LXR qemu/hw/ppc/pnv

   1/*
   2 * QEMU PowerNV, BMC related functions
   3 *
   4 * Copyright (c) 2016-2017, 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, version 2, as
   8 * published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19#include "qemu/osdep.h"
  20#include "qemu-common.h"
  21#include "qapi/error.h"
  22#include "target/ppc/cpu.h"
  23#include "qemu/log.h"
  24#include "hw/ipmi/ipmi.h"
  25#include "hw/ppc/fdt.h"
  26
  27#include "hw/ppc/pnv.h"
  28
  29#include <libfdt.h>
  30
  31/* TODO: include definition in ipmi.h */
  32#define IPMI_SDR_FULL_TYPE 1
  33
  34/*
  35 * OEM SEL Event data packet sent by BMC in response of a Read Event
  36 * Message Buffer command
  37 */
  38typedef struct OemSel {
  39    /* SEL header */
  40    uint8_t id[2];
  41    uint8_t type;
  42    uint8_t timestamp[4];
  43    uint8_t manuf_id[3];
  44
  45    /* OEM SEL data (6 bytes) follows */
  46    uint8_t netfun;
  47    uint8_t cmd;
  48    uint8_t data[4];
  49} OemSel;
  50
  51#define SOFT_OFF        0x00
  52#define SOFT_REBOOT     0x01
  53
  54static void pnv_gen_oem_sel(IPMIBmc *bmc, uint8_t reboot)
  55{
  56    /* IPMI SEL Event are 16 bytes long */
  57    OemSel sel = {
  58        .id        = { 0x55 , 0x55 },
  59        .type      = 0xC0, /* OEM */
  60        .manuf_id  = { 0x0, 0x0, 0x0 },
  61        .timestamp = { 0x0, 0x0, 0x0, 0x0 },
  62        .netfun    = 0x3A, /* IBM */
  63        .cmd       = 0x04, /* AMI OEM SEL Power Notification */
  64        .data      = { reboot, 0xFF, 0xFF, 0xFF },
  65    };
  66
  67    ipmi_bmc_gen_event(bmc, (uint8_t *) &sel, 0 /* do not log the event */);
  68}
  69
  70void pnv_bmc_powerdown(IPMIBmc *bmc)
  71{
  72    pnv_gen_oem_sel(bmc, SOFT_OFF);
  73}
  74
  75void pnv_dt_bmc_sensors(IPMIBmc *bmc, void *fdt)
  76{
  77    int offset;
  78    int i;
  79    const struct ipmi_sdr_compact *sdr;
  80    uint16_t nextrec;
  81
  82    offset = fdt_add_subnode(fdt, 0, "bmc");
  83    _FDT(offset);
  84
  85    _FDT((fdt_setprop_string(fdt, offset, "name", "bmc")));
  86    offset = fdt_add_subnode(fdt, offset, "sensors");
  87    _FDT(offset);
  88
  89    _FDT((fdt_setprop_cell(fdt, offset, "#address-cells", 0x1)));
  90    _FDT((fdt_setprop_cell(fdt, offset, "#size-cells", 0x0)));
  91
  92    for (i = 0; !ipmi_bmc_sdr_find(bmc, i, &sdr, &nextrec); i++) {
  93        int off;
  94        char *name;
  95
  96        if (sdr->header.rec_type != IPMI_SDR_COMPACT_TYPE &&
  97            sdr->header.rec_type != IPMI_SDR_FULL_TYPE) {
  98            continue;
  99        }
 100
 101        name = g_strdup_printf("sensor@%x", sdr->sensor_owner_number);
 102        off = fdt_add_subnode(fdt, offset, name);
 103        _FDT(off);
 104        g_free(name);
 105
 106        _FDT((fdt_setprop_cell(fdt, off, "reg", sdr->sensor_owner_number)));
 107        _FDT((fdt_setprop_string(fdt, off, "name", "sensor")));
