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linux/drivers/ieee1394/sbp2.c
Stefan Richter ed6ffd0808 ieee1394: sbp2: enforce s/g segment size limit 
1. We don't need to round the SBP-2 segment size limit down to a
   multiple of 4 kB (0xffff -> 0xf000).  It is only necessary to
   ensure quadlet alignment (0xffff -> 0xfffc).

2. Use dma_set_max_seg_size() to tell the DMA mapping infrastructure
   and the block IO layer about the restriction.  This way we can
   remove the size checks and segment splitting in the queuecommand
   path.

   This assumes that no other code in the ieee1394 stack uses
   dma_map_sg() with conflicting requirements.  It furthermore assumes
   that the controller device's platform actually allows us to set the
   segment size to our liking.  Assert the latter with a BUG_ON().

3. Also use blk_queue_max_segment_size() to tell the block IO layer
   about it.  It cannot know it because our scsi_add_host() does not
   point to the FireWire controller's device.

We can also uniformly use dma_map_sg() for the single segment case just
like for the multi segment case, to further simplify the code.

Also clean up how the page table is converted to big endian.

Thanks to Grant Grundler and FUJITA Tomonori for advice.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2008-10-15 22:21:07 +02:00

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/*
* 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/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, "Force max speed "
"(3 = 800Mb/s, 2 = 400Mb/s, 1 = 200Mb/s, 0 = 100Mb/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, 0xB, 0xC };
static DEFINE_RWLOCK(sbp2_hi_logical_units_lock);
static struct hpsb_highlevel sbp2_highlevel = {
.name = SBP2_DEVICE_NAME,
.host_reset = sbp2_host_reset,
};
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);
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,
};
/* for match-all entries in sbp2_workarounds_table */
#define SBP2_ROM_VALUE_WILDCARD 0x1000000
/*
* 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_id;
unsigned workarounds;
} sbp2_workarounds_table[] = {
/* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
.firmware_revision = 0x002800,
.model_id = 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_id = 0x000000,
.workarounds = SBP2_WORKAROUND_DELAY_INQUIRY |
SBP2_WORKAROUND_POWER_CONDITION,
},
/* Initio bridges, actually only needed for some older ones */ {
.firmware_revision = 0x000200,
.model_id = SBP2_ROM_VALUE_WILDCARD,
.workarounds = SBP2_WORKAROUND_INQUIRY_36,
},
/* PL-3507 bridge with Prolific firmware */ {
.firmware_revision = 0x012800,
.model_id = SBP2_ROM_VALUE_WILDCARD,
.workarounds = SBP2_WORKAROUND_POWER_CONDITION,
},
/* Symbios bridge */ {
.firmware_revision = 0xa0b800,
.model_id = SBP2_ROM_VALUE_WILDCARD,
.workarounds = SBP2_WORKAROUND_128K_MAX_TRANS,
},
/* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ {
.firmware_revision = 0x002600,
.model_id = SBP2_ROM_VALUE_WILDCARD,
.workarounds = SBP2_WORKAROUND_128K_MAX_TRANS,
},
/* iPod 4th generation */ {
.firmware_revision = 0x0a2700,
.model_id = 0x000021,
.workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
},
/* iPod mini */ {
.firmware_revision = 0x0a2700,
.model_id = 0x000023,
.workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
},
/* iPod Photo */ {
.firmware_revision = 0x0a2700,
.model_id = 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 (likely(atomic_read(&lu->state) !=
SBP2LU_STATE_IN_SHUTDOWN)) {
atomic_set(&lu->state, SBP2LU_STATE_IN_RESET);
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);
lu->ud->device.driver_data = 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
**************************************/
static int sbp2_query_logins(struct sbp2_lu *lu)
{
struct sbp2_fwhost_info *hi = lu->hi;
quadlet_t data[2];
int max_logins;
int active_logins;
lu->query_logins_orb->reserved1 = 0x0;
lu->query_logins_orb->reserved2 = 0x0;
lu->query_logins_orb->query_response_lo = lu->query_logins_response_dma;
