forked from Minki/linux
2c4b389518
Doing the check is trivial (low cost in comparison to overall eviction) and helps simplify the code. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161222083641.2691-29-chris@chris-wilson.co.uk
304 lines
8.7 KiB
C
304 lines
8.7 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 <drm/i915_drm.h>
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#include "i915_drv.h"
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#include "intel_drv.h"
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#include "i915_trace.h"
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static bool ggtt_is_idle(struct drm_i915_private *dev_priv)
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{
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struct i915_ggtt *ggtt = &dev_priv->ggtt;
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struct intel_engine_cs *engine;
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enum intel_engine_id id;
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for_each_engine(engine, dev_priv, id) {
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struct intel_timeline *tl;
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tl = &ggtt->base.timeline.engine[engine->id];
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if (i915_gem_active_isset(&tl->last_request))
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return false;
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}
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return true;
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}
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static bool
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mark_free(struct drm_mm_scan *scan,
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struct i915_vma *vma,
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unsigned int flags,
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struct list_head *unwind)
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{
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if (i915_vma_is_pinned(vma))
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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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if (flags & PIN_NONFAULT && !list_empty(&vma->obj->userfault_link))
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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(scan, &vma->node);
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}
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/**
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* i915_gem_evict_something - Evict vmas to make room for binding a new one
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* @vm: address space to evict from
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* @min_size: size of the desired free space
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* @alignment: alignment constraint of the desired free space
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* @cache_level: cache_level for the desired space
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* @start: start (inclusive) of the range from which to evict objects
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* @end: end (exclusive) of the range from which to evict objects
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* @flags: additional flags to control the eviction algorithm
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*
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* This function will try to evict vmas until a free space satisfying the
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* requirements is found. Callers must check first whether any such hole exists
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* already before calling this function.
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*
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* This function is used by the object/vma binding code.
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*
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* Since this function is only used to free up virtual address space it only
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* ignores pinned vmas, and not object where the backing storage itself is
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* pinned. Hence obj->pages_pin_count does not protect against eviction.
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*
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* To clarify: This is for freeing up virtual address space, not for freeing
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* memory in e.g. the shrinker.
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*/
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int
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i915_gem_evict_something(struct i915_address_space *vm,
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u64 min_size, u64 alignment,
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unsigned cache_level,
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u64 start, u64 end,
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unsigned flags)
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{
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struct drm_i915_private *dev_priv = to_i915(vm->dev);
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struct drm_mm_scan scan;
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struct list_head eviction_list;
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struct list_head *phases[] = {
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&vm->inactive_list,
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&vm->active_list,
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NULL,
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}, **phase;
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struct i915_vma *vma, *next;
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int ret;
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lockdep_assert_held(&vm->dev->struct_mutex);
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trace_i915_gem_evict(vm, min_size, alignment, flags);
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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 in flight,
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* on the active list, again in retirement order.
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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. Active objects (will stall on unbinding)
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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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drm_mm_scan_init_with_range(&scan, &vm->mm,
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min_size, alignment, cache_level,
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start, end);
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if (flags & PIN_NONBLOCK)
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phases[1] = NULL;
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search_again:
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INIT_LIST_HEAD(&eviction_list);
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phase = phases;
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do {
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list_for_each_entry(vma, *phase, vm_link)
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if (mark_free(&scan, vma, flags, &eviction_list))
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goto found;
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} while (*++phase);
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/* Nothing found, clean up and bail out! */
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list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
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ret = drm_mm_scan_remove_block(&scan, &vma->node);
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BUG_ON(ret);
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INIT_LIST_HEAD(&vma->exec_list);
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}
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/* Can we unpin some objects such as idle hw contents,
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* or pending flips? But since only the GGTT has global entries
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* such as scanouts, rinbuffers and contexts, we can skip the
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* purge when inspecting per-process local address spaces.
