244 lines
8.8 KiB
C
244 lines
8.8 KiB
C
/*
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* Copyright © 2014 Intel Corporation
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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
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Daniel Vetter <daniel.vetter@ffwll.ch>
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*/
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/**
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* DOC: frontbuffer tracking
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*
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* Many features require us to track changes to the currently active
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* frontbuffer, especially rendering targeted at the frontbuffer.
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*
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* To be able to do so GEM tracks frontbuffers using a bitmask for all possible
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* frontbuffer slots through i915_gem_track_fb(). The function in this file are
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* then called when the contents of the frontbuffer are invalidated, when
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* frontbuffer rendering has stopped again to flush out all the changes and when
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* the frontbuffer is exchanged with a flip. Subsystems interested in
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* frontbuffer changes (e.g. PSR, FBC, DRRS) should directly put their callbacks
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* into the relevant places and filter for the frontbuffer slots that they are
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* interested int.
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*
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* On a high level there are two types of powersaving features. The first one
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* work like a special cache (FBC and PSR) and are interested when they should
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* stop caching and when to restart caching. This is done by placing callbacks
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* into the invalidate and the flush functions: At invalidate the caching must
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* be stopped and at flush time it can be restarted. And maybe they need to know
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* when the frontbuffer changes (e.g. when the hw doesn't initiate an invalidate
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* and flush on its own) which can be achieved with placing callbacks into the
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* flip functions.
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*
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* The other type of display power saving feature only cares about busyness
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* (e.g. DRRS). In that case all three (invalidate, flush and flip) indicate
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* busyness. There is no direct way to detect idleness. Instead an idle timer
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* work delayed work should be started from the flush and flip functions and
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* cancelled as soon as busyness is detected.
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*
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* Note that there's also an older frontbuffer activity tracking scheme which
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* just tracks general activity. This is done by the various mark_busy and
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* mark_idle functions. For display power management features using these
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* functions is deprecated and should be avoided.
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*/
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#include <drm/drmP.h>
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#include "intel_drv.h"
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#include "i915_drv.h"
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/**
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* intel_fb_obj_invalidate - invalidate frontbuffer object
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* @obj: GEM object to invalidate
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* @origin: which operation caused the invalidation
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*
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* This function gets called every time rendering on the given object starts and
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* frontbuffer caching (fbc, low refresh rate for DRRS, panel self refresh) must
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* be invalidated. For ORIGIN_CS any subsequent invalidation will be delayed
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* until the rendering completes or a flip on this frontbuffer plane is
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* scheduled.
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*/
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void intel_fb_obj_invalidate(struct drm_i915_gem_object *obj,
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enum fb_op_origin origin)
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{
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struct drm_device *dev = obj->base.dev;
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struct drm_i915_private *dev_priv = to_i915(dev);
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WARN_ON(!mutex_is_locked(&dev->struct_mutex));
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if (!obj->frontbuffer_bits)
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return;
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if (origin == ORIGIN_CS) {
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mutex_lock(&dev_priv->fb_tracking.lock);
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dev_priv->fb_tracking.busy_bits
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|= obj->frontbuffer_bits;
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dev_priv->fb_tracking.flip_bits
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&= ~obj->frontbuffer_bits;
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mutex_unlock(&dev_priv->fb_tracking.lock);
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}
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intel_psr_invalidate(dev, obj->frontbuffer_bits);
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intel_edp_drrs_invalidate(dev, obj->frontbuffer_bits);
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intel_fbc_invalidate(dev_priv, obj->frontbuffer_bits, origin);
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}
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/**
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* intel_frontbuffer_flush - flush frontbuffer
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* @dev: DRM device
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* @frontbuffer_bits: frontbuffer plane tracking bits
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* @origin: which operation caused the flush
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*
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* This function gets called every time rendering on the given planes has
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* completed and frontbuffer caching can be started again. Flushes will get
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* delayed if they're blocked by some outstanding asynchronous rendering.
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*
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* Can be called without any locks held.
