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1275 |
phoenix |
/*
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* Copyright (C) 1997 Claus-Justus Heine.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Source: /home/marcus/revision_ctrl_test/oc_cvs/cvs/or1k/linux/linux-2.4/drivers/char/ftape/lowlevel/ftape-format.c,v $
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* $Revision: 1.1.1.1 $
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* $Date: 2004-04-15 02:02:39 $
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*
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* This file contains the code to support formatting of floppy
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* tape cartridges with the QIC-40/80/3010/3020 floppy-tape
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* driver "ftape" for Linux.
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*/
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/ftape.h>
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#include <linux/qic117.h>
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#include "../lowlevel/ftape-tracing.h"
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#include "../lowlevel/ftape-io.h"
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#include "../lowlevel/ftape-ctl.h"
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#include "../lowlevel/ftape-rw.h"
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#include "../lowlevel/ftape-ecc.h"
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#include "../lowlevel/ftape-bsm.h"
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#include "../lowlevel/ftape-format.h"
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#if defined(TESTING)
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#define FT_FMT_SEGS_PER_BUF 50
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#else
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#define FT_FMT_SEGS_PER_BUF (FT_BUFF_SIZE/(4*FT_SECTORS_PER_SEGMENT))
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#endif
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/*
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* first segment of the new buffer
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*/
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static int switch_segment;
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/*
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* at most 256 segments fit into one 32 kb buffer. Even TR-1 cartridges have
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* more than this many segments per track, so better be careful.
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*
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* buffer_struct *buff: buffer to store the formatting coordinates in
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* int start: starting segment for this buffer.
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* int spt: segments per track
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*
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* Note: segment ids are relative to the start of the track here.
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*/
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static void setup_format_buffer(buffer_struct *buff, int start, int spt,
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__u8 gap3)
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{
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int to_do = spt - start;
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TRACE_FUN(ft_t_flow);
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if (to_do > FT_FMT_SEGS_PER_BUF) {
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to_do = FT_FMT_SEGS_PER_BUF;
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}
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buff->ptr = buff->address;
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buff->remaining = to_do * FT_SECTORS_PER_SEGMENT; /* # sectors */
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buff->bytes = buff->remaining * 4; /* need 4 bytes per sector */
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buff->gap3 = gap3;
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buff->segment_id = start;
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buff->next_segment = start + to_do;
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if (buff->next_segment >= spt) {
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buff->next_segment = 0; /* 0 means: stop runner */
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}
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buff->status = waiting; /* tells the isr that it can use
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* this buffer
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*/
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TRACE_EXIT;
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}
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/*
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* start formatting a new track.
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*/
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int ftape_format_track(const unsigned int track, const __u8 gap3)
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{
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unsigned long flags;
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buffer_struct *tail, *head;
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int status;
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TRACE_FUN(ft_t_flow);
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TRACE_CATCH(ftape_ready_wait(ftape_timeout.pause, &status),);
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if (track & 1) {
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if (!(status & QIC_STATUS_AT_EOT)) {
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TRACE_CATCH(ftape_seek_to_eot(),);
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}
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} else {
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if (!(status & QIC_STATUS_AT_BOT)) {
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TRACE_CATCH(ftape_seek_to_bot(),);
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}
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}
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ftape_abort_operation(); /* this sets ft_head = ft_tail = 0 */
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ftape_set_state(formatting);
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TRACE(ft_t_noise,
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"Formatting track %d, logical: from segment %d to %d",
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track, track * ft_segments_per_track,
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(track + 1) * ft_segments_per_track - 1);
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/*
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* initialize the buffer switching protocol for this track
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*/
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head = ftape_get_buffer(ft_queue_head); /* tape isn't running yet */
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tail = ftape_get_buffer(ft_queue_tail); /* tape isn't running yet */
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switch_segment = 0;
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do {
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FT_SIGNAL_EXIT(_DONT_BLOCK);
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setup_format_buffer(tail, switch_segment,
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ft_segments_per_track, gap3);
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switch_segment = tail->next_segment;
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} while ((switch_segment != 0) &&
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((tail = ftape_next_buffer(ft_queue_tail)) != head));
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/* go */
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head->status = formatting;
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TRACE_CATCH(ftape_seek_head_to_track(track),);
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TRACE_CATCH(ftape_command(QIC_LOGICAL_FORWARD),);
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save_flags(flags); cli();
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TRACE_CATCH(fdc_setup_formatting(head), restore_flags(flags));
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restore_flags(flags);
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TRACE_EXIT 0;
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}
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/* return segment id of segment currently being formatted and do the
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* buffer switching stuff.
