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  1. 01 Jun, 2011 8 commits
    • Mike Habeck's avatar
      intel-iommu: Add domain check in domain_remove_one_dev_info · 8519dc44
      Mike Habeck authored 
      The comment in domain_remove_one_dev_info() states "No need to compare
PCI domain; it has to be the same". But for the si_domain that isn't
going to be true, as it consists of all the PCI devices that are
identity mapped thus multiple PCI domains can be in si_domain.  The
code needs to validate the PCI domain too.
Signed-off-by: default avatarMike Habeck <habeck@sgi.com>
Signed-off-by: default avatarMike Travis <travis@sgi.com>
Cc: stable@kernel.org
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
      8519dc44
    • Mike Travis's avatar
      intel-iommu: Remove Host Bridge devices from identity mapping · 825507d6
      Mike Travis authored 
      When using the 1:1 (identity) PCI DMA remapping, PCI Host Bridge devices
that do not use the IOMMU causes a kernel panic.  Fix that by not
inserting those devices into the si_domain.
Signed-off-by: default avatarMike Travis <travis@sgi.com>
Reviewed-by: default avatarMike Habeck <habeck@sgi.com>
Cc: stable@kernel.org
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
      825507d6
    • Mike Travis's avatar
      intel-iommu: Use coherent DMA mask when requested · c681d0ba
      Mike Travis authored 
      The __intel_map_single function is not honoring the passed in DMA mask.
This results in not using the coherent DMA mask when called from
intel_alloc_coherent().
Signed-off-by: default avatarMike Travis <travis@sgi.com>
Acked-by: default avatarChris Wright <chrisw@sous-sol.org>
Reviewed-by: default avatarMike Habeck <habeck@sgi.com>
Cc: stable@kernel.org
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
      c681d0ba
    • Chris Wright's avatar
      intel-iommu: Dont cache iova above 32bit · 1c9fc3d1
      Chris Wright authored 
      Mike Travis and Mike Habeck reported an issue where iova allocation
would return a range that was larger than a device's dma mask.

https://lkml.org/lkml/2011/3/29/423

The dmar initialization code will reserve all PCI MMIO regions and copy
those reservations into a domain specific iova tree.  It is possible for
one of those regions to be above the dma mask of a device.  It is typical
to allocate iovas with a 32bit mask (despite device's dma mask possibly
being larger) and cache the result until it exhausts the lower 32bit
address space.  Freeing the iova range that is >= the last iova in the
lower 32bit range when there is still an iova above the 32bit range will
corrupt the cached iova by pointing it to a region that is above 32bit.
If that region is also larger than the device's dma mask, a subsequent
allocation will return an unusable iova and cause dma failure.

Simply don't cache an iova that is above the 32bit caching boundary.
Reported-by: default avatarMike Travis <travis@sgi.com>
Reported-by: default avatarMike Habeck <habeck@sgi.com>
Cc: stable@kernel.org
Acked-by: default avatarMike Travis <travis@sgi.com>
Tested-by: default avatarMike Habeck <habeck@sgi.com>
Signed-off-by: default avatarChris Wright <chrisw@sous-sol.org>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
      1c9fc3d1
    • Mike Travis's avatar
      intel-iommu: Speed up processing of the identity_mapping function · cb452a40
      Mike Travis authored 
      When there are a large count of PCI devices, and the pass through
option for iommu is set, much time is spent in the identity_mapping
function hunting though the iommu domains to check if a specific
device is "identity mapped".

Speed up the function by checking the cached info to see if
it's mapped to the static identity domain.
Signed-off-by: default avatarMike Travis <travis@sgi.com>
Reviewed-by: default avatarMike Habeck <habeck@sgi.com>
Cc: stable@kernel.org
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
      cb452a40
    • Chris Wright's avatar
      intel-iommu: Check for identity mapping candidate using system dma mask · 8fcc5372
      Chris Wright authored 
      The identity mapping code appears to make the assumption that if the
devices dma_mask is greater than 32bits the device can use identity
mapping.  But that is not true: take the case where we have a 40bit
device in a 44bit architecture. The device can potentially receive a
physical address that it will truncate and cause incorrect addresses
to be used.

Instead check to see if the device's dma_mask is large enough
to address the system's dma_mask.
Signed-off-by: default avatarMike Travis <travis@sgi.com>
Reviewed-by: default avatarMike Habeck <habeck@sgi.com>
Cc: stable@kernel.org
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
      8fcc5372
    • Alex Williamson's avatar
      intel-iommu: Only unlink device domains from iommu · 9b4554b2
      Alex Williamson authored 
      Commit a97590e5 added unlinking domains from iommus to reciprocate the
iommu from domains unlinking that was already done.  We actually want
to only do this for device domains and never for the static
identity map domain or VM domains.  The SI domain is special and
never freed, while VM domain->id lives in their own special address
space, separate from iommu->domain_ids.

