diff options
Diffstat (limited to 'drivers/firmware/dmi_scan.c')
| -rw-r--r-- | drivers/firmware/dmi_scan.c | 573 |
1 files changed, 573 insertions, 0 deletions
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c new file mode 100644 index 0000000..8daf479 --- /dev/null +++ b/drivers/firmware/dmi_scan.c @@ -0,0 +1,573 @@ +#include <linux/types.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/dmi.h> +#include <linux/efi.h> +#include <linux/bootmem.h> +#include <linux/slab.h> +#include <asm/dmi.h> + +/* + * DMI stands for "Desktop Management Interface". It is part + * of and an antecedent to, SMBIOS, which stands for System + * Management BIOS. See further: http://www.dmtf.org/standards + */ +static char dmi_empty_string[] = " "; + +/* + * Catch too early calls to dmi_check_system(): + */ +static int dmi_initialized; + +static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s) +{ + const u8 *bp = ((u8 *) dm) + dm->length; + + if (s) { + s--; + while (s > 0 && *bp) { + bp += strlen(bp) + 1; + s--; + } + + if (*bp != 0) { + size_t len = strlen(bp)+1; + size_t cmp_len = len > 8 ? 8 : len; + + if (!memcmp(bp, dmi_empty_string, cmp_len)) + return dmi_empty_string; + return bp; + } + } + + return ""; +} + +static char * __init dmi_string(const struct dmi_header *dm, u8 s) +{ + const char *bp = dmi_string_nosave(dm, s); + char *str; + size_t len; + + if (bp == dmi_empty_string) + return dmi_empty_string; + + len = strlen(bp) + 1; + str = dmi_alloc(len); + if (str != NULL) + strcpy(str, bp); + else + printk(KERN_ERR "dmi_string: cannot allocate %Zu bytes.\n", len); + + return str; +} + +/* + * 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, int len, int num, + void (*decode)(const struct dmi_header *)) +{ + u8 *data = buf; + int i = 0; + + /* + * Stop when we see all the items the table claimed to have + * OR we run off the end of the table (also happens) + */ + while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) { + const struct dmi_header *dm = (const struct dmi_header *)data; + + /* + * We want to know the total length (formatted area and + * strings) before decoding to make sure we won't run off the + * table in dmi_decode or dmi_string + */ + data += dm->length; + while ((data - buf < len - 1) && (data[0] || data[1])) + data++; + if (data - buf < len - 1) + decode(dm); + data += 2; + i++; + } +} + +static u32 dmi_base; +static u16 dmi_len; +static u16 dmi_num; + +static int __init dmi_walk_early(void (*decode)(const struct dmi_header *)) +{ + u8 *buf; + + buf = dmi_ioremap(dmi_base, dmi_len); + if (buf == NULL) + return -1; + + dmi_table(buf, dmi_len, dmi_num, decode); + + dmi_iounmap(buf, dmi_len); + return 0; +} + +static int __init dmi_checksum(const u8 *buf) +{ + u8 sum = 0; + int a; + + for (a = 0; a < 15; a++) + sum += buf[a]; + + return sum == 0; +} + +static char *dmi_ident[DMI_STRING_MAX]; +static LIST_HEAD(dmi_devices); +int dmi_available; + +/* + * Save a DMI string + */ +static void __init dmi_save_ident(const struct dmi_header *dm, int slot, int string) +{ + const char *d = (const char*) dm; + char *p; + + if (dmi_ident[slot]) + return; + + p = dmi_string(dm, d[string]); + if (p == NULL) + return; + + dmi_ident[slot] = p; +} + +static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int index) +{ + const u8 *d = (u8*) dm + index; + char *s; + int is_ff = 1, is_00 = 1, i; + + if (dmi_ident[slot]) + return; + + for (i = 0; i < 16 && (is_ff || is_00); i++) { + if(d[i] != 0x00) is_ff = 0; + if(d[i] != 0xFF) is_00 = 0; + } + + if (is_ff || is_00) + return; + + s = dmi_alloc(16*2+4+1); + if (!s) + return; + + sprintf(s, + "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X", + d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], + d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]); + + dmi_ident[slot] = s; +} + +static void __init dmi_save_type(const struct dmi_header *dm, int slot, int index) +{ + const u8 *d = (u8*) dm + index; + char *s; + + if (dmi_ident[slot]) + return; + + s = dmi_alloc(4); + if (!s) + return; + + sprintf(s, "%u", *d & 0x7F); + dmi_ident[slot] = s; +} + +static void __init dmi_save_one_device(int type, const char *name) +{ + struct dmi_device *dev; + + /* No duplicate device */ + if (dmi_find_device(type, name, NULL)) + return; + + dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1); + if (!dev) { + printk(KERN_ERR "dmi_save_one_device: out of memory.