1/* 2 * sbp2.c - SBP-2 protocol driver for IEEE-1394 3 * 4 * Copyright (C) 2000 James Goodwin, Filanet Corporation (www.filanet.com) 5 * jamesg@filanet.com (JSG) 6 * 7 * Copyright (C) 2003 Ben Collins <bcollins@debian.org> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software Foundation, 21 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 22 */ 23 24 25#include <linux/compiler.h> 26#include <linux/delay.h> 27#include <linux/device.h> 28#include <linux/dma-mapping.h> 29#include <linux/gfp.h> 30#include <linux/init.h> 31#include <linux/kernel.h> 32#include <linux/list.h> 33#include <linux/mm.h> 34#include <linux/module.h> 35#include <linux/moduleparam.h> 36#include <linux/sched.h> 37#include <linux/slab.h> 38#include <linux/spinlock.h> 39#include <linux/stat.h> 40#include <linux/string.h> 41#include <linux/stringify.h> 42#include <linux/types.h> 43#include <linux/wait.h> 44#include <linux/workqueue.h> 45 46#include <asm/byteorder.h> 47#include <asm/errno.h> 48#include <asm/param.h> 49#include <asm/scatterlist.h> 50#include <asm/system.h> 51#include <asm/types.h> 52 53#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA 54#include <asm/io.h> /* for bus_to_virt */ 55#endif 56 57#include <scsi/scsi.h> 58#include <scsi/scsi_cmnd.h> 59#include <scsi/scsi_dbg.h> 60#include <scsi/scsi_device.h> 61#include <scsi/scsi_host.h> 62 63#include "csr1212.h" 64#include "highlevel.h" 65#include "hosts.h" 66#include "ieee1394.h" 67#include "ieee1394_core.h" 68#include "ieee1394_hotplug.h" 69#include "ieee1394_transactions.h" 70#include "ieee1394_types.h" 71#include "nodemgr.h" 72#include "sbp2.h" 73 74/* 75 * Module load parameter definitions 76 */ 77 78/* 79 * Change max_speed on module load if you have a bad IEEE-1394 80 * controller that has trouble running 2KB packets at 400mb. 81 * 82 * NOTE: On certain OHCI parts I have seen short packets on async transmit 83 * (probably due to PCI latency/throughput issues with the part). You can 84 * bump down the speed if you are running into problems. 85 */ 86static int sbp2_max_speed = IEEE1394_SPEED_MAX; 87module_param_named(max_speed, sbp2_max_speed, int, 0644); 88MODULE_PARM_DESC(max_speed, "Force max speed " 89 "(3 = 800Mb/s, 2 = 400Mb/s, 1 = 200Mb/s, 0 = 100Mb/s)"); 90 91/* 92 * Set serialize_io to 1 if you'd like only one scsi command sent 93 * down to us at a time (debugging). This might be necessary for very 94 * badly behaved sbp2 devices. 95 */ 96static int sbp2_serialize_io = 1; 97module_param_named(serialize_io, sbp2_serialize_io, int, 0444); 98MODULE_PARM_DESC(serialize_io, "Serialize I/O coming from scsi drivers " 99 "(default = 1, faster = 0)"); 100 101/* 102 * Bump up max_sectors if you'd like to support very large sized 103 * transfers. Please note that some older sbp2 bridge chips are broken for 104 * transfers greater or equal to 128KB. Default is a value of 255 105 * sectors, or just under 128KB (at 512 byte sector size). I can note that 106 * the Oxsemi sbp2 chipsets have no problems supporting very large 107 * transfer sizes. 108 */ 109static int sbp2_max_sectors = SBP2_MAX_SECTORS; 110module_param_named(max_sectors, sbp2_max_sectors, int, 0444); 111MODULE_PARM_DESC(max_sectors, "Change max sectors per I/O supported " 112 "(default = " __stringify(SBP2_MAX_SECTORS) ")"); 113 114/* 115 * Exclusive login to sbp2 device? In most cases, the sbp2 driver should 116 * do an exclusive login, as it's generally unsafe to have two hosts 117 * talking to a single sbp2 device at the same time (filesystem coherency, 118 * etc.). If you're running an sbp2 device that supports multiple logins, 119 * and you're either running read-only filesystems or some sort of special 120 * filesystem supporting multiple hosts, e.g. OpenGFS, Oracle Cluster 121 * File System, or Lustre, then set exclusive_login to zero. 122 * 123 * So far only bridges from Oxford Semiconductor are known to support 124 * concurrent logins. Depending on firmware, four or two concurrent logins 125 * are possible on OXFW911 and newer Oxsemi bridges. 126 */ 127static int sbp2_exclusive_login = 1; 128module_param_named(exclusive_login, sbp2_exclusive_login, int, 0644); 129MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device " 130 "(default = 1)"); 131 132/* 133 * If any of the following workarounds is required for your device to work, 134 * please submit the kernel messages logged by sbp2 to the linux1394-devel 135 * mailing list. 136 * 137 * - 128kB max transfer 138 * Limit transfer size. Necessary for some old bridges. 139 * 140 * - 36 byte inquiry 141 * When scsi_mod probes the device, let the inquiry command look like that 142 * from MS Windows. 143 * 144 * - skip mode page 8 145 * Suppress sending of mode_sense for mode page 8 if the device pretends to 146 * support the SCSI Primary Block commands instead of Reduced Block Commands. 147 * 148 * - fix capacity 149 * Tell sd_mod to correct the last sector number reported by read_capacity. 150 * Avoids access beyond actual disk limits on devices with an off-by-one bug. 151 * Don't use this with devices which don't have this bug. 152 * 153 * - override internal blacklist 154 * Instead of adding to the built-in blacklist, use only the workarounds 155 * specified in the module load parameter. 156 * Useful if a blacklist entry interfered with a non-broken device. 157 */ 158static int sbp2_default_workarounds; 159module_param_named(workarounds, sbp2_default_workarounds, int, 0644); 160MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0" 161 ", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS) 162 ", 36 byte inquiry = " __stringify(SBP2_WORKAROUND_INQUIRY_36) 163 ", skip mode page 8 = " __stringify(SBP2_WORKAROUND_MODE_SENSE_8) 164 ", fix capacity = " __stringify(SBP2_WORKAROUND_FIX_CAPACITY) 165 ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE) 166 ", or a combination)"); 167 168/* 169 * This influences the format of the sysfs attribute 170 * /sys/bus/scsi/devices/.../ieee1394_id. 171 * 172 * The default format is like in older kernels: %016Lx:%d:%d 173 * It contains the target's EUI-64, a number given to the logical unit by 174 * the ieee1394 driver's nodemgr (starting at 0), and the LUN. 175 * 176 * The long format is: %016Lx:%06x:%04x 177 * It contains the target's EUI-64, the unit directory's directory_ID as per 178 * IEEE 1212 clause 7.7.19, and the LUN. This format comes closest to the 179 * format of SBP(-3) target port and logical unit identifier as per SAM (SCSI 180 * Architecture Model) rev.2 to 4 annex A. Therefore and because it is 181 * independent of the implementation of the ieee1394 nodemgr, the longer format 182 * is recommended for future use. 183 */ 184static int sbp2_long_sysfs_ieee1394_id; 185module_param_named(long_ieee1394_id, sbp2_long_sysfs_ieee1394_id, bool, 0644); 186MODULE_PARM_DESC(long_ieee1394_id, "8+3+2 bytes format of ieee1394_id in sysfs " 187 "(default = backwards-compatible = N, SAM-conforming = Y)"); 188 189 190#define SBP2_INFO(fmt, args...) HPSB_INFO("sbp2: "fmt, ## args) 191#define SBP2_ERR(fmt, args...) HPSB_ERR("sbp2: "fmt, ## args) 192 193/* 194 * Globals 195 */ 196static void sbp2scsi_complete_all_commands(struct sbp2_lu *, u32); 197static void sbp2scsi_complete_command(struct sbp2_lu *, u32, struct scsi_cmnd *, 198 void (*)(struct scsi_cmnd *)); 199static struct sbp2_lu *sbp2_alloc_device(struct unit_directory *); 200static int sbp2_start_device(struct sbp2_lu *); 201static void sbp2_remove_device(struct sbp2_lu *); 202static int sbp2_login_device(struct sbp2_lu *); 203static int sbp2_reconnect_device(struct sbp2_lu *); 204static int sbp2_logout_device(struct sbp2_lu *); 205static void sbp2_host_reset(struct hpsb_host *); 206static int sbp2_handle_status_write(struct hpsb_host *, int, int, quadlet_t *, 207 u64, size_t, u16); 208static int sbp2_agent_reset(struct sbp2_lu *, int); 209static void sbp2_parse_unit_directory(struct sbp2_lu *, 210 struct unit_directory *); 211static int sbp2_set_busy_timeout(struct sbp2_lu *); 212static int sbp2_max_speed_and_size(struct sbp2_lu *); 213 214 215static const u8 sbp2_speedto_max_payload[] = { 0x7, 0x8, 0x9, 0xA, 0xB, 0xC }; 216 217static struct hpsb_highlevel sbp2_highlevel = { 218 .name = SBP2_DEVICE_NAME, 219 .host_reset = sbp2_host_reset, 220}; 221 222static struct hpsb_address_ops sbp2_ops = { 223 .write = sbp2_handle_status_write 224}; 225 226#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA 227static int sbp2_handle_physdma_write(struct hpsb_host *, int, int, quadlet_t *, 228 u64, size_t, u16); 229static int sbp2_handle_physdma_read(struct hpsb_host *, int, quadlet_t *, u64, 230 size_t, u16); 231 232static struct hpsb_address_ops sbp2_physdma_ops = { 233 .read = sbp2_handle_physdma_read, 234 .write = sbp2_handle_physdma_write, 235}; 236#endif 237 238 239/* 240 * Interface to driver core and IEEE 1394 core 241 */ 242static struct ieee1394_device_id sbp2_id_table[] = { 243 { 244 .match_flags = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION, 245 .