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88 lines
2.1 KiB
88 lines
2.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2021 Heiko Stuebner <[email protected]> |
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*/ |
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#include <linux/bug.h> |
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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/uaccess.h> |
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#include <asm/alternative.h> |
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#include <asm/cacheflush.h> |
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#include <asm/errata_list.h> |
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#include <asm/patch.h> |
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#include <asm/vendorid_list.h> |
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static bool errata_probe_pbmt(unsigned int stage, |
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unsigned long arch_id, unsigned long impid) |
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{ |
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if (arch_id != 0 || impid != 0) |
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return false; |
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if (stage == RISCV_ALTERNATIVES_EARLY_BOOT || |
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stage == RISCV_ALTERNATIVES_MODULE) |
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return true; |
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return false; |
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} |
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static bool errata_probe_cmo(unsigned int stage, |
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unsigned long arch_id, unsigned long impid) |
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{ |
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#ifdef CONFIG_ERRATA_THEAD_CMO |
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if (arch_id != 0 || impid != 0) |
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return false; |
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if (stage == RISCV_ALTERNATIVES_EARLY_BOOT) |
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return false; |
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riscv_noncoherent_supported(); |
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return true; |
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#else |
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return false; |
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#endif |
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} |
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static u32 thead_errata_probe(unsigned int stage, |
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unsigned long archid, unsigned long impid) |
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{ |
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u32 cpu_req_errata = 0; |
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if (errata_probe_pbmt(stage, archid, impid)) |
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cpu_req_errata |= (1U << ERRATA_THEAD_PBMT); |
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if (errata_probe_cmo(stage, archid, impid)) |
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cpu_req_errata |= (1U << ERRATA_THEAD_CMO); |
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return cpu_req_errata; |
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} |
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void __init_or_module thead_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 = thead_errata_probe(stage, archid, impid); |
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u32 tmp; |
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for (alt = begin; alt < end; alt++) { |
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if (alt->vendor_id != THEAD_VENDOR_ID) |
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continue; |
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if (alt->errata_id >= ERRATA_THEAD_NUMBER) |
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continue; |
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tmp = (1U << alt->errata_id); |
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if (cpu_req_errata & tmp) { |
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/* On vm-alternatives, the mmu isn't running yet */ |
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if (stage == RISCV_ALTERNATIVES_EARLY_BOOT) |
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memcpy((void *)__pa_symbol(alt->old_ptr), |
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(void *)__pa_symbol(alt->alt_ptr), alt->alt_len); |
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else |
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patch_text_nosync(alt->old_ptr, alt->alt_ptr, alt->alt_len); |
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} |
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} |
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if (stage == RISCV_ALTERNATIVES_EARLY_BOOT) |
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local_flush_icache_all(); |
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}
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