| /* |
| * IDE ATAPI streaming tape driver. |
| * |
| * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> |
| * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz |
| * |
| * This driver was constructed as a student project in the software laboratory |
| * of the faculty of electrical engineering in the Technion - Israel's |
| * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. |
| * |
| * It is hereby placed under the terms of the GNU general public license. |
| * (See linux/COPYING). |
| * |
| * For a historical changelog see |
| * Documentation/ide/ChangeLog.ide-tape.1995-2002 |
| */ |
| |
| #define IDETAPE_VERSION "1.20" |
| |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/string.h> |
| #include <linux/kernel.h> |
| #include <linux/delay.h> |
| #include <linux/timer.h> |
| #include <linux/mm.h> |
| #include <linux/interrupt.h> |
| #include <linux/jiffies.h> |
| #include <linux/major.h> |
| #include <linux/errno.h> |
| #include <linux/genhd.h> |
| #include <linux/slab.h> |
| #include <linux/pci.h> |
| #include <linux/ide.h> |
| #include <linux/smp_lock.h> |
| #include <linux/completion.h> |
| #include <linux/bitops.h> |
| #include <linux/mutex.h> |
| #include <scsi/scsi.h> |
| |
| #include <asm/byteorder.h> |
| #include <linux/irq.h> |
| #include <linux/uaccess.h> |
| #include <linux/io.h> |
| #include <asm/unaligned.h> |
| #include <linux/mtio.h> |
| |
| enum { |
| /* output errors only */ |
| DBG_ERR = (1 << 0), |
| /* output all sense key/asc */ |
| DBG_SENSE = (1 << 1), |
| /* info regarding all chrdev-related procedures */ |
| DBG_CHRDEV = (1 << 2), |
| /* all remaining procedures */ |
| DBG_PROCS = (1 << 3), |
| /* buffer alloc info (pc_stack & rq_stack) */ |
| DBG_PCRQ_STACK = (1 << 4), |
| }; |
| |
| /* define to see debug info */ |
| #define IDETAPE_DEBUG_LOG 0 |
| |
| #if IDETAPE_DEBUG_LOG |
| #define debug_log(lvl, fmt, args...) \ |
| { \ |
| if (tape->debug_mask & lvl) \ |
| printk(KERN_INFO "ide-tape: " fmt, ## args); \ |
| } |
| #else |
| #define debug_log(lvl, fmt, args...) do {} while (0) |
| #endif |
| |
| /**************************** Tunable parameters *****************************/ |
| /* |
| * After each failed packet command we issue a request sense command and retry |
| * the packet command IDETAPE_MAX_PC_RETRIES times. |
| * |
| * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. |
| */ |
| #define IDETAPE_MAX_PC_RETRIES 3 |
| |
| /* |
| * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE |
| * bytes. This is used for several packet commands (Not for READ/WRITE commands) |
| */ |
| #define IDETAPE_PC_BUFFER_SIZE 256 |
| |
| /* |
| * In various places in the driver, we need to allocate storage |
| * for packet commands and requests, which will remain valid while |
| * we leave the driver to wait for an interrupt or a timeout event. |
| */ |
| #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) |
| |
| /* |
| * Some drives (for example, Seagate STT3401A Travan) require a very long |
| * timeout, because they don't return an interrupt or clear their busy bit |
| * until after the command completes (even retension commands). |
| */ |
| #define IDETAPE_WAIT_CMD (900*HZ) |
| |
| /* |
| * The following parameter is used to select the point in the internal tape fifo |
| * in which we will start to refill the buffer. Decreasing the following |
| * parameter will improve the system's latency and interactive response, while |
| * using a high value might improve system throughput. |
| */ |
| #define IDETAPE_FIFO_THRESHOLD 2 |
| |
| /* |
| * DSC polling parameters. |
| * |
| * Polling for DSC (a single bit in the status register) is a very important |
| * function in ide-tape. There are two cases in which we poll for DSC: |
| * |
| * 1. Before a read/write packet command, to ensure that we can transfer data |
| * from/to the tape's data buffers, without causing an actual media access. |
| * In case the tape is not ready yet, we take out our request from the device |
| * request queue, so that ide.c could service requests from the other device |
| * on the same interface in the meantime. |
| * |
| * 2. After the successful initialization of a "media access packet command", |
| * which is a command that can take a long time to complete (the interval can |
| * range from several seconds to even an hour). Again, we postpone our request |
| * in the middle to free the bus for the other device. The polling frequency |
| * here should be lower than the read/write frequency since those media access |
| * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST |
| * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD |
| * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). |
| * |
| * We also set a timeout for the timer, in case something goes wrong. The |
| * timeout should be longer then the maximum execution time of a tape operation. |
| */ |
| |
| /* DSC timings. */ |
| #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
| #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ |
| #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ |
| #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ |
| #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ |
| #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ |
| #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ |
| |
| /*************************** End of tunable parameters ***********************/ |
| |
| /* Read/Write error simulation */ |
| #define SIMULATE_ERRORS 0 |
| |
| /* tape directions */ |
| enum { |
| IDETAPE_DIR_NONE = (1 << 0), |
| IDETAPE_DIR_READ = (1 << 1), |
| IDETAPE_DIR_WRITE = (1 << 2), |
| }; |
| |
| struct idetape_bh { |
| u32 b_size; |
| atomic_t b_count; |
| struct idetape_bh *b_reqnext; |
| char *b_data; |
| }; |
| |
| /* Tape door status */ |
| #define DOOR_UNLOCKED 0 |
| #define DOOR_LOCKED 1 |
| #define DOOR_EXPLICITLY_LOCKED 2 |
| |
| /* Some defines for the SPACE command */ |
| #define IDETAPE_SPACE_OVER_FILEMARK 1 |
| #define IDETAPE_SPACE_TO_EOD 3 |
| |
| /* Some defines for the LOAD UNLOAD command */ |
| #define IDETAPE_LU_LOAD_MASK 1 |
| #define IDETAPE_LU_RETENSION_MASK 2 |
| #define IDETAPE_LU_EOT_MASK 4 |
| |
| /* |
| * Special requests for our block device strategy routine. |
| * |
| * In order to service a character device command, we add special requests to |
| * the tail of our block device request queue and wait for their completion. |
| */ |
| |
| enum { |
| REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ |
| REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ |
| REQ_IDETAPE_READ = (1 << 2), |
| REQ_IDETAPE_WRITE = (1 << 3), |
| }; |
| |
| /* Error codes returned in rq->errors to the higher part of the driver. */ |
| #define IDETAPE_ERROR_GENERAL 101 |
| #define IDETAPE_ERROR_FILEMARK 102 |
| #define IDETAPE_ERROR_EOD 103 |
| |
| /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ |
| #define IDETAPE_BLOCK_DESCRIPTOR 0 |
| #define IDETAPE_CAPABILITIES_PAGE 0x2a |
| |
| /* Tape flag bits values. */ |
| enum { |
| IDETAPE_FLAG_IGNORE_DSC = (1 << 0), |
| /* 0 When the tape position is unknown */ |
| IDETAPE_FLAG_ADDRESS_VALID = (1 << 1), |
| /* Device already opened */ |
| IDETAPE_FLAG_BUSY = (1 << 2), |
| /* Attempt to auto-detect the current user block size */ |
| IDETAPE_FLAG_DETECT_BS = (1 << 3), |
| /* Currently on a filemark */ |
| IDETAPE_FLAG_FILEMARK = (1 << 4), |
| /* DRQ interrupt device */ |
| IDETAPE_FLAG_DRQ_INTERRUPT = (1 << 5), |
| /* 0 = no tape is loaded, so we don't rewind after ejecting */ |
| IDETAPE_FLAG_MEDIUM_PRESENT = (1 << 6), |
| }; |
| |
| /* A pipeline stage. */ |
| typedef struct idetape_stage_s { |
| struct request rq; /* The corresponding request */ |
| struct idetape_bh *bh; /* The data buffers */ |
| struct idetape_stage_s *next; /* Pointer to the next stage */ |
| } idetape_stage_t; |
| |
| /* |
| * Most of our global data which we need to save even as we leave the driver due |
| * to an interrupt or a timer event is stored in the struct defined below. |
| */ |
| typedef struct ide_tape_obj { |
| ide_drive_t *drive; |
| ide_driver_t *driver; |
| struct gendisk *disk; |
| struct kref kref; |
| |
| /* |
| * Since a typical character device operation requires more |
| * than one packet command, we provide here enough memory |
| * for the maximum of interconnected packet commands. |
| * The packet commands are stored in the circular array pc_stack. |
| * pc_stack_index points to the last used entry, and warps around |
| * to the start when we get to the last array entry. |
| * |
| * pc points to the current processed packet command. |
| * |
| * failed_pc points to the last failed packet command, or contains |
| * NULL if we do not need to retry any packet command. This is |
| * required since an additional packet command is needed before the |
| * retry, to get detailed information on what went wrong. |
| */ |
| /* Current packet command */ |
| struct ide_atapi_pc *pc; |
| /* Last failed packet command */ |
| struct ide_atapi_pc *failed_pc; |
| /* Packet command stack */ |
| struct ide_atapi_pc pc_stack[IDETAPE_PC_STACK]; |
| /* Next free packet command storage space */ |
| int pc_stack_index; |
| struct request rq_stack[IDETAPE_PC_STACK]; |
| /* We implement a circular array */ |
| int rq_stack_index; |
| |
| /* |
| * DSC polling variables. |
| * |
| * While polling for DSC we use postponed_rq to postpone the current |
| * request so that ide.c will be able to service pending requests on the |
| * other device. Note that at most we will have only one DSC (usually |
| * data transfer) request in the device request queue. |
| */ |
| struct request *postponed_rq; |
| /* The time in which we started polling for DSC */ |
| unsigned long dsc_polling_start; |
| /* Timer used to poll for dsc */ |
| struct timer_list dsc_timer; |
| /* Read/Write dsc polling frequency */ |
| unsigned long best_dsc_rw_freq; |
| unsigned long dsc_poll_freq; |
| unsigned long dsc_timeout; |
| |
| /* Read position information */ |
| u8 partition; |
| /* Current block */ |
| unsigned int first_frame; |
| |
| /* Last error information */ |
| u8 sense_key, asc, ascq; |
| |
| /* Character device operation */ |
| unsigned int minor; |
| /* device name */ |
| char name[4]; |
| /* Current character device data transfer direction */ |
| u8 chrdev_dir; |
| |
| /* tape block size, usually 512 or 1024 bytes */ |
| unsigned short blk_size; |
| int user_bs_factor; |
| |
| /* Copy of the tape's Capabilities and Mechanical Page */ |
| u8 caps[20]; |
| |
| /* |
| * Active data transfer request parameters. |
| * |
| * At most, there is only one ide-tape originated data transfer request |
| * in the device request queue. This allows ide.c to easily service |
| * requests from the other device when we postpone our active request. |
| */ |
| |
| /* Data buffer size chosen based on the tape's recommendation */ |
| int buffer_size; |
| idetape_stage_t *merge_stage; |
| int merge_stage_size; |
| struct idetape_bh *bh; |
| char *b_data; |
| int b_count; |
| |
| int pages_per_buffer; |
| /* Wasted space in each stage */ |
| int excess_bh_size; |
| |
| /* Status/Action flags: long for set_bit */ |
| unsigned long flags; |
| /* protects the ide-tape queue */ |
| spinlock_t lock; |
| |
| /* Measures average tape speed */ |
| unsigned long avg_time; |
| int avg_size; |
| int avg_speed; |
| |
| /* the door is currently locked */ |
| int door_locked; |
