diff options
Diffstat (limited to 'drivers/ieee1394/sbp2.c')
| -rw-r--r-- | drivers/ieee1394/sbp2.c | 2138 |
1 files changed, 0 insertions, 2138 deletions
diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c deleted file mode 100644 index d6e251a300c..00000000000 --- a/drivers/ieee1394/sbp2.c +++ /dev/null @@ -1,2138 +0,0 @@ -/* - * sbp2.c - SBP-2 protocol driver for IEEE-1394 - * - * Copyright (C) 2000 James Goodwin, Filanet Corporation (www.filanet.com) - * jamesg@filanet.com (JSG) - * - * Copyright (C) 2003 Ben Collins <bcollins@debian.org> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * 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. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software Foundation, - * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - */ - -/* - * Brief Description: - * - * This driver implements the Serial Bus Protocol 2 (SBP-2) over IEEE-1394 - * under Linux. The SBP-2 driver is implemented as an IEEE-1394 high-level - * driver. It also registers as a SCSI lower-level driver in order to accept - * SCSI commands for transport using SBP-2. - * - * You may access any attached SBP-2 (usually storage devices) as regular - * SCSI devices. E.g. mount /dev/sda1, fdisk, mkfs, etc.. - * - * See http://www.t10.org/drafts.htm#sbp2 for the final draft of the SBP-2 - * specification and for where to purchase the official standard. - * - * TODO: - * - look into possible improvements of the SCSI error handlers - * - handle Unit_Characteristics.mgt_ORB_timeout and .ORB_size - * - handle Logical_Unit_Number.ordered - * - handle src == 1 in status blocks - * - reimplement the DMA mapping in absence of physical DMA so that - * bus_to_virt is no longer required - * - debug the handling of absent physical DMA - * - replace CONFIG_IEEE1394_SBP2_PHYS_DMA by automatic detection - * (this is easy but depends on the previous two TODO items) - * - make the parameter serialize_io configurable per device - * - move all requests to fetch agent registers into non-atomic context, - * replace all usages of sbp2util_node_write_no_wait by true transactions - * Grep for inline FIXME comments below. - */ - -#include <linux/blkdev.h> -#include <linux/compiler.h> -#include <linux/delay.h> -#include <linux/device.h> -#include <linux/dma-mapping.h> -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/list.h> -#include <linux/mm.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/sched.h> -#include <linux/slab.h> -#include <linux/spinlock.h> -#include <linux/stat.h> -#include <linux/string.h> -#include <linux/stringify.h> -#include <linux/types.h> -#include <linux/wait.h> -#include <linux/workqueue.h> -#include <linux/scatterlist.h> - -#include <asm/byteorder.h> -#include <asm/errno.h> -#include <asm/param.h> -#include <asm/system.h> -#include <asm/types.h> - -#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA -#include <asm/io.h> /* for bus_to_virt */ -#endif - -#include <scsi/scsi.h> -#include <scsi/scsi_cmnd.h> -#include <scsi/scsi_dbg.h> -#include <scsi/scsi_device.h> -#include <scsi/scsi_host.h> - -#include "csr1212.h" -#include "highlevel.h" -#include "hosts.h" -#include "ieee1394.h" -#include "ieee1394_core.h" -#include "ieee1394_hotplug.h" -#include "ieee1394_transactions.h" -#include "ieee1394_types.h" -#include "nodemgr.h" -#include "sbp2.h" - -/* - * Module load parameter definitions - */ - -/* - * Change max_speed on module load if you have a bad IEEE-1394 - * controller that has trouble running 2KB packets at 400mb. - * - * NOTE: On certain OHCI parts I have seen short packets on async transmit - * (probably due to PCI latency/throughput issues with the part). You can - * bump down the speed if you are running into problems. - */ -static int sbp2_max_speed = IEEE1394_SPEED_MAX; -module_param_named(max_speed, sbp2_max_speed, int, 0644); -MODULE_PARM_DESC(max_speed, "Limit data transfer speed (5 <= 3200, " - "4 <= 1600, 3 <= 800, 2 <= 400, 1 <= 200, 0 = 100 Mb/s)"); - -/* - * Set serialize_io to 0 or N to use dynamically appended lists of command ORBs. - * This is and always has been buggy in multiple subtle ways. See above TODOs. - */ -static int sbp2_serialize_io = 1; -module_param_named(serialize_io, sbp2_serialize_io, bool, 