f746072abc
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
1645 lines
47 KiB
C
1645 lines
47 KiB
C
/*
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* SBP2 driver (SCSI over IEEE1394)
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*
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* Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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* The basic structure of this driver is based on the old storage driver,
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* drivers/ieee1394/sbp2.c, originally written by
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* James Goodwin <jamesg@filanet.com>
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* with later contributions and ongoing maintenance from
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* Ben Collins <bcollins@debian.org>,
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* Stefan Richter <stefanr@s5r6.in-berlin.de>
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* and many others.
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*/
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#include <linux/blkdev.h>
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#include <linux/bug.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/kernel.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/scatterlist.h>
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#include <linux/string.h>
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#include <linux/stringify.h>
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#include <linux/timer.h>
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#include <linux/workqueue.h>
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#include <asm/system.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#include "fw-device.h"
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#include "fw-topology.h"
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#include "fw-transaction.h"
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/*
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* So far only bridges from Oxford Semiconductor are known to support
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* concurrent logins. Depending on firmware, four or two concurrent logins
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* are possible on OXFW911 and newer Oxsemi bridges.
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*
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* Concurrent logins are useful together with cluster filesystems.
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*/
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static int sbp2_param_exclusive_login = 1;
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module_param_named(exclusive_login, sbp2_param_exclusive_login, bool, 0644);
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MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device "
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"(default = Y, use N for concurrent initiators)");
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/*
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* Flags for firmware oddities
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*
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* - 128kB max transfer
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* Limit transfer size. Necessary for some old bridges.
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*
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* - 36 byte inquiry
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* When scsi_mod probes the device, let the inquiry command look like that
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* from MS Windows.
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*
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* - skip mode page 8
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* Suppress sending of mode_sense for mode page 8 if the device pretends to
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* support the SCSI Primary Block commands instead of Reduced Block Commands.
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*
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* - fix capacity
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* Tell sd_mod to correct the last sector number reported by read_capacity.
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* Avoids access beyond actual disk limits on devices with an off-by-one bug.
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* Don't use this with devices which don't have this bug.
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*
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* - delay inquiry
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* Wait extra SBP2_INQUIRY_DELAY seconds after login before SCSI inquiry.
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*
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* - power condition
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* Set the power condition field in the START STOP UNIT commands sent by
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* sd_mod on suspend, resume, and shutdown (if manage_start_stop is on).
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* Some disks need this to spin down or to resume properly.
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*
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* - override internal blacklist
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* Instead of adding to the built-in blacklist, use only the workarounds
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* specified in the module load parameter.
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* Useful if a blacklist entry interfered with a non-broken device.
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*/
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#define SBP2_WORKAROUND_128K_MAX_TRANS 0x1
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#define SBP2_WORKAROUND_INQUIRY_36 0x2
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#define SBP2_WORKAROUND_MODE_SENSE_8 0x4
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#define SBP2_WORKAROUND_FIX_CAPACITY 0x8
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#define SBP2_WORKAROUND_DELAY_INQUIRY 0x10
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#define SBP2_INQUIRY_DELAY 12
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#define SBP2_WORKAROUND_POWER_CONDITION 0x20
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#define SBP2_WORKAROUND_OVERRIDE 0x100
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static int sbp2_param_workarounds;
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module_param_named(workarounds, sbp2_param_workarounds, int, 0644);
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MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0"
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", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS)
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", 36 byte inquiry = " __stringify(SBP2_WORKAROUND_INQUIRY_36)
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", skip mode page 8 = " __stringify(SBP2_WORKAROUND_MODE_SENSE_8)
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", fix capacity = " __stringify(SBP2_WORKAROUND_FIX_CAPACITY)
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", delay inquiry = " __stringify(SBP2_WORKAROUND_DELAY_INQUIRY)
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", set power condition in start stop unit = "
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__stringify(SBP2_WORKAROUND_POWER_CONDITION)
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", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE)
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", or a combination)");
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/* I don't know why the SCSI stack doesn't define something like this... */
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typedef void (*scsi_done_fn_t)(struct scsi_cmnd *);
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static const char sbp2_driver_name[] = "sbp2";
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/*
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* We create one struct sbp2_logical_unit per SBP-2 Logical Unit Number Entry
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* and one struct scsi_device per sbp2_logical_unit.
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*/
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struct sbp2_logical_unit {
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struct sbp2_target *tgt;
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struct list_head link;
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struct fw_address_handler address_handler;
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struct list_head orb_list;
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u64 command_block_agent_address;
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u16 lun;
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int login_id;
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/*
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* The generation is updated once we've logged in or reconnected
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* to the logical unit. Thus, I/O to the device will automatically
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* fail and get retried if it happens in a window where the device
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* is not ready, e.g. after a bus reset but before we reconnect.
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*/
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int generation;
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int retries;
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struct delayed_work work;
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bool has_sdev;
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bool blocked;
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};
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/*
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* We create one struct sbp2_target per IEEE 1212 Unit Directory
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* and one struct Scsi_Host per sbp2_target.
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*/
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struct sbp2_target {
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struct kref kref;
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struct fw_unit *unit;
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const char *bus_id;
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struct list_head lu_list;
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u64 management_agent_address;
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u64 guid;
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int directory_id;
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int node_id;
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int address_high;
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unsigned int workarounds;
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unsigned int mgt_orb_timeout;
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unsigned int max_payload;
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int dont_block; /* counter for each logical unit */
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int blocked; /* ditto */
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};
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/* Impossible login_id, to detect logout attempt before successful login */
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#define INVALID_LOGIN_ID 0x10000
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/*
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* Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be
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* provided in the config rom. Most devices do provide a value, which
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* we'll use for login management orbs, but with some sane limits.
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*/
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#define SBP2_MIN_LOGIN_ORB_TIMEOUT 5000U /* Timeout in ms */
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#define SBP2_MAX_LOGIN_ORB_TIMEOUT 40000U /* Timeout in ms */
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#define SBP2_ORB_TIMEOUT 2000U /* Timeout in ms */
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#define SBP2_ORB_NULL 0x80000000
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#define SBP2_RETRY_LIMIT 0xf /* 15 retries */
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#define SBP2_CYCLE_LIMIT (0xc8 << 12) /* 200 125us cycles */
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/*
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* The default maximum s/g segment size of a FireWire controller is
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* usually 0x10000, but SBP-2 only allows 0xffff. Since buffers have to
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* be quadlet-aligned, we set the length limit to 0xffff & ~3.
