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arm64: Add cpu_panic_kernel helper

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During the activation of a secondary CPU, we could report serious
configuration issues and hence request to crash the kernel. We do
this for CPU ASID bit check now. We will need it also for handling
mismatched exception levels for the CPUs with VHE. Hence, add a
helper to do the same for reusability.

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Suzuki K Poulose 2016-04-12 15:46:00 +01:00 committed by Will Deacon
parent 6afedcd23c
commit 17eebd1a43
2 changed files with 12 additions and 2 deletions
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11
arch/arm64/include/asm/smp.h
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@ -113,6 +113,17 @@ static inline void update_cpu_boot_status(int val)
dsb(ishst); dsb(ishst);
} }
/*
* The calling secondary CPU has detected serious configuration mismatch,
* which calls for a kernel panic. Update the boot status and park the calling
* CPU.
*/
static inline void cpu_panic_kernel(void)
{
update_cpu_boot_status(CPU_PANIC_KERNEL);
cpu_park_loop();
}
#endif /* ifndef __ASSEMBLY__ */ #endif /* ifndef __ASSEMBLY__ */
#endif /* ifndef __ASM_SMP_H */ #endif /* ifndef __ASM_SMP_H */

3
arch/arm64/mm/context.c
View file

@ -75,8 +75,7 @@ void verify_cpu_asid_bits(void)
*/ */
pr_crit("CPU%d: smaller ASID size(%u) than boot CPU (%u)\n", pr_crit("CPU%d: smaller ASID size(%u) than boot CPU (%u)\n",
smp_processor_id(), asid, asid_bits); smp_processor_id(), asid, asid_bits);
update_cpu_boot_status(CPU_PANIC_KERNEL); cpu_panic_kernel();
cpu_park_loop();
} }
} }