From 404b27d66ed657ebccb08a9c8f8f65523e9b666b Mon Sep 17 00:00:00 2001 From: Michael Neuling Date: Tue, 27 Mar 2018 15:37:17 +1100 Subject: [PATCH] powerpc: Add ppc_breakpoint_available() Add ppc_breakpoint_available() to determine if a breakpoint is available currently via the DAWR or DABR. Signed-off-by: Michael Neuling Signed-off-by: Michael Ellerman --- arch/powerpc/include/asm/debug.h | 1 + arch/powerpc/kernel/process.c | 12 ++++++++++++ 2 files changed, 13 insertions(+) diff --git a/arch/powerpc/include/asm/debug.h b/arch/powerpc/include/asm/debug.h index fc97404de0a3..ce5da214ffe5 100644 --- a/arch/powerpc/include/asm/debug.h +++ b/arch/powerpc/include/asm/debug.h @@ -47,6 +47,7 @@ static inline int debugger_fault_handler(struct pt_regs *regs) { return 0; } void set_breakpoint(struct arch_hw_breakpoint *brk); void __set_breakpoint(struct arch_hw_breakpoint *brk); +bool ppc_breakpoint_available(void); #ifdef CONFIG_PPC_ADV_DEBUG_REGS extern void do_send_trap(struct pt_regs *regs, unsigned long address, unsigned long error_code, int brkpt); diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 1738c4127b32..4466e3db46d4 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -827,6 +827,18 @@ void set_breakpoint(struct arch_hw_breakpoint *brk) preempt_enable(); } +/* Check if we have DAWR or DABR hardware */ +bool ppc_breakpoint_available(void) +{ + if (cpu_has_feature(CPU_FTR_DAWR)) + return true; /* POWER8 DAWR */ + if (cpu_has_feature(CPU_FTR_ARCH_207S)) + return false; /* POWER9 with DAWR disabled */ + /* DABR: Everything but POWER8 and POWER9 */ + return true; +} +EXPORT_SYMBOL_GPL(ppc_breakpoint_available); + #ifdef CONFIG_PPC64 DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array); #endif -- 2.30.2