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| author | Michael Neuling <mikey@neuling.org> | 2018-03-27 07:37:17 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-03-27 15:52:43 +0300 |
| commit | 404b27d66ed657ebccb08a9c8f8f65523e9b666b (patch) | |
| tree | 8ec4a5895cc333f47bb7ff4c4ab2c9acedca17f6 | |
| parent | 681c617b7c42fce0798c2b0b472f270f28c82d56 (diff) | |
| download | linux-404b27d66ed657ebccb08a9c8f8f65523e9b666b.tar.xz | |
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>
| -rw-r--r-- | arch/powerpc/include/asm/debug.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/kernel/process.c | 12 |
2 files changed, 13 insertions, 0 deletions
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 |