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

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[ Upstream commit fcd3d2c082 ]

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>
Stable-dep-of: 01948b09ed ("arm64/fpsimd: Only provide the length to cpufeature for xCR registers")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mark Brown
2022-12-27 13:04:35 +00:00
committed by Greg Kroah-Hartman
parent 1d9a735d4e
commit 8efd042029
1 changed files with 1 additions and 4 deletions
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5
arch/arm64/kernel/fpsimd.c
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@@ -1296,7 +1296,6 @@ u64 read_smcr_features(void)
unsigned int vq_max; unsigned int vq_max;
sme_kernel_enable(NULL); sme_kernel_enable(NULL);
sme_smstart_sm();
/* /*
* Set the maximum possible VL. * Set the maximum possible VL.
@@ -1306,11 +1305,9 @@ u64 read_smcr_features(void)
smcr = read_sysreg_s(SYS_SMCR_EL1); smcr = read_sysreg_s(SYS_SMCR_EL1);
smcr &= ~(u64)SMCR_ELx_LEN_MASK; /* Only the LEN field */ 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 */ smcr |= vq_max - 1; /* set LEN field to maximum effective value */
sme_smstop_sm();
return smcr; return smcr;
} }