| 1 | /* |
| 2 | * SBP2 driver (SCSI over IEEE1394) |
| 3 | * |
| 4 | * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software Foundation, |
| 18 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 19 | */ |
| 20 | |
| 21 | /* |
| 22 | * The basic structure of this driver is based on the old storage driver, |
| 23 | * drivers/ieee1394/sbp2.c, originally written by |
| 24 | * James Goodwin <jamesg@filanet.com> |
| 25 | * with later contributions and ongoing maintenance from |
| 26 | * Ben Collins <bcollins@debian.org>, |
| 27 | * Stefan Richter <stefanr@s5r6.in-berlin.de> |
| 28 | * and many others. |
| 29 | */ |
| 30 | |
| 31 | #include <linux/blkdev.h> |
| 32 | #include <linux/bug.h> |
| 33 | #include <linux/completion.h> |
| 34 | #include <linux/delay.h> |
| 35 | #include <linux/device.h> |
| 36 | #include <linux/dma-mapping.h> |
| 37 | #include <linux/firewire.h> |
| 38 | #include <linux/firewire-constants.h> |
| 39 | #include <linux/init.h> |
| 40 | #include <linux/jiffies.h> |
| 41 | #include <linux/kernel.h> |
| 42 | #include <linux/kref.h> |
| 43 | #include <linux/list.h> |
| 44 | #include <linux/mod_devicetable.h> |
| 45 | #include <linux/module.h> |
| 46 | #include <linux/moduleparam.h> |
| 47 | #include <linux/scatterlist.h> |
| 48 | #include <linux/slab.h> |
| 49 | #include <linux/spinlock.h> |
| 50 | #include <linux/string.h> |
| 51 | #include <linux/stringify.h> |
| 52 | #include <linux/workqueue.h> |
| 53 | |
| 54 | #include <asm/byteorder.h> |
| 55 | |
| 56 | #include <scsi/scsi.h> |
| 57 | #include <scsi/scsi_cmnd.h> |
| 58 | #include <scsi/scsi_device.h> |
| 59 | #include <scsi/scsi_host.h> |
| 60 | |
| 61 | /* |
| 62 | * So far only bridges from Oxford Semiconductor are known to support |
| 63 | * concurrent logins. Depending on firmware, four or two concurrent logins |
| 64 | * are possible on OXFW911 and newer Oxsemi bridges. |
| 65 | * |
| 66 | * Concurrent logins are useful together with cluster filesystems. |
| 67 | */ |
| 68 | static bool sbp2_param_exclusive_login = 1; |
| 69 | module_param_named(exclusive_login, sbp2_param_exclusive_login, bool, 0644); |
| 70 | MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device " |
| 71 | "(default = Y, use N for concurrent initiators)"); |
| 72 | |
| 73 | /* |
| 74 | * Flags for firmware oddities |
| 75 | * |
| 76 | * - 128kB max transfer |
| 77 | * Limit transfer size. Necessary for some old bridges. |
| 78 | * |
| 79 | * - 36 byte inquiry |
| 80 | * When scsi_mod probes the device, let the inquiry command look like that |
| 81 | * from MS Windows. |
| 82 | * |
| 83 | * - skip mode page 8 |
| 84 | * Suppress sending of mode_sense for mode page 8 if the device pretends to |
| 85 | * support the SCSI Primary Block commands instead of Reduced Block Commands. |
| 86 | * |
| 87 | * - fix capacity |
| 88 | * Tell sd_mod to correct the last sector number reported by read_capacity. |
| 89 | * Avoids access beyond actual disk limits on devices with an off-by-one bug. |
| 90 | * Don't use this with devices which don't have this bug. |
| 91 | * |
| 92 | * - delay inquiry |
| 93 | * Wait extra SBP2_INQUIRY_DELAY seconds after login before SCSI inquiry. |
| 94 | * |
| 95 | * - power condition |
| 96 | * Set the power condition field in the START STOP UNIT commands sent by |
| 97 | * sd_mod on suspend, resume, and shutdown (if manage_start_stop is on). |
| 98 | * Some disks need this to spin down or to resume properly. |
| 99 | * |
| 100 | * - override internal blacklist |
| 101 | * Instead of adding to the built-in blacklist, use only the workarounds |
| 102 | * specified in the module load parameter. |
| 103 | * Useful if a blacklist entry interfered with a non-broken device. |
| 104 | */ |
| 105 | #define SBP2_WORKAROUND_128K_MAX_TRANS 0x1 |
| 106 | #define SBP2_WORKAROUND_INQUIRY_36 0x2 |
| 107 | #define SBP2_WORKAROUND_MODE_SENSE_8 0x4 |
| 108 | #define SBP2_WORKAROUND_FIX_CAPACITY 0x8 |
| 109 | #define SBP2_WORKAROUND_DELAY_INQUIRY 0x10 |
| 110 | #define SBP2_INQUIRY_DELAY 12 |
| 111 | #define SBP2_WORKAROUND_POWER_CONDITION 0x20 |
| 112 | #define SBP2_WORKAROUND_OVERRIDE 0x100 |
| 113 | |
| 114 | static int sbp2_param_workarounds; |
| 115 | module_param_named(workarounds, sbp2_param_workarounds, int, 0644); |
| 116 | MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0" |
| 117 | ", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS) |
| 118 | ", 36 byte inquiry = " __stringify(SBP2_WORKAROUND_INQUIRY_36) |
| 119 | ", skip mode page 8 = " __stringify(SBP2_WORKAROUND_MODE_SENSE_8) |
| 120 | ", fix capacity = " __stringify(SBP2_WORKAROUND_FIX_CAPACITY) |
| 121 | ", delay inquiry = " __stringify(SBP2_WORKAROUND_DELAY_INQUIRY) |
| 122 | ", set power condition in start stop unit = " |
| 123 | __stringify(SBP2_WORKAROUND_POWER_CONDITION) |
| 124 | ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE) |
| 125 | ", or a combination)"); |
| 126 | |
| 127 | /* |
| 128 | * We create one struct sbp2_logical_unit per SBP-2 Logical Unit Number Entry |
| 129 | * and one struct scsi_device per sbp2_logical_unit. |
| 130 | */ |
| 131 | struct sbp2_logical_unit { |
| 132 | struct sbp2_target *tgt; |
| 133 | struct list_head link; |
| 134 | struct fw_address_handler address_handler; |
| 135 | struct list_head orb_list; |
| 136 | |
| 137 | u64 command_block_agent_address; |
| 138 | u16 lun; |
| 139 | int login_id; |
| 140 | |
| 141 | /* |
| 142 | * The generation is updated once we've logged in or reconnected |
| 143 | * to the logical unit. Thus, I/O to the device will automatically |
| 144 | * fail and get retried if it happens in a window where the device |
| 145 | * is not ready, e.g. after a bus reset but before we reconnect. |
| 146 | */ |
| 147 | int generation; |
| 148 | int retries; |
| 149 | work_func_t workfn; |
| 150 | struct delayed_work work; |
| 151 | bool has_sdev; |
| 152 | bool blocked; |
| 153 | }; |
| 154 | |
| 155 | static void sbp2_queue_work(struct sbp2_logical_unit *lu, unsigned long delay) |
| 156 | { |
| 157 | queue_delayed_work(fw_workqueue, &lu->work, delay); |
| 158 | } |
| 159 | |
| 160 | /* |
| 161 | * We create one struct sbp2_target per IEEE 1212 Unit Directory |
| 162 | * and one struct Scsi_Host per sbp2_target. |
| 163 | */ |
| 164 | struct sbp2_target { |
| 165 | struct fw_unit *unit; |
| 166 | struct list_head lu_list; |
| 167 | |
| 168 | u64 management_agent_address; |
| 169 | u64 guid; |
| 170 | int directory_id; |
| 171 | int node_id; |
| 172 | int address_high; |
| 173 | unsigned int workarounds; |
| 174 | unsigned int mgt_orb_timeout; |
| 175 | unsigned int max_payload; |
| 176 | |
| 177 | spinlock_t lock; |
| 178 | int dont_block; /* counter for each logical unit */ |
| 179 | int blocked; /* ditto */ |
| 180 | }; |
| 181 | |
| 182 | static struct fw_device *target_parent_device(struct sbp2_target *tgt) |
| 183 | { |
| 184 | return fw_parent_device(tgt->unit); |
| 185 | } |
| 186 | |
| 187 | static const struct device *tgt_dev(const struct sbp2_target *tgt) |
| 188 | { |
| 189 | return &tgt->unit->device; |
| 190 | } |
| 191 | |
| 192 | static const struct device *lu_dev(const struct sbp2_logical_unit *lu) |
| 193 | { |
| 194 | return &lu->tgt->unit->device; |
| 195 | } |
| 196 | |
| 197 | /* Impossible login_id, to detect logout attempt before successful login */ |
| 198 | #define INVALID_LOGIN_ID 0x10000 |
| 199 | |
| 200 | #define SBP2_ORB_TIMEOUT 2000U /* Timeout in ms */ |
| 201 | #define SBP2_ORB_NULL 0x80000000 |
| 202 | #define SBP2_RETRY_LIMIT 0xf /* 15 retries */ |
| 203 | #define SBP2_CYCLE_LIMIT (0xc8 << 12) /* 200 125us cycles */ |
| 204 | |
| 205 | /* |
| 206 | * There is no transport protocol limit to the CDB length, but we implement |