0444); -MODULE_PARM_DESC(serialize_io, "Serialize requests coming from SCSI drivers " - "(default = Y, faster but buggy = N)"); - -/* - * Adjust max_sectors if you'd like to influence how many sectors each SCSI - * command can transfer at most. Please note that some older SBP-2 bridge - * chips are broken for transfers greater or equal to 128KB, therefore - * max_sectors used to be a safe 255 sectors for many years. We now have a - * default of 0 here which means that we let the SCSI stack choose a limit. - * - * The SBP2_WORKAROUND_128K_MAX_TRANS flag, if set either in the workarounds - * module parameter or in the sbp2_workarounds_table[], will override the - * value of max_sectors. We should use sbp2_workarounds_table[] to cover any - * bridge chip which becomes known to need the 255 sectors limit. - */ -static int sbp2_max_sectors; -module_param_named(max_sectors, sbp2_max_sectors, int, 0444); -MODULE_PARM_DESC(max_sectors, "Change max sectors per I/O supported " - "(default = 0 = use SCSI stack's default)"); - -/* - * Exclusive login to sbp2 device? In most cases, the sbp2 driver should - * do an exclusive login, as it's generally unsafe to have two hosts - * talking to a single sbp2 device at the same time (filesystem coherency, - * etc.). If you're running an sbp2 device that supports multiple logins, - * and you're either running read-only filesystems or some sort of special - * filesystem supporting multiple hosts, e.g. OpenGFS, Oracle Cluster - * File System, or Lustre, then set exclusive_login to zero. - * - * So far only bridges from Oxford Semiconductor are known to support - * concurrent logins. Depending on firmware, four or two concurrent logins - * are possible on OXFW911 and newer Oxsemi bridges. - */ -static int sbp2_exclusive_login = 1; -module_param_named(exclusive_login, sbp2_exclusive_login, bool, 0644); -MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device " - "(default = Y, use N for concurrent initiators)"); - -/* - * If any of the following workarounds is required for your device to work, - * please submit the kernel messages logged by sbp2 to the linux1394-devel - * mailing list. - * - * - 128kB max transfer - * Limit transfer size. Necessary for some old bridges. - * - * - 36 byte inquiry - * When scsi_mod probes the device, let the inquiry command look like that - * from MS Windows. - * - * - skip mode page 8 - * Suppress sending of mode_sense for mode page 8 if the device pretends to - * support the SCSI Primary Block commands instead of Reduced Block Commands. - * - * - fix capacity - * Tell sd_mod to correct the last sector number reported by read_capacity. - * Avoids access beyond actual disk limits on devices with an off-by-one bug. - * Don't use this with devices which don't have this bug. - * - * - delay inquiry - * Wait extra SBP2_INQUIRY_DELAY seconds after login before SCSI inquiry. - * - * - power condition - * Set the power condition field in the START STOP UNIT commands sent by - * sd_mod on suspend, resume, and shutdown (if manage_start_stop is on). - * Some disks need this to spin down or to resume properly. - * - * - override internal blacklist - * Instead of adding to the built-in blacklist, use only the workarounds - * specified in the module load parameter. - * Useful if a blacklist entry interfered with a non-broken device. - */ -static int sbp2_default_workarounds; -module_param_named(workarounds, sbp2_default_workarounds, int, 0644); -MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0" - ", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS) - ", 36 byte inquiry = " __stringify(SBP2_WORKAROUND_INQUIRY_36) - ", skip mode page 8 = " __stringify(SBP2_WORKAROUND_MODE_SENSE_8) - ", fix capacity = " __stringify(SBP2_WORKAROUND_FIX_CAPACITY) - ", delay inquiry = " __stringify(SBP2_WORKAROUND_DELAY_INQUIRY) - ", set power condition in start stop unit = " - __stringify(SBP2_WORKAROUND_POWER_CONDITION) - ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE) - ", or a combination)"); - -/* - * This influences the format of the sysfs attribute - * /sys/bus/scsi/devices/.../ieee1394_id. - * - * The default format is like in older kernels: %016Lx:%d:%d - * It contains the target's EUI-64, a number given to the logical