Since Daniel documented things with a sledge hammer, we got lots of
nice backtraces in suspend/resume operations, I've check the callers
of this and they all seems safe to me,
This fixes one set of warns I reported.
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
The locking in drm_fb_helper_initial_config is a bit troublesome for a
few reasons:
- We can't just wrap the entire function up into modeset locks since
the fbdev registration might call down into fbcon code, which then
through our ->set_par implementation needs to be able to grab all
modeset locks. So we'd have a neat deadlock.
- This implies though that all current callers don't hold any modeset
locks by necessity, so we have free reign to grab any modeset locks
we need to grab.
- The private state of the fbdev helper doesn't need any protection
through locks, since once we have the fbdev registered it is mostly
invariant or protected through the modeset locking in ->set_par and
other callbacks. We can fully rely on driver having non-racy setup
sequences here. For the initial config computation we actually may
not grab locks since drivers which provide their own magic sauce
(like i915) might need to grab locks themselves.
- We should grab locks though when we probe outputs. Currently there's
not much risk, but already now userspace could start poking at sysfs
files and so probe concurrently. I expect that in the future driver
init will be much more async, and since probing is really
time-consuming this is a prime candidate.
- We must not hold any crtc->mutex locks while calling probe functions
since those might need to lock a crtc for e.g. load detection. i915
is such a driver.
Also it's the probing calls which hit upon piles of new locking
asserts I've recently added in
commit 62ff94a549
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu Jan 23 22:18:47 2014 +0100
drm/crtc-helper: remove LOCKING from kerneldoc
and
commit 6395138505
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu Jan 23 15:14:15 2014 +0100
drm/doc: Repleace LOCKING kerneldoc sections in drm_modes.c
Hence the right fix is to grab the mode_config mutex, but only that
and only right around the probe calls.
It seems to be sufficient to shut up all the locking WARNINGs I see on
i915 and nouveau in drm_fb_helper_initial_config.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
We have two calling contexts for thise function:
- In the crtc helper code itself as part of the ->set_config
implementation. In this calling context all modeset locks are
already held, as they should.
- In drivers not implementing fastboot before the fbdev/fbcon setup
and initialization. This has been added for all drivers in
commit 76a39dbfb2
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Sun Jan 20 23:12:54 2013 +0100
drm/fb-helper: don't disable everything in initial_config
In this calling context we do not hold any modeset locks since the
immediately following call to initialize the fbev emulation grabs
all these locks themselves.
- There are two exceptions to the above rule: shmob doesn't have fbdev
emulation support. I've manually checked the callchain up to the
driver load function and no kms locks are held.
The right fix therefore is to split this helper into an internal and
external version and add the required locking to the function exported
to drivers.
This remedies locking inconsistencies exposed by me adding locking
WARNs as part of the recent kerneldoc abi polishing done in
commit 62ff94a549
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu Jan 23 22:18:47 2014 +0100
drm/crtc-helper: remove LOCKING from kerneldoc
and
commit 6395138505
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu Jan 23 15:14:15 2014 +0100
drm/doc: Repleace LOCKING kerneldoc sections in drm_modes.c
v2: It helps when I actually git add the entire thing.
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Summary of what's included:
- SGX MMU support
- SGX IRQ handling (Page faults and blitter fences)
- Minor Cedarview and Poulsbo unification
- Work queue for ASLE interrupt work
- Various cleanups, style fixes and removal of dead code
* 'gma500-next' of git://github.com/patjak/drm-gma500:
drm/gma500: remove stub .open/postclose
drm/gma500: Code cleanup - inline documentation
drm/gma500: Code cleanup - style fixes
drm/gma500: Code cleanup - removal of centralized exiting of function
drm/gma500/cdv: Cedarview display cleanups
drm/gma500: Unify encoder mode fixup
drm/gma500: Unify _get_core_freq for cdv and psb
drm/gma500: Move asle interrupt work into a work task
drm/gma500: Remove dead code
drm/gma500: Add backing type and base align to psb_gem_create()
drm/gma500: Remove unused ioctls
drm/gma500: Always trap MMU page faults
drm/gma500: Hook up the MMU
drm/gma500: Add first piece of blitter code
drm/gma500: Give MMU code it's own header file
drm/gma500: Add support for SGX interrupts
drm/gma500: Make SGX MMU driver actually do something
Not sure why git didn't flag this, but the result of automerge
from 3.14-rc7 screwed up the radeon init procedure.
