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Date: Mon, 7 Apr 2008 21:13:42 +0200
From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: linux-ide@...r.kernel.org,
Linux Kernel Development <linux-kernel@...r.kernel.org>,
Linux/m68k <linux-m68k@...r.kernel.org>,
Michael Schmitz <schmitz@...ian.org>
Subject: Re: [PATCH 5/5] falconide/q40ide: add ->atapi_*put_bytes and ->ata_*put_data methods
On Monday 31 March 2008, Geert Uytterhoeven wrote:
> On Sun, 30 Mar 2008, Bartlomiej Zolnierkiewicz wrote:
> > On Sunday 30 March 2008, Geert Uytterhoeven wrote:
> > > On Sun, 30 Mar 2008, Bartlomiej Zolnierkiewicz wrote:
> > > > * Add ->atapi_{in,out}put_bytes and ->ata_{in,out}put_data methods to
> > > > falconide and q40ide host drivers (->ata_* methods are implemented on
> > > > top of ->atapi_* methods so they also do byte-swapping now).
> > > >
> > > > * Cleanup atapi_{in,out}put_bytes().
> > >
> > > Thanks!
> > >
> > > One remaining issue (for which the fix has never been submitted upstream so
> > > far) with Atari and Q40 is that due to the byteswapped interface, the driveid
> > > is also byteswapped, so it has to be unswapped again in ide_fix_driveid().
> >
> > My patch causes unswapping for _all_ data coming from the device so I wonder
> > whether the ide_fix_driveid() fix is still needed?
>
> I'll give it a try on Aranym...
>
> > [ I now recall some discussion that we shouldn't un-swap fs requests because
> > of how the things were done in the past fs itself is stored byte-swapped on
> > the disk - if this is the case I will recast the patch to pass rq to
> > ->ata_*put_data in ide_pio_sector() and check rq->cmd_type == REQ_TYPE_FS
> > in falconide/q40ide_*put_data() to decide whether to unswap data or not ]
>
> Yes, the data on the disk is stored byte-swapped.
> So it's only the drive ID and packet commands that should be swapped.
"take 2" against IDE tree follows
[ I hope to merge it into IDE tree tomorrow if people are fine with it. ]
From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Subject: [PATCH] falconide/q40ide: add ->atapi_*put_bytes and ->ata_*put_data methods (take 2)
* Add ->atapi_{in,out}put_bytes and ->ata_{in,out}put_data methods to
falconide and q40ide host drivers (->ata_* methods are implemented on
top of ->atapi_* methods so they also do byte-swapping now).
* Cleanup atapi_{in,out}put_bytes().
v2:
* Add 'struct request *rq' argument to ->ata_{in,out}put_data methods
and don't byte-swap disk fs requests (we shouldn't un-swap fs requests
because fs itself is stored byte-swapped on the disk) - this is how
things were done before the patch (ideally device mapper should be
used instead but it would break existing setups and would have some
performance impact).
