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qemu-e2k/hw/ppc/spapr_rtas.c
Sam bobroff 3b50d8974b spapr: Add RTAS sysparm SPLPAR Characteristics 
Add support for the SPLPAR Characteristics parameter to the emulated
RTAS call ibm,get-system-parameter.

The support provides just enough information to allow "cat
/proc/powerpc/lparcfg" to succeed without generating a kernel error
message.

Without this patch the above command will produce the following kernel
message: arch/powerpc/platforms/pseries/lparcfg.c \
parse_system_parameter_string Error calling get-system-parameter \
(0xfffffffd)

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2014-06-27 13:48:26 +02:00

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/*
* QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
*
* Hypercall based emulated RTAS
*
* Copyright (c) 2010-2011 David Gibson, IBM Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#include "cpu.h"
#include "sysemu/sysemu.h"
#include "sysemu/char.h"
#include "hw/qdev.h"
#include "sysemu/device_tree.h"
#include "hw/ppc/spapr.h"
#include "hw/ppc/spapr_vio.h"
#include "qapi-event.h"
#include <libfdt.h>
static void rtas_display_character(PowerPCCPU *cpu, sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
uint8_t c = rtas_ld(args, 0);
VIOsPAPRDevice *sdev = vty_lookup(spapr, 0);
if (!sdev) {
rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
} else {
vty_putchars(sdev, &c, sizeof(c));
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
}
}
static void rtas_get_time_of_day(PowerPCCPU *cpu, sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
struct tm tm;
if (nret != 8) {
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return;
}
qemu_get_timedate(&tm, spapr->rtc_offset);
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
rtas_st(rets, 1, tm.tm_year + 1900);
rtas_st(rets, 2, tm.tm_mon + 1);
rtas_st(rets, 3, tm.tm_mday);
rtas_st(rets, 4, tm.tm_hour);
rtas_st(rets, 5, tm.tm_min);
rtas_st(rets, 6, tm.tm_sec);
rtas_st(rets, 7, 0); /* we don't do nanoseconds */
}
static void rtas_set_time_of_day(PowerPCCPU *cpu, sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
struct tm tm;
tm.tm_year = rtas_ld(args, 0) - 1900;
tm.tm_mon = rtas_ld(args, 1) - 1;
tm.tm_mday = rtas_ld(args, 2);
tm.tm_hour = rtas_ld(args, 3);
tm.tm_min = rtas_ld(args, 4);
tm.tm_sec = rtas_ld(args, 5);
/* Just generate a monitor event for the change */
qapi_event_send_rtc_change(qemu_timedate_diff(&tm), &error_abort);
spapr->rtc_offset = qemu_timedate_diff(&tm);
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
}
static void rtas_power_off(PowerPCCPU *cpu, sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs, target_ulong args,
uint32_t nret, target_ulong rets)
{
if (nargs != 2 || nret != 1) {
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return;
}
qemu_system_shutdown_request();
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
}
static void rtas_system_reboot(PowerPCCPU *cpu, sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
if (nargs != 0 || nret != 1) {
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return;
}
qemu_system_reset_request();
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
}
static void rtas_query_cpu_stopped_state(PowerPCCPU *cpu_,
sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
target_ulong id;
PowerPCCPU *cpu;
if (nargs != 1 || nret != 2) {
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return;
}
id = rtas_ld(args, 0);
cpu = ppc_get_vcpu_by_dt_id(id);
if (cpu != NULL) {
if (CPU(cpu)->halted) {
rtas_st(rets, 1, 0);
} else {
rtas_st(rets, 1, 2);
}
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
return;
}
/* Didn't find a matching cpu */
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
}
static void rtas_start_cpu(PowerPCCPU *cpu_, sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
target_ulong id, start, r3;
PowerPCCPU *cpu;
if (nargs != 3 || nret != 1) {
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return;
}
id = rtas_ld(args, 0);
start = rtas_ld(args, 1);
r3 = rtas_ld(args, 2);
cpu = ppc_get_vcpu_by_dt_id(id);
if (cpu != NULL) {
CPUState *cs = CPU(cpu);
CPUPPCState *env = &cpu->env;
if (!cs->halted) {
rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
return;
}
/* This will make sure qemu state is up to date with kvm, and
* mark it dirty so our changes get flushed back before the
* new cpu enters */
kvm_cpu_synchronize_state(cs);
env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
env->nip = start;
env->gpr[3] = r3;
cs->halted = 0;
qemu_cpu_kick(cs);
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
return;
}
/* Didn't find a matching cpu */
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
}
static void rtas_stop_self(PowerPCCPU *cpu, sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
CPUState *cs = CPU(cpu);
CPUPPCState *env = &cpu->env;
cs->halted = 1;
cpu_exit(cs);
/*
* While stopping a CPU, the guest calls H_CPPR which
* effectively disables interrupts on XICS level.
* However decrementer interrupts in TCG can still