| 207 | * a fixed length only. 16 bytes is enough for disks larger than 2 TB. |
| 208 | */ |
| 209 | #define SBP2_MAX_CDB_SIZE 16 |
| 210 | |
| 211 | /* |
| 212 | * The maximum SBP-2 data buffer size is 0xffff. We quadlet-align this |
| 213 | * for compatibility with earlier versions of this driver. |
| 214 | */ |
| 215 | #define SBP2_MAX_SEG_SIZE 0xfffc |
| 216 | |
| 217 | /* Unit directory keys */ |
| 218 | #define SBP2_CSR_UNIT_CHARACTERISTICS 0x3a |
| 219 | #define SBP2_CSR_FIRMWARE_REVISION 0x3c |
| 220 | #define SBP2_CSR_LOGICAL_UNIT_NUMBER 0x14 |
| 221 | #define SBP2_CSR_UNIT_UNIQUE_ID 0x8d |
| 222 | #define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4 |
| 223 | |
| 224 | /* Management orb opcodes */ |
| 225 | #define SBP2_LOGIN_REQUEST 0x0 |
| 226 | #define SBP2_QUERY_LOGINS_REQUEST 0x1 |
| 227 | #define SBP2_RECONNECT_REQUEST 0x3 |
| 228 | #define SBP2_SET_PASSWORD_REQUEST 0x4 |
| 229 | #define SBP2_LOGOUT_REQUEST 0x7 |
| 230 | #define SBP2_ABORT_TASK_REQUEST 0xb |
| 231 | #define SBP2_ABORT_TASK_SET 0xc |
| 232 | #define SBP2_LOGICAL_UNIT_RESET 0xe |
| 233 | #define SBP2_TARGET_RESET_REQUEST 0xf |
| 234 | |
| 235 | /* Offsets for command block agent registers */ |
| 236 | #define SBP2_AGENT_STATE 0x00 |
| 237 | #define SBP2_AGENT_RESET 0x04 |
| 238 | #define SBP2_ORB_POINTER 0x08 |
| 239 | #define SBP2_DOORBELL 0x10 |
| 240 | #define SBP2_UNSOLICITED_STATUS_ENABLE 0x14 |
| 241 | |
| 242 | /* Status write response codes */ |
| 243 | #define SBP2_STATUS_REQUEST_COMPLETE 0x0 |
| 244 | #define SBP2_STATUS_TRANSPORT_FAILURE 0x1 |
| 245 | #define SBP2_STATUS_ILLEGAL_REQUEST 0x2 |
| 246 | #define SBP2_STATUS_VENDOR_DEPENDENT 0x3 |
| 247 | |
| 248 | #define STATUS_GET_ORB_HIGH(v) ((v).status & 0xffff) |
| 249 | #define STATUS_GET_SBP_STATUS(v) (((v).status >> 16) & 0xff) |
| 250 | #define STATUS_GET_LEN(v) (((v).status >> 24) & 0x07) |
| 251 | #define STATUS_GET_DEAD(v) (((v).status >> 27) & 0x01) |
| 252 | #define STATUS_GET_RESPONSE(v) (((v).status >> 28) & 0x03) |
| 253 | #define STATUS_GET_SOURCE(v) (((v).status >> 30) & 0x03) |
| 254 | #define STATUS_GET_ORB_LOW(v) ((v).orb_low) |
| 255 | #define STATUS_GET_DATA(v) ((v).data) |
| 256 | |
| 257 | struct sbp2_status { |
| 258 | u32 status; |
| 259 | u32 orb_low; |
| 260 | u8 data[24]; |
| 261 | }; |
| 262 | |
| 263 | struct sbp2_pointer { |
| 264 | __be32 high; |
| 265 | __be32 low; |
| 266 | }; |
| 267 | |
| 268 | struct sbp2_orb { |
| 269 | struct fw_transaction t; |
| 270 | struct kref kref; |
| 271 | dma_addr_t request_bus; |
| 272 | int rcode; |
| 273 | void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status); |
| 274 | struct sbp2_logical_unit *lu; |
| 275 | struct list_head link; |
| 276 | }; |
| 277 | |
| 278 | #define MANAGEMENT_ORB_LUN(v) ((v)) |
| 279 | #define MANAGEMENT_ORB_FUNCTION(v) ((v) << 16) |
| 280 | #define MANAGEMENT_ORB_RECONNECT(v) ((v) << 20) |
| 281 | #define MANAGEMENT_ORB_EXCLUSIVE(v) ((v) ? 1 << 28 : 0) |
| 282 | #define MANAGEMENT_ORB_REQUEST_FORMAT(v) ((v) << 29) |
| 283 | #define MANAGEMENT_ORB_NOTIFY ((1) << 31) |
| 284 | |
| 285 | #define MANAGEMENT_ORB_RESPONSE_LENGTH(v) ((v)) |
| 286 | #define MANAGEMENT_ORB_PASSWORD_LENGTH(v) ((v) << 16) |
| 287 | |
| 288 | struct sbp2_management_orb { |
| 289 | struct sbp2_orb base; |
| 290 | struct { |
| 291 | struct sbp2_pointer password; |
| 292 | struct sbp2_pointer response; |
| 293 | __be32 misc; |
| 294 | __be32 length; |
| 295 | struct sbp2_pointer status_fifo; |
| 296 | } request; |
| 297 | __be32 response[4]; |
| 298 | dma_addr_t response_bus; |
| 299 | struct completion done; |
| 300 | struct sbp2_status status; |
| 301 | }; |
| 302 | |
| 303 | struct sbp2_login_response { |
| 304 | __be32 misc; |
| 305 | struct sbp2_pointer command_block_agent; |
| 306 | __be32 reconnect_hold; |
| 307 | }; |
| 308 | #define COMMAND_ORB_DATA_SIZE(v) ((v)) |
| 309 | #define COMMAND_ORB_PAGE_SIZE(v) ((v) << 16) |
| 310 | #define COMMAND_ORB_PAGE_TABLE_PRESENT ((1) << 19) |
| 311 | #define COMMAND_ORB_MAX_PAYLOAD(v) ((v) << 20) |
| 312 | #define COMMAND_ORB_SPEED(v) ((v) << 24) |
| 313 | #define COMMAND_ORB_DIRECTION ((1) << 27) |
| 314 | #define COMMAND_ORB_REQUEST_FORMAT(v) ((v) << 29) |
| 315 | #define COMMAND_ORB_NOTIFY ((1) << 31) |
| 316 | |
| 317 | struct sbp2_command_orb { |
| 318 | struct sbp2_orb base; |
| 319 | struct { |
| 320 | struct sbp2_pointer next; |
| 321 | struct sbp2_pointer data_descriptor; |
| 322 | __be32 misc; |
| 323 | u8 command_block[SBP2_MAX_CDB_SIZE]; |
| 324 | } request; |
| 325 | struct scsi_cmnd *cmd; |
| 326 | |
| 327 | struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8))); |
| 328 | dma_addr_t page_table_bus; |
| 329 | }; |
| 330 | |
| 331 | #define SBP2_ROM_VALUE_WILDCARD ~0 /* match all */ |
| 332 | #define SBP2_ROM_VALUE_MISSING 0xff000000 /* not present in the unit dir. */ |
| 333 | |
| 334 | /* |
| 335 | * List of devices with known bugs. |
| 336 | * |
| 337 | * The firmware_revision field, masked with 0xffff00, is the best |
| 338 | * indicator for the type of bridge chip of a device. It yields a few |
| 339 | * false positives but this did not break correctly behaving devices |
| 340 | * so far. |
| 341 | */ |
| 342 | static const struct { |
| 343 | u32 firmware_revision; |
| 344 | u32 model; |
| 345 | unsigned int workarounds; |
| 346 | } sbp2_workarounds_table[] = { |
| 347 | /* DViCO Momobay CX-1 with TSB42AA9 bridge */ { |
| 348 | .firmware_revision = 0x002800, |
| 349 | .model = 0x001010, |
| 350 | .workarounds = SBP2_WORKAROUND_INQUIRY_36 | |
| 351 | SBP2_WORKAROUND_MODE_SENSE_8 | |
| 352 | SBP2_WORKAROUND_POWER_CONDITION, |
| 353 | }, |
| 354 | /* DViCO Momobay FX-3A with TSB42AA9A bridge */ { |
| 355 | .firmware_revision = 0x002800, |
| 356 | .model = 0x000000, |
| 357 | .workarounds = SBP2_WORKAROUND_POWER_CONDITION, |
| 358 | }, |
| 359 | /* Initio bridges, actually only needed for some older ones */ { |
| 360 | .firmware_revision = 0x000200, |
| 361 | .model = SBP2_ROM_VALUE_WILDCARD, |
| 362 | .workarounds = SBP2_WORKAROUND_INQUIRY_36, |
| 363 | }, |
| 364 | /* PL-3507 bridge with Prolific firmware */ { |
| 365 | .firmware_revision = 0x012800, |
| 366 | .model = SBP2_ROM_VALUE_WILDCARD, |
| 367 | .workarounds = SBP2_WORKAROUND_POWER_CONDITION, |
| 368 | }, |
| 369 | /* Symbios bridge */ { |
| 370 | .firmware_revision = 0xa0b800, |
| 371 | .model = SBP2_ROM_VALUE_WILDCARD, |
| 372 | .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, |
| 373 | }, |
| 374 | /* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ { |
| 375 | .firmware_revision = 0x002600, |
| 376 | .model = SBP2_ROM_VALUE_WILDCARD, |
| 377 | .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, |
| 378 | }, |
| 379 | /* |
| 380 | * iPod 2nd generation: needs 128k max transfer size workaround |
| 381 | * iPod 3rd generation: needs fix capacity workaround |
| 382 | */ |
| 383 | { |
| 384 | .firmware_revision = 0x0a2700, |
| 385 | .model = 0x000000, |
| 386 | .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS | |
| 387 | SBP2_WORKAROUND_FIX_CAPACITY, |
| 388 | }, |
| 389 | /* iPod 4th generation */ { |
| 390 | .firmware_revision = 0x0a2700, |
| 391 | .model = 0x000021, |
| 392 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, |
| 393 | }, |
| 394 | /* iPod mini */ { |
| 395 | .firmware_revision = 0x0a2700, |
| 396 | .model = 0x000022, |
| 397 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, |
| 398 | }, |
| 399 | /* iPod mini */ { |
| 400 | .firmware_revision = 0x0a2700, |
| 401 | .model = 0x000023, |
| 402 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, |
| 403 | }, |
| 404 | /* iPod Photo */ { |
| 405 | .firmware_revision = 0x0a2700, |
| 406 | .model = 0x00007e, |
