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/* $OpenBSD: i915_drv.c,v 1.123 2012/09/25 10:19:46 jsg Exp $ */
/*
* Copyright (c) 2008-2009 Owain G. Ainsworth <oga@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*-
* Copyright © 2008 Intel Corporation
* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
* copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* 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, 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
* VA LINUX SYSTEMS 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.
*
* Authors:
* Gareth Hughes <gareth@valinux.com>
* Eric Anholt <eric@anholt.net>
*
*/
#include "drmP.h"
#include "drm.h"
#include "i915_drm.h"
#include "i915_drv.h"
#include <machine/pmap.h>
#include <sys/queue.h>
#include <sys/workq.h>
int
i915_gem_evict_something(struct inteldrm_softc *dev_priv, size_t min_size)
{
struct drm_obj *obj;
struct drm_i915_gem_request *request;
struct drm_i915_gem_object *obj_priv;
struct intel_ring_buffer *ring;
u_int32_t seqno;
int ret = 0, write_domain = 0, i;
int found;
for (;;) {
i915_gem_retire_requests(dev_priv);
/* If there's an inactive buffer available now, grab it
* and be done.
*/
obj = i915_gem_find_inactive_object(dev_priv, min_size);
if (obj != NULL) {
obj_priv = to_intel_bo(obj);
/* find inactive object returns the object with a
* reference for us, and held
*/
KASSERT(obj_priv->pin_count == 0);
KASSERT(!obj_priv->active);
DRM_ASSERT_HELD(obj);
/* Wait on the rendering and unbind the buffer. */
ret = i915_gem_object_unbind(obj_priv);
drm_unhold_and_unref(obj);
return (ret);
}
/* If we didn't get anything, but the ring is still processing
* things, wait for one of those things to finish and hopefully
* leave us a buffer to evict.
*/
found = 0;
for_each_ring(ring, dev_priv, i) {
if (!list_empty(&ring->request_list)) {
request = list_first_entry(&ring->request_list,
struct drm_i915_gem_request, list);
seqno = request->seqno;
ret = i915_wait_seqno(request->ring, seqno);
if (ret)
return (ret);
found = 1;
break;
}
}
if (found)
continue;
/* If we didn't have anything on the request list but there
* are buffers awaiting a flush, emit one and try again.
* When we wait on it, those buffers waiting for that flush
* will get moved to inactive.
*/
list_for_each_entry(obj_priv, &dev_priv->mm.flushing_list,
mm_list) {
obj = &obj_priv->base;
if (obj->size >= min_size) {
write_domain = obj->write_domain;
break;
}
obj = NULL;
}
if (write_domain) {
if (i915_gem_flush_ring(obj_priv->ring, write_domain,
write_domain) == 0)
return (ENOMEM);
continue;
}
/*
* If we didn't do any of the above, there's no single buffer
* large enough to swap out for the new one, so just evict
* everything and start again. (This should be rare.)
*/
if (!list_empty(&dev_priv->mm.inactive_list))
return (i915_gem_evict_inactive(dev_priv));
else
return (i915_gem_evict_everything(dev_priv));
}
/* NOTREACHED */
}
int
i915_gem_evict_everything(struct inteldrm_softc *dev_priv)
{
struct drm_device *dev = (struct drm_device *)dev_priv->drmdev;
int ret;
if (list_empty(&dev_priv->mm.inactive_list) &&
list_empty(&dev_priv->mm.flushing_list) &&
list_empty(&dev_priv->mm.active_list))
return (ENOSPC);
/* The gpu_idle will flush everything in the write domain to the
* active list. Then we must move everything off the active list
* with retire requests.
*/
ret = i915_gpu_idle(dev);
if (ret)
return ret;
i915_gem_retire_requests(dev_priv);
i915_gem_evict_inactive(dev_priv);
/*
* All lists should be empty because we flushed the whole queue, then
* we evicted the whole shebang, only pinned objects are still bound.
*/
KASSERT(list_empty(&dev_priv->mm.inactive_list));
KASSERT(list_empty(&dev_priv->mm.flushing_list));
KASSERT(list_empty(&dev_priv->mm.active_list));
return (0);
}
/* Clear out the inactive list and unbind everything in it. */
int
i915_gem_evict_inactive(struct inteldrm_softc *dev_priv)
{
struct drm_i915_gem_object *obj_priv, *next;
int ret = 0;
list_for_each_entry_safe(obj_priv, next,
&dev_priv->mm.inactive_list, mm_list) {
if (obj_priv->pin_count != 0) {
ret = EINVAL;
DRM_ERROR("Pinned object in unbind list\n");
break;
}
/* reference it so that we can frob it outside the lock */
drm_ref(&obj_priv->base.uobj);
drm_hold_object(&obj_priv->base);
ret = i915_gem_object_unbind(obj_priv);
drm_unhold_and_unref(&obj_priv->base);
if (ret)
break;
}
return (ret);
}
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