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authorLinus Torvalds <torvalds@linux-foundation.org>2017-07-07 13:55:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-07 13:55:45 -0700
commitd691b7e7d1b5186eae62fd32adee65d3316bfdf6 (patch)
tree3808f7deab74f68267b9fdd6a35dcda9e50142aa /drivers/cpuidle
parentb59eea554f57befa2aa3172fcb63e521bdd850dd (diff)
parent1e0fc9d1eb2b0241a03e0a02bcdb9b5b641b9d35 (diff)
downloadlinux-d691b7e7d1b5186eae62fd32adee65d3316bfdf6.tar.bz2
Merge tag 'powerpc-4.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc updates from Michael Ellerman: "Highlights include: - Support for STRICT_KERNEL_RWX on 64-bit server CPUs. - Platform support for FSP2 (476fpe) board - Enable ZONE_DEVICE on 64-bit server CPUs. - Generic & powerpc spin loop primitives to optimise busy waiting - Convert VDSO update function to use new update_vsyscall() interface - Optimisations to hypercall/syscall/context-switch paths - Improvements to the CPU idle code on Power8 and Power9. As well as many other fixes and improvements. Thanks to: Akshay Adiga, Andrew Donnellan, Andrew Jeffery, Anshuman Khandual, Anton Blanchard, Balbir Singh, Benjamin Herrenschmidt, Christophe Leroy, Christophe Lombard, Colin Ian King, Dan Carpenter, Gautham R. Shenoy, Hari Bathini, Ian Munsie, Ivan Mikhaylov, Javier Martinez Canillas, Madhavan Srinivasan, Masahiro Yamada, Matt Brown, Michael Neuling, Michal Suchanek, Murilo Opsfelder Araujo, Naveen N. Rao, Nicholas Piggin, Oliver O'Halloran, Paul Mackerras, Pavel Machek, Russell Currey, Santosh Sivaraj, Stephen Rothwell, Thiago Jung Bauermann, Yang Li" * tag 'powerpc-4.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (158 commits) powerpc/Kconfig: Enable STRICT_KERNEL_RWX for some configs powerpc/mm/radix: Implement STRICT_RWX/mark_rodata_ro() for Radix powerpc/mm/hash: Implement mark_rodata_ro() for hash powerpc/vmlinux.lds: Align __init_begin to 16M powerpc/lib/code-patching: Use alternate map for patch_instruction() powerpc/xmon: Add patch_instruction() support for xmon powerpc/kprobes/optprobes: Use patch_instruction() powerpc/kprobes: Move kprobes over to patch_instruction() powerpc/mm/radix: Fix execute permissions for interrupt_vectors powerpc/pseries: Fix passing of pp0 in updatepp() and updateboltedpp() powerpc/64s: Blacklist rtas entry/exit from kprobes powerpc/64s: Blacklist functions invoked on a trap powerpc/64s: Un-blacklist system_call() from kprobes powerpc/64s: Move system_call() symbol to just after setting MSR_EE powerpc/64s: Blacklist system_call() and system_call_common() from kprobes powerpc/64s: Convert .L__replay_interrupt_return to a local label powerpc64/elfv1: Only dereference function descriptor for non-text symbols cxl: Export library to support IBM XSL powerpc/dts: Use #include "..." to include local DT powerpc/perf/hv-24x7: Aggregate result elements on POWER9 SMT8 ...
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/cpuidle-powernv.c53
-rw-r--r--drivers/cpuidle/cpuidle-pseries.c22
2 files changed, 47 insertions, 28 deletions
diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c
index 12409a519cc5..37b0698b7193 100644
--- a/drivers/cpuidle/cpuidle-powernv.c
+++ b/drivers/cpuidle/cpuidle-powernv.c
@@ -32,18 +32,18 @@ static struct cpuidle_driver powernv_idle_driver = {
.owner = THIS_MODULE,
};
-static int max_idle_state;
-static struct cpuidle_state *cpuidle_state_table;
+static int max_idle_state __read_mostly;
+static struct cpuidle_state *cpuidle_state_table __read_mostly;
struct stop_psscr_table {
u64 val;
u64 mask;
};
-static struct stop_psscr_table stop_psscr_table[CPUIDLE_STATE_MAX];
+static struct stop_psscr_table stop_psscr_table[CPUIDLE_STATE_MAX] __read_mostly;
-static u64 snooze_timeout;
-static bool snooze_timeout_en;
+static u64 snooze_timeout __read_mostly;
+static bool snooze_timeout_en __read_mostly;
static int snooze_loop(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
@@ -51,21 +51,30 @@ static int snooze_loop(struct cpuidle_device *dev,
{
u64 snooze_exit_time;
- local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
+ local_irq_enable();
+
snooze_exit_time = get_tb() + snooze_timeout;
ppc64_runlatch_off();
HMT_very_low();
while (!need_resched()) {
- if (likely(snooze_timeout_en) && get_tb() > snooze_exit_time)
+ if (likely(snooze_timeout_en) && get_tb() > snooze_exit_time) {
+ /*
+ * Task has not woken up but we are exiting the polling
+ * loop anyway. Require a barrier after polling is
+ * cleared to order subsequent test of need_resched().
