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switch IDE to taskfile IO
Resynced with 2.5.69-bk10 and updated slightly.
Please try it if you were experiencing problems
with IDE PIO / IDE multisector PIO
As usual with IDE stuff, special care is needed.
I want to send it to Linus before 2.6.
--
Bartlomiej
# Switch IDE to taskfile IO and remove non-taskfile code.
# New IDE PIO handlers for taskfile IO (they use bio walking).
#
# Bartlomiej Zolnierkiewicz <bzolnier@elka.pw.edu.pl>
drivers/ide/ide-disk.c | 426 -----------------------------------
drivers/ide/ide-taskfile.c | 545 ++++++++++++++++++---------------------------
include/linux/blkdev.h | 1
include/linux/ide.h | 20 +
4 files changed, 244 insertions(+), 748 deletions(-)
diff -puN drivers/ide/ide-disk.c~ide_tf_pio_handlers drivers/ide/ide-disk.c
--- linux-2.5.69-bk10/drivers/ide/ide-disk.c~ide_tf_pio_handlers Fri May 16 00:24:41 2003
+++ linux-2.5.69-bk10-root/drivers/ide/ide-disk.c Fri May 16 00:31:25 2003
@@ -136,427 +136,6 @@ static int idedisk_start_tag(ide_drive_t
return ret;
}
-#ifndef CONFIG_IDE_TASKFILE_IO
-
-static int driver_blocked;
-
-/*
- * read_intr() is the handler for disk read/multread interrupts
- */
-static ide_startstop_t read_intr (ide_drive_t *drive)
-{
- ide_hwif_t *hwif = HWIF(drive);
- u32 i = 0, nsect = 0, msect = drive->mult_count;
- struct request *rq;
- unsigned long flags;
- u8 stat;
- char *to;
-
- /* new way for dealing with premature shared PCI interrupts */
- if (!OK_STAT(stat=hwif->INB(IDE_STATUS_REG),DATA_READY,BAD_R_STAT)) {
- if (stat & (ERR_STAT|DRQ_STAT)) {
- return DRIVER(drive)->error(drive, "read_intr", stat);
- }
- /* no data yet, so wait for another interrupt */
- ide_set_handler(drive, &read_intr, WAIT_CMD, NULL);
- return ide_started;
- }
-
-read_next:
- rq = HWGROUP(drive)->rq;
- if (msect) {
- if ((nsect = rq->current_nr_sectors) > msect)
- nsect = msect;
- msect -= nsect;
- } else
- nsect = 1;
- to = ide_map_buffer(rq, &flags);
- taskfile_input_data(drive, to, nsect * SECTOR_WORDS);
-#ifdef DEBUG
- printk("%s: read: sectors(%ld-%ld), buffer=0x%08lx, remaining=%ld\n",
- drive->name, rq->sector, rq->sector+nsect-1,
- (unsigned long) rq->buffer+(nsect<<9), rq->nr_sectors-nsect);
-#endif
- ide_unmap_buffer(rq, to, &flags);
- rq->sector += nsect;
- rq->errors = 0;
- i = (rq->nr_sectors -= nsect);
- if (((long)(rq->current_nr_sectors -= nsect)) <= 0)
- ide_end_request(drive, 1, rq->hard_cur_sectors);
- /*
- * Another BH Page walker and DATA INTEGRITY Questioned on ERROR.
- * If passed back up on multimode read, BAD DATA could be ACKED
- * to FILE SYSTEMS above ...
- */
- if (i > 0) {
- if (msect)
- goto read_next;
- ide_set_handler(drive, &read_intr, WAIT_CMD, NULL);
- return ide_started;
- }
- return ide_stopped;
-}
-
-/*
- * write_intr() is the handler for disk write interrupts
- */
-static ide_startstop_t write_intr (ide_drive_t *drive)
-{
- ide_hwgroup_t *hwgroup = HWGROUP(drive);
- ide_hwif_t *hwif = HWIF(drive);
- struct request *rq = hwgroup->rq;
- u32 i = 0;
- u8 stat;
-
- if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),
- DRIVE_READY, drive->bad_wstat)) {
- printk("%s: write_intr error1: nr_sectors=%ld, stat=0x%02x\n",
- drive->name, rq->nr_sectors, stat);
- } else {
-#ifdef DEBUG
- printk("%s: write: sector %ld, buffer=0x%08lx, remaining=%ld\n",
- drive->name, rq->sector, (unsigned long) rq->buffer,
- rq->nr_sectors-1);
-#endif
- if ((rq->nr_sectors == 1) ^ ((stat & DRQ_STAT) != 0)) {
- rq->sector++;
- rq->errors = 0;
- i = --rq->nr_sectors;
- --rq->current_nr_sectors;
- if (((long)rq->current_nr_sectors) <= 0)
- ide_end_request(drive, 1, rq->hard_cur_sectors);
- if (i > 0) {
- unsigned long flags;
- char *to = ide_map_buffer(rq, &flags);
- taskfile_output_data(drive, to, SECTOR_WORDS);
- ide_unmap_buffer(rq, to, &flags);
- ide_set_handler(drive, &write_intr, WAIT_CMD, NULL);
- return ide_started;
- }
- return ide_stopped;
- }
- /* the original code did this here (?) */
- return ide_stopped;
- }
- return DRIVER(drive)->error(drive, "write_intr", stat);
-}
-
-/*
- * ide_multwrite() transfers a block of up to mcount sectors of data
- * to a drive as part of a disk multiple-sector write operation.
- *
- * Returns 0 on success.
- *
- * Note that we may be called from two contexts - the do_rw_disk context
- * and IRQ context. The IRQ can happen any time after we've output the
- * full "mcount" number of sectors, so we must make sure we update the
- * state _before_ we output the final part of the data!
- *
- * The update and return to BH is a BLOCK Layer Fakey to get more data
- * to satisfy the hardware atomic segment. If the hardware atomic segment
- * is shorter or smaller than the BH segment then we should be OKAY.