 108        _FDT((fdt_setprop_string(fdt, off, "compatible", "ibm,ipmi-sensor")));
 109        _FDT((fdt_setprop_cell(fdt, off, "ipmi-sensor-reading-type",
 110                               sdr->reading_type)));
 111        _FDT((fdt_setprop_cell(fdt, off, "ipmi-entity-id",
 112                               sdr->entity_id)));
 113        _FDT((fdt_setprop_cell(fdt, off, "ipmi-entity-instance",
 114                               sdr->entity_instance)));
 115        _FDT((fdt_setprop_cell(fdt, off, "ipmi-sensor-type",
 116                               sdr->sensor_type)));
 117    }
 118}
 119
 120/*
 121 * HIOMAP protocol handler
 122 */
 123#define HIOMAP_C_RESET                  1
 124#define HIOMAP_C_GET_INFO               2
 125#define HIOMAP_C_GET_FLASH_INFO         3
 126#define HIOMAP_C_CREATE_READ_WINDOW     4
 127#define HIOMAP_C_CLOSE_WINDOW           5
 128#define HIOMAP_C_CREATE_WRITE_WINDOW    6
 129#define HIOMAP_C_MARK_DIRTY             7
 130#define HIOMAP_C_FLUSH                  8
 131#define HIOMAP_C_ACK                    9
 132#define HIOMAP_C_ERASE                  10
 133#define HIOMAP_C_DEVICE_NAME            11
 134#define HIOMAP_C_LOCK                   12
 135
 136#define BLOCK_SHIFT                     12 /* 4K */
 137
 138static uint16_t bytes_to_blocks(uint32_t bytes)
 139{
 140    return bytes >> BLOCK_SHIFT;
 141}
 142
 143static void hiomap_cmd(IPMIBmcSim *ibs, uint8_t *cmd, unsigned int cmd_len,
 144                       RspBuffer *rsp)
 145{
 146    PnvPnor *pnor = PNV_PNOR(object_property_get_link(OBJECT(ibs), "pnor",
 147                                                      &error_abort));
 148    uint32_t pnor_size = pnor->size;
 149    uint32_t pnor_addr = PNOR_SPI_OFFSET;
 150    bool readonly = false;
 151
 152    rsp_buffer_push(rsp, cmd[2]);
 153    rsp_buffer_push(rsp, cmd[3]);
 154
 155    switch (cmd[2]) {
 156    case HIOMAP_C_MARK_DIRTY:
 157    case HIOMAP_C_FLUSH:
 158    case HIOMAP_C_ERASE:
 159    case HIOMAP_C_ACK:
 160        break;
 161
 162    case HIOMAP_C_GET_INFO:
 163        rsp_buffer_push(rsp, 2);  /* Version 2 */
 164        rsp_buffer_push(rsp, BLOCK_SHIFT); /* block size */
 165        rsp_buffer_push(rsp, 0);  /* Timeout */
 166        rsp_buffer_push(rsp, 0);  /* Timeout */
 167        break;
 168
 169    case HIOMAP_C_GET_FLASH_INFO:
 170        rsp_buffer_push(rsp, bytes_to_blocks(pnor_size) & 0xFF);
 171        rsp_buffer_push(rsp, bytes_to_blocks(pnor_size) >> 8);
 172        rsp_buffer_push(rsp, 0x01);  /* erase size */
 173        rsp_buffer_push(rsp, 0x00);  /* erase size */
 174        break;
 175
 176    case HIOMAP_C_CREATE_READ_WINDOW:
 177        readonly = true;
 178        /* Fall through */
 179
 180    case HIOMAP_C_CREATE_WRITE_WINDOW:
 181        memory_region_set_readonly(&pnor->mmio, readonly);
 182        memory_region_set_enabled(&pnor->mmio, true);
 183
 184        rsp_buffer_push(rsp, bytes_to_blocks(pnor_addr) & 0xFF);
