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slw.c
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slw.c
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/* Copyright 2013-2016 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Handle ChipTOD chip & configure core timebases
*/
#include <skiboot.h>
#include <xscom.h>
#include <io.h>
#include <cpu.h>
#include <chip.h>
#include <mem_region.h>
#include <chiptod.h>
#include <interrupts.h>
#include <timebase.h>
#include <errorlog.h>
#include <libfdt/libfdt.h>
#include <opal-api.h>
#include <p9_stop_api.H>
#include <p8_pore_table_gen_api.H>
#include <sbe_xip_image.h>
#define MAX_RESET_PATCH_SIZE 64
static uint32_t slw_saved_reset[MAX_RESET_PATCH_SIZE];
static bool slw_current_le = false;
/* SLW timer related stuff */
static bool slw_has_timer;
static uint64_t slw_timer_inc;
static uint64_t slw_timer_target;
static uint32_t slw_timer_chip;
static uint64_t slw_last_gen;
static uint64_t slw_last_gen_stamp;
DEFINE_LOG_ENTRY(OPAL_RC_SLW_INIT, OPAL_PLATFORM_ERR_EVT, OPAL_SLW,
OPAL_PLATFORM_FIRMWARE, OPAL_PREDICTIVE_ERR_GENERAL,
OPAL_NA);
DEFINE_LOG_ENTRY(OPAL_RC_SLW_SET, OPAL_PLATFORM_ERR_EVT, OPAL_SLW,
OPAL_PLATFORM_FIRMWARE, OPAL_INFO,
OPAL_NA);
DEFINE_LOG_ENTRY(OPAL_RC_SLW_GET, OPAL_PLATFORM_ERR_EVT, OPAL_SLW,
OPAL_PLATFORM_FIRMWARE, OPAL_INFO,
OPAL_NA);
DEFINE_LOG_ENTRY(OPAL_RC_SLW_REG, OPAL_PLATFORM_ERR_EVT, OPAL_SLW,
OPAL_PLATFORM_FIRMWARE, OPAL_INFO,
OPAL_NA);
static void slw_do_rvwinkle(void *data)
{
struct cpu_thread *cpu = this_cpu();
struct cpu_thread *master = data;
uint64_t lpcr = mfspr(SPR_LPCR);
struct proc_chip *chip;
/* Setup our ICP to receive IPIs */
icp_prep_for_pm();
/* Setup LPCR to wakeup on external interrupts only */
mtspr(SPR_LPCR, ((lpcr & ~SPR_LPCR_P8_PECE) | SPR_LPCR_P8_PECE2));
prlog(PR_DEBUG, "SLW: CPU PIR 0x%04x goint to rvwinkle...\n",
cpu->pir);
/* Tell that we got it */
cpu->state = cpu_state_rvwinkle;
enter_pm_state(1);
/* Restore SPRs */
init_shared_sprs();
init_replicated_sprs();
/* Ok, it's ours again */
cpu->state = cpu_state_active;
prlog(PR_DEBUG, "SLW: CPU PIR 0x%04x woken up !\n", cpu->pir);
/* Cleanup our ICP */
reset_cpu_icp();
/* Resync timebase */
chiptod_wakeup_resync();
/* Restore LPCR */
mtspr(SPR_LPCR, lpcr);
/* If we are passed a master pointer we are the designated
* waker, let's proceed. If not, return, we are finished.
