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qemu/hw/ppc/spapr_rtas.c
Suraj Jitindar Singh 289af4ac99 powerpc/spapr: Add host threads parameter to ibm,get_system_parameter 
The ibm,get_system_parameter rtas call is used by the guest to retrieve
data relating to certain parameters of the system. The SPLPAR
characteristics option (token 20) is used to determine characteristics of
the environment in which the lpar will run.

It may be useful for a guest to know the number of physical host threads
present on the underlying system where it is being run. Add the
characteristic "HostThrs" to the SPLPAR Characteristics
ibm,get_system_parameter rtas call to expose this information to a
guest. Add a n_host_threads property to the processor class which is
then used to retrieve this information and define it for POWER8 and
POWER9. Other processors will default to 0 and the charateristic won't
be added.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>

Message-Id: <20190827045751.22123-1-sjitindarsingh@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2019-08-29 09:46:07 +10:00

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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 "qemu/osdep.h"
#include "cpu.h"
#include "qemu/log.h"
#include "qemu/error-report.h"
#include "sysemu/sysemu.h"
#include "sysemu/device_tree.h"
#include "sysemu/cpus.h"
#include "sysemu/hw_accel.h"
#include "sysemu/runstate.h"
#include "kvm_ppc.h"
#include "hw/ppc/spapr.h"
#include "hw/ppc/spapr_vio.h"
#include "hw/ppc/spapr_rtas.h"
#include "hw/ppc/spapr_cpu_core.h"
#include "hw/ppc/ppc.h"
#include "hw/boards.h"
#include <libfdt.h>
#include "hw/ppc/spapr_drc.h"
#include "qemu/cutils.h"
#include "trace.h"
#include "hw/ppc/fdt.h"
#include "target/ppc/mmu-hash64.h"
#include "target/ppc/mmu-book3s-v3.h"
static void rtas_display_character(PowerPCCPU *cpu, SpaprMachineState *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
uint8_t c = rtas_ld(args, 0);
SpaprVioDevice *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_power_off(PowerPCCPU *cpu, SpaprMachineState *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(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
cpu_stop_current();
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
}
static void rtas_system_reboot(PowerPCCPU *cpu, SpaprMachineState *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(SHUTDOWN_CAUSE_GUEST_RESET);
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
}
static void rtas_query_cpu_stopped_state(PowerPCCPU *cpu_,
SpaprMachineState *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 = spapr_find_cpu(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 *callcpu, SpaprMachineState *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
target_ulong id, start, r3;
PowerPCCPU *newcpu;
CPUPPCState *env;
PowerPCCPUClass *pcc;
target_ulong lpcr;
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);
newcpu = spapr_find_cpu(id);
if (!newcpu) {
/* Didn't find a matching cpu */
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return;
}
env = &newcpu->env;
pcc = POWERPC_CPU_GET_CLASS(newcpu);
if (!CPU(newcpu)->halted) {
rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
return;
}
cpu_synchronize_state(CPU(newcpu));
env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
/* Enable Power-saving mode Exit Cause exceptions for the new CPU */
lpcr = env->spr[SPR_LPCR];
if (!pcc->interrupts_big_endian(callcpu)) {
lpcr |= LPCR_ILE;
}
if (env->mmu_model == POWERPC_MMU_3_00) {
/*
* New cpus are expected to start in the same radix/hash mode
* as the existing CPUs
*/
if (ppc64_v3_radix(callcpu)) {
lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR;
} else {
lpcr &= ~(LPCR_UPRT | LPCR_GTSE | LPCR_HR);
}
env->spr[SPR_PSSCR] &= ~PSSCR_EC;
}
ppc_store_lpcr(newcpu, lpcr);
/*
* Set the timebase offset of the new CPU to that of the invoking
* CPU. This helps hotplugged CPU to have the correct timebase
* offset.
*/
newcpu->env.tb_env->tb_offset = callcpu->env.tb_env->tb_offset;
spapr_cpu_set_entry_state(newcpu, start, r3);
qemu_cpu_kick(CPU(newcpu));
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
}
static void rtas_stop_self(PowerPCCPU *cpu, SpaprMachineState *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
CPUState *cs = CPU(cpu);
CPUPPCState *env = &cpu->env;
PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
/* Disable Power-saving mode Exit Cause exceptions for the CPU.
* This could deliver an interrupt on a dying CPU and crash the
* guest.
* For the same reason, set PSSCR_EC.
*/
ppc_store_lpcr(cpu, env->spr[SPR_LPCR] & ~pcc->lpcr_pm);
env->spr[SPR_PSSCR] |= PSSCR_EC;
cs->halted = 1;
kvmppc_set_reg_ppc_online(cpu, 0);
qemu_cpu_kick(cs);
}
static void rtas_ibm_suspend_me(PowerPCCPU *cpu, SpaprMachineState *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
CPUState *cs;
if (nargs != 0 || nret != 1) {
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return;
}
CPU_FOREACH(cs) {
PowerPCCPU *c = POWERPC_CPU(cs);
CPUPPCState *e = &c->env;
if (c == cpu) {
continue;
}
/* See h_join */
if (!cs->halted || (e->msr & (1ULL << MSR_EE))) {
rtas_st(rets, 0, H_MULTI_THREADS_ACTIVE);
return;
}
}
qemu_system_suspend_request();
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
}
static inline int sysparm_st(target_ulong addr, target_ulong len,
const void *val, uint16_t vallen)
{
hwaddr phys = ppc64_phys_to_real(addr);
if (len < 2) {
return RTAS_OUT_SYSPARM_PARAM_ERROR;
}
stw_be_phys(&address_space_memory, phys, vallen);
cpu_physical_memory_write(phys + 2, val, MIN(len - 2, vallen));
return RTAS_OUT_SUCCESS;
}
static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu,
