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| author | Vijay Kumar <vijay.ac.kumar@oracle.com> | 2017-07-21 10:23:56 -0600 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-08-09 22:15:10 -0700 |
| commit | 28d43de741cc67a9d8748de7dcb6c5f54cfa669c (patch) | |
| tree | 5a45e75d3d4b7a392a6b68d9ae69c27dd9071159 /arch | |
| parent | 99274b818a5dc7c3226866970a0cec0d40ed5f0f (diff) | |
| download | linux-28d43de741cc67a9d8748de7dcb6c5f54cfa669c.tar.bz2 | |
sparc64: Add a new hypercall CPU_POKE
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@oracle.com>
Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc/include/asm/hypervisor.h | 18 | ||||
| -rw-r--r-- | 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 73cb8978df58..3dc9215d0357 100644 --- a/arch/sparc/include/asm/hypervisor.h +++ b/arch/sparc/include/asm/hypervisor.h @@ -298,6 +298,24 @@ unsigned long sun4v_cpu_stop(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 4116ee5c7791..e57007ff7f8f 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 |