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY & 0xffffff, 246 .version = SBP2_SW_VERSION_ENTRY & 0xffffff}, 247 {} 248}; 249MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table); 250 251static int sbp2_probe(struct device *); 252static int sbp2_remove(struct device *); 253static int sbp2_update(struct unit_directory *); 254 255static struct hpsb_protocol_driver sbp2_driver = { 256 .name = SBP2_DEVICE_NAME, 257 .id_table = sbp2_id_table, 258 .update = sbp2_update, 259 .driver = { 260 .probe = sbp2_probe, 261 .remove = sbp2_remove, 262 }, 263}; 264 265 266/* 267 * Interface to SCSI core 268 */ 269static int sbp2scsi_queuecommand(struct scsi_cmnd *, 270 void (*)(struct scsi_cmnd *)); 271static int sbp2scsi_abort(struct scsi_cmnd *); 272static int sbp2scsi_reset(struct scsi_cmnd *); 273static int sbp2scsi_slave_alloc(struct scsi_device *); 274static int sbp2scsi_slave_configure(struct scsi_device *); 275static void sbp2scsi_slave_destroy(struct scsi_device *); 276static ssize_t sbp2_sysfs_ieee1394_id_show(struct device *, 277 struct device_attribute *, char *); 278 279static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL); 280 281static struct device_attribute *sbp2_sysfs_sdev_attrs[] = { 282 &dev_attr_ieee1394_id, 283 NULL 284}; 285 286static struct scsi_host_template sbp2_shost_template = { 287 .module = THIS_MODULE, 288 .name = "SBP-2 IEEE-1394", 289 .proc_name = SBP2_DEVICE_NAME, 290 .queuecommand = sbp2scsi_queuecommand, 291 .eh_abort_handler = sbp2scsi_abort, 292 .eh_device_reset_handler = sbp2scsi_reset, 293 .slave_alloc = sbp2scsi_slave_alloc, 294 .slave_configure = sbp2scsi_slave_configure, 295 .slave_destroy = sbp2scsi_slave_destroy, 296 .this_id = -1, 297 .sg_tablesize = SG_ALL, 298 .use_clustering = ENABLE_CLUSTERING, 299 .cmd_per_lun = SBP2_MAX_CMDS, 300 .can_queue = SBP2_MAX_CMDS, 301 .sdev_attrs = sbp2_sysfs_sdev_attrs, 302}; 303 304/* for match-all entries in sbp2_workarounds_table */ 305#define SBP2_ROM_VALUE_WILDCARD 0x1000000 306 307/* 308 * List of devices with known bugs. 309 * 310 * The firmware_revision field, masked with 0xffff00, is the best indicator 311 * for the type of bridge chip of a device. It yields a few false positives 312 * but this did not break correctly behaving devices so far. 313 */ 314static const struct { 315 u32 firmware_revision; 316 u32 model_id; 317 unsigned workarounds; 318} sbp2_workarounds_table[] = { 319 /* DViCO Momobay CX-1 with TSB42AA9 bridge */ { 320 .firmware_revision = 0x002800, 321 .model_id = 0x001010, 322 .workarounds = SBP2_WORKAROUND_INQUIRY_36 | 323 SBP2_WORKAROUND_MODE_SENSE_8, 324 }, 325 /* Initio bridges, actually only needed for some older ones */ { 326 .firmware_revision = 0x000200, 327 .model_id = SBP2_ROM_VALUE_WILDCARD, 328 .workarounds = SBP2_WORKAROUND_INQUIRY_36, 329 }, 330 /* Symbios bridge */ { 331 .firmware_revision = 0xa0b800, 332 .model_id = SBP2_ROM_VALUE_WILDCARD, 333 .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, 334 }, 335 /* iPod 4th generation */ { 336 .firmware_revision = 0x0a2700, 337 .model_id = 0x000021, 338 .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, 339 }, 340 /* iPod mini */ { 341 .firmware_revision = 0x0a2700, 342 .model_id = 0x000023, 343 .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, 344 }, 345 /* iPod Photo */ { 346 .firmware_revision = 0x0a2700, 347 .model_id = 0x00007e, 348 .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, 349 } 350}; 351 352/************************************** 353 * General utility functions 354 **************************************/ 355 356#ifndef __BIG_ENDIAN 357/* 358 * Converts a buffer from be32 to cpu byte ordering. Length is in bytes. 359 */ 360static inline void sbp2util_be32_to_cpu_buffer(void *buffer, int length) 361{ 362 u32 *temp = buffer; 363 364 for (length = (length >> 2); length--; ) 365 temp[length] = be32_to_cpu(temp[length]); 366} 367 368/* 369 * Converts a buffer from cpu to be32 byte ordering. Length is in bytes. 370 */ 371static inline void sbp2util_cpu_to_be32_buffer(void *buffer, int length) 372{ 373 u32 *temp = buffer; 374 375 for (length = (length >> 2); length--; ) 376 temp[length] = cpu_to_be32(temp[length]); 377} 378#else /* BIG_ENDIAN */ 379/* Why waste the cpu cycles? */ 380#define sbp2util_be32_to_cpu_buffer(x,y) do {} while (0) 381#define sbp2util_cpu_to_be32_buffer(x,y) do {} while (0) 382#endif 383 384static DECLARE_WAIT_QUEUE_HEAD(sbp2_access_wq); 385 386/* 387 * Waits for completion of an SBP-2 access request. 388 * Returns nonzero if timed out or prematurely interrupted. 389 */ 390static int sbp2util_access_timeout(struct sbp2_lu *lu, int timeout) 391{ 392 long leftover; 393 394 leftover = wait_event_interruptible_timeout( 395 sbp2_access_wq, lu->access_complete, timeout); 396 lu->access_complete = 0; 397 return leftover <= 0; 398} 399 400static void sbp2_free_packet(void *packet) 401{ 402 hpsb_free_tlabel(packet); 403 hpsb_free_packet(packet); 404} 405 406/* 407 * This is much like hpsb_node_write(), except it ignores the response 408 * subaction and returns immediately. Can be used from atomic context. 409 */ 410static int sbp2util_node_write_no_wait(struct node_entry *ne, u64 addr, 411 quadlet_t *buf, size_t len) 412{ 413 struct hpsb_packet *packet; 414 415 packet = hpsb_make_writepacket(ne->host, ne->nodeid, addr, buf, len); 416 if (!packet) 417 return -ENOMEM; 418 419 hpsb_set_packet_complete_task(packet, sbp2_free_packet, packet); 420 hpsb_node_fill_packet(ne, packet); 421 if (hpsb_send_packet(packet) < 0) { 422 sbp2_free_packet(packet); 423 return -EIO; 424 } 425 return 0; 426} 427 428static void sbp2util_notify_fetch_agent(struct sbp2_lu *lu, u64 offset, 429 quadlet_t *data, size_t len) 430{ 431 /* There is a small window after a bus reset within which the node 432 * entry's generation is current but the reconnect wasn't completed. */ 433 if (unlikely(atomic_read(&lu->state) == SBP2LU_STATE_IN_RESET)) 434 return; 435 436 if (hpsb_node_write(lu->ne, lu->command_block_agent_addr + offset, 437 data, len)) 438 SBP2_ERR("sbp2util_notify_fetch_agent failed."); 439 440 /* Now accept new SCSI commands, unless a bus reset happended during 441 * hpsb_node_write. */ 442 if (likely(atomic_read(&lu->state) != SBP2LU_STATE_IN_RESET)) 443 scsi_unblock_requests(lu->shost); 444} 445 446static void sbp2util_write_orb_pointer(struct work_struct *work) 447{ 448 struct sbp2_lu *lu = container_of(work, struct sbp2_lu, protocol_work); 449 quadlet_t data[2]; 450 451 data[0] = ORB_SET_NODE_ID(lu->hi->host->node_id); 452 data[1] = lu->last_orb_dma; 453 sbp2util_cpu_to_be32_buffer(data, 8); 454 sbp2util_notify_fetch_agent(lu, SBP2_ORB_POINTER_OFFSET, data, 8); 455} 456 457static void sbp2util_write_doorbell(struct work_struct *work) 458{ 459 struct sbp2_lu *lu = container_of(work, struct sbp2_lu, protocol_work); 460 461 sbp2util_notify_fetch_agent(lu, SBP2_DOORBELL_OFFSET, NULL, 4); 462} 463 464static int sbp2util_create_command_orb_pool(struct sbp2_lu *lu) 465{ 466 struct sbp2_fwhost_info *hi = lu->hi; 467 struct sbp2_command_info *cmd; 468 int i, orbs = sbp2_serialize_io ? 2 : SBP2_MAX_CMDS; 469 470 for (i = 0; i < orbs; i++) { 471 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); 472 if (!cmd) 473 return -ENOMEM; 474 cmd->command_orb_dma = dma_map_single(hi->host->device.parent, 475 &cmd->command_orb, 476 sizeof(struct sbp2_command_orb), 477 DMA_TO_DEVICE); 478 cmd->sge_dma = dma_map_single(hi->host->device.parent, 479 &cmd->scatter_gather_element, 480 sizeof(cmd->scatter_gather_element), 481 DMA_TO_DEVICE); 482 INIT_LIST_HEAD(&cmd->list); 483 list_add_tail(&cmd->list, &lu->cmd_orb_completed); 484 } 485 return 0; 486} 487 488static void sbp2util_remove_command_orb_pool(struct sbp2_lu *lu) 489{ 490 struct hpsb_host *host = lu->hi->host; 491 struct list_head *lh, *next; 492 struct sbp2_command_info *cmd; 493 unsigned long flags; 494 495 spin_lock_irqsave(&lu->cmd_orb_lock, flags); 496 if (!list_empty(&lu->cmd_orb_completed)) 497 list_for_each_safe(lh, next, &lu->cmd_orb_completed) { 498 cmd = list_entry(lh, struct sbp2_command_info, list); 499 dma_unmap_single(host->device.parent, 500 cmd->command_orb_dma, 501 sizeof(struct sbp2_command_orb), 502 DMA_TO_DEVICE); 503 dma_unmap_single(host->device.parent, cmd->sge_dma, 504 sizeof(cmd->scatter_gather_element), 505 DMA_TO_DEVICE); 506 kfree(cmd); 507 } 508 spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); 509 return; 510} 511 512/* 513 * Finds the sbp2_command for a given outstanding command ORB. 514 * Only looks at the in-use list. 515 */ 516static struct sbp2_command_info *sbp2util_find_command_for_orb( 517 struct sbp2_lu *lu, dma_addr_t orb) 518{ 519 struct sbp2_command_info *cmd; 520 unsigned long flags; 521 522 spin_lock_irqsave(&lu->cmd_orb_lock, flags); 523 if (!list_empty(&lu->cmd_orb_inuse)) 524 list_for_each_entry(cmd, &lu->cmd_orb_inuse, list) 525 if (cmd->command_orb_dma == orb) { 526 spin_unlock_irqrestore( 527 &lu->cmd_orb_lock, flags); 528 return cmd; 529 } 530 spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); 531 return NULL; 532} 533 534/* 535 * Finds the sbp2_command for a given outstanding SCpnt. 