- * This is only valid if we can rewind the rq->current_nr_sectors counter.
- */
-int ide_multwrite (ide_drive_t *drive, unsigned int mcount)
-{
- ide_hwgroup_t *hwgroup = HWGROUP(drive);
- struct request *rq = &hwgroup->wrq;
-
- do {
- char *buffer;
- int nsect = rq->current_nr_sectors;
- unsigned long flags;
-
- if (nsect > mcount)
- nsect = mcount;
- mcount -= nsect;
- buffer = ide_map_buffer(rq, &flags);
-
- rq->sector += nsect;
- rq->nr_sectors -= nsect;
- rq->current_nr_sectors -= nsect;
-
- /* Do we move to the next bh after this? */
- if (!rq->current_nr_sectors) {
- struct bio *bio = rq->bio;
-
- /*
- * only move to next bio, when we have processed
- * all bvecs in this one.
- */
- if (++bio->bi_idx >= bio->bi_vcnt) {
- bio->bi_idx = 0;
- bio = bio->bi_next;
- }
-
- /* end early early we ran out of requests */
- if (!bio) {
- mcount = 0;
- } else {
- rq->bio = bio;
- rq->current_nr_sectors = bio_iovec(bio)->bv_len >> 9;
- rq->hard_cur_sectors = rq->current_nr_sectors;
- }
- }
-
- /*
- * Ok, we're all setup for the interrupt
- * re-entering us on the last transfer.
- */
- taskfile_output_data(drive, buffer, nsect<<7);
- ide_unmap_buffer(rq, buffer, &flags);
- } while (mcount);
-
- return 0;
-}
-
-/*
- * multwrite_intr() is the handler for disk multwrite interrupts
- */
-static ide_startstop_t multwrite_intr (ide_drive_t *drive)
-{
- ide_hwgroup_t *hwgroup = HWGROUP(drive);
- ide_hwif_t *hwif = HWIF(drive);
- struct request *rq = &hwgroup->wrq;
- u8 stat;
-
- stat = hwif->INB(IDE_STATUS_REG);
- if (OK_STAT(stat, DRIVE_READY, drive->bad_wstat)) {
- if (stat & DRQ_STAT) {
- /*
- * The drive wants data. Remember rq is the copy
- * of the request
- */
- if (rq->nr_sectors) {
- if (ide_multwrite(drive, drive->mult_count))
- return ide_stopped;
- ide_set_handler(drive, &multwrite_intr, WAIT_CMD, NULL);
- return ide_started;
- }
- } else {
- /*
- * If the copy has all the blocks completed then
- * we can end the original request.
- */
- if (!rq->nr_sectors) { /* all done? */
- rq = hwgroup->rq;
- ide_end_request(drive, 1, rq->nr_sectors);
- return ide_stopped;
- }
- }
- /* the original code did this here (?) */
- return ide_stopped;
- }
- return DRIVER(drive)->error(drive, "multwrite_intr", stat);
-}
-
-/*
- * do_rw_disk() issues READ and WRITE commands to a disk,
- * using LBA if supported, or CHS otherwise, to address sectors.
- * It also takes care of issuing special DRIVE_CMDs.
- */
-static ide_startstop_t do_rw_disk (ide_drive_t *drive, struct request *rq, sector_t block)
-{
- ide_hwif_t *hwif = HWIF(drive);
- u8 lba48 = (drive->addressing == 1) ? 1 : 0;
- task_ioreg_t command = WIN_NOP;
- ata_nsector_t nsectors;
-
- nsectors.all = (u16) rq->nr_sectors;
-
- if (driver_blocked)
- panic("Request while ide driver is blocked?");
-
-#if defined(CONFIG_BLK_DEV_PDC4030) || defined(CONFIG_BLK_DEV_PDC4030_MODULE)
- if (IS_PDC4030_DRIVE)
- return promise_rw_disk(drive, rq, block);
-#endif /* CONFIG_BLK_DEV_PDC4030 */
-
- if (drive->using_tcq && idedisk_start_tag(drive, rq)) {
- if (!ata_pending_commands(drive))
- BUG();
-
- return ide_started;
- }
-
- if (IDE_CONTROL_REG)
- hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
-
- if (drive->select.b.lba) {
- if (drive->addressing == 1) {
- task_ioreg_t tasklets[10];
-
- if (blk_rq_tagged(rq)) {
- tasklets[0] = nsectors.b.low;
- tasklets[1] = nsectors.b.high;
- tasklets[2] = rq->tag << 3;
- tasklets[3] = 0;
- } else {
- tasklets[0] = 0;
- tasklets[1] = 0;
- tasklets[2] = nsectors.b.low;
- tasklets[3] = nsectors.b.high;
- }
-
- tasklets[4] = (task_ioreg_t) block;
- tasklets[5] = (task_ioreg_t) (block>>8);
- tasklets[6] = (task_ioreg_t) (block>>16);
- tasklets[7] = (task_ioreg_t) (block>>24);
- if (sizeof(block) == 4) {
- tasklets[8] = (task_ioreg_t) 0;
- tasklets[9] = (task_ioreg_t) 0;
- } else {
- tasklets[8] = (task_ioreg_t)((u64)block >> 32);
