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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/gpu/drm/i915/display/intel_frontbuffer.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_frontbuffer.c')
-rw-r--r-- | drivers/gpu/drm/i915/display/intel_frontbuffer.c | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_frontbuffer.c b/drivers/gpu/drm/i915/display/intel_frontbuffer.c new file mode 100644 index 000000000..22392f94b --- /dev/null +++ b/drivers/gpu/drm/i915/display/intel_frontbuffer.c @@ -0,0 +1,316 @@ +/* + * Copyright © 2014 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + * + * Authors: + * Daniel Vetter <daniel.vetter@ffwll.ch> + */ + +/** + * DOC: frontbuffer tracking + * + * Many features require us to track changes to the currently active + * frontbuffer, especially rendering targeted at the frontbuffer. + * + * To be able to do so we track frontbuffers using a bitmask for all possible + * frontbuffer slots through intel_frontbuffer_track(). The functions in this + * file are then called when the contents of the frontbuffer are invalidated, + * when frontbuffer rendering has stopped again to flush out all the changes + * and when the frontbuffer is exchanged with a flip. Subsystems interested in + * frontbuffer changes (e.g. PSR, FBC, DRRS) should directly put their callbacks + * into the relevant places and filter for the frontbuffer slots that they are + * interested int. + * + * On a high level there are two types of powersaving features. The first one + * work like a special cache (FBC and PSR) and are interested when they should + * stop caching and when to restart caching. This is done by placing callbacks + * into the invalidate and the flush functions: At invalidate the caching must + * be stopped and at flush time it can be restarted. And maybe they need to know + * when the frontbuffer changes (e.g. when the hw doesn't initiate an invalidate + * and flush on its own) which can be achieved with placing callbacks into the + * flip functions. + * + * The other type of display power saving feature only cares about busyness + * (e.g. DRRS). In that case all three (invalidate, flush and flip) indicate + * busyness. There is no direct way to detect idleness. Instead an idle timer + * work delayed work should be started from the flush and flip functions and + * cancelled as soon as busyness is detected. + */ + +#include "i915_drv.h" +#include "intel_display_trace.h" +#include "intel_display_types.h" +#include "intel_dp.h" +#include "intel_drrs.h" +#include "intel_fbc.h" +#include "intel_frontbuffer.h" +#include "intel_psr.h" + +/** + * frontbuffer_flush - flush frontbuffer + * @i915: i915 device + * @frontbuffer_bits: frontbuffer plane tracking bits + * @origin: which operation caused the flush + * + * This function gets called every time rendering on the given planes has + * completed and frontbuffer caching can be started again. Flushes will get + * delayed if they're blocked by some outstanding asynchronous rendering. + * + * Can be called without any locks held. + */ +static void frontbuffer_flush(struct drm_i915_private *i915, + unsigned int frontbuffer_bits, + enum fb_op_origin origin) +{ + /* Delay flushing when rings are still busy.