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*/
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int ftape_format_status(unsigned int *segment_id)
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{
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buffer_struct *tail = ftape_get_buffer(ft_queue_tail);
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int result;
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TRACE_FUN(ft_t_flow);
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while (switch_segment != 0 &&
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ftape_get_buffer(ft_queue_head) != tail) {
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FT_SIGNAL_EXIT(_DONT_BLOCK);
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/* need more buffers, first wait for empty buffer
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*/
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TRACE_CATCH(ftape_wait_segment(formatting),);
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/* don't worry for gap3. If we ever hit this piece of code,
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* then all buffer already have the correct gap3 set!
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*/
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setup_format_buffer(tail, switch_segment,
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ft_segments_per_track, tail->gap3);
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switch_segment = tail->next_segment;
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if (switch_segment != 0) {
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tail = ftape_next_buffer(ft_queue_tail);
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}
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}
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/* should runner stop ?
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*/
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if (ft_runner_status == aborting || ft_runner_status == do_abort) {
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buffer_struct *head = ftape_get_buffer(ft_queue_head);
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TRACE(ft_t_warn, "Error formatting segment %d",
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ftape_get_buffer(ft_queue_head)->segment_id);
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(void)ftape_abort_operation();
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TRACE_EXIT (head->status != error) ? -EAGAIN : -EIO;
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}
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/*
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* don't care if the timer expires, this is just kind of a
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* "select" operation that lets the calling process sleep
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* until something has happened
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*/
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if (fdc_interrupt_wait(5 * FT_SECOND) < 0) {
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TRACE(ft_t_noise, "End of track %d at segment %d",
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ft_location.track,
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ftape_get_buffer(ft_queue_head)->segment_id);
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result = 1; /* end of track, unlock module */
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} else {
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result = 0;
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}
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/*
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* the calling process should use the seg id to determine
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* which parts of the dma buffers can be safely overwritten
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* with new data.
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*/
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*segment_id = ftape_get_buffer(ft_queue_head)->segment_id;
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/*
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* Internally we start counting segment ids from the start of
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* each track when formatting, but externally we keep them
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* relative to the start of the tape:
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*/
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*segment_id += ft_location.track * ft_segments_per_track;
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TRACE_EXIT result;
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}
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| 200 |
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/*
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* The segment id is relative to the start of the tape
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*/
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int ftape_verify_segment(const unsigned int segment_id, SectorMap *bsm)
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{
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int result;
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int verify_done = 0;
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TRACE_FUN(ft_t_flow);
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TRACE(ft_t_noise, "Verifying segment %d", segment_id);
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| 211 |
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if (ft_driver_state != verifying) {
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TRACE(ft_t_noise, "calling ftape_abort_operation");
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if (ftape_abort_operation() < 0) {
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TRACE(ft_t_err, "ftape_abort_operation failed");
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TRACE_EXIT -EIO;
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}
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}
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*bsm = 0x00000000;
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ftape_set_state(verifying);
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for (;;) {
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buffer_struct *tail;
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/*
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* Allow escape from this loop on signal
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| 224 |
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*/
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| 225 |
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FT_SIGNAL_EXIT(_DONT_BLOCK);
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/*
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* Search all full buffers for the first matching the
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* wanted segment. Clear other buffers on the fly.
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*/
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tail = ftape_get_buffer(ft_queue_tail);
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while (!verify_done && tail->status == done) {
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/*
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| 233 |
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* Allow escape from this loop on signal !
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*/
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| 235 |
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FT_SIGNAL_EXIT(_DONT_BLOCK);
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| 236 |
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if (tail->segment_id == segment_id) {
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| 237 |
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/* If out buffer is already full,
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| 238 |
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* return its contents.
