Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Borislav Petkov | 5ce78af | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 2 | * IDE ATAPI streaming tape driver. |
| 3 | * |
Bartlomiej Zolnierkiewicz | 59bca8c | 2008-02-01 23:09:33 +0100 | [diff] [blame] | 4 | * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> |
| 5 | * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * This driver was constructed as a student project in the software laboratory |
| 8 | * of the faculty of electrical engineering in the Technion - Israel's |
| 9 | * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. |
| 10 | * |
| 11 | * It is hereby placed under the terms of the GNU general public license. |
| 12 | * (See linux/COPYING). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Borislav Petkov | 5ce78af | 2008-02-02 19:56:48 +0100 | [diff] [blame] | 14 | * For a historical changelog see |
| 15 | * Documentation/ide/ChangeLog.ide-tape.1995-2002 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | */ |
| 17 | |
| 18 | #define IDETAPE_VERSION "1.19" |
| 19 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/module.h> |
| 21 | #include <linux/types.h> |
| 22 | #include <linux/string.h> |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <linux/timer.h> |
| 26 | #include <linux/mm.h> |
| 27 | #include <linux/interrupt.h> |
Marcelo Feitoza Parisi | 9bae1ff | 2006-03-28 01:56:46 -0800 | [diff] [blame] | 28 | #include <linux/jiffies.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/major.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/errno.h> |
| 31 | #include <linux/genhd.h> |
| 32 | #include <linux/slab.h> |
| 33 | #include <linux/pci.h> |
| 34 | #include <linux/ide.h> |
| 35 | #include <linux/smp_lock.h> |
| 36 | #include <linux/completion.h> |
| 37 | #include <linux/bitops.h> |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 38 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | #include <asm/byteorder.h> |
| 41 | #include <asm/irq.h> |
| 42 | #include <asm/uaccess.h> |
| 43 | #include <asm/io.h> |
| 44 | #include <asm/unaligned.h> |
| 45 | |
| 46 | /* |
| 47 | * partition |
| 48 | */ |
| 49 | typedef struct os_partition_s { |
| 50 | __u8 partition_num; |
| 51 | __u8 par_desc_ver; |
| 52 | __u16 wrt_pass_cntr; |
| 53 | __u32 first_frame_addr; |
| 54 | __u32 last_frame_addr; |
| 55 | __u32 eod_frame_addr; |
| 56 | } os_partition_t; |
| 57 | |
| 58 | /* |
| 59 | * DAT entry |
| 60 | */ |
| 61 | typedef struct os_dat_entry_s { |
| 62 | __u32 blk_sz; |
| 63 | __u16 blk_cnt; |
| 64 | __u8 flags; |
| 65 | __u8 reserved; |
| 66 | } os_dat_entry_t; |
| 67 | |
| 68 | /* |
| 69 | * DAT |
| 70 | */ |
| 71 | #define OS_DAT_FLAGS_DATA (0xc) |
| 72 | #define OS_DAT_FLAGS_MARK (0x1) |
| 73 | |
| 74 | typedef struct os_dat_s { |
| 75 | __u8 dat_sz; |
| 76 | __u8 reserved1; |
| 77 | __u8 entry_cnt; |
| 78 | __u8 reserved3; |
| 79 | os_dat_entry_t dat_list[16]; |
| 80 | } os_dat_t; |
| 81 | |
| 82 | #include <linux/mtio.h> |
| 83 | |
| 84 | /**************************** Tunable parameters *****************************/ |
| 85 | |
| 86 | |
| 87 | /* |
| 88 | * Pipelined mode parameters. |
| 89 | * |
| 90 | * We try to use the minimum number of stages which is enough to |
| 91 | * keep the tape constantly streaming. To accomplish that, we implement |
| 92 | * a feedback loop around the maximum number of stages: |
| 93 | * |
| 94 | * We start from MIN maximum stages (we will not even use MIN stages |
| 95 | * if we don't need them), increment it by RATE*(MAX-MIN) |
| 96 | * whenever we sense that the pipeline is empty, until we reach |
| 97 | * the optimum value or until we reach MAX. |
| 98 | * |
| 99 | * Setting the following parameter to 0 is illegal: the pipelined mode |
| 100 | * cannot be disabled (calculate_speeds() divides by tape->max_stages.) |
| 101 | */ |
| 102 | #define IDETAPE_MIN_PIPELINE_STAGES 1 |
| 103 | #define IDETAPE_MAX_PIPELINE_STAGES 400 |
| 104 | #define IDETAPE_INCREASE_STAGES_RATE 20 |
| 105 | |
| 106 | /* |
| 107 | * The following are used to debug the driver: |
| 108 | * |
| 109 | * Setting IDETAPE_DEBUG_INFO to 1 will report device capabilities. |
| 110 | * Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control. |
| 111 | * Setting IDETAPE_DEBUG_BUGS to 1 will enable self-sanity checks in |
| 112 | * some places. |
| 113 | * |
| 114 | * Setting them to 0 will restore normal operation mode: |
| 115 | * |
| 116 | * 1. Disable logging normal successful operations. |
| 117 | * 2. Disable self-sanity checks. |
| 118 | * 3. Errors will still be logged, of course. |
| 119 | * |
| 120 | * All the #if DEBUG code will be removed some day, when the driver |
| 121 | * is verified to be stable enough. This will make it much more |
| 122 | * esthetic. |
| 123 | */ |
| 124 | #define IDETAPE_DEBUG_INFO 0 |
| 125 | #define IDETAPE_DEBUG_LOG 0 |
| 126 | #define IDETAPE_DEBUG_BUGS 1 |
| 127 | |
| 128 | /* |
| 129 | * After each failed packet command we issue a request sense command |
| 130 | * and retry the packet command IDETAPE_MAX_PC_RETRIES times. |
| 131 | * |
| 132 | * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. |
| 133 | */ |
| 134 | #define IDETAPE_MAX_PC_RETRIES 3 |
| 135 | |
| 136 | /* |
| 137 | * With each packet command, we allocate a buffer of |
| 138 | * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet |
| 139 | * commands (Not for READ/WRITE commands). |
| 140 | */ |
| 141 | #define IDETAPE_PC_BUFFER_SIZE 256 |
| 142 | |
| 143 | /* |
| 144 | * In various places in the driver, we need to allocate storage |
| 145 | * for packet commands and requests, which will remain valid while |
| 146 | * we leave the driver to wait for an interrupt or a timeout event. |
| 147 | */ |
| 148 | #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) |
| 149 | |
| 150 | /* |
| 151 | * Some drives (for example, Seagate STT3401A Travan) require a very long |
| 152 | * timeout, because they don't return an interrupt or clear their busy bit |
| 153 | * until after the command completes (even retension commands). |
| 154 | */ |
| 155 | #define IDETAPE_WAIT_CMD (900*HZ) |
| 156 | |
| 157 | /* |
| 158 | * The following parameter is used to select the point in the internal |
| 159 | * tape fifo in which we will start to refill the buffer. Decreasing |
| 160 | * the following parameter will improve the system's latency and |
Robert P. J. Day | 3a4fa0a | 2007-10-19 23:10:43 +0200 | [diff] [blame] | 161 | * interactive response, while using a high value might improve system |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | * throughput. |
| 163 | */ |
| 164 | #define IDETAPE_FIFO_THRESHOLD 2 |
| 165 | |
| 166 | /* |
| 167 | * DSC polling parameters. |
| 168 | * |
| 169 | * Polling for DSC (a single bit in the status register) is a very |
| 170 | * important function in ide-tape. There are two cases in which we |
| 171 | * poll for DSC: |
| 172 | * |
| 173 | * 1. Before a read/write packet command, to ensure that we |
| 174 | * can transfer data from/to the tape's data buffers, without |
| 175 | * causing an actual media access. In case the tape is not |
| 176 | * ready yet, we take out our request from the device |
| 177 | * request queue, so that ide.c will service requests from |
| 178 | * the other device on the same interface meanwhile. |
| 179 | * |
| 180 | * 2. After the successful initialization of a "media access |
| 181 | * packet command", which is a command which can take a long |
| 182 | * time to complete (it can be several seconds or even an hour). |
| 183 | * |
| 184 | * Again, we postpone our request in the middle to free the bus |
| 185 | * for the other device. The polling frequency here should be |
| 186 | * lower than the read/write frequency since those media access |
| 187 | * commands are slow. We start from a "fast" frequency - |
| 188 | * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC |
| 189 | * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a |
| 190 | * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute). |
| 191 | * |
| 192 | * We also set a timeout for the timer, in case something goes wrong. |
| 193 | * The timeout should be longer then the maximum execution time of a |
| 194 | * tape operation. |
| 195 | */ |
| 196 | |
| 197 | /* |
| 198 | * DSC timings. |
| 199 | */ |
| 200 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
| 201 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ |
| 202 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ |
| 203 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ |
| 204 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ |
| 205 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ |
| 206 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ |
| 207 | |
| 208 | /*************************** End of tunable parameters ***********************/ |
| 209 | |
| 210 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | * Read/Write error simulation |
| 212 | */ |
| 213 | #define SIMULATE_ERRORS 0 |
| 214 | |
| 215 | /* |
| 216 | * For general magnetic tape device compatibility. |
| 217 | */ |
| 218 | typedef enum { |
| 219 | idetape_direction_none, |
| 220 | idetape_direction_read, |
| 221 | idetape_direction_write |
| 222 | } idetape_chrdev_direction_t; |
| 223 | |
| 224 | struct idetape_bh { |
Stephen Rothwell | ab05796 | 2007-08-01 23:46:44 +0200 | [diff] [blame] | 225 | u32 b_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | atomic_t b_count; |
| 227 | struct idetape_bh *b_reqnext; |
| 228 | char *b_data; |
| 229 | }; |
| 230 | |
| 231 | /* |
| 232 | * Our view of a packet command. |
| 233 | */ |
| 234 | typedef struct idetape_packet_command_s { |
| 235 | u8 c[12]; /* Actual packet bytes */ |
| 236 | int retries; /* On each retry, we increment retries */ |
| 237 | int error; /* Error code */ |
| 238 | int request_transfer; /* Bytes to transfer */ |
| 239 | int actually_transferred; /* Bytes actually transferred */ |
| 240 | int buffer_size; /* Size of our data buffer */ |
| 241 | struct idetape_bh *bh; |
| 242 | char *b_data; |
| 243 | int b_count; |
| 244 | u8 *buffer; /* Data buffer */ |
| 245 | u8 *current_position; /* Pointer into the above buffer */ |
| 246 | ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */ |
| 247 | u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */ |
| 248 | unsigned long flags; /* Status/Action bit flags: long for set_bit */ |
| 249 | } idetape_pc_t; |
| 250 | |
| 251 | /* |
| 252 | * Packet command flag bits. |
| 253 | */ |
| 254 | /* Set when an error is considered normal - We won't retry */ |
| 255 | #define PC_ABORT 0 |
| 256 | /* 1 When polling for DSC on a media access command */ |
| 257 | #define PC_WAIT_FOR_DSC 1 |
| 258 | /* 1 when we prefer to use DMA if possible */ |
| 259 | #define PC_DMA_RECOMMENDED 2 |
| 260 | /* 1 while DMA in progress */ |
| 261 | #define PC_DMA_IN_PROGRESS 3 |
| 262 | /* 1 when encountered problem during DMA */ |
| 263 | #define PC_DMA_ERROR 4 |
| 264 | /* Data direction */ |
| 265 | #define PC_WRITING 5 |
| 266 | |
| 267 | /* |
| 268 | * Capabilities and Mechanical Status Page |
| 269 | */ |
| 270 | typedef struct { |
| 271 | unsigned page_code :6; /* Page code - Should be 0x2a */ |
| 272 | __u8 reserved0_6 :1; |
| 273 | __u8 ps :1; /* parameters saveable */ |
| 274 | __u8 page_length; /* Page Length - Should be 0x12 */ |
| 275 | __u8 reserved2, reserved3; |
| 276 | unsigned ro :1; /* Read Only Mode */ |
| 277 | unsigned reserved4_1234 :4; |
| 278 | unsigned sprev :1; /* Supports SPACE in the reverse direction */ |
| 279 | unsigned reserved4_67 :2; |
| 280 | unsigned reserved5_012 :3; |
| 281 | unsigned efmt :1; /* Supports ERASE command initiated formatting */ |
| 282 | unsigned reserved5_4 :1; |
| 283 | unsigned qfa :1; /* Supports the QFA two partition formats */ |
| 284 | unsigned reserved5_67 :2; |
| 285 | unsigned lock :1; /* Supports locking the volume */ |
| 286 | unsigned locked :1; /* The volume is locked */ |
| 287 | unsigned prevent :1; /* The device defaults in the prevent state after power up */ |
| 288 | unsigned eject :1; /* The device can eject the volume */ |
| 289 | __u8 disconnect :1; /* The device can break request > ctl */ |
| 290 | __u8 reserved6_5 :1; |
| 291 | unsigned ecc :1; /* Supports error correction */ |
| 292 | unsigned cmprs :1; /* Supports data compression */ |
| 293 | unsigned reserved7_0 :1; |
| 294 | unsigned blk512 :1; /* Supports 512 bytes block size */ |
| 295 | unsigned blk1024 :1; /* Supports 1024 bytes block size */ |
| 296 | unsigned reserved7_3_6 :4; |
| 297 | unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */ |
| 298 | /* transfers for slow buffer memory ??? */ |
| 299 | /* Also 32768 block size in some cases */ |
| 300 | __u16 max_speed; /* Maximum speed supported in KBps */ |
| 301 | __u8 reserved10, reserved11; |
| 302 | __u16 ctl; /* Continuous Transfer Limit in blocks */ |
| 303 | __u16 speed; /* Current Speed, in KBps */ |
| 304 | __u16 buffer_size; /* Buffer Size, in 512 bytes */ |
| 305 | __u8 reserved18, reserved19; |
| 306 | } idetape_capabilities_page_t; |
| 307 | |
| 308 | /* |
| 309 | * Block Size Page |
| 310 | */ |
| 311 | typedef struct { |
| 312 | unsigned page_code :6; /* Page code - Should be 0x30 */ |
| 313 | unsigned reserved1_6 :1; |
| 314 | unsigned ps :1; |
| 315 | __u8 page_length; /* Page Length - Should be 2 */ |
| 316 | __u8 reserved2; |
| 317 | unsigned play32 :1; |
| 318 | unsigned play32_5 :1; |
| 319 | unsigned reserved2_23 :2; |
| 320 | unsigned record32 :1; |
| 321 | unsigned record32_5 :1; |
| 322 | unsigned reserved2_6 :1; |
| 323 | unsigned one :1; |
| 324 | } idetape_block_size_page_t; |
| 325 | |
| 326 | /* |
| 327 | * A pipeline stage. |
| 328 | */ |
| 329 | typedef struct idetape_stage_s { |
| 330 | struct request rq; /* The corresponding request */ |
| 331 | struct idetape_bh *bh; /* The data buffers */ |
| 332 | struct idetape_stage_s *next; /* Pointer to the next stage */ |
| 333 | } idetape_stage_t; |
| 334 | |
| 335 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | * Most of our global data which we need to save even as we leave the |
| 337 | * driver due to an interrupt or a timer event is stored in a variable |
| 338 | * of type idetape_tape_t, defined below. |
| 339 | */ |
| 340 | typedef struct ide_tape_obj { |
| 341 | ide_drive_t *drive; |
| 342 | ide_driver_t *driver; |
| 343 | struct gendisk *disk; |
| 344 | struct kref kref; |
| 345 | |
| 346 | /* |
| 347 | * Since a typical character device operation requires more |
| 348 | * than one packet command, we provide here enough memory |
| 349 | * for the maximum of interconnected packet commands. |
| 350 | * The packet commands are stored in the circular array pc_stack. |
| 351 | * pc_stack_index points to the last used entry, and warps around |
| 352 | * to the start when we get to the last array entry. |
| 353 | * |
| 354 | * pc points to the current processed packet command. |
| 355 | * |
| 356 | * failed_pc points to the last failed packet command, or contains |
| 357 | * NULL if we do not need to retry any packet command. This is |
| 358 | * required since an additional packet command is needed before the |
| 359 | * retry, to get detailed information on what went wrong. |
| 360 | */ |
| 361 | /* Current packet command */ |
| 362 | idetape_pc_t *pc; |
| 363 | /* Last failed packet command */ |
| 364 | idetape_pc_t *failed_pc; |
| 365 | /* Packet command stack */ |
| 366 | idetape_pc_t pc_stack[IDETAPE_PC_STACK]; |
| 367 | /* Next free packet command storage space */ |
| 368 | int pc_stack_index; |
| 369 | struct request rq_stack[IDETAPE_PC_STACK]; |
| 370 | /* We implement a circular array */ |
| 371 | int rq_stack_index; |
| 372 | |
| 373 | /* |
| 374 | * DSC polling variables. |
| 375 | * |
| 376 | * While polling for DSC we use postponed_rq to postpone the |
| 377 | * current request so that ide.c will be able to service |
| 378 | * pending requests on the other device. Note that at most |
| 379 | * we will have only one DSC (usually data transfer) request |
| 380 | * in the device request queue. Additional requests can be |
| 381 | * queued in our internal pipeline, but they will be visible |
| 382 | * to ide.c only one at a time. |
| 383 | */ |
| 384 | struct request *postponed_rq; |
| 385 | /* The time in which we started polling for DSC */ |
| 386 | unsigned long dsc_polling_start; |
| 387 | /* Timer used to poll for dsc */ |
| 388 | struct timer_list dsc_timer; |
| 389 | /* Read/Write dsc polling frequency */ |
| 390 | unsigned long best_dsc_rw_frequency; |
| 391 | /* The current polling frequency */ |
| 392 | unsigned long dsc_polling_frequency; |
| 393 | /* Maximum waiting time */ |
| 394 | unsigned long dsc_timeout; |
| 395 | |
| 396 | /* |
| 397 | * Read position information |
| 398 | */ |
| 399 | u8 partition; |
| 400 | /* Current block */ |
| 401 | unsigned int first_frame_position; |
| 402 | unsigned int last_frame_position; |
| 403 | unsigned int blocks_in_buffer; |
| 404 | |
| 405 | /* |
| 406 | * Last error information |
| 407 | */ |
| 408 | u8 sense_key, asc, ascq; |
| 409 | |
| 410 | /* |
| 411 | * Character device operation |
| 412 | */ |
| 413 | unsigned int minor; |
| 414 | /* device name */ |
| 415 | char name[4]; |
| 416 | /* Current character device data transfer direction */ |
| 417 | idetape_chrdev_direction_t chrdev_direction; |
| 418 | |
| 419 | /* |
| 420 | * Device information |
| 421 | */ |
| 422 | /* Usually 512 or 1024 bytes */ |
| 423 | unsigned short tape_block_size; |
| 424 | int user_bs_factor; |
| 425 | /* Copy of the tape's Capabilities and Mechanical Page */ |
| 426 | idetape_capabilities_page_t capabilities; |
| 427 | |
| 428 | /* |
| 429 | * Active data transfer request parameters. |
| 430 | * |
| 431 | * At most, there is only one ide-tape originated data transfer |
| 432 | * request in the device request queue. This allows ide.c to |
| 433 | * easily service requests from the other device when we |
| 434 | * postpone our active request. In the pipelined operation |
| 435 | * mode, we use our internal pipeline structure to hold |
| 436 | * more data requests. |
| 437 | * |
| 438 | * The data buffer size is chosen based on the tape's |
| 439 | * recommendation. |
| 440 | */ |
| 441 | /* Pointer to the request which is waiting in the device request queue */ |
| 442 | struct request *active_data_request; |
| 443 | /* Data buffer size (chosen based on the tape's recommendation */ |
| 444 | int stage_size; |
| 445 | idetape_stage_t *merge_stage; |
| 446 | int merge_stage_size; |
| 447 | struct idetape_bh *bh; |
| 448 | char *b_data; |
| 449 | int b_count; |
| 450 | |
| 451 | /* |
| 452 | * Pipeline parameters. |
| 453 | * |
| 454 | * To accomplish non-pipelined mode, we simply set the following |
| 455 | * variables to zero (or NULL, where appropriate). |
| 456 | */ |
| 457 | /* Number of currently used stages */ |
| 458 | int nr_stages; |
| 459 | /* Number of pending stages */ |
| 460 | int nr_pending_stages; |
| 461 | /* We will not allocate more than this number of stages */ |
| 462 | int max_stages, min_pipeline, max_pipeline; |
| 463 | /* The first stage which will be removed from the pipeline */ |
| 464 | idetape_stage_t *first_stage; |
| 465 | /* The currently active stage */ |
| 466 | idetape_stage_t *active_stage; |
| 467 | /* Will be serviced after the currently active request */ |
| 468 | idetape_stage_t *next_stage; |
| 469 | /* New requests will be added to the pipeline here */ |
| 470 | idetape_stage_t *last_stage; |
| 471 | /* Optional free stage which we can use */ |
| 472 | idetape_stage_t *cache_stage; |
| 473 | int pages_per_stage; |
| 474 | /* Wasted space in each stage */ |
| 475 | int excess_bh_size; |
| 476 | |
| 477 | /* Status/Action flags: long for set_bit */ |
| 478 | unsigned long flags; |
| 479 | /* protects the ide-tape queue */ |
| 480 | spinlock_t spinlock; |
| 481 | |
| 482 | /* |
| 483 | * Measures average tape speed |
| 484 | */ |
| 485 | unsigned long avg_time; |
| 486 | int avg_size; |
| 487 | int avg_speed; |
| 488 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | char vendor_id[10]; |
| 490 | char product_id[18]; |
| 491 | char firmware_revision[6]; |
| 492 | int firmware_revision_num; |
| 493 | |
| 494 | /* the door is currently locked */ |
| 495 | int door_locked; |
| 496 | /* the tape hardware is write protected */ |
| 497 | char drv_write_prot; |
| 498 | /* the tape is write protected (hardware or opened as read-only) */ |
| 499 | char write_prot; |
| 500 | |
| 501 | /* |
| 502 | * Limit the number of times a request can |
| 503 | * be postponed, to avoid an infinite postpone |
| 504 | * deadlock. |
| 505 | */ |
| 506 | /* request postpone count limit */ |
| 507 | int postpone_cnt; |
| 508 | |
| 509 | /* |
| 510 | * Measures number of frames: |
| 511 | * |
| 512 | * 1. written/read to/from the driver pipeline (pipeline_head). |
| 513 | * 2. written/read to/from the tape buffers (idetape_bh). |
| 514 | * 3. written/read by the tape to/from the media (tape_head). |
| 515 | */ |
| 516 | int pipeline_head; |
| 517 | int buffer_head; |
| 518 | int tape_head; |
| 519 | int last_tape_head; |
| 520 | |
| 521 | /* |
| 522 | * Speed control at the tape buffers input/output |
| 523 | */ |
| 524 | unsigned long insert_time; |
| 525 | int insert_size; |
| 526 | int insert_speed; |
| 527 | int max_insert_speed; |
| 528 | int measure_insert_time; |
| 529 | |
| 530 | /* |
| 531 | * Measure tape still time, in milliseconds |
| 532 | */ |
| 533 | unsigned long tape_still_time_begin; |
| 534 | int tape_still_time; |
| 535 | |
| 536 | /* |
| 537 | * Speed regulation negative feedback loop |
| 538 | */ |
| 539 | int speed_control; |
| 540 | int pipeline_head_speed; |
| 541 | int controlled_pipeline_head_speed; |
| 542 | int uncontrolled_pipeline_head_speed; |
| 543 | int controlled_last_pipeline_head; |
| 544 | int uncontrolled_last_pipeline_head; |
| 545 | unsigned long uncontrolled_pipeline_head_time; |
| 546 | unsigned long controlled_pipeline_head_time; |
| 547 | int controlled_previous_pipeline_head; |
| 548 | int uncontrolled_previous_pipeline_head; |
| 549 | unsigned long controlled_previous_head_time; |
| 550 | unsigned long uncontrolled_previous_head_time; |
| 551 | int restart_speed_control_req; |
| 552 | |
| 553 | /* |
| 554 | * Debug_level determines amount of debugging output; |
| 555 | * can be changed using /proc/ide/hdx/settings |
| 556 | * 0 : almost no debugging output |
| 557 | * 1 : 0+output errors only |
| 558 | * 2 : 1+output all sensekey/asc |
| 559 | * 3 : 2+follow all chrdev related procedures |
| 560 | * 4 : 3+follow all procedures |
| 561 | * 5 : 4+include pc_stack rq_stack info |
| 562 | * 6 : 5+USE_COUNT updates |
| 563 | */ |
| 564 | int debug_level; |
| 565 | } idetape_tape_t; |
| 566 | |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 567 | static DEFINE_MUTEX(idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 569 | static struct class *idetape_sysfs_class; |
| 570 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) |
| 572 | |
| 573 | #define ide_tape_g(disk) \ |
| 574 | container_of((disk)->private_data, struct ide_tape_obj, driver) |
| 575 | |
| 576 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) |
| 577 | { |
| 578 | struct ide_tape_obj *tape = NULL; |