* wake the CPU up so here we disable interrupts in MSR
* as well.
* As rtas_start_cpu() resets the whole MSR anyway, there is
* no need to bother with specific bits, we just clear it.
*/
env->msr = 0;
}
static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu,
sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
target_ulong parameter = rtas_ld(args, 0);
target_ulong buffer = rtas_ld(args, 1);
target_ulong length = rtas_ld(args, 2);
target_ulong ret = RTAS_OUT_SUCCESS;
switch (parameter) {
case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: {
char *param_val = g_strdup_printf("MaxEntCap=%d,MaxPlatProcs=%d",
max_cpus, smp_cpus);
rtas_st_buffer(buffer, length, (uint8_t *)param_val, strlen(param_val));
g_free(param_val);
break;
}
case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: {
uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED;
rtas_st_buffer(buffer, length, &param_val, sizeof(param_val));
break;
}
case RTAS_SYSPARM_UUID:
rtas_st_buffer(buffer, length, qemu_uuid, (qemu_uuid_set ? 16 : 0));
break;
default:
ret = RTAS_OUT_NOT_SUPPORTED;
}
rtas_st(rets, 0, ret);
}
static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu,
sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
target_ulong parameter = rtas_ld(args, 0);
target_ulong ret = RTAS_OUT_NOT_SUPPORTED;
switch (parameter) {
case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS:
case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE:
case RTAS_SYSPARM_UUID:
ret = RTAS_OUT_NOT_AUTHORIZED;
break;
}
rtas_st(rets, 0, ret);
}
static struct rtas_call {
const char *name;
spapr_rtas_fn fn;
} rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE];
target_ulong spapr_rtas_call(PowerPCCPU *cpu, sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs, target_ulong args,
uint32_t nret, target_ulong rets)
{
if ((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)) {
struct rtas_call *call = rtas_table + (token - RTAS_TOKEN_BASE);
if (call->fn) {
call->fn(cpu, spapr, token, nargs, args, nret, rets);
return H_SUCCESS;
}
}
/* HACK: Some Linux early debug code uses RTAS display-character,
* but assumes the token value is 0xa (which it is on some real
* machines) without looking it up in the device tree. This
* special case makes this work */
if (token == 0xa) {
rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets);
return H_SUCCESS;
}
hcall_dprintf("Unknown RTAS token 0x%x\n", token);
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return H_PARAMETER;
}
void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn)
{
if (!((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX))) {
fprintf(stderr, "RTAS invalid token 0x%x\n", token);
exit(1);
}
token -= RTAS_TOKEN_BASE;
if (rtas_table[token].name) {
fprintf(stderr, "RTAS call \"%s\" is registered already as 0x%x\n",
rtas_table[token].name, token);
exit(1);
}
rtas_table[token].name = name;
rtas_table[token].fn = fn;
}
int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
hwaddr rtas_size)
{
int ret;
int i;
ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
if (ret < 0) {
fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
fdt_strerror(ret));
return ret;
}
ret = qemu_fdt_setprop_cell(fdt, "/rtas", "linux,rtas-base",
rtas_addr);
if (ret < 0) {
fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
fdt_strerror(ret));
return ret;
}
ret = qemu_fdt_setprop_cell(fdt, "/rtas", "linux,rtas-entry",
rtas_addr);
if (ret < 0) {
fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
fdt_strerror(ret));
return ret;
}
ret = qemu_fdt_setprop_cell(fdt, "/rtas", "rtas-size",
rtas_size);
if (ret < 0) {
fprintf(stderr, "Couldn't add rtas-size property: %s\n",
fdt_strerror(ret));
return ret;
}
for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) {
struct rtas_call *call = &rtas_table[i];
if (!call->name) {
continue;
}
ret = qemu_fdt_setprop_cell(fdt, "/rtas", call->name,
i + RTAS_TOKEN_BASE);
if (ret < 0) {
fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
call->name, fdt_strerror(ret));
return ret;
}
}
return 0;
}
static void core_rtas_register_types(void)
{
spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character",
rtas_display_character);
spapr_rtas_register(RTAS_GET_TIME_OF_DAY, "get-time-of-day",
rtas_get_time_of_day);
spapr_rtas_register(RTAS_SET_TIME_OF_DAY, "set-time-of-day",
rtas_set_time_of_day);
spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off);
spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot",
rtas_system_reboot);
spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state",
rtas_query_cpu_stopped_state);
spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu);
spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self);
spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER,
"ibm,get-system-parameter",
rtas_ibm_get_system_parameter);
spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER,
"ibm,set-system-parameter",
rtas_ibm_set_system_parameter);
}
type_init(core_rtas_register_types)
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