/* * sbp2.c - SBP-2 protocol driver for IEEE-1394 * * Copyright (C) 2000 James Goodwin, Filanet Corporation (www.filanet.com) * jamesg@filanet.com (JSG) * * Copyright (C) 2003 Ben Collins * * 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. */ /* * Brief Description: * * This driver implements the Serial Bus Protocol 2 (SBP-2) over IEEE-1394 * under Linux. The SBP-2 driver is implemented as an IEEE-1394 high-level * driver. It also registers as a SCSI lower-level driver in order to accept * SCSI commands for transport using SBP-2. * * You may access any attached SBP-2 storage devices as if they were SCSI * devices (e.g. mount /dev/sda1, fdisk, mkfs, etc.). * * Current Issues: * * - Error Handling: SCSI aborts and bus reset requests are handled somewhat * but the code needs additional debugging. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA #include /* for bus_to_virt */ #endif #include #include #include #include #include #include "csr1212.h" #include "highlevel.h" #include "hosts.h" #include "ieee1394.h" #include "ieee1394_core.h" #include "ieee1394_hotplug.h" #include "ieee1394_transactions.h" #include "ieee1394_types.h" #include "nodemgr.h" #include "sbp2.h" /* * Module load parameter definitions */ /* * Change max_speed on module load if you have a bad IEEE-1394 * controller that has trouble running 2KB packets at 400mb. * * NOTE: On certain OHCI parts I have seen short packets on async transmit * (probably due to PCI latency/throughput issues with the part). You can * bump down the speed if you are running into problems. */ static int max_speed = IEEE1394_SPEED_MAX; module_param(max_speed, int, 0644); MODULE_PARM_DESC(max_speed, "Force max speed (3 = 800mb, 2 = 400mb, 1 = 200mb, 0 = 100mb)"); /* * Set serialize_io to 1 if you'd like only one scsi command sent * down to us at a time (debugging). This might be necessary for very * badly behaved sbp2 devices. * * TODO: Make this configurable per device. */ static int serialize_io = 1; module_param(serialize_io, int, 0444); MODULE_PARM_DESC(serialize_io, "Serialize I/O coming from scsi drivers (default = 1, faster = 0)"); /* * Bump up max_sectors if you'd like to support very large sized * transfers. Please note that some older sbp2 bridge chips are broken for * transfers greater or equal to 128KB. Default is a value of 255 * sectors, or just under 128KB (at 512 byte sector size). I can note that * the Oxsemi sbp2 chipsets have no problems supporting very large * transfer sizes. */ static int max_sectors = SBP2_MAX_SECTORS; module_param(max_sectors, int, 0444); MODULE_PARM_DESC(max_sectors, "Change max sectors per I/O supported (default = " __stringify(SBP2_MAX_SECTORS) ")"); /* * Exclusive login to sbp2 device? In most cases, the sbp2 driver should * do an exclusive login, as it's generally unsafe to have two hosts * talking to a single sbp2 device at the same time (filesystem coherency, * etc.). If you're running an sbp2 device that supports multiple logins, * and you're either running read-only filesystems or some sort of special * filesystem supporting multiple hosts, e.g. OpenGFS, Oracle Cluster * File System, or Lustre, then set exclusive_login to zero. * * 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. */ static int exclusive_login = 1; module_param(exclusive_login, int, 0644); MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device (default = 1)"); /* * If any of the following workarounds is required for your device to work, * please submit the kernel messages logged by sbp2 to the linux1394-devel * mailing list. * * - 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. * * - 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. */ static int sbp2_default_workarounds; module_param_named(workarounds, sbp2_default_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) ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE) ", or a combination)"); /* * Export information about protocols/devices supported by this driver. */ static struct ieee1394_device_id sbp2_id_table[] = { { .match_flags = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION, .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY & 0xffffff, .version = SBP2_SW_VERSION_ENTRY & 0xffffff}, {} }; MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table); /* * Debug levels, configured via kernel config, or enable here. */ #define CONFIG_IEEE1394_SBP2_DEBUG 0 /* #define CONFIG_IEEE1394_SBP2_DEBUG_ORBS */ /* #define CONFIG_IEEE1394_SBP2_DEBUG_DMA */ /* #define CONFIG_IEEE1394_SBP2_DEBUG 1 */ /* #define CONFIG_IEEE1394_SBP2_DEBUG 2 */ /* #define CONFIG_IEEE1394_SBP2_PACKET_DUMP */ #ifdef CONFIG_IEEE1394_SBP2_DEBUG_ORBS #define SBP2_ORB_DEBUG(fmt, args...) HPSB_ERR("sbp2(%s): "fmt, __FUNCTION__, ## args) static u32 global_outstanding_command_orbs = 0; #define outstanding_orb_incr global_outstanding_command_orbs++ #define outstanding_orb_decr global_outstanding_command_orbs-- #else #define SBP2_ORB_DEBUG(fmt, args...) do {} while (0) #define outstanding_orb_incr do {} while (0) #define outstanding_orb_decr do {} while (0) #endif #ifdef CONFIG_IEEE1394_SBP2_DEBUG_DMA #define SBP2_DMA_ALLOC(fmt, args...) \ HPSB_ERR("sbp2(%s)alloc(%d): "fmt, __FUNCTION__, \ ++global_outstanding_dmas, ## args) #define SBP2_DMA_FREE(fmt, args...) \ HPSB_ERR("sbp2(%s)free(%d): "fmt, __FUNCTION__, \ --global_outstanding_dmas, ## args) static u32 global_outstanding_dmas = 0; #else #define SBP2_DMA_ALLOC(fmt, args...) do {} while (0) #define SBP2_DMA_FREE(fmt, args...) do {} while (0) #endif #if CONFIG_IEEE1394_SBP2_DEBUG >= 2 #define SBP2_DEBUG(fmt, args...) HPSB_ERR("sbp2: "fmt, ## args) #define SBP2_INFO(fmt, args...) HPSB_ERR("sbp2: "fmt, ## args) #define SBP2_NOTICE(fmt, args...) HPSB_ERR("sbp2: "fmt, ## args) #define SBP2_WARN(fmt, args...) HPSB_ERR("sbp2: "fmt, ## args) #elif CONFIG_IEEE1394_SBP2_DEBUG == 1 #define SBP2_DEBUG(fmt, args...) HPSB_DEBUG("sbp2: "fmt, ## args) #define SBP2_INFO(fmt, args...) HPSB_INFO("sbp2: "fmt, ## args) #define SBP2_NOTICE(fmt, args...) HPSB_NOTICE("sbp2: "fmt, ## args) #define SBP2_WARN(fmt, args...) HPSB_WARN("sbp2: "fmt, ## args) #else #define SBP2_DEBUG(fmt, args...) do {} while (0) #define SBP2_INFO(fmt, args...) HPSB_INFO("sbp2: "fmt, ## args) #define SBP2_NOTICE(fmt, args...) HPSB_NOTICE("sbp2: "fmt, ## args) #define SBP2_WARN(fmt, args...) HPSB_WARN("sbp2: "fmt, ## args) #endif #define SBP2_ERR(fmt, args...) HPSB_ERR("sbp2: "fmt, ## args) #define SBP2_DEBUG_ENTER() SBP2_DEBUG("%s", __FUNCTION__) /* * Globals */ static void sbp2scsi_complete_all_commands(struct scsi_id_instance_data *scsi_id, u32 status); static void sbp2scsi_complete_command(struct scsi_id_instance_data *scsi_id, u32 scsi_status, struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)); static struct scsi_host_template scsi_driver_template; static const u8 sbp2_speedto_max_payload[] = { 0x7, 0x8, 0x9, 0xA, 0xB, 0xC }; static void sbp2_host_reset(struct hpsb_host *host); static int sbp2_probe(struct device *dev); static int sbp2_remove(struct device *dev); static int sbp2_update(struct unit_directory *ud); static struct hpsb_highlevel sbp2_highlevel = { .name = SBP2_DEVICE_NAME, .host_reset = sbp2_host_reset, }; static struct hpsb_address_ops sbp2_ops = { .write = sbp2_handle_status_write }; #ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA static struct hpsb_address_ops sbp2_physdma_ops = { .read = sbp2_handle_physdma_read, .write = sbp2_handle_physdma_write, }; #endif static struct hpsb_protocol_driver sbp2_driver = { .name = "SBP2 Driver", .id_table = sbp2_id_table, .update = sbp2_update, .driver = { .name = SBP2_DEVICE_NAME, .bus = &ieee1394_bus_type, .probe = sbp2_probe, .remove = sbp2_remove, }, }; /* * 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_id; unsigned workarounds; } sbp2_workarounds_table[] = { /* DViCO Momobay CX-1 with TSB42AA9 bridge */ { .firmware_revision = 0x002800, .model_id = 0x001010, .workarounds = SBP2_WORKAROUND_INQUIRY_36 | SBP2_WORKAROUND_MODE_SENSE_8, }, /* Initio bridges, actually only needed for some older ones */ { .firmware_revision = 0x000200, .workarounds = SBP2_WORKAROUND_INQUIRY_36, }, /* Symbios bridge */ { .firmware_revision = 0xa0b800, .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, }, /* * Note about the following Apple iPod blacklist entries: * * There are iPods (2nd gen, 3rd gen) with model_id==0. Since our * matching logic treats 0 as a wildcard, we cannot match this ID * without rewriting the matching routine. Fortunately 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_id = 0x000021, .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, }, /* iPod mini */ { .firmware_revision = 0x0a2700, .model_id = 0x000023, .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, }, /* iPod Photo */ { .firmware_revision = 0x0a2700, .model_id = 0x00007e, .