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 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                                               tcet->vfio_accel);
 123     }
 124
 125     if (!tcet->table) {
 126         size_t table_size = tcet->nb_table * sizeof(uint64_t);
 127         tcet->table = g_malloc0(table_size);
 128     }
 129
 130     trace_spapr_iommu_new_table(tcet->liobn, tcet, tcet->table, tcet->fd);
 131
 132     memory_region_init_iommu(&tcet->iommu, OBJECT(dev), &spapr_iommu_ops,
 133                              "iommu-spapr", ram_size);
 134
 135     QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);
 136
 137     vmstate_register(DEVICE(tcet), tcet->liobn, &vmstate_spapr_tce_table,
 138                      tcet);
 139
 140     return 0;
 141 }
 142
 143 sPAPRTCETable *spapr_tce_new_table(DeviceState *owner, uint32_t liobn,
 144                                    uint64_t bus_offset,
 145                                    uint32_t page_shift,
 146                                    uint32_t nb_table,
 147                                    bool vfio_accel)
 148 {
 149     sPAPRTCETable *tcet;
 150
 151     if (spapr_tce_find_by_liobn(liobn)) {
 152         fprintf(stderr, "Attempted to create TCE table with duplicate"
 153                 " LIOBN 0x%x\n", liobn);
 154         return NULL;
 155     }
 156
 157     if (!nb_table) {
 158         return NULL;
 159     }
 160
 161     tcet = SPAPR_TCE_TABLE(object_new(TYPE_SPAPR_TCE_TABLE));
 162     tcet->liobn = liobn;
 163     tcet->bus_offset = bus_offset;
 164     tcet->page_shift = page_shift;
 165     tcet->nb_table = nb_table;
 166     tcet->vfio_accel = vfio_accel;
 167
 168     object_property_add_child(OBJECT(owner), "tce-table", OBJECT(tcet), NULL);
 169
 170     object_property_set_bool(OBJECT(tcet), true, "realized", NULL);
 171
 172     return tcet;
 173 }
 174
 175 static void spapr_tce_table_finalize(Object *obj)
 176 {
 177     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(obj);
 178
 179     QLIST_REMOVE(tcet, list);
 180
 181     if (!kvm_enabled() ||
 182         (kvmppc_remove_spapr_tce(tcet->table, tcet->fd,
 183                                  tcet->nb_table) != 0)) {
 184         g_free(tcet->table);
 185     }
 186 }
 187
 188 MemoryRegion *spapr_tce_get_iommu(sPAPRTCETable *tcet)
 189 {
 190     return &tcet->iommu;
 191 }
 192
 193 void spapr_tce_set_bypass(sPAPRTCETable *tcet, bool bypass)
 194 {
 195     tcet->bypass = bypass;
 196 }
 197
 198 static void spapr_tce_reset(DeviceState *dev)
 199 {
 200     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
 201     size_t table_size = tcet->nb_table * sizeof(uint64_t);
 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     IOMMUTLBEntry entry;
 211     hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 212     unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift;
 213
 214     if (index >= tcet->nb_table) {
 215         hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x"
 216                       TARGET_FMT_lx "\n", ioba);
 217         return H_PARAMETER;
 218     }
 219
 220     tcet->table[index] = tce;
 221
 222     entry.target_as = &address_space_memory,
 223     entry.iova = ioba & page_mask;
 224     entry.translated_addr = tce & page_mask;
 225     entry.addr_mask = ~page_mask;
 226     entry.perm = tce;
 227     memory_region_notify_iommu(&tcet->iommu, entry);
 228
 229     return H_SUCCESS;
 230 }
 231
 232 static target_ulong h_put_tce_indirect(PowerPCCPU *cpu,
 233                                        sPAPREnvironment *spapr,
 234                                        target_ulong opcode, target_ulong *args)
 235 {
 236     int i;
 237     target_ulong liobn = args[0];
 238     target_ulong ioba = args[1];
 239     target_ulong ioba1 = ioba;
 240     target_ulong tce_list = args[2];
 241     target_ulong npages = args[3];
 242     target_ulong ret = H_PARAMETER;
 243     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 244     CPUState *cs = CPU(cpu);
 245     hwaddr page_mask, page_size;
 246
 247     if (!tcet) {
 248         return H_PARAMETER;
 249     }
 250
 251     if ((npages > 512) || (tce_list & SPAPR_TCE_PAGE_MASK)) {
 252         return H_PARAMETER;
 253     }
 254
 255     page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 256     page_size = IOMMU_PAGE_SIZE(tcet->page_shift);
 257     ioba &= page_mask;
 258
 259     for (i = 0; i < npages; ++i, ioba += page_size) {
 260         target_ulong off = (tce_list & ~SPAPR_TCE_RW) +
 261                                 i * sizeof(target_ulong);
 262         target_ulong tce = ldq_phys(cs->as, off);
 263
 264         ret = put_tce_emu(tcet, ioba, tce);
 265         if (ret) {
 266             break;
 267         }
 268     }
 269
 270     /* Trace last successful or the first problematic entry */
 271     i = i ? (i - 1) : 0;
 272     trace_spapr_iommu_indirect(liobn, ioba1, tce_list, i,
 273                                ldq_phys(cs->as,
 274                                tce_list + i * sizeof(target_ulong)),
 275                                ret);
 276
 277     return ret;
 278 }
 279
