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s390/pai_crypto: replace atomic_t with refcount_t

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The s390 PMU of PAI crypto counters uses atomic_t for reference
counting. Replace this with the proper data type refcount_t.

No functional change.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Acked-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Thomas Richter 2023-04-24 08:53:55 +02:00 committed by Alexander Gordeev
parent f1fcbaa18b
commit ecc758cee6
1 changed files with 11 additions and 8 deletions
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19
arch/s390/kernel/perf_pai_crypto.c
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@ -36,7 +36,7 @@ struct paicrypt_map {
unsigned long *page; /* Page for CPU to store counters */
struct pai_userdata *save; /* Page to store no-zero counters */
unsigned int active_events; /* # of PAI crypto users */
unsigned int refcnt; /* Reference count mapped buffers */
refcount_t refcnt; /* Reference count mapped buffers */
enum paievt_mode mode; /* Type of event */
struct perf_event *event; /* Perf event for sampling */
};
@ -57,10 +57,11 @@ static void paicrypt_event_destroy(struct perf_event *event)
static_branch_dec(&pai_key);
mutex_lock(&pai_reserve_mutex);
debug_sprintf_event(cfm_dbg, 5, "%s event %#llx cpu %d users %d"
" mode %d refcnt %d\n", __func__,
" mode %d refcnt %u\n", __func__,
event->attr.config, event->cpu,
cpump->active_events, cpump->mode, cpump->refcnt);
if (!--cpump->refcnt) {
cpump->active_events, cpump->mode,
refcount_read(&cpump->refcnt));
if (refcount_dec_and_test(&cpump->refcnt)) {
debug_sprintf_event(cfm_dbg, 4, "%s page %#lx save %p\n",
__func__, (unsigned long)cpump->page,
cpump->save);
@ -149,8 +150,10 @@ static int paicrypt_busy(struct perf_event_attr *a, struct paicrypt_map *cpump)
/* Allocate memory for counter page and counter extraction.
* Only the first counting event has to allocate a page.
*/
if (cpump->page)
if (cpump->page) {
refcount_inc(&cpump->refcnt);
goto unlock;
}
rc = -ENOMEM;
cpump->page = (unsigned long *)get_zeroed_page(GFP_KERNEL);
@ -164,18 +167,18 @@ static int paicrypt_busy(struct perf_event_attr *a, struct paicrypt_map *cpump)
goto unlock;
}
rc = 0;
refcount_set(&cpump->refcnt, 1);
unlock:
/* If rc is non-zero, do not set mode and reference count */
if (!rc) {
cpump->refcnt++;
cpump->mode = a->sample_period ? PAI_MODE_SAMPLING
: PAI_MODE_COUNTING;
}
debug_sprintf_event(cfm_dbg, 5, "%s sample_period %#llx users %d"
" mode %d refcnt %d page %#lx save %p rc %d\n",
" mode %d refcnt %u page %#lx save %p rc %d\n",
__func__, a->sample_period, cpump->active_events,
cpump->mode, cpump->refcnt,
cpump->mode, refcount_read(&cpump->refcnt),
(unsigned long)cpump->page, cpump->save, rc);
mutex_unlock(&pai_reserve_mutex);
return rc;