1205 lines
29 KiB
C
1205 lines
29 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/ctype.h>
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#include <linux/dmi.h>
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#include <linux/efi.h>
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#include <linux/memblock.h>
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#include <linux/random.h>
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#include <asm/dmi.h>
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#include <asm/unaligned.h>
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#ifndef SMBIOS_ENTRY_POINT_SCAN_START
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#define SMBIOS_ENTRY_POINT_SCAN_START 0xF0000
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#endif
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struct kobject *dmi_kobj;
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EXPORT_SYMBOL_GPL(dmi_kobj);
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/*
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* DMI stands for "Desktop Management Interface". It is part
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* of and an antecedent to, SMBIOS, which stands for System
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* Management BIOS. See further: https://www.dmtf.org/standards
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*/
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static const char dmi_empty_string[] = "";
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static u32 dmi_ver __initdata;
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static u32 dmi_len;
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static u16 dmi_num;
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static u8 smbios_entry_point[32];
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static int smbios_entry_point_size;
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/* DMI system identification string used during boot */
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static char dmi_ids_string[128] __initdata;
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static struct dmi_memdev_info {
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const char *device;
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const char *bank;
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u64 size; /* bytes */
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u16 handle;
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u8 type; /* DDR2, DDR3, DDR4 etc */
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} *dmi_memdev;
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static int dmi_memdev_nr;
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static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
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{
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const u8 *bp = ((u8 *) dm) + dm->length;
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const u8 *nsp;
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if (s) {
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while (--s > 0 && *bp)
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bp += strlen(bp) + 1;
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/* Strings containing only spaces are considered empty */
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nsp = bp;
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while (*nsp == ' ')
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nsp++;
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if (*nsp != '\0')
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return bp;
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}
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return dmi_empty_string;
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}
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static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
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{
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const char *bp = dmi_string_nosave(dm, s);
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char *str;
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size_t len;
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if (bp == dmi_empty_string)
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return dmi_empty_string;
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len = strlen(bp) + 1;
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str = dmi_alloc(len);
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if (str != NULL)
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strcpy(str, bp);
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return str;
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}
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/*
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* We have to be cautious here. We have seen BIOSes with DMI pointers
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* pointing to completely the wrong place for example
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*/
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static void dmi_decode_table(u8 *buf,
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void (*decode)(const struct dmi_header *, void *),
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void *private_data)
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{
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u8 *data = buf;
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int i = 0;
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/*
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* Stop when we have seen all the items the table claimed to have
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* (SMBIOS < 3.0 only) OR we reach an end-of-table marker (SMBIOS
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* >= 3.0 only) OR we run off the end of the table (should never
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* happen but sometimes does on bogus implementations.)
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*/
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while ((!dmi_num || i < dmi_num) &&
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(data - buf + sizeof(struct dmi_header)) <= dmi_len) {
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const struct dmi_header *dm = (const struct dmi_header *)data;
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/*
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* We want to know the total length (formatted area and
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* strings) before decoding to make sure we won't run off the
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* table in dmi_decode or dmi_string
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*/
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data += dm->length;
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while ((data - buf < dmi_len - 1) && (data[0] || data[1]))
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data++;
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if (data - buf < dmi_len - 1)
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decode(dm, private_data);
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data += 2;
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i++;
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/*
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* 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
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* For tables behind a 64-bit entry point, we have no item
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* count and no exact table length, so stop on end-of-table
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* marker. For tables behind a 32-bit entry point, we have
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* seen OEM structures behind the end-of-table marker on
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* some systems, so don't trust it.