 185        rsp_buffer_push(rsp, bytes_to_blocks(pnor_addr) >> 8);
 186        rsp_buffer_push(rsp, bytes_to_blocks(pnor_size) & 0xFF);
 187        rsp_buffer_push(rsp, bytes_to_blocks(pnor_size) >> 8);
 188        rsp_buffer_push(rsp, 0x00); /* offset */
 189        rsp_buffer_push(rsp, 0x00); /* offset */
 190        break;
 191
 192    case HIOMAP_C_CLOSE_WINDOW:
 193        memory_region_set_enabled(&pnor->mmio, false);
 194        break;
 195
 196    case HIOMAP_C_DEVICE_NAME:
 197    case HIOMAP_C_RESET:
 198    case HIOMAP_C_LOCK:
 199    default:
 200        qemu_log_mask(LOG_GUEST_ERROR, "HIOMAP: unknow command %02X\n", cmd[2]);
 201        break;
 202    }
 203}
 204
 205#define HIOMAP   0x5a
 206
 207static const IPMICmdHandler hiomap_cmds[] = {
 208    [HIOMAP] = { hiomap_cmd, 3 },
 209};
 210
 211static const IPMINetfn hiomap_netfn = {
 212    .cmd_nums = ARRAY_SIZE(hiomap_cmds),
 213    .cmd_handlers = hiomap_cmds
 214};
 215
 216
 217void pnv_bmc_set_pnor(IPMIBmc *bmc, PnvPnor *pnor)
 218{
 219    object_ref(OBJECT(pnor));
 220    object_property_add_const_link(OBJECT(bmc), "pnor", OBJECT(pnor),
 221                                   &error_abort);
 222
 223    /* Install the HIOMAP protocol handlers to access the PNOR */
 224    ipmi_sim_register_netfn(IPMI_BMC_SIMULATOR(bmc), IPMI_NETFN_OEM,
 225                            &hiomap_netfn);
 226}
 227
 228/*
 229 * Instantiate the machine BMC. PowerNV uses the QEMU internal
 230 * simulator but it could also be external.
 231 */
 232IPMIBmc *pnv_bmc_create(PnvPnor *pnor)
 233{
 234    Object *obj;
 235
 236    obj = object_new(TYPE_IPMI_BMC_SIMULATOR);
 237    object_ref(OBJECT(pnor));
 238    object_property_add_const_link(obj, "pnor", OBJECT(pnor), &error_abort);
 239    object_property_set_bool(obj, true, "realized", &error_fatal);
 240
 241    /* Install the HIOMAP protocol handlers to access the PNOR */
 242    ipmi_sim_register_netfn(IPMI_BMC_SIMULATOR(obj), IPMI_NETFN_OEM,
 243                            &hiomap_netfn);
 244
 245    return IPMI_BMC(obj);
 246}
 247
 248typedef struct ForeachArgs {
 249    const char *name;
 250    Object *obj;
 251} ForeachArgs;
 252
 253static int bmc_find(Object *child, void *opaque)
 254{
 255    ForeachArgs *args = opaque;
 256
 257    if (object_dynamic_cast(child, args->name)) {
 258        if (args->obj) {
 259            return 1;
 260        }
 261        args->obj = child;
 262    }
 263    return 0;
 264}
 265
 266IPMIBmc *pnv_bmc_find(Error **errp)
 267{
 268    ForeachArgs args = { TYPE_IPMI_BMC_SIMULATOR, NULL };
 269    int ret;
 270
 271    ret = object_child_foreach_recursive(object_get_root(), bmc_find, &args);
 272    if (ret) {
 273        error_setg(errp, "machine should have only one BMC device. "
 274                   "Use '-nodefaults'");
 275        return NULL;
 276    }
 277
 278    return args.obj ? IPMI_BMC(args.obj) : NULL;
 279}
 280