| 579 | |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 580 | mutex_lock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | tape = ide_tape_g(disk); |
| 582 | if (tape) |
| 583 | kref_get(&tape->kref); |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 584 | mutex_unlock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | return tape; |
| 586 | } |
| 587 | |
| 588 | static void ide_tape_release(struct kref *); |
| 589 | |
| 590 | static void ide_tape_put(struct ide_tape_obj *tape) |
| 591 | { |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 592 | mutex_lock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | kref_put(&tape->kref, ide_tape_release); |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 594 | mutex_unlock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | } |
| 596 | |
| 597 | /* |
| 598 | * Tape door status |
| 599 | */ |
| 600 | #define DOOR_UNLOCKED 0 |
| 601 | #define DOOR_LOCKED 1 |
| 602 | #define DOOR_EXPLICITLY_LOCKED 2 |
| 603 | |
| 604 | /* |
| 605 | * Tape flag bits values. |
| 606 | */ |
| 607 | #define IDETAPE_IGNORE_DSC 0 |
| 608 | #define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */ |
| 609 | #define IDETAPE_BUSY 2 /* Device already opened */ |
| 610 | #define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */ |
| 611 | #define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */ |
| 612 | #define IDETAPE_FILEMARK 5 /* Currently on a filemark */ |
| 613 | #define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */ |
| 614 | #define IDETAPE_READ_ERROR 7 |
| 615 | #define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */ |
| 616 | /* 0 = no tape is loaded, so we don't rewind after ejecting */ |
| 617 | #define IDETAPE_MEDIUM_PRESENT 9 |
| 618 | |
| 619 | /* |
| 620 | * Supported ATAPI tape drives packet commands |
| 621 | */ |
| 622 | #define IDETAPE_TEST_UNIT_READY_CMD 0x00 |
| 623 | #define IDETAPE_REWIND_CMD 0x01 |
| 624 | #define IDETAPE_REQUEST_SENSE_CMD 0x03 |
| 625 | #define IDETAPE_READ_CMD 0x08 |
| 626 | #define IDETAPE_WRITE_CMD 0x0a |
| 627 | #define IDETAPE_WRITE_FILEMARK_CMD 0x10 |
| 628 | #define IDETAPE_SPACE_CMD 0x11 |
| 629 | #define IDETAPE_INQUIRY_CMD 0x12 |
| 630 | #define IDETAPE_ERASE_CMD 0x19 |
| 631 | #define IDETAPE_MODE_SENSE_CMD 0x1a |
| 632 | #define IDETAPE_MODE_SELECT_CMD 0x15 |
| 633 | #define IDETAPE_LOAD_UNLOAD_CMD 0x1b |
| 634 | #define IDETAPE_PREVENT_CMD 0x1e |
| 635 | #define IDETAPE_LOCATE_CMD 0x2b |
| 636 | #define IDETAPE_READ_POSITION_CMD 0x34 |
| 637 | #define IDETAPE_READ_BUFFER_CMD 0x3c |
| 638 | #define IDETAPE_SET_SPEED_CMD 0xbb |
| 639 | |
| 640 | /* |
| 641 | * Some defines for the READ BUFFER command |
| 642 | */ |
| 643 | #define IDETAPE_RETRIEVE_FAULTY_BLOCK 6 |
| 644 | |
| 645 | /* |
| 646 | * Some defines for the SPACE command |
| 647 | */ |
| 648 | #define IDETAPE_SPACE_OVER_FILEMARK 1 |
| 649 | #define IDETAPE_SPACE_TO_EOD 3 |
| 650 | |
| 651 | /* |
| 652 | * Some defines for the LOAD UNLOAD command |
| 653 | */ |
| 654 | #define IDETAPE_LU_LOAD_MASK 1 |
| 655 | #define IDETAPE_LU_RETENSION_MASK 2 |
| 656 | #define IDETAPE_LU_EOT_MASK 4 |
| 657 | |
| 658 | /* |
| 659 | * Special requests for our block device strategy routine. |
| 660 | * |
| 661 | * In order to service a character device command, we add special |
| 662 | * requests to the tail of our block device request queue and wait |
| 663 | * for their completion. |
| 664 | */ |
| 665 | |
| 666 | enum { |
| 667 | REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ |
| 668 | REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ |
| 669 | REQ_IDETAPE_READ = (1 << 2), |
| 670 | REQ_IDETAPE_WRITE = (1 << 3), |
| 671 | REQ_IDETAPE_READ_BUFFER = (1 << 4), |
| 672 | }; |
| 673 | |
| 674 | /* |
| 675 | * Error codes which are returned in rq->errors to the higher part |
| 676 | * of the driver. |
| 677 | */ |
| 678 | #define IDETAPE_ERROR_GENERAL 101 |
| 679 | #define IDETAPE_ERROR_FILEMARK 102 |
| 680 | #define IDETAPE_ERROR_EOD 103 |
| 681 | |
| 682 | /* |
| 683 | * The following is used to format the general configuration word of |
| 684 | * the ATAPI IDENTIFY DEVICE command. |
| 685 | */ |
| 686 | struct idetape_id_gcw { |
| 687 | unsigned packet_size :2; /* Packet Size */ |
| 688 | unsigned reserved234 :3; /* Reserved */ |
| 689 | unsigned drq_type :2; /* Command packet DRQ type */ |
| 690 | unsigned removable :1; /* Removable media */ |
| 691 | unsigned device_type :5; /* Device type */ |
| 692 | unsigned reserved13 :1; /* Reserved */ |
| 693 | unsigned protocol :2; /* Protocol type */ |
| 694 | }; |
| 695 | |
| 696 | /* |
| 697 | * INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C) |
| 698 | */ |
| 699 | typedef struct { |
| 700 | unsigned device_type :5; /* Peripheral Device Type */ |
| 701 | unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */ |
| 702 | unsigned reserved1_6t0 :7; /* Reserved */ |
| 703 | unsigned rmb :1; /* Removable Medium Bit */ |
| 704 | unsigned ansi_version :3; /* ANSI Version */ |
| 705 | unsigned ecma_version :3; /* ECMA Version */ |
| 706 | unsigned iso_version :2; /* ISO Version */ |
| 707 | unsigned response_format :4; /* Response Data Format */ |
| 708 | unsigned reserved3_45 :2; /* Reserved */ |
| 709 | unsigned reserved3_6 :1; /* TrmIOP - Reserved */ |
| 710 | unsigned reserved3_7 :1; /* AENC - Reserved */ |
| 711 | __u8 additional_length; /* Additional Length (total_length-4) */ |
| 712 | __u8 rsv5, rsv6, rsv7; /* Reserved */ |
| 713 | __u8 vendor_id[8]; /* Vendor Identification */ |
| 714 | __u8 product_id[16]; /* Product Identification */ |
| 715 | __u8 revision_level[4]; /* Revision Level */ |
| 716 | __u8 vendor_specific[20]; /* Vendor Specific - Optional */ |
| 717 | __u8 reserved56t95[40]; /* Reserved - Optional */ |
| 718 | /* Additional information may be returned */ |
| 719 | } idetape_inquiry_result_t; |
| 720 | |
| 721 | /* |
| 722 | * READ POSITION packet command - Data Format (From Table 6-57) |
| 723 | */ |
| 724 | typedef struct { |
| 725 | unsigned reserved0_10 :2; /* Reserved */ |
| 726 | unsigned bpu :1; /* Block Position Unknown */ |
| 727 | unsigned reserved0_543 :3; /* Reserved */ |
| 728 | unsigned eop :1; /* End Of Partition */ |
| 729 | unsigned bop :1; /* Beginning Of Partition */ |
| 730 | u8 partition; /* Partition Number */ |
| 731 | u8 reserved2, reserved3; /* Reserved */ |
| 732 | u32 first_block; /* First Block Location */ |
| 733 | u32 last_block; /* Last Block Location (Optional) */ |
| 734 | u8 reserved12; /* Reserved */ |
| 735 | u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */ |
| 736 | u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */ |
| 737 | } idetape_read_position_result_t; |
| 738 | |
| 739 | /* |
| 740 | * Follows structures which are related to the SELECT SENSE / MODE SENSE |
| 741 | * packet commands. Those packet commands are still not supported |
| 742 | * by ide-tape. |
| 743 | */ |
| 744 | #define IDETAPE_BLOCK_DESCRIPTOR 0 |
| 745 | #define IDETAPE_CAPABILITIES_PAGE 0x2a |
| 746 | #define IDETAPE_PARAMTR_PAGE 0x2b /* Onstream DI-x0 only */ |
| 747 | #define IDETAPE_BLOCK_SIZE_PAGE 0x30 |
| 748 | #define IDETAPE_BUFFER_FILLING_PAGE 0x33 |
| 749 | |
| 750 | /* |
| 751 | * Mode Parameter Header for the MODE SENSE packet command |
| 752 | */ |
| 753 | typedef struct { |
| 754 | __u8 mode_data_length; /* Length of the following data transfer */ |
| 755 | __u8 medium_type; /* Medium Type */ |
| 756 | __u8 dsp; /* Device Specific Parameter */ |
| 757 | __u8 bdl; /* Block Descriptor Length */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | } idetape_mode_parameter_header_t; |
| 759 | |
| 760 | /* |
| 761 | * Mode Parameter Block Descriptor the MODE SENSE packet command |
| 762 | * |
| 763 | * Support for block descriptors is optional. |
| 764 | */ |
| 765 | typedef struct { |
| 766 | __u8 density_code; /* Medium density code */ |
| 767 | __u8 blocks[3]; /* Number of blocks */ |
| 768 | __u8 reserved4; /* Reserved */ |
| 769 | __u8 length[3]; /* Block Length */ |
| 770 | } idetape_parameter_block_descriptor_t; |
| 771 | |
| 772 | /* |
| 773 | * The Data Compression Page, as returned by the MODE SENSE packet command. |
| 774 | */ |
| 775 | typedef struct { |
| 776 | unsigned page_code :6; /* Page Code - Should be 0xf */ |
| 777 | unsigned reserved0 :1; /* Reserved */ |
| 778 | unsigned ps :1; |
| 779 | __u8 page_length; /* Page Length - Should be 14 */ |
| 780 | unsigned reserved2 :6; /* Reserved */ |
| 781 | unsigned dcc :1; /* Data Compression Capable */ |
| 782 | unsigned dce :1; /* Data Compression Enable */ |
| 783 | unsigned reserved3 :5; /* Reserved */ |
| 784 | unsigned red :2; /* Report Exception on Decompression */ |
| 785 | unsigned dde :1; /* Data Decompression Enable */ |
| 786 | __u32 ca; /* Compression Algorithm */ |
| 787 | __u32 da; /* Decompression Algorithm */ |
| 788 | __u8 reserved[4]; /* Reserved */ |
| 789 | } idetape_data_compression_page_t; |
| 790 | |
| 791 | /* |
| 792 | * The Medium Partition Page, as returned by the MODE SENSE packet command. |
| 793 | */ |
| 794 | typedef struct { |
| 795 | unsigned page_code :6; /* Page Code - Should be 0x11 */ |
| 796 | unsigned reserved1_6 :1; /* Reserved */ |
| 797 | unsigned ps :1; |
| 798 | __u8 page_length; /* Page Length - Should be 6 */ |
| 799 | __u8 map; /* Maximum Additional Partitions - Should be 0 */ |
| 800 | __u8 apd; /* Additional Partitions Defined - Should be 0 */ |
| 801 | unsigned reserved4_012 :3; /* Reserved */ |
| 802 | unsigned psum :2; /* Should be 0 */ |
| 803 | unsigned idp :1; /* Should be 0 */ |
| 804 | unsigned sdp :1; /* Should be 0 */ |
| 805 | unsigned fdp :1; /* Fixed Data Partitions */ |
| 806 | __u8 mfr; /* Medium Format Recognition */ |
| 807 | __u8 reserved[2]; /* Reserved */ |
| 808 | } idetape_medium_partition_page_t; |
| 809 | |
| 810 | /* |
| 811 | * Run time configurable parameters. |
| 812 | */ |
| 813 | typedef struct { |
| 814 | int dsc_rw_frequency; |
| 815 | int dsc_media_access_frequency; |
| 816 | int nr_stages; |
| 817 | } idetape_config_t; |
| 818 | |
| 819 | /* |
| 820 | * The variables below are used for the character device interface. |
| 821 | * Additional state variables are defined in our ide_drive_t structure. |
| 822 | */ |
| 823 | static struct ide_tape_obj * idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
| 824 | |
| 825 | #define ide_tape_f(file) ((file)->private_data) |
| 826 | |
| 827 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) |
| 828 | { |
| 829 | struct ide_tape_obj *tape = NULL; |
| 830 | |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 831 | mutex_lock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | tape = idetape_devs[i]; |
| 833 | if (tape) |
| 834 | kref_get(&tape->kref); |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 835 | mutex_unlock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | return tape; |
| 837 | } |
| 838 | |
| 839 | /* |
| 840 | * Function declarations |
| 841 | * |
| 842 | */ |
| 843 | static int idetape_chrdev_release (struct inode *inode, struct file *filp); |
| 844 | static void idetape_write_release (ide_drive_t *drive, unsigned int minor); |
| 845 | |
| 846 | /* |
| 847 | * Too bad. The drive wants to send us data which we are not ready to accept. |
| 848 | * Just throw it away. |
| 849 | */ |
| 850 | static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount) |
| 851 | { |
| 852 | while (bcount--) |
| 853 | (void) HWIF(drive)->INB(IDE_DATA_REG); |
| 854 | } |
| 855 | |
| 856 | static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) |
| 857 | { |
| 858 | struct idetape_bh *bh = pc->bh; |
| 859 | int count; |
| 860 | |
| 861 | while (bcount) { |
| 862 | #if IDETAPE_DEBUG_BUGS |
| 863 | if (bh == NULL) { |
| 864 | printk(KERN_ERR "ide-tape: bh == NULL in " |
| 865 | "idetape_input_buffers\n"); |
| 866 | idetape_discard_data(drive, bcount); |
| 867 | return; |
| 868 | } |
| 869 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 870 | count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount); |
| 871 | HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count); |
| 872 | bcount -= count; |
| 873 | atomic_add(count, &bh->b_count); |
| 874 | if (atomic_read(&bh->b_count) == bh->b_size) { |
| 875 | bh = bh->b_reqnext; |
| 876 | if (bh) |
| 877 | atomic_set(&bh->b_count, 0); |
| 878 | } |
| 879 | } |
| 880 | pc->bh = bh; |
| 881 | } |
| 882 | |
| 883 | static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) |
| 884 | { |
| 885 | struct idetape_bh *bh = pc->bh; |
| 886 | int count; |
| 887 | |
| 888 | while (bcount) { |
| 889 | #if IDETAPE_DEBUG_BUGS |
| 890 | if (bh == NULL) { |
| 891 | printk(KERN_ERR "ide-tape: bh == NULL in " |
| 892 | "idetape_output_buffers\n"); |
| 893 | return; |
| 894 | } |
| 895 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 896 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
| 897 | HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count); |
| 898 | bcount -= count; |
| 899 | pc->b_data += count; |
| 900 | pc->b_count -= count; |
| 901 | if (!pc->b_count) { |
| 902 | pc->bh = bh = bh->b_reqnext; |
| 903 | if (bh) { |
| 904 | pc->b_data = bh->b_data; |
| 905 | pc->b_count = atomic_read(&bh->b_count); |
| 906 | } |
| 907 | } |
| 908 | } |
| 909 | } |
| 910 | |
| 911 | static void idetape_update_buffers (idetape_pc_t *pc) |
| 912 | { |
| 913 | struct idetape_bh *bh = pc->bh; |
| 914 | int count; |
| 915 | unsigned int bcount = pc->actually_transferred; |
| 916 | |
| 917 | if (test_bit(PC_WRITING, &pc->flags)) |
| 918 | return; |
| 919 | while (bcount) { |
| 920 | #if IDETAPE_DEBUG_BUGS |
| 921 | if (bh == NULL) { |
| 922 | printk(KERN_ERR "ide-tape: bh == NULL in " |
| 923 | "idetape_update_buffers\n"); |
| 924 | return; |
| 925 | } |
| 926 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 927 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
| 928 | atomic_set(&bh->b_count, count); |
| 929 | if (atomic_read(&bh->b_count) == bh->b_size) |
| 930 | bh = bh->b_reqnext; |
| 931 | bcount -= count; |
| 932 | } |
| 933 | pc->bh = bh; |
| 934 | } |
| 935 | |
| 936 | /* |
| 937 | * idetape_next_pc_storage returns a pointer to a place in which we can |
| 938 | * safely store a packet command, even though we intend to leave the |
| 939 | * driver. A storage space for a maximum of IDETAPE_PC_STACK packet |
| 940 | * commands is allocated at initialization time. |
| 941 | */ |
| 942 | static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive) |
| 943 | { |
| 944 | idetape_tape_t *tape = drive->driver_data; |
| 945 | |
| 946 | #if IDETAPE_DEBUG_LOG |
| 947 | if (tape->debug_level >= 5) |
| 948 | printk(KERN_INFO "ide-tape: pc_stack_index=%d\n", |
| 949 | tape->pc_stack_index); |
| 950 | #endif /* IDETAPE_DEBUG_LOG */ |
| 951 | if (tape->pc_stack_index == IDETAPE_PC_STACK) |
| 952 | tape->pc_stack_index=0; |
| 953 | return (&tape->pc_stack[tape->pc_stack_index++]); |
| 954 | } |
| 955 | |
| 956 | /* |
| 957 | * idetape_next_rq_storage is used along with idetape_next_pc_storage. |
| 958 | * Since we queue packet commands in the request queue, we need to |
| 959 | * allocate a request, along with the allocation of a packet command. |
| 960 | */ |
| 961 | |
| 962 | /************************************************************** |
| 963 | * * |
| 964 | * This should get fixed to use kmalloc(.., GFP_ATOMIC) * |
| 965 | * followed later on by kfree(). -ml * |
| 966 | * * |
| 967 | **************************************************************/ |
| 968 | |
| 969 | static struct request *idetape_next_rq_storage (ide_drive_t *drive) |
| 970 | { |
| 971 | idetape_tape_t *tape = drive->driver_data; |
| 972 | |
| 973 | #if IDETAPE_DEBUG_LOG |
| 974 | if (tape->debug_level >= 5) |
| 975 | printk(KERN_INFO "ide-tape: rq_stack_index=%d\n", |
| 976 | tape->rq_stack_index); |
| 977 | #endif /* IDETAPE_DEBUG_LOG */ |
| 978 | if (tape->rq_stack_index == IDETAPE_PC_STACK) |
| 979 | tape->rq_stack_index=0; |
| 980 | return (&tape->rq_stack[tape->rq_stack_index++]); |
| 981 | } |
| 982 | |
| 983 | /* |
| 984 | * idetape_init_pc initializes a packet command. |
| 985 | */ |
| 986 | static void idetape_init_pc (idetape_pc_t *pc) |
| 987 | { |
| 988 | memset(pc->c, 0, 12); |
| 989 | pc->retries = 0; |
| 990 | pc->flags = 0; |
| 991 | pc->request_transfer = 0; |
| 992 | pc->buffer = pc->pc_buffer; |
| 993 | pc->buffer_size = IDETAPE_PC_BUFFER_SIZE; |
| 994 | pc->bh = NULL; |
| 995 | pc->b_data = NULL; |
| 996 | } |
| 997 | |
| 998 | /* |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame^] | 999 | * called on each failed packet command retry to analyze the request sense. We |
| 1000 | * currently do not utilize this information. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | */ |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame^] | 1002 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | { |
| 1004 | idetape_tape_t *tape = drive->driver_data; |
| 1005 | idetape_pc_t *pc = tape->failed_pc; |
| 1006 | |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame^] | 1007 | tape->sense_key = sense[2] & 0xF; |
| 1008 | tape->asc = sense[12]; |
| 1009 | tape->ascq = sense[13]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | #if IDETAPE_DEBUG_LOG |
| 1011 | /* |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame^] | 1012 | * Without debugging, we only log an error if we decided to give up |
| 1013 | * retrying. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | */ |
| 1015 | if (tape->debug_level >= 1) |
| 1016 | printk(KERN_INFO "ide-tape: pc = %x, sense key = %x, " |
| 1017 | "asc = %x, ascq = %x\n", |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame^] | 1018 | pc->c[0], tape->sense_key, |
| 1019 | tape->asc, tape->ascq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | #endif /* IDETAPE_DEBUG_LOG */ |
| 1021 | |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame^] | 1022 | /* Correct pc->actually_transferred by asking the tape. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | if (test_bit(PC_DMA_ERROR, &pc->flags)) { |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame^] | 1024 | pc->actually_transferred = pc->request_transfer - |
| 1025 | tape->tape_block_size * |
| 1026 | ntohl(get_unaligned((u32 *)&sense[3])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | idetape_update_buffers(pc); |
| 1028 | } |
| 1029 | |
| 1030 | /* |
| 1031 | * If error was the result of a zero-length read or write command, |
| 1032 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives |
| 1033 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. |
| 1034 | */ |
| 1035 | if ((pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame^] | 1036 | /* length == 0 */ |
| 1037 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { |
| 1038 | if (tape->sense_key == 5) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | /* don't report an error, everything's ok */ |
| 1040 | pc->error = 0; |
| 1041 | /* don't retry read/write */ |
| 1042 | set_bit(PC_ABORT, &pc->flags); |
| 1043 | } |
| 1044 | } |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame^] | 1045 | if (pc->c[0] == IDETAPE_READ_CMD && (sense[2] & 0x80)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | pc->error = IDETAPE_ERROR_FILEMARK; |
| 1047 | set_bit(PC_ABORT, &pc->flags); |
| 1048 | } |
| 1049 | if (pc->c[0] == IDETAPE_WRITE_CMD) { |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame^] | 1050 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
| 1051 | && tape->asc == 0x0 && tape->ascq == 0x2)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | pc->error = IDETAPE_ERROR_EOD; |
| 1053 | set_bit(PC_ABORT, &pc->flags); |
| 1054 | } |
| 1055 | } |
| 1056 | if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) { |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame^] | 1057 | if (tape->sense_key == 8) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | pc->error = IDETAPE_ERROR_EOD; |
| 1059 | set_bit(PC_ABORT, &pc->flags); |
| 1060 | } |
| 1061 | if (!test_bit(PC_ABORT, &pc->flags) && |
| 1062 | pc->actually_transferred) |
| 1063 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
| 1064 | } |
| 1065 | } |
| 1066 | |
| 1067 | /* |
| 1068 | * idetape_active_next_stage will declare the next stage as "active". |
| 1069 | */ |
| 1070 | static void idetape_active_next_stage (ide_drive_t *drive) |
| 1071 | { |
| 1072 | idetape_tape_t *tape = drive->driver_data; |
| 1073 | idetape_stage_t *stage = tape->next_stage; |
| 1074 | struct request *rq = &stage->rq; |
| 1075 | |
| 1076 | #if IDETAPE_DEBUG_LOG |
| 1077 | if (tape->debug_level >= 4) |
| 1078 | printk(KERN_INFO "ide-tape: Reached idetape_active_next_stage\n"); |
| 1079 | #endif /* IDETAPE_DEBUG_LOG */ |
| 1080 | #if IDETAPE_DEBUG_BUGS |
| 1081 | if (stage == NULL) { |
| 1082 | printk(KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n"); |
| 1083 | return; |
| 1084 | } |
| 1085 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 1086 | |
| 1087 | rq->rq_disk = tape->disk; |
| 1088 | rq->buffer = NULL; |
| 1089 | rq->special = (void *)stage->bh; |
| 1090 | tape->active_data_request = rq; |
| 1091 | tape->active_stage = stage; |
| 1092 | tape->next_stage = stage->next; |
| 1093 | } |
| 1094 | |
| 1095 | /* |
| 1096 | * idetape_increase_max_pipeline_stages is a part of the feedback |
| 1097 | * loop which tries to find the optimum number of stages. In the |
| 1098 | * feedback loop, we are starting from a minimum maximum number of |
| 1099 | * stages, and if we sense that the pipeline is empty, we try to |
| 1100 | * increase it, until we reach the user compile time memory limit. |
| 1101 | */ |
| 1102 | static void idetape_increase_max_pipeline_stages (ide_drive_t *drive) |
| 1103 | { |
| 1104 | idetape_tape_t *tape = drive->driver_data; |
| 1105 | int increase = (tape->max_pipeline - tape->min_pipeline) / 10; |
| 1106 | |
| 1107 | #if IDETAPE_DEBUG_LOG |
| 1108 | if (tape->debug_level >= 4) |
| 1109 | printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n"); |
| 1110 | #endif /* IDETAPE_DEBUG_LOG */ |
| 1111 | |
| 1112 | tape->max_stages += max(increase, 1); |
| 1113 | tape->max_stages = max(tape->max_stages, tape->min_pipeline); |
| 1114 | tape->max_stages = min(tape->max_stages, tape->max_pipeline); |
| 1115 | } |
| 1116 | |
| 1117 | /* |
| 1118 | * idetape_kfree_stage calls kfree to completely free a stage, along with |
| 1119 | * its related buffers. |
| 1120 | */ |
| 1121 | static void __idetape_kfree_stage (idetape_stage_t *stage) |
| 1122 | { |
| 1123 | struct idetape_bh *prev_bh, *bh = stage->bh; |
| 1124 | int size; |
| 1125 | |
| 1126 | while (bh != NULL) { |
| 1127 | if (bh->b_data != NULL) { |
| 1128 | size = (int) bh->b_size; |
| 1129 | while (size > 0) { |
| 1130 | free_page((unsigned long) bh->b_data); |
| 1131 | size -= PAGE_SIZE; |
| 1132 | bh->b_data += PAGE_SIZE; |
| 1133 | } |
| 1134 | } |
| 1135 | prev_bh = bh; |
| 1136 | bh = bh->b_reqnext; |
| 1137 | kfree(prev_bh); |
| 1138 | } |
| 1139 | kfree(stage); |
| 1140 | } |
| 1141 | |
| 1142 | static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage) |
| 1143 | { |
| 1144 | __idetape_kfree_stage(stage); |
| 1145 | } |
| 1146 | |
| 1147 | /* |
| 1148 | * idetape_remove_stage_head removes tape->first_stage from the pipeline. |
| 1149 | * The caller should avoid race conditions. |
| 1150 | */ |