536 * Only looks at the in-use list. 537 * Must be called with lu->cmd_orb_lock held. 538 */ 539static struct sbp2_command_info *sbp2util_find_command_for_SCpnt( 540 struct sbp2_lu *lu, void *SCpnt) 541{ 542 struct sbp2_command_info *cmd; 543 544 if (!list_empty(&lu->cmd_orb_inuse)) 545 list_for_each_entry(cmd, &lu->cmd_orb_inuse, list) 546 if (cmd->Current_SCpnt == SCpnt) 547 return cmd; 548 return NULL; 549} 550 551static struct sbp2_command_info *sbp2util_allocate_command_orb( 552 struct sbp2_lu *lu, 553 struct scsi_cmnd *Current_SCpnt, 554 void (*Current_done)(struct scsi_cmnd *)) 555{ 556 struct list_head *lh; 557 struct sbp2_command_info *cmd = NULL; 558 unsigned long flags; 559 560 spin_lock_irqsave(&lu->cmd_orb_lock, flags); 561 if (!list_empty(&lu->cmd_orb_completed)) { 562 lh = lu->cmd_orb_completed.next; 563 list_del(lh); 564 cmd = list_entry(lh, struct sbp2_command_info, list); 565 cmd->Current_done = Current_done; 566 cmd->Current_SCpnt = Current_SCpnt; 567 list_add_tail(&cmd->list, &lu->cmd_orb_inuse); 568 } else 569 SBP2_ERR("%s: no orbs available", __FUNCTION__); 570 spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); 571 return cmd; 572} 573 574/* 575 * Unmaps the DMAs of a command and moves the command to the completed ORB list. 576 * Must be called with lu->cmd_orb_lock held. 577 */ 578static void sbp2util_mark_command_completed(struct sbp2_lu *lu, 579 struct sbp2_command_info *cmd) 580{ 581 struct hpsb_host *host = lu->ud->ne->host; 582 583 if (cmd->cmd_dma) { 584 if (cmd->dma_type == CMD_DMA_SINGLE) 585 dma_unmap_single(host->device.parent, cmd->cmd_dma, 586 cmd->dma_size, cmd->dma_dir); 587 else if (cmd->dma_type == CMD_DMA_PAGE) 588 dma_unmap_page(host->device.parent, cmd->cmd_dma, 589 cmd->dma_size, cmd->dma_dir); 590 cmd->dma_type = CMD_DMA_NONE; 591 cmd->cmd_dma = 0; 592 } 593 if (cmd->sge_buffer) { 594 dma_unmap_sg(host->device.parent, cmd->sge_buffer, 595 cmd->dma_size, cmd->dma_dir); 596 cmd->sge_buffer = NULL; 597 } 598 list_move_tail(&cmd->list, &lu->cmd_orb_completed); 599} 600 601/* 602 * Is lu valid? Is the 1394 node still present? 603 */ 604static inline int sbp2util_node_is_available(struct sbp2_lu *lu) 605{ 606 return lu && lu->ne && !lu->ne->in_limbo; 607} 608 609/********************************************* 610 * IEEE-1394 core driver stack related section 611 *********************************************/ 612 613static int sbp2_probe(struct device *dev) 614{ 615 struct unit_directory *ud; 616 struct sbp2_lu *lu; 617 618 ud = container_of(dev, struct unit_directory, device); 619 620 /* Don't probe UD's that have the LUN flag. We'll probe the LUN(s) 621 * instead. */ 622 if (ud->flags & UNIT_DIRECTORY_HAS_LUN_DIRECTORY) 623 return -ENODEV; 624 625 lu = sbp2_alloc_device(ud); 626 if (!lu) 627 return -ENOMEM; 628 629 sbp2_parse_unit_directory(lu, ud); 630 return sbp2_start_device(lu); 631} 632 633static int sbp2_remove(struct device *dev) 634{ 635 struct unit_directory *ud; 636 struct sbp2_lu *lu; 637 struct scsi_device *sdev; 638 639 ud = container_of(dev, struct unit_directory, device); 640 lu = ud->device.driver_data; 641 if (!lu) 642 return 0; 643 644 if (lu->shost) { 645 /* Get rid of enqueued commands if there is no chance to 646 * send them. */ 647 if (!sbp2util_node_is_available(lu)) 648 sbp2scsi_complete_all_commands(lu, DID_NO_CONNECT); 649 /* scsi_remove_device() may trigger shutdown functions of SCSI 650 * highlevel drivers which would deadlock if blocked. */ 651 atomic_set(&lu->state, SBP2LU_STATE_IN_SHUTDOWN); 652 scsi_unblock_requests(lu->shost); 653 } 654 sdev = lu->sdev; 655 if (sdev) { 656 lu->sdev = NULL; 657 scsi_remove_device(sdev); 658 } 659 660 sbp2_logout_device(lu); 661 sbp2_remove_device(lu); 662 663 return 0; 664} 665 666static int sbp2_update(struct unit_directory *ud) 667{ 668 struct sbp2_lu *lu = ud->device.driver_data; 669 670 if (sbp2_reconnect_device(lu)) { 671 /* Reconnect has failed. Perhaps we didn't reconnect fast 672 * enough. Try a regular login, but first log out just in 673 * case of any weirdness. */ 674 sbp2_logout_device(lu); 675 676 if (sbp2_login_device(lu)) { 677 /* Login failed too, just fail, and the backend 678 * will call our sbp2_remove for us */ 679 SBP2_ERR("Failed to reconnect to sbp2 device!"); 680 return -EBUSY; 681 } 682 } 683 684 sbp2_set_busy_timeout(lu); 685 sbp2_agent_reset(lu, 1); 686 sbp2_max_speed_and_size(lu); 687 688 /* Complete any pending commands with busy (so they get retried) 689 * and remove them from our queue. */ 690 sbp2scsi_complete_all_commands(lu, DID_BUS_BUSY); 691 692 /* Accept new commands unless there was another bus reset in the 693 * meantime. */ 694 if (hpsb_node_entry_valid(lu->ne)) { 695 atomic_set(&lu->state, SBP2LU_STATE_RUNNING); 696 scsi_unblock_requests(lu->shost); 697 } 698 return 0; 699} 700 701static struct sbp2_lu *sbp2_alloc_device(struct unit_directory *ud) 702{ 703 struct sbp2_fwhost_info *hi; 704 struct Scsi_Host *shost = NULL; 705 struct sbp2_lu *lu = NULL; 706 707 lu = kzalloc(sizeof(*lu), GFP_KERNEL); 708 if (!lu) { 709 SBP2_ERR("failed to create lu"); 710 goto failed_alloc; 711 } 712 713 lu->ne = ud->ne; 714 lu->ud = ud; 715 lu->speed_code = IEEE1394_SPEED_100; 716 lu->max_payload_size = sbp2_speedto_max_payload[IEEE1394_SPEED_100]; 717 lu->status_fifo_addr = CSR1212_INVALID_ADDR_SPACE; 718 INIT_LIST_HEAD(&lu->cmd_orb_inuse); 719 INIT_LIST_HEAD(&lu->cmd_orb_completed); 720 INIT_LIST_HEAD(&lu->lu_list); 721 spin_lock_init(&lu->cmd_orb_lock); 722 atomic_set(&lu->state, SBP2LU_STATE_RUNNING); 723 INIT_WORK(&lu->protocol_work, NULL); 724 725 ud->device.driver_data = lu; 726 727 hi = hpsb_get_hostinfo(&sbp2_highlevel, ud->ne->host); 728 if (!hi) { 729 hi = hpsb_create_hostinfo(&sbp2_highlevel, ud->ne->host, 730 sizeof(*hi)); 731 if (!hi) { 732 SBP2_ERR("failed to allocate hostinfo"); 733 goto failed_alloc; 734 } 735 hi->host = ud->ne->host; 736 INIT_LIST_HEAD(&hi->logical_units); 737 738#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA 739 /* Handle data movement if physical dma is not 740 * enabled or not supported on host controller */ 741 if (!hpsb_register_addrspace(&sbp2_highlevel, ud->ne->host, 742 &sbp2_physdma_ops, 743 0x0ULL, 0xfffffffcULL)) { 744 SBP2_ERR("failed to register lower 4GB address range"); 745 goto failed_alloc; 746 } 747#else 748 if (dma_set_mask(hi->host->device.parent, DMA_32BIT_MASK)) { 749 SBP2_ERR("failed to set 4GB DMA mask"); 750 goto failed_alloc; 751 } 752#endif 753 } 754 755 /* Prevent unloading of the 1394 host */ 756 if (!try_module_get(hi->host->driver->owner)) { 757 SBP2_ERR("failed to get a reference on 1394 host driver"); 758 goto failed_alloc; 759 } 760 761 lu->hi = hi; 762 763 list_add_tail(&lu->lu_list, &hi->logical_units); 764 765 /* Register the status FIFO address range. We could use the same FIFO 766 * for targets at different nodes. However we need different FIFOs per 767 * target in order to support multi-unit devices. 