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*/
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if (!dmi_num && dm->type == DMI_ENTRY_END_OF_TABLE)
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break;
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}
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/* Trim DMI table length if needed */
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if (dmi_len > data - buf)
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dmi_len = data - buf;
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}
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static phys_addr_t dmi_base;
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static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
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void *))
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{
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u8 *buf;
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u32 orig_dmi_len = dmi_len;
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buf = dmi_early_remap(dmi_base, orig_dmi_len);
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if (buf == NULL)
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return -ENOMEM;
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dmi_decode_table(buf, decode, NULL);
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add_device_randomness(buf, dmi_len);
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dmi_early_unmap(buf, orig_dmi_len);
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return 0;
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}
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static int __init dmi_checksum(const u8 *buf, u8 len)
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{
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u8 sum = 0;
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int a;
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for (a = 0; a < len; a++)
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sum += buf[a];
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return sum == 0;
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}
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static const char *dmi_ident[DMI_STRING_MAX];
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static LIST_HEAD(dmi_devices);
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int dmi_available;
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EXPORT_SYMBOL_GPL(dmi_available);
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/*
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* Save a DMI string
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*/
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static void __init dmi_save_ident(const struct dmi_header *dm, int slot,
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int string)
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{
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const char *d = (const char *) dm;
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const char *p;
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if (dmi_ident[slot] || dm->length <= string)
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return;
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p = dmi_string(dm, d[string]);
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if (p == NULL)
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return;
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dmi_ident[slot] = p;
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}
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static void __init dmi_save_release(const struct dmi_header *dm, int slot,
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int index)
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{
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const u8 *minor, *major;
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char *s;
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/* If the table doesn't have the field, let's return */
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if (dmi_ident[slot] || dm->length < index)
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return;
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minor = (u8 *) dm + index;
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major = (u8 *) dm + index - 1;
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/* As per the spec, if the system doesn't support this field,
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* the value is FF
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*/
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if (*major == 0xFF && *minor == 0xFF)
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return;
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s = dmi_alloc(8);
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if (!s)
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return;
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sprintf(s, "%u.%u", *major, *minor);
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dmi_ident[slot] = s;
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}
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static void __init dmi_save_uuid(const struct dmi_header *dm, int slot,
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int index)
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{
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const u8 *d;
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char *s;
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int is_ff = 1, is_00 = 1, i;
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if (dmi_ident[slot] || dm->length < index + 16)
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return;
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d = (u8 *) dm + index;
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for (i = 0; i < 16 && (is_ff || is_00); i++) {
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if (d[i] != 0x00)
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is_00 = 0;
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if (d[i] != 0xFF)
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is_ff = 0;
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}
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if (is_ff || is_00)
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return;
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s = dmi_alloc(16*2+4+1);
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if (!s)
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return;
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/*
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* As of version 2.6 of the SMBIOS specification, the first 3 fields of
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* the UUID are supposed to be little-endian encoded. The specification
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* says that this is the defacto standard.
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*/
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if (dmi_ver >= 0x020600)
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sprintf(s, "%pUl", d);
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else
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sprintf(s, "%pUb", d);
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dmi_ident[slot] = s;
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}
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static void __init dmi_save_type(const struct dmi_header *dm, int slot,
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int index)
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{
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const u8 *d;
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char *s;
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if (dmi_ident[slot] || dm->length <= index)
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return;
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s = dmi_alloc(4);
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if (!s)
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return;
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d = (u8 *) dm + index;
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sprintf(s, "%u", *d & 0x7F);
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dmi_ident[slot] = s;
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}
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static void __init dmi_save_one_device(int type, const char *name)
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{
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struct dmi_device *dev;
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/* No duplicate device */
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if (dmi_find_device(type, name, NULL))
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return;
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dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
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if (!dev)
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return;
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dev->type = type;
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strcpy((char *)(dev + 1), name);
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dev->name = (char *)(dev + 1);
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dev->device_data = NULL;
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list_add(&dev->list, &dmi_devices);
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}
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static void __init dmi_save_devices(const struct dmi_header *dm)
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{
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int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
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for (i = 0; i < count; i++) {
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const char *d = (char *)(dm + 1) + (i * 2);
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/* Skip disabled device */
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if ((*d & 0x80) == 0)
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continue;
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dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
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}
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}
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static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
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{
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int i, count;
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struct dmi_device *dev;
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if (dm->length < 0x05)
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return;
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count = *(u8 *)(dm + 1);
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for (i = 1; i <= count; i++) {
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const char *devname = dmi_string(dm, i);
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if (devname == dmi_empty_string)
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continue;
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dev = dmi_alloc(sizeof(*dev));
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if (!dev)
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break;
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dev->type = DMI_DEV_TYPE_OEM_STRING;
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dev->name = devname;
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dev->device_data = NULL;
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list_add(&dev->list, &dmi_devices);
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}
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}
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static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
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{
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struct dmi_device *dev;
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void *data;
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data = dmi_alloc(dm->length);
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if (data == NULL)
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return;
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memcpy(data, dm, dm->length);
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dev = dmi_alloc(sizeof(*dev));
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if (!dev)
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return;
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dev->type = DMI_DEV_TYPE_IPMI;
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dev->name = "IPMI controller";
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dev->device_data = data;
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list_add_tail(&dev->list, &dmi_devices);
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}
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static void __init dmi_save_dev_pciaddr(int instance, int segment, int bus,
