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efi: Export Runtime Configuration Interface table to sysfs

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System firmware advertises the address of the 'Runtime
Configuration Interface table version 2 (RCI2)' via
an EFI Configuration Table entry. This code retrieves the RCI2
table from the address and exports it to sysfs as a binary
attribute 'rci2' under /sys/firmware/efi/tables directory.
The approach adopted is similar to the attribute 'DMI' under
/sys/firmware/dmi/tables.

RCI2 table contains BIOS HII in XML format and is used to populate
BIOS setup page in Dell EMC OpenManage Server Administrator tool.
The BIOS setup page contains BIOS tokens which can be configured.

Signed-off-by: Narendra K <Narendra.K@dell.com>
Reviewed-by: Mario Limonciello <mario.limonciello@dell.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
This commit is contained in:
Narendra K 2019-07-10 18:59:15 +00:00 committed by Ard Biesheuvel
parent 5828efb95b
commit 1c5fecb612
7 changed files with 180 additions and 0 deletions
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8
Documentation/ABI/testing/sysfs-firmware-efi
View file

@ -28,3 +28,11 @@ Description: Displays the physical addresses of all EFI Configuration
versions are always printed first, i.e. ACPI20 comes
before ACPI.
Users: dmidecode
What: /sys/firmware/efi/tables/rci2
Date: July 2019
Contact: Narendra K <Narendra.K@dell.com>, linux-bugs@dell.com
Description: Displays the content of the Runtime Configuration Interface
Table version 2 on Dell EMC PowerEdge systems in binary format
Users: It is used by Dell EMC OpenManage Server Administrator tool to
populate BIOS setup page.

3
arch/x86/platform/efi/efi.c
View file

@ -82,6 +82,9 @@ static const unsigned long * const efi_tables[] = {
&efi.esrt,
&efi.properties_table,
&efi.mem_attr_table,
#ifdef CONFIG_EFI_RCI2_TABLE
&rci2_table_phys,
#endif
};
u64 efi_setup; /* efi setup_data physical address */

13
drivers/firmware/efi/Kconfig
View file

@ -180,6 +180,19 @@ config RESET_ATTACK_MITIGATION
have been evicted, since otherwise it will trigger even on clean
reboots.
config EFI_RCI2_TABLE
bool "EFI Runtime Configuration Interface Table Version 2 Support"
help
Displays the content of the Runtime Configuration Interface
Table version 2 on Dell EMC PowerEdge systems as a binary
attribute 'rci2' under /sys/firmware/efi/tables directory.
RCI2 table contains BIOS HII in XML format and is used to populate
BIOS setup page in Dell EMC OpenManage Server Administrator tool.
The BIOS setup page contains BIOS tokens which can be configured.
Say Y here for Dell EMC PowerEdge systems.
endmenu
config UEFI_CPER

1
drivers/firmware/efi/Makefile
View file

@ -25,6 +25,7 @@ obj-$(CONFIG_EFI_BOOTLOADER_CONTROL) += efibc.o
obj-$(CONFIG_EFI_TEST) += test/
obj-$(CONFIG_EFI_DEV_PATH_PARSER) += dev-path-parser.o
obj-$(CONFIG_APPLE_PROPERTIES) += apple-properties.o
obj-$(CONFIG_EFI_RCI2_TABLE) += rci2-table.o
arm-obj-$(CONFIG_EFI) := arm-init.o arm-runtime.o
obj-$(CONFIG_ARM) += $(arm-obj-y)

3
drivers/firmware/efi/efi.c
View file

@ -465,6 +465,9 @@ static __initdata efi_config_table_type_t common_tables[] = {
{LINUX_EFI_TPM_EVENT_LOG_GUID, "TPMEventLog", &efi.tpm_log},
{LINUX_EFI_TPM_FINAL_LOG_GUID, "TPMFinalLog", &efi.tpm_final_log},
{LINUX_EFI_MEMRESERVE_TABLE_GUID, "MEMRESERVE", &efi.mem_reserve},
#ifdef CONFIG_EFI_RCI2_TABLE
{DELLEMC_EFI_RCI2_TABLE_GUID, NULL, &rci2_table_phys},
#endif
{NULL_GUID, NULL, NULL},
};