768 * The FIFO is located out of the local host controller's physical range 769 * but, if possible, within the posted write area. Status writes will 770 * then be performed as unified transactions. This slightly reduces 771 * bandwidth usage, and some Prolific based devices seem to require it. 772 */ 773 lu->status_fifo_addr = hpsb_allocate_and_register_addrspace( 774 &sbp2_highlevel, ud->ne->host, &sbp2_ops, 775 sizeof(struct sbp2_status_block), sizeof(quadlet_t), 776 ud->ne->host->low_addr_space, CSR1212_ALL_SPACE_END); 777 if (lu->status_fifo_addr == CSR1212_INVALID_ADDR_SPACE) { 778 SBP2_ERR("failed to allocate status FIFO address range"); 779 goto failed_alloc; 780 } 781 782 shost = scsi_host_alloc(&sbp2_shost_template, sizeof(unsigned long)); 783 if (!shost) { 784 SBP2_ERR("failed to register scsi host"); 785 goto failed_alloc; 786 } 787 788 shost->hostdata[0] = (unsigned long)lu; 789 790 if (!scsi_add_host(shost, &ud->device)) { 791 lu->shost = shost; 792 return lu; 793 } 794 795 SBP2_ERR("failed to add scsi host"); 796 scsi_host_put(shost); 797 798failed_alloc: 799 sbp2_remove_device(lu); 800 return NULL; 801} 802 803static void sbp2_host_reset(struct hpsb_host *host) 804{ 805 struct sbp2_fwhost_info *hi; 806 struct sbp2_lu *lu; 807 808 hi = hpsb_get_hostinfo(&sbp2_highlevel, host); 809 if (!hi) 810 return; 811 list_for_each_entry(lu, &hi->logical_units, lu_list) 812 if (likely(atomic_read(&lu->state) != 813 SBP2LU_STATE_IN_SHUTDOWN)) { 814 atomic_set(&lu->state, SBP2LU_STATE_IN_RESET); 815 scsi_block_requests(lu->shost); 816 } 817} 818 819static int sbp2_start_device(struct sbp2_lu *lu) 820{ 821 struct sbp2_fwhost_info *hi = lu->hi; 822 int error; 823 824 lu->login_response = dma_alloc_coherent(hi->host->device.parent, 825 sizeof(struct sbp2_login_response), 826 &lu->login_response_dma, GFP_KERNEL); 827 if (!lu->login_response) 828 goto alloc_fail; 829 830 lu->query_logins_orb = dma_alloc_coherent(hi->host->device.parent, 831 sizeof(struct sbp2_query_logins_orb), 832 &lu->query_logins_orb_dma, GFP_KERNEL); 833 if (!lu->query_logins_orb) 834 goto alloc_fail; 835 836 lu->query_logins_response = dma_alloc_coherent(hi->host->device.parent, 837 sizeof(struct sbp2_query_logins_response), 838 &lu->query_logins_response_dma, GFP_KERNEL); 839 if (!lu->query_logins_response) 840 goto alloc_fail; 841 842 lu->reconnect_orb = dma_alloc_coherent(hi->host->device.parent, 843 sizeof(struct sbp2_reconnect_orb), 844 &lu->reconnect_orb_dma, GFP_KERNEL); 845 if (!lu->reconnect_orb) 846 goto alloc_fail; 847 848 lu->logout_orb = dma_alloc_coherent(hi->host->device.parent, 849 sizeof(struct sbp2_logout_orb), 850 &lu->logout_orb_dma, GFP_KERNEL); 851 if (!lu->logout_orb) 852 goto alloc_fail; 853 854 lu->login_orb = dma_alloc_coherent(hi->host->device.parent, 855 sizeof(struct sbp2_login_orb), 856 &lu->login_orb_dma, GFP_KERNEL); 857 if (!lu->login_orb) 858 goto alloc_fail; 859 860 if (sbp2util_create_command_orb_pool(lu)) 861 goto alloc_fail; 862 863 /* Wait a second before trying to log in. Previously logged in 864 * initiators need a chance to reconnect. */ 865 if (msleep_interruptible(1000)) { 866 sbp2_remove_device(lu); 867 return -EINTR; 868 } 869 870 if (sbp2_login_device(lu)) { 871 sbp2_remove_device(lu); 872 return -EBUSY; 873 } 874 875 sbp2_set_busy_timeout(lu); 876 sbp2_agent_reset(lu, 1); 877 sbp2_max_speed_and_size(lu); 878 879 error = scsi_add_device(lu->shost, 0, lu->ud->id, 0); 880 if (error) { 881 SBP2_ERR("scsi_add_device failed"); 882 sbp2_logout_device(lu); 883 sbp2_remove_device(lu); 884 return error; 885 } 886 887 return 0; 888 889alloc_fail: 890 SBP2_ERR("Could not allocate memory for lu"); 891 sbp2_remove_device(lu); 892 return -ENOMEM; 893} 894 895static void sbp2_remove_device(struct sbp2_lu *lu) 896{ 897 struct sbp2_fwhost_info *hi; 898 899 if (!lu) 900 return; 901 902 hi = lu->hi; 903 904 if (lu->shost) { 905 scsi_remove_host(lu->shost); 906 scsi_host_put(lu->shost); 907 } 908 flush_scheduled_work(); 909 sbp2util_remove_command_orb_pool(lu); 910 911 list_del(&lu->lu_list); 912 913 if (lu->login_response) 914 dma_free_coherent(hi->host->device.parent, 915 sizeof(struct sbp2_login_response), 916 lu->login_response, 917 lu->login_response_dma); 918 if (lu->login_orb) 919 dma_free_coherent(hi->host->device.parent, 920 sizeof(struct sbp2_login_orb), 921 lu->login_orb, 922 lu->login_orb_dma); 923 if (lu->reconnect_orb) 924 dma_free_coherent(hi->host->device.parent, 925 sizeof(struct sbp2_reconnect_orb), 926 lu->reconnect_orb, 927 lu->reconnect_orb_dma); 928 if (lu->logout_orb) 929 dma_free_coherent(hi->host->device.parent, 930 sizeof(struct sbp2_logout_orb), 931 lu->logout_orb, 932 lu->logout_orb_dma); 933 if (lu->query_logins_orb) 934 dma_free_coherent(hi->host->device.parent, 935 sizeof(struct sbp2_query_logins_orb), 936 lu->query_logins_orb, 937 lu->query_logins_orb_dma); 938 if (lu->query_logins_response) 939 dma_free_coherent(hi->host->device.parent, 940 sizeof(struct sbp2_query_logins_response), 941 lu->query_logins_response, 942 lu->query_logins_response_dma); 943 944 if (lu->status_fifo_addr != CSR1212_INVALID_ADDR_SPACE) 945 hpsb_unregister_addrspace(&sbp2_highlevel, hi->host, 946 lu->status_fifo_addr); 947 948 lu->ud->device.driver_data = NULL; 949 950 if (hi) 951 module_put(hi->host->driver->owner); 952 953 kfree(lu); 954} 955 956#ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA 957/* 958 * Deal with write requests on adapters which do not support physical DMA or 959 * have it switched off. 960 */ 961static int sbp2_handle_physdma_write(struct hpsb_host *host, int nodeid, 962 int destid, quadlet_t *data, u64 addr, 963 size_t length, u16 flags) 964{ 965 memcpy(bus_to_virt((u32) addr), data, length); 966 return RCODE_COMPLETE; 967} 968 969/* 970 * Deal with read requests on adapters which do not support physical DMA or 971 * have it switched off. 972 */ 973static int sbp2_handle_physdma_read(struct hpsb_host *host, int nodeid, 974 quadlet_t *data, u64 addr, size_t length, 975 u16 flags) 976{ 977 memcpy(data, bus_to_virt((u32) addr), length); 978 return RCODE_COMPLETE; 979} 980#endif 981 982/************************************** 983 * SBP-2 protocol related section 984 **************************************/ 985 986static int sbp2_query_logins(struct sbp2_lu *lu) 987{ 988 struct sbp2_fwhost_info *hi = lu->hi; 989 quadlet_t data[2]; 990 int max_logins; 991 int active_logins; 992 993 lu->query_logins_orb->reserved1 = 0x0; 994 lu->query_logins_orb->reserved2 = 0x0; 995 996 lu->query_logins_orb->query_response_lo = lu->query_logins_response_dma; 997 lu->query_logins_orb->query_response_hi = 998 ORB_SET_NODE_ID(hi->host->node_id); 999 lu->query_logins_orb->lun_misc = 1000 ORB_SET_FUNCTION(SBP2_QUERY_LOGINS_REQUEST); 1001 lu->query_logins_orb->lun_misc |= ORB_SET_NOTIFY(1); 1002 lu->query_logins_orb->lun_misc |= ORB_SET_LUN(lu->lun); 1003 1004 lu->query_logins_orb->reserved_resp_length = 1005 ORB_SET_QUERY_LOGINS_RESP_LENGTH( 1006 sizeof(struct sbp2_query_logins_response)); 1007 1008 lu->query_logins_orb->status_fifo_hi = 1009 ORB_SET_STATUS_FIFO_HI(lu->status_fifo_addr, hi->host->node_id); 1010 lu->query_logins_orb->status_fifo_lo = 1011 ORB_SET_STATUS_FIFO_LO(lu->status_fifo_addr); 1012 1013 sbp2util_cpu_to_be32_buffer(lu->query_logins_orb, 1014 sizeof(struct sbp2_query_logins_orb)); 1015 1016 memset(lu->query_logins_response, 0, 1017 sizeof(struct sbp2_query_logins_response)); 1018 1019 data[0] = ORB_SET_NODE_ID(hi->host->node_id); 1020 data[1] = lu->query_logins_orb_dma; 1021 sbp2util_cpu_to_be32_buffer(data, 8); 1022 1023 hpsb_node_write(lu->ne, lu->management_agent_addr, data, 8); 1024 1025 if (sbp2util_access_timeout(lu, 2*HZ)) { 1026 SBP2_INFO("Error querying logins to SBP-2 device - timed out"); 1027 return -EIO; 1028 } 1029 1030 if (lu->status_block.ORB_offset_lo != lu->query_logins_orb_dma) { 1031 SBP2_INFO("Error querying logins to SBP-2 device - timed out"); 1032 return -EIO; 1033 } 1034 1035 if (STATUS_TEST_RDS(lu->status_block.ORB_offset_hi_misc)) { 1036 SBP2_INFO("Error querying logins to SBP-2 device - failed"); 1037 return -EIO; 1038 } 1039 1040 sbp2util_cpu_to_be32_buffer(lu->query_logins_response, 1041 sizeof(struct sbp2_query_logins_response)); 1042 1043 max_logins = RESPONSE_GET_MAX_LOGINS( 1044 lu->query_logins_response->length_max_logins); 1045 SBP2_INFO("Maximum concurrent logins supported: %d", max_logins); 1046 1047 active_logins = RESPONSE_GET_ACTIVE_LOGINS( 1048 lu->query_logins_response->length_max_logins); 1049 SBP2_INFO("Number of active logins: %d", active_logins); 1050 1051 if (active_logins >= max_logins) { 1052 return -EIO; 1053 } 1054 1055 return 0; 1056} 1057 1058static int sbp2_login_device(struct sbp2_lu *lu) 1059{ 1060 struct sbp2_fwhost_info *hi = lu->hi; 1061 quadlet_t data[2]; 1062 1063 if (!lu->login_orb) 1064 return -EIO; 1065 1066 if (!sbp2_exclusive_login && sbp2_query_logins(lu)) { 1067 SBP2_INFO("Device does not support any more concurrent logins"); 1068 return -EIO; 1069 } 1070 1071 /* assume no password */ 1072 lu->login_orb->password_hi = 0; 1073 lu->login_orb->password_lo = 0; 1074 1075 lu->login_orb->login_response_lo = lu->login_response_dma; 1076 lu->login_orb->login_response_hi = ORB_SET_NODE_ID(hi->host->node_id); 1077 lu->login_orb->lun_misc = ORB_SET_FUNCTION(SBP2_LOGIN_REQUEST); 1078 1079 /* one