Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2024 ARM Limited
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*
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* Common helper functions for SVE and SME functionality.
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*/
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#include <stdbool.h>
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#include <kselftest.h>
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#include <asm/sigcontext.h>
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#include <sys/prctl.h>
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unsigned int vls[SVE_VQ_MAX];
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unsigned int nvls;
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int sve_fill_vls(bool use_sme, int min_vls)
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{
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int vq, vl;
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int pr_set_vl = use_sme ? PR_SME_SET_VL : PR_SVE_SET_VL;
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int len_mask = use_sme ? PR_SME_VL_LEN_MASK : PR_SVE_VL_LEN_MASK;
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/*
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* Enumerate up to SVE_VQ_MAX vector lengths
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*/
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for (vq = SVE_VQ_MAX; vq > 0; --vq) {
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vl = prctl(pr_set_vl, vq * 16);
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if (vl == -1)
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return KSFT_FAIL;
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vl &= len_mask;
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/*
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* Unlike SVE, SME does not require the minimum vector length
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* to be implemented, or the VLs to be consecutive, so any call
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* to the prctl might return the single implemented VL, which
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* might be larger than 16. So to avoid this loop never
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* terminating, bail out here when we find a higher VL than
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* we asked for.
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* See the ARM ARM, DDI 0487K.a, B1.4.2: I_QQRNR and I_NWYBP.
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*/
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if (vq < sve_vq_from_vl(vl))
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break;
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/* Skip missing VLs */
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vq = sve_vq_from_vl(vl);
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vls[nvls++] = vl;
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}
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if (nvls < min_vls) {
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fprintf(stderr, "Only %d VL supported\n", nvls);
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return KSFT_SKIP;
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}
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return KSFT_PASS;
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}
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