diff options
| author | Anup Patel <apatel@ventanamicro.com> | 2023-03-28 09:22:20 +0530 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2023-04-08 11:26:24 +0100 |
| commit | fb0f3d281b7f81a11e210783940f3798c4744179 (patch) | |
| tree | 146c5fa6ba26a9c8079ff4d908aa8d606d9af3d5 /arch/riscv/kernel/smp.c | |
| parent | 832f15f42646812b096bc67c0eac439291a0db1f (diff) | |
RISC-V: Allow marking IPIs as suitable for remote FENCEs
To do remote FENCEs (i.e. remote TLB flushes) using IPI calls on the
RISC-V kernel, we need hardware mechanism to directly inject IPI from
the supervisor mode (i.e. RISC-V kernel) instead of using SBI calls.
The upcoming AIA IMSIC devices allow direct IPI injection from the
supervisor mode (i.e. RISC-V kernel). To support this, we extend the
riscv_ipi_set_virq_range() function so that IPI provider (i.e. irqchip
drivers can mark IPIs as suitable for remote FENCEs.
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230328035223.1480939-5-apatel@ventanamicro.com
Diffstat (limited to 'arch/riscv/kernel/smp.c')
| -rw-r--r-- | arch/riscv/kernel/smp.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c index 47e7ecfedb4d..5f985a197eff 100644 --- a/arch/riscv/kernel/smp.c +++ b/arch/riscv/kernel/smp.c @@ -177,7 +177,10 @@ bool riscv_ipi_have_virq_range(void) return (ipi_virq_base) ? true : false; } -void riscv_ipi_set_virq_range(int virq, int nr) +DEFINE_STATIC_KEY_FALSE(riscv_ipi_for_rfence); +EXPORT_SYMBOL_GPL(riscv_ipi_for_rfence); + +void riscv_ipi_set_virq_range(int virq, int nr, bool use_for_rfence) { int i, err; @@ -200,6 +203,12 @@ void riscv_ipi_set_virq_range(int virq, int nr) /* Enabled IPIs for boot CPU immediately */ riscv_ipi_enable(); + + /* Update RFENCE static key */ + if (use_for_rfence) + static_branch_enable(&riscv_ipi_for_rfence); + else + static_branch_disable(&riscv_ipi_for_rfence); } static const char * const ipi_names[] = { |