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, } }; /************************************** * General utility functions **************************************/ #ifndef __BIG_ENDIAN /* * Converts a buffer from be32 to cpu byte ordering. Length is in bytes. */ static inline void sbp2util_be32_to_cpu_buffer(void *buffer, int length) { u32 *temp = buffer; for (length = (length >> 2); length--; ) temp[length] = be32_to_cpu(temp[length]); return; } /* * Converts a buffer from cpu to be32 byte ordering. Length is in bytes. */ static inline void sbp2util_cpu_to_be32_buffer(void *buffer, int length) { u32 *temp = buffer; for (length = (length >> 2); length--; ) temp[length] = cpu_to_be32(temp[length]); return; } #else /* BIG_ENDIAN */ /* Why waste the cpu cycles? */ #define sbp2util_be32_to_cpu_buffer(x,y) do {} while (0) #define sbp2util_cpu_to_be32_buffer(x,y) do {} while (0) #endif #ifdef CONFIG_IEEE1394_SBP2_PACKET_DUMP /* * Debug packet dump routine. Length is in bytes. */ static void sbp2util_packet_dump(void *buffer, int length, char *dump_name, u32 dump_phys_addr) { int i; unsigned char *dump = buffer; if (!dump || !length || !dump_name) return; if (dump_phys_addr) printk("[%s, 0x%x]", dump_name, dump_phys_addr); else printk("[%s]", dump_name); for (i = 0; i < length; i++) { if (i > 0x3f) { printk("\n ..."); break; } if ((i & 0x3) == 0) printk(" "); if ((i & 0xf) == 0) printk("\n "); printk("%02x ", (int)dump[i]); } printk("\n"); return; } #else #define sbp2util_packet_dump(w,x,y,z) do {} while (0) #endif static DECLARE_WAIT_QUEUE_HEAD(access_wq); /* * Waits for completion of an SBP-2 access request. * Returns nonzero if timed out or prematurely interrupted. */ static int sbp2util_access_timeout(struct scsi_id_instance_data *scsi_id, int timeout) { long leftover = wait_event_interruptible_timeout( access_wq, scsi_id->access_complete, timeout); scsi_id->access_complete = 0; return leftover <= 0; } /* Frees an allocated packet */ static void sbp2_free_packet(struct hpsb_packet *packet) { hpsb_free_tlabel(packet); hpsb_free_packet(packet); } /* This is much like hpsb_node_write(), except it ignores the response * subaction and returns immediately. Can be used from interrupts. */ static int sbp2util_node_write_no_wait(struct node_entry *ne, u64 addr, quadlet_t *buffer, size_t length) { struct hpsb_packet *packet; packet = hpsb_make_writepacket(ne->host, ne->nodeid, addr, buffer, length); if (!packet) return -ENOMEM; hpsb_set_packet_complete_task(packet, (void (*)(void *))sbp2_free_packet, packet); hpsb_node_fill_packet(ne, packet); if (hpsb_send_packet(packet) < 0) { sbp2_free_packet(packet); return -EIO; } return 0; } static void sbp2util_notify_fetch_agent(struct scsi_id_instance_data *scsi_id, u64 offset, quadlet_t *data, size_t len) { /* * There is a small window after a bus reset within which the node * entry's generation is current but the reconnect wasn't completed. */ if (unlikely(atomic_read(&scsi_id->state) == SBP2LU_STATE_IN_RESET)) return; if (hpsb_node_write(scsi_id->ne, scsi_id->sbp2_command_block_agent_addr + offset, data, len)) SBP2_ERR("sbp2util_notify_fetch_agent failed."); /* * Now accept new SCSI commands, unless a bus reset happended during * hpsb_node_write. */ if (likely(atomic_read(&scsi_id->state) != SBP2LU_STATE_IN_RESET)) scsi_unblock_requests(scsi_id->scsi_host); } static void sbp2util_write_orb_pointer(struct work_struct *work) { struct scsi_id_instance_data *scsi_id = container_of(work, struct scsi_id_instance_data, protocol_work.work); quadlet_t data[2]; data[0] = ORB_SET_NODE_ID(scsi_id->hi->host->node_id); data[1] = scsi_id->last_orb_dma; sbp2util_cpu_to_be32_buffer(data, 8); sbp2util_notify_fetch_agent(scsi_id, SBP2_ORB_POINTER_OFFSET, data, 8); } static void sbp2util_write_doorbell(struct work_struct *work) { struct scsi_id_instance_data *scsi_id = container_of(work, struct scsi_id_instance_data, protocol_work.work); sbp2util_notify_fetch_agent(scsi_id, SBP2_DOORBELL_OFFSET, NULL, 4); } /* * This function is called to create a pool of command orbs used for * command processing. It is called when a new sbp2 device is detected. */ static int sbp2util_create_command_orb_pool(struct scsi_id_instance_data *scsi_id) { struct sbp2scsi_host_info *hi = scsi_id->hi; int i; unsigned long flags, orbs; struct sbp2_command_info *command; orbs = serialize_io ? 2 : SBP2_MAX_CMDS; spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags); for (i = 0; i < orbs; i++) { command = kzalloc(sizeof(*command), GFP_ATOMIC); if (!command) { spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags); return -ENOMEM; } command->command_orb_dma = pci_map_single(hi->host->pdev, &command->command_orb, sizeof(struct sbp2_command_orb), PCI_DMA_TODEVICE); SBP2_DMA_ALLOC("single command orb DMA"); command->sge_dma = pci_map_single(hi->host->pdev, &command->scatter_gather_element, sizeof(command->scatter_gather_element), PCI_DMA_BIDIRECTIONAL); SBP2_DMA_ALLOC("scatter_gather_element"); INIT_LIST_HEAD(&command->list); list_add_tail(&command->list, &scsi_id->sbp2_command_orb_completed); } spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags); return 0; } /* * This function is called to delete a pool of command orbs. */ static void sbp2util_remove_command_orb_pool(struct scsi_id_instance_data *scsi_id) { struct hpsb_host *host = scsi_id->hi->host; struct list_head *lh, *next; struct sbp2_command_info *command; unsigned long flags; spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags); if (!list_empty(&scsi_id->sbp2_command_orb_completed)) { list_for_each_safe(lh, next, &scsi_id->sbp2_command_orb_completed) { command = list_entry(lh, struct sbp2_command_info, list); /* Release our generic DMA's */ pci_unmap_single(host->pdev, command->command_orb_dma, sizeof(struct sbp2_command_orb), PCI_DMA_TODEVICE); SBP2_DMA_FREE("single command orb DMA"); pci_unmap_single(host->pdev, command->sge_dma, sizeof(command->scatter_gather_element), PCI_DMA_BIDIRECTIONAL); SBP2_DMA_FREE("scatter_gather_element"); kfree(command); } } spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags); return; } /* * This function finds the sbp2_command for a given outstanding command * orb.Only looks at the inuse list. */ static struct sbp2_command_info *sbp2util_find_command_for_orb( struct scsi_id_instance_data *scsi_id, dma_addr_t orb) { struct sbp2_command_info *command; unsigned long flags; spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags); if (!list_empty(&scsi_id->sbp2_command_orb_inuse)) { list_for_each_entry(command, &scsi_id->sbp2_command_orb_inuse, list) { if (command->command_orb_dma == orb) { spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags); return command; } } } spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags); SBP2_ORB_DEBUG("could not match command orb %x", (unsigned int)orb); return NULL; } /* * This function finds the sbp2_command for a given outstanding SCpnt. * Only looks at the inuse list. * Must be called with scsi_id->sbp2_command_orb_lock held. */ static struct sbp2_command_info *sbp2util_find_command_for_SCpnt( struct scsi_id_instance_data *scsi_id, void *SCpnt) { struct sbp2_command_info *command; if (!list_empty(&scsi_id->sbp2_command_orb_inuse)) list_for_each_entry(command, &scsi_id->sbp2_command_orb_inuse, list) if (command->Current_SCpnt == SCpnt) return command; return NULL; } /* * This function allocates a command orb used to send a scsi command. */ static struct sbp2_command_info *sbp2util_allocate_command_orb( struct scsi_id_instance_data *scsi_id, struct scsi_cmnd *Current_SCpnt, void (*Current_done)(struct scsi_cmnd *)) { struct list_head *lh; struct sbp2_command_info *command = NULL; unsigned long flags; spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags); if (!list_empty(&scsi_id->sbp2_command_orb_completed)) { lh = scsi_id->sbp2_command_orb_completed.next; list_del(lh); command = list_entry(lh, struct sbp2_command_info, list); command->Current_done = Current_done; command->Current_SCpnt = Current_SCpnt; list_add_tail(&command->list, &scsi_id->sbp2_command_orb_inuse); } else { SBP2_ERR("%s: no orbs available", __FUNCTION__); } spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags); return command; } /* Free our DMA's */ static void sbp2util_free_command_dma(struct sbp2_command_info *command) { struct scsi_id_instance_data *scsi_id = (struct scsi_id_instance_data *)command->Current_SCpnt->device->host->hostdata[0]; struct hpsb_host *host; if (!scsi_id) { SBP2_ERR("%s: scsi_id == NULL", __FUNCTION__); return; } host = scsi_id->ud->ne->host; if (command->cmd_dma) { if (command->dma_type == CMD_DMA_SINGLE) { pci_unmap_single(host->pdev, command->cmd_dma, command->dma_size, command->dma_dir); SBP2_DMA_FREE("single bulk"); } else if (command->dma_type == CMD_DMA_PAGE) { pci_unmap_page(host->pdev, command->cmd_dma, command->dma_size, command->dma_dir); SBP2_DMA_FREE("single page"); } /* XXX: Check for CMD_DMA_NONE bug */ command->dma_type = CMD_DMA_NONE; command->cmd_dma = 0; } if (command->sge_buffer) { pci_unmap_sg(host->pdev, command->sge_buffer, command->dma_size, command->dma_dir); SBP2_DMA_FREE("scatter list"); command->sge_buffer = NULL; } } /* * This function moves a command to the completed orb list. * Must be called with scsi_id->sbp2_command_orb_lock held. */ static void sbp2util_mark_command_completed( struct scsi_id_instance_data *scsi_id, struct sbp2_command_info *command) { list_del(&command->list); sbp2util_free_command_dma(command); list_add_tail(&command->list, &scsi_id->sbp2_command_orb_completed); } /* * Is scsi_id valid? Is the 1394 node still present? */ static inline int sbp2util_node_is_available(struct scsi_id_instance_data *scsi_id) { return scsi_id && scsi_id->ne && !scsi_id->ne->in_limbo; } /********************************************* * IEEE-1394 core driver stack related section *********************************************/ static struct scsi_id_instance_data *sbp2_alloc_device(struct unit_directory *ud); static int sbp2_probe(struct device *dev) { struct unit_directory *ud; struct scsi_id_instance_data *scsi_id; SBP2_DEBUG_ENTER(); ud = container_of(dev, struct unit_directory, device); /* Don't probe UD's that have the LUN flag. We'll probe the LUN(s) * instead. */ if (ud->flags & UNIT_DIRECTORY_HAS_LUN_DIRECTORY) return -ENODEV; scsi_id = sbp2_alloc_device(ud); if (!scsi_id) return -ENOMEM; sbp2_parse_unit_directory(scsi_id, ud); return sbp2_start_device(scsi_id); } static int sbp2_remove(struct device *dev) { struct unit_directory *ud; struct scsi_id_instance_data *scsi_id; struct scsi_device *sdev; SBP2_DEBUG_ENTER(); ud = container_of(dev, struct unit_directory, device); scsi_id = ud->device.driver_data; if (!scsi_id) return 0; if (scsi_id->scsi_host) { /* Get rid of enqueued commands if there is no chance to * send them. */ if (!sbp2util_node_is_available(scsi_id)) sbp2scsi_complete_all_commands(scsi_id, DID_NO_CONNECT); /* scsi_remove_device() will trigger shutdown functions of SCSI * highlevel drivers which would deadlock if blocked. */ atomic_set(&scsi_id->state, SBP2LU_STATE_IN_SHUTDOWN); scsi_unblock_requests(scsi_id->scsi_host); } sdev = scsi_id->sdev; if (sdev) { scsi_id->sdev = NULL; scsi_remove_device(sdev); } sbp2_logout_device(scsi_id); sbp2_remove_device(scsi_id); return 0; } static int sbp2_update(struct unit_directory *ud) { struct scsi_id_instance_data *scsi_id = ud->device.driver_data; SBP2_DEBUG_ENTER(); if (sbp2_reconnect_device(scsi_id)) { /* * Ok, reconnect has failed. Perhaps we didn't * reconnect fast enough. Try doing a regular login, but * first do a logout just in case of any weirdness. */ sbp2_logout_device(scsi_id); if (sbp2_login_device(scsi_id)) { /* Login failed too, just fail, and the backend * will call our sbp2_remove for us */ SBP2_ERR("Failed to reconnect to sbp2 device!"); return -EBUSY; } } /* Set max retries to something large on the device. */ sbp2_set_busy_timeout(scsi_id); /* Do a SBP-2 fetch agent reset. */ sbp2_agent_reset(scsi_id, 1); /* Get the max speed and packet size that we can use. */ sbp2_max_speed_and_size(scsi_id); /* Complete any pending commands with busy (so they get * retried) and remove them from our queue */ sbp2scsi_complete_all_commands(scsi_id, DID_BUS_BUSY); /* Accept new commands unless there was another bus reset in the * meantime. */ if (hpsb_node_entry_valid(scsi_id->ne)) { atomic_set(&scsi_id->state, SBP2LU_STATE_RUNNING); scsi_unblock_requests(scsi_id->scsi_host); } return 0; } /* This functions is called by the sbp2_probe, for each new device. We now * allocate one scsi host for each scsi_id (unit directory). */ static struct scsi_id_instance_data *sbp2_alloc_device(struct unit_directory *ud) { struct sbp2scsi_host_info *hi; struct Scsi_Host *scsi_host = NULL; struct scsi_id_instance_data *scsi_id = NULL; SBP2_DEBUG_ENTER(); scsi_id = kzalloc(sizeof(*scsi_id), GFP_KERNEL); if (!scsi_id) { SBP2_ERR("failed to create scsi_id"); goto failed_alloc; } scsi_id->ne = ud->ne; scsi_id->ud = ud; scsi_id->speed_code = IEEE1394_SPEED_100; scsi_id->max_payload_size = sbp2_speedto_max_payload[IEEE1394_SPEED_100]; scsi_id->status_fifo_addr = CSR1212_INVALID_ADDR_SPACE; INIT_LIST_HEAD(&scsi_id->sbp2_command_orb_inuse); INIT_LIST_HEAD(&scsi_id->sbp2_command_orb_completed); INIT_LIST_HEAD(&scsi_id->scsi_list); spin_lock_init(&scsi_id->sbp2_command_orb_lock); atomic_set(&scsi_id->state, SBP2LU_STATE_RUNNING); INIT_DELAYED_WORK(&scsi_id->protocol_work, NULL); ud->device.driver_data = scsi_id; hi = hpsb_get_hostinfo(&sbp2_highlevel, ud->ne->host); if (!hi) { hi = hpsb_create_hostinfo(&sbp2_highlevel, ud->ne->host, sizeof(*hi)); if (!hi) { SBP2_ERR("failed to allocate hostinfo"); goto failed_alloc; } SBP2_DEBUG("sbp2_alloc_device: allocated hostinfo"); hi->host = ud->ne->host; INIT_LIST_HEAD(&hi->scsi_ids); #ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA /* Handle data movement if physical dma is not * enabled or not supported on host controller */ if (!hpsb_register_addrspace(&sbp2_highlevel, ud->ne->host, &sbp2_physdma_ops, 0x0ULL, 0xfffffffcULL)) { SBP2_ERR("failed to register lower 4GB address range"); goto failed_alloc; } #endif } /* Prevent unloading of the 1394 host */ if (!try_module_get(hi->host->driver->owner)) { SBP2_ERR("failed to get a reference on 1394 host driver"); goto failed_alloc; } scsi_id->hi = hi; list_add_tail(&scsi_id->scsi_list, &hi->scsi_ids); /* Register the status FIFO address range. We could use the same FIFO * for targets at different nodes. However we need different FIFOs per * target in order to support multi-unit devices. * The FIFO is located out of the local host controller's physical range * but, if possible, within the posted write area. Status writes will * then be performed as unified transactions. This slightly reduces * bandwidth usage, and some Prolific based devices seem to require it. */ scsi_id->status_fifo_addr = hpsb_allocate_and_register_addrspace( &sbp2_highlevel, ud->ne->host, &sbp2_ops, sizeof(struct sbp2_status_block), sizeof(quadlet_t), ud->ne->host->low_addr_space, CSR1212_ALL_SPACE_END); if (scsi_id->status_fifo_addr == CSR1212_INVALID_ADDR_SPACE) { SBP2_ERR("failed to allocate status FIFO address range"); goto failed_alloc; } /* Register our host with the SCSI stack. */ scsi_host = scsi_host_alloc(&scsi_driver_template, sizeof(unsigned long)); if (!scsi_host) { SBP2_ERR("failed to register scsi host"); goto failed_alloc; } scsi_host->hostdata[0] = (unsigned long)scsi_id; if (!scsi_add_host(scsi_host, &ud->device)) { scsi_id->scsi_host = scsi_host; return scsi_id; } SBP2_ERR("failed to add scsi host"); scsi_host_put(scsi_host); failed_alloc: sbp2_remove_device(scsi_id); return NULL; } static void sbp2_host_reset(struct hpsb_host *host) { struct sbp2scsi_host_info *hi; struct scsi_id_instance_data *scsi_id; hi = hpsb_get_hostinfo(&sbp2_highlevel, host); if (!hi) return; list_for_each_entry(scsi_id, &hi->scsi_ids, scsi_list) if (likely(atomic_read(&scsi_id->state) != SBP2LU_STATE_IN_SHUTDOWN)) { atomic_set(&scsi_id->state, SBP2LU_STATE_IN_RESET); scsi_block_requests(scsi_id->scsi_host); } } /* * This function is where we first pull the node unique ids, and then * allocate memory and register a SBP-2 device. */ static int sbp2_start_device(struct scsi_id_instance_data *scsi_id) { struct sbp2scsi_host_info *hi = scsi_id->hi; int error; SBP2_DEBUG_ENTER(); /* Login FIFO DMA */ scsi_id->login_response = pci_alloc_consistent(hi->host->pdev, sizeof(struct sbp2_login_response), &scsi_id->login_response_dma); if (!scsi_id->login_response) goto alloc_fail; SBP2_DMA_ALLOC("consistent DMA region for login FIFO"); /* Query logins ORB DMA */ scsi_id->query_logins_orb = pci_alloc_consistent(hi->host->pdev, sizeof(struct sbp2_query_logins_orb), &scsi_id->query_logins_orb_dma); if (!scsi_id->query_logins_orb) goto alloc_fail; SBP2_DMA_ALLOC("consistent DMA region for query logins ORB"); /* Query logins response DMA */ scsi_id->query_logins_response = pci_alloc_consistent(hi->host->pdev, sizeof(struct sbp2_query_logins_response), &scsi_id->query_logins_response_dma); if (!scsi_id->query_logins_response) goto alloc_fail; SBP2_DMA_ALLOC("consistent DMA region for query logins response"); /* Reconnect ORB DMA */ scsi_id->reconnect_orb = pci_alloc_consistent(hi->host->pdev, sizeof(struct sbp2_reconnect_orb), &scsi_id->reconnect_orb_dma); if (!scsi_id->reconnect_orb) goto alloc_fail; SBP2_DMA_ALLOC("consistent DMA region for reconnect ORB"); /* Logout ORB DMA */ scsi_id->logout_orb = pci_alloc_consistent(hi->host->pdev, sizeof(struct sbp2_logout_orb), &scsi_id->logout_orb_dma); if (!scsi_id->logout_orb) goto alloc_fail; SBP2_DMA_ALLOC("consistent DMA region for logout ORB"); /* Login ORB DMA */ scsi_id->login_orb = pci_alloc_consistent(hi->host->pdev, sizeof(struct sbp2_login_orb), &scsi_id->login_orb_dma); if (!scsi_id->login_orb) goto alloc_fail; SBP2_DMA_ALLOC("consistent DMA region for login ORB"); SBP2_DEBUG("New SBP-2 device inserted, SCSI ID = %x", scsi_id->ud->id); /* * Create our command orb pool */ if (sbp2util_create_command_orb_pool(scsi_id)) { SBP2_ERR("sbp2util_create_command_orb_pool failed!"); sbp2_remove_device(scsi_id); return -ENOMEM; } /* Schedule a timeout here. The reason is that we may be so close * to a bus reset, that the device is not available for logins. * This can happen when the bus reset is caused by the host * connected to the sbp2 device being removed. That host would * have a certain amount of time to relogin before the sbp2 device * allows someone else to login instead. One second makes sense. */ if (msleep_interruptible(1000)) { sbp2_remove_device(scsi_id); return -EINTR; } /* * Login to the sbp-2 device */ if (sbp2_login_device(scsi_id)) { /* Login failed, just remove the device. */ sbp2_remove_device(scsi_id); return -EBUSY; } /* * Set max retries to something large on the device */ sbp2_set_busy_timeout(scsi_id); /* * Do a SBP-2 fetch agent reset */ sbp2_agent_reset(scsi_id, 1); /* * Get the max speed and packet size that we can use */ sbp2_max_speed_and_size(scsi_id); /* Add