When ata_qc_issue() fails, the qc might have been dma mapped or not.
So, performing only ata_qc_free() results in dma map leak.  This patch
makes ata_qc_issue() mark dma map flags correctly on failure and calls
ata_qc_complete() after ata_qc_issue() fails.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

qc used to be freed automatically on command completion.  However, as
a qc can carry information about its completion status, it can be
useful to its owner/issuer after command completion.  This patch makes
freeing qc responsibility of its owner.  This simplifies
ata_exec_internal() and makes command turn-around for atapi request
sensing less hackish.

This change was originally suggested by Jeff Garzik.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

This patch adds suspend patch to libata, and ata_piix in particular. For
most low level drivers, they should just need to add the 4 hooks to
work. As I can only test ata_piix, I didn't enable it for more
though.

Suspend support is the single most important feature on a notebook, and
most new notebooks have sata drives. It's quite embarrassing that we
_still_ do not support this. Right now, it's perfectly possible to
suspend the drive in mid-transfer.
Signed-off-by: NJens Axboe <axboe@suse.de>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJens Axboe <axboe@suse.de>

The following patch prevents libata from incorrectly modifying inquiry
VPD pages and command support data from ATAPI devices.  I have tested
the patch with a SATA ATAPI tape drive on an AHCI controller.

Patch is against kernel 2.4.32 with 2.4.32-libata1.patch applied.

Anthony J. Battersby
Cybernetics
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Some hardware does not support the PACKET command at all.
Other hardware supports ATAPI, but the driver does something nasty such
as calling BUG() when an ATAPI command is issued.

For these such cases, we mark them with a new flag, ATA_FLAG_NO_ATAPI.

Initial version contributed by Ben Collins.

  - remove err_mask from the parameter list of the complete functions
  - move err_mask to ata_queued_cmd
  - initialize qc->err_mask when needed
  - for each function call to ata_qc_complete(), replace the err_mask parameter with qc->err_mask.
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>

===============
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

This patch makes ata_scsi_pass_thru() properly set result code and
sense data on translation failures.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Hi,

the patch below marks several libata (and libata-driver) structures
const so that they end up in the .rodata segment and don't false-share
cachelines with things that get dirtied often.
Signed-off-by: NArjan van de Ven <arjan@infradead.org>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

- Move ATAPI check-condition handling out of the timeout handler
- Use multi-qc-issue feature to issue REQUEST SENSE ATAPI PACKET
  command upon receiving an ATAPI check-condition.

This cleans things up a lot, and eliminates a nasty recursion bug.

scsi_wait_req does not exist any more in the SCSI layer.  This patch
makes it so libata can compile again.
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Fix all reported kernel-doc errors in libata.
Signed-off-by: NRandy Dunlap <rdunlap@xenotime.net>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

A lot of power packed into a little patch.

This change eliminates the sharing between our controller-wide spinlock
and the SCSI core's Scsi_Host lock.  As the locking in libata was
already highly compartmentalized, always referencing our own lock, and
never scsi_host::host_lock.

As a side effect, this change eliminates a deadlock from calling
scsi_finish_command() while inside our spinlock.

The second argument to ata_qc_complete() was being used for two
purposes: communicate the ATA Status register to the completion
function, and indicate an error.  On legacy PCI IDE hardware, the latter
is often implicit in the former.  On more modern hardware, the driver
often completely emulated a Status register value, passing ATA_ERR as an
indication that something went wrong.

Now that previous code changes have eliminated the need to use drv_stat
arg to communicate the ATA Status register value, we can convert it to a
mask of possible error classes.

This will lead to more flexible error handling in the future.

  - move default mode pages to the front of libata-scsi.c
    so various functions can access them
  - partial annotation of these pages, point out divergence
    from sat-r06
  - replace various mode page magic numbers with defines
  - strengthen MODE SENSE command decoding: handle DBD
    bit in cdb, yield block descriptor (per sat-r06) and
    handle mode sub pages
Signed-off-by: NDouglas Gilbert <dougg@torque.net>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Enforce access rules where appropriate.

