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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2024 Arm Ltd
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _MACHINE_CPU_FEAT_H_
#define _MACHINE_CPU_FEAT_H_
#include <sys/linker_set.h>
#include <sys/sysctl.h>
typedef enum {
ERRATA_UNKNOWN, /* Unknown erratum */
ERRATA_NONE, /* No errata for this feature on this system. */
ERRATA_AFFECTED, /* There is errata on this system. */
ERRATA_FW_MITIGAION, /* There is errata, and a firmware */
/* mitigation. The mitigation may need a */
/* kernel component. */
} cpu_feat_errata;
typedef enum {
/*
* Don't implement the feature or erratum wrokarount,
* e.g. the feature is not implemented or erratum is
* for another CPU.
*/
FEAT_ALWAYS_DISABLE,
/*
* Disable by default, but allow the user to enable,
* e.g. For a rare erratum with a workaround, Arm
* Category B (rare) or similar.
*/
FEAT_DEFAULT_DISABLE,
/*
* Enabled by default, bit allow the user to disable,
* e.g. For a common erratum with a workaround, Arm
* Category A or B or similar.
*/
FEAT_DEFAULT_ENABLE,
/* We could add FEAT_ALWAYS_ENABLE if a need was found. */
} cpu_feat_en;
#define CPU_FEAT_STAGE_MASK 0x00000001
#define CPU_FEAT_EARLY_BOOT 0x00000000
#define CPU_FEAT_AFTER_DEV 0x00000001
#define CPU_FEAT_SCOPE_MASK 0x00000010
#define CPU_FEAT_PER_CPU 0x00000000
#define CPU_FEAT_SYSTEM 0x00000010
#define CPU_FEAT_USER_ENABLED 0x40000000
#define CPU_FEAT_USER_DISABLED 0x80000000
struct cpu_feat;
typedef cpu_feat_en (cpu_feat_check)(const struct cpu_feat *, u_int);
typedef bool (cpu_feat_has_errata)(const struct cpu_feat *, u_int,
u_int **, u_int *);
typedef bool (cpu_feat_enable)(const struct cpu_feat *, cpu_feat_errata,
u_int *, u_int);
typedef void (cpu_feat_disabled)(const struct cpu_feat *);
struct cpu_feat {
const char *feat_name;
cpu_feat_check *feat_check;
cpu_feat_has_errata *feat_has_errata;
cpu_feat_enable *feat_enable;
cpu_feat_disabled *feat_disabled;
uint32_t feat_flags;
bool feat_enabled;
};
SET_DECLARE(cpu_feat_set, struct cpu_feat);
SYSCTL_DECL(_hw_feat);
#define CPU_FEAT(name, descr, check, has_errata, enable, disabled, flags) \
static struct cpu_feat name = { \
.feat_name = #name, \
.feat_check = check, \
.feat_has_errata = has_errata, \
.feat_enable = enable, \
.feat_disabled = disabled, \
.feat_flags = flags, \
.feat_enabled = false, \
}; \
DATA_SET(cpu_feat_set, name); \
SYSCTL_BOOL(_hw_feat, OID_AUTO, name, CTLFLAG_RD, &name.feat_enabled, \
0, descr)
/*
* Allow drivers to mark an erratum as worked around, e.g. the Errata
* Management ABI may know the workaround isn't needed on a given system.
*/
typedef cpu_feat_errata (*cpu_feat_errata_check_fn)(const struct cpu_feat *,
u_int);
void cpu_feat_register_errata_check(cpu_feat_errata_check_fn);
void enable_cpu_feat(uint32_t);
/* Check if an erratum is in the list of errata */
static inline bool
cpu_feat_has_erratum(u_int *errata_list, u_int errata_count, u_int erratum)
{
for (u_int i = 0; i < errata_count; i++)
if (errata_list[0] == erratum)
return (true);
return (false);
}
#endif /* _MACHINE_CPU_FEAT_H_ */
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