| 407 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, |
| 408 | } |
| 409 | }; |
| 410 | |
| 411 | static void free_orb(struct kref *kref) |
| 412 | { |
| 413 | struct sbp2_orb *orb = container_of(kref, struct sbp2_orb, kref); |
| 414 | |
| 415 | kfree(orb); |
| 416 | } |
| 417 | |
| 418 | static void sbp2_status_write(struct fw_card *card, struct fw_request *request, |
| 419 | int tcode, int destination, int source, |
| 420 | int generation, unsigned long long offset, |
| 421 | void *payload, size_t length, void *callback_data) |
| 422 | { |
| 423 | struct sbp2_logical_unit *lu = callback_data; |
| 424 | struct sbp2_orb *orb; |
| 425 | struct sbp2_status status; |
| 426 | unsigned long flags; |
| 427 | |
| 428 | if (tcode != TCODE_WRITE_BLOCK_REQUEST || |
| 429 | length < 8 || length > sizeof(status)) { |
| 430 | fw_send_response(card, request, RCODE_TYPE_ERROR); |
| 431 | return; |
| 432 | } |
| 433 | |
| 434 | status.status = be32_to_cpup(payload); |
| 435 | status.orb_low = be32_to_cpup(payload + 4); |
| 436 | memset(status.data, 0, sizeof(status.data)); |
| 437 | if (length > 8) |
| 438 | memcpy(status.data, payload + 8, length - 8); |
| 439 | |
| 440 | if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) { |
| 441 | dev_notice(lu_dev(lu), |
| 442 | "non-ORB related status write, not handled\n"); |
| 443 | fw_send_response(card, request, RCODE_COMPLETE); |
| 444 | return; |
| 445 | } |
| 446 | |
| 447 | /* Lookup the orb corresponding to this status write. */ |
| 448 | spin_lock_irqsave(&lu->tgt->lock, flags); |
| 449 | list_for_each_entry(orb, &lu->orb_list, link) { |
| 450 | if (STATUS_GET_ORB_HIGH(status) == 0 && |
| 451 | STATUS_GET_ORB_LOW(status) == orb->request_bus) { |
| 452 | orb->rcode = RCODE_COMPLETE; |
| 453 | list_del(&orb->link); |
| 454 | break; |
| 455 | } |
| 456 | } |
| 457 | spin_unlock_irqrestore(&lu->tgt->lock, flags); |
| 458 | |
| 459 | if (&orb->link != &lu->orb_list) { |
| 460 | orb->callback(orb, &status); |
| 461 | kref_put(&orb->kref, free_orb); /* orb callback reference */ |
| 462 | } else { |
| 463 | dev_err(lu_dev(lu), "status write for unknown ORB\n"); |
| 464 | } |
| 465 | |
| 466 | fw_send_response(card, request, RCODE_COMPLETE); |
| 467 | } |
| 468 | |
| 469 | static void complete_transaction(struct fw_card *card, int rcode, |
| 470 | void *payload, size_t length, void *data) |
| 471 | { |
| 472 | struct sbp2_orb *orb = data; |
| 473 | unsigned long flags; |
| 474 | |
| 475 | /* |
| 476 | * This is a little tricky. We can get the status write for |
| 477 | * the orb before we get this callback. The status write |
| 478 | * handler above will assume the orb pointer transaction was |
| 479 | * successful and set the rcode to RCODE_COMPLETE for the orb. |
| 480 | * So this callback only sets the rcode if it hasn't already |
| 481 | * been set and only does the cleanup if the transaction |
| 482 | * failed and we didn't already get a status write. |
| 483 | */ |
| 484 | spin_lock_irqsave(&orb->lu->tgt->lock, flags); |
| 485 | |
| 486 | if (orb->rcode == -1) |
| 487 | orb->rcode = rcode; |
| 488 | if (orb->rcode != RCODE_COMPLETE) { |
| 489 | list_del(&orb->link); |
| 490 | spin_unlock_irqrestore(&orb->lu->tgt->lock, flags); |
| 491 | |
| 492 | orb->callback(orb, NULL); |
| 493 | kref_put(&orb->kref, free_orb); /* orb callback reference */ |
| 494 | } else { |
| 495 | spin_unlock_irqrestore(&orb->lu->tgt->lock, flags); |
| 496 | } |
| 497 | |
| 498 | kref_put(&orb->kref, free_orb); /* transaction callback reference */ |
| 499 | } |
| 500 | |
| 501 | static void sbp2_send_orb(struct sbp2_orb *orb, struct sbp2_logical_unit *lu, |
| 502 | int node_id, int generation, u64 offset) |
| 503 | { |
| 504 | struct fw_device *device = target_parent_device(lu->tgt); |
| 505 | struct sbp2_pointer orb_pointer; |
| 506 | unsigned long flags; |
| 507 | |
| 508 | orb_pointer.high = 0; |
| 509 | orb_pointer.low = cpu_to_be32(orb->request_bus); |
| 510 | |
| 511 | orb->lu = lu; |
| 512 | spin_lock_irqsave(&lu->tgt->lock, flags); |
| 513 | list_add_tail(&orb->link, &lu->orb_list); |
| 514 | spin_unlock_irqrestore(&lu->tgt->lock, flags); |
| 515 | |
| 516 | kref_get(&orb->kref); /* transaction callback reference */ |
| 517 | kref_get(&orb->kref); /* orb callback reference */ |
| 518 | |
| 519 | fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST, |
| 520 | node_id, generation, device->max_speed, offset, |
| 521 | &orb_pointer, 8, complete_transaction, orb); |
| 522 | } |
| 523 | |
| 524 | static int sbp2_cancel_orbs(struct sbp2_logical_unit *lu) |
| 525 | { |
| 526 | struct fw_device *device = target_parent_device(lu->tgt); |
| 527 | struct sbp2_orb *orb, *next; |
| 528 | struct list_head list; |
| 529 | int retval = -ENOENT; |
| 530 | |
| 531 | INIT_LIST_HEAD(&list); |
| 532 | spin_lock_irq(&lu->tgt->lock); |
| 533 | list_splice_init(&lu->orb_list, &list); |
| 534 | spin_unlock_irq(&lu->tgt->lock); |
| 535 | |
| 536 | list_for_each_entry_safe(orb, next, &list, link) { |
| 537 | retval = 0; |
| 538 | if (fw_cancel_transaction(device->card, &orb->t) == 0) |
| 539 | continue; |
| 540 | |
| 541 | orb->rcode = RCODE_CANCELLED; |
| 542 | orb->callback(orb, NULL); |
| 543 | kref_put(&orb->kref, free_orb); /* orb callback reference */ |
| 544 | } |
| 545 | |
| 546 | return retval; |
| 547 | } |
| 548 | |
| 549 | static void complete_management_orb(struct sbp2_orb *base_orb, |
| 550 | struct sbp2_status *status) |
| 551 | { |
| 552 | struct sbp2_management_orb *orb = |
| 553 | container_of(base_orb, struct sbp2_management_orb, base); |
| 554 | |
| 555 | if (status) |
| 556 | memcpy(&orb->status, status, sizeof(*status)); |
| 557 | complete(&orb->done); |
| 558 | } |
| 559 | |
| 560 | static int sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id, |
| 561 | int generation, int function, |
| 562 | int lun_or_login_id, void *response) |
| 563 | { |
| 564 | struct fw_device *device = target_parent_device(lu->tgt); |
| 565 | struct sbp2_management_orb *orb; |
| 566 | unsigned int timeout; |
| 567 | int retval = -ENOMEM; |
| 568 | |
| 569 | if (function == SBP2_LOGOUT_REQUEST && fw_device_is_shutdown(device)) |
| 570 | return 0; |
| 571 | |
| 572 | orb = kzalloc(sizeof(*orb), GFP_NOIO); |
| 573 | if (orb == NULL) |
| 574 | return -ENOMEM; |
| 575 | |
| 576 | kref_init(&orb->base.kref); |
| 577 | orb->response_bus = |
| 578 | dma_map_single(device->card->device, &orb->response, |
| 579 | sizeof(orb->response), DMA_FROM_DEVICE); |
| 580 | if (dma_mapping_error(device->card->device, orb->response_bus)) |
| 581 | goto fail_mapping_response; |
| 582 | |
| 583 | orb->request.response.high = 0; |
| 584 | orb->request.response.low = cpu_to_be32(orb->response_bus); |
| 585 | |
| 586 | orb->request.misc = cpu_to_be32( |
| 587 | MANAGEMENT_ORB_NOTIFY | |
| 588 | MANAGEMENT_ORB_FUNCTION(function) | |
| 589 | MANAGEMENT_ORB_LUN(lun_or_login_id)); |
| 590 | orb->request.length = cpu_to_be32( |
| 591 | MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response))); |
| 592 | |
| 593 | orb->request.status_fifo.high = |
| 594 | cpu_to_be32(lu->address_handler.offset >> 32); |
| 595 | orb->request.status_fifo.low = |
| 596 | cpu_to_be32(lu->address_handler.offset); |
| 597 | |
| 598 | if (function == SBP2_LOGIN_REQUEST) { |
| 599 | /* Ask for 2^2 == 4 seconds reconnect grace period */ |
| 600 | orb->request.misc |= cpu_to_be32( |
| 601 | MANAGEMENT_ORB_RECONNECT(2) | |
| 602 | MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login)); |
| 603 | timeout = lu->tgt->mgt_orb_timeout; |
| 604 | } else { |
| 605 | timeout = SBP2_ORB_TIMEOUT; |
| 606 | } |
| 607 | |
| 608 | init_completion(&orb->done); |
| 609 | orb->base.callback = complete_management_orb; |
