2014-04-02 06:22:35 +08:00
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/*
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* Copyright (C) 2014 Intel Corporation
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*
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* DRM universal plane helper functions
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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 (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* 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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/list.h>
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2019-05-27 01:35:35 +08:00
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2014-11-05 05:57:27 +08:00
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#include <drm/drm_atomic.h>
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2019-05-27 01:35:35 +08:00
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#include <drm/drm_atomic_helper.h>
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2018-09-05 21:57:11 +08:00
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#include <drm/drm_atomic_uapi.h>
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2019-05-27 01:35:35 +08:00
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#include <drm/drm_device.h>
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2022-09-09 18:59:46 +08:00
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#include <drm/drm_drv.h>
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2016-11-29 02:51:09 +08:00
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#include <drm/drm_encoder.h>
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2019-05-27 01:35:35 +08:00
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#include <drm/drm_plane_helper.h>
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2022-09-09 18:59:46 +08:00
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#include <drm/drm_print.h>
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2019-05-27 01:35:35 +08:00
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#include <drm/drm_rect.h>
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2014-04-02 06:22:35 +08:00
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#define SUBPIXEL_MASK 0xffff
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2014-11-07 03:53:29 +08:00
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/**
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* DOC: overview
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*
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* This helper library has two parts. The first part has support to implement
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* primary plane support on top of the normal CRTC configuration interface.
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2017-01-25 14:26:43 +08:00
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* Since the legacy &drm_mode_config_funcs.set_config interface ties the primary
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* plane together with the CRTC state this does not allow userspace to disable
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2018-10-05 17:47:32 +08:00
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* the primary plane itself. The default primary plane only expose XRBG8888 and
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* ARGB8888 as valid pixel formats for the attached framebuffer.
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2014-11-07 03:53:29 +08:00
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*
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* Drivers are highly recommended to implement proper support for primary
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* planes, and newly merged drivers must not rely upon these transitional
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* helpers.
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*
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* The second part also implements transitional helpers which allow drivers to
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* gradually switch to the atomic helper infrastructure for plane updates. Once
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* that switch is complete drivers shouldn't use these any longer, instead using
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* the proper legacy implementations for update and disable plane hooks provided
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* by the atomic helpers.
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*
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* Again drivers are strongly urged to switch to the new interfaces.
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2015-12-04 16:45:44 +08:00
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*
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* The plane helpers share the function table structures with other helpers,
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2016-12-30 04:48:26 +08:00
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* specifically also the atomic helpers. See &struct drm_plane_helper_funcs for
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2015-12-04 16:45:44 +08:00
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* the details.
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2014-11-07 03:53:29 +08:00
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*/
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2014-04-02 06:22:35 +08:00
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/*
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* Returns the connectors currently associated with a CRTC. This function
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* should be called twice: once with a NULL connector list to retrieve
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* the list size, and once with the properly allocated list to be filled in.
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*/
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static int get_connectors_for_crtc(struct drm_crtc *crtc,
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struct drm_connector **connector_list,
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int num_connectors)
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{
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struct drm_device *dev = crtc->dev;
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struct drm_connector *connector;
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2016-12-15 23:58:43 +08:00
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struct drm_connector_list_iter conn_iter;
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2014-04-02 06:22:35 +08:00
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int count = 0;
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drm: Split connection_mutex out of mode_config.mutex (v3)
After the split-out of crtc locks from the big mode_config.mutex
there's still two major areas it protects:
- Various connector probe states, like connector->status, EDID
properties, probed mode lists and similar information.
- The links from connector->encoder and encoder->crtc and other
modeset-relevant connector state (e.g. properties which control the
panel fitter).
The later is used by modeset operations. But they don't really care
about the former since it's allowed to e.g. enable a disconnected VGA
output or with a mode not in the probed list.
Thus far this hasn't been a problem, but for the atomic modeset
conversion Rob Clark needs to convert all modeset relevant locks into
w/w locks. This is required because the order of acquisition is
determined by how userspace supplies the atomic modeset data. This has
run into troubles in the detect path since the i915 load detect code
needs _both_ protections offered by the mode_config.mutex: It updates
probe state and it needs to change the modeset configuration to enable
the temporary load detect pipe.
The big deal here is that for the probe/detect users of this lock a
plain mutex fits best, but for atomic modesets we really want a w/w
mutex. To fix this lets split out a new connection_mutex lock for the
modeset relevant parts.