- tasklets[9] = (task_ioreg_t)((u64)block >> 40);
- }
-#ifdef DEBUG
- printk("%s: %sing: LBAsect=%lu, sectors=%ld, "
- "buffer=0x%08lx, LBAsect=0x%012lx\n",
- drive->name,
- rq_data_dir(rq)==READ?"read":"writ",
- block,
- rq->nr_sectors,
- (unsigned long) rq->buffer,
- block);
- printk("%s: 0x%02x%02x 0x%02x%02x%02x%02x%02x%02x\n",
- drive->name, tasklets[3], tasklets[2],
- tasklets[9], tasklets[8], tasklets[7],
- tasklets[6], tasklets[5], tasklets[4]);
-#endif
- hwif->OUTB(tasklets[1], IDE_FEATURE_REG);
- hwif->OUTB(tasklets[3], IDE_NSECTOR_REG);
- hwif->OUTB(tasklets[7], IDE_SECTOR_REG);
- hwif->OUTB(tasklets[8], IDE_LCYL_REG);
- hwif->OUTB(tasklets[9], IDE_HCYL_REG);
-
- hwif->OUTB(tasklets[0], IDE_FEATURE_REG);
- hwif->OUTB(tasklets[2], IDE_NSECTOR_REG);
- hwif->OUTB(tasklets[4], IDE_SECTOR_REG);
- hwif->OUTB(tasklets[5], IDE_LCYL_REG);
- hwif->OUTB(tasklets[6], IDE_HCYL_REG);
- hwif->OUTB(0x00|drive->select.all,IDE_SELECT_REG);
- } else {
-#ifdef DEBUG
- printk("%s: %sing: LBAsect=%llu, sectors=%ld, "
- "buffer=0x%08lx\n",
- drive->name,
- rq_data_dir(rq)==READ?"read":"writ",
- (unsigned long long)block, rq->nr_sectors,
- (unsigned long) rq->buffer);
-#endif
- if (blk_rq_tagged(rq)) {
- hwif->OUTB(nsectors.b.low, IDE_FEATURE_REG);
- hwif->OUTB(rq->tag << 3, IDE_NSECTOR_REG);
- } else {
- hwif->OUTB(0x00, IDE_FEATURE_REG);
- hwif->OUTB(nsectors.b.low, IDE_NSECTOR_REG);
- }
-
- hwif->OUTB(block, IDE_SECTOR_REG);
- hwif->OUTB(block>>=8, IDE_LCYL_REG);
- hwif->OUTB(block>>=8, IDE_HCYL_REG);
- hwif->OUTB(((block>>8)&0x0f)|drive->select.all,IDE_SELECT_REG);
- }
- } else {
- unsigned int sect,head,cyl,track;
- track = (int)block / drive->sect;
- sect = (int)block % drive->sect + 1;
- hwif->OUTB(sect, IDE_SECTOR_REG);
- head = track % drive->head;
- cyl = track / drive->head;
-
- if (blk_rq_tagged(rq)) {
- hwif->OUTB(nsectors.b.low, IDE_FEATURE_REG);
- hwif->OUTB(rq->tag << 3, IDE_NSECTOR_REG);
- } else {
- hwif->OUTB(0x00, IDE_FEATURE_REG);
- hwif->OUTB(nsectors.b.low, IDE_NSECTOR_REG);
- }
-
- hwif->OUTB(cyl, IDE_LCYL_REG);
- hwif->OUTB(cyl>>8, IDE_HCYL_REG);
- hwif->OUTB(head|drive->select.all,IDE_SELECT_REG);
-#ifdef DEBUG
- printk("%s: %sing: CHS=%d/%d/%d, sectors=%ld, buffer=0x%08lx\n",
- drive->name, rq_data_dir(rq)==READ?"read":"writ", cyl,
- head, sect, rq->nr_sectors, (unsigned long) rq->buffer);
-#endif
- }
-
- if (rq_data_dir(rq) == READ) {
- if (blk_rq_tagged(rq))
- return hwif->ide_dma_queued_read(drive);
-
- if (drive->using_dma && !hwif->ide_dma_read(drive))
- return ide_started;
-
- command = ((drive->mult_count) ?
- ((lba48) ? WIN_MULTREAD_EXT : WIN_MULTREAD) :
- ((lba48) ? WIN_READ_EXT : WIN_READ));
- ide_execute_command(drive, command, &read_intr, WAIT_CMD, NULL);
- return ide_started;
- } else if (rq_data_dir(rq) == WRITE) {
- ide_startstop_t startstop;
-
- if (blk_rq_tagged(rq))
- return hwif->ide_dma_queued_write(drive);
-
- if (drive->using_dma && !(HWIF(drive)->ide_dma_write(drive)))
- return ide_started;
-
- command = ((drive->mult_count) ?
- ((lba48) ? WIN_MULTWRITE_EXT : WIN_MULTWRITE) :
- ((lba48) ? WIN_WRITE_EXT : WIN_WRITE));
- hwif->OUTB(command, IDE_COMMAND_REG);
-
- if (ide_wait_stat(&startstop, drive, DATA_READY,
- drive->bad_wstat, WAIT_DRQ)) {
- printk(KERN_ERR "%s: no DRQ after issuing %s\n",
- drive->name,
- drive->mult_count ? "MULTWRITE" : "WRITE");
- return startstop;
- }
- if (!drive->unmask)
- local_irq_disable();
- if (drive->mult_count) {
- ide_hwgroup_t *hwgroup = HWGROUP(drive);
- /*
- * Ugh.. this part looks ugly because we MUST set up
- * the interrupt handler before outputting the first block
- * of data to be written. If we hit an error (corrupted buffer list)
- * in ide_multwrite(), then we need to remove the handler/timer
- * before returning. Fortunately, this NEVER happens (right?).
- *
- * Except when you get an error it seems...
