korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-16 08:44:21 +08:00
Code Issues Packages Projects Releases Wiki Activity

ide-floppy: use scatterlists for pio transfers

Browse Source 
Use hwif->sg_table for pio transfers instead of fumbling
with block layer internals in the driver. Also, make debug
statements more informative in .._do_request() while at it.

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
[bart: fixup pc->b_count in idefloppy_blockpc_cmd()]
[bart: add missing include (noticed by Stephen Rothwell)]
[bart: map hwif->sg_{table,nents} on pc->{sg,sg_cnt} (multi-IRQs-per-sg fix)]
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Borislav Petkov 2008-10-10 22:39:35 +02:00 committed by Bartlomiej Zolnierkiewicz
parent f025ffdcc3
commit b98b3409ab
1 changed files with 41 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

66
drivers/ide/ide-floppy.c
View File

@ -36,6 +36,7 @@
#include <linux/hdreg.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <linux/scatterlist.h>
#include <scsi/scsi_ioctl.h>
@ -226,29 +227,36 @@ 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;
struct request *rq = pc->rq;
struct req_iterator iter;
struct bio_vec *bvec;
unsigned long flags;
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;
char *data;
rq_for_each_segment(bvec, rq, iter) {
if (!bcount)
break;
count = min(bvec->bv_len, bcount);
data = bvec_kmap_irq(bvec, &flags);
if (direction)
hwif->tp_ops->output_data(drive, NULL, data, count);
else
hwif->tp_ops->input_data(drive, NULL, data, count);
bvec_kunmap_irq(data, &flags);
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);
@ -571,7 +579,7 @@ static void idefloppy_create_rw_cmd(idefloppy_floppy_t *floppy,
memcpy(rq->cmd, pc->c, 12);
pc->rq = rq;
pc->b_count = cmd == READ ? 0 : rq->bio->bi_size;
pc->b_count = 0;
if (rq->cmd_flags & REQ_RW)
pc->flags |= PC_FLAG_WRITING;
pc->buf = NULL;
@ -585,7 +593,7 @@ static void idefloppy_blockpc_cmd(idefloppy_floppy_t *floppy,
idefloppy_init_pc(pc);
memcpy(pc->c, rq->cmd, sizeof(pc->c));
pc->rq = rq;
pc->b_count = rq->data_len;
pc->b_count = 0;
if (rq->data_len && rq_data_dir(rq) == WRITE)
pc->flags |= PC_FLAG_WRITING;
pc->buf = rq->data;
@ -602,15 +610,17 @@ static ide_startstop_t idefloppy_do_request(ide_drive_t *drive,
struct request *rq, sector_t block_s)
{
idefloppy_floppy_t *floppy = drive->driver_data;
ide_hwif_t *hwif = drive->hwif;
struct ide_atapi_pc *pc;
unsigned long block = (unsigned long)block_s;
debug_log("dev: %s, cmd_type: %x, errors: %d\n",
rq->rq_disk ? rq->rq_disk->disk_name : "?",
rq->cmd_type, rq->errors);
debug_log("sector: %ld, nr_sectors: %ld, "
"current_nr_sectors: %d\n", (long)rq->sector,
rq->nr_sectors, rq->current_nr_sectors);
debug_log("%s: dev: %s, cmd: 0x%x, cmd_type: %x, errors: %d\n",
__func__, rq->rq_disk ? rq->rq_disk->disk_name : "?",
rq->cmd[0], rq->cmd_type, rq->errors);
debug_log("%s: sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
__func__, (long)rq->sector, rq->nr_sectors,
rq->current_nr_sectors);
if (rq->errors >= ERROR_MAX) {
if (floppy->failed_pc)
@ -643,6 +653,12 @@ static ide_startstop_t idefloppy_do_request(ide_drive_t *drive,
return ide_stopped;
}
ide_init_sg_cmd(drive, rq);
ide_map_sg(drive, rq);
pc->sg = hwif->sg_table;
pc->sg_cnt = hwif->sg_nents;
pc->rq = rq;
return idefloppy_issue_pc(drive, pc);