drm/linux-core/i915_fence.c

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/**************************************************************************
*
* Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., USA
* All Rights Reserved.
*
* 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
*
**************************************************************************/
/*
* Authors: Thomas Hellstr<EFBFBD>m <thomas-at-tungstengraphics-dot-com>
*/
#include "drmP.h"
#include "drm.h"
#include "i915_drm.h"
#include "i915_drv.h"
/*
* Initiate a sync flush if it's not already pending.
*/
static inline void i915_initiate_rwflush(struct drm_i915_private *dev_priv,
struct drm_fence_class_manager *fc)
{
if ((fc->pending_flush & DRM_I915_FENCE_TYPE_RW) &&
!dev_priv->flush_pending) {
dev_priv->flush_sequence = (uint32_t) READ_BREADCRUMB(dev_priv);
dev_priv->flush_flags = fc->pending_flush;
dev_priv->saved_flush_status = READ_HWSP(dev_priv, 0);
I915_WRITE(I915REG_INSTPM, (1 << 5) | (1 << 21));
dev_priv->flush_pending = 1;
fc->pending_flush &= ~DRM_I915_FENCE_TYPE_RW;
}
}
static inline void i915_report_rwflush(struct drm_device *dev,
struct drm_i915_private *dev_priv)
{
if (unlikely(dev_priv->flush_pending)) {
uint32_t flush_flags;
uint32_t i_status;
uint32_t flush_sequence;
i_status = READ_HWSP(dev_priv, 0);
if ((i_status & (1 << 12)) !=
(dev_priv->saved_flush_status & (1 << 12))) {
flush_flags = dev_priv->flush_flags;
flush_sequence = dev_priv->flush_sequence;
dev_priv->flush_pending = 0;
drm_fence_handler(dev, 0, flush_sequence,
flush_flags, 0);
}
}
}
static void i915_fence_flush(struct drm_device *dev,
uint32_t fence_class)
{
struct drm_i915_private *dev_priv =
(struct drm_i915_private *) dev->dev_private;
struct drm_fence_manager *fm = &dev->fm;
struct drm_fence_class_manager *fc = &fm->fence_class[0];
unsigned long irq_flags;
if (unlikely(!dev_priv))
return;
write_lock_irqsave(&fm->lock, irq_flags);
i915_initiate_rwflush(dev_priv, fc);
write_unlock_irqrestore(&fm->lock, irq_flags);
}
static void i915_fence_poll(struct drm_device *dev, uint32_t fence_class,
uint32_t waiting_types)
{
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struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
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struct drm_fence_manager *fm = &dev->fm;
struct drm_fence_class_manager *fc = &fm->fence_class[0];
uint32_t sequence;
if (unlikely(!dev_priv))
return;
/*
* First, report any executed sync flush:
*/
i915_report_rwflush(dev, dev_priv);
/*
* Report A new breadcrumb, and adjust IRQs.
*/
if (waiting_types & DRM_FENCE_TYPE_EXE) {
sequence = READ_BREADCRUMB(dev_priv);
drm_fence_handler(dev, 0, sequence,
DRM_FENCE_TYPE_EXE, 0);
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if (dev_priv->fence_irq_on &&
!(fc->waiting_types & DRM_FENCE_TYPE_EXE)) {
i915_user_irq_off(dev);
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dev_priv->fence_irq_on = 0;
} else if (!dev_priv->fence_irq_on &&
(fc->waiting_types & DRM_FENCE_TYPE_EXE)) {
i915_user_irq_on(dev);
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dev_priv->fence_irq_on = 1;
}
}
/*
* There may be new RW flushes pending. Start them.
*/
i915_initiate_rwflush(dev_priv, fc);
/*
* And possibly, but unlikely, they finish immediately.
