diff options
Diffstat (limited to 'drivers/firewire/fw-sbp2.c')
| -rw-r--r-- | drivers/firewire/fw-sbp2.c | 1646 |
1 files changed, 0 insertions, 1646 deletions
diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c deleted file mode 100644 index 62b4e47d0cc..00000000000 --- a/drivers/firewire/fw-sbp2.c +++ /dev/null @@ -1,1646 +0,0 @@ -/* - * 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/delay.h> -#include <linux/device.h> -#include <linux/dma-mapping.h> -#include <linux/kernel.h> -#include <linux/mod_devicetable.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/scatterlist.h> -#include <linux/string.h> -#include <linux/stringify.h> -#include <linux/timer.h> -#include <linux/workqueue.h> -#include <asm/system.h> - -#include <scsi/scsi.h> -#include <scsi/scsi_cmnd.h> -#include <scsi/scsi_device.h> -#include <scsi/scsi_host.h> - -#include "fw-device.h" -#include "fw-topology.h" -#include "fw-transaction.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. - * - * - 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_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) - ", 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; - int directory_id; - int node_id; - int address_high; - unsigned int workarounds; - unsigned int mgt_orb_timeout; - - int dont_block; /* counter for each logical unit */ - int blocked; /* ditto */ -}; - -/* - * 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_MAX_SG_ELEMENT_LENGTH 0xf000 -#define SBP2_RETRY_LIMIT 0xf /* 15 retries */ - -#define SBP2_DIRECTION_TO_MEDIA 0x0 -#define SBP2_DIRECTION_FROM_MEDIA 0x1 - -/* 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 { - u32 high; - u32 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; - u32 misc; - u32 length; - struct sbp2_pointer status_fifo; - } request; - __be32 response[4]; - dma_addr_t response_bus; - struct completion done; - struct sbp2_status status; -}; - -#define LOGIN_RESPONSE_GET_LOGIN_ID(v) ((v).misc & 0xffff) -#define LOGIN_RESPONSE_GET_LENGTH(v) (((v).misc >> 16) & 0xffff) - -struct sbp2_login_response { - u32 misc; - struct sbp2_pointer command_block_agent; - u32 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(v) ((v) << 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; - u32 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; -}; - -/* - * 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. We use ~0 as a wildcard, since the 24 bit values we get - * from the config rom can never match that. - */ -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, - }, - /* DViCO Momobay FX-3A with TSB42AA9A bridge */ { - .firmware_revision = 0x002800, - .model = 0x000000, - .workarounds = SBP2_WORKAROUND_DELAY_INQUIRY, - }, - /* Initio bridges, actually only needed for some older ones */ { - .firmware_revision = 0x000200, - .model = ~0, - .workarounds = SBP2_WORKAROUND_INQUIRY_36, - }, - /* Symbios bridge */ { - .firmware_revision = 0xa0b800, - .model = ~0, - .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, - }, - /* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ { - .firmware_revision = 0x002600, - .model = ~0, - .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, - }, - - /* - * There are iPods (2nd gen, 3rd gen) with model_id == 0, but - * these iPods do not feature the read_capacity bug according - * to one report. Read_capacity behaviour as well as model_id - * could change due to Apple-supplied firmware updates though. - */ - - /* iPod 4th generation. */ { - .firmware_revision = 0x0a2700, - .model = 0x000021, - .