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sbp2.c
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sbp2.c
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/*
* sbp2.c - SBP-2 protocol driver for IEEE-1394
*
* Copyright (C) 2000 James Goodwin, Filanet Corporation (www.filanet.com)
* [email protected] (JSG)
*
* Copyright (C) 2003 Ben Collins <[email protected]>
*
* 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/gfp.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,
};
const static 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);
const static 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 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_DELAY_INQUIRY |
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 = ud->device.driver_data;
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 = ud->device.driver_data;
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);
ud->device.driver_data = 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;
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;