| 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 | #include <asm/system.h> |
| 56 | |
| 57 | #include <scsi/scsi.h> |
| 58 | #include <scsi/scsi_cmnd.h> |
| 59 | #include <scsi/scsi_device.h> |
| 60 | #include <scsi/scsi_host.h> |
| 61 | |
| 62 | /* |
| 63 | * So far only bridges from Oxford Semiconductor are known to support |
| 64 | * concurrent logins. Depending on firmware, four or two concurrent logins |
| 65 | * are possible on OXFW911 and newer Oxsemi bridges. |
| 66 | * |
| 67 | * Concurrent logins are useful together with cluster filesystems. |
| 68 | */ |
| 69 | static int sbp2_param_exclusive_login = 1; |
| 70 | module_param_named(exclusive_login, sbp2_param_exclusive_login, bool, 0644); |
| 71 | MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device " |
| 72 | "(default = Y, use N for concurrent initiators)"); |
| 73 | |
| 74 | /* |
| 75 | * Flags for firmware oddities |
| 76 | * |
| 77 | * - 128kB max transfer |
| 78 | * Limit transfer size. Necessary for some old bridges. |
| 79 | * |
| 80 | * - 36 byte inquiry |
| 81 | * When scsi_mod probes the device, let the inquiry command look like that |
| 82 | * from MS Windows. |
| 83 | * |
| 84 | * - skip mode page 8 |
| 85 | * Suppress sending of mode_sense for mode page 8 if the device pretends to |
| 86 | * support the SCSI Primary Block commands instead of Reduced Block Commands. |
| 87 | * |
| 88 | * - fix capacity |
| 89 | * Tell sd_mod to correct the last sector number reported by read_capacity. |
| 90 | * Avoids access beyond actual disk limits on devices with an off-by-one bug. |
| 91 | * Don't use this with devices which don't have this bug. |
| 92 | * |
| 93 | * - delay inquiry |
| 94 | * Wait extra SBP2_INQUIRY_DELAY seconds after login before SCSI inquiry. |
| 95 | * |
| 96 | * - power condition |
| 97 | * Set the power condition field in the START STOP UNIT commands sent by |
| 98 | * sd_mod on suspend, resume, and shutdown (if manage_start_stop is on). |
| 99 | * Some disks need this to spin down or to resume properly. |
| 100 | * |
| 101 | * - override internal blacklist |
| 102 | * Instead of adding to the built-in blacklist, use only the workarounds |
| 103 | * specified in the module load parameter. |
| 104 | * Useful if a blacklist entry interfered with a non-broken device. |
| 105 | */ |
| 106 | #define SBP2_WORKAROUND_128K_MAX_TRANS 0x1 |
| 107 | #define SBP2_WORKAROUND_INQUIRY_36 0x2 |
| 108 | #define SBP2_WORKAROUND_MODE_SENSE_8 0x4 |
| 109 | #define SBP2_WORKAROUND_FIX_CAPACITY 0x8 |
| 110 | #define SBP2_WORKAROUND_DELAY_INQUIRY 0x10 |
| 111 | #define SBP2_INQUIRY_DELAY 12 |
| 112 | #define SBP2_WORKAROUND_POWER_CONDITION 0x20 |
| 113 | #define SBP2_WORKAROUND_OVERRIDE 0x100 |
| 114 | |
| 115 | static int sbp2_param_workarounds; |
| 116 | module_param_named(workarounds, sbp2_param_workarounds, int, 0644); |
| 117 | MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0" |
| 118 | ", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS) |
| 119 | ", 36 byte inquiry = " __stringify(SBP2_WORKAROUND_INQUIRY_36) |
| 120 | ", skip mode page 8 = " __stringify(SBP2_WORKAROUND_MODE_SENSE_8) |
| 121 | ", fix capacity = " __stringify(SBP2_WORKAROUND_FIX_CAPACITY) |
| 122 | ", delay inquiry = " __stringify(SBP2_WORKAROUND_DELAY_INQUIRY) |
| 123 | ", set power condition in start stop unit = " |
| 124 | __stringify(SBP2_WORKAROUND_POWER_CONDITION) |
| 125 | ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE) |
| 126 | ", or a combination)"); |
| 127 | |
| 128 | /* I don't know why the SCSI stack doesn't define something like this... */ |
| 129 | typedef void (*scsi_done_fn_t)(struct scsi_cmnd *); |
| 130 | |
| 131 | static const char sbp2_driver_name[] = "sbp2"; |
| 132 | |
| 133 | /* |
| 134 | * We create one struct sbp2_logical_unit per SBP-2 Logical Unit Number Entry |
| 135 | * and one struct scsi_device per sbp2_logical_unit. |
| 136 | */ |
| 137 | struct sbp2_logical_unit { |
| 138 | struct sbp2_target *tgt; |
| 139 | struct list_head link; |
| 140 | struct fw_address_handler address_handler; |
| 141 | struct list_head orb_list; |
| 142 | |
| 143 | u64 command_block_agent_address; |
| 144 | u16 lun; |
| 145 | int login_id; |
| 146 | |
| 147 | /* |
| 148 | * The generation is updated once we've logged in or reconnected |
| 149 | * to the logical unit. Thus, I/O to the device will automatically |
| 150 | * fail and get retried if it happens in a window where the device |
| 151 | * is not ready, e.g. after a bus reset but before we reconnect. |
| 152 | */ |
| 153 | int generation; |
| 154 | int retries; |
| 155 | struct delayed_work work; |
| 156 | bool has_sdev; |
| 157 | bool blocked; |
| 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 kref kref; |
| 166 | struct fw_unit *unit; |
| 167 | const char *bus_id; |
| 168 | struct list_head lu_list; |
| 169 | |
| 170 | u64 management_agent_address; |
| 171 | u64 guid; |
| 172 | int directory_id; |
| 173 | int node_id; |
| 174 | int address_high; |
| 175 | unsigned int workarounds; |
| 176 | unsigned int mgt_orb_timeout; |
| 177 | unsigned int max_payload; |
| 178 | |
| 179 | int dont_block; /* counter for each logical unit */ |
| 180 | int blocked; /* ditto */ |
| 181 | }; |
| 182 | |
| 183 | static struct fw_device *target_device(struct sbp2_target *tgt) |
| 184 | { |
| 185 | return fw_parent_device(tgt->unit); |
| 186 | } |
| 187 | |
| 188 | /* Impossible login_id, to detect logout attempt before successful login */ |
| 189 | #define INVALID_LOGIN_ID 0x10000 |
| 190 | |
| 191 | #define SBP2_ORB_TIMEOUT 2000U /* Timeout in ms */ |
| 192 | #define SBP2_ORB_NULL 0x80000000 |
| 193 | #define SBP2_RETRY_LIMIT 0xf /* 15 retries */ |
| 194 | #define SBP2_CYCLE_LIMIT (0xc8 << 12) /* 200 125us cycles */ |
| 195 | |
| 196 | /* |
| 197 | * There is no transport protocol limit to the CDB length, but we implement |
| 198 | * a fixed length only. 16 bytes is enough for disks larger than 2 TB. |
| 199 | */ |
| 200 | #define SBP2_MAX_CDB_SIZE 16 |
| 201 | |
| 202 | /* |
| 203 | * The default maximum s/g segment size of a FireWire controller is |
| 204 | * usually 0x10000, but SBP-2 only allows 0xffff. Since buffers have to |
| 205 | * be quadlet-aligned, we set the length limit to 0xffff & ~3. |
| 206 | */ |
| 207 | #define SBP2_MAX_SEG_SIZE 0xfffc |
| 208 | |
| 209 | /* Unit directory keys */ |
| 210 | #define SBP2_CSR_UNIT_CHARACTERISTICS 0x3a |
| 211 | #define SBP2_CSR_FIRMWARE_REVISION 0x3c |
| 212 | #define SBP2_CSR_LOGICAL_UNIT_NUMBER 0x14 |
| 213 | #define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4 |
| 214 | |
| 215 | /* Management orb opcodes */ |
| 216 | #define SBP2_LOGIN_REQUEST 0x0 |
| 217 | #define SBP2_QUERY_LOGINS_REQUEST 0x1 |
| 218 | #define SBP2_RECONNECT_REQUEST 0x3 |
| 219 | #define SBP2_SET_PASSWORD_REQUEST 0x4 |
| 220 | #define SBP2_LOGOUT_REQUEST 0x7 |
| 221 | #define SBP2_ABORT_TASK_REQUEST 0xb |
| 222 | #define SBP2_ABORT_TASK_SET 0xc |
| 223 | #define SBP2_LOGICAL_UNIT_RESET 0xe |
| 224 | #define SBP2_TARGET_RESET_REQUEST 0xf |
| 225 | |
| 226 | /* Offsets for command block agent registers */ |
| 227 | #define SBP2_AGENT_STATE 0x00 |
| 228 | #define SBP2_AGENT_RESET 0x04 |
| 229 | #define SBP2_ORB_POINTER 0x08 |
| 230 | #define SBP2_DOORBELL 0x10 |
| 231 | #define SBP2_UNSOLICITED_STATUS_ENABLE 0x14 |
| 232 | |
| 233 | /* Status write response codes */ |
| 234 | #define SBP2_STATUS_REQUEST_COMPLETE 0x0 |
| 235 | #define SBP2_STATUS_TRANSPORT_FAILURE 0x1 |
| 236 | #define SBP2_STATUS_ILLEGAL_REQUEST 0x2 |
| 237 | #define SBP2_STATUS_VENDOR_DEPENDENT 0x3 |
| 238 | |
| 239 | #define STATUS_GET_ORB_HIGH(v) ((v).status & 0xffff) |
