The supervisor binary interface (SBI) provides the necessary functions to implement the platform IPI functions riscv_send_ipi() and riscv_clear_ipi(). Use it to implement them.
This adds support for inter-processor interrupts (IPIs) on RISC-V CPUs running in supervisor mode. Support for machine mode is already available for CPUs that include the SiFive CLINT.
Signed-off-by: Lukas Auer lukas.auer@aisec.fraunhofer.de Reviewed-by: Anup Patel anup.patel@wdc.com Reviewed-by: Bin Meng bmeng.cn@gmail.com Reviewed-by: Atish Patra atish.patra@wdc.com Tested-by: Bin Meng bmeng.cn@gmail.com ---
Changes in v3: None Changes in v2: None
arch/riscv/Kconfig | 5 +++++ arch/riscv/lib/Makefile | 1 + arch/riscv/lib/sbi_ipi.c | 25 +++++++++++++++++++++++++ 3 files changed, 31 insertions(+) create mode 100644 arch/riscv/lib/sbi_ipi.c
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 4d7a115569..9da609b33b 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -139,4 +139,9 @@ config NR_CPUS Stack memory is pre-allocated. U-Boot must therefore know the maximum number of CPUs that may be present.
+config SBI_IPI + bool + default y if RISCV_SMODE + depends on SMP + endmenu diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile index 19370f9749..35dbf643e4 100644 --- a/arch/riscv/lib/Makefile +++ b/arch/riscv/lib/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_RISCV_RDTIME) += rdtime.o obj-$(CONFIG_SIFIVE_CLINT) += sifive_clint.o obj-y += interrupts.o obj-y += reset.o +obj-$(CONFIG_SBI_IPI) += sbi_ipi.o obj-y += setjmp.o obj-$(CONFIG_SMP) += smp.o
diff --git a/arch/riscv/lib/sbi_ipi.c b/arch/riscv/lib/sbi_ipi.c new file mode 100644 index 0000000000..170346da68 --- /dev/null +++ b/arch/riscv/lib/sbi_ipi.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2019 Fraunhofer AISEC, + * Lukas Auer lukas.auer@aisec.fraunhofer.de + */ + +#include <common.h> +#include <asm/sbi.h> + +int riscv_send_ipi(int hart) +{ + ulong mask; + + mask = 1UL << hart; + sbi_send_ipi(&mask); + + return 0; +} + +int riscv_clear_ipi(int hart) +{ + sbi_clear_ipi(); + + return 0; +}