lu->query_logins_orb->query_response_hi =
ORB_SET_NODE_ID(hi->host->node_id);
lu->query_logins_orb->lun_misc =
ORB_SET_FUNCTION(SBP2_QUERY_LOGINS_REQUEST);
lu->query_logins_orb->lun_misc |= ORB_SET_NOTIFY(1);
lu->query_logins_orb->lun_misc |= ORB_SET_LUN(lu->lun);
lu->query_logins_orb->reserved_resp_length =
ORB_SET_QUERY_LOGINS_RESP_LENGTH(
sizeof(struct sbp2_query_logins_response));
lu->query_logins_orb->status_fifo_hi =
ORB_SET_STATUS_FIFO_HI(lu->status_fifo_addr, hi->host->node_id);
lu->query_logins_orb->status_fifo_lo =
ORB_SET_STATUS_FIFO_LO(lu->status_fifo_addr);
sbp2util_cpu_to_be32_buffer(lu->query_logins_orb,
sizeof(struct sbp2_query_logins_orb));
memset(lu->query_logins_response, 0,
sizeof(struct sbp2_query_logins_response));
data[0] = ORB_SET_NODE_ID(hi->host->node_id);
data[1] = lu->query_logins_orb_dma;
sbp2util_cpu_to_be32_buffer(data, 8);
hpsb_node_write(lu->ne, lu->management_agent_addr, data, 8);
if (sbp2util_access_timeout(lu, 2*HZ)) {
SBP2_INFO("Error querying logins to SBP-2 device - timed out");
return -EIO;
}
if (lu->status_block.ORB_offset_lo != lu->query_logins_orb_dma) {
SBP2_INFO("Error querying logins to SBP-2 device - timed out");
return -EIO;
}
if (STATUS_TEST_RDS(lu->status_block.ORB_offset_hi_misc)) {
SBP2_INFO("Error querying logins to SBP-2 device - failed");
return -EIO;
}
sbp2util_cpu_to_be32_buffer(lu->query_logins_response,
sizeof(struct sbp2_query_logins_response));
max_logins = RESPONSE_GET_MAX_LOGINS(
lu->query_logins_response->length_max_logins);
SBP2_INFO("Maximum concurrent logins supported: %d", max_logins);
active_logins = RESPONSE_GET_ACTIVE_LOGINS(
lu->query_logins_response->length_max_logins);
SBP2_INFO("Number of active logins: %d", active_logins);
if (active_logins >= max_logins) {
return -EIO;
}
return 0;
}
static int sbp2_login_device(struct sbp2_lu *lu)
{
struct sbp2_fwhost_info *hi = lu->hi;
quadlet_t data[2];
if (!lu->login_orb)
return -EIO;
if (!sbp2_exclusive_login && sbp2_query_logins(lu)) {
SBP2_INFO("Device does not support any more concurrent logins");
return -EIO;
}
/* assume no password */
lu->login_orb->password_hi = 0;
lu->login_orb->password_lo = 0;
lu->login_orb->login_response_lo = lu->login_response_dma;
lu->login_orb->login_response_hi = ORB_SET_NODE_ID(hi->host->node_id);
lu->login_orb->lun_misc = ORB_SET_FUNCTION(SBP2_LOGIN_REQUEST);
/* one second reconnect time */
lu->login_orb->lun_misc |= ORB_SET_RECONNECT(0);
lu->login_orb->lun_misc |= ORB_SET_EXCLUSIVE(sbp2_exclusive_login);
lu->login_orb->lun_misc |= ORB_SET_NOTIFY(1);
lu->login_orb->lun_misc |= ORB_SET_LUN(lu->lun);
lu->login_orb->passwd_resp_lengths =
ORB_SET_LOGIN_RESP_LENGTH(sizeof(struct sbp2_login_response));
lu->login_orb->status_fifo_hi =
ORB_SET_STATUS_FIFO_HI(lu->status_fifo_addr, hi->host->node_id);
lu->login_orb->status_fifo_lo =
ORB_SET_STATUS_FIFO_LO(lu->status_fifo_addr);
sbp2util_cpu_to_be32_buffer(lu->login_orb,
sizeof(struct sbp2_login_orb));
memset(lu->login_response, 0, sizeof(struct sbp2_login_response));
data[0] = ORB_SET_NODE_ID(hi->host->node_id);
data[1] = lu->login_orb_dma;
sbp2util_cpu_to_be32_buffer(data, 8);
hpsb_node_write(lu->ne, lu->management_agent_addr, data, 8);
/* wait up to 20 seconds for login status */
if (sbp2util_access_timeout(lu, 20*HZ)) {
SBP2_ERR("Error logging into SBP-2 device - timed out");
return -EIO;
}
/* make sure that the returned status matches the login ORB */
if (lu->status_block.ORB_offset_lo != lu->login_orb_dma) {
SBP2_ERR("Error logging into SBP-2 device - timed out");
return -EIO;
}
if (STATUS_TEST_RDS(lu->status_block.ORB_offset_hi_misc)) {
SBP2_ERR("Error logging into SBP-2 device - failed");
return -EIO;
}
sbp2util_cpu_to_be32_buffer(lu->login_response,
sizeof(struct sbp2_login_response));
lu->command_block_agent_addr =
((u64)lu->login_response->command_block_agent_hi) << 32;
lu->command_block_agent_addr |=
((u64)lu->login_response->command_block_agent_lo);
lu->command_block_agent_addr &= 0x0000ffffffffffffULL;
SBP2_INFO("Logged into SBP-2 device");
return 0;
}
