LXR qemu/hw/ppc/spapr_rtas

   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
  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;
 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
 127param_error_exit:
 128    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 129}
 130
 131static 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
 200hw_error_exit:
 201    rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 202    return;
 203
 204param_error_exit:
 205    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 206}
 207
 208static 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
 239param_error_exit:
 240    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 241}
 242
 243static 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
 271param_error_exit:
 272    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 273}
 274
 275static 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
 291type_init(spapr_rtas_ddw_init)
 292