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>
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2023 SiFive
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* Author: Andy Chiu <andy.chiu@sifive.com>
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*/
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#include <linux/linkage.h>
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#include <asm/asm.h>
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#include <asm/vector.h>
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#include <asm/simd.h>
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#ifdef CONFIG_MMU
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#include <asm/asm-prototypes.h>
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#endif
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#ifdef CONFIG_MMU
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size_t riscv_v_usercopy_threshold = CONFIG_RISCV_ISA_V_UCOPY_THRESHOLD;
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int __asm_vector_usercopy(void *dst, void *src, size_t n);
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int __asm_vector_usercopy_sum_enabled(void *dst, void *src, size_t n);
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int fallback_scalar_usercopy(void *dst, void *src, size_t n);
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int fallback_scalar_usercopy_sum_enabled(void *dst, void *src, size_t n);
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asmlinkage int enter_vector_usercopy(void *dst, void *src, size_t n,
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bool enable_sum)
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{
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size_t remain, copied;
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/* skip has_vector() check because it has been done by the asm */
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if (!may_use_simd())
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goto fallback;
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kernel_vector_begin();
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remain = enable_sum ? __asm_vector_usercopy(dst, src, n) :
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__asm_vector_usercopy_sum_enabled(dst, src, n);
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kernel_vector_end();
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if (remain) {
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copied = n - remain;
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dst += copied;
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src += copied;
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n = remain;
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goto fallback;
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}
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return remain;
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fallback:
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return enable_sum ? fallback_scalar_usercopy(dst, src, n) :
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fallback_scalar_usercopy_sum_enabled(dst, src, n);
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}
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#endif
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