Chris Wilson [Fri, 24 Jun 2016 13:55:54 +0000 (14:55 +0100)]
drm/i915: Treat kernel context as initialised
The kernel context exists simply as a placeholder and should never be
executed with a render context. It does not need the golden render
state, as that will always be applied to a user context. By skipping the
initialisation we can avoid issues in attempting to program the golden
render context when trying to make the hardware idle.
Chris Wilson [Fri, 24 Jun 2016 13:55:53 +0000 (14:55 +0100)]
drm/i915: Move legacy kernel context pinning to intel_ringbuffer.c
This is so that we have symmetry with intel_lrc.c and avoid a source of
if (i915.enable_execlists) layering violation within i915_gem_context.c -
that is we move the specific handling of the dev_priv->kernel_context
for legacy submission into the legacy submission code.
This depends upon the init/fini ordering between contexts and engines
already defined by intel_lrc.c, and also exporting the context alignment
required for pinning the legacy context.
v2: Separate out pin/unpin context funcs for greater symmetry with
intel_lrc. One more step towards unifying behaviour between the two
classes of engines and towards fixing another bug in i915_switch_context
vs requests.
Chris Wilson [Fri, 24 Jun 2016 13:55:52 +0000 (14:55 +0100)]
drm/i915: Skip idling an idle engine
During suspend (or module unload), if we have never accessed the engine
(i.e. userspace never submitted a batch to it), the engine is idle. Then
we attempt to idle the engine by forcing it to the default context,
which actually means we submit a render batch to setup the golden
context state and then wait for it to complete. We can skip this
entirely as we know the engine is idle.
Chris Wilson [Fri, 24 Jun 2016 13:00:27 +0000 (14:00 +0100)]
drm/i915: Move module init/exit to i915_pci.c
The module init/exit routines are a wrapper around the PCI device
init/exit, so move them across.
Note that in order to avoid exporting the driver struct, instead of
manipulating driver.features inside i915_init we instead opt to simply
exit if i915.modeset is disabled.
Chris Wilson [Fri, 24 Jun 2016 13:00:23 +0000 (14:00 +0100)]
drm/i915: Remove user controllable DRM_ERROR for i915_getparam()
The GETPARAM ioctl writes to a user supplied address. If that address is
invalid, it is the user's error and not the driver's, so quietly report
EFAULT and don't blame ourselves with a DRM_ERROR.
Chris Wilson [Fri, 24 Jun 2016 13:00:22 +0000 (14:00 +0100)]
drm/i915: Merge i915_dma.c into i915_drv.c
i915_dma.c used to contain the DRI1/UMS horror show, but now all that
remains are the out-of-place driver level interfaces (such as
allocating, initialising and registering the driver). These should be in
i915_drv.c alongside similar routines for suspend/resume.
drm_connector_register_all() is now automatically called by
drm_dev_register(), and so we no longer have to do so ourselves (via
intel_modeset_register() after calling drm_dev_register()). Similarly
for unregistering.
Chris Wilson [Fri, 24 Jun 2016 13:00:19 +0000 (14:00 +0100)]
drm/i915: Demidlayer driver unloading
To complete the transition to manual control of load/unload, we need to
take over unloading from i915_pci_remove(). This allows us to correctly
order our unregister vs shutdown phases, which currently are inverted
due to the midlayer.
However, the unload sequence is still invalid as we shutdown the driver
with the last reference. Ideally, all we want to do is remove the
userspace access on device removal, deferring the cleanup to the
drm_dev_release() - breaking the reference cycles is then left as an
exercise for the reader.
Chris Wilson [Fri, 24 Jun 2016 13:00:18 +0000 (14:00 +0100)]
drm/i915: Demidlayer driver loading
Take control over allocating, loading and registering the driver from the
DRM midlayer by performing it manually from i915_pci_probe. This allows
us to carefully control the order of when we setup the hardware vs when
it becomes visible to third parties (including userspace). The current
ordering makes the driver visible to userspace first (in order to
coordinate with removed DRI1 userspace), but that ordering incurs risk.
The risk increases as we strive for more asynchronous loading.
One side effect of controlling the allocation is that we can allocate
both the drm_device + drm_i915_private in one block, the next step
towards subclassing.
Unload is still left as before, a mix of midlayer and driver.
v2: After drm_dev_init(), we should call drm_dev_unref() so that we call
drm_dev_release() and free everything from drm_dev_init().
v3: Fixup missed error code for failing to allocate dev_priv
Chris Wilson [Fri, 24 Jun 2016 13:00:17 +0000 (14:00 +0100)]
drm/i915: Register debugfs interface last
Currently debugfs files are created before the driver is even loads.
This gives the opportunity for userspace to open that interface and poke
around before the backing data structures are initialised - with the
possibility of oopsing or worse.
Move the creation of the debugfs files to our registration phase, where
we announce our presence to the world when we are ready, i.e the
sequence changes from
Chris Wilson [Fri, 24 Jun 2016 13:00:16 +0000 (14:00 +0100)]
drm/i915: Move connector registration to driver registration
Defer connector registration from during construction to the driver
registration phase. This is important for ordering the action correctly,
e.g. not using debugfs before it is ready.
Chris Wilson [Fri, 24 Jun 2016 13:00:15 +0000 (14:00 +0100)]
drm/i915: Move backlight registration to connector registration
Currently the backlight is being registered in the load phase (before
the display and its objects are registered). Move the backlight
registration into the analogous phase by performing it from the
connector registration, just after its creation.
Chris Wilson [Fri, 24 Jun 2016 13:00:14 +0000 (14:00 +0100)]
drm/i915: Move registration actions to connector->late_register
With the introduction of a connector->func for callback from
drm_connector_register() we can move all the tasks that we want to do
upon registration into that callback. Later, this will allow us to
reorder the registration and defer it until after the device is setup
and ready for userspace.
