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firmware: dmi: Remember the memory type 

Store the memory type while walking the memory slots, and provide a
way to retrieve it later.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
This commit is contained in:
Jean Delvare 2019-12-03 11:20:37 +01:00
parent 219d54332a
commit 9e0afe3910
2 changed files with 26 additions and 1 deletions
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25
drivers/firmware/dmi_scan.c
View File

@ -35,6 +35,7 @@ static struct dmi_memdev_info {
const char *bank;
u64 size; /* bytes */
u16 handle;
u8 type; /* DDR2, DDR3, DDR4 etc */
} *dmi_memdev;
static int dmi_memdev_nr;
@ -391,7 +392,7 @@ static void __init save_mem_devices(const struct dmi_header *dm, void *v)
u64 bytes;
u16 size;
if (dm->type != DMI_ENTRY_MEM_DEVICE || dm->length < 0x12)
if (dm->type != DMI_ENTRY_MEM_DEVICE || dm->length < 0x13)
return;
if (nr >= dmi_memdev_nr) {
pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n");
@ -400,6 +401,7 @@ static void __init save_mem_devices(const struct dmi_header *dm, void *v)
dmi_memdev[nr].handle = get_unaligned(&dm->handle);
dmi_memdev[nr].device = dmi_string(dm, d[0x10]);
dmi_memdev[nr].bank = dmi_string(dm, d[0x11]);
dmi_memdev[nr].type = d[0x12];
size = get_unaligned((u16 *)&d[0xC]);
if (size == 0)
@ -1128,3 +1130,24 @@ u64 dmi_memdev_size(u16 handle)
return ~0ull;
}
EXPORT_SYMBOL_GPL(dmi_memdev_size);
/**
* dmi_memdev_type - get the memory type
* @handle: DMI structure handle
*
* Return the DMI memory type of the module in the slot associated with the
* given DMI handle, or 0x0 if no such DMI handle exists.
*/
u8 dmi_memdev_type(u16 handle)
{
int n;
if (dmi_memdev) {
for (n = 0; n < dmi_memdev_nr; n++) {
if (handle == dmi_memdev[n].handle)
return dmi_memdev[n].type;
}
}
return 0x0; /* Not a valid value */
}
EXPORT_SYMBOL_GPL(dmi_memdev_type);

2
include/linux/dmi.h
View File

@ -113,6 +113,7 @@ extern int dmi_walk(void (*decode)(const struct dmi_header *, void *),
extern bool dmi_match(enum dmi_field f, const char *str);
extern void dmi_memdev_name(u16 handle, const char **bank, const char **device);
extern u64 dmi_memdev_size(u16 handle);
extern u8 dmi_memdev_type(u16 handle);
#else
@ -142,6 +143,7 @@ static inline bool dmi_match(enum dmi_field f, const char *str)
static inline void dmi_memdev_name(u16 handle, const char **bank,
const char **device) { }
static inline u64 dmi_memdev_size(u16 handle) { return ~0ul; }
static inline u8 dmi_memdev_type(u16 handle) { return 0x0; }
static inline const struct dmi_system_id *
dmi_first_match(const struct dmi_system_id *list) { return NULL; }