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 = fw_device(lu->tgt->unit->device.parent); - unsigned long flags; - - orb->pointer.high = 0; - orb->pointer.low = orb->request_bus; - fw_memcpy_to_be32(&orb->pointer, &orb->pointer, sizeof(orb->pointer)); - - spin_lock_irqsave(&device->card->lock, flags); - list_add_tail(&orb->link, &lu->orb_list); - spin_unlock_irqrestore(&device->card->lock, flags); - - /* Take a ref for the orb list and for the transaction callback. */ - kref_get(&orb->kref); - kref_get(&orb->kref); - - fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST, - node_id, generation, device->max_speed, offset, - &orb->pointer, sizeof(orb->pointer), - complete_transaction, orb); -} - -static int sbp2_cancel_orbs(struct sbp2_logical_unit *lu) -{ - struct fw_device *device = fw_device(lu->tgt->unit->device.parent); - struct sbp2_orb *orb, *next; - struct list_head list; - unsigned long flags; - int retval = -ENOENT; - - INIT_LIST_HEAD(&list); - spin_lock_irqsave(&device->card->lock, flags); - list_splice_init(&lu->orb_list, &list); - spin_unlock_irqrestore(&device->card->lock, flags); - - list_for_each_entry_safe(orb, next, &list, link) { - retval = 0; - if (fw_cancel_transaction(device->card, &orb->t) == 0) - continue; - - orb->rcode = RCODE_CANCELLED; - orb->callback(orb, NULL); - } - - return retval; -} - -static void -complete_management_orb(struct sbp2_orb *base_orb, struct sbp2_status *status) -{ - struct sbp2_management_orb *orb = - container_of(base_orb, struct sbp2_management_orb, base); - - if (status) - memcpy(&orb->status, status, sizeof(*status)); - complete(&orb->done); -} - -static int -sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id, - int generation, int function, int lun_or_login_id, - void *response) -{ - struct fw_device *device = fw_device(lu->tgt->unit->device.parent); - struct sbp2_management_orb *orb; - unsigned int timeout; - int retval = -ENOMEM; - - if (function == SBP2_LOGOUT_REQUEST && fw_device_is_shutdown(device)) - return 0; - - orb = kzalloc(sizeof(*orb), GFP_ATOMIC); - if (orb == NULL) - return -ENOMEM; - - kref_init(&orb->base.kref); - orb->response_bus = - dma_map_single(device->card->device, &orb->response, - sizeof(orb->response), DMA_FROM_DEVICE); - if (dma_mapping_error(orb->response_bus)) - goto fail_mapping_response; - - orb->request.response.high = 0; - orb->request.response.low = orb->response_bus; - - orb->request.misc = - MANAGEMENT_ORB_NOTIFY | - MANAGEMENT_ORB_FUNCTION(function) | - MANAGEMENT_ORB_LUN(lun_or_login_id); - orb->request.length = - MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response)); - - orb->request.status_fifo.high = lu->address_handler.offset >> 32; - orb->request.status_fifo.low = lu->address_handler.offset; - - if (function == SBP2_LOGIN_REQUEST) { - /* Ask for 2^2 == 4 seconds reconnect grace period */ - orb->request.misc |= - MANAGEMENT_ORB_RECONNECT(2) | - MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login); - timeout = lu->tgt->mgt_orb_timeout; - } else { - timeout = SBP2_ORB_TIMEOUT; - } - - fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request)); - - 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(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) - fw_memcpy_from_be32(response, - orb->response, sizeof(orb->response)); - kref_put(&orb->base.kref, free_orb); - - return retval; -} - -static void -complete_agent_reset_write(struct fw_card *card, int rcode, - void *payload, size_t length, void *done) -{ - complete(done); -} - -static void sbp2_agent_reset(struct sbp2_logical_unit *lu) -{ - struct fw_device *device = fw_device(lu->tgt->unit->device.parent); - DECLARE_COMPLETION_ONSTACK(done); - struct fw_transaction t; - static u32 z; - - 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, - &z, sizeof(z), complete_agent_reset_write, &done); - wait_for_completion(&done); -} - -static void -complete_agent_reset_write_no_wait(struct fw_card *card, int rcode, - void *payload, size_t length, void *data) -{ - kfree(data); -} - -static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu) -{ - struct fw_device *device = fw_device(lu->tgt->unit->device.parent); - struct fw_transaction *t; - static u32 z; - - 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, - &z, sizeof(z), complete_agent_reset_write_no_wait, t); -} - -static void sbp2_set_generation(struct sbp2_logical_unit *lu, int generation) -{ - struct fw_card *card = fw_device(lu->tgt->unit->device.parent)->card; - unsigned long flags; - - /* serialize with comparisons of lu->generation and card->generation */ - spin_lock_irqsave(&card->lock, flags); - lu->generation = generation; - spin_unlock_irqrestore(&card->lock, flags); -} - -static inline void sbp2_allow_block(struct