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        { 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
  93static 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
 139param_error_exit:
 140    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 141}
 142
 143static 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
 212hw_error_exit:
 213    rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 214    return;
 215
 216param_error_exit:
 217    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 218}
 219
 220static 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
 266param_error_exit:
 267    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 268}
 269
 270static 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
 298param_error_exit:
 299    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 300}
 301
 302static 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
 318type_init(spapr_rtas_ddw_init)
 319