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| 239 |
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*/
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| 240 |
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TRACE(ft_t_flow, "found segment in cache: %d",
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segment_id);
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| 242 |
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if ((tail->soft_error_map |
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| 243 |
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tail->hard_error_map) != 0) {
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| 244 |
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TRACE(ft_t_info,"bsm[%d] = 0x%08lx",
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segment_id,
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| 246 |
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(unsigned long)
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| 247 |
|
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(tail->soft_error_map |
|
| 248 |
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tail->hard_error_map));
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| 249 |
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*bsm = (tail->soft_error_map |
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| 250 |
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tail->hard_error_map);
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| 251 |
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}
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| 252 |
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verify_done = 1;
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| 253 |
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} else {
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| 254 |
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TRACE(ft_t_flow,"zapping segment in cache: %d",
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| 255 |
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tail->segment_id);
|
| 256 |
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}
|
| 257 |
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tail->status = waiting;
|
| 258 |
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tail = ftape_next_buffer(ft_queue_tail);
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| 259 |
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}
|
| 260 |
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if (!verify_done && tail->status == verifying) {
|
| 261 |
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if (tail->segment_id == segment_id) {
|
| 262 |
|
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switch(ftape_wait_segment(verifying)) {
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| 263 |
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case 0:
|
| 264 |
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break;
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| 265 |
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case -EINTR:
|
| 266 |
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TRACE_ABORT(-EINTR, ft_t_warn,
|
| 267 |
|
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"interrupted by "
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| 268 |
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"non-blockable signal");
|
| 269 |
|
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break;
|
| 270 |
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default:
|
| 271 |
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ftape_abort_operation();
|
| 272 |
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ftape_set_state(verifying);
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| 273 |
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/* be picky */
|
| 274 |
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TRACE_ABORT(-EIO, ft_t_warn,
|
| 275 |
|
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"wait_segment failed");
|
| 276 |
|
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}
|
| 277 |
|
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} else {
|
| 278 |
|
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/* We're reading the wrong segment,
|
| 279 |
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* stop runner.
|
| 280 |
|
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*/
|
| 281 |
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TRACE(ft_t_noise, "verifying wrong segment");
|
| 282 |
|
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ftape_abort_operation();
|
| 283 |
|
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ftape_set_state(verifying);
|
| 284 |
|
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}
|
| 285 |
|
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}
|
| 286 |
|
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/* should runner stop ?
|
| 287 |
|
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*/
|
| 288 |
|
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if (ft_runner_status == aborting) {
|
| 289 |
|
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buffer_struct *head = ftape_get_buffer(ft_queue_head);
|
| 290 |
|
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if (head->status == error ||
|
| 291 |
|
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head->status == verifying) {
|
| 292 |
|
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/* no data or overrun error */
|
| 293 |
|
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head->status = waiting;
|
| 294 |
|
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}
|
| 295 |
|
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TRACE_CATCH(ftape_dumb_stop(),);
|
| 296 |
|
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} else {
|
| 297 |
|
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/* If just passed last segment on tape: wait
|
| 298 |
|
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* for BOT or EOT mark. Sets ft_runner_status to
|
| 299 |
|
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* idle if at lEOT and successful
|
| 300 |
|
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*/
|
| 301 |
|
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TRACE_CATCH(ftape_handle_logical_eot(),);
|
| 302 |
|
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}
|
| 303 |
|
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if (verify_done) {
|
| 304 |
|
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TRACE_EXIT 0;
|
| 305 |
|
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}
|
| 306 |
|
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/* Now at least one buffer is idle!
|
| 307 |
|
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* Restart runner & tape if needed.
|
| 308 |
|
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*/
|
| 309 |
|
|
/* We could optimize the following a little bit. We know that
|
| 310 |
|
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* the bad sector map is empty.
|
| 311 |
|
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*/
|
| 312 |
|
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tail = ftape_get_buffer(ft_queue_tail);
|
| 313 |
|
|
if (tail->status == waiting) {
|
| 314 |
|
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buffer_struct *head = ftape_get_buffer(ft_queue_head);
|
| 315 |
|
|
|
| 316 |
|
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ftape_setup_new_segment(head, segment_id, -1);
|
| 317 |
|
|
ftape_calc_next_cluster(head);
|
| 318 |
|
|
if (ft_runner_status == idle) {
|
| 319 |
|
|
result = ftape_start_tape(segment_id,
|
| 320 |
|
|
head->sector_offset);
|
| 321 |
|
|
switch(result) {
|
| 322 |
|
|
case 0:
|
| 323 |
|
|
break;
|
| 324 |
|
|
case -ETIME:
|
| 325 |
|
|
case -EINTR:
|
| 326 |
|
|
TRACE_ABORT(result, ft_t_err, "Error: "
|
| 327 |
|
|
"segment %d unreachable",
|
| 328 |
|
|
segment_id);
|
| 329 |
|
|
break;
|
| 330 |
|
|
default:
|
| 331 |
|
|
*bsm = EMPTY_SEGMENT;
|
| 332 |
|
|
TRACE_EXIT 0;
|
| 333 |
|
|
break;
|
| 334 |
|
|
}
|
| 335 |
|
|
}
|
| 336 |
|
|
head->status = verifying;
|
| 337 |
|
|
fdc_setup_read_write(head, FDC_VERIFY);
|
| 338 |
|
|
}
|
| 339 |
|
|
}
|
| 340 |
|
|
/* not reached */
|
| 341 |
|
|
TRACE_EXIT -EIO;
|
| 342 |
|
|
}
|
