perf/x86/intel: Add PMU support for Clearwater Forest

From the PMU's perspective, Clearwater Forest is similar to the previous
generation Sierra Forest.

The key differences are the ARCH PEBS feature and the new added 3 fixed
counters for topdown L1 metrics events.

The ARCH PEBS is supported in the following patches. This patch provides
support for basic perfmon features and 3 new added fixed counters.

Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20250415114428.341182-3-dapeng1.mi@linux.intel.com

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index f107dd826c11398b62e8e8fee1f4ce8ed81d7176..adc0187a81a08c0ea9cd25a3a8f36a35e7912b02 100644 (file)
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -2224,6 +2224,18 @@ static struct extra_reg intel_cmt_extra_regs[] __read_mostly = {
        EVENT_EXTRA_END
 };
 
+EVENT_ATTR_STR(topdown-fe-bound,       td_fe_bound_skt,        "event=0x9c,umask=0x01");
+EVENT_ATTR_STR(topdown-retiring,       td_retiring_skt,        "event=0xc2,umask=0x02");
+EVENT_ATTR_STR(topdown-be-bound,       td_be_bound_skt,        "event=0xa4,umask=0x02");
+
+static struct attribute *skt_events_attrs[] = {
+       EVENT_PTR(td_fe_bound_skt),
+       EVENT_PTR(td_retiring_skt),
+       EVENT_PTR(td_bad_spec_cmt),
+       EVENT_PTR(td_be_bound_skt),
+       NULL,
+};
+
 #define KNL_OT_L2_HITE         BIT_ULL(19) /* Other Tile L2 Hit */
 #define KNL_OT_L2_HITF         BIT_ULL(20) /* Other Tile L2 Hit */
 #define KNL_MCDRAM_LOCAL       BIT_ULL(21)
@@ -7142,6 +7154,18 @@ __init int intel_pmu_init(void)
                name = "crestmont";
                break;
 
+       case INTEL_ATOM_DARKMONT_X:
+               intel_pmu_init_skt(NULL);
+               intel_pmu_pebs_data_source_cmt();
+               x86_pmu.pebs_latency_data = cmt_latency_data;
+               x86_pmu.get_event_constraints = cmt_get_event_constraints;
+               td_attr = skt_events_attrs;
+               mem_attr = grt_mem_attrs;
+               extra_attr = cmt_format_attr;
+               pr_cont("Darkmont events, ");
+               name = "darkmont";
+               break;
+
        case INTEL_WESTMERE:
        case INTEL_WESTMERE_EP:
        case INTEL_WESTMERE_EX: