linux-kernel - [PATCH v3 06/16] arch_topology: Add support to parse and detect cache attributes

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Message-Id: <20220525081416.3306043-7-sudeep.holla@arm.com>
Date:   Wed, 25 May 2022 09:14:06 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Sudeep Holla <sudeep.holla@....com>,
        Atish Patra <atishp@...shpatra.org>,
        Atish Patra <atishp@...osinc.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Qing Wang <wangqing@...o.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, Rob Herring <robh+dt@...nel.org>
Subject: [PATCH v3 06/16] arch_topology: Add support to parse and detect cache attributes

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.

Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
 drivers/base/arch_topology.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index f73b836047cf..765723448b10 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>
@@ -775,15 +776,23 @@ __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
-- 
2.36.1