Chris Wilson [Fri, 24 Jun 2016 13:00:13 +0000 (14:00 +0100)]
drm/i915: Move panel's backlight setup next to panel init
Currently setting up the backlight for a panel is sometimes done
together with initialising the panel, and sometimes after the connector
is registered. The backlight setup does not depend upon connector
registration (i.e. access to sysfs/debugfs and the kobject hierachy) so
perform it consistently just after panel initialisation.
Note the discrepancy here as destroying the panel is done during
connector unregistration...
Tvrtko Ursulin [Thu, 23 Jun 2016 13:52:41 +0000 (14:52 +0100)]
drm/i915: Small compaction of the engine init code
Effectively removes one layer of indirection between the mask of
possible engines and the engine constructors. Instead of spelling
out in code the mapping of HAS_<engine> to constructors, makes
more use of the recently added data driven approach by putting
engine constructor vfuncs into the table as well.
Effect is fewer lines of source and smaller binary.
At the same time simplify the error handling since engine
destructors can run on unitialized engines anyway.
Similar approach could be done for legacy submission is wanted.
v2: Removed ugly BUILD_BUG_ONs in favour of newly introduced
ENGINE_MASK and HAS_ENGINE macros.
Also removed the forward declarations by shuffling functions
around.
v3: Warn when logical_rings table does not contain enough data
and disable the engines which could not be initialized.
(Chris Wilson)
v4: Chris Wilson suggested a nicer engine init loop.
Dave Airlie [Fri, 24 Jun 2016 03:16:07 +0000 (13:16 +1000)]
Merge tag 'mediatek-drm-2016-06-20' of git://git.pengutronix.de/git/pza/linux into drm-next
MT8173 HDMI support
- device tree binding documentation for MT8173 HDMI encoder, CEC, DDC,
and PHY
- drivers for MT8173 HDMI encoder, CEC (HPD only for now), DDC, and PHY
- enable HDMI output via a custom SMCCC call
- add ddc-i2c-bus property to HDMI connector device tree binding
* tag 'mediatek-drm-2016-06-20' of git://git.pengutronix.de/git/pza/linux:
dt-bindings: hdmi-connector: add DDC I2C bus phandle documentation
drm/mediatek: enable hdmi output control bit
drm/mediatek: Add HDMI support
dt-bindings: drm/mediatek: Add Mediatek HDMI dts binding
Dave Airlie [Fri, 24 Jun 2016 03:15:10 +0000 (13:15 +1000)]
Merge branch 'drm/next/du' of git://linuxtv.org/pinchartl/media into drm-next
some rcar-du fixes.
* 'drm/next/du' of git://linuxtv.org/pinchartl/media:
drm: rcar-du: error message is not needed for EPROBE_DEFER
drm: rcar-du: error message is not needed for drm_vblank_init()
rcar-du: add/rename DEFR6 TCON bits
Dave Airlie [Fri, 24 Jun 2016 03:13:41 +0000 (13:13 +1000)]
Merge tag 'drm-intel-next-2016-06-20' of git://anongit.freedesktop.org/drm-intel into drm-next
- Infrastructure for GVT-g (paravirtualized gpu on gen8+), from Zhi Wang
- another attemp at nonblocking atomic plane updates
- bugfixes and refactoring for GuC doorbell code (Dave Gordon)
- GuC command submission enabled by default, if fw available (Dave Gordon)
- more bxt w/a (Arun Siluvery)
- bxt phy improvements (Imre Deak)
- prep work for stolen objects support (Ankitprasa Sharma & Chris Wilson)
- skl/bkl w/a update from Mika Kuoppala
- bunch of small improvements and fixes all over, as usual
* tag 'drm-intel-next-2016-06-20' of git://anongit.freedesktop.org/drm-intel: (81 commits)
drm/i915: Update DRIVER_DATE to 20160620
drm/i915: Introduce GVT context creation API
drm/i915: Support LRC context single submission
drm/i915: Introduce execlist context status change notification
drm/i915: Make addressing mode bits in context descriptor configurable
drm/i915: Make ring buffer size of a LRC context configurable
drm/i915: gvt: Introduce the basic architecture of GVT-g
drm/i915: Fold vGPU active check into inner functions
drm/i915: Use offsetof() to calculate the offset of members in PVINFO page
drm/i915: Factor out i915_pvinfo.h
drm/i915: Serialise presentation with imported dmabufs
drm/i915: Use atomic commits for legacy page_flips
drm/i915: Move fb_bits updating later in atomic_commit
drm/i915: nonblocking commit
Reapply "drm/i915: Pass atomic states to fbc update, functions."
drm/i915: Roll out the helper nonblock tracking
drm/i915: Signal drm events for atomic
drm/i915/ilk: Don't disable SSC source if it's in use
drm/i915/guc: (re)initialise doorbell h/w when enabling GuC submission
drm/i915/guc: replace assign_doorbell() with select_doorbell_register()
...
Dave Airlie [Fri, 24 Jun 2016 01:01:17 +0000 (11:01 +1000)]
Merge tag 'topic/drm-misc-2016-06-22-updated' of git://anongit.freedesktop.org/drm-intel into drm-next
Again a pile of things all over
- Conversion to rst from docbook from Jani. Looks real pretty, and the
source is now actually readable (compared to horrible, horrible docbook
xml)! https://01.org/linuxgraphics/gfx-docs/drm/
- device register/unregister rework from Chris, with follow-up work from
Benjamin. Allows more drivers to demidlayer load/unload and others to
remove a bit of boilerplate.
- master/auth related cleanup, with docs
- some dma-buf polish, merged by Sumit
- small stuff all over (like build fixes from Arnd)
Group maintainership seems to slowly take off, with both Thierry and Sumit
pushing a few things. No hiccups thus far.