this device to the scsi layer now */ error = scsi_add_device(scsi_id->scsi_host, 0, scsi_id->ud->id, 0); if (error) { SBP2_ERR("scsi_add_device failed"); sbp2_logout_device(scsi_id); sbp2_remove_device(scsi_id); return error; } return 0; alloc_fail: SBP2_ERR("Could not allocate memory for scsi_id"); sbp2_remove_device(scsi_id); return -ENOMEM; } /* * This function removes an sbp2 device from the sbp2scsi_host_info struct. */ static void sbp2_remove_device(struct scsi_id_instance_data *scsi_id) { struct sbp2scsi_host_info *hi; SBP2_DEBUG_ENTER(); if (!scsi_id) return; hi = scsi_id->hi; /* This will remove our scsi device aswell */ if (scsi_id->scsi_host) { scsi_remove_host(scsi_id->scsi_host); scsi_host_put(scsi_id->scsi_host); } flush_scheduled_work(); sbp2util_remove_command_orb_pool(scsi_id); list_del(&scsi_id->scsi_list); if (scsi_id->login_response) { pci_free_consistent(hi->host->pdev, sizeof(struct sbp2_login_response), scsi_id->login_response, scsi_id->login_response_dma); SBP2_DMA_FREE("single login FIFO"); } if (scsi_id->login_orb) { pci_free_consistent(hi->host->pdev, sizeof(struct sbp2_login_orb), scsi_id->login_orb, scsi_id->login_orb_dma); SBP2_DMA_FREE("single login ORB"); } if (scsi_id->reconnect_orb) { pci_free_consistent(hi->host->pdev, sizeof(struct sbp2_reconnect_orb), scsi_id->reconnect_orb, scsi_id->reconnect_orb_dma); SBP2_DMA_FREE("single reconnect orb"); } if (scsi_id->logout_orb) { pci_free_consistent(hi->host->pdev, sizeof(struct sbp2_logout_orb), scsi_id->logout_orb, scsi_id->logout_orb_dma); SBP2_DMA_FREE("single logout orb"); } if (scsi_id->query_logins_orb) { pci_free_consistent(hi->host->pdev, sizeof(struct sbp2_query_logins_orb), scsi_id->query_logins_orb, scsi_id->query_logins_orb_dma); SBP2_DMA_FREE("single query logins orb"); } if (scsi_id->query_logins_response) { pci_free_consistent(hi->host->pdev, sizeof(struct sbp2_query_logins_response), scsi_id->query_logins_response, scsi_id->query_logins_response_dma); SBP2_DMA_FREE("single query logins data"); } if (scsi_id->status_fifo_addr != CSR1212_INVALID_ADDR_SPACE) hpsb_unregister_addrspace(&sbp2_highlevel, hi->host, scsi_id->status_fifo_addr); scsi_id->ud->device.driver_data = NULL; if (hi) module_put(hi->host->driver->owner); SBP2_DEBUG("SBP-2 device removed, SCSI ID = %d", scsi_id->ud->id); kfree(scsi_id); } #ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA /* * This function deals with physical dma write requests (for adapters that do not support * physical dma in hardware). Mostly just here for debugging... */ static int sbp2_handle_physdma_write(struct hpsb_host *host, int nodeid, int destid, quadlet_t *data, u64 addr, size_t length, u16 flags) { /* * Manually put the data in the right place. */ memcpy(bus_to_virt((u32) addr), data, length); sbp2util_packet_dump(data, length, "sbp2 phys dma write by device", (u32) addr); return RCODE_COMPLETE; } /* * This function deals with physical dma read requests (for adapters that do not support * physical dma in hardware). Mostly just here for debugging... */ static int sbp2_handle_physdma_read(struct hpsb_host *host, int nodeid, quadlet_t *data, u64 addr, size_t length, u16 flags) { /* * Grab data from memory and send a read response. */ memcpy(data, bus_to_virt((u32) addr), length); sbp2util_packet_dump(data, length, "sbp2 phys dma read by device", (u32) addr); return RCODE_COMPLETE; } #endif /************************************** * SBP-2 protocol related section **************************************/ /* * This function queries the device for the maximum concurrent logins it * supports. */ static int sbp2_query_logins(struct scsi_id_instance_data *scsi_id) { struct sbp2scsi_host_info *hi = scsi_id->hi; quadlet_t data[2]; int max_logins; int active_logins; SBP2_DEBUG_ENTER(); scsi_id->query_logins_orb->reserved1 = 0x0; scsi_id->query_logins_orb->reserved2 = 0x0; scsi_id->query_logins_orb->query_response_lo = scsi_id->query_logins_response_dma; scsi_id->query_logins_orb->query_response_hi = ORB_SET_NODE_ID(hi->host->node_id); scsi_id->query_logins_orb->lun_misc = ORB_SET_FUNCTION(SBP2_QUERY_LOGINS_REQUEST); scsi_id->query_logins_orb->lun_misc |= ORB_SET_NOTIFY(1); scsi_id->query_logins_orb->lun_misc |= ORB_SET_LUN(scsi_id->sbp2_lun); scsi_id->query_logins_orb->reserved_resp_length = ORB_SET_QUERY_LOGINS_RESP_LENGTH(sizeof(struct sbp2_query_logins_response)); scsi_id->query_logins_orb->status_fifo_hi = ORB_SET_STATUS_FIFO_HI(scsi_id->status_fifo_addr, hi->host->node_id); scsi_id->query_logins_orb->status_fifo_lo = ORB_SET_STATUS_FIFO_LO(scsi_id->status_fifo_addr); sbp2util_cpu_to_be32_buffer(scsi_id->query_logins_orb, sizeof(struct sbp2_query_logins_orb)); sbp2util_packet_dump(scsi_id->query_logins_orb, sizeof(struct sbp2_query_logins_orb), "sbp2 query logins orb", scsi_id->query_logins_orb_dma); memset(scsi_id->query_logins_response, 0, sizeof(struct sbp2_query_logins_response)); data[0] = ORB_SET_NODE_ID(hi->host->node_id); data[1] = scsi_id->query_logins_orb_dma; sbp2util_cpu_to_be32_buffer(data, 8); hpsb_node_write(scsi_id->ne, scsi_id->sbp2_management_agent_addr, data, 8); if (sbp2util_access_timeout(scsi_id, 2*HZ)) { SBP2_INFO("Error querying logins to SBP-2 device - timed out"); return -EIO; } if (scsi_id->status_block.ORB_offset_lo != scsi_id->query_logins_orb_dma) { SBP2_INFO("Error querying logins to SBP-2 device - timed out"); return -EIO; } if (STATUS_TEST_RDS(scsi_id->status_block.ORB_offset_hi_misc)) { SBP2_INFO("Error querying logins to SBP-2 device - failed"); return -EIO; } sbp2util_cpu_to_be32_buffer(scsi_id->query_logins_response, sizeof(struct sbp2_query_logins_response)); SBP2_DEBUG("length_max_logins = %x", (unsigned int)scsi_id->query_logins_response->length_max_logins); max_logins = RESPONSE_GET_MAX_LOGINS(scsi_id->query_logins_response->length_max_logins); SBP2_INFO("Maximum concurrent logins supported: %d", max_logins); active_logins = RESPONSE_GET_ACTIVE_LOGINS(scsi_id->query_logins_response->length_max_logins); SBP2_INFO("Number of active logins: %d", active_logins); if (active_logins >= max_logins) { return -EIO; } return 0; } /* * This function is called in order to login to a particular SBP-2 device, * after a bus reset. */ static int sbp2_login_device(struct scsi_id_instance_data *scsi_id) { struct sbp2scsi_host_info *hi = scsi_id->hi; quadlet_t data[2]; SBP2_DEBUG_ENTER(); if (!scsi_id->login_orb) { SBP2_DEBUG("%s: login_orb not alloc'd!", __FUNCTION__); return -EIO; } if (!exclusive_login) { if (sbp2_query_logins(scsi_id)) { SBP2_INFO("Device does not support any more concurrent logins"); return -EIO; } } /* Set-up login ORB, assume no password */ scsi_id->login_orb->password_hi = 0; scsi_id->login_orb->password_lo = 0; scsi_id->login_orb->login_response_lo = scsi_id->login_response_dma; scsi_id->login_orb->login_response_hi = ORB_SET_NODE_ID(hi->host->node_id); scsi_id->login_orb->lun_misc = ORB_SET_FUNCTION(SBP2_LOGIN_REQUEST); scsi_id->login_orb->lun_misc |= ORB_SET_RECONNECT(0); /* One second reconnect time */ scsi_id->login_orb->lun_misc |= ORB_SET_EXCLUSIVE(exclusive_login); /* Exclusive access to device */ scsi_id->login_orb->lun_misc |= ORB_SET_NOTIFY(1); /* Notify us of login complete */ scsi_id->login_orb->lun_misc |= ORB_SET_LUN(scsi_id->sbp2_lun); scsi_id->login_orb->passwd_resp_lengths = ORB_SET_LOGIN_RESP_LENGTH(sizeof(struct sbp2_login_response)); scsi_id->login_orb->status_fifo_hi = ORB_SET_STATUS_FIFO_HI(scsi_id->status_fifo_addr, hi->host->node_id); scsi_id->login_orb->status_fifo_lo = ORB_SET_STATUS_FIFO_LO(scsi_id->status_fifo_addr); sbp2util_cpu_to_be32_buffer(scsi_id->login_orb, sizeof(struct sbp2_login_orb)); sbp2util_packet_dump(scsi_id->login_orb, sizeof(struct sbp2_login_orb), "sbp2 login orb", scsi_id->login_orb_dma); memset(scsi_id->login_response, 0, sizeof(struct sbp2_login_response)); data[0] = ORB_SET_NODE_ID(hi->host->node_id); data[1] = scsi_id->login_orb_dma; sbp2util_cpu_to_be32_buffer(data, 8); hpsb_node_write(scsi_id->ne, scsi_id->sbp2_management_agent_addr, data, 8); /* * Wait for login status (up to 20 seconds)... */ if (sbp2util_access_timeout(scsi_id, 20*HZ)) { SBP2_ERR("Error logging into SBP-2 device - timed out"); return -EIO; } /* * Sanity. Make sure status returned matches login orb. */ if (scsi_id->status_block.ORB_offset_lo != scsi_id->login_orb_dma) { SBP2_ERR("Error logging into SBP-2 device - timed out"); return -EIO; } if (STATUS_TEST_RDS(scsi_id->status_block.ORB_offset_hi_misc)) { SBP2_ERR("Error logging into SBP-2 device - failed"); return -EIO; } /* * Byte swap the login response, for use when reconnecting or * logging out. */ sbp2util_cpu_to_be32_buffer(scsi_id->login_response, sizeof(struct sbp2_login_response)); /* * Grab our command block agent address from the login response. */ SBP2_DEBUG("command_block_agent_hi = %x", (unsigned int)scsi_id->login_response->command_block_agent_hi); SBP2_DEBUG("command_block_agent_lo = %x", (unsigned int)scsi_id->login_response->command_block_agent_lo); scsi_id->sbp2_command_block_agent_addr = ((u64)scsi_id->login_response->command_block_agent_hi) << 32; scsi_id->sbp2_command_block_agent_addr |= ((u64)scsi_id->login_response->command_block_agent_lo); scsi_id->sbp2_command_block_agent_addr &= 0x0000ffffffffffffULL; SBP2_INFO("Logged into SBP-2 device"); return 