*/
if (!master)
return;
prlog(PR_DEBUG, "SLW: CPU PIR 0x%04x waiting for master...\n",
cpu->pir);
/* Allriiiight... now wait for master to go down */
while(master->state != cpu_state_rvwinkle)
sync();
/* XXX Wait one second ! (should check xscom state ? ) */
time_wait_ms(1000);
for_each_chip(chip) {
struct cpu_thread *c;
uint64_t tmp;
for_each_available_core_in_chip(c, chip->id) {
xscom_read(chip->id,
XSCOM_ADDR_P8_EX_SLAVE(pir_to_core_id(c->pir),
EX_PM_IDLE_STATE_HISTORY_PHYP),
&tmp);
prlog(PR_TRACE, "SLW: core %x:%x"
" history: 0x%016llx (mid2)\n",
chip->id, pir_to_core_id(c->pir),
tmp);
}
}
prlog(PR_DEBUG, "SLW: Waking master (PIR 0x%04x)...\n", master->pir);
/* Now poke all the secondary threads on the master's core */
for_each_cpu(cpu) {
if (!cpu_is_sibling(cpu, master) || (cpu == master))
continue;
icp_kick_cpu(cpu);
/* Wait for it to claim to be back (XXX ADD TIMEOUT) */
while(cpu->state != cpu_state_active)
sync();
}
/* Now poke the master and be gone */
icp_kick_cpu(master);
}
static void slw_patch_reset(void)
{
uint32_t *src, *dst, *sav;
BUILD_ASSERT((&reset_patch_end - &reset_patch_start) <=
MAX_RESET_PATCH_SIZE);
src = &reset_patch_start;
dst = (uint32_t *)0x100;
sav = slw_saved_reset;
while(src < &reset_patch_end) {
*(sav++) = *(dst);
*(dst++) = *(src++);
}
sync_icache();
}
static void slw_unpatch_reset(void)
{
extern uint32_t reset_patch_start;
extern uint32_t reset_patch_end;
uint32_t *src, *dst, *sav;
src = &reset_patch_start;
dst = (uint32_t *)0x100;
sav = slw_saved_reset;
while(src < &reset_patch_end) {
*(dst++) = *(sav++);
src++;
}
sync_icache();
}
static bool slw_general_init(struct proc_chip *chip, struct cpu_thread *c)
{
uint32_t core = pir_to_core_id(c->pir);
uint64_t tmp;
int rc;
/* PowerManagement GP0 clear PM_DISABLE */
rc = xscom_read(chip->id, XSCOM_ADDR_P8_EX_SLAVE(core, EX_PM_GP0), &tmp);
if (rc) {
log_simple_error(&e_info(OPAL_RC_SLW_INIT),
"SLW: Failed to read PM_GP0\n");
return false;
}
tmp = tmp & ~0x8000000000000000ULL;
rc = xscom_write(chip->id, XSCOM_ADDR_P8_EX_SLAVE(core, EX_PM_GP0), tmp);
if (rc) {
log_simple_error(&e_info(OPAL_RC_SLW_INIT),
"SLW: Failed to write PM_GP0\n");
return false;
}
prlog(PR_TRACE, "SLW: PMGP0 set to 0x%016llx\n", tmp);
/* Read back for debug */
rc = xscom_read(chip->id, XSCOM_ADDR_P8_EX_SLAVE(core, EX_PM_GP0), &tmp);
if (rc)
log_simple_error(&e_info(OPAL_RC_SLW_INIT),
"SLW: Failed to re-read PM_GP0. Continuing...\n");
prlog(PR_TRACE, "SLW: PMGP0 read 0x%016llx\n", tmp);
return true;
}
static bool slw_set_overrides(struct proc_chip *chip, struct cpu_thread *c)
{
uint32_t core = pir_to_core_id(c->pir);
uint64_t tmp;
int rc;
/*
* Set ENABLE_IGNORE_RECOV_ERRORS in OHA_MODE_REG
*
* XXX FIXME: This should be only done for "forced" winkle such as
* when doing repairs or LE transition, and we should restore the
* original value when done
*/
rc = xscom_read(chip->id, XSCOM_ADDR_P8_EX(core, PM_OHA_MODE_REG),
&tmp);
if (rc) {
