| /* |
| * 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 <bcollins@debian.org> |
| * |
| * 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 (usually storage devices) as regular |
| * SCSI devices. E.g. mount /dev/sda1, fdisk, mkfs, etc.. |
| * |
| * See http://www.t10.org/drafts.htm#sbp2 for the final draft of the SBP-2 |
| * specification and for where to purchase the official standard. |
| * |
| * TODO: |
| * - look into possible improvements of the SCSI error handlers |
| * - handle Unit_Characteristics.mgt_ORB_timeout and .ORB_size |
| * - handle Logical_Unit_Number.ordered |
| * - handle src == 1 in status blocks |
| * - reimplement the DMA mapping in absence of physical DMA so that |
| * bus_to_virt is no longer required |
| * - debug the handling of absent physical DMA |
| * - replace CONFIG_IEEE1394_SBP2_PHYS_DMA by automatic detection |
| * (this is easy but depends on the previous two TODO items) |
| * - make the parameter serialize_io configurable per device |
| * - move all requests to fetch agent registers into non-atomic context, |
| * replace all usages of sbp2util_node_write_no_wait by true transactions |
| * Grep for inline FIXME comments below. |
| */ |
| |
| #include <linux/compiler.h> |
| #include <linux/delay.h> |
| #include <linux/device.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/gfp.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/list.h> |
| #include <linux/mm.h> |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/stat.h> |
| #include <linux/string.h> |
| #include <linux/stringify.h> |
| #include <linux/types.h> |
| #include <linux/wait.h> |
| #include <linux/workqueue.h> |
| |
| #include <asm/byteorder.h> |
| #include <asm/errno.h> |
| #include <asm/param.h> |
| #include <asm/scatterlist.h> |
| #include <asm/system.h> |
| #include <asm/types.h> |
| |
| #ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA |
| #include <asm/io.h> /* for bus_to_virt */ |
| #endif |
| |
| #include <scsi/scsi.h> |
| #include <scsi/scsi_cmnd.h> |
| #include <scsi/scsi_dbg.h> |
| #include <scsi/scsi_device.h> |
| #include <scsi/scsi_host.h> |
| |
| #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 sbp2_max_speed = IEEE1394_SPEED_MAX; |
| module_param_named(max_speed, sbp2_max_speed, int, 0644); |
| MODULE_PARM_DESC(max_speed, "Force max speed " |
| "(3 = 800Mb/s, 2 = 400Mb/s, 1 = 200Mb/s, 0 = 100Mb/s)"); |
| |
| /* |
| * 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. |
| */ |
| static int sbp2_serialize_io = 1; |
| module_param_named(serialize_io, sbp2_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 sbp2_max_sectors = SBP2_MAX_SECTORS; |
| module_param_named(max_sectors, sbp2_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 sbp2_exclusive_login = 1; |
| module_param_named(exclusive_login, sbp2_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)"); |
| |
| /* |
| * This influences the format of the sysfs attribute |
| * /sys/bus/scsi/devices/.../ieee1394_id. |
| * |
| * The default format is like in older kernels: %016Lx:%d:%d |
| * It contains the target's EUI-64, a number given to the logical unit by |
| * the ieee1394 driver's nodemgr (starting at 0), and the LUN. |
| * |
| * The long format is: %016Lx:%06x:%04x |
| * It contains the target's EUI-64, the unit directory's directory_ID as per |
| * IEEE 1212 clause 7.7.19, and the LUN. This format comes closest to the |
| * format of SBP(-3) target port and logical unit identifier as per SAM (SCSI |
| * Architecture Model) rev.2 to 4 annex A. Therefore and because it is |
| * independent of the implementation of the ieee1394 nodemgr, the longer format |
| * is recommended for future use. |
| */ |
| static int sbp2_long_sysfs_ieee1394_id; |
| module_param_named(long_ieee1394_id, sbp2_long_sysfs_ieee1394_id, bool, 0644); |
| MODULE_PARM_DESC(long_ieee1394_id, "8+3+2 bytes format of ieee1394_id in sysfs " |
| "(default = backwards-compatible = N, SAM-conforming = Y)"); |
| |
| |
| #define SBP2_INFO(fmt, args...) HPSB_INFO("sbp2: "fmt, ## args) |
| #define SBP2_ERR(fmt, args...) HPSB_ERR("sbp2: "fmt, ## args) |
| |
| /* |
| * Globals |
| */ |
| static void sbp2scsi_complete_all_commands(struct sbp2_lu *, u32); |
| static void sbp2scsi_complete_command(struct sbp2_lu *, u32, struct scsi_cmnd *, |
| void (*)(struct scsi_cmnd *)); |
| static struct sbp2_lu *sbp2_alloc_device(struct unit_directory *); |
| static int sbp2_start_device(struct sbp2_lu *); |
| static void sbp2_remove_device(struct sbp2_lu *); |
| static int sbp2_login_device(struct sbp2_lu *); |
| static int sbp2_reconnect_device(struct sbp2_lu *); |
| static int sbp2_logout_device(struct sbp2_lu *); |
| static void sbp2_host_reset(struct hpsb_host *); |
| static int sbp2_handle_status_write(struct hpsb_host *, int, int, quadlet_t *, |
| u64, size_t, u16); |
| static int sbp2_agent_reset(struct sbp2_lu *, int); |
| static void sbp2_parse_unit_directory(struct sbp2_lu *, |
| struct unit_directory *); |
| static int sbp2_set_busy_timeout(struct sbp2_lu *); |
| static int sbp2_max_speed_and_size(struct sbp2_lu *); |
| |
| |
| static const u8 sbp2_speedto_max_payload[] = { 0x7, 0x8, 0x9, 0xA, 0xB, 0xC }; |
| |
| 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 int sbp2_handle_physdma_write(struct hpsb_host *, int, int, quadlet_t *, |
| u64, size_t, u16); |
| static int sbp2_handle_physdma_read(struct hpsb_host *, int, quadlet_t *, u64, |
| size_t, u16); |
| |
| static struct hpsb_address_ops sbp2_physdma_ops = { |
| .read = sbp2_handle_physdma_read, |
| .write = sbp2_handle_physdma_write, |
| }; |
| #endif |
| |
| |
| /* |
| * Interface to driver core and IEEE 1394 core |
| */ |
| 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); |
| |
| static int sbp2_probe(struct device *); |
| static int sbp2_remove(struct device *); |
| static int sbp2_update(struct unit_directory *); |
| |
| static struct hpsb_protocol_driver sbp2_driver = { |
| .name = SBP2_DEVICE_NAME, |
| .id_table = sbp2_id_table, |
| .update = sbp2_update, |
| .driver = { |
| .probe = sbp2_probe, |
| .remove = sbp2_remove, |
| }, |
| }; |
| |
| |
| /* |
| * Interface to SCSI core |
| */ |
| static int sbp2scsi_queuecommand(struct scsi_cmnd *, |
| void (*)(struct scsi_cmnd *)); |
| static int sbp2scsi_abort(struct scsi_cmnd *); |
| static int sbp2scsi_reset(struct scsi_cmnd *); |
| static int sbp2scsi_slave_alloc(struct scsi_device *); |