If the compiler is smart enough, this may buy us an optimization or two
as a side effect.

     - add lba_28_ok() and lba_48_ok() to ata.h.
     - check ending block number instead of staring block number.
     - use lba_28_ok() for CHS range check
     - LBA28/LBA48 optimization

Suggested by Mark Lord and Alan Cox.
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>

=====
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

     - merge ata_prot_to_cmd() and ata_dev_set_protocol() as
       ata_rwcmd_protocol()
     - pave road for read/write multiple support
     - remove usage of pre-cached command and protocol values and call
       ata_rwcmd_protocol() instead
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>

==============
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

   move the initialization of taskfile LBA flags
     "ATA_TFLAG_LBA" and "ATA_TFLAG_LBA48 flags"
   to the SCSI translation functions
Signed-off-by: NAlbert Lee <albertcc@tw.ibm.com>

=============
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

  - change "xlat" and "fill" actors in libata-scsi so
    they are responsible for SCSI status and sense data
    when they return 1. This allows GOOD status or a
    specialized error to be set.
  - yield an error for mode sense requests for saved
    values [sat-r06]
  - remove static inlines for ata_bad_scsiop() and
    ata_bad_cdb() which are no longer used
Signed-off-by: NDouglas Gilbert <dougg@torque.net>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

  - add extern ata_scsi_set_sense() to build SCSI
    fixed sense data and corresponding SCSI status
Signed-off-by: NDouglas Gilbert <dougg@torque.net>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

A few code shuffles, to make merging future code easier.

Add (DRIVER_SENSE << 24) to certain result codes, as noted by Douglas
Gilbert.

No content changes, just moving code around.

1) note urgent bug, that completes command twice

2) only fix up INQUIRY data if the SCSI version is zero (typically
indicates ATAPI MMC-ish device)

3) if there is a problem on the ATA bus, don't bother with REQUEST
SENSE, just directly handle the error based on Status/Error registers.

ATAPI needs to be padded to next 4 byte boundary, if misaligned.

Original work by me, many fixes from Tejun Heo.

move the redundant SCSI lba and transfer length calculation code from
ata_scsi_verify_xlat() and ata_scsi_rw_xlat() to common functions.

Since our max_lun is unconditionally set to 1, we might as well
hardcode a LUN 0 probe, rather than a wildcard LUN scan.

The ide-scsi driver sets max_lun to a value greater than under
certain conditions:

        if ((drive->id->last_lun & 0x7) != 7)
                host->max_lun = (drive->id->last_lun & 0x7) + 1;
        else
                host->max_lun = 1;

last_lun is Word 126 of IDENTIFY PACKET DEVICE, marked as obsolete
and undocumented in non-ancient specs.  We'll leave it out for now.
Should the need arise to support multi-LUN ATAPI devices, we'll
probably want to add the above code.

Finally, there have been reports of REPORT LUNS commands locking up
ATAPI drives.  Eliminating the wildcard LUN scan could help reduce
the trouble from problematic drives.

Replace SCSI's legacy "bang at the door" method of probing with one
directly controlled by the underlying ATA transport layer.

We now only call scsi_scan_target() for devices we find, rather than
probing every possible channel/id within a certain range.

Dumb typo spotted by Mark Lord.

ATAPI is getting close to being ready.  To increase exposure, we enable
the code in the upstream kernel, but default it to off (present
behavior).  Users must pass atapi_enabled=1 as a module option (if
module) or on the kernel command line (if built in) to turn on
discovery of their ATAPI devices.

- changes license of all code from OSL+GPL to plain ole GPL
  - except for NVIDIA, who hasn't yet responded about sata_nv
  - copyright holders were already contacted privately

- adds info in each driver about where hardware/protocol docs may be
  obtained

- where I have made major contributions, updated copyright dates

Fix bugs for unlikely edge cases noticed by Douglas Gilbert:

- When READ(6)/WRITE(6) sector count == 0, treat it as 256 sectors

- For other READ(x)/WRITE(x), when sector count == 0, error.
  We don't support successfully completing zero-length transfers at
  this time.