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int devfn, const char *name, int type)
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{
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struct dmi_dev_onboard *dev;
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/* Ignore invalid values */
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if (type == DMI_DEV_TYPE_DEV_SLOT &&
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segment == 0xFFFF && bus == 0xFF && devfn == 0xFF)
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return;
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dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
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if (!dev)
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return;
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dev->instance = instance;
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dev->segment = segment;
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dev->bus = bus;
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dev->devfn = devfn;
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strcpy((char *)&dev[1], name);
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dev->dev.type = type;
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dev->dev.name = (char *)&dev[1];
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dev->dev.device_data = dev;
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list_add(&dev->dev.list, &dmi_devices);
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}
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static void __init dmi_save_extended_devices(const struct dmi_header *dm)
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{
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const char *name;
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const u8 *d = (u8 *)dm;
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if (dm->length < 0x0B)
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return;
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/* Skip disabled device */
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if ((d[0x5] & 0x80) == 0)
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return;
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name = dmi_string_nosave(dm, d[0x4]);
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dmi_save_dev_pciaddr(d[0x6], *(u16 *)(d + 0x7), d[0x9], d[0xA], name,
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DMI_DEV_TYPE_DEV_ONBOARD);
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dmi_save_one_device(d[0x5] & 0x7f, name);
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}
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static void __init dmi_save_system_slot(const struct dmi_header *dm)
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{
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const u8 *d = (u8 *)dm;
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/* Need SMBIOS 2.6+ structure */
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if (dm->length < 0x11)
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return;
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dmi_save_dev_pciaddr(*(u16 *)(d + 0x9), *(u16 *)(d + 0xD), d[0xF],
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d[0x10], dmi_string_nosave(dm, d[0x4]),
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DMI_DEV_TYPE_DEV_SLOT);
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}
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static void __init count_mem_devices(const struct dmi_header *dm, void *v)
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{
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if (dm->type != DMI_ENTRY_MEM_DEVICE)
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return;
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dmi_memdev_nr++;
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}
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static void __init save_mem_devices(const struct dmi_header *dm, void *v)
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{
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const char *d = (const char *)dm;
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static int nr;
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u64 bytes;
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u16 size;
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if (dm->type != DMI_ENTRY_MEM_DEVICE || dm->length < 0x13)
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return;
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if (nr >= dmi_memdev_nr) {
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pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n");
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return;
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}
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dmi_memdev[nr].handle = get_unaligned(&dm->handle);
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dmi_memdev[nr].device = dmi_string(dm, d[0x10]);
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dmi_memdev[nr].bank = dmi_string(dm, d[0x11]);
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dmi_memdev[nr].type = d[0x12];
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size = get_unaligned((u16 *)&d[0xC]);
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if (size == 0)
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bytes = 0;
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else if (size == 0xffff)
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bytes = ~0ull;
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else if (size & 0x8000)
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bytes = (u64)(size & 0x7fff) << 10;
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else if (size != 0x7fff || dm->length < 0x20)
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bytes = (u64)size << 20;
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else
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bytes = (u64)get_unaligned((u32 *)&d[0x1C]) << 20;
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dmi_memdev[nr].size = bytes;
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nr++;
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}
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static void __init dmi_memdev_walk(void)
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{
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if (dmi_walk_early(count_mem_devices) == 0 && dmi_memdev_nr) {
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dmi_memdev = dmi_alloc(sizeof(*dmi_memdev) * dmi_memdev_nr);
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if (dmi_memdev)
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dmi_walk_early(save_mem_devices);
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}
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}
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/*
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* Process a DMI table entry. Right now all we care about are the BIOS
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* and machine entries. For 2.5 we should pull the smbus controller info
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* out of here.
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*/
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static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
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{
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switch (dm->type) {
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case 0: /* BIOS Information */
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dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
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dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
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dmi_save_ident(dm, DMI_BIOS_DATE, 8);
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dmi_save_release(dm, DMI_BIOS_RELEASE, 21);
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dmi_save_release(dm, DMI_EC_FIRMWARE_RELEASE, 23);
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break;
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case 1: /* System Information */
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dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
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dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
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dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
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dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
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dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
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dmi_save_ident(dm, DMI_PRODUCT_SKU, 25);
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dmi_save_ident(dm, DMI_PRODUCT_FAMILY, 26);
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break;
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case 2: /* Base Board Information */
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dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
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dmi_save_ident(dm, DMI_BOARD_NAME, 5);
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dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
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dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
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dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
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break;
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case 3: /* Chassis Information */
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dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
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dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
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dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
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dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
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dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
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break;
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case 9: /* System Slots */
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dmi_save_system_slot(dm);
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break;
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case 10: /* Onboard Devices Information */
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dmi_save_devices(dm);
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break;
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case 11: /* OEM Strings */
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dmi_save_oem_strings_devices(dm);
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break;
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case 38: /* IPMI Device Information */
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dmi_save_ipmi_device(dm);
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break;
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case 41: /* Onboard Devices Extended Information */
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dmi_save_extended_devices(dm);
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}
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}
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static int __init print_filtered(char *buf, size_t len, const char *info)
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{
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int c = 0;
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const char *p;
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|
|
if (!info)
|
|
return c;
|
|
|
|
for (p = info; *p; p++)
|
|
if (isprint(*p))
|
|
c += scnprintf(buf + c, len - c, "%c", *p);
|
|
else
|
|
c += scnprintf(buf + c, len - c, "\\x%02x", *p & 0xff);
|
|
return c;
|
|
}
|
|
|
|
static void __init dmi_format_ids(char *buf, size_t len)
|
|
{
|
|
int c = 0;
|
|
const char *board; /* Board Name is optional */
|
|
|
|
c += print_filtered(buf + c, len - c,
|
|
dmi_get_system_info(DMI_SYS_VENDOR));
|
|
c += scnprintf(buf + c, len - c, " ");
|
|
c += print_filtered(buf + c, len - c,
|
|
dmi_get_system_info(DMI_PRODUCT_NAME));
|
|
|
|
board = dmi_get_system_info(DMI_BOARD_NAME);
|
|
if (board) {
|
|
c += scnprintf(buf + c, len - c, "/");
|
|
c += print_filtered(buf + c, len - c, board);
|
|
}
|
|
c += scnprintf(buf + c, len - c, ", BIOS ");
|
|
c += print_filtered(buf + c, len - c,
|
|
dmi_get_system_info(DMI_BIOS_VERSION));
|
|
c += scnprintf(buf + c, len - c, " ");
|
|
c += print_filtered(buf + c, len - c,
|
|
dmi_get_system_info(DMI_BIOS_DATE));
|
|
}
|
|
|
|
/*
|
|
* Check for DMI/SMBIOS headers in the system firmware image. Any
|
|
* SMBIOS header must start 16 bytes before the DMI header, so take a
|
|
* 32 byte buffer and check for DMI at offset 16 and SMBIOS at offset
|
|
* 0. If the DMI header is present, set dmi_ver accordingly (SMBIOS
|
|
* takes precedence) and return 0. Otherwise return 1.