static int sbp2_logout_device(struct sbp2_lu *lu)
{
struct sbp2_fwhost_info *hi = lu->hi;
quadlet_t data[2];
int error;
lu->logout_orb->reserved1 = 0x0;
lu->logout_orb->reserved2 = 0x0;
lu->logout_orb->reserved3 = 0x0;
lu->logout_orb->reserved4 = 0x0;
lu->logout_orb->login_ID_misc = ORB_SET_FUNCTION(SBP2_LOGOUT_REQUEST);
lu->logout_orb->login_ID_misc |=
ORB_SET_LOGIN_ID(lu->login_response->length_login_ID);
lu->logout_orb->login_ID_misc |= ORB_SET_NOTIFY(1);
lu->logout_orb->reserved5 = 0x0;
lu->logout_orb->status_fifo_hi =
ORB_SET_STATUS_FIFO_HI(lu->status_fifo_addr, hi->host->node_id);
lu->logout_orb->status_fifo_lo =
ORB_SET_STATUS_FIFO_LO(lu->status_fifo_addr);
sbp2util_cpu_to_be32_buffer(lu->logout_orb,
sizeof(struct sbp2_logout_orb));
data[0] = ORB_SET_NODE_ID(hi->host->node_id);
data[1] = lu->logout_orb_dma;
sbp2util_cpu_to_be32_buffer(data, 8);
error = hpsb_node_write(lu->ne, lu->management_agent_addr, data, 8);
if (error)
return error;
/* wait up to 1 second for the device to complete logout */
if (sbp2util_access_timeout(lu, HZ))
return -EIO;
SBP2_INFO("Logged out of SBP-2 device");
return 0;
}
static int sbp2_reconnect_device(struct sbp2_lu *lu)
{
struct sbp2_fwhost_info *hi = lu->hi;
quadlet_t data[2];
int error;
lu->reconnect_orb->reserved1 = 0x0;
lu->reconnect_orb->reserved2 = 0x0;
lu->reconnect_orb->reserved3 = 0x0;
lu->reconnect_orb->reserved4 = 0x0;
lu->reconnect_orb->login_ID_misc =
ORB_SET_FUNCTION(SBP2_RECONNECT_REQUEST);
lu->reconnect_orb->login_ID_misc |=
ORB_SET_LOGIN_ID(lu->login_response->length_login_ID);
lu->reconnect_orb->login_ID_misc |= ORB_SET_NOTIFY(1);
lu->reconnect_orb->reserved5 = 0x0;
lu->reconnect_orb->status_fifo_hi =
ORB_SET_STATUS_FIFO_HI(lu->status_fifo_addr, hi->host->node_id);
lu->reconnect_orb->status_fifo_lo =
ORB_SET_STATUS_FIFO_LO(lu->status_fifo_addr);
sbp2util_cpu_to_be32_buffer(lu->reconnect_orb,
sizeof(struct sbp2_reconnect_orb));
data[0] = ORB_SET_NODE_ID(hi->host->node_id);
data[1] = lu->reconnect_orb_dma;
sbp2util_cpu_to_be32_buffer(data, 8);
error = hpsb_node_write(lu->ne, lu->management_agent_addr, data, 8);
if (error)
return error;
/* wait up to 1 second for reconnect status */
if (sbp2util_access_timeout(lu, HZ)) {
SBP2_ERR("Error reconnecting to SBP-2 device - timed out");
return -EIO;
}
/* make sure that the returned status matches the reconnect ORB */
if (lu->status_block.ORB_offset_lo != lu->reconnect_orb_dma) {
SBP2_ERR("Error reconnecting to SBP-2 device - timed out");
return -EIO;
}
if (STATUS_TEST_RDS(lu->status_block.ORB_offset_hi_misc)) {
SBP2_ERR("Error reconnecting to SBP-2 device - failed");
return -EIO;
}
SBP2_INFO("Reconnected to SBP-2 device");
return 0;
}
/*
* Set the target node's Single Phase Retry limit. Affects the target's retry
* behaviour if our node is too busy to accept requests.
*/
static int sbp2_set_busy_timeout(struct sbp2_lu *lu)
{
quadlet_t data;
data = cpu_to_be32(SBP2_BUSY_TIMEOUT_VALUE);
if (hpsb_node_write(lu->ne, SBP2_BUSY_TIMEOUT_ADDRESS, &data, 4))
SBP2_ERR("%s error", __func__);
return 0;
}
static void sbp2_parse_unit_directory(struct sbp2_lu *lu,
struct unit_directory *ud)
{
struct csr1212_keyval *kv;
struct csr1212_dentry *dentry;
u64 management_agent_addr;
u32 unit_characteristics, firmware_revision;
unsigned workarounds;
int i;
management_agent_addr = 0;
unit_characteristics = 0;
firmware_revision = 0;
csr1212_for_each_dir_entry(ud->ne->csr, kv, ud->ud_kv, dentry) {
switch (kv->key.id) {
case CSR1212_KV_ID_DEPENDENT_INFO:
if (kv->key.type == CSR1212_KV_TYPE_CSR_OFFSET)
management_agent_addr =
CSR1212_REGISTER_SPACE_BASE +
(kv->value.csr_offset << 2);
else if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE)
lu->lun = ORB_SET_LUN(kv->value.immediate);
break;
case SBP2_UNIT_CHARACTERISTICS_KEY:
/* FIXME: This is ignored so far.
* See SBP-2 clause 7.4.8. */
unit_characteristics = kv->value.immediate;
break;
case SBP2_FIRMWARE_REVISION_KEY:
firmware_revision = kv->value.immediate;
break;
default:
/* FIXME: Check for SBP2_DEVICE_TYPE_AND_LUN_KEY.
