diff options
Diffstat (limited to 'drivers/firewire/sbp2.c')
| -rw-r--r-- | drivers/firewire/sbp2.c | 1656 |
1 files changed, 1656 insertions, 0 deletions
diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c new file mode 100644 index 000000000000..24c45635376a --- /dev/null +++ b/drivers/firewire/sbp2.c @@ -0,0 +1,1656 @@ +/* + * 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 <asm/system.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 int 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)"); + +/* I don't know why the SCSI stack doesn't define something like this... */ +typedef void (*scsi_done_fn_t)(struct scsi_cmnd *); + +static const char sbp2_driver_name[] = "sbp2"; + +/* + * 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; + struct delayed_work work; + bool has_sdev; + bool blocked; +}; + +/* + * We create one struct sbp2_target per IEEE 1212 Unit Directory + * and one struct Scsi_Host per sbp2_target. + */ +struct sbp2_target { + struct kref kref; + struct fw_unit *unit; + const char *bus_id; + 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; + + int dont_block; /* counter for each logical unit */ + int blocked; /* ditto */ +}; + +static struct fw_device *target_device(struct sbp2_target *tgt) +{ + return fw_parent_device(tgt->unit); +} + +/* Impossible login_id, to detect logout attempt before successful login */ +#define INVALID_LOGIN_ID 0x10000 + +/* + * 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. + */ +#define SBP2_MIN_LOGIN_ORB_TIMEOUT 5000U /* Timeout in ms */ +#define SBP2_MAX_LOGIN_ORB_TIMEOUT 40000U /* Timeout in ms */ +#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 */ + +/* + * The default maximum s/g segment size of a FireWire controller is + * usually 0x10000, but SBP-2 only allows 0xffff. Since buffers have to + * be quadlet-aligned, we set the length limit to 0xffff & ~3. + */ +#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_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; + struct sbp2_pointer pointer; + void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status); + 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[12]; + } request; + struct scsi_cmnd *cmd; + scsi_done_fn_t done; + struct sbp2_logical_unit *lu; + + 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_DELAY_INQUIRY | + SBP2_WORKAROUND_POWER_CONDITION, + }, + /* Initio bridges, actually only needed for some older ones */ { + .firmware_revision = 0x000200, + .model = SBP2_ROM_VALUE_WILDCARD, + .workarounds = SBP2_WORKAROUND_INQUIRY_36, + }, + /* PL-3507 bridge with Prolific firmware */ { + .firmware_revision = 0x012800, + .model = SBP2_ROM_VALUE_WILDCARD, + .workarounds = SBP2_WORKAROUND_POWER_CONDITION, + }, + /* Symbios bridge */ { + .firmware_revision = 0xa0b800, + .model = SBP2_ROM_VALUE_WILDCARD, + .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, + }, + /* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ { + .firmware_revision = 0x002600, + .model = SBP2_ROM_VALUE_WILDCARD, + .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, + }, + /* + * iPod 2nd generation: needs 128k max transfer size workaround + * iPod 3rd generation: needs fix capacity workaround + */ + { + .firmware_revision = 0x0a2700, + .model = 0x000000, + .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS | + SBP2_WORKAROUND_FIX_CAPACITY, + }, + /* iPod 4th generation */ { + .firmware_revision = 0x0a2700, + .model = 0x000021, + .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, + }, + /* iPod mini */ { + .firmware_revision = 0x0a2700, + .model = 0x000022, + .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, + }, + /* iPod mini */ { + .firmware_revision = 0x0a2700, + .model = 0x000023, + .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, + }, + /* iPod Photo */ { + .firmware_revision = 0x0a2700, + .model = 0x00007e, + .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, + } +}; + +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, int speed, + 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; + size_t header_size; + unsigned long flags; + + if (tcode != TCODE_WRITE_BLOCK_REQUEST || + length == 0 || length > sizeof(status)) { + fw_send_response(card, request, RCODE_TYPE_ERROR); + return; + } + + header_size = min(length, 2 * sizeof(u32)); + fw_memcpy_from_be32(&status, payload, header_size); + if (length > header_size) + memcpy(status.data, payload + 8, length - header_size); + if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) { + fw_notify("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(&card->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(&card->lock, flags); + + if (&orb->link != &lu->orb_list) + orb->callback(orb, &status); + else + fw_error("status write for unknown orb\n"); + + kref_put(&orb->kref, free_orb); + + 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(&card->lock, flags); + + if (orb->rcode == -1) + orb->rcode = rcode; + if (orb->rcode != RCODE_COMPLETE) { + list_del(&orb->link); + spin_unlock_irqrestore(&card->lock, flags); + orb->callback(orb, NULL); + } else { + spin_unlock_irqrestore(&card->lock, flags); + } + + kref_put(&orb->kref, free_orb); +} + +static void sbp2_send_orb(struct sbp2_orb *orb, struct sbp2_logical_unit *lu, + int node_id, int generation, u64 offset) +{ + struct fw_device *device = target_device(lu->tgt); + unsigned long flags; + + orb->pointer.high = 0; + orb->pointer.low = cpu_to_be32(orb->request_bus); + + spin_lock_irqsave(&device->card->lock, flags); + list_add_tail(&orb->link, &lu->orb_list); + spin_unlock_irqrestore(&device->card->lock, flags); + + /* Take a ref for the orb list and for the transaction callback. */ + kref_get(&orb->kref); + kref_get(&orb->kref); + + fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST, + node_id, generation, device->max_speed, offset, + &orb->pointer, sizeof(orb->pointer), + complete_transaction, orb); +} + +static int sbp2_cancel_orbs(struct sbp2_logical_unit *lu) +{ + struct fw_device *device = target_device(lu->tgt); + struct sbp2_orb *orb, *next; + struct list_head list; + unsigned long flags; + int retval = -ENOENT; + + INIT_LIST_HEAD(&list); + spin_lock_irqsave(&device->card->lock, flags); + list_splice_init(&lu->orb_list, &list); + spin_unlock_irqrestore(&device->card->lock, flags); + + list_for_each_entry_safe(orb, next, &list, link) { + retval = 0; + if (fw_cancel_transaction(device->card, &orb->t) == 0) + continue; + + orb->rcode = RCODE_CANCELLED; + orb->callback(orb, NULL); + } + + return retval; +} + +static void complete_management_orb(struct sbp2_orb *base_orb, + struct sbp2_status *status) +{ + struct sbp2_management_orb *orb = + container_of(base_orb, struct sbp2_management_orb, base); + + if (status) + memcpy(&orb->status, status, sizeof(*status)); + complete(&orb->done); +} + +static int sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id, + int generation, int function, + int lun_or_login_id, void *response) +{ + struct fw_device *device = target_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_ATOMIC); + if (orb == NULL) + return -ENOMEM; + + kref_init(&orb->base.kref); + orb->response_bus = + dma_map_single(device->card->device, &orb->response, + sizeof(orb->response), DMA_FROM_DEVICE); + if (dma_mapping_error(device->card->device, orb->response_bus)) + goto fail_mapping_response; + + orb->request.response.high = 0; + orb->request.response.low = cpu_to_be32(orb->response_bus); + + orb->request.misc = cpu_to_be32( + MANAGEMENT_ORB_NOTIFY | + MANAGEMENT_ORB_FUNCTION(function) | + MANAGEMENT_ORB_LUN(lun_or_login_id)); + orb->request.length = cpu_to_be32( + MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response))); + + orb->request.status_fifo.high = + cpu_to_be32(lu->address_handler.offset >> 32); + orb->request.status_fifo.low = + cpu_to_be32(lu->address_handler.offset); + + if (function == SBP2_LOGIN_REQUEST) { + /* Ask for 2^2 == 4 seconds reconnect grace period */ + orb->request.misc |= cpu_to_be32( + MANAGEMENT_ORB_RECONNECT(2) | + MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login)); + timeout = lu->tgt->mgt_orb_timeout; + } else { + timeout = SBP2_ORB_TIMEOUT; + } + + init_completion(&orb->done); + orb->base.callback = complete_management_orb; + + orb->base.request_bus = + dma_map_single(device->card->device, &orb->request, + sizeof(orb->request), DMA_TO_DEVICE); + if (dma_mapping_error(device->card->device, orb->base.request_bus)) + goto fail_mapping_request; + + sbp2_send_orb(&orb->base, lu, node_id, generation, + lu->tgt->management_agent_address); + + wait_for_completion_timeout(&orb->done, msecs_to_jiffies(timeout)); + + retval = -EIO; + if (sbp2_cancel_orbs(lu) == 0) { + fw_error("%s: orb reply timed out, rcode=0x%02x\n", + lu->tgt->bus_id, orb->base.rcode); + goto out; + } + + if (orb->base.rcode != RCODE_COMPLETE) { + fw_error("%s: management write failed, rcode 0x%02x\n", + lu->tgt->bus_id, orb->base.rcode); + goto out; + } + + if (STATUS_GET_RESPONSE(orb->status) != 0 || + STATUS_GET_SBP_STATUS(orb->status) != 0) { + fw_error("%s: error status: %d:%d\n", lu->tgt->bus_id, + STATUS_GET_RESPONSE(orb->status), + STATUS_GET_SBP_STATUS(orb->status)); + goto