- *
- * MAJOR DATA INTEGRITY BUG !!! only if we error
- */
- hwgroup->wrq = *rq; /* scratchpad */
- ide_set_handler(drive, &multwrite_intr, WAIT_CMD, NULL);
- if (ide_multwrite(drive, drive->mult_count)) {
- unsigned long flags;
- spin_lock_irqsave(&ide_lock, flags);
- hwgroup->handler = NULL;
- del_timer(&hwgroup->timer);
- spin_unlock_irqrestore(&ide_lock, flags);
- return ide_stopped;
- }
- } else {
- unsigned long flags;
- char *to = ide_map_buffer(rq, &flags);
- ide_set_handler(drive, &write_intr, WAIT_CMD, NULL);
- taskfile_output_data(drive, to, SECTOR_WORDS);
- ide_unmap_buffer(rq, to, &flags);
- }
- return ide_started;
- }
- blk_dump_rq_flags(rq, "do_rw_disk - bad command");
- ide_end_request(drive, 0, 0);
- return ide_stopped;
-}
-
-#else /* CONFIG_IDE_TASKFILE_IO */
-
static ide_startstop_t chs_rw_disk(ide_drive_t *, struct request *, unsigned long);
static ide_startstop_t lba_28_rw_disk(ide_drive_t *, struct request *, unsigned long);
static ide_startstop_t lba_48_rw_disk(ide_drive_t *, struct request *, unsigned long long);
@@ -758,8 +337,6 @@ static ide_startstop_t lba_48_rw_disk (i
return do_rw_taskfile(drive, &args);
}
-#endif /* CONFIG_IDE_TASKFILE_IO */
-
static int do_idedisk_flushcache(ide_drive_t *drive);
static u8 idedisk_dump_status (ide_drive_t *drive, const char *msg, u8 stat)
@@ -864,6 +441,9 @@ ide_startstop_t idedisk_error (ide_drive
return ide_stopped;
}
#endif
+ /* make rq completion pointers new submission pointers */
+ blk_rq_prep_restart(rq);
+
if (stat & BUSY_STAT || ((stat & WRERR_STAT) && !drive->nowerr)) {
/* other bits are useless when BUSY */
rq->errors |= ERROR_RESET;
diff -puN drivers/ide/ide-taskfile.c~ide_tf_pio_handlers drivers/ide/ide-taskfile.c
--- linux-2.5.69-bk10/drivers/ide/ide-taskfile.c~ide_tf_pio_handlers Fri May 16 00:24:01 2003
+++ linux-2.5.69-bk10-root/drivers/ide/ide-taskfile.c Fri May 16 00:34:20 2003
@@ -5,6 +5,7 @@
* Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org>
* Copyright (C) 2001-2002 Klaus Smolin
* IBM Storage Technology Division
+ * Copyright (C) 2003 Bartlomiej Zolnierkiewicz
*
* The big the bad and the ugly.
*
@@ -58,9 +59,6 @@
#define DTF(x...)
#endif
-#define task_map_rq(rq, flags) ide_map_buffer((rq), (flags))
-#define task_unmap_rq(rq, buf, flags) ide_unmap_buffer((rq), (buf), (flags))
-
static void ata_bswap_data (void *buffer, int wcount)
{
u16 *p = buffer;
@@ -167,9 +165,12 @@ ide_startstop_t do_rw_taskfile (ide_driv
hwif->OUTB((taskfile->device_head & HIHI) | drive->select.all, IDE_SELECT_REG);
if (task->handler != NULL) {
- ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
- if (task->prehandler != NULL)
+ if (task->prehandler != NULL) {
+ hwif->OUTBSYNC(drive, taskfile->command, IDE_COMMAND_REG);
+ ndelay(400); /* FIXME */
return task->prehandler(drive, task->rq);
+ }
+ ide_execute_command(drive, taskfile->command, task->handler, WAIT_WORSTCASE, NULL);
return ide_started;
}
@@ -351,404 +352,297 @@ ide_startstop_t task_no_data_intr (ide_d
EXPORT_SYMBOL(task_no_data_intr);
-/*
- * Handler for command with PIO data-in phase, READ
- */
-/*
- * FIXME before 2.4 enable ...
- * DATA integrity issue upon error. <andre@linux-ide.org>
- */
-ide_startstop_t task_in_intr (ide_drive_t *drive)
+static u8 wait_drive_not_busy(ide_drive_t *drive)
{
- struct request *rq = HWGROUP(drive)->rq;
- ide_hwif_t *hwif = HWIF(drive);
- char *pBuf = NULL;
+ ide_hwif_t *hwif = HWIF(drive);
+ int retries = 5;
u8 stat;
+ /*
+ * (ks) Last sector was transfered, wait until drive is ready.
+ * This can take up to 10 usec. We willl wait max 50 us.
+ */
+ while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) && retries--)
+ udelay(10);
+ return stat;
+}
+
+#define PIO_IN 0
+#define PIO_OUT 1
+
+static inline void task_sectors(ide_drive_t *drive, struct request *rq,
+ unsigned nsect, int rw)
+{
unsigned long flags;
+ char *buf;
- if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),DATA_READY,BAD_R_STAT)) {
- if (stat & (ERR_STAT|DRQ_STAT)) {
-#if 0
- DTF("%s: attempting to recover last " \
- "sector counter status=0x%02x\n",
- drive->name, stat);
- /*
- * Expect a BUG BOMB if we attempt to rewind the
- * offset in the BH aka PAGE in the current BLOCK
- * segment. This is different than the HOST segment.
- */
-#endif
- if (!rq->bio)
- rq->current_nr_sectors++;
- return DRIVER(drive)->error(drive, "task_in_intr", stat);
- }
- if (!(stat & BUSY_STAT)) {
- DTF("task_in_intr to Soon wait for next interrupt\n");
- if (HWGROUP(drive)->handler == NULL)
- ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
- return ide_started;
- }
- }
-#if 0
+ buf = task_map_rq(rq, &flags);
/*
- * Holding point for a brain dump of a thought :-/
+ * IRQ can happen instantly after reading/writing
+ * last sector of the datablock.
*/
+ process_that_request_first(rq, nsect);
- if (!OK_STAT(stat,DRIVE_READY,drive->bad_wstat)) {
- DTF("%s: READ attempting to recover last " \
- "sector counter status=0x%02x\n",
- drive->name, stat);
- rq->current_nr_sectors++;
- return DRIVER(drive)->error(drive, "task_in_intr", stat);
- }
- if (!rq->current_nr_sectors)
- if (!DRIVER(drive)->end_request(drive, 1, 0))
- return ide_stopped;
+ if (rw == PIO_OUT)
+ taskfile_output_data(drive, buf, nsect * SECTOR_WORDS);
+ else
+ taskfile_input_data(drive, buf, nsect * SECTOR_WORDS);
- if (--rq->current_nr_sectors <= 0)
- if (!DRIVER(drive)->end_request(drive, 1, 0))
- return ide_stopped;
-#endif
+ task_unmap_rq(rq, buf, &flags);
+}
+
+/*
+ * Handler for command with PIO data-in phase (Read).
