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- /*
- * SBP2 driver (SCSI over IEEE1394)
- *
- * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
- *
- * 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.
- */
- /*
- * The basic structure of this driver is based on the old storage driver,
- * drivers/ieee1394/sbp2.c, originally written by
- * James Goodwin <jamesg@filanet.com>
- * with later contributions and ongoing maintenance from
- * Ben Collins <bcollins@debian.org>,
- * Stefan Richter <stefanr@s5r6.in-berlin.de>
- * and many others.
- */
- #include <linux/blkdev.h>
- #include <linux/bug.h>
- #include <linux/completion.h>
- #include <linux/delay.h>
- #include <linux/device.h>
- #include <linux/dma-mapping.h>
- #include <linux/firewire.h>
- #include <linux/firewire-constants.h>
- #include <linux/init.h>
- #include <linux/jiffies.h>
- #include <linux/kernel.h>
- #include <linux/kref.h>
- #include <linux/list.h>
- #include <linux/mod_devicetable.h>
- #include <linux/module.h>
- #include <linux/moduleparam.h>
- #include <linux/scatterlist.h>
- #include <linux/slab.h>
- #include <linux/spinlock.h>
- #include <linux/string.h>
- #include <linux/stringify.h>
- #include <linux/workqueue.h>
- #include <asm/byteorder.h>
- #include <scsi/scsi.h>
- #include <scsi/scsi_cmnd.h>
- #include <scsi/scsi_device.h>
- #include <scsi/scsi_host.h>
- /*
- * 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.
- *
- * Concurrent logins are useful together with cluster filesystems.
- */
- static bool sbp2_param_exclusive_login = 1;
- module_param_named(exclusive_login, sbp2_param_exclusive_login, bool, 0644);
- MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device "
- "(default = Y, use N for concurrent initiators)");
- /*
- * Flags for firmware oddities
- *
- * - 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.
- */
- #define SBP2_WORKAROUND_128K_MAX_TRANS 0x1
- #define SBP2_WORKAROUND_INQUIRY_36 0x2
- #define SBP2_WORKAROUND_MODE_SENSE_8 0x4
- #define SBP2_WORKAROUND_FIX_CAPACITY 0x8
- #define SBP2_WORKAROUND_DELAY_INQUIRY 0x10
- #define SBP2_INQUIRY_DELAY 12
- #define SBP2_WORKAROUND_POWER_CONDITION 0x20
- #define SBP2_WORKAROUND_OVERRIDE 0x100
- static int sbp2_param_workarounds;
- module_param_named(workarounds, sbp2_param_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)");
- /*
- * We create one struct sbp2_logical_unit per SBP-2 Logical Unit Number Entry
- * and one struct scsi_device per sbp2_logical_unit.
- */
- struct sbp2_logical_unit {
- struct sbp2_target *tgt;
- struct list_head link;
- struct fw_address_handler address_handler;
- struct list_head orb_list;
- u64 command_block_agent_address;
- u16 lun;
- int login_id;
- /*
- * The generation is updated once we've logged in or reconnected
- * to the logical unit. Thus, I/O to the device will automatically
- * fail and get retried if it happens in a window where the device
- * is not ready, e.g. after a bus reset but before we reconnect.
- */
- int generation;
- int retries;
- work_func_t workfn;
- struct delayed_work work;
- bool has_sdev;
- bool blocked;
- };
- static void sbp2_queue_work(struct sbp2_logical_unit *lu, unsigned long delay)
- {
- queue_delayed_work(fw_workqueue, &lu->work, delay);
- }
- /*
- * We create one struct sbp2_target per IEEE 1212 Unit Directory
- * and one struct Scsi_Host per sbp2_target.