* tag 'topic/drm-misc-2016-06-22-updated' of git://anongit.freedesktop.org/drm-intel: (68 commits)
drm/vc4: Remove unused connector
drm/fb-helper: Reduce READ_ONCE(master) to lockless_dereference
drm/sun4i: Remove open-coded drm_connector_register_all()
drm/vc4: Remove open-coded drm_connector_register_all()
drm/atmel-hlcdc: Remove redundant call to drm_connector_unregister_all()
drm: document drm_auth.c
drm: Clear up master tracking booleans
drm: Extract drm_is_current_master
drm: Refactor drop/set master code a bit
drm: Lobotomize set_busid nonsense for !pci drivers
drm: Nuke SET_UNIQUE ioctl
drm: Don't call drm_dev_set_unique from platform drivers
drm/vgem: Stop calling drm_drv_set_unique
drm: Use dev->name as fallback for dev->unique
drm: Clean up drm_crtc.h
drm: Move master pointer from drm_minor to drm_device
drm: sti: rework init sequence
drm: sti: use late_register and early_unregister callbacks
drm/amdkfd: Clean up inline handling
drm: Add callbacks for late registering
...
Ville Syrjälä [Fri, 13 May 2016 17:53:56 +0000 (20:53 +0300)]
drm/i915: Refresh cached DP port register value on resume
During hibernation the cached DP port register value will be left with
whatever value we have there when we create the hibernation image.
Currently that means the port (and eDP PLL) will be off in the cached
value. However when we resume there is no guarantee that the value
in the actual register will match the cached value. If i915 isn't
loaded in the kernel that loads the hibernation image, the port may
well be on (eg. left on by the BIOS). The encoder state readout
does the right thing in this case and updates our encoder state
to reflect the actual hardware state. However the post-resume modeset
will then use the stale cached port register value in
intel_dp_link_down() and potentially confuse the hardware.
This was caught by the following assert
WARNING: CPU: 3 PID: 5288 at ../drivers/gpu/drm/i915/intel_dp.c:2184 assert_edp_pll+0x99/0xa0 [i915]
eDP PLL state assertion failure (expected on, current off)
on account of the eDP PLL getting prematurely turned off when
shutting down the port, since the DP_PLL_ENABLE bit wasn't set
in the cached register value.
Presumably I introduced this problem in
commit 6fec76628333 ("drm/i915: Use intel_dp->DP in eDP PLL setup")
as before that we didn't update the cached value after shuttting the
port down. That's assuming the port got enabled at least once prior
to hibernating. If that didn't happen then the cached value would
still have been totally out of sync with reality (eg. first boot w/o
eDP on, then hibernate, and then resume with eDP on).
So, let's fix this properly and refresh the cached register value from
the hardware register during resume.
DDI platforms shouldn't use the cached value during port disable at
least, so shouldn't have this particular issue. They might still have
issues if we skip the initial modeset and then try to retrain the link
or something. But untangling this DP vs. DDI mess is a bigger topic,
so let's jut punt on DDI for now.
Imre Deak [Thu, 16 Jun 2016 17:01:46 +0000 (20:01 +0300)]
drm/i915: Sanity check PPS HW state
The wait for panel status helper will only function correctly if the
HW panel timings are programmed correctly. Returning prematurely from
this helper may lead to obscure bugs later, so sanity check the HW
timing registers.
v2:
- Check the T8, T9 fields too, we do program them (Ville)
Imre Deak [Thu, 16 Jun 2016 13:37:20 +0000 (16:37 +0300)]
drm/i915/bxt: Fix PPS lost state after suspend breaking eDP link training
The PPS registers are backed by power well #0 and as such may be reset
after system or runtime suspend (both implying a possible DC9
transition). Fix this by reusing the VLV/CHV PPS pipe-reassignment
logic. The difference on BXT is that the PPS instances are not pipe but
port (or more accurately pin) specific, so we only need to care about
the lost HW state. As opposed to VLV/CHV the SW state is fixed and
initialized during connector init.
This also paves the way towards using the actual port->PPS instance
mapping based on VBT.
This fixes eDP link training errors on BXT after suspend, where we
started the link training too early due to an incorrect T3 (panel power
on) register value.
Imre Deak [Tue, 21 Jun 2016 08:51:49 +0000 (11:51 +0300)]
drm/i915: Group all the PPS init steps to one place
Move the early PPS initialization calls next to the rest of PPS
initialization steps. This allows us to forgo a duplicated call to
intel_dp_init_panel_power_sequencer_registers() on VLV/CHV.
This will swap the order of DP AUX registration wrt. PPS initialization.
There is an existing race here in case of a user space access via the
DPAUX device node after DP AUX registration and before calling
intel_dp_init_panel_power_sequencer_registers(), but this change won't
make this worse. The fix for this is to separate DP AUX initialization
and registration, that's a separate work already underway.
The order of MST wrt. PPS init as well as the order of
intel_dp_init_panel_power_sequencer_registers() wrt.
intel_edp_panel_vdd_sanitize() also swap, which is ok, there are no
dependencies between these steps.
Imre Deak [Tue, 21 Jun 2016 08:51:48 +0000 (11:51 +0300)]
drm/i915: Initialize the PPS HW before its first use
The initial DPCD read for eDP detection involves using the PPS, but so
far we only initialized the PPS registers after the DPCD read. The
reason this was done so far is to preserve a possible LVDS PPS HW setup
if LVDS is detected but eDP is not. This is not an issue any more after
the previous patch, so we can move the init earlier now.
This was caught by CI with the PPS sanity checks in place and the
initial eDP DPCD readout waiting for the panel power cycle timeout
without the PPS registers being initialized.
Imre Deak [Tue, 21 Jun 2016 08:51:47 +0000 (11:51 +0300)]
drm/i915/ibx, cpt: Don't attempt to register eDP if LVDS was detected
Atm on IBX/CPT we attempt to detect if eDP is present even if LVDS was
already detected and an encoder for it was registered. This involves
trying to read out the eDP DPCD, which in turn needs the same power
sequencer that LVDS uses. Poking at the VDD line at an unexpected time
may or may not interfere with the LVDS panel, but it's probably safer to
prevent this. Registering both an LVDS and an eDP connector would also
present a similar problem accessing the shared PPS at any point later in
an unexpected way.
