Initial import

1 files changed, 828 insertions, 0 deletions

diff --git a/drivers/firmware/iscsi_ibft.c b/drivers/firmware/iscsi_ibft.c
new file mode 100644
index 000000000..72791232e
--- /dev/null
+++ b/drivers/firmware/iscsi_ibft.c
@@ -0,0 +1,828 @@
+/*
+ *  Copyright 2007-2010 Red Hat, Inc.
+ *  by Peter Jones <pjones@redhat.com>
+ *  Copyright 2008 IBM, Inc.
+ *  by Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *  Copyright 2008
+ *  by Konrad Rzeszutek <ketuzsezr@darnok.org>
+ *
+ * This code exposes the iSCSI Boot Format Table to userland via sysfs.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License v2.0 as published by
+ * the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * Changelog:
+ *
+ *  06 Jan 2010 - Peter Jones <pjones@redhat.com>
+ *    New changelog entries are in the git log from now on.  Not here.
+ *
+ *  14 Mar 2008 - Konrad Rzeszutek <ketuzsezr@darnok.org>
+ *    Updated comments and copyrights. (v0.4.9)
+ *
+ *  11 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *    Converted to using ibft_addr. (v0.4.8)
+ *
+ *   8 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *    Combined two functions in one: reserve_ibft_region. (v0.4.7)
+ *
+ *  30 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *   Added logic to handle IPv6 addresses. (v0.4.6)
+ *
+ *  25 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *   Added logic to handle badly not-to-spec iBFT. (v0.4.5)
+ *
+ *   4 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *   Added __init to function declarations. (v0.4.4)
+ *
+ *  21 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *   Updated kobject registration, combined unregister functions in one
+ *   and code and style cleanup. (v0.4.3)
+ *
+ *   5 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *   Added end-markers to enums and re-organized kobject registration. (v0.4.2)
+ *
+ *   4 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *   Created 'device' sysfs link to the NIC and style cleanup. (v0.4.1)
+ *
+ *  28 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *   Added sysfs-ibft documentation, moved 'find_ibft' function to
+ *   in its own file and added text attributes for every struct field.  (v0.4)
+ *
+ *  21 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *   Added text attributes emulating OpenFirmware /proc/device-tree naming.
+ *   Removed binary /sysfs interface (v0.3)
+ *
+ *  29 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *   Added functionality in setup.c to reserve iBFT region. (v0.2)
+ *
+ *  27 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *   First version exposing iBFT data via a binary /sysfs. (v0.1)
+ *
+ */
+
+
+#include <linux/blkdev.h>
+#include <linux/capability.h>
+#include <linux/ctype.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/iscsi_ibft.h>
+#include <linux/limits.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/acpi.h>
+#include <linux/iscsi_boot_sysfs.h>
+
+#define IBFT_ISCSI_VERSION "0.5.0"
+#define IBFT_ISCSI_DATE "2010-Feb-25"
+
+MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and "
+	      "Konrad Rzeszutek <ketuzsezr@darnok.org>");
+MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(IBFT_ISCSI_VERSION);
+
+struct ibft_hdr {
+	u8 id;
+	u8 version;
+	u16 length;
+	u8 index;
+	u8 flags;
+} __attribute__((__packed__));
+
+struct ibft_control {
+	struct ibft_hdr hdr;
+	u16 extensions;
+	u16 initiator_off;
+	u16 nic0_off;
+	u16 tgt0_off;
+	u16 nic1_off;
+	u16 tgt1_off;
+} __attribute__((__packed__));
+
+struct ibft_initiator {
+	struct ibft_hdr hdr;
+	char isns_server[16];
+	char slp_server[16];
+	char pri_radius_server[16];
+	char sec_radius_server[16];
+	u16 initiator_name_len;
+	u16 initiator_name_off;
+} __attribute__((__packed__));
+
+struct ibft_nic {
+	struct ibft_hdr hdr;
+	char ip_addr[16];
+	u8 subnet_mask_prefix;
+	u8 origin;
+	char gateway[16];
+	char primary_dns[16];
+	char secondary_dns[16];
+	char dhcp[16];
+	u16 vlan;
+	char mac[6];
+	u16 pci_bdf;
+	u16 hostname_len;
+	u16 hostname_off;
+} __attribute__((__packed__));
+
+struct ibft_tgt {
+	struct ibft_hdr hdr;
+	char ip_addr[16];
+	u16 port;
+	char lun[8];
+	u8 chap_type;
+	u8 nic_assoc;
+	u16 tgt_name_len;
+	u16 tgt_name_off;
+	u16 chap_name_len;
+	u16 chap_name_off;
+	u16 chap_secret_len;
+	u16 chap_secret_off;
+	u16 rev_chap_name_len;
+	u16 rev_chap_name_off;
+	u16 rev_chap_secret_len;
+	u16 rev_chap_secret_off;
+} __attribute__((__packed__));
+
+/*
+ * The kobject different types and its names.