| 1151 | static void idetape_remove_stage_head (ide_drive_t *drive) |
| 1152 | { |
| 1153 | idetape_tape_t *tape = drive->driver_data; |
| 1154 | idetape_stage_t *stage; |
| 1155 | |
| 1156 | #if IDETAPE_DEBUG_LOG |
| 1157 | if (tape->debug_level >= 4) |
| 1158 | printk(KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n"); |
| 1159 | #endif /* IDETAPE_DEBUG_LOG */ |
| 1160 | #if IDETAPE_DEBUG_BUGS |
| 1161 | if (tape->first_stage == NULL) { |
| 1162 | printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n"); |
| 1163 | return; |
| 1164 | } |
| 1165 | if (tape->active_stage == tape->first_stage) { |
| 1166 | printk(KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n"); |
| 1167 | return; |
| 1168 | } |
| 1169 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 1170 | stage = tape->first_stage; |
| 1171 | tape->first_stage = stage->next; |
| 1172 | idetape_kfree_stage(tape, stage); |
| 1173 | tape->nr_stages--; |
| 1174 | if (tape->first_stage == NULL) { |
| 1175 | tape->last_stage = NULL; |
| 1176 | #if IDETAPE_DEBUG_BUGS |
| 1177 | if (tape->next_stage != NULL) |
| 1178 | printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n"); |
| 1179 | if (tape->nr_stages) |
| 1180 | printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n"); |
| 1181 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 1182 | } |
| 1183 | } |
| 1184 | |
| 1185 | /* |
| 1186 | * This will free all the pipeline stages starting from new_last_stage->next |
| 1187 | * to the end of the list, and point tape->last_stage to new_last_stage. |
| 1188 | */ |
| 1189 | static void idetape_abort_pipeline(ide_drive_t *drive, |
| 1190 | idetape_stage_t *new_last_stage) |
| 1191 | { |
| 1192 | idetape_tape_t *tape = drive->driver_data; |
| 1193 | idetape_stage_t *stage = new_last_stage->next; |
| 1194 | idetape_stage_t *nstage; |
| 1195 | |
| 1196 | #if IDETAPE_DEBUG_LOG |
| 1197 | if (tape->debug_level >= 4) |
| 1198 | printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name); |
| 1199 | #endif |
| 1200 | while (stage) { |
| 1201 | nstage = stage->next; |
| 1202 | idetape_kfree_stage(tape, stage); |
| 1203 | --tape->nr_stages; |
| 1204 | --tape->nr_pending_stages; |
| 1205 | stage = nstage; |
| 1206 | } |
| 1207 | if (new_last_stage) |
| 1208 | new_last_stage->next = NULL; |
| 1209 | tape->last_stage = new_last_stage; |
| 1210 | tape->next_stage = NULL; |
| 1211 | } |
| 1212 | |
| 1213 | /* |
| 1214 | * idetape_end_request is used to finish servicing a request, and to |
| 1215 | * insert a pending pipeline request into the main device queue. |
| 1216 | */ |
| 1217 | static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) |
| 1218 | { |
| 1219 | struct request *rq = HWGROUP(drive)->rq; |
| 1220 | idetape_tape_t *tape = drive->driver_data; |
| 1221 | unsigned long flags; |
| 1222 | int error; |
| 1223 | int remove_stage = 0; |
| 1224 | idetape_stage_t *active_stage; |
| 1225 | |
| 1226 | #if IDETAPE_DEBUG_LOG |
| 1227 | if (tape->debug_level >= 4) |
| 1228 | printk(KERN_INFO "ide-tape: Reached idetape_end_request\n"); |
| 1229 | #endif /* IDETAPE_DEBUG_LOG */ |
| 1230 | |
| 1231 | switch (uptodate) { |
| 1232 | case 0: error = IDETAPE_ERROR_GENERAL; break; |
| 1233 | case 1: error = 0; break; |
| 1234 | default: error = uptodate; |
| 1235 | } |
| 1236 | rq->errors = error; |
| 1237 | if (error) |
| 1238 | tape->failed_pc = NULL; |
| 1239 | |
Bartlomiej Zolnierkiewicz | 3687221 | 2008-01-26 20:13:10 +0100 | [diff] [blame] | 1240 | if (!blk_special_request(rq)) { |
| 1241 | ide_end_request(drive, uptodate, nr_sects); |
| 1242 | return 0; |
| 1243 | } |
| 1244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | spin_lock_irqsave(&tape->spinlock, flags); |
| 1246 | |
| 1247 | /* The request was a pipelined data transfer request */ |
| 1248 | if (tape->active_data_request == rq) { |
| 1249 | active_stage = tape->active_stage; |
| 1250 | tape->active_stage = NULL; |
| 1251 | tape->active_data_request = NULL; |
| 1252 | tape->nr_pending_stages--; |
| 1253 | if (rq->cmd[0] & REQ_IDETAPE_WRITE) { |
| 1254 | remove_stage = 1; |
| 1255 | if (error) { |
| 1256 | set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); |
| 1257 | if (error == IDETAPE_ERROR_EOD) |
| 1258 | idetape_abort_pipeline(drive, active_stage); |
| 1259 | } |
| 1260 | } else if (rq->cmd[0] & REQ_IDETAPE_READ) { |
| 1261 | if (error == IDETAPE_ERROR_EOD) { |
| 1262 | set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); |
| 1263 | idetape_abort_pipeline(drive, active_stage); |
| 1264 | } |
| 1265 | } |
| 1266 | if (tape->next_stage != NULL) { |
| 1267 | idetape_active_next_stage(drive); |
| 1268 | |
| 1269 | /* |
| 1270 | * Insert the next request into the request queue. |
| 1271 | */ |
| 1272 | (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end); |
| 1273 | } else if (!error) { |
| 1274 | idetape_increase_max_pipeline_stages(drive); |
| 1275 | } |
| 1276 | } |
| 1277 | ide_end_drive_cmd(drive, 0, 0); |
| 1278 | // blkdev_dequeue_request(rq); |
| 1279 | // drive->rq = NULL; |
| 1280 | // end_that_request_last(rq); |
| 1281 | |
| 1282 | if (remove_stage) |
| 1283 | idetape_remove_stage_head(drive); |
| 1284 | if (tape->active_data_request == NULL) |
| 1285 | clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); |
| 1286 | spin_unlock_irqrestore(&tape->spinlock, flags); |
| 1287 | return 0; |
| 1288 | } |
| 1289 | |
| 1290 | static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive) |
| 1291 | { |
| 1292 | idetape_tape_t *tape = drive->driver_data; |
| 1293 | |
| 1294 | #if IDETAPE_DEBUG_LOG |
| 1295 | if (tape->debug_level >= 4) |
| 1296 | printk(KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n"); |
| 1297 | #endif /* IDETAPE_DEBUG_LOG */ |
| 1298 | if (!tape->pc->error) { |
Borislav Petkov | 1b5db43 | 2008-02-02 19:56:48 +0100 | [diff] [blame^] | 1299 | idetape_analyze_error(drive, tape->pc->buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | idetape_end_request(drive, 1, 0); |
| 1301 | } else { |
| 1302 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n"); |
| 1303 | idetape_end_request(drive, 0, 0); |
| 1304 | } |
| 1305 | return ide_stopped; |
| 1306 | } |
| 1307 | |
| 1308 | static void idetape_create_request_sense_cmd (idetape_pc_t *pc) |
| 1309 | { |
| 1310 | idetape_init_pc(pc); |
| 1311 | pc->c[0] = IDETAPE_REQUEST_SENSE_CMD; |
| 1312 | pc->c[4] = 20; |
| 1313 | pc->request_transfer = 20; |
| 1314 | pc->callback = &idetape_request_sense_callback; |
| 1315 | } |
| 1316 | |
| 1317 | static void idetape_init_rq(struct request *rq, u8 cmd) |
| 1318 | { |
| 1319 | memset(rq, 0, sizeof(*rq)); |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 1320 | rq->cmd_type = REQ_TYPE_SPECIAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | rq->cmd[0] = cmd; |
| 1322 | } |
| 1323 | |
| 1324 | /* |
| 1325 | * idetape_queue_pc_head generates a new packet command request in front |
| 1326 | * of the request queue, before the current request, so that it will be |
| 1327 | * processed immediately, on the next pass through the driver. |
| 1328 | * |
| 1329 | * idetape_queue_pc_head is called from the request handling part of |
| 1330 | * the driver (the "bottom" part). Safe storage for the request should |
| 1331 | * be allocated with idetape_next_pc_storage and idetape_next_rq_storage |
| 1332 | * before calling idetape_queue_pc_head. |
| 1333 | * |
| 1334 | * Memory for those requests is pre-allocated at initialization time, and |
| 1335 | * is limited to IDETAPE_PC_STACK requests. We assume that we have enough |
| 1336 | * space for the maximum possible number of inter-dependent packet commands. |
| 1337 | * |
| 1338 | * The higher level of the driver - The ioctl handler and the character |
| 1339 | * device handling functions should queue request to the lower level part |
| 1340 | * and wait for their completion using idetape_queue_pc_tail or |
| 1341 | * idetape_queue_rw_tail. |
| 1342 | */ |
| 1343 | static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq) |
| 1344 | { |
| 1345 | struct ide_tape_obj *tape = drive->driver_data; |
| 1346 | |
| 1347 | idetape_init_rq(rq, REQ_IDETAPE_PC1); |
| 1348 | rq->buffer = (char *) pc; |
| 1349 | rq->rq_disk = tape->disk; |
| 1350 | (void) ide_do_drive_cmd(drive, rq, ide_preempt); |
| 1351 | } |
| 1352 | |
| 1353 | /* |
| 1354 | * idetape_retry_pc is called when an error was detected during the |
| 1355 | * last packet command. We queue a request sense packet command in |
| 1356 | * the head of the request list. |
| 1357 | */ |
| 1358 | static ide_startstop_t idetape_retry_pc (ide_drive_t *drive) |
| 1359 | { |
| 1360 | idetape_tape_t *tape = drive->driver_data; |
| 1361 | idetape_pc_t *pc; |
| 1362 | struct request *rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | |
Bartlomiej Zolnierkiewicz | 0e38a66 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1364 | (void)drive->hwif->INB(IDE_ERROR_REG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | pc = idetape_next_pc_storage(drive); |
| 1366 | rq = idetape_next_rq_storage(drive); |
| 1367 | idetape_create_request_sense_cmd(pc); |
| 1368 | set_bit(IDETAPE_IGNORE_DSC, &tape->flags); |
| 1369 | idetape_queue_pc_head(drive, pc, rq); |
| 1370 | return ide_stopped; |
| 1371 | } |
| 1372 | |
| 1373 | /* |
| 1374 | * idetape_postpone_request postpones the current request so that |
| 1375 | * ide.c will be able to service requests from another device on |
| 1376 | * the same hwgroup while we are polling for DSC. |
| 1377 | */ |
| 1378 | static void idetape_postpone_request (ide_drive_t *drive) |
| 1379 | { |
| 1380 | idetape_tape_t *tape = drive->driver_data; |
| 1381 | |
| 1382 | #if IDETAPE_DEBUG_LOG |
| 1383 | if (tape->debug_level >= 4) |
| 1384 | printk(KERN_INFO "ide-tape: idetape_postpone_request\n"); |
| 1385 | #endif |
| 1386 | tape->postponed_rq = HWGROUP(drive)->rq; |
| 1387 | ide_stall_queue(drive, tape->dsc_polling_frequency); |
| 1388 | } |
| 1389 | |
| 1390 | /* |
| 1391 | * idetape_pc_intr is the usual interrupt handler which will be called |
| 1392 | * during a packet command. We will transfer some of the data (as |
| 1393 | * requested by the drive) and will re-point interrupt handler to us. |
| 1394 | * When data transfer is finished, we will act according to the |
| 1395 | * algorithm described before idetape_issue_packet_command. |
| 1396 | * |
| 1397 | */ |
| 1398 | static ide_startstop_t idetape_pc_intr (ide_drive_t *drive) |
| 1399 | { |
| 1400 | ide_hwif_t *hwif = drive->hwif; |
| 1401 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | idetape_pc_t *pc = tape->pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | unsigned int temp; |
| 1404 | #if SIMULATE_ERRORS |
| 1405 | static int error_sim_count = 0; |
| 1406 | #endif |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1407 | u16 bcount; |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1408 | u8 stat, ireason; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | |
| 1410 | #if IDETAPE_DEBUG_LOG |
| 1411 | if (tape->debug_level >= 4) |
| 1412 | printk(KERN_INFO "ide-tape: Reached idetape_pc_intr " |
| 1413 | "interrupt handler\n"); |
| 1414 | #endif /* IDETAPE_DEBUG_LOG */ |
| 1415 | |
| 1416 | /* Clear the interrupt */ |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1417 | stat = hwif->INB(IDE_STATUS_REG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | |
| 1419 | if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) { |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1420 | if (hwif->ide_dma_end(drive) || (stat & ERR_STAT)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | /* |
| 1422 | * A DMA error is sometimes expected. For example, |
| 1423 | * if the tape is crossing a filemark during a |
| 1424 | * READ command, it will issue an irq and position |
| 1425 | * itself before the filemark, so that only a partial |
| 1426 | * data transfer will occur (which causes the DMA |
| 1427 | * error). In that case, we will later ask the tape |
| 1428 | * how much bytes of the original request were |
| 1429 | * actually transferred (we can't receive that |
| 1430 | * information from the DMA engine on most chipsets). |
| 1431 | */ |
| 1432 | |
| 1433 | /* |
| 1434 | * On the contrary, a DMA error is never expected; |
| 1435 | * it usually indicates a hardware error or abort. |
| 1436 | * If the tape crosses a filemark during a READ |
| 1437 | * command, it will issue an irq and position itself |
| 1438 | * after the filemark (not before). Only a partial |
| 1439 | * data transfer will occur, but no DMA error. |
| 1440 | * (AS, 19 Apr 2001) |
| 1441 | */ |
| 1442 | set_bit(PC_DMA_ERROR, &pc->flags); |
| 1443 | } else { |
| 1444 | pc->actually_transferred = pc->request_transfer; |
| 1445 | idetape_update_buffers(pc); |
| 1446 | } |
| 1447 | #if IDETAPE_DEBUG_LOG |
| 1448 | if (tape->debug_level >= 4) |
| 1449 | printk(KERN_INFO "ide-tape: DMA finished\n"); |
| 1450 | #endif /* IDETAPE_DEBUG_LOG */ |
| 1451 | } |
| 1452 | |
| 1453 | /* No more interrupts */ |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1454 | if ((stat & DRQ_STAT) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | #if IDETAPE_DEBUG_LOG |
| 1456 | if (tape->debug_level >= 2) |
| 1457 | printk(KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred); |
| 1458 | #endif /* IDETAPE_DEBUG_LOG */ |
| 1459 | clear_bit(PC_DMA_IN_PROGRESS, &pc->flags); |
| 1460 | |
| 1461 | local_irq_enable(); |
| 1462 | |
| 1463 | #if SIMULATE_ERRORS |
| 1464 | if ((pc->c[0] == IDETAPE_WRITE_CMD || |
| 1465 | pc->c[0] == IDETAPE_READ_CMD) && |
| 1466 | (++error_sim_count % 100) == 0) { |
| 1467 | printk(KERN_INFO "ide-tape: %s: simulating error\n", |
| 1468 | tape->name); |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1469 | stat |= ERR_STAT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | } |
| 1471 | #endif |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1472 | if ((stat & ERR_STAT) && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) |
| 1473 | stat &= ~ERR_STAT; |
| 1474 | if ((stat & ERR_STAT) || test_bit(PC_DMA_ERROR, &pc->flags)) { |
| 1475 | /* Error detected */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | #if IDETAPE_DEBUG_LOG |
| 1477 | if (tape->debug_level >= 1) |
| 1478 | printk(KERN_INFO "ide-tape: %s: I/O error\n", |
| 1479 | tape->name); |
| 1480 | #endif /* IDETAPE_DEBUG_LOG */ |
| 1481 | if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { |
| 1482 | printk(KERN_ERR "ide-tape: I/O error in request sense command\n"); |
| 1483 | return ide_do_reset(drive); |
| 1484 | } |
| 1485 | #if IDETAPE_DEBUG_LOG |
| 1486 | if (tape->debug_level >= 1) |
| 1487 | printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]); |
| 1488 | #endif |
| 1489 | /* Retry operation */ |
| 1490 | return idetape_retry_pc(drive); |
| 1491 | } |
| 1492 | pc->error = 0; |
| 1493 | if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) && |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1494 | (stat & SEEK_STAT) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | /* Media access command */ |
| 1496 | tape->dsc_polling_start = jiffies; |
| 1497 | tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST; |
| 1498 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; |
| 1499 | /* Allow ide.c to handle other requests */ |
| 1500 | idetape_postpone_request(drive); |
| 1501 | return ide_stopped; |
| 1502 | } |
| 1503 | if (tape->failed_pc == pc) |
| 1504 | tape->failed_pc = NULL; |
| 1505 | /* Command finished - Call the callback function */ |
| 1506 | return pc->callback(drive); |
| 1507 | } |
| 1508 | if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) { |
| 1509 | printk(KERN_ERR "ide-tape: The tape wants to issue more " |
| 1510 | "interrupts in DMA mode\n"); |
| 1511 | printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n"); |
Bartlomiej Zolnierkiewicz | 7469aaf | 2007-02-17 02:40:26 +0100 | [diff] [blame] | 1512 | ide_dma_off(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1513 | return ide_do_reset(drive); |
| 1514 | } |
| 1515 | /* Get the number of bytes to transfer on this interrupt. */ |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1516 | bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) | |
| 1517 | hwif->INB(IDE_BCOUNTL_REG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1519 | ireason = hwif->INB(IDE_IREASON_REG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1521 | if (ireason & CD) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1522 | printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n"); |
| 1523 | return ide_do_reset(drive); |
| 1524 | } |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1525 | if (((ireason & IO) == IO) == test_bit(PC_WRITING, &pc->flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | /* Hopefully, we will never get here */ |
| 1527 | printk(KERN_ERR "ide-tape: We wanted to %s, ", |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1528 | (ireason & IO) ? "Write" : "Read"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1529 | printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n", |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1530 | (ireason & IO) ? "Read" : "Write"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | return ide_do_reset(drive); |
| 1532 | } |
| 1533 | if (!test_bit(PC_WRITING, &pc->flags)) { |
| 1534 | /* Reading - Check that we have enough space */ |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1535 | temp = pc->actually_transferred + bcount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | if (temp > pc->request_transfer) { |
| 1537 | if (temp > pc->buffer_size) { |
| 1538 | printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n"); |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1539 | idetape_discard_data(drive, bcount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); |
| 1541 | return ide_started; |
| 1542 | } |
| 1543 | #if IDETAPE_DEBUG_LOG |
| 1544 | if (tape->debug_level >= 2) |
| 1545 | printk(KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n"); |
| 1546 | #endif /* IDETAPE_DEBUG_LOG */ |
| 1547 | } |
| 1548 | } |
| 1549 | if (test_bit(PC_WRITING, &pc->flags)) { |
| 1550 | if (pc->bh != NULL) |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1551 | idetape_output_buffers(drive, pc, bcount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | else |
| 1553 | /* Write the current buffer */ |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1554 | hwif->atapi_output_bytes(drive, pc->current_position, |
| 1555 | bcount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | } else { |
| 1557 | if (pc->bh != NULL) |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1558 | idetape_input_buffers(drive, pc, bcount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | else |
| 1560 | /* Read the current buffer */ |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1561 | hwif->atapi_input_bytes(drive, pc->current_position, |
| 1562 | bcount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | } |
| 1564 | /* Update the current position */ |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1565 | pc->actually_transferred += bcount; |
| 1566 | pc->current_position += bcount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | #if IDETAPE_DEBUG_LOG |
| 1568 | if (tape->debug_level >= 2) |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1569 | printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes " |
| 1570 | "on that interrupt\n", pc->c[0], bcount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | #endif |
| 1572 | /* And set the interrupt handler again */ |
| 1573 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); |
| 1574 | return ide_started; |
| 1575 | } |
| 1576 | |
| 1577 | /* |
| 1578 | * Packet Command Interface |
| 1579 | * |
| 1580 | * The current Packet Command is available in tape->pc, and will not |
| 1581 | * change until we finish handling it. Each packet command is associated |
| 1582 | * with a callback function that will be called when the command is |
| 1583 | * finished. |
| 1584 | * |
| 1585 | * The handling will be done in three stages: |
| 1586 | * |
| 1587 | * 1. idetape_issue_packet_command will send the packet command to the |
| 1588 | * drive, and will set the interrupt handler to idetape_pc_intr. |
| 1589 | * |
| 1590 | * 2. On each interrupt, idetape_pc_intr will be called. This step |
| 1591 | * will be repeated until the device signals us that no more |
| 1592 | * interrupts will be issued. |
| 1593 | * |
| 1594 | * 3. ATAPI Tape media access commands have immediate status with a |
| 1595 | * delayed process. In case of a successful initiation of a |
| 1596 | * media access packet command, the DSC bit will be set when the |
| 1597 | * actual execution of the command is finished. |
| 1598 | * Since the tape drive will not issue an interrupt, we have to |
| 1599 | * poll for this event. In this case, we define the request as |
| 1600 | * "low priority request" by setting rq_status to |
| 1601 | * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit |
| 1602 | * the driver. |
| 1603 | * |
| 1604 | * ide.c will then give higher priority to requests which |
| 1605 | * originate from the other device, until will change rq_status |
| 1606 | * to RQ_ACTIVE. |
| 1607 | * |
| 1608 | * 4. When the packet command is finished, it will be checked for errors. |
| 1609 | * |
| 1610 | * 5. In case an error was found, we queue a request sense packet |
| 1611 | * command in front of the request queue and retry the operation |
| 1612 | * up to IDETAPE_MAX_PC_RETRIES times. |
| 1613 | * |
| 1614 | * 6. In case no error was found, or we decided to give up and not |
| 1615 | * to retry again, the callback function will be called and then |
| 1616 | * we will handle the next request. |
| 1617 | * |
| 1618 | */ |
| 1619 | static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) |
| 1620 | { |
| 1621 | ide_hwif_t *hwif = drive->hwif; |
| 1622 | idetape_tape_t *tape = drive->driver_data; |
| 1623 | idetape_pc_t *pc = tape->pc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | int retries = 100; |
| 1625 | ide_startstop_t startstop; |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1626 | u8 ireason; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | |
| 1628 | if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { |
| 1629 | printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n"); |
| 1630 | return startstop; |
| 1631 | } |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1632 | ireason = hwif->INB(IDE_IREASON_REG); |
| 1633 | while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing " |
| 1635 | "a packet command, retrying\n"); |
| 1636 | udelay(100); |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1637 | ireason = hwif->INB(IDE_IREASON_REG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | if (retries == 0) { |
| 1639 | printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while " |
| 1640 | "issuing a packet command, ignoring\n"); |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1641 | ireason |= CD; |
| 1642 | ireason &= ~IO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | } |
| 1644 | } |
Bartlomiej Zolnierkiewicz | 8e7657a | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1645 | if ((ireason & CD) == 0 || (ireason & IO)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing " |
| 1647 | "a packet command\n"); |
| 1648 | return ide_do_reset(drive); |
| 1649 | } |
| 1650 | /* Set the interrupt routine */ |
| 1651 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); |
| 1652 | #ifdef CONFIG_BLK_DEV_IDEDMA |
| 1653 | /* Begin DMA, if necessary */ |
| 1654 | if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) |
| 1655 | hwif->dma_start(drive); |
| 1656 | #endif |
| 1657 | /* Send the actual packet */ |
| 1658 | HWIF(drive)->atapi_output_bytes(drive, pc->c, 12); |
| 1659 | return ide_started; |
| 1660 | } |
| 1661 | |
| 1662 | static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc) |
| 1663 | { |
| 1664 | ide_hwif_t *hwif = drive->hwif; |
| 1665 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | int dma_ok = 0; |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1667 | u16 bcount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | |
| 1669 | #if IDETAPE_DEBUG_BUGS |
| 1670 | if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD && |
| 1671 | pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { |
| 1672 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " |
| 1673 | "Two request sense in serial were issued\n"); |
| 1674 | } |
| 1675 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 1676 | |
| 1677 | if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD) |
| 1678 | tape->failed_pc = pc; |
| 1679 | /* Set the current packet command */ |
| 1680 | tape->pc = pc; |
| 1681 | |
| 1682 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || |
| 1683 | test_bit(PC_ABORT, &pc->flags)) { |
| 1684 | /* |
| 1685 | * We will "abort" retrying a packet command in case |
| 1686 | * a legitimate error code was received (crossing a |
| 1687 | * filemark, or end of the media, for example). |
| 1688 | */ |
| 1689 | if (!test_bit(PC_ABORT, &pc->flags)) { |
| 1690 | if (!(pc->c[0] == IDETAPE_TEST_UNIT_READY_CMD && |
| 1691 | tape->sense_key == 2 && tape->asc == 4 && |
| 1692 | (tape->ascq == 1 || tape->ascq == 8))) { |
| 1693 | printk(KERN_ERR "ide-tape: %s: I/O error, " |
| 1694 | "pc = %2x, key = %2x, " |
| 1695 | "asc = %2x, ascq = %2x\n", |
| 1696 | tape->name, pc->c[0], |
| 1697 | tape->sense_key, tape->asc, |
| 1698 | tape->ascq); |
| 1699 | } |
| 1700 | /* Giving up */ |
| 1701 | pc->error = IDETAPE_ERROR_GENERAL; |
| 1702 | } |
| 1703 | tape->failed_pc = NULL; |
| 1704 | return pc->callback(drive); |
| 1705 | } |
| 1706 | #if IDETAPE_DEBUG_LOG |
| 1707 | if (tape->debug_level >= 2) |
| 1708 | printk(KERN_INFO "ide-tape: Retry number - %d, cmd = %02X\n", pc->retries, pc->c[0]); |
| 1709 | #endif /* IDETAPE_DEBUG_LOG */ |
| 1710 | |
| 1711 | pc->retries++; |
| 1712 | /* We haven't transferred any data yet */ |
| 1713 | pc->actually_transferred = 0; |
| 1714 | pc->current_position = pc->buffer; |
| 1715 | /* Request to transfer the entire buffer at once */ |
Bartlomiej Zolnierkiewicz | 790d123 | 2008-01-25 22:17:12 +0100 | [diff] [blame] | 1716 | bcount = pc->request_transfer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1717 | |
| 1718 | if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) { |
| 1719 | printk(KERN_WARNING "ide-tape: DMA disabled, " |
| 1720 | "reverting to PIO\n"); |
Bartlomiej Zolnierkiewicz | 7469aaf | 2007-02-17 02:40:26 +0100 | [diff] [blame] | 1721 | ide_dma_off(drive); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | } |
| 1723 | if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma) |
| 1724 | dma_ok = !hwif->dma_setup(drive); |
| 1725 | |
Bartlomiej Zolnierkiewicz | 2fc5738 | 2008-01-25 22:17:13 +0100 | [diff] [blame] | 1726 | ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK | |
| 1727 | IDE_TFLAG_OUT_DEVICE, bcount, dma_ok); |
| 1728 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | if (dma_ok) /* Will begin DMA later */ |
| 1730 | set_bit(PC_DMA_IN_PROGRESS, &pc->flags); |
| 1731 | if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) { |
Bartlomiej Zolnierkiewicz | c1c9dbc | 2008-02-02 19:56:44 +0100 | [diff] [blame] | 1732 | ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc, |
| 1733 | IDETAPE_WAIT_CMD, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | return ide_started; |
| 1735 | } else { |
| 1736 | hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); |
| 1737 | return idetape_transfer_pc(drive); |
| 1738 | } |
| 1739 | } |
| 1740 | |
| 1741 | /* |
| 1742 | * General packet command callback function. |
| 1743 | */ |
| 1744 | static ide_startstop_t idetape_pc_callback (ide_drive_t *drive) |
| 1745 | { |
| 1746 | idetape_tape_t *tape = drive->driver_data; |
| 1747 | |
| 1748 | #if IDETAPE_DEBUG_LOG |
| 1749 | if (tape->debug_level >= 4) |
| 1750 | printk(KERN_INFO "ide-tape: Reached idetape_pc_callback\n"); |
| 1751 | #endif /* IDETAPE_DEBUG_LOG */ |
| 1752 | |
| 1753 | idetape_end_request(drive, tape->pc->error ? 0 : 1, 0); |
| 1754 | return ide_stopped; |
| 1755 | } |
| 1756 | |
| 1757 | /* |
| 1758 | * A mode sense command is used to "sense" tape parameters. |
| 1759 | */ |
| 1760 | static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code) |
| 1761 | { |
| 1762 | idetape_init_pc(pc); |
| 1763 | pc->c[0] = IDETAPE_MODE_SENSE_CMD; |
| 1764 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
| 1765 | pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */ |
| 1766 | pc->c[2] = page_code; |
| 1767 | /* |
| 1768 | * Changed pc->c[3] to 0 (255 will at best return unused info). |
| 1769 | * |
| 1770 | * For SCSI this byte is defined as subpage instead of high byte |
| 1771 | * of length and some IDE drives seem to interpret it this way |
| 1772 | * and return an error when 255 is used. |
| 1773 | */ |
| 1774 | pc->c[3] = 0; |
| 1775 | pc->c[4] = 255; /* (We will just discard data in that case) */ |
| 1776 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
| 1777 | pc->request_transfer = 12; |
| 1778 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
| 1779 | pc->request_transfer = 24; |
| 1780 | else |
| 1781 | pc->request_transfer = 50; |
| 1782 | pc->callback = &idetape_pc_callback; |
| 1783 | } |
| 1784 | |
| 1785 | static void calculate_speeds(ide_drive_t *drive) |
| 1786 | { |
| 1787 | idetape_tape_t *tape = drive->driver_data; |
| 1788 | int full = 125, empty = 75; |
| 1789 | |
| 1790 | if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) { |
| 1791 | tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head; |
| 1792 | tape->controlled_previous_head_time = tape->controlled_pipeline_head_time; |
| 1793 | tape->controlled_last_pipeline_head = tape->pipeline_head; |
| 1794 | tape->controlled_pipeline_head_time = jiffies; |
| 1795 | } |
| 1796 | if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ)) |
| 1797 | tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time); |
| 1798 | else if (time_after(jiffies, tape->controlled_previous_head_time)) |
| 1799 | tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time); |
| 1800 | |
| 1801 | if (tape->nr_pending_stages < tape->max_stages /*- 1 */) { |
| 1802 | /* -1 for read mode error recovery */ |
| 1803 | if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) { |
| 1804 | tape->uncontrolled_pipeline_head_time = jiffies; |
| 1805 | tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time); |
| 1806 | } |
| 1807 | } else { |
| 1808 | tape->uncontrolled_previous_head_time = jiffies; |
| 1809 | tape->uncontrolled_previous_pipeline_head = tape->pipeline_head; |
| 1810 | if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) { |
| 1811 | tape->uncontrolled_pipeline_head_time = jiffies; |
| 1812 | } |
| 1813 | } |
| 1814 | tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed); |
| 1815 | if (tape->speed_control == 0) { |
| 1816 | tape->max_insert_speed = 5000; |
| 1817 | } else if (tape->speed_control == 1) { |
| 1818 | if (tape->nr_pending_stages >= tape->max_stages / 2) |
| 1819 | tape->max_insert_speed = tape->pipeline_head_speed + |
| 1820 | (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages; |
| 1821 | else |
| 1822 | tape->max_insert_speed = 500 + |
| 1823 | (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages; |
| 1824 | if (tape->nr_pending_stages >= tape->max_stages * 99 / 100) |
| 1825 | tape->max_insert_speed = 5000; |
| 1826 | } else if (tape->speed_control == 2) { |
| 1827 | tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 + |
| 1828 | (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages; |
| 1829 | } else |
| 1830 | tape->max_insert_speed = tape->speed_control; |
| 1831 | tape->max_insert_speed = max(tape->max_insert_speed, 500); |
| 1832 | } |
| 1833 | |
| 1834 | static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive) |
| 1835 | { |
| 1836 | idetape_tape_t *tape = drive->driver_data; |
| 1837 | idetape_pc_t *pc = tape->pc; |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1838 | u8 stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1839 | |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1840 | stat = drive->hwif->INB(IDE_STATUS_REG); |
| 1841 | if (stat & SEEK_STAT) { |
| 1842 | if (stat & ERR_STAT) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | /* Error detected */ |
| 1844 | if (pc->c[0] != IDETAPE_TEST_UNIT_READY_CMD) |
| 1845 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
| 1846 | tape->name); |
| 1847 | /* Retry operation */ |
| 1848 | return idetape_retry_pc(drive); |
| 1849 | } |
| 1850 | pc->error = 0; |
| 1851 | if (tape->failed_pc == pc) |
| 1852 | tape->failed_pc = NULL; |
| 1853 | } else { |
| 1854 | pc->error = IDETAPE_ERROR_GENERAL; |
| 1855 | tape->failed_pc = NULL; |
| 1856 | } |
| 1857 | return pc->callback(drive); |
| 1858 | } |
| 1859 | |
| 1860 | static ide_startstop_t idetape_rw_callback (ide_drive_t *drive) |
| 1861 | { |
| 1862 | idetape_tape_t *tape = drive->driver_data; |
| 1863 | struct request *rq = HWGROUP(drive)->rq; |
| 1864 | int blocks = tape->pc->actually_transferred / tape->tape_block_size; |
| 1865 | |
| 1866 | tape->avg_size += blocks * tape->tape_block_size; |
| 1867 | tape->insert_size += blocks * tape->tape_block_size; |
| 1868 | if (tape->insert_size > 1024 * 1024) |
| 1869 | tape->measure_insert_time = 1; |
| 1870 | if (tape->measure_insert_time) { |
| 1871 | tape->measure_insert_time = 0; |
| 1872 | tape->insert_time = jiffies; |
| 1873 | tape->insert_size = 0; |
| 1874 | } |
| 1875 | if (time_after(jiffies, tape->insert_time)) |
| 1876 | tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); |
Marcelo Feitoza Parisi | 9bae1ff | 2006-03-28 01:56:46 -0800 | [diff] [blame] | 1877 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1878 | tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024; |
| 1879 | tape->avg_size = 0; |
| 1880 | tape->avg_time = jiffies; |
| 1881 | } |
| 1882 | |
| 1883 | #if IDETAPE_DEBUG_LOG |
| 1884 | if (tape->debug_level >= 4) |
| 1885 | printk(KERN_INFO "ide-tape: Reached idetape_rw_callback\n"); |
| 1886 | #endif /* IDETAPE_DEBUG_LOG */ |
| 1887 | |
| 1888 | tape->first_frame_position += blocks; |
| 1889 | rq->current_nr_sectors -= blocks; |
| 1890 | |
| 1891 | if (!tape->pc->error) |
| 1892 | idetape_end_request(drive, 1, 0); |
| 1893 | else |
| 1894 | idetape_end_request(drive, tape->pc->error, 0); |
| 1895 | return ide_stopped; |
| 1896 | } |
| 1897 | |
| 1898 | static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) |
| 1899 | { |
| 1900 | idetape_init_pc(pc); |
| 1901 | pc->c[0] = IDETAPE_READ_CMD; |
| 1902 | put_unaligned(htonl(length), (unsigned int *) &pc->c[1]); |
| 1903 | pc->c[1] = 1; |
| 1904 | pc->callback = &idetape_rw_callback; |
| 1905 | pc->bh = bh; |
| 1906 | atomic_set(&bh->b_count, 0); |
| 1907 | pc->buffer = NULL; |
| 1908 | pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; |
| 1909 | if (pc->request_transfer == tape->stage_size) |
| 1910 | set_bit(PC_DMA_RECOMMENDED, &pc->flags); |
| 1911 | } |
| 1912 | |
| 1913 | static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) |
| 1914 | { |
| 1915 | int size = 32768; |
| 1916 | struct idetape_bh *p = bh; |
| 1917 | |
| 1918 | idetape_init_pc(pc); |
| 1919 | pc->c[0] = IDETAPE_READ_BUFFER_CMD; |
| 1920 | pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK; |
| 1921 | pc->c[7] = size >> 8; |
| 1922 | pc->c[8] = size & 0xff; |
| 1923 | pc->callback = &idetape_pc_callback; |
| 1924 | pc->bh = bh; |
| 1925 | atomic_set(&bh->b_count, 0); |
| 1926 | pc->buffer = NULL; |
| 1927 | while (p) { |
| 1928 | atomic_set(&p->b_count, 0); |
| 1929 | p = p->b_reqnext; |
| 1930 | } |
| 1931 | pc->request_transfer = pc->buffer_size = size; |
| 1932 | } |
| 1933 | |
| 1934 | static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) |
| 1935 | { |
| 1936 | idetape_init_pc(pc); |
| 1937 | pc->c[0] = IDETAPE_WRITE_CMD; |
| 1938 | put_unaligned(htonl(length), (unsigned int *) &pc->c[1]); |
| 1939 | pc->c[1] = 1; |
| 1940 | pc->callback = &idetape_rw_callback; |
| 1941 | set_bit(PC_WRITING, &pc->flags); |
| 1942 | pc->bh = bh; |
| 1943 | pc->b_data = bh->b_data; |
| 1944 | pc->b_count = atomic_read(&bh->b_count); |
| 1945 | pc->buffer = NULL; |
| 1946 | pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; |
| 1947 | if (pc->request_transfer == tape->stage_size) |
| 1948 | set_bit(PC_DMA_RECOMMENDED, &pc->flags); |
| 1949 | } |
| 1950 | |
| 1951 | /* |
| 1952 | * idetape_do_request is our request handling function. |
| 1953 | */ |
| 1954 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
| 1955 | struct request *rq, sector_t block) |
| 1956 | { |
| 1957 | idetape_tape_t *tape = drive->driver_data; |
| 1958 | idetape_pc_t *pc = NULL; |
| 1959 | struct request *postponed_rq = tape->postponed_rq; |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 1960 | u8 stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1961 | |
| 1962 | #if IDETAPE_DEBUG_LOG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1963 | if (tape->debug_level >= 2) |
| 1964 | printk(KERN_INFO "ide-tape: sector: %ld, " |
| 1965 | "nr_sectors: %ld, current_nr_sectors: %d\n", |
| 1966 | rq->sector, rq->nr_sectors, rq->current_nr_sectors); |
| 1967 | #endif /* IDETAPE_DEBUG_LOG */ |
| 1968 | |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 1969 | if (!blk_special_request(rq)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1970 | /* |
| 1971 | * We do not support buffer cache originated requests. |
| 1972 | */ |
| 1973 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 1974 | "request queue (%d)\n", drive->name, rq->cmd_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1975 | ide_end_request(drive, 0, 0); |
| 1976 | return ide_stopped; |
| 1977 | } |
| 1978 | |
| 1979 | /* |
| 1980 | * Retry a failed packet command |
| 1981 | */ |
| 1982 | if (tape->failed_pc != NULL && |
| 1983 | tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { |
| 1984 | return idetape_issue_packet_command(drive, tape->failed_pc); |
| 1985 | } |
| 1986 | #if IDETAPE_DEBUG_BUGS |
| 1987 | if (postponed_rq != NULL) |
| 1988 | if (rq != postponed_rq) { |
| 1989 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " |
| 1990 | "Two DSC requests were queued\n"); |
| 1991 | idetape_end_request(drive, 0, 0); |
| 1992 | return ide_stopped; |
| 1993 | } |
| 1994 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 1995 | |
| 1996 | tape->postponed_rq = NULL; |
| 1997 | |
| 1998 | /* |
| 1999 | * If the tape is still busy, postpone our request and service |
| 2000 | * the other device meanwhile. |
| 2001 | */ |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 2002 | stat = drive->hwif->INB(IDE_STATUS_REG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | |
| 2004 | if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2)) |
| 2005 | set_bit(IDETAPE_IGNORE_DSC, &tape->flags); |
| 2006 | |
| 2007 | if (drive->post_reset == 1) { |
| 2008 | set_bit(IDETAPE_IGNORE_DSC, &tape->flags); |
| 2009 | drive->post_reset = 0; |
| 2010 | } |
| 2011 | |
| 2012 | if (tape->tape_still_time > 100 && tape->tape_still_time < 200) |
| 2013 | tape->measure_insert_time = 1; |
| 2014 | if (time_after(jiffies, tape->insert_time)) |
| 2015 | tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); |
| 2016 | calculate_speeds(drive); |
| 2017 | if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) && |
Bartlomiej Zolnierkiewicz | 22c525b | 2008-01-25 22:17:11 +0100 | [diff] [blame] | 2018 | (stat & SEEK_STAT) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | if (postponed_rq == NULL) { |
| 2020 | tape->dsc_polling_start = jiffies; |
| 2021 | tape->dsc_polling_frequency = tape->best_dsc_rw_frequency; |
| 2022 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
| 2023 | } else if (time_after(jiffies, tape->dsc_timeout)) { |
| 2024 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", |
| 2025 | tape->name); |
| 2026 | if (rq->cmd[0] & REQ_IDETAPE_PC2) { |
| 2027 | idetape_media_access_finished(drive); |
| 2028 | return ide_stopped; |
| 2029 | } else { |
| 2030 | return ide_do_reset(drive); |
| 2031 | } |
Marcelo Feitoza Parisi | 9bae1ff | 2006-03-28 01:56:46 -0800 | [diff] [blame] | 2032 | } else if (time_after(jiffies, tape->dsc_polling_start + IDETAPE_DSC_MA_THRESHOLD)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW; |
| 2034 | idetape_postpone_request(drive); |
| 2035 | return ide_stopped; |
| 2036 | } |
| 2037 | if (rq->cmd[0] & REQ_IDETAPE_READ) { |
| 2038 | tape->buffer_head++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2039 | tape->postpone_cnt = 0; |
| 2040 | pc = idetape_next_pc_storage(drive); |
| 2041 | idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); |
| 2042 | goto out; |
| 2043 | } |
| 2044 | if (rq->cmd[0] & REQ_IDETAPE_WRITE) { |
| 2045 | tape->buffer_head++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2046 | tape->postpone_cnt = 0; |
| 2047 | pc = idetape_next_pc_storage(drive); |
| 2048 | idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); |
| 2049 | goto out; |
| 2050 | } |
| 2051 | if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) { |
| 2052 | tape->postpone_cnt = 0; |
| 2053 | pc = idetape_next_pc_storage(drive); |
| 2054 | idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); |
| 2055 | goto out; |
| 2056 | } |
| 2057 | if (rq->cmd[0] & REQ_IDETAPE_PC1) { |
| 2058 | pc = (idetape_pc_t *) rq->buffer; |
| 2059 | rq->cmd[0] &= ~(REQ_IDETAPE_PC1); |
| 2060 | rq->cmd[0] |= REQ_IDETAPE_PC2; |
| 2061 | goto out; |
| 2062 | } |
| 2063 | if (rq->cmd[0] & REQ_IDETAPE_PC2) { |
| 2064 | idetape_media_access_finished(drive); |
| 2065 | return ide_stopped; |
| 2066 | } |
| 2067 | BUG(); |
| 2068 | out: |
| 2069 | return idetape_issue_packet_command(drive, pc); |
| 2070 | } |
| 2071 | |
| 2072 | /* |
| 2073 | * Pipeline related functions |
| 2074 | */ |
| 2075 | static inline int idetape_pipeline_active (idetape_tape_t *tape) |
| 2076 | { |
| 2077 | int rc1, rc2; |
| 2078 | |
| 2079 | rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); |
| 2080 | rc2 = (tape->active_data_request != NULL); |
| 2081 | return rc1; |
| 2082 | } |
| 2083 | |
| 2084 | /* |
| 2085 | * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline |
| 2086 | * stage, along with all the necessary small buffers which together make |
| 2087 | * a buffer of size tape->stage_size (or a bit more). We attempt to |
| 2088 | * combine sequential pages as much as possible. |
| 2089 | * |
| 2090 | * Returns a pointer to the new allocated stage, or NULL if we |
| 2091 | * can't (or don't want to) allocate a stage. |
| 2092 | * |
| 2093 | * Pipeline stages are optional and are used to increase performance. |
| 2094 | * If we can't allocate them, we'll manage without them. |
| 2095 | */ |
| 2096 | static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear) |
| 2097 | { |
| 2098 | idetape_stage_t *stage; |
| 2099 | struct idetape_bh *prev_bh, *bh; |
| 2100 | int pages = tape->pages_per_stage; |
| 2101 | char *b_data = NULL; |
| 2102 | |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame] | 2103 | if ((stage = kmalloc(sizeof (idetape_stage_t),GFP_KERNEL)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | return NULL; |
| 2105 | stage->next = NULL; |
| 2106 | |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame] | 2107 | bh = stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2108 | if (bh == NULL) |
| 2109 | goto abort; |
| 2110 | bh->b_reqnext = NULL; |
| 2111 | if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) |
| 2112 | goto abort; |
| 2113 | if (clear) |
| 2114 | memset(bh->b_data, 0, PAGE_SIZE); |
| 2115 | bh->b_size = PAGE_SIZE; |
| 2116 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
| 2117 | |
| 2118 | while (--pages) { |
| 2119 | if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) |
| 2120 | goto abort; |
| 2121 | if (clear) |
| 2122 | memset(b_data, 0, PAGE_SIZE); |
| 2123 | if (bh->b_data == b_data + PAGE_SIZE) { |
| 2124 | bh->b_size += PAGE_SIZE; |
| 2125 | bh->b_data -= PAGE_SIZE; |
| 2126 | if (full) |
| 2127 | atomic_add(PAGE_SIZE, &bh->b_count); |
| 2128 | continue; |
| 2129 | } |
| 2130 | if (b_data == bh->b_data + bh->b_size) { |
| 2131 | bh->b_size += PAGE_SIZE; |
| 2132 | if (full) |
| 2133 | atomic_add(PAGE_SIZE, &bh->b_count); |
| 2134 | continue; |
| 2135 | } |
| 2136 | prev_bh = bh; |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame] | 2137 | if ((bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | free_page((unsigned long) b_data); |
| 2139 | goto abort; |
| 2140 | } |
| 2141 | bh->b_reqnext = NULL; |
| 2142 | bh->b_data = b_data; |
| 2143 | bh->b_size = PAGE_SIZE; |
| 2144 | atomic_set(&bh->b_count, full ? bh->b_size : 0); |
| 2145 | prev_bh->b_reqnext = bh; |
| 2146 | } |
| 2147 | bh->b_size -= tape->excess_bh_size; |
| 2148 | if (full) |
| 2149 | atomic_sub(tape->excess_bh_size, &bh->b_count); |
| 2150 | return stage; |
| 2151 | abort: |
| 2152 | __idetape_kfree_stage(stage); |
| 2153 | return NULL; |
| 2154 | } |
| 2155 | |
| 2156 | static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape) |
| 2157 | { |
| 2158 | idetape_stage_t *cache_stage = tape->cache_stage; |
| 2159 | |
| 2160 | #if IDETAPE_DEBUG_LOG |
| 2161 | if (tape->debug_level >= 4) |
| 2162 | printk(KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n"); |
| 2163 | #endif /* IDETAPE_DEBUG_LOG */ |
| 2164 | |
| 2165 | if (tape->nr_stages >= tape->max_stages) |
| 2166 | return NULL; |
| 2167 | if (cache_stage != NULL) { |
| 2168 | tape->cache_stage = NULL; |
| 2169 | return cache_stage; |
| 2170 | } |
| 2171 | return __idetape_kmalloc_stage(tape, 0, 0); |
| 2172 | } |
| 2173 | |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2174 | static int idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2175 | { |
| 2176 | struct idetape_bh *bh = tape->bh; |
| 2177 | int count; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2178 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2179 | |
| 2180 | while (n) { |
| 2181 | #if IDETAPE_DEBUG_BUGS |
| 2182 | if (bh == NULL) { |
| 2183 | printk(KERN_ERR "ide-tape: bh == NULL in " |
| 2184 | "idetape_copy_stage_from_user\n"); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2185 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2186 | } |
| 2187 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 2188 | count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2189 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count)) |
