1235783Skib/* 2235783Skib * Copyright �� 2008-2010 Intel Corporation 3235783Skib * 4235783Skib * Permission is hereby granted, free of charge, to any person obtaining a 5235783Skib * copy of this software and associated documentation files (the "Software"), 6235783Skib * to deal in the Software without restriction, including without limitation 7235783Skib * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8235783Skib * and/or sell copies of the Software, and to permit persons to whom the 9235783Skib * Software is furnished to do so, subject to the following conditions: 10235783Skib * 11235783Skib * The above copyright notice and this permission notice (including the next 12235783Skib * paragraph) shall be included in all copies or substantial portions of the 13235783Skib * Software. 14235783Skib * 15235783Skib * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16235783Skib * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17235783Skib * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18235783Skib * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19235783Skib * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20235783Skib * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21235783Skib * IN THE SOFTWARE. 22235783Skib * 23235783Skib * Authors: 24235783Skib * Eric Anholt <eric@anholt.net> 25235783Skib * Chris Wilson <chris@chris-wilson.co.uuk> 26235783Skib * 27235783Skib */ 28235783Skib 29235783Skib#include <sys/cdefs.h> 30235783Skib__FBSDID("$FreeBSD$"); 31235783Skib 32235783Skib#include <dev/drm2/drmP.h> 33296548Sdumbbell#include <dev/drm2/i915/i915_drv.h> 34235783Skib#include <dev/drm2/i915/i915_drm.h> 35235783Skib 36235783Skibstatic bool 37235783Skibmark_free(struct drm_i915_gem_object *obj, struct list_head *unwind) 38235783Skib{ 39277487Skib if (obj->pin_count) 40277487Skib return false; 41277487Skib 42235783Skib list_add(&obj->exec_list, unwind); 43235783Skib return drm_mm_scan_add_block(obj->gtt_space); 44235783Skib} 45235783Skib 46235783Skibint 47235783Skibi915_gem_evict_something(struct drm_device *dev, int min_size, 48296548Sdumbbell unsigned alignment, unsigned cache_level, 49296548Sdumbbell bool mappable, bool nonblocking) 50235783Skib{ 51235783Skib drm_i915_private_t *dev_priv = dev->dev_private; 52235783Skib struct list_head eviction_list, unwind_list; 53235783Skib struct drm_i915_gem_object *obj; 54235783Skib int ret = 0; 55235783Skib 56235783Skib CTR4(KTR_DRM, "evict_something %p %d %u %d", dev, min_size, 57235783Skib alignment, mappable); 58235783Skib 59235783Skib /* 60235783Skib * The goal is to evict objects and amalgamate space in LRU order. 61235783Skib * The oldest idle objects reside on the inactive list, which is in 62235783Skib * retirement order. The next objects to retire are those on the (per 63235783Skib * ring) active list that do not have an outstanding flush. Once the 64235783Skib * hardware reports completion (the seqno is updated after the 65235783Skib * batchbuffer has been finished) the clean buffer objects would 66235783Skib * be retired to the inactive list. Any dirty objects would be added 67235783Skib * to the tail of the flushing list. So after processing the clean 68235783Skib * active objects we need to emit a MI_FLUSH to retire the flushing 69235783Skib * list, hence the retirement order of the flushing list is in 70235783Skib * advance of the dirty objects on the active lists. 71235783Skib * 72235783Skib * The retirement sequence is thus: 73235783Skib * 1. Inactive objects (already retired) 74235783Skib * 2. Clean active objects 75235783Skib * 3. Flushing list 76235783Skib * 4. Dirty active objects. 