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28a12ef366
When both the SiFive and MIPS errata are enabled then sifive_errata_patch_func emits a wrong and misleading warning claiming that the SiFive errata haven't been applied. This happens because sifive_errata_patch_func is being called twice, once for the kernel image and once for the vdso image. The vdso image has alternative entries for the MIPS errata, but none for the SiFive errata. Signed-off-by: Andreas Schwab <schwab@suse.de> Link: https://patch.msgid.link/mvmv7i8q8gg.fsf@suse.de Signed-off-by: Paul Walmsley <pjw@kernel.org>
110 lines
2.5 KiB
C
110 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2021 Sifive.
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*/
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#include <linux/kernel.h>
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#include <linux/memory.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/bug.h>
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#include <asm/text-patching.h>
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#include <asm/alternative.h>
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#include <asm/vendorid_list.h>
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#include <asm/errata_list.h>
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#include <asm/vendor_extensions.h>
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struct errata_info_t {
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char name[32];
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bool (*check_func)(unsigned long arch_id, unsigned long impid);
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};
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static bool errata_cip_453_check_func(unsigned long arch_id, unsigned long impid)
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{
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/*
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* Affected cores:
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* Architecture ID: 0x8000000000000007
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* Implement ID: 0x20181004 <= impid <= 0x20191105
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*/
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if (arch_id != 0x8000000000000007 ||
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(impid < 0x20181004 || impid > 0x20191105))
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return false;
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return true;
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}
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static bool errata_cip_1200_check_func(unsigned long arch_id, unsigned long impid)
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{
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/*
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* Affected cores:
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* Architecture ID: 0x8000000000000007 or 0x1
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* Implement ID: mimpid[23:0] <= 0x200630 and mimpid != 0x01200626
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*/
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if (arch_id != 0x8000000000000007 && arch_id != 0x1)
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return false;
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if ((impid & 0xffffff) > 0x200630 || impid == 0x1200626)
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return false;
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#ifdef CONFIG_MMU
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tlb_flush_all_threshold = 0;
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#endif
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return true;
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}
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static struct errata_info_t errata_list[ERRATA_SIFIVE_NUMBER] = {
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{
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.name = "cip-453",
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.check_func = errata_cip_453_check_func
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},
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{
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.name = "cip-1200",
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.check_func = errata_cip_1200_check_func
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},
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};
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static u32 __init_or_module sifive_errata_probe(unsigned long archid,
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unsigned long impid)
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{
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int idx;
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u32 cpu_req_errata = 0;
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for (idx = 0; idx < ERRATA_SIFIVE_NUMBER; idx++)
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if (errata_list[idx].check_func(archid, impid))
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cpu_req_errata |= (1U << idx);
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return cpu_req_errata;
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}
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void sifive_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;
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u32 tmp;
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BUILD_BUG_ON(ERRATA_SIFIVE_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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cpu_req_errata = sifive_errata_probe(archid, impid);
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for (alt = begin; alt < end; alt++) {
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if (alt->vendor_id != SIFIVE_VENDOR_ID)
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continue;
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if (alt->patch_id >= ERRATA_SIFIVE_NUMBER) {
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WARN(1, "This errata id:%d is not in kernel errata list", 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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