mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 17:16:41 +07:00
dce80a5626
Analogous to ACPI's /sys/firmware/acpi/tables/... create /sys/firmware/sfi/tables/ The tables are primariy for the kernel, but sometimes it is useful for user-space to be able to read them. Signed-off-by: Feng Tang <feng.tang@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
217 lines
6.1 KiB
C
217 lines
6.1 KiB
C
/* sfi_acpi.c Simple Firmware Interface - ACPI extensions */
|
|
|
|
/*
|
|
|
|
This file is provided under a dual BSD/GPLv2 license. When using or
|
|
redistributing this file, you may do so under either license.
|
|
|
|
GPL LICENSE SUMMARY
|
|
|
|
Copyright(c) 2009 Intel Corporation. All rights reserved.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of version 2 of the GNU General Public License as
|
|
published by the Free Software Foundation.
|
|
|
|
This program is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
|
|
The full GNU General Public License is included in this distribution
|
|
in the file called LICENSE.GPL.
|
|
|
|
BSD LICENSE
|
|
|
|
Copyright(c) 2009 Intel Corporation. All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* 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.
|
|
* Neither the name of Intel Corporation nor the names of its
|
|
contributors may be used to endorse or promote products derived
|
|
from this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
|
|
OWNER 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.
|
|
|
|
*/
|
|
|
|
#define KMSG_COMPONENT "SFI"
|
|
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <acpi/acpi.h>
|
|
|
|
#include <linux/sfi.h>
|
|
#include "sfi_core.h"
|
|
|
|
/*
|
|
* SFI can access ACPI-defined tables via an optional ACPI XSDT.
|
|
*
|
|
* This allows re-use, and avoids re-definition, of standard tables.
|
|
* For example, the "MCFG" table is defined by PCI, reserved by ACPI,
|
|
* and is expected to be present many SFI-only systems.
|
|
*/
|
|
|
|
static struct acpi_table_xsdt *xsdt_va __read_mostly;
|
|
|
|
#define XSDT_GET_NUM_ENTRIES(ptable, entry_type) \
|
|
((ptable->header.length - sizeof(struct acpi_table_header)) / \
|
|
(sizeof(entry_type)))
|
|
|
|
static inline struct sfi_table_header *acpi_to_sfi_th(
|
|
struct acpi_table_header *th)
|
|
{
|
|
return (struct sfi_table_header *)th;
|
|
}
|
|
|
|
static inline struct acpi_table_header *sfi_to_acpi_th(
|
|
struct sfi_table_header *th)
|
|
{
|
|
return (struct acpi_table_header *)th;
|
|
}
|
|
|
|
/*
|
|
* sfi_acpi_parse_xsdt()
|
|
*
|
|
* Parse the ACPI XSDT for later access by sfi_acpi_table_parse().
|
|
*/
|
|
static int __init sfi_acpi_parse_xsdt(struct sfi_table_header *th)
|
|
{
|
|
struct sfi_table_key key = SFI_ANY_KEY;
|
|
int tbl_cnt, i;
|
|
void *ret;
|
|
|
|
xsdt_va = (struct acpi_table_xsdt *)th;
|
|
tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64);
|
|
for (i = 0; i < tbl_cnt; i++) {
|
|
ret = sfi_check_table(xsdt_va->table_offset_entry[i], &key);
|
|
if (IS_ERR(ret)) {
|
|
disable_sfi();
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __init sfi_acpi_init(void)
|
|
{
|
|
struct sfi_table_key xsdt_key = { .sig = SFI_SIG_XSDT };
|
|
|
|
sfi_table_parse(SFI_SIG_XSDT, NULL, NULL, sfi_acpi_parse_xsdt);
|
|
|
|
/* Only call the get_table to keep the table mapped */
|
|
xsdt_va = (struct acpi_table_xsdt *)sfi_get_table(&xsdt_key);
|
|
return 0;
|
|
}
|
|
|
|
static struct acpi_table_header *sfi_acpi_get_table(struct sfi_table_key *key)
|
|
{
|
|
u32 tbl_cnt, i;
|
|
void *ret;
|
|
|
|
tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64);
|
|
for (i = 0; i < tbl_cnt; i++) {
|
|
ret = sfi_check_table(xsdt_va->table_offset_entry[i], key);
|
|
if (!IS_ERR(ret) && ret)
|
|
return sfi_to_acpi_th(ret);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void sfi_acpi_put_table(struct acpi_table_header *table)
|
|
{
|
|
sfi_put_table(acpi_to_sfi_th(table));
|
|
}
|
|
|
|
/*
|
|
* sfi_acpi_table_parse()
|
|
*
|
|
* Find specified table in XSDT, run handler on it and return its return value
|
|
*/
|
|
int sfi_acpi_table_parse(char *signature, char *oem_id, char *oem_table_id,
|
|
int(*handler)(struct acpi_table_header *))
|
|
{
|
|
struct acpi_table_header *table = NULL;
|
|
struct sfi_table_key key;
|
|
int ret = 0;
|
|
|
|
if (sfi_disabled)
|
|
return -1;
|
|
|
|
key.sig = signature;
|
|
key.oem_id = oem_id;
|
|
key.oem_table_id = oem_table_id;
|
|
|
|
table = sfi_acpi_get_table(&key);
|
|
if (!table)
|
|
return -EINVAL;
|
|
|
|
ret = handler(table);
|
|
sfi_acpi_put_table(table);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t sfi_acpi_table_show(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *bin_attr, char *buf,
|
|
loff_t offset, size_t count)
|
|
{
|
|
struct sfi_table_attr *tbl_attr =
|
|
container_of(bin_attr, struct sfi_table_attr, attr);
|
|
struct acpi_table_header *th = NULL;
|
|
struct sfi_table_key key;
|
|
ssize_t cnt;
|
|
|
|
key.sig = tbl_attr->name;
|
|
key.oem_id = NULL;
|
|
key.oem_table_id = NULL;
|
|
|
|
th = sfi_acpi_get_table(&key);
|
|
if (!th)
|
|
return 0;
|
|
|
|
cnt = memory_read_from_buffer(buf, count, &offset,
|
|
th, th->length);
|
|
sfi_acpi_put_table(th);
|
|
|
|
return cnt;
|
|
}
|
|
|
|
|
|
void __init sfi_acpi_sysfs_init(void)
|
|
{
|
|
u32 tbl_cnt, i;
|
|
struct sfi_table_attr *tbl_attr;
|
|
|
|
tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64);
|
|
for (i = 0; i < tbl_cnt; i++) {
|
|
tbl_attr =
|
|
sfi_sysfs_install_table(xsdt_va->table_offset_entry[i]);
|
|
tbl_attr->attr.read = sfi_acpi_table_show;
|
|
}
|
|
|
|
return;
|
|
}
|