We also need this to be able fix PPS initialization before its first use
in the next patch. For that we want to be sure that PPS is not in use
by LVDS.
v2:
- Split out the PPS init fix to a separate patch. (Chris)
- Add comment about eDP init depending on LVDS init. (Chris)
- Make the use of the intel_encoder ptr less error prone.
v3:
- Use IBX/CPT reference instead of the incorrect ILK, add a WARN about
this. (Ville)
v4:
- Use a helper to get the lvds encoder instead of opencoding the same.
(Ville)
Daniel Vetter [Wed, 22 Jun 2016 09:31:22 +0000 (11:31 +0200)]
drm/vc4: Remove unused connector
Somehow I didn't spot this when pushing :(
Fixes: 398e97994f6d ("drm/vc4: Remove open-coded drm_connector_register_all()") Acked-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Chris Wilson [Wed, 22 Jun 2016 07:46:12 +0000 (08:46 +0100)]
drm/fb-helper: Reduce READ_ONCE(master) to lockless_dereference
We are only documenting that the read is outside of the lock, and do not
require strict ordering on the operation. In this case the more relaxed
lockless_dereference() will suffice.
drm_dev_register() will now register all known connectors, so we no
longer have to do so manually.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Cc: David Airlie <airlied@linux.ie> Cc: Chen-Yu Tsai <wens@csie.org> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: dri-devel@lists.freedesktop.org Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1466501283-19976-4-git-send-email-chris@chris-wilson.co.uk
Daniel Vetter [Tue, 21 Jun 2016 08:54:22 +0000 (10:54 +0200)]
drm: document drm_auth.c
Also extract drm_auth.h for nicer grouping.
v2: Nuke the other comments since they don't really explain a lot, and
within the drm core we generally only document functions exported to
drivers: The main audience for these docs are driver writers.
v3: Limit the exposure of drm_master internals by only including
drm_auth.h where it is neede (Chris).
v4: Spelling polish (Emil).
Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Daniel Vetter [Tue, 21 Jun 2016 08:54:21 +0000 (10:54 +0200)]
drm: Clear up master tracking booleans
- is_master can be removed, we can compute this by checking allowed_master
(which really just tracks whether a master struct has been allocated
for this fpriv in either open or set_master), and whether the fpriv is
the current master on the device.
- that frees up is_master as a good replacement name for allowed_master.
With that it's clear that it tracks whether the fpriv is a master (with
possibly clients attached to it and authenticated against it), and that
one of those fprivs with is_master set is the current master.
Daniel Vetter [Tue, 21 Jun 2016 08:54:20 +0000 (10:54 +0200)]
drm: Extract drm_is_current_master
Just rolling out a bit of abstraction to be able to clean
up the master logic in the next step.
Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Daniel Vetter [Tue, 21 Jun 2016 12:20:38 +0000 (14:20 +0200)]
drm: Refactor drop/set master code a bit
File open/set_maseter ioctl and file close/drop_master ioctl share the
same master handling code. Extract it.
Note that vmwgfx's master_set callback needs to know whether the
master is a new one or has been used already, so thread this through.
On the close/drop side a similar parameter existed, but wasnt used.
Drop it to simplify the flow.
v2: Try to make it not leak so much (Emil).
v3: Send out the right version ...
Cc: Emil Velikov <emil.l.velikov@gmail.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1466511638-9885-1-git-send-email-daniel.vetter@ffwll.ch
Daniel Vetter [Tue, 21 Jun 2016 12:08:33 +0000 (14:08 +0200)]
drm: Lobotomize set_busid nonsense for !pci drivers
We already have a fallback in place to fill out the unique from
dev->unique, which is set to something reasonable in drm_dev_alloc.
Which means we only need to have a special set_busid for pci devices,
to be able to care the backwards compat code for drm 1.1 around, which
libdrm still needs.
While developing and testing this patch things blew up in really
interesting ways, and the code is rather confusing in naming things
between the kernel code, ioctl #defines and libdrm. For the next brave
dragon slayer, document all this madness properly in the userspace
interface section of gpu.tmpl.
v2: Make drm_dev_set_unique static and update kerneldoc.
v3: Entire rewrite, plus document what's going on for posterity in the
gpu docbook uapi section.
v4: Drop accidental amdgpu hunk (Emil).
v5: Drop accidental omapdrm vblank counter change (Emil).
v6: Rebase on top of the sphinx conversion.
Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk> Cc: Emil Velikov <emil.l.velikov@gmail.com> Tested-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk> (virt_gpu) Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
the X server supports drm 1.1, thus doesn't call call libdrm's
drmSetBusid - the sole user of this ioctl. When reviewing this note
that for hilarity both the kernel-internal functions (set_busid) and
the libdrm wrapper (drmSetBusid) have names not matching this ioctl
(SET_UNIQUE).
drm: use dev_name as default unique name in drm_dev_alloc()
we're using a reasonable default which should work for everyone. Only
mtk, rcar-du and sun4i are affected, and as kms-only drivers without
any rendering support no one should ever care about the unique name
v2: Rebase on top of mediatek.
Cc: Philipp Zabel <p.zabel@pengutronix.de> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Emil Velikov <emil.l.velikov@gmail.com> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1466499262-18717-5-git-send-email-daniel.vetter@ffwll.ch
Daniel Vetter [Tue, 21 Jun 2016 08:54:14 +0000 (10:54 +0200)]
drm: Use dev->name as fallback for dev->unique
Lots of arm drivers get this wrong and for most arm boards this is the
right thing actually. And anyway with most loaders you want to chase
sysfs links anyway to figure out which dri device you want.
This will fix dmesg noise for rockchip and sti.
Also add a fallback to driver->name for entirely virtual drivers like
vgem.
