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
  29 #include <libfdt.h>
  30
  31 enum sPAPRTCEAccess {
  32     SPAPR_TCE_FAULT = 0,
  33     SPAPR_TCE_RO = 1,
  34     SPAPR_TCE_WO = 2,
  35     SPAPR_TCE_RW = 3,
  36 };
  37
  38 #define IOMMU_PAGE_SIZE(shift)      (1ULL << (shift))
  39 #define IOMMU_PAGE_MASK(shift)      (~(IOMMU_PAGE_SIZE(shift) - 1))
  40
  41 static QLIST_HEAD(spapr_tce_tables, sPAPRTCETable) spapr_tce_tables;
  42
  43 static sPAPRTCETable *spapr_tce_find_by_liobn(uint32_t liobn)
  44 {
  45     sPAPRTCETable *tcet;
  46
  47     if (liobn & 0xFFFFFFFF00000000ULL) {
  48         hcall_dprintf("Request for out-of-bounds LIOBN 0x" TARGET_FMT_lx "\n",
  49                       liobn);
  50         return NULL;
  51     }
  52
  53     QLIST_FOREACH(tcet, &spapr_tce_tables, list) {
  54         if (tcet->liobn == liobn) {
  55             return tcet;
  56         }
  57     }
  58
  59     return NULL;
  60 }
  61
  62 /* Called from RCU critical section */
  63 static IOMMUTLBEntry spapr_tce_translate_iommu(MemoryRegion *iommu, hwaddr addr,
  64                                                bool is_write)
  65 {
  66     sPAPRTCETable *tcet = container_of(iommu, sPAPRTCETable, iommu);
  67     uint64_t tce;
  68     IOMMUTLBEntry ret = {
  69         .target_as = &address_space_memory,
  70         .iova = 0,
  71         .translated_addr = 0,
  72         .addr_mask = ~(hwaddr)0,
  73         .perm = IOMMU_NONE,
  74     };
  75
  76     if (tcet->bypass) {
  77         ret.perm = IOMMU_RW;
  78     } else if ((addr >> tcet->page_shift) < tcet->nb_table) {
  79         /* Check if we are in bound */
  80         hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
  81
  82         tce = tcet->table[addr >> tcet->page_shift];
  83         ret.iova = addr & page_mask;
  84         ret.translated_addr = tce & page_mask;
  85         ret.addr_mask = ~page_mask;
  86         ret.perm = tce & IOMMU_RW;
  87     }
  88     trace_spapr_iommu_xlate(tcet->liobn, addr, ret.iova, ret.perm,
  89                             ret.addr_mask);
  90
  91     return ret;
  92 }
  93
  94 static const VMStateDescription vmstate_spapr_tce_table = {
  95     .name = "spapr_iommu",
  96     .version_id = 2,
  97     .minimum_version_id = 2,
  98     .fields      = (VMStateField []) {
  99         /* Sanity check */
 100         VMSTATE_UINT32_EQUAL(liobn, sPAPRTCETable),
 101         VMSTATE_UINT32_EQUAL(nb_table, sPAPRTCETable),
 102
 103         /* IOMMU state */
 104         VMSTATE_BOOL(bypass, sPAPRTCETable),
 105         VMSTATE_VARRAY_UINT32(table, sPAPRTCETable, nb_table, 0, vmstate_info_uint64, uint64_t),
 106
 107         VMSTATE_END_OF_LIST()
 108     },
 109 };
 110
 111 static MemoryRegionIOMMUOps spapr_iommu_ops = {
 112     .translate = spapr_tce_translate_iommu,
 113 };
 114
 115 static int spapr_tce_table_realize(DeviceState *dev)
 116 {
 117     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
 118
 119     if (kvm_enabled()) {
 120         tcet->table = kvmppc_create_spapr_tce(tcet->liobn,
 121                                               tcet->nb_table <<
 122                                               tcet->page_shift,
 123                                               &tcet->fd,
 124                                               tcet->vfio_accel);
 125     }
 126
 127     if (!tcet->table) {
 128         size_t table_size = tcet->nb_table * sizeof(uint64_t);
 129         tcet->table = g_malloc0(table_size);
 130     }
 131
 132     trace_spapr_iommu_new_table(tcet->liobn, tcet, tcet->table, tcet->fd);
 133
 134     memory_region_init_iommu(&tcet->iommu, OBJECT(dev), &spapr_iommu_ops,
 135                              "iommu-spapr", ram_size);
 136
 137     QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);
 138
 139     vmstate_register(DEVICE(tcet), tcet->liobn, &vmstate_spapr_tce_table,
 140                      tcet);
 141
 142     return 0;
 143 }
 144
 145 sPAPRTCETable *spapr_tce_new_table(DeviceState *owner, uint32_t liobn,
 146                                    uint64_t bus_offset,
 147                                    uint32_t page_shift,
 148                                    uint32_t nb_table,
 149                                    bool vfio_accel)
 150 {
 151     sPAPRTCETable *tcet;
 152
 153     if (spapr_tce_find_by_liobn(liobn)) {
 154         fprintf(stderr, "Attempted to create TCE table with duplicate"
 155                 " LIOBN 0x%x\n", liobn);
 156         return NULL;
 157     }
 158
 159     if (!nb_table) {
 160         return NULL;