- */
- struct sbp2_target {
- struct fw_unit *unit;
- struct list_head lu_list;
- u64 management_agent_address;
- u64 guid;
- int directory_id;
- int node_id;
- int address_high;
- unsigned int workarounds;
- unsigned int mgt_orb_timeout;
- unsigned int max_payload;
- spinlock_t lock;
- int dont_block; /* counter for each logical unit */
- int blocked; /* ditto */
- };
- static struct fw_device *target_parent_device(struct sbp2_target *tgt)
- {
- return fw_parent_device(tgt->unit);
- }
- static const struct device *tgt_dev(const struct sbp2_target *tgt)
- {
- return &tgt->unit->device;
- }
- static const struct device *lu_dev(const struct sbp2_logical_unit *lu)
- {
- return &lu->tgt->unit->device;
- }
- /* Impossible login_id, to detect logout attempt before successful login */
- #define INVALID_LOGIN_ID 0x10000
- #define SBP2_ORB_TIMEOUT 2000U /* Timeout in ms */
- #define SBP2_ORB_NULL 0x80000000
- #define SBP2_RETRY_LIMIT 0xf /* 15 retries */
- #define SBP2_CYCLE_LIMIT (0xc8 << 12) /* 200 125us cycles */
- /*
- * There is no transport protocol limit to the CDB length, but we implement
- * a fixed length only. 16 bytes is enough for disks larger than 2 TB.
- */
- #define SBP2_MAX_CDB_SIZE 16
- /*
- * The maximum SBP-2 data buffer size is 0xffff. We quadlet-align this
- * for compatibility with earlier versions of this driver.
- */
- #define SBP2_MAX_SEG_SIZE 0xfffc
- /* Unit directory keys */
- #define SBP2_CSR_UNIT_CHARACTERISTICS 0x3a
- #define SBP2_CSR_FIRMWARE_REVISION 0x3c
- #define SBP2_CSR_LOGICAL_UNIT_NUMBER 0x14
- #define SBP2_CSR_UNIT_UNIQUE_ID 0x8d
- #define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4
- /* Management orb opcodes */
- #define SBP2_LOGIN_REQUEST 0x0
- #define SBP2_QUERY_LOGINS_REQUEST 0x1
- #define SBP2_RECONNECT_REQUEST 0x3
- #define SBP2_SET_PASSWORD_REQUEST 0x4
- #define SBP2_LOGOUT_REQUEST 0x7
- #define SBP2_ABORT_TASK_REQUEST 0xb
- #define SBP2_ABORT_TASK_SET 0xc
- #define SBP2_LOGICAL_UNIT_RESET 0xe
- #define SBP2_TARGET_RESET_REQUEST 0xf
- /* Offsets for command block agent registers */
- #define SBP2_AGENT_STATE 0x00
- #define SBP2_AGENT_RESET 0x04
- #define SBP2_ORB_POINTER 0x08
- #define SBP2_DOORBELL 0x10
- #define SBP2_UNSOLICITED_STATUS_ENABLE 0x14
- /* Status write response codes */
- #define SBP2_STATUS_REQUEST_COMPLETE 0x0
- #define SBP2_STATUS_TRANSPORT_FAILURE 0x1
- #define SBP2_STATUS_ILLEGAL_REQUEST 0x2
- #define SBP2_STATUS_VENDOR_DEPENDENT 0x3
- #define STATUS_GET_ORB_HIGH(v) ((v).status & 0xffff)
- #define STATUS_GET_SBP_STATUS(v) (((v).status >> 16) & 0xff)
- #define STATUS_GET_LEN(v) (((v).status >> 24) & 0x07)
- #define STATUS_GET_DEAD(v) (((v).status >> 27) & 0x01)
- #define STATUS_GET_RESPONSE(v) (((v).status >> 28) & 0x03)
- #define STATUS_GET_SOURCE(v) (((v).status >> 30) & 0x03)
- #define STATUS_GET_ORB_LOW(v) ((v).orb_low)
- #define STATUS_GET_DATA(v) ((v).data)
- struct sbp2_status {
- u32 status;
- u32 orb_low;
- u8 data[24];
- };
- struct sbp2_pointer {
- __be32 high;
- __be32 low;
- };
- struct sbp2_orb {
- struct fw_transaction t;
- struct kref kref;
- dma_addr_t request_bus;
- int rcode;
- void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status);
- struct sbp2_logical_unit *lu;
- struct list_head link;
- };
- #define MANAGEMENT_ORB_LUN(v) ((v))
- #define MANAGEMENT_ORB_FUNCTION(v) ((v) << 16)
- #define MANAGEMENT_ORB_RECONNECT(v) ((v) << 20)
- #define MANAGEMENT_ORB_EXCLUSIVE(v) ((v) ? 1 << 28 : 0)
- #define MANAGEMENT_ORB_REQUEST_FORMAT(v) ((v) << 29)
