diff options
Diffstat (limited to 'drivers/char/ftape/lowlevel/ftape-format.c')
| -rw-r--r-- | drivers/char/ftape/lowlevel/ftape-format.c | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/drivers/char/ftape/lowlevel/ftape-format.c b/drivers/char/ftape/lowlevel/ftape-format.c new file mode 100644 index 000000000000..5dd4c59a3f34 --- /dev/null +++ b/drivers/char/ftape/lowlevel/ftape-format.c @@ -0,0 +1,344 @@ +/* + * Copyright (C) 1997 Claus-Justus Heine. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; see the file COPYING. If not, write to + the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + + * + * $Source: /homes/cvs/ftape-stacked/ftape/lowlevel/ftape-format.c,v $ + * $Revision: 1.2.4.1 $ + * $Date: 1997/11/14 16:05:39 $ + * + * This file contains the code to support formatting of floppy + * tape cartridges with the QIC-40/80/3010/3020 floppy-tape + * driver "ftape" for Linux. + */ + +#include <linux/string.h> +#include <linux/errno.h> + +#include <linux/ftape.h> +#include <linux/qic117.h> +#include "../lowlevel/ftape-tracing.h" +#include "../lowlevel/ftape-io.h" +#include "../lowlevel/ftape-ctl.h" +#include "../lowlevel/ftape-rw.h" +#include "../lowlevel/ftape-ecc.h" +#include "../lowlevel/ftape-bsm.h" +#include "../lowlevel/ftape-format.h" + +#if defined(TESTING) +#define FT_FMT_SEGS_PER_BUF 50 +#else +#define FT_FMT_SEGS_PER_BUF (FT_BUFF_SIZE/(4*FT_SECTORS_PER_SEGMENT)) +#endif + +static spinlock_t ftape_format_lock; + +/* + * first segment of the new buffer + */ +static int switch_segment; + +/* + * at most 256 segments fit into one 32 kb buffer. Even TR-1 cartridges have + * more than this many segments per track, so better be careful. + * + * buffer_struct *buff: buffer to store the formatting coordinates in + * int start: starting segment for this buffer. + * int spt: segments per track + * + * Note: segment ids are relative to the start of the track here. + */ +static void setup_format_buffer(buffer_struct *buff, int start, int spt, + __u8 gap3) +{ + int to_do = spt - start; + TRACE_FUN(ft_t_flow); + + if (to_do > FT_FMT_SEGS_PER_BUF) { + to_do = FT_FMT_SEGS_PER_BUF; + } + buff->ptr = buff->address; + buff->remaining = to_do * FT_SECTORS_PER_SEGMENT; /* # sectors */ + buff->bytes = buff->remaining * 4; /* need 4 bytes per sector */ + buff->gap3 = gap3; + buff->segment_id = start; + buff->next_segment = start + to_do; + if (buff->next_segment >= spt) { + buff->next_segment = 0; /* 0 means: stop runner */ + } + buff->status = waiting; /* tells the isr that it can use + * this buffer + */ + TRACE_EXIT; +} + + +/* + * start formatting a new track. + */ +int ftape_format_track(const unsigned int track, const __u8 gap3) +{ + unsigned long flags; + buffer_struct *tail, *head; + int status; + TRACE_FUN(ft_t_flow); + + TRACE_CATCH(ftape_ready_wait(ftape_timeout.pause, &status),); + if (track & 1) { + if (!(status & QIC_STATUS_AT_EOT)) { + TRACE_CATCH(ftape_seek_to_eot(),); + } + } else { + if (!(status & QIC_STATUS_AT_BOT)) { + TRACE_CATCH(ftape_seek_to_bot(),); + } + } + ftape_abort_operation(); /* this sets ft_head = ft_tail = 0 */ + ftape_set_state(formatting); + + TRACE(ft_t_noise, + "Formatting track %d, logical: from segment %d to %d", + track, track * ft_segments_per_track, + (track + 1) * ft_segments_per_track - 1); + + /* + * initialize the buffer switching protocol for this track + */ + head = ftape_get_buffer(ft_queue_head); /* tape isn't running yet */ + tail = ftape_get_buffer(ft_queue_tail); /* tape isn't running yet */ + switch_segment = 0; + do { + FT_SIGNAL_EXIT(_DONT_BLOCK); + setup_format_buffer(tail, switch_segment, + ft_segments_per_track, gap3); + switch_segment = tail->next_segment; + } while ((switch_segment != 0) && + ((tail = ftape_next_buffer(ft_queue_tail)) != head)); + /* go */ + head->status = formatting; + TRACE_CATCH(ftape_seek_head_to_track(track),); + TRACE_CATCH(ftape_command(QIC_LOGICAL_FORWARD),); + spin_lock_irqsave(&ftape_format_lock, flags); + TRACE_CATCH(fdc_setup_formatting(head), restore_flags(flags)); + spin_unlock_irqrestore(&ftape_format_lock, flags); + TRACE_EXIT 0; +} + +/* return segment id of segment currently being formatted and do the + * buffer switching stuff. + */ +int ftape_format_status(unsigned int *segment_id) +{ + buffer_struct *tail = ftape_get_buffer(ft_queue_tail); + int result; + TRACE_FUN(ft_t_flow); + + while (switch_segment != 0 && + ftape_get_buffer(ft_queue_head) != tail) { + FT_SIGNAL_EXIT(_DONT_BLOCK); + /* need more buffers, first wait for empty buffer + */ + TRACE_CATCH(ftape_wait_segment(formatting),); + /* don't worry for gap3. If we ever hit this piece of code, + * then all buffer already have the correct gap3 set! + */ + setup_format_buffer(tail, switch_segment, + ft_segments_per_track, tail->gap3); + switch_segment = tail->next_segment; + if (switch_segment != 0) { + tail = ftape_next_buffer(ft_queue_tail); + } + } + /* should runner stop ? + */ + if (ft_runner_status == aborting || ft_runner_status == do_abort) { + buffer_struct *head = ftape_get_buffer(ft_queue_head); + TRACE(ft_t_warn, "Error formatting segment %d", + ftape_get_buffer(ft_queue_head)->segment_id); + (void)ftape_abort_operation(); + TRACE_EXIT (head->status != error) ? -EAGAIN : -EIO; + } + /* + * don't care if the timer expires, this is just kind of a + * "select" operation that lets the calling process sleep + * until something has happened + */ + if (fdc_interrupt_wait(5 * FT_SECOND) < 0) { + TRACE(ft_t_noise, "End of track %d at segment %d", + ft_location.track, + ftape_get_buffer(ft_queue_head)->segment_id); + result = 1; /* end of track, unlock module */ + } else { + result = 0; + } + /* + * the calling process should use the seg id to determine + * which parts of the dma buffers can be safely overwritten + * with new data. + */ + *segment_id = ftape_get_buffer(ft_queue_head)->segment_id; + /* + * Internally we start counting segment ids from the start of + * each track when formatting, but externally we keep them + * relative to the start of the tape: + */ + *segment_id += ft_location.track * ft_segments_per_track; + TRACE_EXIT result; +} + +/* + * The segment id is relative to the start of the tape + */ +int ftape_verify_segment(const unsigned int segment_id, SectorMap *bsm) +{ + int result; + int verify_done = 0; + TRACE_FUN(ft_t_flow); + + TRACE(ft_t_noise, "Verifying segment %d", segment_id); + + if (ft_driver_state != verifying) { + TRACE(ft_t_noise, "calling ftape_abort_operation"); + if (ftape_abort_operation() < 0) { + TRACE(ft_t_err, "ftape_abort_operation failed"); + TRACE_EXIT -EIO; + } + } + *bsm = 0x00000000; + ftape_set_state(verifying); + for (;;) { + buffer_struct *tail; + /* + * Allow escape from this loop on signal + */ + FT_SIGNAL_EXIT(_DONT_BLOCK); + /* + * Search all full buffers for the first matching the + * wanted segment. Clear other buffers on the fly. + */ + tail = ftape_get_buffer(ft_queue_tail); + while (!verify_done && tail->status == done) { + /* + * Allow escape from this loop on signal ! + */ + FT_SIGNAL_EXIT(_DONT_BLOCK); + if (tail->segment_id == segment_id) { + /* If out buffer is already full, + * return its contents. + */ + TRACE(ft_t_flow, "found segment in cache: %d", + segment_id); + if ((tail->soft_error_map | + tail->hard_error_map) != 0) { + TRACE(ft_t_info,"bsm[%d] = 0x%08lx", + segment_id, + (unsigned long) + (tail->soft_error_map | + tail->hard_error_map)); + *bsm = (tail->soft_error_map | + tail->hard_error_map); + } + verify_done = 1; + } else { + TRACE(ft_t_flow,"zapping segment in cache: %d", + tail->segment_id); + } + tail->status = waiting; + tail = ftape_next_buffer(ft_queue_tail); + } + if (!verify_done && tail->status == verifying) { + if (tail->segment_id == segment_id) { + switch(ftape_wait_segment(verifying)) { + case 0: + break; + case -EINTR: + TRACE_ABORT(-EINTR, ft_t_warn, + "interrupted by " + "non-blockable signal"); + break; + default: + ftape_abort_operation(); + ftape_set_state(verifying); + /* be picky */ + TRACE_ABORT(-EIO, ft_t_warn, + "wait_segment failed"); + } + } else { + /* We're reading the wrong segment, + * stop runner. + */ + TRACE(ft_t_noise, "verifying wrong segment"); + ftape_abort_operation(); + ftape_set_state(verifying); + } + } + /* should runner stop ? + */ + if (ft_runner_status == aborting) { + buffer_struct *head = ftape_get_buffer(ft_queue_head); + if (head->status == error || + head->status == verifying) { + /* no data or overrun error */ + head->status = waiting; + } + TRACE_CATCH(ftape_dumb_stop(),); + } else { + /* If just passed last segment on tape: wait + * for BOT or EOT mark. Sets ft_runner_status to + * idle if at lEOT and successful + */ + TRACE_CATCH(ftape_handle_logical_eot(),); + } + if (verify_done) { + TRACE_EXIT 0; + } + /* Now at least one buffer is idle! + * Restart runner & tape if needed. + */ + /* We could optimize the following a little bit. We know that + * the bad sector map is empty. + */ + tail = ftape_get_buffer(ft_queue_tail); + if (tail->status == waiting) { + buffer_struct *head = ftape_get_buffer(ft_queue_head); + + ftape_setup_new_segment(head, segment_id, -1); + ftape_calc_next_cluster(head); + if (ft_runner_status == idle) { + result = ftape_start_tape(segment_id, + head->sector_offset); + switch(result) { + case 0: + break; + case -ETIME: + case -EINTR: + TRACE_ABORT(result, ft_t_err, "Error: " + "segment %d unreachable", + segment_id); + break; + default: + *bsm = EMPTY_SEGMENT; + TRACE_EXIT 0; + break; + } + } + head->status = verifying; + fdc_setup_read_write(head, FDC_VERIFY); + } + } + /* not reached */ + TRACE_EXIT -EIO; +} |