2013-11-19 10:10:12 -07:00
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/*
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* Copyright (C) 2014 Red Hat
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* Author: Rob Clark <robdclark@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <drm/drmP.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_modeset_lock.h>
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/**
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* DOC: kms locking
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*
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* As KMS moves toward more fine grained locking, and atomic ioctl where
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* userspace can indirectly control locking order, it becomes necessary
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2016-05-30 03:10:49 -06:00
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* to use &ww_mutex and acquire-contexts to avoid deadlocks. But because
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2013-11-19 10:10:12 -07:00
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* the locking is more distributed around the driver code, we want a bit
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* of extra utility/tracking out of our acquire-ctx. This is provided
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2017-01-24 23:26:45 -07:00
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* by &struct drm_modeset_lock and &struct drm_modeset_acquire_ctx.
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2013-11-19 10:10:12 -07:00
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*
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2016-05-30 03:10:49 -06:00
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* For basic principles of &ww_mutex, see: Documentation/locking/ww-mutex-design.txt
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2013-11-19 10:10:12 -07:00
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*
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2016-05-31 14:55:13 -06:00
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* The basic usage pattern is to::
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2013-11-19 10:10:12 -07:00
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*
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* drm_modeset_acquire_init(&ctx)
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2015-11-25 10:07:55 -07:00
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* retry:
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2013-11-19 10:10:12 -07:00
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* foreach (lock in random_ordered_set_of_locks) {
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2015-11-25 10:07:55 -07:00
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* ret = drm_modeset_lock(lock, &ctx)
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* if (ret == -EDEADLK) {
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* drm_modeset_backoff(&ctx);
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* goto retry;
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* }
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2013-11-19 10:10:12 -07:00
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* }
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* ... do stuff ...
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* drm_modeset_drop_locks(&ctx);
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* drm_modeset_acquire_fini(&ctx);
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2016-05-30 03:10:49 -06:00
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*
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2016-11-29 02:24:40 -07:00
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* On top of of these per-object locks using &ww_mutex there's also an overall
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2017-01-24 23:26:45 -07:00
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* &drm_mode_config.mutex, for protecting everything else. Mostly this means
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2016-11-29 02:24:40 -07:00
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* probe state of connectors, and preventing hotplug add/removal of connectors.
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2016-05-30 03:10:49 -06:00
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*
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2016-11-29 02:24:40 -07:00
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* Finally there's a bunch of dedicated locks to protect drm core internal
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* lists and lookup data structures.
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2013-11-19 10:10:12 -07:00
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*/
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2016-11-14 15:40:57 -07:00
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static DEFINE_WW_CLASS(crtc_ww_class);
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2014-07-25 09:47:18 -06:00
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/**
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2015-07-28 05:18:42 -06:00
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* drm_modeset_lock_all - take all modeset locks
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2015-12-02 09:50:03 -07:00
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* @dev: DRM device
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2014-07-27 11:09:33 -06:00
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*
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2015-07-28 05:18:42 -06:00
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* This function takes all modeset locks, suitable where a more fine-grained
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2015-12-02 09:50:03 -07:00
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* scheme isn't (yet) implemented. Locks must be dropped by calling the
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* drm_modeset_unlock_all() function.
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*
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* This function is deprecated. It allocates a lock acquisition context and
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2017-01-24 23:26:45 -07:00
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* stores it in &drm_device.mode_config. This facilitate conversion of
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2015-12-02 09:50:03 -07:00
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* existing code because it removes the need to manually deal with the
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* acquisition context, but it is also brittle because the context is global
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* and care must be taken not to nest calls. New code should use the
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* drm_modeset_lock_all_ctx() function and pass in the context explicitly.
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2014-07-25 09:47:18 -06:00
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*/
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2015-07-28 05:18:42 -06:00
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void drm_modeset_lock_all(struct drm_device *dev)
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2014-07-25 09:47:18 -06:00
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{
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struct drm_mode_config *config = &dev->mode_config;
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struct drm_modeset_acquire_ctx *ctx;
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int ret;
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2015-07-28 05:18:42 -06:00
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ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
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if (WARN_ON(!ctx))
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return;
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mutex_lock(&config->mutex);
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2014-07-25 09:47:18 -06:00
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drm_modeset_acquire_init(ctx, 0);
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retry:
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2015-12-02 09:50:03 -07:00
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ret = drm_modeset_lock_all_ctx(dev, ctx);
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if (ret < 0) {
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if (ret == -EDEADLK) {
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drm_modeset_backoff(ctx);
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goto retry;
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}
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drm_modeset_acquire_fini(ctx);
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kfree(ctx);
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return;
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}
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2014-07-25 09:47:18 -06:00
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WARN_ON(config->acquire_ctx);
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2015-12-02 09:50:03 -07:00
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/*
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* We hold the locks now, so it is safe to stash the acquisition
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* context for drm_modeset_unlock_all().
