![Daniel Vetter](/assets/img/avatar_default.png)
So my original plan was that the drm core refcounts framebuffers like with the legacy ioctls. But that doesn't work for a bunch of reasons: - State objects might live longer than until the next fb change happens for a plane. For example delayed cleanup work only happens _after_ the pageflip ioctl has completed. So this definitely doesn't work without the plane state holding its own references. - The other issue is transition from legacy to atomic implementations, where the driver works under a mix of both worlds. Which means legacy paths might not properly update the ->fb pointer under plane->state->fb. Which is a bit a problem when then someone comes around and _does_ try to clean it up when it's long gone. The second issue is just a bit a transition bug, since drivers should update plane->state->fb in all the paths that aren't converted yet. But a bit more robustness for the transition can't hurt - we pull similar tricks with cleaning up the old fb in the transitional helpers already. The pattern for drivers that transition is if (plane->state) drm_atomic_set_fb_for_plane(plane->state, plane->fb); inserted after the fb update has logically completed at the end of ->set_config (or ->set_base/mode_set if using the crtc helpers), ->page_flip, ->update_plane or any other entry point which updates plane->fb. v2: Update kerneldoc - copypasta fail. v3: Fix spelling in the commit message (Sean). Reviewed-by: Sean Paul <seanpaul@chromium.org> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
629 lines
18 KiB
C
629 lines
18 KiB
C
/*
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* Copyright (C) 2014 Red Hat
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* Copyright (C) 2014 Intel Corp.
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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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* Authors:
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* Rob Clark <robdclark@gmail.com>
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* Daniel Vetter <daniel.vetter@ffwll.ch>
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*/
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#include <drm/drmP.h>
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#include <drm/drm_atomic.h>
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#include <drm/drm_plane_helper.h>
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static void kfree_state(struct drm_atomic_state *state)
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{
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kfree(state->connectors);
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kfree(state->connector_states);
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kfree(state->crtcs);
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kfree(state->crtc_states);
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kfree(state->planes);
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kfree(state->plane_states);
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kfree(state);
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}
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/**
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* drm_atomic_state_alloc - allocate atomic state
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* @dev: DRM device
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*
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* This allocates an empty atomic state to track updates.
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*/
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struct drm_atomic_state *
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drm_atomic_state_alloc(struct drm_device *dev)
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{
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struct drm_atomic_state *state;
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state = kzalloc(sizeof(*state), GFP_KERNEL);
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if (!state)
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return NULL;
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state->crtcs = kcalloc(dev->mode_config.num_crtc,
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sizeof(*state->crtcs), GFP_KERNEL);
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if (!state->crtcs)
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goto fail;
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state->crtc_states = kcalloc(dev->mode_config.num_crtc,
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sizeof(*state->crtc_states), GFP_KERNEL);
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if (!state->crtc_states)
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goto fail;
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state->planes = kcalloc(dev->mode_config.num_total_plane,
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sizeof(*state->planes), GFP_KERNEL);
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if (!state->planes)
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goto fail;
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state->plane_states = kcalloc(dev->mode_config.num_total_plane,
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sizeof(*state->plane_states), GFP_KERNEL);
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if (!state->plane_states)
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goto fail;
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state->connectors = kcalloc(dev->mode_config.num_connector,
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sizeof(*state->connectors),
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GFP_KERNEL);
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if (!state->connectors)
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goto fail;
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state->connector_states = kcalloc(dev->mode_config.num_connector,
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sizeof(*state->connector_states),
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GFP_KERNEL);
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if (!state->connector_states)
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goto fail;
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state->dev = dev;
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DRM_DEBUG_KMS("Allocate atomic state %p\n", state);
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return state;
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fail:
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kfree_state(state);
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return NULL;
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}
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EXPORT_SYMBOL(drm_atomic_state_alloc);
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/**
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* drm_atomic_state_clear - clear state object
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* @state: atomic state
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*
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* When the w/w mutex algorithm detects a deadlock we need to back off and drop
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* all locks. So someone else could sneak in and change the current modeset
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* configuration. Which means that all the state assembled in @state is no
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* longer an atomic update to the current state, but to some arbitrary earlier
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* state. Which could break assumptions the driver's ->atomic_check likely
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* relies on.
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*
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* Hence we must clear all cached state and completely start over, using this
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* function.
