hw/ppc/spapr_iommu.c

   1 /*
   2  * QEMU sPAPR IOMMU (TCE) code
   3  *
   4  * Copyright (c) 2010 David Gibson, IBM Corporation <[email protected]>
   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 static IOMMUTLBEntry spapr_tce_translate_iommu(MemoryRegion *iommu, hwaddr addr)
  63 {
  64     sPAPRTCETable *tcet = container_of(iommu, sPAPRTCETable, iommu);
  65     uint64_t tce;
  66     IOMMUTLBEntry ret = {
  67         .target_as = &address_space_memory,
  68         .iova = 0,
  69         .translated_addr = 0,
  70         .addr_mask = ~(hwaddr)0,
  71         .perm = IOMMU_NONE,
  72     };
  73
  74     if (tcet->bypass) {
  75         ret.perm = IOMMU_RW;
  76     } else if ((addr >> tcet->page_shift) < tcet->nb_table) {
  77         /* Check if we are in bound */
  78         hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
  79
  80         tce = tcet->table[addr >> tcet->page_shift];
  81         ret.iova = addr & page_mask;
  82         ret.translated_addr = tce & page_mask;
  83         ret.addr_mask = ~page_mask;
  84         ret.perm = tce;
  85     }
  86     trace_spapr_iommu_xlate(tcet->liobn, addr, ret.iova, ret.perm,
  87                             ret.addr_mask);
  88
  89     return ret;
  90 }
  91
  92 static const VMStateDescription vmstate_spapr_tce_table = {
  93     .name = "spapr_iommu",
  94     .version_id = 2,
  95     .minimum_version_id = 2,
  96     .fields      = (VMStateField []) {
  97         /* Sanity check */
  98         VMSTATE_UINT32_EQUAL(liobn, sPAPRTCETable),
  99         VMSTATE_UINT32_EQUAL(nb_table, sPAPRTCETable),
 100
 101         /* IOMMU state */
 102         VMSTATE_BOOL(bypass, sPAPRTCETable),
 103         VMSTATE_VARRAY_UINT32(table, sPAPRTCETable, nb_table, 0, vmstate_info_uint64, uint64_t),
 104
 105         VMSTATE_END_OF_LIST()
 106     },
 107 };
 108
 109 static MemoryRegionIOMMUOps spapr_iommu_ops = {
 110     .translate = spapr_tce_translate_iommu,
 111 };
 112
 113 static int spapr_tce_table_realize(DeviceState *dev)
 114 {
 115     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
 116
 117     if (kvm_enabled()) {
 118         tcet->table = kvmppc_create_spapr_tce(tcet->liobn,
 119                                               tcet->nb_table <<
 120                                               tcet->page_shift,
 121                                               &tcet->fd);
 122     }
 123
 124     if (!tcet->table) {
 125         size_t table_size = tcet->nb_table * sizeof(uint64_t);
 126         tcet->table = g_malloc0(table_size);
 127     }
 128
 129     trace_spapr_iommu_new_table(tcet->liobn, tcet, tcet->table, tcet->fd);
 130
 131     memory_region_init_iommu(&tcet->iommu, OBJECT(dev), &spapr_iommu_ops,
 132                              "iommu-spapr", ram_size);
 133
 134     QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);
 135
 136     vmstate_register(DEVICE(tcet), tcet->liobn, &vmstate_spapr_tce_table,
 137                      tcet);
 138
 139     return 0;
 140 }
 141
 142 sPAPRTCETable *spapr_tce_new_table(DeviceState *owner, uint32_t liobn,
 143                                    uint64_t bus_offset,
 144                                    uint32_t page_shift,
 145                                    uint32_t nb_table)
 146 {
 147     sPAPRTCETable *tcet;
 148
 149     if (spapr_tce_find_by_liobn(liobn)) {
 150         fprintf(stderr, "Attempted to create TCE table with duplicate"
 151                 " LIOBN 0x%x\n", liobn);
 152         return NULL;
 153     }
 154
 155     if (!nb_table) {
 156         return NULL;
 157     }
 158
 159     tcet = SPAPR_TCE_TABLE(object_new(TYPE_SPAPR_TCE_TABLE));
 160     tcet->liobn = liobn;
 161     tcet->bus_offset = bus_offset;
 162     tcet->page_shift = page_shift;
 163     tcet->nb_table = nb_table;
 164
 165     object_property_add_child(OBJECT(owner), "tce-table", OBJECT(tcet), NULL);
 166
 167     object_property_set_bool(OBJECT(tcet), true, "realized", NULL);
 168
 169     return tcet;
 170 }
 171
 172 static void spapr_tce_table_finalize(Object *obj)
 173 {
 174     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(obj);
 175
 176     QLIST_REMOVE(tcet, list);
 177
 178     if (!kvm_enabled() ||
