diff options
| -rw-r--r-- | Documentation/ABI/testing/sysfs-firmware-dmi-entries (renamed from Documentation/ABI/testing/sysfs-firmware-dmi) | 2 | ||||
| -rw-r--r-- | Documentation/ABI/testing/sysfs-firmware-dmi-tables | 22 | ||||
| -rw-r--r-- | MAINTAINERS | 2 | ||||
| -rw-r--r-- | drivers/firmware/dmi-sysfs.c | 17 | ||||
| -rw-r--r-- | drivers/firmware/dmi_scan.c | 123 | ||||
| -rw-r--r-- | include/linux/dmi.h | 4 |
6 files changed, 141 insertions, 29 deletions
diff --git a/Documentation/ABI/testing/sysfs-firmware-dmi b/Documentation/ABI/testing/sysfs-firmware-dmi-entries index c78f9ab01e56..210ad44b95a5 100644 --- a/Documentation/ABI/testing/sysfs-firmware-dmi +++ b/Documentation/ABI/testing/sysfs-firmware-dmi-entries @@ -1,4 +1,4 @@ -What: /sys/firmware/dmi/ +What: /sys/firmware/dmi/entries/ Date: February 2011 Contact: Mike Waychison <mikew@google.com> Description: diff --git a/Documentation/ABI/testing/sysfs-firmware-dmi-tables b/Documentation/ABI/testing/sysfs-firmware-dmi-tables new file mode 100644 index 000000000000..ff3cac8ed0bd --- /dev/null +++ b/Documentation/ABI/testing/sysfs-firmware-dmi-tables @@ -0,0 +1,22 @@ +What: /sys/firmware/dmi/tables/ +Date: April 2015 +Contact: Ivan Khoronzhuk <ivan.khoronzhuk@globallogic.com> +Description: + 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. + The format of SMBIOS entry point and DMI structures + can be read in SMBIOS specification. + + The dmi/tables provides raw SMBIOS entry point and DMI tables + through sysfs as an alternative to utilities reading them + from /dev/mem. The raw SMBIOS entry point and DMI table are + presented as binary attributes and are accessible via: + + /sys/firmware/dmi/tables/smbios_entry_point + /sys/firmware/dmi/tables/DMI + + The complete DMI information can be obtained using these two + tables. diff --git a/MAINTAINERS b/MAINTAINERS index 73cfd4b0f539..25916c00d7a3 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3337,6 +3337,8 @@ F: drivers/hwmon/dme1737.c DMI/SMBIOS SUPPORT M: Jean Delvare <jdelvare@suse.de> S: Maintained +T: quilt http://jdelvare.nerim.net/devel/linux/jdelvare-dmi/ +F: Documentation/ABI/testing/sysfs-firmware-dmi-tables F: drivers/firmware/dmi-id.c F: drivers/firmware/dmi_scan.c F: include/linux/dmi.h diff --git a/drivers/firmware/dmi-sysfs.c b/drivers/firmware/dmi-sysfs.c index e0f1cb3d3598..ef76e5eecf0b 100644 --- a/drivers/firmware/dmi-sysfs.c +++ b/drivers/firmware/dmi-sysfs.c @@ -566,7 +566,6 @@ static struct kobj_type dmi_sysfs_entry_ktype = { .default_attrs = dmi_sysfs_entry_attrs, }; -static struct kobject *dmi_kobj; static struct kset *dmi_kset; /* Global count of all instances seen. Only for setup */ @@ -648,17 +647,20 @@ static void cleanup_entry_list(void) static int __init dmi_sysfs_init(void) { - int error = -ENOMEM; + int error; int val; - /* Set up our directory */ - dmi_kobj = kobject_create_and_add("dmi", firmware_kobj); - if (!dmi_kobj) + if (!dmi_kobj) { + pr_err("dmi-sysfs: dmi entry is absent.\n"); + error = -ENODATA; goto err; + } dmi_kset = kset_create_and_add("entries", NULL, dmi_kobj); - if (!dmi_kset) + if (!dmi_kset) { + error = -ENOMEM; goto err; + } val = 0; error = dmi_walk(dmi_sysfs_register_handle, &val); @@ -675,7 +677,6 @@ static int __init dmi_sysfs_init(void) err: cleanup_entry_list(); kset_unregister(dmi_kset); - kobject_put(dmi_kobj); return error; } @@ -685,8 +686,6 @@ static void __exit dmi_sysfs_exit(void) pr_debug("dmi-sysfs: unloading.\n"); cleanup_entry_list(); kset_unregister(dmi_kset); - kobject_del(dmi_kobj); - kobject_put(dmi_kobj); } module_init(dmi_sysfs_init); 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; diff --git a/include/linux/dmi.h b/include/linux/dmi.h index f820f0a336c9..5055ac34142d 100644 --- a/include/linux/dmi.h +++ b/include/linux/dmi.h @@ -2,6 +2,7 @@ #define __DMI_H__ #include <linux/list.h> +#include <linux/kobject.h> #include <linux/mod_devicetable.h> /* enum dmi_field is in mod_devicetable.h */ @@ -74,7 +75,7 @@ struct dmi_header { u8 type; u8 length; u16 handle; -}; +} __packed; struct dmi_device { struct list_head list; @@ -93,6 +94,7 @@ struct dmi_dev_onboard { int devfn; }; +extern struct kobject *dmi_kobj; extern int dmi_check_system(const struct dmi_system_id *list); const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list); extern const char * dmi_get_system_info(int field); |