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>
68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2025 MIPS.
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*/
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#include <linux/memory.h>
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#include <linux/module.h>
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#include <asm/text-patching.h>
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#include <asm/alternative.h>
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#include <asm/errata_list.h>
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#include <asm/vendorid_list.h>
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#include <asm/vendor_extensions.h>
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#include <asm/vendor_extensions/mips.h>
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static inline bool errata_probe_pause(void)
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{
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if (!IS_ENABLED(CONFIG_ERRATA_MIPS_P8700_PAUSE_OPCODE))
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return false;
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if (!riscv_isa_vendor_extension_available(MIPS_VENDOR_ID, XMIPSEXECTL))
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return false;
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return true;
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}
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static u32 mips_errata_probe(void)
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{
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u32 cpu_req_errata = 0;
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if (errata_probe_pause())
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cpu_req_errata |= BIT(ERRATA_MIPS_P8700_PAUSE_OPCODE);
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return cpu_req_errata;
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}
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void mips_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
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unsigned long archid, unsigned long impid,
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unsigned int stage)
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{
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struct alt_entry *alt;
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u32 cpu_req_errata = mips_errata_probe();
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u32 tmp;
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BUILD_BUG_ON(ERRATA_MIPS_NUMBER >= RISCV_VENDOR_EXT_ALTERNATIVES_BASE);
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if (stage == RISCV_ALTERNATIVES_EARLY_BOOT)
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return;
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for (alt = begin; alt < end; alt++) {
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if (alt->vendor_id != MIPS_VENDOR_ID)
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continue;
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if (alt->patch_id >= ERRATA_MIPS_NUMBER) {
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WARN(1, "MIPS errata id:%d not in kernel errata list\n",
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alt->patch_id);
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continue;
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}
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tmp = (1U << alt->patch_id);
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if (cpu_req_errata && tmp) {
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mutex_lock(&text_mutex);
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patch_text_nosync(ALT_OLD_PTR(alt), ALT_ALT_PTR(alt),
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alt->alt_len);
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mutex_unlock(&text_mutex);
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}
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}
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}
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