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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 <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Neuling 2018-03-27 15:37:17 +11:00 committed by Michael Ellerman
parent 681c617b7c
commit 404b27d66e
2 changed files with 13 additions and 0 deletions
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1
arch/powerpc/include/asm/debug.h
View File

@ -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);

12
arch/powerpc/kernel/process.c
View File

@ -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