diff options
| author | Suzuki K. Poulose <suzuki.poulose@arm.com> | 2015-10-19 15:24:54 +0200 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2015-10-21 16:35:59 +0200 |
| commit | 3085bb01b40676d946a13064483ab2819ae3b010 (patch) | |
| tree | 89c04738eea71181db2fd293e6fd1afb5582eeba /arch/arm64 | |
| parent | arm64: Move FP/ASIMD hwcap handling to common code (diff) | |
| download | linux-3085bb01b40676d946a13064483ab2819ae3b010.tar.xz 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')
| -rw-r--r-- | arch/arm64/include/asm/hw_breakpoint.h | 9 | ||||
| -rw-r--r-- | arch/arm64/kernel/debug-monitors.c | 6 |
2 files changed, 11 insertions, 4 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__ */ diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c index 8eef30f92651..1429044b143c 100644 --- a/arch/arm64/kernel/debug-monitors.c +++ b/arch/arm64/kernel/debug-monitors.c @@ -26,14 +26,16 @@ #include <linux/stat.h> #include <linux/uaccess.h> -#include <asm/debug-monitors.h> +#include <asm/cpufeature.h> #include <asm/cputype.h> +#include <asm/debug-monitors.h> #include <asm/system_misc.h> /* Determine debug architecture. */ u8 debug_monitors_arch(void) { - return read_cpuid(ID_AA64DFR0_EL1) & 0xf; + return cpuid_feature_extract_field(read_system_reg(SYS_ID_AA64DFR0_EL1), + ID_AA64DFR0_DEBUGVER_SHIFT); } /* |