| static int sbp2scsi_slave_configure(struct scsi_device *); |
| static void sbp2scsi_slave_destroy(struct scsi_device *); |
| static ssize_t sbp2_sysfs_ieee1394_id_show(struct device *, |
| struct device_attribute *, char *); |
| |
| 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 |
| }; |
| |
| static struct scsi_host_template sbp2_shost_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, |
| .sdev_attrs = sbp2_sysfs_sdev_attrs, |
| }; |
| |
| /* for match-all entries in sbp2_workarounds_table */ |
| #define SBP2_ROM_VALUE_WILDCARD 0x1000000 |
| |
| /* |
| * 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, |
| .model_id = SBP2_ROM_VALUE_WILDCARD, |
| .workarounds = SBP2_WORKAROUND_INQUIRY_36, |
| }, |
| /* Symbios bridge */ { |
| .firmware_revision = 0xa0b800, |
| .model_id = SBP2_ROM_VALUE_WILDCARD, |
| .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, |
| }, |
| /* 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]); |
| } |
| |
| /* |
| * 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]); |
| } |
| #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 |
| |
| static DECLARE_WAIT_QUEUE_HEAD(sbp2_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 sbp2_lu *lu, int timeout) |
| { |
| long leftover; |
| |
| leftover = wait_event_interruptible_timeout( |
| sbp2_access_wq, lu->access_complete, timeout); |
| lu->access_complete = 0; |
| return leftover <= 0; |
| } |
| |
| static void sbp2_free_packet(void *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 atomic context. |
| */ |
| static int sbp2util_node_write_no_wait(struct node_entry *ne, u64 addr, |
| quadlet_t *buf, size_t len) |
| { |
| struct hpsb_packet *packet; |
| |
| packet = hpsb_make_writepacket(ne->host, ne->nodeid, addr, buf, len); |
| if (!packet) |
| return -ENOMEM; |
| |
| hpsb_set_packet_complete_task(packet, 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 sbp2_lu *lu, 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(&lu->state) == SBP2LU_STATE_IN_RESET)) |
| return; |
| |
| if (hpsb_node_write(lu->ne, lu->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(&lu->state) != SBP2LU_STATE_IN_RESET)) |
| scsi_unblock_requests(lu->shost); |
| } |
| |
| static void sbp2util_write_orb_pointer(struct work_struct *work) |
| { |
| struct sbp2_lu *lu = container_of(work, struct sbp2_lu, protocol_work); |
| quadlet_t data[2]; |
| |
| data[0] = ORB_SET_NODE_ID(lu->hi->host->node_id); |
| data[1] = lu->last_orb_dma; |
| sbp2util_cpu_to_be32_buffer(data, 8); |
| sbp2util_notify_fetch_agent(lu, SBP2_ORB_POINTER_OFFSET, data, 8); |
| } |
| |
| static void sbp2util_write_doorbell(struct work_struct *work) |
| { |
| struct sbp2_lu *lu = container_of(work, struct sbp2_lu, protocol_work); |
| |
| sbp2util_notify_fetch_agent(lu, SBP2_DOORBELL_OFFSET, NULL, 4); |
| } |
| |
| static int sbp2util_create_command_orb_pool(struct sbp2_lu *lu) |
| { |
| struct sbp2_fwhost_info *hi = lu->hi; |
| struct sbp2_command_info *cmd; |
| int i, orbs = sbp2_serialize_io ? 2 : SBP2_MAX_CMDS; |
| |
| for (i = 0; i < orbs; i++) { |
| cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); |
| if (!cmd) |
| return -ENOMEM; |
| cmd->command_orb_dma = dma_map_single(hi->host->device.parent, |
| &cmd->command_orb, |
| sizeof(struct sbp2_command_orb), |
| DMA_TO_DEVICE); |
| cmd->sge_dma = dma_map_single(hi->host->device.parent, |
| &cmd->scatter_gather_element, |
| sizeof(cmd->scatter_gather_element), |
| DMA_TO_DEVICE); |
| INIT_LIST_HEAD(&cmd->list); |
| list_add_tail(&cmd->list, &lu->cmd_orb_completed); |
| } |
| return 0; |
| } |
| |
| static void sbp2util_remove_command_orb_pool(struct sbp2_lu *lu) |
| { |
| struct hpsb_host *host = lu->hi->host; |
| struct list_head *lh, *next; |
| struct sbp2_command_info *cmd; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&lu->cmd_orb_lock, flags); |
| if (!list_empty(&lu->cmd_orb_completed)) |
| list_for_each_safe(lh, next, &lu->cmd_orb_completed) { |
| cmd = list_entry(lh, struct sbp2_command_info, list); |
| dma_unmap_single(host->device.parent, |
| cmd->command_orb_dma, |
| sizeof(struct sbp2_command_orb), |
| DMA_TO_DEVICE); |
| dma_unmap_single(host->device.parent, cmd->sge_dma, |
| sizeof(cmd->scatter_gather_element), |
| DMA_TO_DEVICE); |
| kfree(cmd); |
| } |
| spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); |
| return; |
| } |
| |
| /* |
| * Finds the sbp2_command for a given outstanding command ORB. |
| * Only looks at the in-use list. |
| */ |
| static struct sbp2_command_info *sbp2util_find_command_for_orb( |
| struct sbp2_lu *lu, dma_addr_t orb) |
| { |
| struct sbp2_command_info *cmd; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&lu->cmd_orb_lock, flags); |
| if (!list_empty(&lu->cmd_orb_inuse)) |
| list_for_each_entry(cmd, &lu->cmd_orb_inuse, list) |
| if (cmd->command_orb_dma == orb) { |
| spin_unlock_irqrestore( |
| &lu->cmd_orb_lock, flags); |
| return cmd; |
| } |
| spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); |
| return NULL; |
| } |
| |
| /* |
| * Finds the sbp2_command for a given outstanding SCpnt. |
| * Only looks at the in-use list. |
| * Must be called with lu->cmd_orb_lock held. |
| */ |
| static struct sbp2_command_info *sbp2util_find_command_for_SCpnt( |
| struct sbp2_lu *lu, void *SCpnt) |
| { |
| struct sbp2_command_info *cmd; |
| |
| if (!list_empty(&lu->cmd_orb_inuse)) |
| list_for_each_entry(cmd, &lu->cmd_orb_inuse, list) |
| if (cmd->Current_SCpnt == SCpnt) |
| return cmd; |
| return NULL; |
| } |
| |
| static struct sbp2_command_info *sbp2util_allocate_command_orb( |
| struct sbp2_lu *lu, |
| struct scsi_cmnd *Current_SCpnt, |
| void (*Current_done)(struct scsi_cmnd *)) |
| { |
| struct list_head *lh; |
| struct sbp2_command_info *cmd = NULL; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&lu->cmd_orb_lock, flags); |
| if (!list_empty(&lu->cmd_orb_completed)) { |
| lh = lu->cmd_orb_completed.next; |
| list_del(lh); |
| cmd = list_entry(lh, struct sbp2_command_info, list); |
| cmd->Current_done = Current_done; |
| cmd->Current_SCpnt = Current_SCpnt; |
| list_add_tail(&cmd->list, &lu->cmd_orb_inuse); |
| } else |
| SBP2_ERR("%s: no orbs available", __FUNCTION__); |
| spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); |
| return cmd; |
| } |
| |
| /* |
| * Unmaps the DMAs of a command and moves the command to the completed ORB list. |
| * Must be called with lu->cmd_orb_lock held. |
