Firmware: add iSCSI iBFT Support

Add /sysfs/firmware/ibft/[initiator|targetX|ethernetX] directories along with
text properties which export the the iSCSI Boot Firmware Table (iBFT)
structure.

What is iSCSI Boot Firmware Table?  It is a mechanism for the iSCSI tools to
extract from the machine NICs the iSCSI connection information so that they
can automagically mount the iSCSI share/target.  Currently the iSCSI
information is hard-coded in the initrd.  The /sysfs entries are read-only
one-name-and-value fields.

The usual set of data exposed is:

# for a in `find /sys/firmware/ibft/ -type f -print`; do  echo -n "$a: ";  cat $a; done
/sys/firmware/ibft/target0/target-name: iqn.2007.com.intel-sbx44:storage-10gb
/sys/firmware/ibft/target0/nic-assoc: 0
/sys/firmware/ibft/target0/chap-type: 0
/sys/firmware/ibft/target0/lun: 00000000
/sys/firmware/ibft/target0/port: 3260
/sys/firmware/ibft/target0/ip-addr: 192.168.79.116
/sys/firmware/ibft/target0/flags: 3
/sys/firmware/ibft/target0/index: 0
/sys/firmware/ibft/ethernet0/mac: 00:11:25:9d:8b:01
/sys/firmware/ibft/ethernet0/vlan: 0
/sys/firmware/ibft/ethernet0/gateway: 192.168.79.254
/sys/firmware/ibft/ethernet0/origin: 0
/sys/firmware/ibft/ethernet0/subnet-mask: 255.255.252.0
/sys/firmware/ibft/ethernet0/ip-addr: 192.168.77.41
/sys/firmware/ibft/ethernet0/flags: 7
/sys/firmware/ibft/ethernet0/index: 0
/sys/firmware/ibft/initiator/initiator-name: iqn.2007-07.com:konrad.initiator
/sys/firmware/ibft/initiator/flags: 3
/sys/firmware/ibft/initiator/index: 0

For full details of the IBFT structure please take a look at:
ftp://ftp.software.ibm.com/systems/support/system_x_pdf/ibm_iscsi_boot_firmware_table_v1.02.pdf

[akpm@linux-foundation.org: fix build]
Signed-off-by: Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
Cc: Mike Christie <michaelc@cs.wisc.edu>
Cc: Peter Jones <pjones@redhat.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

8 files changed, 1168 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-ibft b/Documentation/ABI/testing/sysfs-ibft
new file mode 100644
index 000000000000..c2b7d1154bec
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-ibft
@@ -0,0 +1,23 @@
+What:           /sys/firmware/ibft/initiator
+Date:           November 2007
+Contact:        Konrad Rzeszutek <ketuzsezr@darnok.org>
+Description:    The /sys/firmware/ibft/initiator directory will contain
+                files that expose the iSCSI Boot Firmware Table initiator data.
+                Usually this contains the Initiator name.
+
+What:           /sys/firmware/ibft/targetX
+Date:           November 2007
+Contact:        Konrad Rzeszutek <ketuzsezr@darnok.org>
+Description:    The /sys/firmware/ibft/targetX directory will contain
+                files that expose the iSCSI Boot Firmware Table target data.
+                Usually this contains the target's IP address, boot LUN,
+                target name, and what NIC it is associated with. It can also
+                contain the CHAP name (and password), the reverse CHAP
+                name (and password)
+
+What:           /sys/firmware/ibft/ethernetX
+Date:           November 2007
+Contact:        Konrad Rzeszutek <ketuzsezr@darnok.org>
+Description:    The /sys/firmware/ibft/ethernetX directory will contain
+                files that expose the iSCSI Boot Firmware Table NIC data.
