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arm64/debug: Make use of the system wide safe value

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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>
This commit is contained in:
Suzuki K. Poulose
2015-10-19 14:24:54 +01:00
committed by Catalin Marinas
parent fe80f9f2da
commit 3085bb01b4
2 changed files with 11 additions and 4 deletions
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9
arch/arm64/include/asm/hw_breakpoint.h
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@@ -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__ */