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, max_window_size;
 100     uint32_t avail, addr, pgmask = 0;
 101     MachineState *machine = MACHINE(spapr);
 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     /*
 118      * This is "Largest contiguous block of TCEs allocated specifically
 119      * for (that is, are reserved for) this PE".
 120      * Return the maximum number as maximum supported RAM size was in 4K pages.
 121      */
 122     if (machine->ram_size == machine->maxram_size) {
 123         max_window_size = machine->ram_size;
 124     } else {
 125         max_window_size = machine->device_memory->base +
 126                           memory_region_size(&machine->device_memory->mr);
 127     }
 128
 129     avail = SPAPR_PCI_DMA_MAX_WINDOWS - spapr_phb_get_active_win_num(sphb);
 130
 131     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 132     rtas_st(rets, 1, avail);
 133     rtas_st(rets, 2, max_window_size >> SPAPR_TCE_PAGE_SHIFT);
 134     rtas_st(rets, 3, pgmask);
 135     rtas_st(rets, 4, 0); /* DMA migration mask, not supported */
 136
 137     trace_spapr_iommu_ddw_query(buid, addr, avail, max_window_size, pgmask);
 138     return;
 139
 140 param_error_exit:
 141     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 142 }
 143
 144 static void rtas_ibm_create_pe_dma_window(PowerPCCPU *cpu,
 145                                           sPAPRMachineState *spapr,
 146                                           uint32_t token, uint32_t nargs,
 147                                           target_ulong args,
 148                                           uint32_t nret, target_ulong rets)
 149 {
 150     sPAPRPHBState *sphb;
 151     sPAPRTCETable *tcet = NULL;
 152     uint32_t addr, page_shift, window_shift, liobn;
 153     uint64_t buid, win_addr;
 154     int windows;
 155
 156     if ((nargs != 5) || (nret != 4)) {
 157         goto param_error_exit;
 158     }
 159
 160     buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 161     addr = rtas_ld(args, 0);
 162     sphb = spapr_pci_find_phb(spapr, buid);
 163     if (!sphb || !sphb->ddw_enabled) {
 164         goto param_error_exit;
 165     }
 166
 167     page_shift = rtas_ld(args, 3);
 168     window_shift = rtas_ld(args, 4);
 169     liobn = spapr_phb_get_free_liobn(sphb);
 170     windows = spapr_phb_get_active_win_num(sphb);
 171
 172     if (!(sphb->page_size_mask & (1ULL << page_shift)) ||
 173         (window_shift < page_shift)) {
 174         goto param_error_exit;
 175     }
 176
 177     if (!liobn || !sphb->ddw_enabled || windows == SPAPR_PCI_DMA_MAX_WINDOWS) {
 178         goto hw_error_exit;
 179     }
 180
 181     tcet = spapr_tce_find_by_liobn(liobn);
 182     if (!tcet) {
 183         goto hw_error_exit;
 184     }
 185
 186     win_addr = (windows == 0) ? sphb->dma_win_addr : sphb->dma64_win_addr;
 187     spapr_tce_table_enable(tcet, page_shift, win_addr,
 188                            1ULL << (window_shift - page_shift));
 189     if (!tcet->nb_table) {
 190         goto hw_error_exit;
 191     }
 192
 193     trace_spapr_iommu_ddw_create(buid, addr, 1ULL << page_shift,
 194                                  1ULL << window_shift, tcet->bus_offset, liobn);
 195
 196     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 197     rtas_st(rets, 1, liobn);
 198     rtas_st(rets, 2, tcet->bus_offset >> 32);
 199     rtas_st(rets, 3, tcet->bus_offset & ((uint32_t) -1));
 200
 201     return;
 202
 203 hw_error_exit:
 204     rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 205     return;
 206
 207 param_error_exit:
 208     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 209 }
 210
 211 static void rtas_ibm_remove_pe_dma_window(PowerPCCPU *cpu,
 212                                           sPAPRMachineState *spapr,
 213                                           uint32_t token, uint32_t nargs,
 214                                           target_ulong args,
 215                                           uint32_t nret, target_ulong rets)
 216 {
 217     sPAPRPHBState *sphb;
 218     sPAPRTCETable *tcet;
 219     uint32_t liobn;
 220
 221     if ((nargs != 1) || (nret != 1)) {
 222         goto param_error_exit;
 223     }
 224
 225     liobn = rtas_ld(args, 0);
 226     tcet = spapr_tce_find_by_liobn(liobn);
 227     if (!tcet) {
 228         goto param_error_exit;
 229     }
 230
 231     sphb = SPAPR_PCI_HOST_BRIDGE(OBJECT(tcet)->parent);
 232     if (!sphb || !sphb->ddw_enabled || !tcet->nb_table) {
 233         goto param_error_exit;
 234     }
 235
 236     spapr_tce_table_disable(tcet);
 237     trace_spapr_iommu_ddw_remove(liobn);
 238
 239     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 240     return;
 241
 242 param_error_exit:
 243     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 244 }
 245
 246 static void rtas_ibm_reset_pe_dma_window(PowerPCCPU *cpu,
 247                                          sPAPRMachineState *spapr,
 248                                          uint32_t token, uint32_t nargs,
 249                                          target_ulong args,
 250                                          uint32_t nret, target_ulong rets)
 251 {
 252     sPAPRPHBState *sphb;
 253     uint64_t buid;
 254     uint32_t addr;
 255
 256     if ((nargs != 3) || (nret != 1)) {
 257         goto param_error_exit;
 258     }
 259
 260     buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 261     addr = rtas_ld(args, 0);
 262     sphb = spapr_pci_find_phb(spapr, buid);
 263     if (!sphb || !sphb->ddw_enabled) {
 264         goto param_error_exit;
 265     }
 266
 267     spapr_phb_dma_reset(sphb);
 268     trace_spapr_iommu_ddw_reset(buid, addr);
 269
 270     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 271
 272     return;
 273
 274 param_error_exit:
 275     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 276 }
 277
 278 static void spapr_rtas_ddw_init(void)
 279 {
 280     spapr_rtas_register(RTAS_IBM_QUERY_PE_DMA_WINDOW,
 281                         "ibm,query-pe-dma-window",
 282                         rtas_ibm_query_pe_dma_window);
 283     spapr_rtas_register(RTAS_IBM_CREATE_PE_DMA_WINDOW,
 284                         "ibm,create-pe-dma-window",
 285                         rtas_ibm_create_pe_dma_window);
 286     spapr_rtas_register(RTAS_IBM_REMOVE_PE_DMA_WINDOW,
 287                         "ibm,remove-pe-dma-window",
 288                         rtas_ibm_remove_pe_dma_window);
 289     spapr_rtas_register(RTAS_IBM_RESET_PE_DMA_WINDOW,
 290                         "ibm,reset-pe-dma-window",
 291                         rtas_ibm_reset_pe_dma_window);
 292 }
 293
 294 type_init(spapr_rtas_ddw_init)