From 84609efe92d8c9fb33d250f872602023bb99e81a Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Mon, 24 Apr 2017 09:04:03 +0100 Subject: [PATCH] BACKPORT: arm64: Add CNTFRQ_EL0 trap handler We now trap accesses to CNTVCT_EL0 when the counter is broken enough to require the kernel to mediate the access. But it turns out that some existing userspace (such as OpenMPI) do probe for the counter frequency, leading to an UNDEF exception as CNTVCT_EL0 and CNTFRQ_EL0 share the same control bit. The fix is to handle the exception the same way we do for CNTVCT_EL0. Fixes: a86bd139f2ae ("arm64: arch_timer: Enable CNTVCT_EL0 trap if workaround is enabled") Reported-by: Hanjun Guo Tested-by: Hanjun Guo Reviewed-by: Hanjun Guo Signed-off-by: Marc Zyngier Signed-off-by: Catalin Marinas (cherry picked from commit 9842119a238bfb92cbab63258dabb54f0e7b111b) Change-Id: I2f163e2511bab6225f319c0a9e732735cbd108a0 Signed-off-by: Neeraj Upadhyay --- arch/arm64/include/asm/esr.h | 3 +++ arch/arm64/kernel/traps.c | 12 ++++++++++++ 2 files changed, 15 insertions(+) diff --git a/arch/arm64/include/asm/esr.h b/arch/arm64/include/asm/esr.h index f40f2f4a4e84..2d4e9c26f8f6 100644 --- a/arch/arm64/include/asm/esr.h +++ b/arch/arm64/include/asm/esr.h @@ -146,6 +146,9 @@ #define ESR_ELx_SYS64_ISS_SYS_CNTVCT (ESR_ELx_SYS64_ISS_SYS_VAL(3, 3, 2, 14, 0) | \ ESR_ELx_SYS64_ISS_DIR_READ) +#define ESR_ELx_SYS64_ISS_SYS_CNTFRQ (ESR_ELx_SYS64_ISS_SYS_VAL(3, 3, 0, 14, 0) | \ + ESR_ELx_SYS64_ISS_DIR_READ) + #ifndef __ASSEMBLY__ #include diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index 9ced1f3f6c48..9ee50ed48132 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -458,11 +458,23 @@ static void cntvct_read_handler(unsigned int esr, struct pt_regs *regs) regs->pc += 4; } +static void cntfrq_read_handler(unsigned int esr, struct pt_regs *regs) +{ + int rt = (esr & ESR_ELx_SYS64_ISS_RT_MASK) >> ESR_ELx_SYS64_ISS_RT_SHIFT; + + if (rt != 31) + regs->regs[rt] = read_sysreg(cntfrq_el0); + regs->pc += 4; +} + asmlinkage void __exception do_sysinstr(unsigned int esr, struct pt_regs *regs) { if ((esr & ESR_ELx_SYS64_ISS_SYS_OP_MASK) == ESR_ELx_SYS64_ISS_SYS_CNTVCT) { cntvct_read_handler(esr, regs); return; + } else if ((esr & ESR_ELx_SYS64_ISS_SYS_OP_MASK) == ESR_ELx_SYS64_ISS_SYS_CNTFRQ) { + cntfrq_read_handler(esr, regs); + return; } do_undefinstr(regs);