+ */
+ide_startstop_t task_in_intr (ide_drive_t *drive)
+{
+ struct request *rq = HWGROUP(drive)->rq;
+ u8 stat, good_stat;
+
+ good_stat = DATA_READY;
+ stat = HWIF(drive)->INB(IDE_STATUS_REG);
+check_status:
+ if (!OK_STAT(stat, good_stat, BAD_R_STAT)) {
+ if (stat & (ERR_STAT | DRQ_STAT))
+ return DRIVER(drive)->error(drive, __FUNCTION__, stat);
+ /* BUSY_STAT: No data yet, so wait for another IRQ. */
+ ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
+ return ide_started;
+ }
- pBuf = task_map_rq(rq, &flags);
- DTF("Read: %p, rq->current_nr_sectors: %d, stat: %02x\n",
- pBuf, (int) rq->current_nr_sectors, stat);
- taskfile_input_data(drive, pBuf, SECTOR_WORDS);
- task_unmap_rq(rq, pBuf, &flags);
/*
- * FIXME :: We really can not legally get a new page/bh
- * regardless, if this is the end of our segment.
- * BH walking or segment can only be updated after we have a good
- * hwif->INB(IDE_STATUS_REG); return.
+ * Complete previously submitted bios (if any).
+ * Status was already verifyied.
*/
- if (--rq->current_nr_sectors <= 0)
- if (!DRIVER(drive)->end_request(drive, 1, 0))
+ while (rq->bio != rq->cbio)
+ if (!DRIVER(drive)->end_request(drive, 1, bio_sectors(rq->bio)))
return ide_stopped;
- /*
- * ERM, it is techincally legal to leave/exit here but it makes
- * a mess of the code ...
- */
- if (HWGROUP(drive)->handler == NULL)
- ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
+ /* Complete rq->buffer based request (ioctls). */
+ if (!rq->bio && !rq->nr_sectors) {
+ ide_end_drive_cmd(drive, stat, HWIF(drive)->INB(IDE_ERROR_REG));
+ return ide_stopped;
+ }
+
+ rq->errors = 0;
+ task_sectors(drive, rq, 1, PIO_IN);
+
+ /* If it was the last datablock check status and finish transfer. */
+ if (!rq->nr_sectors) {
+ good_stat = 0;
+ stat = wait_drive_not_busy(drive);
+ goto check_status;
+ }
+
+ /* Still data left to transfer. */
+ ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL);
+
return ide_started;
}
-
EXPORT_SYMBOL(task_in_intr);
/*
- * Handler for command with Read Multiple
+ * Handler for command with PIO data-in phase (Read Multiple).
*/
ide_startstop_t task_mulin_intr (ide_drive_t *drive)
{
- ide_hwif_t *hwif = HWIF(drive);
- struct request *rq = HWGROUP(drive)->rq;
- char *pBuf = NULL;
- unsigned int msect = drive->mult_count;
+ struct request *rq = HWGROUP(drive)->rq;
+ unsigned int msect = drive->mult_count;
unsigned int nsect;
- unsigned long flags;
- u8 stat;
+ u8 stat, good_stat;
- if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),DATA_READY,BAD_R_STAT)) {
- if (stat & (ERR_STAT|DRQ_STAT)) {
- if (!rq->bio) {
- rq->current_nr_sectors += drive->mult_count;
- /*
- * NOTE: could rewind beyond beginning :-/
- */
- } else {
- printk(KERN_ERR "%s: MULTI-READ assume all data " \
- "transfered is bad status=0x%02x\n",
- drive->name, stat);
- }
- return DRIVER(drive)->error(drive, "task_mulin_intr", stat);
- }
- /* no data yet, so wait for another interrupt */
- if (HWGROUP(drive)->handler == NULL)
- ide_set_handler(drive, &task_mulin_intr, WAIT_WORSTCASE, NULL);
+ good_stat = DATA_READY;
+ stat = HWIF(drive)->INB(IDE_STATUS_REG);
+check_status:
+ if (!OK_STAT(stat, good_stat, BAD_R_STAT)) {
+ if (stat & (ERR_STAT | DRQ_STAT))
+ return DRIVER(drive)->error(drive, __FUNCTION__, stat);
+ /* BUSY_STAT: No data yet, so wait for another IRQ. */
+ ide_set_handler(drive, &task_mulin_intr, WAIT_WORSTCASE, NULL);
return ide_started;
}
+ /*
+ * Complete previously submitted bios (if any).
+ * Status was already verifyied.
+ */
+ while (rq->bio != rq->cbio)
+ if (!DRIVER(drive)->end_request(drive, 1, bio_sectors(rq->bio)))
+ return ide_stopped;
+ /* Complete rq->buffer based request (ioctls). */
+ if (!rq->bio && !rq->nr_sectors) {
+ ide_end_drive_cmd(drive, stat, HWIF(drive)->INB(IDE_ERROR_REG));
+ return ide_stopped;
+ }
+
+ rq->errors = 0;
do {
nsect = rq->current_nr_sectors;
if (nsect > msect)
nsect = msect;
- pBuf = task_map_rq(rq, &flags);
- DTF("Multiread: %p, nsect: %d, msect: %d, " \
- " rq->current_nr_sectors: %d\n",
- pBuf, nsect, msect, rq->current_nr_sectors);
- taskfile_input_data(drive, pBuf, nsect * SECTOR_WORDS);
- task_unmap_rq(rq, pBuf, &flags);
- rq->errors = 0;
- rq->current_nr_sectors -= nsect;
- msect -= nsect;
- /*
- * FIXME :: We really can not legally get a new page/bh
- * regardless, if this is the end of our segment.
- * BH walking or segment can only be updated after we have a
- * good hwif->INB(IDE_STATUS_REG); return.