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*/
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void drm_atomic_state_clear(struct drm_atomic_state *state)
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{
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struct drm_device *dev = state->dev;
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int i;
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DRM_DEBUG_KMS("Clearing atomic state %p\n", state);
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for (i = 0; i < dev->mode_config.num_connector; i++) {
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struct drm_connector *connector = state->connectors[i];
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if (!connector)
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continue;
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connector->funcs->atomic_destroy_state(connector,
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state->connector_states[i]);
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}
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for (i = 0; i < dev->mode_config.num_crtc; i++) {
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struct drm_crtc *crtc = state->crtcs[i];
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if (!crtc)
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continue;
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crtc->funcs->atomic_destroy_state(crtc,
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state->crtc_states[i]);
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}
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for (i = 0; i < dev->mode_config.num_total_plane; i++) {
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struct drm_plane *plane = state->planes[i];
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if (!plane)
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continue;
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plane->funcs->atomic_destroy_state(plane,
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state->plane_states[i]);
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}
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}
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EXPORT_SYMBOL(drm_atomic_state_clear);
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/**
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* drm_atomic_state_free - free all memory for an atomic state
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* @state: atomic state to deallocate
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*
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* This frees all memory associated with an atomic state, including all the
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* per-object state for planes, crtcs and connectors.
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*/
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void drm_atomic_state_free(struct drm_atomic_state *state)
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{
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drm_atomic_state_clear(state);
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DRM_DEBUG_KMS("Freeing atomic state %p\n", state);
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kfree_state(state);
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}
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EXPORT_SYMBOL(drm_atomic_state_free);
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/**
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* drm_atomic_get_crtc_state - get crtc state
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* @state: global atomic state object
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* @crtc: crtc to get state object for
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*
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* This function returns the crtc state for the given crtc, allocating it if
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* needed. It will also grab the relevant crtc lock to make sure that the state
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* is consistent.
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*
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* Returns:
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*
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* Either the allocated state or the error code encoded into the pointer. When
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* the error is EDEADLK then the w/w mutex code has detected a deadlock and the
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* entire atomic sequence must be restarted. All other errors are fatal.
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*/
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struct drm_crtc_state *
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drm_atomic_get_crtc_state(struct drm_atomic_state *state,
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struct drm_crtc *crtc)
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{
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int ret, index;
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struct drm_crtc_state *crtc_state;
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index = drm_crtc_index(crtc);
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if (state->crtc_states[index])
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return state->crtc_states[index];
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ret = drm_modeset_lock(&crtc->mutex, state->acquire_ctx);
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if (ret)
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return ERR_PTR(ret);
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crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
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if (!crtc_state)
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return ERR_PTR(-ENOMEM);
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state->crtc_states[index] = crtc_state;
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state->crtcs[index] = crtc;
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crtc_state->state = state;
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DRM_DEBUG_KMS("Added [CRTC:%d] %p state to %p\n",
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crtc->base.id, crtc_state, state);
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return crtc_state;
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}
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EXPORT_SYMBOL(drm_atomic_get_crtc_state);
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/**
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* drm_atomic_get_plane_state - get plane state
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* @state: global atomic state object
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* @plane: plane to get state object for
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*
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* This function returns the plane state for the given plane, allocating it if
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* needed. It will also grab the relevant plane lock to make sure that the state
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* is consistent.
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*
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* Returns:
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*
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* Either the allocated state or the error code encoded into the pointer. When
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* the error is EDEADLK then the w/w mutex code has detected a deadlock and the
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* entire atomic sequence must be restarted. All other errors are fatal.
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*/
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struct drm_plane_state *
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drm_atomic_get_plane_state(struct drm_atomic_state *state,
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struct drm_plane *plane)
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{
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int ret, index;
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struct drm_plane_state *plane_state;
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index = drm_plane_index(plane);
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if (state->plane_states[index])
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return state->plane_states[index];
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/*
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* TODO: We currently don't have per-plane mutexes. So instead of trying
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* crazy tricks with deferring plane->crtc and hoping for the best just
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* grab all crtc locks. Once we have per-plane locks we must update this
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* to only take the plane mutex.