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*/
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#define SBP2_MAX_SEG_SIZE 0xfffc
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/* Unit directory keys */
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#define SBP2_CSR_UNIT_CHARACTERISTICS 0x3a
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#define SBP2_CSR_FIRMWARE_REVISION 0x3c
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#define SBP2_CSR_LOGICAL_UNIT_NUMBER 0x14
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#define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4
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/* Management orb opcodes */
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#define SBP2_LOGIN_REQUEST 0x0
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#define SBP2_QUERY_LOGINS_REQUEST 0x1
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#define SBP2_RECONNECT_REQUEST 0x3
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#define SBP2_SET_PASSWORD_REQUEST 0x4
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#define SBP2_LOGOUT_REQUEST 0x7
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#define SBP2_ABORT_TASK_REQUEST 0xb
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#define SBP2_ABORT_TASK_SET 0xc
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#define SBP2_LOGICAL_UNIT_RESET 0xe
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#define SBP2_TARGET_RESET_REQUEST 0xf
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/* Offsets for command block agent registers */
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#define SBP2_AGENT_STATE 0x00
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#define SBP2_AGENT_RESET 0x04
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#define SBP2_ORB_POINTER 0x08
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#define SBP2_DOORBELL 0x10
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#define SBP2_UNSOLICITED_STATUS_ENABLE 0x14
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/* Status write response codes */
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#define SBP2_STATUS_REQUEST_COMPLETE 0x0
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#define SBP2_STATUS_TRANSPORT_FAILURE 0x1
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#define SBP2_STATUS_ILLEGAL_REQUEST 0x2
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#define SBP2_STATUS_VENDOR_DEPENDENT 0x3
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#define STATUS_GET_ORB_HIGH(v) ((v).status & 0xffff)
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#define STATUS_GET_SBP_STATUS(v) (((v).status >> 16) & 0xff)
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#define STATUS_GET_LEN(v) (((v).status >> 24) & 0x07)
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#define STATUS_GET_DEAD(v) (((v).status >> 27) & 0x01)
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#define STATUS_GET_RESPONSE(v) (((v).status >> 28) & 0x03)
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#define STATUS_GET_SOURCE(v) (((v).status >> 30) & 0x03)
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#define STATUS_GET_ORB_LOW(v) ((v).orb_low)
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#define STATUS_GET_DATA(v) ((v).data)
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struct sbp2_status {
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u32 status;
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u32 orb_low;
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u8 data[24];
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};
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struct sbp2_pointer {
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__be32 high;
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__be32 low;
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};
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struct sbp2_orb {
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struct fw_transaction t;
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struct kref kref;
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dma_addr_t request_bus;
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int rcode;
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struct sbp2_pointer pointer;
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void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status);
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struct list_head link;
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};
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#define MANAGEMENT_ORB_LUN(v) ((v))
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#define MANAGEMENT_ORB_FUNCTION(v) ((v) << 16)
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#define MANAGEMENT_ORB_RECONNECT(v) ((v) << 20)
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#define MANAGEMENT_ORB_EXCLUSIVE(v) ((v) ? 1 << 28 : 0)
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#define MANAGEMENT_ORB_REQUEST_FORMAT(v) ((v) << 29)
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#define MANAGEMENT_ORB_NOTIFY ((1) << 31)
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#define MANAGEMENT_ORB_RESPONSE_LENGTH(v) ((v))
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#define MANAGEMENT_ORB_PASSWORD_LENGTH(v) ((v) << 16)
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struct sbp2_management_orb {
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struct sbp2_orb base;
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struct {
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struct sbp2_pointer password;
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struct sbp2_pointer response;
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__be32 misc;
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__be32 length;
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struct sbp2_pointer status_fifo;
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} request;
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__be32 response[4];
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dma_addr_t response_bus;
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struct completion done;
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struct sbp2_status status;
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};
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struct sbp2_login_response {
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__be32 misc;
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struct sbp2_pointer command_block_agent;
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__be32 reconnect_hold;
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};
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#define COMMAND_ORB_DATA_SIZE(v) ((v))
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#define COMMAND_ORB_PAGE_SIZE(v) ((v) << 16)
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#define COMMAND_ORB_PAGE_TABLE_PRESENT ((1) << 19)
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#define COMMAND_ORB_MAX_PAYLOAD(v) ((v) << 20)
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#define COMMAND_ORB_SPEED(v) ((v) << 24)
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#define COMMAND_ORB_DIRECTION ((1) << 27)
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#define COMMAND_ORB_REQUEST_FORMAT(v) ((v) << 29)
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#define COMMAND_ORB_NOTIFY ((1) << 31)
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struct sbp2_command_orb {
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struct sbp2_orb base;
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struct {
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struct sbp2_pointer next;
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struct sbp2_pointer data_descriptor;
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__be32 misc;
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u8 command_block[12];
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} request;
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struct scsi_cmnd *cmd;
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scsi_done_fn_t done;
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struct sbp2_logical_unit *lu;
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struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8)));
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dma_addr_t page_table_bus;
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};
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#define SBP2_ROM_VALUE_WILDCARD ~0 /* match all */
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#define SBP2_ROM_VALUE_MISSING 0xff000000 /* not present in the unit dir. */
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/*
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* List of devices with known bugs.
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*
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* The firmware_revision field, masked with 0xffff00, is the best
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* indicator for the type of bridge chip of a device. It yields a few
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* false positives but this did not break correctly behaving devices
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* so far.
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*/
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static const struct {
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u32 firmware_revision;
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u32 model;
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unsigned int workarounds;
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} sbp2_workarounds_table[] = {
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/* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
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.firmware_revision = 0x002800,
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.model = 0x001010,
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.workarounds = SBP2_WORKAROUND_INQUIRY_36 |
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SBP2_WORKAROUND_MODE_SENSE_8 |
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SBP2_WORKAROUND_POWER_CONDITION,
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},
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/* DViCO Momobay FX-3A with TSB42AA9A bridge */ {
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.firmware_revision = 0x002800,
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.model = 0x000000,
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.workarounds = SBP2_WORKAROUND_DELAY_INQUIRY |
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SBP2_WORKAROUND_POWER_CONDITION,
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},
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/* Initio bridges, actually only needed for some older ones */ {
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.firmware_revision = 0x000200,
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.model = SBP2_ROM_VALUE_WILDCARD,
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.workarounds = SBP2_WORKAROUND_INQUIRY_36,
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},
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/* PL-3507 bridge with Prolific firmware */ {
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.firmware_revision = 0x012800,
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.model = SBP2_ROM_VALUE_WILDCARD,
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.workarounds = SBP2_WORKAROUND_POWER_CONDITION,
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},
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/* Symbios bridge */ {
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.firmware_revision = 0xa0b800,
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.model = SBP2_ROM_VALUE_WILDCARD,
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.workarounds = SBP2_WORKAROUND_128K_MAX_TRANS,
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},
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/* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ {
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.firmware_revision = 0x002600,
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.model = SBP2_ROM_VALUE_WILDCARD,
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.workarounds = SBP2_WORKAROUND_128K_MAX_TRANS,
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},
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/*
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* There are iPods (2nd gen, 3rd gen) with model_id == 0, but
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* these iPods do not feature the read_capacity bug according
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* to one report. Read_capacity behaviour as well as model_id
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* could change due to Apple-supplied firmware updates though.
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*/
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/* iPod 4th generation. */ {
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.firmware_revision = 0x0a2700,
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.model = 0x000021,
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.workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
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},
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/* iPod mini */ {
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.firmware_revision = 0x0a2700,
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.model = 0x000022,
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.workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
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},
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/* iPod mini */ {
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.firmware_revision = 0x0a2700,
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.model = 0x000023,
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.workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
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},
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/* iPod Photo */ {
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.firmware_revision = 0x0a2700,
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.model = 0x00007e,
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.workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
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}
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};
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static void
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free_orb(struct kref *kref)
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{
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struct sbp2_orb *orb = container_of(kref, struct sbp2_orb, kref);
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kfree(orb);
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}
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static void
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sbp2_status_write(struct fw_card *card, struct fw_request *request,
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int tcode, int destination, int source,
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int generation, int speed,
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unsigned long long offset,
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void *payload, size_t length, void *callback_data)
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{
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struct sbp2_logical_unit *lu = callback_data;
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struct sbp2_orb *orb;
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struct sbp2_status status;
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size_t header_size;
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unsigned long flags;
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if (tcode != TCODE_WRITE_BLOCK_REQUEST ||
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length == 0 || length > sizeof(status)) {
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fw_send_response(card, request, RCODE_TYPE_ERROR);
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return;
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}
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header_size = min(length, 2 * sizeof(u32));
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fw_memcpy_from_be32(&status, payload, header_size);
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if (length > header_size)
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memcpy(status.data, payload + 8, length - header_size);
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if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) {
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fw_notify("non-orb related status write, not handled\n");
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fw_send_response(card, request, RCODE_COMPLETE);
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return;
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}
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/* Lookup the orb corresponding to this status write. */
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spin_lock_irqsave(&card->lock, flags);
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list_for_each_entry(orb, &lu->orb_list, link) {
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if (STATUS_GET_ORB_HIGH(status) == 0 &&
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STATUS_GET_ORB_LOW(status) == orb->request_bus) {
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orb->rcode = RCODE_COMPLETE;
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list_del(&orb->link);
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break;
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}
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}
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spin_unlock_irqrestore(&card->lock, flags);
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if (&orb->link != &lu->orb_list)
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orb->callback(orb, &status);
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else
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fw_error("status write for unknown orb\n");
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kref_put(&orb->kref, free_orb);
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fw_send_response(card, request, RCODE_COMPLETE);
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}
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static void
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complete_transaction(struct fw_card *card, int rcode,
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void *payload, size_t length, void *data)
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{
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struct sbp2_orb *orb = data;
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unsigned long flags;
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/*
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* This is a little tricky. We can get the status write for
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* the orb before we get this callback. The status write
|
|
* handler above will assume the orb pointer transaction was
|
|
* successful and set the rcode to RCODE_COMPLETE for the orb.