second reconnect time */ 1080 lu->login_orb->lun_misc |= ORB_SET_RECONNECT(0); 1081 lu->login_orb->lun_misc |= ORB_SET_EXCLUSIVE(sbp2_exclusive_login); 1082 lu->login_orb->lun_misc |= ORB_SET_NOTIFY(1); 1083 lu->login_orb->lun_misc |= ORB_SET_LUN(lu->lun); 1084 1085 lu->login_orb->passwd_resp_lengths = 1086 ORB_SET_LOGIN_RESP_LENGTH(sizeof(struct sbp2_login_response)); 1087 1088 lu->login_orb->status_fifo_hi = 1089 ORB_SET_STATUS_FIFO_HI(lu->status_fifo_addr, hi->host->node_id); 1090 lu->login_orb->status_fifo_lo = 1091 ORB_SET_STATUS_FIFO_LO(lu->status_fifo_addr); 1092 1093 sbp2util_cpu_to_be32_buffer(lu->login_orb, 1094 sizeof(struct sbp2_login_orb)); 1095 1096 memset(lu->login_response, 0, sizeof(struct sbp2_login_response)); 1097 1098 data[0] = ORB_SET_NODE_ID(hi->host->node_id); 1099 data[1] = lu->login_orb_dma; 1100 sbp2util_cpu_to_be32_buffer(data, 8); 1101 1102 hpsb_node_write(lu->ne, lu->management_agent_addr, data, 8); 1103 1104 /* wait up to 20 seconds for login status */ 1105 if (sbp2util_access_timeout(lu, 20*HZ)) { 1106 SBP2_ERR("Error logging into SBP-2 device - timed out"); 1107 return -EIO; 1108 } 1109 1110 /* make sure that the returned status matches the login ORB */ 1111 if (lu->status_block.ORB_offset_lo != lu->login_orb_dma) { 1112 SBP2_ERR("Error logging into SBP-2 device - timed out"); 1113 return -EIO; 1114 } 1115 1116 if (STATUS_TEST_RDS(lu->status_block.ORB_offset_hi_misc)) { 1117 SBP2_ERR("Error logging into SBP-2 device - failed"); 1118 return -EIO; 1119 } 1120 1121 sbp2util_cpu_to_be32_buffer(lu->login_response, 1122 sizeof(struct sbp2_login_response)); 1123 lu->command_block_agent_addr = 1124 ((u64)lu->login_response->command_block_agent_hi) << 32; 1125 lu->command_block_agent_addr |= 1126 ((u64)lu->login_response->command_block_agent_lo); 1127 lu->command_block_agent_addr &= 0x0000ffffffffffffULL; 1128 1129 SBP2_INFO("Logged into SBP-2 device"); 1130 return 0; 1131} 1132 1133static int sbp2_logout_device(struct sbp2_lu *lu) 1134{ 1135 struct sbp2_fwhost_info *hi = lu->hi; 1136 quadlet_t data[2]; 1137 int error; 1138 1139 lu->logout_orb->reserved1 = 0x0; 1140 lu->logout_orb->reserved2 = 0x0; 1141 lu->logout_orb->reserved3 = 0x0; 1142 lu->logout_orb->reserved4 = 0x0; 1143 1144 lu->logout_orb->login_ID_misc = ORB_SET_FUNCTION(SBP2_LOGOUT_REQUEST); 1145 lu->logout_orb->login_ID_misc |= 1146 ORB_SET_LOGIN_ID(lu->login_response->length_login_ID); 1147 lu->logout_orb->login_ID_misc |= ORB_SET_NOTIFY(1); 1148 1149 lu->logout_orb->reserved5 = 0x0; 1150 lu->logout_orb->status_fifo_hi = 1151 ORB_SET_STATUS_FIFO_HI(lu->status_fifo_addr, hi->host->node_id); 1152 lu->logout_orb->status_fifo_lo = 1153 ORB_SET_STATUS_FIFO_LO(lu->status_fifo_addr); 1154 1155 sbp2util_cpu_to_be32_buffer(lu->logout_orb, 1156 sizeof(struct sbp2_logout_orb)); 1157 1158 data[0] = ORB_SET_NODE_ID(hi->host->node_id); 1159 data[1] = lu->logout_orb_dma; 1160 sbp2util_cpu_to_be32_buffer(data, 8); 1161 1162 error = hpsb_node_write(lu->ne, lu->management_agent_addr, data, 8); 1163 if (error) 1164 return error; 1165 1166 /* wait up to 1 second for the device to complete logout */ 1167 if (sbp2util_access_timeout(lu, HZ)) 1168 return -EIO; 1169 1170 SBP2_INFO("Logged out of SBP-2 device"); 1171 return 0; 1172} 1173 1174static int sbp2_reconnect_device(struct sbp2_lu *lu) 1175{ 1176 struct sbp2_fwhost_info *hi = lu->hi; 1177 quadlet_t data[2]; 1178 int error; 1179 1180 lu->reconnect_orb->reserved1 = 0x0; 1181 lu->reconnect_orb->reserved2 = 0x0; 1182 lu->reconnect_orb->reserved3 = 0x0; 1183 lu->reconnect_orb->reserved4 = 0x0; 1184 1185 lu->reconnect_orb->login_ID_misc = 1186 ORB_SET_FUNCTION(SBP2_RECONNECT_REQUEST); 1187 lu->reconnect_orb->login_ID_misc |= 1188 ORB_SET_LOGIN_ID(lu->login_response->length_login_ID); 1189 lu->reconnect_orb->login_ID_misc |= ORB_SET_NOTIFY(1); 1190 1191 lu->reconnect_orb->reserved5 = 0x0; 1192 lu->reconnect_orb->status_fifo_hi = 1193 ORB_SET_STATUS_FIFO_HI(lu->status_fifo_addr, hi->host->node_id); 1194 lu->reconnect_orb->status_fifo_lo = 1195 ORB_SET_STATUS_FIFO_LO(lu->status_fifo_addr); 1196 1197 sbp2util_cpu_to_be32_buffer(lu->reconnect_orb, 1198 sizeof(struct sbp2_reconnect_orb)); 1199 1200 data[0] = ORB_SET_NODE_ID(hi->host->node_id); 1201 data[1] = lu->reconnect_orb_dma; 1202 sbp2util_cpu_to_be32_buffer(data, 8); 1203 1204 error = hpsb_node_write(lu->ne, lu->management_agent_addr, data, 8); 1205 if (error) 1206 return error; 1207 1208 /* wait up to 1 second for reconnect status */ 1209 if (sbp2util_access_timeout(lu, HZ)) { 1210 SBP2_ERR("Error reconnecting to SBP-2 device - timed out"); 1211 return -EIO; 1212 } 1213 1214 /* make sure that the returned status matches the reconnect ORB */ 1215 if (lu->status_block.ORB_offset_lo != lu->reconnect_orb_dma) { 1216 SBP2_ERR("Error reconnecting to SBP-2 device - timed out"); 1217 return -EIO; 1218 } 1219 1220 if (STATUS_TEST_RDS(lu->status_block.ORB_offset_hi_misc)) { 1221 SBP2_ERR("Error reconnecting to SBP-2 device - failed"); 1222 return -EIO; 1223 } 1224 1225 SBP2_INFO("Reconnected to SBP-2 device"); 1226 return 0; 1227} 1228 1229/* 1230 * Set the target node's Single Phase Retry limit. Affects the target's retry 1231 * behaviour if our node is too busy to accept requests. 1232 */ 1233static int sbp2_set_busy_timeout(struct sbp2_lu *lu) 1234{ 1235 quadlet_t data; 1236 1237 data = cpu_to_be32(SBP2_BUSY_TIMEOUT_VALUE); 1238 if (hpsb_node_write(lu->ne, SBP2_BUSY_TIMEOUT_ADDRESS, &data, 4)) 1239 SBP2_ERR("%s error", __FUNCTION__); 1240 return 0; 1241} 1242 1243static void sbp2_parse_unit_directory(struct sbp2_lu *lu, 1244 struct unit_directory *ud) 1245{ 1246 struct csr1212_keyval *kv; 1247 struct csr1212_dentry *dentry; 1248 u64 management_agent_addr; 1249 u32 unit_characteristics, firmware_revision; 1250 unsigned workarounds; 1251 int i; 1252 1253 management_agent_addr = 0; 1254 unit_characteristics = 0; 1255 firmware_revision = 0; 1256 1257 csr1212_for_each_dir_entry(ud->ne->csr, kv, ud->ud_kv, dentry) { 1258 switch (kv->key.id) { 1259 case CSR1212_KV_ID_DEPENDENT_INFO: 1260 if (kv->key.type == CSR1212_KV_TYPE_CSR_OFFSET) 1261 management_agent_addr = 1262 CSR1212_REGISTER_SPACE_BASE + 1263 (kv->value.csr_offset << 2); 1264 1265 else if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) 1266 lu->lun = ORB_SET_LUN(kv->value.immediate); 1267 break; 1268 1269 case SBP2_UNIT_CHARACTERISTICS_KEY: 1270 unit_characteristics = kv->value.immediate; 1271 break; 1272 1273 case SBP2_FIRMWARE_REVISION_KEY: 1274 firmware_revision = kv->value.immediate; 1275 break; 1276 1277 default: 1278 break; 1279 } 1280 } 1281 1282 workarounds = sbp2_default_workarounds; 1283 1284 if (!(workarounds & SBP2_WORKAROUND_OVERRIDE)) 1285 for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) { 1286 if (sbp2_workarounds_table[i].firmware_revision != 1287 SBP2_ROM_VALUE_WILDCARD && 1288 sbp2_workarounds_table[i].firmware_revision != 1289 (firmware_revision & 0xffff00)) 1290 continue; 1291 if (sbp2_workarounds_table[i].model_id != 1292 SBP2_ROM_VALUE_WILDCARD && 1293 sbp2_workarounds_table[i].model_id != ud->model_id) 1294 continue; 1295 workarounds |= sbp2_workarounds_table[i].workarounds; 1296 break; 1297 } 1298 1299 if (workarounds) 1300 SBP2_INFO("Workarounds for node " NODE_BUS_FMT ": 0x%x " 1301 "(firmware_revision 0x%06x, vendor_id 0x%06x," 1302 " model_id 0x%06x)", 1303 NODE_BUS_ARGS(ud->ne->host, ud->ne->nodeid), 1304 workarounds, firmware_revision, 1305 ud->vendor_id ? ud->vendor_id : ud->ne->vendor_id, 1306 ud->model_id); 1307 1308 /* We would need one SCSI host template for each target to adjust 1309 * max_sectors on the fly, therefore warn only. */ 1310 if (workarounds & SBP2_WORKAROUND_128K_MAX_TRANS && 1311 (sbp2_max_sectors * 512) > (128 * 1024)) 1312 SBP2_INFO("Node " NODE_BUS_FMT ": Bridge only supports 128KB " 1313 "max transfer size. WARNING: Current max_sectors " 1314 "setting is larger than 128KB (%d sectors)", 1315 NODE_BUS_ARGS(ud->ne->host, ud->ne->nodeid), 1316 sbp2_max_sectors); 1317 1318 /* If this is a logical unit directory entry, process the parent 1319 * to get the values. */ 1320 if (ud->flags & UNIT_DIRECTORY_LUN_DIRECTORY) { 1321 struct unit_directory *parent_ud = container_of( 1322 ud->device.parent, struct unit_directory, device); 1323 sbp2_parse_unit_directory(lu, parent_ud); 1324 } else { 1325 lu->management_agent_addr = management_agent_addr; 1326 lu->workarounds = workarounds; 1327 if (ud->flags & UNIT_DIRECTORY_HAS_LUN) 1328 lu->lun = ORB_SET_LUN(ud->lun); 1329 } 1330} 1331 1332#define SBP2_PAYLOAD_TO_BYTES(p) (1 << ((p) + 2)) 1333 1334/* 1335 * This function is called in order