|
|
*/
|
|
static int __init dmi_present(const u8 *buf)
|
|
{
|
|
u32 smbios_ver;
|
|
|
|
if (memcmp(buf, "_SM_", 4) == 0 &&
|
|
buf[5] < 32 && dmi_checksum(buf, buf[5])) {
|
|
smbios_ver = get_unaligned_be16(buf + 6);
|
|
smbios_entry_point_size = buf[5];
|
|
memcpy(smbios_entry_point, buf, smbios_entry_point_size);
|
|
|
|
/* Some BIOS report weird SMBIOS version, fix that up */
|
|
switch (smbios_ver) {
|
|
case 0x021F:
|
|
case 0x0221:
|
|
pr_debug("SMBIOS version fixup (2.%d->2.%d)\n",
|
|
smbios_ver & 0xFF, 3);
|
|
smbios_ver = 0x0203;
|
|
break;
|
|
case 0x0233:
|
|
pr_debug("SMBIOS version fixup (2.%d->2.%d)\n", 51, 6);
|
|
smbios_ver = 0x0206;
|
|
break;
|
|
}
|
|
} else {
|
|
smbios_ver = 0;
|
|
}
|
|
|
|
buf += 16;
|
|
|
|
if (memcmp(buf, "_DMI_", 5) == 0 && dmi_checksum(buf, 15)) {
|
|
if (smbios_ver)
|
|
dmi_ver = smbios_ver;
|
|
else
|
|
dmi_ver = (buf[14] & 0xF0) << 4 | (buf[14] & 0x0F);
|
|
dmi_ver <<= 8;
|
|
dmi_num = get_unaligned_le16(buf + 12);
|
|
dmi_len = get_unaligned_le16(buf + 6);
|
|
dmi_base = get_unaligned_le32(buf + 8);
|
|
|
|
if (dmi_walk_early(dmi_decode) == 0) {
|
|
if (smbios_ver) {
|
|
pr_info("SMBIOS %d.%d present.\n",
|
|
dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);
|
|
} else {
|
|
smbios_entry_point_size = 15;
|
|
memcpy(smbios_entry_point, buf,
|
|
smbios_entry_point_size);
|
|
pr_info("Legacy DMI %d.%d present.\n",
|
|
dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);
|
|
}
|
|
dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
|
|
pr_info("DMI: %s\n", dmi_ids_string);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Check for the SMBIOS 3.0 64-bit entry point signature. Unlike the legacy
|
|
* 32-bit entry point, there is no embedded DMI header (_DMI_) in here.