| 610 | |
| 611 | orb->base.request_bus = |
| 612 | dma_map_single(device->card->device, &orb->request, |
| 613 | sizeof(orb->request), DMA_TO_DEVICE); |
| 614 | if (dma_mapping_error(device->card->device, orb->base.request_bus)) |
| 615 | goto fail_mapping_request; |
| 616 | |
| 617 | sbp2_send_orb(&orb->base, lu, node_id, generation, |
| 618 | lu->tgt->management_agent_address); |
| 619 | |
| 620 | wait_for_completion_timeout(&orb->done, msecs_to_jiffies(timeout)); |
| 621 | |
| 622 | retval = -EIO; |
| 623 | if (sbp2_cancel_orbs(lu) == 0) { |
| 624 | dev_err(lu_dev(lu), "ORB reply timed out, rcode 0x%02x\n", |
| 625 | orb->base.rcode); |
| 626 | goto out; |
| 627 | } |
| 628 | |
| 629 | if (orb->base.rcode != RCODE_COMPLETE) { |
| 630 | dev_err(lu_dev(lu), "management write failed, rcode 0x%02x\n", |
| 631 | orb->base.rcode); |
| 632 | goto out; |
| 633 | } |
| 634 | |
| 635 | if (STATUS_GET_RESPONSE(orb->status) != 0 || |
| 636 | STATUS_GET_SBP_STATUS(orb->status) != 0) { |
| 637 | dev_err(lu_dev(lu), "error status: %d:%d\n", |
| 638 | STATUS_GET_RESPONSE(orb->status), |
| 639 | STATUS_GET_SBP_STATUS(orb->status)); |
| 640 | goto out; |
| 641 | } |
| 642 | |
| 643 | retval = 0; |
| 644 | out: |
| 645 | dma_unmap_single(device->card->device, orb->base.request_bus, |
| 646 | sizeof(orb->request), DMA_TO_DEVICE); |
| 647 | fail_mapping_request: |
| 648 | dma_unmap_single(device->card->device, orb->response_bus, |
| 649 | sizeof(orb->response), DMA_FROM_DEVICE); |
| 650 | fail_mapping_response: |
| 651 | if (response) |
| 652 | memcpy(response, orb->response, sizeof(orb->response)); |
| 653 | kref_put(&orb->base.kref, free_orb); |
| 654 | |
| 655 | return retval; |
| 656 | } |
| 657 | |
| 658 | static void sbp2_agent_reset(struct sbp2_logical_unit *lu) |
| 659 | { |
| 660 | struct fw_device *device = target_parent_device(lu->tgt); |
| 661 | __be32 d = 0; |
| 662 | |
| 663 | fw_run_transaction(device->card, TCODE_WRITE_QUADLET_REQUEST, |
| 664 | lu->tgt->node_id, lu->generation, device->max_speed, |
| 665 | lu->command_block_agent_address + SBP2_AGENT_RESET, |
| 666 | &d, 4); |
| 667 | } |
| 668 | |
| 669 | static void complete_agent_reset_write_no_wait(struct fw_card *card, |
| 670 | int rcode, void *payload, size_t length, void *data) |
| 671 | { |
| 672 | kfree(data); |
| 673 | } |
| 674 | |
| 675 | static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu) |
| 676 | { |
| 677 | struct fw_device *device = target_parent_device(lu->tgt); |
| 678 | struct fw_transaction *t; |
| 679 | static __be32 d; |
| 680 | |
| 681 | t = kmalloc(sizeof(*t), GFP_ATOMIC); |
| 682 | if (t == NULL) |
| 683 | return; |
| 684 | |
| 685 | fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST, |
| 686 | lu->tgt->node_id, lu->generation, device->max_speed, |
| 687 | lu->command_block_agent_address + SBP2_AGENT_RESET, |
| 688 | &d, 4, complete_agent_reset_write_no_wait, t); |
| 689 | } |
| 690 | |
| 691 | static inline void sbp2_allow_block(struct sbp2_target *tgt) |
| 692 | { |
| 693 | spin_lock_irq(&tgt->lock); |
| 694 | --tgt->dont_block; |
| 695 | spin_unlock_irq(&tgt->lock); |
| 696 | } |
| 697 | |
| 698 | /* |
| 699 | * Blocks lu->tgt if all of the following conditions are met: |
| 700 | * - Login, INQUIRY, and high-level SCSI setup of all of the target's |
| 701 | * logical units have been finished (indicated by dont_block == 0). |
| 702 | * - lu->generation is stale. |
| 703 | * |
| 704 | * Note, scsi_block_requests() must be called while holding tgt->lock, |
| 705 | * otherwise it might foil sbp2_[conditionally_]unblock()'s attempt to |
| 706 | * unblock the target. |
| 707 | */ |
| 708 | static void sbp2_conditionally_block(struct sbp2_logical_unit *lu) |
| 709 | { |
| 710 | struct sbp2_target *tgt = lu->tgt; |
| 711 | struct fw_card *card = target_parent_device(tgt)->card; |
| 712 | struct Scsi_Host *shost = |
| 713 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
| 714 | unsigned long flags; |
| 715 | |
| 716 | spin_lock_irqsave(&tgt->lock, flags); |
| 717 | if (!tgt->dont_block && !lu->blocked && |
| 718 | lu->generation != card->generation) { |
| 719 | lu->blocked = true; |
| 720 | if (++tgt->blocked == 1) |
| 721 | scsi_block_requests(shost); |
| 722 | } |
| 723 | spin_unlock_irqrestore(&tgt->lock, flags); |
| 724 | } |
| 725 | |
| 726 | /* |
| 727 | * Unblocks lu->tgt as soon as all its logical units can be unblocked. |
| 728 | * Note, it is harmless to run scsi_unblock_requests() outside the |
| 729 | * tgt->lock protected section. On the other hand, running it inside |
| 730 | * the section might clash with shost->host_lock. |
| 731 | */ |
| 732 | static void sbp2_conditionally_unblock(struct sbp2_logical_unit *lu) |
| 733 | { |
| 734 | struct sbp2_target *tgt = lu->tgt; |
| 735 | struct fw_card *card = target_parent_device(tgt)->card; |
| 736 | struct Scsi_Host *shost = |
| 737 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
| 738 | bool unblock = false; |
| 739 | |
| 740 | spin_lock_irq(&tgt->lock); |
| 741 | if (lu->blocked && lu->generation == card->generation) { |
| 742 | lu->blocked = false; |
| 743 | unblock = --tgt->blocked == 0; |
| 744 | } |
| 745 | spin_unlock_irq(&tgt->lock); |
| 746 | |
| 747 | if (unblock) |
| 748 | scsi_unblock_requests(shost); |
| 749 | } |
| 750 | |
| 751 | /* |
| 752 | * Prevents future blocking of tgt and unblocks it. |
| 753 | * Note, it is harmless to run scsi_unblock_requests() outside the |
| 754 | * tgt->lock protected section. On the other hand, running it inside |
| 755 | * the section might clash with shost->host_lock. |
| 756 | */ |
| 757 | static void sbp2_unblock(struct sbp2_target *tgt) |
| 758 | { |
| 759 | struct Scsi_Host *shost = |
| 760 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
| 761 | |
| 762 | spin_lock_irq(&tgt->lock); |
| 763 | ++tgt->dont_block; |
| 764 | spin_unlock_irq(&tgt->lock); |
| 765 | |
| 766 | scsi_unblock_requests(shost); |
| 767 | } |
| 768 | |
| 769 | static int sbp2_lun2int(u16 lun) |
| 770 | { |
| 771 | struct scsi_lun eight_bytes_lun; |
| 772 | |
| 773 | memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun)); |
| 774 | eight_bytes_lun.scsi_lun[0] = (lun >> 8) & 0xff; |
| 775 | eight_bytes_lun.scsi_lun[1] = lun & 0xff; |
| 776 | |
| 777 | return scsilun_to_int(&eight_bytes_lun); |
| 778 | } |
| 779 | |
| 780 | /* |
| 781 | * Write retransmit retry values into the BUSY_TIMEOUT register. |
| 782 | * - The single-phase retry protocol is supported by all SBP-2 devices, but the |
| 783 | * default retry_limit value is 0 (i.e. never retry transmission). We write a |
| 784 | * saner value after logging into the device. |
| 785 | * - The dual-phase retry protocol is optional to implement, and if not |
| 786 | * supported, writes to the dual-phase portion of the register will be |
| 787 | * ignored. We try to write the original 1394-1995 default here. |
| 788 | * - In the case of devices that are also SBP-3-compliant, all writes are |
| 789 | * ignored, as the register is read-only, but contains single-phase retry of |
| 790 | * 15, which is what we're trying to set for all SBP-2 device anyway, so this |
| 791 | * write attempt is safe and yields more consistent behavior for all devices. |
| 792 | * |
| 793 | * See section 8.3.2.3.5 of the 1394-1995 spec, section 6.2 of the SBP-2 spec, |
| 794 | * and section 6.4 of the SBP-3 spec for further details. |
| 795 | */ |
| 796 | static void sbp2_set_busy_timeout(struct sbp2_logical_unit *lu) |
| 797 | { |
| 798 | struct fw_device *device = target_parent_device(lu->tgt); |
| 799 | __be32 d = cpu_to_be32(SBP2_CYCLE_LIMIT | SBP2_RETRY_LIMIT); |
| 800 | |
| 801 | fw_run_transaction(device->card, TCODE_WRITE_QUADLET_REQUEST, |
