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40686c394e
The previous IPI code initialized the device whenever the first call was made to a riscv_*_ipi function. This made it difficult to determine when the IPI device was initialized. This patch introduces a new function riscv_init_ipi. It is called once during arch_cpu_init_dm. In SPL, it is called in spl_invoke_opensbi. Before this point, no riscv_*_ipi functions should be called. Signed-off-by: Sean Anderson <seanga2@gmail.com> Reviewed-by: Rick Chen <rick@andestech.com>
98 lines
2.5 KiB
C
98 lines
2.5 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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/**
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* riscv_init_ipi() - Initialize inter-process interrupt (IPI) driver
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*
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* Platform code must provide this function. This function is called once after
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* the cpu driver is initialized. No other riscv_*_ipi() calls will be made
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* before this function is called.
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*
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* @return 0 if OK, -ve on error
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*/
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int riscv_init_ipi(void);
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/**
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* riscv_send_ipi() - Send inter-processor interrupt (IPI)
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*
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* Platform code must provide this function.
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*
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* @hart: Hart ID of receiving hart
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* @return 0 if OK, -ve on error
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*/
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int riscv_send_ipi(int hart);
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/**
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* riscv_clear_ipi() - Clear inter-processor interrupt (IPI)
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*
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* Platform code must provide this function.
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*
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* @hart: Hart ID of hart to be cleared
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* @return 0 if OK, -ve on error
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*/
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int riscv_clear_ipi(int hart);
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/**
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* riscv_get_ipi() - Get status of inter-processor interrupt (IPI)
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*
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* Platform code must provide this function.
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*
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* @hart: Hart ID of hart to be checked
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* @pending: Pointer to variable with result of the check,
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* 1 if IPI is pending, 0 otherwise
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* @return 0 if OK, -ve on error
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*/
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int riscv_get_ipi(int hart, int *pending);
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#endif
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