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DMI: Parse memory device (type 17) in SMBIOS

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This patch adds a new interface to decode memory device (type 17)
to help error reporting on DIMMs.

Original-author: Tony Luck <[email protected]>
Signed-off-by: Chen, Gong <[email protected]>
Acked-by: Naveen N. Rao <[email protected]>
Acked-by: Borislav Petkov <[email protected]>
Reviewed-by: Mauro Carvalho Chehab <[email protected]>
Signed-off-by: Tony Luck <[email protected]>
This commit is contained in:
Chen, Gong 2013-10-18 14:29:25 -07:00 • committed by Tony Luck
commit dd6dad4288
4 changed files with 67 additions and 0 deletions
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60
drivers/firmware/dmi_scan.c
View file

@ -25,6 +25,13 @@ static int dmi_initialized;
/* DMI system identification string used during boot */
static char dmi_ids_string[128] __initdata;
static struct dmi_memdev_info {
const char *device;
const char *bank;
u16 handle;
} *dmi_memdev;
static int dmi_memdev_nr;
static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
{
const u8 *bp = ((u8 *) dm) + dm->length;
@ -322,6 +329,42 @@ static void __init dmi_save_extended_devices(const struct dmi_header *dm)
dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1)));
}
static void __init count_mem_devices(const struct dmi_header *dm, void *v)
{
if (dm->type != DMI_ENTRY_MEM_DEVICE)
return;
dmi_memdev_nr++;
}
static void __init save_mem_devices(const struct dmi_header *dm, void *v)
{
const char *d = (const char *)dm;
static int nr;
if (dm->type != DMI_ENTRY_MEM_DEVICE)
return;
if (nr >= dmi_memdev_nr) {
pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n");
return;
}
dmi_memdev[nr].handle = dm->handle;
dmi_memdev[nr].device = dmi_string(dm, d[0x10]);
dmi_memdev[nr].bank = dmi_string(dm, d[0x11]);
nr++;
}
void __init dmi_memdev_walk(void)
{
if (!dmi_available)
return;
if (dmi_walk_early(count_mem_devices) == 0 && dmi_memdev_nr) {
dmi_memdev = dmi_alloc(sizeof(*dmi_memdev) * dmi_memdev_nr);
if (dmi_memdev)
dmi_walk_early(save_mem_devices);
}
}
/*
* 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
@ -815,3 +858,20 @@ bool dmi_match(enum dmi_field f, const char *str)
return !strcmp(info, str);
}
EXPORT_SYMBOL_GPL(dmi_match);
void dmi_memdev_name(u16 handle, const char **bank, const char **device)
{
int n;
if (dmi_memdev == NULL)
return;
for (n = 0; n < dmi_memdev_nr; n++) {
if (handle == dmi_memdev[n].handle) {
*bank = dmi_memdev[n].bank;
*device = dmi_memdev[n].device;
break;
}
}
}
EXPORT_SYMBOL_GPL(dmi_memdev_name);