From b42990d3bf77cc29d7c33e21518c1f806dae6b21 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Tue, 19 Apr 2022 12:22:17 +0100 Subject: arm64/sme: Identify supported SME vector lengths at boot The vector lengths used for SME are controlled through a similar set of registers to those for SVE and enumerated using a similar algorithm with some slight differences due to the fact that unlike SVE there are no restrictions on which combinations of vector lengths can be supported nor any mandatory vector lengths which must be implemented. Add a new vector type and implement support for enumerating it. One slightly awkward feature is that we need to read the current vector length using a different instruction (or enter streaming mode which would have the same issue and be higher cost). Rather than add an ops structure we add special cases directly in the otherwise generic vec_probe_vqs() function, this is a bit inelegant but it's the only place where this is an issue. Signed-off-by: Mark Brown Reviewed-by: Catalin Marinas Link: https://lore.kernel.org/r/20220419112247.711548-10-broonie@kernel.org Signed-off-by: Catalin Marinas --- arch/arm64/include/asm/cpu.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/arm64/include/asm/cpu.h') diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h index d08062bcb9c1..115cdec1ae87 100644 --- a/arch/arm64/include/asm/cpu.h +++ b/arch/arm64/include/asm/cpu.h @@ -64,6 +64,9 @@ struct cpuinfo_arm64 { /* pseudo-ZCR for recording maximum ZCR_EL1 LEN value: */ u64 reg_zcr; + + /* pseudo-SMCR for recording maximum SMCR_EL1 LEN value: */ + u64 reg_smcr; }; DECLARE_PER_CPU(struct cpuinfo_arm64, cpu_data); -- cgit