| 240 | #define STATUS_GET_SBP_STATUS(v) (((v).status >> 16) & 0xff) |
| 241 | #define STATUS_GET_LEN(v) (((v).status >> 24) & 0x07) |
| 242 | #define STATUS_GET_DEAD(v) (((v).status >> 27) & 0x01) |
| 243 | #define STATUS_GET_RESPONSE(v) (((v).status >> 28) & 0x03) |
| 244 | #define STATUS_GET_SOURCE(v) (((v).status >> 30) & 0x03) |
| 245 | #define STATUS_GET_ORB_LOW(v) ((v).orb_low) |
| 246 | #define STATUS_GET_DATA(v) ((v).data) |
| 247 | |
| 248 | struct sbp2_status { |
| 249 | u32 status; |
| 250 | u32 orb_low; |
| 251 | u8 data[24]; |
| 252 | }; |
| 253 | |
| 254 | struct sbp2_pointer { |
| 255 | __be32 high; |
| 256 | __be32 low; |
| 257 | }; |
| 258 | |
| 259 | struct sbp2_orb { |
| 260 | struct fw_transaction t; |
| 261 | struct kref kref; |
| 262 | dma_addr_t request_bus; |
| 263 | int rcode; |
| 264 | struct sbp2_pointer pointer; |
| 265 | void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status); |
| 266 | struct list_head link; |
| 267 | }; |
| 268 | |
| 269 | #define MANAGEMENT_ORB_LUN(v) ((v)) |
| 270 | #define MANAGEMENT_ORB_FUNCTION(v) ((v) << 16) |
| 271 | #define MANAGEMENT_ORB_RECONNECT(v) ((v) << 20) |
| 272 | #define MANAGEMENT_ORB_EXCLUSIVE(v) ((v) ? 1 << 28 : 0) |
| 273 | #define MANAGEMENT_ORB_REQUEST_FORMAT(v) ((v) << 29) |
| 274 | #define MANAGEMENT_ORB_NOTIFY ((1) << 31) |
| 275 | |
| 276 | #define MANAGEMENT_ORB_RESPONSE_LENGTH(v) ((v)) |
| 277 | #define MANAGEMENT_ORB_PASSWORD_LENGTH(v) ((v) << 16) |
| 278 | |
| 279 | struct sbp2_management_orb { |
| 280 | struct sbp2_orb base; |
| 281 | struct { |
| 282 | struct sbp2_pointer password; |
| 283 | struct sbp2_pointer response; |
| 284 | __be32 misc; |
| 285 | __be32 length; |
| 286 | struct sbp2_pointer status_fifo; |
| 287 | } request; |
| 288 | __be32 response[4]; |
| 289 | dma_addr_t response_bus; |
| 290 | struct completion done; |
| 291 | struct sbp2_status status; |
| 292 | }; |
| 293 | |
| 294 | struct sbp2_login_response { |
| 295 | __be32 misc; |
| 296 | struct sbp2_pointer command_block_agent; |
| 297 | __be32 reconnect_hold; |
| 298 | }; |
| 299 | #define COMMAND_ORB_DATA_SIZE(v) ((v)) |
| 300 | #define COMMAND_ORB_PAGE_SIZE(v) ((v) << 16) |
| 301 | #define COMMAND_ORB_PAGE_TABLE_PRESENT ((1) << 19) |
| 302 | #define COMMAND_ORB_MAX_PAYLOAD(v) ((v) << 20) |
| 303 | #define COMMAND_ORB_SPEED(v) ((v) << 24) |
| 304 | #define COMMAND_ORB_DIRECTION ((1) << 27) |
| 305 | #define COMMAND_ORB_REQUEST_FORMAT(v) ((v) << 29) |
| 306 | #define COMMAND_ORB_NOTIFY ((1) << 31) |
| 307 | |
| 308 | struct sbp2_command_orb { |
| 309 | struct sbp2_orb base; |
| 310 | struct { |
| 311 | struct sbp2_pointer next; |
| 312 | struct sbp2_pointer data_descriptor; |
| 313 | __be32 misc; |
| 314 | u8 command_block[SBP2_MAX_CDB_SIZE]; |
| 315 | } request; |
| 316 | struct scsi_cmnd *cmd; |
| 317 | scsi_done_fn_t done; |
| 318 | struct sbp2_logical_unit *lu; |
| 319 | |
| 320 | struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8))); |
| 321 | dma_addr_t page_table_bus; |
| 322 | }; |
| 323 | |
| 324 | #define SBP2_ROM_VALUE_WILDCARD ~0 /* match all */ |
| 325 | #define SBP2_ROM_VALUE_MISSING 0xff000000 /* not present in the unit dir. */ |
| 326 | |
| 327 | /* |
| 328 | * List of devices with known bugs. |
| 329 | * |
| 330 | * The firmware_revision field, masked with 0xffff00, is the best |
| 331 | * indicator for the type of bridge chip of a device. It yields a few |
| 332 | * false positives but this did not break correctly behaving devices |
| 333 | * so far. |
| 334 | */ |
| 335 | static const struct { |
| 336 | u32 firmware_revision; |
| 337 | u32 model; |
| 338 | unsigned int workarounds; |
| 339 | } sbp2_workarounds_table[] = { |
| 340 | /* DViCO Momobay CX-1 with TSB42AA9 bridge */ { |
| 341 | .firmware_revision = 0x002800, |
| 342 | .model = 0x001010, |
| 343 | .workarounds = SBP2_WORKAROUND_INQUIRY_36 | |
| 344 | SBP2_WORKAROUND_MODE_SENSE_8 | |
| 345 | SBP2_WORKAROUND_POWER_CONDITION, |
| 346 | }, |
| 347 | /* DViCO Momobay FX-3A with TSB42AA9A bridge */ { |
| 348 | .firmware_revision = 0x002800, |
| 349 | .model = 0x000000, |
| 350 | .workarounds = SBP2_WORKAROUND_POWER_CONDITION, |
| 351 | }, |
| 352 | /* Initio bridges, actually only needed for some older ones */ { |
| 353 | .firmware_revision = 0x000200, |
| 354 | .model = SBP2_ROM_VALUE_WILDCARD, |
| 355 | .workarounds = SBP2_WORKAROUND_INQUIRY_36, |
| 356 | }, |
| 357 | /* PL-3507 bridge with Prolific firmware */ { |
| 358 | .firmware_revision = 0x012800, |
| 359 | .model = SBP2_ROM_VALUE_WILDCARD, |
| 360 | .workarounds = SBP2_WORKAROUND_POWER_CONDITION, |
| 361 | }, |
| 362 | /* Symbios bridge */ { |
| 363 | .firmware_revision = 0xa0b800, |
| 364 | .model = SBP2_ROM_VALUE_WILDCARD, |
| 365 | .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, |
| 366 | }, |
| 367 | /* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ { |
| 368 | .firmware_revision = 0x002600, |
| 369 | .model = SBP2_ROM_VALUE_WILDCARD, |
| 370 | .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS, |
| 371 | }, |
| 372 | /* |
| 373 | * iPod 2nd generation: needs 128k max transfer size workaround |
| 374 | * iPod 3rd generation: needs fix capacity workaround |
| 375 | */ |
| 376 | { |
| 377 | .firmware_revision = 0x0a2700, |
| 378 | .model = 0x000000, |
| 379 | .workarounds = SBP2_WORKAROUND_128K_MAX_TRANS | |
| 380 | SBP2_WORKAROUND_FIX_CAPACITY, |
| 381 | }, |
| 382 | /* iPod 4th generation */ { |
| 383 | .firmware_revision = 0x0a2700, |
| 384 | .model = 0x000021, |
| 385 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, |
| 386 | }, |
| 387 | /* iPod mini */ { |
| 388 | .firmware_revision = 0x0a2700, |
| 389 | .model = 0x000022, |
| 390 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, |
| 391 | }, |
| 392 | /* iPod mini */ { |
| 393 | .firmware_revision = 0x0a2700, |
| 394 | .model = 0x000023, |
| 395 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, |
| 396 | }, |
| 397 | /* iPod Photo */ { |
| 398 | .firmware_revision = 0x0a2700, |
| 399 | .model = 0x00007e, |
| 400 | .workarounds = SBP2_WORKAROUND_FIX_CAPACITY, |
| 401 | } |
| 402 | }; |
| 403 | |
| 404 | static void free_orb(struct kref *kref) |
| 405 | { |
| 406 | struct sbp2_orb *orb = container_of(kref, struct sbp2_orb, kref); |
| 407 | |
| 408 | kfree(orb); |
| 409 | } |
| 410 | |
| 411 | static void sbp2_status_write(struct fw_card *card, struct fw_request *request, |
| 412 | int tcode, int destination, int source, |
| 413 | int generation, int speed, |
| 414 | unsigned long long offset, |
| 415 | void *payload, size_t length, void *callback_data) |
| 416 | { |
| 417 | struct sbp2_logical_unit *lu = callback_data; |
| 418 | struct sbp2_orb *orb; |
| 419 | struct sbp2_status status; |
| 420 | unsigned long flags; |
| 421 | |
| 422 | if (tcode != TCODE_WRITE_BLOCK_REQUEST || |
| 423 | length < 8 || length > sizeof(status)) { |
| 424 | fw_send_response(card, request, RCODE_TYPE_ERROR); |
| 425 | return; |
| 426 | } |
| 427 | |
| 428 | status.status = be32_to_cpup(payload); |
| 429 | status.orb_low = be32_to_cpup(payload + 4); |
| 430 | memset(status.data, 0, sizeof(status.data)); |
| 431 | if (length > 8) |
| 432 | memcpy(status.data, payload + 8, length - 8); |
| 433 | |
| 434 | if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) { |
| 435 | fw_notify("non-orb related status write, not handled\n"); |
| 436 | fw_send_response(card, request, RCODE_COMPLETE); |
| 437 | return; |
| 438 | } |
| 439 | |
| 440 | /* Lookup the orb corresponding to this status write. */ |
| 441 | spin_lock_irqsave(&card->lock, flags); |
| 442 | list_for_each_entry(orb, &lu->orb_list, link) { |
| 443 | if (STATUS_GET_ORB_HIGH(status) == 0 && |
| 444 | STATUS_GET_ORB_LOW(status) == orb->request_bus) { |