| /* the tape hardware is write protected */ |
| char drv_write_prot; |
| /* the tape is write protected (hardware or opened as read-only) */ |
| char write_prot; |
| |
| u32 debug_mask; |
| } idetape_tape_t; |
| |
| static DEFINE_MUTEX(idetape_ref_mutex); |
| |
| static struct class *idetape_sysfs_class; |
| |
| #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) |
| |
| #define ide_tape_g(disk) \ |
| container_of((disk)->private_data, struct ide_tape_obj, driver) |
| |
| static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) |
| { |
| struct ide_tape_obj *tape = NULL; |
| |
| mutex_lock(&idetape_ref_mutex); |
| tape = ide_tape_g(disk); |
| if (tape) |
| kref_get(&tape->kref); |
| mutex_unlock(&idetape_ref_mutex); |
| return tape; |
| } |
| |
| static void ide_tape_release(struct kref *); |
| |
| static void ide_tape_put(struct ide_tape_obj *tape) |
| { |
| mutex_lock(&idetape_ref_mutex); |
| kref_put(&tape->kref, ide_tape_release); |
| mutex_unlock(&idetape_ref_mutex); |
| } |
| |
| /* |
| * The variables below are used for the character device interface. Additional |
| * state variables are defined in our ide_drive_t structure. |
| */ |
| static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
| |
| #define ide_tape_f(file) ((file)->private_data) |
| |
| static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) |
| { |
| struct ide_tape_obj *tape = NULL; |
| |
| mutex_lock(&idetape_ref_mutex); |
| tape = idetape_devs[i]; |
| if (tape) |
| kref_get(&tape->kref); |
| mutex_unlock(&idetape_ref_mutex); |
| return tape; |
| } |
| |
| static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
| unsigned int bcount) |
| { |
| struct idetape_bh *bh = pc->bh; |
| int count; |
| |
| while (bcount) { |
| if (bh == NULL) { |
| printk(KERN_ERR "ide-tape: bh == NULL in " |
| "idetape_input_buffers\n"); |
| ide_atapi_discard_data(drive, bcount); |
| return; |
| } |
| count = min( |
| (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), |
| bcount); |
| HWIF(drive)->atapi_input_bytes(drive, bh->b_data + |
| atomic_read(&bh->b_count), count); |
| bcount -= count; |
| atomic_add(count, &bh->b_count); |
| if (atomic_read(&bh->b_count) == bh->b_size) { |
| bh = bh->b_reqnext; |
| if (bh) |
| atomic_set(&bh->b_count, 0); |
| } |
| } |
| pc->bh = bh; |
| } |
| |
| static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, |
| unsigned int bcount) |
| { |
| struct idetape_bh *bh = pc->bh; |
| int count; |
| |
| while (bcount) { |
| if (bh == NULL) { |
| printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
| __func__); |
| return; |
| } |
| count = min((unsigned int)pc->b_count, (unsigned int)bcount); |
| HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count); |
| bcount -= count; |
| pc->b_data += count; |
| pc->b_count -= count; |
| if (!pc->b_count) { |
| bh = bh->b_reqnext; |
| pc->bh = bh; |
| if (bh) { |
| pc->b_data = bh->b_data; |
| pc->b_count = atomic_read(&bh->b_count); |
| } |
| } |
| } |
| } |
| |
| static void idetape_update_buffers(struct ide_atapi_pc *pc) |
| { |
| struct idetape_bh *bh = pc->bh; |
| int count; |
| unsigned int bcount = pc->xferred; |
| |
| if (pc->flags & PC_FLAG_WRITING) |
| return; |
| while (bcount) { |
| if (bh == NULL) { |
| printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
| __func__); |
| return; |
| } |
| count = min((unsigned int)bh->b_size, (unsigned int)bcount); |
| atomic_set(&bh->b_count, count); |
| if (atomic_read(&bh->b_count) == bh->b_size) |
| bh = bh->b_reqnext; |
| bcount -= count; |
| } |
| pc->bh = bh; |
| } |
| |
| /* |
| * idetape_next_pc_storage returns a pointer to a place in which we can |
| * safely store a packet command, even though we intend to leave the |
| * driver. A storage space for a maximum of IDETAPE_PC_STACK packet |
| * commands is allocated at initialization time. |
| */ |
| static struct ide_atapi_pc *idetape_next_pc_storage(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index); |
| |
| if (tape->pc_stack_index == IDETAPE_PC_STACK) |
| tape->pc_stack_index = 0; |
| return (&tape->pc_stack[tape->pc_stack_index++]); |
| } |
| |
| /* |
| * idetape_next_rq_storage is used along with idetape_next_pc_storage. |
| * Since we queue packet commands in the request queue, we need to |
| * allocate a request, along with the allocation of a packet command. |
| */ |
| |
| /************************************************************** |
| * * |
| * This should get fixed to use kmalloc(.., GFP_ATOMIC) * |
| * followed later on by kfree(). -ml * |
| * * |
| **************************************************************/ |
| |
| static struct request *idetape_next_rq_storage(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index); |
| |
| if (tape->rq_stack_index == IDETAPE_PC_STACK) |
| tape->rq_stack_index = 0; |
| return (&tape->rq_stack[tape->rq_stack_index++]); |
| } |
| |
| static void idetape_init_pc(struct ide_atapi_pc *pc) |
| { |
| memset(pc->c, 0, 12); |
| pc->retries = 0; |
| pc->flags = 0; |
| pc->req_xfer = 0; |
| pc->buf = pc->pc_buf; |
| pc->buf_size = IDETAPE_PC_BUFFER_SIZE; |
| pc->bh = NULL; |
| pc->b_data = NULL; |
| } |
| |
| /* |
| * called on each failed packet command retry to analyze the request sense. We |
| * currently do not utilize this information. |
| */ |
| static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct ide_atapi_pc *pc = tape->failed_pc; |
| |
| tape->sense_key = sense[2] & 0xF; |
| tape->asc = sense[12]; |
| tape->ascq = sense[13]; |
| |
| debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", |
| pc->c[0], tape->sense_key, tape->asc, tape->ascq); |
| |
| /* Correct pc->xferred by asking the tape. */ |
| if (pc->flags & PC_FLAG_DMA_ERROR) { |
| pc->xferred = pc->req_xfer - |
| tape->blk_size * |
| be32_to_cpu(get_unaligned((u32 *)&sense[3])); |
| idetape_update_buffers(pc); |
| } |
| |
| /* |
| * If error was the result of a zero-length read or write command, |
| * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives |
| * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. |
| */ |
| if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
| /* length == 0 */ |
| && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { |
| if (tape->sense_key == 5) { |
| /* don't report an error, everything's ok */ |
| pc->error = 0; |
| /* don't retry read/write */ |
| pc->flags |= PC_FLAG_ABORT; |
| } |
| } |
| if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
| pc->error = IDETAPE_ERROR_FILEMARK; |
| pc->flags |= PC_FLAG_ABORT; |
| } |
| if (pc->c[0] == WRITE_6) { |
| if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
| && tape->asc == 0x0 && tape->ascq == 0x2)) { |
| pc->error = IDETAPE_ERROR_EOD; |
| pc->flags |= PC_FLAG_ABORT; |
| } |
| } |
| if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
| if (tape->sense_key == 8) { |
| pc->error = IDETAPE_ERROR_EOD; |
| pc->flags |= PC_FLAG_ABORT; |
| } |
| if (!(pc->flags & PC_FLAG_ABORT) && |
| pc->xferred) |
| pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
| } |
| } |
| |
| /* Free a stage along with its related buffers completely. */ |
| static void __idetape_kfree_stage(idetape_stage_t *stage) |
| { |
| struct idetape_bh *prev_bh, *bh = stage->bh; |
| int size; |
| |
| while (bh != NULL) { |
| if (bh->b_data != NULL) { |
| size = (int) bh->b_size; |
| while (size > 0) { |
| free_page((unsigned long) bh->b_data); |
| size -= PAGE_SIZE; |
| bh->b_data += PAGE_SIZE; |
| } |
| } |
| prev_bh = bh; |
| bh = bh->b_reqnext; |
| kfree(prev_bh); |
| } |
| kfree(stage); |
| } |
| |
| static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) |
| { |
| struct request *rq = HWGROUP(drive)->rq; |
| idetape_tape_t *tape = drive->driver_data; |
| unsigned long flags; |
| int error; |
| |
| debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| |
| switch (uptodate) { |
| case 0: error = IDETAPE_ERROR_GENERAL; break; |
| case 1: error = 0; break; |
| default: error = uptodate; |
| } |
| rq->errors = error; |
| if (error) |
| tape->failed_pc = NULL; |
| |
| if (!blk_special_request(rq)) { |
| ide_end_request(drive, uptodate, nr_sects); |
| return 0; |
| } |
| |
| spin_lock_irqsave(&tape->lock, flags); |
| |
| ide_end_drive_cmd(drive, 0, 0); |
| |
| spin_unlock_irqrestore(&tape->lock, flags); |
| return 0; |
| } |
| |
| static ide_startstop_t idetape_request_sense_callback(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| |
| if (!tape->pc->error) { |
| idetape_analyze_error(drive, tape->pc->buf); |
| idetape_end_request(drive, 1, 0); |
| } else { |
| printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - " |
| "Aborting request!\n"); |
| idetape_end_request(drive, 0, 0); |
| } |
| return ide_stopped; |
| } |
| |
| static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc) |
| { |
| idetape_init_pc(pc); |
| pc->c[0] = REQUEST_SENSE; |
| pc->c[4] = 20; |
| pc->req_xfer = 20; |
| pc->idetape_callback = &idetape_request_sense_callback; |
| } |
| |
| static void idetape_init_rq(struct request *rq, u8 cmd) |
| { |
| memset(rq, 0, sizeof(*rq)); |
| rq->cmd_type = REQ_TYPE_SPECIAL; |
| rq->cmd[0] = cmd; |
| } |
| |
| /* |
| * Generate a new packet command request in front of the request queue, before |
| * the current request, so that it will be processed immediately, on the next |
| * pass through the driver. The function below is called from the request |
| * handling part of the driver (the "bottom" part). Safe storage for the request |
| * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that. |
| * |
| * Memory for those requests is pre-allocated at initialization time, and is |
| * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for |
| * the maximum possible number of inter-dependent packet commands. |
| * |
| * The higher level of the driver - The ioctl handler and the character device |
| * handling functions should queue request to the lower level part and wait for |
| * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail. |
| */ |
| static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc, |
| struct request *rq) |
| { |
| struct ide_tape_obj *tape = drive->driver_data; |
| |
| idetape_init_rq(rq, REQ_IDETAPE_PC1); |
| rq->buffer = (char *) pc; |
| rq->rq_disk = tape->disk; |
| (void) ide_do_drive_cmd(drive, rq, ide_preempt); |
| } |
| |
| /* |
| * idetape_retry_pc is called when an error was detected during the |
| * last packet command. We queue a request sense packet command in |
| * the head of the request list. |
| */ |
| static ide_startstop_t idetape_retry_pc (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct ide_atapi_pc *pc; |
| struct request *rq; |
| |
| (void)ide_read_error(drive); |
| pc = idetape_next_pc_storage(drive); |
| rq = idetape_next_rq_storage(drive); |
| idetape_create_request_sense_cmd(pc); |
| set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
| idetape_queue_pc_head(drive, pc, rq); |
| return ide_stopped; |
| } |
| |
| /* |
| * Postpone the current request so that ide.c will be able to service requests |
| * from another device on the same hwgroup while we are polling for DSC. |
| */ |
| static void idetape_postpone_request(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| |
| tape->postponed_rq = HWGROUP(drive)->rq; |
| ide_stall_queue(drive, tape->dsc_poll_freq); |
| } |
| |
| typedef void idetape_io_buf(ide_drive_t *, struct ide_atapi_pc *, unsigned int); |
| |
| /* |
| * This is the usual interrupt handler which will be called during a packet |
