linux-kernel - [PATCH v6 02/17] ARM: Revert back to default scheduler topology.

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Message-Id: <20200817113003.20802-3-valentin.schneider@arm.com>
Date:   Mon, 17 Aug 2020 12:29:48 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Russell King <linux@...linux.org.uk>,
        Dietmar Eggemann <dietmar.eggemann@....com>, mingo@...nel.org,
        peterz@...radead.org, vincent.guittot@...aro.org,
        morten.rasmussen@....com, Quentin Perret <qperret@...gle.com>
Subject: [PATCH v6 02/17] ARM: Revert back to default scheduler topology.

The ARM-specific GMC level is meant to be built using the thread sibling
mask, but no devicetree in arch/arm/boot/dts uses the 'thread' cpu-map
binding. With SD_SHARE_POWERDOMAIN gone, this topology level can be
removed, at which point ARM no longer benefits from having a custom defined
topology table.

Delete the GMC topology level by making ARM use the default scheduler
topology table. This essentially reverts commit

  fb2aa85564f4 ("sched, ARM: Create a dedicated scheduler topology table")

No change in functionality is expected.

Cc: Russell King <linux@...linux.org.uk>
Suggested-by: Dietmar Eggemann <dietmar.eggemann@....com>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@....com>
Signed-off-by: Valentin Schneider <valentin.schneider@....com>
---
 arch/arm/kernel/topology.c | 26 --------------------------
 1 file changed, 26 deletions(-)

diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index 353f3ee660e4..ef0058de432b 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -177,15 +177,6 @@ static inline void parse_dt_topology(void) {}
 static inline void update_cpu_capacity(unsigned int cpuid) {}
 #endif
 
-/*
- * The current assumption is that we can power gate each core independently.
- * This will be superseded by DT binding once available.
- */
-const struct cpumask *cpu_corepower_mask(int cpu)
-{
-	return &cpu_topology[cpu].thread_sibling;
-}
-
 /*
  * store_cpu_topology is called at boot when only one cpu is running
  * and with the mutex cpu_hotplug.lock locked, when several cpus have booted,
@@ -241,20 +232,6 @@ void store_cpu_topology(unsigned int cpuid)
 	update_siblings_masks(cpuid);
 }
 
-static inline int cpu_corepower_flags(void)
-{
-	return SD_SHARE_PKG_RESOURCES;
-}
-
-static struct sched_domain_topology_level arm_topology[] = {
-#ifdef CONFIG_SCHED_MC
-	{ cpu_corepower_mask, cpu_corepower_flags, SD_INIT_NAME(GMC) },
-	{ cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
-#endif
-	{ cpu_cpu_mask, SD_INIT_NAME(DIE) },
-	{ NULL, },
-};
-
 /*
  * init_cpu_topology is called at boot when only one cpu is running
  * which prevent simultaneous write access to cpu_topology array
@@ -265,7 +242,4 @@ void __init init_cpu_topology(void)
 	smp_wmb();
 
 	parse_dt_topology();
-
-	/* Set scheduler topology descriptor */
-	set_sched_topology(arm_topology);
 }
-- 
2.27.0