log_simple_error(&e_info(OPAL_RC_SLW_SET),
"SLW: Failed to read PM_OHA_MODE_REG\n");
return false;
}
tmp = tmp | 0x8000000000000000ULL;
rc = xscom_write(chip->id, XSCOM_ADDR_P8_EX(core, PM_OHA_MODE_REG),
tmp);
if (rc) {
log_simple_error(&e_info(OPAL_RC_SLW_SET),
"SLW: Failed to write PM_OHA_MODE_REG\n");
return false;
}
prlog(PR_TRACE, "SLW: PM_OHA_MODE_REG set to 0x%016llx\n", tmp);
/* Read back for debug */
rc = xscom_read(chip->id, XSCOM_ADDR_P8_EX(core, PM_OHA_MODE_REG),&tmp);
prlog(PR_TRACE, "SLW: PM_OHA_MODE_REG read 0x%016llx\n", tmp);
/*
* Clear special wakeup bits that could hold power mgt
*
* XXX FIXME: See above
*/
rc = xscom_write(chip->id,
XSCOM_ADDR_P8_EX_SLAVE(core, EX_PM_SPECIAL_WAKEUP_FSP),
0);
if (rc) {
log_simple_error(&e_info(OPAL_RC_SLW_SET),
"SLW: Failed to write PM_SPECIAL_WAKEUP_FSP\n");
return false;
}
rc = xscom_write(chip->id,
XSCOM_ADDR_P8_EX_SLAVE(core, EX_PM_SPECIAL_WAKEUP_OCC),
0);
if (rc) {
log_simple_error(&e_info(OPAL_RC_SLW_SET),
"SLW: Failed to write PM_SPECIAL_WAKEUP_OCC\n");
return false;
}
rc = xscom_write(chip->id,
XSCOM_ADDR_P8_EX_SLAVE(core, EX_PM_SPECIAL_WAKEUP_PHYP),
0);
if (rc) {
log_simple_error(&e_info(OPAL_RC_SLW_SET),
"SLW: Failed to write PM_SPECIAL_WAKEUP_PHYP\n");
return false;
}
return true;
}
static bool slw_set_overrides_p9(struct proc_chip *chip, struct cpu_thread *c)
{
uint64_t tmp;
int rc;
uint32_t core = pir_to_core_id(c->pir);
/* MAMBO does not require this init */
if (proc_chip_quirks & QUIRK_MAMBO_CALLOUTS) {
return true;
}
/* Clear special wakeup bits that could hold power mgt */
rc = xscom_write(chip->id,
XSCOM_ADDR_P9_EC_SLAVE(core, EC_PPM_SPECIAL_WKUP_HYP),
0);
if (rc) {
log_simple_error(&e_info(OPAL_RC_SLW_SET),
"SLW: Failed to write EC_PPM_SPECIAL_WKUP_HYP\n");
return false;
}
/* Read back for debug */
rc = xscom_read(chip->id,
XSCOM_ADDR_P9_EC_SLAVE(core, EC_PPM_SPECIAL_WKUP_HYP),
&tmp);
prlog(PR_DEBUG, "SLW: EC_PPM_SPECIAL_WKUP_HYP read 0x%016llx\n", tmp);
rc = xscom_read(chip->id,
XSCOM_ADDR_P9_EC_SLAVE(core, EC_PPM_SPECIAL_WKUP_OTR),
&tmp);
if (tmp)
prlog(PR_WARNING, "SLW: EC_PPM_SPECIAL_WKUP_OTR read 0x%016llx\n", tmp);
return true;
}
static bool slw_unset_overrides(struct proc_chip *chip, struct cpu_thread *c)
{
uint32_t core = pir_to_core_id(c->pir);
/* XXX FIXME: Save and restore the overrides */
prlog(PR_DEBUG, "SLW: slw_unset_overrides %x:%x\n", chip->id, core);
return true;
}
static bool slw_set_idle_mode(struct proc_chip *chip, struct cpu_thread *c)
{
uint32_t core = pir_to_core_id(c->pir);
uint64_t tmp;
int rc;
/*
* PM GP1 allows fast/deep mode to be selected independently for sleep
* and winkle. Init PM GP1 so that sleep happens in fast mode and
* winkle happens in deep mode.
* Make use of the OR XSCOM for this since the OCC might be manipulating
* the PM_GP1 register as well. Before doing this ensure that the bits
* managing idle states are cleared so as to override any bits set at
* init time.
