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 "qemu/error-report.h"
  22 #include "qemu/module.h"
  23 #include "hw/ppc/spapr.h"
  24 #include "hw/pci-host/spapr.h"
  25 #include "trace.h"
  26
  27 static int spapr_phb_get_active_win_num_cb(Object *child, void *opaque)
  28 {
  29     SpaprTceTable *tcet;
  30
  31     tcet = (SpaprTceTable *) object_dynamic_cast(child, TYPE_SPAPR_TCE_TABLE);
  32     if (tcet && tcet->nb_table) {
  33         ++*(unsigned *)opaque;
  34     }
  35     return 0;
  36 }
  37
  38 static unsigned spapr_phb_get_active_win_num(SpaprPhbState *sphb)
  39 {
  40     unsigned ret = 0;
  41
  42     object_child_foreach(OBJECT(sphb), spapr_phb_get_active_win_num_cb, &ret);
  43
  44     return ret;
  45 }
  46
  47 static int spapr_phb_get_free_liobn_cb(Object *child, void *opaque)
  48 {
  49     SpaprTceTable *tcet;
  50
  51     tcet = (SpaprTceTable *) object_dynamic_cast(child, TYPE_SPAPR_TCE_TABLE);
  52     if (tcet && !tcet->nb_table) {
  53         *(uint32_t *)opaque = tcet->liobn;
  54         return 1;
  55     }
  56     return 0;
  57 }
  58
  59 static unsigned spapr_phb_get_free_liobn(SpaprPhbState *sphb)
  60 {
  61     uint32_t liobn = 0;
  62
  63     object_child_foreach(OBJECT(sphb), spapr_phb_get_free_liobn_cb, &liobn);
  64
  65     return liobn;
  66 }
  67
  68 static uint32_t spapr_page_mask_to_query_mask(uint64_t page_mask)
  69 {
  70     int i;
  71     uint32_t mask = 0;
  72     const struct { int shift; uint32_t mask; } masks[] = {
  73         { 12, RTAS_DDW_PGSIZE_4K },
  74         { 16, RTAS_DDW_PGSIZE_64K },
  75         { 21, RTAS_DDW_PGSIZE_2M },
  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) && (nret != 6))) {
 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     if (nret == 6) {
 122         /*
 123          * Set the Max TCE number as 1<<(58-21) = 0x20.0000.0000
 124          * 1<<59 is the huge window start and 21 is 2M page shift.
 125          */
 126         rtas_st(rets, 2, 0x00000020);
 127         rtas_st(rets, 3, 0x00000000);
 128         rtas_st(rets, 4, pgmask);
 129         rtas_st(rets, 5, 0); /* DMA migration mask, not supported */
 130     } else {
 131         rtas_st(rets, 2, 0x80000000);
 132         rtas_st(rets, 3, pgmask);
 133         rtas_st(rets, 4, 0); /* DMA migration mask, not supported */
 134     }
 135
 136     trace_spapr_iommu_ddw_query(buid, addr, avail, 0x80000000, pgmask);
 137     return;
 138
 139 param_error_exit:
 140     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 141 }
 142
 143 static void rtas_ibm_create_pe_dma_window(PowerPCCPU *cpu,
 144                                           SpaprMachineState *spapr,
 145                                           uint32_t token, uint32_t nargs,
 146                                           target_ulong args,
 147                                           uint32_t nret, target_ulong rets)
 148 {
 149     SpaprPhbState *sphb;
 150     SpaprTceTable *tcet = NULL;
 151     uint32_t addr, page_shift, window_shift, liobn;
 152     uint64_t buid, win_addr;
 153     int windows;
 154
 155     if ((nargs != 5) || (nret != 4)) {
 156         goto param_error_exit;
 157     }
 158
 159     buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 160     addr = rtas_ld(args, 0);
 161     sphb = spapr_pci_find_phb(spapr, buid);
 162     if (!sphb || !sphb->ddw_enabled) {
 163         goto param_error_exit;
 164     }
 165
 166     page_shift = rtas_ld(args, 3);
 167     window_shift = rtas_ld(args, 4);
 168     liobn = spapr_phb_get_free_liobn(sphb);
 169     windows = spapr_phb_get_active_win_num(sphb);
 170
 171     if (!(sphb->page_size_mask & (1ULL << page_shift)) ||
 172         (window_shift < page_shift)) {
 173         goto param_error_exit;
 174     }
 175
 176     if (!liobn || !sphb->ddw_enabled || windows == SPAPR_PCI_DMA_MAX_WINDOWS) {
 177         goto hw_error_exit;
 178     }
 179
 180     tcet = spapr_tce_find_by_liobn(liobn);
 181     if (!tcet) {
 182         goto hw_error_exit;
 183     }
 184
 185     win_addr = (windows == 0) ? sphb->dma_win_addr : sphb->dma64_win_addr;
 186     /*
 187      * We have just created a window, we know for the fact that it is empty,
 188      * use a hack to avoid iterating over the table as it is quite possible
 189      * to have billions of TCEs, all empty.