|
|
* So this callback only sets the rcode if it hasn't already
|
|
* been set and only does the cleanup if the transaction
|
|
* failed and we didn't already get a status write.
|
|
*/
|
|
spin_lock_irqsave(&card->lock, flags);
|
|
|
|
if (orb->rcode == -1)
|
|
orb->rcode = rcode;
|
|
if (orb->rcode != RCODE_COMPLETE) {
|
|
list_del(&orb->link);
|
|
spin_unlock_irqrestore(&card->lock, flags);
|
|
orb->callback(orb, NULL);
|
|
} else {
|
|
spin_unlock_irqrestore(&card->lock, flags);
|
|
}
|
|
|
|
kref_put(&orb->kref, free_orb);
|
|
}
|
|
|
|
static void
|
|
sbp2_send_orb(struct sbp2_orb *orb, struct sbp2_logical_unit *lu,
|
|
int node_id, int generation, u64 offset)
|
|
{
|
|
struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
|
|
unsigned long flags;
|
|
|
|
orb->pointer.high = 0;
|
|
orb->pointer.low = cpu_to_be32(orb->request_bus);
|
|
|
|
spin_lock_irqsave(&device->card->lock, flags);
|
|
list_add_tail(&orb->link, &lu->orb_list);
|
|
spin_unlock_irqrestore(&device->card->lock, flags);
|
|
|
|
/* Take a ref for the orb list and for the transaction callback. */
|
|
kref_get(&orb->kref);
|
|
kref_get(&orb->kref);
|
|
|
|
fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST,
|
|
node_id, generation, device->max_speed, offset,
|
|
&orb->pointer, sizeof(orb->pointer),
|
|
complete_transaction, orb);
|
|
}
|
|
|
|
static int sbp2_cancel_orbs(struct sbp2_logical_unit *lu)
|
|
{
|
|
struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
|
|
struct sbp2_orb *orb, *next;
|
|
struct list_head list;
|
|
unsigned long flags;
|
|
int retval = -ENOENT;
|
|
|
|
INIT_LIST_HEAD(&list);
|
|
spin_lock_irqsave(&device->card->lock, flags);
|
|
list_splice_init(&lu->orb_list, &list);
|
|
spin_unlock_irqrestore(&device->card->lock, flags);
|
|
|
|
list_for_each_entry_safe(orb, next, &list, link) {
|
|
retval = 0;
|
|
if (fw_cancel_transaction(device->card, &orb->t) == 0)
|
|
continue;
|
|
|
|
orb->rcode = RCODE_CANCELLED;
|
|
orb->callback(orb, NULL);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void
|
|
complete_management_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
|
|
{
|
|
struct sbp2_management_orb *orb =
|
|
container_of(base_orb, struct sbp2_management_orb, base);
|
|
|
|
if (status)
|
|
memcpy(&orb->status, status, sizeof(*status));
|
|
complete(&orb->done);
|
|
}
|
|
|
|
static int
|
|
sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id,
|
|
int generation, int function, int lun_or_login_id,
|
|
void *response)
|
|
{
|
|
struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
|
|
struct sbp2_management_orb *orb;
|
|
unsigned int timeout;
|
|
int retval = -ENOMEM;
|
|
|
|
if (function == SBP2_LOGOUT_REQUEST && fw_device_is_shutdown(device))
|
|
return 0;
|
|
|
|
orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
|
|
if (orb == NULL)
|
|
return -ENOMEM;
|
|
|
|
kref_init(&orb->base.kref);
|
|
orb->response_bus =
|
|
dma_map_single(device->card->device, &orb->response,
|
|
sizeof(orb->response), DMA_FROM_DEVICE);
|
|
if (dma_mapping_error(device->card->device, orb->response_bus))
|
|
goto fail_mapping_response;
|
|
|
|
orb->request.response.high = 0;
|
|
orb->request.response.low = cpu_to_be32(orb->response_bus);
|
|
|
|
orb->request.misc = cpu_to_be32(
|
|
MANAGEMENT_ORB_NOTIFY |
|
|
MANAGEMENT_ORB_FUNCTION(function) |
|
|
MANAGEMENT_ORB_LUN(lun_or_login_id));
|
|
orb->request.length = cpu_to_be32(
|
|
MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response)));
|
|
|
|
orb->request.status_fifo.high =
|
|
cpu_to_be32(lu->address_handler.offset >> 32);
|
|
orb->request.status_fifo.low =
|
|
cpu_to_be32(lu->address_handler.offset);
|
|
|
|
if (function == SBP2_LOGIN_REQUEST) {
|
|
/* Ask for 2^2 == 4 seconds reconnect grace period */
|
|
orb->request.misc |= cpu_to_be32(
|
|
MANAGEMENT_ORB_RECONNECT(2) |
|
|
MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login));
|
|
timeout = lu->tgt->mgt_orb_timeout;
|
|
} else {
|
|
timeout = SBP2_ORB_TIMEOUT;
|
|
}
|
|
|
|
init_completion(&orb->done);
|
|
orb->base.callback = complete_management_orb;
|
|
|
|
orb->base.request_bus =
|
|
dma_map_single(device->card->device, &orb->request,
|
|
sizeof(orb->request), DMA_TO_DEVICE);
|
|
if (dma_mapping_error(device->card->device, orb->base.request_bus))
|
|
goto fail_mapping_request;
|
|
|
|
sbp2_send_orb(&orb->base, lu, node_id, generation,
|
|
lu->tgt->management_agent_address);
|
|
|
|
wait_for_completion_timeout(&orb->done, msecs_to_jiffies(timeout));
|
|
|
|
retval = -EIO;
|
|
if (sbp2_cancel_orbs(lu) == 0) {
|
|
fw_error("%s: orb reply timed out, rcode=0x%02x\n",
|
|
lu->tgt->bus_id, orb->base.rcode);
|
|
goto out;
|
|
}
|
|
|
|
if (orb->base.rcode != RCODE_COMPLETE) {
|
|
fw_error("%s: management write failed, rcode 0x%02x\n",
|
|
lu->tgt->bus_id, orb->base.rcode);
|
|
goto out;
|
|
}
|
|
|
|
if (STATUS_GET_RESPONSE(orb->status) != 0 ||
|
|
STATUS_GET_SBP_STATUS(orb->status) != 0) {
|
|
fw_error("%s: error status: %d:%d\n", lu->tgt->bus_id,
|
|
STATUS_GET_RESPONSE(orb->status),
|
|
STATUS_GET_SBP_STATUS(orb->status));
|
|
goto out;
|
|
}
|
|
|
|
retval = 0;
|
|
out:
|
|
dma_unmap_single(device->card->device, orb->base.request_bus,
|
|
sizeof(orb->request), DMA_TO_DEVICE);
|
|
fail_mapping_request:
|
|
dma_unmap_single(device->card->device, orb->response_bus,
|
|
sizeof(orb->response), DMA_FROM_DEVICE);
|
|
fail_mapping_response:
|
|
if (response)
|
|
memcpy(response, orb->response, sizeof(orb->response));
|
|
kref_put(&orb->base.kref, free_orb);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void sbp2_agent_reset(struct sbp2_logical_unit *lu)
|
|
{
|
|
struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
|
|
__be32 d = 0;
|
|
|
|
fw_run_transaction(device->card, TCODE_WRITE_QUADLET_REQUEST,
|
|
lu->tgt->node_id, lu->generation, device->max_speed,
|
|
lu->command_block_agent_address + SBP2_AGENT_RESET,
|
|
&d, sizeof(d));
|
|
}
|
|
|
|
static void
|
|
complete_agent_reset_write_no_wait(struct fw_card *card, int rcode,
|
|
void *payload, size_t length, void *data)
|
|
{
|
|
kfree(data);
|
|
}
|
|
|
|
static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu)
|
|
{
|
|
struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
|
|
struct fw_transaction *t;
|
|
static __be32 d;
|
|
|
|
t = kmalloc(sizeof(*t), GFP_ATOMIC);
|
|
if (t == NULL)
|
|
return;
|
|
|
|
fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
|
|
lu->tgt->node_id, lu->generation, device->max_speed,
|
|
lu->command_block_agent_address + SBP2_AGENT_RESET,
|
|
&d, sizeof(d), complete_agent_reset_write_no_wait, t);
|
|
}
|
|
|
|
static inline void sbp2_allow_block(struct sbp2_logical_unit *lu)
|
|
{
|
|
/*
|
|
* We may access dont_block without taking card->lock here:
|
|
* All callers of sbp2_allow_block() and all callers of sbp2_unblock()
|
|
* are currently serialized against each other.