Reported-by: Fireburn on #radeon
Signed-off-by: Dave Airlie <airlied@redhat.com>
Merge straggling core drm patches.
* 'topic/core-stuff' of git://git.freedesktop.org/git/drm-intel:
drm: Fix use-after-free in the shadow-attache exit code
drm/fb-helper: Do the 'max_conn_count' zero check
drm: Check if the allocation has succeeded before dereferencing newmode
drm/fb-helper: Use drm_fb_helper_restore_fbdev_mode() in drm_fb_helper_set_par()
drm/edid: request HDMI underscan by default
The sg_table made when gem cma is created isn't used anywhere. The sgt
of struct drm_gem_cma_object will have only sg_tabel imported.
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This is the 3rd respin of the drm-anon patches. They allow module unloading, use
the pin_fs_* helpers recommended by Al and are rebased on top of drm-next. Note
that there are minor conflicts with the "drm-minor" branch.
* 'drm-next' of git://people.freedesktop.org/~dvdhrm/linux:
drm: init TTM dev_mapping in ttm_bo_device_init()
drm: use anon-inode instead of relying on cdevs
drm: add pseudo filesystem for shared inodes
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Merge tag 'v3.14-rc7' into drm-next
Linux 3.14-rc7
Backmerge to help out Intel guys.
Here's my drm documentation update and driver api polish pull request.
Alex reviewed the entire pile, I've applied a little bit of spelling
polish in a few places since then and otherwise the Usual Suspects (David,
Rob, ...) don't seem up to have another look at it (I've poked them on
irc). So I think it's as good as it gets ;-)
Note that I've dropped the final imx breaker patch since that's blocked on
imx getting sane. Once that's landed I'll ping you to pick up that
straggler.
* 'drm-docs' of ssh://people.freedesktop.org/~danvet/drm: (34 commits)
drm/imx: remove drm_mode_connector_detach_encoder harder
drm: kerneldoc polish for drm_crtc.c
drm: kerneldoc polish for drm_crtc_helper.c
drm: drop error code for drm_helper_resume_force_mode
drm/crtc-helper: remove LOCKING from kerneldoc
drm: remove return value from drm_helper_mode_fill_fb_struct
drm/doc: Fix misplaced </para>
drm: remove drm_display_mode->private_size
drm: polish function kerneldoc for drm_modes.[hc]
drm/modes: drop maxPitch from drm_mode_validate_size
drm/modes: drop return value from drm_display_mode_from_videomode
drm/modes: remove drm_mode_height/width
drm: extract drm_modes.h for drm_crtc.h functions
drm: move drm_mode related functions into drm_modes.c
drm/doc: Repleace LOCKING kerneldoc sections in drm_modes.c
drm/doc: Integrate drm_modes.c kerneldoc
drm/kms: rip out drm_mode_connector_detach_encoder
drm/doc: Add function reference documentation for drm_mm.c
drm/doc: Overview documentation for drm_mm.c
drm/mm: Remove MM_UNUSED_TARGET
...
Conflicts:
drivers/gpu/drm/i915/Makefile
Makefile cleanup in drm-intel-next conflicts with a build-fix to move
intel_opregion under CONFIG_ACPI.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
These are unused and can safely be dropped. DRM core verifies they're
non-NULL before it calls them.
Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Code cleanup by following i915 constant/variable names and ordering
Code cleanup by following directions from kernel doc: Codingstyle
Code cleanup by following directions from kernel doc: DRM
Signed-off-by: Arthur Borsboom <arthurborsboom@gmail.com>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Removed centralized exiting of function (goto statement), since it was
the only used in one single location with only a return statement.
Signed-off-by: Arthur Borsboom <arthurborsboom@gmail.com>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Previously the backlight code was called from IRQ context which isn't
allowed. This patch moves all the asle work into a work task which takes
care of the locking bug reported by users.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=64221
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
The gma500 driver sets DRIVER_GEM unconditionally, so testing for the
absence of the feature will always fail.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
All of these ioctls are unused and most of them just duplicate what drm
already provides.