out; + } + + retval = 0; + out: + dma_unmap_single(device->card->device, orb->base.request_bus, + sizeof(orb->request), DMA_TO_DEVICE); + fail_mapping_request: + dma_unmap_single(device->card->device, orb->response_bus, + sizeof(orb->response), DMA_FROM_DEVICE); + fail_mapping_response: + if (response) + memcpy(response, orb->response, sizeof(orb->response)); + kref_put(&orb->base.kref, free_orb); + + return retval; +} + +static void sbp2_agent_reset(struct sbp2_logical_unit *lu) +{ + struct fw_device *device = target_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, sizeof(d)); +} + +static void complete_agent_reset_write_no_wait(struct fw_card *card, + int rcode, void *payload, size_t length, void *data) +{ + kfree(data); +} + +static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu) +{ + struct fw_device *device = target_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, sizeof(d), complete_agent_reset_write_no_wait, t); +} + +static inline void sbp2_allow_block(struct sbp2_logical_unit *lu) +{ + /* + * We may access dont_block without taking card->lock here: + * All callers of sbp2_allow_block() and all callers of sbp2_unblock() + * are currently serialized against each other. + * And a wrong result in sbp2_conditionally_block()'s access of + * dont_block is rather harmless, it simply misses its first chance. + */ + --lu->tgt->dont_block; +} + +/* + * Blocks lu->tgt if all of the following conditions are met: + * - Login, INQUIRY, and high-level SCSI setup of all of the target's + * logical units have been finished (indicated by dont_block == 0). + * - lu->generation is stale. + * + * Note, scsi_block_requests() must be called while holding card->lock, + * otherwise it might foil sbp2_[conditionally_]unblock()'s attempt to + * unblock the target. + */ +static void sbp2_conditionally_block(struct sbp2_logical_unit *lu) +{ + struct sbp2_target *tgt = lu->tgt; + struct fw_card *card = target_device(tgt)->card; + struct Scsi_Host *shost = + container_of((void *)tgt, struct Scsi_Host, hostdata[0]); + unsigned long flags; + + spin_lock_irqsave(&card->lock, flags); + if (!tgt->dont_block && !lu->blocked && + lu->generation != card->generation) { + lu->blocked = true; + if (++tgt->blocked == 1) + scsi_block_requests(shost); + } + spin_unlock_irqrestore(&card->lock, flags); +} + +/* + * Unblocks lu->tgt as soon as all its logical units can be unblocked. + * Note, it is harmless to run scsi_unblock_requests() outside the + * card->lock protected section. On the other hand, running it inside + * the section might clash with shost->host_lock. + */ +static void sbp2_conditionally_unblock(struct sbp2_logical_unit *lu) +{ + struct sbp2_target *tgt = lu->tgt; + struct fw_card *card = target_device(tgt)->card; + struct Scsi_Host *shost = + container_of((void *)tgt, struct Scsi_Host, hostdata[0]); + unsigned long flags; + bool unblock = false; + + spin_lock_irqsave(&card->lock, flags); + if (lu->blocked && lu->generation == card->generation) { + lu->blocked = false; + unblock = --tgt->blocked == 0; + } + spin_unlock_irqrestore(&card->lock, flags); + + if (unblock) + scsi_unblock_requests(shost); +} + +/* + * Prevents future blocking of tgt and unblocks it. + * Note, it is harmless to run scsi_unblock_requests() outside the + * card->lock protected section. On the other hand, running it inside + * the section might clash with shost->host_lock. + */ +static void sbp2_unblock(struct sbp2_target *tgt) +{ + struct fw_card *card = target_device(tgt)->card; + struct Scsi_Host *shost = + container_of((void *)tgt, struct Scsi_Host, hostdata[0]); + unsigned long flags; + + spin_lock_irqsave(&card->lock, flags); + ++tgt->dont_block; + spin_unlock_irqrestore(&card->lock, flags); + + scsi_unblock_requests(shost); +} + +static int sbp2_lun2int(u16 lun) +{ + struct scsi_lun eight_bytes_lun; + + memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun)); + eight_bytes_lun.scsi_lun[0] = (lun >> 8) & 0xff; + eight_bytes_lun.scsi_lun[1] = lun & 0xff; + + return scsilun_to_int(&eight_bytes_lun); +} + +static void sbp2_release_target(struct kref *kref) +{ + struct sbp2_target *tgt = container_of(kref, struct sbp2_target, kref); + struct sbp2_logical_unit *lu, *next; + struct Scsi_Host *shost = + container_of((void *)tgt, struct Scsi_Host, hostdata[0]); + struct scsi_device *sdev; + struct fw_device *device = target_device(tgt); + + /* prevent deadlocks */ + sbp2_unblock(tgt); + + list_for_each_entry_safe(lu, next, &tgt->lu_list, link) { + sdev = scsi_device_lookup(shost, 0, 