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>
This commit is contained in:
Suzuki K. Poulose 2015-10-19 14:24:54 +01:00 коммит произвёл Catalin Marinas
Родитель fe80f9f2da
Коммит 3085bb01b4
2 изменённых файлов: 11 добавлений и 4 удалений
arch/arm64

Просмотреть файл

@ -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__ */

Просмотреть файл

@ -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);
}
/*