linux-toradex.git/include, branch v3.12.7

ACPIPHP / radeon / nouveau: Fix VGA switcheroo problem related to hotplug

2014-01-09T20:25:16+00:00

commit f244d8b623dae7a7bc695b0336f67729b95a9736 upstream.

The changes in the ACPI-based PCI hotplug (ACPIPHP) subsystem made
during the 3.12 development cycle uncovered a problem with VGA
switcheroo that on some systems, when the device-specific method
(ATPX in the radeon case, _DSM in the nouveau case) is used to turn
off the discrete graphics, the BIOS generates ACPI hotplug events for
that device and those events cause ACPIPHP to attempt to remove the
device from the system (they are events for a device that was present
previously and is not present any more, so that's what should be done
according to the spec).  Then, the system stops functioning correctly.

Since the hotplug events in question were simply silently ignored
previously, the least intrusive way to address that problem is to
make ACPIPHP ignore them again.  For this purpose, introduce a new
ACPI device flag, no_hotplug, and modify ACPIPHP to ignore hotplug
events for PCI devices whose ACPI companions have that flag set.
Next, make the radeon and nouveau switcheroo detection code set the
no_hotplug flag for the discrete graphics' ACPI companion.

Fixes: bbd34fcdd1b2 (ACPI / hotplug / PCI: Register all devices under the given bridge)
References: https://bugzilla.kernel.org/show_bug.cgi?id=61891
References: https://bugzilla.kernel.org/show_bug.cgi?id=64891
Reported-and-tested-by: Mike Lothian 
Reported-and-tested-by: 
Reported-and-tested-by: Joaquín Aramendía 
Cc: Alex Deucher 
Cc: Dave Airlie 
Cc: Takashi Iwai 
Signed-off-by: Rafael J. Wysocki 
Signed-off-by: Greg Kroah-Hartman

aio/migratepages: make aio migrate pages sane

2014-01-09T20:25:16+00:00

commit 8e321fefb0e60bae4e2a28d20fc4fa30758d27c6 upstream.

The arbitrary restriction on page counts offered by the core
migrate_page_move_mapping() code results in rather suspicious looking
fiddling with page reference counts in the aio_migratepage() operation.
To fix this, make migrate_page_move_mapping() take an extra_count parameter
that allows aio to tell the code about its own reference count on the page
being migrated.

While cleaning up aio_migratepage(), make it validate that the old page
being passed in is actually what aio_migratepage() expects to prevent
misbehaviour in the case of races.

Signed-off-by: Benjamin LaHaise 
Signed-off-by: Greg Kroah-Hartman

mm: numa: guarantee that tlb_flush_pending updates are visible before page table updates

2014-01-09T20:25:14+00:00

commit af2c1401e6f9177483be4fad876d0073669df9df upstream.

According to documentation on barriers, stores issued before a LOCK can
complete after the lock implying that it's possible tlb_flush_pending
can be visible after a page table update.  As per revised documentation,
this patch adds a smp_mb__before_spinlock to guarantee the correct
ordering.

Signed-off-by: Mel Gorman 
Acked-by: Paul E. McKenney 
Reviewed-by: Rik van Riel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

mm: fix TLB flush race between migration, and change_protection_range

2014-01-09T20:25:14+00:00

commit 20841405940e7be0617612d521e206e4b6b325db upstream.

There are a few subtle races, between change_protection_range (used by
mprotect and change_prot_numa) on one side, and NUMA page migration and
compaction on the other side.

The basic race is that there is a time window between when the PTE gets
made non-present (PROT_NONE or NUMA), and the TLB is flushed.

During that time, a CPU may continue writing to the page.

This is fine most of the time, however compaction or the NUMA migration
code may come in, and migrate the page away.

When that happens, the CPU may continue writing, through the cached
translation, to what is no longer the current memory location of the
process.

This only affects x86, which has a somewhat optimistic pte_accessible.
All other architectures appear to be safe, and will either always flush,
or flush whenever there is a valid mapping, even with no permissions
(SPARC).

The basic race looks like this:

CPU A			CPU B			CPU C

						load TLB entry
make entry PTE/PMD_NUMA
			fault on entry
						read/write old page
			start migrating page
			change PTE/PMD to new page
						read/write old page [*]
flush TLB
						reload TLB from new entry
						read/write new page
						lose data

[*] the old page may belong to a new user at this point!

