In an effort to kill libata-specific assert() and use generic
WARN_ON(), this patch converts all assert(X)'s in libata core layer to
WARN_ON(!X)'s. Most conversions are straight-forward logical negation
exception for the followings.
* In libata-core.c:ata_fill_sg(),
assert(qc->n_elem > 0) is converted to WARN_ON(qc->n_elem == 0) because
qc->n_elem is unsigned and unsigned <= 0 is weird.
* In libata-scsi.c:ata_gen_ata_desc/fixed_sense(),
assert(NULL != qc->ap->ops->tf_read) is converted to
WARN_ON(qc->ap->ops->tf_read == NULL), as there are no other users of
'constant cond var' style in libata.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
->eng_timeout cannot be invoked with NULL qc anymore. Add an
assertion in ata_scsi_error() and kill NULL qc handling from all
->eng_timeout callbacks.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Implement ata_scsi_timed_out(), to be used as
scsi_host_template->eh_timed_out callback for all libata drivers.
Without this function, the following race exists.
If a qc completes after SCSI timer expires but before libata EH kicks
in, the qc gets completed but the scsicmd still gets passed to libata
EH resulting in ->eng_timeout invocation with NULL qc, which none is
handling properly.
This patch makes sure that scmd and qc share the same lifetime.
Original idea from Jeff Garzik <jgarzik@pobox.com>.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Add ATA_QCFLAG_EH_SCHEDULED. If this flag is set, the qc is owned by
EH and normal completion path is not allowed to finish it. This patch
doesn't actually use this flag.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
ATA_FLAG_IN_EH flag is set on entry to EH and cleared on completion.
This patch just sets and clears the flag. Following patches will
build normal qc execution / EH synchronization aroung this flag.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This is a merger of libata docs + cleanups from
Martin Waitz <tali@admingilde.org> and me.
From: Randy Dunlap <rdunlap@xenotime.net>
From: Martin Waitz <tali@admingilde.org>
Fix libata kernel-doc comments to match code.
Add some function parameters to kernel-doc.
Fix some typos/spellos.
Put comments in <= 80 columns.
Make one DPRINTK string unique.
Fix sparse cast warnings.
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Implement ata_eh_qc_complete/retry() using scsi_eh_finish_cmd() and
scsi_eh_flush_done_q(). This removes all eh scsicmd finish hacks from
low level drivers.
This change was first suggested by Jeff Garzik.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Return AC_ERR_* mask from issue fuctions instead of 0/-1. This
enables things like failing a qc with AC_ERR_HSM when the device
doesn't set DRDY when the qc is about to be issued.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
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: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff 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: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff 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: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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: Jeff 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: Albert Lee <albertcc@tw.ibm.com>
===============
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This patch makes ata_scsi_pass_thru() properly set result code and
sense data on translation failures.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff 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: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Jeff 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: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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: Douglas Gilbert <dougg@torque.net>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
- 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: Albert Lee <albertcc@tw.ibm.com>
=====
Signed-off-by: Jeff 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: Albert Lee <albertcc@tw.ibm.com>
==============
Signed-off-by: Jeff 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: Albert Lee <albertcc@tw.ibm.com>
=============
Signed-off-by: Jeff 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: Douglas Gilbert <dougg@torque.net>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
- add extern ata_scsi_set_sense() to build SCSI
fixed sense data and corresponding SCSI status
Signed-off-by: Douglas Gilbert <dougg@torque.net>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
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.
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.
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
Tejun Heo