|
|
* And a wrong result in sbp2_conditionally_block()'s access of
|
|
* dont_block is rather harmless, it simply misses its first chance.
|
|
*/
|
|
--lu->tgt->dont_block;
|
|
}
|
|
|
|
/*
|
|
* Blocks lu->tgt if all of the following conditions are met:
|
|
* - Login, INQUIRY, and high-level SCSI setup of all of the target's
|
|
* logical units have been finished (indicated by dont_block == 0).
|
|
* - lu->generation is stale.
|
|
*
|
|
* Note, scsi_block_requests() must be called while holding card->lock,
|
|
* otherwise it might foil sbp2_[conditionally_]unblock()'s attempt to
|
|
* unblock the target.
|
|
*/
|
|
static void sbp2_conditionally_block(struct sbp2_logical_unit *lu)
|
|
{
|
|
struct sbp2_target *tgt = lu->tgt;
|
|
struct fw_card *card = fw_device(tgt->unit->device.parent)->card;
|
|
struct Scsi_Host *shost =
|
|
container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&card->lock, flags);
|
|
if (!tgt->dont_block && !lu->blocked &&
|
|
lu->generation != card->generation) {
|
|
lu->blocked = true;
|
|
if (++tgt->blocked == 1)
|
|
scsi_block_requests(shost);
|
|
}
|
|
spin_unlock_irqrestore(&card->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Unblocks lu->tgt as soon as all its logical units can be unblocked.
|
|
* Note, it is harmless to run scsi_unblock_requests() outside the
|
|
* card->lock protected section. On the other hand, running it inside
|
|
* the section might clash with shost->host_lock.
|
|
*/
|
|
static void sbp2_conditionally_unblock(struct sbp2_logical_unit *lu)
|
|
{
|
|
struct sbp2_target *tgt = lu->tgt;
|
|
struct fw_card *card = fw_device(tgt->unit->device.parent)->card;
|
|
struct Scsi_Host *shost =
|
|
container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
|
|
unsigned long flags;
|
|
bool unblock = false;
|
|
|
|
spin_lock_irqsave(&card->lock, flags);
|
|
if (lu->blocked && lu->generation == card->generation) {
|
|
lu->blocked = false;
|
|
unblock = --tgt->blocked == 0;
|
|
}
|
|
spin_unlock_irqrestore(&card->lock, flags);
|
|
|
|
if (unblock)
|
|
scsi_unblock_requests(shost);
|
|
}
|
|
|
|
/*
|
|
* Prevents future blocking of tgt and unblocks it.
|
|
* Note, it is harmless to run scsi_unblock_requests() outside the
|
|
* card->lock protected section. On the other hand, running it inside
|
|
* the section might clash with shost->host_lock.
|
|
*/
|
|
static void sbp2_unblock(struct sbp2_target *tgt)
|
|
{
|
|
struct fw_card *card = fw_device(tgt->unit->device.parent)->card;
|
|
struct Scsi_Host *shost =
|
|
container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&card->lock, flags);
|
|
++tgt->dont_block;
|
|
spin_unlock_irqrestore(&card->lock, flags);
|
|
|
|
scsi_unblock_requests(shost);
|
|
}
|
|
|
|
static int sbp2_lun2int(u16 lun)
|
|
{
|
|
struct scsi_lun eight_bytes_lun;
|
|
|
|
memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun));
|
|
eight_bytes_lun.scsi_lun[0] = (lun >> 8) & 0xff;
|
|
eight_bytes_lun.scsi_lun[1] = lun & 0xff;
|
|
|
|
return scsilun_to_int(&eight_bytes_lun);
|
|
}
|
|
|
|
static void sbp2_release_target(struct kref *kref)
|
|
{
|
|
struct sbp2_target *tgt = container_of(kref, struct sbp2_target, kref);
|
|
struct sbp2_logical_unit *lu, *next;
|
|
struct Scsi_Host *shost =
|
|
container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
|
|
struct scsi_device *sdev;
|
|
struct fw_device *device = fw_device(tgt->unit->device.parent);
|
|
|
|
/* prevent deadlocks */
|
|
sbp2_unblock(tgt);
|
|
|
|
list_for_each_entry_safe(lu, next, &tgt->lu_list, link) {
|
|
sdev = scsi_device_lookup(shost, 0, 0, sbp2_lun2int(lu->lun));
|
|
if (sdev) {
|
|
scsi_remove_device(sdev);
|
|
scsi_device_put(sdev);
|
|
}
|
|
if (lu->login_id != INVALID_LOGIN_ID) {
|
|
int generation, node_id;
|
|
/*
|
|
* tgt->node_id may be obsolete here if we failed
|
|
* during initial login or after a bus reset where
|
|
* the topology changed.
|
|
*/
|
|
generation = device->generation;
|
|
smp_rmb(); /* node_id vs. generation */
|
|
node_id = device->node_id;
|
|
sbp2_send_management_orb(lu, node_id, generation,
|
|
SBP2_LOGOUT_REQUEST,
|
|
lu->login_id, NULL);
|
|
}
|
|
fw_core_remove_address_handler(&lu->address_handler);
|
|
list_del(&lu->link);
|
|
kfree(lu);
|
|
}
|
|
scsi_remove_host(shost);
|
|
fw_notify("released %s, target %d:0:0\n", tgt->bus_id, shost->host_no);
|
|
|
|
fw_unit_put(tgt->unit);
|
|
scsi_host_put(shost);
|
|
fw_device_put(device);
|
|
}
|
|
|
|
static struct workqueue_struct *sbp2_wq;
|
|
|
|
static void sbp2_target_put(struct sbp2_target *tgt)
|
|
{
|
|
kref_put(&tgt->kref, sbp2_release_target);
|
|
}
|
|
|
|
/*
|
|
* Always get the target's kref when scheduling work on one its units.
|
|
* Each workqueue job is responsible to call sbp2_target_put() upon return.
|
|
*/
|
|
static void sbp2_queue_work(struct sbp2_logical_unit *lu, unsigned long delay)
|
|
{
|
|
kref_get(&lu->tgt->kref);
|
|
if (!queue_delayed_work(sbp2_wq, &lu->work, delay))
|
|
sbp2_target_put(lu->tgt);
|
|
}
|
|
|
|
/*
|
|
* Write retransmit retry values into the BUSY_TIMEOUT register.
|
|
* - The single-phase retry protocol is supported by all SBP-2 devices, but the
|
|
* default retry_limit value is 0 (i.e. never retry transmission). We write a
|
|
* saner value after logging into the device.
