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![Sean Paul](/assets/img/avatar_default.png)
Since the dirtyfb ioctl doesn't give us any hints as to which plane is
scanning out the fb it's marking as damaged, we need to loop through
planes to find it.
Currently we just reach into plane state and check, but that can race
with another commit changing the fb out from under us. This patch locks
the plane before checking the fb and will release the lock if the plane
is not displaying the dirty fb.
Fixes: b9fc5e01d1
("drm: Add helper to implement legacy dirtyfb")
Cc: Rob Clark <robdclark@gmail.com>
Cc: Deepak Rawat <drawat@vmware.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v5.0+
Reported-by: Daniel Vetter <daniel@ffwll.ch>
Reviewed-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190904202938.110207-1-sean@poorly.run
383 lines
13 KiB
C
383 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR MIT
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/**************************************************************************
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*
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* Copyright (c) 2018 VMware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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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
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* 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 NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Deepak Rawat <drawat@vmware.com>
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* Rob Clark <robdclark@gmail.com>
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*
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**************************************************************************/
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#include <drm/drm_atomic.h>
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#include <drm/drm_damage_helper.h>
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#include <drm/drm_device.h>
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/**
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* DOC: overview
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*
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* FB_DAMAGE_CLIPS is an optional plane property which provides a means to
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* specify a list of damage rectangles on a plane in framebuffer coordinates of
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* the framebuffer attached to the plane. In current context damage is the area
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* of plane framebuffer that has changed since last plane update (also called
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* page-flip), irrespective of whether currently attached framebuffer is same as
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* framebuffer attached during last plane update or not.
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*
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* FB_DAMAGE_CLIPS is a hint to kernel which could be helpful for some drivers
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* to optimize internally especially for virtual devices where each framebuffer
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* change needs to be transmitted over network, usb, etc.
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*
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* Since FB_DAMAGE_CLIPS is a hint so it is an optional property. User-space can
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* ignore damage clips property and in that case driver will do a full plane
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* update. In case damage clips are provided then it is guaranteed that the area
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* inside damage clips will be updated to plane. For efficiency driver can do
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* full update or can update more than specified in damage clips. Since driver
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* is free to read more, user-space must always render the entire visible
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* framebuffer. Otherwise there can be corruptions. Also, if a user-space
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* provides damage clips which doesn't encompass the actual damage to
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* framebuffer (since last plane update) can result in incorrect rendering.
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*
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* FB_DAMAGE_CLIPS is a blob property with the layout of blob data is simply an
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* array of &drm_mode_rect. Unlike plane &drm_plane_state.src coordinates,
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* damage clips are not in 16.16 fixed point. Similar to plane src in
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* framebuffer, damage clips cannot be negative. In damage clip, x1/y1 are
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* inclusive and x2/y2 are exclusive. While kernel does not error for overlapped
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* damage clips, it is strongly discouraged.
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*
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* Drivers that are interested in damage interface for plane should enable
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* FB_DAMAGE_CLIPS property by calling drm_plane_enable_fb_damage_clips().
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* Drivers implementing damage can use drm_atomic_helper_damage_iter_init() and
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* drm_atomic_helper_damage_iter_next() helper iterator function to get damage
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* rectangles clipped to &drm_plane_state.src.
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*/
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static void convert_clip_rect_to_rect(const struct drm_clip_rect *src,
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struct drm_mode_rect *dest,
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uint32_t num_clips, uint32_t src_inc)
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{
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while (num_clips > 0) {
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dest->x1 = src->x1;
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dest->y1 = src->y1;
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dest->x2 = src->x2;
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dest->y2 = src->y2;
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src += src_inc;
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dest++;
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num_clips--;
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}
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}
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/**
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* drm_plane_enable_fb_damage_clips - Enables plane fb damage clips property.
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* @plane: Plane on which to enable damage clips property.
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*
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* This function lets driver to enable the damage clips property on a plane.
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*/
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void drm_plane_enable_fb_damage_clips(struct drm_plane *plane)
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{
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struct drm_device *dev = plane->dev;
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struct drm_mode_config *config = &dev->mode_config;
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drm_object_attach_property(&plane->base, config->prop_fb_damage_clips,
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0);
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}
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EXPORT_SYMBOL(drm_plane_enable_fb_damage_clips);
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/**
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* drm_atomic_helper_check_plane_damage - Verify plane damage on atomic_check.
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* @state: The driver state object.
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* @plane_state: Plane state for which to verify damage.
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*
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* This helper function makes sure that damage from plane state is discarded
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* for full modeset. If there are more reasons a driver would want to do a full
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* plane update rather than processing individual damage regions, then those
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* cases should be taken care of here.