 179         (kvmppc_remove_spapr_tce(tcet->table, tcet->fd,
 180                                  tcet->nb_table) != 0)) {
 181         g_free(tcet->table);
 182     }
 183 }
 184
 185 MemoryRegion *spapr_tce_get_iommu(sPAPRTCETable *tcet)
 186 {
 187     return &tcet->iommu;
 188 }
 189
 190 void spapr_tce_set_bypass(sPAPRTCETable *tcet, bool bypass)
 191 {
 192     tcet->bypass = bypass;
 193 }
 194
 195 static void spapr_tce_reset(DeviceState *dev)
 196 {
 197     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
 198     size_t table_size = tcet->nb_table * sizeof(uint64_t);
 199
 200     tcet->bypass = false;
 201     memset(tcet->table, 0, table_size);
 202 }
 203
 204 static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
 205                                 target_ulong tce)
 206 {
 207     IOMMUTLBEntry entry;
 208     hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 209     unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift;
 210
 211     if (index >= tcet->nb_table) {
 212         hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x"
 213                       TARGET_FMT_lx "\n", ioba);
 214         return H_PARAMETER;
 215     }
 216
 217     tcet->table[index] = tce;
 218
 219     entry.target_as = &address_space_memory,
 220     entry.iova = ioba & page_mask;
 221     entry.translated_addr = tce & page_mask;
 222     entry.addr_mask = ~page_mask;
 223     entry.perm = tce;
 224     memory_region_notify_iommu(&tcet->iommu, entry);
 225
 226     return H_SUCCESS;
 227 }
 228
 229 static target_ulong h_put_tce_indirect(PowerPCCPU *cpu,
 230                                        sPAPREnvironment *spapr,
 231                                        target_ulong opcode, target_ulong *args)
 232 {
 233     int i;
 234     target_ulong liobn = args[0];
 235     target_ulong ioba = args[1];
 236     target_ulong ioba1 = ioba;
 237     target_ulong tce_list = args[2];
 238     target_ulong npages = args[3];
 239     target_ulong ret = H_PARAMETER;
 240     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 241     CPUState *cs = CPU(cpu);
 242     hwaddr page_mask, page_size;
 243
 244     if (!tcet) {
 245         return H_PARAMETER;
 246     }
 247
 248     if ((npages > 512) || (tce_list & SPAPR_TCE_PAGE_MASK)) {
 249         return H_PARAMETER;
 250     }
 251
 252     page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 253     page_size = IOMMU_PAGE_SIZE(tcet->page_shift);
 254     ioba &= page_mask;
 255
 256     for (i = 0; i < npages; ++i, ioba += page_size) {
 257         target_ulong off = (tce_list & ~SPAPR_TCE_RW) +
 258                                 i * sizeof(target_ulong);
 259         target_ulong tce = ldq_phys(cs->as, off);
 260
 261         ret = put_tce_emu(tcet, ioba, tce);
 262         if (ret) {
 263             break;
 264         }
 265     }
 266
 267     /* Trace last successful or the first problematic entry */
 268     i = i ? (i - 1) : 0;
 269     trace_spapr_iommu_indirect(liobn, ioba1, tce_list, i,
 270                                ldq_phys(cs->as,
 271                                tce_list + i * sizeof(target_ulong)),
 272                                ret);
 273
 274     return ret;
 275 }
 276
 277 static target_ulong h_stuff_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 278                               target_ulong opcode, target_ulong *args)
 279 {
 280     int i;
 281     target_ulong liobn = args[0];
 282     target_ulong ioba = args[1];
 283     target_ulong tce_value = args[2];
 284     target_ulong npages = args[3];
 285     target_ulong ret = H_PARAMETER;
 286     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 287     hwaddr page_mask, page_size;
 288
 289     if (!tcet) {
 290         return H_PARAMETER;
 291     }
 292
 293     if (npages > tcet->nb_table) {
 294         return H_PARAMETER;
 295     }
 296
 297     page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 298     page_size = IOMMU_PAGE_SIZE(tcet->page_shift);
 299     ioba &= page_mask;
 300
 301     for (i = 0; i < npages; ++i, ioba += page_size) {
 302         ret = put_tce_emu(tcet, ioba, tce_value);
 303         if (ret) {
 304             break;
 305         }
 306     }