* Its "ordered" bit has consequences for command ORB
* list handling. See SBP-2 clauses 4.6, 7.4.11, 10.2 */
break;
}
}
workarounds = sbp2_default_workarounds;
if (!(workarounds & SBP2_WORKAROUND_OVERRIDE))
for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
if (sbp2_workarounds_table[i].firmware_revision !=
SBP2_ROM_VALUE_WILDCARD &&
sbp2_workarounds_table[i].firmware_revision !=
(firmware_revision & 0xffff00))
continue;
if (sbp2_workarounds_table[i].model_id !=
SBP2_ROM_VALUE_WILDCARD &&
sbp2_workarounds_table[i].model_id != ud->model_id)
continue;
workarounds |= sbp2_workarounds_table[i].workarounds;
break;
}
if (workarounds)
SBP2_INFO("Workarounds for node " NODE_BUS_FMT ": 0x%x "
"(firmware_revision 0x%06x, vendor_id 0x%06x,"
" model_id 0x%06x)",
NODE_BUS_ARGS(ud->ne->host, ud->ne->nodeid),
workarounds, firmware_revision,
ud->vendor_id ? ud->vendor_id : ud->ne->vendor_id,
ud->model_id);
/* We would need one SCSI host template for each target to adjust
* max_sectors on the fly, therefore warn only. */
if (workarounds & SBP2_WORKAROUND_128K_MAX_TRANS &&
(sbp2_max_sectors * 512) > (128 * 1024))
SBP2_INFO("Node " NODE_BUS_FMT ": Bridge only supports 128KB "
"max transfer size. WARNING: Current max_sectors "
"setting is larger than 128KB (%d sectors)",
NODE_BUS_ARGS(ud->ne->host, ud->ne->nodeid),
sbp2_max_sectors);
/* If this is a logical unit directory entry, process the parent
* to get the values. */
if (ud->flags & UNIT_DIRECTORY_LUN_DIRECTORY) {
struct unit_directory *parent_ud = container_of(
ud->device.parent, struct unit_directory, device);
sbp2_parse_unit_directory(lu, parent_ud);
} else {
lu->management_agent_addr = management_agent_addr;
lu->workarounds = workarounds;
if (ud->flags & UNIT_DIRECTORY_HAS_LUN)
lu->lun = ORB_SET_LUN(ud->lun);
}
}
#define SBP2_PAYLOAD_TO_BYTES(p) (1 << ((p) + 2))
/*
* This function is called in order to determine the max speed and packet
* size we can use in our ORBs. Note, that we (the driver and host) only
* initiate the transaction. The SBP-2 device actually transfers the data
* (by reading from the DMA area we tell it). This means that the SBP-2
* device decides the actual maximum data it can transfer. We just tell it
* the speed that it needs to use, and the max_rec the host supports, and
* it takes care of the rest.
*/
static int sbp2_max_speed_and_size(struct sbp2_lu *lu)
{
struct sbp2_fwhost_info *hi = lu->hi;
u8 payload;
lu->speed_code = hi->host->speed[NODEID_TO_NODE(lu->ne->nodeid)];
if (lu->speed_code > sbp2_max_speed) {
lu->speed_code = sbp2_max_speed;
SBP2_INFO("Reducing speed to %s",
hpsb_speedto_str[sbp2_max_speed]);
}
/* Payload size is the lesser of what our speed supports and what
* our host supports. */
payload = min(sbp2_speedto_max_payload[lu->speed_code],
(u8) (hi->host->csr.max_rec - 1));
/* If physical DMA is off, work around limitation in ohci1394:
* packet size must not exceed PAGE_SIZE */
if (lu->ne->host->low_addr_space < (1ULL << 32))
while (SBP2_PAYLOAD_TO_BYTES(payload) + 24 > PAGE_SIZE &&
payload)
payload--;
SBP2_INFO("Node " NODE_BUS_FMT ": Max speed [%s] - Max payload [%u]",
NODE_BUS_ARGS(hi->host, lu->ne->nodeid),
hpsb_speedto_str[lu->speed_code],
SBP2_PAYLOAD_TO_BYTES(payload));
lu->max_payload_size = payload;
return 0;
}
static int sbp2_agent_reset(struct sbp2_lu *lu, int wait)
{
quadlet_t data;
u64 addr;
int retval;
unsigned long flags;
/* flush lu->protocol_work */
if (wait)
flush_scheduled_work();
data = ntohl(SBP2_AGENT_RESET_DATA);
addr = lu->command_block_agent_addr + SBP2_AGENT_RESET_OFFSET;
if (wait)
retval = hpsb_node_write(lu->ne, addr, &data, 4);
else
retval = sbp2util_node_write_no_wait(lu->ne, addr, &data, 4);
if (retval < 0) {
SBP2_ERR("hpsb_node_write failed.\n");
return -EIO;
}
/* make sure that the ORB_POINTER is written on next command */
spin_lock_irqsave(&lu->cmd_orb_lock, flags);
lu->last_orb = NULL;
spin_unlock_irqrestore(&lu->cmd_orb_lock, flags);
return 0;
}
static int sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb,
struct sbp2_fwhost_info *hi,
struct sbp2_command_info *cmd,
unsigned int sg_count,
struct scatterlist *sg,
u32 orb_direction,
enum dma_data_direction dma_dir)
{
struct device *dmadev = hi->host->device.parent;
struct sbp2_unrestricted_page_table *pt;
int i, n;
n = dma_map_sg(dmadev, sg, sg_count, dma_dir);
if (n == 0)
return -ENOMEM;
orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id);
orb->misc |= ORB_SET_DIRECTION(orb_direction);
/* special case if only one element (and less than 64KB in size) */
if (n == 1) {
orb->misc |= ORB_SET_DATA_SIZE(sg_dma_len(sg));
orb->data_descriptor_lo = sg_dma_address(sg);
} else {
pt = &cmd->scatter_gather_element[0];
dma_sync_single_for_cpu(dmadev, cmd->sge_dma,
sizeof(cmd->scatter_gather_element),
DMA_TO_DEVICE);
for_each_sg(sg, sg, n, i) {
pt[i].high = cpu_to_be32(sg_dma_len(sg) << 16);
pt[i].low = cpu_to_be32(sg_dma_address(sg));
}
orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1) |
ORB_SET_DATA_SIZE(n);
orb->data_descriptor_lo = cmd->sge_dma;
dma_sync_single_for_device(dmadev, cmd->sge_dma,
sizeof(cmd->scatter_gather_element),
DMA_TO_DEVICE);
}
return 0;
}
static int sbp2_create_command_orb(struct sbp2_lu *lu,
struct sbp2_command_info *cmd,
struct scsi_cmnd *SCpnt)
{
struct device *dmadev = lu->hi->host->device.parent;
struct sbp2_command_orb *orb = &cmd->command_orb;
unsigned int scsi_request_bufflen = scsi_bufflen(SCpnt);
enum dma_data_direction dma_dir = SCpnt->sc_data_direction;
u32 orb_direction;
int ret;
dma_sync_single_for_cpu(dmadev, cmd->command_orb_dma,
sizeof(struct sbp2_command_orb), DMA_TO_DEVICE);
/*
* Set-up our command ORB.