For simplicity I've decided to only add one additional lock for all
connector/encoder links and modeset configuration states. We have
piles of different modeset objects in addition to those (like bridges
or panels), so adding per-object locks would be much more effort.
Also, we're guaranteed (at least for now) to do a full modeset if we
need to acquire this lock. Which means that fine-grained locking is
fairly irrelevant compared to the amount of time the full modeset will
take.
I've done a full audit, and there's just a few things that justify
special focus:
- Locking in drm_sysfs.c is almost completely absent. We should
sprinkle mode_config.connection_mutex over this file a bit, but
since it already lacks mode_config.mutex this patch wont make the
situation any worse. This is material for a follow-up patch.
- omap has a omap_framebuffer_flush function which walks the
connector->encoder->crtc links and is called from many contexts.
Some look like they don't acquire mode_config.mutex, so this is
already racy. Again fixing this is material for a separate patch.
- The radeon hot_plug function to retrain DP links looks at
connector->dpms. Currently this happens without any locking, so is
already racy. I think radeon_hotplug_work_func should gain
mutex_lock/unlock calls for the mode_config.connection_mutex.
- Same applies to i915's intel_dp_hot_plug. But again, this is already
racy.
- i915 load_detect code needs to acquire this lock. Which means the
w/w dance due to Rob's work will be nicely contained to _just_ this
function.
I've added fixme comments everywhere where it looks suspicious but in
the sysfs code. After a quick irc discussion with Dave Airlie it
sounds like the lack of locking in there is due to sysfs cleanup fun
at module unload.
v1: original (only compile tested)
v2: missing mutex_init(), etc (from Rob Clark)
v3: i915 needs more care in the conversion:
- Protect the edp pp logic with the connection_mutex.
- Use connection_mutex in the backlight code due to
get_pipe_from_connector.
- Use drm_modeset_lock_all in suspend/resume paths.
- Update lock checks in the overlay code.
Cc: Alex Deucher <alexdeucher@gmail.com>
Cc: Rob Clark <robdclark@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Rob Clark <robdclark@gmail.com>
2014-05-30 05:54:47 +08:00
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/*
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* Note: Once we change the plane hooks to more fine-grained locking we
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* need to grab the connection_mutex here to be able to make these
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* checks.
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*/
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2013-11-20 01:10:12 +08:00
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WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
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drm: Split connection_mutex out of mode_config.mutex (v3)
After the split-out of crtc locks from the big mode_config.mutex
there's still two major areas it protects:
- Various connector probe states, like connector->status, EDID
properties, probed mode lists and similar information.
- The links from connector->encoder and encoder->crtc and other
modeset-relevant connector state (e.g. properties which control the
panel fitter).
The later is used by modeset operations. But they don't really care
about the former since it's allowed to e.g. enable a disconnected VGA
output or with a mode not in the probed list.
Thus far this hasn't been a problem, but for the atomic modeset
conversion Rob Clark needs to convert all modeset relevant locks into
w/w locks. This is required because the order of acquisition is
determined by how userspace supplies the atomic modeset data. This has
run into troubles in the detect path since the i915 load detect code
needs _both_ protections offered by the mode_config.mutex: It updates
probe state and it needs to change the modeset configuration to enable
the temporary load detect pipe.
The big deal here is that for the probe/detect users of this lock a
plain mutex fits best, but for atomic modesets we really want a w/w
mutex. To fix this lets split out a new connection_mutex lock for the
modeset relevant parts.
For simplicity I've decided to only add one additional lock for all
connector/encoder links and modeset configuration states. We have
piles of different modeset objects in addition to those (like bridges
or panels), so adding per-object locks would be much more effort.
Also, we're guaranteed (at least for now) to do a full modeset if we
need to acquire this lock. Which means that fine-grained locking is
fairly irrelevant compared to the amount of time the full modeset will
take.
I've done a full audit, and there's just a few things that justify
special focus:
- Locking in drm_sysfs.c is almost completely absent. We should
sprinkle mode_config.connection_mutex over this file a bit, but
since it already lacks mode_config.mutex this patch wont make the
situation any worse. This is material for a follow-up patch.
- omap has a omap_framebuffer_flush function which walks the
connector->encoder->crtc links and is called from many contexts.
Some look like they don't acquire mode_config.mutex, so this is
already racy. Again fixing this is material for a separate patch.
- The radeon hot_plug function to retrain DP links looks at
connector->dpms. Currently this happens without any locking, so is
already racy. I think radeon_hotplug_work_func should gain
mutex_lock/unlock calls for the mode_config.connection_mutex.