sbp2_logical_unit *lu) -{ - /* - * We may access dont_block without taking card->lock here: - * All callers of sbp2_allow_block() and all callers of sbp2_unblock() - * are currently serialized against each other. - * And a wrong result in sbp2_conditionally_block()'s access of - * dont_block is rather harmless, it simply misses its first chance. - */ - --lu->tgt->dont_block; -} - -/* - * Blocks lu->tgt if all of the following conditions are met: - * - Login, INQUIRY, and high-level SCSI setup of all of the target's - * logical units have been finished (indicated by dont_block == 0). - * - lu->generation is stale. - * - * Note, scsi_block_requests() must be called while holding card->lock, - * otherwise it might foil sbp2_[conditionally_]unblock()'s attempt to - * unblock the target. - */ -static void sbp2_conditionally_block(struct sbp2_logical_unit *lu) -{ - struct sbp2_target *tgt = lu->tgt; - struct fw_card *card = fw_device(tgt->unit->device.parent)->card; - struct Scsi_Host *shost = - container_of((void *)tgt, struct Scsi_Host, hostdata[0]); - unsigned long flags; - - spin_lock_irqsave(&card->lock, flags); - if (!tgt->dont_block && !lu->blocked && - lu->generation != card->generation) { - lu->blocked = true; - if (++tgt->blocked == 1) { - scsi_block_requests(shost); - fw_notify("blocked %s\n", lu->tgt->bus_id); - } - } - spin_unlock_irqrestore(&card->lock, flags); -} - -/* - * Unblocks lu->tgt as soon as all its logical units can be unblocked. - * Note, it is harmless to run scsi_unblock_requests() outside the - * card->lock protected section. On the other hand, running it inside - * the section might clash with shost->host_lock. - */ -static void sbp2_conditionally_unblock(struct sbp2_logical_unit *lu) -{ - struct sbp2_target *tgt = lu->tgt; - struct fw_card *card = fw_device(tgt->unit->device.parent)->card; - struct Scsi_Host *shost = - container_of((void *)tgt, struct Scsi_Host, hostdata[0]); - unsigned long flags; - bool unblock = false; - - spin_lock_irqsave(&card->lock, flags); - if (lu->blocked && lu->generation == card->generation) { - lu->blocked = false; - unblock = --tgt->blocked == 0; - } - spin_unlock_irqrestore(&card->lock, flags); - - if (unblock) { - scsi_unblock_requests(shost); - fw_notify("unblocked %s\n", lu->tgt->bus_id); - } -} - -/* - * Prevents future blocking of tgt and unblocks it. - * Note, it is harmless to run scsi_unblock_requests() outside the - * card->lock protected section. On the other hand, running it inside - * the section might clash with shost->host_lock. - */ -static void sbp2_unblock(struct sbp2_target *tgt) -{ - struct fw_card *card = fw_device(tgt->unit->device.parent)->card; - struct Scsi_Host *shost = - container_of((void *)tgt, struct Scsi_Host, hostdata[0]); - unsigned long flags; - - spin_lock_irqsave(&card->lock, flags); - ++tgt->dont_block; - spin_unlock_irqrestore(&card->lock, flags); - - scsi_unblock_requests(shost); -} - -static int sbp2_lun2int(u16 lun) -{ - struct scsi_lun eight_bytes_lun; - - memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun)); - eight_bytes_lun.scsi_lun[0] = (lun >> 8) & 0xff; - eight_bytes_lun.scsi_lun[1] = lun & 0xff; - - return scsilun_to_int(&eight_bytes_lun); -} - -static void sbp2_release_target(struct kref *kref) -{ - struct sbp2_target *tgt = container_of(kref, struct sbp2_target, kref); - struct sbp2_logical_unit *lu, *next; - struct Scsi_Host *shost = - container_of((void *)tgt, struct Scsi_Host, hostdata[0]); - struct scsi_device *sdev; - struct fw_device *device = fw_device(tgt->unit->device.parent); - - /* prevent deadlocks */ - sbp2_unblock(tgt); - - list_for_each_entry_safe(lu, next, &tgt->lu_list, link) { - sdev = scsi_device_lookup(shost, 0, 0, sbp2_lun2int(lu->lun)); - if (sdev) { - scsi_remove_device(sdev); - scsi_device_put(sdev); - } - sbp2_send_management_orb(lu, tgt->node_id, lu->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\n", tgt->bus_id); - - put_device(&tgt->unit->device); - scsi_host_put(shost); - fw_device_put(device); -} - -static struct workqueue_struct *sbp2_wq; - -/* - * 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) -{ - if (queue_delayed_work(sbp2_wq, &lu->work, delay)) - kref_get(&lu->tgt->kref); -} - -static void sbp2_target_put(struct sbp2_target *tgt) -{ - kref_put(&tgt->kref, sbp2_release_target); -} - -static void -complete_set_busy_timeout(struct fw_card *card, int rcode, - void *payload, size_t length, void *done) -{ - complete(done); -} - -static void sbp2_set_busy_timeout(struct sbp2_logical_unit *lu) -{ - struct fw_device *device = fw_device(lu->tgt->unit->device.parent); - DECLARE_COMPLETION_ONSTACK(done); - struct fw_transaction t; - static __be32 busy_timeout; - - /* FIXME: we should try to set dual-phase cycle_limit too */ - busy_timeout = cpu_to_be32(SBP2_RETRY_LIMIT); - - fw_send_request(device->card, &t, TCODE_WRITE_QUADLET_REQUEST, - lu->tgt->node_id, lu->generation, device->max_speed, - CSR_REGISTER_BASE + CSR_BUSY_TIMEOUT, &busy_timeout, - sizeof(busy_timeout), complete_set_busy_timeout, &done); - wait_for_completion(&done); -} - -static void sbp2_reconnect(struct work_struct *work); - -static void sbp2_login(struct work_struct *work) -{ - struct sbp2_logical_unit *lu = - container_of(work, struct sbp2_logical_unit, work.work); - struct sbp2_target *tgt = lu->tgt; - struct fw_device *device = fw_device(tgt->unit->device.parent); - struct Scsi_Host *shost; - struct scsi_device *sdev; - struct sbp2_login_response response; - int generation, node_id, local_node_id; - - if (fw_device_is_shutdown(device)) - goto out; - - generation = device->generation; - smp_rmb(); /* node_id 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; - sbp2_set_generation(lu, generation); - - /* Get command block agent offset and login id. */ - lu->command_block_agent_address = - ((u64) (response.command_block_agent.high & 0xffff) << 32) | - response.command_block_agent.low; - lu->login_id = LOGIN_RESPONSE_GET_LOGIN_ID(response); - - 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->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: - if (sbp2_scan_logical_unit_dir(tgt, ci.p + 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 != ~0) - continue; - - w |= sbp2_workarounds_table[i].workarounds; - break; - } - out: - if (w) - fw_notify("Workarounds for %s: 0x%x " - "(firmware_revision 0x%06x, model_id 0x%06x)\n", - tgt->bus_id, w, firmware_revision, model); - tgt->workarounds = w; -} - -static struct scsi_host_template scsi_driver_template; - -static int sbp2_probe(struct device *dev) -{ - struct fw_unit *unit = fw_unit(dev); - struct fw_device *device = fw_device(unit->device.parent); - struct sbp2_target *tgt; - struct sbp2_logical_unit *lu; - struct Scsi_Host *shost; - u32 model, firmware_revision; - - shost = scsi_host_alloc(&scsi_driver_template, sizeof(*tgt)); - if (shost == NULL) - return -ENOMEM; - - tgt = (struct sbp2_target *)shost->hostdata; - unit->device.driver_data = tgt; - tgt->unit = unit; - kref_init(&tgt->kref); - INIT_LIST_HEAD(&tgt->lu_list); - tgt->bus_id = unit->device.bus_id; - - 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); - - /* Initialize to values that won't match anything in our table. */ - firmware_revision = 0xff000000; - model = 0xff000000; - - /* implicit directory ID */ - tgt->directory_id = ((unit->directory - device->config_rom) * 4 - + CSR_CONFIG_ROM) & 0xffffff; - - if (sbp2_scan_unit_dir(tgt, unit->directory, &model, - &firmware_revision) < 0) - goto fail_tgt_put; - - sbp2_init_workarounds(tgt, model, firmware_revision); - - get_device(&unit->device); - - /* 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, 0); - return 0; - - fail_tgt_put: - sbp2_target_put(tgt); - return -ENOMEM; - - fail_shost_put: - scsi_host_put(shost); - return -ENOMEM; -} - -static int sbp2_remove(struct device *dev) -{ - struct fw_unit *unit = fw_unit(dev); - struct sbp2_target *tgt = unit->device.driver_data; - - sbp2_target_put(tgt); - return 0; -} - -static void sbp2_reconnect(struct work_struct *work) -{ - struct sbp2_logical_unit *lu = - container_of(work, struct sbp2_logical_unit, work.work); - struct sbp2_target *tgt = lu->tgt; - struct fw_device *device = fw_device(tgt->unit->device.parent); - int generation, node_id, local_node_id; - - if (fw_device_is_shutdown(device)) - goto out; - - generation = device->generation; - smp_rmb(); /* node_id 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; - sbp2_set_generation(lu, generation); - - fw_notify("%s: reconnected to LUN %04x (%d retries)\n", - tgt->bus_id, lu->lun, lu->retries); - - sbp2_agent_reset(lu); - sbp2_cancel_orbs(lu); - sbp2_conditionally_unblock(lu); - out: - sbp2_target_put(tgt); -} - -static void sbp2_update(struct fw_unit *unit) -{ - struct sbp2_target *tgt = unit->device.driver_data; - struct sbp2_logical_unit *lu; - - fw_device_enable_phys_dma(fw_device(unit->device.parent)); - - /* - * Fw-core serializes sbp2_update() against sbp2_remove(). - * Iteration over tgt->lu_list is therefore safe here. - */ - list_for_each_entry(lu, &tgt->lu_list, link) { - sbp2_conditionally_block(lu); - lu->retries = 0; - sbp2_queue_work(lu, 0); - } -} - -#define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e -#define SBP2_SW_VERSION_ENTRY 0x00010483 - -static const struct fw_device_id sbp2_id_table[] = { - { - .match_flags = FW_MATCH_SPECIFIER_ID | FW_MATCH_VERSION, - .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY, - .version = SBP2_SW_VERSION_ENTRY, - }, - { } -}; - -static struct fw_driver sbp2_driver = { - .driver = { - .owner = THIS_MODULE, - .name = sbp2_driver_name, - .bus = &fw_bus_type, - .probe = sbp2_probe, - .remove = sbp2_remove, - }, - .update = sbp2_update, - .id_table = sbp2_id_table, -}; - -static unsigned int -sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data) -{ - int sam_status; - - sense_data[0] = 0x70; - sense_data[1] = 0x0; - sense_data[2] = sbp2_status[1]; - sense_data[3] = sbp2_status[4]; - sense_data[4] = sbp2_status[5]; - sense_data[5] = sbp2_status[6]; - sense_data[6] = sbp2_status[7]; - sense_data[7] = 10; - sense_data[8] = sbp2_status[8]; - sense_data[9] = sbp2_status[9]; - sense_data[10] = sbp2_status[10]; - sense_data[11] = sbp2_status[11]; - sense_data[12] = sbp2_status[2]; - sense_data[13] = sbp2_status[3]; - sense_data[14] = sbp2_status[12]; - sense_data[15] = sbp2_status[13]; - - sam_status = sbp2_status[0] & 0x3f; - - switch (sam_status) { - case SAM_STAT_GOOD: - case SAM_STAT_CHECK_CONDITION: - case SAM_STAT_CONDITION_MET: - case SAM_STAT_BUSY: - case SAM_STAT_RESERVATION_CONFLICT: - case SAM_STAT_COMMAND_TERMINATED: - return DID_OK << 16 | sam_status; - - default: - return DID_ERROR << 16; - } -} - -static void -complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status) -{ - struct sbp2_command_orb *orb = - container_of(base_orb, struct sbp2_command_orb, base); - struct fw_device *device = fw_device(orb->lu->tgt->unit->device.parent); - int result; - - if (status != NULL) { - if (STATUS_GET_DEAD(*status)) - sbp2_agent_reset_no_wait(orb->lu); - - switch (STATUS_GET_RESPONSE(*status)) { - case SBP2_STATUS_REQUEST_COMPLETE: - result = DID_OK << 16; - break; - case SBP2_STATUS_TRANSPORT_FAILURE: - result = DID_BUS_BUSY << 16; - break; - case SBP2_STATUS_ILLEGAL_REQUEST: - case SBP2_STATUS_VENDOR_DEPENDENT: - default: - result = DID_ERROR << 16; - break; - } - - if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1) - result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status), - orb->cmd->sense_buffer); - } else { - /* - * If the orb completes with status == NULL, something - * went wrong, typically a bus reset happened mid-orb - * or when sending the write (less likely). - */ - result = DID_BUS_BUSY << 16; - sbp2_conditionally_block(orb->lu); - } - - dma_unmap_single(device->card->device, orb->base.request_bus, - sizeof(orb->request), DMA_TO_DEVICE); - - if (scsi_sg_count(orb->cmd) > 0) - dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd), - scsi_sg_count(orb->cmd), - orb->cmd->sc_data_direction); - - if (orb->page_table_bus != 0) - dma_unmap_single(device->card->device, orb->page_table_bus, - sizeof(orb->page_table), DMA_TO_DEVICE); - - orb->cmd->result = result; - orb->done(orb->cmd); -} - -static int -sbp2_map_scatterlist(struct sbp2_command_orb *orb, struct fw_device *device, - struct sbp2_logical_unit *lu) -{ - struct scatterlist *sg; - int sg_len, l, i, j, count; - dma_addr_t