arm64/sme: Don't use streaming mode to probe the maximum SME VL

During development the architecture added the RDSVL instruction which means
we do not need to enter streaming mode to enumerate the SME VLs, use it
when we probe the maximum supported VL. Other users were already updated.

No functional change.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221223-arm64-sme-probe-max-v1-1-cbde68f67ad0@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
index dcc81e7200d4011c99a448f90853263d321a7e65..62c67664cdaa169b7978aaa766e60f5e401b7c68 100644 (file)
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -1322,7 +1322,6 @@ u64 read_smcr_features(void)
        unsigned int vq_max;
 
        sme_kernel_enable(NULL);
-       sme_smstart_sm();
 
        /*
         * Set the maximum possible VL.
@@ -1332,11 +1331,9 @@ u64 read_smcr_features(void)
 
        smcr = read_sysreg_s(SYS_SMCR_EL1);
        smcr &= ~(u64)SMCR_ELx_LEN_MASK; /* Only the LEN field */
-       vq_max = sve_vq_from_vl(sve_get_vl());
+       vq_max = sve_vq_from_vl(sme_get_vl());
        smcr |= vq_max - 1; /* set LEN field to maximum effective value */
 
-       sme_smstop_sm();
-
        return smcr;
 }