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authorJacob Shin <jacob.w.shin@gmail.com>2014-05-29 19:26:50 +0400
committerFrederic Weisbecker <fweisbec@gmail.com>2014-12-03 17:14:26 +0300
commitd6d55f0b9d900673548515614b56ab55aa2c51f8 (patch)
tree2c5d9bdff4444fec201a014e071e718a0f34d8aa /arch/x86/include/asm/debugreg.h
parent4e6e311e596eadba30d4f56f64eae7d45611a01c (diff)
downloadlinux-d6d55f0b9d900673548515614b56ab55aa2c51f8.tar.xz
perf/x86/amd: AMD support for bp_len > HW_BREAKPOINT_LEN_8
Implement hardware breakpoint address mask for AMD Family 16h and above processors. CPUID feature bit indicates hardware support for DRn_ADDR_MASK MSRs. These masks further qualify DRn/DR7 hardware breakpoint addresses to allow matching of larger addresses ranges. Valuable advice and pseudo code from Oleg Nesterov <oleg@redhat.com> Signed-off-by: Jacob Shin <jacob.w.shin@gmail.com> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Cc: Ingo Molnar <mingo@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: xiakaixu <xiakaixu@huawei.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'arch/x86/include/asm/debugreg.h')
-rw-r--r--arch/x86/include/asm/debugreg.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/include/asm/debugreg.h b/arch/x86/include/asm/debugreg.h
index 61fd18b83b6c..12cb66f6d3a5 100644
--- a/arch/x86/include/asm/debugreg.h
+++ b/arch/x86/include/asm/debugreg.h
@@ -114,5 +114,10 @@ static inline void debug_stack_usage_inc(void) { }
static inline void debug_stack_usage_dec(void) { }
#endif /* X86_64 */
+#ifdef CONFIG_CPU_SUP_AMD
+extern void set_dr_addr_mask(unsigned long mask, int dr);
+#else
+static inline void set_dr_addr_mask(unsigned long mask, int dr) { }
+#endif
#endif /* _ASM_X86_DEBUGREG_H */