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*/
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ret = drm_modeset_lock_all_crtcs(state->dev, state->acquire_ctx);
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if (ret)
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return ERR_PTR(ret);
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plane_state = plane->funcs->atomic_duplicate_state(plane);
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if (!plane_state)
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return ERR_PTR(-ENOMEM);
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state->plane_states[index] = plane_state;
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state->planes[index] = plane;
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plane_state->state = state;
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DRM_DEBUG_KMS("Added [PLANE:%d] %p state to %p\n",
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plane->base.id, plane_state, state);
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if (plane_state->crtc) {
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struct drm_crtc_state *crtc_state;
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crtc_state = drm_atomic_get_crtc_state(state,
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plane_state->crtc);
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if (IS_ERR(crtc_state))
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return ERR_CAST(crtc_state);
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}
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return plane_state;
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}
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EXPORT_SYMBOL(drm_atomic_get_plane_state);
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/**
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* drm_atomic_get_connector_state - get connector state
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* @state: global atomic state object
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* @connector: connector to get state object for
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*
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* This function returns the connector state for the given connector,
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* allocating it if needed. It will also grab the relevant connector lock to
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* make sure that the state is consistent.
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*
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* Returns:
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*
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* Either the allocated state or the error code encoded into the pointer. When
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* the error is EDEADLK then the w/w mutex code has detected a deadlock and the
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* entire atomic sequence must be restarted. All other errors are fatal.
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*/
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struct drm_connector_state *
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drm_atomic_get_connector_state(struct drm_atomic_state *state,
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struct drm_connector *connector)
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{
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int ret, index;
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struct drm_mode_config *config = &connector->dev->mode_config;
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struct drm_connector_state *connector_state;
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index = drm_connector_index(connector);
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if (state->connector_states[index])
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return state->connector_states[index];
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ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
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if (ret)
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return ERR_PTR(ret);
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connector_state = connector->funcs->atomic_duplicate_state(connector);
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if (!connector_state)
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return ERR_PTR(-ENOMEM);
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state->connector_states[index] = connector_state;
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state->connectors[index] = connector;
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connector_state->state = state;
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DRM_DEBUG_KMS("Added [CONNECTOR:%d] %p state to %p\n",
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connector->base.id, connector_state, state);
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if (connector_state->crtc) {
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struct drm_crtc_state *crtc_state;
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crtc_state = drm_atomic_get_crtc_state(state,
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connector_state->crtc);
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if (IS_ERR(crtc_state))
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return ERR_CAST(crtc_state);
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}
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return connector_state;
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}
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EXPORT_SYMBOL(drm_atomic_get_connector_state);
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/**
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* drm_atomic_set_crtc_for_plane - set crtc for plane
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* @plane_state: atomic state object for the plane
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* @crtc: crtc to use for the plane
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*
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* Changing the assigned crtc for a plane requires us to grab the lock and state
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* for the new crtc, as needed. This function takes care of all these details
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* besides updating the pointer in the state object itself.
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*
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* Returns:
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* 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
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* then the w/w mutex code has detected a deadlock and the entire atomic
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* sequence must be restarted. All other errors are fatal.
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*/
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int
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drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
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struct drm_crtc *crtc)
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{
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struct drm_crtc_state *crtc_state;
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if (crtc) {
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crtc_state = drm_atomic_get_crtc_state(plane_state->state,
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crtc);
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if (IS_ERR(crtc_state))
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return PTR_ERR(crtc_state);
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}
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plane_state->crtc = crtc;
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if (crtc)
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DRM_DEBUG_KMS("Link plane state %p to [CRTC:%d]\n",
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plane_state, crtc->base.id);
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else
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DRM_DEBUG_KMS("Link plane state %p to [NOCRTC]\n", plane_state);
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return 0;
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}
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EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
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/**
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* drm_atomic_set_fb_for_plane - set crtc for plane
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* @plane_state: atomic state object for the plane
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* @fb: fb to use for the plane
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*
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* Changing the assigned framebuffer for a plane requires us to grab a reference
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* to the new fb and drop the reference to the old fb, if there is one. This
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* function takes care of all these details besides updating the pointer in the
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* state object itself.