| 2190 | ret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | n -= count; |
| 2192 | atomic_add(count, &bh->b_count); |
| 2193 | buf += count; |
| 2194 | if (atomic_read(&bh->b_count) == bh->b_size) { |
| 2195 | bh = bh->b_reqnext; |
| 2196 | if (bh) |
| 2197 | atomic_set(&bh->b_count, 0); |
| 2198 | } |
| 2199 | } |
| 2200 | tape->bh = bh; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2201 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2202 | } |
| 2203 | |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2204 | static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2205 | { |
| 2206 | struct idetape_bh *bh = tape->bh; |
| 2207 | int count; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2208 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2209 | |
| 2210 | while (n) { |
| 2211 | #if IDETAPE_DEBUG_BUGS |
| 2212 | if (bh == NULL) { |
| 2213 | printk(KERN_ERR "ide-tape: bh == NULL in " |
| 2214 | "idetape_copy_stage_to_user\n"); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2215 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2216 | } |
| 2217 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 2218 | count = min(tape->b_count, n); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2219 | if (copy_to_user(buf, tape->b_data, count)) |
| 2220 | ret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | n -= count; |
| 2222 | tape->b_data += count; |
| 2223 | tape->b_count -= count; |
| 2224 | buf += count; |
| 2225 | if (!tape->b_count) { |
| 2226 | tape->bh = bh = bh->b_reqnext; |
| 2227 | if (bh) { |
| 2228 | tape->b_data = bh->b_data; |
| 2229 | tape->b_count = atomic_read(&bh->b_count); |
| 2230 | } |
| 2231 | } |
| 2232 | } |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 2233 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2234 | } |
| 2235 | |
| 2236 | static void idetape_init_merge_stage (idetape_tape_t *tape) |
| 2237 | { |
| 2238 | struct idetape_bh *bh = tape->merge_stage->bh; |
| 2239 | |
| 2240 | tape->bh = bh; |
| 2241 | if (tape->chrdev_direction == idetape_direction_write) |
| 2242 | atomic_set(&bh->b_count, 0); |
| 2243 | else { |
| 2244 | tape->b_data = bh->b_data; |
| 2245 | tape->b_count = atomic_read(&bh->b_count); |
| 2246 | } |
| 2247 | } |
| 2248 | |
| 2249 | static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage) |
| 2250 | { |
| 2251 | struct idetape_bh *tmp; |
| 2252 | |
| 2253 | tmp = stage->bh; |
| 2254 | stage->bh = tape->merge_stage->bh; |
| 2255 | tape->merge_stage->bh = tmp; |
| 2256 | idetape_init_merge_stage(tape); |
| 2257 | } |
| 2258 | |
| 2259 | /* |
| 2260 | * idetape_add_stage_tail adds a new stage at the end of the pipeline. |
| 2261 | */ |
| 2262 | static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage) |
| 2263 | { |
| 2264 | idetape_tape_t *tape = drive->driver_data; |
| 2265 | unsigned long flags; |
| 2266 | |
| 2267 | #if IDETAPE_DEBUG_LOG |
| 2268 | if (tape->debug_level >= 4) |
| 2269 | printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n"); |
| 2270 | #endif /* IDETAPE_DEBUG_LOG */ |
| 2271 | spin_lock_irqsave(&tape->spinlock, flags); |
| 2272 | stage->next = NULL; |
| 2273 | if (tape->last_stage != NULL) |
| 2274 | tape->last_stage->next=stage; |
| 2275 | else |
| 2276 | tape->first_stage = tape->next_stage=stage; |
| 2277 | tape->last_stage = stage; |
| 2278 | if (tape->next_stage == NULL) |
| 2279 | tape->next_stage = tape->last_stage; |
| 2280 | tape->nr_stages++; |
| 2281 | tape->nr_pending_stages++; |
| 2282 | spin_unlock_irqrestore(&tape->spinlock, flags); |
| 2283 | } |
| 2284 | |
| 2285 | /* |
| 2286 | * idetape_wait_for_request installs a completion in a pending request |
| 2287 | * and sleeps until it is serviced. |
| 2288 | * |
| 2289 | * The caller should ensure that the request will not be serviced |
| 2290 | * before we install the completion (usually by disabling interrupts). |
| 2291 | */ |
| 2292 | static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq) |
| 2293 | { |
Peter Zijlstra | 6e9a473 | 2006-09-30 23:28:10 -0700 | [diff] [blame] | 2294 | DECLARE_COMPLETION_ONSTACK(wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2295 | idetape_tape_t *tape = drive->driver_data; |
| 2296 | |
| 2297 | #if IDETAPE_DEBUG_BUGS |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 2298 | if (rq == NULL || !blk_special_request(rq)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2299 | printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n"); |
| 2300 | return; |
| 2301 | } |
| 2302 | #endif /* IDETAPE_DEBUG_BUGS */ |
Jens Axboe | c00895a | 2006-09-30 20:29:12 +0200 | [diff] [blame] | 2303 | rq->end_io_data = &wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2304 | rq->end_io = blk_end_sync_rq; |
| 2305 | spin_unlock_irq(&tape->spinlock); |
| 2306 | wait_for_completion(&wait); |
| 2307 | /* The stage and its struct request have been deallocated */ |
| 2308 | spin_lock_irq(&tape->spinlock); |
| 2309 | } |
| 2310 | |
| 2311 | static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive) |
| 2312 | { |
| 2313 | idetape_tape_t *tape = drive->driver_data; |
| 2314 | idetape_read_position_result_t *result; |
| 2315 | |
| 2316 | #if IDETAPE_DEBUG_LOG |
| 2317 | if (tape->debug_level >= 4) |
| 2318 | printk(KERN_INFO "ide-tape: Reached idetape_read_position_callback\n"); |
| 2319 | #endif /* IDETAPE_DEBUG_LOG */ |
| 2320 | |
| 2321 | if (!tape->pc->error) { |
| 2322 | result = (idetape_read_position_result_t *) tape->pc->buffer; |
| 2323 | #if IDETAPE_DEBUG_LOG |
| 2324 | if (tape->debug_level >= 2) |
| 2325 | printk(KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No"); |
| 2326 | if (tape->debug_level >= 2) |
| 2327 | printk(KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No"); |
| 2328 | #endif /* IDETAPE_DEBUG_LOG */ |
| 2329 | if (result->bpu) { |
| 2330 | printk(KERN_INFO "ide-tape: Block location is unknown to the tape\n"); |
| 2331 | clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags); |
| 2332 | idetape_end_request(drive, 0, 0); |
| 2333 | } else { |
| 2334 | #if IDETAPE_DEBUG_LOG |
| 2335 | if (tape->debug_level >= 2) |
| 2336 | printk(KERN_INFO "ide-tape: Block Location - %u\n", ntohl(result->first_block)); |
| 2337 | #endif /* IDETAPE_DEBUG_LOG */ |
| 2338 | tape->partition = result->partition; |
| 2339 | tape->first_frame_position = ntohl(result->first_block); |
| 2340 | tape->last_frame_position = ntohl(result->last_block); |
| 2341 | tape->blocks_in_buffer = result->blocks_in_buffer[2]; |
| 2342 | set_bit(IDETAPE_ADDRESS_VALID, &tape->flags); |
| 2343 | idetape_end_request(drive, 1, 0); |
| 2344 | } |
| 2345 | } else { |
| 2346 | idetape_end_request(drive, 0, 0); |
| 2347 | } |
| 2348 | return ide_stopped; |
| 2349 | } |
| 2350 | |
| 2351 | /* |
| 2352 | * idetape_create_write_filemark_cmd will: |
| 2353 | * |
| 2354 | * 1. Write a filemark if write_filemark=1. |
| 2355 | * 2. Flush the device buffers without writing a filemark |
| 2356 | * if write_filemark=0. |
| 2357 | * |
| 2358 | */ |
| 2359 | static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark) |
| 2360 | { |
| 2361 | idetape_init_pc(pc); |
| 2362 | pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD; |
| 2363 | pc->c[4] = write_filemark; |
| 2364 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); |
| 2365 | pc->callback = &idetape_pc_callback; |
| 2366 | } |
| 2367 | |
| 2368 | static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc) |
| 2369 | { |
| 2370 | idetape_init_pc(pc); |
| 2371 | pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD; |
| 2372 | pc->callback = &idetape_pc_callback; |
| 2373 | } |
| 2374 | |
| 2375 | /* |
| 2376 | * idetape_queue_pc_tail is based on the following functions: |
| 2377 | * |
| 2378 | * ide_do_drive_cmd from ide.c |
| 2379 | * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c |
| 2380 | * |
| 2381 | * We add a special packet command request to the tail of the request |
| 2382 | * queue, and wait for it to be serviced. |
| 2383 | * |
| 2384 | * This is not to be called from within the request handling part |
| 2385 | * of the driver ! We allocate here data in the stack, and it is valid |
| 2386 | * until the request is finished. This is not the case for the bottom |
| 2387 | * part of the driver, where we are always leaving the functions to wait |
| 2388 | * for an interrupt or a timer event. |
| 2389 | * |
| 2390 | * From the bottom part of the driver, we should allocate safe memory |
| 2391 | * using idetape_next_pc_storage and idetape_next_rq_storage, and add |
| 2392 | * the request to the request list without waiting for it to be serviced ! |
| 2393 | * In that case, we usually use idetape_queue_pc_head. |
| 2394 | */ |
| 2395 | static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc) |
| 2396 | { |
| 2397 | struct ide_tape_obj *tape = drive->driver_data; |
| 2398 | struct request rq; |
| 2399 | |
| 2400 | idetape_init_rq(&rq, REQ_IDETAPE_PC1); |
| 2401 | rq.buffer = (char *) pc; |
| 2402 | rq.rq_disk = tape->disk; |
| 2403 | return ide_do_drive_cmd(drive, &rq, ide_wait); |
| 2404 | } |
| 2405 | |
| 2406 | static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd) |
| 2407 | { |
| 2408 | idetape_init_pc(pc); |
| 2409 | pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD; |
| 2410 | pc->c[4] = cmd; |
| 2411 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); |
| 2412 | pc->callback = &idetape_pc_callback; |
| 2413 | } |
| 2414 | |
| 2415 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) |
| 2416 | { |
| 2417 | idetape_tape_t *tape = drive->driver_data; |
| 2418 | idetape_pc_t pc; |
| 2419 | int load_attempted = 0; |
| 2420 | |
| 2421 | /* |
| 2422 | * Wait for the tape to become ready |
| 2423 | */ |
| 2424 | set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); |
| 2425 | timeout += jiffies; |
| 2426 | while (time_before(jiffies, timeout)) { |
| 2427 | idetape_create_test_unit_ready_cmd(&pc); |
| 2428 | if (!__idetape_queue_pc_tail(drive, &pc)) |
| 2429 | return 0; |
| 2430 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) |
| 2431 | || (tape->asc == 0x3A)) { /* no media */ |
| 2432 | if (load_attempted) |
| 2433 | return -ENOMEDIUM; |
| 2434 | idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); |
| 2435 | __idetape_queue_pc_tail(drive, &pc); |
| 2436 | load_attempted = 1; |
| 2437 | /* not about to be ready */ |
| 2438 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && |
| 2439 | (tape->ascq == 1 || tape->ascq == 8))) |
| 2440 | return -EIO; |
Nishanth Aravamudan | 80ce45f | 2005-09-10 00:27:08 -0700 | [diff] [blame] | 2441 | msleep(100); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2442 | } |
| 2443 | return -EIO; |
| 2444 | } |
| 2445 | |
| 2446 | static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc) |
| 2447 | { |
| 2448 | return __idetape_queue_pc_tail(drive, pc); |
| 2449 | } |
| 2450 | |
| 2451 | static int idetape_flush_tape_buffers (ide_drive_t *drive) |
| 2452 | { |
| 2453 | idetape_pc_t pc; |
| 2454 | int rc; |
| 2455 | |
| 2456 | idetape_create_write_filemark_cmd(drive, &pc, 0); |
| 2457 | if ((rc = idetape_queue_pc_tail(drive, &pc))) |
| 2458 | return rc; |
| 2459 | idetape_wait_ready(drive, 60 * 5 * HZ); |
| 2460 | return 0; |
| 2461 | } |
| 2462 | |
| 2463 | static void idetape_create_read_position_cmd (idetape_pc_t *pc) |
| 2464 | { |
| 2465 | idetape_init_pc(pc); |
| 2466 | pc->c[0] = IDETAPE_READ_POSITION_CMD; |
| 2467 | pc->request_transfer = 20; |
| 2468 | pc->callback = &idetape_read_position_callback; |
| 2469 | } |
| 2470 | |
| 2471 | static int idetape_read_position (ide_drive_t *drive) |
| 2472 | { |
| 2473 | idetape_tape_t *tape = drive->driver_data; |
| 2474 | idetape_pc_t pc; |
| 2475 | int position; |
| 2476 | |
| 2477 | #if IDETAPE_DEBUG_LOG |
| 2478 | if (tape->debug_level >= 4) |
| 2479 | printk(KERN_INFO "ide-tape: Reached idetape_read_position\n"); |
| 2480 | #endif /* IDETAPE_DEBUG_LOG */ |
| 2481 | |
| 2482 | idetape_create_read_position_cmd(&pc); |
| 2483 | if (idetape_queue_pc_tail(drive, &pc)) |
| 2484 | return -1; |
| 2485 | position = tape->first_frame_position; |
| 2486 | return position; |
| 2487 | } |
| 2488 | |
| 2489 | static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip) |
| 2490 | { |
| 2491 | idetape_init_pc(pc); |
| 2492 | pc->c[0] = IDETAPE_LOCATE_CMD; |
| 2493 | pc->c[1] = 2; |
| 2494 | put_unaligned(htonl(block), (unsigned int *) &pc->c[3]); |
| 2495 | pc->c[8] = partition; |
| 2496 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); |
| 2497 | pc->callback = &idetape_pc_callback; |
| 2498 | } |
| 2499 | |
| 2500 | static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent) |
| 2501 | { |
| 2502 | idetape_tape_t *tape = drive->driver_data; |
| 2503 | |
| 2504 | if (!tape->capabilities.lock) |
| 2505 | return 0; |
| 2506 | |
| 2507 | idetape_init_pc(pc); |
| 2508 | pc->c[0] = IDETAPE_PREVENT_CMD; |
| 2509 | pc->c[4] = prevent; |
| 2510 | pc->callback = &idetape_pc_callback; |
| 2511 | return 1; |
| 2512 | } |
| 2513 | |
| 2514 | static int __idetape_discard_read_pipeline (ide_drive_t *drive) |
| 2515 | { |
| 2516 | idetape_tape_t *tape = drive->driver_data; |
| 2517 | unsigned long flags; |
| 2518 | int cnt; |
| 2519 | |
| 2520 | if (tape->chrdev_direction != idetape_direction_read) |
| 2521 | return 0; |
| 2522 | |
| 2523 | /* Remove merge stage. */ |
| 2524 | cnt = tape->merge_stage_size / tape->tape_block_size; |
| 2525 | if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) |
| 2526 | ++cnt; /* Filemarks count as 1 sector */ |
| 2527 | tape->merge_stage_size = 0; |
| 2528 | if (tape->merge_stage != NULL) { |
| 2529 | __idetape_kfree_stage(tape->merge_stage); |
| 2530 | tape->merge_stage = NULL; |
| 2531 | } |
| 2532 | |
| 2533 | /* Clear pipeline flags. */ |
| 2534 | clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); |
| 2535 | tape->chrdev_direction = idetape_direction_none; |
| 2536 | |
| 2537 | /* Remove pipeline stages. */ |
| 2538 | if (tape->first_stage == NULL) |
| 2539 | return 0; |
| 2540 | |
| 2541 | spin_lock_irqsave(&tape->spinlock, flags); |
| 2542 | tape->next_stage = NULL; |
| 2543 | if (idetape_pipeline_active(tape)) |
| 2544 | idetape_wait_for_request(drive, tape->active_data_request); |
| 2545 | spin_unlock_irqrestore(&tape->spinlock, flags); |
| 2546 | |
| 2547 | while (tape->first_stage != NULL) { |
| 2548 | struct request *rq_ptr = &tape->first_stage->rq; |
| 2549 | |
| 2550 | cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors; |
| 2551 | if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) |
| 2552 | ++cnt; |
| 2553 | idetape_remove_stage_head(drive); |
| 2554 | } |
| 2555 | tape->nr_pending_stages = 0; |
| 2556 | tape->max_stages = tape->min_pipeline; |
| 2557 | return cnt; |
| 2558 | } |
| 2559 | |
| 2560 | /* |
| 2561 | * idetape_position_tape positions the tape to the requested block |
| 2562 | * using the LOCATE packet command. A READ POSITION command is then |
| 2563 | * issued to check where we are positioned. |
| 2564 | * |
| 2565 | * Like all higher level operations, we queue the commands at the tail |
| 2566 | * of the request queue and wait for their completion. |
| 2567 | * |
| 2568 | */ |
| 2569 | static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip) |
| 2570 | { |
| 2571 | idetape_tape_t *tape = drive->driver_data; |
| 2572 | int retval; |
| 2573 | idetape_pc_t pc; |
| 2574 | |
| 2575 | if (tape->chrdev_direction == idetape_direction_read) |
| 2576 | __idetape_discard_read_pipeline(drive); |
| 2577 | idetape_wait_ready(drive, 60 * 5 * HZ); |
| 2578 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); |
| 2579 | retval = idetape_queue_pc_tail(drive, &pc); |
| 2580 | if (retval) |
| 2581 | return (retval); |
| 2582 | |
| 2583 | idetape_create_read_position_cmd(&pc); |
| 2584 | return (idetape_queue_pc_tail(drive, &pc)); |
| 2585 | } |
| 2586 | |
| 2587 | static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position) |
| 2588 | { |
| 2589 | idetape_tape_t *tape = drive->driver_data; |
| 2590 | int cnt; |
| 2591 | int seek, position; |
| 2592 | |
| 2593 | cnt = __idetape_discard_read_pipeline(drive); |
| 2594 | if (restore_position) { |
| 2595 | position = idetape_read_position(drive); |
| 2596 | seek = position > cnt ? position - cnt : 0; |
| 2597 | if (idetape_position_tape(drive, seek, 0, 0)) { |
| 2598 | printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name); |
| 2599 | return; |
| 2600 | } |
| 2601 | } |
| 2602 | } |
| 2603 | |
| 2604 | /* |
| 2605 | * idetape_queue_rw_tail generates a read/write request for the block |
| 2606 | * device interface and wait for it to be serviced. |
| 2607 | */ |
| 2608 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh) |
| 2609 | { |
| 2610 | idetape_tape_t *tape = drive->driver_data; |
| 2611 | struct request rq; |
| 2612 | |
| 2613 | #if IDETAPE_DEBUG_LOG |
| 2614 | if (tape->debug_level >= 2) |
| 2615 | printk(KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd); |
| 2616 | #endif /* IDETAPE_DEBUG_LOG */ |
| 2617 | #if IDETAPE_DEBUG_BUGS |
| 2618 | if (idetape_pipeline_active(tape)) { |
| 2619 | printk(KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n"); |
| 2620 | return (0); |
| 2621 | } |
| 2622 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 2623 | |
| 2624 | idetape_init_rq(&rq, cmd); |
| 2625 | rq.rq_disk = tape->disk; |
| 2626 | rq.special = (void *)bh; |
| 2627 | rq.sector = tape->first_frame_position; |
| 2628 | rq.nr_sectors = rq.current_nr_sectors = blocks; |
| 2629 | (void) ide_do_drive_cmd(drive, &rq, ide_wait); |
| 2630 | |
| 2631 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) |
| 2632 | return 0; |
| 2633 | |
| 2634 | if (tape->merge_stage) |
| 2635 | idetape_init_merge_stage(tape); |
| 2636 | if (rq.errors == IDETAPE_ERROR_GENERAL) |
| 2637 | return -EIO; |
| 2638 | return (tape->tape_block_size * (blocks-rq.current_nr_sectors)); |
| 2639 | } |
| 2640 | |
| 2641 | /* |
| 2642 | * idetape_insert_pipeline_into_queue is used to start servicing the |
| 2643 | * pipeline stages, starting from tape->next_stage. |
| 2644 | */ |
| 2645 | static void idetape_insert_pipeline_into_queue (ide_drive_t *drive) |
| 2646 | { |
| 2647 | idetape_tape_t *tape = drive->driver_data; |
| 2648 | |
| 2649 | if (tape->next_stage == NULL) |
| 2650 | return; |
| 2651 | if (!idetape_pipeline_active(tape)) { |
| 2652 | set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); |
| 2653 | idetape_active_next_stage(drive); |
| 2654 | (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end); |
| 2655 | } |
| 2656 | } |
| 2657 | |
| 2658 | static void idetape_create_inquiry_cmd (idetape_pc_t *pc) |
| 2659 | { |
| 2660 | idetape_init_pc(pc); |
| 2661 | pc->c[0] = IDETAPE_INQUIRY_CMD; |
| 2662 | pc->c[4] = pc->request_transfer = 254; |
| 2663 | pc->callback = &idetape_pc_callback; |
| 2664 | } |
| 2665 | |
| 2666 | static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc) |
| 2667 | { |
| 2668 | idetape_init_pc(pc); |
| 2669 | pc->c[0] = IDETAPE_REWIND_CMD; |
| 2670 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); |
| 2671 | pc->callback = &idetape_pc_callback; |
| 2672 | } |
| 2673 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2674 | static void idetape_create_erase_cmd (idetape_pc_t *pc) |
| 2675 | { |
| 2676 | idetape_init_pc(pc); |
| 2677 | pc->c[0] = IDETAPE_ERASE_CMD; |
| 2678 | pc->c[1] = 1; |
| 2679 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); |
| 2680 | pc->callback = &idetape_pc_callback; |
| 2681 | } |
| 2682 | |
| 2683 | static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd) |
| 2684 | { |
| 2685 | idetape_init_pc(pc); |
| 2686 | pc->c[0] = IDETAPE_SPACE_CMD; |
| 2687 | put_unaligned(htonl(count), (unsigned int *) &pc->c[1]); |
| 2688 | pc->c[1] = cmd; |
| 2689 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); |
| 2690 | pc->callback = &idetape_pc_callback; |
| 2691 | } |
| 2692 | |
| 2693 | static void idetape_wait_first_stage (ide_drive_t *drive) |
| 2694 | { |
| 2695 | idetape_tape_t *tape = drive->driver_data; |
| 2696 | unsigned long flags; |
| 2697 | |
| 2698 | if (tape->first_stage == NULL) |
| 2699 | return; |
| 2700 | spin_lock_irqsave(&tape->spinlock, flags); |
| 2701 | if (tape->active_stage == tape->first_stage) |
| 2702 | idetape_wait_for_request(drive, tape->active_data_request); |
| 2703 | spin_unlock_irqrestore(&tape->spinlock, flags); |
| 2704 | } |
| 2705 | |
| 2706 | /* |
| 2707 | * idetape_add_chrdev_write_request tries to add a character device |
| 2708 | * originated write request to our pipeline. In case we don't succeed, |
| 2709 | * we revert to non-pipelined operation mode for this request. |
| 2710 | * |
| 2711 | * 1. Try to allocate a new pipeline stage. |
| 2712 | * 2. If we can't, wait for more and more requests to be serviced |
| 2713 | * and try again each time. |
| 2714 | * 3. If we still can't allocate a stage, fallback to |
| 2715 | * non-pipelined operation mode for this request. |
| 2716 | */ |
| 2717 | static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks) |
| 2718 | { |
| 2719 | idetape_tape_t *tape = drive->driver_data; |
| 2720 | idetape_stage_t *new_stage; |
| 2721 | unsigned long flags; |
| 2722 | struct request *rq; |
| 2723 | |
| 2724 | #if IDETAPE_DEBUG_LOG |
| 2725 | if (tape->debug_level >= 3) |
| 2726 | printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n"); |
| 2727 | #endif /* IDETAPE_DEBUG_LOG */ |
| 2728 | |
| 2729 | /* |
| 2730 | * Attempt to allocate a new stage. |
| 2731 | * Pay special attention to possible race conditions. |
| 2732 | */ |
| 2733 | while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) { |
| 2734 | spin_lock_irqsave(&tape->spinlock, flags); |
| 2735 | if (idetape_pipeline_active(tape)) { |
| 2736 | idetape_wait_for_request(drive, tape->active_data_request); |
| 2737 | spin_unlock_irqrestore(&tape->spinlock, flags); |
| 2738 | } else { |
| 2739 | spin_unlock_irqrestore(&tape->spinlock, flags); |
| 2740 | idetape_insert_pipeline_into_queue(drive); |
| 2741 | if (idetape_pipeline_active(tape)) |
| 2742 | continue; |
| 2743 | /* |
| 2744 | * Linux is short on memory. Fallback to |
| 2745 | * non-pipelined operation mode for this request. |
| 2746 | */ |
| 2747 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); |
| 2748 | } |
| 2749 | } |
| 2750 | rq = &new_stage->rq; |
| 2751 | idetape_init_rq(rq, REQ_IDETAPE_WRITE); |
| 2752 | /* Doesn't actually matter - We always assume sequential access */ |
| 2753 | rq->sector = tape->first_frame_position; |
| 2754 | rq->nr_sectors = rq->current_nr_sectors = blocks; |
| 2755 | |
| 2756 | idetape_switch_buffers(tape, new_stage); |
| 2757 | idetape_add_stage_tail(drive, new_stage); |
| 2758 | tape->pipeline_head++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2759 | calculate_speeds(drive); |
| 2760 | |
| 2761 | /* |
| 2762 | * Estimate whether the tape has stopped writing by checking |
| 2763 | * if our write pipeline is currently empty. If we are not |
| 2764 | * writing anymore, wait for the pipeline to be full enough |
| 2765 | * (90%) before starting to service requests, so that we will |
| 2766 | * be able to keep up with the higher speeds of the tape. |
| 2767 | */ |
| 2768 | if (!idetape_pipeline_active(tape)) { |
| 2769 | if (tape->nr_stages >= tape->max_stages * 9 / 10 || |
