So the problem with async commit (especially async modeset commit) is
that the legacy pointers only get updated after the point of no
return, in the async part of the modeset sequence. At least as
implemented by the current helper functions. This is done in the
set_routing_links function in drm_atomic_helper.c.
Which also means that access isn't protected by locks but only
coordinated by synchronizing with async workers. No problem thus far,
until we lock at the getconnector/encoder ioctls.
So fix this up by adding special cases for atomic drivers: For those
we need to look at state objects. Unfortunately digging out the
correct encoder->crtc link is a bit of work, so wrap this up in a
helper function.
Moving the assignments of connector->encoder and encoder->crtc earlier
isn't a good idea because the point of the atomic helpers is that we
stage the state updates. That way the disable functions can still
inspect the links and rely upon them.
v2: Extract full encoder->crtc lookup into helper (Rob).
v3: Extract drm_connector_get_encoder too since - we need to always
return state->best_encoder when there is a state otherwise we might
return stale data if there's a pending async disable (and chase
unlocked pointers, too). Same issue with encoder_get_crtc but there
it's a bit more tricky to handle.
Cc: Rob Clark <robdclark@gmail.com>
Cc: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Lightly-Tested-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
The current state of CRTCs, planes and connectors currently leaks during
DRM driver ->unload() unless drivers explicitly clean it up. Since there
is nothing driver-specific about it, that cleanup can be done within the
DRM core.
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
I guess for hysterical raisins this was meant to be the way to read
blob properties. But that's done with the two-stage approach which
uses separate blob kms object and the special-purpose get_blob ioctl.
Shipping userspace seems to have never relied on this, and the kernel
also never put any blob thing onto that property. And nowadays it
would blow up, e.g. in drm_property_destroy. Also it makes no sense to
return values in an ioctl that only returns metadata about everything.
So let's ditch all the internal code for the blob list, rename the
list to be unambiguous and sprinkle comments all over the place to
explain this peculiar piece of api.
v2: Squash in fixup from Rob to remove now unused variables.
Cc: Rob Clark <robdclark@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
- Make it clear that it's a negative errno (more in line with
everything else).
- Clean up the confusion around get_properties vs. getproperty ioctls:
One reads per-obj property values, the other reads property
metadata.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
I've totally forgotten that with DP MST connectors can now be
hotplugged. And failed to adapt Rob's drm_atomic_state code (which
predates connector hotplugging) to the new realities.
The first step is to make sure that the connector indices used to
access the arrays of pointers are stable. The connection mutex gives
us enough guarantees for that, which means we won't unecessarily block
on concurrent modesets or background probing.
So add a locking WARN_ON and shuffle the code slightly to make sure we
always hold the right lock.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Some drivers erroneously treat the .pitch and .size fields of struct
drm_mode_create_dumb as inputs. While the include/uapi/drm/drm_mode.h
header has a comment denoting them as outputs, that seemingly wasn't
enough to make drivers use them properly.
The result is that some userspace doesn't explicitly zero out those
fields, assuming that the kernel won't use them. That causes problems
since the data within the structure might be uninitialized, so bogus
data may end up confusing drivers (ridiculously large values for the
pitch, ...).
This series attempts to improve the situation by fixing all drivers to
not use the output fields. Furthermore to spare new drivers this bad
surprise, the DRM core now zeros out these fields prior to handing the
data structure to the driver.
Lessons learned from this are that future IOCTLs should be properly
documented (in the DRM DocBook for example) and should be rigorously
defined. To prevent misuse like this, userspace should be required to
zero out all output fields. The kernel should check for this and fail
if that's not the case.
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Merge tag 'drm/gem-cma/for-3.19-rc1' of git://people.freedesktop.org/~tagr/linux into drm-next
drm: Sanitize DRM_IOCTL_MODE_CREATE_DUMB input
Some drivers erroneously treat the .pitch and .size fields of struct
drm_mode_create_dumb as inputs. While the include/uapi/drm/drm_mode.h
header has a comment denoting them as outputs, that seemingly wasn't
enough to make drivers use them properly.
The result is that some userspace doesn't explicitly zero out those
fields, assuming that the kernel won't use them. That causes problems
since the data within the structure might be uninitialized, so bogus
data may end up confusing drivers (ridiculously large values for the
pitch, ...).
