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powerpc/smp: Move powerpc_topology above

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Just moving the powerpc_topology description above.
This will help in using functions in this file and avoid declarations.

No other functional changes

Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200810071834.92514-4-srikar@linux.vnet.ibm.com
This commit is contained in:
Srikar Dronamraju
2020-08-10 12:48:27 +05:30
committed by Michael Ellerman
parent 2ef0ca54d9
commit 5e93f16ae4
1 changed files with 52 additions and 52 deletions
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104
arch/powerpc/kernel/smp.c
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@@ -819,6 +819,58 @@ out:
return err; return err;
} }
static bool shared_caches;
#ifdef CONFIG_SCHED_SMT
/* cpumask of CPUs with asymmetric SMT dependency */
static int powerpc_smt_flags(void)
{
int flags = SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES;
if (cpu_has_feature(CPU_FTR_ASYM_SMT)) {
printk_once(KERN_INFO "Enabling Asymmetric SMT scheduling\n");
flags |= SD_ASYM_PACKING;
}
return flags;
}
#endif
/*
* P9 has a slightly odd architecture where pairs of cores share an L2 cache.
* This topology makes it *much* cheaper to migrate tasks between adjacent cores
* since the migrated task remains cache hot. We want to take advantage of this
* at the scheduler level so an extra topology level is required.
*/
static int powerpc_shared_cache_flags(void)
{
return SD_SHARE_PKG_RESOURCES;
}
/*
* We can't just pass cpu_l2_cache_mask() directly because
* returns a non-const pointer and the compiler barfs on that.
*/
static const struct cpumask *shared_cache_mask(int cpu)
{
return cpu_l2_cache_mask(cpu);
}
#ifdef CONFIG_SCHED_SMT
static const struct cpumask *smallcore_smt_mask(int cpu)
{
return cpu_smallcore_mask(cpu);
}
#endif
static struct sched_domain_topology_level powerpc_topology[] = {
#ifdef CONFIG_SCHED_SMT
{ cpu_smt_mask, powerpc_smt_flags, SD_INIT_NAME(SMT) },
#endif
{ shared_cache_mask, powerpc_shared_cache_flags, SD_INIT_NAME(CACHE) },
{ cpu_cpu_mask, SD_INIT_NAME(DIE) },
{ NULL, },
};
static int init_big_cores(void) static int init_big_cores(void)
{ {
int cpu; int cpu;
@@ -1248,8 +1300,6 @@ static void add_cpu_to_masks(int cpu)
set_cpus_related(cpu, i, cpu_core_mask); set_cpus_related(cpu, i, cpu_core_mask);
} }
static bool shared_caches;
/* Activate a secondary processor. */ /* Activate a secondary processor. */
void start_secondary(void *unused) void start_secondary(void *unused)
{ {
@@ -1313,56 +1363,6 @@ int setup_profiling_timer(unsigned int multiplier)
return 0; return 0;
} }
#ifdef CONFIG_SCHED_SMT
/* cpumask of CPUs with asymmetric SMT dependency */
static int powerpc_smt_flags(void)
{
int flags = SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES;
if (cpu_has_feature(CPU_FTR_ASYM_SMT)) {
printk_once(KERN_INFO "Enabling Asymmetric SMT scheduling\n");
flags |= SD_ASYM_PACKING;
}
return flags;
}
#endif
/*
* P9 has a slightly odd architecture where pairs of cores share an L2 cache.
* This topology makes it *much* cheaper to migrate tasks between adjacent cores
* since the migrated task remains cache hot. We want to take advantage of this
* at the scheduler level so an extra topology level is required.
*/
static int powerpc_shared_cache_flags(void)
{
return SD_SHARE_PKG_RESOURCES;
}
/*
* We can't just pass cpu_l2_cache_mask() directly because
* returns a non-const pointer and the compiler barfs on that.
*/
static const struct cpumask *shared_cache_mask(int cpu)
{
return cpu_l2_cache_mask(cpu);
}
#ifdef CONFIG_SCHED_SMT
static const struct cpumask *smallcore_smt_mask(int cpu)
{
return cpu_smallcore_mask(cpu);
}
#endif
static struct sched_domain_topology_level powerpc_topology[] = {
#ifdef CONFIG_SCHED_SMT
{ cpu_smt_mask, powerpc_smt_flags, SD_INIT_NAME(SMT) },
#endif
{ shared_cache_mask, powerpc_shared_cache_flags, SD_INIT_NAME(CACHE) },
{ cpu_cpu_mask, SD_INIT_NAME(DIE) },
{ NULL, },
};
void __init smp_cpus_done(unsigned int max_cpus) void __init smp_cpus_done(unsigned int max_cpus)
{ {
/* /*