0, sbp2_lun2int(lu->lun)); + if (sdev) { + scsi_remove_device(sdev); + scsi_device_put(sdev); + } + if (lu->login_id != INVALID_LOGIN_ID) { + int generation, node_id; + /* + * tgt->node_id may be obsolete here if we failed + * during initial login or after a bus reset where + * the topology changed. + */ + generation = device->generation; + smp_rmb(); /* node_id vs. generation */ + node_id = device->node_id; + sbp2_send_management_orb(lu, node_id, generation, + SBP2_LOGOUT_REQUEST, + lu->login_id, NULL); + } + fw_core_remove_address_handler(&lu->address_handler); + list_del(&lu->link); + kfree(lu); + } + scsi_remove_host(shost); + fw_notify("released %s, target %d:0:0\n", tgt->bus_id, shost->host_no); + + fw_unit_put(tgt->unit); + scsi_host_put(shost); + fw_device_put(device); +} + +static struct workqueue_struct *sbp2_wq; + +static void sbp2_target_put(struct sbp2_target *tgt) +{ + kref_put(&tgt->kref, sbp2_release_target); +} + +/* + * Always get the target's kref when scheduling work on one its units. + * Each workqueue job is responsible to call sbp2_target_put() upon return. + */ +static void sbp2_queue_work(struct sbp2_logical_unit *lu, unsigned long delay) +{ + kref_get(&lu->tgt->kref); + if (!queue_delayed_work(sbp2_wq, &lu->work, delay)) + sbp2_target_put(lu->tgt); +} + +/* + * Write retransmit retry values into the BUSY_TIMEOUT register. + * - The single-phase retry protocol is supported by all SBP-2 devices, but the + * default retry_limit value is 0 (i.e. never retry transmission). We write a + * saner value after logging into the device. + * - The dual-phase retry protocol is optional to implement, and if not + * supported, writes to the dual-phase portion of the register will be + * ignored. We try to write the original 1394-1995 default here. + * - In the case of devices that are also SBP-3-compliant, all writes are + * ignored, as the register is read-only, but contains single-phase retry of + * 15, which is what we're trying to set for all SBP-2 device anyway, so this + * write attempt is safe and yields more consistent behavior for all devices. + * + * See section 8.3.2.3.5 of the 1394-1995 spec, section 6.2 of the SBP-2 spec, + * and section 6.4 of the SBP-3 spec for further details. + */ +static void sbp2_set_busy_timeout(struct sbp2_logical_unit *lu) +{ + struct fw_device *device = target_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, sizeof(d)); +} + +static void sbp2_reconnect(struct work_struct *work); + +static void sbp2_login(struct work_struct *work) +{ + struct sbp2_logical_unit *lu = + container_of(work, struct sbp2_logical_unit, work.work); + struct sbp2_target *tgt = lu->tgt; + struct fw_device *device = target_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)) + goto out; + + generation = device->generation; + smp_rmb(); /* node IDs must not be older than generation */ + node_id = device->node_id; + local_node_id = device->card->node_id; + + /* If this is a re-login attempt, log out, or we might be rejected. */ + if (lu->has_sdev) + sbp2_send_management_orb(lu, device->node_id, generation, + SBP2_LOGOUT_REQUEST, lu->login_id, NULL); + + if (sbp2_send_management_orb(lu, node_id, generation, + SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) { + if (lu->retries++ < 5) { + sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5)); + } else { + fw_error("%s: failed to login to LUN %04x\n", + tgt->bus_id, lu->lun); + /* Let any waiting I/O fail from now on. */ + sbp2_unblock(lu->tgt); + } + goto out; + } + + tgt->node_id = node_id; + tgt->address_high = local_node_id << 16; + smp_wmb(); /* node IDs must not be older than generation */ + lu->generation = generation; + + lu->command_block_agent_address = + ((u64)(be32_to_cpu(response.command_block_agent.high) & 0xffff) + << 32) | be32_to_cpu(response.command_block_agent.low); + lu->login_id = be32_to_cpu(response.misc) & 0xffff; + + fw_notify("%s: logged in to LUN %04x (%d retries)\n", + tgt->bus_id, lu->lun, lu->retries); + + /* set appropriate retry limit(s) in BUSY_TIMEOUT register */ + sbp2_set_busy_timeout(lu); + + PREPARE_DELAYED_WORK(&lu->work, sbp2_reconnect); + sbp2_agent_reset(lu); + + /* This was a re-login. */ + if (lu->has_sdev) { + sbp2_cancel_orbs(lu); + sbp2_conditionally_unblock(lu); + goto out; + } + + if (lu->tgt->workarounds & SBP2_WORKAROUND_DELAY_INQUIRY) + ssleep(SBP2_INQUIRY_DELAY); + + shost = container_of((void *)tgt, struct Scsi_Host, hostdata[0]); + sdev = __scsi_add_device(shost, 0, 0, sbp2_lun2int(lu->lun), lu); + /* + * FIXME: We are unable to perform reconnects while in