--- /dev/null
+/*
+ * 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,
+ .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. */
+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);
Code Review / kvmfornfv.git / blobdiff