*/ + spin_lock(&i915->display.fb_tracking.lock); + frontbuffer_bits &= ~i915->display.fb_tracking.busy_bits; + spin_unlock(&i915->display.fb_tracking.lock); + + if (!frontbuffer_bits) + return; + + trace_intel_frontbuffer_flush(i915, frontbuffer_bits, origin); + + might_sleep(); + intel_drrs_flush(i915, frontbuffer_bits); + intel_psr_flush(i915, frontbuffer_bits, origin); + intel_fbc_flush(i915, frontbuffer_bits, origin); +} + +/** + * intel_frontbuffer_flip_prepare - prepare asynchronous frontbuffer flip + * @i915: i915 device + * @frontbuffer_bits: frontbuffer plane tracking bits + * + * This function gets called after scheduling a flip on @obj. The actual + * frontbuffer flushing will be delayed until completion is signalled with + * intel_frontbuffer_flip_complete. If an invalidate happens in between this + * flush will be cancelled. + * + * Can be called without any locks held. + */ +void intel_frontbuffer_flip_prepare(struct drm_i915_private *i915, + unsigned frontbuffer_bits) +{ + spin_lock(&i915->display.fb_tracking.lock); + i915->display.fb_tracking.flip_bits |= frontbuffer_bits; + /* Remove stale busy bits due to the old buffer. */ + i915->display.fb_tracking.busy_bits &= ~frontbuffer_bits; + spin_unlock(&i915->display.fb_tracking.lock); +} + +/** + * intel_frontbuffer_flip_complete - complete asynchronous frontbuffer flip + * @i915: i915 device + * @frontbuffer_bits: frontbuffer plane tracking bits + * + * This function gets called after the flip has been latched and will complete + * on the next vblank. It will execute the flush if it hasn't been cancelled yet. + * + * Can be called without any locks held. + */ +void intel_frontbuffer_flip_complete(struct drm_i915_private *i915, + unsigned frontbuffer_bits) +{ + spin_lock(&i915->display.fb_tracking.lock); + /* Mask any cancelled flips. */ + frontbuffer_bits &= i915->display.fb_tracking.flip_bits; + i915->display.fb_tracking.flip_bits &= ~frontbuffer_bits; + spin_unlock(&i915->display.fb_tracking.lock); + + if (frontbuffer_bits) + frontbuffer_flush(i915, frontbuffer_bits, ORIGIN_FLIP); +} + +/** + * intel_frontbuffer_flip - synchronous frontbuffer flip + * @i915: i915 device + * @frontbuffer_bits: frontbuffer plane tracking bits + * + * This function gets called after scheduling a flip on @obj. This is for + * synchronous plane updates which will happen on the next vblank and which will + * not get delayed by pending gpu rendering. + * + * Can be called without any locks held. + */ +void intel_frontbuffer_flip(struct drm_i915_private *i915, + unsigned frontbuffer_bits) +{ + spin_lock(&i915->display.fb_tracking.lock); + /* Remove stale busy bits due to the old buffer. */ + i915->display.fb_tracking.busy_bits &= ~frontbuffer_bits; + spin_unlock(&i915->display.fb_tracking.lock); + + frontbuffer_flush(i915, frontbuffer_bits, ORIGIN_FLIP); +} + +void __intel_fb_invalidate(struct intel_frontbuffer *front, + enum fb_op_origin origin, + unsigned int frontbuffer_bits) +{ + struct drm_i915_private *i915 = intel_bo_to_i915(front->obj); + + if (origin == ORIGIN_CS) { + spin_lock(&i915->display.fb_tracking.lock); + i915->display.fb_tracking.busy_bits |= frontbuffer_bits; + i915->display.fb_tracking.flip_bits &= ~frontbuffer_bits; + spin_unlock(&i915->display.fb_tracking.lock); + } + + trace_intel_frontbuffer_invalidate(i915, frontbuffer_bits, origin); + + might_sleep(); + intel_psr_invalidate(i915, frontbuffer_bits, origin); + intel_drrs_invalidate(i915, frontbuffer_bits); + intel_fbc_invalidate(i915, frontbuffer_bits, origin); +} + +void __intel_fb_flush(struct intel_frontbuffer *front, + enum fb_op_origin origin, + unsigned int frontbuffer_bits) +{ + struct drm_i915_private *i915 = intel_bo_to_i915(front->obj); + + if (origin == ORIGIN_CS) { + spin_lock(&i915->display.fb_tracking.lock); + /* Filter out