sbp2_login(). + * Therefore __scsi_add_device() will get into trouble if a bus reset + * happens in parallel. It will either fail or leave us with an + * unusable sdev. As a workaround we check for this and retry the + * whole login and SCSI probing. + */ + + /* Reported error during __scsi_add_device() */ + if (IS_ERR(sdev)) + goto out_logout_login; + + /* Unreported error during __scsi_add_device() */ + smp_rmb(); /* get current card generation */ + if (generation != device->card->generation) { + scsi_remove_device(sdev); + scsi_device_put(sdev); + goto out_logout_login; + } + + /* No error during __scsi_add_device() */ + lu->has_sdev = true; + scsi_device_put(sdev); + sbp2_allow_block(lu); + goto out; + + out_logout_login: + smp_rmb(); /* generation may have changed */ + generation = device->generation; + smp_rmb(); /* node_id must not be older than generation */ + + sbp2_send_management_orb(lu, device->node_id, generation, + SBP2_LOGOUT_REQUEST, lu->login_id, NULL); + /* + * If a bus reset happened, sbp2_update will have requeued + * lu->work already. Reset the work from reconnect to login. + */ + PREPARE_DELAYED_WORK(&lu->work, sbp2_login); + out: + sbp2_target_put(tgt); +} + +static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry) +{ + struct sbp2_logical_unit *lu; + + lu = kmalloc(sizeof(*lu), GFP_KERNEL); + if (!lu) + return -ENOMEM; + + lu->address_handler.length = 0x100; + lu->address_handler.address_callback = sbp2_status_write; + lu->address_handler.callback_data = lu; + + if (fw_core_add_address_handler(&lu->address_handler, + &fw_high_memory_region) < 0) { + kfree(lu); + return -ENOMEM; + } + + lu->tgt = tgt; + lu->lun = lun_entry & 0xffff; + lu->login_id = INVALID_LOGIN_ID; + lu->retries = 0; + lu->has_sdev = false; + lu->blocked = false; + ++tgt->dont_block; + INIT_LIST_HEAD(&lu->orb_list); + INIT_DELAYED_WORK(&lu->work, sbp2_login); + + list_add_tail(&lu->link, &tgt->lu_list); + return 0; +} + +static int sbp2_scan_logical_unit_dir(struct sbp2_target *tgt, u32 *directory) +{ + struct fw_csr_iterator ci; + int key, value; + + fw_csr_iterator_init(&ci, directory); + while (fw_csr_iterator_next(&ci, &key, &value)) + if (key == SBP2_CSR_LOGICAL_UNIT_NUMBER && + sbp2_add_logical_unit(tgt, value) < 0) + return -ENOMEM; + return 0; +} + +static int sbp2_scan_unit_dir(struct sbp2_target *tgt, u32 *directory, + u32 *model, u32 *firmware_revision) +{ + struct fw_csr_iterator ci; + int key, value; + unsigned int timeout; + + fw_csr_iterator_init(&ci, directory); + while (fw_csr_iterator_next(&ci, &key, &value)) { + switch (key) { + + case CSR_DEPENDENT_INFO | CSR_OFFSET: + tgt->management_agent_address = + CSR_REGISTER_BASE + 4 * value; + break; + + case CSR_DIRECTORY_ID: + tgt->directory_id = value; + break; + + case CSR_MODEL: + *model = value; + break; + + case SBP2_CSR_FIRMWARE_REVISION: + *firmware_revision = value; + break; + + case SBP2_CSR_UNIT_CHARACTERISTICS: + /* the timeout value is stored in 500ms units */ + timeout = ((unsigned int) value >> 8 & 0xff) * 500; + timeout = max(timeout, SBP2_MIN_LOGIN_ORB_TIMEOUT); + tgt->mgt_orb_timeout = + min(timeout, SBP2_MAX_LOGIN_ORB_TIMEOUT); + + if (timeout > tgt->mgt_orb_timeout) + fw_notify("%s: config rom contains %ds " + "management ORB timeout, limiting " + "to %ds\n", tgt->bus_id, + timeout / 1000, + tgt->mgt_orb_timeout / 1000); + break; + + case SBP2_CSR_LOGICAL_UNIT_NUMBER: + if (sbp2_add_logical_unit(tgt, value) < 0) + return -ENOMEM; + break; + + case SBP2_CSR_LOGICAL_UNIT_DIRECTORY: + /* Adjust for the increment in the iterator */ + if (sbp2_scan_logical_unit_dir(tgt, ci.p - 1 + value) < 0) + return -ENOMEM; + break; + } + } + return 0; +} + +static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model, + u32 firmware_revision) +{ + int i; + unsigned int w = sbp2_param_workarounds; + + if (w) + fw_notify("Please notify linux1394-devel@lists.sourceforge.net " + "if you need the workarounds parameter for %s\n", + tgt->bus_id); + + if (w & SBP2_WORKAROUND_OVERRIDE) + goto out; + + for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) { + + if (sbp2_workarounds_table[i].firmware_revision != + (firmware_revision & 0xffffff00)) + continue; + + if (sbp2_workarounds_table[i].model != model && + sbp2_workarounds_table[i].model != SBP2_ROM_VALUE_WILDCARD) + continue; + + w |= sbp2_workarounds_table[i].workarounds; + break; + } + out: + if (w) + fw_notify("Workarounds for %s: 0x%x " + "(firmware_revision 0x%06x, model_id 0x%06x)\n", + tgt->bus_id, w, firmware_revision, model); + tgt->workarounds = w; +} + +static struct