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*/
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if (!i915_is_ggtt(vm) || flags & PIN_NONBLOCK)
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return -ENOSPC;
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if (ggtt_is_idle(dev_priv)) {
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/* If we still have pending pageflip completions, drop
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* back to userspace to give our workqueues time to
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* acquire our locks and unpin the old scanouts.
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*/
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return intel_has_pending_fb_unpin(vm->dev) ? -EAGAIN : -ENOSPC;
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}
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/* Not everything in the GGTT is tracked via vma (otherwise we
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* could evict as required with minimal stalling) so we are forced
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* to idle the GPU and explicitly retire outstanding requests in
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* the hopes that we can then remove contexts and the like only
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* bound by their active reference.
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*/
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ret = i915_gem_switch_to_kernel_context(dev_priv);
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if (ret)
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return ret;
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ret = i915_gem_wait_for_idle(dev_priv,
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I915_WAIT_INTERRUPTIBLE |
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I915_WAIT_LOCKED);
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if (ret)
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return ret;
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i915_gem_retire_requests(dev_priv);
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goto search_again;
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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 and take a reference for all before
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* calling unbind (which may remove the active reference
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* of any of our objects, thus corrupting the list).
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*/
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list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
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if (drm_mm_scan_remove_block(&scan, &vma->node))
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__i915_vma_pin(vma);
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else
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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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vma = list_first_entry(&eviction_list,
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struct i915_vma,
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exec_list);
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list_del_init(&vma->exec_list);
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__i915_vma_unpin(vma);
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if (ret == 0)
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ret = i915_vma_unbind(vma);
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}
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return ret;
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}
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int
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i915_gem_evict_for_vma(struct i915_vma *target)
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{
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struct drm_mm_node *node, *next;
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lockdep_assert_held(&target->vm->dev->struct_mutex);
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list_for_each_entry_safe(node, next,
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&target->vm->mm.head_node.node_list,
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node_list) {
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struct i915_vma *vma;
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int ret;
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if (node->start + node->size <= target->node.start)
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continue;
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if (node->start >= target->node.start + target->node.size)
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break;
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vma = container_of(node, typeof(*vma), node);
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if (i915_vma_is_pinned(vma)) {
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if (!vma->exec_entry || i915_vma_pin_count(vma) > 1)
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/* Object is pinned for some other use */
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return -EBUSY;
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/* We need to evict a buffer in the same batch */
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if (vma->exec_entry->flags & EXEC_OBJECT_PINNED)
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/* Overlapping fixed objects in the same batch */
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return -EINVAL;
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return -ENOSPC;
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}
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ret = i915_vma_unbind(vma);
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if (ret)
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return ret;
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}
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return 0;
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}
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/**
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* i915_gem_evict_vm - Evict all idle vmas from a vm
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* @vm: Address space to cleanse
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* @do_idle: Boolean directing whether to idle first.
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*
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* This function evicts all idles vmas from a vm. If all unpinned vmas should be
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* evicted the @do_idle needs to be set to true.
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*
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* This is used by the execbuf code as a last-ditch effort to defragment the
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* address space.
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*
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* To clarify: This is for freeing up virtual address space, not for freeing
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* memory in e.g. the shrinker.
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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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lockdep_assert_held(&vm->dev->struct_mutex);
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trace_i915_gem_evict_vm(vm);
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if (do_idle) {
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struct drm_i915_private *dev_priv = to_i915(vm->dev);
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if (i915_is_ggtt(vm)) {
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ret = i915_gem_switch_to_kernel_context(dev_priv);
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if (ret)
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return ret;
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}
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ret = i915_gem_wait_for_idle(dev_priv,
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I915_WAIT_INTERRUPTIBLE |
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I915_WAIT_LOCKED);
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if (ret)
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return ret;
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i915_gem_retire_requests(dev_priv);
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WARN_ON(!list_empty(&vm->active_list));
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}
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list_for_each_entry_safe(vma, next, &vm->inactive_list, vm_link)
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if (!i915_vma_is_pinned(vma))
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WARN_ON(i915_vma_unbind(vma));
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return 0;
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}
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