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qemu/hw/ppc/pnv_bmc.c

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/*
* QEMU PowerNV, BMC related functions
*
* Copyright (c) 2016-2017, IBM Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qapi/error.h"
#include "target/ppc/cpu.h"
#include "qemu/log.h"
#include "hw/ipmi/ipmi.h"
#include "hw/ppc/fdt.h"
#include "hw/ppc/pnv.h"
#include <libfdt.h>
/* TODO: include definition in ipmi.h */
#define IPMI_SDR_FULL_TYPE 1
/*
* OEM SEL Event data packet sent by BMC in response of a Read Event
* Message Buffer command
*/
typedef struct OemSel {
/* SEL header */
uint8_t id[2];
uint8_t type;
uint8_t timestamp[4];
uint8_t manuf_id[3];
/* OEM SEL data (6 bytes) follows */
uint8_t netfun;
uint8_t cmd;
uint8_t data[4];
} OemSel;
#define SOFT_OFF 0x00
#define SOFT_REBOOT 0x01
static void pnv_gen_oem_sel(IPMIBmc *bmc, uint8_t reboot)
{
/* IPMI SEL Event are 16 bytes long */
OemSel sel = {
.id = { 0x55 , 0x55 },
.type = 0xC0, /* OEM */
.manuf_id = { 0x0, 0x0, 0x0 },
.timestamp = { 0x0, 0x0, 0x0, 0x0 },
.netfun = 0x3A, /* IBM */
.cmd = 0x04, /* AMI OEM SEL Power Notification */
.data = { reboot, 0xFF, 0xFF, 0xFF },
};
ipmi_bmc_gen_event(bmc, (uint8_t *) &sel, 0 /* do not log the event */);
}
void pnv_bmc_powerdown(IPMIBmc *bmc)
{
pnv_gen_oem_sel(bmc, SOFT_OFF);
}
void pnv_dt_bmc_sensors(IPMIBmc *bmc, void *fdt)
{
int offset;
int i;
const struct ipmi_sdr_compact *sdr;
uint16_t nextrec;
offset = fdt_add_subnode(fdt, 0, "bmc");
_FDT(offset);
_FDT((fdt_setprop_string(fdt, offset, "name", "bmc")));
offset = fdt_add_subnode(fdt, offset, "sensors");
_FDT(offset);
_FDT((fdt_setprop_cell(fdt, offset, "#address-cells", 0x1)));
_FDT((fdt_setprop_cell(fdt, offset, "#size-cells", 0x0)));
for (i = 0; !ipmi_bmc_sdr_find(bmc, i, &sdr, &nextrec); i++) {
int off;
char *name;
if (sdr->header.rec_type != IPMI_SDR_COMPACT_TYPE &&
sdr->header.rec_type != IPMI_SDR_FULL_TYPE) {
continue;
}
name = g_strdup_printf("sensor@%x", sdr->sensor_owner_number);
off = fdt_add_subnode(fdt, offset, name);
_FDT(off);
g_free(name);
_FDT((fdt_setprop_cell(fdt, off, "reg", sdr->sensor_owner_number)));
_FDT((fdt_setprop_string(fdt, off, "name", "sensor")));
_FDT((fdt_setprop_string(fdt, off, "compatible", "ibm,ipmi-sensor")));
_FDT((fdt_setprop_cell(fdt, off, "ipmi-sensor-reading-type",
sdr->reading_type)));
_FDT((fdt_setprop_cell(fdt, off, "ipmi-entity-id",
sdr->entity_id)));
_FDT((fdt_setprop_cell(fdt, off, "ipmi-entity-instance",
sdr->entity_instance)));
_FDT((fdt_setprop_cell(fdt, off, "ipmi-sensor-type",
sdr->sensor_type)));
}
}
/*
* HIOMAP protocol handler
*/
#define HIOMAP_C_RESET 1
#define HIOMAP_C_GET_INFO 2
#define HIOMAP_C_GET_FLASH_INFO 3
#define HIOMAP_C_CREATE_READ_WINDOW 4
#define HIOMAP_C_CLOSE_WINDOW 5
#define HIOMAP_C_CREATE_WRITE_WINDOW 6
#define HIOMAP_C_MARK_DIRTY 7
#define HIOMAP_C_FLUSH 8
#define HIOMAP_C_ACK 9
#define HIOMAP_C_ERASE 10
#define HIOMAP_C_DEVICE_NAME 11
#define HIOMAP_C_LOCK 12
#define BLOCK_SHIFT 12 /* 4K */
static uint16_t bytes_to_blocks(uint32_t bytes)
{
return bytes >> BLOCK_SHIFT;
}
static uint32_t blocks_to_bytes(uint16_t blocks)
{
return blocks << BLOCK_SHIFT;
}
static int hiomap_erase(PnvPnor *pnor, uint32_t offset, uint32_t size)
{
MemTxResult result;
int i;
for (i = 0; i < size / 4; i++) {
result = memory_region_dispatch_write(&pnor->mmio, offset + i * 4,
0xFFFFFFFF, MO_32,
MEMTXATTRS_UNSPECIFIED);
if (result != MEMTX_OK) {
return -1;
}
}
return 0;
