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firmware/dmi: Report DMI Bios & EC firmware release 

Some vendors like HPe or Dell, encode the release version of their BIOS
in the "System BIOS {Major|Minor} Release" fields of Type 0.

This information is used to know which bios release actually runs.
It could be used for some quirks, debugging sessions or inventory tasks.

A typical output for a Dell system running the 65.27 bios is :
	[root@t1700 ~]# cat /sys/devices/virtual/dmi/id/bios_release
	65.27
	[root@t1700 ~]#

Servers that have a BMC encode the release version of their firmware in the
 "Embedded Controller Firmware {Major|Minor} Release" fields of Type 0.

This information is used to know which BMC release actually runs.
It could be used for some quirks, debugging sessions or inventory tasks.

A typical output for a Dell system running the 3.75 bmc release is :
    [root@t1700 ~]# cat /sys/devices/virtual/dmi/id/ec_firmware_release
    3.75
    [root@t1700 ~]#

Signed-off-by: Erwan Velu <e.velu@criteo.com>
Signed-off-by: Jean Delvare <jdelvare@suse.de>
This commit is contained in:
Erwan Velu 2020-06-06 11:35:50 +02:00 committed by Jean Delvare
parent 3d77e6a880
commit f5152f4ded
4 changed files with 40 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/firmware/dmi-id.c
View File

@ -42,6 +42,8 @@ DEFINE_DMI_ATTR_WITH_SHOW(bios_vendor, 0444, DMI_BIOS_VENDOR);
DEFINE_DMI_ATTR_WITH_SHOW(bios_version, 0444, DMI_BIOS_VERSION);
DEFINE_DMI_ATTR_WITH_SHOW(bios_date, 0444, DMI_BIOS_DATE);
DEFINE_DMI_ATTR_WITH_SHOW(sys_vendor, 0444, DMI_SYS_VENDOR);
DEFINE_DMI_ATTR_WITH_SHOW(bios_release, 0444, DMI_BIOS_RELEASE);
DEFINE_DMI_ATTR_WITH_SHOW(ec_firmware_release, 0444, DMI_EC_FIRMWARE_RELEASE);
DEFINE_DMI_ATTR_WITH_SHOW(product_name, 0444, DMI_PRODUCT_NAME);
DEFINE_DMI_ATTR_WITH_SHOW(product_version, 0444, DMI_PRODUCT_VERSION);
DEFINE_DMI_ATTR_WITH_SHOW(product_serial, 0400, DMI_PRODUCT_SERIAL);
@ -78,6 +80,8 @@ static ssize_t get_modalias(char *buffer, size_t buffer_size)
{ "bvn", DMI_BIOS_VENDOR },
{ "bvr", DMI_BIOS_VERSION },
{ "bd", DMI_BIOS_DATE },
{ "br", DMI_BIOS_RELEASE },
{ "efr", DMI_EC_FIRMWARE_RELEASE },
{ "svn", DMI_SYS_VENDOR },
{ "pn", DMI_PRODUCT_NAME },
{ "pvr", DMI_PRODUCT_VERSION },
@ -187,6 +191,8 @@ static void __init dmi_id_init_attr_table(void)
ADD_DMI_ATTR(bios_vendor, DMI_BIOS_VENDOR);
ADD_DMI_ATTR(bios_version, DMI_BIOS_VERSION);
ADD_DMI_ATTR(bios_date, DMI_BIOS_DATE);
ADD_DMI_ATTR(bios_release, DMI_BIOS_RELEASE);
ADD_DMI_ATTR(ec_firmware_release, DMI_EC_FIRMWARE_RELEASE);
ADD_DMI_ATTR(sys_vendor, DMI_SYS_VENDOR);
ADD_DMI_ATTR(product_name, DMI_PRODUCT_NAME);
ADD_DMI_ATTR(product_version, DMI_PRODUCT_VERSION);

30
drivers/firmware/dmi_scan.c
View File

@ -186,6 +186,34 @@ 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)
{
@ -444,6 +472,8 @@ 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);

2
include/linux/mod_devicetable.h
View File

@ -532,6 +532,8 @@ enum dmi_field {
DMI_BIOS_VENDOR,
DMI_BIOS_VERSION,
DMI_BIOS_DATE,
DMI_BIOS_RELEASE,
DMI_EC_FIRMWARE_RELEASE,
DMI_SYS_VENDOR,
DMI_PRODUCT_NAME,
DMI_PRODUCT_VERSION,

2
scripts/mod/file2alias.c
View File

@ -954,6 +954,8 @@ static const struct dmifield {
{ "bvn", DMI_BIOS_VENDOR },
{ "bvr", DMI_BIOS_VERSION },
{ "bd", DMI_BIOS_DATE },
{ "br", DMI_BIOS_RELEASE },
{ "efr", DMI_EC_FIRMWARE_RELEASE },
{ "svn", DMI_SYS_VENDOR },
{ "pn", DMI_PRODUCT_NAME },
{ "pvr", DMI_PRODUCT_VERSION },