| */ |
| static void sbp2util_mark_command_completed(struct sbp2_lu *lu, |
| struct sbp2_command_info *cmd) |
| { |
| struct hpsb_host *host = lu->ud->ne->host; |
| |
| if (cmd->cmd_dma) { |
| if (cmd->dma_type == CMD_DMA_SINGLE) |
| dma_unmap_single(host->device.parent, cmd->cmd_dma, |
| cmd->dma_size, cmd->dma_dir); |
| else if (cmd->dma_type == CMD_DMA_PAGE) |
| dma_unmap_page(host->device.parent, cmd->cmd_dma, |
| cmd->dma_size, cmd->dma_dir); |
| /* XXX: Check for CMD_DMA_NONE bug */ |
| cmd->dma_type = CMD_DMA_NONE; |
| cmd->cmd_dma = 0; |
| } |
| if (cmd->sge_buffer) { |
| dma_unmap_sg(host->device.parent, cmd->sge_buffer, |
| cmd->dma_size, cmd->dma_dir); |
| cmd->sge_buffer = NULL; |
| } |
| list_move_tail(&cmd->list, &lu->cmd_orb_completed); |
| } |
| |
| /* |
| * Is lu valid? Is the 1394 node still present? |
| */ |
| static inline int sbp2util_node_is_available(struct sbp2_lu *lu) |
| { |
| return lu && lu->ne && !lu->ne->in_limbo; |
| } |
| |
| /********************************************* |
| * IEEE-1394 core driver stack related section |
| *********************************************/ |
| |
| static int sbp2_probe(struct device *dev) |
| { |
| struct unit_directory *ud; |
| struct sbp2_lu *lu; |
| |
| 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; |
| |
| lu = sbp2_alloc_device(ud); |
| if (!lu) |
| return -ENOMEM; |
| |
| sbp2_parse_unit_directory(lu, ud); |
| return sbp2_start_device(lu); |
| } |
| |
| static int sbp2_remove(struct device *dev) |
| { |
| struct unit_directory *ud; |
| struct sbp2_lu *lu; |
| struct scsi_device *sdev; |
| |
| ud = container_of(dev, struct unit_directory, device); |
| lu = ud->device.driver_data; |
| if (!lu) |
| return 0; |
| |
| if (lu->shost) { |
| /* Get rid of enqueued commands if there is no chance to |
| * send them. */ |
| if (!sbp2util_node_is_available(lu)) |
| sbp2scsi_complete_all_commands(lu, DID_NO_CONNECT); |
| /* scsi_remove_device() may trigger shutdown functions of SCSI |
| * highlevel drivers which would deadlock if blocked. */ |
| atomic_set(&lu->state, SBP2LU_STATE_IN_SHUTDOWN); |
| scsi_unblock_requests(lu->shost); |
| } |
| sdev = lu->sdev; |
| if (sdev) { |
| lu->sdev = NULL; |
| scsi_remove_device(sdev); |
| } |
| |
| sbp2_logout_device(lu); |
| sbp2_remove_device(lu); |
| |
| return 0; |
| } |
| |
| static int sbp2_update(struct unit_directory *ud) |
| { |
| struct sbp2_lu *lu = ud->device.driver_data; |
| |
| if (sbp2_reconnect_device(lu)) { |
| /* Reconnect has failed. Perhaps we didn't reconnect fast |
| * enough. Try a regular login, but first log out just in |
| * case of any weirdness. */ |
| sbp2_logout_device(lu); |
| |
| if (sbp2_login_device(lu)) { |
| /* 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; |
| } |
| } |
| |
| sbp2_set_busy_timeout(lu); |
| sbp2_agent_reset(lu, 1); |
| sbp2_max_speed_and_size(lu); |
| |
| /* Complete any pending commands with busy (so they get retried) |
| * and remove them from our queue. */ |
| sbp2scsi_complete_all_commands(lu, DID_BUS_BUSY); |
| |
| /* Accept new commands unless there was another bus reset in the |
| * meantime. */ |
| if (hpsb_node_entry_valid(lu->ne)) { |
| atomic_set(&lu->state, SBP2LU_STATE_RUNNING); |
| scsi_unblock_requests(lu->shost); |
| } |
| return 0; |
| } |
| |
| static struct sbp2_lu *sbp2_alloc_device(struct unit_directory *ud) |
| { |
| struct sbp2_fwhost_info *hi; |
| struct Scsi_Host *shost = NULL; |
| struct sbp2_lu *lu = NULL; |
| |
| lu = kzalloc(sizeof(*lu), GFP_KERNEL); |
| if (!lu) { |
| SBP2_ERR("failed to create lu"); |
| goto failed_alloc; |
| } |
| |
| lu->ne = ud->ne; |
| lu->ud = ud; |
| lu->speed_code = IEEE1394_SPEED_100; |
| lu->max_payload_size = sbp2_speedto_max_payload[IEEE1394_SPEED_100]; |
| lu->status_fifo_addr = CSR1212_INVALID_ADDR_SPACE; |
| INIT_LIST_HEAD(&lu->cmd_orb_inuse); |
| INIT_LIST_HEAD(&lu->cmd_orb_completed); |
| INIT_LIST_HEAD(&lu->lu_list); |
| spin_lock_init(&lu->cmd_orb_lock); |
| atomic_set(&lu->state, SBP2LU_STATE_RUNNING); |
| INIT_WORK(&lu->protocol_work, NULL); |
| |
| ud->device.driver_data = lu; |
| |
| 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; |
| } |
| hi->host = ud->ne->host; |
| INIT_LIST_HEAD(&hi->logical_units); |
| |
| #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; |
| } |
| #else |
| if (dma_set_mask(hi->host->device.parent, DMA_32BIT_MASK)) { |
| SBP2_ERR("failed to set 4GB DMA mask"); |
| 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; |
| } |
| |
| lu->hi = hi; |
| |
| list_add_tail(&lu->lu_list, &hi->logical_units); |
| |
| /* 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. |
| */ |
| lu->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 (lu->status_fifo_addr == CSR1212_INVALID_ADDR_SPACE) { |
| SBP2_ERR("failed to allocate status FIFO address range"); |
| goto failed_alloc; |
| } |
| |
| shost = scsi_host_alloc(&sbp2_shost_template, sizeof(unsigned long)); |
| if (!shost) { |
| SBP2_ERR("failed to register scsi host"); |
| goto failed_alloc; |
| } |
| |
| shost->hostdata[0] = (unsigned long)lu; |
| |
| if (!scsi_add_host(shost, &ud->device)) { |
| lu->shost = shost; |
| return lu; |
| } |
| |
| SBP2_ERR("failed to add scsi host"); |
| scsi_host_put(shost); |
| |
| failed_alloc: |
| sbp2_remove_device(lu); |
| return NULL; |
| } |
| |
| static void sbp2_host_reset(struct hpsb_host *host) |
| { |
| struct sbp2_fwhost_info *hi; |
| struct sbp2_lu *lu; |
| |
| hi = hpsb_get_hostinfo(&sbp2_highlevel, host); |
| if (!hi) |
| return; |
| list_for_each_entry(lu, &hi->logical_units, lu_list) |
| if (likely(atomic_read(&lu->state) != |
| SBP2LU_STATE_IN_SHUTDOWN)) { |
| atomic_set(&lu->state, SBP2LU_STATE_IN_RESET); |
| scsi_block_requests(lu->shost); |
| } |
| } |
| |
| static int sbp2_start_device(struct sbp2_lu *lu) |
| { |
| struct sbp2_fwhost_info *hi = lu->hi; |
| int error; |
| |
| lu->login_response = dma_alloc_coherent(hi->host->device.parent, |
| sizeof(struct sbp2_login_response), |
| &lu->login_response_dma, GFP_KERNEL); |
| if (!lu->login_response) |
| goto alloc_fail; |
| |
| lu->query_logins_orb = dma_alloc_coherent(hi->host->device.parent, |
| sizeof(struct sbp2_query_logins_orb), |
| &lu->query_logins_orb_dma, GFP_KERNEL); |
| if (!lu->query_logins_orb) |
| goto alloc_fail; |
| |
| lu->query_logins_response = dma_alloc_coherent(hi->host->device.parent, |
| sizeof(struct sbp2_query_logins_response), |
