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path: root/drivers/firmware/dmi_scan.c
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Diffstat (limited to 'drivers/firmware/dmi_scan.c')
-rw-r--r--drivers/firmware/dmi_scan.c280
1 files changed, 212 insertions, 68 deletions
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 783041964439..70d39adf50dc 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
#include <linux/types.h>
#include <linux/string.h>
#include <linux/init.h>
@@ -5,10 +6,14 @@
#include <linux/ctype.h>
#include <linux/dmi.h>
#include <linux/efi.h>
-#include <linux/bootmem.h>
+#include <linux/memblock.h>
#include <linux/random.h>
#include <asm/dmi.h>
-#include <asm/unaligned.h>
+#include <linux/unaligned.h>
+
+#ifndef SMBIOS_ENTRY_POINT_SCAN_START
+#define SMBIOS_ENTRY_POINT_SCAN_START 0xF0000
+#endif
struct kobject *dmi_kobj;
EXPORT_SYMBOL_GPL(dmi_kobj);
@@ -16,9 +21,9 @@ EXPORT_SYMBOL_GPL(dmi_kobj);
/*
* DMI stands for "Desktop Management Interface". It is part
* of and an antecedent to, SMBIOS, which stands for System
- * Management BIOS. See further: http://www.dmtf.org/standards
+ * Management BIOS. See further: https://www.dmtf.org/standards
*/
-static const char dmi_empty_string[] = " ";
+static const char dmi_empty_string[] = "";
static u32 dmi_ver __initdata;
static u32 dmi_len;
@@ -26,43 +31,37 @@ static u16 dmi_num;
static u8 smbios_entry_point[32];
static int smbios_entry_point_size;
-/*
- * Catch too early calls to dmi_check_system():
- */
-static int dmi_initialized;
-
/* DMI system identification string used during boot */
static char dmi_ids_string[128] __initdata;
static struct dmi_memdev_info {
const char *device;
const char *bank;
+ u64 size; /* bytes */
u16 handle;
+ u8 type; /* DDR2, DDR3, DDR4 etc */
} *dmi_memdev;
static int dmi_memdev_nr;
+static int dmi_memdev_populated_nr __initdata;
static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
{
const u8 *bp = ((u8 *) dm) + dm->length;
+ const u8 *nsp;
if (s) {
- s--;
- while (s > 0 && *bp) {
+ while (--s > 0 && *bp)
bp += strlen(bp) + 1;
- s--;
- }
-
- if (*bp != 0) {
- size_t len = strlen(bp)+1;
- size_t cmp_len = len > 8 ? 8 : len;
- if (!memcmp(bp, dmi_empty_string, cmp_len))
- return dmi_empty_string;
+ /* Strings containing only spaces are considered empty */
+ nsp = bp;
+ while (*nsp == ' ')
+ nsp++;
+ if (*nsp != '\0')
return bp;
- }
}
- return "";
+ return dmi_empty_string;
}
static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
@@ -104,6 +103,17 @@ static void dmi_decode_table(u8 *buf,
const struct dmi_header *dm = (const struct dmi_header *)data;
/*
+ * If a short entry is found (less than 4 bytes), not only it
+ * is invalid, but we cannot reliably locate the next entry.
+ */
+ if (dm->length < sizeof(struct dmi_header)) {
+ pr_warn(FW_BUG
+ "Corrupted DMI table, offset %zd (only %d entries processed)\n",
+ data - buf, i);
+ break;
+ }
+
+ /*
* We want to know the total length (formatted area and
* strings) before decoding to make sure we won't run off the
* table in dmi_decode or dmi_string
@@ -168,6 +178,7 @@ static int __init dmi_checksum(const u8 *buf, u8 len)
static const char *dmi_ident[DMI_STRING_MAX];
static LIST_HEAD(dmi_devices);
int dmi_available;
+EXPORT_SYMBOL_GPL(dmi_available);
/*
* Save a DMI string
@@ -188,6 +199,34 @@ static void __init dmi_save_ident(const struct dmi_header *dm, int slot,
dmi_ident[slot] = p;
}
+static void __init dmi_save_release(const struct dmi_header *dm, int slot,
+ int index)
+{
+ const u8 *minor, *major;
+ char *s;
+
+ /* If the table doesn't have the field, let's return */
+ if (dmi_ident[slot] || dm->length < index)
+ return;
+
+ minor = (u8 *) dm + index;
+ major = (u8 *) dm + index - 1;
+
+ /* As per the spec, if the system doesn't support this field,
+ * the value is FF
+ */
+ if (*major == 0xFF && *minor == 0xFF)
+ return;
+
+ s = dmi_alloc(8);
+ if (!s)
+ return;
+
+ sprintf(s, "%u.%u", *major, *minor);
+
+ dmi_ident[slot] = s;
+}
+
static void __init dmi_save_uuid(const struct dmi_header *dm, int slot,
int index)
{
@@ -195,7 +234,7 @@ static void __init dmi_save_uuid(const struct dmi_header *dm, int slot,
char *s;
int is_ff = 1, is_00 = 1, i;
- if (dmi_ident[slot] || dm->length <= index + 16)
+ if (dmi_ident[slot] || dm->length < index + 16)
return;
d = (u8 *) dm + index;
@@ -219,9 +258,9 @@ static void __init dmi_save_uuid(const struct dmi_header *dm, int slot,
* says that this is the defacto standard.