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*
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* Note that &drm_plane_state.fb_damage_clips == NULL in plane state means that
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* full plane update should happen. It also ensure helper iterator will return
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* &drm_plane_state.src as damage.
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*/
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void drm_atomic_helper_check_plane_damage(struct drm_atomic_state *state,
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struct drm_plane_state *plane_state)
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{
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struct drm_crtc_state *crtc_state;
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if (plane_state->crtc) {
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crtc_state = drm_atomic_get_new_crtc_state(state,
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plane_state->crtc);
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if (WARN_ON(!crtc_state))
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return;
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if (drm_atomic_crtc_needs_modeset(crtc_state)) {
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drm_property_blob_put(plane_state->fb_damage_clips);
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plane_state->fb_damage_clips = NULL;
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}
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}
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}
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EXPORT_SYMBOL(drm_atomic_helper_check_plane_damage);
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/**
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* drm_atomic_helper_dirtyfb - Helper for dirtyfb.
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* @fb: DRM framebuffer.
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* @file_priv: Drm file for the ioctl call.
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* @flags: Dirty fb annotate flags.
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* @color: Color for annotate fill.
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* @clips: Dirty region.
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* @num_clips: Count of clip in clips.
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*
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* A helper to implement &drm_framebuffer_funcs.dirty using damage interface
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* during plane update. If num_clips is 0 then this helper will do a full plane
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* update. This is the same behaviour expected by DIRTFB IOCTL.
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*
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* Note that this helper is blocking implementation. This is what current
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* drivers and userspace expect in their DIRTYFB IOCTL implementation, as a way
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* to rate-limit userspace and make sure its rendering doesn't get ahead of
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* uploading new data too much.
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*
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* Return: Zero on success, negative errno on failure.
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*/
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int drm_atomic_helper_dirtyfb(struct drm_framebuffer *fb,
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struct drm_file *file_priv, unsigned int flags,
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unsigned int color, struct drm_clip_rect *clips,
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unsigned int num_clips)
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{
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struct drm_modeset_acquire_ctx ctx;
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struct drm_property_blob *damage = NULL;
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struct drm_mode_rect *rects = NULL;
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struct drm_atomic_state *state;
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struct drm_plane *plane;
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int ret = 0;
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/*
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* When called from ioctl, we are interruptable, but not when called
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* internally (ie. defio worker)
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*/
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drm_modeset_acquire_init(&ctx,
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file_priv ? DRM_MODESET_ACQUIRE_INTERRUPTIBLE : 0);
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state = drm_atomic_state_alloc(fb->dev);
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if (!state) {
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ret = -ENOMEM;
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goto out_drop_locks;
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}
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state->acquire_ctx = &ctx;
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if (clips) {
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uint32_t inc = 1;
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if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY) {
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inc = 2;
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num_clips /= 2;
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}
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rects = kcalloc(num_clips, sizeof(*rects), GFP_KERNEL);
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if (!rects) {
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ret = -ENOMEM;
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goto out;
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}
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convert_clip_rect_to_rect(clips, rects, num_clips, inc);
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damage = drm_property_create_blob(fb->dev,
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num_clips * sizeof(*rects),
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rects);
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if (IS_ERR(damage)) {
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ret = PTR_ERR(damage);
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damage = NULL;
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goto out;
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}
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}
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retry:
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drm_for_each_plane(plane, fb->dev) {
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struct drm_plane_state *plane_state;
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ret = drm_modeset_lock(&plane->mutex, state->acquire_ctx);
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if (ret)
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goto out;
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if (plane->state->fb != fb) {
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drm_modeset_unlock(&plane->mutex);
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continue;
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}
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plane_state = drm_atomic_get_plane_state(state, plane);
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if (IS_ERR(plane_state)) {
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ret = PTR_ERR(plane_state);
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goto out;
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}
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drm_property_replace_blob(&plane_state->fb_damage_clips,
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damage);
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}
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ret = drm_atomic_commit(state);
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out:
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if (ret == -EDEADLK) {
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drm_atomic_state_clear(state);
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ret = drm_modeset_backoff(&ctx);
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if (!ret)
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goto retry;
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}
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drm_property_blob_put(damage);
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kfree(rects);
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drm_atomic_state_put(state);
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out_drop_locks:
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drm_modeset_drop_locks(&ctx);
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drm_modeset_acquire_fini(&ctx);
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return ret;
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}
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EXPORT_SYMBOL(drm_atomic_helper_dirtyfb);
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/**
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* drm_atomic_helper_damage_iter_init - Initialize the damage iterator.
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* @iter: The iterator to initialize.
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* @old_state: Old plane state for validation.