+ *
+*/
+enum ibft_id {
+	id_reserved = 0, /* We don't support. */
+	id_control = 1, /* Should show up only once and is not exported. */
+	id_initiator = 2,
+	id_nic = 3,
+	id_target = 4,
+	id_extensions = 5, /* We don't support. */
+	id_end_marker,
+};
+
+/*
+ * The kobject and attribute structures.
+ */
+
+struct ibft_kobject {
+	struct acpi_table_ibft *header;
+	union {
+		struct ibft_initiator *initiator;
+		struct ibft_nic *nic;
+		struct ibft_tgt *tgt;
+		struct ibft_hdr *hdr;
+	};
+};
+
+static struct iscsi_boot_kset *boot_kset;
+
+/* fully null address */
+static const char nulls[16];
+
+/* IPv4-mapped IPv6 ::ffff:0.0.0.0 */
+static const char mapped_nulls[16] = { 0x00, 0x00, 0x00, 0x00,
+                                       0x00, 0x00, 0x00, 0x00,
+                                       0x00, 0x00, 0xff, 0xff,
+                                       0x00, 0x00, 0x00, 0x00 };
+
+static int address_not_null(u8 *ip)
+{
+	return (memcmp(ip, nulls, 16) && memcmp(ip, mapped_nulls, 16));
+}
+
+/*
+ * Helper functions to parse data properly.
+ */
+static ssize_t sprintf_ipaddr(char *buf, u8 *ip)
+{
+	char *str = buf;
+
+	if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 &&
+	    ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 &&
+	    ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) {
+		/*
+		 * IPV4
+		 */
+		str += sprintf(buf, "%pI4", ip + 12);
+	} else {
+		/*
+		 * IPv6
+		 */
+		str += sprintf(str, "%pI6", ip);
+	}
+	str += sprintf(str, "\n");
+	return str - buf;
+}
+
+static ssize_t sprintf_string(char *str, int len, char *buf)
+{
+	return sprintf(str, "%.*s\n", len, buf);
+}
+
+/*
+ * Helper function to verify the IBFT header.
+ */
+static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length)
+{
+	if (hdr->id != id) {
+		printk(KERN_ERR "iBFT error: We expected the %s " \
+				"field header.id to have %d but " \
+				"found %d instead!\n", t, id, hdr->id);
+		return -ENODEV;
+	}
+	if (hdr->length != length) {
+		printk(KERN_ERR "iBFT error: We expected the %s " \
+				"field header.length to have %d but " \
+				"found %d instead!\n", t, length, hdr->length);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+/*
+ *  Routines for parsing the iBFT data to be human readable.
