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 "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         { 24, RTAS_DDW_PGSIZE_16M },
  76         { 25, RTAS_DDW_PGSIZE_32M },
  77         { 26, RTAS_DDW_PGSIZE_64M },
  78         { 27, RTAS_DDW_PGSIZE_128M },
  79         { 28, RTAS_DDW_PGSIZE_256M },
  80         { 34, RTAS_DDW_PGSIZE_16G },
  81     };
  82
  83     for (i = 0; i < ARRAY_SIZE(masks); ++i) {
  84         if (page_mask & (1ULL << masks[i].shift)) {
  85             mask |= masks[i].mask;
  86         }
  87     }
  88
  89     return mask;
  90 }
  91
  92 static void rtas_ibm_query_pe_dma_window(PowerPCCPU *cpu,
  93                                          SpaprMachineState *spapr,
  94                                          uint32_t token, uint32_t nargs,
  95                                          target_ulong args,
  96                                          uint32_t nret, target_ulong rets)
  97 {
  98     SpaprPhbState *sphb;
  99     uint64_t buid;
 100     uint32_t avail, addr, pgmask = 0;
 101
 102     if ((nargs != 3) || (nret != 5)) {
 103         goto param_error_exit;
 104     }
 105
 106     buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 107     addr = rtas_ld(args, 0);
 108     sphb = spapr_pci_find_phb(spapr, buid);
 109     if (!sphb || !sphb->ddw_enabled) {
 110         goto param_error_exit;
 111     }
 112
 113     /* Translate page mask to LoPAPR format */
 114     pgmask = spapr_page_mask_to_query_mask(sphb->page_size_mask);
 115
 116     avail = SPAPR_PCI_DMA_MAX_WINDOWS - spapr_phb_get_active_win_num(sphb);
 117
 118     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 119     rtas_st(rets, 1, avail);
 120     rtas_st(rets, 2, 0x80000000); /* The largest window we can possibly have */
 121     rtas_st(rets, 3, pgmask);
 122     rtas_st(rets, 4, 0); /* DMA migration mask, not supported */
 123
 124     trace_spapr_iommu_ddw_query(buid, addr, avail, 0x80000000, pgmask);
 125     return;
 126
 127 param_error_exit:
 128     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 129 }
 130
 131 static void rtas_ibm_create_pe_dma_window(PowerPCCPU *cpu,
 132                                           SpaprMachineState *spapr,
 133                                           uint32_t token, uint32_t nargs,
 134                                           target_ulong args,
 135                                           uint32_t nret, target_ulong rets)
 136 {
 137     SpaprPhbState *sphb;
 138     SpaprTceTable *tcet = NULL;
 139     uint32_t addr, page_shift, window_shift, liobn;
 140     uint64_t buid, win_addr;
 141     int windows;
 142
 143     if ((nargs != 5) || (nret != 4)) {
 144         goto param_error_exit;
 145     }
 146
 147     buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 148     addr = rtas_ld(args, 0);
 149     sphb = spapr_pci_find_phb(spapr, buid);
 150     if (!sphb || !sphb->ddw_enabled) {
 151         goto param_error_exit;
 152     }
 153
 154     page_shift = rtas_ld(args, 3);
 155     window_shift = rtas_ld(args, 4);
 156     liobn = spapr_phb_get_free_liobn(sphb);
 157     windows = spapr_phb_get_active_win_num(sphb);
 158
 159     if (!(sphb->page_size_mask & (1ULL << page_shift)) ||
 160         (window_shift < page_shift)) {
 161         goto param_error_exit;
 162     }
 163
 164     if (!liobn || !sphb->ddw_enabled || windows == SPAPR_PCI_DMA_MAX_WINDOWS) {
 165         goto hw_error_exit;
 166     }
 167
 168     tcet = spapr_tce_find_by_liobn(liobn);
 169     if (!tcet) {
 170         goto hw_error_exit;
 171     }
 172
 173     win_addr = (windows == 0) ? sphb->dma_win_addr : sphb->dma64_win_addr;
 174     /*
 175      * We have just created a window, we know for the fact that it is empty,
 176      * use a hack to avoid iterating over the table as it is quite possible
 177      * to have billions of TCEs, all empty.