*
* NOTE: We're doing unrestricted page tables (s/g), as this is
* best performance (at least with the devices I have). This means
* that data_size becomes the number of s/g elements, and
* page_size should be zero (for unrestricted).
*/
orb->next_ORB_hi = ORB_SET_NULL_PTR(1);
orb->next_ORB_lo = 0x0;
orb->misc = ORB_SET_MAX_PAYLOAD(lu->max_payload_size);
orb->misc |= ORB_SET_SPEED(lu->speed_code);
orb->misc |= ORB_SET_NOTIFY(1);
if (dma_dir == DMA_NONE)
orb_direction = ORB_DIRECTION_NO_DATA_TRANSFER;
else if (dma_dir == DMA_TO_DEVICE && scsi_request_bufflen)
orb_direction = ORB_DIRECTION_WRITE_TO_MEDIA;
else if (dma_dir == DMA_FROM_DEVICE && scsi_request_bufflen)
orb_direction = ORB_DIRECTION_READ_FROM_MEDIA;
else {
SBP2_INFO("Falling back to DMA_NONE");
orb_direction = ORB_DIRECTION_NO_DATA_TRANSFER;
}
/* set up our page table stuff */
if (orb_direction == ORB_DIRECTION_NO_DATA_TRANSFER) {
orb->data_descriptor_hi = 0x0;
orb->data_descriptor_lo = 0x0;
orb->misc |= ORB_SET_DIRECTION(1);
ret = 0;
} else {
ret = sbp2_prep_command_orb_sg(orb, lu->hi, cmd,
scsi_sg_count(SCpnt),
scsi_sglist(SCpnt),
orb_direction, dma_dir);
}
sbp2util_cpu_to_be32_buffer(orb, sizeof(*orb));
memset(orb->cdb, 0, sizeof(orb->cdb));
memcpy(orb->cdb, SCpnt->cmnd, SCpnt->cmd_len);
dma_sync_single_for_device(dmadev, cmd->command_orb_dma,
sizeof(struct sbp2_command_orb), DMA_TO_DEVICE);
return ret;
}
static void sbp2_link_orb_command(struct sbp2_lu *lu,
struct sbp2_command_info *cmd)
{
struct sbp2_fwhost_info *hi = lu->hi;
struct sbp2_command_orb *last_orb;
dma_addr_t last_orb_dma;
u64 addr = lu->command_block_agent_addr;
quadlet_t data[2];
size_t length;
unsigned long flags;
/* check to see if there are any previous orbs to use */
spin_lock_irqsave(&lu->cmd_orb_lock, flags);
last_orb = lu->last_orb;
last_orb_dma = lu->last_orb_dma;
if (!last_orb) {
/*
* last_orb == NULL means: We know that the target's fetch agent
* is not active right now.
*/
addr += SBP2_ORB_POINTER_OFFSET;
data[0] = ORB_SET_NODE_ID(hi->host->node_id);
data[1] = cmd->command_orb_dma;
sbp2util_cpu_to_be32_buffer(data, 8);
length = 8;
} else {
/*
* last_orb != NULL means: We know that the target's fetch agent
* is (very probably) not dead or in reset state right now.
* We have an ORB already sent that we can append a new one to.
* The target's fetch agent may or may not have read this
* previous ORB yet.
*/
dma_sync_single_for_cpu(hi->host->device.parent, last_orb_dma,
sizeof(struct sbp2_command_orb),
DMA_TO_DEVICE);
last_orb->next_ORB_lo = cpu_to_be32(cmd->command_orb_dma);
wmb();
/* Tells hardware that this pointer is valid */
last_orb->next_ORB_hi = 0;
dma_sync_single_for_device(hi->host->device.parent,
last_orb_dma,
sizeof(struct sbp2_command_orb),
DMA_TO_DEVICE);
addr += SBP2_DOORBELL_OFFSET;
data[0] = 0;
length = 4;
}
lu->last_orb = &cmd->command_orb;
lu->last_orb_dma = cmd->command_orb_dma;
spin_unlock_irqrestore(&lu->cmd_orb_lock, flags);
if (sbp2util_node_write_no_wait(lu->ne, addr, data, length)) {
/*
* sbp2util_node_write_no_wait failed. We certainly ran out
* of transaction labels, perhaps just because there were no
* context switches which gave khpsbpkt a chance to collect
* free tlabels. Try again in non-atomic context. If necessary,
* the workqueue job will sleep to guaranteedly get a tlabel.
* We do not accept new commands until the job is over.