This series attempts to improve the situation by fixing all drivers to
not use the output fields. Furthermore to spare new drivers this bad
surprise, the DRM core now zeros out these fields prior to handing the
data structure to the driver.
Lessons learned from this are that future IOCTLs should be properly
documented (in the DRM DocBook for example) and should be rigorously
defined. To prevent misuse like this, userspace should be required to
zero out all output fields. The kernel should check for this and fail
if that's not the case.
* tag 'drm/gem-cma/for-3.19-rc1' of git://people.freedesktop.org/~tagr/linux:
drm/cma: Remove call to drm_gem_free_mmap_offset()
drm: Sanitize DRM_IOCTL_MODE_CREATE_DUMB input
drm/rcar: gem: dumb: pitch is an output
drm/omap: gem: dumb: pitch is an output
drm/cma: Introduce drm_gem_cma_dumb_create_internal()
drm/doc: Add GEM/CMA helpers to kerneldoc
drm/doc: mm: Fix indentation
drm/gem: Fix a few kerneldoc typos
Virtual GPUs would like to give the guest some indication where on the screen
the outputs are layed out. So far we only provide modes, these
properties could be exposed to userspace so the desktop environment
could use them as hints to set the correct offsets.
v2: rename properties to be more consistent.
Signed-off-by: Dave Airlie <airlied@redhat.com>
While looking through drm_crtc.c to double-check make locking changes
I've noticed that there's a few other places that would now benefit
from simplified return value handling.
So let's flatten the control flow and replace and always 0 ret with 0
where possible.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This is a small collection of fixes that I've been carrying around for a
while now. Many of these have been posted and reviewed or acked. The few
that haven't I deemed too trivial to bother.
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Merge tag 'drm/fixes/for-3.19-rc1' of git://people.freedesktop.org/~tagr/linux into drm-next
drm: Miscellaneous fixes for v3.19-rc1
This is a small collection of fixes that I've been carrying around for a
while now. Many of these have been posted and reviewed or acked. The few
that haven't I deemed too trivial to bother.
* tag 'drm/fixes/for-3.19-rc1' of git://people.freedesktop.org/~tagr/linux:
video/hdmi: Relicense header under MIT license
drm/gma500: mdfld: Reuse video/mipi_display.h
drm: Make drm_mode_create_tv_properties() signature consistent
drm: Implement drm_get_pci_dev() dummy for !PCI
drm/prime: Use unsigned type for number of pages
drm/gem: Fix typo in kerneldoc
drm: Use const data when creating blob properties
drm: Use size_t for blob property sizes
Some drivers treat the pitch and size fields as inputs and will use them
as minima provided by userspace so that they are only overwritten if the
minimal requirements of the driver exceed them.
This can cause strange behaviour when applications don't zero out these
fields, causing whatever was on the stack to be passed to the IOCTL. In
a typical case this would become visible as a failed allocation if the
pitch or size were unusually high. But this could also cause more subtle
bugs like overallocating dumb framebuffers.
To prevent drivers from misusing these values, make the DRM core zero
out the pitch and size fields before passing the structure to the driver
implementation.
While at it, also set the output handle field to zero for good measure,
even though it's less likely to be abused.
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Thierry Reding <treding@nvidia.com>
The prototype and the function implementation differ in their signature.
Make them consistent and use an unsigned integer for the number of modes
while at it.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Creating a blob property will always copy the input data so the data
that is passed in can be const.
Signed-off-by: Thierry Reding <treding@nvidia.com>
size_t is the standard type when dealing with sizes of all kinds. Use it
consistently when instantiating DRM blob properties.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Motivated by the per-plane locking I've gone through all the get*
ioctls and reduced the locking to the bare minimum required.
v2: Rebase and make it compile ...
v3: Review from Sean:
- Simplify return handling in getplane_res.
- Add a comment to getplane_res that the plane list is invariant and
can be walked locklessly.
v4: Actually git add.
Cc: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Turned out to be much simpler on top of my latest atomic stuff than
what I've feared. Some details:
- Drop the modeset_lock_all snakeoil in drm_plane_init. Same
justification as for the equivalent change in drm_crtc_init done in
commit d0fa1af40e
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Mon Sep 8 09:02:49 2014 +0200
drm: Drop modeset locking from crtc init function
Without these the drm_modeset_lock_init would fall over the exact
same way.
- Since the atomic core code wraps the locking switching it to
per-plane locks was a one-line change.
