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| author | Paul Burton <paul.burton@imgtec.com> | 2014-02-14 20:30:52 +0400 |
|---|---|---|
| committer | Paul Burton <paul.burton@imgtec.com> | 2014-05-02 19:39:13 +0400 |
| commit | 76306f4272e036e600254a98bc291df50cedd949 (patch) | |
| tree | c06e7c4a48fe4b5276747bc3ad03fa22918689e7 | |
| parent | cc7964af8f997a20240d3ec5bf90c4fd20d3c48a (diff) | |
| download | linux-76306f4272e036e600254a98bc291df50cedd949.tar.xz | |
MIPS: introduce cpu_coherent_mask
Add a mask of CPUs which are currently known to be operating coherently.
This is setup initially to be all present CPUs, but in a subsequent
patch CPUs in a MIPS Coherent Processing System will be cleared in this
mask as they enter non-coherent idle states. This will be used in order
to determine when a CPU within a CPS system may need to be powered back
up, but may also be used in future to optimise away wakeups for cache
operations or TLB invalidations.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
| -rw-r--r-- | arch/mips/include/asm/smp.h | 3 | ||||
| -rw-r--r-- | arch/mips/kernel/smp.c | 4 |
2 files changed, 7 insertions, 0 deletions
diff --git a/arch/mips/include/asm/smp.h b/arch/mips/include/asm/smp.h index efa02acd3dd5..b037334fca22 100644 --- a/arch/mips/include/asm/smp.h +++ b/arch/mips/include/asm/smp.h @@ -46,6 +46,9 @@ extern int __cpu_logical_map[NR_CPUS]; extern volatile cpumask_t cpu_callin_map; +/* Mask of CPUs which are currently definitely operating coherently */ +extern cpumask_t cpu_coherent_mask; + extern void asmlinkage smp_bootstrap(void); /* diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c index 9a5226443bc1..991ae968ef26 100644 --- a/arch/mips/kernel/smp.c +++ b/arch/mips/kernel/smp.c @@ -66,6 +66,8 @@ EXPORT_SYMBOL(cpu_sibling_map); /* representing cpus for which sibling maps can be computed */ static cpumask_t cpu_sibling_setup_map; +cpumask_t cpu_coherent_mask; + static inline void set_cpu_sibling_map(int cpu) { int i; @@ -124,6 +126,7 @@ asmlinkage void start_secondary(void) cpu = smp_processor_id(); cpu_data[cpu].udelay_val = loops_per_jiffy; + cpu_set(cpu, cpu_coherent_mask); notify_cpu_starting(cpu); set_cpu_online(cpu, true); @@ -186,6 +189,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus) #ifndef CONFIG_HOTPLUG_CPU init_cpu_present(cpu_possible_mask); #endif + cpumask_copy(&cpu_coherent_mask, cpu_possible_mask); } /* preload SMP state for boot cpu */ |