![Shem Multinymous](/assets/img/avatar_default.png)
This teaches dmi_decode() how to decode and save OEM Strings (type 11) DMI information, which is currently discarded silently. Existing code using DMI is not affected. Follows the "System Management BIOS (SMBIOS) Specification" (http://www.dmtf.org/standards/smbios), and also the userspace dmidecode.c code. OEM Strings are the only safe way to identify some hardware, e.g., the ThinkPad embedded controller used by the soon-to-be-submitted tp_smapi driver. This will also let us eliminate the long whitelist in the mainline hdaps driver (in a future patch). Signed-off-by: Shem Multinymous <multinymous@gmail.com> Cc: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
387 lines
8.8 KiB
C
387 lines
8.8 KiB
C
#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/dmi.h>
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#include <linux/efi.h>
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#include <linux/bootmem.h>
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#include <linux/slab.h>
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#include <asm/dmi.h>
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static char * __init dmi_string(struct dmi_header *dm, u8 s)
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{
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u8 *bp = ((u8 *) dm) + dm->length;
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char *str = "";
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if (s) {
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s--;
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while (s > 0 && *bp) {
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bp += strlen(bp) + 1;
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s--;
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}
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if (*bp != 0) {
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str = dmi_alloc(strlen(bp) + 1);
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if (str != NULL)
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strcpy(str, bp);
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else
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printk(KERN_ERR "dmi_string: out of memory.\n");
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}
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}
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return str;
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}
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/*
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* We have to be cautious here. We have seen BIOSes with DMI pointers
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* pointing to completely the wrong place for example
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*/
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static int __init dmi_table(u32 base, int len, int num,
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void (*decode)(struct dmi_header *))
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{
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u8 *buf, *data;
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int i = 0;
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buf = dmi_ioremap(base, len);
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if (buf == NULL)
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return -1;
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data = buf;
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/*
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* Stop when we see all the items the table claimed to have
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* OR we run off the end of the table (also happens)
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*/
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while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
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struct dmi_header *dm = (struct dmi_header *)data;
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/*
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* We want to know the total length (formated area and strings)
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* before decoding to make sure we won't run off the table in
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* dmi_decode or dmi_string
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*/
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data += dm->length;
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while ((data - buf < len - 1) && (data[0] || data[1]))
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data++;
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if (data - buf < len - 1)
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decode(dm);
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data += 2;
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i++;
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}
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dmi_iounmap(buf, len);
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return 0;
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}
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static int __init dmi_checksum(u8 *buf)
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{
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u8 sum = 0;
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int a;
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for (a = 0; a < 15; a++)
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sum += buf[a];
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return sum == 0;
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}
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static char *dmi_ident[DMI_STRING_MAX];
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static LIST_HEAD(dmi_devices);
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/*
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* Save a DMI string
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*/
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static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string)
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{
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char *p, *d = (char*) dm;
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if (dmi_ident[slot])
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return;
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p = dmi_string(dm, d[string]);
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if (p == NULL)
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return;
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dmi_ident[slot] = p;
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}
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static void __init dmi_save_devices(struct dmi_header *dm)
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{
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int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
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struct dmi_device *dev;
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for (i = 0; i < count; i++) {
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char *d = (char *)(dm + 1) + (i * 2);
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/* Skip disabled device */
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if ((*d & 0x80) == 0)
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continue;
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dev = dmi_alloc(sizeof(*dev));
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if (!dev) {
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printk(KERN_ERR "dmi_save_devices: out of memory.\n");
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break;
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}
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dev->type = *d++ & 0x7f;
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dev->name = dmi_string(dm, *d);
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dev->device_data = NULL;
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list_add(&dev->list, &dmi_devices);
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}
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}
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static void __init dmi_save_oem_strings_devices(struct dmi_header *dm)
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{
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int i, count = *(u8 *)(dm + 1);
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struct dmi_device *dev;
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for (i = 1; i <= count; i++) {
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dev = dmi_alloc(sizeof(*dev));
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if (!dev) {
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printk(KERN_ERR
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"dmi_save_oem_strings_devices: out of memory.\n");
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break;
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}
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dev->type = DMI_DEV_TYPE_OEM_STRING;
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dev->name = dmi_string(dm, i);
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dev->device_data = NULL;
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list_add(&dev->list, &dmi_devices);
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}
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}
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static void __init dmi_save_ipmi_device(struct dmi_header *dm)
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{
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struct dmi_device *dev;
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void * data;
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data = dmi_alloc(dm->length);
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if (data == NULL) {
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printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
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return;
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}
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memcpy(data, dm, dm->length);
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dev = dmi_alloc(sizeof(*dev));
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if (!dev) {
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printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
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return;
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}
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dev->type = DMI_DEV_TYPE_IPMI;
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dev->name = "IPMI controller";
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dev->device_data = data;
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list_add(&dev->list, &dmi_devices);
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}
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/*
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* Process a DMI table entry. Right now all we care about are the BIOS
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* and machine entries. For 2.5 we should pull the smbus controller info
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* out of here.