 161     }
 162
 163     tcet = SPAPR_TCE_TABLE(object_new(TYPE_SPAPR_TCE_TABLE));
 164     tcet->liobn = liobn;
 165     tcet->bus_offset = bus_offset;
 166     tcet->page_shift = page_shift;
 167     tcet->nb_table = nb_table;
 168     tcet->vfio_accel = vfio_accel;
 169
 170     object_property_add_child(OBJECT(owner), "tce-table", OBJECT(tcet), NULL);
 171
 172     object_property_set_bool(OBJECT(tcet), true, "realized", NULL);
 173
 174     return tcet;
 175 }
 176
 177 static void spapr_tce_table_unrealize(DeviceState *dev, Error **errp)
 178 {
 179     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
 180
 181     QLIST_REMOVE(tcet, list);
 182
 183     if (!kvm_enabled() ||
 184         (kvmppc_remove_spapr_tce(tcet->table, tcet->fd,
 185                                  tcet->nb_table) != 0)) {
 186         g_free(tcet->table);
 187     }
 188 }
 189
 190 MemoryRegion *spapr_tce_get_iommu(sPAPRTCETable *tcet)
 191 {
 192     return &tcet->iommu;
 193 }
 194
 195 void spapr_tce_set_bypass(sPAPRTCETable *tcet, bool bypass)
 196 {
 197     tcet->bypass = bypass;
 198 }
 199
 200 static void spapr_tce_reset(DeviceState *dev)
 201 {
 202     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
 203     size_t table_size = tcet->nb_table * sizeof(uint64_t);
 204
 205     tcet->bypass = false;
 206     memset(tcet->table, 0, table_size);
 207 }
 208
 209 static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
 210                                 target_ulong tce)
 211 {
 212     IOMMUTLBEntry entry;
 213     hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 214     unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift;
 215
 216     if (index >= tcet->nb_table) {
 217         hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x"
 218                       TARGET_FMT_lx "\n", ioba);
 219         return H_PARAMETER;
 220     }
 221
 222     tcet->table[index] = tce;
 223
 224     entry.target_as = &address_space_memory,
 225     entry.iova = ioba & page_mask;
 226     entry.translated_addr = tce & page_mask;
 227     entry.addr_mask = ~page_mask;
 228     entry.perm = tce & IOMMU_RW;
 229     memory_region_notify_iommu(&tcet->iommu, entry);
 230
 231     return H_SUCCESS;
 232 }
 233
 234 static target_ulong h_put_tce_indirect(PowerPCCPU *cpu,
 235                                        sPAPREnvironment *spapr,
 236                                        target_ulong opcode, target_ulong *args)
 237 {
 238     int i;
 239     target_ulong liobn = args[0];
 240     target_ulong ioba = args[1];
 241     target_ulong ioba1 = ioba;
 242     target_ulong tce_list = args[2];
 243     target_ulong npages = args[3];
 244     target_ulong ret = H_PARAMETER;
 245     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 246     CPUState *cs = CPU(cpu);
 247     hwaddr page_mask, page_size;
 248
 249     if (!tcet) {
 250         return H_PARAMETER;
 251     }
 252
 253     if ((npages > 512) || (tce_list & SPAPR_TCE_PAGE_MASK)) {
 254         return H_PARAMETER;
 255     }
 256
 257     page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 258     page_size = IOMMU_PAGE_SIZE(tcet->page_shift);
 259     ioba &= page_mask;
 260
 261     for (i = 0; i < npages; ++i, ioba += page_size) {
 262         target_ulong off = (tce_list & ~SPAPR_TCE_RW) +
 263                                 i * sizeof(target_ulong);
 264         target_ulong tce = ldq_phys(cs->as, off);
 265
 266         ret = put_tce_emu(tcet, ioba, tce);
 267         if (ret) {
 268             break;
 269         }
 270     }
 271
 272     /* Trace last successful or the first problematic entry */
 273     i = i ? (i - 1) : 0;
 274     trace_spapr_iommu_indirect(liobn, ioba1, tce_list, i,
 275                                ldq_phys(cs->as,
 276                                tce_list + i * sizeof(target_ulong)),
 277                                ret);
 278
 279     return ret;
 280 }
 281
 282 static target_ulong h_stuff_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 283                               target_ulong opcode, target_ulong *args)
 284 {
 285     int i;
 286     target_ulong liobn = args[0];
 287     target_ulong ioba = args[1];
 288     target_ulong tce_value = args[2];
 289     target_ulong npages = args[3];
 290     target_ulong ret = H_PARAMETER;
 291     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 292     hwaddr page_mask, page_size;
 293
 294     if (!tcet) {
 295         return H_PARAMETER;
 296     }
 297
 298     if (npages > tcet->nb_table) {
 299         return H_PARAMETER;