0; } /* * This function is called in order to logout from a particular SBP-2 * device, usually called during driver unload. */ static int sbp2_logout_device(struct scsi_id_instance_data *scsi_id) { struct sbp2scsi_host_info *hi = scsi_id->hi; quadlet_t data[2]; int error; SBP2_DEBUG_ENTER(); /* * Set-up logout ORB */ scsi_id->logout_orb->reserved1 = 0x0; scsi_id->logout_orb->reserved2 = 0x0; scsi_id->logout_orb->reserved3 = 0x0; scsi_id->logout_orb->reserved4 = 0x0; scsi_id->logout_orb->login_ID_misc = ORB_SET_FUNCTION(SBP2_LOGOUT_REQUEST); scsi_id->logout_orb->login_ID_misc |= ORB_SET_LOGIN_ID(scsi_id->login_response->length_login_ID); /* Notify us when complete */ scsi_id->logout_orb->login_ID_misc |= ORB_SET_NOTIFY(1); scsi_id->logout_orb->reserved5 = 0x0; scsi_id->logout_orb->status_fifo_hi = ORB_SET_STATUS_FIFO_HI(scsi_id->status_fifo_addr, hi->host->node_id); scsi_id->logout_orb->status_fifo_lo = ORB_SET_STATUS_FIFO_LO(scsi_id->status_fifo_addr); /* * Byte swap ORB if necessary */ sbp2util_cpu_to_be32_buffer(scsi_id->logout_orb, sizeof(struct sbp2_logout_orb)); sbp2util_packet_dump(scsi_id->logout_orb, sizeof(struct sbp2_logout_orb), "sbp2 logout orb", scsi_id->logout_orb_dma); /* * Ok, let's write to the target's management agent register */ data[0] = ORB_SET_NODE_ID(hi->host->node_id); data[1] = scsi_id->logout_orb_dma; sbp2util_cpu_to_be32_buffer(data, 8); error = hpsb_node_write(scsi_id->ne, scsi_id->sbp2_management_agent_addr, data, 8); if (error) return error; /* Wait for device to logout...1 second. */ if (sbp2util_access_timeout(scsi_id, HZ)) return -EIO; SBP2_INFO("Logged out of SBP-2 device"); return 0; } /* * This function is called in order to reconnect to a particular SBP-2 * device, after a bus reset. */ static int sbp2_reconnect_device(struct scsi_id_instance_data *scsi_id) { struct sbp2scsi_host_info *hi = scsi_id->hi; quadlet_t data[2]; int error; SBP2_DEBUG_ENTER(); /* * Set-up reconnect ORB */ scsi_id->reconnect_orb->reserved1 = 0x0; scsi_id->reconnect_orb->reserved2 = 0x0; scsi_id->reconnect_orb->reserved3 = 0x0; scsi_id->reconnect_orb->reserved4 = 0x0; scsi_id->reconnect_orb->login_ID_misc = ORB_SET_FUNCTION(SBP2_RECONNECT_REQUEST); scsi_id->reconnect_orb->login_ID_misc |= ORB_SET_LOGIN_ID(scsi_id->login_response->length_login_ID); /* Notify us when complete */ scsi_id->reconnect_orb->login_ID_misc |= ORB_SET_NOTIFY(1); scsi_id->reconnect_orb->reserved5 = 0x0; scsi_id->reconnect_orb->status_fifo_hi = ORB_SET_STATUS_FIFO_HI(scsi_id->status_fifo_addr, hi->host->node_id); scsi_id->reconnect_orb->status_fifo_lo = ORB_SET_STATUS_FIFO_LO(scsi_id->status_fifo_addr); /* * Byte swap ORB if necessary */ sbp2util_cpu_to_be32_buffer(scsi_id->reconnect_orb, sizeof(struct sbp2_reconnect_orb)); sbp2util_packet_dump(scsi_id->reconnect_orb, sizeof(struct sbp2_reconnect_orb), "sbp2 reconnect orb", scsi_id->reconnect_orb_dma); data[0] = ORB_SET_NODE_ID(hi->host->node_id); data[1] = scsi_id->reconnect_orb_dma; sbp2util_cpu_to_be32_buffer(data, 8); error = hpsb_node_write(scsi_id->ne, scsi_id->sbp2_management_agent_addr, data, 8); if (error) return error; /* * Wait for reconnect status (up to 1 second)... */ if (sbp2util_access_timeout(scsi_id, HZ)) { SBP2_ERR("Error reconnecting to SBP-2 device - timed out"); return -EIO; } /* * Sanity. Make sure status returned matches reconnect orb. */ if (scsi_id->status_block.ORB_offset_lo != scsi_id->reconnect_orb_dma) { SBP2_ERR("Error reconnecting to SBP-2 device - timed out"); return -EIO; } if (STATUS_TEST_RDS(scsi_id->status_block.ORB_offset_hi_misc)) { SBP2_ERR("Error reconnecting to SBP-2 device - failed"); return -EIO; } HPSB_DEBUG("Reconnected to SBP-2 device"); return 0; } /* * This function is called in order to set the busy timeout (number of * retries to attempt) on the sbp2 device. */ static int sbp2_set_busy_timeout(struct scsi_id_instance_data *scsi_id) { quadlet_t data; SBP2_DEBUG_ENTER(); data = cpu_to_be32(SBP2_BUSY_TIMEOUT_VALUE); if (hpsb_node_write(scsi_id->ne, SBP2_BUSY_TIMEOUT_ADDRESS, &data, 4)) SBP2_ERR("%s error", __FUNCTION__); return 0; } /* * This function is called to parse sbp2 device's config rom unit * directory. Used to determine things like sbp2 management agent offset, * and command set used (SCSI or RBC). */ static void sbp2_parse_unit_directory(struct scsi_id_instance_data *scsi_id, struct unit_directory *ud) { struct csr1212_keyval *kv; struct csr1212_dentry *dentry; u64 management_agent_addr; u32 command_set_spec_id, command_set, unit_characteristics, firmware_revision; unsigned workarounds; int i; SBP2_DEBUG_ENTER(); management_agent_addr = 0x0; command_set_spec_id = 0x0; command_set = 0x0; unit_characteristics = 0x0; firmware_revision = 0x0; /* Handle different fields in the unit directory, based on keys */ csr1212_for_each_dir_entry(ud->ne->csr, kv, ud->ud_kv, dentry) { switch (kv->key.id) { case CSR1212_KV_ID_DEPENDENT_INFO: if (kv->key.type == CSR1212_KV_TYPE_CSR_OFFSET) { /* Save off the management agent address */ management_agent_addr = CSR1212_REGISTER_SPACE_BASE + (kv->value.csr_offset << 2); SBP2_DEBUG("sbp2_management_agent_addr = %x", (unsigned int)management_agent_addr); } else if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) { scsi_id->sbp2_lun = ORB_SET_LUN(kv->value.immediate); } break; case SBP2_COMMAND_SET_SPEC_ID_KEY: /* Command spec organization */ command_set_spec_id = kv->value.immediate; SBP2_DEBUG("sbp2_command_set_spec_id = %x", (unsigned int)command_set_spec_id); break; case SBP2_COMMAND_SET_KEY: /* Command set used by sbp2 device */ command_set = kv->value.immediate; SBP2_DEBUG("sbp2_command_set = %x", (unsigned int)command_set); break; case SBP2_UNIT_CHARACTERISTICS_KEY: /* * Unit characterisitcs (orb related stuff * that I'm not yet paying attention to) */ unit_characteristics = kv->value.immediate; SBP2_DEBUG("sbp2_unit_characteristics = %x", (unsigned int)unit_characteristics); break; case SBP2_FIRMWARE_REVISION_KEY: /* Firmware revision */ firmware_revision = kv->value.immediate; SBP2_DEBUG("sbp2_firmware_revision = %x", (unsigned int)firmware_revision); break; default: break; } } workarounds = sbp2_default_workarounds; if (!(workarounds & SBP2_WORKAROUND_OVERRIDE)) for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) { if (sbp2_workarounds_table[i].firmware_revision && sbp2_workarounds_table[i].firmware_revision != (firmware_revision & 0xffff00)) continue; if (sbp2_workarounds_table[i].model_id && sbp2_workarounds_table[i].model_id != ud->model_id) continue; workarounds |= sbp2_workarounds_table[i].workarounds; break; } if (workarounds) SBP2_INFO("Workarounds for node " NODE_BUS_FMT ": 0x%x " "(firmware_revision 0x%06x, vendor_id 0x%06x," " model_id 0x%06x)", NODE_BUS_ARGS(ud->ne->host, ud->ne->nodeid), workarounds, firmware_revision, ud->vendor_id ? ud->vendor_id : ud->ne->vendor_id, ud->model_id); /* We would need one SCSI host template for each target to adjust * max_sectors on the fly, therefore warn only. */ if (workarounds & SBP2_WORKAROUND_128K_MAX_TRANS && (max_sectors * 512) > (128 * 1024)) SBP2_WARN("Node " NODE_BUS_FMT ": Bridge only supports 128KB " "max transfer size. WARNING: Current max_sectors " "setting is larger than 128KB (%d sectors)", NODE_BUS_ARGS(ud->ne->host, ud->ne->nodeid), max_sectors); /* If this is a logical unit directory entry, process the parent * to get the values. */ if (ud->flags & UNIT_DIRECTORY_LUN_DIRECTORY) { struct unit_directory *parent_ud = container_of(ud->device.parent, struct unit_directory, device); sbp2_parse_unit_directory(scsi_id, parent_ud); } else { scsi_id->sbp2_management_agent_addr = management_agent_addr; scsi_id->sbp2_command_set_spec_id = command_set_spec_id; scsi_id->sbp2_command_set = command_set; scsi_id->sbp2_unit_characteristics = unit_characteristics; scsi_id->sbp2_firmware_revision = firmware_revision; scsi_id->workarounds = workarounds; if (ud->flags & UNIT_DIRECTORY_HAS_LUN) scsi_id->sbp2_lun = ORB_SET_LUN(ud->lun); } } #define SBP2_PAYLOAD_TO_BYTES(p) (1 << ((p) + 2)) /* * This function is called in order to determine the max speed and packet * size we can use in our ORBs. Note, that we (the driver and host) only * initiate the transaction. The SBP-2 device actually transfers the data * (by reading from the DMA area we tell it). This means that the SBP-2 * device decides the actual maximum data it can transfer. We just tell it * the speed that it needs to use, and the max_rec the host supports, and * it takes care of the rest. */ static int sbp2_max_speed_and_size(struct scsi_id_instance_data *scsi_id) { struct sbp2scsi_host_info *hi = scsi_id->hi; u8 payload; SBP2_DEBUG_ENTER(); scsi_id->speed_code = hi->host->speed[NODEID_TO_NODE(scsi_id->ne->nodeid)]; /* Bump down our speed if the user requested it */ if (scsi_id->speed_code > max_speed) { scsi_id->speed_code = max_speed; SBP2_ERR("Forcing SBP-2 max speed down to %s", hpsb_speedto_str[scsi_id->speed_code]); } /* Payload size is the lesser of what our speed supports and what * our host supports. */ payload = min(sbp2_speedto_max_payload[scsi_id->speed_code], (u8) (hi->host->csr.max_rec - 1)); /* If physical DMA is off, work around limitation in ohci1394: * packet size must not exceed PAGE_SIZE */ if (scsi_id->ne->host->low_addr_space < (1ULL << 32)) while (SBP2_PAYLOAD_TO_BYTES(payload) + 24 > PAGE_SIZE && payload) payload--; HPSB_DEBUG("Node " NODE_BUS_FMT ": Max speed [%s] - Max payload [%u]", NODE_BUS_ARGS(hi->host, scsi_id->ne->nodeid), hpsb_speedto_str[scsi_id->speed_code], SBP2_PAYLOAD_TO_BYTES(payload)); scsi_id->max_payload_size = payload; return 0; } /* * This function is called in order to perform a SBP-2 agent reset. */ static int sbp2_agent_reset(struct scsi_id_instance_data *scsi_id, int wait) { quadlet_t data; u64 addr; int retval; unsigned long flags; SBP2_DEBUG_ENTER(); cancel_delayed_work(&scsi_id->protocol_work); if (wait) flush_scheduled_work(); data = ntohl(SBP2_AGENT_RESET_DATA); addr = scsi_id->sbp2_command_block_agent_addr + SBP2_AGENT_RESET_OFFSET; if (wait) retval = hpsb_node_write(scsi_id->ne, addr, &data, 4); else retval = sbp2util_node_write_no_wait(scsi_id->ne, addr, &data, 4); if (retval < 0) { SBP2_ERR("hpsb_node_write failed.