While ttm_dma_pool_shrink_scan() tries to take mutex before doing GFP_KERNEL
allocation, ttm_pool_shrink_scan() does not do it. This can result in stack
overflow if kmalloc() in ttm_page_pool_free() triggered recursion due to
memory pressure.

  shrink_slab()
  => ttm_pool_shrink_scan()
     => ttm_page_pool_free()
        => kmalloc(GFP_KERNEL)
           => shrink_slab()
              => ttm_pool_shrink_scan()
                 => ttm_page_pool_free()
                    => kmalloc(GFP_KERNEL)

Change ttm_pool_shrink_scan() to do like ttm_dma_pool_shrink_scan() does.
Signed-off-by: NTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: stable <stable@kernel.org> [2.6.35+]
Signed-off-by: NDave Airlie <airlied@redhat.com>

I can observe that RHEL7 environment stalls with 100% CPU usage when a
certain type of memory pressure is given. While the shrinker functions
are called by shrink_slab() before the OOM killer is triggered, the stall
lasts for many minutes.

One of reasons of this stall is that
ttm_dma_pool_shrink_count()/ttm_dma_pool_shrink_scan() are called and
are blocked at mutex_lock(&_manager->lock). GFP_KERNEL allocation with
_manager->lock held causes someone (including kswapd) to deadlock when
these functions are called due to memory pressure. This patch changes
"mutex_lock();" to "if (!mutex_trylock()) return ...;" in order to
avoid deadlock.
Signed-off-by: NTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: stable <stable@kernel.org> [3.3+]
Signed-off-by: NDave Airlie <airlied@redhat.com>

We can use "unsigned int" instead of "atomic_t" by updating start_pool
variable under _manager->lock. This patch will make it possible to avoid
skipping when choosing a pool to shrink in round-robin style, after next
patch changes mutex_lock(_manager->lock) to !mutex_trylock(_manager->lork).
Signed-off-by: NTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: stable <stable@kernel.org> [3.3+]
Signed-off-by: NDave Airlie <airlied@redhat.com>

list_empty(&_manager->pools) being false before taking _manager->lock
does not guarantee that _manager->npools != 0 after taking _manager->lock
because _manager->npools is updated under _manager->lock.
Signed-off-by: NTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: stable <stable@kernel.org> [3.3+]
Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NDave Airlie <airlied@redhat.com>

Signed-off-by: NDave Airlie <airlied@redhat.com>

Merge branch 'drm_kms_for_next-v8' of git://git.linaro.org/people/benjamin.gaignard/kernel into drm-next

This series of patches add the support of DRM/KMS drivers for STMicroelectronics
chipsets stih416 and stih407.

Hardware is split in two main blocks: Compositor and TVout. Each of them
includes specific hardware IPs and the display timing are controlled by a specific
Video Timing Generator hardware IP (VTG).

Compositor is made of the follow hardware IPs:
 - GDP (Generic Display Pipeline) which is an entry point for graphic (RGB)
   buffers
 - VDP (Video Diplay Pipeline) which is an entry point for video (YUV) buffers
 - HQVDP (High Quality Video Display Processor) that supports scaling,
   deinterlacing and some miscellaneous image quality improvements.
   It fetches the Video decoded buffers from memory, processes them and pushes
   them to the Compositor through a HW dedicated bus.
 - Mixer is responsible of mixing all the entries depending of their
   respective z-order and layout

TVout is divided in 3 parts:
 - HDMI to generate HDMI signals, depending of chipset version HDMI phy can
   change.
 - HDA to generate signals for HD analog TV
 - VIP to control/switch data path coming from Compositor

On stih416 compositor and Tvout are on different dies so a Video Trafic Advance
inter-die Communication mechanism (VTAC) is needed.

+---------------------------------------------+   +----------------------------------------+
| +-------------------------------+   +----+  |   |  +----+   +--------------------------+ |
| |                               |   |    |  |   |  |    |   |  +---------+     +----+  | |
| | +----+              +------+  |   |    |  |   |  |    |   |  | VIP     |---->|HDMI|  | |
| | |GPD +------------->|      |  |   |    |  |   |  |    |   |  |         |     +----+  | |
| | +----+              |Mixer |--|-->|    |  |   |  |    |---|->| switcher|             | |
| |                     |      |  |   |    |  |   |  |    |   |  |         |     +----+  | |
| |                     |      |  |   |    |  |   |  |    |   |  |         |---->|HDA |  | |
| |                     +------+  |   |VTAC|========>|VTAC|   |  +---------+     +----+  | |
| |                               |   |    |  |   |  |    |   |                          | |
| |         Compositor            |   |    |  |   |  |    |   |           TVout          | |
| +-------------------------------+   |    |  |   |  |    |   +--------------------------+ |
|                      ^              |    |  |   |  |    |             ^                  |
|                      |              |    |  |   |  |    |             |                  |
|               +--------------+      |    |  |   |  |    |      +-------------+           |
|               | VTG (master) |----->|    |  |   |  |    |----->| VTG (slave) |           |
|               +--------------+      +----+  |   |  +----+      +-------------+           |
|Digital die                                  |   |                              Analog Die|
+---------------------------------------------+   +----------------------------------------+