- #define MANAGEMENT_ORB_NOTIFY ((1) << 31)
- #define MANAGEMENT_ORB_RESPONSE_LENGTH(v) ((v))
- #define MANAGEMENT_ORB_PASSWORD_LENGTH(v) ((v) << 16)
- struct sbp2_management_orb {
- struct sbp2_orb base;
- struct {
- struct sbp2_pointer password;
- struct sbp2_pointer response;
- __be32 misc;
- __be32 length;
- struct sbp2_pointer status_fifo;
- } request;
- __be32 response[4];
- dma_addr_t response_bus;
- struct completion done;
- struct sbp2_status status;
- };
- struct sbp2_login_response {
- __be32 misc;
- struct sbp2_pointer command_block_agent;
- __be32 reconnect_hold;
- };
- #define COMMAND_ORB_DATA_SIZE(v) ((v))
- #define COMMAND_ORB_PAGE_SIZE(v) ((v) << 16)
- #define COMMAND_ORB_PAGE_TABLE_PRESENT ((1) << 19)
- #define COMMAND_ORB_MAX_PAYLOAD(v) ((v) << 20)
- #define COMMAND_ORB_SPEED(v) ((v) << 24)
- #define COMMAND_ORB_DIRECTION ((1) << 27)
- #define COMMAND_ORB_REQUEST_FORMAT(v) ((v) << 29)
- #define COMMAND_ORB_NOTIFY ((1) << 31)
- struct sbp2_command_orb {
- struct sbp2_orb base;
- struct {
- struct sbp2_pointer next;
- struct sbp2_pointer data_descriptor;
- __be32 misc;
- u8 command_block[SBP2_MAX_CDB_SIZE];
- } request;
- struct scsi_cmnd *cmd;
- struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8)));
- dma_addr_t page_table_bus;
- };
- #define SBP2_ROM_VALUE_WILDCARD ~0 /* match all */
- #define SBP2_ROM_VALUE_MISSING 0xff000000 /* not present in the unit dir. */
- /*
- * List of devices with known bugs.
- *
- * The firmware_revision field, masked with 0xffff00, is the best
- * indicator for the type of bridge chip of a device. It yields a few
- * false positives but this did not break correctly behaving devices
- * so far.
- */
- static const struct {
- u32 firmware_revision;
- u32 model;
- unsigned int workarounds;
- } sbp2_workarounds_table[] = {
- /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
- .firmware_revision = 0x002800,
- .model = 0x001010,
- .workarounds = SBP2_WORKAROUND_INQUIRY_36 |
- SBP2_WORKAROUND_MODE_SENSE_8 |
- SBP2_WORKAROUND_POWER_CONDITION,
- },
- /* DViCO Momobay FX-3A with TSB42AA9A bridge */ {
- .firmware_revision = 0x002800,
- .model = 0x000000,
- .workarounds = SBP2_WORKAROUND_POWER_CONDITION,
- },
- /* Initio bridges, actually only needed for some older ones */ {
- .firmware_revision = 0x000200,
- .model = SBP2_ROM_VALUE_WILDCARD,
- .workarounds = SBP2_WORKAROUND_INQUIRY_36,
- },
- /* PL-3507 bridge with Prolific firmware */ {
- .firmware_revision = 0x012800,
- .model = SBP2_ROM_VALUE_WILDCARD,
- .workarounds = SBP2_WORKAROUND_POWER_CONDITION,
- },
- /* Symbios bridge */ {
- .firmware_revision = 0xa0b800,
- .model = SBP2_ROM_VALUE_WILDCARD,
- .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS,
- },
- /* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ {
- .firmware_revision = 0x002600,
- .model = SBP2_ROM_VALUE_WILDCARD,
- .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS,
- },
- /*
- * iPod 2nd generation: needs 128k max transfer size workaround
- * iPod 3rd generation: needs fix capacity workaround
- */
- {
- .firmware_revision = 0x0a2700,
- .model = 0x000000,
- .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS |
- SBP2_WORKAROUND_FIX_CAPACITY,
- },
- /* iPod 4th generation */ {
- .firmware_revision = 0x0a2700,
- .model = 0x000021,
- .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
- },
- /* iPod mini */ {
- .firmware_revision = 0x0a2700,
- .model = 0x000022,
- .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
- },
- /* iPod mini */ {
- .firmware_revision = 0x0a2700,