to determine the max speed and packet 1336 * size we can use in our ORBs. Note, that we (the driver and host) only 1337 * initiate the transaction. The SBP-2 device actually transfers the data 1338 * (by reading from the DMA area we tell it). This means that the SBP-2 1339 * device decides the actual maximum data it can transfer. We just tell it 1340 * the speed that it needs to use, and the max_rec the host supports, and 1341 * it takes care of the rest. 1342 */ 1343static int sbp2_max_speed_and_size(struct sbp2_lu *lu) 1344{ 1345 struct sbp2_fwhost_info *hi = lu->hi; 1346 u8 payload; 1347 1348 lu->speed_code = hi->host->speed[NODEID_TO_NODE(lu->ne->nodeid)]; 1349 1350 if (lu->speed_code > sbp2_max_speed) { 1351 lu->speed_code = sbp2_max_speed; 1352 SBP2_INFO("Reducing speed to %s", 1353 hpsb_speedto_str[sbp2_max_speed]); 1354 } 1355 1356 /* Payload size is the lesser of what our speed supports and what 1357 * our host supports. */ 1358 payload = min(sbp2_speedto_max_payload[lu->speed_code], 1359 (u8) (hi->host->csr.max_rec - 1)); 1360 1361 if (lu->ne->host->low_addr_space < (1ULL << 32)) 1362 while (SBP2_PAYLOAD_TO_BYTES(payload) + 24 > PAGE_SIZE && 1363 payload) 1364 payload--; 1365 1366 SBP2_INFO("Node " NODE_BUS_FMT ": Max speed [%s] - Max payload [%u]", 1367 NODE_BUS_ARGS(hi->host, lu->ne->nodeid), 1368 hpsb_speedto_str[lu->speed_code], 1369 SBP2_PAYLOAD_TO_BYTES(payload)); 1370 1371 lu->max_payload_size = payload; 1372 return 0; 1373} 1374 1375static int sbp2_agent_reset(struct sbp2_lu *lu, int wait) 1376{ 1377 quadlet_t data; 1378 u64 addr; 1379 int retval; 1380 unsigned long flags; 1381 1382 /* flush lu->protocol_work */ 1383 if (wait) 1384 flush_scheduled_work(); 1385 1386 data = ntohl(SBP2_AGENT_RESET_DATA); 1387 addr = lu->command_block_agent_addr + SBP2_AGENT_RESET_OFFSET; 1388 1389 if (wait) 1390 retval = hpsb_node_write(lu->ne, addr, &data, 4); 1391 else 1392 retval = sbp2util_node_write_no_wait(lu->ne, addr, &data, 4); 1393 1394 if (retval < 0) { 1395 SBP2_ERR("hpsb_node_write failed.\n"); 1396 return -EIO; 1397 } 1398 1399 /* make sure that the ORB_POINTER is written on next command */ 1400 spin_lock_irqsave(&lu->cmd_orb_lock, flags); 1401 lu->last_orb = NULL; 1402 spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); 1403 1404 return 0; 1405} 1406 1407static void sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb, 1408 struct sbp2_fwhost_info *hi, 1409 struct sbp2_command_info *cmd, 1410 unsigned int scsi_use_sg, 1411 struct scatterlist *sgpnt, 1412 u32 orb_direction, 1413 enum dma_data_direction dma_dir) 1414{ 1415 cmd->dma_dir = dma_dir; 1416 orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id); 1417 orb->misc |= ORB_SET_DIRECTION(orb_direction); 1418 1419 /* special case if only one element (and less than 64KB in size) */ 1420 if ((scsi_use_sg == 1) && 1421 (sgpnt[0].length <= SBP2_MAX_SG_ELEMENT_LENGTH)) { 1422 1423 cmd->dma_size = sgpnt[0].length; 1424 cmd->dma_type = CMD_DMA_PAGE; 1425 cmd->cmd_dma = dma_map_page(hi->host->device.parent, 1426 sgpnt[0].page, sgpnt[0].offset, 1427 cmd->dma_size, cmd->dma_dir); 1428 1429 orb->data_descriptor_lo = cmd->cmd_dma; 1430 orb->misc |= ORB_SET_DATA_SIZE(cmd->dma_size); 1431 1432 } else { 1433 struct sbp2_unrestricted_page_table *sg_element = 1434 &cmd->scatter_gather_element[0]; 1435 u32 sg_count, sg_len; 1436 dma_addr_t sg_addr; 1437 int i, count = dma_map_sg(hi->host->device.parent, sgpnt, 1438 scsi_use_sg, dma_dir); 1439 1440 cmd->dma_size = scsi_use_sg; 1441 cmd->sge_buffer = sgpnt; 1442 1443 /* use page tables (s/g) */ 1444 orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1); 1445 orb->data_descriptor_lo = cmd->sge_dma; 1446 1447 /* loop through and fill out our SBP-2 page tables 1448 * (and split up anything too large) */ 1449 for (i = 0, sg_count = 0 ; i < count; i++, sgpnt++) { 1450 sg_len = sg_dma_len(sgpnt); 1451 sg_addr = sg_dma_address(sgpnt); 1452 while (sg_len) { 1453 sg_element[sg_count].segment_base_lo = sg_addr; 1454 if (sg_len > SBP2_MAX_SG_ELEMENT_LENGTH) { 1455 sg_element[sg_count].length_segment_base_hi = 1456 PAGE_TABLE_SET_SEGMENT_LENGTH(SBP2_MAX_SG_ELEMENT_LENGTH); 1457 sg_addr += SBP2_MAX_SG_ELEMENT_LENGTH; 1458 sg_len -= SBP2_MAX_SG_ELEMENT_LENGTH; 1459 } else { 1460 sg_element[sg_count].length_segment_base_hi = 1461 PAGE_TABLE_SET_SEGMENT_LENGTH(sg_len); 1462 sg_len = 0; 1463 } 1464 sg_count++; 1465 } 1466 } 1467 1468 orb->misc |= ORB_SET_DATA_SIZE(sg_count); 1469 1470 sbp2util_cpu_to_be32_buffer(sg_element, 1471 (sizeof(struct sbp2_unrestricted_page_table)) * 1472 sg_count); 1473 } 1474} 1475 1476static void sbp2_prep_command_orb_no_sg(struct sbp2_command_orb *orb, 1477 struct sbp2_fwhost_info *hi, 1478 struct sbp2_command_info *cmd, 1479 struct scatterlist *sgpnt, 1480 u32 orb_direction, 1481 unsigned int scsi_request_bufflen, 1482 void *scsi_request_buffer, 1483 enum dma_data_direction dma_dir) 1484{ 1485 cmd->dma_dir = dma_dir; 1486 cmd->dma_size = scsi_request_bufflen; 1487 cmd->dma_type = CMD_DMA_SINGLE; 1488 cmd->cmd_dma = dma_map_single(hi->host->device.parent, 1489 scsi_request_buffer, 1490 cmd->dma_size, cmd->dma_dir); 1491 orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id); 1492 orb->misc |= ORB_SET_DIRECTION(orb_direction); 1493 1494 /* handle case where we get a command w/o s/g enabled 1495 * (but check for transfers larger than 64K) */ 1496 if (scsi_request_bufflen <= SBP2_MAX_SG_ELEMENT_LENGTH) { 1497 1498 orb->data_descriptor_lo = cmd->cmd_dma; 1499 orb->misc |= ORB_SET_DATA_SIZE(scsi_request_bufflen); 1500 1501 } else { 1502 /* The buffer is too large. Turn this into page tables. */ 1503 1504 struct sbp2_unrestricted_page_table *sg_element = 1505 &cmd->scatter_gather_element[0]; 1506 u32 sg_count, sg_len; 1507 dma_addr_t sg_addr; 1508 1509 orb->data_descriptor_lo = cmd->sge_dma; 1510 orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1); 1511 1512 /* fill out our SBP-2 page tables; split up the large buffer */ 1513 sg_count = 0; 1514 sg_len = scsi_request_bufflen; 1515 sg_addr = cmd->cmd_dma; 1516 while (sg_len) { 1517 sg_element[sg_count].segment_base_lo = sg_addr; 1518 if (sg_len > SBP2_MAX_SG_ELEMENT_LENGTH) { 1519 sg_element[sg_count].length_segment_base_hi = 1520 PAGE_TABLE_SET_SEGMENT_LENGTH(SBP2_MAX_SG_ELEMENT_LENGTH); 1521 sg_addr += SBP2_MAX_SG_ELEMENT_LENGTH; 1522 sg_len -= SBP2_MAX_SG_ELEMENT_LENGTH; 1523 } else { 1524 sg_element[sg_count].length_segment_base_hi = 1525 PAGE_TABLE_SET_SEGMENT_LENGTH(sg_len); 1526 sg_len = 0; 1527 } 1528 sg_count++; 1529 } 1530 1531 orb->misc |= ORB_SET_DATA_SIZE(sg_count); 1532 1533 sbp2util_cpu_to_be32_buffer(sg_element, 1534 (sizeof(struct sbp2_unrestricted_page_table)) * 1535 sg_count); 1536 } 1537} 1538 1539static void sbp2_create_command_orb(struct sbp2_lu *lu, 1540 struct sbp2_command_info *cmd, 1541 unchar *scsi_cmd, 1542 unsigned int scsi_use_sg, 1543 unsigned int scsi_request_bufflen, 1544 void *scsi_request_buffer, 1545 enum dma_data_direction dma_dir) 1546{ 1547 struct sbp2_fwhost_info *hi = lu->hi; 1548 struct scatterlist *sgpnt = (struct scatterlist *)scsi_request_buffer; 1549 struct sbp2_command_orb *orb = &cmd->command_orb; 1550 u32 orb_direction; 1551 1552 /* 1553 * Set-up our command ORB. 1554 * 1555 * NOTE: We're doing unrestricted page tables (s/g), as this is 1556 * best performance (at least with the devices I have). This means 1557 * that data_size becomes the number of s/g elements, and 1558 * page_size should be zero (for unrestricted). 