linux-kernel - [PATCH 4/6] ACPI / PPTT: Populate the cacheinfo.cpu_affinity

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Date:   Thu, 16 Dec 2021 17:31:23 -0600
From:   Rob Herring <robh@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        James Morse <james.morse@....com>,
        Jeremy Linton <jeremy.linton@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Sudeep Holla <sudeep.holla@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, devicetree@...r.kernel.org,
        linux-acpi@...r.kernel.org
Subject: [PATCH 4/6] ACPI / PPTT: Populate the cacheinfo.cpu_affinity_map

The cacheinfo.cpu_affinity_map was added to list the possible CPUs a
cache is associated with. Populate the cpu_affinity_map when parsing the
ACPI PPTT for cacheinfo. With this, the cache CPU affinities are
represented in the same way for DT and ACPI.

Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Len Brown <lenb@...nel.org>
Cc: linux-acpi@...r.kernel.org
Signed-off-by: Rob Herring <robh@...nel.org>
---
 drivers/acpi/pptt.c | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
index 701f61c01359..686018f4e7ed 100644
--- a/drivers/acpi/pptt.c
+++ b/drivers/acpi/pptt.c
@@ -418,6 +418,30 @@ static void update_cache_properties(struct cacheinfo *this_leaf,
 	}
 }
 
+static void acpi_set_cache_cpumask(struct acpi_table_header *table,
+				   struct cacheinfo *this_leaf,
+				   struct acpi_pptt_processor *match_cpu_node)
+{
+	int cpu;
+
+	/*
+	 * If we found the cache first, we'd still need to walk from each cpu.
+	 */
+	for_each_possible_cpu(cpu) {
+		u32 acpi_cpu_id = get_acpi_id_for_cpu(cpu);
+		struct acpi_pptt_processor *cpu_node;
+		struct acpi_pptt_cache *cache;
+
+		cache = acpi_find_cache_node(table, acpi_cpu_id,
+					     this_leaf->type,
+					     this_leaf->level, &cpu_node);
+		if (!cache || cpu_node != match_cpu_node)
+			continue;
+
+		cpumask_set_cpu(cpu, &this_leaf->cpu_affinity_map);
+	}
+}
+
 static void cache_setup_acpi_cpu(struct acpi_table_header *table,
 				 unsigned int cpu)
 {
@@ -435,10 +459,11 @@ static void cache_setup_acpi_cpu(struct acpi_table_header *table,
 						   this_leaf->level,
 						   &cpu_node);
 		pr_debug("found = %p %p\n", found_cache, cpu_node);
-		if (found_cache)
+		if (found_cache) {
 			update_cache_properties(this_leaf, found_cache,
 			                        cpu_node, table->revision);
-
+			acpi_set_cache_cpumask(table, this_leaf, cpu_node);
+		}
 		index++;
 	}
 }
-- 
2.32.0