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authorPeter Zijlstra <peterz@infradead.org>2023-01-12 22:43:26 +0300
committerIngo Molnar <mingo@kernel.org>2023-01-13 13:48:00 +0300
commit0c5ffc3d7b15978c6b184938cd6b8af06e436424 (patch)
tree48f3b3d321afa0c435ec1d83281cc28942923816
parentc3d42418dca53d6c498a48c408f7a45289593650 (diff)
downloadlinux-0c5ffc3d7b15978c6b184938cd6b8af06e436424.tar.xz
cpuidle, dt: Push RCU-idle into driver
Doing RCU-idle outside the driver, only to then temporarily enable it again before going idle is suboptimal. 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@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Tested-by: Tony Lindgren <tony@atomide.com> Tested-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Frederic Weisbecker <frederic@kernel.org> Link: https://lore.kernel.org/r/20230112195540.068981667@infradead.org
-rw-r--r--drivers/acpi/processor_idle.c2
-rw-r--r--drivers/cpuidle/cpuidle-big_little.c8
-rw-r--r--drivers/cpuidle/dt_idle_states.c2
-rw-r--r--include/linux/cpuidle.h2
4 files changed, 11 insertions, 3 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 7bf882fcd64b..566f7dbf7ab3 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -1219,6 +1219,8 @@ static int acpi_processor_setup_lpi_states(struct acpi_processor *pr)
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;
}
diff --git a/drivers/cpuidle/cpuidle-big_little.c b/drivers/cpuidle/cpuidle-big_little.c
index abe51185f243..fffd4ed0c4d1 100644
--- a/drivers/cpuidle/cpuidle-big_little.c
+++ b/drivers/cpuidle/cpuidle-big_little.c
@@ -64,7 +64,8 @@ static struct cpuidle_driver bl_idle_little_driver = {
.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_driver = {
.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 cpuidle_device *dev,
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();
diff --git a/drivers/cpuidle/dt_idle_states.c b/drivers/cpuidle/dt_idle_states.c
index 7ca3d7d9b5ea..02aa0b39af9d 100644
--- a/drivers/cpuidle/dt_idle_states.c
+++ b/drivers/cpuidle/dt_idle_states.c
@@ -77,7 +77,7 @@ static int init_state_node(struct cpuidle_state *idle_state,
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;
/*
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index fce476275e16..0ddc11e44302 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -289,7 +289,9 @@ extern s64 cpuidle_governor_latency_req(unsigned int cpu);
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(); \
} \