Daniel Vetter [Tue, 21 Jun 2016 08:54:13 +0000 (10:54 +0200)]
drm: Clean up drm_crtc.h
- Group declarations for separate files (drm_bridge.c, drm_edid.c)
- Move declarations only used within drm.ko to drm_crtc_internal.h
- drm_property_type_valid to drm_crtc.c, its only callsite
drm: Protect the master management with a drm_device::master_mutex v3
but I honestly don't care one bit about those old legacy drivers
using this.
- debugfs name info should just grab master_mutex.
- And the fbdev helper looked at it to figure out whether someone is
using KMS. We just need a consistent value, so READ_ONCE. Aside: We
should probably check if anyone has opened a control node too, but I
guess current userspace doesn't really do that yet.
drm: sti: use late_register and early_unregister callbacks
Make sti driver use register callback to move debugfs
initialization out of sub-components creation.
This will allow to convert driver .load() to
drm_dev_alloc() and drm_dev_register().
sti_compositor bring up 2 crtc but only one debugfs init is
needed so use drm_crtc_index to do it on the first one.
This can't be done in sti_drv because only sti_compositor have
access to the devices.
It is almost the same for sti_encoder which handle multiple
encoder while one only debugfs entry is needed so add a boolean
to avoid multiple debugfs initialization
Daniel Vetter [Tue, 21 Jun 2016 09:10:26 +0000 (11:10 +0200)]
drm/amdkfd: Clean up inline handling
- inline functions need to be static inline, otherwise gcc can opt to
not inline and the linker gets unhappy.
- no forward decls for inline functions, just include the right headers.
Like what has been done for connectors add callbacks on encoder,
crtc and plane to let driver do actions after drm device registration.
Correspondingly, add callbacks called before unregister drm device.
version 2:
add drm_modeset_register_all() and drm_modeset_unregister_all()
to centralize all calls
version 3:
in error case unwind registers in drm_modeset_register_all
fix uninitialed return value
inverse order of unregistration in drm_modeset_unregister_all
version 4:
move function definitions in drm_crtc_internal.h
remove not needed documentation
Tvrtko Ursulin [Tue, 21 Jun 2016 14:07:14 +0000 (15:07 +0100)]
drm/i915/guc: Remove one unnecessary variable
No need for local struct drm_device * since dev_priv is the
correct thing to pass in to NEEDS_WaRsDisableCoarsePowerGating
anyway. Changed the macro definition for the latter to reflect
that as well.
Stefan Agner [Sun, 19 Jun 2016 02:15:43 +0000 (19:15 -0700)]
drm/fsl-dcu: use drm_mode_config_cleanup on initialization errors
Commit 7566e247672d ("drm/fsl-dcu: handle initialization errors properly")
introduced error handling during initialization, but with a wrong cleanup
order.
Replace the error handling with the generic cleanup function
drm_mode_config_cleanup.
Arnd Bergmann [Wed, 11 May 2016 20:11:07 +0000 (22:11 +0200)]
drm/mediatek: Remove IOMMU_DMA select
We get a harmless build warning when trying to use the mediatek DRM
driver with IOMMU support disabled:
warning: (DRM_MEDIATEK) selects IOMMU_DMA which has unmet direct dependencies (IOMMU_SUPPORT)
However, the IOMMU_DMA symbol is not meant to be used by drivers at all,
and this driver doesn't seem to have a strict dependency on it other
than using the mediatek IOMMU driver that does.
Since we also want to be able to do compile tests with the driver on
other platforms, the IOMMU_DMA symbol should not be selected here.
Jani Nikula [Tue, 21 Jun 2016 11:49:03 +0000 (14:49 +0300)]
Documentation/DocBook: remove gpu.tmpl
The gpu documentation has now been converted to reStructuredText files
under Documentation/gpu. Remove the obsolete DocBook template. Also
remove it from MAINTAINERS.
Jani Nikula [Tue, 21 Jun 2016 11:49:01 +0000 (14:49 +0300)]
Documentation/gpu: convert the KMS properties table to CSV
Pandoc really did a bad job of converting the big KMS properties table
to RST. Instead, put the properties into a separate plain text CSV file,
and include it in the RST file. The generated output isn't very pretty,
but at least the information is there, and it's stored in a format
that's easier to process and improve upon at a later time.
The CSV file was generated by copy-pasting the table from the HTML
generated by the DocBook toolchain into LibreOffice Calc, and then saved
as CSV, unmodified.
Jani Nikula [Tue, 21 Jun 2016 11:49:00 +0000 (14:49 +0300)]
Documentation/gpu: use recommended order of heading markers
While splitting the document up, the headings "shifted" from what pandoc
generated. Use the following order for headings for consistency:
==============
Document title
==============
First
=====
Second
------
Third
~~~~~
Leave the lower level headings as they are; I think those are less
important. Although RST doesn't mandate a specific order ("Rather than
imposing a fixed number and order of section title adornment styles, the
order enforced will be the order as encountered."), having the higher
levels the same overall makes it easier to follow the documents.
[I'm sort of kind of writing the recommendation for docs-next in the
mean time, but this order seems sensible, and is what I'm proposing.]
Jani Nikula [Tue, 21 Jun 2016 11:48:57 +0000 (14:48 +0300)]
Documentation/gpu: add new gpu.rst converted from DocBook gpu.tmpl
This is the first step towards converting the DocBook gpu.tmpl to Sphinx
and reStructuredText, the new kernel documentation tool and markup.
Use Jon's "cheesy conversion script" in Documentation/sphinx/tmplcvt to
do the rough conversion. Do the manual edits in follow-up patches. Add a
new Documentation/gpu directories for the graphics related
documentation. (Hooray, now we can have directories based on topics
rather than tools under Documentation.)
We also won't remove the DocBook gpu.tmpl yet so it's easier to build
both and compare the results for parity.
drm/i915: Use connector_type for printing in intel_connector_info, v2.
