Commit 3085bb01 authored by Suzuki K. Poulose's avatar Suzuki K. Poulose Committed by Catalin Marinas

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: default avatarSuzuki K. Poulose <suzuki.poulose@arm.com>
Tested-by: default avatarDave Martin <Dave.Martin@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent fe80f9f2
......@@ -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__ */
......
......@@ -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);
}
/*
......
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