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 typedef struct sPAPRTCETable sPAPRTCETable;
  40
  41 struct sPAPRTCETable {
  42     DMAContext dma;
  43     uint32_t liobn;
  44     uint32_t window_size;
  45     sPAPRTCE *table;
  46     bool bypass;
  47     int fd;
  48     QLIST_ENTRY(sPAPRTCETable) list;
  49 };
  50
  51
  52 QLIST_HEAD(spapr_tce_tables, sPAPRTCETable) spapr_tce_tables;
  53
  54 static sPAPRTCETable *spapr_tce_find_by_liobn(uint32_t liobn)
  55 {
  56     sPAPRTCETable *tcet;
  57
  58     if (liobn & 0xFFFFFFFF00000000ULL) {
  59         hcall_dprintf("Request for out-of-bounds LIOBN 0x" TARGET_FMT_lx "\n",
  60                       liobn);
  61         return NULL;
  62     }
  63
  64     QLIST_FOREACH(tcet, &spapr_tce_tables, list) {
  65         if (tcet->liobn == liobn) {
  66             return tcet;
  67         }
  68     }
  69
  70     return NULL;
  71 }
  72
  73 static int spapr_tce_translate(DMAContext *dma,
  74                                dma_addr_t addr,
  75                                hwaddr *paddr,
  76                                hwaddr *len,
  77                                DMADirection dir)
  78 {
  79     sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);
  80     enum sPAPRTCEAccess access = (dir == DMA_DIRECTION_FROM_DEVICE)
  81         ? SPAPR_TCE_WO : SPAPR_TCE_RO;
  82     uint64_t tce;
  83
  84 #ifdef DEBUG_TCE
  85     fprintf(stderr, "spapr_tce_translate liobn=0x%" PRIx32 " addr=0x"
  86             DMA_ADDR_FMT "\n", tcet->liobn, addr);
  87 #endif
  88
  89     if (tcet->bypass) {
  90         *paddr = addr;
  91         *len = (hwaddr)-1;
  92         return 0;
  93     }
  94
  95     /* Check if we are in bound */
  96     if (addr >= tcet->window_size) {
  97 #ifdef DEBUG_TCE
  98         fprintf(stderr, "spapr_tce_translate out of bounds\n");
  99 #endif
 100         return -EFAULT;
 101     }
 102
 103     tce = tcet->table[addr >> SPAPR_TCE_PAGE_SHIFT].tce;
 104
 105     /* Check TCE */
 106     if (!(tce & access)) {
 107         return -EPERM;
 108     }
 109
 110     /* How much til end of page ? */
 111     *len = ((~addr) & SPAPR_TCE_PAGE_MASK) + 1;
 112
 113     /* Translate */
 114     *paddr = (tce & ~SPAPR_TCE_PAGE_MASK) |
 115         (addr & SPAPR_TCE_PAGE_MASK);
 116
 117 #ifdef DEBUG_TCE
 118     fprintf(stderr, " ->  *paddr=0x" TARGET_FMT_plx ", *len=0x"
 119             TARGET_FMT_plx "\n", *paddr, *len);
 120 #endif
 121
 122     return 0;
 123 }
 124
 125 DMAContext *spapr_tce_new_dma_context(uint32_t liobn, size_t window_size)
 126 {
 127     sPAPRTCETable *tcet;
 128
 129     if (spapr_tce_find_by_liobn(liobn)) {
 130         fprintf(stderr, "Attempted to create TCE table with duplicate"
 131                 " LIOBN 0x%x\n", liobn);
 132         return NULL;
 133     }
 134
 135     if (!window_size) {
 136         return NULL;
 137     }
 138
 139     tcet = g_malloc0(sizeof(*tcet));
 140     dma_context_init(&tcet->dma, &address_space_memory, spapr_tce_translate, NULL, NULL);
 141
 142     tcet->liobn = liobn;
 143     tcet->window_size = window_size;
 144
 145     if (kvm_enabled()) {
 146         tcet->table = kvmppc_create_spapr_tce(liobn,
 147                                               window_size,
 148                                               &tcet->fd);
 149     }
 150
 151     if (!tcet->table) {
 152         size_t table_size = (window_size >> SPAPR_TCE_PAGE_SHIFT)
 153             * sizeof(sPAPRTCE);
 154         tcet->table = g_malloc0(table_size);
 155     }
 156
 157 #ifdef DEBUG_TCE
 158     fprintf(stderr, "spapr_iommu: New TCE table, liobn=0x%x, context @ %p, "
 159             "table @ %p, fd=%d\n", liobn, &tcet->dma, tcet->table, tcet->fd);
 160 #endif
 161
 162     QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);
 163
 164     return &tcet->dma;
 165 }
 166
 167 void spapr_tce_free(DMAContext *dma)
 168 {
 169
 170     if (dma) {
 171         sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);
 172
 173         QLIST_REMOVE(tcet, list);
 174
 175         if (!kvm_enabled() ||
 176             (kvmppc_remove_spapr_tce(tcet->table, tcet->fd,
 177                                      tcet->window_size) != 0)) {
 178             g_free(tcet->table);
 179         }
 180
 181         g_free(tcet);
 182     }
 183 }
 184
 185 void spapr_tce_set_bypass(DMAContext *dma, bool bypass)
 186 {
 187     sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);
 188
 189     tcet->bypass = bypass;
 190 }
 191
 192 void spapr_tce_reset(DMAContext *dma)
 193 {
 194     sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, dma);
 195     size_t table_size = (tcet->window_size >> SPAPR_TCE_PAGE_SHIFT)
 196         * sizeof(sPAPRTCE);
 197
 198     tcet->bypass = false;
 199     memset(tcet->table, 0, table_size);
 200 }
 201
 202 static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
 203                                 target_ulong tce)
 204 {
 205     sPAPRTCE *tcep;
 206
 207     if (ioba >= tcet->window_size) {
 208         hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x"
 209                       TARGET_FMT_lx "\n", ioba);
 210         return H_PARAMETER;
 211     }
 212
 213     tcep = tcet->table + (ioba >> SPAPR_TCE_PAGE_SHIFT);
 214     tcep->tce = tce;
 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                       DMAContext *iommu)
 281 {
 282     if (!iommu) {
 283         return 0;
 284     }
 285
 286     if (iommu->translate == spapr_tce_translate) {
 287         sPAPRTCETable *tcet = DO_UPCAST(sPAPRTCETable, dma, iommu);
 288         return spapr_dma_dt(fdt, node_off, propname,
 289                 tcet->liobn, 0, tcet->window_size);
 290     }
 291
 292     return -1;
 293 }