 307     trace_spapr_iommu_stuff(liobn, ioba, tce_value, npages, ret);
 308
 309     return ret;
 310 }
 311
 312 static target_ulong h_put_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 313                               target_ulong opcode, target_ulong *args)
 314 {
 315     target_ulong liobn = args[0];
 316     target_ulong ioba = args[1];
 317     target_ulong tce = args[2];
 318     target_ulong ret = H_PARAMETER;
 319     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 320
 321     if (tcet) {
 322         hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 323
 324         ioba &= page_mask;
 325
 326         ret = put_tce_emu(tcet, ioba, tce);
 327     }
 328     trace_spapr_iommu_put(liobn, ioba, tce, ret);
 329
 330     return ret;
 331 }
 332
 333 static target_ulong get_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
 334                                 target_ulong *tce)
 335 {
 336     unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift;
 337
 338     if (index >= tcet->nb_table) {
 339         hcall_dprintf("spapr_iommu_get_tce on out-of-bounds IOBA 0x"
 340                       TARGET_FMT_lx "\n", ioba);
 341         return H_PARAMETER;
 342     }
 343
 344     *tce = tcet->table[index];
 345
 346     return H_SUCCESS;
 347 }
 348
 349 static target_ulong h_get_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 350                               target_ulong opcode, target_ulong *args)
 351 {
 352     target_ulong liobn = args[0];
 353     target_ulong ioba = args[1];
 354     target_ulong tce = 0;
 355     target_ulong ret = H_PARAMETER;
 356     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 357
 358     if (tcet) {
 359         hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 360
 361         ioba &= page_mask;
 362
 363         ret = get_tce_emu(tcet, ioba, &tce);
 364         if (!ret) {
 365             args[0] = tce;
 366         }
 367     }
 368     trace_spapr_iommu_get(liobn, ioba, ret, tce);
 369
 370     return ret;
 371 }
 372
 373 int spapr_dma_dt(void *fdt, int node_off, const char *propname,
 374                  uint32_t liobn, uint64_t window, uint32_t size)
 375 {
 376     uint32_t dma_prop[5];
 377     int ret;
 378
 379     dma_prop[0] = cpu_to_be32(liobn);
 380     dma_prop[1] = cpu_to_be32(window >> 32);
 381     dma_prop[2] = cpu_to_be32(window & 0xFFFFFFFF);
 382     dma_prop[3] = 0; /* window size is 32 bits */
 383     dma_prop[4] = cpu_to_be32(size);
 384
 385     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2);
 386     if (ret < 0) {
 387         return ret;
 388     }
 389
 390     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2);
 391     if (ret < 0) {
 392         return ret;
 393     }
 394
 395     ret = fdt_setprop(fdt, node_off, propname, dma_prop, sizeof(dma_prop));
 396     if (ret < 0) {
 397         return ret;
 398     }
 399
 400     return 0;
 401 }
 402
 403 int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname,
 404                       sPAPRTCETable *tcet)
 405 {
 406     if (!tcet) {
 407         return 0;
 408     }
 409
 410     return spapr_dma_dt(fdt, node_off, propname,
 411                         tcet->liobn, 0, tcet->nb_table << tcet->page_shift);
 412 }
 413
 414 static void spapr_tce_table_class_init(ObjectClass *klass, void *data)
 415 {
 416     DeviceClass *dc = DEVICE_CLASS(klass);
 417     dc->init = spapr_tce_table_realize;
 418     dc->reset = spapr_tce_reset;
 419
 420     QLIST_INIT(&spapr_tce_tables);
 421
 422     /* hcall-tce */
 423     spapr_register_hypercall(H_PUT_TCE, h_put_tce);
 424     spapr_register_hypercall(H_GET_TCE, h_get_tce);
 425     spapr_register_hypercall(H_PUT_TCE_INDIRECT, h_put_tce_indirect);
 426     spapr_register_hypercall(H_STUFF_TCE, h_stuff_tce);
 427 }
 428
 429 static TypeInfo spapr_tce_table_info = {
 430     .name = TYPE_SPAPR_TCE_TABLE,
 431     .parent = TYPE_DEVICE,
 432     .instance_size = sizeof(sPAPRTCETable),
 433     .class_init = spapr_tce_table_class_init,
 434     .instance_finalize = spapr_tce_table_finalize,
 435 };
 436
 437 static void register_types(void)
 438 {
 439     type_register_static(&spapr_tce_table_info);
 440 }
 441
 442 type_init(register_types);