hcall_dprintf("spapr_iommu_get_tce on out-of-bounds IOBA 0x"
 351                       TARGET_FMT_lx "\n", ioba);
 352         return H_PARAMETER;
 353     }
 354
 355     *tce = tcet->table[index];
 356
 357     return H_SUCCESS;
 358 }
 359
 360 static target_ulong h_get_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 361                               target_ulong opcode, target_ulong *args)
 362 {
 363     target_ulong liobn = args[0];
 364     target_ulong ioba = args[1];
 365     target_ulong tce = 0;
 366     target_ulong ret = H_PARAMETER;
 367     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 368
 369     if (tcet) {
 370         hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 371
 372         ioba &= page_mask;
 373
 374         ret = get_tce_emu(tcet, ioba, &tce);
 375         if (!ret) {
 376             args[0] = tce;
 377         }
 378     }
 379     trace_spapr_iommu_get(liobn, ioba, ret, tce);
 380
 381     return ret;
 382 }
 383
 384 int spapr_dma_dt(void *fdt, int node_off, const char *propname,
 385                  uint32_t liobn, uint64_t window, uint32_t size)
 386 {
 387     uint32_t dma_prop[5];
 388     int ret;
 389
 390     dma_prop[0] = cpu_to_be32(liobn);
 391     dma_prop[1] = cpu_to_be32(window >> 32);
 392     dma_prop[2] = cpu_to_be32(window & 0xFFFFFFFF);
 393     dma_prop[3] = 0; /* window size is 32 bits */
 394     dma_prop[4] = cpu_to_be32(size);
 395
 396     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2);
 397     if (ret < 0) {
 398         return ret;
 399     }
 400
 401     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2);
 402     if (ret < 0) {
 403         return ret;
 404     }
 405
 406     ret = fdt_setprop(fdt, node_off, propname, dma_prop, sizeof(dma_prop));
 407     if (ret < 0) {
 408         return ret;
 409     }
 410
 411     return 0;
 412 }
 413
 414 int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname,
 415                       sPAPRTCETable *tcet)
 416 {
 417     if (!tcet) {
 418         return 0;
 419     }
 420
 421     return spapr_dma_dt(fdt, node_off, propname,
 422                         tcet->liobn, 0, tcet->nb_table << tcet->page_shift);
 423 }
 424
 425 static void spapr_tce_table_class_init(ObjectClass *klass, void *data)
 426 {
 427     DeviceClass *dc = DEVICE_CLASS(klass);
 428     dc->init = spapr_tce_table_realize;
 429     dc->reset = spapr_tce_reset;
 430     dc->unrealize = spapr_tce_table_unrealize;
 431
 432     QLIST_INIT(&spapr_tce_tables);
 433
 434     /* hcall-tce */
 435     spapr_register_hypercall(H_PUT_TCE, h_put_tce);
 436     spapr_register_hypercall(H_GET_TCE, h_get_tce);
 437     spapr_register_hypercall(H_PUT_TCE_INDIRECT, h_put_tce_indirect);
 438     spapr_register_hypercall(H_STUFF_TCE, h_stuff_tce);
 439 }
 440
 441 static TypeInfo spapr_tce_table_info = {
 442     .name = TYPE_SPAPR_TCE_TABLE,
 443     .parent = TYPE_DEVICE,
 444     .instance_size = sizeof(sPAPRTCETable),
 445     .class_init = spapr_tce_table_class_init,
 446 };
 447
 448 static void register_types(void)
 449 {
 450     type_register_static(&spapr_tce_table_info);
 451 }
 452
 453 type_init(register_types);