*/
scsi_block_requests(lu->shost);
PREPARE_WORK(&lu->protocol_work,
last_orb ? sbp2util_write_doorbell:
sbp2util_write_orb_pointer);
schedule_work(&lu->protocol_work);
}
}
static int sbp2_send_command(struct sbp2_lu *lu, struct scsi_cmnd *SCpnt,
void (*done)(struct scsi_cmnd *))
{
struct sbp2_command_info *cmd;
cmd = sbp2util_allocate_command_orb(lu, SCpnt, done);
if (!cmd)
return -EIO;
if (sbp2_create_command_orb(lu, cmd, SCpnt))
return -ENOMEM;
sbp2_link_orb_command(lu, cmd);
return 0;
}
/*
* Translates SBP-2 status into SCSI sense data for check conditions
*/
static unsigned int sbp2_status_to_sense_data(unchar *sbp2_status,
unchar *sense_data)
{
/* OK, it's pretty ugly... ;-) */
sense_data[0] = 0x70;
sense_data[1] = 0x0;
sense_data[2] = sbp2_status[9];
sense_data[3] = sbp2_status[12];
sense_data[4] = sbp2_status[13];
sense_data[5] = sbp2_status[14];
sense_data[6] = sbp2_status[15];
sense_data[7] = 10;
sense_data[8] = sbp2_status[16];
sense_data[9] = sbp2_status[17];
sense_data[10] = sbp2_status[18];
sense_data[11] = sbp2_status[19];
sense_data[12] = sbp2_status[10];
sense_data[13] = sbp2_status[11];
sense_data[14] = sbp2_status[20];
sense_data[15] = sbp2_status[21];
return sbp2_status[8] & 0x3f;
}
static int sbp2_handle_status_write(struct hpsb_host *host, int nodeid,
int destid, quadlet_t *data, u64 addr,
size_t length, u16 fl)
{
struct sbp2_fwhost_info *hi;
struct sbp2_lu *lu = NULL, *lu_tmp;
struct scsi_cmnd *SCpnt = NULL;
struct sbp2_status_block *sb;
u32 scsi_status = SBP2_SCSI_STATUS_GOOD;
struct sbp2_command_info *cmd;
unsigned long flags;
if (unlikely(length < 8 || length > sizeof(struct sbp2_status_block))) {
SBP2_ERR("Wrong size of status block");
return RCODE_ADDRESS_ERROR;
}
if (unlikely(!host)) {
SBP2_ERR("host is NULL - this is bad!");
return RCODE_ADDRESS_ERROR;
}
hi = hpsb_get_hostinfo(&sbp2_highlevel, host);
if (unlikely(!hi)) {
SBP2_ERR("host info is NULL - this is bad!");
return RCODE_ADDRESS_ERROR;
}
/* Find the unit which wrote the status. */
read_lock_irqsave(&sbp2_hi_logical_units_lock, flags);
list_for_each_entry(lu_tmp, &hi->logical_units, lu_list) {
if (lu_tmp->ne->nodeid == nodeid &&
lu_tmp->status_fifo_addr == addr) {
lu = lu_tmp;
break;
}
}
read_unlock_irqrestore(&sbp2_hi_logical_units_lock, flags);
if (unlikely(!lu)) {
SBP2_ERR("lu is NULL - device is gone?");
return RCODE_ADDRESS_ERROR;
}
/* Put response into lu status fifo buffer. The first two bytes
* come in big endian bit order. Often the target writes only a
* truncated status block, minimally the first two quadlets. The rest
* is implied to be zeros. */
sb = &lu->status_block;
memset(sb->command_set_dependent, 0, sizeof(sb->command_set_dependent));
memcpy(sb, data, length);
sbp2util_be32_to_cpu_buffer(sb, 8);
/* Ignore unsolicited status. Handle command ORB status. */
if (unlikely(STATUS_GET_SRC(sb->ORB_offset_hi_misc) == 2))
cmd = NULL;
else
cmd = sbp2util_find_command_for_orb(lu, sb->ORB_offset_lo);
if (cmd) {
/* Grab SCSI command pointers and check status. */
/*
* FIXME: If the src field in the status is 1, the ORB DMA must
* not be reused until status for a subsequent ORB is received.
*/
SCpnt = cmd->Current_SCpnt;
spin_lock_irqsave(&lu->cmd_orb_lock, flags);
sbp2util_mark_command_completed(lu, cmd);
spin_unlock_irqrestore(&lu->cmd_orb_lock, flags);
if (SCpnt) {
u32 h = sb->ORB_offset_hi_misc;
u32 r = STATUS_GET_RESP(h);
if (r != RESP_STATUS_REQUEST_COMPLETE) {
SBP2_INFO("resp 0x%x, sbp_status 0x%x",
r, STATUS_GET_SBP_STATUS(h));
scsi_status =
r == RESP_STATUS_TRANSPORT_FAILURE ?
