From: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Add the sched_smt_active() function needed for some x86 speculation
mitigations. This was introduced upstream by commits 1b568f0aabf2
"sched/core: Optimize SCHED_SMT", ba2591a5993e "sched/smt: Update
sched_smt_present at runtime", c5511d03ec09 "sched/smt: Make
sched_smt_present track topology", and 321a874a7ef8 "sched/smt: Expose
sched_smt_present static key". The upstream implementation uses the
static_key_{disable,enable}_cpuslocked() functions, which aren't
practical to backport.
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/linux/sched/smt.h | 18 ++++++++++++++++++
kernel/sched/core.c | 24 ++++++++++++++++++++++++
kernel/sched/sched.h | 1 +
3 files changed, 43 insertions(+)
create mode 100644 include/linux/sched/smt.h
--- /dev/null
+++ b/include/linux/sched/smt.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_SCHED_SMT_H
+#define _LINUX_SCHED_SMT_H
+
+#include <linux/atomic.h>
+
+#ifdef CONFIG_SCHED_SMT
+extern atomic_t sched_smt_present;
+
+static __always_inline bool sched_smt_active(void)
+{
+ return atomic_read(&sched_smt_present);
+}
+#else
+static inline bool sched_smt_active(void) { return false; }
+#endif
+
+#endif
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5610,6 +5610,10 @@ static void set_cpu_rq_start_time(void)
rq->age_stamp = sched_clock_cpu(cpu);
}
+#ifdef CONFIG_SCHED_SMT
+atomic_t sched_smt_present = ATOMIC_INIT(0);
+#endif
+
static int sched_cpu_active(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
@@ -5626,11 +5630,23 @@ static int sched_cpu_active(struct notif
* set_cpu_online(). But it might not yet have marked itself
* as active, which is essential from here on.
*/
+#ifdef CONFIG_SCHED_SMT
+ /*
+ * When going up, increment the number of cores with SMT present.
+ */
+ if (cpumask_weight(cpu_smt_mask(cpu)) == 2)
+ atomic_inc(&sched_smt_present);
+#endif
set_cpu_active(cpu, true);
stop_machine_unpark(cpu);
return NOTIFY_OK;
case CPU_DOWN_FAILED:
+#ifdef CONFIG_SCHED_SMT
+ /* Same as for CPU_ONLINE */
+ if (cpumask_weight(cpu_smt_mask(cpu)) == 2)
+ atomic_inc(&sched_smt_present);
+#endif
set_cpu_active(cpu, true);
return NOTIFY_OK;
@@ -5645,7 +5661,15 @@ static int sched_cpu_inactive(struct not
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_DOWN_PREPARE:
set_cpu_active((long)hcpu, false);
+#ifdef CONFIG_SCHED_SMT
+ /*
+ * When going down, decrement the number of cores with SMT present.
+ */
+ if (cpumask_weight(cpu_smt_mask((long)hcpu)) == 2)
+ atomic_dec(&sched_smt_present);
+#endif
return NOTIFY_OK;
+
default:
return NOTIFY_DONE;
}
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2,6 +2,7 @@
#include <linux/sched.h>
#include <linux/sched/sysctl.h>
#include <linux/sched/rt.h>
+#include <linux/sched/smt.h>
#include <linux/sched/deadline.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
