ARM: Add HMP scheduling support for ARM architecture

Adds Kconfig entries to enable HMP scheduling on ARM platforms.
Currently, it disables CPU level sched_domain load-balacing in order
to simplify things. This needs fixing in a later revision. HMP
scheduling will do the load-balancing at this level instead.

Signed-off-by: Morten Rasmussen <Morten.Rasmussen@arm.com>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 6157ed8e0e3ec30431d4c3317c752068a3d5842f..99d41f9633bbe839e1c32c0d1f6b6113b4c978dc 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1524,6 +1524,20 @@ config SCHED_HMP_PRIO_FILTER_VAL
        default 5
        depends on SCHED_HMP_PRIO_FILTER
 
+config HMP_FAST_CPU_MASK
+       string "HMP scheduler fast CPU mask"
+       depends on SCHED_HMP
+       help
+          Specify the cpuids of the fast CPUs in the system as a list string,
+         e.g. cpuid 0+1 should be specified as 0-1.
+
+config HMP_SLOW_CPU_MASK
+       string "HMP scheduler slow CPU mask"
+       depends on SCHED_HMP
+       help
+         Specify the cpuids of the slow CPUs in the system as a list string,
+         e.g. cpuid 0+1 should be specified as 0-1.
+
 config HAVE_ARM_SCU
        bool
        help

diff --git a/arch/arm/include/asm/topology.h b/arch/arm/include/asm/topology.h
index 58b8b84adcd2cf5f295e6869b68350f9dcadc798..5692ba11322d494ece74118cad07378b3714d31b 100644 (file)
--- a/arch/arm/include/asm/topology.h
+++ b/arch/arm/include/asm/topology.h
@@ -27,6 +27,37 @@ void init_cpu_topology(void);
 void store_cpu_topology(unsigned int cpuid);
 const struct cpumask *cpu_coregroup_mask(int cpu);
 
+#ifdef CONFIG_DISABLE_CPU_SCHED_DOMAIN_BALANCE
+/* Common values for CPUs */
+#ifndef SD_CPU_INIT
+#define SD_CPU_INIT (struct sched_domain) {                            \
+       .min_interval           = 1,                                    \
+       .max_interval           = 4,                                    \
+       .busy_factor            = 64,                                   \
+       .imbalance_pct          = 125,                                  \
+       .cache_nice_tries       = 1,                                    \
+       .busy_idx               = 2,                                    \
+       .idle_idx               = 1,                                    \
+       .newidle_idx            = 0,                                    \
+       .wake_idx               = 0,                                    \
+       .forkexec_idx           = 0,                                    \
+                                                                       \
+       .flags                  = 0*SD_LOAD_BALANCE                     \
+                               | 1*SD_BALANCE_NEWIDLE                  \
+                               | 1*SD_BALANCE_EXEC                     \
+                               | 1*SD_BALANCE_FORK                     \
+                               | 0*SD_BALANCE_WAKE                     \
+                               | 1*SD_WAKE_AFFINE                      \
+                               | 0*SD_SHARE_CPUPOWER                   \
+                               | 0*SD_SHARE_PKG_RESOURCES              \
+                               | 0*SD_SERIALIZE                        \
+                               ,                                       \
+       .last_balance            = jiffies,                             \
+       .balance_interval       = 1,                                    \
+}
+#endif
+#endif /* CONFIG_DISABLE_CPU_SCHED_DOMAIN_BALANCE */
+
 #else
 
 static inline void init_cpu_topology(void) { }