 280 static target_ulong h_stuff_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 281                               target_ulong opcode, target_ulong *args)
 282 {
 283     int i;
 284     target_ulong liobn = args[0];
 285     target_ulong ioba = args[1];
 286     target_ulong tce_value = args[2];
 287     target_ulong npages = args[3];
 288     target_ulong ret = H_PARAMETER;
 289     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 290     hwaddr page_mask, page_size;
 291
 292     if (!tcet) {
 293         return H_PARAMETER;
 294     }
 295
 296     if (npages > tcet->nb_table) {
 297         return H_PARAMETER;
 298     }
 299
 300     page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 301     page_size = IOMMU_PAGE_SIZE(tcet->page_shift);
 302     ioba &= page_mask;
 303
 304     for (i = 0; i < npages; ++i, ioba += page_size) {
 305         ret = put_tce_emu(tcet, ioba, tce_value);
 306         if (ret) {
 307             break;
 308         }
 309     }
 310     trace_spapr_iommu_stuff(liobn, ioba, tce_value, npages, ret);
 311
 312     return ret;
 313 }
 314
 315 static target_ulong h_put_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 316                               target_ulong opcode, target_ulong *args)
 317 {
 318     target_ulong liobn = args[0];
 319     target_ulong ioba = args[1];
 320     target_ulong tce = args[2];
 321     target_ulong ret = H_PARAMETER;
 322     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 323
 324     if (tcet) {
 325         hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 326
 327         ioba &= page_mask;
 328
 329         ret = put_tce_emu(tcet, ioba, tce);
 330     }
 331     trace_spapr_iommu_put(liobn, ioba, tce, ret);
 332
 333     return ret;
 334 }
 335
 336 static target_ulong get_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
 337                                 target_ulong *tce)
 338 {
 339     unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift;
 340
 341     if (index >= tcet->nb_table) {
 342         hcall_dprintf("spapr_iommu_get_tce on out-of-bounds IOBA 0x"
 343                       TARGET_FMT_lx "\n", ioba);
 344         return H_PARAMETER;
 345     }
 346
 347     *tce = tcet->table[index];
 348
 349     return H_SUCCESS;
 350 }
 351
 352 static target_ulong h_get_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 353                               target_ulong opcode, target_ulong *args)
 354 {
 355     target_ulong liobn = args[0];
 356     target_ulong ioba = args[1];
 357     target_ulong tce = 0;
 358     target_ulong ret = H_PARAMETER;
 359     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 360
 361     if (tcet) {
 362         hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 363
 364         ioba &= page_mask;
 365
 366         ret = get_tce_emu(tcet, ioba, &tce);
 367         if (!ret) {
 368             args[0] = tce;
 369         }
 370     }
 371     trace_spapr_iommu_get(liobn, ioba, ret, tce);
 372
 373     return ret;
 374 }
 375
 376 int spapr_dma_dt(void *fdt, int node_off, const char *propname,
 377                  uint32_t liobn, uint64_t window, uint32_t size)
 378 {
 379     uint32_t dma_prop[5];
 380     int ret;
 381
 382     dma_prop[0] = cpu_to_be32(liobn);
 383     dma_prop[1] = cpu_to_be32(window >> 32);
 384     dma_prop[2] = cpu_to_be32(window & 0xFFFFFFFF);
 385     dma_prop[3] = 0; /* window size is 32 bits */
 386     dma_prop[4] = cpu_to_be32(size);
 387
 388     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2);
 389     if (ret < 0) {
 390         return ret;
 391     }
 392
 393     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2);
 394     if (ret < 0) {
 395         return ret;
 396     }
 397
 398     ret = fdt_setprop(fdt, node_off, propname, dma_prop, sizeof(dma_prop));
 399     if (ret < 0) {
 400         return ret;
 401     }
 402
 403     return 0;
 404 }
 405
 406 int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname,
 407                       sPAPRTCETable *tcet)
 408 {
 409     if (!tcet) {
 410         return 0;
 411     }
 412
 413     return spapr_dma_dt(fdt, node_off, propname,
 414                         tcet->liobn, 0, tcet->nb_table << tcet->page_shift);
 415 }
 416
 417 static void spapr_tce_table_class_init(ObjectClass *klass, void *data)
 418 {
 419     DeviceClass *dc = DEVICE_CLASS(klass);
 420     dc->init = spapr_tce_table_realize;
 421     dc->reset = spapr_tce_reset;
 422
 423     QLIST_INIT(&spapr_tce_tables);
 424
 425     /* hcall-tce */
 426     spapr_register_hypercall(H_PUT_TCE, h_put_tce);
 427     spapr_register_hypercall(H_GET_TCE, h_get_tce);
 428     spapr_register_hypercall(H_PUT_TCE_INDIRECT, h_put_tce_indirect);
 429     spapr_register_hypercall(H_STUFF_TCE, h_stuff_tce);
 430 }
 431
 432 static TypeInfo spapr_tce_table_info = {
 433     .name = TYPE_SPAPR_TCE_TABLE,
 434     .parent = TYPE_DEVICE,
 435     .instance_size = sizeof(sPAPRTCETable),
 436     .class_init = spapr_tce_table_class_init,
 437     .instance_finalize = spapr_tce_table_finalize,
 438 };
 439
 440 static void register_types(void)
 441 {
 442     type_register_static(&spapr_tce_table_info);
 443 }
 444
 445 type_init(register_types);