+ */
+static ssize_t ibft_attr_show_initiator(void *data, int type, char *buf)
+{
+	struct ibft_kobject *entry = data;
+	struct ibft_initiator *initiator = entry->initiator;
+	void *ibft_loc = entry->header;
+	char *str = buf;
+
+	if (!initiator)
+		return 0;
+
+	switch (type) {
+	case ISCSI_BOOT_INI_INDEX:
+		str += sprintf(str, "%d\n", initiator->hdr.index);
+		break;
+	case ISCSI_BOOT_INI_FLAGS:
+		str += sprintf(str, "%d\n", initiator->hdr.flags);
+		break;
+	case ISCSI_BOOT_INI_ISNS_SERVER:
+		str += sprintf_ipaddr(str, initiator->isns_server);
+		break;
+	case ISCSI_BOOT_INI_SLP_SERVER:
+		str += sprintf_ipaddr(str, initiator->slp_server);
+		break;
+	case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:
+		str += sprintf_ipaddr(str, initiator->pri_radius_server);
+		break;
+	case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:
+		str += sprintf_ipaddr(str, initiator->sec_radius_server);
+		break;
+	case ISCSI_BOOT_INI_INITIATOR_NAME:
+		str += sprintf_string(str, initiator->initiator_name_len,
+				      (char *)ibft_loc +
+				      initiator->initiator_name_off);
+		break;
+	default:
+		break;
+	}
+
+	return str - buf;
+}
+
+static ssize_t ibft_attr_show_nic(void *data, int type, char *buf)
+{
+	struct ibft_kobject *entry = data;
+	struct ibft_nic *nic = entry->nic;
+	void *ibft_loc = entry->header;
+	char *str = buf;
+	__be32 val;
+
+	if (!nic)
+		return 0;
+
+	switch (type) {
+	case ISCSI_BOOT_ETH_INDEX:
+		str += sprintf(str, "%d\n", nic->hdr.index);
+		break;
+	case ISCSI_BOOT_ETH_FLAGS:
+		str += sprintf(str, "%d\n", nic->hdr.flags);
+		break;
+	case ISCSI_BOOT_ETH_IP_ADDR:
+		str += sprintf_ipaddr(str, nic->ip_addr);
+		break;
+	case ISCSI_BOOT_ETH_SUBNET_MASK:
+		val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1));
+		str += sprintf(str, "%pI4", &val);
+		break;
+	case ISCSI_BOOT_ETH_ORIGIN:
+		str += sprintf(str, "%d\n", nic->origin);
+		break;
+	case ISCSI_BOOT_ETH_GATEWAY:
+		str += sprintf_ipaddr(str, nic->gateway);
+		break;
+	case ISCSI_BOOT_ETH_PRIMARY_DNS:
+		str += sprintf_ipaddr(str, nic->primary_dns);
+		break;
+	case ISCSI_BOOT_ETH_SECONDARY_DNS:
+		str += sprintf_ipaddr(str, nic->secondary_dns);
+		break;
+	case ISCSI_BOOT_ETH_DHCP:
+		str += sprintf_ipaddr(str, nic->dhcp);
+		break;
+	case ISCSI_BOOT_ETH_VLAN:
+		str += sprintf(str, "%d\n", nic->vlan);
+		break;
+	case ISCSI_BOOT_ETH_MAC:
+		str += sprintf(str, "%pM\n", nic->mac);
+		break;
+	case ISCSI_BOOT_ETH_HOSTNAME:
+		str += sprintf_string(str, nic->hostname_len,
+				      (char *)ibft_loc + nic->hostname_off);
+		break;
+	default:
+		break;
+	}
+
+	return str - buf;
+};
+
+static ssize_t ibft_attr_show_target(void *data, int type, char *buf)
+{
+	struct ibft_kobject *entry = data;
+	struct ibft_tgt *tgt = entry->tgt;
+	void *ibft_loc = entry->header;
+	char *str = buf;
+	int i;
+
+	if (!tgt)
+		return 0;
+
+	switch (type) {
+	case ISCSI_BOOT_TGT_INDEX:
+		str += sprintf(str, "%d\n", tgt->hdr.index);
+		break;
+	case ISCSI_BOOT_TGT_FLAGS:
+		str += sprintf(str, "%d\n", tgt->hdr.flags);
+		break;
+	case ISCSI_BOOT_TGT_IP_ADDR:
+		str += sprintf_ipaddr(str, tgt->ip_addr);
+		break;
+	case ISCSI_BOOT_TGT_PORT:
+		str += sprintf(str, "%d\n", tgt->port);
+		break;
+	case ISCSI_BOOT_TGT_LUN:
+		for (i = 0; i < 8; i++)
+			str += sprintf(str, "%x", (u8)tgt->lun[i]);
+		str += sprintf(str, "\n");
+		break;
+	case ISCSI_BOOT_TGT_NIC_ASSOC:
+		str += sprintf(str, "%d\n", tgt->nic_assoc);
+		break;
+	case ISCSI_BOOT_TGT_CHAP_TYPE:
+		str += sprintf(str, "%d\n", tgt->chap_type);
+		break;
+	case ISCSI_BOOT_TGT_NAME:
+		str += sprintf_string(str, tgt->tgt_name_len,
