329 lines
11 KiB
C
329 lines
11 KiB
C
|
/*
|
||
|
|
* 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(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 = to_i915(front->obj->base.dev);
|
||
|
|
|
||
|
|
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(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 = to_i915(front->obj->base.dev);
|
||
|
|
|
||
|
|
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(&to_i915(front->obj->base.dev)->display.fb_tracking.lock)
|
||
|
|
{
|
||
|
|
struct intel_frontbuffer *front =
|
||
|
|
container_of(ref, typeof(*front), ref);
|
||
|
|
struct drm_i915_gem_object *obj = front->obj;
|
||
|
|
struct i915_vma *vma;
|
||
|
|
|
||
|
|
drm_WARN_ON(obj->base.dev, atomic_read(&front->bits));
|
||
|
|
|
||
|
|
spin_lock(&obj->vma.lock);
|
||
|
|
for_each_ggtt_vma(vma, obj) {
|
||
|
|
i915_vma_clear_scanout(vma);
|
||
|
|
vma->display_alignment = I915_GTT_MIN_ALIGNMENT;
|
||
|
|
}
|
||
|
|
spin_unlock(&obj->vma.lock);
|
||
|
|
|
||
|
|
RCU_INIT_POINTER(obj->frontbuffer, NULL);
|
||
|
|
spin_unlock(&to_i915(obj->base.dev)->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 = to_i915(obj->base.dev);
|
||
|
|
struct intel_frontbuffer *front;
|
||
|
|
|
||
|
|
front = __intel_frontbuffer_get(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);
|
||
|
|
if (rcu_access_pointer(obj->frontbuffer)) {
|
||
|
|
kfree(front);
|
||
|
|
front = rcu_dereference_protected(obj->frontbuffer, true);
|
||
|
|
kref_get(&front->ref);
|
||
|
|
} else {
|
||
|
|
i915_gem_object_get(obj);
|
||
|
|
rcu_assign_pointer(obj->frontbuffer, front);
|
||
|
|
}
|
||
|
|
spin_unlock(&i915->display.fb_tracking.lock);
|
||
|
|
|
||
|
|
return front;
|
||
|
|
}
|
||
|
|
|
||
|
|
void intel_frontbuffer_put(struct intel_frontbuffer *front)
|
||
|
|
{
|
||
|
|
kref_put_lock(&front->ref,
|
||
|
|
frontbuffer_release,
|
||
|
|
&to_i915(front->obj->base.dev)->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(old->obj->base.dev,
|
||
|
|
!(atomic_read(&old->bits) & frontbuffer_bits));
|
||
|
|
atomic_andnot(frontbuffer_bits, &old->bits);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (new) {
|
||
|
|
drm_WARN_ON(new->obj->base.dev,
|
||
|
|
atomic_read(&new->bits) & frontbuffer_bits);
|
||
|
|
atomic_or(frontbuffer_bits, &new->bits);
|
||
|
|
}
|
||
|
|
}
|