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Subject[PATCH 2/2] cpuidle : Add auto-promotion flag to cpuidle flags
Date
This patch sets up flags for the state which needs to be auto-promoted.
For powernv systems, lite states do not even lose user context. That
information has been used to set the flag for lite states.

Signed-off-by: Abhishek Goel <huntbag@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/opal-api.h | 1 +
drivers/cpuidle/Kconfig | 4 ++++
drivers/cpuidle/cpuidle-powernv.c | 13 +++++++++++--
3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
index 870fb7b23..735dec731 100644
--- a/arch/powerpc/include/asm/opal-api.h
+++ b/arch/powerpc/include/asm/opal-api.h
@@ -226,6 +226,7 @@
*/

#define OPAL_PM_TIMEBASE_STOP 0x00000002
+#define OPAL_PM_LOSE_USER_CONTEXT 0x00001000
#define OPAL_PM_LOSE_HYP_CONTEXT 0x00002000
#define OPAL_PM_LOSE_FULL_CONTEXT 0x00004000
#define OPAL_PM_NAP_ENABLED 0x00010000
diff --git a/drivers/cpuidle/Kconfig b/drivers/cpuidle/Kconfig
index 7e48eb5bf..0ece62684 100644
--- a/drivers/cpuidle/Kconfig
+++ b/drivers/cpuidle/Kconfig
@@ -26,6 +26,10 @@ config CPU_IDLE_GOV_MENU
config DT_IDLE_STATES
bool

+config CPU_IDLE_AUTO_PROMOTION
+ bool
+ default y if PPC_POWERNV
+
menu "ARM CPU Idle Drivers"
depends on ARM || ARM64
source "drivers/cpuidle/Kconfig.arm"
diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c
index 84b1ebe21..e351f5f9c 100644
--- a/drivers/cpuidle/cpuidle-powernv.c
+++ b/drivers/cpuidle/cpuidle-powernv.c
@@ -299,6 +299,7 @@ static int powernv_add_idle_states(void)
for (i = 0; i < dt_idle_states; i++) {
unsigned int exit_latency, target_residency;
bool stops_timebase = false;
+ bool lose_user_context = false;
struct pnv_idle_states_t *state = &pnv_idle_states[i];

/*
@@ -324,6 +325,9 @@ static int powernv_add_idle_states(void)
if (has_stop_states && !(state->valid))
continue;

+ if (state->flags & OPAL_PM_LOSE_USER_CONTEXT)
+ lose_user_context = true;
+
if (state->flags & OPAL_PM_TIMEBASE_STOP)
stops_timebase = true;

@@ -332,12 +336,17 @@ static int powernv_add_idle_states(void)
add_powernv_state(nr_idle_states, "Nap",
CPUIDLE_FLAG_NONE, nap_loop,
target_residency, exit_latency, 0, 0);
+ } else if (has_stop_states & !lose_user_context) {
+ add_powernv_state(nr_idle_states, state->name,
+ CPUIDLE_FLAG_AUTO_PROMOTION,
+ stop_loop, target_residency,
+ exit_latency, state->psscr_val,
+ state->psscr_mask);
} else if (has_stop_states && !stops_timebase) {
add_powernv_state(nr_idle_states, state->name,
CPUIDLE_FLAG_NONE, stop_loop,
target_residency, exit_latency,
- state->psscr_val,
- state->psscr_mask);
+ state->psscr_val, state->psscr_mask);
}

/*
--
2.17.1
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