![Ben Widawsky](/assets/img/avatar_default.png)
Tracing vm eviction is really the event we care about. For the cases we evict everything, we still will get the trace. v2: Add the drm device to the trace since we might not be the only device in the system. (Chris) Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Ben Widawsky <ben@bwidawsk.net> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
231 lines
6.7 KiB
C
231 lines
6.7 KiB
C
/*
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* Copyright © 2008-2010 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Eric Anholt <eric@anholt.net>
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* Chris Wilson <chris@chris-wilson.co.uuk>
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*
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*/
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#include <drm/drmP.h>
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#include "i915_drv.h"
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#include <drm/i915_drm.h>
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#include "i915_trace.h"
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static bool
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mark_free(struct i915_vma *vma, struct list_head *unwind)
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{
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if (vma->obj->pin_count)
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return false;
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if (WARN_ON(!list_empty(&vma->exec_list)))
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return false;
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list_add(&vma->exec_list, unwind);
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return drm_mm_scan_add_block(&vma->node);
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}
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int
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i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm,
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int min_size, unsigned alignment, unsigned cache_level,
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bool mappable, bool nonblocking)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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struct list_head eviction_list, unwind_list;
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struct i915_vma *vma;
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int ret = 0;
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trace_i915_gem_evict(dev, min_size, alignment, mappable);
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/*
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* The goal is to evict objects and amalgamate space in LRU order.
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* The oldest idle objects reside on the inactive list, which is in
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* retirement order. The next objects to retire are those on the (per
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* ring) active list that do not have an outstanding flush. Once the
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* hardware reports completion (the seqno is updated after the
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* batchbuffer has been finished) the clean buffer objects would
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* be retired to the inactive list. Any dirty objects would be added
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* to the tail of the flushing list. So after processing the clean
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* active objects we need to emit a MI_FLUSH to retire the flushing
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* list, hence the retirement order of the flushing list is in
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* advance of the dirty objects on the active lists.
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*
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* The retirement sequence is thus:
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* 1. Inactive objects (already retired)
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* 2. Clean active objects
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* 3. Flushing list
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* 4. Dirty active objects.
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*
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* On each list, the oldest objects lie at the HEAD with the freshest
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* object on the TAIL.
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*/
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INIT_LIST_HEAD(&unwind_list);
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if (mappable) {
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BUG_ON(!i915_is_ggtt(vm));
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drm_mm_init_scan_with_range(&vm->mm, min_size,
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alignment, cache_level, 0,
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dev_priv->gtt.mappable_end);
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} else
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drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level);
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/* First see if there is a large enough contiguous idle region... */
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list_for_each_entry(vma, &vm->inactive_list, mm_list) {
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if (mark_free(vma, &unwind_list))
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goto found;
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}
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if (nonblocking)
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goto none;
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/* Now merge in the soon-to-be-expired objects... */
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list_for_each_entry(vma, &vm->active_list, mm_list) {
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if (mark_free(vma, &unwind_list))
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goto found;
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}
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none:
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/* Nothing found, clean up and bail out! */
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while (!list_empty(&unwind_list)) {
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vma = list_first_entry(&unwind_list,
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struct i915_vma,
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exec_list);
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ret = drm_mm_scan_remove_block(&vma->node);
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BUG_ON(ret);
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list_del_init(&vma->exec_list);
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}
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/* We expect the caller to unpin, evict all and try again, or give up.
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* So calling i915_gem_evict_vm() is unnecessary.
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*/
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return -ENOSPC;
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found:
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/* drm_mm doesn't allow any other other operations while
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* scanning, therefore store to be evicted objects on a
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* temporary list. */
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INIT_LIST_HEAD(&eviction_list);
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while (!list_empty(&unwind_list)) {
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vma = list_first_entry(&unwind_list,
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struct i915_vma,
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exec_list);
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if (drm_mm_scan_remove_block(&vma->node)) {
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list_move(&vma->exec_list, &eviction_list);
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drm_gem_object_reference(&vma->obj->base);
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continue;
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}
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list_del_init(&vma->exec_list);
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}
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/* Unbinding will emit any required flushes */
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while (!list_empty(&eviction_list)) {
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struct drm_gem_object *obj;
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vma = list_first_entry(&eviction_list,
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struct i915_vma,
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exec_list);
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obj = &vma->obj->base;
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list_del_init(&vma->exec_list);
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if (ret == 0)
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ret = i915_vma_unbind(vma);
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drm_gem_object_unreference(obj);
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}
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return ret;
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}
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/**
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* i915_gem_evict_vm - Try to free up VM space
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*
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* @vm: Address space to evict from
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* @do_idle: Boolean directing whether to idle first.
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*
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* VM eviction is about freeing up virtual address space. If one wants fine
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* grained eviction, they should see evict something for more details. In terms
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* of freeing up actual system memory, this function may not accomplish the
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* desired result. An object may be shared in multiple address space, and this
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* function will not assert those objects be freed.
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*
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* Using do_idle will result in a more complete eviction because it retires, and
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* inactivates current BOs.
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*/
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int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle)
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{
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struct i915_vma *vma, *next;
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int ret;
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trace_i915_gem_evict_vm(vm);
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if (do_idle) {
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ret = i915_gpu_idle(vm->dev);
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if (ret)
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return ret;
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i915_gem_retire_requests(vm->dev);
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}
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list_for_each_entry_safe(vma, next, &vm->inactive_list, mm_list)
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if (vma->obj->pin_count == 0)
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WARN_ON(i915_vma_unbind(vma));
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return 0;
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}
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int
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i915_gem_evict_everything(struct drm_device *dev)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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struct i915_address_space *vm;
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bool lists_empty = true;
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int ret;
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list_for_each_entry(vm, &dev_priv->vm_list, global_link) {
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lists_empty = (list_empty(&vm->inactive_list) &&
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list_empty(&vm->active_list));
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if (!lists_empty)
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lists_empty = false;
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}
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if (lists_empty)
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return -ENOSPC;
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trace_i915_gem_evict_everything(dev);
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/* The gpu_idle will flush everything in the write domain to the
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* active list. Then we must move everything off the active list
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* with retire requests.
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*/
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ret = i915_gpu_idle(dev);
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if (ret)
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return ret;
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i915_gem_retire_requests(dev);
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/* Having flushed everything, unbind() should never raise an error */
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list_for_each_entry(vm, &dev_priv->vm_list, global_link)
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WARN_ON(i915_gem_evict_vm(vm, false));
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return 0;
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}
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