|
|
*/
|
|
static int __init dmi_smbios3_present(const u8 *buf)
|
|
{
|
|
if (memcmp(buf, "_SM3_", 5) == 0 &&
|
|
buf[6] < 32 && dmi_checksum(buf, buf[6])) {
|
|
dmi_ver = get_unaligned_be24(buf + 7);
|
|
dmi_num = 0; /* No longer specified */
|
|
dmi_len = get_unaligned_le32(buf + 12);
|
|
dmi_base = get_unaligned_le64(buf + 16);
|
|
smbios_entry_point_size = buf[6];
|
|
memcpy(smbios_entry_point, buf, smbios_entry_point_size);
|
|
|
|
if (dmi_walk_early(dmi_decode) == 0) {
|
|
pr_info("SMBIOS %d.%d.%d present.\n",
|
|
dmi_ver >> 16, (dmi_ver >> 8) & 0xFF,
|
|
dmi_ver & 0xFF);
|
|
dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
|
|
pr_info("DMI: %s\n", dmi_ids_string);
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static void __init dmi_scan_machine(void)
|
|
{
|
|
char __iomem *p, *q;
|
|
char buf[32];
|
|
|
|
if (efi_enabled(EFI_CONFIG_TABLES)) {
|
|
/*
|
|
* According to the DMTF SMBIOS reference spec v3.0.0, it is
|
|
* allowed to define both the 64-bit entry point (smbios3) and
|
|
* the 32-bit entry point (smbios), in which case they should
|
|
* either both point to the same SMBIOS structure table, or the
|
|
* table pointed to by the 64-bit entry point should contain a
|
|
* superset of the table contents pointed to by the 32-bit entry
|
|
* point (section 5.2)
|
|
* This implies that the 64-bit entry point should have
|
|
* precedence if it is defined and supported by the OS. If we
|
|
* have the 64-bit entry point, but fail to decode it, fall
|
|
* back to the legacy one (if available)
|
|
*/
|
|
if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) {
|
|
p = dmi_early_remap(efi.smbios3, 32);
|
|
if (p == NULL)
|
|
goto error;
|
|
memcpy_fromio(buf, p, 32);
|
|
dmi_early_unmap(p, 32);
|
|
|
|
if (!dmi_smbios3_present(buf)) {
|
|
dmi_available = 1;
|
|
return;
|
|
}
|
|
}
|
|
if (efi.smbios == EFI_INVALID_TABLE_ADDR)
|
|
goto error;
|
|
|
|
/* This is called as a core_initcall() because it isn't
|
|
* needed during early boot. This also means we can
|
|
* iounmap the space when we're done with it.
|
|
*/
|
|
p = dmi_early_remap(efi.smbios, 32);
|
|
if (p == NULL)
|
|
goto error;
|
|
memcpy_fromio(buf, p, 32);
|
|
dmi_early_unmap(p, 32);
|
|
|
|
if (!dmi_present(buf)) {
|
|
dmi_available = 1;
|
|
return;
|
|
}
|
|
} else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK)) {
|
|
p = dmi_early_remap(SMBIOS_ENTRY_POINT_SCAN_START, 0x10000);
|
|
if (p == NULL)
|
|
goto error;
|
|
|
|
/*
|
|
* Same logic as above, look for a 64-bit entry point
|
|
* first, and if not found, fall back to 32-bit entry point.
|
|
*/
|
|
memcpy_fromio(buf, p, 16);
|
|
for (q = p + 16; q < p + 0x10000; q += 16) {
|
|
memcpy_fromio(buf + 16, q, 16);
|
|
if (!dmi_smbios3_present(buf)) {
|
|
dmi_available = 1;
|
|
dmi_early_unmap(p, 0x10000);
|
|
return;
|
|
}
|
|
memcpy(buf, buf + 16, 16);
|
|
}
|
|
|
|
/*
|
|
* Iterate over all possible DMI header addresses q.
|
|
* Maintain the 32 bytes around q in buf. On the
|
|
* first iteration, substitute zero for the
|
|
* out-of-range bytes so there is no chance of falsely
|
|
* detecting an SMBIOS header.
|
|
*/
|
|
memset(buf, 0, 16);
|
|
for (q = p; q < p + 0x10000; q += 16) {
|
|
memcpy_fromio(buf + 16, q, 16);
|
|
if (!dmi_present(buf)) {
|
|
dmi_available = 1;
|
|
dmi_early_unmap(p, 0x10000);
|
|
return;
|
|
}
|
|
memcpy(buf, buf + 16, 16);
|
|
}
|
|
dmi_early_unmap(p, 0x10000);
|
|
}
|
|
error:
|
|
pr_info("DMI not present or invalid.\n");
|
|
}
|
|
|
|
static ssize_t raw_table_read(struct file *file, struct kobject *kobj,
|
|
struct bin_attribute *attr, char *buf,
|
|
loff_t pos, size_t count)
|
|
{
|
|
memcpy(buf, attr->private + pos, count);
|
|
return count;
|
|
}
|
|
|
|
static BIN_ATTR(smbios_entry_point, S_IRUSR, raw_table_read, NULL, 0);
|
|
static BIN_ATTR(DMI, S_IRUSR, raw_table_read, NULL, 0);
|
|
|
|
static int __init dmi_init(void)
|
|
{
|
|
struct kobject *tables_kobj;
|
|
u8 *dmi_table;
|
|
int ret = -ENOMEM;
|
|
|
|
if (!dmi_available)
|
|
return 0;
|
|
|
|
/*
|
|
* Set up dmi directory at /sys/firmware/dmi. This entry should stay
|
|
* even after farther error, as it can be used by other modules like
|
|
* dmi-sysfs.