- For the legacy ioctls add a plane argument to the locking helper so
that we can grab the right plane lock (cursor or primary). Since the
universal cursor plane might not be there, or someone really crazy
might forgoe the primary plane even accept NULL.
- Add some locking WARN_ON to the atomic helpers for good paranoid
measure and to check that it all works out.
Tested on my exynos atomic hackfest with full lockdep checks and ww
backoff injection.
v2: I've forgotten about the load-detect code in i915.
v3: Thierry reported that in latest 3.18-rc vmwgfx doesn't compile any
more due to
commit 21e88620aa
Author: Rob Clark <robdclark@gmail.com>
Date: Thu Oct 30 13:39:04 2014 -0400
drm/vmwgfx: fix lock breakage
Rebased and fix this up.
Cc: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
These two didn't get documented properly, do so.
Pointed out by Daniel.
v1.1: add missing boilerplate (Daniel)
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This patch fix following error while "make xmldocs"
Warning(.//drivers/gpu/drm/drm_crtc.c:778): Excess function parameter
'mode' description in 'drm_connector_get_cmdline_mode'
Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Make drm_mode_add_fb() call drm_mode_add_fb2() after converting its
args to the new internal format, instead of duplicating code.
Also picks up a lot more error checking, which the legacy modes
should pass after being converted to the new format.
Signed-off-by: Chuck Ebbert <cebbert.lkml@gmail.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Fix:
ioclt -> ioctl in comment
wrong variable name in debug message
Signed-off-by: Chuck Ebbert <cebbert.lkml@gmail.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
[danvet: Frob manually generated patch to make it apply.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This patch fix spelling typos found in drm.xml.
It is because the file is generated from comments in
source codes, I have to fix the typos within source files.
Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Paulo Zanoni reported a lockdep splat with a locking inversion between
fpriv->fbs_lock and the modeset locks. This issue was introduced in
commit f2b50c1161
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Fri Sep 12 17:07:32 2014 +0200
drm: Fixup locking for universal cursor planes
This here is actually one of the rare cases where lockdep hits a false
positive: The deadlock only happens in drm_fb_release, which cleans up
the file private structure when all the references are gone. So the
locking is the very last one and no one else can deadlock. It also
doesn't protect anything at all, since all ioctls are guaranteed to
have returned at this point - otherwise they'd still hold a reference
on the file.
So let's just drop it and replace it with a big comment.
Cc: David Herrmann <dh.herrmann@gmail.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Paulo Zanoni <przanoni@gmail.com>
Reported-and-Tested-by: Paulo Zanoni <przanoni@gmail.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Bunch of things amiss:
- Updating crtc->cursor_x/y was done without any locking. Spotted by
David Herrmann.
- Dereferencing crtc->cursor->fb was using the wrong lock, should take
the crtc lock.
- Grabbing _all_ modeset locks torpedoes the reason why we added
fine-grained locks originally: Cursor updates shouldn't stall on
background stuff like probing outputs.
Best is to just grab the crtc lock around everything and drop all the
other locking. The only issue is that we can't switch planes between
crtcs with that, so make sure that never happens when someone uses
universal plane helpers. This shouldn't be a possible regression ever
since legacy ioctls also only grabbed the crtc lock, so switching
crtcs was never possible for the underlying plane object. And i915
(the only user of universal cursors thus far) has fixed cursor->crtc
links.
Cc: David Herrmann <dh.herrmann@gmail.com>
Cc: Pallavi G<pallavi.g@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Tested-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
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drm: backmerge tag 'v3.17-rc5' into drm-next
This is requested to get the fixes for intel and radeon into the
same tree for future development work.
i915_display.c: fix missing dev_priv conflict.
Here's the updated topic/core-stuff pull request with the two patches
already merged into drm-fixes dropped.
* tag 'topic/core-stuff-2014-09-15' of git://anongit.freedesktop.org/drm-intel:
drm: Drop modeset locking from crtc init function
drm/i915/hdmi: Enable pipe pixel replication for SD interlaced modes
drm/edid: Reduce horizontal timings for pixel replicated modes
drm: Include task->name and master status in debugfs clients info
drm/gem: Fix kerneldoc typo
drm: use c99 initializers in structures
drm: fix drm_modeset_lock.h kernel-doc notation
At driver init no one can access modeset objects and we're
single-threaded. So locking is just cargo-culting here. Worse, with
the new ww mutexes and ww mutex slowpath debugging the mutex_lock
might actually fail, and we don't have the full-blown ww recovery
dance.