 178      * Note that we cannot delay this to the first H_PUT_TCE as this hcall is
 179      * mostly likely to be handled in KVM so QEMU just does not know if it
 180      * happened.
 181      */
 182     tcet->skipping_replay = true;
 183     spapr_tce_table_enable(tcet, page_shift, win_addr,
 184                            1ULL << (window_shift - page_shift));
 185     tcet->skipping_replay = false;
 186     if (!tcet->nb_table) {
 187         goto hw_error_exit;
 188     }
 189
 190     trace_spapr_iommu_ddw_create(buid, addr, 1ULL << page_shift,
 191                                  1ULL << window_shift, tcet->bus_offset, liobn);
 192
 193     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 194     rtas_st(rets, 1, liobn);
 195     rtas_st(rets, 2, tcet->bus_offset >> 32);
 196     rtas_st(rets, 3, tcet->bus_offset & ((uint32_t) -1));
 197
 198     return;
 199
 200 hw_error_exit:
 201     rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 202     return;
 203
 204 param_error_exit:
 205     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 206 }
 207
 208 static void rtas_ibm_remove_pe_dma_window(PowerPCCPU *cpu,
 209                                           SpaprMachineState *spapr,
 210                                           uint32_t token, uint32_t nargs,
 211                                           target_ulong args,
 212                                           uint32_t nret, target_ulong rets)
 213 {
 214     SpaprPhbState *sphb;
 215     SpaprTceTable *tcet;
 216     uint32_t liobn;
 217
 218     if ((nargs != 1) || (nret != 1)) {
 219         goto param_error_exit;
 220     }
 221
 222     liobn = rtas_ld(args, 0);
 223     tcet = spapr_tce_find_by_liobn(liobn);
 224     if (!tcet) {
 225         goto param_error_exit;
 226     }
 227
 228     sphb = SPAPR_PCI_HOST_BRIDGE(OBJECT(tcet)->parent);
 229     if (!sphb || !sphb->ddw_enabled || !tcet->nb_table) {
 230         goto param_error_exit;
 231     }
 232
 233     spapr_tce_table_disable(tcet);
 234     trace_spapr_iommu_ddw_remove(liobn);
 235
 236     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 237     return;
 238
 239 param_error_exit:
 240     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 241 }
 242
 243 static void rtas_ibm_reset_pe_dma_window(PowerPCCPU *cpu,
 244                                          SpaprMachineState *spapr,
 245                                          uint32_t token, uint32_t nargs,
 246                                          target_ulong args,
 247                                          uint32_t nret, target_ulong rets)
 248 {
 249     SpaprPhbState *sphb;
 250     uint64_t buid;
 251     uint32_t addr;
 252
 253     if ((nargs != 3) || (nret != 1)) {
 254         goto param_error_exit;
 255     }
 256
 257     buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 258     addr = rtas_ld(args, 0);
 259     sphb = spapr_pci_find_phb(spapr, buid);
 260     if (!sphb || !sphb->ddw_enabled) {
 261         goto param_error_exit;
 262     }
 263
 264     spapr_phb_dma_reset(sphb);
 265     trace_spapr_iommu_ddw_reset(buid, addr);
 266
 267     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 268
 269     return;
 270
 271 param_error_exit:
 272     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 273 }
 274
 275 static void spapr_rtas_ddw_init(void)
 276 {
 277     spapr_rtas_register(RTAS_IBM_QUERY_PE_DMA_WINDOW,
 278                         "ibm,query-pe-dma-window",
 279                         rtas_ibm_query_pe_dma_window);
 280     spapr_rtas_register(RTAS_IBM_CREATE_PE_DMA_WINDOW,
 281                         "ibm,create-pe-dma-window",
 282                         rtas_ibm_create_pe_dma_window);
 283     spapr_rtas_register(RTAS_IBM_REMOVE_PE_DMA_WINDOW,
 284                         "ibm,remove-pe-dma-window",
 285                         rtas_ibm_remove_pe_dma_window);
 286     spapr_rtas_register(RTAS_IBM_RESET_PE_DMA_WINDOW,
 287                         "ibm,reset-pe-dma-window",
 288                         rtas_ibm_reset_pe_dma_window);
 289 }
 290
 291 type_init(spapr_rtas_ddw_init)