- Same applies to i915's intel_dp_hot_plug. But again, this is already
racy.
- i915 load_detect code needs to acquire this lock. Which means the
w/w dance due to Rob's work will be nicely contained to _just_ this
function.
I've added fixme comments everywhere where it looks suspicious but in
the sysfs code. After a quick irc discussion with Dave Airlie it
sounds like the lack of locking in there is due to sysfs cleanup fun
at module unload.
v1: original (only compile tested)
v2: missing mutex_init(), etc (from Rob Clark)
v3: i915 needs more care in the conversion:
- Protect the edp pp logic with the connection_mutex.
- Use connection_mutex in the backlight code due to
get_pipe_from_connector.
- Use drm_modeset_lock_all in suspend/resume paths.
- Update lock checks in the overlay code.
Cc: Alex Deucher <alexdeucher@gmail.com>
Cc: Rob Clark <robdclark@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Rob Clark <robdclark@gmail.com>
2014-05-30 05:54:47 +08:00
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2017-02-28 22:46:43 +08:00
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drm_connector_list_iter_begin(dev, &conn_iter);
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2016-12-15 23:58:43 +08:00
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drm_for_each_connector_iter(connector, &conn_iter) {
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2014-04-02 06:22:35 +08:00
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if (connector->encoder && connector->encoder->crtc == crtc) {
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if (connector_list != NULL && count < num_connectors)
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*(connector_list++) = connector;
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count++;
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}
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2015-07-10 05:44:34 +08:00
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}
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2017-02-28 22:46:43 +08:00
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drm_connector_list_iter_end(&conn_iter);
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2014-04-02 06:22:35 +08:00
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return count;
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}
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2018-10-05 04:24:42 +08:00
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static int drm_plane_helper_check_update(struct drm_plane *plane,
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struct drm_crtc *crtc,
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struct drm_framebuffer *fb,
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struct drm_rect *src,
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struct drm_rect *dst,
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unsigned int rotation,
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int min_scale,
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int max_scale,
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bool can_position,
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bool can_update_disabled,
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bool *visible)
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2016-08-08 15:55:10 +08:00
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{
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2017-11-02 04:15:58 +08:00
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struct drm_plane_state plane_state = {
|
2016-08-08 15:55:10 +08:00
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.plane = plane,
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.crtc = crtc,
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.fb = fb,
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.src_x = src->x1,
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.src_y = src->y1,
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.src_w = drm_rect_width(src),
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.src_h = drm_rect_height(src),
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.crtc_x = dst->x1,
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.crtc_y = dst->y1,
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.crtc_w = drm_rect_width(dst),
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.crtc_h = drm_rect_height(dst),
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.rotation = rotation,
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};
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2017-11-02 04:15:58 +08:00
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struct drm_crtc_state crtc_state = {
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.crtc = crtc,
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.enable = crtc->enabled,
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2018-01-24 01:08:57 +08:00
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.mode = crtc->mode,
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2017-11-02 04:15:58 +08:00
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};
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2016-08-08 15:55:10 +08:00
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int ret;
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2017-11-02 04:16:19 +08:00
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ret = drm_atomic_helper_check_plane_state(&plane_state, &crtc_state,
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2018-01-24 01:08:57 +08:00
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min_scale, max_scale,
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2017-11-02 04:16:19 +08:00
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can_position,
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can_update_disabled);
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2016-08-08 15:55:10 +08:00
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if (ret)
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return ret;
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2017-11-02 04:15:58 +08:00
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*src = plane_state.src;
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*dst = plane_state.dst;
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*visible = plane_state.visible;
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2016-08-08 15:55:10 +08:00
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return 0;
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}
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2014-05-29 23:06:52 +08:00
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2022-07-20 16:30:56 +08:00
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/**
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* drm_plane_helper_update_primary - Helper for updating primary planes
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* @plane: plane to update
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* @crtc: the plane's new CRTC
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* @fb: the plane's new framebuffer
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* @crtc_x: x coordinate within CRTC
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* @crtc_y: y coordinate within CRTC
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* @crtc_w: width coordinate within CRTC
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* @crtc_h: height coordinate within CRTC
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* @src_x: x coordinate within source
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* @src_y: y coordinate within source
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* @src_w: width coordinate within source
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* @src_h: height coordinate within source
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* @ctx: modeset locking context
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*
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* This helper validates the given parameters and updates the primary plane.