| &lu->query_logins_response_dma, GFP_KERNEL); |
| if (!lu->query_logins_response) |
| goto alloc_fail; |
| |
| lu->reconnect_orb = dma_alloc_coherent(hi->host->device.parent, |
| sizeof(struct sbp2_reconnect_orb), |
| &lu->reconnect_orb_dma, GFP_KERNEL); |
| if (!lu->reconnect_orb) |
| goto alloc_fail; |
| |
| lu->logout_orb = dma_alloc_coherent(hi->host->device.parent, |
| sizeof(struct sbp2_logout_orb), |
| &lu->logout_orb_dma, GFP_KERNEL); |
| if (!lu->logout_orb) |
| goto alloc_fail; |
| |
| lu->login_orb = dma_alloc_coherent(hi->host->device.parent, |
| sizeof(struct sbp2_login_orb), |
| &lu->login_orb_dma, GFP_KERNEL); |
| if (!lu->login_orb) |
| goto alloc_fail; |
| |
| if (sbp2util_create_command_orb_pool(lu)) |
| goto alloc_fail; |
| |
| /* Wait a second before trying to log in. Previously logged in |
| * initiators need a chance to reconnect. */ |
| if (msleep_interruptible(1000)) { |
| sbp2_remove_device(lu); |
| return -EINTR; |
| } |
| |
| if (sbp2_login_device(lu)) { |
| sbp2_remove_device(lu); |
| return -EBUSY; |
| } |
| |
| sbp2_set_busy_timeout(lu); |
| sbp2_agent_reset(lu, 1); |
| sbp2_max_speed_and_size(lu); |
| |
| error = scsi_add_device(lu->shost, 0, lu->ud->id, 0); |
| if (error) { |
| SBP2_ERR("scsi_add_device failed"); |
| sbp2_logout_device(lu); |
| sbp2_remove_device(lu); |
| return error; |
| } |
| |
| return 0; |
| |
| alloc_fail: |
| SBP2_ERR("Could not allocate memory for lu"); |
| sbp2_remove_device(lu); |
| return -ENOMEM; |
| } |
| |
| static void sbp2_remove_device(struct sbp2_lu *lu) |
| { |
| struct sbp2_fwhost_info *hi; |
| |
| if (!lu) |
| return; |
| |
| hi = lu->hi; |
| |
| if (lu->shost) { |
| scsi_remove_host(lu->shost); |
| scsi_host_put(lu->shost); |
| } |
| flush_scheduled_work(); |
| sbp2util_remove_command_orb_pool(lu); |
| |
| list_del(&lu->lu_list); |
| |
| if (lu->login_response) |
| dma_free_coherent(hi->host->device.parent, |
| sizeof(struct sbp2_login_response), |
| lu->login_response, |
| lu->login_response_dma); |
| if (lu->login_orb) |
| dma_free_coherent(hi->host->device.parent, |
| sizeof(struct sbp2_login_orb), |
| lu->login_orb, |
| lu->login_orb_dma); |
| if (lu->reconnect_orb) |
| dma_free_coherent(hi->host->device.parent, |
| sizeof(struct sbp2_reconnect_orb), |
| lu->reconnect_orb, |
| lu->reconnect_orb_dma); |
| if (lu->logout_orb) |
| dma_free_coherent(hi->host->device.parent, |
| sizeof(struct sbp2_logout_orb), |
| lu->logout_orb, |
| lu->logout_orb_dma); |
| if (lu->query_logins_orb) |
| dma_free_coherent(hi->host->device.parent, |
| sizeof(struct sbp2_query_logins_orb), |
| lu->query_logins_orb, |
| lu->query_logins_orb_dma); |
| if (lu->query_logins_response) |
| dma_free_coherent(hi->host->device.parent, |
| sizeof(struct sbp2_query_logins_response), |
| lu->query_logins_response, |
| lu->query_logins_response_dma); |
| |
| if (lu->status_fifo_addr != CSR1212_INVALID_ADDR_SPACE) |
| hpsb_unregister_addrspace(&sbp2_highlevel, hi->host, |
| lu->status_fifo_addr); |
| |
| lu->ud->device.driver_data = NULL; |
| |
| if (hi) |
| module_put(hi->host->driver->owner); |
| |
| kfree(lu); |
| } |
| |
| #ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA |
| /* |
| * Deal with write requests on adapters which do not support physical DMA or |
| * have it switched off. |
| */ |
| static int sbp2_handle_physdma_write(struct hpsb_host *host, int nodeid, |
| int destid, quadlet_t *data, u64 addr, |
| size_t length, u16 flags) |
| { |
| memcpy(bus_to_virt((u32) addr), data, length); |
| return RCODE_COMPLETE; |
| } |
| |
| /* |
| * Deal with read requests on adapters which do not support physical DMA or |
| * have it switched off. |
| */ |
| static int sbp2_handle_physdma_read(struct hpsb_host *host, int nodeid, |
| quadlet_t *data, u64 addr, size_t length, |
| u16 flags) |
| { |
| memcpy(data, bus_to_virt((u32) addr), length); |
| return RCODE_COMPLETE; |
| } |
| #endif |
| |
| /************************************** |
| * SBP-2 protocol related section |
| **************************************/ |
| |
| static int sbp2_query_logins(struct sbp2_lu *lu) |
| { |
| struct sbp2_fwhost_info *hi = lu->hi; |
| quadlet_t data[2]; |
| int max_logins; |
| int active_logins; |
| |
| lu->query_logins_orb->reserved1 = 0x0; |
| lu->query_logins_orb->reserved2 = 0x0; |
| |
| lu->query_logins_orb->query_response_lo = lu->query_logins_response_dma; |
| lu->query_logins_orb->query_response_hi = |
| ORB_SET_NODE_ID(hi->host->node_id); |
| lu->query_logins_orb->lun_misc = |
| ORB_SET_FUNCTION(SBP2_QUERY_LOGINS_REQUEST); |
| lu->query_logins_orb->lun_misc |= ORB_SET_NOTIFY(1); |
| lu->query_logins_orb->lun_misc |= ORB_SET_LUN(lu->lun); |
| |
| lu->query_logins_orb->reserved_resp_length = |
| ORB_SET_QUERY_LOGINS_RESP_LENGTH( |
| sizeof(struct sbp2_query_logins_response)); |
| |
| lu->query_logins_orb->status_fifo_hi = |
| ORB_SET_STATUS_FIFO_HI(lu->status_fifo_addr, hi->host->node_id); |
| lu->query_logins_orb->status_fifo_lo = |
| ORB_SET_STATUS_FIFO_LO(lu->status_fifo_addr); |
| |
| sbp2util_cpu_to_be32_buffer(lu->query_logins_orb, |
| sizeof(struct sbp2_query_logins_orb)); |
| |
| memset(lu->query_logins_response, 0, |
| sizeof(struct sbp2_query_logins_response)); |
| |
| data[0] = ORB_SET_NODE_ID(hi->host->node_id); |
| data[1] = lu->query_logins_orb_dma; |
| sbp2util_cpu_to_be32_buffer(data, 8); |
| |
| hpsb_node_write(lu->ne, lu->management_agent_addr, data, 8); |
| |
| if (sbp2util_access_timeout(lu, 2*HZ)) { |
| SBP2_INFO("Error querying logins to SBP-2 device - timed out"); |
| return -EIO; |
| } |
| |
| if (lu->status_block.ORB_offset_lo != lu->query_logins_orb_dma) { |
| SBP2_INFO("Error querying logins to SBP-2 device - timed out"); |
| return -EIO; |
| } |
| |
| if (STATUS_TEST_RDS(lu->status_block.ORB_offset_hi_misc)) { |
| SBP2_INFO("Error querying logins to SBP-2 device - failed"); |
| return -EIO; |
| } |
| |
| sbp2util_cpu_to_be32_buffer(lu->query_logins_response, |
| sizeof(struct sbp2_query_logins_response)); |
| |
| max_logins = RESPONSE_GET_MAX_LOGINS( |
| lu->query_logins_response->length_max_logins); |
| SBP2_INFO("Maximum concurrent logins supported: %d", max_logins); |
| |
| active_logins = RESPONSE_GET_ACTIVE_LOGINS( |
| lu->query_logins_response->length_max_logins); |
| SBP2_INFO("Number of active logins: %d", active_logins); |
| |
