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Commit 404b27d6 authored by Michael Neuling's avatar Michael Neuling Committed by Michael Ellerman
Browse files

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: default avatarMichael Neuling <mikey@neuling.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 681c617b

arch/powerpc/include/asm/debug.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

arch/powerpc/kernel/process.c

+12 −0
Original line number Diff line number Diff line
@@ -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