Intel Arrowlake and hwcache events

[Michael Petlan <mpetlan@redhat.com>]

Hello!

Qiao Zhao (CC'd) has found out that there are no hwcache events available
on an Arrowlake system he was testing perf on. We have found out that it
does not work even on 6.12.0-rc6+. Are there still drivers that haven't
been merged yet?

Happens that nothing matches in this loop:

int print_hwcache_events(const struct print_callbacks *print_cb, void *print_state)
[...]
305		for (int type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
306 		for (int op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
307  	 		/* skip invalid cache type */
308 			if (!evsel__is_cache_op_valid(type, op))
309					continue;
310
311			for (int res = 0; res < PERF_COUNT_HW_CACHE_RESULT_MAX; res++) {
312 			char name[64];
313				char alias_name[128];
314				__u64 config;
315				int ret;
316
317				__evsel__hw_cache_type_op_res_name(type, op, res,
318													name, sizeof(name));
319
320				ret = parse_events__decode_legacy_cache(name, pmu->type,
321													&config);
322				if (ret || !is_event_supported(PERF_TYPE_HW_CACHE, config))
323					continue;

Thanks,
Michael