On stih407 Compositor and Tvout are on the same die

+-----------------------------------------------------------------+
| +-------------------------------+  +--------------------------+ |
| |                               |  |  +---------+     +----+  | |
| | +----+              +------+  |  |  | VIP     |---->|HDMI|  | |
| | |GPD +------------->|      |  |  |  |         |     +----+  | |
| | +----+              |Mixer |--|--|->| switcher|             | |
| | +----+   +-----+    |      |  |  |  |         |     +----+  | |
| | |VDP +-->+HQVDP+--->|      |  |  |  |         |---->|HDA |  | |
| | +----+   +-----+    +------+  |  |  +---------+     +----+  | |
| |                               |  |                          | |
| |         Compositor            |  |           TVout          | |
| +-------------------------------+  +--------------------------+ |
|                              ^        ^                         |
|                              |        |                         |
|                           +--------------+                      |
|                           |     VTG      |                      |
|                           +--------------+                      |
|Digital die                                                      |
+-----------------------------------------------------------------+

In addition of the drivers for the IPs listed before a thin I2C driver (hdmiddc) is used
by HDMI driver to retrieve EDID for monitor.

To unify interfaces of GDP and VDP we create a "layer" interface called by
compositor to control both GPD and VDP.

Hardware have memory contraints (alignment, contiguous) so we use CMA drm helpers functions
to allocate frame buffer.

File naming convention is:
 - sti_* for IPs drivers
 - sti_drm_* for drm functions implementation.

* 'drm_kms_for_next-v8' of git://git.linaro.org/people/benjamin.gaignard/kernel:
  drm: sti: Add DRM driver itself
  drm: sti: add Compositor
  drm: sti: add Mixer
  drm: sti: add VID layer
  drm: sti: add GDP layer
  drm: sti: add TVOut driver
  drm: sti: add HDA driver
  drm: sti: add HDMI driver
  drm: sti: add VTAC drivers
  drm: sti: add VTG driver
  drm: sti: add bindings for DRM driver

This builds upon the previous set of fixes which were pulled on 6th July.
Included in this set are:
- an update from Jean-Francois to add the missing reg documentation entry
  to the device tree documentation.
- conversion of the tda998x driver to the component helpers.

* 'tda998x-devel' of git://ftp.arm.linux.org.uk/~rmk/linux-cubox:
  drm/i2c: tda998x: add component support
  drm/i2c: tda998x: allow re-use of tda998x support code
  drm/i2c: tda998x: fix lack of required reg in DT documentation

Conflicts:
	drivers/gpu/drm/i2c/tda998x_drv.c

This time around we have a mix of new hw enablement (mdp5 v1.3 /
apq8084), plus devicetree and various upstream changes (mostly
adapting to CCF vs downstream clk driver differences) for mdp4 /
apq8064.  With these drm/msm patches plus a few other small patchsets
(from linaro qcom integration branch.. mostly stuff queued up for
3.17) we have the inforce ifc6410 board working, with gpu.  Much nicer
to work with than ancient vendor android branch :-)

* 'msm-next' of git://people.freedesktop.org/~robclark/linux:
  drm/msm/hdmi: fix HDMI_MUX_EN gpio request typo
  drm/msm/hdmi: enable lpm-mux if it is present
  drm/msm/mdp5: add support for MDP5 v1.3
  drm/msm: fix potential deadlock in gpu init
  drm/msm: use upstream iommu
  drm/msm: no mmu is only error if not using vram carveout
  drm/msm: fix BUG_ON() in error cleanup path
  drm/msm/mdp4: add mdp axi clk
  drm/msm: hdmi phy 8960 phy pll
  drm/msm: update generated headers
  drm/msm: DT support for 8960/8064 (v3)
  drm/msm: Implement msm drm fb_mmap callback function
  drm/msm: activate iommu support
  drm/msm: fix double struct_mutex acquire

