[v8, 02/10] riscv: vector: make Vector always available for softirq context

[Andy Chiu]

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 at sifive.com>
---
Changelog v8:
 - refine comments, fix typos (Eric)
Changelog v4:
 - new patch since v4
---
 arch/riscv/include/asm/simd.h          |  6 +++++-
 arch/riscv/kernel/kernel_mode_vector.c | 14 ++++++++++++--
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/include/asm/simd.h b/arch/riscv/include/asm/simd.h
index 3b603e47c5d8..2f1e95ccb03c 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_ctx_cnt() & RISCV_KERNEL_MODE_V_MASK);
+	return !in_hardirq() && !in_nmi() && !irqs_disabled() && !(riscv_v_ctx_cnt() & RISCV_KERNEL_MODE_V_MASK);
 }
 
 #else /* ! CONFIG_RISCV_ISA_V */
diff --git a/arch/riscv/kernel/kernel_mode_vector.c b/arch/riscv/kernel/kernel_mode_vector.c
index 105147c7d2da..385d9b4d8cc6 100644
--- a/arch/riscv/kernel/kernel_mode_vector.c
+++ b/arch/riscv/kernel/kernel_mode_vector.c
@@ -23,7 +23,14 @@
  */
 void get_cpu_vector_context(void)
 {
-	preempt_disable();
+	/*
+	 * disable softirqs so it is impossible for softirqs to nest
+	 * get_cpu_vector_context() when kernel is actively using Vector.
+	 */
+	if (!IS_ENABLED(CONFIG_PREEMPT_RT))
+		local_bh_disable();
+	else
+		preempt_disable();
 
 	WARN_ON((riscv_v_ctx_cnt() & RISCV_KERNEL_MODE_V_MASK) != 0);
 	riscv_v_ctx_cnt_add(RISCV_KERNEL_MODE_V);
@@ -41,7 +48,10 @@ void put_cpu_vector_context(void)
 	WARN_ON((riscv_v_ctx_cnt() & RISCV_KERNEL_MODE_V_MASK) != RISCV_KERNEL_MODE_V);
 	riscv_v_ctx_cnt_sub(RISCV_KERNEL_MODE_V);
 
-	preempt_enable();
+	if (!IS_ENABLED(CONFIG_PREEMPT_RT))
+		local_bh_enable();
+	else
+		preempt_enable();
 }
 
 /*
-- 
2.17.1