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  1. 27 5月, 2011 1 次提交
    • C
      arch/tile: more /proc and /sys file support · f133ecca
      由 Chris Metcalf 提交于 
      This change introduces a few of the less controversial /proc and
/proc/sys interfaces for tile, along with sysfs attributes for
various things that were originally proposed as /proc/tile files.
It also adjusts the "hardwall" proc API.

Arnd Bergmann reviewed the initial arch/tile submission, which
included a complete set of all the /proc/tile and /proc/sys/tile
knobs that we had added in a somewhat ad hoc way during initial
development, and provided feedback on where most of them should go.

One knob turned out to be similar enough to the existing
/proc/sys/debug/exception-trace that it was re-implemented to use
that model instead.

Another knob was /proc/tile/grid, which reported the "grid" dimensions
of a tile chip (e.g. 8x8 processors = 64-core chip).  Arnd suggested
looking at sysfs for that, so this change moves that information
to a pair of sysfs attributes (chip_width and chip_height) in the
/sys/devices/system/cpu directory.  We also put the "chip_serial"
and "chip_revision" information from our old /proc/tile/board file
as attributes in /sys/devices/system/cpu.

Other information collected via hypervisor APIs is now placed in
/sys/hypervisor.  We create a /sys/hypervisor/type file (holding the
constant string "tilera") to be parallel with the Xen use of
/sys/hypervisor/type holding "xen".  We create three top-level files,
"version" (the hypervisor's own version), "config_version" (the
version of the configuration file), and "hvconfig" (the contents of
the configuration file).  The remaining information from our old
/proc/tile/board and /proc/tile/switch files becomes an attribute
group appearing under /sys/hypervisor/board/.

Finally, after some feedback from Arnd Bergmann for the previous
version of this patch, the /proc/tile/hardwall file is split up into
two conceptual parts.  First, a directory /proc/tile/hardwall/ which
contains one file per active hardwall, each file named after the
hardwall's ID and holding a cpulist that says which cpus are enclosed by
the hardwall.  Second, a /proc/PID file "hardwall" that is either
empty (for non-hardwall-using processes) or contains the hardwall ID.

Finally, this change pushes the /proc/sys/tile/unaligned_fixup/
directory, with knobs controlling the kernel code for handling the
fixup of unaligned exceptions.
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>
      f133ecca
  3. 26 5月, 2011 2 次提交
  5. 24 5月, 2011 1 次提交
  7. 20 5月, 2011 5 次提交
    • C
      arch/tile: cleanups for tilegx compat mode · 818d8462
      由 Chris Metcalf 提交于 
      These changes make the syscall table line up correctly for
tilegx compat mode, and remove the stale sys32_fadvise64() function,
which isn't actually used by any syscall table.
Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>
      818d8462
    • C
      arch/tile: allocate PCI IRQs later in boot · f4de51de
      由 Chris Metcalf 提交于 
      This change became required due to some recent reworking in the
platform-independent IRQ code.  It is required for 2.6.38 and later.

Cc: stable@kernel.org
Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>
      f4de51de
    • C
      arch/tile: support signal "exception-trace" hook · 571d76ac
      由 Chris Metcalf 提交于 
      This change adds support for /proc/sys/debug/exception-trace to tile.
Like x86 and sparc, by default it is set to "1", generating a one-line
printk whenever a user process crashes.  By setting it to "2", we get
a much more complete userspace diagnostic at crash time, including
a user-space backtrace, register dump, and memory dump around the
address of the crash.

Some vestiges of the Tilera-internal version of this support are
removed with this patch (the show_crashinfo variable and the
arch_coredump_signal function).  We retain a "crashinfo" boot parameter
which allows you to set the boot-time value of exception-trace.
Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>
      571d76ac
    • C
      arch/tile: use better definitions of xchg() and cmpxchg() · 8aaf1dda
      由 Chris Metcalf 提交于 
      These definitions use a ({}) construct to avoid some cases where
we were getting warnings about unused return values.  We also
promote the definition to the common <asm/atomic.h>, since it applies
to both the 32- and 64-bit atomics.

In addition, define __HAVE_ARCH_CMPXCHG for TILE-Gx since it has
efficient direct atomic instructions.
Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>
      8aaf1dda
    • C
      include/linux/compat.h: coding-style fixes · 4800a5bb
      由 Chris Metcalf 提交于 
      I touched this file when adding support for the "tilegx" sub-architecture,
and Andrew Morton observed "The file's a mismash of old-style, wrong-style
and right-style.  There's no point in doing mishmash preservation!
May as well fix things up when we touch them."