| 445 | orb->rcode = RCODE_COMPLETE; |
| 446 | list_del(&orb->link); |
| 447 | break; |
| 448 | } |
| 449 | } |
| 450 | spin_unlock_irqrestore(&card->lock, flags); |
| 451 | |
| 452 | if (&orb->link != &lu->orb_list) { |
| 453 | orb->callback(orb, &status); |
| 454 | kref_put(&orb->kref, free_orb); |
| 455 | } else { |
| 456 | fw_error("status write for unknown orb\n"); |
| 457 | } |
| 458 | |
| 459 | fw_send_response(card, request, RCODE_COMPLETE); |
| 460 | } |
| 461 | |
| 462 | static void complete_transaction(struct fw_card *card, int rcode, |
| 463 | void *payload, size_t length, void *data) |
| 464 | { |
| 465 | struct sbp2_orb *orb = data; |
| 466 | unsigned long flags; |
| 467 | |
| 468 | /* |
| 469 | * This is a little tricky. We can get the status write for |
| 470 | * the orb before we get this callback. The status write |
| 471 | * handler above will assume the orb pointer transaction was |
| 472 | * successful and set the rcode to RCODE_COMPLETE for the orb. |
| 473 | * So this callback only sets the rcode if it hasn't already |
| 474 | * been set and only does the cleanup if the transaction |
| 475 | * failed and we didn't already get a status write. |
| 476 | */ |
| 477 | spin_lock_irqsave(&card->lock, flags); |
| 478 | |
| 479 | if (orb->rcode == -1) |
| 480 | orb->rcode = rcode; |
| 481 | if (orb->rcode != RCODE_COMPLETE) { |
| 482 | list_del(&orb->link); |
| 483 | spin_unlock_irqrestore(&card->lock, flags); |
| 484 | orb->callback(orb, NULL); |
| 485 | } else { |
| 486 | spin_unlock_irqrestore(&card->lock, flags); |
| 487 | } |
| 488 | |
| 489 | kref_put(&orb->kref, free_orb); |
| 490 | } |
| 491 | |
| 492 | static void sbp2_send_orb(struct sbp2_orb *orb, struct sbp2_logical_unit *lu, |
| 493 | int node_id, int generation, u64 offset) |
| 494 | { |
| 495 | struct fw_device *device = target_device(lu->tgt); |
| 496 | unsigned long flags; |
| 497 | |
| 498 | orb->pointer.high = 0; |
| 499 | orb->pointer.low = cpu_to_be32(orb->request_bus); |
| 500 | |
| 501 | spin_lock_irqsave(&device->card->lock, flags); |
| 502 | list_add_tail(&orb->link, &lu->orb_list); |
| 503 | spin_unlock_irqrestore(&device->card->lock, flags); |
| 504 | |
| 505 | /* Take a ref for the orb list and for the transaction callback. */ |
| 506 | kref_get(&orb->kref); |
| 507 | kref_get(&orb->kref); |
| 508 | |
| 509 | fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST, |
| 510 | node_id, generation, device->max_speed, offset, |
| 511 | &orb->pointer, sizeof(orb->pointer), |
| 512 | complete_transaction, orb); |
| 513 | } |
| 514 | |
| 515 | static int sbp2_cancel_orbs(struct sbp2_logical_unit *lu) |
| 516 | { |
| 517 | struct fw_device *device = target_device(lu->tgt); |
| 518 | struct sbp2_orb *orb, *next; |
| 519 | struct list_head list; |
| 520 | unsigned long flags; |
| 521 | int retval = -ENOENT; |
| 522 | |
| 523 | INIT_LIST_HEAD(&list); |
| 524 | spin_lock_irqsave(&device->card->lock, flags); |
| 525 | list_splice_init(&lu->orb_list, &list); |
| 526 | spin_unlock_irqrestore(&device->card->lock, flags); |
| 527 | |
| 528 | list_for_each_entry_safe(orb, next, &list, link) { |
| 529 | retval = 0; |
| 530 | if (fw_cancel_transaction(device->card, &orb->t) == 0) |
| 531 | continue; |
| 532 | |
| 533 | orb->rcode = RCODE_CANCELLED; |
| 534 | orb->callback(orb, NULL); |
| 535 | } |
| 536 | |
| 537 | return retval; |
| 538 | } |
| 539 | |
| 540 | static void complete_management_orb(struct sbp2_orb *base_orb, |
| 541 | struct sbp2_status *status) |
| 542 | { |
| 543 | struct sbp2_management_orb *orb = |
| 544 | container_of(base_orb, struct sbp2_management_orb, base); |
| 545 | |
| 546 | if (status) |
| 547 | memcpy(&orb->status, status, sizeof(*status)); |
| 548 | complete(&orb->done); |
| 549 | } |
| 550 | |
| 551 | static int sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id, |
| 552 | int generation, int function, |
| 553 | int lun_or_login_id, void *response) |
| 554 | { |
| 555 | struct fw_device *device = target_device(lu->tgt); |
| 556 | struct sbp2_management_orb *orb; |
| 557 | unsigned int timeout; |
| 558 | int retval = -ENOMEM; |
| 559 | |
| 560 | if (function == SBP2_LOGOUT_REQUEST && fw_device_is_shutdown(device)) |
| 561 | return 0; |
| 562 | |
| 563 | orb = kzalloc(sizeof(*orb), GFP_ATOMIC); |
| 564 | if (orb == NULL) |
| 565 | return -ENOMEM; |
| 566 | |
| 567 | kref_init(&orb->base.kref); |
| 568 | orb->response_bus = |
| 569 | dma_map_single(device->card->device, &orb->response, |
| 570 | sizeof(orb->response), DMA_FROM_DEVICE); |
| 571 | if (dma_mapping_error(device->card->device, orb->response_bus)) |
| 572 | goto fail_mapping_response; |
| 573 | |
| 574 | orb->request.response.high = 0; |
| 575 | orb->request.response.low = cpu_to_be32(orb->response_bus); |
| 576 | |
| 577 | orb->request.misc = cpu_to_be32( |
| 578 | MANAGEMENT_ORB_NOTIFY | |
| 579 | MANAGEMENT_ORB_FUNCTION(function) | |
| 580 | MANAGEMENT_ORB_LUN(lun_or_login_id)); |
| 581 | orb->request.length = cpu_to_be32( |
| 582 | MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response))); |
| 583 | |
| 584 | orb->request.status_fifo.high = |
| 585 | cpu_to_be32(lu->address_handler.offset >> 32); |
| 586 | orb->request.status_fifo.low = |
| 587 | cpu_to_be32(lu->address_handler.offset); |
| 588 | |
| 589 | if (function == SBP2_LOGIN_REQUEST) { |
| 590 | /* Ask for 2^2 == 4 seconds reconnect grace period */ |
| 591 | orb->request.misc |= cpu_to_be32( |
| 592 | MANAGEMENT_ORB_RECONNECT(2) | |
| 593 | MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login)); |
| 594 | timeout = lu->tgt->mgt_orb_timeout; |
| 595 | } else { |
| 596 | timeout = SBP2_ORB_TIMEOUT; |
| 597 | } |
| 598 | |
| 599 | init_completion(&orb->done); |
| 600 | orb->base.callback = complete_management_orb; |
| 601 | |
| 602 | orb->base.request_bus = |
| 603 | dma_map_single(device->card->device, &orb->request, |
| 604 | sizeof(orb->request), DMA_TO_DEVICE); |
| 605 | if (dma_mapping_error(device->card->device, orb->base.request_bus)) |
| 606 | goto fail_mapping_request; |
| 607 | |
| 608 | sbp2_send_orb(&orb->base, lu, node_id, generation, |
| 609 | lu->tgt->management_agent_address); |
| 610 | |
| 611 | wait_for_completion_timeout(&orb->done, msecs_to_jiffies(timeout)); |
| 612 | |
| 613 | retval = -EIO; |
| 614 | if (sbp2_cancel_orbs(lu) == 0) { |
| 615 | fw_error("%s: orb reply timed out, rcode=0x%02x\n", |
| 616 | lu->tgt->bus_id, orb->base.rcode); |
| 617 | goto out; |
| 618 | } |
| 619 | |
| 620 | if (orb->base.rcode != RCODE_COMPLETE) { |
| 621 | fw_error("%s: management write failed, rcode 0x%02x\n", |
| 622 | lu->tgt->bus_id, orb->base.rcode); |
| 623 | goto out; |
| 624 | } |
| 625 | |
| 626 | if (STATUS_GET_RESPONSE(orb->status) != 0 || |
| 627 | STATUS_GET_SBP_STATUS(orb->status) != 0) { |
| 628 | fw_error("%s: error status: %d:%d\n", lu->tgt->bus_id, |
| 629 | STATUS_GET_RESPONSE(orb->status), |
| 630 | STATUS_GET_SBP_STATUS(orb->status)); |
| 631 | goto out; |
| 632 | } |
| 633 | |
| 634 | retval = 0; |
| 635 | out: |
| 636 | dma_unmap_single(device->card->device, orb->base.request_bus, |
| 637 | sizeof(orb->request), DMA_TO_DEVICE); |
| 638 | fail_mapping_request: |
| 639 | dma_unmap_single(device->card->device, orb->response_bus, |
| 640 | sizeof(orb->response), DMA_FROM_DEVICE); |
| 641 | fail_mapping_response: |
| 642 | if (response) |
| 643 | memcpy(response, orb->response, sizeof(orb->response)); |
| 644 | kref_put(&orb->base.kref, free_orb); |
| 645 | |
| 646 | return retval; |
| 647 | } |
| 648 | |
| 649 | static void sbp2_agent_reset(struct sbp2_logical_unit *lu) |
| 650 | { |
| 651 | struct fw_device *device = target_device(lu->tgt); |
