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s390/pai_crypto: Add common pai_read() function

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To support one common PAI PMU device driver which handles
both PMUs pai_crypto and pai_ext, use a common naming scheme
for structures and variables suitable for both device drivers.

Add a common usable function pai_read() to read counter values.
The function expects a PAI PMU specific read function as second
parameter.

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 15:38:53 +01:00 committed by Heiko Carstens
parent 74466e87e7
commit 8f6116fd49
1 changed files with 9 additions and 4 deletions
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13
arch/s390/kernel/perf_pai_crypto.c
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@ -365,18 +365,23 @@ static int paicrypt_event_init(struct perf_event *event)
return rc;
}
static void paicrypt_read(struct perf_event *event)
static void pai_read(struct perf_event *event,
u64 (*fct)(struct perf_event *event))
{
u64 prev, new, delta;
prev = local64_read(&event->hw.prev_count);
new = paicrypt_getall(event);
new = fct(event);
local64_set(&event->hw.prev_count, new);
delta = (prev <= new) ? new - prev
: (-1ULL - prev) + new + 1; /* overflow */
delta = (prev <= new) ? new - prev : (-1ULL - prev) + new + 1;
local64_add(delta, &event->count);
}
static void paicrypt_read(struct perf_event *event)
{
pai_read(event, paicrypt_getall);
}
static void paicrypt_start(struct perf_event *event, int flags)
{
struct pai_mapptr *mp = this_cpu_ptr(pai_root.mapptr);