SpaprMachineState *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
MachineState *ms = MACHINE(qdev_get_machine());
unsigned int max_cpus = ms->smp.max_cpus;
target_ulong parameter = rtas_ld(args, 0);
target_ulong buffer = rtas_ld(args, 1);
target_ulong length = rtas_ld(args, 2);
target_ulong ret;
switch (parameter) {
case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: {
char *param_val = g_strdup_printf("MaxEntCap=%d,"
"DesMem=%" PRIu64 ","
"DesProcs=%d,"
"MaxPlatProcs=%d",
max_cpus,
current_machine->ram_size / MiB,
ms->smp.cpus,
max_cpus);
if (pcc->n_host_threads > 0) {
char *hostthr_val, *old = param_val;
/*
* Add HostThrs property. This property is not present in PAPR but
* is expected by some guests to communicate the number of physical
* host threads per core on the system so that they can scale
* information which varies based on the thread configuration.
*/
hostthr_val = g_strdup_printf(",HostThrs=%d", pcc->n_host_threads);
param_val = g_strconcat(param_val, hostthr_val, NULL);
g_free(hostthr_val);
g_free(old);
}
ret = sysparm_st(buffer, length, param_val, strlen(param_val) + 1);
g_free(param_val);
break;
}
case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: {
uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED;
ret = sysparm_st(buffer, length, &param_val, sizeof(param_val));
break;
}
case RTAS_SYSPARM_UUID:
ret = sysparm_st(buffer, length, (unsigned char *)&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,
SpaprMachineState *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 void rtas_ibm_os_term(PowerPCCPU *cpu,
SpaprMachineState *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
qemu_system_guest_panicked(NULL);
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
}
static void rtas_set_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr,
uint32_t token, uint32_t nargs,
target_ulong args, uint32_t nret,
target_ulong rets)
{
int32_t power_domain;
if (nargs != 2 || nret != 2) {
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return;
}
/* we currently only use a single, "live insert" powerdomain for
* hotplugged/dlpar'd resources, so the power is always live/full (100)
*/
power_domain = rtas_ld(args, 0);
if (power_domain != -1) {
rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
return;
}
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
rtas_st(rets, 1, 100);
}
static void rtas_get_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr,
uint32_t token, uint32_t nargs,
target_ulong args, uint32_t nret,
target_ulong rets)
{
int32_t power_domain;
if (nargs != 1 || nret != 2) {
rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
return;
}
/* we currently only use a single, "live insert" powerdomain for
* hotplugged/dlpar'd resources, so the power is always live/full (100)
*/
power_domain = rtas_ld(args, 0);
if (power_domain != -1) {
rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
return;
}
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
rtas_st(rets, 1, 100);
}
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, SpaprMachineState *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;
}
uint64_t qtest_rtas_call(char *cmd, uint32_t nargs, uint64_t args,
uint32_t nret, uint64_t rets)
{
int token;
for (token = 0; token < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; token++) {
if (strcmp(cmd, rtas_table[token].name) == 0) {
SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
rtas_table[token].fn(cpu, spapr, token + RTAS_TOKEN_BASE,
nargs, args, nret, rets);
return H_SUCCESS;
}
}
return H_PARAMETER;
}
void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn)
{
assert((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX));
token -= RTAS_TOKEN_BASE;
assert(!name || !rtas_table[token].name);
rtas_table[token].name = name;
rtas_table[token].fn = fn;
}
void spapr_dt_rtas_tokens(void *fdt, int rtas)
{
int i;
for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) {
struct rtas_call *call = &rtas_table[i];
if (!call->name) {
continue;
}
_FDT(fdt_setprop_cell(fdt, rtas, call->name, i + RTAS_TOKEN_BASE));
}
}
void spapr_load_rtas(SpaprMachineState *spapr, void *fdt, hwaddr addr)
{
int rtas_node;
int ret;
/* Copy RTAS blob into guest RAM */
cpu_physical_memory_write(addr, spapr->rtas_blob, spapr->rtas_size);
ret = fdt_add_mem_rsv(fdt, addr, spapr->rtas_size);
if (ret < 0) {
error_report("Couldn't add RTAS reserve entry: %s",
fdt_strerror(ret));
exit(1);
}
/* Update the device tree with the blob's location */
rtas_node = fdt_path_offset(fdt, "/rtas");
assert(rtas_node >= 0);
ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-base", addr);
if (ret < 0) {
error_report("Couldn't add linux,rtas-base property: %s",
fdt_strerror(ret));
exit(1);
}
ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-entry", addr);
if (ret < 0) {
error_report("Couldn't add linux,rtas-entry property: %s",
fdt_strerror(ret));
exit(1);
}
ret = fdt_setprop_cell(fdt, rtas_node, "rtas-size", spapr->rtas_size);
if (ret < 0) {
error_report("Couldn't add rtas-size property: %s",
fdt_strerror(ret));
exit(1);
}
}
static void core_rtas_register_types(void)
{
spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character",
rtas_display_character);
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_SUSPEND_ME, "ibm,suspend-me",
rtas_ibm_suspend_me);
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);
spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term",
rtas_ibm_os_term);
spapr_rtas_register(RTAS_SET_POWER_LEVEL, "set-power-level",
rtas_set_power_level);
spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level",
rtas_get_power_level);
}
type_init(core_rtas_register_types)
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