From 90ae28143700bae4edd23930a7772899ad259058 Mon Sep 17 00:00:00 2001 From: Lukas Auer Date: Sun, 8 Dec 2019 23:28:51 +0100 Subject: riscv: add option to wait for ack from secondary harts in smp functions Add a wait option to smp_call_function() to wait for the secondary harts to acknowledge the call-function request. The request is considered to be acknowledged once each secondary hart has cleared the corresponding IPI. As part of the call-function request, the secondary harts invalidate the instruction cache after clearing the IPI. This adds a delay between acknowledgment (clear IPI) and fulfillment (call function) of the request. We want to use the acknowledgment to be able to judge when the request has been completed. Remove the delay by clearing the IPI after cache invalidation and just before calling the function from the request. Signed-off-by: Lukas Auer Reviewed-by: Rick Chen Tested-by: Rick Chen Reviewed-by: Anup Patel --- arch/riscv/include/asm/smp.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'arch/riscv/include/asm') diff --git a/arch/riscv/include/asm/smp.h b/arch/riscv/include/asm/smp.h index bc863fdbaf..74de92ed13 100644 --- a/arch/riscv/include/asm/smp.h +++ b/arch/riscv/include/asm/smp.h @@ -46,8 +46,9 @@ void handle_ipi(ulong hart); * @addr: Address of function * @arg0: First argument of function * @arg1: Second argument of function + * @wait: Wait for harts to acknowledge request * @return 0 if OK, -ve on error */ -int smp_call_function(ulong addr, ulong arg0, ulong arg1); +int smp_call_function(ulong addr, ulong arg0, ulong arg1, int wait); #endif -- cgit