Merge branch 'dmi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging (f7b08217) · Commits · e / devices / android_kernel_oneplus_sm8150

Documentation/ABI/testing/sysfs-firmware-dmi→Documentation/ABI/testing/sysfs-firmware-dmi-entries

+1 −1

Original line number	Original line	Diff line number	Diff line
	What: /sys/firmware/dmi/		What: /sys/firmware/dmi/entries/
	Date: February 2011		Date: February 2011
	Contact: Mike Waychison <mikew@google.com>		Contact: Mike Waychison <mikew@google.com>
	Description:		Description:

Documentation/ABI/testing/sysfs-firmware-dmi-tables

0 → 100644

+22 −0

Original line number	Original line	Diff line number	Diff line
			What: /sys/firmware/dmi/tables/
			Date: April 2015
			Contact: Ivan Khoronzhuk <ivan.khoronzhuk@globallogic.com>
			Description:
			The firmware provides DMI structures as a packed list of
			data referenced by a SMBIOS table entry point. The SMBIOS
			entry point contains general information, like SMBIOS
			version, DMI table size, etc. The structure, content and
			size of SMBIOS entry point is dependent on SMBIOS version.
			The format of SMBIOS entry point and DMI structures
			can be read in SMBIOS specification.

			The dmi/tables provides raw SMBIOS entry point and DMI tables
			through sysfs as an alternative to utilities reading them
			from /dev/mem. The raw SMBIOS entry point and DMI table are
			presented as binary attributes and are accessible via:

			/sys/firmware/dmi/tables/smbios_entry_point
			/sys/firmware/dmi/tables/DMI

			The complete DMI information can be obtained using these two
			tables.

MAINTAINERS

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -3337,6 +3337,8 @@ F: drivers/hwmon/dme1737.c
	DMI/SMBIOS SUPPORT		DMI/SMBIOS SUPPORT
	M: Jean Delvare <jdelvare@suse.de>		M: Jean Delvare <jdelvare@suse.de>
	S: Maintained		S: Maintained
			T: quilt http://jdelvare.nerim.net/devel/linux/jdelvare-dmi/
			F: Documentation/ABI/testing/sysfs-firmware-dmi-tables
	F: drivers/firmware/dmi-id.c		F: drivers/firmware/dmi-id.c
	F: drivers/firmware/dmi_scan.c		F: drivers/firmware/dmi_scan.c
	F: include/linux/dmi.h		F: include/linux/dmi.h

drivers/firmware/dmi-sysfs.c

+8 −9

Original line number	Original line	Diff line number	Diff line
	@@ -566,7 +566,6 @@ static struct kobj_type dmi_sysfs_entry_ktype = {
	.default_attrs = dmi_sysfs_entry_attrs,		.default_attrs = dmi_sysfs_entry_attrs,
	};		};

	static struct kobject *dmi_kobj;
	static struct kset *dmi_kset;		static struct kset *dmi_kset;

	/* Global count of all instances seen. Only for setup */		/* Global count of all instances seen. Only for setup */
	@@ -648,17 +647,20 @@ static void cleanup_entry_list(void)

	static int __init dmi_sysfs_init(void)		static int __init dmi_sysfs_init(void)
	{		{
	int error = -ENOMEM;		int error;
	int val;		int val;

	/* Set up our directory */		if (!dmi_kobj) {
	dmi_kobj = kobject_create_and_add("dmi", firmware_kobj);		pr_err("dmi-sysfs: dmi entry is absent.\n");
	if (!dmi_kobj)		error = -ENODATA;
	goto err;		goto err;
			}

	dmi_kset = kset_create_and_add("entries", NULL, dmi_kobj);		dmi_kset = kset_create_and_add("entries", NULL, dmi_kobj);
	if (!dmi_kset)		if (!dmi_kset) {
			error = -ENOMEM;
	goto err;		goto err;
			}

	val = 0;		val = 0;
	error = dmi_walk(dmi_sysfs_register_handle, &val);		error = dmi_walk(dmi_sysfs_register_handle, &val);
	@@ -675,7 +677,6 @@ static int __init dmi_sysfs_init(void)
	err:		err:
	cleanup_entry_list();		cleanup_entry_list();
	kset_unregister(dmi_kset);		kset_unregister(dmi_kset);
	kobject_put(dmi_kobj);
	return error;		return error;
	}		}

	@@ -685,8 +686,6 @@ static void __exit dmi_sysfs_exit(void)
	pr_debug("dmi-sysfs: unloading.\n");		pr_debug("dmi-sysfs: unloading.\n");
	cleanup_entry_list();		cleanup_entry_list();
	kset_unregister(dmi_kset);		kset_unregister(dmi_kset);
	kobject_del(dmi_kobj);
	kobject_put(dmi_kobj);
	}		}

	module_init(dmi_sysfs_init);		module_init(dmi_sysfs_init);

drivers/firmware/dmi_scan.c

+105 −18

Original line number	Original line	Diff line number	Diff line
	@@ -10,6 +10,9 @@
	#include <asm/dmi.h>		#include <asm/dmi.h>
	#include <asm/unaligned.h>		#include <asm/unaligned.h>

			struct kobject *dmi_kobj;
			EXPORT_SYMBOL_GPL(dmi_kobj);