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Michael Schmitz <schmitz@...ian.org>
Cc: Roman Zippel <zippel@...ux-m68k.org>
Cc: Alan Cox <alan@...rguk.ukuu.org.uk>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
PS no point in adding rq to ->atapi* methods as the next patch in series
merges ->ata* and ->atapi* methods
drivers/ide/cris/ide-cris.c | 14 ++++++++------
drivers/ide/ide-io.c | 2 +-
drivers/ide/ide-iops.c | 26 +++++++-------------------
drivers/ide/ide-probe.c | 2 +-
drivers/ide/ide-taskfile.c | 16 +++++++++-------
drivers/ide/legacy/falconide.c | 36 ++++++++++++++++++++++++++++++++++++
drivers/ide/legacy/q40ide.c | 34 ++++++++++++++++++++++++++++++++++
include/linux/ide.h | 4 ++--
8 files changed, 98 insertions(+), 36 deletions(-)
Index: b/drivers/ide/cris/ide-cris.c
===================================================================
--- a/drivers/ide/cris/ide-cris.c
+++ b/drivers/ide/cris/ide-cris.c
@@ -673,8 +673,10 @@ cris_ide_inb(unsigned long reg)
return (unsigned char)cris_ide_inw(reg);
}
-static void cris_ide_input_data (ide_drive_t *drive, void *, unsigned int);
-static void cris_ide_output_data (ide_drive_t *drive, void *, unsigned int);
+static void cris_ide_input_data(ide_drive_t *, struct request *,
+ void *, unsigned int);
+static void cris_ide_output_data(ide_drive_t *, struct request *,
+ void *, unsigned int);
static void cris_atapi_input_bytes(ide_drive_t *drive, void *, unsigned int);
static void cris_atapi_output_bytes(ide_drive_t *drive, void *, unsigned int);
@@ -900,8 +902,8 @@ cris_atapi_output_bytes (ide_drive_t *dr
/*
* This is used for most PIO data transfers *from* the IDE interface
*/
-static void
-cris_ide_input_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
+static void cris_ide_input_data(ide_drive_t *drive, struct request *rq,
+ void *buffer, unsigned int wcount)
{
cris_atapi_input_bytes(drive, buffer, wcount << 2);
}
@@ -909,8 +911,8 @@ cris_ide_input_data (ide_drive_t *drive,
/*
* This is used for most PIO data transfers *to* the IDE interface
*/
-static void
-cris_ide_output_data (ide_drive_t *drive, void *buffer, unsigned int wcount)
+static void cris_ide_output_data(ide_drive_t *drive, struct request *,
+ void *buffer, unsigned int wcount)
{
cris_atapi_output_bytes(drive, buffer, wcount << 2);
}
Index: b/drivers/ide/ide-io.c
===================================================================
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -422,7 +422,7 @@ static void try_to_flush_leftover_data (
u32 wcount = (i > 16) ? 16 : i;
i -= wcount;
- HWIF(drive)->ata_input_data(drive, buffer, wcount);
+ drive->hwif->ata_input_data(drive, NULL, buffer, wcount);
}
}
Index: b/drivers/ide/ide-iops.c
===================================================================
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -192,7 +192,8 @@ static void ata_vlb_sync(ide_drive_t *dr
/*
* This is used for most PIO data transfers *from* the IDE interface
*/
-static void ata_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
+static void ata_input_data(ide_drive_t *drive, struct request *rq,
+ void *buffer, u32 wcount)
{
ide_hwif_t *hwif = drive->hwif;
struct ide_io_ports *io_ports = &hwif->io_ports;
@@ -215,7 +216,8 @@ static void ata_input_data(ide_drive_t *
/*
* This is used for most PIO data transfers *to* the IDE interface
*/
-static void ata_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
+static void ata_output_data(ide_drive_t *drive, struct request *rq,
+ void *buffer, u32 wcount)
{
ide_hwif_t *hwif = drive->hwif;
struct ide_io_ports *io_ports = &hwif->io_ports;
@@ -248,14 +250,7 @@ static void atapi_input_bytes(ide_drive_
ide_hwif_t *hwif = HWIF(drive);
++bytecount;