|
|
*/
|
|
dmi_kobj = kobject_create_and_add("dmi", firmware_kobj);
|
|
if (!dmi_kobj)
|
|
goto err;
|
|
|
|
tables_kobj = kobject_create_and_add("tables", dmi_kobj);
|
|
if (!tables_kobj)
|
|
goto err;
|
|
|
|
dmi_table = dmi_remap(dmi_base, dmi_len);
|
|
if (!dmi_table)
|
|
goto err_tables;
|
|
|
|
bin_attr_smbios_entry_point.size = smbios_entry_point_size;
|
|
bin_attr_smbios_entry_point.private = smbios_entry_point;
|
|
ret = sysfs_create_bin_file(tables_kobj, &bin_attr_smbios_entry_point);
|
|
if (ret)
|
|
goto err_unmap;
|
|
|
|
bin_attr_DMI.size = dmi_len;
|
|
bin_attr_DMI.private = dmi_table;
|
|
ret = sysfs_create_bin_file(tables_kobj, &bin_attr_DMI);
|
|
if (!ret)
|
|
return 0;
|
|
|
|
sysfs_remove_bin_file(tables_kobj,
|
|
&bin_attr_smbios_entry_point);
|
|
err_unmap:
|
|
dmi_unmap(dmi_table);
|
|
err_tables:
|
|
kobject_del(tables_kobj);
|
|
kobject_put(tables_kobj);
|
|
err:
|
|
pr_err("dmi: Firmware registration failed.\n");
|
|
|
|
return ret;
|
|
}
|
|
subsys_initcall(dmi_init);
|
|
|
|
/**
|
|
* dmi_setup - scan and setup DMI system information
|
|
*
|
|
* Scan the DMI system information. This setups DMI identifiers
|
|
* (dmi_system_id) for printing it out on task dumps and prepares
|
|
* DIMM entry information (dmi_memdev_info) from the SMBIOS table
|
|
* for using this when reporting memory errors.
|
|
*/
|
|
void __init dmi_setup(void)
|
|
{
|
|
dmi_scan_machine();
|
|
if (!dmi_available)
|
|
return;
|
|
|
|
dmi_memdev_walk();
|
|
dump_stack_set_arch_desc("%s", dmi_ids_string);
|
|
}
|
|
|
|
/**
|
|
* dmi_matches - check if dmi_system_id structure matches system DMI data
|
|
* @dmi: pointer to the dmi_system_id structure to check
|
|
*/
|
|
static bool dmi_matches(const struct dmi_system_id *dmi)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
|
|
int s = dmi->matches[i].slot;
|
|
if (s == DMI_NONE)
|
|
break;
|
|
if (s == DMI_OEM_STRING) {
|
|
/* DMI_OEM_STRING must be exact match */
|
|
const struct dmi_device *valid;
|
|
|
|
valid = dmi_find_device(DMI_DEV_TYPE_OEM_STRING,
|
|
dmi->matches[i].substr, NULL);
|
|
if (valid)
|
|
continue;
|
|
} else if (dmi_ident[s]) {
|
|
if (dmi->matches[i].exact_match) {
|
|
if (!strcmp(dmi_ident[s],
|
|
dmi->matches[i].substr))
|
|
continue;
|
|
} else {
|
|
if (strstr(dmi_ident[s],
|
|
dmi->matches[i].substr))
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* No match */
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* dmi_is_end_of_table - check for end-of-table marker
|
|
* @dmi: pointer to the dmi_system_id structure to check
|
|
*/
|
|
static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
|
|
{
|
|
return dmi->matches[0].slot == DMI_NONE;
|
|
}
|
|
|
|
/**
|
|
* dmi_check_system - check system DMI data
|
|
* @list: array of dmi_system_id structures to match against
|
|
* All non-null elements of the list must match
|
|
* their slot's (field index's) data (i.e., each
|
|
* list string must be a substring of the specified
|
|
* DMI slot's string data) to be considered a
|
|
* successful match.
|
|
*
|
|
* Walk the blacklist table running matching functions until someone
|
|
* returns non zero or we hit the end. Callback function is called for
|
|
* each successful match. Returns the number of matches.
|
|
*
|
|
* dmi_setup must be called before this function is called.
|
|
*/
|
|
int dmi_check_system(const struct dmi_system_id *list)
|
|
{
|
|
int count = 0;
|
|
const struct dmi_system_id *d;
|
|
|
|
for (d = list; !dmi_is_end_of_table(d); d++)
|
|
if (dmi_matches(d)) {
|
|
count++;
|
|
if (d->callback && d->callback(d))
|
|
break;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
EXPORT_SYMBOL(dmi_check_system);
|
|
|
|
/**
|
|
* dmi_first_match - find dmi_system_id structure matching system DMI data
|
|
* @list: array of dmi_system_id structures to match against
|
|
* All non-null elements of the list must match
|
|
* their slot's (field index's) data (i.e., each
|
|
* list string must be a substring of the specified
|
|
* DMI slot's string data) to be considered a
|
|
* successful match.
|
|
*
|
|
* Walk the blacklist table until the first match is found. Return the
|
|
* pointer to the matching entry or NULL if there's no match.
|
|
*
|
|
* dmi_setup must be called before this function is called.