Which then leads to fireworks when we try to unlock the not-locked
crtc lock.
An audit of all the functions called from here shows that none of them
contain locking checks, so there's also no reason to keep the locking
around just for consistency of caller contexts. Besides that I have
the rule (at least in i915) that such places where we take locks just
to simplify locking checks and not for correctness always require a
comment.
This regression was introduced in
commit 51fd371bba
Author: Rob Clark <robdclark@gmail.com>
Date: Tue Nov 19 12:10:12 2013 -0500
drm: convert crtc and connection_mutex to ww_mutex (v5)
v2: Don't drop the lock_init call, spotted by the 0day builder.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=83341
Cc: Rob Clark <robdclark@gmail.com>
Cc: thellstrom@vmware.com
Cc: maarten.lankhorst@canonical.com
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
This way drivers can't grow crazy ideas any more, and it also
helps a bit in reviewing EXPORT_SYMBOLS.
v2: Even more stuff. Unfortunately we can't move drm_vm_open_locked
because exynos does some horrible stuff with it.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drm-intel-next-2014-08-22:
- basic code for execlist, which is the fancy new cmd submission on gen8. Still
disabled by default (Ben, Oscar Mateo, Thomas Daniel et al)
- remove the useless usage of console_lock for I915_FBDEV=n (Chris)
- clean up relations between ctx and ppgtt
- clean up ppgtt lifetime handling (Michel Thierry)
- various cursor code improvements from Ville
- execbuffer code cleanups and secure batch fixes (Chris)
- prep work for dev -> dev_priv transition (Chris)
- some of the prep patches for the seqno -> request object transition (Chris)
- various small improvements all over
* tag 'drm-intel-next-2014-09-01' of git://anongit.freedesktop.org/drm-intel: (86 commits)
drm/i915: fix suspend/resume for GENs w/o runtime PM support
drm/i915: Update DRIVER_DATE to 20140822
drm: fix plane rotation when restoring fbdev configuration
drm/i915/bdw: Disable execlists by default
drm/i915/bdw: Enable Logical Ring Contexts (hence, Execlists)
drm/i915/bdw: Document Logical Rings, LR contexts and Execlists
drm/i915/bdw: Print context state in debugfs
drm/i915/bdw: Display context backing obj & ringbuffer info in debugfs
drm/i915/bdw: Display execlists info in debugfs
drm/i915/bdw: Disable semaphores for Execlists
drm/i915/bdw: Make sure gpu reset still works with Execlists
drm/i915/bdw: Don't write PDP in the legacy way when using LRCs
drm/i915: Track cursor changes as frontbuffer tracking flushes
drm/i915/bdw: Help out the ctx switch interrupt handler
drm/i915/bdw: Avoid non-lite-restore preemptions
drm/i915/bdw: Handle context switch events
drm/i915/bdw: Two-stage execlist submit process
drm/i915/bdw: Write the tail pointer, LRC style
drm/i915/bdw: Implement context switching (somewhat)
drm/i915/bdw: Emission of requests with logical rings
...
Conflicts:
drivers/gpu/drm/i915/i915_drv.c
Kinda unexpected, but DIV_ROUND_UP() can overflow if passed an argument
bigger than UINT_MAX - DIVISOR. Fix this by testing for "!cpp" before
using it in the following division.
Note that DIV_ROUND_UP() is defined as:
#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
..this will obviously overflow if (n + d - 1) is bigger than UINT_MAX.
Reported-by: Tommi Rantala <tt.rantala@gmail.com>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Make sure plane rotation is reset correctly when restoring the fbdev
configuration by using drm_mode_plane_set_obj_prop which calls the
driver's set_property callback.
The rotation reset feature was introduced in commit 9783de2 (drm:
Resetting rotation property) and the callback issue was originally
addressed in a previous version of the patch, but the fix was not
present in the final version.
v2: Fix documentation warning
Add some more details to the commit message (Daniel Vetter)
Testcase: igt/kms_rotation_crc
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=82236
Cc: Sonika Jindal <sonika.jindal@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Dave Airlie <airlied@gmail.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Thomas Wood <thomas.wood@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Bunch of small leftovers spotted by looking at the make htmldocs output.