Instead of looking at encoder->type, which may be set to UNKNOWN,
use connector->connector_type. Info cannot be printed for MST
connectors which may have a NULL encoder, return early in that case.
Changes since v1:
- Whitelist encoder types for HDMI and LVDS.
- Fix oops on MST.
- Do not list encoder types for eDP/DP, they're always valid.
Michał Winiarski [Mon, 20 Jun 2016 09:58:27 +0000 (11:58 +0200)]
drm/i915: Set softmin frequency on idle->busy transition
If the GPU load is low enough, it's possible that we'll be stuck at idle
frequency rather than transition into softmin frequency requested by
userspace.
v2: Use intel_set_rps, drop vlv_set_idle
v3: Back to vlv_set_idle, clamp to valid range
v4: Place intel_set_rps at the end
References: https://bugs.freedesktop.org/show_bug.cgi?id=89728 Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Imre Deak <imre.deak@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Michał Winiarski <michal.winiarski@intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/1466416707-12075-1-git-send-email-michal.winiarski@intel.com
Dave Gordon [Mon, 20 Jun 2016 14:18:07 +0000 (15:18 +0100)]
drm/i915/guc: index host arrays by i915 engine ID, not guc_id
The ONLY places that guc_id (aka hw_id) should be used are those where
the value or address is determined by and shared with the GuC firmware;
specifically, when filling in the GuC-context-descriptor or the GuC
addon data, or putting an entry in the GuC's work queue.
It need not (and therefore should not) be used to index GuC statistics
or similar host-managed tracking data. In particular, i915_guc_submit()
produces (and debugfs decodes) GuC submission statistics which should be
indexed by driver-engine-id rather then guc-engine-id.
Daniel Vetter [Wed, 8 Jun 2016 12:19:18 +0000 (14:19 +0200)]
drm/crtc-helper: disable_unused_functions really isn't for atomic
Rockchip just blew up here on testing, because I removed some "is this
crtc already disabled/enabled" state tracking from callbacks (not needed
with atomic). Turns out that was needed to work around rockchip still
calling legacy helper code.
Since me explaining on irc/mailing-list plus kerneldoc isn't enough,
be more verbose and add dmesg output. Not that anyone actually reads that,
either.
Chris Wilson [Fri, 17 Jun 2016 08:25:23 +0000 (09:25 +0100)]
drm/rcar-du: Remove redundant calls to drm_connector_register_all()
Up to now, the recommendation was for drivers to call drm_dev_register()
followed by drm_connector_register_all(). Now that
drm_connector_register() is safe against multiple invocations, we can
move drm_connector_register_all() to drm_dev_register() and not suffer
from any backwards compatibility issues with drivers not following the
more rigorous init ordering.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: David Airlie <airlied@linux.ie> Cc: dri-devel@lists.freedesktop.org Cc: linux-renesas-soc@vger.kernel.org Tested-by: Archit Taneja <architt@codeaurora.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1466151923-1572-8-git-send-email-chris@chris-wilson.co.uk
Chris Wilson [Fri, 17 Jun 2016 08:25:22 +0000 (09:25 +0100)]
drm/msm: Remove redundant calls to drm_connector_register_all()
Up to now, the recommendation was for drivers to call drm_dev_register()
followed by drm_connector_register_all(). Now that
drm_connector_register() is safe against multiple invocations, we can
move drm_connector_register_all() to drm_dev_register() and not suffer
from any backwards compatibility issues with drivers not following the
more rigorous init ordering.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Rob Clark <robdclark@gmail.com> Cc: David Airlie <airlied@linux.ie> Cc: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org Cc: freedreno@lists.freedesktop.org Tested-by: Archit Taneja <architt@codeaurora.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1466151923-1572-7-git-send-email-chris@chris-wilson.co.uk
Chris Wilson [Fri, 17 Jun 2016 08:25:21 +0000 (09:25 +0100)]
drm/mediatek: Remove redundant calls to drm_connector_register_all()
Up to now, the recommendation was for drivers to call drm_dev_register()
followed by drm_connector_register_all(). Now that
drm_connector_register() is safe against multiple invocations, we can
move drm_connector_register_all() to drm_dev_register() and not suffer
from any backwards compatibility issues with drivers not following the
more rigorous init ordering.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Matthias Brugger <matthias.bgg@gmail.com> Cc: David Airlie <airlied@linux.ie> Cc: dri-devel@lists.freedesktop.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-mediatek@lists.infradead.org Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1466151923-1572-6-git-send-email-chris@chris-wilson.co.uk
Chris Wilson [Fri, 17 Jun 2016 08:25:20 +0000 (09:25 +0100)]
drm/hisilicon: Remove redundant calls to drm_connector_register_all()
Up to now, the recommendation was for drivers to call drm_dev_register()
followed by drm_connector_register_all(). Now that
drm_connector_register() is safe against multiple invocations, we can
move drm_connector_register_all() to drm_dev_register() and not suffer
from any backwards compatibility issues with drivers not following the
more rigorous init ordering.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Xinliang Liu <z.liuxinliang@hisilicon.com> Cc: Xinwei Kong <kong.kongxinwei@hisilicon.com> Cc: Chen Feng <puck.chen@hisilicon.com> Cc: David Airlie <airlied@linux.ie> Cc: dri-devel@lists.freedesktop.org Acked-by: Xinliang Liu <z.liuxinliang@hisilicon.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1466151923-1572-5-git-send-email-chris@chris-wilson.co.uk
Chris Wilson [Fri, 17 Jun 2016 08:25:19 +0000 (09:25 +0100)]
drm/atmel-hlcdc: Remove redundant calls to drm_connector_register_all()
Up to now, the recommendation was for drivers to call drm_dev_register()
followed by drm_connector_register_all(). Now that
drm_connector_register() is safe against multiple invocations, we can
move drm_connector_register_all() to drm_dev_register() and not suffer
from any backwards compatibility issues with drivers not following the
more rigorous init ordering.