| 2770 | tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) { |
| 2771 | tape->measure_insert_time = 1; |
| 2772 | tape->insert_time = jiffies; |
| 2773 | tape->insert_size = 0; |
| 2774 | tape->insert_speed = 0; |
| 2775 | idetape_insert_pipeline_into_queue(drive); |
| 2776 | } |
| 2777 | } |
| 2778 | if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) |
| 2779 | /* Return a deferred error */ |
| 2780 | return -EIO; |
| 2781 | return blocks; |
| 2782 | } |
| 2783 | |
| 2784 | /* |
| 2785 | * idetape_wait_for_pipeline will wait until all pending pipeline |
| 2786 | * requests are serviced. Typically called on device close. |
| 2787 | */ |
| 2788 | static void idetape_wait_for_pipeline (ide_drive_t *drive) |
| 2789 | { |
| 2790 | idetape_tape_t *tape = drive->driver_data; |
| 2791 | unsigned long flags; |
| 2792 | |
| 2793 | while (tape->next_stage || idetape_pipeline_active(tape)) { |
| 2794 | idetape_insert_pipeline_into_queue(drive); |
| 2795 | spin_lock_irqsave(&tape->spinlock, flags); |
| 2796 | if (idetape_pipeline_active(tape)) |
| 2797 | idetape_wait_for_request(drive, tape->active_data_request); |
| 2798 | spin_unlock_irqrestore(&tape->spinlock, flags); |
| 2799 | } |
| 2800 | } |
| 2801 | |
| 2802 | static void idetape_empty_write_pipeline (ide_drive_t *drive) |
| 2803 | { |
| 2804 | idetape_tape_t *tape = drive->driver_data; |
| 2805 | int blocks, min; |
| 2806 | struct idetape_bh *bh; |
| 2807 | |
| 2808 | #if IDETAPE_DEBUG_BUGS |
| 2809 | if (tape->chrdev_direction != idetape_direction_write) { |
| 2810 | printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n"); |
| 2811 | return; |
| 2812 | } |
| 2813 | if (tape->merge_stage_size > tape->stage_size) { |
| 2814 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
| 2815 | tape->merge_stage_size = tape->stage_size; |
| 2816 | } |
| 2817 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 2818 | if (tape->merge_stage_size) { |
| 2819 | blocks = tape->merge_stage_size / tape->tape_block_size; |
| 2820 | if (tape->merge_stage_size % tape->tape_block_size) { |
| 2821 | unsigned int i; |
| 2822 | |
| 2823 | blocks++; |
| 2824 | i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size; |
| 2825 | bh = tape->bh->b_reqnext; |
| 2826 | while (bh) { |
| 2827 | atomic_set(&bh->b_count, 0); |
| 2828 | bh = bh->b_reqnext; |
| 2829 | } |
| 2830 | bh = tape->bh; |
| 2831 | while (i) { |
| 2832 | if (bh == NULL) { |
| 2833 | |
| 2834 | printk(KERN_INFO "ide-tape: bug, bh NULL\n"); |
| 2835 | break; |
| 2836 | } |
| 2837 | min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count))); |
| 2838 | memset(bh->b_data + atomic_read(&bh->b_count), 0, min); |
| 2839 | atomic_add(min, &bh->b_count); |
| 2840 | i -= min; |
| 2841 | bh = bh->b_reqnext; |
| 2842 | } |
| 2843 | } |
| 2844 | (void) idetape_add_chrdev_write_request(drive, blocks); |
| 2845 | tape->merge_stage_size = 0; |
| 2846 | } |
| 2847 | idetape_wait_for_pipeline(drive); |
| 2848 | if (tape->merge_stage != NULL) { |
| 2849 | __idetape_kfree_stage(tape->merge_stage); |
| 2850 | tape->merge_stage = NULL; |
| 2851 | } |
| 2852 | clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); |
| 2853 | tape->chrdev_direction = idetape_direction_none; |
| 2854 | |
| 2855 | /* |
| 2856 | * On the next backup, perform the feedback loop again. |
| 2857 | * (I don't want to keep sense information between backups, |
| 2858 | * as some systems are constantly on, and the system load |
| 2859 | * can be totally different on the next backup). |
| 2860 | */ |
| 2861 | tape->max_stages = tape->min_pipeline; |
| 2862 | #if IDETAPE_DEBUG_BUGS |
| 2863 | if (tape->first_stage != NULL || |
| 2864 | tape->next_stage != NULL || |
| 2865 | tape->last_stage != NULL || |
| 2866 | tape->nr_stages != 0) { |
| 2867 | printk(KERN_ERR "ide-tape: ide-tape pipeline bug, " |
| 2868 | "first_stage %p, next_stage %p, " |
| 2869 | "last_stage %p, nr_stages %d\n", |
| 2870 | tape->first_stage, tape->next_stage, |
| 2871 | tape->last_stage, tape->nr_stages); |
| 2872 | } |
| 2873 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 2874 | } |
| 2875 | |
| 2876 | static void idetape_restart_speed_control (ide_drive_t *drive) |
| 2877 | { |
| 2878 | idetape_tape_t *tape = drive->driver_data; |
| 2879 | |
| 2880 | tape->restart_speed_control_req = 0; |
| 2881 | tape->pipeline_head = 0; |
| 2882 | tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0; |
| 2883 | tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0; |
| 2884 | tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000; |
| 2885 | tape->uncontrolled_pipeline_head_speed = 0; |
| 2886 | tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies; |
| 2887 | tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies; |
| 2888 | } |
| 2889 | |
| 2890 | static int idetape_initiate_read (ide_drive_t *drive, int max_stages) |
| 2891 | { |
| 2892 | idetape_tape_t *tape = drive->driver_data; |
| 2893 | idetape_stage_t *new_stage; |
| 2894 | struct request rq; |
| 2895 | int bytes_read; |
| 2896 | int blocks = tape->capabilities.ctl; |
| 2897 | |
| 2898 | /* Initialize read operation */ |
| 2899 | if (tape->chrdev_direction != idetape_direction_read) { |
| 2900 | if (tape->chrdev_direction == idetape_direction_write) { |
| 2901 | idetape_empty_write_pipeline(drive); |
| 2902 | idetape_flush_tape_buffers(drive); |
| 2903 | } |
| 2904 | #if IDETAPE_DEBUG_BUGS |
| 2905 | if (tape->merge_stage || tape->merge_stage_size) { |
| 2906 | printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n"); |
| 2907 | tape->merge_stage_size = 0; |
| 2908 | } |
| 2909 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 2910 | if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) |
| 2911 | return -ENOMEM; |
| 2912 | tape->chrdev_direction = idetape_direction_read; |
| 2913 | |
| 2914 | /* |
| 2915 | * Issue a read 0 command to ensure that DSC handshake |
| 2916 | * is switched from completion mode to buffer available |
| 2917 | * mode. |
| 2918 | * No point in issuing this if DSC overlap isn't supported, |
| 2919 | * some drives (Seagate STT3401A) will return an error. |
| 2920 | */ |
| 2921 | if (drive->dsc_overlap) { |
| 2922 | bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh); |
| 2923 | if (bytes_read < 0) { |
| 2924 | __idetape_kfree_stage(tape->merge_stage); |
| 2925 | tape->merge_stage = NULL; |
| 2926 | tape->chrdev_direction = idetape_direction_none; |
| 2927 | return bytes_read; |
| 2928 | } |
| 2929 | } |
| 2930 | } |
| 2931 | if (tape->restart_speed_control_req) |
| 2932 | idetape_restart_speed_control(drive); |
| 2933 | idetape_init_rq(&rq, REQ_IDETAPE_READ); |
| 2934 | rq.sector = tape->first_frame_position; |
| 2935 | rq.nr_sectors = rq.current_nr_sectors = blocks; |
| 2936 | if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) && |
| 2937 | tape->nr_stages < max_stages) { |
| 2938 | new_stage = idetape_kmalloc_stage(tape); |
| 2939 | while (new_stage != NULL) { |
| 2940 | new_stage->rq = rq; |
| 2941 | idetape_add_stage_tail(drive, new_stage); |
| 2942 | if (tape->nr_stages >= max_stages) |
| 2943 | break; |
| 2944 | new_stage = idetape_kmalloc_stage(tape); |
| 2945 | } |
| 2946 | } |
| 2947 | if (!idetape_pipeline_active(tape)) { |
| 2948 | if (tape->nr_pending_stages >= 3 * max_stages / 4) { |
| 2949 | tape->measure_insert_time = 1; |
| 2950 | tape->insert_time = jiffies; |
| 2951 | tape->insert_size = 0; |
| 2952 | tape->insert_speed = 0; |
| 2953 | idetape_insert_pipeline_into_queue(drive); |
| 2954 | } |
| 2955 | } |
| 2956 | return 0; |
| 2957 | } |
| 2958 | |
| 2959 | /* |
| 2960 | * idetape_add_chrdev_read_request is called from idetape_chrdev_read |
| 2961 | * to service a character device read request and add read-ahead |
| 2962 | * requests to our pipeline. |
| 2963 | */ |
| 2964 | static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks) |
| 2965 | { |
| 2966 | idetape_tape_t *tape = drive->driver_data; |
| 2967 | unsigned long flags; |
| 2968 | struct request *rq_ptr; |
| 2969 | int bytes_read; |
| 2970 | |
| 2971 | #if IDETAPE_DEBUG_LOG |
| 2972 | if (tape->debug_level >= 4) |
| 2973 | printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks); |
| 2974 | #endif /* IDETAPE_DEBUG_LOG */ |
| 2975 | |
| 2976 | /* |
| 2977 | * If we are at a filemark, return a read length of 0 |
| 2978 | */ |
| 2979 | if (test_bit(IDETAPE_FILEMARK, &tape->flags)) |
| 2980 | return 0; |
| 2981 | |
| 2982 | /* |
| 2983 | * Wait for the next block to be available at the head |
| 2984 | * of the pipeline |
| 2985 | */ |
| 2986 | idetape_initiate_read(drive, tape->max_stages); |
| 2987 | if (tape->first_stage == NULL) { |
| 2988 | if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) |
| 2989 | return 0; |
| 2990 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh); |
| 2991 | } |
| 2992 | idetape_wait_first_stage(drive); |
| 2993 | rq_ptr = &tape->first_stage->rq; |
| 2994 | bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors); |
| 2995 | rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0; |
| 2996 | |
| 2997 | |
| 2998 | if (rq_ptr->errors == IDETAPE_ERROR_EOD) |
| 2999 | return 0; |
| 3000 | else { |
| 3001 | idetape_switch_buffers(tape, tape->first_stage); |
| 3002 | if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) |
| 3003 | set_bit(IDETAPE_FILEMARK, &tape->flags); |
| 3004 | spin_lock_irqsave(&tape->spinlock, flags); |
| 3005 | idetape_remove_stage_head(drive); |
| 3006 | spin_unlock_irqrestore(&tape->spinlock, flags); |
| 3007 | tape->pipeline_head++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3008 | calculate_speeds(drive); |
| 3009 | } |
| 3010 | #if IDETAPE_DEBUG_BUGS |
| 3011 | if (bytes_read > blocks * tape->tape_block_size) { |
| 3012 | printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n"); |
| 3013 | bytes_read = blocks * tape->tape_block_size; |
| 3014 | } |
| 3015 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 3016 | return (bytes_read); |
| 3017 | } |
| 3018 | |
| 3019 | static void idetape_pad_zeros (ide_drive_t *drive, int bcount) |
| 3020 | { |
| 3021 | idetape_tape_t *tape = drive->driver_data; |
| 3022 | struct idetape_bh *bh; |
| 3023 | int blocks; |
| 3024 | |
| 3025 | while (bcount) { |
| 3026 | unsigned int count; |
| 3027 | |
| 3028 | bh = tape->merge_stage->bh; |
| 3029 | count = min(tape->stage_size, bcount); |
| 3030 | bcount -= count; |
| 3031 | blocks = count / tape->tape_block_size; |
| 3032 | while (count) { |
| 3033 | atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size)); |
| 3034 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
| 3035 | count -= atomic_read(&bh->b_count); |
| 3036 | bh = bh->b_reqnext; |
| 3037 | } |
| 3038 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); |
| 3039 | } |
| 3040 | } |
| 3041 | |
| 3042 | static int idetape_pipeline_size (ide_drive_t *drive) |
| 3043 | { |
| 3044 | idetape_tape_t *tape = drive->driver_data; |
| 3045 | idetape_stage_t *stage; |
| 3046 | struct request *rq; |
| 3047 | int size = 0; |
| 3048 | |
| 3049 | idetape_wait_for_pipeline(drive); |
| 3050 | stage = tape->first_stage; |
| 3051 | while (stage != NULL) { |
| 3052 | rq = &stage->rq; |
| 3053 | size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors); |
| 3054 | if (rq->errors == IDETAPE_ERROR_FILEMARK) |
| 3055 | size += tape->tape_block_size; |
| 3056 | stage = stage->next; |
| 3057 | } |
| 3058 | size += tape->merge_stage_size; |
| 3059 | return size; |
| 3060 | } |
| 3061 | |
| 3062 | /* |
| 3063 | * Rewinds the tape to the Beginning Of the current Partition (BOP). |
| 3064 | * |
| 3065 | * We currently support only one partition. |
| 3066 | */ |
| 3067 | static int idetape_rewind_tape (ide_drive_t *drive) |
| 3068 | { |
| 3069 | int retval; |
| 3070 | idetape_pc_t pc; |
| 3071 | #if IDETAPE_DEBUG_LOG |
| 3072 | idetape_tape_t *tape = drive->driver_data; |
| 3073 | if (tape->debug_level >= 2) |
| 3074 | printk(KERN_INFO "ide-tape: Reached idetape_rewind_tape\n"); |
| 3075 | #endif /* IDETAPE_DEBUG_LOG */ |
| 3076 | |
| 3077 | idetape_create_rewind_cmd(drive, &pc); |
| 3078 | retval = idetape_queue_pc_tail(drive, &pc); |
| 3079 | if (retval) |
| 3080 | return retval; |
| 3081 | |
| 3082 | idetape_create_read_position_cmd(&pc); |
| 3083 | retval = idetape_queue_pc_tail(drive, &pc); |
| 3084 | if (retval) |
| 3085 | return retval; |
| 3086 | return 0; |
| 3087 | } |
| 3088 | |
| 3089 | /* |
| 3090 | * Our special ide-tape ioctl's. |
| 3091 | * |
| 3092 | * Currently there aren't any ioctl's. |
| 3093 | * mtio.h compatible commands should be issued to the character device |
| 3094 | * interface. |
| 3095 | */ |
| 3096 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg) |
| 3097 | { |
| 3098 | idetape_tape_t *tape = drive->driver_data; |
| 3099 | idetape_config_t config; |
| 3100 | void __user *argp = (void __user *)arg; |
| 3101 | |
| 3102 | #if IDETAPE_DEBUG_LOG |
| 3103 | if (tape->debug_level >= 4) |
| 3104 | printk(KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n"); |
| 3105 | #endif /* IDETAPE_DEBUG_LOG */ |
| 3106 | switch (cmd) { |
| 3107 | case 0x0340: |
| 3108 | if (copy_from_user(&config, argp, sizeof (idetape_config_t))) |
| 3109 | return -EFAULT; |
| 3110 | tape->best_dsc_rw_frequency = config.dsc_rw_frequency; |
| 3111 | tape->max_stages = config.nr_stages; |
| 3112 | break; |
| 3113 | case 0x0350: |
| 3114 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency; |
| 3115 | config.nr_stages = tape->max_stages; |
| 3116 | if (copy_to_user(argp, &config, sizeof (idetape_config_t))) |
| 3117 | return -EFAULT; |
| 3118 | break; |
| 3119 | default: |
| 3120 | return -EIO; |
| 3121 | } |
| 3122 | return 0; |
| 3123 | } |
| 3124 | |
| 3125 | /* |
| 3126 | * idetape_space_over_filemarks is now a bit more complicated than just |
| 3127 | * passing the command to the tape since we may have crossed some |
| 3128 | * filemarks during our pipelined read-ahead mode. |
| 3129 | * |
| 3130 | * As a minor side effect, the pipeline enables us to support MTFSFM when |
| 3131 | * the filemark is in our internal pipeline even if the tape doesn't |
| 3132 | * support spacing over filemarks in the reverse direction. |
| 3133 | */ |
| 3134 | static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count) |
| 3135 | { |
| 3136 | idetape_tape_t *tape = drive->driver_data; |
| 3137 | idetape_pc_t pc; |
| 3138 | unsigned long flags; |
| 3139 | int retval,count=0; |
| 3140 | |
| 3141 | if (mt_count == 0) |
| 3142 | return 0; |
| 3143 | if (MTBSF == mt_op || MTBSFM == mt_op) { |
| 3144 | if (!tape->capabilities.sprev) |
| 3145 | return -EIO; |
| 3146 | mt_count = - mt_count; |
| 3147 | } |
| 3148 | |
| 3149 | if (tape->chrdev_direction == idetape_direction_read) { |
| 3150 | /* |
| 3151 | * We have a read-ahead buffer. Scan it for crossed |
| 3152 | * filemarks. |
| 3153 | */ |
| 3154 | tape->merge_stage_size = 0; |
| 3155 | if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) |
| 3156 | ++count; |
| 3157 | while (tape->first_stage != NULL) { |
| 3158 | if (count == mt_count) { |
| 3159 | if (mt_op == MTFSFM) |
| 3160 | set_bit(IDETAPE_FILEMARK, &tape->flags); |
| 3161 | return 0; |
| 3162 | } |
| 3163 | spin_lock_irqsave(&tape->spinlock, flags); |
| 3164 | if (tape->first_stage == tape->active_stage) { |
| 3165 | /* |
| 3166 | * We have reached the active stage in the read pipeline. |
| 3167 | * There is no point in allowing the drive to continue |
| 3168 | * reading any farther, so we stop the pipeline. |
| 3169 | * |
| 3170 | * This section should be moved to a separate subroutine, |
| 3171 | * because a similar function is performed in |
| 3172 | * __idetape_discard_read_pipeline(), for example. |
| 3173 | */ |
| 3174 | tape->next_stage = NULL; |
| 3175 | spin_unlock_irqrestore(&tape->spinlock, flags); |
| 3176 | idetape_wait_first_stage(drive); |
| 3177 | tape->next_stage = tape->first_stage->next; |
| 3178 | } else |
| 3179 | spin_unlock_irqrestore(&tape->spinlock, flags); |
| 3180 | if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK) |
| 3181 | ++count; |
| 3182 | idetape_remove_stage_head(drive); |
| 3183 | } |
| 3184 | idetape_discard_read_pipeline(drive, 0); |
| 3185 | } |
| 3186 | |
| 3187 | /* |
| 3188 | * The filemark was not found in our internal pipeline. |
| 3189 | * Now we can issue the space command. |
| 3190 | */ |
| 3191 | switch (mt_op) { |
| 3192 | case MTFSF: |
| 3193 | case MTBSF: |
| 3194 | idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK); |
| 3195 | return (idetape_queue_pc_tail(drive, &pc)); |
| 3196 | case MTFSFM: |
| 3197 | case MTBSFM: |
| 3198 | if (!tape->capabilities.sprev) |
| 3199 | return (-EIO); |
| 3200 | retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count); |
| 3201 | if (retval) return (retval); |
| 3202 | count = (MTBSFM == mt_op ? 1 : -1); |
| 3203 | return (idetape_space_over_filemarks(drive, MTFSF, count)); |
| 3204 | default: |
| 3205 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op); |
| 3206 | return (-EIO); |
| 3207 | } |
| 3208 | } |
| 3209 | |
| 3210 | |
| 3211 | /* |
| 3212 | * Our character device read / write functions. |
| 3213 | * |
| 3214 | * The tape is optimized to maximize throughput when it is transferring |
| 3215 | * an integral number of the "continuous transfer limit", which is |
| 3216 | * a parameter of the specific tape (26 KB on my particular tape). |
| 3217 | * (32 kB for Onstream) |
| 3218 | * |
| 3219 | * As of version 1.3 of the driver, the character device provides an |
| 3220 | * abstract continuous view of the media - any mix of block sizes (even 1 |
| 3221 | * byte) on the same backup/restore procedure is supported. The driver |
| 3222 | * will internally convert the requests to the recommended transfer unit, |
| 3223 | * so that an unmatch between the user's block size to the recommended |
| 3224 | * size will only result in a (slightly) increased driver overhead, but |
| 3225 | * will no longer hit performance. |
| 3226 | * This is not applicable to Onstream. |
| 3227 | */ |
| 3228 | static ssize_t idetape_chrdev_read (struct file *file, char __user *buf, |
| 3229 | size_t count, loff_t *ppos) |
| 3230 | { |
| 3231 | struct ide_tape_obj *tape = ide_tape_f(file); |
| 3232 | ide_drive_t *drive = tape->drive; |
| 3233 | ssize_t bytes_read,temp, actually_read = 0, rc; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 3234 | ssize_t ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3235 | |
| 3236 | #if IDETAPE_DEBUG_LOG |
| 3237 | if (tape->debug_level >= 3) |
| 3238 | printk(KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count); |
| 3239 | #endif /* IDETAPE_DEBUG_LOG */ |
| 3240 | |
| 3241 | if (tape->chrdev_direction != idetape_direction_read) { |
| 3242 | if (test_bit(IDETAPE_DETECT_BS, &tape->flags)) |
| 3243 | if (count > tape->tape_block_size && |
| 3244 | (count % tape->tape_block_size) == 0) |
| 3245 | tape->user_bs_factor = count / tape->tape_block_size; |
| 3246 | } |
| 3247 | if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0) |
| 3248 | return rc; |
| 3249 | if (count == 0) |
| 3250 | return (0); |
| 3251 | if (tape->merge_stage_size) { |
| 3252 | actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 3253 | if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read)) |
| 3254 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3255 | buf += actually_read; |
| 3256 | tape->merge_stage_size -= actually_read; |
| 3257 | count -= actually_read; |
| 3258 | } |
| 3259 | while (count >= tape->stage_size) { |
| 3260 | bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl); |
| 3261 | if (bytes_read <= 0) |
| 3262 | goto finish; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 3263 | if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read)) |
| 3264 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3265 | buf += bytes_read; |
| 3266 | count -= bytes_read; |
| 3267 | actually_read += bytes_read; |
| 3268 | } |
| 3269 | if (count) { |
| 3270 | bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl); |
| 3271 | if (bytes_read <= 0) |
| 3272 | goto finish; |
| 3273 | temp = min((unsigned long)count, (unsigned long)bytes_read); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 3274 | if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp)) |
| 3275 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3276 | actually_read += temp; |
| 3277 | tape->merge_stage_size = bytes_read-temp; |
| 3278 | } |
| 3279 | finish: |
| 3280 | if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) { |
| 3281 | #if IDETAPE_DEBUG_LOG |
| 3282 | if (tape->debug_level >= 2) |
| 3283 | printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name); |
| 3284 | #endif |
| 3285 | idetape_space_over_filemarks(drive, MTFSF, 1); |
| 3286 | return 0; |
| 3287 | } |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 3288 | |
| 3289 | return (ret) ? ret : actually_read; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3290 | } |
| 3291 | |
| 3292 | static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf, |
| 3293 | size_t count, loff_t *ppos) |
| 3294 | { |
| 3295 | struct ide_tape_obj *tape = ide_tape_f(file); |
| 3296 | ide_drive_t *drive = tape->drive; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 3297 | ssize_t actually_written = 0; |
| 3298 | ssize_t ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3299 | |
| 3300 | /* The drive is write protected. */ |
| 3301 | if (tape->write_prot) |
| 3302 | return -EACCES; |
| 3303 | |
| 3304 | #if IDETAPE_DEBUG_LOG |
| 3305 | if (tape->debug_level >= 3) |
| 3306 | printk(KERN_INFO "ide-tape: Reached idetape_chrdev_write, " |
| 3307 | "count %Zd\n", count); |
| 3308 | #endif /* IDETAPE_DEBUG_LOG */ |
| 3309 | |
| 3310 | /* Initialize write operation */ |
| 3311 | if (tape->chrdev_direction != idetape_direction_write) { |
| 3312 | if (tape->chrdev_direction == idetape_direction_read) |
| 3313 | idetape_discard_read_pipeline(drive, 1); |
| 3314 | #if IDETAPE_DEBUG_BUGS |
| 3315 | if (tape->merge_stage || tape->merge_stage_size) { |
| 3316 | printk(KERN_ERR "ide-tape: merge_stage_size " |
| 3317 | "should be 0 now\n"); |
| 3318 | tape->merge_stage_size = 0; |
| 3319 | } |
| 3320 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 3321 | if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) |
| 3322 | return -ENOMEM; |
| 3323 | tape->chrdev_direction = idetape_direction_write; |
| 3324 | idetape_init_merge_stage(tape); |
| 3325 | |
| 3326 | /* |
| 3327 | * Issue a write 0 command to ensure that DSC handshake |
| 3328 | * is switched from completion mode to buffer available |
| 3329 | * mode. |
| 3330 | * No point in issuing this if DSC overlap isn't supported, |
| 3331 | * some drives (Seagate STT3401A) will return an error. |
| 3332 | */ |
| 3333 | if (drive->dsc_overlap) { |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 3334 | ssize_t retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3335 | if (retval < 0) { |
| 3336 | __idetape_kfree_stage(tape->merge_stage); |
| 3337 | tape->merge_stage = NULL; |
| 3338 | tape->chrdev_direction = idetape_direction_none; |
| 3339 | return retval; |
| 3340 | } |
| 3341 | } |
| 3342 | } |
| 3343 | if (count == 0) |
| 3344 | return (0); |
| 3345 | if (tape->restart_speed_control_req) |
| 3346 | idetape_restart_speed_control(drive); |
| 3347 | if (tape->merge_stage_size) { |