| * command. We will transfer some of the data (as requested by the drive) and |
| * will re-point interrupt handler to us. When data transfer is finished, we |
| * will act according to the algorithm described before |
| * idetape_issue_pc. |
| */ |
| static ide_startstop_t idetape_pc_intr(ide_drive_t *drive) |
| { |
| ide_hwif_t *hwif = drive->hwif; |
| idetape_tape_t *tape = drive->driver_data; |
| struct ide_atapi_pc *pc = tape->pc; |
| xfer_func_t *xferfunc; |
| idetape_io_buf *iobuf; |
| unsigned int temp; |
| #if SIMULATE_ERRORS |
| static int error_sim_count; |
| #endif |
| u16 bcount; |
| u8 stat, ireason; |
| |
| debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__); |
| |
| /* Clear the interrupt */ |
| stat = ide_read_status(drive); |
| |
| if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { |
| if (hwif->dma_ops->dma_end(drive) || (stat & ERR_STAT)) { |
| /* |
| * A DMA error is sometimes expected. For example, |
| * if the tape is crossing a filemark during a |
| * READ command, it will issue an irq and position |
| * itself before the filemark, so that only a partial |
| * data transfer will occur (which causes the DMA |
| * error). In that case, we will later ask the tape |
| * how much bytes of the original request were |
| * actually transferred (we can't receive that |
| * information from the DMA engine on most chipsets). |
| */ |
| |
| /* |
| * On the contrary, a DMA error is never expected; |
| * it usually indicates a hardware error or abort. |
| * If the tape crosses a filemark during a READ |
| * command, it will issue an irq and position itself |
| * after the filemark (not before). Only a partial |
| * data transfer will occur, but no DMA error. |
| * (AS, 19 Apr 2001) |
| */ |
| pc->flags |= PC_FLAG_DMA_ERROR; |
| } else { |
| pc->xferred = pc->req_xfer; |
| idetape_update_buffers(pc); |
| } |
| debug_log(DBG_PROCS, "DMA finished\n"); |
| |
| } |
| |
| /* No more interrupts */ |
| if ((stat & DRQ_STAT) == 0) { |
| debug_log(DBG_SENSE, "Packet command completed, %d bytes" |
| " transferred\n", pc->xferred); |
| |
| pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; |
| local_irq_enable(); |
| |
| #if SIMULATE_ERRORS |
| if ((pc->c[0] == WRITE_6 || pc->c[0] == READ_6) && |
| (++error_sim_count % 100) == 0) { |
| printk(KERN_INFO "ide-tape: %s: simulating error\n", |
| tape->name); |
| stat |= ERR_STAT; |
| } |
| #endif |
| if ((stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE) |
| stat &= ~ERR_STAT; |
| if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) { |
| /* Error detected */ |
| debug_log(DBG_ERR, "%s: I/O error\n", tape->name); |
| |
| if (pc->c[0] == REQUEST_SENSE) { |
| printk(KERN_ERR "ide-tape: I/O error in request" |
| " sense command\n"); |
| return ide_do_reset(drive); |
| } |
| debug_log(DBG_ERR, "[cmd %x]: check condition\n", |
| pc->c[0]); |
| |
| /* Retry operation */ |
| return idetape_retry_pc(drive); |
| } |
| pc->error = 0; |
| if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && |
| (stat & SEEK_STAT) == 0) { |
| /* Media access command */ |
| tape->dsc_polling_start = jiffies; |
| tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; |
| tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; |
| /* Allow ide.c to handle other requests */ |
| idetape_postpone_request(drive); |
| return ide_stopped; |
| } |
| if (tape->failed_pc == pc) |
| tape->failed_pc = NULL; |
| /* Command finished - Call the callback function */ |
| return pc->idetape_callback(drive); |
| } |
| |
| if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { |
| pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; |
| printk(KERN_ERR "ide-tape: The tape wants to issue more " |
| "interrupts in DMA mode\n"); |
| printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n"); |
| ide_dma_off(drive); |
| return ide_do_reset(drive); |
| } |
| /* Get the number of bytes to transfer on this interrupt. */ |
| bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) | |
| hwif->INB(hwif->io_ports.lbam_addr); |
| |
| ireason = hwif->INB(hwif->io_ports.nsect_addr); |
| |
| if (ireason & CD) { |
| printk(KERN_ERR "ide-tape: CoD != 0 in %s\n", __func__); |
| return ide_do_reset(drive); |
| } |
| if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) { |
| /* Hopefully, we will never get here */ |
| printk(KERN_ERR "ide-tape: We wanted to %s, ", |
| (ireason & IO) ? "Write" : "Read"); |
| printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n", |
| (ireason & IO) ? "Read" : "Write"); |
| return ide_do_reset(drive); |
| } |
| if (!(pc->flags & PC_FLAG_WRITING)) { |
| /* Reading - Check that we have enough space */ |
| temp = pc->xferred + bcount; |
| if (temp > pc->req_xfer) { |
| if (temp > pc->buf_size) { |
| printk(KERN_ERR "ide-tape: The tape wants to " |
| "send us more data than expected " |
| "- discarding data\n"); |
| ide_atapi_discard_data(drive, bcount); |
| ide_set_handler(drive, &idetape_pc_intr, |
| IDETAPE_WAIT_CMD, NULL); |
| return ide_started; |
| } |
| debug_log(DBG_SENSE, "The tape wants to send us more " |
| "data than expected - allowing transfer\n"); |
| } |
| iobuf = &idetape_input_buffers; |
| xferfunc = hwif->atapi_input_bytes; |
| } else { |
| iobuf = &idetape_output_buffers; |
| xferfunc = hwif->atapi_output_bytes; |
| } |
| |
| if (pc->bh) |
| iobuf(drive, pc, bcount); |
| else |
| xferfunc(drive, pc->cur_pos, bcount); |
| |
| /* Update the current position */ |
| pc->xferred += bcount; |
| pc->cur_pos += bcount; |
| |
| debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n", |
| pc->c[0], bcount); |
| |
| /* And set the interrupt handler again */ |
| ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); |
| return ide_started; |
| } |
| |
| /* |
| * Packet Command Interface |
| * |
| * The current Packet Command is available in tape->pc, and will not change |
| * until we finish handling it. Each packet command is associated with a |
| * callback function that will be called when the command is finished. |
| * |
| * The handling will be done in three stages: |
| * |
| * 1. idetape_issue_pc will send the packet command to the drive, and will set |
| * the interrupt handler to idetape_pc_intr. |
| * |
| * 2. On each interrupt, idetape_pc_intr will be called. This step will be |
| * repeated until the device signals us that no more interrupts will be issued. |
| * |
| * 3. ATAPI Tape media access commands have immediate status with a delayed |
| * process. In case of a successful initiation of a media access packet command, |
| * the DSC bit will be set when the actual execution of the command is finished. |
| * Since the tape drive will not issue an interrupt, we have to poll for this |
| * event. In this case, we define the request as "low priority request" by |
| * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and |
| * exit the driver. |
| * |
| * ide.c will then give higher priority to requests which originate from the |
| * other device, until will change rq_status to RQ_ACTIVE. |
| * |
| * 4. When the packet command is finished, it will be checked for errors. |
| * |
| * 5. In case an error was found, we queue a request sense packet command in |
| * front of the request queue and retry the operation up to |
| * IDETAPE_MAX_PC_RETRIES times. |
| * |
| * 6. In case no error was found, or we decided to give up and not to retry |
| * again, the callback function will be called and then we will handle the next |
| * request. |
| */ |
| static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) |
| { |
| ide_hwif_t *hwif = drive->hwif; |
| idetape_tape_t *tape = drive->driver_data; |
| struct ide_atapi_pc *pc = tape->pc; |
| int retries = 100; |
| ide_startstop_t startstop; |
| u8 ireason; |
| |
| if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) { |
| printk(KERN_ERR "ide-tape: Strange, packet command initiated " |
| "yet DRQ isn't asserted\n"); |
| return startstop; |
| } |
| ireason = hwif->INB(hwif->io_ports.nsect_addr); |
| while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) { |
| printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing " |
| "a packet command, retrying\n"); |
| udelay(100); |
| ireason = hwif->INB(hwif->io_ports.nsect_addr); |
| if (retries == 0) { |
| printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while " |
| "issuing a packet command, ignoring\n"); |
| ireason |= CD; |
| ireason &= ~IO; |
| } |
| } |
| if ((ireason & CD) == 0 || (ireason & IO)) { |
| printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing " |
| "a packet command\n"); |
| return ide_do_reset(drive); |
| } |
| /* Set the interrupt routine */ |
| ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); |
| #ifdef CONFIG_BLK_DEV_IDEDMA |
| /* Begin DMA, if necessary */ |
| if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) |
| hwif->dma_ops->dma_start(drive); |
| #endif |
| /* Send the actual packet */ |
| HWIF(drive)->atapi_output_bytes(drive, pc->c, 12); |
| return ide_started; |
| } |
| |
| static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, |
| struct ide_atapi_pc *pc) |
| { |
| ide_hwif_t *hwif = drive->hwif; |
| idetape_tape_t *tape = drive->driver_data; |
| int dma_ok = 0; |
| u16 bcount; |
| |
| if (tape->pc->c[0] == REQUEST_SENSE && |
| pc->c[0] == REQUEST_SENSE) { |
| printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " |
| "Two request sense in serial were issued\n"); |
| } |
| |
| if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
| tape->failed_pc = pc; |
| /* Set the current packet command */ |
| tape->pc = pc; |
| |
| if (pc->retries > IDETAPE_MAX_PC_RETRIES || |
| (pc->flags & PC_FLAG_ABORT)) { |
| /* |
| * We will "abort" retrying a packet command in case legitimate |
| * error code was received (crossing a filemark, or end of the |
| * media, for example). |
| */ |
| if (!(pc->flags & PC_FLAG_ABORT)) { |
| if (!(pc->c[0] == TEST_UNIT_READY && |
| tape->sense_key == 2 && tape->asc == 4 && |
| (tape->ascq == 1 || tape->ascq == 8))) { |
| printk(KERN_ERR "ide-tape: %s: I/O error, " |
| "pc = %2x, key = %2x, " |
| "asc = %2x, ascq = %2x\n", |
| tape->name, pc->c[0], |
| tape->sense_key, tape->asc, |
| tape->ascq); |
| } |
| /* Giving up */ |
| pc->error = IDETAPE_ERROR_GENERAL; |
| } |
| tape->failed_pc = NULL; |
| return pc->idetape_callback(drive); |
| } |
| debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); |
| |
| pc->retries++; |
| /* We haven't transferred any data yet */ |
| pc->xferred = 0; |
| pc->cur_pos = pc->buf; |
| /* Request to transfer the entire buffer at once */ |
| bcount = pc->req_xfer; |
| |
| if (pc->flags & PC_FLAG_DMA_ERROR) { |
| pc->flags &= ~PC_FLAG_DMA_ERROR; |
| printk(KERN_WARNING "ide-tape: DMA disabled, " |
| "reverting to PIO\n"); |
| ide_dma_off(drive); |
| } |
| if ((pc->flags & PC_FLAG_DMA_RECOMMENDED) && drive->using_dma) |
| dma_ok = !hwif->dma_ops->dma_setup(drive); |
| |
| ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK | |
| IDE_TFLAG_OUT_DEVICE, bcount, dma_ok); |
| |
| if (dma_ok) |
| /* Will begin DMA later */ |
| pc->flags |= PC_FLAG_DMA_IN_PROGRESS; |
| if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags)) { |
| ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc, |
| IDETAPE_WAIT_CMD, NULL); |
| return ide_started; |
| } else { |
| hwif->OUTB(WIN_PACKETCMD, hwif->io_ports.command_addr); |
| return idetape_transfer_pc(drive); |
| } |
| } |
| |