|
|
* - The dual-phase retry protocol is optional to implement, and if not
|
|
* supported, writes to the dual-phase portion of the register will be
|
|
* ignored. We try to write the original 1394-1995 default here.
|
|
* - In the case of devices that are also SBP-3-compliant, all writes are
|
|
* ignored, as the register is read-only, but contains single-phase retry of
|
|
* 15, which is what we're trying to set for all SBP-2 device anyway, so this
|
|
* write attempt is safe and yields more consistent behavior for all devices.
|
|
*
|
|
* See section 8.3.2.3.5 of the 1394-1995 spec, section 6.2 of the SBP-2 spec,
|
|
* and section 6.4 of the SBP-3 spec for further details.
|
|
*/
|
|
static void sbp2_set_busy_timeout(struct sbp2_logical_unit *lu)
|
|
{
|
|
struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
|
|
__be32 d = cpu_to_be32(SBP2_CYCLE_LIMIT | SBP2_RETRY_LIMIT);
|
|
|
|
fw_run_transaction(device->card, TCODE_WRITE_QUADLET_REQUEST,
|
|
lu->tgt->node_id, lu->generation, device->max_speed,
|
|
CSR_REGISTER_BASE + CSR_BUSY_TIMEOUT,
|
|
&d, sizeof(d));
|
|
}
|
|
|
|
static void sbp2_reconnect(struct work_struct *work);
|
|
|
|
static void sbp2_login(struct work_struct *work)
|
|
{
|
|
struct sbp2_logical_unit *lu =
|
|
container_of(work, struct sbp2_logical_unit, work.work);
|
|
struct sbp2_target *tgt = lu->tgt;
|
|
struct fw_device *device = fw_device(tgt->unit->device.parent);
|
|
struct Scsi_Host *shost;
|
|
struct scsi_device *sdev;
|
|
struct sbp2_login_response response;
|
|
int generation, node_id, local_node_id;
|
|
|
|
if (fw_device_is_shutdown(device))
|
|
goto out;
|
|
|
|
generation = device->generation;
|
|
smp_rmb(); /* node IDs must not be older than generation */
|
|
node_id = device->node_id;
|
|
local_node_id = device->card->node_id;
|
|
|
|
/* If this is a re-login attempt, log out, or we might be rejected. */
|
|
if (lu->has_sdev)
|
|
sbp2_send_management_orb(lu, device->node_id, generation,
|
|
SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
|
|
|
|
if (sbp2_send_management_orb(lu, node_id, generation,
|
|
SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) {
|
|
if (lu->retries++ < 5) {
|
|
sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
|
|
} else {
|
|
fw_error("%s: failed to login to LUN %04x\n",
|
|
tgt->bus_id, lu->lun);
|
|
/* Let any waiting I/O fail from now on. */
|
|
sbp2_unblock(lu->tgt);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
tgt->node_id = node_id;
|
|
tgt->address_high = local_node_id << 16;
|
|
smp_wmb(); /* node IDs must not be older than generation */
|
|
lu->generation = generation;
|
|
|
|
lu->command_block_agent_address =
|
|
((u64)(be32_to_cpu(response.command_block_agent.high) & 0xffff)
|
|
<< 32) | be32_to_cpu(response.command_block_agent.low);
|
|
lu->login_id = be32_to_cpu(response.misc) & 0xffff;
|
|
|
|
fw_notify("%s: logged in to LUN %04x (%d retries)\n",
|
|
tgt->bus_id, lu->lun, lu->retries);
|
|
|
|
/* set appropriate retry limit(s) in BUSY_TIMEOUT register */
|
|
sbp2_set_busy_timeout(lu);
|
|
|
|
PREPARE_DELAYED_WORK(&lu->work, sbp2_reconnect);
|
|
sbp2_agent_reset(lu);
|
|
|
|
/* This was a re-login. */
|
|
if (lu->has_sdev) {
|
|
sbp2_cancel_orbs(lu);
|
|
sbp2_conditionally_unblock(lu);
|
|
goto out;
|
|
}
|
|
|
|
if (lu->tgt->workarounds & SBP2_WORKAROUND_DELAY_INQUIRY)
|
|
ssleep(SBP2_INQUIRY_DELAY);
|
|
|
|
shost = container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
|
|
sdev = __scsi_add_device(shost, 0, 0, sbp2_lun2int(lu->lun), lu);
|
|
/*
|
|
* FIXME: We are unable to perform reconnects while in sbp2_login().
|
|
* Therefore __scsi_add_device() will get into trouble if a bus reset
|
|
* happens in parallel. It will either fail or leave us with an
|
|
* unusable sdev. As a workaround we check for this and retry the
|
|
* whole login and SCSI probing.
|
|
*/
|
|
|
|
/* Reported error during __scsi_add_device() */
|
|
if (IS_ERR(sdev))
|
|
goto out_logout_login;
|
|
|
|
/* Unreported error during __scsi_add_device() */
|
|
smp_rmb(); /* get current card generation */
|
|
if (generation != device->card->generation) {
|
|
scsi_remove_device(sdev);
|
|
scsi_device_put(sdev);
|
|
goto out_logout_login;
|
|
}
|
|
|
|
/* No error during __scsi_add_device() */
|
|
lu->has_sdev = true;
|
|
scsi_device_put(sdev);
|
|
sbp2_allow_block(lu);
|
|
goto out;
|
|
|
|
out_logout_login:
|
|
smp_rmb(); /* generation may have changed */
|
|
generation = device->generation;
|
|
smp_rmb(); /* node_id must not be older than generation */
|
|
|
|
sbp2_send_management_orb(lu, device->node_id, generation,
|
|
SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
|
|
/*
|
|
* If a bus reset happened, sbp2_update will have requeued
|
|
* lu->work already. Reset the work from reconnect to login.