1559 */ 1560 orb->next_ORB_hi = ORB_SET_NULL_PTR(1); 1561 orb->next_ORB_lo = 0x0; 1562 orb->misc = ORB_SET_MAX_PAYLOAD(lu->max_payload_size); 1563 orb->misc |= ORB_SET_SPEED(lu->speed_code); 1564 orb->misc |= ORB_SET_NOTIFY(1); 1565 1566 if (dma_dir == DMA_NONE) 1567 orb_direction = ORB_DIRECTION_NO_DATA_TRANSFER; 1568 else if (dma_dir == DMA_TO_DEVICE && scsi_request_bufflen) 1569 orb_direction = ORB_DIRECTION_WRITE_TO_MEDIA; 1570 else if (dma_dir == DMA_FROM_DEVICE && scsi_request_bufflen) 1571 orb_direction = ORB_DIRECTION_READ_FROM_MEDIA; 1572 else { 1573 SBP2_INFO("Falling back to DMA_NONE"); 1574 orb_direction = ORB_DIRECTION_NO_DATA_TRANSFER; 1575 } 1576 1577 /* set up our page table stuff */ 1578 if (orb_direction == ORB_DIRECTION_NO_DATA_TRANSFER) { 1579 orb->data_descriptor_hi = 0x0; 1580 orb->data_descriptor_lo = 0x0; 1581 orb->misc |= ORB_SET_DIRECTION(1); 1582 } else if (scsi_use_sg) 1583 sbp2_prep_command_orb_sg(orb, hi, cmd, scsi_use_sg, sgpnt, 1584 orb_direction, dma_dir); 1585 else 1586 sbp2_prep_command_orb_no_sg(orb, hi, cmd, sgpnt, orb_direction, 1587 scsi_request_bufflen, 1588 scsi_request_buffer, dma_dir); 1589 1590 sbp2util_cpu_to_be32_buffer(orb, sizeof(*orb)); 1591 1592 memset(orb->cdb, 0, 12); 1593 memcpy(orb->cdb, scsi_cmd, COMMAND_SIZE(*scsi_cmd)); 1594} 1595 1596static void sbp2_link_orb_command(struct sbp2_lu *lu, 1597 struct sbp2_command_info *cmd) 1598{ 1599 struct sbp2_fwhost_info *hi = lu->hi; 1600 struct sbp2_command_orb *last_orb; 1601 dma_addr_t last_orb_dma; 1602 u64 addr = lu->command_block_agent_addr; 1603 quadlet_t data[2]; 1604 size_t length; 1605 unsigned long flags; 1606 1607 dma_sync_single_for_device(hi->host->device.parent, 1608 cmd->command_orb_dma, 1609 sizeof(struct sbp2_command_orb), 1610 DMA_TO_DEVICE); 1611 dma_sync_single_for_device(hi->host->device.parent, cmd->sge_dma, 1612 sizeof(cmd->scatter_gather_element), 1613 DMA_TO_DEVICE); 1614 1615 /* check to see if there are any previous orbs to use */ 1616 spin_lock_irqsave(&lu->cmd_orb_lock, flags); 1617 last_orb = lu->last_orb; 1618 last_orb_dma = lu->last_orb_dma; 1619 if (!last_orb) { 1620 /* 1621 * last_orb == NULL means: We know that the target's fetch agent 1622 * is not active right now. 1623 */ 1624 addr += SBP2_ORB_POINTER_OFFSET; 1625 data[0] = ORB_SET_NODE_ID(hi->host->node_id); 1626 data[1] = cmd->command_orb_dma; 1627 sbp2util_cpu_to_be32_buffer(data, 8); 1628 length = 8; 1629 } else { 1630 /* 1631 * last_orb != NULL means: We know that the target's fetch agent 1632 * is (very probably) not dead or in reset state right now. 1633 * We have an ORB already sent that we can append a new one to. 1634 * The target's fetch agent may or may not have read this 1635 * previous ORB yet. 1636 */ 1637 dma_sync_single_for_cpu(hi->host->device.parent, last_orb_dma, 1638 sizeof(struct sbp2_command_orb), 1639 DMA_TO_DEVICE); 1640 last_orb->next_ORB_lo = cpu_to_be32(cmd->command_orb_dma); 1641 wmb(); 1642 /* Tells hardware that this pointer is valid */ 1643 last_orb->next_ORB_hi = 0; 1644 dma_sync_single_for_device(hi->host->device.parent, 1645 last_orb_dma, 1646 sizeof(struct sbp2_command_orb), 1647 DMA_TO_DEVICE); 1648 addr += SBP2_DOORBELL_OFFSET; 1649 data[0] = 0; 1650 length = 4; 1651 } 1652 lu->last_orb = &cmd->command_orb; 1653 lu->last_orb_dma = cmd->command_orb_dma; 1654 spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); 1655 1656 if (sbp2util_node_write_no_wait(lu->ne, addr, data, length)) { 1657 /* 1658 * sbp2util_node_write_no_wait failed. We certainly ran out 1659 * of transaction labels, perhaps just because there were no 1660 * context switches which gave khpsbpkt a chance to collect 1661 * free tlabels. Try again in non-atomic context. If necessary, 1662 * the workqueue job will sleep to guaranteedly get a tlabel. 1663 * We do not accept new commands until the job is over. 1664 */ 1665 scsi_block_requests(lu->shost); 1666 PREPARE_WORK(&lu->protocol_work, 1667 last_orb ? sbp2util_write_doorbell: 1668 sbp2util_write_orb_pointer); 1669 schedule_work(&lu->protocol_work); 1670 } 1671} 1672 1673static int sbp2_send_command(struct sbp2_lu *lu, struct scsi_cmnd *SCpnt, 1674 void (*done)(struct scsi_cmnd *)) 1675{ 1676 unchar *scsi_cmd = (unchar *)SCpnt->cmnd; 1677 unsigned int request_bufflen = SCpnt->request_bufflen; 1678 struct sbp2_command_info *cmd; 1679 1680 cmd = sbp2util_allocate_command_orb(lu, SCpnt, done); 1681 if (!cmd) 1682 return -EIO; 1683 1684 sbp2_create_command_orb(lu, cmd, scsi_cmd, SCpnt->use_sg, 1685 request_bufflen, SCpnt->request_buffer, 1686 SCpnt->sc_data_direction); 1687 sbp2_link_orb_command(lu, cmd); 1688 1689 return 0; 1690} 1691 1692/* 1693 * Translates SBP-2 status into SCSI sense data for check conditions 1694 */ 1695static unsigned int sbp2_status_to_sense_data(unchar *sbp2_status, 1696 unchar *sense_data) 1697{ 1698 /* OK, it's pretty ugly... ;-) */ 1699 sense_data[0] = 0x70; 1700 sense_data[1] = 0x0; 1701 sense_data[2] = sbp2_status[9]; 1702 sense_data[3] = sbp2_status[12]; 1703 sense_data[4] = sbp2_status[13]; 1704 sense_data[5] = sbp2_status[14]; 1705 sense_data[6] = sbp2_status[15]; 1706 sense_data[7] = 10; 1707 sense_data[8] = sbp2_status[16]; 1708 sense_data[9] = sbp2_status[17]; 1709 sense_data[10] = sbp2_status[18]; 1710 sense_data[11] = sbp2_status[19]; 1711 sense_data[12] = sbp2_status[10]; 1712 sense_data[13] = sbp2_status[11]; 1713 sense_data[14] = sbp2_status[20]; 1714 sense_data[15] = sbp2_status[21]; 1715 1716 return sbp2_status[8] & 0x3f; 1717} 1718 1719static int sbp2_handle_status_write(struct hpsb_host *host, int nodeid, 1720 int destid, quadlet_t *data, u64 addr, 1721 size_t length, u16 fl) 1722{ 1723 struct sbp2_fwhost_info *hi; 1724 struct sbp2_lu *lu = NULL, *lu_tmp; 1725 struct scsi_cmnd *SCpnt = NULL; 1726 struct sbp2_status_block *sb; 1727 u32 scsi_status = SBP2_SCSI_STATUS_GOOD; 1728 struct sbp2_command_info *cmd; 1729 unsigned long flags; 1730 1731 if (unlikely(length < 8 || length > sizeof(struct sbp2_status_block))) { 1732 SBP2_ERR("Wrong size of status block"); 1733 return RCODE_ADDRESS_ERROR; 1734 } 1735 if (unlikely(!host)) { 1736 SBP2_ERR("host is NULL - this is bad!"); 1737 return RCODE_ADDRESS_ERROR; 1738 } 1739 hi = hpsb_get_hostinfo(&sbp2_highlevel, host); 1740 if (unlikely(!hi)) { 1741 SBP2_ERR("host info is NULL - this is bad!"); 1742 return RCODE_ADDRESS_ERROR; 1743 } 1744 1745 /* Find the unit which wrote the status. */ 1746 list_for_each_entry(lu_tmp, &hi->logical_units, lu_list) { 1747 if (lu_tmp->ne->nodeid == nodeid && 1748 lu_tmp->status_fifo_addr == addr) { 1749 lu = lu_tmp; 1750 break; 1751 } 1752 } 1753 if (unlikely(!lu)) { 1754 SBP2_ERR("lu is NULL - device is gone?"); 1755 return RCODE_ADDRESS_ERROR; 1756 } 1757 1758 /* Put response into lu status fifo buffer. The first two bytes 1759 * come in big endian bit order. Often the target writes only a 1760 * truncated status block, minimally the first two quadlets. The rest 1761 * is implied to be zeros. */ 1762 sb = &lu->status_block; 1763 memset(sb->command_set_dependent, 0, sizeof(sb->command_set_dependent)); 1764 memcpy(sb, data, length); 1765 sbp2util_be32_to_cpu_buffer(sb, 8); 1766 1767 /* Ignore unsolicited status. Handle command ORB status. */ 1768 if (unlikely(STATUS_GET_SRC(sb->ORB_offset_hi_misc) == 2)) 1769 cmd = NULL; 1770 else 1771 cmd = sbp2util_find_command_for_orb(lu, sb->ORB_offset_lo); 1772 if (cmd) { 1773 dma_sync_single_for_cpu(hi->host->device.parent, 1774 cmd->command_orb_dma, 1775 sizeof(struct sbp2_command_orb), 1776 DMA_TO_DEVICE); 1777 dma_sync_single_for_cpu(hi->host->device.parent, cmd->sge_dma, 1778 sizeof(cmd->scatter_gather_element), 1779 DMA_TO_DEVICE); 1780 /* Grab SCSI command pointers and check status. */ 1781 SCpnt = cmd->Current_SCpnt; 1782 spin_lock_irqsave(&lu->cmd_orb_lock, flags); 1783 sbp2util_mark_command_completed(lu, cmd); 1784 spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); 1785 1786 if (SCpnt) { 1787 u32 h = sb->ORB_offset_hi_misc; 1788 u32 r = STATUS_GET_RESP(h); 1789 1790 if (r != RESP_STATUS_REQUEST_COMPLETE) { 1791 SBP2_INFO("resp 0x%x, sbp_status 0x%x", 1792 r, STATUS_GET_SBP_STATUS(h)); 1793 scsi_status = 1794 r == RESP_STATUS_TRANSPORT_FAILURE ? 1795 SBP2_SCSI_STATUS_BUSY : 1796 SBP2_SCSI_STATUS_COMMAND_TERMINATED; 1797 } 1798 1799 if (STATUS_GET_LEN(h) > 1) 1800 scsi_status = sbp2_status_to_sense_data( 1801 (unchar *)sb, SCpnt->sense_buffer); 1802 1803 if (STATUS_TEST_DEAD(h)) 1804 sbp2_agent_reset(lu, 0); 1805 } 1806 1807 /* Check here to see if there are no commands in-use. If there 1808 * are none, we know that the fetch agent left the active state 1809 * _and_ that we did not reactivate it yet. Therefore clear 1810 * last_orb so that next time we write directly to the 1811 * ORB_POINTER register. That way the fetch agent does not need 1812 * to refetch the next_ORB. */ 1813 spin_lock_irqsave(&lu->cmd_orb_lock, flags); 1814 if (list_empty(&lu->cmd_orb_inuse)) 1815 lu->last_orb = NULL; 1816 spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); 1817 1818 } else { 1819 /* It's probably status after a management request. */ 1820 if ((sb->ORB_offset_lo == lu->reconnect_orb_dma) || 1821 (sb->ORB_offset_lo == lu->login_orb_dma) || 1822 (sb->ORB_offset_lo == lu->query_logins_orb_dma) || 1823 (sb->ORB_offset_lo == lu->logout_orb_dma)) { 1824 lu->access_complete = 1; 1825 wake_up_interruptible(&sbp2_access_wq); 1826 } 1827 } 1828 1829 if (SCpnt) 1830 sbp2scsi_complete_command(lu, scsi_status, SCpnt, 1831 cmd->Current_done); 1832 return RCODE_COMPLETE; 1833} 1834 1835/************************************** 1836 * SCSI interface related section 1837 **************************************/ 1838 1839static int sbp2scsi_queuecommand(struct scsi_cmnd *SCpnt, 1840 void (*done)(struct scsi_cmnd *)) 1841{ 1842 struct sbp2_lu *lu = (struct sbp2_lu *)SCpnt->device->host->hostdata[0]; 1843 struct sbp2_fwhost_info *hi; 1844 int result = DID_NO_CONNECT << 16; 1845 1846 if (unlikely(!sbp2util_node_is_available(lu))) 1847 goto done; 1848 1849 hi = lu->hi; 1850 1851 if (unlikely(!hi)) { 1852 SBP2_ERR("sbp2_fwhost_info is NULL - this is bad!"); 1853 goto done; 1854 } 1855 1856 /* Multiple units are currently represented to the SCSI core as separate 1857 * targets, not as one target with multiple LUs. Therefore return 1858 * selection time-out to any IO directed at non-zero LUNs. */ 1859 if (unlikely(SCpnt->device->lun)) 1860 goto done; 1861 1862 if (unlikely(!hpsb_node_entry_valid(lu->ne))) { 1863 SBP2_ERR("Bus reset in progress - rejecting command"); 1864 result = DID_BUS_BUSY << 16; 1865 goto done; 1866 } 1867 1868 /* Bidirectional commands are not yet implemented, 1869 * and unknown transfer direction not handled. */ 1870 if (unlikely(SCpnt->sc_data_direction == DMA_BIDIRECTIONAL)) { 1871 SBP2_ERR("Cannot handle DMA_BIDIRECTIONAL - rejecting command"); 1872 result = DID_ERROR << 16; 1873 goto done; 1874 } 1875 1876 if (sbp2_send_command(lu, SCpnt, done)) { 1877 SBP2_ERR("Error sending SCSI command"); 1878 sbp2scsi_complete_command(lu, 1879 SBP2_SCSI_STATUS_SELECTION_TIMEOUT, 1880 SCpnt, done); 1881 } 1882 return 0; 1883 1884done: 1885 SCpnt->result = result; 1886 done(SCpnt); 1887 return 0; 1888} 1889 1890static void sbp2scsi_complete_all_commands(struct sbp2_lu *lu, u32 status) 1891{ 1892 struct sbp2_fwhost_info *hi = lu->hi; 1893 struct list_head *lh; 1894 struct sbp2_command_info *cmd; 1895 unsigned long flags; 1896 1897 spin_lock_irqsave(&lu->cmd_orb_lock, flags); 1898 while (!list_empty(&lu->cmd_orb_inuse)) { 1899 lh = lu->cmd_orb_inuse.next; 1900 cmd = list_entry(lh, struct sbp2_command_info, list); 1901 dma_sync_single_for_cpu(hi->host->device.parent, 1902 cmd->command_orb_dma, 1903 sizeof(struct sbp2_command_orb), 1904 DMA_TO_DEVICE); 1905 dma_sync_single_for_cpu(hi->host->device.parent, cmd->sge_dma, 1906 sizeof(cmd->scatter_gather_element), 1907 DMA_TO_DEVICE); 1908 sbp2util_mark_command_completed(lu, cmd); 1909 if (cmd->Current_SCpnt) { 1910 cmd->Current_SCpnt->result = status << 16; 1911 cmd->Current_done(cmd->Current_SCpnt); 1912 } 1913 } 1914 spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); 1915 1916 return; 1917} 1918 1919/* 1920 * Complete a regular SCSI command. Can be called in atomic context. 1921 */ 1922static void sbp2scsi_complete_command(struct sbp2_lu *lu, u32 scsi_status, 1923 struct scsi_cmnd *SCpnt, 1924 void (*done)(struct scsi_cmnd *)) 1925{ 1926 if (!SCpnt) { 1927 SBP2_ERR("SCpnt is NULL"); 1928 return; 1929 } 1930 1931 switch (scsi_status) { 1932 case SBP2_SCSI_STATUS_GOOD: 1933 SCpnt->result = DID_OK << 16; 1934 break; 1935 1936 case SBP2_SCSI_STATUS_BUSY: 1937 SBP2_ERR("SBP2_SCSI_STATUS_BUSY"); 1938 SCpnt->result = DID_BUS_BUSY << 16; 1939 break; 1940 1941 case SBP2_SCSI_STATUS_CHECK_CONDITION: 1942 SCpnt->result = CHECK_CONDITION << 1 | DID_OK << 16; 1943 break; 1944 1945 case SBP2_SCSI_STATUS_SELECTION_TIMEOUT: 1946 SBP2_ERR("SBP2_SCSI_STATUS_SELECTION_TIMEOUT"); 1947 SCpnt->result = DID_NO_CONNECT << 16; 1948 scsi_print_command(SCpnt); 1949 break; 1950 1951 case SBP2_SCSI_STATUS_CONDITION_MET: 1952 case SBP2_SCSI_STATUS_RESERVATION_CONFLICT: 1953 case SBP2_SCSI_STATUS_COMMAND_TERMINATED: 1954 SBP2_ERR("Bad SCSI status = %x", scsi_status); 1955 SCpnt->result = DID_ERROR << 16; 1956 scsi_print_command(SCpnt); 1957 break; 1958 1959 default: 1960 SBP2_ERR("Unsupported SCSI status = %x", scsi_status); 1961 SCpnt->result = DID_ERROR << 16; 1962 } 1963 1964 /* If a bus reset is in progress and there was an error, complete 1965 * the command as busy so that it will get retried. */ 1966 if (!hpsb_node_entry_valid(lu->ne) 1967 && (scsi_status != SBP2_SCSI_STATUS_GOOD)) { 1968 SBP2_ERR("Completing command with busy (bus reset)"); 1969 SCpnt->result = DID_BUS_BUSY << 16; 1970 } 1971 1972 /* Tell the SCSI stack that we're done with this command. */ 1973 done(SCpnt); 1974} 1975 1976static int sbp2scsi_slave_alloc(struct scsi_device *sdev) 1977{ 1978 struct sbp2_lu *lu = (struct sbp2_lu *)sdev->host->hostdata[0]; 1979 1980 lu->sdev = sdev; 1981 sdev->allow_restart = 1; 1982 1983 if (lu->workarounds & SBP2_WORKAROUND_INQUIRY_36) 1984 sdev->inquiry_len = 36; 1985 return 0; 1986} 1987 1988static int sbp2scsi_slave_configure(struct scsi_device *sdev) 1989{ 1990 struct sbp2_lu *lu = (struct sbp2_lu *)sdev->host->hostdata[0]; 1991 1992 sdev->use_10_for_rw = 1; 1993 1994 if (sdev->type == TYPE_ROM) 1995 sdev->use_10_for_ms = 1; 1996 if (sdev->type == TYPE_DISK && 1997 lu->workarounds & SBP2_WORKAROUND_MODE_SENSE_8) 1998 sdev->skip_ms_page_8 = 1; 1999 if (lu->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) 2000 sdev->fix_capacity = 1; 2001 return 0; 2002} 2003 2004static void sbp2scsi_slave_destroy(struct scsi_device *sdev) 2005{ 2006 ((struct sbp2_lu *)sdev->host->hostdata[0])->sdev = NULL; 2007 return; 2008} 2009 2010/* 2011 * Called by scsi stack when something has really gone wrong. 2012 * Usually called when a command has timed-out for some reason. 2013 */ 2014static int sbp2scsi_abort(struct scsi_cmnd *SCpnt) 2015{ 2016 struct sbp2_lu *lu = (struct sbp2_lu *)SCpnt->device->host->hostdata[0]; 2017 struct sbp2_fwhost_info *hi = lu->hi; 2018 struct sbp2_command_info *cmd; 2019 unsigned long flags; 2020 2021 SBP2_INFO("aborting sbp2 command"); 2022 scsi_print_command(SCpnt); 2023 2024 if (sbp2util_node_is_available(lu)) { 2025 sbp2_agent_reset(lu, 1); 2026 2027 /* Return a matching command structure to the free pool. */ 2028 spin_lock_irqsave(&lu->cmd_orb_lock, flags); 2029 cmd = sbp2util_find_command_for_SCpnt(lu, SCpnt); 2030 if (cmd) { 2031 dma_sync_single_for_cpu(hi->host->device.parent, 2032 cmd->command_orb_dma, 2033 sizeof(struct sbp2_command_orb), 2034 DMA_TO_DEVICE); 2035 dma_sync_single_for_cpu(hi->host->device.parent, 2036 cmd->sge_dma, 2037 sizeof(cmd->scatter_gather_element), 2038 DMA_TO_DEVICE); 2039 sbp2util_mark_command_completed(lu, cmd); 2040 if (cmd->Current_SCpnt) { 2041 cmd->Current_SCpnt->result = DID_ABORT << 16; 2042 cmd->Current_done(cmd->Current_SCpnt); 2043 } 2044 } 2045 spin_unlock_irqrestore(&lu->cmd_orb_lock, flags); 2046 2047 sbp2scsi_complete_all_commands(lu, DID_BUS_BUSY); 2048 } 2049 2050 return SUCCESS; 2051} 2052 2053/* 2054 * Called by scsi stack when something has really gone wrong. 2055 */ 2056static int sbp2scsi_reset(struct scsi_cmnd *SCpnt) 2057{ 2058 struct sbp2_lu *lu = (struct sbp2_lu *)SCpnt->device->host->hostdata[0]; 2059 2060 SBP2_INFO("reset requested"); 2061 2062 if (sbp2util_node_is_available(lu)) { 2063 SBP2_INFO("generating sbp2 fetch agent reset"); 2064 sbp2_agent_reset(lu, 1); 2065 } 2066 2067 return SUCCESS; 2068} 2069 2070static ssize_t sbp2_sysfs_ieee1394_id_show(struct device *dev, 2071 struct device_attribute *attr, 2072 char *buf) 2073{ 2074 struct scsi_device *sdev; 2075 struct sbp2_lu *lu; 2076 2077 if (!(sdev = to_scsi_device(dev))) 2078 return 0; 2079 2080 if (!(lu = (struct sbp2_lu *)sdev->host->hostdata[0])) 2081 return 0; 2082 2083 if (sbp2_long_sysfs_ieee1394_id) 2084 return sprintf(buf, "%016Lx:%06x:%04x\n", 2085 (unsigned long long)lu->ne->guid, 2086 lu->ud->directory_id, ORB_SET_LUN(lu->lun)); 2087 else 2088 return sprintf(buf, "%016Lx:%d:%d\n", 2089 (unsigned long long)lu->ne->guid, 2090 lu->ud->id, ORB_SET_LUN(lu->lun)); 2091} 2092 2093MODULE_AUTHOR("Ben Collins <bcollins@debian.org>"); 2094MODULE_DESCRIPTION("IEEE-1394 SBP-2 protocol driver"); 2095MODULE_SUPPORTED_DEVICE(SBP2_DEVICE_NAME); 2096MODULE_LICENSE("GPL"); 2097 2098static int sbp2_module_init(void) 2099{ 2100 int ret; 2101 2102 if (sbp2_serialize_io) { 2103 sbp2_shost_template.can_queue = 1; 2104 sbp2_shost_template.cmd_per_lun = 1; 2105 } 2106 2107 if (sbp2_default_workarounds & SBP2_WORKAROUND_128K_MAX_TRANS && 2108 (sbp2_max_sectors * 512) > (128 * 1024)) 2109 sbp2_max_sectors = 128 * 1024 / 512; 2110 sbp2_shost_template.max_sectors = sbp2_max_sectors; 2111 2112 hpsb_register_highlevel(&sbp2_highlevel); 2113 ret = hpsb_register_protocol(&sbp2_driver); 2114 if (ret) { 2115 SBP2_ERR("Failed to register protocol"); 2116 hpsb_unregister_highlevel(&sbp2_highlevel); 2117 return ret; 2118 } 2119 return 0; 2120} 2121 2122static void __exit sbp2_module_exit(void) 2123{ 2124 hpsb_unregister_protocol(&sbp2_driver); 2125 hpsb_unregister_highlevel(&sbp2_highlevel); 2126} 2127 2128module_init(sbp2_module_init); 2129module_exit(sbp2_module_exit); 2130