The obvious fix is to flush remote TLB entries, by making sure that
pte_accessible aware of the fact that PROT_NONE and PROT_NUMA memory may
still be accessible if there is a TLB flush pending for the mm.

This should fix both NUMA migration and compaction.

[mgorman@suse.de: fix build]
Signed-off-by: Rik van Riel 
Signed-off-by: Mel Gorman 
Cc: Alex Thorlton 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

mm: numa: avoid unnecessary disruption of NUMA hinting during migration

2014-01-09T20:25:14+00:00

commit de466bd628e8d663fdf3f791bc8db318ee85c714 upstream.

do_huge_pmd_numa_page() handles the case where there is parallel THP
migration.  However, by the time it is checked the NUMA hinting
information has already been disrupted.  This patch adds an earlier
check with some helpers.

Signed-off-by: Mel Gorman 
Reviewed-by: Rik van Riel 
Cc: Alex Thorlton 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

libata: implement ATA_HORKAGE_NO_NCQ_TRIM and apply it to Micro M500 SSDs

2014-01-09T20:25:12+00:00

commit f78dea064c5f7de07de4912a6e5136dbc443d614 upstream.

Certain drives cannot handle queued TRIM commands properly, even
though support is indicated in the IDENTIFY DEVICE buffer.  This patch
allows for disabling the commands for the affected drives and apply it
to the Micron/Crucial M500 SSDs which exhibit incorrect protocol
behavior when issued queued TRIM commands, which could lead to silent
data corruption.

tj: Merged two unnecessarily split patches and made minor edits
    including shortening horkage name.

Signed-off-by: Marc Carino 
Signed-off-by: Tejun Heo 
Link: http://lkml.kernel.org/g/1387246554-7311-1-git-send-email-marc.ceeeee@gmail.com
Signed-off-by: Greg Kroah-Hartman

auxvec.h: account for AT_HWCAP2 in AT_VECTOR_SIZE_BASE

2014-01-09T20:25:12+00:00

commit f60900f2609e893c7f8d0bccc7ada4947dac4cd5 upstream.

Commit 2171364d1a92 ("powerpc: Add HWCAP2 aux entry") introduced a new
AT_ auxv entry type AT_HWCAP2 but failed to update AT_VECTOR_SIZE_BASE
accordingly.

Signed-off-by: Ard Biesheuvel 
Fixes: 2171364d1a92 (powerpc: Add HWCAP2 aux entry)
Acked-by: Michael Neuling 
Cc: Nishanth Aravamudan 
Cc: Benjamin Herrenschmidt 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

drm/radeon: 0x9649 is SUMO2 not SUMO

2014-01-09T20:25:11+00:00

commit d00adcc8ae9e22eca9d8af5f66c59ad9a74c90ec upstream.

Fixes rendering corruption due to incorrect
gfx configuration.

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=63599

Signed-off-by: Alex Deucher 
Signed-off-by: Greg Kroah-Hartman

drm/radeon: expose render backend mask to the userspace

2014-01-09T20:25:11+00:00

commit 439a1cfffe2c1a06e5a6394ccd5d18a8e89b15d3 upstream.

This will allow userspace to correctly program the PA_SC_RASTER_CONFIG
register, so it can be considered a fix.

Signed-off-by: Marek Olšák 
Signed-off-by: Alex Deucher 
Signed-off-by: Greg Kroah-Hartman

target/file: Update hw_max_sectors based on current block_size

2014-01-09T20:25:09+00:00

commit 95cadace8f3959282e76ebf8b382bd0930807d2c upstream.

This patch allows FILEIO to update hw_max_sectors based on the current
max_bytes_per_io.  This is required because vfs_[writev,readv]() can accept
a maximum of 2048 iovecs per call, so the enforced hw_max_sectors really
needs to be calculated based on block_size.

This addresses a >= v3.5 bug where block_size=512 was rejecting > 1M
sized I/O requests, because FD_MAX_SECTORS was hardcoded to 2048 for
the block_size=4096 case.

(v2: Use max_bytes_per_io instead of ->update_hw_max_sectors)

Reported-by: Henrik Goldman 
Signed-off-by: Nicholas Bellinger 
Signed-off-by: Greg Kroah-Hartman