| 802 | lu->tgt->node_id, lu->generation, device->max_speed, |
| 803 | CSR_REGISTER_BASE + CSR_BUSY_TIMEOUT, &d, 4); |
| 804 | } |
| 805 | |
| 806 | static void sbp2_reconnect(struct work_struct *work); |
| 807 | |
| 808 | static void sbp2_login(struct work_struct *work) |
| 809 | { |
| 810 | struct sbp2_logical_unit *lu = |
| 811 | container_of(work, struct sbp2_logical_unit, work.work); |
| 812 | struct sbp2_target *tgt = lu->tgt; |
| 813 | struct fw_device *device = target_parent_device(tgt); |
| 814 | struct Scsi_Host *shost; |
| 815 | struct scsi_device *sdev; |
| 816 | struct sbp2_login_response response; |
| 817 | int generation, node_id, local_node_id; |
| 818 | |
| 819 | if (fw_device_is_shutdown(device)) |
| 820 | return; |
| 821 | |
| 822 | generation = device->generation; |
| 823 | smp_rmb(); /* node IDs must not be older than generation */ |
| 824 | node_id = device->node_id; |
| 825 | local_node_id = device->card->node_id; |
| 826 | |
| 827 | /* If this is a re-login attempt, log out, or we might be rejected. */ |
| 828 | if (lu->has_sdev) |
| 829 | sbp2_send_management_orb(lu, device->node_id, generation, |
| 830 | SBP2_LOGOUT_REQUEST, lu->login_id, NULL); |
| 831 | |
| 832 | if (sbp2_send_management_orb(lu, node_id, generation, |
| 833 | SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) { |
| 834 | if (lu->retries++ < 5) { |
| 835 | sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5)); |
| 836 | } else { |
| 837 | dev_err(tgt_dev(tgt), "failed to login to LUN %04x\n", |
| 838 | lu->lun); |
| 839 | /* Let any waiting I/O fail from now on. */ |
| 840 | sbp2_unblock(lu->tgt); |
| 841 | } |
| 842 | return; |
| 843 | } |
| 844 | |
| 845 | tgt->node_id = node_id; |
| 846 | tgt->address_high = local_node_id << 16; |
| 847 | smp_wmb(); /* node IDs must not be older than generation */ |
| 848 | lu->generation = generation; |
| 849 | |
| 850 | lu->command_block_agent_address = |
| 851 | ((u64)(be32_to_cpu(response.command_block_agent.high) & 0xffff) |
| 852 | << 32) | be32_to_cpu(response.command_block_agent.low); |
| 853 | lu->login_id = be32_to_cpu(response.misc) & 0xffff; |
| 854 | |
| 855 | dev_notice(tgt_dev(tgt), "logged in to LUN %04x (%d retries)\n", |
| 856 | lu->lun, lu->retries); |
| 857 | |
| 858 | /* set appropriate retry limit(s) in BUSY_TIMEOUT register */ |
| 859 | sbp2_set_busy_timeout(lu); |
| 860 | |
| 861 | lu->workfn = sbp2_reconnect; |
| 862 | sbp2_agent_reset(lu); |
| 863 | |
| 864 | /* This was a re-login. */ |
| 865 | if (lu->has_sdev) { |
| 866 | sbp2_cancel_orbs(lu); |
| 867 | sbp2_conditionally_unblock(lu); |
| 868 | |
| 869 | return; |
| 870 | } |
| 871 | |
| 872 | if (lu->tgt->workarounds & SBP2_WORKAROUND_DELAY_INQUIRY) |
| 873 | ssleep(SBP2_INQUIRY_DELAY); |
| 874 | |
| 875 | shost = container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
| 876 | sdev = __scsi_add_device(shost, 0, 0, sbp2_lun2int(lu->lun), lu); |
| 877 | /* |
| 878 | * FIXME: We are unable to perform reconnects while in sbp2_login(). |
| 879 | * Therefore __scsi_add_device() will get into trouble if a bus reset |
| 880 | * happens in parallel. It will either fail or leave us with an |
| 881 | * unusable sdev. As a workaround we check for this and retry the |
| 882 | * whole login and SCSI probing. |
| 883 | */ |
| 884 | |
| 885 | /* Reported error during __scsi_add_device() */ |
| 886 | if (IS_ERR(sdev)) |
| 887 | goto out_logout_login; |
| 888 | |
| 889 | /* Unreported error during __scsi_add_device() */ |
| 890 | smp_rmb(); /* get current card generation */ |
| 891 | if (generation != device->card->generation) { |
| 892 | scsi_remove_device(sdev); |
| 893 | scsi_device_put(sdev); |
| 894 | goto out_logout_login; |
| 895 | } |
| 896 | |
| 897 | /* No error during __scsi_add_device() */ |
| 898 | lu->has_sdev = true; |
| 899 | scsi_device_put(sdev); |
| 900 | sbp2_allow_block(tgt); |
| 901 | |
| 902 | return; |
| 903 | |
| 904 | out_logout_login: |
| 905 | smp_rmb(); /* generation may have changed */ |
| 906 | generation = device->generation; |
| 907 | smp_rmb(); /* node_id must not be older than generation */ |
| 908 | |
| 909 | sbp2_send_management_orb(lu, device->node_id, generation, |
| 910 | SBP2_LOGOUT_REQUEST, lu->login_id, NULL); |
| 911 | /* |
| 912 | * If a bus reset happened, sbp2_update will have requeued |
| 913 | * lu->work already. Reset the work from reconnect to login. |
| 914 | */ |
| 915 | lu->workfn = sbp2_login; |
| 916 | } |
| 917 | |
| 918 | static void sbp2_reconnect(struct work_struct *work) |
| 919 | { |
| 920 | struct sbp2_logical_unit *lu = |
| 921 | container_of(work, struct sbp2_logical_unit, work.work); |
| 922 | struct sbp2_target *tgt = lu->tgt; |
| 923 | struct fw_device *device = target_parent_device(tgt); |
| 924 | int generation, node_id, local_node_id; |
| 925 | |
| 926 | if (fw_device_is_shutdown(device)) |
| 927 | return; |
| 928 | |
| 929 | generation = device->generation; |
| 930 | smp_rmb(); /* node IDs must not be older than generation */ |
| 931 | node_id = device->node_id; |
| 932 | local_node_id = device->card->node_id; |
| 933 | |
| 934 | if (sbp2_send_management_orb(lu, node_id, generation, |
| 935 | SBP2_RECONNECT_REQUEST, |
| 936 | lu->login_id, NULL) < 0) { |
| 937 | /* |
| 938 | * If reconnect was impossible even though we are in the |
| 939 | * current generation, fall back and try to log in again. |
| 940 | * |
| 941 | * We could check for "Function rejected" status, but |
| 942 | * looking at the bus generation as simpler and more general. |
| 943 | */ |
| 944 | smp_rmb(); /* get current card generation */ |
| 945 | if (generation == device->card->generation || |
| 946 | lu->retries++ >= 5) { |
| 947 | dev_err(tgt_dev(tgt), "failed to reconnect\n"); |
| 948 | lu->retries = 0; |
| 949 | lu->workfn = sbp2_login; |
| 950 | } |
| 951 | sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5)); |
| 952 | |
| 953 | return; |
| 954 | } |
| 955 | |
| 956 | tgt->node_id = node_id; |
| 957 | tgt->address_high = local_node_id << 16; |
| 958 | smp_wmb(); /* node IDs must not be older than generation */ |
| 959 | lu->generation = generation; |
| 960 | |
| 961 | dev_notice(tgt_dev(tgt), "reconnected to LUN %04x (%d retries)\n", |
| 962 | lu->lun, lu->retries); |
| 963 | |
| 964 | sbp2_agent_reset(lu); |
| 965 | sbp2_cancel_orbs(lu); |
| 966 | sbp2_conditionally_unblock(lu); |
| 967 | } |
| 968 | |
| 969 | static void sbp2_lu_workfn(struct work_struct *work) |
| 970 | { |
| 971 | struct sbp2_logical_unit *lu = container_of(to_delayed_work(work), |
| 972 | struct sbp2_logical_unit, work); |
| 973 | lu->workfn(work); |
| 974 | } |
| 975 | |
| 976 | static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry) |
| 977 | { |
| 978 | struct sbp2_logical_unit *lu; |
| 979 | |
| 980 | lu = kmalloc(sizeof(*lu), GFP_KERNEL); |
| 981 | if (!lu) |
| 982 | return -ENOMEM; |
| 983 | |
| 984 | lu->address_handler.length = 0x100; |
| 985 | lu->address_handler.address_callback = sbp2_status_write; |
| 986 | lu->address_handler.callback_data = lu; |
| 987 | |
| 988 | if (fw_core_add_address_handler(&lu->address_handler, |
| 989 | &fw_high_memory_region) < 0) { |
| 990 | kfree(lu); |
| 991 | return -ENOMEM; |
| 992 | } |
| 993 | |
| 994 | lu->tgt = tgt; |
| 995 | lu->lun = lun_entry & 0xffff; |
| 996 | lu->login_id = INVALID_LOGIN_ID; |
| 997 | lu->retries = 0; |
| 998 | lu->has_sdev = false; |
| 999 | lu->blocked = false; |
| 1000 | ++tgt->dont_block; |
| 1001 | INIT_LIST_HEAD(&lu->orb_list); |
| 1002 | lu->workfn = sbp2_login; |
| 1003 | INIT_DELAYED_WORK(&lu->work, sbp2_lu_workfn); |
| 1004 | |
| 1005 | list_add_tail(&lu->link, &tgt->lu_list); |
| 1006 | return 0; |