| 3348 | #if IDETAPE_DEBUG_BUGS |
| 3349 | if (tape->merge_stage_size >= tape->stage_size) { |
| 3350 | printk(KERN_ERR "ide-tape: bug: merge buffer too big\n"); |
| 3351 | tape->merge_stage_size = 0; |
| 3352 | } |
| 3353 | #endif /* IDETAPE_DEBUG_BUGS */ |
| 3354 | actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count); |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 3355 | if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written)) |
| 3356 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3357 | buf += actually_written; |
| 3358 | tape->merge_stage_size += actually_written; |
| 3359 | count -= actually_written; |
| 3360 | |
| 3361 | if (tape->merge_stage_size == tape->stage_size) { |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 3362 | ssize_t retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3363 | tape->merge_stage_size = 0; |
| 3364 | retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl); |
| 3365 | if (retval <= 0) |
| 3366 | return (retval); |
| 3367 | } |
| 3368 | } |
| 3369 | while (count >= tape->stage_size) { |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 3370 | ssize_t retval; |
| 3371 | if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size)) |
| 3372 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3373 | buf += tape->stage_size; |
| 3374 | count -= tape->stage_size; |
| 3375 | retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl); |
| 3376 | actually_written += tape->stage_size; |
| 3377 | if (retval <= 0) |
| 3378 | return (retval); |
| 3379 | } |
| 3380 | if (count) { |
| 3381 | actually_written += count; |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 3382 | if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count)) |
| 3383 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3384 | tape->merge_stage_size += count; |
| 3385 | } |
Daniel Walker | dcd9637 | 2006-06-25 05:47:37 -0700 | [diff] [blame] | 3386 | return (ret) ? ret : actually_written; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3387 | } |
| 3388 | |
| 3389 | static int idetape_write_filemark (ide_drive_t *drive) |
| 3390 | { |
| 3391 | idetape_pc_t pc; |
| 3392 | |
| 3393 | /* Write a filemark */ |
| 3394 | idetape_create_write_filemark_cmd(drive, &pc, 1); |
| 3395 | if (idetape_queue_pc_tail(drive, &pc)) { |
| 3396 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); |
| 3397 | return -EIO; |
| 3398 | } |
| 3399 | return 0; |
| 3400 | } |
| 3401 | |
| 3402 | /* |
| 3403 | * idetape_mtioctop is called from idetape_chrdev_ioctl when |
| 3404 | * the general mtio MTIOCTOP ioctl is requested. |
| 3405 | * |
| 3406 | * We currently support the following mtio.h operations: |
| 3407 | * |
| 3408 | * MTFSF - Space over mt_count filemarks in the positive direction. |
| 3409 | * The tape is positioned after the last spaced filemark. |
| 3410 | * |
| 3411 | * MTFSFM - Same as MTFSF, but the tape is positioned before the |
| 3412 | * last filemark. |
| 3413 | * |
| 3414 | * MTBSF - Steps background over mt_count filemarks, tape is |
| 3415 | * positioned before the last filemark. |
| 3416 | * |
| 3417 | * MTBSFM - Like MTBSF, only tape is positioned after the last filemark. |
| 3418 | * |
| 3419 | * Note: |
| 3420 | * |
| 3421 | * MTBSF and MTBSFM are not supported when the tape doesn't |
| 3422 | * support spacing over filemarks in the reverse direction. |
| 3423 | * In this case, MTFSFM is also usually not supported (it is |
| 3424 | * supported in the rare case in which we crossed the filemark |
| 3425 | * during our read-ahead pipelined operation mode). |
| 3426 | * |
| 3427 | * MTWEOF - Writes mt_count filemarks. Tape is positioned after |
| 3428 | * the last written filemark. |
| 3429 | * |
| 3430 | * MTREW - Rewinds tape. |
| 3431 | * |
| 3432 | * MTLOAD - Loads the tape. |
| 3433 | * |
| 3434 | * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and |
| 3435 | * MTUNLOAD prevents further access until the media is replaced. |
| 3436 | * |
| 3437 | * MTNOP - Flushes tape buffers. |
| 3438 | * |
| 3439 | * MTRETEN - Retension media. This typically consists of one end |
| 3440 | * to end pass on the media. |
| 3441 | * |
| 3442 | * MTEOM - Moves to the end of recorded data. |
| 3443 | * |
| 3444 | * MTERASE - Erases tape. |
| 3445 | * |
| 3446 | * MTSETBLK - Sets the user block size to mt_count bytes. If |
| 3447 | * mt_count is 0, we will attempt to autodetect |
| 3448 | * the block size. |
| 3449 | * |
| 3450 | * MTSEEK - Positions the tape in a specific block number, where |
| 3451 | * each block is assumed to contain which user_block_size |
| 3452 | * bytes. |
| 3453 | * |
| 3454 | * MTSETPART - Switches to another tape partition. |
| 3455 | * |
| 3456 | * MTLOCK - Locks the tape door. |
| 3457 | * |
| 3458 | * MTUNLOCK - Unlocks the tape door. |
| 3459 | * |
| 3460 | * The following commands are currently not supported: |
| 3461 | * |
| 3462 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, |
| 3463 | * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD. |
| 3464 | */ |
| 3465 | static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count) |
| 3466 | { |
| 3467 | idetape_tape_t *tape = drive->driver_data; |
| 3468 | idetape_pc_t pc; |
| 3469 | int i,retval; |
| 3470 | |
| 3471 | #if IDETAPE_DEBUG_LOG |
| 3472 | if (tape->debug_level >= 1) |
| 3473 | printk(KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: " |
| 3474 | "mt_op=%d, mt_count=%d\n", mt_op, mt_count); |
| 3475 | #endif /* IDETAPE_DEBUG_LOG */ |
| 3476 | /* |
| 3477 | * Commands which need our pipelined read-ahead stages. |
| 3478 | */ |
| 3479 | switch (mt_op) { |
| 3480 | case MTFSF: |
| 3481 | case MTFSFM: |
| 3482 | case MTBSF: |
| 3483 | case MTBSFM: |
| 3484 | if (!mt_count) |
| 3485 | return (0); |
| 3486 | return (idetape_space_over_filemarks(drive,mt_op,mt_count)); |
| 3487 | default: |
| 3488 | break; |
| 3489 | } |
| 3490 | switch (mt_op) { |
| 3491 | case MTWEOF: |
| 3492 | if (tape->write_prot) |
| 3493 | return -EACCES; |
| 3494 | idetape_discard_read_pipeline(drive, 1); |
| 3495 | for (i = 0; i < mt_count; i++) { |
| 3496 | retval = idetape_write_filemark(drive); |
| 3497 | if (retval) |
| 3498 | return retval; |
| 3499 | } |
| 3500 | return (0); |
| 3501 | case MTREW: |
| 3502 | idetape_discard_read_pipeline(drive, 0); |
| 3503 | if (idetape_rewind_tape(drive)) |
| 3504 | return -EIO; |
| 3505 | return 0; |
| 3506 | case MTLOAD: |
| 3507 | idetape_discard_read_pipeline(drive, 0); |
| 3508 | idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); |
| 3509 | return (idetape_queue_pc_tail(drive, &pc)); |
| 3510 | case MTUNLOAD: |
| 3511 | case MTOFFL: |
| 3512 | /* |
| 3513 | * If door is locked, attempt to unlock before |
| 3514 | * attempting to eject. |
| 3515 | */ |
| 3516 | if (tape->door_locked) { |
| 3517 | if (idetape_create_prevent_cmd(drive, &pc, 0)) |
| 3518 | if (!idetape_queue_pc_tail(drive, &pc)) |
| 3519 | tape->door_locked = DOOR_UNLOCKED; |
| 3520 | } |
| 3521 | idetape_discard_read_pipeline(drive, 0); |
| 3522 | idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK); |
| 3523 | retval = idetape_queue_pc_tail(drive, &pc); |
| 3524 | if (!retval) |
| 3525 | clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); |
| 3526 | return retval; |
| 3527 | case MTNOP: |
| 3528 | idetape_discard_read_pipeline(drive, 0); |
| 3529 | return (idetape_flush_tape_buffers(drive)); |
| 3530 | case MTRETEN: |
| 3531 | idetape_discard_read_pipeline(drive, 0); |
| 3532 | idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); |
| 3533 | return (idetape_queue_pc_tail(drive, &pc)); |
| 3534 | case MTEOM: |
| 3535 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); |
| 3536 | return (idetape_queue_pc_tail(drive, &pc)); |
| 3537 | case MTERASE: |
| 3538 | (void) idetape_rewind_tape(drive); |
| 3539 | idetape_create_erase_cmd(&pc); |
| 3540 | return (idetape_queue_pc_tail(drive, &pc)); |
| 3541 | case MTSETBLK: |
| 3542 | if (mt_count) { |
| 3543 | if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size) |
| 3544 | return -EIO; |
| 3545 | tape->user_bs_factor = mt_count / tape->tape_block_size; |
| 3546 | clear_bit(IDETAPE_DETECT_BS, &tape->flags); |
| 3547 | } else |
| 3548 | set_bit(IDETAPE_DETECT_BS, &tape->flags); |
| 3549 | return 0; |
| 3550 | case MTSEEK: |
| 3551 | idetape_discard_read_pipeline(drive, 0); |
| 3552 | return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0); |
| 3553 | case MTSETPART: |
| 3554 | idetape_discard_read_pipeline(drive, 0); |
| 3555 | return (idetape_position_tape(drive, 0, mt_count, 0)); |
| 3556 | case MTFSR: |
| 3557 | case MTBSR: |
| 3558 | case MTLOCK: |
| 3559 | if (!idetape_create_prevent_cmd(drive, &pc, 1)) |
| 3560 | return 0; |
| 3561 | retval = idetape_queue_pc_tail(drive, &pc); |
| 3562 | if (retval) return retval; |
| 3563 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
| 3564 | return 0; |
| 3565 | case MTUNLOCK: |
| 3566 | if (!idetape_create_prevent_cmd(drive, &pc, 0)) |
| 3567 | return 0; |
| 3568 | retval = idetape_queue_pc_tail(drive, &pc); |
| 3569 | if (retval) return retval; |
| 3570 | tape->door_locked = DOOR_UNLOCKED; |
| 3571 | return 0; |
| 3572 | default: |
| 3573 | printk(KERN_ERR "ide-tape: MTIO operation %d not " |
| 3574 | "supported\n", mt_op); |
| 3575 | return (-EIO); |
| 3576 | } |
| 3577 | } |
| 3578 | |
| 3579 | /* |
| 3580 | * Our character device ioctls. |
| 3581 | * |
| 3582 | * General mtio.h magnetic io commands are supported here, and not in |
| 3583 | * the corresponding block interface. |
| 3584 | * |
| 3585 | * The following ioctls are supported: |
| 3586 | * |
| 3587 | * MTIOCTOP - Refer to idetape_mtioctop for detailed description. |
| 3588 | * |
| 3589 | * MTIOCGET - The mt_dsreg field in the returned mtget structure |
| 3590 | * will be set to (user block size in bytes << |
| 3591 | * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK. |
| 3592 | * |
| 3593 | * The mt_blkno is set to the current user block number. |
| 3594 | * The other mtget fields are not supported. |
| 3595 | * |
| 3596 | * MTIOCPOS - The current tape "block position" is returned. We |
| 3597 | * assume that each block contains user_block_size |
| 3598 | * bytes. |
| 3599 | * |
| 3600 | * Our own ide-tape ioctls are supported on both interfaces. |
| 3601 | */ |
| 3602 | static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) |
| 3603 | { |
| 3604 | struct ide_tape_obj *tape = ide_tape_f(file); |
| 3605 | ide_drive_t *drive = tape->drive; |
| 3606 | struct mtop mtop; |
| 3607 | struct mtget mtget; |
| 3608 | struct mtpos mtpos; |
| 3609 | int block_offset = 0, position = tape->first_frame_position; |
| 3610 | void __user *argp = (void __user *)arg; |
| 3611 | |
| 3612 | #if IDETAPE_DEBUG_LOG |
| 3613 | if (tape->debug_level >= 3) |
| 3614 | printk(KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, " |
| 3615 | "cmd=%u\n", cmd); |
| 3616 | #endif /* IDETAPE_DEBUG_LOG */ |
| 3617 | |
| 3618 | tape->restart_speed_control_req = 1; |
| 3619 | if (tape->chrdev_direction == idetape_direction_write) { |
| 3620 | idetape_empty_write_pipeline(drive); |
| 3621 | idetape_flush_tape_buffers(drive); |
| 3622 | } |
| 3623 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { |
| 3624 | block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor); |
| 3625 | if ((position = idetape_read_position(drive)) < 0) |
| 3626 | return -EIO; |
| 3627 | } |
| 3628 | switch (cmd) { |
| 3629 | case MTIOCTOP: |
| 3630 | if (copy_from_user(&mtop, argp, sizeof (struct mtop))) |
| 3631 | return -EFAULT; |
| 3632 | return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count)); |
| 3633 | case MTIOCGET: |
| 3634 | memset(&mtget, 0, sizeof (struct mtget)); |
| 3635 | mtget.mt_type = MT_ISSCSI2; |
| 3636 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; |
| 3637 | mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; |
| 3638 | if (tape->drv_write_prot) { |
| 3639 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); |
| 3640 | } |
| 3641 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) |
| 3642 | return -EFAULT; |
| 3643 | return 0; |
| 3644 | case MTIOCPOS: |
| 3645 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; |
| 3646 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) |
| 3647 | return -EFAULT; |
| 3648 | return 0; |
| 3649 | default: |
| 3650 | if (tape->chrdev_direction == idetape_direction_read) |
| 3651 | idetape_discard_read_pipeline(drive, 1); |
| 3652 | return idetape_blkdev_ioctl(drive, cmd, arg); |
| 3653 | } |
| 3654 | } |
| 3655 | |
| 3656 | static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive); |
| 3657 | |
| 3658 | /* |
| 3659 | * Our character device open function. |
| 3660 | */ |
| 3661 | static int idetape_chrdev_open (struct inode *inode, struct file *filp) |
| 3662 | { |
| 3663 | unsigned int minor = iminor(inode), i = minor & ~0xc0; |
| 3664 | ide_drive_t *drive; |
| 3665 | idetape_tape_t *tape; |
| 3666 | idetape_pc_t pc; |
| 3667 | int retval; |
| 3668 | |
| 3669 | /* |
| 3670 | * We really want to do nonseekable_open(inode, filp); here, but some |
| 3671 | * versions of tar incorrectly call lseek on tapes and bail out if that |
| 3672 | * fails. So we disallow pread() and pwrite(), but permit lseeks. |
| 3673 | */ |
| 3674 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); |
| 3675 | |
| 3676 | #if IDETAPE_DEBUG_LOG |
| 3677 | printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n"); |
| 3678 | #endif /* IDETAPE_DEBUG_LOG */ |
| 3679 | |
| 3680 | if (i >= MAX_HWIFS * MAX_DRIVES) |
| 3681 | return -ENXIO; |
| 3682 | |
| 3683 | if (!(tape = ide_tape_chrdev_get(i))) |
| 3684 | return -ENXIO; |
| 3685 | |
| 3686 | drive = tape->drive; |
| 3687 | |
| 3688 | filp->private_data = tape; |
| 3689 | |
| 3690 | if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) { |
| 3691 | retval = -EBUSY; |
| 3692 | goto out_put_tape; |
| 3693 | } |
| 3694 | |
| 3695 | retval = idetape_wait_ready(drive, 60 * HZ); |
| 3696 | if (retval) { |
| 3697 | clear_bit(IDETAPE_BUSY, &tape->flags); |
| 3698 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
| 3699 | goto out_put_tape; |
| 3700 | } |
| 3701 | |
| 3702 | idetape_read_position(drive); |
| 3703 | if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags)) |
| 3704 | (void)idetape_rewind_tape(drive); |
| 3705 | |
| 3706 | if (tape->chrdev_direction != idetape_direction_read) |
| 3707 | clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); |
| 3708 | |
| 3709 | /* Read block size and write protect status from drive. */ |
| 3710 | idetape_get_blocksize_from_block_descriptor(drive); |
| 3711 | |
| 3712 | /* Set write protect flag if device is opened as read-only. */ |
| 3713 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) |
| 3714 | tape->write_prot = 1; |
| 3715 | else |
| 3716 | tape->write_prot = tape->drv_write_prot; |
| 3717 | |
| 3718 | /* Make sure drive isn't write protected if user wants to write. */ |
| 3719 | if (tape->write_prot) { |
| 3720 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || |
| 3721 | (filp->f_flags & O_ACCMODE) == O_RDWR) { |
| 3722 | clear_bit(IDETAPE_BUSY, &tape->flags); |
| 3723 | retval = -EROFS; |
| 3724 | goto out_put_tape; |
| 3725 | } |
| 3726 | } |
| 3727 | |
| 3728 | /* |
| 3729 | * Lock the tape drive door so user can't eject. |
| 3730 | */ |
| 3731 | if (tape->chrdev_direction == idetape_direction_none) { |
| 3732 | if (idetape_create_prevent_cmd(drive, &pc, 1)) { |
| 3733 | if (!idetape_queue_pc_tail(drive, &pc)) { |
| 3734 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) |
| 3735 | tape->door_locked = DOOR_LOCKED; |
| 3736 | } |
| 3737 | } |
| 3738 | } |
| 3739 | idetape_restart_speed_control(drive); |
| 3740 | tape->restart_speed_control_req = 0; |
| 3741 | return 0; |
| 3742 | |
| 3743 | out_put_tape: |
| 3744 | ide_tape_put(tape); |
| 3745 | return retval; |
| 3746 | } |
| 3747 | |
| 3748 | static void idetape_write_release (ide_drive_t *drive, unsigned int minor) |
| 3749 | { |
| 3750 | idetape_tape_t *tape = drive->driver_data; |
| 3751 | |
| 3752 | idetape_empty_write_pipeline(drive); |
| 3753 | tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0); |
| 3754 | if (tape->merge_stage != NULL) { |
| 3755 | idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1)); |
| 3756 | __idetape_kfree_stage(tape->merge_stage); |
| 3757 | tape->merge_stage = NULL; |
| 3758 | } |
| 3759 | idetape_write_filemark(drive); |
| 3760 | idetape_flush_tape_buffers(drive); |
| 3761 | idetape_flush_tape_buffers(drive); |
| 3762 | } |
| 3763 | |
| 3764 | /* |
| 3765 | * Our character device release function. |
| 3766 | */ |
| 3767 | static int idetape_chrdev_release (struct inode *inode, struct file *filp) |
| 3768 | { |
| 3769 | struct ide_tape_obj *tape = ide_tape_f(filp); |
| 3770 | ide_drive_t *drive = tape->drive; |
| 3771 | idetape_pc_t pc; |
| 3772 | unsigned int minor = iminor(inode); |
| 3773 | |
| 3774 | lock_kernel(); |
| 3775 | tape = drive->driver_data; |
| 3776 | #if IDETAPE_DEBUG_LOG |
| 3777 | if (tape->debug_level >= 3) |
| 3778 | printk(KERN_INFO "ide-tape: Reached idetape_chrdev_release\n"); |
| 3779 | #endif /* IDETAPE_DEBUG_LOG */ |
| 3780 | |
| 3781 | if (tape->chrdev_direction == idetape_direction_write) |
| 3782 | idetape_write_release(drive, minor); |
| 3783 | if (tape->chrdev_direction == idetape_direction_read) { |
| 3784 | if (minor < 128) |
| 3785 | idetape_discard_read_pipeline(drive, 1); |
| 3786 | else |
| 3787 | idetape_wait_for_pipeline(drive); |
| 3788 | } |
| 3789 | if (tape->cache_stage != NULL) { |
| 3790 | __idetape_kfree_stage(tape->cache_stage); |
| 3791 | tape->cache_stage = NULL; |
| 3792 | } |
| 3793 | if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags)) |
| 3794 | (void) idetape_rewind_tape(drive); |
| 3795 | if (tape->chrdev_direction == idetape_direction_none) { |
| 3796 | if (tape->door_locked == DOOR_LOCKED) { |
| 3797 | if (idetape_create_prevent_cmd(drive, &pc, 0)) { |
| 3798 | if (!idetape_queue_pc_tail(drive, &pc)) |
| 3799 | tape->door_locked = DOOR_UNLOCKED; |
| 3800 | } |
| 3801 | } |
| 3802 | } |
| 3803 | clear_bit(IDETAPE_BUSY, &tape->flags); |
| 3804 | ide_tape_put(tape); |
| 3805 | unlock_kernel(); |
| 3806 | return 0; |
| 3807 | } |
| 3808 | |
| 3809 | /* |
| 3810 | * idetape_identify_device is called to check the contents of the |
| 3811 | * ATAPI IDENTIFY command results. We return: |
| 3812 | * |
| 3813 | * 1 If the tape can be supported by us, based on the information |
| 3814 | * we have so far. |
| 3815 | * |
| 3816 | * 0 If this tape driver is not currently supported by us. |
| 3817 | */ |
| 3818 | static int idetape_identify_device (ide_drive_t *drive) |
| 3819 | { |
| 3820 | struct idetape_id_gcw gcw; |
| 3821 | struct hd_driveid *id = drive->id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3822 | |
| 3823 | if (drive->id_read == 0) |
| 3824 | return 1; |
| 3825 | |
| 3826 | *((unsigned short *) &gcw) = id->config; |
| 3827 | |
| 3828 | #if IDETAPE_DEBUG_INFO |
| 3829 | printk(KERN_INFO "ide-tape: Dumping ATAPI Identify Device tape parameters\n"); |
| 3830 | printk(KERN_INFO "ide-tape: Protocol Type: "); |
| 3831 | switch (gcw.protocol) { |
| 3832 | case 0: case 1: printk("ATA\n");break; |
| 3833 | case 2: printk("ATAPI\n");break; |
| 3834 | case 3: printk("Reserved (Unknown to ide-tape)\n");break; |
| 3835 | } |
| 3836 | printk(KERN_INFO "ide-tape: Device Type: %x - ",gcw.device_type); |
| 3837 | switch (gcw.device_type) { |
| 3838 | case 0: printk("Direct-access Device\n");break; |
| 3839 | case 1: printk("Streaming Tape Device\n");break; |
| 3840 | case 2: case 3: case 4: printk("Reserved\n");break; |
| 3841 | case 5: printk("CD-ROM Device\n");break; |
| 3842 | case 6: printk("Reserved\n"); |
| 3843 | case 7: printk("Optical memory Device\n");break; |
| 3844 | case 0x1f: printk("Unknown or no Device type\n");break; |
| 3845 | default: printk("Reserved\n"); |
| 3846 | } |
| 3847 | printk(KERN_INFO "ide-tape: Removable: %s",gcw.removable ? "Yes\n":"No\n"); |
| 3848 | printk(KERN_INFO "ide-tape: Command Packet DRQ Type: "); |
| 3849 | switch (gcw.drq_type) { |
| 3850 | case 0: printk("Microprocessor DRQ\n");break; |
| 3851 | case 1: printk("Interrupt DRQ\n");break; |
| 3852 | case 2: printk("Accelerated DRQ\n");break; |
| 3853 | case 3: printk("Reserved\n");break; |
| 3854 | } |
| 3855 | printk(KERN_INFO "ide-tape: Command Packet Size: "); |
| 3856 | switch (gcw.packet_size) { |
| 3857 | case 0: printk("12 bytes\n");break; |
| 3858 | case 1: printk("16 bytes\n");break; |
| 3859 | default: printk("Reserved\n");break; |
| 3860 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3861 | #endif /* IDETAPE_DEBUG_INFO */ |
| 3862 | |
| 3863 | /* Check that we can support this device */ |
| 3864 | |
| 3865 | if (gcw.protocol !=2 ) |
| 3866 | printk(KERN_ERR "ide-tape: Protocol is not ATAPI\n"); |
| 3867 | else if (gcw.device_type != 1) |
| 3868 | printk(KERN_ERR "ide-tape: Device type is not set to tape\n"); |
| 3869 | else if (!gcw.removable) |
| 3870 | printk(KERN_ERR "ide-tape: The removable flag is not set\n"); |
| 3871 | else if (gcw.packet_size != 0) { |
| 3872 | printk(KERN_ERR "ide-tape: Packet size is not 12 bytes long\n"); |
| 3873 | if (gcw.packet_size == 1) |
| 3874 | printk(KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n"); |
| 3875 | } else |
| 3876 | return 1; |
| 3877 | return 0; |
| 3878 | } |
| 3879 | |
| 3880 | /* |
| 3881 | * Use INQUIRY to get the firmware revision |
| 3882 | */ |
| 3883 | static void idetape_get_inquiry_results (ide_drive_t *drive) |
| 3884 | { |
| 3885 | char *r; |
| 3886 | idetape_tape_t *tape = drive->driver_data; |
| 3887 | idetape_pc_t pc; |
| 3888 | idetape_inquiry_result_t *inquiry; |
| 3889 | |
| 3890 | idetape_create_inquiry_cmd(&pc); |
| 3891 | if (idetape_queue_pc_tail(drive, &pc)) { |
| 3892 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name); |
| 3893 | return; |
| 3894 | } |
| 3895 | inquiry = (idetape_inquiry_result_t *) pc.buffer; |
| 3896 | memcpy(tape->vendor_id, inquiry->vendor_id, 8); |
| 3897 | memcpy(tape->product_id, inquiry->product_id, 16); |
| 3898 | memcpy(tape->firmware_revision, inquiry->revision_level, 4); |
| 3899 | ide_fixstring(tape->vendor_id, 10, 0); |
| 3900 | ide_fixstring(tape->product_id, 18, 0); |
| 3901 | ide_fixstring(tape->firmware_revision, 6, 0); |
| 3902 | r = tape->firmware_revision; |
| 3903 | if (*(r + 1) == '.') |
| 3904 | tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0'; |
| 3905 | printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", drive->name, tape->name, tape->vendor_id, tape->product_id, tape->firmware_revision); |
| 3906 | } |
| 3907 | |
| 3908 | /* |
| 3909 | * idetape_get_mode_sense_results asks the tape about its various |
| 3910 | * parameters. In particular, we will adjust our data transfer buffer |
| 3911 | * size to the recommended value as returned by the tape. |
| 3912 | */ |
| 3913 | static void idetape_get_mode_sense_results (ide_drive_t *drive) |
| 3914 | { |
| 3915 | idetape_tape_t *tape = drive->driver_data; |
| 3916 | idetape_pc_t pc; |
| 3917 | idetape_mode_parameter_header_t *header; |
| 3918 | idetape_capabilities_page_t *capabilities; |
| 3919 | |
| 3920 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
| 3921 | if (idetape_queue_pc_tail(drive, &pc)) { |