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*/
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static void __init dmi_decode(struct dmi_header *dm)
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{
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switch(dm->type) {
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case 0: /* BIOS Information */
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dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
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dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
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dmi_save_ident(dm, DMI_BIOS_DATE, 8);
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break;
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case 1: /* System Information */
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dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
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dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
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dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
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dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
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break;
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case 2: /* Base Board Information */
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dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
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dmi_save_ident(dm, DMI_BOARD_NAME, 5);
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dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
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break;
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case 10: /* Onboard Devices Information */
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dmi_save_devices(dm);
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break;
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case 11: /* OEM Strings */
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dmi_save_oem_strings_devices(dm);
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break;
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case 38: /* IPMI Device Information */
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dmi_save_ipmi_device(dm);
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}
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}
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static int __init dmi_present(char __iomem *p)
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{
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u8 buf[15];
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memcpy_fromio(buf, p, 15);
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if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
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u16 num = (buf[13] << 8) | buf[12];
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u16 len = (buf[7] << 8) | buf[6];
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u32 base = (buf[11] << 24) | (buf[10] << 16) |
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(buf[9] << 8) | buf[8];
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/*
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* DMI version 0.0 means that the real version is taken from
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* the SMBIOS version, which we don't know at this point.
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*/
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if (buf[14] != 0)
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printk(KERN_INFO "DMI %d.%d present.\n",
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buf[14] >> 4, buf[14] & 0xF);
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else
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printk(KERN_INFO "DMI present.\n");
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if (dmi_table(base,len, num, dmi_decode) == 0)
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return 0;
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}
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return 1;
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}
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void __init dmi_scan_machine(void)
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{
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char __iomem *p, *q;
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int rc;
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if (efi_enabled) {
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if (efi.smbios == EFI_INVALID_TABLE_ADDR)
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goto out;
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/* This is called as a core_initcall() because it isn't
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* needed during early boot. This also means we can
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* iounmap the space when we're done with it.
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*/
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p = dmi_ioremap(efi.smbios, 32);
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if (p == NULL)
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goto out;
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rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
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dmi_iounmap(p, 32);
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if (!rc)
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return;
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}
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else {
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/*
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* no iounmap() for that ioremap(); it would be a no-op, but
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* it's so early in setup that sucker gets confused into doing
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* what it shouldn't if we actually call it.
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*/
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p = dmi_ioremap(0xF0000, 0x10000);
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if (p == NULL)
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goto out;
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for (q = p; q < p + 0x10000; q += 16) {
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rc = dmi_present(q);
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if (!rc)
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return;
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}
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}
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out: printk(KERN_INFO "DMI not present or invalid.\n");
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}
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/**
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* dmi_check_system - check system DMI data
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* @list: array of dmi_system_id structures to match against
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* All non-null elements of the list must match
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* their slot's (field index's) data (i.e., each
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* list string must be a substring of the specified
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* DMI slot's string data) to be considered a
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* successful match.
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*
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* Walk the blacklist table running matching functions until someone
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* returns non zero or we hit the end. Callback function is called for
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* each successful match. Returns the number of matches.
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*/
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int dmi_check_system(struct dmi_system_id *list)
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{
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int i, count = 0;
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struct dmi_system_id *d = list;
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while (d->ident) {
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for (i = 0; i < ARRAY_SIZE(d->matches); i++) {
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int s = d->matches[i].slot;
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if (s == DMI_NONE)
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continue;
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if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))
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continue;
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/* No match */
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goto fail;
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}
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count++;
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if (d->callback && d->callback(d))
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break;
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fail: d++;
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}
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return count;
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}
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EXPORT_SYMBOL(dmi_check_system);
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/**
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* dmi_get_system_info - return DMI data value
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* @field: data index (see enum dmi_field)
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*
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* Returns one DMI data value, can be used to perform
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* complex DMI data checks.
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*/
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char *dmi_get_system_info(int field)
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{
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return dmi_ident[field];
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}
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EXPORT_SYMBOL(dmi_get_system_info);
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/**
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* dmi_find_device - find onboard device by type/name
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* @type: device type or %DMI_DEV_TYPE_ANY to match all device types
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* @name: device name string or %NULL to match all
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* @from: previous device found in search, or %NULL for new search.
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*
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* Iterates through the list of known onboard devices. If a device is
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* found with a matching @vendor and @device, a pointer to its device
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* structure is returned. Otherwise, %NULL is returned.
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* A new search is initiated by passing %NULL as the @from argument.
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* If @from is not %NULL, searches continue from next device.
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*/
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struct dmi_device * dmi_find_device(int type, const char *name,
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struct dmi_device *from)
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{
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struct list_head *d, *head = from ? &from->list : &dmi_devices;
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for(d = head->next; d != &dmi_devices; d = d->next) {
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struct dmi_device *dev = list_entry(d, struct dmi_device, list);
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if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
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((name == NULL) || (strcmp(dev->name, name) == 0)))
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return dev;
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}
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return NULL;
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}
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EXPORT_SYMBOL(dmi_find_device);
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/**
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* dmi_get_year - Return year of a DMI date
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* @field: data index (like dmi_get_system_info)
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*
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* Returns -1 when the field doesn't exist. 0 when it is broken.
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*/
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int dmi_get_year(int field)
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{
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int year;
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char *s = dmi_get_system_info(field);
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if (!s)
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return -1;
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if (*s == '\0')
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return 0;
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s = strrchr(s, '/');
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if (!s)
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return 0;
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s += 1;
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year = simple_strtoul(s, NULL, 0);
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if (year && year < 100) { /* 2-digit year */
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year += 1900;
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if (year < 1996) /* no dates < spec 1.0 */
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year += 100;
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}
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return year;
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}
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