scsi_host_template scsi_driver_template; + +static int sbp2_probe(struct device *dev) +{ + struct fw_unit *unit = fw_unit(dev); + struct fw_device *device = fw_parent_device(unit); + struct sbp2_target *tgt; + struct sbp2_logical_unit *lu; + struct Scsi_Host *shost; + u32 model, firmware_revision; + + if (dma_get_max_seg_size(device->card->device) > SBP2_MAX_SEG_SIZE) + BUG_ON(dma_set_max_seg_size(device->card->device, + SBP2_MAX_SEG_SIZE)); + + shost = scsi_host_alloc(&scsi_driver_template, sizeof(*tgt)); + if (shost == NULL) + return -ENOMEM; + + tgt = (struct sbp2_target *)shost->hostdata; + dev_set_drvdata(&unit->device, tgt); + tgt->unit = unit; + kref_init(&tgt->kref); + INIT_LIST_HEAD(&tgt->lu_list); + tgt->bus_id = dev_name(&unit->device); + tgt->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4]; + + if (fw_device_enable_phys_dma(device) < 0) + goto fail_shost_put; + + if (scsi_add_host(shost, &unit->device) < 0) + goto fail_shost_put; + + fw_device_get(device); + fw_unit_get(unit); + + /* implicit directory ID */ + tgt->directory_id = ((unit->directory - device->config_rom) * 4 + + CSR_CONFIG_ROM) & 0xffffff; + + firmware_revision = SBP2_ROM_VALUE_MISSING; + model = SBP2_ROM_VALUE_MISSING; + + if (sbp2_scan_unit_dir(tgt, unit->directory, &model, + &firmware_revision) < 0) + goto fail_tgt_put; + + sbp2_init_workarounds(tgt, model, firmware_revision); + + /* + * At S100 we can do 512 bytes per packet, at S200 1024 bytes, + * and so on up to 4096 bytes. The SBP-2 max_payload field + * specifies the max payload size as 2 ^ (max_payload + 2), so + * if we set this to max_speed + 7, we get the right value. + */ + tgt->max_payload = min(device->max_speed + 7, 10U); + tgt->max_payload = min(tgt->max_payload, device->card->max_receive - 1); + + /* Do the login in a workqueue so we can easily reschedule retries. */ + list_for_each_entry(lu, &tgt->lu_list, link) + sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5)); + return 0; + + fail_tgt_put: + sbp2_target_put(tgt); + return -ENOMEM; + + fail_shost_put: + scsi_host_put(shost); + return -ENOMEM; +} + +static int sbp2_remove(struct device *dev) +{ + struct fw_unit *unit = fw_unit(dev); + struct sbp2_target *tgt = dev_get_drvdata(&unit->device); + + sbp2_target_put(tgt); + return 0; +} + +static void sbp2_reconnect(struct work_struct *work) +{ + struct sbp2_logical_unit *lu = + container_of(work, struct sbp2_logical_unit, work.work); + struct sbp2_target *tgt = lu->tgt; + struct fw_device *device = target_device(tgt); + int generation, node_id, local_node_id; + + if (fw_device_is_shutdown(device)) + goto out; + + generation = device->generation; + smp_rmb(); /* node IDs must not be older than generation */ + node_id = device->node_id; + local_node_id = device->card->node_id; + + if (sbp2_send_management_orb(lu, node_id, generation, + SBP2_RECONNECT_REQUEST, + lu->login_id, NULL) < 0) { + /* + * If reconnect was impossible even though we are in the + * current generation, fall back and try to log in again. + * + * We could check for "Function rejected" status, but + * looking at the bus generation as simpler and more general. + */ + smp_rmb(); /* get current card generation */ + if (generation == device->card->generation || + lu->retries++ >= 5) { + fw_error("%s: failed to reconnect\n", tgt->bus_id); + lu->retries = 0; + PREPARE_DELAYED_WORK(&lu->work, sbp2_login); + } + sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5)); + goto out; + } + + tgt->node_id = node_id; + tgt->address_high = local_node_id << 16; + smp_wmb(); /* node IDs must not be older than generation */ + lu->generation = generation; + + fw_notify("%s: reconnected to LUN %04x (%d retries)\n", + tgt->bus_id, lu->lun, lu->retries); + + sbp2_agent_reset(lu); + sbp2_cancel_orbs(lu); + sbp2_conditionally_unblock(lu); + out: + sbp2_target_put(tgt); +} + +static void sbp2_update(struct fw_unit *unit) +{ + struct sbp2_target *tgt = 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); + } +} + +#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 = sbp2_driver_name, + .bus = &fw_bus_type, + .probe = sbp2_probe, + .remove = sbp2_remove, + }, + .update = sbp2_update, + .id_table = sbp2_id_table, +}; + +static void sbp2_unmap_scatterlist(struct device *card_device, + struct sbp2_command_orb *orb) +{ + if (scsi_sg_count(orb->cmd)) + dma_unmap_sg(card_device, scsi_sglist(orb->cmd), + scsi_sg_count(orb->cmd), + orb->cmd->sc_data_direction); + + 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; + + sense_data[0] = 0x70; + sense_data[1] = 