| if (active_logins >= max_logins) { |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| static int sbp2_login_device(struct sbp2_lu *lu) |
| { |
| struct sbp2_fwhost_info *hi = lu->hi; |
| quadlet_t data[2]; |
| |
| if (!lu->login_orb) |
| return -EIO; |
| |
| if (!sbp2_exclusive_login && sbp2_query_logins(lu)) { |
| SBP2_INFO("Device does not support any more concurrent logins"); |
| return -EIO; |
| } |
| |
| /* assume no password */ |
| lu->login_orb->password_hi = 0; |
| lu->login_orb->password_lo = 0; |
| |
| lu->login_orb->login_response_lo = lu->login_response_dma; |
| lu->login_orb->login_response_hi = ORB_SET_NODE_ID(hi->host->node_id); |
| lu->login_orb->lun_misc = ORB_SET_FUNCTION(SBP2_LOGIN_REQUEST); |
| |
| /* one second reconnect time */ |
| lu->login_orb->lun_misc |= ORB_SET_RECONNECT(0); |
| lu->login_orb->lun_misc |= ORB_SET_EXCLUSIVE(sbp2_exclusive_login); |
| lu->login_orb->lun_misc |= ORB_SET_NOTIFY(1); |
| lu->login_orb->lun_misc |= ORB_SET_LUN(lu->lun); |
| |
| lu->login_orb->passwd_resp_lengths = |
| ORB_SET_LOGIN_RESP_LENGTH(sizeof(struct sbp2_login_response)); |
| |
| lu->login_orb->status_fifo_hi = |
| ORB_SET_STATUS_FIFO_HI(lu->status_fifo_addr, hi->host->node_id); |
| lu->login_orb->status_fifo_lo = |
| ORB_SET_STATUS_FIFO_LO(lu->status_fifo_addr); |
| |
| sbp2util_cpu_to_be32_buffer(lu->login_orb, |
| sizeof(struct sbp2_login_orb)); |
| |
| memset(lu->login_response, 0, sizeof(struct sbp2_login_response)); |
| |
| data[0] = ORB_SET_NODE_ID(hi->host->node_id); |
| data[1] = lu->login_orb_dma; |
| sbp2util_cpu_to_be32_buffer(data, 8); |
| |
| hpsb_node_write(lu->ne, lu->management_agent_addr, data, 8); |
| |
| /* wait up to 20 seconds for login status */ |
| if (sbp2util_access_timeout(lu, 20*HZ)) { |
| SBP2_ERR("Error logging into SBP-2 device - timed out"); |
| return -EIO; |
| } |
| |
| /* make sure that the returned status matches the login ORB */ |
| if (lu->status_block.ORB_offset_lo != lu->login_orb_dma) { |
| SBP2_ERR("Error logging into SBP-2 device - timed out"); |
| return -EIO; |
| } |
| |
| if (STATUS_TEST_RDS(lu->status_block.ORB_offset_hi_misc)) { |
| SBP2_ERR("Error logging into SBP-2 device - failed"); |
| return -EIO; |
| } |
| |
| sbp2util_cpu_to_be32_buffer(lu->login_response, |
| sizeof(struct sbp2_login_response)); |
| lu->command_block_agent_addr = |
| ((u64)lu->login_response->command_block_agent_hi) << 32; |
| lu->command_block_agent_addr |= |
| ((u64)lu->login_response->command_block_agent_lo); |
| lu->command_block_agent_addr &= 0x0000ffffffffffffULL; |
| |
| SBP2_INFO("Logged into SBP-2 device"); |
| return 0; |
| } |
| |
| static int sbp2_logout_device(struct sbp2_lu *lu) |
| { |
| struct sbp2_fwhost_info *hi = lu->hi; |
| quadlet_t data[2]; |
| int error; |
| |
| lu->logout_orb->reserved1 = 0x0; |
| lu->logout_orb->reserved2 = 0x0; |
| lu->logout_orb->reserved3 = 0x0; |
| lu->logout_orb->reserved4 = 0x0; |
| |
| lu->logout_orb->login_ID_misc = ORB_SET_FUNCTION(SBP2_LOGOUT_REQUEST); |
| lu->logout_orb->login_ID_misc |= |
| ORB_SET_LOGIN_ID(lu->login_response->length_login_ID); |
| lu->logout_orb->login_ID_misc |= ORB_SET_NOTIFY(1); |
| |
| lu->logout_orb->reserved5 = 0x0; |
| lu->logout_orb->status_fifo_hi = |
| ORB_SET_STATUS_FIFO_HI(lu->status_fifo_addr, hi->host->node_id); |
| lu->logout_orb->status_fifo_lo = |
| ORB_SET_STATUS_FIFO_LO(lu->status_fifo_addr); |
| |
| sbp2util_cpu_to_be32_buffer(lu->logout_orb, |
| sizeof(struct sbp2_logout_orb)); |
| |
| data[0] = ORB_SET_NODE_ID(hi->host->node_id); |
| data[1] = lu->logout_orb_dma; |
| sbp2util_cpu_to_be32_buffer(data, 8); |
| |
| error = hpsb_node_write(lu->ne, lu->management_agent_addr, data, 8); |
| if (error) |
| return error; |
| |
| /* wait up to 1 second for the device to complete logout */ |
| if (sbp2util_access_timeout(lu, HZ)) |
| return -EIO; |
| |
| SBP2_INFO("Logged out of SBP-2 device"); |
| return 0; |
| } |
| |
| static int sbp2_reconnect_device(struct sbp2_lu *lu) |
| { |
| struct sbp2_fwhost_info *hi = lu->hi; |
| quadlet_t data[2]; |
| int error; |
| |
| lu->reconnect_orb->reserved1 = 0x0; |
| lu->reconnect_orb->reserved2 = 0x0; |
| lu->reconnect_orb->reserved3 = 0x0; |
| lu->reconnect_orb->reserved4 = 0x0; |
| |
| lu->reconnect_orb->login_ID_misc = |
| ORB_SET_FUNCTION(SBP2_RECONNECT_REQUEST); |
| lu->reconnect_orb->login_ID_misc |= |
| ORB_SET_LOGIN_ID(lu->login_response->length_login_ID); |
| lu->reconnect_orb->login_ID_misc |= ORB_SET_NOTIFY(1); |
| |
| lu->reconnect_orb->reserved5 = 0x0; |
| lu->reconnect_orb->status_fifo_hi = |
| ORB_SET_STATUS_FIFO_HI(lu->status_fifo_addr, hi->host->node_id); |
| lu->reconnect_orb->status_fifo_lo = |
| ORB_SET_STATUS_FIFO_LO(lu->status_fifo_addr); |
| |
| sbp2util_cpu_to_be32_buffer(lu->reconnect_orb, |
| sizeof(struct sbp2_reconnect_orb)); |
| |
| data[0] = ORB_SET_NODE_ID(hi->host->node_id); |
| data[1] = lu->reconnect_orb_dma; |
| sbp2util_cpu_to_be32_buffer(data, 8); |
| |
| error = hpsb_node_write(lu->ne, lu->management_agent_addr, data, 8); |
| if (error) |
| return error; |
| |
| /* wait up to 1 second for reconnect status */ |
| if (sbp2util_access_timeout(lu, HZ)) { |
| SBP2_ERR("Error reconnecting to SBP-2 device - timed out"); |
| return -EIO; |
| } |
| |
| /* make sure that the returned status matches the reconnect ORB */ |
| if (lu->status_block.ORB_offset_lo != lu->reconnect_orb_dma) { |
| SBP2_ERR("Error reconnecting to SBP-2 device - timed out"); |
| return -EIO; |
| } |
| |
| if (STATUS_TEST_RDS(lu->status_block.ORB_offset_hi_misc)) { |
| SBP2_ERR("Error reconnecting to SBP-2 device - failed"); |
| return -EIO; |
| } |
| |
| SBP2_INFO("Reconnected to SBP-2 device"); |
| return 0; |
| } |
| |
| /* |
| * Set the target node's Single Phase Retry limit. Affects the target's retry |
| * behaviour if our node is too busy to accept requests. |
| */ |
| static int sbp2_set_busy_timeout(struct sbp2_lu *lu) |
| { |
| quadlet_t data; |
| |
| data = cpu_to_be32(SBP2_BUSY_TIMEOUT_VALUE); |
| if (hpsb_node_write(lu->ne, SBP2_BUSY_TIMEOUT_ADDRESS, &data, 4)) |
| SBP2_ERR("%s error", __FUNCTION__); |
| return 0; |
| } |
| |
| static void sbp2_parse_unit_directory(struct sbp2_lu *lu, |
| struct unit_directory *ud) |
| { |
| struct csr1212_keyval *kv; |
| struct csr1212_dentry *dentry; |
| u64 management_agent_addr; |
| u32 unit_characteristics, firmware_revision; |
| unsigned workarounds; |
| int i; |
| |
| management_agent_addr = 0; |
