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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-10-10 22:39:36 +0200
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-10-10 22:39:36 +0200
commitacaa0f5f675ccf6b8a3a11a933419068b1ea1f46 (patch)
tree8afee71c69bf765a5edd0de82c98c6470905ec20 /drivers/ide
parentc860f955681ebd83df4a03089f1910fc4b54651f (diff)
ide: add ide_io_buffers() helper
* Make ->io_buffers method return number of bytes transferred. * Use ide_end_request() instead of idefloppy_end_request() in ide_floppy_io_buffers() and then move the call out to ide_pc_intr(). * Add ide_io_buffers() helper and convert ide-{floppy,scsi}.c to use it instead of ide*_io_buffers(). There should be no functional changes caused by this patch. Acked-by: Borislav Petkov <petkovbb@gmail.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide')
-rw-r--r--drivers/ide/ide-atapi.c63
-rw-r--r--drivers/ide/ide-floppy.c47
-rw-r--r--drivers/ide/ide-tape.c4
3 files changed, 63 insertions, 51 deletions
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 61c52fb665c..3d44b45650f 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -61,12 +61,62 @@ int ide_check_atapi_device(ide_drive_t *drive, const char *s)
}
EXPORT_SYMBOL_GPL(ide_check_atapi_device);
+/* PIO data transfer routine using the scatter gather table. */
+int ide_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
+ unsigned int bcount, int write)
+{
+ ide_hwif_t *hwif = drive->hwif;
+ const struct ide_tp_ops *tp_ops = hwif->tp_ops;
+ xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
+ struct scatterlist *sg = pc->sg;
+ char *buf;
+ int count, done = 0;
+
+ while (bcount) {
+ count = min(sg->length - pc->b_count, bcount);
+
+ if (PageHighMem(sg_page(sg))) {
+ unsigned long flags;
+
+ local_irq_save(flags);
+ buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
+ xf(drive, NULL, buf + pc->b_count, count);
+ kunmap_atomic(buf - sg->offset, KM_IRQ0);
+ local_irq_restore(flags);
+ } else {
+ buf = sg_virt(sg);
+ xf(drive, NULL, buf + pc->b_count, count);
+ }
+
+ bcount -= count;
+ pc->b_count += count;
+ done += count;
+
+ if (pc->b_count == sg->length) {
+ if (!--pc->sg_cnt)
+ break;
+ pc->sg = sg = sg_next(sg);
+ pc->b_count = 0;
+ }
+ }
+
+ if (bcount) {
+ printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name,
+ bcount, write ? "padding with zeros"
+ : "discarding data");
+ ide_pad_transfer(drive, write, bcount);
+ }
+
+ return done;
+}
+EXPORT_SYMBOL_GPL(ide_io_buffers);
+
/* TODO: unify the code thus making some arguments go away */
ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,
void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *),
- void (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
+ int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
{
ide_hwif_t *hwif = drive->hwif;
struct request *rq = hwif->hwgroup->rq;
@@ -219,9 +269,14 @@ cmd_finished:
if ((drive->media == ide_floppy && !scsi && !pc->buf) ||
(drive->media == ide_tape && !scsi && pc->bh) ||
- (scsi && pc->sg))
- io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
- else
+ (scsi && pc->sg)) {
+ int done = io_buffers(drive, pc, bcount,
+ !!(pc->flags & PC_FLAG_WRITING));
+
+ /* FIXME: don't do partial completions */
+ if (drive->media == ide_floppy && !scsi)
+ ide_end_request(drive, 1, done >> 9);
+ } else
xferfunc(drive, NULL, pc->cur_pos, bcount);
/* Update the current position */
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index a0a8ad3a303..38dca45ffd1 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -208,51 +208,6 @@ static int idefloppy_end_request(ide_drive_t *drive, int uptodate, int nsecs)
return 0;
}
-static void ide_floppy_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
- unsigned int bcount, int direction)
-{
- ide_hwif_t *hwif = drive->hwif;
- const struct ide_tp_ops *tp_ops = hwif->tp_ops;
- xfer_func_t *xf = direction ? tp_ops->output_data : tp_ops->input_data;
- struct scatterlist *sg = pc->sg;
- char *buf;
- int count, done = 0;
-
- while (bcount) {
- count = min(sg->length - pc->b_count, bcount);
- if (PageHighMem(sg_page(sg))) {
- unsigned long flags;
-
- local_irq_save(flags);
- buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
- xf(drive, NULL, buf + pc->b_count, count);
- kunmap_atomic(buf - sg->offset, KM_IRQ0);
- local_irq_restore(flags);
- } else {
- buf = sg_virt(sg);
- xf(drive, NULL, buf + pc->b_count, count);
- }
- bcount -= count;
- pc->b_count += count;
- done += count;
-
- if (pc->b_count == sg->length) {
- if (!--pc->sg_cnt)
- break;
- pc->sg = sg = sg_next(sg);
- pc->b_count = 0;
- }
- }
-
- idefloppy_end_request(drive, 1, done >> 9);
-
- if (bcount) {
- printk(KERN_ERR "%s: leftover data in %s, bcount == %d\n",
- drive->name, __func__, bcount);
- ide_pad_transfer(drive, direction, bcount);
- }
-}
-
static void idefloppy_update_buffers(ide_drive_t *drive,
struct ide_atapi_pc *pc)
{
@@ -356,7 +311,7 @@ static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
return ide_pc_intr(drive, floppy->pc, idefloppy_pc_intr,
IDEFLOPPY_WAIT_CMD, NULL, idefloppy_update_buffers,
- idefloppy_retry_pc, NULL, ide_floppy_io_buffers);
+ idefloppy_retry_pc, NULL, ide_io_buffers);
}
/*
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index ba05e03f482..d4a9c471dd1 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -693,13 +693,15 @@ static void ide_tape_handle_dsc(ide_drive_t *drive)
idetape_postpone_request(drive);
}
-static void ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
+static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
unsigned int bcount, int write)
{
if (write)
idetape_output_buffers(drive, pc, bcount);
else
idetape_input_buffers(drive, pc, bcount);
+
+ return bcount;
}
/*