- .model = 0x000023,
- .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
- },
- /* iPod Photo */ {
- .firmware_revision = 0x0a2700,
- .model = 0x00007e,
- .workarounds = SBP2_WORKAROUND_FIX_CAPACITY,
- }
- };
- static void free_orb(struct kref *kref)
- {
- struct sbp2_orb *orb = container_of(kref, struct sbp2_orb, kref);
- kfree(orb);
- }
- static void sbp2_status_write(struct fw_card *card, struct fw_request *request,
- int tcode, int destination, int source,
- int generation, unsigned long long offset,
- void *payload, size_t length, void *callback_data)
- {
- struct sbp2_logical_unit *lu = callback_data;
- struct sbp2_orb *orb;
- struct sbp2_status status;
- unsigned long flags;
- if (tcode != TCODE_WRITE_BLOCK_REQUEST ||
- length < 8 || length > sizeof(status)) {
- fw_send_response(card, request, RCODE_TYPE_ERROR);
- return;
- }
- status.status = be32_to_cpup(payload);
- status.orb_low = be32_to_cpup(payload + 4);
- memset(status.data, 0, sizeof(status.data));
- if (length > 8)
- memcpy(status.data, payload + 8, length - 8);
- if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) {
- dev_notice(lu_dev(lu),
- "non-ORB related status write, not handled\n");
- fw_send_response(card, request, RCODE_COMPLETE);
- return;
- }
- /* Lookup the orb corresponding to this status write. */
- spin_lock_irqsave(&lu->tgt->lock, flags);
- list_for_each_entry(orb, &lu->orb_list, link) {
- if (STATUS_GET_ORB_HIGH(status) == 0 &&
- STATUS_GET_ORB_LOW(status) == orb->request_bus) {
- orb->rcode = RCODE_COMPLETE;
- list_del(&orb->link);
- break;
- }
- }
- spin_unlock_irqrestore(&lu->tgt->lock, flags);
- if (&orb->link != &lu->orb_list) {
- orb->callback(orb, &status);
- kref_put(&orb->kref, free_orb); /* orb callback reference */
- } else {
- dev_err(lu_dev(lu), "status write for unknown ORB\n");
- }
- fw_send_response(card, request, RCODE_COMPLETE);
- }
- static void complete_transaction(struct fw_card *card, int rcode,
- void *payload, size_t length, void *data)
- {
- struct sbp2_orb *orb = data;
- unsigned long flags;
- /*
- * This is a little tricky. We can get the status write for
- * 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(&orb->lu->tgt->lock, flags);
- if (orb->rcode == -1)
- orb->rcode = rcode;
- if (orb->rcode != RCODE_COMPLETE) {
- list_del(&orb->link);
- spin_unlock_irqrestore(&orb->lu->tgt->lock, flags);
- orb->callback(orb, NULL);
- kref_put(&orb->kref, free_orb); /* orb callback reference */
- } else {
- spin_unlock_irqrestore(&orb->lu->tgt->lock, flags);
- }
- kref_put(&orb->kref, free_orb); /* transaction callback reference */
- }
- 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 = target_parent_device(lu->tgt);
- struct sbp2_pointer orb_pointer;
- unsigned long flags;
- orb_pointer.high = 0;
- orb_pointer.low = cpu_to_be32(orb->request_bus);
- orb->lu = lu;
- spin_lock_irqsave(&lu->tgt->lock, flags);
- list_add_tail(&orb->link, &lu->orb_list);
- spin_unlock_irqrestore(&lu->tgt->lock, flags);
- kref_get(&orb->kref); /* transaction callback reference */
- kref_get(&orb->kref); /* orb callback reference */
- fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST,
- node_id, generation, device->max_speed, offset,
- &orb_pointer, 8, complete_transaction, orb);
- }
- static int sbp2_cancel_orbs(struct sbp2_logical_unit *lu)
- {
- struct fw_device *device = target_parent_device(lu->tgt);
- struct sbp2_orb *orb, *next;
- struct list_head list;
- int retval = -ENOENT;
- INIT_LIST_HEAD(&list);
- spin_lock_irq(&lu->tgt->lock);