| 652 | __be32 d = 0; |
| 653 | |
| 654 | fw_run_transaction(device->card, TCODE_WRITE_QUADLET_REQUEST, |
| 655 | lu->tgt->node_id, lu->generation, device->max_speed, |
| 656 | lu->command_block_agent_address + SBP2_AGENT_RESET, |
| 657 | &d, sizeof(d)); |
| 658 | } |
| 659 | |
| 660 | static void complete_agent_reset_write_no_wait(struct fw_card *card, |
| 661 | int rcode, void *payload, size_t length, void *data) |
| 662 | { |
| 663 | kfree(data); |
| 664 | } |
| 665 | |
| 666 | static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu) |
| 667 | { |
| 668 | struct fw_device *device = target_device(lu->tgt); |
| 669 | struct fw_transaction *t; |
| 670 | static __be32 d; |
| 671 | |
| 672 | t = kmalloc(sizeof(*t), GFP_ATOMIC); |
| 673 | if (t == NULL) |
| 674 | return; |
| 675 | |
| 676 | fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST, |
| 677 | lu->tgt->node_id, lu->generation, device->max_speed, |
| 678 | lu->command_block_agent_address + SBP2_AGENT_RESET, |
| 679 | &d, sizeof(d), complete_agent_reset_write_no_wait, t); |
| 680 | } |
| 681 | |
| 682 | static inline void sbp2_allow_block(struct sbp2_logical_unit *lu) |
| 683 | { |
| 684 | /* |
| 685 | * We may access dont_block without taking card->lock here: |
| 686 | * All callers of sbp2_allow_block() and all callers of sbp2_unblock() |
| 687 | * are currently serialized against each other. |
| 688 | * And a wrong result in sbp2_conditionally_block()'s access of |
| 689 | * dont_block is rather harmless, it simply misses its first chance. |
| 690 | */ |
| 691 | --lu->tgt->dont_block; |
| 692 | } |
| 693 | |
| 694 | /* |
| 695 | * Blocks lu->tgt if all of the following conditions are met: |
| 696 | * - Login, INQUIRY, and high-level SCSI setup of all of the target's |
| 697 | * logical units have been finished (indicated by dont_block == 0). |
| 698 | * - lu->generation is stale. |
| 699 | * |
| 700 | * Note, scsi_block_requests() must be called while holding card->lock, |
| 701 | * otherwise it might foil sbp2_[conditionally_]unblock()'s attempt to |
| 702 | * unblock the target. |
| 703 | */ |
| 704 | static void sbp2_conditionally_block(struct sbp2_logical_unit *lu) |
| 705 | { |
| 706 | struct sbp2_target *tgt = lu->tgt; |
| 707 | struct fw_card *card = target_device(tgt)->card; |
| 708 | struct Scsi_Host *shost = |
| 709 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
| 710 | unsigned long flags; |
| 711 | |
| 712 | spin_lock_irqsave(&card->lock, flags); |
| 713 | if (!tgt->dont_block && !lu->blocked && |
| 714 | lu->generation != card->generation) { |
| 715 | lu->blocked = true; |
| 716 | if (++tgt->blocked == 1) |
| 717 | scsi_block_requests(shost); |
| 718 | } |
| 719 | spin_unlock_irqrestore(&card->lock, flags); |
| 720 | } |
| 721 | |
| 722 | /* |
| 723 | * Unblocks lu->tgt as soon as all its logical units can be unblocked. |
| 724 | * Note, it is harmless to run scsi_unblock_requests() outside the |
| 725 | * card->lock protected section. On the other hand, running it inside |
| 726 | * the section might clash with shost->host_lock. |
| 727 | */ |
| 728 | static void sbp2_conditionally_unblock(struct sbp2_logical_unit *lu) |
| 729 | { |
| 730 | struct sbp2_target *tgt = lu->tgt; |
| 731 | struct fw_card *card = target_device(tgt)->card; |
| 732 | struct Scsi_Host *shost = |
| 733 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
| 734 | unsigned long flags; |
| 735 | bool unblock = false; |
| 736 | |
| 737 | spin_lock_irqsave(&card->lock, flags); |
| 738 | if (lu->blocked && lu->generation == card->generation) { |
| 739 | lu->blocked = false; |
| 740 | unblock = --tgt->blocked == 0; |
| 741 | } |
| 742 | spin_unlock_irqrestore(&card->lock, flags); |
| 743 | |
| 744 | if (unblock) |
| 745 | scsi_unblock_requests(shost); |
| 746 | } |
| 747 | |
| 748 | /* |
| 749 | * Prevents future blocking of tgt and unblocks it. |
| 750 | * Note, it is harmless to run scsi_unblock_requests() outside the |
| 751 | * card->lock protected section. On the other hand, running it inside |
| 752 | * the section might clash with shost->host_lock. |
| 753 | */ |
| 754 | static void sbp2_unblock(struct sbp2_target *tgt) |
| 755 | { |
| 756 | struct fw_card *card = target_device(tgt)->card; |
| 757 | struct Scsi_Host *shost = |
| 758 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
| 759 | unsigned long flags; |
| 760 | |
| 761 | spin_lock_irqsave(&card->lock, flags); |
| 762 | ++tgt->dont_block; |
| 763 | spin_unlock_irqrestore(&card->lock, flags); |
| 764 | |
| 765 | scsi_unblock_requests(shost); |
| 766 | } |
| 767 | |
| 768 | static int sbp2_lun2int(u16 lun) |
| 769 | { |
| 770 | struct scsi_lun eight_bytes_lun; |
| 771 | |
| 772 | memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun)); |
| 773 | eight_bytes_lun.scsi_lun[0] = (lun >> 8) & 0xff; |
| 774 | eight_bytes_lun.scsi_lun[1] = lun & 0xff; |
| 775 | |
| 776 | return scsilun_to_int(&eight_bytes_lun); |
| 777 | } |
| 778 | |
| 779 | static void sbp2_release_target(struct kref *kref) |
| 780 | { |
| 781 | struct sbp2_target *tgt = container_of(kref, struct sbp2_target, kref); |
| 782 | struct sbp2_logical_unit *lu, *next; |
| 783 | struct Scsi_Host *shost = |
| 784 | container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
| 785 | struct scsi_device *sdev; |
| 786 | struct fw_device *device = target_device(tgt); |
| 787 | |
| 788 | /* prevent deadlocks */ |
| 789 | sbp2_unblock(tgt); |
| 790 | |
| 791 | list_for_each_entry_safe(lu, next, &tgt->lu_list, link) { |
| 792 | sdev = scsi_device_lookup(shost, 0, 0, sbp2_lun2int(lu->lun)); |
| 793 | if (sdev) { |
| 794 | scsi_remove_device(sdev); |
| 795 | scsi_device_put(sdev); |
| 796 | } |
| 797 | if (lu->login_id != INVALID_LOGIN_ID) { |
| 798 | int generation, node_id; |
| 799 | /* |
| 800 | * tgt->node_id may be obsolete here if we failed |
| 801 | * during initial login or after a bus reset where |
| 802 | * the topology changed. |
| 803 | */ |
| 804 | generation = device->generation; |
| 805 | smp_rmb(); /* node_id vs. generation */ |
| 806 | node_id = device->node_id; |
| 807 | sbp2_send_management_orb(lu, node_id, generation, |
| 808 | SBP2_LOGOUT_REQUEST, |
| 809 | lu->login_id, NULL); |
| 810 | } |
| 811 | fw_core_remove_address_handler(&lu->address_handler); |
| 812 | list_del(&lu->link); |
| 813 | kfree(lu); |
| 814 | } |
| 815 | scsi_remove_host(shost); |
| 816 | fw_notify("released %s, target %d:0:0\n", tgt->bus_id, shost->host_no); |
| 817 | |
| 818 | fw_unit_put(tgt->unit); |
| 819 | scsi_host_put(shost); |
| 820 | fw_device_put(device); |
| 821 | } |
| 822 | |
| 823 | static void sbp2_target_get(struct sbp2_target *tgt) |
| 824 | { |
| 825 | kref_get(&tgt->kref); |
| 826 | } |
| 827 | |
| 828 | static void sbp2_target_put(struct sbp2_target *tgt) |
| 829 | { |
| 830 | kref_put(&tgt->kref, sbp2_release_target); |
| 831 | } |
| 832 | |
| 833 | static struct workqueue_struct *sbp2_wq; |
| 834 | |
| 835 | /* |
| 836 | * Always get the target's kref when scheduling work on one its units. |
| 837 | * Each workqueue job is responsible to call sbp2_target_put() upon return. |
| 838 | */ |
| 839 | static void sbp2_queue_work(struct sbp2_logical_unit *lu, unsigned long delay) |
| 840 | { |
| 841 | sbp2_target_get(lu->tgt); |
| 842 | if (!queue_delayed_work(sbp2_wq, &lu->work, delay)) |
| 843 | sbp2_target_put(lu->tgt); |
| 844 | } |
| 845 | |
| 846 | /* |
| 847 | * Write retransmit retry values into the BUSY_TIMEOUT register. |
| 848 | * - The single-phase retry protocol is supported by all SBP-2 devices, but the |
| 849 | * default retry_limit value is 0 (i.e. never retry transmission). We write a |