\n"); + return; + } + + dev->type = type; + strcpy((char *)(dev + 1), name); + dev->name = (char *)(dev + 1); + dev->device_data = NULL; + list_add(&dev->list, &dmi_devices); +} + +static void __init dmi_save_devices(const struct dmi_header *dm) +{ + int i, count = (dm->length - sizeof(struct dmi_header)) / 2; + + for (i = 0; i < count; i++) { + const char *d = (char *)(dm + 1) + (i * 2); + + /* Skip disabled device */ + if ((*d & 0x80) == 0) + continue; + + dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1))); + } +} + +static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm) +{ + int i, count = *(u8 *)(dm + 1); + struct dmi_device *dev; + + for (i = 1; i <= count; i++) { + char *devname = dmi_string(dm, i); + + if (devname == dmi_empty_string) + continue; + + dev = dmi_alloc(sizeof(*dev)); + if (!dev) { + printk(KERN_ERR + "dmi_save_oem_strings_devices: out of memory.\n"); + break; + } + + dev->type = DMI_DEV_TYPE_OEM_STRING; + dev->name = devname; + dev->device_data = NULL; + + list_add(&dev->list, &dmi_devices); + } +} + +static void __init dmi_save_ipmi_device(const struct dmi_header *dm) +{ + struct dmi_device *dev; + void * data; + + data = dmi_alloc(dm->length); + if (data == NULL) { + printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n"); + return; + } + + memcpy(data, dm, dm->length); + + dev = dmi_alloc(sizeof(*dev)); + if (!dev) { + printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n"); + return; + } + + dev->type = DMI_DEV_TYPE_IPMI; + dev->name = "IPMI controller"; + dev->device_data = data; + + list_add_tail(&dev->list, &dmi_devices); +} + +static void __init dmi_save_extended_devices(const struct dmi_header *dm) +{ + const u8 *d = (u8*) dm + 5; + + /* Skip disabled device */ + if ((*d & 0x80) == 0) + return; + + dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1))); +} + +/* + * Process a DMI table entry. Right now all we care about are the BIOS + * and machine entries. For 2.5 we should pull the smbus controller info + * out of here. + */ +static void __init dmi_decode(const struct dmi_header *dm) +{ + switch(dm->type) { + case 0: /* BIOS Information */ + dmi_save_ident(dm, DMI_BIOS_VENDOR, 4); + dmi_save_ident(dm, DMI_BIOS_VERSION, 5); + dmi_save_ident(dm, DMI_BIOS_DATE, 8); + break; + case 1: /* System Information */ + dmi_save_ident(dm, DMI_SYS_VENDOR, 4); + dmi_save_ident(dm, DMI_PRODUCT_NAME, 5); + dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6); + dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7); + dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8); + break; + case 2: /* Base Board Information */ + dmi_save_ident(dm, DMI_BOARD_VENDOR, 4); + dmi_save_ident(dm, DMI_BOARD_NAME, 5); + dmi_save_ident(dm, DMI_BOARD_VERSION, 6); + dmi_save_ident(dm, DMI_BOARD_SERIAL, 7); + dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8); + break; + case 3: /* Chassis Information */ + dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4); + dmi_save_type(dm, DMI_CHASSIS_TYPE, 5); + dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6); + dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7); + dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8); + break; + case 10: /* Onboard Devices Information */ + dmi_save_devices(dm); + break; + case 11: /* OEM Strings */ + dmi_save_oem_strings_devices(dm); + break; + case 38: /* IPMI Device Information */ + dmi_save_ipmi_device(dm); + break; + case 41: /* Onboard Devices Extended Information */ + dmi_save_extended_devices(dm); + } +} + +static int __init dmi_present(const char __iomem *p) +{ + u8 buf[15]; + + memcpy_fromio(buf, p, 15); + if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) { + dmi_num = (buf[13] << 8) | buf[12]; + dmi_len = (buf[7] << 8) | buf[6]; + dmi_base = (buf[11] << 24) | (buf[10] << 16) | + (buf[9] << 8) | buf[8]; + + /* + * DMI version 0.0 means that the real version is taken from + * the SMBIOS version, which we don't know at this point. + */ + if (buf[14] != 0) + printk(KERN_INFO "DMI %d.%d present.\n", + buf[14] >> 4, buf[14] & 0xF); + else + printk(KERN_INFO "DMI present.\n"); + if (dmi_walk_early(dmi_decode) == 0) + return 0; + } + return 1; +} + +void __init dmi_scan_machine(void) +{ + char __iomem *p, *q; + int rc; + + if (efi_enabled) { + if (efi.smbios == EFI_INVALID_TABLE_ADDR) + goto error; + + /* This is called as a core_initcall() because it isn't + * needed during early boot. This also means we can + * iounmap the space when we're done with it. + */ + p = dmi_ioremap(efi.smbios, 32); + if (p == NULL) + goto error; + + rc = dmi_present(p + 0x10); /* offset of _DMI_ string */ + dmi_iounmap(p, 32); + if (!rc) { + dmi_available = 1; + goto out; + } + } + else { + /* + * no iounmap() for that ioremap(); it would be a no-op, but + * it's so early in setup that sucker gets confused into doing + * what it shouldn't if we actually call it. + */ + p = dmi_ioremap(0xF0000, 0x10000); + if (p == NULL) + goto error; + + for (q = p; q < p + 0x10000; q += 16) { + rc = dmi_present(q); + if (!rc) { + dmi_available = 1; + dmi_iounmap(p, 0x10000); + goto out; + } + } + dmi_iounmap(p, 0x10000); + } + error: + printk(KERN_INFO "DMI not present or invalid.