This adds a new hypercall CPU_POKE for quickly waking up an idle CPU. CPU_POKE should only be sent to valid non-local CPUs. Signed-off-by: Rob Gardner <rob.gardner@xxxxxxxxxx> Signed-off-by: Vijay Kumar <vijay.ac.kumar@xxxxxxxxxx> Reviewed-by: Anthony Yznaga <anthony.yznaga@xxxxxxxxxx> --- arch/sparc/include/asm/hypervisor.h | 18 ++++++++++++++++++ arch/sparc/kernel/hvcalls.S | 11 +++++++++++ 2 files changed, 29 insertions(+), 0 deletions(-) diff --git a/arch/sparc/include/asm/hypervisor.h b/arch/sparc/include/asm/hypervisor.h index 73cb897..3dc9215 100644 --- a/arch/sparc/include/asm/hypervisor.h +++ b/arch/sparc/include/asm/hypervisor.h @@ -298,6 +298,24 @@ unsigned long sun4v_cpu_start(unsigned long cpuid, unsigned long sun4v_cpu_yield(void); #endif +/* cpu_poke() + * TRAP: HV_FAST_TRAP + * FUNCTION: HV_FAST_CPU_POKE + * RET0: status + * ERRORS: ENOCPU cpuid refers to a CPU that does not exist + * EINVAL cpuid is current CPU + * + * Poke CPU cpuid. If the target CPU is currently suspended having + * invoked the cpu-yield service, that vCPU will be resumed. + * Poke interrupts may only be sent to valid, non-local CPUs. + * It is not legal to poke the current vCPU. + */ +#define HV_FAST_CPU_POKE 0x13 + +#ifndef __ASSEMBLY__ +unsigned long sun4v_cpu_poke(unsigned long cpuid); +#endif + /* cpu_qconf() * TRAP: HV_FAST_TRAP * FUNCTION: HV_FAST_CPU_QCONF diff --git a/arch/sparc/kernel/hvcalls.S b/arch/sparc/kernel/hvcalls.S index 4116ee5..e57007f 100644 --- a/arch/sparc/kernel/hvcalls.S +++ b/arch/sparc/kernel/hvcalls.S @@ -106,6 +106,17 @@ ENTRY(sun4v_cpu_yield) nop ENDPROC(sun4v_cpu_yield) + /* %o0: cpuid + * + * returns %o0: status + */ +ENTRY(sun4v_cpu_poke) + mov HV_FAST_CPU_POKE, %o5 + ta HV_FAST_TRAP + retl + nop +ENDPROC(sun4v_cpu_poke) + /* %o0: type * %o1: queue paddr * %o2: num queue entries -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