\n"); return -EIO; } /* * Need to make sure orb pointer is written on next command */ spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags); scsi_id->last_orb = NULL; spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags); return 0; } static void sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb, struct sbp2scsi_host_info *hi, struct sbp2_command_info *command, unsigned int scsi_use_sg, struct scatterlist *sgpnt, u32 orb_direction, enum dma_data_direction dma_dir) { command->dma_dir = dma_dir; orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id); orb->misc |= ORB_SET_DIRECTION(orb_direction); /* Special case if only one element (and less than 64KB in size) */ if ((scsi_use_sg == 1) && (sgpnt[0].length <= SBP2_MAX_SG_ELEMENT_LENGTH)) { SBP2_DEBUG("Only one s/g element"); command->dma_size = sgpnt[0].length; command->dma_type = CMD_DMA_PAGE; command->cmd_dma = pci_map_page(hi->host->pdev, sgpnt[0].page, sgpnt[0].offset, command->dma_size, command->dma_dir); SBP2_DMA_ALLOC("single page scatter element"); orb->data_descriptor_lo = command->cmd_dma; orb->misc |= ORB_SET_DATA_SIZE(command->dma_size); } else { struct sbp2_unrestricted_page_table *sg_element = &command->scatter_gather_element[0]; u32 sg_count, sg_len; dma_addr_t sg_addr; int i, count = pci_map_sg(hi->host->pdev, sgpnt, scsi_use_sg, dma_dir); SBP2_DMA_ALLOC("scatter list"); command->dma_size = scsi_use_sg; command->sge_buffer = sgpnt; /* use page tables (s/g) */ orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1); orb->data_descriptor_lo = command->sge_dma; /* * Loop through and fill out our sbp-2 page tables * (and split up anything too large) */ for (i = 0, sg_count = 0 ; i < count; i++, sgpnt++) { sg_len = sg_dma_len(sgpnt); sg_addr = sg_dma_address(sgpnt); while (sg_len) { sg_element[sg_count].segment_base_lo = sg_addr; if (sg_len > SBP2_MAX_SG_ELEMENT_LENGTH) { sg_element[sg_count].length_segment_base_hi = PAGE_TABLE_SET_SEGMENT_LENGTH(SBP2_MAX_SG_ELEMENT_LENGTH); sg_addr += SBP2_MAX_SG_ELEMENT_LENGTH; sg_len -= SBP2_MAX_SG_ELEMENT_LENGTH; } else { sg_element[sg_count].length_segment_base_hi = PAGE_TABLE_SET_SEGMENT_LENGTH(sg_len); sg_len = 0; } sg_count++; } } /* Number of page table (s/g) elements */ orb->misc |= ORB_SET_DATA_SIZE(sg_count); sbp2util_packet_dump(sg_element, (sizeof(struct sbp2_unrestricted_page_table)) * sg_count, "sbp2 s/g list", command->sge_dma); /* Byte swap page tables if necessary */ sbp2util_cpu_to_be32_buffer(sg_element, (sizeof(struct sbp2_unrestricted_page_table)) * sg_count); } } static void sbp2_prep_command_orb_no_sg(struct sbp2_command_orb *orb, struct sbp2scsi_host_info *hi, struct sbp2_command_info *command, struct scatterlist *sgpnt, u32 orb_direction, unsigned int scsi_request_bufflen, void *scsi_request_buffer, enum dma_data_direction dma_dir) { command->dma_dir = dma_dir; command->dma_size = scsi_request_bufflen; command->dma_type = CMD_DMA_SINGLE; command->cmd_dma = pci_map_single(hi->host->pdev, scsi_request_buffer, command->dma_size, command->dma_dir); orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id); orb->misc |= ORB_SET_DIRECTION(orb_direction); SBP2_DMA_ALLOC("single bulk"); /* * Handle case where we get a command w/o s/g enabled (but * check for transfers larger than 64K) */ if (scsi_request_bufflen <= SBP2_MAX_SG_ELEMENT_LENGTH) { orb->data_descriptor_lo = command->cmd_dma; orb->misc |= ORB_SET_DATA_SIZE(scsi_request_bufflen); } else { struct sbp2_unrestricted_page_table *sg_element = &command->scatter_gather_element[0]; u32 sg_count, sg_len; dma_addr_t sg_addr; /* * Need to turn this into page tables, since the * buffer is too large. */ orb->data_descriptor_lo = command->sge_dma; /* Use page tables (s/g) */ orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1); /* * fill out our sbp-2 page tables (and split up * the large buffer) */ sg_count = 0; sg_len = scsi_request_bufflen; sg_addr = command->cmd_dma; while (sg_len) { sg_element[sg_count].segment_base_lo = sg_addr; if (sg_len > SBP2_MAX_SG_ELEMENT_LENGTH) { sg_element[sg_count].length_segment_base_hi = PAGE_TABLE_SET_SEGMENT_LENGTH(SBP2_MAX_SG_ELEMENT_LENGTH); sg_addr += SBP2_MAX_SG_ELEMENT_LENGTH; sg_len -= SBP2_MAX_SG_ELEMENT_LENGTH; } else { sg_element[sg_count].length_segment_base_hi = PAGE_TABLE_SET_SEGMENT_LENGTH(sg_len); sg_len = 0; } sg_count++; } /* Number of page table (s/g) elements */ orb->misc |= ORB_SET_DATA_SIZE(sg_count); sbp2util_packet_dump(sg_element, (sizeof(struct sbp2_unrestricted_page_table)) * sg_count, "sbp2 s/g list", command->sge_dma); /* Byte swap page tables if necessary */ sbp2util_cpu_to_be32_buffer(sg_element, (sizeof(struct sbp2_unrestricted_page_table)) * sg_count); } } /* * This function is called to create the actual command orb and s/g list * out of the scsi command itself. */ static void sbp2_create_command_orb(struct scsi_id_instance_data *scsi_id, struct sbp2_command_info *command, unchar *scsi_cmd, unsigned int scsi_use_sg, unsigned int scsi_request_bufflen, void *scsi_request_buffer, enum dma_data_direction dma_dir) { struct sbp2scsi_host_info *hi = scsi_id->hi; struct scatterlist *sgpnt = (struct scatterlist *)scsi_request_buffer; struct sbp2_command_orb *command_orb = &command->command_orb; u32 orb_direction; /* * Set-up our command ORB.. * * NOTE: We're doing unrestricted page tables (s/g), as this is * best performance (at least with the devices I have). This means * that data_size becomes the number of s/g elements, and * page_size should be zero (for unrestricted). */ command_orb->next_ORB_hi = ORB_SET_NULL_PTR(1); command_orb->next_ORB_lo = 0x0; command_orb->misc = ORB_SET_MAX_PAYLOAD(scsi_id->max_payload_size); command_orb->misc |= ORB_SET_SPEED(scsi_id->speed_code); command_orb->misc |= ORB_SET_NOTIFY(1); /* Notify us when complete */ if (dma_dir == DMA_NONE) orb_direction = ORB_DIRECTION_NO_DATA_TRANSFER; else if (dma_dir == DMA_TO_DEVICE && scsi_request_bufflen) orb_direction = ORB_DIRECTION_WRITE_TO_MEDIA; else if (dma_dir == DMA_FROM_DEVICE && scsi_request_bufflen) orb_direction = ORB_DIRECTION_READ_FROM_MEDIA; else { SBP2_WARN("Falling back to DMA_NONE"); orb_direction = ORB_DIRECTION_NO_DATA_TRANSFER; } /* Set-up our pagetable stuff */ if (orb_direction == ORB_DIRECTION_NO_DATA_TRANSFER) { SBP2_DEBUG("No data transfer"); command_orb->data_descriptor_hi = 0x0; command_orb->data_descriptor_lo = 0x0; command_orb->misc |= ORB_SET_DIRECTION(1); } else if (scsi_use_sg) { SBP2_DEBUG("Use scatter/gather"); sbp2_prep_command_orb_sg(command_orb, hi, command, scsi_use_sg, sgpnt, orb_direction, dma_dir); } else { SBP2_DEBUG("No scatter/gather"); sbp2_prep_command_orb_no_sg(command_orb, hi, command, sgpnt, orb_direction, scsi_request_bufflen, scsi_request_buffer, dma_dir); } /* Byte swap command ORB if necessary */ sbp2util_cpu_to_be32_buffer(command_orb, sizeof(struct sbp2_command_orb)); /* Put our scsi command in the command ORB */ memset(command_orb->cdb, 0, 12); memcpy(command_orb->cdb, scsi_cmd, COMMAND_SIZE(*scsi_cmd)); } /* * This function is called in order to begin a regular SBP-2 command. */ static void sbp2_link_orb_command(struct scsi_id_instance_data *scsi_id, struct sbp2_command_info *command) { struct sbp2scsi_host_info *hi = scsi_id->hi; struct sbp2_command_orb *command_orb = &command->command_orb; struct sbp2_command_orb *last_orb; dma_addr_t last_orb_dma; u64 addr = scsi_id->sbp2_command_block_agent_addr; quadlet_t data[2]; size_t length; unsigned long flags; outstanding_orb_incr; SBP2_ORB_DEBUG("sending command orb %p, total orbs = %x", command_orb, global_outstanding_command_orbs); pci_dma_sync_single_for_device(hi->host->pdev, command->command_orb_dma, sizeof(struct sbp2_command_orb), PCI_DMA_TODEVICE); pci_dma_sync_single_for_device(hi->host->pdev, command->sge_dma, sizeof(command->scatter_gather_element), PCI_DMA_BIDIRECTIONAL); /* * Check to see if there are any previous orbs to use */ spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags); last_orb = scsi_id->last_orb; last_orb_dma = scsi_id->last_orb_dma; if (!last_orb) { /* * last_orb == NULL means: We know that the target's fetch agent * is not active right now. */ addr += SBP2_ORB_POINTER_OFFSET; data[0] = ORB_SET_NODE_ID(hi->host->node_id); data[1] = command->command_orb_dma; sbp2util_cpu_to_be32_buffer(data, 8); length = 8; } else { /* * last_orb != NULL means: We know that the target's fetch