- */
- if (!rq->current_nr_sectors) {
- if (!DRIVER(drive)->end_request(drive, 1, 0))
- return ide_stopped;
- }
- } while (msect);
- if (HWGROUP(drive)->handler == NULL)
- ide_set_handler(drive, &task_mulin_intr, WAIT_WORSTCASE, NULL);
- return ide_started;
-}
-EXPORT_SYMBOL(task_mulin_intr);
+ task_sectors(drive, rq, nsect, PIO_IN);
-/*
- * VERIFY ME before 2.4 ... unexpected race is possible based on details
- * RMK with 74LS245/373/374 TTL buffer logic because of passthrough.
- */
-ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
-{
- char *pBuf = NULL;
- unsigned long flags;
- ide_startstop_t startstop;
+ if (!rq->nr_sectors)
+ msect = 0;
+ else
+ msect -= nsect;
+ } while (msect);
- if (ide_wait_stat(&startstop, drive, DATA_READY,
- drive->bad_wstat, WAIT_DRQ)) {
- printk(KERN_ERR "%s: no DRQ after issuing WRITE%s\n",
- drive->name,
- drive->addressing ? "_EXT" : "");
- return startstop;
+ /* If it was the last datablock check status and finish transfer. */
+ if (!rq->nr_sectors) {
+ good_stat = 0;
+ stat = wait_drive_not_busy(drive);
+ goto check_status;
}
- /* For Write_sectors we need to stuff the first sector */
- pBuf = task_map_rq(rq, &flags);
- taskfile_output_data(drive, pBuf, SECTOR_WORDS);
- rq->current_nr_sectors--;
- task_unmap_rq(rq, pBuf, &flags);
+
+ /* Still data left to transfer. */
+ ide_set_handler(drive, &task_mulin_intr, WAIT_WORSTCASE, NULL);
+
return ide_started;
}
-
-EXPORT_SYMBOL(pre_task_out_intr);
+EXPORT_SYMBOL(task_mulin_intr);
/*
- * Handler for command with PIO data-out phase WRITE
- *
- * WOOHOO this is a CORRECT STATE DIAGRAM NOW, <andre@linux-ide.org>
+ * Handler for command with PIO data-out phase (Write).
*/
ide_startstop_t task_out_intr (ide_drive_t *drive)
{
- ide_hwif_t *hwif = HWIF(drive);
- struct request *rq = HWGROUP(drive)->rq;
- char *pBuf = NULL;
- unsigned long flags;
+ struct request *rq = HWGROUP(drive)->rq;
u8 stat;
- if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG), DRIVE_READY, drive->bad_wstat)) {
- DTF("%s: WRITE attempting to recover last " \
- "sector counter status=0x%02x\n",
- drive->name, stat);
- rq->current_nr_sectors++;
- return DRIVER(drive)->error(drive, "task_out_intr", stat);
+ stat = HWIF(drive)->INB(IDE_STATUS_REG);
+ if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat)) {
+ if ((stat & (ERR_STAT | DRQ_STAT)) ||
+ ((stat & WRERR_STAT) && !drive->nowerr))
+ return DRIVER(drive)->error(drive, __FUNCTION__, stat);
+ if (stat & BUSY_STAT) {
+ /* Not ready yet, so wait for another IRQ. */
+ ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
+ return ide_started;
+ }
}
- /*
- * Safe to update request for partial completions.
- * We have a good STATUS CHECK!!!
+
+ /* Deal with unexpected ATA data phase. */
+ if ((!(stat & DATA_READY) && rq->nr_sectors) ||
+ ((stat & DATA_READY) && !rq->nr_sectors))
+ return DRIVER(drive)->error(drive, __FUNCTION__, stat);
+
+ /*
+ * Complete previously submitted bios (if any).
+ * Status was already verifyied.
*/
- if (!rq->current_nr_sectors)
- if (!DRIVER(drive)->end_request(drive, 1, 0))
+ while (rq->bio != rq->cbio)
+ if (!DRIVER(drive)->end_request(drive, 1, bio_sectors(rq->bio)))
return ide_stopped;
- if ((rq->current_nr_sectors==1) ^ (stat & DRQ_STAT)) {
- rq = HWGROUP(drive)->rq;
- pBuf = task_map_rq(rq, &flags);
- DTF("write: %p, rq->current_nr_sectors: %d\n",
- pBuf, (int) rq->current_nr_sectors);
- taskfile_output_data(drive, pBuf, SECTOR_WORDS);
- task_unmap_rq(rq, pBuf, &flags);
- rq->errors = 0;
- rq->current_nr_sectors--;
+ /* Complete rq->buffer based request (ioctls). */
+ if (!rq->bio && !rq->nr_sectors) {
+ ide_end_drive_cmd(drive, stat, HWIF(drive)->INB(IDE_ERROR_REG));
+ return ide_stopped;
}
- if (HWGROUP(drive)->handler == NULL)
- ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
+
+ /* Still data left to transfer. */
+ ide_set_handler(drive, &task_out_intr, WAIT_WORSTCASE, NULL);
+
+ rq->errors = 0;
+ task_sectors(drive, rq, 1, PIO_OUT);
+
return ide_started;
}
EXPORT_SYMBOL(task_out_intr);
-#undef ALTERNATE_STATE_DIAGRAM_MULTI_OUT
-