+				      (char *)ibft_loc + tgt->tgt_name_off);
+		break;
+	case ISCSI_BOOT_TGT_CHAP_NAME:
+		str += sprintf_string(str, tgt->chap_name_len,
+				      (char *)ibft_loc + tgt->chap_name_off);
+		break;
+	case ISCSI_BOOT_TGT_CHAP_SECRET:
+		str += sprintf_string(str, tgt->chap_secret_len,
+				      (char *)ibft_loc + tgt->chap_secret_off);
+		break;
+	case ISCSI_BOOT_TGT_REV_CHAP_NAME:
+		str += sprintf_string(str, tgt->rev_chap_name_len,
+				      (char *)ibft_loc +
+				      tgt->rev_chap_name_off);
+		break;
+	case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
+		str += sprintf_string(str, tgt->rev_chap_secret_len,
+				      (char *)ibft_loc +
+				      tgt->rev_chap_secret_off);
+		break;
+	default:
+		break;
+	}
+
+	return str - buf;
+}
+
+static int __init ibft_check_device(void)
+{
+	int len;
+	u8 *pos;
+	u8 csum = 0;
+
+	len = ibft_addr->header.length;
+
+	/* Sanity checking of iBFT. */
+	if (ibft_addr->header.revision != 1) {
+		printk(KERN_ERR "iBFT module supports only revision 1, " \
+				"while this is %d.\n",
+				ibft_addr->header.revision);
+		return -ENOENT;
+	}
+	for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++)
+		csum += *pos;
+
+	if (csum) {
+		printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum);
+		return -ENOENT;
+	}
+
+	return 0;
+}
+
+/*
+ * Helper routiners to check to determine if the entry is valid
+ * in the proper iBFT structure.
+ */
+static umode_t ibft_check_nic_for(void *data, int type)
+{
+	struct ibft_kobject *entry = data;
+	struct ibft_nic *nic = entry->nic;
+	umode_t rc = 0;
+
+	switch (type) {
+	case ISCSI_BOOT_ETH_INDEX:
+	case ISCSI_BOOT_ETH_FLAGS:
+		rc = S_IRUGO;
+		break;
+	case ISCSI_BOOT_ETH_IP_ADDR:
+		if (address_not_null(nic->ip_addr))
+			rc = S_IRUGO;
+		break;
+	case ISCSI_BOOT_ETH_SUBNET_MASK:
+		if (nic->subnet_mask_prefix)
+			rc = S_IRUGO;
+		break;
+	case ISCSI_BOOT_ETH_ORIGIN:
+		rc = S_IRUGO;
+		break;
+	case ISCSI_BOOT_ETH_GATEWAY:
+		if (address_not_null(nic->gateway))
+			rc = S_IRUGO;
+		break;
+	case ISCSI_BOOT_ETH_PRIMARY_DNS:
+		if (address_not_null(nic->primary_dns))
+			rc = S_IRUGO;
+		break;
+	case ISCSI_BOOT_ETH_SECONDARY_DNS:
+		if (address_not_null(nic->secondary_dns))
+			rc = S_IRUGO;
+		break;
+	case ISCSI_BOOT_ETH_DHCP:
+		if (address_not_null(nic->dhcp))
+			rc = S_IRUGO;
+		break;
+	case ISCSI_BOOT_ETH_VLAN:
+	case ISCSI_BOOT_ETH_MAC:
+		rc = S_IRUGO;
+		break;
+	case ISCSI_BOOT_ETH_HOSTNAME:
+		if (nic->hostname_off)
+			rc = S_IRUGO;
+		break;
+	default:
+		break;
+	}
+
+	return rc;
+}
+
+static umode_t __init ibft_check_tgt_for(void *data, int type)
+{
+	struct ibft_kobject *entry = data;
+	struct ibft_tgt *tgt = entry->tgt;
+	umode_t rc = 0;
+
+	switch (type) {
+	case ISCSI_BOOT_TGT_INDEX:
+	case ISCSI_BOOT_TGT_FLAGS:
+	case ISCSI_BOOT_TGT_IP_ADDR:
+	case ISCSI_BOOT_TGT_PORT:
+	case ISCSI_BOOT_TGT_LUN:
+	case ISCSI_BOOT_TGT_NIC_ASSOC:
+	case ISCSI_BOOT_TGT_CHAP_TYPE:
+		rc = S_IRUGO;
+	case ISCSI_BOOT_TGT_NAME:
+		if (tgt->tgt_name_len)
+			rc = S_IRUGO;
+		break;
+	case ISCSI_BOOT_TGT_CHAP_NAME:
+	case ISCSI_BOOT_TGT_CHAP_SECRET:
+		if (tgt->chap_name_len)
+			rc = S_IRUGO;
+		break;
+	case ISCSI_BOOT_TGT_REV_CHAP_NAME:
+	case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
+		if (tgt->rev_chap_name_len)
+			rc = S_IRUGO;
+		break;
+	default:
+		break;
+	}
+
+	return rc;
+}
+
+static umode_t __init ibft_check_initiator_for(void *data, int type)
+{
+	struct ibft_kobject *entry = data;
+	struct ibft_initiator *init = entry->initiator;
+	umode_t rc = 0;
+
+	switch (type) {
+	case ISCSI_BOOT_INI_INDEX:
+	case ISCSI_BOOT_INI_FLAGS:
+		rc = S_IRUGO;
+		break;
+	case ISCSI_BOOT_INI_ISNS_SERVER:
+		if (address_not_null(init->isns_server))
+			rc = S_IRUGO;
+		break;
+	case ISCSI_BOOT_INI_SLP_SERVER:
+		if (address_not_null(init->slp_server))
+			rc = S_IRUGO;
+		break;
+	case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:
+		if (address_not_null(init->pri_radius_server))
+			rc = S_IRUGO;
+		break;
+	case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:
+		if (address_not_null(init->sec_radius_server))
+			rc = S_IRUGO;
+		break;
+	case ISCSI_BOOT_INI_INITIATOR_NAME:
+		if (init->initiator_name_len)
+			rc = S_IRUGO;
+		break;
+	default:
+		break;
+	}
+
+	return rc;
+}
+
+static void ibft_kobj_release(void *data)
+{
+	kfree(data);
+}
+
+/*
+ * Helper function for ibft_register_kobjects.
+ */
+static int __init ibft_create_kobject(struct acpi_table_ibft *header,
+				      struct ibft_hdr *hdr)
+{
+	struct iscsi_boot_kobj *boot_kobj = NULL;
+	struct ibft_kobject *ibft_kobj = NULL;
+	struct ibft_nic *nic = (struct ibft_nic *)hdr;
+	struct pci_dev *pci_dev;
+	int rc = 0;
+
+	ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
+	if (!ibft_kobj)
+		return -ENOMEM;
+
+	ibft_kobj->header = header;
+	ibft_kobj->hdr = hdr;
+
+	switch (hdr->id) {
+	case id_initiator:
+		rc = ibft_verify_hdr("initiator", hdr, id_initiator,
+				     sizeof(*ibft_kobj->initiator));
+		if (rc)
+			break;
+
+		boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index,
+						ibft_kobj,
+						ibft_attr_show_initiator,
+						ibft_check_initiator_for,
+						ibft_kobj_release);
+		if (!boot_kobj) {
+			rc = -ENOMEM;
+			goto free_ibft_obj;
+		}
+		break;
+	case id_nic:
+		rc = ibft_verify_hdr("ethernet", hdr, id_nic,
+				     sizeof(*ibft_kobj->nic));
+		if (rc)
+			break;
+
+		boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index,
+						       ibft_kobj,
+						       ibft_attr_show_nic,
+						       ibft_check_nic_for,
+						       ibft_kobj_release);
+		if (!boot_kobj) {
+			rc = -ENOMEM;
+			goto free_ibft_obj;
+		}
+		break;
+	case id_target:
+		rc = ibft_verify_hdr("target", hdr, id_target,
+				     sizeof(*ibft_kobj->tgt));
+		if (rc)
+			break;
+
+		boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index,
+						     ibft_kobj,
+						     ibft_attr_show_target,
+						     ibft_check_tgt_for,
+						     ibft_kobj_release);
+		if (!boot_kobj) {
+			rc = -ENOMEM;
+			goto free_ibft_obj;
+		}
+		break;
+	case id_reserved:
+	case id_control:
+	case id_extensions:
+		/* Fields which we don't support. Ignore them */
+		rc = 1;
+		break;
+	default:
+		printk(KERN_ERR "iBFT has unknown structure type (%d). " \
+				"Report this bug to %.6s!\n", hdr->id,
+				header->header.oem_id);
+		rc = 1;
+		break;
+	}
+
+	if (rc) {
+		/* Skip adding this kobject, but exit with non-fatal error. */
+		rc = 0;
+		goto free_ibft_obj;
+	}
+
+	if (hdr->id == id_nic) {
+		/*
+		* We don't search for the device in other domains than
+		* zero. This is because on x86 platforms the BIOS
+		* executes only devices which are in domain 0. Furthermore, the
+		* iBFT spec doesn't have a domain id field :-(
+		*/
+		pci_dev = pci_get_bus_and_slot((nic->pci_bdf & 0xff00) >> 8,
+					       (nic->pci_bdf & 0xff));
+		if (pci_dev) {
+			rc = sysfs_create_link(&boot_kobj->kobj,
+					       &pci_dev->dev.kobj, "device");
+			pci_dev_put(pci_dev);
+		}
+	}
+	return 0;
+
+free_ibft_obj:
+	kfree(ibft_kobj);
+	return rc;
+}
+
+/*
+ * Scan the IBFT table structure for the NIC and Target fields. When
+ * found add them on the passed-in list. We do not support the other
+ * fields at this point, so they are skipped.