agent * is (very probably) not dead or in reset state right now. * We have an ORB already sent that we can append a new one to. * The target's fetch agent may or may not have read this * previous ORB yet. */ pci_dma_sync_single_for_cpu(hi->host->pdev, last_orb_dma, sizeof(struct sbp2_command_orb), PCI_DMA_TODEVICE); last_orb->next_ORB_lo = cpu_to_be32(command->command_orb_dma); wmb(); /* Tells hardware that this pointer is valid */ last_orb->next_ORB_hi = 0; pci_dma_sync_single_for_device(hi->host->pdev, last_orb_dma, sizeof(struct sbp2_command_orb), PCI_DMA_TODEVICE); addr += SBP2_DOORBELL_OFFSET; data[0] = 0; length = 4; } scsi_id->last_orb = command_orb; scsi_id->last_orb_dma = command->command_orb_dma; spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags); SBP2_ORB_DEBUG("write to %s register, command orb %p", last_orb ? "DOORBELL" : "ORB_POINTER", command_orb); if (sbp2util_node_write_no_wait(scsi_id->ne, addr, data, length)) { /* * sbp2util_node_write_no_wait failed. We certainly ran out * of transaction labels, perhaps just because there were no * context switches which gave khpsbpkt a chance to collect * free tlabels. Try again in non-atomic context. If necessary, * the workqueue job will sleep to guaranteedly get a tlabel. * We do not accept new commands until the job is over. */ scsi_block_requests(scsi_id->scsi_host); PREPARE_DELAYED_WORK(&scsi_id->protocol_work, last_orb ? sbp2util_write_doorbell: sbp2util_write_orb_pointer); schedule_delayed_work(&scsi_id->protocol_work, 0); } } /* * This function is called in order to begin a regular SBP-2 command. */ static int sbp2_send_command(struct scsi_id_instance_data *scsi_id, struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) { unchar *cmd = (unchar *) SCpnt->cmnd; unsigned int request_bufflen = SCpnt->request_bufflen; struct sbp2_command_info *command; SBP2_DEBUG_ENTER(); SBP2_DEBUG("SCSI transfer size = %x", request_bufflen); SBP2_DEBUG("SCSI s/g elements = %x", (unsigned int)SCpnt->use_sg); /* * Allocate a command orb and s/g structure */ command = sbp2util_allocate_command_orb(scsi_id, SCpnt, done); if (!command) { return -EIO; } /* * Now actually fill in the comamnd orb and sbp2 s/g list */ sbp2_create_command_orb(scsi_id, command, cmd, SCpnt->use_sg, request_bufflen, SCpnt->request_buffer, SCpnt->sc_data_direction); sbp2util_packet_dump(&command->command_orb, sizeof(struct sbp2_command_orb), "sbp2 command orb", command->command_orb_dma); /* * Link up the orb, and ring the doorbell if needed */ sbp2_link_orb_command(scsi_id, command); return 0; } /* * Translates SBP-2 status into SCSI sense data for check conditions */ static unsigned int sbp2_status_to_sense_data(unchar *sbp2_status, unchar *sense_data) { SBP2_DEBUG_ENTER(); /* * Ok, it's pretty ugly... ;-) */ sense_data[0] = 0x70; sense_data[1] = 0x0; sense_data[2] = sbp2_status[9]; sense_data[3] = sbp2_status[12]; sense_data[4] = sbp2_status[13]; sense_data[5] = sbp2_status[14]; sense_data[6] = sbp2_status[15]; sense_data[7] = 10; sense_data[8] = sbp2_status[16]; sense_data[9] = sbp2_status[17]; sense_data[10] = sbp2_status[18]; sense_data[11] = sbp2_status[19]; sense_data[12] = sbp2_status[10]; sense_data[13] = sbp2_status[11]; sense_data[14] = sbp2_status[20]; sense_data[15] = sbp2_status[21]; return sbp2_status[8] & 0x3f; /* return scsi status */ } /* * This function deals with status writes from the SBP-2 device */ static int sbp2_handle_status_write(struct hpsb_host *host, int nodeid, int destid, quadlet_t *data, u64 addr, size_t length, u16 fl) { struct sbp2scsi_host_info *hi; struct scsi_id_instance_data *scsi_id = NULL, *scsi_id_tmp; struct scsi_cmnd *SCpnt = NULL; struct sbp2_status_block *sb; u32 scsi_status = SBP2_SCSI_STATUS_GOOD; struct sbp2_command_info *command; unsigned long flags; SBP2_DEBUG_ENTER(); sbp2util_packet_dump(data, length, "sbp2 status write by device", (u32)addr); if (unlikely(length < 8 || length > sizeof(struct sbp2_status_block))) { SBP2_ERR("Wrong size of status block"); return RCODE_ADDRESS_ERROR; } if (unlikely(!host)) { SBP2_ERR("host is NULL - this is bad!"); return RCODE_ADDRESS_ERROR; } hi = hpsb_get_hostinfo(&sbp2_highlevel, host); if (unlikely(!hi)) { SBP2_ERR("host info is NULL - this is bad!"); return RCODE_ADDRESS_ERROR; } /* * Find our scsi_id structure by looking at the status fifo address * written to by the sbp2 device. */ list_for_each_entry(scsi_id_tmp, &hi->scsi_ids, scsi_list) { if (scsi_id_tmp->ne->nodeid == nodeid && scsi_id_tmp->status_fifo_addr == addr) { scsi_id = scsi_id_tmp; break; } } if (unlikely(!scsi_id)) { SBP2_ERR("scsi_id is NULL - device is gone?"); return RCODE_ADDRESS_ERROR; } /* * Put response into scsi_id status fifo buffer. The first two bytes * come in big endian bit order. Often the target writes only a * truncated status block, minimally the first two quadlets. The rest * is implied to be zeros. */ sb = &scsi_id->status_block; memset(sb->command_set_dependent, 0, sizeof(sb->command_set_dependent)); memcpy(sb, data, length); sbp2util_be32_to_cpu_buffer(sb, 8); /* * Ignore unsolicited status. Handle command ORB status. */ if (unlikely(STATUS_GET_SRC(sb->ORB_offset_hi_misc) == 2)) command = NULL; else command = sbp2util_find_command_for_orb(scsi_id, sb->ORB_offset_lo); if (command) { SBP2_DEBUG("Found status for command ORB"); pci_dma_sync_single_for_cpu(hi->host->pdev, command->command_orb_dma, sizeof(struct sbp2_command_orb), PCI_DMA_TODEVICE); pci_dma_sync_single_for_cpu(hi->host->pdev, command->sge_dma, sizeof(command->scatter_gather_element), PCI_DMA_BIDIRECTIONAL); SBP2_ORB_DEBUG("matched command orb %p", &command->command_orb); outstanding_orb_decr; /* * Matched status with command, now grab scsi command pointers * and check status. */ /* * FIXME: If the src field in the status is 1, the ORB DMA must * not be reused until status for a subsequent ORB is received. */ SCpnt = command->Current_SCpnt; spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags); sbp2util_mark_command_completed(scsi_id, command); spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags); if (SCpnt) { u32 h = sb->ORB_offset_hi_misc; u32 r = STATUS_GET_RESP(h); if (r != RESP_STATUS_REQUEST_COMPLETE) { SBP2_WARN("resp 0x%x, sbp_status 0x%x", r, STATUS_GET_SBP_STATUS(h)); scsi_status = r == RESP_STATUS_TRANSPORT_FAILURE ? SBP2_SCSI_STATUS_BUSY : SBP2_SCSI_STATUS_COMMAND_TERMINATED; } /* * See if the target stored any scsi status information. */ if (STATUS_GET_LEN(h) > 1) { SBP2_DEBUG("CHECK CONDITION"); scsi_status = sbp2_status_to_sense_data( (unchar *)sb, SCpnt->sense_buffer); } /* * Check to see if the dead bit is set. If so, we'll * have to initiate a fetch agent reset. */ if (STATUS_TEST_DEAD(h)) { SBP2_DEBUG("Dead bit set - " "initiating fetch agent reset"); sbp2_agent_reset(scsi_id, 0); } SBP2_ORB_DEBUG("completing command orb %p", &command->command_orb); } /* * Check here to see if there are no commands in-use. If there * are none, we know that the fetch agent left the active state * _and_ that we did not reactivate it yet. Therefore clear * last_orb so that next time we write directly to the * ORB_POINTER register. That way the fetch agent does not need * to refetch the next_ORB. */ spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags); if (list_empty(&scsi_id->sbp2_command_orb_inuse)) scsi_id->last_orb = NULL; spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags); } else { /* * It's probably a login/logout/reconnect status. */ if ((sb->ORB_offset_lo == scsi_id->reconnect_orb_dma) || (sb->ORB_offset_lo == scsi_id->login_orb_dma) || (sb->ORB_offset_lo == scsi_id->query_logins_orb_dma) || (sb->ORB_offset_lo == scsi_id->logout_orb_dma)) { scsi_id->access_complete = 1; wake_up_interruptible(&access_wq); } } if (SCpnt) { SBP2_DEBUG("Completing SCSI command"); sbp2scsi_complete_command(scsi_id, scsi_status, SCpnt, command->Current_done); SBP2_ORB_DEBUG("command orb completed"); } return RCODE_COMPLETE; } /************************************** * SCSI interface related section **************************************/ /* * This routine is the main request entry routine for doing I/O. It is * called from the scsi stack directly. */ static int sbp2scsi_queuecommand(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) { struct scsi_id_instance_data *scsi_id = (struct scsi_id_instance_data *)SCpnt->device->host->hostdata[0]; struct sbp2scsi_host_info *hi; int result = DID_NO_CONNECT << 16; SBP2_DEBUG_ENTER(); #if (CONFIG_IEEE1394_SBP2_DEBUG >= 2) || defined(CONFIG_IEEE1394_SBP2_PACKET_DUMP) scsi_print_command(SCpnt); #endif if (!sbp2util_node_is_available(scsi_id)) goto done; hi = scsi_id->hi; if (!hi) { SBP2_ERR("sbp2scsi_host_info is NULL - this is bad!"); goto done; } /* * Until we handle multiple luns, just return selection time-out * to any IO directed at non-zero LUNs */ if (SCpnt->device->lun) goto done; /* * Check for request sense command, and handle it here * (autorequest sense) */ if (SCpnt->cmnd[0] == REQUEST_SENSE) { SBP2_DEBUG("REQUEST_SENSE"); memcpy(SCpnt->request_buffer, SCpnt->sense_buffer, SCpnt->request_bufflen); memset(SCpnt->sense_buffer, 0, sizeof(SCpnt->sense_buffer)); sbp2scsi_complete_command(scsi_id, SBP2_SCSI_STATUS_GOOD, SCpnt, done); return 0; } /* * Check to see if we are in the middle of a bus