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     uint32_t liobn;
  41     uint32_t window_size;
  42     sPAPRTCE *table;
  43     bool bypass;
  44     int fd;
  45     MemoryRegion iommu;
  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(MemoryRegion *iommu, hwaddr addr)
  72 {
  73     sPAPRTCETable *tcet = container_of(iommu, sPAPRTCETable, iommu);
  74     uint64_t tce;
  75
  76 #ifdef DEBUG_TCE
  77     fprintf(stderr, "spapr_tce_translate liobn=0x%" PRIx32 " addr=0x"
  78             DMA_ADDR_FMT "\n", tcet->liobn, addr);
  79 #endif
  80
  81     if (tcet->bypass) {
  82         return (IOMMUTLBEntry) {
  83             .target_as = &address_space_memory,
  84             .iova = 0,
  85             .translated_addr = 0,
  86             .addr_mask = ~(hwaddr)0,
  87             .perm = IOMMU_RW,
  88         };
  89     }
  90
  91     /* Check if we are in bound */
  92     if (addr >= tcet->window_size) {
  93 #ifdef DEBUG_TCE
  94         fprintf(stderr, "spapr_tce_translate out of bounds\n");
  95 #endif
  96         return (IOMMUTLBEntry) { .perm = IOMMU_NONE };
  97     }
  98
  99     tce = tcet->table[addr >> SPAPR_TCE_PAGE_SHIFT].tce;
 100
 101 #ifdef DEBUG_TCE
 102     fprintf(stderr, " ->  *paddr=0x%llx, *len=0x%llx\n",
 103             (tce & ~SPAPR_TCE_PAGE_MASK), SPAPR_TCE_PAGE_MASK + 1);
 104 #endif
 105
 106     return (IOMMUTLBEntry) {
 107         .target_as = &address_space_memory,
 108         .iova = addr & ~SPAPR_TCE_PAGE_MASK,
 109         .translated_addr = tce & ~SPAPR_TCE_PAGE_MASK,
 110         .addr_mask = SPAPR_TCE_PAGE_MASK,
 111         .perm = tce,
 112     };
 113 }
 114
 115 static MemoryRegionIOMMUOps spapr_iommu_ops = {
 116     .translate = spapr_tce_translate_iommu,
 117 };
 118
 119 sPAPRTCETable *spapr_tce_new_table(DeviceState *owner, uint32_t liobn, size_t window_size)
 120 {
 121     sPAPRTCETable *tcet;
 122
 123     if (spapr_tce_find_by_liobn(liobn)) {
 124         fprintf(stderr, "Attempted to create TCE table with duplicate"
 125                 " LIOBN 0x%x\n", liobn);
 126         return NULL;
 127     }
 128
 129     if (!window_size) {
 130         return NULL;
 131     }
 132
 133     tcet = g_malloc0(sizeof(*tcet));
 134     tcet->liobn = liobn;
 135     tcet->window_size = window_size;
 136
 137     if (kvm_enabled()) {
 138         tcet->table = kvmppc_create_spapr_tce(liobn,
 139                                               window_size,
 140                                               &tcet->fd);
 141     }
 142
 143     if (!tcet->table) {
 144         size_t table_size = (window_size >> SPAPR_TCE_PAGE_SHIFT)
 145             * sizeof(sPAPRTCE);
 146         tcet->table = g_malloc0(table_size);
 147     }
 148
 149 #ifdef DEBUG_TCE
 150     fprintf(stderr, "spapr_iommu: New TCE table @ %p, liobn=0x%x, "
 151             "table @ %p, fd=%d\n", tcet, liobn, tcet->table, tcet->fd);
 152 #endif
 153
 154     memory_region_init_iommu(&tcet->iommu, OBJECT(owner), &spapr_iommu_ops,
 155                              "iommu-spapr", UINT64_MAX);
 156
 157     QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);
 158
 159     return tcet;
 160 }
 161
 162 void spapr_tce_free(sPAPRTCETable *tcet)
 163 {
 164     QLIST_REMOVE(tcet, list);
 165
 166     if (!kvm_enabled() ||
 167         (kvmppc_remove_spapr_tce(tcet->table, tcet->fd,
 168                                  tcet->window_size) != 0)) {
 169         g_free(tcet->table);
 170     }
 171