-#if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
- if (MACH_IS_ATARI || MACH_IS_Q40) {
- /* Atari has a byte-swapped IDE interface */
- insw_swapw(hwif->io_ports.data_addr, buffer, bytecount / 2);
- return;
- }
-#endif /* CONFIG_ATARI || CONFIG_Q40 */
- hwif->ata_input_data(drive, buffer, bytecount / 4);
+ hwif->ata_input_data(drive, NULL, buffer, bytecount / 4);
if ((bytecount & 0x03) >= 2)
hwif->INSW(hwif->io_ports.data_addr,
(u8 *)buffer + (bytecount & ~0x03), 1);
@@ -266,14 +261,7 @@ static void atapi_output_bytes(ide_drive
ide_hwif_t *hwif = HWIF(drive);
++bytecount;
-#if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
- if (MACH_IS_ATARI || MACH_IS_Q40) {
- /* Atari has a byte-swapped IDE interface */
- outsw_swapw(hwif->io_ports.data_addr, buffer, bytecount / 2);
- return;
- }
-#endif /* CONFIG_ATARI || CONFIG_Q40 */
- hwif->ata_output_data(drive, buffer, bytecount / 4);
+ hwif->ata_output_data(drive, NULL, buffer, bytecount / 4);
if ((bytecount & 0x03) >= 2)
hwif->OUTSW(hwif->io_ports.data_addr,
(u8 *)buffer + (bytecount & ~0x03), 1);
@@ -668,7 +656,7 @@ int ide_driveid_update(ide_drive_t *driv
local_irq_restore(flags);
return 0;
}
- hwif->ata_input_data(drive, id, SECTOR_WORDS);
+ hwif->ata_input_data(drive, NULL, id, SECTOR_WORDS);
(void)ide_read_status(drive); /* clear drive IRQ */
local_irq_enable();
local_irq_restore(flags);
Index: b/drivers/ide/ide-probe.c
===================================================================
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -126,7 +126,7 @@ static inline void do_identify (ide_driv
id = drive->id;
/* read 512 bytes of id info */
- hwif->ata_input_data(drive, id, SECTOR_WORDS);
+ hwif->ata_input_data(drive, NULL, id, SECTOR_WORDS);
drive->id_read = 1;
local_irq_enable();
Index: b/drivers/ide/ide-taskfile.c
===================================================================
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -283,7 +283,8 @@ static u8 wait_drive_not_busy(ide_drive_
return stat;
}
-static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
+static void ide_pio_sector(ide_drive_t *drive, struct request *rq,
+ unsigned int write)
{
ide_hwif_t *hwif = drive->hwif;
struct scatterlist *sg = hwif->sg_table;
@@ -323,9 +324,9 @@ static void ide_pio_sector(ide_drive_t *
/* do the actual data transfer */
if (write)
- hwif->ata_output_data(drive, buf, SECTOR_WORDS);
+ hwif->ata_output_data(drive, rq, buf, SECTOR_WORDS);
else
- hwif->ata_input_data(drive, buf, SECTOR_WORDS);
+ hwif->ata_input_data(drive, rq, buf, SECTOR_WORDS);
kunmap_atomic(buf, KM_BIO_SRC_IRQ);
#ifdef CONFIG_HIGHMEM
@@ -333,13 +334,14 @@ static void ide_pio_sector(ide_drive_t *
#endif
}
-static void ide_pio_multi(ide_drive_t *drive, unsigned int write)
+static void ide_pio_multi(ide_drive_t *drive, struct request *rq,
+ unsigned int write)
{
unsigned int nsect;
nsect = min_t(unsigned int, drive->hwif->nleft, drive->mult_count);
while (nsect--)
- ide_pio_sector(drive, write);
+ ide_pio_sector(drive, rq, write);
}
static void ide_pio_datablock(ide_drive_t *drive, struct request *rq,
@@ -362,10 +364,10 @@ static void ide_pio_datablock(ide_drive_
switch (drive->hwif->data_phase) {
case TASKFILE_MULTI_IN:
case TASKFILE_MULTI_OUT:
- ide_pio_multi(drive, write);
+ ide_pio_multi(drive, rq, write);
break;
default:
- ide_pio_sector(drive, write);
+ ide_pio_sector(drive, rq, write);
break;
}
Index: b/drivers/ide/legacy/falconide.c
===================================================================
--- a/drivers/ide/legacy/falconide.c
+++ b/drivers/ide/legacy/falconide.c
@@ -44,6 +44,36 @@
int falconide_intr_lock;
EXPORT_SYMBOL(falconide_intr_lock);
+static void falconide_atapi_input_bytes(ide_drive_t *drive, void *buf,
