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Subject[PATCH v2 5/9] DMI: Parse memory device (type 17) in SMBIOS
Date
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>
---
arch/ia64/kernel/setup.c | 1 +
arch/x86/kernel/setup.c | 1 +
drivers/firmware/dmi_scan.c | 60 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/dmi.h | 5 ++++
4 files changed, 67 insertions(+)

diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 4fc2e95..d86669b 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -1063,6 +1063,7 @@ check_bugs (void)
static int __init run_dmi_scan(void)
{
dmi_scan_machine();
+ dmi_memdev_walk();
dmi_set_dump_stack_arch_desc();
return 0;
}
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index f0de629..918d489 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -993,6 +993,7 @@ void __init setup_arch(char **cmdline_p)
efi_init();

dmi_scan_machine();
+ dmi_memdev_walk();
dmi_set_dump_stack_arch_desc();

/*
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);
diff --git a/include/linux/dmi.h b/include/linux/dmi.h
index b6eb7a0..f820f0a 100644
--- a/include/linux/dmi.h
+++ b/include/linux/dmi.h
@@ -99,6 +99,7 @@ extern const char * dmi_get_system_info(int field);
extern const struct dmi_device * dmi_find_device(int type, const char *name,
const struct dmi_device *from);
extern void dmi_scan_machine(void);
+extern void dmi_memdev_walk(void);
extern void dmi_set_dump_stack_arch_desc(void);
extern bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp);
extern int dmi_name_in_vendors(const char *str);
@@ -107,6 +108,7 @@ extern int dmi_available;
extern int dmi_walk(void (*decode)(const struct dmi_header *, void *),
void *private_data);
extern bool dmi_match(enum dmi_field f, const char *str);
+extern void dmi_memdev_name(u16 handle, const char **bank, const char **device);

#else

@@ -115,6 +117,7 @@ static inline const char * dmi_get_system_info(int field) { return NULL; }
static inline const struct dmi_device * dmi_find_device(int type, const char *name,
const struct dmi_device *from) { return NULL; }
static inline void dmi_scan_machine(void) { return; }
+static inline void dmi_memdev_walk(void) { }
static inline void dmi_set_dump_stack_arch_desc(void) { }
static inline bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
{
@@ -133,6 +136,8 @@ static inline int dmi_walk(void (*decode)(const struct dmi_header *, void *),
void *private_data) { return -1; }
static inline bool dmi_match(enum dmi_field f, const char *str)
{ return false; }
+static inline void dmi_memdev_name(u16 handle, const char **bank,
+ const char **device) { }
static inline const struct dmi_system_id *
dmi_first_match(const struct dmi_system_id *list) { return NULL; }

--
1.8.4.rc3


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