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2014-07-25 09:47:18 -06:00
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*/
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config->acquire_ctx = ctx;
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drm_warn_on_modeset_not_all_locked(dev);
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}
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EXPORT_SYMBOL(drm_modeset_lock_all);
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/**
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* drm_modeset_unlock_all - drop all modeset locks
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2015-12-02 09:50:03 -07:00
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* @dev: DRM device
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2014-07-25 09:47:18 -06:00
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*
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2015-12-02 09:50:03 -07:00
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* This function drops all modeset locks taken by a previous call to the
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* drm_modeset_lock_all() function.
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*
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* This function is deprecated. It uses the lock acquisition context stored
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2017-01-24 23:26:45 -07:00
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* in &drm_device.mode_config. This facilitates conversion of existing
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2015-12-02 09:50:03 -07:00
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* code because it removes the need to manually deal with the acquisition
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* context, but it is also brittle because the context is global and care must
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* be taken not to nest calls. New code should pass the acquisition context
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* directly to the drm_modeset_drop_locks() function.
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2014-07-25 09:47:18 -06:00
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*/
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void drm_modeset_unlock_all(struct drm_device *dev)
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{
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struct drm_mode_config *config = &dev->mode_config;
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struct drm_modeset_acquire_ctx *ctx = config->acquire_ctx;
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if (WARN_ON(!ctx))
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return;
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config->acquire_ctx = NULL;
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drm_modeset_drop_locks(ctx);
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drm_modeset_acquire_fini(ctx);
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kfree(ctx);
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mutex_unlock(&dev->mode_config.mutex);
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}
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EXPORT_SYMBOL(drm_modeset_unlock_all);
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2014-07-25 10:07:40 -06:00
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/**
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2014-11-11 02:12:00 -07:00
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* drm_modeset_lock_crtc - lock crtc with hidden acquire ctx for a plane update
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* @crtc: DRM CRTC
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* @plane: DRM plane to be updated on @crtc
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*
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* This function locks the given crtc and plane (which should be either the
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* primary or cursor plane) using a hidden acquire context. This is necessary so
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* that drivers internally using the atomic interfaces can grab further locks
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* with the lock acquire context.
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2014-07-25 10:07:40 -06:00
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*
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2014-11-11 02:12:00 -07:00
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* Note that @plane can be NULL, e.g. when the cursor support hasn't yet been
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* converted to universal planes yet.
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2014-07-25 10:07:40 -06:00
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*/
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2014-11-11 02:12:00 -07:00
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void drm_modeset_lock_crtc(struct drm_crtc *crtc,
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struct drm_plane *plane)
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2014-07-25 10:07:40 -06:00
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{
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struct drm_modeset_acquire_ctx *ctx;
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int ret;
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ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
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if (WARN_ON(!ctx))
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return;
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drm_modeset_acquire_init(ctx, 0);
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retry:
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ret = drm_modeset_lock(&crtc->mutex, ctx);
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if (ret)
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goto fail;
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2014-11-11 02:12:00 -07:00
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if (plane) {
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ret = drm_modeset_lock(&plane->mutex, ctx);
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if (ret)
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goto fail;
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if (plane->crtc) {
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ret = drm_modeset_lock(&plane->crtc->mutex, ctx);
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if (ret)
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goto fail;
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}
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}
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2014-07-25 10:07:40 -06:00
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WARN_ON(crtc->acquire_ctx);
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/* now we hold the locks, so now that it is safe, stash the
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* ctx for drm_modeset_unlock_crtc():
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*/
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crtc->acquire_ctx = ctx;
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return;
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fail:
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if (ret == -EDEADLK) {
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drm_modeset_backoff(ctx);
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goto retry;
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}
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}
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EXPORT_SYMBOL(drm_modeset_lock_crtc);
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/**
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* drm_modeset_legacy_acquire_ctx - find acquire ctx for legacy ioctls
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2014-07-30 06:23:44 -06:00
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* @crtc: drm crtc
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2014-07-25 10:07:40 -06:00
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*
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* Legacy ioctl operations like cursor updates or page flips only have per-crtc
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* locking, and store the acquire ctx in the corresponding crtc. All other
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* legacy operations take all locks and use a global acquire context. This
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* function grabs the right one.
