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)
+ *