platform/x86/intel-uncore-freq: Do not present separate package-die domain

JIRA: https://issues.redhat.com/browse/RHEL-46062

commit bb9a9bf
Author: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Date:   Tue Aug 20 13:45:58 2024 -0700

    platform/x86/intel-uncore-freq: Do not present separate package-die domain

    The scope of uncore control is per power domain with TPMI.

    There are two types of processor topologies can be presented by CPUID
    extended topology leaf irrespective of the hardware architecture:

    1. A die is not enumerated in CPUID. In this case there is only one die
    in a package is visible. In this case there can be multiple power domains
    in a single die.
    2. A power domain in a package is enumerated as a die in CPUID. So
    there is one power domain per die.

    To allow die level controls, the current implementation creates a root
    domain and aggregates all information from power domains in it. This
    is well suited for configuration 1 above.

    But for configuration 2 above, the root domain will present the same
    information as present by power domain. So, no use of aggregating. To
    check the configuration, call topology_max_dies_per_package(). If it is
    more than one, avoid creating root domain.

    Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
    Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
    Link: https://lore.kernel.org/r/20240820204558.1296319-1-srinivas.pandruvada@linux.intel.com
    Reviewed-by: Hans de Goede <hdegoede@redhat.com>
    Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Signed-off-by: David Arcari <darcari@redhat.com>

Author: darcari

drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c

@@ -427,6 +427,9 @@ static int uncore_probe(struct auxiliary_device *auxdev, const struct auxiliary_
 
 	auxiliary_set_drvdata(auxdev, tpmi_uncore);
 
+	if (topology_max_dies_per_package() > 1)
+		return 0;
+
 	tpmi_uncore->root_cluster.root_domain = true;
 	tpmi_uncore->root_cluster.uncore_root = tpmi_uncore;
 
@@ -450,7 +453,9 @@ static void uncore_remove(struct auxiliary_device *auxdev)
 {
 	struct tpmi_uncore_struct *tpmi_uncore = auxiliary_get_drvdata(auxdev);
 
-	uncore_freq_remove_die_entry(&tpmi_uncore->root_cluster.uncore_data);
+	if (tpmi_uncore->root_cluster.root_domain)
+		uncore_freq_remove_die_entry(&tpmi_uncore->root_cluster.uncore_data);
+
 	remove_cluster_entries(tpmi_uncore);
 
 	uncore_freq_common_exit();