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Message-ID: <20230112195540.068981667@infradead.org>
Date: Thu, 12 Jan 2023 20:43:26 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: peterz@...radead.org
Cc: richard.henderson@...aro.org, ink@...assic.park.msu.ru,
mattst88@...il.com, vgupta@...nel.org, linux@...linux.org.uk,
nsekhar@...com, brgl@...ev.pl, ulli.kroll@...glemail.com,
linus.walleij@...aro.org, shawnguo@...nel.org,
Sascha Hauer <s.hauer@...gutronix.de>, kernel@...gutronix.de,
festevam@...il.com, linux-imx@....com, tony@...mide.com,
khilman@...nel.org, krzysztof.kozlowski@...aro.org,
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guoren@...nel.org, bcain@...cinc.com, chenhuacai@...nel.org,
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"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH v3 12/51] cpuidle,dt: Push RCU-idle into driver
Doing RCU-idle outside the driver, only to then temporarily enable it
again before going idle is daft.
Notably: this converts all dt_init_idle_driver() and
__CPU_PM_CPU_IDLE_ENTER() users for they are inextrably intertwined.
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Acked-by: Frederic Weisbecker <frederic@...nel.org>
Tested-by: Tony Lindgren <tony@...mide.com>
Tested-by: Ulf Hansson <ulf.hansson@...aro.org>
---
drivers/acpi/processor_idle.c | 2 ++
drivers/cpuidle/cpuidle-arm.c | 1 +
drivers/cpuidle/cpuidle-big_little.c | 8 ++++++--
drivers/cpuidle/cpuidle-psci.c | 1 +
drivers/cpuidle/cpuidle-qcom-spm.c | 1 +
drivers/cpuidle/cpuidle-riscv-sbi.c | 1 +
drivers/cpuidle/dt_idle_states.c | 2 +-
include/linux/cpuidle.h | 2 ++
8 files changed, 15 insertions(+), 3 deletions(-)
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -1219,6 +1219,8 @@ static int acpi_processor_setup_lpi_stat
state->target_residency = lpi->min_residency;
if (lpi->arch_flags)
state->flags |= CPUIDLE_FLAG_TIMER_STOP;
+ if (i != 0 && lpi->entry_method == ACPI_CSTATE_FFH)
+ state->flags |= CPUIDLE_FLAG_RCU_IDLE;
state->enter = acpi_idle_lpi_enter;
drv->safe_state_index = i;
}
--- a/drivers/cpuidle/cpuidle-big_little.c
+++ b/drivers/cpuidle/cpuidle-big_little.c
@@ -64,7 +64,8 @@ static struct cpuidle_driver bl_idle_lit
.enter = bl_enter_powerdown,
.exit_latency = 700,
.target_residency = 2500,
- .flags = CPUIDLE_FLAG_TIMER_STOP,
+ .flags = CPUIDLE_FLAG_TIMER_STOP |
+ CPUIDLE_FLAG_RCU_IDLE,
.name = "C1",
.desc = "ARM little-cluster power down",
},
@@ -85,7 +86,8 @@ static struct cpuidle_driver bl_idle_big
.enter = bl_enter_powerdown,
.exit_latency = 500,
.target_residency = 2000,
- .flags = CPUIDLE_FLAG_TIMER_STOP,
+ .flags = CPUIDLE_FLAG_TIMER_STOP |
+ CPUIDLE_FLAG_RCU_IDLE,
.name = "C1",
.desc = "ARM big-cluster power down",
},
@@ -124,11 +126,13 @@ static int bl_enter_powerdown(struct cpu
struct cpuidle_driver *drv, int idx)
{
cpu_pm_enter();
+ ct_idle_enter();
cpu_suspend(0, bl_powerdown_finisher);
/* signals the MCPM core that CPU is out of low power state */
mcpm_cpu_powered_up();
+ ct_idle_exit();
cpu_pm_exit();
--- a/drivers/cpuidle/dt_idle_states.c
+++ b/drivers/cpuidle/dt_idle_states.c
@@ -77,7 +77,7 @@ static int init_state_node(struct cpuidl
if (err)
desc = state_node->name;
- idle_state->flags = 0;
+ idle_state->flags = CPUIDLE_FLAG_RCU_IDLE;
if (of_property_read_bool(state_node, "local-timer-stop"))
idle_state->flags |= CPUIDLE_FLAG_TIMER_STOP;
/*
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -289,7 +289,9 @@ extern s64 cpuidle_governor_latency_req(
if (!is_retention) \
__ret = cpu_pm_enter(); \
if (!__ret) { \
+ ct_idle_enter(); \
__ret = low_level_idle_enter(state); \
+ ct_idle_exit(); \
if (!is_retention) \
cpu_pm_exit(); \
} \
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