77235783Skib * 78235783Skib * On each list, the oldest objects lie at the HEAD with the freshest 79235783Skib * object on the TAIL. 80235783Skib */ 81235783Skib 82235783Skib INIT_LIST_HEAD(&unwind_list); 83235783Skib if (mappable) 84296548Sdumbbell drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, 85296548Sdumbbell min_size, alignment, cache_level, 86296548Sdumbbell 0, dev_priv->mm.gtt_mappable_end); 87235783Skib else 88296548Sdumbbell drm_mm_init_scan(&dev_priv->mm.gtt_space, 89296548Sdumbbell min_size, alignment, cache_level); 90235783Skib 91235783Skib /* First see if there is a large enough contiguous idle region... */ 92235783Skib list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) { 93235783Skib if (mark_free(obj, &unwind_list)) 94235783Skib goto found; 95235783Skib } 96235783Skib 97296548Sdumbbell if (nonblocking) 98296548Sdumbbell goto none; 99296548Sdumbbell 100235783Skib /* Now merge in the soon-to-be-expired objects... */ 101235783Skib list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) { 102235783Skib if (mark_free(obj, &unwind_list)) 103235783Skib goto found; 104235783Skib } 105235783Skib 106296548Sdumbbellnone: 107235783Skib /* Nothing found, clean up and bail out! */ 108235783Skib while (!list_empty(&unwind_list)) { 109235783Skib obj = list_first_entry(&unwind_list, 110235783Skib struct drm_i915_gem_object, 111235783Skib exec_list); 112235783Skib 113235783Skib ret = drm_mm_scan_remove_block(obj->gtt_space); 114296548Sdumbbell BUG_ON(ret); 115235783Skib 116235783Skib list_del_init(&obj->exec_list); 117235783Skib } 118235783Skib 119235783Skib /* We expect the caller to unpin, evict all and try again, or give up. 120235783Skib * So calling i915_gem_evict_everything() is unnecessary. 121235783Skib */ 122235783Skib return -ENOSPC; 123235783Skib 124235783Skibfound: 125235783Skib /* drm_mm doesn't allow any other other operations while 126235783Skib * scanning, therefore store to be evicted objects on a 127235783Skib * temporary list. */ 128235783Skib INIT_LIST_HEAD(&eviction_list); 129235783Skib while (!list_empty(&unwind_list)) { 130235783Skib obj = list_first_entry(&unwind_list, 131235783Skib struct drm_i915_gem_object, 132235783Skib exec_list); 133235783Skib if (drm_mm_scan_remove_block(obj->gtt_space)) { 134235783Skib list_move(&obj->exec_list, &eviction_list); 135235783Skib drm_gem_object_reference(&obj->base); 136235783Skib continue; 137235783Skib } 138235783Skib list_del_init(&obj->exec_list); 139235783Skib } 140235783Skib 141235783Skib /* Unbinding will emit any required flushes */ 142235783Skib while (!list_empty(&eviction_list)) { 143235783Skib obj = list_first_entry(&eviction_list, 144235783Skib struct drm_i915_gem_object, 145235783Skib exec_list); 146235783Skib if (ret == 0) 147235783Skib ret = i915_gem_object_unbind(obj); 148235783Skib 149235783Skib list_del_init(&obj->exec_list); 150235783Skib drm_gem_object_unreference(&obj->base); 151235783Skib } 152235783Skib 153235783Skib return ret; 154235783Skib} 155235783Skib 156235783Skibint 157296548Sdumbbelli915_gem_evict_everything(struct drm_device *dev) 158235783Skib{ 159235783Skib drm_i915_private_t *dev_priv = dev->dev_private; 160277487Skib struct drm_i915_gem_object *obj, *next; 161277487Skib bool lists_empty; 162235783Skib int ret; 163235783Skib 164235783Skib lists_empty = (list_empty(&dev_priv->mm.inactive_list) && 165235783Skib list_empty(&dev_priv->mm.active_list)); 166235783Skib if (lists_empty) 167235783Skib return -ENOSPC; 168235783Skib 169296548Sdumbbell CTR1(KTR_DRM, "evict_everything %p", dev); 170235783Skib 171277487Skib /* The gpu_idle will flush everything in the write domain to the 172277487Skib * active list. Then we must move everything off the active list 173277487Skib * with retire requests. 174277487Skib */ 175277487Skib ret = i915_gpu_idle(dev); 176235783Skib if (ret) 177235783Skib return ret; 178235783Skib 179277487Skib i915_gem_retire_requests(dev); 180277487Skib 181277487Skib /* Having flushed everything, unbind() should never raise an error */ 182235783Skib list_for_each_entry_safe(obj, next, 183296548Sdumbbell &dev_priv->mm.inactive_list, mm_list) 184296548Sdumbbell if (obj->pin_count == 0) 185296548Sdumbbell WARN_ON(i915_gem_object_unbind(obj)); 186235783Skib 187235783Skib return 0; 188235783Skib} 189