Chris Wilson [Fri, 17 Jun 2016 08:25:18 +0000 (09:25 +0100)]
drm/arc: Remove redundant calls to drm_connector_register_all()
Up to now, the recommendation was for drivers to call drm_dev_register()
followed by drm_connector_register_all(). Now that
drm_connector_register() is safe against multiple invocations, we can
move drm_connector_register_all() to drm_dev_register() and not suffer
from any backwards compatibility issues with drivers not following the
more rigorous init ordering.
Tomasz Figa [Tue, 21 Jun 2016 04:27:34 +0000 (13:27 +0900)]
drm/rockchip: Finish initialization before registering DRM device
Currently the driver calls drm_dev_register() directly after allocating
the DRM device and then continues with further initialization. This is
incorrect, because drm_dev_register() is supposed to be called after all
initialization is done. This problem was masked by the fact that
drm_dev_register() did not use to do anything special before, but
recently it started to call drm_connector_register_all(), which leads to
a crash if the driver is not fully initialized.
This patch fixes the problem by moving the call to drm_dev_register() to
the end of the initialization sequence and also removing the, now
unnecessary, call to drm_connector_register_all() from driver code.
Chris Wilson [Tue, 21 Jun 2016 08:16:55 +0000 (09:16 +0100)]
drm/i915/fbdev: Flush mode configuration before lastclose
During lastclose, we call intel_fbdev_restore_mode() to switch back to
the fbcon configuration on return to VT. However, if we have not yet
finished the asynchronous fbdev initialisation, the current mode will be
invalid and trigger WARNs upon application.
Serialise with the outstanding initialisation if the first application
exits quickly. Note that to hit this in practice requires using an
unregistered async_domain as otherwise modprobe will force a full
synchronisation prior to init() completing.
v2: Reuse comment explaining the +1 by refactoring the wait on fbdev
sync in the previous patch.
Reported-by: Gustav Fägerlind <gustav.fagerlind@gmail.com> Reported-by: "Li, Weinan Z" <weinan.z.li@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93580 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1466497015-8509-3-git-send-email-chris@chris-wilson.co.uk
Chris Wilson [Tue, 21 Jun 2016 08:16:54 +0000 (09:16 +0100)]
drm/i915/fbdev: Limit the global async-domain synchronization
During cleanup we have to synchronise with the async task we are using
to initialise and register our fbdev. Currently, we are using a full
synchronisation on the global domain, but we can restrict this to just
synchronising up to our task if we remember our cookie.
Whilst there, streamline the function parameters.
v2: async_synchronize_cookie() takes an exclusive upper bound, to
synchronize with our task we have to pass in the next cookie.
v3: Drop premature disregarding of the active cookie (we need to wait
until the task is complete before continuing in the teardown).
v4: Refactor waiting on async to incorporate a comment explaining why we
need the +1.
Chris Wilson [Tue, 21 Jun 2016 08:16:53 +0000 (09:16 +0100)]
drm/i915/fbdev: Perform async fbdev initialisation much later
Setting up fbdev requires everything ready and registered (in particular
the connectors). In the forthcoming patches, we defer registration of the KMS
objects and unless we defer setting off fbdev, it may run before they are
registered and oops.
Chris Wilson [Fri, 17 Jun 2016 17:46:39 +0000 (14:46 -0300)]
drm/i915: use ORIGIN_CPU for frontbuffer invalidation on WC mmaps
... instead of the previous ORIGIN_GTT. This should actually
invalidate FBC once something is written on the frontbuffer using WC
mmaps. The problem with ORIGIN_GTT is that the automatic hardware
tracking is not able to detect the WC writes as it can detect the GTT
writes.
This should help fix the SKL bug where nothing happens when you type
your username/password on lightdm.
This patch was originally pasted on an email by Chris and converted to
an actual git patch by Paulo.
v2 (from Paulo):
- Make it a full variable instead of a bit-field (Daniel)
- Use WRITE_ONCE (Chris)
v3 (from Paulo):
- Remove huge comment since now we have WRITE_ONCE (Chris)
- Remove uneeded new line (Chris)
- Add Chris' Signed-off-by, authorized via IRC
Paulo Zanoni [Wed, 13 Apr 2016 19:01:09 +0000 (16:01 -0300)]
drm/i915/fbc: sanitize i915.enable_fbc during FBC init
The DDX driver changes its behavior depending on the value it reads
from i915.enable_fbc, so sanitize the value in order to allow it to
know what's going on. It uses this in order to choose the defaults for
the TearFree option. Before this patch, it would read -1 and always
assume that FBC was disabled, so it wouldn't force TearFree.
Paulo Zanoni [Mon, 4 Apr 2016 21:17:15 +0000 (18:17 -0300)]
drm/i915/fbc: update busy_bits even for GTT and flip flushes
We ignore ORIGIN_GTT because the hardware tracking can recognize GTT
writes and take care of them. We also ignore ORIGIN_FLIP because we
deal with flips without relying on the frontbuffer tracking
infrastructure. On the other hand, a flush is a flush and means we're
good to go, so we need to update busy_bits in order to reflect that,
even if we're not going to do anything else about it.
How to reproduce the bug fixed by this patch:
- boot SKL up to the desktop environment
- stop the display manager
- run any of the igt/kms_frontbuffer_tracking/*fbc*onoff* subtests
- the tests will fail
The steps above will create the right conditions for us to lose track
of busy_bits. If you, for example, run the full set of FBC tests, the
onoff subtests will succeed.
Also notice that the "bug" is that we'll just keep FBC disabled on
cases where it could be enabled, so it's not something the users can
perceive, it just affects power consumption numbers on properly
configured machines.
This was kind of a difficult bug to track down. If you're using a
Haswell system running GNOME and you have fbc completely enabled and
working, playing videos can result in video artifacts. Steps to
reproduce:
- Run GNOME
- Ensure FBC is enabled and active
- Download a movie, I used the ogg version of Big Buck Bunny for this
- Run `gst-launch-1.0 filesrc location='some_movie.ogg' ! decodebin !
glimagesink` in a terminal
- Watch for about over a minute, you'll see small horizontal lines go
down the screen.