+                This can this can the IP address, MAC, and gateway of the NIC.
diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c
index 5b0bffb7fcc9..4ef91749959e 100644
--- a/arch/x86/kernel/setup_32.c
+++ b/arch/x86/kernel/setup_32.c
@@ -39,6 +39,7 @@
 #include <linux/efi.h>
 #include <linux/init.h>
 #include <linux/edd.h>
+#include <linux/iscsi_ibft.h>
 #include <linux/nodemask.h>
 #include <linux/kexec.h>
 #include <linux/crash_dump.h>
@@ -689,6 +690,8 @@ void __init setup_bootmem_allocator(void)
 #endif
         numa_kva_reserve();
         reserve_crashkernel();
+
+        reserve_ibft_region();
 }
 
 /*
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index 674ef3510cdf..216c93bd9993 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -33,6 +33,7 @@
 #include <linux/acpi.h>
 #include <linux/kallsyms.h>
 #include <linux/edd.h>
+#include <linux/iscsi_ibft.h>
 #include <linux/mmzone.h>
 #include <linux/kexec.h>
 #include <linux/cpufreq.h>
@@ -434,6 +435,9 @@ void __init setup_arch(char **cmdline_p)
         }
 #endif
         reserve_crashkernel();
+
+        reserve_ibft_region();
+
         paging_init();
         map_vsyscall();
 
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 05f02a326f1c..40ffd767647d 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -93,4 +93,24 @@ config DMIID
           information from userspace through /sys/class/dmi/id/ or if you want
           DMI-based module auto-loading.
 
+config ISCSI_IBFT_FIND
+        bool "iSCSI Boot Firmware Table Attributes"
+        depends on X86
+        default n
+        help
+          This option enables the kernel to find the region of memory
+          in which the ISCSI Boot Firmware Table (iBFT) resides. This
+          is necessary for iSCSI Boot Firmware Table Attributes module to work
+          properly.
+
+config ISCSI_IBFT
+        tristate "iSCSI Boot Firmware Table Attributes module"
+        depends on ISCSI_IBFT_FIND
+        default n
+        help
+          This option enables support for detection and exposing of iSCSI
+          Boot Firmware Table (iBFT) via sysfs to userspace. If you wish to
+          detect iSCSI boot parameters dynamically during system boot, say Y.
+          Otherwise, say N.
+
 endmenu
diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile
index 8d4ebc805a50..4c9147154df8 100644
--- a/drivers/firmware/Makefile
+++ b/drivers/firmware/Makefile
@@ -8,3 +8,5 @@ obj-$(CONFIG_EFI_PCDP)		+= pcdp.o
 obj-$(CONFIG_DELL_RBU)          += dell_rbu.o
 obj-$(CONFIG_DCDBAS)            += dcdbas.o
 obj-$(CONFIG_DMIID)             += dmi-id.o
+obj-$(CONFIG_ISCSI_IBFT_FIND)   += iscsi_ibft_find.o
+obj-$(CONFIG_ISCSI_IBFT)        += iscsi_ibft.o
diff --git a/drivers/firmware/iscsi_ibft.c b/drivers/firmware/iscsi_ibft.c
new file mode 100644
index 000000000000..8024e3bfd877
--- /dev/null
+++ b/drivers/firmware/iscsi_ibft.c
@@ -0,0 +1,982 @@
+/*
+ *  Copyright 2007 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:
+ *
+ *  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>
+
+#define IBFT_ISCSI_VERSION "0.4.9"
+#define IBFT_ISCSI_DATE "2008-Mar-14"
+
+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,
+};
+
+/*
+ * We do not support the other types, hence the usage of NULL.
+ * This maps to the enum ibft_id.
+ */
+static const char *ibft_id_names[] =
+        {NULL, NULL, "initiator", "ethernet%d", "target%d", NULL, NULL};
+
+/*
+ * The text attributes names for each of the kobjects.
