diff mbox series

[v4,08/20] arch_topology: Add support to parse and detect cache attributes

Message ID 20220621192034.3332546-9-sudeep.holla@arm.com (mailing list archive)
State New, archived
Headers show
Series arch_topology: Updates to add socket support and fix cluster ids | expand

Commit Message

Sudeep Holla June 21, 2022, 7:20 p.m. UTC 
Currently ACPI populates just the minimum information about the last
level cache from PPTT in order to feed the same to build sched_domains.
Similar support for DT platforms is not present.

In order to enable the same, the entire cache hierarchy information can
be built as part of CPU topoplogy parsing both on ACPI and DT platforms.

Note that this change builds the cacheinfo early even on ACPI systems, but
the current mechanism of building llc_sibling mask remains unchanged.

Reviewed-by: Gavin Shan <gshan@redhat.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
 drivers/base/arch_topology.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index 579c851a2bd7..23cb52180ce3 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -7,6 +7,7 @@ 
  */
 
 #include <linux/acpi.h>
+#include <linux/cacheinfo.h>
 #include <linux/cpu.h>
 #include <linux/cpufreq.h>
 #include <linux/device.h>
@@ -780,15 +781,23 @@  __weak int __init parse_acpi_topology(void)
 #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
 void __init init_cpu_topology(void)
 {
+	int ret, cpu;
+
 	reset_cpu_topology();
+	ret = parse_acpi_topology();
+	if (!ret)
+		ret = of_have_populated_dt() && parse_dt_topology();
 
-	/*
-	 * Discard anything that was parsed if we hit an error so we
-	 * don't use partial information.
-	 */
-	if (parse_acpi_topology())
-		reset_cpu_topology();
-	else if (of_have_populated_dt() && parse_dt_topology())
+	if (ret) {
+		/*
+		 * Discard anything that was parsed if we hit an error so we
+		 * don't use partial information.
+		 */
 		reset_cpu_topology();
+		return;
+	}
+
+	for_each_possible_cpu(cpu)
+		detect_cache_attributes(cpu);
 }
 #endif