| unit_characteristics = 0; |
| firmware_revision = 0; |
| |
| 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) |
| management_agent_addr = |
| CSR1212_REGISTER_SPACE_BASE + |
| (kv->value.csr_offset << 2); |
| |
| else if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) |
| lu->lun = ORB_SET_LUN(kv->value.immediate); |
| break; |
| |
| case SBP2_UNIT_CHARACTERISTICS_KEY: |
| /* FIXME: This is ignored so far. |
| * See SBP-2 clause 7.4.8. */ |
| unit_characteristics = kv->value.immediate; |
| break; |
| |
| case SBP2_FIRMWARE_REVISION_KEY: |
| firmware_revision = kv->value.immediate; |
| break; |
| |
| default: |
| /* FIXME: Check for SBP2_DEVICE_TYPE_AND_LUN_KEY. |
| * Its "ordered" bit has consequences for command ORB |
| * list handling. See SBP-2 clauses 4.6, 7.4.11, 10.2 */ |
| 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_ROM_VALUE_WILDCARD && |
| sbp2_workarounds_table[i].firmware_revision != |
| (firmware_revision & 0xffff00)) |
| continue; |
| if (sbp2_workarounds_table[i].model_id != |
| SBP2_ROM_VALUE_WILDCARD && |
| 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 && |
| (sbp2_max_sectors * 512) > (128 * 1024)) |
| SBP2_INFO("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), |
| sbp2_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(lu, parent_ud); |
| } else { |
| lu->management_agent_addr = management_agent_addr; |
| lu->workarounds = workarounds; |
| if (ud->flags & UNIT_DIRECTORY_HAS_LUN) |
| lu->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 sbp2_lu *lu) |
| { |
| struct sbp2_fwhost_info *hi = lu->hi; |
| u8 payload; |
| |
| lu->speed_code = hi->host->speed[NODEID_TO_NODE(lu->ne->nodeid)]; |
| |
| if (lu->speed_code > sbp2_max_speed) { |
| lu->speed_code = sbp2_max_speed; |
| SBP2_INFO("Reducing speed to %s", |
| hpsb_speedto_str[sbp2_max_speed]); |
| } |
| |
| /* Payload size is the lesser of what our speed supports and what |
| * our host supports. */ |
| payload = min(sbp2_speedto_max_payload[lu->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 (lu->ne->host->low_addr_space < (1ULL << 32)) |
| while (SBP2_PAYLOAD_TO_BYTES(payload) + 24 > PAGE_SIZE && |
| payload) |
| payload--; |
| |
| SBP2_INFO("Node " NODE_BUS_FMT ": Max speed [%s] - Max payload [%u]", |
| NODE_BUS_ARGS(hi->host, lu->ne->nodeid), |
| hpsb_speedto_str[lu->speed_code], |
| SBP2_PAYLOAD_TO_BYTES(payload)); |
| |
| lu->max_payload_size = payload; |
| return 0; |
| } |
| |
| static int sbp2_agent_reset(struct sbp2_lu *lu, int wait) |
| { |
| quadlet_t data; |
| u64 addr; |
| int retval; |
| unsigned long flags; |
| |
| /* flush lu->protocol_work */ |
| if (wait) |
| flush_scheduled_work(); |
| |
| data = ntohl(SBP2_AGENT_RESET_DATA); |
| addr = lu->command_block_agent_addr + SBP2_AGENT_RESET_OFFSET; |
| |
| if (wait) |
| retval = hpsb_node_write(lu->ne, addr, &data, 4); |
| else |
| retval = sbp2util_node_write_no_wait(lu->ne, addr, &data, 4); |
| |
| if (retval < 0) { |
| SBP2_ERR("hpsb_node_write failed.\n"); |
| return -EIO; |
| } |
| |
| /* make sure that the ORB_POINTER is written on next command */ |
| spin_lock_irqsave(&lu->cmd_orb_lock, flags); |
| lu->last_orb = NULL; |
| spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); |
| |
| return 0; |
| } |
| |
| static void sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb, |
| struct sbp2_fwhost_info *hi, |
| struct sbp2_command_info *cmd, |
| unsigned int scsi_use_sg, |
| struct scatterlist *sgpnt, |
| u32 orb_direction, |
| enum dma_data_direction dma_dir) |
| { |
| cmd->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)) { |
| |
| cmd->dma_size = sgpnt[0].length; |
| cmd->dma_type = CMD_DMA_PAGE; |
| cmd->cmd_dma = dma_map_page(hi->host->device.parent, |
| sgpnt[0].page, sgpnt[0].offset, |
| cmd->dma_size, cmd->dma_dir); |
| |
| orb->data_descriptor_lo = cmd->cmd_dma; |
| orb->misc |= ORB_SET_DATA_SIZE(cmd->dma_size); |
| |
| } else { |
| struct sbp2_unrestricted_page_table *sg_element = |
| &cmd->scatter_gather_element[0]; |
| u32 sg_count, sg_len; |
| dma_addr_t sg_addr; |
| int i, count = dma_map_sg(hi->host->device.parent, sgpnt, |
| scsi_use_sg, dma_dir); |
| |
| cmd->dma_size = scsi_use_sg; |
| cmd->sge_buffer = sgpnt; |
| |
| /* use page tables (s/g) */ |
| orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1); |
| orb->data_descriptor_lo = cmd->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++; |
| } |
| } |
| |
| orb->misc |= ORB_SET_DATA_SIZE(sg_count); |
| |
| 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 sbp2_fwhost_info *hi, |
| struct sbp2_command_info *cmd, |
| struct scatterlist *sgpnt, |
| u32 orb_direction, |
| unsigned int scsi_request_bufflen, |
| void *scsi_request_buffer, |
| enum dma_data_direction dma_dir) |
| { |
| cmd->dma_dir = dma_dir; |
| cmd->dma_size = scsi_request_bufflen; |
| cmd->dma_type = CMD_DMA_SINGLE; |
| cmd->cmd_dma = dma_map_single(hi->host->device.parent, |
| scsi_request_buffer, |
| cmd->dma_size, cmd->dma_dir); |
| orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id); |
| orb->misc |= ORB_SET_DIRECTION(orb_direction); |
| |
| /* 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 = cmd->cmd_dma; |
| orb->misc |= ORB_SET_DATA_SIZE(scsi_request_bufflen); |
| |
| } else { |
| /* The buffer is too large. Turn this into page tables. */ |
| |
| struct sbp2_unrestricted_page_table *sg_element = |
| &cmd->scatter_gather_element[0]; |
| u32 sg_count, sg_len; |
| dma_addr_t sg_addr; |
| |
| orb->data_descriptor_lo = cmd->sge_dma; |
| orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1); |
| |
| /* fill out our SBP-2 page tables; split up the large buffer */ |
| sg_count = 0; |
| sg_len = scsi_request_bufflen; |
| sg_addr = cmd->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++; |
| } |
| |
| orb->misc |= ORB_SET_DATA_SIZE(sg_count); |
| |
| sbp2util_cpu_to_be32_buffer(sg_element, |
| (sizeof(struct sbp2_unrestricted_page_table)) * |
| sg_count); |
| } |
| } |
| |
| static void sbp2_create_command_orb(struct sbp2_lu *lu, |
| struct sbp2_command_info *cmd, |
| unchar *scsi_cmd, |
| unsigned int scsi_use_sg, |
| unsigned int scsi_request_bufflen, |
| void *scsi_request_buffer, |
| enum dma_data_direction dma_dir) |
| { |
| struct sbp2_fwhost_info *hi = lu->hi; |
| struct scatterlist *sgpnt = (struct scatterlist *)scsi_request_buffer; |
| struct sbp2_command_orb *orb = &cmd->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). |
