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117 lines
3.0 KiB
117 lines
3.0 KiB
// 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/module.h> |
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#include <linux/string.h> |
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#include <linux/bug.h> |
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#include <asm/patch.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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struct errata_info_t { |
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char name[ERRATA_STRING_LENGTH_MAX]; |
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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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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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static void __init_or_module warn_miss_errata(u32 miss_errata) |
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{ |
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int i; |
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pr_warn("----------------------------------------------------------------\n"); |
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pr_warn("WARNING: Missing the following errata may cause potential issues\n"); |
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for (i = 0; i < ERRATA_SIFIVE_NUMBER; i++) |
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if (miss_errata & 0x1 << i) |
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pr_warn("\tSiFive Errata[%d]:%s\n", i, errata_list[i].name); |
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pr_warn("Please enable the corresponding Kconfig to apply them\n"); |
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pr_warn("----------------------------------------------------------------\n"); |
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} |
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void __init_or_module sifive_errata_patch_func(struct alt_entry *begin, |
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struct alt_entry *end, |
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unsigned long archid, |
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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 cpu_apply_errata = 0; |
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u32 tmp; |
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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->errata_id >= ERRATA_SIFIVE_NUMBER) { |
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WARN(1, "This errata id:%d is not in kernel errata list", alt->errata_id); |
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continue; |
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} |
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tmp = (1U << alt->errata_id); |
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if (cpu_req_errata & tmp) { |
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patch_text_nosync(alt->old_ptr, alt->alt_ptr, alt->alt_len); |
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cpu_apply_errata |= tmp; |
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} |
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} |
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if (stage != RISCV_ALTERNATIVES_MODULE && |
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cpu_apply_errata != cpu_req_errata) |
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warn_miss_errata(cpu_req_errata - cpu_apply_errata); |
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}
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