| static ide_startstop_t idetape_pc_callback(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| |
| idetape_end_request(drive, tape->pc->error ? 0 : 1, 0); |
| return ide_stopped; |
| } |
| |
| /* A mode sense command is used to "sense" tape parameters. */ |
| static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
| { |
| idetape_init_pc(pc); |
| pc->c[0] = MODE_SENSE; |
| if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
| /* DBD = 1 - Don't return block descriptors */ |
| pc->c[1] = 8; |
| pc->c[2] = page_code; |
| /* |
| * Changed pc->c[3] to 0 (255 will at best return unused info). |
| * |
| * For SCSI this byte is defined as subpage instead of high byte |
| * of length and some IDE drives seem to interpret it this way |
| * and return an error when 255 is used. |
| */ |
| pc->c[3] = 0; |
| /* We will just discard data in that case */ |
| pc->c[4] = 255; |
| if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
| pc->req_xfer = 12; |
| else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
| pc->req_xfer = 24; |
| else |
| pc->req_xfer = 50; |
| pc->idetape_callback = &idetape_pc_callback; |
| } |
| |
| static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct ide_atapi_pc *pc = tape->pc; |
| u8 stat; |
| |
| stat = ide_read_status(drive); |
| |
| if (stat & SEEK_STAT) { |
| if (stat & ERR_STAT) { |
| /* Error detected */ |
| if (pc->c[0] != TEST_UNIT_READY) |
| printk(KERN_ERR "ide-tape: %s: I/O error, ", |
| tape->name); |
| /* Retry operation */ |
| return idetape_retry_pc(drive); |
| } |
| pc->error = 0; |
| if (tape->failed_pc == pc) |
| tape->failed_pc = NULL; |
| } else { |
| pc->error = IDETAPE_ERROR_GENERAL; |
| tape->failed_pc = NULL; |
| } |
| return pc->idetape_callback(drive); |
| } |
| |
| static ide_startstop_t idetape_rw_callback(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct request *rq = HWGROUP(drive)->rq; |
| int blocks = tape->pc->xferred / tape->blk_size; |
| |
| tape->avg_size += blocks * tape->blk_size; |
| |
| if (time_after_eq(jiffies, tape->avg_time + HZ)) { |
| tape->avg_speed = tape->avg_size * HZ / |
| (jiffies - tape->avg_time) / 1024; |
| tape->avg_size = 0; |
| tape->avg_time = jiffies; |
| } |
| debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| |
| tape->first_frame += blocks; |
| rq->current_nr_sectors -= blocks; |
| |
| if (!tape->pc->error) |
| idetape_end_request(drive, 1, 0); |
| else |
| idetape_end_request(drive, tape->pc->error, 0); |
| return ide_stopped; |
| } |
| |
| static void idetape_create_read_cmd(idetape_tape_t *tape, |
| struct ide_atapi_pc *pc, |
| unsigned int length, struct idetape_bh *bh) |
| { |
| idetape_init_pc(pc); |
| pc->c[0] = READ_6; |
| put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
| pc->c[1] = 1; |
| pc->idetape_callback = &idetape_rw_callback; |
| pc->bh = bh; |
| atomic_set(&bh->b_count, 0); |
| pc->buf = NULL; |
| pc->buf_size = length * tape->blk_size; |
| pc->req_xfer = pc->buf_size; |
| if (pc->req_xfer == tape->buffer_size) |
| pc->flags |= PC_FLAG_DMA_RECOMMENDED; |
| } |
| |
| static void idetape_create_write_cmd(idetape_tape_t *tape, |
| struct ide_atapi_pc *pc, |
| unsigned int length, struct idetape_bh *bh) |
| { |
| idetape_init_pc(pc); |
| pc->c[0] = WRITE_6; |
| put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
| pc->c[1] = 1; |
| pc->idetape_callback = &idetape_rw_callback; |
| pc->flags |= PC_FLAG_WRITING; |
| pc->bh = bh; |
| pc->b_data = bh->b_data; |
| pc->b_count = atomic_read(&bh->b_count); |
| pc->buf = NULL; |
| pc->buf_size = length * tape->blk_size; |
| pc->req_xfer = pc->buf_size; |
| if (pc->req_xfer == tape->buffer_size) |
| pc->flags |= PC_FLAG_DMA_RECOMMENDED; |
| } |
| |
| static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
| struct request *rq, sector_t block) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct ide_atapi_pc *pc = NULL; |
| struct request *postponed_rq = tape->postponed_rq; |
| u8 stat; |
| |
| debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld," |
| " current_nr_sectors: %d\n", |
| rq->sector, rq->nr_sectors, rq->current_nr_sectors); |
| |
| if (!blk_special_request(rq)) { |
| /* We do not support buffer cache originated requests. */ |
| printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " |
| "request queue (%d)\n", drive->name, rq->cmd_type); |
| ide_end_request(drive, 0, 0); |
| return ide_stopped; |
| } |
| |
| /* Retry a failed packet command */ |
| if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) |
| return idetape_issue_pc(drive, tape->failed_pc); |
| |
| if (postponed_rq != NULL) |
| if (rq != postponed_rq) { |
| printk(KERN_ERR "ide-tape: ide-tape.c bug - " |
| "Two DSC requests were queued\n"); |
| idetape_end_request(drive, 0, 0); |
| return ide_stopped; |
| } |
| |
| tape->postponed_rq = NULL; |
| |
| /* |
| * If the tape is still busy, postpone our request and service |
| * the other device meanwhile. |
| */ |
| stat = ide_read_status(drive); |
| |
| if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2)) |
| set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
| |
| if (drive->post_reset == 1) { |
| set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); |
| drive->post_reset = 0; |
| } |
| |
| if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags) && |
| (stat & SEEK_STAT) == 0) { |
| if (postponed_rq == NULL) { |
| tape->dsc_polling_start = jiffies; |
| tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
| tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
| } else if (time_after(jiffies, tape->dsc_timeout)) { |
| printk(KERN_ERR "ide-tape: %s: DSC timeout\n", |
| tape->name); |
| if (rq->cmd[0] & REQ_IDETAPE_PC2) { |
| idetape_media_access_finished(drive); |
| return ide_stopped; |
| } else { |
| return ide_do_reset(drive); |
| } |
| } else if (time_after(jiffies, |
| tape->dsc_polling_start + |
| IDETAPE_DSC_MA_THRESHOLD)) |
| tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
| idetape_postpone_request(drive); |
| return ide_stopped; |
| } |
| if (rq->cmd[0] & REQ_IDETAPE_READ) { |
| pc = idetape_next_pc_storage(drive); |
| idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, |
| (struct idetape_bh *)rq->special); |
| goto out; |
| } |
| if (rq->cmd[0] & REQ_IDETAPE_WRITE) { |
| pc = idetape_next_pc_storage(drive); |
| idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, |
| (struct idetape_bh *)rq->special); |
| goto out; |
| } |
| if (rq->cmd[0] & REQ_IDETAPE_PC1) { |
| pc = (struct ide_atapi_pc *) rq->buffer; |
| rq->cmd[0] &= ~(REQ_IDETAPE_PC1); |
| rq->cmd[0] |= REQ_IDETAPE_PC2; |
| goto out; |
| } |
| if (rq->cmd[0] & REQ_IDETAPE_PC2) { |
| idetape_media_access_finished(drive); |
| return ide_stopped; |
| } |
| BUG(); |
| out: |
| return idetape_issue_pc(drive, pc); |
| } |
| |
| /* |
| * The function below uses __get_free_pages to allocate a data buffer of size |
| * tape->buffer_size (or a bit more). We attempt to combine sequential pages as |
| * much as possible. |
| * |
| * It returns a pointer to the newly allocated buffer, or NULL in case of |
| * failure. |
| */ |
| static idetape_stage_t *ide_tape_kmalloc_buffer(idetape_tape_t *tape, int full, |
| int clear) |
| { |
| idetape_stage_t *stage; |
| struct idetape_bh *prev_bh, *bh; |
| int pages = tape->pages_per_buffer; |
| unsigned int order, b_allocd; |
| char *b_data = NULL; |
| |
| stage = kmalloc(sizeof(idetape_stage_t), GFP_KERNEL); |
| if (!stage) |
| return NULL; |
| stage->next = NULL; |
| |
| stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
| bh = stage->bh; |
| if (bh == NULL) |
| goto abort; |
| |
| order = fls(pages) - 1; |
| bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); |
| if (!bh->b_data) |
| goto abort; |
| b_allocd = (1 << order) * PAGE_SIZE; |
| pages &= (order-1); |
| |
| if (clear) |
| memset(bh->b_data, 0, b_allocd); |
| bh->b_reqnext = NULL; |
| bh->b_size = b_allocd; |
| atomic_set(&bh->b_count, full ? bh->b_size : 0); |
| |
| while (pages) { |
| order = fls(pages) - 1; |
| b_data = (char *) __get_free_pages(GFP_KERNEL, order); |
| if (!b_data) |
| goto abort; |
| b_allocd = (1 << order) * PAGE_SIZE; |
| |
| if (clear) |
| memset(b_data, 0, b_allocd); |
| |
| /* newly allocated page frames below buffer header or ...*/ |
| if (bh->b_data == b_data + b_allocd) { |
| bh->b_size += b_allocd; |
| bh->b_data -= b_allocd; |
| if (full) |
| atomic_add(b_allocd, &bh->b_count); |
| continue; |
| } |
| /* they are above the header */ |
| if (b_data == bh->b_data + bh->b_size) { |
| bh->b_size += b_allocd; |
| if (full) |
| atomic_add(b_allocd, &bh->b_count); |
| continue; |
| } |
| prev_bh = bh; |
| bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); |
| if (!bh) { |
| free_pages((unsigned long) b_data, order); |
| goto abort; |
| } |
| bh->b_reqnext = NULL; |
| bh->b_data = b_data; |
| bh->b_size = b_allocd; |
| atomic_set(&bh->b_count, full ? bh->b_size : 0); |
| prev_bh->b_reqnext = bh; |
| |
| pages &= (order-1); |
| } |
| |
| bh->b_size -= tape->excess_bh_size; |
| if (full) |
| atomic_sub(tape->excess_bh_size, &bh->b_count); |
| return stage; |
| abort: |
| __idetape_kfree_stage(stage); |
| return NULL; |
| } |
| |
| static int idetape_copy_stage_from_user(idetape_tape_t *tape, |
| const char __user *buf, int n) |
| { |
| struct idetape_bh *bh = tape->bh; |
| int count; |
| int ret = 0; |
| |
| while (n) { |
| if (bh == NULL) { |
| printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
| __func__); |
| return 1; |
| } |
| count = min((unsigned int) |
| (bh->b_size - atomic_read(&bh->b_count)), |
| (unsigned int)n); |
| if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, |
| count)) |
| ret = 1; |
| n -= count; |
| atomic_add(count, &bh->b_count); |
| buf += count; |
| if (atomic_read(&bh->b_count) == bh->b_size) { |
| bh = bh->b_reqnext; |
| if (bh) |
| atomic_set(&bh->b_count, 0); |
| } |
| } |
| tape->bh = bh; |
| return ret; |
| } |
| |
| static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, |
| int n) |
| { |
| struct idetape_bh *bh = tape->bh; |
| int count; |
| int ret = 0; |
| |
| while (n) { |
| if (bh == NULL) { |
| printk(KERN_ERR "ide-tape: bh == NULL in %s\n", |
| __func__); |
| return 1; |
| } |
| count = min(tape->b_count, n); |
| if (copy_to_user(buf, tape->b_data, count)) |
| ret = 1; |
| n -= count; |
| tape->b_data += count; |
| tape->b_count -= count; |
| buf += count; |
| if (!tape->b_count) { |
| bh = bh->b_reqnext; |
| tape->bh = bh; |
| if (bh) { |
| tape->b_data = bh->b_data; |
| tape->b_count = atomic_read(&bh->b_count); |
| } |
| } |
| } |
| return ret; |
| } |
| |
| static void idetape_init_merge_stage(idetape_tape_t *tape) |
| { |
| struct idetape_bh *bh = tape->merge_stage->bh; |
| |
| tape->bh = bh; |
| if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
| atomic_set(&bh->b_count, 0); |
| else { |
| tape->b_data = bh->b_data; |
| tape->b_count = atomic_read(&bh->b_count); |
| } |
| } |
| |
| static ide_startstop_t idetape_read_position_callback(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| u8 *readpos = tape->pc->buf; |
| |
| debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| |
| if (!tape->pc->error) { |
| debug_log(DBG_SENSE, "BOP - %s\n", |
| (readpos[0] & 0x80) ? "Yes" : "No"); |
| debug_log(DBG_SENSE, "EOP - %s\n", |
| (readpos[0] & 0x40) ? "Yes" : "No"); |
| |
| if (readpos[0] & 0x4) { |
| printk(KERN_INFO "ide-tape: Block location is unknown" |
| "to the tape\n"); |