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Right now, all we need to know about the blitter is that it's not doing
anything that can be messed up when fiddling with MMU mappings.
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Old MMU code never wrote PDs or PTEs to any registers. Now we do, and
that's a good start.
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
This regression has been introduced in
commit b3f2333de8
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Wed Dec 11 11:34:31 2013 +0100
drm: restrict the device list for shadow attached drivers
Reported-by: Dave Jones <davej@redhat.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Since we cannot make sure the 'max_conn_count' will always be none
zero from the users, and then if max_conn_count equals to zero, the
kcalloc() will return ZERO_SIZE_PTR, which equals to ((void *)16).
So this patch fix this with just doing the 'max_conn_count' zero check
in the front of drm_fb_helper_init().
Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
CC: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
We allocate memory in drm_display_mode_from_vic_index() and use it
without checking the pointer is valid. Fix that.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Use drm_fb_helper_restore_fbdev_mode() in drm_fb_helper_set_par() to
make sure extra planes get disabled whenever fbcon takes over.
Otherwise the code in drm_fb_helper_set_par() was already doing the
exact same thing as drm_fb_helper_restore_fbdev_mode(), so this doesn't
change the behaviour in any other way.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This series contains several cleanups for the DRM-minor handling. All but the
last one reviewed by Daniel and tested by Thierry. Initially, the series
included patches to convert minor-handling to a common base-ID, but have
been NACKed by Daniel so I dropped them and only included the main part in the
last patch. With this in place, drm_global_mutex is no longer needed for
minor-handling (but still for device unregistration..).
There are some pending patches that try to remove the global mutex entirely, but
they need some more reviews and thus are not included.
* 'drm-minor' of git://people.freedesktop.org/~dvdhrm/linux:
drm: make minors independent of global lock
drm: inline drm_minor_get_id()
drm: coding-style fixes in minor handling
drm: remove redundant minor->device field
drm: remove unneeded #ifdef CONFIG_DEBUGFS
drm: rename drm_unplug/get_minor() to drm_minor_register/unregister()
drm: move drm_put_minor() to drm_minor_free()
drm: allocate minors early
drm: add minor-lookup/release helpers
drm: provide device-refcount
drm: turn DRM_MINOR_* into enum
drm: remove unused DRM_MINOR_UNASSIGNED
drm: skip redundant minor-lookup in open path
drm: group dev-lifetime related members
We used to protect minor-lookup and setup by the global drm lock. To
continue our attempts of dropping drm_global_mutex, this patch makes the
minor management independent of it. Furthermore, we make it all atomic and
switch to spin-locks instead of a mutex.
Now that minor-lookup is independent, we also move the
"drm_is_unplugged()" test into the minor-lookup path. There is no reason
to ever return a minor for unplugged objects, so keep that logic internal.
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
We can significantly simplify this helper by using plain multiplication.
Note that we converted the minor-type to an enum earlier so this didn't
work before.
We also fix a minor range-bug here: the limit argument of idr_alloc() is
*exclusive*, not inclusive, so we should use 64 instead of 63 as offset.
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Whenever we access minor->device, we are in a minor->kdev->...->fops
callback so the minor->kdev pointer *must* be valid. Thus, simply use
minor->kdev->devt instead of minor->device and remove the redundant field.
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
No need to check for DEBUGFS, we already have dummy-fallbacks in our
headers.
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drm_get_minor() no longer allocates objects, and drm_unplug_minor() is now
the exact reverse of it. Rename it to _register/unregister() so their
name actually says what they do.
Furthermore, remove the direct minor-ptr and instead pass the minor-type.
This way we know the actual slot of the minor and can reset it if
required.
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
_put/get() are used for ref-counting, which we clearly don't do here.
Rename it to _free() and also use the common drm_minor_* prefix.
Furthermore, avoid passing the minor directly but instead use the type
like the other functions do, this allows us to reset the slot.
We also drop the redundant call to drm_unplug_minor() as drm_minor_free()
is only used from paths were that has already be called.
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Instead of waiting for device-registration, we now allocate minor-objects
during device allocation. The minors are not registered or assigned an ID.
This is still postponed to device-registration.