I've left out dp mst, there's too much amiss there.
v2: Also add the missing parameter docbook in the dp mst code - Dave
Airlie correctly pointed out that we don't actually want kerneldoc for
the missing structure members in header files.
Cc: Dave Airlie <airlied@gmail.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
In general having this can't hurt, and the atomic helpers will need
it to be able to reset the state objects properly. The overall idea
is to reset in the order pixels flow, so planes -> crtcs ->
encoders -> connectors.
v2: Squash in fixup from Ville to correctly deference struct drm_plane
instead of drm_crtc when walking the plane list. Fixes an oops in
driver init and resume.
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Atomic implemenations for legacy ioctls must be able to drop locks.
Which doesn't cause havoc since we only do that while constructing
the new state, so no driver or hardware state change has happened.
The only troubling bit is the fb refcounting the core does - if
someone else has snuck in then it might potentially unref an
outdated framebuffer. To fix that move the old_fb temporary storage
into struct drm_plane for all ioctls, so that the atomic helpers can
update it.
v2: Fix up the error case handling as suggested by Matt Roper and just
grab locks uncoditionally - there's no point in optimizing the locking
for when userspace gets it wrong.
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
So drivers using the atomic interfaces expect that they can acquire
additional locks internal to the driver as-needed. Examples would be
locks to protect shared state like shared display PLLs.
Unfortunately the legacy ioctls assume that all locking is fully done
by the drm core. Now for those paths which grab all locks we already
have to keep around an acquire context in dev->mode_config. Helper
functions that implement legacy interfaces in terms of atomic support
can therefore grab this acquire contexts and reuse it.
The only interfaces left are the cursor and pageflip ioctls. So add
functions to grab the crtc lock these need using an acquire context
and preserve it for atomic drivers to reuse.
v2:
- Fixup comments&kerneldoc.
- Drop the WARNING from modeset_lock_all_crtcs since that can be used
in legacy paths with crtc locking.
v3: Fix a type on the kerneldoc Dave spotted.
Cc: Dave Airlie <airlied@redhat.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Somehow we've forgotten about this little bit of OCD.
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
In the atomic state we'll have an array of states for crtcs, planes
and connectors and need to be able to at them by their index. We
already have a drm_crtc_index function so add the missing ones for
planes and connectors.
If it later on turns out that the list walking is too expensive we can
add the index to the relevant modeset objects.
Rob Clark doesn't like the loops too much, but we can always add an
obj->idx parameter later on. And for now reiterating is actually safer
since nowadays we have hotpluggable connectors (thanks to DP MST).
v2: Fix embarrassing copypasta fail in kerneldoc and header
declarations, spotted by Matt Roper.
Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This reverts commit 48ba813701.
Thanks to Chris:
"drm_file->is_master is not synomous with having drm_file->master ==
drm_file->minor->master. This is because drm_file->master is the same
for all drm_files of the same generation and so when there is a master,
every drm_file believes itself to be the master. Confusion ensues and
things go pear shaped when one file is closed and there is no master
anymore."
Conflicts:
drivers/gpu/drm/drm_drv.c
drivers/gpu/drm/drm_stub.c
i915.ko has a custom fbdev initialisation routine that aims to preserve
the current mode set by the BIOS, unless overruled by the user. The
user's wishes are determined by what, if any, mode is specified on the
command line (via the video= parameter). However, that command line mode
is first parsed by drm_fb_helper_initial_config() which is called after
i915.ko's custom initial_config() as a fallback method. So in order for
us to honour it, we need to move the cmdline parser earlier. If we
perform the connector cmdline parsing as soon as we initialise the
connector, that cmdline mode and forced status is then available even if
the fbdev helper is not compiled in or never called.
We also then expose the cmdline user mode in the connector mode lists.
v2: Rebase after connector->name upheaval.
v3: Adapt mga200 to look for the cmdline mode in the new place. Nicely
simplifies things while at that.
v4: Fix checkpatch.
v5: Select FB_CMDLINE to adapt to the changed fbdev patch.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=73154
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> (v2)
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> (v2)
Cc: dri-devel@lists.freedesktop.org
Cc: Julia Lemire <jlemire@matrox.com>
Cc: Dave Airlie <airlied@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
The current refcounting scheme is that the fb lookup idr also holds a
reference. This works out nicely bacause thus far we've always
explicitly cleaned up idr entries for framebuffers:
- Userspace fbs get removed in the rmfb ioctl or when the drm file
gets closed.