0x0; + sense_data[2] = sbp2_status[1]; + sense_data[3] = sbp2_status[4]; + sense_data[4] = sbp2_status[5]; + sense_data[5] = sbp2_status[6]; + sense_data[6] = sbp2_status[7]; + sense_data[7] = 10; + sense_data[8] = sbp2_status[8]; + sense_data[9] = sbp2_status[9]; + sense_data[10] = sbp2_status[10]; + sense_data[11] = sbp2_status[11]; + sense_data[12] = sbp2_status[2]; + sense_data[13] = sbp2_status[3]; + sense_data[14] = sbp2_status[12]; + sense_data[15] = sbp2_status[13]; + + sam_status = sbp2_status[0] & 0x3f; + + switch (sam_status) { + case SAM_STAT_GOOD: + case SAM_STAT_CHECK_CONDITION: + case SAM_STAT_CONDITION_MET: + case SAM_STAT_BUSY: + case SAM_STAT_RESERVATION_CONFLICT: + case SAM_STAT_COMMAND_TERMINATED: + return DID_OK << 16 | sam_status; + + default: + return DID_ERROR << 16; + } +} + +static void complete_command_orb(struct sbp2_orb *base_orb, + struct sbp2_status *status) +{ + struct sbp2_command_orb *orb = + container_of(base_orb, struct sbp2_command_orb, base); + struct fw_device *device = target_device(orb->lu->tgt); + int result; + + if (status != NULL) { + if (STATUS_GET_DEAD(*status)) + sbp2_agent_reset_no_wait(orb->lu); + + switch (STATUS_GET_RESPONSE(*status)) { + case SBP2_STATUS_REQUEST_COMPLETE: + result = DID_OK << 16; + break; + case SBP2_STATUS_TRANSPORT_FAILURE: + result = DID_BUS_BUSY << 16; + break; + case SBP2_STATUS_ILLEGAL_REQUEST: + case SBP2_STATUS_VENDOR_DEPENDENT: + default: + result = DID_ERROR << 16; + break; + } + + if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1) + result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status), + orb->cmd->sense_buffer); + } else { + /* + * If the orb completes with status == NULL, something + * went wrong, typically a bus reset happened mid-orb + * or when sending the write (less likely). + */ + result = DID_BUS_BUSY << 16; + sbp2_conditionally_block(orb->lu); + } + + dma_unmap_single(device->card->device, orb->base.request_bus, + sizeof(orb->request), DMA_TO_DEVICE); + sbp2_unmap_scatterlist(device->card->device, orb); + + orb->cmd->result = result; + orb->done(orb->cmd); +} + +static int sbp2_map_scatterlist(struct sbp2_command_orb *orb, + struct fw_device *device, struct sbp2_logical_unit *lu) +{ + struct scatterlist *sg = scsi_sglist(orb->cmd); + int i, n; + + n = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd), + orb->cmd->sc_data_direction); + if (n == 0) + goto fail; + + /* + * Handle the special case where there is only one element in + * the scatter list by converting it to an immediate block + * request. This is also a workaround for broken devices such + * as the second generation iPod which doesn't support page + * tables. + */ + if (n == 1) { + orb->request.data_descriptor.high = + cpu_to_be32(lu->tgt->address_high); + orb->request.data_descriptor.low = + cpu_to_be32(sg_dma_address(sg)); + orb->request.misc |= + cpu_to_be32(COMMAND_ORB_DATA_SIZE(sg_dma_len(sg))); + return 0; + } + + for_each_sg(sg, sg, n, i) { + orb->page_table[i].high = cpu_to_be32(sg_dma_len(sg) << 16); + orb->page_table[i].low = cpu_to_be32(sg_dma_address(sg)); + } + + orb->page_table_bus = + dma_map_single(device->card->device, orb->page_table, + sizeof(orb->page_table), DMA_TO_DEVICE); + if (dma_mapping_error(device->card->device, orb->page_table_bus)) + goto fail_page_table; + + /* + * The data_descriptor pointer is the one case where we need + * to fill in the node ID part of the address. All other + * pointers assume that the data referenced reside on the + * initiator (i.e. us), but data_descriptor can refer to data + * on other nodes so we need to put our ID in descriptor.high. + */ + orb->request.data_descriptor.high = cpu_to_be32(lu->tgt->address_high); + orb->request.data_descriptor.low = cpu_to_be32(orb->page_table_bus); + orb->request.misc |= cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT | + COMMAND_ORB_DATA_SIZE(n)); + + return 0; + + fail_page_table: + dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd), + scsi_sg_count(orb->cmd), orb->cmd->sc_data_direction); + fail: + return -ENOMEM; +} + +/* SCSI stack integration */ + +static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done) +{ + struct sbp2_logical_unit *lu = cmd->device->hostdata; + struct fw_device *device = target_device(lu->tgt); + struct sbp2_command_orb *orb; + int generation, retval = SCSI_MLQUEUE_HOST_BUSY; + + /* + * Bidirectional commands are not yet implemented, and unknown + * transfer direction not handled. + */ + if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) { + fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n"); + cmd->result = DID_ERROR << 16; + done(cmd); + return 0; + } + + orb = kzalloc(sizeof(*orb), GFP_ATOMIC); + if (orb == NULL) { + fw_notify("failed to alloc orb\n"); + return SCSI_MLQUEUE_HOST_BUSY; + } + + /* Initialize rcode to something not RCODE_COMPLETE. */ + orb->base.rcode = -1; + kref_init(&orb->base.kref); + + orb->lu = lu; + orb->done = done; + orb->cmd = cmd; + + orb->request.next.high = cpu_to_be32(SBP2_ORB_NULL); + orb->request.misc = cpu_to_be32( + COMMAND_ORB_MAX_PAYLOAD(lu->tgt->max_payload) | + COMMAND_ORB_SPEED(device->max_speed) | + COMMAND_ORB_NOTIFY); + + if (cmd->sc_data_direction == DMA_FROM_DEVICE) + orb->request.misc |= cpu_to_be32(COMMAND_ORB_DIRECTION); + + generation = device->generation; + smp_rmb(); /* sbp2_map_scatterlist looks at tgt->address_high */ + + if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0) + goto out; + + memcpy(orb->request.command_block, cmd->cmnd, cmd->cmd_len); + + orb->base.callback = complete_command_orb; + orb->base.request_bus = + dma_map_single(device->card->device, &orb->request, + sizeof(orb->request), DMA_TO_DEVICE); + if (dma_mapping_error(device->card->device, orb->base.request_bus)) { + 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 requires quadlet alignment of the data buffers. */ + blk_queue_update_dma_alignment(sdev->request_queue, 4 - 1); + + if (lu->tgt->workarounds & SBP2_WORKAROUND_INQUIRY_36) + sdev->inquiry_len = 36; + + return 0; +} + +static int sbp2_scsi_slave_configure(struct scsi_device *sdev) +{ + struct sbp2_logical_unit *lu = sdev->hostdata; + + sdev->use_10_for_rw = 1; + + if (sbp2_param_exclusive_login) + sdev->manage_start_stop = 1; + + if (sdev->type == TYPE_ROM) + sdev->use_10_for_ms = 1; + + if (sdev->type == TYPE_DISK && + lu->tgt->workarounds & SBP2_WORKAROUND_MODE_SENSE_8) + sdev->skip_ms_page_8 = 1; + + if (lu->tgt->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) + sdev->fix_capacity = 1; + + if (lu->tgt->workarounds & SBP2_WORKAROUND_POWER_CONDITION) + sdev->start_stop_pwr_cond = 1; + + if (lu->tgt->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS) + blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512); + + blk_queue_max_segment_size(sdev->request_queue, SBP2_MAX_SEG_SIZE); + + return 0; +} + +/* + * Called by scsi stack when something has really gone wrong. Usually + * called when a command has timed-out for some reason. + */ +static int sbp2_scsi_abort(struct scsi_cmnd *cmd) +{ + struct sbp2_logical_unit *lu = cmd->device->hostdata; + + fw_notify("%s: sbp2_scsi_abort\n", lu->tgt->bus_id); + sbp2_agent_reset(lu); + sbp2_cancel_orbs(lu); + + return SUCCESS; +} + +/* + * Format of /sys/bus/scsi/devices/.../ieee1394_id: + * u64 EUI-64 : u24 directory_ID : u16 LUN (all printed in hexadecimal) + * + * This is the concatenation of target port identifier and logical unit + * identifier as per SAM-2...SAM-4 annex A. + */ +static ssize_t sbp2_sysfs_ieee1394_id_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct scsi_device *sdev = to_scsi_device(dev); + struct sbp2_logical_unit *lu; + + if (!sdev) + return 0; + + lu = sdev->hostdata; + + return sprintf(buf, "%016llx:%06x:%04x\n", + (unsigned long long)lu->tgt->guid, + lu->tgt->directory_id, lu->lun); +} + +static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL); + +static struct device_attribute *sbp2_scsi_sysfs_attrs[] = { + &dev_attr_ieee1394_id, + NULL +}; + +static struct scsi_host_template scsi_driver_template = { + .module = THIS_MODULE, + .name = "SBP-2 IEEE-1394", + .proc_name = sbp2_driver_name, + .queuecommand = sbp2_scsi_queuecommand, + .slave_alloc = sbp2_scsi_slave_alloc, + .slave_configure = sbp2_scsi_slave_configure, + .eh_abort_handler = sbp2_scsi_abort, + .this_id = -1, + .sg_tablesize = SG_ALL, + .use_clustering = ENABLE_CLUSTERING, + .cmd_per_lun = 1, + .can_queue = 1, + .sdev_attrs = sbp2_scsi_sysfs_attrs, +}; + +MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>"); +MODULE_DESCRIPTION("SCSI over IEEE1394"); +MODULE_LICENSE("GPL"); +MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table); + +/* Provide a module alias so root-on-sbp2 initrds don't break. */ +#ifndef CONFIG_IEEE1394_SBP2_MODULE +MODULE_ALIAS("sbp2"); +#endif + +static int __init sbp2_init(void) +{ + sbp2_wq = create_singlethread_workqueue(KBUILD_MODNAME); + if (!sbp2_wq) + return -ENOMEM; + + return driver_register(&sbp2_driver.driver); +} + +static void __exit sbp2_cleanup(void) +{ + driver_unregister(&sbp2_driver.driver); + destroy_workqueue(sbp2_wq); +} + +module_init(sbp2_init); +module_exit(sbp2_cleanup); |