Linux 3.16

backmerge requested by i915, nouveau and radeon authors

Conflicts:
	drivers/gpu/drm/i915/i915_gem_render_state.c
	drivers/gpu/drm/i915/intel_drv.h

HDMI_MUX_EN gpio is requested. If an error occurs, the same name
should be printed (HDMI_MUX_EN) instead of HDMI_MUX_SEL (typo).
Signed-off-by: NBeeresh Gopal <gbeeresh@codeaurora.org>
Signed-off-by: NStephane Viau <sviau@codeaurora.org>
Reviewed-by: NAndreas Färber <afaerber@suse.de>
Signed-off-by: NRob Clark <robdclark@gmail.com>

lpm-mux is programmed to enable HDMI connector
on the docking station for S805 chipset based
devices.
Signed-off-by: NBeeresh Gopal <gbeeresh@codeaurora.org>
Signed-off-by: NStephane Viau <sviau@codeaurora.org>
Signed-off-by: NRob Clark <robdclark@gmail.com>

MDP5 has several functional blocks (ie: VIG/RGB pipes, LMs, ...).
From one revision to another, these blocks' base addresses might
change due to the number of instances present in the MDP5 hw.
A way of dealing with these offset changes is to introduce
dynamic offsets 'per block'.

This change adds support for the new revision of MDP5: v1.3.
The idea is to define one hw config per MDP version and select
either one of them at runtime, after reading the MDP5 version.

Once the MDP version is known, 'per block' dynamic offsets
are initialized through a global pointer, which is then used for
read/write register access.
Signed-off-by: NStephane Viau <sviau@codeaurora.org>
Signed-off-by: NRob Clark <robdclark@gmail.com>

Somewhere along the way, the firmware loader sprouted another lock
dependency, resulting in possible deadlock scenario:

 &dev->struct_mutex --> &sb->s_type->i_mutex_key#2 --> &mm->mmap_sem

which is problematic vs things like gem mmap.

So introduce a separate mutex to synchronize gpu init.
Signed-off-by: NRob Clark <robdclark@gmail.com>

Downstream kernel IOMMU had a non-standard way of dealing with multiple
devices and multiple ports/contexts.  We don't need that on upstream
kernel, so rip out the crazy.

Note that we have to move the pinning of the ringbuffer to after the
IOMMU is attached.  No idea how that managed to work properly on the
downstream kernel.

For now, I am leaving the IOMMU port name stuff in place, to simplify
things for folks trying to backport latest drm/msm to device kernels.
Once we no longer have to care about pre-DT kernels, we can drop this
and instead backport upstream IOMMU driver.
Signed-off-by: NRob Clark <robdclark@gmail.com>

Signed-off-by: NRob Clark <robdclark@gmail.com>

Signed-off-by: NRob Clark <robdclark@gmail.com>

Downstream kernel holds this clk via a fake-parent relationship.
Upstream clock framework requires that we hold it explicitly.
Signed-off-by: NRob Clark <robdclark@gmail.com>

On downstream kernel the clk driver directly bangs hdmi phy registers.
For upstream kernel, we need to model this as a clock and register with
the clock framework.
Signed-off-by: NRob Clark <robdclark@gmail.com>

Signed-off-by: NRob Clark <robdclark@gmail.com>

Now that we (almost) have enough dependencies in place (MMCC, RPM, etc),
add necessary DT support so that we can use drm/msm on upstream kernel.

v2: update for review comments
v3: rebase on component helper changes
Signed-off-by: NRob Clark <robdclark@gmail.com>

This change implements msm drm specific fb_mmap function for fb device
to properly map the fb address to userspace.
Signed-off-by: NHai Li <hali@codeaurora.org>
Signed-off-by: NStephane Viau <sviau@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com> (+ minor comment tweak)

This changes activates the iommu support for MDP5, through the
platform config structure.
Signed-off-by: NStephane Viau <sviau@codeaurora.org>
Signed-off-by: NRob Clark <robdclark@gmail.com>

Mutex is already grabbed in show_locked().. somehow this slipped
through.
Signed-off-by: NRob Clark <robdclark@gmail.com>

Merge tag 'drm-intel-next-2014-07-25-merged' of git://anongit.freedesktop.org/drm-intel into drm-next

Final feature pull for 3.17.

drm-intel-next-2014-07-25:
- Ditch UMS support (well just the config option for now)
- Prep work for future platforms (Sonika Jindal, Damien)
- runtime pm/soix fixes (Paulo, Jesse)
- psr tracking improvements, locking fixes, now enabled by default!
- rps fixes for chv (Deepak, Ville)
- drm core patches for rotation support (Ville, Sagar Kamble) - the i915 parts
  unfortunately didn't make it yet
- userptr fixes (Chris)
- minimum backlight brightness (Jani), acked long ago by Matthew Garret on irc -
  I've forgotten about this patch :(

QA is a bit unhappy about the DP MST stuff since it broke hpd testing a
bit, but otherwise looks sane. I've backmerged drm-next to resolve
conflicts with the mst stuff, which means the new tag itself doesn't
contain the overview as usual.