| 850 | * saner value after logging into the device. |
| 851 | * - The dual-phase retry protocol is optional to implement, and if not |
| 852 | * supported, writes to the dual-phase portion of the register will be |
| 853 | * ignored. We try to write the original 1394-1995 default here. |
| 854 | * - In the case of devices that are also SBP-3-compliant, all writes are |
| 855 | * ignored, as the register is read-only, but contains single-phase retry of |
| 856 | * 15, which is what we're trying to set for all SBP-2 device anyway, so this |
| 857 | * write attempt is safe and yields more consistent behavior for all devices. |
| 858 | * |
| 859 | * See section 8.3.2.3.5 of the 1394-1995 spec, section 6.2 of the SBP-2 spec, |
| 860 | * and section 6.4 of the SBP-3 spec for further details. |
| 861 | */ |
| 862 | static void sbp2_set_busy_timeout(struct sbp2_logical_unit *lu) |
| 863 | { |
| 864 | struct fw_device *device = target_device(lu->tgt); |
| 865 | __be32 d = cpu_to_be32(SBP2_CYCLE_LIMIT | SBP2_RETRY_LIMIT); |
| 866 | |
| 867 | fw_run_transaction(device->card, TCODE_WRITE_QUADLET_REQUEST, |
| 868 | lu->tgt->node_id, lu->generation, device->max_speed, |
| 869 | CSR_REGISTER_BASE + CSR_BUSY_TIMEOUT, |
| 870 | &d, sizeof(d)); |
| 871 | } |
| 872 | |
| 873 | static void sbp2_reconnect(struct work_struct *work); |
| 874 | |
| 875 | static void sbp2_login(struct work_struct *work) |
| 876 | { |
| 877 | struct sbp2_logical_unit *lu = |
| 878 | container_of(work, struct sbp2_logical_unit, work.work); |
| 879 | struct sbp2_target *tgt = lu->tgt; |
| 880 | struct fw_device *device = target_device(tgt); |
| 881 | struct Scsi_Host *shost; |
| 882 | struct scsi_device *sdev; |
| 883 | struct sbp2_login_response response; |
| 884 | int generation, node_id, local_node_id; |
| 885 | |
| 886 | if (fw_device_is_shutdown(device)) |
| 887 | goto out; |
| 888 | |
| 889 | generation = device->generation; |
| 890 | smp_rmb(); /* node IDs must not be older than generation */ |
| 891 | node_id = device->node_id; |
| 892 | local_node_id = device->card->node_id; |
| 893 | |
| 894 | /* If this is a re-login attempt, log out, or we might be rejected. */ |
| 895 | if (lu->has_sdev) |
| 896 | sbp2_send_management_orb(lu, device->node_id, generation, |
| 897 | SBP2_LOGOUT_REQUEST, lu->login_id, NULL); |
| 898 | |
| 899 | if (sbp2_send_management_orb(lu, node_id, generation, |
| 900 | SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) { |
| 901 | if (lu->retries++ < 5) { |
| 902 | sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5)); |
| 903 | } else { |
| 904 | fw_error("%s: failed to login to LUN %04x\n", |
| 905 | tgt->bus_id, lu->lun); |
| 906 | /* Let any waiting I/O fail from now on. */ |
| 907 | sbp2_unblock(lu->tgt); |
| 908 | } |
| 909 | goto out; |
| 910 | } |
| 911 | |
| 912 | tgt->node_id = node_id; |
| 913 | tgt->address_high = local_node_id << 16; |
| 914 | smp_wmb(); /* node IDs must not be older than generation */ |
| 915 | lu->generation = generation; |
| 916 | |
| 917 | lu->command_block_agent_address = |
| 918 | ((u64)(be32_to_cpu(response.command_block_agent.high) & 0xffff) |
| 919 | << 32) | be32_to_cpu(response.command_block_agent.low); |
| 920 | lu->login_id = be32_to_cpu(response.misc) & 0xffff; |
| 921 | |
| 922 | fw_notify("%s: logged in to LUN %04x (%d retries)\n", |
| 923 | tgt->bus_id, lu->lun, lu->retries); |
| 924 | |
| 925 | /* set appropriate retry limit(s) in BUSY_TIMEOUT register */ |
| 926 | sbp2_set_busy_timeout(lu); |
| 927 | |
| 928 | PREPARE_DELAYED_WORK(&lu->work, sbp2_reconnect); |
| 929 | sbp2_agent_reset(lu); |
| 930 | |
| 931 | /* This was a re-login. */ |
| 932 | if (lu->has_sdev) { |
| 933 | sbp2_cancel_orbs(lu); |
| 934 | sbp2_conditionally_unblock(lu); |
| 935 | goto out; |
| 936 | } |
| 937 | |
| 938 | if (lu->tgt->workarounds & SBP2_WORKAROUND_DELAY_INQUIRY) |
| 939 | ssleep(SBP2_INQUIRY_DELAY); |
| 940 | |
| 941 | shost = container_of((void *)tgt, struct Scsi_Host, hostdata[0]); |
| 942 | sdev = __scsi_add_device(shost, 0, 0, sbp2_lun2int(lu->lun), lu); |
| 943 | /* |
| 944 | * FIXME: We are unable to perform reconnects while in sbp2_login(). |
| 945 | * Therefore __scsi_add_device() will get into trouble if a bus reset |
| 946 | * happens in parallel. It will either fail or leave us with an |
| 947 | * unusable sdev. As a workaround we check for this and retry the |
| 948 | * whole login and SCSI probing. |
| 949 | */ |
| 950 | |
| 951 | /* Reported error during __scsi_add_device() */ |
| 952 | if (IS_ERR(sdev)) |
| 953 | goto out_logout_login; |
| 954 | |
| 955 | /* Unreported error during __scsi_add_device() */ |
| 956 | smp_rmb(); /* get current card generation */ |
| 957 | if (generation != device->card->generation) { |
| 958 | scsi_remove_device(sdev); |
| 959 | scsi_device_put(sdev); |
| 960 | goto out_logout_login; |
| 961 | } |
| 962 | |
| 963 | /* No error during __scsi_add_device() */ |
| 964 | lu->has_sdev = true; |
| 965 | scsi_device_put(sdev); |
| 966 | sbp2_allow_block(lu); |
| 967 | goto out; |
| 968 | |
| 969 | out_logout_login: |
| 970 | smp_rmb(); /* generation may have changed */ |
| 971 | generation = device->generation; |
| 972 | smp_rmb(); /* node_id must not be older than generation */ |
| 973 | |
| 974 | sbp2_send_management_orb(lu, device->node_id, generation, |
| 975 | SBP2_LOGOUT_REQUEST, lu->login_id, NULL); |
| 976 | /* |
| 977 | * If a bus reset happened, sbp2_update will have requeued |
| 978 | * lu->work already. Reset the work from reconnect to login. |
| 979 | */ |
| 980 | PREPARE_DELAYED_WORK(&lu->work, sbp2_login); |
| 981 | out: |
| 982 | sbp2_target_put(tgt); |
| 983 | } |
| 984 | |
| 985 | static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry) |
| 986 | { |
| 987 | struct sbp2_logical_unit *lu; |
| 988 | |
| 989 | lu = kmalloc(sizeof(*lu), GFP_KERNEL); |
| 990 | if (!lu) |
| 991 | return -ENOMEM; |
| 992 | |
| 993 | lu->address_handler.length = 0x100; |
| 994 | lu->address_handler.address_callback = sbp2_status_write; |
| 995 | lu->address_handler.callback_data = lu; |
| 996 | |
| 997 | if (fw_core_add_address_handler(&lu->address_handler, |
| 998 | &fw_high_memory_region) < 0) { |
| 999 | kfree(lu); |
| 1000 | return -ENOMEM; |
| 1001 | } |
| 1002 | |
| 1003 | lu->tgt = tgt; |
| 1004 | lu->lun = lun_entry & 0xffff; |
| 1005 | lu->login_id = INVALID_LOGIN_ID; |
| 1006 | lu->retries = 0; |
| 1007 | lu->has_sdev = false; |
| 1008 | lu->blocked = false; |
| 1009 | ++tgt->dont_block; |
| 1010 | INIT_LIST_HEAD(&lu->orb_list); |
| 1011 | INIT_DELAYED_WORK(&lu->work, sbp2_login); |
| 1012 | |
| 1013 | list_add_tail(&lu->link, &tgt->lu_list); |
| 1014 | return 0; |
| 1015 | } |
| 1016 | |
| 1017 | static int sbp2_scan_logical_unit_dir(struct sbp2_target *tgt, |
| 1018 | const u32 *directory) |
| 1019 | { |
| 1020 | struct fw_csr_iterator ci; |
| 1021 | int key, value; |
| 1022 | |
| 1023 | fw_csr_iterator_init(&ci, directory); |
| 1024 | while (fw_csr_iterator_next(&ci, &key, &value)) |
| 1025 | if (key == SBP2_CSR_LOGICAL_UNIT_NUMBER && |
| 1026 | sbp2_add_logical_unit(tgt, value) < 0) |
| 1027 | return -ENOMEM; |
| 1028 | return 0; |
| 1029 | } |
| 1030 | |
| 1031 | static int sbp2_scan_unit_dir(struct sbp2_target *tgt, const u32 *directory, |
| 1032 | u32 *model, u32 *firmware_revision) |
| 1033 | { |
| 1034 | struct fw_csr_iterator ci; |
| 1035 | int key, value; |
| 1036 | |
| 1037 | fw_csr_iterator_init(&ci, directory); |
| 1038 | while (fw_csr_iterator_next(&ci, &key, &value)) { |
| 1039 | switch (key) { |
| 1040 | |
| 1041 | case CSR_DEPENDENT_INFO | CSR_OFFSET: |
| 1042 | tgt->management_agent_address = |
| 1043 | CSR_REGISTER_BASE + 4 * value; |
| 1044 | break; |
