From b64185ddfb0b704f83324d8b0c6be7f7ee951581 Mon Sep 17 00:00:00 2001
From: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Date: Tue, 30 Dec 2014 02:58:12 +0200
Subject: [PATCH] firmware: dmi-sysfs: add SMBIOS entry point area attribute
Some utils, like dmidecode and smbios, needs to access SMBIOS entry
table area in order to get information like SMBIOS version, size, etc.
Currently it's done via /dev/mem. But for situation when /dev/mem
usage is disabled, the utils have to use dmi sysfs instead, which
doesn't represent SMBIOS entry. So this patch adds SMBIOS area to
dmi-sysfs in order to allow utils in question to work correctly with
dmi sysfs interface.
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
---
Documentation/ABI/testing/sysfs-firmware-dmi | 10 +++++++
drivers/firmware/dmi-sysfs.c | 42 ++++++++++++++++++++++++++++
drivers/firmware/dmi_scan.c | 26 +++++++++++++++++
include/linux/dmi.h | 3 ++
4 files changed, 81 insertions(+)
@@ -12,6 +12,16 @@ Description:
cannot ensure that the data as exported to userland is
without error either.
+ The firmware provides DMI structures as a packed list of
+ data referenced by a SMBIOS table entry point. The SMBIOS
+ entry point contains general information, like SMBIOS
+ version, DMI table size, etc. The structure, content and
+ size of SMBIOS entry point is dependent on SMBIOS version.
+ That's why SMBIOS entry point is represented in dmi sysfs
+ like a raw attribute and is accessible via
+ /sys/firmware/dmi/smbios_raw_header. The format of SMBIOS
+ entry point header can be read in SMBIOS specification.
+
DMI is structured as a large table of entries, where
each entry has a common header indicating the type and
length of the entry, as well as a firmware-provided
@@ -29,6 +29,8 @@
#define MAX_ENTRY_TYPE 255 /* Most of these aren't used, but we consider
the top entry type is only 8 bits */
+static const u8 *smbios_raw_header;
+
struct dmi_sysfs_entry {
struct dmi_header dh;
struct kobject kobj;
@@ -646,9 +648,37 @@ static void cleanup_entry_list(void)
}
}
+static ssize_t smbios_entry_area_raw_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t pos, size_t count)
+{
+ ssize_t size;
+
+ size = bin_attr->size;
+
+ if (size > pos)
+ size -= pos;
+ else
+ return 0;
+
+ if (count < size)
+ size = count;
+
+ memcpy(buf, &smbios_raw_header[pos], size);
+
+ return size;
+}
+
+static struct bin_attribute smbios_raw_area_attr = {
+ .read = smbios_entry_area_raw_read,
+ .attr = {.name = "smbios_raw_header", .mode = 0400},
+};
+
static int __init dmi_sysfs_init(void)
{
int error = -ENOMEM;
+ int size;
int val;
/* Set up our directory */
@@ -669,6 +699,18 @@ static int __init dmi_sysfs_init(void)
goto err;
}
+ smbios_raw_header = dmi_get_smbios_entry_area(&size);
+ if (!smbios_raw_header) {
+ pr_debug("dmi-sysfs: SMBIOS raw data is not available.\n");
+ error = -EINVAL;
+ goto err;
+ }
+
+ /* Create the raw binary file to access the entry area */
+ smbios_raw_area_attr.size = size;
+ if (sysfs_create_bin_file(dmi_kobj, &smbios_raw_area_attr))
+ goto err;
+
pr_debug("dmi-sysfs: loaded.\n");
return 0;
@@ -113,6 +113,8 @@ static void dmi_table(u8 *buf, int len, int num,
}
}
+static u8 smbios_header[32];
+static int smbios_header_size;
static phys_addr_t dmi_base;
static u16 dmi_len;
static u16 dmi_num;
@@ -474,6 +476,8 @@ 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_header_size = buf[5];
+ memcpy(smbios_header, buf, smbios_header_size);
/* Some BIOS report weird SMBIOS version, fix that up */
switch (smbios_ver) {
@@ -505,6 +509,8 @@ static int __init dmi_present(const u8 *buf)
pr_info("SMBIOS %d.%d present.\n",
dmi_ver >> 8, dmi_ver & 0xFF);
} else {
+ smbios_header_size = 15;
+ memcpy(smbios_header, buf, smbios_header_size);
dmi_ver = (buf[14] & 0xF0) << 4 |
(buf[14] & 0x0F);
pr_info("Legacy DMI %d.%d present.\n",
@@ -530,6 +536,8 @@ static int __init dmi_smbios3_present(const u8 *buf)
dmi_ver = get_unaligned_be16(buf + 7);
dmi_len = get_unaligned_le32(buf + 12);
dmi_base = get_unaligned_le64(buf + 16);
+ smbios_header_size = buf[6];
+ memcpy(smbios_header, buf, smbios_header_size);
/*
* The 64-bit SMBIOS 3.0 entry point no longer has a field
@@ -941,3 +949,21 @@ void dmi_memdev_name(u16 handle, const char **bank, const char **device)
}
}
EXPORT_SYMBOL_GPL(dmi_memdev_name);
+
+/**
+ * dmi_get_smbios_entry_area - copy SMBIOS entry point area to array.
+ * @size - pointer to assign actual size of SMBIOS entry point area.
+ *
+ * returns NULL if table is not available, otherwise returns pointer on
+ * SMBIOS entry point area array.
+ */
+const u8 *dmi_get_smbios_entry_area(int *size)
+{
+ if (!smbios_header_size || !dmi_available)
+ return NULL;
+
+ *size = smbios_header_size;
+
+ return smbios_header;
+}
+EXPORT_SYMBOL_GPL(dmi_get_smbios_entry_area);
@@ -109,6 +109,7 @@ extern int dmi_walk(void (*decode)(const struct dmi_header *, void *),
void *private_data);
extern bool dmi_match(enum dmi_field f, const char *str);
extern void dmi_memdev_name(u16 handle, const char **bank, const char **device);
+const u8 *dmi_get_smbios_entry_area(int *size);
#else
@@ -140,6 +141,8 @@ static inline void dmi_memdev_name(u16 handle, const char **bank,
const char **device) { }
static inline const struct dmi_system_id *
dmi_first_match(const struct dmi_system_id *list) { return NULL; }
+static inline const u8 *dmi_get_smbios_entry_area(int *size)
+ { return NULL; }
#endif
--
1.9.1