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path: root/drivers/firmware/iscsi_ibft.c
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Diffstat (limited to 'drivers/firmware/iscsi_ibft.c')
-rw-r--r--drivers/firmware/iscsi_ibft.c821
1 files changed, 821 insertions, 0 deletions
diff --git a/drivers/firmware/iscsi_ibft.c b/drivers/firmware/iscsi_ibft.c
new file mode 100644
index 00000000..3ee852c9
--- /dev/null
+++ b/drivers/firmware/iscsi_ibft.c
@@ -0,0 +1,821 @@
+/*
+ * 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;
+
+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, "%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 (memcmp(nic->ip_addr, nulls, sizeof(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 (memcmp(nic->gateway, nulls, sizeof(nic->gateway)))
+ rc = S_IRUGO;
+ break;
+ case ISCSI_BOOT_ETH_PRIMARY_DNS:
+ if (memcmp(nic->primary_dns, nulls,
+ sizeof(nic->primary_dns)))
+ rc = S_IRUGO;
+ break;
+ case ISCSI_BOOT_ETH_SECONDARY_DNS:
+ if (memcmp(nic->secondary_dns, nulls,
+ sizeof(nic->secondary_dns)))
+ rc = S_IRUGO;
+ break;
+ case ISCSI_BOOT_ETH_DHCP:
+ if (memcmp(nic->dhcp, nulls, sizeof(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 (memcmp(init->isns_server, nulls,
+ sizeof(init->isns_server)))
+ rc = S_IRUGO;
+ break;
+ case ISCSI_BOOT_INI_SLP_SERVER:
+ if (memcmp(init->slp_server, nulls,
+ sizeof(init->slp_server)))
+ rc = S_IRUGO;
+ break;
+ case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:
+ if (memcmp(init->pri_radius_server, nulls,
+ sizeof(init->pri_radius_server)))
+ rc = S_IRUGO;
+ break;
+ case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:
+ if (memcmp(init->sec_radius_server, nulls,
+ sizeof(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" },
+};
+
+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);
generated by cgit (git 2.34.1) at 2024-12-20 09:31:16 +0000