+*/
+enum ibft_eth_properties_enum {
+        ibft_eth_index,
+        ibft_eth_flags,
+        ibft_eth_ip_addr,
+        ibft_eth_subnet_mask,
+        ibft_eth_origin,
+        ibft_eth_gateway,
+        ibft_eth_primary_dns,
+        ibft_eth_secondary_dns,
+        ibft_eth_dhcp,
+        ibft_eth_vlan,
+        ibft_eth_mac,
+        /* ibft_eth_pci_bdf - this is replaced by link to the device itself. */
+        ibft_eth_hostname,
+        ibft_eth_end_marker,
+};
+
+static const char *ibft_eth_properties[] =
+        {"index", "flags", "ip-addr", "subnet-mask", "origin", "gateway",
+        "primary-dns", "secondary-dns", "dhcp", "vlan", "mac", "hostname",
+        NULL};
+
+enum ibft_tgt_properties_enum {
+        ibft_tgt_index,
+        ibft_tgt_flags,
+        ibft_tgt_ip_addr,
+        ibft_tgt_port,
+        ibft_tgt_lun,
+        ibft_tgt_chap_type,
+        ibft_tgt_nic_assoc,
+        ibft_tgt_name,
+        ibft_tgt_chap_name,
+        ibft_tgt_chap_secret,
+        ibft_tgt_rev_chap_name,
+        ibft_tgt_rev_chap_secret,
+        ibft_tgt_end_marker,
+};
+
+static const char *ibft_tgt_properties[] =
+        {"index", "flags", "ip-addr", "port", "lun", "chap-type", "nic-assoc",
+        "target-name", "chap-name", "chap-secret", "rev-chap-name",
+        "rev-chap-name-secret", NULL};
+
+enum ibft_initiator_properties_enum {
+        ibft_init_index,
+        ibft_init_flags,
+        ibft_init_isns_server,
+        ibft_init_slp_server,
+        ibft_init_pri_radius_server,
+        ibft_init_sec_radius_server,
+        ibft_init_initiator_name,
+        ibft_init_end_marker,
+};
+
+static const char *ibft_initiator_properties[] =
+        {"index", "flags", "isns-server", "slp-server", "pri-radius-server",
+        "sec-radius-server", "initiator-name", NULL};
+
+/*
+ * The kobject and attribute structures.
+ */
+
+struct ibft_kobject {
+        struct ibft_table_header *header;
+        union {
+                struct ibft_initiator *initiator;
+                struct ibft_nic *nic;
+                struct ibft_tgt *tgt;
+                struct ibft_hdr *hdr;
+        };
+        struct kobject kobj;
+        struct list_head node;
+};
+
+struct ibft_attribute {
+        struct attribute attr;
+        ssize_t (*show) (struct  ibft_kobject *entry,
+                         struct ibft_attribute *attr, char *buf);
+        union {
+                struct ibft_initiator *initiator;
+                struct ibft_nic *nic;
+                struct ibft_tgt *tgt;
+                struct ibft_hdr *hdr;
+        };
+        struct kobject *kobj;
+        int type; /* The enum of the type. This can be any value of:
+                ibft_eth_properties_enum, ibft_tgt_properties_enum,
+                or ibft_initiator_properties_enum. */
+        struct list_head node;
+};
+
+static LIST_HEAD(ibft_attr_list);
+static LIST_HEAD(ibft_kobject_list);
+
+static const char 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, NIPQUAD_FMT, ip[12],
+                               ip[13], ip[14], ip[15]);
+        } else {
+                /*
+                 * IPv6
+                 */
+                str += sprintf(str, NIP6_FMT, ntohs(ip[0]), ntohs(ip[1]),
+                               ntohs(ip[2]), ntohs(ip[3]), ntohs(ip[4]),
+                               ntohs(ip[5]), ntohs(ip[6]), ntohs(ip[7]));
+        }
+        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 " \
+                                "field header.id to have %d but " \
+                                "found %d instead!\n", id, hdr->id);
+                return -ENODEV;
+        }
+        if (hdr->length != length) {
+                printk(KERN_ERR "iBFT error: We expected the " \
+                                "field header.length to have %d but " \
+                                "found %d instead!\n", length, hdr->length);
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+static void ibft_release(struct kobject *kobj)
+{
+        struct ibft_kobject *ibft =
+                container_of(kobj, struct ibft_kobject, kobj);
+        kfree(ibft);
+}
+
+/*
+ *  Routines for parsing the iBFT data to be human readable.