| 1007 | } |
| 1008 | |
| 1009 | static void sbp2_get_unit_unique_id(struct sbp2_target *tgt, |
| 1010 | const u32 *leaf) |
| 1011 | { |
| 1012 | if ((leaf[0] & 0xffff0000) == 0x00020000) |
| 1013 | tgt->guid = (u64)leaf[1] << 32 | leaf[2]; |
| 1014 | } |
| 1015 | |
| 1016 | static int sbp2_scan_logical_unit_dir(struct sbp2_target *tgt, |
| 1017 | const u32 *directory) |
| 1018 | { |
| 1019 | struct fw_csr_iterator ci; |
| 1020 | int key, value; |
| 1021 | |
| 1022 | fw_csr_iterator_init(&ci, directory); |
| 1023 | while (fw_csr_iterator_next(&ci, &key, &value)) |
| 1024 | if (key == SBP2_CSR_LOGICAL_UNIT_NUMBER && |
| 1025 | sbp2_add_logical_unit(tgt, value) < 0) |
| 1026 | return -ENOMEM; |
| 1027 | return 0; |
| 1028 | } |
| 1029 | |
| 1030 | static int sbp2_scan_unit_dir(struct sbp2_target *tgt, const u32 *directory, |
| 1031 | u32 *model, u32 *firmware_revision) |
| 1032 | { |
| 1033 | struct fw_csr_iterator ci; |
| 1034 | int key, value; |
| 1035 | |
| 1036 | fw_csr_iterator_init(&ci, directory); |
| 1037 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
| 1038 | switch (key) { |
| 1039 | |
| 1040 | case CSR_DEPENDENT_INFO | CSR_OFFSET: |
| 1041 | tgt->management_agent_address = |
| 1042 | CSR_REGISTER_BASE + 4 * value; |
| 1043 | break; |
| 1044 | |
| 1045 | case CSR_DIRECTORY_ID: |
| 1046 | tgt->directory_id = value; |
| 1047 | break; |
| 1048 | |
| 1049 | case CSR_MODEL: |
| 1050 | *model = value; |
| 1051 | break; |
| 1052 | |
| 1053 | case SBP2_CSR_FIRMWARE_REVISION: |
| 1054 | *firmware_revision = value; |
| 1055 | break; |
| 1056 | |
| 1057 | case SBP2_CSR_UNIT_CHARACTERISTICS: |
| 1058 | /* the timeout value is stored in 500ms units */ |
| 1059 | tgt->mgt_orb_timeout = (value >> 8 & 0xff) * 500; |
| 1060 | break; |
| 1061 | |
| 1062 | case SBP2_CSR_LOGICAL_UNIT_NUMBER: |
| 1063 | if (sbp2_add_logical_unit(tgt, value) < 0) |
| 1064 | return -ENOMEM; |
| 1065 | break; |
| 1066 | |
| 1067 | case SBP2_CSR_UNIT_UNIQUE_ID: |
| 1068 | sbp2_get_unit_unique_id(tgt, ci.p - 1 + value); |
| 1069 | break; |
| 1070 | |
| 1071 | case SBP2_CSR_LOGICAL_UNIT_DIRECTORY: |
| 1072 | /* Adjust for the increment in the iterator */ |
| 1073 | if (sbp2_scan_logical_unit_dir(tgt, ci.p - 1 + value) < 0) |
| 1074 | return -ENOMEM; |
| 1075 | break; |
| 1076 | } |
| 1077 | } |
| 1078 | return 0; |
| 1079 | } |
| 1080 | |
| 1081 | /* |
| 1082 | * Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be |
| 1083 | * provided in the config rom. Most devices do provide a value, which |
| 1084 | * we'll use for login management orbs, but with some sane limits. |
| 1085 | */ |
| 1086 | static void sbp2_clamp_management_orb_timeout(struct sbp2_target *tgt) |
| 1087 | { |
| 1088 | unsigned int timeout = tgt->mgt_orb_timeout; |
| 1089 | |
| 1090 | if (timeout > 40000) |
| 1091 | dev_notice(tgt_dev(tgt), "%ds mgt_ORB_timeout limited to 40s\n", |
| 1092 | timeout / 1000); |
| 1093 | |
| 1094 | tgt->mgt_orb_timeout = clamp_val(timeout, 5000, 40000); |
| 1095 | } |
| 1096 | |
| 1097 | static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model, |
| 1098 | u32 firmware_revision) |
| 1099 | { |
| 1100 | int i; |
| 1101 | unsigned int w = sbp2_param_workarounds; |
| 1102 | |
| 1103 | if (w) |
| 1104 | dev_notice(tgt_dev(tgt), |
| 1105 | "Please notify linux1394-devel@lists.sf.net " |
| 1106 | "if you need the workarounds parameter\n"); |
| 1107 | |
| 1108 | if (w & SBP2_WORKAROUND_OVERRIDE) |
| 1109 | goto out; |
| 1110 | |
| 1111 | for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) { |
| 1112 | |
| 1113 | if (sbp2_workarounds_table[i].firmware_revision != |
| 1114 | (firmware_revision & 0xffffff00)) |
| 1115 | continue; |
| 1116 | |
| 1117 | if (sbp2_workarounds_table[i].model != model && |
| 1118 | sbp2_workarounds_table[i].model != SBP2_ROM_VALUE_WILDCARD) |
| 1119 | continue; |
| 1120 | |
| 1121 | w |= sbp2_workarounds_table[i].workarounds; |
| 1122 | break; |
| 1123 | } |
| 1124 | out: |
| 1125 | if (w) |
| 1126 | dev_notice(tgt_dev(tgt), "workarounds 0x%x " |
| 1127 | "(firmware_revision 0x%06x, model_id 0x%06x)\n", |
| 1128 | w, firmware_revision, model); |
| 1129 | tgt->workarounds = w; |
| 1130 | } |
| 1131 | |
| 1132 | static struct scsi_host_template scsi_driver_template; |
| 1133 | static void sbp2_remove(struct fw_unit *unit); |
| 1134 | |
| 1135 | static int sbp2_probe(struct fw_unit *unit, const struct ieee1394_device_id *id) |
| 1136 | { |
| 1137 | struct fw_device *device = fw_parent_device(unit); |
| 1138 | struct sbp2_target *tgt; |
| 1139 | struct sbp2_logical_unit *lu; |
| 1140 | struct Scsi_Host *shost; |
| 1141 | u32 model, firmware_revision; |
| 1142 | |
| 1143 | /* cannot (or should not) handle targets on the local node */ |
| 1144 | if (device->is_local) |
| 1145 | return -ENODEV; |
| 1146 | |
| 1147 | if (dma_get_max_seg_size(device->card->device) > SBP2_MAX_SEG_SIZE) |
| 1148 | WARN_ON(dma_set_max_seg_size(device->card->device, |
| 1149 | SBP2_MAX_SEG_SIZE)); |
| 1150 | |
| 1151 | shost = scsi_host_alloc(&scsi_driver_template, sizeof(*tgt)); |
| 1152 | if (shost == NULL) |
| 1153 | return -ENOMEM; |
| 1154 | |
| 1155 | tgt = (struct sbp2_target *)shost->hostdata; |
| 1156 | dev_set_drvdata(&unit->device, tgt); |
| 1157 | tgt->unit = unit; |
| 1158 | INIT_LIST_HEAD(&tgt->lu_list); |
| 1159 | spin_lock_init(&tgt->lock); |
| 1160 | tgt->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4]; |
| 1161 | |
| 1162 | if (fw_device_enable_phys_dma(device) < 0) |
| 1163 | goto fail_shost_put; |
| 1164 | |
| 1165 | shost->max_cmd_len = SBP2_MAX_CDB_SIZE; |
| 1166 | |
| 1167 | if (scsi_add_host_with_dma(shost, &unit->device, |
| 1168 | device->card->device) < 0) |
| 1169 | goto fail_shost_put; |
| 1170 | |
| 1171 | /* implicit directory ID */ |
| 1172 | tgt->directory_id = ((unit->directory - device->config_rom) * 4 |
| 1173 | + CSR_CONFIG_ROM) & 0xffffff; |
| 1174 | |
| 1175 | firmware_revision = SBP2_ROM_VALUE_MISSING; |
| 1176 | model = SBP2_ROM_VALUE_MISSING; |
| 1177 | |
| 1178 | if (sbp2_scan_unit_dir(tgt, unit->directory, &model, |
| 1179 | &firmware_revision) < 0) |
| 1180 | goto fail_remove; |
| 1181 | |
| 1182 | sbp2_clamp_management_orb_timeout(tgt); |
| 1183 | sbp2_init_workarounds(tgt, model, firmware_revision); |
| 1184 | |
| 1185 | /* |
| 1186 | * At S100 we can do 512 bytes per packet, at S200 1024 bytes, |
| 1187 | * and so on up to 4096 bytes. The SBP-2 max_payload field |
| 1188 | * specifies the max payload size as 2 ^ (max_payload + 2), so |
| 1189 | * if we set this to max_speed + 7, we get the right value. |
| 1190 | */ |
| 1191 | tgt->max_payload = min3(device->max_speed + 7, 10U, |
| 1192 | device->card->max_receive - 1); |
| 1193 | |
| 1194 | /* Do the login in a workqueue so we can easily reschedule retries. */ |
| 1195 | list_for_each_entry(lu, &tgt->lu_list, link) |
| 1196 | sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5)); |
| 1197 | |
| 1198 | return 0; |
| 1199 | |
| 1200 | fail_remove: |
| 1201 | sbp2_remove(unit); |
| 1202 | return -ENOMEM; |
| 1203 | |
| 1204 | fail_shost_put: |
| 1205 | scsi_host_put(shost); |
| 1206 | return -ENOMEM; |
| 1207 | } |
| 1208 | |
| 1209 | static void sbp2_update(struct fw_unit *unit) |
| 1210 | { |
| 1211 | struct sbp2_target *tgt = dev_get_drvdata(&unit->device); |
| 1212 | struct sbp2_logical_unit *lu; |
| 1213 | |
| 1214 | fw_device_enable_phys_dma(fw_parent_device(unit)); |
| 1215 | |
| 1216 | /* |
| 1217 | * Fw-core serializes sbp2_update() against sbp2_remove(). |
| 1218 | * Iteration over tgt->lu_list is therefore safe here. |
| 1219 | */ |
| 1220 | list_for_each_entry(lu, &tgt->lu_list, link) { |
| 1221 | sbp2_conditionally_block(lu); |
| 1222 | lu->retries = 0; |