SBP2_SCSI_STATUS_BUSY :
SBP2_SCSI_STATUS_COMMAND_TERMINATED;
}
if (STATUS_GET_LEN(h) > 1)
scsi_status = sbp2_status_to_sense_data(
(unchar *)sb, SCpnt->sense_buffer);
if (STATUS_TEST_DEAD(h))
sbp2_agent_reset(lu, 0);
}
/* Check here to see if there are no commands in-use. If there
* are none, we know that the fetch agent left the active state
* _and_ that we did not reactivate it yet. Therefore clear
* last_orb so that next time we write directly to the
* ORB_POINTER register. That way the fetch agent does not need
* to refetch the next_ORB. */
spin_lock_irqsave(&lu->cmd_orb_lock, flags);
if (list_empty(&lu->cmd_orb_inuse))
lu->last_orb = NULL;
spin_unlock_irqrestore(&lu->cmd_orb_lock, flags);
} else {
/* It's probably status after a management request. */
if ((sb->ORB_offset_lo == lu->reconnect_orb_dma) ||
(sb->ORB_offset_lo == lu->login_orb_dma) ||
(sb->ORB_offset_lo == lu->query_logins_orb_dma) ||
(sb->ORB_offset_lo == lu->logout_orb_dma)) {
lu->access_complete = 1;
wake_up_interruptible(&sbp2_access_wq);
}
}
if (SCpnt)
sbp2scsi_complete_command(lu, scsi_status, SCpnt,
cmd->Current_done);
return RCODE_COMPLETE;
}
/**************************************
* SCSI interface related section
**************************************/
static int sbp2scsi_queuecommand(struct scsi_cmnd *SCpnt,
void (*done)(struct scsi_cmnd *))
{
struct sbp2_lu *lu = (struct sbp2_lu *)SCpnt->device->host->hostdata[0];
struct sbp2_fwhost_info *hi;
int result = DID_NO_CONNECT << 16;
if (unlikely(!sbp2util_node_is_available(lu)))
goto done;
hi = lu->hi;
if (unlikely(!hi)) {
SBP2_ERR("sbp2_fwhost_info is NULL - this is bad!");
goto done;
}
/* Multiple units are currently represented to the SCSI core as separate
* targets, not as one target with multiple LUs. Therefore return
* selection time-out to any IO directed at non-zero LUNs. */
if (unlikely(SCpnt->device->lun))
goto done;
if (unlikely(!hpsb_node_entry_valid(lu->ne))) {
SBP2_ERR("Bus reset in progress - rejecting command");
result = DID_BUS_BUSY << 16;
goto done;
}
/* Bidirectional commands are not yet implemented,
* and unknown transfer direction not handled. */
if (unlikely(SCpnt->sc_data_direction == DMA_BIDIRECTIONAL)) {
SBP2_ERR("Cannot handle DMA_BIDIRECTIONAL - rejecting command");
result = DID_ERROR << 16;
goto done;
}
if (sbp2_send_command(lu, SCpnt, done)) {
SBP2_ERR("Error sending SCSI command");
sbp2scsi_complete_command(lu,
SBP2_SCSI_STATUS_SELECTION_TIMEOUT,
SCpnt, done);
}
return 0;
done:
SCpnt->result = result;
done(SCpnt);
return 0;
}
static void sbp2scsi_complete_all_commands(struct sbp2_lu *lu, u32 status)
{
struct list_head *lh;
struct sbp2_command_info *cmd;
unsigned long flags;
spin_lock_irqsave(&lu->cmd_orb_lock, flags);
while (!list_empty(&lu->cmd_orb_inuse)) {
lh = lu->cmd_orb_inuse.next;
cmd = list_entry(lh, struct sbp2_command_info, list);
sbp2util_mark_command_completed(lu, cmd);
if (cmd->Current_SCpnt) {
cmd->Current_SCpnt->result = status << 16;
cmd->Current_done(cmd->Current_SCpnt);
}
}
spin_unlock_irqrestore(&lu->cmd_orb_lock, flags);
return;
}
/*
* Complete a regular SCSI command. Can be called in atomic context.
*/
static void sbp2scsi_complete_command(struct sbp2_lu *lu, u32 scsi_status,
struct scsi_cmnd *SCpnt,
void (*done)(struct scsi_cmnd *))
{
if (!SCpnt) {
SBP2_ERR("SCpnt is NULL");
return;
}
switch (scsi_status) {
case SBP2_SCSI_STATUS_GOOD:
SCpnt->result = DID_OK << 16;
break;
case SBP2_SCSI_STATUS_BUSY:
SBP2_ERR("SBP2_SCSI_STATUS_BUSY");
SCpnt->result = DID_BUS_BUSY << 16;
break;
case SBP2_SCSI_STATUS_CHECK_CONDITION:
SCpnt->result = CHECK_CONDITION << 1 | DID_OK << 16;
break;
case SBP2_SCSI_STATUS_SELECTION_TIMEOUT:
SBP2_ERR("SBP2_SCSI_STATUS_SELECTION_TIMEOUT");
SCpnt->result = DID_NO_CONNECT << 16;
scsi_print_command(SCpnt);
break;
case SBP2_SCSI_STATUS_CONDITION_MET:
case SBP2_SCSI_STATUS_RESERVATION_CONFLICT:
case SBP2_SCSI_STATUS_COMMAND_TERMINATED:
SBP2_ERR("Bad SCSI status = %x", scsi_status);
SCpnt->result = DID_ERROR << 16;
scsi_print_command(SCpnt);
break;
default:
SBP2_ERR("Unsupported SCSI status = %x", scsi_status);
SCpnt->result = DID_ERROR << 16;
}
/* If a bus reset is in progress and there was an error, complete
