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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2021 Sifive.
*/
#include <linux/kernel.h>
#include <linux/memory.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/bug.h>
#include <asm/patch.h>
#include <asm/alternative.h>
#include <asm/vendorid_list.h>
#include <asm/errata_list.h>
struct errata_info_t {
char name[ERRATA_STRING_LENGTH_MAX];
bool (*check_func)(unsigned long arch_id, unsigned long impid);
};
static bool errata_cip_453_check_func(unsigned long arch_id, unsigned long impid)
{
/*
* Affected cores:
* Architecture ID: 0x8000000000000007
* Implement ID: 0x20181004 <= impid <= 0x20191105
*/
if (arch_id != 0x8000000000000007 ||
(impid < 0x20181004 || impid > 0x20191105))
return false;
return true;
}
static bool errata_cip_1200_check_func(unsigned long arch_id, unsigned long impid)
{
/*
* Affected cores:
* Architecture ID: 0x8000000000000007 or 0x1
* Implement ID: mimpid[23:0] <= 0x200630 and mimpid != 0x01200626
*/
if (arch_id != 0x8000000000000007 && arch_id != 0x1)
return false;
if ((impid & 0xffffff) > 0x200630 || impid == 0x1200626)
return false;
return true;
}
static struct errata_info_t errata_list[ERRATA_SIFIVE_NUMBER] = {
{
.name = "cip-453",
.check_func = errata_cip_453_check_func
},
{
.name = "cip-1200",
.check_func = errata_cip_1200_check_func
},
};
static u32 __init_or_module sifive_errata_probe(unsigned long archid,
unsigned long impid)
{
int idx;
u32 cpu_req_errata = 0;
for (idx = 0; idx < ERRATA_SIFIVE_NUMBER; idx++)
if (errata_list[idx].check_func(archid, impid))
cpu_req_errata |= (1U << idx);
return cpu_req_errata;
}
static void __init_or_module warn_miss_errata(u32 miss_errata)
{
int i;
pr_warn("----------------------------------------------------------------\n");
pr_warn("WARNING: Missing the following errata may cause potential issues\n");
for (i = 0; i < ERRATA_SIFIVE_NUMBER; i++)
if (miss_errata & 0x1 << i)
pr_warn("\tSiFive Errata[%d]:%s\n", i, errata_list[i].name);
pr_warn("Please enable the corresponding Kconfig to apply them\n");
pr_warn("----------------------------------------------------------------\n");
}
void __init_or_module sifive_errata_patch_func(struct alt_entry *begin,
struct alt_entry *end,
unsigned long archid,
unsigned long impid,
unsigned int stage)
{
struct alt_entry *alt;
u32 cpu_req_errata;
u32 cpu_apply_errata = 0;
u32 tmp;
if (stage == RISCV_ALTERNATIVES_EARLY_BOOT)
return;
cpu_req_errata = sifive_errata_probe(archid, impid);
for (alt = begin; alt < end; alt++) {
if (alt->vendor_id != SIFIVE_VENDOR_ID)
continue;
if (alt->errata_id >= ERRATA_SIFIVE_NUMBER) {
WARN(1, "This errata id:%d is not in kernel errata list", alt->errata_id);
continue;
}
tmp = (1U << alt->errata_id);
if (cpu_req_errata & tmp) {
mutex_lock(&text_mutex);
patch_text_nosync(ALT_OLD_PTR(alt), ALT_ALT_PTR(alt),
alt->alt_len);
mutex_lock(&text_mutex);
cpu_apply_errata |= tmp;
}
}
if (stage != RISCV_ALTERNATIVES_MODULE &&
cpu_apply_errata != cpu_req_errata)
warn_miss_errata(cpu_req_errata - cpu_apply_errata);
}
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