| clear_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags); |
| idetape_end_request(drive, 0, 0); |
| } else { |
| debug_log(DBG_SENSE, "Block Location - %u\n", |
| be32_to_cpu(*(u32 *)&readpos[4])); |
| |
| tape->partition = readpos[1]; |
| tape->first_frame = |
| be32_to_cpu(*(u32 *)&readpos[4]); |
| set_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags); |
| idetape_end_request(drive, 1, 0); |
| } |
| } else { |
| idetape_end_request(drive, 0, 0); |
| } |
| return ide_stopped; |
| } |
| |
| /* |
| * Write a filemark if write_filemark=1. Flush the device buffers without |
| * writing a filemark otherwise. |
| */ |
| static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
| struct ide_atapi_pc *pc, int write_filemark) |
| { |
| idetape_init_pc(pc); |
| pc->c[0] = WRITE_FILEMARKS; |
| pc->c[4] = write_filemark; |
| pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
| pc->idetape_callback = &idetape_pc_callback; |
| } |
| |
| static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc) |
| { |
| idetape_init_pc(pc); |
| pc->c[0] = TEST_UNIT_READY; |
| pc->idetape_callback = &idetape_pc_callback; |
| } |
| |
| /* |
| * We add a special packet command request to the tail of the request queue, and |
| * wait for it to be serviced. This is not to be called from within the request |
| * handling part of the driver! We allocate here data on the stack and it is |
| * valid until the request is finished. This is not the case for the bottom part |
| * of the driver, where we are always leaving the functions to wait for an |
| * interrupt or a timer event. |
| * |
| * From the bottom part of the driver, we should allocate safe memory using |
| * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request |
| * to the request list without waiting for it to be serviced! In that case, we |
| * usually use idetape_queue_pc_head(). |
| */ |
| static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc) |
| { |
| struct ide_tape_obj *tape = drive->driver_data; |
| struct request rq; |
| |
| idetape_init_rq(&rq, REQ_IDETAPE_PC1); |
| rq.buffer = (char *) pc; |
| rq.rq_disk = tape->disk; |
| return ide_do_drive_cmd(drive, &rq, ide_wait); |
| } |
| |
| static void idetape_create_load_unload_cmd(ide_drive_t *drive, |
| struct ide_atapi_pc *pc, int cmd) |
| { |
| idetape_init_pc(pc); |
| pc->c[0] = START_STOP; |
| pc->c[4] = cmd; |
| pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
| pc->idetape_callback = &idetape_pc_callback; |
| } |
| |
| static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct ide_atapi_pc pc; |
| int load_attempted = 0; |
| |
| /* Wait for the tape to become ready */ |
| set_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags); |
| timeout += jiffies; |
| while (time_before(jiffies, timeout)) { |
| idetape_create_test_unit_ready_cmd(&pc); |
| if (!idetape_queue_pc_tail(drive, &pc)) |
| return 0; |
| if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) |
| || (tape->asc == 0x3A)) { |
| /* no media */ |
| if (load_attempted) |
| return -ENOMEDIUM; |
| idetape_create_load_unload_cmd(drive, &pc, |
| IDETAPE_LU_LOAD_MASK); |
| idetape_queue_pc_tail(drive, &pc); |
| load_attempted = 1; |
| /* not about to be ready */ |
| } else if (!(tape->sense_key == 2 && tape->asc == 4 && |
| (tape->ascq == 1 || tape->ascq == 8))) |
| return -EIO; |
| msleep(100); |
| } |
| return -EIO; |
| } |
| |
| static int idetape_flush_tape_buffers(ide_drive_t *drive) |
| { |
| struct ide_atapi_pc pc; |
| int rc; |
| |
| idetape_create_write_filemark_cmd(drive, &pc, 0); |
| rc = idetape_queue_pc_tail(drive, &pc); |
| if (rc) |
| return rc; |
| idetape_wait_ready(drive, 60 * 5 * HZ); |
| return 0; |
| } |
| |
| static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) |
| { |
| idetape_init_pc(pc); |
| pc->c[0] = READ_POSITION; |
| pc->req_xfer = 20; |
| pc->idetape_callback = &idetape_read_position_callback; |
| } |
| |
| static int idetape_read_position(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct ide_atapi_pc pc; |
| int position; |
| |
| debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| |
| idetape_create_read_position_cmd(&pc); |
| if (idetape_queue_pc_tail(drive, &pc)) |
| return -1; |
| position = tape->first_frame; |
| return position; |
| } |
| |
| static void idetape_create_locate_cmd(ide_drive_t *drive, |
| struct ide_atapi_pc *pc, |
| unsigned int block, u8 partition, int skip) |
| { |
| idetape_init_pc(pc); |
| pc->c[0] = POSITION_TO_ELEMENT; |
| pc->c[1] = 2; |
| put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
| pc->c[8] = partition; |
| pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
| pc->idetape_callback = &idetape_pc_callback; |
| } |
| |
| static int idetape_create_prevent_cmd(ide_drive_t *drive, |
| struct ide_atapi_pc *pc, int prevent) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| /* device supports locking according to capabilities page */ |
| if (!(tape->caps[6] & 0x01)) |
| return 0; |
| |
| idetape_init_pc(pc); |
| pc->c[0] = ALLOW_MEDIUM_REMOVAL; |
| pc->c[4] = prevent; |
| pc->idetape_callback = &idetape_pc_callback; |
| return 1; |
| } |
| |
| static int __idetape_discard_read_pipeline(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| if (tape->chrdev_dir != IDETAPE_DIR_READ) |
| return 0; |
| |
| clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags); |
| tape->merge_stage_size = 0; |
| if (tape->merge_stage != NULL) { |
| __idetape_kfree_stage(tape->merge_stage); |
| tape->merge_stage = NULL; |
| } |
| |
| tape->chrdev_dir = IDETAPE_DIR_NONE; |
| |
| return 0; |
| } |
| |
| /* |
| * Position the tape to the requested block using the LOCATE packet command. |
| * A READ POSITION command is then issued to check where we are positioned. Like |
| * all higher level operations, we queue the commands at the tail of the request |
| * queue and wait for their completion. |
| */ |
| static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
| u8 partition, int skip) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int retval; |
| struct ide_atapi_pc pc; |
| |
| if (tape->chrdev_dir == IDETAPE_DIR_READ) |
| __idetape_discard_read_pipeline(drive); |
| idetape_wait_ready(drive, 60 * 5 * HZ); |
| idetape_create_locate_cmd(drive, &pc, block, partition, skip); |
| retval = idetape_queue_pc_tail(drive, &pc); |
| if (retval) |
| return (retval); |
| |
| idetape_create_read_position_cmd(&pc); |
| return (idetape_queue_pc_tail(drive, &pc)); |
| } |
| |
| static void idetape_discard_read_pipeline(ide_drive_t *drive, |
| int restore_position) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int cnt; |
| int seek, position; |
| |
| cnt = __idetape_discard_read_pipeline(drive); |
| if (restore_position) { |
| position = idetape_read_position(drive); |
| seek = position > cnt ? position - cnt : 0; |
| if (idetape_position_tape(drive, seek, 0, 0)) { |
| printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
| " discard_pipeline()\n", tape->name); |
| return; |
| } |
| } |
| } |
| |
| /* |
| * Generate a read/write request for the block device interface and wait for it |
| * to be serviced. |
| */ |
| static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, |
| struct idetape_bh *bh) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct request rq; |
| |
| debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); |
| |
| idetape_init_rq(&rq, cmd); |
| rq.rq_disk = tape->disk; |
| rq.special = (void *)bh; |
| rq.sector = tape->first_frame; |
| rq.nr_sectors = blocks; |
| rq.current_nr_sectors = blocks; |
| (void) ide_do_drive_cmd(drive, &rq, ide_wait); |
| |
| if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) |
| return 0; |
| |
| if (tape->merge_stage) |
| idetape_init_merge_stage(tape); |
| if (rq.errors == IDETAPE_ERROR_GENERAL) |
| return -EIO; |
| return (tape->blk_size * (blocks-rq.current_nr_sectors)); |
| } |
| |
| static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
| { |
| idetape_init_pc(pc); |
| pc->c[0] = INQUIRY; |
| pc->c[4] = 254; |
| pc->req_xfer = 254; |
| pc->idetape_callback = &idetape_pc_callback; |
| } |
| |
| static void idetape_create_rewind_cmd(ide_drive_t *drive, |
| struct ide_atapi_pc *pc) |
| { |
| idetape_init_pc(pc); |
| pc->c[0] = REZERO_UNIT; |
| pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
| pc->idetape_callback = &idetape_pc_callback; |
| } |
| |
| static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
| { |
| idetape_init_pc(pc); |
| pc->c[0] = ERASE; |
| pc->c[1] = 1; |
| pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
| pc->idetape_callback = &idetape_pc_callback; |
| } |
| |
| static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
| { |
| idetape_init_pc(pc); |
| pc->c[0] = SPACE; |
| put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
| pc->c[1] = cmd; |
| pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
| pc->idetape_callback = &idetape_pc_callback; |
| } |
| |
| /* Queue up a character device originated write request. */ |
| static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
| |
| return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
| blocks, tape->merge_stage->bh); |
| } |
| |
| static void idetape_empty_write_pipeline(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int blocks, min; |
| struct idetape_bh *bh; |
| |
| if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
| printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline," |
| " but we are not writing.\n"); |
| return; |
| } |
| if (tape->merge_stage_size > tape->buffer_size) { |
| printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
| tape->merge_stage_size = tape->buffer_size; |
| } |
| if (tape->merge_stage_size) { |
| blocks = tape->merge_stage_size / tape->blk_size; |
| if (tape->merge_stage_size % tape->blk_size) { |
| unsigned int i; |
| |
| blocks++; |
| i = tape->blk_size - tape->merge_stage_size % |
| tape->blk_size; |
| bh = tape->bh->b_reqnext; |
| while (bh) { |
| atomic_set(&bh->b_count, 0); |
| bh = bh->b_reqnext; |
| } |
| bh = tape->bh; |
| while (i) { |
| if (bh == NULL) { |
| printk(KERN_INFO "ide-tape: bug," |
| " bh NULL\n"); |
| break; |
| } |
| min = min(i, (unsigned int)(bh->b_size - |
| atomic_read(&bh->b_count))); |
| memset(bh->b_data + atomic_read(&bh->b_count), |
| 0, min); |
| atomic_add(min, &bh->b_count); |
| i -= min; |
| bh = bh->b_reqnext; |
| } |
| } |
| (void) idetape_add_chrdev_write_request(drive, blocks); |
| tape->merge_stage_size = 0; |
| } |
| if (tape->merge_stage != NULL) { |
| __idetape_kfree_stage(tape->merge_stage); |
| tape->merge_stage = NULL; |
| } |
| tape->chrdev_dir = IDETAPE_DIR_NONE; |
| } |
| |
| static int idetape_init_read(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int bytes_read; |
| |
| /* Initialize read operation */ |
| if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
| if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
| idetape_empty_write_pipeline(drive); |
| idetape_flush_tape_buffers(drive); |
| } |
| if (tape->merge_stage || tape->merge_stage_size) { |
| printk(KERN_ERR "ide-tape: merge_stage_size should be" |
| " 0 now\n"); |
| tape->merge_stage_size = 0; |
| } |
| tape->merge_stage = ide_tape_kmalloc_buffer(tape, 0, 0); |
| if (!tape->merge_stage) |
| return -ENOMEM; |
| tape->chrdev_dir = IDETAPE_DIR_READ; |
| |
| /* |
| * Issue a read 0 command to ensure that DSC handshake is |
| * switched from completion mode to buffer available mode. |
