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ARM: virt: Add boot-time diagnostics

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In order to easily detect pathological cases, print some diagnostics
when the kernel boots.

This also provides helpers to detect that HYP mode is actually available,
which can be used by other subsystems to enable HYP specific features.

Signed-off-by: Dave Martin <dave.martin@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Dave Martin 2012-02-17 16:54:28 +00:00 committed by Marc Zyngier
parent 6a6d55c38c
commit 4588c34daa
3 changed files with 40 additions and 0 deletions
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17
arch/arm/include/asm/virt.h
View File

@ -47,6 +47,23 @@ unsigned long __hyp_get_vectors(void);
#define __boot_cpu_mode (SVC_MODE)
#endif
#ifndef ZIMAGE
void hyp_mode_check(void);
/* Reports the availability of HYP mode */
static inline bool is_hyp_mode_available(void)
{
return ((__boot_cpu_mode & MODE_MASK) == HYP_MODE &&
!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH));
}
/* Check if the bootloader has booted CPUs in different modes */
static inline bool is_hyp_mode_mismatched(void)
{
return !!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH);
}
#endif
#endif /* __ASSEMBLY__ */
#endif /* ! VIRT_H */

20
arch/arm/kernel/setup.c
View File

@ -55,6 +55,7 @@
#include <asm/traps.h>
#include <asm/unwind.h>
#include <asm/memblock.h>
#include <asm/virt.h>
#if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
#include "compat.h"
@ -937,6 +938,21 @@ static int __init meminfo_cmp(const void *_a, const void *_b)
return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
}
void __init hyp_mode_check(void)
{
#ifdef CONFIG_ARM_VIRT_EXT
if (is_hyp_mode_available()) {
pr_info("CPU: All CPU(s) started in HYP mode.\n");
pr_info("CPU: Virtualization extensions available.\n");
} else if (is_hyp_mode_mismatched()) {
pr_warn("CPU: WARNING: CPU(s) started in wrong/inconsistent modes (primary CPU mode 0x%x)\n",
__boot_cpu_mode & MODE_MASK);
pr_warn("CPU: This may indicate a broken bootloader or firmware.\n");
} else
pr_info("CPU: All CPU(s) started in SVC mode.\n");
#endif
}
void __init setup_arch(char **cmdline_p)
{
struct machine_desc *mdesc;
@ -980,6 +996,10 @@ void __init setup_arch(char **cmdline_p)
if (is_smp())
smp_init_cpus();
#endif
if (!is_smp())
hyp_mode_check();
reserve_crashkernel();
tcm_init();

3
arch/arm/kernel/smp.c
View File

@ -42,6 +42,7 @@
#include <asm/ptrace.h>
#include <asm/localtimer.h>
#include <asm/smp_plat.h>
#include <asm/virt.h>
/*
* as from 2.5, kernels no longer have an init_tasks structure
@ -287,6 +288,8 @@ void __init smp_cpus_done(unsigned int max_cpus)
num_online_cpus(),
bogosum / (500000/HZ),
(bogosum / (5000/HZ)) % 100);
hyp_mode_check();
}
void __init smp_prepare_boot_cpu(void)