*/
tmp = ~EX_PM_GP1_SLEEP_WINKLE_MASK;
rc = xscom_write(chip->id, XSCOM_ADDR_P8_EX_SLAVE(core, EX_PM_CLEAR_GP1),
tmp);
if (rc) {
log_simple_error(&e_info(OPAL_RC_SLW_SET),
"SLW: Failed to write PM_GP1\n");
return false;
}
rc = xscom_write(chip->id, XSCOM_ADDR_P8_EX_SLAVE(core, EX_PM_SET_GP1),
EX_PM_SETUP_GP1_FAST_SLEEP_DEEP_WINKLE);
if (rc) {
log_simple_error(&e_info(OPAL_RC_SLW_SET),
"SLW: Failed to write PM_GP1\n");
return false;
}
/* Read back for debug */
xscom_read(chip->id, XSCOM_ADDR_P8_EX_SLAVE(core, EX_PM_GP1), &tmp);
prlog(PR_TRACE, "SLW: PMGP1 read 0x%016llx\n", tmp);
return true;
}
static bool slw_get_idle_state_history(struct proc_chip *chip, struct cpu_thread *c)
{
uint32_t core = pir_to_core_id(c->pir);
uint64_t tmp;
int rc;
/* Cleanup history */
rc = xscom_read(chip->id,
XSCOM_ADDR_P8_EX_SLAVE(core, EX_PM_IDLE_STATE_HISTORY_PHYP),
&tmp);
if (rc) {
log_simple_error(&e_info(OPAL_RC_SLW_GET),
"SLW: Failed to read PM_IDLE_STATE_HISTORY\n");
return false;
}
prlog(PR_TRACE, "SLW: core %x:%x history: 0x%016llx (old1)\n",
chip->id, core, tmp);
rc = xscom_read(chip->id,
XSCOM_ADDR_P8_EX_SLAVE(core, EX_PM_IDLE_STATE_HISTORY_PHYP),
&tmp);
if (rc) {
log_simple_error(&e_info(OPAL_RC_SLW_GET),
"SLW: Failed to read PM_IDLE_STATE_HISTORY\n");
return false;
}
prlog(PR_TRACE, "SLW: core %x:%x history: 0x%016llx (old2)\n",
chip->id, core, tmp);
return true;
}
static bool idle_prepare_core(struct proc_chip *chip, struct cpu_thread *c)
{
prlog(PR_TRACE, "FASTSLEEP: Prepare core %x:%x\n",
chip->id, pir_to_core_id(c->pir));
if(!slw_general_init(chip, c))
return false;
if(!slw_set_overrides(chip, c))
return false;
if(!slw_set_idle_mode(chip, c))
return false;
if(!slw_get_idle_state_history(chip, c))
return false;
return true;
}
/* Define device-tree fields */
#define MAX_NAME_LEN 16
struct cpu_idle_states {
char name[MAX_NAME_LEN];
u32 latency_ns;
u32 residency_ns;
/*
* Register value/mask used to select different idle states.
* PMICR in POWER8 and PSSCR in POWER9
*/
u64 pm_ctrl_reg_val;
u64 pm_ctrl_reg_mask;
u32 flags;
};
static struct cpu_idle_states power7_cpu_idle_states[] = {
{ /* nap */
.name = "nap",
.latency_ns = 4000,
.residency_ns = 100000,
.flags = 0*OPAL_PM_DEC_STOP \
| 0*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 0*OPAL_PM_LOSE_HYP_CONTEXT \
| 0*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_NAP_ENABLED \
| 0*OPAL_PM_SLEEP_ENABLED \
| 0*OPAL_PM_WINKLE_ENABLED \
| 0*OPAL_USE_PMICR,
.pm_ctrl_reg_val = 0,
.pm_ctrl_reg_mask = 0 },
};
static struct cpu_idle_states power8_cpu_idle_states[] = {
{ /* nap */
.name = "nap",
.latency_ns = 4000,
.residency_ns = 100000,
.flags = 0*OPAL_PM_DEC_STOP \
| 0*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 0*OPAL_PM_LOSE_HYP_CONTEXT \
| 0*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_NAP_ENABLED \
| 0*OPAL_USE_PMICR,
.pm_ctrl_reg_val = 0,
.pm_ctrl_reg_mask = 0 },
{ /* fast sleep (with workaround) */
.name = "fastsleep_",
.latency_ns = 40000,
.residency_ns = 300000000,
.flags = 1*OPAL_PM_DEC_STOP \
| 1*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 0*OPAL_PM_LOSE_HYP_CONTEXT \
| 0*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_SLEEP_ENABLED_ER1 \
| 0*OPAL_USE_PMICR, /* Not enabled until deep
states are available */
.pm_ctrl_reg_val = OPAL_PM_FASTSLEEP_PMICR,
.pm_ctrl_reg_mask = OPAL_PM_SLEEP_PMICR_MASK },
{ /* Winkle */
.name = "winkle",
.latency_ns = 10000000,
.residency_ns = 1000000000, /* Educated guess (not measured).
* Winkle is not currently used by
* linux cpuidle subsystem so we
* don't have real world user.
