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authorChen, Gong <gong.chen@linux.intel.com>2013-10-18 21:29:25 (GMT)
committerTony Luck <tony.luck@intel.com>2013-10-23 17:10:12 (GMT)
commitdd6dad4288cb93e79bd7abfa6c6a338c47454d1a (patch)
tree0e50552871a2ae86513d1a3cce21282f5002241a /drivers/firmware
parent4b3db708b114fc35ff1e0cd28a2bfb1490dbb5d3 (diff)
downloadlinux-dd6dad4288cb93e79bd7abfa6c6a338c47454d1a.tar.xz
DMI: Parse memory device (type 17) in SMBIOS
This patch adds a new interface to decode memory device (type 17) to help error reporting on DIMMs. Original-author: Tony Luck <tony.luck@intel.com> Signed-off-by: Chen, Gong <gong.chen@linux.intel.com> Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Acked-by: Borislav Petkov <bp@suse.de> Reviewed-by: Mauro Carvalho Chehab <m.chehab@samsung.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'drivers/firmware')
-rw-r--r--drivers/firmware/dmi_scan.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index fa0affb..59579a7 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -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);