*/
if (dmi_ver >= 0x020600)
- sprintf(s, "%pUL", d);
+ sprintf(s, "%pUl", d);
else
- sprintf(s, "%pUB", d);
+ sprintf(s, "%pUb", d);
dmi_ident[slot] = s;
}
@@ -395,8 +434,10 @@ static void __init save_mem_devices(const struct dmi_header *dm, void *v)
{
const char *d = (const char *)dm;
static int nr;
+ u64 bytes;
+ u16 size;
- if (dm->type != DMI_ENTRY_MEM_DEVICE || dm->length < 0x12)
+ if (dm->type != DMI_ENTRY_MEM_DEVICE || dm->length < 0x13)
return;
if (nr >= dmi_memdev_nr) {
pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n");
@@ -405,14 +446,29 @@ static void __init save_mem_devices(const struct dmi_header *dm, void *v)
dmi_memdev[nr].handle = get_unaligned(&dm->handle);
dmi_memdev[nr].device = dmi_string(dm, d[0x10]);
dmi_memdev[nr].bank = dmi_string(dm, d[0x11]);
+ dmi_memdev[nr].type = d[0x12];
+
+ size = get_unaligned((u16 *)&d[0xC]);
+ if (size == 0)
+ bytes = 0;
+ else if (size == 0xffff)
+ bytes = ~0ull;
+ else if (size & 0x8000)
+ bytes = (u64)(size & 0x7fff) << 10;
+ else if (size != 0x7fff || dm->length < 0x20)
+ bytes = (u64)size << 20;
+ else
+ bytes = (u64)get_unaligned((u32 *)&d[0x1C]) << 20;
+
+ if (bytes)
+ dmi_memdev_populated_nr++;
+
+ dmi_memdev[nr].size = bytes;
nr++;
}
-void __init dmi_memdev_walk(void)
+static void __init dmi_memdev_walk(void)
{
- if (!dmi_available)
- return;
-
if (dmi_walk_early(count_mem_devices) == 0 && dmi_memdev_nr) {
dmi_memdev = dmi_alloc(sizeof(*dmi_memdev) * dmi_memdev_nr);
if (dmi_memdev)
@@ -432,6 +488,8 @@ static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
dmi_save_ident(dm, DMI_BIOS_DATE, 8);
+ dmi_save_release(dm, DMI_BIOS_RELEASE, 21);
+ dmi_save_release(dm, DMI_EC_FIRMWARE_RELEASE, 23);
break;
case 1: /* System Information */
dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
@@ -439,6 +497,7 @@ static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
+ dmi_save_ident(dm, DMI_PRODUCT_SKU, 25);
dmi_save_ident(dm, DMI_PRODUCT_FAMILY, 26);
break;
case 2: /* Base Board Information */
@@ -523,8 +582,13 @@ static int __init dmi_present(const u8 *buf)
{
u32 smbios_ver;
+ /*
+ * The size of this structure is 31 bytes, but we also accept value
+ * 30 due to a mistake in SMBIOS specification version 2.1.
