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| author | Andy Chiu <andy.chiu@sifive.com> | 2024-01-15 06:59:21 +0100 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2024-01-16 16:13:54 +0100 |
| commit | 956895b9d8f74df015636288a81872c07c4fded3 (patch) | |
| tree | 91a43342507b1ab31236576fb521d814e0e38d44 /arch/riscv/include/asm/simd.h | |
| parent | riscv: Add support for kernel mode vector (diff) | |
| download | linux-956895b9d8f74df015636288a81872c07c4fded3.tar.xz linux-956895b9d8f74df015636288a81872c07c4fded3.zip | |
riscv: vector: make Vector always available for softirq context
The goal of this patch is to provide full support of Vector in kernel
softirq context. So that some of the crypto alogrithms won't need scalar
fallbacks.
By disabling bottom halves in active kernel-mode Vector, softirq will
not be able to nest on top of any kernel-mode Vector. So, softirq
context is able to use Vector whenever it runs.
After this patch, Vector context cannot start with irqs disabled.
Otherwise local_bh_enable() may run in a wrong context.
Disabling bh is not enough for RT-kernel to prevent preeemption. So
we must disable preemption, which also implies disabling bh on RT.
Related-to: commit 696207d4258b ("arm64/sve: Make kernel FPU protection RT friendly")
Related-to: commit 66c3ec5a7120 ("arm64: neon: Forbid when irqs are disabled")
Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Tested-by: Björn Töpel <bjorn@rivosinc.com>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20240115055929.4736-3-andy.chiu@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/include/asm/simd.h')
| -rw-r--r-- | arch/riscv/include/asm/simd.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/riscv/include/asm/simd.h b/arch/riscv/include/asm/simd.h index ef8af413a9fc..4d699e16c9a9 100644 --- a/arch/riscv/include/asm/simd.h +++ b/arch/riscv/include/asm/simd.h @@ -28,8 +28,12 @@ static __must_check inline bool may_use_simd(void) /* * RISCV_KERNEL_MODE_V is only set while preemption is disabled, * and is clear whenever preemption is enabled. + * + * Kernel-mode Vector temporarily disables bh. So we must not return + * true on irq_disabled(). Otherwise we would fail the lockdep check + * calling local_bh_enable() */ - return !in_hardirq() && !in_nmi() && !(riscv_v_flags() & RISCV_KERNEL_MODE_V); + return !in_hardirq() && !in_nmi() && !irqs_disabled() && !(riscv_v_flags() & RISCV_KERNEL_MODE_V); } #else /* ! CONFIG_RISCV_ISA_V */ |