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*/
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struct drm_modeset_acquire_ctx *
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drm_modeset_legacy_acquire_ctx(struct drm_crtc *crtc)
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{
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if (crtc->acquire_ctx)
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return crtc->acquire_ctx;
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WARN_ON(!crtc->dev->mode_config.acquire_ctx);
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return crtc->dev->mode_config.acquire_ctx;
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}
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EXPORT_SYMBOL(drm_modeset_legacy_acquire_ctx);
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/**
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* drm_modeset_unlock_crtc - drop crtc lock
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* @crtc: drm crtc
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*
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* This drops the crtc lock acquire with drm_modeset_lock_crtc() and all other
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* locks acquired through the hidden context.
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*/
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void drm_modeset_unlock_crtc(struct drm_crtc *crtc)
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{
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struct drm_modeset_acquire_ctx *ctx = crtc->acquire_ctx;
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if (WARN_ON(!ctx))
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return;
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crtc->acquire_ctx = NULL;
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drm_modeset_drop_locks(ctx);
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drm_modeset_acquire_fini(ctx);
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kfree(ctx);
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}
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EXPORT_SYMBOL(drm_modeset_unlock_crtc);
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2014-07-25 09:47:18 -06:00
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/**
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* drm_warn_on_modeset_not_all_locked - check that all modeset locks are locked
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* @dev: device
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*
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* Useful as a debug assert.
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*/
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void drm_warn_on_modeset_not_all_locked(struct drm_device *dev)
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{
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struct drm_crtc *crtc;
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/* Locking is currently fubar in the panic handler. */
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if (oops_in_progress)
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return;
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2015-07-09 15:44:35 -06:00
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drm_for_each_crtc(crtc, dev)
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2014-07-25 09:47:18 -06:00
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WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
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WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
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WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
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}
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EXPORT_SYMBOL(drm_warn_on_modeset_not_all_locked);
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2013-11-19 10:10:12 -07:00
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/**
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* drm_modeset_acquire_init - initialize acquire context
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* @ctx: the acquire context
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* @flags: for future
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*/
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void drm_modeset_acquire_init(struct drm_modeset_acquire_ctx *ctx,
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uint32_t flags)
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{
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2014-06-07 08:55:39 -06:00
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memset(ctx, 0, sizeof(*ctx));
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2013-11-19 10:10:12 -07:00
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ww_acquire_init(&ctx->ww_ctx, &crtc_ww_class);
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INIT_LIST_HEAD(&ctx->locked);
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}
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EXPORT_SYMBOL(drm_modeset_acquire_init);
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/**
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* drm_modeset_acquire_fini - cleanup acquire context
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* @ctx: the acquire context
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*/
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void drm_modeset_acquire_fini(struct drm_modeset_acquire_ctx *ctx)
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{
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ww_acquire_fini(&ctx->ww_ctx);
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}
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EXPORT_SYMBOL(drm_modeset_acquire_fini);
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/**
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* drm_modeset_drop_locks - drop all locks
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* @ctx: the acquire context
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*
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* Drop all locks currently held against this acquire context.
