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UPSTREAM: arm64/sme: Implement sysctl to set the default vector length

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As for SVE provide a sysctl which allows the default SME vector length to
be configured.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220419112247.711548-11-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
(cherry picked from commit 12f1bacfc5)
Signed-off-by: Will Deacon <willdeacon@google.com>
Bug: 233587962
Bug: 233588291
Change-Id: I96f40351e244d3e9d653ba9133f2c2324bb556f2
This commit is contained in:
Mark Brown
2022-04-19 12:22:18 +01:00
committed by Will Deacon
parent 9abea54712
commit 0bb489959e
1 changed files with 28 additions and 1 deletions
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29
arch/arm64/kernel/fpsimd.c
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@@ -489,6 +489,30 @@ static int __init sve_sysctl_init(void)
static int __init sve_sysctl_init(void) { return 0; }
#endif /* ! (CONFIG_ARM64_SVE && CONFIG_SYSCTL) */
#if defined(CONFIG_ARM64_SME) && defined(CONFIG_SYSCTL)
static struct ctl_table sme_default_vl_table[] = {
{
.procname = "sme_default_vector_length",
.mode = 0644,
.proc_handler = vec_proc_do_default_vl,
.extra1 = &vl_info[ARM64_VEC_SME],
},
{ }
};
static int __init sme_sysctl_init(void)
{
if (system_supports_sme())
if (!register_sysctl("abi", sme_default_vl_table))
return -EINVAL;
return 0;
}
#else /* ! (CONFIG_ARM64_SME && CONFIG_SYSCTL) */
static int __init sme_sysctl_init(void) { return 0; }
#endif /* ! (CONFIG_ARM64_SME && CONFIG_SYSCTL) */
#define ZREG(sve_state, vq, n) ((char *)(sve_state) + \
(SVE_SIG_ZREG_OFFSET(vq, n) - SVE_SIG_REGS_OFFSET))
@@ -1684,6 +1708,9 @@ static int __init fpsimd_init(void)
if (cpu_have_named_feature(SME) && !cpu_have_named_feature(SVE))
pr_notice("SME is implemented but not SVE\n");
return sve_sysctl_init();
sve_sysctl_init();
sme_sysctl_init();
return 0;
}
core_initcall(fpsimd_init);