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| author | Will Deacon <will.deacon@arm.com> | 2018-12-10 17:21:13 +0300 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-12-10 21:42:18 +0300 |
| commit | 66f16a24512fa44680504effe908df8326885594 (patch) | |
| tree | 9f56153b17ba2f9d443052654a8919f3c68009fb /arch/arm64/kernel/head.S | |
| parent | 68d23da4373aba76f5300017c4746440f276698e (diff) | |
| download | linux-66f16a24512fa44680504effe908df8326885594.tar.xz | |
arm64: smp: Rework early feature mismatched detection
Rather than add additional variables to detect specific early feature
mismatches with secondary CPUs, we can instead dedicate the upper bits
of the CPU boot status word to flag specific mismatches.
This allows us to communicate both granule and VA-size mismatches back
to the primary CPU without the need for additional book-keeping.
Tested-by: Steve Capper <steve.capper@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel/head.S')
| -rw-r--r-- | arch/arm64/kernel/head.S | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index 6b70dd625f01..eaa68ce6a06d 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -809,13 +809,8 @@ ENTRY(__cpu_secondary_check52bitva) and x0, x0, #(0xf << ID_AA64MMFR2_LVA_SHIFT) cbnz x0, 2f - adr_l x0, va52mismatch - mov w1, #1 - strb w1, [x0] - dmb sy - dc ivac, x0 // Invalidate potentially stale cache line - - update_early_cpu_boot_status CPU_STUCK_IN_KERNEL, x0, x1 + update_early_cpu_boot_status \ + CPU_STUCK_IN_KERNEL | CPU_STUCK_REASON_52_BIT_VA, x0, x1 1: wfe wfi b 1b @@ -826,7 +821,8 @@ ENDPROC(__cpu_secondary_check52bitva) __no_granule_support: /* Indicate that this CPU can't boot and is stuck in the kernel */ - update_early_cpu_boot_status CPU_STUCK_IN_KERNEL, x1, x2 + update_early_cpu_boot_status \ + CPU_STUCK_IN_KERNEL | CPU_STUCK_REASON_NO_GRAN, x1, x2 1: wfe wfi |