+ */
+ssize_t ibft_attr_show_initiator(struct ibft_kobject *entry,
+                                  struct ibft_attribute *attr,
+                                  char *buf)
+{
+        struct ibft_initiator *initiator = entry->initiator;
+        void *ibft_loc = entry->header;
+        char *str = buf;
+
+        if (!initiator)
+                return 0;
+
+        switch (attr->type) {
+        case ibft_init_index:
+                str += sprintf(str, "%d\n", initiator->hdr.index);
+                break;
+        case ibft_init_flags:
+                str += sprintf(str, "%d\n", initiator->hdr.flags);
+                break;
+        case ibft_init_isns_server:
+                str += sprintf_ipaddr(str, initiator->isns_server);
+                break;
+        case ibft_init_slp_server:
+                str += sprintf_ipaddr(str, initiator->slp_server);
+                break;
+        case ibft_init_pri_radius_server:
+                str += sprintf_ipaddr(str, initiator->pri_radius_server);
+                break;
+        case ibft_init_sec_radius_server:
+                str += sprintf_ipaddr(str, initiator->sec_radius_server);
+                break;
+        case ibft_init_initiator_name:
+                str += sprintf_string(str, initiator->initiator_name_len,
+                                      (char *)ibft_loc +
+                                      initiator->initiator_name_off);
+                break;
+        default:
+                break;
+        }
+
+        return str - buf;
+}
+
+ssize_t ibft_attr_show_nic(struct ibft_kobject *entry,
+                            struct ibft_attribute *attr,
+                            char *buf)
+{
+        struct ibft_nic *nic = entry->nic;
+        void *ibft_loc = entry->header;
+        char *str = buf;
+        char *mac;
+        int val;
+
+        if (!nic)
+                return 0;
+
+        switch (attr->type) {
+        case ibft_eth_index:
+                str += sprintf(str, "%d\n", nic->hdr.index);
+                break;
+        case ibft_eth_flags:
+                str += sprintf(str, "%d\n", nic->hdr.flags);
+                break;
+        case ibft_eth_ip_addr:
+                str += sprintf_ipaddr(str, nic->ip_addr);
+                break;
+        case ibft_eth_subnet_mask:
+                val = ~((1 << (32-nic->subnet_mask_prefix))-1);
+                str += sprintf(str, NIPQUAD_FMT,
+                               (u8)(val >> 24), (u8)(val >> 16),
+                               (u8)(val >> 8), (u8)(val));
+                break;
+        case ibft_eth_origin:
+                str += sprintf(str, "%d\n", nic->origin);
+                break;
+        case ibft_eth_gateway:
+                str += sprintf_ipaddr(str, nic->gateway);
+                break;
+        case ibft_eth_primary_dns:
+                str += sprintf_ipaddr(str, nic->primary_dns);
+                break;
+        case ibft_eth_secondary_dns:
+                str += sprintf_ipaddr(str, nic->secondary_dns);
+                break;
+        case ibft_eth_dhcp:
+                str += sprintf_ipaddr(str, nic->dhcp);
+                break;
+        case ibft_eth_vlan:
+                str += sprintf(str, "%d\n", nic->vlan);
+                break;
+        case ibft_eth_mac:
+                mac = nic->mac;
+                str += sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x\n",
+                               (u8)mac[0], (u8)mac[1], (u8)mac[2],
+                               (u8)mac[3], (u8)mac[4], (u8)mac[5]);
+                break;
+        case ibft_eth_hostname:
+                str += sprintf_string(str, nic->hostname_len,
+                                      (char *)ibft_loc + nic->hostname_off);
+                break;
+        default:
+                break;
+        }
+
+        return str - buf;
+};
+
+ssize_t ibft_attr_show_target(struct ibft_kobject *entry,
+                               struct ibft_attribute *attr,
+                               char *buf)
+{
+        struct ibft_tgt *tgt = entry->tgt;
+        void *ibft_loc = entry->header;
+        char *str = buf;
+        int i;
+
+        if (!tgt)
+                return 0;
+
+        switch (attr->type) {
+        case ibft_tgt_index:
+                str += sprintf(str, "%d\n", tgt->hdr.index);
+                break;
+        case ibft_tgt_flags:
+                str += sprintf(str, "%d\n", tgt->hdr.flags);
+                break;
+        case ibft_tgt_ip_addr:
+                str += sprintf_ipaddr(str, tgt->ip_addr);
+                break;
+        case ibft_tgt_port:
+                str += sprintf(str, "%d\n", tgt->port);
+                break;
+        case ibft_tgt_lun:
+                for (i = 0; i < 8; i++)
+                        str += sprintf(str, "%x", (u8)tgt->lun[i]);
+                str += sprintf(str, "\n");
+                break;
+        case ibft_tgt_nic_assoc:
+                str += sprintf(str, "%d\n", tgt->nic_assoc);
+                break;
+        case ibft_tgt_chap_type:
+                str += sprintf(str, "%d\n", tgt->chap_type);
+                break;
+        case ibft_tgt_name:
+                str += sprintf_string(str, tgt->tgt_name_len,
+                                      (char *)ibft_loc + tgt->tgt_name_off);
+                break;
+        case ibft_tgt_chap_name:
+                str += sprintf_string(str, tgt->chap_name_len,
+                                      (char *)ibft_loc + tgt->chap_name_off);
+                break;
+        case ibft_tgt_chap_secret:
+                str += sprintf_string(str, tgt->chap_secret_len,
+                                      (char *)ibft_loc + tgt->chap_secret_off);
+                break;
+        case ibft_tgt_rev_chap_name:
+                str += sprintf_string(str, tgt->rev_chap_name_len,
+                                      (char *)ibft_loc +
+                                      tgt->rev_chap_name_off);
+                break;
+        case ibft_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;
+}
+
+/*
+ * The routine called for all sysfs attributes.