-ide_startstop_t pre_task_mulout_intr (ide_drive_t *drive, struct request *rq)
+ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq)
{
-#ifdef ALTERNATE_STATE_DIAGRAM_MULTI_OUT
- ide_hwif_t *hwif = HWIF(drive);
- char *pBuf = NULL;
- unsigned int nsect = 0, msect = drive->mult_count;
- u8 stat;
- unsigned long flags;
-#endif /* ALTERNATE_STATE_DIAGRAM_MULTI_OUT */
-
- ide_task_t *args = rq->special;
ide_startstop_t startstop;
-#if 0
- /*
- * assign private copy for multi-write
- */
- memcpy(&HWGROUP(drive)->wrq, rq, sizeof(struct request));
-#endif
-
if (ide_wait_stat(&startstop, drive, DATA_READY,
- drive->bad_wstat, WAIT_DRQ)) {
- printk(KERN_ERR "%s: no DRQ after issuing %s\n",
- drive->name,
- drive->addressing ? "MULTWRITE_EXT" : "MULTWRITE");
+ drive->bad_wstat, WAIT_DRQ)) {
+ printk(KERN_ERR "%s: no DRQ after issuing WRITE%s\n",
+ drive->name, drive->addressing ? "_EXT" : "");
return startstop;
}
-#ifdef ALTERNATE_STATE_DIAGRAM_MULTI_OUT
-
- do {
- nsect = rq->current_nr_sectors;
- if (nsect > msect)
- nsect = msect;
- pBuf = task_map_rq(rq, &flags);
- DTF("Pre-Multiwrite: %p, nsect: %d, msect: %d, " \
- "rq->current_nr_sectors: %ld\n",
- pBuf, nsect, msect, rq->current_nr_sectors);
- msect -= nsect;
- taskfile_output_data(drive, pBuf, nsect * SECTOR_WORDS);
- task_unmap_rq(rq, pBuf, &flags);
- rq->current_nr_sectors -= nsect;
- if (!rq->current_nr_sectors) {
- if (!DRIVER(drive)->end_request(drive, 1, 0))
- if (!rq->bio) {
- stat = hwif->INB(IDE_STATUS_REG);
- return ide_stopped;
- }
- }
- } while (msect);
- rq->errors = 0;
- return ide_started;
-#else /* ! ALTERNATE_STATE_DIAGRAM_MULTI_OUT */
- if (!(drive_is_ready(drive))) {
- int i;
- for (i=0; i<100; i++) {
- if (drive_is_ready(drive))
- break;
- }
- }
- /*
- * WARNING :: if the drive as not acked good status we may not
- * move the DATA-TRANSFER T-Bar as BSY != 0. <andre@linux-ide.org>
- */
- return args->handler(drive);
-#endif /* ALTERNATE_STATE_DIAGRAM_MULTI_OUT */
+ return task_out_intr(drive);
}
+EXPORT_SYMBOL(pre_task_out_intr);
-EXPORT_SYMBOL(pre_task_mulout_intr);
-
-/*
- * FIXME before enabling in 2.4 ... DATA integrity issue upon error.
- */
/*
- * Handler for command write multiple
- * Called directly from execute_drive_cmd for the first bunch of sectors,
- * afterwards only by the ISR
+ * Handler for command with PIO data-out phase (Write Multiple).
*/
ide_startstop_t task_mulout_intr (ide_drive_t *drive)
{
- ide_hwif_t *hwif = HWIF(drive);
- u8 stat = hwif->INB(IDE_STATUS_REG);
- struct request *rq = HWGROUP(drive)->rq;
- char *pBuf = NULL;
- ide_startstop_t startstop = ide_stopped;
- unsigned int msect = drive->mult_count;
+ struct request *rq = HWGROUP(drive)->rq;
+ unsigned int msect = drive->mult_count;
unsigned int nsect;
- unsigned long flags;
+ u8 stat;
- /*
- * (ks/hs): Handle last IRQ on multi-sector transfer,
- * occurs after all data was sent in this chunk
- */
- if (rq->current_nr_sectors == 0) {
- if (stat & (ERR_STAT|DRQ_STAT)) {
- if (!rq->bio) {
- rq->current_nr_sectors += drive->mult_count;
- /*
- * NOTE: could rewind beyond beginning :-/
- */
- } else {
- printk(KERN_ERR "%s: MULTI-WRITE assume all data " \
- "transfered is bad status=0x%02x\n",
- drive->name, stat);
- }
- return DRIVER(drive)->error(drive, "task_mulout_intr", stat);
+ stat = HWIF(drive)->INB(IDE_STATUS_REG);
+ if (!OK_STAT(stat, DRIVE_READY, drive->bad_wstat)) {
+ if ((stat & (ERR_STAT | DRQ_STAT)) ||
+ ((stat & WRERR_STAT) && !drive->nowerr))
+ return DRIVER(drive)->error(drive, __FUNCTION__, stat);
+ if (stat & BUSY_STAT) {
+ /* Not ready yet, so wait for another IRQ. */
+ ide_set_handler(drive, &task_mulout_intr, WAIT_WORSTCASE, NULL);
+ return ide_started;
}
- if (!rq->bio)
- DRIVER(drive)->end_request(drive, 1, 0);
- return startstop;
}
- /*
- * DON'T be lazy code the above and below togather !!!
+
+ /* Deal with unexpected ATA data phase. */
+ if ((!(stat & DATA_READY) && rq->nr_sectors) ||
+ ((stat & DATA_READY) && !rq->nr_sectors))
+ return DRIVER(drive)->error(drive, __FUNCTION__, stat);
+
+ /*
+ * Complete previously submitted bios (if any).
+ * Status was already verifyied.
