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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.c123
1 files changed, 105 insertions, 18 deletions
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 97b1616aa391..ac1ce4a73edf 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -10,6 +10,9 @@
#include <asm/dmi.h>
#include <asm/unaligned.h>
+struct kobject *dmi_kobj;
+EXPORT_SYMBOL_GPL(dmi_kobj);
+
/*
* DMI stands for "Desktop Management Interface". It is part
* of and an antecedent to, SMBIOS, which stands for System
@@ -20,6 +23,9 @@ static const char dmi_empty_string[] = " ";
static u32 dmi_ver __initdata;
static u32 dmi_len;
static u16 dmi_num;
+static u8 smbios_entry_point[32];
+static int smbios_entry_point_size;
+
/*
* Catch too early calls to dmi_check_system():
*/
@@ -80,18 +86,18 @@ static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
* We have to be cautious here. We have seen BIOSes with DMI pointers
* pointing to completely the wrong place for example
*/
-static void dmi_table(u8 *buf,
- void (*decode)(const struct dmi_header *, void *),
- void *private_data)
+static void dmi_decode_table(u8 *buf,
+ void (*decode)(const struct dmi_header *, void *),
+ void *private_data)
{
u8 *data = buf;
int i = 0;
/*
* Stop when we have seen all the items the table claimed to have
- * (SMBIOS < 3.0 only) OR we reach an end-of-table marker OR we run
- * off the end of the table (should never happen but sometimes does
- * on bogus implementations.)
+ * (SMBIOS < 3.0 only) OR we reach an end-of-table marker (SMBIOS
+ * >= 3.0 only) OR we run off the end of the table (should never
+ * happen but sometimes does on bogus implementations.)
*/
while ((!dmi_num || i < dmi_num) &&
(data - buf + sizeof(struct dmi_header)) <= dmi_len) {
@@ -108,15 +114,24 @@ static void dmi_table(u8 *buf,
if (data - buf < dmi_len - 1)
decode(dm, private_data);
+ data += 2;
+ i++;
+
/*
* 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
+ * For tables behind a 64-bit entry point, we have no item
+ * count and no exact table length, so stop on end-of-table
+ * marker. For tables behind a 32-bit entry point, we have
+ * seen OEM structures behind the end-of-table marker on
+ * some systems, so don't trust it.
*/
- if (dm->type == DMI_ENTRY_END_OF_TABLE)
+ if (!dmi_num && dm->type == DMI_ENTRY_END_OF_TABLE)
break;
-
- data += 2;
- i++;
}
+
+ /* Trim DMI table length if needed */
+ if (dmi_len > data - buf)
+ dmi_len = data - buf;
}
static phys_addr_t dmi_base;
@@ -125,16 +140,17 @@ static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
void *))
{
u8 *buf;
+ u32 orig_dmi_len = dmi_len;
- buf = dmi_early_remap(dmi_base, dmi_len);
+ buf = dmi_early_remap(dmi_base, orig_dmi_len);
if (buf == NULL)
return -1;
- dmi_table(buf, decode, NULL);
+ dmi_decode_table(buf, decode, NULL);
add_device_randomness(buf, dmi_len);
- dmi_early_unmap(buf, dmi_len);
+ dmi_early_unmap(buf, orig_dmi_len);
return 0;
}
@@ -478,17 +494,19 @@ static int __init dmi_present(const u8 *buf)
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",
+ 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);
+ pr_debug("SMBIOS version fixup (2.%d->2.%d)\n", 51, 6);
smbios_ver = 0x0206;
break;
}
@@ -512,6 +530,9 @@ static int __init dmi_present(const u8 *buf)
pr_info("SMBIOS %d.%d present.\n",
dmi_ver >> 8, dmi_ver & 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 >> 8, dmi_ver & 0xFF);
}
@@ -533,11 +554,12 @@ 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);
- dmi_ver &= 0xFFFFFF;
+ dmi_ver = get_unaligned_be32(buf + 6) & 0xFFFFFF;
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",
@@ -629,6 +651,71 @@ void __init dmi_scan_machine(void)
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 int __init dmi_init(void)
+{
+ struct kobject *tables_kobj;
+ u8 *dmi_table;
+ int ret = -ENOMEM;
+
+ if (!dmi_available) {
+ ret = -ENODATA;
+ goto err;
+ }
+
+ /*
+ * 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_set_dump_stack_arch_desc - set arch description for dump_stack()
*
@@ -897,7 +984,7 @@ int dmi_walk(void (*decode)(const struct dmi_header *, void *),
if (buf == NULL)
return -1;
- dmi_table(buf, decode, private_data);
+ dmi_decode_table(buf, decode, private_data);
dmi_unmap(buf);
return 0;
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-14 13:03:42 +0300