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: NRandy Dunlap <rdunlap@xenotime.net>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

This patch adds support for correctly masking out and knowing about
hotplug events on Promise SATAII150 Tx4/Tx2 Plus controllers.

Also, a kmalloc->kzalloc cleanup.
Signed-off-by: NLuke Kosewski <lkosewsk@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

The previous change failed to properly mask out unrelated bits, which
resulted in a failure to detect devices.

Implement SRST, COMRESET and standard postreset component operations
for ata_drive_probe_reset(), and use these three functions to
implement ata_std_probe_reset.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Most low level drivers share supported reset/classify actions and
sequence.  This patch implements ata_drive_probe_reset() which helps
constructing ->probe_reset from three component operations -
softreset, hardreset and postreset.  This minimizes duplicate code and
yet allows flexibility if needed. The three component operations can
also be shared by EH later.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Add new ->probe_reset operation to ata_port_operations obsoleting
->phy_reset.  The main difference from ->phy_reset is that the new
operation is not allowed to manipulate libata internals directly.
It's not allowed to configure or disable the port or devices.  It can
only succeed or fail and classify attached devices into passed
@classes.

This change gives more control to higher level and eases sharing reset
methods with EH.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Make ata_dev_try_classify take @r_err to store tf error register value
on completion and return device class instead of directly manipulating
dev->class.  This is preparation for new reset mechanism.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Export ata_busy_sleep(), to be used by low level driver reset functions.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Add constants needed to perform SRST.  This is preparation for adding
softreset method.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

AHCI spec mandates engine to be stopped during hard resets.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Wrap pio/atapi task queueing in correspondingly named functions.  This
change doesn't change anything.  It's preparation for follow-up
pio-task/eh sync patch.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff 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: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Export two SCSI EH command handling functions.  To be used by libata EH.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff 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: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Add detailed AC_ERR_* flags and use them.  Long-term goal is to
describe all errors with err_mask and tf combination (tf for failed
sector information, etc...).  After proper error diagnosis is
implemented, sense data should also be generated from err_mask instead
of directly from hardware tf registers as it is currently.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

In ahci_host_intr err_mask is determined from IRQ status but never
used.  This patch sets qc->err_mask to the determined err_mask.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff 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: 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>

All ata_qc_free() does is calling __ata_qc_complete() which isn't used
anywhere else.  Fold __ata_qc_complete() into ata_qc_free().
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

Unlike their older siblings, ICH6 and 7 use different scheme for MAP
VALUE.  This patch makes ata_piix interpret MV properly on ICH6/7.

Pre-ICH6/7

 The value of these bits indicate the address range the SATA port
 responds to, and whether or not the SATA and IDE functions are
 combined.

 000 = Non-combined. P0 is primary master. P1 is secondary master.
 001 = Non-combined. P0 is secondary master. P1 is primary master.
 100 = Combined. P0 is primary master. P1 is primary slave. P-ATA is
       2:0 Map Value secondary.
 101 = Combined. P0 is primary slave. P1 is primary master. P-ATA is
       secondary.
 110 = Combined. P-ATA is primary. P0 is secondary master. P1 is
       secondary slave.
 111 = Combined. P-ATA is primary. P0 is secondary slave. P1 is
       secondary master.

ICH6/7

 Map Value - R/W. Map Value (MV): The value in the bits below indicate
the address range the SATA ports responds to, and whether or not the
PATA and SATA functions are combined. When in combined mode, the AHCI
memory space is not available and AHCI may not be used.

 00 = Non-combined. P0 is primary master, P2 is the primary slave. P1
      is secondary master, P3 is the 1:0 secondary slave (desktop
      only). P0 is primary master, P2 is the primary slave (mobile
      only).
 01 = Combined. IDE is primary. P1 is secondary master, P3 is the
      secondary slave. (desktop only)
 10 = Combined. P0 is primary master. P2 is primary slave. IDE is secondary
 11 = Reserved
Signed-off-by: NTejun Heo <htejun@gmail.com>

--

Jeff, without this patch, ata_piix misdetects my ICH7's combined mode,
ending up not applying bridge limits to PX-710SA and configuring IDE
drive on 40-c cable to UDMA/66.

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

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The compat layer timeout handling changes in:

9f72949f

are busted.  This is most easily seen with an X application
that uses sub-second select/poll timeout such as emacs.  You
hit a key and it takes a second or so before the app responds.

The two ROUND_UP() calls upon entry are using {tv,ts}_sec where it
should instead be using {tv_usec,ts_nsec}, which perfectly explains
the observed incorrect behavior.

Another bug shot down with git bisect.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Or else we break on ppc32 and other 32-bit platforms.

Based upon a patch from Harald Welte.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Fix an unnecessary softlockup watchdog warning in the ia64
uncached_build_memmap() that occurs occasionally at 256p and always at
512p.  The problem occurs at boot time.
Signed-off-by: NJohn Hawkes <hawkes@sgi.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NTony Luck <tony.luck@intel.com>

Migrate perfmon from using an old semaphore to a completion handler.
Signed-off-by: NJes Sorensen <jes@sgi.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NTony Luck <tony.luck@intel.com>

Migrate arch/ia64/ia32/sys_ia32 to using a mutex for mmap protection.
Signed-off-by: NJes Sorensen <jes@sgi.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NTony Luck <tony.luck@intel.com>

This also includes by necessity _TIF_RESTORE_SIGMASK support,
which actually resulted in a lot of cleanups.

The sparc signal handling code is quite a mess and I should
clean it up some day.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

some driver clean ups, and a re-posting of changes that are needed

to match the updated TPS.
Signed-off-by: NMark Gross <mark.gross@intel.com>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This is a subset of the bluesmoke project core code, stripped of the NMI work
which isn't ready to merge and some of the "interesting" proc functionality
that needs reworking or just has no place in kernel.  It requires no core
kernel changes except the added scrub functions already posted.

The goal is to merge further functionality only after the core code is
accepted and proven in the base kernel, and only at the point the upstream
extras are really ready to merge.

From: doug thompson <norsk5@xmission.com>

  This converts EDAC to sysfs and is the final chunk neccessary before EDAC
  has a stable user space API and can be considered for submission into the
  base kernel.
Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NAdrian Bunk <bunk@stusta.de>
Signed-off-by: NJesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Ndoug thompson <norsk5@xmission.com>
Signed-off-by: NPavel Machek <pavel@suse.cz>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

EDAC requires a way to scrub memory if an ECC error is found and the chipset
does not do the work automatically.  That means rewriting memory locations
atomically with respect to all CPUs _and_ bus masters.  That means we can't
use atomic_add(foo, 0) as it gets optimised for non-SMP

This adds a function to include/asm-foo/atomic.h for the platforms currently
supported which implements a scrub of a mapped block.

It also adjusts a few other files include order where atomic.h is included
before types.h as this now causes an error as atomic_scrub uses u32.
Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>