| 1223 | sbp2_queue_work(lu, 0); |
| 1224 | } |
| 1225 | } |
| 1226 | |
| 1227 | static void sbp2_remove(struct fw_unit *unit) |
| 1228 | { |
| 1229 | struct fw_device *device = fw_parent_device(unit); |
| 1230 | struct sbp2_target *tgt = dev_get_drvdata(&unit->device); |
| 1231 | struct sbp2_logical_unit *lu, *next; |
| 1232 | struct Scsi_Host *shost = |
| 1233 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
| 1234 | struct scsi_device *sdev; |
| 1235 | |
| 1236 | /* prevent deadlocks */ |
| 1237 | sbp2_unblock(tgt); |
| 1238 | |
| 1239 | list_for_each_entry_safe(lu, next, &tgt->lu_list, link) { |
| 1240 | cancel_delayed_work_sync(&lu->work); |
| 1241 | sdev = scsi_device_lookup(shost, 0, 0, sbp2_lun2int(lu->lun)); |
| 1242 | if (sdev) { |
| 1243 | scsi_remove_device(sdev); |
| 1244 | scsi_device_put(sdev); |
| 1245 | } |
| 1246 | if (lu->login_id != INVALID_LOGIN_ID) { |
| 1247 | int generation, node_id; |
| 1248 | /* |
| 1249 | * tgt->node_id may be obsolete here if we failed |
| 1250 | * during initial login or after a bus reset where |
| 1251 | * the topology changed. |
| 1252 | */ |
| 1253 | generation = device->generation; |
| 1254 | smp_rmb(); /* node_id vs. generation */ |
| 1255 | node_id = device->node_id; |
| 1256 | sbp2_send_management_orb(lu, node_id, generation, |
| 1257 | SBP2_LOGOUT_REQUEST, |
| 1258 | lu->login_id, NULL); |
| 1259 | } |
| 1260 | fw_core_remove_address_handler(&lu->address_handler); |
| 1261 | list_del(&lu->link); |
| 1262 | kfree(lu); |
| 1263 | } |
| 1264 | scsi_remove_host(shost); |
| 1265 | dev_notice(&unit->device, "released target %d:0:0\n", shost->host_no); |
| 1266 | |
| 1267 | scsi_host_put(shost); |
| 1268 | } |
| 1269 | |
| 1270 | #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e |
| 1271 | #define SBP2_SW_VERSION_ENTRY 0x00010483 |
| 1272 | |
| 1273 | static const struct ieee1394_device_id sbp2_id_table[] = { |
| 1274 | { |
| 1275 | .match_flags = IEEE1394_MATCH_SPECIFIER_ID | |
| 1276 | IEEE1394_MATCH_VERSION, |
| 1277 | .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY, |
| 1278 | .version = SBP2_SW_VERSION_ENTRY, |
| 1279 | }, |
| 1280 | { } |
| 1281 | }; |
| 1282 | |
| 1283 | static struct fw_driver sbp2_driver = { |
| 1284 | .driver = { |
| 1285 | .owner = THIS_MODULE, |
| 1286 | .name = KBUILD_MODNAME, |
| 1287 | .bus = &fw_bus_type, |
| 1288 | }, |
| 1289 | .probe = sbp2_probe, |
| 1290 | .update = sbp2_update, |
| 1291 | .remove = sbp2_remove, |
| 1292 | .id_table = sbp2_id_table, |
| 1293 | }; |
| 1294 | |
| 1295 | static void sbp2_unmap_scatterlist(struct device *card_device, |
| 1296 | struct sbp2_command_orb *orb) |
| 1297 | { |
| 1298 | scsi_dma_unmap(orb->cmd); |
| 1299 | |
| 1300 | if (orb->request.misc & cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT)) |
| 1301 | dma_unmap_single(card_device, orb->page_table_bus, |
| 1302 | sizeof(orb->page_table), DMA_TO_DEVICE); |
| 1303 | } |
| 1304 | |
| 1305 | static unsigned int sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data) |
| 1306 | { |
| 1307 | int sam_status; |
| 1308 | int sfmt = (sbp2_status[0] >> 6) & 0x03; |
| 1309 | |
| 1310 | if (sfmt == 2 || sfmt == 3) { |
| 1311 | /* |
| 1312 | * Reserved for future standardization (2) or |
| 1313 | * Status block format vendor-dependent (3) |
| 1314 | */ |
| 1315 | return DID_ERROR << 16; |
| 1316 | } |
| 1317 | |
| 1318 | sense_data[0] = 0x70 | sfmt | (sbp2_status[1] & 0x80); |
| 1319 | sense_data[1] = 0x0; |
| 1320 | sense_data[2] = ((sbp2_status[1] << 1) & 0xe0) | (sbp2_status[1] & 0x0f); |
| 1321 | sense_data[3] = sbp2_status[4]; |
| 1322 | sense_data[4] = sbp2_status[5]; |
| 1323 | sense_data[5] = sbp2_status[6]; |
| 1324 | sense_data[6] = sbp2_status[7]; |
| 1325 | sense_data[7] = 10; |
| 1326 | sense_data[8] = sbp2_status[8]; |
| 1327 | sense_data[9] = sbp2_status[9]; |
| 1328 | sense_data[10] = sbp2_status[10]; |
| 1329 | sense_data[11] = sbp2_status[11]; |
| 1330 | sense_data[12] = sbp2_status[2]; |
| 1331 | sense_data[13] = sbp2_status[3]; |
| 1332 | sense_data[14] = sbp2_status[12]; |
| 1333 | sense_data[15] = sbp2_status[13]; |
| 1334 | |
| 1335 | sam_status = sbp2_status[0] & 0x3f; |
| 1336 | |
| 1337 | switch (sam_status) { |
| 1338 | case SAM_STAT_GOOD: |
| 1339 | case SAM_STAT_CHECK_CONDITION: |
| 1340 | case SAM_STAT_CONDITION_MET: |
| 1341 | case SAM_STAT_BUSY: |
| 1342 | case SAM_STAT_RESERVATION_CONFLICT: |
| 1343 | case SAM_STAT_COMMAND_TERMINATED: |
| 1344 | return DID_OK << 16 | sam_status; |
| 1345 | |
| 1346 | default: |
| 1347 | return DID_ERROR << 16; |
| 1348 | } |
| 1349 | } |
| 1350 | |
| 1351 | static void complete_command_orb(struct sbp2_orb *base_orb, |
| 1352 | struct sbp2_status *status) |
| 1353 | { |
| 1354 | struct sbp2_command_orb *orb = |
| 1355 | container_of(base_orb, struct sbp2_command_orb, base); |
| 1356 | struct fw_device *device = target_parent_device(base_orb->lu->tgt); |
| 1357 | int result; |
| 1358 | |
| 1359 | if (status != NULL) { |
| 1360 | if (STATUS_GET_DEAD(*status)) |
| 1361 | sbp2_agent_reset_no_wait(base_orb->lu); |
| 1362 | |
| 1363 | switch (STATUS_GET_RESPONSE(*status)) { |
| 1364 | case SBP2_STATUS_REQUEST_COMPLETE: |
| 1365 | result = DID_OK << 16; |
| 1366 | break; |
| 1367 | case SBP2_STATUS_TRANSPORT_FAILURE: |
| 1368 | result = DID_BUS_BUSY << 16; |
| 1369 | break; |
| 1370 | case SBP2_STATUS_ILLEGAL_REQUEST: |
| 1371 | case SBP2_STATUS_VENDOR_DEPENDENT: |
| 1372 | default: |
| 1373 | result = DID_ERROR << 16; |
| 1374 | break; |
| 1375 | } |
| 1376 | |
| 1377 | if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1) |
| 1378 | result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status), |
| 1379 | orb->cmd->sense_buffer); |
| 1380 | } else { |
| 1381 | /* |
| 1382 | * If the orb completes with status == NULL, something |
| 1383 | * went wrong, typically a bus reset happened mid-orb |
| 1384 | * or when sending the write (less likely). |
| 1385 | */ |
| 1386 | result = DID_BUS_BUSY << 16; |
| 1387 | sbp2_conditionally_block(base_orb->lu); |
| 1388 | } |
| 1389 | |
| 1390 | dma_unmap_single(device->card->device, orb->base.request_bus, |
| 1391 | sizeof(orb->request), DMA_TO_DEVICE); |
| 1392 | sbp2_unmap_scatterlist(device->card->device, orb); |
| 1393 | |
| 1394 | orb->cmd->result = result; |
| 1395 | orb->cmd->scsi_done(orb->cmd); |
| 1396 | } |
| 1397 | |
| 1398 | static int sbp2_map_scatterlist(struct sbp2_command_orb *orb, |
| 1399 | struct fw_device *device, struct sbp2_logical_unit *lu) |
| 1400 | { |
| 1401 | struct scatterlist *sg = scsi_sglist(orb->cmd); |
| 1402 | int i, n; |
| 1403 | |
| 1404 | n = scsi_dma_map(orb->cmd); |
| 1405 | if (n <= 0) |
| 1406 | goto fail; |
| 1407 | |
| 1408 | /* |
| 1409 | * Handle the special case where there is only one element in |
| 1410 | * the scatter list by converting it to an immediate block |
| 1411 | * request. This is also a workaround for broken devices such |
| 1412 | * as the second generation iPod which doesn't support page |
| 1413 | * tables. |
| 1414 | */ |
| 1415 | if (n == 1) { |
| 1416 | orb->request.data_descriptor.high = |
| 1417 | cpu_to_be32(lu->tgt->address_high); |
| 1418 | orb->request.data_descriptor.low = |
| 1419 | cpu_to_be32(sg_dma_address(sg)); |
| 1420 | orb->request.misc |= |
| 1421 | cpu_to_be32(COMMAND_ORB_DATA_SIZE(sg_dma_len(sg))); |
| 1422 | return 0; |
| 1423 | } |
| 1424 | |
| 1425 | for_each_sg(sg, sg, n, i) { |
| 1426 | orb->page_table[i].high = cpu_to_be32(sg_dma_len(sg) << 16); |
| 1427 | orb->page_table[i].low = cpu_to_be32(sg_dma_address(sg)); |
| 1428 | } |
| 1429 | |
| 1430 | orb->page_table_bus = |
| 1431 | dma_map_single(device->card->device, orb->page_table, |
| 1432 | sizeof(orb->page_table), DMA_TO_DEVICE); |