 172     g_free(tcet);
 173 }
 174
 175 MemoryRegion *spapr_tce_get_iommu(sPAPRTCETable *tcet)
 176 {
 177     return &tcet->iommu;
 178 }
 179
 180 void spapr_tce_set_bypass(sPAPRTCETable *tcet, bool bypass)
 181 {
 182     tcet->bypass = bypass;
 183 }
 184
 185 void spapr_tce_reset(sPAPRTCETable *tcet)
 186 {
 187     size_t table_size = (tcet->window_size >> SPAPR_TCE_PAGE_SHIFT)
 188         * sizeof(sPAPRTCE);
 189
 190     tcet->bypass = false;
 191     memset(tcet->table, 0, table_size);
 192 }
 193
 194 static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
 195                                 target_ulong tce)
 196 {
 197     sPAPRTCE *tcep;
 198     IOMMUTLBEntry entry;
 199
 200     if (ioba >= tcet->window_size) {
 201         hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x"
 202                       TARGET_FMT_lx "\n", ioba);
 203         return H_PARAMETER;
 204     }
 205
 206     tcep = tcet->table + (ioba >> SPAPR_TCE_PAGE_SHIFT);
 207     tcep->tce = tce;
 208
 209     entry.target_as = &address_space_memory,
 210     entry.iova = ioba & ~SPAPR_TCE_PAGE_MASK;
 211     entry.translated_addr = tce & ~SPAPR_TCE_PAGE_MASK;
 212     entry.addr_mask = SPAPR_TCE_PAGE_MASK;
 213     entry.perm = tce;
 214     memory_region_notify_iommu(&tcet->iommu, entry);
 215
 216     return H_SUCCESS;
 217 }
 218
 219 static target_ulong h_put_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 220                               target_ulong opcode, target_ulong *args)
 221 {
 222     target_ulong liobn = args[0];
 223     target_ulong ioba = args[1];
 224     target_ulong tce = args[2];
 225     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 226
 227     ioba &= ~(SPAPR_TCE_PAGE_SIZE - 1);
 228
 229     if (tcet) {
 230         return put_tce_emu(tcet, ioba, tce);
 231     }
 232 #ifdef DEBUG_TCE
 233     fprintf(stderr, "%s on liobn=" TARGET_FMT_lx /*%s*/
 234             "  ioba 0x" TARGET_FMT_lx "  TCE 0x" TARGET_FMT_lx "\n",
 235             __func__, liobn, /*dev->qdev.id, */ioba, tce);
 236 #endif
 237
 238     return H_PARAMETER;
 239 }
 240
 241 void spapr_iommu_init(void)
 242 {
 243     QLIST_INIT(&spapr_tce_tables);
 244
 245     /* hcall-tce */
 246     spapr_register_hypercall(H_PUT_TCE, h_put_tce);
 247 }
 248
 249 int spapr_dma_dt(void *fdt, int node_off, const char *propname,
 250                  uint32_t liobn, uint64_t window, uint32_t size)
 251 {
 252     uint32_t dma_prop[5];
 253     int ret;
 254
 255     dma_prop[0] = cpu_to_be32(liobn);
 256     dma_prop[1] = cpu_to_be32(window >> 32);
 257     dma_prop[2] = cpu_to_be32(window & 0xFFFFFFFF);
 258     dma_prop[3] = 0; /* window size is 32 bits */
 259     dma_prop[4] = cpu_to_be32(size);
 260
 261     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2);
 262     if (ret < 0) {
 263         return ret;
 264     }
 265
 266     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2);
 267     if (ret < 0) {
 268         return ret;
 269     }
 270
 271     ret = fdt_setprop(fdt, node_off, propname, dma_prop, sizeof(dma_prop));
 272     if (ret < 0) {
 273         return ret;
 274     }
 275
 276     return 0;
 277 }
 278
 279 int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname,
 280                       sPAPRTCETable *tcet)
 281 {
 282     if (!tcet) {
 283         return 0;
 284     }
 285
 286     return spapr_dma_dt(fdt, node_off, propname,
 287                         tcet->liobn, 0, tcet->window_size);
 288 }