linsysfs: expose SMBIOS DMI identification

sys/compat/linsysfs/linsysfs.c

@@ -57,7 +57,22 @@ struct scsi_host_queue {
 	char *name;
 };
 
-TAILQ_HEAD(,scsi_host_queue) scsi_host_q;
+struct linsysfs_dmi_field {
+	const char *name;
+	const char *kenv;
+};
+
+static const struct linsysfs_dmi_field linsysfs_dmi_fields[] = {
+	{ "sys_vendor", "smbios.system.maker" },
+	{ "product_name", "smbios.system.product" },
+	{ "board_vendor", "smbios.planar.maker" },
+	{ "board_name", "smbios.planar.product" },
+	{ "bios_vendor", "smbios.bios.vendor" },
+	{ "bios_version", "smbios.bios.version" },
+	{ "chassis_vendor", "smbios.chassis.maker" },
+};
+
+TAILQ_HEAD(scsi_host_list, scsi_host_queue) scsi_host_q;
 
 static int host_number = 0;
 
@@ -207,6 +222,44 @@ linsysfs_listnics(struct pfs_node *dir)
 	    NULL, NULL, NULL, PFS_RD);
 }
 
+static int
+linsysfs_dmi_field(PFS_FILL_ARGS)
+{
+	const struct linsysfs_dmi_field *field;
+	char *value;
+
+	field = pn->pn_data;
+	value = kern_getenv(field->kenv);
+	if (value == NULL)
+		return (ENOENT);
+	sbuf_printf(sb, "%s\n", value);
+	freeenv(value);
+	return (0);
+}
+
+static void
+linsysfs_listdmi(struct pfs_node *class)
+{
+	struct pfs_node *dmi, *id, *node;
+	size_t i;
+
+	dmi = pfs_create_dir(class, "dmi", NULL, NULL, NULL, 0);
+	id = pfs_create_dir(dmi, "id", NULL, NULL, NULL, 0);
+	for (i = 0; i < nitems(linsysfs_dmi_fields); i++) {
+		char *value;
+
+		value = kern_getenv(linsysfs_dmi_fields[i].kenv);
+		if (value == NULL)
+			continue;
+		freeenv(value);
+		node = pfs_create_file(id, linsysfs_dmi_fields[i].name,
+		    &linsysfs_dmi_field, NULL, NULL, NULL, PFS_RD);
+		if (node != NULL)
+			node->pn_data = __DECONST(void *,
+			    &linsysfs_dmi_fields[i]);
+	}
+}
+
 /*
  * Filler function for proc_name
  */
@@ -672,6 +725,7 @@ linsysfs_init(PFS_INIT_ARGS)
 
 	linsysfs_listcpus(cpu);
 	linsysfs_listnics(net);
+	linsysfs_listdmi(class);
 
 	/* /sys/kernel */
 	kernel = pfs_create_dir(root, "kernel", NULL, NULL, NULL, 0);

tests/sys/fs/Makefile

@@ -13,6 +13,7 @@ TESTSRC=		${SRCTOP}/contrib/netbsd-tests/fs
 .if ${COMPILER_FEATURES:Mc++14} && ${MK_GOOGLETEST} != "no"
 TESTS_SUBDIRS+=		fusefs
 .endif
+TESTS_SUBDIRS+=		linsysfs
 TESTS_SUBDIRS+=		tmpfs
 
 ${PACKAGE}FILES+=	h_funcs.subr

tests/sys/fs/linsysfs/Makefile

@@ -0,0 +1,7 @@
+PACKAGE=		tests
+
+TESTSDIR=		${TESTSBASE}/sys/fs/linsysfs
+
+ATF_TESTS_SH+=		dmi_id_test
+
+.include <bsd.test.mk>

tests/sys/fs/linsysfs/dmi_id_test.sh

@@ -0,0 +1,67 @@
+#!/bin/sh
+
+atf_test_case dmi_id cleanup
+dmi_id_head()
+{
+	atf_set "descr" "Verify Linux-compatible DMI identification files"
+	atf_set "require.user" "root"
+}
+
+dmi_id_body()
+{
+	atf_require_prog kenv
+	atf_require_prog kldload
+	atf_require_prog kldstat
+	atf_require_prog mount
+	atf_require_prog stat
+	atf_require_prog umount
+
+	if ! kldstat -q -m linsysfs; then
+		atf_check -s exit:0 kldload linsysfs
+		touch linsysfs_loaded
+	fi
+
+	mkdir mnt
+	atf_check -s exit:0 mount -t linsysfs linsysfs "$(pwd)/mnt"
+	touch linsysfs_mounted
+
+	found=0
+	while read -r name key; do
+		if value=$(kenv "${key}" 2>/dev/null); then
+			found=1
+			atf_check -s exit:0 -o inline:"${value}\n" \
+			    cat "mnt/class/dmi/id/${name}"
+			atf_check -s exit:0 -o inline:"444\n" \
+			    stat -f '%Lp' "mnt/class/dmi/id/${name}"
+		elif [ -e "mnt/class/dmi/id/${name}" ]; then
+			atf_fail "${name} exists without ${key}"
+		fi
+	done <<-EOF
+	sys_vendor smbios.system.maker
+	product_name smbios.system.product
+	board_vendor smbios.planar.maker
+	board_name smbios.planar.product
+	bios_vendor smbios.bios.vendor
+	bios_version smbios.bios.version
+	chassis_vendor smbios.chassis.maker
+	EOF
+
+	if [ "${found}" -eq 0 ]; then
+		atf_skip "no SMBIOS identification values are available"
+	fi
+}
+
+dmi_id_cleanup()
+{
+	if [ -f linsysfs_mounted ]; then
+		umount "$(pwd)/mnt" >/dev/null 2>&1 || true
+	fi
+	if [ -f linsysfs_loaded ]; then
+		kldunload linsysfs >/dev/null 2>&1 || true
+	fi
+}
+
+atf_init_test_cases()
+{
+	atf_add_test_case dmi_id
+}