| 3922 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n"); |
| 3923 | tape->tape_block_size = 512; |
| 3924 | tape->capabilities.ctl = 52; |
| 3925 | tape->capabilities.speed = 450; |
| 3926 | tape->capabilities.buffer_size = 6 * 52; |
| 3927 | return; |
| 3928 | } |
| 3929 | header = (idetape_mode_parameter_header_t *) pc.buffer; |
| 3930 | capabilities = (idetape_capabilities_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl); |
| 3931 | |
| 3932 | capabilities->max_speed = ntohs(capabilities->max_speed); |
| 3933 | capabilities->ctl = ntohs(capabilities->ctl); |
| 3934 | capabilities->speed = ntohs(capabilities->speed); |
| 3935 | capabilities->buffer_size = ntohs(capabilities->buffer_size); |
| 3936 | |
| 3937 | if (!capabilities->speed) { |
| 3938 | printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name); |
| 3939 | capabilities->speed = 650; |
| 3940 | } |
| 3941 | if (!capabilities->max_speed) { |
| 3942 | printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name); |
| 3943 | capabilities->max_speed = 650; |
| 3944 | } |
| 3945 | |
| 3946 | tape->capabilities = *capabilities; /* Save us a copy */ |
| 3947 | if (capabilities->blk512) |
| 3948 | tape->tape_block_size = 512; |
| 3949 | else if (capabilities->blk1024) |
| 3950 | tape->tape_block_size = 1024; |
| 3951 | |
| 3952 | #if IDETAPE_DEBUG_INFO |
| 3953 | printk(KERN_INFO "ide-tape: Dumping the results of the MODE SENSE packet command\n"); |
| 3954 | printk(KERN_INFO "ide-tape: Mode Parameter Header:\n"); |
| 3955 | printk(KERN_INFO "ide-tape: Mode Data Length - %d\n",header->mode_data_length); |
| 3956 | printk(KERN_INFO "ide-tape: Medium Type - %d\n",header->medium_type); |
| 3957 | printk(KERN_INFO "ide-tape: Device Specific Parameter - %d\n",header->dsp); |
| 3958 | printk(KERN_INFO "ide-tape: Block Descriptor Length - %d\n",header->bdl); |
| 3959 | |
| 3960 | printk(KERN_INFO "ide-tape: Capabilities and Mechanical Status Page:\n"); |
| 3961 | printk(KERN_INFO "ide-tape: Page code - %d\n",capabilities->page_code); |
| 3962 | printk(KERN_INFO "ide-tape: Page length - %d\n",capabilities->page_length); |
| 3963 | printk(KERN_INFO "ide-tape: Read only - %s\n",capabilities->ro ? "Yes":"No"); |
| 3964 | printk(KERN_INFO "ide-tape: Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No"); |
| 3965 | printk(KERN_INFO "ide-tape: Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No"); |
| 3966 | printk(KERN_INFO "ide-tape: Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No"); |
| 3967 | printk(KERN_INFO "ide-tape: Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No"); |
| 3968 | printk(KERN_INFO "ide-tape: The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No"); |
| 3969 | printk(KERN_INFO "ide-tape: The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No"); |
| 3970 | printk(KERN_INFO "ide-tape: Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No"); |
| 3971 | printk(KERN_INFO "ide-tape: Supports error correction - %s\n",capabilities->ecc ? "Yes":"No"); |
| 3972 | printk(KERN_INFO "ide-tape: Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No"); |
| 3973 | printk(KERN_INFO "ide-tape: Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No"); |
| 3974 | printk(KERN_INFO "ide-tape: Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No"); |
| 3975 | printk(KERN_INFO "ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities->blk32768 ? "Yes":"No"); |
| 3976 | printk(KERN_INFO "ide-tape: Maximum supported speed in KBps - %d\n",capabilities->max_speed); |
| 3977 | printk(KERN_INFO "ide-tape: Continuous transfer limits in blocks - %d\n",capabilities->ctl); |
| 3978 | printk(KERN_INFO "ide-tape: Current speed in KBps - %d\n",capabilities->speed); |
| 3979 | printk(KERN_INFO "ide-tape: Buffer size - %d\n",capabilities->buffer_size*512); |
| 3980 | #endif /* IDETAPE_DEBUG_INFO */ |
| 3981 | } |
| 3982 | |
| 3983 | /* |
| 3984 | * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor |
| 3985 | * and if it succeeds sets the tape block size with the reported value |
| 3986 | */ |
| 3987 | static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive) |
| 3988 | { |
| 3989 | |
| 3990 | idetape_tape_t *tape = drive->driver_data; |
| 3991 | idetape_pc_t pc; |
| 3992 | idetape_mode_parameter_header_t *header; |
| 3993 | idetape_parameter_block_descriptor_t *block_descrp; |
| 3994 | |
| 3995 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); |
| 3996 | if (idetape_queue_pc_tail(drive, &pc)) { |
| 3997 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); |
| 3998 | if (tape->tape_block_size == 0) { |
| 3999 | printk(KERN_WARNING "ide-tape: Cannot deal with zero block size, assume 32k\n"); |
| 4000 | tape->tape_block_size = 32768; |
| 4001 | } |
| 4002 | return; |
| 4003 | } |
| 4004 | header = (idetape_mode_parameter_header_t *) pc.buffer; |
| 4005 | block_descrp = (idetape_parameter_block_descriptor_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t)); |
| 4006 | tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2]; |
| 4007 | tape->drv_write_prot = (header->dsp & 0x80) >> 7; |
| 4008 | |
| 4009 | #if IDETAPE_DEBUG_INFO |
| 4010 | printk(KERN_INFO "ide-tape: Adjusted block size - %d\n", tape->tape_block_size); |
| 4011 | #endif /* IDETAPE_DEBUG_INFO */ |
| 4012 | } |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 4013 | |
| 4014 | #ifdef CONFIG_IDE_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4015 | static void idetape_add_settings (ide_drive_t *drive) |
| 4016 | { |
| 4017 | idetape_tape_t *tape = drive->driver_data; |
| 4018 | |
| 4019 | /* |
Bartlomiej Zolnierkiewicz | 1497943 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 4020 | * drive setting name read/write data type min max mul_factor div_factor data pointer set function |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4021 | */ |
Bartlomiej Zolnierkiewicz | 1497943 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 4022 | ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL); |
| 4023 | ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL); |
| 4024 | ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL); |
| 4025 | ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL); |
| 4026 | ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL); |
| 4027 | ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL); |
| 4028 | ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->capabilities.speed, NULL); |
| 4029 | ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL); |
| 4030 | ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_frequency, NULL); |
| 4031 | ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL); |
| 4032 | ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL); |
| 4033 | ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed,NULL); |
| 4034 | ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL); |
| 4035 | ide_add_setting(drive, "debug_level", SETTING_RW, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4036 | } |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 4037 | #else |
| 4038 | static inline void idetape_add_settings(ide_drive_t *drive) { ; } |
| 4039 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4040 | |
| 4041 | /* |
| 4042 | * ide_setup is called to: |
| 4043 | * |
| 4044 | * 1. Initialize our various state variables. |
| 4045 | * 2. Ask the tape for its capabilities. |
| 4046 | * 3. Allocate a buffer which will be used for data |
| 4047 | * transfer. The buffer size is chosen based on |
| 4048 | * the recommendation which we received in step (2). |
| 4049 | * |
| 4050 | * Note that at this point ide.c already assigned us an irq, so that |
| 4051 | * we can queue requests here and wait for their completion. |
| 4052 | */ |
| 4053 | static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor) |
| 4054 | { |
| 4055 | unsigned long t1, tmid, tn, t; |
| 4056 | int speed; |
| 4057 | struct idetape_id_gcw gcw; |
| 4058 | int stage_size; |
| 4059 | struct sysinfo si; |
| 4060 | |
| 4061 | spin_lock_init(&tape->spinlock); |
| 4062 | drive->dsc_overlap = 1; |
Bartlomiej Zolnierkiewicz | 4166c19 | 2008-02-01 23:09:30 +0100 | [diff] [blame] | 4063 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
| 4064 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", |
| 4065 | tape->name); |
| 4066 | drive->dsc_overlap = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4067 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4068 | /* Seagate Travan drives do not support DSC overlap. */ |
| 4069 | if (strstr(drive->id->model, "Seagate STT3401")) |
| 4070 | drive->dsc_overlap = 0; |
| 4071 | tape->minor = minor; |
| 4072 | tape->name[0] = 'h'; |
| 4073 | tape->name[1] = 't'; |
| 4074 | tape->name[2] = '0' + minor; |
| 4075 | tape->chrdev_direction = idetape_direction_none; |
| 4076 | tape->pc = tape->pc_stack; |
| 4077 | tape->max_insert_speed = 10000; |
| 4078 | tape->speed_control = 1; |
| 4079 | *((unsigned short *) &gcw) = drive->id->config; |
| 4080 | if (gcw.drq_type == 1) |
| 4081 | set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags); |
| 4082 | |
| 4083 | tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10; |
| 4084 | |
| 4085 | idetape_get_inquiry_results(drive); |
| 4086 | idetape_get_mode_sense_results(drive); |
| 4087 | idetape_get_blocksize_from_block_descriptor(drive); |
| 4088 | tape->user_bs_factor = 1; |
| 4089 | tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; |
| 4090 | while (tape->stage_size > 0xffff) { |
| 4091 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
| 4092 | tape->capabilities.ctl /= 2; |
| 4093 | tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; |
| 4094 | } |
| 4095 | stage_size = tape->stage_size; |
| 4096 | tape->pages_per_stage = stage_size / PAGE_SIZE; |
| 4097 | if (stage_size % PAGE_SIZE) { |
| 4098 | tape->pages_per_stage++; |
| 4099 | tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE; |
| 4100 | } |
| 4101 | |
| 4102 | /* |
| 4103 | * Select the "best" DSC read/write polling frequency |
| 4104 | * and pipeline size. |
| 4105 | */ |
| 4106 | speed = max(tape->capabilities.speed, tape->capabilities.max_speed); |
| 4107 | |
| 4108 | tape->max_stages = speed * 1000 * 10 / tape->stage_size; |
| 4109 | |
| 4110 | /* |
| 4111 | * Limit memory use for pipeline to 10% of physical memory |
| 4112 | */ |
| 4113 | si_meminfo(&si); |
| 4114 | if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10) |
| 4115 | tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size); |
| 4116 | tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES); |
| 4117 | tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES); |
| 4118 | tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES); |
| 4119 | if (tape->max_stages == 0) |
| 4120 | tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1; |
| 4121 | |
| 4122 | t1 = (tape->stage_size * HZ) / (speed * 1000); |
| 4123 | tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125); |
| 4124 | tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000); |
| 4125 | |
| 4126 | if (tape->max_stages) |
| 4127 | t = tn; |
| 4128 | else |
| 4129 | t = t1; |
| 4130 | |
| 4131 | /* |
| 4132 | * Ensure that the number we got makes sense; limit |
| 4133 | * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. |
| 4134 | */ |
| 4135 | tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN); |
| 4136 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
| 4137 | "%dkB pipeline, %lums tDSC%s\n", |
| 4138 | drive->name, tape->name, tape->capabilities.speed, |
| 4139 | (tape->capabilities.buffer_size * 512) / tape->stage_size, |
| 4140 | tape->stage_size / 1024, |
| 4141 | tape->max_stages * tape->stage_size / 1024, |
| 4142 | tape->best_dsc_rw_frequency * 1000 / HZ, |
| 4143 | drive->using_dma ? ", DMA":""); |
| 4144 | |
| 4145 | idetape_add_settings(drive); |
| 4146 | } |
| 4147 | |
Russell King | 4031bbe | 2006-01-06 11:41:00 +0000 | [diff] [blame] | 4148 | static void ide_tape_remove(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4149 | { |
| 4150 | idetape_tape_t *tape = drive->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4151 | |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 4152 | ide_proc_unregister_driver(drive, tape->driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4153 | |
| 4154 | ide_unregister_region(tape->disk); |
| 4155 | |
| 4156 | ide_tape_put(tape); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4157 | } |
| 4158 | |
| 4159 | static void ide_tape_release(struct kref *kref) |
| 4160 | { |
| 4161 | struct ide_tape_obj *tape = to_ide_tape(kref); |
| 4162 | ide_drive_t *drive = tape->drive; |
| 4163 | struct gendisk *g = tape->disk; |
| 4164 | |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 4165 | BUG_ON(tape->first_stage != NULL || tape->merge_stage_size); |
| 4166 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4167 | drive->dsc_overlap = 0; |
| 4168 | drive->driver_data = NULL; |
Tony Jones | dbc1272 | 2007-09-25 02:03:03 +0200 | [diff] [blame] | 4169 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
| 4170 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor + 128)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4171 | idetape_devs[tape->minor] = NULL; |
| 4172 | g->private_data = NULL; |
| 4173 | put_disk(g); |
| 4174 | kfree(tape); |
| 4175 | } |
| 4176 | |
Bartlomiej Zolnierkiewicz | ecfd80e | 2007-05-10 00:01:09 +0200 | [diff] [blame] | 4177 | #ifdef CONFIG_IDE_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4178 | static int proc_idetape_read_name |
| 4179 | (char *page, char **start, off_t off, int count, int *eof, void *data) |
| 4180 | { |
| 4181 | ide_drive_t *drive = (ide_drive_t *) data; |
| 4182 | idetape_tape_t *tape = drive->driver_data; |
| 4183 | char *out = page; |
| 4184 | int len; |
| 4185 | |
| 4186 | len = sprintf(out, "%s\n", tape->name); |
| 4187 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); |
| 4188 | } |
| 4189 | |
| 4190 | static ide_proc_entry_t idetape_proc[] = { |
| 4191 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, |
| 4192 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, |
| 4193 | { NULL, 0, NULL, NULL } |
| 4194 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4195 | #endif |
| 4196 | |
Russell King | 4031bbe | 2006-01-06 11:41:00 +0000 | [diff] [blame] | 4197 | static int ide_tape_probe(ide_drive_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4198 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4199 | static ide_driver_t idetape_driver = { |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 4200 | .gen_driver = { |
Laurent Riffard | 4ef3b8f | 2005-11-18 22:15:40 +0100 | [diff] [blame] | 4201 | .owner = THIS_MODULE, |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 4202 | .name = "ide-tape", |
| 4203 | .bus = &ide_bus_type, |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 4204 | }, |
Russell King | 4031bbe | 2006-01-06 11:41:00 +0000 | [diff] [blame] | 4205 | .probe = ide_tape_probe, |
| 4206 | .remove = ide_tape_remove, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4207 | .version = IDETAPE_VERSION, |
| 4208 | .media = ide_tape, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4209 | .supports_dsc_overlap = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4210 | .do_request = idetape_do_request, |
| 4211 | .end_request = idetape_end_request, |
| 4212 | .error = __ide_error, |
| 4213 | .abort = __ide_abort, |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 4214 | #ifdef CONFIG_IDE_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4215 | .proc = idetape_proc, |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 4216 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4217 | }; |
| 4218 | |
| 4219 | /* |
| 4220 | * Our character device supporting functions, passed to register_chrdev. |
| 4221 | */ |
Arjan van de Ven | 2b8693c | 2007-02-12 00:55:32 -0800 | [diff] [blame] | 4222 | static const struct file_operations idetape_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4223 | .owner = THIS_MODULE, |
| 4224 | .read = idetape_chrdev_read, |
| 4225 | .write = idetape_chrdev_write, |
| 4226 | .ioctl = idetape_chrdev_ioctl, |
| 4227 | .open = idetape_chrdev_open, |
| 4228 | .release = idetape_chrdev_release, |
| 4229 | }; |
| 4230 | |
| 4231 | static int idetape_open(struct inode *inode, struct file *filp) |
| 4232 | { |
| 4233 | struct gendisk *disk = inode->i_bdev->bd_disk; |
| 4234 | struct ide_tape_obj *tape; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4235 | |
| 4236 | if (!(tape = ide_tape_get(disk))) |
| 4237 | return -ENXIO; |
| 4238 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4239 | return 0; |
| 4240 | } |
| 4241 | |
| 4242 | static int idetape_release(struct inode *inode, struct file *filp) |
| 4243 | { |
| 4244 | struct gendisk *disk = inode->i_bdev->bd_disk; |
| 4245 | struct ide_tape_obj *tape = ide_tape_g(disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4246 | |
| 4247 | ide_tape_put(tape); |
| 4248 | |
| 4249 | return 0; |
| 4250 | } |
| 4251 | |
| 4252 | static int idetape_ioctl(struct inode *inode, struct file *file, |
| 4253 | unsigned int cmd, unsigned long arg) |
| 4254 | { |
| 4255 | struct block_device *bdev = inode->i_bdev; |
| 4256 | struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); |
| 4257 | ide_drive_t *drive = tape->drive; |
| 4258 | int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); |
| 4259 | if (err == -EINVAL) |
| 4260 | err = idetape_blkdev_ioctl(drive, cmd, arg); |
| 4261 | return err; |
| 4262 | } |
| 4263 | |
| 4264 | static struct block_device_operations idetape_block_ops = { |
| 4265 | .owner = THIS_MODULE, |
| 4266 | .open = idetape_open, |
| 4267 | .release = idetape_release, |
| 4268 | .ioctl = idetape_ioctl, |
| 4269 | }; |
| 4270 | |
Russell King | 4031bbe | 2006-01-06 11:41:00 +0000 | [diff] [blame] | 4271 | static int ide_tape_probe(ide_drive_t *drive) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4272 | { |
| 4273 | idetape_tape_t *tape; |
| 4274 | struct gendisk *g; |
| 4275 | int minor; |
| 4276 | |
| 4277 | if (!strstr("ide-tape", drive->driver_req)) |
| 4278 | goto failed; |
| 4279 | if (!drive->present) |
| 4280 | goto failed; |
| 4281 | if (drive->media != ide_tape) |
| 4282 | goto failed; |
| 4283 | if (!idetape_identify_device (drive)) { |
| 4284 | printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name); |
| 4285 | goto failed; |
| 4286 | } |
| 4287 | if (drive->scsi) { |
| 4288 | printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name); |
| 4289 | goto failed; |
| 4290 | } |
| 4291 | if (strstr(drive->id->model, "OnStream DI-")) { |
| 4292 | printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name); |
| 4293 | printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n"); |
| 4294 | } |
Robert P. J. Day | 5cbded5 | 2006-12-13 00:35:56 -0800 | [diff] [blame] | 4295 | tape = kzalloc(sizeof (idetape_tape_t), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4296 | if (tape == NULL) { |
| 4297 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name); |
| 4298 | goto failed; |
| 4299 | } |
| 4300 | |
| 4301 | g = alloc_disk(1 << PARTN_BITS); |
| 4302 | if (!g) |
| 4303 | goto out_free_tape; |
| 4304 | |
| 4305 | ide_init_disk(g, drive); |
| 4306 | |
Bartlomiej Zolnierkiewicz | 7662d04 | 2007-05-10 00:01:10 +0200 | [diff] [blame] | 4307 | ide_proc_register_driver(drive, &idetape_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4308 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4309 | kref_init(&tape->kref); |
| 4310 | |
| 4311 | tape->drive = drive; |
| 4312 | tape->driver = &idetape_driver; |
| 4313 | tape->disk = g; |
| 4314 | |
| 4315 | g->private_data = &tape->driver; |
| 4316 | |
| 4317 | drive->driver_data = tape; |
| 4318 | |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 4319 | mutex_lock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4320 | for (minor = 0; idetape_devs[minor]; minor++) |
| 4321 | ; |
| 4322 | idetape_devs[minor] = tape; |
Arjan van de Ven | cf8b897 | 2006-03-23 03:00:45 -0800 | [diff] [blame] | 4323 | mutex_unlock(&idetape_ref_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4324 | |
| 4325 | idetape_setup(drive, tape, minor); |
| 4326 | |
Tony Jones | dbc1272 | 2007-09-25 02:03:03 +0200 | [diff] [blame] | 4327 | device_create(idetape_sysfs_class, &drive->gendev, |
| 4328 | MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name); |
| 4329 | device_create(idetape_sysfs_class, &drive->gendev, |
| 4330 | MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name); |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 4331 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4332 | g->fops = &idetape_block_ops; |
| 4333 | ide_register_region(g); |
| 4334 | |
| 4335 | return 0; |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 4336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4337 | out_free_tape: |
| 4338 | kfree(tape); |
| 4339 | failed: |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 4340 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4341 | } |
| 4342 | |
| 4343 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
| 4344 | MODULE_LICENSE("GPL"); |
| 4345 | |
| 4346 | static void __exit idetape_exit (void) |
| 4347 | { |
Bartlomiej Zolnierkiewicz | 8604aff | 2005-05-26 14:55:34 +0200 | [diff] [blame] | 4348 | driver_unregister(&idetape_driver.gen_driver); |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 4349 | class_destroy(idetape_sysfs_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4350 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
| 4351 | } |
| 4352 | |
Bartlomiej Zolnierkiewicz | 17514e8 | 2005-11-19 22:24:35 +0100 | [diff] [blame] | 4353 | static int __init idetape_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4354 | { |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 4355 | int error = 1; |
| 4356 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); |
| 4357 | if (IS_ERR(idetape_sysfs_class)) { |
| 4358 | idetape_sysfs_class = NULL; |
| 4359 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); |
| 4360 | error = -EBUSY; |
| 4361 | goto out; |
| 4362 | } |
| 4363 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4364 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
| 4365 | printk(KERN_ERR "ide-tape: Failed to register character device interface\n"); |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 4366 | error = -EBUSY; |
| 4367 | goto out_free_class; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4368 | } |
Will Dyson | d5dee80 | 2005-09-16 02:55:07 -0700 | [diff] [blame] | 4369 | |
| 4370 | error = driver_register(&idetape_driver.gen_driver); |
| 4371 | if (error) |
| 4372 | goto out_free_driver; |
| 4373 | |
| 4374 | return 0; |
| 4375 | |
| 4376 | out_free_driver: |
| 4377 | driver_unregister(&idetape_driver.gen_driver); |
| 4378 | out_free_class: |
| 4379 | class_destroy(idetape_sysfs_class); |
| 4380 | out: |
| 4381 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4382 | } |
| 4383 | |
Kay Sievers | 263756e | 2005-12-12 18:03:44 +0100 | [diff] [blame] | 4384 | MODULE_ALIAS("ide:*m-tape*"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4385 | module_init(idetape_init); |
| 4386 | module_exit(idetape_exit); |
| 4387 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); |