 300     }
 301
 302     page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 303     page_size = IOMMU_PAGE_SIZE(tcet->page_shift);
 304     ioba &= page_mask;
 305
 306     for (i = 0; i < npages; ++i, ioba += page_size) {
 307         ret = put_tce_emu(tcet, ioba, tce_value);
 308         if (ret) {
 309             break;
 310         }
 311     }
 312     trace_spapr_iommu_stuff(liobn, ioba, tce_value, npages, ret);
 313
 314     return ret;
 315 }
 316
 317 static target_ulong h_put_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 318                               target_ulong opcode, target_ulong *args)
 319 {
 320     target_ulong liobn = args[0];
 321     target_ulong ioba = args[1];
 322     target_ulong tce = args[2];
 323     target_ulong ret = H_PARAMETER;
 324     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 325
 326     if (tcet) {
 327         hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 328
 329         ioba &= page_mask;
 330
 331         ret = put_tce_emu(tcet, ioba, tce);
 332     }
 333     trace_spapr_iommu_put(liobn, ioba, tce, ret);
 334
 335     return ret;
 336 }
 337
 338 static target_ulong get_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
 339                                 target_ulong *tce)
 340 {
 341     unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift;
 342
 343     if (index >= tcet->nb_table) {
 344         hcall_dprintf("spapr_iommu_get_tce on out-of-bounds IOBA 0x"
 345                       TARGET_FMT_lx "\n", ioba);
 346         return H_PARAMETER;
 347     }
 348
 349     *tce = tcet->table[index];
 350
 351     return H_SUCCESS;
 352 }
 353
 354 static target_ulong h_get_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 355                               target_ulong opcode, target_ulong *args)
 356 {
 357     target_ulong liobn = args[0];
 358     target_ulong ioba = args[1];
 359     target_ulong tce = 0;
 360     target_ulong ret = H_PARAMETER;
 361     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 362
 363     if (tcet) {
 364         hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 365
 366         ioba &= page_mask;
 367
 368         ret = get_tce_emu(tcet, ioba, &tce);
 369         if (!ret) {
 370             args[0] = tce;
 371         }
 372     }
 373     trace_spapr_iommu_get(liobn, ioba, ret, tce);
 374
 375     return ret;
 376 }
 377
 378 int spapr_dma_dt(void *fdt, int node_off, const char *propname,
 379                  uint32_t liobn, uint64_t window, uint32_t size)
 380 {
 381     uint32_t dma_prop[5];
 382     int ret;
 383
 384     dma_prop[0] = cpu_to_be32(liobn);
 385     dma_prop[1] = cpu_to_be32(window >> 32);
 386     dma_prop[2] = cpu_to_be32(window & 0xFFFFFFFF);
 387     dma_prop[3] = 0; /* window size is 32 bits */
 388     dma_prop[4] = cpu_to_be32(size);
 389
 390     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2);
 391     if (ret < 0) {
 392         return ret;
 393     }
 394
 395     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2);
 396     if (ret < 0) {
 397         return ret;
 398     }
 399
 400     ret = fdt_setprop(fdt, node_off, propname, dma_prop, sizeof(dma_prop));
 401     if (ret < 0) {
 402         return ret;
 403     }
 404
 405     return 0;
 406 }
 407
 408 int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname,
 409                       sPAPRTCETable *tcet)
 410 {
 411     if (!tcet) {
 412         return 0;
 413     }
 414
 415     return spapr_dma_dt(fdt, node_off, propname,
 416                         tcet->liobn, 0, tcet->nb_table << tcet->page_shift);
 417 }
 418
 419 static void spapr_tce_table_class_init(ObjectClass *klass, void *data)
 420 {
 421     DeviceClass *dc = DEVICE_CLASS(klass);
 422     dc->init = spapr_tce_table_realize;
 423     dc->reset = spapr_tce_reset;
 424     dc->unrealize = spapr_tce_table_unrealize;
 425
 426     QLIST_INIT(&spapr_tce_tables);
 427
 428     /* hcall-tce */
 429     spapr_register_hypercall(H_PUT_TCE, h_put_tce);
 430     spapr_register_hypercall(H_GET_TCE, h_get_tce);
 431     spapr_register_hypercall(H_PUT_TCE_INDIRECT, h_put_tce_indirect);
 432     spapr_register_hypercall(H_STUFF_TCE, h_stuff_tce);
 433 }
 434
 435 static TypeInfo spapr_tce_table_info = {
 436     .name = TYPE_SPAPR_TCE_TABLE,
 437     .parent = TYPE_DEVICE,
 438     .instance_size = sizeof(sPAPRTCETable),
 439     .class_init = spapr_tce_table_class_init,
 440 };
 441
 442 static void register_types(void)
 443 {
 444     type_register_static(&spapr_tce_table_info);
 445 }
 446
 447 type_init(register_types);