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*/
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void drm_modeset_drop_locks(struct drm_modeset_acquire_ctx *ctx)
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{
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WARN_ON(ctx->contended);
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while (!list_empty(&ctx->locked)) {
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struct drm_modeset_lock *lock;
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lock = list_first_entry(&ctx->locked,
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struct drm_modeset_lock, head);
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drm_modeset_unlock(lock);
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}
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}
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EXPORT_SYMBOL(drm_modeset_drop_locks);
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static inline int modeset_lock(struct drm_modeset_lock *lock,
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struct drm_modeset_acquire_ctx *ctx,
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bool interruptible, bool slow)
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{
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int ret;
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WARN_ON(ctx->contended);
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|
2014-07-27 11:09:33 -06:00
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if (ctx->trylock_only) {
|
2015-08-27 05:58:09 -06:00
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lockdep_assert_held(&ctx->ww_ctx);
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|
|
2014-07-27 11:09:33 -06:00
|
|
|
if (!ww_mutex_trylock(&lock->mutex))
|
|
|
|
return -EBUSY;
|
|
|
|
else
|
|
|
|
return 0;
|
|
|
|
} else if (interruptible && slow) {
|
2013-11-19 10:10:12 -07:00
|
|
|
ret = ww_mutex_lock_slow_interruptible(&lock->mutex, &ctx->ww_ctx);
|
|
|
|
} else if (interruptible) {
|
|
|
|
ret = ww_mutex_lock_interruptible(&lock->mutex, &ctx->ww_ctx);
|
|
|
|
} else if (slow) {
|
|
|
|
ww_mutex_lock_slow(&lock->mutex, &ctx->ww_ctx);
|
|
|
|
ret = 0;
|
|
|
|
} else {
|
|
|
|
ret = ww_mutex_lock(&lock->mutex, &ctx->ww_ctx);
|
|
|
|
}
|
|
|
|
if (!ret) {
|
|
|
|
WARN_ON(!list_empty(&lock->head));
|
|
|
|
list_add(&lock->head, &ctx->locked);
|
|
|
|
} else if (ret == -EALREADY) {
|
|
|
|
/* we already hold the lock.. this is fine. For atomic
|
|
|
|
* we will need to be able to drm_modeset_lock() things
|
|
|
|
* without having to keep track of what is already locked
|
|
|
|
* or not.
|
|
|
|
*/
|
|
|
|
ret = 0;
|
|
|
|
} else if (ret == -EDEADLK) {
|
|
|
|
ctx->contended = lock;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int modeset_backoff(struct drm_modeset_acquire_ctx *ctx,
|
|
|
|
bool interruptible)
|
|
|
|
{
|
|
|
|
struct drm_modeset_lock *contended = ctx->contended;
|
|
|
|
|
|
|
|
ctx->contended = NULL;
|
|
|
|
|
|
|
|
if (WARN_ON(!contended))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
drm_modeset_drop_locks(ctx);
|
|
|
|
|
|
|
|
return modeset_lock(contended, ctx, interruptible, true);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* drm_modeset_backoff - deadlock avoidance backoff
|
|
|
|
* @ctx: the acquire context
|
|
|
|
*
|
|
|
|
* If deadlock is detected (ie. drm_modeset_lock() returns -EDEADLK),
|
|
|
|
* you must call this function to drop all currently held locks and
|
|
|
|
* block until the contended lock becomes available.
|
|
|
|
*/
|
|
|
|
void drm_modeset_backoff(struct drm_modeset_acquire_ctx *ctx)
|
|
|
|
{
|
|
|
|
modeset_backoff(ctx, false);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(drm_modeset_backoff);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* drm_modeset_backoff_interruptible - deadlock avoidance backoff
|
|
|
|
* @ctx: the acquire context
|
|
|
|
*
|
|
|
|
* Interruptible version of drm_modeset_backoff()
|
|
|
|
*/
|
|
|
|
int drm_modeset_backoff_interruptible(struct drm_modeset_acquire_ctx *ctx)
|
|
|
|
{
|
|
|
|
return modeset_backoff(ctx, true);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(drm_modeset_backoff_interruptible);
|
|
|
|
|
2016-11-14 15:40:57 -07:00
|
|
|
/**
|
|
|
|
* drm_modeset_lock_init - initialize lock
|
|
|
|
* @lock: lock to init
|
|
|
|
*/
|
|
|
|
void drm_modeset_lock_init(struct drm_modeset_lock *lock)
|
|
|
|
{
|
|
|
|
ww_mutex_init(&lock->mutex, &crtc_ww_class);
|
|
|
|
INIT_LIST_HEAD(&lock->head);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(drm_modeset_lock_init);
|
|
|
|
|
2013-11-19 10:10:12 -07:00
|
|
|
/**
|
|
|
|
* drm_modeset_lock - take modeset lock
|
|
|
|
* @lock: lock to take
|
|
|
|
* @ctx: acquire ctx
|
|
|
|
*
|
|
|
|
* If ctx is not NULL, then its ww acquire context is used and the
|
|
|
|
* lock will be tracked by the context and can be released by calling
|
|
|
|
* drm_modeset_drop_locks(). If -EDEADLK is returned, this means a
|
|
|
|
* deadlock scenario has been detected and it is an error to attempt
|
|
|
|
* to take any more locks without first calling drm_modeset_backoff().