|
|
*/
|
|
PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
|
|
out:
|
|
sbp2_target_put(tgt);
|
|
}
|
|
|
|
static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry)
|
|
{
|
|
struct sbp2_logical_unit *lu;
|
|
|
|
lu = kmalloc(sizeof(*lu), GFP_KERNEL);
|
|
if (!lu)
|
|
return -ENOMEM;
|
|
|
|
lu->address_handler.length = 0x100;
|
|
lu->address_handler.address_callback = sbp2_status_write;
|
|
lu->address_handler.callback_data = lu;
|
|
|
|
if (fw_core_add_address_handler(&lu->address_handler,
|
|
&fw_high_memory_region) < 0) {
|
|
kfree(lu);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
lu->tgt = tgt;
|
|
lu->lun = lun_entry & 0xffff;
|
|
lu->login_id = INVALID_LOGIN_ID;
|
|
lu->retries = 0;
|
|
lu->has_sdev = false;
|
|
lu->blocked = false;
|
|
++tgt->dont_block;
|
|
INIT_LIST_HEAD(&lu->orb_list);
|
|
INIT_DELAYED_WORK(&lu->work, sbp2_login);
|
|
|
|
list_add_tail(&lu->link, &tgt->lu_list);
|
|
return 0;
|
|
}
|
|
|
|
static int sbp2_scan_logical_unit_dir(struct sbp2_target *tgt, u32 *directory)
|
|
{
|
|
struct fw_csr_iterator ci;
|
|
int key, value;
|
|
|
|
fw_csr_iterator_init(&ci, directory);
|
|
while (fw_csr_iterator_next(&ci, &key, &value))
|
|
if (key == SBP2_CSR_LOGICAL_UNIT_NUMBER &&
|
|
sbp2_add_logical_unit(tgt, value) < 0)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static int sbp2_scan_unit_dir(struct sbp2_target *tgt, u32 *directory,
|
|
u32 *model, u32 *firmware_revision)
|
|
{
|
|
struct fw_csr_iterator ci;
|
|
int key, value;
|
|
unsigned int timeout;
|
|
|
|
fw_csr_iterator_init(&ci, directory);
|
|
while (fw_csr_iterator_next(&ci, &key, &value)) {
|
|
switch (key) {
|
|
|
|
case CSR_DEPENDENT_INFO | CSR_OFFSET:
|
|
tgt->management_agent_address =
|
|
CSR_REGISTER_BASE + 4 * value;
|
|
break;
|
|
|
|
case CSR_DIRECTORY_ID:
|
|
tgt->directory_id = value;
|
|
break;
|
|
|
|
case CSR_MODEL:
|
|
*model = value;
|
|
break;
|
|
|
|
case SBP2_CSR_FIRMWARE_REVISION:
|
|
*firmware_revision = value;
|
|
break;
|
|
|
|
case SBP2_CSR_UNIT_CHARACTERISTICS:
|
|
/* the timeout value is stored in 500ms units */
|
|
timeout = ((unsigned int) value >> 8 & 0xff) * 500;
|
|
timeout = max(timeout, SBP2_MIN_LOGIN_ORB_TIMEOUT);
|
|
tgt->mgt_orb_timeout =
|
|
min(timeout, SBP2_MAX_LOGIN_ORB_TIMEOUT);
|
|
|
|
if (timeout > tgt->mgt_orb_timeout)
|
|
fw_notify("%s: config rom contains %ds "
|
|
"management ORB timeout, limiting "
|
|
"to %ds\n", tgt->bus_id,
|
|
timeout / 1000,
|
|
tgt->mgt_orb_timeout / 1000);
|
|
break;
|
|
|
|
case SBP2_CSR_LOGICAL_UNIT_NUMBER:
|
|
if (sbp2_add_logical_unit(tgt, value) < 0)
|
|
return -ENOMEM;
|
|
break;
|
|
|
|
case SBP2_CSR_LOGICAL_UNIT_DIRECTORY:
|
|
/* Adjust for the increment in the iterator */
|
|
if (sbp2_scan_logical_unit_dir(tgt, ci.p - 1 + value) < 0)
|
|
return -ENOMEM;
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model,
|
|
u32 firmware_revision)
|
|
{
|
|
int i;
|
|
unsigned int w = sbp2_param_workarounds;
|
|
|
|
if (w)
|
|
fw_notify("Please notify linux1394-devel@lists.sourceforge.net "
|
|
"if you need the workarounds parameter for %s\n",
|
|
tgt->bus_id);
|
|
|
|
if (w & SBP2_WORKAROUND_OVERRIDE)
|
|
goto out;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
|
|
|
|
if (sbp2_workarounds_table[i].firmware_revision !=
|
|
(firmware_revision & 0xffffff00))
|
|
continue;
|
|
|
|
if (sbp2_workarounds_table[i].model != model &&
|
|
sbp2_workarounds_table[i].model != SBP2_ROM_VALUE_WILDCARD)
|
|
continue;
|
|
|
|
w |= sbp2_workarounds_table[i].workarounds;
|
|
break;
|
|
}
|
|
out:
|
|
if (w)
|
|
fw_notify("Workarounds for %s: 0x%x "
|
|
"(firmware_revision 0x%06x, model_id 0x%06x)\n",
|
|
tgt->bus_id, w, firmware_revision, model);
|
|
tgt->workarounds = w;
|
|
}
|
|
|
|
static struct scsi_host_template scsi_driver_template;
|
|
|
|
static int sbp2_probe(struct device *dev)
|
|
{
|
|
struct fw_unit *unit = fw_unit(dev);
|
|
struct fw_device *device = fw_device(unit->device.parent);
|
|
struct sbp2_target *tgt;
|
|
struct sbp2_logical_unit *lu;
|
|
struct Scsi_Host *shost;
|
|
u32 model, firmware_revision;
|
|
|
|
if (dma_get_max_seg_size(device->card->device) > SBP2_MAX_SEG_SIZE)
|
|
BUG_ON(dma_set_max_seg_size(device->card->device,
|
|
SBP2_MAX_SEG_SIZE));
|
|
|
|
shost = scsi_host_alloc(&scsi_driver_template, sizeof(*tgt));
|
|
if (shost == NULL)
|
|
return -ENOMEM;
|
|
|
|
tgt = (struct sbp2_target *)shost->hostdata;
|
|
unit->device.driver_data = tgt;
|
|
tgt->unit = unit;
|
|
kref_init(&tgt->kref);
|
|
INIT_LIST_HEAD(&tgt->lu_list);
|
|
tgt->bus_id = dev_name(&unit->device);
|
|
tgt->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
|
|
|
|
if (fw_device_enable_phys_dma(device) < 0)
|
|
goto fail_shost_put;
|
|
|
|
if (scsi_add_host(shost, &unit->device) < 0)
|
|
goto fail_shost_put;
|
|
|
|
fw_device_get(device);
|
|
fw_unit_get(unit);
|
|
|
|
/* implicit directory ID */
|
|
tgt->directory_id = ((unit->directory - device->config_rom) * 4
|
|
+ CSR_CONFIG_ROM) & 0xffffff;
|
|
|
|
firmware_revision = SBP2_ROM_VALUE_MISSING;
|
|
model = SBP2_ROM_VALUE_MISSING;
|
|
|
|
if (sbp2_scan_unit_dir(tgt, unit->directory, &model,
|
|
&firmware_revision) < 0)
|
|
goto fail_tgt_put;
|
|
|
|
sbp2_init_workarounds(tgt, model, firmware_revision);
|
|
|
|
/*
|
|
* At S100 we can do 512 bytes per packet, at S200 1024 bytes,
|
|
* and so on up to 4096 bytes. The SBP-2 max_payload field
|
|
* specifies the max payload size as 2 ^ (max_payload + 2), so
|
|
* if we set this to max_speed + 7, we get the right value.
|
|
*/
|
|
tgt->max_payload = min(device->max_speed + 7, 10U);
|
|
tgt->max_payload = min(tgt->max_payload, device->card->max_receive - 1);
|
|
|
|
/* Do the login in a workqueue so we can easily reschedule retries. */
|
|
list_for_each_entry(lu, &tgt->lu_list, link)
|
|
sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
|
|
return 0;
|
|
|
|
fail_tgt_put:
|
|
sbp2_target_put(tgt);
|
|
return -ENOMEM;
|
|
|
|
fail_shost_put:
|
|
scsi_host_put(shost);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int sbp2_remove(struct device *dev)
|
|
{
|
|
struct fw_unit *unit = fw_unit(dev);
|
|
struct sbp2_target *tgt = unit->device.driver_data;
|
|
|
|
sbp2_target_put(tgt);
|
|
return 0;
|
|
}
|
|
|
|
static void sbp2_reconnect(struct work_struct *work)
|
|
{
|
|
struct sbp2_logical_unit *lu =
|
|
container_of(work, struct sbp2_logical_unit, work.work);
|
|
struct sbp2_target *tgt = lu->tgt;
|
|
struct fw_device *device = fw_device(tgt->unit->device.parent);
|
|
int generation, node_id, local_node_id;
|
|
|
|
if (fw_device_is_shutdown(device))
|
|
goto out;
|
|
|
|
generation = device->generation;
|
|
smp_rmb(); /* node IDs must not be older than generation */
|
|
node_id = device->node_id;
|
|
local_node_id = device->card->node_id;
|
|
|
|
if (sbp2_send_management_orb(lu, node_id, generation,
|
|
SBP2_RECONNECT_REQUEST,
|
|
lu->login_id, NULL) < 0) {
|
|
/*
|
|
* If reconnect was impossible even though we are in the
|
|
* current generation, fall back and try to log in again.
|
|
*
|
|
* We could check for "Function rejected" status, but
|
|
* looking at the bus generation as simpler and more general.
