diff options
| -rw-r--r-- | arch/arm/include/asm/Kbuild | 1 | ||||
| -rw-r--r-- | arch/arm/include/asm/percpu.h | 45 | ||||
| -rw-r--r-- | arch/arm/kernel/setup.c | 6 | ||||
| -rw-r--r-- | arch/arm/kernel/smp.c | 4 |
4 files changed, 54 insertions, 2 deletions
diff --git a/arch/arm/include/asm/Kbuild b/arch/arm/include/asm/Kbuild index f70ae175a3d6..2ffdaacd461c 100644 --- a/arch/arm/include/asm/Kbuild +++ b/arch/arm/include/asm/Kbuild @@ -16,7 +16,6 @@ generic-y += local64.h generic-y += msgbuf.h generic-y += param.h generic-y += parport.h -generic-y += percpu.h generic-y += poll.h generic-y += resource.h generic-y += sections.h diff --git a/arch/arm/include/asm/percpu.h b/arch/arm/include/asm/percpu.h new file mode 100644 index 000000000000..968c0a14e0a3 --- /dev/null +++ b/arch/arm/include/asm/percpu.h @@ -0,0 +1,45 @@ +/* + * Copyright 2012 Calxeda, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ +#ifndef _ASM_ARM_PERCPU_H_ +#define _ASM_ARM_PERCPU_H_ + +/* + * Same as asm-generic/percpu.h, except that we store the per cpu offset + * in the TPIDRPRW. TPIDRPRW only exists on V6K and V7 + */ +#if defined(CONFIG_SMP) && !defined(CONFIG_CPU_V6) +static inline void set_my_cpu_offset(unsigned long off) +{ + /* Set TPIDRPRW */ + asm volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (off) : "memory"); +} + +static inline unsigned long __my_cpu_offset(void) +{ + unsigned long off; + /* Read TPIDRPRW */ + asm("mrc p15, 0, %0, c13, c0, 4" : "=r" (off) : : "memory"); + return off; +} +#define __my_cpu_offset __my_cpu_offset() +#else +#define set_my_cpu_offset(x) do {} while(0) + +#endif /* CONFIG_SMP */ + +#include <asm-generic/percpu.h> + +#endif /* _ASM_ARM_PERCPU_H_ */ diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index f739fb1d217a..9a89bf4aefe1 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -383,6 +383,12 @@ void cpu_init(void) BUG(); } + /* + * This only works on resume and secondary cores. For booting on the + * boot cpu, smp_prepare_boot_cpu is called after percpu area setup. + */ + set_my_cpu_offset(per_cpu_offset(cpu)); + cpu_proc_init(); /* diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 7eacd84cdc9c..f3a2be5837aa 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -314,9 +314,10 @@ asmlinkage void __cpuinit secondary_start_kernel(void) current->active_mm = mm; cpumask_set_cpu(cpu, mm_cpumask(mm)); + cpu_init(); + printk("CPU%u: Booted secondary processor\n", cpu); - cpu_init(); preempt_disable(); trace_hardirqs_off(); @@ -372,6 +373,7 @@ void __init smp_cpus_done(unsigned int max_cpus) void __init smp_prepare_boot_cpu(void) { + set_my_cpu_offset(per_cpu_offset(smp_processor_id())); } void __init smp_prepare_cpus(unsigned int max_cpus) |