+ */
+static int __init ibft_register_kobjects(struct acpi_table_ibft *header)
+{
+	struct ibft_control *control = NULL;
+	void *ptr, *end;
+	int rc = 0;
+	u16 offset;
+	u16 eot_offset;
+
+	control = (void *)header + sizeof(*header);
+	end = (void *)control + control->hdr.length;
+	eot_offset = (void *)header + header->header.length - (void *)control;
+	rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control,
+			     sizeof(*control));
+
+	/* iBFT table safety checking */
+	rc |= ((control->hdr.index) ? -ENODEV : 0);
+	if (rc) {
+		printk(KERN_ERR "iBFT error: Control header is invalid!\n");
+		return rc;
+	}
+	for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) {
+		offset = *(u16 *)ptr;
+		if (offset && offset < header->header.length &&
+						offset < eot_offset) {
+			rc = ibft_create_kobject(header,
+						 (void *)header + offset);
+			if (rc)
+				break;
+		}
+	}
+
+	return rc;
+}
+
+static void ibft_unregister(void)
+{
+	struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;
+	struct ibft_kobject *ibft_kobj;
+
+	list_for_each_entry_safe(boot_kobj, tmp_kobj,
+				 &boot_kset->kobj_list, list) {
+		ibft_kobj = boot_kobj->data;
+		if (ibft_kobj->hdr->id == id_nic)
+			sysfs_remove_link(&boot_kobj->kobj, "device");
+	};
+}
+
+static void ibft_cleanup(void)
+{
+	if (boot_kset) {
+		ibft_unregister();
+		iscsi_boot_destroy_kset(boot_kset);
+	}
+}
+
+static void __exit ibft_exit(void)
+{
+	ibft_cleanup();
+}
+
+#ifdef CONFIG_ACPI
+static const struct {
+	char *sign;
+} ibft_signs[] = {
+	/*
+	 * One spec says "IBFT", the other says "iBFT". We have to check
+	 * for both.
+	 */
+	{ ACPI_SIG_IBFT },
+	{ "iBFT" },
+	{ "BIFT" },	/* Broadcom iSCSI Offload */
+};
+
+static void __init acpi_find_ibft_region(void)
+{
+	int i;
+	struct acpi_table_header *table = NULL;
+
+	if (acpi_disabled)
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) {
+		acpi_get_table(ibft_signs[i].sign, 0, &table);
+		ibft_addr = (struct acpi_table_ibft *)table;
+	}
+}
+#else
+static void __init acpi_find_ibft_region(void)
+{
+}
+#endif
+
+/*
+ * ibft_init() - creates sysfs tree entries for the iBFT data.
+ */
+static int __init ibft_init(void)
+{
+	int rc = 0;
+
+	/*
+	   As on UEFI systems the setup_arch()/find_ibft_region()
+	   is called before ACPI tables are parsed and it only does
+	   legacy finding.
+	*/
+	if (!ibft_addr)
+		acpi_find_ibft_region();
+
+	if (ibft_addr) {
+		pr_info("iBFT detected.\n");
+
+		rc = ibft_check_device();
+		if (rc)
+			return rc;
+
+		boot_kset = iscsi_boot_create_kset("ibft");
+		if (!boot_kset)
+			return -ENOMEM;
+
+		/* Scan the IBFT for data and register the kobjects. */
+		rc = ibft_register_kobjects(ibft_addr);
+		if (rc)
+			goto out_free;
+	} else
+		printk(KERN_INFO "No iBFT detected.\n");
+
+	return 0;
+
+out_free:
+	ibft_cleanup();
+	return rc;
+}
+
+module_init(ibft_init);
+module_exit(ibft_exit);