sg_addr; - - sg = scsi_sglist(orb->cmd); - count = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd), - orb->cmd->sc_data_direction); - if (count == 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 (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) { - orb->request.data_descriptor.high = lu->tgt->address_high; - orb->request.data_descriptor.low = sg_dma_address(sg); - orb->request.misc |= COMMAND_ORB_DATA_SIZE(sg_dma_len(sg)); - return 0; - } - - /* - * Convert the scatterlist to an sbp2 page table. If any - * scatterlist entries are too big for sbp2, we split them as we - * go. Even if we ask the block I/O layer to not give us sg - * elements larger than 65535 bytes, some IOMMUs may merge sg elements - * during DMA mapping, and Linux currently doesn't prevent this. - */ - for (i = 0, j = 0; i < count; i++, sg = sg_next(sg)) { - sg_len = sg_dma_len(sg); - sg_addr = sg_dma_address(sg); - while (sg_len) { - /* FIXME: This won't get us out of the pinch. */ - if (unlikely(j >= ARRAY_SIZE(orb->page_table))) { - fw_error("page table overflow\n"); - goto fail_page_table; - } - l = min(sg_len, SBP2_MAX_SG_ELEMENT_LENGTH); - orb->page_table[j].low = sg_addr; - orb->page_table[j].high = (l << 16); - sg_addr += l; - sg_len -= l; - j++; - } - } - - fw_memcpy_to_be32(orb->page_table, orb->page_table, - sizeof(orb->page_table[0]) * j); - orb->page_table_bus = - dma_map_single(device->card->device, orb->page_table, - sizeof(orb->page_table), DMA_TO_DEVICE); - if (dma_mapping_error(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 = lu->tgt->address_high; - orb->request.data_descriptor.low = orb->page_table_bus; - orb->request.misc |= - COMMAND_ORB_PAGE_TABLE_PRESENT | - COMMAND_ORB_DATA_SIZE(j); - - return 0; - - fail_page_table: - dma_unmap_sg(device->card->device, sg, scsi_sg_count(orb->cmd), - orb->cmd->sc_data_direction); - fail: - return -ENOMEM; -} - -/* SCSI stack integration */ - -static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done) -{ - struct sbp2_logical_unit *lu = cmd->device->hostdata; - struct fw_device *device = fw_device(lu->tgt->unit->device.parent); - struct sbp2_command_orb *orb; - unsigned int max_payload; - int 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 = SBP2_ORB_NULL; - orb->request.next.low = 0x0; - /* - * At speed 100 we can do 512 bytes per packet, at speed 200, - * 1024 bytes per packet etc. 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. - */ - max_payload = min(device->max_speed + 7, - device->card->max_receive - 1); - orb->request.misc = - COMMAND_ORB_MAX_PAYLOAD(max_payload) | - COMMAND_ORB_SPEED(device->max_speed) | - COMMAND_ORB_NOTIFY; - - if (cmd->sc_data_direction == DMA_FROM_DEVICE) - orb->request.misc |= - COMMAND_ORB_DIRECTION(SBP2_DIRECTION_FROM_MEDIA); - else if (cmd->sc_data_direction == DMA_TO_DEVICE) - orb->request.misc |= - COMMAND_ORB_DIRECTION(SBP2_DIRECTION_TO_MEDIA); - - if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0) - goto out; - - fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request)); - - memset(orb->request.command_block, - 0, sizeof(orb->request.command_block)); - memcpy(orb->request.command_block, cmd->cmnd, COMMAND_SIZE(*cmd->cmnd)); - - 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(orb->base.request_bus)) - goto out; - - sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, lu->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; - - /* - * Update the dma alignment (minimum alignment requirements for - * start and end of DMA transfers) to be a sector - */ - blk_queue_update_dma_alignment(sdev->request_queue, 511); - - 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 (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_128K_MAX_TRANS) - blk_queue_max_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; - - 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; - struct fw_device *device; - - if (!sdev) - return 0; - - lu = sdev->hostdata; - device = fw_device(lu->tgt->unit->device.parent); - - return sprintf(buf, "%08x%08x:%06x:%04x\n", - device->config_rom[3], device->config_rom[4], - 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); |