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*/
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static void intel_frontbuffer_flush(struct drm_device *dev,
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unsigned frontbuffer_bits,
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enum fb_op_origin origin)
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{
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struct drm_i915_private *dev_priv = to_i915(dev);
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/* Delay flushing when rings are still busy.*/
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mutex_lock(&dev_priv->fb_tracking.lock);
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frontbuffer_bits &= ~dev_priv->fb_tracking.busy_bits;
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mutex_unlock(&dev_priv->fb_tracking.lock);
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if (!frontbuffer_bits)
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return;
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intel_edp_drrs_flush(dev, frontbuffer_bits);
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intel_psr_flush(dev, frontbuffer_bits, origin);
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intel_fbc_flush(dev_priv, frontbuffer_bits, origin);
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}
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/**
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* intel_fb_obj_flush - flush frontbuffer object
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* @obj: GEM object to flush
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* @retire: set when retiring asynchronous rendering
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* @origin: which operation caused the flush
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*
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* This function gets called every time rendering on the given object has
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* completed and frontbuffer caching can be started again. If @retire is true
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* then any delayed flushes will be unblocked.
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*/
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void intel_fb_obj_flush(struct drm_i915_gem_object *obj,
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bool retire, enum fb_op_origin origin)
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{
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struct drm_device *dev = obj->base.dev;
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struct drm_i915_private *dev_priv = to_i915(dev);
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unsigned frontbuffer_bits;
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WARN_ON(!mutex_is_locked(&dev->struct_mutex));
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if (!obj->frontbuffer_bits)
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return;
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frontbuffer_bits = obj->frontbuffer_bits;
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if (retire) {
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mutex_lock(&dev_priv->fb_tracking.lock);
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/* Filter out new bits since rendering started. */
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frontbuffer_bits &= dev_priv->fb_tracking.busy_bits;
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dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits;
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mutex_unlock(&dev_priv->fb_tracking.lock);
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}
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intel_frontbuffer_flush(dev, frontbuffer_bits, origin);
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}
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/**
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* intel_frontbuffer_flip_prepare - prepare asynchronous frontbuffer flip
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* @dev: DRM device
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* @frontbuffer_bits: frontbuffer plane tracking bits
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*
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* This function gets called after scheduling a flip on @obj. The actual
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* frontbuffer flushing will be delayed until completion is signalled with
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* intel_frontbuffer_flip_complete. If an invalidate happens in between this
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* flush will be cancelled.
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*
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* Can be called without any locks held.
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*/
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void intel_frontbuffer_flip_prepare(struct drm_device *dev,
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unsigned frontbuffer_bits)
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{
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struct drm_i915_private *dev_priv = to_i915(dev);
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mutex_lock(&dev_priv->fb_tracking.lock);
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dev_priv->fb_tracking.flip_bits |= frontbuffer_bits;
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/* Remove stale busy bits due to the old buffer. */
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dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits;
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mutex_unlock(&dev_priv->fb_tracking.lock);
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intel_psr_single_frame_update(dev, frontbuffer_bits);
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}
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/**
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* intel_frontbuffer_flip_complete - complete asynchronous frontbuffer flip
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* @dev: DRM device
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* @frontbuffer_bits: frontbuffer plane tracking bits
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*
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* This function gets called after the flip has been latched and will complete
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* on the next vblank. It will execute the flush if it hasn't been cancelled yet.
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*
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* Can be called without any locks held.
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*/
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void intel_frontbuffer_flip_complete(struct drm_device *dev,
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unsigned frontbuffer_bits)
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{
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struct drm_i915_private *dev_priv = to_i915(dev);
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mutex_lock(&dev_priv->fb_tracking.lock);
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/* Mask any cancelled flips. */
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frontbuffer_bits &= dev_priv->fb_tracking.flip_bits;
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dev_priv->fb_tracking.flip_bits &= ~frontbuffer_bits;
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mutex_unlock(&dev_priv->fb_tracking.lock);
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intel_frontbuffer_flush(dev, frontbuffer_bits, ORIGIN_FLIP);
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}
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/**
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* intel_frontbuffer_flip - synchronous frontbuffer flip
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* @dev: DRM device
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* @frontbuffer_bits: frontbuffer plane tracking bits
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*
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* This function gets called after scheduling a flip on @obj. This is for
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* synchronous plane updates which will happen on the next vblank and which will
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* not get delayed by pending gpu rendering.
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*
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* Can be called without any locks held.
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*/
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void intel_frontbuffer_flip(struct drm_device *dev,
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unsigned frontbuffer_bits)
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{
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struct drm_i915_private *dev_priv = to_i915(dev);
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mutex_lock(&dev_priv->fb_tracking.lock);
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/* Remove stale busy bits due to the old buffer. */
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dev_priv->fb_tracking.busy_bits &= ~frontbuffer_bits;
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mutex_unlock(&dev_priv->fb_tracking.lock);
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intel_frontbuffer_flush(dev, frontbuffer_bits, ORIGIN_FLIP);
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}
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