+ */
if (memcmp(buf, "_SM_", 4) == 0 &&
- buf[5] < 32 && dmi_checksum(buf, buf[5])) {
+ buf[5] >= 30 && 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);
@@ -585,8 +649,9 @@ static int __init dmi_present(const u8 *buf)
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_be32(buf + 6) & 0xFFFFFF;
+ buf[6] >= 24 && 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);
@@ -605,7 +670,7 @@ static int __init dmi_smbios3_present(const u8 *buf)
return 1;
}
-void __init dmi_scan_machine(void)
+static void __init dmi_scan_machine(void)
{
char __iomem *p, *q;
char buf[32];
@@ -633,7 +698,7 @@ void __init dmi_scan_machine(void)
if (!dmi_smbios3_present(buf)) {
dmi_available = 1;
- goto out;
+ return;
}
}
if (efi.smbios == EFI_INVALID_TABLE_ADDR)
@@ -651,10 +716,10 @@ void __init dmi_scan_machine(void)
if (!dmi_present(buf)) {
dmi_available = 1;
- goto out;
+ return;
}
} else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK)) {
- p = dmi_early_remap(0xF0000, 0x10000);
+ p = dmi_early_remap(SMBIOS_ENTRY_POINT_SCAN_START, 0x10000);
if (p == NULL)
goto error;
@@ -668,7 +733,7 @@ void __init dmi_scan_machine(void)
if (!dmi_smbios3_present(buf)) {
dmi_available = 1;
dmi_early_unmap(p, 0x10000);
- goto out;
+ return;
}
memcpy(buf, buf + 16, 16);
}
@@ -686,7 +751,7 @@ void __init dmi_scan_machine(void)
if (!dmi_present(buf)) {
dmi_available = 1;
dmi_early_unmap(p, 0x10000);
- goto out;
+ return;
}
memcpy(buf, buf + 16, 16);
}
@@ -694,20 +759,10 @@ void __init dmi_scan_machine(void)
}
error:
pr_info("DMI not present or invalid.\n");
- out:
- dmi_initialized = 1;
}
-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 __ro_after_init BIN_ATTR_SIMPLE_ADMIN_RO(smbios_entry_point);
+static __ro_after_init BIN_ATTR_SIMPLE_ADMIN_RO(DMI);
static int __init dmi_init(void)
{
@@ -715,10 +770,8 @@ static int __init dmi_init(void)
u8 *dmi_table;
int ret = -ENOMEM;
- if (!dmi_available) {
- ret = -ENODATA;
- goto err;
- }
+ if (!dmi_available)
+ return 0;
/*
* Set up dmi directory at /sys/firmware/dmi. This entry should stay
@@ -764,15 +817,22 @@ static int __init dmi_init(void)
subsys_initcall(dmi_init);
/**
- * dmi_set_dump_stack_arch_desc - set arch description for dump_stack()
+ * dmi_setup - scan and setup DMI system information
*
- * Invoke dump_stack_set_arch_desc() with DMI system information so that
- * DMI identifiers are printed out on task dumps. Arch boot code should
- * call this function after dmi_scan_machine() if it wants to print out DMI
- * identifiers on task dumps.
+ * 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_set_dump_stack_arch_desc(void)
+void __init dmi_setup(void)
{
+ dmi_scan_machine();
+ if (!dmi_available)
+ return;
+
+ dmi_memdev_walk();
+ pr_info("DMI: Memory slots populated: %d/%d\n",
+ dmi_memdev_populated_nr, dmi_memdev_nr);
dump_stack_set_arch_desc("%s", dmi_ids_string);
}
@@ -784,19 +844,28 @@ static bool dmi_matches(const struct dmi_system_id *dmi)
{
int i;
- WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n");
-
for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
int s = dmi->matches[i].slot;
if (s == DMI_NONE)
break;
- if (dmi_ident[s]) {
- if (!dmi->matches[i].exact_match &&
- strstr(dmi_ident[s], dmi->matches[i].substr))
- continue;
- else if (dmi->matches[i].exact_match &&
- !strcmp(dmi_ident[s], dmi->matches[i].substr))
+ 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 */
@@ -826,6 +895,8 @@ static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
* 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)
{
@@ -854,6 +925,8 @@ EXPORT_SYMBOL(dmi_check_system);
*
* 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)
{
@@ -1013,6 +1086,26 @@ out:
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
@@ -1073,3 +1166,54 @@ void dmi_memdev_name(u16 handle, const char **bank, const char **device)
}
}
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);
generated by cgit (git 2.34.1) at 2025-12-25 05:19:44 +0000