Accordingly, this change makes <linux/compat.h> as checkpatch-clean
as possible.  It makes no semantic changes whatsoever.
Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      4800a5bb
  9. 19 5月, 2011 6 次提交
  11. 18 5月, 2011 20 次提交
  13. 17 5月, 2011 5 次提交
    • L
      Merge branch 'timers-fixes-for-linus' of... · a085963a
      由 Linus Torvalds 提交于 
      Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  tick: Clear broadcast active bit when switching to oneshot
  rtc: mc13xxx: Don't call rtc_device_register while holding lock
  rtc: rp5c01: Initialize drvdata before registering device
  rtc: pcap: Initialize drvdata before registering device
  rtc: msm6242: Initialize drvdata before registering device
  rtc: max8998: Initialize drvdata before registering device
  rtc: max8925: Initialize drvdata before registering device
  rtc: m41t80: Initialize clientdata before registering device
  rtc: ds1286: Initialize drvdata before registering device
  rtc: ep93xx: Initialize drvdata before registering device
  rtc: davinci: Initialize drvdata before registering device
  rtc: mxc: Initialize drvdata before registering device
  clocksource: Install completely before selecting
      a085963a
    • B
      x86, AMD: Fix ARAT feature setting again · 14fb57dc
      由 Borislav Petkov 提交于 
      Trying to enable the local APIC timer on early K8 revisions
uncovers a number of other issues with it, in conjunction with
the C1E enter path on AMD. Fixing those causes much more churn
and troubles than the benefit of using that timer brings so
don't enable it on K8 at all, falling back to the original
functionality the kernel had wrt to that.
Reported-and-bisected-by: NNick Bowler <nbowler@elliptictech.com>
Cc: Boris Ostrovsky <Boris.Ostrovsky@amd.com>
Cc: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: Greg Kroah-Hartman <greg@kroah.com>
Cc: Hans Rosenfeld <hans.rosenfeld@amd.com>
Cc: Nick Bowler <nbowler@elliptictech.com>
Cc: Joerg-Volker-Peetz <jvpeetz@web.de>
Signed-off-by: NBorislav Petkov <borislav.petkov@amd.com>
Link: http://lkml.kernel.org/r/1305636919-31165-3-git-send-email-bp@amd64.orgSigned-off-by: NIngo Molnar <mingo@elte.hu>
      14fb57dc
    • B
      Revert "x86, AMD: Fix APIC timer erratum 400 affecting K8 Rev.A-E processors" · 328935e6
      由 Borislav Petkov 提交于 
      This reverts commit e20a2d20, as it crashes
certain boxes with specific AMD CPU models.

Moving the lower endpoint of the Erratum 400 check to accomodate
earlier K8 revisions (A-E) opens a can of worms which is simply
not worth to fix properly by tweaking the errata checking
framework:

* missing IntPenging MSR on revisions < CG cause #GP:

http://marc.info/?l=linux-kernel&m=130541471818831

* makes earlier revisions use the LAPIC timer instead of the C1E
idle routine which switches to HPET, thus not waking up in
deeper C-states:

http://lkml.org/lkml/2011/4/24/20

Therefore, leave the original boundary starting with K8-revF.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      328935e6
    • J
      scsi: remove performance regression due to async queue run · 9937a5e2
      由 Jens Axboe 提交于 
      Commit c21e6beb removed our queue request_fn re-enter
protection, and defaulted to always running the queues from
kblockd to be safe. This was a known potential slow down,
but should be safe.

Unfortunately this is causing big performance regressions for
some, so we need to improve this logic. Looking into the details
of the re-enter, the real issue is on requeue of requests.

Requeue of requests upon seeing a BUSY condition from the device
ends up re-running the queue, causing traces like this:

scsi_request_fn()
        scsi_dispatch_cmd()
                scsi_queue_insert()
                        __scsi_queue_insert()
                                scsi_run_queue()
					scsi_request_fn()
						...

potentially causing the issue we want to avoid. So special
case the requeue re-run of the queue, but improve it to offload
the entire run of local queue and starved queue from a single
workqueue callback. This is a lot better than potentially
kicking off a workqueue run for each device seen.

This also fixes the issue of the local device going into recursion,
since the above mentioned commit never moved that queue run out
of line.
Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
      9937a5e2
    • L
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 · c1d10d18
      由 Linus Torvalds 提交于 
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6:
  net: Change netdev_fix_features messages loglevel
  vmxnet3: Fix inconsistent LRO state after initialization
  sfc: Fix oops in register dump after mapping change
  IPVS: fix netns if reading ip_vs_* procfs entries
  bridge: fix forwarding of IPv6
      c1d10d18