diff options
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/mp.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/x86/include/asm/mp.h b/arch/x86/include/asm/mp.h index f9d6c8e6bf..9379826b6b 100644 --- a/arch/x86/include/asm/mp.h +++ b/arch/x86/include/asm/mp.h @@ -118,6 +118,33 @@ int mp_run_on_cpus(int cpu_select, mp_run_func func, void *arg); * @return 0 if OK, -ve on error */ int mp_park_aps(void); + +/** + * mp_first_cpu() - Get the first CPU to process, from a selection + * + * This is used to iterate through selected CPUs. Call this function first, then + * call mp_next_cpu() repeatedly (with the same @cpu_select) until it returns + * -EFBIG. + * + * @cpu_select: Selected CPUs (either a CPU number or MP_SELECT_...) + * @return next CPU number to run on (e.g. 0) + */ +int mp_first_cpu(int cpu_select); + +/** + * mp_next_cpu() - Get the next CPU to process, from a selection + * + * This is used to iterate through selected CPUs. After first calling + * mp_first_cpu() once, call this function repeatedly until it returns -EFBIG. + * + * The value of @cpu_select must be the same for all calls and must match the + * value passed to mp_first_cpu(), otherwise the behaviour is undefined. + * + * @cpu_select: Selected CPUs (either a CPU number or MP_SELECT_...) + * @prev_cpu: Previous value returned by mp_first_cpu()/mp_next_cpu() + * @return next CPU number to run on (e.g. 0) + */ +int mp_next_cpu(int cpu_select, int prev_cpu); #else static inline int mp_run_on_cpus(int cpu_select, mp_run_func func, void *arg) { @@ -134,6 +161,21 @@ static inline int mp_park_aps(void) return 0; } +static inline int mp_first_cpu(int cpu_select) +{ + /* We cannot run on any APs, nor a selected CPU */ + return cpu_select == MP_SELECT_APS ? -EFBIG : MP_SELECT_BSP; +} + +static inline int mp_next_cpu(int cpu_select, int prev_cpu) +{ + /* + * When MP is not enabled, there is only one CPU and we did it in + * mp_first_cpu() + */ + return -EFBIG; +} + #endif #endif /* _X86_MP_H_ */ |