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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-01-26 20:13:09 +0100
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-01-26 20:13:09 +0100
commit9e47be0c97f7357b80e91dc0632e9cce2eb025e0 (patch)
tree7047b2b3c9ac094b801d376e4bbb95292b1962ac
parent3a5015cc9d7051ce8e706ef48276d8484aac0c4b (diff)
ide: remove broken disk byte-swapping support
Remove broken disk byte-swapping support: - it can cause a data corruption on SMP (or if using PREEMPT on UP) - all data coming from disk are byte-swapped by taskfile_*_data() which results in incorrect identify data being reported by /proc/ide/ and IOCTLs - "hdx=bswap/byteswap" kernel parameter has been broken on m68k host drivers (including Atari/Q40 ones) since 2.5.x days (because of 'hwif' zero-ing) - byte-swapping is limited to PIO transfers (for working with TiVo disks on x86 machines using user-space solutions or dm-byteswap should result in much better performance because DMA can be used) For previous discussions please see: http://www.ussg.iu.edu/hypermail/linux/kernel/0201.0/0768.html http://lkml.org/lkml/2004/2/28/111 [ I have dm-byteswap device mapper target if somebody is interested (patch is for 2.6.4 though but I'll dust it off if needed). ] Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
-rw-r--r--Documentation/ide.txt4
-rw-r--r--drivers/ide/ide-disk.c1
-rw-r--r--drivers/ide/ide-taskfile.c32
-rw-r--r--drivers/ide/ide.c6
-rw-r--r--include/linux/ide.h1
5 files changed, 3 insertions, 41 deletions
diff --git a/Documentation/ide.txt b/Documentation/ide.txt
index b29ccb43d6c..94e2e3b9e77 100644
--- a/Documentation/ide.txt
+++ b/Documentation/ide.txt
@@ -244,10 +244,6 @@ Summary of ide driver parameters for kernel command line
"hdx=nodma" : disallow DMA
- "hdx=swapdata" : when the drive is a disk, byte swap all data
-
- "hdx=bswap" : same as above..........
-
"hdx=scsi" : the return of the ide-scsi flag, this is useful for
allowing ide-floppy, ide-tape, and ide-cdrom|writers
to use ide-scsi emulation on a device specific option.
diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index c1fb75c387e..041be43a62c 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -761,7 +761,6 @@ static void idedisk_add_settings(ide_drive_t *drive)
ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
ide_add_setting(drive, "address", SETTING_RW, TYPE_BYTE, 0, 2, 1, 1, &drive->addressing, set_lba_addressing);
- ide_add_setting(drive, "bswap", SETTING_READ, TYPE_BYTE, 0, 1, 1, 1, &drive->bswap, NULL);
ide_add_setting(drive, "multcount", SETTING_RW, TYPE_BYTE, 0, id->max_multsect, 1, 1, &drive->mult_count, set_multcount);
ide_add_setting(drive, "nowerr", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->nowerr, set_nowerr);
ide_add_setting(drive, "lun", SETTING_RW, TYPE_INT, 0, 7, 1, 1, &drive->lun, NULL);
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index c58edc86ed3..3ecafab8f54 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -35,34 +35,6 @@
#include <asm/uaccess.h>
#include <asm/io.h>
-static void ata_bswap_data (void *buffer, int wcount)
-{
- u16 *p = buffer;
-
- while (wcount--) {
- *p = *p << 8 | *p >> 8; p++;
- *p = *p << 8 | *p >> 8; p++;
- }
-}
-
-static void taskfile_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
-{
- HWIF(drive)->ata_input_data(drive, buffer, wcount);
- if (drive->bswap)
- ata_bswap_data(buffer, wcount);
-}
-
-static void taskfile_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
-{
- if (drive->bswap) {
- ata_bswap_data(buffer, wcount);
- HWIF(drive)->ata_output_data(drive, buffer, wcount);
- ata_bswap_data(buffer, wcount);
- } else {
- HWIF(drive)->ata_output_data(drive, buffer, wcount);
- }
-}
-
void ide_tf_load(ide_drive_t *drive, ide_task_t *task)
{
ide_hwif_t *hwif = drive->hwif;
@@ -352,9 +324,9 @@ static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
/* do the actual data transfer */
if (write)
- taskfile_output_data(drive, buf, SECTOR_WORDS);
+ hwif->ata_output_data(drive, buf, SECTOR_WORDS);
else
- taskfile_input_data(drive, buf, SECTOR_WORDS);
+ hwif->ata_input_data(drive, buf, SECTOR_WORDS);
kunmap_atomic(buf, KM_BIO_SRC_IRQ);
#ifdef CONFIG_HIGHMEM
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index 5f3e53ec583..52115ef1f01 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -1303,7 +1303,7 @@ static int __init ide_setup(char *s)
if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
const char *hd_words[] = {
"none", "noprobe", "nowerr", "cdrom", "nodma",
- "autotune", "noautotune", "minus8", "swapdata", "bswap",
+ "autotune", "noautotune", "-8", "-9", "-10",
"noflush", "remap", "remap63", "scsi", NULL };
unit = s[2] - 'a';
hw = unit / MAX_DRIVES;
@@ -1339,10 +1339,6 @@ static int __init ide_setup(char *s)
case -7: /* "noautotune" */
drive->autotune = IDE_TUNE_NOAUTO;
goto obsolete_option;
- case -9: /* "swapdata" */
- case -10: /* "bswap" */
- drive->bswap = 1;
- goto done;
case -11: /* noflush */
drive->noflush = 1;
goto done;
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 74f1ef9c6d9..f94cf036bd9 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -394,7 +394,6 @@ typedef struct ide_drive_s {
u8 state; /* retry state */
u8 waiting_for_dma; /* dma currently in progress */
u8 unmask; /* okay to unmask other irqs */
- u8 bswap; /* byte swap data */
u8 noflush; /* don't attempt flushes */
u8 dsc_overlap; /* DSC overlap */
u8 nice1; /* give potential excess bandwidth */