| */ |
| orb->next_ORB_hi = ORB_SET_NULL_PTR(1); |
| orb->next_ORB_lo = 0x0; |
| orb->misc = ORB_SET_MAX_PAYLOAD(lu->max_payload_size); |
| orb->misc |= ORB_SET_SPEED(lu->speed_code); |
| orb->misc |= ORB_SET_NOTIFY(1); |
| |
| 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_INFO("Falling back to DMA_NONE"); |
| orb_direction = ORB_DIRECTION_NO_DATA_TRANSFER; |
| } |
| |
| /* set up our page table stuff */ |
| if (orb_direction == ORB_DIRECTION_NO_DATA_TRANSFER) { |
| orb->data_descriptor_hi = 0x0; |
| orb->data_descriptor_lo = 0x0; |
| orb->misc |= ORB_SET_DIRECTION(1); |
| } else if (scsi_use_sg) |
| sbp2_prep_command_orb_sg(orb, hi, cmd, scsi_use_sg, sgpnt, |
| orb_direction, dma_dir); |
| else |
| sbp2_prep_command_orb_no_sg(orb, hi, cmd, sgpnt, orb_direction, |
| scsi_request_bufflen, |
| scsi_request_buffer, dma_dir); |
| |
| sbp2util_cpu_to_be32_buffer(orb, sizeof(*orb)); |
| |
| memset(orb->cdb, 0, 12); |
| memcpy(orb->cdb, scsi_cmd, COMMAND_SIZE(*scsi_cmd)); |
| } |
| |
| static void sbp2_link_orb_command(struct sbp2_lu *lu, |
| struct sbp2_command_info *cmd) |
| { |
| struct sbp2_fwhost_info *hi = lu->hi; |
| struct sbp2_command_orb *last_orb; |
| dma_addr_t last_orb_dma; |
| u64 addr = lu->command_block_agent_addr; |
| quadlet_t data[2]; |
| size_t length; |
| unsigned long flags; |
| |
| dma_sync_single_for_device(hi->host->device.parent, |
| cmd->command_orb_dma, |
| sizeof(struct sbp2_command_orb), |
| DMA_TO_DEVICE); |
| dma_sync_single_for_device(hi->host->device.parent, cmd->sge_dma, |
| sizeof(cmd->scatter_gather_element), |
| DMA_TO_DEVICE); |
| |
| /* check to see if there are any previous orbs to use */ |
| spin_lock_irqsave(&lu->cmd_orb_lock, flags); |
| last_orb = lu->last_orb; |
| last_orb_dma = lu->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] = cmd->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. |
| */ |
| dma_sync_single_for_cpu(hi->host->device.parent, last_orb_dma, |
| sizeof(struct sbp2_command_orb), |
| DMA_TO_DEVICE); |
| last_orb->next_ORB_lo = cpu_to_be32(cmd->command_orb_dma); |
| wmb(); |
| /* Tells hardware that this pointer is valid */ |
| last_orb->next_ORB_hi = 0; |
| dma_sync_single_for_device(hi->host->device.parent, |
| last_orb_dma, |
| sizeof(struct sbp2_command_orb), |
| DMA_TO_DEVICE); |
| addr += SBP2_DOORBELL_OFFSET; |
| data[0] = 0; |
| length = 4; |
| } |
| lu->last_orb = &cmd->command_orb; |
| lu->last_orb_dma = cmd->command_orb_dma; |
| spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); |
| |
| if (sbp2util_node_write_no_wait(lu->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(lu->shost); |
| PREPARE_WORK(&lu->protocol_work, |
| last_orb ? sbp2util_write_doorbell: |
| sbp2util_write_orb_pointer); |
| schedule_work(&lu->protocol_work); |
| } |
| } |
| |
| static int sbp2_send_command(struct sbp2_lu *lu, struct scsi_cmnd *SCpnt, |
| void (*done)(struct scsi_cmnd *)) |
| { |
| unchar *scsi_cmd = (unchar *)SCpnt->cmnd; |
| unsigned int request_bufflen = SCpnt->request_bufflen; |
| struct sbp2_command_info *cmd; |
| |
| cmd = sbp2util_allocate_command_orb(lu, SCpnt, done); |
| if (!cmd) |
| return -EIO; |
| |
| sbp2_create_command_orb(lu, cmd, scsi_cmd, SCpnt->use_sg, |
| request_bufflen, SCpnt->request_buffer, |
| SCpnt->sc_data_direction); |
| sbp2_link_orb_command(lu, cmd); |
| |
| 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) |
| { |
| /* 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; |
| } |
| |
| 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 sbp2_fwhost_info *hi; |
| struct sbp2_lu *lu = NULL, *lu_tmp; |
| struct scsi_cmnd *SCpnt = NULL; |
| struct sbp2_status_block *sb; |
| u32 scsi_status = SBP2_SCSI_STATUS_GOOD; |
| struct sbp2_command_info *cmd; |
| unsigned long flags; |
| |
| 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 the unit which wrote the status. */ |
| list_for_each_entry(lu_tmp, &hi->logical_units, lu_list) { |
| if (lu_tmp->ne->nodeid == nodeid && |
| lu_tmp->status_fifo_addr == addr) { |
| lu = lu_tmp; |
| break; |
| } |
| } |
| if (unlikely(!lu)) { |
| SBP2_ERR("lu is NULL - device is gone?"); |
| return RCODE_ADDRESS_ERROR; |
| } |
| |
| /* Put response into lu 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 = &lu->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)) |
| cmd = NULL; |
| else |
| cmd = sbp2util_find_command_for_orb(lu, sb->ORB_offset_lo); |
| if (cmd) { |
| dma_sync_single_for_cpu(hi->host->device.parent, |
| cmd->command_orb_dma, |
| sizeof(struct sbp2_command_orb), |
| DMA_TO_DEVICE); |
| dma_sync_single_for_cpu(hi->host->device.parent, cmd->sge_dma, |
| sizeof(cmd->scatter_gather_element), |
| DMA_TO_DEVICE); |
| /* 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 = cmd->Current_SCpnt; |
| spin_lock_irqsave(&lu->cmd_orb_lock, flags); |
| sbp2util_mark_command_completed(lu, cmd); |
| spin_unlock_irqrestore(&lu->cmd_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_INFO("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; |
| } |
| |
| if (STATUS_GET_LEN(h) > 1) |
| scsi_status = sbp2_status_to_sense_data( |
| (unchar *)sb, SCpnt->sense_buffer); |
| |
| if (STATUS_TEST_DEAD(h)) |
| sbp2_agent_reset(lu, 0); |
| } |
| |
| /* 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(&lu->cmd_orb_lock, flags); |
| if (list_empty(&lu->cmd_orb_inuse)) |
| lu->last_orb = NULL; |
| spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); |
| |
| } else { |
| /* It's probably status after a management request. */ |
| if ((sb->ORB_offset_lo == lu->reconnect_orb_dma) || |
| (sb->ORB_offset_lo == lu->login_orb_dma) || |
| (sb->ORB_offset_lo == lu->query_logins_orb_dma) || |
| (sb->ORB_offset_lo == lu->logout_orb_dma)) { |
| lu->access_complete = 1; |
| wake_up_interruptible(&sbp2_access_wq); |
| } |
| } |
| |
| if (SCpnt) |
| sbp2scsi_complete_command(lu, scsi_status, SCpnt, |
| cmd->Current_done); |
| return RCODE_COMPLETE; |
| } |
| |
| /************************************** |
| * SCSI interface related section |
| **************************************/ |
| |
| static int sbp2scsi_queuecommand(struct scsi_cmnd *SCpnt, |
| void (*done)(struct scsi_cmnd *)) |
| { |
| struct sbp2_lu *lu = (struct sbp2_lu *)SCpnt->device->host->hostdata[0]; |
| struct sbp2_fwhost_info *hi; |
| int result = DID_NO_CONNECT << 16; |
| |
| if (unlikely(!sbp2util_node_is_available(lu))) |
| goto done; |
| |