*/
- if (!OK_STAT(stat,DATA_READY,BAD_R_STAT)) {
- if (stat & (ERR_STAT|DRQ_STAT)) {
- if (!rq->bio) {
- rq->current_nr_sectors += drive->mult_count;
- /*
- * NOTE: could rewind beyond beginning :-/
- */
- } else {
- printk("%s: MULTI-WRITE assume all data " \
- "transfered is bad status=0x%02x\n",
- drive->name, stat);
- }
- return DRIVER(drive)->error(drive, "task_mulout_intr", stat);
- }
- /* no data yet, so wait for another interrupt */
- if (HWGROUP(drive)->handler == NULL)
- ide_set_handler(drive, &task_mulout_intr, WAIT_WORSTCASE, NULL);
- return ide_started;
+ while (rq->bio != rq->cbio)
+ if (!DRIVER(drive)->end_request(drive, 1, bio_sectors(rq->bio)))
+ return ide_stopped;
+ /* Complete rq->buffer based request (ioctls). */
+ if (!rq->bio && !rq->nr_sectors) {
+ ide_end_drive_cmd(drive, stat, HWIF(drive)->INB(IDE_ERROR_REG));
+ return ide_stopped;
}
-#ifndef ALTERNATE_STATE_DIAGRAM_MULTI_OUT
- if (HWGROUP(drive)->handler != NULL) {
- unsigned long lflags;
- spin_lock_irqsave(&ide_lock, lflags);
- HWGROUP(drive)->handler = NULL;
- del_timer(&HWGROUP(drive)->timer);
- spin_unlock_irqrestore(&ide_lock, lflags);
- }
-#endif /* ALTERNATE_STATE_DIAGRAM_MULTI_OUT */
+ /* Still data left to transfer. */
+ ide_set_handler(drive, &task_mulout_intr, WAIT_WORSTCASE, NULL);
+ rq->errors = 0;
do {
nsect = rq->current_nr_sectors;
if (nsect > msect)
nsect = msect;
- pBuf = task_map_rq(rq, &flags);
- DTF("Multiwrite: %p, nsect: %d, msect: %d, " \
- "rq->current_nr_sectors: %ld\n",
- pBuf, nsect, msect, rq->current_nr_sectors);
- msect -= nsect;
- taskfile_output_data(drive, pBuf, nsect * SECTOR_WORDS);
- task_unmap_rq(rq, pBuf, &flags);
- rq->current_nr_sectors -= nsect;
- /*
- * FIXME :: We really can not legally get a new page/bh
- * regardless, if this is the end of our segment.
- * BH walking or segment can only be updated after we
- * have a good hwif->INB(IDE_STATUS_REG); return.
- */
- if (!rq->current_nr_sectors) {
- if (!DRIVER(drive)->end_request(drive, 1, 0))
- if (!rq->bio)
- return ide_stopped;
- }
+
+ task_sectors(drive, rq, nsect, PIO_OUT);
+
+ if (!rq->nr_sectors)
+ msect = 0;
+ else
+ msect -= nsect;
+
} while (msect);
- rq->errors = 0;
- if (HWGROUP(drive)->handler == NULL)
- ide_set_handler(drive, &task_mulout_intr, WAIT_WORSTCASE, NULL);
+
return ide_started;
}
-
EXPORT_SYMBOL(task_mulout_intr);
+ide_startstop_t pre_task_mulout_intr (ide_drive_t *drive, struct request *rq)
+{
+ ide_startstop_t startstop;
+
+ if (ide_wait_stat(&startstop, drive, DATA_READY,
+ drive->bad_wstat, WAIT_DRQ)) {
+ printk(KERN_ERR "%s: no DRQ after issuing MULTWRITE%s\n",
+ drive->name, drive->addressing ? "_EXT" : "");
+ return startstop;
+ }
+
+ return task_mulout_intr(drive);
+}
+EXPORT_SYMBOL(pre_task_mulout_intr);
+
/* Called by internal to feature out type of command being called */
//ide_pre_handler_t * ide_pre_handler_parser (task_struct_t *taskfile, hob_struct_t *hobfile)
ide_pre_handler_t * ide_pre_handler_parser (struct hd_drive_task_hdr *taskfile, struct hd_drive_hob_hdr *hobfile)
@@ -1092,11 +986,12 @@ int ide_diag_taskfile (ide_drive_t *driv
*/
if (args->command_type != IDE_DRIVE_TASK_NO_DATA) {
if (data_size == 0)
- rq.current_nr_sectors = rq.nr_sectors = (args->hobRegister[IDE_NSECTOR_OFFSET_HOB] << 8) | args->tfRegister[IDE_NSECTOR_OFFSET];
- /* rq.hard_cur_sectors */
+ rq.nr_sectors = (args->hobRegister[IDE_NSECTOR_OFFSET_HOB] << 8) | args->tfRegister[IDE_NSECTOR_OFFSET];
else
- rq.current_nr_sectors = rq.nr_sectors = data_size / SECTOR_SIZE;
- /* rq.hard_cur_sectors */
+ rq.nr_sectors = data_size / SECTOR_SIZE;
+
+ rq.hard_nr_sectors = rq.nr_sectors;
+ rq.hard_cur_sectors = rq.current_nr_sectors = rq.nr_sectors;
}
if (args->tf_out_flags.all == 0) {
diff -puN include/linux/blkdev.h~ide_tf_pio_handlers include/linux/blkdev.h
--- linux-2.5.69-bk10/include/linux/blkdev.h~ide_tf_pio_handlers Fri May 16 00:44:50 2003
+++ linux-2.5.69-bk10-root/include/linux/blkdev.h Fri May 16 00:46:34 2003
@@ -456,6 +456,7 @@ extern void blk_queue_invalidate_tags(re
extern void blk_congestion_wait(int rw, long timeout);
extern void blk_rq_bio_prep(request_queue_t *, struct request *, struct bio *);
+extern void blk_rq_prep_restart(struct request *);
#define MAX_PHYS_SEGMENTS 128
#define MAX_HW_SEGMENTS 128
diff -puN include/linux/ide.h~ide_tf_pio_handlers include/linux/ide.h
--- linux-2.5.69-bk10/include/linux/ide.h~ide_tf_pio_handlers Fri May 16 00:24:01 2003
+++ linux-2.5.69-bk10-root/include/linux/ide.h Fri May 16 00:24:01 2003
@@ -820,6 +820,26 @@ typedef struct ide_dma_ops_s {
#define ide_rq_offset(rq) \
(((rq)->hard_cur_sectors - (rq)->current_nr_sectors) << 9)
+static inline void *task_map_rq(struct request *rq, unsigned long *flags)
+{
+ /*
+ * fs request
+ */
+ if (rq->cbio)
+ return rq_map_buffer(rq, flags);
+
+ /*
+ * task request
+ */
+ return rq->buffer + blk_rq_offset(rq);
+}
+
+static inline void task_unmap_rq(struct request *rq, char *buffer, unsigned long *flags)
+{
+ if (rq->cbio)
+ rq_unmap_buffer(buffer, flags);
+}
+
/*
* taskfiles really should use hard_cur_sectors as well!
*/
_
-
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