* However, this should be roughly
* accurate for when linux does
* use it. */
.flags = 1*OPAL_PM_DEC_STOP \
| 1*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 1*OPAL_PM_LOSE_HYP_CONTEXT \
| 1*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_WINKLE_ENABLED \
| 0*OPAL_USE_PMICR, /* Currently choosing deep vs
fast via EX_PM_GP1 reg */
.pm_ctrl_reg_val = 0,
.pm_ctrl_reg_mask = 0 },
};
/*
* cpu_idle_states for key idle states of POWER9 that we want to
* exploit.
* Note latency_ns and residency_ns are estimated values for now.
*/
static struct cpu_idle_states power9_cpu_idle_states[] = {
{
.name = "stop0_lite", /* Enter stop0 with no state loss */
.latency_ns = 1000,
.residency_ns = 10000,
.flags = 0*OPAL_PM_DEC_STOP \
| 0*OPAL_PM_TIMEBASE_STOP \
| 0*OPAL_PM_LOSE_USER_CONTEXT \
| 0*OPAL_PM_LOSE_HYP_CONTEXT \
| 0*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_FAST,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(0) \
| OPAL_PM_PSSCR_MTL(3) \
| OPAL_PM_PSSCR_TR(3),
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
{
.name = "stop0",
.latency_ns = 2000,
.residency_ns = 20000,
.flags = 0*OPAL_PM_DEC_STOP \
| 0*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 0*OPAL_PM_LOSE_HYP_CONTEXT \
| 0*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_FAST,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(0) \
| OPAL_PM_PSSCR_MTL(3) \
| OPAL_PM_PSSCR_TR(3) \
| OPAL_PM_PSSCR_ESL \
| OPAL_PM_PSSCR_EC,
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
{
.name = "stop1_lite", /* Enter stop1 with no state loss */
.latency_ns = 4900,
.residency_ns = 49000,
.flags = 0*OPAL_PM_DEC_STOP \
| 0*OPAL_PM_TIMEBASE_STOP \
| 0*OPAL_PM_LOSE_USER_CONTEXT \
| 0*OPAL_PM_LOSE_HYP_CONTEXT \
| 0*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_FAST,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(1) \
| OPAL_PM_PSSCR_MTL(3) \
| OPAL_PM_PSSCR_TR(3),
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
{
.name = "stop1",
.latency_ns = 5000,
.residency_ns = 50000,
.flags = 0*OPAL_PM_DEC_STOP \
| 0*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 0*OPAL_PM_LOSE_HYP_CONTEXT \
| 0*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_FAST,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(1) \
| OPAL_PM_PSSCR_MTL(3) \
| OPAL_PM_PSSCR_TR(3) \
| OPAL_PM_PSSCR_ESL \
| OPAL_PM_PSSCR_EC,
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
{
.name = "stop2_lite", /* Enter stop2 with no state loss */
.latency_ns = 9900,
.residency_ns = 99000,
.flags = 0*OPAL_PM_DEC_STOP \
| 0*OPAL_PM_TIMEBASE_STOP \
| 0*OPAL_PM_LOSE_USER_CONTEXT \
| 0*OPAL_PM_LOSE_HYP_CONTEXT \
| 0*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_FAST,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(2) \
| OPAL_PM_PSSCR_MTL(3) \
| OPAL_PM_PSSCR_TR(3),
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
{
.name = "stop2",
.latency_ns = 10000,
.residency_ns = 100000,
.flags = 0*OPAL_PM_DEC_STOP \
| 0*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 0*OPAL_PM_LOSE_HYP_CONTEXT \
| 0*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_FAST,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(2) \
| OPAL_PM_PSSCR_MTL(3) \
| OPAL_PM_PSSCR_TR(3) \
| OPAL_PM_PSSCR_ESL \
| OPAL_PM_PSSCR_EC,
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
{
.name = "stop4",
.latency_ns = 100000,
.residency_ns = 1000000,
.flags = 1*OPAL_PM_DEC_STOP \
| 1*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 1*OPAL_PM_LOSE_HYP_CONTEXT \
| 1*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_DEEP,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(4) \
| OPAL_PM_PSSCR_MTL(7) \
| OPAL_PM_PSSCR_TR(3) \
| OPAL_PM_PSSCR_ESL \
| OPAL_PM_PSSCR_EC,
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
{
.name = "stop8",
.latency_ns = 2000000,
.residency_ns = 20000000,
.flags = 1*OPAL_PM_DEC_STOP \
| 1*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 1*OPAL_PM_LOSE_HYP_CONTEXT \
| 1*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_DEEP,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(8) \
| OPAL_PM_PSSCR_MTL(11) \
| OPAL_PM_PSSCR_TR(3) \
| OPAL_PM_PSSCR_ESL \
| OPAL_PM_PSSCR_EC,
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
{
.name = "stop11",
.latency_ns = 10000000,
.residency_ns = 100000000,
.flags = 1*OPAL_PM_DEC_STOP \
| 1*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 1*OPAL_PM_LOSE_HYP_CONTEXT \
| 1*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_DEEP,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(11) \
| OPAL_PM_PSSCR_MTL(11) \
| OPAL_PM_PSSCR_TR(3) \
| OPAL_PM_PSSCR_ESL \
| OPAL_PM_PSSCR_EC,
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
};
/*
* Prior to Mambo.7.8.21, mambo did set the MSR correctly for lite stop
* states, so disable them for now.
