[linux-block.git] / arch / riscv / errata / sifive / errata.c

// 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_unlock(&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);
}
Commit	Line	Data
1a0e5dbd VC	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/*
	3	* Copyright (C) 2021 Sifive.
	4	*/
	5
	6	#include <linux/kernel.h>
9493e6f3	7	#include <linux/memory.h>
a8e91016	8	#include <linux/module.h>
1a0e5dbd VC	9	#include <linux/string.h>
	10	#include <linux/bug.h>
	11	#include <asm/patch.h>
	12	#include <asm/alternative.h>
	13	#include <asm/vendorid_list.h>
	14	#include <asm/errata_list.h>
	15
	16	struct errata_info_t {
	17	char name[ERRATA_STRING_LENGTH_MAX];
	18	bool (*check_func)(unsigned long arch_id, unsigned long impid);
	19	};
	20
800149a7 VC	21	static bool errata_cip_453_check_func(unsigned long arch_id, unsigned long impid)
	22	{
	23	/*
	24	* Affected cores:
	25	* Architecture ID: 0x8000000000000007
	26	* Implement ID: 0x20181004 <= impid <= 0x20191105
	27	*/
	28	if (arch_id != 0x8000000000000007 \|\|
	29	(impid < 0x20181004 \|\| impid > 0x20191105))
	30	return false;
	31	return true;
	32	}
	33
bff3ff52 VC	34	static bool errata_cip_1200_check_func(unsigned long arch_id, unsigned long impid)
	35	{
	36	/*
	37	* Affected cores:
	38	* Architecture ID: 0x8000000000000007 or 0x1
	39	* Implement ID: mimpid[23:0] <= 0x200630 and mimpid != 0x01200626
	40	*/
	41	if (arch_id != 0x8000000000000007 && arch_id != 0x1)
	42	return false;
	43	if ((impid & 0xffffff) > 0x200630 \|\| impid == 0x1200626)
	44	return false;
	45	return true;
	46	}
	47
800149a7 VC	48	static struct errata_info_t errata_list[ERRATA_SIFIVE_NUMBER] = {
	49	{
	50	.name = "cip-453",
	51	.check_func = errata_cip_453_check_func
	52	},
bff3ff52 VC	53	{
	54	.name = "cip-1200",
	55	.check_func = errata_cip_1200_check_func
	56	},
800149a7 VC	57	};
800149a7 VC	58
a8e91016 HS	59	static u32 __init_or_module sifive_errata_probe(unsigned long archid,
a8e91016 HS	60	unsigned long impid)
1a0e5dbd VC	61	{
	62	int idx;
	63	u32 cpu_req_errata = 0;
	64
	65	for (idx = 0; idx < ERRATA_SIFIVE_NUMBER; idx++)
	66	if (errata_list[idx].check_func(archid, impid))
	67	cpu_req_errata \|= (1U << idx);
	68
	69	return cpu_req_errata;
	70	}
	71
a8e91016	72	static void __init_or_module warn_miss_errata(u32 miss_errata)
1a0e5dbd VC	73	{
	74	int i;
	75
	76	pr_warn("----------------------------------------------------------------\n");
	77	pr_warn("WARNING: Missing the following errata may cause potential issues\n");
	78	for (i = 0; i < ERRATA_SIFIVE_NUMBER; i++)
	79	if (miss_errata & 0x1 << i)
	80	pr_warn("\tSiFive Errata[%d]:%s\n", i, errata_list[i].name);
	81	pr_warn("Please enable the corresponding Kconfig to apply them\n");
	82	pr_warn("----------------------------------------------------------------\n");
	83	}
	84
a8e91016 HS	85	void __init_or_module sifive_errata_patch_func(struct alt_entry *begin,
	86	struct alt_entry *end,
	87	unsigned long archid,
	88	unsigned long impid,
	89	unsigned int stage)
1a0e5dbd VC	90	{
1a0e5dbd VC	91	struct alt_entry *alt;
a35707c3	92	u32 cpu_req_errata;
1a0e5dbd VC	93	u32 cpu_apply_errata = 0;
	94	u32 tmp;
	95
a35707c3 HS	96	if (stage == RISCV_ALTERNATIVES_EARLY_BOOT)
	97	return;
	98
	99	cpu_req_errata = sifive_errata_probe(archid, impid);
	100
1a0e5dbd VC	101	for (alt = begin; alt < end; alt++) {
	102	if (alt->vendor_id != SIFIVE_VENDOR_ID)
	103	continue;
	104	if (alt->errata_id >= ERRATA_SIFIVE_NUMBER) {
	105	WARN(1, "This errata id:%d is not in kernel errata list", alt->errata_id);
	106	continue;
	107	}
	108
	109	tmp = (1U << alt->errata_id);
	110	if (cpu_req_errata & tmp) {
9493e6f3	111	mutex_lock(&text_mutex);
8d23e94a JZ	112	patch_text_nosync(ALT_OLD_PTR(alt), ALT_ALT_PTR(alt),
8d23e94a JZ	113	alt->alt_len);
bf89b7ee	114	mutex_unlock(&text_mutex);
1a0e5dbd VC	115	cpu_apply_errata \|= tmp;
	116	}
	117	}
dc5cb7a8 HS	118	if (stage != RISCV_ALTERNATIVES_MODULE &&
dc5cb7a8 HS	119	cpu_apply_errata != cpu_req_errata)
1a0e5dbd VC	120	warn_miss_errata(cpu_req_errata - cpu_apply_errata);
1a0e5dbd VC	121	}