hw/ppc/spapr_rtas_ddw.c

   1 /*
   2  * QEMU sPAPR Dynamic DMA windows support
   3  *
   4  * Copyright (c) 2015 Alexey Kardashevskiy, IBM Corporation.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License,
   9  *  or (at your option) any later version.
  10  *
  11  *  This program 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
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "cpu.h"
  22 #include "qemu/error-report.h"
  23 #include "qemu/module.h"
  24 #include "hw/ppc/spapr.h"
  25 #include "hw/pci-host/spapr.h"
  26 #include "trace.h"
  27
  28 static int spapr_phb_get_active_win_num_cb(Object *child, void *opaque)
  29 {
  30     SpaprTceTable *tcet;
  31
  32     tcet = (SpaprTceTable *) object_dynamic_cast(child, TYPE_SPAPR_TCE_TABLE);
  33     if (tcet && tcet->nb_table) {
  34         ++*(unsigned *)opaque;
  35     }
  36     return 0;
  37 }
  38
  39 static unsigned spapr_phb_get_active_win_num(SpaprPhbState *sphb)
  40 {
  41     unsigned ret = 0;
  42
  43     object_child_foreach(OBJECT(sphb), spapr_phb_get_active_win_num_cb, &ret);
  44
  45     return ret;
  46 }
  47
  48 static int spapr_phb_get_free_liobn_cb(Object *child, void *opaque)
  49 {
  50     SpaprTceTable *tcet;
  51
  52     tcet = (SpaprTceTable *) object_dynamic_cast(child, TYPE_SPAPR_TCE_TABLE);
  53     if (tcet && !tcet->nb_table) {
  54         *(uint32_t *)opaque = tcet->liobn;
  55         return 1;
  56     }
  57     return 0;
  58 }
  59
  60 static unsigned spapr_phb_get_free_liobn(SpaprPhbState *sphb)
  61 {
  62     uint32_t liobn = 0;
  63
  64     object_child_foreach(OBJECT(sphb), spapr_phb_get_free_liobn_cb, &liobn);
  65
  66     return liobn;
  67 }
  68
  69 static uint32_t spapr_page_mask_to_query_mask(uint64_t page_mask)
  70 {
  71     int i;
  72     uint32_t mask = 0;
  73     const struct { int shift; uint32_t mask; } masks[] = {
  74         { 12, RTAS_DDW_PGSIZE_4K },
  75         { 16, RTAS_DDW_PGSIZE_64K },
  76         { 24, RTAS_DDW_PGSIZE_16M },
  77         { 25, RTAS_DDW_PGSIZE_32M },
  78         { 26, RTAS_DDW_PGSIZE_64M },
  79         { 27, RTAS_DDW_PGSIZE_128M },
  80         { 28, RTAS_DDW_PGSIZE_256M },
  81         { 34, RTAS_DDW_PGSIZE_16G },
  82     };
  83
  84     for (i = 0; i < ARRAY_SIZE(masks); ++i) {
  85         if (page_mask & (1ULL << masks[i].shift)) {
  86             mask |= masks[i].mask;
  87         }
  88     }
  89
  90     return mask;
  91 }
  92
  93 static void rtas_ibm_query_pe_dma_window(PowerPCCPU *cpu,
  94                                          SpaprMachineState *spapr,
  95                                          uint32_t token, uint32_t nargs,
  96                                          target_ulong args,
  97                                          uint32_t nret, target_ulong rets)
  98 {
  99     SpaprPhbState *sphb;
 100     uint64_t buid;
 101     uint32_t avail, addr, pgmask = 0;
 102
 103     if ((nargs != 3) || (nret != 5)) {
 104         goto param_error_exit;
 105     }
 106
 107     buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 108     addr = rtas_ld(args, 0);
 109     sphb = spapr_pci_find_phb(spapr, buid);
 110     if (!sphb || !sphb->ddw_enabled) {
 111         goto param_error_exit;
 112     }
 113
 114     /* Translate page mask to LoPAPR format */
 115     pgmask = spapr_page_mask_to_query_mask(sphb->page_size_mask);
 116
 117     avail = SPAPR_PCI_DMA_MAX_WINDOWS - spapr_phb_get_active_win_num(sphb);
 118
 119     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 120     rtas_st(rets, 1, avail);
 121     rtas_st(rets, 2, 0x80000000); /* The largest window we can possibly have */
 122     rtas_st(rets, 3, pgmask);
 123     rtas_st(rets, 4, 0); /* DMA migration mask, not supported */
 124
 125     trace_spapr_iommu_ddw_query(buid, addr, avail, 0x80000000, pgmask);
 126     return;
 127
 128 param_error_exit:
 129     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 130 }
 131
 132 static void rtas_ibm_create_pe_dma_window(PowerPCCPU *cpu,
 133                                           SpaprMachineState *spapr,
 134                                           uint32_t token, uint32_t nargs,
 135                                           target_ulong args,
 136                                           uint32_t nret, target_ulong rets)
 137 {
 138     SpaprPhbState *sphb;
 139     SpaprTceTable *tcet = NULL;
 140     uint32_t addr, page_shift, window_shift, liobn;
 141     uint64_t buid, win_addr;
 142     int windows;
 143
 144     if ((nargs != 5) || (nret != 4)) {
 145         goto param_error_exit;
 146     }
 147
 148     buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 149     addr = rtas_ld(args, 0);
 150     sphb = spapr_pci_find_phb(spapr, buid);
 151     if (!sphb || !sphb->ddw_enabled) {
 152         goto param_error_exit;
 153     }
 154
 155     page_shift = rtas_ld(args, 3);
 156     window_shift = rtas_ld(args, 4);
 157     liobn = spapr_phb_get_free_liobn(sphb);
 158     windows = spapr_phb_get_active_win_num(sphb);
 159
 160     if (!(sphb->page_size_mask & (1ULL << page_shift)) ||
 161         (window_shift < page_shift)) {
 162         goto param_error_exit;
 163     }
 164
 165     if (!liobn || !sphb->ddw_enabled || windows == SPAPR_PCI_DMA_MAX_WINDOWS) {
 166         goto hw_error_exit;
 167     }
 168
 169     tcet = spapr_tce_find_by_liobn(liobn);
 170     if (!tcet) {
 171         goto hw_error_exit;
 172     }
 173
 174     win_addr = (windows == 0) ? sphb->dma_win_addr : sphb->dma64_win_addr;
 175     /*
 176      * We have just created a window, we know for the fact that it is empty,
 177      * use a hack to avoid iterating over the table as it is quite possible
 178      * to have billions of TCEs, all empty.