+ */
+ clear_thread_flag(TIF_POLLING_NRFLAG);
+ smp_mb();
break;
+ }
}
HMT_medium();
ppc64_runlatch_on();
clear_thread_flag(TIF_POLLING_NRFLAG);
- smp_mb();
+
return index;
}
@@ -73,9 +82,8 @@ static int nap_loop(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
- ppc64_runlatch_off();
- power7_idle();
- ppc64_runlatch_on();
+ power7_idle_type(PNV_THREAD_NAP);
+
return index;
}
@@ -98,7 +106,8 @@ static int fastsleep_loop(struct cpuidle_device *dev,
new_lpcr &= ~LPCR_PECE1;
mtspr(SPRN_LPCR, new_lpcr);
- power7_sleep();
+
+ power7_idle_type(PNV_THREAD_SLEEP);
mtspr(SPRN_LPCR, old_lpcr);
@@ -110,10 +119,8 @@ static int stop_loop(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
- ppc64_runlatch_off();
- power9_idle_stop(stop_psscr_table[index].val,
+ power9_idle_type(stop_psscr_table[index].val,
stop_psscr_table[index].mask);
- ppc64_runlatch_on();
return index;
}
@@ -354,6 +361,7 @@ 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;
/*
* If an idle state has exit latency beyond
* POWERNV_THRESHOLD_LATENCY_NS then don't use it
@@ -381,6 +389,9 @@ static int powernv_add_idle_states(void)
}
}
+ if (flags[i] & OPAL_PM_TIMEBASE_STOP)
+ stops_timebase = true;
+
/*
* For nap and fastsleep, use default target_residency
* values if f/w does not expose it.
@@ -392,8 +403,7 @@ 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 ((flags[i] & OPAL_PM_STOP_INST_FAST) &&
- !(flags[i] & OPAL_PM_TIMEBASE_STOP)) {
+ } else if (has_stop_states && !stops_timebase) {
add_powernv_state(nr_idle_states, names[i],
CPUIDLE_FLAG_NONE, stop_loop,
target_residency, exit_latency,
@@ -405,8 +415,8 @@ static int powernv_add_idle_states(void)
* within this config dependency check.
*/
#ifdef CONFIG_TICK_ONESHOT
- if (flags[i] & OPAL_PM_SLEEP_ENABLED ||
- flags[i] & OPAL_PM_SLEEP_ENABLED_ER1) {
+ else if (flags[i] & OPAL_PM_SLEEP_ENABLED ||
+ flags[i] & OPAL_PM_SLEEP_ENABLED_ER1) {
if (!rc)
target_residency = 300000;
/* Add FASTSLEEP state */
@@ -414,14 +424,15 @@ static int powernv_add_idle_states(void)
CPUIDLE_FLAG_TIMER_STOP,
fastsleep_loop,
target_residency, exit_latency, 0, 0);
- } else if ((flags[i] & OPAL_PM_STOP_INST_DEEP) &&
- (flags[i] & OPAL_PM_TIMEBASE_STOP)) {
+ } else if (has_stop_states && stops_timebase) {
add_powernv_state(nr_idle_states, names[i],
CPUIDLE_FLAG_TIMER_STOP, stop_loop,
target_residency, exit_latency,
psscr_val[i], psscr_mask[i]);
}
#endif
+ else
+ continue;
nr_idle_states++;
}
out:
diff --git a/drivers/cpuidle/cpuidle-pseries.c b/drivers/cpuidle/cpuidle-pseries.c
index 166ccd711ec9..e9b3853d93ea 100644
--- a/drivers/cpuidle/cpuidle-pseries.c
+++ b/drivers/cpuidle/cpuidle-pseries.c
@@ -25,10 +25,10 @@ struct cpuidle_driver pseries_idle_driver = {
.owner = THIS_MODULE,
};
-static int max_idle_state;
-static struct cpuidle_state *cpuidle_state_table;
-static u64 snooze_timeout;
-static bool snooze_timeout_en;
+static int max_idle_state __read_mostly;
+static struct cpuidle_state *cpuidle_state_table __read_mostly;
+static u64 snooze_timeout __read_mostly;
+static bool snooze_timeout_en __read_mostly;
static inline void idle_loop_prolog(unsigned long *in_purr)
{
@@ -62,21 +62,29 @@ static int snooze_loop(struct cpuidle_device *dev,
unsigned long in_purr;
u64 snooze_exit_time;
+ set_thread_flag(TIF_POLLING_NRFLAG);
+
idle_loop_prolog(&in_purr);
local_irq_enable();
- set_thread_flag(TIF_POLLING_NRFLAG);
snooze_exit_time = get_tb() + snooze_timeout;
while (!need_resched()) {
HMT_low();
HMT_very_low();
- if (snooze_timeout_en && get_tb() > snooze_exit_time)
+ if (likely(snooze_timeout_en) && get_tb() > snooze_exit_time) {
+ /*
+ * Task has not woken up but we are exiting the polling
+ * loop anyway. Require a barrier after polling is
+ * cleared to order subsequent test of need_resched().
+ */
+ clear_thread_flag(TIF_POLLING_NRFLAG);
+ smp_mb();
break;
+ }
}
HMT_medium();
clear_thread_flag(TIF_POLLING_NRFLAG);
- smp_mb();
idle_loop_epilog(in_purr);