+ */
+static ssize_t ibft_show_attribute(struct kobject *kobj,
+                                    struct attribute *attr,
+                                    char *buf)
+{
+        struct ibft_kobject *dev =
+                container_of(kobj, struct ibft_kobject, kobj);
+        struct ibft_attribute *ibft_attr =
+                container_of(attr, struct ibft_attribute, attr);
+        ssize_t ret = -EIO;
+        char *str = buf;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EACCES;
+
+        if (ibft_attr->show)
+                ret = ibft_attr->show(dev, ibft_attr, str);
+
+        return ret;
+}
+
+static struct sysfs_ops ibft_attr_ops = {
+        .show = ibft_show_attribute,
+};
+
+static struct kobj_type ibft_ktype = {
+        .release = ibft_release,
+        .sysfs_ops = &ibft_attr_ops,
+};
+
+static struct kset *ibft_kset;
+
+static int __init ibft_check_device(void)
+{
+        int len;
+        u8 *pos;
+        u8 csum = 0;
+
+        len = ibft_addr->length;
+
+        /* Sanity checking of iBFT. */
+        if (ibft_addr->revision != 1) {
+                printk(KERN_ERR "iBFT module supports only revision 1, " \
+                                "while this is %d.\n", ibft_addr->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 function for ibft_register_kobjects.
+ */
+static int __init ibft_create_kobject(struct ibft_table_header *header,
+                                       struct ibft_hdr *hdr,
+                                       struct list_head *list)
+{
+        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));
+                break;
+        case id_nic:
+                rc = ibft_verify_hdr("ethernet", hdr, id_nic,
+                                     sizeof(*ibft_kobj->nic));
+                break;
+        case id_target:
+                rc = ibft_verify_hdr("target", hdr, id_target,
+                                     sizeof(*ibft_kobj->tgt));
+                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->oem_id);
+                rc = 1;
+                break;
+        }
+
+        if (rc) {
+                /* Skip adding this kobject, but exit with non-fatal error. */
+                kfree(ibft_kobj);
+                goto out_invalid_struct;
+        }
+
+        ibft_kobj->kobj.kset = ibft_kset;
+
+        rc = kobject_init_and_add(&ibft_kobj->kobj, &ibft_ktype,
+                                  NULL, ibft_id_names[hdr->id], hdr->index);
+
+        if (rc) {
+                kfree(ibft_kobj);
+                goto out;
+        }
+
+        kobject_uevent(&ibft_kobj->kobj, KOBJ_ADD);
+
+        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(&ibft_kobj->kobj,
+                                               &pci_dev->dev.kobj, "device");
+                        pci_dev_put(pci_dev);
+                }
+        }
+
+        /* Nothing broke so lets add it to the list. */
+        list_add_tail(&ibft_kobj->node, list);
+out:
+        return rc;
+out_invalid_struct:
+        /* Unsupported structs are skipped. */
+        return 0;
+}
+
+/*
+ * 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 ibft_table_header *header,
+                                          struct list_head *list)
+{
+        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->length -
+                     (void *)control - sizeof(*header);
+        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->length && offset < eot_offset) {
+                        rc = ibft_create_kobject(header,
+                                                 (void *)header + offset,
+                                                 list);
+                        if (rc)
+                                break;
+                }
+        }
+
+        return rc;
+}
+
+static void ibft_unregister(struct list_head *attr_list,
+                             struct list_head *kobj_list)
+{
+        struct ibft_kobject *data = NULL, *n;
+        struct ibft_attribute *attr = NULL, *m;
+
+        list_for_each_entry_safe(attr, m, attr_list, node) {
+                sysfs_remove_file(attr->kobj, &attr->attr);
+                list_del(&attr->node);
+                kfree(attr);
+        };
+        list_del_init(attr_list);
+
+        list_for_each_entry_safe(data, n, kobj_list, node) {
+                list_del(&data->node);
+                if (data->hdr->id == id_nic)
+                        sysfs_remove_link(&data->kobj, "device");
+                kobject_put(&data->kobj);
+        };
+        list_del_init(kobj_list);
+}
+
+static int __init ibft_create_attribute(struct ibft_kobject *kobj_data,
+                                         int type,
+                                         const char *name,
+                                         ssize_t (*show)(struct ibft_kobject *,