| hi = lu->hi; |
| |
| if (unlikely(!hi)) { |
| SBP2_ERR("sbp2_fwhost_info is NULL - this is bad!"); |
| goto done; |
| } |
| |
| /* Multiple units are currently represented to the SCSI core as separate |
| * targets, not as one target with multiple LUs. Therefore return |
| * selection time-out to any IO directed at non-zero LUNs. */ |
| if (unlikely(SCpnt->device->lun)) |
| goto done; |
| |
| if (unlikely(!hpsb_node_entry_valid(lu->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 (unlikely(SCpnt->sc_data_direction == DMA_BIDIRECTIONAL)) { |
| SBP2_ERR("Cannot handle DMA_BIDIRECTIONAL - rejecting command"); |
| result = DID_ERROR << 16; |
| goto done; |
| } |
| |
| if (sbp2_send_command(lu, SCpnt, done)) { |
| SBP2_ERR("Error sending SCSI command"); |
| sbp2scsi_complete_command(lu, |
| SBP2_SCSI_STATUS_SELECTION_TIMEOUT, |
| SCpnt, done); |
| } |
| return 0; |
| |
| done: |
| SCpnt->result = result; |
| done(SCpnt); |
| return 0; |
| } |
| |
| static void sbp2scsi_complete_all_commands(struct sbp2_lu *lu, u32 status) |
| { |
| struct sbp2_fwhost_info *hi = lu->hi; |
| struct list_head *lh; |
| struct sbp2_command_info *cmd; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&lu->cmd_orb_lock, flags); |
| while (!list_empty(&lu->cmd_orb_inuse)) { |
| lh = lu->cmd_orb_inuse.next; |
| cmd = list_entry(lh, struct sbp2_command_info, list); |
| dma_sync_single_for_cpu(hi->host->device.parent, |
| cmd->command_orb_dma, |
| sizeof(struct sbp2_command_orb), |
| DMA_TO_DEVICE); |
| dma_sync_single_for_cpu(hi->host->device.parent, cmd->sge_dma, |
| sizeof(cmd->scatter_gather_element), |
| DMA_TO_DEVICE); |
| sbp2util_mark_command_completed(lu, cmd); |
| if (cmd->Current_SCpnt) { |
| cmd->Current_SCpnt->result = status << 16; |
| cmd->Current_done(cmd->Current_SCpnt); |
| } |
| } |
| spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); |
| |
| return; |
| } |
| |
| /* |
| * Complete a regular SCSI command. Can be called in atomic context. |
| */ |
| static void sbp2scsi_complete_command(struct sbp2_lu *lu, u32 scsi_status, |
| struct scsi_cmnd *SCpnt, |
| void (*done)(struct scsi_cmnd *)) |
| { |
| if (!SCpnt) { |
| SBP2_ERR("SCpnt is NULL"); |
| return; |
| } |
| |
| 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: |
| SCpnt->result = CHECK_CONDITION << 1 | DID_OK << 16; |
| 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(lu->ne) |
| && (scsi_status != SBP2_SCSI_STATUS_GOOD)) { |
| SBP2_ERR("Completing command with busy (bus reset)"); |
| SCpnt->result = DID_BUS_BUSY << 16; |
| } |
| |
| /* Tell the SCSI stack that we're done with this command. */ |
| done(SCpnt); |
| } |
| |
| static int sbp2scsi_slave_alloc(struct scsi_device *sdev) |
| { |
| struct sbp2_lu *lu = (struct sbp2_lu *)sdev->host->hostdata[0]; |
| |
| lu->sdev = sdev; |
| sdev->allow_restart = 1; |
| |
| if (lu->workarounds & SBP2_WORKAROUND_INQUIRY_36) |
| sdev->inquiry_len = 36; |
| return 0; |
| } |
| |
| static int sbp2scsi_slave_configure(struct scsi_device *sdev) |
| { |
| struct sbp2_lu *lu = (struct sbp2_lu *)sdev->host->hostdata[0]; |
| |
| sdev->use_10_for_rw = 1; |
| |
| if (sdev->type == TYPE_ROM) |
| sdev->use_10_for_ms = 1; |
| if (sdev->type == TYPE_DISK && |
| lu->workarounds & SBP2_WORKAROUND_MODE_SENSE_8) |
| sdev->skip_ms_page_8 = 1; |
| if (lu->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) |
| sdev->fix_capacity = 1; |
| return 0; |
| } |
| |
| static void sbp2scsi_slave_destroy(struct scsi_device *sdev) |
| { |
| ((struct sbp2_lu *)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 sbp2_lu *lu = (struct sbp2_lu *)SCpnt->device->host->hostdata[0]; |
| struct sbp2_fwhost_info *hi = lu->hi; |
| struct sbp2_command_info *cmd; |
| unsigned long flags; |
| |
| SBP2_INFO("aborting sbp2 command"); |
| scsi_print_command(SCpnt); |
| |
| if (sbp2util_node_is_available(lu)) { |
| sbp2_agent_reset(lu, 1); |
| |
| /* Return a matching command structure to the free pool. */ |
| spin_lock_irqsave(&lu->cmd_orb_lock, flags); |
| cmd = sbp2util_find_command_for_SCpnt(lu, SCpnt); |
| if (cmd) { |
| dma_sync_single_for_cpu(hi->host->device.parent, |
| cmd->command_orb_dma, |
| sizeof(struct sbp2_command_orb), |
| DMA_TO_DEVICE); |
| dma_sync_single_for_cpu(hi->host->device.parent, |
| cmd->sge_dma, |
| sizeof(cmd->scatter_gather_element), |
| DMA_TO_DEVICE); |
| sbp2util_mark_command_completed(lu, cmd); |
| if (cmd->Current_SCpnt) { |
| cmd->Current_SCpnt->result = DID_ABORT << 16; |
| cmd->Current_done(cmd->Current_SCpnt); |
| } |
| } |
| spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); |
| |
| sbp2scsi_complete_all_commands(lu, DID_BUS_BUSY); |
| } |
| |
| return SUCCESS; |
| } |
| |
| /* |
| * Called by scsi stack when something has really gone wrong. |
| */ |
| static int sbp2scsi_reset(struct scsi_cmnd *SCpnt) |
| { |
| struct sbp2_lu *lu = (struct sbp2_lu *)SCpnt->device->host->hostdata[0]; |
| |
| SBP2_INFO("reset requested"); |
| |
| if (sbp2util_node_is_available(lu)) { |
| SBP2_INFO("generating sbp2 fetch agent reset"); |
| sbp2_agent_reset(lu, 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 sbp2_lu *lu; |
| |
| if (!(sdev = to_scsi_device(dev))) |
| return 0; |
| |
| if (!(lu = (struct sbp2_lu *)sdev->host->hostdata[0])) |
| return 0; |
| |
| if (sbp2_long_sysfs_ieee1394_id) |
| return sprintf(buf, "%016Lx:%06x:%04x\n", |
| (unsigned long long)lu->ne->guid, |
| lu->ud->directory_id, ORB_SET_LUN(lu->lun)); |
| else |
| return sprintf(buf, "%016Lx:%d:%d\n", |
| (unsigned long long)lu->ne->guid, |
| lu->ud->id, ORB_SET_LUN(lu->lun)); |
| } |
| |
| MODULE_AUTHOR("Ben Collins <bcollins@debian.org>"); |
| MODULE_DESCRIPTION("IEEE-1394 SBP-2 protocol driver"); |
| MODULE_SUPPORTED_DEVICE(SBP2_DEVICE_NAME); |
| MODULE_LICENSE("GPL"); |
| |
| static int sbp2_module_init(void) |
| { |
| int ret; |
| |
| if (sbp2_serialize_io) { |
| sbp2_shost_template.can_queue = 1; |
| sbp2_shost_template.cmd_per_lun = 1; |
| } |
| |
| if (sbp2_default_workarounds & SBP2_WORKAROUND_128K_MAX_TRANS && |
| (sbp2_max_sectors * 512) > (128 * 1024)) |
| sbp2_max_sectors = 128 * 1024 / 512; |
| sbp2_shost_template.max_sectors = sbp2_max_sectors; |
| |
| 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) |
| { |
| hpsb_unregister_protocol(&sbp2_driver); |
| hpsb_unregister_highlevel(&sbp2_highlevel); |
| } |
| |
| module_init(sbp2_module_init); |
| module_exit(sbp2_module_exit); |