 179      * Note that we cannot delay this to the first H_PUT_TCE as this hcall is
 180      * mostly likely to be handled in KVM so QEMU just does not know if it
 181      * happened.
 182      */
 183     tcet->skipping_replay = true;
 184     spapr_tce_table_enable(tcet, page_shift, win_addr,
 185                            1ULL << (window_shift - page_shift));
 186     tcet->skipping_replay = false;
 187     if (!tcet->nb_table) {
 188         goto hw_error_exit;
 189     }
 190
 191     trace_spapr_iommu_ddw_create(buid, addr, 1ULL << page_shift,
 192                                  1ULL << window_shift, tcet->bus_offset, liobn);
 193
 194     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 195     rtas_st(rets, 1, liobn);
 196     rtas_st(rets, 2, tcet->bus_offset >> 32);
 197     rtas_st(rets, 3, tcet->bus_offset & ((uint32_t) -1));
 198
 199     return;
 200
 201 hw_error_exit:
 202     rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 203     return;
 204
 205 param_error_exit:
 206     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 207 }
 208
 209 static void rtas_ibm_remove_pe_dma_window(PowerPCCPU *cpu,
 210                                           SpaprMachineState *spapr,
 211                                           uint32_t token, uint32_t nargs,
 212                                           target_ulong args,
 213                                           uint32_t nret, target_ulong rets)
 214 {
 215     SpaprPhbState *sphb;
 216     SpaprTceTable *tcet;
 217     uint32_t liobn;
 218
 219     if ((nargs != 1) || (nret != 1)) {
 220         goto param_error_exit;
 221     }
 222
 223     liobn = rtas_ld(args, 0);
 224     tcet = spapr_tce_find_by_liobn(liobn);
 225     if (!tcet) {
 226         goto param_error_exit;
 227     }
 228
 229     sphb = SPAPR_PCI_HOST_BRIDGE(OBJECT(tcet)->parent);
 230     if (!sphb || !sphb->ddw_enabled || !tcet->nb_table) {
 231         goto param_error_exit;
 232     }
 233
 234     spapr_tce_table_disable(tcet);
 235     trace_spapr_iommu_ddw_remove(liobn);
 236
 237     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 238     return;
 239
 240 param_error_exit:
 241     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 242 }
 243
 244 static void rtas_ibm_reset_pe_dma_window(PowerPCCPU *cpu,
 245                                          SpaprMachineState *spapr,
 246                                          uint32_t token, uint32_t nargs,
 247                                          target_ulong args,
 248                                          uint32_t nret, target_ulong rets)
 249 {
 250     SpaprPhbState *sphb;
 251     uint64_t buid;
 252     uint32_t addr;
 253
 254     if ((nargs != 3) || (nret != 1)) {
 255         goto param_error_exit;
 256     }
 257
 258     buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 259     addr = rtas_ld(args, 0);
 260     sphb = spapr_pci_find_phb(spapr, buid);
 261     if (!sphb || !sphb->ddw_enabled) {
 262         goto param_error_exit;
 263     }
 264
 265     spapr_phb_dma_reset(sphb);
 266     trace_spapr_iommu_ddw_reset(buid, addr);
 267
 268     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 269
 270     return;
 271
 272 param_error_exit:
 273     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 274 }
 275
 276 static void spapr_rtas_ddw_init(void)
 277 {
 278     spapr_rtas_register(RTAS_IBM_QUERY_PE_DMA_WINDOW,
 279                         "ibm,query-pe-dma-window",
 280                         rtas_ibm_query_pe_dma_window);
 281     spapr_rtas_register(RTAS_IBM_CREATE_PE_DMA_WINDOW,
 282                         "ibm,create-pe-dma-window",
 283                         rtas_ibm_create_pe_dma_window);
 284     spapr_rtas_register(RTAS_IBM_REMOVE_PE_DMA_WINDOW,
 285                         "ibm,remove-pe-dma-window",
 286                         rtas_ibm_remove_pe_dma_window);
 287     spapr_rtas_register(RTAS_IBM_RESET_PE_DMA_WINDOW,
 288                         "ibm,reset-pe-dma-window",
 289                         rtas_ibm_reset_pe_dma_window);
 290 }
 291
 292 type_init(spapr_rtas_ddw_init)