|
|
|
|
*/
|
|
|
|
int drm_modeset_lock(struct drm_modeset_lock *lock,
|
|
|
|
struct drm_modeset_acquire_ctx *ctx)
|
|
|
|
{
|
|
|
|
if (ctx)
|
|
|
|
return modeset_lock(lock, ctx, false, false);
|
|
|
|
|
|
|
|
ww_mutex_lock(&lock->mutex, NULL);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(drm_modeset_lock);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* drm_modeset_lock_interruptible - take modeset lock
|
|
|
|
* @lock: lock to take
|
|
|
|
* @ctx: acquire ctx
|
|
|
|
*
|
|
|
|
* Interruptible version of drm_modeset_lock()
|
|
|
|
*/
|
|
|
|
int drm_modeset_lock_interruptible(struct drm_modeset_lock *lock,
|
|
|
|
struct drm_modeset_acquire_ctx *ctx)
|
|
|
|
{
|
|
|
|
if (ctx)
|
|
|
|
return modeset_lock(lock, ctx, true, false);
|
|
|
|
|
|
|
|
return ww_mutex_lock_interruptible(&lock->mutex, NULL);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(drm_modeset_lock_interruptible);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* drm_modeset_unlock - drop modeset lock
|
|
|
|
* @lock: lock to release
|
|
|
|
*/
|
|
|
|
void drm_modeset_unlock(struct drm_modeset_lock *lock)
|
|
|
|
{
|
|
|
|
list_del_init(&lock->head);
|
|
|
|
ww_mutex_unlock(&lock->mutex);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(drm_modeset_unlock);
|
|
|
|
|
2015-12-02 09:50:03 -07:00
|
|
|
/**
|
|
|
|
* drm_modeset_lock_all_ctx - take all modeset locks
|
|
|
|
* @dev: DRM device
|
|
|
|
* @ctx: lock acquisition context
|
|
|
|
*
|
|
|
|
* This function takes all modeset locks, suitable where a more fine-grained
|
|
|
|
* scheme isn't (yet) implemented.
|
|
|
|
*
|
2017-01-24 23:26:45 -07:00
|
|
|
* Unlike drm_modeset_lock_all(), it doesn't take the &drm_mode_config.mutex
|
2015-12-02 09:50:03 -07:00
|
|
|
* since that lock isn't required for modeset state changes. Callers which
|
|
|
|
* need to grab that lock too need to do so outside of the acquire context
|
|
|
|
* @ctx.
|
|
|
|
*
|
|
|
|
* Locks acquired with this function should be released by calling the
|
|
|
|
* drm_modeset_drop_locks() function on @ctx.
|
|
|
|
*
|
|
|
|
* Returns: 0 on success or a negative error-code on failure.
|
|
|
|
*/
|
|
|
|
int drm_modeset_lock_all_ctx(struct drm_device *dev,
|
|
|
|
struct drm_modeset_acquire_ctx *ctx)
|
2013-11-19 10:10:12 -07:00
|
|
|
{
|
|
|
|
struct drm_crtc *crtc;
|
2014-11-11 02:12:00 -07:00
|
|
|
struct drm_plane *plane;
|
2015-12-02 09:50:03 -07:00
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = drm_modeset_lock(&dev->mode_config.connection_mutex, ctx);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
2013-11-19 10:10:12 -07:00
|
|
|
|
2015-07-09 15:44:35 -06:00
|
|
|
drm_for_each_crtc(crtc, dev) {
|
2013-11-19 10:10:12 -07:00
|
|
|
ret = drm_modeset_lock(&crtc->mutex, ctx);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2015-07-09 15:44:35 -06:00
|
|
|
drm_for_each_plane(plane, dev) {
|
2014-11-11 02:12:00 -07:00
|
|
|
ret = drm_modeset_lock(&plane->mutex, ctx);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2013-11-19 10:10:12 -07:00
|
|
|
return 0;
|
|
|
|
}
|
2015-12-02 09:50:03 -07:00
|
|
|
EXPORT_SYMBOL(drm_modeset_lock_all_ctx);
|