While at it, remove the superfluous output-parameter in drm_get_minor().
The reason for this early allocation is to make
dev->primary/control/render available atomically. So once the device is
alive, all of them are already set and we never have the situation where
one of them is set after another (they're either NULL or set, but never
changed). This will eventually allow us to reduce minor-ID allocation to
one base-ID instead of a single ID for each.
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Instead of accessing drm_minors_idr directly, this adds a small helper to
hide the internals. This will help us later to remove the drm_global_mutex
requirement for minor-lookup.
Furthermore, this also makes sure that minor->dev is always valid and
takes a reference-count to the device as long as the minor is used in an
open-file. This way, "struct file*"->private_data->dev is guaranteed to be
valid (which it has to, as we cannot reset it).
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Lets not trick ourselves into thinking "drm_device" objects are not
ref-counted. That's just utterly stupid. We manage "drm_minor" objects on
each drm-device and each minor can have an unlimited number of open
handles. Each of these handles has the drm_minor (and thus the drm_device)
as private-data in the file-handle. Therefore, we may not destroy
"drm_device" until all these handles are closed.
It is *not* possible to reset all these pointers atomically and restrict
access to them, and this is *not* how this is done! Instead, we use
ref-counts to make sure the object is valid and not freed.
Note that we currently use "dev->open_count" for that, which is *exactly*
the same as a reference-count, just open coded. So this patch doesn't
change any semantics on DRM devices (well, this patch just introduces the
ref-count, anyway. Follow-up patches will replace open_count by it).
Also note that generic VFS revoke support could allow us to drop this
ref-count again. We could then just synchronously disable any fops->xy()
calls. However, this is not the case, yet, and no such patches are
in sight (and I seriously question the idea of dropping the ref-cnt
again).
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
The drm_open_helper() function is only used internally for drm_open() so
we can safely pass in the minor-object directly instead of the minor-id.
This way, we avoid the additional minor IDR lookup, which we already do
twice in drm_stub_open() and drm_open().
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
With dev->anon_inode we have a global address_space ready for operation
right from the beginning. Therefore, there is no need to do a delayed
setup with TTM. Instead, set dev_mapping during initialization in
ttm_bo_device_init() and remove any "if (dev_mapping)" conditions.
Cc: Dave Airlie <airlied@redhat.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Cc: Alex Deucher <alexdeucher@gmail.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
DRM drivers share a common address_space across all character-devices of a
single DRM device. This allows simple buffer eviction and mapping-control.
However, DRM core currently waits for the first ->open() on any char-dev
to mark the underlying inode as backing inode of the device. This delayed
initialization causes ugly conditions all over the place:
if (dev->dev_mapping)
do_sth();
To avoid delayed initialization and to stop reusing the inode of the
char-dev, we allocate an anonymous inode for each DRM device and reset
filp->f_mapping to it on ->open().
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Our current DRM design uses a single address_space for all users of the
same DRM device. However, there is no way to create an anonymous
address_space without an underlying inode. Therefore, we wait for the
first ->open() callback on a registered char-dev and take-over the inode
of the char-dev. This worked well so far, but has several drawbacks:
- We screw with FS internals and rely on some non-obvious invariants like
inode->i_mapping being the same as inode->i_data for char-devs.
- We don't have any address_space prior to the first ->open() from
user-space. This leads to ugly fallback code and we cannot allocate
global objects early.
As pointed out by Al-Viro, fs/anon_inode.c is *not* supposed to be used by
drivers for anonymous inode-allocation. Therefore, this patch follows the
proposed alternative solution and adds a pseudo filesystem mount-point to
DRM. We can then allocate private inodes including a private address_space
for each DRM device at initialization time.
Note that we could use:
sysfs_get_inode(sysfs_mnt->mnt_sb, drm_device->dev->kobj.sd);
to get access to the underlying sysfs-inode of a "struct device" object.
However, most of this information is currently hidden and it's not clear
whether this address_space is suitable for driver access. Thus, unless
linux allows anonymous address_space objects or driver-core provides a
public inode per device, we're left with our own private internal mount
point.
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
There is no need to initialize this variable, so drop it. Otherwise, the
compiler won't warn if we use it unintialized.
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
