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arm64: log CPU boot modes 

We currently don't log the boot mode for arm64 as we do for arm, and
without KVM the user is provided with no indication as to which mode(s)
CPUs were booted in, which can seriously hinder debugging in some cases.

Add logging to the boot path once all CPUs are up. Where CPUs are
mismatched in violation of the boot protocol, WARN and set a taint (as
we do for CPU other CPU feature mismatches) given that the
firmware/bootloader is buggy and should be fixed.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Mark Rutland 2015-03-13 16:14:37 +00:00 committed by Will Deacon
parent 424a383824
commit 667f3fd395
1 changed files with 13 additions and 0 deletions
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13
arch/arm64/kernel/setup.c
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@ -62,6 +62,7 @@
#include <asm/memblock.h>
#include <asm/psci.h>
#include <asm/efi.h>
#include <asm/virt.h>
unsigned int processor_id;
EXPORT_SYMBOL(processor_id);
@ -207,8 +208,20 @@ static void __init smp_build_mpidr_hash(void)
}
#endif
static void __init hyp_mode_check(void)
{
if (is_hyp_mode_available())
pr_info("CPU: All CPU(s) started at EL2\n");
else if (is_hyp_mode_mismatched())
WARN_TAINT(1, TAINT_CPU_OUT_OF_SPEC,
"CPU: CPUs started in inconsistent modes");
else
pr_info("CPU: All CPU(s) started at EL1\n");
}
void __init do_post_cpus_up_work(void)
{
hyp_mode_check();
apply_alternatives_all();
}