| 1045 | |
| 1046 | case CSR_DIRECTORY_ID: |
| 1047 | tgt->directory_id = value; |
| 1048 | break; |
| 1049 | |
| 1050 | case CSR_MODEL: |
| 1051 | *model = value; |
| 1052 | break; |
| 1053 | |
| 1054 | case SBP2_CSR_FIRMWARE_REVISION: |
| 1055 | *firmware_revision = value; |
| 1056 | break; |
| 1057 | |
| 1058 | case SBP2_CSR_UNIT_CHARACTERISTICS: |
| 1059 | /* the timeout value is stored in 500ms units */ |
| 1060 | tgt->mgt_orb_timeout = (value >> 8 & 0xff) * 500; |
| 1061 | break; |
| 1062 | |
| 1063 | case SBP2_CSR_LOGICAL_UNIT_NUMBER: |
| 1064 | if (sbp2_add_logical_unit(tgt, value) < 0) |
| 1065 | return -ENOMEM; |
| 1066 | break; |
| 1067 | |
| 1068 | case SBP2_CSR_LOGICAL_UNIT_DIRECTORY: |
| 1069 | /* Adjust for the increment in the iterator */ |
| 1070 | if (sbp2_scan_logical_unit_dir(tgt, ci.p - 1 + value) < 0) |
| 1071 | return -ENOMEM; |
| 1072 | break; |
| 1073 | } |
| 1074 | } |
| 1075 | return 0; |
| 1076 | } |
| 1077 | |
| 1078 | /* |
| 1079 | * Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be |
| 1080 | * provided in the config rom. Most devices do provide a value, which |
| 1081 | * we'll use for login management orbs, but with some sane limits. |
| 1082 | */ |
| 1083 | static void sbp2_clamp_management_orb_timeout(struct sbp2_target *tgt) |
| 1084 | { |
| 1085 | unsigned int timeout = tgt->mgt_orb_timeout; |
| 1086 | |
| 1087 | if (timeout > 40000) |
| 1088 | fw_notify("%s: %ds mgt_ORB_timeout limited to 40s\n", |
| 1089 | tgt->bus_id, timeout / 1000); |
| 1090 | |
| 1091 | tgt->mgt_orb_timeout = clamp_val(timeout, 5000, 40000); |
| 1092 | } |
| 1093 | |
| 1094 | static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model, |
| 1095 | u32 firmware_revision) |
| 1096 | { |
| 1097 | int i; |
| 1098 | unsigned int w = sbp2_param_workarounds; |
| 1099 | |
| 1100 | if (w) |
| 1101 | fw_notify("Please notify linux1394-devel@lists.sourceforge.net " |
| 1102 | "if you need the workarounds parameter for %s\n", |
| 1103 | tgt->bus_id); |
| 1104 | |
| 1105 | if (w & SBP2_WORKAROUND_OVERRIDE) |
| 1106 | goto out; |
| 1107 | |
| 1108 | for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) { |
| 1109 | |
| 1110 | if (sbp2_workarounds_table[i].firmware_revision != |
| 1111 | (firmware_revision & 0xffffff00)) |
| 1112 | continue; |
| 1113 | |
| 1114 | if (sbp2_workarounds_table[i].model != model && |
| 1115 | sbp2_workarounds_table[i].model != SBP2_ROM_VALUE_WILDCARD) |
| 1116 | continue; |
| 1117 | |
| 1118 | w |= sbp2_workarounds_table[i].workarounds; |
| 1119 | break; |
| 1120 | } |
| 1121 | out: |
| 1122 | if (w) |
| 1123 | fw_notify("Workarounds for %s: 0x%x " |
| 1124 | "(firmware_revision 0x%06x, model_id 0x%06x)\n", |
| 1125 | tgt->bus_id, w, firmware_revision, model); |
| 1126 | tgt->workarounds = w; |
| 1127 | } |
| 1128 | |
| 1129 | static struct scsi_host_template scsi_driver_template; |
| 1130 | |
| 1131 | static int sbp2_probe(struct device *dev) |
| 1132 | { |
| 1133 | struct fw_unit *unit = fw_unit(dev); |
| 1134 | struct fw_device *device = fw_parent_device(unit); |
| 1135 | struct sbp2_target *tgt; |
| 1136 | struct sbp2_logical_unit *lu; |
| 1137 | struct Scsi_Host *shost; |
| 1138 | u32 model, firmware_revision; |
| 1139 | |
| 1140 | if (dma_get_max_seg_size(device->card->device) > SBP2_MAX_SEG_SIZE) |
| 1141 | BUG_ON(dma_set_max_seg_size(device->card->device, |
| 1142 | SBP2_MAX_SEG_SIZE)); |
| 1143 | |
| 1144 | shost = scsi_host_alloc(&scsi_driver_template, sizeof(*tgt)); |
| 1145 | if (shost == NULL) |
| 1146 | return -ENOMEM; |
| 1147 | |
| 1148 | tgt = (struct sbp2_target *)shost->hostdata; |
| 1149 | dev_set_drvdata(&unit->device, tgt); |
| 1150 | tgt->unit = unit; |
| 1151 | kref_init(&tgt->kref); |
| 1152 | INIT_LIST_HEAD(&tgt->lu_list); |
| 1153 | tgt->bus_id = dev_name(&unit->device); |
| 1154 | tgt->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4]; |
| 1155 | |
| 1156 | if (fw_device_enable_phys_dma(device) < 0) |
| 1157 | goto fail_shost_put; |
| 1158 | |
| 1159 | shost->max_cmd_len = SBP2_MAX_CDB_SIZE; |
| 1160 | |
| 1161 | if (scsi_add_host(shost, &unit->device) < 0) |
| 1162 | goto fail_shost_put; |
| 1163 | |
| 1164 | fw_device_get(device); |
| 1165 | fw_unit_get(unit); |
| 1166 | |
| 1167 | /* implicit directory ID */ |
| 1168 | tgt->directory_id = ((unit->directory - device->config_rom) * 4 |
| 1169 | + CSR_CONFIG_ROM) & 0xffffff; |
| 1170 | |
| 1171 | firmware_revision = SBP2_ROM_VALUE_MISSING; |
| 1172 | model = SBP2_ROM_VALUE_MISSING; |
| 1173 | |
| 1174 | if (sbp2_scan_unit_dir(tgt, unit->directory, &model, |
| 1175 | &firmware_revision) < 0) |
| 1176 | goto fail_tgt_put; |
| 1177 | |
| 1178 | sbp2_clamp_management_orb_timeout(tgt); |
| 1179 | sbp2_init_workarounds(tgt, model, firmware_revision); |
| 1180 | |
| 1181 | /* |
| 1182 | * At S100 we can do 512 bytes per packet, at S200 1024 bytes, |
| 1183 | * and so on up to 4096 bytes. The SBP-2 max_payload field |
| 1184 | * specifies the max payload size as 2 ^ (max_payload + 2), so |
| 1185 | * if we set this to max_speed + 7, we get the right value. |
| 1186 | */ |
| 1187 | tgt->max_payload = min(device->max_speed + 7, 10U); |
| 1188 | tgt->max_payload = min(tgt->max_payload, device->card->max_receive - 1); |
| 1189 | |
| 1190 | /* Do the login in a workqueue so we can easily reschedule retries. */ |
| 1191 | list_for_each_entry(lu, &tgt->lu_list, link) |
| 1192 | sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5)); |
| 1193 | return 0; |
| 1194 | |
| 1195 | fail_tgt_put: |
| 1196 | sbp2_target_put(tgt); |
| 1197 | return -ENOMEM; |
| 1198 | |
| 1199 | fail_shost_put: |
| 1200 | scsi_host_put(shost); |
| 1201 | return -ENOMEM; |
| 1202 | } |
| 1203 | |
| 1204 | static int sbp2_remove(struct device *dev) |
| 1205 | { |
| 1206 | struct fw_unit *unit = fw_unit(dev); |
| 1207 | struct sbp2_target *tgt = dev_get_drvdata(&unit->device); |
| 1208 | |
| 1209 | sbp2_target_put(tgt); |
| 1210 | return 0; |
| 1211 | } |
| 1212 | |
| 1213 | static void sbp2_reconnect(struct work_struct *work) |
| 1214 | { |
| 1215 | struct sbp2_logical_unit *lu = |
| 1216 | container_of(work, struct sbp2_logical_unit, work.work); |
| 1217 | struct sbp2_target *tgt = lu->tgt; |
| 1218 | struct fw_device *device = target_device(tgt); |
| 1219 | int generation, node_id, local_node_id; |
| 1220 | |
| 1221 | if (fw_device_is_shutdown(device)) |
| 1222 | goto out; |
| 1223 | |
| 1224 | generation = device->generation; |
| 1225 | smp_rmb(); /* node IDs must not be older than generation */ |
| 1226 | node_id = device->node_id; |
| 1227 | local_node_id = device->card->node_id; |
| 1228 | |
| 1229 | if (sbp2_send_management_orb(lu, node_id, generation, |
| 1230 | SBP2_RECONNECT_REQUEST, |
| 1231 | lu->login_id, NULL) < 0) { |
| 1232 | /* |
| 1233 | * If reconnect was impossible even though we are in the |
| 1234 | * current generation, fall back and try to log in again. |
| 1235 | * |
| 1236 | * We could check for "Function rejected" status, but |
| 1237 | * looking at the bus generation as simpler and more general. |
| 1238 | */ |
| 1239 | smp_rmb(); /* get current card generation */ |
| 1240 | if (generation == device->card->generation || |
| 1241 | lu->retries++ >= 5) { |
| 1242 | fw_error("%s: failed to reconnect\n", tgt->bus_id); |
| 1243 | lu->retries = 0; |
| 1244 | PREPARE_DELAYED_WORK(&lu->work, sbp2_login); |
| 1245 | } |
| 1246 | sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5)); |
| 1247 | goto out; |
| 1248 | } |
| 1249 | |
| 1250 | tgt->node_id = node_id; |
| 1251 | tgt->address_high = local_node_id << 16; |
| 1252 | smp_wmb(); /* node IDs must not be older than generation */ |
| 1253 | lu->generation = generation; |