\n"); + out: + dmi_initialized = 1; +} + +/** + * dmi_check_system - check system DMI data + * @list: array of dmi_system_id structures to match against + * All non-null elements of the list must match + * their slot's (field index's) data (i.e., each + * list string must be a substring of the specified + * DMI slot's string data) to be considered a + * successful match. + * + * Walk the blacklist table running matching functions until someone + * returns non zero or we hit the end. Callback function is called for + * each successful match. Returns the number of matches. + */ +int dmi_check_system(const struct dmi_system_id *list) +{ + int i, count = 0; + const struct dmi_system_id *d = list; + + WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n"); + + while (d->ident) { + for (i = 0; i < ARRAY_SIZE(d->matches); i++) { + int s = d->matches[i].slot; + if (s == DMI_NONE) + continue; + if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr)) + continue; + /* No match */ + goto fail; + } + count++; + if (d->callback && d->callback(d)) + break; +fail: d++; + } + + return count; +} +EXPORT_SYMBOL(dmi_check_system); + +/** + * dmi_get_system_info - return DMI data value + * @field: data index (see enum dmi_field) + * + * Returns one DMI data value, can be used to perform + * complex DMI data checks. + */ +const char *dmi_get_system_info(int field) +{ + return dmi_ident[field]; +} +EXPORT_SYMBOL(dmi_get_system_info); + + +/** + * dmi_name_in_vendors - Check if string is anywhere in the DMI vendor information. + * @str: Case sensitive Name + */ +int dmi_name_in_vendors(const char *str) +{ + static int fields[] = { DMI_BIOS_VENDOR, DMI_BIOS_VERSION, DMI_SYS_VENDOR, + DMI_PRODUCT_NAME, DMI_PRODUCT_VERSION, DMI_BOARD_VENDOR, + DMI_BOARD_NAME, DMI_BOARD_VERSION, DMI_NONE }; + int i; + for (i = 0; fields[i] != DMI_NONE; i++) { + int f = fields[i]; + if (dmi_ident[f] && strstr(dmi_ident[f], str)) + return 1; + } + return 0; +} +EXPORT_SYMBOL(dmi_name_in_vendors); + +/** + * dmi_find_device - find onboard device by type/name + * @type: device type or %DMI_DEV_TYPE_ANY to match all device types + * @name: device name string or %NULL to match all + * @from: previous device found in search, or %NULL for new search. + * + * Iterates through the list of known onboard devices. If a device is + * found with a matching @vendor and @device, a pointer to its device + * structure is returned. Otherwise, %NULL is returned. + * A new search is initiated by passing %NULL as the @from argument. + * If @from is not %NULL, searches continue from next device. + */ +const struct dmi_device * dmi_find_device(int type, const char *name, + const struct dmi_device *from) +{ + const struct list_head *head = from ? &from->list : &dmi_devices; + struct list_head *d; + + for(d = head->next; d != &dmi_devices; d = d->next) { + const struct dmi_device *dev = + list_entry(d, struct dmi_device, list); + + if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) && + ((name == NULL) || (strcmp(dev->name, name) == 0))) + return dev; + } + + return NULL; +} +EXPORT_SYMBOL(dmi_find_device); + +/** + * dmi_get_year - Return year of a DMI date + * @field: data index (like dmi_get_system_info) + * + * Returns -1 when the field doesn't exist. 0 when it is broken. + */ +int dmi_get_year(int field) +{ + int year; + const char *s = dmi_get_system_info(field); + + if (!s) + return -1; + if (*s == '\0') + return 0; + s = strrchr(s, '/'); + if (!s) + return 0; + + s += 1; + year = simple_strtoul(s, NULL, 0); + if (year && year < 100) { /* 2-digit year */ + year += 1900; + if (year < 1996) /* no dates < spec 1.0 */ + year += 100; + } + + return year; +} + +/** + * dmi_walk - Walk the DMI table and get called back for every record + * @decode: Callback function + * + * Returns -1 when the DMI table can't be reached, 0 on success. + */ +int dmi_walk(void (*decode)(const struct dmi_header *)) +{ + u8 *buf; + + if (!dmi_available) + return -1; + + buf = ioremap(dmi_base, dmi_len); + if (buf == NULL) + return -1; + + dmi_table(buf, dmi_len, dmi_num, decode); + + iounmap(buf); + return 0; +} +EXPORT_SYMBOL_GPL(dmi_walk); |