unit by - * the ieee1394 driver's nodemgr (starting at 0), and the LUN. - * - * The long format is: %016Lx:%06x:%04x - * It contains the target's EUI-64, the unit directory's directory_ID as per - * IEEE 1212 clause 7.7.19, and the LUN. This format comes closest to the - * format of SBP(-3) target port and logical unit identifier as per SAM (SCSI - * Architecture Model) rev.2 to 4 annex A. Therefore and because it is - * independent of the implementation of the ieee1394 nodemgr, the longer format - * is recommended for future use. - */ -static int sbp2_long_sysfs_ieee1394_id; -module_param_named(long_ieee1394_id, sbp2_long_sysfs_ieee1394_id, bool, 0644); -MODULE_PARM_DESC(long_ieee1394_id, "8+3+2 bytes format of ieee1394_id in sysfs " - "(default = backwards-compatible = N, SAM-conforming = Y)"); - - -#define SBP2_INFO(fmt, args...) HPSB_INFO("sbp2: "fmt, ## args) -#define SBP2_ERR(fmt, args...) HPSB_ERR("sbp2: "fmt, ## args) - -/* - * Globals - */ -static void sbp2scsi_complete_all_commands(struct sbp2_lu *, u32); -static void sbp2scsi_complete_command(struct sbp2_lu *, u32, struct scsi_cmnd *, - void (*)(struct scsi_cmnd *)); -static struct sbp2_lu *sbp2_alloc_device(struct unit_directory *); -static int sbp2_start_device(struct sbp2_lu *); -static void sbp2_remove_device(struct sbp2_lu *); -static int sbp2_login_device(struct sbp2_lu *); -static int sbp2_reconnect_device(struct sbp2_lu *); -static int sbp2_logout_device(struct sbp2_lu *); -static void sbp2_host_reset(struct hpsb_host *); -static int sbp2_handle_status_write(struct hpsb_host *, int, int, quadlet_t *, - u64, size_t, u16); -static int sbp2_agent_reset(struct sbp2_lu *, int); -static void sbp2_parse_unit_directory(struct sbp2_lu *, - struct unit_directory *); -static int sbp2_set_busy_timeout(struct sbp2_lu *); -static int sbp2_max_speed_and_size(struct sbp2_lu *); - - -static const u8 sbp2_speedto_max_payload[] = { 0x7, 0x8, 0x9, 0xa, 0xa, 0xa }; - -static DEFINE_RWLOCK(sbp2_hi_logical_units_lock); - -static struct hpsb_highlevel sbp2_highlevel = { - .name = SBP2_DEVICE_NAME, - .host_reset = sbp2_host_reset, -}; - -static const struct hpsb_address_ops sbp2_ops = { - .write = sbp2_handle_status_write -}; - -#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA -static int sbp2_handle_physdma_write(struct hpsb_host *, int, int, quadlet_t *, - u64, size_t, u16); -static int sbp2_handle_physdma_read(struct hpsb_host *, int, quadlet_t *, u64, - size_t, u16); - -static const struct hpsb_address_ops sbp2_physdma_ops = { - .read = sbp2_handle_physdma_read, - .write = sbp2_handle_physdma_write, -}; -#endif - - -/* - * Interface to driver core and IEEE 1394 core - */ -static const struct ieee1394_device_id sbp2_id_table[] = { - { - .match_flags = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION, - .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY & 0xffffff, - .version = SBP2_SW_VERSION_ENTRY & 0xffffff}, - {} -}; -MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table); - -static int sbp2_probe(struct device *); -static int sbp2_remove(struct device *); -static int sbp2_update(struct unit_directory *); - -static struct hpsb_protocol_driver sbp2_driver = { - .name = SBP2_DEVICE_NAME, - .id_table = sbp2_id_table, - .update = sbp2_update, - .driver = { - .probe = sbp2_probe, - .remove = sbp2_remove, - }, -}; - - -/* - * Interface to SCSI core - */ -static int sbp2scsi_queuecommand(struct scsi_cmnd *, - void (*)(struct scsi_cmnd *)); -static int sbp2scsi_abort(struct scsi_cmnd *); -static int sbp2scsi_reset(struct scsi_cmnd *); -static int sbp2scsi_slave_alloc(struct scsi_device *); -static int sbp2scsi_slave_configure(struct scsi_device *); -static void sbp2scsi_slave_destroy(struct scsi_device *); -static ssize_t sbp2_sysfs_ieee1394_id_show(struct device *, - struct device_attribute *, char *); - -static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL); - -static struct device_attribute *sbp2_sysfs_sdev_attrs[] = { - &dev_attr_ieee1394_id, - NULL -}; - -static struct scsi_host_template sbp2_shost_template = { - .module = THIS_MODULE, - .name = "SBP-2 IEEE-1394", - .proc_name = SBP2_DEVICE_NAME, - .queuecommand = sbp2scsi_queuecommand, - .eh_abort_handler = sbp2scsi_abort, - .eh_device_reset_handler = sbp2scsi_reset, - .slave_alloc = sbp2scsi_slave_alloc, - .slave_configure = sbp2scsi_slave_configure, - .slave_destroy = sbp2scsi_slave_destroy, - .this_id = -1, - .sg_tablesize = SG_ALL, - .use_clustering = ENABLE_CLUSTERING, - .cmd_per_lun = SBP2_MAX_CMDS, - .can_queue = SBP2_MAX_CMDS, - .sdev_attrs = sbp2_sysfs_sdev_attrs, -}; - -#define SBP2_ROM_VALUE_WILDCARD ~0 /* match all */ -#define SBP2_ROM_VALUE_MISSING 0xff000000 /* not present in the unit dir. */ - -/* - * List of devices with known bugs. - * - * The firmware_revision field, masked with 0xffff00, is the best indicator - * for the type of bridge chip of a device. It yields a few false positives - * but this did not break correctly behaving devices so far. - */ -static const struct { - u32 firmware_revision; - u32 model; - unsigned workarounds; -} sbp2_workarounds_table[] = { - /* DViCO Momobay CX-1 with TSB42AA9 bridge */ { - .firmware_revision = 0x002800, - .model = 0x001010, - .workarounds = SBP2_WORKAROUND_INQUIRY_36 | - SBP2_WORKAROUND_MODE_SENSE_8 | - SBP2_WORKAROUND_POWER_CONDITION, - }, - /* DViCO Momobay FX-3A with TSB42AA9A bridge */ { - .firmware_revision = 0x002800, - .model = 0x000000, - .workarounds = SBP2_WORKAROUND_POWER_CONDITION, - }, - /* Initio bridges, actually only needed for some older ones */ { - .firmware_revision = 0x000200, - .model = SBP2_ROM_VALUE_WILDCARD, - .workarounds = SBP2_WORKAROUND_INQUIRY_36, - }, - /* PL-3507 bridge with Prolific firmware */ { - .firmware_revision = 0x012800, - .model = SBP2_ROM_VALUE_WILDCARD, - .workarounds = SBP2_WORKAROUND_POWER_CONDITION, - }, - /* Symbios bridge */ { - .firmware_revision = 0xa0b800, - .model = SBP2_ROM_VALUE_WILDCARD, - .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, - }, - /* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ { - .firmware_revision = 0x002600, - .model = SBP2_ROM_VALUE_WILDCARD, - .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, - }, - /* - * iPod 2nd generation: needs 128k max transfer size workaround - * iPod 3rd generation: needs fix capacity workaround - */ - { - .firmware_revision = 0x0a2700, - .model = 0x000000, - .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS | - SBP2_WORKAROUND_FIX_CAPACITY, - }, - /* iPod 4th generation */ { - .firmware_revision = 0x0a2700, - .model = 0x000021, - .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, - }, - /* iPod mini */ { - .firmware_revision = 0x0a2700, - .model = 0x000022, - .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, - }, - /* iPod mini */ { - .firmware_revision = 0x0a2700, - .model = 0x000023, - .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, - }, - /* iPod Photo */ { - .firmware_revision = 0x0a2700, - .model = 0x00007e, - .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, - } -}; - -/************************************** - * General utility functions - **************************************/ - -#ifndef __BIG_ENDIAN -/* - * Converts a buffer from be32 to cpu byte ordering. Length is in bytes. - */ -static inline void sbp2util_be32_to_cpu_buffer(void *buffer, int length) -{ - u32 *temp = buffer; - - for (length = (length >> 2); length--; ) - temp[length] = be32_to_cpu(temp[length]); -} - -/* - * Converts a buffer from cpu to be32 byte ordering. Length is in bytes. - */ -static inline void sbp2util_cpu_to_be32_buffer(void *buffer, int length) -{ - u32 *temp = buffer; - - for (length = (length >> 2); length--; ) - temp[length] = cpu_to_be32(temp[length]); -} -#else /* BIG_ENDIAN */ -/* Why waste the cpu cycles? */ -#define sbp2util_be32_to_cpu_buffer(x,y) do {} while (0) -#define sbp2util_cpu_to_be32_buffer(x,y) do {} while (0) -#endif - -static DECLARE_WAIT_QUEUE_HEAD(sbp2_access_wq); - -/* - * Waits for completion of an SBP-2 access request. - * Returns nonzero if timed out or prematurely interrupted. - */ -static int sbp2util_access_timeout(struct sbp2_lu *lu, int timeout) -{ - long leftover; - - leftover = wait_event_interruptible_timeout( - sbp2_access_wq, lu->access_complete, timeout); - lu->access_complete = 0; - return leftover <= 0; -} - -static void sbp2_free_packet(void *packet) -{ - hpsb_free_tlabel(packet); - hpsb_free_packet(packet); -} - -/* - * This is much like hpsb_node_write(), except