- list_splice_init(&lu->orb_list, &list);
- spin_unlock_irq(&lu->tgt->lock);
- 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);
- kref_put(&orb->kref, free_orb); /* orb callback reference */
- }
- 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 = target_parent_device(lu->tgt);
- 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_NOIO);
- 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) {
- dev_err(lu_dev(lu), "ORB reply timed out, rcode 0x%02x\n",
- orb->base.rcode);
- goto out;
- }
- if (orb->base.rcode != RCODE_COMPLETE) {
- dev_err(lu_dev(lu), "management write failed, rcode 0x%02x\n",
- orb->base.rcode);
- goto out;
- }
- if (STATUS_GET_RESPONSE(orb->status) != 0 ||
- STATUS_GET_SBP_STATUS(orb->status) != 0) {
- dev_err(lu_dev(lu), "error status: %d:%d\n",
- 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 = target_parent_device(lu->tgt);
- __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, 4);
- }
- 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 = target_parent_device(lu->tgt);
- 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, 4, complete_agent_reset_write_no_wait, t);
- }
- static inline void sbp2_allow_block(struct sbp2_target *tgt)
- {
- spin_lock_irq(&tgt->lock);
- --tgt->dont_block;
- spin_unlock_irq(&tgt->lock);
- }
- /*
- * 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 tgt->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 = target_parent_device(tgt)->card;
- struct Scsi_Host *shost =
- container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
- unsigned long flags;
- spin_lock_irqsave(&tgt->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(&tgt->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
- * tgt->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 = target_parent_device(tgt)->card;
- struct Scsi_Host *shost =
- container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
- bool unblock = false;
- spin_lock_irq(&tgt->lock);
- if (lu->blocked && lu->generation == card->generation) {
- lu->blocked = false;
- unblock = --tgt->blocked == 0;
- }
- spin_unlock_irq(&tgt->lock);
- 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
- * tgt->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 Scsi_Host *shost =
- container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
- spin_lock_irq(&tgt->lock);
- ++tgt->dont_block;
- spin_unlock_irq(&tgt->lock);
- 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);
- }
- /*
- * 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 = target_parent_device(lu->tgt);
- __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, 4);
- }
- 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 = target_parent_device(tgt);
- 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))
- return;
- 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 {
- dev_err(tgt_dev(tgt), "failed to login to LUN %04x\n",
- lu->lun);
- /* Let any waiting I/O fail from now on. */
- sbp2_unblock(lu->tgt);
- }
- return;
- }
- 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;
- dev_notice(tgt_dev(tgt), "logged in to LUN %04x (%d retries)\n",
- lu->lun, lu->retries);
- /* set appropriate retry limit(s) in BUSY_TIMEOUT register */
- sbp2_set_busy_timeout(lu);
- lu->workfn = sbp2_reconnect;
- sbp2_agent_reset(lu);
- /* This was a re-login. */
- if (lu->has_sdev) {
- sbp2_cancel_orbs(lu);
- sbp2_conditionally_unblock(lu);
- return;
- }
- 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(tgt);
- return;
- 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.
