diff options
| author | Suzuki K. Poulose <suzuki.poulose@arm.com> | 2015-10-19 14:24:54 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2015-10-21 15:35:59 +0100 |
| commit | 3085bb01b40676d946a13064483ab2819ae3b010 (patch) | |
| tree | 89c04738eea71181db2fd293e6fd1afb5582eeba /arch/arm64/include | |
| parent | fe80f9f2da1006a4308c2bc018ee1d67f10dd8d0 (diff) | |
| download | linux-3085bb01b40676d946a13064483ab2819ae3b010.tar.gz linux-3085bb01b40676d946a13064483ab2819ae3b010.tar.bz2 linux-3085bb01b40676d946a13064483ab2819ae3b010.zip | |
arm64/debug: Make use of the system wide safe value
Use the system wide value of ID_AA64DFR0 to make safer decisions
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
Tested-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/hw_breakpoint.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/hw_breakpoint.h b/arch/arm64/include/asm/hw_breakpoint.h index 4c47cb2fbb52..e54415ec6935 100644 --- a/arch/arm64/include/asm/hw_breakpoint.h +++ b/arch/arm64/include/asm/hw_breakpoint.h @@ -17,6 +17,7 @@ #define __ASM_HW_BREAKPOINT_H #include <asm/cputype.h> +#include <asm/cpufeature.h> #ifdef __KERNEL__ @@ -137,13 +138,17 @@ extern struct pmu perf_ops_bp; /* Determine number of BRP registers available. */ static inline int get_num_brps(void) { - return ((read_cpuid(ID_AA64DFR0_EL1) >> 12) & 0xf) + 1; + return 1 + + cpuid_feature_extract_field(read_system_reg(SYS_ID_AA64DFR0_EL1), + ID_AA64DFR0_BRPS_SHIFT); } /* Determine number of WRP registers available. */ static inline int get_num_wrps(void) { - return ((read_cpuid(ID_AA64DFR0_EL1) >> 20) & 0xf) + 1; + return 1 + + cpuid_feature_extract_field(read_system_reg(SYS_ID_AA64DFR0_EL1), + ID_AA64DFR0_WRPS_SHIFT); } #endif /* __KERNEL__ */ |