reset. */ if (!hpsb_node_entry_valid(scsi_id->ne)) { SBP2_ERR("Bus reset in progress - rejecting command"); result = DID_BUS_BUSY << 16; goto done; } /* * Bidirectional commands are not yet implemented, * and unknown transfer direction not handled. */ if (SCpnt->sc_data_direction == DMA_BIDIRECTIONAL) { SBP2_ERR("Cannot handle DMA_BIDIRECTIONAL - rejecting command"); result = DID_ERROR << 16; goto done; } /* * Try and send our SCSI command */ if (sbp2_send_command(scsi_id, SCpnt, done)) { SBP2_ERR("Error sending SCSI command"); sbp2scsi_complete_command(scsi_id, SBP2_SCSI_STATUS_SELECTION_TIMEOUT, SCpnt, done); } return 0; done: SCpnt->result = result; done(SCpnt); return 0; } /* * This function is called in order to complete all outstanding SBP-2 * commands (in case of resets, etc.). */ static void sbp2scsi_complete_all_commands(struct scsi_id_instance_data *scsi_id, u32 status) { struct sbp2scsi_host_info *hi = scsi_id->hi; struct list_head *lh; struct sbp2_command_info *command; unsigned long flags; SBP2_DEBUG_ENTER(); spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags); while (!list_empty(&scsi_id->sbp2_command_orb_inuse)) { SBP2_DEBUG("Found pending command to complete"); lh = scsi_id->sbp2_command_orb_inuse.next; command = list_entry(lh, struct sbp2_command_info, list); pci_dma_sync_single_for_cpu(hi->host->pdev, command->command_orb_dma, sizeof(struct sbp2_command_orb), PCI_DMA_TODEVICE); pci_dma_sync_single_for_cpu(hi->host->pdev, command->sge_dma, sizeof(command->scatter_gather_element), PCI_DMA_BIDIRECTIONAL); sbp2util_mark_command_completed(scsi_id, command); if (command->Current_SCpnt) { command->Current_SCpnt->result = status << 16; command->Current_done(command->Current_SCpnt); } } spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags); return; } /* * This function is called in order to complete a regular SBP-2 command. * * This can be called in interrupt context. */ static void sbp2scsi_complete_command(struct scsi_id_instance_data *scsi_id, u32 scsi_status, struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) { SBP2_DEBUG_ENTER(); /* * Sanity */ if (!SCpnt) { SBP2_ERR("SCpnt is NULL"); return; } /* * If a bus reset is in progress and there was an error, don't * complete the command, just let it get retried at the end of the * bus reset. */ if (!hpsb_node_entry_valid(scsi_id->ne) && (scsi_status != SBP2_SCSI_STATUS_GOOD)) { SBP2_ERR("Bus reset in progress - retry command later"); return; } /* * Switch on scsi status */ switch (scsi_status) { case SBP2_SCSI_STATUS_GOOD: SCpnt->result = DID_OK << 16; break; case SBP2_SCSI_STATUS_BUSY: SBP2_ERR("SBP2_SCSI_STATUS_BUSY"); SCpnt->result = DID_BUS_BUSY << 16; break; case SBP2_SCSI_STATUS_CHECK_CONDITION: SBP2_DEBUG("SBP2_SCSI_STATUS_CHECK_CONDITION"); SCpnt->result = CHECK_CONDITION << 1 | DID_OK << 16; #if CONFIG_IEEE1394_SBP2_DEBUG >= 1 scsi_print_command(SCpnt); scsi_print_sense(SBP2_DEVICE_NAME, SCpnt); #endif break; case SBP2_SCSI_STATUS_SELECTION_TIMEOUT: SBP2_ERR("SBP2_SCSI_STATUS_SELECTION_TIMEOUT"); SCpnt->result = DID_NO_CONNECT << 16; scsi_print_command(SCpnt); break; case SBP2_SCSI_STATUS_CONDITION_MET: case SBP2_SCSI_STATUS_RESERVATION_CONFLICT: case SBP2_SCSI_STATUS_COMMAND_TERMINATED: SBP2_ERR("Bad SCSI status = %x", scsi_status); SCpnt->result = DID_ERROR << 16; scsi_print_command(SCpnt); break; default: SBP2_ERR("Unsupported SCSI status = %x", scsi_status); SCpnt->result = DID_ERROR << 16; } /* * If a bus reset is in progress and there was an error, complete * the command as busy so that it will get retried. */ if (!hpsb_node_entry_valid(scsi_id->ne) && (scsi_status != SBP2_SCSI_STATUS_GOOD)) { SBP2_ERR("Completing command with busy (bus reset)"); SCpnt->result = DID_BUS_BUSY << 16; } /* * If a unit attention occurs, return busy status so it gets * retried... it could have happened because of a 1394 bus reset * or hot-plug... * XXX DID_BUS_BUSY is actually a bad idea because it will defy * the scsi layer's retry logic. */ #if 0 if ((scsi_status == SBP2_SCSI_STATUS_CHECK_CONDITION) && (SCpnt->sense_buffer[2] == UNIT_ATTENTION)) { SBP2_DEBUG("UNIT ATTENTION - return busy"); SCpnt->result = DID_BUS_BUSY << 16; } #endif /* * Tell scsi stack that we're done with this command */ done(SCpnt); } static int sbp2scsi_slave_alloc(struct scsi_device *sdev) { struct scsi_id_instance_data *scsi_id = (struct scsi_id_instance_data *)sdev->host->hostdata[0]; scsi_id->sdev = sdev; sdev->allow_restart = 1; if (scsi_id->workarounds & SBP2_WORKAROUND_INQUIRY_36) sdev->inquiry_len = 36; return 0; } static int sbp2scsi_slave_configure(struct scsi_device *sdev) { struct scsi_id_instance_data *scsi_id = (struct scsi_id_instance_data *)sdev->host->hostdata[0]; blk_queue_dma_alignment(sdev->request_queue, (512 - 1)); sdev->use_10_for_rw = 1; if (sdev->type == TYPE_DISK && scsi_id->workarounds & SBP2_WORKAROUND_MODE_SENSE_8) sdev->skip_ms_page_8 = 1; if (scsi_id->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) sdev->fix_capacity = 1; return 0; } static void sbp2scsi_slave_destroy(struct scsi_device *sdev) { ((struct scsi_id_instance_data *)sdev->host->hostdata[0])->sdev = NULL; return; } /* * Called by scsi stack when something has really gone wrong. Usually * called when a command has timed-out for some reason. */ static int sbp2scsi_abort(struct scsi_cmnd *SCpnt) { struct scsi_id_instance_data *scsi_id = (struct scsi_id_instance_data *)SCpnt->device->host->hostdata[0]; struct sbp2scsi_host_info *hi = scsi_id->hi; struct sbp2_command_info *command; unsigned long flags; SBP2_ERR("aborting sbp2 command"); scsi_print_command(SCpnt); if (sbp2util_node_is_available(scsi_id)) { /* * Right now, just return any matching command structures * to the free pool. */ spin_lock_irqsave(&scsi_id->sbp2_command_orb_lock, flags); command = sbp2util_find_command_for_SCpnt(scsi_id, SCpnt); if (command) { SBP2_DEBUG("Found command to abort"); pci_dma_sync_single_for_cpu(hi->host->pdev, command->command_orb_dma, sizeof(struct sbp2_command_orb), PCI_DMA_TODEVICE); pci_dma_sync_single_for_cpu(hi->host->pdev, command->sge_dma, sizeof(command->scatter_gather_element), PCI_DMA_BIDIRECTIONAL); sbp2util_mark_command_completed(scsi_id, command); if (command->Current_SCpnt) { command->Current_SCpnt->result = DID_ABORT << 16; command->Current_done(command->Current_SCpnt); } } spin_unlock_irqrestore(&scsi_id->sbp2_command_orb_lock, flags); /* * Initiate a fetch agent reset. */ sbp2_agent_reset(scsi_id, 1); sbp2scsi_complete_all_commands(scsi_id, DID_BUS_BUSY); } return SUCCESS; } /* * Called by scsi stack when something has really gone wrong. */ static int sbp2scsi_reset(struct scsi_cmnd *SCpnt) { struct scsi_id_instance_data *scsi_id = (struct scsi_id_instance_data *)SCpnt->device->host->hostdata[0]; SBP2_ERR("reset requested"); if (sbp2util_node_is_available(scsi_id)) { SBP2_ERR("Generating sbp2 fetch agent reset"); sbp2_agent_reset(scsi_id, 1); } return SUCCESS; } static ssize_t sbp2_sysfs_ieee1394_id_show(struct device *dev, struct device_attribute *attr, char *buf) { struct scsi_device *sdev; struct scsi_id_instance_data *scsi_id; int lun; if (!(sdev = to_scsi_device(dev))) return 0; if (!(scsi_id = (struct scsi_id_instance_data *)sdev->host->hostdata[0])) return 0; lun = ORB_SET_LUN(scsi_id->sbp2_lun); return sprintf(buf, "%016Lx:%d:%d\n", (unsigned long long)scsi_id->ne->guid, scsi_id->ud->id, lun); } static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL); static struct device_attribute *sbp2_sysfs_sdev_attrs[] = { &dev_attr_ieee1394_id, NULL }; MODULE_AUTHOR("Ben Collins "); MODULE_DESCRIPTION("IEEE-1394 SBP-2 protocol driver"); MODULE_SUPPORTED_DEVICE(SBP2_DEVICE_NAME); MODULE_LICENSE("GPL"); /* SCSI host template */ static struct scsi_host_template scsi_driver_template = { .module = THIS_MODULE, .name = "SBP-2 IEEE-1394", .proc_name = SBP2_DEVICE_NAME, .queuecommand = sbp2scsi_queuecommand, .eh_abort_handler = sbp2scsi_abort, .eh_device_reset_handler = sbp2scsi_reset, .slave_alloc = sbp2scsi_slave_alloc, .slave_configure = sbp2scsi_slave_configure, .slave_destroy = sbp2scsi_slave_destroy, .this_id = -1, .sg_tablesize = SG_ALL, .use_clustering = ENABLE_CLUSTERING, .cmd_per_lun = SBP2_MAX_CMDS, .can_queue = SBP2_MAX_CMDS, .emulated = 1, .sdev_attrs = sbp2_sysfs_sdev_attrs, }; static int sbp2_module_init(void) { int ret; SBP2_DEBUG_ENTER(); /* Module load debug option to force one command at a time (serializing I/O) */ if (serialize_io) { SBP2_INFO("Driver forced to serialize I/O (serialize_io=1)"); SBP2_INFO("Try serialize_io=0 for better performance"); scsi_driver_template.can_queue = 1; scsi_driver_template.cmd_per_lun = 1; } if (sbp2_default_workarounds & SBP2_WORKAROUND_128K_MAX_TRANS && (max_sectors * 512) > (128 * 1024)) max_sectors = 128 * 1024 / 512; scsi_driver_template.max_sectors = max_sectors; /* Register our high level driver with 1394 stack */ hpsb_register_highlevel(&sbp2_highlevel); ret = hpsb_register_protocol(&sbp2_driver); if (ret) { SBP2_ERR("Failed to register protocol"); hpsb_unregister_highlevel(&sbp2_highlevel); return ret; } return 0; } static void __exit sbp2_module_exit(void) { SBP2_DEBUG_ENTER(); hpsb_unregister_protocol(&sbp2_driver); hpsb_unregister_highlevel(&sbp2_highlevel); } module_init(sbp2_module_init); module_exit(sbp2_module_exit);