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*/
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void
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drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
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struct drm_framebuffer *fb)
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{
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if (plane_state->fb)
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drm_framebuffer_unreference(plane_state->fb);
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if (fb)
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drm_framebuffer_reference(fb);
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plane_state->fb = fb;
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if (fb)
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DRM_DEBUG_KMS("Set [FB:%d] for plane state %p\n",
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fb->base.id, plane_state);
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else
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DRM_DEBUG_KMS("Set [NOFB] for plane state %p\n", plane_state);
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}
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EXPORT_SYMBOL(drm_atomic_set_fb_for_plane);
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/**
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* drm_atomic_set_crtc_for_connector - set crtc for connector
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* @conn_state: atomic state object for the connector
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* @crtc: crtc to use for the connector
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*
|
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* Changing the assigned crtc for a connector requires us to grab the lock and
|
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* state for the new crtc, as needed. This function takes care of all these
|
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* details besides updating the pointer in the state object itself.
|
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*
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* Returns:
|
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* 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
|
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* then the w/w mutex code has detected a deadlock and the entire atomic
|
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* sequence must be restarted. All other errors are fatal.
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*/
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int
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drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
|
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struct drm_crtc *crtc)
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{
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struct drm_crtc_state *crtc_state;
|
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|
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if (crtc) {
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crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
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if (IS_ERR(crtc_state))
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return PTR_ERR(crtc_state);
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}
|
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|
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conn_state->crtc = crtc;
|
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|
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if (crtc)
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DRM_DEBUG_KMS("Link connector state %p to [CRTC:%d]\n",
|
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conn_state, crtc->base.id);
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else
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DRM_DEBUG_KMS("Link connector state %p to [NOCRTC]\n",
|
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conn_state);
|
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|
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return 0;
|
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}
|
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EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
|
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|
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/**
|
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* drm_atomic_add_affected_connectors - add connectors for crtc
|
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* @state: atomic state
|
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* @crtc: DRM crtc
|
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*
|
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* This function walks the current configuration and adds all connectors
|
|
* currently using @crtc to the atomic configuration @state. Note that this
|
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* function must acquire the connection mutex. This can potentially cause
|
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* unneeded seralization if the update is just for the planes on one crtc. Hence
|
|
* drivers and helpers should only call this when really needed (e.g. when a
|
|
* full modeset needs to happen due to some change).
|
|
*
|
|
* Returns:
|
|
* 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
|
|
* then the w/w mutex code has detected a deadlock and the entire atomic
|
|
* sequence must be restarted. All other errors are fatal.
|
|
*/
|
|
int
|
|
drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
|
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struct drm_crtc *crtc)
|
|
{
|
|
struct drm_mode_config *config = &state->dev->mode_config;
|
|
struct drm_connector *connector;
|
|
struct drm_connector_state *conn_state;
|
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int ret;
|
|
|
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ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
|
|
if (ret)
|
|
return ret;
|
|
|
|
DRM_DEBUG_KMS("Adding all current connectors for [CRTC:%d] to %p\n",
|
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crtc->base.id, state);
|
|
|
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/*
|
|
* Changed connectors are already in @state, so only need to look at the
|
|
* current configuration.
|
|
*/
|
|
list_for_each_entry(connector, &config->connector_list, head) {
|
|
if (connector->state->crtc != crtc)
|
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continue;
|
|
|
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conn_state = drm_atomic_get_connector_state(state, connector);
|
|
if (IS_ERR(conn_state))
|
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return PTR_ERR(conn_state);
|
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}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_atomic_add_affected_connectors);
|
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|
|
/**
|
|
* drm_atomic_connectors_for_crtc - count number of connected outputs
|
|
* @state: atomic state
|
|
* @crtc: DRM crtc
|
|
*
|
|
* This function counts all connectors which will be connected to @crtc
|
|
* according to @state. Useful to recompute the enable state for @crtc.
|
|
*/
|
|
int
|
|
drm_atomic_connectors_for_crtc(struct drm_atomic_state *state,
|
|
struct drm_crtc *crtc)
|
|
{
|
|
int nconnectors = state->dev->mode_config.num_connector;
|
|
int i, num_connected_connectors = 0;
|
|
|
|
for (i = 0; i < nconnectors; i++) {
|
|
struct drm_connector_state *conn_state;
|
|
|
|
conn_state = state->connector_states[i];
|
|
|
|
if (conn_state && conn_state->crtc == crtc)
|
|
num_connected_connectors++;
|
|
}
|
|
|
|
DRM_DEBUG_KMS("State %p has %i connectors for [CRTC:%d]\n",
|
|
state, num_connected_connectors, crtc->base.id);
|
|
|
|
return num_connected_connectors;
|
|
}
|
|
EXPORT_SYMBOL(drm_atomic_connectors_for_crtc);
|
|
|
|
/**
|
|
* drm_atomic_legacy_backoff - locking backoff for legacy ioctls
|
|
* @state: atomic state
|
|
*
|
|
* This function should be used by legacy entry points which don't understand
|
|
* -EDEADLK semantics. For simplicity this one will grab all modeset locks after
|
|
* the slowpath completed.