- Kernel fbs (for fbdev emulation) get cleaned up by the driver code
at module unload time.
But now i915 also reconstructs the bios fbs for a smooth transition.
And that fb is purely transitional and should get removed immmediately
once all crtcs stop using it. Of course if the i915 fbdev code decides
to reuse it as the main fbdev fb then it shouldn't be cleaned up, but
in that case the fbdev code will grab it's own reference.
The problem is now that we also want to register that takeover fb in
the idr, so that userspace can do a smooth transition (animated maybe
even!) itself. But currently we have no one who will clean up the idr
reference once that fb isn't useful any more, and so essentially leak
it.
Fix this by no longer holding a full fb reference for the idr, but
instead just have a weak reference using kref_get_unless_zero. But
that requires us to synchronize and clean up with the idr and fb_lock
in drm_framebuffer_free, so add that. It's a bit ugly that we have to
unconditionally grab the fb_lock, but without that someone might creep
through a race.
This leak was caught by the fb leak check in drm_mode_config_cleanup.
Originally the leak was introduced in
commit 46f297fb83
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date: Fri Mar 7 08:57:48 2014 -0800
drm/i915: add plane_config fetching infrastructure v2
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=77511
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
bunch of cleanups
* 'drm-next' of git://people.freedesktop.org/~dvdhrm/linux:
drm: mark drm_context support as legacy
drm: make sysfs device always available for minors
drm: make minor->index available early
drm: merge drm_drv.c into drm_ioctl.c
drm: move module initialization to drm_stub.c
drm: don't de-authenticate clients on master-close
drm: drop redundant drm_file->is_master
drm: extract legacy ctxbitmap flushing
The drm_file->is_master field is redundant as it's equivalent to:
drm_file->master && drm_file->master == drm_file->minor->master
1) "=>"
Whenever we set drm_file->is_master, we also set:
drm_file->minor->master = drm_file->master;
Whenever we clear drm_file->is_master, we also call:
drm_master_put(&drm_file->minor->master);
which implicitly clears it to NULL.
2) "<="
minor->master cannot be set if it is non-NULL. Therefore, it stays as
is unless a file drops it.
If minor->master is NULL, it is only set by places that also adjust
drm_file->is_master.
Therefore, we can safely drop is_master and replace it by an inline helper
that matches:
drm_file->master && drm_file->master == drm_file->minor->master
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
In my review of
commit 98f75de40e
Author: Rob Clark <robdclark@gmail.com>
Date: Fri May 30 11:37:03 2014 -0400
drm: add object property typ
I asked for a check to make sure that we never leak an fb from the
generic mode object lookup since those have completely different
lifetime rules. Rob added it, but outside of the idr mutex, which
means that our dereference of obj->type can already chase free'd
memory.
Somehow I didn't spot this, so fix this asap.
v2: Simplify the conditionals as suggested by Chris.
Cc: Rob Clark <robdclark@gmail.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
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: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Pull in drm-next with Dave's DP MST support so that I can merge some
conflicting patches which also touch the driver load sequencing around
interrupt handling.
Conflicts:
drivers/gpu/drm/i915/intel_display.c
drivers/gpu/drm/i915/intel_dp.c
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Added a property to enable user space to set aspect ratio.
This patch contains declaration of the property and code to create the
property.
v2: Thierry's review comments.
- Made aspect ratio enum generic instead of HDMI/CEA specfic
- Removed usage of temporary aspect_ratio variable
v3: Thierry's review comments.
- Fixed indentation
v4: Thierry's review comments.
- Return ENOMEM when property creation fails
Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
The drm_property_create_enum(), drm_property_create_bitmask() and
drm_property_create_range() contain the wrong name in the kerneldoc
comment. This is probably simply a copy/paste mistake.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drm_rotation_simplify() can be used to eliminate unsupported rotation
flags. It will check if any unsupported flags are present, and if so
it will modify the rotation to an alternate form by adding 180 degrees
to rotation angle, and flipping the reflect x and y bits. The hope is
that this identity transform will eliminate the unsupported flags.
Of course that might not result in any more supported rotation, so
the caller is still responsible for checking the result afterwards.
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Acked-by: Dave Airlie <airlied@linux.ie>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Add a function to create a standards compliant rotation property.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Acked-by: Dave Airlie <airlied@linux.ie>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
