This is a note to let you know that I've just added the patch titled
s390/pai: rework paiXXX_start and paiXXX_stop functions
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-pai-rework-paixxx_start-and-paixxx_stop-functio.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 35023a996c2aa5ff04d6bb194d1acd3280dc0d11
Author: Thomas Richter <tmricht@xxxxxxxxxxxxx>
Date: Wed Nov 15 11:04:25 2023 +0100
s390/pai: rework paiXXX_start and paiXXX_stop functions
[ Upstream commit cb1259b7b574bd90ef22dac2c6282327cdae31c6 ]
The PAI crypto counter and PAI NNPA counters start and stop functions
are streamlined. Move the conditions to invoke start and stop functions
to its respective function body and call them unconditionally.
The start and stop functions now determine how to proceed.
No functional change.
Signed-off-by: Thomas Richter <tmricht@xxxxxxxxxxxxx>
Acked-by: Mete Durlu <meted@xxxxxxxxxxxxx>
Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Stable-dep-of: e9f3af02f639 ("s390/pai: fix sampling event removal for PMU device driver")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/s390/kernel/perf_pai_crypto.c b/arch/s390/kernel/perf_pai_crypto.c
index 3758e972bb5f9..ba2d2e61df747 100644
--- a/arch/s390/kernel/perf_pai_crypto.c
+++ b/arch/s390/kernel/perf_pai_crypto.c
@@ -245,10 +245,14 @@ static void paicrypt_start(struct perf_event *event, int flags)
* Events are added, deleted and re-added when 2 or more events
* are active at the same time.
*/
- if (!event->hw.last_tag) {
- event->hw.last_tag = 1;
- sum = paicrypt_getall(event); /* Get current value */
- local64_set(&event->hw.prev_count, sum);
+ if (!event->attr.sample_period) { /* Counting */
+ if (!event->hw.last_tag) {
+ event->hw.last_tag = 1;
+ sum = paicrypt_getall(event); /* Get current value */
+ local64_set(&event->hw.prev_count, sum);
+ }
+ } else { /* Sampling */
+ perf_sched_cb_inc(event->pmu);
}
}
@@ -263,19 +267,18 @@ static int paicrypt_add(struct perf_event *event, int flags)
__ctl_set_bit(0, 50);
}
cpump->event = event;
- if (flags & PERF_EF_START && !event->attr.sample_period) {
- /* Only counting needs initial counter value */
+ if (flags & PERF_EF_START)
paicrypt_start(event, PERF_EF_RELOAD);
- }
event->hw.state = 0;
- if (event->attr.sample_period)
- perf_sched_cb_inc(event->pmu);
return 0;
}
static void paicrypt_stop(struct perf_event *event, int flags)
{
- paicrypt_read(event);
+ if (!event->attr.sample_period) /* Counting */
+ paicrypt_read(event);
+ else /* Sampling */
+ perf_sched_cb_dec(event->pmu);
event->hw.state = PERF_HES_STOPPED;
}
@@ -283,11 +286,7 @@ static void paicrypt_del(struct perf_event *event, int flags)
{
struct paicrypt_map *cpump = this_cpu_ptr(&paicrypt_map);
- if (event->attr.sample_period)
- perf_sched_cb_dec(event->pmu);
- if (!event->attr.sample_period)
- /* Only counting needs to read counter */
- paicrypt_stop(event, PERF_EF_UPDATE);
+ paicrypt_stop(event, PERF_EF_UPDATE);
if (--cpump->active_events == 0) {
__ctl_clear_bit(0, 50);
WRITE_ONCE(S390_lowcore.ccd, 0);
diff --git a/arch/s390/kernel/perf_pai_ext.c b/arch/s390/kernel/perf_pai_ext.c
index 53915401c3f63..09aebfcf679df 100644
--- a/arch/s390/kernel/perf_pai_ext.c
+++ b/arch/s390/kernel/perf_pai_ext.c
@@ -327,11 +327,15 @@ static void paiext_start(struct perf_event *event, int flags)
{
u64 sum;
- if (event->hw.last_tag)
- return;
- event->hw.last_tag = 1;
- sum = paiext_getall(event); /* Get current value */
- local64_set(&event->hw.prev_count, sum);
+ if (!event->attr.sample_period) { /* Counting */
+ if (!event->hw.last_tag) {
+ event->hw.last_tag = 1;
+ sum = paiext_getall(event); /* Get current value */
+ local64_set(&event->hw.prev_count, sum);
+ }
+ } else { /* Sampling */
+ perf_sched_cb_inc(event->pmu);
+ }
}
static int paiext_add(struct perf_event *event, int flags)
@@ -348,21 +352,19 @@ static int paiext_add(struct perf_event *event, int flags)
debug_sprintf_event(paiext_dbg, 4, "%s 1508 %llx acc %llx\n",
__func__, S390_lowcore.aicd, pcb->acc);
}
- if (flags & PERF_EF_START && !event->attr.sample_period) {
- /* Only counting needs initial counter value */
+ cpump->event = event;
+ if (flags & PERF_EF_START)
paiext_start(event, PERF_EF_RELOAD);
- }
event->hw.state = 0;
- if (event->attr.sample_period) {
- cpump->event = event;
- perf_sched_cb_inc(event->pmu);
- }
return 0;
}
static void paiext_stop(struct perf_event *event, int flags)
{
- paiext_read(event);
+ if (!event->attr.sample_period) /* Counting */
+ paiext_read(event);
+ else /* Sampling */
+ perf_sched_cb_dec(event->pmu);
event->hw.state = PERF_HES_STOPPED;
}
@@ -372,12 +374,7 @@ static void paiext_del(struct perf_event *event, int flags)
struct paiext_map *cpump = mp->mapptr;
struct paiext_cb *pcb = cpump->paiext_cb;
- if (event->attr.sample_period)
- perf_sched_cb_dec(event->pmu);
- if (!event->attr.sample_period) {
- /* Only counting needs to read counter */
- paiext_stop(event, PERF_EF_UPDATE);
- }
+ paiext_stop(event, PERF_EF_UPDATE);
if (--cpump->active_events == 0) {
/* Disable CPU instruction lookup for PAIE1 control block */
__ctl_clear_bit(0, 49);