* tag 'drm-intel-next-2014-07-25-merged' of git://anongit.freedesktop.org/drm-intel: (75 commits)
  drm/i915/userptr: Keep spin_lock/unlock in the same block
  drm/i915: Allow overlapping userptr objects
  drm/i915: Ditch UMS config option
  drm/i915: respect the VBT minimum backlight brightness
  drm/i915: extract backlight minimum brightness from VBT
  drm/i915: Replace HAS_PCH_SPLIT which incorrectly lets some platforms in
  drm/i915: Returning from increase/decrease of pllclock when invalid
  drm/i915: Setting legacy palette correctly for different platforms
  drm/i915: Avoid incorrect returning for some platforms
  drm/i915: Writing proper check for reading of pipe status reg
  drm/i915: Returning the right VGA control reg for platforms
  drm/i915: Allowing changing of wm latencies for valid platforms
  drm/i915: Adding HAS_GMCH_DISPLAY macro
  drm/i915: Fix possible overflow when recording semaphore states.
  drm/i915: Do not unmap object unless no other VMAs reference it
  drm/i915: remove plane/cursor/pipe assertions from intel_crtc_disable
  drm/i915: Reorder ctx unref on ppgtt cleanup
  drm/i915/error: Check the potential ctx obj's vm
  drm/i915: Fix printing proper min/min/rpe values in debugfs
  drm/i915: BDW can also detect unclaimed registers
  ...

Daniel pointed out with hotplug that userspace could be trying to oops us
as root for lols, and that to be correct we shouldn't register the object
with the idr before we have fully set the connector object up.

His proposed solution was a lot more life changing, this seemed like a simpler
proposition to me, get the connector object id from the idr, but don't
register the object until the drm_connector_register callback.

The open question is whether the drm_mode_object_register needs a bigger lock
than just the idr one, but I can't see why it would, but I can be locking
challenged.

v2: fix bool noreg into sane - add comment.
Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: NDavid Herrmann <dh.herrmann@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

On HSW+, the digital encoders are shared between HDMI and DP outputs,
with one encoder masquerading as both. The VBT should tell us if we need
to have DP or HDMI support on a particular port, but if we don't have DP
support and we enable the DP hpd pulse handler then we cause an oops.

Don't hook up the DP hpd handling if we don't have a DP port.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=81856
Reported-by: Intel QA Team.
Signed-off-by: Dave Airlie <airlied@redhat.com> # v1
[ickle: Fix the error handling after a malloc failure]
Reviewed-by: NDave Airlie <airlied@redhat.com>
Cc: Paulo Zanoni <przanoni@gmail.com>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Merge branch 'exynos-drm-next' of git://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos into drm-next

   This pull request includes i80 interface support, module auto-loading
   ipp consolidation, and trivail fixups and cleanups.

Summary:
- Add i80 interface support. For this, we added some features to
  Exynos drm framework, which don't affect any other SoC and common
  framework because they are specific to Exynos drm.
- Add module auto-loading support. For this, sub drivers of Exynos drm
  exports their of match tables to userspace. This allows modules to be
  loaded automatically based on devicetree information
- Consolidate ipp driver. This patch just just includes cleanups and
  a littl bit refactoring codes.

If there is any problem, please kindly let me know.