 190      * Note that we cannot delay this to the first H_PUT_TCE as this hcall is
 191      * mostly likely to be handled in KVM so QEMU just does not know if it
 192      * happened.
 193      */
 194     tcet->skipping_replay = true;
 195     spapr_tce_table_enable(tcet, page_shift, win_addr,
 196                            1ULL << (window_shift - page_shift));
 197     tcet->skipping_replay = false;
 198     if (!tcet->nb_table) {
 199         goto hw_error_exit;
 200     }
 201
 202     trace_spapr_iommu_ddw_create(buid, addr, 1ULL << page_shift,
 203                                  1ULL << window_shift, tcet->bus_offset, liobn);
 204
 205     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 206     rtas_st(rets, 1, liobn);
 207     rtas_st(rets, 2, tcet->bus_offset >> 32);
 208     rtas_st(rets, 3, tcet->bus_offset & ((uint32_t) -1));
 209
 210     return;
 211
 212 hw_error_exit:
 213     rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 214     return;
 215
 216 param_error_exit:
 217     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 218 }
 219
 220 static void rtas_ibm_remove_pe_dma_window(PowerPCCPU *cpu,
 221                                           SpaprMachineState *spapr,
 222                                           uint32_t token, uint32_t nargs,
 223                                           target_ulong args,
 224                                           uint32_t nret, target_ulong rets)
 225 {
 226     SpaprPhbState *sphb;
 227     SpaprTceTable *tcet;
 228     uint32_t liobn;
 229     bool def_win_removed;
 230
 231     if ((nargs != 1) || (nret != 1)) {
 232         goto param_error_exit;
 233     }
 234
 235     liobn = rtas_ld(args, 0);
 236     tcet = spapr_tce_find_by_liobn(liobn);
 237     if (!tcet) {
 238         goto param_error_exit;
 239     }
 240
 241     sphb = SPAPR_PCI_HOST_BRIDGE(OBJECT(tcet)->parent);
 242     if (!sphb || !sphb->ddw_enabled || !tcet->nb_table) {
 243         goto param_error_exit;
 244     }
 245
 246     def_win_removed = tcet->def_win;
 247     spapr_tce_table_disable(tcet);
 248     trace_spapr_iommu_ddw_remove(liobn);
 249
 250     /*
 251      * PAPR+/LoPAPR says:
 252      * The platform must restore the default DMA window for the PE on a call
 253      * to the ibm,remove-pe-dma-window RTAS call when all of the following
 254      * are true:
 255      * a. The call removes the last DMA window remaining for the PE.
 256      * b. The DMA window being removed is not the default window
 257      */
 258     if (spapr_phb_get_active_win_num(sphb) == 0 && !def_win_removed) {
 259         spapr_phb_dma_reset(sphb);
 260         trace_spapr_iommu_ddw_reset(sphb->buid, 0);
 261     }
 262
 263     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 264     return;
 265
 266 param_error_exit:
 267     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 268 }
 269
 270 static void rtas_ibm_reset_pe_dma_window(PowerPCCPU *cpu,
 271                                          SpaprMachineState *spapr,
 272                                          uint32_t token, uint32_t nargs,
 273                                          target_ulong args,
 274                                          uint32_t nret, target_ulong rets)
 275 {
 276     SpaprPhbState *sphb;
 277     uint64_t buid;
 278     uint32_t addr;
 279
 280     if ((nargs != 3) || (nret != 1)) {
 281         goto param_error_exit;
 282     }
 283
 284     buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 285     addr = rtas_ld(args, 0);
 286     sphb = spapr_pci_find_phb(spapr, buid);
 287     if (!sphb || !sphb->ddw_enabled) {
 288         goto param_error_exit;
 289     }
 290
 291     spapr_phb_dma_reset(sphb);
 292     trace_spapr_iommu_ddw_reset(buid, addr);
 293
 294     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 295
 296     return;
 297
 298 param_error_exit:
 299     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 300 }
 301
 302 static void spapr_rtas_ddw_init(void)
 303 {
 304     spapr_rtas_register(RTAS_IBM_QUERY_PE_DMA_WINDOW,
 305                         "ibm,query-pe-dma-window",
 306                         rtas_ibm_query_pe_dma_window);
 307     spapr_rtas_register(RTAS_IBM_CREATE_PE_DMA_WINDOW,
 308                         "ibm,create-pe-dma-window",
 309                         rtas_ibm_create_pe_dma_window);
 310     spapr_rtas_register(RTAS_IBM_REMOVE_PE_DMA_WINDOW,
 311                         "ibm,remove-pe-dma-window",
 312                         rtas_ibm_remove_pe_dma_window);
 313     spapr_rtas_register(RTAS_IBM_RESET_PE_DMA_WINDOW,
 314                         "ibm,reset-pe-dma-window",
 315                         rtas_ibm_reset_pe_dma_window);
 316 }
 317
 318 type_init(spapr_rtas_ddw_init)