+                                                         struct ibft_attribute*,
+                                                         char *buf),
+                                         struct list_head *list)
+{
+        struct ibft_attribute *attr = NULL;
+        struct ibft_hdr *hdr = kobj_data->hdr;
+
+        attr = kmalloc(sizeof(*attr), GFP_KERNEL);
+        if (!attr)
+                return -ENOMEM;
+
+        attr->attr.name = name;
+        attr->attr.mode = S_IRUSR;
+        attr->attr.owner = THIS_MODULE;
+
+        attr->hdr = hdr;
+        attr->show = show;
+        attr->kobj = &kobj_data->kobj;
+        attr->type = type;
+
+        list_add_tail(&attr->node, list);
+
+        return 0;
+}
+
+/*
+ * Helper routiners to check to determine if the entry is valid
+ * in the proper iBFT structure.
+ */
+static int __init ibft_check_nic_for(struct ibft_nic *nic, int entry)
+{
+        int rc = 0;
+
+        switch (entry) {
+        case ibft_eth_index:
+        case ibft_eth_flags:
+                rc = 1;
+                break;
+        case ibft_eth_ip_addr:
+                if (!memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
+                        rc = 1;
+                break;
+        case ibft_eth_subnet_mask:
+                if (!memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
+                        rc = 1;
+                break;
+        case ibft_eth_origin:
+                rc = 1;
+                break;
+        case ibft_eth_gateway:
+                if (memcmp(nic->gateway, nulls, sizeof(nic->gateway)))
+                        rc = 1;
+                break;
+        case ibft_eth_primary_dns:
+                if (memcmp(nic->primary_dns, nulls,
+                           sizeof(nic->primary_dns)))
+                        rc = 1;
+                break;
+        case ibft_eth_secondary_dns:
+                if (memcmp(nic->secondary_dns, nulls,
+                           sizeof(nic->secondary_dns)))
+                        rc = 1;
+                break;
+        case ibft_eth_dhcp:
+                if (memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
+                        rc = 1;
+                break;
+        case ibft_eth_vlan:
+        case ibft_eth_mac:
+                rc = 1;
+                break;
+        case ibft_eth_hostname:
+                if (nic->hostname_off)
+                        rc = 1;
+                break;
+        default:
+                break;
+        }
+
+        return rc;
+}
+
+static int __init ibft_check_tgt_for(struct ibft_tgt *tgt, int entry)
+{
+        int rc = 0;
+
+        switch (entry) {
+        case ibft_tgt_index:
+        case ibft_tgt_flags:
+        case ibft_tgt_ip_addr:
+        case ibft_tgt_port:
+        case ibft_tgt_lun:
+        case ibft_tgt_nic_assoc:
+        case ibft_tgt_chap_type:
+                rc = 1;
+        case ibft_tgt_name:
+                if (tgt->tgt_name_len)
+                        rc = 1;
+                break;
+        case ibft_tgt_chap_name:
+        case ibft_tgt_chap_secret:
+                if (tgt->chap_name_len)
+                        rc = 1;
+                break;
+        case ibft_tgt_rev_chap_name:
+        case ibft_tgt_rev_chap_secret:
+                if (tgt->rev_chap_name_len)
+                        rc = 1;
+                break;
+        default:
+                break;
+        }
+
+        return rc;
+}
+
+static int __init ibft_check_initiator_for(struct ibft_initiator *init,
+                                            int entry)
+{
+        int rc = 0;
+
+        switch (entry) {
+        case ibft_init_index:
+        case ibft_init_flags:
+                rc = 1;
+                break;
+        case ibft_init_isns_server:
+                if (memcmp(init->isns_server, nulls,
+                           sizeof(init->isns_server)))
+                        rc = 1;
+                break;
+        case ibft_init_slp_server:
+                if (memcmp(init->slp_server, nulls,
+                           sizeof(init->slp_server)))
+                        rc = 1;
+                break;
+        case ibft_init_pri_radius_server:
+                if (memcmp(init->pri_radius_server, nulls,
+                           sizeof(init->pri_radius_server)))
+                        rc = 1;
+                break;
+        case ibft_init_sec_radius_server:
+                if (memcmp(init->sec_radius_server, nulls,
+                           sizeof(init->sec_radius_server)))
+                        rc = 1;
+                break;
+        case ibft_init_initiator_name:
+                if (init->initiator_name_len)
+                        rc = 1;
+                break;
+        default:
+                break;
+        }
+
+        return rc;
+}
+
+/*
+ *  Register the attributes for all of the kobjects.