* 'exynos-drm-next' of git://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos: (38 commits)
  drm/exynos: g2d: let exynos_g2d_get_ver_ioctl fail
  drm/exynos: g2d: make ioctls more robust
  drm/exynos: hdmi: add null check for hdmiphy_port
  drm/exynos: control blending of mixer graphic layer 0
  drm/exynos: Add MODULE_DEVICE_TABLE entries for various components
  Subject: Revert "drm/exynos: remove MODULE_DEVICE_TABLE definitions"
  Subject: Revert "drm/exynos: fix module build error"
  drm/exynos/ipp: simplify ipp_find_driver
  drm/exynos/ipp: simplify ipp_create_id
  drm/exynos/ipp: remove redundant messages
  drm/exynos/ipp: simplify ipp_find_obj
  drm/exynos/ipp: remove useless registration checks
  drm/exynos/ipp: simplify memory check function
  drm/exynos/ipp: remove incorrect checks of list_first_entry result
  drm/exynos/ipp: remove temporary variable
  drm/exynos/ipp: correct address type
  drm/exynos/ipp: remove struct exynos_drm_ipp_private
  drm/exynos/ipp: remove unused field from exynos_drm_ipp_private
  drm/exynos/ipp: remove type casting
  drm/exynos: g2d: add exynos4212 as a compatible device.
  ...

Currently the DRM_IOCTL_EXYNOS_G2D_GET_VER ioctl always succeeds, even
if no G2D support is available. Let the ioctl fail when this is the
case, so that userspace can accurately probe for G2D support.

This also fixes the exynos tests in libdrm. There 'g2d_init' doesn't
fail when G2D is absent, leading to a segfault later.
Signed-off-by: NTobias Jakobi <tjakobi@math.uni-bielefeld.de>
Signed-off-by: NINki Dae <inki.dae@samsung.com>

Both exynos_g2d_set_cmdlist_ioctl and exynos_g2d_exec_ioctl don't check
if the G2D was succesfully probe. If that is not the case, then g2d_priv
is just NULL and extracting 'dev' from it in the next step  is going to
produce a kernel oops.

Add proper checks and return ENODEV if the G2D is not available.
Signed-off-by: NTobias Jakobi <tjakobi@math.uni-bielefeld.de>
Signed-off-by: NINki Dae <inki.dae@samsung.com>

The hdmiphy can be apb and hdmiphy_port can be null. So before
accessing hdmiphy_port, it should be checked.
Signed-off-by: NSeung-Woo Kim <sw0312.kim@samsung.com>
Signed-off-by: NInki Dae <inki.dae@samsung.com>

The mixer graphic layer 0 isn't blended as default by commit
0377f4ed(drm/exynos: Don't blend mixer
layer 0). But it needs to be blended with graphic layer 0 if video layer
is enabled by vp because video layer is bottom.
Signed-off-by: NJoonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: NInki Dae <inki.dae@samsung.com>

Add MODULE_DEVICE_TABLE calls for the various OF match tables that
currently don't have one. This allows the module to be
autoloaded based on devicetree information.
Signed-off-by: NSjoerd Simons <sjoerd.simons@collabora.co.uk>
Signed-off-by: NInki Dae <inki.dae@samsung.com>

This reverts commit d0896218 was
original to prevent multiple MODULE_DEVICE_TABLE in one module.
Which, as a side-effect broke autoloading of the module.

Since 21bdd17b it is possible to have
multiple calls to MODULE_DEVICE_TABLE, so the patch can be
reverted to restore support for autoloading
Signed-off-by: NSjoerd Simons <sjoerd.simons@collabora.co.uk>
Signed-off-by: NInki Dae <inki.dae@samsung.com>

Since 21bdd17b it is possible to have
multiple calls to MODULE_DEVICE_TABLE, so the patch can be
reverted to restore support for autoloading

Conflicts:
	drivers/gpu/drm/exynos/exynos_drm_fimd.c
	drivers/gpu/drm/exynos/exynos_drm_g2d.c
Signed-off-by: NSjoerd Simons <sjoerd.simons@collabora.co.uk>
Signed-off-by: NInki Dae <inki.dae@samsung.com>

Pull timer fixes from Thomas Gleixner:
 "Two fixes in the timer area:
   - a long-standing lock inversion due to a printk
   - suspend-related hrtimer corruption in sched_clock"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  timer: Fix lock inversion between hrtimer_bases.lock and scheduler locks
  sched_clock: Avoid corrupting hrtimer tree during suspend

The patch puts repeated code sequence into one function, removes verbose
comments and decreases log verbosity.
Signed-off-by: NAndrzej Hajda <a.hajda@samsung.com>
Signed-off-by: NInki Dae <inki.dae@samsung.com>

There is no gain in passing id by pointer to be filled.
Signed-off-by: NAndrzej Hajda <a.hajda@samsung.com>
Signed-off-by: NInki Dae <inki.dae@samsung.com>

In case of error callback prints already corresponding message.
Signed-off-by: NAndrzej Hajda <a.hajda@samsung.com>
Signed-off-by: NInki Dae <inki.dae@samsung.com>