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* @state: Plane state from which to iterate the damage clips.
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*
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* Initialize an iterator, which clips plane damage
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* &drm_plane_state.fb_damage_clips to plane &drm_plane_state.src. This iterator
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* returns full plane src in case damage is not present because either
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* user-space didn't sent or driver discarded it (it want to do full plane
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* update). Currently this iterator returns full plane src in case plane src
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* changed but that can be changed in future to return damage.
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*
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* For the case when plane is not visible or plane update should not happen the
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* first call to iter_next will return false. Note that this helper use clipped
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* &drm_plane_state.src, so driver calling this helper should have called
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* drm_atomic_helper_check_plane_state() earlier.
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*/
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void
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drm_atomic_helper_damage_iter_init(struct drm_atomic_helper_damage_iter *iter,
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const struct drm_plane_state *old_state,
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const struct drm_plane_state *state)
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{
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memset(iter, 0, sizeof(*iter));
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if (!state || !state->crtc || !state->fb || !state->visible)
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return;
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iter->clips = drm_helper_get_plane_damage_clips(state);
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iter->num_clips = drm_plane_get_damage_clips_count(state);
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/* Round down for x1/y1 and round up for x2/y2 to catch all pixels */
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iter->plane_src.x1 = state->src.x1 >> 16;
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iter->plane_src.y1 = state->src.y1 >> 16;
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iter->plane_src.x2 = (state->src.x2 >> 16) + !!(state->src.x2 & 0xFFFF);
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iter->plane_src.y2 = (state->src.y2 >> 16) + !!(state->src.y2 & 0xFFFF);
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if (!iter->clips || !drm_rect_equals(&state->src, &old_state->src)) {
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iter->clips = NULL;
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iter->num_clips = 0;
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iter->full_update = true;
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}
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}
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EXPORT_SYMBOL(drm_atomic_helper_damage_iter_init);
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/**
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* drm_atomic_helper_damage_iter_next - Advance the damage iterator.
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* @iter: The iterator to advance.
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* @rect: Return a rectangle in fb coordinate clipped to plane src.
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*
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* Since plane src is in 16.16 fixed point and damage clips are whole number,
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* this iterator round off clips that intersect with plane src. Round down for
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* x1/y1 and round up for x2/y2 for the intersected coordinate. Similar rounding
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* off for full plane src, in case it's returned as damage. This iterator will
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* skip damage clips outside of plane src.
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*
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* Return: True if the output is valid, false if reached the end.
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*
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* If the first call to iterator next returns false then it means no need to
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* update the plane.
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*/
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bool
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drm_atomic_helper_damage_iter_next(struct drm_atomic_helper_damage_iter *iter,
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struct drm_rect *rect)
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{
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bool ret = false;
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if (iter->full_update) {
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*rect = iter->plane_src;
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iter->full_update = false;
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return true;
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}
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while (iter->curr_clip < iter->num_clips) {
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*rect = iter->clips[iter->curr_clip];
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iter->curr_clip++;
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if (drm_rect_intersect(rect, &iter->plane_src)) {
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ret = true;
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break;
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}
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}
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return ret;
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}
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EXPORT_SYMBOL(drm_atomic_helper_damage_iter_next);
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/**
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* drm_atomic_helper_damage_merged - Merged plane damage
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* @old_state: Old plane state for validation.
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* @state: Plane state from which to iterate the damage clips.
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* @rect: Returns the merged damage rectangle
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*
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* This function merges any valid plane damage clips into one rectangle and
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* returns it in @rect.
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*
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* For details see: drm_atomic_helper_damage_iter_init() and
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* drm_atomic_helper_damage_iter_next().
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*
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* Returns:
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* True if there is valid plane damage otherwise false.
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*/
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bool drm_atomic_helper_damage_merged(const struct drm_plane_state *old_state,
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struct drm_plane_state *state,
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struct drm_rect *rect)
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{
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struct drm_atomic_helper_damage_iter iter;
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struct drm_rect clip;
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bool valid = false;
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rect->x1 = INT_MAX;
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rect->y1 = INT_MAX;
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rect->x2 = 0;
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rect->y2 = 0;
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drm_atomic_helper_damage_iter_init(&iter, old_state, state);
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drm_atomic_for_each_plane_damage(&iter, &clip) {
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rect->x1 = min(rect->x1, clip.x1);
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rect->y1 = min(rect->y1, clip.y1);
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rect->x2 = max(rect->x2, clip.x2);
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rect->y2 = max(rect->y2, clip.y2);
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valid = true;
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}
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return valid;
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}
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EXPORT_SYMBOL(drm_atomic_helper_damage_merged);
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