| 1254 | |
| 1255 | fw_notify("%s: reconnected to LUN %04x (%d retries)\n", |
| 1256 | tgt->bus_id, lu->lun, lu->retries); |
| 1257 | |
| 1258 | sbp2_agent_reset(lu); |
| 1259 | sbp2_cancel_orbs(lu); |
| 1260 | sbp2_conditionally_unblock(lu); |
| 1261 | out: |
| 1262 | sbp2_target_put(tgt); |
| 1263 | } |
| 1264 | |
| 1265 | static void sbp2_update(struct fw_unit *unit) |
| 1266 | { |
| 1267 | struct sbp2_target *tgt = dev_get_drvdata(&unit->device); |
| 1268 | struct sbp2_logical_unit *lu; |
| 1269 | |
| 1270 | fw_device_enable_phys_dma(fw_parent_device(unit)); |
| 1271 | |
| 1272 | /* |
| 1273 | * Fw-core serializes sbp2_update() against sbp2_remove(). |
| 1274 | * Iteration over tgt->lu_list is therefore safe here. |
| 1275 | */ |
| 1276 | list_for_each_entry(lu, &tgt->lu_list, link) { |
| 1277 | sbp2_conditionally_block(lu); |
| 1278 | lu->retries = 0; |
| 1279 | sbp2_queue_work(lu, 0); |
| 1280 | } |
| 1281 | } |
| 1282 | |
| 1283 | #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e |
| 1284 | #define SBP2_SW_VERSION_ENTRY 0x00010483 |
| 1285 | |
| 1286 | static const struct ieee1394_device_id sbp2_id_table[] = { |
| 1287 | { |
| 1288 | .match_flags = IEEE1394_MATCH_SPECIFIER_ID | |
| 1289 | IEEE1394_MATCH_VERSION, |
| 1290 | .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY, |
| 1291 | .version = SBP2_SW_VERSION_ENTRY, |
| 1292 | }, |
| 1293 | { } |
| 1294 | }; |
| 1295 | |
| 1296 | static struct fw_driver sbp2_driver = { |
| 1297 | .driver = { |
| 1298 | .owner = THIS_MODULE, |
| 1299 | .name = sbp2_driver_name, |
| 1300 | .bus = &fw_bus_type, |
| 1301 | .probe = sbp2_probe, |
| 1302 | .remove = sbp2_remove, |
| 1303 | }, |
| 1304 | .update = sbp2_update, |
| 1305 | .id_table = sbp2_id_table, |
| 1306 | }; |
| 1307 | |
| 1308 | static void sbp2_unmap_scatterlist(struct device *card_device, |
| 1309 | struct sbp2_command_orb *orb) |
| 1310 | { |
| 1311 | if (scsi_sg_count(orb->cmd)) |
| 1312 | dma_unmap_sg(card_device, scsi_sglist(orb->cmd), |
| 1313 | scsi_sg_count(orb->cmd), |
| 1314 | orb->cmd->sc_data_direction); |
| 1315 | |
| 1316 | if (orb->request.misc & cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT)) |
| 1317 | dma_unmap_single(card_device, orb->page_table_bus, |
| 1318 | sizeof(orb->page_table), DMA_TO_DEVICE); |
| 1319 | } |
| 1320 | |
| 1321 | static unsigned int sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data) |
| 1322 | { |
| 1323 | int sam_status; |
| 1324 | |
| 1325 | sense_data[0] = 0x70; |
| 1326 | sense_data[1] = 0x0; |
| 1327 | sense_data[2] = sbp2_status[1]; |
| 1328 | sense_data[3] = sbp2_status[4]; |
| 1329 | sense_data[4] = sbp2_status[5]; |
| 1330 | sense_data[5] = sbp2_status[6]; |
| 1331 | sense_data[6] = sbp2_status[7]; |
| 1332 | sense_data[7] = 10; |
| 1333 | sense_data[8] = sbp2_status[8]; |
| 1334 | sense_data[9] = sbp2_status[9]; |
| 1335 | sense_data[10] = sbp2_status[10]; |
| 1336 | sense_data[11] = sbp2_status[11]; |
| 1337 | sense_data[12] = sbp2_status[2]; |
| 1338 | sense_data[13] = sbp2_status[3]; |
| 1339 | sense_data[14] = sbp2_status[12]; |
| 1340 | sense_data[15] = sbp2_status[13]; |
| 1341 | |
| 1342 | sam_status = sbp2_status[0] & 0x3f; |
| 1343 | |
| 1344 | switch (sam_status) { |
| 1345 | case SAM_STAT_GOOD: |
| 1346 | case SAM_STAT_CHECK_CONDITION: |
| 1347 | case SAM_STAT_CONDITION_MET: |
| 1348 | case SAM_STAT_BUSY: |
| 1349 | case SAM_STAT_RESERVATION_CONFLICT: |
| 1350 | case SAM_STAT_COMMAND_TERMINATED: |
| 1351 | return DID_OK << 16 | sam_status; |
| 1352 | |
| 1353 | default: |
| 1354 | return DID_ERROR << 16; |
| 1355 | } |
| 1356 | } |
| 1357 | |
| 1358 | static void complete_command_orb(struct sbp2_orb *base_orb, |
| 1359 | struct sbp2_status *status) |
| 1360 | { |
| 1361 | struct sbp2_command_orb *orb = |
| 1362 | container_of(base_orb, struct sbp2_command_orb, base); |
| 1363 | struct fw_device *device = target_device(orb->lu->tgt); |
| 1364 | int result; |
| 1365 | |
| 1366 | if (status != NULL) { |
| 1367 | if (STATUS_GET_DEAD(*status)) |
| 1368 | sbp2_agent_reset_no_wait(orb->lu); |
| 1369 | |
| 1370 | switch (STATUS_GET_RESPONSE(*status)) { |
| 1371 | case SBP2_STATUS_REQUEST_COMPLETE: |
| 1372 | result = DID_OK << 16; |
| 1373 | break; |
| 1374 | case SBP2_STATUS_TRANSPORT_FAILURE: |
| 1375 | result = DID_BUS_BUSY << 16; |
| 1376 | break; |
| 1377 | case SBP2_STATUS_ILLEGAL_REQUEST: |
| 1378 | case SBP2_STATUS_VENDOR_DEPENDENT: |
| 1379 | default: |
| 1380 | result = DID_ERROR << 16; |
| 1381 | break; |
| 1382 | } |
| 1383 | |
| 1384 | if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1) |
| 1385 | result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status), |
| 1386 | orb->cmd->sense_buffer); |
| 1387 | } else { |
| 1388 | /* |
| 1389 | * If the orb completes with status == NULL, something |
| 1390 | * went wrong, typically a bus reset happened mid-orb |
| 1391 | * or when sending the write (less likely). |
| 1392 | */ |
| 1393 | result = DID_BUS_BUSY << 16; |
| 1394 | sbp2_conditionally_block(orb->lu); |
| 1395 | } |
| 1396 | |
| 1397 | dma_unmap_single(device->card->device, orb->base.request_bus, |
| 1398 | sizeof(orb->request), DMA_TO_DEVICE); |
| 1399 | sbp2_unmap_scatterlist(device->card->device, orb); |
| 1400 | |
| 1401 | orb->cmd->result = result; |
| 1402 | orb->done(orb->cmd); |
| 1403 | } |
| 1404 | |
| 1405 | static int sbp2_map_scatterlist(struct sbp2_command_orb *orb, |
| 1406 | struct fw_device *device, struct sbp2_logical_unit *lu) |
| 1407 | { |
| 1408 | struct scatterlist *sg = scsi_sglist(orb->cmd); |
| 1409 | int i, n; |
| 1410 | |
| 1411 | n = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd), |
| 1412 | orb->cmd->sc_data_direction); |
| 1413 | if (n == 0) |
| 1414 | goto fail; |
| 1415 | |
| 1416 | /* |
| 1417 | * Handle the special case where there is only one element in |
| 1418 | * the scatter list by converting it to an immediate block |
| 1419 | * request. This is also a workaround for broken devices such |
| 1420 | * as the second generation iPod which doesn't support page |
| 1421 | * tables. |
| 1422 | */ |
| 1423 | if (n == 1) { |
| 1424 | orb->request.data_descriptor.high = |
| 1425 | cpu_to_be32(lu->tgt->address_high); |
| 1426 | orb->request.data_descriptor.low = |
| 1427 | cpu_to_be32(sg_dma_address(sg)); |
| 1428 | orb->request.misc |= |
| 1429 | cpu_to_be32(COMMAND_ORB_DATA_SIZE(sg_dma_len(sg))); |
| 1430 | return 0; |
| 1431 | } |
| 1432 | |
| 1433 | for_each_sg(sg, sg, n, i) { |
| 1434 | orb->page_table[i].high = cpu_to_be32(sg_dma_len(sg) << 16); |
| 1435 | orb->page_table[i].low = cpu_to_be32(sg_dma_address(sg)); |
| 1436 | } |
| 1437 | |
| 1438 | orb->page_table_bus = |
| 1439 | dma_map_single(device->card->device, orb->page_table, |
| 1440 | sizeof(orb->page_table), DMA_TO_DEVICE); |
| 1441 | if (dma_mapping_error(device->card->device, orb->page_table_bus)) |
| 1442 | goto fail_page_table; |
| 1443 | |
| 1444 | /* |
| 1445 | * The data_descriptor pointer is the one case where we need |
| 1446 | * to fill in the node ID part of the address. All other |
| 1447 | * pointers assume that the data referenced reside on the |
| 1448 | * initiator (i.e. us), but data_descriptor can refer to data |
| 1449 | * on other nodes so we need to put our ID in descriptor.high. |
| 1450 | */ |
| 1451 | orb->request.data_descriptor.high = cpu_to_be32(lu->tgt->address_high); |
| 1452 | orb->request.data_descriptor.low = cpu_to_be32(orb->page_table_bus); |
| 1453 | orb->request.misc |= cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT | |
| 1454 | COMMAND_ORB_DATA_SIZE(n)); |
| 1455 | |
| 1456 | return 0; |
| 1457 | |
| 1458 | fail_page_table: |