}
static void hiomap_cmd(IPMIBmcSim *ibs, uint8_t *cmd, unsigned int cmd_len,
RspBuffer *rsp)
{
PnvPnor *pnor = PNV_PNOR(object_property_get_link(OBJECT(ibs), "pnor",
&error_abort));
uint32_t pnor_size = pnor->size;
uint32_t pnor_addr = PNOR_SPI_OFFSET;
bool readonly = false;
rsp_buffer_push(rsp, cmd[2]);
rsp_buffer_push(rsp, cmd[3]);
switch (cmd[2]) {
case HIOMAP_C_MARK_DIRTY:
case HIOMAP_C_FLUSH:
case HIOMAP_C_ACK:
break;
case HIOMAP_C_ERASE:
if (hiomap_erase(pnor, blocks_to_bytes(cmd[5] << 8 | cmd[4]),
blocks_to_bytes(cmd[7] << 8 | cmd[6]))) {
rsp_buffer_set_error(rsp, IPMI_CC_UNSPECIFIED);
}
break;
case HIOMAP_C_GET_INFO:
rsp_buffer_push(rsp, 2); /* Version 2 */
rsp_buffer_push(rsp, BLOCK_SHIFT); /* block size */
rsp_buffer_push(rsp, 0); /* Timeout */
rsp_buffer_push(rsp, 0); /* Timeout */
break;
case HIOMAP_C_GET_FLASH_INFO:
rsp_buffer_push(rsp, bytes_to_blocks(pnor_size) & 0xFF);
rsp_buffer_push(rsp, bytes_to_blocks(pnor_size) >> 8);
rsp_buffer_push(rsp, 0x01); /* erase size */
rsp_buffer_push(rsp, 0x00); /* erase size */
break;
case HIOMAP_C_CREATE_READ_WINDOW:
readonly = true;
/* Fall through */
case HIOMAP_C_CREATE_WRITE_WINDOW:
memory_region_set_readonly(&pnor->mmio, readonly);
memory_region_set_enabled(&pnor->mmio, true);
rsp_buffer_push(rsp, bytes_to_blocks(pnor_addr) & 0xFF);
rsp_buffer_push(rsp, bytes_to_blocks(pnor_addr) >> 8);
rsp_buffer_push(rsp, bytes_to_blocks(pnor_size) & 0xFF);
rsp_buffer_push(rsp, bytes_to_blocks(pnor_size) >> 8);
rsp_buffer_push(rsp, 0x00); /* offset */
rsp_buffer_push(rsp, 0x00); /* offset */
break;
case HIOMAP_C_CLOSE_WINDOW:
memory_region_set_enabled(&pnor->mmio, false);
break;
case HIOMAP_C_DEVICE_NAME:
case HIOMAP_C_RESET:
case HIOMAP_C_LOCK:
default:
qemu_log_mask(LOG_GUEST_ERROR, "HIOMAP: unknow command %02X\n", cmd[2]);
break;
}
}
#define HIOMAP 0x5a
static const IPMICmdHandler hiomap_cmds[] = {
[HIOMAP] = { hiomap_cmd, 3 },
};
static const IPMINetfn hiomap_netfn = {
.cmd_nums = ARRAY_SIZE(hiomap_cmds),
.cmd_handlers = hiomap_cmds
};
void pnv_bmc_set_pnor(IPMIBmc *bmc, PnvPnor *pnor)
{
object_ref(OBJECT(pnor));
object_property_add_const_link(OBJECT(bmc), "pnor", OBJECT(pnor));
/* Install the HIOMAP protocol handlers to access the PNOR */
ipmi_sim_register_netfn(IPMI_BMC_SIMULATOR(bmc), IPMI_NETFN_OEM,
&hiomap_netfn);
}
/*
* Instantiate the machine BMC. PowerNV uses the QEMU internal
* simulator but it could also be external.
*/
IPMIBmc *pnv_bmc_create(PnvPnor *pnor)
{
Object *obj;
obj = object_new(TYPE_IPMI_BMC_SIMULATOR);
object_ref(OBJECT(pnor));
object_property_add_const_link(obj, "pnor", OBJECT(pnor));
qdev_realize(DEVICE(obj), NULL, &error_fatal);
/* Install the HIOMAP protocol handlers to access the PNOR */
ipmi_sim_register_netfn(IPMI_BMC_SIMULATOR(obj), IPMI_NETFN_OEM,
&hiomap_netfn);
return IPMI_BMC(obj);
}
typedef struct ForeachArgs {
const char *name;
Object *obj;
} ForeachArgs;
static int bmc_find(Object *child, void *opaque)
{
ForeachArgs *args = opaque;
if (object_dynamic_cast(child, args->name)) {
if (args->obj) {
return 1;
}
args->obj = child;
}
return 0;
}
IPMIBmc *pnv_bmc_find(Error **errp)
{
ForeachArgs args = { TYPE_IPMI_BMC_SIMULATOR, NULL };
int ret;
ret = object_child_foreach_recursive(object_get_root(), bmc_find, &args);
if (ret) {
error_setg(errp, "machine should have only one BMC device. "
"Use '-nodefaults'");
return NULL;
}
return args.obj ? IPMI_BMC(args.obj) : NULL;
}
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