In the current code, a VM can get domain->id zero, then mark that
domain unused when unbound from pci-stub.  This leads to DMAR
write faults when the device is re-bound to the host driver.
Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
Cc: stable@kernel.org
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
      9b4554b2
    • Youquan Song's avatar
      intel-iommu: Enable super page (2MiB, 1GiB, etc.) support · 6dd9a7c7
      Youquan Song authored 
      There are no externally-visible changes with this. In the loop in the
internal __domain_mapping() function, we simply detect if we are mapping:
  - size >= 2MiB, and
  - virtual address aligned to 2MiB, and
  - physical address aligned to 2MiB, and
  - on hardware that supports superpages.

(and likewise for larger superpages).

We automatically use a superpage for such mappings. We never have to
worry about *breaking* superpages, since we trust that we will always
*unmap* the same range that was mapped. So all we need to do is ensure
that dma_pte_clear_range() will also cope with superpages.

Adjust pfn_to_dma_pte() to take a superpage 'level' as an argument, so
it can return a PTE at the appropriate level rather than always
extending the page tables all the way down to level 1. Again, this is
simplified by the fact that we should never encounter existing small
pages when we're creating a mapping; any old mapping that used the same
virtual range will have been entirely removed and its obsolete page
tables freed.

Provide an 'intel_iommu=sp_off' argument on the command line as a
chicken bit. Not that it should ever be required.

==

The original commit seen in the iommu-2.6.git was Youquan's
implementation (and completion) of my own half-baked code which I'd
typed into an email. Followed by half a dozen subsequent 'fixes'.

I've taken the unusual step of rewriting history and collapsing the
original commits in order to keep the main history simpler, and make
life easier for the people who are going to have to backport this to
older kernels. And also so I can give it a more coherent commit comment
which (hopefully) gives a better explanation of what's going on.

The original sequence of commits leading to identical code was:

Youquan Song (3):
      intel-iommu: super page support
      intel-iommu: Fix superpage alignment calculation error
      intel-iommu: Fix superpage level calculation error in dma_pfn_level_pte()

David Woodhouse (4):
      intel-iommu: Precalculate superpage support for dmar_domain
      intel-iommu: Fix hardware_largepage_caps()
      intel-iommu: Fix inappropriate use of superpages in __domain_mapping()
      intel-iommu: Fix phys_pfn in __domain_mapping for sglist pages
Signed-off-by: default avatarYouquan Song <youquan.song@intel.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
      6dd9a7c7
  3. 24 May, 2011 3 commits
  5. 19 May, 2011 1 commit
  7. 18 May, 2011 22 commits
  9. 17 May, 2011 6 commits
    • Jeff Layton's avatar
      cifs: fix cifsConvertToUCS() for the mapchars case · 11379b5e
      Jeff Layton authored 
      As Metze pointed out, commit 84cdf74e broke mapchars option:

    Commit "cifs: fix unaligned accesses in cifsConvertToUCS"
    (84cdf74e) does multiple steps
    in just one commit (moving the function and changing it without
    testing).

    put_unaligned_le16(temp, &target[j]); is never called for any
    codepoint the goes via the 'default' switch statement. As a result
    we put just zero (or maybe uninitialized) bytes into the target
    buffer.

His proposed patch looks correct, but doesn't apply to the current head
of the tree. This patch should also fix it.

Cc: <stable@kernel.org> # .38.x: 581ade4d: cifs: clean up various nits in unicode routines (try #2)
Reported-by: default avatarStefan Metzmacher <metze@samba.org>
Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
      11379b5e
    • Jeff Layton's avatar
      cifs: add fallback in is_path_accessible for old servers · 221d1d79
      Jeff Layton authored 
      The is_path_accessible check uses a QPathInfo call, which isn't
supported by ancient win9x era servers. Fall back to an older
SMBQueryInfo call if it fails with the magic error codes.

Cc: stable@kernel.org
Reported-and-Tested-by: default avatarSandro Bonazzola <sandro.bonazzola@gmail.com>
Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
      221d1d79
    • Linus Torvalds's avatar
      Merge branch 'timers-fixes-for-linus' of... · a085963a
      Linus Torvalds authored 
      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
    • Borislav Petkov's avatar
      x86, AMD: Fix ARAT feature setting again · 14fb57dc
      Borislav Petkov authored 
      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: default avatarNick 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: default avatarBorislav Petkov <borislav.petkov@amd.com>
Link: http://lkml.kernel.org/r/1305636919-31165-3-git-send-email-bp@amd64.orgSigned-off-by: default avatarIngo Molnar <mingo@elte.hu>
      14fb57dc
    • Borislav Petkov's avatar
      Revert "x86, AMD: Fix APIC timer erratum 400 affecting K8 Rev.A-E processors" · 328935e6
      Borislav Petkov authored 
      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: default avatarIngo Molnar <mingo@elte.hu>
      328935e6
    • Jens Axboe's avatar
      scsi: remove performance regression due to async queue run · 9937a5e2
      Jens Axboe authored 
      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: default avatarJens Axboe <jaxboe@fusionio.com>
      9937a5e2
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