*/
static struct cpu_idle_states power9_mambo_cpu_idle_states[] = {
{
.name = "stop0",
.latency_ns = 2000,
.residency_ns = 20000,
.flags = 0*OPAL_PM_DEC_STOP \
| 0*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 0*OPAL_PM_LOSE_HYP_CONTEXT \
| 0*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_FAST,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(0) \
| OPAL_PM_PSSCR_MTL(3) \
| OPAL_PM_PSSCR_TR(3) \
| OPAL_PM_PSSCR_ESL \
| OPAL_PM_PSSCR_EC,
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
{
.name = "stop1",
.latency_ns = 5000,
.residency_ns = 50000,
.flags = 0*OPAL_PM_DEC_STOP \
| 0*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 0*OPAL_PM_LOSE_HYP_CONTEXT \
| 0*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_FAST,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(1) \
| OPAL_PM_PSSCR_MTL(3) \
| OPAL_PM_PSSCR_TR(3) \
| OPAL_PM_PSSCR_ESL \
| OPAL_PM_PSSCR_EC,
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
{
.name = "stop2",
.latency_ns = 10000,
.residency_ns = 100000,
.flags = 0*OPAL_PM_DEC_STOP \
| 0*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 0*OPAL_PM_LOSE_HYP_CONTEXT \
| 0*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_FAST,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(2) \
| OPAL_PM_PSSCR_MTL(3) \
| OPAL_PM_PSSCR_TR(3) \
| OPAL_PM_PSSCR_ESL \
| OPAL_PM_PSSCR_EC,
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
{
.name = "stop4",
.latency_ns = 100000,
.residency_ns = 1000000,
.flags = 1*OPAL_PM_DEC_STOP \
| 1*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 1*OPAL_PM_LOSE_HYP_CONTEXT \
| 1*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_DEEP,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(4) \
| OPAL_PM_PSSCR_MTL(7) \
| OPAL_PM_PSSCR_TR(3) \
| OPAL_PM_PSSCR_ESL \
| OPAL_PM_PSSCR_EC,
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
{
.name = "stop8",
.latency_ns = 2000000,
.residency_ns = 20000000,
.flags = 1*OPAL_PM_DEC_STOP \
| 1*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 1*OPAL_PM_LOSE_HYP_CONTEXT \
| 1*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_DEEP,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(8) \
| OPAL_PM_PSSCR_MTL(11) \
| OPAL_PM_PSSCR_TR(3) \
| OPAL_PM_PSSCR_ESL \
| OPAL_PM_PSSCR_EC,
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
{
.name = "stop11",
.latency_ns = 10000000,
.residency_ns = 100000000,
.flags = 1*OPAL_PM_DEC_STOP \
| 1*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 1*OPAL_PM_LOSE_HYP_CONTEXT \
| 1*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_DEEP,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(11) \
| OPAL_PM_PSSCR_MTL(11) \
| OPAL_PM_PSSCR_TR(3) \
| OPAL_PM_PSSCR_ESL \
| OPAL_PM_PSSCR_EC,
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
};
/* Idle states supported for P9 DD1 */
static struct cpu_idle_states power9_ndd1_cpu_idle_states[] = {
{
.name = "stop0_lite",
.latency_ns = 1000,
.residency_ns = 10000,
.flags = 0*OPAL_PM_DEC_STOP \
| 0*OPAL_PM_TIMEBASE_STOP \
| 0*OPAL_PM_LOSE_USER_CONTEXT \
| 0*OPAL_PM_LOSE_HYP_CONTEXT \
| 0*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_FAST,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(0) \
| OPAL_PM_PSSCR_MTL(3) \
| OPAL_PM_PSSCR_TR(3),
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
{
.name = "stop1_lite",
.latency_ns = 4900,
.residency_ns = 49000,
.flags = 0*OPAL_PM_DEC_STOP \
| 0*OPAL_PM_TIMEBASE_STOP \
| 0*OPAL_PM_LOSE_USER_CONTEXT \
| 0*OPAL_PM_LOSE_HYP_CONTEXT \
| 0*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_FAST,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(1) \