147
drivers/firmware/efi/rci2-table.c Normal file
View file

@ -0,0 +1,147 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Export Runtime Configuration Interface Table Version 2 (RCI2)
* to sysfs
*
* Copyright (C) 2019 Dell Inc
* by Narendra K <Narendra.K@dell.com>
*
* System firmware advertises the address of the RCI2 Table via
* an EFI Configuration Table entry. This code retrieves the RCI2
* table from the address and exports it to sysfs as a binary
* attribute 'rci2' under /sys/firmware/efi/tables directory.
*/
#include <linux/kobject.h>
#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/efi.h>
#include <linux/types.h>
#include <linux/io.h>
#define RCI_SIGNATURE "_RC_"
struct rci2_table_global_hdr {
u16 type;
u16 resvd0;
u16 hdr_len;
u8 rci2_sig[4];
u16 resvd1;
u32 resvd2;
u32 resvd3;
u8 major_rev;
u8 minor_rev;
u16 num_of_structs;
u32 rci2_len;
u16 rci2_chksum;
} __packed;
static u8 *rci2_base;
static u32 rci2_table_len;
unsigned long rci2_table_phys __ro_after_init = EFI_INVALID_TABLE_ADDR;
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(rci2, S_IRUSR, raw_table_read, NULL, 0);
static u16 checksum(void)
{
u8 len_is_odd = rci2_table_len % 2;
u32 chksum_len = rci2_table_len;
u16 *base = (u16 *)rci2_base;
u8 buf[2] = {0};
u32 offset = 0;
u16 chksum = 0;
if (len_is_odd)
chksum_len -= 1;
while (offset < chksum_len) {
chksum += *base;
offset += 2;
base++;
}
if (len_is_odd) {
buf[0] = *(u8 *)base;
chksum += *(u16 *)(buf);
}
return chksum;
}
int __init efi_rci2_sysfs_init(void)
{
struct kobject *tables_kobj;
int ret = -ENOMEM;
rci2_base = memremap(rci2_table_phys,
sizeof(struct rci2_table_global_hdr),
MEMREMAP_WB);
if (!rci2_base) {
pr_debug("RCI2 table init failed - could not map RCI2 table\n");
goto err;
}
if (strncmp(rci2_base +
offsetof(struct rci2_table_global_hdr, rci2_sig),
RCI_SIGNATURE, 4)) {
pr_debug("RCI2 table init failed - incorrect signature\n");
ret = -ENODEV;
goto err_unmap;
}
rci2_table_len = *(u32 *)(rci2_base +
offsetof(struct rci2_table_global_hdr,
rci2_len));
memunmap(rci2_base);
if (!rci2_table_len) {
pr_debug("RCI2 table init failed - incorrect table length\n");
goto err;
}
rci2_base = memremap(rci2_table_phys, rci2_table_len, MEMREMAP_WB);
if (!rci2_base) {
pr_debug("RCI2 table - could not map RCI2 table\n");
goto err;
}
if (checksum() != 0) {
pr_debug("RCI2 table - incorrect checksum\n");
ret = -ENODEV;
goto err_unmap;
}
tables_kobj = kobject_create_and_add("tables", efi_kobj);
if (!tables_kobj) {
pr_debug("RCI2 table - tables_kobj creation failed\n");
goto err_unmap;
}
bin_attr_rci2.size = rci2_table_len;
bin_attr_rci2.private = rci2_base;
ret = sysfs_create_bin_file(tables_kobj, &bin_attr_rci2);
if (ret != 0) {
pr_debug("RCI2 table - rci2 sysfs bin file creation failed\n");
kobject_del(tables_kobj);
kobject_put(tables_kobj);
goto err_unmap;
}
return 0;
err_unmap:
memunmap(rci2_base);
err:
pr_debug("RCI2 table - sysfs initialization failed\n");
return ret;
}
late_initcall(efi_rci2_sysfs_init);

5
include/linux/efi.h
View file

@ -692,6 +692,9 @@ void efi_native_runtime_setup(void);
#define LINUX_EFI_TPM_FINAL_LOG_GUID EFI_GUID(0x1e2ed096, 0x30e2, 0x4254, 0xbd, 0x89, 0x86, 0x3b, 0xbe, 0xf8, 0x23, 0x25)
#define LINUX_EFI_MEMRESERVE_TABLE_GUID EFI_GUID(0x888eb0c6, 0x8ede, 0x4ff5, 0xa8, 0xf0, 0x9a, 0xee, 0x5c, 0xb9, 0x77, 0xc2)
/* OEM GUIDs */
#define DELLEMC_EFI_RCI2_TABLE_GUID EFI_GUID(0x2d9f28a2, 0xa886, 0x456a, 0x97, 0xa8, 0xf1, 0x1e, 0xf2, 0x4f, 0xf4, 0x55)
typedef struct {
efi_guid_t guid;
u64 table;
@ -1713,6 +1716,8 @@ struct efi_tcg2_final_events_table {
};
extern int efi_tpm_final_log_size;
extern unsigned long rci2_table_phys;
/*
* efi_runtime_service() function identifiers.
* "NONE" is used by efi_recover_from_page_fault() to check if the page