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*
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* This function is only useful for non-atomic modesetting. Don't use
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* it in new drivers.
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*
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* Returns:
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* Zero on success, or an errno code otherwise.
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*/
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int drm_plane_helper_update_primary(struct drm_plane *plane, struct drm_crtc *crtc,
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struct drm_framebuffer *fb,
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int crtc_x, int crtc_y,
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unsigned int crtc_w, unsigned int crtc_h,
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uint32_t src_x, uint32_t src_y,
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uint32_t src_w, uint32_t src_h,
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struct drm_modeset_acquire_ctx *ctx)
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2014-04-02 06:22:35 +08:00
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{
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struct drm_mode_set set = {
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.crtc = crtc,
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.fb = fb,
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.mode = &crtc->mode,
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.x = src_x >> 16,
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.y = src_y >> 16,
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};
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2014-05-29 23:06:52 +08:00
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struct drm_rect src = {
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.x1 = src_x,
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.y1 = src_y,
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.x2 = src_x + src_w,
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.y2 = src_y + src_h,
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};
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2014-04-02 06:22:35 +08:00
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struct drm_rect dest = {
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.x1 = crtc_x,
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.y1 = crtc_y,
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.x2 = crtc_x + crtc_w,
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.y2 = crtc_y + crtc_h,
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};
|
2022-09-09 18:59:46 +08:00
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struct drm_device *dev = plane->dev;
|
2014-04-02 06:22:35 +08:00
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struct drm_connector **connector_list;
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int num_connectors, ret;
|
2014-05-29 23:06:52 +08:00
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bool visible;
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2014-04-02 06:22:35 +08:00
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2022-09-09 18:59:46 +08:00
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if (drm_WARN_ON_ONCE(dev, drm_drv_uses_atomic_modeset(dev)))
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return -EINVAL;
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|
2014-05-29 23:06:52 +08:00
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ret = drm_plane_helper_check_update(plane, crtc, fb,
|
2018-01-24 01:08:57 +08:00
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&src, &dest,
|
2017-05-20 04:50:17 +08:00
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DRM_MODE_ROTATE_0,
|
2022-07-20 16:30:54 +08:00
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DRM_PLANE_NO_SCALING,
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DRM_PLANE_NO_SCALING,
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2014-05-29 23:06:52 +08:00
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false, false, &visible);
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2014-04-02 06:22:35 +08:00
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if (ret)
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return ret;
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2014-05-29 23:06:52 +08:00
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if (!visible)
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/*
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* Primary plane isn't visible. Note that unless a driver
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* provides their own disable function, this will just
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* wind up returning -EINVAL to userspace.
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*/
|
2017-03-23 05:50:43 +08:00
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return plane->funcs->disable_plane(plane, ctx);
|
2014-05-29 23:06:52 +08:00
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2014-04-02 06:22:35 +08:00
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/* Find current connectors for CRTC */
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num_connectors = get_connectors_for_crtc(crtc, NULL, 0);
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BUG_ON(num_connectors == 0);
|
2017-10-13 15:37:47 +08:00
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connector_list = kcalloc(num_connectors, sizeof(*connector_list),
|
2014-04-02 06:22:35 +08:00
|
|
|
GFP_KERNEL);
|
|
|
|
if (!connector_list)
|
|
|
|
return -ENOMEM;
|
|
|
|
get_connectors_for_crtc(crtc, connector_list, num_connectors);
|
|
|
|
|
|
|
|
set.connectors = connector_list;
|
|
|
|
set.num_connectors = num_connectors;
|
|
|
|
|
|
|
|
/*
|
2014-04-23 23:34:06 +08:00
|
|
|
* We call set_config() directly here rather than using
|
2014-04-02 06:22:35 +08:00
|
|
|
* drm_mode_set_config_internal. We're reprogramming the same
|
|
|
|
* connectors that were already in use, so we shouldn't need the extra
|
2021-07-30 21:27:29 +08:00
|
|
|
* cross-CRTC fb refcounting to accommodate stealing connectors.
|
2014-04-02 06:22:35 +08:00
|
|
|
* drm_mode_setplane() already handles the basic refcounting for the
|
|
|
|
* framebuffers involved in this operation.
