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90ae281437
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 <lukas.auer@aisec.fraunhofer.de> Reviewed-by: Rick Chen <rick@andestech.com> Tested-by: Rick Chen <rick@andestech.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2019 Fraunhofer AISEC,
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* Lukas Auer <lukas.auer@aisec.fraunhofer.de>
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*/
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#ifndef _ASM_RISCV_SMP_H
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#define _ASM_RISCV_SMP_H
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/**
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* struct ipi_data - Inter-processor interrupt (IPI) data structure
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*
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* IPIs are used for SMP support to communicate to other harts what function to
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* call. Functions are in the form
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* void (*addr)(ulong hart, ulong arg0, ulong arg1).
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*
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* The function address and the two arguments, arg0 and arg1, are stored in the
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* IPI data structure. The hart ID is inserted by the hart handling the IPI and
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* calling the function.
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*
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* @addr: Address of function
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* @arg0: First argument of function
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* @arg1: Second argument of function
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*/
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struct ipi_data {
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ulong addr;
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ulong arg0;
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ulong arg1;
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};
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/**
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* handle_ipi() - interrupt handler for software interrupts
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*
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* The IPI interrupt handler must be called to handle software interrupts. It
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* calls the function specified in the hart's IPI data structure.
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*
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* @hart: Hart ID of the current hart
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*/
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void handle_ipi(ulong hart);
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/**
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* smp_call_function() - Call a function on all other harts
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*
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* Send IPIs with the specified function call to all harts.
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*
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* @addr: Address of function
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* @arg0: First argument of function
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* @arg1: Second argument of function
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* @wait: Wait for harts to acknowledge request
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* @return 0 if OK, -ve on error
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*/
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int smp_call_function(ulong addr, ulong arg0, ulong arg1, int wait);
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#endif
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