For the time being, disable FBC for Haswell by default.
Stefan Richter reported kernel freezes (no video artifacts) when fbc
is on. (E3-1245 v3 with HD P4600; openbox and some KDE and LXDE
applications, thread begins at https://lkml.org/lkml/2016/4/26/813).
We also got reports from Steven Honeyman on openbox+roxterm.
v2 (From Paulo):
- Add extra information to the commit message
- Add Fixes tag
- Rebase
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96461
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96464 Fixes: a98ee79317b4 ("drm/i915/fbc: enable FBC by default on HSW and BDW") Cc: stable@vger.kernel.org Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: Lyude <cpaul@redhat.com> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1465487895-7401-1-git-send-email-cpaul@redhat.com
Daniel Vetter [Fri, 17 Jun 2016 07:33:23 +0000 (09:33 +0200)]
drm: Mark set/drop master ioctl as unlocked.
Again this is neatly protected by the dev->master_mutex now. There is
a driver callback both for set and drop, but it's only used by vmwgfx.
And vmwgfx has it's own solid locking for shared resources (besides
dev->master_mutex), hence is all safe. Let's drop another place where
the drm legacy bkl is used.
Daniel Vetter [Fri, 17 Jun 2016 07:33:22 +0000 (09:33 +0200)]
drm: Mark authmagic ioctls as unlocked
All protected by dev->master_mutex. And there's no driver callbacks,
which means no need to sync with old dri1 horror show drivers at all.
Hence safe to drop the drm legacy BKL from these paths.
Daniel Vetter [Fri, 17 Jun 2016 07:33:21 +0000 (09:33 +0200)]
drm: Protect authmagic with master_mutex
Simplifies cleanup, and there's no reason drivers should ever care
about authmagic at all - it's all handled in the core.
And with that, Ladies and Gentlemen, it's time to pop the champagen
and celebrate: dev->struct_mutex is now officially gone from modern
drivers, and if a driver is using gem_free_object_unlocked and doesn't
do anything else silly it's positively impossible to ever touch
dev->struct_mutex at runtime, anywhere.
Daniel Vetter [Fri, 17 Jun 2016 07:33:20 +0000 (09:33 +0200)]
drm: Move authmagic cleanup into drm_master_release
It's related, and soon authmagic will also use the master_mutex.
There is an ever-so-slightly semantic change here:
- authmagic will only be cleaned up for primary_client drm_minors. But
it's impossible to create authmagic on render/control nodes, so this
is fine.
- The cleanup is moved down a bit in the release processing. Doesn't
matter at all since authmagic is purely internal logic used by the
core ioctl access checks, and when we're in a file's release
callback no one can do ioctls any more.
Sergei Shtylyov [Fri, 22 Apr 2016 22:56:07 +0000 (01:56 +0300)]
rcar-du: add/rename DEFR6 TCON bits
The TCNE2 bit of the DEFR6 register was renamed to TCNE1 in the R-Car gen2
manuals -- which makes more sense as that bit controls whether DU1, not DU2
is connected to TCON.
While at it, add the TCNE0 bit which controls whether DU0 is connected to
TCON.
Based on the large patch by Andrey Gusakov <andrey.gusakov@cogentembedded.com>.
Chris Wilson [Mon, 20 Jun 2016 18:53:33 +0000 (19:53 +0100)]
drm: Prevent NULL deref in drm_name_info()
If a driver does not have a parent, or never sets the unique name for
itself, then we may proceed to chase a NULL dereference through
debugfs/.../name.
Matthew Auld [Mon, 20 Jun 2016 16:42:46 +0000 (17:42 +0100)]
drm: fix send_vblank_event use-after-free error
The drm_pending_event can be freed by drm_send_event_locked, as a
result we should call trace_drm_vblank_event_delivered before this
to avoid hitting a user-after-free error when accessing the pid member:
[ 378.438497] BUG: KASAN: use-after-free in send_vblank_event+0xf0/0x310 [drm] at addr ffff8801ac7e50a0
[ 378.438500] Read of size 4 by task Xorg/1562
[ 378.438501] =============================================================================
[ 378.438504] BUG kmalloc-128 (Tainted: G B ): kasan: bad access detected
[ 378.438506] -----------------------------------------------------------------------------
Mathias Krause [Sun, 19 Jun 2016 12:31:31 +0000 (14:31 +0200)]
dma-buf: remove dma_buf_debugfs_create_file()
There is only a single user of dma_buf_debugfs_create_file() and that
one got the function pointer cast wrong. With that one fixed, there is
no need to have a wrapper for debugfs_create_file(), just call it
directly.
With no users left, we can remove dma_buf_debugfs_create_file().
While at it, simplify the error handling in dma_buf_init_debugfs()
slightly.
Mathias Krause [Sun, 19 Jun 2016 12:31:30 +0000 (14:31 +0200)]
dma-buf: remove dma_buf directory on bufinfo file creation errors
Change the error handling in dma_buf_init_debugfs() to remove the
"dma_buf" directory if creating the "bufinfo" file fails. No need to
have an empty debugfs directory around.
Mathias Krause [Sun, 19 Jun 2016 12:31:29 +0000 (14:31 +0200)]
dma-buf: propagate errors from dma_buf_describe() on debugfs read
The callback function dma_buf_describe() returns an int not void so the
function pointer cast in dma_buf_show() is wrong. dma_buf_describe() can
also fail when acquiring the mutex gets interrupted so always returning
0 in dma_buf_show() is wrong, too.
Fix both issues by avoiding the indirection via dma_buf_show() and call
dma_buf_describe() directly. Rename it to dma_buf_debug_show() to get it
in line with the other functions.
This type mismatch was caught by the PaX RAP plugin.
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