- */
- lu->workfn = sbp2_login;
- }
- 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 = target_parent_device(tgt);
- int generation, node_id, local_node_id;
- if (fw_device_is_shutdown(device))
- return;
- 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) {
- dev_err(tgt_dev(tgt), "failed to reconnect\n");
- lu->retries = 0;
- lu->workfn = sbp2_login;
- }
- sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
- return;
- }
- 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;
- dev_notice(tgt_dev(tgt), "reconnected to LUN %04x (%d retries)\n",
- lu->lun, lu->retries);
- sbp2_agent_reset(lu);
- sbp2_cancel_orbs(lu);
- sbp2_conditionally_unblock(lu);
- }
- static void sbp2_lu_workfn(struct work_struct *work)
- {
- struct sbp2_logical_unit *lu = container_of(to_delayed_work(work),
- struct sbp2_logical_unit, work);
- lu->workfn(work);
- }
- 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);
- lu->workfn = sbp2_login;
- INIT_DELAYED_WORK(&lu->work, sbp2_lu_workfn);
- list_add_tail(&lu->link, &tgt->lu_list);
- return 0;
- }
- static void sbp2_get_unit_unique_id(struct sbp2_target *tgt,
- const u32 *leaf)
- {
- if ((leaf[0] & 0xffff0000) == 0x00020000)
- tgt->guid = (u64)leaf[1] << 32 | leaf[2];
- }
- static int sbp2_scan_logical_unit_dir(struct sbp2_target *tgt,
- const 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, const u32 *directory,
- u32 *model, u32 *firmware_revision)
- {
- struct fw_csr_iterator ci;
- int key, value;
- 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 */
- tgt->mgt_orb_timeout = (value >> 8 & 0xff) * 500;
- break;
- case SBP2_CSR_LOGICAL_UNIT_NUMBER:
- if (sbp2_add_logical_unit(tgt, value) < 0)
- return -ENOMEM;
- break;
- case SBP2_CSR_UNIT_UNIQUE_ID:
- sbp2_get_unit_unique_id(tgt, ci.p - 1 + value);
- 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;
- }
- /*
- * Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be
- * provided in the config rom. Most devices do provide a value, which
- * we'll use for login management orbs, but with some sane limits.
- */
- static void sbp2_clamp_management_orb_timeout(struct sbp2_target *tgt)
- {
- unsigned int timeout = tgt->mgt_orb_timeout;
- if (timeout > 40000)
- dev_notice(tgt_dev(tgt), "%ds mgt_ORB_timeout limited to 40s\n",
- timeout / 1000);
- tgt->mgt_orb_timeout = clamp_val(timeout, 5000, 40000);
- }
- static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model,
- u32 firmware_revision)
- {
- int i;
- unsigned int w = sbp2_param_workarounds;
- if (w)
- dev_notice(tgt_dev(tgt),
- "Please notify linux1394-devel@lists.sf.net "
- "if you need the workarounds parameter\n");
- 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)
- dev_notice(tgt_dev(tgt), "workarounds 0x%x "
- "(firmware_revision 0x%06x, model_id 0x%06x)\n",
- w, firmware_revision, model);
- tgt->workarounds = w;
- }
- static struct scsi_host_template scsi_driver_template;
- static void sbp2_remove(struct fw_unit *unit);
- static int sbp2_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
- {
- struct fw_device *device = fw_parent_device(unit);
- struct sbp2_target *tgt;
- struct sbp2_logical_unit *lu;
- struct Scsi_Host *shost;
- u32 model, firmware_revision;
- /* cannot (or should not) handle targets on the local node */
- if (device->is_local)
- return -ENODEV;
- if (dma_get_max_seg_size(device->card->device) > SBP2_MAX_SEG_SIZE)
- WARN_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;
- dev_set_drvdata(&unit->device, tgt);
- tgt->unit = unit;
- INIT_LIST_HEAD(&tgt->lu_list);
- spin_lock_init(&tgt->lock);
- tgt->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
- if (fw_device_enable_phys_dma(device) < 0)
- goto fail_shost_put;
- shost->max_cmd_len = SBP2_MAX_CDB_SIZE;
- if (scsi_add_host_with_dma(shost, &unit->device,
- device->card->device) < 0)
- goto fail_shost_put;
- /* 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_remove;
- sbp2_clamp_management_orb_timeout(tgt);
- 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 = min3(device->max_speed + 7, 10U,
- 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_remove:
- sbp2_remove(unit);
- return -ENOMEM;
- fail_shost_put:
- scsi_host_put(shost);
- return -ENOMEM;
- }
- static void sbp2_update(struct fw_unit *unit)
- {
- struct sbp2_target *tgt = dev_get_drvdata(&unit->device);