| OPAL_PM_PSSCR_MTL(3) \
| OPAL_PM_PSSCR_TR(3),
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
{
.name = "stop1",
.latency_ns = 2050000,
.residency_ns = 50000,
.flags = 0*OPAL_PM_DEC_STOP \
| 0*OPAL_PM_TIMEBASE_STOP \
| 1*OPAL_PM_LOSE_USER_CONTEXT \
| 0*OPAL_PM_LOSE_HYP_CONTEXT \
| 0*OPAL_PM_LOSE_FULL_CONTEXT \
| 1*OPAL_PM_STOP_INST_FAST,
.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(1) \
| OPAL_PM_PSSCR_MTL(3) \
| OPAL_PM_PSSCR_TR(3) \
| OPAL_PM_PSSCR_ESL \
| OPAL_PM_PSSCR_EC,
.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK }
};
/* Add device tree properties to describe idle states */
void add_cpu_idle_state_properties(void)
{
struct dt_node *power_mgt;
struct cpu_idle_states *states;
struct proc_chip *chip;
int nr_states;
bool can_sleep = true;
bool has_slw = true;
bool has_stop_inst = false;
u8 i;
u64 *pm_ctrl_reg_val_buf;
u64 *pm_ctrl_reg_mask_buf;
u32 supported_states_mask;
u32 stop_levels;
/* Variables to track buffer length */
u8 name_buf_len;
u8 num_supported_idle_states;
/* Buffers to hold idle state properties */
char *name_buf, *alloced_name_buf;
u32 *latency_ns_buf;
u32 *residency_ns_buf;
u32 *flags_buf;
prlog(PR_DEBUG, "CPU idle state device tree init\n");
/* Create /ibm,opal/power-mgt if it doesn't exist already */
power_mgt = dt_new_check(opal_node, "power-mgt");
if (!power_mgt) {
/**
* @fwts-label CreateDTPowerMgtNodeFail
* @fwts-advice OPAL failed to add the power-mgt device tree
* node. This could mean that firmware ran out of memory,
* or there's a bug somewhere.
*/
prlog(PR_ERR, "creating dt node /ibm,opal/power-mgt failed\n");
return;
}
/*
* Chose the right state table for the chip
*
* XXX We use the first chip version, we should probably look
* for the smaller of all chips instead..
*/
chip = next_chip(NULL);
assert(chip);
if (chip->type == PROC_CHIP_P9_NIMBUS ||
chip->type == PROC_CHIP_P9_CUMULUS) {
if (proc_chip_quirks & QUIRK_MAMBO_CALLOUTS) {
states = power9_mambo_cpu_idle_states;
nr_states = ARRAY_SIZE(power9_mambo_cpu_idle_states);
} else if ((chip->ec_level == 0x10) &&
(chip->type == PROC_CHIP_P9_NIMBUS)) {
states = power9_ndd1_cpu_idle_states;
nr_states = ARRAY_SIZE(power9_ndd1_cpu_idle_states);
} else {
states = power9_cpu_idle_states;
nr_states = ARRAY_SIZE(power9_cpu_idle_states);
}
has_stop_inst = true;
stop_levels = dt_prop_get_u32_def(power_mgt,
"ibm,enabled-stop-levels", 0);
if (!stop_levels)
prerror("SLW: No stop levels available. Power saving is disabled!\n");
} else if (chip->type == PROC_CHIP_P8_MURANO ||
chip->type == PROC_CHIP_P8_VENICE ||
chip->type == PROC_CHIP_P8_NAPLES) {
const struct dt_property *p;
p = dt_find_property(dt_root, "ibm,enabled-idle-states");
if (p)
prlog(PR_NOTICE,
"SLW: HB-provided idle states property found\n");
states = power8_cpu_idle_states;
nr_states = ARRAY_SIZE(power8_cpu_idle_states);
/* Check if hostboot say we can sleep */
if (!p || !dt_prop_find_string(p, "fast-sleep")) {
prlog(PR_WARNING, "SLW: Sleep not enabled by HB"
" on this platform\n");
can_sleep = false;
}
/* Clip to NAP only on Murano and Venice DD1.x */
if ((chip->type == PROC_CHIP_P8_MURANO ||
chip->type == PROC_CHIP_P8_VENICE) &&
chip->ec_level < 0x20) {
prlog(PR_NOTICE, "SLW: Sleep not enabled on P8 DD1.x\n");
can_sleep = false;
}
} else {
states = power7_cpu_idle_states;
nr_states = ARRAY_SIZE(power7_cpu_idle_states);
}
/* Enable deep idle states only if slw image is intact */
has_slw = (chip->slw_base && chip->slw_bar_size &&
chip->slw_image_size);
/*
* Currently we can't append strings and cells to dt properties.