* the command as busy so that it will get retried. */
if (!hpsb_node_entry_valid(lu->ne)
&& (scsi_status != SBP2_SCSI_STATUS_GOOD)) {
SBP2_ERR("Completing command with busy (bus reset)");
SCpnt->result = DID_BUS_BUSY << 16;
}
/* Tell the SCSI stack that we're done with this command. */
done(SCpnt);
}
static int sbp2scsi_slave_alloc(struct scsi_device *sdev)
{
struct sbp2_lu *lu = (struct sbp2_lu *)sdev->host->hostdata[0];
if (sdev->lun != 0 || sdev->id != lu->ud->id || sdev->channel != 0)
return -ENODEV;
lu->sdev = sdev;
sdev->allow_restart = 1;
/* SBP-2 requires quadlet alignment of the data buffers. */
blk_queue_update_dma_alignment(sdev->request_queue, 4 - 1);
if (lu->workarounds & SBP2_WORKAROUND_INQUIRY_36)
sdev->inquiry_len = 36;
return 0;
}
static int sbp2scsi_slave_configure(struct scsi_device *sdev)
{
struct sbp2_lu *lu = (struct sbp2_lu *)sdev->host->hostdata[0];
sdev->use_10_for_rw = 1;
if (sbp2_exclusive_login)
sdev->manage_start_stop = 1;
if (sdev->type == TYPE_ROM)
sdev->use_10_for_ms = 1;
if (sdev->type == TYPE_DISK &&
lu->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
sdev->skip_ms_page_8 = 1;
if (lu->workarounds & SBP2_WORKAROUND_FIX_CAPACITY)
sdev->fix_capacity = 1;
if (lu->workarounds & SBP2_WORKAROUND_POWER_CONDITION)
sdev->start_stop_pwr_cond = 1;
if (lu->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS)
blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512);
blk_queue_max_segment_size(sdev->request_queue, SBP2_MAX_SEG_SIZE);
return 0;
}
static void sbp2scsi_slave_destroy(struct scsi_device *sdev)
{
((struct sbp2_lu *)sdev->host->hostdata[0])->sdev = NULL;
return;
}
/*
* Called by scsi stack when something has really gone wrong.
* Usually called when a command has timed-out for some reason.
*/
static int sbp2scsi_abort(struct scsi_cmnd *SCpnt)
{
struct sbp2_lu *lu = (struct sbp2_lu *)SCpnt->device->host->hostdata[0];
struct sbp2_command_info *cmd;
unsigned long flags;
SBP2_INFO("aborting sbp2 command");
scsi_print_command(SCpnt);
if (sbp2util_node_is_available(lu)) {
sbp2_agent_reset(lu, 1);
/* Return a matching command structure to the free pool. */
spin_lock_irqsave(&lu->cmd_orb_lock, flags);
cmd = sbp2util_find_command_for_SCpnt(lu, SCpnt);
if (cmd) {
sbp2util_mark_command_completed(lu, cmd);
if (cmd->Current_SCpnt) {
cmd->Current_SCpnt->result = DID_ABORT << 16;
cmd->Current_done(cmd->Current_SCpnt);
}
}
spin_unlock_irqrestore(&lu->cmd_orb_lock, flags);
sbp2scsi_complete_all_commands(lu, DID_BUS_BUSY);
}
return SUCCESS;
}
/*
* Called by scsi stack when something has really gone wrong.
*/
static int sbp2scsi_reset(struct scsi_cmnd *SCpnt)
{
struct sbp2_lu *lu = (struct sbp2_lu *)SCpnt->device->host->hostdata[0];
SBP2_INFO("reset requested");
if (sbp2util_node_is_available(lu)) {
SBP2_INFO("generating sbp2 fetch agent reset");
sbp2_agent_reset(lu, 1);
}
return SUCCESS;
}
static ssize_t sbp2_sysfs_ieee1394_id_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct scsi_device *sdev;
struct sbp2_lu *lu;
if (!(sdev = to_scsi_device(dev)))
return 0;
if (!(lu = (struct sbp2_lu *)sdev->host->hostdata[0]))
return 0;
if (sbp2_long_sysfs_ieee1394_id)
return sprintf(buf, "%016Lx:%06x:%04x\n",
(unsigned long long)lu->ne->guid,
lu->ud->directory_id, ORB_SET_LUN(lu->lun));
else
return sprintf(buf, "%016Lx:%d:%d\n",
(unsigned long long)lu->ne->guid,
lu->ud->id, ORB_SET_LUN(lu->lun));
}
MODULE_AUTHOR("Ben Collins <bcollins@debian.org>");
MODULE_DESCRIPTION("IEEE-1394 SBP-2 protocol driver");
MODULE_SUPPORTED_DEVICE(SBP2_DEVICE_NAME);
MODULE_LICENSE("GPL");
static int sbp2_module_init(void)
{
int ret;
if (sbp2_serialize_io) {
sbp2_shost_template.can_queue = 1;
sbp2_shost_template.cmd_per_lun = 1;
}
sbp2_shost_template.max_sectors = sbp2_max_sectors;
hpsb_register_highlevel(&sbp2_highlevel);
ret = hpsb_register_protocol(&sbp2_driver);
if (ret) {
SBP2_ERR("Failed to register protocol");
hpsb_unregister_highlevel(&sbp2_highlevel);
return ret;
}
return 0;
}
static void __exit sbp2_module_exit(void)
{
hpsb_unregister_protocol(&sbp2_driver);
hpsb_unregister_highlevel(&sbp2_highlevel);
}
module_init(sbp2_module_init);
module_exit(sbp2_module_exit);
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