+ */
+static int __init ibft_register_attributes(struct list_head *kobject_list,
+                                            struct list_head *attr_list)
+{
+        int rc = 0, i = 0;
+        struct ibft_kobject *data = NULL;
+        struct ibft_attribute *attr = NULL, *m;
+
+        list_for_each_entry(data, kobject_list, node) {
+                switch (data->hdr->id) {
+                case id_nic:
+                        for (i = 0; i < ibft_eth_end_marker && !rc; i++)
+                                if (ibft_check_nic_for(data->nic, i))
+                                        rc = ibft_create_attribute(data, i,
+                                                ibft_eth_properties[i],
+                                                ibft_attr_show_nic, attr_list);
+                        break;
+                case id_target:
+                        for (i = 0; i < ibft_tgt_end_marker && !rc; i++)
+                                if (ibft_check_tgt_for(data->tgt, i))
+                                        rc = ibft_create_attribute(data, i,
+                                                ibft_tgt_properties[i],
+                                                ibft_attr_show_target,
+                                                attr_list);
+                        break;
+                case id_initiator:
+                        for (i = 0; i < ibft_init_end_marker && !rc; i++)
+                                if (ibft_check_initiator_for(
+                                        data->initiator, i))
+                                        rc = ibft_create_attribute(data, i,
+                                                ibft_initiator_properties[i],
+                                                ibft_attr_show_initiator,
+                                                attr_list);
+                        break;
+                default:
+                        break;
+                }
+                if (rc)
+                        break;
+        }
+        list_for_each_entry_safe(attr, m, attr_list, node) {
+                rc = sysfs_create_file(attr->kobj, &attr->attr);
+                if (rc) {
+                        list_del(&attr->node);
+                        kfree(attr);
+                        break;
+                }
+        }
+
+        return rc;
+}
+
+/*
+ * ibft_init() - creates sysfs tree entries for the iBFT data.
+ */
+static int __init ibft_init(void)
+{
+        int rc = 0;
+
+        ibft_kset = kset_create_and_add("ibft", NULL, firmware_kobj);
+        if (!ibft_kset)
+                return -ENOMEM;
+
+        if (ibft_addr) {
+                printk(KERN_INFO "iBFT detected at 0x%lx.\n",
+                       virt_to_phys((void *)ibft_addr));
+
+                rc = ibft_check_device();
+                if (rc)
+                        goto out_firmware_unregister;
+
+                /* Scan the IBFT for data and register the kobjects. */
+                rc = ibft_register_kobjects(ibft_addr, &ibft_kobject_list);
+                if (rc)
+                        goto out_free;
+
+                /* Register the attributes */
+                rc = ibft_register_attributes(&ibft_kobject_list,
+                                              &ibft_attr_list);
+                if (rc)
+                        goto out_free;
+        } else
+                printk(KERN_INFO "No iBFT detected.\n");
+
+        return 0;
+
+out_free:
+        ibft_unregister(&ibft_attr_list, &ibft_kobject_list);
+out_firmware_unregister:
+        kset_unregister(ibft_kset);
+        return rc;
+}
+
+static void __exit ibft_exit(void)
+{
+        ibft_unregister(&ibft_attr_list, &ibft_kobject_list);
+        kset_unregister(ibft_kset);
+}
+
+module_init(ibft_init);
+module_exit(ibft_exit);
diff --git a/drivers/firmware/iscsi_ibft_find.c b/drivers/firmware/iscsi_ibft_find.c
new file mode 100644
index 000000000000..d0e5fa4ea51b
--- /dev/null
+++ b/drivers/firmware/iscsi_ibft_find.c
@@ -0,0 +1,84 @@
+/*
+ *  Copyright 2007 Red Hat, Inc.