| * No point in issuing this if DSC overlap isn't supported, some |
| * drives (Seagate STT3401A) will return an error. |
| */ |
| if (drive->dsc_overlap) { |
| bytes_read = idetape_queue_rw_tail(drive, |
| REQ_IDETAPE_READ, 0, |
| tape->merge_stage->bh); |
| if (bytes_read < 0) { |
| __idetape_kfree_stage(tape->merge_stage); |
| tape->merge_stage = NULL; |
| tape->chrdev_dir = IDETAPE_DIR_NONE; |
| return bytes_read; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* called from idetape_chrdev_read() to service a chrdev read request. */ |
| static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); |
| |
| /* If we are at a filemark, return a read length of 0 */ |
| if (test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) |
| return 0; |
| |
| idetape_init_read(drive); |
| |
| return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, |
| tape->merge_stage->bh); |
| } |
| |
| static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct idetape_bh *bh; |
| int blocks; |
| |
| while (bcount) { |
| unsigned int count; |
| |
| bh = tape->merge_stage->bh; |
| count = min(tape->buffer_size, bcount); |
| bcount -= count; |
| blocks = count / tape->blk_size; |
| while (count) { |
| atomic_set(&bh->b_count, |
| min(count, (unsigned int)bh->b_size)); |
| memset(bh->b_data, 0, atomic_read(&bh->b_count)); |
| count -= atomic_read(&bh->b_count); |
| bh = bh->b_reqnext; |
| } |
| idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, |
| tape->merge_stage->bh); |
| } |
| } |
| |
| /* |
| * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
| * currently support only one partition. |
| */ |
| static int idetape_rewind_tape(ide_drive_t *drive) |
| { |
| int retval; |
| struct ide_atapi_pc pc; |
| idetape_tape_t *tape; |
| tape = drive->driver_data; |
| |
| debug_log(DBG_SENSE, "Enter %s\n", __func__); |
| |
| idetape_create_rewind_cmd(drive, &pc); |
| retval = idetape_queue_pc_tail(drive, &pc); |
| if (retval) |
| return retval; |
| |
| idetape_create_read_position_cmd(&pc); |
| retval = idetape_queue_pc_tail(drive, &pc); |
| if (retval) |
| return retval; |
| return 0; |
| } |
| |
| /* mtio.h compatible commands should be issued to the chrdev interface. */ |
| static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
| unsigned long arg) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| void __user *argp = (void __user *)arg; |
| |
| struct idetape_config { |
| int dsc_rw_frequency; |
| int dsc_media_access_frequency; |
| int nr_stages; |
| } config; |
| |
| debug_log(DBG_PROCS, "Enter %s\n", __func__); |
| |
| switch (cmd) { |
| case 0x0340: |
| if (copy_from_user(&config, argp, sizeof(config))) |
| return -EFAULT; |
| tape->best_dsc_rw_freq = config.dsc_rw_frequency; |
| break; |
| case 0x0350: |
| config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; |
| config.nr_stages = 1; |
| if (copy_to_user(argp, &config, sizeof(config))) |
| return -EFAULT; |
| break; |
| default: |
| return -EIO; |
| } |
| return 0; |
| } |
| |
| static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
| int mt_count) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct ide_atapi_pc pc; |
| int retval, count = 0; |
| int sprev = !!(tape->caps[4] & 0x20); |
| |
| if (mt_count == 0) |
| return 0; |
| if (MTBSF == mt_op || MTBSFM == mt_op) { |
| if (!sprev) |
| return -EIO; |
| mt_count = -mt_count; |
| } |
| |
| if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
| tape->merge_stage_size = 0; |
| if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) |
| ++count; |
| idetape_discard_read_pipeline(drive, 0); |
| } |
| |
| /* |
| * The filemark was not found in our internal pipeline; now we can issue |
| * the space command. |
| */ |
| switch (mt_op) { |
| case MTFSF: |
| case MTBSF: |
| idetape_create_space_cmd(&pc, mt_count - count, |
| IDETAPE_SPACE_OVER_FILEMARK); |
| return idetape_queue_pc_tail(drive, &pc); |
| case MTFSFM: |
| case MTBSFM: |
| if (!sprev) |
| return -EIO; |
| retval = idetape_space_over_filemarks(drive, MTFSF, |
| mt_count - count); |
| if (retval) |
| return retval; |
| count = (MTBSFM == mt_op ? 1 : -1); |
| return idetape_space_over_filemarks(drive, MTFSF, count); |
| default: |
| printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", |
| mt_op); |
| return -EIO; |
| } |
| } |
| |
| /* |
| * Our character device read / write functions. |
| * |
| * The tape is optimized to maximize throughput when it is transferring an |
| * integral number of the "continuous transfer limit", which is a parameter of |
| * the specific tape (26kB on my particular tape, 32kB for Onstream). |
| * |
| * As of version 1.3 of the driver, the character device provides an abstract |
| * continuous view of the media - any mix of block sizes (even 1 byte) on the |
| * same backup/restore procedure is supported. The driver will internally |
| * convert the requests to the recommended transfer unit, so that an unmatch |
| * between the user's block size to the recommended size will only result in a |
| * (slightly) increased driver overhead, but will no longer hit performance. |
| * This is not applicable to Onstream. |
| */ |
| static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| struct ide_tape_obj *tape = ide_tape_f(file); |
| ide_drive_t *drive = tape->drive; |
| ssize_t bytes_read, temp, actually_read = 0, rc; |
| ssize_t ret = 0; |
| u16 ctl = *(u16 *)&tape->caps[12]; |
| |
| debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
| |
| if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
| if (test_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags)) |
| if (count > tape->blk_size && |
| (count % tape->blk_size) == 0) |
| tape->user_bs_factor = count / tape->blk_size; |
| } |
| rc = idetape_init_read(drive); |
| if (rc < 0) |
| return rc; |
| if (count == 0) |
| return (0); |
| if (tape->merge_stage_size) { |
| actually_read = min((unsigned int)(tape->merge_stage_size), |
| (unsigned int)count); |
| if (idetape_copy_stage_to_user(tape, buf, actually_read)) |
| ret = -EFAULT; |
| buf += actually_read; |
| tape->merge_stage_size -= actually_read; |
| count -= actually_read; |
| } |
| while (count >= tape->buffer_size) { |
| bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
| if (bytes_read <= 0) |
| goto finish; |
| if (idetape_copy_stage_to_user(tape, buf, bytes_read)) |
| ret = -EFAULT; |
| buf += bytes_read; |
| count -= bytes_read; |
| actually_read += bytes_read; |
| } |
| if (count) { |
| bytes_read = idetape_add_chrdev_read_request(drive, ctl); |
| if (bytes_read <= 0) |
| goto finish; |
| temp = min((unsigned long)count, (unsigned long)bytes_read); |
| if (idetape_copy_stage_to_user(tape, buf, temp)) |
| ret = -EFAULT; |
| actually_read += temp; |
| tape->merge_stage_size = bytes_read-temp; |
| } |
| finish: |
| if (!actually_read && test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) { |
| debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); |
| |
| idetape_space_over_filemarks(drive, MTFSF, 1); |
| return 0; |
| } |
| |
| return ret ? ret : actually_read; |
| } |
| |
| static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| struct ide_tape_obj *tape = ide_tape_f(file); |
| ide_drive_t *drive = tape->drive; |
| ssize_t actually_written = 0; |
| ssize_t ret = 0; |
| u16 ctl = *(u16 *)&tape->caps[12]; |
| |
| /* The drive is write protected. */ |
| if (tape->write_prot) |
| return -EACCES; |
| |
| debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); |
| |
| /* Initialize write operation */ |
| if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
| if (tape->chrdev_dir == IDETAPE_DIR_READ) |
| idetape_discard_read_pipeline(drive, 1); |
| if (tape->merge_stage || tape->merge_stage_size) { |
| printk(KERN_ERR "ide-tape: merge_stage_size " |
| "should be 0 now\n"); |
| tape->merge_stage_size = 0; |
| } |
| tape->merge_stage = ide_tape_kmalloc_buffer(tape, 0, 0); |
| if (!tape->merge_stage) |
| return -ENOMEM; |
| tape->chrdev_dir = IDETAPE_DIR_WRITE; |
| idetape_init_merge_stage(tape); |
| |
| /* |
| * Issue a write 0 command to ensure that DSC handshake is |
| * switched from completion mode to buffer available mode. No |
| * point in issuing this if DSC overlap isn't supported, some |
| * drives (Seagate STT3401A) will return an error. |
| */ |
| if (drive->dsc_overlap) { |
| ssize_t retval = idetape_queue_rw_tail(drive, |
| REQ_IDETAPE_WRITE, 0, |
| tape->merge_stage->bh); |
| if (retval < 0) { |
| __idetape_kfree_stage(tape->merge_stage); |
| tape->merge_stage = NULL; |
| tape->chrdev_dir = IDETAPE_DIR_NONE; |
| return retval; |
| } |
| } |
| } |
| if (count == 0) |
| return (0); |
| if (tape->merge_stage_size) { |
| if (tape->merge_stage_size >= tape->buffer_size) { |
| printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); |
| tape->merge_stage_size = 0; |
| } |
| actually_written = min((unsigned int) |
| (tape->buffer_size - tape->merge_stage_size), |
| (unsigned int)count); |
| if (idetape_copy_stage_from_user(tape, buf, actually_written)) |
| ret = -EFAULT; |
| buf += actually_written; |
| tape->merge_stage_size += actually_written; |
| count -= actually_written; |
| |
| if (tape->merge_stage_size == tape->buffer_size) { |
| ssize_t retval; |
| tape->merge_stage_size = 0; |
| retval = idetape_add_chrdev_write_request(drive, ctl); |
| if (retval <= 0) |
| return (retval); |
| } |
| } |
| while (count >= tape->buffer_size) { |
| ssize_t retval; |
| if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) |
| ret = -EFAULT; |
| buf += tape->buffer_size; |
| count -= tape->buffer_size; |
| retval = idetape_add_chrdev_write_request(drive, ctl); |
| actually_written += tape->buffer_size; |
| if (retval <= 0) |
| return (retval); |
| } |
| if (count) { |
| actually_written += count; |
| if (idetape_copy_stage_from_user(tape, buf, count)) |
| ret = -EFAULT; |
| tape->merge_stage_size += count; |
| } |
| return ret ? ret : actually_written; |
| } |
| |
| static int idetape_write_filemark(ide_drive_t *drive) |
| { |
| struct ide_atapi_pc pc; |
| |
| /* Write a filemark */ |
| idetape_create_write_filemark_cmd(drive, &pc, 1); |
| if (idetape_queue_pc_tail(drive, &pc)) { |
| printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); |
| return -EIO; |
| } |
| return 0; |
| } |
| |
| /* |
| * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
| * requested. |
| * |
| * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
| * spacing over filemarks in the reverse direction. In this case, MTFSFM is also |
| * usually not supported. |
| * |
| * The following commands are currently not supported: |
| * |
| * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
| * MT_ST_WRITE_THRESHOLD. |
| */ |
| static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct ide_atapi_pc pc; |
| int i, retval; |
| |
| debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", |
| mt_op, mt_count); |
| |
| switch (mt_op) { |
| case MTFSF: |
| case MTFSFM: |
| case MTBSF: |
| case MTBSFM: |
| if (!mt_count) |
| return 0; |
| return idetape_space_over_filemarks(drive, mt_op, mt_count); |
| default: |
| break; |
| } |
| |
| switch (mt_op) { |
| case MTWEOF: |
| if (tape->write_prot) |
| return -EACCES; |
| idetape_discard_read_pipeline(drive, 1); |
| for (i = 0; i < mt_count; i++) { |
| retval = idetape_write_filemark(drive); |
| if (retval) |
| return retval; |
| } |
| return 0; |
| case MTREW: |
| idetape_discard_read_pipeline(drive, 0); |