|
|
*/
|
|
const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
|
|
{
|
|
const struct dmi_system_id *d;
|
|
|
|
for (d = list; !dmi_is_end_of_table(d); d++)
|
|
if (dmi_matches(d))
|
|
return d;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(dmi_first_match);
|
|
|
|
/**
|
|
* dmi_get_system_info - return DMI data value
|
|
* @field: data index (see enum dmi_field)
|
|
*
|
|
* Returns one DMI data value, can be used to perform
|
|
* complex DMI data checks.
|
|
*/
|
|
const char *dmi_get_system_info(int field)
|
|
{
|
|
return dmi_ident[field];
|
|
}
|
|
EXPORT_SYMBOL(dmi_get_system_info);
|
|
|
|
/**
|
|
* dmi_name_in_serial - Check if string is in the DMI product serial information
|
|
* @str: string to check for
|
|
*/
|
|
int dmi_name_in_serial(const char *str)
|
|
{
|
|
int f = DMI_PRODUCT_SERIAL;
|
|
if (dmi_ident[f] && strstr(dmi_ident[f], str))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dmi_name_in_vendors - Check if string is in the DMI system or board vendor name
|
|
* @str: Case sensitive Name
|
|
*/
|
|
int dmi_name_in_vendors(const char *str)
|
|
{
|
|
static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE };
|
|
int i;
|
|
for (i = 0; fields[i] != DMI_NONE; i++) {
|
|
int f = fields[i];
|
|
if (dmi_ident[f] && strstr(dmi_ident[f], str))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(dmi_name_in_vendors);
|
|
|
|
/**
|
|
* dmi_find_device - find onboard device by type/name
|
|
* @type: device type or %DMI_DEV_TYPE_ANY to match all device types
|
|
* @name: device name string or %NULL to match all
|
|
* @from: previous device found in search, or %NULL for new search.
|
|
*
|
|
* Iterates through the list of known onboard devices. If a device is
|
|
* found with a matching @type and @name, a pointer to its device
|
|
* structure is returned. Otherwise, %NULL is returned.
|
|
* A new search is initiated by passing %NULL as the @from argument.
|
|
* If @from is not %NULL, searches continue from next device.
|
|
*/
|
|
const struct dmi_device *dmi_find_device(int type, const char *name,
|
|
const struct dmi_device *from)
|
|
{
|
|
const struct list_head *head = from ? &from->list : &dmi_devices;
|
|
struct list_head *d;
|
|
|
|
for (d = head->next; d != &dmi_devices; d = d->next) {
|
|
const struct dmi_device *dev =
|
|
list_entry(d, struct dmi_device, list);
|
|
|
|
if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
|
|
((name == NULL) || (strcmp(dev->name, name) == 0)))
|
|
return dev;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(dmi_find_device);
|
|
|
|
/**
|
|
* dmi_get_date - parse a DMI date
|
|
* @field: data index (see enum dmi_field)
|
|
* @yearp: optional out parameter for the year
|
|
* @monthp: optional out parameter for the month
|
|
* @dayp: optional out parameter for the day
|
|
*
|
|
* The date field is assumed to be in the form resembling
|
|
* [mm[/dd]]/yy[yy] and the result is stored in the out
|
|
* parameters any or all of which can be omitted.
|
|
*
|
|
* If the field doesn't exist, all out parameters are set to zero
|
|
* and false is returned. Otherwise, true is returned with any
|
|
* invalid part of date set to zero.
|
|
*
|
|
* On return, year, month and day are guaranteed to be in the
|
|
* range of [0,9999], [0,12] and [0,31] respectively.
|
|
*/
|
|
bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
|
|
{
|
|
int year = 0, month = 0, day = 0;
|
|
bool exists;
|
|
const char *s, *y;
|
|
char *e;
|
|
|
|
s = dmi_get_system_info(field);
|
|
exists = s;
|
|
if (!exists)
|
|
goto out;
|
|
|
|
/*
|
|
* Determine year first. We assume the date string resembles
|
|
* mm/dd/yy[yy] but the original code extracted only the year
|
|
* from the end. Keep the behavior in the spirit of no
|
|
* surprises.
|
|
*/
|
|
y = strrchr(s, '/');
|
|
if (!y)
|
|
goto out;
|
|
|
|
y++;
|
|
year = simple_strtoul(y, &e, 10);
|
|
if (y != e && year < 100) { /* 2-digit year */
|
|
year += 1900;
|
|
if (year < 1996) /* no dates < spec 1.0 */
|
|
year += 100;
|
|
}
|
|
if (year > 9999) /* year should fit in %04d */
|
|
year = 0;
|
|
|
|
/* parse the mm and dd */
|
|
month = simple_strtoul(s, &e, 10);
|
|
if (s == e || *e != '/' || !month || month > 12) {
|
|
month = 0;
|
|
goto out;
|
|
}
|
|
|
|
s = e + 1;
|
|
day = simple_strtoul(s, &e, 10);
|
|
if (s == y || s == e || *e != '/' || day > 31)
|
|
day = 0;
|
|
out:
|
|
if (yearp)
|
|
*yearp = year;
|
|
if (monthp)
|
|
*monthp = month;
|
|
if (dayp)
|
|
*dayp = day;
|
|
return exists;
|
|
}
|
|
EXPORT_SYMBOL(dmi_get_date);
|
|
|
|
/**
|
|
* dmi_get_bios_year - get a year out of DMI_BIOS_DATE field
|
|
*
|
|
* Returns year on success, -ENXIO if DMI is not selected,
|
|
* or a different negative error code if DMI field is not present
|
|
* or not parseable.