it ignores the response - * subaction and returns immediately. Can be used from atomic context. - */ -static int sbp2util_node_write_no_wait(struct node_entry *ne, u64 addr, - quadlet_t *buf, size_t len) -{ - struct hpsb_packet *packet; - - packet = hpsb_make_writepacket(ne->host, ne->nodeid, addr, buf, len); - if (!packet) - return -ENOMEM; - - hpsb_set_packet_complete_task(packet, sbp2_free_packet, packet); - hpsb_node_fill_packet(ne, packet); - if (hpsb_send_packet(packet) < 0) { - sbp2_free_packet(packet); - return -EIO; - } - return 0; -} - -static void sbp2util_notify_fetch_agent(struct sbp2_lu *lu, u64 offset, - quadlet_t *data, size_t len) -{ - /* There is a small window after a bus reset within which the node - * entry's generation is current but the reconnect wasn't completed. */ - if (unlikely(atomic_read(&lu->state) == SBP2LU_STATE_IN_RESET)) - return; - - if (hpsb_node_write(lu->ne, lu->command_block_agent_addr + offset, - data, len)) - SBP2_ERR("sbp2util_notify_fetch_agent failed."); - - /* Now accept new SCSI commands, unless a bus reset happended during - * hpsb_node_write. */ - if (likely(atomic_read(&lu->state) != SBP2LU_STATE_IN_RESET)) - scsi_unblock_requests(lu->shost); -} - -static void sbp2util_write_orb_pointer(struct work_struct *work) -{ - struct sbp2_lu *lu = container_of(work, struct sbp2_lu, protocol_work); - quadlet_t data[2]; - - data[0] = ORB_SET_NODE_ID(lu->hi->host->node_id); - data[1] = lu->last_orb_dma; - sbp2util_cpu_to_be32_buffer(data, 8); - sbp2util_notify_fetch_agent(lu, SBP2_ORB_POINTER_OFFSET, data, 8); -} - -static void sbp2util_write_doorbell(struct work_struct *work) -{ - struct sbp2_lu *lu = container_of(work, struct sbp2_lu, protocol_work); - - sbp2util_notify_fetch_agent(lu, SBP2_DOORBELL_OFFSET, NULL, 4); -} - -static int sbp2util_create_command_orb_pool(struct sbp2_lu *lu) -{ - struct sbp2_command_info *cmd; - struct device *dmadev = lu->hi->host->device.parent; - int i, orbs = sbp2_serialize_io ? 2 : SBP2_MAX_CMDS; - - for (i = 0; i < orbs; i++) { - cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); - if (!cmd) - goto failed_alloc; - - cmd->command_orb_dma = - dma_map_single(dmadev, &cmd->command_orb, - sizeof(struct sbp2_command_orb), - DMA_TO_DEVICE); - if (dma_mapping_error(dmadev, cmd->command_orb_dma)) - goto failed_orb; - - cmd->sge_dma = - dma_map_single(dmadev, &cmd->scatter_gather_element, - sizeof(cmd->scatter_gather_element), - DMA_TO_DEVICE); - if (dma_mapping_error(dmadev, cmd->sge_dma)) - goto failed_sge; - - INIT_LIST_HEAD(&cmd->list); - list_add_tail(&cmd->list, &lu->cmd_orb_completed); - } - return 0; - -failed_sge: - dma_unmap_single(dmadev, cmd->command_orb_dma, - sizeof(struct sbp2_command_orb), DMA_TO_DEVICE); -failed_orb: - kfree(cmd); -failed_alloc: - return -ENOMEM; -} - -static void sbp2util_remove_command_orb_pool(struct sbp2_lu *lu, - struct hpsb_host *host) -{ - struct list_head *lh, *next; - struct sbp2_command_info *cmd; - unsigned long flags; - - spin_lock_irqsave(&lu->cmd_orb_lock, flags); - if (!list_empty(&lu->cmd_orb_completed)) - list_for_each_safe(lh, next, &lu->cmd_orb_completed) { - cmd = list_entry(lh, struct sbp2_command_info, list); - dma_unmap_single(host->device.parent, - cmd->command_orb_dma, - sizeof(struct sbp2_command_orb), - DMA_TO_DEVICE); - dma_unmap_single(host->device.parent, cmd->sge_dma, - sizeof(cmd->scatter_gather_element), - DMA_TO_DEVICE); - kfree(cmd); - } - spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); - return; -} - -/* - * Finds the sbp2_command for a given outstanding command ORB. - * Only looks at the in-use list. - */ -static struct sbp2_command_info *sbp2util_find_command_for_orb( - struct sbp2_lu *lu, dma_addr_t orb) -{ - struct sbp2_command_info *cmd; - unsigned long flags; - - spin_lock_irqsave(&lu->cmd_orb_lock, flags); - if (!list_empty(&lu->cmd_orb_inuse)) - list_for_each_entry(cmd, &lu->cmd_orb_inuse, list) - if (cmd->command_orb_dma == orb) { - spin_unlock_irqrestore( - &lu->cmd_orb_lock, flags); - return cmd; - } - spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); - return NULL; -} - -/* - * Finds the sbp2_command for a given outstanding SCpnt. - * Only looks at the in-use list. - * Must be called with