* So create buffers to which you can append values, then create
* dt properties with this buffer content.
*/
/* Allocate memory to idle state property buffers. */
alloced_name_buf= malloc(nr_states * sizeof(char) * MAX_NAME_LEN);
name_buf = alloced_name_buf;
latency_ns_buf = malloc(nr_states * sizeof(u32));
residency_ns_buf= malloc(nr_states * sizeof(u32));
flags_buf = malloc(nr_states * sizeof(u32));
pm_ctrl_reg_val_buf = malloc(nr_states * sizeof(u64));
pm_ctrl_reg_mask_buf = malloc(nr_states * sizeof(u64));
name_buf_len = 0;
num_supported_idle_states = 0;
/*
* Create a mask with the flags of all supported idle states
* set. Use this to only add supported idle states to the
* device-tree
*/
if (has_stop_inst) {
/* Power 9 / POWER ISA 3.0 */
supported_states_mask = OPAL_PM_STOP_INST_FAST;
if (has_slw)
supported_states_mask |= OPAL_PM_STOP_INST_DEEP;
} else {
/* Power 7 and Power 8 */
supported_states_mask = OPAL_PM_NAP_ENABLED;
if (can_sleep)
supported_states_mask |= OPAL_PM_SLEEP_ENABLED |
OPAL_PM_SLEEP_ENABLED_ER1;
if (has_slw)
supported_states_mask |= OPAL_PM_WINKLE_ENABLED;
}
for (i = 0; i < nr_states; i++) {
/* For each state, check if it is one of the supported states. */
if (!(states[i].flags & supported_states_mask))
continue;
/* We can only use the stop levels that HB has made available */
if (has_stop_inst) {
u32 level = 31 - (states[i].pm_ctrl_reg_val &
OPAL_PM_PSSCR_RL_MASK);
if (!(stop_levels & (1ul << level)))
continue;
}
prlog(PR_NOTICE, "SLW: Enabling: %s\n", states[i].name);
/*
* If a state is supported add each of its property
* to its corresponding property buffer.
*/
strncpy(name_buf, states[i].name, MAX_NAME_LEN);
name_buf = name_buf + strlen(states[i].name) + 1;
*latency_ns_buf = cpu_to_fdt32(states[i].latency_ns);
latency_ns_buf++;
*residency_ns_buf = cpu_to_fdt32(states[i].residency_ns);
residency_ns_buf++;
*flags_buf = cpu_to_fdt32(states[i].flags);
flags_buf++;
*pm_ctrl_reg_val_buf = cpu_to_fdt64(states[i].pm_ctrl_reg_val);
pm_ctrl_reg_val_buf++;
*pm_ctrl_reg_mask_buf = cpu_to_fdt64(states[i].pm_ctrl_reg_mask);
pm_ctrl_reg_mask_buf++;
/* Increment buffer length trackers */
name_buf_len += strlen(states[i].name) + 1;
num_supported_idle_states++;
}
/* Point buffer pointers back to beginning of the buffer */
name_buf -= name_buf_len;
latency_ns_buf -= num_supported_idle_states;
residency_ns_buf -= num_supported_idle_states;
flags_buf -= num_supported_idle_states;
pm_ctrl_reg_val_buf -= num_supported_idle_states;
pm_ctrl_reg_mask_buf -= num_supported_idle_states;