qemu/hw/ppc/spapr_rtas_ddw.c
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   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
  27static 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
  38static 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
  47static 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
  59static 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
  68static 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
  92static 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        MemoryHotplugState *hpms = &spapr->hotplug_memory;
 126
 127        max_window_size = hpms->base + memory_region_size(&hpms->mr);
 128    }
 129
 130    avail = SPAPR_PCI_DMA_MAX_WINDOWS - spapr_phb_get_active_win_num(sphb);
 131
 132    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 133    rtas_st(rets, 1, avail);
 134    rtas_st(rets, 2, max_window_size >> SPAPR_TCE_PAGE_SHIFT);
 135    rtas_st(rets, 3, pgmask);
 136    rtas_st(rets, 4, 0); /* DMA migration mask, not supported */
 137
 138    trace_spapr_iommu_ddw_query(buid, addr, avail, max_window_size, pgmask);
 139    return;
 140
 141param_error_exit:
 142    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 143}
 144
 145static void rtas_ibm_create_pe_dma_window(PowerPCCPU *cpu,
 146                                          sPAPRMachineState *spapr,
 147                                          uint32_t token, uint32_t nargs,
 148                                          target_ulong args,
 149                                          uint32_t nret, target_ulong rets)
 150{
 151    sPAPRPHBState *sphb;
 152    sPAPRTCETable *tcet = NULL;
 153    uint32_t addr, page_shift, window_shift, liobn;
 154    uint64_t buid, win_addr;
 155    int windows;
 156
 157    if ((nargs != 5) || (nret != 4)) {
 158        goto param_error_exit;
 159    }
 160
 161    buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 162    addr = rtas_ld(args, 0);
 163    sphb = spapr_pci_find_phb(spapr, buid);
 164    if (!sphb || !sphb->ddw_enabled) {
 165        goto param_error_exit;
 166    }
 167
 168    page_shift = rtas_ld(args, 3);
 169    window_shift = rtas_ld(args, 4);
 170    liobn = spapr_phb_get_free_liobn(sphb);
 171    windows = spapr_phb_get_active_win_num(sphb);
 172
 173    if (!(sphb->page_size_mask & (1ULL << page_shift)) ||
 174        (window_shift < page_shift)) {
 175        goto param_error_exit;
 176    }
 177
 178    if (!liobn || !sphb->ddw_enabled || windows == SPAPR_PCI_DMA_MAX_WINDOWS) {
 179        goto hw_error_exit;
 180    }
 181
 182    tcet = spapr_tce_find_by_liobn(liobn);
 183    if (!tcet) {
 184        goto hw_error_exit;
 185    }
 186
 187    win_addr = (windows == 0) ? sphb->dma_win_addr : sphb->dma64_win_addr;
 188    spapr_tce_table_enable(tcet, page_shift, win_addr,
 189                           1ULL << (window_shift - page_shift));
 190    if (!tcet->nb_table) {
 191        goto hw_error_exit;
 192    }
 193
 194    trace_spapr_iommu_ddw_create(buid, addr, 1ULL << page_shift,
 195                                 1ULL << window_shift, tcet->bus_offset, liobn);
 196
 197    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 198    rtas_st(rets, 1, liobn);
 199    rtas_st(rets, 2, tcet->bus_offset >> 32);
 200    rtas_st(rets, 3, tcet->bus_offset & ((uint32_t) -1));
 201
 202    return;
 203
 204hw_error_exit:
 205    rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 206    return;
 207
 208param_error_exit:
 209    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 210}
 211
 212static void rtas_ibm_remove_pe_dma_window(PowerPCCPU *cpu,
 213                                          sPAPRMachineState *spapr,
 214                                          uint32_t token, uint32_t nargs,
 215                                          target_ulong args,
 216                                          uint32_t nret, target_ulong rets)
 217{
 218    sPAPRPHBState *sphb;
 219    sPAPRTCETable *tcet;
 220    uint32_t liobn;
 221
 222    if ((nargs != 1) || (nret != 1)) {
 223        goto param_error_exit;
 224    }
 225
 226    liobn = rtas_ld(args, 0);
 227    tcet = spapr_tce_find_by_liobn(liobn);
 228    if (!tcet) {
 229        goto param_error_exit;
 230    }
 231
 232    sphb = SPAPR_PCI_HOST_BRIDGE(OBJECT(tcet)->parent);
 233    if (!sphb || !sphb->ddw_enabled || !tcet->nb_table) {
 234        goto param_error_exit;
 235    }
 236
 237    spapr_tce_table_disable(tcet);
 238    trace_spapr_iommu_ddw_remove(liobn);
 239
 240    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 241    return;
 242
 243param_error_exit:
 244    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 245}
 246
 247static void rtas_ibm_reset_pe_dma_window(PowerPCCPU *cpu,
 248                                         sPAPRMachineState *spapr,
 249                                         uint32_t token, uint32_t nargs,
 250                                         target_ulong args,
 251                                         uint32_t nret, target_ulong rets)
 252{
 253    sPAPRPHBState *sphb;
 254    uint64_t buid;
 255    uint32_t addr;
 256
 257    if ((nargs != 3) || (nret != 1)) {
 258        goto param_error_exit;
 259    }
 260
 261    buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2);
 262    addr = rtas_ld(args, 0);
 263    sphb = spapr_pci_find_phb(spapr, buid);
 264    if (!sphb || !sphb->ddw_enabled) {
 265        goto param_error_exit;
 266    }
 267
 268    spapr_phb_dma_reset(sphb);
 269    trace_spapr_iommu_ddw_reset(buid, addr);
 270
 271    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 272
 273    return;
 274
 275param_error_exit:
 276    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 277}
 278
 279static void spapr_rtas_ddw_init(void)
 280{
 281    spapr_rtas_register(RTAS_IBM_QUERY_PE_DMA_WINDOW,
 282                        "ibm,query-pe-dma-window",
 283                        rtas_ibm_query_pe_dma_window);
 284    spapr_rtas_register(RTAS_IBM_CREATE_PE_DMA_WINDOW,
 285                        "ibm,create-pe-dma-window",
 286                        rtas_ibm_create_pe_dma_window);
 287    spapr_rtas_register(RTAS_IBM_REMOVE_PE_DMA_WINDOW,
 288                        "ibm,remove-pe-dma-window",
 289                        rtas_ibm_remove_pe_dma_window);
 290    spapr_rtas_register(RTAS_IBM_RESET_PE_DMA_WINDOW,
 291                        "ibm,reset-pe-dma-window",
 292                        rtas_ibm_reset_pe_dma_window);
 293}
 294
 295type_init(spapr_rtas_ddw_init)
 296