Commit 28d43de7 authored by Vijay Kumar's avatar Vijay Kumar Committed by David S. Miller
Browse files

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: default avatarRob Gardner <rob.gardner@oracle.com>
Signed-off-by: default avatarVijay Kumar <vijay.ac.kumar@oracle.com>
Reviewed-by: default avatarAnthony Yznaga <anthony.yznaga@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 99274b81

arch/sparc/include/asm/hypervisor.h

+18 −0
Original line number Diff line number Diff line
@@ -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

arch/sparc/kernel/hvcalls.S

+11 −0
Original line number Diff line number Diff line
@@ -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

CRA Git | Maintained and supported by SUSTech CRA and CCSE