| 1459 | dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd), |
| 1460 | scsi_sg_count(orb->cmd), orb->cmd->sc_data_direction); |
| 1461 | fail: |
| 1462 | return -ENOMEM; |
| 1463 | } |
| 1464 | |
| 1465 | /* SCSI stack integration */ |
| 1466 | |
| 1467 | static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done) |
| 1468 | { |
| 1469 | struct sbp2_logical_unit *lu = cmd->device->hostdata; |
| 1470 | struct fw_device *device = target_device(lu->tgt); |
| 1471 | struct sbp2_command_orb *orb; |
| 1472 | int generation, retval = SCSI_MLQUEUE_HOST_BUSY; |
| 1473 | |
| 1474 | /* |
| 1475 | * Bidirectional commands are not yet implemented, and unknown |
| 1476 | * transfer direction not handled. |
| 1477 | */ |
| 1478 | if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) { |
| 1479 | fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n"); |
| 1480 | cmd->result = DID_ERROR << 16; |
| 1481 | done(cmd); |
| 1482 | return 0; |
| 1483 | } |
| 1484 | |
| 1485 | orb = kzalloc(sizeof(*orb), GFP_ATOMIC); |
| 1486 | if (orb == NULL) { |
| 1487 | fw_notify("failed to alloc orb\n"); |
| 1488 | return SCSI_MLQUEUE_HOST_BUSY; |
| 1489 | } |
| 1490 | |
| 1491 | /* Initialize rcode to something not RCODE_COMPLETE. */ |
| 1492 | orb->base.rcode = -1; |
| 1493 | kref_init(&orb->base.kref); |
| 1494 | |
| 1495 | orb->lu = lu; |
| 1496 | orb->done = done; |
| 1497 | orb->cmd = cmd; |
| 1498 | |
| 1499 | orb->request.next.high = cpu_to_be32(SBP2_ORB_NULL); |
| 1500 | orb->request.misc = cpu_to_be32( |
| 1501 | COMMAND_ORB_MAX_PAYLOAD(lu->tgt->max_payload) | |
| 1502 | COMMAND_ORB_SPEED(device->max_speed) | |
| 1503 | COMMAND_ORB_NOTIFY); |
| 1504 | |
| 1505 | if (cmd->sc_data_direction == DMA_FROM_DEVICE) |
| 1506 | orb->request.misc |= cpu_to_be32(COMMAND_ORB_DIRECTION); |
| 1507 | |
| 1508 | generation = device->generation; |
| 1509 | smp_rmb(); /* sbp2_map_scatterlist looks at tgt->address_high */ |
| 1510 | |
| 1511 | if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0) |
| 1512 | goto out; |
| 1513 | |
| 1514 | memcpy(orb->request.command_block, cmd->cmnd, cmd->cmd_len); |
| 1515 | |
| 1516 | orb->base.callback = complete_command_orb; |
| 1517 | orb->base.request_bus = |
| 1518 | dma_map_single(device->card->device, &orb->request, |
| 1519 | sizeof(orb->request), DMA_TO_DEVICE); |
| 1520 | if (dma_mapping_error(device->card->device, orb->base.request_bus)) { |
| 1521 | sbp2_unmap_scatterlist(device->card->device, orb); |
| 1522 | goto out; |
| 1523 | } |
| 1524 | |
| 1525 | sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, generation, |
| 1526 | lu->command_block_agent_address + SBP2_ORB_POINTER); |
| 1527 | retval = 0; |
| 1528 | out: |
| 1529 | kref_put(&orb->base.kref, free_orb); |
| 1530 | return retval; |
| 1531 | } |
| 1532 | |
| 1533 | static int sbp2_scsi_slave_alloc(struct scsi_device *sdev) |
| 1534 | { |
| 1535 | struct sbp2_logical_unit *lu = sdev->hostdata; |
| 1536 | |
| 1537 | /* (Re-)Adding logical units via the SCSI stack is not supported. */ |
| 1538 | if (!lu) |
| 1539 | return -ENOSYS; |
| 1540 | |
| 1541 | sdev->allow_restart = 1; |
| 1542 | |
| 1543 | /* SBP-2 requires quadlet alignment of the data buffers. */ |
| 1544 | blk_queue_update_dma_alignment(sdev->request_queue, 4 - 1); |
| 1545 | |
| 1546 | if (lu->tgt->workarounds & SBP2_WORKAROUND_INQUIRY_36) |
| 1547 | sdev->inquiry_len = 36; |
| 1548 | |
| 1549 | return 0; |
| 1550 | } |
| 1551 | |
| 1552 | static int sbp2_scsi_slave_configure(struct scsi_device *sdev) |
| 1553 | { |
| 1554 | struct sbp2_logical_unit *lu = sdev->hostdata; |
| 1555 | |
| 1556 | sdev->use_10_for_rw = 1; |
| 1557 | |
| 1558 | if (sbp2_param_exclusive_login) |
| 1559 | sdev->manage_start_stop = 1; |
| 1560 | |
| 1561 | if (sdev->type == TYPE_ROM) |
| 1562 | sdev->use_10_for_ms = 1; |
| 1563 | |
| 1564 | if (sdev->type == TYPE_DISK && |
| 1565 | lu->tgt->workarounds & SBP2_WORKAROUND_MODE_SENSE_8) |
| 1566 | sdev->skip_ms_page_8 = 1; |
| 1567 | |
| 1568 | if (lu->tgt->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) |
| 1569 | sdev->fix_capacity = 1; |
| 1570 | |
| 1571 | if (lu->tgt->workarounds & SBP2_WORKAROUND_POWER_CONDITION) |
| 1572 | sdev->start_stop_pwr_cond = 1; |
| 1573 | |
| 1574 | if (lu->tgt->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS) |
| 1575 | blk_queue_max_hw_sectors(sdev->request_queue, 128 * 1024 / 512); |
| 1576 | |
| 1577 | blk_queue_max_segment_size(sdev->request_queue, SBP2_MAX_SEG_SIZE); |
| 1578 | |
| 1579 | return 0; |
| 1580 | } |
| 1581 | |
| 1582 | /* |
| 1583 | * Called by scsi stack when something has really gone wrong. Usually |
| 1584 | * called when a command has timed-out for some reason. |
| 1585 | */ |
| 1586 | static int sbp2_scsi_abort(struct scsi_cmnd *cmd) |
| 1587 | { |
| 1588 | struct sbp2_logical_unit *lu = cmd->device->hostdata; |
| 1589 | |
| 1590 | fw_notify("%s: sbp2_scsi_abort\n", lu->tgt->bus_id); |
| 1591 | sbp2_agent_reset(lu); |
| 1592 | sbp2_cancel_orbs(lu); |
| 1593 | |
| 1594 | return SUCCESS; |
| 1595 | } |
| 1596 | |
| 1597 | /* |
| 1598 | * Format of /sys/bus/scsi/devices/.../ieee1394_id: |
| 1599 | * u64 EUI-64 : u24 directory_ID : u16 LUN (all printed in hexadecimal) |
| 1600 | * |
| 1601 | * This is the concatenation of target port identifier and logical unit |
| 1602 | * identifier as per SAM-2...SAM-4 annex A. |
| 1603 | */ |
| 1604 | static ssize_t sbp2_sysfs_ieee1394_id_show(struct device *dev, |
| 1605 | struct device_attribute *attr, char *buf) |
| 1606 | { |
| 1607 | struct scsi_device *sdev = to_scsi_device(dev); |
| 1608 | struct sbp2_logical_unit *lu; |
| 1609 | |
| 1610 | if (!sdev) |
| 1611 | return 0; |
| 1612 | |
| 1613 | lu = sdev->hostdata; |
| 1614 | |
| 1615 | return sprintf(buf, "%016llx:%06x:%04x\n", |
| 1616 | (unsigned long long)lu->tgt->guid, |
| 1617 | lu->tgt->directory_id, lu->lun); |
| 1618 | } |
| 1619 | |
| 1620 | static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL); |
| 1621 | |
| 1622 | static struct device_attribute *sbp2_scsi_sysfs_attrs[] = { |
| 1623 | &dev_attr_ieee1394_id, |
| 1624 | NULL |
| 1625 | }; |
| 1626 | |
| 1627 | static struct scsi_host_template scsi_driver_template = { |
| 1628 | .module = THIS_MODULE, |
| 1629 | .name = "SBP-2 IEEE-1394", |
| 1630 | .proc_name = sbp2_driver_name, |
| 1631 | .queuecommand = sbp2_scsi_queuecommand, |
| 1632 | .slave_alloc = sbp2_scsi_slave_alloc, |
| 1633 | .slave_configure = sbp2_scsi_slave_configure, |
| 1634 | .eh_abort_handler = sbp2_scsi_abort, |
| 1635 | .this_id = -1, |
| 1636 | .sg_tablesize = SG_ALL, |
| 1637 | .use_clustering = ENABLE_CLUSTERING, |
| 1638 | .cmd_per_lun = 1, |
| 1639 | .can_queue = 1, |
| 1640 | .sdev_attrs = sbp2_scsi_sysfs_attrs, |
| 1641 | }; |
| 1642 | |
| 1643 | MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>"); |
| 1644 | MODULE_DESCRIPTION("SCSI over IEEE1394"); |
| 1645 | MODULE_LICENSE("GPL"); |
| 1646 | MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table); |
| 1647 | |
| 1648 | /* Provide a module alias so root-on-sbp2 initrds don't break. */ |
| 1649 | #ifndef CONFIG_IEEE1394_SBP2_MODULE |
| 1650 | MODULE_ALIAS("sbp2"); |
| 1651 | #endif |
| 1652 | |
| 1653 | static int __init sbp2_init(void) |
| 1654 | { |
| 1655 | sbp2_wq = create_singlethread_workqueue(KBUILD_MODNAME); |
| 1656 | if (!sbp2_wq) |
| 1657 | return -ENOMEM; |
| 1658 | |
| 1659 | return driver_register(&sbp2_driver.driver); |
| 1660 | } |
| 1661 | |
| 1662 | static void __exit sbp2_cleanup(void) |
| 1663 | { |
| 1664 | driver_unregister(&sbp2_driver.driver); |
| 1665 | destroy_workqueue(sbp2_wq); |
| 1666 | } |
| 1667 | |
| 1668 | module_init(sbp2_init); |
| 1669 | module_exit(sbp2_cleanup); |