new bits since rendering started. */ + frontbuffer_bits &= i915->display.fb_tracking.busy_bits; + i915->display.fb_tracking.busy_bits &= ~frontbuffer_bits; + spin_unlock(&i915->display.fb_tracking.lock); + } + + if (frontbuffer_bits) + frontbuffer_flush(i915, frontbuffer_bits, origin); +} + +static int frontbuffer_active(struct i915_active *ref) +{ + struct intel_frontbuffer *front = + container_of(ref, typeof(*front), write); + + kref_get(&front->ref); + return 0; +} + +static void frontbuffer_retire(struct i915_active *ref) +{ + struct intel_frontbuffer *front = + container_of(ref, typeof(*front), write); + + intel_frontbuffer_flush(front, ORIGIN_CS); + intel_frontbuffer_put(front); +} + +static void frontbuffer_release(struct kref *ref) + __releases(&intel_bo_to_i915(front->obj)->display.fb_tracking.lock) +{ + struct intel_frontbuffer *front = + container_of(ref, typeof(*front), ref); + struct drm_i915_gem_object *obj = front->obj; + + drm_WARN_ON(&intel_bo_to_i915(obj)->drm, atomic_read(&front->bits)); + + i915_ggtt_clear_scanout(obj); + + i915_gem_object_set_frontbuffer(obj, NULL); + spin_unlock(&intel_bo_to_i915(obj)->display.fb_tracking.lock); + + i915_active_fini(&front->write); + + i915_gem_object_put(obj); + kfree_rcu(front, rcu); +} + +struct intel_frontbuffer * +intel_frontbuffer_get(struct drm_i915_gem_object *obj) +{ + struct drm_i915_private *i915 = intel_bo_to_i915(obj); + struct intel_frontbuffer *front, *cur; + + front = i915_gem_object_get_frontbuffer(obj); + if (front) + return front; + + front = kmalloc(sizeof(*front), GFP_KERNEL); + if (!front) + return NULL; + + front->obj = obj; + kref_init(&front->ref); + atomic_set(&front->bits, 0); + i915_active_init(&front->write, + frontbuffer_active, + frontbuffer_retire, + I915_ACTIVE_RETIRE_SLEEPS); + + spin_lock(&i915->display.fb_tracking.lock); + cur = i915_gem_object_set_frontbuffer(obj, front); + spin_unlock(&i915->display.fb_tracking.lock); + if (cur != front) + kfree(front); + return cur; +} + +void intel_frontbuffer_put(struct intel_frontbuffer *front) +{ + kref_put_lock(&front->ref, + frontbuffer_release, + &intel_bo_to_i915(front->obj)->display.fb_tracking.lock); +} + +/** + * intel_frontbuffer_track - update frontbuffer tracking + * @old: current buffer for the frontbuffer slots + * @new: new buffer for the frontbuffer slots + * @frontbuffer_bits: bitmask of frontbuffer slots + * + * This updates the frontbuffer tracking bits @frontbuffer_bits by clearing them + * from @old and setting them in @new. Both @old and @new can be NULL. + */ +void intel_frontbuffer_track(struct intel_frontbuffer *old, + struct intel_frontbuffer *new, + unsigned int frontbuffer_bits) +{ + /* + * Control of individual bits within the mask are guarded by + * the owning plane->mutex, i.e. we can never see concurrent + * manipulation of individual bits. But since the bitfield as a whole + * is updated using RMW, we need to use atomics in order to update + * the bits. + */ + BUILD_BUG_ON(INTEL_FRONTBUFFER_BITS_PER_PIPE * I915_MAX_PIPES > + BITS_PER_TYPE(atomic_t)); + BUILD_BUG_ON(INTEL_FRONTBUFFER_BITS_PER_PIPE * I915_MAX_PIPES > 32); + BUILD_BUG_ON(I915_MAX_PLANES > INTEL_FRONTBUFFER_BITS_PER_PIPE); + + if (old) { + drm_WARN_ON(&intel_bo_to_i915(old->obj)->drm, + !(atomic_read(&old->bits) & frontbuffer_bits)); + atomic_andnot(frontbuffer_bits, &old->bits); + } + + if (new) { + drm_WARN_ON(&intel_bo_to_i915(new->obj)->drm, + atomic_read(&new->bits) & frontbuffer_bits); + atomic_or(frontbuffer_bits, &new->bits); + } +} |