+ *  by Peter Jones <pjones@redhat.com>
+ *  Copyright 2007 IBM, Inc.
+ *  by Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
+ *  Copyright 2008
+ *  by Konrad Rzeszutek <ketuzsezr@darnok.org>
+ *
+ * This code finds the iSCSI Boot Format Table.
+ *
+ * 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.
+ */
+
+#include <linux/bootmem.h>
+#include <linux/blkdev.h>
+#include <linux/ctype.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/init.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 <asm/mmzone.h>
+
+/*
+ * Physical location of iSCSI Boot Format Table.
+ */
+struct ibft_table_header *ibft_addr;
+EXPORT_SYMBOL_GPL(ibft_addr);
+
+#define IBFT_SIGN "iBFT"
+#define IBFT_SIGN_LEN 4
+#define IBFT_START 0x80000 /* 512kB */
+#define IBFT_END 0x100000 /* 1MB */
+#define VGA_MEM 0xA0000 /* VGA buffer */
+#define VGA_SIZE 0x20000 /* 128kB */
+
+
+/*
+ * Routine used to find the iSCSI Boot Format Table. The logical
+ * kernel address is set in the ibft_addr global variable.
+ */
+void __init reserve_ibft_region(void)
+{
+        unsigned long pos;
+        unsigned int len = 0;
+        void *virt;
+
+        ibft_addr = 0;
+
+        for (pos = IBFT_START; pos < IBFT_END; pos += 16) {
+                /* The table can't be inside the VGA BIOS reserved space,
+                 * so skip that area */
+                if (pos == VGA_MEM)
+                        pos += VGA_SIZE;
+                virt = phys_to_virt(pos);
+                if (memcmp(virt, IBFT_SIGN, IBFT_SIGN_LEN) == 0) {
+                        unsigned long *addr =
+                            (unsigned long *)phys_to_virt(pos + 4);
+                        len = *addr;
+                        /* if the length of the table extends past 1M,
+                         * the table cannot be valid. */
+                        if (pos + len <= (IBFT_END-1)) {
+                                ibft_addr = (struct ibft_table_header *)virt;
+                                break;
+                        }
+                }
+        }
+        if (ibft_addr)
+                reserve_bootmem(pos, PAGE_ALIGN(len), BOOTMEM_DEFAULT);
+}
+EXPORT_SYMBOL_GPL(reserve_ibft_region);
diff --git a/include/linux/iscsi_ibft.h b/include/linux/iscsi_ibft.h
new file mode 100644
index 000000000000..6092487e2950
--- /dev/null
+++ b/include/linux/iscsi_ibft.h
@@ -0,0 +1,50 @@
+/*
+ *  Copyright 2007 Red Hat, Inc.
+ *  by Peter Jones <pjones@redhat.com>
+ *  Copyright 2007 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.
+ */
+
+#ifndef ISCSI_IBFT_H
+#define ISCSI_IBFT_H
+
+struct ibft_table_header {
+        char signature[4];
+        u32 length;
+        u8 revision;
+        u8 checksum;
+        char oem_id[6];
+        char oem_table_id[8];
+        char reserved[24];
+} __attribute__((__packed__));
+
+/*
+ * Logical location of iSCSI Boot Format Table.
+ * If the value is NULL there is no iBFT on the machine.
+ */
+extern struct ibft_table_header *ibft_addr;
+
+/*
+ * Routine used to find and reserve the iSCSI Boot Format Table. The
+ * mapped address is set in the ibft_addr variable.
+ */
+#ifdef CONFIG_ISCSI_IBFT_FIND
+extern void __init reserve_ibft_region(void);
+#else
+static inline void reserve_ibft_region(void) { }
+#endif
+
+#endif /* ISCSI_IBFT_H */