*/
i915_report_rwflush(dev, dev_priv);
}
static int i915_fence_emit_sequence(struct drm_device *dev, uint32_t class,
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uint32_t flags, uint32_t *sequence,
uint32_t *native_type)
{
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struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
if (unlikely(!dev_priv))
return -EINVAL;
i915_emit_irq(dev);
*sequence = (uint32_t) dev_priv->counter;
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*native_type = DRM_FENCE_TYPE_EXE;
if (flags & DRM_I915_FENCE_FLAG_FLUSHED)
*native_type |= DRM_I915_FENCE_TYPE_RW;
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return 0;
}
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void i915_fence_handler(struct drm_device *dev)
{
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struct drm_fence_manager *fm = &dev->fm;
struct drm_fence_class_manager *fc = &fm->fence_class[0];
write_lock(&fm->lock);
i915_fence_poll(dev, 0, fc->waiting_types);
write_unlock(&fm->lock);
}
/*
* We need a separate wait function since we need to poll for
* sync flushes.
*/
static int i915_fence_wait(struct drm_fence_object *fence,
int lazy, int interruptible, uint32_t mask)
{
struct drm_device *dev = fence->dev;
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struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
struct drm_fence_manager *fm = &dev->fm;
struct drm_fence_class_manager *fc = &fm->fence_class[0];
int ret;
unsigned long _end = jiffies + 3 * DRM_HZ;
drm_fence_object_flush(fence, mask);
if (likely(interruptible))
ret = wait_event_interruptible_timeout
(fc->fence_queue, drm_fence_object_signaled(fence, DRM_FENCE_TYPE_EXE),
3 * DRM_HZ);
else
ret = wait_event_timeout
(fc->fence_queue, drm_fence_object_signaled(fence, DRM_FENCE_TYPE_EXE),
3 * DRM_HZ);
if (unlikely(ret == -ERESTARTSYS))
return -EAGAIN;
if (unlikely(ret == 0))
return -EBUSY;
if (likely(mask == DRM_FENCE_TYPE_EXE ||
drm_fence_object_signaled(fence, mask)))
return 0;
/*
* Remove this code snippet when fixed. HWSTAM doesn't let
* flush info through...
*/
if (unlikely(dev_priv && !dev_priv->irq_enabled)) {
unsigned long irq_flags;
DRM_ERROR("X server disabled IRQs before releasing frame buffer.\n");
msleep(100);
dev_priv->flush_pending = 0;
write_lock_irqsave(&fm->lock, irq_flags);
drm_fence_handler(dev, fence->fence_class,
fence->sequence, fence->type, 0);
write_unlock_irqrestore(&fm->lock, irq_flags);
}
/*
* Poll for sync flush completion.
*/
return drm_fence_wait_polling(fence, lazy, interruptible, mask, _end);
}
static uint32_t i915_fence_needed_flush(struct drm_fence_object *fence)
{
uint32_t flush_flags = fence->waiting_types &
~(DRM_FENCE_TYPE_EXE | fence->signaled_types);
if (likely(flush_flags == 0 ||
((flush_flags & ~fence->native_types) == 0) ||
(fence->signaled_types != DRM_FENCE_TYPE_EXE)))
return 0;
else {
struct drm_device *dev = fence->dev;
struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
struct drm_fence_driver *driver = dev->driver->fence_driver;
if (unlikely(!dev_priv))
return 0;
if (dev_priv->flush_pending) {
uint32_t diff = (dev_priv->flush_sequence - fence->sequence) &
driver->sequence_mask;
if (diff < driver->wrap_diff)
return 0;
}
}
return flush_flags;
}
struct drm_fence_driver i915_fence_driver = {
.num_classes = 1,
.wrap_diff = (1U << (BREADCRUMB_BITS - 1)),
.flush_diff = (1U << (BREADCRUMB_BITS - 2)),
.sequence_mask = BREADCRUMB_MASK,
.has_irq = NULL,
.emit = i915_fence_emit_sequence,
.flush = i915_fence_flush,
.poll = i915_fence_poll,
.needed_flush = i915_fence_needed_flush,
.wait = i915_fence_wait,
};