Commit 9e0afe39 authored by Jean Delvare's avatar Jean Delvare
Browse files

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: default avatarJean Delvare <jdelvare@suse.de>
parent 219d5433

drivers/firmware/dmi_scan.c

+24 −1
Original line number Diff line number Diff line
@@ -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);

include/linux/dmi.h

+2 −0
Original line number Diff line number Diff line
@@ -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; }