	/*		/*
	* DMI stands for "Desktop Management Interface". It is part		* DMI stands for "Desktop Management Interface". It is part
	* of and an antecedent to, SMBIOS, which stands for System		* of and an antecedent to, SMBIOS, which stands for System
	@@ -20,6 +23,9 @@ static const char dmi_empty_string[] = " ";
	static u32 dmi_ver __initdata;		static u32 dmi_ver __initdata;
	static u32 dmi_len;		static u32 dmi_len;
	static u16 dmi_num;		static u16 dmi_num;
			static u8 smbios_entry_point[32];
			static int smbios_entry_point_size;

	/*		/*
	* Catch too early calls to dmi_check_system():		* Catch too early calls to dmi_check_system():
	*/		*/
	@@ -80,7 +86,7 @@ static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
	* We have to be cautious here. We have seen BIOSes with DMI pointers		* We have to be cautious here. We have seen BIOSes with DMI pointers
	* pointing to completely the wrong place for example		* pointing to completely the wrong place for example
	*/		*/
	static void dmi_table(u8 *buf,		static void dmi_decode_table(u8 *buf,
	void (decode)(const struct dmi_header , void *),		void (decode)(const struct dmi_header , void *),
	void *private_data)		void *private_data)
	{		{
	@@ -89,9 +95,9 @@ static void dmi_table(u8 *buf,

	/*		/*
	* Stop when we have seen all the items the table claimed to have		* Stop when we have seen all the items the table claimed to have
	* (SMBIOS < 3.0 only) OR we reach an end-of-table marker OR we run		* (SMBIOS < 3.0 only) OR we reach an end-of-table marker (SMBIOS
	* off the end of the table (should never happen but sometimes does		* >= 3.0 only) OR we run off the end of the table (should never
	* on bogus implementations.)		* happen but sometimes does on bogus implementations.)
	*/		*/
	while ((!dmi_num \|\| i < dmi_num) &&		while ((!dmi_num \|\| i < dmi_num) &&
	(data - buf + sizeof(struct dmi_header)) <= dmi_len) {		(data - buf + sizeof(struct dmi_header)) <= dmi_len) {
	@@ -108,15 +114,24 @@ static void dmi_table(u8 *buf,
	if (data - buf < dmi_len - 1)		if (data - buf < dmi_len - 1)
	decode(dm, private_data);		decode(dm, private_data);

			data += 2;
			i++;

	/*		/*
	* 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]		* 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
			* For tables behind a 64-bit entry point, we have no item
			* count and no exact table length, so stop on end-of-table
			* marker. For tables behind a 32-bit entry point, we have
			* seen OEM structures behind the end-of-table marker on
			* some systems, so don't trust it.
	*/		*/
	if (dm->type == DMI_ENTRY_END_OF_TABLE)		if (!dmi_num && dm->type == DMI_ENTRY_END_OF_TABLE)
	break;		break;

	data += 2;
	i++;
	}		}

			/* Trim DMI table length if needed */
			if (dmi_len > data - buf)
			dmi_len = data - buf;
	}		}

	static phys_addr_t dmi_base;		static phys_addr_t dmi_base;
	@@ -125,16 +140,17 @@ static int __init dmi_walk_early(void (decode)(const struct dmi_header ,
	void *))		void *))
	{		{
	u8 *buf;		u8 *buf;
			u32 orig_dmi_len = dmi_len;

	buf = dmi_early_remap(dmi_base, dmi_len);		buf = dmi_early_remap(dmi_base, orig_dmi_len);
	if (buf == NULL)		if (buf == NULL)
	return -1;		return -1;

	dmi_table(buf, decode, NULL);		dmi_decode_table(buf, decode, NULL);

	add_device_randomness(buf, dmi_len);		add_device_randomness(buf, dmi_len);

	dmi_early_unmap(buf, dmi_len);		dmi_early_unmap(buf, orig_dmi_len);
	return 0;		return 0;
	}		}

	@@ -478,6 +494,8 @@ static int __init dmi_present(const u8 *buf)
	if (memcmp(buf, "_SM_", 4) == 0 &&		if (memcmp(buf, "_SM_", 4) == 0 &&
	buf[5] < 32 && dmi_checksum(buf, buf[5])) {		buf[5] < 32 && dmi_checksum(buf, buf[5])) {
	smbios_ver = get_unaligned_be16(buf + 6);		smbios_ver = get_unaligned_be16(buf + 6);
			smbios_entry_point_size = buf[5];
			memcpy(smbios_entry_point, buf, smbios_entry_point_size);