| if (idetape_rewind_tape(drive)) |
| return -EIO; |
| return 0; |
| case MTLOAD: |
| idetape_discard_read_pipeline(drive, 0); |
| idetape_create_load_unload_cmd(drive, &pc, |
| IDETAPE_LU_LOAD_MASK); |
| return idetape_queue_pc_tail(drive, &pc); |
| case MTUNLOAD: |
| case MTOFFL: |
| /* |
| * If door is locked, attempt to unlock before |
| * attempting to eject. |
| */ |
| if (tape->door_locked) { |
| if (idetape_create_prevent_cmd(drive, &pc, 0)) |
| if (!idetape_queue_pc_tail(drive, &pc)) |
| tape->door_locked = DOOR_UNLOCKED; |
| } |
| idetape_discard_read_pipeline(drive, 0); |
| idetape_create_load_unload_cmd(drive, &pc, |
| !IDETAPE_LU_LOAD_MASK); |
| retval = idetape_queue_pc_tail(drive, &pc); |
| if (!retval) |
| clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags); |
| return retval; |
| case MTNOP: |
| idetape_discard_read_pipeline(drive, 0); |
| return idetape_flush_tape_buffers(drive); |
| case MTRETEN: |
| idetape_discard_read_pipeline(drive, 0); |
| idetape_create_load_unload_cmd(drive, &pc, |
| IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); |
| return idetape_queue_pc_tail(drive, &pc); |
| case MTEOM: |
| idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); |
| return idetape_queue_pc_tail(drive, &pc); |
| case MTERASE: |
| (void)idetape_rewind_tape(drive); |
| idetape_create_erase_cmd(&pc); |
| return idetape_queue_pc_tail(drive, &pc); |
| case MTSETBLK: |
| if (mt_count) { |
| if (mt_count < tape->blk_size || |
| mt_count % tape->blk_size) |
| return -EIO; |
| tape->user_bs_factor = mt_count / tape->blk_size; |
| clear_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags); |
| } else |
| set_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags); |
| return 0; |
| case MTSEEK: |
| idetape_discard_read_pipeline(drive, 0); |
| return idetape_position_tape(drive, |
| mt_count * tape->user_bs_factor, tape->partition, 0); |
| case MTSETPART: |
| idetape_discard_read_pipeline(drive, 0); |
| return idetape_position_tape(drive, 0, mt_count, 0); |
| case MTFSR: |
| case MTBSR: |
| case MTLOCK: |
| if (!idetape_create_prevent_cmd(drive, &pc, 1)) |
| return 0; |
| retval = idetape_queue_pc_tail(drive, &pc); |
| if (retval) |
| return retval; |
| tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
| return 0; |
| case MTUNLOCK: |
| if (!idetape_create_prevent_cmd(drive, &pc, 0)) |
| return 0; |
| retval = idetape_queue_pc_tail(drive, &pc); |
| if (retval) |
| return retval; |
| tape->door_locked = DOOR_UNLOCKED; |
| return 0; |
| default: |
| printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", |
| mt_op); |
| return -EIO; |
| } |
| } |
| |
| /* |
| * Our character device ioctls. General mtio.h magnetic io commands are |
| * supported here, and not in the corresponding block interface. Our own |
| * ide-tape ioctls are supported on both interfaces. |
| */ |
| static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, |
| unsigned int cmd, unsigned long arg) |
| { |
| struct ide_tape_obj *tape = ide_tape_f(file); |
| ide_drive_t *drive = tape->drive; |
| struct mtop mtop; |
| struct mtget mtget; |
| struct mtpos mtpos; |
| int block_offset = 0, position = tape->first_frame; |
| void __user *argp = (void __user *)arg; |
| |
| debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); |
| |
| if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
| idetape_empty_write_pipeline(drive); |
| idetape_flush_tape_buffers(drive); |
| } |
| if (cmd == MTIOCGET || cmd == MTIOCPOS) { |
| block_offset = tape->merge_stage_size / |
| (tape->blk_size * tape->user_bs_factor); |
| position = idetape_read_position(drive); |
| if (position < 0) |
| return -EIO; |
| } |
| switch (cmd) { |
| case MTIOCTOP: |
| if (copy_from_user(&mtop, argp, sizeof(struct mtop))) |
| return -EFAULT; |
| return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); |
| case MTIOCGET: |
| memset(&mtget, 0, sizeof(struct mtget)); |
| mtget.mt_type = MT_ISSCSI2; |
| mtget.mt_blkno = position / tape->user_bs_factor - block_offset; |
| mtget.mt_dsreg = |
| ((tape->blk_size * tape->user_bs_factor) |
| << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; |
| |
| if (tape->drv_write_prot) |
| mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); |
| |
| if (copy_to_user(argp, &mtget, sizeof(struct mtget))) |
| return -EFAULT; |
| return 0; |
| case MTIOCPOS: |
| mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; |
| if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) |
| return -EFAULT; |
| return 0; |
| default: |
| if (tape->chrdev_dir == IDETAPE_DIR_READ) |
| idetape_discard_read_pipeline(drive, 1); |
| return idetape_blkdev_ioctl(drive, cmd, arg); |
| } |
| } |
| |
| /* |
| * Do a mode sense page 0 with block descriptor and if it succeeds set the tape |
| * block size with the reported value. |
| */ |
| static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct ide_atapi_pc pc; |
| |
| idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); |
| if (idetape_queue_pc_tail(drive, &pc)) { |
| printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); |
| if (tape->blk_size == 0) { |
| printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
| "block size, assuming 32k\n"); |
| tape->blk_size = 32768; |
| } |
| return; |
| } |
| tape->blk_size = (pc.buf[4 + 5] << 16) + |
| (pc.buf[4 + 6] << 8) + |
| pc.buf[4 + 7]; |
| tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; |
| } |
| |
| static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
| { |
| unsigned int minor = iminor(inode), i = minor & ~0xc0; |
| ide_drive_t *drive; |
| idetape_tape_t *tape; |
| struct ide_atapi_pc pc; |
| int retval; |
| |
| if (i >= MAX_HWIFS * MAX_DRIVES) |
| return -ENXIO; |
| |
| tape = ide_tape_chrdev_get(i); |
| if (!tape) |
| return -ENXIO; |
| |
| debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
| |
| /* |
| * We really want to do nonseekable_open(inode, filp); here, but some |
| * versions of tar incorrectly call lseek on tapes and bail out if that |
| * fails. So we disallow pread() and pwrite(), but permit lseeks. |
| */ |
| filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); |
| |
| drive = tape->drive; |
| |
| filp->private_data = tape; |
| |
| if (test_and_set_bit(IDETAPE_FLAG_BUSY, &tape->flags)) { |
| retval = -EBUSY; |
| goto out_put_tape; |
| } |
| |
| retval = idetape_wait_ready(drive, 60 * HZ); |
| if (retval) { |
| clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
| printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
| goto out_put_tape; |
| } |
| |
| idetape_read_position(drive); |
| if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags)) |
| (void)idetape_rewind_tape(drive); |
| |
| /* Read block size and write protect status from drive. */ |
| ide_tape_get_bsize_from_bdesc(drive); |
| |
| /* Set write protect flag if device is opened as read-only. */ |
| if ((filp->f_flags & O_ACCMODE) == O_RDONLY) |
| tape->write_prot = 1; |
| else |
| tape->write_prot = tape->drv_write_prot; |
| |
| /* Make sure drive isn't write protected if user wants to write. */ |
| if (tape->write_prot) { |
| if ((filp->f_flags & O_ACCMODE) == O_WRONLY || |
| (filp->f_flags & O_ACCMODE) == O_RDWR) { |
| clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
| retval = -EROFS; |
| goto out_put_tape; |
| } |
| } |
| |
| /* Lock the tape drive door so user can't eject. */ |
| if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
| if (idetape_create_prevent_cmd(drive, &pc, 1)) { |
| if (!idetape_queue_pc_tail(drive, &pc)) { |
| if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) |
| tape->door_locked = DOOR_LOCKED; |
| } |
| } |
| } |
| return 0; |
| |
| out_put_tape: |
| ide_tape_put(tape); |
| return retval; |
| } |
| |
| static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| idetape_empty_write_pipeline(drive); |
| tape->merge_stage = ide_tape_kmalloc_buffer(tape, 1, 0); |
| if (tape->merge_stage != NULL) { |
| idetape_pad_zeros(drive, tape->blk_size * |
| (tape->user_bs_factor - 1)); |
| __idetape_kfree_stage(tape->merge_stage); |
| tape->merge_stage = NULL; |
| } |
| idetape_write_filemark(drive); |
| idetape_flush_tape_buffers(drive); |
| idetape_flush_tape_buffers(drive); |
| } |
| |
| static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
| { |
| struct ide_tape_obj *tape = ide_tape_f(filp); |
| ide_drive_t *drive = tape->drive; |
| struct ide_atapi_pc pc; |
| unsigned int minor = iminor(inode); |
| |
| lock_kernel(); |
| tape = drive->driver_data; |
| |
| debug_log(DBG_CHRDEV, "Enter %s\n", __func__); |
| |
| if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
| idetape_write_release(drive, minor); |
| if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
| if (minor < 128) |
| idetape_discard_read_pipeline(drive, 1); |
| } |
| |
| if (minor < 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags)) |
| (void) idetape_rewind_tape(drive); |
| if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
| if (tape->door_locked == DOOR_LOCKED) { |
| if (idetape_create_prevent_cmd(drive, &pc, 0)) { |
| if (!idetape_queue_pc_tail(drive, &pc)) |
| tape->door_locked = DOOR_UNLOCKED; |
| } |
| } |
| } |
| clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); |
| ide_tape_put(tape); |
| unlock_kernel(); |
| return 0; |
| } |
| |
| /* |
| * check the contents of the ATAPI IDENTIFY command results. We return: |
| * |
| * 1 - If the tape can be supported by us, based on the information we have so |
| * far. |
| * |
| * 0 - If this tape driver is not currently supported by us. |
| */ |
| static int idetape_identify_device(ide_drive_t *drive) |
| { |
| u8 gcw[2], protocol, device_type, removable, packet_size; |
| |
| if (drive->id_read == 0) |
| return 1; |
| |
| *((unsigned short *) &gcw) = drive->id->config; |
| |
| protocol = (gcw[1] & 0xC0) >> 6; |
| device_type = gcw[1] & 0x1F; |
| removable = !!(gcw[0] & 0x80); |
| packet_size = gcw[0] & 0x3; |
| |
| /* Check that we can support this device */ |
| if (protocol != 2) |
| printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n", |
| protocol); |
| else if (device_type != 1) |
| printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set " |
| "to tape\n", device_type); |
| else if (!removable) |
| printk(KERN_ERR "ide-tape: The removable flag is not set\n"); |
| else if (packet_size != 0) { |
| printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12" |
| " bytes\n", packet_size); |
| } else |
| return 1; |
| return 0; |
| } |
| |
| static void idetape_get_inquiry_results(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct ide_atapi_pc pc; |
| char fw_rev[6], vendor_id[10], product_id[18]; |
| |
| idetape_create_inquiry_cmd(&pc); |
| if (idetape_queue_pc_tail(drive, &pc)) { |
| printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
| tape->name); |
| return; |
| } |
| memcpy(vendor_id, &pc.buf[8], 8); |
| memcpy(product_id, &pc.buf[16], 16); |
| memcpy(fw_rev, &pc.buf[32], 4); |
| |
| ide_fixstring(vendor_id, 10, 0); |
| ide_fixstring(product_id, 18, 0); |
| ide_fixstring(fw_rev, 6, 0); |
| |
| printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", |
| drive->name, tape->name, vendor_id, product_id, fw_rev); |
| } |
| |
| /* |
| * Ask the tape about its various parameters. In particular, we will adjust our |
| * data transfer buffer size to the recommended value as returned by the tape. |
| */ |
| static void idetape_get_mode_sense_results(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct ide_atapi_pc pc; |
