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s390/pai_crypto: Unify sample push logic and update context handling

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Unify naming and logic for PAI PMU drivers to support both PMUs
pai_crypto and pai_ext.

Rename paicrypt_push_sample() to pai_push_sample() to reflect
its common usage.  Add detailed comments about invocation context
and scheduler callbacks.  Use struct pai_pmu to determine area_size
instead of PAGE_SIZE for counter backup.
Remove obsolete variable paicrypt_cnt.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Jan Polensky <japo@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Thomas Richter 2025-11-05 15:38:52 +01:00 committed by Heiko Carstens
parent 0f1c0d754a
commit 74466e87e7
1 changed files with 20 additions and 7 deletions
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27
arch/s390/kernel/perf_pai_crypto.c
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@ -20,8 +20,6 @@
#include <asm/debug.h>
static debug_info_t *paidbg;
static unsigned int paicrypt_cnt; /* Size of the mapped counter sets */
/* extracted with QPACI instruction */
DEFINE_STATIC_KEY_FALSE(pai_key);
@ -486,9 +484,25 @@ static size_t paicrypt_copy(struct pai_userdata *userdata, unsigned long *page,
return outidx * sizeof(*userdata);
}
static int paicrypt_push_sample(size_t rawsize, struct pai_map *cpump,
struct perf_event *event)
/* Write sample when one or more counters values are nonzero.
*
* Note: The function paicrypt_sched_task() and pai_push_sample() are not
* invoked after function paicrypt_del() has been called because of function
* perf_sched_cb_dec(). Both functions are only
* called when sampling is active. Function perf_sched_cb_inc()
* has been invoked to install function paicrypt_sched_task() as call back
* to run at context switch time.
*
* This causes function perf_event_context_sched_out() and
* perf_event_context_sched_in() to check whether the PMU has installed an
* sched_task() callback. That callback is not active after paicrypt_del()
* returns and has deleted the event on that CPU.
*/
static int pai_push_sample(size_t rawsize, struct pai_map *cpump,
struct perf_event *event)
{
int idx = PAI_PMU_IDX(event);
struct pai_pmu *pp = &pai_pmu[idx];
struct perf_sample_data data;
struct perf_raw_record raw;
struct pt_regs regs;
@ -520,7 +534,7 @@ static int paicrypt_push_sample(size_t rawsize, struct pai_map *cpump,
overflow = perf_event_overflow(event, &data, &regs);
perf_event_update_userpage(event);
/* Save crypto counter lowcore page after reading event data. */
memcpy((void *)PAI_SAVE_AREA(event), cpump->area, PAGE_SIZE);
memcpy((void *)PAI_SAVE_AREA(event), cpump->area, pp->area_size);
return overflow;
}
@ -538,7 +552,7 @@ static void pai_have_sample(struct perf_event *event, struct pai_map *cpump)
event->attr.exclude_user,
event->attr.exclude_kernel);
if (rawsize) /* No incremented counters */
paicrypt_push_sample(rawsize, cpump, event);
pai_push_sample(rawsize, cpump, event);
}
/* Check if there is data to be saved on schedule out of a task. */
@ -920,7 +934,6 @@ static int __init paipmu_setup(void)
switch (i) {
case PAI_PMU_CRYPTO:
p->num_avail = ib.num_cc;
paicrypt_cnt = ib.num_cc;
if (p->num_avail >= PAI_CRYPTO_MAXCTR) {
pr_err("Too many PMU %s counters %d\n",
p->pmuname, p->num_avail);