|
|
|
|
*/
|
2017-03-23 05:50:57 +08:00
|
|
|
ret = crtc->funcs->set_config(&set, ctx);
|
2014-04-02 06:22:35 +08:00
|
|
|
|
|
|
|
kfree(connector_list);
|
|
|
|
return ret;
|
|
|
|
}
|
2022-07-20 16:30:56 +08:00
|
|
|
EXPORT_SYMBOL(drm_plane_helper_update_primary);
|
2014-04-02 06:22:35 +08:00
|
|
|
|
2022-07-20 16:30:56 +08:00
|
|
|
/**
|
|
|
|
* drm_plane_helper_disable_primary - Helper for disabling primary planes
|
|
|
|
* @plane: plane to disable
|
|
|
|
* @ctx: modeset locking context
|
|
|
|
*
|
|
|
|
* This helper returns an error when trying to disable the primary
|
|
|
|
* plane.
|
|
|
|
*
|
|
|
|
* This function is only useful for non-atomic modesetting. Don't use
|
|
|
|
* it in new drivers.
|
|
|
|
*
|
|
|
|
* Returns:
|
|
|
|
* An errno code.
|
|
|
|
*/
|
|
|
|
int drm_plane_helper_disable_primary(struct drm_plane *plane,
|
|
|
|
struct drm_modeset_acquire_ctx *ctx)
|
2014-04-02 06:22:35 +08:00
|
|
|
{
|
2022-09-09 18:59:46 +08:00
|
|
|
struct drm_device *dev = plane->dev;
|
|
|
|
|
|
|
|
drm_WARN_ON_ONCE(dev, drm_drv_uses_atomic_modeset(dev));
|
|
|
|
|
2014-04-15 16:02:43 +08:00
|
|
|
return -EINVAL;
|
2014-04-02 06:22:35 +08:00
|
|
|
}
|
2022-07-20 16:30:56 +08:00
|
|
|
EXPORT_SYMBOL(drm_plane_helper_disable_primary);
|
2014-04-02 06:22:35 +08:00
|
|
|
|
|
|
|
/**
|
2022-07-20 16:30:56 +08:00
|
|
|
* drm_plane_helper_destroy() - Helper for primary plane destruction
|
2014-04-02 06:22:35 +08:00
|
|
|
* @plane: plane to destroy
|
|
|
|
*
|
|
|
|
* Provides a default plane destroy handler for primary planes. This handler
|
|
|
|
* is called during CRTC destruction. We disable the primary plane, remove
|
|
|
|
* it from the DRM plane list, and deallocate the plane structure.
|
|
|
|
*/
|
2022-07-20 16:30:56 +08:00
|
|
|
void drm_plane_helper_destroy(struct drm_plane *plane)
|
2014-04-02 06:22:35 +08:00
|
|
|
{
|
|
|
|
drm_plane_cleanup(plane);
|
|
|
|
kfree(plane);
|
|
|
|
}
|
2022-07-20 16:30:56 +08:00
|
|
|
EXPORT_SYMBOL(drm_plane_helper_destroy);
|
2022-09-14 00:23:07 +08:00
|
|
|
|
|
|
|
/**
|
|
|
|
* drm_plane_helper_atomic_check() - Helper to check plane atomic-state
|
|
|
|
* @plane: plane to check
|
|
|
|
* @state: atomic state object
|
|
|
|
*
|
|
|
|
* Provides a default plane-state check handler for planes whose atomic-state
|
|
|
|
* scale and positioning are not expected to change since the plane is always
|
|
|
|
* a fullscreen scanout buffer.
|
|
|
|
*
|
2022-10-12 00:51:36 +08:00
|
|
|
* This is often the case for the primary plane of simple framebuffers. See
|
|
|
|
* also drm_crtc_helper_atomic_check() for the respective CRTC-state check
|
|
|
|
* helper function.
|
2022-09-14 00:23:07 +08:00
|
|
|
*
|
|
|
|
* RETURNS:
|
|
|
|
* Zero on success, or an errno code otherwise.
|
|
|
|
*/
|
|
|
|
int drm_plane_helper_atomic_check(struct drm_plane *plane, struct drm_atomic_state *state)
|
|
|
|
{
|
|
|
|
struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
|
|
|
|
struct drm_crtc *new_crtc = new_plane_state->crtc;
|
|
|
|
struct drm_crtc_state *new_crtc_state = NULL;
|
|
|
|
|
|
|
|
if (new_crtc)
|
|
|
|
new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
|
|
|
|
|
|
|
|
return drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
|
|
|
|
DRM_PLANE_NO_SCALING,
|
|
|
|
DRM_PLANE_NO_SCALING,
|
|
|
|
false, false);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(drm_plane_helper_atomic_check);
|