From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx> Lockdep is needed by proving the spinlocks and rwlocks. To suupport it, we need fixup TRACE_IRQFLAGS_SUPPORT in kernel/entry.S. This patch follow Documentation/irqflags-tracing.txt. Signed-off-by: Guo Ren <guoren@xxxxxxxxxxxxxxxxx> --- arch/riscv/Kconfig | 3 +++ arch/riscv/kernel/entry.S | 41 ++++++++++++++++++++++++++++++++++++++++- 2 files changed, 43 insertions(+), 1 deletion(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index a31e1a4..550e0ec 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -170,6 +170,9 @@ config PGTABLE_LEVELS default 3 if 64BIT default 2 +config LOCKDEP_SUPPORT + def_bool y + source "arch/riscv/Kconfig.socs" menu "Platform type" diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S index 56d071b..02c5b8e 100644 --- a/arch/riscv/kernel/entry.S +++ b/arch/riscv/kernel/entry.S @@ -97,17 +97,25 @@ _save_context: la gp, __global_pointer$ .option pop - la ra, ret_from_exception +#ifdef CONFIG_TRACE_IRQFLAGS + call trace_hardirqs_off +#endif /* * MSB of cause differentiates between * interrupts and exceptions */ bge s4, zero, 1f + la ra, ret_from_exception + /* Handle interrupts */ move a0, sp /* pt_regs */ tail do_IRQ 1: +#ifdef CONFIG_TRACE_IRQFLAGS + call trace_hardirqs_on + REG_L s1, PT_STATUS(sp) +#endif /* * Exceptions run with interrupts enabled or disabled depending on the * state of SR_PIE in m/sstatus. @@ -117,8 +125,23 @@ _save_context: csrs CSR_STATUS, SR_IE 1: +#ifdef CONFIG_TRACE_IRQFLAGS + REG_L a0, PT_A0(sp) + REG_L a1, PT_A1(sp) + REG_L a2, PT_A2(sp) + REG_L a3, PT_A3(sp) + REG_L a4, PT_A4(sp) + REG_L a5, PT_A5(sp) + REG_L a6, PT_A6(sp) + REG_L a7, PT_A7(sp) +#endif + la ra, ret_from_exception /* Handle syscalls */ li t0, EXC_SYSCALL + +#ifdef CONFIG_TRACE_IRQFLAGS + REG_L s4, PT_CAUSE(sp) +#endif beq s4, t0, handle_syscall /* Handle other exceptions */ @@ -141,6 +164,9 @@ handle_syscall: * Advance SEPC to avoid executing the original * scall instruction on sret */ +#ifdef CONFIG_TRACE_IRQFLAGS + REG_L s2, PT_EPC(sp) +#endif addi s2, s2, 0x4 REG_S s2, PT_EPC(sp) /* Trace syscalls, but only if requested by the user. */ @@ -188,6 +214,9 @@ ret_from_syscall_rejected: ret_from_exception: REG_L s0, PT_STATUS(sp) csrc CSR_STATUS, SR_IE +#ifdef CONFIG_TRACE_IRQFLAGS + call trace_hardirqs_off +#endif #ifdef CONFIG_RISCV_M_MODE /* the MPP value is too large to be used as an immediate arg for addi */ li t0, SR_MPP @@ -214,6 +243,16 @@ resume_userspace: csrw CSR_SCRATCH, tp restore_all: +#ifdef CONFIG_TRACE_IRQFLAGS + REG_L s1, PT_STATUS(sp) + andi t0, s1, SR_PIE + beqz t0, 1f + call trace_hardirqs_on + j 2f +1: + call trace_hardirqs_off +2: +#endif REG_L a0, PT_STATUS(sp) /* * The current load reservation is effectively part of the processor's -- 2.7.4