|
|
*/
|
|
smp_rmb(); /* get current card generation */
|
|
if (generation == device->card->generation ||
|
|
lu->retries++ >= 5) {
|
|
fw_error("%s: failed to reconnect\n", tgt->bus_id);
|
|
lu->retries = 0;
|
|
PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
|
|
}
|
|
sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
|
|
goto out;
|
|
}
|
|
|
|
tgt->node_id = node_id;
|
|
tgt->address_high = local_node_id << 16;
|
|
smp_wmb(); /* node IDs must not be older than generation */
|
|
lu->generation = generation;
|
|
|
|
fw_notify("%s: reconnected to LUN %04x (%d retries)\n",
|
|
tgt->bus_id, lu->lun, lu->retries);
|
|
|
|
sbp2_agent_reset(lu);
|
|
sbp2_cancel_orbs(lu);
|
|
sbp2_conditionally_unblock(lu);
|
|
out:
|
|
sbp2_target_put(tgt);
|
|
}
|
|
|
|
static void sbp2_update(struct fw_unit *unit)
|
|
{
|
|
struct sbp2_target *tgt = unit->device.driver_data;
|
|
struct sbp2_logical_unit *lu;
|
|
|
|
fw_device_enable_phys_dma(fw_device(unit->device.parent));
|
|
|
|
/*
|
|
* Fw-core serializes sbp2_update() against sbp2_remove().
|
|
* Iteration over tgt->lu_list is therefore safe here.
|
|
*/
|
|
list_for_each_entry(lu, &tgt->lu_list, link) {
|
|
sbp2_conditionally_block(lu);
|
|
lu->retries = 0;
|
|
sbp2_queue_work(lu, 0);
|
|
}
|
|
}
|
|
|
|
#define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
|
|
#define SBP2_SW_VERSION_ENTRY 0x00010483
|
|
|
|
static const struct fw_device_id sbp2_id_table[] = {
|
|
{
|
|
.match_flags = FW_MATCH_SPECIFIER_ID | FW_MATCH_VERSION,
|
|
.specifier_id = SBP2_UNIT_SPEC_ID_ENTRY,
|
|
.version = SBP2_SW_VERSION_ENTRY,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct fw_driver sbp2_driver = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = sbp2_driver_name,
|
|
.bus = &fw_bus_type,
|
|
.probe = sbp2_probe,
|
|
.remove = sbp2_remove,
|
|
},
|
|
.update = sbp2_update,
|
|
.id_table = sbp2_id_table,
|
|
};
|
|
|
|
static unsigned int
|
|
sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data)
|
|
{
|
|
int sam_status;
|
|
|
|
sense_data[0] = 0x70;
|
|
sense_data[1] = 0x0;
|
|
sense_data[2] = sbp2_status[1];
|
|
sense_data[3] = sbp2_status[4];
|
|
sense_data[4] = sbp2_status[5];
|
|
sense_data[5] = sbp2_status[6];
|
|
sense_data[6] = sbp2_status[7];
|
|
sense_data[7] = 10;
|
|
sense_data[8] = sbp2_status[8];
|
|
sense_data[9] = sbp2_status[9];
|
|
sense_data[10] = sbp2_status[10];
|
|
sense_data[11] = sbp2_status[11];
|
|
sense_data[12] = sbp2_status[2];
|
|
sense_data[13] = sbp2_status[3];
|
|
sense_data[14] = sbp2_status[12];
|
|
sense_data[15] = sbp2_status[13];
|
|
|
|
sam_status = sbp2_status[0] & 0x3f;
|
|
|
|
switch (sam_status) {
|
|
case SAM_STAT_GOOD:
|
|
case SAM_STAT_CHECK_CONDITION:
|
|
case SAM_STAT_CONDITION_MET:
|
|
case SAM_STAT_BUSY:
|
|
case SAM_STAT_RESERVATION_CONFLICT:
|
|
case SAM_STAT_COMMAND_TERMINATED:
|
|
return DID_OK << 16 | sam_status;
|
|
|
|
default:
|
|
return DID_ERROR << 16;
|
|
}
|
|
}
|
|
|
|
static void
|
|
complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
|
|
{
|
|
struct sbp2_command_orb *orb =
|
|
container_of(base_orb, struct sbp2_command_orb, base);
|
|
struct fw_device *device = fw_device(orb->lu->tgt->unit->device.parent);
|
|
int result;
|
|
|
|
if (status != NULL) {
|
|
if (STATUS_GET_DEAD(*status))
|
|
sbp2_agent_reset_no_wait(orb->lu);
|
|
|
|
switch (STATUS_GET_RESPONSE(*status)) {
|
|
case SBP2_STATUS_REQUEST_COMPLETE:
|
|
result = DID_OK << 16;
|
|
break;
|
|
case SBP2_STATUS_TRANSPORT_FAILURE:
|
|
result = DID_BUS_BUSY << 16;
|
|
break;
|
|
case SBP2_STATUS_ILLEGAL_REQUEST:
|
|
case SBP2_STATUS_VENDOR_DEPENDENT:
|
|
default:
|
|
result = DID_ERROR << 16;
|
|
break;
|
|
}
|
|
|
|
if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1)
|
|
result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status),
|
|
orb->cmd->sense_buffer);
|
|
} else {
|
|
/*
|
|
* If the orb completes with status == NULL, something
|
|
* went wrong, typically a bus reset happened mid-orb
|
|
* or when sending the write (less likely).
|
|
*/
|
|
result = DID_BUS_BUSY << 16;
|
|
sbp2_conditionally_block(orb->lu);
|
|
}
|
|
|
|
dma_unmap_single(device->card->device, orb->base.request_bus,
|
|
sizeof(orb->request), DMA_TO_DEVICE);
|
|
|
|
if (scsi_sg_count(orb->cmd) > 0)
|
|
dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd),
|
|
scsi_sg_count(orb->cmd),
|
|
orb->cmd->sc_data_direction);
|
|
|
|
if (orb->page_table_bus != 0)
|
|
dma_unmap_single(device->card->device, orb->page_table_bus,
|
|
sizeof(orb->page_table), DMA_TO_DEVICE);
|
|
|
|
orb->cmd->result = result;
|
|
orb->done(orb->cmd);
|
|
}
|
|
|
|
static int
|
|
sbp2_map_scatterlist(struct sbp2_command_orb *orb, struct fw_device *device,
|
|
struct sbp2_logical_unit *lu)
|
|
{
|
|
struct scatterlist *sg = scsi_sglist(orb->cmd);
|
|
int i, n;
|
|
|
|
n = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
|
|
orb->cmd->sc_data_direction);
|
|
if (n == 0)
|
|
goto fail;
|
|
|
|
/*
|
|
* Handle the special case where there is only one element in
|
|
* the scatter list by converting it to an immediate block
|
|
* request. This is also a workaround for broken devices such
|
|
* as the second generation iPod which doesn't support page
|
|
* tables.
|
|
*/
|
|
if (n == 1) {
|
|
orb->request.data_descriptor.high =
|
|
cpu_to_be32(lu->tgt->address_high);
|
|
orb->request.data_descriptor.low =
|
|
cpu_to_be32(sg_dma_address(sg));
|
|
orb->request.misc |=
|
|
cpu_to_be32(COMMAND_ORB_DATA_SIZE(sg_dma_len(sg)));
|
|
return 0;
|
|
}
|
|
|
|
for_each_sg(sg, sg, n, i) {
|
|
orb->page_table[i].high = cpu_to_be32(sg_dma_len(sg) << 16);
|
|
orb->page_table[i].low = cpu_to_be32(sg_dma_address(sg));
|
|
}
|
|
|
|
orb->page_table_bus =
|
|
dma_map_single(device->card->device, orb->page_table,
|
|
sizeof(orb->page_table), DMA_TO_DEVICE);
|
|
if (dma_mapping_error(device->card->device, orb->page_table_bus))
|
|
goto fail_page_table;
|
|
|
|
/*
|
|
* The data_descriptor pointer is the one case where we need
|
|
* to fill in the node ID part of the address. All other
|
|
* pointers assume that the data referenced reside on the
|
|
* initiator (i.e. us), but data_descriptor can refer to data
|
|
* on other nodes so we need to put our ID in descriptor.high.