| u8 *caps; |
| u8 speed, max_speed; |
| |
| idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
| if (idetape_queue_pc_tail(drive, &pc)) { |
| printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
| " some default values\n"); |
| tape->blk_size = 512; |
| put_unaligned(52, (u16 *)&tape->caps[12]); |
| put_unaligned(540, (u16 *)&tape->caps[14]); |
| put_unaligned(6*52, (u16 *)&tape->caps[16]); |
| return; |
| } |
| caps = pc.buf + 4 + pc.buf[3]; |
| |
| /* convert to host order and save for later use */ |
| speed = be16_to_cpu(*(u16 *)&caps[14]); |
| max_speed = be16_to_cpu(*(u16 *)&caps[8]); |
| |
| put_unaligned(max_speed, (u16 *)&caps[8]); |
| put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]); |
| put_unaligned(speed, (u16 *)&caps[14]); |
| put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]); |
| |
| if (!speed) { |
| printk(KERN_INFO "ide-tape: %s: invalid tape speed " |
| "(assuming 650KB/sec)\n", drive->name); |
| put_unaligned(650, (u16 *)&caps[14]); |
| } |
| if (!max_speed) { |
| printk(KERN_INFO "ide-tape: %s: invalid max_speed " |
| "(assuming 650KB/sec)\n", drive->name); |
| put_unaligned(650, (u16 *)&caps[8]); |
| } |
| |
| memcpy(&tape->caps, caps, 20); |
| if (caps[7] & 0x02) |
| tape->blk_size = 512; |
| else if (caps[7] & 0x04) |
| tape->blk_size = 1024; |
| } |
| |
| #ifdef CONFIG_IDE_PROC_FS |
| static void idetape_add_settings(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff, |
| 1, 2, (u16 *)&tape->caps[16], NULL); |
| ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff, |
| 1, 1, (u16 *)&tape->caps[14], NULL); |
| ide_add_setting(drive, "buffer_size", SETTING_READ, TYPE_INT, 0, 0xffff, |
| 1, 1024, &tape->buffer_size, NULL); |
| ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN, |
| IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq, |
| NULL); |
| ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, |
| 1, &drive->dsc_overlap, NULL); |
| ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, |
| 1, 1, &tape->avg_speed, NULL); |
| ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1, |
| 1, &tape->debug_mask, NULL); |
| } |
| #else |
| static inline void idetape_add_settings(ide_drive_t *drive) { ; } |
| #endif |
| |
| /* |
| * The function below is called to: |
| * |
| * 1. Initialize our various state variables. |
| * 2. Ask the tape for its capabilities. |
| * 3. Allocate a buffer which will be used for data transfer. The buffer size |
| * is chosen based on the recommendation which we received in step 2. |
| * |
| * Note that at this point ide.c already assigned us an irq, so that we can |
| * queue requests here and wait for their completion. |
| */ |
| static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
| { |
| unsigned long t; |
| int speed; |
| int buffer_size; |
| u8 gcw[2]; |
| u16 *ctl = (u16 *)&tape->caps[12]; |
| |
| spin_lock_init(&tape->lock); |
| drive->dsc_overlap = 1; |
| if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
| printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", |
| tape->name); |
| drive->dsc_overlap = 0; |
| } |
| /* Seagate Travan drives do not support DSC overlap. */ |
| if (strstr(drive->id->model, "Seagate STT3401")) |
| drive->dsc_overlap = 0; |
| tape->minor = minor; |
| tape->name[0] = 'h'; |
| tape->name[1] = 't'; |
| tape->name[2] = '0' + minor; |
| tape->chrdev_dir = IDETAPE_DIR_NONE; |
| tape->pc = tape->pc_stack; |
| *((unsigned short *) &gcw) = drive->id->config; |
| |
| /* Command packet DRQ type */ |
| if (((gcw[0] & 0x60) >> 5) == 1) |
| set_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags); |
| |
| idetape_get_inquiry_results(drive); |
| idetape_get_mode_sense_results(drive); |
| ide_tape_get_bsize_from_bdesc(drive); |
| tape->user_bs_factor = 1; |
| tape->buffer_size = *ctl * tape->blk_size; |
| while (tape->buffer_size > 0xffff) { |
| printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
| *ctl /= 2; |
| tape->buffer_size = *ctl * tape->blk_size; |
| } |
| buffer_size = tape->buffer_size; |
| tape->pages_per_buffer = buffer_size / PAGE_SIZE; |
| if (buffer_size % PAGE_SIZE) { |
| tape->pages_per_buffer++; |
| tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; |
| } |
| |
| /* select the "best" DSC read/write polling freq */ |
| speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
| |
| t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
| |
| /* |
| * Ensure that the number we got makes sense; limit it within |
| * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. |
| */ |
| tape->best_dsc_rw_freq = max_t(unsigned long, |
| min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), |
| IDETAPE_DSC_RW_MIN); |
| printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
| "%lums tDSC%s\n", |
| drive->name, tape->name, *(u16 *)&tape->caps[14], |
| (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
| tape->buffer_size / 1024, |
| tape->best_dsc_rw_freq * 1000 / HZ, |
| drive->using_dma ? ", DMA":""); |
| |
| idetape_add_settings(drive); |
| } |
| |
| static void ide_tape_remove(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| ide_proc_unregister_driver(drive, tape->driver); |
| |
| ide_unregister_region(tape->disk); |
| |
| ide_tape_put(tape); |
| } |
| |
| static void ide_tape_release(struct kref *kref) |
| { |
| struct ide_tape_obj *tape = to_ide_tape(kref); |
| ide_drive_t *drive = tape->drive; |
| struct gendisk *g = tape->disk; |
| |
| BUG_ON(tape->merge_stage_size); |
| |
| drive->dsc_overlap = 0; |
| drive->driver_data = NULL; |
| device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
| device_destroy(idetape_sysfs_class, |
| MKDEV(IDETAPE_MAJOR, tape->minor + 128)); |
| idetape_devs[tape->minor] = NULL; |
| g->private_data = NULL; |
| put_disk(g); |
| kfree(tape); |
| } |
| |
| #ifdef CONFIG_IDE_PROC_FS |
| static int proc_idetape_read_name |
| (char *page, char **start, off_t off, int count, int *eof, void *data) |
| { |
| ide_drive_t *drive = (ide_drive_t *) data; |
| idetape_tape_t *tape = drive->driver_data; |
| char *out = page; |
| int len; |
| |
| len = sprintf(out, "%s\n", tape->name); |
| PROC_IDE_READ_RETURN(page, start, off, count, eof, len); |
| } |
| |
| static ide_proc_entry_t idetape_proc[] = { |
| { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, |
| { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, |
| { NULL, 0, NULL, NULL } |
| }; |
| #endif |
| |
| static int ide_tape_probe(ide_drive_t *); |
| |
| static ide_driver_t idetape_driver = { |
| .gen_driver = { |
| .owner = THIS_MODULE, |
| .name = "ide-tape", |
| .bus = &ide_bus_type, |
| }, |
| .probe = ide_tape_probe, |
| .remove = ide_tape_remove, |
| .version = IDETAPE_VERSION, |
| .media = ide_tape, |
| .supports_dsc_overlap = 1, |
| .do_request = idetape_do_request, |
| .end_request = idetape_end_request, |
| .error = __ide_error, |
| .abort = __ide_abort, |
| #ifdef CONFIG_IDE_PROC_FS |
| .proc = idetape_proc, |
| #endif |
| }; |
| |
| /* Our character device supporting functions, passed to register_chrdev. */ |
| static const struct file_operations idetape_fops = { |
| .owner = THIS_MODULE, |
| .read = idetape_chrdev_read, |
| .write = idetape_chrdev_write, |
| .ioctl = idetape_chrdev_ioctl, |
| .open = idetape_chrdev_open, |
| .release = idetape_chrdev_release, |
| }; |
| |
| static int idetape_open(struct inode *inode, struct file *filp) |
| { |
| struct gendisk *disk = inode->i_bdev->bd_disk; |
| struct ide_tape_obj *tape; |
| |
| tape = ide_tape_get(disk); |
| if (!tape) |
| return -ENXIO; |
| |
| return 0; |
| } |
| |
| static int idetape_release(struct inode *inode, struct file *filp) |
| { |
| struct gendisk *disk = inode->i_bdev->bd_disk; |
| struct ide_tape_obj *tape = ide_tape_g(disk); |
| |
| ide_tape_put(tape); |
| |
| return 0; |
| } |
| |
| static int idetape_ioctl(struct inode *inode, struct file *file, |
| unsigned int cmd, unsigned long arg) |
| { |
| struct block_device *bdev = inode->i_bdev; |
| struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); |
| ide_drive_t *drive = tape->drive; |
| int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); |
| if (err == -EINVAL) |
| err = idetape_blkdev_ioctl(drive, cmd, arg); |
| return err; |
| } |
| |
| static struct block_device_operations idetape_block_ops = { |
| .owner = THIS_MODULE, |
| .open = idetape_open, |
| .release = idetape_release, |
| .ioctl = idetape_ioctl, |
| }; |
| |
| static int ide_tape_probe(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape; |
| struct gendisk *g; |
| int minor; |
| |
| if (!strstr("ide-tape", drive->driver_req)) |
| goto failed; |
| if (!drive->present) |
| goto failed; |
| if (drive->media != ide_tape) |
| goto failed; |
| if (!idetape_identify_device(drive)) { |
| printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
| " the driver\n", drive->name); |
| goto failed; |
| } |
| if (drive->scsi) { |
| printk(KERN_INFO "ide-tape: passing drive %s to ide-scsi" |
| " emulation.\n", drive->name); |
| goto failed; |
| } |
| tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
| if (tape == NULL) { |
| printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
| drive->name); |
| goto failed; |
| } |
| |
| g = alloc_disk(1 << PARTN_BITS); |
| if (!g) |
| goto out_free_tape; |
| |
| ide_init_disk(g, drive); |
| |
| ide_proc_register_driver(drive, &idetape_driver); |
| |
| kref_init(&tape->kref); |
| |
| tape->drive = drive; |
| tape->driver = &idetape_driver; |
| tape->disk = g; |
| |
| g->private_data = &tape->driver; |
| |
| drive->driver_data = tape; |
| |
| mutex_lock(&idetape_ref_mutex); |
| for (minor = 0; idetape_devs[minor]; minor++) |
| ; |
| idetape_devs[minor] = tape; |
| mutex_unlock(&idetape_ref_mutex); |
| |
| idetape_setup(drive, tape, minor); |
| |
| device_create(idetape_sysfs_class, &drive->gendev, |
| MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name); |
| device_create(idetape_sysfs_class, &drive->gendev, |
| MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name); |
| |
| g->fops = &idetape_block_ops; |
| ide_register_region(g); |
| |
| return 0; |
| |
| out_free_tape: |
| kfree(tape); |
| failed: |
| return -ENODEV; |
| } |
| |
| static void __exit idetape_exit(void) |
| { |
| driver_unregister(&idetape_driver.gen_driver); |
| class_destroy(idetape_sysfs_class); |
| unregister_chrdev(IDETAPE_MAJOR, "ht"); |
| } |
| |
| static int __init idetape_init(void) |
| { |
| int error = 1; |
| idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); |
| if (IS_ERR(idetape_sysfs_class)) { |
| idetape_sysfs_class = NULL; |
| printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); |
| error = -EBUSY; |
| goto out; |
| } |
| |
| if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
| printk(KERN_ERR "ide-tape: Failed to register chrdev" |
| " interface\n"); |
| error = -EBUSY; |
| goto out_free_class; |
| } |
| |
| error = driver_register(&idetape_driver.gen_driver); |
| if (error) |
| goto out_free_driver; |
| |
| return 0; |
| |
| out_free_driver: |
| driver_unregister(&idetape_driver.gen_driver); |
| out_free_class: |
| class_destroy(idetape_sysfs_class); |
| out: |
| return error; |
| } |
| |
| MODULE_ALIAS("ide:*m-tape*"); |
| module_init(idetape_init); |
| module_exit(idetape_exit); |
| MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); |
| MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
| MODULE_LICENSE("GPL"); |