|
|
*/
|
|
int dmi_get_bios_year(void)
|
|
{
|
|
bool exists;
|
|
int year;
|
|
|
|
exists = dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL);
|
|
if (!exists)
|
|
return -ENODATA;
|
|
|
|
return year ? year : -ERANGE;
|
|
}
|
|
EXPORT_SYMBOL(dmi_get_bios_year);
|
|
|
|
/**
|
|
* dmi_walk - Walk the DMI table and get called back for every record
|
|
* @decode: Callback function
|
|
* @private_data: Private data to be passed to the callback function
|
|
*
|
|
* Returns 0 on success, -ENXIO if DMI is not selected or not present,
|
|
* or a different negative error code if DMI walking fails.
|
|
*/
|
|
int dmi_walk(void (*decode)(const struct dmi_header *, void *),
|
|
void *private_data)
|
|
{
|
|
u8 *buf;
|
|
|
|
if (!dmi_available)
|
|
return -ENXIO;
|
|
|
|
buf = dmi_remap(dmi_base, dmi_len);
|
|
if (buf == NULL)
|
|
return -ENOMEM;
|
|
|
|
dmi_decode_table(buf, decode, private_data);
|
|
|
|
dmi_unmap(buf);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dmi_walk);
|
|
|
|
/**
|
|
* dmi_match - compare a string to the dmi field (if exists)
|
|
* @f: DMI field identifier
|
|
* @str: string to compare the DMI field to
|
|
*
|
|
* Returns true if the requested field equals to the str (including NULL).
|
|
*/
|
|
bool dmi_match(enum dmi_field f, const char *str)
|
|
{
|
|
const char *info = dmi_get_system_info(f);
|
|
|
|
if (info == NULL || str == NULL)
|
|
return info == str;
|
|
|
|
return !strcmp(info, str);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dmi_match);
|
|
|
|
void dmi_memdev_name(u16 handle, const char **bank, const char **device)
|
|
{
|
|
int n;
|
|
|
|
if (dmi_memdev == NULL)
|
|
return;
|
|
|
|
for (n = 0; n < dmi_memdev_nr; n++) {
|
|
if (handle == dmi_memdev[n].handle) {
|
|
*bank = dmi_memdev[n].bank;
|
|
*device = dmi_memdev[n].device;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(dmi_memdev_name);
|
|
|
|
u64 dmi_memdev_size(u16 handle)
|
|
{
|
|
int n;
|
|
|
|
if (dmi_memdev) {
|
|
for (n = 0; n < dmi_memdev_nr; n++) {
|
|
if (handle == dmi_memdev[n].handle)
|
|
return dmi_memdev[n].size;
|
|
}
|
|
}
|
|
return ~0ull;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dmi_memdev_size);
|
|
|
|
/**
|
|
* dmi_memdev_type - get the memory type
|
|
* @handle: DMI structure handle
|
|
*
|
|
* Return the DMI memory type of the module in the slot associated with the
|
|
* given DMI handle, or 0x0 if no such DMI handle exists.
|
|
*/
|
|
u8 dmi_memdev_type(u16 handle)
|
|
{
|
|
int n;
|
|
|
|
if (dmi_memdev) {
|
|
for (n = 0; n < dmi_memdev_nr; n++) {
|
|
if (handle == dmi_memdev[n].handle)
|
|
return dmi_memdev[n].type;
|
|
}
|
|
}
|
|
return 0x0; /* Not a valid value */
|
|
}
|
|
EXPORT_SYMBOL_GPL(dmi_memdev_type);
|
|
|
|
/**
|
|
* dmi_memdev_handle - get the DMI handle of a memory slot
|
|
* @slot: slot number
|
|
*
|
|
* Return the DMI handle associated with a given memory slot, or %0xFFFF
|
|
* if there is no such slot.
|
|
*/
|
|
u16 dmi_memdev_handle(int slot)
|
|
{
|
|
if (dmi_memdev && slot >= 0 && slot < dmi_memdev_nr)
|
|
return dmi_memdev[slot].handle;
|
|
|
|
return 0xffff; /* Not a valid value */
|
|
}
|
|
EXPORT_SYMBOL_GPL(dmi_memdev_handle);
|