|
|
*/
|
|
void drm_atomic_legacy_backoff(struct drm_atomic_state *state)
|
|
{
|
|
int ret;
|
|
|
|
retry:
|
|
drm_modeset_backoff(state->acquire_ctx);
|
|
|
|
ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
|
|
state->acquire_ctx);
|
|
if (ret)
|
|
goto retry;
|
|
ret = drm_modeset_lock_all_crtcs(state->dev,
|
|
state->acquire_ctx);
|
|
if (ret)
|
|
goto retry;
|
|
}
|
|
EXPORT_SYMBOL(drm_atomic_legacy_backoff);
|
|
|
|
/**
|
|
* drm_atomic_check_only - check whether a given config would work
|
|
* @state: atomic configuration to check
|
|
*
|
|
* Note that this function can return -EDEADLK if the driver needed to acquire
|
|
* more locks but encountered a deadlock. The caller must then do the usual w/w
|
|
* backoff dance and restart. All other errors are fatal.
|
|
*
|
|
* Returns:
|
|
* 0 on success, negative error code on failure.
|
|
*/
|
|
int drm_atomic_check_only(struct drm_atomic_state *state)
|
|
{
|
|
struct drm_mode_config *config = &state->dev->mode_config;
|
|
|
|
DRM_DEBUG_KMS("checking %p\n", state);
|
|
|
|
if (config->funcs->atomic_check)
|
|
return config->funcs->atomic_check(state->dev, state);
|
|
else
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_atomic_check_only);
|
|
|
|
/**
|
|
* drm_atomic_commit - commit configuration atomically
|
|
* @state: atomic configuration to check
|
|
*
|
|
* Note that this function can return -EDEADLK if the driver needed to acquire
|
|
* more locks but encountered a deadlock. The caller must then do the usual w/w
|
|
* backoff dance and restart. All other errors are fatal.
|
|
*
|
|
* Also note that on successful execution ownership of @state is transferred
|
|
* from the caller of this function to the function itself. The caller must not
|
|
* free or in any other way access @state. If the function fails then the caller
|
|
* must clean up @state itself.
|
|
*
|
|
* Returns:
|
|
* 0 on success, negative error code on failure.
|
|
*/
|
|
int drm_atomic_commit(struct drm_atomic_state *state)
|
|
{
|
|
struct drm_mode_config *config = &state->dev->mode_config;
|
|
int ret;
|
|
|
|
ret = drm_atomic_check_only(state);
|
|
if (ret)
|
|
return ret;
|
|
|
|
DRM_DEBUG_KMS("commiting %p\n", state);
|
|
|
|
return config->funcs->atomic_commit(state->dev, state, false);
|
|
}
|
|
EXPORT_SYMBOL(drm_atomic_commit);
|
|
|
|
/**
|
|
* drm_atomic_async_commit - atomic&async configuration commit
|
|
* @state: atomic configuration to check
|
|
*
|
|
* Note that this function can return -EDEADLK if the driver needed to acquire
|
|
* more locks but encountered a deadlock. The caller must then do the usual w/w
|
|
* backoff dance and restart. All other errors are fatal.
|
|
*
|
|
* Also note that on successful execution ownership of @state is transferred
|
|
* from the caller of this function to the function itself. The caller must not
|
|
* free or in any other way access @state. If the function fails then the caller
|
|
* must clean up @state itself.
|
|
*
|
|
* Returns:
|
|
* 0 on success, negative error code on failure.
|
|
*/
|
|
int drm_atomic_async_commit(struct drm_atomic_state *state)
|
|
{
|
|
struct drm_mode_config *config = &state->dev->mode_config;
|
|
int ret;
|
|
|
|
ret = drm_atomic_check_only(state);
|
|
if (ret)
|
|
return ret;
|
|
|
|
DRM_DEBUG_KMS("commiting %p asynchronously\n", state);
|
|
|
|
return config->funcs->atomic_commit(state->dev, state, true);
|
|
}
|
|
EXPORT_SYMBOL(drm_atomic_async_commit);
|