lu->cmd_orb_lock held. - */ -static struct sbp2_command_info *sbp2util_find_command_for_SCpnt( - struct sbp2_lu *lu, void *SCpnt) -{ - struct sbp2_command_info *cmd; - - if (!list_empty(&lu->cmd_orb_inuse)) - list_for_each_entry(cmd, &lu->cmd_orb_inuse, list) - if (cmd->Current_SCpnt == SCpnt) - return cmd; - return NULL; -} - -static struct sbp2_command_info *sbp2util_allocate_command_orb( - struct sbp2_lu *lu, - struct scsi_cmnd *Current_SCpnt, - void (*Current_done)(struct scsi_cmnd *)) -{ - struct list_head *lh; - struct sbp2_command_info *cmd = NULL; - unsigned long flags; - - spin_lock_irqsave(&lu->cmd_orb_lock, flags); - if (!list_empty(&lu->cmd_orb_completed)) { - lh = lu->cmd_orb_completed.next; - list_del(lh); - cmd = list_entry(lh, struct sbp2_command_info, list); - cmd->Current_done = Current_done; - cmd->Current_SCpnt = Current_SCpnt; - list_add_tail(&cmd->list, &lu->cmd_orb_inuse); - } else - SBP2_ERR("%s: no orbs available", __func__); - spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); - return cmd; -} - -/* - * Unmaps the DMAs of a command and moves the command to the completed ORB list. - * Must be called with lu->cmd_orb_lock held. - */ -static void sbp2util_mark_command_completed(struct sbp2_lu *lu, - struct sbp2_command_info *cmd) -{ - if (scsi_sg_count(cmd->Current_SCpnt)) - dma_unmap_sg(lu->ud->ne->host->device.parent, - scsi_sglist(cmd->Current_SCpnt), - scsi_sg_count(cmd->Current_SCpnt), - cmd->Current_SCpnt->sc_data_direction); - list_move_tail(&cmd->list, &lu->cmd_orb_completed); -} - -/* - * Is lu valid? Is the 1394 node still present? - */ -static inline int sbp2util_node_is_available(struct sbp2_lu *lu) -{ - return lu && lu->ne && !lu->ne->in_limbo; -} - -/********************************************* - * IEEE-1394 core driver stack related section - *********************************************/ - -static int sbp2_probe(struct device *dev) -{ - struct unit_directory *ud; - struct sbp2_lu *lu; - - ud = container_of(dev, struct unit_directory, device); - - /* Don't probe UD's that have the LUN flag. We'll probe the LUN(s) - * instead. */ - if (ud->flags & UNIT_DIRECTORY_HAS_LUN_DIRECTORY) - return -ENODEV; - - lu = sbp2_alloc_device(ud); - if (!lu) - return -ENOMEM; - - sbp2_parse_unit_directory(lu, ud); - return sbp2_start_device(lu); -} - -static int sbp2_remove(struct device *dev) -{ - struct unit_directory *ud; - struct sbp2_lu *lu; - struct scsi_device *sdev; - - ud = container_of(dev, struct unit_directory, device); - lu = dev_get_drvdata(&ud->device); - if (!lu) - return 0; - - if (lu->shost) { - /* Get rid of enqueued commands if there is no chance to - * send them. */ - if (!sbp2util_node_is_available(lu)) - sbp2scsi_complete_all_commands(lu, DID_NO_CONNECT); - /* scsi_remove_device() may trigger shutdown functions of SCSI - * highlevel drivers which would deadlock if blocked. */ - atomic_set(&lu->state, SBP2LU_STATE_IN_SHUTDOWN); - scsi_unblock_requests(lu->shost); - } - sdev = lu->sdev; - if (sdev) { - lu->sdev = NULL; - scsi_remove_device(sdev); - } - - sbp2_logout_device(lu); - sbp2_remove_device(lu); - - return 0; -} - -static int sbp2_update(struct unit_directory *ud) -{ - struct sbp2_lu *lu = dev_get_drvdata(&ud->device); - - if (sbp2_reconnect_device(lu) != 0) { - /* - * Reconnect failed. If another bus reset happened, - * let nodemgr proceed and call sbp2_update again later - * (or sbp2_remove if this node went away). - */ - if (!hpsb_node_entry_valid(lu->ne)) - return 0; - /* - * Or the target rejected the reconnect because we weren't - * fast enough. Try a regular login, but first log out - * just in case of any weirdness. - */ - sbp2_logout_device(lu); - - if (sbp2_login_device(lu) != 0) { - if (!hpsb_node_entry_valid(lu->ne)) - return 0; - - /* Maybe another initiator won the login. */ - SBP2_ERR("Failed to reconnect to sbp2 device!"); - return -EBUSY; - } - } - - sbp2_set_busy_timeout(lu); - sbp2_agent_reset(lu, 1); - sbp2_max_speed_and_size(lu); - - /* Complete any pending commands with busy (so they get retried) - * and remove them from our queue. */ - sbp2scsi_complete_all_commands(lu, DID_BUS_BUSY); - - /* Accept new commands unless there was another bus reset in the - * meantime. */ - if (hpsb_node_entry_valid(lu->ne)) { - atomic_set(&lu->state, SBP2LU_STATE_RUNNING); - scsi_unblock_requests(lu->shost); - } - return 0; -} - -static struct sbp2_lu *sbp2_alloc_device(struct unit_directory *ud) -{ - struct sbp2_fwhost_info *hi; - struct Scsi_Host *shost = NULL; - struct sbp2_lu *lu = NULL; - unsigned long flags; - - lu = kzalloc(sizeof(*lu), GFP_KERNEL); - if (!lu) { - SBP2_ERR("failed to create lu"); - goto failed_alloc; - } - - lu->ne = ud->ne; - lu->ud = ud; - lu->speed_code = IEEE1394_SPEED_100; - lu->max_payload_size = sbp2_speedto_max_payload[IEEE1394_SPEED_100]; - lu->status_fifo_addr = CSR1212_INVALID_ADDR_SPACE; - INIT_LIST_HEAD(&lu->cmd_orb_inuse); - INIT_LIST_HEAD(&lu->cmd_orb_completed); - INIT_LIST_HEAD(&lu->lu_list); - spin_lock_init(&lu->cmd_orb_lock); - atomic_set(&lu->state, SBP2LU_STATE_RUNNING); - INIT_WORK(&lu->protocol_work, NULL); - - dev_set_drvdata(&ud->device, lu); - - hi = hpsb_get_hostinfo(&sbp2_highlevel, ud->ne->host); - if (!hi) { - hi = hpsb_create_hostinfo(&sbp2_highlevel, ud->ne->host, - sizeof(*hi)); - if (!hi) { - SBP2_ERR("failed to allocate hostinfo"); - goto failed_alloc; - } - hi->host = ud->ne->host; - INIT_LIST_HEAD(&hi->logical_units); - -#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA - /* Handle data movement if physical dma is not - * enabled or not supported on host controller */ - if (!hpsb_register_addrspace(&sbp2_highlevel, ud->ne->host, - &sbp2_physdma_ops, - 0x0ULL, 0xfffffffcULL)) { - SBP2_ERR("failed to register lower 4GB address range"); - goto failed_alloc; - } -#endif - } - - if (dma_get_max_seg_size(hi->host->device.parent) > SBP2_MAX_SEG_SIZE) - BUG_ON(dma_set_max_seg_size(hi->host->device.parent, - SBP2_MAX_SEG_SIZE)); - - /* Prevent unloading of the 1394 host */ - if (!try_module_get(hi->host->driver->owner)) { - SBP2_ERR("failed to get a reference on 1394 host driver"); - goto failed_alloc; - } - - lu->hi = hi; - - write_lock_irqsave(&sbp2_hi_logical_units_lock, flags); - list_add_tail(&lu->lu_list, &hi->logical_units); - write_unlock_irqrestore(&sbp2_hi_logical_units_lock, flags); - - /* Register the status FIFO address range. We could use the same FIFO - * for targets at different nodes. However we need different FIFOs per - * target in order to support multi-unit devices. - * The FIFO is located out of the local host controller's physical range - * but, if possible, within the posted write area. Status writes will - * then be performed as unified transactions. This slightly reduces - * bandwidth usage, and some Prolific based devices seem to require it. - */ - lu->status_fifo_addr = hpsb_allocate_and_register_addrspace( - &sbp2_highlevel, ud->ne->host, &sbp2_ops, - sizeof(struct sbp2_status_block), sizeof(quadlet_t), - ud->ne->host->low_addr_space, CSR1212_ALL_SPACE_END); - if (lu->status_fifo_addr == CSR1212_INVALID_ADDR_SPACE) { - SBP2_ERR("failed to allocate status FIFO address range"); - goto failed_alloc; - } - - shost = scsi_host_alloc(&sbp2_shost_template, sizeof(unsigned long)); - if (!shost) { - SBP2_ERR("failed to register scsi host"); - goto failed_alloc; - } - - shost->hostdata[0] = (unsigned long)lu; - shost->max_cmd_len = SBP2_MAX_CDB_SIZE; - - if (!scsi_add_host(shost, &ud->device)) { - lu->shost = shost; - return lu; - } - - SBP2_ERR("failed to add scsi host"); - scsi_host_put(shost); - -failed_alloc: - sbp2_remove_device(lu); - return NULL; -} - -static void sbp2_host_reset(struct hpsb_host *host) -{ - struct sbp2_fwhost_info *hi; - struct sbp2_lu *lu; - unsigned long flags; - - hi = hpsb_get_hostinfo(&sbp2_highlevel, host); - if (!hi) - return; - - read_lock_irqsave(&sbp2_hi_logical_units_lock, flags); - - list_for_each_entry(lu, &hi->logical_units, lu_list) - if (atomic_cmpxchg(&lu->state, - SBP2LU_STATE_RUNNING, SBP2LU_STATE_IN_RESET) - == SBP2LU_STATE_RUNNING) - scsi_block_requests(lu->shost); - - read_unlock_irqrestore(&sbp2_hi_logical_units_lock, flags); -} - -static int sbp2_start_device(struct sbp2_lu *lu) -{ - struct sbp2_fwhost_info *hi = lu->hi; - int error; - - lu->login_response = dma_alloc_coherent(hi->host->device.parent, - sizeof(struct sbp2_login_response), - &lu->login_response_dma, GFP_KERNEL); - if (!lu->login_response) - goto alloc_fail; - - lu->query_logins_orb = dma_alloc_coherent(hi->host->device.parent, - sizeof(struct sbp2_query_logins_orb), - &lu->query_logins_orb_dma, GFP_KERNEL); - if (!lu->query_logins_orb) - goto alloc_fail; - - lu->query_logins_response = dma_alloc_coherent(hi->host->device.parent, - sizeof(struct sbp2_query_logins_response), - &lu->query_logins_response_dma, GFP_KERNEL); - if (!lu->query_logins_response) - goto alloc_fail; - - lu->reconnect_orb = dma_alloc_coherent(hi->host->device.parent, - sizeof(struct sbp2_reconnect_orb), - &lu->reconnect_orb_dma, GFP_KERNEL); - if (!lu->reconnect_orb) - goto alloc_fail; - - lu->logout_orb = dma_alloc_coherent(hi->host->device.parent, - sizeof(struct sbp2_logout_orb), - &lu->logout_orb_dma, GFP_KERNEL); - if (!lu->logout_orb) - goto alloc_fail; - - lu->login_orb = dma_alloc_coherent(hi->host->device.parent, - sizeof(struct sbp2_login_orb), - &lu->login_orb_dma, GFP_KERNEL); - if (!lu->login_orb) - goto alloc_fail; - - if (sbp2util_create_command_orb_pool(lu)) - goto alloc_fail; - - /* Wait a second before trying to log in. Previously logged in - * initiators need a chance to reconnect. */ - if (msleep_interruptible(1000)) { - sbp2_remove_device(lu); - return -EINTR; - } - - if (sbp2_login_device(lu)) { - sbp2_remove_device(lu); - return -EBUSY; - } - - sbp2_set_busy_timeout(lu); - sbp2_agent_reset(lu, 1); - sbp2_max_speed_and_size(lu); - - if (lu->workarounds & SBP2_WORKAROUND_DELAY_INQUIRY) - ssleep(SBP2_INQUIRY_DELAY); - - error = scsi_add_device(lu->shost, 0, lu->ud->id, 0); - if (error) { - SBP2_ERR("scsi_add_device failed"); - sbp2_logout_device(lu); - sbp2_remove_device(lu); - return error; - } - - return 0; - -alloc_fail: - SBP2_ERR("Could not allocate memory for lu"); - sbp2_remove_device(lu); - return -ENOMEM; -} - -static void sbp2_remove_device(struct sbp2_lu *lu) -{ - struct sbp2_fwhost_info *hi; - unsigned long flags; - - if (!lu) - return; - hi = lu->hi; - if (!hi) - goto no_hi; - - if (lu->shost) { - scsi_remove_host(lu->shost); - scsi_host_put(lu->shost); - } - flush_scheduled_work(); - sbp2util_remove_command_orb_pool(lu, hi->host); - - write_lock_irqsave(&sbp2_hi_logical_units_lock, flags); - list_del(&lu->lu_list); - write_unlock_irqrestore(&sbp2_hi_logical_units_lock, flags); - - if (lu->login_response) - dma_free_coherent(hi->host->device.parent, - sizeof(struct sbp2_login_response), - lu->login_response, - lu->login_response_dma); - if (lu->login_orb) - dma_free_coherent(hi->host->device.parent, - sizeof(struct sbp2_login_orb), - lu->login_orb, - lu->login_orb_dma); - if (lu->reconnect_orb) - dma_free_coherent(hi->host->device.parent, - sizeof(struct sbp2_reconnect_orb), - lu->reconnect_orb, - lu->reconnect_orb_dma); - if (lu->logout_orb) - dma_free_coherent(hi->host->device.parent, - sizeof(struct sbp2_logout_orb), - lu->logout_orb, - lu->logout_orb_dma); - if (lu->query_logins_orb) - dma_free_coherent(hi->host->device.parent, - sizeof(struct sbp2_query_logins_orb), - lu->query_logins_orb, - lu->query_logins_orb_dma); - if (lu->query_logins_response) - dma_free_coherent(hi->host->device.parent, - sizeof(struct sbp2_query_logins_response), - lu->query_logins_response, - lu->query_logins_response_dma); - - if (lu->status_fifo_addr != CSR1212_INVALID_ADDR_SPACE) - hpsb_unregister_addrspace(&sbp2_highlevel, hi->host, - lu->status_fifo_addr); - - dev_set_drvdata(&lu->ud->device, NULL); - - module_put(hi->host->driver->owner); -no_hi: - kfree(lu); -} - -#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA -/* - * Deal with write requests on adapters which do not support physical DMA or - * have it switched off. - */ -static int sbp2_handle_physdma_write(struct hpsb_host *host, int nodeid, - int destid, quadlet_t *data, u64 addr, - size_t length, u16 flags) -{ - memcpy(bus_to_virt((u32) addr), data, length); - return RCODE_COMPLETE; -} - -/* - * Deal with read requests on adapters which do not support physical DMA or - * have it switched off. - */ -static int sbp2_handle_physdma_read(struct hpsb_host *host, int nodeid, - quadlet_t *data, u64 addr, size_t length, - u16 flags) -{ - memcpy(data, bus_to_virt((u32) addr), length); - return RCODE_COMPLETE; -} -#endif - -/************************************** - * SBP-2 protocol related section |