+ unsigned int len)
+{
+ insw_swapw(drive->hwif->io_ports.data_addr, buf, (len + 1) / 2);
+}
+
+static void falconide_atapi_output_bytes(ide_drive_t *drive, void *buf,
+ unsigned int len)
+{
+ outsw_swapw(drive->hwif->io_ports.data_addr, buf, (len + 1) / 2);
+}
+
+static void falconide_ata_input_data(ide_drive_t *drive, struct request *rq,
+ void *buf, unsigned int wcount)
+{
+ if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
+ return insw(drive->hwif->io_ports.data_addr, buf, wcount * 2);
+
+ falconide_atapi_input_bytes(drive, buf, wcount * 4);
+}
+
+static void falconide_ata_output_data(ide_drive_t *drive, struct request *rq,
+ void *buf, unsigned int wcount)
+{
+ if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
+ return outsw(drive->hwif->io_ports.data_addr, buf, wcount * 2);
+
+ falconide_atapi_output_bytes(drive, buf, wcount * 4);
+}
+
static void __init falconide_setup_ports(hw_regs_t *hw)
{
int i;
@@ -89,6 +119,12 @@ static int __init falconide_init(void)
ide_init_port_hw(hwif, &hw);
+ /* Atari has a byte-swapped IDE interface */
+ hwif->atapi_input_bytes = falconide_atapi_input_bytes;
+ hwif->atapi_output_bytes = falconide_atapi_output_bytes;
+ hwif->ata_input_data = falconide_ata_input_data;
+ hwif->ata_output_data = falconide_ata_output_data;
+
ide_get_lock(NULL, NULL);
ide_device_add(idx, NULL);
ide_release_lock();
Index: b/drivers/ide/legacy/q40ide.c
===================================================================
--- a/drivers/ide/legacy/q40ide.c
+++ b/drivers/ide/legacy/q40ide.c
@@ -90,7 +90,35 @@ void q40_ide_setup_ports ( hw_regs_t *hw
hw->ack_intr = ack_intr;
}
+static void q40ide_atapi_input_bytes(ide_drive_t *drive, void *buf,
+ unsigned int len)
+{
+ insw_swapw(drive->hwif->io_ports.data_addr, buf, (len + 1) / 2);
+}
+static void q40ide_atapi_output_bytes(ide_drive_t *drive, void *buf,
+ unsigned int len)
+{
+ outsw_swapw(drive->hwif->io_ports.data_addr, buf, (len + 1) / 2);
+}
+
+static void q40ide_ata_input_data(ide_drive_t *drive, struct request *rq,
+ void *buf, unsigned int wcount)
+{
+ if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
+ return insw(drive->hwif->io_ports.data_addr, buf, wcount * 2);
+
+ q40ide_atapi_input_bytes(drive, buf, wcount * 4);
+}
+
+static void q40ide_ata_output_data(ide_drive_t *drive, struct request *rq,
+ void *buf, unsigned int wcount)
+{
+ if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
+ return outsw(drive->hwif->io_ports.data_addr, buf, wcount * 2);
+
+ q40ide_atapi_output_bytes(drive, buf, wcount * 4);
+}
/*
* the static array is needed to have the name reported in /proc/ioports,
@@ -141,6 +169,12 @@ static int __init q40ide_init(void)
if (hwif) {
ide_init_port_hw(hwif, &hw);
+ /* Q40 has a byte-swapped IDE interface */
+ hwif->atapi_input_bytes = q40ide_atapi_input_bytes;
+ hwif->atapi_output_bytes = q40ide_atapi_output_bytes;
+ hwif->ata_input_data = q40ide_ata_input_data;
+ hwif->ata_output_data = q40ide_ata_output_data;
+
idx[i] = hwif->index;
}
}
Index: b/include/linux/ide.h
===================================================================
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -469,8 +469,8 @@ typedef struct hwif_s {
const struct ide_port_ops *port_ops;
const struct ide_dma_ops *dma_ops;
- void (*ata_input_data)(ide_drive_t *, void *, u32);
- void (*ata_output_data)(ide_drive_t *, void *, u32);
+ void (*ata_input_data)(ide_drive_t *, struct request *, void *, u32);
+ void (*ata_output_data)(ide_drive_t *, struct request *, void *, u32);
void (*atapi_input_bytes)(ide_drive_t *, void *, u32);
void (*atapi_output_bytes)(ide_drive_t *, void *, u32);
--
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