| 1433 | if (dma_mapping_error(device->card->device, orb->page_table_bus)) |
| 1434 | goto fail_page_table; |
| 1435 | |
| 1436 | /* |
| 1437 | * The data_descriptor pointer is the one case where we need |
| 1438 | * to fill in the node ID part of the address. All other |
| 1439 | * pointers assume that the data referenced reside on the |
| 1440 | * initiator (i.e. us), but data_descriptor can refer to data |
| 1441 | * on other nodes so we need to put our ID in descriptor.high. |
| 1442 | */ |
| 1443 | orb->request.data_descriptor.high = cpu_to_be32(lu->tgt->address_high); |
| 1444 | orb->request.data_descriptor.low = cpu_to_be32(orb->page_table_bus); |
| 1445 | orb->request.misc |= cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT | |
| 1446 | COMMAND_ORB_DATA_SIZE(n)); |
| 1447 | |
| 1448 | return 0; |
| 1449 | |
| 1450 | fail_page_table: |
| 1451 | scsi_dma_unmap(orb->cmd); |
| 1452 | fail: |
| 1453 | return -ENOMEM; |
| 1454 | } |
| 1455 | |
| 1456 | /* SCSI stack integration */ |
| 1457 | |
| 1458 | static int sbp2_scsi_queuecommand(struct Scsi_Host *shost, |
| 1459 | struct scsi_cmnd *cmd) |
| 1460 | { |
| 1461 | struct sbp2_logical_unit *lu = cmd->device->hostdata; |
| 1462 | struct fw_device *device = target_parent_device(lu->tgt); |
| 1463 | struct sbp2_command_orb *orb; |
| 1464 | int generation, retval = SCSI_MLQUEUE_HOST_BUSY; |
| 1465 | |
| 1466 | orb = kzalloc(sizeof(*orb), GFP_ATOMIC); |
| 1467 | if (orb == NULL) |
| 1468 | return SCSI_MLQUEUE_HOST_BUSY; |
| 1469 | |
| 1470 | /* Initialize rcode to something not RCODE_COMPLETE. */ |
| 1471 | orb->base.rcode = -1; |
| 1472 | kref_init(&orb->base.kref); |
| 1473 | orb->cmd = cmd; |
| 1474 | orb->request.next.high = cpu_to_be32(SBP2_ORB_NULL); |
| 1475 | orb->request.misc = cpu_to_be32( |
| 1476 | COMMAND_ORB_MAX_PAYLOAD(lu->tgt->max_payload) | |
| 1477 | COMMAND_ORB_SPEED(device->max_speed) | |
| 1478 | COMMAND_ORB_NOTIFY); |
| 1479 | |
| 1480 | if (cmd->sc_data_direction == DMA_FROM_DEVICE) |
| 1481 | orb->request.misc |= cpu_to_be32(COMMAND_ORB_DIRECTION); |
| 1482 | |
| 1483 | generation = device->generation; |
| 1484 | smp_rmb(); /* sbp2_map_scatterlist looks at tgt->address_high */ |
| 1485 | |
| 1486 | if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0) |
| 1487 | goto out; |
| 1488 | |
| 1489 | memcpy(orb->request.command_block, cmd->cmnd, cmd->cmd_len); |
| 1490 | |
| 1491 | orb->base.callback = complete_command_orb; |
| 1492 | orb->base.request_bus = |
| 1493 | dma_map_single(device->card->device, &orb->request, |
| 1494 | sizeof(orb->request), DMA_TO_DEVICE); |
| 1495 | if (dma_mapping_error(device->card->device, orb->base.request_bus)) { |
| 1496 | sbp2_unmap_scatterlist(device->card->device, orb); |
| 1497 | goto out; |
| 1498 | } |
| 1499 | |
| 1500 | sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, generation, |
| 1501 | lu->command_block_agent_address + SBP2_ORB_POINTER); |
| 1502 | retval = 0; |
| 1503 | out: |
| 1504 | kref_put(&orb->base.kref, free_orb); |
| 1505 | return retval; |
| 1506 | } |
| 1507 | |
| 1508 | static int sbp2_scsi_slave_alloc(struct scsi_device *sdev) |
| 1509 | { |
| 1510 | struct sbp2_logical_unit *lu = sdev->hostdata; |
| 1511 | |
| 1512 | /* (Re-)Adding logical units via the SCSI stack is not supported. */ |
| 1513 | if (!lu) |
| 1514 | return -ENOSYS; |
| 1515 | |
| 1516 | sdev->allow_restart = 1; |
| 1517 | |
| 1518 | /* |
| 1519 | * SBP-2 does not require any alignment, but we set it anyway |
| 1520 | * for compatibility with earlier versions of this driver. |
| 1521 | */ |
| 1522 | blk_queue_update_dma_alignment(sdev->request_queue, 4 - 1); |
| 1523 | |
| 1524 | if (lu->tgt->workarounds & SBP2_WORKAROUND_INQUIRY_36) |
| 1525 | sdev->inquiry_len = 36; |
| 1526 | |
| 1527 | return 0; |
| 1528 | } |
| 1529 | |
| 1530 | static int sbp2_scsi_slave_configure(struct scsi_device *sdev) |
| 1531 | { |
| 1532 | struct sbp2_logical_unit *lu = sdev->hostdata; |
| 1533 | |
| 1534 | sdev->use_10_for_rw = 1; |
| 1535 | |
| 1536 | if (sbp2_param_exclusive_login) |
| 1537 | sdev->manage_start_stop = 1; |
| 1538 | |
| 1539 | if (sdev->type == TYPE_ROM) |
| 1540 | sdev->use_10_for_ms = 1; |
| 1541 | |
| 1542 | if (sdev->type == TYPE_DISK && |
| 1543 | lu->tgt->workarounds & SBP2_WORKAROUND_MODE_SENSE_8) |
| 1544 | sdev->skip_ms_page_8 = 1; |
| 1545 | |
| 1546 | if (lu->tgt->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) |
| 1547 | sdev->fix_capacity = 1; |
| 1548 | |
| 1549 | if (lu->tgt->workarounds & SBP2_WORKAROUND_POWER_CONDITION) |
| 1550 | sdev->start_stop_pwr_cond = 1; |
| 1551 | |
| 1552 | if (lu->tgt->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS) |
| 1553 | blk_queue_max_hw_sectors(sdev->request_queue, 128 * 1024 / 512); |
| 1554 | |
| 1555 | return 0; |
| 1556 | } |
| 1557 | |
| 1558 | /* |
| 1559 | * Called by scsi stack when something has really gone wrong. Usually |
| 1560 | * called when a command has timed-out for some reason. |
| 1561 | */ |
| 1562 | static int sbp2_scsi_abort(struct scsi_cmnd *cmd) |
| 1563 | { |
| 1564 | struct sbp2_logical_unit *lu = cmd->device->hostdata; |
| 1565 | |
| 1566 | dev_notice(lu_dev(lu), "sbp2_scsi_abort\n"); |
| 1567 | sbp2_agent_reset(lu); |
| 1568 | sbp2_cancel_orbs(lu); |
| 1569 | |
| 1570 | return SUCCESS; |
| 1571 | } |
| 1572 | |
| 1573 | /* |
| 1574 | * Format of /sys/bus/scsi/devices/.../ieee1394_id: |
| 1575 | * u64 EUI-64 : u24 directory_ID : u16 LUN (all printed in hexadecimal) |
| 1576 | * |
| 1577 | * This is the concatenation of target port identifier and logical unit |
| 1578 | * identifier as per SAM-2...SAM-4 annex A. |
| 1579 | */ |
| 1580 | static ssize_t sbp2_sysfs_ieee1394_id_show(struct device *dev, |
| 1581 | struct device_attribute *attr, char *buf) |
| 1582 | { |
| 1583 | struct scsi_device *sdev = to_scsi_device(dev); |
| 1584 | struct sbp2_logical_unit *lu; |
| 1585 | |
| 1586 | if (!sdev) |
| 1587 | return 0; |
| 1588 | |
| 1589 | lu = sdev->hostdata; |
| 1590 | |
| 1591 | return sprintf(buf, "%016llx:%06x:%04x\n", |
| 1592 | (unsigned long long)lu->tgt->guid, |
| 1593 | lu->tgt->directory_id, lu->lun); |
| 1594 | } |
| 1595 | |
| 1596 | static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL); |
| 1597 | |
| 1598 | static struct device_attribute *sbp2_scsi_sysfs_attrs[] = { |
| 1599 | &dev_attr_ieee1394_id, |
| 1600 | NULL |
| 1601 | }; |
| 1602 | |
| 1603 | static struct scsi_host_template scsi_driver_template = { |
| 1604 | .module = THIS_MODULE, |
| 1605 | .name = "SBP-2 IEEE-1394", |
| 1606 | .proc_name = "sbp2", |
| 1607 | .queuecommand = sbp2_scsi_queuecommand, |
| 1608 | .slave_alloc = sbp2_scsi_slave_alloc, |
| 1609 | .slave_configure = sbp2_scsi_slave_configure, |
| 1610 | .eh_abort_handler = sbp2_scsi_abort, |
| 1611 | .this_id = -1, |
| 1612 | .sg_tablesize = SG_ALL, |
| 1613 | .use_clustering = ENABLE_CLUSTERING, |
| 1614 | .can_queue = 1, |
| 1615 | .sdev_attrs = sbp2_scsi_sysfs_attrs, |
| 1616 | }; |
| 1617 | |
| 1618 | MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>"); |
| 1619 | MODULE_DESCRIPTION("SCSI over IEEE1394"); |
| 1620 | MODULE_LICENSE("GPL"); |
| 1621 | MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table); |
| 1622 | |
| 1623 | /* Provide a module alias so root-on-sbp2 initrds don't break. */ |
| 1624 | MODULE_ALIAS("sbp2"); |
| 1625 | |
| 1626 | static int __init sbp2_init(void) |
| 1627 | { |
| 1628 | return driver_register(&sbp2_driver.driver); |
| 1629 | } |
| 1630 | |
| 1631 | static void __exit sbp2_cleanup(void) |
| 1632 | { |
| 1633 | driver_unregister(&sbp2_driver.driver); |
| 1634 | } |
| 1635 | |
| 1636 | module_init(sbp2_init); |
| 1637 | module_exit(sbp2_cleanup); |