|
|
*/
|
|
orb->request.data_descriptor.high = cpu_to_be32(lu->tgt->address_high);
|
|
orb->request.data_descriptor.low = cpu_to_be32(orb->page_table_bus);
|
|
orb->request.misc |= cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT |
|
|
COMMAND_ORB_DATA_SIZE(n));
|
|
|
|
return 0;
|
|
|
|
fail_page_table:
|
|
dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd),
|
|
scsi_sg_count(orb->cmd), orb->cmd->sc_data_direction);
|
|
fail:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* SCSI stack integration */
|
|
|
|
static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
|
|
{
|
|
struct sbp2_logical_unit *lu = cmd->device->hostdata;
|
|
struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
|
|
struct sbp2_command_orb *orb;
|
|
int generation, retval = SCSI_MLQUEUE_HOST_BUSY;
|
|
|
|
/*
|
|
* Bidirectional commands are not yet implemented, and unknown
|
|
* transfer direction not handled.
|
|
*/
|
|
if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) {
|
|
fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n");
|
|
cmd->result = DID_ERROR << 16;
|
|
done(cmd);
|
|
return 0;
|
|
}
|
|
|
|
orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
|
|
if (orb == NULL) {
|
|
fw_notify("failed to alloc orb\n");
|
|
return SCSI_MLQUEUE_HOST_BUSY;
|
|
}
|
|
|
|
/* Initialize rcode to something not RCODE_COMPLETE. */
|
|
orb->base.rcode = -1;
|
|
kref_init(&orb->base.kref);
|
|
|
|
orb->lu = lu;
|
|
orb->done = done;
|
|
orb->cmd = cmd;
|
|
|
|
orb->request.next.high = cpu_to_be32(SBP2_ORB_NULL);
|
|
orb->request.misc = cpu_to_be32(
|
|
COMMAND_ORB_MAX_PAYLOAD(lu->tgt->max_payload) |
|
|
COMMAND_ORB_SPEED(device->max_speed) |
|
|
COMMAND_ORB_NOTIFY);
|
|
|
|
if (cmd->sc_data_direction == DMA_FROM_DEVICE)
|
|
orb->request.misc |= cpu_to_be32(COMMAND_ORB_DIRECTION);
|
|
|
|
generation = device->generation;
|
|
smp_rmb(); /* sbp2_map_scatterlist looks at tgt->address_high */
|
|
|
|
if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0)
|
|
goto out;
|
|
|
|
memcpy(orb->request.command_block, cmd->cmnd, cmd->cmd_len);
|
|
|
|
orb->base.callback = complete_command_orb;
|
|
orb->base.request_bus =
|
|
dma_map_single(device->card->device, &orb->request,
|
|
sizeof(orb->request), DMA_TO_DEVICE);
|
|
if (dma_mapping_error(device->card->device, orb->base.request_bus))
|
|
goto out;
|
|
|
|
sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, generation,
|
|
lu->command_block_agent_address + SBP2_ORB_POINTER);
|
|
retval = 0;
|
|
out:
|
|
kref_put(&orb->base.kref, free_orb);
|
|
return retval;
|
|
}
|
|
|
|
static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
|
|
{
|
|
struct sbp2_logical_unit *lu = sdev->hostdata;
|
|
|
|
/* (Re-)Adding logical units via the SCSI stack is not supported. */
|
|
if (!lu)
|
|
return -ENOSYS;
|
|
|
|
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->tgt->workarounds & SBP2_WORKAROUND_INQUIRY_36)
|
|
sdev->inquiry_len = 36;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
|
|
{
|
|
struct sbp2_logical_unit *lu = sdev->hostdata;
|
|
|
|
sdev->use_10_for_rw = 1;
|
|
|
|
if (sbp2_param_exclusive_login)
|
|
sdev->manage_start_stop = 1;
|
|
|
|
if (sdev->type == TYPE_ROM)
|
|
sdev->use_10_for_ms = 1;
|
|
|
|
if (sdev->type == TYPE_DISK &&
|
|
lu->tgt->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
|
|
sdev->skip_ms_page_8 = 1;
|
|
|
|
if (lu->tgt->workarounds & SBP2_WORKAROUND_FIX_CAPACITY)
|
|
sdev->fix_capacity = 1;
|
|
|
|
if (lu->tgt->workarounds & SBP2_WORKAROUND_POWER_CONDITION)
|
|
sdev->start_stop_pwr_cond = 1;
|
|
|
|
if (lu->tgt->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;
|
|
}
|
|
|
|
/*
|
|
* Called by scsi stack when something has really gone wrong. Usually
|
|
* called when a command has timed-out for some reason.
|
|
*/
|
|
static int sbp2_scsi_abort(struct scsi_cmnd *cmd)
|
|
{
|
|
struct sbp2_logical_unit *lu = cmd->device->hostdata;
|
|
|
|
fw_notify("%s: sbp2_scsi_abort\n", lu->tgt->bus_id);
|
|
sbp2_agent_reset(lu);
|
|
sbp2_cancel_orbs(lu);
|
|
|
|
return SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* Format of /sys/bus/scsi/devices/.../ieee1394_id:
|
|
* u64 EUI-64 : u24 directory_ID : u16 LUN (all printed in hexadecimal)
|
|
*
|
|
* This is the concatenation of target port identifier and logical unit
|
|
* identifier as per SAM-2...SAM-4 annex A.
|
|
*/
|
|
static ssize_t
|
|
sbp2_sysfs_ieee1394_id_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct scsi_device *sdev = to_scsi_device(dev);
|
|
struct sbp2_logical_unit *lu;
|
|
|
|
if (!sdev)
|
|
return 0;
|
|
|
|
lu = sdev->hostdata;
|
|
|
|
return sprintf(buf, "%016llx:%06x:%04x\n",
|
|
(unsigned long long)lu->tgt->guid,
|
|
lu->tgt->directory_id, lu->lun);
|
|
}
|
|
|
|
static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL);
|
|
|
|
static struct device_attribute *sbp2_scsi_sysfs_attrs[] = {
|
|
&dev_attr_ieee1394_id,
|
|
NULL
|
|
};
|
|
|
|
static struct scsi_host_template scsi_driver_template = {
|
|
.module = THIS_MODULE,
|
|
.name = "SBP-2 IEEE-1394",
|
|
.proc_name = sbp2_driver_name,
|
|
.queuecommand = sbp2_scsi_queuecommand,
|
|
.slave_alloc = sbp2_scsi_slave_alloc,
|
|
.slave_configure = sbp2_scsi_slave_configure,
|
|
.eh_abort_handler = sbp2_scsi_abort,
|
|
.this_id = -1,
|
|
.sg_tablesize = SG_ALL,
|
|
.use_clustering = ENABLE_CLUSTERING,
|
|
.cmd_per_lun = 1,
|
|
.can_queue = 1,
|
|
.sdev_attrs = sbp2_scsi_sysfs_attrs,
|
|
};
|
|
|
|
MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
|
|
MODULE_DESCRIPTION("SCSI over IEEE1394");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);
|
|
|
|
/* Provide a module alias so root-on-sbp2 initrds don't break. */
|
|
#ifndef CONFIG_IEEE1394_SBP2_MODULE
|
|
MODULE_ALIAS("sbp2");
|
|
#endif
|
|
|
|
static int __init sbp2_init(void)
|
|
{
|
|
sbp2_wq = create_singlethread_workqueue(KBUILD_MODNAME);
|
|
if (!sbp2_wq)
|
|
return -ENOMEM;
|
|
|
|
return driver_register(&sbp2_driver.driver);
|
|
}
|
|
|
|
static void __exit sbp2_cleanup(void)
|
|
{
|
|
driver_unregister(&sbp2_driver.driver);
|
|
destroy_workqueue(sbp2_wq);
|
|
}
|
|
|
|
module_init(sbp2_init);
|
|
module_exit(sbp2_cleanup);
|