	/* Some BIOS report weird SMBIOS version, fix that up */		/* Some BIOS report weird SMBIOS version, fix that up */
	switch (smbios_ver) {		switch (smbios_ver) {
	@@ -512,6 +530,9 @@ static int __init dmi_present(const u8 *buf)
	pr_info("SMBIOS %d.%d present.\n",		pr_info("SMBIOS %d.%d present.\n",
	dmi_ver >> 8, dmi_ver & 0xFF);		dmi_ver >> 8, dmi_ver & 0xFF);
	} else {		} else {
			smbios_entry_point_size = 15;
			memcpy(smbios_entry_point, buf,
			smbios_entry_point_size);
	pr_info("Legacy DMI %d.%d present.\n",		pr_info("Legacy DMI %d.%d present.\n",
	dmi_ver >> 8, dmi_ver & 0xFF);		dmi_ver >> 8, dmi_ver & 0xFF);
	}		}
	@@ -533,11 +554,12 @@ static int __init dmi_smbios3_present(const u8 *buf)
	{		{
	if (memcmp(buf, "_SM3_", 5) == 0 &&		if (memcmp(buf, "_SM3_", 5) == 0 &&
	buf[6] < 32 && dmi_checksum(buf, buf[6])) {		buf[6] < 32 && dmi_checksum(buf, buf[6])) {
	dmi_ver = get_unaligned_be32(buf + 6);		dmi_ver = get_unaligned_be32(buf + 6) & 0xFFFFFF;
	dmi_ver &= 0xFFFFFF;
	dmi_num = 0; /* No longer specified */		dmi_num = 0; /* No longer specified */
	dmi_len = get_unaligned_le32(buf + 12);		dmi_len = get_unaligned_le32(buf + 12);
	dmi_base = get_unaligned_le64(buf + 16);		dmi_base = get_unaligned_le64(buf + 16);
			smbios_entry_point_size = buf[6];
			memcpy(smbios_entry_point, buf, smbios_entry_point_size);

	if (dmi_walk_early(dmi_decode) == 0) {		if (dmi_walk_early(dmi_decode) == 0) {
	pr_info("SMBIOS %d.%d.%d present.\n",		pr_info("SMBIOS %d.%d.%d present.\n",
	@@ -629,6 +651,71 @@ void __init dmi_scan_machine(void)
	dmi_initialized = 1;		dmi_initialized = 1;
	}		}

			static ssize_t raw_table_read(struct file file, struct kobject kobj,
			struct bin_attribute attr, char buf,
			loff_t pos, size_t count)
			{
			memcpy(buf, attr->private + pos, count);
			return count;
			}

			static BIN_ATTR(smbios_entry_point, S_IRUSR, raw_table_read, NULL, 0);
			static BIN_ATTR(DMI, S_IRUSR, raw_table_read, NULL, 0);

			static int __init dmi_init(void)
			{
			struct kobject *tables_kobj;
			u8 *dmi_table;
			int ret = -ENOMEM;

			if (!dmi_available) {
			ret = -ENODATA;
			goto err;
			}

			/*
			* Set up dmi directory at /sys/firmware/dmi. This entry should stay
			* even after farther error, as it can be used by other modules like
			* dmi-sysfs.
			*/
			dmi_kobj = kobject_create_and_add("dmi", firmware_kobj);
			if (!dmi_kobj)
			goto err;

			tables_kobj = kobject_create_and_add("tables", dmi_kobj);
			if (!tables_kobj)
			goto err;

			dmi_table = dmi_remap(dmi_base, dmi_len);
			if (!dmi_table)
			goto err_tables;

			bin_attr_smbios_entry_point.size = smbios_entry_point_size;
			bin_attr_smbios_entry_point.private = smbios_entry_point;
			ret = sysfs_create_bin_file(tables_kobj, &bin_attr_smbios_entry_point);
			if (ret)
			goto err_unmap;

			bin_attr_DMI.size = dmi_len;
			bin_attr_DMI.private = dmi_table;
			ret = sysfs_create_bin_file(tables_kobj, &bin_attr_DMI);
			if (!ret)
			return 0;

			sysfs_remove_bin_file(tables_kobj,
			&bin_attr_smbios_entry_point);
			err_unmap:
			dmi_unmap(dmi_table);
			err_tables:
			kobject_del(tables_kobj);
			kobject_put(tables_kobj);
			err:
			pr_err("dmi: Firmware registration failed.\n");

			return ret;
			}
			subsys_initcall(dmi_init);

	/**		/**
	* dmi_set_dump_stack_arch_desc - set arch description for dump_stack()		* dmi_set_dump_stack_arch_desc - set arch description for dump_stack()
	*		*
	@@ -897,7 +984,7 @@ int dmi_walk(void (decode)(const struct dmi_header , void *),
	if (buf == NULL)		if (buf == NULL)
	return -1;		return -1;

	dmi_table(buf, decode, private_data);		dmi_decode_table(buf, decode, private_data);

	dmi_unmap(buf);		dmi_unmap(buf);
	return 0;		return 0;