- struct sbp2_logical_unit *lu;
- fw_device_enable_phys_dma(fw_parent_device(unit));
- /*
- * 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);
- }
- }
- static void sbp2_remove(struct fw_unit *unit)
- {
- struct fw_device *device = fw_parent_device(unit);
- struct sbp2_target *tgt = dev_get_drvdata(&unit->device);
- struct sbp2_logical_unit *lu, *next;
- struct Scsi_Host *shost =
- container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
- struct scsi_device *sdev;
- /* prevent deadlocks */
- sbp2_unblock(tgt);
- list_for_each_entry_safe(lu, next, &tgt->lu_list, link) {
- cancel_delayed_work_sync(&lu->work);
- 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);
- dev_notice(&unit->device, "released target %d:0:0\n", shost->host_no);
- scsi_host_put(shost);
- }
- #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
- #define SBP2_SW_VERSION_ENTRY 0x00010483
- static const struct ieee1394_device_id sbp2_id_table[] = {
- {
- .match_flags = IEEE1394_MATCH_SPECIFIER_ID |
- IEEE1394_MATCH_VERSION,
- .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY,
- .version = SBP2_SW_VERSION_ENTRY,
- },
- { }
- };
- static struct fw_driver sbp2_driver = {
- .driver = {
- .owner = THIS_MODULE,
- .name = KBUILD_MODNAME,
- .bus = &fw_bus_type,
- },
- .probe = sbp2_probe,
- .update = sbp2_update,
- .remove = sbp2_remove,
- .id_table = sbp2_id_table,
- };
- static void sbp2_unmap_scatterlist(struct device *card_device,
- struct sbp2_command_orb *orb)
- {
- scsi_dma_unmap(orb->cmd);
- if (orb->request.misc & cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT))
- dma_unmap_single(card_device, orb->page_table_bus,
- sizeof(orb->page_table), DMA_TO_DEVICE);
- }
- static unsigned int sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data)
- {
- int sam_status;
- int sfmt = (sbp2_status[0] >> 6) & 0x03;
- if (sfmt == 2 || sfmt == 3) {
- /*
- * Reserved for future standardization (2) or
- * Status block format vendor-dependent (3)
- */
- return DID_ERROR << 16;
- }
- sense_data[0] = 0x70 | sfmt | (sbp2_status[1] & 0x80);
- sense_data[1] = 0x0;
- sense_data[2] = ((sbp2_status[1] << 1) & 0xe0) | (sbp2_status[1] & 0x0f);
- 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 = target_parent_device(base_orb->lu->tgt);
- int result;
- if (status != NULL) {
- if (STATUS_GET_DEAD(*status))
- sbp2_agent_reset_no_wait(base_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(base_orb->lu);
- }
- dma_unmap_single(device->card->device, orb->base.request_bus,
- sizeof(orb->request), DMA_TO_DEVICE);
- sbp2_unmap_scatterlist(device->card->device, orb);
- orb->cmd->result = result;
- orb->cmd->scsi_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 = scsi_dma_map(orb->cmd);
- 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:
- scsi_dma_unmap(orb->cmd);
- fail:
- return -ENOMEM;
- }
- /* SCSI stack integration */
- static int sbp2_scsi_queuecommand(struct Scsi_Host *shost,
- struct scsi_cmnd *cmd)
- {
- struct sbp2_logical_unit *lu = cmd->device->hostdata;
- struct fw_device *device = target_parent_device(lu->tgt);
- struct sbp2_command_orb *orb;
- int generation, retval = SCSI_MLQUEUE_HOST_BUSY;
- orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
- if (orb == NULL)
- return SCSI_MLQUEUE_HOST_BUSY;
- /* Initialize rcode to something not RCODE_COMPLETE. */
- orb->base.rcode = -1;
- kref_init(&orb->base.kref);
- 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)) {
- sbp2_unmap_scatterlist(device->card->device, orb);
- 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 does not require any alignment, but we set it anyway
- * for compatibility with earlier versions of this driver.
- */
- 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_hw_sectors(sdev->request_queue, 128 * 1024 / 512);
- 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;
- dev_notice(lu_dev(lu), "sbp2_scsi_abort\n");
- 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",
- .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,
- .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. */
- MODULE_ALIAS("sbp2");
- static int __init sbp2_init(void)
- {
- return driver_register(&sbp2_driver.driver);
- }
- static void __exit sbp2_cleanup(void)
- {
- driver_unregister(&sbp2_driver.driver);
- }
- module_init(sbp2_init);
- module_exit(sbp2_cleanup);
|